JP2005220594A - Pile construction method and equipment therefor - Google Patents

Pile construction method and equipment therefor Download PDF

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JP2005220594A
JP2005220594A JP2004028869A JP2004028869A JP2005220594A JP 2005220594 A JP2005220594 A JP 2005220594A JP 2004028869 A JP2004028869 A JP 2004028869A JP 2004028869 A JP2004028869 A JP 2004028869A JP 2005220594 A JP2005220594 A JP 2005220594A
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pile
auger screw
excavation
excavation head
underground hole
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Kazuo Komazawa
和男 駒澤
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NIPPON BEESU KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile construction method and equipment therefor which enable a pile to be efficiently constructed while excavated soil is discharged, and which enhance a load bearing capacity by the possession of a pile base. <P>SOLUTION: An auger screw 4 is inserted into a hollow pile 7 whose lower end is provided with a flange 8; a detachable excavating head 9 is coupled to the lower end of a rod 12 by means of an engaging protrusion 17 and a protrusion 16; and the hollow pile 7 which is held in a sandwiched state by a chucking member 6 is pressed into the ground so that an interval between the flange 8 and the excavating head 9 can be kept constant. The excavated soil can be discharged to the outside from the upper end of the hollow pile 7 by ascending in the hollow pile 7. The excavating head 9 can be left behind on the inner bottom of an underground hole, and integrated with the flange 8 so as to constitute a reinforcing member for forming a pile base at the lower end of the hollow pile 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、杭施工方法及びその装置に関し、とりわけ、下端部にフランジ部を設けた軸方向中空の杭を地中に埋設する方法とその装置に関する。   The present invention relates to a pile construction method and apparatus, and more particularly, to a method and apparatus for embedding an axial hollow pile having a flange portion at a lower end portion in the ground.

特に沖積平野部における沖積層に杭を建て込む場合に、先端に螺旋状の羽根を溶接した鋼管杭を、オーガーマシン等で回転させ、先端の羽根によって地盤を掘削することにより鋼管杭を地中に貫入させる無排土施工法が知られている。   Especially when piles are built in alluvial layers in alluvial plains, steel pipe piles with helical blades welded to the tip are rotated with an auger machine etc. There is a known soil-free construction method that penetrates the soil.

前記羽根の形状の一つには、鋼管杭の直径よりも大なる環状板体の一部を半径方向へ切欠き、かつ、その両端部を互いに反する方向へ曲げて螺旋状にしたもので、その両端面にはそれぞれ掘削刃として作用すべき傾斜刃部が形成されている。また、他の一つには、円盤を中心で二分した半円状板体を、互いに交差した状態で鋼管杭の先端に溶接してある。半円状体の直線部には掘削刃として作用すべき傾斜刃部が形成されている。   In one of the shapes of the blades, a part of the annular plate body larger than the diameter of the steel pipe pile is cut out in the radial direction, and both ends thereof are bent in directions opposite to each other and spiraled, On both end faces, inclined blade portions that should act as excavation blades are formed. In the other, a semicircular plate body divided into two at the center of the disk is welded to the tip of the steel pipe pile in a state of crossing each other. An inclined blade portion that should act as a drilling blade is formed in the straight portion of the semicircular body.

上記従来の杭施工技術においては、いずれも沖積層に特有の、社会問題化する産業廃棄物の残土等の存在を前提として、環境対策のために無排土施工を達成することを目的としている。   The above-mentioned conventional pile construction technologies are all aimed at achieving soil-free construction for environmental measures on the premise of the existence of residual soil of industrial waste that becomes a social problem, which is peculiar to alluvium. .

しかしながら、鋼管杭先端の羽根が前記のような構造であるとともに、オーガスクリュウを用いないために、掘削土を地上に排出する機能がなく、掘削土は地中に残されるから、鋼管杭を建て込む効率がはかばかしくないという問題がある。また、掘削土が地中に残される無排土工法の故に、鋼管杭の拡径根部を形成施工することができないから、支持力の増大を図ることができない欠点がある。   However, the blade at the tip of the steel pipe pile has the structure as described above, and since no auger screw is used, there is no function of discharging the excavated soil to the ground, and the excavated soil is left in the ground. There is a problem that the efficiency of loading is not ridiculous. In addition, because of the non-exhaust earth method in which excavated soil remains in the ground, it is not possible to form and construct a diameter-expanded root portion of the steel pipe pile.

そこで、この発明は、掘削土を排土しながら効率高く杭施工が可能で、かつ、拡径根部を有して支持力が高い杭施工方法とその装置を提供する。   Therefore, the present invention provides a pile construction method and apparatus capable of carrying out pile construction with high efficiency while discharging excavated soil and having a large-diameter root and high supporting force.

