JP7295369B1 - Pile gripping claw - Google Patents

Pile gripping claw Download PDF

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JP7295369B1
JP7295369B1 JP2022115084A JP2022115084A JP7295369B1 JP 7295369 B1 JP7295369 B1 JP 7295369B1 JP 2022115084 A JP2022115084 A JP 2022115084A JP 2022115084 A JP2022115084 A JP 2022115084A JP 7295369 B1 JP7295369 B1 JP 7295369B1
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pile gripping
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充美 万代
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有限会社マンダイクレーン
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Abstract

【課題】既存杭引抜き装置に適用され、既設杭引抜作業における引抜能力の高度安定化、作業効率の向上に寄与し得る杭把持爪を提供する。【解決手段】既設杭引抜装置Zのケーシング3の先端部に配置される杭把持爪10であって、該杭把持爪10は上記ケーシング3の周壁に連結されてその先端部10bが周壁側からケーシング3の中心側に向けて下振出状態で揺動可能とされ、先端部10bのケーシング中心側の平面部には、略円錐台状のビット11、又は該ビット11を該先端部10bの幅方向に所定間隔で複数個列設固定してなるビット群12,13,14を設ける。上記杭把持爪10による既設杭9の掛止時には、該杭把持爪10の各ビット11が既設杭9側に喰い込むことで該既設杭9と杭把持爪10の間の滑りの発生が防止され、既設杭9に対する掛止性能が格段に向上し、杭引抜作業が効率良く高い信頼性のもとで行われる。【選択図】図2The object of the present invention is to provide a pile gripping claw that can be applied to an existing pile pulling device and that can contribute to high stabilization of the pulling capacity and improvement of work efficiency in the existing pile pulling operation. A pile gripping claw (10) is arranged at the tip of a casing (3) of an existing pile pulling-out device (Z), the pile gripping claw (10) is connected to the peripheral wall of the casing (3), and the tip (10b) thereof extends from the peripheral wall side. The casing 3 can be swung downward toward the center of the casing 3, and a substantially truncated cone-shaped bit 11 or the bit 11 is provided on the plane portion of the tip portion 10b on the casing center side. A plurality of bit groups 12, 13 and 14 are arranged and fixed in rows at predetermined intervals in the direction. When the existing piles 9 are hooked by the pile gripping claws 10, the bits 11 of the pile gripping claws 10 bite into the existing piles 9 to prevent slippage between the existing piles 9 and the pile gripping claws 10. As a result, the hooking performance with respect to the existing pile 9 is remarkably improved, and the pile extraction work can be performed efficiently and with high reliability. [Selection drawing] Fig. 2

Description

本願発明は、地中に埋設された既設杭を破壊することなく引き抜く既設杭引抜装置に適用される杭把持爪に関するものである。 TECHNICAL FIELD The present invention relates to a pile gripping claw applied to an existing pile extraction device for extracting an existing pile buried in the ground without destroying it.

従来から、例えば建物の建て替え工事に際して、その建物の基礎固めとして埋設されていた杭(即ち、既設杭)を破壊することなく地中から引き抜いて除去する既設杭引抜装置が提案されており、その一つに特許文献1に示される既設杭引抜装置がある。 Conventionally, there has been proposed an existing pile extraction device that extracts and removes piles (that is, existing piles) buried in the foundation of the building from the ground without destroying them, for example, when rebuilding a building. One of them is an existing pile extraction device shown in Patent Document 1.

この既設杭引抜装置は、本件出願人の出願に係るものであって、既設杭より大きい内径をもつとともにその先端部に掘削刃を備えたケーシングの下部周面に、該周面を厚さ方向に貫通して内部に張り出し可能な杭把持爪を、該ケーシングの中心を挟んで径方向に対向する二位置に、あるいは該ケーシングの中心周りに放射状に対向する三位置にそれぞれ設け、この杭把持爪をケーシング上部側に配置して駆動装置の駆動力によって、ケーシング周壁側から中心側に揺動させるように構成されている。 This existing pile extraction device relates to the application of the applicant of the present application, and has an inner diameter larger than the existing pile and is equipped with an excavating edge at the tip of the casing. Pile gripping claws that can penetrate through and protrude inside are provided at two positions facing each other in the radial direction across the center of the casing, or at three positions facing each other radially around the center of the casing, and this pile gripping The pawl is arranged on the upper side of the casing, and is configured to swing from the side of the peripheral wall of the casing to the center side by the driving force of the driving device.

