JP2020193481A - Joint structure of concrete precast floor slab and joint structure of concrete precast member - Google Patents

Joint structure of concrete precast floor slab and joint structure of concrete precast member Download PDF

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JP2020193481A
JP2020193481A JP2019099507A JP2019099507A JP2020193481A JP 2020193481 A JP2020193481 A JP 2020193481A JP 2019099507 A JP2019099507 A JP 2019099507A JP 2019099507 A JP2019099507 A JP 2019099507A JP 2020193481 A JP2020193481 A JP 2020193481A
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joint
concrete precast
floor slab
precast floor
female joint
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JP7254289B2 (en
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均 浅野
Hitoshi Asano
均 浅野
毅 柳楽
Takeshi Nagira
毅 柳楽
関口 高志
Takashi Sekiguchi
高志 関口
美由紀 加藤
Miyuki Kato
美由紀 加藤
慎也 北原
Shinya Kitahara
慎也 北原
幸嗣 可児
Yukitsugu Kani
幸嗣 可児
田中 徹
Toru Tanaka
徹 田中
英紀 大橋
Hidenori Ohashi
英紀 大橋
奥村 正樹
Masaki Okumura
正樹 奥村
松井 繁之
Shigeyuki Matsui
繁之 松井
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CALAMITY SCIENCE INSTITUTE
Toda Corp
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Toda Corp
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Abstract

To provide a mechanical joint structure of a concrete precast floor slab in which vertical grooves are prevented from being deformed in a female joint having a groove-shaped cross section.SOLUTION: A female joint 3 of a precast floor slab 1A on one side is engaged with a male joint 4 of a precast floor slab 1B on an other side. With the precast floor slabs connected to each other, a grout material 17 is filled in an internal space IS of the female joint 3, an upper space US of the female joint 3, and a gap part M between the precast floor slab 1A on one side and the precast floor slab 1B on the other side. Opening prevention reinforcement bars 15 extending in a direction parallel to bridge axial direction reinforcement bars 12 are arranged on both sides of the female joint 3 at a prescribed distance from the female joint 3.SELECTED DRAWING: Figure 3

Description

本発明は、橋梁などに用いられるコンクリート製プレキャスト床版同士を接合するための継手構造及びコンクリート製プレキャスト部材の継手構造に関する。 The present invention relates to a joint structure for joining concrete precast floor slabs used for bridges and the like and a joint structure of concrete precast members.

従来より、橋梁などの床版取替え工事では、工期の短縮を図るために工場や現場ヤードなどで製作されたコンクリート製プレキャスト床版が用いられている。このコンクリート製プレキャスト床版同士を接続する継手構造としては、従来から種々の構造のものが提案され実用化されている。 Conventionally, in the floor slab replacement work for bridges and the like, concrete precast floor slabs manufactured in factories and site yards have been used in order to shorten the construction period. As a joint structure for connecting the concrete precast floor slabs to each other, various structures have been proposed and put into practical use.

最も一般的に多用されてきた継手構造は、所謂ループ継手である。このループ継手は、図19に示されるように、位置をずらして橋軸方向に突出する互いのループ状継手鉄筋51、52を適宜の間隔で配置し、このループ状継手51、52の直角方向から補強筋53を挿入して、プレキャスト床版本体間の間詰め部に場所打ちコンクリート54を打設して隣接するプレキャスト床版同士を接続する継手構造50である。 The most commonly used joint structure is the so-called loop joint. In this loop joint, as shown in FIG. 19, the loop-shaped joint reinforcing bars 51 and 52 projecting in the bridge axis direction at different positions are arranged at appropriate intervals, and the loop-shaped joints 51 and 52 are arranged in the direction perpendicular to each other. This is a joint structure 50 in which a reinforcing bar 53 is inserted from the ground, and cast-in-place concrete 54 is cast in a space between the precast floor slabs to connect adjacent precast floor slabs to each other.

また、前記ループ継手構造の適用は、床版厚が240mm以上であることが条件とされるため、床版厚がそれよりも薄い場合は、例えば下記特許文献1に示される、「合理化継手」と呼ばれる継手構造が用いられている。前記「合理化継手」は、ループ鉄筋を使用せずに、図20に示されるように、直線状の連結用鉄筋61の先端に連結用鉄筋の径より大径の定着用頭部62を形成し、これをプレキャスト床版本体の各継手側面において、その上縁側及び下縁側にそれぞれ水平方向に所定の間隔を隔てて多数突設させておき、継手用間隔内で、両プレキャスト床版本体の連結用鉄筋61、61…を互い違いに配置させて水平方向にオーバーラップさせ、補強鉄筋63を所定の位置に配置した後、継手用間隔内に場所打ちコンクリート64を打設した継手構造60である。 Further, the application of the loop joint structure is conditional on the floor slab thickness being 240 mm or more. Therefore, when the floor slab thickness is thinner than that, for example, the "rationalized joint" shown in Patent Document 1 below. A joint structure called is used. In the "rationalized joint", as shown in FIG. 20, a fixing head 62 having a diameter larger than the diameter of the connecting reinforcing bar is formed at the tip of the linear connecting reinforcing bar 61 without using the loop reinforcing bar. On each joint side surface of the precast floor slab body, a large number of these are projected horizontally at predetermined intervals on the upper edge side and the lower edge side, respectively, and the two precast floor slab bodies are connected within the joint interval. This is a joint structure 60 in which cast-in-place concrete 64 is placed within a joint interval after the reinforcing bars 61, 61 ... Are staggered and overlapped in the horizontal direction and the reinforcing bars 63 are arranged at predetermined positions.

更に、間詰部の鉄筋の設置を無くして省力化を図るとともに、間詰め材の低減などにより工期短縮を図るようにした、機械式継手が従来から種々提案されている。例えば、下記特許文献2には、図21に示されるように、溝型断面の雌継手71に対して雄継手72を嵌合させる最も単純な機械式継手70が開示されている。 Further, various mechanical joints have been conventionally proposed in which labor saving is achieved by eliminating the installation of reinforcing bars in the filling portion and the construction period is shortened by reducing the filling material. For example, Patent Document 2 below discloses the simplest mechanical joint 70 in which a male joint 72 is fitted to a female joint 71 having a grooved cross section, as shown in FIG.

特開2015−1045号公報Japanese Unexamined Patent Publication No. 2015-1045 特開2017−190629号広報JP-A-2017-190629 Public Relations

前述した機械式の継手構造は、工期短縮により車線規制や通行規制などによる制限を最小限に留め、周辺交通に与える影響を最小限化できる点で他よりも優れている。しかしながら、溝型断面からなる雌継手に対して雄継手を嵌合させる形式の機械式継手の場合、図21に示されるように、雄継手72に過大な引張力が働いた際に、雌継手71の縦溝73は開口側が支持されていないため、開き方向に変形し易いという問題があった。 The mechanical joint structure described above is superior to others in that it can minimize restrictions due to lane restrictions and traffic restrictions by shortening the construction period and minimize the impact on surrounding traffic. However, in the case of a mechanical joint in which the male joint is fitted to the female joint having a groove-shaped cross section, as shown in FIG. 21, when an excessive tensile force acts on the male joint 72, the female joint Since the vertical groove 73 of 71 is not supported on the opening side, there is a problem that it is easily deformed in the opening direction.

そこで本発明の主たる課題は、溝型断面を有する雌継手における縦溝の変形防止を図ったコンクリート製プレキャスト床版の機械式継手構造及びコンクリート製プレキャスト部材の機械式継手構造を提供することにある。 Therefore, a main object of the present invention is to provide a mechanical joint structure of a concrete precast floor slab and a mechanical joint structure of a concrete precast member in which a vertical groove is prevented from being deformed in a female joint having a groove-shaped cross section. ..

上記課題を解決するために請求項1に係る本発明として、コンクリート製プレキャスト床版同士を接合するための継手構造であって、
継手部を境に一方側のコンクリート製プレキャスト床版の接合端面に、水平方向に所定の間隔で、平面視で溝型断面の溝型係合部を備えた雌継手が縦溝を外部に臨ませた状態で埋設され、
継手部を境に他方側のコンクリート製プレキャスト床版の接合端面に、水平方向に所定の間隔で、橋軸方向鉄筋の先端が外部に突出形成されるとともに、これら橋軸方向鉄筋の先端に相対的に大径の定着部材が設置された雄継手が埋設され、
一方側のコンクリート製プレキャスト床版の雌継手に、他方側のコンクリート製プレキャスト床版の雄継手が係合し、コンクリート製プレキャスト床版同士を結合した状態とし、前記雌継手の内部空間及び雌継手の周囲の空間と、一方側のコンクリート製プレキャスト床版と他方側のコンクリート製プレキャスト床版との間隙部分にグラウト材が充填されており、
前記雌継手の両側にそれぞれ、前記雌継手から所定の距離を空けて、前記橋軸方向鉄筋と平行する方向に延びる開き防止用鉄筋が配置されていることを特徴とするコンクリート製プレキャスト床版の継手構造が提供される。
In order to solve the above problems, the present invention according to claim 1 is a joint structure for joining concrete precast floor slabs to each other.
A female joint with a groove-shaped engaging part with a groove-shaped cross section in a plan view faces the vertical groove to the outside at a predetermined interval in the horizontal direction on the joint end face of the concrete precast floor slab on one side of the joint. It was buried in a dead state
The tips of the bridge axial reinforcing bars are formed so as to protrude outward at predetermined intervals in the horizontal direction on the joint end face of the concrete precast floor slab on the other side of the joint, and are relative to the tips of these bridge axial reinforcing bars. A male joint with a large-diameter fixing member installed is buried.
The female joint of the concrete precast floor slab on one side is engaged with the male joint of the concrete precast floor slab on the other side, and the concrete precast floor slabs are joined to each other. The space around the building and the gap between the concrete precast slab on one side and the concrete precast slab on the other side are filled with ground material.
A concrete precast floor slab characterized in that opening prevention reinforcing bars extending in a direction parallel to the bridge axial reinforcing bars are arranged on both sides of the female joint at a predetermined distance from the female joint. A fitting structure is provided.

上記請求項1記載の発明では、継手部を境に一方側のコンクリート製プレキャスト床版に平面視で溝型断面の溝型係合部を備えた雌継手が縦溝を外部に臨ませた状態で埋設され、継手部を境に他方側のコンクリート製プレキャスト床版に雄継手が埋設され、これらの雌継手と雄継手とが係合し、コンクリート製プレキャスト床版同士を結合した状態で、前記雌継手の内部空間及び雌継手の周囲の空間と、一方側のコンクリート製プレキャスト床版と他方側のコンクリート製プレキャスト床版との間隙部分にグラウト材が充填されている。そして、本発明に係る継手構造では、前記雌継手の両側にそれぞれ、前記雌継手から所定の距離を空けて、前記橋軸方向鉄筋と平行する方向に延びる開き防止用鉄筋が配置されている。これによって、前記雄継手に過大な引張力が作用したときでも、雌継手の縦溝の開口側が前記開き防止用鉄筋によって支持されているため、縦溝の開きが防止できるようになる。 In the invention according to claim 1, a female joint provided with a groove-shaped engaging portion having a groove-shaped cross section on a concrete precast floor slab on one side of the joint portion as a boundary has a vertical groove facing the outside. A male joint is embedded in a concrete precast slab on the other side of the joint portion, and these female joints and the male joint are engaged with each other, and the concrete precast slabs are joined to each other. The ground material is filled in the gap between the internal space of the female joint and the space around the female joint, and the concrete precast slab on one side and the concrete precast slab on the other side. Then, in the joint structure according to the present invention, opening prevention reinforcing bars extending in a direction parallel to the bridge axial direction reinforcing bars are arranged on both sides of the female joint at a predetermined distance from the female joint. As a result, even when an excessive tensile force is applied to the male joint, the opening side of the vertical groove of the female joint is supported by the opening prevention reinforcing bar, so that the opening of the vertical groove can be prevented.

