JP2007197975A - Structure and method for connecting pile head part and precast girder together - Google Patents

Structure and method for connecting pile head part and precast girder together Download PDF

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JP2007197975A
JP2007197975A JP2006016697A JP2006016697A JP2007197975A JP 2007197975 A JP2007197975 A JP 2007197975A JP 2006016697 A JP2006016697 A JP 2006016697A JP 2006016697 A JP2006016697 A JP 2006016697A JP 2007197975 A JP2007197975 A JP 2007197975A
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pile head
pile
hole
precast
precast girder
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JP4750562B2 (en
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Atsushi Kawada
淳 川田
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Taisei Corp
大成建設株式会社
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<P>PROBLEM TO BE SOLVED: To provide a structure for connecting a pile head part and a precast girder together, which has good constructibility and high strength, and a method for connecting them together. <P>SOLUTION: A hole 11, which has such a shape as to be widened toward an end, from one side of the precast girder 1 to the other side subject to the insertion of the pile 9, is formed in the place, to which the pile head part 91 is to be connected, of the precast girder 1; the pile head part 91 is loosely fitted into the hole 11; and the precast girder 1 and the pile head part 91 are connected together by means of a filler 8. In this case, a pipe body 2A with an exterior wall surface shape corresponding to the shape of the interior wall surface 11c of the hole 11 is mounted in the hole 11; a dowel bar 3 is mounted on the pipe body 2A; a part 3a protruding to the outside of the dowel bar 3 is embedded in a precast floor slab 1; and a part 3b protruding to the inside of the dowel bar 3 is embedded in the filler 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、杭頭部とプレキャスト桁との接続構造と、その接続方法に関する。   The present invention relates to a connection structure between a pile head and a precast girder and a connection method thereof.

杭頭部と上部構造の基礎(桁や床版)との接続構造は、その固定度により、剛結合とピン結合に大別され、杭に作用する鉛直荷重により、さらに、剛結合とピン結合の中間の結合構造もある。剛結合構造は、例えば杭径程度を上部構造の基礎内に埋め込むとともに、杭頭と基礎の双方に埋め込まれた杭頭補強筋によってその接続強度をより強固にするものである。剛結合構造を適用する場合には、杭頭に生じる曲げモーメントが上部構造の基礎に伝達されるため、杭と接続される基礎の構造(配筋形態や基礎の厚み等)は、基礎自体に生じる曲げモーメントに加えて杭頭から伝達される曲げモーメントにも抗し得る構造とされる必要がある。しかし、剛結合構造の最大のメリットは、杭が基礎に強固に拘束されるため、杭頭の水平変位量を少なくすることができる点である。したがって、例えば、インフラ施設の一つである橋梁や橋梁桁を支持する橋台などと杭との接続構造は、道路橋示方書(日本道路協会)に準拠した上記する剛結合構造にて設計/施工がおこなわれているのが一般的である。   The connection structure between the pile head and the foundation of the superstructure (girder and floor slab) is roughly divided into rigid and pin connections depending on the degree of fixation. There is also an intermediate bond structure. For example, the rigid coupling structure embeds the pile diameter in the foundation of the upper structure and further strengthens the connection strength by the pile head reinforcing bars embedded in both the pile head and the foundation. When a rigid connection structure is applied, the bending moment generated at the head of the pile is transmitted to the foundation of the superstructure, so the structure of the foundation connected to the pile (such as bar arrangement and foundation thickness) It is necessary to have a structure that can resist the bending moment transmitted from the pile head in addition to the generated bending moment. However, the greatest merit of the rigid coupling structure is that the horizontal displacement of the pile head can be reduced because the pile is firmly bound to the foundation. Therefore, for example, the connection structure between the piles that support one of the infrastructure facilities, such as bridges and bridge girders, and piles is designed / constructed using the rigid connection structure described above in accordance with the Road Bridge Specification (Japan Road Association). Is generally performed.

一方、ピン結合構造は、例えば杭頭の10cm程度を基礎内に埋め込むだけの極めて簡易な接続構造であり、したがって、杭頭に生じる曲げモーメントが基礎に伝達されることはなく、かかる曲げモーメントをも勘案した基礎の設計をおこなう必要はない。尤も、ピン結合構造であっても、杭頭には杭頭補強筋が配筋される場合もある。その一方で、杭頭が基礎に強固に拘束されていないことから、杭頭の水平変位量が剛結合構造に比して大きくなってしまうデメリットがある。したがって、かかるピン結合構造は、杭頭の水平変位量を厳格に低減する必要性がない構造物、例えば一般のビルや住宅等にて適用されている。   On the other hand, the pin coupling structure is an extremely simple connection structure in which, for example, about 10 cm of the pile head is embedded in the foundation. Therefore, the bending moment generated in the pile head is not transmitted to the foundation, and the bending moment is There is no need to design the foundation in consideration of the above. However, even if it is a pin coupling structure, a pile head reinforcing bar may be arranged at the pile head. On the other hand, since the pile head is not firmly restrained by the foundation, there is a demerit that the horizontal displacement of the pile head becomes larger than that of the rigid coupling structure. Therefore, such a pin coupling structure is applied to a structure that does not need to strictly reduce the horizontal displacement of the pile head, such as a general building or a house.

上記するように、剛結合構造にて杭頭部と上部構造の基礎とを接続する場合、杭頭部を杭径程度基礎内に埋め込む必要があるとともに、杭頭補強筋を設置する必要がある。したがって、杭頭部と基礎配筋との干渉を回避する必要が生じ、干渉部の基礎配筋を曲げ加工したり、干渉部の基礎配筋を切断し、杭頭部を囲繞するように切断部を補強するための配筋を別途設けるといった作業が余儀なくされる。さらには、杭頭部と基礎との接続部にて配筋が錯綜することにより、基礎コンクリートの回り込み不良といった懸念もある。   As mentioned above, when connecting the pile head and the foundation of the superstructure with a rigid connection structure, it is necessary to embed the pile head in the foundation to the extent of the pile diameter and to install a pile head reinforcement . Therefore, it is necessary to avoid the interference between the pile head and the foundation reinforcement. Bending the foundation reinforcement in the interference section or cutting the foundation reinforcement in the interference section so as to surround the pile head. An operation of separately providing reinforcing bars for reinforcing the portion is unavoidable. Furthermore, there is also a concern that the foundation concrete may be poorly wrapped due to a complicated arrangement of bars at the connection between the pile head and the foundation.

上記の理由から、杭施工〜基礎の施工に至る施工性の低下や工期の遅延が招来され、杭と基礎との接続部の品質低下への懸念も併せて、杭頭部と基礎との接続構造および接続方法の改善が模索されていた。かかる改善技術として、上部構造の桁や床版等の基礎をプレキャスト化する技術が適用されるに至っている。これは、工場等にてコンクリート製の桁や床版を予め製作し(プレキャスト桁、プレキャスト床版)、施工ヤードにて既に設置されている杭にかかるプレキャスト部材を設置するものである。   For the above reasons, the workability from the pile construction to the foundation construction is reduced and the construction period is delayed, and the connection between the pile head and the foundation is accompanied by concerns about the quality deterioration of the connection between the pile and the foundation. Improvements in structure and connection methods were sought. As such an improvement technique, a technique for precasting a foundation such as a girder of a superstructure or a floor slab has been applied. In this method, concrete girders and floor slabs are manufactured in advance at a factory or the like (precast girders, precast floor slabs), and precast members are installed on piles already installed in a construction yard.

