JP5963350B2 - Solidification pile construction device and solidification pile construction method - Google Patents

Solidification pile construction device and solidification pile construction method Download PDF

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JP5963350B2
JP5963350B2 JP2012104378A JP2012104378A JP5963350B2 JP 5963350 B2 JP5963350 B2 JP 5963350B2 JP 2012104378 A JP2012104378 A JP 2012104378A JP 2012104378 A JP2012104378 A JP 2012104378A JP 5963350 B2 JP5963350 B2 JP 5963350B2
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reducing agent
load current
compressed air
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JP2013231319A (en
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磯谷 修二
修二 磯谷
辰夫 高橋
辰夫 高橋
英次 渡邊
英次 渡邊
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Fudo Tetra Corp
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Description

本発明は、回転軸に装備された撹拌翼内に付設された混合エジェクターから撹拌抵抗低減剤を地盤中に吐出し、撹拌翼の撹拌抵抗を低減させる固化処理杭造成装置及び固化処理杭の造成方法に関するものである。   The present invention relates to a solidified pile forming apparatus and a solidified pile for reducing a stirring resistance of a stirring blade by discharging a stirring resistance reducing agent into a ground from a mixing ejector provided in a stirring blade mounted on a rotating shaft. It is about the method.

地盤の改良工法の一つに固化処理杭造成工法がある。この固化杭造成工法は、例えば図10に示すように、機械式撹拌装置100の先端を、施工する柱体の芯に合わせて回転軸101を回転させ、回転軸101の下部に放射状に設けた1以上の撹拌翼102a、102bの回転域の地盤中に、回転軸101の所定位置に付設された固化材吐出管口103から固化材を吐出させ、原位置土と撹拌混合しながら貫入を行い、設計深度に達したところで吐出を停止し、回転軸101をそのまま回転又は逆転して、更に撹拌混合しながら引き抜いて柱状体を造成する工法である。図10中、符号121は掘削ビットである。   One of the ground improvement methods is the solidification pile construction method. In this solidified pile construction method, for example, as shown in FIG. 10, the rotation shaft 101 is rotated in accordance with the core of the column to be constructed, and the tip of the mechanical stirring device 100 is provided radially below the rotation shaft 101. The solidification material is discharged from the solidification material discharge pipe port 103 provided at a predetermined position of the rotary shaft 101 into the ground of the rotation region of the one or more stirring blades 102a and 102b, and penetrated while stirring and mixing with the original soil. In this construction method, the discharge is stopped when the design depth is reached, the rotating shaft 101 is rotated or reversed as it is, and further extracted while stirring and mixing to form a columnar body. In FIG. 10, reference numeral 121 denotes a drill bit.

また、特開2003−74049号公報には、地上の供給手段に接続される第1圧縮空気供給管及び液状物供給管と、前記液状物供給管から導入される液状物を、前記第1圧縮空気供給管から導入される圧縮空気に同伴させる、前記攪拌翼の外側端近傍に付設され吐出口を外側に向けた混合エジェクターを備える固化処理杭の造成装置が開示されている。該固化処理杭造成装置によれば、攪拌翼径の外側をも混合処理が可能となる。   Japanese Patent Application Laid-Open No. 2003-74049 discloses a first compressed air supply pipe and a liquid substance supply pipe connected to a ground supply means, and a liquid substance introduced from the liquid substance supply pipe. An apparatus for creating a solidified pile that includes a mixed ejector attached to the vicinity of the outer end of the stirring blade and having a discharge port facing outward, which is accompanied by compressed air introduced from an air supply pipe, is disclosed. According to the solidified pile forming apparatus, the mixing process can be performed on the outside of the stirring blade diameter.

このような機械式撹拌装置に装着される回転駆動手段(以下「オーガモーター」とも言う。)は、使用する撹拌装置の撹拌能力から決められるものであり、小型施工機における撹拌装置の撹拌能力は一般に小さく、大型施工機における撹拌装置の撹拌能力は大きなオーガモーターが装備される。そして、このような機械式撹拌装置の撹拌能力の大小は、改良対象となる地盤の土性図等により決定される。   The rotational drive means (hereinafter also referred to as “auger motor”) attached to such a mechanical stirrer is determined by the stirrer ability of the stirrer used, and the stirrer ability of the stirrer in a small construction machine is In general, a large auger motor is equipped with a stirring capacity of a stirring device in a small and large construction machine. And the magnitude of the stirring capability of such a mechanical stirring device is determined by the soil map of the ground to be improved.

特開2003−74049号公報JP 2003-74049 A

しかしながら、地盤土性図等よる撹拌装置の選定において、掘削撹拌に支障がおきないよう、余裕を見て撹拌能力が大きな大型機械式撹拌装置を準備することは、不経済である。また、撹拌能力を抑えた機械式撹拌装置を用いる場合、地盤を掘削する負荷電流が全負荷電流を超えることがあり、この場合、機械式撹拌装置の貫入に支障をきたすという問題がある。   However, it is uneconomical to prepare a large mechanical stirring device with a large stirring capacity so as not to hinder excavation stirring in the selection of the stirring device based on the ground soil map or the like. In addition, when a mechanical stirring device with a reduced stirring capacity is used, the load current for excavating the ground may exceed the full load current. In this case, there is a problem that the penetration of the mechanical stirring device is hindered.

このような問題を大掛りな施工装置を使用することなく解決する場合、従来、貫入工程において、高圧水ジェットを撹拌翼近傍から吐出し、原地盤土を緩めることにより、掘削撹拌抵抗を低減しながら、所定深度まで貫入を行っていた。この場合、高圧水ジェットの水量により原地盤土を含んだ排泥が多量に発生し、装置設置の足場が不安定となったり、排泥処分費が嵩み不経済となるという問題がある。   When solving such a problem without using a large construction device, conventionally, in the intrusion process, the high pressure water jet is discharged from the vicinity of the stirring blade and the ground soil is loosened to reduce the excavation stirring resistance. However, it was penetrating to a predetermined depth. In this case, there is a problem that a large amount of mud containing the ground soil is generated due to the amount of water of the high-pressure water jet, the scaffold for installing the apparatus becomes unstable, and the waste disposal cost increases and becomes uneconomical.

従って、本発明の目的は、上記従来の問題点を解決したものであって、大掛かりな施工装置を使用することなく、地盤を掘削する負荷電流が全負荷電流を超える場合であっても、回転軸の貫入に支障をきたすことがない固化処理杭造成装置及び固化処理杭の造成方法を提供することにある。   Therefore, the object of the present invention is to solve the above-mentioned conventional problems, and even if the load current for excavating the ground exceeds the full load current without using a large construction device, the rotation An object of the present invention is to provide a solidified pile forming apparatus and a solidified pile forming method that do not hinder shaft penetration.

かかる実情において、本発明者らは鋭意検討を行った結果、回転軸の負荷電流を監視し、撹拌装置の全負荷電流近傍で定められる上限値を超える場合、撹拌抵抗低減剤を吐出すれば、負荷電流が低減され、能力を超える地盤への貫入がスムーズに行われるため、小型機の能力でも大型機並の施工が可能となること等を見出し、本発明を完成するに至った。   In such a situation, as a result of intensive studies, the present inventors have monitored the load current of the rotating shaft, and when exceeding the upper limit value determined in the vicinity of the total load current of the stirring device, if the stirring resistance reducing agent is discharged, Since the load current is reduced and the penetration into the ground exceeding the capacity is smoothly performed, it has been found that the construction of the large machine can be performed even with the capacity of the small machine, and the present invention has been completed.

