JP6507390B2 - Hydraulic solidifying material liquid displacement column construction device and hydraulic solidifying material liquid displacement column construction method - Google Patents

Hydraulic solidifying material liquid displacement column construction device and hydraulic solidifying material liquid displacement column construction method Download PDF

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JP6507390B2
JP6507390B2 JP2015041056A JP2015041056A JP6507390B2 JP 6507390 B2 JP6507390 B2 JP 6507390B2 JP 2015041056 A JP2015041056 A JP 2015041056A JP 2015041056 A JP2015041056 A JP 2015041056A JP 6507390 B2 JP6507390 B2 JP 6507390B2
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solidifying material
hydraulic solidifying
cylindrical body
liquid displacement
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JP2016160668A (en
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堀切　節
節 堀切
村山　篤史
篤史 村山
俊則 藤橋
俊則 藤橋
啓三 田中
啓三 田中
吉田　茂
茂 吉田
雄治 柳田
雄治 柳田
吉田　茂樹
茂樹 吉田
大和　真一
真一 大和
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Tenox Corp
Japan Inspection Organization Corp JIO
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本発明は、戸建住宅等の小規模建築物や土間スラブ当の比較的軽微な構造物の基礎工法に使用される水硬性固化材液置換コラム築造装置及び水硬性固化材液置換コラム築造方法に関する。 The present invention relates to a hydraulic solidifying material liquid displacement column construction apparatus and hydraulic solidifying material liquid displacement column construction method used for foundation methods of small scale buildings such as detached houses etc. and relatively minor structures of soil slabs. about the law.

戸建住宅や土間スラブの基礎工法として、深層混合処理工法による柱状改良工法（以下、「コラム工法」という）が広く採用されている。しかしながら、コラム工法は原位置の地盤土とセメントスラリーを攪拌混合するため、粘着力の高い粘性土を対象とする場合に共回り現象が発生して混合不良による品質不良が発生したり、有機質土などの地盤の種別によっては固化不良を発生したりするという問題があった。また、事前の地盤調査では発見できなかった想定外土質が出現することがあり、常に品質不良が発生する危険が付きまとっている。   A pillar improvement method (hereinafter referred to as "column method") by deep mixing method is widely adopted as a foundation method for detached houses and soil slabs. However, since the column method stirs and mixes the in-situ ground soil and the cement slurry, the co-rotation phenomenon occurs when the cohesive soil with high adhesive strength is targeted, causing poor quality due to poor mixing, or organic soil Depending on the type of ground such as, there is a problem that solidification failure occurs. In addition, unexpected soil quality that could not be found in the ground survey in advance may appear, and there is always a risk of poor quality.

この問題を解決するための先行技術として、水硬性固化材液置換コラムの築造方法および水硬性固化材液置換コラムの施工装置（特許文献１参照）が提案されている。そもそも、地盤土と水硬性固化材液を攪拌混合して築造するソイルセメントの混合不良や固化不良などの品質不良を引き起こす原因が水硬性固化材液と原位置の地盤土とを攪拌混合することにあることに鑑み、該先行技術は地盤土と水硬性固化材液を攪拌混合せずに、水硬性固化材液単味で柱状体を築造するものである。したがって、築造された水硬性固化材液置換コラムは周辺の原位置土が混合されないため高強度・高品質であり、かつ周辺の原位置土が仮に有機質土であっても固化不良が生じず、土質に左右されることなく高強度・高品質を発揮することができる。   As prior art for solving this problem, a method of constructing a hydraulic solidifying agent liquid displacement column and a construction apparatus of the hydraulic solidifying agent liquid displacement column have been proposed (see Patent Document 1). In the first place, agitation and mixing of the hydraulic solidifying material solution and the in-situ soil is the cause that causes poor quality such as mixing failure and solidification failure of the soil cement which is built by stirring and mixing the ground soil and the hydraulic solidifying material solution. In view of the above, in the prior art, a columnar body is constructed with a hydraulic solidifying agent liquid alone without stirring and mixing the ground soil and the hydraulic solidifying agent liquid. Therefore, the built-up hydraulic solidified material liquid displacement column has high strength and high quality because the surrounding in-situ soil is not mixed, and solidification failure does not occur even if the surrounding in-situ soil is an organic soil, High strength and high quality can be exhibited regardless of the soil quality.

また、特許文献１の技術に関する改良技術として、水硬性固化材液置換コラム築造用掘削ロッドの掘削ヘッド及び掘削装置（特許文献２参照）が提案されている。この技術は側面に螺旋状の翼を設けた円錐状の掘削ヘッドを用いることにより掘進性能を大幅に向上させることができる。また、一枚爪型の掘削ヘッドでは回転掘進時に爪部に付着する土塊が必然的に発生するが、円錐状掘削ヘッドではそのヘッドに付着する土砂量を劇的に減少させ、さらに掘削ロッド引上げ時の付着土砂の落下防止機能を付与したものである。   Moreover, as an improvement technique regarding the technique of patent document 1, the drilling head and drilling apparatus (refer patent document 2) of the drilling rod for hydraulic-solidification-material liquid substitution column construction are proposed. This technique can significantly improve drilling performance by using a conical drilling head with helical wings on the sides. In addition, although a single-claw type drilling head inevitably generates soil lumps attached to the claws during rotary digging, a conical drilling head dramatically reduces the amount of sediment attached to the head and further raises the drilling rod It has a function to prevent the fall of the adhering soil at that time.

特許文献２の施工手順は図３７に示すように、（ａ）側面にスパイラル状の翼３２ａと水硬性固化材液の吐出口３２ｂを有する円錐状の掘削ヘッド３２を下端に接続した排土機構のない掘削ロッド３１ａからなる水硬性固化材液置換コラム築造装置３１を施工機（図示せず）に装着し、掘削ヘッド３２先端中心部を杭心位置にセットする。（ｂ）掘削ロッド３１ａを正回転させながら掘進する。このとき、掘削ヘッド３２にある吐出口３２ｂからの水硬性固化材液の吐出は必須ではない。（ｃ）所定の掘進深度が掘削ロッド長よりも浅い場合は、掘削ロッド３１ａの上方の一部が地上にある状態で掘進を停止する。（ｄ）所定の掘進深度が掘削ロッド３１ａの長さよりも深い場合は接続ロッド３１ｂの一部が地中に貫入する状態になるまで掘進して、所定深度位置で停止する。所定深度がさらに深い場合は接続ロッド３１ｂを継ぎ足す場合もある。（ｅ）その後、掘削ヘッド３２にある吐出口３２ｂから水硬性固化材液３５を吐出しながら、掘削ロッド３１ａを正回転の状態で引上げる。このとき、掘削ロッド３１ａの引上げ速度と水硬性固化材液の吐出量を調整して、掘削ロッド３１ａの引上げに伴う負圧発生がないようにする。なお、このときの掘削ロッド３１ａの回転方向は逆回転でもよいが、掘削ヘッド３２の付着土砂はわずかではあるがスパイラル状翼３２ａで支えられているので、この掘削ヘッド３２の付着土砂の落下を防止するためには、正回転の方が好ましい。（ｆ）掘削ロッド３１ａを地上まで引上げて、水硬性固化材液３５の量を調整して、水硬性固化材液３５を所定の深度位置まで填充する、というものである。   As shown in FIG. 37, in the construction procedure of Patent Document 2, (a) a soil removing mechanism in which a conical excavating head 32 having a spiral wing 32a and a discharge port 32b of hydraulic solidifying material solution on the side is connected to the lower end. A hydraulic solidifying material liquid displacement column construction device 31 consisting of a drilling rod 31a without a screw is mounted on a construction machine (not shown), and the tip center portion of the drilling head 32 is set at a pile center position. (B) Excavating while rotating the drilling rod 31a forward. At this time, the discharge of the hydraulic solidifying material solution from the discharge port 32b in the drilling head 32 is not essential. (C) When the predetermined drilling depth is shallower than the drilling rod length, the drilling is stopped with a part of the upper portion of the drilling rod 31a on the ground. (D) If the predetermined drilling depth is deeper than the length of the drilling rod 31a, drilling is performed until a part of the connecting rod 31b penetrates into the ground, and stops at the predetermined depth position. When the predetermined depth is deeper, the connection rod 31b may be added. (E) Thereafter, while discharging the hydraulic solidified material liquid 35 from the discharge port 32b in the drilling head 32, the drilling rod 31a is pulled up in a state of normal rotation. At this time, the pulling speed of the drilling rod 31a and the discharge amount of the hydraulic solidifying material solution are adjusted to prevent the generation of negative pressure accompanying pulling of the drilling rod 31a. At this time, the direction of rotation of the drilling rod 31a may be reverse rotation, but the deposited soil on the drilling head 32 is supported by the spiral wing 32a although it is slight, so that the deposited soil on the drilling head 32 In order to prevent this, positive rotation is preferable. (F) The digging rod 31a is pulled up to the ground to adjust the amount of the hydraulic solidifying agent liquid 35, and the hydraulic solidifying agent liquid 35 is filled to a predetermined depth position.

特開２０１１−１０６２５３JP 2011-106253 A 特開２０１３−２３４５５７JP 2013-234557

先行技術による水硬性固化材液置換コラムは、掘削ロッドを地中に強制的に貫入させることにより地盤を側方に強制変位させ、その後、周辺地盤孔壁を掘削ロッドにより練り付けるため、築造される置換コラムの形状が円柱状に形成されるものである。この施工原理から、水硬性固化材液置換コラムは鉛直支持力において周面摩擦力が大きいという特徴を有している。しかしながら、水硬性固化材液置換コラムの主たる用途が戸建住宅等の小規模建築物や土間スラブの基礎などの小規模構造物であり、そのため水硬性固化材液置換コラムの施工機には施工能力（掘進トルク、押込み力）が比較的小さな小型機械を想定しており、また、掘削ロッドにより地盤を側方に強制変位させるという施工原理であるため、置換コラムの外径を単純に大きくすることは掘削時の地盤抵抗が施工機の掘進能力を超えてしまう場合が容易に想定できるので実質的に困難であった。したがって、実際の施工においてはその外径は２００ｍｍ程度（実際には鋼管規格の外径２１６．３ｍｍ）が最も多く実施されている。外径の上限値は地盤条件などの施工条件によるが３００ｍｍ程度（実際には鋼管規格の外径３１８．５ｍｍ）以下と推察される。そのような理由から、築造径を大径化させて、置換コラム１本当りの鉛直支持力をさらに向上させる方法は施工的に実施困難であった。   The hydraulic solidifying material liquid displacement column according to the prior art is constructed in order to forcibly displace the ground laterally by forcing the drilling rod into the ground, and then to knead the surrounding ground hole wall with the drilling rod. The shape of the substituted column is formed in a cylindrical shape. From this construction principle, the hydraulic solidifying agent liquid displacement column is characterized in that the circumferential surface frictional force is large in the vertical supporting force. However, the main use of hydraulic solidifying material liquid displacement columns is small scale buildings such as small-scale buildings such as single-family houses and foundations of soil slabs, and therefore construction is carried out for construction machines for hydraulic solidifying material liquid substitution columns Since the construction principle is based on the assumption that the capacity (digging torque, pushing force) is relatively small and the ground is forcibly displaced laterally by the digging rod, the outer diameter of the replacement column is simply increased. It was practically difficult because it can be easily assumed that the ground resistance at the time of excavation would exceed the drilling capacity of the construction machine. Therefore, in actual construction, the outer diameter is about 200 mm (actually, the outer diameter 216.3 mm of the steel pipe standard) is implemented most frequently. The upper limit of the outer diameter is estimated to be about 300 mm or less (actually, the outer diameter 318.5 mm of the steel pipe standard) or less depending on the construction conditions such as the ground conditions. From such a reason, the method of making the diameter of build-up large and further improving the vertical bearing capacity per one replacement column was difficult in implementation.

また、比較的軟弱な支持層に支持させる戸建住宅等の基礎として水硬性固化材液置換コラムを使用する場合、その鉛直支持力の内訳は先端支持力よりも周面摩擦力が卓越するという現実がある中では、水硬性固化材液置換コラムの大径化は、鉛直支持力は算術級数的に増加するのに対して、水硬性固化材液の使用量は幾何級数的に増加することから、コストパフォーマンスが低下するため、コスト的に問題があった。つまり、水硬性固化材液置換コラムの大径化による鉛直支持力の増大化は、施工的にも経済的にも困難であった。   In addition, when hydraulic solidifying material liquid displacement column is used as a foundation of a detached house etc. supported by a relatively soft supporting layer, the breakdown of the vertical supporting force is that the circumferential surface friction force is superior to the tip supporting force. Under the reality, the diameter increase of hydraulic solidifying material liquid displacement column means that the amount of hydraulic solidifying liquid increases geometrically while the vertical bearing force increases arithmetically. There is a problem in cost because the cost performance is reduced. That is, the increase in the vertical supporting force due to the increase in diameter of the hydraulic solidifying material liquid displacement column is difficult both in construction and in economics.

また、先行技術による水硬性固化材液置換コラムの鉛直支持力は、その単位面積あたりの周面支持力は比較的大きいものの、築造径が２００ｍｍ程度と小さいため、水硬性固化材液置換コラム１本当りの鉛直支持力が小さいという問題があった。そのため、築造径が５００〜６００ｍｍと比較的大きなコラム工法に比べて、同一長の水硬性固化材液置換コラムでは打設本数が増大するし、水硬性固化材液置換コラムをコラム工法と同一本数にするには１本当りの鉛直支持力を大きくするために築造長を相対的に長くする必要があった。したがって、水硬性固化材液置換コラムを採用すると、従来のコラム工法に比べてコストが高い場合があるという問題があった。   In addition, although the vertical support force of the hydraulic solidifying material liquid displacement column according to the prior art has a relatively large circumferential surface supporting power per unit area, but the build diameter is as small as about 200 mm, the hydraulic solidifying material liquid substitution column 1 There was a problem that the vertical bearing capacity per unit was small. Therefore, compared with a relatively large column method with a diameter of 500 to 600 mm, the number of casts increases for the hydraulic solidifying material liquid displacement column of the same length, and the number of hydraulic solidifying material liquid substitution columns is the same as the column method. In order to achieve this, it was necessary to make the construction length relatively long in order to increase the vertical bearing capacity per rod. Therefore, there has been a problem that the use of a hydraulic solidifying agent liquid displacement column may result in higher cost than the conventional column method.

本発明は、このような点に鑑み前記課題を解決すべきなされたものであり、その目的と
するところは、施工手順の大幅な変更をすることなく、また、コストパフォーマンスを維持し、しかも水硬性固化材液置換コラムの高強度・高品質を安定して発揮するという特徴を維持したまま、コラム外周側面に縦方向の突条部を一体に形成して、地盤による水硬性固化材液置換コラムの鉛直支持力を増大可能にする水硬性固化材液置換コラム築造装置及び水硬性固化材液置換コラム築造方法を提供することにある。 The present invention has been made to solve the above-mentioned problems in view of these points, and the object of the present invention is to maintain cost performance without significantly changing the construction procedure, and to use water. While maintaining the characteristics of stably achieving high strength and high quality of the rigid solidified material liquid displacement column, the ridges in the longitudinal direction are integrally formed on the outer peripheral side surface of the column, and the hydraulic solidified material liquid replacement by the ground and to provide a hydraulic solidifying material liquid replacement column construction apparatus and hydraulic solidifying material liquid replacement column construction how to enable increasing the vertical supporting force of the column.

前記目的達成のために、本発明の請求項１に係る水硬性固化材液置換コラム築造装置は、水硬性固化材液の流路を有する掘削ロッド下端部に、その流路に通じる吐出口を有する掘削ヘッドを接続した水硬性固化材液置換コラム築造装置であって、前記掘削ロッド下方部周側面に、回転径が該掘削ロッド径よりも大きな突出体を有する円筒体を、該掘削ロッドに回転可能に遊嵌させたことを特徴とする。   In order to achieve the above object, in the hydraulic solidifying material liquid displacement column construction apparatus according to claim 1 of the present invention, the lower end portion of the digging rod having a flow path of hydraulic solidifying material liquid has a discharge port communicating with the flow path A hydraulic solidifying material liquid displacement column construction apparatus having a drilling head connected thereto, wherein a cylindrical body having a protrusion whose rotation diameter is larger than the drilling rod diameter on the circumferential side surface of the lower portion of the drilling rod is the drilling rod It is characterized in that it is rotatably fitted loosely.

