JP5596638B2

JP5596638B2 - Winding rebar

Info

Publication number: JP5596638B2
Application number: JP2011178706A
Authority: JP
Inventors: 克秀森本; 宏一西山; 治山口; 憲沼田
Original assignee: Okumura Corp
Current assignee: Okumura Corp
Priority date: 2010-08-25
Filing date: 2011-08-18
Publication date: 2014-09-24
Anticipated expiration: 2031-08-18
Also published as: JP2012067585A

Description

本発明は、四角形の断面形状を有する既設コンクリート構造物を補強する補強体を既設コンクリート構造物の周囲に形成する際に、既設コンクリート構造物の外周面に沿って四角形の螺旋形状に設置される巻立て鉄筋、及び該巻立て鉄筋に用いる加工鉄筋に関する。 In the present invention, when a reinforcing body that reinforces an existing concrete structure having a square cross-sectional shape is formed around the existing concrete structure, it is installed in a square spiral shape along the outer peripheral surface of the existing concrete structure. The present invention relates to a wound reinforcing bar and a processed reinforcing bar used for the wound reinforcing bar.

例えば高架橋の橋脚、ビルの柱等を構成する四角形の断面形状を有するコンクリート柱や、コンクリート梁等のその他の四角形の断面形状を有する各種の既設コンクリート構造物を耐震補強するための補強構造として、例えばコンクリート柱の周囲に補強用の鉄筋を上下方向に所定のピッチで複数リング形状に巻立てると共に、巻立てた鉄筋を埋設するようにして、既設コンクリート構造物の外周部分に、コンクリートやモルタルを所定の厚さで打設したり吹き付けたりすることによって補強体を形成するものが知られている（例えば、特許文献１参照）。 For example, as a reinforcement structure for seismic reinforcement of various existing concrete structures having a rectangular cross-sectional shape, such as a viaduct pier, a pillar of a building, and other rectangular cross-sectional shapes such as concrete beams, For example, reinforcing steel bars around a concrete pillar are wound up in a plurality of ring shapes at a predetermined pitch in the vertical direction, and the rolled up steel bars are buried, so that concrete or mortar is placed on the outer periphery of the existing concrete structure. What forms a reinforcement body by casting or spraying by predetermined thickness is known (for example, refer patent document 1).

また、四角形の断面形状を有する既設コンクリート柱の周囲に補強用の鉄筋を上下方向に所定のピッチで複数リング形状に各々巻立ててゆく作業は、鉄筋は変形し難い材料であるため、リング形状を２分割した形状に加工した鉄筋を施工現場で各々溶接等によって接合して、各リング毎に鉄筋をリング形状に取り付けてゆく必要があることから、接合箇所が各リング毎に２箇所必要になって多くの手間がかかることになる。 In addition, the work of winding reinforcing bars around the existing concrete pillars having a square cross-sectional shape in a plurality of ring shapes at a predetermined pitch in the vertical direction is because the reinforcing bars are a material that is difficult to deform. Since it is necessary to join the reinforcing bars processed into a shape divided into two at the construction site by welding, etc., and attach the reinforcing bars in a ring shape for each ring, two joints are required for each ring It will be a lot of work.

このようなことから、一般の鉄筋よりも変形が容易な高強度鋼線を、四角形の断面形状のコンクリート柱の外周面に沿った、複数の矩形ループをなす螺旋状の束に加工して、ループ間の間隔を拡げるように高強度鋼線を弾性変形させつつ、既設コンクリート構造物の外周面に沿って、高強度鋼線を四角形の螺旋形状に連続して巻立ててゆくようにした補強構造も開発されている（例えば、特許文献２参照）。 For this reason, high-strength steel wires that are easier to deform than ordinary reinforcing bars are processed into spiral bundles that form a plurality of rectangular loops along the outer peripheral surface of a concrete column having a square cross-sectional shape, Reinforcing the high-strength steel wire by continuously winding it into a square spiral shape along the outer peripheral surface of the existing concrete structure while elastically deforming the high-strength steel wire to widen the space between the loops A structure has also been developed (see, for example, Patent Document 2).

特開平９−１５１６１３号公報JP-A-9-151613 特開平１０−１４８０３８号公報Japanese Patent Laid-Open No. 10-148038

特許文献２の補強構造では、溶接ではなく重ね部を長く設ける一方で、高強度鋼線は、高価な材料であるためコストがかかることになると共に、複数の矩形ループをなす螺旋状の束に加工すると、相当の重量となるため、専用の機械を用いて作業を行う必要を生じてさらにコストがかかることになる。このようなことから、入手が容易で安価な一般の鉄筋を使用して、専用の機械を用いることなく、四角形の断面形状を有する既設コンクリート構造物の外周面に沿って、補強用の鉄筋を所定のピッチで効率良く設置してゆくことを可能にする新たな技術の開発が望まれている。 In the reinforcement structure of Patent Document 2, while a long overlapping portion is provided instead of welding, a high-strength steel wire is expensive because it is an expensive material, and a spiral bundle that forms a plurality of rectangular loops. When processed, the weight becomes considerable, and it becomes necessary to perform work using a dedicated machine, which further increases costs. For this reason, reinforcing steel bars for reinforcement are provided along the outer peripheral surface of an existing concrete structure having a quadrangular cross-sectional shape, without using a dedicated machine, by using general reinforcing bars that are easily available and inexpensive. Development of a new technology that enables efficient installation at a predetermined pitch is desired.

本発明は、入手が容易で安価な一般の鉄筋を使用して、専用の機械を用いることなく、四角形の断面形状を有する既設コンクリート構造物の外周面に沿って、補強用の鉄筋を所定のピッチで効率良く設置してゆくことのできる巻立て鉄筋、及び該巻立て鉄筋に用いる加工鉄筋を提供することを目的とする。 The present invention uses a general steel bar that is easily available and inexpensive, and a reinforcing bar is provided along the outer peripheral surface of an existing concrete structure having a square cross-sectional shape without using a dedicated machine. An object of the present invention is to provide a wound reinforcing bar that can be efficiently installed at a pitch, and a processed reinforcing bar used for the wound reinforcing bar.

本発明は、四角形の断面形状を備える既設コンクリート構造物を補強する補強体を該既設コンクリート構造物の周囲に形成する際に、該既設コンクリート構造物の外周面に沿って四角形の螺旋形状に設置される巻立て鉄筋であって、折曲げ加工された複数の加工鉄筋を、これらの端部を接合して四角形の螺旋形状に連続させることによって前記既設コンクリート構造物の周囲に設置されるようになっており、前記加工鉄筋は、前記既設コンクリート構造物の四角形の断面形状の３つの辺部に沿ったコの字形状となるように、折れ曲がった２箇所の角部を備えるコの字状本体部と、該コの字状本体部の一方の端部の先端から折れ曲がって延設する張出し継手部とからなり、該張出し継手部と、前記コの字状本体部の他方の端部とを接合することで、複数の前記加工鉄筋が四角形の螺旋形状に連続するようになっており、四角形の螺旋形状の各３層の螺旋において、前記張出し継手部と前記他方の端部との接合部は、前記既設コンクリート構造物の四角形の断面形状の異なる４箇所の角部に順次配置されるようになっている巻立て鉄筋を提供することにより、上記目的を達成したものである。 In the present invention, when a reinforcing body that reinforces an existing concrete structure having a square cross-sectional shape is formed around the existing concrete structure, it is installed in a square spiral shape along the outer peripheral surface of the existing concrete structure. A plurality of bent rebars that are bent and joined to the existing concrete structure by joining the end portions thereof to form a rectangular spiral shape. The U-shaped main body having two bent corners so that the processed rebar has a U-shape along three sides of the square cross-sectional shape of the existing concrete structure. And an overhanging joint portion that is bent and extends from the tip of one end of the U-shaped main body, and the overhanging joint and the other end of the U-shaped main body Joining A plurality of the processed reinforcing bars are arranged in a rectangular spiral shape, and in each of the three spiral layers of the rectangular spiral shape, the joint portion between the overhang joint portion and the other end portion is the existing The above object is achieved by providing a wound reinforcing bar that is arranged sequentially at four corners of a concrete structure having a quadrangular cross-sectional shape different from each other.

本発明の巻立て鉄筋は、前記張出し継手部と前記コの字状本体部の他方の端部との接合部が、溶接による接合部となっていることが好ましい。 In the wound reinforcing bar of the present invention, it is preferable that a joint portion between the overhang joint portion and the other end portion of the U-shaped main body portion is a joint portion by welding.

