JP2012154122A - Pile manufacturing method, pile construction method, and member for positioning and fixing reinforcement group - Google Patents

Pile manufacturing method, pile construction method, and member for positioning and fixing reinforcement group Download PDF

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JP2012154122A
JP2012154122A JP2011015482A JP2011015482A JP2012154122A JP 2012154122 A JP2012154122 A JP 2012154122A JP 2011015482 A JP2011015482 A JP 2011015482A JP 2011015482 A JP2011015482 A JP 2011015482A JP 2012154122 A JP2012154122 A JP 2012154122A
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fixing
pile
reinforcing bar
support
core
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JP5640768B2 (en
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Katsuhisa Nishimura
勝尚 西村
Yoshitaka Matsumura
美孝 松村
Yoshiyuki Fukumoto
義之 福本
Tatsuo Mitsui
達雄 三井
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Ohbayashi Corp
株式会社大林組
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Abstract

PROBLEM TO BE SOLVED: To arrange reinforcement inside a pile such as core reinforcement or inner peripheral reinforcement of double reinforcement to excellently position the same with excellent workability.SOLUTION: The present invention relates to a manufacturing method of a pile 10 with a core reinforcement group 42 having a plurality of core reinforcement 40 embedded therein. The core reinforcement group 42 is positioned inside the pile 10 and is fixed thereto by: providing a member support section 60 at an outer peripheral section of the pile 10; and using a positioning and fixing member 50 constructed by integrating a core reinforcement group fixing section 52 with the core reinforcement group 42 fixed thereto and a support/fixing section 54 which is provided at the outer peripheral side of the core reinforcement group fixing section 52 and is supported by and fixed to the member support section 60.

Description

本発明は、杭の構築方法、杭の施工方法、及び杭の構築の際に用いる鉄筋群の位置決め固定用の部材に関する。   The present invention relates to a pile construction method, a pile construction method, and a member for positioning and fixing a reinforcing bar group used in the construction of a pile.

基礎と接合される鉄筋コンクリート杭の頭部の構造として、鉄筋籠の内周側に複数の芯鉄筋からなる芯鉄筋群を埋設したものが知られている(例えば、特許文献1参照)。この杭頭部の構造では、鉄筋籠の内周側に埋設される鋼管の内周面に芯鉄筋群を接合し、鉄筋籠に予め溶接された組み付け材に鋼管を結束鉄線にて固定している。   As a head structure of a reinforced concrete pile to be joined to a foundation, a structure in which a core reinforcing bar group composed of a plurality of core reinforcing bars is embedded on the inner peripheral side of a reinforcing bar rod is known (see, for example, Patent Document 1). In this pile head structure, the core rebar group is joined to the inner peripheral surface of the steel pipe embedded on the inner peripheral side of the reinforcing bar, and the steel pipe is fixed to the assembly material pre-welded to the reinforcing bar with a bundled iron wire. Yes.

特開2005―82995号公報Japanese Patent Laid-Open No. 2005-8295

特許文献1に記載の杭頭部の構造では、芯鉄筋群の位置決め作業を要するところ、上記組み付け材の構成が具体化されておらず、どのようにして鋼管を鉄筋籠に固定し、どのようにして芯鉄筋群を位置決めするのか具体化されていない。また、この杭頭部の構造では、杭径が大きくなるほど、鉄筋籠から芯鉄筋までの距離が長くなり、鋼管と組み付け材とを結束鉄線にて固定する作業が困難になる。   In the structure of the pile head described in Patent Document 1, the positioning work of the core rebar group is required. However, the structure of the assembly material is not materialized, how to fix the steel pipe to the rebar rod and how Thus, it is not specified whether the core reinforcing bar group is positioned. In this pile head structure, the larger the pile diameter, the longer the distance from the reinforcing bar rod to the core rebar, and the more difficult it is to fix the steel pipe and the assembly material with the bundled iron wire.

本発明は、上記事情に鑑みてなされたものであり、芯鉄筋や二重鉄筋の内周側の鉄筋等の杭内の鉄筋を、良好な施工性をもって、良好に位置決めされるように配筋することを課題とするものである。   The present invention has been made in view of the above circumstances, and the reinforcing bars in the pile such as the reinforcing bars on the inner peripheral side of the core reinforcing bars and the double reinforcing bars are arranged with good workability so as to be positioned well. It is an object to do.

上記課題を解決するために、本発明に係る杭の構築方法は、複数の鉄筋を有する鉄筋群が埋設された杭の構築方法であって、杭の外周部に部材支持部を設け、前記鉄筋群を固定した鉄筋群固定部と、前記鉄筋群固定部の外周側に設けられ前記部材支持部に支持固定される支持固定部とを一体で形成した部材を用いて、前記鉄筋群を杭内で位置決めし固定する。   In order to solve the above-described problem, a pile construction method according to the present invention is a pile construction method in which a reinforcing bar group having a plurality of reinforcing bars is embedded, and a member support portion is provided on an outer peripheral portion of the pile, and the reinforcing bars Using a member formed integrally with a reinforcing bar group fixing portion that fixes a group and a support fixing portion that is provided on the outer peripheral side of the reinforcing bar group fixing portion and is supported and fixed to the member support portion, Position and fix with.

上記杭の構築方法において、杭の外周部に鉄筋籠を設け、前記部材支持部を前記鉄筋籠に固定してもよい。   In the pile construction method, a reinforcing bar rod may be provided on the outer peripheral portion of the pile, and the member support portion may be fixed to the reinforcing bar rod.

