JP2018159191A - Embedment method of tubular body - Google Patents

Embedment method of tubular body Download PDF

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JP2018159191A
JP2018159191A JP2017055681A JP2017055681A JP2018159191A JP 2018159191 A JP2018159191 A JP 2018159191A JP 2017055681 A JP2017055681 A JP 2017055681A JP 2017055681 A JP2017055681 A JP 2017055681A JP 2018159191 A JP2018159191 A JP 2018159191A
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tubular body
rotary press
frame
fitting device
base frame
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JP6694840B2 (en
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辰弥 駒澤
Tatsuya Komazawa
辰弥 駒澤
和男 駒澤
Kazuo Komazawa
和男 駒澤
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NIPPON BEESU KK
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Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently excavating and discharging sediment inside a tubular body by rotary press fitting into the ground.SOLUTION: In a method of excavating and discharging sediment inside a tubular body P such as a steel pipe pile and a casing by an excavator 30 while burying the tubular body in the ground with the tubular body P being rotated and pressed into the ground by a rotary press fitting device 10, the rotary press fitting device 10 comprises a polygonal base frame 11, and a lift frame 12 having a polygonal shape the same as that of the base frame 11 and provided with a chuck mechanism that ascends and descends relative to the base frame 11 and grips the tubular body P. A device is used in which insertion openings 14 and 15 for inserting the tubular body P in each of the frames 11 and 12 are biased toward one or two edge sides. As the excavator 30, a three-point type pile driver 30 having a ground auger 35 mounted on a leader 33 is used and the leader 33 is installed close to the edge of the rotary press fitting device 10.SELECTED DRAWING: Figure 4

Description

この発明は、管状体の埋設工法に関する。   The present invention relates to a method for embedding a tubular body.

鋼管杭やケーシングなどの管状体を地盤に埋設する工法として、回転圧入装置により管状体を地盤に回転圧入しながら、掘削装置により管状体内部の土砂を掘削排土する工法が知られている。   As a construction method for embedding a tubular body such as a steel pipe pile or casing in the ground, a construction method for excavating and discharging earth and sand inside the tubular body by a drilling device while the tubular body is rotationally pressed into the ground by a rotary press-fitting device is known.

このような工法に使用される回転圧入装置としては、例えば特許文献１に記載のようなものが知られている。この従来の回転圧入装置は、矩形のベースフレームと、このベースフレームと同形状の矩形をなす昇降フレームであって、ベースフレームに対して昇降するとともに管状体を把持するチャック機構が設けられた昇降フレームとを備えている。   As a rotary press-fitting device used in such a construction method, for example, the one described in Patent Document 1 is known. This conventional rotary press-fitting device includes a rectangular base frame and a lifting frame having the same shape as the base frame, and is provided with a chuck mechanism that lifts and lowers relative to the base frame and grips a tubular body. And a frame.

昇降フレーム及びベースフレームには管状体を挿入するための挿入開口が設けられ、管状体をチャック機構により把持した状態で管状体を回転させながら、昇降フレームを下降させて管状体を地盤に圧入するようになっている。   The elevating frame and the base frame are provided with insertion openings for inserting the tubular body. While the tubular body is rotated by the chuck mechanism, the elevating frame is lowered to press-fit the tubular body into the ground. It is like that.

また、管状体の圧入に伴って管状体内部の土砂が掘削・排土されるが、掘削機としては通常、クレーンの先端から吊り下げたハンマーグラブやバケットが使用されている（例えば特許文献２参照）。しかしながら、ハンマーグラブやバケットによる土砂の掘削・排土は効率が悪く、したがって管状体の埋設施工に時間を要しているのが現状である。   In addition, the sediment inside the tubular body is excavated and discharged with the press-fitting of the tubular body, and a hammer grab or bucket suspended from the tip of a crane is usually used as the excavator (for example, Patent Document 2). reference). However, the excavation and soil removal of earth and sand with hammer grabs and buckets is inefficient, and therefore it takes time to embed the tubular body.

