JP2004270277A

JP2004270277A - Void fixing structure and fixing member

Info

Publication number: JP2004270277A
Application number: JP2003062151A
Authority: JP
Inventors: Hideo Fujimiya; 英雄藤宮; Yutaka Onishi; 豊大西; Tamotsu Kawai; 保河合; Nozomi Haraguchi; 望原口; Masayoshi Kishi; 正吉岸
Original assignee: ONISHI CORK KOGYOSHO KK; Kanegafuchi Chemical Industry Co Ltd
Current assignee: ONISHI CORK KOGYOSHO KK; Kanegafuchi Chemical Industry Co Ltd
Priority date: 2003-03-07
Filing date: 2003-03-07
Publication date: 2004-09-30

Abstract

<P>PROBLEM TO BE SOLVED: To provide a void fixing structure allowing positive weight reduction and position fixation of a void while dispensing with blocking treatment of a void end part, and allowing enlargement of a void fixing span and reducing the number of fixing members in use to fix the void, and to provide the void fixing member easily mountable and positively fixing the position of the void. <P>SOLUTION: The fixing structure of the void 1 is provided with at least two reinforcements disposed horizontally parallel with a space to each other to construct a floor slab 9 of a building; the void 1 formed of foam plastic into bar shape and disposed in a space A between two reinforcements in parallel with the longitudinal direction of the reinforcements; the fixing member 3 fixed to at least two reinforcements to fittingly fix the void 1 thereto. A reinforcing bar (a reinforcing member ) 4 is disposed inside or at the outer periphery of the void 1 in parallel with the longitudinal direction of the void 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、建物の床スラブの軽量化や床スラブの長スパン化のために床スラブに埋設されるボイドの固定構造、及びボイドを固定するための固定材に関する。
【０００２】
【従来の技術】
従来のこの種の技術としては、（１）型枠にトラスを複数並設し、隣接するトラスの間に前記トラスと平行に円筒状のボイドを配設し、このボイドの上側を下向きの脚を有する押さえ部材で保持し、この押さえ部材の脚の下部を前記トラスに係止した建築用床構造材等が知られている（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開２００１−３０３７０７号公報（第２頁，第３頁，図１，図２）
【０００４】
また、（２）鉄製又はステンレス製の棒材を、発泡スチロール等の軽量素材からなるボイドを２〜４本挿入できるような正面形状に加工した固定金具等を使用してボイドスラブを施工する方法等も知られている（例えば、特許文献２参照）。
【０００５】
【特許文献２】
特開平１１−１０７４２３号公報（第２頁−第４頁，図９，図１６）
【０００６】
一方、（３）ボイドを所定位置に保持するための保持部材としては、上記（１）の建築用床構造材に使用される、下部が前記トラスに係止される下向きの脚を有する前記押さえ部材等が知られている（例えば、特許文献１参照）。
【０００７】
【発明が解決しようとする課題】
上記（１）の建築用床構造材においては、配線等のために円筒状のボイドが使用されているが、打設される硬化前のコンクリート等の浸入を防ぐためにボイドの端部を閉塞する必要がある。そのため、ボイドの端部の閉塞処理に手間がかかると共に、閉塞処理が不完全な場合、ボイド内へコンクリートが浸入したり、漏水が生じたりする。その場合、軽量化が十分でなくなったり、コンクリート固化後、ボイド内に溜まった水による悪影響が生じる等の問題点がある。
【０００８】
また、円筒状のボイドとしては、スパイラル鋼管が多く使用されているが、このスパイラル鋼管からなるボイドは高価であり、重量も大きいと共に、形状も円筒状に限られているという問題点がある。
【０００９】