また、本発明に係る杭の施工方法は、複数の鉄筋を有する鉄筋群が埋設された杭の施工方法であって、杭を形成するための孔を掘削する工程と、杭の外周部に設ける部材支持部を、前記孔の上方に配置する工程と、前記鉄筋群を固定した鉄筋群固定部と、前記鉄筋群固定部の外周側に設けられた支持固定部とを一体で形成した部材を、前記孔の上方に配置し、前記支持固定部を前記部材支持部に支持固定する工程と、前記部材を支持固定した前記部材支持部を前記孔の内部に下降させる工程と、前記孔にコンクリートを打設する工程と、を備える。   Moreover, the pile construction method according to the present invention is a pile construction method in which a reinforcing bar group having a plurality of reinforcing bars is embedded, and a step of excavating a hole for forming a pile and an outer peripheral portion of the pile are provided. A member in which a step of disposing a member support portion above the hole, a reinforcing bar group fixing portion fixing the reinforcing bar group, and a supporting fixing portion provided on the outer peripheral side of the reinforcing bar group fixing portion are integrally formed. A step of supporting and fixing the support fixing portion to the member support portion, a step of lowering the member support portion supporting and fixing the member to the inside of the hole, and a concrete in the hole And a step of placing.

また、本発明に係る鉄筋群の位置決め固定用の部材は、複数の鉄筋を有する鉄筋群が埋設された杭を構築する際に用いられ、前記鉄筋群を杭内で位置決めし固定するための部材であって、前記鉄筋群を固定した鉄筋群固定部と、前記鉄筋群固定部の外周側に設けられ、杭の外周部に設けられる部材支持部に支持固定される支持固定部とを一体で形成している。   Moreover, the member for positioning and fixing the reinforcing bar group according to the present invention is used when a pile in which a reinforcing bar group having a plurality of reinforcing bars is embedded is constructed, and the member for positioning and fixing the reinforcing bar group in the pile. The reinforcing bar group fixing part that fixes the reinforcing bar group and the support fixing part that is provided on the outer peripheral side of the reinforcing bar group fixing part and supported and fixed to the member support part provided on the outer peripheral part of the pile. Forming.

本発明によれば、芯鉄筋や二重鉄筋の内周側の鉄筋等の杭内の鉄筋を、良好な施工性をもって、良好に位置決めされるように配筋することができる。   ADVANTAGE OF THE INVENTION According to this invention, the reinforcing bar in piles, such as a reinforcing bar of the inner periphery side of a core reinforcing bar or a double reinforcing bar, can be arranged so that it may be satisfactorily positioned with good workability.

一実施形態に係る杭の構造を示す鉛直断面図(図2の1−1断面図)である。It is a vertical sectional view (1-1 sectional view of Drawing 2) showing the structure of the pile concerning one embodiment. 図1における2−2断面図である。It is 2-2 sectional drawing in FIG. 一実施形態に係る杭の施工方法を説明するための鉛直断面図である。It is a vertical sectional view for explaining the construction method of the pile concerning one embodiment. 一実施形態に係る杭の施工方法を説明するための鉛直断面図である。It is a vertical sectional view for explaining the construction method of the pile concerning one embodiment. 一実施形態に係る杭の施工方法を説明するための鉛直断面図である。It is a vertical sectional view for explaining the construction method of the pile concerning one embodiment. 比較例に係る杭の構造を示す鉛直断面図(図7の6−6断面図)である。It is a vertical sectional view (6-6 sectional view of Drawing 7) showing the structure of the pile concerning a comparative example. 図6における7−7断面図である。It is 7-7 sectional drawing in FIG. 比較例に係る杭の施工方法を説明するための鉛直断面図である。It is a vertical sectional view for explaining a construction method of a pile according to a comparative example. 他の実施形態に係る杭の構造を示す鉛直断面図(図10の9−9断面図)である。It is a vertical sectional view (9-9 sectional view of Drawing 10) showing the structure of the pile concerning other embodiments. 図9における10−10断面図である。FIG. 10 is a cross-sectional view taken along 10-10 in FIG. 9. 他の実施形態に係る杭の施工方法を説明するための鉛直断面図である。It is a vertical sectional view for explaining a construction method of a pile according to another embodiment.

以下、本発明の一実施形態を、図面を参照しながら説明する。図1は、一実施形態に係る杭10の頭部構造を示す鉛直断面図(図2の1−1断面図)である。また、図2は、図1における2−2断面図である。これらの図に示すように、杭10の上端には、杭径よりも小径の小径部20が構築されており、この小径部20と基礎1とが接合されている。この小径部20は、鋼管22の内部にコンクリートを充填した鋼管コンクリートである。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view (1-1 sectional view of FIG. 2) showing a head structure of a pile 10 according to an embodiment. 2 is a cross-sectional view taken along the line 2-2 in FIG. As shown in these drawings, a small-diameter portion 20 having a smaller diameter than the pile diameter is constructed at the upper end of the pile 10, and the small-diameter portion 20 and the foundation 1 are joined. The small diameter portion 20 is steel pipe concrete in which concrete is filled in the steel pipe 22.

杭10は、円柱状の鉄筋コンクリート製の杭であり、場所打ちコンクリート杭である。杭10の外周部には、鉄筋籠30が埋設され、杭10における鉄筋籠30の内周側には、複数の芯鉄筋40を有する芯鉄筋群42が埋設されている。鉄筋籠30は、杭10の周方向に所定間隔おきに配された複数の杭主筋32と、杭10の軸方向に所定間隔おきに配された複数のフープ筋34とを備えている。また、複数の杭主筋32は、各フープ筋34に沿って配されており、番線によって各フープ筋34に緊結されている。複数の芯鉄筋40は、杭芯を中心として矩形状に配されており、下側は杭10の頭部に埋設され、上側は基礎1に埋設されている。   The pile 10 is a column-shaped reinforced concrete pile and is a cast-in-place concrete pile. A reinforcing bar 30 is embedded in the outer peripheral portion of the pile 10, and a core reinforcing bar group 42 having a plurality of core reinforcing bars 40 is embedded on the inner peripheral side of the reinforcing bar 30 in the pile 10. The reinforcing bar 30 includes a plurality of pile main bars 32 arranged at predetermined intervals in the circumferential direction of the pile 10 and a plurality of hoop bars 34 arranged at predetermined intervals in the axial direction of the pile 10. The plurality of pile main bars 32 are arranged along the respective hoop bars 34, and are tightly connected to the respective hoop bars 34 by a line. The plurality of core rebars 40 are arranged in a rectangular shape with the pile core as the center, the lower side is embedded in the head of the pile 10, and the upper side is embedded in the foundation 1.

