JP2013142271A - Steel pipe sheet pile press-in method and press-in device - Google Patents

Steel pipe sheet pile press-in method and press-in device Download PDF

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JP2013142271A
JP2013142271A JP2012003909A JP2012003909A JP2013142271A JP 2013142271 A JP2013142271 A JP 2013142271A JP 2012003909 A JP2012003909 A JP 2012003909A JP 2012003909 A JP2012003909 A JP 2012003909A JP 2013142271 A JP2013142271 A JP 2013142271A
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steel pipe
sheet pile
casing
pipe sheet
press
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JP5952563B2 (en
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Sadayoshi Yamauchi
定義 山内
Hideaki Okada
英明 岡田
Kazuo Yamazaki
一雄 山崎
Yusuke Tanaka
祐介 田中
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Penta Ocean Construction Co Ltd
Sanwa Kizai Co Ltd
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Sanwa Kizai Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To solve the problems that noise or vibrations are generated at work site by a conventional installation method and that a steel pipe sheet pile cannot be pressed into hard soil since a press-in pressure during installation is limited by a conventional static pressure press-in construction method.SOLUTION: In a steel pipe sheet pile press-in method, a casing provided with an excavation body positioned at a lower peripheral edge is inserted from an upper part to an inner side of a steel pipe sheet pile having a joint on an outer periphery, a chuck device fixing an upper part of the casing is driven and rotated by a rotational drive unit, soil is dug and loosened by the excavation body of the casing while leaving sediment inside the casing, and the steel pipe sheet pile is pressed into the soil dug and loosened by the excavation body.

Description

本発明は、外周に継ぎ手を設けた鋼管矢板の圧入方法および圧入装置に係るものである。   The present invention relates to a method for press-fitting a steel pipe sheet pile having a joint on the outer periphery and a press-fitting device.

従来、継ぎ手を設けた鋼管矢板の上部を叩いて行う打設工法は、公知である(特許文献1)。
また、従来、ケーシング内に掘削ヘッドを挿入し、この掘削ヘッドによりケーシング内を掘削排土し、このケーシングの外周の鋼管矢板を地盤に静圧圧入する中掘圧入工法は、公知である(特許文献2)。
Conventionally, a placing method that is performed by hitting an upper portion of a steel pipe sheet pile provided with a joint is known (Patent Document 1).
Conventionally, a medium digging press method in which a digging head is inserted into a casing, the inside of the casing is excavated and discharged by the excavating head, and a steel pipe sheet pile on the outer periphery of the casing is statically pressed into the ground (patented) Reference 2).

特開2011ー202450号公報JP 2011-202450 A 特開2004−11102号公報JP 2004-11102 A

公知例のうちの前者の打設工法では、作業現場における騒音あるいは振動の発生という課題がある。
前記公知例のうち中掘静圧圧入工法では、打設に際する圧入圧力には限界があるので、硬質地盤では鋼管矢板を圧入できないという課題がある。
また、公知の中掘圧入工法では、ケーシング内を掘削により発生した残土を排出処理が必要となるという課題がある。
残土の処理は、大変であり、費用が嵩み、鋼管矢板の設置コストを上昇させる。
本願は、鋼管矢板を圧入する方法を工夫し、掘削残土を発生させずに、硬質地盤での鋼管矢板の圧入作業も可能にするようにしたものである。
Among the known examples, the former placement method has a problem of generation of noise or vibration at a work site.
Among the known examples, the medium digging hydrostatic press fitting method has a problem that the steel pipe sheet pile cannot be press-fitted in hard ground because the press-fit pressure at the time of placing is limited.
Moreover, in the known medium digging press-fitting method, there is a problem that the residual soil generated by excavation in the casing needs to be discharged.
The treatment of the remaining soil is difficult, expensive, and increases the installation cost of the steel pipe sheet pile.
In this application, a method of press-fitting a steel pipe sheet pile is devised to enable the press-fitting work of a steel pipe sheet pile on a hard ground without generating excavation residual soil.

