JP2018031233A - Joint structure for precast concrete floor slab - Google Patents

Joint structure for precast concrete floor slab Download PDF

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JP2018031233A
JP2018031233A JP2016165675A JP2016165675A JP2018031233A JP 2018031233 A JP2018031233 A JP 2018031233A JP 2016165675 A JP2016165675 A JP 2016165675A JP 2016165675 A JP2016165675 A JP 2016165675A JP 2018031233 A JP2018031233 A JP 2018031233A
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joint
reinforcing bar
stage
precast concrete
concrete floor
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JP6489087B2 (en
JP2018031233A5 (en
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裕明 田中
Hiroaki Tanaka
裕明 田中
敦雄 中山
Atsuo Nakayama
敦雄 中山
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JFE Engineering Corp
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JFE Engineering Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a joint structure for a precast concrete floor slab capable of making a junction part shorter than an overlap joint structure, capable of making a floor slab thinner than a loop reinforcement joint structure and further capable of reducing a burden of reinforcement arrangement work on the job site.SOLUTION: An upper-stage displacement prevention member 16 comprises: an upper-stage shaft part which is joined to a distal end of an upper-stage joint reinforcement 12 in such a manner that central axes are substantially matched with each other; and an upper-stage lock part including an upper-stage inner surface extending obliquely downwards in a direction reverse to a direction of protrusion of the upper-stage joint reinforcement 12 to which the upper-stage displacement prevention member itself is joined, at an opposite side in the direction of protrusion of the upper-stage joint reinforcement 12. A lower-stage displacement prevention member 18 includes: a lower-stage shaft part which is joined to a distal end of a lower-stage joint reinforcement 14 in such a manner that central axes are substantially matched with each other; and a lower-stage lock part including a lower-stage inner surface extending obliquely upwards in a direction reverse to a direction of protrusion of the lower-stage joint reinforcement 14 to which the lower-stage displacement prevention member itself is joined, at an opposite side in the direction of protrusion of the lower-stage joint reinforcement 14.SELECTED DRAWING: Figure 1

Description

本発明は、プレキャストコンクリート床版の継ぎ手構造に関し、詳細には、重ね継ぎ手構造よりも接合部の長さを短くでき、かつ、ループ鉄筋継ぎ手構造よりも床版厚を薄くでき、さらに、現場での配筋作業の負担も少なくすることができるプレキャストコンクリート床版の継ぎ手構造に関する。   The present invention relates to a joint structure of a precast concrete floor slab, and more specifically, the joint length can be made shorter than that of a lap joint structure, and the floor slab thickness can be made thinner than that of a loop reinforcing bar joint structure. The present invention relates to a joint structure of a precast concrete slab that can reduce the burden of bar arrangement work.

プレキャストコンクリート床版の継ぎ手構造の１つに重ね継ぎ手構造がある。重ね継ぎ手構造においては、一般的に鉄筋径の３０倍程度の長さを重ね継ぎ手長さとして確保することが必要であり、重ね継ぎ手構造は接合部の長さが長くなりやすい。   One of the joint structures of precast concrete slabs is a lap joint structure. In the lap joint structure, it is generally necessary to secure a length of about 30 times the diameter of the reinforcing bar as the lap joint length. In the lap joint structure, the length of the joint portion tends to be long.

重ね継ぎ手構造よりも接合部の長さを短くできるプレキャストコンクリート床版の継ぎ手構造として、図２０に示されるようなループ鉄筋継ぎ手構造１００がある（例えば、特許文献１（１３ページ、図１６）参照）。ループ鉄筋継ぎ手構造１００は、橋軸方向に隣り合うプレキャストコンクリート床版１０２同士を橋軸方向に連結する継ぎ手構造であり、ループ鉄筋１０４と、補強鉄筋１０６と、間詰めコンクリート１０８とを有して構成されている。補強鉄筋１０６は橋軸直角方向に延びる鉄筋であり、補強鉄筋１０６の一部は、ループ鉄筋１０４と直交するように、ループ鉄筋１０４の内側に挿入配置されている。   As a joint structure of a precast concrete floor slab in which the length of the joint can be made shorter than the lap joint structure, there is a loop reinforcing bar joint structure 100 as shown in FIG. 20 (see, for example, Patent Document 1 (page 13, FIG. 16)). ). The loop rebar joint structure 100 is a joint structure that connects precast concrete floor slabs 102 adjacent to each other in the bridge axis direction in the bridge axis direction. The loop rebar joint structure 100 includes a loop rebar 104, a reinforcing reinforcing bar 106, and a space-filled concrete 108. It is configured. The reinforcing reinforcing bars 106 are reinforcing bars extending in a direction perpendicular to the bridge axis, and a part of the reinforcing reinforcing bars 106 is inserted and arranged inside the loop reinforcing bars 104 so as to be orthogonal to the loop reinforcing bars 104.

しかし、ループ鉄筋継ぎ手構造１００においては、鉄筋を曲げ加工してループ鉄筋１０４とするため、定められている鉄筋の最小曲げ半径により床版の最小厚が決まってしまう。このため、重ね継ぎ手構造の場合よりもループ鉄筋継ぎ手構造１００を用いた床版は厚さが厚くなりやすい。   However, in the loop reinforcing bar joint structure 100, since the reinforcing bar is bent to form the loop reinforcing bar 104, the minimum thickness of the floor slab is determined by the predetermined minimum bending radius of the reinforcing bar. For this reason, the floor slab using the loop reinforcing bar joint structure 100 tends to be thicker than in the case of the lap joint structure.

また、ループ鉄筋継ぎ手構造１００において、ループ鉄筋１０４内にループ鉄筋１０４と直交するように配置される補強鉄筋１０６は、プレキャストコンクリート床版１０２を所定の設置場所に設置した後に、橋軸直角方向から見てループ鉄筋１０４同士が重なる閉断面の内部に挿入する必要がある。このため、現場での配筋作業に手間が多くかかる。   Further, in the loop reinforcing bar joint structure 100, the reinforcing reinforcing bars 106 arranged in the loop reinforcing bars 104 so as to be orthogonal to the loop reinforcing bars 104 are installed from the direction perpendicular to the bridge axis after the precast concrete floor slab 102 is installed at a predetermined installation location. It is necessary to insert into the closed cross section where the loop reinforcing bars 104 overlap each other. For this reason, much labor is required for the bar arrangement work on site.

特開２０１２−６２６６４号公報JP 2012-62664 A

本発明は、かかる点に鑑みてなされたものであって、重ね継ぎ手構造よりも接合部の長さを短くでき、かつ、ループ鉄筋継ぎ手構造よりも床版厚を薄くでき、さらに、現場での配筋作業の負担も少なくすることができるプレキャストコンクリート床版の継ぎ手構造を提供することを課題とする。   The present invention has been made in view of the above points, and can shorten the length of the joint portion as compared with the lap joint structure, and can reduce the floor slab thickness as compared with the loop reinforcing bar joint structure. It is an object of the present invention to provide a joint structure for a precast concrete slab that can reduce the burden of the bar arrangement work.

本発明は、以下のプレキャストコンクリート床版の継ぎ手構造により、前記課題を解決したものである。   This invention solves the said subject with the joint structure of the following precast concrete floor slabs.

即ち、本発明に係るプレキャストコンクリート床版の継ぎ手構造の第１の態様は、プレキャストコンクリート床版の側端部の接合端面に上下に間隔を開けて埋め込まれていて、前記接合端面から前記プレキャストコンクリート床版の床板面と略平行な方向に突出するように配置されている上段継ぎ手鉄筋および下段継ぎ手鉄筋と、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記接合端面同士の間を充填する間詰め材と、を有していて、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版同士を接続するプレキャストコンクリート床版の継ぎ手構造であって、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記上段継ぎ手鉄筋同士は、略同一の高さ位置に所定の間隔を開けて配置されており、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記下段継ぎ手鉄筋同士は、略同一の高さ位置に所定の間隔を開けて配置されており、突出する前記上段継ぎ手鉄筋の先端には、上段ずれ止め部材がそれぞれ設けられており、前記上段ずれ止め部材は、突出する前記上段継ぎ手鉄筋の先端にお互いの中心軸が略一致するように接合された上段軸部と、自身が接合された前記上段継ぎ手鉄筋の長手方向と直交する水平方向から見て、当該上段継ぎ手鉄筋が突出する方向とは逆の方向に斜め下方に延びる上段内面を当該上段継ぎ手鉄筋の突出する方向とは逆の側に有する上段係止部と、を有してなり、前記上段軸部と前記上段係止部とは一体化されており、突出する前記下段継ぎ手鉄筋の先端には、下段ずれ止め部材がそれぞれ設けられており、前記下段ずれ止め部材は、突出する前記下段継ぎ手鉄筋の先端にお互いの中心軸が略一致するように接合された下段軸部と、自身が接合された前記下段継ぎ手鉄筋の長手方向と直交する水平方向から見て、当該下段継ぎ手鉄筋が突出する方向とは逆の方向に斜め上方に延びる下段内面を当該下段継ぎ手鉄筋の突出する方向とは逆の側に有する下段係止部と、を有してなり、前記下段軸部と前記下段係止部とは一体化されており、さらに、前記上段継ぎ手鉄筋の下方に隣接して配置されていて前記上段継ぎ手鉄筋の長手方向と略直交する略水平方向に延びる上段直交鉄筋が前記上段係止部同士の間に配置されており、前記下段継ぎ手鉄筋の上方に隣接して配置されていて前記下段継ぎ手鉄筋の長手方向と略直交する略水平方向に延びる下段直交鉄筋が前記下段係止部同士の間に配置されており、前記プレキャストコンクリート床版の前記接合端面から突出している前記上段継ぎ手鉄筋の部位、前記プレキャストコンクリート床版の前記接合端面から突出している前記下段継ぎ手鉄筋の部位、前記上段ずれ止め部材、前記下段ずれ止め部材、前記上段直交鉄筋、および前記下段直交鉄筋の周囲は、前記間詰め材に覆われていることを特徴とするプレキャストコンクリート床版の継ぎ手構造である。   That is, the first aspect of the joint structure of the precast concrete floor slab according to the present invention is embedded in the joint end surface of the side end portion of the precast concrete floor slab with a space in the vertical direction from the joint end surface to the precast concrete. The upper and lower joint reinforcing bars arranged so as to protrude in a direction substantially parallel to the floor slab surface of the floor slab, and the joint end faces of the precast concrete floor slab arranged so that the joint end faces face each other A joint structure of precast concrete floor slabs for connecting the precast concrete floor slabs, wherein the joint end surfaces are arranged so as to face each other. The upper joint rebars of the precast concrete floor slabs arranged so that the end faces face each other are The lower joint rebars of the precast concrete slab, which are arranged at substantially the same height position with a predetermined interval and arranged so that the joint end faces face each other, are at substantially the same height position. Disposed at a predetermined interval, an upper-stage detent member is provided at the tip of the protruding upper joint rebar, and the upper-stage detent member is attached to the end of the projecting upper joint rebar. When viewed from the horizontal direction perpendicular to the longitudinal direction of the upper joint rebar to which the upper shaft is joined, the upper shaft joined so that the central axes of the upper joint are substantially coincident with each other, the direction opposite to the direction in which the upper joint rebar protrudes An upper locking portion having an upper inner surface extending obliquely downward in the direction on the side opposite to the direction in which the upper joint reinforcing bar protrudes, and the upper shaft portion and the upper locking portion are integrated. Been A lower-stage detent member is provided at each end of the projecting lower joint rebar, and the lower-stage detent members are arranged so that their central axes substantially coincide with the projecting end of the lower joint rebar. A lower inner surface that extends obliquely upward in a direction opposite to the direction in which the lower joint reinforcing bar protrudes when viewed from the horizontal direction orthogonal to the longitudinal direction of the lower joint reinforcing bar to which the lower lower joint is joined. A lower-stage locking portion on a side opposite to the direction in which the lower-stage joint reinforcing bar protrudes, and the lower-stage shaft portion and the lower-stage locking portion are integrated, and the upper-level joint is further integrated. An upper orthogonal reinforcing bar arranged adjacent to the lower part of the reinforcing bar and extending in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the upper joint reinforcing bar is disposed between the upper locking portions, and Adjacent upward A lower orthogonal reinforcing bar extending in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the lower joint reinforcing bar is disposed between the lower locking portions, and from the joint end surface of the precast concrete slab The projecting portion of the upper joint reinforcing bar, the site of the lower joint reinforcing rod projecting from the joint end surface of the precast concrete floor slab, the upper detent member, the lower detent member, the upper orthogonal rebar, and the lower step The periphery of the orthogonal reinforcing bar is a joint structure of a precast concrete slab characterized by being covered with the padding material.

ここで、本願において、部材の中心軸とは、当該部材の長手方向と直交する当該部材の各断面の図心を連ねて形成される線のことである。   Here, in this application, the central axis of a member is a line formed by connecting the centroids of the respective sections of the member orthogonal to the longitudinal direction of the member.

前記上段継ぎ手鉄筋の中心軸を含む鉛直面で切断した切断面において、当該上段継ぎ手鉄筋に接合されている前記上段ずれ止め部材の前記上段係止部の前記上段内面の当該上段継ぎ手鉄筋の中心軸とのなす角は４５°以上８５°以下であり、前記下段継ぎ手鉄筋の中心軸を含む鉛直面で切断した切断面において、当該下段継ぎ手鉄筋に接合されている前記下段ずれ止め部材の前記下段係止部の前記下段内面の当該下段継ぎ手鉄筋の中心軸とのなす角は４５°以上８５°以下であることが好ましい。   A central axis of the upper joint reinforcing bar of the upper inner surface of the upper locking portion of the upper shift preventing member joined to the upper joint reinforcing bar in a cut surface cut along a vertical plane including the central axis of the upper joint reinforcing bar The lower-stage engagement member of the lower-stage detent member joined to the lower-joint reinforcing bar at a cut surface cut by a vertical plane including the central axis of the lower-joint reinforcing bar is 45 ° to 85 °. It is preferable that the angle formed by the center axis of the lower joint reinforcing bar on the lower inner surface of the stopper is 45 ° or more and 85 ° or less.