また、本発明の巻立て鉄筋は、前記張出し継手部と前記コの字状本体部の他方の端部との接合部が、機械式継手による接合部となっていることが好ましい。 In the wound reinforcing bar of the present invention, it is preferable that a joint portion between the overhang joint portion and the other end portion of the U-shaped main body portion is a joint portion by a mechanical joint.

そして、本発明の巻立て鉄筋は、前記既設コンクリート構造物が正方形又は略正方形の断面形状を有しており、螺旋形状を形成する複数の前記加工鉄筋は、前記コの字状本体部の各辺部が、前記正方形又は略正方形の断面形状の各辺部と対応する、同じか又は略同じ長さとなった１種類の加工鉄筋によって構成されていることが好ましい。 In the wound reinforcing bar of the present invention, the existing concrete structure has a square or substantially square cross-sectional shape, and the plurality of processed reinforcing bars forming a spiral shape are each of the U-shaped main body portions. It is preferable that the side portion is constituted by one type of processed reinforcing bar having the same or substantially the same length corresponding to each side portion of the square or substantially square cross-sectional shape.

また、本発明の巻立て鉄筋は、前記既設コンクリート構造物が長方形の断面形状を有しており、複数の前記加工鉄筋は、前記コの字状本体部の一対の対向辺が前記長方形の断面形状の長辺に対応する長さを備えると共に、中間辺が前記長方形の断面形状の短辺に対応する長さを有する第１加工鉄筋と、前記コの字状本体部の一対の対向辺が前記長方形の断面形状の短辺に対応する長さを備えると共に、中間辺が前記長方形の断面形状の長辺に対応する長さを有する第２加工鉄筋との２種類の加工鉄筋によって構成されていることが好ましい。 In the wound reinforcing bar of the present invention, the existing concrete structure has a rectangular cross-sectional shape, and the plurality of processed reinforcing bars have a rectangular cross-section with a pair of opposite sides of the U-shaped main body portion. A first processed reinforcing bar having a length corresponding to the long side of the shape and having a middle side having a length corresponding to the short side of the rectangular cross-sectional shape, and a pair of opposing sides of the U-shaped main body portion. It has a length corresponding to the short side of the rectangular cross-sectional shape, and the intermediate side is constituted by two types of processed rebars with a second processed rebar having a length corresponding to the long side of the rectangular cross-sectional shape. Preferably it is.

さらに、本発明の巻立て鉄筋は、前記既設コンクリート構造物が、四角形の断面形状を有するコンクリート柱であることが好ましい。 Furthermore, in the wound reinforcing bar of the present invention, it is preferable that the existing concrete structure is a concrete column having a square cross-sectional shape.

また、本発明は、上記巻立て鉄筋に用いる加工鉄筋であって、前記既設コンクリート構造物の四角形の断面形状の３つの辺部に沿ったコの字形状となるように、折れ曲がった２箇所の角部を備えるコの字状本体部と、該コの字状本体部の一方の端部の先端から折れ曲がって延設する張出し継手部とからなり、該張出し継手部と、前記コの字状本体部の他方の端部とが接合されることで、四角形の螺旋形状に連続する前記巻立て鉄筋が形成される加工鉄筋を提供することにより、上記目的を達成したものである。 Further, the present invention is a processed reinforcing bar used for the above-described wound reinforcing bar, and two bent portions are formed so as to be U-shaped along three sides of the square cross-sectional shape of the existing concrete structure. A U-shaped main body portion having a corner portion, and an overhanging joint portion that is bent and extends from the tip of one end of the U-shaped main body portion. The object is achieved by providing a processed reinforcing bar in which the wound reinforcing bar that is continuous in a rectangular spiral shape is formed by joining the other end of the main body part.

本発明の巻立て鉄筋、又は該巻立て鉄筋に用いる加工鉄筋によれば、入手が容易で安価な一般の鉄筋を使用して、専用の機械を用いることなく、四角形の断面形状を有する既設コンクリート構造物の外周面に沿って、補強用の鉄筋を所定のピッチで効率良く設置してゆくことができる。 According to the wound reinforcing bar of the present invention or the processed reinforcing bar used for the wound reinforcing bar, the existing concrete having a square cross-sectional shape can be obtained without using a dedicated machine by using an easily available and inexpensive general reinforcing bar. Reinforcing bars can be efficiently installed at a predetermined pitch along the outer peripheral surface of the structure.

本発明の好ましい一実施形態に係る巻立て鉄筋を用いて既設コンクリート構造物の周囲に形成される補強体の構成を説明する、一部を切り欠いて示す略示斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view illustrating a configuration of a reinforcing body formed around an existing concrete structure using a wound reinforcing bar according to a preferred embodiment of the present invention, with a part cut away. （ａ）〜（ｄ）は、巻立て鉄筋に用いる加工鉄筋の説明図である。(A)-(d) is explanatory drawing of the processing reinforcement used for a winding reinforcement. （ａ）は本発明の好ましい一実施形態に係る巻立て鉄筋の構成を説明する略示斜視図、（ｂ）は加工鉄筋を螺旋形状に連続させてゆく状況の説明図である。(A) is a schematic perspective view explaining the structure of the wound reinforcing bar which concerns on preferable one Embodiment of this invention, (b) is explanatory drawing of the condition which makes a process reinforcing bar continue in a helical shape. （ａ）〜（ｄ）は、既設コンクリート構造物の周囲に補強体を形成する工程の説明図である。(A)-(d) is explanatory drawing of the process of forming a reinforcement body around the existing concrete structure. （ａ）〜（ｄ）は、既設コンクリート構造物の周囲に補強体を形成する工程の説明図である。(A)-(d) is explanatory drawing of the process of forming a reinforcement body around the existing concrete structure. （ａ）〜（ｄ）は、他の実施形態に係る巻立て鉄筋に用いる加工鉄筋の説明図である。(A)-(d) is explanatory drawing of the process reinforcement used for the winding reinforcement which concerns on other embodiment. 張出し継手部とコの字状本体部の他方の端部との機械式継手による接合部の説明図である。It is explanatory drawing of the junction part by a mechanical joint with an overhanging joint part and the other edge part of a U-shaped main-body part. 張出し継手部とコの字状本体部の他方の端部との機械式継手による接合部の正面図である。It is a front view of the junction part by a mechanical joint with an overhanging joint part and the other edge part of a U-shaped main-body part.

本発明の好ましい一実施形態に係る巻立て鉄筋１０は、図１に示すように、補強すべき四角形の断面形状を有する既設コンクリート構造物として、例えば高架橋の基礎フーチング２１と橋台２２との間の橋脚部分を構成するコンクリート柱２０を耐震補強する際に、コンクリート柱２０の上下方向の略全長に亘る外周面に沿って、四角形の螺旋形状に連続して設置されて用いられる。本実施形態では、コンクリート柱２０を耐震補強するための補強体１１は、コンクリート柱２０の外周面に沿って巻立て鉄筋１０を設置した後に、巻立て鉄筋１０の外側に金網１２を取り付け、さらに巻立て鉄筋１０及び金網１２を埋設するようにして、吹付けモルタル１３を例えば５０〜１００ｍｍ程度の所定の厚さで吹き付けて固化させることで形成されるようになっている。 As shown in FIG. 1, a wound reinforcing bar 10 according to a preferred embodiment of the present invention is an existing concrete structure having a square cross-sectional shape to be reinforced, for example, between a viaduct foundation footing 21 and an abutment 22. When the concrete pillar 20 constituting the pier part is seismically reinforced, the concrete pillar 20 is continuously installed and used in a rectangular spiral shape along the outer peripheral surface over the substantially entire length of the concrete pillar 20 in the vertical direction. In the present embodiment, the reinforcing body 11 for seismic reinforcement of the concrete column 20 is provided with a wire mesh 12 attached to the outside of the wound reinforcing bar 10 after the wound reinforcing bar 10 is installed along the outer peripheral surface of the concrete column 20. The winding rebar 10 and the wire mesh 12 are embedded, and the spraying mortar 13 is formed by spraying and solidifying the spraying mortar 13 with a predetermined thickness of, for example, about 50 to 100 mm.