既設杭の引き抜き作業時には、上記ケーシングを、上記既設杭の回りに所定隙間をもって取り囲むようにして地中に打ち込む。そして、第1の方法では、上記ケーシングを、その先端部が既設杭の先端(下端)より僅かに深くなるまで打ち込み、この状態で上記杭把持爪を、ケーシング周壁側から中心側へ張り出させ、該杭把持爪を既設杭の先端部にその下側から係止させ、この状態で上記ケーシングを引き上げることで既設杭を引き抜く方法である。 When pulling out the existing pile, the casing is driven into the ground so as to surround the existing pile with a predetermined gap. Then, in the first method, the casing is driven in until the tip thereof is slightly deeper than the tip (lower end) of the existing pile, and in this state, the pile gripping claws are protruded from the casing peripheral wall side toward the center side. In this method, the pile gripping claws are engaged with the tip of the existing pile from below, and the casing is pulled up in this state to pull out the existing pile.

また、第2の方法は、上記ケーシングを、その先端部が上記既設杭の中間の所要位置に対応する深さまで打ち込み、この状態で上記杭把持爪をケーシング周壁側から中心側へ張り出させ、該杭把持爪を上記既設杭の周面に外周側から押し当ててこれら両者間に所要の摩擦力を発生させ、この状態で上記ケーシングを引き上げることで既設杭を引き抜く方法である。 In the second method, the casing is driven into the casing to a depth corresponding to the required position in the middle of the existing pile. In this method, the pile gripping claws are pressed against the peripheral surface of the existing pile from the outer peripheral side to generate a required frictional force between them, and the existing pile is pulled out by pulling up the casing in this state.

特願2018-235893号公報Japanese Patent Application No. 2018-235893

ところが、特許文献1に示される引抜装置では、第1の方法で既設杭の引き抜きを行う場合には、上記杭把持爪の上記既設杭に対する係止効果が高いことから、別段に問題はないが、第2の方法で既設杭の引き抜きを行う場合には、上記杭把持爪を上記既設杭の外周面に強圧接触させてこれら両者間に働く摩擦力によって引抜力を確保する構成であることから、例えば、既設杭の引抜抵抗(主として、既設杭の外周面と周囲の土壌との間に作用する摩擦抵抗力)が大きくなって上記引抜力を超えると、上記既設杭の外周面と上記杭把持爪との間に滑りを生じることになる。即ち、杭周辺の土壌の性状とか、既設杭の外周面の平滑度(即ち、表面状態)によって、引抜能力が大きく左右され、安定的な引抜能力の確保が難しいという問題がある。 However, in the pull-out device shown in Patent Document 1, when the existing pile is pulled out by the first method, the effect of locking the pile gripping claws to the existing pile is high, so there is no particular problem. When the existing pile is pulled out by the second method, the above-mentioned pile gripping claws are brought into contact with the outer peripheral surface of the above-mentioned existing pile under strong pressure, and the pull-out force is ensured by the frictional force acting between them. , For example, when the pull-out resistance of the existing pile (mainly the frictional resistance acting between the outer peripheral surface of the existing pile and the surrounding soil) increases and exceeds the pull-out force, the outer peripheral surface of the existing pile and the pile Slippage will occur between the gripping claws. That is, there is a problem that it is difficult to secure a stable extraction ability because the extraction ability is greatly influenced by the properties of the soil around the pile and the smoothness (that is, the surface condition) of the outer peripheral surface of the existing pile.

そこで本願発明は、既存杭引抜き装置に適用され、既設杭引抜作業における引抜能力の高度安定化、作業効率の向上に寄与し得る杭把持爪を提供することを目的としてなされたものである。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a pile gripping claw that can be applied to an existing pile pulling device and that can contribute to highly stable pulling performance and improved work efficiency in the existing pile pulling operation.

本願発明ではかかる課題を解決するための具体的手段として次のような構成を採用している。 The present invention employs the following configuration as a specific means for solving such problems.

