JP2007009657A - Sand pile forming method and sand pile forming machine - Google Patents

Sand pile forming method and sand pile forming machine Download PDF

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JP2007009657A
JP2007009657A JP2005195591A JP2005195591A JP2007009657A JP 2007009657 A JP2007009657 A JP 2007009657A JP 2005195591 A JP2005195591 A JP 2005195591A JP 2005195591 A JP2005195591 A JP 2005195591A JP 2007009657 A JP2007009657 A JP 2007009657A
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excavation
sand pile
hollow tube
pile
head
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Toshimi Kubo
俊美 久保
Toshiro Hara
俊郎 原
Narihiro Ikegami
成洋 池上
Nobuo Yukihara
伸男 行原
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Japan Industrial Land Development Co Ltd
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Japan Industrial Land Development Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-vibration/low-noise type sand pile forming method and a sand pile forming machine by which the penetration efficiency of a hollow pipe is enhanced in excavation, a pile material is compacted effectively, and a continuous sand pile having an arbitrary shape in a vertical cross section can be formed. <P>SOLUTION: A hollow excavation head 2 is integrally rotatably mounted to the lower part of a sand pile forming hollow pipe 1. The excavation head 2 comprises an excavation bit 3 mounted at the lower end of a head body 6 in a protruding manner, a compacting member 5 protruding outward from the peripheral surface of the head body 6 at a substantially right angle so that the hole wall of a bore hole 4 may be compacted by moving excavated soil aside while rotating, and a hydraulic cylinder 9 to move the compacting member 5 back and forth. In repenetration for compaction, the compacting member 5 is made to protrude from the peripheral surface of the head body 6 so as to carry out firm compaction while pressing the pile material against the wall side of the bore hole 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、軟弱地盤に砂杭造成する砂杭造成工法および砂杭造成機に関するものであり、特に、バイブローハンマー(起振機)を使用しないで砂杭を造成できる低振動、低騒音型の砂杭造成工法および砂杭造成機に関するものである。     The present invention relates to a sand pile construction method and a sand pile construction machine for creating a sand pile on soft ground, and in particular, a low vibration and low noise type capable of creating a sand pile without using a vibratory hammer (vibrator). The present invention relates to a sand pile construction method and a sand pile construction machine.

陸地の軟弱地盤に砂杭を造成する場合、特に、近くに人家や病院、学校等があるときには、砂杭造成時に発生する振動や騒音に極力注意する必要がある。   When sand piles are created on soft ground on land, it is necessary to pay close attention to vibration and noise generated during sand pile construction, especially when there are nearby houses, hospitals, schools, etc.

しかしながら、従来の砂杭造成法の多くは、砂杭造成用中空管の貫入及び引抜き時並びに砂杭拡径と締固めのための再貫入時に、バイブロハンマーを使用していた。この場合、発生する振動や騒音が基準値を越えないように注意しながら施工せざるを得なかったので、高品質の締固め砂杭を得ることが難しく、工期も長くなって工事費も高くなる。   However, many of the conventional sand pile building methods use a vibro hammer at the time of penetration and withdrawal of the hollow pipe for sand pile creation and at the time of re-penetration for sand pile diameter expansion and compaction. In this case, it was difficult to obtain high-quality compacted sand piles because construction had to be done with care so that the generated vibrations and noise did not exceed the standard values, and the construction period was long and the construction cost was high. Become.

そこで、中空管の軟弱地盤への貫入方法として、バイブロハンマーを使用せず、油圧ロータリードライブにより中空管をその円周方向に回転させることによって、低振動・低騒音で砂杭を造成する工法も、既に提案されている(例えば、特許文献１参照)。   Therefore, as a method of penetrating the hollow pipe into the soft ground, a sand pile is created with low vibration and low noise by rotating the hollow pipe in the circumferential direction by a hydraulic rotary drive without using a vibro hammer. A construction method has already been proposed (see, for example, Patent Document 1).

前記工法は、中空管の下端に掘削ビットを取り付け、中空管と共に掘削ビットを正逆両方向に回転をさせて砂杭を造成するものである。この造成の打設サイクルでは、一般に、回転駆動する中空管を地中に貫入しながら所定の深度まで掘削を行う工程と、中空管からパイル材を排出しつつ中空管を引き抜く工程と、中空管の再貫入によりパイル材を締め固める工程とを有し、前記中空管の引き抜き及び再貫入を適宜繰り返しながら、所定径の砂杭を連続造成して軟弱地盤の改良を行うようにしている。
特開平８−２８４１４６号公報。 In the construction method, a drill bit is attached to the lower end of the hollow pipe, and the drill bit is rotated in both forward and reverse directions together with the hollow pipe to form a sand pile. In this construction driving cycle, generally, a step of excavating to a predetermined depth while penetrating the hollow tube to be driven to rotate, and a step of pulling out the hollow tube while discharging the pile material from the hollow tube, And a step of compacting the pile material by re-penetration of the hollow tube, and while continuously repeating drawing and re-penetration of the hollow tube, a sand pile having a predetermined diameter is continuously formed to improve the soft ground I have to.
JP-A-8-284146.

