JP7834588B2 - Fixing jig and method for manufacturing concrete floor slab - Google Patents
Fixing jig and method for manufacturing concrete floor slabInfo
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- JP7834588B2 JP7834588B2 JP2022104264A JP2022104264A JP7834588B2 JP 7834588 B2 JP7834588 B2 JP 7834588B2 JP 2022104264 A JP2022104264 A JP 2022104264A JP 2022104264 A JP2022104264 A JP 2022104264A JP 7834588 B2 JP7834588 B2 JP 7834588B2
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Description
本発明は、プレキャスト床版の製造時に当該プレキャスト床版に埋め込まれる発泡合成樹脂材を固定するための固定治具およびこれを利用したコンクリート床版の製造方法に関する。 This invention relates to a fixing jig for securing a foamed synthetic resin material embedded in a precast floor slab during its manufacture, and to a method for manufacturing a concrete floor slab using the same.
コンクリート床版を軽量化すれば、支持構造の簡素化（例えば、梁の小断面化）が可能となる。また、コンクリート床版がプレキャスト部材（プレキャスト床版）である場合には、プレキャスト床版を軽量化することにより、プレキャスト床版を敷設する際の手間を低減することができる。
床版の軽量化を図る場合において、例えば、発泡合成樹脂製の埋め殺し型枠を埋め込む場合がある。例えば、特許文献１には、底鋼板の上面に発泡合成樹脂製の埋め殺し型枠を配置した状態で、埋め殺し型枠を埋没させるようにコンクリートを打設して合成床版を形成する床版の製造方法が開示されている。埋め殺し型枠は、接着剤を用いて底鋼板に固定している。なお、特許文献１の床版の施工方法は、底鋼板に埋め殺し型枠を固定するものであるため、底鋼板を有しないコンクリート床版には適用できない。
一方、コンクリート床版については、ボルトなどの治具を介して発泡合成樹脂材を型枠に固定することで、コンクリート床版内に発泡合成樹脂材を設けることができるが、脱型時にボルトを取り外す必要があり、作業に手間がかかる。
また、鉄筋等と発泡合成樹脂製の埋め殺し型枠を金属材料で固定する方法も存在するが、緊張材は緊張時にひずみが生じるため、緊張材には同様の手法が適用できない。したがって、緊張材のみが配筋されている方向が存在する構造では、埋め殺し型枠の固定が困難になる。
Reducing the weight of the concrete slab allows for simplification of the support structure (for example, by reducing the cross-section of the beams). Furthermore, if the concrete slab is a precast member (precast slab), reducing the weight of the precast slab reduces the effort required to lay it.
In order to reduce the weight of the floor slab, for example, a permanent formwork made of foamed synthetic resin may be embedded. For example, Patent Document 1 discloses a method for manufacturing a floor slab in which a permanent formwork made of foamed synthetic resin is placed on the upper surface of a bottom steel plate, and concrete is poured so as to embed the permanent formwork to form a composite floor slab. The permanent formwork is fixed to the bottom steel plate using an adhesive. However, since the construction method for the floor slab in Patent Document 1 involves fixing the permanent formwork to the bottom steel plate, it cannot be applied to concrete floor slabs that do not have a bottom steel plate.
On the other hand, with concrete slabs, foamed synthetic resin material can be installed inside the concrete slab by fixing it to the formwork using jigs such as bolts, but the bolts must be removed when demolding, which makes the work time-consuming.
Furthermore, there is a method of fixing reinforcing bars and other materials to the foamed synthetic resin formwork with metal materials, but this method cannot be applied to tensioning members because they undergo strain when tensioned. Therefore, in structures where only tensioning members are arranged in a particular direction, fixing the formwork becomes difficult.
本発明は、プレキャスト床版の製造時の手間を最小限に抑えつつ、所定の位置に発泡合成樹脂材を埋め込むことを可能とした固定治具およびこれを利用したコンクリート床版の製造方法を提案することを課題とする。 The present invention aims to propose a fixing jig that enables the embedding of foamed synthetic resin material in a predetermined position while minimizing the effort required during the manufacturing of precast floor slabs, and a method for manufacturing concrete floor slabs using this jig.
