JP2017031568A - Press-in method for tubular pile, and connection structure between driving-down device and tubular pile - Google Patents

Press-in method for tubular pile, and connection structure between driving-down device and tubular pile Download PDF

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JP2017031568A
JP2017031568A JP2015149518A JP2015149518A JP2017031568A JP 2017031568 A JP2017031568 A JP 2017031568A JP 2015149518 A JP2015149518 A JP 2015149518A JP 2015149518 A JP2015149518 A JP 2015149518A JP 2017031568 A JP2017031568 A JP 2017031568A
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tubular pile
press
pile
lowering device
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JP6580894B2 (en
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北村　精男
Morio Kitamura
北村　　精男
大野　正明
Masaaki Ono
正明 大野
村田　敏彦
Toshihiko Murata
敏彦 村田
吉智 川村
Yoshitomo Kawamura
吉智 川村
高橋　渉
Wataru Takahashi
渉 高橋
悟史 上村
Satoshi Kamimura
悟史 上村
濱口　貴和
Takakazu Hamaguchi
貴和 濱口
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Giken Seisakusho Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To enable pressing-in of a tubular pile into a ground by a method utilizing both a driving-down device and a fluid discharging method, without halting a supply of the fluid.SOLUTION: The following steps are performed sequentially in a press-in method for a tubular pile: a first step in which a clamp device 41 is inserted and connected to a top edge part of a new tubular pile 20 and fluid supply piping 15 is installed through inside of a driving-down device 40, the clamp device being connection means at a lower edge part of the driving-down device having a cylindrical body; a second step in which the new tubular pile and the driving-down device are hoisted and erected while holding the new tubular pile with a chuck device of a pile press-in machine; and a third step in which the pile press-in machine is operated while discharging a fluid through the fluid supply piping onto a ground that resists pressing-in of a tip part of the new tubular pile, and the new tubular pile is driven down for pressing into the ground until the driving-down device is lowered to the gripping position by the chuck device.SELECTED DRAWING: Figure 6

Description

本発明は、管状杭の圧入方法、及び打ち下げ装置と管状杭との接続構造に関する。   The present invention relates to a method for press-fitting a tubular pile, and a connection structure between a driving device and a tubular pile.

従来、管状杭を杭圧入機で圧入する場合、対象となる杭を計画レベルまで打ち下げるために、打ち下げ装置が用いられる場合がある（非特許文献１）。
杭圧入機は、管状杭の上端部を把持するクランプ装置と、管状杭を把持するチャック装置と、チャック装置をクランプ装置に対して昇降させる昇降機構とを備えて構成される。
このような杭圧入機は、地盤に圧入された既設の管状杭をクランプ装置で把持して当該既設の管状杭から反力を取り、新たな管状杭をチャック装置で把持して地盤に圧入する。
この圧入される新たな管状杭の上端部に、円筒状の本体を有した打ち下げ装置の下端部を挿し込んだ状態で接続することで、圧入される新たな管状杭の上端が延長されたような形態とする。その上で、上記昇降機構とチャック装置との共働により、新たな管状杭の上端をチャック装置の把持位置より下に打ち下げて、チャック装置で打ち下げ装置を把持しさらに打ち下げることができる。
このような打ち下げ装置を用いた管状杭の圧入方法は、チャック装置の上下ストロークの下死点より下に杭を打ち下げることを可能とする。
また、打ち下げ装置は管状杭の上端部に挿し込まれ、管状杭の上端部がチャック装置の把持力により径方向に潰れるように変形することを抑える。したがって、チャック装置の把持位置が管状杭の上端部までで杭圧入が終わる場合にも、管状杭の上端部に打ち下げ装置を接続することで、管状杭の上端部の変形を抑えて管状杭を地盤に圧入することができる。 Conventionally, when a tubular pile is press-fitted with a pile press-in machine, a lowering device may be used to lower the target pile to a planned level (Non-Patent Document 1).
The pile press-in machine includes a clamp device that holds the upper end portion of the tubular pile, a chuck device that holds the tubular pile, and a lifting mechanism that moves the chuck device up and down relative to the clamp device.
Such a pile press-in machine grips an existing tubular pile press-fitted into the ground with a clamping device, takes a reaction force from the existing tubular pile, and grips a new tubular pile with a chuck device and press-fits it into the ground. .
The upper end of the new tubular pile to be press-fitted is connected to the upper end of the new tubular pile to be press-fitted and connected in a state where the lower end of the lowering device having a cylindrical body is inserted. The form is as follows. In addition, by cooperation of the lifting mechanism and the chuck device, the upper end of the new tubular pile can be lowered below the gripping position of the chuck device, and the lowering device can be gripped and further lowered by the chuck device. .
The method of press-fitting a tubular pile using such a lowering device makes it possible to lower the pile below the bottom dead center of the vertical stroke of the chuck device.
Moreover, the lowering device is inserted into the upper end portion of the tubular pile, and the upper end portion of the tubular pile is prevented from being deformed so as to be crushed in the radial direction by the gripping force of the chuck device. Therefore, even when the gripping position of the chuck device is up to the upper end of the tubular pile and the pile press-in is finished, by connecting the lowering device to the upper end of the tubular pile, the deformation of the upper end of the tubular pile can be suppressed and the tubular pile Can be pressed into the ground.

一方で、例えば特許文献１にも記載されるように、管状杭圧入時の圧入抵抗を抑える補助工法として、流体供給配管を通して流体物(水・エアー・発泡液等)を圧入される新たな管状杭の先端部の圧入に抗する地盤に吐出しながら杭圧入機を動作させて地盤に圧入する方法が利用されている。
以上の打ち下げ装置と流体物吐出工法とを併用して管状杭を回転圧入する場合、予め、流体物供給装置からのホースと、管状杭の内側に設けられた配管とを接続・離脱可能に構成した上で以下のように行っていた。
まず、流体物供給装置からのホースを圧入される新たな管状杭の内側に設けられた配管に接続するとともに、ホースを水平回転自在に設けるためのスイベルジョイントを同管状杭の上端上に設置する。
次に、当該管状杭を一定の深さまで圧入する。
続いて、当該管状杭からホースを一旦取り外し、打ち下げ装置を当該管状杭の上端に接続する。ホースを打ち下げ装置の内部を通して管状杭の内側に設けられた配管に接続するとともに、スイベルジョイントを打ち下げ装置の上端上に設置する。
次に、当該管状杭を計画レベルまで打ち下げる。 On the other hand, as described in Patent Document 1, for example, as an auxiliary method for suppressing the press-fitting resistance at the time of press-fitting a tubular pile, a new tubular member into which a fluid (water, air, foamed liquid, etc.) is press-fitted through a fluid supply pipe A method is used in which a pile press-in machine is operated and pressed into the ground while discharging into the ground that resists the press-fit of the tip of the pile.
When the tubular pile is rotationally press-fitted using both the above-mentioned dropping device and the fluid discharge method, the hose from the fluid supply device and the piping provided inside the tubular pile can be connected and disconnected in advance. After the configuration, it was performed as follows.
First, a hose from the fluid supply device is connected to a pipe provided inside a new tubular pile to be press-fitted, and a swivel joint is provided on the upper end of the tubular pile for horizontally rotating the hose. .
Next, the tubular pile is press-fitted to a certain depth.
Subsequently, the hose is once removed from the tubular pile, and the lowering device is connected to the upper end of the tubular pile. The hose is connected to the pipe provided inside the tubular pile through the inside of the lowering device, and the swivel joint is installed on the upper end of the lowering device.
Next, the tubular pile is pushed down to the planned level.

特開２００５−１２７０９５号公報JP 2005-127095 A

ジャイロプレス工法（http://www.giken.com/files/ja/press-in/Press-in_Gyropress_JPA_ver036ja04.pdf）Gyro press method (http://www.giken.com/files/ja/press-in/Press-in_Gyropress_JPA_ver036ja04.pdf)

しかし、以上の打ち下げ装置と流体物吐出工法とを併用した手順によれば、打ち下げ装置を管状杭の上端部に接続する際に、流体物を供給するホースを一旦取り外して再び接続する必要がある。
したがって、流体物の供給を一時的に停止させる必要が生じるため、その間に圧入対象となる地盤が締め固まってしまい、圧入再開後の貫入抵抗の増大、ひいては圧入時間を増大させる要因となっているという問題がある。
また、場合によっては、流体物の供給を一時的に停止させることにより、流体物を吐出する先端ノズルが砂・泥等で詰まってしまい、圧入不能になるおそれもある。圧入不能となった場合は、一旦杭を引き抜き、先端ノズルの詰まりを除去した後、再度圧入施工を実施する必要が生じる。 However, according to the procedure using the above-described driving device and the fluid discharge method together, when connecting the driving device to the upper end of the tubular pile, it is necessary to remove and reconnect the hose that supplies the fluid. There is.
Accordingly, since it is necessary to temporarily stop the supply of the fluid, the ground to be press-fitted becomes solidified during that time, which increases the penetration resistance after resuming the press-fitting, and thus increases the press-fitting time. There is a problem.
In some cases, the supply of fluid is temporarily stopped, and the tip nozzle that discharges the fluid may be clogged with sand, mud, or the like, and may not be press-fit. When press-fit becomes impossible, it is necessary to pull out the pile once and remove the clogging of the tip nozzle, and then press-fit again.