本発明は、請求項1に記載したように、ベースマシンのタワーに昇降可能に支持したオーガ駆動機にオーガスクリュウを回転自在に吊支し、このオーガスクリュウには下端にフランジ部を設けた軸方向中空の杭を挿通し、この杭の上端部側をチャッキング部材を介して地中へ押し込むための圧入機を前記タワーに昇降可能に支持し、前記オーガスクリュウの下端部には掘削爪部を有する円盤状の掘削ヘッドを着脱可能に係合し、この掘削ヘッドの正回転により掘削した地中孔内に前記杭を圧入し、この掘削ヘッドと前記杭のフランジ部との間隔を適宜開いた状態で掘削を進行することにより、掘削土砂を前記杭内へ導入して前記オーガスクリュウにて中空部を上昇させて外部へ排出しながら地中孔を掘削するともに、杭を地中孔へ押し込む作業を継続して前記杭を地中孔内に埋設した後、前記オーガスクリュウを逆回転させて前記掘削ヘッドとの係合を解除し、かつ、オーガスクリュウを前記杭から引き抜いた後、前記掘削ヘッドとフランジ部上の前記地中孔内底にモルタル又は生コンクリート等を注入して前記杭の直径よりも大きい直径の根部を形成することを特徴とする杭施工方法としたものである。   According to the present invention, an auger screw is rotatably supported on an auger drive supported so as to be movable up and down on a tower of a base machine, and the auger screw is provided with a shaft having a flange at the lower end. A hollow that is hollow in the direction is inserted, and a press-fitting machine for pushing the upper end side of the pile into the ground via a chucking member is supported so as to be able to move up and down on the tower. A disk-shaped excavation head having a detachable engagement, press-fitting the pile into an underground hole excavated by the forward rotation of the excavation head, and opening the gap between the excavation head and the flange portion as appropriate. By excavating in a state where the excavation has progressed, the excavated earth and sand are introduced into the pile and the auger screw lifts the hollow portion and discharges it to the outside while excavating the underground hole, and the pile into the underground hole. Work to push The pile is buried in the underground hole, the auger screw is reversely rotated to disengage from the excavation head, and the auger screw is pulled out of the pile, and then the excavation head In addition, a mortar or ready-mixed concrete is injected into the bottom of the underground hole on the flange portion to form a root portion having a diameter larger than the diameter of the pile.

また、請求項2に記載したように、ベースマシンのタワーに昇降可能に支持したオーガ駆動機にオーガスクリュウを回転自在に吊支し、このオーガスクリュウには下端にフランジ部を設けた軸方向中空の杭を挿通し、この杭の上端部側をチャッキング部材を介して地中へ押し込むための圧入機を前記タワーに昇降可能に支持し、前記オーガスクリュウの下端部には掘削爪部を有する円盤状の掘削ヘッドを着脱可能に係合し、この掘削ヘッドの正回転により掘削した地中孔内に前記杭を圧入し、この掘削ヘッドと前記杭のフランジ部との間隔を適宜開いた状態でオーガスクリュウの下端側からエアーを噴出させながら掘削を進行することにより、掘削土砂を前記杭内へ導入して前記オーガスクリュウにて中空部を上昇させて外部へ排出しながら地中孔を掘削するとともに、杭を地中孔へ押し込む作業を継続して前記杭を地中孔に埋設した後、前記オーガスクリュウを逆回転させて前記掘削ヘッドとの係合を解除し、かつ、オーガスクリュウを前記杭から引き抜いた後、セメントミルク等を地中孔内底に注入して前記掘削ヘッドとフランジ部とを結合し、かつ、前記掘削ヘッドとフランジ部上の前記地中孔内にモルタル又は生コンクリートを注入して前記杭の直径よりも大きい直径の根部を形成することを特徴とする杭施工方法としたものである。   According to a second aspect of the present invention, an auger screw is rotatably supported on an auger driving machine supported by a tower of a base machine so as to be movable up and down, and the auger screw is provided with a flange portion at a lower end thereof. A press-fitting machine for pushing the upper end side of this pile into the ground via a chucking member is supported so as to be able to be raised and lowered, and a lower end portion of the auger screw has an excavation claw portion. A state in which a disc-shaped excavation head is detachably engaged, the pile is press-fitted into an underground hole excavated by the forward rotation of the excavation head, and a space between the excavation head and the flange portion of the pile is appropriately opened The excavating soil is introduced into the pile and the hollow portion is raised by the auger screw and discharged to the outside by advancing excavation while blowing air from the lower end side of the auger screw. Excavating the borehole and continuing to push the pile into the borehole and burying the pile in the borehole, then reversely rotating the auger screw to disengage the drilling head; and After the auger screw is pulled out from the pile, cement milk or the like is injected into the bottom of the underground hole to connect the excavation head and the flange portion, and in the underground hole on the excavation head and the flange portion. The pile construction method is characterized in that a mortar or ready-mixed concrete is poured into the base to form a root having a diameter larger than the diameter of the pile.

また、請求項4に記載したように、ベースマシンのタワーに昇降可能に支持したオーガ駆動機に回転自在に吊支されたオーガスクリュウと、このオーガスクリュウが挿通する下端にフランジ部を設けた軸方向中空の杭と、この杭の上端部側をチャッキング部材を介して地中へ押し込むため前記タワーに昇降可能に支持した杭圧入機と、前記オーガスクリュウのロッド下端に着脱可能に係合して掘削爪部を有する円盤状の掘削ヘッドとからなることを特徴とする杭施工装置としたものである。   Further, as described in claim 4, an auger screw that is rotatably supported by an auger drive supported so as to be movable up and down on a tower of a base machine, and a shaft provided with a flange at a lower end through which the auger screw is inserted. A directional hollow pile, a pile presser that is supported so as to be able to move up and down on the tower in order to push the upper end side of this pile into the ground via a chucking member, and a rod lower end of the auger screw are detachably engaged. The pile construction apparatus is characterized by comprising a disc-shaped excavation head having an excavation claw portion.