前記課題を解決するために、本発明の固定治具は、コンクリート床版の内部に埋め込まれる発泡合成樹脂材（ＥＰＳ）を鉄筋に固定するためのものであって、前記発泡合成樹脂材の表面に添設される本体部と、前記発泡合成樹脂材に差し込まれる突起部と、前記鉄筋に係止される係止部とを備えている。前記突起部は前記本体部の発泡合成樹脂材側の面に立設された柱状体であり、前記係止部は前記本体部の両端に形成されていて平行に配筋された異なる鉄筋にそれぞれ係止される。なお、固定治具は、非金属あるいは表面加工（防食加工）が施された金属により構成されているのが望ましい。
また、本発明の固定治具を利用したコンクリート床版の製造方法は、コンクリート床版の下側鉄筋を組み立てる第一鉄筋配筋工程と、前記下側鉄筋に第一の前記固定治具を取り付ける第一治具取付工程と、前記発泡合成樹脂材を第一の前記固定治具の前記本体部に載置するとともに前記突起部を当該発泡合成樹脂材の下面に差し込むＥＰＳ配設工程と、前記コンクリート床版の上側鉄筋を組み立てる第二鉄筋配筋工程と、前記発泡合成樹脂材の上面に第二の前記固定治具の前記本体部を載置しつつ前記突起部を前記発泡合成樹脂材の上面に差し込み、当該固定治具を前記上側鉄筋に取り付ける第二治具取付工程とを備えている。前記第一の固定治具および前記第二の固定治具は上下に対向配置され、各固定治具の前記係止部は左右に並設された異なる鉄筋にそれぞれ係止されている。
かかる固定治具およびコンクリート床版の製造方法によれば、発泡合成樹脂材を鉄筋により支持するため、コンクリート床版の表面に治具が露出することがない。また、固定治具の突起部を発泡合成樹脂材に差し込むことで両者を固定できるため、作業性に優れている。固定治具は、コンクリート内に埋設されるため、脱型時に治具を取り外すなどの手間を要しない。
なお、隣り合う前記発泡合成樹脂材同士の間にスペーサーを介設して前記発泡合成樹脂材の位置決めを行うとともに、第一の前記固定治具を前記下側鉄筋に固定する位置決め工程をさらに備えていれば、発泡合成樹脂材の位置決めを簡易に行うことができる。
また、前記コンクリート床版に緊張材のみが配設される方向がある場合には、前記緊張材と直角方向に配筋された鉄筋に発泡合成樹脂材（固定治具）を固定すればよい。このように緊張材を介さずに発泡合成樹脂材を固定すれば、緊張材の緊張時にひずみが生じた場合であっても、発泡合成樹脂材に影響が及ぶことはない。
To solve the aforementioned problems, the fixing jig of the present invention is for fixing foamed synthetic resin material (EPS) embedded inside a concrete floor slab to reinforcing bars, and comprises a main body attached to the surface of the foamed synthetic resin material, a projection inserted into the foamed synthetic resin material, and a locking part that engages with the reinforcing bar. The projection is a columnar body erected on the foamed synthetic resin material side of the main body, and the locking parts are formed at both ends of the main body and engage with different reinforcing bars arranged in parallel. Preferably, the fixing jig is made of a non-metallic material or a metal with surface treatment (corrosion-resistant treatment).
Furthermore, the method for manufacturing a concrete floor slab using the fixing jig of the present invention comprises: a first rebar placement step for assembling the lower rebar of the concrete floor slab; a first jig attachment step for attaching the first fixing jig to the lower rebar; an EPS placement step for placing the foamed synthetic resin material on the main body of the first fixing jig and inserting the projection into the lower surface of the foamed synthetic resin material; a second rebar placement step for assembling the upper rebar of the concrete floor slab; and a second jig attachment step for placing the main body of the second fixing jig on the upper surface of the foamed synthetic resin material and inserting the projection into the upper surface of the foamed synthetic resin material, thereby attaching the fixing jig to the upper rebar. The first and second fixing jigs are arranged opposite each other vertically, and the locking parts of each fixing jig are locked to different rebars arranged side by side on the left and right.