本発明は以上の従来技術における問題に鑑みてなされたものであって、打ち下げ装置と流体物吐出工法とを併用した管状杭の地盤への圧入施工を、流体物の供給を停止させることなく実施可能にすることを課題とする。   The present invention has been made in view of the above-described problems in the prior art, and the press-fitting construction of the tubular pile to the ground using the driving device and the fluid discharge method is used without stopping the supply of the fluid. The issue is to enable implementation.

以上の課題を解決するための請求項１記載の発明は、管状杭の上端部を把持するクランプ装置と、管状杭を把持するチャック装置と、前記チャック装置を前記クランプ装置に対して昇降させる昇降機構とを備えた杭圧入機を用いて、地盤に圧入された既設の管状杭を前記クランプ装置で把持して当該既設の管状杭から反力を取り、新たな管状杭を前記チャック装置で把持して地盤に圧入する管状杭の圧入方法であって、
前記新たな管状杭の上端部に、円筒状の本体を有した打ち下げ装置の下端部を挿し込んだ状態で接続手段により接続するととともに、流体物供給配管を前記打ち下げ装置の内部を通して設置する第１工程と、
前記新たな管状杭及び前記打ち下げ装置を吊り上げ、前記新たな管状杭を前記チャック装置に把持させた状態に建て込む第２工程と、
前記流体供給配管を通して流体物を前記新たな管状杭の先端部の圧入に抗する地盤に吐出しながら前記杭圧入機を動作させ、前記チャック装置の把持位置に前記打ち下げ装置が下がるまで前記新たな管状杭を打ち下げて地盤に圧入する第３工程と、を以上の記載の順序で備える管状杭の圧入方法である。 The invention according to claim 1 for solving the above-described problems is a clamp device for gripping an upper end portion of a tubular pile, a chuck device for gripping a tubular pile, and a lift for moving the chuck device up and down relative to the clamp device. The existing tubular pile press-fitted into the ground is gripped by the clamp device using the pile press-fitting machine equipped with a mechanism, the reaction force is taken from the existing tubular pile, and the new tubular pile is gripped by the chuck device. And then press-fitting the tubular pile into the ground,
The upper end of the new tubular pile is connected by connecting means in a state where the lower end of the lowering device having a cylindrical body is inserted, and the fluid supply pipe is installed through the inside of the lowering device. The first step;
A second step of lifting the new tubular pile and the lowering device, and building the new tubular pile in a state of being gripped by the chuck device;
The pile press-in machine is operated while discharging the fluid through the fluid supply pipe to the ground that resists the press-fitting of the tip of the new tubular pile, and the new push-down device is lowered until the lowering device is lowered to the gripping position of the chuck device. A tubular pile press-in method comprising a third step of pushing down a tubular pile and press-fitting it into the ground in the order described above.

請求項２記載の発明は、前記第２工程の吊り上げ時おいて、吊ワイヤーを前記新たな管状杭の外周面に固設された連結部にのみ連結して、前記打ち下げ装置を前記新たな管状杭による下支えのみによって支持する請求項１に記載の管状杭の圧入方法である。   The invention according to claim 2 is that when the second step is lifted, the hanging wire is connected only to a connecting portion fixed to the outer peripheral surface of the new tubular pile, and the driving device is moved to the new step. It is the press-in method of the tubular pile of Claim 1 supported only by the lower support by a tubular pile.

請求項３記載の発明は、前記第２工程の吊り上げ時おいて、吊ワイヤーを前記打ち下げ装置に設けられた連結部にのみ連結して、前記新たな管状杭を前記接続手段のみによって支持する請求項１に記載の管状杭の圧入方法である。   According to a third aspect of the present invention, at the time of lifting in the second step, the hanging wire is connected only to the connecting portion provided in the dropping device, and the new tubular pile is supported only by the connecting means. A method for press-fitting a tubular pile according to claim 1.

請求項４記載の発明は、前記第２工程の吊り上げ時おいて、吊ワイヤーを前記打ち下げ装置に設けられた連結部にのみ連結するとともに、前記打ち下げ装置と前記新たな管状杭とを別ワイヤーにより連結して、前記別ワイヤーを、前記新たな管状杭が前記打ち下げ装置から分離しないように作用させる請求項１に記載の管状杭の圧入方法である。   According to a fourth aspect of the present invention, at the time of lifting in the second step, the suspension wire is connected only to a connecting portion provided in the lowering device, and the lowering device and the new tubular pile are separated. It is the press-in method of the tubular pile of Claim 1 which connects with a wire and makes the said another wire act so that the said new tubular pile may not isolate | separate from the said falling device.

請求項５記載の発明は、前記第２工程の吊り上げ時おいて、吊ワイヤーを、天秤を介して前記打ち下げ装置に設けられた連結部に連結するとともに、同天秤を、分配吊ワイヤーを介して前記新たな管状杭の外周面に固設された連結部に連結して、前記新たな管状杭を前記接続手段及び前記分配吊ワイヤーによって支持する請求項１に記載の管状杭の圧入方法である。   According to a fifth aspect of the present invention, at the time of lifting in the second step, the suspension wire is connected to a connecting portion provided in the lowering device via a balance, and the balance is connected via a distribution suspension wire. The tubular pile press-fitting method according to claim 1, wherein the tubular pile is supported by the connecting means and the distribution suspension wire by being connected to a connecting portion fixed on an outer peripheral surface of the new tubular pile. is there.

請求項６記載の発明は、円筒状の本体を有する打ち下げ装置の下端部を、管状杭の上端部に挿し込んだ状態で接続する打ち下げ装置と管状杭との接続構造であって、
前記下端部の外周部に打ち下げ装置側抜け止め係合部が設けられ、
前記管状杭の内周部に杭側抜け止め係合部が設けられ、
前記下端部が前記管状杭に挿し込まれた後前記管状杭に対して相対的に回動することで、前記打ち下げ装置側抜け止め係合部が前記杭側抜け止め係合部の下側に配置されて前記打ち下げ装置が前記管状杭から抜けることを阻止するように係合可能にされた打ち下げ装置と管状杭との接続構造である。 The invention according to claim 6 is a connection structure between the lowering device and the tubular pile that connects the lower end of the lowering device having a cylindrical main body in a state of being inserted into the upper end of the tubular pile,
A lowering device side retaining engagement portion is provided on the outer peripheral portion of the lower end portion,
A pile side retaining engagement portion is provided on the inner periphery of the tubular pile,
After the lower end portion is inserted into the tubular pile, it rotates relative to the tubular pile so that the lowering device side retaining engagement portion is below the pile side retaining engagement portion. And a connection structure between the lowering device and the tubular pile arranged so as to be engageable so as to prevent the lowering device from coming off the tubular pile.

本発明によれば、管状杭の上端部に打ち下げ装置の下端部を接続するとともに、流体物供給配管を打ち下げ装置の内部を通して設置した後、管状杭及び打ち下げ装置を杭圧入機のチャック装置に把持させた状態に建て込むので、打ち下げ装置と流体物吐出工法とを併用した管状杭の地盤への圧入施工を、流体物の供給を停止させることなく実施可能である。   According to the present invention, after connecting the lower end portion of the lowering device to the upper end portion of the tubular pile and installing the fluid supply pipe through the inside of the lowering device, the tubular pile and the lowering device are attached to the chuck of the pile press-in machine. Since it is built in a state of being gripped by the device, it is possible to carry out the press-fitting construction of the tubular pile to the ground using both the driving device and the fluid discharge method without stopping the supply of the fluid.

