JP2004076533A

JP2004076533A - Pile connecting structure

Info

Publication number: JP2004076533A
Application number: JP2002242189A
Authority: JP
Inventors: Sadao Yabuuchi; 藪内　貞男
Original assignee: Geotop Corp
Current assignee: Geotop Corp
Priority date: 2002-08-22
Filing date: 2002-08-22
Publication date: 2004-03-11
Anticipated expiration: 2022-08-22
Also published as: JP3965572B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile connecting structure which facilitates and ensures connection of an upper pile and a lower pile, prevents the diameter thereof from enlarging even at a joint portion, and is constructed with high workability. <P>SOLUTION: The upper pile 1 and the lower pile 2 are connected together via respective edge plates 3. The edge plate of each of the upper and lower piles 1, 2 has tensioning tap holes 4 available at the time of producing the pile, and bolts 5 are screwed into the tap holes 4, respectively. Then the other edge plate 3 has insertion portions at locations opposed to the bolts 5. Each insertion portion consists of a large-diameter portion 31 into which a head 51 of the bolt 5 is inserted, a large-diameter slot 32 which communicates with the large-diameter portion 31, and allows the bolt head 51 to circumferentially shift, and a collar 33 which protrudes from the large-diameter slot 32 in a manner pinching a shaft 52 of the bolt 5 and engages with the head 51 of the shifted bolt 5. Then the bolt 5 is inserted into the large-diameter portion 31 formed in the edge plate 3 for the other pile, and by rotating the upper pile 1 with the bolt maintaining the inserted state, the bolt head 51 is shifted to the large-diameter slot 32, to thereby fix both the edge plates 3 to each other. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、コンクリート杭や鋼管杭の接続構造に関し、特に、上杭と下杭を簡単かつ確実に接続することができる作業性の高い杭の接続構造に関するものである。
【０００２】
【従来の技術】
従来、上杭と下杭を接続する杭の接続構造としては、上杭と下杭の端板同士を溶接により接続したり、端板の外周部にフランジ継手を突設し、この対設するフランジ継手間をボルト、ナットにて締結する方法が汎用されている。
また、上杭の端部と下杭の端部に、一対の内嵌部と外嵌部を振り分けて設けるとともに、これら内嵌部と外嵌部にそれぞれねじを形成し、内嵌部と外嵌部を螺合接続する方法もある。
【０００３】
【発明が解決しようとする課題】
ところで、上記従来の上杭と下杭を接続する接続構造は、それぞれ次のような問題点を有している。
▲１▼溶接による杭の接続構造においては、溶接に時間を要したり、天候によっては施工現場において溶接作業を行うことができなかったり、さらに、溶接の欠陥や溶接部の脆化を防止するためには、所要の設備と熟練した技術者を必要とし、コストがかかったり、技術者が不足がちになる。
▲２▼フランジ継手による接続方法では、継手部分の外径が鋼管杭の外径よりも大きく、鋼管杭の外周面から大きく突出することから、杭を地盤中に埋設する際に大きな貫入抵抗となり、また継手部分に曲げモーメントが作用し、さらに継手部分間には杭の外周に空間が生じてしまい、水平支持力が確保できなくなるおそれがある。
▲３▼上杭の端部と下杭の端部に設けた内嵌部と外嵌部を螺合接続する杭の接続構造は、大径となる内嵌部と外嵌部にねじを形成するための機械加工がコスト高を招き、また、重量物である杭の螺合接続作業は作業性が悪く、多大な手間を要し、さらに、内嵌部と外嵌部に形成したねじが損傷を受けやすく、この場合には、螺合接続作業が困難になる。
【０００４】