ところで、コンクリート製のプレキャスト部材と杭頭部との接続構造およびその施工方法に関する従来技術として、特許文献1を挙げることができる。この技術は、プレキャスト部材の内部に筒状金属板を埋め込んでおき、この筒状金属板内にコンクリート杭を挿入設置するものである。   By the way, patent document 1 can be mentioned as a prior art regarding the connection structure of a concrete precast member, and a pile head, and its construction method. In this technique, a cylindrical metal plate is embedded in a precast member, and a concrete pile is inserted and installed in the cylindrical metal plate.

一方、コンクリート製のプレキャスト部材ではなく、鋼製桁と杭とを接続してなる構造体もある。かかる鋼製桁と杭頭部との接続構造に関する従来技術として、例えば特許文献2を挙げることができる。この接続構造では、井桁状の鋼製桁の格点に円筒状の杭挿入部を設けておき、この円筒部に杭を挿入するとともに円筒部内にモルタルないしはコンクリートを充填することにより、鋼製桁と杭との一体化を図っている。
特開2003−27418号公報特開2002−146704号公報
一方、コンクリート製のプレキャスト部材ではなく、鋼製桁と杭とを接続してなる構造体もある。かかる鋼製桁と杭頭部との接続構造に関する従来技術として、例えば特許文献2を挙げることができる。この接続構造では、井桁状の鋼製桁の格点に円筒状の杭挿入部を設けておき、この円筒部に杭を挿入するとともに円筒部内にモルタルないしはコンクリートを充填することにより、鋼製桁と杭との一体化を図っている。
特開2003−27418号公報特開2002−146704号公報
一方、コンクリート製のプレキャスト部材ではなく、鋼製桁と杭とを接続してなる構造体もある。かかる鋼製桁と杭頭部との接続構造に関する従来技術として、例えば特許文献2を挙げることができる。この接続構造では、井桁状の鋼製桁の格点に円筒状の杭挿入部を設けておき、この円筒部に杭を挿入するとともに円筒部内にモルタルないしはコンクリートを充填することにより、鋼製桁と杭との一体化を図っている。
特開2003−27418号公報特開2002−146704号公報
On the other hand, there is a structure in which a steel girder and a pile are connected instead of a concrete precast member. For example, Patent Document 2 can be cited as a conventional technique related to the connection structure between the steel girder and the pile head. In this connection structure, a cylindrical pile insertion part is provided at the point of a cross-girder-shaped steel girder, and a steel girder is inserted by inserting a pile into this cylindrical part and filling the cylindrical part with mortar or concrete. And integration with piles. On the other hand, there is a structure in which a steel girder and a pile are connected instead of a concrete precast member. For example, Patent Document 2 can be cited as a conventional technique related to the connection structure between the steel girder and the pile head. In this connection structure, a cylindrical pile insertion part is provided at the point of a cross-girder-shaped steel girder, and a steel girder is inserted by inserting a pile into this cylindrical part and filling the cylindrical part with mortar or concrete. And integration with piles.
JP 2003-27418 A JP 2003-27418 A JP 2002-146704 A JP 2002-146704 A

特許文献1に開示のプレキャスト部材と杭頭部との接続構造、および特許文献2に開示の鋼製桁と杭頭部との接続構造によれば、接続部における十分な強度を確保した上で、施工性の向上を図ることができる。しかし、杭頭部が挿入されるプレキャスト部材に設けられた孔ないしは鋼製桁に設けられた孔が円筒状であることから、杭を該円筒内に挿入する際に高い位置決め精度が要求され、実際の挿入施工は困難を極める。かかる杭挿入時の困難性を回避するために、円筒内部の孔径を大きく設定するという方策もあるが、その場合には、円筒内に充填する充填材量が増加することとなり、結果として施工性の低下にも繋がる。   According to the connection structure between the precast member and the pile head disclosed in Patent Document 1 and the connection structure between the steel girder and the pile head disclosed in Patent Document 2, after securing sufficient strength in the connection portion The workability can be improved. However, since the hole provided in the precast member into which the pile head is inserted or the hole provided in the steel girder is cylindrical, high positioning accuracy is required when inserting the pile into the cylinder, The actual insertion work is extremely difficult. In order to avoid such difficulties when inserting piles, there is a measure to set the hole diameter inside the cylinder large, but in that case, the amount of filler to be filled in the cylinder will increase, resulting in workability. It also leads to a decline.

本発明は、上記する問題に鑑みてなされたものであり、プレキャスト桁と杭頭部との接続時の施工性もよく、さらには、強度の高い接続構造を備えた杭頭部とプレキャスト桁との接続構造、及び、その接続方法を提供することを目的とする。   The present invention has been made in view of the above-mentioned problems, has good workability when connecting the precast girder and the pile head, and further, the pile head and the precast girder having a high-strength connection structure. It is an object to provide a connection structure and a connection method thereof.

前記目的を達成すべく、本発明による杭頭部とプレキャスト桁との接続構造は、杭頭部とコンクリート製のプレキャスト桁との接続構造であって、前記プレキャスト桁のうち、杭頭部が接続される箇所には、該プレキャスト桁の一方面から、杭が挿入される側の他方面に向かって末広がり形状の孔が形成されており、該孔に杭頭部が遊嵌されるとともに充填材にてプレキャスト桁と杭頭部が接続されていることを特徴とする。   In order to achieve the above object, the connection structure between the pile head and the precast girder according to the present invention is a connection structure between the pile head and the concrete precast girder, and the pile head is connected to the precast girder. A hole having a divergent shape is formed from one surface of the precast girder toward the other surface on the side where the pile is inserted, and the pile head is loosely fitted in the hole and a filler. The precast girder and the pile head are connected at.

プレキャスト桁は、鉄筋コンクリート製やプレストレストコンクリート製からなり、桁の形状は、その断面が矩形、台形などの適宜の形状を選定できる。また、複数の桁を予め井桁に組んだ状態であってもよい。また、本発明の接続構造の対象となる杭は、鋼管杭、PHC杭、PC杭、場所打ちRC杭、H鋼杭など、杭全般がその対象である。   The precast girder is made of reinforced concrete or prestressed concrete, and the shape of the girder can be selected from appropriate shapes such as a rectangular or trapezoidal cross section. Further, a state in which a plurality of digits are previously assembled in a well digit may be used. Moreover, the pile used as the object of the connection structure of this invention is the whole piles, such as a steel pipe pile, a PHC pile, a PC pile, a cast-in-place RC pile, and an H steel pile.

プレキャスト桁には、杭頭部が挿入(遊嵌)される孔が形成されている。この孔の形状は、プレキャスト桁の上面から、杭が挿入される側の下面に向かって末広がりの形状、すなわち、下方に向かって孔の大きさが大きくなるように成形されている。孔の形状の実施形態としては、切頭円錐型、切頭角錐型など、プレキャスト桁の下面に向かって末広がり形状であれば適宜の形状を選定することができる。なお、プレキャスト桁の上面〜下面に孔が貫通している形態のほかに、上面を閉塞させ、桁の途中〜下面に末広がり形状の孔を形成しておき、閉塞された上面には、充填材の充填口を設けた形態であってもよい。   The precast girder has a hole into which the pile head is inserted (freely fitted). The shape of the hole is shaped so as to expand from the upper surface of the precast girder toward the lower surface on the side where the pile is inserted, that is, the size of the hole increases downward. As an embodiment of the shape of the hole, an appropriate shape can be selected as long as the shape is divergent toward the lower surface of the precast girder, such as a truncated cone shape and a truncated pyramid shape. In addition to the form in which the hole penetrates from the upper surface to the lower surface of the precast girder, the upper surface is closed, and a hole having a divergent shape is formed in the middle to the lower surface of the girder. The form which provided the filling port of may be sufficient.