しかしながら、特許文献１記載の発明は、中空管の径サイズが一定であるので、例えば、径サイズの大きい砂杭を造成する際は、それに応じて径サイズの大きい中空管を使用する必要がある。しかし、この場合は中空管の径が大きくなるに伴い、掘削時における中空管の貫入において、土中から大きな抵抗を受けて、中空管の貫入効率が低下する。   However, in the invention described in Patent Document 1, since the diameter of the hollow pipe is constant, for example, when a sand pile having a large diameter is created, it is necessary to use a hollow pipe having a large diameter accordingly. There is. However, in this case, as the diameter of the hollow tube increases, the penetration efficiency of the hollow tube decreases due to large resistance from the soil when the hollow tube penetrates during excavation.

中空管の貫入効率を高めるには、径サイズの小さい中空管を使用すればよいが、この場合は、径サイズの大きい所要の砂杭を効率良く造成することができなくなる。また、中空管の再貫入時に、中空管の径サイズが小さくなるに伴い、中空管の下端部分（絞め固め部分）の横断面積及び体積が小さくなって、パイル材の締め固めを効果的に行うことが困難になる。   In order to increase the penetration efficiency of the hollow tube, a hollow tube having a small diameter may be used, but in this case, a required sand pile having a large diameter cannot be efficiently formed. Moreover, when the hollow tube is re-penetrated, the cross-sectional area and volume of the lower end portion (constriction portion) of the hollow tube are reduced as the diameter of the hollow tube is reduced. It is difficult to do it automatically.

更に、中空管の径サイズが一定であるので、造成される砂杭径は、地中の深度方向（上下高さ方向）において常に一定の大きさになる。従って、地中の深度方向における任意箇所において、径の異なる砂杭径、換言すれば、砂杭の縦断面形状の異なるものを造成することができないという問題があった。   Furthermore, since the diameter size of the hollow tube is constant, the diameter of the sand pile to be created is always constant in the depth direction (vertical height direction) in the ground. Therefore, there has been a problem that sand pile diameters having different diameters, in other words, sand piles having different vertical cross-sectional shapes cannot be created at arbitrary locations in the depth direction in the ground.

そこで、掘削時における中空管の貫入効率を高め、パイル材の締め固めを効果的に行い、任意の縦断面形状を有する砂杭を造成することができる低振動、低騒音型の砂杭造成工法および砂杭造成機を提供するために解決すべき技術的課題が生じてくるのであり、本発
明はこの課題を解決することを目的とする。 Therefore, low-vibration, low-noise sand pile creation that can increase the penetration efficiency of the hollow tube during excavation, effectively compact the pile material, and create sand piles with any vertical cross-sectional shape The technical problem which should be solved arises in order to provide a construction method and a sand pile construction machine, and this invention aims at solving this problem.

本発明は上記目的を達成するために提案されたものであり、請求項１記載の発明は、掘削ビットを下側に突出させて成る掘削ヘッドを砂杭造成用中空管の下端に一体回転可能に取り付けて砂杭を造成する工法であって、前記中空管を回転力・押し込み力をもって地中に貫入しながら所定の深度まで掘削孔を掘削する工程と、該中空管からパイル材を前記掘削孔に排出しつつ該中空管を引き抜く工程と、該中空管の再貫入により前記パイル材を締め固める工程とを有し、前記掘削孔の掘削後に、前記掘削ヘッドの周面から締め固め部材を外側に向かってほぼ直角に突出させ、前記中空管の再貫入時に、前記締め固め部材により前記パイル材を周囲に押し付けて締め固めるようにした砂杭造成工法を提供する。   The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that the excavation head formed by projecting the excavation bit downward is integrally rotated with the lower end of the hollow pipe for sand pile formation. A method of constructing a sand pile by attaching the hollow pipe to a predetermined depth while penetrating the hollow pipe into the ground with a rotational force and a pushing force, and a pile material from the hollow pipe A step of pulling out the hollow tube while discharging the hole to the excavation hole, and a step of compacting the pile material by re-penetration of the hollow tube, and after the excavation of the excavation hole, the peripheral surface of the excavation head A sand pile construction method is provided in which a compacting member is protruded substantially perpendicularly toward the outside and the pile material is pressed against the periphery by the compacting member when the hollow tube is re-penetrated.

この工法によれば、前記中空管を、回転力・押し込み力をもって、地中に貫入しながら所定の深度まで掘削孔を掘削する。この後、中空管からパイル材を掘削孔に排出し、又、掘削ヘッドの周面から締め固め部材を外側に向かってほぼ直角に突出させる。締め固め部材を突出させた状態で、中空管の引き抜きと再貫入を繰り返し行う。つまり、締め固め部材は、所定深度までの掘削工程では退避状態であるが、パイル材の絞め固め工程では突出状態にセットされる。   According to this construction method, an excavation hole is excavated to a predetermined depth while penetrating the hollow tube into the ground with rotational force and pushing force. Thereafter, the pile material is discharged from the hollow tube into the excavation hole, and the compacting member is protruded from the peripheral surface of the excavation head at a substantially right angle toward the outside. With the compaction member protruding, the hollow tube is repeatedly pulled out and re-penetrated. That is, the compacting member is in a retracted state in the excavation process up to a predetermined depth, but is set in a protruding state in the pile material compacting process.