また、本発明は、回転駆動手段により回転される中空の回転軸と、該回転軸の下方に放射状に設けた1以上の撹拌翼と、一端が地上の供給手段に接続される途中に切替弁を有する低減剤供給管から供給される撹拌抵抗を低減する低減剤を、一端が地上の供給手段に接続される第1圧縮空気供給管から導入される圧縮空気に同伴させる同伴装置と、該回転軸の中空部に配設され、一端が地上の供給手段に接続される地盤を改良する固化材を供給する固化材供給管と、該同伴装置で得られる低減剤混合噴流を吐出する又は該固化材供給管から導入される固化材を該圧縮空気に同伴させて吐出する該撹拌翼内に付設される第1混合エジェクターと、該回転駆動手段の負荷電流が所定の上限値を超える際、低減剤を吐出し、所定の下限値を下回る際、低減剤の吐出を停止する制御手段と、を備え、該切替弁は、低減剤の供給と低減剤の供給停止を切り替えるものであることを特徴とする固化処理杭造成装置を提供するものである。 In addition, the present invention provides a hollow rotary shaft that is rotated by a rotary drive means, one or more stirring blades provided radially below the rotary shaft, and a switching valve in the middle of one end being connected to the ground supply means. A companion device for bringing a reducing agent for reducing agitation resistance supplied from a reducing agent supply pipe having a compressed air introduced from a first compressed air supply pipe having one end connected to a ground supply means, and the rotation A solidifying material supply pipe for supplying a solidifying material for improving a ground disposed in a hollow portion of the shaft and having one end connected to a ground supply means; and a reducing agent mixed jet obtained by the accompanying device is discharged or solidified. Reduced when the load current of the first mixing ejector attached to the stirring blade that discharges the solidified material introduced from the material supply pipe with the compressed air accompanying the compressed air exceeds a predetermined upper limit value. When the agent is discharged and below the predetermined lower limit, And a control means for stopping the discharge of the reducing agent, the switching valve is intended to provide a solidification pile Construction apparatus according to claim der Rukoto switches the supply stop and supply-reducing agent reducing agent is there.

また、本発明は、該回転軸の中空部に配設され、一端が地上の供給手段に接続される固化材供給管及び一端が地上の供給手段に接続される第2圧縮空気供給管と、該固化材供給管から導入される固化材を、該第2圧縮空気供給管から導入される圧縮空気に同伴させて吐出する該撹拌翼内に付設される第2混合エジェクターを更に、有することを特徴とする前記固化処理杭造成装置を提供するものである。   The present invention also includes a solidified material supply pipe disposed at a hollow portion of the rotating shaft, one end connected to the ground supply means, and a second compressed air supply pipe connected at one end to the ground supply means, A second mixing ejector attached to the stirring blade for discharging the solidified material introduced from the solidified material supply pipe together with the compressed air introduced from the second compressed air supply pipe; The solidified pile forming apparatus as described above is provided.

また、本発明は、前記固化処理杭造成装置を用い、貫入工程は、該回転軸を回転させ原位置土を撹拌し、引き抜き工程は、該第1混合エジェクターから固化材を圧縮空気と共に吐出させ、原位置土と撹拌混合して地中に固化処理杭を造成する方法であって、該制御手段を作動させ、貫入工程は、該回転駆動手段の負荷電流が所定の上限値を超える場合、低減剤を吐出し、該負荷電流が所定の下限値を下回った場合、低減剤の吐出を停止し、引き抜き工程は、該回転駆動手段の負荷電流が所定の上限値を超える場合、低減剤を固化材と共に吐出し、該負荷電流が所定の下限値を下回った場合、低減剤の吐出を停止することを特徴とする固化処理杭の造成方法を提供するものである。   Further, the present invention uses the solidified pile forming apparatus, the penetration step rotates the rotating shaft to stir the original soil, and the drawing step discharges the solidified material from the first mixed ejector together with the compressed air. , A method of creating a solidified pile in the ground by stirring and mixing with the in-situ soil, the control means is operated, and the penetration step is performed when the load current of the rotary drive means exceeds a predetermined upper limit value, When the reducing agent is discharged and the load current falls below a predetermined lower limit value, the discharging of the reducing agent is stopped, and when the load current of the rotation drive means exceeds the predetermined upper limit value, the reducing agent is discharged. The present invention provides a method for producing a solidified pile, which is discharged together with a solidified material and stops discharge of the reducing agent when the load current falls below a predetermined lower limit value.

また、本発明は、前記固化処理杭造成装置を用い、貫入工程は、該回転軸を回転させ原位置土を撹拌し、引き抜き工程は、該第1混合エジェクター又は第2混合エジェクターから固化材を圧縮空気と共に吐出させ、原位置土と撹拌混合して地中に固化処理杭を造成する方法であって、該制御手段を作動させ、貫入工程は、該回転駆動手段の負荷電流が所定の上限値を超える場合、低減剤を吐出し、該負荷電流が所定の下限値を下回った場合、低減剤の吐出を停止し、引き抜き工程は、該回転駆動手段の負荷電流が所定の上限値を超える場合、該第1混合エジェクターから低減剤を固化材と共に吐出し、該負荷電流が所定の下限値を下回った場合、低減剤の吐出を停止することを特徴とする固化処理杭の造成方法を提供するものである。   Moreover, this invention uses the said solidification processing pile creation apparatus, an intrusion process rotates this rotating shaft, agitates in-situ soil, and a drawing-out process removes a solidification material from this 1st mixing ejector or a 2nd mixing ejector. It is a method of discharging with compressed air, stirring and mixing with in-situ soil, and creating a solidified pile in the ground. The control means is operated, and the penetration step is such that the load current of the rotary drive means is a predetermined upper limit. When the value exceeds the value, the reducing agent is discharged, and when the load current falls below a predetermined lower limit value, the discharge of the reducing agent is stopped, and in the drawing process, the load current of the rotary drive means exceeds the predetermined upper limit value. In this case, a reducing agent is discharged from the first mixed ejector together with the solidifying material, and when the load current falls below a predetermined lower limit value, the discharging of the reducing agent is stopped. To do.

本発明において、回転軸の貫入工程及び引き抜き工程において、地盤を掘削する負荷電流が、例えば全負荷電流を超える場合、これを感知して低減剤を圧縮空気と共に、噴出するため、原位置土の塊等を粉砕し、且つ粉砕した土や土粒子の粒子間に低減剤が作用することで流動性を高めることができる。このため、撹拌翼の抵抗が減り、回転軸の貫入に支障をきたすことがない。また、より大型の撹拌装置を必要とせず回転軸を容易に所定深度まで貫入することができる。また、低減剤を吐出後、負荷電流が、例えば所定の下限値を下回る場合、これを感知して低減剤の吐出を停止すれば、低減剤の無駄な使用を減らすことができる。   In the present invention, when the load current for excavating the ground exceeds, for example, the total load current in the penetration process and the drawing process of the rotating shaft, this is detected and the reducing agent is ejected together with the compressed air. Fluidity can be improved by crushing a lump and the like, and a reducing agent acting between the crushed soil and soil particles. For this reason, the resistance of the stirring blade is reduced, and the penetration of the rotating shaft is not hindered. Further, the rotating shaft can be easily penetrated to a predetermined depth without requiring a larger stirring device. Further, if the load current falls below, for example, a predetermined lower limit after discharging the reducing agent, useless use of the reducing agent can be reduced by detecting this and stopping the discharging of the reducing agent.

