JP2019206868A - Micro pile construction method and insertion member for filling grout material used in micro pile construction method - Google Patents

Micro pile construction method and insertion member for filling grout material used in micro pile construction method Download PDF

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JP2019206868A
JP2019206868A JP2018103189A JP2018103189A JP2019206868A JP 2019206868 A JP2019206868 A JP 2019206868A JP 2018103189 A JP2018103189 A JP 2018103189A JP 2018103189 A JP2018103189 A JP 2018103189A JP 2019206868 A JP2019206868 A JP 2019206868A
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grout material
bag body
casing
filling
reinforcing bar
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JP7032242B2 (en
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笹谷　輝勝
Terumasa Sasatani
輝勝 笹谷
藤岡　晃
Akira Fujioka
晃 藤岡
涼 藤井
Ryo Fujii
涼 藤井
芳寿 稲冨
Yoshitoshi Inatomi
芳寿 稲冨
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Fujita Corp
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Fujita Corp
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Abstract

To provide a micro pile construction method that can obtain micro piles supported by a load bearing ground firmly even when the load bearing ground has gaps and cracks.SOLUTION: A section of a bag body 36 around one opening thereof is attached to a reinforcement 32 and a grout material supply pipe 34 via a band. A section of the bag body 36 around the other opening thereof is attached to the reinforcement 32 via a band. An insertion member 30 for filling a grout material is composed of the bag body 36 being wound on the reinforcement 32 and the grout material supply pipe 34. The method of the present invention includes: inserting the insertion member 30 for filling the grout material into a casing C before a step of raising the casing C after a step of pulling out an excavation drill 14; and bringing an outer peripheral surface of the bag body 36 into pressure contact with an inner peripheral surface of a hole 18 by filling the inside of the bag body 36 with a grout material G after the step of raising the casing C, and bringing the outer peripheral surface of the bag body 36 into pressure contact with an inner peripheral surface of the casing C.SELECTED DRAWING: Figure 1

Description

本発明は、マイクロパイル工法およびマイクロパイル工法で用いるグラウト材充填用挿入部材に関する。   The present invention relates to a micropile construction method and an insertion member for filling a grout material used in the micropile construction method.

マイクロパイル工法は、直径３００ｍｍ以下の小径の場所打ち杭の総称であり、コンパクトな施工設備で足りること、狭い空間で施工できること、既設構造物の機能を停止することなく施工できることなどの理由から、既設構造物の耐震補強や地盤補強、斜面の安定化などをはじめとする様々な用途に用いられている。
図６（Ａ）に示すように、マイクロパイル工法を施工するにあたり、先端外周部が外側削孔用カッター１２とされた１番目の細長い中空円筒形の鋼製のケーシングセグメント１０の内部に、先端に削孔ドリル１４が取着された１番目のロッド１６を挿通させ、それらケーシングセグメント１０とロッド１６とを回転させつつ、また、水を注入しつつ外側削孔用カッター１２と削孔ドリル１４とで孔１８を削孔していく工程が行なわれる。
そして、図６（Ｂ）、（Ｃ）に示すように、孔１８が所定の深さとなる毎に、ケーシングセグメント１０の端部に次の鋼製のケーシングセグメント１０を、継手部材を介して着脱可能に連結して継ぎ足すと共に、ロッド１６の端部に次のロッド１６を着脱可能に連結して継ぎ足し、ケーシングセグメント１０とロッド１６とを回転させ、また、水を注入しつつ外側削孔用カッター１２と削孔ドリル１４とで孔１８を削孔していく工程が行なわれる。 The micropile construction method is a generic name for small-sized cast-in-place piles with a diameter of 300 mm or less, because it is sufficient for compact construction equipment, can be constructed in a narrow space, and can be constructed without stopping the function of the existing structure, etc. It is used for various purposes including seismic reinforcement of existing structures, ground reinforcement, and stabilization of slopes.
As shown in FIG. 6 (A), when constructing the micropile method, the tip end outer peripheral portion is formed in the first elongated hollow cylindrical steel casing segment 10 whose outer peripheral portion is the outer drilling cutter 12. The first rod 16 to which the drilling hole 14 is attached is inserted through the outer hole drilling cutter 12 and the drilling drill 14 while the casing segment 10 and the rod 16 are rotated and water is injected. The process of drilling the hole 18 is performed.
Then, as shown in FIGS. 6B and 6C, each time the hole 18 reaches a predetermined depth, the next steel casing segment 10 is attached to and detached from the end of the casing segment 10 via a joint member. The next rod 16 is detachably connected to the end of the rod 16 and added, the casing segment 10 and the rod 16 are rotated, and water is injected for outer drilling. A step of drilling the hole 18 with the cutter 12 and the hole drill 14 is performed.

複数のケーシングセグメント１０が連結されることでケーシングＣが構成される。
図６（Ｃ）に示すように、削孔された孔１８が上層地盤２０を通過し荷重支持地盤２２の所定の深さに到達したならば、ロッド１６と共に削孔ドリル１４をケーシングＣの内部から引き抜く工程が行なわれる。
次に、図６（Ｄ）に示すように、鉄筋などの補強材２４をケーシングＣの内部にケーシングＣの全長にわたって配設する。
次に、不図示のグラウト材供給管を用いてケーシングＣの内部にグラウト材Ｇを充填する。
グラウト材Ｇとして、セメントミルク、モルタル材、小径の骨材を混入したコンクリート材が使用可能である。
次に、図６（Ｅ）に示すように、ケーシングＣの内部にグラウト材Ｇを加圧注入しつつ、ケーシングＣを引き抜く工程、すなわち、ケーシングセグメント１０の引き抜き工程が行なわれる。
グラウト材Ｇの加圧は、グラウト材Ｇが、削孔された孔１８の壁面に密着し、グラウト材Ｇと地盤との間の接合状態が強固となるような圧力で行なわれる。
ケーシングＣの引き抜きは、上下に隣り合うケーシングセグメント１０のうち、下方に位置するケーシングセグメント１０の上端が地盤上に位置したところで、下方のケーシングセグメント１０を回転不能に把持し、上方のケーシングセグメント１０を回転操作し、下方のケーシングセグメント１０に対して上方のケーシングセグメント１０を継手部材と共に取り外すことで行なう。 Casing C is constituted by connecting a plurality of casing segments 10.
As shown in FIG. 6 (C), when the drilled hole 18 passes through the upper ground 20 and reaches a predetermined depth of the load supporting ground 22, the drill 16 together with the rod 16 is inserted into the casing C. The process of extracting from is performed.
Next, as shown in FIG. 6D, a reinforcing member 24 such as a reinforcing bar is disposed in the casing C over the entire length of the casing C.
Next, the grout material G is filled inside the casing C using a grout material supply pipe (not shown).
As the grout material G, cement milk, mortar material, or a concrete material mixed with a small diameter aggregate can be used.
Next, as shown in FIG. 6E, a step of pulling out the casing C, that is, a step of pulling out the casing segment 10 is performed while the grout material G is injected under pressure into the casing C.
The grout material G is pressed at such a pressure that the grout material G comes into close contact with the wall surface of the drilled hole 18 and the joining state between the grout material G and the ground becomes strong.
When the upper end of the lower casing segment 10 is positioned on the ground, the lower casing segment 10 is non-rotatably gripped and the upper casing segment 10 is pulled out. And the upper casing segment 10 is removed from the lower casing segment 10 together with the joint member.