本願の第1の発明では、既設杭を内包するように該既設杭の外周側に打ち込まれる円筒状のケーシングの先端部において、該ケーシングの中心を挟んで径方向に対向する二位置、又は該中心から放射状に対向する三位置にそれぞれ配置される杭把持爪において、該杭把持爪は、略帯板状形体を有し、その基端部が上記ケーシングの周壁に連結されてその先端部が該周壁側から上記ケーシングの中心側に向けて下振出状態で揺動可能とされ且つ上記ケーシング側に設けた駆動手段によって揺動方向に駆動される一方、上記先端部のケーシング中心側の面は平面部とされ且つ該平面部には、略円錐台状のビット、又は該ビットを該先端部の幅方向に所定間隔で複数個列設固定してなるビット群が、上記先端部の長手方向に複数段に設けられていることを特徴としている。In the first invention of the present application, at the tip of a cylindrical casing that is driven into the outer peripheral side of the existing pile so as to enclose the existing pile, two positions that face each other in the radial direction across the center of the casing, or the The pile gripping claws are arranged at three positions radially facing each other from the center, and the pile gripping claws have a substantially band plate-like shape, the base end of which is connected to the peripheral wall of the casing, and the tip end of which is connected to the peripheral wall of the casing. It is swingable from the peripheral wall side toward the center side of the casing in a downward swung state and is driven in the swinging direction by a driving means provided on the casing side, while the surface of the tip portion on the casing center side is the surface of the casing center side. A bit having a substantially truncated cone shape, or a group of bits formed by arranging and fixing a plurality of bits in a row at predetermined intervals in the width direction of the tip portion , is arranged on the plane portion in the longitudinal direction of the tip portion. is provided in a plurality of stages .

本願の第2の発明では、上記第1の発明において、上記杭把持爪の上記平面部の少なくとも上記第1段のビット、又は第1段のビット群の周辺部分には、超硬粒子を有する補強部を設けたことを特徴としている。In a second invention of the present application, in the first invention, at least the peripheral portion of the first stage bit or the first stage bit group of the flat portion of the pile gripping claw has cemented carbide particles. It is characterized by providing a reinforcing part.

本願の第3の発明では、上記第1又は第2の発明において、上記杭把持爪の先端面を凹状曲面としたことを特徴としている。 A third invention of the present application is characterized in that, in the first or second invention, the tip end surface of the pile gripping claw is a concave curved surface.

(a)本願の第1の発明
本願の第1の発明に係る杭把持爪によれば、該杭把持爪の先端部に、略円錐台状のビット、又は該ビットを該先端部の幅方向に所定間隔で複数個列設固定してなるビット群が、上記先端部の長手方向に複数段に設けられていることから、該杭把持爪を用いて既設杭の中段部を把持する場合、該ビット、又はビット群の各ビットが既設杭の外周面に喰い込んで係止作用をなすことから、該既設杭の外周面と上記杭把持爪との間に滑りが生じるのが防止され、その結果、上記既設杭と上記杭把持爪の間に作用する摩擦力と、上記杭把持爪のビットによる係止力との相乗効果によって、上記既設杭に対して高い引抜力が付与され、既設杭引抜装置の既設杭に対する引抜能力が格段に向上するとともに、引抜作業の信頼性が向上することになる。
また、上記ビット、又は上記ビット群を、上記先端部の長手方向に複数段に設けたことから、該ビットによる係止作用及び滑り止め作用がさらに向上し、上記効果がより一層確実ならしめられる。
(a) First invention of the present application According to the pile gripping claw according to the first invention of the present application, a substantially truncated cone-shaped bit or the bit is placed at the tip of the pile gripping claw in the width direction of the tip A group of bits arranged and fixed in a row at predetermined intervals is provided in a plurality of stages in the longitudinal direction of the tip part . Since the bit or each bit of the bit group bites into the outer peripheral surface of the existing pile to perform a locking action, slippage between the outer peripheral surface of the existing pile and the pile gripping claw is prevented, As a result, a synergistic effect between the frictional force acting between the existing pile and the pile gripping claw and the locking force of the bit of the pile gripping claw imparts a high pull-out force to the existing pile. The pull-out capability of the pile pull-out device for existing piles is greatly improved, and the reliability of the pull-out work is improved.
In addition, since the bit or the bit group is provided in a plurality of stages in the longitudinal direction of the tip portion, the locking action and anti-slip action of the bit are further improved, and the above effects are further ensured. .