請求項2に係る本発明として、前記開き防止用鉄筋は、水平方向に前記雌継手と重なる位置において、上下方向に沿うループ状に形成されている請求項1記載のコンクリート製プレキャスト床版の継手構造が提供される。 According to the second aspect of the present invention, the concrete precast floor slab joint according to claim 1, wherein the opening prevention reinforcing bar is formed in a loop shape along the vertical direction at a position where the reinforcing bar for preventing opening is horizontally overlapped with the female joint. The structure is provided.

上記請求項2記載の発明では、前記開き防止用鉄筋が、水平方向に前記雌継手と重なる位置において、上下方向に沿うループ状に形成されているため、この開き防止用鉄筋のループ部に支持されることによって雌継手の縦溝が開き方向に変形するのがより確実に防止できるようになる。 In the invention according to claim 2, since the opening prevention reinforcing bar is formed in a loop shape along the vertical direction at a position where it overlaps with the female joint in the horizontal direction, it is supported by the loop portion of the opening prevention reinforcing bar. By doing so, it becomes possible to more reliably prevent the vertical groove of the female joint from being deformed in the opening direction.

請求項3に係る本発明として、前記雌継手と前記開き防止用鉄筋との離隔距離は、5〜40mmである請求項1、2いずれかに記載のコンクリート製プレキャスト床版の継手構造が提供される。 The present invention according to claim 3 provides the joint structure of the concrete precast floor slab according to any one of claims 1 and 2, wherein the separation distance between the female joint and the opening prevention reinforcing bar is 5 to 40 mm. To.

上記請求項3記載の発明では、前記雌継手と前記開き防止用鉄筋との離隔距離を具体的に規定することによって、前記開き防止用鉄筋による雌継手の縦溝の開きがより確実に防止できるようになる。 In the invention according to claim 3, by specifically defining the separation distance between the female joint and the opening prevention reinforcing bar, the opening of the vertical groove of the female joint by the opening prevention reinforcing bar can be more reliably prevented. Will be.

請求項4に係る本発明として、前記開き防止用鉄筋がコンクリートに埋設されている請求項1〜3いずれかに記載のコンクリート製プレキャスト床版の継手構造が提供される。 As the present invention according to claim 4, the joint structure of the concrete precast floor slab according to any one of claims 1 to 3 in which the opening prevention reinforcing bar is embedded in concrete is provided.

上記請求項4記載の発明では、前記開き防止用鉄筋がコンクリートに埋設された状態で配置されている。すなわち、雌継手の両側がコンクリートによって覆われ、その内部に開き防止用鉄筋が埋設されている。これによって、他方側のプレキャスト床版との間隙部分の空間が小さくなり、間詰め材の使用量が低減化できる。 In the invention according to claim 4, the opening prevention reinforcing bar is arranged in a state of being embedded in concrete. That is, both sides of the female joint are covered with concrete, and opening prevention reinforcing bars are embedded inside the female joint. As a result, the space in the gap between the precast floor slab and the other side is reduced, and the amount of padding material used can be reduced.

請求項5に係る本発明として、前記開き防止用鉄筋が一方側のコンクリート製プレキャスト床版の接合端面から突出しており、他方側のコンクリート製プレキャスト床版の接合端面から突出する鉄筋が隣接して配置された状態で、前記グラウト材が充填されている請求項1〜3いずれかに記載のコンクリート製プレキャスト床版の継手構造が提供される。 According to the present invention according to claim 5, the opening prevention reinforcing bar protrudes from the joint end surface of the concrete precast floor slab on one side, and the reinforcing bar protruding from the joint end surface of the concrete precast floor slab on the other side is adjacent to the reinforcing bar. Provided is the joint structure of the concrete precast floor slab according to any one of claims 1 to 3, which is filled with the grout material in the arranged state.

上記請求項5記載の発明では、雌継手の両側に空間部が形成され、その空間部分に、開き防止用鉄筋が一方側のコンクリート製プレキャスト床版の接合端面から突出した状態で配置されている。また、この突出する開き防止用鉄筋に隣接して、他方側のコンクリート製プレキャスト床版の接合端面から突出する鉄筋が配置され、その後グラウト材が充填されるようになっている。これによって、一方側のコンクリート製プレキャスト床版の開き防止用鉄筋と、他方側のコンクリート製プレキャスト床版の鉄筋とが重ね継手のようにして応力の伝達が生じるため、雌継手の縦溝が開き方向に変形するのがより確実に抑えられるようになる。 In the invention according to claim 5, space portions are formed on both sides of the female joint, and the opening prevention reinforcing bars are arranged in the space portions in a state of protruding from the joint end surface of the concrete precast floor slab on one side. .. Further, adjacent to the protruding opening prevention reinforcing bar, a reinforcing bar protruding from the joint end surface of the concrete precast floor slab on the other side is arranged, and then the grout material is filled. As a result, stress is transmitted between the reinforcing bar for preventing the opening of the concrete precast floor slab on one side and the reinforcing bar for the concrete precast floor slab on the other side like a lap joint, so that the vertical groove of the female joint is opened. Deformation in the direction will be more reliably suppressed.

請求項6に係る本発明として、前記雌継手は、前記溝型係合部の前記縦溝と反対側のコンクリートに埋設された部分に、平面視で溝型断面の後側溝型係合部が形成されるとともに、この後側溝型係合部に、橋軸方向鉄筋の先端に相対的に大径の定着部材が配置された雄型定着部が係合されている請求項1〜5いずれかに記載のコンクリート製プレキャスト床版の継手構造が提供される。 According to the present invention according to claim 6, in the female joint, a rear groove type engaging portion having a groove type cross section is formed in a portion of the groove type engaging portion embedded in concrete on the opposite side of the vertical groove. Any of claims 1 to 5, wherein the rear groove type engaging portion is engaged with a male fixing portion in which a fixing member having a relatively large diameter is arranged at the tip of the bridge axial reinforcing bar. The concrete precast slab joint structure described in 1 is provided.

上記請求項6記載の発明は、雌継手を一方側のコンクリート製プレキャスト床版に配筋された橋軸方向鉄筋に連結するための構造について規定している。具体的には、前記溝型係合部の前記縦溝と反対側のコンクリートに埋設された部分に、平面視で溝型断面の後側溝型係合部を形成するとともに、この後側溝型係合部に、橋軸方向鉄筋の先端に設けられた雄型定着部を係合することによって連結している。このように、雌継手と橋軸方向鉄筋との連結に際して溶接を用いていないため、コンクリート製プレキャスト床版の製作性が向上するとともに、疲労損傷の懸念がなくなる。 The invention according to claim 6 defines a structure for connecting a female joint to a bridge axial reinforcing bar arranged on a concrete precast slab on one side. Specifically, a rear groove type engaging portion having a groove type cross section is formed in a portion of the groove type engaging portion embedded in concrete on the opposite side of the vertical groove, and the rear groove type engaging portion is formed. A male fixing portion provided at the tip of a reinforcing bar in the direction of the bridge axis is engaged with the joint portion to connect the joint portion. As described above, since welding is not used for connecting the female joint and the reinforcing bar in the bridge axial direction, the manufacturability of the concrete precast floor slab is improved and there is no concern about fatigue damage.

請求項7に係る本発明として、前記雄継手が上下方向に2段配置で設けられている請求項1〜6いずれかに記載のコンクリート製プレキャスト床版の継手構造が提供される。 The present invention according to claim 7 provides the joint structure of the concrete precast floor slab according to any one of claims 1 to 6, wherein the male joints are provided in a two-stage arrangement in the vertical direction.

上記請求項7記載の発明では、前記雄継手は、水平方向に所定間隔で配置されるが、それぞれの位置で、上下方向に2段配置で設けるようにすることが望ましい。曲げによる圧縮力と引張力とに対処するためである。 In the invention according to claim 7, the male joints are arranged at predetermined intervals in the horizontal direction, but it is desirable that the male joints are provided in two stages in the vertical direction at each position. This is to deal with the compressive force and the tensile force due to bending.

請求項8に係る本発明として、前記雌継手は金型鋳造法によって製作されている請求項1〜7いずれかに記載のコンクリート製プレキャスト床版の継手構造が提供される。 As the present invention according to claim 8, the female joint is provided with a joint structure of a concrete precast floor slab according to any one of claims 1 to 7, wherein the female joint is manufactured by a mold casting method.

上記請求項8記載の発明では、前記雌継手の材質を規定している。雌継手としては、形状の自由度が高い金型鋳造法によって製作することが望ましい。 The invention according to claim 8 defines the material of the female joint. The female joint is preferably manufactured by a mold casting method having a high degree of freedom in shape.

請求項9に係る本発明として、前記グラウト材に代えて、コンクリートが充填されている請求項1〜8いずれかに記載のコンクリート製プレキャスト床版の継手構造が提供される。 As the present invention according to claim 9, the joint structure of the concrete precast floor slab according to any one of claims 1 to 8 in which concrete is filled instead of the grout material is provided.

上記請求項9記載の発明は、施工コストの低減のために前記グラウト材に代えて、コンクリートを充填するようにしたものである。 The invention according to claim 9 is to fill concrete instead of the grout material in order to reduce the construction cost.

請求項10に係る本発明として、前記雌継手の外面に、所定の方向に延びる凸条又は凹条が、該凸条又は凹条の延びる方向と直交する方向に間隔を空けて複数形成されている請求項1〜9いずれかに記載のコンクリート製プレキャスト床版の継手構造が提供される。 According to the tenth aspect of the present invention, a plurality of ridges or dents extending in a predetermined direction are formed on the outer surface of the female joint at intervals in a direction orthogonal to the extending direction of the ridges or dents. Provided is the joint structure of the concrete precast floor slab according to any one of claims 1 to 9.

上記請求項10記載の発明では、雌継手の外面に凹凸状の定着部を形成することによって、雌継手の定着性を高めている。 In the invention according to claim 10, the fixability of the female joint is enhanced by forming an uneven fixing portion on the outer surface of the female joint.