本発明に係るプレキャストコンクリート床版の継ぎ手構造の第２の態様は、プレキャストコンクリート床版の側端部の接合端面に上下に間隔を開けて埋め込まれていて、前記接合端面から前記プレキャストコンクリート床版の床板面と略平行な方向に突出するように配置されている上段継ぎ手鉄筋および下段継ぎ手鉄筋と、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記接合端面同士の間を充填する間詰め材と、を有していて、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版同士を接続するプレキャストコンクリート床版の継ぎ手構造であって、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記上段継ぎ手鉄筋同士は、略同一の高さ位置に所定の間隔を開けて配置されており、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記下段継ぎ手鉄筋同士は、略同一の高さ位置に所定の間隔を開けて配置されており、突出する前記上段継ぎ手鉄筋の先端には、上段ずれ止め部材がそれぞれ設けられており、前記上段ずれ止め部材は、突出する前記上段継ぎ手鉄筋の先端にお互いの中心軸が略一致するように接合された上段軸部と、当該上段継ぎ手鉄筋の長手方向と略直交するように下方に延びる上段直交内面を当該上段継ぎ手鉄筋の突出する方向とは逆の側に有する上段係止部と、を有してなり、前記上段軸部と前記上段係止部とは一体化されており、突出する前記下段継ぎ手鉄筋の先端には、下段ずれ止め部材がそれぞれ設けられており、前記下段ずれ止め部材は、突出する前記下段継ぎ手鉄筋の先端にお互いの中心軸が略一致するように接合された下段軸部と、当該下段継ぎ手鉄筋の長手方向と略直交するように上方に延びる下段直交内面を当該下段継ぎ手鉄筋の突出する方向とは逆の側に有する下段係止部と、を有してなり、前記下段軸部と前記下段係止部とは一体化されており、さらに、前記上段継ぎ手鉄筋の下方に隣接して配置されていて前記上段継ぎ手鉄筋の長手方向と略直交する略水平方向に延びる上段直交鉄筋が前記上段係止部同士の間に配置されており、前記下段継ぎ手鉄筋の上方に隣接して配置されていて前記下段継ぎ手鉄筋の長手方向と略直交する略水平方向に延びる下段直交鉄筋が前記下段係止部同士の間に配置されており、前記プレキャストコンクリート床版の前記接合端面から突出している前記上段継ぎ手鉄筋の部位、前記プレキャストコンクリート床版の前記接合端面から突出している前記下段継ぎ手鉄筋の部位、前記上段ずれ止め部材、前記下段ずれ止め部材、前記上段直交鉄筋、および前記下段直交鉄筋の周囲は、前記間詰め材に覆われていることを特徴とするプレキャストコンクリート床版の継ぎ手構造である。   According to the second aspect of the joint structure of the precast concrete floor slab according to the present invention, the precast concrete floor slab is embedded in the joint end surface of the side end portion of the precast concrete floor slab with a space therebetween in the vertical direction. Between the joint end surfaces of the precast concrete slabs arranged so that the joint end surfaces are opposed to the upper joint reinforcing bars and the lower joint reinforcing bars arranged so as to protrude in a direction substantially parallel to the floor plate surface of A joint structure of precast concrete floor slabs connecting the precast concrete floor slabs arranged so that the joint end faces face each other, wherein the joint end faces are The upper joint reinforcing bars of the precast concrete floor slabs arranged to face each other are substantially the same. The lower joint reinforcing bars of the precast concrete floor slabs are arranged at predetermined height positions at substantially the same height position. An upper-stage detent member is provided at the tip of the protruding upper joint reinforcing bar, and the upper-stage detent member is arranged at the center of each other at the end of the projecting upper joint rebar. The upper shaft portion joined so that the shafts substantially coincide with each other, and the upper orthogonal inner surface extending downward so as to be substantially orthogonal to the longitudinal direction of the upper joint rebar is on the side opposite to the protruding direction of the upper joint rebar. The upper shaft portion and the upper step locking portion are integrated, and a lower slip prevention member is provided at the tip of the projecting lower joint reinforcing bar. The lower-stage detent member includes a lower-stage shaft portion joined so that the central axes of the lower-stage joint reinforcing bars substantially coincide with each other, and an upper portion so as to be substantially orthogonal to the longitudinal direction of the lower-stage joint reinforcing bars. A lower locking portion having a lower orthogonal inner surface extending on the side opposite to the direction in which the lower joint reinforcing bar protrudes, and the lower shaft portion and the lower locking portion are integrated. Furthermore, an upper orthogonal reinforcing bar that is arranged adjacent to the lower part of the upper joint reinforcing bar and extends in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the upper joint reinforcing bar is arranged between the upper locking portions. A lower orthogonal reinforcing bar that is disposed adjacent to and above the lower joint reinforcing bar and extends in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the lower joint reinforcing bar is disposed between the lower locking portions, Precast con A portion of the upper joint reinforcing bar protruding from the joint end face of the cleat floor slab, a portion of the lower joint reinforcing bar projecting from the joint end face of the precast concrete floor slab, the upper stage stopper member, the lower stage stopper member, The periphery of the upper orthogonal reinforcing bar and the lower orthogonal reinforcing bar is a joint structure of a precast concrete floor slab characterized by being covered with the padding material.

前記上段ずれ止め部材には、自身が接合されている前記上段継ぎ手鉄筋の上縁よりも上方に位置する部位はなく、前記下段ずれ止め部材には、自身が接合されている前記下段継ぎ手鉄筋の下縁よりも下方に位置する部位はないことが好ましい。   The upper slip prevention member does not have a portion positioned above the upper edge of the upper joint rebar to which it is joined, and the lower slip restraining member has the part of the lower joint rebar to which it is joined. It is preferable that there is no part located below the lower edge.

ここで、上段継ぎ手鉄筋が異形鉄筋の場合、上段継ぎ手鉄筋の上縁は、表面に設けられた凸部も含めて考えた上縁のことであり、下段継ぎ手鉄筋が異形鉄筋の場合、下段継ぎ手鉄筋の下縁は、表面に設けられた凸部も含めて考えた下縁のことである。   Here, when the upper joint rebar is a deformed bar, the upper edge of the upper joint rebar is the upper edge considered including the convex part provided on the surface, and when the lower joint rebar is a deformed rebar, the lower joint The lower edge of a reinforcing bar is the lower edge considered including the convex part provided in the surface.

前記上段係止部および前記下段係止部の形状は、例えば、板状としてもよい。   The shape of the upper stage locking part and the lower stage locking part may be a plate shape, for example.

前記上段ずれ止め部材の前記上段係止部は、該上段ずれ止め部材が接合されている上段継ぎ手鉄筋が突出する方向の側に、自身が接合された前記上段継ぎ手鉄筋の長手方向と直交する水平方向から見て、該上段継ぎ手鉄筋が突出する方向に斜め下方に延びる上段外面を有しており、前記下段ずれ止め部材の前記下段係止部は、該下段ずれ止め部材が接合されている下段継ぎ手鉄筋が突出する方向の側に、自身が接合された前記下段継ぎ手鉄筋の長手方向と直交する水平方向から見て、該下段継ぎ手鉄筋が突出する方向に斜め上方に延びる下段外面を有していることが好ましい。   The upper-stage locking portion of the upper-stage detent member is arranged in a horizontal direction perpendicular to the longitudinal direction of the upper-stage joint reinforcing bar to which the upper-stage detent member is joined, on the side in the direction in which the upper-stage joint rebar is joined. As viewed from the direction, it has an upper outer surface that extends obliquely downward in the direction in which the upper joint reinforcing bar protrudes, and the lower locking portion of the lower locking member is a lower stage to which the lower locking member is joined. A lower outer surface extending obliquely upward in a direction in which the lower joint reinforcing bar protrudes when viewed from a horizontal direction orthogonal to the longitudinal direction of the lower joint reinforcing bar to which the lower reinforcing bar is joined, on the side in which the joint reinforcing bar protrudes. Preferably it is.

前記上段ずれ止め部材は鋳鉄または鋳鋼で一体的に形成されており、前記下段ずれ止め部材は鋳鉄または鋳鋼で一体的に形成されていることが好ましい。   It is preferable that the upper stage stopper member is integrally formed of cast iron or cast steel, and the lower stage stopper member is integrally formed of cast iron or cast steel.

前記上段ずれ止め部材の前記上段軸部は、突出する前記上段継ぎ手鉄筋の前記先端にフラッシュ溶接で接合されていてもよく、前記下段ずれ止め部材の前記下段軸部は、突出する前記下段継ぎ手鉄筋の前記先端にフラッシュ溶接で接合されていてもよい。   The upper shaft portion of the upper shift prevention member may be joined to the tip of the protruding upper joint rebar by flash welding, and the lower shaft portion of the lower shift member protrudes from the protruding lower joint rebar. The tip may be joined by flash welding.

本発明に係るプレキャストコンクリート床版の継ぎ手構造によれば、重ね継ぎ手構造よりも接合部の長さを短くでき、かつ、ループ鉄筋継ぎ手構造よりも床版厚を薄くでき、さらに、現場での配筋作業の負担も少なくすることができる。   According to the joint structure of the precast concrete floor slab according to the present invention, the length of the joint can be made shorter than that of the lap joint structure, the floor slab thickness can be made thinner than that of the loop reinforcing bar joint structure, and further the distribution on site. The burden of muscle work can also be reduced.

本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０を斜め上方から見た斜視図The perspective view which looked at the joint structure 10 of the precast concrete floor slab which concerns on 1st Embodiment of this invention from diagonally upward 図１から上段直交鉄筋２０および下段直交鉄筋２２を除いて描いた斜視図1 is a perspective view drawn from FIG. 1 excluding the upper orthogonal reinforcing bar 20 and the lower orthogonal reinforcing bar 22. 前記継ぎ手構造１０を橋軸直角方向から見た側面図Side view of the joint structure 10 viewed from a direction perpendicular to the bridge axis 前記継ぎ手構造１０において、上段継ぎ手鉄筋１２の先端部および上段ずれ止め部材１６を上段継ぎ手鉄筋１２の中心軸１２Ａを通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図In the joint structure 10, a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the upper joint rebar 12 and the upper slip prevention member 16 with a vertical plane passing through the central axis 12 </ b> A of the upper joint rebar 12. 前記継ぎ手構造１０において、上段ずれ止め部材１６を上段軸部１６Ａの長手方向から見た正面図In the joint structure 10, a front view of the upper shift preventing member 16 as viewed from the longitudinal direction of the upper shaft portion 16 </ b> A. 前記継ぎ手構造１０において、下段継ぎ手鉄筋１４の先端部および下段ずれ止め部材１８を下段継ぎ手鉄筋１４の中心軸１４Ａを通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図In the joint structure 10, a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the lower joint rebar 14 and the lower slip stopper 18 with a vertical plane passing through the central axis 14 </ b> A of the lower joint rebar 14. 前記継ぎ手構造１０において、下段ずれ止め部材１８を下段軸部１８Ａの長手方向から見た正面図In the joint structure 10, a front view of the lower slip prevention member 18 as viewed from the longitudinal direction of the lower shaft portion 18 </ b> A. 前記継ぎ手構造１０の構築に際して、上段直交鉄筋２０および下段直交鉄筋２２を現場で配筋する前の状態を模式的に示す橋軸直角方向から見た側面図Side view of the joint structure 10 as viewed from the direction perpendicular to the bridge axis schematically showing the state before the upper orthogonal reinforcing bars 20 and the lower orthogonal reinforcing bars 22 are arranged on site. 前記継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第１変形例（上段ずれ止め部材２６の上段係止部２６Ｂ）を模式的に示す鉛直断面図Vertical sectional view schematically showing a first modified example (upper locking portion 26B of the upper locking member 26) of the upper locking portion 16B of the upper locking member 16 of the joint structure 10. 前記継ぎ手構造１０の下段ずれ止め部材１８の下段係止部１８Ｂの第１変形例（下段ずれ止め部材２８の下段係止部２８Ｂ）を模式的に示す鉛直断面図A vertical sectional view schematically showing a first modification of the lower locking portion 18B of the lower slip stopper 18 of the joint structure 10 (the lower locking portion 28B of the lower slip stopper 28). 前記継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例（（ａ）上段係止部３０Ａ、（ｂ）上段係止部３０Ｂ）を示す正面図（上段ずれ止め部材１６の上段軸部１６Ａの長手方向から見た正面図）Front view (upper stage deviation) showing a specific example ((a) upper stage locking part 30A, (b) upper stage locking part 30B) of a second modification of the upper stage locking part 16B of the upper stage locking member 16 of the joint structure 10. Front view seen from the longitudinal direction of the upper shaft portion 16A of the stopper member 16) 前記継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例（（ａ）上段係止部３２Ａ、（ｂ）上段係止部３２Ｂ、（ｃ）上段係止部３２Ｃ）を示す正面図（上段ずれ止め部材１６の上段軸部１６Ａの長手方向から見た正面図）Specific examples of the second modified example of the upper locking portion 16B of the upper shift preventing member 16 of the joint structure 10 ((a) upper locking portion 32A, (b) upper locking portion 32B, (c) upper locking portion 32C) (a front view as seen from the longitudinal direction of the upper shaft portion 16A of the upper slip prevention member 16) 前記継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例（（ａ）上段係止部３４Ａ、（ｂ）上段係止部３４Ｂ）を示す正面図（上段ずれ止め部材１６の上段軸部１６Ａの長手方向から見た正面図）Front view (upper stage deviation) showing a specific example ((a) upper stage latching part 34A, (b) upper stage latching part 34B) of the upper stage latching part 16B of the upper stage latching member 16 of the joint structure 10 Front view seen from the longitudinal direction of the upper shaft portion 16A of the stopper member 16) 前記継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例（（ａ）上段係止部３６Ａ、（ｂ）上段係止部３６Ｂ）を示す正面図（上段ずれ止め部材１６の上段軸部１６Ａの長手方向から見た正面図）Front view (upper stage deviation) showing a specific example ((a) upper stage locking part 36A, (b) upper stage locking part 36B) of the second stage locking part 16B of the upper stage locking part 16B of the joint structure 10 Front view seen from the longitudinal direction of the upper shaft portion 16A of the stopper member 16) 本発明の第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０を斜め上方から見た斜視図The perspective view which looked at the joint structure 40 of the precast concrete floor slab which concerns on 2nd Embodiment of this invention from diagonally upward 図１５から上段直交鉄筋２０および下段直交鉄筋２２を除いて描いた斜視図FIG. 15 is a perspective view drawn by removing the upper orthogonal reinforcing bar 20 and the lower orthogonal reinforcing bar 22 from FIG. 前記継ぎ手構造４０を橋軸直角方向から見た側面図Side view of the joint structure 40 viewed from the direction perpendicular to the bridge axis 前記継ぎ手構造４０において、上段継ぎ手鉄筋１２の先端部および上段ずれ止め部材４２を上段継ぎ手鉄筋１２の中心軸１２Ａを通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図In the joint structure 40, a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the upper joint rebar 12 and the upper shift preventing member 42 with a vertical plane passing through the central axis 12 </ b> A of the upper joint rebar 12. 前記継ぎ手構造４０において、下段継ぎ手鉄筋１４の先端部および下段ずれ止め部材４４を下段継ぎ手鉄筋１４の中心軸１４Ａを通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図In the joint structure 40, a vertical cross-sectional view schematically showing a cross section obtained by cutting the tip end portion of the lower joint rebar 14 and the lower slip stopper 44 on a vertical plane passing through the central axis 14 </ b> A of the lower joint rebar 14. ループ鉄筋継ぎ手構造１００を用いた従来の床版相互の連結構造を示す橋軸直角方向から見た縦断側面図Longitudinal side view of a conventional connecting structure between floor slabs using the loop reinforcing bar joint structure 100 as viewed from the direction perpendicular to the bridge axis

以下、図面を参照して、本発明の実施形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

（第１実施形態）
図１は、本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０を斜め上方から見た斜視図であり、図２は、図１から上段直交鉄筋２０および下段直交鉄筋２２を除いて描いた斜視図であり、図３は、本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０を橋軸直角方向から見た側面図である。ただし、図示の都合上、図１および図２においては、間詰めコンクリート２４は描いていない。また、図３では、間詰めコンクリート２４の内部の部材も実線で描いている。 (First embodiment)
FIG. 1 is a perspective view of a joint structure 10 of a precast concrete slab according to a first embodiment of the present invention as viewed obliquely from above, and FIG. 2 excludes the upper and lower orthogonal reinforcing bars 20 and 22 from FIG. FIG. 3 is a side view of the joint structure 10 of the precast concrete floor slab according to the first embodiment of the present invention as viewed from the direction perpendicular to the bridge axis. However, for the sake of illustration, the interstitial concrete 24 is not drawn in FIGS. 1 and 2. In FIG. 3, members inside the interstitial concrete 24 are also drawn with solid lines.

