JP2010090570A - Pile head joining structure - Google Patents

Pile head joining structure Download PDF

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JP2010090570A
JP2010090570A JP2008259902A JP2008259902A JP2010090570A JP 2010090570 A JP2010090570 A JP 2010090570A JP 2008259902 A JP2008259902 A JP 2008259902A JP 2008259902 A JP2008259902 A JP 2008259902A JP 2010090570 A JP2010090570 A JP 2010090570A
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reinforcing bar
fixing
steel pipe
pipe pile
screw
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JP5164778B2 (en
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Shunzo Yamamoto
俊三 山本
Shunsuke Yamamoto
俊輔 山本
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D B S Kk
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile head joining structure capable of shortening a working time and eliminating working man-hours by easily attaching a reinforcement to a steel pipe pile while stabilizing the fixed state, when the reinforcement is joined to the steel pipe pile. <P>SOLUTION: In this pile head joining structure in which the reinforcement is joined to the head of the steel pipe pile, a reinforcement locking part 3 is provided to the outer peripheral surface of the head of the steel pipe pile 1 at a plurality of positions, openings OP are formed by opening part of the reinforcement locking parts 3 in a slit shape in the axial direction of the steel pipe pile. Part of the reinforcement 2 is inserted into the openings OP. The reinforcement locking parts 3 are held with a fixing part 4 fixed while the end of the reinforcement 2 is brought into contact with a swelled part 21 and a tightening nut 5 screwed with the outer periphery of the reinforcement 2 to join the reinforcement 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、鋼管杭の頭部に鉄筋を接合する杭頭接合構造に関するものである。   The present invention relates to a pile head joint structure for joining a reinforcing bar to the head of a steel pipe pile.

従来は、鋼管杭の頭部外周に鉄筋を接合する杭頭接合構造として、鋼管杭の外周面上に鉄筋を直接溶接することが周知であった。このような接合構造による場合は、施工現場において、鉄筋を立設させた状態で溶接作業を行うものであるため、作業の困難性を伴うものであった。そこで、作業性を向上させるべく接合構造が開発されており、その主たる技術は、スリーブ状の支持部材を鋼管杭の表面に固着し、これに鉄筋を挿通しつつ固定するものであった。   Conventionally, it has been well known that the reinforcing bar is directly welded on the outer peripheral surface of the steel pipe pile as a pile head connecting structure in which the reinforcing bar is bonded to the outer periphery of the head part of the steel pipe pile. In the case of such a joining structure, since the welding work is performed in a state where the reinforcing bars are erected at the construction site, the work is difficult. Therefore, a joining structure has been developed in order to improve workability, and the main technique is to fix a sleeve-like support member to the surface of the steel pipe pile and to fix the steel pipe while inserting a reinforcing bar.

すなわち、鋼管杭の杭頭に鋼管（筒状部材）を溶接し、この鋼管（筒状部材）にネジ節鉄筋を挿通させた後、鋼管（筒状部材）から突出する両側にロックナットをはめて、この鋼管（筒状部材）に締め付ける構造があった（特許文献１）。   That is, a steel pipe (cylindrical member) is welded to the pile head of a steel pipe pile, threaded reinforcing bars are inserted through this steel pipe (cylindrical member), and then lock nuts are fitted on both sides protruding from the steel pipe (cylindrical member). In addition, there was a structure for fastening to this steel pipe (tubular member) (Patent Document 1).

また、鋼管杭の頭部外周に有底外套管を垂直に溶接固定し、この有底外套管に、ネジ孔を有する継手を抜き出し可能に挿入する構造のものがあった（特許文献２）。この技術は、有底外套管の内部に継手を固定したうえで、施工現場において上記継手のネジ孔にネジ節鉄筋の下端を螺合するものである。従って、有底外套管に装着する継手の寸法により接合可能な鉄筋の大きさが決定するものであるから、鋼管杭の頭部に異種サイズの継手が混入して取り付けられていても、これを有底外套管から取り出して所定サイズの継手と入れ替えるだけの操作で取り替えることができるものである。   Further, there is a structure in which a bottomed mantle tube is vertically fixed to the outer periphery of the head portion of the steel pipe pile and a joint having a screw hole is inserted into the bottomed mantle tube so as to be extractable (Patent Document 2). In this technique, the joint is fixed inside the bottomed outer tube, and the lower end of the screw rebar is screwed into the screw hole of the joint at the construction site. Therefore, since the size of the rebar that can be joined is determined by the size of the joint to be attached to the bottomed outer tube, even if a joint of different sizes is mixed and attached to the head of the steel pipe pile, It can be replaced by simply removing it from the bottomed outer tube and replacing it with a joint of a predetermined size.

さらに、杭の頭部の外周に溶接された雌ネジが形成されてなるネジ部材と、この雌ネジに螺合される中継ぎボルトが接合された異形鉄筋とで構成され、上記ネジ部材に中継ぎボルトを螺合することにより、この中継ぎボルトに接合される異形鉄筋が基礎コンクリート内部において杭を固定する杭頭構造があった（特許文献３）。この杭頭構造においては、中継ぎボルトに異形鉄筋を接合するため、異形鉄筋先端にカプラが一体的に接合され、かつ、当該カプラの先端から所定深さにわたって、中継ぎボルトが螺合できる雌ネジを形成する構成としていた。
特開平１１−２４７１８４号公報（２頁、図３） 特開平９−２５０１４３号公報（２頁、図１） 特開２００３−５５９６３号公報（２頁、図１） Furthermore, it is composed of a screw member in which a female screw welded to the outer periphery of the head of the pile is formed, and a deformed reinforcing bar to which a joint bolt to be screwed into the female screw is joined, and the joint bolt is connected to the screw member. There was a pile head structure in which the deformed reinforcing bars joined to the intermediate bolts fixed the pile inside the foundation concrete by screwing together (Patent Document 3). In this pile head structure, in order to join the deformed reinforcing bar to the intermediate bolt, a coupler is integrally joined to the tip of the deformed reinforcing bar, and a female screw that can be screwed into the intermediate bolt from the tip of the coupler over a predetermined depth is provided. It was set as the structure to form.
Japanese Patent Laid-Open No. 11-247184 (2 pages, FIG. 3) JP-A-9-250143 (2 pages, FIG. 1) JP 2003-55963 A (page 2, FIG. 1)