請求項11に係る本発明として、コンクリート製プレキャスト部材同士を接合するための継手構造であって、
継手部を境に一方側のコンクリート製プレキャスト部材の接合端面に、水平方向に所定の間隔で、平面視で溝型断面の溝型係合部を備えた雌継手が縦溝を外部に臨ませた状態で埋設され、
継手部を境に他方側のコンクリート製プレキャスト部材の接合端面に、水平方向に所定の間隔で、接合端面と直交する方向に延びる鉄筋の先端が外部に突出形成されるとともに、これら鉄筋の先端に相対的に大径の定着部材が設置された雄継手が埋設され、
一方側のコンクリート製プレキャスト部材の雌継手に、他方側のコンクリート製プレキャスト部材の雄継手が係合し、コンクリート製プレキャスト部材同士を結合した状態とし、前記雌継手の内部空間及び雌継手の周囲の空間と、一方側のコンクリート製プレキャスト部材と他方側のコンクリート製プレキャスト部材との間隙部分にグラウト材が充填されており、
前記雌継手の両側にそれぞれ、前記雌継手から所定の距離を空けて、前記鉄筋と平行する方向に延びる開き防止用鉄筋が配置されていることを特徴とするコンクリート製プレキャスト部材の継手構造が提供される。
The present invention according to claim 11 is a joint structure for joining concrete precast members to each other.
A female joint with a groove-shaped engaging part with a groove-shaped cross section in a plan view faces the vertical groove to the outside at a predetermined interval in the horizontal direction on the joint end face of the concrete precast member on one side of the joint. Buried in the state
At the joint end face of the concrete precast member on the other side of the joint portion, the tips of the reinforcing bars extending in the direction orthogonal to the joint end face are formed so as to protrude outward at predetermined intervals in the horizontal direction, and at the tips of these reinforcing bars. A male joint with a relatively large diameter fixing member installed is buried,
The female joint of the concrete precast member on one side is engaged with the male joint of the concrete precast member on the other side to connect the concrete precast members to each other, and the internal space of the female joint and the periphery of the female joint are formed. The space and the gap between the concrete precast member on one side and the concrete precast member on the other side are filled with the ground material.
Provided is a joint structure of a concrete precast member, characterized in that opening prevention reinforcing bars extending in a direction parallel to the reinforcing bars are arranged on both sides of the female joint at a predetermined distance from the female joint. Will be done.

上記請求項11記載の発明は、コンクリート製プレキャスト床版に限らず、それ以外のコンクリート製プレキャスト部材にも用いることができることを規定したものである。 The invention according to claim 11 is defined to be applicable not only to a concrete precast floor slab but also to other concrete precast members.

以上詳説のとおり本発明によれば、溝型断面を備えた雌継手における縦溝の変形防止を図ったコンクリート製プレキャスト床版の機械式継手構造及びコンクリート製プレキャスト部材の機械式継手構造を提供することが可能となる。 As described in detail above, according to the present invention, there is provided a mechanical joint structure of a concrete precast floor slab and a mechanical joint structure of a concrete precast member, which are designed to prevent deformation of vertical grooves in a female joint having a groove-shaped cross section. It becomes possible.

コンクリート製プレキャスト床版1A、1Bの継手部2を示す平面図である。It is a top view which shows the joint part 2 of the concrete precast floor slab 1A, 1B. 継手部2の縦断面図(図1のII−II断面図)である。It is a vertical sectional view (II-II sectional view of FIG. 1) of the joint part 2. 継手部2の横断面図(図2のIII−III断面図)である。It is sectional drawing (III-III sectional view of FIG. 2) of the joint part 2. FIG. 継手部2の縦断面図(図1のIV−IV断面図)である。It is a vertical sectional view (IV-IV sectional view of FIG. 1) of the joint part 2. 雌継手3を示す要部拡大平面図である。It is an enlarged plan view of the main part which shows the female joint 3. 雌継手3を示す要部拡大縦断面図(図5のVI−VI断面図)である。It is an enlarged vertical sectional view (VI-VI sectional view of FIG. 5) of the main part which shows the female joint 3. 雌継手3を示す、(A)は縦断面図、(B)は上面図、(C)は左側面図、(D)は右側面図である。The female joint 3 is shown, (A) is a vertical sectional view, (B) is a top view, (C) is a left side view, and (D) is a right side view. 雄継手4を示す床版斜視図である。It is a floor slab perspective view which shows the male joint 4. 雄継手4を示す要部拡大平面図である。It is an enlarged plan view of the main part which shows the male joint 4. コンクリート製プレキャスト床版の接続要領図(A)(B)である。It is connection procedure diagram (A) (B) of the concrete precast floor slab. プレキャスト床版の接合要領手順図(A)〜(C)である。It is (A)-(C) of the procedure diagram of the joining procedure of the precast floor slab. 第2形態例に係るコンクリート製プレキャスト床版1A、1Bの継手部2を示す平面図である。It is a top view which shows the joint part 2 of the concrete precast floor slab 1A, 1B which concerns on the 2nd form example. (A)は一方側、(B)は他方側のコンクリート製プレキャスト床版の接合端面を示す要部拡大図である。(A) is an enlarged view of a main part showing a joint end face of a concrete precast slab on one side and (B) on the other side. (A)は図13(A)のXIVa−XIVa断面図、(B)は図13(B)のXIVb−XIVb断面図である。(A) is a cross-sectional view of XIVa-XIVa of FIG. 13 (A), and (B) is a cross-sectional view of XIVb-XIVb of FIG. 13 (B). 一方側のプレキャスト床版1Aの開き防止用鉄筋15と、他方側のプレキャスト床版1Bの鉄筋20との重なり状態を示す断面図である。It is sectional drawing which shows the overlapping state of the opening prevention reinforcing bar 15 of the precast floor slab 1A on one side, and the reinforcing bar 20 of the precast floor slab 1B on the other side. 第3形態例に係る雌継手3を示す、(A)は正面図、(B)は上面図、(C)は左側面図、(D)は右側面図、(E)は底面図、(F)は縦断面図((B)のF−F断面図)である。The female joint 3 according to the third embodiment is shown, (A) is a front view, (B) is a top view, (C) is a left side view, (D) is a right side view, (E) is a bottom view, ( F) is a vertical sectional view (FF sectional view of (B)). 雌継手3の外面の要部拡大断面図(図16(C)のXVII−XVII断面図)である。FIG. 5 is an enlarged cross-sectional view of a main part of the outer surface of the female joint 3 (XVII-XVII cross-sectional view of FIG. 16C). 雌継手3の外面の要部拡大断面図(図16(D)のXVIII−XVIII断面図)である。FIG. 5 is an enlarged cross-sectional view of a main part of the outer surface of the female joint 3 (XVIII-XVIII cross-sectional view of FIG. 16D). 従来のループ継手50を示す縦断面図である。It is a vertical cross-sectional view which shows the conventional loop joint 50. 従来の合理化継手60を示す縦断面図である。It is a vertical sectional view which shows the conventional rationalized joint 60. 従来の機械式継手70を示す斜視図である。It is a perspective view which shows the conventional mechanical joint 70.

〔第1形態例〕
以下、本発明の実施の形態について図面を参照しながら詳述する。
[Example of first form]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

本発明は、コンクリート製プレキャスト床版(以下、単にプレキャスト床版という。)同士を接合するための機械式継手構造である。一般的に、機械式継手の場合、従来のループ継手や合理化継手に比べて、間詰部の鉄筋の設置を無くしたため省力化が図れるとともに、間詰め材の低減などにより大幅な工期短縮が図れるようになるが、継手自体が高価であり工費が嵩むとともに、位置合わせに高い精度が要求されるなどの欠点がある。そこで、本発明では、簡易的な構造の機械式継手にするとともに、所定量の誤差を吸収可能とし、位置合わせの施工性に優れた機械式継手構造を提案するものである。 The present invention is a mechanical joint structure for joining concrete precast floor slabs (hereinafter, simply referred to as precast floor slabs). In general, in the case of mechanical joints, compared to conventional loop joints and rationalized joints, labor can be saved by eliminating the installation of reinforcing bars in the filling part, and the construction period can be significantly shortened by reducing the filling material. However, there are drawbacks such as the joint itself is expensive, the construction cost is high, and high accuracy is required for alignment. Therefore, the present invention proposes a mechanical joint structure having a simple structure, capable of absorbing a predetermined amount of error, and excellent in alignment workability.

継手構造は、具体的には、図1に示されるように、継手部2を境に一方側のプレキャスト床版1Aの接合端面に、水平方向(橋軸直角方向)に所定の間隔で、平面視で溝型断面の前側溝型係合部6を備えた雌継手3が前側縦溝5を外部に臨ませた状態で埋設され、継手部2を境に他方側のプレキャスト床版1Bの接合端面に、水平方向に所定の間隔で、上下方向に少なくとも2段配置で橋軸方向鉄筋8の先端が外部に突出形成されるとともに、これら橋軸方向鉄筋8の先端に定着部材9が設置された雄継手4が埋設され、
図2〜図4に示されるように、一方側のプレキャスト床版1Aの雌継手3に、他方側のプレキャスト床版1Bの雄継手4を挿入して両床版を結合した状態とし、前記雌継手3の内部空間IS、雌継手3の上部側空間US及び一方側のプレキャスト床版1Aと他方側のプレキャスト床版1Bとの間隙部分Mにグラウト材17が充填されている継手構造である。
Specifically, as shown in FIG. 1, the joint structure is flat on the joint end surface of the precast floor slab 1A on one side of the joint portion 2 at predetermined intervals in the horizontal direction (direction perpendicular to the bridge axis). A female joint 3 provided with a front groove type engaging portion 6 having a groove type cross section is embedded with the front vertical groove 5 facing the outside, and the precast floor slab 1B on the other side is joined with the joint portion 2 as a boundary. The tips of the bridge axial reinforcing bars 8 are formed so as to project outward from the end faces at a predetermined interval in the horizontal direction and at least in two steps in the vertical direction, and the fixing member 9 is installed at the tips of the bridge axial reinforcing bars 8. The male joint 4 is buried,
As shown in FIGS. 2 to 4, the male joint 4 of the precast floor slab 1B on the other side is inserted into the female joint 3 of the precast floor slab 1A on one side to bring the two floor slabs together. It is a joint structure in which the grout material 17 is filled in the internal space IS of the joint 3, the upper space US of the female joint 3, and the gap portion M between the precast floor slab 1A on one side and the precast floor slab 1B on the other side.

以下、さらに具体的に詳述する。 Hereinafter, the details will be described in more detail.

先ず、前記一方側のプレキャスト床版1Aに設けられた雌継手3について、図5〜図7に基づいて詳述する。 First, the female joint 3 provided on the precast floor slab 1A on one side will be described in detail with reference to FIGS. 5 to 7.

前記雌継手3は、詳細には図7に示されるように、一方の端面に前側縦溝5が形成された、平面視で溝型断面の前側溝型係合部6と、これと反対側の他方の端面に後側縦溝10が形成された、平面視で溝型断面の後側溝型係合部11とが、仕切り壁3aを境に左右に背合わせで配置された構造を成す、略直方体の金属製の箱形の部材である。図2及び図3に示されるように、前記前側溝型係合部6には、他方側のプレキャスト床版1Bの接合端面に突出形成された橋軸方向鉄筋8を前記前側縦溝5に挿入した状態で、その先端に備えられた雄継手4が係合されている。また、前記後側溝型係合部11には、一方側のプレキャスト床版1Aの躯体のコンクリート内に埋設された橋軸方向鉄筋12を前記後側縦溝10に挿入した状態で、その先端に相対的に大径の定着部材13が設置された雄型定着部14が係合されている。 As shown in detail in FIG. 7, the female joint 3 has a front groove type engaging portion 6 having a groove type cross section in a plan view and a front side groove type engaging portion 6 having a front side vertical groove 5 formed on one end surface thereof, and the opposite side thereof. A rear groove type engaging portion 11 having a groove type cross section in a plan view, in which a rear side vertical groove 10 is formed on the other end surface of the partition wall 3a, forms a structure in which the rear side groove type engaging portion 11 is arranged back to back on the left and right sides of the partition wall 3a. It is a substantially rectangular parallelepiped metal box-shaped member. As shown in FIGS. 2 and 3, the bridge axial reinforcing bar 8 projecting from the joint end surface of the precast floor slab 1B on the other side is inserted into the front vertical groove 5 in the front groove type engaging portion 6. In this state, the male joint 4 provided at the tip thereof is engaged. Further, in the rear groove type engaging portion 11, a bridge axial reinforcing bar 12 embedded in the concrete of the skeleton of the precast floor slab 1A on one side is inserted into the rear vertical groove 10 at the tip thereof. A male fixing portion 14 on which a fixing member 13 having a relatively large diameter is installed is engaged.