本発明によれば、杭に挿通したオーガスクリュウのロッド下端に掘削ヘッドを着脱可能に係合してオーガ駆動機で回転駆動することにより、掘削土が杭内を上昇して杭外部へ排出されるので、杭を地中に圧入する効率が高くなり、杭を回転させて圧入する前記無排土工法よりも杭建て込み効率が一段と向上する。   According to the present invention, the excavating head is detachably engaged with the lower end of the auger screw rod inserted into the pile and is rotated by the auger drive machine, so that the excavated soil rises in the pile and is discharged to the outside of the pile. Therefore, the efficiency of press-fitting a pile into the ground is increased, and the efficiency of building a pile is further improved as compared with the above-described soil-free soil construction method in which the pile is rotated and press-fitted.

また、掘削ヘッドは杭径の2倍以上に設定することにより杭を地中に圧入する速度及び効率が上昇し、また、杭の下端部に形成したフランジ部と共に地中孔内底に残置され、好ましくは両者一体に結合されて杭の直径よりも大なる直径の杭根部を形成できるから、杭の支持力を前記無排土工法に比べれば著しく向上させる。   In addition, the excavation head is set to be twice or more the pile diameter to increase the speed and efficiency of press-fitting the pile into the ground, and is left in the bottom of the underground hole with the flange formed at the lower end of the pile. In addition, since the pile root portion having a diameter larger than that of the pile can be formed preferably by being integrally coupled to each other, the supporting force of the pile is remarkably improved as compared with the non-exhaust earth method.

さらに、杭自体には掘削ヘッドが取り付けられておらず、掘削作業をするのではないから、杭を回転駆動する必要性がないので、駆動力が大なるオーガ駆動機は必要がない。オーガ駆動機は掘削ヘッドをロッド下端に着脱可能に取りつけたオーガスクリュウを掘削回転させるのに十分な、駆動力が小なる従来の常用物で足りる。   Furthermore, since the excavation head is not attached to the pile itself and excavation work is not performed, there is no need to rotationally drive the pile, and therefore an auger driving machine with a large driving force is not necessary. The auger drive machine may be a conventional one with a small driving force sufficient for excavating and rotating an auger screw having a drilling head detachably attached to the lower end of the rod.

しかも、杭施工装置は掘削ヘッドを有するオーガスクリュウを用いた従来の杭施工装置に圧入装置を付加するだけの経済性を有する。   In addition, the pile construction device is economical enough to add a press-fitting device to a conventional pile construction device using an auger screw having an excavation head.

その上、杭を回転させて圧入する前記無排土工法が有する効果、すなわち、低騒音・低振動、大支持力、高耐震性,大引き抜き支持力、短工期並びに低コスト等の効果を併せ持つ、という効果が得られる。   In addition, it has the effects of the above-mentioned soil-free method of rotating and press-fitting piles, that is, low noise / low vibration, large bearing capacity, high earthquake resistance, large pulling bearing capacity, short construction period and low cost. The effect of is obtained.

本発明は、ベースマシンのタワーに昇降可能に支持したオーガ駆動機に回転自在に吊支されたオーガスクリュウと、このオーガスクリュウが挿通する下端にフランジ部を設けた軸方向中空の杭と、この杭の上端部側をチャッキング部材を介して地中へ押し込むため前記タワーに昇降可能に支持した杭圧入機と、前記オーガスクリュウのロッド下端に着脱可能に係合して掘削爪部を有する円盤状の掘削ヘッドとを備えた杭施工装置と、この杭施工装置を用いた杭施工方法とによって構成される。   The present invention includes an auger screw that is rotatably supported by an auger drive supported so as to be movable up and down on a tower of a base machine, an axial hollow pile provided with a flange portion at a lower end through which the auger screw is inserted, A pile presser that is movably supported by the tower so as to push the upper end side of the pile into the ground via a chucking member, and a disk having a digging claw portion that is detachably engaged with the lower end of the rod of the auger screw. The pile construction apparatus provided with the shape-shaped excavation head and the pile construction method using this pile construction apparatus are comprised.

図1は、本発明方法の一実施例を示す工程図である。図1(A)は杭施工装置の全体を示すもので、杭を建て込む地盤E上を走行可能なベースマシン1にタワー2が垂直に立設しており、そのタワー2に昇降可能に支持されるオーガ駆動機3には、オーガスクリュウ4が回転自在に吊支され、また、タワー2に昇降可能に支持される圧入機5にはチャッキング部材6を介して鋼管等の中空杭7が押し下げ可能に吊支され、この中空杭7内に前記オーガスクリュウ4が挿入されている。中空杭7の先端すなわち下端部にはフランジ部8が溶接にて固定されている。オーガスクリュウ4の先端すなわち下端部には掘削ヘッド9が着脱可能に連結されている。   FIG. 1 is a process chart showing an embodiment of the method of the present invention. Fig. 1 (A) shows the entire pile construction device. A tower 2 is vertically installed on a base machine 1 that can run on the ground E on which the pile is built, and is supported by the tower 2 so that it can be raised and lowered. An auger screw 4 is rotatably supported on the auger drive machine 3, and a hollow pile 7 such as a steel pipe is provided on a press-fitting machine 5 supported by the tower 2 so as to be movable up and down. The auger screw 4 is inserted into the hollow pile 7 so as to be able to be pushed down. A flange portion 8 is fixed to the front end, that is, the lower end portion of the hollow pile 7 by welding. An excavation head 9 is detachably connected to the tip, that is, the lower end of the auger screw 4.