特開２００２−７０００７号公報Japanese Patent Laid-Open No. 2002-70007 特開２００２−７０４６９号公報JP 2002-70469 A 特開２０１２−１６２９１２号公報JP 2012-162912 A 特開２００８−２０８６５５号公報JP 2008-208655 A

この発明は上記のような技術的背景に基づいてなされたものであって、次の目的を達成するものである。
この発明の目的は、管状体を地盤に回転圧入するにあたってその内部の土砂の掘削・排土を効率よく行うことができ、それによって管状体の埋設施工効率を向上させることができる工法を提供することにある。 The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is to provide a construction method capable of efficiently excavating and discharging earth and sand inside a tubular body by rotary press-fitting into the ground, thereby improving the efficiency of embedding the tubular body. There is.

掘削機としてリーダーにアースオーガーを搭載した三点式杭打ち機を使用すれば、土砂の掘削・排土効率を向上させることができる。しかしながら、回転圧入装置における管状体の挿入開口は、通常、その開口中心がベースフレーム及び昇降フレームの矩形中心と一致するように設けられ、また回転圧入のための各機器が挿入開口の周囲に対称となるように配置されている。   If a three-point pile driver with an earth auger installed in the leader is used as the excavator, the efficiency of excavating and discharging soil can be improved. However, the insertion opening of the tubular body in the rotary press-fitting device is usually provided so that the center of the opening coincides with the rectangular center of the base frame and the lifting frame, and each device for rotary press-fitting is symmetrical around the insertion opening. It is arranged to become.

このため、ベースフレーム及び昇降フレームの縁辺から挿入開口までの寸法距離が大きく、リーダーに搭載されたアースオーガーを管状体内部に挿入することが不可能であり、三点式杭打ち機は回転圧入装置と併用することはできない。   For this reason, the dimensional distance from the edge of the base frame and the lifting frame to the insertion opening is large, and it is impossible to insert the earth auger mounted on the leader into the tubular body, and the three-point pile driver is a rotary press-fitting device. Cannot be used together.

そこで、この発明の発明者は鋭意検討したところ、特許文献３あるいは特許文献４に記載の回転圧入装置に着目した。これら文献に記載の回転圧入装置は、管状体の埋設位置が施工現場に隣接した建物などによって仕切られたコーナー部でも圧入施工を可能としたもので、管状体の挿入開口はベースフレーム及び昇降フレームの１つの縁辺又は２つの縁辺寄りに偏って設けられている。そして、このような回転圧入装置を使用すれば、三点式杭打ち機を併用して、管状体内部の土砂を掘削・排土しながら管状体を地盤に圧入することができることを見出した。   Therefore, the inventors of the present invention diligently studied and paid attention to the rotary press-fitting device described in Patent Document 3 or Patent Document 4. The rotary press-fitting devices described in these documents are capable of press-fitting even in a corner portion where the embedded position of the tubular body is partitioned by a building or the like adjacent to the construction site. The insertion opening of the tubular body has a base frame and a lifting frame. It is biased toward one edge or two edges. And when such a rotary press-fitting apparatus was used, it discovered that a tubular body could be press-fitted into the ground, excavating and discharging soil inside the tubular body using a three-point pile driver.

この発明は上記のような知見に基づいてなされたもので、次のような手段を採用している。
すなわち、この発明は、回転圧入装置により鋼管杭やケーシングなどの管状体を地盤に回転圧入しながら、掘削装置により前記管状体内部の土砂を掘削排土して該管状体を地盤に埋設する工法であって、
前記回転圧入装置として、多角形のベースフレームと、該ベースフレームと同形状の多角形であって、該ベースフレームに対して昇降するとともに前記管状体を把持するチャック機構が設けられた昇降フレームとを備え、各フレームに前記管状体を挿入するための挿入開口が１つ又は２つの縁辺寄りに偏って設けられた装置を使用し、
前記掘削装置として、リーダーにアースオーガーが搭載された三点式杭打ち機を使用し、前記リーダーを前記回転圧入装置の前記縁辺に近接して設置することを特徴とする管状体の埋設工法にある。 The present invention has been made on the basis of the above knowledge, and employs the following means.
That is, the present invention relates to a method for excavating and discharging earth and sand inside the tubular body by a drilling device while embedding a tubular body such as a steel pipe pile or casing into the ground by a rotary press-fitting device and burying the tubular body in the ground. Because
As the rotary press-fitting device, a polygonal base frame, a polygonal frame having the same shape as the base frame, and a lifting frame provided with a chuck mechanism that moves up and down relative to the base frame and grips the tubular body; Using an apparatus in which insertion openings for inserting the tubular bodies are provided in each frame so as to be biased toward one or two edges,
As the excavating apparatus, a three-point pile driving machine having an earth auger mounted on a leader is used, and the leader is installed in the vicinity of the edge of the rotary press-fitting apparatus.