前記雌継手3は、図5及び図6に示されるように、前側溝型係合部6が、上面の開口部及び前記前側縦溝5を外部に臨ませた状態で埋設される一方で、前記後側溝型係合部11が、プレキャスト床版1Aの躯体のコンクリート内に完全に埋設された状態で、前記プレキャスト床版1Aの接合端面に配置されている。 As shown in FIGS. 5 and 6, the female joint 3 is embedded with the front groove type engaging portion 6 facing the opening on the upper surface and the front vertical groove 5 to the outside. The rear gutter type engaging portion 11 is arranged on the joint end surface of the precast floor slab 1A in a state of being completely embedded in the concrete of the skeleton of the precast floor slab 1A.

前記雌継手3の製造法としては、形状の自由度を高くできる金型鋳造法によって製作するのが望ましい。 As a manufacturing method of the female joint 3, it is desirable to manufacture the female joint 3 by a mold casting method capable of increasing the degree of freedom in shape.

図7に示されるように、この雌継手3のうち前側溝型係合部6の幅寸法B及び奥行き寸法Cはそれぞれ概ね80〜150mm、好ましくは100〜130mmとされる。また、後側溝型係合部11の幅寸法Bは、前記前側溝型係合部6の幅寸法Bと同じ寸法で形成するのが好ましく、奥行き寸法Dは、前記前側溝型係合部6の奥行き寸法Cより小さな寸法で形成され、具体的には概ね50〜100mm、好ましくは60〜80mmとされる。前側溝型係合部6は、他方側のプレキャスト床版1Bの接合端面から突出する雄継手4が係合するので、他方側のプレキャスト床版1B据付け時の施工誤差が充分に吸収できるように比較的大きな寸法で形成するのが好ましい。一方、前記後側溝型係合部11は、一方側のプレキャスト床版1Aを工場で製作する際に雄型定着部14を係合させる部分であり、施工誤差が比較的小さいので、比較的小さな寸法で形成することができる。また、雌継手3の高さ寸法Hは、床版の厚みの60〜90%、好ましくは70〜85%の長さとするのが好ましい。 As shown in FIG. 7, the width dimension B and the depth dimension C of the front gutter type engaging portion 6 of the female joint 3 are approximately 80 to 150 mm, preferably 100 to 130 mm, respectively. Further, the width dimension B of the rear gutter type engaging portion 11 is preferably formed to be the same as the width dimension B of the front gutter type engaging portion 6, and the depth dimension D is the front gutter type engaging portion 6. It is formed with a dimension smaller than the depth dimension C of the above, and specifically, it is generally about 50 to 100 mm, preferably 60 to 80 mm. Since the male joint 4 protruding from the joint end surface of the precast floor slab 1B on the other side engages with the front groove type engaging portion 6, the construction error at the time of installing the precast floor slab 1B on the other side can be sufficiently absorbed. It is preferably formed with a relatively large size. On the other hand, the rear groove type engaging portion 11 is a portion for engaging the male fixing portion 14 when the precast floor slab 1A on one side is manufactured at the factory, and the construction error is relatively small, so that it is relatively small. It can be formed by size. The height dimension H of the female joint 3 is preferably 60 to 90%, preferably 70 to 85% of the thickness of the floor slab.

図7(D)に示されるように、前記前側溝型係合部6に形成された前側縦溝5の幅S1は、15〜45mm、好ましくは18〜40mmとされ、後述する雄継手4を構成する橋軸方向鉄筋8の直径に対して110〜220%、好ましくは120〜200%の寸法とされる。また、図7(C)に示されるように、前記後側溝型係合部11に形成された後側縦溝10の幅S2は、前記前側縦溝5の幅S1より小さな寸法で形成され、具体的には10〜40mm、好ましくは13〜35mmとされ、一方側のプレキャスト床版1Aに配筋された橋軸方向鉄筋12の直径に対して、105〜170%、好ましくは110〜150%の寸法とされる。橋軸方向鉄筋8、12の直径に対する比率は、製作誤差ないし施工誤差の許容幅が密接に関係するため適切な数値範囲とすることが望ましい。また、この比率を大きくし過ぎると雄継手4の定着部材9や雄型定着部14の定着部材13との掛かりが小さくなり、力の伝達効率が悪くなるため所定の比率で形成することが望ましい。 As shown in FIG. 7D, the width S1 of the front vertical groove 5 formed in the front groove type engaging portion 6 is 15 to 45 mm, preferably 18 to 40 mm, and the male joint 4 described later is used. The size is 110 to 220%, preferably 120 to 200% of the diameter of the constituent bridge axial reinforcing bars 8. Further, as shown in FIG. 7C, the width S2 of the rear vertical groove 10 formed in the rear groove type engaging portion 11 is formed to be smaller than the width S1 of the front vertical groove 5. Specifically, it is set to 10 to 40 mm, preferably 13 to 35 mm, and is 105 to 170%, preferably 110 to 150% of the diameter of the bridge axial reinforcing bar 12 arranged on the precast floor slab 1A on one side. It is said to be the size of. It is desirable that the ratio of the reinforcing bars 8 and 12 in the bridge axial direction to the diameter be in an appropriate numerical range because the allowable range of manufacturing error or construction error is closely related. Further, if this ratio is made too large, the engagement between the fixing member 9 of the male joint 4 and the fixing member 13 of the male fixing portion 14 becomes small, and the force transmission efficiency deteriorates. Therefore, it is desirable to form the male joint 4 at a predetermined ratio. ..

前記前側溝型係合部6に形成された前側縦溝5及び前記後側溝型係合部11に形成された後側縦溝10は、上端縁から下端縁まで上下方向に貫通して形成してもよいが、図7に示されるように、上端縁から下方向に途中までの長さで形成されたU字状の縦溝とするのが好ましい。U字状の縦溝として下端部を接続することにより、前側縦溝5及び後側縦溝10の開きが防止できる。また、図7(D)に示されるように、前記前側縦溝5の上端部に、上方に向けて徐々に溝幅が大きくなるように傾斜部5aを形成するのが好ましい。これにより、上方から他方側のプレキャスト床版1Bを落とし込むように設置した際、突出する橋軸方向鉄筋8が前側縦溝5にスムーズに挿入できるようになる。 The front vertical groove 5 formed in the front groove type engaging portion 6 and the rear vertical groove 10 formed in the rear groove type engaging portion 11 are formed so as to penetrate in the vertical direction from the upper end edge to the lower end edge. However, as shown in FIG. 7, it is preferable that the U-shaped vertical groove is formed with a length from the upper end edge to the middle in the downward direction. By connecting the lower end portion as a U-shaped vertical groove, it is possible to prevent the front vertical groove 5 and the rear vertical groove 10 from opening. Further, as shown in FIG. 7 (D), it is preferable to form an inclined portion 5a at the upper end portion of the front vertical groove 5 so that the groove width gradually increases upward. As a result, when the precast floor slab 1B on the other side is dropped from above, the protruding bridge axial reinforcing bar 8 can be smoothly inserted into the front vertical groove 5.

一方側のプレキャスト床版1Aにおいて、前記雌継手3に連結される橋軸方向鉄筋12の先端には、相対的に大径の定着部材13が設置された雄型定着部14が形成されている。一方側のプレキャスト床版1Aの製作時に、前記雌継手3の後側溝型係合部11に前記雄型定着部14が係合し、橋軸方向鉄筋12の先端に雌継手3を連結した状態とし、前記後側溝型係合部11の内部空間及び後側溝型係合部11の周囲の空間にコンクリートが充填されることにより、雌継手3が一方側のプレキャスト床版1Aに固定されている。前記定着部材13は、橋軸方向鉄筋12の先端に溶接によることなく、例えば摩擦圧接や螺合などの固定方法によって固定されている。溶接を用いていないため、疲労損傷の懸念がなくなる。特に、固定作業が簡単な摩擦圧接による固定方法が好ましい。 In the precast floor slab 1A on one side, a male fixing portion 14 on which a fixing member 13 having a relatively large diameter is installed is formed at the tip of the bridge axial reinforcing bar 12 connected to the female joint 3. .. At the time of manufacturing the precast floor slab 1A on one side, the male fixing portion 14 is engaged with the rear groove type engaging portion 11 of the female joint 3, and the female joint 3 is connected to the tip of the bridge axial reinforcing bar 12. The female joint 3 is fixed to the precast floor slab 1A on one side by filling the internal space of the rear groove type engaging portion 11 and the space around the rear groove type engaging portion 11 with concrete. .. The fixing member 13 is fixed to the tip of the bridge axial reinforcing bar 12 by a fixing method such as friction welding or screwing without welding. Since welding is not used, there is no concern about fatigue damage. In particular, a fixing method by friction welding, which is easy to fix, is preferable.

前記前側溝型係合部6及び後側溝型係合部11は、開口する上面と同じように、底面も開口させてもよいが、図7(A)に示されるように、底部を閉塞する底板を設けることにより、有底の溝型断面とするのが好ましい。これにより、前側溝型係合部6及び後側溝型係合部11の開きがより確実に防止できるようになる。また、前記前側溝型係合部6及び後側溝型係合部11の底面の中央部には、充填物連通用の開孔(図示せず)を設けてもよい。 The front groove type engaging portion 6 and the rear side groove type engaging portion 11 may be opened at the bottom surface in the same manner as the upper surface to be opened, but the bottom portion is closed as shown in FIG. 7 (A). By providing a bottom plate, it is preferable to have a bottomed groove-shaped cross section. As a result, the opening of the front gutter type engaging portion 6 and the rear gutter type engaging portion 11 can be more reliably prevented. Further, an opening (not shown) for filling communication may be provided in the central portion of the bottom surface of the front gutter type engaging portion 6 and the rear side groove type engaging portion 11.

図1及び図3に示されるように、前記雌継手3の両側にそれぞれ、前記雌継手3から所定の距離を空けて、一方側のプレキャスト床版1Aに配筋された橋軸方向鉄筋12と平行する方向に延びる開き防止用鉄筋15が配置されている。前記開き防止用鉄筋15を配置することにより、雄継手4に過大な引張力が作用したときでも、前側縦溝5の開き方向(雌継手3の両側方向)が開き防止用鉄筋15によって支持されているため、前側縦溝5が開く方向に変形するのが防止できる。つまり、開き防止用鉄筋15がない場合には、雌継手3の両側にコンクリートしか存在しないため、前側縦溝5が開き変形を生じやすくなる。これに対して、前記開き防止用鉄筋15を配置した場合、雌継手3の両側のコンクリートが開き防止用鉄筋15によって補強されるため、前側縦溝5の開き方向への変形が抑制できる。 As shown in FIGS. 1 and 3, the bridge axial reinforcing bars 12 arranged on the precast floor slab 1A on one side at a predetermined distance from the female joint 3 on both sides of the female joint 3, respectively. An opening prevention reinforcing bar 15 extending in a parallel direction is arranged. By arranging the opening prevention reinforcing bar 15, even when an excessive tensile force acts on the male joint 4, the opening direction of the front vertical groove 5 (both sides of the female joint 3) is supported by the opening prevention reinforcing bar 15. Therefore, it is possible to prevent the front vertical groove 5 from being deformed in the opening direction. That is, when there is no opening prevention reinforcing bar 15, only concrete exists on both sides of the female joint 3, so that the front vertical groove 5 is likely to open and deform. On the other hand, when the opening prevention reinforcing bar 15 is arranged, the concrete on both sides of the female joint 3 is reinforced by the opening prevention reinforcing bar 15, so that deformation of the front vertical groove 5 in the opening direction can be suppressed.