According to this fixing jig and concrete slab manufacturing method, the foamed synthetic resin material is supported by reinforcing bars, so the jig is not exposed on the surface of the concrete slab. Furthermore, since the two can be fixed together by inserting the projection of the fixing jig into the foamed synthetic resin material, the workability is excellent. Because the fixing jig is embedded in the concrete, there is no need to remove the jig during demolding.
Furthermore, if the positioning process includes interposing spacers between adjacent foamed synthetic resin materials to position them, and fixing the first fixing jig to the lower reinforcing bar, the positioning of the foamed synthetic resin materials can be easily performed.
Furthermore, if there is a direction in which only tensioning members are installed on the concrete slab, the foamed synthetic resin material (fixing jig) can be fixed to the reinforcing bars arranged perpendicular to the tensioning members. By fixing the foamed synthetic resin material in this way without using tensioning members, even if strain occurs when the tensioning members are tensioned, the foamed synthetic resin material will not be affected.
本発明の固定治具およびコンクリート床版の製造方法によれば、プレキャスト床版の製造時の手間を最小限に抑えつつ、発泡合成樹脂材を所定の位置に埋め込むことが可能となる。 According to the fixing jig and concrete slab manufacturing method of the present invention, it is possible to embed foamed synthetic resin material in a predetermined position while minimizing the effort required during the manufacturing of precast slabs.
本実施形態では、複数の発泡合成樹脂材２が埋め込まれることで軽量化されたコンクリート床版１について説明する。図１に本実施形態のコンクリート床版１を示す。コンクリート床版１は、平面視矩形状で、橋軸直角方向に沿って緊張材（本実施形態ではＰＣ鋼棒）３が埋設されているとともに、緊張材３と直交する方向（橋軸方向）に沿って鉄筋４が埋設されている。緊張材３および鉄筋４は、コンクリート床版１の上面側と下面側にそれぞれ埋設されている。
発泡合成樹脂材２は、固定治具５を介して鉄筋４に固定された状態で、コンクリート１１に埋設されている（図１では固定治具５を省略している）。図２に発泡合成樹脂材２を示す。発泡合成樹脂材２は、図２（ａ）～（ｃ）に示すように、平面視矩形状を呈したブロック体であって、各角部分は隅切られている。また、図２（ｂ）に示すように、発泡合成樹脂材２の上面および下面には、鉄筋４の配設位置に対応して、断面視台形状の溝（凹部）２１が形成されている。すなわち、発泡合成樹脂材２は、橋軸方向側面視で、左右一対の八角形状部材を矩形状部材により接合した眼鏡状を呈している。
This embodiment describes a concrete slab 1 that has been lightened by embedding multiple foamed synthetic resin materials 2. Figure 1 shows the concrete slab 1 of this embodiment. The concrete slab 1 is rectangular in plan view, and tensioning members (PC steel bars in this embodiment) 3 are embedded along the direction perpendicular to the bridge axis, and reinforcing bars 4 are embedded along the direction perpendicular to the tensioning members 3 (in the direction of the bridge axis). The tensioning members 3 and reinforcing bars 4 are embedded on the upper and lower sides of the concrete slab 1, respectively.
The foamed synthetic resin material 2 is embedded in the concrete 11 while fixed to the reinforcing bars 4 via a fixing jig 5 (the fixing jig 5 is omitted in Figure 1). Figure 2 shows the foamed synthetic resin material 2. As shown in Figures 2(a) to (c), the foamed synthetic resin material 2 is a block body that has a rectangular shape in plan view, and each corner is cut off. Also, as shown in Figure 2(b), trapezoidal grooves (recesses) 21 are formed on the upper and lower surfaces of the foamed synthetic resin material 2 in cross-sectional view, corresponding to the arrangement positions of the reinforcing bars 4. That is, in a side view along the bridge axis, the foamed synthetic resin material 2 has a spectacle-like shape, with a pair of octagonal members joined by a rectangular member.