本発明の第1の実施の形態における固化処理杭造成装置の模式図である。It is a mimetic diagram of a solidification processing pile creation device in a 1st embodiment of the present invention. 第1の実施の形態例で使用する圧縮空気、固化材及び低減剤の吐出を制御する制御手段のブロック図である。It is a block diagram of the control means which controls discharge of the compressed air, the solidification material, and the reducing agent which are used in the first embodiment. 図1の固化処理杭造成装置の部分拡大簡略図である。It is the elements on larger scale of the solidification processing pile creation apparatus of FIG. 回転駆動手段の電流−トルク曲線図の一例である。It is an example of the electric current-torque curve figure of a rotation drive means. 本発明の第2の実施の形態における固化処理杭造成装置の模式図である。It is a schematic diagram of the solidification pile creation apparatus in the 2nd Embodiment of this invention. 同伴装置の簡略図である。It is a simplified diagram of a companion device. 第2の実施の形態例で使用する圧縮空気及び固化材の吐出を制御する制御手段のブロック図である。It is a block diagram of the control means which controls discharge of the compressed air and solidification material which are used in the second embodiment. 本発明の第3の実施の形態における固化処理杭造成装置の模式図である。It is a schematic diagram of the solidification pile creation apparatus in the 3rd Embodiment of this invention. 第3の実施の形態例で使用する圧縮空気、固化材及び低減剤の吐出を制御する制御手段のブロック図である。It is a block diagram of the control means which controls discharge of the compressed air, the solidification material, and the reducing agent which are used in the third embodiment. 従来の固化処理杭造成装置の概略図である。It is the schematic of the conventional solidification processing pile creation apparatus.

次に、本発明の第1の実施の形態における固化処理杭造成装置を図1〜図4を参照して説明する。固化処理杭造成装置10は、回転駆動手段により回転される中空の回転軸1と、回転軸1の下方に放射状に設けた1以上の撹拌翼2と、回転軸1の中空部に配設され、一端が地上の供給手段8aに接続される第1圧縮空気供給管3及び分岐の一端が地上の低減剤供給手段6に接続される撹拌抵抗を低減させる低減剤又は分岐の他端が地上の固化材供給手段7に接続される地盤を改良する固化材を供給する兼用供給管4と、兼用供給管4から導入される低減剤又は固化材を、第1圧縮空気供給管8aから導入される圧縮空気に同伴させて吐出する撹拌翼2内に付設される第1混合エジェクター5と、制御手段20とを備える。なお、低減剤及び固化材は共に、液状物として使用する。   Next, the solidification processing pile creation apparatus in the 1st Embodiment of this invention is demonstrated with reference to FIGS. The solidified pile forming apparatus 10 is disposed in a hollow rotating shaft 1 rotated by a rotation driving means, one or more stirring blades 2 provided radially below the rotating shaft 1, and a hollow portion of the rotating shaft 1. The first compressed air supply pipe 3 having one end connected to the ground supply means 8a and the other end of the branch connected to the ground reducing agent supply means 6 are connected to the ground reducing means supply means 8a. The combined supply pipe 4 for supplying the solidified material for improving the ground connected to the solidified material supply means 7 and the reducing agent or the solidified material introduced from the combined supply pipe 4 are introduced from the first compressed air supply pipe 8a. A first mixing ejector 5 attached to the stirring blade 2 that discharges the compressed air accompanying the compressed air, and a control means 20 are provided. Both the reducing agent and the solidifying material are used as liquid materials.

兼用供給管4の分岐点に設置される切替弁11は、切替えにより、兼用供給管4と低減剤供給手段6の接続、兼用供給管4と固化材供給手段7の接続及び兼用供給管4と低減剤供給手段6及び固化材供給手段7との接続を可能にしている。すなわち、切替弁11の切替えにより、兼用供給管4に、低減剤のみの供給、固化材のみの供給及び低減剤と固化材両方の供給と3通りの供給を可能にするものである。これにより、例えば、固化材のみを吐出中に、低減剤を吐出して、固化材と低減剤の双方の供給が可能となる。   The switching valve 11 installed at the branch point of the dual-purpose supply pipe 4 is switched to connect the dual-purpose supply pipe 4 and the reducing agent supply means 6, connect the dual-purpose supply pipe 4 and the solidifying material supply means 7, and the dual-purpose supply pipe 4. Connection with the reducing agent supply means 6 and the solidifying material supply means 7 is made possible. That is, by switching the switching valve 11, the dual-purpose supply pipe 4 can be supplied with only the reducing agent, only the solidifying material, and both the reducing agent and the solidifying material. Thereby, for example, it is possible to supply both the solidifying material and the reducing agent by discharging the reducing agent while discharging only the solidifying material.

第1混合エジェクター5は、撹拌翼2内に設置されるが、特に、撹拌翼2の中央近傍に位置させ、且つ吐出口51を撹拌翼2の正回転方向前方に向けて付設することが、低減剤と圧縮空気の噴流物が撹拌翼の回転方向正面に位置する原位置土に高速でぶつけることができ、土の塊を粉砕する作用力が高まる点で好ましい。撹拌翼2の中央近傍とは、放射状に設けた撹拌翼2の放射方向(杭の径方向)における中央付近であり、多少の前後はあってもよい。また、第1混合エジェクター5は、上から見て撹拌翼内に納まる形状とすることが、撹拌翼2から突出する部分が無くなる点で好ましい。撹拌翼2から突出する部分があると、撹拌抵抗により損傷する恐れがでてくる。   The first mixing ejector 5 is installed in the stirring blade 2, and in particular, the first mixing ejector 5 is positioned near the center of the stirring blade 2 and the discharge port 51 is attached to the front in the forward rotation direction of the stirring blade 2. The reducing agent and the jet of compressed air are preferable because they can hit the in-situ soil located in front of the agitating blade in the rotational direction at a high speed, and the working force for crushing the lump of soil is increased. The vicinity of the center of the stirring blade 2 is the vicinity of the center in the radial direction of the stirring blade 2 provided radially (the radial direction of the pile), and there may be some front and back. Moreover, it is preferable that the first mixing ejector 5 has a shape that can be accommodated in the stirring blade as viewed from above, since there is no portion protruding from the stirring blade 2. If there is a portion protruding from the stirring blade 2, it may be damaged by stirring resistance.

制御手段20は、回転駆動手段の負荷電流が所定の上限値を超える際、低減剤を吐出し、所定の下限値を下回る際、低減剤の吐出を停止する。所定の上限値は、撹拌装置の全負荷電流の70%〜100%、好ましくは全負荷電流の90%〜100%とすることが、低減剤の浪費にならず、且つ回転駆動手段の保護の点で好ましい。また、所定の下限値は、該所定の上限値の80%以上、100%未満、好ましくは、該所定の上限値の90%以上、100%未満とすることが、低減剤を節減できる点で好ましい。   The control unit 20 discharges the reducing agent when the load current of the rotation driving unit exceeds a predetermined upper limit value, and stops discharging the reducing agent when the load current falls below the predetermined lower limit value. The predetermined upper limit value is 70% to 100% of the total load current of the agitator, preferably 90% to 100% of the full load current, so that the reducing agent is not wasted and the rotation drive means is protected. This is preferable. Further, the predetermined lower limit value is 80% or more and less than 100% of the predetermined upper limit value, preferably 90% or more and less than 100% of the predetermined upper limit value, in that the reducing agent can be saved. preferable.

回転軸1の上端には不図示の回転駆動手段(オーガモーター)が設置され、これにより回転軸1は回転される。すなわち、施工時には、回転軸1が不図示のベースマシン側の支持リーダー及びウインチ等を介して移動可能に支持されて、地盤中へ貫入されたり、地表に引き抜かれたりする。回転駆動手段では、回転軸1を電動モーター及び減速装置を介して正転、逆転するもので、全体が回転軸1と共に、リーダーに沿って昇降される。   A rotation driving means (auger motor) (not shown) is installed at the upper end of the rotating shaft 1, and thereby the rotating shaft 1 is rotated. That is, at the time of construction, the rotary shaft 1 is supported so as to be movable via a support leader and winch (not shown) on the base machine side, and penetrates into the ground or is pulled out to the ground surface. In the rotation driving means, the rotary shaft 1 is rotated forward and reverse through an electric motor and a speed reducer, and the whole is moved up and down along with the rotary shaft 1 along the leader.