プレキャスト桁の末広がり形状の孔に杭頭部が所定長さ埋め込まれた状態で、該孔内にモルタルやコンクリートなどの充填材が充填され、充填材が硬化することにより杭頭部とプレキャスト桁とが一体化される。なお、杭頭部に杭頭補強筋を設置した後に充填材を充填/硬化させることにより、本発明の接続構造を形成することもできる。   In a state where the pile head is embedded in a hole having a wide shape at the end of the precast girder, a filling material such as mortar or concrete is filled in the hole, and the pile material and the precast girder Are integrated. In addition, the connection structure of the present invention can be formed by filling / curing the filler after installing the pile head reinforcing bars on the pile head.

プレキャスト桁に形成する杭頭部遊嵌用の孔が、円筒状ではなく、該桁の上面から下面に向かって末広がり形状に成形されていることの利点としては、接続部の強度の向上と、施工性の向上が挙げられる。具体的には、末広がり形状の孔とすることにより、杭頭部と該孔の内壁面とを接続する充填材と孔の内壁面との付着面積が円筒状の孔に比して広くなり、したがって、付着強度を高めることとなる。すなわち、孔の形状により付着強度を容易に高めることが可能となり、付着強度の高い高性能な充填材を使用する必要がなくなる。さらに、鉛直荷重に対する杭の押し抜きせん断に対し、孔の内壁形状が縦断面的にくさび型となっていることから、押し抜きせん断時の破壊線と孔の内壁線とが直交ないしは略直交するように交差し得ることとなり、せん断耐力も向上させることができる。   As an advantage that the hole for the pile head loosely fitting formed in the precast girder is not cylindrical, but shaped in a divergent shape from the upper surface to the lower surface of the girder, the strength of the connecting portion is improved, Improvement of workability can be mentioned. Specifically, by making the hole in a divergent shape, the adhesion area between the pile head and the inner wall surface of the hole and the inner wall surface of the hole becomes wider compared to a cylindrical hole, Therefore, the adhesion strength is increased. That is, it is possible to easily increase the adhesion strength depending on the shape of the hole, and it is not necessary to use a high-performance filler having a high adhesion strength. Furthermore, since the inner wall shape of the hole is wedge-shaped in longitudinal section with respect to the punching shear of the pile against vertical load, the fracture line at the time of punching shear and the inner wall line of the hole are orthogonal or substantially orthogonal As a result, the shear strength can be improved.

また、プレキャスト桁を吊り降ろしながら孔に杭頭部を挿入する際に、初期の孔の大きさが比較的大きくなっていることから、挿入時の施工誤差の許容範囲を広く設定することが可能となり、杭頭挿入施工時の施工性を格段に向上させることに繋がる。なお、杭頭挿入時の施工誤差を吸収しながらも、孔の形状は上部に向かって縮小していることから、孔の内壁面で杭頭部を案内しながら、杭頭部を孔の所定位置に位置決めすることができる。したがって、施工性を高めることに加えて、杭頭部と孔との高い位置決め精度を確保することが可能となる。   In addition, when inserting the pile head into the hole while hanging the precast girder, the initial hole size is relatively large, so it is possible to set a wide tolerance for construction errors during insertion Thus, the workability at the time of pile head insertion construction is greatly improved. In addition, while absorbing the construction error at the time of pile head insertion, the shape of the hole is reduced toward the top, so the pile head is fixed to the predetermined hole of the hole while guiding the pile head on the inner wall surface of the hole. Can be positioned. Therefore, in addition to improving workability, it is possible to ensure high positioning accuracy between the pile head and the hole.

また、本発明による杭頭部とプレキャスト桁との接続構造の好ましい実施形態は、前記杭頭部とプレキャスト桁との接続構造において、前記孔の内壁面には、該内壁面の形状に一致する外壁面形状を有する管体が取付けられており、該管体の外壁面には第1の凸部が形成されており、管体の内壁面には第2の凸部が形成されており、第1の凸部がプレキャスト桁の前記孔の内壁面に埋め込まれていることを特徴とする。   Moreover, the preferable embodiment of the connection structure between the pile head and the precast girder according to the present invention is the connection structure between the pile head and the precast girder, and the inner wall surface of the hole matches the shape of the inner wall surface. A tubular body having an outer wall surface shape is attached, a first convex portion is formed on the outer wall surface of the tubular body, and a second convex portion is formed on the inner wall surface of the tubular body, The first convex portion is embedded in the inner wall surface of the hole of the precast girder.

本発明の接続構造においては、プレキャスト桁に形成された孔の内壁面の形状に一致する外壁面形状を有する管体で孔を補強することにより、接続部の強度をより高めるものである。ここで、管体は、例えば鋼管を使用することができる。   In the connection structure of the present invention, the strength of the connection portion is further increased by reinforcing the hole with a tubular body having an outer wall surface shape that matches the shape of the inner wall surface of the hole formed in the precast girder. Here, a steel pipe can be used, for example.

この管体には、その外壁面と内壁面に適宜の形状の凸部が取付けられている。外壁面に設けられた凸部は、プレキャスト桁のコンクリート内部に埋め込まれながらプレキャスト桁と一体化される。一方、管体の内壁面に設けられた凸部は、管体内部に杭頭部が遊嵌された後で充填される充填材と管体との一体化の際に、その接続強度を高めることに繋がる。   Protrusions having an appropriate shape are attached to the outer wall surface and the inner wall surface of the tube. The convex portion provided on the outer wall surface is integrated with the precast girder while being embedded in the concrete of the precast girder. On the other hand, the convex portion provided on the inner wall surface of the tubular body increases its connection strength when the filler and the tubular body are integrated after the pile head is loosely fitted inside the tubular body. It leads to.

ここで、凸部の形状としては、ジベル筋を使用することができる。ジベル筋として頭付きのスタッドジベルを使用することでその接続強度をより高めることができる。このジベル筋を管体の内外壁面にそれぞれ溶接等にて固設しておき、プレキャスト桁を製作する際に、この管体を孔位置に設置した状態でコンクリートの打設をおこない、プレキャスト桁と管体の一体化を図る。また、予め穿孔されたボルト孔にねじ溝が切られたジベル筋を螺合させる方法であってもよい。   Here, as the shape of the convex portion, a gibber line can be used. The connection strength can be further increased by using a stud gibber with a head as the gibber muscle. The gibber is fixed to the inner and outer wall surfaces of the pipe by welding, etc., and when producing the precast girder, the concrete is placed with the pipe installed in the hole position. Integrate the tube. Moreover, the method of screwing the gibber muscle where the thread groove was cut into the bolt hole drilled previously may be sufficient.

また、凸部の形状として、管体の内外壁面に複数のリング状の棒鋼を間隔を置きながら取付けた形態や、1つの連続した棒鋼を螺旋状に壁面に取付けた形態を適用することもできる。   Further, as the shape of the convex portion, it is possible to apply a form in which a plurality of ring-shaped steel bars are attached to the inner and outer wall surfaces of the tubular body at intervals, or a form in which one continuous steel bar is helically attached to the wall surface. .