図2に示すように、チャッキング部材6は中空杭7を挟持してチャックし、このチャッキング部材6の直径方向で相対向する部分に一対のラム10,10が垂直に連結され、これらのラム10,10にはシリンダー11,11が装着され、シリンダー11,11は油圧装置等を有する圧入機5に固定されている。また、中空杭7の下端部に連結されたフランジ部8は環状板体である。   As shown in FIG. 2, the chucking member 6 chucks the hollow pile 7, and a pair of rams 10, 10 are vertically connected to the diametrically opposed portions of the chucking member 6. Cylinders 11 and 11 are mounted on the rams 10 and 10, and the cylinders 11 and 11 are fixed to a press-fitting machine 5 having a hydraulic device or the like. Moreover, the flange part 8 connected with the lower end part of the hollow pile 7 is an annular plate.

オーガスクリュウ4は回転中心となるロッド12に螺旋羽根を巻き付けた構造であり、その螺旋羽根は下端部側で一定の長さにおいて、中空杭7のほぼ内径に接する程度の幅寸法を備えた大径の螺旋羽根13aであるのに反し、その上部側ではそれよりも小さくて内径から離れる程度の幅寸法を備えた小径の螺旋羽根13bとして掘削土の上昇排出効率が向上するようになされている。   The auger screw 4 has a structure in which a spiral blade is wound around a rod 12 serving as a center of rotation, and the spiral blade has a large width dimension that is in contact with the inner diameter of the hollow pile 7 at a constant length on the lower end side. Contrary to the spiral blade 13a having a diameter, on the upper side thereof, ascending and discharging efficiency of the excavated soil is improved as a small-diameter spiral blade 13b having a width smaller than that and separated from the inner diameter. .

さらに、ロッド12の下端部にはそれを差し込む筒状のジョイントブロック14がロッド12と一体に連結される。このジョイントブロック14は図3に示すように、ロッド12を差し込む筒部14aと一体のブロック14bの直径対向部に、一対でI形の突起部16,16を形成したものである。したがって、突起部16はロッド12の外周面から水平方向へ突出していることになる。なお、詳細な図示は省略するが、ロッド12の上端部にはエアー噴出装置を接続すると共に、ロッド12の下端部側には筒部14aのエアー噴出口15に通じる孔を設けてある。   Further, a cylindrical joint block 14 into which the rod 12 is inserted is integrally connected to the rod 12 at the lower end of the rod 12. As shown in FIG. 3, the joint block 14 is formed by forming a pair of I-shaped protrusions 16 and 16 on the diameter-opposing portion of a block 14b integrated with a cylindrical portion 14a into which the rod 12 is inserted. Accordingly, the protrusion 16 protrudes from the outer peripheral surface of the rod 12 in the horizontal direction. Although not shown in detail, an air ejection device is connected to the upper end portion of the rod 12, and a hole communicating with the air ejection port 15 of the cylindrical portion 14a is provided on the lower end side of the rod 12.

この突起部16,16が掘削ヘッド9のL形の係合突起部17,17と係脱することにより、ロッド12と掘削ヘッド9の着脱ができる。すなわち、ロッド12を正回転(右回転)させると突起部16,16と係合突起部17,17が係合し、ロッド12を逆回転(左回転)させるとその係合が解かれるようにしてある。   The projections 16 and 16 are engaged with and disengaged from the L-shaped engagement projections 17 and 17 of the excavation head 9 so that the rod 12 and the excavation head 9 can be attached and detached. That is, when the rod 12 is rotated forward (rightward), the protrusions 16 and 16 and the engaging protrusions 17 and 17 are engaged, and when the rod 12 is rotated backward (leftward), the engagement is released. It is.

掘削ヘッド9は図3から図5に示すように、その直径寸法D(図5参照)が前記中空杭7の直径寸法d(図5参照)の少なくとも2倍以上である円盤体からなる。この円盤体の直径寸法Dはフランジ部8の直径寸法c(図5参照)と等しいか若しくはそれよりも大である。   As shown in FIGS. 3 to 5, the excavation head 9 is formed of a disk body having a diameter dimension D (see FIG. 5) that is at least twice the diameter dimension d (see FIG. 5) of the hollow pile 7. The diameter D of the disc body is equal to or larger than the diameter c of the flange portion 8 (see FIG. 5).