ここで、杭10の頭部には、上下一対の位置決め固定用部材50が埋設されている。また、鉄筋籠30には、各段4個のアングル62からなる上下2段の部材支持部60が設けられている。位置決め固定用部材50は、複数の鋼材51、53を溶接等により接合してなる構造体であり、杭芯を中心とする矩形状の芯鉄筋群固定部52と、芯鉄筋群固定部52の角部から杭10の外周側へ延びる4本の軸部からなる支持固定部54とが一体化された構成をしている。   Here, a pair of upper and lower positioning fixing members 50 are embedded in the head of the pile 10. Further, the reinforcing bar 30 is provided with two upper and lower member support portions 60 each having four angles 62. The positioning and fixing member 50 is a structure formed by joining a plurality of steel materials 51 and 53 by welding or the like, and includes a rectangular core rebar group fixing portion 52 centered on a pile core, and a core rebar group fixing portion 52. The support fixing part 54 which consists of four axial parts extended from the corner | angular part to the outer peripheral side of the pile 10 is comprised.

位置決め固定用部材50は、互に平行に配された一対の長尺の鋼材51と、互に平行、且つ鋼材51に対して直角に配された一対の短尺の鋼材53とで構成されており、一対の鋼材53の両端が、一対の鋼材51の中間部に接合されている。芯鉄筋群固定部52は、一対の鋼材51の中間部と一対の鋼材53とにより構成されている。また、支持固定部54は、一対の鋼材51における芯鉄筋群固定部52から外周側へ延びる部分により構成されている。   The positioning and fixing member 50 includes a pair of long steel materials 51 arranged in parallel to each other and a pair of short steel materials 53 arranged in parallel to each other and at right angles to the steel materials 51. The both ends of the pair of steel materials 53 are joined to the intermediate portion of the pair of steel materials 51. The core reinforcing bar group fixing portion 52 includes an intermediate portion of a pair of steel materials 51 and a pair of steel materials 53. Further, the support fixing portion 54 is configured by a portion extending from the core rebar group fixing portion 52 to the outer peripheral side in the pair of steel materials 51.

上下一対の芯鉄筋群固定部52には、複数の芯鉄筋40が番線や金物等により緊結されている。即ち、1本の芯鉄筋40の上下2箇所が、上下一対の芯鉄筋群固定部52の鋼材51、53に固定されている。ここで、矩形状の芯鉄筋群固定部52に、その周方向に所定間隔おきに配された複数の芯鉄筋40が固定されることにより、複数の芯鉄筋40からなる芯鉄筋群42の形状が矩形柱状に保持されている。   A plurality of core rebars 40 are fastened to the pair of upper and lower core rebar group fixing portions 52 by a wire or a hardware. That is, two upper and lower portions of one core rebar 40 are fixed to the steel members 51 and 53 of the pair of upper and lower core rebar group fixing portions 52. Here, the shape of the core reinforcing bar group 42 including the plurality of core reinforcing bars 40 is fixed to the rectangular core reinforcing bar group fixing portion 52 by fixing a plurality of core reinforcing bars 40 arranged at predetermined intervals in the circumferential direction. Is held in a rectangular column shape.

部材支持部60の4個のアングル62は、同じ高さにおいて、杭芯を中心とする矩形状に配されており、鉄筋籠30のフープ筋34に番線やシャックル等により固定されている。ここで、各アングル62上には、支持固定部54の鋼材51の端部が載置され、当該端部が各アングル62に溶接されている。これにより、位置決め固定用部材50の高さおよび平面内での位置が決められ、以って、芯鉄筋群42の高さおよび平面内での位置が決められている。   The four angles 62 of the member support portion 60 are arranged in a rectangular shape centered on the pile core at the same height, and are fixed to the hoop bar 34 of the reinforcing bar 30 by a wire or a shackle. Here, on each angle 62, an end portion of the steel material 51 of the support fixing portion 54 is placed, and the end portion is welded to each angle 62. Thereby, the height of the positioning and fixing member 50 and the position in the plane are determined, and thus the height of the core reinforcing bar group 42 and the position in the plane are determined.

図3〜図5は、杭10の施工方法を説明するための鉛直断面図である。これらの図に示すように、杭10は、場所打ち杭工法を用いて施工する。まず、機械掘削工法により地盤を掘削して孔11を構築する工程を実施し、鉄筋籠30を孔11の中に建て込む工程を実施する。ここで、図3に示すように、鉄筋籠30を建て込む工程では、予め組み立てられた鉄筋籠30をクレーンで孔11の所定の位置まで降下させるが、その際一旦、鉄筋籠30を、その上部(少なくとも上下2段の部材支持部60を含む範囲)が孔11から上方に突出する位置で停止させる。   3 to 5 are vertical cross-sectional views for explaining a construction method of the pile 10. As shown in these figures, the pile 10 is constructed using the cast-in-place pile method. First, a step of excavating the ground by a mechanical excavation method to build the hole 11 is performed, and a step of building the reinforcing bar 30 in the hole 11 is performed. Here, as shown in FIG. 3, in the step of building the reinforcing bar rod 30, the pre-assembled reinforcing bar rod 30 is lowered to a predetermined position of the hole 11 with a crane. The upper portion (a range including at least the upper and lower two-stage member support portions 60) is stopped at a position protruding upward from the hole 11.