さらに、より好ましい実施の形態として、孔に遊嵌される杭頭部の外壁面にも上記するジベル筋や螺旋状ないしはリング状の突起を取付けておくことにより、接続部の接続強度をより高めることが可能となる。ここで、適用される杭が例えば鋼管杭の場合には、該鋼管杭の杭頭部に複数のボルト孔を穿孔しておき、杭頭部をプレキャスト桁の孔に設置した後に、ボルト孔にボルトやジベル筋等を螺合ないしは嵌め込んで充填材を充填/硬化させることもできる。   Furthermore, as a more preferred embodiment, the connection strength of the connecting portion is further increased by attaching the above-mentioned gibel muscles and spiral or ring-shaped protrusions to the outer wall surface of the pile head loosely fitted in the hole. It becomes possible. Here, when the applied pile is, for example, a steel pipe pile, a plurality of bolt holes are drilled in the pile head of the steel pipe pile, and after the pile head is installed in the hole of the precast girder, It is also possible to fill / cure the filler by screwing or fitting bolts or dowel bars.

上記するプレキャスト桁と杭頭部との接続構造を形成後、該プレキャスト桁(例えば井桁状に組み付けられたプレキャスト桁)上に、適宜の上部構造物が構築される。この上部構造物とプレキャスト桁との接続構造は、アンカープレートを介したボルト接合が好適である。上部構造物は、ビルやマンション、上下水道施設や橋梁の橋台など、その構造形態は任意である。   After forming the connection structure between the precast girder and the pile head described above, an appropriate superstructure is constructed on the precast girder (for example, a precast girder assembled in a cross girder shape). The connection structure between the superstructure and the precast girder is preferably bolted via an anchor plate. The structure of the superstructure is arbitrary, such as a building, a condominium, a water and sewage facility, and a bridge abutment.

上記するように、本発明の杭頭部とプレキャスト桁との接続構造、及びかかる接続構造を備えた構造体によれば、接続構造の接続強度を従来の接続構造に比して格段に高めることができるとともに、その施工性も高めることができ、工期の短縮を図ることが可能となる。   As described above, according to the connection structure between the pile head and the precast girder of the present invention, and the structure including such a connection structure, the connection strength of the connection structure is significantly increased as compared with the conventional connection structure. In addition, the workability can be improved and the construction period can be shortened.

また、その他の実施の形態として、杭頭部と井桁状に形成された鋼製桁との接続構造もある。この井桁の格点には、杭が挿入される鋼管が取付けられており、該鋼管の少なくとも内壁面の形状は、上端から、杭が挿入される側の下端に向かって末広がり形状に形成されており、該鋼管内に杭頭部が遊嵌されるとともに充填材にてプレキャスト桁と杭頭部が接続される。   In addition, as another embodiment, there is a connection structure between a pile head and a steel girder formed like a cross girder. The steel pipe into which the pile is inserted is attached to the grade point of this well, and the shape of at least the inner wall surface of the steel pipe is formed in a divergent shape from the upper end toward the lower end on the side where the pile is inserted. The pile head is loosely fitted in the steel pipe, and the precast girder and the pile head are connected by a filler.

上記する形態においても、杭頭部が遊嵌される鋼管の内壁形状が下方に向かって末広がり形状であることにより、その施工性の向上と接続部の強度を高めることができることは、上述の通りである。   Even in the above-described form, the inner wall shape of the steel pipe into which the pile head is loosely fitted is a shape that spreads downward toward the bottom, so that the workability can be improved and the strength of the connecting portion can be increased as described above. It is.

上記の接続構造は、複数の鋼製桁が井桁状に組み付けられ、各格点に設けられたそれぞれの鋼管内に杭頭部が遊嵌された後に、それぞれの鋼管内に充填材が充填/硬化されて接続構造が形成される。既述するように、鋼管の下方の孔の大きさが大きく設定されているため、複数の杭頭部を井桁の各格点の鋼管に遊嵌する際にも、一部の鋼管と杭頭部とが干渉して遊嵌不能となる可能性を極めて低くすることができる。   In the above connection structure, a plurality of steel girders are assembled in a cross-girder shape, and after pile heads are loosely fitted in the respective steel pipes provided at the respective points, the filling material is filled / filled in the respective steel pipes. Cured to form a connection structure. As described above, since the size of the hole below the steel pipe is set to be large, some steel pipes and pile heads are also used when loosely fitting multiple pile heads to the steel pipes of each grade of the cross beam. It is possible to extremely reduce the possibility that the part may interfere and become loosely fitted.

また、鋼管の内壁面において、鋼管内部に突出する凸部を形成することができ、該凸部の形態として、既述するジベル筋や、リング状ないしは螺旋状の突条筋(棒鋼)などがある。   Further, on the inner wall surface of the steel pipe, a convex portion protruding into the steel pipe can be formed. As the form of the convex portion, the above-described gibber streaks, ring-shaped or spiral streaks (bars), etc. is there.

また、さらに他の実施の形態として、杭頭部とプレキャスト床版との接続構造もある。この形態では、プレキャスト床版のうち、杭頭部が接続される複数箇所において、該プレキャスト床版の一方面から杭が挿入される側の他方面に向かって上記と同様の末広がり形状の孔を形成しておき、それぞれの孔に対応する杭頭部を遊嵌し、充填材にてプレキャスト床版と複数の杭の杭頭部が接続される。   As still another embodiment, there is a connection structure between a pile head and a precast floor slab. In this mode, among the precast floor slabs, at a plurality of locations to which the pile heads are connected, holes having a divergent shape similar to the above are formed from one side of the precast floor slab toward the other side where the pile is inserted. The pile heads corresponding to the respective holes are loosely fitted, and the precast floor slab and the pile heads of the plurality of piles are connected by the filler.

さらに、本発明による杭頭部とプレキャスト桁との接続方法は、該プレキャスト桁のうち、杭頭部が接続される箇所には、プレキャスト桁の一方面から、杭が挿入される側の他方面に向かって末広がり形状の孔が形成されている、杭頭部とプレキャスト桁との接続方法であって、杭を対象地盤に設置する第1の工程と、プレキャスト桁を受けるための受材を杭頭部に設置する第2の工程と、杭頭部をプレキャスト桁の孔に遊嵌しながら該プレキャスト桁の下面を受材上に載置する第3の工程と、受材上の杭頭部に凸部を取付ける第4の工程と、前記孔の内部に充填材を充填する第5の工程と、からなることを特徴とする。   Furthermore, the method for connecting the pile head and the precast girder according to the present invention is that the precast girder is connected to the pile head from one side of the precast girder to the other side on the side where the pile is inserted. A method of connecting a pile head and a precast girder, in which a hole having a divergent shape is formed toward the first step, the first step of installing the pile on the target ground, and a pile receiving material for receiving the precast girder A second step of installing on the head, a third step of placing the lower surface of the precast girder on the receiving material while loosely fitting the pile head into the hole of the precast girder, and a pile head on the receiving material It comprises a fourth step of attaching the convex portion to the first portion and a fifth step of filling the inside of the hole with a filler.

杭頭部に予め凸部を取付けた状態で杭頭部をプレキャスト桁の孔に遊嵌すると、凸部が障害となって施工性が低下することから、本発明では、まず、杭を設置した後に杭頭部に受材を取付け、杭頭部をプレキャスト桁の孔に遊嵌して受材上に該プレキャスト桁を載置する。その後に、例えば作業員が孔内に入り、受材を足場としてジベル筋やボルトなどの適宜の凸部を杭頭部の外壁面や内外壁面に取付け、その後に孔内に充填材を充填/硬化させるものである。   When the pile head is loosely fitted in the hole of the precast girder with the convex portion attached in advance to the pile head, the convex portion becomes an obstacle and the workability is lowered. Later, a receiving material is attached to the pile head, the pile head is loosely fitted in the hole of the precast girder, and the precast girder is placed on the receiving material. After that, for example, an operator enters the hole, attaches the receiving material as a scaffold, attaches appropriate convex parts such as gibber bars and bolts to the outer wall surface and inner / outer wall surface of the pile head, and then fills the hole with filler / It is to be cured.