以下、コンクリート床版１の製造方法について説明する。図３にコンクリート床版１の製造方法の手順を示す。図３に示すように、コンクリート床版１の製造方法は、型枠組立工程Ｓ１と、第一鉄筋配筋工程Ｓ２と、第一治具取付工程Ｓ３と、ＥＰＳ配設工程Ｓ４と、位置決め工程Ｓ５と、第二鉄筋配筋工程Ｓ６と、第二治具取付工程Ｓ７と、緊張工程Ｓ８と、コンクリート打設工程Ｓ９とを有している。
図４に型枠組立工程Ｓ１および第一鉄筋配筋工程Ｓ２を示す。型枠組立工程Ｓ１は、図４に示すように、型枠６を組み立てる工程である。型枠組立工程Ｓ１では、コンクリート床版１の端面に対応する位置にせき板６１を配設する。
第一鉄筋配筋工程Ｓ２は、コンクリート床版１の下面側に配設される鉄筋４（下側鉄筋４１）を配筋する工程である。下側鉄筋４１は、型枠６内に配筋する。第一鉄筋配筋工程Ｓ２では、下側鉄筋４１とともに、緊張材３（本実施形態ではＰＣ鋼棒）を配設する。緊張材３は下側鉄筋４１と直交するように配設する。
The method for manufacturing the concrete slab 1 will be described below. Figure 3 shows the procedure for manufacturing the concrete slab 1. As shown in Figure 3, the method for manufacturing the concrete slab 1 includes a formwork assembly step S1, a first reinforcing bar placement step S2, a first jig installation step S3, an EPS placement step S4, a positioning step S5, a second reinforcing bar placement step S6, a second jig installation step S7, a tensioning step S8, and a concrete pouring step S9.
Figure 4 shows the formwork assembly process S1 and the first reinforcement bar placement process S2. As shown in Figure 4, the formwork assembly process S1 is the process of assembling the formwork 6. In the formwork assembly process S1, the formwork panels 61 are placed at positions corresponding to the end faces of the concrete floor slab 1.
The first rebar placement process S2 is the process of placing the reinforcing bars 4 (lower reinforcing bars 41) to be placed on the lower side of the concrete floor slab 1. The lower reinforcing bars 41 are placed inside the formwork 6. In the first rebar placement process S2, tensioning members 3 (PC steel bars in this embodiment) are placed together with the lower reinforcing bars 41. The tensioning members 3 are placed perpendicular to the lower reinforcing bars 41.
第一治具取付工程Ｓ３は、下側鉄筋４１に図５（ｂ）、（ｃ）に示す固定治具５（第一の固定治具）を取り付ける工程である。図５は固定治具５を示す図である。
第一の固定治具５（図５（ｂ）において下側の固定治具５）は、コンクリート床版１の内部に埋め込まれる発泡合成樹脂材２を下側鉄筋４１に固定するものである。第一の固定治具５は、後記する第二の固定治具５（図５（ｂ）において上側の固定治具５）と上下対称の形状を具備している。まず、第一の固定治具５および第二の固定治具５に共通する構成を説明する。固定治具５は、非金属あるいは表面加工が施された金属からなる。固定治具５は、発泡合成樹脂材２の表面に添設される本体部５１と、発泡合成樹脂材２に差し込まれる突起部５２と、鉄筋４（下側鉄筋４１または上側鉄筋４２）に係止される係止部５３とを備えている。本体部５１は、図５（ｂ）に示すように、発泡合成樹脂材２の表面形状（上面または下面）に応じて波型を呈している。また、突起部５２は、本体部５１の発泡合成樹脂材２側の面に立設された柱状体である。さらに、係止部５３は、鉄筋４に係止可能なフック状を呈している。固定治具５の一端（図５（ａ）において左側）に形成された係止部５３は隙間をあけて二本に分かれており、第一の固定治具５の他端（図５（ｂ）において右側）に形成された係止部５３は一本である。他端側の係止部５３は、一端側の係止部５３の隙間に挿入可能な幅である。こうすると、隣り合う固定治具５同士が干渉することがない。
第一治具取付工程Ｓ３では、突起部５２が上向きに突出するように第一の固定治具５を配設し、係止部５３を下側鉄筋４１に係止することにより固定治具５を下側鉄筋４１に取り付ける。
The first jig attachment step S3 is the step of attaching the fixing jig 5 (first fixing jig) shown in Figures 5(b) and (c) to the lower reinforcing bar 41. Figure 5 is a diagram showing the fixing jig 5.