本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０（以下、単に「継ぎ手構造１０」と記すことがある。）は、橋軸方向に隣り合って配置されているプレキャストコンクリート床版５０同士を連結する継ぎ手構造であり、上段継ぎ手鉄筋１２および下段継ぎ手鉄筋１４と、上段継ぎ手鉄筋１２の先端に設けられた上段ずれ止め部材１６と、下段継ぎ手鉄筋１４の先端に設けられた下段ずれ止め部材１８と、上段直交鉄筋２０および下段直交鉄筋２２と、間詰めコンクリート２４とを有して構成されている。   A joint structure 10 of a precast concrete floor slab according to the first embodiment of the present invention (hereinafter sometimes simply referred to as “joint structure 10”) is a precast concrete floor slab arranged adjacent to each other in the bridge axis direction. 50 is a joint structure that connects the two, and the upper joint rebar 12 and the lower joint rebar 14, the upper slip prevention member 16 provided at the tip of the upper joint rebar 12, and the lower slip provided at the tip of the lower joint rebar 14. The stopper member 18, the upper orthogonal reinforcing bar 20 and the lower orthogonal reinforcing bar 22, and the interstitial concrete 24 are configured.

橋軸方向に隣り合って配置されているプレキャストコンクリート床版５０は、側端部の接合端面５２が対向するように配置されており、対向する接合端面５２の間には間詰めコンクリート２４が充填されており、プレキャストコンクリート床版５０の接合端面５２から突出している上段継ぎ手鉄筋１２の部位、プレキャストコンクリート床版５０の接合端面５２から突出している下段継ぎ手鉄筋１４の部位、上段ずれ止め部材１６、下段ずれ止め部材１８、上段直交鉄筋２０、および下段直交鉄筋２２の周囲は、間詰めコンクリート２４で覆われている。   The precast concrete floor slabs 50 arranged adjacent to each other in the bridge axis direction are arranged so that the joint end surfaces 52 of the side ends face each other, and the interstitial concrete 24 is filled between the joint end surfaces 52 facing each other. The upper joint rebar 12 projecting from the joint end surface 52 of the precast concrete floor slab 50, the lower joint rebar 14 projecting from the joint end surface 52 of the precast concrete floor slab 50, the upper slip prevention member 16, The periphery of the lower slip prevention member 18, the upper orthogonal reinforcing bar 20, and the lower orthogonal reinforcing bar 22 is covered with interstitial concrete 24.

プレキャストコンクリート床版５０の側端部の接合端面５２には、上段継ぎ手鉄筋１２および下段継ぎ手鉄筋１４が略橋軸方向に（プレキャストコンクリート床版５０の床版面と略平行な方向に）突出するように埋め込まれており、上段継ぎ手鉄筋１２および下段継ぎ手鉄筋１４は略鉛直方向に上下に間隔（例えば、１００ｍｍ）を開けて配置されている。また、上段継ぎ手鉄筋１２および下段継ぎ手鉄筋１４は、表面に凹凸を備えた異形鉄筋である。   The upper joint rebar 12 and the lower joint rebar 14 protrude from the joint end surface 52 at the side end portion of the precast concrete floor slab 50 substantially in the direction of the bridge axis (in a direction substantially parallel to the floor slab surface of the precast concrete floor slab 50). The upper joint rebar 12 and the lower joint rebar 14 are arranged in a substantially vertical direction with an interval (for example, 100 mm) vertically. Further, the upper joint rebar 12 and the lower joint rebar 14 are deformed reinforcing bars having irregularities on the surface.

接合端面５２が対向するように隣り合って配置されているプレキャストコンクリート床版５０の上段継ぎ手鉄筋１２同士は、略同一の高さ位置に配置されており、所定の間隔（例えば、２５０ｍｍ）で配置されている。   The upper joint reinforcing bars 12 of the precast concrete floor slabs 50 arranged adjacent to each other so that the joining end faces 52 face each other are arranged at substantially the same height, and arranged at a predetermined interval (for example, 250 mm). Has been.

また、接合端面５２が対向するように隣り合って配置されているプレキャストコンクリート床版５０の下段継ぎ手鉄筋１４同士は、略同一の高さ位置に配置されており、所定の間隔（例えば、２５０ｍｍ）で配置されている。   Further, the lower joint reinforcing bars 14 of the precast concrete floor slabs 50 arranged adjacent to each other so that the joint end faces 52 face each other are arranged at substantially the same height position, and have a predetermined interval (for example, 250 mm). Is arranged in.

上段継ぎ手鉄筋１２の先端には、上段ずれ止め部材１６が設けられている。図４は、上段継ぎ手鉄筋１２の先端部および上段ずれ止め部材１６を上段継ぎ手鉄筋１２の中心軸１２Ａを通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図である。   An upper slip prevention member 16 is provided at the tip of the upper joint rebar 12. FIG. 4 is a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the upper joint rebar 12 and the upper shift preventing member 16 along a vertical plane passing through the central axis 12A of the upper joint rebar 12.

図４に示すように、上段ずれ止め部材１６は、上段軸部１６Ａと、上段係止部１６Ｂとを有してなる。上段軸部１６Ａと上段係止部１６Ｂとは一体化されている。   As shown in FIG. 4, the upper slip prevention member 16 includes an upper shaft portion 16A and an upper step locking portion 16B. The upper stage shaft portion 16A and the upper stage locking portion 16B are integrated.

上段軸部１６Ａは、上段継ぎ手鉄筋１２の外径（凹部の外径）と略同一の外径を有しており、突出する上段継ぎ手鉄筋１２の先端に、お互いの中心軸が略一致するように接合されている。この接合は、例えば、フラッシュ溶接を用いて行うことができる。フラッシュ溶接を用いて得られる接合部は接合前よりも若干径が大きくなるが、上段継ぎ手鉄筋１２の凸部の径程度以下に抑えることで、フラッシュ溶接を用いて得られる接合部は上段継ぎ手鉄筋１２と同等のかぶりを確保できる。   The upper shaft portion 16A has an outer diameter that is substantially the same as the outer diameter of the upper joint rebar 12 (the outer diameter of the recess), so that the central axes of the upper joint portions 16A substantially coincide with the tips of the protruding upper joint rebar 12. It is joined to. This joining can be performed using flash welding, for example. The joint obtained by flash welding has a slightly larger diameter than before the joining, but the joint obtained by flash welding can be obtained by suppressing the diameter to the extent of the convex portion of the upper joint rebar 12 or less. A cover equivalent to 12 can be secured.

上段係止部１６Ｂは、上段継ぎ手鉄筋１２の長手方向と直交する水平方向（橋軸直角方向）から見て、当該上段係止部１６Ｂを有する上段ずれ止め部材１６が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の方向に斜め下方に延びる上段内面１６Ｂ１を当該上段継ぎ手鉄筋１２の突出する方向とは逆の側に有する。   When viewed from the horizontal direction (perpendicular to the bridge axis) perpendicular to the longitudinal direction of the upper joint rebar 12, the upper stage latching portion 16 </ b> B is provided with an upper joint reinforcing bar provided with the upper stage detent member 16 having the upper stage retaining portion 16 </ b> B. 12 has an upper inner surface 16B1 extending obliquely downward in a direction opposite to the direction in which the upper joint rebar 12 protrudes on the side opposite to the direction in which the upper joint rebar 12 protrudes.

上段ずれ止め部材１６は、上段内面１６Ｂ１を備えることにより、上段内面１６Ｂ１が支圧抵抗面となって、上段継ぎ手鉄筋１２が間詰めコンクリート２４から引き抜けることを防止する。また、上段内面１６Ｂ１は、上段係止部１６Ｂを有する上段ずれ止め部材１６が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の方向に斜め下方に延びる面であるので、間詰めコンクリート２４に効果的に係止して、プレキャストコンクリート床版５０の接合耐力をさらに向上させるとともに、上段継ぎ手鉄筋１２のはらみ出しに効果的に抵抗する。   The upper slip prevention member 16 includes the upper inner surface 16B1 so that the upper inner surface 16B1 serves as a bearing resistance surface and prevents the upper joint rebar 12 from being pulled out from the interstitial concrete 24. Further, since the upper inner surface 16B1 is a surface extending obliquely downward in a direction opposite to the direction in which the upper joint reinforcing bar 12 provided with the upper shift preventing member 16 having the upper locking portion 16B is provided, the interstitial concrete 24, the joint strength of the precast concrete slab 50 is further improved, and the upper joint rebar 12 is effectively resisted from protruding.

また、上段係止部１６Ｂの上段内面１６Ｂ１と、上段内面１６Ｂ１とは反対側（当該上段係止部１６Ｂを有する上段ずれ止め部材１６が設けられている上段継ぎ手鉄筋１２が突出する方向の側）の上段外面１６Ｂ２とは略平行になっており、上段係止部１６Ｂの形状は板状である。   Further, the upper inner surface 16B1 of the upper stage locking portion 16B and the side opposite to the upper stage inner surface 16B1 (the side in the direction in which the upper joint reinforcing bar 12 provided with the upper stage shift preventing member 16 having the upper stage locking portion 16B is protruded). Is substantially parallel to the upper outer surface 16B2, and the shape of the upper locking portion 16B is plate-shaped.

上段継ぎ手鉄筋１２の中心軸１２Ａを含む鉛直面で切断して得られる切断面において、当該上段継ぎ手鉄筋１２に接合されている上段ずれ止め部材１６の上段係止部１６Ｂの上段内面１６Ｂ１の当該上段継ぎ手鉄筋１２の中心軸１２Ａとのなす角αは、支圧抵抗面を確保する点、間詰めコンクリート２４に効果的に係止する点、および上段継ぎ手鉄筋１２のはらみ出しに効果的に抵抗できる点で、４５°以上８５°以下であることが好ましい。   In the cut surface obtained by cutting along a vertical plane including the central axis 12A of the upper joint rebar 12, the upper stage of the upper inner surface 16B1 of the upper stage locking portion 16B joined to the upper joint rebar 12 The angle α formed with the central axis 12A of the joint rebar 12 can effectively resist the protrusion of the upper joint rebar 12 in terms of securing a bearing resistance resistance point, effectively locking to the interstitial concrete 24, and the like. It is preferable that it is 45 degrees or more and 85 degrees or less at a point.

ここで、上段継ぎ手鉄筋１２の中心軸１２Ａを含む鉛直面で切断して得られる切断面において、上段係止部１６Ｂの上段内面１６Ｂ１の上段継ぎ手鉄筋１２の中心軸１２Ａとのなす角は、図４の角度αのことを意味する。   Here, in the cut surface obtained by cutting along the vertical plane including the central axis 12A of the upper joint rebar 12, the angle formed by the central axis 12A of the upper joint rebar 12 of the upper inner surface 16B1 of the upper locking portion 16B is as shown in FIG. This means an angle α of 4.

図５は、上段ずれ止め部材１６を上段軸部１６Ａの長手方向から見た正面図である。図５に示すように、上段係止部１６Ｂの形状（上段軸部１６Ａの長手方向から見た形状）は略正方形状であり、その１辺の長さは３０ｍｍ〜４０ｍｍ程度である。略正方形状の上段係止部１６Ｂの１辺の長さを３０ｍｍ〜４０ｍｍ程度にすることにより、間詰めコンクリート２４に係止するための支圧抵抗面を確保することができるとともに、間詰めコンクリート２４を充填する際の充填性も良好にすることができる。   FIG. 5 is a front view of the upper slip prevention member 16 as viewed from the longitudinal direction of the upper shaft portion 16A. As shown in FIG. 5, the shape of the upper locking portion 16B (the shape seen from the longitudinal direction of the upper shaft portion 16A) is a substantially square shape, and the length of one side is about 30 mm to 40 mm. By setting the length of one side of the substantially square upper locking portion 16B to about 30 mm to 40 mm, it is possible to secure a bearing resistance resistance surface for locking to the interstitial concrete 24 and to form the interstitial concrete. The filling property when filling 24 can also be improved.

また、図５に示すように、上段係止部１６Ｂは、上段軸部１６Ａの上縁よりも上方に位置する部位はなく、上段継ぎ手鉄筋１２の上縁よりも上方に位置する部位はない。このため、コンクリートのかぶりを確保する上で有利な継ぎ手構造となっている。   Further, as shown in FIG. 5, the upper locking portion 16B does not have a portion positioned above the upper edge of the upper shaft portion 16A, and does not have a portion positioned higher than the upper edge of the upper joint rebar 12. For this reason, it has a joint structure that is advantageous in securing a concrete cover.

上段ずれ止め部材１６の材質は、必要な性能（間詰めコンクリート２４に対する係止効果等）が得られるのであれば特には限定されないが、例えば、上段ずれ止め部材１６を鋳鉄または鋳鋼で成型した部材としてもよい。上段ずれ止め部材１６を鋳鉄または鋳鋼で成型した部材とした場合には、上段ずれ止め部材１６の形状がある程度複雑な形状であっても実現することができ、上段ずれ止め部材１６の各部位が、当該上段ずれ止め部材１６が設けられている上段継ぎ手鉄筋１２の上縁（上段継ぎ手鉄筋１２の表面に設けられた凸部も含めて考えた上縁）よりも上方に位置しないように、上段ずれ止め部材１６を構成することも容易に行うことができる。上段ずれ止め部材１６の各部位が、当該上段ずれ止め部材１６が設けられている上段継ぎ手鉄筋１２の上縁よりも上方に位置しないようにすることで、コンクリートのかぶりを確保する上で有利な継ぎ手構造となる。   The material of the upper slip prevention member 16 is not particularly limited as long as necessary performance (such as a locking effect on the interstitial concrete 24) can be obtained. For example, a member obtained by molding the upper slip prevention member 16 with cast iron or cast steel. It is good. When the upper stage stopper member 16 is a member formed of cast iron or cast steel, the upper stage stopper member 16 can be realized even if the shape of the upper stage stopper member 16 is somewhat complicated. The upper stage so as not to be positioned above the upper edge of the upper joint rebar 12 provided with the upper slip prevention member 16 (the upper edge considered including the convex part provided on the surface of the upper joint rebar 12). The anti-slip member 16 can be easily configured. It is advantageous in securing the concrete cover by preventing each part of the upper slip prevention member 16 from being positioned above the upper edge of the upper joint rebar 12 provided with the upper slip prevention member 16. It becomes a joint structure.