上方に位置する複数本のケーシングセグメント１０が継手部材と共に取り外され、図６（Ｅ）に示すように、最下位に位置する一番目のケーシングセグメント１０の下端が、荷重支持地盤２２の最上部に近づいたところで、ケーシングＣの引き抜きは終了する。
次に、図６（Ｆ）に示すように、ケーシングＣを、加圧充填されたグラウト材Ｇの中に所定量押し戻す工程が行なわれ、ケーシングＣで囲繞された部分と、ケーシングＣで囲繞されていない部分との間に、中間的な構造を有する部分を作り出す。
そして、グラウト材Ｇが硬化されることで、グラウト材Ｇによる地盤接合部２６Ａを有する杭体２６が得られる。
次に、図６（Ｇ）に示すように、ケーシングＣの上端部に鋼製の支圧板２８が溶接により接合されており、杭体２６の杭頭部を構造物に連結するための連結構造が形成される。 A plurality of casing segments 10 positioned above are removed together with the joint member, and the lower end of the first casing segment 10 positioned at the lowest position is located at the uppermost portion of the load supporting ground 22 as shown in FIG. When approaching, the extraction of the casing C is completed.
Next, as shown in FIG. 6 (F), a step of pushing back the casing C by a predetermined amount into the pressure-filled grout material G is performed, and the portion surrounded by the casing C and the casing C are surrounded. A part having an intermediate structure is created between the parts that are not.
And the pile 26 which has 26 A of ground junction parts by the grout material G is obtained because the grout material G is hardened | cured.
Next, as shown in FIG. 6 (G), a steel bearing plate 28 is joined to the upper end of the casing C by welding, and a connection structure for connecting the pile head of the pile body 26 to the structure. Is formed.

特許第４０１０３８３号Patent No. 4010383

ところで、事前の地質調査で荷重支持地盤２２に隙間やひび割れなどがあると判明した場合には、荷重支持地盤２２に隙間やひび割れがない場所に変えて削孔工程が行なわれるが、事前の地質調査で荷重支持地盤２２の隙間やひび割れがないと判明された場合であっても、荷重支持地盤２２に隙間やひび割れがある場合もある。
このような場合、図６（Ｅ）に示すように、ケーシングＣの内部にグラウト材Ｇを充填する工程や、ケーシングＣの内部にグラウト材Ｇを加圧注入しつつ、ケーシングＣを引き抜く工程において、グラウト材Ｇが充填されず、あるいは、グラウド材Ｇを加圧できず、荷重支持地盤２２で強固に支持されたマイクロパイルを得ることができない。
そこで、このような場合、従来では、場所を変え再度削孔工程からやり直すようにしており、何らかの改善が求められていた。
本発明は前記事情に鑑み案出されたものであって、本発明の目的は、荷重支持地盤に隙間やひび割れがある場合であっても、荷重支持地盤で強固に支持されたマイクロパイルを得ることができるマイクロパイル工法およびマイクロパイル工法で用いるグラウト材充填用挿入部材を提供することにある。 By the way, when it is determined in the preliminary geological survey that the load supporting ground 22 has gaps or cracks, the drilling process is performed by changing the load supporting ground 22 to a place where there are no gaps or cracks. Even when the investigation reveals that there are no gaps or cracks in the load supporting ground 22, there may be gaps or cracks in the load supporting ground 22.
In such a case, as shown in FIG. 6E, in the step of filling the grout material G inside the casing C, or the step of pulling out the casing C while injecting the grout material G into the casing C under pressure. The grout material G is not filled, or the grout material G cannot be pressurized, and the micropile firmly supported by the load supporting ground 22 cannot be obtained.
Therefore, in such a case, conventionally, the location is changed and the drilling process is started again, and some improvement has been demanded.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to obtain a micropile that is firmly supported by the load supporting ground even when the load supporting ground has gaps or cracks. Another object of the present invention is to provide a micropile construction method and an insertion member for filling a grout material used in the micropile construction method.