本発明の施工方法によれば、プレキャスト桁に形成された杭頭遊嵌用の孔が下方に向かって末広がり形状となっていることにより、施工性のよい接続構造の構築が可能となる。   According to the construction method of the present invention, it is possible to construct a connection structure with good workability, because the hole for pile head loose fitting formed in the precast girder has a diverging shape downward.

以上の説明から理解できるように、本発明の杭頭部とプレキャスト桁との接続構造、及びその接続方法によれば、杭頭部が遊嵌される孔が上面から下面に向かって末広がり形状に成形されていることにより、杭頭部を孔に遊嵌する際の施工許容誤差を広く取ることが可能となり、しかも、遊嵌された杭頭部は孔の内壁面に沿って孔の上方に案内されるため、施工性を高めることに加えて、孔と杭頭部との位置決め精度を高めることができる。また、本発明の杭頭部とプレキャスト桁との接続構造、及びその接続方法によれば、杭の押し抜きせん断強度や杭頭部との付着強度など、杭頭部と基礎(プレキャスト桁)との接続強度を高めることができる。   As can be understood from the above description, according to the connection structure between the pile head and the precast girder of the present invention, and the connection method thereof, the hole into which the pile head is loosely fitted has a divergent shape from the upper surface toward the lower surface. By being molded, it is possible to widen the construction tolerance when loosely fitting the pile head into the hole, and the loosely fitted pile head is above the hole along the inner wall surface of the hole. Since it is guided, in addition to improving workability, positioning accuracy between the hole and the pile head can be improved. Moreover, according to the connection structure of the pile head of the present invention and the precast girder, and its connection method, the pile head and the foundation (precast girder), such as the punching shear strength of the pile and the adhesion strength with the pile head, etc. The connection strength can be increased.

以下、図面を参照して本発明の実施の形態を説明する。図1は、本発明の杭頭部とプレキャスト桁との接続構造を備えた構造体の一実施の形態を示した側面図を、図2は、図1のII−II矢視図をそれぞれ示している。図3〜図5は、管体の実施の形態を示した斜視図を、図6は、図3の管体を備えた杭頭部とプレキャスト桁との接続構造の他の実施の形態の断面図をそれぞれ示している。図7は、杭頭部とプレキャスト床版との接続構造の一実施の形態を示した斜視図を、図8は、杭頭部と鋼製桁との接続構造の一実施の形態を示した斜視図をそれぞれ示している。なお、図示する構造体は、鋼管杭にて支持された橋梁であるが、本発明の杭頭部とプレキャスト桁との接続構造を備えた構造体が図示する実施の形態に限定されるものでないことは勿論のことである。また、適用される杭は、図示する鋼管杭に限定されるものではなく、PHC杭やPC杭、H鋼杭、場所打ちRC杭など、他の仕様の杭も本発明の対象であることは勿論のことである。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an embodiment of a structure having a connection structure between a pile head and a precast girder according to the present invention, and FIG. 2 is a view taken along arrow II-II in FIG. ing. 3 to 5 are perspective views showing an embodiment of the tubular body, and FIG. 6 is a cross section of another embodiment of a connection structure between a pile head having the tubular body of FIG. 3 and a precast girder. Each figure is shown. FIG. 7 is a perspective view showing an embodiment of a connection structure between a pile head and a precast floor slab, and FIG. 8 shows an embodiment of a connection structure between the pile head and a steel girder. Each perspective view is shown. The illustrated structure is a bridge supported by a steel pipe pile, but the structure having a connection structure between the pile head of the present invention and a precast girder is not limited to the illustrated embodiment. Of course. Moreover, the applied pile is not limited to the illustrated steel pipe pile, and other specifications such as PHC pile, PC pile, H steel pile, cast-in-place RC pile are also objects of the present invention. Of course.

図1は、鋼管杭9,9に支持されたコンクリート製のプレキャスト桁1,1,…が橋梁の縦断方向に向かって複数配設されており、プレキャスト桁1,1間に上部桁Aが設置され、さらに上部桁Aの上方に所定の道路構造を備えたコンクリート製ないしはアスファルト製、ないしはそれらが組み合わされてなる車道Bが設けられてなる構造体100を図示している。ここで、鋼管杭9の杭頭部91は、プレキャスト桁1に形成された孔11内に遊嵌されており、この孔11内に充填材8が充填/硬化されることにより、杭頭部91とプレキャスト桁1との接続構造10が形成されている。   FIG. 1 shows that a plurality of concrete precast girders 1, 1,... Supported by steel pipe piles 9, 9 are arranged in the longitudinal direction of the bridge, and an upper girder A is installed between the precast girders 1, 1. Further, a structure 100 is shown in which a roadway B made of concrete or asphalt having a predetermined road structure above the upper beam A or a combination thereof is provided. Here, the pile head 91 of the steel pipe pile 9 is loosely fitted in the hole 11 formed in the precast girder 1, and the pile 8 is filled / cured in the hole 11, whereby the pile head A connection structure 10 between 91 and the precast girder 1 is formed.

河川に鋼管杭9,9,…を設置する施工方法は、鋼管杭を曳航するとともに杭打設用の起重機船にておこなうことができるし、両対岸から仮設桟橋を張り出し、該桟橋上から杭の打設をおこなうこともできる。   The construction method of installing steel pipe piles 9, 9, ... in the river can be carried out by towing the steel pipe piles and using a hoist ship for driving the piles, extending a temporary jetty from both sides of the river, and piles from above the jetty Can also be placed.

図2は、図1のII−II矢視図である。図示する杭頭部91とプレキャスト桁1との接続構造10は、1本のコンクリート製のプレキャスト桁1と、2本の鋼管杭9,9の杭頭部91,91の接続部の構造である。このプレキャスト桁1には、杭頭部91,91が接続される2箇所に該プレキャスト桁1の上面から下面に向かって末広がり形状の杭頭部遊嵌用の孔11,11が形成されている。この孔11は、上部開口11aと下部開口11bと、切頭円錐形の内壁面11cとから構成されている。一方、孔11に遊嵌される鋼管杭9の杭頭部91にはプレキャスト桁1を受けるための鋼製の受材92が取付けられており、この受材92よりも上方の杭頭部91において、複数のジベル筋93,93,…が取付けられている。ジベル筋93の取付け方法としては、予め杭頭部91に図示しない貫通孔を穿孔しておき、この孔にジベル筋91を嵌め込む方法などがある。なお、ジベル筋91は、図示しない頭付きジベル筋であってもよい。杭頭部91を例えば杭径程度の所定長だけ孔11内に遊嵌させた状態で、上部開口11aからモルタルやコンクリート、樹脂などの充填材8を充填/硬化させる。なお、鋼管杭9の内部には、充填材8の仕切板94が取付けられている。   2 is a view taken in the direction of arrows II-II in FIG. The connection structure 10 between the pile head 91 and the precast girder 1 shown in the figure is a structure of a connection portion between one concrete precast girder 1 and the pile heads 91 and 91 of the two steel pipe piles 9 and 9. . This precast girder 1 is formed with two holes 11, 11 for loosely fitting the pile heads in a divergent shape from the upper surface to the lower surface of the precast girder 1 at two locations where the pile heads 91, 91 are connected. . The hole 11 includes an upper opening 11a, a lower opening 11b, and a truncated conical inner wall surface 11c. On the other hand, a steel receiving material 92 for receiving the precast girder 1 is attached to the pile head 91 of the steel pipe pile 9 that is loosely fitted in the hole 11, and the pile head 91 above the receiving material 92 is attached. , A plurality of gibber muscles 93, 93,... Are attached. As a method for attaching the gibber bar 93, there is a method in which a through hole (not shown) is drilled in the pile head 91 in advance, and the diver bar 91 is fitted into this hole. The gibber muscle 91 may be a headed gibber muscle (not shown). In a state where the pile head 91 is loosely fitted into the hole 11 by a predetermined length, for example, about the pile diameter, the filler 8 such as mortar, concrete, and resin is filled / cured from the upper opening 11a. A partition plate 94 for the filler 8 is attached inside the steel pipe pile 9.