本例に用いるオーガモーターの電流−トルク曲線を図4に示す。電動機は通常4極(4Pと表す)と8極(8Pと表す)で示され、貫入時は8Pを選択し全負荷電流が大きく時間当たり少ない回転数で貫入を行う。また、引抜時は4Pを選択し全負荷電流は理論上8Pの79%となるが、時間当たり回転数は2倍とすることができる。次に、全負荷電流について説明する。全負荷電流とは、モーターの100%出力時の入力電流値を表し、全負荷電流で運転できればオーガー性能を安定的に出力し続けることができる。本例の所定の上限値を全負荷電流とした場合、上限値を図4にて説明すると、当該オーガーは50Hz−8Pの場合、全負荷電流は375A(アンペア)のように求められ、50Hz−4Pでの全負荷電流は298Aが求められる。通常貫入過程では、定格トルクは50Hz−8Pを選択するので、この全負荷電流375Aが上限値として、演算部22に設定される。   FIG. 4 shows a current-torque curve of the auger motor used in this example. The electric motor is usually shown with 4 poles (represented as 4P) and 8 poles (represented as 8P). When penetrating, 8P is selected, and the penetration is performed at a high rotational speed with a small total load current. Further, 4P is selected at the time of drawing, and the total load current is theoretically 79% of 8P, but the number of rotations per hour can be doubled. Next, the full load current will be described. The full load current represents the input current value at the time of 100% output of the motor, and if it can be operated at the full load current, the auger performance can be continuously output stably. When the predetermined upper limit value of this example is the full load current, the upper limit value will be described with reference to FIG. 4. When the auger is 50 Hz-8P, the full load current is obtained as 375 A (ampere), and 50 Hz- The total load current at 4P is required to be 298A. In the normal penetration process, 50 Hz-8P is selected as the rated torque, and this full load current 375A is set in the calculation unit 22 as an upper limit value.

制御手段20は、具体的には、負荷電流センサー21、演算部22、低減剤制御部23、圧縮空気演算処理部24、低減剤演算処理部25及び固化材演算処理部26とから構成される。演算部22は、所定の上限値と負荷電流センサー21から送られる信号との比較演算、所定の下限値と負荷電流センサー21から送られる信号との比較演算を行い、当該演算の結果を低減剤制御部23に送信する機能を有する。低減剤制御部23は、比較演算の結果から低減剤吐出信号又は低減剤停止信号に基づき、低減剤の吐出又は停止を低減剤演算処理部25を通じて低減剤供給手段6に指示し、圧縮空気の供給又は停止を圧縮空気演算処理部24を通じて圧縮空気供給手段8aに指示する機能を有する。また、固化材の吐出又は停止は演算部の結果によらず施工条件で機能させることができるが、演算部22の信号を固化材演算処理部26に送ることで、施工条件に応じて、固化材の吐出量等を変更することもできる。なお、図1中、符号12はスイベル管である。   Specifically, the control unit 20 includes a load current sensor 21, a calculation unit 22, a reducing agent control unit 23, a compressed air calculation processing unit 24, a reducing agent calculation processing unit 25, and a solidified material calculation processing unit 26. . The calculation unit 22 performs a comparison operation between the predetermined upper limit value and the signal sent from the load current sensor 21, and performs a comparison calculation between the predetermined lower limit value and the signal sent from the load current sensor 21, and the result of the calculation is reduced. It has the function to transmit to the control part 23. Based on the result of the comparison calculation, the reducing agent control unit 23 instructs the reducing agent supply means 6 through the reducing agent calculation processing unit 25 to discharge or stop the reducing agent based on the reducing agent discharge signal or the reducing agent stop signal. It has a function to instruct the compressed air supply means 8a through the compressed air calculation processing unit 24 to supply or stop. The discharge or stop of the solidifying material can be made to function under the construction conditions regardless of the result of the calculation unit, but by sending the signal of the calculation unit 22 to the solidification material calculation processing unit 26, the solidification material can be solidified according to the construction conditions. It is also possible to change the discharge amount of the material. In FIG. 1, reference numeral 12 denotes a swivel pipe.

次に、固化処理杭造成装置10を用いた固化処理杭造成方法を説明する。貫入工程は、固化材を吐出せず、回転軸1を回転させ原位置土を撹拌する工程である。貫入工程において、回転軸1を正回転方向に回転させて、地盤中に貫入していくと、地盤と撹拌翼の抵抗から負荷電流が発生する。回転駆動手段の負荷電流が所定の上限値を超える場合、制御手段20から低減剤及び圧縮空気の吐出信号が発せられ、第1混合エジェクター5から低減剤を圧縮空気と共に吐出する。これにより、撹拌抵抗を高める原因となっている原位置土の塊等を粉砕すると共に、粉砕した土や土粒子の粒子間に低減剤が作用することで流動性を高めることができる。このため、撹拌翼の抵抗が減り、回転軸1の貫入が円滑に進む。なお、低減剤の吐出量は、予め実験室における模擬試験あるいは過去の種々のデータ等を含めて決定される。また、貫入工程において、第1混合エジェクター5から低減剤を吐出しない状態においては、圧縮空気を吐出させておくことが、吐出口を詰まらせることがない点で好ましい。   Next, the solidification pile creation method using the solidification pile creation apparatus 10 will be described. The penetration step is a step of stirring the original soil by rotating the rotary shaft 1 without discharging the solidified material. In the penetration step, when the rotary shaft 1 is rotated in the forward rotation direction and penetrates into the ground, a load current is generated from the resistance of the ground and the stirring blades. When the load current of the rotation driving unit exceeds a predetermined upper limit value, a discharge signal of the reducing agent and compressed air is issued from the control unit 20 and the reducing agent is discharged from the first mixing ejector 5 together with the compressed air. Thereby, while the in-soil lump etc. which are the cause which raises stirring resistance are grind | pulverized, fluidity | liquidity can be improved because a reducing agent acts between the particle | grains of the grind | pulverized soil and soil particle | grains. For this reason, the resistance of the stirring blade is reduced, and the penetration of the rotating shaft 1 proceeds smoothly. The discharge amount of the reducing agent is determined in advance by including a simulation test in the laboratory or various past data. In the penetration step, in a state where the reducing agent is not discharged from the first mixing ejector 5, it is preferable to discharge the compressed air from the viewpoint of not clogging the discharge port.

低減剤吐出過程において、負荷電流が下限値を下回った場合、制御手段20から低減剤吐出停止信号が発せられ、第1混合エジェクター5からの低減剤と圧縮空気の吐出を停止する。低減剤吐出過程において、負荷電流は全負荷電流以下であるため、低減剤の吐出を停止しても問題はないと共に、低減剤の無駄な使用を抑制できる。低減剤の吐出を停止した後、負荷電流が上昇し、再び所定の上限値を超える場合、第1混合エジェクター5から低減剤を圧縮空気と共に吐出する。このように、負荷電流を全負荷電流以下であって、所定の上限値と下限値の間となるように監視し、低減剤の吐出及び吐出停止を繰り返すことで、回転軸1の円滑な貫入が可能となる。   In the reducing agent discharge process, when the load current falls below the lower limit value, a reducing agent discharge stop signal is issued from the control means 20, and the discharge of the reducing agent and compressed air from the first mixing ejector 5 is stopped. In the reducing agent discharge process, since the load current is equal to or less than the full load current, there is no problem even if the discharge of the reducing agent is stopped, and wasteful use of the reducing agent can be suppressed. After the discharge of the reducing agent is stopped, when the load current increases and exceeds the predetermined upper limit again, the reducing agent is discharged from the first mixing ejector 5 together with the compressed air. As described above, the load current is monitored to be equal to or less than the full load current and between the predetermined upper limit value and the lower limit value, and by smoothly discharging and stopping the discharge of the reducing agent, the rotation shaft 1 can be smoothly penetrated. Is possible.