前記目的を達成するため、本発明は、ケーシングセグメントとその内部に配置された削孔ドリルとを回転させつつ、また、前記ケーシングセグメントと前記削孔ドリルのロッドとを継ぎ足しつつ削孔する工程と、前記削孔された孔が上層地盤の下の荷重支持地盤の所定の深さに到達した時点で、前記継ぎ足された複数のケーシングセグメントにより形成されたケーシングの内部から前記削孔ドリルを引き抜く工程と、前記荷重支持地盤内で前記ケーシングを所定量引き上げる工程とを備えるマイクロパイル工法において、長手方向の両端が開口部とされた細長の袋体を設け、鉄筋と、長手方向の一端にグラウト材供給口を有し他端にグラウト材吐出口を有し前記鉄筋に取着されたグラウト材供給管とを設け、長手方向の両端を前記両端の開口部から突出させて前記鉄筋を前記袋体に挿通すると共に、前記グラウト材供給口を前記一方の開口部から突出させて前記グラウト材供給管を前記袋体に挿入し前記グラウト材吐出口を前記袋体の内部に位置させ、前記一方の開口部の周囲の前記袋体の箇所を前記鉄筋と前記グラウト材供給管とに取着すると共に前記両端の開口部のうちの他方の開口部の周囲の前記袋体の箇所を前記鉄筋に取着し、前記袋体を前記鉄筋と前記グラウト材供給管に巻き付けたグラウト材充填用挿入部材を設け、前記引き抜く工程の後で前記引き上げる工程の前に、前記グラウト材充填用挿入部材を前記ケーシングの内部に挿入し、前記引き上げる工程の後に、前記グラウト材吐出口から前記袋体の内部にグラウト材を充填して前記孔の内周面に前記袋体の外周面を圧接されると共に、前記荷重支持地盤から前記上層地盤に位置する前記ケーシング部分の内周面に前記袋体の外周面を圧接させ、さらに、前記袋体の上方に位置するケーシングの内部にグラウト材を充填するようにしたことを特徴とする。
また、本発明は、マイクロパイル工法において、継ぎ足された複数のケーシングセグメントとその内部に配置された削孔ドリルにより削孔される孔が、上層地盤の下の荷重支持地盤の所定の深さに到達した時点で、前記継ぎ足された複数のケーシングセグメントにより形成されたケーシングの内部に挿入されるグラウト材充填用挿入部材であって、前記グラウト材充填用挿入部材は、長手方向の両端が開口部とされた細長の袋体と、その長手方向の両端が前記両端の開口部から突出させて前記袋体に挿通された鉄筋と、前記鉄筋に取着され長手方向の一端のグラウト材供給口を前記両端の開口部のうちの一方の開口部から突出させて前記袋体に挿入され長手方向の他端のグラウト材吐出口が前記袋体の内部に位置するグラウト材供給管とを備え、前記グラウト材充填用挿入部材は、前記一方の開口部の周囲の前記袋体の箇所が前記鉄筋と前記グラウト材供給管とに取着されると共に前記両端の開口部のうちの他方の開口部の周囲の前記袋体の箇所が前記鉄筋に取着され、前記袋体が前記鉄筋と前記グラウト材供給管に巻き付けられて構成され、前記袋体は、前記グラウト材供給管から前記グラウト材吐出口を介して前記袋体の内部にグラウト材が充填されると、前記孔の内周面よりも大きい寸法の外径で膨出可能であることを特徴とする。 In order to achieve the above object, the present invention comprises a step of drilling while rotating a casing segment and a drill drill disposed therein, and adding the casing segment and a rod of the drill drill. And, when the drilled hole reaches a predetermined depth of the load supporting ground below the upper layer ground, the step of pulling out the drill drill from the inside of the casing formed by the plurality of casing segments added And a step of pulling up the casing within the load supporting ground by a predetermined amount, and providing a slender bag body having both ends in the longitudinal direction as openings, a reinforcing bar, and a grout material at one end in the longitudinal direction. A grout material supply pipe having a supply port and a grout material discharge port at the other end and attached to the reinforcing bar is provided, and both ends in the longitudinal direction are open at the both ends. The grout material supply port is protruded from the one opening, the grout material supply pipe is inserted into the bag body, and the grout material discharge port is inserted into the bag. Positioned inside the body, attaches the portion of the bag around the one opening to the reinforcing bar and the grout material supply pipe, and around the other opening of the openings at both ends. A portion of the bag body is attached to the reinforcing bar, and an insertion member for filling the grout material around the reinforcing bar and the grout material supply pipe is provided, and before the step of pulling up after the step of pulling out, After the step of inserting the grout material filling insertion member into the casing and pulling it up, the grout material is filled into the bag body from the grout material discharge port, and the bag body is formed on the inner peripheral surface of the hole. Outer peripheral surface The outer peripheral surface of the bag body is pressed against the inner peripheral surface of the casing portion located on the upper layer ground from the load supporting ground, and the grout material is disposed inside the casing located above the bag body. It is characterized by being filled with.
Further, in the present invention, in the micropile method, a plurality of casing segments that are joined together and a hole drilled by a drilling drill disposed therein has a predetermined depth of the load supporting ground below the upper layer ground. A grouting material filling insertion member inserted into a casing formed by the plurality of casing segments that are joined when the grouting material is reached, the grouting material filling insertion member being open at both ends in the longitudinal direction; An elongated bag body, a reinforcing bar inserted into the bag body with both ends in the longitudinal direction protruding from the openings at both ends, and a grout material supply port at one end in the longitudinal direction attached to the reinforcing bar. A grout material supply pipe that protrudes from one of the openings at both ends and is inserted into the bag body and has a grout material discharge port at the other end in the longitudinal direction located inside the bag body. The insertion member for filling the grout material is such that the portion of the bag around the one opening is attached to the reinforcing bar and the grout material supply pipe, and the other opening of the openings at both ends is attached. A portion of the bag body around a part is attached to the reinforcing bar, and the bag body is wound around the reinforcing bar and the grout material supply pipe, and the bag body is formed from the grout material supply pipe to the grout material. When the grout material is filled into the bag body through the discharge port, the bag body can swell with an outer diameter larger than the inner peripheral surface of the hole.

本発明のマイクロパイル工法およびマイクロパイル工法で用いるグラウト材充填用挿入部材によれば、荷重支持地盤に隙間やひび割れなどがある場合であっても、荷重支持地盤の孔の内周面に袋体を介してグラウト材を圧接でき、したがって、荷重支持地盤に強固に固定されたマイクロパイルを構築することが可能となる。   According to the micropile method of the present invention and the insertion member for filling a grout material used in the micropile method, the bag body is formed on the inner peripheral surface of the hole of the load support ground even when there is a gap or crack in the load support ground. Therefore, it is possible to construct a micropile firmly fixed to the load supporting ground.