(b)本願の第2の発明
本願の第2の発明では、上記第1の発明において、上記杭把持爪の上記平面部の少なくとも上記第1段のビット、又は第1段のビット群の周辺部分、即ち、最も負荷が掛かり易い部分に、超硬粒子を有する補強部を設けたことから、該各ビットの強度上の信頼性が向上し、延いては上記(a)に記載の効果がより一層顕著となる。
(b) Second invention of the present application In the second invention of the present application, in the first invention, at least the first stage bit of the flat portion of the pile gripping claw, or the periphery of the first stage bit group Since the reinforcing portion having the cemented carbide particles is provided in the portion, that is, the portion where the load is most likely to be applied, the reliability of the strength of each bit is improved, and the effect described in (a) above is obtained. becomes even more pronounced.

(c)本願の第3の発明
本願の第3の発明では、上記第1又は第2の発明において、上記杭把持爪の先端面を凹状曲面としたので、該杭把持爪の先端面が上記既設杭の外周面に当接して上記各ビットの上記既設杭側への食い付きが阻害されるということが未然に防止され、延いては上記杭把持爪を使用しての既設杭引抜作業の信頼性が確保される。
(c) Third invention of the present application In the third invention of the present application, in the first or second invention, the tip surface of the pile gripping claw is a concave curved surface. Abutment on the outer peripheral surface of the existing pile prevents the bits from biting into the existing pile, which in turn prevents the existing pile from being pulled out using the pile gripping claws. Reliability is ensured.

本願発明に係る杭把持爪が適用された既設杭引抜装置の全体外観図である。 1 is an overall external view of an existing pile pulling-out device to which pile gripping claws according to the present invention are applied; FIG. 本願発明の実施形態に係る杭把持爪の全体斜視図である。 1 is an overall perspective view of a pile gripping claw according to an embodiment of the present invention; FIG. 上記杭把持爪の先端部の正面図である。 It is a front view of the front-end|tip part of the said pile holding nail|claw. 図3のA-A断面図である。 FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3; 既設杭の外周面への杭把持爪の当接初期状態の平面図である。 FIG. 10 is a plan view of the initial state of contact of the pile gripping claws with the outer peripheral surface of the existing pile. 図6のB-B矢視図である。 FIG. 7 is a view taken along line BB in FIG. 6; 上記既設杭引抜装置の非作業時における杭把持爪の格納状態説明図である。 FIG. 5 is an explanatory diagram of a storage state of the pile gripping claws when the existing pile pulling-out device is not working. 既設杭の先端部をその下方側から支持した状態での杭引抜作業の説明図である。 FIG. 10 is an explanatory diagram of the pile extraction work in a state where the tip of the existing pile is supported from below; 既設杭の中段部を杭把持爪によって挟持した状態での杭引抜作業の説明図である。 FIG. 10 is an explanatory diagram of a pile pulling-out operation in a state in which a middle step portion of an existing pile is clamped by pile gripping claws;

以下、本願発明に係る杭把持爪を、既設杭引抜装置Zに装備された実施形態として説明する。 Hereinafter, an embodiment in which an existing pile pulling-out device Z is equipped with pile gripping claws according to the present invention will be described.

図1には、本願発明に係る杭把持爪10が装着されて既設杭9の引抜作業に供せられる既設杭引抜装置Zを示している。この既設杭引抜装置Zは、リーダ等の支持基台に吊下支持されるアースオーガ1の下側にスイベルジョイント2を介してケーシング3を連結して構成される。 FIG. 1 shows an existing pile extracting device Z to which the pile gripping claws 10 according to the present invention are attached and which is used for extracting the existing pile 9 . This existing pile extraction device Z is constructed by connecting a casing 3 via a swivel joint 2 to the lower side of an earth auger 1 suspended from a support base such as a leader.

上記ケーシング3は、引抜対象の既設杭よりも所定寸法だけ大きい内径寸法(例えば、500mm~600mm程度)を有する管体で構成されるもので、所定長さの分割管体を所要長さとなるように軸方向に適宜連結一体化して構成され、その際上端の分割管体の上端部が上記スイベルジョイント2の下側に連結される。 The casing 3 is composed of a tubular body having an inner diameter dimension (for example, about 500 mm to 600 mm) larger than that of the existing pile to be pulled out by a predetermined dimension. , and the upper end of the split pipe body at the upper end is connected to the lower side of the swivel joint 2 .