上記技術のうち、特許文献１の鉄筋取付構造においては、鋼管の上下両端にロックナットを締め付けるものであるが、鉄筋の軸線方向に沿った鉛直上向きの引張力に対しては、主として下端のロックナットで支えることとなり、ロックナットの締着力が鉄筋の引張力に対抗することになっていた。しかしながら、鋼管杭の杭頭に接続される鉄筋に対する外力は、鉛直上向きの方向に作用するものが最も大きく、そのため、下端のロックナットの締着力により鉄筋の固着力が左右されることから、当該鉄筋の固着の状態が均一ではなかった。   Among the above techniques, in the reinforcing bar mounting structure disclosed in Patent Document 1, lock nuts are fastened to the upper and lower ends of the steel pipe. However, the lock at the lower end is mainly applied to a vertically upward tensile force along the axial direction of the reinforcing bar. The nut was supported by the nut, and the fastening force of the lock nut was to counter the tensile force of the reinforcing bar. However, the external force applied to the rebar connected to the pile head of the steel pipe pile is the largest acting in the vertically upward direction, and therefore the fixing force of the rebar depends on the fastening force of the lock nut at the lower end. The state of the reinforcing bars was not uniform.

また、特許文献２の鉄筋接続具においては、ネジ節鉄筋を立設させた状態で、当該ネジ節鉄筋を回転させることにより、鉄筋接続具に螺合させる必要があり、作業工数の増大が予想されていた。同時に、ネジ節鉄筋の直径寸法毎に対応する継手を用意せざるを得ず、当該継手に要するコストの増大が懸念されていた。   Further, in the reinforcing bar connector of Patent Document 2, it is necessary to rotate the screw joint reinforcing bar in a state where the threaded reinforcing bar is erected, so that it is screwed into the reinforcing bar connector, and an increase in work man-hours is expected. It had been. At the same time, joints corresponding to the diameter dimensions of the threaded reinforcing bars had to be prepared, and there was concern about an increase in cost required for the joints.

さらに、特許文献３の杭頭構造においては、鋼管杭の外周に溶接されたネジ部材には、雌ネジが螺刻されており、異形鉄筋の先端には中継ぎボルトが接合されているため、鋼管杭に取り付けるためには、当該異形鉄筋自体を回転させる必要があり、この構造においても、作業工数の増大が予想されていた。また、中継ぎボルトと異形鉄筋を接合するためのカプラも必要となり、これらの部材に必要なコストの増大も考慮する必要があった。   Furthermore, in the pile head structure of patent document 3, since the internal thread is screwed in the screw member welded to the outer periphery of the steel pipe pile, and the joint bolt is joined to the front-end | tip of a deformed reinforcing bar, In order to attach to the pile, it is necessary to rotate the deformed reinforcing bar itself, and even in this structure, an increase in work man-hours was expected. In addition, a coupler for joining the intermediate bolt and the deformed reinforcing bar is required, and it is necessary to consider an increase in cost required for these members.

本発明は、上記諸点に鑑みてなされたものであって、その目的とするところは、鋼管杭の頭部に鉄筋を接合するに際して、鋼管杭への鉄筋の固着状態を安定させつつ、簡易に取り付ける構造とすることにより、作業時間の短縮および作業工数の省略を図ることにある。   The present invention has been made in view of the above-mentioned points. The purpose of the present invention is to easily fix the reinforcing state of the reinforcing bar to the steel pipe pile while joining the reinforcing bar to the head of the steel pipe pile. By adopting a mounting structure, the work time is shortened and the work man-hour is omitted.

そこで、本発明は、鋼管杭の頭部に鉄筋を接合する杭頭接合構造であって、上記鋼管杭の頭部外周面の複数個所に鉄筋係止部が設けられ、該鉄筋係止部の一部を上記鋼管杭の軸線方向に沿ったスリット状に開口してなる開口部が構成され、該開口部に上記鉄筋の一部を挿通させるとともに、上記鉄筋の先端を膨出させた膨出部に当接させつつ定着されている定着部と、該鉄筋の外周に螺挿されている締着ナットにより、上記鉄筋係止部を挟持することによって上記鉄筋を接合してなることを特徴とする杭頭接合構造を要旨とする。   Therefore, the present invention is a pile head joining structure for joining a reinforcing bar to the head of a steel pipe pile, and reinforcing bar locking portions are provided at a plurality of locations on the outer peripheral surface of the head of the steel pipe pile. An opening is formed by opening a part of the steel pipe pile in a slit shape along the axial direction of the steel pipe pile, and a part of the reinforcing bar is inserted into the opening and the tip of the reinforcing bar is bulged. The reinforcing bar is joined by holding the reinforcing bar engaging part between a fixing part fixed while contacting the part and a fastening nut screwed into the outer periphery of the reinforcing bar. The summary is the pile head joint structure.

上記構成によれば、鋼管杭の鉄筋係止部にスリット状の開口部を構成することにより、接合すべき鉄筋の先端に定着部が装着された状態のままで、開口部のスリットに鉄筋の軸線を合わせつつ挿通させることができることとなり、しかも締着ナットの締め付けにより鉄筋係止部を挟持させることから、鉄筋を接合させる場合に、鉄筋自体を回転させて取り付ける作業が不要となる。   According to the above configuration, by forming the slit-shaped opening in the reinforcing bar locking part of the steel pipe pile, the fixing part is attached to the tip of the reinforcing bar to be joined, and the reinforcing bar is inserted into the slit of the opening. Since it can be inserted while aligning the axis, and the reinforcing bar engaging portion is clamped by tightening the fastening nut, the work of rotating and attaching the reinforcing bar itself becomes unnecessary when the reinforcing bars are joined.