（Ａ）〜（Ｇ）はグラウト材充填用挿入部材を用いたマイクロパイル工法の説明図である。(A)-(G) are explanatory drawings of the micropile construction method using the insertion member for grout material filling. グラウト材充填用挿入部材の正面図である。It is a front view of the insertion member for grout material filling. 鉄筋、グラウト材供給管、袋体との関係を示すグラウト材充填用挿入部材の正面図である。It is a front view of the insertion member for grout material filling which shows the relationship between a reinforcing bar, a grout material supply pipe, and a bag. 袋体の内部にグラウト材が充填された状態のグラウト材充填用挿入部材の正面図である。It is a front view of the insertion member for grout material filling in the state where the grout material was filled inside the bag body. 図１（Ｆ）のＨＨ線断面図である。It is the HH sectional view taken on the line of FIG. 従来のマイクロパイル工法の説明図である。It is explanatory drawing of the conventional micropile construction method.

以下に図面を参照して、本発明の実施の形態について説明する。
まず、グラウト材充填用挿入部材３０について説明する。
図２に示すように、グラウト材充填用挿入部材３０は、鉄筋３２と、グラウト材供給管３４と、袋体３６とを含んで構成されている。
図１（Ｄ）〜（Ｇ）に示すように、鉄筋３２は、ケーシングＣの上端から一定の深さに到達した孔１８の底部１８０２に届く長さを有している。
グラウト材供給管３４は、本実施の形態では１本の耐圧ホースを使用している。なお、グラウト材供給管３４として、鋼製や合成樹脂製の複数の管体が継手部材を介して液密に連結されて構成されていてもよいが、耐圧ホースを用いるとグラウト材供給管３４を簡単に構成でき、コストダウンを図る上で有利となる。
グラウト材供給管３４は、ケーシングＣの上端から、上層地盤２０を通過し荷重支持地盤２２の所定の深さに到達した削孔された孔１８の底部１８０２の近傍に位置する長さを有している。
グラウト材供給管３４は、その上端開口がグラウト材供給口３４０２とされ、グラウト材供給管３４の下端開口がグラウト材吐出口３４０４とされている。
鉄筋３２とグラウト材供給管３４は、それらの長手方向の複数箇所がバンド４２などで取着されている。 Embodiments of the present invention will be described below with reference to the drawings.
First, the grout material filling insertion member 30 will be described.
As shown in FIG. 2, the grout material filling insertion member 30 includes a reinforcing bar 32, a grout material supply pipe 34, and a bag body 36.
As shown in FIGS. 1D to 1G, the reinforcing bar 32 has a length that reaches the bottom 1802 of the hole 18 that reaches a certain depth from the upper end of the casing C.
The grout material supply pipe 34 uses a single pressure hose in the present embodiment. In addition, as the grout material supply pipe 34, a plurality of pipes made of steel or synthetic resin may be configured to be liquid-tightly connected through a joint member. However, if a pressure hose is used, the grout material supply pipe 34 is used. Can be configured easily, which is advantageous for cost reduction.
The grout material supply pipe 34 has a length located in the vicinity of the bottom 1802 of the drilled hole 18 that has passed through the upper layer ground 20 and reached the predetermined depth of the load supporting ground 22 from the upper end of the casing C. ing.
The grout material supply pipe 34 has an upper end opening as a grout material supply port 3402 and a lower end opening of the grout material supply pipe 34 as a grout material discharge port 3404.
The reinforcing bar 32 and the grout material supply pipe 34 are attached to a plurality of portions in the longitudinal direction by bands 42 or the like.

図３、図４に示すように、袋体３６は中空の円筒状を呈し、外形よりも長さが大きい細長状を呈し、その長手方向の両端が開口部とされている。
鉄筋３２は、その長手方向の両端が袋体３６の両端の開口部から突出させて袋体３６に挿通されている。
グラウト材供給管３４は、グラウト材供給口３４０２を袋体３６の両端の開口部のうちの一方の開口部から突出させ、グラウト材吐出口３４０４が袋体３６の内部で長手方向の端部である他方の開口部寄りに位置している。
グラウト材充填用挿入部材３０は、一方の開口部の周囲の袋体３６の箇所が、バンド３８や不図示のシール材などを介して鉄筋３２とグラウト材供給管３４に強固に液密に固定され、両端の開口部のうちの他方の開口部の周囲の袋体３６の箇所がバンド３９や不図示のシール材などを介して鉄筋３２に強固に液密に固定されている。
そして、袋体３６が鉄筋３２とグラウト材供給管３４に巻き付けられてグラウト材充填用挿入部材３０が構成されている。 As shown in FIGS. 3 and 4, the bag body 36 has a hollow cylindrical shape, has an elongated shape whose length is larger than the outer shape, and both ends in the longitudinal direction are openings.
The reinforcing bars 32 are inserted through the bag body 36 such that both ends in the longitudinal direction protrude from openings at both ends of the bag body 36.
The grout material supply pipe 34 projects the grout material supply port 3402 from one of the openings at both ends of the bag body 36, and the grout material discharge port 3404 is at the end in the longitudinal direction inside the bag body 36. It is located near the other opening.
In the insertion member 30 for filling the grout material, the position of the bag body 36 around one opening is firmly and liquid-tightly fixed to the reinforcing bar 32 and the grout material supply pipe 34 via a band 38 or a seal material (not shown). The portion of the bag body 36 around the other of the openings at both ends is firmly and liquid-tightly fixed to the reinforcing bar 32 via a band 39, a sealing material (not shown) or the like.
And the bag body 36 is wound around the reinforcing bar 32 and the grout material supply pipe 34 to constitute the grout material filling insertion member 30.