そして、このケーシング3は、上記アースオーガ1により回転させられながら、既設杭9を内包した状態でこれに沿って土中に打ち込まれて該既設杭9の周囲の土壌を縁切りするものである。そして、該ケーシング3の下端部には、図7にも示すように、下端周壁に取り付けられた複数の先端掘削刃6と、下端外周よりも径方向外側に突出状態で取り付けられた複数の外側掘削刃7が備えられている。 The casing 3 is driven into the soil along the existing piles 9 while being rotated by the earth auger 1 to cut off the soil surrounding the existing piles 9 . At the lower end of the casing 3, as shown in FIG. 7, a plurality of tip excavating blades 6 attached to the peripheral wall of the lower end and a plurality of outer edges protruding radially outward from the outer periphery of the lower end. A digging edge 7 is provided.

そして、上記各先端掘削刃6によって上記既設杭9の外周に接した土壌が該外周から適宜離間した位置で切断され、縁切りが行われる。さらに、上記縁切り部分の外側部分が上記複数の外側掘削刃7によって所定幅の円環状に掘削され、該下部ケーシング13の下端外周に設けられた爪カバー16の進行隙間が形成される。 Then, the soil in contact with the outer circumference of the existing pile 9 is cut by the tip excavating blades 6 at a position appropriately spaced from the outer circumference, and edge cutting is performed. Further, the outer portion of the edge cut portion is excavated in an annular shape having a predetermined width by the plurality of outer excavating blades 7 to form an advancing clearance of the claw cover 16 provided on the outer periphery of the lower end of the lower casing 13 .

さらに、上記ケーシング3には、該ケーシング3を既設杭9の周囲に打ち込んだ後、該既設杭9を該ケーシング3側に掛止させて該ケーシング3と共に上記既設杭9を引き上げる(引き抜く)ために、次述する本願発明の要旨たる杭把持爪10を備えて構成される掛止機構5が設けられている。 Furthermore, after driving the casing 3 around the existing piles 9, the existing piles 9 are hooked to the casing 3 side, and the existing piles 9 are pulled up (pulled out) together with the casing 3. , is provided with a hooking mechanism 5 comprising pile gripping claws 10, which is the gist of the present invention described below.

上記掛止機構5は、図7~図9にも示されるように、本発明の要旨たる後述の杭把持爪10を備えて構成される。 As shown in FIGS. 7 to 9, the locking mechanism 5 is provided with pile gripping claws 10, which are the gist of the present invention and will be described later.

ここで、上記杭把持爪10の構造等を説明する。この杭把持爪10は、図2~図4に示すように、所定厚さ及び所定幅の帯状体で一体形成され、その基端部10aには幅方向に延びる軸孔10fが設けられている。また、その先端部10bは平坦面とされ、ここには超高材で円錐台状に形成された複数個のビット11が、その先端を平坦面から上方へ所定高さだけ突出させた状態で、最も先端面寄り位置には杭把持爪10の幅方向に所定間隔で4個(これらを第1ビット群12という)、その上側(基端部10a寄り側)には幅方向に所定間隔で3個(これを第2ビット群13という)、さらにその上側には幅方向に所定間隔で4個(これを第3ビット群14という)がそれぞれ設けられている。 Here, the structure and the like of the pile gripping claw 10 will be described. As shown in FIGS. 2 to 4, the pile gripping claw 10 is integrally formed of a belt-like body having a predetermined thickness and a predetermined width, and a shaft hole 10f extending in the width direction is provided at the base end 10a. . The tip portion 10b is formed into a flat surface, and a plurality of bits 11 made of super-high material and formed in a truncated cone shape are projected upward from the flat surface by a predetermined height. , 4 pieces (these are referred to as the first bit group 12) in the width direction of the pile gripping claw 10 at the position closest to the tip surface, and on the upper side (closer to the base end 10a) at a predetermined interval in the width direction Three bits (this is referred to as the second bit group 13) and four bits (this is referred to as the third bit group 14) are provided at predetermined intervals in the width direction on the upper side thereof.