請求項1の発明は、外周に継ぎ手を有する鋼管矢板の内側に、下部周縁に位置する掘削体を設けたケーシングを上方から挿入し、ケーシングの上部を固定しているチャック装置を回転駆動装置により駆動回転させて、ケーシング内に土砂を残したままケーシングの掘削体で地盤を掘緩め、掘削体で掘緩めた地盤に前記鋼管矢板を圧入する鋼管矢板圧入方法としたものである。
請求項2の発明は、前記掘削体を、ケーシングの周縁下方から鋼管矢板の周縁下方にかけて移動させて、鋼管矢板の周縁下方の掘削体で地盤を掘緩め、掘削体で掘緩めた地盤に前記鋼管矢板を圧入する鋼管矢板圧入方法としたものである。
請求項3の発明は、前記鋼管矢板の周縁下方に位置する前記掘削体を、前記継ぎ手の下方部分にて、放射方向の外側へ移動させて、掘削体で継ぎ手の下方の地盤を掘緩め、継ぎ手の下方の地盤を掘緩めた後、次の継ぎ手の下方に至る間、鋼管矢板の周縁下方に掘削体を退避させて、鋼管矢板および継ぎ手の下方の地盤だけを掘緩め、掘削体で掘緩めた地盤に前記鋼管矢板を圧入する鋼管矢板圧入方法としたものである。
請求項4の発明は、ケーシングの下部周縁の所定位置に、該ケーシングの放射方向に出入り自在に設けられた掘削体と、
前記ケーシングの上部内周にチャックするチャック装置と、
該チャック装置に接続して前記ケーシングを前記掘削体と共に駆動回転する回転駆動装置と、
前記ケーシングの外周に嵌合させる、外周に継ぎ手を有する鋼管矢板と、
該鋼管矢板の下部をチャックする鋼管用チャック装置および鋼管矢板を圧入する鋼管圧入用シリンダを有する圧入装置とからなる鋼管矢板圧入装置としたものである。
請求項5の発明は、前記掘削体は、前記ケーシングの下部内周に設けた取付部に軸により回動自在に取付けると共に、前記ケーシングに設けた出入り用シリンダにより前記ケーシングの周縁内側下方から前記継ぎ手の下方まで進退させる構成とした鋼管矢板圧入装置としたものである。
請求項6の発明は、前記回転駆動装置は、前記ケーシング内に挿入しうる外径で構成すると共に、前記チャック装置と一体状の構成とした鋼管矢板圧入装置としたものである。
請求項7の発明は、前記回転駆動装置は、前記ケーシングの上部に装着し、回転駆動装置の回転出力軸により前記ケーシングの上部内周にチャックしたチャック装置ごと前記ケーシングを駆動回転させる構成とした鋼管矢板圧入装置。
請求項8の発明は、
前記出入り用シリンダおよび前記回転駆動装置は、前記掘削体を前記継ぎ手の下方部分でだけ放射方向に進退させて地盤を掘緩める構成とした鋼管矢板圧入装置としたものである。
According to the first aspect of the present invention, a casing provided with an excavating body located at the lower peripheral edge is inserted from above into a steel pipe sheet pile having a joint on the outer periphery, and a chuck device for fixing the upper portion of the casing is A steel pipe sheet pile press-in method in which the steel pipe sheet pile is press-fitted into the ground that has been driven and rotated to loosen the ground with the excavated body of the casing while leaving the earth and sand in the casing and is loosened with the excavated body.
In the invention of claim 2, the excavation body is moved from the lower peripheral edge of the casing to the lower peripheral edge of the steel pipe sheet pile, and the ground is dug and loosened by the excavation body below the peripheral edge of the steel pipe sheet pile. This is a steel pipe sheet pile press-in method for press-fitting a steel pipe sheet pile.
In the invention of claim 3, the excavation body located below the peripheral edge of the steel pipe sheet pile is moved radially outward at the lower portion of the joint, and the ground below the joint is loosened by the excavation body, After digging and loosening the ground below the joint, the drilling body is evacuated below the periphery of the steel pipe sheet pile until reaching the next joint, and only the ground below the steel pipe sheet pile and joint is digging and digging with the drilling body. The steel pipe sheet pile press-in method is used to press-fit the steel pipe sheet pile into the loosened ground.
The invention according to claim 4 is a drilling body provided at a predetermined position on the lower peripheral edge of the casing so as to freely enter and exit in the radial direction of the casing;
A chuck device for chucking the upper inner periphery of the casing;
A rotary drive device connected to the chuck device to drive and rotate the casing together with the excavation body;
A steel pipe sheet pile having a joint on the outer periphery, fitted to the outer periphery of the casing,
A steel pipe sheet pile press-in apparatus comprising a steel pipe chuck apparatus for chucking the lower part of the steel pipe sheet pile and a press-in apparatus having a steel pipe press-in cylinder for press-fitting the steel pipe sheet pile.
According to a fifth aspect of the present invention, the excavated body is rotatably attached to an attachment portion provided on the lower inner periphery of the casing by a shaft, and the entry / exit cylinder provided on the casing is used to insert the excavation body from below the inner periphery of the casing. It is a steel pipe sheet pile press-fitting device configured to advance and retract to the lower part of the joint.
The invention according to claim 6 is a steel pipe sheet pile press-fitting device in which the rotational drive device is configured with an outer diameter that can be inserted into the casing and is configured integrally with the chuck device.
According to a seventh aspect of the invention, the rotary drive device is mounted on the upper portion of the casing, and the casing is driven and rotated together with the chuck device chucked on the inner periphery of the upper portion of the casing by the rotation output shaft of the rotary drive device. Steel pipe sheet pile press-fitting device.
The invention of claim 8
The entry / exit cylinder and the rotary drive device are steel pipe sheet pile press-in devices configured to move the excavation body forward and backward in the radial direction only at the lower part of the joint to dig and loosen the ground.

請求項1の発明では、ケーシング4内に土砂を残したまま、ケーシング4の周縁下方を掘削体3で掘緩めているので、掘削残土を発生させずに鋼管矢板2を圧入でき、しかも、ケーシング4の周縁下方は掘削体3で掘緩められているから、鋼管矢板2の圧入圧力も従来に比し低くでき、圧入作業を容易にできるだけでなく、硬質地盤の作業も可能となって、作業可能範囲を広げることができる。
請求項2の発明では、鋼管矢板2の周縁下方を掘削体3で掘緩めているので、一層、硬質地盤の作業も可能となって、作業可能範囲を広げることができる。
請求項3の発明では、鋼管矢板2の周縁下方を掘削体3で掘緩めると共に、継ぎ手1の下方の地盤を掘緩めるので、一層、硬質地盤の作業も可能となって、作業可能範囲を広げることができる。さらに、鋼管矢板2および継ぎ手1の下方の地盤のみを掘緩めるので、鋼管矢板2の外周辺の地盤強度を低下させず、鋼管矢板2の水平方向の荷重に対する支持剛性を低下させることがない。
請求項4の発明では、ケーシング4内の土砂を残したまま鋼管矢板2の周縁下方を掘削体3で掘緩めているので、掘削残土を発生させずに鋼管矢板2を圧入でき、しかも、鋼管矢板2の周縁下方は掘削体3で掘緩められているから、硬質地盤の作業も従来に比し硬い地盤での作業も可能となり、作業可能範囲を広げることができる。
請求項5の発明では、掘削体3の進退機構を簡単に構成でき、故障あるいは破損を防止でき、作業効率を向上させることができる。
請求項6の発明では、ケーシング4内に回転駆動装置20とチャック装置22を設けているので、周辺作業スペースを広くでき、狭い作業現場での作業も可能にできる。
請求項7の発明では、ケーシング4の上部に汎用的に普及している回転駆動装置20を配置して、ケーシング4を駆動回転させることもできるので、ケーシング4の内径の制限を受けずに回転駆動装置20を選択装着でき、装置コストを低減できる。
請求項8の発明では、継ぎ手1の下方部分のみを掘緩めるので、周辺の地盤強度を低下させず、鋼管矢板2の水平方向の荷重に対する支持剛性を低下させることがない。
According to the first aspect of the present invention, since the excavator 3 loosens the lower periphery of the casing 4 while leaving the earth and sand in the casing 4, the steel pipe sheet pile 2 can be press-fitted without generating excavated soil, and the casing Since the lower part of the peripheral edge of 4 is loosened by the excavating body 3, the press-fitting pressure of the steel pipe sheet pile 2 can be lowered as compared with the conventional one, not only can the press-fitting work be facilitated, but also the hard ground can be worked. The possible range can be expanded.
In the invention of claim 2, since the lower part of the peripheral edge of the steel pipe sheet pile 2 is loosened by the excavating body 3, the work of the hard ground can be further performed and the workable range can be expanded.
In the invention of claim 3, since the lower part of the peripheral edge of the steel pipe sheet pile 2 is dug loosened by the excavating body 3 and the ground below the joint 1 is dug loosened, the work of the hard ground can be further performed and the workable range is expanded. be able to. Furthermore, since only the ground below the steel pipe sheet pile 2 and the joint 1 is dug and loosened, the ground strength of the outer periphery of the steel pipe sheet pile 2 is not lowered, and the support rigidity of the steel pipe sheet pile 2 against the horizontal load is not lowered.
In the invention of claim 4, since the excavator 3 loosens the lower periphery of the steel pipe sheet pile 2 while leaving the earth and sand in the casing 4, the steel pipe sheet pile 2 can be press-fitted without generating residual excavation, and the steel pipe Since the bottom of the sheet pile 2 has been dug loosened by the excavated body 3, the work on the hard ground can be performed on the hard ground compared to the conventional one, and the workable range can be expanded.
In the invention of claim 5, the advancing / retreating mechanism of the excavated body 3 can be configured easily, failure or breakage can be prevented, and work efficiency can be improved.
In the invention of claim 6, since the rotary drive device 20 and the chuck device 22 are provided in the casing 4, the peripheral work space can be widened, and work in a narrow work site can also be made possible.
In the invention of claim 7, the rotation drive device 20 that is widely used can be arranged on the upper part of the casing 4 to drive and rotate the casing 4, so that the rotation can be performed without being limited by the inner diameter of the casing 4. The drive device 20 can be selectively mounted, and the device cost can be reduced.
In the invention of claim 8, since only the lower part of the joint 1 is dug and loosened, the surrounding ground strength is not lowered, and the support rigidity against the horizontal load of the steel pipe sheet pile 2 is not lowered.