ここで、孔11の内壁面形状やその寸法は、杭頭部91の径や埋め込み長、施工許容誤差などに応じて適宜設定することができる。例えば、杭頭部91を孔11内に遊嵌した際に、杭頭部91の上端と孔11の内壁面11cとの間に充填材8が充填可能な隙間が形成されることは必須であり、また、杭頭部91に取付けられたジベル筋93が内壁面11cと干渉しないような寸法に設定する必要がある。また、下部開口11bの寸法は、杭頭部91を孔11に遊嵌する際に、施工性を阻害しない程度の大きさに設定するのが好ましい。また、末広がり形状の内壁面11cのラインは、杭頭部91が押し抜きせん断される際のせん断破壊線に直交する角度、例えばせん断破壊線が45度の場合には、内壁面11cのラインも45度程度に設定することにより、押し抜きせん断時のせん断耐力をより高めることができる。   Here, the shape of the inner wall surface of the hole 11 and its dimensions can be set as appropriate according to the diameter of the pile head 91, the embedding length, construction tolerance, and the like. For example, when the pile head 91 is loosely fitted in the hole 11, it is essential that a gap that can be filled with the filler 8 is formed between the upper end of the pile head 91 and the inner wall surface 11 c of the hole 11. In addition, it is necessary to set the dimensions such that the dowel bar 93 attached to the pile head 91 does not interfere with the inner wall surface 11c. Moreover, when the pile head 91 is loosely fitted in the hole 11, the size of the lower opening 11 b is preferably set to a size that does not impair the workability. Further, the line of the inner wall surface 11c having a divergent shape is an angle orthogonal to the shear fracture line when the pile head 91 is punched and sheared, for example, when the shear fracture line is 45 degrees, the line of the inner wall surface 11c is also By setting to about 45 degrees, the shear strength during punching shear can be further increased.

なお、図示する実施の形態では、上部開口11aが設けられているが、プレキャスト桁1の上面には充填材8を充填するための比較的小さな開口のみが穿孔された形態であってもよい。   In the illustrated embodiment, the upper opening 11a is provided. However, the upper surface of the precast beam 1 may have a shape in which only a relatively small opening for filling the filler 8 is perforated.

図3〜図5は、プレキャスト桁1の孔11の内壁面11cと一致する外面形状を有し、中空で切頭円錐形の管体の実施形態をそれぞれ示している。なお、各管体は、例えば鋼製素材で成形できる。   3 to 5 show embodiments of hollow, frustoconical tubular bodies, each having an outer surface shape coinciding with the inner wall surface 11c of the hole 11 of the precast girder 1. Each tubular body can be formed of, for example, a steel material.

図3に示す管体2Aは、その側壁にジベル筋3,3,…が壁の内外壁から突出するように取付けられており、外壁面から突出する部分3aは、プレキャスト桁1の孔11内に埋め込まれるようになっており、管体2Aとプレキャスト桁1との接続強度を高める効果を有している。一方、内壁面から突出する部分3bは、その内部に充填される充填材8と、管体2Aとの付着強度(接続強度)を高める効果を有している。   The tube 2A shown in FIG. 3 is attached to the side wall so that the dowels 3, 3,... Protrude from the inner and outer walls of the wall, and the portion 3a protruding from the outer wall surface is in the hole 11 of the precast girder 1. It has an effect of increasing the connection strength between the tubular body 2A and the precast beam 1. On the other hand, the portion 3b protruding from the inner wall surface has an effect of increasing the adhesion strength (connection strength) between the filler 8 filled therein and the tube body 2A.

一方、図4に示す管体2Bは、その内外壁面にそれぞれ複数のリング状の棒鋼4a,…4b,…が溶接にて固設されている。管体2Aと同様に、外壁面に取付けられた棒鋼4aはプレキャスト桁1内に埋め込まれるようになっており、内壁面に取付けられた棒鋼4bは充填材8との接続強度を高めるものである。   On the other hand, a tubular body 2B shown in FIG. 4 has a plurality of ring-shaped steel bars 4a,... 4b,. As with the pipe body 2A, the steel bar 4a attached to the outer wall surface is embedded in the precast girder 1, and the steel bar 4b attached to the inner wall surface increases the connection strength with the filler 8. .

さらに、図5に示す管体2Cは、その内外壁面に螺旋状棒鋼5a,…,5b,…が溶接にて固設されている。   Further, the tubular body 2C shown in FIG. 5 has helical steel bars 5a,..., 5b,.

上記する管体のうち、管体2Aを孔11に一体に取付けてなるプレキャスト桁1と杭頭部との接続構造10Aを図6に示している。管体2Aに取付けられたジベル筋3の外側突出部分3aがプレキャスト桁1内に埋め込まれ、内側突出部分3bが孔11内に充填された充填材8内に埋め込まれている。かかる構成とすることにより、杭頭部91と、充填材8との接続強度、および、充填材8と管体2Aとの接続強度、および管体2Aとプレキャスト桁1との接続強度のすべてを高めることができ、結果として杭頭部91とプレキャスト桁1との接続構造10Aの接続強度を高めることが可能となる。   FIG. 6 shows a connecting structure 10A between the precast girder 1 and the pile head, in which the tubular body 2A is integrally attached to the hole 11 among the tubular bodies described above. An outer projecting portion 3 a of the gibber muscle 3 attached to the tube body 2 A is embedded in the precast beam 1, and an inner projecting portion 3 b is embedded in the filler 8 filled in the hole 11. By adopting such a configuration, all of the connection strength between the pile head 91 and the filler 8, the connection strength between the filler 8 and the tubular body 2A, and the connection strength between the tubular body 2A and the precast girder 1 are obtained. As a result, the connection strength of the connection structure 10A between the pile head 91 and the precast girder 1 can be increased.

次に、上記する杭頭部とプレキャスト桁との接続構造の施工方法を概説する。
まず、対象地盤の所定位置に、所定本数の鋼管杭(ここでは1本のプレキャスト桁に対して2本の鋼管杭)を設置する。鋼管杭の設置方法は、対象地盤の地盤特性や周辺環境への影響等を勘案して、打ち込み工法、埋め込み工法、中掘り工法等、公知の施工方法を適用できる。
Next, the construction method of the connection structure of the above-mentioned pile head and the precast girder will be outlined.
First, a predetermined number of steel pipe piles (here, two steel pipe piles for one precast girder) are installed at predetermined positions on the target ground. As for the installation method of steel pipe piles, a known construction method such as a driving method, an embedding method, a digging method or the like can be applied in consideration of the ground characteristics of the target ground and the influence on the surrounding environment. First, a predetermined number of steel pipe piles (here, two steel pipe piles for one precast girder) are installed at predetermined positions on the target ground. As for the installation method of steel pipe piles, a known construction method such as a driving method , an embedding method, a digging method or the like can be applied in consideration of the ground characteristics of the target ground and the influence on the surrounding environment.