下段継ぎ手鉄筋１４の先端には、下段ずれ止め部材１８が設けられている。図６は、下段継ぎ手鉄筋１４の先端部および下段ずれ止め部材１８を下段継ぎ手鉄筋１４の中心軸１４Ａを通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図である。   A lower-stage slip prevention member 18 is provided at the tip of the lower-stage joint reinforcing bar 14. FIG. 6 is a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the lower joint rebar 14 and the lower slip stopper 18 along a vertical plane passing through the central axis 14A of the lower joint rebar 14.

図６に示すように、下段ずれ止め部材１８は、下段軸部１８Ａと、下段係止部１８Ｂとを有してなる。下段軸部１８Ａと下段係止部１８Ｂとは一体化されている。   As shown in FIG. 6, the lower-stage slip prevention member 18 includes a lower-stage shaft portion 18A and a lower-stage locking portion 18B. The lower-stage shaft portion 18A and the lower-stage locking portion 18B are integrated.

下段軸部１８Ａは、下段継ぎ手鉄筋１４の外径（凹部の外径）と略同一の外径を有しており、突出する下段継ぎ手鉄筋１４の先端に、お互いの中心軸が略一致するように接合されている。この接合は、例えば、フラッシュ溶接を用いて行うことができる。フラッシュ溶接を用いて得られる接合部は接合前よりも若干径が大きくなるが、下段継ぎ手鉄筋１４の凸部の径程度以下に抑えることで、フラッシュ溶接を用いて得られる接合部は下段継ぎ手鉄筋１４と同等のかぶりを確保できる。   The lower shaft portion 18A has an outer diameter that is substantially the same as the outer diameter of the lower joint rebar 14 (the outer diameter of the recess), so that the center axes of the lower joint portions 14A substantially coincide with the tip of the protruding lower joint rebar 14. It is joined to. This joining can be performed using flash welding, for example. The joint obtained by flash welding has a slightly larger diameter than before the joining, but the joint obtained by flash welding has a lower joint rebar by suppressing it to about the diameter of the convex portion of the lower joint rebar 14. A cover equivalent to 14 can be secured.

下段係止部１８Ｂは、下段継ぎ手鉄筋１４の長手方向と直交する水平方向（橋軸直角方向）から見て、当該下段係止部１８Ｂを有する下段ずれ止め部材１８が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の方向に斜め上方に延びる下段内面１８Ｂ１を当該下段継ぎ手鉄筋１４の突出する方向とは逆の側に有する。   The lower locking portion 18B is viewed from the horizontal direction (the direction perpendicular to the bridge axis) perpendicular to the longitudinal direction of the lower joint rebar 14 and is provided with a lower shift stopper 18 having the lower locking portion 18B. 14 has a lower inner surface 18B1 that extends obliquely upward in a direction opposite to the direction in which 14 protrudes, on the side opposite to the direction in which the lower joint rebar 14 protrudes.

下段ずれ止め部材１８は、下段内面１８Ｂ１を備えることにより、下段内面１８Ｂ１が支圧抵抗面となって、下段継ぎ手鉄筋１４が間詰めコンクリート２４から引き抜けることを防止する。また、下段内面１８Ｂ１は、下段係止部１８Ｂを有する下段ずれ止め部材１８が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の方向に斜め上方に延びる面であるので、間詰めコンクリート２４に効果的に係止して、プレキャストコンクリート床版５０の接合耐力をさらに向上させるとともに、下段継ぎ手鉄筋１４のはらみ出しに効果的に抵抗する。   The lower-stage slip prevention member 18 includes the lower-stage inner surface 18B1, thereby preventing the lower-stage inner face 18B1 from being a bearing resistance surface and preventing the lower-stage joint rebar 14 from being pulled out from the interstitial concrete 24. Further, the lower inner surface 18B1 is a surface extending obliquely upward in a direction opposite to the direction in which the lower joint reinforcing bar 14 provided with the lower shift preventing member 18 having the lower locking portion 18B is provided. 24, the joint strength of the precast concrete slab 50 is further improved, and the lower joint rebar 14 is effectively resisted from protruding.

また、下段係止部１８Ｂの下段内面１８Ｂ１と、下段内面１８Ｂ１とは反対側（当該下段係止部１８Ｂを有する下段ずれ止め部材１８が設けられている下段継ぎ手鉄筋１４が突出する方向の側）の下段外面１８Ｂ２とは略平行になっており、下段係止部１８Ｂの形状は板状である。   Further, the lower inner surface 18B1 of the lower locking portion 18B and the side opposite to the lower inner surface 18B1 (the side in the direction in which the lower joint reinforcing bar 14 provided with the lower slip prevention member 18 having the lower locking portion 18B protrudes). The lower step outer surface 18B2 is substantially parallel to the lower step locking portion 18B.

下段継ぎ手鉄筋１４の中心軸１４Ａを含む鉛直面で切断して得られる切断面において、当該下段継ぎ手鉄筋１４に接合されている下段ずれ止め部材１８の下段係止部１８Ｂの下段内面１８Ｂ１の当該下段継ぎ手鉄筋１４の中心軸１４Ａとのなす角βは、支圧抵抗面を確保する点、間詰めコンクリート２４に効果的に係止する点、および下段継ぎ手鉄筋１４のはらみ出しに効果的に抵抗できる点で、４５°以上８５°以下であることが好ましい。   In the cut surface obtained by cutting along the vertical plane including the central axis 14A of the lower joint reinforcing bar 14, the lower stage of the lower inner surface 18B1 of the lower stage locking portion 18B of the lower stage locking member 18 joined to the lower joint reinforcing bar 14 The angle β formed by the central axis 14A of the joint rebar 14 can effectively resist the protrusion of the lower joint rebar 14 in terms of securing a bearing resistance resistance point, effectively locking to the interstitial concrete 24, and the like. It is preferable that it is 45 degrees or more and 85 degrees or less at a point.

ここで、下段継ぎ手鉄筋１４の中心軸１４Ａを含む鉛直面で切断して得られる切断面において、下段係止部１８Ｂの下段内面１８Ｂ１の下段継ぎ手鉄筋１４の中心軸１４Ａとのなす角は、図６の角度βのことを意味する。   Here, in the cut surface obtained by cutting along the vertical plane including the central axis 14A of the lower joint reinforcing bar 14, the angle formed by the central axis 14A of the lower joint reinforcing bar 14 of the lower inner surface 18B1 of the lower locking portion 18B is as shown in FIG. This means an angle β of 6.

図７は、下段ずれ止め部材１８を下段軸部１８Ａの長手方向から見た正面図である。図７に示すように、下段係止部１８Ｂの形状（下段軸部１８Ａの長手方向から見た形状）は略正方形状であり、その１辺の長さは３０ｍｍ〜４０ｍｍ程度である。略正方形状の下段係止部１８Ｂの１辺の長さを３０ｍｍ〜４０ｍｍ程度にすることにより、間詰めコンクリート２４に係止するための支圧抵抗面を確保することができるとともに、間詰めコンクリート２４を充填する際の充填性も良好にすることができる。   FIG. 7 is a front view of the lower slip prevention member 18 as viewed from the longitudinal direction of the lower shaft portion 18A. As shown in FIG. 7, the shape of the lower locking portion 18B (the shape seen from the longitudinal direction of the lower shaft portion 18A) is a substantially square shape, and the length of one side is about 30 mm to 40 mm. By setting the length of one side of the substantially square lower-stage locking portion 18B to about 30 mm to 40 mm, it is possible to secure a bearing resistance resistance surface for locking to the space-filled concrete 24, and space-filled concrete. The filling property when filling 24 can also be improved.

また、図７に示すように、下段係止部１８Ｂは、下段軸部１８Ａの下縁よりも下方に位置する部位はなく、下段継ぎ手鉄筋１４の下縁よりも下方に位置する部位はない。このため、コンクリートのかぶりを確保する上で有利な継ぎ手構造となっている。   Further, as shown in FIG. 7, the lower locking portion 18B has no part positioned below the lower edge of the lower shaft part 18A, and does not have a part positioned below the lower edge of the lower joint rebar 14. For this reason, it has a joint structure that is advantageous in securing a concrete cover.

下段ずれ止め部材１８の材質は、必要な性能（間詰めコンクリート２４に対する係止効果等）が得られるのであれば特には限定されないが、例えば、下段ずれ止め部材１８を鋳鉄または鋳鋼で成型した部材としてもよい。下段ずれ止め部材１８を鋳鉄または鋳鋼で成型した部材とした場合には、下段ずれ止め部材１８の形状がある程度複雑な形状であっても実現することができ、下段ずれ止め部材１８の各部位が、当該下段ずれ止め部材１８が設けられている下段継ぎ手鉄筋１４の下縁（下段継ぎ手鉄筋１４の表面に設けられた凸部も含めて考えた下縁）よりも下方に位置しないように、下段ずれ止め部材１８を構成することも容易に行うことができる。下段ずれ止め部材１８の各部位が、当該下段ずれ止め部材１８が設けられている下段継ぎ手鉄筋１４の下縁よりも下方に位置しないようにすることで、コンクリートのかぶりを確保する上で有利な継ぎ手構造となる。   The material of the lower slip prevention member 18 is not particularly limited as long as necessary performance (such as a locking effect on the interstitial concrete 24) can be obtained. For example, a member obtained by molding the lower slip prevention member 18 with cast iron or cast steel. It is good. When the lower stage stopper member 18 is a member formed of cast iron or cast steel, the lower stage stopper member 18 can be realized even if the shape of the lower stage stopper member 18 is somewhat complicated. The lower stage so as not to be positioned below the lower edge of the lower joint rebar 14 provided with the lower slip prevention member 18 (the lower edge considered including the convex part provided on the surface of the lower joint rebar 14). The anti-slip member 18 can be easily configured. It is advantageous in securing the concrete cover by preventing each part of the lower slip prevention member 18 from being positioned below the lower edge of the lower joint rebar 14 at which the lower slip prevention member 18 is provided. It becomes a joint structure.

また、本第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０においては、上段継ぎ手鉄筋１２の下方に隣接して配置されていて上段継ぎ手鉄筋１２の長手方向と略直交する略水平方向に延びる上段直交鉄筋２０が上段係止部１６Ｂ同士の間に配置されており、さらに、下段継ぎ手鉄筋１４の上方に隣接して配置されていて下段継ぎ手鉄筋１４の長手方向と略直交する略水平方向に延びる下段直交鉄筋２２が下段係止部１８Ｂ同士の間に配置されている。   Moreover, in the joint structure 10 of the precast concrete floor slab according to the first embodiment, the precast concrete floor slab joint structure 10 is arranged adjacent to the lower part of the upper joint rebar 12 and extends in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the upper joint rebar 12. The upper orthogonal reinforcing bar 20 is disposed between the upper locking portions 16B, and is disposed adjacent to the upper portion of the lower joint reinforcing bar 14 in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the lower joint reinforcing bar 14. The extending lower orthogonal reinforcing bars 22 are disposed between the lower locking portions 18B.

このように上段直交鉄筋２０および下段直交鉄筋２２が配置されていることにより、本第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０は継ぎ手部以外の部位と同等の耐力を確保することができる。   By arranging the upper orthogonal reinforcing bars 20 and the lower orthogonal reinforcing bars 22 in this way, the joint structure 10 of the precast concrete floor slab according to the first embodiment can ensure the same yield strength as the parts other than the joint portions. it can.

上段直交鉄筋２０および下段直交鉄筋２２を現場で配筋するためには、図８に示すように、上段継ぎ手鉄筋１２に必要な本数だけ上段直交鉄筋２０および下段直交鉄筋２２をそれぞれ針金２３等の線材で取り付けておき、プレキャストコンクリート床版５０を所定の位置に配置した後に、取り付けに用いた針金２３等の線材を取り外し、上段直交鉄筋２０および下段直交鉄筋２２を所定の位置に配置すればよい。このため、現場において橋軸直角方向に鉄筋を挿入することは不要であり、上段直交鉄筋２０および下段直交鉄筋２２の配筋作業は容易である。   In order to arrange the upper orthogonal reinforcing bars 20 and the lower orthogonal reinforcing bars 22 in the field, as shown in FIG. 8, the upper orthogonal reinforcing bars 20 and the lower orthogonal reinforcing bars 22 corresponding to the number required for the upper joint reinforcing bars 12 are respectively made of wire 23 or the like. After attaching the precast concrete floor slab 50 at a predetermined position, the wire 23 such as the wire 23 used for the attachment is removed, and the upper and lower orthogonal reinforcing bars 20 and 22 are arranged at predetermined positions. . For this reason, it is not necessary to insert reinforcing bars in the direction perpendicular to the bridge axis at the site, and the work of arranging the upper and lower orthogonal reinforcing bars 20 and 22 is easy.

一方、従来のループ鉄筋継ぎ手構造を用いた場合には、橋軸直角方向から見てループ鉄筋同士が重なる閉断面の内部に、橋軸直角方向に鉄筋を挿入することが必要であり、現場での上段直交鉄筋および下段直交鉄筋の配筋作業に手間がかかっていた。   On the other hand, when the conventional loop rebar joint structure is used, it is necessary to insert the rebar in the direction perpendicular to the bridge axis inside the closed section where the loop rebars overlap each other when viewed from the direction perpendicular to the bridge axis. It took time and effort to arrange the upper and lower orthogonal reinforcing bars.

（第１実施形態の効果）
本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０は、上段継ぎ手鉄筋１２の先端に設けられた上段ずれ止め部材１６と、下段継ぎ手鉄筋１４の先端に設けられた下段ずれ止め部材１８と、を有しており、上段ずれ止め部材１６の上段係止部１６Ｂは、上段係止部１６Ｂを有する上段ずれ止め部材１６が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の方向に斜め下方に延びる上段内面１６Ｂ１を有しており、下段ずれ止め部材１８の下段係止部１８Ｂは、下段係止部１８Ｂを有する下段ずれ止め部材１８が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の方向に斜め上方に延びる下段内面１８Ｂ１を有している。 (Effect of 1st Embodiment)
The joint structure 10 of the precast concrete floor slab according to the first embodiment of the present invention includes an upper shift prevention member 16 provided at the tip of the upper joint rebar 12 and a lower slip prevention member provided at the tip of the lower joint rebar 14. 18 and the upper locking portion 16B of the upper locking member 16 is opposite to the direction in which the upper joint reinforcing bar 12 provided with the upper locking member 16 having the upper locking portion 16B is projected. The lower joint member 18B has an upper inner surface 16B1 extending obliquely downward in the direction of the lower joint, and the lower stopper member 18B of the lower stopper member 18 is provided with a lower stopper member 18 having a lower stopper member 18B. Has a lower inner surface 18B1 extending obliquely upward in a direction opposite to the direction in which the protrusion protrudes.