鋼管矢板圧入装置の側面図。The side view of a steel pipe sheet pile press-fitting device. 設置済み鋼管矢板の平面図。The top view of the installed steel pipe sheet pile. 回転駆動装置の側面図。The side view of a rotation drive device. 掘削体の側面図。The side view of a drilling body. 圧入装置の側面図。The side view of a press-fit apparatus. 同概略平面図。FIG. 圧入作業の模式図。Schematic diagram of press-fitting work. 鋼管矢板圧入装置の他の実施例の側面図。The side view of the other Example of the steel pipe sheet pile press-fitting device. 同鋼管矢板にケーシングを挿入した状態の側面図。The side view of the state which inserted the casing in the steel pipe sheet pile. 作業船に設けた鋼管矢板圧入装置の他の実施例の側面図。The side view of the other Example of the steel pipe sheet pile press-fit apparatus provided in the work ship. 同一部拡大図。The same part enlarged view.

本発明は、少なくとも、一対の継ぎ手1を有する鋼管矢板2の圧入工法に関するものであり、該圧入方法および該方法を実施する装置の例を図により説明する。
前記継ぎ手1は前記鋼管矢板2を相互に連結するものであればよく、図2に一例を示すが、継ぎ手1の形状および数等は本願の要件ではない。
鋼管矢板2の内側には下部に掘削体(掘削ビット)3を有するケーシング4を上方から挿入する。ケーシング4は、鋼管矢板2内に上方から挿入しうる外径に形成する。
The present invention relates to a method for press-fitting a steel pipe sheet pile 2 having at least a pair of joints 1, and an example of the press-fitting method and an apparatus for carrying out the method will be described with reference to the drawings.
The joint 1 only needs to connect the steel pipe sheet piles 2 to each other, and an example is shown in FIG. 2, but the shape and number of the joints 1 are not requirements of the present application.
Inside the steel pipe sheet pile 2, a casing 4 having an excavating body (excavating bit) 3 at the bottom is inserted from above. The casing 4 is formed to have an outer diameter that can be inserted into the steel pipe sheet pile 2 from above.

次に、ケーシング4を回転させることにより、掘削体3をケーシング4と一体回転させてケーシング4の周縁下方の地盤を掘緩め(掘崩し)ながら、ケーシング4を地盤に静圧圧入させる。
即ち、単に、ケーシング4を圧入すると、土砂抵抗が発生して相当の圧入圧力を必要とするが、予め、掘削体3によりケーシング4の周縁下方の地盤を掘緩めているので、圧入圧力を軽減させて圧入作業を行える。
Next, by rotating the casing 4, the excavator 3 is rotated integrally with the casing 4, and the ground under the periphery of the casing 4 is dug loosened (disintegrated), and the casing 4 is hydrostatically pressed into the ground.
That is, when the casing 4 is simply press-fitted, earth and sand resistance is generated and a considerable press-fitting pressure is required. However, since the ground below the periphery of the casing 4 is dug loosened by the excavating body 3, the press-fitting pressure is reduced. Can be press-fitted.

掘削体3は、ケーシング4の周縁下方から鋼管矢板2の周縁下方までの地盤を掘緩められるように、ケーシング4の内周よりも内側に位置する内周位置から外周を越えて鋼管矢板2の周縁下方および継ぎ手1の周縁下方までの間出入り自在構成とし、ケーシング4の周縁下方から継ぎ手1の周縁下方までの地盤を掘緩めるように構成する。   The excavated body 3 extends beyond the outer periphery from the inner peripheral position of the casing 4 to the inner periphery of the casing 4 so that the ground from the lower peripheral edge of the casing 4 to the lower peripheral edge of the steel pipe sheet pile 2 can be removed. It is configured to allow entry and exit between the lower periphery and the lower periphery of the joint 1, and the ground from the lower periphery of the casing 4 to the lower periphery of the joint 1 is dug and loosened.

この場合、継ぎ手1は鋼管矢板2の一部外周に設けられているだけであるので(図2)、前記掘削体3は、継ぎ手1の下方の部分だけを掘緩められるように構成すると、不必要に鋼管矢板2の周辺の地盤を崩さないですみ、地盤強度を低下させず、好適である。
例えば、継ぎ手1の下方手前位置から鋼管矢板2の外径を越えて継ぎ手1の下方まで突出拡大して地盤を掘緩め、継ぎ手1の下方の部分を通過すると、鋼管矢板2の外径周縁下方位置に一旦退避して掘緩め、次の、継ぎ手1の下方で突出拡大して地盤を掘緩め、これを反復する。
In this case, since the joint 1 is only provided on a part of the outer periphery of the steel pipe sheet pile 2 (FIG. 2), the excavator 3 is not suitable if only the lower part of the joint 1 is dug and loosened. The ground around the steel pipe sheet pile 2 need not be destroyed, and the ground strength is not lowered, which is preferable.
For example, when the steel pipe sheet pile 2 passes through the lower part of the joint 1 by projecting and expanding from the position before the joint 1 to the lower part of the joint 1 beyond the outer diameter of the steel pipe sheet pile 2, the lower part of the outer diameter of the steel pipe sheet pile 2 is lowered. After evacuating to the position, the digging is loosened, and the next projecting and expanding below the joint 1 is performed to loosen the ground, and this is repeated.