そして、本実施形態の巻立て鉄筋１０は、図２〜図４にも示すように、四角形の断面形状を備えるコンクリート柱２０を補強する補強体１１をコンクリート柱２０の周囲に形成する際に、コンクリート柱２０の外周面に沿って四角形の螺旋形状に設置される鉄筋であって、折曲げ加工された複数の加工鉄筋１４を、これらの端部１４ｂ，１４ｃを接合して四角形の螺旋形状に連続させることによってコンクリート柱２０の周囲に設置されるようになっており、加工鉄筋１４は、コンクリート柱２０の四角形の断面形状の３つの辺部２０ｅに沿ったコの字形状となるように、折れ曲がった２箇所の角部１４ｄを備えるコの字状本体部１４ａと、コの字状本体部１４ａの一方の端部の先端から折れ曲がって延設する張出し継手部１４ｂとからなり（図２参照）、張出し継手部（加工鉄筋の端部）１４ｂと、コの字状本体部１４ａの他方の端部（加工鉄筋の端部）１４ｃとを好ましくは溶接によって接合することで、複数の前記加工鉄筋１４が四角形の螺旋形状に連続するようになっており、四角形の螺旋形状の各３層の螺旋において、張出し継手部１４ｂとコの字状本体部１４ａの他方の端部１４ｃとの接合部１５は、コンクリート柱２０の四角形の断面形状の異なる４箇所の角部２０ａ，２０ｂ，２０ｃ，２０ｄ（図２参照）に順次配置されるようになっている。 And, as shown in FIGS. 2 to 4, the wound reinforcing bar 10 of the present embodiment, when forming the reinforcing body 11 that reinforces the concrete column 20 having a square cross-sectional shape around the concrete column 20, Reinforcing bars installed in a rectangular spiral shape along the outer peripheral surface of the concrete pillar 20, a plurality of bent reinforcing bars 14 are joined to their end portions 14b and 14c to form a rectangular spiral shape. It is designed to be installed around the concrete pillar 20 by being continuous, and the processed rebar 14 has a U-shape along the three sides 20e of the square cross-sectional shape of the concrete pillar 20. It comprises a U-shaped main body portion 14a having two bent corner portions 14d, and an overhanging joint portion 14b extending from the tip of one end of the U-shaped main body portion 14a. 2), an overhang joint portion (an end portion of the processed rebar) 14b and the other end portion (the end portion of the processed rebar) 14c of the U-shaped main body portion 14a are preferably joined by welding. In the three-layered spiral of each of the quadrangular spiral shapes, the processed rebar 14 of the quadrangular spiral shape is continuous with the overhang joint portion 14b and the other end portion 14c of the U-shaped main body portion 14a. These joint portions 15 are sequentially arranged at four corner portions 20a, 20b, 20c, and 20d (see FIG. 2) having different quadrangular cross-sectional shapes of the concrete pillars 20.

また、本実施形態では、コンクリート柱２０は、正方形又は略正方形の断面形状を有しており、螺旋形状を形成する複数の加工鉄筋１４は、コの字状本体部１４ａの各辺部１４ｅが、コンクリート柱２０の正方形又は略正方形の断面形状の各辺部２０ｅと対応する、略同じ長さとなった１種類の加工鉄筋１４によって構成されている。 Moreover, in this embodiment, the concrete pillar 20 has a square or substantially square cross-sectional shape, and the plurality of processed rebars 14 forming a spiral shape have each side portion 14e of the U-shaped main body portion 14a. The concrete pillar 20 is composed of one type of processed reinforcing bar 14 corresponding to each side portion 20e having a square or substantially square cross-sectional shape and having substantially the same length.

本実施形態では、補強体１１によって耐震補強されるコンクリート柱２０は、上述のように、高架橋の基礎フーチング２１と、橋台２２との間の橋脚部分を構成するものであり、好ましくは４箇所の角部２０ａ，２０ｂ，２０ｃ，２０ｄが斜めに面取りされた、一辺の長さが例えば５００〜２０００ｍｍ程度の大きさの正方形又は略正方形の断面形状を備えている。コンクリート柱２０の外周部分には、これの外周面に沿って、巻立て鉄筋１０が、当該外周面との間に例えば５〜３０ｍｍ程度の間隔をおいた状態で、上下方向に例えば例えば２０〜２００ｍｍ程度の螺旋ピッチで複数層に配筋されて、四角形の螺旋形状に設置される。 In this embodiment, the concrete pillar 20 seismically reinforced by the reinforcing body 11 constitutes the pier portion between the viaduct foundation footing 21 and the abutment 22 as described above, and preferably four locations. The corners 20a, 20b, 20c, and 20d are chamfered diagonally, and each side has a square or substantially square cross-sectional shape with a length of, for example, about 500 to 2000 mm. In the outer peripheral portion of the concrete column 20, the wound reinforcing bar 10 is, for example, 20 to 20 in the vertical direction with an interval of, for example, about 5 to 30 mm between the outer peripheral surface and the outer peripheral surface. The bars are arranged in a plurality of layers at a spiral pitch of about 200 mm and installed in a square spiral shape.

本実施形態では、巻立て鉄筋１０は、複数の加工鉄筋１４を施工現場で連続させて四角形の螺旋形状に設置される。加工鉄筋１４は、上述のように、コンクリート柱２０の四角形の断面形状の３つの辺部２０ｅに沿ったコの字形状となるように、直角又は略直角に折れ曲がった２箇所の角部１４ｄを備えるコの字状本体部１４ａと、コの字状本体部１４ａの一方の端部の先端から直角又は略直角に折れ曲がって延設する張出し継手部１４ｂとからなり、張出し継手部１４ｂと、コの字状本体部１４ａの他方の端部１４ｃとが、接合部１５において好ましくはフレア溶接等の溶接によって接合されることで、四角形の螺旋形状に連続する巻立て鉄筋１０が形成される。 In the present embodiment, the wound reinforcing bar 10 is installed in a rectangular spiral shape by connecting a plurality of processed reinforcing bars 14 at a construction site. As described above, the processed rebar 14 has two corner portions 14d bent at a right angle or a substantially right angle so as to have a U shape along the three side portions 20e of the quadrangular cross-sectional shape of the concrete column 20. The U-shaped main body portion 14a and the overhanging joint portion 14b that bends and extends from the tip of one end of the U-shaped main body portion 14a at a right angle or a substantially right angle. The other end portion 14c of the U-shaped main body portion 14a is joined at the joining portion 15 by welding such as flare welding, so that the wound reinforcing bar 10 that is continuous in a rectangular spiral shape is formed.

加工鉄筋１４は、例えば鉄筋径ｄが１０〜２２ｍｍ程度の太さの一般に用いられる異形鉄筋を、当該施工現場や専用の鉄筋加工場等において加工することにより、コンクリート柱２０の正方形又は略正方形の断面形状の各辺部２０ｅと対応する、例えば５２０〜２１００ｍｍ程度の長さの３つの辺部１４ｅを備えるコの字状本体部１４ａと、コの字状本体部１４ａの一方の端部の先端から角部１４ｄ’を介して直角又は略直角に折れ曲がって延設する、好ましくは鉄筋径ｄの１０倍以上の溶接（継手）長さとして、例えば１００〜２２０ｍｍ程度の溶接（継手）長さを有する張出し継手部１４ｂとからなる形状に形成される（図２（ａ）〜（ｄ）参照）。 The processed reinforcing bar 14 is formed by processing a generally used deformed reinforcing bar having a diameter of about 10 to 22 mm, for example, at the construction site or a dedicated reinforcing bar processing site. A U-shaped main body portion 14a having three side portions 14e having a length of about 520 to 2100 mm, for example, corresponding to each side portion 20e of the cross-sectional shape, and a tip of one end portion of the U-shaped main body portion 14a As a weld (joint) length that is bent at a right angle or substantially at a right angle through the corner portion 14d ', and preferably 10 times or more the rebar diameter d, a weld (joint) length of, for example, about 100 to 220 mm is used. It forms in the shape which consists of the overhanging joint part 14b which has (refer Fig.2 (a)-(d)).

また、本実施形態では、加工鉄筋１４のコの字状本体部１４ａの２箇所の角部１４ｄ、及びコの字状本体部１４ａの一方の端部と張出し継手部１４ｂとの１箇所の角部１４ｄ’は、湾曲Ｒ部を介して直角又は略直角に折れ曲がっている。さらに、加工鉄筋１４は、コンクリート柱２０の外周面に沿って配置された際に、図３（ｂ）に示すように、コの字状本体部１４ａ（加工鉄筋１４）の他方の端部１４ｃよりも、張出し継手部１４ｂによる加工鉄筋１４の一方の端部の方が、巻立て鉄筋１０の螺旋ピッチの略３／４程度の高低差で高い位置に配置されるように、立体形状に形成されている。 Moreover, in this embodiment, the corner | angular part 14d of two places of the U-shaped main-body part 14a of the process reinforcement 14 and one corner | angular part of one edge part of the U-shaped main-body part 14a and the overhanging joint part 14b are carried out. The portion 14d ′ is bent at a right angle or a substantially right angle via the curved R portion. Further, when the processed rebar 14 is disposed along the outer peripheral surface of the concrete column 20, as shown in FIG. 3B, the other end 14c of the U-shaped main body 14a (processed rebar 14). Instead, one end of the processed rebar 14 by the overhang joint 14b is formed in a three-dimensional shape so that it is arranged at a higher position with a height difference of about 3/4 of the helical pitch of the hoisting rebar 10. Has been.