前述したように、上段内面１６Ｂ１および下段内面１８Ｂ１は、間詰めコンクリート２４に効果的に係止するように、上段継ぎ手鉄筋１２および下段継ぎ手鉄筋１４に対して斜めに配置されているので、本第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０は接合耐力が大きくなっており、このため、従来の重ね継ぎ手構造よりも接合部の長さを短くできる。   As described above, the upper inner surface 16B1 and the lower inner surface 18B1 are disposed obliquely with respect to the upper joint reinforcing bar 12 and the lower joint reinforcing bar 14 so as to be effectively locked to the interstitial concrete 24. The joint structure 10 of the precast concrete floor slab according to the embodiment has a large joint strength, and therefore, the length of the joint portion can be made shorter than that of the conventional lap joint structure.

また、本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０においては、鉄筋をループ状に加工する必要がないため、従来のループ鉄筋継ぎ手構造よりも床版厚を薄くすることができる。   Moreover, in the joint structure 10 of the precast concrete floor slab according to the first embodiment of the present invention, since it is not necessary to process the reinforcing bar into a loop shape, the floor slab thickness can be made thinner than the conventional loop reinforcing bar joint structure. it can.

さらに、本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０においては、橋軸直角方向から見て従来のループ鉄筋継ぎ手構造のような閉断面はなく、橋軸直角方向に配置する補強用の鉄筋を橋軸直角方向から接合部に差し込む必要はなく、現場での配筋作業の負担も少なくすることができる。   Furthermore, in the joint structure 10 of the precast concrete floor slab according to the first embodiment of the present invention, there is no closed cross section as in the conventional loop reinforcing bar joint structure when viewed from the direction perpendicular to the bridge axis, and the joint structure 10 is arranged in the direction perpendicular to the bridge axis. It is not necessary to insert reinforcing bars into the joint from the direction perpendicular to the bridge axis, and the burden of the bar arrangement work on site can be reduced.

なお、本第１実施形態に係る継ぎ手構造１０においては、対向する接合端面５２の間を充填する間詰め材として間詰めコンクリート２４を用いたが、プレキャストコンクリート床版５０の接合端面５２から突出している上段継ぎ手鉄筋１２の部位、プレキャストコンクリート床版５０の接合端面５２から突出している下段継ぎ手鉄筋１４の部位、上段ずれ止め部材１６、下段ずれ止め部材１８、上段直交鉄筋２０、および下段直交鉄筋２２の周囲を覆って、それらの部材を十分に一体化できるのであれば、対向する接合端面５２の間を充填する間詰め材としてコンクリート以外の材料を用いてもよく、要求される性能を満たすのであれば、例えば、モルタルや樹脂モルタル等を間詰めコンクリート２４に替えて用いることも可能である。   In the joint structure 10 according to the first embodiment, the interstitial concrete 24 is used as the interstitial material for filling the space between the opposing joint end surfaces 52. However, the joint structure 10 protrudes from the joint end surface 52 of the precast concrete floor slab 50. The upper joint rebar 12, the lower joint rebar 14 projecting from the joint end surface 52 of the precast concrete slab 50, the upper slip prevention member 16, the lower slip prevention member 18, the upper orthogonal reinforcement 20, and the lower orthogonal reinforcement 22 As long as these members can be sufficiently integrated, it is possible to use a material other than concrete as a filling material for filling the space between the opposing joint end faces 52, and satisfy the required performance. If present, for example, mortar, resin mortar, or the like can be used instead of the interstitial concrete 24.

（第１実施形態の第１変形例）
本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０において、上段係止部１６Ｂの上段内面１６Ｂ１および上段外面１６Ｂ２は略平行になっていて、上段係止部１６Ｂの形状は板状になっており、また、下段係止部１８Ｂの下段内面１８Ｂ１および下段外面１８Ｂ２は略平行になっていて、下段係止部１８Ｂの形状は板状になっていたが、本第１実施形態において、上段ずれ止め部材の上段係止部および下段ずれ止め部材の下段係止部の形状は板状に限られるわけではない。上段係止部１６Ｂの上段内面１６Ｂ１と同様の斜め下方に延びる面（上段係止部１６Ｂを有する上段ずれ止め部材１６が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の方向に斜め下方に延びる面）を備えていれば、上段係止部の形状は板状以外の形状でもよい。また、下段係止部１８Ｂの下段内面１８Ｂ１と同様の斜め上方に延びる面（下段係止部１８Ｂを有する下段ずれ止め部材１８が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の方向に斜め上方に延びる面）を備えていれば、下段係止部の形状は板状以外の形状でもよい。 (First modification of the first embodiment)
In the joint structure 10 of the precast concrete floor slab according to the first embodiment of the present invention, the upper inner surface 16B1 and the upper outer surface 16B2 of the upper locking portion 16B are substantially parallel, and the shape of the upper locking portion 16B is a plate shape. Further, the lower inner surface 18B1 and the lower outer surface 18B2 of the lower locking portion 18B are substantially parallel, and the shape of the lower locking portion 18B is plate-like, but in the first embodiment, The shapes of the upper latching portion of the upper slip prevention member and the lower latch portion of the lower slip prevention member are not limited to a plate shape. A surface extending obliquely downward, similar to the upper inner surface 16B1 of the upper locking portion 16B (obliquely inclined in a direction opposite to the direction in which the upper joint rebar 12 provided with the upper shift preventing member 16 having the upper locking portion 16B is projected. As long as a surface extending downward is provided, the shape of the upper locking portion may be other than a plate shape. Further, a surface extending obliquely upward, similar to the lower inner surface 18B1 of the lower locking portion 18B (the direction opposite to the direction in which the lower joint rebar 14 provided with the lower slip prevention member 18 having the lower locking portion 18B protrudes) 2), the lower locking portion may have a shape other than a plate shape.

図９は、第１実施形態に係る継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第１変形例（上段ずれ止め部材２６の上段係止部２６Ｂ）を模式的に示す鉛直断面図（上段継ぎ手鉄筋１２の先端部および上段ずれ止め部材２６を上段継ぎ手鉄筋１２の中心軸を通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図）であり、図１０は、第１実施形態に係る継ぎ手構造１０の下段ずれ止め部材１８の下段係止部１８Ｂの第１変形例（下段ずれ止め部材２８の下段係止部２８Ｂ）を模式的に示す鉛直断面図（下段継ぎ手鉄筋１４の先端部および下段ずれ止め部材２８を下段継ぎ手鉄筋１４の中心軸を通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図）である。   FIG. 9 is a vertical cross-sectional view schematically showing a first modification of the upper locking portion 16B of the upper shift preventing member 16 of the joint structure 10 according to the first embodiment (upper locking portion 26B of the upper shift preventing member 26). FIG. 10 is a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the upper joint rebar 12 and the upper slip stopper 26 with a vertical plane passing through the central axis of the upper joint rebar 12, and FIG. 1 is a vertical sectional view (lower joint) schematically showing a first modification of the lower locking portion 18B of the lower locking member 18 of the joint structure 10 according to the first embodiment (the lower locking portion 28B of the lower locking member 28). FIG. 6 is a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the reinforcing bar 14 and the lower-stage deviation preventing member 28 along a vertical plane passing through the central axis of the lower-stage joint reinforcing bar 14.

図９に示すように、上段ずれ止め部材１６の第１変形例である上段ずれ止め部材２６の上段係止部２６Ｂは、上段継ぎ手鉄筋１２の中心軸を通る鉛直面で切断して得られる断面の形状が台形であり、上段係止部２６Ｂは、上段係止部１６Ｂの上段内面１６Ｂ１と同様の斜め下方に延びる上段内面２６Ｂ１（上段係止部２６Ｂを有する上段ずれ止め部材２６が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の方向に斜め下方に延びる面）を、上段係止部２６Ｂを有する上段ずれ止め部材２６が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の側に有するが、上段内面２６Ｂ１とは反対側（上段係止部２６Ｂを有する上段ずれ止め部材２６が設けられている上段継ぎ手鉄筋１２が突出する方向の側）の上段外面２６Ｂ２は、上段係止部２６Ｂを有する上段ずれ止め部材２６が設けられている上段継ぎ手鉄筋１２が突出する方向に斜め下方に延びる面になっている。このため、上段継ぎ手鉄筋１２が上方にはらみ出そうとするときに、上段外面２６Ｂ２は間詰めコンクリート２４からの抵抗力を受けることになる。したがって、上段係止部１６Ｂを有する上段ずれ止め部材１６に替えて上段係止部２６Ｂを有する上段ずれ止め部材２６を用いることにより、上段継ぎ手鉄筋１２の上方へのはらみ出しをより起こりにくくすることができる。   As shown in FIG. 9, the upper locking portion 26 </ b> B of the upper shift stopper 26, which is a first modification of the upper shift stopper 16, is a cross section obtained by cutting along a vertical plane passing through the central axis of the upper joint rebar 12. The upper locking portion 26B is provided with an upper inner surface 26B1 (an upper shift preventing member 26 having an upper locking portion 26B) extending obliquely downward, similar to the upper inner surface 16B1 of the upper locking portion 16B. The surface extending obliquely downward in the direction opposite to the direction in which the upper joint rebar 12 protrudes is defined as the direction in which the upper joint rebar 12 in which the upper slip prevention member 26 having the upper stage locking portion 26B is provided projects. Although it is on the opposite side, the upper outer surface 26B2 on the opposite side to the upper inner surface 26B1 (the side in the direction in which the upper joint rebar 12 on which the upper shift stopper member 26 having the upper locking portion 26B is provided) protrudes, Upper coupling reinforcing bars 12 upper displacement preventing member 26 having a stepped locking portion 26B is provided is in a plane extending obliquely downwardly in the direction to protrude. For this reason, the upper outer surface 26B2 receives a resistance force from the interstitial concrete 24 when the upper joint rebar 12 tries to protrude upward. Therefore, by using the upper shift stopper 26 having the upper locking portion 26B instead of the upper shift stopper 16 having the upper locking portion 16B, the upper joint rebar 12 can be prevented from protruding upward. Can do.

また、図１０に示すように、下段ずれ止め部材１８の第１変形例である下段ずれ止め部材２８の下段係止部２８Ｂは、下段継ぎ手鉄筋１４の中心軸を通る鉛直面で切断して得られる断面の形状が台形であり、下段係止部２８Ｂは、下段係止部１８Ｂの下段内面１８Ｂ１と同様の斜め上方に延びる下段内面２８Ｂ１（下段係止部２８Ｂを有する下段ずれ止め部材２８が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の方向に斜め上方に延びる面）を、下段係止部２８Ｂを有する下段ずれ止め部材２８が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の側に有するが、下段内面２８Ｂ１とは反対側（下段係止部２８Ｂを有する下段ずれ止め部材２８が設けられている下段継ぎ手鉄筋１４が突出する方向の側）の下段外面２８Ｂ２は、下段係止部２８Ｂを有する下段ずれ止め部材２８が設けられている下段継ぎ手鉄筋１４が突出する方向に斜め上方に延びる面になっている。このため、下段継ぎ手鉄筋１４が下方にはらみ出そうとするときに、下段外面２８Ｂ２は間詰めコンクリート２４からの抵抗力を受けることになる。したがって、下段係止部１８Ｂを有する下段ずれ止め部材１８に替えて下段係止部２８Ｂを有する下段ずれ止め部材２８を用いることにより、下段継ぎ手鉄筋１４の下方へのはらみ出しをより起こりにくくすることができる。   Further, as shown in FIG. 10, the lower stage locking portion 28 </ b> B which is a first modification of the lower stage locking member 18 is obtained by cutting along a vertical plane passing through the central axis of the lower joint rebar 14. The shape of the cross section is trapezoidal, and the lower locking portion 28B is provided with a lower inner surface 28B1 (lower lower locking member 28 having a lower locking portion 28B) that extends obliquely upward like the lower inner surface 18B1 of the lower locking portion 18B. The direction in which the lower joint rebar 14 provided with the lower-stage detent member 28 having the lower-stage locking portion 28B protrudes on the surface extending obliquely upward in the direction opposite to the direction in which the lower joint rebar 14 protrudes. The lower outer surface 28 on the opposite side to the lower inner surface 28B1 (the side in the direction in which the lower joint rebar 14 in which the lower slip prevention member 28 having the lower locking portion 28B is provided) protrudes. 2 has a surface extending in a direction lower joint reinforcement 14 lower displacement preventing member 28 having a lower locking portion 28B is provided to project obliquely upward. For this reason, when the lower joint rebar 14 is about to protrude downward, the lower outer surface 28 </ b> B <b> 2 receives a resistance force from the interstitial concrete 24. Therefore, by using the lower shift preventing member 28 having the lower locking portion 28B instead of the lower shift preventing member 18 having the lower locking portion 18B, the lower joint rebar 14 is less likely to protrude downward. Can do.

なお、図９において、符号２６Ａは上段軸部１６Ａと同様の上段軸部であり、図１０において、符号２８Ａは下段軸部１８Ａと同様の下段軸部である。   In FIG. 9, reference numeral 26 </ b> A is an upper stage shaft part similar to the upper stage shaft part 16 </ b> A, and in FIG. 10, reference numeral 28 </ b> A is a lower stage shaft part similar to the lower stage shaft part 18 </ b> A.

（第１実施形態の第２変形例）
第１実施形態の第１変形例では、上段ずれ止め部材２６の上段係止部２６Ｂの鉛直断面形状（上段継ぎ手鉄筋１２の中心軸を通る鉛直面で切断して得られる断面の形状）および下段ずれ止め部材２８の下段係止部２８Ｂの鉛直断面形状（下段継ぎ手鉄筋１４の中心軸を通る鉛直面で切断して得られる断面の形状）が台形である点が、第１実施形態の上段ずれ止め部材１６の上段係止部１６Ｂおよび下段ずれ止め部材１８の下段係止部１８Ｂの形状と異なっていたが、第１実施形態の第２変形例では、上段ずれ止め部材の上段係止部を正面から（上段ずれ止め部材の上段軸部の長手方向から）見た形状および下段ずれ止め部材の下段係止部を正面から（下段ずれ止め部材の下段軸部の長手方向から）見た形状が、第１実施形態の上段ずれ止め部材１６の上段係止部１６Ｂおよび下段ずれ止め部材１８の下段係止部１８Ｂの形状（正方形状）とは異なる。 (Second modification of the first embodiment)
In the first modification of the first embodiment, the vertical sectional shape of the upper locking portion 26B of the upper shift preventing member 26 (the cross-sectional shape obtained by cutting along the vertical plane passing through the central axis of the upper joint rebar 12) and the lower The upper stage deviation of the first embodiment is that the vertical cross-sectional shape (the cross-sectional shape obtained by cutting along the vertical plane passing through the central axis of the lower joint joint 14) of the lower stage locking portion 28B of the deviation prevention member 28 is a trapezoid. Although the shape of the upper locking portion 16B of the locking member 16 and the shape of the lower locking portion 18B of the lower shifting member 18 are different, in the second modification of the first embodiment, the upper locking portion of the upper locking member is The shape seen from the front (from the longitudinal direction of the upper shaft portion of the upper slip prevention member) and the shape seen from the front (from the longitudinal direction of the lower shaft portion of the lower slip prevention member) of the lower slip prevention member , Upper stage slip prevention part of the first embodiment 16 differs from the shape of the lower locking portions 18B of the upper engaging portion 16B and the lower displacement preventing member 18 (square) of.