上記の掘削体3による掘緩めは、地盤の硬さ、湿り気等の諸条件により、鋼管矢板2とケーシング4を圧入できる程度に行うとよい。
即ち、掘削体3は、継ぎ手1と鋼管矢板2とケーシング4のそれぞれの周縁下方だけを掘緩め、ケーシング4内の土砂を排出させないでケーシング4内に残したまま、鋼管矢板2を圧入させて、鋼管矢板2内を土砂で充填することにより、鋼管矢板2の起立姿勢の耐力を向上させ、さらに、鋼管矢板2の周囲の地盤を必要以上に掘緩めずにすみ、この点でも、起立姿勢の保持強度を向上させられる。
The digging loosening by the excavating body 3 is preferably performed to such an extent that the steel pipe sheet pile 2 and the casing 4 can be press-fitted according to various conditions such as the hardness of the ground and moisture.
In other words, the excavated body 3 digs and loosens only below the peripheral edges of the joint 1, the steel pipe sheet pile 2, and the casing 4, and presses the steel pipe sheet pile 2 while leaving it in the casing 4 without discharging the earth and sand in the casing 4. By filling the steel pipe sheet pile 2 with earth and sand, the strength of the standing posture of the steel pipe sheet pile 2 is improved, and further, the ground around the steel pipe sheet pile 2 is not unnecessarily loosened. The holding strength of can be improved.

したがって、軟弱地盤で鋼管矢板2の圧入が容易な場合には、継ぎ手1に向けて掘削体3を突出させなくてもすむ場合がある一方で、硬質地盤の場合では、継ぎ手1の下方を掘削体3により掘緩めることで、鋼管矢板2の圧入作業を可能にすることがあり、掘削体3を出入りさせることで、作業範囲を広げられる。   Therefore, when it is easy to press-fit the steel pipe sheet pile 2 on soft ground, it may not be necessary to project the excavating body 3 toward the joint 1. On the other hand, in the case of hard ground, the bottom of the joint 1 is excavated. By loosening the digging with the body 3, the press-fitting work of the steel pipe sheet pile 2 may be possible, and by moving the excavating body 3 in and out, the work range can be expanded.

なお、ケーシング4による圧入掘緩め作業と、鋼管矢板2の圧入作業の順序は任意であり、ケーシング4による圧入掘緩め作業と鋼管矢板2の圧入作業とをほぼ同時に行ってもよく、また、ケーシング4による圧入掘緩め作業を鋼管矢板2の圧入作業に先行させて行ってもよい。   The order of the press-fitting and loosening work by the casing 4 and the press-fitting work of the steel pipe sheet pile 2 is arbitrary, and the press-fitting and loosening work by the casing 4 and the press-fitting work of the steel pipe sheet pile 2 may be performed almost simultaneously. 4 may be performed prior to the press-fitting work of the steel pipe sheet pile 2.

また、ケーシング4は自重および掘削体3の掘緩めで圧入させても良い。
以下、具体的に実施例を説明すると、図1において、10は地上走行車であり、走行装置(クローラ)11の上方にテーブル12を設ける。テーブル12に設けたステー14の先端にはリーダー15を装着する。リーダー15には上下動自在に上下支持部16を取付け、上下支持部16には吊設体17の上部を取付け、吊設体17の下部には回転駆動装置20を設ける。
Further, the casing 4 may be press-fitted by its own weight and digging of the excavated body 3.
Hereinafter, a specific example will be described. In FIG. 1, 10 is a ground traveling vehicle, and a table 12 is provided above a traveling device (crawler) 11. A leader 15 is attached to the tip of a stay 14 provided on the table 12. A vertical support part 16 is attached to the leader 15 so as to be movable up and down, and an upper part of a suspension body 17 is attached to the vertical support part 16, and a rotary drive device 20 is provided below the suspension body 17.

回転駆動装置20は、モーターにより構成し、回転駆動装置20の回転出力軸21は下方に突出させて、回転出力軸21によりチャック装置22を回転するように設ける。チャック装置22はチャック体23をケーシング4の内周に当接させて固定し、回転駆動装置20の駆動によりケーシング4を駆動回転させる。   The rotation drive device 20 is constituted by a motor, and a rotation output shaft 21 of the rotation drive device 20 is provided so as to protrude downward, and the chuck device 22 is rotated by the rotation output shaft 21. The chuck device 22 fixes the chuck body 23 in contact with the inner periphery of the casing 4, and drives and rotates the casing 4 by driving the rotation driving device 20.

チャック装置22の構成は、回転駆動装置20の駆動力をケーシング4に伝達するように、回転出力軸21とケーシング4を固定状態に連結させられればよい。24はチャック体23を出入りさせる楔状のガイド体、25はチャック体23を上下させるチャック用シリンダ、26はチャック用フレームであり、前記回転出力軸21に取付ける。   The configuration of the chuck device 22 may be such that the rotation output shaft 21 and the casing 4 are connected in a fixed state so that the driving force of the rotation driving device 20 is transmitted to the casing 4. Reference numeral 24 denotes a wedge-shaped guide body that allows the chuck body 23 to enter and exit, 25 denotes a chuck cylinder that moves the chuck body 23 up and down, and 26 denotes a chuck frame that is attached to the rotary output shaft 21.

前記ケーシング4の下部には、掘削体3を放射方向に出入り自在に設ける。掘削体3はケーシング4の下部内周に設けた取付部28に軸29により回動自在に取付ける。掘削体3には出入り用シリンダ30のロッド31を取付け、出入り用シリンダ30の上部はケーシング4の内周に設けたシリンダ取付部32に固定状態に取付ける。   At the lower part of the casing 4, the excavated body 3 is provided so as to freely enter and exit in the radial direction. The excavated body 3 is attached to an attachment portion 28 provided on the lower inner periphery of the casing 4 so as to be rotatable by a shaft 29. The rod 31 of the entry / exit cylinder 30 is attached to the excavation body 3, and the upper part of the entry / exit cylinder 30 is attached to a cylinder attachment portion 32 provided on the inner periphery of the casing 4 in a fixed state.

掘削体3はケーシング4の下端周縁の下方の地盤を掘削するのに必要な強度を確保しつつ、ケーシング4の直径方向の厚さおよび回転方向の幅を小さく形成する。
即ち、掘削体3が、不必要に鋼管矢板2の周辺の地盤を崩さないようにすると共に、鋼管矢板2内に土砂を残して排土工程を省略するために、小型に形成する。
The excavation body 3 is formed with a small thickness in the diameter direction and a width in the rotation direction of the casing 4 while ensuring the strength necessary for excavating the ground below the lower edge of the casing 4.
That is, the excavating body 3 is formed in a small size so that the ground around the steel pipe sheet pile 2 is not unnecessarily destroyed and the earth and sand are left in the steel pipe sheet pile 2 to omit the earth removal step.