引き抜き工程は、回転軸1を逆回転させつつ、地上に引き上げる工程であって、第1混合エジェクター5から固化材(セメントミルク)が圧縮空気と共に、吐出される。固化材と圧縮空気の噴流物は、分散又は細分化された状態で原位置土に高速でぶつかるため、流動性が高まった地盤中に効率よく撹拌混合されるため撹拌地盤が高度に均一化される。均一化の程度が高まると固化材の使用量を低減でき、また、固化材の使用量を維持すれば、固化後の処理杭9の強度を高めることができる。引き抜き工程において、回転駆動手段の負荷電流が所定の上限値を超える場合、制御手段20から低減剤吐出信号が発せられ、第1混合エジェクター5から低減剤が固化材及び圧縮空気と共に吐出される。これにより、撹拌抵抗を高める原因となっている原位置土の塊等を粉砕すると共に、粉砕した土や土粒子の粒子間に低減剤が作用して流動性を高める。なお、貫入工程において、地盤は撹拌されており、引き抜き工程において、低減剤の吐出頻度は少ないものとなる。   The drawing step is a step of pulling the rotating shaft 1 to the ground while rotating the rotary shaft 1 in the reverse direction, and the solidified material (cement milk) is discharged together with the compressed air from the first mixing ejector 5. Since the jet of solidified material and compressed air collides with the in-situ soil in a dispersed or fragmented state, it is efficiently agitated and mixed in the ground with increased fluidity. The If the degree of homogenization increases, the amount of solidified material used can be reduced, and if the amount of solidified material used is maintained, the strength of the treated pile 9 after solidification can be increased. In the drawing process, when the load current of the rotation driving unit exceeds a predetermined upper limit value, a reducing agent discharge signal is issued from the control unit 20 and the reducing agent is discharged from the first mixing ejector 5 together with the solidified material and the compressed air. As a result, the in-soil lump, which is the cause of increasing the stirring resistance, is pulverized, and a reducing agent acts between the pulverized soil and soil particles to increase fluidity. In the penetration process, the ground is agitated, and in the drawing process, the discharge frequency of the reducing agent is low.

引き抜き工程であって、且つ低減剤吐出過程において、負荷電流が下限値を下回った場合、制御手段20から低減剤吐出停止信号が発せられ、第1混合エジェクター5からの低減剤の吐出を停止する。低減剤吐出過程において、負荷電流は全負荷電流以下であるため、低減剤の吐出を停止しても問題はなく固化処理杭を造成できると共に、低減剤の無駄な使用を抑制できる。低減剤の吐出を停止した後、負荷電流が上昇し、再び所定の上限値を超える場合、制御手段20から低減剤吐出信号が発せられ、第1混合エジェクター5から固化材と共に低減剤を吐出する。このように、引き抜き工程において、負荷電流を全負荷電流以下であって、所定の上限値と下限値の間となるように監視し、低減剤の吐出及び吐出停止を繰り返すことで、回転軸1の円滑な貫入が可能となる。   When the load current falls below the lower limit value in the drawing step and the reducing agent discharge process, a reducing agent discharge stop signal is issued from the control means 20, and the discharge of the reducing agent from the first mixing ejector 5 is stopped. . In the reducing agent discharge process, the load current is less than or equal to the full load current, so there is no problem even if the discharge of the reducing agent is stopped, and a solidified pile can be formed and wasteful use of the reducing agent can be suppressed. After stopping the discharge of the reducing agent, when the load current increases and exceeds the predetermined upper limit value again, a reducing agent discharge signal is issued from the control means 20 and the reducing agent is discharged from the first mixing ejector 5 together with the solidifying material. . As described above, in the drawing process, the load current is monitored to be equal to or less than the full load current and between the predetermined upper limit value and the lower limit value, and by repeating the discharge and stoppage of the reducing agent, the rotating shaft 1 Smooth intrusion becomes possible.

次に、本発明の第2の実施の形態における固化処理杭造成装置を図5〜図7を参照して説明する。図5〜図7において、図1〜図4と同一構成要素には同一符号を付して、その説明を省略し、異なる点について主に説明する。すなわち、図5〜図7の固化処理杭造成装置10aにおいて、図1〜図4の固化処理杭造成装置10と異なる点は、第1圧縮空気供給配管3を、低減剤を圧縮空気に同伴させた低減剤混合噴流又は圧縮空気を供給する低減剤混合噴流供給配管3aとした点、兼用配管4を、固化材供給配管4aとした点である。すなわち、固化処理杭造成装置10aは、一端が地上の供給手段に接続される途中に切替弁11aを有する低減剤供給管61から供給される撹拌抵抗を低減する低減剤を、一端が地上の供給手段に接続される第1圧縮空気供給管81から導入される圧縮空気に同伴させる同伴装置201と、一端が地上の供給手段に接続される地盤を改良する固化材を供給する固化材供給管4aとを備えるものである。なお、切替弁11aは低減剤を吐出しない場合、切替ることで、圧縮空気のみを低減剤混合噴流供給配管3aに供給することができる。   Next, the solidification processing pile creation apparatus in the 2nd Embodiment of this invention is demonstrated with reference to FIGS. 5-7, the same code | symbol is attached | subjected to the same component as FIGS. 1-4, the description is abbreviate | omitted, and a different point is mainly demonstrated. That is, the solidified pile forming apparatus 10a of FIGS. 5 to 7 is different from the solidified pile forming apparatus 10 of FIGS. 1 to 4 in that the first compressed air supply pipe 3 is accompanied by a reducing agent with compressed air. The reducing agent mixing jet flow or the reducing agent mixing jet supply piping 3a for supplying compressed air is used, and the dual use piping 4 is the solidifying material supply piping 4a. That is, the solidification pile forming apparatus 10a is provided with a reducing agent that reduces the stirring resistance supplied from the reducing agent supply pipe 61 having the switching valve 11a while one end is connected to the ground supply means, and one end is supplied above the ground. A companion device 201 for entraining with compressed air introduced from a first compressed air supply pipe 81 connected to the means, and a solidified material supply pipe 4a for supplying a solidified material for improving the ground whose one end is connected to the ground supply means. Are provided. When the switching valve 11a does not discharge the reducing agent, the switching valve 11a can be switched to supply only the compressed air to the reducing agent mixed jet supply pipe 3a.

同伴装置201は、第1圧縮空気供給管81中に、低減剤供給管61の先端部を挿入し、部分的に二重配管にすると共に、低減剤供給管61の先端部の開口を吐出側に向けたものである。また、第1圧縮空気供給管81における二重配管より先の部分は、先細りとなっている。これにより、低減剤を圧縮空気に同伴させ噴流物として第1混合エジェクター5に供給することができる。   The companion device 201 inserts the tip of the reducing agent supply pipe 61 into the first compressed air supply pipe 81 to partially make a double pipe, and the opening of the tip of the reducing agent supply pipe 61 is on the discharge side. It is aimed at. Further, the portion of the first compressed air supply pipe 81 that is beyond the double pipe is tapered. Thereby, a reducing agent can be accompanied with compressed air and can be supplied to the 1st mixing ejector 5 as a jet.