本発明の第１実施形態に係る打ち下げ装置の側面図（内部可視化）である。It is a side view (internal visualization) of the driving-down apparatus concerning a 1st embodiment of the present invention. 本発明の第１実施形態に係る打ち下げ装置及びこれに接続する管状杭の側面図（内部可視化）で、吊り方の一例を示す。An example of how to suspend is shown in a side view (internal visualization) of a downhill device concerning a 1st embodiment of the present invention, and a tubular pile connected to this. 本発明の第１実施形態に係る打ち下げ装置及びこれに接続する管状杭の側面図（内部可視化）で、吊り方の他の一例を示す。The side view (internal visualization) of the falling device which concerns on 1st Embodiment of this invention, and the tubular pile connected to this is shown another example of how to suspend. 本発明の第１実施形態に係る打ち下げ装置及びこれに接続する管状杭の側面図（内部可視化）で、吊り方の他の一例を示す。The side view (internal visualization) of the falling device which concerns on 1st Embodiment of this invention, and the tubular pile connected to this is shown another example of how to suspend. 本発明の第１実施形態に係る打ち下げ装置及びこれに接続する管状杭の側面図（内部可視化）で、吊り方の他の一例を示す。The side view (internal visualization) of the falling device which concerns on 1st Embodiment of this invention, and the tubular pile connected to this is shown another example of how to suspend. 本発明の第１実施形態に係る管状杭の圧入方法の各工程を示す図（内部可視化）である。It is a figure (internal visualization) which shows each process of the press-fitting method of the tubular pile which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る管状杭の圧入方法に用いられる杭圧入機や杭の側面図（内部可視化）である。It is a side view (internal visualization) of a pile press-fit machine and a pile used for the press-fitting method of the tubular pile concerning a 1st embodiment of the present invention. 本発明の第２実施形態に係る打ち下げ装置の側面図である。It is a side view of the driving-down apparatus concerning a 2nd embodiment of the present invention. 本発明の第２実施形態に係る打ち下げ装置及びこれに接続する管状杭の側面図（内部可視化）で、吊ワイヤーも示す。The hanging wire is also shown in the side view (internal visualization) of the downhill device according to the second embodiment of the present invention and the tubular pile connected thereto.

以下に本発明の一実施形態につき図面を参照して説明する。以下は本発明の一実施形態であって本発明を限定するものではない。   An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

〔第１実施形態〕
まず、図１から図７を参照して本発明の第１実施形態につき説明する。なお、「上端」「下端」「下側」等の上下関係を示す用語は、打ち下げ装置を上に管状杭を下にして立てた状態における上下を基準としている。
本発明の第１実施形態に係る打ち下げ装置の側面図を図１に、これに接続する管状杭を含めた側面図を図２から図６に、さらに杭圧入機を含めた側面図を図７に示す。なお、図１から図７には、スイベルジョイント１４の上端部１４ｂに接続する流体物供給装置からのホース４を図示し、下記第２実施形態（図８，９）のスイベル架台１３及びホース２３は設けられず、スイベルジョイント１４の下端部１４ａに比較的高さがある形態を図示する。
本実施形態は、管状杭の上端部に、円筒状の本体を有した打ち下げ装置の下端部を挿し込んだ状態で接続させるための接続手段として、管状杭には特別な構成は設けず、打ち下げ装置４０の管状杭２０に挿入される下端部であるクランプ装置４１を同接続手段としたものである。このクランプ装置４１は、杭圧入機３０のクランプ装置３２（図７参照）と同様の機構のもので、管状杭の内周面を押圧する押圧部材やこれを進退動作させ、所定の把持力を達成するための押圧力を発揮できるシリンダ装置を有し、打ち下げ装置４０全体の重量は比較的大きくなる（下記第２実施形態比）。 [First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS. The terms indicating the upper and lower relations such as “upper end”, “lower end”, and “lower side” are based on the upper and lower sides in a state where the lowering device is set up with the tubular pile down.
FIG. 1 is a side view of a driving apparatus according to the first embodiment of the present invention, FIG. 2 to FIG. 6 are side views including a tubular pile connected thereto, and FIG. 7 shows. 1 to 7 show the hose 4 from the fluid supply device connected to the upper end portion 14b of the swivel joint 14, and the swivel base 13 and the hose 23 of the second embodiment (FIGS. 8 and 9) described below. Is shown, and the lower end portion 14a of the swivel joint 14 has a relatively high height.
In this embodiment, as a connection means for connecting the lower end of the lowering device having a cylindrical main body to the upper end portion of the tubular pile, a special configuration is not provided for the tubular pile, A clamping device 41 which is a lower end portion inserted into the tubular pile 20 of the driving device 40 is used as the connection means. This clamping device 41 is of the same mechanism as the clamping device 32 (see FIG. 7) of the pile press-in machine 30, and a pressing member that presses the inner peripheral surface of the tubular pile and a forward / backward movement thereof, thereby providing a predetermined gripping force. It has a cylinder device capable of exerting a pressing force to achieve, and the weight of the entire lowering device 40 becomes relatively large (compared to the second embodiment below).

図２、図３、図４又は図５に示すように本実施形態の打ち下げ装置４０を管状杭２０の上端部にクランプ装置４１によって接続するととともに、流体物供給配管１５を打ち下げ装置４０の内部を通して設置する第１工程を実施し、その後の第２工程の吊り上げ時おいて、これをクレーンにより吊り上げる際の連結方法として以下の４つを説明する。   As shown in FIG. 2, FIG. 3, FIG. 4 or FIG. 5, the lowering device 40 of this embodiment is connected to the upper end of the tubular pile 20 by a clamp device 41 and the fluid supply pipe 15 is connected to the lowering device 40. The following four methods will be described as connecting methods when the first step of installing through the inside is carried out and the subsequent second step is lifted by a crane.

図２に示すように、第２工程の吊り上げ時おいて、吊ワイヤー９を新たな管状杭２０の外周面に固設された吊り用連結部２４にのみ連結して、打ち下げ装置４０を新たな管状杭２０による下支えのみによって支持する。打ち下げ装置４０はクランプ装置４１が付属する分重量が大きい。吊ワイヤー９及び吊り用連結部２４が耐久する安全な範囲で実施することができない恐れがある場合などは、以下のいずれかの方法を実施するとよい。   As shown in FIG. 2, at the time of lifting in the second step, the hanging wire 9 is connected only to the hanging connecting portion 24 fixed to the outer peripheral surface of the new tubular pile 20, and the lowering device 40 is newly added. It is supported only by the support by the tubular pile 20. The lowering device 40 is heavy due to the attachment of the clamping device 41. When there is a possibility that the suspension wire 9 and the suspension connecting portion 24 cannot be carried out within a safe range to be durable, one of the following methods may be performed.

図３に示すように、第２工程の吊り上げ時おいて、吊ワイヤー９を打ち下げ装置４０に設けられた吊り用連結部４２にのみ連結して、新たな管状杭２０を接続手段（クランプ装置４１）のみによって支持する。
この連結方法にあたっては、予め、打ち下げ装置４０と管状杭２０とを合わせた重量に耐えられるように吊り用連結部４２を構成しておく。
この連結方法の場合、クランプ装置４１による把持力によって管状杭２０の重量に耐えられるかが懸念点となり得る。すなわち、管状杭２０が打ち下げ装置４０に対してずれ下がったり、分離し落下したりしないかが懸念点となり得る。懸念される場合などは、以下のいずれかの方法を実施するとよい。 As shown in FIG. 3, at the time of lifting in the second step, the hanging wire 9 is connected only to the suspension connecting portion 42 provided in the lowering device 40, and the new tubular pile 20 is connected to the connecting means (clamp device). 41) only.
In this connection method, the suspension connection portion 42 is configured in advance so as to withstand the combined weight of the driving device 40 and the tubular pile 20.
In the case of this connection method, it may be a concern whether the weight of the tubular pile 20 can be withstood by the gripping force by the clamp device 41. That is, it may be a concern whether the tubular pile 20 does not slide down with respect to the driving device 40 or does not separate and fall. If you are concerned about any of the following, you may do one of the following:

図４に示すように、第２工程の吊り上げ時おいて、吊ワイヤー９を打ち下げ装置４０に設けられた吊り用連結部４２にのみ連結するとともに、打ち下げ装置４０と新たな管状杭２０とを別ワイヤー３により連結して、別ワイヤー３を、新たな管状杭２０が打ち下げ装置４０から分離しないように作用させる。
別ワイヤー３の上端は、打ち下げ装置４０に特別に設けられた連結部４５に連結プレート４４を介して連結し、別ワイヤー３の下端は、図２に示した方法でも利用した吊り用連結部２４に連結する。連結プレート４４の別ワイヤー３との連結部は、打ち下げ装置４０の外周より外方に張り出しており、別ワイヤー３と打ち下げ装置４０との干渉を防止する。
この連結方法によれば、管状杭２０が打ち下げ装置４０に対して若干ずれ下がることがあっても、別ワイヤー３が緊張し（張力が増し）、それ以上ずれ下がって管状杭２０と打ち下げ装置４０と分離しないように保持することができる。管状杭２０の重量がかかってもクランプ装置４１が管状杭２０から抜けないように、別ワイヤー３の長さと機械的特性を選定する。
吊り上げ前に別ワイヤー３に緩みがある状態で連結した場合、別ワイヤー３に緩みがある間は、図３に示した方法と同様に管状杭２０をクランプ装置４１のみによって支持することとなる。 As shown in FIG. 4, at the time of lifting in the second step, the hanging wire 9 is connected only to the suspension connecting portion 42 provided in the lowering device 40, and the lowering device 40 and the new tubular pile 20 are connected. Are connected by another wire 3, and the other wire 3 is made to act so that the new tubular pile 20 does not separate from the driving device 40.
The upper end of the separate wire 3 is connected to a connecting portion 45 specially provided in the driving device 40 via a connecting plate 44, and the lower end of the separate wire 3 is a connecting portion for suspension that is also used in the method shown in FIG. 24. A connecting portion of the connecting plate 44 with the other wire 3 protrudes outward from the outer periphery of the lowering device 40, and prevents interference between the other wire 3 and the lowering device 40.
According to this connection method, even if the tubular pile 20 is slightly displaced with respect to the lowering device 40, the other wire 3 is tensioned (tensile is increased), and the tubular pile 20 is further displaced and lowered. It can be held so as not to be separated from the device 40. The length and mechanical characteristics of the separate wire 3 are selected so that the clamp device 41 does not come out of the tubular pile 20 even if the weight of the tubular pile 20 is applied.
When the separate wire 3 is connected in a loose state before lifting, the tubular pile 20 is supported only by the clamp device 41 as in the method shown in FIG. 3 while the separate wire 3 is loose.

図４に示した連結方法で生じうる管状杭２０の若干のすれ下がりを防止するためには、以下の方法を実施するとよい。
図５に示すように、第２工程の吊り上げ時おいて、吊ワイヤー９を、天秤４３を介して打ち下げ装置４０に設けられた吊り用連結部４２に連結するとともに、天秤４３を、分配吊ワイヤー２を介して新たな管状杭２０の外周面に固設された吊り用連結部２４に連結して、新たな管状杭２０を接続手段（クランプ装置４１）及び分配吊ワイヤー２によって支持する。天秤４３の分配吊ワイヤー２との連結部は、打ち下げ装置４０の外周より外方に張り出しており、分配吊ワイヤー２と打ち下げ装置４０との干渉を防止する。
天秤４３は、クランプ装置４１及び吊り用連結部４２による連結を介して管状杭２０及び打ち下げ装置４０の重量を支持するのみならず、分配吊ワイヤー２を引き上げる方に回動することで、管状杭２０を打ち下げ装置４０に対して押し上げるように支持する。これにより、吊り上げの初期から、管状杭２０を打ち下げ装置４０に対して押し付けるように支持する力が作用し、管状杭２０が打ち下げ装置４０に対してずれ下がることを防止し、当然に分離することを防止する。管状杭２０が打ち下げ装置４０に対してずれ下がらなくても、吊り上げ時に管状杭２０を打ち下げ装置４０に対して押し付けるように支持する力が作用する。 In order to prevent slight slipping of the tubular pile 20 that may occur in the connection method illustrated in FIG. 4, the following method may be performed.
As shown in FIG. 5, at the time of lifting in the second step, the hanging wire 9 is connected to a suspension connecting portion 42 provided in the lowering device 40 via a balance 43 and the balance 43 is distributed and suspended. The new tubular pile 20 is supported by the connecting means (clamp device 41) and the distribution hanging wire 2 by being connected to the suspension connecting portion 24 fixed on the outer peripheral surface of the new tubular pile 20 via the wire 2. The connecting portion of the balance 43 with the distribution suspension wire 2 projects outward from the outer periphery of the lowering device 40, and prevents interference between the distribution suspension wire 2 and the lowering device 40.
The balance 43 not only supports the weight of the tubular pile 20 and the lowering device 40 through the connection by the clamp device 41 and the suspension connection portion 42, but also rotates in the direction of pulling up the distribution suspension wire 2, thereby forming a tubular shape. The pile 20 is supported so as to be pushed up against the driving device 40. Thereby, from the initial stage of lifting, a force for supporting the tubular pile 20 to be pressed against the lowering device 40 acts, so that the tubular pile 20 is prevented from slipping down with respect to the lowering device 40 and naturally separated. To prevent. Even if the tubular pile 20 does not slide down with respect to the lowering device 40, a force that supports the tubular pile 20 to press against the lowering device 40 during lifting is applied.

改めて図６及び図７を参照して、管状杭の圧入方法につき説明する。
まず、図６(a)に示す新たな管状杭２０内に、図６(b)に示すように流体物供給配管を施工する。管状杭２０内に施工する流体物供給配管は、パイプ２２と、配管継手２５である。パイプ２２は、管状杭２０の軸方向に沿って配置され管状杭２０の内周面に固定される。また、パイプ２２の上端には配管継手２５が設けられる。 With reference to FIGS. 6 and 7 again, a method for press-fitting a tubular pile will be described.
First, a fluid supply pipe is constructed in a new tubular pile 20 shown in FIG. 6A as shown in FIG. The fluid supply pipes constructed in the tubular pile 20 are a pipe 22 and a pipe joint 25. The pipe 22 is disposed along the axial direction of the tubular pile 20 and is fixed to the inner peripheral surface of the tubular pile 20. A pipe joint 25 is provided at the upper end of the pipe 22.

次に、図６(b)→(c)に示すように、打ち上げ装置４０のクランプ装置４１を管状杭２０に挿し込み、さらに打ち下げ装置４０の内部を通した状態でホース１５と配管継手２５とを接続する。
以上のようにして、新たな管状杭２０の上端部に、円筒状の本体を有した打ち下げ装置４０の下端部であるクランプ装置４１を挿し込んだ状態で接続手段であるクランプ装置４１により接続するととともに、流体物供給配管（ホース１５）を打ち下げ装置の内部を通して設置する（第１工程）。
なお、以上の図６(a)から(c)までの工程は、作業性のため打ち下げ装置４０及び管状杭２０を横倒しにした状態で行う。 Next, as shown in FIGS. 6 (b) → (c), the clamp device 41 of the launch device 40 is inserted into the tubular pile 20, and the hose 15 and the pipe joint 25 are passed through the interior of the lower device 40. And connect.
As described above, the clamp device 41, which is a connection means, is connected to the upper end portion of the new tubular pile 20 in a state where the clamp device 41, which is the lower end portion of the lowering device 40 having a cylindrical main body, is inserted. At the same time, the fluid supply pipe (hose 15) is installed through the inside of the driving device (first step).
In addition, the process from the above FIG. 6 (a) to (c) is performed in the state which laid down the falling device 40 and the tubular pile 20 for workability | operativity.

次に、図６(d)に示すようにクレーンからの吊ワイヤー９等の吊り具を、図２から図５を参照して説明したいずれかの方法により連結する。図６では代表して図５に示した連結構造を示した。
次に、そのクレーンによって新たな管状杭２０及び打ち下げ装置４０を吊り上げ、新たな管状杭２０を図７に示す杭圧入機３０のチャック装置３６に把持させた状態に建て込む（第２工程）。 Next, as shown in FIG. 6 (d), a hanging tool such as a hanging wire 9 from the crane is connected by any of the methods described with reference to FIGS. FIG. 6 shows the connecting structure shown in FIG. 5 as a representative.
Next, the new tubular pile 20 and the lowering device 40 are lifted by the crane, and the new tubular pile 20 is built in a state of being gripped by the chuck device 36 of the pile press-in machine 30 shown in FIG. 7 (second step). .