鋼管杭の設置が完了したら、次に、プレキャスト桁を受けるための受材を杭頭部の所定の位置(レベル)に設置する。受材の取付けは、杭の設置が完了した後におこなうのが好ましい。受材の取付けに際しては、杭が対岸に設置されている場合には、足場を組み、足場上で作業員が杭頭上端から開口を有する受材を落とし込み、所定の位置で溶接したり、2枚のリング状の受材を用意しておき、それらの端部同士を杭周面で一致させるように溶接するとともに杭周面とも溶接することにより取付ける方法などがある。一方、河川上に立設する杭に受材を設置する場合は、作業船を利用したり、川岸から張り出した桟橋等を利用して設置することができる。   When the installation of the steel pipe pile is completed, next, a receiving material for receiving the precast girder is installed at a predetermined position (level) of the pile head. The receiving material is preferably attached after the pile installation is completed. When installing the receiving material, if the pile is installed on the opposite shore, build a scaffold and the worker drops the receiving material having an opening from the top of the pile head on the scaffold and welds it at a predetermined position. There is a method in which a ring-shaped receiving material is prepared, and the ends are welded so as to coincide with each other on the pile peripheral surface and are also attached by welding to the pile peripheral surface. On the other hand, when installing the receiving material on the pile standing on the river, it can be installed using a work boat or a jetty extending from the riverbank.

受材を杭頭部に設置した後に、プレキャスト桁の孔に杭頭部を遊嵌しながら該プレキャスト桁の下面を受材上に載置する。この作業においても、対岸に設置されている杭にプレキャスト桁を設置する際には、地面からクレーンのブームを張り出し、ブーム先端からプレキャスト桁を吊り降ろしながら設置する方法や、仮設桟橋が構築されている場合には、該桟橋上のクレーンからプレキャスト桁を吊り降ろしていく方法などがある。   After installing the receiving material on the pile head, the lower surface of the precast beam is placed on the receiving material while loosely fitting the pile head into the hole of the precast beam. In this work as well, when installing a precast girder on a pile installed on the opposite shore, a method of installing a crane boom from the ground and hanging the precast girder from the tip of the boom, and a temporary pier were constructed. If there is, there is a method of hanging a precast girder from a crane on the pier.

受材上にプレキャスト桁を仮置きした後に、今度は、作業員がプレキャスト桁の孔の内部に入り、杭頭部にジベル筋を取付ける。予めジベル筋が貫通するための孔を杭頭部に穿孔しておき、この孔にジベル筋を貫通させ、必要に応じて杭頭部とジベル筋とを溶接したり、孔とジベル筋の双方にねじ溝が切ってある場合には、ジベル筋を孔に螺合させることにより、ジベル筋の取付け施工がおこなわれる。   After temporarily placing the precast girder on the receiving material, this time the worker enters the hole in the precast girder and attaches the gibber bar to the pile head. A hole for penetrating the gibber muscle is drilled in the pile head in advance, the gibber muscle is penetrated through this hole, and if necessary, the pile head and the gibber muscle are welded, or both When the thread groove is cut, the installation work of the gibber is performed by screwing the gibber into the hole.

ジベル筋の取付けが完了した後に、孔の上部開口から充填材を孔内に充填し、その硬化を待って接続構造が完成する。   After the installation of the gibber bar is completed, a filler is filled into the hole from the upper opening of the hole, and the connection structure is completed after the hardening is completed.

本発明の施工方法によれば、プレキャスト桁に形成された杭頭部遊嵌用の孔の下部開口面積が広く設定されており、したがって、杭頭部をプレキャスト桁に形成された孔に遊嵌
する際の施工許容誤差が広くなる。その一方で、孔の内壁面の断面寸法が上方に向かって小さくなっているため、杭頭上端は孔の内壁面に案内された後に、所定レベルで高精度に位置決めされることとなり、したがって高い施工性を実現することができる。
According to the construction method of the present invention, the lower opening area of the hole for the pile head loose fitting formed in the precast girder is set wide, and therefore the pile head is loosely fitted in the hole formed in the precast girder. The tolerance for construction is widened. On the other hand, since the cross-sectional dimension of the inner wall surface of the hole becomes smaller upward, the upper end of the pile head is positioned with high accuracy at a predetermined level after being guided by the inner wall surface of the hole, and therefore high. Workability can be realized.

図7は、杭頭部91とプレキャスト床版6との接続構造10Bを示した図である。予め対象地盤に設置された例えば4本の鋼管杭9,9,…の各杭頭部91,91,…を、プレキャスト床版6に形成された末広がり形状の孔61,61,…に遊嵌し、記述するプレキャスト桁の場合と同様に、その内部に充填材8が充填/硬化されることで接続構造10Bが形成される。なお、孔61内に、図3〜5に示すような管体が一体に埋め込まれてなる実施の形態であってもよいことは勿論のことである。また、プレキャスト床版6上には、ビルや各種の公共施設など、任意の構造物が建設される。   FIG. 7 is a view showing a connection structure 10 </ b> B between the pile head 91 and the precast floor slab 6. The pile heads 91, 91,... Of, for example, four steel pipe piles 9, 9,... Installed in advance on the target ground are loosely fitted into the diverging holes 61, 61,. Then, similarly to the case of the precast girder described, the connecting structure 10B is formed by filling / curing the filler 8 inside. Of course, an embodiment in which a tubular body as shown in FIGS. 3 to 5 is integrally embedded in the hole 61 may be used. On the precast floor slab 6, an arbitrary structure such as a building or various public facilities is constructed.

一方、図8は、鋼製桁71,71,…が井桁に組まれてなる鋼製井桁7の各格点に、鋼製の管体2Dが取付けられ、管体2Dの内部に杭頭部が遊嵌されてなる接続構造10Cを示している。鋼製桁71は、中空の角鋼管やH型鋼、さらには、角鋼管内にコンクリートが充填された形態などを使用できる。管体2Dの内壁面にはジベル筋31,31,…が取付けられており、その内部に充填材8が充填/硬化されている。なお、充填材8は、管体2Dの上部の充填口2D1から充填される。この鋼製井桁7上にも、適宜の構造物が建設される。   On the other hand, FIG. 8 shows a steel pipe 2D attached to each grade of a steel well 7 in which steel girders 71, 71,. The connection structure 10C formed by loosely fitting is shown. The steel girder 71 can be a hollow square steel pipe or H-shaped steel, or a form in which concrete is filled in the square steel pipe. .. Are attached to the inner wall surface of the tubular body 2D, and the filler 8 is filled / cured therein. The filler 8 is filled from the filling port 2D1 at the top of the tube body 2D. An appropriate structure is also constructed on the steel well 7.

以上、本発明の実施の形態を図面を用いて詳述してきたが、具体的な構成はこの実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲における設計変更等があっても、それらは本発明に含まれるものである。   The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

本発明の杭頭部とプレキャスト桁との接続構造を備えた構造体の一実施の形態を示した側面図。 The side view which showed one Embodiment of the structure provided with the connection structure of the pile head and precast girder of this invention. 図1のII−II矢視図。 II-II arrow line view of FIG. 管体の一実施の形態を示した斜視図。 The perspective view which showed one Embodiment of the tubular body. 管体の他の実施の形態を示した斜視図。 The perspective view which showed other embodiment of the tubular body. 管体のさらに他の実施の形態を示した斜視図。 The perspective view which showed other embodiment of the tubular body. 図3の管体を備えた杭頭部とプレキャスト桁との接続構造の他の実施の形態の断面図。 Sectional drawing of other embodiment of the connection structure of the pile head provided with the pipe body of FIG. 3, and a precast girder. 杭頭部とプレキャスト床版との接続構造の一実施の形態を示した斜視図。 The perspective view which showed one Embodiment of the connection structure of a pile head and a precast floor slab. 杭頭部と鋼製桁との接続構造の一実施の形態を示した斜視図。 The perspective view which showed one Embodiment of the connection structure of a pile head and a steel girder.