図１１は、第１実施形態に係る継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例（（ａ）上段係止部３０Ａ、（ｂ）上段係止部３０Ｂ）を示す正面図（上段ずれ止め部材１６の上段軸部１６Ａの長手方向から見た正面図）であり、上段係止部の正面形状が略四角形の場合の例である。上段軸部の形状は第１実施形態の上段ずれ止め部材１６の上段軸部１６Ａと同様であるので、図１１においても、上段軸部には符号１６Ａを付している。図１１（ａ）に示す上段係止部３０Ａの正面形状は、上段ずれ止め部材の上段軸部１６Ａの長手方向と直交する水平方向に長い略長方形状であり、上下方向の長さが上段軸部１６Ａの上下方向の径と略一致している。図１１（ｂ）に示す上段係止部３０Ｂの正面形状は、上段軸部１６Ａの長手方向と直交する方向で下方向に長い略長方形状であり、水平方向の長さが上段軸部１６Ａの水平方向の径と略一致している。   FIG. 11 is a specific example of the second modification of the upper stage locking portion 16B of the upper stage locking member 16 of the joint structure 10 according to the first embodiment ((a) the upper stage locking portion 30A, (b) the upper stage locking portion. 30B) is a front view (a front view as seen from the longitudinal direction of the upper shaft portion 16A of the upper shift preventing member 16), and is an example in which the front shape of the upper lock portion is a substantially square shape. Since the shape of the upper shaft portion is the same as that of the upper shaft portion 16A of the upper shift preventing member 16 of the first embodiment, the upper shaft portion is also denoted by reference numeral 16A in FIG. The front shape of the upper locking portion 30A shown in FIG. 11A is a substantially rectangular shape that is long in the horizontal direction perpendicular to the longitudinal direction of the upper shaft portion 16A of the upper slip prevention member, and the vertical length is the upper shaft. The diameter substantially coincides with the diameter in the vertical direction of the portion 16A. The front shape of the upper locking portion 30B shown in FIG. 11B is a substantially rectangular shape that is long in the downward direction in a direction orthogonal to the longitudinal direction of the upper shaft portion 16A, and the horizontal length of the upper shaft portion 16A. It is approximately the same as the horizontal diameter.

図１２は、第１実施形態に係る継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例（（ａ）上段係止部３２Ａ、（ｂ）上段係止部３２Ｂ、（ｃ）上段係止部３２Ｃ）を示す正面図（上段ずれ止め部材１６の上段軸部１６Ａの長手方向から見た正面図）であり、上段係止部の正面形状が略三角形の場合の例である。上段軸部の形状は第１実施形態の上段ずれ止め部材１６の上段軸部１６Ａと同様であるので、図１２においても、上段軸部には符号１６Ａを付している。図１２（ａ）に示す上段係止部３２Ａの正面形状は、上段軸部１６Ａの長手方向と直交する水平方向に長い辺が上辺となっている略三角形であり、図１２（ｂ）に示す上段係止部３２Ｂの正面形状は、上段軸部１６Ａの長手方向と直交する水平方向に長い辺が下辺となっている略三角形であり、図１２（ｃ）に示す上段係止部３２Ｃの正面形状は、上段軸部１６Ａの長手方向と直交する水平方向に（上段継ぎ手鉄筋１２の側面に）２つの略三角形が設けられた形状である。   12A and 12B are specific examples of the second modification of the upper stage locking portion 16B of the upper stage locking member 16 of the joint structure 10 according to the first embodiment ((a) the upper stage locking portion 32A, (b) the upper stage locking portion. 32B and (c) is a front view showing the upper locking portion 32C) (a front view seen from the longitudinal direction of the upper shaft portion 16A of the upper slip prevention member 16), and the front shape of the upper locking portion is substantially triangular. It is an example. Since the shape of the upper shaft portion is the same as that of the upper shaft portion 16A of the upper slip prevention member 16 of the first embodiment, the upper shaft portion is also denoted by reference numeral 16A in FIG. The front shape of the upper locking portion 32A shown in FIG. 12 (a) is a substantially triangular shape having a long side in the horizontal direction perpendicular to the longitudinal direction of the upper shaft portion 16A as the upper side, and is shown in FIG. 12 (b). The front shape of the upper locking portion 32B is a substantially triangular shape with a long side in the horizontal direction perpendicular to the longitudinal direction of the upper shaft portion 16A being the lower side, and the front surface of the upper locking portion 32C shown in FIG. The shape is a shape in which two substantially triangular shapes are provided in the horizontal direction orthogonal to the longitudinal direction of the upper shaft portion 16A (on the side surface of the upper joint reinforcement 12).

図１３は、第１実施形態に係る継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例（（ａ）上段係止部３４Ａ、（ｂ）上段係止部３４Ｂ）を示す正面図（上段ずれ止め部材１６の上段軸部１６Ａの長手方向から見た正面図）であり、上段係止部の正面形状が略たまご形の場合の例である。上段軸部の形状は第１実施形態の上段ずれ止め部材１６の上段軸部１６Ａと同様であるので、図１３においても、上段軸部には符号１６Ａを付している。図１３（ａ）に示す上段係止部３４Ａの正面形状は、上段軸部１６Ａの長手方向と直交する水平方向に長い径の部位が上方に配置されている略たまご形であり、図１３（ｂ）に示す上段係止部３４Ｂの正面形状は、上段軸部１６Ａの長手方向と直交する水平方向に長い径の部位が下方に配置されている略たまご形である。   FIGS. 13A and 13B are specific examples of the second modification of the upper stage locking part 16B of the upper stage locking member 16 of the joint structure 10 according to the first embodiment ((a) the upper stage locking part 34A, (b) the upper stage locking part. 34B) is a front view (a front view seen from the longitudinal direction of the upper shaft portion 16A of the upper shift preventing member 16), and is an example in which the front shape of the upper lock portion is a substantially egg shape. Since the shape of the upper shaft portion is the same as that of the upper shaft portion 16A of the upper shift preventing member 16 of the first embodiment, the upper shaft portion is also denoted by reference numeral 16A in FIG. The front shape of the upper stage locking portion 34A shown in FIG. 13A is a substantially egg shape in which a portion having a long diameter in the horizontal direction perpendicular to the longitudinal direction of the upper stage shaft portion 16A is arranged upward. The front shape of the upper locking portion 34B shown in b) is a substantially egg shape in which a portion having a long diameter in the horizontal direction perpendicular to the longitudinal direction of the upper shaft portion 16A is disposed below.

図１４は、第１実施形態に係る継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例（（ａ）上段係止部３６Ａ、（ｂ）上段係止部３６Ｂ）を示す正面図（上段ずれ止め部材１６の上段軸部１６Ａの長手方向から見た正面図）であり、上段係止部の正面形状が略円形および略楕円形の場合の例である。上段軸部の形状は第１実施形態の上段ずれ止め部材１６の上段軸部１６Ａと同様であるので、図１４においても、上段軸部には符号１６Ａを付している。図１４（ａ）に示す上段係止部３６Ａの正面形状は、上端部が上段軸部１６Ａの上端部と一致する円形であり、図１４（ｂ）に示す上段係止部３６Ｂの正面形状は、上段軸部１６Ａの長手方向と直交する水平方向に長い楕円形である。   14A and 14B are specific examples of the second modification of the upper stage locking portion 16B of the upper stage locking member 16 of the joint structure 10 according to the first embodiment ((a) the upper stage locking portion 36A, (b) the upper stage locking portion. 36B) is a front view (a front view as seen from the longitudinal direction of the upper shaft portion 16A of the upper shift preventing member 16), and is an example in which the front shape of the upper lock portion is approximately circular and approximately elliptical. Since the shape of the upper shaft portion is the same as that of the upper shaft portion 16A of the upper shift preventing member 16 of the first embodiment, the upper shaft portion is also denoted by reference numeral 16A in FIG. The front shape of the upper locking portion 36A shown in FIG. 14 (a) is a circle whose upper end coincides with the upper end of the upper shaft portion 16A, and the front shape of the upper locking portion 36B shown in FIG. 14 (b) is The oval shape is long in the horizontal direction perpendicular to the longitudinal direction of the upper shaft portion 16A.

なお、第１実施形態に係る継ぎ手構造１０の下段ずれ止め部材１８の下段係止部１８Ｂの第２変形例の具体例の正面形状は、図１１〜図１４に示した第１実施形態に係る継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂの第２変形例の具体例を上下反転させた正面形状であるので、図示および説明は省略する。   In addition, the front shape of the specific example of the 2nd modification of the lower stage locking part 18B of the lower stage locking member 18 of the joint structure 10 which concerns on 1st Embodiment concerns on 1st Embodiment shown in FIGS. Since the specific example of the 2nd modification of the upper stage latching | locking part 16B of the upper stage latching member 16 of the joint structure 10 is turned upside down, illustration and description are abbreviate | omitted.

（第２実施形態）
図１５は、本発明の第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０を斜め上方から見た斜視図であり、図１６は、図１５から上段直交鉄筋２０および下段直交鉄筋２２を除いて描いた斜視図であり、図１７は、本発明の第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０を橋軸直角方向から見た側面図である。ただし、図示の都合上、図１５および図１６においては、間詰めコンクリート２４は描いていない。また、図１７では、間詰めコンクリート２４の内部の部材も実線で描いている。また、本発明の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０と同様の構成については同一の符号を付して説明は原則として省略する。また、第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０において説明した内容のうち、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０においても同様に当てはまる内容については、原則として説明を省略する。 (Second Embodiment)
FIG. 15 is a perspective view of the joint structure 40 of the precast concrete floor slab according to the second embodiment of the present invention viewed obliquely from above, and FIG. 16 excludes the upper and lower orthogonal reinforcing bars 20 and 22 from FIG. FIG. 17 is a side view of the joint structure 40 of the precast concrete floor slab according to the second embodiment of the present invention as viewed from the direction perpendicular to the bridge axis. However, for the sake of illustration, the interstitial concrete 24 is not drawn in FIGS. 15 and 16. Moreover, in FIG. 17, the member inside the interstitial concrete 24 is also drawn with the continuous line. Moreover, about the structure similar to the joint structure 10 of the precast concrete floor slab which concerns on 1st Embodiment of this invention, the same code | symbol is attached | subjected and description is abbreviate | omitted in principle. In addition, among the contents described in the joint structure 10 of the precast concrete floor slab according to the first embodiment, the same applies to the joint structure 40 of the precast concrete floor slab according to the second embodiment in principle. Is omitted.

上段継ぎ手鉄筋１２の先端には、上段ずれ止め部材４２が設けられている。図１８は、上段継ぎ手鉄筋１２の先端部および上段ずれ止め部材４２を上段継ぎ手鉄筋１２の中心軸１２Ａを通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図である。   An upper slip prevention member 42 is provided at the tip of the upper joint rebar 12. FIG. 18 is a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the upper joint rebar 12 and the upper shift preventing member 42 with a vertical plane passing through the central axis 12A of the upper joint rebar 12.

図１８に示すように、上段ずれ止め部材４２は、上段軸部４２Ａと、上段係止部４２Ｂとを有してなる。上段軸部４２Ａと上段係止部４２Ｂとは一体化されている。   As shown in FIG. 18, the upper slip prevention member 42 includes an upper shaft portion 42A and an upper latch portion 42B. The upper shaft portion 42A and the upper locking portion 42B are integrated.

第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０の上段ずれ止め部材１６の上段係止部１６Ｂは、上段係止部１６Ｂを有する上段ずれ止め部材１６が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の方向に斜め下方に延びる上段内面１６Ｂ１を、当該上段継ぎ手鉄筋１２が突出する方向とは逆の側に有していたが、図１８に示すように、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０の上段係止部４２Ｂは、上段係止部４２Ｂを有する上段ずれ止め部材４２が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の方向に斜め下方に延びる面（第１実施形態に係る継ぎ手構造１０における上段内面１６Ｂ１）は有しておらず、代わりに、当該上段継ぎ手鉄筋１２の長手方向と略直交するように下方に延びる上段直交内面４２Ｂ１を当該上段継ぎ手鉄筋１２の突出する方向とは逆の側に有している。   The upper stage locking member 16B of the upper stage locking member 16 of the joint structure 10 of the precast concrete floor slab according to the first embodiment includes the upper stage joint reinforcing bar 12 provided with the upper stage locking member 16 having the upper stage locking unit 16B. Although the upper inner surface 16B1 extending obliquely downward in the direction opposite to the projecting direction is provided on the side opposite to the direction in which the upper joint rebar 12 projects, the second embodiment as shown in FIG. The upper stage locking part 42B of the joint structure 40 of the precast concrete floor slab according to the configuration is in a direction opposite to the direction in which the upper stage joint reinforcing bar 12 provided with the upper stage locking member 42 having the upper stage locking part 42B is projected. The surface extending obliquely downward (the upper inner surface 16B1 in the joint structure 10 according to the first embodiment) is not provided, but is substantially orthogonal to the longitudinal direction of the upper joint rebar 12 instead. It has the opposite side of the upper orthogonal inner surface 42B1 extending downward and the projecting direction of the upper joint reinforcement 12 so that.

また、下段継ぎ手鉄筋１４の先端には、下段ずれ止め部材４４が設けられている。図１９は、下段継ぎ手鉄筋１４の先端部および下段ずれ止め部材４４を下段継ぎ手鉄筋１４の中心軸１４Ａを通る鉛直面で切断して得られる断面を模式的に示す鉛直断面図である。   Further, a lower-stage detent member 44 is provided at the tip of the lower joint rebar 14. FIG. 19 is a vertical cross-sectional view schematically showing a cross section obtained by cutting the distal end portion of the lower joint rebar 14 and the lower shift preventing member 44 along a vertical plane passing through the central axis 14A of the lower joint rebar 14.

図１９に示すように、下段ずれ止め部材４４は、下段軸部４４Ａと、下段係止部４４Ｂとを有してなる。下段軸部４４Ａと下段係止部４４Ｂとは一体化されている。   As shown in FIG. 19, the lower-stage slip prevention member 44 includes a lower-stage shaft portion 44A and a lower-stage locking portion 44B. The lower shaft portion 44A and the lower locking portion 44B are integrated.

第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０の下段ずれ止め部材１８の下段係止部１８Ｂは、下段係止部１８Ｂを有する下段ずれ止め部材１８が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の方向に斜め上方に延びる下段内面１８Ｂ１を、当該下段継ぎ手鉄筋１４が突出する方向とは逆の側に有していたが、図１９に示すように、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０の下段係止部４４Ｂは、下段係止部４４Ｂを有する下段ずれ止め部材４４が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の方向に斜め上方に延びる面（第１実施形態に係る継ぎ手構造１０における下段内面１８Ｂ１）は有しておらず、代わりに、当該下段継ぎ手鉄筋１４の長手方向と略直交するように上方に延びる下段直交内面４４Ｂ１を当該下段継ぎ手鉄筋１４の突出する方向とは逆の側に有している。   The lower-stage locking member 18B of the lower-stage locking member 18 of the precast concrete floor slab joint structure 10 according to the first embodiment includes a lower-level joint reinforcing bar 14 provided with a lower-level locking member 18 having a lower-level locking part 18B. Although the lower inner surface 18B1 extending obliquely upward in the direction opposite to the projecting direction is provided on the side opposite to the direction in which the lower joint rebar 14 projects, the second embodiment as shown in FIG. The lower stage locking portion 44B of the joint structure 40 of the precast concrete floor slab according to the configuration is in a direction opposite to the direction in which the lower joint reinforcing bar 14 provided with the lower stage stopper member 44 having the lower stage locking portion 44B protrudes. The surface extending obliquely upward (the lower inner surface 18B1 in the joint structure 10 according to the first embodiment) is not provided, but instead is substantially orthogonal to the longitudinal direction of the lower joint rebar 14. It has the opposite side of the lower orthogonal inner surface 44B1 extending upwardly direction to protrude in the lower joint reinforcement 14 so that.