袋体３６が鉄筋３２とグラウト材供給管３４に巻装された状態で、その外径は、ケーシングＣの内径よりも十分に小さく、グラウト材充填具３０がケーシングＣ内に円滑に挿入できるように図られている。
袋体３６のグラウト材供給管３４への巻装状態は、例えば、袋体３６の膨張時に破断可能な不図示のテープなどの帯材や線材を巻装状態の袋体３６の上に螺旋状に巻回することで保持される。
袋体３６は、半不透水性および可撓性を有する材料で形成され、グラウト材Ｇが充填された際に、図４に示すように、削孔された孔１８の内周面よりも大きい寸法の外径の円筒状に膨出できる寸法で形成され、削孔された孔１８の内周面に圧接できるように形成されている。なお、袋体３６が膨出した状態で鉄筋３２は袋体３６の中心に位置している。
また、袋体３６に用いられる材料には、可撓可能なメッシュ材を含んで構成され、ケーシングセグメント１０の外側削孔用カッター１２や孔１８の内周面に突出される複数の突起に対して、破断されないように図られている。 In a state where the bag body 36 is wound around the reinforcing bar 32 and the grout material supply pipe 34, the outer diameter is sufficiently smaller than the inner diameter of the casing C so that the grout material filling tool 30 can be smoothly inserted into the casing C. It is envisaged.
The wound state of the bag body 36 around the grout material supply pipe 34 is, for example, a spiral material such as a tape (not shown) that can be broken when the bag body 36 is inflated or a wire material spirally on the wound bag body 36. It is held by winding it around.
The bag body 36 is formed of a semi-impermeable and flexible material and, when filled with the grout material G, is larger than the inner peripheral surface of the drilled hole 18 as shown in FIG. It is formed so as to be able to swell into a cylindrical shape having an outer diameter of the size, and is formed so as to be able to be pressed against the inner peripheral surface of the hole 18 that has been drilled. The reinforcing bar 32 is located at the center of the bag body 36 in a state where the bag body 36 is bulged.
Further, the material used for the bag body 36 includes a flexible mesh material, and a plurality of protrusions protruding from the outer peripheral cutter 12 of the casing segment 10 and the inner peripheral surface of the hole 18. Thus, it is designed not to be broken.

本実施の形態では、鉄筋３２の下端に、鉄筋３２よりも大径の沈下防止板４４が取着され、鉄筋３２の下端が孔１８の底部１８０２に安定した状態で起立できるように図られている。
袋体３６は、沈下防止板４４よりも上方でグラウト材吐出口３４０４よりも下方の鉄筋３２の箇所に巻装されている。
鉄筋３２の下端に取着される沈下防止板４４の外径は、鉄筋３２に巻装された袋体３６の外径よりも大きく、巻装された袋体３６がケーシングＣの内周面に接触することなく、グラウト材充填具３０がケーシングＣ内に円滑に挿入できるように図られている。 In the present embodiment, a sinking prevention plate 44 having a diameter larger than that of the reinforcing bar 32 is attached to the lower end of the reinforcing bar 32 so that the lower end of the reinforcing bar 32 can stand up stably on the bottom 1802 of the hole 18. Yes.
The bag body 36 is wound around the reinforcing bar 32 above the sag prevention plate 44 and below the grout material discharge port 3404.
The outer diameter of the settling prevention plate 44 attached to the lower end of the reinforcing bar 32 is larger than the outer diameter of the bag body 36 wound around the reinforcing bar 32, and the wound bag body 36 is formed on the inner peripheral surface of the casing C. The grout filler 30 can be smoothly inserted into the casing C without contact.

つぎに、グラウト材充填用挿入部材３０を用いたマイクロパイル工法について説明する。
なお、事前の地質調査で、荷重支持地盤２２に隙間やひび割がある場合について説明する。
図１（Ａ）〜（Ｃ）までは従来のマイクロパイル工法と同様である。すなわち、ケーシングセグメント１０の外側削孔用カッター１２と削孔ドリル１４とで孔１８を削孔していく工程が行なわれ、削孔された孔１８が上層地盤２０を通過し荷重支持地盤２２の所定の深さに到達したならば、ロッド１６と共に削孔ドリル１４をケーシングＣの内部から引き抜く工程が行なわれる。 Next, a micropile method using the grout material filling insertion member 30 will be described.
A case where there is a gap or a crack in the load supporting ground 22 in a prior geological survey will be described.
1A to 1C are the same as the conventional micropile construction method. That is, the step of drilling the hole 18 with the outer hole drilling cutter 12 and the drilling drill 14 of the casing segment 10 is performed, and the drilled hole 18 passes through the upper ground 20 and the load supporting ground 22. When the predetermined depth is reached, a step of pulling out the hole drill 14 together with the rod 16 from the inside of the casing C is performed.

ここで、図１（Ｄ）に示すように、グラウト材充填用挿入部材３０をケーシングＣの内部に挿入し、鉄筋３２の下端をなす沈下防止板４４を孔１８の底部１８０２に到達させる。
沈下防止板４４が孔１８の底部１８０２に載置されたならば、図１（Ｅ）に示すように、ケーシングＣを引き上げ、ケーシングＣの下端を、荷重支持地盤２２の上端から所定の距離下方に離れた箇所に位置させる。
この場合、ケーシングＣの下端を、荷重支持地盤２２の上端から所定の距離下方に離れた箇所に位置させるとは、従来の図６（Ｆ）に示すケーシングＣを、加圧充填されたグラウト材Ｇの中に所定量押し戻す工程で押し戻される位置と同じ位置である。
次に、図１（Ｆ）に示すように、グラウト材供給口３４０２からグラウト材供給管３４にグラウト材Ｇを供給し、グラウト材吐出口３４０４からグラウト材Ｇを袋体３６の内部に充填する。
グラウト材Ｇとして、従来と同様にセメントミルク、モルタル材、小径の骨材を混入したコンクリート材が使用可能である。
袋体３６の内部にグラウト材Ｇが充填されていくにつて、袋体３６は膨張していき、図１（Ｆ）および図５に示すように、袋体３６は孔１８の内周面に圧接されると共に、ケーシングＣの下部においてケーシングＣの内周面に圧接される。
グラウト材供給口３４０２からグラウト材供給管３４に供給されるグラウト材Ｇの圧力が所定の値となった時点で、袋体３６の孔１８の内周面への圧接力およびケーシングＣの下部の内周面への圧接力が所定の値となり、ここでグラウト材供給口３４０２へのグラウト材Ｇの供給を停止し、グラウト材供給口３４０２をキャップにより閉塞する。 Here, as shown in FIG. 1D, the grout material filling insertion member 30 is inserted into the casing C, and the subsidence prevention plate 44 that forms the lower end of the reinforcing bar 32 reaches the bottom 1802 of the hole 18.
If the settlement prevention plate 44 is placed on the bottom 1802 of the hole 18, the casing C is pulled up, and the lower end of the casing C is moved a predetermined distance below the upper end of the load supporting ground 22 as shown in FIG. It is located in a place away from.
In this case, if the lower end of the casing C is positioned at a position away from the upper end of the load supporting ground 22 by a predetermined distance, the conventional casing C shown in FIG. It is the same position as the position pushed back in the step of pushing back a predetermined amount in G.
Next, as shown in FIG. 1 (F), the grout material G is supplied from the grout material supply port 3402 to the grout material supply pipe 34, and the grout material G is filled into the bag body 36 from the grout material discharge port 3404. .
As the grout material G, a cement material mixed with cement milk, mortar material, and small diameter aggregate can be used as in the past.
As the grout material G is filled into the bag body 36, the bag body 36 expands, and the bag body 36 is formed on the inner peripheral surface of the hole 18 as shown in FIGS. At the same time, it is pressed against the inner peripheral surface of the casing C at the lower part of the casing C.
When the pressure of the grout material G supplied from the grout material supply port 3402 to the grout material supply pipe 34 reaches a predetermined value, the pressure contact force on the inner peripheral surface of the hole 18 of the bag body 36 and the lower part of the casing C The pressure contact force to the inner peripheral surface becomes a predetermined value, and the supply of the grout material G to the grout material supply port 3402 is stopped here, and the grout material supply port 3402 is closed with a cap.