前記リーダー15の下部には、鋼管矢板2を圧入する圧入装置40を設ける。圧入装置40は四角枠形状の支持フレーム41に支脚42を設けて地盤上に設置する。支持フレーム41は左右の左右フレーム43と前後フレーム44とにより構成する。   A press-fitting device 40 for press-fitting the steel pipe sheet pile 2 is provided below the leader 15. The press-fitting device 40 is installed on the ground by providing a support leg 42 on a support frame 41 having a square frame shape. The support frame 41 includes left and right left and right frames 43 and front and rear frames 44.

前記支持フレーム41には、鋼管矢板2を固定する鋼管用チャック装置50を設ける。鋼管用チャック装置50はチャック用フレーム51に鋼管矢板2の外周に当接させて固定するチャック体52を設ける。53はチャック体52を出入りさせる楔状のガイド体、54はチャック体52を上下させるチャック用シリンダである。
55は鋼管用チャック装置50を上下させる鋼管圧入用シリンダであり、シリンダフレーム56に吊設している。
The support frame 41 is provided with a steel pipe chuck device 50 for fixing the steel pipe sheet pile 2. The steel pipe chuck device 50 is provided with a chuck body 52 which is fixed to the chuck frame 51 by being brought into contact with the outer periphery of the steel pipe sheet pile 2. Reference numeral 53 denotes a wedge-shaped guide body that allows the chuck body 52 to enter and exit, and 54 denotes a chuck cylinder that moves the chuck body 52 up and down.
Reference numeral 55 denotes a steel pipe press-fitting cylinder that moves the steel pipe chuck device 50 up and down, and is suspended from a cylinder frame 56.

鋼管圧入用シリンダ55は、チャック用フレーム51を下降させると、鋼管矢板2を圧入させるが、鋼管矢板2を装着していない状態で、チャック用フレーム51を上昇させると、支持フレーム41および支脚42ごと圧入装置40を持ち上げて、圧入装置40の運搬移動状態にする。   The steel pipe press-in cylinder 55 press-fits the steel pipe sheet pile 2 when the chuck frame 51 is lowered. However, when the chuck frame 51 is raised without the steel pipe sheet pile 2 attached, the support frame 41 and the support leg 42 are provided. The press-fitting device 40 is lifted together to bring the press-fitting device 40 into a transporting movement state.

図8、図9は他の実施例であり、前記回転駆動装置20のチャック装置22をケーシング4の上部に挿入してチャックし、ケーシング4を回動させるものである。
60はペンダントロープであり、リーダー15を水平状態から起立させるときに使用する。61は回転駆動部吊りワイヤーである。
FIGS. 8 and 9 show another embodiment, in which the chuck device 22 of the rotary drive device 20 is inserted into the upper portion of the casing 4 for chucking, and the casing 4 is rotated.
Reference numeral 60 denotes a pendant rope, which is used when the leader 15 is raised from a horizontal state. 61 is a rotation drive part suspension wire.

また、鋼管矢板2内の土砂を排出させないで残したまま圧入させることを前提とするので、回転駆動装置20がケーシング4の上部に載置されるようにチャック装置22をケーシング4の上部に挿入してチャックし、同様に、回転駆動装置20も掘削体3に対して所定距離置いたケーシング4の上部所定位置の内周でチャック装置22によりチャックさせる。   Further, since it is assumed that the sand and sand in the steel pipe sheet pile 2 is left without being discharged, the chuck device 22 is inserted into the upper portion of the casing 4 so that the rotary drive device 20 is placed on the upper portion of the casing 4. Similarly, the rotary drive device 20 is also chucked by the chuck device 22 at the inner periphery of the upper portion of the casing 4 at a predetermined distance from the excavated body 3.

図10、図11は他の実施例であり、作業船65に前記テーブル12を設け、テーブル12に設けたステー14の先端にはリーダー15を装着し、リーダー15にはケーシング4の回転駆動装置20を設ける。
また、リーダー15の下部には鋼管矢板2を圧入する圧入装置40を設けている。
10 and 11 show another embodiment, in which the table 12 is provided on the work boat 65, a leader 15 is attached to the tip of the stay 14 provided on the table 12, and the rotation drive device for the casing 4 is attached to the leader 15. 20 is provided.
A press-fitting device 40 for press-fitting the steel pipe sheet pile 2 is provided below the leader 15.

(実施例の作用)
地上走行車10あるいは作業船65により圧入装置40を鋼管矢板2の設置現場に運搬し、この圧入装置40の鋼管用チャック装置50に別途用意したクレーン(図示省略)により鋼管矢板2を吊設しながら装着してチャック固定する。
(Operation of Example)
The press fitting device 40 is transported to the installation site of the steel pipe sheet pile 2 by the ground traveling vehicle 10 or the work boat 65, and the steel pipe sheet pile 2 is suspended by a crane (not shown) separately prepared in the steel pipe chuck device 50 of the press fitting device 40. Mount it while fixing the chuck.

次に、図示しないクレーンにより回転駆動装置20およびチャック装置22を吊設して上方からケーシング4内に挿入する。   Next, the rotary drive device 20 and the chuck device 22 are suspended by a crane (not shown) and inserted into the casing 4 from above.

次に、ケーシング4の上部に、チャック装置22により回転駆動装置20とケーシング4とを固定状態にして回転駆動装置20の駆動力が伝達されるようにする。
次に、鋼管矢板2の上方から回転駆動装置20を装着したケーシング4を挿入する。
Next, the rotary drive device 20 and the casing 4 are fixed to the upper portion of the casing 4 by the chuck device 22 so that the driving force of the rotary drive device 20 is transmitted.
Next, the casing 4 equipped with the rotation drive device 20 is inserted from above the steel pipe sheet pile 2.

なお、ケーシング4の鋼管矢板2への挿入と、ケーシング4への回転駆動装置20の装着順序は問わない。
ケーシング4の下部には掘削体3を設けているので、回転駆動装置20によりケーシング4を回転させると、掘削体3が回転してケーシング4の周縁下方の地盤を掘緩め(掘崩し)る。
即ち、予め、掘削体3によりケーシング4の周縁下方の地盤を掘緩めているので、通常の静圧圧入作業に比し、ケーシング4を容易に圧入させられる。
Note that the insertion order of the casing 4 into the steel pipe sheet pile 2 and the mounting order of the rotary drive device 20 to the casing 4 are not limited.
Since the excavation body 3 is provided in the lower part of the casing 4, when the casing 4 is rotated by the rotation driving device 20, the excavation body 3 rotates to dig up (crush) the ground below the periphery of the casing 4.
That is, since the ground below the periphery of the casing 4 is dug and loosened by the excavating body 3 in advance, the casing 4 can be easily press-fitted as compared with a normal hydrostatic press-fitting operation.