また、鉄筋の先端を膨出させた膨出部に当接させた定着部は、膨出部によって移動が制限されることとなるから、鉄筋または定着部のいずれかが破壊されない限りにおいて、鉄筋の引き抜きに対抗し得ることとなる。これは、鉄筋をロックナット等のように締着する六角ナットの場合に比較すれば、遥かに鉄筋を垂直に引き抜く外力に耐えることができ、鉄筋接合部分の強度を向上させることができる。   In addition, since the fixing portion that is in contact with the bulging portion where the tip of the reinforcing bar bulges is restricted from moving by the bulging portion, the reinforcing bar is not limited unless either the reinforcing bar or the fixing portion is broken. It will be possible to counter the pulling out. Compared to the case of a hexagon nut that fastens the reinforcing bar like a lock nut or the like, it can withstand the external force that pulls out the reinforcing bar much more vertically, and the strength of the reinforcing bar joint can be improved.

また、本発明は、鋼管杭の頭部外周面の複数個所に、該鋼管杭の軸線方向に沿ったスリット状の開口部を有する鉄筋係止部を設け、この鉄筋係止部の内部に鉄筋を配置しつつ該鉄筋を鋼管杭の頭部に接合する杭頭接合構造であって、上記鉄筋は、径方向に対向する二つの平面部が長手方向に連続して構成され、曲面部分にネジ節が形成され、かつ、先端に定着部を備えたネジ節定着鉄筋であり、上記鉄筋係止部は、上記スリット状の開口部の開口寸法を、上記ネジ節定着鉄筋の対向する平面部の厚み寸法においてのみ挿通可能に調整してなる鉄筋係止部であり、上記ネジ節定着鉄筋の定着部を上記鉄筋係止部よりも下方に位置させつつ、該ネジ節定着鉄筋の最も薄肉の部分を該鉄筋係止部の開口部から侵入させて、該ネジ節定着鉄筋を該鉄筋係止部の内部に配置し、上記鉄筋係止部の内部において上記ネジ節定着鉄筋を周方向に略９０度だけ回転させ、上記ネジ節定着鉄筋のネジ節に螺合する締着ナットを上記鉄筋係止部の上方から下向きに螺進させて、該鉄筋係止部を上記ネジ節定着鉄筋の定着部との間で挟着してなることを特徴とする杭頭接合構造をも要旨とする。   Further, the present invention provides a reinforcing bar locking portion having slit-like openings along the axial direction of the steel pipe pile at a plurality of locations on the outer peripheral surface of the head of the steel pipe pile, and the reinforcing bar is provided inside the reinforcing bar locking portion. A pile head joint structure in which the reinforcing bar is joined to the head of the steel pipe pile, and the reinforcing bar is composed of two flat portions that are opposed to each other in the radial direction and are continuously screwed on the curved surface portion. A screw node fixing reinforcing bar having a knot formed and having a fixing part at a tip thereof, wherein the reinforcing bar locking part has an opening dimension of the slit-like opening part of a plane part facing the screw node fixing reinforcing bar; Reinforcing bar locking part that is adjusted so that it can be inserted only in the thickness dimension, and the fixing part of the screw node fixing rebar is positioned below the reinforcing bar locking part, and the thinnest part of the screw node fixing bar Is inserted from the opening of the reinforcing bar locking portion, and the screw node fixing reinforcing bar is inserted into the reinforcing bar. A fastening nut that is disposed inside the stop portion, rotates the screw joint fixing rebar by approximately 90 degrees in the circumferential direction inside the reinforcing bar locking portion, and is screwed into the screw joint of the screw joint fixing reinforcing bar, and The gist of the present invention is also a pile head joint structure characterized by being screwed downward from above the locking portion and sandwiching the reinforcing bar locking portion between the fixing portion of the screw node fixing reinforcing bar. .

上記構成によれば、接合すべき鉄筋がネジ節鉄筋であるとともに、鉄筋係止部に構成されるスリット状の開口部の開口寸法を鉄筋の薄肉部分においてのみ挿通できるように構成していることから、鉄筋を所定の向き、すなわち、対向する平面部がスリット状の開口部の開口端縁に接する向きに合わせることで、当該鉄筋の軸線方向を開口部のスリット方向と平行にした状態で当該開口部に挿通できることとなる。その結果、定着部が装着された状態においても、鉄筋を鉄筋係止部の内部に配置させることができる。さらに、鉄筋係止部の内部において鉄筋を周方向に回転させることにより、このように回転した鉄筋がスリット状の開口部に当接したとしても、対向する平面部がスリット状の開口部の開口端縁に接することがないことから、当該鉄筋がスリット状の開口部を挿通して外方に出ることを防止できるのである。   According to the above configuration, the reinforcing bars to be joined are screw joint reinforcing bars, and the opening size of the slit-shaped opening formed in the reinforcing bar locking portion can be inserted only in the thin portion of the reinforcing bar. From the above, the rebar is aligned in a predetermined direction, that is, the direction in which the opposing flat portions are in contact with the opening edge of the slit-shaped opening, so that the axial direction of the rebar is parallel to the slit direction of the opening. It can be inserted through the opening. As a result, the reinforcing bars can be arranged inside the reinforcing bar locking portion even when the fixing portion is mounted. Further, by rotating the reinforcing bar in the circumferential direction inside the reinforcing bar locking part, even if the rotated reinforcing bar comes into contact with the slit-shaped opening, the opposing flat part is the opening of the slit-shaped opening. Since it does not contact the edge, the reinforcing bar can be prevented from passing through the slit-shaped opening and going outward.