杭圧入機３０の構成、機能は次の通りである。
杭圧入機３０は、サドル３１の下部に設けられたクランプ装置３２と、サドル３１上を前後動可能に設けられたスライドベース３３と、スライドベース３３上に旋回可能に立設されたマスト３４と、昇降機構３５と、昇降機構３５を介してマスト３４に支持されたチャック装置３６とを備える。昇降機構３５の動作により、チャック装置３６をマスト３４、従ってクランプ装置３２に対して昇降させることができる。
クランプ装置３２は、管状杭に挿入され管状杭の内周面に向かって進退し当該内周面を押圧する押圧部材を放射状に複数配置して有し、各押圧部材を互いに径方向に離れるように拡開させることで管状杭の上端部を内側から把持する。
チャック装置３６は、管状杭が挿入される開口を有するとともに、当該開口に挿入された管状杭の外周面に向かって進退し当該外周面を押圧する押圧部材を放射状に複数配置して有し、各押圧部材を互いに径方向に近づくように縮閉させることで管状杭を外側から把持する。また、チャック装置３６は、把持した管状杭２０や打ち下げ装置４０を回転させる機能を有し、杭圧入機３０は回転圧入工法が実施可能である。
図７に示す杭圧入機３０は、地盤に圧入された既設の管状杭２０ａ，２０ｂ，２０ｃをクランプ装置３２ａ，３２ｂ，３２ｃで把持して当該既設の管状杭２０ａ，２０ｂ，２０ｃから反力を取り、新たな管状杭２０ｅをチャック装置３６で把持して地盤に圧入する管状杭の圧入方法を実施可能である（図７はさらにサドル３１が前進した場面）。 The configuration and function of the pile press-in machine 30 are as follows.
The pile press-in machine 30 includes a clamp device 32 provided at a lower portion of the saddle 31, a slide base 33 provided on the saddle 31 so as to be movable back and forth, and a mast 34 provided so as to be turnable on the slide base 33. The elevating mechanism 35 and the chuck device 36 supported by the mast 34 via the elevating mechanism 35 are provided. By the operation of the lifting mechanism 35, the chuck device 36 can be lifted and lowered with respect to the mast 34, and thus the clamping device 32.
The clamping device 32 has a plurality of radially arranged pressing members that are inserted into the tubular pile and advanced and retracted toward the inner peripheral surface of the tubular pile to press the inner peripheral surface, and the pressing members are separated from each other in the radial direction. The upper end portion of the tubular pile is gripped from the inside by expanding it.
The chuck device 36 has an opening into which the tubular pile is inserted, and has a plurality of radially arranged pressing members that advance and retract toward the outer peripheral surface of the tubular pile inserted into the opening and press the outer peripheral surface. The tubular pile is gripped from the outside by contracting the pressing members so as to approach each other in the radial direction. Further, the chuck device 36 has a function of rotating the gripped tubular pile 20 and the lowering device 40, and the pile press-in machine 30 can implement a rotary press-in method.
The pile press-in machine 30 shown in FIG. 7 grips the existing tubular piles 20a, 20b, 20c press-fitted into the ground with the clamp devices 32a, 32b, 32c, and generates reaction force from the existing tubular piles 20a, 20b, 20c. It is possible to implement a method for press-fitting a tubular pile, in which a new tubular pile 20e is gripped by the chuck device 36 and press-fitted into the ground (FIG. 7 shows a situation where the saddle 31 is further advanced).

スイベルジョイント１４の上端部１４ｂに、流体物供給装置からのホース４を接続し、同ホース４と、ホース１５とがスイベルジョイント１４を介して流体物を流通させるように接続する。スイベルジョイント１４の上端部１４ｂに接続するホース４をサポートアーム１６の先端に支持された掛け金１７に掛ける。なお、このホース４の接続は、次の流体物吐出を行う前であれば、どの段階で行ってもよいが、クレーンによって新たな管状杭２０及び打ち下げ装置４０を吊り上げる前に行うことが好ましい。管状杭２０及び打ち下げ装置４０が不安定な状態での接続作業やや高所での接続作業を回避できるからである。
次に、流体供給配管（４，１４，１５，２２，２５を含む）を通して流体物を新たな管状杭２０ｅの先端部の圧入に抗する地盤に吐出しながら杭圧入機３０を動作させ、チャック装置３６の把持位置に打ち下げ装置４０が下がるまで新たな管状杭２０ｅを打ち下げて地盤に圧入する（第３工程）。
チャック装置３６の把持位置に打ち下げ装置４０が下がるまでとは、図７に示すように直接に打ち下げ装置４０の管状杭２０より上方の部分を把持するまでに限らず、直接的には管状杭２０を把持するけれども、チャック装置３６の把持位置の上下方向範囲に打ち下げ装置４０の最下端が進入していればよい。チャック装置３６の把持力による管状杭２０の潰れを防止して、打ち下げ装置４０を使用する意義が顕在化するからである。
なお、管状杭２０ｅを計画レベルまで打ち下げた後、チャック装置３６による打ち下げ装置４０の把持を維持しつつ、クランプ装置３２の把持解除、サドル３１の上昇、サドル３１の前進、サドル３１の下降、クランプ装置３２の再把持に過程により、既設の管状杭２０ｂ，２０ｃ，２０ｄをクランプ装置３２ａ，３２ｂ，３２ｃで把持すると図７に示す状態となり、管状杭２０ｅの先にさらに管状杭の圧入が行える。 The hose 4 from the fluid supply device is connected to the upper end portion 14 b of the swivel joint 14, and the hose 4 and the hose 15 are connected so as to circulate the fluid through the swivel joint 14. The hose 4 connected to the upper end portion 14 b of the swivel joint 14 is hung on a latch 17 supported on the tip of the support arm 16. The connection of the hose 4 may be performed at any stage as long as it is before the next fluid discharge, but is preferably performed before the new tubular pile 20 and the lowering device 40 are lifted by the crane. . This is because it is possible to avoid connection work in a state where the tubular pile 20 and the lowering device 40 are unstable and connection work at a high place.
Next, the pile press-in machine 30 is operated while discharging the fluid through the fluid supply pipe (including 4, 14, 15, 22, 25) to the ground against the press-fit of the tip of the new tubular pile 20e, and the chuck The new tubular pile 20e is pushed down and pressed into the ground until the lowering device 40 is lowered to the gripping position of the device 36 (third step).
The time until the lowering device 40 is lowered to the gripping position of the chuck device 36 is not limited to directly gripping a portion above the tubular pile 20 of the lowering device 40 as shown in FIG. Although the pile 20 is gripped, it is sufficient that the lowermost end of the lowering device 40 enters the vertical range of the gripping position of the chuck device 36. This is because it is possible to prevent the tubular pile 20 from being crushed by the gripping force of the chuck device 36, and the significance of using the driving device 40 becomes obvious.
Note that after the tubular pile 20e is lowered to the planned level, the holding of the lowering device 40 by the chuck device 36 is maintained, the holding of the clamping device 32 is released, the saddle 31 is raised, the saddle 31 is advanced, and the saddle 31 is lowered. When the existing tubular piles 20b, 20c, and 20d are gripped by the clamp devices 32a, 32b, and 32c in the process of re-gripping the clamp device 32, the state shown in FIG. 7 is obtained, and the tubular pile is further pressed into the tip of the tubular pile 20e. Yes.