そして、本実施形態では、巻立て鉄筋１０は、上述のように折曲げ加工された複数の加工鉄筋１４を、コンクリート柱２０の外周部分に各々装着すると共に、これらの端部１４ｂ，１４ｃを接合して四角形の螺旋形状に連続させることによって容易に形成することができる。また、図３（ａ），（ｂ）及び図２（ａ）〜（ｄ）に示すように、巻立て鉄筋１０の螺旋形状の各３層の螺旋において、張出し継手部１４ｂとコの字状本体部１４ａの他方の端部１４ｃとの接合部１５は、コンクリート柱２０の四角形の断面形状の、異なる４箇所の角部２０ａ，２０ｂ，２０ｃ，２０ｄに順次配置されることになる。 In the present embodiment, the wound reinforcing bar 10 has the plurality of processed reinforcing bars 14 bent as described above attached to the outer peripheral portion of the concrete column 20, and the ends 14b and 14c are joined. And it can form easily by making it continue in a rectangular spiral shape. Further, as shown in FIGS. 3A and 3B and FIGS. 2A to 2D, in the spiral of each of the three layers of the spiral shape of the wound reinforcing bar 10, the overhang joint portion 14b and a U-shape are formed. The joint portion 15 with the other end portion 14c of the main body portion 14a is sequentially arranged at four different corner portions 20a, 20b, 20c, and 20d having a quadrangular cross-sectional shape of the concrete column 20.

すなわち、本実施形態では、複数の加工鉄筋１４は、各々、コの字状本体部１４ａと、コの字状本体部１４ａの一方の端部の先端から直角又は略直角に折れ曲がって僅かに延設する張出し継手部１４ｂとからなる、四角形の一辺部の略全体が開放されたコの字形状を備えており、加工鉄筋１４を弾性変形させつつ張出し継手部１４とコの字状本体部１４ａの他方の端部１４ｃとの間隔を例えば手作業によって僅かに拡げるだけで、これらの間にコンクリート柱２０の各辺部１４ｅの長さ（幅）よりも広い間隔を容易に保持できるので、各加工鉄筋１４を、僅かな弾性変形で十分に拡げられた当該間隔部分を介して、コンクリート柱２０の外周部分に各々スムーズに装着することが可能になる。 That is, in this embodiment, each of the plurality of processed reinforcing bars 14 is bent at a right angle or a substantially right angle from the tip of the U-shaped main body portion 14a and one end of the U-shaped main body portion 14a and slightly extends. It is provided with a U-shape that is formed by an overhang joint portion 14b to be opened and substantially the entire one side portion of the quadrangle is opened, and the overhang joint portion 14 and the U-shape main body portion 14a while elastically deforming the processed rebar 14. Since the distance between the other end portion 14c of the concrete column 20 can be slightly widened by hand, for example, a space wider than the length (width) of each side portion 14e of the concrete column 20 can be easily held between them. The processed rebar 14 can be smoothly attached to the outer peripheral portion of the concrete column 20 through the space portion sufficiently expanded by slight elastic deformation.

ここで、加工鉄筋１４を構成する、鉄筋径ｄが１０〜２２ｍｍ程度の太さの異形鉄筋は、高強度鋼線と比較して弾性変形し難い材料であるが、加工鉄筋１４は、４角形の一辺部の略全体が開放されたコの字形状を備えており、張出し継手部１４ｂとコの字状本体部１４ａの他方の端部１４ｃとの間隔を手作業によって拡げる程度の弾性変形は容易であるため、コンクリート柱２０の外周部分に装着するために十分に拡げられたこれらの間の間隔部分を介して、各加工鉄筋１４を、コンクリート柱２０の外周部分に各々スムーズに装着することが可能になる。 Here, the deformed reinforcing bar having the thickness of the reinforcing bar diameter d of about 10 to 22 mm that constitutes the processed reinforcing bar 14 is a material that is not easily elastically deformed as compared with the high-strength steel wire. Elastically deformed to such an extent that the distance between the extended joint portion 14b and the other end portion 14c of the U-shaped main body portion 14a is increased manually. Since it is easy, each processed rebar 14 is smoothly attached to the outer peripheral portion of the concrete column 20 through a space portion between them that is sufficiently widened to be attached to the outer peripheral portion of the concrete column 20. Is possible.

また、巻立て鉄筋１０の螺旋形状の各３層の螺旋において、例えば最下部に配置される加工鉄筋１４の他方の端部１４ｃをコンクリート柱２０の第１角部２０ａに配置すれば、図２（ａ）及び図３（ｂ）に示すように、コの字状本体部１４ａの各辺部１４ｅは、コンクリート柱２０の３つの辺部２０ｅに沿って配置されると共に、加工鉄筋１４の張出し継手部１４は、コンクリート柱２０の第４角部２０ｄに配置されることになる。次に、図２（ａ），（ｂ）及び図３（ｂ）に示すように、最下部から２番目の加工鉄筋１４の他方の端部１４ｃを、コンクリート柱２０の第４角部２０ｄに配置された最下部の加工鉄筋１４の張出し継手部１４ｂに重ね合わせるようにして、当該第４角部２０ｄに配置すると共に、コの字状本体部１４ａの各辺部１４ｅを、コンクリート柱２０の３つの辺部２０ｅに沿って配置して、２番目の加工鉄筋１４の張出し継手部１４ｂを、コンクリート柱２０の第３角部２０ｃに配置する。この状態で、第４角部２０ｄに重ねて配置された、最下部の加工鉄筋１４の張出し継手部１４ｂと２番目の加工鉄筋１４の他方の端部１４ｃとを溶接して接合部１５を形成することにより、最下部の加工鉄筋１４と２番目の加工鉄筋１４とが連続する。 Further, in the spiral of each of the three layers in the spiral shape of the wound reinforcing bar 10, for example, if the other end portion 14c of the processed reinforcing bar 14 disposed at the lowermost portion is disposed at the first corner 20a of the concrete column 20, FIG. As shown to (a) and FIG.3 (b), while each side part 14e of the U-shaped main-body part 14a is arrange | positioned along the three side parts 20e of the concrete pillar 20, the overhang | projection of the processed rebar 14 is carried out. The joint portion 14 is disposed at the fourth corner portion 20d of the concrete column 20. Next, as shown in FIGS. 2A, 2 </ b> B, and 3 </ b> B, the other end 14 c of the second processed rebar 14 from the bottom is connected to the fourth corner 20 d of the concrete column 20. It arrange | positions in the said 4th corner | angular part 20d so that it may overlap with the overhang | projection joint part 14b of the arrangement | positioning lowermost process reinforcement 14, and each side part 14e of the U-shaped main-body part 14a is made into the concrete pillar 20's. Arranged along the three side portions 20 e, the overhang joint portion 14 b of the second processed reinforcing bar 14 is arranged at the third corner portion 20 c of the concrete column 20. In this state, the joint portion 15 is formed by welding the overhang joint portion 14b of the lowermost processed rebar 14 and the other end portion 14c of the second processed rebar 14 that are arranged to overlap the fourth corner portion 20d. By doing so, the lowermost processed rebar 14 and the second processed rebar 14 are continuous.