この円盤体に、少なくとも直径方向で相対向して切欠部19,19を形成し、それら切欠部19,19の正回転方向側で点対称配置の辺縁20,20を、それぞれ斜め下方へ折り曲げ、かつ、その辺縁20.20を直径方向へ適宜間隔で切り欠いて掘削爪部21,21を形成してなる。   Notches 19 and 19 are formed in this disk body so as to face each other at least in the diameter direction, and the edges 20 and 20 that are point-symmetrically arranged on the side of the notches 19 and 19 in the positive rotation direction are bent obliquely downward, respectively. In addition, the excavation claw portions 21 and 21 are formed by cutting out the edge 20.20 in the diameter direction at appropriate intervals.

掘削爪部21の先端部は傾斜刃部22として正回転時に土に食い込むように形成されている。この掘削ヘッド9の前記係合突起部17,17は、円盤状体18の中心部付近に同芯円上で相対向する一対の逆L形部材を点対称配置にて溶接等で固定してなる。   The tip of the excavation claw portion 21 is formed as an inclined blade portion 22 so as to bite into the soil during normal rotation. The engaging projections 17 and 17 of the excavation head 9 are formed by fixing a pair of opposite L-shaped members facing each other on a concentric circle near the center of the disc-like body 18 by welding or the like in a point-symmetric arrangement. Become.

次に再び図1に戻り、前記杭施工装置を用いた杭施工方法を説明すると、図1(B)に示すように、掘削ヘッド9をロッド12と連結してオーガ駆動機3でロッド12を正回転させるととともに、ロッド12にエアーを供給すると、掘削爪部21が地盤Eを削って切欠部19,19から上方へ送り移動させ、エアー噴出口15から噴出するエアーにより撹乱されることで、掘削土はフランジ部8に案内されて中空杭7内へ導入され、中空杭7内で回転している螺旋羽根13a,13bにて上方へ効率高く上昇移動し、中空杭7の上端部から外部に排出される。   Next, returning to FIG. 1 again, a pile construction method using the pile construction apparatus will be described. As shown in FIG. 1 (B), the excavation head 9 is connected to the rod 12 and the auger drive machine 3 is used to connect the rod 12. When the rod 12 is rotated forward and air is supplied to the rod 12, the excavation claw portion 21 cuts the ground E and is moved upward from the notches 19 and 19 and is disturbed by the air ejected from the air ejection port 15. The excavated soil is guided by the flange portion 8 and introduced into the hollow pile 7, and is efficiently moved upward by the spiral blades 13 a and 13 b rotating in the hollow pile 7, from the upper end portion of the hollow pile 7. It is discharged outside.

ついで図1(C)に示すように、掘削ヘッド9の掘削進行に伴いながら、掘削ヘッド9とフランジ部8の間隔を一定に保つべく、圧入機5を操作してシリンダー11,11を駆動し、ラム10,10を下方へ押し出してチャッキング部材6を介し中空杭7を地中孔22内へ押しこむ。   Next, as shown in FIG. 1 (C), as the excavation head 9 proceeds with excavation, the cylinders 11 and 11 are driven by operating the press-fitting machine 5 so as to keep the distance between the excavation head 9 and the flange portion 8 constant. Then, the rams 10 and 10 are pushed downward, and the hollow pile 7 is pushed into the underground hole 22 through the chucking member 6.

ついで図1(D)に示すように、地中孔22が所定の深さに達すると、ロッド12の正回転を止めて逆回転させることで突起部16と係合突起部17の連結を解き、オーガ駆動機3をタワー2に沿い上昇移動させてオーガスクリュウ4を中空杭7から上方へ引き抜く。これにより、掘削ヘッド9は地中孔22の内底に残留することになる。   Next, as shown in FIG. 1 (D), when the underground hole 22 reaches a predetermined depth, the forward rotation of the rod 12 is stopped and the reverse rotation is performed to release the connection between the protrusion 16 and the engagement protrusion 17. Then, the auger drive 3 is moved upward along the tower 2 and the auger screw 4 is pulled upward from the hollow pile 7. As a result, the excavation head 9 remains on the inner bottom of the underground hole 22.

そして図1(E)に示すように、地中孔22の底に残置された掘削ヘッド9と中空杭7のフランジ部8とを接合するため、圧入機5を操作してシリンダー11,11を駆動し、ラム10,10を下方へ押し出してチャッキング部材6を介し中空杭7を地中孔22内へ最大限度で押しこむことにより、フランジ部8は掘削ヘッド9の盤面に接する。この場合、掘削ヘッド9の盤面とフランジ部8との間に接着剤を介在させることにより、両者の接合が確実化する。接着剤はセメントミルク等とし、この液状体を地中孔22の内底に供給することで実行される。   And as shown in FIG.1 (E), in order to join the excavation head 9 left in the bottom of the underground hole 22, and the flange part 8 of the hollow pile 7, the press-fitting machine 5 is operated and cylinders 11 and 11 are connected. The flange portion 8 comes into contact with the surface of the excavation head 9 by driving and pushing the rams 10 and 10 downward and pushing the hollow pile 7 into the underground hole 22 through the chucking member 6 to the maximum extent. In this case, by joining an adhesive between the surface of the excavation head 9 and the flange portion 8, the bonding between the two is ensured. The adhesive is cement milk or the like, and this liquid is supplied to the inner bottom of the underground hole 22 for execution.