この構成により、円筒体は掘削ロッドに遊嵌され掘削ロッドに対し回転自在であり、しかも円筒体の突出体の回転径は、掘削ロッド径より大きいため、施工機により掘削ロッドを回転しつつ地盤中に掘進して削孔すると、円筒体の突出体は、掘削ロッドで削孔した削孔壁面より外側の地盤内に食い込み掘進する。この時、掘削ロッドに遊嵌されている円筒体には掘削ロッドの回転力は伝わらず、突出体が削孔壁面より外側の地盤内に食い込み回転が阻止されるので、掘削ロッドが回転しても回転せずに掘進する。これにより円筒体の突出体が削孔壁面より外側の地盤内に食い込み掘進した削孔壁面には突出体が食い込んで通過した軌跡部分に突出体の形状に対応した軌跡空間として凹条が形成される。掘削ロッド引き上げ時に、突出体が掘進時の軌跡中を通過すれば凹条孔壁は再び練り付けられてより強固になるし、新たな軌跡の凹条を形成すれば、形成直後に水硬性固化材液が凹条に填充されるので確実に突条部が形成されるのみならず、掘進時に形成された凹条にも水硬性固化材液が填充されるため、硬化後の突条部数が増加して、これに伴い置換コラムの鉛直支持力も増大する。従って、掘削ロッドを所定深度まで掘進した後、掘削ヘッドの吐出口より水硬性固化材液を吐出しつつ掘削ロッドを回転して又は無回転で引き上げて削孔内に水硬性固化材液を填充すると、凹条にも水硬性固化材液が充填されるので、水硬性固化材液が固化すると、コラム外周側面に縦方向の突条部が一体に形成された水硬性固化材液置換コラムが築造される。要するに、外周側面に縦方向の突条部を有する鉛直支持力の高い水硬性固化材液置換コラムが築造されることになる。
円筒体の突出体は、単数でも複数でもよいが、複数だと削孔内壁面に形成される凹条も複数になるので、築造される水硬性固化材液置換コラムの外周面に形成される突条部も複数となり、それだけ周面摩擦力も増大し、鉛直支持力が高くなるので好ましい。しかし、多すぎると地盤による掘進抵抗が増大し施工不能に陥るのみならず、たとえ掘進できたとしても引き上げ時に周辺地盤を乱してしまうため、突出体の通過した軌跡空間で形成する良好な凹条が形成できなく、結果、水硬性固化材液置換コラムの外周にも良好な突条部も形成できない。突出体は、その突出長が掘削ロッド径Ｄ以下、好ましくはＤ／２以下として、その固設数は少なくとも２枚以上多くとも８枚程度、好ましくは３枚〜６枚程度がよい。 With this configuration, the cylindrical body is loosely fitted to the drilling rod and is rotatable with respect to the drilling rod, and the diameter of rotation of the projection of the cylindrical body is larger than the diameter of the drilling rod. When a hole is drilled inward, the projection of the cylindrical body bites into the ground outside the wall surface of the hole drilled by the drilling rod. At this time, the rotational force of the drilling rod is not transmitted to the cylindrical body loosely fitted to the drilling rod, and the protrusion bites into the ground outside the drilling wall surface and rotation is blocked, so the drilling rod rotates. I will dig without turning. As a result, a concave line is formed as a track space corresponding to the shape of the protrusion in the portion where the protrusion bites into and passes through the drilling wall surface where the protrusion of the cylindrical body bites into the ground outside the drilling wall surface and digs forward Ru. When pulling up the drilling rod, if the projection passes through the track during digging, the recessed hole wall is rekneaded and strengthened more strongly, and if a new track of recessed track is formed, hydraulic setting immediately after formation Since the liquid material is filled into the concaves, not only the ridges are surely formed, but also the concaves formed during drilling are filled with the hydraulic solidifying material liquid. Along with this, the vertical bearing capacity of the displacement column also increases. Therefore, after the drilling rod is drilled to a predetermined depth, the drilling rod is rotated while discharging the hydraulic solidifying material solution from the discharge port of the drilling head or pulled up without rotation so that the hydraulic solidifying material solution is filled in the hole. Then, since the recess is filled with the hydraulic solidifying agent liquid, when the hydraulic solidifying agent liquid solidifies, the hydraulic solidifying agent liquid displacement column in which the protruding portion in the longitudinal direction is integrally formed on the outer peripheral side of the column It is built. In short, a hydraulic solidifying material liquid displacement column having a high vertical supporting force, which has the ridges in the longitudinal direction on the outer peripheral side, is constructed.
The number of projections of the cylinder may be single or plural, but if it is plural, the number of concaves formed in the inner wall surface of the hole is also plural, so it is formed on the outer peripheral surface of the hydraulic solidifying material liquid displacement column to be built It is preferable that the number of the protruding portions is also plural, the circumferential surface friction force is increased accordingly, and the vertical supporting force is increased. However, if the amount is too large, not only the resistance to digging due to the ground increases and it becomes impossible to construct but also the surrounding ground is disturbed at the time of pulling up even if digging can take place. As a result, no streaks can be formed, and as a result, good ridges can not be formed on the outer periphery of the hydraulically solidified material liquid displacement column. The protrusion should have a length of at least two and at most eight, preferably at least three to six, with the protrusion length being equal to or less than the digging rod diameter D, preferably D / 2 or less.

また、本発明の請求項２に係る水硬性固化材液置換コラム築造装置は、前記円筒体の突出体が、板状の突片で形成されていることを特徴とする。   Further, in the hydraulic / solidifying material liquid displacement column construction apparatus according to claim 2 of the present invention, the projection of the cylindrical body is formed of a plate-like projection.

この構成により、突出体が板状の突片であるので、突条体貫入時の地盤の掘進抵抗が少なくなるので、地盤中への掘進が容易となり好ましい。従って、円筒体に複数（例えば、円筒体の対称位置に）を設けても、掘進抵抗の増加も少ないので、複数を設けることができる。   With this configuration, since the protrusion is a plate-like protrusion, the resistance to digging of the ground at the time of protrusion of the ridge is reduced, which facilitates digging into the ground, which is preferable. Therefore, even if the cylindrical body is provided with a plurality (for example, at symmetrical positions of the cylinder), the increase in the digging resistance is also small, so a plurality can be provided.

また、本発明の請求項３に係る水硬性固化材液置換コラム築造装置は、前記円筒体が少なくとも２分割可能であり、前記掘削ロッドに対して着脱可能に形成されていることを特徴とする。   In the hydraulic solidifying material liquid displacement column construction apparatus according to a third aspect of the present invention, the cylindrical body can be divided into at least two parts, and is formed detachably with respect to the digging rod. .

この構成により、円筒体は掘削ロッドへの着脱が容易になる。従って、前記突出体のサイズや形状が異なる円筒体を選択して掘削ロッドに対し付け替えが自在かつ容易となり、これにより必要とする所定の鉛直支持力が得られる突条部を持つ水硬性固化材液置換コラムを容易に築造することができる。また、円筒体の突出体が摩耗したり破損した時にも、取り替えが容易となる。   By this configuration, the cylindrical body can be easily attached to and removed from the digging rod. Therefore, a hydraulic solidifying material having a ridge portion which makes it possible to easily and easily replace cylindrical rods having different sizes and shapes of the above-mentioned protrusions and to obtain a predetermined vertical support force required. Liquid displacement columns can be easily built. In addition, when the protrusion of the cylindrical body is worn or broken, replacement is easy.

また、本発明の請求項４に係る水硬性固化材液置換コラム築造装置は、前記円筒体が、少なくとも２分割された分割片で形成され、該分割片は端部にフランジを備え、該フランジ同士を連結して組み立て可能であることを特徴とする。
この構成により、円筒体は、分割片の状態で掘削ロッドに宛がい、各分割片のフランジ同士を連結することで、掘削ロッドに着脱可能に取り付けることができる。従って、掘削ロッドに対する円筒体の取り付け、取り外しが容易にでき、例えば、円筒体の付け替え作業も容易に実施できる。フランジ同士の連結は、例えば、ボルト・ナットなどの締結部材を挙げることができる。 In the hydraulic solidifying material liquid displacement column construction apparatus according to claim 4 of the present invention, the cylindrical body is formed of at least two divided pieces, and the divided pieces are provided with a flange at an end, and the flange It is characterized in that they can be assembled by connecting them.
With this configuration, the cylindrical body can be attached to the digging rod in the state of the split pieces, and can be detachably attached to the digging rod by connecting the flanges of the split pieces. Accordingly, attachment and removal of the cylinder to the drilling rod can be facilitated, and for example, replacement work of the cylinder can also be easily performed. Connection of flanges can mention fastening members, such as a bolt and a nut, for example.

また、本発明の請求項５に係る水硬性固化材液置換コラム築造装置は、前記分割片のフランジ同士を連結して円筒体に組み立てた該フランジを円筒体の突出体とすることを特徴とする。
この構成により、分割片を連結し円筒体に組み立てるフランジを、円筒体の突出体とすることができるので、円筒体に別途突出体を設ける必要がなく、製造が容易となり、安価に提供できる。勿論、このフランジとは別に突出体を設けてもよい。 In the hydraulic solidifying material liquid displacement column construction apparatus according to claim 5 of the present invention, the flanges of the divided pieces are connected to each other and the flanges assembled into a cylindrical body are used as the projecting body of the cylindrical body. Do.
According to this configuration, the flanges which connect the divided pieces and assemble them into the cylindrical body can be formed as a projecting body of the cylindrical body. Therefore, it is not necessary to separately provide the cylindrical body with a projecting body, and the manufacturing becomes easy and inexpensive. Of course, a protrusion may be provided separately from this flange.

また、本発明の請求項６に係る水硬性固化材液置換コラム築造装置は、前記掘削ロッドに前記円筒体の軸方向移動を規制するずれ止めが設けられていることを特徴とする。   The hydraulic solidifying material liquid displacement column construction apparatus according to claim 6 of the present invention is characterized in that the digging rod is provided with a slip stopper for restricting the axial movement of the cylindrical body.

この構成により、掘削ロッドによる地盤の掘進中および引き上げ中に、円筒体が周辺地盤との摩擦抵抗を受けて掘削ロッドの軸の上下方向に移動しようとしても規制され、掘削ロッドとともに円筒体を地盤中に確実に掘進させることができ、結果的に円筒体の突出体形状、サイズに応じた突条部を水硬性固化材液置換コラムに確実に形成できる。   With this configuration, the cylindrical body is restricted even if it moves in the vertical direction of the axis of the drilling rod under frictional resistance with the surrounding ground during digging and pulling up of the ground by the drilling rod, and the cylindrical body is ground with the digging rod It is possible to reliably dig in, and as a result, it is possible to reliably form the ridge portion corresponding to the shape and size of the protrusion of the cylindrical body in the hydraulic solidified material liquid displacement column.

また、本発明の請求項７に係る水硬性固化材液置換コラム築造装置は、突出体を有する円筒体を回転可能に遊嵌させた位置より下方部分の掘削ロッド径が径小となっていることを特徴とする。   In the hydraulic solidifying material liquid displacement column construction apparatus according to claim 7 of the present invention, the diameter of the digging rod in the lower portion is smaller than the position where the cylindrical body having the projecting body is loosely fitted rotatably. It is characterized by

この構成により、掘削ロッドの引き上げ時に、削孔壁面に形成された凹条を突出体を有する円筒体より下方部の掘削ロッドで、擦り潰すことがなく、凹条の形状が保持されるので、水硬性固化材液を填充し硬化後は、突条部が確実に形成される。   With this configuration, when pulling up the drilling rod, the groove formed in the hole wall surface is not crushed by the drilling rod in the lower part of the cylindrical body having the protrusion, and the shape of the groove is maintained. After the hydraulic solidifying material solution is filled and hardened, the ridges are formed with certainty.

さらに、本発明の請求項８に係る水硬性固化材液置換コラム築造方法は、水硬性固化材液の流路を有する掘削ロッド下端部に、その流路に通じる吐出口を有する掘削ヘッドを接続した水硬性固化材液置換コラム築造装置で、前記掘削ロッド下方部に、周側面に回転径が該掘削ロッド径よりも大きな突出体を有する円筒体を、該掘削ロッドに回転可能に遊嵌させた水硬性固化材液置換コラム築造装置を用い、
該築造装置の掘削ロッドを回転させて地盤の所定深度まで掘進した後、掘削ヘッドの吐出口から水硬性固化材液を吐出しつつ、掘削ロッドを回転させて又は無回転で引き上げ、掘削孔内を該水硬性固化材液で填充することを特徴とする。 Furthermore, in the hydraulic solidifying material liquid displacement column construction method according to claim 8 of the present invention, the drilling rod having the flow path of the hydraulic solidifying material liquid is connected to the drilling head having the discharge port communicating with the flow path And a cylindrical body having a protrusion whose diameter of rotation is larger than the diameter of the drilling rod on the circumferential side is freely loosely fitted on the drilling rod in the lower portion of the drilling rod. Hydraulic solidifying material liquid displacement column construction equipment,
After the drilling rod of the construction device is rotated and excavated to a predetermined depth in the ground, the hydraulic rod is discharged from the outlet of the drilling head while the drilling rod is rotated or pulled up without rotation, and within the drilling hole Are filled with the hydraulic solidifying agent solution.

この構成により、円筒体は掘削ロッドに遊嵌され掘削ロッドに対し回転自在であり、しかも円筒体の突出体の回転径は、掘削ロッド径より大きいため、施工機により掘削ロッドを回転しつつ地盤中に掘進して削孔すると、掘削ロッドに遊嵌されている円筒体には回転力は伝わらず、突出体が削孔壁面より外側の地盤内に食い込み回転が阻止されるので、掘削ロッドが回転しても回転せずに掘進する。これにより円筒体の突出体が削孔壁面より外側の地盤内に食い込み掘進した削孔壁面には突出体が食い込んで通過した部分に軌跡空間として突出体の形状に対応した凹条が形成される。従って、掘削ロッドを所定深度まで掘進した後、掘削ヘッドの吐出口より水硬性固化材液を吐出しつつ掘削ロッドを回転して又は無回転で引き上げて削孔内に水硬性固化材液を填充するので、凹条にも水硬性固化材液が充填され、水硬性固化材液が固化すると、コラム外周側面に縦方向の突条部が一体に形成された水硬性固化材液置換コラムとなる。掘削ロッド引き上げ時に、突出体が掘進時の軌跡中を通過すれば凹条孔壁は再び練り付けられてより強固になるし、新たな軌跡の凹条を形成すれば、形成直後に水硬性固化材液が凹条に填充されるので確実に突条部が形成されるのみならず、掘進時に形成された凹条にも水硬性固化材液が填充されるため、硬化後の突条体数が増加して、これに伴い置換コラムの鉛直支持力も増大する。このように、この築造を容易に施工できる。要するに、外周側面に縦方向の突条部を有する鉛直支持力の高い水硬性固化材液置換コラムが築造される施工を容易に実施できる。   With this configuration, the cylindrical body is loosely fitted to the drilling rod and is rotatable with respect to the drilling rod, and the diameter of rotation of the projection of the cylindrical body is larger than the diameter of the drilling rod. When drilling inwards, torque is not transmitted to the cylinder loosely fitted to the drilling rod, and the projection bites into the ground outside the drilling wall surface and rotation is blocked, so the drilling rod Even if it turns it digs without turning. As a result, a concave line corresponding to the shape of the protrusion is formed as a locus space at the portion where the protrusion bites into and passes through the drilling wall surface where the protrusion of the cylindrical body bites into the ground outside the drilling wall surface and cuts. . Therefore, after the drilling rod is drilled to a predetermined depth, the drilling rod is rotated while discharging the hydraulic solidifying material solution from the discharge port of the drilling head or pulled up without rotation so that the hydraulic solidifying material solution is filled in the hole. Therefore, when the hydraulic solidifying material liquid is also filled in the concave line and the hydraulic solidifying material liquid solidifies, the hydraulic solidifying material liquid displacement column is integrally formed with the protruding portion in the longitudinal direction on the outer peripheral side of the column. . When pulling up the drilling rod, if the projection passes through the track during digging, the recessed hole wall is rekneaded and strengthened more strongly, and if a new track of recessed track is formed, hydraulic setting immediately after formation Since the liquid material is filled into the concaves, not only the ridges are surely formed, but also the concaves formed at the time of digging are filled with the hydraulic solidifying material liquid, so the number of projected bodies after curing Increases, along with which the vertical bearing capacity of the displacement column also increases. Thus, this construction can be easily constructed. In short, it is possible to easily carry out the construction in which a hydraulic solidifying material liquid displacement column having a high vertical supporting force, which has ridges in the longitudinal direction on the outer peripheral side, can be constructed.

また、本発明の請求項９に係る水硬性固化材液置換コラム築造方法は、前記円筒体の突出体が、板状の突片で形成されていることを特徴とする。   Further, according to the hydraulic solidifying material liquid displacement column constructing method according to claim 9 of the present invention, the projection of the cylindrical body is formed of a plate-like projecting piece.

この構成により、突出体が板状の突片であるので、地盤中に掘進する際、掘進方向への投影面積が小さく地盤の掘進抵抗が少なくなるので、地盤中の掘進が容易となり、水硬性固化材液置換コラムの施工も容易となる。また、円筒体に突片を複数設けても、掘進抵抗の増加も少ないので、複数を設けての施工ができる。円筒体に突出体としての突片を複数設けて施工すると、築造される水硬性固化材液置換コラム外周に突条部が複数設けられるので、水硬性固化材液置換コラムの鉛直支持力を増大させることができる。   With this configuration, since the projection is a plate-like projecting piece, when digging into the ground, the projected area in the direction of digging is small and the resistance to digging of the ground is reduced, thus facilitating digging in the ground and hydraulicity The construction of the solidifying agent liquid displacement column also becomes easy. In addition, even if a plurality of projections are provided on the cylindrical body, the increase in digging resistance is small, so that the construction can be performed by providing a plurality of projections. When a plurality of projections as projections are provided on the cylindrical body and constructed, a plurality of ridges are provided on the outer periphery of the hydraulic solidifying agent liquid displacement column to be built, so the vertical support force of the hydraulic solidifying agent liquid displacement column is increased It can be done.

また、本発明の請求項１０に係る水硬性固化材液置換コラム築造方法は、前記円筒体は少なくとも２分割可能であり、前記掘削ロッドに対して着脱可能に形成されていることを特徴とする。
この構成により、円筒体は掘削ロッドへの着脱が容易であるので、突出体のサイズや形状の異なる円筒体を選択しての施工が実施できる。 In the hydraulic solidifying material liquid displacement column construction method according to claim 10 of the present invention, the cylindrical body can be divided at least into two, and is formed detachably with respect to the digging rod. .
According to this configuration, since the cylindrical body can be easily attached to and removed from the digging rod, it is possible to select a cylindrical body having a different size and shape of the projecting body.

また、本発明の請求項１１に係る水硬性固化材液置換コラム築造方法は、前記円筒体は、少なくとも２分割された分割片で形成され、該分割片は端部にフランジを備え、該フランジ同士を連結して組み立て可能であることを特徴とする。
この構成により、円筒体は、各分割片のフランジ同士を連結したり、連結を取り外すことで、掘削ロッドに容易に取り付け、取り外しができ、円筒体の突出体のサイズ、形状を最適に選択しての施工ができる。 Further, in the method for constructing a hydraulic liquid-solidified liquid displacement column according to claim 11 of the present invention, the cylindrical body is formed of at least two divided pieces, and the divided pieces have a flange at an end, and the flange It is characterized in that they can be assembled by connecting them.
With this configuration, the cylinder can be easily attached to and removed from the digging rod by connecting the flanges of the divided pieces together or removing the connection, and the size and shape of the projection of the cylinder can be optimally selected. Construction can be done.

また、本発明の請求項１２に係る水硬性固化材液置換コラム築造方法は、前記分割片のフランジ同士を連結して円筒体に組み立てた該フランジを円筒体の突出体とすることを特徴とする。
この構成により、円筒体の突出体を別途設ける必要がないので、この築造方法で使用する水硬性固化材液置換コラム築造装置が安価となる。勿論、このフランジとは別に突出体を設けてもよい。 In the hydraulic solidifying material liquid displacement column construction method according to claim 12 of the present invention, the flanges of the divided pieces are connected to each other and the flanges assembled into a cylindrical body are used as the projecting body of the cylindrical body. Do.
With this configuration, since it is not necessary to separately provide a protrusion of a cylindrical body, the hydraulic solidifying material liquid displacement column construction apparatus used in this construction method becomes inexpensive. Of course, a protrusion may be provided separately from this flange.

さらに、本発明の請求項１３に係る水硬性固化材液置換コラム築造方法は、前記掘削ロッドには前記円筒体の軸方向移動を規制するずれ止めが設けられていることを特徴とする。   Furthermore, in the hydraulic / solidifying material liquid displacement column construction method according to claim 13 of the present invention, the digging rod is provided with a slip stopper that regulates axial movement of the cylindrical body.

この構成により、掘削ロッドの地盤内への掘進中および引上げ中に、円筒体が周辺地盤との摩擦抵抗を受けて掘削ロッド軸上下方向へ移動しようとしても規制して施工することができ、掘削ロッドと共に円筒体を地盤中に確実に掘進及び引き上げさせての施工ができる。   With this configuration, during drilling and raising of the drilling rod into the ground, the cylindrical body can be restricted and constructed even if it moves in the vertical direction of the drilling rod axis due to the frictional resistance with the surrounding ground, With the rod, the cylinder can be dug into the ground with certainty, and can be pulled up.