一方、グラウト材供給口３４０２からグラウト材供給管３４にグラウト材Ｇを供給する作業と並行して、ケーシングＣの内部で袋体３６の上方の空間にグラウト材Ｇを充填する作業を行なう。
そして、袋体３６の内部およびケーシングＣ内部のグラウト材Ｇが硬化されることで、袋体３６による地盤接合部２６Ａを有するマイクロパイル４６（杭体２６）が得られる。
袋体３６の内部およびケーシングＣ内部のグラウト材Ｇが硬化したならば、図１（Ｇ）に示すように、ケーシングＣの上端部に鋼製の支圧板２８が溶接により接合されており、杭体２６の杭頭部を構造物に連結するための連結構造が形成される。 On the other hand, in parallel with the operation of supplying the grout material G from the grout material supply port 3402 to the grout material supply pipe 34, the operation of filling the grout material G in the space above the bag body 36 inside the casing C is performed.
And the grout material G inside the bag body 36 and the inside of the casing C is hardened, whereby a micropile 46 (pile body 26) having the ground joint portion 26A by the bag body 36 is obtained.
If the grout material G in the bag body 36 and the casing C is hardened, a steel bearing plate 28 is joined to the upper end of the casing C by welding as shown in FIG. A connection structure for connecting the pile head of the body 26 to the structure is formed.

本実施の形態によれば、荷重支持地盤２２に隙間やひび割れなどがある場合であっても、荷重支持地盤２２の孔１８の内周面に袋体３６を介してグラウト材Ｇを圧接でき、したがって、荷重支持地盤２２に強固に固定されたマイクロパイル４６を構築することが可能となる。
また、荷重支持地盤２２に圧接されたグラウト材Ｇは、ケーシングＣの下部の内部にも充填され、荷重支持地盤２２に圧接されたグラウト材ＧとケーシングＣの下部に充填されたグラウト材Ｇとが一体化されているので、マイクロパイル４６の強度、剛性を高める上でも有利となる。
また、構築されたマイクロパイル４６の補強材として機能する鉄筋３２を、ケーシングＣの内部から削孔された孔１８の底部１８０２にグラウト材供給管３４と袋体３６とを案内するガイド部材として用いるようにしたので、最少の部品点数でグラウト材充填用挿入部材３０を構成でき、グラウト材充填用挿入部材３０のコンパクト化、コストダウンを図る上で有利となる。
また、鉄筋３２は、孔１８の底部１８０２に到達する長さを有しているので、グラウト材充填用挿入部材３０のケーシングＣの内部への挿入時、袋体３６の下部を孔１８の底部１８０２に確実に案内でき、孔１８の内周面およびケーシングＣの内周面に袋体３６を介してグラウト材Ｇを確実に圧接する上で有利となり、また、マイクロパイル４６の強度、剛性を高める上で有利となる。
また、事前の地質調査で荷重支持地盤２２の隙間やひび割れがないと判明され、グラウト材Ｇを充填する段階で荷重支持地盤２２に隙間やひび割れがあると判明した場合も、場所を変えることなく同じ場所でグラウト材充填用挿入部材３０を用いて上記と同様な工程によりマイクロパイル４６を構築でき、施工効率を高める上で有利となる。 According to the present embodiment, even when the load supporting ground 22 has a gap or a crack, the grout material G can be pressed against the inner peripheral surface of the hole 18 of the load supporting ground 22 via the bag body 36, Therefore, the micropile 46 firmly fixed to the load supporting ground 22 can be constructed.
Further, the grout material G pressed against the load supporting ground 22 is also filled inside the lower portion of the casing C, and the grout material G pressed against the load supporting ground 22 and the grout material G filled below the casing C Are integrated, which is advantageous in increasing the strength and rigidity of the micropile 46.
Further, the reinforcing bar 32 functioning as a reinforcing material for the constructed micropile 46 is used as a guide member for guiding the grout material supply pipe 34 and the bag body 36 to the bottom 1802 of the hole 18 drilled from the inside of the casing C. Since it did in this way, the insertion member 30 for grout material filling can be comprised with the minimum number of parts, and it becomes advantageous when aiming at the compactization of the insertion member 30 for grout material filling, and cost reduction.
Further, since the reinforcing bar 32 has a length that reaches the bottom portion 1802 of the hole 18, when the grout material filling insertion member 30 is inserted into the casing C, the lower portion of the bag body 36 is placed at the bottom portion of the hole 18. 1802 can be reliably guided to the inner peripheral surface of the hole 18 and the inner peripheral surface of the casing C, which is advantageous for reliably pressing the grout material G through the bag body 36, and the strength and rigidity of the micropile 46 can be improved. It becomes advantageous in raising.
In addition, even if it is determined that there are no gaps or cracks in the load supporting ground 22 in the preliminary geological survey, and it is found that there are gaps or cracks in the load supporting ground 22 at the stage of filling the grout material G, the location is not changed. The micropile 46 can be constructed by the same process as described above using the grout material filling insertion member 30 at the same place, which is advantageous in increasing the construction efficiency.