上記各発明において、上記鉄筋係止部は、一対の板状の係止部構成部材により構成され、この係止部構成部材を鋼管杭表面に突設するとともに、先端に向かって徐々に間隔を縮小させてなるハ字形に配設させることによりスリット状の開口部を構成している鉄筋係止部とすることもできる。   In each of the above inventions, the reinforcing bar locking portion is constituted by a pair of plate-shaped locking portion constituent members, and the locking portion constituent members project from the surface of the steel pipe pile, and are gradually spaced toward the tip. It can also be set as the reinforcing bar latching | locking part which comprises the slit-shaped opening part by arrange | positioning in the reduced C-shape.

上記構成によれば、スリット状の開口部は、係止部構成部材の先端に形成される間隔によって構成されることとなり、接合すべき鉄筋の大きさ（対向する平面部の厚さ寸法）に対応する開口幅を容易に得ることができる。また、鉄筋係止部は、上記スリット状の開口部のほかに、鉄筋係止部の上方および下方も開口された状態であるから、鉄筋を鉄筋係止部に接合させた後に、コンクリートを打設した場合、鉄筋係止部の各開口部分から当該鉄筋係止部の内部にもコンクリートが流入するため、鉄筋係止部と鉄筋との接合を補助するグラウト剤等の接合補助剤が不要となる。   According to the said structure, a slit-shaped opening part will be comprised by the space | interval formed in the front-end | tip of a latching | locking part structural member, and is the magnitude | size (thickness dimension of the opposing plane part) which should be joined. The corresponding opening width can be easily obtained. In addition to the slit-shaped opening, the reinforcing bar locking part is also open above and below the reinforcing bar locking part. After joining the reinforcing bar to the reinforcing bar locking part, the concrete is struck. When installed, the concrete flows into the inside of the reinforcing bar locking part from each opening part of the reinforcing bar locking part, so there is no need for a bonding aid such as a grout agent to assist the bonding between the reinforcing bar locking part and the reinforcing bar. Become.

本発明によれば、定着部を有する鉄筋を使用するため、鉄筋本体に作用する軸線方向に沿った鉛直上向きの外力に対して十分な強度を有することとなる。これと同時に、鉄筋係止部の開口部のスリットに合わせて鉄筋を挿通することができるため、鉄筋の先端から鉄筋係止部に挿入する場合と異なり、作業時間の短縮および作業工数の省略を図ることができる。   According to the present invention, since the reinforcing bar having the fixing portion is used, the reinforcing bar has a sufficient strength against an upward external force along the axial direction acting on the reinforcing bar main body. At the same time, since the rebar can be inserted through the slit of the opening of the reinforcing bar locking part, unlike the case where it is inserted into the reinforcing bar locking part from the end of the reinforcing bar, the work time is shortened and the number of work steps is omitted. Can be planned.

また、鉄筋に取り付けられた先端の定着部と締着ナットによって鉄筋係止部を上下方向から挟持することにより、鉄筋を鋼管杭の外周面に立設させることができる。このとき、締着ナットの端面を大きくするか、または、所定の表面積を有する座金を介在させることにより、鉄筋係止部の上部端面に適宜面積の密着部分を構成することができる。また、定着部の表面を鉄筋係止部の下部端面に適宜面積で密着させることができる。これらにより、鋼管杭の外周面に立設される鉄筋の姿勢を安定させることとなる。   Further, the reinforcing bar can be erected on the outer peripheral surface of the steel pipe pile by sandwiching the reinforcing bar locking part from above and below by the fixing part at the tip attached to the reinforcing bar and the fastening nut. At this time, a close contact portion having an appropriate area can be formed on the upper end surface of the reinforcing bar locking portion by enlarging the end surface of the fastening nut or by interposing a washer having a predetermined surface area. In addition, the surface of the fixing unit can be brought into close contact with the lower end surface of the reinforcing bar locking unit in an appropriate area. By these, the attitude | position of the reinforcement erected on the outer peripheral surface of a steel pipe pile will be stabilized.

以下、本発明の実施の形態を図面に基づいて説明する。第一の実施形態は、図
１に示すように、鋼管杭１の外周面に鉄筋２を立設する構成であり、鉄筋係止部３を介して両者を接合するものである。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the first embodiment is a configuration in which a reinforcing bar 2 is erected on the outer peripheral surface of a steel pipe pile 1, and both are joined via a reinforcing bar locking portion 3.

鋼管杭１は、円筒状に形成されたコンクリートの外周に鋼管が巻かれている杭である。この鋼管杭１の大部分が地中に打設されて、杭頭の一部が地表に表出するようになっている。地表に表出している鋼管杭１の頭部外周面には、鉄筋２を係止させるための鉄筋係止部３が複数個所に設けられている。   The steel pipe pile 1 is a pile in which a steel pipe is wound around the outer periphery of a concrete formed in a cylindrical shape. Most of the steel pipe pile 1 is driven into the ground, and a part of the pile head is exposed on the ground surface. Reinforcing bar locking portions 3 for locking the reinforcing bars 2 are provided at a plurality of locations on the outer peripheral surface of the head portion of the steel pipe pile 1 exposed on the ground surface.

鉄筋２は、図２に示すように、外周面にネジ状の凹凸部が設けられたネジ節鉄筋が使用される。この鉄筋２の先端付近において、定着部４が膨出部２１によって、または、膨出部２１および***部２２によって、装着されたいわゆる定着鉄筋が使用されている。定着部４は、円板状に形成されて、中央には貫通孔４１が設けられており、この貫通孔４１に鉄筋２が挿通されて鍔状に定着部４が装着される。定着部４の装着には、膨出部２１が定着部４の貫通孔４１の内部でも膨張して固定するもの（図２（ａ））のほかに、定着部４の鉄筋先端側に膨出部２１を構成し、他端側に***部２２を構成するもの（図２（ｂ））がある。この構成では、膨出部２１は、定着部４の引き抜きを防止するためのものであり、***部２２は、定着部４の設置状態を維持するためのものである。   As the rebar 2, as shown in FIG. 2, a screw node rebar having a screw-shaped uneven portion on the outer peripheral surface is used. In the vicinity of the tip of the reinforcing bar 2, a so-called fixing reinforcing bar is used in which the fixing part 4 is mounted by the bulging part 21, or by the bulging part 21 and the protruding part 22. The fixing unit 4 is formed in a disk shape, and a through hole 41 is provided in the center. The reinforcing bar 4 is attached in a hook shape by inserting the reinforcing bar 2 into the through hole 41. When the fixing unit 4 is mounted, the bulging part 21 swells to the front end side of the reinforcing bar of the fixing part 4 in addition to the bulging part 21 that also expands and is fixed inside the through hole 41 of the fixing part 4 (FIG. 2A). There is what constitutes the portion 21 and constitutes the raised portion 22 on the other end side (FIG. 2B). In this configuration, the bulging portion 21 is for preventing the fixing portion 4 from being pulled out, and the raised portion 22 is for maintaining the installation state of the fixing portion 4.