本発明の請求項１４に係る水硬性固化材液置換コラム築造方法は、前記掘削ロッドが、突出体を有する円筒体を回転可能に遊嵌させた位置より下方部分のロッド径が径小となっていることを特徴とする。   In the hydraulic solidified material liquid displacement column construction method according to a fourteenth aspect of the present invention, the diameter of the rod in the lower portion becomes smaller than the position where the drilling rod loosely fits the cylinder having the protrusion rotatably. It is characterized by

この構成により、掘削ロッドの引き上げ時に、削孔壁面に形成された凹条を、突出体を有する円筒体より下方部のロッドで擦り潰すことを防止しての施工ができ、結果、形成した凹条の形状が保持された状態で水硬性固化材液が填充されるので、填充した水硬性固化材液が硬化後は、保持された凹条に対応する突条部を備える置換コラムとする築造が施工できる。   With this configuration, when pulling up the drilling rod, it is possible to prevent the concave portion formed on the wall surface of the drilled hole from being crushed by the rod at the lower portion than the cylindrical body having the protrusion, and as a result, the concave formed Since the hydraulic solidifying material liquid is filled in a state in which the shape of the strip is maintained, after the filled hydraulic solidifying material liquid is cured, the construction is performed as a displacement column having a ridge corresponding to the held concave. Can be constructed.

なお、本発明で水硬性固化材液とは、水と水和反応して固化するポルトランドセメントのように自硬性を有する粉体と水を主要構成要素として、例えば、セメントスラリー（セメントミルク）や、砂等からなる細骨材を含むモルタル、さらに、吐出口から吐出可能な小径の砂利や砕石等の粗骨材をも含む（セメント）コンクリート等からなり、かつポンプ圧送可能な流動体をいう。   In the present invention, the hydraulic solidifying material liquid is, for example, a cement slurry (cement milk) or a powder having self-hardening property and water as main components, such as Portland cement which solidifies by hydration with water and solidifies. Or a mortar that contains fine aggregate made of sand or the like, (cement) concrete that also contains coarse aggregate such as small-diameter gravel or crushed stone that can be discharged from a discharge port, and that can be pumped. .

本発明の水硬性固化材液置換コラム築造装置及び水硬性固化材液置換コラム築造方法によれば、次のような効果が得られる。
（１）水硬性固化材液置換コラムの外周側面に縦方向の突状部が一体に形成された水硬性固化材液置換コラムを築造することができ、地盤による水硬性固化材液置換コラムの鉛直支持力を増大させることができる。
（２）水硬性固化材液置換コラム外周側面に縦方向の突条部を一体に形成して、地盤による水硬性固化材液置換コラムの鉛直支持力が増大した水硬性固化材液置換コラムを、施工手順の大幅な変更をすることなく、また、コストパフォーマンスを維持したまま、高強度・高品質で築造することができる。
（３）水硬性固化材液置換コラムは、周側面軸方向に突状部を有するので、その分鉛直支持力が高いものとなる。 According to the hydraulic solidifying material liquid replacement column construction apparatus and hydraulic solidifying material liquid replacement column construction how the present invention, the following effects can be obtained.
(1) A hydraulic solidifying agent liquid displacement column can be constructed, in which a projecting portion in the longitudinal direction is integrally formed on the outer peripheral side surface of the hydraulic solidifying agent liquid displacement column, and the hydraulic solidifying agent liquid displacement column by ground Vertical bearing capacity can be increased.
(2) A hydraulic solidifying agent liquid displacement column in which a vertical ridge is integrally formed on the outer peripheral side surface of the hydraulic solidifying agent liquid displacement column to increase the vertical supporting force of the hydraulic solidifying agent liquid displacement column by the ground It can be built with high strength and high quality without making a major change in the construction procedure and maintaining cost performance.
(3) Since the hydraulic solidifying material liquid displacement column has the projecting portion in the axial direction of the circumferential side surface, the vertical supporting force is high accordingly.

以上、本発明について簡潔に説明した。更に、以下に本発明を実施するための最良の形態を添付の図面を参照して、詳細に説明する。   The present invention has been briefly described above. Further, the best mode for carrying out the present invention will be described in detail below with reference to the attached drawings.

本発明の第１実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the principal part of the hydraulic-hardening-solids liquid displacement column construction apparatus concerning 1st Embodiment of this invention. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 図１に示す水硬性固化材液置換コラム築造装置の分解縦断面図である。It is a disassembled longitudinal cross-sectional view of the hydraulic-hardening-agent liquid displacement column construction apparatus shown in FIG. 図３の組み立て状態を示す断面図である。It is sectional drawing which shows the assembled state of FIG. 図４のＢ部拡大図である。It is the B section enlarged view of FIG. 本発明の第２実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 2nd Embodiment of this invention. 図６のＢ−Ｂ線断面図である。It is the BB sectional drawing of FIG. 本発明の第３実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 3rd Embodiment of this invention. 図８のＣ−Ｃ線断面図である。It is the CC sectional view taken on the line of FIG. 本発明の第４実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-solidification-agent liquid substitution column construction apparatus concerning 4th Embodiment of this invention. 図１０のＤ−Ｄ線断面図である。It is the DD sectional view taken on the line of FIG. 本発明の第５実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-solidification-agent liquid substitution column construction apparatus concerning 5th Embodiment of this invention. 図１２のＥ−Ｅ線断面図である。It is the EE sectional view taken on the line of FIG. 本発明の第６実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 6th Embodiment of this invention. 図１４のＦ−Ｆ線断面図である。It is the FF sectional view taken on the line of FIG. 本発明の第７実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 7th Embodiment of this invention. 図１６のＧ−Ｇ線断面図である。It is the GG sectional view taken on the line of FIG. 水硬性固化材液置換コラムの突条部に作用するせん断抵抗力とせん断応力の様子を示す説明図である。It is explanatory drawing which shows the mode of the shear resistance and shear stress which act on the projection part of a hydraulic-hardening-solids liquid substitution column. 図１８のＸ−Ｘ線断面図である。It is XX sectional drawing of FIG. 本発明の第８実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 8th Embodiment of this invention. 図２０のＨ−Ｈ線断面図である。It is the HH sectional view taken on the line of FIG. 本発明の第９実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 9th Embodiment of this invention. 図２２のＩ−Ｉ線断面図である。It is the II sectional view taken on the line of FIG. 本発明の第１０実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 10th Embodiment of this invention. 図２４のＪ−Ｊ線断面図である。It is the JJ sectional view taken on the line of FIG. 本発明の第１１実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 11th Embodiment of this invention. 図２６のＫ−Ｋ線断面図である。It is the KK sectional view taken on the line of FIG. 第１１実施の形態にかかる水硬性固化材液置換コラム築造装置を用いて水硬性固化材液置換コラムを築造する様子を工程順（ａ）（ｂ）（ｃ）に示す断面図で、上段が断面正面図、下段が上段のＺ−Ｚ線断面図である。The top view is a cross-sectional view showing in order of process (a) (b) (c) how a hydraulic solidifying material liquid displacement column is built using the hydraulic solidifying material liquid displacement column construction device according to the eleventh embodiment. A cross-sectional front view and a lower stage are Z-Z line sectional views of an upper stage. 本発明の第１２実施の形態にかかる水硬性固化材液置換コラム築造装置の要部を示す正面図である。It is a front view which shows the principal part of the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 12th Embodiment of this invention. 図２９のＬ−Ｌ線断面図である。It is the LL sectional view taken on the line of FIG. 掘削ヘッドの他例を示す要部斜視図である。It is a principal part perspective view which shows the other example of a drilling head. 本発明にかかる水硬性固化材液置換コラム築造装置による水硬性固化材液置換コラムの築造方法を、工程順（ａ）（ｂ）（ｃ）（ｄ）（ｅ）（ｆ）に示す説明図である。Explanatory drawing which shows the construction method of the hydraulic solidification agent liquid substitution column by the hydraulic solidification agent liquid substitution column construction device concerning the present invention to process order (a) (b) (c) (d) (e) (f) It is. 第１実施の形態にかかる水硬性固化材液置換コラム築造装置で築造された置換コラム（ａ）および第２実施の形態にかかる水硬性固化材液置換コラム築造装置で築造された置換コラム（ｂ）を示す斜視図である。A displacement column (a) constructed by the hydraulic solidifying material liquid displacement column construction device according to the first embodiment and a displacement column (b) constructed by the hydraulic hardening solid material liquid displacement column construction device according to the second embodiment ) Is a perspective view. 本発明にかかる水硬性固化材液置換コラム築造装置で築造される他の置換コラムを例示（ａ）（ｂ）（ｃ）する斜視図である。It is a perspective view which illustrates other substitution columns built with hydraulic solidification material liquid substitution column construction device concerning the present invention (a) (b) (c). 本発明にかかる水硬性固化材液置換コラム築造装置で築造される更に他の置換コラム（ａ）（ｂ）を説明する斜視図である。It is a perspective view explaining the further another substitution column (a) (b) built with the hydraulic-solidification-material liquid displacement column construction apparatus concerning this invention. 本発明にかかる水硬性固化材液置換コラム築造装置で築造されるまた更に他の置換コラム（ａ）（ｂ）を説明する斜視図である。It is a perspective view explaining the further another substitution column (a) (b) built with the hydraulic solidification material liquid substitution column construction device concerning the present invention. 従来の水硬性固化材液置換コラム築造装置による施工手順を示す説明図（ａ）（ｂ）（ｃ）（ｄ）（ｅ）（ｆ）である。It is explanatory drawing (a) (b) (c) (d) (e) (f) which shows the construction procedure by the conventional hydraulic-solidification-material liquid displacement column construction apparatus.

以下、本発明の実施の形態による水硬性固化材液置換コラム築造装置及び水硬性固化材液置換コラム築造方法を図面を参照して説明する。
Hereinafter will be described the hydraulic solidifying material liquid replacement column construction apparatus and hydraulic solidifying material liquid replacement column construction how according to an embodiment of the present invention with reference to the drawings.

図１は、第１実施の形態に係る水硬性固化材液置換コラム築造装置を示す要部の正面図、図２は図１のＡ−Ａ線断面図、図３は図１に示す水硬性固化材液置換コラム築造装置の分解縦断面図、図４は図３に示す水硬性固化材液置換コラム築造装置の組み立て状態を示す縦断面図、図５は図４のＢ部拡大図である。   1 is a front view of the main part of the hydraulic solidifying material liquid displacement column constructing apparatus according to the first embodiment, FIG. 2 is a sectional view taken along the line A-A of FIG. 1, and FIG. 3 is hydraulic property shown in FIG. 4 is a longitudinal sectional view showing the assembled state of the hydraulic solidified material liquid displacement column construction apparatus shown in FIG. 3, and FIG. 5 is an enlarged view of a portion B in FIG. .

この水硬性固化材液置換コラム築造装置１Ａは、下端に逆円錐状（下方に向かって径小になる円錐形状）の掘削ヘッド２を接続した掘削ロッド１を備える。掘削ヘッド２は水硬性固化材液の流路１ｄに通じる吐出口２ｂを有する。掘削ヘッド２は外周面に、掘削ロッド１の正回転時に掘削土砂を上方に押し上げる方向の螺旋状の掘削翼（スパイラル翼）２ａを有する。また、掘削ロッド１の下方部の外周面には円筒体４が回転自在に遊嵌されていて、この円筒体４の外周面には掘削ロッド１の回転径より大きな回転径を持つ突出体５が固設されている。本例の突出体５はブロック状のものを示しており、円筒体４の対称位置に２個設けられている。これらのブロック状の突出体４は、同一形状、同一サイズである。   The hydraulic solidifying material liquid displacement column construction apparatus 1A is provided with a digging rod 1 connected at its lower end to an inverted conical (conical shape that decreases in diameter downward) drilling head 2. The drilling head 2 has a discharge port 2b communicating with the flow path 1d of the hydraulic solidifying material solution. The drilling head 2 has a spiral drilling blade (spiral wing) 2a in the direction of pushing up the digging earth at the time of forward rotation of the drilling rod 1 on the outer peripheral surface. In addition, a cylindrical body 4 is loosely fitted on the outer peripheral surface of the lower portion of the drilling rod 1 so as to be freely rotatable, and the outer peripheral surface of the cylindrical body 4 is a projecting body 5 having a larger diameter of rotation than the diameter of the drilling rod 1. Is fixed. The protrusions 5 in this example are in the form of blocks, and two are provided at symmetrical positions of the cylindrical body 4. These block-shaped protrusions 4 have the same shape and the same size.

掘削ロッド１に円筒体４を回転自在に遊嵌させる構成としては、例えば、図３乃至図５に示すように掘削ロッド１のロッド継手部１ｃと掘削ヘッド２のヘッド継手部２ｄとにおいて掘削ロッド１と掘削ヘッド２を連結する際に、両継手部１ｃと２ｄの間に介在させて設ける構成を挙げることができる。
図３は、水硬性固化材液置換コラム築造装置１Ａの分解縦断面図である。この図３に示すように掘削ロッド１の下端には、ロッド継手部１ｃが設けられ、掘削ヘッド２の上部にはヘッド継手部２ｄが設けられている。そして掘削ヘッド２は、そのヘッド継手２ｄが掘削ロッド１のロッド継手１ｃに嵌入し、図５に示すようにシェアブロック３ａにボルト３ｂで固定して両者は接続するが、その際に予め、例えば、ヘッド継手部２ｄに円筒体４を挿着しておき、図４に示すように両継手部１ｃ、２ｄを結合することで、円筒体４を掘削ロッド１に回転自在に取り付けることができる。ヘッド継手部２ｄは、ロッド継手部１ｃより少し小径となっており、段部２ｅを有し、一方、ロッド継手部１ｃの下端とヘッド継手部２ｄとの間に段部１ｅが生じ、円筒体４はこの段部１ｅと２ｅとの間に遊嵌され回転は自由であるものの、この段部１ｅと２ｅで軸上下方向の移動は規制されている。このようにして図１に示す水硬性固化材液置換コラム築造装置１Ａは製作される。 For example, as shown in FIG. 3 to FIG. 5, as the structure for freely fitting the cylindrical body 4 into the drilling rod 1 freely, the drilling rod is connected to the rod joint portion 1c of the drilling rod 1 and the head joint portion 2d of the drilling head 2 When 1 and the drilling head 2 are connected, the structure which intervenes and provides between both joint part 1c and 2d can be mentioned.
FIG. 3 is an exploded vertical sectional view of the hydraulic / solidifying material liquid displacement column construction apparatus 1A. As shown in FIG. 3, a rod joint portion 1 c is provided at the lower end of the drilling rod 1, and a head joint portion 2 d is provided at an upper portion of the drilling head 2. The head joint 2d of the drilling head 2 is inserted into the rod joint 1c of the drilling rod 1 and fixed to the shear block 3a with the bolt 3b as shown in FIG. The cylindrical body 4 can be rotatably attached to the digging rod 1 by inserting the cylindrical body 4 into the head joint portion 2d and coupling the both joint portions 1c and 2d as shown in FIG. The head joint portion 2d has a diameter slightly smaller than that of the rod joint portion 1c and has a step portion 2e, while the step portion 1e is generated between the lower end of the rod joint portion 1c and the head joint portion 2d. Although 4 is loosely fitted between the step portions 1e and 2e and is free to rotate, movement in the axial vertical direction is restricted by the step portions 1e and 2e. Thus, a hydraulic solidifying material liquid displacement column construction apparatus 1A shown in FIG. 1 is manufactured.

かかる構成になる水硬性固化材液置換コラム築造装置１Ａによれば、施工機（図示省略）に掘削ロッド１を取り付け、掘削ロッド１を回転しつつ地盤中に掘進して削孔すると、円筒体４は掘削ロッド１を回転させても回転自在に遊嵌されているため、回転力が伝わらないので、地盤中では地盤抵抗を受けて回転せず、突出体５は削孔壁面より外側の地盤内に食い込み掘削ロッド１の掘進とともに地中に進入する。これにより円筒体４の突出体５が削孔壁面より外側の地盤内に食い込み掘進した削孔壁面には突出体５が通過した軌跡空間が凹条（縦条）に形成される。この軌跡空間で形成される凹条は突出体５の形状に対応した形状となるが、その後地盤の弾性戻り等によって多少変化することもある。   According to the hydraulic solidifying material liquid displacement column construction apparatus 1A having such a configuration, the drilling rod 1 is attached to a construction machine (not shown), and drilling is carried out in the ground while rotating the drilling rod 1, a cylindrical body Since 4 is loosely fitted even if the drilling rod 1 is rotated, the rotational force is not transmitted since it receives ground resistance in the ground and does not rotate, and the protrusion 5 is ground outside the drilling wall surface It bites into the ground and enters the ground as the drilling rod 1 digs. As a result, a trace space through which the protrusion 5 has passed is formed in a concave line (longitudinal stripe) on the drilled wall surface where the protrusion 5 of the cylindrical body 4 bites into the ground outside the drilled wall surface. The concave formed in this trajectory space has a shape corresponding to the shape of the protrusion 5, but may change somewhat due to elastic return of the ground thereafter.