また、図7の制御部20aは、図2の制御部20と同様であるものの、圧縮空気供給手段、低減剤供給手段及び固化材供給手段にそれぞれ接続される配管及び切替弁の位置が前述の通り異なるものである。   7 is the same as the control unit 20 in FIG. 2, but the positions of the piping and the switching valve connected to the compressed air supply means, the reducing agent supply means, and the solidifying material supply means are the same as those described above. The streets are different.

次に、固化処理杭造成装置10aを用いた固化処理杭造成方法を、固化処理杭造成装置10を用いた固化処理杭造成方法と異なる点について主に説明する。貫入工程において、回転軸1を正回転方向に回転させて、地盤中に貫入していくと、地盤と撹拌翼の抵抗から負荷電流が発生する。回転駆動手段の負荷電流が所定の上限値を超える場合、制御手段20aから低減剤及び圧縮空気の吐出信号が発せられ、同伴装置201から低減剤混合噴流が配管3aに供給され、第1混合エジェクター5から低減剤を圧縮空気と共に吐出することになる。これにより、低減剤吐出効果は、固化処理杭造成装置10を用いた固化処理杭造成方法と同様である。   Next, the difference between the solidification pile creation method using the solidification pile creation apparatus 10a and the solidification pile creation method using the solidification pile creation apparatus 10 will be mainly described. In the penetration step, when the rotary shaft 1 is rotated in the forward rotation direction and penetrates into the ground, a load current is generated from the resistance of the ground and the stirring blades. When the load current of the rotational drive means exceeds a predetermined upper limit value, a discharge signal of the reducing agent and compressed air is issued from the control means 20a, the reducing agent mixed jet is supplied from the companion device 201 to the pipe 3a, and the first mixing ejector 5, the reducing agent is discharged together with the compressed air. Thereby, the reducing agent discharge effect is the same as that of the solidification pile creation method using the solidification pile creation apparatus 10.

低減剤吐出過程において、負荷電流が下限値を下回った場合、制御手段20aから低減剤吐出停止信号が発せられ、第1混合エジェクター5からの低減剤と圧縮空気又は低減剤の吐出を停止する。低減剤の吐出を停止し、配管3aから圧縮空気のみを供給する場合には、切替弁11aを切り替えればよい。低減剤の吐出を停止した後、負荷電流が上昇し、再び所定の上限値を超える場合、第1混合エジェクター5から低減剤を圧縮空気と共に吐出する。   When the load current falls below the lower limit value in the reducing agent discharge process, a reducing agent discharge stop signal is issued from the control means 20a, and the discharge of the reducing agent and compressed air or reducing agent from the first mixing ejector 5 is stopped. When the discharge of the reducing agent is stopped and only compressed air is supplied from the pipe 3a, the switching valve 11a may be switched. After the discharge of the reducing agent is stopped, when the load current increases and exceeds the predetermined upper limit again, the reducing agent is discharged from the first mixing ejector 5 together with the compressed air.

引き抜き工程は、固化材供給手段及び第1圧縮空気供給手段を稼働させ、第1混合エジェクター5から固化材が圧縮空気と共に、吐出される。引き抜き工程において、回転駆動手段の負荷電流が所定の上限値を超える場合、制御手段20aから低減剤吐出信号が発せられ、切替弁11aが切替えられ、低減剤が供給され、第1混合エジェクター5から低減剤と固化材が圧縮空気と共に吐出される。引き抜き工程であって、且つ低減剤吐出過程において、負荷電流が下限値を下回った場合、制御手段20aから低減剤吐出停止信号が発せられ、切替弁11aが切替えられ、第1混合エジェクター5からの低減剤の吐出を停止する。   In the drawing step, the solidified material supply means and the first compressed air supply means are operated, and the solidified material is discharged together with the compressed air from the first mixing ejector 5. In the drawing process, when the load current of the rotation driving unit exceeds a predetermined upper limit value, a reducing agent discharge signal is issued from the control unit 20a, the switching valve 11a is switched, a reducing agent is supplied, and the first mixing ejector 5 The reducing agent and the solidifying material are discharged together with the compressed air. When the load current is lower than the lower limit value in the drawing process and the reducing agent discharge process, a reducing agent discharge stop signal is issued from the control means 20a, the switching valve 11a is switched, and the first mixing ejector 5 Stop the discharge of the reducing agent.

次に、本発明の第3の実施の形態における固化処理杭造成装置を図8及び図9を参照して説明する。図8の固化処理杭造成装置10bにおいて、図1の固化処理杭造成装置10と異なる点は、回転軸1の中空部に配設され、一端が地上の固化材供給手段9に接続される固化材供給管14及び一端が地上の圧縮空気供給手段8bに接続される第2圧縮空気供給管13と、固化材供給管14から導入される固化材を、第2圧縮空気供給管13から導入される圧縮空気に同伴させる、撹拌翼2内に付設される第2混合エジェクター15を更に、有するところにある。   Next, the solidification pile creation apparatus in the 3rd Embodiment of this invention is demonstrated with reference to FIG.8 and FIG.9. 8 differs from the solidified pile forming apparatus 10 in FIG. 1 in that the solidified pile is arranged in the hollow portion of the rotary shaft 1 and one end is connected to the solidified material supply means 9 on the ground. The material supply pipe 14 and the second compressed air supply pipe 13 whose one end is connected to the ground compressed air supply means 8 b and the solidified material introduced from the solidified material supply pipe 14 are introduced from the second compressed air supply pipe 13. The second mixing ejector 15 attached in the stirring blade 2 is also provided to be accompanied by the compressed air.

固化処理杭造成装置10bにおいて、第2混合エジェクター15は、撹拌翼2内であって、撹拌翼2のほぼ中央部に位置し、吐出口51を下向きに設置した以外は、第1混合エジェクター5と同様の構成を採る。また、第1混合エジェクター5が低減剤又は固化材のいずれか又は両方を吐出するのに対して、第2混合エジェクター15はセメントミルク(固化材)のみを吐出する点で両混合エジェクターは役割が異なる。なお、図5中、第2混合エジェクター15は吐出口51を下側向きに設置されているが、これに限定されず、扁平開口を横置きとし、その吐出口を回転軸の回転方向とすることもできる。   In the solidification processing pile forming apparatus 10b, the second mixing ejector 15 is in the stirring blade 2 and is located in the substantially central portion of the stirring blade 2, and the first mixing ejector 5 is disposed with the discharge port 51 facing downward. The same configuration is adopted. The first mixing ejector 5 discharges either or both of the reducing agent and the solidifying material, whereas the second mixing ejector 15 plays a role in discharging only cement milk (solidifying material). Different. In FIG. 5, the second mixing ejector 15 is provided with the discharge port 51 facing downward. However, the present invention is not limited to this, and the flat opening is set horizontally and the discharge port is set as the rotation direction of the rotation shaft. You can also.

固化処理杭造成装置10bの制御部20bにおいて、固化処理杭造成装置10の制御部20と異なる点は、図2の制御部20に、更に図6の第2圧縮空気演算処理部27及び第2固化材演算処理部28を付加した点にある。すなわち、演算部22は所定の上限値又は下限値との演算結果を送信する機能の他に、第2圧縮空気演算処理部27を通じて第2圧縮空気供給手段8bに圧縮空気吐出信号を送信し、第2固化材演算処理部28を通じて第2固化材供給手段9の固化材吐出信号を送信する。   The control unit 20b of the solidified pile forming apparatus 10b is different from the control unit 20 of the solidified pile forming apparatus 10 in that the control unit 20 in FIG. 2 further includes the second compressed air calculation processing unit 27 and the second in FIG. The solidifying material calculation processing unit 28 is added. That is, the calculating part 22 transmits a compressed air discharge signal to the 2nd compressed air supply means 8b through the 2nd compressed air calculating process part 27 other than the function which transmits the calculation result with a predetermined | prescribed upper limit value or a lower limit, The solidified material discharge signal of the second solidified material supply means 9 is transmitted through the second solidified material calculation processing unit 28.