〔第２実施形態〕
次に、図８、図９を参照して本発明の第２実施形態につき説明する。
図８に本発明の第２実施形態に係る打ち下げ装置の側面図を示す。図９に、第２実施形態に係る打ち下げ装置を鋼管杭に接続した状態の側面図を示す。上記第１実施形態と共通の要素に同符号を付す。
本実施形態の打ち下げ装置１０は、円筒状の本体１１を有する。円筒状の本体１１は、上方部１１ａ及び下端部１１ｂの各円筒体（鋼管）を同軸に連続させた構造である。上方部１１ａは、管状杭の上方に配置される部分であり、下端部１１ｂは、管状杭の上端部に挿し込まれる部分である。上方部１１ａの外径は管状杭の外径程度にされている。
下端部１１ｂは、上部嵌合部１１ｂ１と、下部係合部１１ｂ２とを有する。上部嵌合部１１ｂ１は、上方部１１ａの下端に続く円筒体で上方部１１ａより半径が管状杭の厚み程度小径にされており、管状杭の内側に嵌入される。上部嵌合部１１ｂ１の外周面（管状杭の内側に嵌合する面）は、一周に亘って連続する必要はなく、周方向に間隔隔てて部分的に突出した複数の部分で構成してもよい。例えば、中心角３０〜４５度程度の範囲で最外径部を構成する突出部分３〜６つを、周方向に分散して配置した構造である。その突出部分を着脱自在の鋼板プレート（断面円弧状の鋼板プレートとなる）として、径方向の厚みの異なる鋼板プレートに交換することで、外径が同一で厚みの異なる（従って内径が異なる）管状杭に対応するように実施することができる。もちろん、その着脱式の鋼板プレートを複数枚装着することによって、管状杭の内側に嵌合する外周面が、一周に亘って連続する結果となっても構わない。
下部係合部１１ｂ２の外周部に、打ち下げ装置側抜け止め係合部１２ａ及び回動規制部１２ｂが同じ厚みで設けられている。打ち下げ装置側抜け止め係合部１２ａ及び回動規制部１２ｂは、鋼板でＬ字状に構成され、溶接により下部係合部１１ｂ２の外周面に接合されて当該外周面から径方向外側に突出するように設けられる。回動規制部１２ｂは、打ち下げ装置側抜け止め係合部１２ａの周方向の一端部に連続して上端方向へ延設されるように形成されている。
下部係合部１１ｂ２は、上部嵌合部１１ｂ１の下端に続く円筒体で上部嵌合部１１ｂ１より半径が打ち下げ装置側抜け止め係合部１２ａ（以下「装置側抜け止め係合部１２ａ」）の厚み程度小径である。装置側抜け止め係合部１２ａ及び回動規制部１２ｂの表面の半径位置が上部嵌合部１１ｂ１の外径位置に相当する。
装置側抜け止め係合部１２ａとこれに連続する回動規制部１２ｂとを合わせて回動規制付抜け止め係合部１２と呼ぶ。回動規制付抜け止め係合部１２は、下部係合部１１ｂ２の中心軸周りに１８０度反対側にも設けられている。したがって、装置側抜け止め係合部１２ａ及び回動規制部１２ｂの表面が管状杭の内側に嵌合する。
２つの回動規制付抜け止め係合部１２の間に装置側抜け止め係合部１２ａをさらに設けてもよい（本実施形態では設けられていないものとする。）。
２つの回動規制付抜け止め係合部１２の間に、これと同厚みの鋼板を設けて、単に管状杭の内側に嵌合する部分としてもよい（本実施形態では設けられていないものとする。）。 [Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 8 shows a side view of the driving device according to the second embodiment of the present invention. In FIG. 9, the side view of the state which connected the downfall apparatus which concerns on 2nd Embodiment to the steel pipe pile is shown. Elements common to the first embodiment are given the same reference numerals.
The driving device 10 of the present embodiment has a cylindrical main body 11. The cylindrical main body 11 has a structure in which each cylindrical body (steel pipe) of the upper portion 11a and the lower end portion 11b is coaxially continuous. The upper part 11a is a part arrange | positioned above a tubular pile, and the lower end part 11b is a part inserted in the upper end part of a tubular pile. The outer diameter of the upper portion 11a is set to be about the outer diameter of the tubular pile.
The lower end part 11b has an upper fitting part 11b1 and a lower engaging part 11b2. The upper fitting part 11b1 is a cylindrical body following the lower end of the upper part 11a. The radius of the upper fitting part 11b1 is smaller than that of the upper part 11a by the thickness of the tubular pile, and is fitted inside the tubular pile. The outer peripheral surface of the upper fitting portion 11b1 (the surface that fits inside the tubular pile) does not have to be continuous over the entire circumference, and may be composed of a plurality of portions that partially protrude in the circumferential direction. Good. For example, it has a structure in which 3 to 6 projecting portions constituting the outermost diameter portion are distributed in the circumferential direction in a range of a central angle of about 30 to 45 degrees. By replacing the protruding part as a detachable steel plate (which becomes a steel plate with a circular arc cross section) with a steel plate having a different radial thickness, the outer diameter is the same and the thickness is different (and thus the inner diameter is different). Can be implemented to correspond to piles. Of course, by attaching a plurality of the detachable steel plate plates, the outer peripheral surface that fits inside the tubular pile may result in a continuous circumference.
On the outer peripheral portion of the lower engaging portion 11b2, the lowering device side retaining engagement portion 12a and the rotation restricting portion 12b are provided with the same thickness. The lowering device side retaining engagement portion 12a and the rotation restricting portion 12b are formed in an L shape with a steel plate, joined to the outer peripheral surface of the lower engaging portion 11b2 by welding, and project radially outward from the outer peripheral surface. To be provided. The rotation restricting portion 12b is formed so as to extend in the upper end direction continuously to one end portion in the circumferential direction of the lowering device side retaining engagement portion 12a.
The lower engaging portion 11b2 is a cylindrical body that continues to the lower end of the upper fitting portion 11b1, and has a radius that is lower than that of the upper fitting portion 11b1. The device side retaining engagement portion 12a (hereinafter, “device side retaining engagement portion 12a”). The diameter is about as small as the thickness. The radial position of the surface of the apparatus side retaining engagement portion 12a and the rotation restricting portion 12b corresponds to the outer diameter position of the upper fitting portion 11b1.
The apparatus-side retaining engagement portion 12a and the rotation restricting portion 12b continuous therewith are collectively referred to as a rotation restricting retaining engagement portion 12 with rotation restriction. The rotation-preventing retaining engagement portion 12 with rotation restriction is also provided on the opposite side around the central axis of the lower engagement portion 11b2. Accordingly, the surfaces of the device-side retaining engagement portion 12a and the rotation restricting portion 12b are fitted inside the tubular pile.
An apparatus-side retaining engagement portion 12a may be further provided between the two rotation restricting retaining engagement portions 12 (assumed not provided in the present embodiment).
It is good also as a part which provides the steel plate of the same thickness as this between the two rotation control attaching retaining parts 12 with a restriction | limiting, and only fits inside a tubular pile (it is not provided in this embodiment). To do.)

上方部１１ａには、作業や確認のための窓１１ａ１と、挟締金具用の開口１１ａ２が設けられている。挟締金具用の開口１１ａ２は、上方部１１ａと上部嵌合部１１ｂ１との段差の近傍に設けられ、窓１１ａ１はそれより上部に設けられる。開口１１ａ２を通して跨らせた挟締金具８（図９参照）の両側の押圧部が、上部嵌合部１１ｂ１の位置まで届けばよい。
上方部１１ａの上端部には、スイベル架台１３が立設固定されており、スイベル架台１３にスイベルジョイント１４が設置されている。スイベルジョイント１４は上方部１１ａの上端より上方で中央寄りに配置される。
スイベルジョイント１４の下端部１４ａは、スイベル架台１３に固定されている。スイベルジョイント１４の上端部１４ｂは、下端部１４ａに対して回転自在に連結されており、その回転の軸が円筒状の本体１１の軸方向となるようにスイベルジョイント１４は設置されている。
スイベルジョイント１４の下端部１４ａにホース１５が接続されている。ホース１５は、本体１１の内部を通って本体１１の下端開口から延出する長さとされている。
スイベルジョイント１４の上端部１４ｂには、流体物供給装置からのホース（図２に示すホース４と同じ）が接続され、同ホースと、上記ホース１５とがスイベルジョイント１４を介して流体物を流通させるように接続可能である。
また、上記第１実施形態と同様に、スイベルジョイント１４の上端部１４ｂには、スイベルジョイント１４の回転軸に垂直な方向へ延在するようにサポートアーム１６の一端が固定されており、サポートアーム１６の他端には掛け金１７が固定されている。スイベルジョイント１４の上端部１４ｂに接続するホースを掛け金１７に掛けて、打ち下げ装置１０やこれに接続する管状杭等に接触しないように離される。 The upper portion 11a is provided with a window 11a1 for work and confirmation, and an opening 11a2 for a clamp. The clamping metal opening 11a2 is provided in the vicinity of the step between the upper portion 11a and the upper fitting portion 11b1, and the window 11a1 is provided above the opening 11a2. The pressing parts on both sides of the clamp member 8 (see FIG. 9) straddling through the opening 11a2 may reach the position of the upper fitting part 11b1.
A swivel base 13 is erected and fixed to an upper end portion of the upper part 11 a, and a swivel joint 14 is installed on the swivel base 13. The swivel joint 14 is disposed closer to the center above the upper end of the upper portion 11a.
A lower end portion 14 a of the swivel joint 14 is fixed to the swivel base 13. The upper end portion 14 b of the swivel joint 14 is rotatably connected to the lower end portion 14 a, and the swivel joint 14 is installed so that the axis of rotation is the axial direction of the cylindrical main body 11.
A hose 15 is connected to the lower end portion 14 a of the swivel joint 14. The hose 15 has a length that extends from the lower end opening of the main body 11 through the inside of the main body 11.
A hose from the fluid supply device (same as the hose 4 shown in FIG. 2) is connected to the upper end portion 14 b of the swivel joint 14, and the hose and the hose 15 circulate the fluid through the swivel joint 14. It is possible to connect.
As in the first embodiment, one end of the support arm 16 is fixed to the upper end portion 14b of the swivel joint 14 so as to extend in a direction perpendicular to the rotation axis of the swivel joint 14. A latch 17 is fixed to the other end of 16. A hose connected to the upper end portion 14b of the swivel joint 14 is hung on the latch 17 so as not to come into contact with the lowering device 10 or a tubular pile connected to the lowering device 10.