前記開き防止用鉄筋15としては、前記橋軸方向鉄筋12とほぼ平行する直線状の棒材としてもよいが、図2及び図3に示されるように、水平方向に雌継手3と重なる位置において、上下方向に沿うループ状のループ部16が形成された略U字状の鉄筋を用いるのが好ましい。このようなループ部16を形成するには、所定長さの棒材を、軸方向の略半分の位置で半円弧状に折り曲げて、略U字状に加工することにより成すことができる。これによって、開き防止用鉄筋15は、雌継手3の側部に上下方向に沿うループ部16が形成されるとともに、このループ部16の上端及び下端からそれぞれ橋軸方向鉄筋12に平行して後方に延びる直線部が上下2段で配置されるようになり、雌継手3の両側部の補強強度がより一層増すようになる。前記ループ部16の高さは、雌継手3の高さHとほぼ同じ寸法で形成するのが好ましい。 The opening prevention reinforcing bar 15 may be a linear bar material substantially parallel to the bridge axial direction reinforcing bar 12, but as shown in FIGS. 2 and 3, at a position where the female joint 3 overlaps in the horizontal direction. It is preferable to use a substantially U-shaped reinforcing bar in which a loop-shaped loop portion 16 along the vertical direction is formed. In order to form such a loop portion 16, a rod member having a predetermined length can be formed by bending it into a semicircular arc shape at a position substantially half in the axial direction and processing it into a substantially U shape. As a result, the opening prevention reinforcing bar 15 is formed with a loop portion 16 along the vertical direction on the side portion of the female joint 3, and is rearward in parallel with the bridge axial reinforcing bar 12 from the upper end and the lower end of the loop portion 16, respectively. The straight portions extending to the upper and lower sides are arranged in two stages, and the reinforcing strength of both side portions of the female joint 3 is further increased. The height of the loop portion 16 is preferably formed to be substantially the same as the height H of the female joint 3.

前記開き防止用鉄筋15の橋軸方向の長さは任意であるが、雌継手3より後方に延びる長さで形成するのが好ましく、具体的には雌継手3の橋軸方向長さの2倍〜5倍程度とするのがよい。 The length of the opening prevention reinforcing bar 15 in the bridge axis direction is arbitrary, but it is preferably formed so as to extend rearward from the female joint 3, specifically, the length of the female joint 3 in the bridge axis direction is 2. It should be about 2 to 5 times.

前記開き防止用鉄筋15のループ部16は、図2に示されるように、水平方向(橋軸直角方向)に雌継手3と重なる位置に配置されている。つまり、図2に示される断面視で、開き防止用鉄筋15のループ部16が雌継手3と重なるように配置されている。特に、前記ループ部16は、図2に示されるように、水平方向に前側溝型係合部6と重なる位置に配置するのがより好ましく、これにより、開き防止用鉄筋15と前側溝型係合部6とが水平方向に重なる面積が多くなり、前側溝型係合部6に形成された前側縦溝5が開き方向に変形するのが確実に防止できるようになる。前側溝型係合部6は、他方側のプレキャスト床版1Bの施工誤差を考慮して、後側溝型係合部11より奥行き寸法及び前側縦溝5の溝幅が大きく形成されているため、雄継手4に過大な引張力が作用した際に、後側縦溝10に比べて、前側縦溝5の方が開き方向により変形しやすくなっているが、前記開き防止用鉄筋15のループ部16が両側に位置することによって、このような開きが生じないようになっている。前記ループ部16の頂部(開き防止用鉄筋15の橋軸方向に対してプレキャスト床版1Aの接合端面側の頂部)は、コンクリートのかぶり厚さの分だけ接合端面(雌継手3の前側縦溝5が形成された端面)より後側に位置している。 As shown in FIG. 2, the loop portion 16 of the opening prevention reinforcing bar 15 is arranged at a position overlapping the female joint 3 in the horizontal direction (direction perpendicular to the bridge axis). That is, in the cross-sectional view shown in FIG. 2, the loop portion 16 of the opening prevention reinforcing bar 15 is arranged so as to overlap the female joint 3. In particular, as shown in FIG. 2, the loop portion 16 is more preferably arranged at a position where it overlaps with the front gutter type engaging portion 6 in the horizontal direction, whereby the opening prevention reinforcing bar 15 and the front gutter type engaging portion are engaged. The area where the joint portion 6 overlaps in the horizontal direction increases, and the front vertical groove 5 formed in the front groove type engaging portion 6 can be reliably prevented from being deformed in the opening direction. The front gutter type engaging portion 6 is formed to have a larger depth dimension and a groove width of the front vertical groove 5 than the rear gutter type engaging portion 11 in consideration of the construction error of the precast floor slab 1B on the other side. When an excessive tensile force is applied to the male joint 4, the front vertical groove 5 is more easily deformed depending on the opening direction than the rear vertical groove 10, but the loop portion of the opening prevention reinforcing bar 15 By locating 16 on both sides, such an opening is prevented. The top of the loop portion 16 (the top of the precast floor slab 1A on the joint end face side with respect to the bridge axis direction of the opening prevention reinforcing bar 15) is the joint end face (front vertical groove of the female joint 3) by the amount of the concrete cover thickness. It is located on the rear side of the end face on which 5 is formed).

図3に示されるように、前記雌継手3と前記開き防止用鉄筋15との水平方向の離隔距離Lは、開き防止用鉄筋15によって雌継手3の前側縦溝5の開きが確実に防止できるように、5〜40mm、好ましくは8〜25mmとするのがよい。 As shown in FIG. 3, the horizontal separation distance L between the female joint 3 and the opening prevention reinforcing bar 15 allows the opening prevention reinforcing bar 15 to reliably prevent the opening of the front vertical groove 5 of the female joint 3. As described above, it is preferably 5 to 40 mm, preferably 8 to 25 mm.

前記開き防止用鉄筋15は、図1に示される例では、隣接する雌継手3、3の間に1本のみ配置され、これがその両側に配置されたそれぞれの雌継手3の側方に配置された開き防止用鉄筋15を兼用するようになっている。一方、図示しないが、雌継手3、3…の水平方向の配置間隔が大きい場合には、各雌継手3の両側にそれぞれ別々に1本ずつ開き防止用鉄筋15を配置することにより、隣接する雌継手3、3間に2本の開き防止用鉄筋15、15が配置されるようにしてもよい。 In the example shown in FIG. 1, only one of the opening prevention reinforcing bars 15 is arranged between the adjacent female joints 3 and 3, and these are arranged on the sides of the respective female joints 3 arranged on both sides thereof. It is designed to also serve as the opening prevention reinforcing bar 15. On the other hand, although not shown, when the horizontal arrangement interval of the female joints 3, 3 ... Is large, one reinforcing bar 15 for preventing opening is arranged on each side of each female joint 3 so as to be adjacent to each other. Two opening prevention reinforcing bars 15 and 15 may be arranged between the female joints 3 and 3.

前記雌継手3の埋設部近傍の床版躯体内には、図1に示されるように、前記雌継手3の後側に連結される橋軸方向鉄筋12や開き防止用鉄筋15の他に、橋軸方向補強筋、橋軸直角方向補強筋、橋軸直角方向PC鋼線などを十字方向に配設して堅固に補強を行うようにしてもよい。 As shown in FIG. 1, in the floor slab in the vicinity of the buried portion of the female joint 3, in addition to the bridge axial reinforcing bar 12 connected to the rear side of the female joint 3 and the opening prevention reinforcing bar 15, Reinforcing bars in the direction of the bridge axis, reinforcing bars in the direction perpendicular to the bridge axis, PC steel wires in the direction perpendicular to the bridge axis, and the like may be arranged in the cross direction to provide firm reinforcement.

次に、前記他方側のプレキャスト床版1Bに設けられた雄継手4について、図8及び図9に基づいて詳述する。 Next, the male joint 4 provided on the precast floor slab 1B on the other side will be described in detail with reference to FIGS. 8 and 9.

前記雄継手4は、接合面より橋軸方向鉄筋8の先端が外部に突出形成されるとともに、これら橋軸方向鉄筋8の先端に定着部材9が設置されたものである。図示の例では、前記定着部材9は、前記橋軸方向鉄筋8より大径のナット又は円形の定着板などによって構成されている。前記定着部材9は、橋軸方向鉄筋8の先端に溶接によることなく、例えば摩擦圧接や螺合などによって固定されている。溶接を用いていないため、疲労損傷の懸念がなくなる。 In the male joint 4, the tip of the bridge axial reinforcing bar 8 is formed so as to project outward from the joint surface, and the fixing member 9 is installed at the tip of the bridge axial reinforcing bar 8. In the illustrated example, the fixing member 9 is composed of a nut having a diameter larger than that of the bridge axial reinforcing bar 8 or a circular fixing plate. The fixing member 9 is fixed to the tip of the bridge axial reinforcing bar 8 by friction welding or screwing, for example, without welding. Since welding is not used, there is no concern about fatigue damage.

図8に示されるように、前記雄継手4は、水平方向に所定の間隔で、上下方向に少なくとも2段配置で設けられ、同じ雌継手3の前側溝型係合部6に上下方向に離隔して配置されるようになっている(図2参照)。前記橋軸方向鉄筋8の直径は、概ねD16〜D22程度とされ、かつ前記雌継手3の前側縦溝5の幅より小さくなっている。図10に示されるように、前記雄継手4を前記雌継手3の前記前側溝型係合部6に上下方向から挿入させることによりプレキャスト床版1A、1B同士が接続される。 As shown in FIG. 8, the male joints 4 are provided in at least two stages in the vertical direction at predetermined intervals in the horizontal direction, and are vertically separated from the front groove type engaging portion 6 of the same female joint 3. (See Fig. 2). The diameter of the bridge axial reinforcing bar 8 is approximately D16 to D22, and is smaller than the width of the front vertical groove 5 of the female joint 3. As shown in FIG. 10, the precast floor slabs 1A and 1B are connected to each other by inserting the male joint 4 into the front gutter type engaging portion 6 of the female joint 3 from above and below.

前記橋軸方向鉄筋8の埋設部近傍の床版躯体内には、図1に示されるように、橋軸方向鉄筋8の他に、橋軸方向補強筋、橋軸直角方向補強筋、橋軸直角方向PC鋼線などを十字方向に配設して堅固に補強を行うようにしてもよい。 As shown in FIG. 1, in the slab skeleton near the buried portion of the bridge axial reinforcing bar 8, in addition to the bridge axial reinforcing bar 8, the bridge axial reinforcing bar, the bridge axial perpendicular reinforcing bar, and the bridge shaft A right-angled PC steel wire or the like may be arranged in a cross direction for firm reinforcement.