次に、固化処理杭造成装置10bを用いた固化処理杭造成方法を説明する。貫入工程は、固化材を吐出せず、回転軸1を正回転させ原位置土を撹拌する工程である点で、固化処理杭造成装置10を用いた貫入工程と同じであり、その説明を省略する。なお、第2混合エジェクター15は、停止状態であるが、吐出口から圧縮空気を吐出しておくことが、吐出口を詰まらせることがない点で好ましい。   Next, the solidification pile creation method using the solidification pile creation apparatus 10b will be described. The penetration process is the same as the penetration process using the solidification pile forming apparatus 10 in that the solidification material is not discharged and the rotating shaft 1 is rotated forward to agitate the original soil, and the description thereof is omitted. To do. In addition, although the 2nd mixing ejector 15 is a stop state, it is preferable at the point which does not clog a discharge port to discharge compressed air from a discharge port.

引き抜き工程は、第2混合エジェクター15及び必要に応じて第1混合エジェクター5から固化材(セメントミルク)が圧縮空気と共に、吐出される。これにより、固化処理杭9が造成される。第1混合エジェクター5と第2混合エジェクター15を併用すれば、単独使用と同じ引き抜き速度であれば、単位体積当たりの固化材の注入量を多くでき、単独使用と同じ固化材の注入量であれば、引き抜き速度を格段に向上させることができる。   In the drawing process, the solidified material (cement milk) is discharged together with the compressed air from the second mixing ejector 15 and, if necessary, the first mixing ejector 5. Thereby, the solidification processing pile 9 is created. If the first mixed ejector 5 and the second mixed ejector 15 are used in combination, the amount of solidified material injected per unit volume can be increased if the extraction speed is the same as that for single use. In this case, the drawing speed can be greatly improved.

引き抜き工程において、第1混合エジェクター5から固化材が吐出される場合、回転駆動手段の負荷電流が所定の上限値を超える場合、制御手段20bから低減剤吐出信号が発せられ、第1混合エジェクター5から低減剤が固化材及び圧縮空気と共に吐出される。この低減剤の吐出動作及び吐出停止動作については、固化処理杭造成装置10を用いた引き抜き工程と同じであり、その説明を省略する。   In the drawing process, when the solidified material is discharged from the first mixing ejector 5, when the load current of the rotation driving unit exceeds a predetermined upper limit value, a reducing agent discharge signal is issued from the control unit 20b, and the first mixing ejector 5 is discharged. The reducing agent is discharged together with the solidifying material and compressed air. About the discharge operation and discharge stop operation | movement of this reducing agent, it is the same as the drawing-out process using the solidification process pile construction apparatus 10, The description is abbreviate | omitted.

引き抜き工程において、第1混合エジェクター5から固化材が吐出されていない場合、回転駆動手段の負荷電流が所定の上限値を超える場合、制御手段20bから低減剤吐出信号が発せられ、第1混合エジェクター5から低減剤が圧縮空気と共に吐出される。引き抜き工程における低減剤の吐出動作及び吐出停止動作については、固化処理杭造成装置10を用いた貫入工程と同じであり、その説明を省略する。引き抜き工程において、第1混合エジェクター5から固化材が吐出されていない場合であっても、第2混合エジェクター15から固化材が吐出しているため、所望の固化処理杭9は造成される。   In the drawing process, when the solidified material is not discharged from the first mixing ejector 5, when the load current of the rotation driving means exceeds a predetermined upper limit value, a reducing agent discharge signal is issued from the control means 20b, and the first mixing ejector From 5, the reducing agent is discharged together with the compressed air. About the discharge operation and discharge stop operation | movement of the reducing agent in a drawing-out process, it is the same as the penetration process using the solidification process pile construction apparatus 10, The description is abbreviate | omitted. Even if the solidified material is not discharged from the first mixed ejector 5 in the drawing step, the desired solidified pile 9 is formed because the solidified material is discharged from the second mixed ejector 15.

本発明に用いる低減剤は、粉砕した土や土粒子の粒子間に作用して流動性を高め、撹拌翼の掘削抵抗を低減するものであり、例えば、ポリカルボン酸又はポリアクリルアミドが挙げられ、共に水溶液として使用する。ポリアクリル酸ソーダの分子量は5,000〜1,000,000、好ましくは5,000〜50,000である。ポリカルボン酸は、粘性土の場合、掘削撹拌抵抗低減効果がより顕著に表れ、ポリアクリル酸ソーダは砂質土の場合掘削撹拌抵抗低減効果がより顕著に表れる。ポリカルボン酸の使用量は、固化材としてのセメント比で0.1〜10%、原地盤土1mに対して0.15〜15kgであり、好ましくはセメント比で0.1〜5%、原地盤土1mに対して0.15〜7.5kgである。ポリアクリルアミドは、砂礫質土の場合、掘削撹拌抵抗低減効果がより顕著に表れる。ポリアクリルアミドの使用量は、固化材としてのセメント比で0.1〜10%、原地盤土1mに対して0.15〜15kgであり、好ましくはセメント比で0.1〜1%、原地盤土1mに対して0.15〜1.5kgである。ポリカルボン酸又はポリアクリルアミドは、これを併用してもよい。 The reducing agent used in the present invention acts between the pulverized soil and soil particles to increase fluidity and reduce the excavation resistance of the stirring blade, and includes, for example, polycarboxylic acid or polyacrylamide, Both are used as aqueous solutions. The molecular weight of sodium polyacrylate is 5,000 to 1,000,000, preferably 5,000 to 50,000. In the case of polycarboxylic acid, the excavation agitation resistance reduction effect appears more remarkably in the case of viscous soil, and in the case of polyacrylic acid soda, the excavation agitation resistance reduction effect appears more remarkably. The amount of polycarboxylic acid used is 0.1 to 10% in terms of cement as a solidifying material, 0.15 to 15 kg with respect to 1 m 3 of the ground soil, and preferably 0.1 to 5% in terms of cement. It is 0.15-7.5 kg with respect to 1 m 3 of the ground soil. When polyacrylamide is a gravelly soil, the effect of reducing excavation stirring resistance appears more remarkably. The amount of polyacrylamide used is 0.1 to 10% in terms of cement as a solidifying material and 0.15 to 15 kg with respect to 1 m 3 of the ground soil, preferably 0.1 to 1% in terms of cement. is a 0.15~1.5kg to the ground soil 1m 3. Polycarboxylic acid or polyacrylamide may be used in combination.

本発明によれば、地盤を掘削する負荷電流を監視し、低減剤の吐出と吐出停止を繰り返し行なうことで、固化処理杭造成装置の全負荷電流内での貫入及び引き抜きを可能とする。このため、大型の造成装置を必要とせず、回転軸を容易に所定深度まで貫入することができる。また、低減剤の無駄な使用を減らすことができる。   According to the present invention, the load current for excavating the ground is monitored, and the discharge and stoppage of the reducing agent are repeatedly performed, thereby enabling the solidification pile forming device to penetrate and withdraw within the full load current. For this reason, a rotating shaft can be easily penetrated to the predetermined depth, without requiring a large generating device. Moreover, useless use of the reducing agent can be reduced.