本発明は、上記従来の杭の接続構造が有する問題点に鑑み、上杭と下杭を簡単かつ確実に接続し、かつ杭径をこの接続部においても大径とならないようにすることができる作業性の高い杭の接続構造を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の杭の接続構造は、上杭と下杭とを各々の端板を介して接続する杭の接続構造において、端板に形成されたボルト穴にボルトを螺合するとともに、相手側の端板のボルトの対向位置に、ボルトの頭部が挿入される大径部と、該大径部と連通しボルト頭部の周方向の移行を許容する大径溝部と、該大径溝部からボルトの軸部を挟むように突設され、移行したボルトの頭部を掛止する鍔部とを形成し、ボルトを相手側端板の大径部に挿入して杭を回転させることにより、ボルト頭部を大径溝部に移行させて端板同士を固定するようにしたことを特徴とする。
【０００６】
この杭の接続構造は、端板に形成されたボルト穴にボルトを螺合するとともに、相手側の端板のボルトの対向位置に、ボルトの頭部が挿入される大径部と、該大径部と連通しボルト頭部の周方向の移行を許容する大径溝部と、該大径溝部からボルトの軸部を挟むように突設され、移行したボルトの頭部を掛止する鍔部とを形成し、ボルトを相手側端板の大径部に挿入して杭を回転させることにより、ボルト頭部を大径溝部に移行させて端板同士を固定することから、上杭及び下杭の各端板同士をボルトを介して簡単に固定することができ、これにより、上杭と下杭の接続を迅速かつ安価に行うことができるとともに、杭の外周部に突起物がないことから、杭径を一定として貫入作業に支障なく杭を地盤中に埋設することができる。
また、本発明の杭の接続構造は、鋼管杭とプレストレスコンクリート杭との接続も強固に行うことができ、さらに、杭の接続が簡易かつ短時間に行えることから、杭の施工効率を大幅に向上させることができる。
【０００７】
この場合において、前記ボルト穴として緊張用タップ穴を使用することができる。
【０００８】
これにより、予めプレストレスコンクリート杭の端板に形成される緊張用タップ穴を利用して加工工程の手数を減じることができる。
【０００９】
また、上杭及び下杭の各端板のボルト穴にボルトを螺合するとともに、各端板のボルトの対向位置に大径部と大径溝部と鍔部とを形成し、ボルトを相手側端板の大径部に相互に挿入して杭を回転させることができる。
【００１０】
これにより、上杭と下杭の端板を相互にボルトで固定することができ、杭の接続をより強固に行うことができる。
【００１１】
また、上杭又は下杭の一方の端板のボルト穴にボルトを螺合するとともに、他方の端板のボルトの対向位置に大径部と大径溝部と鍔部とを形成し、ボルトを相手側端板の大径部に相互に挿入して杭を回転させるようにすることができる。
【００１２】
これにより、上杭と下杭の端板同士をボルトを介して簡易に固定することができる。
【００１３】
また、ボルト頭部の下面と対向する鍔部の位置の片側に、塑性変形層を形成することができる。
【００１４】
これにより、ボルト（ボルト頭部）が、相手側端板の大径部から大径溝部に移行するときに、ボルト頭部の下面が、塑性変形層と接触し、その摩擦抵抗により特定の一方向（ボルトを締め付ける方向）に回転して、ボルトによる締付力を出現させることができる。
【００１５】
また、上杭と下杭の各端板に、回転させた位置で一致するキー溝を形成し、該キー溝に回り止めのキー部材を固設することができる。
【００１６】
これにより、回転後の位置で上下の杭を固定して杭の逆回転を防止し、大径部からボルトが抜けることを防止することができる。
【００１７】
【発明の実施の形態】
以下、本発明の杭の接続構造の実施の形態を図面に基づいて説明する。
【００１８】
図１〜図３に、本発明の杭の接続構造の一実施例を示す。
この杭の接続構造は、上杭１と下杭２とを各々の端板３を介して接続するもので、上杭１と下杭２の各端板３に形成された杭を製造する際に使用される緊張用タップ穴４に、例えば、高力ボルト等のボルト５を螺合するとともに、相手側の端板３のボルト５の対向位置に、ボルト５の頭部５１が挿入される大径部３１と、該大径部３１と連通しボルト頭部５１の周方向の移行を許容する大径溝部３２と、該大径溝部３２からボルト５の軸部５２を挟むように突設され、移行したボルト５の頭部５１を掛止する鍔部３３とを形成している。
そして、ボルト５を相手側端板３の大径部３１に挿入し、その状態で、例えば上杭１を回転させることにより、ボルト頭部５１を大径溝部３２に移行させて端板３同士を固定するようにしている。
この場合、ボルト５は、ボルト５を相手側端板３の大径部３１に挿入し、そのボルト頭部５１を大径溝部３２に移行させることができるように、所定長突出した状態に螺合しておくようにする。
【００１９】
さらに、ボルト５（ボルト頭部５１）が、相手側端板３の大径部３１から大径溝部３２に移行するときに、ボルト５が締まる方向に自然に回転するように、図１（ｂ’）に示すように、ボルト頭部５１の下面と対向する鍔部３３の位置の片側に、ポリエチレン樹脂等の合成樹脂やアルミニウム等の金属からなる塑性変形層３３ａを、塑性変形層３３ａにボルト頭部５１の下面が接触する程度の厚さに形成するようにする。これにより、ボルト５（ボルト頭部５１）が、相手側端板３の大径部３１から大径溝部３２に移行するときに、ボルト頭部５１の下面が、塑性変形層３３ａと接触し、その摩擦抵抗により特定の一方向（ボルト５を締め付ける方向）に回転して、ボルト５による締付力を出現させることができる。
【００２０】
また、上杭１と下杭２の各端板３には、回転させた位置で一致するキー溝６が数カ所形成されている。このキー溝６には、回り止めのためのくさび状のキー部材７が打ち込みにより固設されている。
このように、杭１、２の回転後の位置で、上杭端板３のキー溝６と下杭端板３のキー溝６とをキー部材７で結合することにより、杭１、２の逆回転を防止し、大径部３１からボルト５が抜けることを防止している。