なお、ケーシング4の圧入と並行して鋼管矢板2の圧入作業を行うが、理解を容易にするため、先ず、ケーシング4の圧入作業について説明する。   In addition, although the press-fitting work of the steel pipe sheet pile 2 is performed in parallel with the press-fitting of the casing 4, the press-fitting work of the casing 4 will be described first for easy understanding.

掘削体3は、ケーシング4の周縁下方の地盤を掘緩められるように、ケーシング4の下端周縁下方に位置させると共に、ケーシング4の外周面を越えた外側部分まで出入り自在に取り付けられているから、掘削体3は地盤の状態に応じてケーシング4の内側周縁下方からケーシング4の外周面を越えた外側部分まで出入り(進退)させて、地盤を掘緩める。
即ち、従来の中掘圧入工法では、ケーシング4の内周内側部分だけを掘削しているから、ケーシング4の内周内側部分には地盤は存在しないが、ケーシング4の周縁下方には地盤が存在し、このケーシング4の周縁下方の地盤の存在により圧入抵抗が増大して圧入できないことがあるが、このような作業現場でも、本願では、予め、掘削体3によりケーシング4の下端周縁下方の地盤を掘緩めることにより、ケーシング4(鋼管矢板2)の圧入作業を可能にする。
Since the excavated body 3 is positioned below the lower peripheral edge of the casing 4 so that the ground below the peripheral edge of the casing 4 can be loosened, the excavated body 3 is attached to the outer portion beyond the outer peripheral surface of the casing 4 so as to freely enter and exit. The excavation body 3 moves in and out (advances and retreats) from the lower part of the inner peripheral edge of the casing 4 to the outer part beyond the outer peripheral surface of the casing 4 according to the state of the ground, thereby loosening the ground.
That is, in the conventional medium digging press-fitting method, only the inner peripheral inner portion of the casing 4 is excavated, so that there is no ground in the inner peripheral inner portion of the casing 4, but there is ground in the lower periphery of the casing 4. However, the presence of the ground below the peripheral edge of the casing 4 may increase the press-fit resistance and the press-fit cannot be performed. However, even in such a work site, the ground below the peripheral edge of the lower end of the casing 4 is preliminarily used by the excavator 3 in this application. The press-in operation of the casing 4 (steel pipe sheet pile 2) is made possible by digging up.

また、ケーシング4内の土砂を排出させないで圧入するので、後述する鋼管矢板2内には土砂が残り、鋼管矢板2には内周と外周から土砂抵抗によって支持された状態で起立することになって、特に水平方向からの荷重に対する起立姿勢の耐力を向上させられる。   Moreover, since the earth and sand in the casing 4 are pressed in without discharging, the earth and sand remain in the steel pipe sheet pile 2 to be described later, and the steel pipe sheet pile 2 stands up in a state supported by earth and sand resistance from the inner periphery and outer periphery. In particular, the proof strength of the standing posture against the load from the horizontal direction can be improved.

掘削体3は、ケーシング4の下部内周に設けた取付部28に軸29により回動自在に取付け、掘削体3には出入り用シリンダ30のロッド31を取付け、出入り用シリンダ30の上部はケーシング4の内周に固定状態に取付けているので、出入り用シリンダ30のロッド31を縮小させると、掘削体3は突出し、出入り用シリンダ30のロッド31を伸長させると、掘削体3は引っ込む。   The excavation body 3 is rotatably attached to a mounting portion 28 provided on the lower inner periphery of the casing 4 by a shaft 29, and the rod 31 of the access cylinder 30 is attached to the excavation body 3, and the upper portion of the access cylinder 30 is a casing. Since the rod 31 of the entry / exit cylinder 30 is contracted, the excavation body 3 protrudes, and when the rod 31 of the entry / exit cylinder 30 is extended, the excavation body 3 retracts.

次に、ケーシング4の圧入と同時あるいは圧入後に、鋼管矢板2を圧入装置40により圧入する。
このとき、例えば、地盤がそれほど硬くないときには、ケーシング4の周縁下方を掘削体3で地盤を掘緩めた後に、圧入装置40で鋼管矢板2を圧入する。
Next, the steel pipe sheet pile 2 is press-fitted by the press-fitting device 40 simultaneously with or after the press-fitting of the casing 4.
At this time, for example, when the ground is not so hard, the steel pipe sheet pile 2 is press-fitted by the press-fitting device 40 after digging and loosening the ground below the peripheral edge of the casing 4 with the excavating body 3.

また、地盤が硬く鋼管矢板2を圧入できないときには、掘削体3を、ケーシング4の周縁下方から鋼管矢板2の周縁下方にまで出入り用シリンダ30により突出移動させて、回転駆動装置20によりケーシング4ごと掘削体3を駆動回転させて、鋼管矢板2の周縁下方の地盤を掘緩めてから、鋼管矢板2を圧入する。   Further, when the ground is hard and the steel pipe sheet pile 2 cannot be press-fitted, the excavated body 3 is protruded and moved from the lower peripheral edge of the casing 4 to the lower peripheral edge of the steel pipe sheet pile 2 by the entrance / exit cylinder 30, and the rotary drive device 20 The excavated body 3 is driven and rotated to dig up and loosen the ground below the periphery of the steel pipe sheet pile 2 and then press-fit the steel pipe sheet pile 2.

また、地盤が硬く鋼管矢板2の圧入の際に、継ぎ手1が変形破損の虞があるときは、掘削体3を継ぎ手1の下方まで移動させて地盤を掘緩めてから、圧入する。
この場合、継ぎ手1の位置を予め設定し、鋼管矢板2の全周の地盤を掘緩めずに、継ぎ手1の下方部分手前にて、放射方向の外側に掘削体3を突出移動させて駆動回転させて、継ぎ手1の下方の地盤だけを掘緩め、一旦、鋼管矢板2の内周内側に退避させ、次の継ぎ手1の下方までケーシング4を回転させ、継ぎ手1の下方部分手前にて、放射方向の外側に掘削体3を突出移動させて掘緩め、これを反復して、鋼管矢板2を圧入すると、不必要な掘緩め作業を不要とし、地盤強度を低下さず、好適である。
Further, when the joint 1 is likely to be deformed and damaged when the steel pipe sheet pile 2 is press-fitted due to the hard ground, the excavator 3 is moved below the joint 1 and the ground is dug and loosened, and then press-fitted.
In this case, the position of the joint 1 is set in advance, and the excavated body 3 is projected and moved to the outside in the radial direction in front of the lower portion of the joint 1 without digging and loosening the ground around the entire circumference of the steel pipe sheet pile 2. Then, only the ground below the joint 1 is dug and loosened, temporarily retracted to the inner periphery of the steel pipe sheet pile 2, the casing 4 is rotated to the lower part of the next joint 1, and the radiation is emitted before the lower part of the joint 1 If the excavating body 3 is protruded and moved to the outside in the direction to loosen the digging, and this is repeated and the steel pipe sheet pile 2 is press-fitted, unnecessary digging and loosening work is not required, and the ground strength is not lowered.