請求項２記載の発明は、ヘッド本体と、該ヘッド本体の下端部に下側に突出して設けられた掘削ビットと、掘削中に前記ヘッド本体の周面から外側に向かってほぼ直角に突出され、パイル材を側方へ押圧移動させて掘削孔の孔面を締め固めする進退出可能な締め固め部材と、該締め固め部材の進退出駆動を行わせる駆動手段とを備える中空の掘削ヘッドを、回転自在な砂杭造成用中空管の下部に一体回転可能に取り付けたことを特徴とする砂杭造成機を提供する。   According to a second aspect of the present invention, there is provided a head main body, a drilling bit provided to protrude downward from a lower end portion of the head main body, and a right angle protruding outward from a peripheral surface of the head main body during excavation. A hollow excavation head comprising a compaction member capable of advancing and retreating by pressing and moving the pile material to the side and compacting the hole surface of the excavation hole; and a driving means for performing advance and retreat drive of the compaction member Provided is a sand pile forming machine characterized in that it is attached to a lower part of a rotatable hollow pipe for sand pile formation so as to be integrally rotatable.

この構成によれば、掘削が開始された貫入時においては、締め固め部材を掘削ヘッドの周面から内側に退避させた状態で掘削を開始する。また、貫入後の締め固め時には、締め固め部材を突出移動させた状態でパイル材を締め固める。この場合、孔壁が崩れることもなく、中空管の貫入、引き抜きが簡単に行える。   According to this configuration, at the time of penetration when excavation is started, excavation is started in a state where the compacting member is retracted inward from the peripheral surface of the excavation head. Further, at the time of compaction after penetration, the pile material is compacted with the compaction member protruding and moved. In this case, the hollow wall can be easily inserted and pulled out without breaking the hole wall.

請求項３記載の発明は、上記締め固め部材を円周方向に等間隔ずつずらせて複数個設けた砂杭造成機を提供する。   The invention described in claim 3 provides a sand pile forming machine in which a plurality of the compaction members are provided at equal intervals in the circumferential direction.

この構成によれば、パイル材の締め固めは、円周方向に等間隔ずつずらせて設けられた複数個の締め固め部材を、砂杭造成用中空管と共に回転させて行うので、締め固め力が平均に分散されて、掘削ヘッドや砂杭造成用中空管の軸芯がずれたり、傾いたりすることなく円滑に回転駆動される。   According to this configuration, the pile material is compacted by rotating a plurality of compaction members provided at equal intervals in the circumferential direction together with the sand pile forming hollow tube. Are dispersed on average, and the shaft core of the excavation head and the hollow pipe for sand pile formation is smoothly rotated without being displaced or tilted.

請求項４記載の発明は、上記締め固め部材の外側先端形状を半球状の曲面で形成した砂杭造成機を提供する。   The invention according to claim 4 provides a sand pile forming machine in which the outer tip shape of the compaction member is formed as a hemispherical curved surface.

この構成によれば、締め固め部材の外側先端形状が半球状の曲面で形成されているので、締め固め部材を周面から外側に突出させた状態で、砂杭造成用中空管と共に回転する掘削ヘッドの回転抵抗が小さくなり、小さな回転手段により砂杭造成用中空管と掘削ヘッドを回転させることができる。   According to this configuration, since the outer tip shape of the compaction member is formed as a hemispherical curved surface, the compaction member rotates together with the sand pile forming hollow tube in a state of projecting outward from the peripheral surface. The rotational resistance of the excavation head is reduced, and the sand pile building hollow pipe and the excavation head can be rotated by a small rotating means.

請求項５記載の発明は、上記掘削ヘッドを、上記中空管に対して着脱可能に取り付けた砂杭造成機を提供する。   The invention according to claim 5 provides a sand pile building machine in which the excavation head is detachably attached to the hollow tube.

この構成によれば、掘削ヘッドを、土質等、掘削環境に応じたものと簡単に交換して使用することができる。   According to this configuration, the excavation head can be used by simply exchanging it with one according to the excavation environment such as soil quality.

請求項６記載の発明は、上記駆動手段を油圧力で駆動するようにした砂杭造成機を提供する。   The invention described in claim 6 provides a sand pile building machine in which the driving means is driven by hydraulic pressure.

この構成によれば、掘削ヘッドにおける締め固め部材の進退出を、油圧力を用いて、静かに、また大きな力で動作させることができる。   According to this configuration, the advancement / retraction of the compaction member in the excavation head can be operated quietly and with a large force using the hydraulic pressure.