従って、掘削ロッド１を所定深度まで掘進した後、掘削ヘッド２の吐出口２ｂより水硬性固化材液を吐出しつつ掘削ロッド１を回転し又は無回転で引き上げて削孔内の所定の天端レベル位置まで水硬性固化材液を填充すると、凹条（縦条）にも水硬性固化材液が満たされるので、水硬性固化材液が固化（硬化）すると、図３３（ａ）に示すようなコラム外周側面に縦方向の突条部１２が本体と一体に形成された水硬性固化材液置換コラム１１が築造される。本例では、円筒体４の対称位置に突出体５が２個設けられているので、築造される水硬性固化材液置換コラム１１にも図３３（ａ）に示すように突条部１２が対称位置に２個設けられている。この突条部１２は、地盤との周面摩擦力によって水硬性固化材液置換コラム１１の鉛直支持力を増大させるものとなる。
なお、円筒体４の突出体５は、前述のように地盤中に進入するので、突出体５の地盤内への進入をスムーズにするため、突出体５の角部分は切り欠いたカット部Ｐとするのが好ましい。 Therefore, after the drilling rod 1 is drilled to a predetermined depth, the drilling rod 1 is rotated or pulled up without rotation while discharging the hydraulic hardening solid solution from the discharge port 2b of the drilling head 2, and a predetermined top end in the drilling is As shown in FIG. 33 (a), when the hydraulic solidifying material liquid is filled up to the level position, the concave solid lines (vertical stripes) are also filled with the hydraulic solidifying liquid, and when the hydraulic solidifying material liquid solidifies (hardens), as shown in FIG. A hydraulic solidifying material liquid displacement column 11 is constructed in which longitudinal ridges 12 are integrally formed with the main body on the outer peripheral side of the column. In this example, since two protrusions 5 are provided at symmetrical positions of the cylindrical body 4, the ridge portion 12 is also formed in the hydraulic solidifying material liquid displacement column 11 to be built as shown in FIG. Two are provided at symmetrical positions. The ridges 12 increase the vertical supporting force of the hydraulic solidifying material liquid displacement column 11 due to the circumferential surface frictional force with the ground.
In addition, since the protrusion 5 of the cylindrical body 4 approachs into the ground as mentioned above, in order to make the approach of the protrusion 5 in the ground smooth, the cut part P which the corner part of the protrusion 5 cut out It is preferable to

図６は、第２実施の形態に係る水硬性固化材液置換コラム築造装置を示す要部の正面図、図７は図６のＢ−Ｂ線断面図である。
この第２実施の形態に係る水硬性固化材液置換コラム築造装置１Ｂは、掘削ロッド１の下方部外周面に円筒体４を回転自在に遊嵌し、この円筒体４の外周面に長方形の板状の突片５ｂからなる突出体５を２枚、対称位置に固設したもので有り、他は前記第１実施の形態と同様であるので、同様な構成要素には同一符号を付して他の詳細な説明は省略する。突片５ｂからなる突出体５の上下の角部分も地盤内への進入をスムーズにするために切り欠いたカット部Ｐとなっている。また、２枚の突片５ｂからなる突出体５も同一形状、同一サイズである。
この第２実施の形態の水硬性固化材液置換コラム築造装置１Ｂによれば、突出体５が長方形の板状の突片５ｂで形成されているため、築造される水硬性固化材液置換コラム１１の突条部１２は、図３３（ｂ）に示すような該突片５ｂの形状に対応したものとなる。 FIG. 6 is a front view of the main part of the hydraulic solidifying material liquid displacement column constructing apparatus according to the second embodiment, and FIG. 7 is a sectional view taken along the line B-B in FIG.
A hydraulic solidifying material liquid displacement column construction apparatus 1B according to the second embodiment has the cylindrical body 4 rotatably loosely fitted on the outer peripheral surface of the lower portion of the digging rod 1, and the outer peripheral surface of the cylindrical body 4 has a rectangular shape. Two projections 5 each consisting of a plate-like projection 5b are fixed at symmetrical positions, and the other parts are the same as in the first embodiment, so the same reference numerals are given to similar components. Other detailed descriptions will be omitted. The upper and lower corner portions of the protrusion 5 formed of the projecting pieces 5b are also cut portions P cut away in order to make the entry into the ground smooth. Moreover, the protrusion 5 which consists of the projecting piece 5b of 2 sheets is also the same shape and the same size.
According to the hydraulic solidifying material liquid substitution column building-up device 1B of the second embodiment, since the projecting body 5 is formed of the rectangular plate-like projecting piece 5b, the hydraulic solidifying material liquid substitution column to be built The protruding ridge portions 12 of 11 correspond to the shape of the protruding piece 5b as shown in FIG. 33 (b).

前記突片５ｂからなる突出体５は、２枚に限定されるものではなく、３枚以上とすることは自由に選択でき、また、その突出方向長さを長短としたり、任意のサイズ、形状とすることもできる。けれども突片５ｂからなる突出体５の長さが長過ぎたり、固設数が増えると掘進時の地盤抵抗が増え、掘進不能に陥ったり、また、周辺地盤を乱して逆に硬化後の地盤の周辺摩擦力を低下させる。従って、突出体５はその突出長が掘削ロッド１の径Ｄ以下、好ましくはＤ／２以下とし、その固設数は２枚以上８枚以下、好ましくは３〜６枚がよい。   The number of projections 5 formed of the projecting pieces 5b is not limited to two, and three or more may be freely selected, and the length in the direction of protrusion may be long or short, or any size or shape It can also be done. However, if the length of the protrusion 5 consisting of the projecting pieces 5b is too long or the number of fixed members increases, the ground resistance at the time of digging increases, and digging becomes impossible, or the surrounding ground is disturbed and conversely after hardening. Reduce the friction around the ground. Therefore, the protrusion 5 has a protrusion length equal to or less than the diameter D of the digging rod 1, preferably D / 2 or less, and the number of fixed members is 2 or more and 8 or less, preferably 3 to 6.

図８は、第３実施の形態に係る水硬性固化材液置換コラム築造装置を示す要部の正面図、図９は、図８のＣ−Ｃ線断面図である。この第３実施の形態に係る水硬性固化材液置換コラム築造装置１Ｃは、前記第２実施の形態の変形例で有り、前記長方形の板状の突片５ｂからなる突出体５を、円筒体４の外周面に３枚を等間隔（１２０度間隔）で固設した場合である。他は前記実施の形態と同様であるので同一符号を付して他の説明は省略する。   FIG. 8 is a front view of the main part of the hydraulic solidifying material liquid displacement column constructing apparatus according to the third embodiment, and FIG. 9 is a sectional view taken along the line C-C in FIG. A hydraulic solidifying material liquid displacement column construction apparatus 1C according to the third embodiment is a modification of the second embodiment, and the projecting body 5 formed of the rectangular plate-like projecting piece 5b is a cylindrical body In this case, three sheets are fixed to the outer peripheral surface of No. 4 at equal intervals (120 degrees). The other parts are the same as those of the above embodiment, so the same reference numerals are given and the other descriptions are omitted.

前記第２実施の形態及び第３実施の形態のように突出体５を板状の突片５ｂで形成すると、地盤中への掘進抵抗および地盤内からの引き上げ抵抗を軽減できる効果がある。
第２実施の形態および第３実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｂ、１Ｃにおいては、板状の突片５ｂで形成した突出体５の形状に対応した凹条を削孔内壁面に形成でき、この削孔内に水硬性固化材液が填充されることで、これらの凹条にも水硬性固化材液が満たされる。従って、填充した水硬性固化材液が固化することで、その凹条形状に対応する突条部１２を水硬性固化材液置換コラム１１の外周に、前記同様に形成できる。従って、突片５ｂからなる突出体５の枚数を変えたり、サイズを長短とすることで、突片５ｂからなる突出体５の枚数およびサイズに応じた突条部１２を形成でき、所期の鉛直支持力を有する水硬性固化材液置換コラムを得ることができる。 When the projecting body 5 is formed of the plate-like projecting piece 5b as in the second embodiment and the third embodiment, it is possible to reduce the digging resistance into the ground and the pulling resistance from the ground.
In the hydraulic solidifying material liquid displacement column construction apparatuses 1B and 1C according to the second embodiment and the third embodiment, the concave streak corresponding to the shape of the protrusion 5 formed by the plate-like projecting piece 5b is drilled. It can be formed on the inner wall surface, and the hydraulic solidifying agent liquid is filled in the hole, so that the concave solid line is also filled with the hydraulic solidifying agent liquid. Therefore, by solidifying the filled hydraulic solidifying material solution, the ridges 12 corresponding to the concave shape can be formed on the outer periphery of the hydraulic solidifying material liquid displacement column 11 in the same manner as described above. Therefore, by changing the number of the protrusions 5 formed of the protrusions 5 b or changing the size of the protrusions 5, the protrusions 12 corresponding to the number and the size of the protrusions 5 formed of the protrusions 5 b can be formed. A hydraulic solidifying material liquid displacement column having a vertical supporting force can be obtained.

図１０は、第４実施の形態にかかる水硬性固化材液置換コラム築造装置を示す要部の正面図、図１１は、図１０のＤ−Ｄ線断面図である。
この第４実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｄは、板状の突片５ｂの外周先端が尖端５ｃとなっている突出体５を、円筒体４の外周面に４枚を等間隔（９０度間隔）で固設した場合であり、他は前記実施の形態と同様であるので同一符号を付して説明は省略する。 FIG. 10 is a front view of the main part of the hydraulic solidifying material liquid displacement column constructing apparatus according to the fourth embodiment, and FIG. 11 is a sectional view taken along the line D-D in FIG.
A hydraulic solidifying material liquid displacement column construction apparatus 1D according to the fourth embodiment has four projections 5 on the outer peripheral surface of the cylindrical body 4 in which the outer peripheral tip of the plate-like projection 5b is a pointed end 5c. Are fixed at equal intervals (90.degree. Intervals), and the other components are the same as those of the embodiment described above, so the same reference numerals are given and the description is omitted.

この実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｄでは、突出体５を形成する板状の突片５ｂの外周先端が尖端５ｃとなっているので、地盤中での掘進抵抗および引上げ抵抗が一層軽減され、施工性が向上する。即ち、突出体５の地盤中での掘進抵抗および引上げ抵抗が軽減されるので、掘削ロッド１の地盤内への掘進および地盤内からの引上げが容易となり速やかに実施できる。
この第４実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｄにおいても、外周先端が尖端５ｃとなっている板状の突片５ｂで形成した突出体５の形状に対応した４条の凹条を削孔内壁面に形成でき、この削孔内に水硬性固化材液が填充されることで、これらの凹条にも水硬性固化材液が満たされる。従って、填充した水硬性固化材液が固化することで、その凹条形状に対応する４条の突条部１２を水硬性固化材液置換コラム１１の外周に前記同様に形成できる。 In the hydraulic solidifying material liquid displacement column construction apparatus 1D according to this embodiment, the outer peripheral tip of the plate-like projecting piece 5b forming the projecting body 5 is the pointed end 5c, so digging resistance in the ground and pulling up The resistance is further reduced and the workability is improved. That is, since the digging resistance and the pulling resistance in the ground of the protrusion 5 are reduced, the digging rod 1 can be easily digged into the ground and pulled from the ground, and can be implemented promptly.
Also in the hydraulic solidified material liquid displacement column constructing apparatus 1D according to the fourth embodiment, four strips corresponding to the shape of the projecting body 5 formed by the plate-like projecting piece 5b whose outer peripheral tip is the pointed end 5c. The recessed streaks can be formed on the inner wall surface of the drilling hole, and by filling the hydraulic solidified solidification agent liquid in the drilling hole, these recessed streaks are also filled with the hydraulic solidified solidification agent liquid. Accordingly, by solidifying the filled hydraulic solidifying material solution, four ridges 12 corresponding to the concave shape can be formed on the outer periphery of the hydraulic solidifying material liquid displacement column 11 in the same manner as described above.

図１２は、第５実施の形態にかかる水硬性固化材液置換コラム築造装置を示す要部の正面図、図１３は、図１２のＥ−Ｅ線断面図である。
この第５実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｅは、前記第４実施の形態の変形例であり、外周先端が尖端５ｃとなっている板状の突片５ｂで形成した突出体５が６枚設けられている場合である。即ち、板状の突片５ｂの外周先端が尖端５ｃとなっている突出体５を、掘削ロッド１の下方部に回転自在に遊嵌した円筒体４の外周面に６枚を等間隔（６０度間隔）で固設した場合である。他は前記実施の形態と同様であるので同一符号を付して説明は省略する。 FIG. 12 is a front view of the main part of the hydraulic solidifying material liquid displacement column constructing apparatus according to the fifth embodiment, and FIG. 13 is a sectional view taken along the line E-E of FIG.
The hydraulic solidifying material liquid displacement column constructing apparatus 1E according to the fifth embodiment is a modification of the fourth embodiment, and is formed of a plate-like projecting piece 5b whose outer peripheral tip is a pointed end 5c. This is the case where six protrusions 5 are provided. That is, six pieces are equally spaced on the outer peripheral surface of the cylindrical body 4 in which the protrusion 5 whose outer peripheral tip of the plate-like protrusion 5b is the pointed end 5c is loosely fitted rotatably around the lower part of the drilling rod 1 (60 When fixed at an interval of The other parts are the same as those of the above embodiment, so the same reference numerals are given and the description is omitted.

本例では、突出体５が６枚設けられているので、削孔内壁面には６条の凹条が形成されることになり、従って、築造される水硬性固化材液置換コラム１１には６条の突出部１２が等間隔に形成される。   In this example, since six projections 5 are provided, six concave streaks are formed on the inner wall surface of the hole, and therefore, the hydraulic solidifying material liquid displacement column 11 to be built is Six projections 12 are formed at equal intervals.

図１４は、第６実施の形態にかかる水硬性固化材液置換コラム築造装置を示す要部の正面図、図１５は、図１４のＦ−Ｆ線断面図である。
この第６実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｆは、図１０および図１１に示す実施の形態の変形例であり、外周先端が尖端５ｃとなっている板状の突片５ｂを三角形状とした突出体５で形成した場合である。即ち、三角形の板状の突片５ｂの外周先端が尖端５ｃとなっている突出体５を、掘削ロッド１の下方部に回転自在に遊嵌した円筒体４の外周面に４枚を等間隔（９０度間隔）で固設した場合である。他は前記実施の形態と同様であるので同一符号を付して説明は省略する。 FIG. 14: is a front view of the principal part which shows the hydraulic-hardening-agent liquid displacement column construction apparatus concerning 6th Embodiment, FIG. 15: is the FF sectional view taken on the line of FIG.
The hydraulic solidifying material liquid displacement column constructing apparatus 1F according to the sixth embodiment is a modification of the embodiment shown in FIGS. 10 and 11, and has a plate-like projecting piece whose outer peripheral tip is a pointed end 5c. It is a case where it forms with the protrusion 5 which made 5b triangular shape. That is, four pieces of the projection 5 having the tip of the outer periphery of the triangular plate-like projection 5b are equally spaced on the outer peripheral surface of the cylindrical body 4 rotatably loosely fitted in the lower part of the drilling rod 1 It is a case where it fixes (at 90 degree intervals). The other parts are the same as those of the above embodiment, so the same reference numerals are given and the description is omitted.

本例では、突出体５が三角形の板状の突片５ｂで形成されているので、図１４に示すように板材からなる突片５ｂは、掘削ロッド１の外周面より外方に２つの傾斜縁ａ、ｂを突出させるように三角状に尖端化している。従って、このような突片５ｂの先端化と外周先端の尖端５ｃと相俟って、突出体５の地盤内への掘進抵抗および地盤内からの引き上げ抵抗をさらに一層軽減できるので、結果、掘削ロッド１の地盤内への掘進および地盤からの引き上げが容易となり施工性が向上する。   In this example, since the protrusion 5 is formed by a triangular plate-like projecting piece 5b, the projecting piece 5b made of a plate material has two inclinations outward from the outer peripheral surface of the drilling rod 1 as shown in FIG. A triangular tip is used to project the edges a and b. Accordingly, combined with the tip end of the projecting piece 5b and the tip 5c of the outer peripheral tip, the resistance to digging into the ground and the resistance to pulling up from the ground can be further reduced, resulting in digging. It is easy to dig the rod 1 into the ground and pull it up from the ground, and the workability is improved.

この第６実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｆにおいても、外周先端が尖端５ｃとなっている三角形状の板状の突片５ｂで形成した突出体５の形状に対応した４条の凹条を削孔内壁面に形成でき、この削孔内に水硬性固化材液が填充されることで、これらの凹条にも水硬性固化材液が填充される。従って、填充した水硬性固化材液が固化することで、その凹条形状に対応する４条の突条部１２を水硬性固化材液置換コラム１１の外周に、前記同様に形成できる。   The hydraulic solidifying material liquid displacement column construction apparatus 1F according to the sixth embodiment also corresponds to the shape of the protrusion 5 formed by the triangular plate-like projecting piece 5b whose outer peripheral tip is the pointed end 5c. Four recessed streaks can be formed on the inner wall surface of the bored hole, and by filling the bored hole with the hydraulic solidifying material solution, the recessed bead can be filled with the hydraulically solidified solid material solution. Accordingly, by solidification of the filled hydraulic solidifying material solution, four ridges 12 corresponding to the concave shape can be formed on the outer periphery of the hydraulic solidifying material liquid displacement column 11 in the same manner as described above.

図１６は、第７実施の形態にかかる水硬性固化材液置換コラム築造装置を示す要部の正面図、図１７は、図１６Ｇ−Ｇ線断面図である。
この第７実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｇは、断面が、根元部が厚く、先端部に向かって徐々に薄くなる板状の突片５ｂで形成した突出体５を、掘削ロッド１の下方部に回転自在に遊嵌した円筒体４の外周面に４枚を等間隔（９０度間隔）で固設したものである。他は前記実施の形態と同様であるので同一符号を付して説明は省略する。 FIG. 16 is a front view of the main part of the hydraulic solidifying material liquid displacement column constructing apparatus according to the seventh embodiment, and FIG. 17 is a cross-sectional view of FIG.
A hydraulic solidifying material liquid displacement column constructing device 1G according to the seventh embodiment has a cross section formed of a projecting member 5 formed of a plate-like projecting piece 5b having a thick root portion and gradually thinning toward a tip end portion. Four pieces are fixed at equal intervals (90 degrees intervals) on the outer peripheral surface of the cylindrical body 4 rotatably fitted loosely in the lower part of the digging rod 1. The other parts are the same as those of the above embodiment, so the same reference numerals are given and the description is omitted.

この実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｇにおいても、断面が、根元部（円筒体４との接続部側）が厚く、先端部に向かって徐々に薄くなる板状の突片５ｂで形成した突出体５の形状に対応した４条の凹条を削孔内壁面に形成でき、この削孔内に水硬性固化材液が填充されることで、これらの凹条にも水硬性固化材液が満たされるから、填充した水硬性固化材液が固化すると、図３４（ａ）に示すような、その凹条形状に対応する４条の突条部１２が外周に形成された水硬性固化材液置換コラム１１が築造される。   Also in the hydraulic solidifying material liquid displacement column construction apparatus 1G according to this embodiment, a plate-like protrusion having a thick cross section at the root (the connection with the cylindrical body 4) side and gradually thinning toward the tip Four concave streaks corresponding to the shape of the protrusion 5 formed by the piece 5b can be formed on the inner wall surface of the borehole, and the hydraulic solidifying material liquid is filled in the borehole, thereby making these concave bars Since the hydraulic solidifying material solution is filled, when the filled hydraulic solidifying material liquid solidifies, four ridges 12 corresponding to the concave shape are formed on the outer periphery as shown in FIG. 34 (a). A hydraulic solidifying material liquid displacement column 11 is built.