(床版1の結合要領)
上記形態例では、一方側のプレキャスト床版1Aの接合端面に雌継手3が設けられ、他方側のプレキャスト床版1Bの接合端面に雄継手4が設けられているとして説明を行ったが、プレキャスト床版を3連以上の接合する場合には、図10に示されるように、1つの矩形のプレキャスト床版1の対向する一方側の面に雌継手3が設けられ、対向する他方側の面に雄継手4が設けられ、各プレキャスト床版を順に接合していく手順でプレキャスト床版1,1…が設置される。
(How to combine floor slab 1)
In the above embodiment, it has been described that the female joint 3 is provided on the joint end surface of the precast floor slab 1A on one side and the male joint 4 is provided on the joint end surface of the precast floor slab 1B on the other side. When joining three or more floor slabs, as shown in FIG. 10, a female joint 3 is provided on one facing surface of one rectangular precast floor slab 1, and the other facing surface is provided. The male joint 4 is provided in the above, and the precast floor slabs 1, 1 ... Are installed in the procedure of joining the precast floor slabs in order.

具体的には、図10及び図11(A)に示されるように、設置済みの先行するプレキャスト床版1の雌継手3に対して、次順の後行するプレキャスト床版1の雄継手4を上側から鉛直方向に落とし込むようにしながらプレキャスト床版1を設置し両者の位置合わせを行う(図11(B))。前記雌継手3と雄継手4との連結は、図11(B)に示されるように、雌継手3の前側縦溝5に雄継手4の定着部材9を係合させた状態、すなわち定着部材9を雌継手3の前側溝型係合部6の内部に位置決めするとともに、橋軸方向鉄筋8を前側縦溝5に挿通させた状態として両プレキャスト床版1、1を結合した状態とする。本願発明は、前側溝型係合部6を備えた雌継手3と、雄継手4を備えた橋軸方向鉄筋8とによる単純な嵌合構造としたため、誤差の許容値が大きく、製作誤差及び施工誤差を吸収して位置合わせが容易に行えるようになっている。 Specifically, as shown in FIGS. 10 and 11 (A), the male joint 4 of the precast floor slab 1 that follows in the following order with respect to the female joint 3 of the precast precast floor slab 1 that has already been installed. The precast floor slab 1 is installed and the two are aligned with each other while dropping the precast floor slab 1 from the upper side in the vertical direction (FIG. 11 (B)). As shown in FIG. 11B, the female joint 3 and the male joint 4 are connected in a state in which the fixing member 9 of the male joint 4 is engaged with the front vertical groove 5 of the female joint 3, that is, the fixing member. 9 is positioned inside the front groove type engaging portion 6 of the female joint 3, and both precast floor slabs 1 and 1 are joined in a state where the bridge axial reinforcing bar 8 is inserted into the front vertical groove 5. Since the present invention has a simple fitting structure consisting of a female joint 3 provided with a front groove type engaging portion 6 and a bridge axial reinforcing bar 8 provided with a male joint 4, the permissible value of error is large, and manufacturing errors and manufacturing errors It absorbs construction errors and facilitates alignment.

次に、図11(C)に示されるように、前記前側溝型係合部6の内部空間IS、前側溝型係合部6の上部側空間US及び一方側のプレキャスト床版と他方側のプレキャスト床版との間隙部分Mにグラウト材17を充填する。なお、前記グラウト材17に代えて、コンクリートを充填するようにしてもよい。 Next, as shown in FIG. 11C, the internal space IS of the front groove type engaging portion 6, the upper space US of the front groove type engaging portion 6, and the precast floor slab on one side and the other side. The grout material 17 is filled in the gap portion M with the precast floor slab. In addition, instead of the grout material 17, concrete may be filled.

このようにして設置した後行するプレキャスト床版1の前記雄継手4が備えられた端面と反対側の端面には、前記雌継手3が備えられており、同様にして、次順の後行するプレキャスト床版1が設置される。プレキャスト床版を3連以上接合する場合には、1つのプレキャスト床版の橋軸方向のほぼ全長に亘って連続する橋軸方向鉄筋が配置され、この橋軸方向鉄筋は、一方がプレキャスト床版1の接合端面から突出して先端に雄継手4が設けられる前記橋軸方向鉄筋8を構成するとともに、他方が先端に前記雄型定着部14が設けられ、雌継手3の後側溝型係合部11に係合される前記橋軸方向鉄筋12を構成している。 The female joint 3 is provided on the end face of the precast floor slab 1 which is installed in this manner and is opposite to the end face of the precast floor slab 1 provided with the male joint 4. Precast floor slab 1 is installed. When three or more precast slabs are joined, continuous bridge axial reinforcing bars are arranged over almost the entire length of one precast slab in the bridge axial direction, and one of the bridge axial reinforcing bars is a precast slab. The bridge axial direction reinforcing bar 8 is provided so as to project from the joint end surface of 1 and a male joint 4 is provided at the tip, and the male fixing portion 14 is provided at the tip of the other, and a rear groove type engaging portion of the female joint 3 is provided. The bridge axial reinforcing bar 12 engaged with 11 is formed.

〔第2形態例〕
上記第1形態例では、前記開き防止用鉄筋15がコンクリートに埋設されていたが、図12〜図14に示されるように、開き防止用鉄筋15の先端が一方側のプレキャスト床版1Aの接合端面から突出しており、他方側のプレキャスト床版1Bの接合端面から突出する鉄筋20の先端が前記開き防止用鉄筋15に隣接して配置された状態で、グラウト材17が充填されるようにしてもよい。
[Example of second form]
In the first embodiment, the opening prevention reinforcing bar 15 is embedded in concrete, but as shown in FIGS. 12 to 14, the tip of the opening prevention reinforcing bar 15 is joined to the precast floor slab 1A on one side. The grout material 17 is filled in a state where the tip of the reinforcing bar 20 protruding from the end face and protruding from the joint end face of the precast floor slab 1B on the other side is arranged adjacent to the opening prevention reinforcing bar 15. May be good.

一方側のプレキャスト床版1Aの接合端面には、雌継手3の前側溝型係合部6及びその両側に配置された開き防止用鉄筋15、15の先端が突出して配置された凹部21が形成されている。この凹部21は、図13(A)及び図14(A)に示されるように、プレキャスト床版1Aの上下面を貫通して床版躯体部を構成するコンクリートが存在しない領域である。この凹部21内には、凹部の底面(接合端面)から突出する雌継手3の前側溝型係合部6及び開き防止用鉄筋15の先端が配置されている。 On the joint end surface of the precast floor slab 1A on one side, a recess 21 is formed in which the tips of the front groove type engaging portions 6 of the female joint 3 and the opening prevention reinforcing bars 15 and 15 arranged on both sides thereof are projected. Has been done. As shown in FIGS. 13 (A) and 14 (A), the recess 21 is a region where the concrete that penetrates the upper and lower surfaces of the precast floor slab 1A and constitutes the floor slab skeleton does not exist. In the recess 21, the front groove type engaging portion 6 of the female joint 3 protruding from the bottom surface (joint end surface) of the recess and the tip of the opening prevention reinforcing bar 15 are arranged.

一方側のプレキャスト床版1Aにおいて、橋軸方向に沿うとともに橋軸直角方向に所定の間隔で配置された橋軸方向鉄筋12、12…のうち、1本おきの橋軸方向鉄筋12の先端に前記雌継手3が連結され、その間の橋軸方向鉄筋12の先端には雄型定着部14が設けられるだけで雌継手3は連結されないようになっている。雌継手3が設けられない橋軸方向鉄筋12は、雌継手3が設けられた橋軸方向鉄筋12より接合端面側に延在して配置されるとともに、先端が橋軸直角方向に隣り合う前記凹部21、21の間において相対的に接合端面側に突出する凸部22内に延在して配置されるようになっている。 In the precast slab 1A on one side, at the tip of every other bridge axial reinforcing bar 12 among the bridge axial reinforcing bars 12, 12 ... Arranged along the bridge axial direction and at predetermined intervals in the direction perpendicular to the bridge axis. The female joint 3 is connected, and only the male fixing portion 14 is provided at the tip of the bridge axial reinforcing bar 12 between them, and the female joint 3 is not connected. The bridge axial reinforcing bar 12 in which the female joint 3 is not provided is arranged so as to extend toward the joint end face side from the bridge axial reinforcing bar 12 in which the female joint 3 is provided, and the tips thereof are adjacent to each other in the direction perpendicular to the bridge axis. It is arranged so as to extend in the convex portion 22 protruding relatively toward the joint end surface side between the concave portions 21 and 21.

前記開き防止用鉄筋15の突出端部(前記ループ部16の頂部)は、雌継手3の突出側の端部とほぼ同等の位置まで延びている。また、これら開き防止用鉄筋15及び雌継手3の突出側の端部は、前記凸部22の接合端面とほぼ一致する位置に配置されている。 The protruding end of the opening prevention reinforcing bar 15 (the top of the loop 16) extends to a position substantially equal to the protruding end of the female joint 3. Further, the protruding side ends of the opening prevention reinforcing bar 15 and the female joint 3 are arranged at positions substantially coincide with the joint end surface of the convex portion 22.

他方側のプレキャスト床版1Bにおいても同様に、橋軸方向に沿うとともに橋軸直角方向に所定の間隔で配置された橋軸方向鉄筋8、8…のうち、前記一方側のプレキャスト床版1Aの雌継手3が配置された鉄筋に対応する1本おきの橋軸方向鉄筋8の先端が外部に突出形成され前記雄継手4が設けられる一方で、その間の橋軸方向鉄筋8の先端は他方側のプレキャスト床版1Bから突出せずにコンクリートに埋設されている。この外部に突出しない橋軸方向鉄筋8の先端にも、外部に突出して雄継手4を形成する橋軸方向鉄筋8と同様に、相対的に大径の定着部材9が設置されている。 Similarly, in the precast slab 1B on the other side, of the rebars 8, 8 ... In the bridge axial direction arranged along the bridge axis direction and at predetermined intervals in the direction perpendicular to the bridge axis, the precast slab 1A on the other side The tip of every other bridge axial reinforcing bar 8 corresponding to the reinforcing bar in which the female joint 3 is arranged is formed so as to project outward to provide the male joint 4, while the tip of the bridge axial reinforcing bar 8 in between is on the other side. It is buried in concrete without protruding from the pre-cast floor slab 1B. A relatively large-diameter fixing member 9 is also installed at the tip of the bridge axial reinforcing bar 8 that does not project outward, as in the bridge axial reinforcing bar 8 that projects outward to form the male joint 4.

外部に突出形成された橋軸方向鉄筋8の両側にはそれぞれ、前記雄継手4を雌継手3に連結した状態で、一方側のプレキャスト床版1Aの端面から突出形成された開き防止用鉄筋15に隣接して配置される鉄筋20が突出形成されている。前記鉄筋20としては、前記開き防止用鉄筋15と同様に、突出端が上下方向に沿うループ状に形成されたループ部23が備えられた略U字状の鉄筋が用いられる。前記鉄筋20のループ部23は、図15に示されるように、前記雄継手4を雌継手3に連結した状態で、前記開き防止用鉄筋15のループ部16とクロスするように配置されるとともに、水平方向に雌継手3と重なる位置に配置されるようになっている。これにより、前記開き防止用鉄筋15及び鉄筋20によって、前側縦溝5の開き方向の側部が補強され、前側縦溝5の開きがより確実に防止できる。前記鉄筋20の突出側の端部は、先端に雄継手4が設けられた橋軸方向鉄筋8の先端とほぼ同等又はこれより外側に突出するように配置するのが好ましい。 Opening prevention reinforcing bars 15 protruding from the end face of the precast floor slab 1A on one side in a state where the male joint 4 is connected to the female joint 3 on both sides of the bridge axial reinforcing bar 8 projecting to the outside. Reinforcing bars 20 arranged adjacent to the above are projected. As the reinforcing bar 20, a substantially U-shaped reinforcing bar provided with a loop portion 23 having a protruding end formed in a loop shape along the vertical direction is used as in the opening preventing reinforcing bar 15. As shown in FIG. 15, the loop portion 23 of the reinforcing bar 20 is arranged so as to cross the loop portion 16 of the opening prevention reinforcing bar 15 in a state where the male joint 4 is connected to the female joint 3. , It is arranged at a position where it overlaps with the female joint 3 in the horizontal direction. As a result, the opening-preventing reinforcing bars 15 and the reinforcing bars 20 reinforce the side portions of the front vertical groove 5 in the opening direction, so that the opening of the front vertical groove 5 can be prevented more reliably. It is preferable that the protruding end of the reinforcing bar 20 is arranged so as to project substantially equal to or outward from the tip of the bridge axial reinforcing bar 8 provided with the male joint 4 at the tip.

