JP6325823B2 - Steel pipe pile and method for press-fitting steel pipe pile - Google Patents

Steel pipe pile and method for press-fitting steel pipe pile Download PDF

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JP6325823B2
JP6325823B2 JP2014008630A JP2014008630A JP6325823B2 JP 6325823 B2 JP6325823 B2 JP 6325823B2 JP 2014008630 A JP2014008630 A JP 2014008630A JP 2014008630 A JP2014008630 A JP 2014008630A JP 6325823 B2 JP6325823 B2 JP 6325823B2
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steel pipe
pipe pile
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北村　精男
北村　　精男
厚 大平
厚 大平
伸彦 坊
伸彦 坊
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GIKEN LTD.
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Description

本発明は、鋼管杭及び鋼管杭の圧入方法に関する。   The present invention relates to a steel pipe pile and a method for press-fitting a steel pipe pile.

従来、鋼管杭を地盤に効率的に圧入する技術として、鋼管杭の内周面に沿ってパイプを配し、パイプの先端に設けられているノズルを鋼管杭の下端側に取り付けて、そのノズルから水等の流体物を吐出させながら鋼管杭を地盤に回転圧入施工する方法が知られている（例えば、特許文献１参照。）。
この方法では鋼管杭内の下端側に取り付けたノズルから水などの流体物を吐出させて、鋼管杭内に入り込む土砂と内周面との摩擦を低減したり、鋼管杭内に土砂が閉塞するのを防いだりすることで、鋼管杭を地盤に好適に圧入することを可能にしている。 Conventionally, as a technique for efficiently press-fitting a steel pipe pile into the ground, a pipe is arranged along the inner peripheral surface of the steel pipe pile, and a nozzle provided at the tip of the pipe is attached to the lower end side of the steel pipe pile. A method is known in which a steel pipe pile is rotationally press-fitted into the ground while fluids such as water are discharged from the ground (see, for example, Patent Document 1).
In this method, fluid such as water is discharged from a nozzle attached to the lower end of the steel pipe pile to reduce the friction between the sand and the inner peripheral surface entering the steel pipe pile, or the earth and sand is blocked in the steel pipe pile. By preventing this, the steel pipe pile can be suitably press-fitted into the ground.

特開２００５−１２７０９５号公報JP 2005-127095 A

しかしながら、上記特許文献１の場合、鋼管杭の外周面にフリクションカッターを固着してはいるが、その外周面に作用する摩擦対策としては十分なものではなかった。   However, in the case of the above-mentioned Patent Document 1, although a friction cutter is fixed to the outer peripheral surface of the steel pipe pile, it is not sufficient as a countermeasure against friction acting on the outer peripheral surface.

本発明の目的は、地盤に良好に圧入することができる鋼管杭及び鋼管杭の圧入方法を提供することである。   An object of the present invention is to provide a steel pipe pile that can be press-fitted well into the ground and a method for press-fitting a steel pipe pile.

以上の課題を解決するため、請求項１に記載の発明は、
地盤に圧入される鋼管杭であって、
当該鋼管杭の内周面に上端から下端に亘って流体供給用のパイプが取り付けられ、
前記パイプの先端に設けられたノズルから吐出される流体物の少なくとも一部が当該鋼管杭の内周面に沿って流れるように、前記ノズルが当該鋼管杭の下端側に取り付けられ、
圧入施工の過程で当該鋼管杭内に供給される流体物を内周面から外周面側に流出させる複数の貫通孔が、当該鋼管杭の長手方向に沿って形成されていることを特徴とする。 In order to solve the above problems, the invention described in claim 1
A steel pipe pile pressed into the ground,
A pipe for fluid supply is attached to the inner peripheral surface of the steel pipe pile from the upper end to the lower end,
The nozzle is attached to the lower end side of the steel pipe pile so that at least a part of the fluid discharged from the nozzle provided at the tip of the pipe flows along the inner peripheral surface of the steel pipe pile,
A plurality of through holes are formed along the longitudinal direction of the steel pipe pile to allow the fluid supplied to the steel pipe pile in the process of press-fitting to flow out from the inner peripheral surface to the outer peripheral surface side. .