なお、杭に曲げ力が加わると、キー部材７が抜けることも考えられるため、キー部材７を、図２（ｃ）に示すように、縦型Ｈ型のように形成するとともに、キー溝６を同じ形状に形成することもできる。
【００２１】
上杭１や下杭２は、プレストレストコンクリート杭等のコンクリート杭からなり、その端部には端板３が配設されている。
端板３には、ＰＣ鋼棒８に隣接するように、コンクリート杭にプレストレスをかける際に使用された複数の緊張用タップ穴４が等間隔で形成されており、これらの緊張用タップ穴４には、軸部５２が少し出る状態で複数のボルト５が締着されている。
なお、突出する軸部５２の長さは、後述する大径溝部３２の鍔部３３の厚みよりもやや長くなるようにする。
【００２２】
これに対し、相手側の端板３のボルト５と対向する位置には、前記した大径部３１と大径溝部３２、そして、大径溝部３２の表側の縁部から突設された鍔部３３が形成されている。
大径部３１は端板３を貫通するように形成され、また、大径溝部３２は、鍔部３３を残して大径部３１を端板３の周方向に延長するように形成されている。この場合、複数の大径部３１において、大径溝部３２は同じ方向に延設されている。
なお、本実施例の場合（後述の図４に示す実施例も同様）、平面視して、下杭２に対して上杭１を左回転することにより、上杭１と下杭２を接続することができるが、このほか、後述の図５に示す実施例のように、平面視して、下杭２に対して上杭１を右回転することにより、上杭１と下杭２を接続するようにすることもできる。
上杭１と下杭２を接続するときには、図２〜図３に示すように、複数のボルト５をそれぞれ相手側端板３の大径部３１に挿入し、その状態で上杭１を回転させることによって、ボルト頭部５１を大径溝部３２に移行させ、上杭１と下杭２の端板３同士を固定する。
そして、杭の回転後の位置で、上下の端板３のキー溝６にキー部材７を打ち込むことにより、杭の逆回転を防止し、大径部３１からのボルト５の抜けを防止する。
【００２３】
一方、図４に示すように、大径部３１、大径溝部３２及び鍔部３３、又はボルト５は、上杭１や下杭２のいずれか一方の端板３にのみ形成することもできる。
すなわち、上杭１又は下杭２の一方の端板３の緊張用タップ穴４にボルト５を螺合するとともに、他方の端板３のボルト５の対向位置に大径部３１と大径溝部３２と鍔部３３とを形成し、ボルト５を相手側端板３の大径部３１に挿入して上杭１を回転させるようにする。
なお、大径部３１、大径溝部３２及び鍔部３３を形成する端板３は、作用する曲げや引張力を考慮して、ボルト５側の端板３よりやや厚みを大きくすることが望ましい。
このように、大径部３１、大径溝部３２及び鍔部３３を一方の端板３に、また、ボルト５を他方の端板３に形成することにより、上杭１と下杭２の端板３同士をボルト５を介して簡易に固定することができる。
【００２４】
また、本発明の杭の接続構造は、鋼管杭同士、鋼管杭とコンクリート杭の組み合わせにも適用することができる。
すなわち、図５に示すように、筒状に形成された鋼管杭の端部に円環状の端板３を溶接等により固定し、例えば、上杭１の端板３に前記した大径部３１、大径溝部３２及び鍔部３３を形成するとともに、下杭２の円環状の端板３にボルト穴を形成してボルト５を螺合する。
そして、上杭１と下杭２を接続するときには、複数のボルト５を相手側端板３の大径部３１に挿入し、その状態で上杭１を回転させることによって、ボルト頭部５１を大径溝部３２に移行させ、上杭１と下杭２の端板３同士を固定する。
また、杭の回転後の位置で、上下の端板３のキー溝６にキー部材７を打ち込むことにより、杭の逆回転を防止し、大径部３１からのボルト５の抜けを防止する。
【００２５】
かくして、本実施例の杭の接続構造は、端板３に形成された緊張用タップ穴４にボルト５を螺合するとともに、相手側の端板３のボルト５の対向位置に、ボルト５の頭部５１が挿入される大径部３１と、該大径部３１と連通しボルト頭部５１の周方向の移行を許容する大径溝部３２と、該大径溝部３２からボルト５の軸部５２を挟むように突設され、移行したボルト５の頭部５１を掛止する鍔部３３とを形成し、ボルト５を相手側端板３の大径部３１に挿入して杭を回転させることにより、ボルト頭部５１を大径溝部３２に移行させて端板３同士を固定することから、上杭１及び下杭２の各端板３同士をボルト５を介して簡単に固定することができ、これにより、上杭１と下杭２の接続を迅速かつ安価に行うことができるとともに、杭の外周部に突起物がないことから、杭径を一定として貫入作業に支障なく杭を地盤中に埋設することができる。
そして、上杭１及び下杭２の各端板３の緊張用タップ穴４にボルト５を螺合するとともに、各端板３のボルト５の対向位置に大径部３１と大径溝部３２と鍔部３３とを形成し、ボルト５を相手側端板３の大径部３１に相互に挿入して杭を回転させることにより、上杭１と下杭２の端板３を相互にボルト５で固定することができ、杭の接続をより強固に行うことができる。
この場合、ボルト穴として緊張用タップ穴４を使用することにより、予めプレストレスコンクリート杭の端板３に形成される緊張用タップ穴４を利用して加工工程の手数を減じることができる。
また、本発明の杭の接続構造は、鋼管杭とプレストレスコンクリート杭との接続も強固に行うことができ、さらに、杭の接続が簡易かつ短時間に行えることから、杭の施工効率を大幅に向上させることができる。
【００２６】
以上、本発明の実施例を説明したが、本発明の杭の接続構造はこの実施例に記載した構成に限定されるものではなく、各実施例に記載した構成を適宜組み合わせたり、端板に鋼材や鋳鉄を適宜使用する等、その趣旨を逸脱しない範囲において適宜その構成を変更することができる。
【００２７】
【発明の効果】