The first fixing jig 5 (the lower fixing jig 5 in Figure 5(b)) is used to fix the foamed synthetic resin material 2, which is embedded inside the concrete floor slab 1, to the lower reinforcing bar 41. The first fixing jig 5 has a shape that is vertically symmetrical to the second fixing jig 5 (the upper fixing jig 5 in Figure 5(b)), which will be described later. First, the common configuration of the first fixing jig 5 and the second fixing jig 5 will be explained. The fixing jig 5 is made of a non-metallic material or a metal with a surface treatment. The fixing jig 5 comprises a main body portion 51 attached to the surface of the foamed synthetic resin material 2, a projection portion 52 inserted into the foamed synthetic resin material 2, and a locking portion 53 that engages with the reinforcing bar 4 (lower reinforcing bar 41 or upper reinforcing bar 42). As shown in Figure 5(b), the main body portion 51 has a wavy shape depending on the surface shape (upper or lower surface) of the foamed synthetic resin material 2. Furthermore, the projection 52 is a columnar body erected on the surface of the main body 51 facing the foamed synthetic resin material 2. In addition, the locking portion 53 has a hook shape that can be locked onto the reinforcing bar 4. The locking portion 53 formed at one end of the fixing jig 5 (left side in Figure 5(a)) is divided into two with a gap between them, while the locking portion 53 formed at the other end of the first fixing jig 5 (right side in Figure 5(b)) is a single portion. The locking portion 53 at the other end is wide enough to be inserted into the gap of the locking portion 53 at the one end. This prevents adjacent fixing jigs 5 from interfering with each other.
In the first jig installation step S3, the first fixing jig 5 is positioned so that the projection 52 protrudes upward, and the fixing jig 5 is attached to the lower reinforcing bar 41 by locking the locking portion 53 to the lower reinforcing bar 41.
図６にＥＰＳ配設工程Ｓ４～第二治具取付工程Ｓ６を示す。ＥＰＳ配設工程Ｓ４は、図６に示すように、発泡合成樹脂材２を配設する工程である。ＥＰＳ配設工程Ｓ４では、発泡合成樹脂材２を固定治具５の本体部５１に載置するとともに突起部５２を発泡合成樹脂材２の下面に差し込むことにより配設する（図５（ｂ）参照）。本実施形態の発泡合成樹脂材２には、突起部５２の位置に対応して、予め切込みが形成されている。この切込みに突起部５２を差し込むことで、発泡合成樹脂材２を固定治具５に固定する。 Figure 6 shows the EPS placement process S4 to the second jig mounting process S6. The EPS placement process S4 is the process of placing the foamed synthetic resin material 2, as shown in Figure 6. In the EPS placement process S4, the foamed synthetic resin material 2 is placed on the main body 51 of the fixing jig 5, and the projection 52 is inserted into the lower surface of the foamed synthetic resin material 2 (see Figure 5(b)). In this embodiment, the foamed synthetic resin material 2 has pre-formed notches corresponding to the positions of the projection 52. By inserting the projection 52 into these notches, the foamed synthetic resin material 2 is fixed to the fixing jig 5.