請求項２に記載の発明は、請求項１に記載の鋼管杭において、
前記貫通孔と連通する小孔が形成された板状部材が前記外周面に設けられていることを特徴とする。 The invention according to claim 2 is the steel pipe pile according to claim 1 ,
A plate-like member having a small hole communicating with the through hole is provided on the outer peripheral surface.

請求項３に記載の発明は、
複数の貫通孔が長手方向に沿って形成されている鋼管杭を地盤に圧入する鋼管杭の圧入方法であって、
流体供給用のパイプの先端に設けられたノズルを、前記鋼管杭の下端側の内周面に取り付け、
前記鋼管杭を地盤に回転圧入する過程で、前記ノズルから吐出させた流体物の少なくとも一部を前記内周面に沿って流すとともに、前記貫通孔を通じて内周面側から外周面側へ流体物を流出させることを特徴とする。 The invention according to claim 3
A steel pipe pile press-in method for press-fitting a steel pipe pile in which a plurality of through holes are formed along the longitudinal direction into the ground,
A nozzle provided at the tip of a pipe for fluid supply is attached to the inner peripheral surface on the lower end side of the steel pipe pile,
In the process of rotationally press-fitting the steel pipe pile into the ground, at least part of the fluid discharged from the nozzle flows along the inner peripheral surface, and the fluid from the inner peripheral surface side to the outer peripheral surface side through the through hole. It is characterized by draining.

本発明によれば、鋼管杭を地盤に良好に圧入することができる。   According to the present invention, the steel pipe pile can be pressed into the ground satisfactorily.

本実施形態の鋼管杭を示す正面図（ａ）と、図１（ａ）のＢ−Ｂ線における断面図（ｂ）である。It is the front view (a) which shows the steel pipe pile of this embodiment, and sectional drawing (b) in the BB line of Fig.1 (a). 本実施形態の鋼管杭を示す側面図（ａ）と、図２（ａ）のＢ−Ｂ線における断面図（ｂ）である。It is the side view (a) which shows the steel pipe pile of this embodiment, and sectional drawing (b) in the BB line of Fig.2 (a). ノズルから吐出させた水の流れであって、鋼管杭の内周面に沿う水流に関する説明図である。It is the flow of the water discharged from the nozzle, Comprising: It is explanatory drawing regarding the water flow along the inner peripheral surface of a steel pipe pile. 本実施形態の鋼管杭を回転圧入する過程でノズルから吐出させた水の流れを断面視して示す説明図である。It is explanatory drawing which carries out the cross sectional view and shows the flow of the water discharged from the nozzle in the process in which the steel pipe pile of this embodiment is rotationally pressed. 従来の鋼管杭を回転圧入する過程でノズルから吐出させた水の流れを断面視して示す説明図である。It is explanatory drawing which shows the flow of the water discharged from the nozzle in the process of rotationally press-fitting the conventional steel pipe pile in a cross-sectional view.

以下、図面を参照して、本発明に係る鋼管杭及び鋼管杭の圧入方法の実施形態について詳細に説明する。   Hereinafter, embodiments of a steel pipe pile and a method for press-fitting a steel pipe pile according to the present invention will be described in detail with reference to the drawings.

本実施形態の鋼管杭１０は、図１（ａ）（ｂ）〜図２（ａ）（ｂ）に示すように、円筒状の鋼管杭１０の周面に複数の貫通孔１１が設けられたものである。
貫通孔１１は、鋼管杭１０を地盤に圧入施工する過程で、鋼管杭１０内に供給される水などの流体物を外周面側に流出させるために形成されている。 The steel pipe pile 10 of this embodiment is provided with a plurality of through holes 11 on the circumferential surface of the cylindrical steel pipe pile 10 as shown in FIGS. 1 (a) (b) to 2 (a) (b). Is.
The through-hole 11 is formed in order to flow a fluid such as water supplied into the steel pipe pile 10 to the outer peripheral surface side in the process of press-fitting the steel pipe pile 10 into the ground.