さらに、掘削体3による掘り緩め方法は任意であり、地盤の状態によって掘削体3の出入り位置と回転数とケーシング4の下降速度を変更させて行う。
したがって、鋼管矢板2および/または継ぎ手1の周縁下方を掘削体3を一回転のみならず複数回回転させたり、あるいは、鋼管矢板2および/または継ぎ手1の周縁下方で掘削体3を正逆回転させて、掘緩めてもよい。
Furthermore, the digging loosening method by the excavation body 3 is arbitrary, and is performed by changing the entry / exit position and the rotational speed of the excavation body 3 and the descending speed of the casing 4 according to the ground state.
Therefore, the excavator 3 is rotated not only once but also a plurality of times below the periphery of the steel pipe sheet pile 2 and / or the joint 1, or the excavator 3 is rotated forward and backward below the periphery of the steel pipe sheet pile 2 and / or the joint 1. You may let it loosen.

前記鋼管矢板2の圧入は、鋼管矢板2の外周を圧入装置40のチャック用シリンダ54を縮小させてチャック体52を下降させてチャックし、この状態で、鋼管圧入用シリンダ55を伸長させて圧入させ、所定距離下降させると、圧入装置40のチャック体52は鋼管矢板2を一旦離し、鋼管矢板2の上の部分をチャックして圧入し、これを反復する。
この場合、鋼管矢板2の下端位置と掘削体3との上下関係は任意であるが、継ぎ手1の下方に掘削体3が位置するときには、鋼管矢板2を掘削体3の深さまで圧入せず、継ぎ手1と掘削体3との当接は回避して、破損を防止するように、出入り用シリンダ30および鋼管圧入用シリンダ55を制御する。
The steel pipe sheet pile 2 is pressed into the outer periphery of the steel pipe sheet pile 2 by reducing the chuck cylinder 54 of the press-fitting device 40 and lowering the chuck body 52, and in this state, the steel pipe press-fit cylinder 55 is extended to press-fit. The chuck body 52 of the press-fitting device 40 once releases the steel pipe sheet pile 2, chucks and presses the portion above the steel pipe sheet pile 2, and repeats this.
In this case, the vertical relationship between the lower end position of the steel pipe sheet pile 2 and the excavation body 3 is arbitrary, but when the excavation body 3 is positioned below the joint 1, the steel pipe sheet pile 2 is not press-fitted to the depth of the excavation body 3. The entrance / exit cylinder 30 and the steel pipe press-in cylinder 55 are controlled so as to avoid contact between the joint 1 and the excavated body 3 and to prevent breakage.

鋼管矢板2を所定深さまで圧入すると、ケーシング4ごと回転駆動装置20を吊り上げる。   When the steel pipe sheet pile 2 is press-fitted to a predetermined depth, the rotary drive device 20 is lifted together with the casing 4.

次に、鋼管圧入用シリンダ55によりチャック用フレーム51を上昇させて、圧入装置40全体を一旦地盤から離し、既設の鋼管矢板2の継ぎ手1に、次の鋼管矢板2の継ぎ手1を合わせられる位置の上方にまで地上走行車10あるいは作業船65により圧入装置40を移動させ、鋼管圧入用シリンダ55によりチャック用フレーム51を下降させて、圧入装置40全体を地盤上面に設置し、鋼管矢板2を圧入装置40に装着し、前記作業順序による圧入作業を反復して行う。   Next, the chuck frame 51 is lifted by the steel pipe press-in cylinder 55, the entire press-fitting device 40 is once separated from the ground, and the joint 1 of the next steel pipe sheet pile 2 is aligned with the joint 1 of the existing steel pipe sheet pile 2. The press-fitting device 40 is moved by the ground traveling vehicle 10 or the work ship 65 to the upper side, the chuck frame 51 is lowered by the steel pipe press-fitting cylinder 55, and the entire press-fitting device 40 is installed on the upper surface of the ground. It is mounted on the press-fitting device 40, and the press-fitting work according to the work order is repeated.

図8、図9の他の実施例では、回転駆動部吊りワイヤー61により回転駆動装置20のチャック装置22をケーシング4の上部に挿入してチャックし、このケーシング4を圧入装置40に装着した鋼管矢板2に上方から挿入し、鋼管矢板2内で前記したようにケーシング4および掘削体3を回転させて地盤を掘緩めて、鋼管矢板2を圧入する。
そのため、ケーシング4の上部に汎用的に普及している回転駆動装置20を配置して、ケーシング4を駆動回転させることもでき、ケーシング4の内径の制限を受けずに回転駆動装置20を選択装着でき、装置コストを低減できる。
8 and 9, the steel pipe in which the chuck device 22 of the rotation driving device 20 is inserted into the upper portion of the casing 4 by the rotation driving unit suspension wire 61 and chucked, and the casing 4 is attached to the press-fitting device 40. The steel pipe sheet pile 2 is press-fitted by inserting into the sheet pile 2 from above, rotating the casing 4 and the excavating body 3 as described above in the steel pipe sheet pile 2 to dig and loosen the ground.
Therefore, the rotation drive device 20 that is widely used can be arranged on the upper portion of the casing 4 so that the casing 4 can be driven and rotated. The rotation drive device 20 is selectively mounted without being limited by the inner diameter of the casing 4. This can reduce the device cost.

このように、予め、掘削体3により鋼管矢板2および/または継ぎ手1の周縁下方の地盤を掘緩めているので、圧入装置40による圧入する際の圧入圧力を軽減させて圧入作業を行える。   In this way, since the ground below the peripheral edge of the steel pipe sheet pile 2 and / or the joint 1 is dug loosened by the excavating body 3, the press-fitting operation can be performed while reducing the press-fitting pressure when the press-fitting device 40 is press-fitted.