さらに、図２（ｂ），（ｃ）及び図３（ｂ）に示すように、最下部から３番目の加工鉄筋１４の他方の端部１４ｃを、コンクリート柱２０の第３角部２０ｃに配置された２番目の加工鉄筋１４の張出し継手部１４ｂに重ね合わせるようにして、当該第３角部２０ｃに配置すると共に、コの字状本体部１４ａの各辺部１４ｅを、コンクリート柱２０の３つの辺部２０ｅに沿って配置して、３番目の加工鉄筋１４の張出し継手部１４ｂを、コンクリート柱２０の第２角部２０ｂに配置する。この状態で、第３角部２０ｃに重ねて配置された、２番目の加工鉄筋１４の張出し継手部１４ｂと３番目の加工鉄筋１４の他方の端部１４ｃとを溶接して接合部１５を形成することにより、２番目の加工鉄筋１４と３番目の加工鉄筋１４とが連続する。 Further, as shown in FIGS. 2 (b), 2 (c) and FIG. 3 (b), the other end portion 14 c of the third processed rebar 14 from the bottom is arranged at the third corner portion 20 c of the concrete column 20. It is arranged on the third corner portion 20c so as to overlap with the overhang joint portion 14b of the second processed reinforcing bar 14, and each side portion 14e of the U-shaped main body portion 14a is connected to 3 of the concrete column 20. It arrange | positions along the one side part 20e, and the overhanging joint part 14b of the 3rd process reinforcement 14 is arrange | positioned in the 2nd corner | angular part 20b of the concrete pillar 20. FIG. In this state, the joint 15 is formed by welding the overhanging joint portion 14b of the second processed rebar 14 and the other end portion 14c of the third processed rebar 14 that are arranged so as to overlap the third corner portion 20c. By doing so, the 2nd processing reinforcement 14 and the 3rd processing reinforcement 14 continue.

さらにまた、図２（ｃ），（ｄ）及び図３（ｂ）に示すように、最下部から４番目（最上部）の加工鉄筋１４の他方の端部１４ｃを、コンクリート柱２０の第２角部２０ｂに配置された３番目の加工鉄筋１４の張出し継手部１４ｂに重ね合わせるようにして、当該第２角部２０ｂに配置すると共に、コの字状本体部１４ａの各辺部１４ｅを、コンクリート柱２０の３つの辺部２０ｅに沿って配置して、４番目の加工鉄筋１４の張出し継手部１４ｂを、コンクリート柱２０の第１角部２０ａに配置する。この状態で、第２角部２０ｂに重ねて配置された、３番目の加工鉄筋１４の張出し継手部１４ｂと４番目の加工鉄筋１４の他方の端部１４ｃとを溶接して接合部１５を形成することにより、３番目の加工鉄筋１４と４番目の加工鉄筋１４とが連続する。 Furthermore, as shown in FIGS. 2 (c), 2 (d) and FIG. 3 (b), the other end 14 c of the fourth (uppermost) processed reinforcing bar 14 from the lowermost portion is connected to the second end of the concrete column 20. While being arranged on the second corner portion 20b so as to overlap with the overhang joint portion 14b of the third processed reinforcing bar 14 arranged at the corner portion 20b, each side portion 14e of the U-shaped main body portion 14a, Arranged along the three sides 20 e of the concrete column 20, the overhang joint portion 14 b of the fourth processed rebar 14 is arranged at the first corner portion 20 a of the concrete column 20. In this state, the joint 15 is formed by welding the overhanging joint portion 14b of the third processed rebar 14 and the other end portion 14c of the fourth processed rebar 14 that are arranged to overlap the second corner portion 20b. By doing so, the 3rd processing bar 14 and the 4th processing bar 14 continue.

引き続いて、図２（ｄ），（ａ）に示すように、上方の３層の螺旋の最下部の加工鉄筋１４の他方の端部１４ｃを、コンクリート柱２０の第１角部２０ａに配置された４番目の加工鉄筋１４の張出し継手部１４ｂに重ね合わせるようにして、当該第１角部２０ａに配置すると共に、コの字状本体部１４ａの各辺部１４ｅを、コンクリート柱２０の３つの辺部２０ｅに沿って配置して、４番目の加工鉄筋１４の張出し継手部１４ｂを、コンクリート柱２０の第４角部２０ｄに配置する。この状態で、第１角部２０ａに重ねて配置された、４番目の加工鉄筋１４の張出し継手部１４ｂと上方の螺旋の最下部の加工鉄筋１４の他方の端部１４ｃとを溶接して接合部１５を形成することにより、４番目の加工鉄筋１４と上方の螺旋の最下部の加工鉄筋１４とが連続する。 Subsequently, as shown in FIGS. 2 (d) and 2 (a), the other end portion 14 c of the lowermost processing rebar 14 of the upper three-layer spiral is arranged at the first corner portion 20 a of the concrete column 20. In addition, it is arranged on the first corner portion 20a so as to overlap with the overhang joint portion 14b of the fourth processed rebar 14 and each side portion 14e of the U-shaped main body portion 14a is attached to three concrete pillars 20 Arranged along the side portion 20 e, the overhang joint portion 14 b of the fourth processed reinforcing bar 14 is arranged at the fourth corner portion 20 d of the concrete column 20. In this state, the overhang joint portion 14b of the fourth processed rebar 14 and the other end portion 14c of the lowermost processed rebar 14 of the upper spiral, which are arranged to overlap the first corner portion 20a, are welded and joined. By forming the portion 15, the fourth machining rebar 14 and the lowermost machining rebar 14 of the upper spiral are continuous.

同様の作業を繰り返すことで、４本の加工鉄筋１４による螺旋形状の各３層の螺旋において、張出し継手部１４ｂとコの字状本体部１４ａの他方の端部との接合部１５が、コンクリート柱２０の異なる４箇所の角部２０ａ，２０ｂ，２０ｃ，２０ｄに順次配置されて巻立てられた、本実施形態の巻立て鉄筋１０が、コンクリート柱２０の外周面に沿って四角形の螺旋形状に連続した状態で容易に設置されることになる。 By repeating the same operation, the joint 15 between the overhang joint portion 14b and the other end portion of the U-shaped main body portion 14a in the spiral of each of the three layers of the spiral shape by the four processed reinforcing bars 14 is made of concrete. The wound reinforcing bar 10 of the present embodiment, which is sequentially disposed and wound around four different corners 20 a, 20 b, 20 c, 20 d of the column 20, has a rectangular spiral shape along the outer peripheral surface of the concrete column 20. It will be easily installed in a continuous state.

上述の構成を備える本実施形態の巻立て鉄筋１０をコンクリート柱２０の外周部分に取り付けて、コンクリート柱２０を耐震補強するための補強体１１を形成するには、例えば図４（ａ）に示すように、まず準備工として、既設のコンクリート柱２０である高架橋の橋脚部分から、雨樋２９等の障害物を撤去すると共に、施工現場の作業ヤードの周囲に仮囲い２３を設置する。しかる後に、図４（ｂ）に示すように、仮設工として、地中部分のコンクリート柱２０も補強できるように、基礎フーチング２１の周囲を囲んで土留２５を設置すると共に、土留２５の内側の地盤を基礎フーチング２１が現れるまで掘削する。また、基礎フーチング２１や土留２５の周囲の地盤に支持させて、足場２４を組み立てて設置すると共に、作業ヤードに吹付けプラントを設置する。 In order to form the reinforcing body 11 for attaching the wound reinforcing bar 10 of the present embodiment having the above-described configuration to the outer peripheral portion of the concrete column 20 and reinforcing the concrete column 20 with earthquake resistance, for example, as shown in FIG. Thus, as a preparatory work, obstacles such as the rain gutter 29 are removed from the viaduct pier portion of the existing concrete pillar 20 and a temporary enclosure 23 is installed around the work yard at the construction site. After that, as shown in FIG. 4 (b), as a temporary work, a soil retaining wall 25 is set around the foundation footing 21 so that the concrete column 20 in the underground portion can be reinforced, Excavate the ground until the foundation footing 21 appears. In addition, the scaffold 24 is assembled and installed on the ground around the foundation footing 21 and the retaining ring 25, and a spraying plant is installed in the work yard.

さらに、図４（ｃ）に示すように、表面処理工として、コンクリート柱２０の欠損部２６の断面補強や、欠損部２６において露出する鉄筋の防錆・補強を行うと共に、コンクリート柱２０の表面のケレンや清掃を行った後に、本実施形態の巻立て鉄筋１０の組立作業を行う。 Further, as shown in FIG. 4C, as a surface treatment work, the cross-section reinforcement of the defect portion 26 of the concrete column 20, the rust prevention / reinforcement of the reinforcing bars exposed at the defect portion 26, and the surface of the concrete column 20 are performed. After carrying out the cleaning and cleaning, the assembling work of the wound reinforcing bar 10 of this embodiment is performed.