なお、グラウト材供給管３４の長さは、ケーシングＣの上方の箇所までの長さでもよく、あるいは、ケーシングＣの下端と孔１８の底部１８０２との間までの長さとしてもよいが、本実施の形態のようにグラウト材供給管３４の長さを孔１８の底部１８０２の近傍までの長さにすると、グラウト材Ｇの充填を袋体３６の下部から上方へと行なえ、孔１８の内周面およびケーシングＣの内周面に袋体３６を介してグラウト材Ｇを確実に圧接する上で有利となる。   Note that the length of the grout material supply pipe 34 may be the length up to the upper portion of the casing C or the length between the lower end of the casing C and the bottom portion 1802 of the hole 18. When the length of the grout material supply pipe 34 is set to the length close to the bottom 1802 of the hole 18 as in the embodiment, the grout material G can be filled upward from the lower portion of the bag body 36, This is advantageous in reliably pressing the grout material G to the peripheral surface and the inner peripheral surface of the casing C via the bag body 36.

１０ ケーシングセグメント
１４ 削孔ドリル
１６ ロッド
１８ 孔
１８０２ 底部
２０ 上層地盤
２２ 荷重支持地盤
３０ グラウト材充填具
３２ グラウト材充填用挿入部材
３４ グラウト材供給管
３４０２ グラウト材供給口
３４０４ グラウト材吐出口
３６ 袋体
４０ 鉄筋
４４ 沈下防止板
４６ マイクロパイル
Ｃ ケーシング
Ｇ グラウト材 DESCRIPTION OF SYMBOLS 10 Casing segment 14 Drilling hole drill 16 Rod 18 Hole 1802 Bottom part 20 Upper layer ground 22 Load support ground 30 Grout material filling tool 32 Grout material filling insertion member 34 Grout material supply pipe 3402 Grout material supply port 3404 Grout material discharge port 36 Bag body 40 Reinforcement 44 Settling prevention plate 46 Micropile C Casing G Grout material

Claims (10)