1 回転軸
2 撹拌翼
3 第1圧縮空気供給管
4 兼用供給管
5 第1混合エジェクター
6 撹拌抵抗低減剤供給手段
7 固化材供給手段
8a 第1圧縮空気供給手段
8b 第2圧縮空気供給手段
9 固化材供給手段
10、10a、10b 固化処理杭造成装置
11、11a 切替弁
12 スイベル管
13 第2圧縮空気供給管
14 固化材供給管
15 第2混合エジェクター
20、20a、20b 制御手段
21 負荷電流センサー
22 演算部
23 低減剤制御部
24 圧縮空気演算処理部
25 低減剤演算処理部
26 固化材演算処理部
27 第2圧縮空気演算処理部
28 第2固化材演算処理部
DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Stirring blade 3 First compressed air supply pipe 4 Combined supply pipe 5 First mixing ejector 6 Stirring resistance reducing agent supply means 7 Solidified material supply means 8a First compressed air supply means 8b Second compressed air supply means 9 Solidification Material supply means 10, 10 a, 10 b Solidification pile forming device 11, 11 a Switching valve 12 Swivel pipe 13 Second compressed air supply pipe 14 Solidified material supply pipe 15 Second mixing ejector 20, 20 a, 20 b Control means 21 Load current sensor 22 Calculation unit 23 Reducing agent control unit 24 Compressed air calculation processing unit 25 Reducing agent calculation processing unit 26 Solidified material calculation processing unit 27 Second compressed air calculation processing unit 28 Second solidification material calculation processing unit

Claims (5)

回転駆動手段により回転される中空の回転軸と、
該回転軸の下方に放射状に設けた1以上の撹拌翼と、
一端が地上の供給手段に接続される途中に切替弁を有する低減剤供給管から供給される撹拌抵抗を低減する低減剤を、一端が地上の供給手段に接続される第1圧縮空気供給管から導入される圧縮空気に同伴させる同伴装置と、
該回転軸の中空部に配設され、一端が地上の供給手段に接続される地盤を改良する固化材を供給する固化材供給管と、
該同伴装置で得られる低減剤混合噴流を吐出する又は該固化材供給管から導入される固化材を該圧縮空気に同伴させて吐出する該撹拌翼内に付設される第1混合エジェクターと、
該回転駆動手段の負荷電流が所定の上限値を超える際、低減剤を吐出し、所定の下限値を下回る際、低減剤の吐出を停止する制御手段と、
を備え、該切替弁は、低減剤の供給と低減剤の供給停止を切り替えるものであることを特徴とする固化処理杭造成装置。
A hollow rotating shaft rotated by a rotation driving means;
One or more stirring blades provided radially below the rotating shaft;
From the first compressed air supply pipe whose one end is connected to the ground supply means, the reducing agent that reduces the stirring resistance supplied from the reducing agent supply pipe having the switching valve while one end is connected to the ground supply means. A companion device to accompany the compressed air introduced;
A solidifying material supply pipe that supplies a solidifying material that is disposed in a hollow portion of the rotating shaft and has one end connected to ground supply means, and that improves the ground;
A first mixing ejector attached in the stirring blade for discharging the reducing agent mixed jet obtained by the accompanying device or discharging the solidifying material introduced from the solidifying material supply pipe together with the compressed air;
Control means for discharging the reducing agent when the load current of the rotation driving means exceeds a predetermined upper limit value, and stopping the discharge of the reducing agent when the load current falls below a predetermined lower limit value;
The provided, said switching valve, solidification Pile Construction apparatus according to claim der Rukoto switches the supply stop and supply-reducing agent reducing agents.
該第1混合エジェクターは、該撹拌翼の中央近傍に位置し、且つ吐出口を撹拌翼の正回転方向前方に向けて付設したことを特徴とする請求項1記載の固化処理杭造成装置。 First mixing ejector, said agitation located near the center of the blade, and claim 1 Symbol placement of solidification pile reclamation apparatus discharge port, characterized in that annexed toward the normal rotation direction ahead of the stirring blade. 該回転軸の中空部に配設され、一端が地上の供給手段に接続される固化材供給管及び一端が地上の供給手段に接続される第2圧縮空気供給管と、
該固化材供給管から導入される固化材を、該第2圧縮空気供給管から導入される圧縮空気に同伴させて吐出する該撹拌翼内に付設される第2混合エジェクターを更に、有することを特徴とする請求項1又は2に記載の固化処理杭造成装置。
A solidified material supply pipe disposed at a hollow portion of the rotating shaft, one end of which is connected to the ground supply means, and a second compressed air supply pipe whose one end is connected to the ground supply means;
A second mixing ejector attached to the stirring blade for discharging the solidified material introduced from the solidified material supply pipe together with the compressed air introduced from the second compressed air supply pipe; The solidification pile construction device according to claim 1 or 2 characterized by things.
請求項1又は2に記載の固化処理杭造成装置を用い、貫入工程は、該回転軸を回転させ原位置土を撹拌し、引き抜き工程は、該第1混合エジェクターから固化材を圧縮空気と共に吐出させ、原位置土と撹拌混合して地中に固化処理杭を造成する方法であって、
該制御手段を作動させ、貫入工程は、該回転駆動手段の負荷電流が所定の上限値を超える場合、低減剤を吐出し、該負荷電流が所定の下限値を下回った場合、低減剤の吐出を停止し、引き抜き工程は、該回転駆動手段の負荷電流が所定の上限値を超える場合、低減剤を固化材と共に吐出し、該負荷電流が所定の下限値を下回った場合、低減剤の吐出を停止することを特徴とする固化処理杭の造成方法。
3. The solidification pile forming apparatus according to claim 1 or 2 , wherein the penetration step rotates the rotating shaft to stir the original soil, and the drawing step discharges the solidified material together with compressed air from the first mixed ejector. And agitation and mixing with in-situ soil to create a solidified pile in the ground,
The control means is activated, and the penetration step discharges the reducing agent when the load current of the rotation driving means exceeds a predetermined upper limit value, and discharges the reducing agent when the load current falls below the predetermined lower limit value. In the drawing process, when the load current of the rotation driving unit exceeds a predetermined upper limit value, the reducing agent is discharged together with the solidifying material, and when the load current is lower than the predetermined lower limit value, the reducing agent is discharged. A method for constructing a solidified pile, characterized by stopping the operation.
請求項記載の固化処理杭造成装置を用い、貫入工程は、該回転軸を回転させ原位置土を撹拌し、引き抜き工程は、該第1混合エジェクター又は第2混合エジェクターから固化材を圧縮空気と共に吐出させ、原位置土と撹拌混合して地中に固化処理杭を造成する方法であって、該制御手段を作動させ、貫入工程は、該回転駆動手段の負荷電流が所定の上限値を超える場合、低減剤を吐出し、該負荷電流が所定の下限値を下回った場合、低減剤の吐出を停止し、引き抜き工程は、該回転駆動手段の負荷電流が所定の上限値を超える場合、該第1混合エジェクターから低減剤を固化材と共に吐出し、該負荷電流が所定の下限値を下回った場合、低減剤の吐出を停止することを特徴とする固化処理杭の造成方法。 The solidification pile construction apparatus according to claim 3 , wherein the penetration step rotates the rotating shaft to stir the in-situ soil, and the drawing step removes the solidified material from the first mixed ejector or the second mixed ejector with compressed air. A solidified pile in the ground by stirring and mixing with the in-situ soil, the control means is operated, and the intrusion step has a load current of the rotary drive means having a predetermined upper limit value. If it exceeds, discharge the reducing agent, if the load current falls below a predetermined lower limit value, stop the discharge of the reducing agent, the extraction step, if the load current of the rotational drive means exceeds a predetermined upper limit value, A method for producing a solidified pile, wherein the reducing agent is discharged from the first mixed ejector together with the solidifying material, and the discharging of the reducing agent is stopped when the load current falls below a predetermined lower limit value.
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