次に、図4に示すように、芯鉄筋群42が予め固定された位置決め固定用部材50を、鉄筋籠30の上部に上方から挿入し、下段の支持固定部54の鋼材51の端部を、下段の部材支持部60の各アングル62上に、上段の支持固定部54の鋼材51の端部を、上段の部材支持部60の各アングル62上に、それぞれ載置する。この際、位置決め固定用部材50を、杭10の周方向に僅かにずらした状態で下降させることにより、下段の支持固定部54の鋼材51と、上段の部材支持部60の各アングル62との干渉を回避する。そして、下段の支持固定部54を上下の部材支持部60の間まで降下させてから、位置決め固定用部材50の周方向の位置を調整する。   Next, as shown in FIG. 4, the positioning and fixing member 50 with the core reinforcing bar group 42 fixed in advance is inserted into the upper part of the reinforcing bar rod 30 from above, and the end portion of the steel member 51 of the lower support fixing portion 54 is inserted. The end portions of the steel material 51 of the upper support fixing portion 54 are placed on the angles 62 of the upper member support portion 60 on the respective angles 62 of the lower member support portion 60. At this time, by lowering the positioning and fixing member 50 in a state slightly shifted in the circumferential direction of the pile 10, the steel material 51 of the lower support fixing portion 54 and each angle 62 of the upper member support portion 60 are arranged. Avoid interference. Then, after lowering the lower support fixing portion 54 between the upper and lower member support portions 60, the circumferential position of the positioning fixing member 50 is adjusted.

次に、下段の支持固定部54の鋼材51の端部を、下段の部材支持部60の各アングル62に、上段の支持固定部54の鋼材51の端部を、上段の部材支持部60の各アングル62に、それぞれ溶接する。そして、図5に示すように、鉄筋籠30を孔11の所定の位置まで降下させた後、孔11内にコンクリートを打設する。その後、杭10の頭部の斫り工程を実施して気中コンクリートを打設する際に、小径部20を構築するための型枠となる鋼管22を、その内部に芯鉄筋群42が挿通されるように、杭10の頭部に設置する。その後、基礎1を構築する。   Next, end portions of the steel material 51 of the lower support fixing portion 54 are respectively connected to the angles 62 of the lower member support portion 60, and end portions of the steel material 51 of the upper support fixing portion 54 are connected to the upper member support portion 60. Each angle 62 is welded. Then, as shown in FIG. 5, after the reinforcing bar 30 is lowered to a predetermined position of the hole 11, concrete is placed in the hole 11. Then, when carrying out the turning process of the head of the pile 10 and placing the aerial concrete, the core rebar group 42 is inserted into the steel pipe 22 which becomes a mold for constructing the small diameter portion 20. To be installed on the head of the pile 10. Then, foundation 1 is constructed.

図6は、比較例に係る杭200の構造を示す鉛直断面図(図7の6−6断面図)である。また、図7は、図6における7−7断面図である。これらの図に示すように、杭200は、上述の位置決め固定用部材50が用いられておらず、芯鉄筋群固定部252と支持固定部254とが予め別々の構造体として構成され、杭200を施工する際に一体化される点で、杭10とは相違する。   FIG. 6 is a vertical cross-sectional view (cross-sectional view along 6-6 in FIG. 7) showing the structure of the pile 200 according to the comparative example. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. As shown in these drawings, the pile 200 does not use the positioning and fixing member 50 described above, and the core reinforcing bar group fixing portion 252 and the support fixing portion 254 are configured as separate structures in advance, and the pile 200 It differs from the pile 10 by the point integrated when constructing.

芯鉄筋群固定部252は、4枚の鋼板を溶接して矩形枠状に形成されており、芯鉄筋群固定部252には、矩形状に配された複数の芯鉄筋40が番線により緊結されている。また、支持固定部254は、一対の鋼板251により構成されている。一対の鋼板251は、その端部が部材支持部60の各アングル62上に載置されるように配されており、一対の鋼板251の端部は、各アングル62に溶接されている。また、芯鉄筋群固定部252は、一対の鋼板251の中間部の上に載置されており、一対の鋼板251の中間部に溶接されている。   The core rebar group fixing portion 252 is formed in a rectangular frame shape by welding four steel plates, and a plurality of core rebars 40 arranged in a rectangular shape are fastened to the core rebar group fixing portion 252 by a wire. ing. Further, the support fixing portion 254 is constituted by a pair of steel plates 251. The pair of steel plates 251 are arranged so that the end portions thereof are placed on the respective angles 62 of the member support portion 60, and the end portions of the pair of steel plates 251 are welded to the respective angles 62. Further, the core reinforcing bar group fixing portion 252 is placed on the intermediate portion of the pair of steel plates 251 and is welded to the intermediate portion of the pair of steel plates 251.

図8は、杭200の施工方法を説明するための鉛直断面図である。杭200の施工においては、上述の杭10の施工と同様に、孔11を構築し、鉄筋籠30を、その上部が孔11から上方に突出する位置まで降下させる。次に、芯鉄筋群42が予め固定された上下一対の芯鉄筋群固定部252を、鉄筋籠30の上部に上方から挿入して、この状態でこれらの高さと平面内の位置とを調整した後に、下段の支持固定部254を構成する一対の鋼板251を、側方から下段の部材支持部60と下段の支持固定部254との間に挿入して、その端部を下段の部材支持部60の各アングル62上に載置する。また、上段の支持固定部254を構成する一対の鋼板251を、側方から上段の部材支持部60と上段の支持固定部254との間に挿入して、その端部を上段の部材支持部60の各アングル62上に載置する。また、下段の芯鉄筋群固定部252を下段の支持固定部254の上に、上段の芯鉄筋群固定部252を上段の支持固定部254の上に、それぞれ載置する。   FIG. 8 is a vertical cross-sectional view for explaining a construction method of the pile 200. In the construction of the pile 200, as in the construction of the above-described pile 10, the hole 11 is constructed, and the reinforcing bar 30 is lowered to a position where the upper part protrudes upward from the hole 11. Next, a pair of upper and lower core reinforcing bar group fixing portions 252 with the core reinforcing bar group 42 fixed in advance were inserted into the upper part of the reinforcing bar rod 30 from above, and in this state, their height and position in the plane were adjusted. Later, a pair of steel plates 251 constituting the lower support fixing portion 254 are inserted between the lower member support portion 60 and the lower support fixing portion 254 from the side, and the end portion of the pair of steel plate 251 is the lower member support portion. It is placed on each of the 60 angles 62. Further, a pair of steel plates 251 constituting the upper support fixing portion 254 is inserted between the upper member support portion 60 and the upper support fixing portion 254 from the side, and the end portion of the pair of steel plate 251 is the upper member support portion. It is placed on each of the 60 angles 62. Further, the lower core reinforcing bar group fixing portion 252 is placed on the lower support fixing portion 254, and the upper core reinforcing bar group fixing portion 252 is placed on the upper support fixing portion 254, respectively.