請求項１記載の発明は、締め固め部材は、所定深度までの掘削工程では退避位置に収納されているので、土中から受ける中空管の貫入抵抗が従来に比べ小さくなり、中空管の掘削、貫入作業を高効率に行うことができる。又、パイル材の締め固め工程では、締め固め部材は掘削ヘッドから突出するので、掘削ヘッドの絞め固め部分の横断面積及び体積が増大して、径サイズの大きい砂杭の造成であっても、パイル材の締め固めを効果的に行うことができる。この場合、中空管の引き抜きが容易であり、強固で高品質の締め固め砂杭を円滑かつ迅速に施工することができる。   In the invention described in claim 1, since the compaction member is housed in the retracted position in the excavation process up to a predetermined depth, the penetration resistance of the hollow tube received from the soil is smaller than the conventional one, and the hollow tube Excavation and penetration work can be performed with high efficiency. Also, in the pile material compaction process, the compaction member protrudes from the excavation head, so that the cross-sectional area and volume of the compaction portion of the excavation head increase, and even when creating a sand pile with a large diameter size, The pile material can be compacted effectively. In this case, the hollow tube can be easily pulled out, and a strong and high-quality compacted sand pile can be constructed smoothly and quickly.

更に、締め固め部材は、地中の深度方向における任意箇所において、掘削ヘッドからの突出量（退避状態である突出量０を含む）に適宜設定変更して、径寸法の異なる砂杭を連続造成できるので、地盤状況や設計条件等に応じて、所望の縦断面形状を有する砂杭を容易迅速に造成施工できるという優れた効果がある。   Furthermore, the compaction member is appropriately set and changed to the amount of protrusion from the excavation head (including the amount of protrusion 0 in the retracted state) at an arbitrary location in the depth direction of the ground, and sand piles having different diameters are continuously formed. Therefore, there is an excellent effect that sand piles having a desired vertical cross-sectional shape can be easily and quickly constructed according to the ground conditions, design conditions, and the like.

請求項２記載の発明の砂杭造成機を使用して掘削した場合は、砂杭造成用中空管と一体に掘削ヘッドが回転し、その位置で掘削ビットが土砂の掘削を開始するので、締め固め部材を掘削ヘッドの周面から内側に退避させた状態で掘削を開始する。又、砂材の絞め固め工程時には、締め固め部材を突出状態にセットすることにより、掘削孔に排出されたパイル材が周辺領域に向けて押し付けられ強固に締め固められる。   When excavating using the sand pile forming machine of the invention of claim 2, the excavation head rotates integrally with the sand pile forming hollow pipe, and the excavation bit starts excavation of earth and sand at that position. The excavation is started in a state where the compacting member is retracted inward from the peripheral surface of the excavation head. Further, during the sanding and compacting step, the compacting member is set in a protruding state so that the pile material discharged to the excavation hole is pressed toward the peripheral region and firmly compacted.

請求項３記載の発明は、締め固めを行うときに締め固め力が平均に分散されて、掘削ヘッドや砂杭造成用中空管の軸芯がずれたりすることがないので、請求項２の発明の効果に加えて、さらに高品質の締め固め砂杭を得ることができる。   In the invention according to claim 3, the compaction force is dispersed to the average when compacting, and the shaft core of the excavation head and the sand pile forming hollow tube is not displaced. In addition to the effects of the invention, a higher quality compacted sand pile can be obtained.

請求項４記載の発明は、砂杭造成用中空管と共に回転する掘削ヘッドの回転抵抗が小さくなるので、請求項２または３記載の発明の効果に加えて、回転手段の小形化小形化とコストの低減を図ることができる。   In the invention described in claim 4, since the rotational resistance of the excavation head rotating together with the sand pile forming hollow pipe is reduced, in addition to the effect of the invention described in claim 2 or 3, the rotating means can be reduced in size and size. Cost can be reduced.

請求項５記載の発明は、掘削ヘッドを、土質等、掘削環境に応じたものと簡単に交換して使用することができるので、請求項２，３または４記載の発明の効果に加えて、さらに高品質、かつ強固な締め固め砂杭をスムーズに施工することができる。   The invention according to claim 5 can be used by easily exchanging the excavation head with a material suitable for the excavation environment such as soil, etc. In addition to the effect of the invention according to claim 2, 3 or 4, In addition, high-quality and strong compacted sand piles can be constructed smoothly.

請求項６記載の発明は、掘削ヘッドにおける締め固め部材の突出退避動作を、油圧の力を用いて、静かに、また大きな力で動作させることができるので、請求項２，３，４または５記載の発明の効果に加えて、低振動・低騒音で、かつ、締め固め力の大きい砂杭造成機を容易に得ることができる。   According to the sixth aspect of the present invention, the protruding and retracting operation of the compacting member in the excavation head can be operated quietly and with a large force by using the hydraulic force. In addition to the effects of the described invention, it is possible to easily obtain a sand pile forming machine with low vibration and low noise and high compaction force.