管状杭２０に対しては、まず、位置規制治具を用いて杭側抜け止め係合部２１を管状杭２０の内周面に溶接する。
位置規制治具は、管状杭の開口端に嵌るリング部と、このリング部に一端が固定され、他端にＬ字部が形成されたアーム部とを備える。リング部を管状杭２０の上端の開口端に嵌め、アーム部が管状杭２０内に挿入されるように配置すると、アーム部が管状杭２０の内周面に沿って配置され、管状杭２０の上端から所定の深さ位置にＬ字部が配置される。杭側抜け止め係合部２１の接合面を管状杭２０の内周面に当てるとともに、Ｌ字部によって管状杭２０の軸方向及び周方向について位置規制されるように杭側抜け止め係合部２１の２端面をＬ字部に当てて配置し、この位置で杭側抜け止め係合部２１を管状杭２０の内周面に溶接する。 For the tubular pile 20, first, the pile-side retaining engagement portion 21 is welded to the inner peripheral surface of the tubular pile 20 using a position regulating jig.
The position restricting jig includes a ring portion that fits into the open end of the tubular pile, and an arm portion that has one end fixed to the ring portion and an L-shaped portion formed at the other end. When the ring part is fitted to the open end of the upper end of the tubular pile 20 and the arm part is disposed so as to be inserted into the tubular pile 20, the arm part is disposed along the inner peripheral surface of the tubular pile 20. An L-shaped portion is disposed at a predetermined depth from the upper end. The pile-side retaining engagement portion 21 is applied so that the joint surface of the pile-side retaining engagement portion 21 is applied to the inner peripheral surface of the tubular pile 20 and the position is restricted in the axial direction and the circumferential direction of the tubular pile 20 by the L-shaped portion. The two end surfaces of 21 are arranged so as to contact the L-shaped portion, and the pile side retaining engagement portion 21 is welded to the inner peripheral surface of the tubular pile 20 at this position.

次に、図９に示すように、地盤に圧入する新たな管状杭（鋼管杭）２０の上端部に、打ち下げ装置１０の下端部１１ｂを挿し込んだ状態で接続手段により接続する。管状杭２０の内周部に杭側抜け止め係合部２１が設けられている。杭側抜け止め係合部２１は管状杭２０の内周面から径方向内側に突出するように設けられている。下端部１１ｂの外周と管状杭２０の内周との嵌め合いと、抜け止め係合部１２と抜け止め係合部２１との係合により、打ち下げ装置１０を管状杭２０に抜けないように接続する接続手段が構成されており、以下の手順で接続する。
まず、回動規制付抜け止め係合部１２と杭側抜け止め係合部２１との接触を回避しながら、管状杭２０の上端部に打ち下げ装置１０の下端部１１ｂを挿し込む。管状杭２０の上端が上方部１１ａの下端に当接したら、それ以上挿入できないように止まる。
このように下端部１１ｂを管状杭２０に挿し込んだ後、杭側抜け止め係合部２１が回動規制部１２ｂに当接するまで管状杭２０に対して打ち下げ装置１０を回動させる（図９中矢印Ａ方向）。このことで、装置側抜け止め係合部１２ａが杭側抜け止め係合部２１の下側に配置されて打ち下げ装置１０が管状杭２０から抜けることを阻止するように係合させる。
本実施形態では、以上のような係合が可能にされた打ち下げ装置１０と管状杭２０との接続構造を採用する。なお、打ち下げ装置１０と管状杭２０とを接続する際には、横倒しになった状態で行う。 Next, as shown in FIG. 9, it connects by the connection means in the state which inserted the lower end part 11b of the lowering apparatus 10 in the upper end part of the new tubular pile (steel pipe pile) 20 press-fit in the ground. A pile-side retaining engagement portion 21 is provided on the inner peripheral portion of the tubular pile 20. The pile-side retaining engagement portion 21 is provided so as to protrude radially inward from the inner peripheral surface of the tubular pile 20. By fitting the outer periphery of the lower end portion 11b with the inner periphery of the tubular pile 20 and engaging the retaining engagement portion 12 and the retaining engagement portion 21, the lowering device 10 is prevented from being pulled out into the tubular pile 20. The connection means to connect is comprised and it connects in the following procedures.
First, the lower end portion 11 b of the lowering device 10 is inserted into the upper end portion of the tubular pile 20 while avoiding the contact between the rotation restricting retaining engagement portion 12 and the pile side retaining engagement portion 21. When the upper end of the tubular pile 20 comes into contact with the lower end of the upper portion 11a, the tubular pile 20 stops so that it cannot be inserted any more.
After inserting the lower end portion 11b into the tubular pile 20 in this way, the lowering device 10 is rotated with respect to the tubular pile 20 until the pile side retaining engagement portion 21 contacts the rotation restricting portion 12b (see FIG. 9 (arrow A direction). Thus, the device-side retaining engagement portion 12a is disposed below the pile-side retaining engagement portion 21 and engaged so as to prevent the lowering device 10 from coming off the tubular pile 20.
In the present embodiment, a connection structure between the dropping device 10 and the tubular pile 20 that can be engaged as described above is employed. In addition, when connecting the falling device 10 and the tubular pile 20, it carries out in the state where it laid down.

以上により、打ち下げ装置１０と管状杭２０とを接続した後、ホース２３の他端と、ホース１５のスイベルジョイント１４の逆側の端部には、互いに接続する配管継手２６が設けられるので、これを接続する。
ホース２３を設けず、上記第１実施形態と同様にホース１５の他端がパイプ２２の上端に固定設置された配管継手２５に直接接続するようにしてもよい。
一方、吊り上げ中に打ち下げ装置１０と管状杭２０とが相対的に回ってしまわないように、開口１１ａ２を通して跨らせた挟締金具８により上部嵌合部１１ｂ１の側壁部及び管状杭２０の側壁部を共に挟んで締結する。
以上で第１工程を終了し、次に、図２に示した方法と同様に、吊ワイヤー９を圧入する新たな管状杭２０の上端部外周面に固設された吊り用連結部２４に連結し、第２工程を実施する。
吊り用連結部２４は、上記第１実施形態と同様に、孔を有したタブ状の構成で、１８０度相対する２か所に設けられており、それぞれに吊ワイヤー９を連結する。
この第２工程の吊り上げ時おいて、吊ワイヤー９を新たな管状杭２０の外周面に固設された吊り用連結部２４にのみ連結して、打ち下げ装置１０を新たな管状杭２０による下支えのみによって支持する。
管状杭２０に接続する打ち下げ装置１０の下端部１１ｂは、上記第１実施形態のようにシリンダ装置などのアクチュエータを設ける場合に比較して軽装であり、打ち下げ装置１０全体を十分軽量に構成できるので、このような吊り方が可能である。もちろん、吊ワイヤー９及び吊り用連結部２４が耐久する安全な範囲で実施する。
次に、上記第１実施形態と同様に、新たな管状杭２０を図７に示す杭圧入機３０のチャック装置３６に把持させた状態に建て込む
図７中の管状杭２０ｂについて、杭側抜け止め係合部２１を破線で示した。杭側抜け止め係合部２１は、上述した位置規制治具を用いた溶接によって、正確かつ迅速にクランプ装置３２が接触せず、かつ、深すぎない位置に設置されている。クランプ装置３２による把持に支障を来さないためであり、また、深すぎると打ち下げ装置１０が長大化するためである。また、杭側抜け止め係合部２１を溶接した後でも、上記第１実施形態の打ち下げ装置４０を接続可能である。
杭圧入等のその他の工程は上記第１実施形態と同様に実施する。 As described above, after connecting the lowering device 10 and the tubular pile 20, the other end of the hose 23 and the opposite end of the swivel joint 14 of the hose 15 are provided with pipe joints 26 that are connected to each other. Connect this.
The hose 23 may not be provided, and the other end of the hose 15 may be directly connected to the pipe joint 25 fixedly installed at the upper end of the pipe 22 as in the first embodiment.
On the other hand, the side wall portion of the upper fitting portion 11b1 and the tubular pile 20 are clamped by the clamping fitting 8 straddling through the opening 11a2 so that the lowering device 10 and the tubular pile 20 do not rotate relatively during the lifting. Tighten the side wall together.
Thus, the first step is completed, and then, similarly to the method shown in FIG. 2, the suspension is connected to the suspension connecting portion 24 fixed to the outer peripheral surface of the upper end of the new tubular pile 20 into which the suspension wire 9 is press-fitted. Then, the second step is performed.
Similarly to the first embodiment, the suspension connecting portion 24 has a tab-like configuration with holes, and is provided at two positions opposed to each other by 180 degrees, and connects the suspension wire 9 to each.
At the time of lifting in the second step, the suspension wire 9 is connected only to the suspension connection portion 24 fixed to the outer peripheral surface of the new tubular pile 20, and the lowering device 10 is supported by the new tubular pile 20. Only supported by.
The lower end portion 11b of the lowering device 10 connected to the tubular pile 20 is lighter than the case where an actuator such as a cylinder device is provided as in the first embodiment, and the entire lowering device 10 is sufficiently lightweight. Since it is possible, such a way of hanging is possible. Of course, it implements in the safe range with which the suspension wire 9 and the connection part 24 for suspension are durable.
Next, in the same manner as in the first embodiment, the new tubular pile 20 is built in a state of being gripped by the chuck device 36 of the pile press-in machine 30 shown in FIG. 7. The tubular pile 20b in FIG. The stop engaging portion 21 is indicated by a broken line. The pile-side retaining engagement portion 21 is installed at a position where the clamping device 32 does not contact accurately and quickly and is not too deep by welding using the above-described position regulating jig. This is because the gripping by the clamping device 32 is not hindered, and when the depth is too deep, the driving device 10 is lengthened. Further, even after the pile side retaining engagement portion 21 is welded, the lowering device 40 of the first embodiment can be connected.
Other processes such as pile press-fitting are performed in the same manner as in the first embodiment.