この鋼管杭１０の内周面には、先端にノズル１が設けられた水供給用のパイプ２が配設されている。このパイプ２の後端側はスイベルジョイントを介して送水ポンプ３に接続されている。なお、本実施の形態では流体物として水を使用しており、流体供給用として水供給用のパイプ２および送水ポンプ３を配設した。
ノズル１は鋼管杭１０の下端側に取り付けられており、ノズル１から吐出される水の少なくとも一部が鋼管杭１０の内周面に沿って流れる向きに配設されている。
例えば、ノズル１は、水の噴射口を鋼管杭１０の長手方向と直交する方向であって周面の接線方向に向けて取り付けられている。 On the inner peripheral surface of the steel pipe pile 10, a water supply pipe 2 having a nozzle 1 provided at the tip is disposed. The rear end side of the pipe 2 is connected to the water pump 3 via a swivel joint. In this embodiment, water is used as the fluid, and the water supply pipe 2 and the water pump 3 are provided for supplying the fluid.
The nozzle 1 is attached to the lower end side of the steel pipe pile 10, and at least a part of the water discharged from the nozzle 1 is arranged in a direction to flow along the inner peripheral surface of the steel pipe pile 10.
For example, the nozzle 1 is attached so that the water injection port is in a direction perpendicular to the longitudinal direction of the steel pipe pile 10 and in the tangential direction of the peripheral surface.

鋼管杭１０の外周面における貫通孔１１が形成されている箇所には、小孔５ａを有する板状部材５が設けられている。
板状部材５は、平板状の鋼板の略中央に小孔５が形成された部材であり、貫通孔１１と小孔５ａとが連通するように、鋼管杭１０の外周面に溶接によって固設されている。この板状部材５は、鋼管杭１０に形成された貫通孔１１部分を補強するために設けられている。なお、板状部材５のサイズや厚みは任意であり、鋼管杭１０の長さや厚さ、また貫通孔１１のサイズに応じて適宜調整したものを用いればよい。 A plate-like member 5 having a small hole 5 a is provided at a location where the through hole 11 is formed on the outer peripheral surface of the steel pipe pile 10.
The plate member 5 is a member in which a small hole 5 is formed at substantially the center of a flat steel plate, and is fixed to the outer peripheral surface of the steel pipe pile 10 by welding so that the through hole 11 and the small hole 5a communicate with each other. Has been. This plate-like member 5 is provided to reinforce the through-hole 11 portion formed in the steel pipe pile 10. In addition, the size and thickness of the plate-like member 5 are arbitrary, and what is appropriately adjusted according to the length and thickness of the steel pipe pile 10 and the size of the through hole 11 may be used.

また、鋼管杭１０の先端側には、鋼管杭１０の回転圧入を補助するために、複数の切削ビット４が取り付けられている。   A plurality of cutting bits 4 are attached to the distal end side of the steel pipe pile 10 in order to assist the rotary press-fitting of the steel pipe pile 10.

次に、上記した鋼管杭１０を地盤に圧入する方法について説明する。   Next, a method for press-fitting the steel pipe pile 10 described above into the ground will be described.

この鋼管杭１０を地盤に圧入するには、杭圧入機を用いる。
杭圧入機は、機械本体の下部に設けられ、既設の杭を掴むクランプ装置と、機械本体の前端部に設けられ、既設の杭に隣接した位置に圧入する杭を挟んで保持するチャック装置とを備えている。この杭圧入機は、クランプ装置で既設杭の上端側を掴み、その既設杭から反力を取った状態で、杭を把持するチャック装置を降下させるようにして、杭を地中に圧入するようになっている。なお、杭圧入機の構成や動作は従来公知のものと同様であるので、ここでは詳述しない。 In order to press-fit the steel pipe pile 10 into the ground, a pile press-in machine is used.
The pile press-in machine is provided at the lower part of the machine main body and clamps the existing pile, and the chuck device provided at the front end of the machine main body and holding the pile pressed into a position adjacent to the existing pile, It has. This pile press-fitting machine grabs the upper end of the existing pile with the clamp device, and with the reaction force taken from the existing pile, lowers the chuck device that holds the pile so that the pile is pressed into the ground. It has become. In addition, since the structure and operation | movement of a pile presser are the same as that of a conventionally well-known thing, it is not explained in full detail here.