以下、本発明について、好適な実施例をあげて説明する。本発明の最良形態は、掘削時における中空管の貫入効率を高め、パイル材の締め固めを効果的に行い、任意の縦断面形状を有する砂杭を造成できる低振動、低騒音型の砂杭造成工法および砂杭造成機を得ると
いう目的を達成するために、掘削ビットを下側に突出させて成る掘削ヘッドを砂杭造成用中空管の下端に一体回転可能に取り付けて砂杭を造成する工法であって、前記中空管を回転力・押し込み力をもって地中に貫入しながら所定の深度まで掘削孔を掘削する工程と、該中空管からパイル材を前記掘削孔に排出しつつ該中空管を引き抜く工程と、該中空管の再貫入により前記パイル材を締め固める工程とを有し、前記掘削孔の掘削後に、前記掘削ヘッドの周面から締め固め部材を外側に向かってほぼ直角に突出させ、前記中空管の再貫入時に、前記締め固め部材により前記パイル材を周囲に押し付けて締め固めるようにしたものである。 The present invention will be described below with reference to preferred examples. The best mode of the present invention is a low-vibration, low-noise sand capable of increasing the penetration efficiency of a hollow pipe during excavation, effectively compacting a pile material, and creating a sand pile having an arbitrary vertical cross-sectional shape. In order to achieve the purpose of obtaining a pile building method and a sand pile building machine, a drilling head formed by projecting a drilling bit downward is attached to the lower end of a hollow pipe for sand pile formation so that the sand pile can be integrally rotated. A method of excavating a drilling hole to a predetermined depth while penetrating the hollow tube into the ground with a rotational force and a pushing force, and discharging a pile material from the hollow tube to the drilling hole. While pulling out the hollow tube and compacting the pile material by re-penetrating the hollow tube, and after the excavation of the excavation hole, the compaction member is moved outward from the peripheral surface of the excavation head. Projecting at a substantially right angle toward the Sometimes, by the compaction member is obtained as compacted against the pile material around.

本発明の砂杭造成機は、中空管の下端より下側に突出して設けられた掘削ビットと、周面より外側に向かってほぼ直角に突出し、回転しながら掘削土を側方へ移動させて締め固めする進退出可能な締め固め部材と、該締め固め部材の進退出駆動を行わせるための駆動手段とを有する中空の掘削ヘッドを有し、該掘削ヘッドを円周方向に回転自在な砂杭造成用中空管の下部に一体回転可能に取り付けたことを特徴とする。   The sand pile building machine of the present invention has a drill bit that protrudes downward from the lower end of the hollow tube, and protrudes at a right angle outward from the peripheral surface, and moves the excavated soil to the side while rotating. A hollow excavation head having a compaction member that can be advanced and retracted and a drive means for causing the compaction member to advance and retract, and the excavation head is rotatable in the circumferential direction. It is attached to the lower part of the hollow pipe for sand pile construction so that it can rotate integrally.

図１は、本発明を適用した砂杭造成機の実施例を示す。図１において、この砂杭造成工法の概略を説明すると、砂杭造成用中空管１(以下、単に「中空管１」という)の下端部には掘削ヘッド２を一体回転可能に取り付け、上方には駆動モータ（図示せず）を設置している。中空管１は、駆動モータの駆動で、掘削ヘッド２と共にその円周方向に回転され、この回転により、掘削ヘッド２の下端に設けている掘削ビット３が孔４（以下、「掘削孔４」という）を掘削する。   FIG. 1 shows an embodiment of a sand pile building machine to which the present invention is applied. In FIG. 1, the outline of the sand pile construction method will be described. A drilling head 2 is attached to a lower end portion of a sand pile construction hollow tube 1 (hereinafter simply referred to as “hollow tube 1”) so as to be integrally rotatable. A drive motor (not shown) is installed above. The hollow tube 1 is rotated in the circumferential direction together with the excavation head 2 by the drive of the drive motor, and the excavation bit 3 provided at the lower end of the excavation head 2 is rotated by a hole 4 (hereinafter referred to as “excavation hole 4”). )).

図２〜図４に示すように、掘削ヘッド２は、ヘッド本体６と掘削ビット３および締め固め部材５，５等で構成されている。ヘッド本体６の中央には、砂排出管７を設けている。そして、ヘッド本体６は、該砂排出管７が、中空管１の中心に有している砂排出路(図示せず)に連通するようにして、全体を下方に向けて、上端部が中空管１の上端に取り外し可能に取着して設けられる。   As shown in FIGS. 2 to 4, the excavation head 2 includes a head main body 6, an excavation bit 3, and compaction members 5, 5. A sand discharge pipe 7 is provided at the center of the head body 6. The head main body 6 is configured such that the sand discharge pipe 7 communicates with a sand discharge path (not shown) provided at the center of the hollow pipe 1 so that the whole is directed downward and the upper end portion is Removably attached to the upper end of the hollow tube 1 is provided.