本発明の杭の接続構造によれば、端板に形成されたボルト穴にボルトを螺合するとともに、相手側の端板のボルトの対向位置に、ボルトの頭部が挿入される大径部と、該大径部と連通しボルト頭部の周方向の移行を許容する大径溝部と、該大径溝部からボルトの軸部を挟むように突設され、移行したボルトの頭部を掛止する鍔部とを形成し、ボルトを相手側端板の大径部に挿入して杭を回転させることにより、ボルト頭部を大径溝部に移行させて端板同士を固定することから、上杭及び下杭の各端板同士をボルトを介して簡単に固定することができ、これにより、上杭と下杭の接続を迅速かつ安価に行うことができるとともに、杭の外周部に突起物がないことから、杭径を一定として貫入作業に支障なく杭を地盤中に埋設することができる。
また、本発明の杭の接続構造は、鋼管杭とプレストレスコンクリート杭との接続も強固に行うことができ、さらに、杭の接続が簡易かつ短時間に行えることから、杭の施工効率を大幅に向上させることができる。
【００２８】
この場合、前記ボルト穴として緊張用タップ穴を使用することにより、予めプレストレスコンクリート杭の端板に形成される緊張用タップ穴を利用して施工の工数を減じることができる。
【００２９】
また、上杭及び下杭の各端板のボルト穴にボルトを螺合するとともに、各端板のボルトの対向位置に大径部と大径溝部と鍔部とを形成し、ボルトを相手側端板の大径部に相互に挿入して杭を回転させることにより、上杭と下杭の端板を相互にボルトで固定することができ、杭の接続をより強固に行うことができる。
【００３０】
また、上杭又は下杭の一方の端板のボルト穴にボルトを螺合するとともに、他方の端板のボルトの対向位置に大径部と大径溝部と鍔部とを形成し、ボルトを相手側端板の大径部に相互に挿入して杭を回転させるようにすることにより、上杭と下杭の端板同士をボルトを介して簡易に固定することができる。
【００３１】
また、ボルト頭部の下面と対向する鍔部の位置の片側に、塑性変形層を形成することにより、ボルト（ボルト頭部）が、相手側端板の大径部から大径溝部に移行するときに、ボルト頭部の下面が、塑性変形層と接触し、その摩擦抵抗により特定の一方向（ボルトを締め付ける方向）に回転して、ボルトによる締付力を出現させることができる。
【００３２】
また、上杭と下杭の各端板に、回転させた位置で一致するキー溝を形成し、該キー溝に回り止めのキー部材を固設することにより、回転後の位置で上下の杭を固定して杭の逆回転を防止し、大径部からボルトが抜けることを防止することができる。
【図面の簡単な説明】
【図１】本発明の杭の接続構造の一実施例を示し、（ａ）は杭の端板の要部拡大平面図、（ｂ）は端板の裏側から見た大径部と大径溝部の正面図、（ｂ’）は塑性変形層を形成した状態を示す端板の裏側から見た大径部と大径溝部の正面図、（ｃ）は杭の要部拡大断面図である。
【図２】同実施例の杭の接続構造の接続工程を示す要部拡大断面図である。
【図３】上杭の端板と下杭の端板をそれぞれ表側から見た正面図である。
【図４】他の実施例の上杭の端板と下杭の端板をそれぞれ表側から見た正面図である。
【図５】鋼管杭の接続構造を示し、（ａ）は上杭の端板の底面図、（ｂ）は上杭と下杭の接続を示す断面図である。
【符号の説明】
１　　上杭
２　　下杭
３　　端板
３１　大径部
３２　大径溝部
３３　鍔部
３３ａ　塑性変形層
４　　緊張用タップ穴
５　　ボルト
５１　頭部
５２　軸部
６　　キー溝
７　　キー部材
８　　ＰＣ鋼棒[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connection structure for a concrete pile or a steel pipe pile, and more particularly to a connection structure for a pile with high workability that can easily and reliably connect an upper pile and a lower pile.
[0002]
[Prior art]
Conventionally, as a connection structure of a pile that connects an upper pile and a lower pile, end plates of the upper pile and the lower pile are connected by welding, or a flange joint is protrudingly provided on an outer peripheral portion of the end plate, and this is installed oppositely. A method of fastening between flange joints with bolts and nuts is widely used.
In addition, a pair of inner fitting portions and outer fitting portions are separately provided at an end of the upper pile and an end portion of the lower pile, and screws are formed in the inner fitting portions and the outer fitting portions, respectively. There is also a method of screwing and connecting the fitting portions.
[0003]
[Problems to be solved by the invention]
By the way, the conventional connection structure for connecting the upper pile and the lower pile has the following problems, respectively.