鋼管杭１０の地盤への圧入施工は、回転圧入で行うことが好ましい。回転圧入であれば、鋼管杭１０の先端に切削ビット４を取り付けることで既設の構造物を打ち抜けるうえ、地盤が硬質であっても騒音・振動もほとんどなく圧入でき、既設構造物および周辺地盤への影響を抑えることができる。   It is preferable that the press-fitting construction of the steel pipe pile 10 to the ground is performed by rotary press-fitting. In the case of rotary press-fitting, the cutting bit 4 is attached to the tip of the steel pipe pile 10 to punch through the existing structure, and even if the ground is hard, it can be press-fitted with almost no noise and vibration, and the existing structure and the surrounding ground The influence on can be suppressed.

そして、鋼管杭１０を地盤に圧入施工する際に送水ポンプ３を作動させて、鋼管杭１０内に水を供給する。具体的には、鋼管杭１０を地盤に回転圧入する過程で、パイプ２を通じて送給された水をノズル１から噴射するように吐出させる。
このノズル１から吐出された水（ジェット水）は、図３に示すように、その少なくとも一部が鋼管杭１０の内周面に沿って流れる。また、ノズル１から吐出された水の一部は、鋼管杭１０の先端開口から外周面側へ流れる。
特に、鋼管杭１０の内周面に沿って流れる水の一部は、図４に示すように、貫通孔１１を通じて内周面側から外周面側へ流出する。 Then, when the steel pipe pile 10 is press-fitted into the ground, the water feed pump 3 is operated to supply water into the steel pipe pile 10. Specifically, in the process of rotationally press-fitting the steel pipe pile 10 into the ground, the water fed through the pipe 2 is discharged so as to be ejected from the nozzle 1.
As shown in FIG. 3, at least a part of the water (jet water) discharged from the nozzle 1 flows along the inner peripheral surface of the steel pipe pile 10. A part of the water discharged from the nozzle 1 flows from the tip opening of the steel pipe pile 10 to the outer peripheral surface side.
In particular, a part of the water flowing along the inner peripheral surface of the steel pipe pile 10 flows out from the inner peripheral surface side to the outer peripheral surface side through the through hole 11 as shown in FIG.

このように、鋼管杭１０の周面に複数の貫通孔１１を形成していることで、鋼管杭１０の内周面側に配設されているノズル１から吐出（噴射）された水が、貫通孔１１を通じて鋼管杭１０の外周面側へ流出するので、鋼管杭１０の内周面と外周面の両面にそれぞれ適量の水を流しながら、鋼管杭１０を地盤に回転圧入させることができる。
つまり、複数の貫通孔１１が形成されている鋼管杭１０であれば、その内周面と外周面にそれぞれ適量の水を流しながら、回転圧入施工を行うことができるので、その施工時に鋼管杭１０の内周面と外周面に作用する地盤や土砂との摩擦を水流によって低減することができる。
これに対し、図５に示す、従来の鋼管杭２０の場合、その周面に貫通孔１１が形成されていないため、鋼管杭２０の外周面には先端開口から流出した水しか流れないので、従来の鋼管杭２０を回転圧入する際、その外周面には地盤や土砂との摩擦が大きな負荷となって作用してしまう。
なお、鋼管杭１０に形成する貫通孔１１の数や位置は任意であり、鋼管杭１０の長さや厚さや径のサイズに応じて適宜調整し、鋼管杭１０の内周面と外周面の両面に水が適量流れるように設計すればよい。 Thus, the water discharged (injected) from the nozzle 1 arrange | positioned at the inner peripheral surface side of the steel pipe pile 10 by forming the several through-hole 11 in the peripheral surface of the steel pipe pile 10 is the following. Since it flows out to the outer peripheral surface side of the steel pipe pile 10 through the through-hole 11, the steel pipe pile 10 can be rotationally press-fitted into the ground while flowing an appropriate amount of water on both the inner peripheral surface and the outer peripheral surface of the steel pipe pile 10.
That is, if it is the steel pipe pile 10 in which the several through-hole 11 is formed, since a rotary press-in construction can be performed, flowing an appropriate amount of water to the inner peripheral surface and the outer peripheral surface, respectively, the steel pipe pile at the time of the construction The friction between the inner peripheral surface and the ground or earth and sand acting on the outer peripheral surface can be reduced by the water flow.
On the other hand, in the case of the conventional steel pipe pile 20 shown in FIG. 5, since the through-hole 11 is not formed in the peripheral surface, since only the water which flowed out from the front-end | tip opening flows into the outer peripheral surface of the steel pipe pile 20, When the conventional steel pipe pile 20 is rotationally press-fitted, friction with the ground or earth and sand acts on the outer peripheral surface as a large load.
In addition, the number and position of the through-holes 11 formed in the steel pipe pile 10 are arbitrary, and it adjusts suitably according to the length of the steel pipe pile 10, the thickness, or the size of a diameter, and both the inner peripheral surface of the steel pipe pile 10 and an outer peripheral surface It is necessary to design so that an appropriate amount of water can flow.