締め固め部材５，５は、ヘッド本体６の周面で、かつ、円周方向に１８０度離れた位置に各々形成されている１対の設置孔８，８内にそれぞれ設けられている。したがって、本例では、締め固め部材５，５は掘削ヘッド２の周面に、円周方向に１８０度離れて１対設けられている。各設置孔８，８および各締め固め部材５，５は、図１および図２に示すように、正面視ほぼ真円の形状に形成されている。   The compacting members 5, 5 are respectively provided in a pair of installation holes 8, 8 formed on the peripheral surface of the head body 6 and at positions 180 degrees apart in the circumferential direction. Therefore, in this example, a pair of compaction members 5 and 5 are provided on the circumferential surface of the excavation head 2 with a 180 degree separation in the circumferential direction. As shown in FIGS. 1 and 2, each installation hole 8, 8 and each compacting member 5, 5 are formed in a substantially circular shape in front view.

各締め固め部材５，５は、前面がヘッド本体６の周面に倣った曲率面を有し、円周方向に倣うように湾曲している。なお、締め固め部材５，５の形状は、これに限定されず、必要に応じて、角形などの任意な形状に形成することができる。各締め固め部材５，５は、図示せぬ油圧駆動装置に連結している油圧シリンダ９の駆動制御により、ヘッド本体６の高さ方向に対してほぼ直角に移動できる。また、締め固め部材５，５は、ヘッド本体６の周面とほぼ同じ面になる退避位置と、ヘッド本体６の周面から大きく突出された張り出し位置との間を往復移動できるように構成されている。各油圧シリンダ９の出力部は、設置孔８，８内で、各締め固め部材５，５の基端部に連結されている。   Each of the compacting members 5, 5 has a curvature surface that follows the peripheral surface of the head body 6, and is curved so as to follow the circumferential direction. In addition, the shape of the compaction members 5 and 5 is not limited to this, It can form in arbitrary shapes, such as a square, as needed. Each of the compacting members 5 and 5 can be moved substantially at right angles to the height direction of the head body 6 by driving control of a hydraulic cylinder 9 connected to a hydraulic drive device (not shown). The compacting members 5 and 5 are configured to reciprocate between a retracted position that is substantially the same as the peripheral surface of the head main body 6 and an overhanging position that greatly protrudes from the peripheral surface of the head main body 6. ing. The output portion of each hydraulic cylinder 9 is connected to the base end portion of each compacting member 5, 5 in the installation holes 8, 8.

なお、図３および図４において、中心線の右半分は締め固め部材５，５が退避位置に配置された状態を示し、左半分は締め固め部材５，５が張り出し位置に配置された状態を示す。また、図４に点線で示す円１０は、締め固め部材５，５が張り出し位置に配置された状態で、掘削ヘッド２が回転されたときに、締め固め部材５，５が描く軌跡である。又、１１は、締め固め部材５，５の張り出し動作及び退避動作を案内するためのロッドガイドピンである。   3 and 4, the right half of the center line shows a state in which the compacting members 5 and 5 are arranged at the retracted position, and the left half shows a state in which the compacting members 5 and 5 are arranged at the overhanging position. Show. A circle 10 indicated by a dotted line in FIG. 4 is a locus drawn by the compacting members 5 and 5 when the excavation head 2 is rotated in a state where the compacting members 5 and 5 are arranged at the overhanging position. Reference numeral 11 denotes a rod guide pin for guiding the extending and retracting operations of the compacting members 5 and 5.

なお、締め固め部材５，５は、円周方向に１８０度ずれた位置に１対設けられているので、各締め固め部材５，５にかかる負荷を少なくすることができ、また１個だけ設けたものに比べ、パイル材に対する締め付けの効率が向上する。この締め固め部材５，５は、１対だけでなく、円周方向にほぼ等間隔ずつずらせて、３個以上設けてもよいものである。   Since a pair of the compacting members 5 and 5 are provided at positions shifted by 180 degrees in the circumferential direction, the load applied to each compacting member 5 and 5 can be reduced, and only one is provided. The tightening efficiency of the pile material is improved compared to the above. The compacting members 5 and 5 may be provided not only in a pair but also in a number of three or more by being shifted at equal intervals in the circumferential direction.

本実施例によれば、中空管１は、これを回転力・押し込み力によって地中に貫入しながら所定の深度まで掘削孔４を掘削する。この後、中空管１下端からパイル材を掘削孔４に排出する。又、掘削ヘッド２の周面から締め固め部材５，５を外側に向かってほぼ直角に突出させる。締め固め部材５，５を突出させた状態で、中空管１の引き抜きと再貫入を繰り返し行う。このように、締め固め部材５，５は、所定深度までの掘削・貫入工程においては、退避位置にセットされているが、この後、パイル材の絞め固め工程では突出状態にセットされる。   According to the present embodiment, the hollow tube 1 excavates the excavation hole 4 to a predetermined depth while penetrating the hollow tube 1 into the ground by a rotational force and a pushing force. Thereafter, the pile material is discharged into the excavation hole 4 from the lower end of the hollow tube 1. Further, the compacting members 5 and 5 are protruded from the peripheral surface of the excavation head 2 substantially at right angles toward the outside. With the compaction members 5 and 5 protruding, the hollow tube 1 is repeatedly pulled out and re-penetrated. As described above, the compacting members 5 and 5 are set in the retracted position in the excavation / penetration process up to a predetermined depth, but are thereafter set in the protruding state in the pile compacting process.