また、上記杭把持爪10の先端面10eは、基端部10a側に凹入する凹状曲面とし、該杭把持爪10がケーシング3の中心寄りに揺動してその先端面10eが既設杭9の外周面9aに接近する場合における過度の干渉を防止し、上記各ビット11の上記既設杭9の外周面9aへの喰い込み性能を確保している。 Further, the tip surface 10e of the pile gripping claw 10 is formed as a concave curved surface recessed toward the base end portion 10a side, and the pile gripping claw 10 swings toward the center of the casing 3 so that the tip surface 10e of the pile gripping claw 10 moves toward the existing pile 9. Excessive interference when approaching the outer peripheral surface 9a of the pile 9 is prevented, and the biting performance of the bits 11 into the outer peripheral surface 9a of the existing pile 9 is ensured.

さらに、図2及び図3に示すように、上記杭把持爪10の第1ビット群12の各ビット11の周辺部分には、超硬粒子を有する補強部が設けられている。 Further, as shown in FIGS. 2 and 3, the peripheral portion of each bit 11 of the first bit group 12 of the pile gripping claw 10 is provided with a reinforcing portion having cemented carbide particles.

以上のように構成された上記杭把持爪10の既設杭引抜装置Zへの組み込み状態が、図7~図9に示されている。この実施形態では、上記杭把持爪10は、上記ケーシング3の中心を挟んで径方向に対向する二位置において、上記ケーシング3の周壁部分に形成された上記爪カバー16内に、その先端部10bを下側にし、且つ上記各ビット11の配置側の面をケーシング中心側に指向させた状態で配置されるとともに、その基端部10aが連結ピン31によって上記伝動材8の下端部に枢支されている。 7 to 9 show how the pile gripping claw 10 constructed as described above is assembled into the existing pile pulling-out device Z. FIG. In this embodiment, the pile gripping claws 10 are provided in the claw covers 16 formed on the peripheral wall portion of the casing 3 at two positions facing each other in the radial direction with the center of the casing 3 interposed therebetween. , and the surfaces on which the bits 11 are arranged are oriented toward the center of the casing. It is

したがって、上記杭把持爪10は、上記ケーシング3の上端部に配置された油圧シリンダ等の駆動部4の駆動力が上記ケーシング3に沿って配置した伝動材8を介して伝達されることで上下方向(U-D方向)に移動されると同時に、該杭把持爪10の裏面側に形成されたカム受面33が上記爪カバー16の下方側に配置されたカム32と摺接係合することで、該杭把持爪10は上記連結ピン31を中心として下振出状態で上記ケーシング3の中心に接離する方向(F-R方向)に駆動される。 Therefore, the pile gripping claws 10 can be vertically moved by transmitting the driving force of the driving part 4 such as the hydraulic cylinder arranged at the upper end of the casing 3 through the transmission material 8 arranged along the casing 3 . At the same time as the pile gripping claw 10 is moved in the direction (UD direction), the cam receiving surface 33 formed on the back side of the pile gripping claw 10 engages with the cam 32 arranged on the lower side of the claw cover 16 in sliding contact. As a result, the pile gripping claws 10 are driven in a direction (FR direction) toward and away from the center of the casing 3 in a downward swung state about the connecting pin 31 .

そして、図7に示す状態が、上記ケーシング3の上記既設杭9の外周側への打ち込み作業の状態であって、この状態においては、上記左右一対の杭把持爪10は共に上記爪カバー16側に格納され、該ケーシング3の内周側への突出量が最小とされ、該ケーシング3の打ち込みが良好に行われる状態である。 The state shown in FIG. 7 is a state in which the casing 3 is driven into the outer peripheral side of the existing pile 9. In this state, the pair of left and right pile gripping claws 10 are both on the claw cover 16 side. , the amount of protrusion of the casing 3 toward the inner circumference is minimized, and the casing 3 can be driven well.