(1) In the connection structure of piles by welding, welding takes time, welding work cannot be performed at the construction site depending on the weather, and welding defects and weld brittleness are prevented. In order to do so, required equipment and skilled technicians are required, which is costly and tends to be short of technicians.
(2) In the connection method using a flange joint, since the outer diameter of the joint is larger than the outer diameter of the steel pipe pile and protrudes greatly from the outer peripheral surface of the steel pipe pile, a large penetration resistance occurs when the pile is buried in the ground. In addition, a bending moment acts on the joints, and a space is formed between the joints on the outer periphery of the pile, and there is a possibility that the horizontal support force cannot be secured.
(3) The connection structure of the pile, which screw-connects the inner fitting part and the outer fitting part provided at the end of the upper pile and the end of the lower pile, forms a screw at the inner fitting part and the outer fitting part which have a large diameter. In addition, the threading connection of heavy piles is inferior in workability and requires a great deal of labor, and the screws formed in the inner and outer fitting parts are expensive. It is easily damaged, and in this case, the screw connection work becomes difficult.
[0004]
The present invention, in view of the above-mentioned problems of the conventional pile connection structure, can easily and surely connect the upper pile and the lower pile, and can prevent the pile diameter from becoming large even at this connection portion. An object of the present invention is to provide a connection structure for piles with high workability.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a connection structure for piles according to the present invention is a connection structure for piles in which an upper pile and a lower pile are connected via respective end plates, wherein bolts are screwed into bolt holes formed in the end plates. A large-diameter portion into which the head of the bolt is inserted, and a large-diameter groove communicating with the large-diameter portion and allowing a circumferential transition of the bolt head at the position facing the bolt on the mating end plate. And a flange portion protruding from the large-diameter groove portion so as to sandwich the shaft portion of the bolt, and forming a flange portion for hooking the head of the transferred bolt, and inserting the bolt into the large-diameter portion of the mating end plate. By rotating the pile, the bolt head is shifted to the large-diameter groove to fix the end plates to each other.
[0006]
In this connection structure for a pile, a bolt is screwed into a bolt hole formed in an end plate, and a large-diameter portion into which the head of the bolt is inserted at a position facing the bolt on the mating end plate; A large-diameter groove portion communicating with the diameter portion and allowing the circumferential movement of the bolt head, and a flange portion projecting from the large-diameter groove portion so as to sandwich the bolt shaft portion, and hooking the transferred bolt head portion The bolts are inserted into the large-diameter portion of the mating end plate and the pile is rotated to shift the bolt head to the large-diameter groove and fix the end plates together. Each end plate of the pile can be easily fixed to each other via bolts, so that the connection between the upper pile and the lower pile can be performed quickly and inexpensively, and there is no protrusion on the outer periphery of the pile. Therefore, the pile can be buried in the ground without hindering the penetration work with a constant pile diameter.
Further, the connection structure of the pile according to the present invention can strongly connect the steel pipe pile and the prestressed concrete pile, and furthermore, since the connection of the pile can be performed easily and in a short time, the construction efficiency of the pile is greatly improved. Can be improved.
[0007]
In this case, a tension tap hole can be used as the bolt hole.
[0008]
Thus, the number of working steps can be reduced by using the tension tap holes formed in the end plate of the prestressed concrete pile in advance.
[0009]
In addition, a bolt is screwed into a bolt hole of each end plate of the upper pile and the lower pile, and a large-diameter portion, a large-diameter groove portion, and a flange portion are formed at positions facing the bolts of each end plate. The pile can be rotated by inserting it into the large diameter part of the end plate.
[0010]
Thus, the end plates of the upper pile and the lower pile can be fixed to each other with bolts, and the piles can be connected more firmly.
[0011]
In addition, a bolt is screwed into a bolt hole of one end plate of the upper pile or the lower pile, and a large-diameter portion, a large-diameter groove portion, and a flange portion are formed at positions facing the bolts of the other end plate. The pile can be rotated by inserting it into the large diameter portion of the mating end plate.
[0012]
Thereby, the end plates of the upper pile and the lower pile can be easily fixed via the bolts.
[0013]
Further, a plastically deformable layer can be formed on one side of the position of the flange portion facing the lower surface of the bolt head.
[0014]
As a result, when the bolt (bolt head) moves from the large-diameter portion of the mating end plate to the large-diameter groove, the lower surface of the bolt head comes into contact with the plastically deformable layer, and the specific resistance is determined by the frictional resistance. By rotating in the direction (the direction in which the bolt is tightened), the tightening force of the bolt can be developed.
[0015]
In addition, a key groove corresponding to the rotated position is formed in each end plate of the upper pile and the lower pile, and a key member for preventing rotation is fixed to the key groove.
[0016]
Thereby, the upper and lower piles are fixed at the position after the rotation, thereby preventing the piles from rotating in the reverse direction and preventing the bolts from coming off from the large diameter portion.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a pile connection structure of the present invention will be described with reference to the drawings.
[0018]
1 to 3 show one embodiment of the pile connection structure of the present invention.