以上説明したように、上段内面１６Ｂ１に替えて、上段継ぎ手鉄筋１２の長手方向と略直交するように下方に延びる上段直交内面４２Ｂ１を有し、下段内面１８Ｂ１に替えて、下段継ぎ手鉄筋１４の長手方向と略直交するように上方に延びる下段直交内面４４Ｂ１を有している点が、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０の第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０との大きな相違点である。   As described above, in place of the upper inner surface 16B1, the upper joint inner reinforcing surface 14 has the upper orthogonal inner surface 42B1 that extends downward so as to be substantially orthogonal to the longitudinal direction of the upper joint reinforcing bar 12, and instead of the lower inner surface 18B1, the length of the lower joint reinforcing bar 14 is increased. The joint of the precast concrete floor slab according to the first embodiment of the joint structure 40 of the precast concrete floor slab according to the second embodiment is that it has a lower orthogonal inner surface 44B1 extending upward so as to be substantially orthogonal to the direction. This is a major difference from the structure 10.

上段ずれ止め部材４２は、上段直交内面４２Ｂ１を備えることにより、上段直交内面４２Ｂ１が支圧抵抗面となって、上段継ぎ手鉄筋１２が間詰めコンクリート２４から引き抜けることを防止し、下段ずれ止め部材４４は、下段直交内面４４Ｂ１を備えることにより、下段直交内面４４Ｂ１が支圧抵抗面となって、下段継ぎ手鉄筋１４が間詰めコンクリート２４から引き抜けることを防止する。   By providing the upper-stage orthogonal inner surface 42B1 with the upper-stage shift preventing member 42, the upper-stage orthogonal inner surface 42B1 serves as a bearing resistance surface to prevent the upper-stage joint rebar 12 from being pulled out from the interstitial concrete 24, and the lower-stage shift preventing member 44 Since the lower-stage orthogonal inner surface 44B1 is provided, the lower-stage orthogonal inner surface 44B1 serves as a bearing resistance resistance surface, and the lower joint reinforcing bar 14 is prevented from being pulled out from the interstitial concrete 24.

また、上段係止部４２Ｂを側方（橋軸直角方向）から見た形状はくさび型であり、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０の上段係止部４２Ｂの上段直交内面４２Ｂ１とは反対側（上段係止部４２Ｂを有する上段ずれ止め部材４２が設けられている上段継ぎ手鉄筋１２が突出する方向の側）の上段外面４２Ｂ２は、上段係止部４２Ｂを有する上段ずれ止め部材４２が設けられている上段継ぎ手鉄筋１２が突出する方向に斜め下方に延びる面になっている。このため、上段継ぎ手鉄筋１２が上方にはらみ出そうとするときに、上段外面４２Ｂ２は間詰めコンクリート２４からの抵抗力を受けるため、上段継ぎ手鉄筋１２の上方へのはらみ出しが起こりにくくなっている。   The shape of the upper locking portion 42B viewed from the side (in the direction perpendicular to the bridge axis) is a wedge shape, and the upper locking portion 42B of the joint structure 40 of the precast concrete slab according to the second embodiment is orthogonal to the upper stage. The upper outer surface 42B2 on the side opposite to the inner surface 42B1 (the side in the direction in which the upper joint rebar 12 having the upper locking member 42 having the upper locking portion 42B protrudes) is the upper shift having the upper locking portion 42B. The upper joint rebar 12 provided with the stop member 42 is a surface extending obliquely downward in the protruding direction. For this reason, when the upper joint rebar 12 tries to protrude upward, the upper outer surface 42B2 receives a resistance force from the interstitial concrete 24, so that the upper joint rebar 12 does not easily protrude upward. .

また、下段係止部４４Ｂを側方（橋軸直角方向）から見た形状はくさび型であり、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０の下段係止部４４Ｂの下段直交内面４４Ｂ１とは反対側（下段係止部４４Ｂを有する下段ずれ止め部材４４が設けられている下段継ぎ手鉄筋１４が突出する方向の側）の下段外面４４Ｂ２は、下段係止部４４Ｂを有する下段ずれ止め部材４４が設けられている下段継ぎ手鉄筋１４が突出する方向に斜め上方に延びる面になっている。このため、下段継ぎ手鉄筋１４が下方にはらみ出そうとするときに、下段外面４４Ｂ２は間詰めコンクリート２４からの抵抗力を受けるため、下段継ぎ手鉄筋１４の下方へのはらみ出しが起こりにくくなっている。   The shape of the lower locking portion 44B viewed from the side (in the direction perpendicular to the bridge axis) is a wedge shape, and the lower locking portion 44B of the lower locking portion 44B of the precast concrete slab joint structure according to the second embodiment is orthogonal to the lower step. The lower outer surface 44B2 on the side opposite to the inner surface 44B1 (the side in the direction in which the lower joint reinforcing bar 14 provided with the lower shift preventing member 44 having the lower locking portion 44B protrudes) is the lower shift having the lower locking portion 44B. It is a surface that extends obliquely upward in the direction in which the lower joint rebar 14 provided with the stop member 44 projects. For this reason, when the lower joint rebar 14 attempts to protrude downward, the lower outer surface 44B2 receives a resistance force from the interstitial concrete 24, so that the lower joint reinforcing bar 14 does not easily protrude downward. .

ただし、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０の上段ずれ止め部材４２の上段係止部４２Ｂは、上段係止部４２Ｂを有する上段ずれ止め部材４２が設けられている上段継ぎ手鉄筋１２が突出する方向とは逆の方向に斜め下方に延びる面（第１実施形態に係る継ぎ手構造１０における上段内面１６Ｂ１）を、当該上段継ぎ手鉄筋１２が突出する方向とは逆の側に有しておらず、代わりに、上段継ぎ手鉄筋１２の長手方向と略直交するように下方に延びる上段直交内面４２Ｂ１を、当該上段継ぎ手鉄筋１２が突出する方向とは逆の側に有しており、また、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０の下段ずれ止め部材４４の下段係止部４４Ｂは、下段係止部４４Ｂを有する下段ずれ止め部材４４が設けられている下段継ぎ手鉄筋１４が突出する方向とは逆の方向に斜め上方に延びる面（第１実施形態に係る継ぎ手構造１０における下段内面１８Ｂ１）を、当該下段継ぎ手鉄筋１４が突出する方向とは逆の側に有しておらず、代わりに、下段継ぎ手鉄筋１４の長手方向と略直交するように上方に延びる下段直交内面４４Ｂ１を、当該下段継ぎ手鉄筋１４が突出する方向とは逆の側に有しているので、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０は、第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０よりも、間詰めコンクリート２４に係止する効果が小さくなると思われる。   However, the upper stage locking portion 42B of the upper stage locking member 42 of the joint structure 40 of the precast concrete floor slab according to the second embodiment is an upper stage joint provided with an upper stage locking member 42 having an upper stage locking portion 42B. A surface (upper inner surface 16B1 in the joint structure 10 according to the first embodiment) extending obliquely downward in a direction opposite to the direction in which the reinforcing bar 12 protrudes is provided on the side opposite to the direction in which the upper connecting reinforcing bar 12 protrudes. Instead, it has an upper orthogonal inner surface 42B1 extending downward so as to be substantially orthogonal to the longitudinal direction of the upper joint rebar 12 on the side opposite to the direction in which the upper joint rebar 12 protrudes, Further, the lower-stage locking member 44B of the lower-stage locking member 44 of the joint structure 40 of the precast concrete floor slab according to the second embodiment includes a lower-stage locking part having a lower-level locking part 44B. The lower joint rebar 14 protrudes from a surface (lower inner surface 18B1 in the joint structure 10 according to the first embodiment) extending obliquely upward in a direction opposite to the direction in which the lower joint rebar 14 in which the member 44 is provided protrudes. Instead, the lower joint inner reinforcing surface 14B1 extending upward so as to be substantially perpendicular to the longitudinal direction of the lower joint rebar 14 is defined as the direction in which the lower joint rebar 14 protrudes. Since the joint structure 40 of the precast concrete floor slab according to the second embodiment is engaged with the interstitial concrete 24 rather than the joint structure 10 of the precast concrete floor slab according to the first embodiment. It seems that the effect of stopping becomes smaller.

なお、上段ずれ止め部材４２の上段軸部４２Ａは、上段継ぎ手鉄筋１２の外径（凹部の外径）と略同一の外径を有しており、突出する上段継ぎ手鉄筋１２の先端に、お互いの中心軸が略一致するように接合されている。この接合は、例えば、フラッシュ溶接を用いて行うことができる。フラッシュ溶接を用いて得られる接合部は接合前よりも若干径が大きくなるが、上段継ぎ手鉄筋１２の凸部の径程度以下に抑えることで、フラッシュ溶接を用いて得られる接合部は上段継ぎ手鉄筋１２と同等のかぶりを確保できる。   The upper shaft portion 42A of the upper shift stopper 42 has an outer diameter that is substantially the same as the outer diameter of the upper joint rebar 12 (the outer diameter of the recess). Are joined so that their central axes substantially coincide. This joining can be performed using flash welding, for example. The joint obtained by flash welding has a slightly larger diameter than before the joining, but the joint obtained by flash welding can be obtained by suppressing the diameter to the extent of the convex portion of the upper joint rebar 12 or less. A cover equivalent to 12 can be secured.

また、下段ずれ止め部材４４の下段軸部４４Ａは、下段継ぎ手鉄筋１４の外径（凹部の外径）と略同一の外径を有しており、突出する下段継ぎ手鉄筋１４の先端に、お互いの中心軸が略一致するように接合されている。この接合は、例えば、フラッシュ溶接を用いて行うことができる。フラッシュ溶接を用いて得られる接合部は接合前よりも若干径が大きくなるが、下段継ぎ手鉄筋１４の凸部の径程度以下に抑えることで、フラッシュ溶接を用いて得られる接合部は下段継ぎ手鉄筋１４と同等のかぶりを確保できる。   Further, the lower shaft portion 44A of the lower slip stopper 44 has an outer diameter substantially the same as the outer diameter of the lower joint rebar 14 (the outer diameter of the concave portion). Are joined so that their central axes substantially coincide. This joining can be performed using flash welding, for example. The joint obtained by flash welding has a slightly larger diameter than before the joining, but the joint obtained by flash welding has a lower joint rebar by suppressing it to about the diameter of the convex portion of the lower joint rebar 14. A cover equivalent to 14 can be secured.

なお、本第２実施形態に係るプレキャストコンクリート床版の継ぎ手構造４０の上段ずれ止め部材４２および下段ずれ止め部材４４の正面形状としては、第１実施形態に係るプレキャストコンクリート床版の継ぎ手構造１０で説明した図１１〜図１４と同様に種々の形状を採用することが可能である。   In addition, as the front shape of the upper-stage shift preventing member 42 and the lower-stage shift preventing member 44 of the joint structure 40 of the precast concrete floor slab according to the second embodiment, the joint structure 10 of the precast concrete floor slab according to the first embodiment is used. Various shapes can be adopted in the same manner as in FIGS.

１０、４０…プレキャストコンクリート床版の継ぎ手構造
１２…上段継ぎ手鉄筋
１２Ａ、１４Ａ…中心軸
１４…下段継ぎ手鉄筋
１６、２６、４２…上段ずれ止め部材
１６Ａ、２６Ａ、４２Ａ…上段軸部
１６Ｂ、２６Ｂ、４２Ｂ…上段係止部
１６Ｂ１、２６Ｂ１…上段内面
１６Ｂ２、２６Ｂ２、４２Ｂ２…上段外面
１８、２８、４４…下段ずれ止め部材
１８Ａ、２８Ａ、４４Ａ…下段軸部
１８Ｂ、２８Ｂ、４４Ｂ…下段係止部
１８Ｂ１、２８Ｂ１…下段内面
１８Ｂ２、２８Ｂ２、４４Ｂ２…下段外面
２０…上段直交鉄筋
２２…下段直交鉄筋
２３…針金
２４…間詰めコンクリート
３０Ａ、３０Ｂ、３２Ａ、３２Ｂ、３２Ｃ、３４Ａ、３４Ｂ、３６Ａ、３６Ｂ…上段係止部
４２Ｂ１…上段直交内面
４４Ｂ１…下段直交内面
５０…プレキャストコンクリート床版
５２…接合端面 DESCRIPTION OF SYMBOLS 10, 40 ... Joint structure of precast concrete floor slab 12 ... Upper joint rebar 12A, 14A ... Center axis 14 ... Lower joint rebar 16, 26, 42 ... Upper stage slip prevention member 16A, 26A, 42A ... Upper stage shaft part 16B, 26B, 42B: Upper stage locking portion 16B1, 26B1 ... Upper stage inner surface 16B2, 26B2, 42B2 ... Upper stage outer surface 18, 28, 44 ... Lower stage locking member 18A, 28A, 44A ... Lower stage shaft part 18B, 28B, 44B ... Lower stage locking part 18B1 , 28B1 ... Lower inner surface 18B2, 28B2, 44B2 ... Lower outer surface 20 ... Upper orthogonal reinforcing bar 22 ... Lower orthogonal reinforcing bar 23 ... Wire 24 ... Filled concrete 30A, 30B, 32A, 32B, 32C, 34A, 34B, 36A, 36B ... Upper Locking part 42B1 ... Upper orthogonal inner surface 44B1 ... Lower orthogonal inner surface 50 ... Pre Turbocharger strike concrete floor slab 52 ... joining end face

Claims (8)