巻立て鉄筋１０の組立作業は、図４（ｄ）に示すように、例えば段取り筋２７や剥落防止アンカー２８をコンクリート柱２０に取り付けた後に、作業ヤードに搬入されて基礎フーチング２１や足場２４の上に仮置きされた加工鉄筋１４を、上述のようにしてコンクリート柱２０の下部から上部に向って作業員の手によって一本づつ配筋し、仮固定しながら組み立て行く。 As shown in FIG. 4 (d), the winding rebar 10 is assembled by, for example, attaching the setup bar 27 or the peeling prevention anchor 28 to the concrete pillar 20 and then carrying it into the work yard to check the foundation footing 21 and the scaffold 24. The processed reinforcing bars 14 temporarily placed thereon are arranged one by one by the hand of the worker from the lower part to the upper part of the concrete pillar 20 as described above, and assembled while temporarily fixing.

また、図５（ａ）に示すように、コンクリート柱２０の下部から上部に至るまで、コンクリート柱２０の略全長に亘って複数の加工鉄筋１４を組み立てたら、重ね合わせた加工鉄筋１４の一方の端部の張出し継手部１４ｂと他方の端部１４ｃとの各接合部１５に（図３参照）、好ましくはフレア溶接を施すことにより、コンクリート柱２０の外周部分に、複数の加工鉄筋１４が四角形の螺旋形状に連続する本実施形態の巻立て鉄筋１０が形成されることになる。 Moreover, as shown to Fig.5 (a), when the some process reinforcement 14 is assembled over the substantially full length of the concrete pillar 20 from the lower part to the upper part of the concrete pillar 20, one side of the piled process reinforcement 14 will be shown. A plurality of processed rebars 14 are squarely formed on the outer peripheral portion of the concrete column 20 by performing flare welding on each joint portion 15 (see FIG. 3) between the end joint portion 14b and the other end portion 14c. Thus, the wound reinforcing bar 10 of the present embodiment that is continuous in the spiral shape is formed.

コンクリート柱２０の外周部分に巻立て鉄筋１０を設置したら、図５（ｂ）に示すように、設置した巻立て鉄筋１０の外側を覆って吹付け面の全面に金網１２を取り付けた後に、吹付けモルタル１３の吹付け工を行う。吹付けモルタル１３の吹付け工は、例えば金網１２が隠れるまで一次吹付け（下吹き）を行った後に、翌日に二次吹付け（上吹き）を行って、表面仕上げを施工する。 When the wound reinforcing bar 10 is installed on the outer peripheral portion of the concrete column 20, as shown in FIG. 5B, the wire mesh 12 is attached to the entire surface of the sprayed surface so as to cover the outer side of the installed wound reinforcing bar 10, and Spraying of the mortar 13 is performed. For example, the spraying mortar 13 performs primary spraying (lower spraying) until the wire mesh 12 is hidden, and then performs secondary spraying (upper spraying) on the next day to perform surface finishing.

二次吹付け（上吹き）の後に表面仕上げを行ったら、図５（ｃ）に示すように、例えば二次吹付けの翌日に、仕上げた吹付けモルタル１３の表面に養生ラップ３０を巻き付けて、表面ラップ養生を行う。所定の養生期間が経過したら、図５（ｄ）に示すように、養生ラップ３０を撤去すると共に、出来形検査を行い、さらに足場２４の解体、埋戻し、土留２５の撤去、雨樋２９等の障害物の復旧、作業ヤードの片付け、仮囲い２３の撤去等の作業を行って、コンクリート柱２０を耐震補強するための補強体１１の構築作業が終了する。 When the surface finish is performed after the secondary spraying (upper spraying), as shown in FIG. 5C, for example, the curing wrap 30 is wound around the surface of the finished spraying mortar 13 on the day after the secondary spraying. Perform surface wrap curing. When the predetermined curing period has elapsed, as shown in FIG. 5 (d), the curing wrap 30 is removed, and the finished shape inspection is performed, and the scaffold 24 is dismantled, backfilled, the earth retaining 25 is removed, the gutter 29, etc. The construction work of the reinforcing body 11 for the seismic reinforcement of the concrete pillar 20 is completed by performing the work such as restoration of obstacles, cleaning up the work yard, and removing the temporary enclosure 23.

そして、上述の構成を備える本実施形態の巻立て鉄筋１０によれば、入手が容易で安価な一般の異形鉄筋を使用して、専用の機械を用いることなく、四角形の断面形状を有する既設のコンクリート柱２０の外周面に沿って、補強用の鉄筋を所定のピッチで効率良く設置してゆくことができる。 And according to the rolled reinforcing bar 10 of this embodiment provided with the above-mentioned structure, it is possible to use an existing deformed reinforcing bar that is easily available and inexpensive, and has an existing cross-sectional shape without using a dedicated machine. A reinforcing bar can be efficiently installed at a predetermined pitch along the outer peripheral surface of the concrete column 20.

すなわち、本実施形態によれば、巻立て鉄筋１０は、一般の異形鉄筋を用いて加工された、コの字状本体部１４ａと張出し継手部１４ｂとかなる加工鉄筋１４を、一本一本コンクリート柱２０の外周部分に装着して、専用の機械を用いることなく、作業員の手作業によって安価に取り付けてゆくことが可能になる。巻立て鉄筋１０は、コンクリート柱２０の外周部分に加工鉄筋１４を装着した後に、装着された加工鉄筋１４の張出し継手部１４ｂとコの字状本体部１４ａの他方の端部１４ｃとを好ましくは溶接によって接合することで、四角形の螺旋形状に連続して形成されることになるが、螺旋形状の各３層の螺旋において、４箇所の接合部１５で溶接すれば良いことから、各リング毎に２箇所、３層のリングでは合計６箇所の溶接を必要としていた従来の一般の鉄筋よる巻立て鉄筋と比較して、好ましくは溶接による接合箇所を２／３に減らすことが可能になり、高強度鋼線よりも安価な一般の異形鉄筋を用いて加工鉄筋１４を形成することと相俟って、さらに安価に、リング状（螺旋状）の補強用の鉄筋を、上下方向に所定のピッチで、コンクリート柱２０の外周部分に効率良く設置してゆくことが可能になる。 In other words, according to the present embodiment, the wound reinforcing bar 10 is formed by using the processed reinforcing bars 14 made of a U-shaped main body portion 14a and the overhang joint portion 14b, which are processed using a general deformed reinforcing bar, one by one. It can be attached to the outer peripheral portion of the column 20 and can be attached by an operator's manual operation at low cost without using a dedicated machine. The wound reinforcing bar 10 is preferably formed by attaching the processed rebar 14 to the outer peripheral portion of the concrete column 20 and then connecting the overhanging joint portion 14b of the mounted processed rebar 14 and the other end portion 14c of the U-shaped main body portion 14a. By joining by welding, a quadrilateral spiral shape is formed continuously. However, since each of the three spiral spiral layers has only to be welded at four joints 15, each ring Compared with a conventional rebar with a conventional rebar, which requires a total of six welds in a two-layer, three-layer ring, it is possible to reduce the number of joints by welding to 2/3, In combination with the formation of the processed rebar 14 using a general deformed rebar that is cheaper than a high-strength steel wire, a ring-shaped (helical) reinforcing rebar is provided in a predetermined direction in the vertical direction. Pitch, concree It becomes possible to Yuku be efficiently installed in the outer peripheral portion of the pillar 20.

また、巻立て鉄筋１０を構成する加工鉄筋１４は、一般の異形鉄筋を用いて形成されるので、材料の入手が容易で、加工を迅速に行うことができると共に、高強度鋼線をスパイラル状に巻立ててゆくものと比較して、幅広い形状やサイズに対応することも可能になる。 In addition, since the processed reinforcing bar 14 constituting the wound reinforcing bar 10 is formed using a general deformed reinforcing bar, it is easy to obtain the material, the processing can be performed quickly, and the high-strength steel wire is spirally formed. Compared to those wound around, it is possible to accommodate a wide range of shapes and sizes.

さらに、四角形の螺旋形状を有する巻立て鉄筋１０の各３層の螺旋において、張出し継手部１４ｂとコの字状本体部１４ａの他方の端部１４ｃとの接合部１５は、コンクリート柱２０の四角形の断面形状の異なる４箇所の角部２０ａ，２０ｂ，２０ｃ，２０ｄに順次配置されるようになっており、張出し溶接部１４ｂとコの字状本体部１４ａの他方の端部１４ｃとの好ましくは溶接による接合部１５は、コンクリート柱２０の１箇所の角部に集中することがないので、巻立て鉄筋１０によるより安定した補強体１１を形成することが可能になる。 Furthermore, in the spiral of each of the three layers of the wound reinforcing bar 10 having a quadrangular spiral shape, the joint 15 between the overhang joint 14b and the other end 14c of the U-shaped main body 14a is a quadrangular shape of the concrete column 20. The four corner portions 20a, 20b, 20c, and 20d having different cross-sectional shapes are sequentially arranged, and preferably, the overhang weld portion 14b and the other end portion 14c of the U-shaped main body portion 14a. Since the welded joint portion 15 does not concentrate on one corner of the concrete column 20, it is possible to form a more stable reinforcing body 11 by the wound reinforcing bar 10.