前記鉄筋20は、各開き防止用鉄筋15に対して、一定のがわの側部に隣接して配置されるようになっている。これにより、後行する床版を落とし込む際、開き防止用鉄筋15と鉄筋20との干渉が生じにくくなり、雄継手4と雌継手3とが係合しやすくなる。 The reinforcing bar 20 is arranged adjacent to a certain side portion of the sill with respect to each opening prevention reinforcing bar 15. As a result, when the floor slab that follows is dropped, interference between the opening prevention reinforcing bar 15 and the reinforcing bar 20 is less likely to occur, and the male joint 4 and the female joint 3 are more likely to engage with each other.

本第2形態例では、プレキャスト床版1A、1Bの結合において、先行するプレキャスト床版1Aの雌継手3に対して、後行するプレキャスト床版1Bの雄継手4を係合するとともに、開き防止用鉄筋15に隣接して鉄筋20を配置した後、前記前側溝型係合部6の内部空間ISと、前側溝型係合部6の周囲の空間、即ち前側溝型係合部6の上部空間US、側部空間及び下部空間と、プレキャスト床版同士の間隙部分Mとにグラウト材17を充填する。 In the second embodiment, in the connection of the precast floor slabs 1A and 1B, the male joint 4 of the subsequent precast floor slab 1B is engaged with the female joint 3 of the preceding precast floor slab 1A, and the opening is prevented. After arranging the reinforcing bar 20 adjacent to the reinforcing bar 15, the internal space IS of the front groove type engaging portion 6 and the space around the front groove type engaging portion 6, that is, the upper portion of the front groove type engaging portion 6. The grout material 17 is filled in the space US, the side space and the lower space, and the gap portion M between the precast floor slabs.

一方側のプレキャスト床版1Aの接合端面に設けられた凹部21には、上述のように、上下方向に貫通して躯体部分のコンクリートが配置されないようにしてもよいし、雌継手3より下側に床版の躯体部分から延在してコンクリートの底部が配置されるようにしてもよい。 As described above, the recess 21 provided on the joint end surface of the precast floor slab 1A on one side may penetrate in the vertical direction so that the concrete of the skeleton portion is not arranged, or is below the female joint 3. The bottom of the concrete may be arranged so as to extend from the frame portion of the floor slab.

〔第3形態例〕
第3形態例では、図16に示されるように、雌継手3の外面に定着用の凹凸部が設けられるようになっている。具体的には、雌継手3の外面に、所定の方向に延びる凸条24又は凹条25が、該凸条24又は凹条25の延びる方向と直交する方向に間隔を空けて複数形成されている。前記凸条24は、図17に示されるように、相対的に外側に突出した断面略台形状の部位であり、水平方向又は上下方向に延びる線状又は帯状に形成されている。また、前記凹条25は、図18に示されるように、相対的に窪んだ断面略台形状の部位であり、水平方向又は上下方向に延びる線状又は帯状に形成されている。
[Example of third form]
In the third embodiment, as shown in FIG. 16, an uneven portion for fixing is provided on the outer surface of the female joint 3. Specifically, a plurality of ridges 24 or dents 25 extending in a predetermined direction are formed on the outer surface of the female joint 3 at intervals in a direction orthogonal to the extending direction of the ridges 24 or 25. There is. As shown in FIG. 17, the ridge 24 is a substantially trapezoidal portion having a cross section that protrudes relatively outward, and is formed in a linear or strip shape extending in the horizontal direction or the vertical direction. Further, as shown in FIG. 18, the recess 25 is a portion having a substantially trapezoidal cross section that is relatively recessed, and is formed in a linear or strip shape extending in the horizontal direction or the vertical direction.

前記凸条24及び凹条25は、前記雌継手3の各外面のうち、いずれの面に形成するか任意であるが、前記前側縦溝5が形成されるプレキャスト床版1Aの接合端面となる面には凹条25を形成し、上面を除くその他の面には凸条24を形成するのが好ましい。また、上面には凸条及び凹条をいずれも形成しないのが好ましい。雌継手3の前側の端面に凸部を形成した場合には、床版製作時に型枠に当たるとともに、据付け時に他方側のプレキャスト床版1Bとの間の隙間を侵すという問題が生じるため、これらの問題が生じない前記凹条25を形成するのが好ましい。 The ridges 24 and ridges 25 may be formed on any of the outer surfaces of the female joint 3, but may be joint end faces of the precast floor slab 1A on which the front vertical groove 5 is formed. It is preferable to form the recess 25 on the surface and the convex 24 on the other surfaces except the upper surface. Further, it is preferable that neither a ridge nor a dent is formed on the upper surface. If a convex portion is formed on the front end surface of the female joint 3, there is a problem that it hits the mold during the production of the floor slab and invades the gap between the precast floor slab 1B on the other side during installation. It is preferable to form the recess 25 which does not cause a problem.

雌継手3の各外面に対して、前記凸条24又は凹条25が延びる方向は、任意であるが、図16に示されるように、前記前側縦溝5及び後側縦溝10が形成された両端面及び底面では水平方向に延び、両側面では上下方向に延びるように形成するのが好ましい。これにより、雌継手3を前側縦溝5及び後側縦溝10の溝幅の中央部を通る中心線CL(図16(B))で幅方向に2分割した金型を用いて金型鋳造法によって製造する際、前記前側縦溝5及び後側縦溝10が形成された両端面及び底面における2分割した金型の幅方向への抜き易さを確保しつつ、両側面及び底面において橋軸方向に作用する引張力に対する雌継手3の定着強度を高めることができるようになる。 The direction in which the ridge 24 or the ridge 25 extends is arbitrary with respect to each outer surface of the female joint 3, but as shown in FIG. 16, the front vertical groove 5 and the rear vertical groove 10 are formed. It is preferable to form the both end surfaces and the bottom surface so as to extend in the horizontal direction and both side surfaces so as to extend in the vertical direction. As a result, the female joint 3 is cast by using a mold in which the female joint 3 is divided into two in the width direction along the center line CL (FIG. 16 (B)) passing through the central portion of the groove widths of the front vertical groove 5 and the rear vertical groove 10. When manufactured by the method, the bridge is formed on both side surfaces and the bottom surface while ensuring the ease of pulling out the mold divided into two on both end surfaces and the bottom surface on which the front side vertical groove 5 and the rear side vertical groove 10 are formed. The fixing strength of the female joint 3 with respect to the tensile force acting in the axial direction can be increased.

また、前記前側溝型係合部6及び後側溝型係合部11の内面にはそれぞれ、図16(F)に示されるように、内側に突出する複数の凸部26、26…を形成するのが好ましい。前記凸部26は山形断面からなる離散的な突起部であり、内面のうち、雌継手3の両側面に対向する面にそれぞれ設けられている。前記凸部26…を設けることにより、前側溝型係合部6における雄継手4及び後側溝型係合部11における雄型定着部14の定着性が向上する。上下方向の中間部に設けられた凸部26は、中央部に頂点を有し、外側に向けて徐々に高さが低くなる山形に形成するのが好ましい。また、上端部にも凸部26を設けるのが好ましく、この上端部に設けられた凸部26は、中間部に設けられた凸部26を頂部で上下方向に切断した下半部分によって形成され、上下方向の切断面が雌継手3の上面と面一に配置され、この端面から下側に向けて徐々に高さが低くなる形状で形成されるのが好ましい。前記前側溝型係合部6及び後側溝型係合部11の内面の上端部に、上端縁に頂部を有する形状の凸部26が配置されることにより、前記前側溝型係合部6及び後側溝型係合部11に充填されたコンクリート又はグラウト材17の定着性が更に良好になる。 Further, as shown in FIG. 16F, a plurality of convex portions 26, 26 ... Protruding inward are formed on the inner surfaces of the front gutter type engaging portion 6 and the rear gutter type engaging portion 11, respectively. Is preferable. The convex portion 26 is a discrete protrusion having a chevron cross section, and is provided on each of the inner surfaces facing both side surfaces of the female joint 3. By providing the convex portion 26 ..., the fixability of the male joint 4 in the front groove type engaging portion 6 and the male fixing portion 14 in the rear groove type engaging portion 11 is improved. The convex portion 26 provided in the intermediate portion in the vertical direction is preferably formed in a chevron shape having an apex in the central portion and gradually decreasing in height toward the outside. Further, it is preferable to provide a convex portion 26 at the upper end portion, and the convex portion 26 provided at the upper end portion is formed by a lower half portion obtained by cutting the convex portion 26 provided at the intermediate portion in the vertical direction at the upper end portion. It is preferable that the cut surface in the vertical direction is arranged flush with the upper surface of the female joint 3 and is formed in a shape in which the height gradually decreases from the end surface toward the lower side. By arranging a convex portion 26 having a top on the upper end edge at the upper end portion of the inner surface of the front side groove type engaging portion 6 and the rear side groove type engaging portion 11, the front side groove type engaging portion 6 and the rear side groove type engaging portion 6 and the convex portion 26 are arranged. The fixability of the concrete or grout material 17 filled in the rear gutter type engaging portion 11 is further improved.

〔他の形態例〕
(1)上記形態例では、雄継手4を上方側から嵌合させる施工手順としていたが、これとは逆に、雌継手3を上方側から嵌合させる施工手順とする場合、雌継手3の下方側に開放空間を設け、前側縦溝5が下端縁から上方に連続して延びるように形成してもよい。この場合、グラウト材17の充填空間は、雌継手3の内部空間IS、雌継手3の下部側空間及び間隙部分Mとなる。
[Examples of other forms]
(1) In the above embodiment, the construction procedure of fitting the male joint 4 from the upper side is performed, but conversely, when the construction procedure of fitting the female joint 3 from the upper side is performed, the female joint 3 is fitted. An open space may be provided on the lower side so that the front vertical groove 5 continuously extends upward from the lower end edge. In this case, the filling space of the grout material 17 is the internal space IS of the female joint 3, the lower space of the female joint 3, and the gap portion M.

(2)上記形態例では、前側溝型係合部6が有底の上面が開放した箱形に形成されていたが、上面及び下面が共に開放した上下方向に貫通した溝型断面で形成してもよい。この場合、前側溝型係合部6の上面及び下面を共に開放空間としておき、雄継手4を結合させた後、前側溝型係合部6の上部側空間US及び下部側空間の両方にそれぞれグラウト材17を充填する。 (2) In the above embodiment, the front groove type engaging portion 6 is formed in a box shape with a bottomed upper surface open, but is formed with a groove type cross section in which both the upper surface and the lower surface are open and penetrate in the vertical direction. You may. In this case, both the upper surface and the lower surface of the front groove type engaging portion 6 are set as open spaces, and after the male joint 4 is connected, both the upper space US and the lower side space of the front groove type engaging portion 6 are filled with each other. The grout material 17 is filled.