上記定着鉄筋における膨出部２１は、鉄筋２の先端を軸線方向に加圧させることにより形成させることができ、定着部４の貫通孔４１の内径よりも大きくなるように周方向に膨出させるのである。また、膨出部２１の反対側に***部２２を設ける構成では、***部２２と膨出部２１の中間に定着部４が配設される構成となっている。上記のように、貫通孔４１の孔径よりも膨出部２１および***部２２の外径を大きくすることで、鉄筋２に挿通された定着部４を引き抜くことができないのである。   The bulging portion 21 in the fixing reinforcing bar can be formed by pressurizing the tip of the reinforcing bar 2 in the axial direction, and bulges in the circumferential direction so as to be larger than the inner diameter of the through hole 41 of the fixing portion 4. It is. In the configuration in which the raised portion 22 is provided on the opposite side of the bulging portion 21, the fixing portion 4 is disposed between the raised portion 22 and the bulging portion 21. As described above, by making the outer diameters of the bulging portion 21 and the raised portion 22 larger than the hole diameter of the through hole 41, the fixing portion 4 inserted through the reinforcing bar 2 cannot be pulled out.

このように、本実施形態では、ネジ節定着鉄筋（ネジ節鉄筋の先端に定着部を構成したもの）を使用するものであるが、ネジ節鉄筋の場合には、鉄筋２の外周面の一部は、軸方向において互いに平行となるような平面部２３，２４を有している（図１および図３参照）。これは、ネジ状の凹凸（特に、凸状のネジ山部分）が連続しないように構成したものであるが、このため、鉄筋２の径方向の寸法は、二方向において異なる構成となっている。すなわち、ネジ状の凹凸が存在する部分では対向する弧状面の直径Ｄと、対向する平面部２３，２４の厚さ寸法である短幅Ｈの幅とに区分されるのである。   As described above, in the present embodiment, the screw node fixing rebar (the fixing member is formed at the tip of the screw node reinforcing bar) is used. In the case of the screw node reinforcing bar, one of the outer peripheral surfaces of the reinforcing bar 2 is used. The portion has flat portions 23 and 24 that are parallel to each other in the axial direction (see FIGS. 1 and 3). This is configured such that screw-shaped irregularities (particularly, convex thread portions) do not continue, and therefore, the radial dimensions of the reinforcing bar 2 are different in the two directions. . That is, in the part where the screw-shaped unevenness exists, the diameter D of the opposing arcuate surface is divided into the width of the short width H which is the thickness dimension of the opposing flat surface portions 23 and 24.

鉄筋係止部３は、図３に示すように、鋼管杭１の頭部外周面上に配設された一対の係止部構成部材３１，３２により構成されるものである。この係止部構成部材３１，３２は、長方形の板状に形成されて平面部分が対向するように配設されており、長手方向を鋼管杭１の軸線方向に向けて配置されている。係止部構成部材３１，３２における長方形の長辺に相当する一の端面は、鋼管杭１の頭部外周面上に溶接され、他方の端面は、相互に対向しつつ所定の間隔を有しており、この間隔によりスリット状の開口部ＯＰが構成されるようになっている。そして、この開口部ＯＰに構成される間隔は、溶接側端面よりも狭くなるように配置されており、その結果として、この係止部構成部材３１，３２の上部端面がハ字形となっている。   As shown in FIG. 3, the reinforcing bar locking portion 3 is constituted by a pair of locking portion constituting members 31 and 32 disposed on the outer peripheral surface of the head of the steel pipe pile 1. The engaging portion constituting members 31 and 32 are formed in a rectangular plate shape and are disposed so that the plane portions thereof are opposed to each other, and are disposed with the longitudinal direction thereof directed toward the axial direction of the steel pipe pile 1. One end surface corresponding to the long side of the rectangular shape in the locking member 31 and 32 is welded to the outer peripheral surface of the head portion of the steel pipe pile 1, and the other end surface has a predetermined interval while facing each other. A slit-like opening OP is formed by this interval. And the space | interval comprised by this opening part OP is arrange | positioned so that it may become narrower than a welding side end surface, As a result, the upper end surface of this latching | locking part structural member 31 and 32 becomes a C shape. .

次に、鉄筋２と鉄筋係止部３との接合方法について説明する。上記のように、本実施形態の鉄筋係止部３は、鋼管杭１の外周面上に配設され、係止部構成部材３１，３２は上部端面がハ字形となるように溶接されており、先端においてスリット状の開口部ＯＰが設けられる構成となっている。   Next, a method for joining the reinforcing bar 2 and the reinforcing bar locking portion 3 will be described. As described above, the reinforcing bar locking portion 3 of the present embodiment is disposed on the outer peripheral surface of the steel pipe pile 1, and the locking portion constituting members 31 and 32 are welded so that the upper end surface has a C shape. The slit-shaped opening OP is provided at the tip.