1…継ぎ手、2…鋼管矢板、3…掘削体、4…ケーシング、10…地上走行車、11…クローラー、12…テーブル、14…ステー、15…リーダー、16…上下支持部、17…吊設体、20…回転駆動装置、21…回転出力軸、22…チャック装置、23…チャック体、24…ガイド体、25…チャック用シリンダ、28…取付部、29…軸、30…出入り用シリンダ、31…ロッド、40…圧入装置、41…支持フレーム、42…支脚、43…左右フレーム、44…前後フレーム、50…鋼管用チャック装置、51…チャック用フレーム、52…チャック体、54…チャック用シリンダ、55…鋼管圧入用シリンダ、56…シリンダフレーム。   DESCRIPTION OF SYMBOLS 1 ... Joint, 2 ... Steel pipe sheet pile, 3 ... Excavated body, 4 ... Casing, 10 ... Ground vehicle, 11 ... Crawler, 12 ... Table, 14 ... Stay, 15 ... Leader, 16 ... Vertical support part, 17 ... Hanging , 20 ... Rotation drive device, 21 ... Rotation output shaft, 22 ... Chuck device, 23 ... Chuck body, 24 ... Guide body, 25 ... Chuck cylinder, 28 ... Mounting portion, 29 ... Shaft, 30 ... Entrance / exit cylinder, DESCRIPTION OF SYMBOLS 31 ... Rod, 40 ... Press-fit apparatus, 41 ... Support frame, 42 ... Supporting leg, 43 ... Left and right frame, 44 ... Front and rear frame, 50 ... Steel pipe chuck device, 51 ... Chuck frame, 52 ... Chuck body, 54 ... For chuck Cylinder 55 ... Steel pipe press-fit cylinder, 56 ... Cylinder frame.

Claims (8)

外周に継ぎ手を有する鋼管矢板の内側に、下部周縁に位置する掘削体を設けたケーシングを上方から挿入し、ケーシングの上部を固定しているチャック装置を回転駆動装置により駆動回転させて、ケーシング内に土砂を残したままケーシングの掘削体で地盤を掘緩め、掘削体で掘緩めた地盤に前記鋼管矢板を圧入する鋼管矢板圧入方法。   Inside the steel pipe sheet pile having a joint on the outer periphery, a casing provided with an excavating body located at the lower peripheral edge is inserted from above, and the chuck device that fixes the upper part of the casing is driven and rotated by a rotary driving device. A steel pipe sheet pile press-in method in which the ground is excavated and loosened with a casing excavated body while leaving the earth and sand, and the steel pipe sheet pile is press-fitted into the ground loosened with the excavated body. 請求項1において、
前記掘削体を、ケーシングの周縁下方から鋼管矢板の周縁下方にかけて移動させて、鋼管矢板の周縁下方の掘削体で地盤を掘緩め、掘削体で掘緩めた地盤に前記鋼管矢板を圧入する鋼管矢板圧入方法。
In claim 1,
The steel pipe sheet pile that moves the excavated body from the lower peripheral edge of the casing to the lower peripheral edge of the steel pipe sheet pile, loosens the ground with the excavated body below the peripheral edge of the steel pipe sheet pile, and presses the steel pipe sheet pile into the ground loosened by the excavated body. Press-in method.
請求項2において、
前記鋼管矢板の周縁下方に位置する前記掘削体を、前記継ぎ手の下方部分にて、放射方向の外側へ移動させて、掘削体で継ぎ手の下方の地盤を掘緩め、継ぎ手の下方の地盤を掘緩めた後、次の継ぎ手の下方に至る間、鋼管矢板の周縁下方に掘削体を退避させて、鋼管矢板および継ぎ手の下方の地盤だけを掘緩め、掘削体で掘緩めた地盤に前記鋼管矢板を圧入する鋼管矢板圧入方法。
In claim 2,
The excavation body located below the peripheral edge of the steel pipe sheet pile is moved radially outward at the lower portion of the joint, and the excavation body loosens the ground below the joint and digs the ground below the joint. After loosening, while the lower part of the steel pipe sheet pile is moved down, the excavated body is retracted below the peripheral edge of the steel pipe sheet pile, and only the ground below the steel pipe sheet pile and the joint is dug loosened. Steel pipe sheet pile press-in method.
ケーシングの下部周縁の所定位置に、該ケーシングの放射方向に出入り自在に設けられた掘削体と、
前記ケーシングの上部内周にチャックするチャック装置と、
該チャック装置に接続して前記ケーシングを前記掘削体と共に駆動回転する回転駆動装置と、
前記ケーシングの外周に嵌合させる、外周に継ぎ手を有する鋼管矢板と、
該鋼管矢板の下部をチャックする鋼管用チャック装置および鋼管矢板を圧入する鋼管圧入用シリンダを有する圧入装置とからなる鋼管矢板圧入装置。
An excavation body provided at a predetermined position on the lower periphery of the casing so as to freely enter and exit in the radial direction of the casing;
A chuck device for chucking the upper inner periphery of the casing;
A rotary drive device connected to the chuck device to drive and rotate the casing together with the excavation body;
A steel pipe sheet pile having a joint on the outer periphery, fitted to the outer periphery of the casing,
A steel pipe sheet pile press-in device comprising a steel pipe chuck device for chucking a lower portion of the steel pipe sheet pile and a press-fit device having a steel pipe press-in cylinder for press-fitting the steel pipe sheet pile.
請求項4において、
前記掘削体は、前記ケーシングの下部内周に設けた取付部に軸により回動自在に取付けると共に、前記ケーシングに設けた出入り用シリンダにより前記ケーシングの周縁内側下方から前記継ぎ手の下方まで進退させる構成とした鋼管矢板圧入装置。
In claim 4,
The excavation body is rotatably attached to an attachment portion provided on a lower inner periphery of the casing by a shaft, and is advanced and retracted from an inner periphery of the casing to a lower portion of the joint by an access cylinder provided in the casing. Steel pipe sheet pile press-fitting device.
請求項4または請求項5において、
前記回転駆動装置は、前記ケーシング内に挿入しうる外径で構成すると共に、前記チャック装置と一体状の構成とした鋼管矢板圧入装置。
In claim 4 or claim 5,
The rotary drive device is a steel pipe sheet pile press-fitting device that is configured with an outer diameter that can be inserted into the casing and that is integrated with the chuck device.
請求項4または請求項5において、
前記回転駆動装置は、前記ケーシングの上部に装着し、回転駆動装置の回転出力軸により前記ケーシングの上部内周にチャックしたチャック装置ごと前記ケーシングを駆動回転させる構成とした鋼管矢板圧入装置。
In claim 4 or claim 5,
A steel pipe sheet pile press-fitting device configured to drive and rotate the casing together with a chuck device attached to the upper portion of the casing and chucked on the inner periphery of the upper portion of the casing by a rotation output shaft of the rotation driving device.
請求項4または請求項5または請求項6または請求項7において、
前記出入り用シリンダおよび前記回転駆動装置は、前記掘削体を前記継ぎ手の下方部分でだけ放射方向に進退させて地盤を掘緩める構成とした鋼管矢板圧入装置。
In claim 4 or claim 5 or claim 6 or claim 7,
A steel pipe sheet pile press-fitting device in which the access cylinder and the rotary drive device are configured to move the excavation body forward and backward in the radial direction only at the lower portion of the joint to dig and loosen the ground.
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