上記（２）のボイドスラブの施工に際し、スラブを構成するコンクリートを打設すれば、硬化前のコンクリート中でボイドに浮力が作用する。しかし、このボイドは発泡スチロール等の軽量素材からなり、曲げ強度が小さいので、浮力による上方へのたわみは大きなものとなる。そのため、ボイドのたわみを抑えるには、ボイドの固定スパン（固定金具同士の間隔）を小さくせざるを得ず、多数の固定金具を使用する必要があるという問題点がある。
【００１０】
また、ボイドは固定金具に挿入されているだけであるので、ボイドの位置固定が確実でないという問題点がある。
【００１１】
一方、上記（３）の押さえ部材においては、トラスの下端近傍に配設された下端筋に脚の下部を番線等で１つずつ係止する必要があるので、取り付け作業が煩雑であると共に、ボイドの位置固定を確実に行うこともできないという問題点がある。
【００１２】
この発明は、以上のような問題点に鑑みてなされたものであり、ボイドの端部の閉塞処理が不要でボイドの確実な軽量化及び位置固定が可能であると共に、ボイドの固定スパンの拡大が可能でボイドを固定するための固定材の使用数を低減化できるボイドの固定構造を提供することを第１の目的とする。
【００１３】
また、簡単に取り付け可能であると共に、ボイドの位置固定を確実に行うことができるボイドの固定材を提供することを第２の目的とする。
【００１４】
【課題を解決するための手段】
上記目的を達成するための請求項１のボイドの固定構造は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋と、発泡プラスチックから棒状に形成されかつ前記少なくとも２つの鉄筋間の空間に前記鉄筋の長手方向に対して平行に配設されたボイドと、前記少なくとも２つの鉄筋に固定されかつ前記ボイドが嵌着された固定材と、を備えたボイドの固定構造であって、前記ボイドの内部又は外周に補強材を前記ボイドの長手方向に対して平行に配設したものである。
【００１５】
請求項２のボイドの固定構造は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋と、発泡プラスチックから棒状に形成されかつ前記少なくとも２つの鉄筋間の空間に前記鉄筋の長手方向に対して平行に配設されたボイドと、このボイドの下方に前記ボイドの長手方向に対して直角に配設されかつ前記ボイドが載置された支持棒と、前記少なくとも２つの鉄筋に前記ボイドを上方から押さえるように固定された固定材と、を備えたボイドの固定構造であって、前記ボイドの内部又は外周に補強材を前記ボイドの長手方向に対して平行に配設したものである。
【００１６】
請求項３のボイドの固定構造は、前記補強材を前記ボイドの外周の上端に配設し、この補強材を前記固定材に係止したものである。
【００１７】
請求項４のボイドの固定構造は、前記ボイドが複数の棒体を長手方向に連結したものであり、前記補強材を、隣接する２つの棒体の両方に掛け渡すように配設したものである。
【００１８】
請求項５のボイドの固定構造は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋と、発泡プラスチックから棒状に形成されかつ前記少なくとも２つの鉄筋間の空間に前記鉄筋の長手方向に対して平行に配設されたボイドと、前記少なくとも２つの鉄筋に固定されかつ前記ボイドが嵌着された固定材と、を備えたボイドの固定構造であって、前記ボイドの外周の少なくとも上端に補強テープを前記ボイドの長手方向に対して平行に貼り付けたものである。
【００１９】
請求項６のボイドの固定構造は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋と、発泡プラスチックから棒状に形成されかつ前記少なくとも２つの鉄筋間の空間に前記鉄筋の長手方向に対して平行に配設されたボイドと、このボイドの下方に前記ボイドの長手方向に対して直角に配設されかつ前記ボイドが載置された支持棒と、前記少なくとも２つの鉄筋に前記ボイドを上方から押さえるように固定された固定材と、を備えたボイドの固定構造であって、前記ボイドの外周の少なくとも上端に補強テープを前記ボイドの長手方向に対して平行に貼り付けたものである。
【００２０】
請求項７のボイドの固定構造は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋と、発泡プラスチックから棒状に形成されかつ前記少なくとも２つの鉄筋間の空間に前記鉄筋の長手方向に対して平行に配設されたボイドと、前記少なくとも２つの鉄筋に固定されかつ前記ボイドが嵌着された固定材と、を備えたボイドの固定構造であって、前記ボイドが複数の棒体を長手方向に連結したものであり、前記固定材を、隣接する２つの棒体の両方に掛け渡すようにして前記ボイドの長手方向に対して斜め方向に固定したものである。
【００２１】
請求項８のボイドの固定構造は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋と、発泡プラスチックから棒状に形成されかつ前記少なくとも２つの鉄筋間の空間に前記鉄筋の長手方向に対して平行に配設されたボイドと、このボイドの下方に前記ボイドの長手方向に対して直角に配設されかつ前記ボイドが載置された支持棒と、前記少なくとも２つの鉄筋に前記ボイドを上方から押さえるように固定された固定材と、を備えたボイドの固定構造であって、前記ボイドが複数の棒体を長手方向に連結したものであり、前記固定材を、隣接する２つの棒体の両方に掛け渡すようにして前記ボイドの長手方向に対して斜め方向に固定したものである。
【００２２】
請求項９のボイドの固定構造においては、前記固定材が、各鉄筋にそれぞれ嵌着される少なくとも２つの嵌着部と、前記ボイドが嵌着されるボイド固定部と、各嵌着部と前記ボイド固定部とをそれぞれ連結する少なくとも２つの支持アームと、からなる。