図１８は、固化後の水硬性固化材液置換コラム１１の突条部１２に作用するせん断抵抗力とせん断力とを示す説明図、図１９は、図１８のＸ−Ｘ線断面図である。
水硬性固化材液置換コラム１１が固化後に上部構造物からの押し込み荷重が作用するとき、該コラム１１側面に形成された突条部１２には地盤からのせん断抵抗力が作用して、該コラム１１の支持力として協働する。このとき、突条部１２の表面に作用するせん断応力はせん断力となって突状部１２に作用するので、結果的には突条部１２と水硬性固化材液置換コラム１１本体の接続部に最大せん断力が作用することになる。したがって、突条部１２を構造材としたとき、せん断力の大きさに応じた断面積とするほうがより合理的である。すなわち、せん断力の大きさに応じて、図１９に示すように突条部１２の先端側肉厚ｔ１をより小さく、水硬性固化材液置換コラム１１本体との接続部側の肉厚ｔ２をより大きくした形状にすることが、コラムの材料支持力を大きくするためにはより合理的である。
一方、施工時の水硬性固化材液置換コラム築造装置１Ｇの突出体５に作用する応力についても同様のことが言える。すなわち、突出体５の表面に作用するせん断応力はせん断力となって突出体５に作用するので、結果的には突出体５と遊嵌円筒体４との接続部に最大せん断力が作用することになる。したがって、突出体５はその先端側肉厚をより小さく、遊嵌円筒体４との接続部側の肉厚をより大きくした形状にすることが、突出体５の耐久性を向上させるためにはより合理的である。従って、円筒体４の固設する突出体５の形態は、断面が、円筒体４との接続部側（根元部）が厚く、先端部に向かって徐々に薄くなる板状の突片５ｂで形成するのが好ましい。
このような点から、この実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｇは、好ましい装置といえる。 FIG. 18 is an explanatory view showing a shearing resistance and a shearing force acting on the ridge portion 12 of the hydraulically solidified material liquid displacement column 11 after solidification, and FIG. 19 is a sectional view taken along the line X-X in FIG. .
When a pressing load from the upper structure acts after solidification of the hydraulic fluid-solidifying material liquid displacement column 11, shear resistance from the ground acts on the ridges 12 formed on the side surface of the column 11, and the column We cooperate as support power of 11. At this time, a shear stress acting on the surface of the ridge 12 acts as a shear force and acts on the ridge 12. As a result, the junction of the ridge 12 and the hydraulic solidifying material liquid displacement column 11 main body Maximum shear force will act on the Therefore, when the ridges 12 are used as a structural material, it is more rational to set the cross-sectional area according to the magnitude of the shear force. That is, according to the magnitude of the shear force, as shown in FIG. 19, the thickness t2 on the connection side with the hydraulic solidifying material liquid displacement column 11 is smaller than the thickness t1 on the tip side of the ridge 12 A larger shape is more reasonable to increase the material support of the column.
On the other hand, the same thing can be said about the stress which acts on the protrusion 5 of the hydraulic solidifying material liquid displacement column construction device 1G at the time of construction. That is, since the shear stress acting on the surface of the protrusion 5 acts as a shear force and acts on the protrusion 5, as a result, the maximum shear force acts on the connection portion between the protrusion 5 and the loosely fitted cylindrical body 4 It will be. Therefore, in order to improve the durability of the protrusion 5, the protrusion 5 has a smaller thickness at the tip end side and a larger thickness at the connection portion with the loose fitting cylindrical body 4. It is more rational. Therefore, the form of the fixed protrusion 5 of the cylindrical body 4 is a plate-like protruding piece 5b whose section is thicker at the connecting portion side (root portion) with the cylindrical body 4 and gradually becomes thinner toward the tip end portion. It is preferable to form.
From such a point, hydraulic solidifying material liquid displacement column construction apparatus 1G concerning this embodiment can be said to be a desirable apparatus.

図２０は第８実施の形態にかかる水硬性固化材液置換コラム築造装置を示す要部の正面図、図２１は、図２０のＨ−Ｈ線断面図である。この水硬性固化材液置換コラム築造装置１Ｈは、下端に逆円錐状の掘削ヘッド２を接続した掘削ロッド１を備える。掘削ヘッド２には水硬性固化材液の流路１ｄに通じる吐出口２ｂを有する。掘削ヘッド２は外周面に螺旋状の掘削翼（スパイラル翼）２ａを有する。また、掘削ロッド１外周面には円筒体４が回転自在に遊嵌されていて、この円筒体４の外周には掘削ロッド１の径より大きい回転径を持つ突出体５が設けられている。   FIG. 20 is a front view of the main part of the hydraulic solidifying material liquid displacement column constructing apparatus according to the eighth embodiment, and FIG. 21 is a sectional view taken along the line HH of FIG. The hydraulic solidifying material liquid displacement column construction apparatus 1H includes a digging rod 1 having an inverted conical drilling head 2 connected at its lower end. The drilling head 2 has a discharge port 2 b communicating with the flow path 1 d of the hydraulic solidifying material liquid. The drilling head 2 has a spiral drilling blade (spiral blade) 2a on the outer peripheral surface. In addition, a cylindrical body 4 is freely loosely fitted on the outer peripheral surface of the digging rod 1, and on the outer periphery of the cylindrical body 4 is provided a protrusion 5 having a larger diameter of rotation than the diameter of the digging rod 1.

前記円筒体４は、左右両端に平板状のフランジ４ａを持つ半円筒板４ｂを１対用意し、これらを掘削ロッド１の周囲にこれを囲い込むように宛がい、さらに各半円筒板４ｂのフランジ４ａのうち対面するものどうしを互いに当接し、これらの当接部位をボルト・ナットなどの締結具７を用いて連結したものからなる。このようなフランジ４ａと半円筒板４ｂとからなる円筒体４は、その内径が掘削ロッド１の外径よりも僅かに大きく、従って掘削ロッド１の周りに水平回転自在となっている。そして、前記フランジ４ａどうしの締結部は掘削ロッド１の外径より外側に突出する前記突出体５を形成している。ここで、各フランジ４ａの角部分は、突出体５の地盤内への進入をスムースにするために切り欠いたカット面Ｐとされている。なお、この突出体５の形状やサイズは、後述のように、水硬性固化材液置換コラムの外周面に必要とする形態の突条部となるように、任意に決めることができる。   The cylindrical body 4 is provided with a pair of semi-cylindrical plates 4b having flat flanges 4a at the left and right ends, and these are arranged to surround the digging rod 1 so as to surround them. The flanges 4a are in contact with each other facing each other, and these contact portions are connected using fasteners 7 such as bolts and nuts. The inner diameter of the cylindrical body 4 composed of the flange 4a and the semi-cylindrical plate 4b is slightly larger than the outer diameter of the digging rod 1, and hence it is horizontally rotatable around the digging rod 1. And the fastening part of said flange 4a forms said protrusion 5 which protrudes outside the outer diameter of the digging rod 1. As shown in FIG. Here, the corner portion of each flange 4a is a cut surface P which is cut out in order to make the entry of the protrusion 5 into the ground smooth. In addition, the shape and size of this protrusion 5 can be arbitrarily determined so that it may become a protruding part of a form required for the outer peripheral surface of a hydraulic-hardening-solids liquid substitution column like the after-mentioned.

また、掘削ロッド１の外周面における円筒体４の装着部位には、この円筒体４のずれ止めとしての上下一対のリング状のずれ止め用突縁６ａ、６ｂが一体に固設され、これらの突縁６ａ、６ｂ間に、円筒体４が掘削ロッド１の周りで回転が自在であるものの、軸上下方向には移動しないように介在されている。   A pair of upper and lower ring-shaped anti-displacement flanges 6a and 6b as anti-displacement members of the cylindrical body 4 are integrally fixed to the attachment portion of the cylindrical rod 4 on the outer peripheral surface of the excavating rod 1. The cylindrical body 4 is interposed between the flanges 6 a and 6 b so as to be rotatable around the digging rod 1 but not to move in the axial vertical direction.

かかる構成になる水硬性固化材液置換コラム築造装置１Ｈでは、これを施工機（図示省略）に装着し、掘削ロッド１を正回転させながら地盤の所定の深度まで掘進させた後、吐出口２ｂから水硬性固化材液を吐出しながら、その掘削ロッド１を地上へ引き上げる。これにより水硬性固化材液を削孔の所定の天端レベル位置まで充填し、これが固化することで、突条体１２を有する水硬性固化材液置換コラム１１を築造できる。   In the hydraulic solidifying material liquid displacement column constructing apparatus 1H having such a configuration, this is attached to a construction machine (not shown), and after excavating to a predetermined depth of ground while rotating the drilling rod 1 forward, the discharge port 2b While the hydraulic solidifying material solution is discharged, the drilling rod 1 is pulled up to the ground. In this way, the hydraulic solidifying material liquid is filled up to a predetermined top end level position of the hole, and by solidifying it, the hydraulic solidifying material liquid displacement column 11 having the projection 12 can be constructed.

この場合において、円筒体４は、ずれ止め用突縁６ａ、６ｂによって軸上下方向移動が規制されて掘削ロッド１に回転自在に設けられ、かつ円筒体４の突出体５の回転径は、掘削ロッド１の径より大きいため、施工機（図示省略）に掘削ロッド１を取り付け、掘削ロッド１を回転しつつ地盤中に掘進して削孔すると、円筒体４の突出体５は、掘削ロッド１で削孔した削孔壁面より外側の地盤内に食い込み掘進する。この時、円筒体４には掘削ロッド１の回転力は伝わらないし、突出体５が削孔壁面より外側の地盤に食い込み回転が阻止されるので、掘削ロッド１が回転しても回転せずに掘進する。これにより円筒体４の突出体５が削孔壁面より外側の地盤内に食い込み掘進した削孔壁面には突出体５が食い込んで通過した軌跡として突出体５の形状に対応した軌跡空間として凹条が形成される。   In this case, movement of the cylindrical body 4 in the axial vertical direction is restricted by the anti-slip protrusions 6a and 6b, and the cylindrical rod 4 is rotatably provided on the digging rod 1, and the diameter of rotation of the protrusion 5 of the cylindrical body 4 is excavated. When the drilling rod 1 is attached to a construction machine (not shown) because it is larger than the diameter of the rod 1 and the drilling rod 1 is rotated while excavating into the ground by drilling, the protrusion 5 of the cylindrical body 4 is the drilling rod 1 Bite into the ground outside the wall surface of the drilled hole and drilled. At this time, the rotational force of the drilling rod 1 is not transmitted to the cylindrical body 4 and the protrusion 5 bites into the ground outside the drilling wall surface and rotation is blocked, so that the drilling rod 1 does not rotate even if it rotates. Dig in. Thereby, the protrusion 5 of the cylindrical body 4 bites into the ground on the outer side of the wall of the hole and digs into the ground of the drilled hole. Is formed.

従って、掘削ロッド１を所定深度まで掘進した後、掘削ヘッド２の吐出口２ｂより水硬性固化材液を吐出しつつ掘削ロッド１を回転して又は無回転で引き上げて削孔内の所定の天端レベル位置まで水硬性固化材液を填充すると、凹条にも水硬性固化材液が充填されるので、水硬性固化材液が固化すると、コラム１１外周側面に縦方向の突条部１２が本体と一体に形成された水硬性固化材液置換コラム１１が築造される。本例では、円筒体４の対称位置に突出体５が２個設けられているので、築造される水硬性固化材液置換コラム１１にも突条部１２が対称位置に２個設けられている。この突条部１２は、地盤との周面摩擦力によって水硬性固化材液置換コラム１１の鉛直支持力を増大させるものとなる。   Therefore, after drilling the drilling rod 1 to a predetermined depth, the drilling rod 1 is rotated or pulled up without rotation while discharging the hydraulic hardening solid solution from the discharge port 2b of the drilling head 2, and the predetermined sky in the drilling is When the hydraulic solidifying material liquid is filled up to the end level position, the concave part is filled with the hydraulic solidifying material liquid, so when the hydraulic solidifying material liquid solidifies, the ridges 12 in the longitudinal direction on the outer peripheral side of the column 11 A hydraulic solidifying material liquid displacement column 11 integrally formed with the main body is built. In this example, since two projections 5 are provided at symmetrical positions of the cylindrical body 4, two projections 12 are also provided at symmetrical positions in the hydraulic solidifying material liquid displacement column 11 to be built. . The ridges 12 increase the vertical supporting force of the hydraulic solidifying material liquid displacement column 11 due to the circumferential surface frictional force with the ground.

図２２は、本発明の第９実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｉを示す要部の一部切欠正面図、図２３は、図２２のＩ−Ｉ線断面図である。
この第９実施の形態の水硬性固化材液置換コラム築造装置１Ｉは、掘削ロッド１の下方部外周面にずれ止めとしてのリング切欠９を形成し、円筒体４を構成する前記一対の半円筒板４ｂをこのリング切欠９に遊嵌させたものであり、他は前記図２０および図２１に示す実施の形態と同様であるので、同様な構成要素には同一符号を付して他の詳細な説明は省略する。本例では、掘削ロッド１の下方部の所定領域を肉厚部８として、この肉厚部８にリング切欠９を設けた場合を示している。
このリング切欠９の深さは、円筒体４を構成する一対の半円筒板４ｂの肉厚より若干大きくしてあり、このリング切欠９に半円筒板４ｂを回転自在に遊嵌させたとき、半円筒板４ｂの外周面が掘削ロッド１の外周面と面一となるようになっている。
従って、この第９実施の形態では、半円筒板４ｂがリング切欠９内にあって、掘削ロッド１の外周面より外出することはなく、掘削ロッド１の外周面と面一となるので、掘進時および引き上げ時の地盤による抵抗がなくなるので好ましい。前記図２０および図２１の第８実施の形態では、ずれ止め用突縁６ａ、６ｂが掘削ロッド１の外周面より外出しているので、掘進時および引き上げ時に地盤抵抗として作用するおそれがある。また、僅かではあるが、掘削ロッド１で摺り付けて強化された孔壁を乱すおそれもある。
この第９実施の形態の水硬性固化材液置換コラム築造装置１Ｉにおいても、図２０および図２１に示す第８実施の形態と同様に、外周側面に縦方向の２条の突条部１２を有する水硬性固化材液置換コラム１１を築造できる。 FIG. 22 is a partially cutaway front view of the main part showing a hydraulic solidifying material liquid displacement column constructing apparatus 1I according to a ninth embodiment of the present invention, and FIG. 23 is a sectional view taken along the line II of FIG. .
A hydraulic solidifying material liquid displacement column construction apparatus 1I according to the ninth embodiment forms a ring notch 9 as a slip stopper on the outer peripheral surface of the lower portion of the digging rod 1, and forms the cylindrical body 4 by the pair of semicylinders. The plate 4b is loosely fitted in the ring notch 9, and the other parts are the same as those of the embodiment shown in FIGS. 20 and 21. Description is omitted. In this example, the case where the ring notch 9 is provided in the thick portion 8 is shown as a predetermined region of the lower portion of the drilling rod 1 as the thick portion 8.
The depth of the ring notch 9 is slightly larger than the thickness of the pair of semi-cylindrical plates 4 b constituting the cylindrical body 4, and when the semi-cylindrical plate 4 b is freely loosely fitted in the ring notch 9, The outer peripheral surface of the half-cylindrical plate 4 b is flush with the outer peripheral surface of the drilling rod 1.
Therefore, in the ninth embodiment, the semi-cylindrical plate 4 b is in the ring notch 9 and does not go out from the outer peripheral surface of the drilling rod 1 and is flush with the outer peripheral surface of the drilling rod 1. It is preferable because there is no resistance from the ground at the time and pulling up. In the eighth embodiment shown in FIGS. 20 and 21, since the shift preventing protrusions 6a and 6b are out of the outer peripheral surface of the digging rod 1, there is a possibility that they act as ground resistance at the time of digging and pulling. In addition, there is also a possibility that it may rub against the drill rod 1 to disturb the reinforced hole wall.
Similarly to the eighth embodiment shown in FIGS. 20 and 21, in the hydraulic solidifying material liquid replacement column constructing apparatus 1I of the ninth embodiment, two ridges 12 in the longitudinal direction are formed on the outer peripheral side surface. A hydraulic solidifying material liquid displacement column 11 can be constructed.

図２４は、本発明の第１０実施の形態にかかる水硬性固化材液置換コラム築造装置を示す要部の一部切欠正面図、図２５は、図２４Ｊ−Ｊ線断面図である。
この第１０実施形態の水硬性固化材液置換コラム築造装置１Ｊでは、図２０および図２１に示した一対のフランジ４ａ、４ａ間における各半円筒板４ｂの中央部に、平面視で略台形状の突起（突出体）１０が設けてある。この突起１０は回転径が各フランジ４ａと略等しく、かつその回転径が掘削ロッド１の径より大きい。なお、これらの突起１０の上下の角部分は、突起１０の地盤内への進入をスムースにするために切り欠かれたカット部Ｐとなっている。他は前記図２０および図２１に示す第８実施の形態と同様であるので、同様な構成要素には同一符号を付して他の詳細な説明は省略する。 FIG. 24 is a partially cutaway front view of the main part showing the hydraulic / solidifying material liquid displacement column constructing apparatus according to the tenth embodiment of the present invention, and FIG. 25 is a cross-sectional view of FIG.
The hydraulic solidifying material liquid displacement column construction apparatus 1J according to the tenth embodiment has a substantially trapezoidal shape in a plan view at the central portion of each half-cylindrical plate 4b between the pair of flanges 4a and 4a shown in FIGS. The projection (protrusion) 10 is provided. The diameter of rotation of this projection 10 is substantially equal to that of each flange 4 a, and the diameter of rotation is larger than the diameter of the drilling rod 1. The upper and lower corner portions of the projections 10 are cut portions P which are cut away in order to smooth the entrance of the projections 10 into the ground. The other parts are the same as those of the eighth embodiment shown in FIGS. 20 and 21, and therefore the same reference numerals are given to the similar components and the other detailed description will be omitted.

この実施の形態の水硬性固化材液置換コラム築造装置１Ｊでは、一対の半円筒板４ｂで形成する円筒体４には、突出体５と凸起（突出体）１０とで突出体が４個、円周上の４等分各位置に存在するので、この第１０実施の形態の水硬性固化材液置換コラム築造装置１Ｊを使用して水硬性固化材液置換コラムの築造を施工すると、掘削ロッド１を地盤中に掘進して形成する削孔内壁面には、削孔内壁面の４等分各位置に凹条が形成され、これに水硬性固化材液が填充される。従って、填充した水硬性固化材液が固化すると、コラム１１外周面の４等分の各位置に突条部１２を有する水硬性固化材液置換コラム１１が築造される。この水硬性固化材液置換コラム１１によれば、外周側面に突条部１２が４個存在するため周面摩擦力が増大し、結果、鉛直支持力のより高いものとなる。突起１０は、幅厚に形成されるため、硬化後の置換コラムに鉛直荷重が作用したときに破損するおそれがなく、確実に鉛直支持力を増大させることができる。   In the hydraulic / solidification material liquid displacement column construction apparatus 1J of this embodiment, four projections 5 and projections (projections) 10 form four projections on the cylinder 4 formed by the pair of semi-cylindrical plates 4b. Since the hydraulic solidifying material liquid displacement column constructing device 1J according to the tenth embodiment is used to construct a hydraulic solidifying material liquid displacement column, drilling is performed because it exists at four positions on the circumference. On the inner wall surface of the drilling formed by digging the rod 1 into the ground, concave streaks are formed at each position of the inner wall of the drilling inner wall and filled with a hydraulic solidifying material solution. Therefore, when the filled hydraulic solidifying material liquid solidifies, the hydraulic solidifying material liquid displacement column 11 having the ridge portions 12 at each position of 4 equal parts of the outer peripheral surface of the column 11 is constructed. According to the hydraulic solidifying material liquid displacement column 11, the circumferential surface frictional force is increased because four protrusions 12 are present on the outer peripheral side surface, and as a result, the vertical supporting force becomes higher. Since the projections 10 are formed to have a width, there is no risk of breakage when a vertical load acts on the cured replacement column, and the vertical supporting force can be reliably increased.