前記回転圧入装置としては、例えば、前記各フレームが矩形の一辺と二等辺三角形の底辺とを一致させてできる五角形のものであり、前記開口は前記二等辺三角形の等辺をなす２つの前記縁辺寄りに偏って設けられているものを使用することができる。   As the rotary press-fitting device, for example, each frame is a pentagon that is formed by matching one side of a rectangle with the base of an isosceles triangle, and the opening is close to the two edges forming the equilateral sides of the isosceles triangle. What is biased to can be used.

また、前記回転圧入装置としては、前記各フレームが矩形のものであり、前記開口は前記矩形の一辺をなす前記縁辺寄りに偏って設けられているものを使用することができる。   Further, as the rotary press-fitting device, it is possible to use a device in which each frame is rectangular and the opening is provided so as to be biased toward the edge forming one side of the rectangle.

管状体を地盤に回転圧入するにあたってその内部の土砂の掘削・排土を効率よく行うことができ、それによって管状体の埋設施工効率を向上させることができる。   When the tubular body is rotationally press-fitted into the ground, it is possible to efficiently excavate and remove the earth and sand inside the ground, thereby improving the efficiency of embedding the tubular body.

この発明工法に使用する回転圧入装置の一例を示す平面図である。It is a top view which shows an example of the rotary press-fit apparatus used for this invention construction method. 同回転圧入装置の正面図である。It is a front view of the rotary press-fitting device. この発明工法の実施形態を示す模式的な平面図である。It is a typical top view which shows embodiment of this invention construction method. 同実施形態を示す模式的な正面図である。It is a typical front view which shows the embodiment. 回転圧入装置の別の例を示す平面図である。It is a top view which shows another example of a rotary press-fit apparatus.

この発明の実施形態を図面を参照しながら以下に説明する。図１，図２は、この発明で使用する回転圧入装置の一例を示し、図１は平面図、図２は正面図である。この回転圧入装置については特許文献３に詳細に記載されているが、以下、概略構成を説明する。   Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an example of a rotary press-fitting device used in the present invention. FIG. 1 is a plan view and FIG. 2 is a front view. This rotary press-fitting device is described in detail in Patent Document 3, but the schematic configuration will be described below.

回転圧入装置１０は、ベースフレーム１１と、ベースフレーム１１の上に平行に配置された昇降フレーム１２とを備えている。昇降フレーム１２は昇降シリンダ１３を介してベースフレーム１１に連結され、ベースフレーム１１に対して昇降するようになっている   The rotary press-fitting device 10 includes a base frame 11 and a lifting frame 12 arranged in parallel on the base frame 11. The elevating frame 12 is connected to the base frame 11 via the elevating cylinder 13 so as to move up and down with respect to the base frame 11.