次に、上下2対の鋼板251の端部を、上下2段の部材支持部60の各アングル62に溶接する。また、下段の芯鉄筋群固定部252を下段の支持固定部254に、上段の芯鉄筋群固定部252を上段の支持固定部254に、それぞれ、番線により緊結する。そして、杭10と同様、鉄筋籠30を孔11の所定の位置まで降下させた後、孔11内にコンクリートを打設する。また、小径部20を構築し、その上に基礎1を構築する。   Next, the ends of the upper and lower two pairs of steel plates 251 are welded to the respective angles 62 of the upper and lower two-stage member support portions 60. In addition, the lower core reinforcing bar group fixing portion 252 is fastened to the lower support fixing portion 254, and the upper core reinforcing bar group fixing portion 252 is fastened to the upper support fixing portion 254 by a wire. Then, like the pile 10, the steel bar 30 is lowered to a predetermined position in the hole 11, and then concrete is placed in the hole 11. Moreover, the small diameter part 20 is constructed | assembled and the foundation 1 is constructed | assembled on it.

ここで、芯鉄筋群固定部252を支持固定部254に固定する作業は、鉄筋籠30の外側から行わなければならないところ、杭径の大きさによっては、鉄筋籠30から芯鉄筋群固定部252と支持固定部254との固定部までの距離が、当該固定部まで作業者の手が届かないような距離になり、作業ができなくなる。   Here, the operation of fixing the core reinforcing bar group fixing portion 252 to the support fixing portion 254 must be performed from the outside of the reinforcing bar rod 30. The distance between the support fixing portion 254 and the fixing portion becomes such a distance that the operator cannot reach the fixing portion, and the work cannot be performed.

また、芯鉄筋群固定部252及びこれに固定された芯鉄筋群42の平面内の位置を調整する作業は、これらを浮かせた状態で行わなければならないことから、位置を確定させ難く、施工性に問題がある。   Moreover, since the operation | work which adjusts the position in the plane of the core rebar group fixing | fixed part 252 and the core rebar group 42 fixed to this must be performed in the state which floated these, it is difficult to fix a position and construction property There is a problem.

さらに、複数の芯鉄筋40からなる芯鉄筋群42の矩形柱状の形状を保持するための芯鉄筋群固定部252と、芯鉄筋群42の高さ及び平面内の位置を確定させるための支持固定部254とを別部材で構成することによるコスト増という問題もある。   Further, a core reinforcing bar group fixing portion 252 for holding the rectangular columnar shape of the core reinforcing bar group 42 composed of a plurality of core reinforcing bars 40, and support fixing for determining the height and position of the core reinforcing bar group 42 in the plane. There is also a problem that the cost is increased by configuring the portion 254 with a separate member.

これに対して、本実施形態に係る杭10の構築方法および施工方法では、芯鉄筋群固定部52と支持固定部54とを予め一体化した位置決め固定用部材50を用いて、芯鉄筋群42を鉄筋籠30に位置決めし固定する。このため、位置決め固定用部材50の外周側の端部である鋼材51の端部を、鉄筋籠30に設けられたアングル62に固定するのみで、芯鉄筋群42を鉄筋籠30に固定することができる。従って、杭径の大きさにかかわらず、芯鉄筋群42を鉄筋籠30に固定する作業の位置を、作業者の手が届く位置にすることができ、作業可能とすることができる。   On the other hand, in the construction method and construction method of the pile 10 according to the present embodiment, the core reinforcing bar group 42 using the positioning fixing member 50 in which the core reinforcing bar group fixing part 52 and the support fixing part 54 are integrated in advance. Is positioned and fixed to the reinforcing bar 30. For this reason, the core rebar group 42 is fixed to the reinforcing bar rod 30 only by fixing the end portion of the steel material 51 which is the outer peripheral end portion of the positioning fixing member 50 to the angle 62 provided in the reinforcing bar rod 30. Can do. Therefore, regardless of the size of the pile diameter, the position of the work for fixing the core reinforcing bar group 42 to the reinforcing bar 30 can be set to a position that can be reached by the operator, and the work can be performed.

また、本実施形態に係る杭10の構築方法および施工方法によれば、芯鉄筋群42が固定された位置決め固定用部材50を、鉄筋籠30に設けられた4個のアングル62で支えた状態で、芯鉄筋群42の平面内の位置の調整を行うことができる。従って、芯鉄筋群42の高さ及び平面内の位置を確定させ易く、施工性が良好である。   Moreover, according to the construction method and construction method of the pile 10 according to the present embodiment, the positioning and fixing member 50 to which the core reinforcing bar group 42 is fixed is supported by the four angles 62 provided on the reinforcing bar rod 30. Thus, the position of the core reinforcing bar group 42 in the plane can be adjusted. Therefore, it is easy to determine the height of the core rebar group 42 and the position in the plane, and the workability is good.

また、本実施形態に係る杭10の構築方法および施工方法によれば、複数の芯鉄筋40からなる芯鉄筋群42の矩形柱状の形状を保持するための芯鉄筋群固定部52と、芯鉄筋群42の高さ及び平面内の位置を確定させるための支持固定部54とを同一部品で構成することによって、部品コストを低減できる。   Moreover, according to the construction method and construction method of the pile 10 according to the present embodiment, the core reinforcing bar group fixing portion 52 for holding the rectangular columnar shape of the core reinforcing bar group 42 including the plurality of core reinforcing bars 40, and the core reinforcing bar By configuring the supporting and fixing portion 54 for determining the height of the group 42 and the position in the plane with the same component, the component cost can be reduced.