なお、図２０、図２１、図２２、図２３、図２４および図２５では、円筒体４を縦方向（垂直方向）に２分割したフランジ４ａを持つ半円筒板４ｂを、締結具７を用いて組み付けたものを示したが、必要に応じて円筒体４を３分割以上に分割したものとして、これらを、締結具７を用いて組み付けてもよい。かかる構成により突出体５や突起１０が増設されることとなり、地盤に対する水硬性固化材液置換コラム１１の鉛直支持力を更に高めることができる。   In FIG. 20, FIG. 21, FIG. 22, FIG. 23, FIG. 24 and FIG. 25, the half cylindrical plate 4b having the flange 4a obtained by dividing the cylindrical body 4 in the vertical direction (vertical direction) Although what was assembled and shown was shown, you may assemble | attach these using the fastener 7 as what divided the cylindrical body 4 into 3 or more as needed. With this configuration, the projections 5 and the projections 10 are additionally provided, and the vertical supporting force of the hydraulic solidifying material liquid displacement column 11 to the ground can be further enhanced.

前記第８乃至第１０実施の形態の円筒体４は２分割または３分割以上に分割したフランジ４ａを備える半円筒板４ｂを締結具７を用いて組み付けたものであるため、これらの掘削ロッド１への着脱が容易であり、突条部１２を持つ水硬性固化材液置換コラム１１を簡単、迅速に施工できる。また、分割したフランジ４ａを備える半円筒板４ｂを締結具７を用いて組み付けたものであるため、これらの組み付けまたは分割のための作業が容易となる。また、取り替えが容易にできるため、突出体が摩耗した時も円筒体４ごと容易に交換できる。   The cylindrical body 4 according to the eighth to tenth embodiments is a semi-cylindrical plate 4 b having a flange 4 a divided into two or three or more, and assembled by using the fastener 7. The hydraulic solidifying material liquid displacement column 11 having the projecting portion 12 can be easily and quickly installed. In addition, since the semi-cylindrical plate 4b provided with the divided flange 4a is assembled using the fastener 7, the work for assembling or dividing them becomes easy. Further, since the replacement is easy, even when the protrusion is worn, it can be easily replaced together with the cylindrical body 4.

円筒体４は掘削ロッド１の外周面に形成されたずれ止め用突縁６ａ、６ｂやリング切欠９などのずれ止めによって上下方向への移動が制限されているため、掘進及び引き上げ工程中に円筒体４の突出体５や突起１０が、これらのサイズや形状に応じた凹条を削孔内壁面に形成することとなる。そして、これらの凹条内に水硬性固化材液が充填されることで、縦長の突条部１２を水硬性固化材液置換コラム１１の外周に一体に設けることができる。   Since the movement of the cylindrical body 4 in the vertical direction is limited by the slip stoppers 6 a, 6 b and the ring notch 9 formed on the outer peripheral surface of the drilling rod 1, the cylinder during the digging and pulling process The projections 5 and the projections 10 of the body 4 form concave streaks corresponding to their size and shape on the inner wall surface of the drilling. Then, the hydraulic solidifying material solution is filled in these concave lines, so that the vertically elongated ridges 12 can be integrally provided on the outer periphery of the hydraulic solidifying material liquid displacement column 11.

図２６は、第１１実施の形態にかかる水硬性固化材液置換コラム築造装置を示す要部の正面図、図２７は、図２６のＫ−Ｋ線断面図、図２８は、前記第１１実施の形態にかかる水硬性固化材液置換コラム築造装置を用いて水硬性固化材液置換コラムを築造する様子を工程順（ａ）（ｂ）（ｃ）に示す断面図で、上段が断面正面図、下段が上段のＺ−Ｚ線断面図である。
この第１１実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｋは、掘削ロッド１の下方部外周面に円筒体４を回転自在に遊嵌し、この円筒体４の外周面に長方形の板状の突片５ｂからなる突出体５を４枚等間隔（９０度間隔）に固設したものであり、他は前記第１実施の形態と同様であるので、同様な構成要素には同一符号を付して他の詳細な説明は省略する。
この第１１実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｋにおいても、板状の突片５ｂで形成した４枚の突出体５の形状に対応した４条の凹条を削孔内壁面に形成でき、この削孔内に水硬性固化材液が填充されることでこれらの凹条にも填充され、この水硬性固化材液が固化することによって、その外周に突条部１２を有する水硬性固化材液置換コラム１１を築造できる。 FIG. 26 is a front view of the main part of the hydraulic solidifying material liquid displacement column constructing apparatus according to the eleventh embodiment, FIG. 27 is a sectional view taken along the line K-K in FIG. 26, and FIG. Fig. 6 is a cross-sectional view showing, in order of steps (a), (b) and (c), how the hydraulic solidifying material liquid displacement column is built using the hydraulic solidifying material liquid displacement column construction device according to The lower part is a Z-Z line sectional view of the upper part.
A hydraulic solidifying material liquid displacement column construction apparatus 1K according to the eleventh embodiment has the cylindrical body 4 rotatably loosely fitted on the outer peripheral surface of the lower portion of the drilling rod 1, and the outer peripheral surface of the cylindrical body 4 has a rectangular shape. Since four projections 5 consisting of plate-like projecting pieces 5b are fixed at equal intervals (90 degrees interval), and the others are similar to the first embodiment, the same constituent elements are the same. The reference numerals are attached and the other detailed description is omitted.
Also in the hydraulic solidifying material liquid displacement column constructing apparatus 1K according to the eleventh embodiment, the four concave streaks corresponding to the shape of the four projecting members 5 formed by the plate-like projecting pieces 5b are bored in the hole It is possible to form on the wall surface, and filling the hydraulic solidifying material liquid into the hole will also fill these concave streaks, and by solidifying the hydraulic solidifying material liquid, the ridge portion 12 is formed on the outer periphery thereof. A hydraulic solidifying material liquid displacement column 11 can be constructed.

この図２６および図２７に示す水硬性固化材液置換コラム築造装置１Ｋにおいて、円筒体４の下端より下方位置の掘削ロッド１を、掘削ロッド１の突き出し長ｈとし、掘削ロッド１の径をＤとする。
この水硬性固化材液置換コラム築造装置１Ｋを用いて図２８（ａ）に示すように掘進し、所定深度まで掘進した後、掘削ヘッド２の吐出口２ｂより水硬性固化材液を吐出しながら掘削ロッド１を回転して引き上げすると、該築造装置１Ｋの突出体５が通過した軌跡空間（凹条）に水硬性固化材液が満たされて突条部１２が形成されるが、この該築造装置１Ｋの突出体５が上方に向かって通過し凹条に水硬性固化材液が満たされ突条部１２が形成された後に、該突出体５より下方に存在する掘削ロッド１の突き出し部１ａが続いて回転しながら、前記突条部１２を切断するように上方に通過していく（図２８（ｂ））。この時、該掘削ロッド１の突き出し部１ａの側面に、図２８（ｂ）に示すように土砂Ｓが付着していたり、回転により周辺土砂Ｓを回転方向に共回りさせるような現象が発生する場合がある。従って、該突出体５が固設された円筒体４より下方の掘削ロッド１の突き出し部１ａが存在すると、掘削ロッド１の回転により図２８（ｃ）に示すように水硬性固化材液置換コラム１１の本体部と突条部１２の付け根部に周辺土砂Ｓを巻き込む場合があり、工程上この土砂Ｓを除去することができないので、そのまた水硬性固化材液が固化すると、この巻き込み土砂部が弱点となる。つまり、固化後の突条部１２を有する水硬性固化材液置換コラム１１が上部荷重を支える杭として支持力を発揮する際、突条部１２に作用する地盤の周面摩擦（支持）力を水硬性固化材液置換コラム１１本体に伝えることが出来ず、所望の効果を発揮することが出来ない。特に、掘削ロッド１の突き出し長ｈが大きいと、周辺土砂を巻き込む確率が高くなり、弱点の多い欠陥突条部付き水硬性固化材液置換コラム１１が築造されることになる。
従って、この掘削ロッド１の突き出し長ｈは、大きくとも掘削ロッド１の径Ｄの３倍以下、好ましくは２倍以下とする。そうすることにより掘削土砂Ｓの突条部１２付け根への巻き込み確率を低減することができる。
なお、前記では図２６および図２７に示す水硬性固化材液置換コラム築造装置１Ｋで説明したが、この掘削ロッド１の突き出し長ｈを、大きくとも掘削ロッド１の径Ｄの３倍以下、好ましくは２倍以下とすることは、本発明における水硬性固化材液置換コラム築造装置の全てについていえることである。 In the hydraulic solidified material liquid displacement column construction apparatus 1K shown in FIGS. 26 and 27, the digging rod 1 located below the lower end of the cylindrical body 4 is the projecting length h of the digging rod 1 and the diameter of the digging rod 1 is D I assume.
As shown in FIG. 28 (a), the hydraulic solidifying material liquid displacement column construction apparatus 1K is used to dig and advance to a predetermined depth, and then the hydraulic solidifying material liquid is discharged from the discharge port 2b of the drilling head 2 When the drilling rod 1 is rotated and pulled up, the hydraulic solidifying material liquid is filled in the locus space (concave line) through which the protrusion 5 of the construction device 1K passes, and the projection 12 is formed. After the protrusion 5 of the apparatus 1 K passes upward and the recessed line is filled with the hydraulic solidifying agent liquid and the protrusion 12 is formed, the protrusion 1 a of the digging rod 1 present below the protrusion 5 is formed. Continues to rotate, and passes upward to cut the protrusion 12 (FIG. 28 (b)). At this time, as shown in FIG. 28 (b), the soil S adheres to the side surface of the protruding portion 1a of the drilling rod 1 or a phenomenon occurs such that the peripheral soil S rotates together in the rotation direction by rotation. There is a case. Therefore, when the protrusion 1a of the drilling rod 1 below the cylindrical body 4 to which the protrusion 5 is fixed is present, the hydraulic solidifying material liquid replacement column is shown by FIG. 28 (c) by the rotation of the drilling rod 1. The surrounding soil S may be caught in the base portion of the 11 and the ridge of the ridge portion 12 and this sand S can not be removed in the process, so when the hydraulic solidifying material liquid solidifies, the rolled sand portion Is a weak point. That is, when the hydraulic solidifying material liquid displacement column 11 having the ridges 12 after solidification exerts a supporting force as a pile supporting the upper load, the circumferential friction (support) force of the ground acting on the ridges 12 It can not be transmitted to the hydraulic solidifying material liquid displacement column 11 main body, and a desired effect can not be exhibited. In particular, when the projection length h of the drilling rod 1 is large, the probability of catching in the surrounding earth and sand becomes high, and a hydraulic solidifying material liquid displacement column 11 with a defect ridge portion having many weaknesses is built.
Therefore, the protrusion length h of the drill rod 1 is at most 3 times or less, preferably 2 times or less the diameter D of the drill rod 1. By doing so, it is possible to reduce the probability of the excavated soil S being caught in the ridge 12.
Although the hydraulic solidifying material liquid displacement column constructing apparatus 1K shown in FIGS. 26 and 27 has been described above, the protrusion length h of the drilling rod 1 is preferably at most 3 times the diameter D of the drilling rod 1 at most. That is not more than twice is true for all of the hydraulic solidifying material liquid displacement column construction apparatuses in the present invention.

図２９は、第１２実施の形態にかかる水硬性固化材液置換コラム築造装置を示す要部の正面図、図３０は、図２９のＬ−Ｌ線断面図である。
この第１２実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｌは、掘削ロッド１の下方部外周面に円筒体４を回転自在に遊嵌し、この円筒体４の外周面に長方形の突片５ｂで形成した突出体５を３枚等間隔（１２０度間隔）に固設し、突出体５より下方に存在する掘削ロッド１の突き出し部１ａのロッド径を径小としたものであり、他は前記第１の実施の形態と同様であるので、同様な構成要素には同一の符号を付して他の詳細な説明は省略する。 FIG. 29 is a front view of an essential part of a hydraulic solidifying material liquid displacement column constructing apparatus according to a twelfth embodiment, and FIG. 30 is a sectional view taken along the line L-L in FIG.
The hydraulic solidifying material liquid displacement column construction apparatus 1L according to the twelfth embodiment has the cylindrical body 4 rotatably loosely fitted on the outer peripheral surface of the lower portion of the digging rod 1, and the outer peripheral surface of the cylindrical body 4 has a rectangular shape. Three projections 5 formed by the projections 5b are fixed at equal intervals (120 degrees apart), and the rod diameter of the projection 1a of the drilling rod 1 present below the projections 5 is reduced. The other components are the same as those of the first embodiment, so the same reference numerals are given to the similar components and the other detailed description will be omitted.

この第１２実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｌにおいても、板状の突片５ｂで形成した３枚の突出体５の形状に対応した３条の凹条を削孔内壁面に形成でき、この削孔内に水硬性固化材液が填充されることでこれらの凹条にも填充され、この水硬性固化材液が固化することによって、その外周に突条部１２を有する水硬性固化材液置換コラム１１を築造できる。
特に、この水硬性固化材液置換コラム築造装置１Ｌは、突出体５より下方に存在する掘削ロッド１の突き出し部１ａのロッド径が径小となっているので、掘削ロッド１の引き上げ時に、この突き出し部１ａのロッドは、形成された削孔径より径小なので孔壁面に接触することがない。従って、掘削ロッド１の引き上げ時に、削孔壁面に形成された凹条を突き出し部１ａのロッドで擦り潰すことがなく、凹条の形状が保持されるので、水硬性固化材液を填充し硬化後は、突条部が確実に形成される。
また、上記したような掘削ロッド１の突き出し部１ａのロッドに土砂が付着したり、回転により周辺土砂Ｓを回転方向に共回りさせるような現象が発生しても、水硬性固化材液置換コラム１１の本体部と突条部１２の付け根部に周辺土砂Ｓを巻き込むことを防止できる。
なお。本例の図２９では、突出体５を有する円筒体４は、掘削ロッド１の径小の突き出し部１ａ側に遊嵌されている場合で示しているが、掘削ロッド１側に遊嵌されていてもよい。要は、突出体５の位置より下方のロッドが径小となっていれば、上記作用、効果を奏するのでよいことになる。 Also in the hydraulic solidifying material liquid displacement column constructing apparatus 1L according to the twelfth embodiment, the three concave streaks corresponding to the shape of the three projecting bodies 5 formed by the plate-like projecting pieces 5b are bored in the hole It is possible to form on the wall surface, and filling the hydraulic solidifying material liquid into the hole will also fill these concave streaks, and by solidifying the hydraulic solidifying material liquid, the ridge portion 12 is formed on the outer periphery thereof. A hydraulic solidifying material liquid displacement column 11 can be constructed.
In particular, since the rod diameter of the protruding portion 1 a of the drilling rod 1 existing below the projecting body 5 is small in diameter, the hydraulic solidifying material liquid displacement column constructing device 1 L has a small diameter when pulling up the drilling rod 1. The rod of the protruding portion 1a does not come in contact with the hole wall surface because the diameter is smaller than the formed hole diameter. Therefore, when pulling up the drilling rod 1, the groove formed in the wall surface of the hole is not crushed by the rod of the protruding portion 1a and the shape of the groove is maintained, so the hydraulic solidifying material liquid is filled and hardened. After that, the ridges are formed reliably.
Even if earth and sand adheres to the rod of the protruding portion 1a of the drilling rod 1 as described above or rotation of the earth and sand S is caused to rotate together, the hydraulic solidifying material liquid replacement column It is possible to prevent the surrounding earth and sand S from being caught in the base portion of 11 and the root portion of the projecting portion 12.
In addition. In FIG. 29 of this example, the cylindrical body 4 having the protrusion 5 is shown as being loosely fitted to the small diameter projecting portion 1a side of the drilling rod 1, but loosely fitted to the drilling rod 1 side. May be The point is that if the diameter of the rod below the position of the projection 5 is small, the above-described action and effect can be achieved.

また、掘削ヘッドの形態は、特に制限はなく、従来公知のものが採用可能であるが、好ましい例として、掘削ロッド正回転時に掘削土砂を上方に押し上げる方向のスパイラル翼を固設した円錐形状の掘削ヘッド及び円錐ヘッドの周面に沿う縦方向の突条を設けた掘削ヘッドを示すことができる。
本実施の形態では、下方に向かって径小になる円錐形状の円錐ヘッド２であり、その周面には掘削ロッド１正回転時に掘削土砂を上方に押し上げる方向にスパイラル翼（螺旋状掘削翼）２ａが固設され、このスパイラル翼２ａと重複しない位置に水硬性固化材液の吐出口２ｂが設けられている掘削ヘッド２を示している。
この掘削ヘッド２であると、地盤における掘進性がよく、掘削部での土塊形成が物理的に生じない。特に、僅かではあるがスパイラル翼２ａ部に付着した土砂を支持する働きがあるため、付着土砂の落下を防止するので、水硬性固化材液置換コラム中に施工による掘削土塊の混入の恐れがないので好ましい。 In addition, the form of the drilling head is not particularly limited, and conventionally known ones can be adopted, but as a preferred example, it is a conical shape in which a spiral wing in a direction to push up the digging earth is upwardly fixed at the time of forward rotation of the drilling rod. A drilling head may be shown having a longitudinal ridge along the circumference of the drilling head and the conical head.
In the present embodiment, it is a conical cone head 2 whose diameter decreases in the downward direction, and a spiral wing (helical digging wing) in the direction of pushing up the excavated earth and sand upward at the time of forward rotation of the drilling rod 1 on its circumferential surface. The drilling head 2 is shown in which 2a is fixed and the discharge port 2b of the hydraulic hardener liquid is provided at a position not overlapping with the spiral wing 2a.
In the case of this drilling head 2, drilling ability in the ground is good, and the formation of soil mass in the drilling portion does not physically occur. In particular, since it has a function to support the earth and sand adhering to the spiral wing 2a although it is slight, it prevents the falling of the earth and sand attached, so there is no risk of mixing of excavated soils during construction in the hydraulic solidifying agent liquid replacement column. So preferred.