図７に位置決め工程Ｓ５の詳細を示す。位置決め工程Ｓ５は、発泡合成樹脂材２の位置決めを行う工程である。位置決め工程Ｓ５では、図７（ａ）および（ｂ）に示すように、隣り合う発泡合成樹脂材２同士の間にスペーサー７を介設して発泡合成樹脂材２の位置決めを行う。スペーサー７は、予め定められた発泡合成樹脂材２同士の間隔と同じ幅を有した底板７１と、底板７１の両端から上方に延びる一対の側板７２，７２とにより凹字状に形成されている。側板７２は、発泡合成樹脂材２の側面形状に応じた形状（本実施形態ではく字状）を有している。スペーサー７は、発泡合成樹脂材２同士の間に差し込むことにより、発泡合成樹脂材２同士の間隔を所定の大きさに調整する。本実施形態では、隣り合う一対の発泡合成樹脂材２の間に二つのスペーサー７，７を介設する。複数の発泡合成樹脂材２は、スペーサー７により所定の間隔を確保した状態で配設される。発泡合成樹脂材２を所定の位置に配設したら、固定治具５の係止部５３を下側鉄筋４１に結束線（図示せず）で固定する。固定治具５を下側鉄筋４１に固定したら、スペーサー７を取り外す。 Figure 7 shows the details of the positioning process S5. The positioning process S5 is a process for positioning the foamed synthetic resin material 2. In the positioning process S5, as shown in Figures 7(a) and (b), spacers 7 are interposed between adjacent foamed synthetic resin material 2 to position the foamed synthetic resin material 2. The spacer 7 is formed in a concave shape by a bottom plate 71 having the same width as the predetermined distance between foamed synthetic resin material 2 and a pair of side plates 72, 72 extending upward from both ends of the bottom plate 71. The side plates 72 have a shape (in this embodiment, a V-shape) that corresponds to the side shape of the foamed synthetic resin material 2. By inserting the spacer 7 between the foamed synthetic resin material 2, the distance between the foamed synthetic resin material 2 is adjusted to a predetermined size. In this embodiment, two spacers 7, 7 are interposed between a pair of adjacent foamed synthetic resin material 2. Multiple foamed synthetic resin material 2 are arranged with a predetermined distance secured by the spacers 7. Once the foamed synthetic resin material 2 is positioned in the designated location, the locking portion 53 of the fixing jig 5 is secured to the lower reinforcing bar 41 with binding wire (not shown). After the fixing jig 5 is secured to the lower reinforcing bar 41, the spacer 7 is removed.
第二鉄筋配筋工程Ｓ６は、図６に示すように、コンクリート床版１の上側鉄筋４２を配筋する工程である。本実施形態では、上側鉄筋４２の配筋とともに、上側鉄筋４２と直交する向きで緊張材３を配設する。
第二治具取付工程Ｓ７は、発泡合成樹脂材２の上面に固定治具５（第二の固定治具）を設置する工程である（図５参照）。第二治具取付工程Ｓ７では、図５（ｂ）に示すように、発泡合成樹脂材２の上面に第二の固定治具５の本体部５１を載置しつつ突起部５２を発泡合成樹脂材２の上面に差し込む。突起部５２は、発泡合成樹脂材２の上面に形成された切込みに差し込む。第二の固定治具５を発泡合成樹脂材２の上面に設置したら、第二の固定治具５の係止部５３を、結束線で上側鉄筋４２に固定する。
緊張工程Ｓ８は、緊張材３を緊張する工程である。
コンクリート打設工程Ｓ９は、型枠６内にコンクリートを打設する工程である。
打設コンクリートの養生後、脱型する。
The second rebar placement process S6 is the process of placing the upper rebars 42 of the concrete floor slab 1, as shown in Figure 6. In this embodiment, along with placing the upper rebars 42, tensioning members 3 are placed in a direction perpendicular to the upper rebars 42.
The second jig installation step S7 is the step of installing the fixing jig 5 (second fixing jig) on the upper surface of the foamed synthetic resin material 2 (see Figure 5). In the second jig installation step S7, as shown in Figure 5(b), the main body 51 of the second fixing jig 5 is placed on the upper surface of the foamed synthetic resin material 2, and the projection 52 is inserted into the upper surface of the foamed synthetic resin material 2. The projection 52 is inserted into a notch formed on the upper surface of the foamed synthetic resin material 2. Once the second fixing jig 5 is installed on the upper surface of the foamed synthetic resin material 2, the locking portion 53 of the second fixing jig 5 is fixed to the upper reinforcing bar 42 with binding wire.
The tensioning process S8 is a process of tensioning the tensioning material 3.
The concrete pouring process S9 is the process of pouring concrete into the formwork 6.
After the poured concrete has cured, the formwork is removed.