また、鋼管杭１０の貫通孔１１部分を補強するために設けた板状部材５はその厚み分、鋼管杭１０の外周面から突出しているので、鋼管杭１０を回転圧入する際、板状部材５はフリクションカットとしての効果を発揮することができる。
つまり、この鋼管杭１０は、その外周面に作用する摩擦を低減する水流に加え、その外周面にフリクションカットとして機能する板状部材５を備えているので、地盤に良好に圧入することができる。 Moreover, since the plate-shaped member 5 provided in order to reinforce the through-hole 11 part of the steel pipe pile 10 protrudes from the outer peripheral surface of the steel pipe pile 10 by the thickness, when rotatingly press-fitting the steel pipe pile 10, a plate-shaped member No. 5 can exhibit the effect as a friction cut.
That is, since this steel pipe pile 10 is provided with the plate-like member 5 functioning as a friction cut on the outer peripheral surface in addition to the water flow that reduces the friction acting on the outer peripheral surface, the steel pipe pile 10 can be pressed into the ground satisfactorily. .

以上のように、本実施形態の鋼管杭１０は、鋼管杭１０の内周面の下端側に配設したノズル１から水を吐出（噴射）させて、その内周面と外周面にそれぞれ適量の水を流すことができるので、その水流によって鋼管杭１０に作用する地盤や土砂との摩擦を低減して回転圧入施工を好適に行うことができる。
つまり、鋼管杭１０の内周面と外周面にそれぞれ適量の水を流し、その水流によって内周面と外周面に作用する摩擦の低減を図りつつ、鋼管杭１０を回転圧入することができるので、従来技術では施工が困難であった地盤に対しても良好に鋼管杭１０を圧入することが可能になる。
また、鋼管杭１０に作用する摩擦を低減して回転圧入施工を行うことができるため、従来よりもスムーズに鋼管杭１０を圧入することが可能になる。その結果、鋼管杭１０を地盤に圧入して埋設する施工期間を短縮することができ、工費の削減を図ることができる。 As described above, the steel pipe pile 10 of the present embodiment discharges (injects) water from the nozzle 1 disposed on the lower end side of the inner peripheral surface of the steel pipe pile 10, and appropriate amounts are applied to the inner peripheral surface and the outer peripheral surface, respectively. Therefore, it is possible to reduce the friction with the ground and the earth and sand that act on the steel pipe pile 10 by the water flow, and to perform the rotary press fitting work suitably.
That is, the steel pipe pile 10 can be rotationally press-fitted while flowing an appropriate amount of water on the inner peripheral surface and the outer peripheral surface of the steel pipe pile 10 and reducing the friction acting on the inner peripheral surface and the outer peripheral surface by the water flow. In addition, the steel pipe pile 10 can be press-fitted satisfactorily even to the ground that has been difficult to construct by the conventional technology.
Moreover, since the friction which acts on the steel pipe pile 10 can be reduced and the rotary press-in construction can be performed, the steel pipe pile 10 can be pressed in more smoothly than before. As a result, the construction period in which the steel pipe pile 10 is press-fitted into the ground and buried can be shortened, and the construction cost can be reduced.