かくして、地中孔22内に中空杭7が建て込まれると、中空杭7の外周部と地中孔22の内壁部との間から地中孔22の底に所定量のモルタル又は生コンクリートを注入して杭根部23を形成する。これにより、フランジ部8はモルタル又は生コンクリートと結合して中空杭7はその直径よりも大きい直径の球根状の支持部を有するに至る。杭根部23の上部に残る空間部24は、地中孔22の内壁が自然崩壊して埋め尽くすのを許容するか、若しくは、中空杭7から排出された掘削土25を埋め戻して充満させれば良い。   Thus, when the hollow pile 7 is built in the underground hole 22, a predetermined amount of mortar or ready concrete is placed on the bottom of the underground hole 22 from between the outer peripheral portion of the hollow pile 7 and the inner wall portion of the underground hole 22. The pile root portion 23 is formed by pouring. Thereby, the flange part 8 couple | bonds with mortar or ready-mixed concrete, and the hollow pile 7 has a bulbous support part with a diameter larger than the diameter. The space 24 remaining in the upper portion of the pile root portion 23 allows the inner wall of the underground hole 22 to be naturally collapsed and filled, or the excavated soil 25 discharged from the hollow pile 7 is backfilled and filled. It ’s fine.

なお、掘削ヘッド9の回転中心に透孔を穿設し、この透孔に遊嵌する柱状突起をジョイントブック14のブロック14bの下端面中央に、ロッド12の軸方向で、突出させて設け、突起部16を係合突起部17と係合させるときの位置決め手段としてもよい。   In addition, a through hole is formed in the rotation center of the excavation head 9, and a columnar protrusion that is loosely fitted in the through hole is provided in the center of the lower end surface of the block 14b of the joint book 14 so as to protrude in the axial direction of the rod 12. It is good also as a positioning means when engaging the projection part 16 with the engagement projection part 17. FIG.

また、中空杭7のフランジ部8は、前記従来例において記載したような環状板体の一部を半径方向へ切り欠き、かつ、その両端部を互いに反する方向へ曲げて螺旋状にしたもの、若しくは、円盤を中心で二分した半円盤状体を、互いに交差した状態で杭の先端に溶接したものとしてもよい。この場合、螺旋羽根のフランジ部を備えた中空杭7は左回転させるべく、そのために、圧入機5に代えた中空杭7の回転圧入機を必要とする。   Further, the flange portion 8 of the hollow pile 7 is formed by notching a part of the annular plate body as described in the above-mentioned conventional example in the radial direction and bending the both end portions in directions opposite to each other in a spiral shape, Or it is good also as what welded to the front-end | tip of the pile in the state which mutually cross | intersected the semi-disc body which divided into 2 centered on the disk. In this case, in order to rotate the hollow pile 7 provided with the flange portion of the spiral blade to the left, a rotary press-fitting machine for the hollow pile 7 instead of the press-fitting machine 5 is required.

さらに、オーガスクリュウ4の螺旋羽根13bは、出願人が先に出願した特願平11−282347号に記載の、アジテーターに代えてもよい。これは、例えばロッド12の軸方向に所定間隔で複数の、それぞれロッド12の直径方向で相対向する一対の撹拌羽根が互いに相反する方向へ傾斜し、かつ、ロッドと平行方向へ折り畳み可能に軸支されてなるものである。アジテーターはロッド12の正回転によって折り畳まれた状態から拡径して広がり、逆回転によってロッド12側へ折り畳まれて収縮する構造である。   Further, the spiral blade 13b of the auger screw 4 may be replaced with an agitator described in Japanese Patent Application No. 11-282347 filed earlier by the applicant. For example, a plurality of stirring blades facing each other in the diameter direction of the rod 12 at a predetermined interval in the axial direction of the rod 12 are inclined in directions opposite to each other and can be folded in a direction parallel to the rod. It will be supported. The agitator has a structure in which the diameter of the agitator expands from the state of being folded by the forward rotation of the rod 12 and is contracted by being folded toward the rod 12 by the reverse rotation.

(A)から(E)はこの発明にかかる杭施工方法の実施例を示す工程図であり、(B)から(E)は(A)の要部のみを表している。(A) to (E) is process drawing which shows the Example of the pile construction method concerning this invention, (B) to (E) represents only the principal part of (A). この発明にかかる杭施工装置の要部を示す一部断面正面図である。It is a partial cross section front view which shows the principal part of the pile construction apparatus concerning this invention. 杭施工装置におけるオーガスクリュウと掘削ヘッドの要部拡大図である。It is a principal part enlarged view of the auger screw and excavation head in a pile construction apparatus. (A)は掘削ヘッドの正面図、(B)は掘削ヘッドの側面図である。(A) is a front view of an excavation head, (B) is a side view of an excavation head. 中空杭と掘削ヘッドの関係を示す断面平面図である。It is a cross-sectional top view which shows the relationship between a hollow pile and an excavation head.