ベースフレーム１１及び昇降フレーム１２は、いずれも同形状同寸法のもので、具体的には矩形の一辺と直角二等辺三角形の底辺とを一致させてできる五角形を呈している。各フレーム１１，１２には鋼管杭やケーシングなどの管状体Ｐを挿入するための挿入開口１４，１５が設けられている。これらの挿入開口１４，１５は、直角二等辺三角形の等辺をなす２つの縁辺１２ａ，１２ｂ（図１に昇降フレーム１２の縁辺のみを示す）寄りに偏って形成され、挿入開口１４，１５の中心から縁辺１２ａ，１２ｂまでの距離寸法は等しく、またその寸法距離は小さく（例えば１０００ｍｍ程度）されている。   The base frame 11 and the elevating frame 12 have the same shape and the same size, and specifically have a pentagon shape formed by matching one side of a rectangle with the base of a right-angled isosceles triangle. Each frame 11, 12 is provided with insertion openings 14, 15 for inserting tubular bodies P such as steel pipe piles and casings. These insertion openings 14 and 15 are formed so as to be biased toward two edges 12a and 12b (only the edges of the lifting frame 12 are shown in FIG. 1) forming the equilateral sides of a right isosceles triangle, and the centers of the insertion openings 14 and 15 are formed. The distance dimension from the edge to the edges 12a and 12b is equal, and the distance is small (for example, about 1000 mm).

昇降フレーム１２の上方には管状体Ｐの挿入開口１６を有するチャックフレーム１７が設けられている。チャックフレーム１７は、その挿入開口１６を昇降フレーム１２及びベースフレーム１１の挿入開口１４，１５と合致させた状態で配置されている。チャックフレーム１７はチャックシリンダ１８を介して昇降フレーム１２に連結され、チャックフレーム１７は昇降フレーム１２に対して昇降するようになっている。   A chuck frame 17 having an insertion opening 16 for the tubular body P is provided above the elevating frame 12. The chuck frame 17 is disposed in a state where the insertion opening 16 is aligned with the insertion openings 14 and 15 of the elevating frame 12 and the base frame 11. The chuck frame 17 is connected to the lift frame 12 via a chuck cylinder 18, and the chuck frame 17 is lifted and lowered with respect to the lift frame 12.

チャックフレーム１７の下面にはチャック保持リング１９が回転可能に設けられ、チャック保持リング１９の下面には多数のくさび状のチャックシュー２０がリンクを介して設けられている。一方、昇降フレーム１２には管状体Ｐの挿入開口１５位置に内周がテーパ面となっている円筒体２１が回転可能に設けられている。チャックシリンダ１８が駆動することにより、チャックシュー２０が管状体Ｐと円筒体２１との間に入り込み、管状体Ｐが円筒体２１に固定されるようになっている。   A chuck holding ring 19 is rotatably provided on the lower surface of the chuck frame 17, and a number of wedge-shaped chuck shoes 20 are provided on the lower surface of the chuck holding ring 19 via links. On the other hand, the elevating frame 12 is rotatably provided with a cylindrical body 21 whose inner periphery is a tapered surface at the insertion opening 15 position of the tubular body P. By driving the chuck cylinder 18, the chuck shoe 20 enters between the tubular body P and the cylindrical body 21, and the tubular body P is fixed to the cylindrical body 21.

円筒体２１の外周に固定された大歯車２２には、アイドル歯車２３を介して駆動モータ２５の出力軸に設けられた駆動歯車２４が連結され、駆動モータ１５の駆動により円筒体２１が回転し、管状体Ｐに回転力が伝達されるようになっている。また、管状体Ｐの回転に伴って、昇降シリンダ１３の駆動により管状体Ｐに圧入力が伝達されるようになっている。図１，図２において符号２６が昇降ガイドポストを示している。   A driving gear 24 provided on an output shaft of a driving motor 25 is connected to a large gear 22 fixed to the outer periphery of the cylindrical body 21 via an idle gear 23, and the cylindrical body 21 is rotated by driving of the driving motor 15. The rotational force is transmitted to the tubular body P. Further, with the rotation of the tubular body P, the pressure input is transmitted to the tubular body P by driving the elevating cylinder 13. 1 and 2, reference numeral 26 indicates a lifting guide post.