図３１は、下方に向かって径小になる円錐形状の円錐ヘッドであり、その周面に沿って縦方向の突条２ｃが複数（本例では４個）設けられ、この突条２ｃと重複しない部分に水硬性固化材液の吐出口２ｂが設けられている掘削ヘッド２を示している。
この突条２ｃは、回転して地盤中に掘進する際に、地盤を掘削し掘進性を向上させるものであるので、少なくとも１個存在すればよいが、複数を設けると掘削刃となる突条２ｃが増えることになり、かつ掘削回転時のバランスも良くなるので掘削性能が向上し好ましい。本例では外周に４個が等間隔で設けられている場合を示している。
突条２ｃは、回転して地盤中に掘進する際に、地盤を掘削できる構成であればよく、特に制限はない。本例では長方形の板状部材を円錐ヘッド２の周面に沿って縦方向（軸線方向）に立設した場合を示している。この突条２ｃの回転径は、掘削ロッド１の回転径以下とする。
この掘削ヘッド２においては、周面に沿う縦方向の突条２ｃが設けられた円錐形状であるので、突条２ｃでの地盤の掘削が良好に行われ、突条２ｃで掘削した土砂は、突条２ｃで案内され円錐ヘッド２の周面傾斜に沿って上方に移動させつつ地盤中に掘進できるので、掘進性能が向上し、施工性がよくなる。 FIG. 31 shows a conical cone head which decreases in diameter downward, and a plurality (four in the present example) of ridges 2c in the longitudinal direction are provided along the circumferential surface, and these ridges 2c overlap The drilling head 2 is shown in which the discharge port 2b of the hydraulic solidifying material liquid is provided in the non-portion.
Since this protrusion 2c is intended to excavate the ground and improve digmability when rotating and digging into the ground, at least one should be present, but a plurality of protrusions will serve as a digging blade The drilling performance is improved because 2c is increased and the balance at the time of drilling rotation is also improved, which is preferable. In this example, the case where four pieces are provided at equal intervals on the outer periphery is shown.
The protrusion 2c is not particularly limited as long as the ground can be excavated when it is rotated and excavated into the ground. In this example, the case where the rectangular plate-like member is provided in the vertical direction (axial direction) along the circumferential surface of the conical head 2 is shown. The diameter of rotation of the protrusion 2 c is equal to or less than the diameter of rotation of the drilling rod 1.
In this excavating head 2, since it has a conical shape provided with vertical ridges 2 c along the circumferential surface, excavation of the ground by the ridges 2 c is favorably performed, and the soil excavated by the ridges 2 c is Since it can be excavated in the ground while being guided upward by the ridges 2c and moved upward along the peripheral surface inclination of the conical head 2, the digging performance is improved and the workability is improved.

次に、以上のような水硬性固化材液置換コラム築造装置１Ａ、１Ｂ、１Ｃ、１Ｄ、１Ｅ、１Ｆ、１Ｇ、１Ｈ、１Ｉ、１Ｊ、１Ｋ、１Ｌを使用して、突条部を有する水硬性固化材液置換コラムの築造方法を、図３２について説明する。図３２は、水硬性固化材液置換コラム築造装置による築造方法を工程順（ａ）（ｂ）（ｃ）（ｄ）（ｅ）（ｆ）に示す説明図である。この水硬性固化材液置換コラムの築造方法は、前記いずれの実施の形態にかかる水硬性固化材液置換コラム築造装置を用いても同様であるので、本例では総称して単にコラム築造装置Ａと称し説明する。このコラム築造装置Ａは、掘削ロッド１の下端に掘削ヘッド２を有し、掘削ロッド１の下方部の外周面には円筒体４が回転自在に遊嵌され、その円筒体４の外周面には４枚の突出体５が等間隔で固設されている。掘削ヘッド２は、下方に向かって径小になる円錐状の円錐ヘッドであり、その周面に掘削ロッド１正回転時に掘削土砂を上方に押し上げる方向にスパイラル翼（螺旋状掘削翼）２ａが固設され、このスパイラル翼２ａと重複しない位置に水硬性固化材液の吐出口２ｂが設けられている。   Next, using the hydraulic solidifying material liquid displacement column construction apparatus 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J, 1K, 1L as described above, water having a ridge portion A method of constructing a hard solidified material liquid displacement column will be described with reference to FIG. FIG. 32 is an explanatory view showing a method of constructing with a hydraulic solidifying material liquid displacement column constructing device in order of steps (a) (b) (c) (d) (e) (f). The method of constructing the hydraulic solidifying material liquid displacement column is the same as in the hydraulic solidifying material liquid displacement column construction device according to any of the above-described embodiments, so in this example, the column construction device A is simply referred to generically. It is called and explained. The column construction apparatus A has a digging head 2 at the lower end of the digging rod 1, and a cylindrical body 4 is rotatably loosely fitted on the outer peripheral surface of the lower portion of the drilling rod 1. The four projections 5 are fixed at equal intervals. The drilling head 2 is a conical cone head which decreases in diameter downward, and a spiral wing (helical drilling wing) 2a is fixed on the circumferential surface thereof in a direction to push the excavated soil upward when the drilling rod 1 rotates forward. The discharge port 2b of the hydraulic hardener liquid is provided at a position which is provided and does not overlap with the spiral wing 2a.

（ａ）まず、コラム築造装置Ａの掘削ロッド１を打設位置にセットする（図３２（ａ））。
（ｂ）（ｃ）次に、掘削ロッド１を正回転させながら、掘進する（図３２（ｂ）（ｃ））。この時、掘削ロッド１の先端に接続している掘削ヘッド２の吐出口２ｂからの水硬性固化材液の吐出は必須ではない。ここでは掘削ロッド１を回転させても、その外周面に突出体５を固設した円筒体４は、掘削ロッド１に対して回転自在に遊嵌されているため、回転力が伝わらないので、地中では地盤抵抗を受けて回転せずに掘削ロッド１の掘進とともに地中に進入する。この進入では円筒体４の突出体５は、先端に掘削ヘッド２を有する掘削ロッド１が削孔した削孔内壁面より外側の地盤内に食い込み進入する。これにより円筒体４の突出体５が削孔内壁面より地盤中に食い込み進入した削孔壁面には、突出体５が通過した軌跡空間が凹条１３に残存する。その後、該軌跡空間である凹条１３は、地盤の弾性戻り等によって縮小するが、地盤条件によって縮小する程度は変化する。
（ｄ）掘削ロッド１先端が所定深度に達したら、掘削ロッド１先端に接続している掘削ヘッド２の吐出口２ｂから水硬性固化材液を吐出しながら掘削ロッド１の引き上げを開始する（図３２（ｄ））。
（ｅ）引き上げ時に、掘削ロッド１の回転は必須ではないが、回転したほうが施工効率が向上する。また、掘削ヘッド２にスパイラル翼２ａを固設している場合は、わずかではあるが付着土砂が落下する恐れがあるので、正回転で引き上げる方が好ましい。掘進時と同様に、引き上げ時も突出体５が固設された円筒体４は回転せずに、掘削ロッド１とともに上方へ引き上げられる。このとき、吐出された水硬性固化材液の液面位置が、低くとも突出体５が固設された円筒体４の下端部にあるように掘削ロッド１の引き上げ速度と水硬性固化材液の吐出量を調整するのが好ましい。これは該突出体５が形成する軌跡空間である凹条１３が形成されると同時に水硬性固化材液で該凹条１３を満たすことにより、地盤の弾性戻り等により発生する凹条（軌跡空間）１３の縮小をより小さくする効果があるためである（図３２（ｅ））。
（ｆ）掘削ロッド１を完全に地上に引上げ、水硬性固化材液の液面を所定位置（天端レベル位置）に調整して施工を終了する（図３２（ｆ））。これにより填充した水硬性固化材液が固化（硬化）することによって、外周面に突条部１２が一体に形成された水硬性固化材液置換コラム１１が築造される。 (A) First, the drilling rod 1 of the column construction device A is set at the placement position (FIG. 32 (a)).
(B) (c) Next, digging is performed while rotating the drilling rod 1 forward (Fig. 32 (b) (c)). At this time, the discharge of the hydraulic solidifying material solution from the discharge port 2b of the drilling head 2 connected to the tip of the drilling rod 1 is not essential. Here, even if the drilling rod 1 is rotated, the cylindrical body 4 having the protrusion 5 fixed to the outer peripheral surface thereof is rotatably fitted to the drilling rod 1 so that the rotational force is not transmitted. In the ground, it receives ground resistance and enters the ground as it digs the drilling rod 1 without rotating. In this approach, the protrusion 5 of the cylindrical body 4 bites into and enters the ground outside the drilling inner wall surface where the drilling rod 1 having the drilling head 2 at its tip drills. As a result, on the wall surface of the drilled hole where the protrusion 5 of the cylindrical body 4 bites into the ground from the inner wall surface of the drilled hole, the trace space through which the protrusion 5 has passed remains on the concave streak 13. Thereafter, although the concave streak 13 which is the locus space is reduced due to elastic return of the ground or the like, the degree of reduction varies depending on the ground conditions.
(D) When the tip of the drilling rod 1 reaches a predetermined depth, pulling up of the drilling rod 1 is started while discharging the hydraulic solidifying material solution from the discharge port 2b of the drilling head 2 connected to the tip of the drilling rod 1 (see FIG. 32 (d)).
(E) At the time of pulling up, rotation of the drilling rod 1 is not essential, but the rotation improves the construction efficiency. In addition, when the spiral wing 2a is fixed to the drilling head 2, it is preferable to pull it up by normal rotation because there is a risk that attached soil may fall though it is small. As in the case of digging, the cylindrical body 4 on which the protrusion 5 is fixed is pulled up together with the digging rod 1 without rotating even when pulling up. At this time, the pull-up speed of the drilling rod 1 and the hydraulic solidifying material liquid so that the liquid level position of the discharged hydraulic solidifying material liquid is at least at the lower end of the cylindrical body 4 on which the projecting body 5 is fixed. It is preferable to adjust the discharge amount. This is a locus space formed by the protrusion 5 and at the same time the groove 13 is filled with the hydraulic solidifying material liquid, thereby forming the indentation (the locus space due to elastic return of the ground, etc. The reason is that there is an effect of making the reduction of 13 smaller (FIG. 32 (e)).
(F) The digging rod 1 is completely pulled up to the ground, the liquid level of the hydraulic solidifying material solution is adjusted to a predetermined position (top end level position), and the construction is completed (FIG. 32 (f)). As a result, the filled hydraulic solidifying material solution solidifies (hardens), thereby constructing the hydraulic solidifying material liquid displacement column 11 in which the ridges 12 are integrally formed on the outer peripheral surface.

この水硬性固化材液置換コラム築造方法で築造される水硬性固化材液置換コラムは、前記したように水硬性固化材液置換コラム築造装置における円筒体４の外周面に固設した突出体５の形状、数および位置に対応した突条部を有するコラムとなる。
例えば、図１および図２に示す第１実施の形態にかかる水硬性固化材液置換コラム築造装置１Ａによれば、突出体５はブロック状で、対称位置に２枚設けられているので、削孔壁面に形成される突出体５の軌跡空間で形成する凹条１３は、該ブロック状の突出体５の形状、数および位置に対応するので、図３３（ａ）に示すようにブロック状の突出体５の形状に対応する形状の突条部１２が対称位置に２個有する水硬性固化材液置換コラム１１が築造される。突出体５は、ブロック状なので幅厚の凹条に形成されるため、填充した水硬性固化材液が硬化後の置換コラムに鉛直荷重が作用したときに破損するおそれがなく、確実に鉛直支持力を増大させることができる。
また、図６および図７に示す第２実施の形態にかかる水硬性固化材液置換コラム築造装置１Ｂによれば、突出体５は２枚の長方形の板状の突片５ｂで形成されているので、削孔壁面に形成される突出体５の軌跡空間で形成する凹条１３は、該長方形の板状の突片５ｂで形成される突出体５の形状、数、位置に対応するので、図３３（ｂ）に示すように板状の突片５ｂの形状および数、位置に対応する形状、および数、位置の突条部１２を有する水硬性固化材液置換コラム１１が築造される。
以下、同様にして図３４（ａ）（ｂ）（ｃ）に例示するように突出体５の形状、数および位置に対応した突条部１２を有する水硬性固化材液置換コラム１１を築造することができる。 The hydraulic solidifying material liquid displacement column constructed by the hydraulic solidifying material liquid displacement column construction method is the projecting body 5 fixed on the outer peripheral surface of the cylindrical body 4 in the hydraulic solidifying material liquid displacement column construction device as described above. The column has a protrusion corresponding to the shape, number and position of the
For example, according to the hydraulic / solidifying material liquid displacement column construction apparatus 1A according to the first embodiment shown in FIGS. 1 and 2, since the protrusions 5 are block-shaped and provided at two symmetrical positions, Since the groove 13 formed by the locus space of the protrusion 5 formed on the hole wall corresponds to the shape, the number and the position of the block-shaped protrusion 5, as shown in FIG. A hydraulic solidifying material liquid displacement column 11 is constructed, which has two projecting ridges 12 having a shape corresponding to the shape of the projecting body 5 at symmetrical positions. Since the projections 5 are block-shaped and formed into concave streaks of a wide thickness, there is no possibility that the filled hydraulic solidifying material liquid is damaged when a vertical load is applied to the cured replacement column, and the vertical support can be reliably supported. The power can be increased.
Further, according to the hydraulic / solidifying material liquid displacement column construction apparatus 1B according to the second embodiment shown in FIG. 6 and FIG. 7, the protrusion 5 is formed of two rectangular plate-like protruding pieces 5b. Because the groove 13 formed in the trajectory space of the protrusion 5 formed on the wall surface of the hole corresponds to the shape, number, and position of the protrusion 5 formed of the rectangular plate-like protrusion 5b, As shown in FIG. 33 (b), the hydraulic solidifying material liquid displacement column 11 having the ridge portions 12 in the shape, number, and position corresponding to the shape, number, and position of the plate-like protruding pieces 5b is constructed.
Similarly, as shown in FIGS. 34 (a), (b) and (c), a hydraulic solidifying material liquid displacement column 11 having projecting ridges 12 corresponding to the shape, number and position of the protrusions 5 is constructed. be able to.

このように本発明の実施の形態にかかる水硬性固化材液置換コラム築造装置によれば、図３３および図３４に示すような外周面の上下方向に略真直ぐ延びる突条部１２を一体に有する水硬性固化材液置換コラム１１が築造でき、突条部１２の形状、サイズ、数および位置は、前記突出体５の形態、数および位置に対応するものとなる。図３３（ａ）は先端円弧状で矩形の断面形状の突条部１２が２個対称位置に設けられている水硬性固化材液置換コラム１１を示し、図３３（ｂ）は、矩形の断面形状の突条部１２が２個対称位置に設けられている水硬性固化材液置換コラム１１を示している。また、図３４（ａ）は、台形の断面形状の突条部１２が４個等間隔（９０度間隔）で設けられているものを示し、図３４（ｂ）は、矩形の断面形状の突条部６個が等間隔（６０度間隔）で６個設けられているものを示し、図３４（ｃ）は、略半円形の断面形状の突条部１２が等間隔（９０度間隔）で４個設けられているものを示している。これらは単に例示であって、突出体５の形状、サイズ、数および位置等を種々に選択することで、所望の突条部１２の形態の水硬性固化材液置換コラム１１を築造できる。
そして、本発明にかかる水硬性固化材液置換コラム築造装置で築造した水硬性固化材液置換コラム１１は、周面に縦方向（軸線方向）の突条体５が一体に設けられているので、地盤に対する周面摩擦力が増大し、水硬性固化材液置換コラム１１の鉛直支持力を高めることができる。従って、構造物単位での水硬性固化材液置換コラム１１の打設本数を削減でき、経済的施工が可能になる。 As described above, according to the hydraulic / solidifying material / liquid displacement column constructing apparatus in accordance with the embodiment of the present invention, as shown in FIG. 33 and FIG. 34, the ridge 12 extending substantially straight in the vertical direction of the outer peripheral surface is integrally provided. The hydraulic solidifying material liquid displacement column 11 can be built, and the shape, size, number and position of the ridges 12 correspond to the shape, number and position of the protrusions 5. FIG. 33 (a) shows a hydraulic solidifying material liquid displacement column 11 in which two projecting ridges 12 of arc-shaped tip and rectangular cross-sectional shape are provided at symmetrical positions, and FIG. 33 (b) is a rectangular cross-section A hydraulic solidifying material liquid displacement column 11 is shown in which two projecting ridges 12 of a shape are provided at symmetrical positions. Further, FIG. 34 (a) shows that four ridges 12 having a trapezoidal cross-sectional shape are provided at equal intervals (90 ° intervals), and FIG. 34 (b) shows a rectangular cross-sectional protrusion FIG. 34 (c) shows that the ridges 12 having a substantially semicircular cross-sectional shape are equally spaced (90 degrees apart). It shows what is provided four. These are merely examples, and by selecting the shape, size, number, position, etc. of the protrusions 5 variously, it is possible to construct the hydraulic solidifying material liquid displacement column 11 in the form of the desired protruding portion 12.
And, because the hydraulic solidifying material liquid substitution column 11 built by the hydraulic solidifying material liquid substitution column constructing device according to the present invention has the projecting member 5 in the longitudinal direction (axial direction) integrally provided on the circumferential surface The circumferential surface frictional force to the ground increases, and the vertical supporting force of the hydraulic solidifying material liquid displacement column 11 can be enhanced. Accordingly, the number of hydraulic solidifying material liquid displacement columns 11 can be reduced by the number of structural units, and economical construction becomes possible.

また、本発明においては、前記実施の形態で示した通り、円筒体４は、掘削ロッド１に遊嵌されているので、掘削ロッド１を正回転しながら地盤中に掘進乃至引き上げしていくとき、これら相互の接触部に多少の接触抵抗が働いて、円筒体４は掘削ロッド１の回転に遅れてゆっくり回転することがある。この場合には、突出体５で削孔内壁面に突出体５の軌跡空間で形成される凹条１３は、縦方向に真っ直ぐに形成されることなく、円筒体４が少しではあるが回動しつつ掘進した分、曲がった凹条１３に形成される。従って、水硬性固化材液置換コラム１１の外周面に突設される突条部１２は、図３５（ａ）（ｂ）および図３６（ａ）（ｂ）に示すように、上部から下部にかけて曲がった形態となる。かかる曲がった突条部１２もまた地盤に対する周面摩擦力が増大し、水硬性固化材液置換コラム１１の鉛直支持力を高めることができる。
図３５（ａ）（ｂ）は、突条部１２が断面矩形状の場合を示し、図３６（ａ）（ｂ）は、突条部１２が略半円状の断面形状の場合を示している。それぞれの図において（ａ）（ｂ）では、突条部１２の曲がり方向が逆のものを示しており、掘削ロッド１の進行方向と回転方向によって異なることになる。例えば、掘削ロッド１の進行方向に対して回転方向が正回転のときは（ａ）となり、逆回転のときは（ｂ）となる。 Further, in the present invention, as shown in the above-mentioned embodiment, since the cylindrical body 4 is loosely fitted to the drilling rod 1, when digging or pulling up the ground into the ground while rotating the drilling rod 1 forward. Some contact resistance acts on these mutual contact parts, and the cylinder 4 may rotate slowly behind the rotation of the drilling rod 1. In this case, the groove 13 formed by the projection 5 on the inner wall surface of the hole in the hole surface by the locus space of the projection 5 is not formed straight in the longitudinal direction, and the cylinder 4 is turned although it is a little While cutting, it is formed in the bent concave line 13 by the amount which it advanced. Therefore, as shown in FIGS. 35 (a) and (b) and FIGS. 36 (a) and (b), the ridges 12 provided on the outer peripheral surface of the hydraulic solidifying material liquid displacement column 11 project from the upper portion to the lower portion. It becomes a bent form. Such curved ridges 12 also increase the circumferential surface friction against the ground, and can enhance the vertical supporting force of the hydraulic solidifying material liquid displacement column 11.
35 (a) and 35 (b) show the case where the ridge 12 is rectangular in cross section, and FIGS. 36 (a) and 36 (b) show the case where the ridge 12 has a substantially semicircular cross section. There is. In each of the drawings (a) and (b), the bending direction of the protruding portion 12 is shown to be opposite, and it differs depending on the traveling direction and the rotation direction of the drilling rod 1. For example, when the direction of rotation is positive rotation with respect to the advancing direction of the digging rod 1, it becomes (a), and when reverse rotation it becomes (b).