また、本実施形態に係る杭10によれば、杭10と基礎1とが、杭径よりも小径の小径部20により接合されている。これにより、杭10と基礎1との接合部の回転拘束を減らすことができ、基礎1及びその上の建物が地震時の水平力を受けた場合に、杭10と基礎1との接合部の曲げ変形性能を確保し、当該接合部に生じる曲げモーメントを緩和することができる。従って、当該接合部におけるせん断耐力及び圧縮並びに引張耐力を向上させることができる。   Moreover, according to the pile 10 which concerns on this embodiment, the pile 10 and the foundation 1 are joined by the small diameter part 20 smaller in diameter than a pile diameter. Thereby, the rotation restraint of the junction part of the pile 10 and the foundation 1 can be reduced, and when the foundation 1 and the building on it receive the horizontal force at the time of an earthquake, of the junction part of the pile 10 and the foundation 1 Bending deformation performance can be ensured and bending moment generated at the joint can be relaxed. Therefore, it is possible to improve the shear strength, compression and tensile strength at the joint.

図9は、他の実施形態に係る杭100の構造を示す鉛直断面図である。また、図10は、図9における10−10断面図である。これらの図に示すように、杭100は、上述の鉄筋籠30および芯鉄筋群42に替えて二重鉄筋110を設け、位置決め固定用部材50に替えて位置決め固定用部材150を設けている点で、杭10とは相違する。   FIG. 9 is a vertical cross-sectional view showing the structure of a pile 100 according to another embodiment. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. As shown in these drawings, the pile 100 is provided with a double reinforcing bar 110 in place of the above-described reinforcing bar rod 30 and the core reinforcing bar group 42, and a positioning and fixing member 150 in place of the positioning and fixing member 50. Thus, it is different from the pile 10.

二重鉄筋110は、鉄筋籠30と同様の構成の鉄筋籠130と、鉄筋籠130の上部の内周側に杭100の周方向に沿って配筋された複数の鉄筋140とを備えている。また、位置決め固定用部材150は、杭芯を中心とする円状の鋼材からなる鉄筋群固定部152と、鉄筋群固定部152から両側へ延びる二対の鋼材151からなる支持固定部154とが一体化された構成をしている。各対の鋼材151は、平行に配されている。   The double reinforcing bar 110 includes a reinforcing bar rod 130 having the same configuration as the reinforcing bar rod 30, and a plurality of reinforcing bars 140 arranged along the circumferential direction of the pile 100 on the inner peripheral side of the upper portion of the reinforcing bar rod 130. . Further, the positioning and fixing member 150 includes a reinforcing bar group fixing portion 152 made of a circular steel material centering on the pile core, and a support fixing portion 154 made of two pairs of steel materials 151 extending from the reinforcing bar group fixing portion 152 to both sides. It has an integrated configuration. Each pair of steel materials 151 is arranged in parallel.

上下一対の鉄筋群固定部152には、複数の鉄筋140が番線により緊結されている。即ち、1本の芯鉄筋140の上下2箇所が、上下一対の鉄筋群固定部152に固定されている。ここで、円状の鉄筋群固定部152に、その周方向に所定間隔おきに配された複数の鉄筋140が固定されることにより、複数の鉄筋140からなる鉄筋群142の形状が円柱状に保持されている。   A plurality of reinforcing bars 140 are fastened to the pair of upper and lower reinforcing bar group fixing portions 152 by a wire. That is, two upper and lower portions of one core reinforcing bar 140 are fixed to a pair of upper and lower reinforcing bar group fixing portions 152. Here, the plurality of reinforcing bars 140 arranged at predetermined intervals in the circumferential direction are fixed to the circular reinforcing bar group fixing portion 152, so that the shape of the reinforcing bar group 142 including the plurality of reinforcing bars 140 is cylindrical. Is retained.

部材支持部60の4個のアングル62は、鉄筋籠130のフープ筋34に番線やシャックル等により固定されている。ここで、各アングル62上には、支持固定部154の鋼材151の端部が載置され、当該端部が各アングル62に溶接されている。これにより、位置決め固定用部材150の高さおよび平面内での位置が決められ、以って、鉄筋群140の高さおよび平面内での位置が決められている。   The four angles 62 of the member support part 60 are fixed to the hoop bar 34 of the reinforcing bar 130 by a wire or a shackle. Here, on each angle 62, an end portion of the steel material 151 of the support fixing portion 154 is placed, and the end portion is welded to each angle 62. Thereby, the height of the positioning and fixing member 150 and the position in the plane are determined, and thus the height of the reinforcing bar group 140 and the position in the plane are determined.

図11は、杭100の施工方法を説明するための鉛直断面図である。杭100の施工においては、上述の杭10の施工と同様に、孔11を構築し、鉄筋籠130を、その上部が孔11から上方に突出する位置まで降下させる。次に、鉄筋群142が固定された上下一対の位置決め固定用部材150を、鉄筋籠130の上部に上方から挿入し、下段の支持固定部154の鋼材151の端部を、下段の部材支持部60の各アングル62上に、上段の支持固定部154の鋼材151の端部を、上段の部材支持部60の各アングル62上に、それぞれ載置する。この際、位置決め固定用部材150を、杭100の周方向に僅かにずらした状態で下降させることにより、下段の支持固定部154の鋼材151と、上段の部材支持部60の各アングル62との干渉を回避する。そして、下段の支持固定部154を上下の部材支持部60の間まで降下させてから、位置決め固定用部材150の周方向の位置を調整する。   FIG. 11 is a vertical cross-sectional view for explaining a construction method of the pile 100. In the construction of the pile 100, similarly to the construction of the above-described pile 10, the hole 11 is constructed, and the reinforcing bar 130 is lowered to a position where the upper portion protrudes upward from the hole 11. Next, a pair of upper and lower positioning fixing members 150 to which the reinforcing bar group 142 is fixed are inserted into the upper part of the reinforcing bar rod 130 from above, and the end portion of the steel member 151 of the lower support fixing portion 154 is inserted into the lower member support portion. The end portions of the steel members 151 of the upper support fixing portions 154 are placed on the respective angles 62 of the upper member support portion 60. At this time, the positioning and fixing member 150 is lowered in a state slightly shifted in the circumferential direction of the pile 100, so that the steel material 151 of the lower support fixing portion 154 and each angle 62 of the upper member support portion 60 Avoid interference. Then, after the lower support fixing portion 154 is lowered between the upper and lower member support portions 60, the circumferential position of the positioning fixing member 150 is adjusted.