従って、中空管１の貫入時において、締め固め部材５，５は掘削ヘッド２の内側に収納され、掘削ヘッド２の外側に突出していないので、土中から受ける貫入抵抗が小さくなり、中空管１の貫入効率が向上する。   Therefore, when the hollow tube 1 is penetrated, the compacting members 5 and 5 are housed inside the excavation head 2 and do not protrude outside the excavation head 2, so that the penetration resistance received from the soil is reduced and the hollow tube 1 is hollow. The penetration efficiency of the tube 1 is improved.

又、中空管１の引き抜き工程及び再貫入工程では、締め固め部材５，５は掘削ヘッド２から突出する状態にセットされる。このため、掘削ヘッド２の絞め固め部分の横断面積及び体積が従来に比べ増大し、パイル材の締め固めを効果的に行うことができ、強固で高品質の締め固め砂杭を効率良く連続的に造成施工できる。   Further, in the drawing process and the re-penetrating process of the hollow tube 1, the compacting members 5, 5 are set so as to protrude from the excavation head 2. For this reason, the cross-sectional area and volume of the compacted portion of the excavation head 2 are increased compared to the conventional one, and the pile material can be compacted effectively, and a strong and high-quality compacted sand pile can be efficiently and continuously formed. Can be constructed.

尚、上記所定深度までの掘削が完了した後、掘削ヘッド２の下側より供給されるパイル材は掘削孔４内に排出して、中空管１を掘削ヘッド２と共に引き抜くが、この引き抜きでは、締め固め部材５，５を突出した状態で掘削ヘッド２と一体回転させることにより、掘削孔４の孔壁４ａは強固に締め固められる。従って、掘削孔４の孔壁４ａが崩れて狭窄状態になることもなく、砂杭を施工しながら容易に引き抜くことができる。   After the excavation to the predetermined depth is completed, the pile material supplied from the lower side of the excavation head 2 is discharged into the excavation hole 4 and the hollow tube 1 is pulled out together with the excavation head 2. The hole wall 4a of the excavation hole 4 is firmly compacted by rotating integrally with the excavation head 2 with the compacting members 5 and 5 protruding. Therefore, the hole wall 4a of the excavation hole 4 does not collapse and become a constricted state, and can be easily pulled out while constructing the sand pile.

このようにして、砂造成用中空管１の引き抜きと打ち戻し(再貫入)を繰り返して、中空管１を段階的に引き上げながら造成していくことによって、所定の径サイズに拡径された締め固め砂杭を効率良く連続造成することができる。   In this way, the hollow tube 1 for sand formation is repeatedly pulled out and driven back (re-penetrated), and the hollow tube 1 is formed while being pulled up stepwise, so that the diameter is expanded to a predetermined diameter. The compacted sand pile can be efficiently and continuously created.

更に、締め固め部材５，５の掘削ヘッド２からの突出量は自由に設定変更できる。従って、地中の深度方向に沿った任意箇所において、締め固め部材５，５の突出量を設定変更することによって、径寸法の異なる砂杭を連続造成できる。斯くして、地盤状況や設計条件等に応じて、所望の縦断面形状を有する砂杭を容易迅速に造成施工できる。   Further, the amount of projection of the compacting members 5 and 5 from the excavation head 2 can be freely changed. Therefore, sand piles having different diameters can be continuously created by changing the setting of the protruding amount of the compacting members 5 and 5 at an arbitrary location along the depth direction in the ground. Thus, sand piles having a desired vertical cross-sectional shape can be easily and quickly constructed according to the ground conditions, design conditions, and the like.

上記実施例では、締め固め部材５，５は、前面がヘッド本体６の周面に倣った曲率で、円周方向に湾曲している形状で形成したものを示したが、例えば図５に示すように、外側先端形状を半球状の曲面で形成してもよい。この場合では、掘削開始後、半球状の曲面になっているので、上下方向に移動するときの抵抗が少なくなる。したがって、掘削時に締め固め部材５，５の張り出し位置に移動させた状態で、所望の掘削を連続して行うことが可能になる。   In the above-described embodiment, the compacting members 5 and 5 are formed in a shape in which the front surface is curved in the circumferential direction with a curvature following the peripheral surface of the head body 6, for example, as shown in FIG. 5. As described above, the outer tip shape may be formed as a hemispherical curved surface. In this case, since it is a hemispherical curved surface after the start of excavation, the resistance when moving up and down is reduced. Therefore, desired excavation can be continuously performed in a state where the compacting members 5 and 5 are moved to the overhanging position during excavation.