２ 分配吊ワイヤー
３ 別ワイヤー
４ ホース（流体物供給配管）
９ 吊ワイヤー
１０ 打ち下げ装置（第２実施形態）
１１ 本体
１１ａ 上方部
１１ｂ 下端部
１２ 回動規制付抜け止め係合部
１２ａ 打ち下げ装置側抜け止め係合部
１２ｂ 回動規制部
１３ スイベル架台
１４ スイベルジョイント
１５ ホース（流体物供給配管）
２０ 管状杭
２１ 杭側抜け止め係合部
２２ パイプ（流体物供給配管）
２３ ホース（流体物供給配管）
２４ 吊り用連結部
３０ 杭圧入機
３１ サドル
３２ クランプ装置
３３ スライドベース
３４ マスト
３５ 昇降機構
３６ チャック装置
４０ 打ち下げ装置（第１実施形態）
４１ クランプ装置
４２ 吊り用連結部
４３ 天秤 2 Distribution suspension wire 3 Separate wire 4 Hose (fluid supply pipe)
9 Suspension wire 10 Lowering device (second embodiment)
DESCRIPTION OF SYMBOLS 11 Main body 11a Upper part 11b Lower end part 12 Locking | fitting prevention locking | engagement part 12a Decline apparatus side locking | fitting prevention engagement part 12b Turning control part 13 Swivel mount 14 Swivel joint 15 Hose (fluid supply pipe)
20 Tubular pile 21 Pile side retaining engagement part 22 Pipe (fluid supply piping)
23 Hose (fluid supply piping)
24 Connecting part 30 for hanging 30 Pile presser 31 Saddle 32 Clamp device 33 Slide base 34 Mast 35 Lifting mechanism 36 Chuck device 40 Lowering device (first embodiment)
41 Clamping Device 42 Suspension Connection 43 Balance

Claims (6)

管状杭の上端部を把持するクランプ装置と、管状杭を把持するチャック装置と、前記チャック装置を前記クランプ装置に対して昇降させる昇降機構とを備えた杭圧入機を用いて、地盤に圧入された既設の管状杭を前記クランプ装置で把持して当該既設の管状杭から反力を取り、新たな管状杭を前記チャック装置で把持して地盤に圧入する管状杭の圧入方法であって、
前記新たな管状杭の上端部に、円筒状の本体を有した打ち下げ装置の下端部を挿し込んだ状態で接続手段により接続するととともに、流体物供給配管を前記打ち下げ装置の内部を通して設置する第１工程と、
前記新たな管状杭及び前記打ち下げ装置を吊り上げ、前記新たな管状杭を前記チャック装置に把持させた状態に建て込む第２工程と、
前記流体供給配管を通して流体物を前記新たな管状杭の先端部の圧入に抗する地盤に吐出しながら前記杭圧入機を動作させ、前記チャック装置の把持位置に前記打ち下げ装置が下がるまで前記新たな管状杭を打ち下げて地盤に圧入する第３工程と、を以上の記載の順序で備える管状杭の圧入方法。 It is press-fitted into the ground using a pile presser equipped with a clamp device for gripping the upper end of the tubular pile, a chuck device for gripping the tubular pile, and an elevating mechanism for moving the chuck device up and down relative to the clamp device. It is a press-fitting method of a tubular pile that grips an existing tubular pile with the clamp device and takes a reaction force from the existing tubular pile, grips a new tubular pile with the chuck device, and press-fits into the ground,
The upper end of the new tubular pile is connected by connecting means in a state where the lower end of the lowering device having a cylindrical body is inserted, and the fluid supply pipe is installed through the inside of the lowering device. The first step;
A second step of lifting the new tubular pile and the lowering device, and building the new tubular pile in a state of being gripped by the chuck device;
The pile press-in machine is operated while discharging the fluid through the fluid supply pipe to the ground that resists the press-fitting of the tip of the new tubular pile, and the new push-down device is lowered until the lowering device is lowered to the gripping position of the chuck device. A method for press-fitting a tubular pile comprising the third step of pushing down a tubular pile and press-fitting it into the ground in the order described above. 前記第２工程の吊り上げ時おいて、吊ワイヤーを前記新たな管状杭の外周面に固設された連結部にのみ連結して、前記打ち下げ装置を前記新たな管状杭による下支えのみによって支持する請求項１に記載の管状杭の圧入方法。   At the time of lifting in the second step, the suspension wire is connected only to the connection portion fixed to the outer peripheral surface of the new tubular pile, and the down-loading device is supported only by the lower support by the new tubular pile. The method for press-fitting a tubular pile according to claim 1. 前記第２工程の吊り上げ時おいて、吊ワイヤーを前記打ち下げ装置に設けられた連結部にのみ連結して、前記新たな管状杭を前記接続手段のみによって支持する請求項１に記載の管状杭の圧入方法。   2. The tubular pile according to claim 1, wherein at the time of lifting in the second step, the suspension wire is connected only to a connecting portion provided in the dropping device, and the new tubular pile is supported only by the connecting means. Press-in method. 前記第２工程の吊り上げ時おいて、吊ワイヤーを前記打ち下げ装置に設けられた連結部にのみ連結するとともに、前記打ち下げ装置と前記新たな管状杭とを別ワイヤーにより連結して、前記別ワイヤーを、前記新たな管状杭が前記打ち下げ装置から分離しないように作用させる請求項１に記載の管状杭の圧入方法。   At the time of lifting in the second step, the suspension wire is connected only to the connecting portion provided in the lowering device, and the lowering device and the new tubular pile are connected by another wire, The method of press-fitting a tubular pile according to claim 1, wherein the wire is operated so that the new tubular pile is not separated from the driving device. 前記第２工程の吊り上げ時おいて、吊ワイヤーを、天秤を介して前記打ち下げ装置に設けられた連結部に連結するとともに、同天秤を、分配吊ワイヤーを介して前記新たな管状杭の外周面に固設された連結部に連結して、前記新たな管状杭を前記接続手段及び前記分配吊ワイヤーによって支持する請求項１に記載の管状杭の圧入方法。   At the time of lifting in the second step, the suspension wire is connected to a connecting portion provided in the lowering device via a balance, and the balance is connected to the outer periphery of the new tubular pile via a distribution suspension wire. The method for press-fitting a tubular pile according to claim 1, wherein the tubular pile is supported by the connecting means and the distribution suspension wire by being connected to a connecting portion fixed to a surface. 円筒状の本体を有する打ち下げ装置の下端部を、管状杭の上端部に挿し込んだ状態で接続する打ち下げ装置と管状杭との接続構造であって、
前記下端部の外周部に打ち下げ装置側抜け止め係合部が設けられ、
前記管状杭の内周部に杭側抜け止め係合部が設けられ、
前記下端部が前記管状杭に挿し込まれた後前記管状杭に対して相対的に回動することで、前記打ち下げ装置側抜け止め係合部が前記杭側抜け止め係合部の下側に配置されて前記打ち下げ装置が前記管状杭から抜けることを阻止するように係合可能にされた打ち下げ装置と管状杭との接続構造。 A connection structure between the lowering device and the tubular pile connected to the lower end of the lowering device having a cylindrical main body in a state of being inserted into the upper end of the tubular pile,
A lowering device side retaining engagement portion is provided on the outer peripheral portion of the lower end portion,
A pile side retaining engagement portion is provided on the inner periphery of the tubular pile,
After the lower end portion is inserted into the tubular pile, it rotates relative to the tubular pile so that the lowering device side retaining engagement portion is below the pile side retaining engagement portion. A connection structure between the lowering device and the tubular pile arranged to be engaged so as to prevent the lowering device from coming off the tubular pile.
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