次に、下段の支持固定部154の鋼材151の端部を、下段の部材支持部60の各アングル62に、上段の支持固定部154の鋼材151の端部を、上段の部材支持部60の各アングル62に、それぞれ溶接する。そして、杭10と同様、鉄筋籠130を孔11の所定の位置まで降下させた後、孔11内にコンクリートを打設する。また、小径部20を構築し、その上に基礎1を構築する。   Next, end portions of the steel material 151 of the lower support fixing portion 154 are respectively connected to the angles 62 of the lower member support portion 60, and end portions of the steel material 151 of the upper support fixing portion 154 are connected to the upper member support portion 60. Each angle 62 is welded. Then, like the pile 10, the steel bar 130 is lowered to a predetermined position of the hole 11, and then concrete is placed in the hole 11. Moreover, the small diameter part 20 is constructed | assembled and the foundation 1 is constructed | assembled on it.

以上、本実施形態に係る杭100の構築および施工方法では、鉄筋群固定部152と支持固定部154とが、予め一体化された位置決め固定用部材150を用いて、鉄筋群142を鉄筋籠130に固定するため、杭径の大きさにかかわらず、鉄筋群142を鉄筋籠130に固定する作業の位置を、作業者の手が届く位置にすることができ、作業可能とすることができる。   As described above, in the construction and construction method of the pile 100 according to the present embodiment, the reinforcing bar group 142 is connected to the reinforcing bar group 130 using the positioning fixing member 150 in which the reinforcing bar group fixing part 152 and the support fixing part 154 are integrated in advance. Therefore, regardless of the pile diameter, the position of the operation for fixing the reinforcing bar group 142 to the reinforcing bar rod 130 can be set to a position that can be reached by the operator's hand.

また、鉄筋群142が固定された位置決め固定用部材150を、鉄筋籠130に設けられた4個のアングル62で支えた状態で、鉄筋群142の平面内の位置の調整を行うことができる。従って、鉄筋群142の高さ及び平面内の位置を確定させ易く、施工性が良好である。   Further, the position in the plane of the reinforcing bar group 142 can be adjusted in a state where the positioning fixing member 150 to which the reinforcing bar group 142 is fixed is supported by the four angles 62 provided on the reinforcing bar rod 130. Therefore, it is easy to determine the height of the reinforcing bar group 142 and the position in the plane, and the workability is good.

さらに、複数の鉄筋140からなる鉄筋群142の円柱状の形状を保持するための鉄筋群固定部152と、鉄筋群142の高さ及び平面内の位置を確定させるための支持固定部154とを同一部品で構成することによって、部品コストを低減できる。   Furthermore, a reinforcing bar group fixing part 152 for holding the columnar shape of the reinforcing bar group 142 composed of a plurality of reinforcing bars 140, and a support fixing part 154 for determining the height and position of the reinforcing bar group 142 in the plane. By using the same parts, the part cost can be reduced.

なお、上述の実施形態は、本発明の理解を容易にするためのものであり、本発明を限定するものではない。本発明はその趣旨を逸脱することなく、変更、改良され得ると共に本発明にはその等価物が含まれることは勿論である。例えば、上述の各実施形態では、場所打ち杭工法を用いた杭の構築および施工方法を例に挙げて本発明を説明したが、既製杭工法を用いた杭の構築および施工方法にも本発明を適用できる。ここで、既製杭工法を用いた杭の構築および施工方法に本発明を用いる場合には、鋼管杭やPHC杭の内周面に部材支持部60を設け、該部材支持部60に、芯鉄筋群42や鉄筋群142を固定した位置決め固定用部材50、150を固定すればよい。   In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in each of the above-described embodiments, the present invention has been described by taking the construction and construction method of a pile using the cast-in-place pile method as an example, but the present invention is also applied to the construction and construction method of a pile using a ready-made pile construction method. Can be applied. Here, when using this invention for the construction and construction method of a pile using a ready-made pile construction method, the member support part 60 is provided in the inner peripheral surface of a steel pipe pile or a PHC pile, and core reinforcement is provided in this member support part 60. The positioning fixing members 50 and 150 to which the group 42 and the reinforcing bar group 142 are fixed may be fixed.

また、上記各実施形態では、芯鉄筋40、鉄筋140の何れか一方のみを設けたが、これらの双方を設けてもよい。また、鉄筋籠30、130を設けたが、上述したように鋼管杭やPHC杭を用いるような場合には設けなくてもよい。さらに、上記各実施形態では、杭10、100と基礎1との接合部を小径部20としたが、これも必須ではない。   Moreover, in each said embodiment, although only any one of the core reinforcement 40 and the reinforcement 140 was provided, you may provide both of these. Moreover, although the reinforcing bar rods 30 and 130 are provided, it may not be provided when using steel pipe piles or PHC piles as described above. Furthermore, in each said embodiment, although the junction part of the piles 10 and 100 and the foundation 1 was made into the small diameter part 20, this is not essential.