図8に示す状態は、上記ケーシング3を上記既設杭9の先端部9bよりも下方まで打ち込んで、該既設杭9をその下端部の下側から抱持状態で支持し、該ケーシング3の引き上げとともに該既設杭9を引き抜く作業状態である。この場合には、上記各杭把持爪10は大きくケーシング中心側に振り出されて、該各杭把持爪10に設けた上記ビット11が上記既設杭9の下端部9bに喰い込んでこれら両者間の滑りを抑えた状態で、該各杭把持爪10を該既設杭9の下端部9bに掛止させた状態である。In the state shown in FIG. 8, the casing 3 is driven into the existing pile 9 below the tip portion 9b, the existing pile 9 is supported from below the lower end portion in an embraced state, and the casing 3 is pulled up. Together with , the existing pile 9 is pulled out. In this case, the pile gripping claws 10 are swung largely toward the center of the casing, and the bits 11 provided on the pile gripping claws 10 bite into the lower end portions 9b of the existing piles 9 to prevent the gap between them. The pile gripping claws 10 are hooked to the lower end portions 9b of the existing piles 9 while the slippage of the piles 9 is suppressed.

この時、上記杭把持爪10の各ビット11のうち、最初に第3ビット群14の各ビット11のうち、列設方向の内側に位置する2個のビット11が既設杭9の先端部9bに当接するため、例えば、他のビット群のビット11も同時に接触する場合に比して、ビット11の先端における接触面圧が大きく、該ビット11は滑りを生じることなく容易且つ確実に既設杭9の下端部9bに喰い込むことになる。この結果、上記掛止機構5による上記既設杭9に対する掛止性能が格段に向上し、上記既設杭9の引抜作業が効率良く高い信頼性の下で行われる。 At this time, among the bits 11 of the pile gripping claws 10, among the bits 11 of the third bit group 14, the two bits 11 positioned inside in the line-up direction first move toward the tip portion 9b of the existing pile 9. Therefore, the contact surface pressure at the tip of the bit 11 is greater than when the bits 11 of other bit groups are also in contact at the same time, and the bit 11 easily and reliably attaches to the existing pile without causing slippage. It bites into the lower end portion 9b of 9. As a result, the hooking performance of the hooking mechanism 5 on the existing pile 9 is significantly improved, and the work of pulling out the existing pile 9 is performed efficiently and with high reliability.

図9に示す状態は、上記ケーシング3を上記既設杭9の中段位置まで打ち込んで、上記掛止機構5の各杭把持爪10によって上既設杭9の中段部を掛止してこれを引き抜く作業状態を示している。この状態においては、上記各杭把持爪10の揺動角度が小さいので、特に上記既設杭9の滑りが発生し易い状態である。 In the state shown in FIG. 9, the casing 3 is driven into the middle position of the existing pile 9, the middle part of the upper existing pile 9 is locked by the pile gripping claws 10 of the locking mechanism 5, and pulled out. state. In this state, since the swinging angle of each of the pile gripping claws 10 is small, the existing piles 9 are particularly prone to slip.

しかし、この実施形態のものでは、上記既設杭9の外周面9aに上記杭把持爪10の各ビット11が当接する場合、上記各ビット群の各ビット11が同時に当接するのではなく、第1ビット群12の列設方向中央の2個のビット11が最初に当接するので、例えば、他のビット11も同時に当接する場合に比して、ビット11の接触面圧が大きく、該ビット11は滑りを生じることなく容易且つ確実に既設杭9の外周面9aに喰い込むことになる。この結果、上記掛止機構5による上記既設杭9に対する掛止性能が格段に向上し、上記既設杭9の外周面9aを掛止しての杭引抜作業であるにも拘わらず、上記既設杭9の引抜作業が効率良く高い信頼性の下で行われる。 However, in this embodiment, when the bits 11 of the pile gripping claws 10 come into contact with the outer peripheral surface 9a of the existing pile 9, the bits 11 of the respective bit groups do not come into contact at the same time. Since the two bits 11 at the center of the bit group 12 are brought into contact first, the contact surface pressure of the bits 11 is greater than when the other bits 11 are also brought into contact at the same time. It easily and surely bites into the outer peripheral surface 9a of the existing pile 9 without causing slippage. As a result, the hooking performance for the existing pile 9 by the hooking mechanism 5 is remarkably improved, and the existing pile can be pulled out even though the outer peripheral surface 9a of the existing pile 9 is hooked. 9 is performed efficiently and with high reliability.

本願発明に係る杭把持爪は、既設杭の引抜装置に広く利用できるものである。 INDUSTRIAL APPLICABILITY The pile gripping claw according to the present invention can be widely used in an existing pile extraction device.