図３，図４は上記回転圧入装置１０と三点式杭打ち機を併用した管状体Ｐの埋設施工状態を示す模式的な図であり、図３は平面図、図４は正面図である。三点式杭打ち機３０は、クローラ３１に旋回体３２が旋回可能に搭載され、旋回体３２の前端にはリーダー３３が設けられている。リーダー３３はその中間部と旋回体３２の後端との間に配置された２本のステー３４に起倒自在に支持されている。   3 and 4 are schematic views showing a state of burying construction of the tubular body P using the rotary press-fitting device 10 and a three-point pile driver, FIG. 3 is a plan view, and FIG. 4 is a front view. In the three-point pile driving machine 30, a turning body 32 is turnably mounted on a crawler 31, and a leader 33 is provided at the front end of the turning body 32. The leader 33 is supported by two stays 34 disposed between the intermediate portion thereof and the rear end of the revolving structure 32 so as to be freely tilted.

リーダー３３にはアースオーガー３５が搭載されている。アースオーガー３５は回転駆動装置３６とその出力軸３７に固定されるスクリュー３８とを備えている。回転駆動装置３６は、トップシーブ３９から垂下するワイヤーロープ４０に懸吊されるとともに、リーダー３３に設けられたガイドレール４１にスライド金具４２を介して上下方向に移動可能に支持されている。   An earth auger 35 is mounted on the leader 33. The earth auger 35 includes a rotation drive device 36 and a screw 38 fixed to the output shaft 37 thereof. The rotation drive device 36 is suspended from a wire rope 40 hanging from the top sheave 39 and supported by a guide rail 41 provided on the leader 33 so as to be movable in the vertical direction via a slide fitting 42.

回転駆動装置３６の下方にはシューター４３を有する排土装置４４が配置され、この排土装置４４はスライド金具４５を介してリーダー３３のガイドレール４１に支持されている。排土装置４４は管状体Ｐの頭部に着脱自在に固定され、上下にスクリュー３８が通過可能な開口が設けられている。   A soil removal device 44 having a shooter 43 is disposed below the rotation drive device 36, and this soil removal device 44 is supported by the guide rail 41 of the leader 33 via a slide fitting 45. The earth removing device 44 is detachably fixed to the head of the tubular body P, and is provided with an opening through which the screw 38 can pass vertically.

管状体Ｐの埋設施工に際しては、回転圧入装置１０の縁辺１２ａ，１２ｂの何れか一方にリーダー３３を近接させて三点式杭打ち機３０を設置する。スライド金具４２はアタッチメントを付加することによりリーダー３３と回転駆動装置３６との間の寸法距離を一定限度（１６００ｍｍ程度）まで延ばすことが可能である。これにより、スクリュー３８を回転圧入装置の挿入開口１４，１５，１６に挿入することが可能となる。すなわち、三点式杭打ち機３０のアースオーガー３５により管状体Ｐ内部の土砂を掘削・排土しながら、回転圧入装置１０により管状体Ｐを地盤に圧入することが可能となり、管状体Ｐの埋設施工を効率良く行うことができる。   When embedding the tubular body P, the three-point pile driving machine 30 is installed by bringing the leader 33 close to one of the edges 12a and 12b of the rotary press-fitting device 10. By attaching an attachment to the slide fitting 42, it is possible to extend the dimensional distance between the leader 33 and the rotary drive device 36 to a certain limit (about 1600 mm). Thereby, the screw 38 can be inserted into the insertion openings 14, 15, 16 of the rotary press-fitting device. That is, it becomes possible to press-fit the tubular body P into the ground by the rotary press-fitting device 10 while excavating and discharging the soil inside the tubular body P by the earth auger 35 of the three-point pile driving machine 30, and the tubular body P is buried. Can be performed efficiently.

回転圧入装置としては、図５に模式的な平面図で示すように、特許文献４記載のものも使用することができる。この回転圧入装置５０は、それぞれ矩形のベースフレーム（図示せず）及び昇降フレーム５１を備え、管状体の挿入開口５２がベースフレーム及び昇降フレーム５１の１つの縁辺５１ａ寄りに形成されている。図５において、符号５３はチャックフレーム、符号５４は駆動モータをそれぞれ示している。   As the rotary press-fitting device, the one described in Patent Document 4 can be used as shown in a schematic plan view in FIG. The rotary press-fitting device 50 includes a rectangular base frame (not shown) and an elevating frame 51, and an insertion opening 52 of a tubular body is formed near one edge 51 a of the base frame and the elevating frame 51. In FIG. 5, reference numeral 53 denotes a chuck frame, and reference numeral 54 denotes a drive motor.