プレキャストコンクリート床版の側端部の接合端面に上下に間隔を開けて埋め込まれていて、前記接合端面から前記プレキャストコンクリート床版の床板面と略平行な方向に突出するように配置されている上段継ぎ手鉄筋および下段継ぎ手鉄筋と、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記接合端面同士の間を充填する間詰め材と、を有していて、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版同士を接続するプレキャストコンクリート床版の継ぎ手構造であって、
前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記上段継ぎ手鉄筋同士は、略同一の高さ位置に所定の間隔を開けて配置されており、
前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記下段継ぎ手鉄筋同士は、略同一の高さ位置に所定の間隔を開けて配置されており、
突出する前記上段継ぎ手鉄筋の先端には、上段ずれ止め部材がそれぞれ設けられており、
前記上段ずれ止め部材は、突出する前記上段継ぎ手鉄筋の先端にお互いの中心軸が略一致するように接合された上段軸部と、自身が接合された前記上段継ぎ手鉄筋の長手方向と直交する水平方向から見て、当該上段継ぎ手鉄筋が突出する方向とは逆の方向に斜め下方に延びる上段内面を当該上段継ぎ手鉄筋の突出する方向とは逆の側に有する上段係止部と、を有してなり、
前記上段軸部と前記上段係止部とは一体化されており、
突出する前記下段継ぎ手鉄筋の先端には、下段ずれ止め部材がそれぞれ設けられており、
前記下段ずれ止め部材は、突出する前記下段継ぎ手鉄筋の先端にお互いの中心軸が略一致するように接合された下段軸部と、自身が接合された前記下段継ぎ手鉄筋の長手方向と直交する水平方向から見て、当該下段継ぎ手鉄筋が突出する方向とは逆の方向に斜め上方に延びる下段内面を当該下段継ぎ手鉄筋の突出する方向とは逆の側に有する下段係止部と、を有してなり、
前記下段軸部と前記下段係止部とは一体化されており、
さらに、前記上段継ぎ手鉄筋の下方に隣接して配置されていて前記上段継ぎ手鉄筋の長手方向と略直交する略水平方向に延びる上段直交鉄筋が前記上段係止部同士の間に配置されており、
前記下段継ぎ手鉄筋の上方に隣接して配置されていて前記下段継ぎ手鉄筋の長手方向と略直交する略水平方向に延びる下段直交鉄筋が前記下段係止部同士の間に配置されており、
前記プレキャストコンクリート床版の前記接合端面から突出している前記上段継ぎ手鉄筋の部位、前記プレキャストコンクリート床版の前記接合端面から突出している前記下段継ぎ手鉄筋の部位、前記上段ずれ止め部材、前記下段ずれ止め部材、前記上段直交鉄筋、および前記下段直交鉄筋の周囲は、前記間詰め材に覆われていることを特徴とするプレキャストコンクリート床版の継ぎ手構造。 The upper stage which is embedded in the joint end surface of the side end portion of the precast concrete floor slab with a space in the vertical direction and is arranged so as to protrude from the joint end surface in a direction substantially parallel to the floor plate surface of the precast concrete floor slab. A joint reinforcing bar and a lower joint reinforcing bar, and a filling material for filling a space between the joint end faces of the precast concrete floor slab arranged so that the joint end faces face each other, and the joint end face is A joint structure of precast concrete floor slabs connecting the precast concrete floor slabs arranged to face each other,
The upper joint rebars of the precast concrete floor slabs arranged so that the joining end faces face each other are arranged at substantially the same height position with a predetermined interval,
The lower joint reinforcing bars of the precast concrete floor slabs arranged so that the joint end faces face each other are arranged at predetermined intervals at substantially the same height position,
At the tip of the protruding upper joint reinforcing bar, an upper slip prevention member is provided, respectively.
The upper-stage detent member includes an upper shaft portion joined so that the central axes of the upper-stage joint reinforcing bars are substantially coincided with each other, and a horizontal direction perpendicular to the longitudinal direction of the upper joint reinforcing bar to which the upper-stage displacement preventing member is joined. An upper locking portion having an upper inner surface extending obliquely downward in a direction opposite to the direction in which the upper joint reinforcing bar protrudes from the direction opposite to the direction in which the upper joint reinforcing bar protrudes. And
The upper shaft portion and the upper locking portion are integrated,
At the tip of the protruding lower joint rebar, a lower slip prevention member is provided,
The lower-stage detent member includes a lower-stage shaft portion joined so that the central axes of the lower-stage joint reinforcing bars substantially coincide with each other, and a horizontal direction perpendicular to the longitudinal direction of the lower-joint reinforcing bar to which the lower-stage slip prevention member is joined. A lower locking portion having a lower inner surface extending obliquely upward in a direction opposite to the direction in which the lower joint reinforcing bar protrudes from the direction opposite to the direction in which the lower joint reinforcing bar protrudes. And
The lower shaft portion and the lower locking portion are integrated,
Further, an upper orthogonal reinforcing bar that is arranged adjacent to the lower part of the upper joint reinforcing bar and extends in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the upper joint reinforcing bar is arranged between the upper locking portions.
A lower orthogonal reinforcing bar that is disposed adjacent to and above the lower joint reinforcing bar and extends in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the lower joint reinforcing bar is disposed between the lower locking portions;
The portion of the upper joint reinforcing bar protruding from the joint end surface of the precast concrete floor slab, the portion of the lower joint reinforcing bar protruding from the joint end surface of the precast concrete floor slab, the upper stage detent member, the lower stage detent member The joint structure of the precast concrete floor slab, wherein the periphery of the member, the upper orthogonal reinforcing bar, and the lower orthogonal reinforcing bar is covered with the padding material. 前記上段継ぎ手鉄筋の中心軸を含む鉛直面で切断した切断面において、当該上段継ぎ手鉄筋に接合されている前記上段ずれ止め部材の前記上段係止部の前記上段内面の当該上段継ぎ手鉄筋の中心軸とのなす角は４５°以上８５°以下であり、前記下段継ぎ手鉄筋の中心軸を含む鉛直面で切断した切断面において、当該下段継ぎ手鉄筋に接合されている前記下段ずれ止め部材の前記下段係止部の前記下段内面の当該下段継ぎ手鉄筋の中心軸とのなす角は４５°以上８５°以下であることを特徴とする請求項１に記載のプレキャストコンクリート床版の継ぎ手構造。   A central axis of the upper joint reinforcing bar of the upper inner surface of the upper locking portion of the upper shift preventing member joined to the upper joint reinforcing bar in a cut surface cut along a vertical plane including the central axis of the upper joint reinforcing bar The lower-stage engagement member of the lower-stage detent member joined to the lower-joint reinforcing bar at a cut surface cut by a vertical plane including the central axis of the lower-joint reinforcing bar is 45 ° to 85 °. The joint structure of the precast concrete slab according to claim 1, wherein an angle between the lower inner surface of the stopper and the central axis of the lower joint reinforcing bar is 45 ° or more and 85 ° or less. プレキャストコンクリート床版の側端部の接合端面に上下に間隔を開けて埋め込まれていて、前記接合端面から前記プレキャストコンクリート床版の床板面と略平行な方向に突出するように配置されている上段継ぎ手鉄筋および下段継ぎ手鉄筋と、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記接合端面同士の間を充填する間詰め材と、を有していて、前記接合端面が対向するように配置されている前記プレキャストコンクリート床版同士を接続するプレキャストコンクリート床版の継ぎ手構造であって、
前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記上段継ぎ手鉄筋同士は、略同一の高さ位置に所定の間隔を開けて配置されており、
前記接合端面が対向するように配置されている前記プレキャストコンクリート床版の前記下段継ぎ手鉄筋同士は、略同一の高さ位置に所定の間隔を開けて配置されており、
突出する前記上段継ぎ手鉄筋の先端には、上段ずれ止め部材がそれぞれ設けられており、
前記上段ずれ止め部材は、突出する前記上段継ぎ手鉄筋の先端にお互いの中心軸が略一致するように接合された上段軸部と、当該上段継ぎ手鉄筋の長手方向と略直交するように下方に延びる上段直交内面を当該上段継ぎ手鉄筋の突出する方向とは逆の側に有する上段係止部と、を有してなり、
前記上段軸部と前記上段係止部とは一体化されており、
突出する前記下段継ぎ手鉄筋の先端には、下段ずれ止め部材がそれぞれ設けられており、
前記下段ずれ止め部材は、突出する前記下段継ぎ手鉄筋の先端にお互いの中心軸が略一致するように接合された下段軸部と、当該下段継ぎ手鉄筋の長手方向と略直交するように上方に延びる下段直交内面を当該下段継ぎ手鉄筋の突出する方向とは逆の側に有する下段係止部と、を有してなり、
前記下段軸部と前記下段係止部とは一体化されており、
さらに、前記上段継ぎ手鉄筋の下方に隣接して配置されていて前記上段継ぎ手鉄筋の長手方向と略直交する略水平方向に延びる上段直交鉄筋が前記上段係止部同士の間に配置されており、
前記下段継ぎ手鉄筋の上方に隣接して配置されていて前記下段継ぎ手鉄筋の長手方向と略直交する略水平方向に延びる下段直交鉄筋が前記下段係止部同士の間に配置されており、
前記プレキャストコンクリート床版の前記接合端面から突出している前記上段継ぎ手鉄筋の部位、前記プレキャストコンクリート床版の前記接合端面から突出している前記下段継ぎ手鉄筋の部位、前記上段ずれ止め部材、前記下段ずれ止め部材、前記上段直交鉄筋、および前記下段直交鉄筋の周囲は、前記間詰め材に覆われていることを特徴とするプレキャストコンクリート床版の継ぎ手構造。 The upper stage which is embedded in the joint end surface of the side end portion of the precast concrete floor slab with a space in the vertical direction and is arranged so as to protrude from the joint end surface in a direction substantially parallel to the floor plate surface of the precast concrete floor slab. A joint reinforcing bar and a lower joint reinforcing bar, and a filling material for filling a space between the joint end faces of the precast concrete floor slab arranged so that the joint end faces face each other, and the joint end face is A joint structure of precast concrete floor slabs connecting the precast concrete floor slabs arranged to face each other,
The upper joint rebars of the precast concrete floor slabs arranged so that the joining end faces face each other are arranged at substantially the same height position with a predetermined interval,
The lower joint reinforcing bars of the precast concrete floor slabs arranged so that the joint end faces face each other are arranged at predetermined intervals at substantially the same height position,
At the tip of the protruding upper joint reinforcing bar, an upper slip prevention member is provided, respectively.
The upper-stage detent member extends downwardly so as to be substantially orthogonal to the longitudinal direction of the upper joint rebar, and an upper shaft portion joined so that the central axes of the upper joint rebars are substantially coincident with each other. An upper locking portion having the upper orthogonal inner surface on the side opposite to the direction in which the upper joint reinforcing bar protrudes,
The upper shaft portion and the upper locking portion are integrated,
At the tip of the protruding lower joint rebar, a lower slip prevention member is provided,
The lower-stage detent member extends upward so as to be substantially perpendicular to the longitudinal direction of the lower joint rebar, and a lower shaft portion joined so that the center axes of the lower joint rebars are substantially coincident with each other. A lower locking portion having a lower orthogonal inner surface on a side opposite to a direction in which the lower joint reinforcing bar protrudes,
The lower shaft portion and the lower locking portion are integrated,
Further, an upper orthogonal reinforcing bar that is arranged adjacent to the lower part of the upper joint reinforcing bar and extends in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the upper joint reinforcing bar is arranged between the upper locking portions.
A lower orthogonal reinforcing bar that is disposed adjacent to and above the lower joint reinforcing bar and extends in a substantially horizontal direction substantially orthogonal to the longitudinal direction of the lower joint reinforcing bar is disposed between the lower locking portions;
The portion of the upper joint reinforcing bar protruding from the joint end surface of the precast concrete floor slab, the portion of the lower joint reinforcing bar protruding from the joint end surface of the precast concrete floor slab, the upper stage detent member, the lower stage detent member The joint structure of the precast concrete floor slab, wherein the periphery of the member, the upper orthogonal reinforcing bar, and the lower orthogonal reinforcing bar is covered with the padding material. 前記上段ずれ止め部材には、自身が接合されている前記上段継ぎ手鉄筋の上縁よりも上方に位置する部位はなく、前記下段ずれ止め部材には、自身が接合されている前記下段継ぎ手鉄筋の下縁よりも下方に位置する部位はないことを特徴とする請求項１〜３のいずれかに記載のプレキャストコンクリート床版の継ぎ手構造。   The upper slip prevention member does not have a portion positioned above the upper edge of the upper joint rebar to which it is joined, and the lower slip restraining member has the part of the lower joint rebar to which it is joined. The joint structure for a precast concrete slab according to any one of claims 1 to 3, wherein there is no portion located below the lower edge. 前記上段係止部および前記下段係止部の形状は、板状であることを特徴とする請求項１〜４のいずれかに記載のプレキャストコンクリート床版の継ぎ手構造。   The joint structure of the precast concrete floor slab according to any one of claims 1 to 4, wherein the upper locking portion and the lower locking portion are plate-shaped. 前記上段ずれ止め部材の前記上段係止部は、該上段ずれ止め部材が接合されている上段継ぎ手鉄筋が突出する方向の側に、自身が接合された前記上段継ぎ手鉄筋の長手方向と直交する水平方向から見て、該上段継ぎ手鉄筋が突出する方向に斜め下方に延びる上段外面を有しており、前記下段ずれ止め部材の前記下段係止部は、該下段ずれ止め部材が接合されている下段継ぎ手鉄筋が突出する方向の側に、自身が接合された前記下段継ぎ手鉄筋の長手方向と直交する水平方向から見て、該下段継ぎ手鉄筋が突出する方向に斜め上方に延びる下段外面を有していることを特徴とする請求項１〜４のいずれかに記載のプレキャストコンクリート床版の継ぎ手構造。   The upper-stage locking portion of the upper-stage detent member is arranged in a horizontal direction perpendicular to the longitudinal direction of the upper-stage joint reinforcing bar to which the upper-stage detent member is joined, on the side in the direction in which the upper-stage joint rebar is joined. As viewed from the direction, it has an upper outer surface that extends obliquely downward in the direction in which the upper joint reinforcing bar protrudes, and the lower locking portion of the lower locking member is a lower stage to which the lower locking member is joined. A lower outer surface extending obliquely upward in a direction in which the lower joint reinforcing bar protrudes when viewed from a horizontal direction orthogonal to the longitudinal direction of the lower joint reinforcing bar to which the lower reinforcing bar is joined, on the side in which the joint reinforcing bar protrudes. The joint structure of a precast concrete slab according to any one of claims 1 to 4, wherein 前記上段ずれ止め部材は鋳鉄または鋳鋼で一体的に形成されており、前記下段ずれ止め部材は鋳鉄または鋳鋼で一体的に形成されていることを特徴とする請求項１〜６のいずれかに記載のプレキャストコンクリート床版の継ぎ手構造。   The said upper stage slip prevention member is integrally formed with cast iron or cast steel, and the said lower stage slip prevention member is integrally formed with cast iron or cast steel. Joint structure of precast concrete floor slab. 前記上段ずれ止め部材の前記上段軸部は、突出する前記上段継ぎ手鉄筋の前記先端にフラッシュ溶接で接合されており、前記下段ずれ止め部材の前記下段軸部は、突出する前記下段継ぎ手鉄筋の前記先端にフラッシュ溶接で接合されていることを特徴とする請求項１〜７のいずれかに記載のプレキャストコンクリート床版の継ぎ手構造。   The upper shaft portion of the upper shift prevention member is joined to the tip of the protruding upper joint rebar by flash welding, and the lower shaft portion of the lower shift prevention member is the protrusion of the lower joint reinforcing rod. The joint structure for precast concrete slabs according to any one of claims 1 to 7, wherein the joint structure is joined to the tip by flash welding.
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