1 基礎、10 杭、11 孔、20 小径部、22 鋼管、30 鉄筋籠、32 杭主筋、34 フープ筋、40 芯鉄筋(鉄筋)、42 芯鉄筋群(鉄筋群)、50 位置決め固定用部材(部材)、51 鋼材、52 芯鉄筋群固定部(鉄筋群固定部)、53 鋼材、54 支持固定部、60 部材支持部、62 アングル、100 杭、110 二重鉄筋、130 鉄筋籠、140 鉄筋、142 鉄筋群、150 位置決め固定用部材、151 鋼材、152 鉄筋群固定部、154 支持固定部、200 杭、251 鋼板、252 芯鉄筋群固定部、254 支持固定部 1 Foundation, 10 Pile, 11 Hole, 20 Small Diameter, 22 Steel Pipe, 30 Reinforcing Bar, 32 Pile Main Bar, 34 Hoop Reinforcement, 40 Core Reinforcement (Rebar), 42 Core Reinforcement Group (Reinforcing Bar Group), 50 Positioning Fixing Member ( Member), 51 steel material, 52 core rebar group fixing part (rebar group fixing part), 53 steel material, 54 support fixing part, 60 member support part, 62 angle, 100 pile, 110 double rebar, 130 rebar rod, 140 rebar, 142 rebar group, 150 positioning fixing member, 151 steel material, 152 rebar group fixing part, 154 support fixing part, 200 pile, 251 steel plate, 252 core reinforcing bar group fixing part, 254 support fixing part

Claims (4)

複数の鉄筋を有する鉄筋群が埋設された杭の構築方法であって、
杭の外周部に部材支持部を設け、前記鉄筋群を固定した鉄筋群固定部と、前記鉄筋群固定部の外周側に設けられ前記部材支持部に支持固定される支持固定部とを一体で形成した部材を用いて、前記鉄筋群を杭内で位置決めし固定する杭の構築方法。
A method for constructing a pile in which a reinforcing bar group having a plurality of reinforcing bars is embedded,
A member support portion is provided on the outer peripheral portion of the pile, and the reinforcing bar group fixing portion that fixes the reinforcing bar group is integrated with a support fixing portion that is provided on the outer peripheral side of the reinforcing bar group fixing portion and is supported and fixed to the member support portion. A method for constructing a pile in which the reinforcing bars are positioned and fixed in the pile using the formed member.
杭の外周部に鉄筋籠を設け、前記部材支持部を前記鉄筋籠に固定する請求項1に記載の杭の構築方法。   The pile construction method according to claim 1, wherein a reinforcing bar is provided on an outer peripheral portion of the pile, and the member support portion is fixed to the reinforcing bar. 複数の鉄筋を有する鉄筋群が埋設された杭の施工方法であって、
杭を形成するための孔を掘削する工程と、
杭の外周部に設ける部材支持部を、前記孔の上方に配置する工程と、
前記鉄筋群を固定した鉄筋群固定部と、前記鉄筋群固定部の外周側に設けられた支持固定部とを一体で形成した部材を、前記孔の上方に配置し、前記支持固定部を前記部材支持部に支持固定する工程と、
前記部材を支持固定した前記部材支持部を前記孔の内部に下降させる工程と、
前記孔にコンクリートを打設する工程と、
を備える杭の施工方法。
It is a construction method of a pile in which a reinforcing bar group having a plurality of reinforcing bars is embedded,
Drilling holes to form piles;
A step of disposing a member support provided on the outer periphery of the pile above the hole;
A member formed integrally with a reinforcing bar group fixing portion fixing the reinforcing bar group and a supporting fixing portion provided on an outer peripheral side of the reinforcing bar group fixing portion is disposed above the hole, and the supporting fixing portion is A step of supporting and fixing to the member support portion;
Lowering the member support portion supporting and fixing the member into the hole;
Placing concrete in the hole;
Pile construction method comprising
複数の鉄筋を有する鉄筋群が埋設された杭を構築する際に用いられ、前記鉄筋群を杭内で位置決めし固定するための部材であって、
前記鉄筋群を固定する鉄筋群固定部と、前記鉄筋群固定部の外周側に設けられ、杭の外周部に設けられる部材支持部に支持固定される支持固定部とを一体で形成した鉄筋群の位置決め固定用の部材。
It is used when building a pile in which a reinforcing bar group having a plurality of reinforcing bars is embedded, and is a member for positioning and fixing the reinforcing bar group in the pile,
Reinforcing bar group formed integrally with a reinforcing bar group fixing part for fixing the reinforcing bar group and a support fixing part provided on the outer peripheral side of the reinforcing bar group fixing part and supported and fixed to a member support part provided on the outer peripheral part of the pile. A member for positioning and fixing.
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JP2014189987A (en) * 2013-03-26 2014-10-06 Ohbayashi Corp Joining structure and method between head and foundation of cast-in-site concrete pile
CN111455987A (en) * 2020-04-22 2020-07-28 中交第二航务工程局有限公司 Centering device and centering method for bored pile reinforcement cage

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JP2002339351A (en) * 2001-05-11 2002-11-27 Kurosawa Construction Co Ltd Cage for pile foundation, foundation structure and construction method therefor
JP2007278037A (en) * 2006-04-12 2007-10-25 Senshu Iwatani:Kk Method for preventing deformation of wire-cylinder, fixing metal fitting used in method, wire-cylinder and method for installing wire-cylinder
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JP2001295290A (en) * 2000-04-10 2001-10-26 Shimizu Corp Pile-to-footing connection structure and method of constructing therefor
JP2002339351A (en) * 2001-05-11 2002-11-27 Kurosawa Construction Co Ltd Cage for pile foundation, foundation structure and construction method therefor
JP2007278037A (en) * 2006-04-12 2007-10-25 Senshu Iwatani:Kk Method for preventing deformation of wire-cylinder, fixing metal fitting used in method, wire-cylinder and method for installing wire-cylinder
JP2009174302A (en) * 2007-12-27 2009-08-06 Hazama Corp Pile head treating method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014189987A (en) * 2013-03-26 2014-10-06 Ohbayashi Corp Joining structure and method between head and foundation of cast-in-site concrete pile
CN111455987A (en) * 2020-04-22 2020-07-28 中交第二航务工程局有限公司 Centering device and centering method for bored pile reinforcement cage
CN111455987B (en) * 2020-04-22 2021-11-02 中交第二航务工程局有限公司 Centering device and centering method for bored pile reinforcement cage

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