本実施形態のコンクリート床版１の製造方法によれば、固定治具５を介して発泡合成樹脂材２を鉄筋４により支持するため、コンクリート床版１の表面に治具が露出することがない。
また、固定治具５の突起部５２を発泡合成樹脂材２に差し込むだけで両者を固定できるため、作業性に優れている。
固定治具５は、コンクリート内に埋設されるため、脱型時に治具を取り外すなどの手間を要しない。
さらに、隣り合う発泡合成樹脂材２同士の間にスペーサー７を介設して発泡合成樹脂材２の位置決めを行うため、簡易に発泡合成樹脂材２の位置決めが行われる。
緊張材３のみが存在する方向（例えば、図１における橋軸直角方向）があっても、その直角方向（図１における橋軸方向）に発泡合成樹脂材２を固定することができるため、緊張材３に発泡合成樹脂材２を固定する必要がない。そのため、緊張材３の緊張時にひずみが生じた場合であっても、発泡合成樹脂材２に影響（例えば、移動する等）がおよぶことがない。
In the manufacturing method of the concrete slab 1 of this embodiment, the foamed synthetic resin material 2 is supported by the reinforcing bars 4 via the fixing jig 5, so the jig is not exposed on the surface of the concrete slab 1.
Furthermore, since the two can be fixed together simply by inserting the projection 52 of the fixing jig 5 into the foamed synthetic resin material 2, it offers excellent workability.
Since the fixing jig 5 is embedded in the concrete, there is no need to remove the jig during demolding.
Furthermore, by interposing spacers 7 between adjacent foamed synthetic resin materials 2 to position the foamed synthetic resin materials 2, the positioning of the foamed synthetic resin materials 2 can be easily performed.
Even if there is a direction in which only the tensioning member 3 exists (for example, the direction perpendicular to the bridge axis in Figure 1), the foamed synthetic resin material 2 can be fixed in that perpendicular direction (the direction of the bridge axis in Figure 1), so there is no need to fix the foamed synthetic resin material 2 to the tensioning member 3. Therefore, even if strain occurs when the tensioning member 3 is tensioned, it does not affect the foamed synthetic resin material 2 (for example, it does not move).
以上、本発明の実施形態について説明したが、本発明は、前述の実施形態に限られず、前記の各構成要素については、本発明の趣旨を逸脱しない範囲で適宜変更が可能である。
発泡合成樹脂材２の形状は、前記実施形態で示した構成に限定されるものではない。
固定治具５の本体部５１は、必ずしも波型である必要はない。図８（ａ）～（ｃ）に示すように、平板状であってもよい。このとき、発泡合成樹脂材２の上面および下面には、固定治具５を設置可能な溝が形成されていてもよい。
固定治具５の係止部５３の形状は、鉄筋４への係止が可能であれば、限定されるものではない。また、係止部５３の鉄筋４への固定方法は、結束線による方法に限定されるものではない。
スペーサー７は、必要に応じて使用すればよい。また、スペーサー７の形状は限定されるものではない。
前記実施形態では、型枠組立工程Ｓ１後に第一鉄筋配筋工程Ｓ２を行う場合について説明したが、型枠６を組み立てるタイミングは、コンクリート打設工程Ｓ９の前であれば限定されるものではなく、鉄筋４を配筋してから周囲に型枠６を組み立ててもよい。
また、前記実施形態では、鉄筋４を配筋した後に固定治具５を配置するものとしたが、鉄筋４の組み立てと平行して固定治具５を配置してもよい。
Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and each of the above-mentioned components can be modified as appropriate without departing from the spirit of the present invention.
The shape of the foamed synthetic resin material 2 is not limited to the configuration shown in the above embodiment.
The main body 51 of the fixing jig 5 does not necessarily have to be corrugated. As shown in Figures 8(a) to (c), it may be flat. In this case, grooves for installing the fixing jig 5 may be formed on the upper and lower surfaces of the foamed synthetic resin material 2.
The shape of the locking portion 53 of the fixing jig 5 is not limited as long as it can be locked onto the reinforcing bar 4. Furthermore, the method of fixing the locking portion 53 to the reinforcing bar 4 is not limited to the method using binding wire.