そこで、図３に示すように、スリット状の開口部ＯＰの幅は、鉄筋２の短幅Ｈよりも広く、かつ、直径Ｄよりは狭い幅となるように係止部構成部材３１，３２の突出角度を調整することにより、鉄筋２の短幅Ｈにおいてのみ当該開口部ＯＰを挿通できるように構成し得るのである（図３（ａ）および（ｂ）参照）。そして、このように鉄筋係止部３を構成することによって、上記開口部ＯＰの開口間隔に鉄筋２の短幅Ｈから挿通させ、この鉄筋２を係止部構成部材３１，３２の中間に配置させたところで、周方向に正負いずれかに約９０度回転させる（図３（ｃ）参照）ことによって、鉄筋２は再びスリット状の開口部ＯＰを通過して鉄筋係止部３の外方に出ることができないこととなるのである。すなわち、鉄筋２を周方向に回転させることにより、スリット状の開口部ＯＰに対して短幅Ｈではなく直径Ｄが対向する状態となり、この直径Ｄの幅は、短幅Ｈよりも大きく、従って、開口部ＯＰの開口間隔よりも広いことから、開口部ＯＰを鉄筋２が通過することはないのである（図３（ｄ）参照）。   Therefore, as shown in FIG. 3, the width of the slit-shaped opening OP is larger than the short width H of the reinforcing bar 2 and narrower than the diameter D, so that the locking portion constituting members 31 and 32 are narrower. By adjusting the protrusion angle, the opening OP can be inserted only in the short width H of the reinforcing bar 2 (see FIGS. 3A and 3B). Then, by configuring the reinforcing bar locking portion 3 in this way, the opening interval of the opening OP is inserted from the short width H of the reinforcing bar 2, and the reinforcing bar 2 is disposed between the locking portion constituting members 31 and 32. Then, by rotating about 90 degrees in either the positive or negative direction in the circumferential direction (see FIG. 3C), the rebar 2 passes through the slit-like opening OP again to the outside of the rebar locking portion 3. It will not be possible to leave. That is, by rotating the reinforcing bar 2 in the circumferential direction, the slit-shaped opening OP has a diameter D opposed to the short width H, and the width of the diameter D is larger than the short width H. Since the opening interval is wider than the opening OP, the reinforcing bar 2 does not pass through the opening OP (see FIG. 3D).

このように、鉄筋係止部３の内部に鉄筋２を配置した状態において、図４に示すように、挿入された鉄筋２の先端に設けられている定着部４の上部平面部分を係止部構成部材３１，３２の下部端面に当接させ、鉄筋係止部３の上方において鉄筋２に螺挿させた締着ナット（六角ナット）５を係止部構成部材３１，３２の上部端面に向かって螺進させることにより、当該六角ナット５の端面を係止部構成部材３１，３２の上部端面に当接させつつ締着させることができる。この締着により、上記定着部４と当該六角ナット５により係止部構成部材３１，３２を挟持させることができることとなる。   In this manner, in the state where the reinforcing bar 2 is arranged inside the reinforcing bar locking part 3, as shown in FIG. 4, the upper flat portion of the fixing part 4 provided at the tip of the inserted reinforcing bar 2 is locked to the locking part. A fastening nut (hexagonal nut) 5 which is brought into contact with the lower end surfaces of the constituent members 31 and 32 and screwed into the reinforcing bar 2 above the reinforcing bar engaging portions 3 is directed toward the upper end surfaces of the engaging portion constituent members 31 and 32. Thus, the end face of the hexagon nut 5 can be fastened while being brought into contact with the upper end faces of the locking portion constituting members 31 and 32. By this fastening, the fixing portion 4 and the hexagon nut 5 can hold the locking portion constituting members 31 and 32.

このとき、六角ナット５の下方には、係止部構成部材３１，３２の上面に適宜面積で当接するワッシャ６を配置する形態とすることができる。すなわち鉄筋係止部３と六角ナット５との中間にワッシャ６を配置するのである。このような形態の場合には、ワッシャ６の表面が係止部構成部材３１，３２の上部端面に相当程度の面積で当接するから、六角ナット５による締着力が係止部構成部材３１，３２の上部端面に対してワッシャ６を密着させ、当該ワッシャ６の平面が係止部構成部材３１，３２の上部端面に平行となるため、鉄筋２の軸線をワッシャ６の平面に対して垂直方向に維持させることができるのである。これにより、鉄筋２は、鋼管杭１の表面において軸線を鉛直方向に向けつつ鉄筋係止部３に接合されることとなるのである。   At this time, a washer 6 can be disposed below the hexagon nut 5 so as to abut on the upper surfaces of the engaging portion constituting members 31 and 32 in an appropriate area. That is, the washer 6 is arranged between the reinforcing bar locking portion 3 and the hexagon nut 5. In the case of such a configuration, the surface of the washer 6 abuts on the upper end surfaces of the locking portion constituting members 31 and 32 in a considerable area, so that the fastening force by the hexagon nut 5 is applied to the locking portion constituting members 31 and 32. The washer 6 is brought into close contact with the upper end surface of the steel plate, and the flat surface of the washer 6 is parallel to the upper end surface of the locking member constituting members 31 and 32, so that the axis of the rebar 2 is perpendicular to the flat surface of the washer 6. It can be maintained. Thereby, the reinforcing bar 2 is joined to the reinforcing bar locking part 3 with the axis line oriented in the vertical direction on the surface of the steel pipe pile 1.

次に、第二の実施形態について説明する。本実施形態は、図５に示すように、鉄筋係止部における係止部構成部材１３１は、断面Ｃ字形の略円筒状に形成されており、長尺方向にはスリット状の開口部ＯＰ２が形成されているものである。   Next, a second embodiment will be described. In the present embodiment, as shown in FIG. 5, the locking member constituting member 131 in the reinforcing bar locking portion is formed in a substantially cylindrical shape having a C-shaped cross section, and a slit-like opening OP <b> 2 is formed in the longitudinal direction. Is formed.