This pile connection structure connects the upper pile 1 and the lower pile 2 via the respective end plates 3, and is used when manufacturing the piles formed on the respective end plates 3 of the upper pile 1 and the lower pile 2. For example, a bolt 5 such as a high-strength bolt is screwed into the tension tap hole 4 used in the step (a), and the head 51 of the bolt 5 is inserted into the opposite end plate 3 at a position facing the bolt 5. A large-diameter portion 31, a large-diameter groove portion 32 communicating with the large-diameter portion 31 and allowing the circumferential movement of the bolt head 51, and projecting from the large-diameter groove portion 32 so as to sandwich a shaft portion 52 of the bolt 5. Thus, a flange portion 33 for hanging the head portion 51 of the transferred bolt 5 is formed.
Then, the bolt 5 is inserted into the large-diameter portion 31 of the mating end plate 3, and in this state, for example, by rotating the upper pile 1, the bolt head 51 is moved to the large-diameter groove portion 32, and the end plates 3 are joined together. Is fixed.
In this case, the bolt 5 is inserted into the large-diameter portion 31 of the mating end plate 3, and the bolt head 51 is screwed into a state of projecting a predetermined length so that the bolt head 51 can be shifted to the large-diameter groove 32. To keep them together.
[0019]
Further, when the bolt 5 (bolt head 51) moves from the large-diameter portion 31 of the mating end plate 3 to the large-diameter groove portion 32, the bolt 5 naturally rotates in a tightening direction as shown in FIG. As shown in ()), a plastic deformation layer 33a made of a synthetic resin such as polyethylene resin or a metal such as aluminum is provided on one side of the position of the flange portion 33 facing the lower surface of the bolt head 51, and the plastic deformation layer 33a is bolted to the plastic deformation layer 33a. The head 51 is formed to have such a thickness as to contact the lower surface thereof. Thereby, when the bolt 5 (bolt head 51) moves from the large diameter portion 31 of the mating end plate 3 to the large diameter groove portion 32, the lower surface of the bolt head 51 comes into contact with the plastic deformation layer 33a, Due to the frictional resistance, the bolt 5 can be rotated in one specific direction (the direction in which the bolt 5 is tightened), and the tightening force of the bolt 5 can appear.
[0020]
Also, several key grooves 6 are formed on each end plate 3 of the upper pile 1 and the lower pile 2 so as to coincide with each other at the rotated position. A wedge-shaped key member 7 for preventing rotation is fixed to the key groove 6 by driving.
In this way, by connecting the keyway 6 of the upper pile end plate 3 and the keyway 6 of the lower pile end plate 3 by the key member 7 at the position after the rotation of the piles 1 and 2, Reverse rotation is prevented, and the bolt 5 is prevented from coming off from the large diameter portion 31.
When the bending force is applied to the pile, the key member 7 may come off. Therefore, as shown in FIG. 2C, the key member 7 is formed in a vertical H-shape, and the key groove 6 is formed. Can be formed in the same shape.
[0021]
The upper pile 1 and the lower pile 2 are made of a concrete pile such as a prestressed concrete pile, and an end plate 3 is provided at an end thereof.
A plurality of tension tap holes 4 used when prestressing the concrete pile are formed at equal intervals in the end plate 3 so as to be adjacent to the PC steel rod 8. A plurality of bolts 5 are fastened to 4 with the shaft 52 slightly protruding.
The length of the protruding shaft portion 52 is set to be slightly longer than the thickness of a flange portion 33 of the large-diameter groove portion 32 described later.
[0022]
On the other hand, the large-diameter portion 31, the large-diameter groove 32, and the flange portion protruding from the front edge of the large-diameter groove 32 are provided at positions facing the bolts 5 of the other end plate 3. 33 are formed.
The large-diameter portion 31 is formed so as to penetrate the end plate 3, and the large-diameter groove portion 32 is formed so as to extend the large-diameter portion 31 in the circumferential direction of the end plate 3 except for the flange portion 33. . In this case, in the plurality of large diameter portions 31, the large diameter groove portions 32 extend in the same direction.
In the case of this embodiment (the same applies to the embodiment shown in FIG. 4 described later), the upper pile 1 and the lower pile 2 are connected by rotating the upper pile 1 counterclockwise with respect to the lower pile 2 in plan view. In addition, as in the embodiment shown in FIG. 5 described later, the upper pile 1 and the lower pile 2 are rotated by rotating the upper pile 1 clockwise with respect to the lower pile 2 as seen in a plan view. It can also be connected.
When connecting the upper pile 1 and the lower pile 2, as shown in FIGS. 2 and 3, a plurality of bolts 5 are inserted into the large diameter portion 31 of the mating end plate 3, and the upper pile 1 is rotated in that state. By doing so, the bolt head 51 is moved to the large-diameter groove 32, and the end plates 3 of the upper pile 1 and the lower pile 2 are fixed to each other.
By driving the key member 7 into the key groove 6 of the upper and lower end plates 3 at the position after the pile is rotated, the pile is prevented from rotating in the reverse direction, and the bolt 5 is prevented from coming off from the large diameter portion 31.
[0023]
On the other hand, as shown in FIG. 4, the large diameter portion 31, the large diameter groove portion 32 and the flange portion 33, or the bolt 5 can be formed only on one of the end plates 3 of the upper pile 1 and the lower pile 2. .