Spacer 7 can be used as needed. Furthermore, the shape of spacer 7 is not limited.
In the above embodiment, the case in which the first reinforcing bar placement process S2 is performed after the formwork assembly process S1 was described. However, the timing of assembling the formwork 6 is not limited to before the concrete pouring process S9, and the formwork 6 may be assembled around the reinforcing bars 4 after they have been placed.
Furthermore, in the above embodiment, the fixing jig 5 is placed after the reinforcing bars 4 are arranged, but the fixing jig 5 may be placed in parallel with the assembly of the reinforcing bars 4.
１ コンクリート床版
２ 発泡合成樹脂材
３ 緊張材
４ 鉄筋
４１ 下側鉄筋
４２ 上側鉄筋
５ 固定治具
５１ 本体部
５２ 突起部
５３ 係止部
６ 型枠
７ スペーサー
1. Concrete slab 2. Foamed synthetic resin material 3. Tensioning material 4. Reinforcing bars 41. Lower reinforcing bars 42. Upper reinforcing bars 5. Fixing jig 51. Main body 52. Projection 53. Locking part 6. Formwork 7. Spacer
Claims (5)
前記発泡合成樹脂材の表面に添設される本体部と、
前記発泡合成樹脂材に差し込まれる突起部と、
前記鉄筋に係止される係止部と、を備え、
前記突起部は、前記本体部の発泡合成樹脂材側の面に立設された柱状体であり、
前記係止部は、前記本体部の両端に形成されていて、平行に配筋された異なる鉄筋にそれぞれ係止されることを特徴とする、固定治具。 A fixing jig for securing a foamed synthetic resin material embedded inside a concrete floor slab to reinforcing bars,
A main body portion attached to the surface of the foamed synthetic resin material,
The aforementioned foamed synthetic resin material includes a protrusion that is inserted into it,
It comprises a locking portion that engages with the reinforcing bar ,
The aforementioned projection is a columnar body erected on the surface of the main body that is made of foamed synthetic resin,
The locking portion is formed at both ends of the main body and is characterized by being able to lock onto different reinforcing bars arranged in parallel .
コンクリート床版の下側鉄筋を組み立てる第一鉄筋配筋工程と、
前記下側鉄筋に第一の前記固定治具を取り付ける第一治具取付工程と、
前記発泡合成樹脂材を第一の前記固定治具の前記本体部に載置するとともに前記突起部を当該発泡合成樹脂材の下面に差し込むＥＰＳ配設工程と、
前記コンクリート床版の上側鉄筋を組み立てる第二鉄筋配筋工程と、
前記発泡合成樹脂材の上面に第二の前記固定治具の前記本体部を載置しつつ前記突起部を当該発泡合成樹脂材の上面に差し込み、当該固定治具を前記上側鉄筋に取り付ける第二治具取付工程と、を備え、
前記第一の固定治具および前記第二の固定治具は、上下に対向配置され、
各固定治具の前記係止部は、左右に並設された異なる鉄筋にそれぞれ係止されていることを特徴とする、コンクリート床版の製造方法。 A method for manufacturing a concrete floor slab using a fixing jig according to any one of claims 1 to 3,
The first reinforcement bar placement process involves assembling the lower reinforcement bars of the concrete slab,
A first jig attachment step involves attaching the first fixing jig to the lower reinforcing bar,
EPS placement step: The foamed synthetic resin material is placed on the main body of the first fixing jig and the projection is inserted into the lower surface of the foamed synthetic resin material.
The second rebar placement process involves assembling the upper reinforcing bars of the aforementioned concrete slab,
The process includes a second jig attachment step, in which the main body of the second fixing jig is placed on the upper surface of the foamed synthetic resin material, the projection is inserted into the upper surface of the foamed synthetic resin material, and the fixing jig is attached to the upper reinforcing bar ,
The first fixing jig and the second fixing jig are arranged facing each other vertically.
A method for manufacturing a concrete floor slab, characterized in that the locking portion of each fixing jig is locked to different reinforcing bars arranged side by side on the left and right .
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