ケーシングセグメントとその内部に配置された削孔ドリルとを回転させつつ、また、前記ケーシングセグメントと前記削孔ドリルのロッドとを継ぎ足しつつ削孔する工程と、
前記削孔された孔が上層地盤の下の荷重支持地盤の所定の深さに到達した時点で、前記継ぎ足された複数のケーシングセグメントにより形成されたケーシングの内部から前記削孔ドリルを引き抜く工程と、
前記荷重支持地盤内で前記ケーシングを所定量引き上げる工程と、
を備えるマイクロパイル工法において、
長手方向の両端が開口部とされた細長の袋体を設け、
鉄筋と、長手方向の一端にグラウト材供給口を有し他端にグラウト材吐出口を有し前記鉄筋に取着されたグラウト材供給管とを設け、
長手方向の両端を前記両端の開口部から突出させて前記鉄筋を前記袋体に挿通すると共に、前記グラウト材供給口を前記一方の開口部から突出させて前記グラウト材供給管を前記袋体に挿入し前記グラウト材吐出口を前記袋体の内部に位置させ、前記一方の開口部の周囲の前記袋体の箇所を前記鉄筋と前記グラウト材供給管とに取着すると共に前記両端の開口部のうちの他方の開口部の周囲の前記袋体の箇所を前記鉄筋に取着し、前記袋体を前記鉄筋と前記グラウト材供給管に巻き付けたグラウト材充填用挿入部材を設け、
前記引き抜く工程の後で前記引き上げる工程の前に、前記グラウト材充填用挿入部材を前記ケーシングの内部に挿入し、
前記引き上げる工程の後に、前記グラウト材吐出口から前記袋体の内部にグラウト材を充填して前記孔の内周面に前記袋体の外周面を圧接されると共に、前記荷重支持地盤から前記上層地盤に位置する前記ケーシング部分の内周面に前記袋体の外周面を圧接させ、
さらに、前記袋体の上方に位置するケーシングの内部にグラウト材を充填するようにした、
ことを特徴とするマイクロパイル工法。 A step of drilling while rotating the casing segment and a drill drill disposed therein, and adding the casing segment and the rod of the drill drill;
A step of pulling out the drilling drill from the inside of the casing formed by the plurality of casing segments added when the drilled hole reaches a predetermined depth of the load supporting ground below the upper layer ground; ,
A step of raising the casing by a predetermined amount in the load supporting ground;
In the micropile construction method comprising
Provide a long and narrow bag body with both ends in the longitudinal direction as openings.
A reinforcing bar, and a grout material supply pipe attached to the reinforcing bar having a grout material supply port at one end in the longitudinal direction and a grout material discharge port at the other end;
Both ends in the longitudinal direction protrude from the openings at both ends, and the reinforcing bar is inserted through the bag body, and the grout material supply port protrudes from the one opening portion to connect the grout material supply pipe to the bag body. Inserting and positioning the grout material discharge port inside the bag body, attaching the position of the bag body around the one opening to the reinforcing bar and the grout material supply pipe, and opening the both ends A portion of the bag body around the other opening is attached to the reinforcing bar, and a grout material filling insertion member is provided in which the bag body is wound around the reinforcing bar and the grout material supply pipe.
After the pulling step and before the pulling step, the grout material filling insertion member is inserted into the casing,
After the step of pulling up, the grout material is filled into the bag body from the grout material discharge port, the outer peripheral surface of the bag body is pressed against the inner peripheral surface of the hole, and the upper layer from the load supporting ground. The outer peripheral surface of the bag body is press-contacted to the inner peripheral surface of the casing portion located on the ground,
Furthermore, the grout material was filled inside the casing located above the bag body,
A micropile construction method characterized by this. 前記鉄筋の下端に、前記グラウト材充填用挿入部材の外径よりも大きい外径の沈下防止板が取着されている、
ことを特徴とする請求項１記載のマイクロパイル工法。 A lowering prevention plate having an outer diameter larger than the outer diameter of the grout material filling insertion member is attached to the lower end of the reinforcing bar,
The micropile construction method according to claim 1, wherein: 前記袋体は、半不透水性および可撓性を有する材料でメッシュ材を含んで構成されている、
ことを特徴とする請求項１または２記載のマイクロパイル工法。 The bag body is configured to include a mesh material with a semi-impermeable and flexible material,
The micropile construction method according to claim 1 or 2, characterized in that: 前記鉄筋は、前記ケーシングの上端から前記所定の深さに到達した孔の底部に届く長さを有している、
ことを特徴とする請求項１〜３の何れか１項記載のマイクロパイル工法。 The rebar has a length that reaches the bottom of the hole that reaches the predetermined depth from the upper end of the casing.
The micropile construction method according to any one of claims 1 to 3, wherein 前記グラウト材供給管は耐圧ホースで構成され、
前記耐圧ホースの長手方向の一端がグラウト材供給口となっており、長手方向の他端が前記グラウト材吐出口となっている、
ことを特徴とする請求項１〜４の何れか１項記載のマイクロパイル工法。 The grout material supply pipe is composed of a pressure hose,
One end in the longitudinal direction of the pressure hose is a grout material supply port, and the other end in the longitudinal direction is the grout material discharge port.
The micropile construction method according to any one of claims 1 to 4, wherein マイクロパイル工法において、継ぎ足された複数のケーシングセグメントとその内部に配置された削孔ドリルにより削孔される孔が、上層地盤の下の荷重支持地盤の所定の深さに到達した時点で、前記継ぎ足された複数のケーシングセグメントにより形成されたケーシングの内部に挿入されるグラウト材充填用挿入部材であって、
前記グラウト材充填用挿入部材は、長手方向の両端が開口部とされた細長の袋体と、その長手方向の両端が前記両端の開口部から突出させて前記袋体に挿通された鉄筋と、前記鉄筋に取着され長手方向の一端のグラウト材供給口を前記両端の開口部のうちの一方の開口部から突出させて前記袋体に挿入され長手方向の他端のグラウト材吐出口が前記袋体の内部に位置するグラウト材供給管とを備え、
前記グラウト材充填用挿入部材は、前記一方の開口部の周囲の前記袋体の箇所が前記鉄筋と前記グラウト材供給管とに取着されると共に前記両端の開口部のうちの他方の開口部の周囲の前記袋体の箇所が前記鉄筋に取着され、前記袋体が前記鉄筋と前記グラウト材供給管に巻き付けられて構成され、
前記袋体は、前記グラウト材供給管から前記グラウト材吐出口を介して前記袋体の内部にグラウト材が充填されると、前記孔の内周面よりも大きい寸法の外径で膨出可能である、
ことを特徴とするマイクロパイル工法で用いるグラウト材充填用挿入部材。 In the micropile method, when the holes drilled by the drilled casing drills and the drill holes disposed therein reach a predetermined depth of the load supporting ground below the upper ground, An insertion member for filling a grout material to be inserted into a casing formed by a plurality of joined casing segments,
The insertion member for filling the grout material is an elongated bag body having both ends in the longitudinal direction as openings, and reinforcing bars inserted into the bag body with both ends in the longitudinal direction protruding from the openings at both ends, The grout material supply port at one end in the longitudinal direction attached to the reinforcing bar protrudes from one of the openings at both ends and is inserted into the bag body, and the grout material discharge port at the other end in the longitudinal direction is A grout material supply pipe located inside the bag body,
The insertion member for filling the grout material is such that the portion of the bag body around the one opening is attached to the reinforcing bar and the grout material supply pipe, and the other opening of the openings at both ends. A portion of the bag body around is attached to the reinforcing bar, and the bag body is wound around the reinforcing bar and the grout material supply pipe,
When the bag body is filled with the grout material from the grout material supply pipe through the grout material discharge port, the bag body can swell with an outer diameter larger than the inner peripheral surface of the hole. Is,
An insertion member for filling a grout material used in the micropile construction method. 前記鉄筋の下端に、前記袋体が前記鉄筋と前記グラウト材供給管に巻き付けられた前記グラウト材充填用挿入部材の外径よりも大きい外径の沈下防止板が取着されている、
ことを特徴とする請求項６記載のマイクロパイル工法で用いるグラウト材充填用挿入部材。 At the lower end of the reinforcing bar, a settling prevention plate having an outer diameter larger than the outer diameter of the inserting member for filling the grout material, in which the bag is wound around the reinforcing bar and the grout material supply pipe, is attached.
An insertion member for filling a grout material used in the micropile method according to claim 6. 前記袋体は、半不透水性および可撓性を有する材料で形成され、メッシュ材を含んで構成されている、
ことを特徴とする請求項６または７記載のマイクロパイル工法で用いるグラウト材充填用挿入部材。 The bag body is formed of a semi-impermeable and flexible material and includes a mesh material.
8. An insertion member for filling a grout material used in the micropile method according to claim 6 or 7. 前記鉄筋は、前記ケーシングの上端から前記所定の深さに到達した孔の底部に届く長さを有している、
ことを特徴とする請求項６〜８の何れか１項記載のマイクロパイル工法で用いるグラウト材充填用挿入部材。 The rebar has a length that reaches the bottom of the hole that reaches the predetermined depth from the upper end of the casing.
An insertion member for filling a grout material used in the micropile method according to any one of claims 6 to 8. 前記グラウト材供給管は耐圧ホースで構成され、
前記耐圧ホースの長手方向の一端がグラウト材供給口となっており、長手方向の他端が前記グラウト材吐出口となっている、
ことを特徴とする請求項６〜９の何れか１項記載のマイクロパイル工法で用いるグラウト材充填用挿入部材。 The grout material supply pipe is composed of a pressure hose,
One end in the longitudinal direction of the pressure hose is a grout material supply port, and the other end in the longitudinal direction is the grout material discharge port.
An insertion member for filling a grout material used in the micropile method according to any one of claims 6 to 9.
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CN114086543A (en) * 2021-12-20 2022-02-25 上海勘察设计研究院(集团)有限公司 Steel pipe pile internal segmented grouting structure and using method thereof

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