なお、前記実施の形態では、掘削ロッド１として周面が平滑な円筒状の掘削ロッドで記載しているが、本発明は、他のスパイラルオーガ、一部にスパイラルスクリュー翼を備える掘削ロッドや短尺円筒状掘削ロッドでも実施可能であるので、本発明の掘削ロッドとは、このような実施可能な掘削ロッドも含む意味で使用している。   In the above embodiment, although the drilling rod 1 is described as a cylindrical drilling rod having a smooth circumferential surface, the present invention is not limited to the other spiral auger, a drilling rod having a spiral screw blade in part, or a short length. As a cylindrical drilling rod can also be implemented, the drilling rod of the present invention is used to include such a possible drilling rod.

以上のように、本発明の実施の形態によれば、水硬性固化材液の流路１ｄを有する掘削ロッド１の下端部に、その流路１ｄに通じる吐出口２ｂを有する掘削ヘッド２を接続し、前記掘削ロッド１の下方部に、回転径が該掘削ロッド１径よりも大きい突出体５を有する円筒体４を、該掘削ロッド１の周りに回転自在に遊嵌させたことにより、掘削ロッド１を回転させながら地盤中に掘進させても、その外周面に突出体５を固設した円筒体４には回転力は伝わらないので、地中では地盤抵抗を受けて回転せずに掘削ロッド１の掘進とともに地中に進入し、この進入では円筒体４の突出体５は、先端に掘削ヘッド２を有する掘削ロッド１が削孔した削孔内壁面より外側の地盤内に食い込み進入するから、これにより円筒体４の突出体５が削孔内壁面より地盤中に食い込み進入した削孔内壁面には、突出体５が通過した軌跡空間が縦方向（孔底方向）の凹条１３に形成される。掘削ロッド１引き上げ時に、突出体５が掘進時の軌跡中を通過すれば凹条１３孔壁は再び練り付けられてより強固になるし、新たな軌跡の凹条１３を形成すれば、形成直後に水硬性固化材液が凹条１３に填充されるので確実に突条部１２が形成されるのみならず、掘進時に形成された凹条１３にも水硬性固化材液が填充されるため、硬化後の突条部数が増加して、これに伴い置換コラムの鉛直支持力も増大する。従って、所定深度に達したら掘削ヘッド２の吐出口２ｂより水硬性固化材液を吐出しつつ掘削ロッド１を地上に引き上げることで削孔内に水硬性固化材液が填充され、前記凹条１３内も水硬性固化材液で満たされるため、該水硬性固化材液が固化すると、外周面に縦方向に延びる突条部１２が一体に形成された水硬性固化材液置換コラム１１が築造される。これにより水硬性固化材液置換コラム１１は外周に縦方向に延びる突条部１２を有するため、周辺地盤における周面摩擦力が増大し、水硬性固化材液置換コラム１１の鉛直支持力を増大することができる。   As described above, according to the embodiment of the present invention, the drilling head 2 having the discharge port 2b communicating with the flow path 1d is connected to the lower end portion of the drilling rod 1 having the flow path 1d of the hydraulic solidifying material liquid And the cylindrical body 4 having the protrusion 5 whose rotation diameter is larger than the diameter of the drilling rod 1 is freely loosely fitted around the drilling rod 1 so that Even if you dig into the ground while rotating the rod 1, the rotational force is not transmitted to the cylindrical body 4 whose projections 5 are fixed on the outer peripheral surface, so it receives ground resistance and does not rotate in the ground. The rod 1 penetrates into the ground as the rod 1 advances, and in this approach, the protrusion 5 of the cylindrical body 4 bites into the ground outside the inner wall surface of the drilling bored by the drilling rod 1 having the drilling head 2 at its tip From this, the projecting body 5 of the cylindrical body 4 is thereby drilled on the inner wall surface Ri is the ingress were drilled inner wall surface bites into the ground, the trajectory space in which protruding member 5 passes is formed in the concave 13 in the vertical direction (the bottom of the hole direction). When pulling up the drilling rod 1, if the projection 5 passes through the track during digging, the concave 13 hole wall is kneaded again and becomes stronger, and if the concave 13 of the new track is formed, immediately after formation Since the hydraulic solidifying material solution is filled into the concave streaks 13, not only the projecting part 12 is surely formed, but also the hydraulic solidifying material fluid is filled also into the concave streaks 13 formed during digging, As the number of ridges after curing increases, the vertical bearing capacity of the displacement column also increases accordingly. Therefore, when the predetermined depth is reached, the drilling rod 1 is pulled up to the ground while discharging the hydraulic solidified material liquid from the discharge port 2 b of the drilling head 2 so that the hydraulic solidified material liquid is filled in the borehole, Since the inside is also filled with the hydraulic solidifying agent liquid, when the hydraulic solidifying agent liquid solidifies, the hydraulic solidifying agent liquid displacement column 11 in which the ridges 12 extending in the longitudinal direction are integrally formed on the outer peripheral surface is built Ru. As a result, since the hydraulic solidifying material liquid displacement column 11 has the ridges 12 extending in the longitudinal direction on the outer periphery, the circumferential surface frictional force in the surrounding ground increases, and the vertical supporting force of the hydraulic solidifying material liquid displacement column 11 is increased. can do.

また、円筒体４の掘削ロッド１への取付部分は、掘削ロッド１と掘削ヘッド２との間の継手部とすることにより着脱可能としたり、円筒体４を少なくとも２分割可能な構成とし掘削ロッド１に対し着脱可能とすることで、前記突出体５のサイズや形状が異なる円筒体４を掘削ロッド１に対し付け替え自在となり、これによりそのサイズや形状に応じた、必要とする所定の鉛直支持力が得られる突条部１２を水硬性固化材液置換コラム１１の外周に設けることができる。
また、第８乃至第１１実施の形態では、前記円筒体４はフランジ４ａを介して組み立て可能にしたことで、円筒体４を分割したものをこれらのフランジ４ａ部分で当接し、この当接部で各フランジ４ａどうしを締結具７を用いて締結することで、円筒体４の掘削ロッド１に対する付け替え作業を効率的に実施できる。突出体５が摩耗した時にも有効である。 Further, the attachment portion of the cylindrical body 4 to the drilling rod 1 is detachable by setting it as a joint between the drilling rod 1 and the drilling head 2 or the cylindrical rod 4 can be divided into at least two parts. By making it removable with respect to 1, it becomes possible to replace the cylindrical body 4 having a different size and shape of the protrusion 5 with respect to the digging rod 1, and thereby the required predetermined vertical support according to the size and shape The ridge 12 from which the force can be obtained can be provided on the outer periphery of the hydraulic solidifying material liquid displacement column 11.
Further, in the eighth to eleventh embodiments, the cylindrical body 4 can be assembled via the flange 4a, and the divided parts of the cylindrical body 4 are abutted by these flange 4a portions, and this abutting portion By fastening the flanges 4a with each other using the fasteners 7, the work of replacing the cylindrical body 4 with the drilling rod 1 can be efficiently performed. It is also effective when the protrusion 5 wears.

さらに、掘削ロッド１に円筒体１の軸上下方向移動を規制するずれ止め１ｅ、２ｅ、６ａ、６ｂ、９を設けたことで、円筒体４の軸上下方向移動を規制して、掘削ロッド１の掘進を続けながら円筒体４および突出体５を地盤中に確実に進入させることができ、結果的に円筒体４の突出体５の形状、サイズに応じた突条部１２を水硬性固化材液置換コラム１１外周に確実に形成できる。   Furthermore, by providing shift stops 1e, 2e, 6a, 6b, 9 for restricting the axial vertical movement of the cylindrical body 1 to the drilling rod 1, the axial vertical movement of the cylindrical body 4 is restricted, and the drilling rod 1 is restricted. The cylinder 4 and the protrusion 5 can be reliably made to enter the ground while continuing the drilling, and as a result, the ridge 12 corresponding to the shape and size of the protrusion 5 of the cylinder 4 can be made of a hydraulic solidifying material It can be reliably formed on the outer periphery of the liquid displacement column 11.

本発明の水硬性固化材液置換コラム築造装置は突出体を持つ円筒体を掘削ロッド外周に回転自在に設けることで、これによって築造された水硬性固化材液置換コラムの外周に縦方向に延びる突条部を形成して、周辺地盤に対する水硬性固化材液置換コラムの鉛直支持力を増大させることができるという効果を有し、戸建住宅等の小規模建築物や土間スラブ等の比較的軽微な構造物の基礎工法に使用される水硬性固化材液置換コラム築造装置等に有用である。   The hydraulic solidifying material liquid displacement column construction device of the present invention extends in the longitudinal direction around the hydraulic solidifying material liquid displacement column built by thus providing a cylindrical body having a protrusion rotatably around the digging rod outer circumference. It has the effect of being able to form a ridge and increase the vertical bearing capacity of the hydraulic solidifying material liquid displacement column with respect to the surrounding ground, and it is relatively relatively suitable for small-scale buildings such as detached houses etc. It is useful for hydraulic solidifying material liquid displacement column construction equipment etc. used for foundation construction method of a slight structure.

１Ａ、１Ｂ、１Ｃ、１Ｄ、１Ｅ、１Ｆ、１Ｇ、１Ｈ、１Ｉ、１Ｊ、１Ｋ、１Ｌ 水硬性固化材液置換コラム築造装置
１ａ 掘削ロッドの突き出し部
１ｃ ロッド継手部
１ｄ 流路
１ｅ 段部
２ 掘削ヘッド
２ａ 掘削翼
２ｂ 吐出口
２ｃ 突条
２ｄ ヘッド継手部
２ｅ 段部
３ａ シェアブロック
３ｂ ボルト
４ 円筒体
４ａ フランジ
４ｂ 半円筒板
５ 突出体
５ｂ 突片
５ｃ 尖端
６ａ、６ｂ ずれ止め用突縁（ずれ止め）
７ 締結具
８ 肉厚部
９ リング切欠（ずれ止め）
１０ 突起（突出体）
１１ 水硬性固化材液置換コラム
１２ 突条部
１３ 凹条
Ｐ カット部 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J, 1K, 1L Hydraulic solidifying material liquid displacement column construction device 1a Excavated part of drilling rod 1c Rod joint part 1d Channel 1e Stepped part 2 Drilling Head 2a Drilling wing 2b Outlet 2c Projection 2d Head joint 2e Step 3a Shared block 3b Bolt 4 Cylindrical body 4a Flange 4b Semi-cylindrical plate 5 Protrusive body 5b Protrusive piece 5c Pointed end 6a, 6b )
7 Fasteners 8 Thick portion 9 Ring notch (slip prevention)
10 projections (projectors)
11 hydraulic solidifying material liquid displacement column 12 ridge 13 ridge P cut

Claims (14)

水硬性固化材液の流路を有する掘削ロッド下端部に、その流路に通じる吐出口を有する掘削ヘッドを接続した水硬性固化材液置換コラム築造装置であって、
前記掘削ロッド下方部に、周側面に回転径が該掘削ロッド径よりも大きな突出体を有する円筒体を、該掘削ロッドに回転可能に遊嵌させたことを特徴とする水硬性固化材液置換コラム築造装置。 A hydraulic solidifying material liquid displacement column construction apparatus in which a drilling head having a discharge port communicating with the flow path is connected to a lower end portion of a digging rod having a flow path of hydraulic solidifying material liquid,
A hydraulic solidifying material liquid replacement characterized in that a cylindrical body having a protrusion whose diameter of rotation on the circumferential side is larger than the diameter of the drilling rod is freely loosely fitted on the drilling rod in the lower portion of the drilling rod. Column construction equipment. 前記円筒体の突出体は、板状の突片で形成されていることを特徴とする請求項１記載の水硬性固化材液置換コラム築造装置。   The hydraulic solidifying material liquid displacement column construction apparatus according to claim 1, wherein the protrusion of the cylindrical body is formed of a plate-like projecting piece. 前記円筒体は少なくとも２分割可能であり、前記掘削ロッドに対して着脱可能に形成されていることを特徴とする請求項１または２記載の水硬性固化材液置換コラム築造装置。   The hydraulic solidifying material liquid displacement column construction device according to claim 1 or 2, wherein the cylindrical body is divisible at least into two, and is formed detachably with respect to the digging rod. 前記円筒体は、少なくとも２分割された分割片で形成され、該分割片は端部にフランジを備え、該フランジ同士を連結して組み立て可能であることを特徴とする請求項１乃至３のいずれか１項記載の水硬性固化材液置換コラム築造装置。   The cylinder according to any one of claims 1 to 3, wherein the cylindrical body is formed of at least two divided pieces, and the divided pieces have flanges at their ends and can be assembled by connecting the flanges to each other. A hydraulic solidifying material liquid displacement column construction apparatus according to any one of the preceding items. 前記分割片のフランジ同士を連結して円筒体に組み立てた該フランジを円筒体の突出体とすることを特徴とする請求項４記載の水硬性固化材液置換コラム築造装置。   A hydraulic solidifying material liquid displacement column construction apparatus according to claim 4, wherein the flanges of the divided pieces are connected to each other and the flanges assembled into a cylindrical body are used as a projecting body of the cylindrical body. 前記掘削ロッドには前記円筒体の軸方向移動を規制するずれ止めが設けられていることを特徴とする請求項１乃至５のいずれか１項記載の水硬性固化材液置換コラム築造装置。   A hydraulic solidifying material liquid displacement column construction apparatus according to any one of claims 1 to 5, wherein the digging rod is provided with a slip stopper which regulates axial movement of the cylindrical body. 前記掘削ロッドは、突出体を有する円筒体を回転可能に遊嵌させた位置より下方部分のロッド径が径小となっていることを特徴とする請求項１乃至６のいずれか１項記載の水硬性固化材液置換コラム築造装置。   7. The drilling rod according to any one of claims 1 to 6, wherein the diameter of the rod in the lower portion is smaller than the position where the cylindrical body having the protrusion is rotatably loosely fitted. Hydraulic solidifying material liquid displacement column construction device. 水硬性固化材液の流路を有する掘削ロッド下端部に、その流路に通じる吐出口を有する掘削ヘッドを接続した水硬性固化材液置換コラム築造装置で、前記掘削ロッド下方部に、周側面に回転径が該掘削ロッド径よりも大きな突出体を有する円筒体を、該掘削ロッドに回転可能に遊嵌させた水硬性固化材液置換コラム築造装置を用い、
該築造装置の掘削ロッドを回転させて地盤の所定深度まで掘進した後、掘削ヘッドの吐出口から水硬性固化材液を吐出しつつ、掘削ロッドを回転させて又は無回転で引き上げ、掘削孔内を該水硬性固化材液で填充することを特徴とする水硬性固化材液置換コラム築造方法。 A hydraulic solidifying material liquid displacement column construction apparatus in which a drilling head having a discharge port communicating with the flow path is connected to a lower end portion of a drilling rod having a flow path of hydraulic hardening solid material fluid. Using a hydraulic solidifying material liquid displacement column construction apparatus in which a cylindrical body having a protrusion whose rotation diameter is larger than that of the drilling rod is rotatably loosely fitted to the drilling rod,
After the drilling rod of the construction device is rotated and excavated to a predetermined depth in the ground, the hydraulic rod is discharged from the outlet of the drilling head while the drilling rod is rotated or pulled up without rotation, and within the drilling hole A method for constructing a hydraulic-solidified material liquid displacement column, comprising: filling with the hydraulically-solidified liquid material. 前記円筒体の突出体は、板状の突片で形成されていることを特徴とする請求項８記載の水硬性固化材液置換コラム築造方法。   The method according to claim 8, wherein the projection of the cylindrical body is formed of a plate-like projecting piece. 前記円筒体は少なくとも２分割可能であり、前記掘削ロッドに対して着脱可能に形成されていることを特徴とする請求項８または９記載の水硬性固化材液置換コラム築造方法。   The method according to claim 8 or 9, wherein the cylindrical body is divisible at least into two, and is formed detachably with respect to the digging rod. 前記円筒体は、少なくとも２分割された分割片で形成され、該分割片は端部にフランジを備え、該フランジ同士を連結して組み立て可能であることを特徴とする請求項８乃至１０のいずれか１項記載の水硬性固化材液置換コラム築造方法。   The cylinder according to any one of claims 8 to 10, wherein the cylindrical body is formed of at least two divided pieces, and the divided pieces have flanges at their ends and can be assembled by connecting the flanges to each other. The method for constructing a hydraulic solidifying material liquid displacement column according to Item 1 or 2. 前記分割片のフランジ同士を連結して円筒体に組み立てた該フランジを円筒体の突出体とすることを特徴とする請求項１１記載の水硬性固化材液置換コラム築造方法。   The method according to claim 11, wherein the flanges of the divided pieces are connected to each other and the flanges assembled into a cylindrical body are used as a projecting body of a cylindrical body. 前記掘削ロッドには前記円筒体の軸方向移動を規制するずれ止めが設けられていることを特徴とする請求項８乃至１２のいずれか１項記載の水硬性固化材液置換コラム築造方法。   13. The method according to any one of claims 8 to 12, wherein the digging rod is provided with a slip stopper for restricting the axial movement of the cylindrical body. 前記掘削ロッドは、突出体を有する円筒体を回転可能に遊嵌させた位置より下方部分のロッド径が径小となっていることを特徴とする請求項８乃至１３のいずれか１項記載の水硬性固化材液置換コラム築造方法。   14. The drilling rod according to any one of claims 8 to 13, wherein the diameter of the rod in the lower portion is smaller than the position where the cylindrical body having the protrusion is rotatably loosely fitted. Hydraulic solidifying material liquid displacement column construction method.
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