この開口部ＯＰ２は、第一の実施形態と同様に、ネジ節鉄筋の対向する平面部２３，２４の厚み寸法においてのみ挿通可能な開口寸法で構成され、鉄筋２を短幅Ｈ方向から挿通させることにより、鉄筋係止部の内部に配置できるようになっている。   As in the first embodiment, the opening OP2 is configured with an opening dimension that can be inserted only in the thickness dimension of the planar portions 23 and 24 of the screw joint reinforcing bar, and allows the reinforcing bar 2 to be inserted from the short width H direction. Therefore, it can arrange | position inside a reinforcing bar latching | locking part.

そして、鉄筋２を係止部構成部材１３１内部に配置させた後、鉄筋２を周方向に（約９０度が適当であるが鉄筋の平面部２３，２４の位置が変化する程度に）回転させ、定着部４および六角ナット５により係止部構成部材１３１を挟持させることにより、鉄筋２を鋼管杭１に接合させることができるのである。この場合であっても、第一の実施形態と同様の効果を得ることができる。   And after arrange | positioning the reinforcing bar 2 in the latching | locking part structural member 131, the reinforcing bar 2 is rotated to the circumferential direction (about 90 degree is appropriate, but the position of the plane parts 23 and 24 of a reinforcing bar changes). The rebar 2 can be joined to the steel pipe pile 1 by sandwiching the engaging portion constituting member 131 by the fixing portion 4 and the hexagon nut 5. Even in this case, the same effect as the first embodiment can be obtained.

本実施形態においては、係止部構成部材１３１が断面Ｃ字形であるため、内部表面が弧状に形成されている。従って、この弧状面をネジ節鉄筋２のネジ部（平面部２３，２４を除く凹凸が形成される部分）の外径寸法に合わせることにより、鉄筋係止部の内部に配置された鉄筋２は、多少の遊びを有するものの略円筒状の鉄筋係止部の軸線方向に鉄筋２の軸線を合致させつつ配置されることとなる。これにより、定着部４と六角ナット５による挟持は、鉄筋２が上下方向に移動しない程度でよく、鉄筋２が立設されたときの姿勢を維持させる程度の挟持は不要となる。   In this embodiment, since the latching | locking part structural member 131 is C-shaped in cross section, the internal surface is formed in arc shape. Therefore, by matching this arcuate surface with the outer diameter of the threaded portion of the threaded reinforcing bar 2 (the portion where the irregularities except for the flat portions 23 and 24 are formed), the reinforcing bar 2 arranged inside the reinforcing bar locking portion is Although it has some play, it will be arrange | positioned, making the axis line of the reinforcing bar 2 correspond to the axial direction of the substantially cylindrical reinforcing bar locking part. Thereby, the clamping by the fixing part 4 and the hexagon nut 5 may be performed so that the rebar 2 does not move in the vertical direction, and it is not necessary to perform clamping so as to maintain the posture when the rebar 2 is erected.

本発明の実施形態は上記のとおりであるが、本発明の趣旨を逸脱しない範囲において種々の態様をとることができる。例えば、定着部４を鉄筋２に装着させる構造について、鉄筋２の先端に膨出部２１を構成する際に、定着部４を装着すべき位置の鉄筋が同時に膨出し、貫通孔４１の表面に到達することによって、定着部４を圧着するものである。この定着部４の圧着は、極端に強固である必要はなく、定着部４の設置状態が維持される程度であればよい。   The embodiment of the present invention is as described above, but various modes can be taken without departing from the spirit of the present invention. For example, in the structure in which the fixing unit 4 is attached to the reinforcing bar 2, when the bulging portion 21 is formed at the tip of the reinforcing bar 2, the reinforcing bar at the position where the fixing unit 4 is to be attached bulges at the same time. By reaching, the fixing portion 4 is pressure-bonded. The pressure bonding of the fixing unit 4 does not need to be extremely strong, and may be performed as long as the installation state of the fixing unit 4 is maintained.

また、鉄筋２について本実施形態では、ネジ節鉄筋を使用しているが、汎用の異形鉄筋を使用することも可能である。この場合は、六角ナットで締着させる範囲において、この異形鉄筋の外周に雄ネジを螺刻することが必要となる。   Further, in the present embodiment, the threaded reinforcing bar is used for the reinforcing bar 2, but a general-purpose deformed reinforcing bar can also be used. In this case, it is necessary to screw a male screw around the outer periphery of the deformed reinforcing bar within a range where the hexagon nut is fastened.

本発明の実施形態を示す斜視図である。It is a perspective view which shows embodiment of this invention. 鉄筋に定着部を挿入した詳細図である。It is the detail which inserted the fixing | fixed part in the reinforcing bar. 鉄筋を鉄筋係止部に挿入する際の説明図である。It is explanatory drawing at the time of inserting a reinforcing bar in a reinforcing bar latching | locking part. 本発明の実施形態を示すＩＶ−ＩＶ断面図である。It is IV-IV sectional drawing which shows embodiment of this invention. 本発明の他の実施形態を示す斜視図である。It is a perspective view which shows other embodiment of this invention.

符号の説明Explanation of symbols

１ 鋼管杭
２ 鉄筋
３ 鉄筋係止部
４ 定着部
５ 六角ナット（締着ナット）
６ ワッシャ
２１ 膨出部
２２ ***部
２３，２４ 平面部
３１，３２ 係止部構成部材
４１ 貫通孔 1 Steel pipe pile 2 Reinforcing bar 3 Reinforcing bar locking part 4 Fixing part 5 Hexagon nut (fastening nut)
6 washer 21 bulging portion 22 raised portions 23 and 24 flat surface portions 31 and 32 engaging portion constituting member 41 through hole

Claims (4)