That is, the bolt 5 is screwed into the tension tap hole 4 of the one end plate 3 of the upper pile 1 or the lower pile 2, and the large-diameter portion 31 and the large-diameter groove are provided at positions of the other end plate 3 facing the bolt 5. 32 and a flange 33 are formed, and the bolt 5 is inserted into the large diameter portion 31 of the mating end plate 3 to rotate the upper pile 1.
The end plate 3 forming the large diameter portion 31, the large diameter groove portion 32 and the flange portion 33 is desirably slightly thicker than the end plate 3 on the bolt 5 side in consideration of the acting bending and tensile force. .
By forming the large-diameter portion 31, the large-diameter groove portion 32, and the flange portion 33 on one end plate 3 and the bolts 5 on the other end plate 3, the ends of the upper pile 1 and the lower pile 2 are thus formed. The plates 3 can be easily fixed via the bolts 5.
[0024]
Further, the connection structure of piles according to the present invention can be applied to a combination of steel pipe piles or a combination of steel pipe piles and concrete piles.
That is, as shown in FIG. 5, an annular end plate 3 is fixed to an end of a tubular steel pipe pile by welding or the like, and, for example, the large diameter portion 31 is attached to the end plate 3 of the upper pile 1. The large diameter groove portion 32 and the flange portion 33 are formed, and a bolt hole is formed in the annular end plate 3 of the lower pile 2 to screw the bolt 5.
When connecting the upper stake 1 and the lower stake 2, the plurality of bolts 5 are inserted into the large-diameter portion 31 of the mating end plate 3, and the upper stake 1 is rotated in this state so that the bolt head 51 is connected. The transition is made to the large-diameter groove portion 32, and the end plates 3 of the upper pile 1 and the lower pile 2 are fixed to each other.
Further, by driving the key member 7 into the key groove 6 of the upper and lower end plates 3 at the position after rotation of the pile, reverse rotation of the pile is prevented, and the bolt 5 is prevented from coming off from the large diameter portion 31.
[0025]
Thus, the connection structure of the pile according to the present embodiment is such that the bolt 5 is screwed into the tension tap hole 4 formed in the end plate 3 and the bolt 5 A large-diameter portion 31 into which the head portion 51 is inserted, a large-diameter groove portion 32 communicating with the large-diameter portion 31 and allowing the circumferential movement of the bolt head portion 51, and a shaft portion of the bolt 5 from the large-diameter groove portion 32 A flange portion 33 is formed to protrude so as to sandwich the bolt 52, and forms a flange portion 33 for hanging the head portion 51 of the transferred bolt 5. The bolt 5 is inserted into the large-diameter portion 31 of the mating end plate 3 to rotate the pile. By moving the bolt head 51 to the large-diameter groove 32 and fixing the end plates 3 to each other, the end plates 3 of the upper pile 1 and the lower pile 2 can be easily fixed via the bolts 5. Thereby, the connection between the upper pile 1 and the lower pile 2 can be performed quickly and inexpensively, and the outer periphery of the pile can be connected. Since there is no projection, without hindrance pile penetration work pile diameter as constant can be embedded in the ground to.
Then, a bolt 5 is screwed into the tension tap hole 4 of each end plate 3 of the upper pile 1 and the lower pile 2, and a large diameter portion 31 and a large diameter groove 32 are provided at positions of each end plate 3 facing the bolt 5. A flange 33 is formed, and the bolt 5 is inserted into the large-diameter portion 31 of the mating end plate 3 and the pile is rotated, so that the end plates 3 of the upper pile 1 and the lower pile 2 are connected to each other by the bolt 5. And the connection of the piles can be performed more firmly.
In this case, by using the tension tap hole 4 as the bolt hole, the number of working steps can be reduced by using the tension tap hole 4 formed in the end plate 3 of the prestressed concrete pile in advance.
Further, the connection structure of the pile according to the present invention can strongly connect the steel pipe pile and the prestressed concrete pile, and furthermore, since the connection of the pile can be performed easily and in a short time, the construction efficiency of the pile is greatly improved. Can be improved.
[0026]
As mentioned above, although the Example of this invention was described, the connection structure of the pile of this invention is not limited to the structure described in this Example, The structure described in each Example is suitably combined, The configuration can be appropriately changed within a range that does not deviate from the purpose, such as by appropriately using a steel material or cast iron.
[0027]
【The invention's effect】
According to the pile connection structure of the present invention, the bolt is screwed into the bolt hole formed in the end plate, and the large-diameter portion into which the head of the bolt is inserted at a position facing the bolt on the mating end plate. A large-diameter groove communicating with the large-diameter portion and allowing the bolt head to shift in the circumferential direction; and a projecting portion protruding from the large-diameter groove so as to sandwich the bolt shaft, and hooking the transferred bolt head. By forming a flange part to stop, inserting the bolt into the large diameter part of the mating end plate and rotating the pile, the bolt head is shifted to the large diameter groove part and the end plates are fixed, The end plates of the upper pile and the lower pile can be easily fixed to each other via bolts, thereby making it possible to quickly and inexpensively connect the upper pile and the lower pile, and to projecting on the outer periphery of the pile. Since there is no object, the pile can be buried in the ground without hindering the penetration work with a constant pile diameter.