なお、以上の実施の形態においては、鋼管杭１０の先端側に切削ビット４を設けたが、本発明はこれに限定されるものではなく、例えば、切削ビット４を設けない構成であってもよく、また、鋼管杭１０の先端側に螺旋状の掘削翼（スパイラル翼）を設けたものであってもよい。   In addition, in the above embodiment, although the cutting bit 4 was provided in the front end side of the steel pipe pile 10, this invention is not limited to this, For example, even if it is the structure which does not provide the cutting bit 4. Moreover, what provided the spiral excavation wing | blade (spiral wing | blade) in the front end side of the steel pipe pile 10 may be sufficient.

また、先端にノズル１が設けられた水供給用のパイプ２の数は限定されるものではなく、地盤条件に応じて適宜変更可能である。   Further, the number of water supply pipes 2 provided with the nozzle 1 at the tip is not limited and can be appropriately changed according to the ground conditions.

また、流体物は水であることに限らず、任意の液体や空気を使用してもよく、水（液体）と空気の混合体であってもよい。   The fluid is not limited to water, and any liquid or air may be used, or a mixture of water (liquid) and air may be used.

また、その他、具体的な細部構造等についても適宜に変更可能であることは勿論である。   In addition, it is needless to say that other specific detailed structures can be appropriately changed.

１ ノズル
２ パイプ
３ 送水ポンプ
４ 切削ビット
５ 板状部材
５ａ 小孔
１０ 鋼管杭
１１ 貫通孔 DESCRIPTION OF SYMBOLS 1 Nozzle 2 Pipe 3 Water pump 4 Cutting bit 5 Plate-shaped member 5a Small hole 10 Steel pipe pile 11 Through-hole

Claims (3)

地盤に圧入される鋼管杭であって、
当該鋼管杭の内周面に上端から下端に亘って流体供給用のパイプが取り付けられ、
前記パイプの先端に設けられたノズルから吐出される流体物の少なくとも一部が当該鋼管杭の内周面に沿って流れるように、前記ノズルが当該鋼管杭の下端側に取り付けられ、
圧入施工の過程で当該鋼管杭内に供給される流体物を内周面から外周面側に流出させる複数の貫通孔が、当該鋼管杭の長手方向に沿って形成されていることを特徴とする鋼管杭。 A steel pipe pile pressed into the ground,
A pipe for fluid supply is attached to the inner peripheral surface of the steel pipe pile from the upper end to the lower end,
The nozzle is attached to the lower end side of the steel pipe pile so that at least a part of the fluid discharged from the nozzle provided at the tip of the pipe flows along the inner peripheral surface of the steel pipe pile,
A plurality of through holes are formed along the longitudinal direction of the steel pipe pile to allow the fluid supplied to the steel pipe pile in the process of press-fitting to flow out from the inner peripheral surface to the outer peripheral surface side. Steel pipe pile. 前記貫通孔と連通する小孔が形成された板状部材が前記外周面に設けられていることを特徴とする請求項１に記載の鋼管杭。 The steel pipe pile according to claim 1 , wherein a plate-like member having a small hole communicating with the through hole is provided on the outer peripheral surface. 複数の貫通孔が長手方向に沿って形成されている鋼管杭を地盤に圧入する鋼管杭の圧入方法であって、
流体供給用のパイプの先端に設けられたノズルを、前記鋼管杭の下端側の内周面に取り付け、
前記鋼管杭を地盤に回転圧入する過程で、前記ノズルから吐出させた流体物の少なくとも一部を前記内周面に沿って流すとともに、前記貫通孔を通じて内周面側から外周面側へ流体物を流出させることを特徴とする鋼管杭の圧入方法。 A steel pipe pile press-in method for press-fitting a steel pipe pile in which a plurality of through holes are formed along the longitudinal direction into the ground,
A nozzle provided at the tip of a pipe for fluid supply is attached to the inner peripheral surface on the lower end side of the steel pipe pile,
In the process of rotationally press-fitting the steel pipe pile into the ground, at least part of the fluid discharged from the nozzle flows along the inner peripheral surface, and the fluid from the inner peripheral surface side to the outer peripheral surface side through the through hole. A method for press-fitting steel pipe piles, characterized by causing the steel to flow out.
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