符号の説明Explanation of symbols

1…ベースマシン
2…タワー
3…オーガ駆動機
4…オーガスクリュ
5…圧入機
6…チャッキング部材
7…中空杭
8…フランジ部
9…掘削ヘッド
10…ラム
11…シリンダー
12…ロッド
13a,13b…螺旋羽根
14…ジョイントブロック
15…エアー噴出口
16…突起部
17…係合突起部
19…切欠部
20…辺縁
21…掘削爪部
22…地中孔
23…杭根部
24…空間部
25…掘削土
DESCRIPTION OF SYMBOLS 1 ... Base machine 2 ... Tower 3 ... Auger drive machine 4 ... Auger screw 5 ... Press-fitting machine 6 ... Chucking member 7 ... Hollow pile 8 ... Flange part 9 ... Excavation head 10 ... Ram 11 ... Cylinder 12 ... Rod 13a, 13b ... Spiral blade 14 ... joint block 15 ... air outlet 16 ... projection 17 ... engagement projection 19 ... notch 20 ... edge 21 ... excavation claw 22 ... underground hole 23 ... pile root 24 ... space 25 ... excavation soil

Claims (6)

ベースマシンのタワーに昇降可能に支持したオーガ駆動機にオーガスクリュウを回転自在に吊支し、このオーガスクリュウには下端にフランジ部を設けた軸方向中空の杭を挿通し、この杭の上端部側をチャッキング部材を介して地中へ押し込むための圧入機を前記タワーに昇降可能に支持し、前記オーガスクリュウの下端部には掘削爪部を有する円盤状の掘削ヘッドを着脱可能に係合し、この掘削ヘッドの正回転により掘削した地中孔内に前記杭を圧入し、この掘削ヘッドと前記杭のフランジ部との間隔を適宜開いた状態で掘削を進行することにより、掘削土砂を前記杭内へ導入して前記オーガスクリュウにて中空部を上昇させて外部へ排出しながら地中孔を掘削するともに、杭を地中孔へ押し込む作業を継続して前記杭を地中孔に埋設した後、前記オーガスクリュウを逆回転させて前記掘削ヘッドとの係合を解除し、かつ、オーガスクリュウを前記杭から引き抜いた後、前記掘削ヘッドとフランジ部上の前記地中孔内底にモルタル又は生コンクリートを注入して前記杭の直径よりも大きい直径の根部を形成することを特徴とする杭施工方法。 An auger screw is rotatably supported by an auger drive supported on a tower of a base machine so as to be movable up and down, and an axial hollow pile having a flange portion at the lower end is inserted into the auger screw, and an upper end portion of the pile is inserted. A press-fitting machine for pushing the side into the ground via a chucking member is supported by the tower so that it can be raised and lowered, and a disc-shaped excavation head having an excavation claw portion is detachably engaged with the lower end of the auger screw Then, the pile is press-fitted into the underground hole excavated by the forward rotation of the excavation head, and the excavation sediment is removed by proceeding with excavation with an appropriate distance between the excavation head and the flange portion of the pile. While excavating the underground hole while introducing into the pile and raising the hollow part with the auger screw and discharging it to the outside, the work of pushing the pile into the underground hole is continued to make the pile into the underground hole Buried The auger screw is reversely rotated to release the engagement with the excavation head, and after the auger screw is pulled out from the pile, the mortar or raw mortar is formed on the bottom of the underground hole on the excavation head and the flange portion. A pile construction method characterized by injecting concrete to form a root having a diameter larger than the diameter of the pile. ベースマシンのタワーに昇降可能に支持したオーガ駆動機にオーガスクリュウを回転自在に吊支し、このオーガスクリュウには下端にフランジ部を設けた軸方向中空の杭を挿通し、この杭の上端部側をチャッキング部材を介して地中へ押し込むための圧入機を前記タワーに昇降可能に支持し、前記オーガスクリュウの下端部には掘削爪部を有する円盤状の掘削ヘッドを着脱可能に係合し、この掘削ヘッドの正回転により掘削した地中孔内に前記杭を圧入し、この掘削ヘッドと前記杭のフランジ部との間隔を適宜開いた状態でオーガスクリュウの下端側からエアーを噴出させながら掘削を進行することにより、掘削土砂を前記杭内へ導入して前記オーガスクリュウにて中空部を上昇させて外部へ排出しながら地中孔を掘削するともに、杭を地中孔へ押し込む作業を継続して前記杭を地中孔に埋設した後、前記オーガスクリュウを逆回転させて前記掘削ヘッドとの係合を解除し、かつ、オーガスクリュウを前記杭から引き抜いた後、セメントミルク等を地中孔内へ注入して前記掘削ヘッドとフランジ部とを結合し、かつ、前記掘削ヘッドとフランジ部上の前記地中孔内にモルタル又は生コンクリートを注入して前記杭の直径よりも大きい直径の根部を形成することを特徴とする杭施工方法。   An auger screw is rotatably supported by an auger drive supported on a tower of a base machine so as to be movable up and down, and an axial hollow pile having a flange portion at the lower end is inserted into the auger screw, and an upper end portion of the pile is inserted. A press-fitting machine for pushing the side into the ground via a chucking member is supported by the tower so that it can be raised and lowered, and a disc-shaped excavation head having an excavation claw portion is detachably engaged with the lower end of the auger screw Then, the pile is press-fitted into the underground hole excavated by the forward rotation of the excavation head, and air is blown out from the lower end side of the auger screw in a state where the distance between the excavation head and the flange portion of the pile is appropriately opened. While excavating, the excavated earth and sand are introduced into the pile, the auger screw lifts the hollow portion and discharges it to the outside while excavating the underground hole, After the pile is buried in the underground hole, the auger screw is reversely rotated to release the engagement with the excavation head, and the auger screw is pulled out from the pile, Diameter of the pile by injecting milk or the like into the underground hole to join the excavation head and the flange portion, and injecting mortar or ready concrete into the underground hole on the excavation head and the flange portion A pile construction method characterized by forming a root portion having a larger diameter. 