符号の説明Explanation of symbols

1…プレキャスト桁、11…孔、11a…上面、11b…下面、11c…内壁面、2A,2B,2C…管体、3…ジベル筋、4a,4b…リング状の棒鋼、5a,5b…螺旋状棒鋼、6…プレキャスト床版、7…鋼製井桁、71…鋼製桁、8…充填材、9…鋼管杭、10,10A,10B,10C…接続構造、100…構造体   DESCRIPTION OF SYMBOLS 1 ... Precast girder, 11 ... Hole, 11a ... Upper surface, 11b ... Lower surface, 11c ... Inner wall surface, 2A, 2B, 2C ... Tubular body, 3 ... Givel bar, 4a, 4b ... Ring-shaped steel bar, 5a, 5b ... Spiral Steel bar, 6 ... Precast slab, 7 ... Steel well girder, 71 ... Steel girder, 8 ... Filler, 9 ... Steel pipe pile, 10, 10A, 10B, 10C ... Connection structure, 100 ... Structure

Claims (6)

  1. 杭頭部とコンクリート製のプレキャスト桁との接続構造であって、
    前記プレキャスト桁のうち、杭頭部が接続される箇所には、該プレキャスト桁の一方面から、杭が挿入される側の他方面に向かって末広がり形状の孔が形成されており、該孔に杭頭部が遊嵌されるとともに充填材にてプレキャスト桁と杭頭部が接続されていることを特徴とする杭頭部とプレキャスト桁との接続構造。
    It is a connection structure between a pile head and a concrete precast girder,
    Of the precast girders, a hole having a diverging shape is formed from one surface of the precast girders toward the other surface on the side where the piles are inserted, at a place where the pile head is connected. A connection structure between a pile head and a precast girder, wherein the pile head is loosely fitted and the precast girder and the pile head are connected by a filler. Of the precast girders, a hole having a diverging shape is formed from one surface of the precast girders toward the other surface on the side where the piles are inserted, at a place where the pile head is connected. A connection structure between a pile head and a precast girder, wherein the pile head is loosely fitted and the precast girder and the pile head are connected by a filler.
  2. 請求項1に記載の杭頭部とプレキャスト桁との接続構造において、
    前記孔の内壁面には、該内壁面の形状に一致する外壁面形状を有する管体が取付けられており、該管体の外壁面には第1の凸部が形成されており、管体の内壁面には第2の凸部が形成されており、第1の凸部がプレキャスト桁の前記孔の内壁面に埋め込まれていることを特徴とする杭頭部とプレキャスト桁との接続構造。 A pipe body having an outer wall surface shape matching the shape of the inner wall surface is attached to the inner wall surface of the hole, and a first convex portion is formed on the outer wall surface of the pipe body. A second convex portion is formed on the inner wall surface of the precast girder, and the first convex portion is embedded in the inner wall surface of the hole of the precast girder. .. In the connection structure of the pile head according to claim 1 and the precast girder, In the connection structure of the pile head according to claim 1 and the precast girder,
    A tubular body having an outer wall surface shape that matches the shape of the inner wall surface is attached to the inner wall surface of the hole, and a first convex portion is formed on the outer wall surface of the tubular body. A connection structure between a pile head and a precast girder, characterized in that a second convex part is formed on the inner wall surface, and the first convex part is embedded in the inner wall surface of the hole of the precast girder . A tubular body having an outer wall surface shape that matches the shape of the inner wall surface is attached to the inner wall surface of the hole, and a first convex portion is formed on the outer wall surface of the tubular body. A connection structure between a pile head and a precast girder, characterized in that a second convex part is formed on the inner wall surface, and the first convex part is embedded in the inner wall surface of the hole of the precast girder.
  3. 前記凸部が、ジベル筋であることを特徴とする請求項2に記載の杭頭部とプレキャスト桁との接続構造。 The connection structure between a pile head and a precast girder according to claim 2, wherein the convex portion is a gibber line.
  4. 前記凸部が、管体の壁面にリング状または螺旋状に形成されていることを特徴とする請求項2に記載の杭頭部とプレキャスト桁との接続構造。   The connection structure between a pile head and a precast girder according to claim 2, wherein the convex portion is formed in a ring shape or a spiral shape on a wall surface of the tubular body.
  5. 前記孔に挿入された杭頭部の少なくとも外壁面に凸部が形成されていることを特徴とする請求項1〜4のいずれかに記載の杭頭部とプレキャスト桁との接続構造。 5. A connection structure between a pile head and a precast girder according to any one of claims 1 to 4, wherein a convex portion is formed on at least an outer wall surface of the pile head inserted into the hole.
  6. 杭頭部とプレキャスト桁との接続方法において、該プレキャスト桁のうち、杭頭部が接続される箇所には、プレキャスト桁の一方面から、杭が挿入される側の他方面に向かって末広がり形状の孔が形成されている、杭頭部とプレキャスト桁との接続方法であって、
    杭を対象地盤に設置する第1の工程と、プレキャスト桁を受けるための受材を杭頭部に設置する第2の工程と、杭頭部をプレキャスト桁の孔に遊嵌しながら該プレキャスト桁の下面を受材上に載置する第3の工程と、受材上の杭頭部に凸部を取付ける第4の工程と、前記孔の内部に充填材を充填する第5の工程と、からなることを特徴とする杭頭部とプレキャスト桁との接続方法。 The first step of installing the pile on the target ground, the second step of installing the receiving material for receiving the precast girder on the pile head, and the precast girder while loosely fitting the pile head into the hole of the precast girder. A third step of placing the lower surface of the material on the receiving material, a fourth step of attaching a convex portion to the pile head on the receiving material, and a fifth step of filling the inside of the hole with the filler. A method of connecting the pile head and the precast girder, which is characterized by consisting of.




    In the connection method between the pile head and the precast girder, the precast girder is connected to the pile head at the location where the pile head is connected from one side of the precast girder toward the other side where the pile is inserted. Is a method of connecting the pile head and the precast girder, In the connection method between the pile head and the precast girder, the precast girder is connected to the pile head at the location where the pile head is connected from one side of the precast girder toward the other side where the pile is inserted. Is a method of connecting the pile head and the precast girder,
    A first step of installing the pile on the target ground, a second step of installing a receiving material for receiving the precast girder on the pile head, and the precast girder while loosely fitting the pile head into the hole of the precast girder A third step of placing the lower surface of the pile on the receiving material, a fourth step of attaching a convex portion to the pile head on the receiving material, a fifth step of filling the inside of the hole with a filling material, A method of connecting a pile head and a precast girder characterized by comprising: A first step of installing the pile on the target ground, a second step of installing a receiving material for receiving the precast girder on the pile head, and the precast girder while loosely fitting the pile head into the hole of the precast girder A third step of placing the lower surface of the pile on the receiving material, a fourth step of attaching a convex portion to the pile head on the receiving material, a fifth step of filling the inside of the hole with a filling material, A method of connecting a pile head and a precast girder characterized by comprising:




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