1 ・・アースオーガ
2 ・・スイベルジョイント
3 ・・ケーシング
4 ・・駆動部
5 ・・掛止機構
6 ・・先端掘削爪
7 ・・外側掘削爪
8 ・・伝動材
9 ・・既設杭
10 ・・杭把持爪
11 ・・ビット
12 ・・第1ビット群
13 ・・第2ビット群
14 ・・第3ビット群
15 ・・補強部
16 ・・爪カバー
31 ・・連結ピン
32 ・・カム
33 ・・カム受面
Z ・・既設杭引抜装置
REFERENCE SIGNS LIST 1 Earth auger 2 Swivel joint 3 Casing 4 Drive unit 5 Locking mechanism 6 Tip excavation claw 7 Outer excavation claw 8 Transmission material 9 Existing pile 10 Pile gripping claw 11 Bit 12 First bit group 13 Second bit group 14 Third bit group 15 Reinforcing portion 16 Claw cover 31 Connecting pin 32 Cam 33 Cam receiving surface Z ・・・Existing pile extraction device

Claims (3)

既設杭を内包するように該既設杭の外周側に打ち込まれる円筒状のケーシングの先端部において、該ケーシングの中心を挟んで径方向に対向する二位置、又は該中心から放射状に対向する三位置にそれぞれ配置される杭把持爪であって、
該杭把持爪は、略帯板状形体を有し、その基端部が上記ケーシングの周壁に連結されてその先端部が該周壁側から上記ケーシングの中心側に向けて下振出状態で揺動可能とされ且つ上記ケーシング側に設けた駆動手段によって揺動方向に駆動される一方、
上記先端部のケーシング中心側の面は平面部とされ且つ該平面部には、略円錐台状のビット、又は該ビットを該先端部の幅方向に所定間隔で複数個列設固定してなるビット群が、上記先端部の長手方向に複数段に設けられていることを特徴とする杭把持爪。
At the tip of a cylindrical casing that is driven into the outer peripheral side of the existing pile so as to enclose the existing pile, two positions that face each other in the radial direction across the center of the casing, or three positions that face each other radially from the center pile gripping claws respectively arranged in
The pile gripping claw has a substantially band plate-like shape, the base end of which is connected to the peripheral wall of the casing, and the tip end of which swings downward from the peripheral wall toward the center of the casing. and driven in the swinging direction by drive means provided on the casing side,
The surface of the tip portion facing the center of the casing is a flat portion, and on the flat portion, a substantially truncated cone-shaped bit or a plurality of such bits are arranged and fixed at predetermined intervals in the width direction of the tip portion. A pile gripping claw , wherein a group of bits are provided in a plurality of stages in the longitudinal direction of the tip portion .
請求項1において、
上記杭把持爪の上記平面部の少なくとも上記第1段のビット、又は第1段のビット群の周辺部分には、超硬粒子を有する補強部が設けられていることを特徴とする杭把持爪。
In claim 1 ,
A pile gripping claw characterized in that a reinforcing portion containing cemented carbide particles is provided on at least the peripheral portion of the first stage bit or the first stage bit group of the flat portion of the pile gripping claw. .
請求項1又は2において、
上記杭把持爪の先端面は凹状曲面とされていることを特徴とする杭把持爪。
In claim 1 or 2 ,
The pile gripping claw is characterized in that the tip end surface of the pile gripping claw is formed into a concave curved surface.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009127243A (en) 2007-11-21 2009-06-11 Mandai Crane:Kk Extraction equipment for buried pile
JP2019194422A (en) 2018-04-27 2019-11-07 有限会社マンダイクレーン Pulling device for existing pile
JP2021038545A (en) 2019-09-02 2021-03-11 アロイ工業株式会社 Casing bit and casing pipe tip structure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5927250U (en) * 1982-08-16 1984-02-20 山本 盛吉 Steel sheet pile clamping device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009127243A (en) 2007-11-21 2009-06-11 Mandai Crane:Kk Extraction equipment for buried pile
JP2019194422A (en) 2018-04-27 2019-11-07 有限会社マンダイクレーン Pulling device for existing pile
JP2021038545A (en) 2019-09-02 2021-03-11 アロイ工業株式会社 Casing bit and casing pipe tip structure

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