なお、本発明は、本発明の精神を逸脱しない限り種々の改変を為すことができ、そして、本発明が該改変されたものに及ぶことは当然である。   It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

本発明の砂杭造成工法の一例を示す概念図。The conceptual diagram which shows an example of the sand pile construction method of this invention. 本発明の砂杭造成工法に使用する砂杭造成における掘削ヘッドの側面図。The side view of the excavation head in the sand pile creation used for the sand pile construction method of this invention. 図２のＡ−Ａ線概略断面図。The AA line schematic sectional drawing of FIG. 図２のＢ−Ｂ線概略断面図。BB schematic sectional drawing of FIG. 掘削ヘッドの一変形例を示す概略断面図。FIG. 6 is a schematic cross-sectional view showing a modification of the excavation head.

符号の説明Explanation of symbols

１ 砂杭造成用中空管
２ 掘削ヘッド
３ 掘削ビット
４ 掘削孔
４ａ 孔壁
５ 締め固め部材
６ ヘッド本体
７ 砂排出管
８ 設置孔
９ 油圧シリンダ
１０ 締め固め部材
１１ ロッドガイドピン

DESCRIPTION OF SYMBOLS 1 Hollow pipe for sand pile formation 2 Excavation head 3 Excavation bit 4 Excavation hole 4a Hole wall 5 Compaction member 6 Head main body 7 Sand discharge pipe 8 Installation hole 9 Hydraulic cylinder 10 Compaction member 11 Rod guide pin

Claims (6)

掘削ビットを下側に突出させて成る掘削ヘッドを砂杭造成用中空管の下端に一体回転可能に取り付けて砂杭を造成する工法であって、前記中空管を回転力・押し込み力をもって地中に貫入しながら所定の深度まで掘削孔を掘削する工程と、該中空管からパイル材を前記掘削孔に排出しつつ該中空管を引き抜く工程と、該中空管の再貫入により前記パイル材を締め固める工程とを有し、前記掘削孔の掘削後に、前記掘削ヘッドの周面から締め固め部材を外側に向かってほぼ直角に突出させ、前記中空管の再貫入時に、前記締め固め部材により前記パイル材を周囲に押し付けて締め固めるようにしたことを特徴とする砂杭造成工法。   A construction method for constructing a sand pile by attaching an excavation head having a drill bit projecting downward to a lower end of a sand pile forming hollow pipe so as to be integrally rotatable. The hollow pipe has a rotational force and a pushing force. A step of drilling a drilling hole to a predetermined depth while penetrating into the ground, a step of pulling out the hollow tube while discharging a pile material from the hollow tube to the drilling hole, and a re-penetration of the hollow tube A step of compacting the pile material, and after the excavation of the excavation hole, a compaction member protrudes from the peripheral surface of the excavation head to the outside at a substantially right angle, and when the hollow tube is re-penetrated, A sand pile construction method characterized in that the pile material is pressed against the periphery by a compacting member and compacted. ヘッド本体と、該ヘッド本体の下端部に下側に突出して設けられた掘削ビットと、掘削中に前記ヘッド本体の周面から外側に向かってほぼ直角に突出され、パイル材を側方へ押圧移動させて掘削孔の孔面を締め固めする進退出可能な締め固め部材と、該締め固め部材の進退出駆動を行わせる駆動手段とを備える中空の掘削ヘッドを、回転自在な砂杭造成用中空管の下部に一体回転可能に取り付けたことを特徴とする砂杭造成機。   A head main body, a drilling bit projecting downward from the lower end of the head main body, and projecting from the peripheral surface of the head main body to the outside at right angles during the excavation to press the pile material to the side A hollow excavation head comprising a compacting member capable of moving forward and backward for compacting the hole surface of the excavation hole and a driving means for performing forward and backward driving of the compacting member is used to create a rotatable sand pile. A sand pile generator that is attached to the lower part of the hollow tube so as to be rotatable together. 上記締め固め部材を円周方向に等間隔ずつずらせて複数個設けた請求項２記載の砂杭造成機。   3. A sand pile building machine according to claim 2, wherein a plurality of said compaction members are provided at equal intervals in the circumferential direction. 上記締め固め部材の外側先端形状を半球状の曲面で形成した請求項２または３記載の砂杭造成機。   The sand pile forming machine according to claim 2 or 3, wherein an outer front end shape of the compaction member is formed as a hemispherical curved surface. 上記掘削ヘッドを、上記中空管に対して着脱可能に取り付けた請求項２，３または４記載の砂杭造成機。   The sand pile creation machine according to claim 2, 3 or 4, wherein the excavation head is detachably attached to the hollow tube. 上記駆動手段を油圧力で駆動するようにした請求項２，３，４または５記載の砂杭造成機。





The sand pile forming machine according to claim 2, 3, 4 or 5, wherein the driving means is driven by hydraulic pressure.





JP2005195591A 2005-07-04 2005-07-04 Sand pile forming method and sand pile forming machine Pending JP2007009657A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111676961A (en) * 2020-05-16 2020-09-18 浙江新中源建设有限公司 Soft soil foundation treatment method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111676961A (en) * 2020-05-16 2020-09-18 浙江新中源建设有限公司 Soft soil foundation treatment method
CN111676961B (en) * 2020-05-16 2021-08-13 浙江新中源建设有限公司 Soft soil foundation treatment method

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