(3)上記形態例では、コンクリート製プレキャスト床版を例に挙げ説明したが、それ以外のコンクリート製プレキャスト部材同士を接合する継手構造にも用いることができる。 (3) In the above embodiment, the concrete precast floor slab has been described as an example, but it can also be used for a joint structure for joining other concrete precast members.

1・1A・1B…コンクリート製プレキャスト床版、2…継手部、3…雌継手4…雄継手、5…前側縦溝、6…前側溝型係合部、8…橋軸方向鉄筋、9…定着部材、10…後側縦溝、11…後側溝型係合部、12…橋軸方向鉄筋、13…定着部材、14…雄型定着部、15…開き防止用鉄筋、16…ループ部、17…グラウト材、20…鉄筋、21…凹部、22…凸部、23…ループ部、24…凸条、25…凹条、IS…溝型断面部の内部空間、US…溝型断面部の上部側空間、M…間隙部分 1.1A / 1B ... Concrete precast slab, 2 ... Joint part, 3 ... Female joint 4 ... Male joint, 5 ... Front vertical groove, 6 ... Front groove type engaging part, 8 ... Bridge axial reinforcing bar, 9 ... Fixing member, 10 ... Rear vertical groove, 11 ... Rear groove type engaging part, 12 ... Bridge axial reinforcing bar, 13 ... Fixing member, 14 ... Male fixing part, 15 ... Reinforcing bar for opening prevention, 16 ... Loop part, 17 ... Grout material, 20 ... Reinforcing bar, 21 ... Concave, 22 ... Convex part, 23 ... Loop part, 24 ... Convex, 25 ... Concave, IS ... Internal space of groove type cross section, US ... Groove type cross section Upper space, M ... Gap

Claims (11)

コンクリート製プレキャスト床版同士を接合するための継手構造であって、
継手部を境に一方側のコンクリート製プレキャスト床版の接合端面に、水平方向に所定の間隔で、平面視で溝型断面の溝型係合部を備えた雌継手が縦溝を外部に臨ませた状態で埋設され、
継手部を境に他方側のコンクリート製プレキャスト床版の接合端面に、水平方向に所定の間隔で、橋軸方向鉄筋の先端が外部に突出形成されるとともに、これら橋軸方向鉄筋の先端に相対的に大径の定着部材が設置された雄継手が埋設され、
一方側のコンクリート製プレキャスト床版の雌継手に、他方側のコンクリート製プレキャスト床版の雄継手が係合し、コンクリート製プレキャスト床版同士を結合した状態とし、前記雌継手の内部空間及び雌継手の周囲の空間と、一方側のコンクリート製プレキャスト床版と他方側のコンクリート製プレキャスト床版との間隙部分にグラウト材が充填されており、
前記雌継手の両側にそれぞれ、前記雌継手から所定の距離を空けて、前記橋軸方向鉄筋と平行する方向に延びる開き防止用鉄筋が配置されていることを特徴とするコンクリート製プレキャスト床版の継手構造。
It is a joint structure for joining concrete precast floor slabs to each other.
A female joint with a groove-shaped engaging part with a groove-shaped cross section in a plan view faces the vertical groove to the outside at a predetermined interval in the horizontal direction on the joint end face of the concrete precast floor slab on one side of the joint. It was buried in a dead state
The tips of the bridge axial reinforcing bars are formed so as to protrude outward at predetermined intervals in the horizontal direction on the joint end face of the concrete precast floor slab on the other side of the joint, and are relative to the tips of these bridge axial reinforcing bars. A male joint with a large-diameter fixing member installed is buried.
The female joint of the concrete precast floor slab on one side is engaged with the male joint of the concrete precast floor slab on the other side, and the concrete precast floor slabs are joined to each other. The space around the building and the gap between the concrete precast slab on one side and the concrete precast slab on the other side are filled with ground material.
A concrete precast floor slab characterized in that opening prevention reinforcing bars extending in a direction parallel to the bridge axial reinforcing bars are arranged on both sides of the female joint at a predetermined distance from the female joint. Joint structure.
前記開き防止用鉄筋は、水平方向に前記雌継手と重なる位置において、上下方向に沿うループ状に形成されている請求項1記載のコンクリート製プレキャスト床版の継手構造。 The joint structure of a concrete precast floor slab according to claim 1, wherein the opening prevention reinforcing bar is formed in a loop shape along the vertical direction at a position where it overlaps with the female joint in the horizontal direction. 前記雌継手と前記開き防止用鉄筋との離隔距離は、5〜40mmである請求項1、2いずれかに記載のコンクリート製プレキャスト床版の継手構造。 The joint structure of a concrete precast floor slab according to any one of claims 1 and 2, wherein the separation distance between the female joint and the opening prevention reinforcing bar is 5 to 40 mm. 前記開き防止用鉄筋がコンクリートに埋設されている請求項1〜3いずれかに記載のコンクリート製プレキャスト床版の継手構造。 The joint structure of a concrete precast floor slab according to any one of claims 1 to 3, wherein the opening prevention reinforcing bar is embedded in concrete. 前記開き防止用鉄筋が一方側のコンクリート製プレキャスト床版の接合端面から突出しており、他方側のコンクリート製プレキャスト床版の接合端面から突出する鉄筋が隣接して配置された状態で、前記グラウト材が充填されている請求項1〜3いずれかに記載のコンクリート製プレキャスト床版の継手構造。 The grout material in a state where the opening prevention reinforcing bar projects from the joint end face of the concrete precast floor slab on one side and the reinforcing bar protruding from the joint end face of the concrete precast floor slab on the other side is arranged adjacent to each other. The joint structure of the concrete precast slab according to any one of claims 1 to 3. 前記雌継手は、前記溝型係合部の前記縦溝と反対側のコンクリートに埋設された部分に、平面視で溝型断面の後側溝型係合部が形成されるとともに、この後側溝型係合部に、橋軸方向鉄筋の先端に相対的に大径の定着部材が配置された雄型定着部が係合されている請求項1〜5いずれかに記載のコンクリート製プレキャスト床版の継手構造。 In the female joint, a rear groove type engaging portion having a groove type cross section is formed in a portion of the groove type engaging portion embedded in concrete opposite to the vertical groove, and the rear groove type is formed. The concrete precast floor slab according to any one of claims 1 to 5, wherein a male fixing portion in which a fixing member having a relatively large diameter is arranged at the tip of a reinforcing bar in the bridge axial direction is engaged with the engaging portion. Joint structure. 前記雄継手が上下方向に2段配置で設けられている請求項1〜6いずれかに記載のコンクリート製プレキャスト床版の継手構造。 The joint structure of a concrete precast floor slab according to any one of claims 1 to 6, wherein the male joints are provided in a two-stage arrangement in the vertical direction. 前記雌継手は金型鋳造法によって製作されている請求項1〜7いずれかに記載のコンクリート製プレキャスト床版の継手構造。 The joint structure of a concrete precast floor slab according to any one of claims 1 to 7, wherein the female joint is manufactured by a mold casting method. 前記グラウト材に代えて、コンクリートが充填されている請求項1〜8いずれかに記載のコンクリート製プレキャスト床版の継手構造。 The joint structure of a concrete precast floor slab according to any one of claims 1 to 8, wherein the concrete is filled in place of the grout material. 前記雌継手の外面に、所定の方向に延びる凸条又は凹条が、該凸条又は凹条の延びる方向と直交する方向に間隔を空けて複数形成されている請求項1〜9いずれかに記載のコンクリート製プレキャスト床版の継手構造。 Claims 1 to 9 in which a plurality of ridges or dents extending in a predetermined direction are formed on the outer surface of the female joint at intervals in a direction orthogonal to the extending direction of the ridges or dents. The concrete precast floor slab joint structure described. コンクリート製プレキャスト部材同士を接合するための継手構造であって、
継手部を境に一方側のコンクリート製プレキャスト部材の接合端面に、水平方向に所定の間隔で、平面視で溝型断面の溝型係合部を備えた雌継手が縦溝を外部に臨ませた状態で埋設され、
継手部を境に他方側のコンクリート製プレキャスト部材の接合端面に、水平方向に所定の間隔で、接合端面と直交する方向に延びる鉄筋の先端が外部に突出形成されるとともに、これら鉄筋の先端に相対的に大径の定着部材が設置された雄継手が埋設され、
一方側のコンクリート製プレキャスト部材の雌継手に、他方側のコンクリート製プレキャスト部材の雄継手が係合し、コンクリート製プレキャスト部材同士を結合した状態とし、前記雌継手の内部空間及び雌継手の周囲の空間と、一方側のコンクリート製プレキャスト部材と他方側のコンクリート製プレキャスト部材との間隙部分にグラウト材が充填されており、
前記雌継手の両側にそれぞれ、前記雌継手から所定の距離を空けて、前記鉄筋と平行する方向に延びる開き防止用鉄筋が配置されていることを特徴とするコンクリート製プレキャスト部材の継手構造。
It is a joint structure for joining concrete precast members to each other.
A female joint with a groove-shaped engaging part with a groove-shaped cross section in a plan view faces the vertical groove to the outside at a predetermined interval in the horizontal direction on the joint end face of the concrete precast member on one side of the joint. Buried in the state
At the joint end face of the concrete precast member on the other side of the joint portion, the tips of the reinforcing bars extending in the direction orthogonal to the joint end face are formed so as to protrude outward at predetermined intervals in the horizontal direction, and at the tips of these reinforcing bars. A male joint with a relatively large diameter fixing member installed is buried,
The female joint of the concrete precast member on one side is engaged with the male joint of the concrete precast member on the other side to connect the concrete precast members to each other, and the internal space of the female joint and the periphery of the female joint are formed. The space and the gap between the concrete precast member on one side and the concrete precast member on the other side are filled with the ground material.
A joint structure of a concrete precast member, characterized in that opening prevention reinforcing bars extending in a direction parallel to the reinforcing bars are arranged on both sides of the female joint at a predetermined distance from the female joint.
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* Cited by examiner, † Cited by third party
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JPS6119098U (en) * 1984-07-11 1986-02-04 石川島建材工業株式会社 Joint fittings for concrete structures
JP2011063984A (en) * 2009-09-17 2011-03-31 Toda Constr Co Ltd Concrete joint structure
JP2016108820A (en) * 2014-12-05 2016-06-20 鹿島建設株式会社 Joint structure, precast member, and joining method
JP2017190629A (en) * 2016-04-14 2017-10-19 大成建設株式会社 Joint structure of precast member
JP2019039292A (en) * 2017-08-25 2019-03-14 戸田建設株式会社 Joint structure of concrete precast floor slab

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6119098U (en) * 1984-07-11 1986-02-04 石川島建材工業株式会社 Joint fittings for concrete structures
JP2011063984A (en) * 2009-09-17 2011-03-31 Toda Constr Co Ltd Concrete joint structure
JP2016108820A (en) * 2014-12-05 2016-06-20 鹿島建設株式会社 Joint structure, precast member, and joining method
JP2017190629A (en) * 2016-04-14 2017-10-19 大成建設株式会社 Joint structure of precast member
JP2019039292A (en) * 2017-08-25 2019-03-14 戸田建設株式会社 Joint structure of concrete precast floor slab

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