この回転圧入装置５０も縁辺５１ａと挿入開口５２の中心との間の寸法距離が小さいので、三点式杭打ち機を併用して管状体を地盤に圧入することができる。   Since the rotary press-fitting device 50 also has a small dimensional distance between the edge 51a and the center of the insertion opening 52, the tubular body can be press-fitted into the ground using a three-point pile driver.

１０：回転圧入装置
１１：ベースフレーム
１２：昇降フレーム
１３：昇降シリンダ
１４，１５，１６：挿入開口
１７：チャックフレーム
１８：チャックシリンダ
２０：チャックシュー
２５：回転駆動装置
３０：三点式杭打ち機
３３：リーダー
３５：アースオーガー
３６：回転駆動装置
３８：スクリュー 10: Rotary press-fitting device 11: Base frame 12: Elevating frame 13: Elevating cylinder 14, 15, 16: Insertion opening 17: Chuck frame 18: Chuck cylinder 20: Chuck shoe 25: Rotation drive device 30: Three-point pile driver 33: Leader 35: Earth auger 36: Rotation drive device 38: Screw

Claims (3)

回転圧入装置により鋼管杭やケーシングなどの管状体を地盤に回転圧入しながら、掘削装置により前記管状体内部の土砂を掘削排土して該管状体を地盤に埋設する工法であって、
前記回転圧入装置として、多角形のベースフレームと、該ベースフレームと同形状の多角形であって、該ベースフレームに対して昇降するとともに前記管状体を把持するチャック機構が設けられた昇降フレームとを備え、各フレームに前記管状体を挿入するための挿入開口が１つ又は２つの縁辺寄りに偏って設けられた装置を使用し、
前記掘削装置として、リーダーにアースオーガーが搭載された三点式杭打ち機を使用し、前記リーダーを前記回転圧入装置の前記縁辺に近接して設置することを特徴とする管状体の埋設工法。 While rotating and press-fitting a tubular body such as a steel pipe pile or casing into the ground with a rotary press-fitting device, the excavating device excavates and discharges the sediment inside the tubular body, and embeds the tubular body in the ground,
As the rotary press-fitting device, a polygonal base frame, a polygonal frame having the same shape as the base frame, and a lifting frame provided with a chuck mechanism that moves up and down relative to the base frame and grips the tubular body; Using an apparatus in which insertion openings for inserting the tubular bodies are provided in each frame so as to be biased toward one or two edges,
A tubular body embedding method characterized in that a three-point pile driver with an earth auger mounted on a leader is used as the excavator, and the leader is installed close to the edge of the rotary press-fitting device. 前記回転圧入装置は、前記各フレームが矩形の一辺と二等辺三角形の底辺とを一致させてできる五角形のものであり、前記挿入開口は前記二等辺三角形の等辺をなす前記縁辺寄りに偏って設けられていることを特徴とする請求項１記載の管状体の埋設工法。   The rotary press-fitting device is a pentagonal shape in which each frame is formed by aligning one side of a rectangle with the base of an isosceles triangle, and the insertion opening is provided close to the edge forming the isosceles of the isosceles triangle. The tubular body embedding method according to claim 1, wherein the tubular body is embedded. 前記回転圧入装置は、前記各フレームが矩形のものであり、前記挿入開口は前記矩形の一辺をなす前記縁辺寄りに偏って設けられていることを特徴とする請求項１記載の管状体の埋設工法。   2. The tubular body embedding according to claim 1, wherein the rotary press-fitting device is configured such that each of the frames is rectangular, and the insertion opening is provided near the edge forming one side of the rectangle. Construction method.
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