前記掘削ヘッドの直径寸法が、前記杭の直径寸法の少なくとも2倍である掘削ヘッドを用いることを特徴とする請求項1又は2記載の杭施工方法。   3. The pile construction method according to claim 1, wherein the excavation head has a diameter dimension that is at least twice the diameter dimension of the pile. ベースマシンのタワーに昇降可能に支持したオーガ駆動機に回転自在に吊支されたオーガスクリュウと、このオーガスクリュウが貫通する下端にフランジ部を設けた軸方向中空の杭と、この杭の上端部側をチャッキング部材を介して地中へ押し込むため前記タワーに昇降可能に支持した杭圧入機と、前記オーガスクリュウのロッド下端に着脱可能に係合して掘削爪を有する円盤状の掘削ヘッドとからなることを特徴とする杭施工装置。   An auger screw that is rotatably supported by an auger drive supported up and down by a tower of the base machine, an axially hollow pile having a flange portion at a lower end through which the auger screw passes, and an upper end portion of the pile A pile presser that is movably supported by the tower so as to push the side into the ground via a chucking member, and a disk-shaped excavation head having an excavation claw removably engaged with the lower end of the auger screw rod; The pile construction apparatus characterized by consisting of. 前記掘削ヘッドは、円盤状体の中心部付近にオーガスクリュウのロッド下端の突起部が係脱可能な係合突起部を形成するとともに、この円盤状体に少なくとも直径方向で相対向して切欠部を形成し、その切欠部の点対称配置の辺縁を斜め下方へ折り曲げ、かつ、その辺縁を適宜切り欠いて掘削爪を形成してなることを特徴とする請求項4記載の杭施工装置。   The excavation head is formed with an engaging projection that allows the projection at the lower end of the rod of the auger screw to be engaged and disengaged in the vicinity of the center of the disc-like body, and at least a diametrically opposed notch 5. The pile construction device according to claim 4, wherein the edge of the notch is symmetrically bent downward and the excavation claw is formed by appropriately notching the edge. . 前記係合突起部は円盤状体の中心部付近に同芯円上で相対向する一対の逆L形部材を点対称配置で固定してなる一方、前記オーガスクリュウのロッド下端の突起部は外周面から直径方向へ突出するI形部材の突起部が設けられてなることを特徴とする請求項5記載の杭施工装置。
The engaging projection is formed by fixing a pair of inverted L-shaped members facing each other on a concentric circle in the vicinity of the center of the disk-like body in a point-symmetrical arrangement, while the projection at the lower end of the auger screw rod has an outer periphery. 6. The pile construction apparatus according to claim 5, wherein a protruding portion of an I-shaped member protruding in a diameter direction from the surface is provided.
JP2004028869A 2004-02-05 2004-02-05 Pile construction method and equipment therefor Pending JP2005220594A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102400465A (en) * 2010-09-10 2012-04-04 湖北毅力机械有限公司 Static pressure moderately-excavated pile pressing machine and static pressure moderately-excavated pile pressing construction method
EP2944726A1 (en) * 2014-04-30 2015-11-18 Roger Bullivant Limited Improvements in or relating to methods and apparatus for use in forming piles
CN106948762A (en) * 2017-05-12 2017-07-14 李广信 The stake of CFG reducing back tapers stepped ramp type and preparation method and drilling tool
CN110761954A (en) * 2019-11-19 2020-02-07 中国电建集团西北勘测设计研究院有限公司 Prefabricated concrete fan tower cylinder with spiral line connecting seam and connecting method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102400465A (en) * 2010-09-10 2012-04-04 湖北毅力机械有限公司 Static pressure moderately-excavated pile pressing machine and static pressure moderately-excavated pile pressing construction method
EP2944726A1 (en) * 2014-04-30 2015-11-18 Roger Bullivant Limited Improvements in or relating to methods and apparatus for use in forming piles
CN106948762A (en) * 2017-05-12 2017-07-14 李广信 The stake of CFG reducing back tapers stepped ramp type and preparation method and drilling tool
CN106948762B (en) * 2017-05-12 2023-12-08 李广信 CFG reducing back taper stepped pile, preparation method and drilling tool
CN110761954A (en) * 2019-11-19 2020-02-07 中国电建集团西北勘测设计研究院有限公司 Prefabricated concrete fan tower cylinder with spiral line connecting seam and connecting method
CN110761954B (en) * 2019-11-19 2024-01-19 中国电建集团西北勘测设计研究院有限公司 Precast concrete fan tower barrel with spiral line connecting seam and connecting method

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