図６（ａ）〜（ｄ）は、本発明の他の実施形態に係る巻立て鉄筋に用いる加工鉄筋１６，１７を既設コンクリート構造物としてのコンクリート柱２０’の外周部分に装着する状況を示すものである。本他の実施形態によれば、コンクリート柱２０’は長方形の断面形状を有しており、複数の加工鉄筋１６，１７は、コの字状本体部１６ａの一対の対向辺１６ｂがコンクリート柱２０’の長方形の断面形状の長辺に対応する長さを備えると共に、中間辺１６ｃが長方形の断面形状の短辺に対応する長さを有する第１加工鉄筋１６と、コの字状本体部１７ａの一対の対向辺１７ｂがコンクリート柱２０’の長方形の断面形状の短辺に対応する長さを備えると共に、中間辺１７ｃが長方形の断面形状の長辺に対応する長さを有する第２加工鉄筋１７との２種類の加工鉄筋１６，１７によって構成されている。 6 (a) to 6 (d) show a situation in which processed reinforcing bars 16 and 17 used for a wound reinforcing bar according to another embodiment of the present invention are mounted on an outer peripheral portion of a concrete column 20 'as an existing concrete structure. Is. According to this other embodiment, the concrete pillar 20 'has a rectangular cross-sectional shape, and the plurality of machined reinforcing bars 16 and 17 have a pair of opposed sides 16b of the U-shaped main body portion 16a. The first processed reinforcing bar 16 having a length corresponding to the long side of the rectangular cross-sectional shape of 'and the intermediate side 16c having a length corresponding to the short side of the rectangular cross-sectional shape; and a U-shaped main body portion 17a A pair of opposite sides 17b of the concrete column 20 'has a length corresponding to the short side of the rectangular cross-sectional shape, and the intermediate side 17c has a length corresponding to the long side of the rectangular cross-sectional shape. 17 and two types of processed reinforcing bars 16 and 17.

本他の実施形態に係る巻立て鉄筋によっても、張出し継手部１６ｄ，１７ｄと、コの字状本体部１６ａ，１７ａの他方の端部１６ｅ，１７ｅとを好ましくは溶接によって接合することで、複数の加工鉄筋１６，１７を四角形の螺旋形状に容易に連続させることができると共に、四角形の螺旋形状の各３層の螺旋において、張出し継手部１６ｄ，１７ｄとコの字状本体部１６ａ，１７ａの他方の端部１６ｅ，１７ｅとの接合部は、コンクリート柱２０’の長方形の断面形状の異なる４箇所の角部に順次配置されることになるので、上記実施形態に係る巻立て鉄筋１０と同様の作用効果を奏することになる。 Even with the wound reinforcing bars according to the other embodiments, the overhang joint portions 16d and 17d and the other end portions 16e and 17e of the U-shaped main body portions 16a and 17a are preferably joined by welding, so that The processed rebars 16 and 17 can be easily continuous in a rectangular spiral shape, and in the three spiral layers of the rectangular spiral shape, the overhang joint portions 16d and 17d and the U-shaped main body portions 16a and 17a Since the joint portions with the other end portions 16e and 17e are sequentially disposed at four corner portions having different rectangular cross-sectional shapes of the concrete column 20 ′, they are the same as the wound reinforcing bar 10 according to the above embodiment. There will be an effect of this.

また、上記各実施形態では、張出し継手部１４ｂ，１６ｄ，１７ｄとコの字状本体部１４ａ，１６ａ，１７ａの他方の端部１４ｃ，１６ｅ，１７ｅとの接合部を、図７及び図８に示すように、機械式継手３１による接合部１５’とすることができる。機械式継手３１としては、例えば柱・梁等のせん断補強筋用機械式継手として公知の、工法名「ＯＳフープクリップ工法」（岡部株式会社製）に用いる、スリーブ３１ａとウェッジ（くさび）３１ｂとからなるものを好ましく用いることができる。 Moreover, in each said embodiment, the junction part of overhanging joint part 14b, 16d, 17d and the other edge part 14c, 16e, 17e of U-shaped main-body part 14a, 16a, 17a is shown in FIG.7 and FIG.8. As shown, the joint portion 15 ′ can be a mechanical joint 31. As the mechanical joint 31, for example, a sleeve 31 a and a wedge 31 b used for a construction method name “OS hoop clip method” (manufactured by Okabe Co., Ltd.) known as a mechanical joint for shear reinforcement bars such as columns and beams, Those consisting of can be preferably used.

「ＯＳフープクリップ工法」に用いる機械式継手３１では、接合すべき一対の鉄筋である張出し継手部１４ｂ，１６ｄ，１７ｄとコの字状本体部１４ａ，１６ａ，１７ａの他方の端部１４ｃ，１６ｅ，１７ｅとを、スリーブ３１ａに各々挿通させると共に、重ねるようにラップさせた状態でセットした後に、専用のくさび締付け器を用いて、スリーブ３１ａの中央部分に形成された定着孔３１ｃにウェッジ３１ｂを圧入して、これらの鉄筋を締め付けた状態で定着させることにより、張出し継手部１４ｂ，１６ｄ，１７ｄとコの字状本体部１４ａ，１６ａ，１７ａの他方の端部１４ｃ，１６ｅ，１７ｅとを、容易に且つ強固に接合することができる。ここで、機械式継手３１による張出し継手部１４ｂ，１６ｄ，１７ｄとコの字状本体部１４ａ，１６ａ，１７ａの他方の端部１４ｃ，１６ｅ，１７ｅとの接合は、張出し継手部１４ｂ，１６ｄ，１７ｄの曲げ加工部から１Ｄ（鉄筋径）以上離した位置で、且つ１Ｄ（鉄筋径）以上の余長を残した状態で行うようにする（図７参照）。 In the mechanical joint 31 used for the “OS hoop clip method”, the extended joint portions 14b, 16d, and 17d, which are a pair of reinforcing bars to be joined, and the other end portions 14c, 16e of the U-shaped main body portions 14a, 16a, and 17a. 17e are inserted into the sleeve 31a and set so as to be overlapped with each other, and then a wedge 31b is formed in the fixing hole 31c formed in the central portion of the sleeve 31a using a dedicated wedge clamp. By press-fitting and fixing these rebars in a tightened state, the overhanging joint portions 14b, 16d, and 17d and the other end portions 14c, 16e, and 17e of the U-shaped body portions 14a, 16a, and 17a, It can be joined easily and firmly. Here, the joints of the overhanging joint portions 14b, 16d, and 17d by the mechanical joint 31 and the other end portions 14c, 16e, and 17e of the U-shaped main body portions 14a, 16a, and 17a are connected to the overhanging joint portions 14b, 16d, This is performed at a position 1D (reinforcing bar diameter) or more away from the bending portion of 17d and leaving a surplus length of 1D (reinforcing bar diameter) or more (see FIG. 7).

張出し継手部１４ｂ，１６ｄ，１７ｄとコの字状本体部１４ａ，１６ａ，１７ａの他方の端部１４ｃ，１６ｅ，１７ｅとの接合部を、機械式継手３１による接合部１５’とすることで、例えばフレア溶接による接合部１５と比較して、施工速度を早くすることが可能になり、施工コストの低減を図ることが可能になる。また風や気温や天候に左右されることなく接合作業を行うことが可能になると共に、接合部１５’の品質を安定させることが可能になる。さらに、張出し継手部１４ｂ，１６ｄ，１７ｄとコの字状本体部１４ａ，１６ａ，１７ａの他方の端部１４ｃ，１６ｅ，１７ｅとの重ね寸法を、例えばフレア溶接による場合と比較して、例えば１／２程度に低減することが可能になり、これによってこれらの鉄筋の設置が容易になると共に、使用する鉄筋量を低減させることが可能になる。 By connecting a joint portion between the overhang joint portions 14b, 16d, and 17d and the other end portions 14c, 16e, and 17e of the U-shaped main body portions 14a, 16a, and 17a as a joint portion 15 ′ by the mechanical joint 31, For example, the construction speed can be increased as compared with the joint 15 by flare welding, and the construction cost can be reduced. In addition, it is possible to perform the joining work without being influenced by wind, temperature, and weather, and it is possible to stabilize the quality of the joining portion 15 '. Furthermore, the overlap dimension of the overhang joint portions 14b, 16d, and 17d and the other end portions 14c, 16e, and 17e of the U-shaped main body portions 14a, 16a, and 17a is, for example, 1 as compared with, for example, flare welding. It becomes possible to reduce to about / 2, which makes it easy to install these reinforcing bars and reduces the amount of reinforcing bars to be used.