鋼管杭の頭部に鉄筋を接合する杭頭接合構造であって、上記鋼管杭の頭部外周面の複数個所に鉄筋係止部が設けられ、該鉄筋係止部の一部を上記鋼管杭の軸線方向に沿ったスリット状に開口してなる開口部が構成され、該開口部に上記鉄筋の一部を挿通させるとともに、上記鉄筋の先端を膨出させた膨出部に当接させつつ定着されている定着部と、該鉄筋の外周に螺挿されている締着ナットにより、上記鉄筋係止部を挟持することによって上記鉄筋を接合してなることを特徴とする杭頭接合構造。 A pile head joint structure for joining a reinforcing bar to the head of a steel pipe pile, wherein reinforcing bar locking portions are provided at a plurality of locations on the outer peripheral surface of the head of the steel pipe pile, and a part of the reinforcing bar locking portion is connected to the steel pipe pile. An opening formed in a slit shape along the axial direction is configured, and a part of the reinforcing bar is inserted into the opening and the tip of the reinforcing bar is brought into contact with the bulging part A pile head joining structure, wherein the reinforcing bars are joined by sandwiching the reinforcing bar engaging part by a fixing part that is fixed and a fastening nut that is screwed into the outer periphery of the reinforcing bars. 鋼管杭の頭部外周面の複数個所に、該鋼管杭の軸線方向に沿ったスリット状の開口部を有する鉄筋係止部を設け、この鉄筋係止部の内部に鉄筋を配置しつつ該鉄筋を鋼管杭の頭部に接合する杭頭接合構造であって、上記鉄筋は、径方向に対向する二つの平面部が長手方向に連続して構成され、曲面部分にネジ節が形成され、かつ、先端に定着部を備えたネジ節定着鉄筋であり、上記鉄筋係止部は、上記スリット状の開口部の開口寸法を、上記ネジ節定着鉄筋の対向する平面部の厚み寸法においてのみ挿通可能に調整してなる鉄筋係止部であり、上記ネジ節定着鉄筋の定着部を上記鉄筋係止部よりも下方に位置させつつ、該ネジ節定着鉄筋の最も薄肉の部分を該鉄筋係止部の開口部から侵入させて、該ネジ節定着鉄筋を該鉄筋係止部の内部に配置し、上記鉄筋係止部の内部において上記ネジ節定着鉄筋を周方向に略９０度だけ回転させ、上記ネジ節定着鉄筋のネジ節に螺合する締着ナットを上記鉄筋係止部の上方から下向きに螺進させて、該鉄筋係止部を上記ネジ節定着鉄筋の定着部との間で挟着してなることを特徴とする杭頭接合構造。 Reinforcing bar locking portions having slit-like openings along the axial direction of the steel pipe pile are provided at a plurality of locations on the outer peripheral surface of the head portion of the steel pipe pile, and the reinforcing bars are arranged while the reinforcing bars are arranged inside the reinforcing bar locking portion. A pile head joint structure for joining a steel pipe pile head, wherein the reinforcing bar has two planar portions that are radially opposed to each other in a continuous manner in the longitudinal direction, and a screw node is formed on the curved surface portion, and , A screw node fixing rebar provided with a fixing part at the tip, and the reinforcing bar locking part can be inserted through the opening dimension of the slit-shaped opening only in the thickness dimension of the flat part facing the screw node fixing bar A fixing portion of the screw joint fixing rebar, and the fixing portion of the screw joint fixing rebar is positioned below the reinforcing member locking portion, and the thinnest portion of the screw joint fixing rebar is the reinforcing member locking portion. The screw joint fixing rebar is placed inside the rebar locking part. Then, inside the reinforcing bar locking portion, the screw node fixing reinforcing bar is rotated by approximately 90 degrees in the circumferential direction, and a fastening nut that is screwed into the screw node of the screw node fixing reinforcing bar is inserted from above the reinforcing bar locking portion. A pile head joint structure characterized by being screwed downward and sandwiching the reinforcing bar engaging part with the fixing part of the screw node fixing reinforcing bar. 前記鉄筋は、軸方向に平行する二つの平面部を有するネジ節鉄筋である請求項１記載の杭頭接合構造。 The pile head joint structure according to claim 1, wherein the reinforcing bar is a screw joint reinforcing bar having two flat portions parallel to the axial direction. 前記鉄筋係止部は、一対の板状の係止部構成部材により構成され、該係止部構成部材を前記鋼管杭表面に突設するとともに、先端に向かって徐々に間隔を縮小させてなるハ字形に配設させることによりスリット状の開口部を形成してなる鉄筋係止部である請求項１ないし３のいずれかに記載の杭頭接合構造。 The reinforcing bar locking portion is constituted by a pair of plate-shaped locking portion constituting members, and the locking portion constituting member protrudes from the surface of the steel pipe pile, and the interval is gradually reduced toward the tip. The pile head joint structure according to any one of claims 1 to 3, wherein the pile head joint structure is a reinforcing bar locking portion formed by forming a slit-like opening by being arranged in a C shape.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015034458A (en) * 2013-07-09 2015-02-19 日立機材株式会社 Pile head joint structure
JP2016089539A (en) * 2014-11-07 2016-05-23 岡部株式会社 Pile-head joint structure for steel pipe-reinforced concrete pile
JP2017025695A (en) * 2015-07-16 2017-02-02 システム計測株式会社 Pile head joint structure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11247184A (en) * 1998-03-04 1999-09-14 Tokyo Tekko Co Ltd Execution of pile head anchor bar of steel pipe pile
JP2003094180A (en) * 2001-09-20 2003-04-02 Nippon Steel Corp Treatment method for pile head of steel pipe pile

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11247184A (en) * 1998-03-04 1999-09-14 Tokyo Tekko Co Ltd Execution of pile head anchor bar of steel pipe pile
JP2003094180A (en) * 2001-09-20 2003-04-02 Nippon Steel Corp Treatment method for pile head of steel pipe pile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015034458A (en) * 2013-07-09 2015-02-19 日立機材株式会社 Pile head joint structure
JP2016089539A (en) * 2014-11-07 2016-05-23 岡部株式会社 Pile-head joint structure for steel pipe-reinforced concrete pile
JP2017025695A (en) * 2015-07-16 2017-02-02 システム計測株式会社 Pile head joint structure

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