Further, the connection structure of the pile according to the present invention can strongly connect the steel pipe pile and the prestressed concrete pile, and furthermore, since the connection of the pile can be performed easily and in a short time, the construction efficiency of the pile is greatly improved. Can be improved.
[0028]
In this case, by using a tension tap hole as the bolt hole, it is possible to reduce the number of construction steps by using the tension tap hole formed in the end plate of the prestressed concrete pile in advance.
[0029]
In addition, a bolt is screwed into a bolt hole of each end plate of the upper pile and the lower pile, and a large-diameter portion, a large-diameter groove portion, and a flange portion are formed at positions facing the bolts of each end plate. By rotating the pile by mutually inserting it into the large diameter portion of the end plate, the end plates of the upper pile and the lower pile can be fixed to each other with bolts, and the pile can be connected more firmly.
[0030]
In addition, a bolt is screwed into a bolt hole of one end plate of the upper pile or the lower pile, and a large-diameter portion, a large-diameter groove portion, and a flange portion are formed at positions facing the bolts of the other end plate. By rotating the pile by mutually inserting it into the large diameter portion of the mating end plate, the end plates of the upper pile and the lower pile can be easily fixed via bolts.
[0031]
Further, by forming a plastically deformable layer on one side of the position of the flange portion facing the lower surface of the bolt head, the bolt (bolt head) moves from the large-diameter portion of the mating end plate to the large-diameter groove portion. Sometimes, the lower surface of the bolt head comes into contact with the plastically deformable layer and rotates in a specific direction (the direction in which the bolt is tightened) due to its frictional resistance, so that a tightening force by the bolt can appear.
[0032]
Further, a key groove corresponding to the rotated position is formed on each end plate of the upper pile and the lower pile, and a key member for preventing rotation is fixed to the key groove, so that the upper and lower piles are rotated at the rotated position. Can be fixed to prevent reverse rotation of the pile and prevent the bolt from coming off from the large diameter portion.
[Brief description of the drawings]
1A and 1B show an embodiment of a connection structure of a pile according to the present invention, wherein FIG. 1A is an enlarged plan view of a main part of an end plate of the pile, and FIG. 1B is a large diameter portion and a large diameter as viewed from the back side of the end plate. (B ′) is a front view of the large-diameter portion and the large-diameter groove viewed from the back side of the end plate showing a state in which a plastic deformation layer is formed, and (c) is an enlarged cross-sectional view of a main part of the pile. .
FIG. 2 is an enlarged sectional view of a main part showing a connection step of a connection structure of the pile of the embodiment.
FIG. 3 is a front view of the end plate of the upper pile and the end plate of the lower pile as viewed from the front side, respectively.
FIG. 4 is a front view of an end plate of an upper pile and an end plate of a lower pile viewed from the front side according to another embodiment.
5A and 5B show a connection structure of a steel pipe pile, FIG. 5A is a bottom view of an end plate of an upper pile, and FIG. 5B is a cross-sectional view showing a connection between an upper pile and a lower pile.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper pile 2 Lower pile 3 End plate 31 Large diameter part 32 Large diameter groove 33 Flange part 33a Plastic deformation layer 4 Tapped hole for tension 5 Bolt 51 Head 52 Shaft part 6 Key groove 7 Key member 8 PC steel rod

Claims

In a pile connection structure for connecting an upper pile and a lower pile via respective end plates, a bolt is screwed into a bolt hole formed in the end plate, and a bolt is provided at a position facing the bolt on the other end plate. A large-diameter portion into which the head of the bolt is inserted, a large-diameter groove portion communicating with the large-diameter portion and allowing the circumferential movement of the bolt head, and protruding from the large-diameter groove portion so as to sandwich the bolt shaft portion. A flange is formed to hook the head of the transferred bolt, and the bolt is inserted into the large-diameter portion of the mating end plate to rotate the pile, thereby shifting the bolt head to the large-diameter groove. A connection structure for piles, wherein end plates are fixed to each other.

The connection structure for a pile according to claim 1, wherein a tension tap hole is used as the bolt hole.

A bolt is screwed into a bolt hole of each end plate of the upper pile and the lower pile, and a large-diameter portion, a large-diameter groove portion, and a flange portion are formed at positions of the bolts of each end plate facing each other. The pile connection structure according to claim 1 or 2, wherein the pile is rotated by inserting the pile into the large-diameter portion of the pile.

A bolt is screwed into a bolt hole of one end plate of the upper pile or the lower pile, and a large-diameter portion, a large-diameter groove portion, and a flange portion are formed at positions facing the bolts of the other end plate. The pile connection structure according to claim 1 or 2, wherein the pile is rotated by being mutually inserted into the large diameter portion of the end plate.

5. The connection structure for piles according to claim 1, wherein a plastically deformable layer is formed on one side of a position of the flange portion facing the lower surface of the bolt head.

3. A key groove corresponding to a rotated position is formed on each end plate of the upper pile and the lower pile, and a key member for preventing rotation is fixed to the key groove. The connection structure for piles according to 3, 4, or 5.