なお、本発明は上記各実施形態に限定されることなく種々の変更が可能である。例えば、外周部分に巻立て鉄筋が巻立てられる四角形の断面形状を有する既設コンクリート構造物は、高架橋の橋脚部分のコンクリート柱である必要は必ずしも無く、ビルの柱等であっても良い。また、垂直に立設するコンクリート柱の他、コンクリ−ト梁等の、横方向や斜め方向に延設する四角形の断面形状を有するコンクリート構造物であっても良い。既設コンクリート構造物は、正方形や長方形以外の四角形の断面形状を有していても良く、平行四辺形、ひし形、台形等の断面形状を有していても良い。平行四辺形やひし形の断面形状の場合、２種類の加工鉄筋が必要となり、台形の断面形状の場合、４種類の加工鉄筋が必要となる。 The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, an existing concrete structure having a quadrangular cross-sectional shape in which a wound reinforcing bar is wound around the outer peripheral portion does not necessarily have to be a concrete column of a viaduct pier portion, and may be a building column or the like. Further, in addition to a concrete pillar standing vertically, a concrete structure such as a concrete beam having a quadrangular cross-sectional shape extending in a lateral direction or an oblique direction may be used. The existing concrete structure may have a square cross-sectional shape other than a square or a rectangle, and may have a cross-sectional shape such as a parallelogram, a rhombus, or a trapezoid. In the case of a parallelogram or rhombus cross-sectional shape, two types of machined reinforcing bars are required, and in the case of a trapezoidal cross-sectional shape, four types of machined reinforcing bars are required.

また、張出し継手部とコの字状本体部の他方の端部とを接合部する際に用いる機械式継手は、上述のスリーブとウェッジとからなるものである必要は必ずしも無く、その他の種々の鉄筋用の機械式継手を用いることができる。張出し継手部とコの字状本体部の他方の端部との接合部は、溶接や機械式継手によるものの他、結束線や圧接等による、その他の種々の公知の鉄筋接合手段によるものであっても良い。 Further, the mechanical joint used when joining the overhang joint portion and the other end portion of the U-shaped main body portion does not necessarily need to be composed of the above-described sleeve and wedge, and other various types. Mechanical joints for reinforcing bars can be used. The joint between the overhang joint and the other end of the U-shaped main body is not only by welding or a mechanical joint, but also by various other known reinforcing bar joining means such as a binding wire or pressure welding. May be.

さらに、本発明では、四角形の断面形状を有する既設コンクリート構造物に適用される巻立て鉄筋について記載したが、本発明を発展させたものとして、既設コンクリート構造物の外周形状の３／４の長さに相当する長さを備える、当該外周形状に沿った形状の鉄筋を使用して、例えば円形、多角形、三角形等の断面形状を有する既設コンクリート構造物に適用できる巻立て鉄筋とすることもできる。 Furthermore, in the present invention, the wound reinforcing bar applied to the existing concrete structure having a quadrangular cross-sectional shape is described. However, as an extension of the present invention, the length of the outer peripheral shape of the existing concrete structure is 3/4. It is also possible to use a reinforcing bar having a length corresponding to the length and having a shape along the outer peripheral shape to be a wound reinforcing bar that can be applied to an existing concrete structure having a cross-sectional shape such as a circle, a polygon, or a triangle. it can.

１０巻立て鉄筋
１１補強体
１２金網
１３吹付けモルタル
１４加工鉄筋
１４ａ，１６ａ，１７ａコの字状本体部
１４ｂ，１６ｄ，１７ｄ張出し継手部（加工鉄筋の端部）
１４ｃ，１６ｅ，１７ｅコの字状本体部の他方の端部（加工鉄筋の端部）
１４ｄコの字状本体部の角部
１４ｅコの字状本体部の各辺部
１５張出し継手部とコの字状本体部の他方の端部との接合部
１６第１加工鉄筋
１７第２加工鉄筋
１６ｂ，１７ｂコの字状本体部の一対の対向辺
１６ｃ，１７ｃコの字状本体部の中間辺
２０，２０’ コンクリート柱（四角形の断面形状を有する既設コンクリート構造物）
２０ａ，２０ｂ，２０ｃ，２０ｄコンクリート柱の角部
２０ｅコンクリート柱の各辺部
３１機械式継手 DESCRIPTION OF SYMBOLS 10 Reinforcing bar 11 Reinforcing body 12 Wire net 13 Spraying mortar 14 Reinforcing bar 14a, 16a, 17a U-shaped main body part 14b, 16d, 17d Overhang joint part (end of processed bar)
14c, 16e, 17e The other end of the U-shaped main body (the end of the processed rebar)
14d Corner portion 14e of U-shaped main body portion Each side portion 15 of U-shaped main body portion Joint portion 16 of overhang joint portion and other end portion of U-shaped main body portion 16 First processed reinforcing bar 17 Second processing Reinforcing bars 16b, 17b A pair of opposing sides 16c, 17c of the U-shaped main body part, and the intermediate sides 20, 20 'of the U-shaped main body part (an existing concrete structure having a square cross-sectional shape)
20a, 20b, 20c, 20d Corner 20e of concrete column Each side 31 of concrete column Mechanical joint

Claims

When a reinforcing body for reinforcing an existing concrete structure having a square cross-sectional shape is formed around the existing concrete structure, a winding installed in a square spiral shape along the outer peripheral surface of the existing concrete structure A rebar,
A plurality of bent rebars are installed around the existing concrete structure by joining these ends and continuing into a rectangular spiral shape,
The processed rebar is a U-shaped main body portion having two corners bent so as to have a U-shape along three sides of a square cross-sectional shape of the existing concrete structure; It consists of an overhang joint that bends and extends from the tip of one end of the U-shaped body,
By joining the overhang joint part and the other end of the U-shaped main body part, a plurality of the processed reinforcing bars are continuous in a square spiral shape,
In each of the three-layered spirals having a quadrangular spiral shape, the joints between the overhang joint and the other end are sequentially arranged at four corners having different quadrangular cross-sectional shapes of the existing concrete structure. A wound rebar that looks like this.

The wound reinforcing bar according to claim 1, wherein a joint portion between the overhang joint portion and the other end portion of the U-shaped main body portion is a joint portion by welding.

The wound reinforcing bar according to claim 1, wherein a joint portion between the overhang joint portion and the other end portion of the U-shaped main body portion is a joint portion by a mechanical joint.

The existing concrete structure has a square or substantially square cross-sectional shape, and the plurality of processed rebars forming a spiral shape are such that each side portion of the U-shaped main body portion has the square or substantially square shape. The wound reinforcing bar according to any one of claims 1 to 3, comprising one type of processed reinforcing bar corresponding to each side of the cross-sectional shape and having the same or substantially the same length.

The existing concrete structure has a rectangular cross-sectional shape, and the plurality of processed reinforcing bars have a length in which a pair of opposing sides of the U-shaped main body portion correspond to a long side of the rectangular cross-sectional shape. And a pair of opposite sides of the U-shaped main body portion corresponding to the short side of the rectangular cross-sectional shape, and a first processed reinforcing bar having a length corresponding to the short side of the rectangular cross-sectional shape 4. The structure according to claim 1, further comprising a second processed reinforcing bar and a second processed reinforcing bar having a length corresponding to the long side of the rectangular cross-sectional shape. Winding rebar as described.

The wound reinforcing bar according to any one of claims 1 to 5, wherein the existing concrete structure is a concrete pillar having a square cross-sectional shape.

A machined reinforcing bar used for the wound reinforcing bar according to any one of claims 1 to 6,
A U-shaped main body having two corners bent so as to have a U-shape along three sides of the square cross-sectional shape of the existing concrete structure, and the U-shaped main body A bulging joint portion that is bent and extended from the tip of one end of the portion, and the bulging joint portion and the other end portion of the U-shaped main body portion are joined to form a rectangular spiral. A processed reinforcing bar in which the wound reinforcing bar that is continuous in shape is formed.