【００２３】
請求項１０のボイドの固定構造は、少なくとも前記ボイド固定部の一部に設けられた凹部又は凸部を、前記ボイドの外周の側部に形成された移動防止部に当接するようにしたものである。
【００２４】
請求項１１のボイドの固定構造は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋と、発泡プラスチックから棒状に形成されかつ前記少なくとも２つの鉄筋間の空間に前記鉄筋の長手方向に対して平行に配設されたボイドと、前記少なくとも２つの鉄筋に固定されかつ前記ボイドが嵌着された固定材と、を備えたボイドの固定構造であって、前記固定材が、各鉄筋にそれぞれ嵌着される少なくとも２つの嵌着部と、前記ボイドが嵌着されるボイド固定部と、各嵌着部と前記ボイド固定部とをそれぞれ連結する少なくとも２つの支持アームとからなり、少なくとも前記ボイド固定部の一部に設けられた凹部又は凸部を、前記ボイドの外周の側部に形成された移動防止部に当接するようにしたものである。
【００２５】
請求項１２のボイドの固定構造においては、前記固定材が、各鉄筋にそれぞれ嵌着される少なくとも２つの嵌着部と、前記ボイドを上方から押さえるボイド押さえ部と、各嵌着部と前記ボイド押さえ部とをそれぞれ連結する少なくとも２つの支持アームと、からなる。
【００２６】
請求項１３のボイドの固定構造は、建物の床スラブに水平に埋設される支持棒と、発泡プラスチックから棒状に形成されて前記支持棒に水平にかつ前記支持棒の長手方向に対して直角に吊着されたボイドと、を備えたボイドの固定構造であって、前記ボイドの外周の上端に補強材を前記ボイドの長手方向に対して平行に配設し、この補強材を前記支持棒に係止したものである。
【００２７】
請求項１４のボイドの固定構造は、発泡プラスチックから棒状に形成されかつ建物の床スラブに水平に埋設されるボイドと、水平にかつ前記ボイドの長手方向に対して直角にこのボイドを貫通するように配設された支持棒と、を備えたボイドの固定構造であって、前記ボイドの内部又は外周に補強材を前記ボイドの長手方向に対して平行に配設したものである。
【００２８】
請求項１５のボイドの固定構造は、発泡プラスチックから棒状に形成されかつ建物の床スラブに水平に埋設されるボイドと、水平にかつ前記ボイドの長手方向に対して直角にこのボイドを貫通するように配設された支持棒と、を備えたボイドの固定構造であって、前記ボイドの外周の少なくとも上端に補強テープを前記ボイドの長手方向に対して平行に貼り付けたものである。
【００２９】
また、請求項１６のボイドの固定材は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋間の空間に、長尺なボイドを前記鉄筋の長手方向に対して平行に固定するためのボイドの固定材であって、各鉄筋にそれぞれ嵌着される少なくとも２つの嵌着部と、前記ボイドが嵌着されるボイド固定部と、各嵌着部と前記ボイド固定部とをそれぞれ連結する少なくとも２つの支持アームと、からなるものである。
【００３０】
請求項１７のボイドの固定材においては、少なくとも前記ボイド固定部の一部に設けられた凹部又は凸部を、前記ボイドの外周の側部に形成された移動防止部に当接するようにしたものである。
【００３１】
請求項１８のボイドの固定材は、建物の床スラブを施工するために水平にかつ互いに間隔を開けて平行に配設された少なくとも２つの鉄筋間の空間に、長尺なボイドを前記鉄筋の長手方向に対して平行に固定するためのボイドの固定材であって、各鉄筋にそれぞれ嵌着される少なくとも２つの嵌着部と、前記ボイドを上方から押さえるボイド押さえ部と、各嵌着部と前記ボイド押さえ部とをそれぞれ連結する少なくとも２つの支持アームと、からなるものである。
【００３２】
請求項１９のボイドの固定材は、前記少なくとも２つの鉄筋に前記ボイドの長手方向に対して斜め方向に固定されるものである。
【００３３】
【発明の実施の形態】
以下、この発明の実施形態を図面に基づいて説明する。
第１実施形態に係るボイド１の固定構造は、図１乃至図５に示すように、２つの下端鉄筋（鉄筋）２とボイド１と固定材３とを備えたものであって、ボイド１の外周の上端に補強鉄筋（補強材）４をボイド１の長手方向に対して平行に埋設（配設）したものである。
【００３４】
ボイド１は、発泡プラスチックから数十ｃｍ〜十数ｍ長さの丸棒状に形成されており、隣接する２つの下端鉄筋２間の空間Ａに下端鉄筋２の長手方向に対して平行に配設されている。発泡プラスチックとしては、発泡ポリスチレン、発泡ポリウレタン、発泡ポリエチレン、発泡ポリプロピレン等が挙げられる。なお、ボイド１の断面形状は円状に限定されるものではなく、だ円状、俵状、逆台形状、矩形状等であってもよい。
【００３５】
このボイド１は、図３乃至図９に示すように、それぞれ発泡プラスチックからなる数十ｃｍ〜数ｍ長さの複数の棒体５を長手方向に連結したものである。図６乃至図９に示すように、棒体５の一端５ａには、正面視が四半円状の２つの凹部６を対向して設けることによって正面視が四半円状の２つの凸部７が対向して設けられている。棒体５の他端５ｂには、隣接する棒体５の一端５ａの各凸部７がそれぞれ嵌合される正面視が四半円状の２つの凹部６を対向して設けることによって、隣接する棒体５の一端５ａの各凹部６にそれぞれ嵌合される正面視が四半円状の２つの凸部７が対向して設けられている。この棒体５の外周の上端には、図３乃至図１０に示すように、上方が開口した断面がＣ字状の嵌着溝８が棒体５の長手方向に対して平行に形成されている。棒体５同士は、図８及び図９に示すように、一方の棒体５の２つの凹部６に他方の棒体５の２つの凸部７を嵌合することによって、互いの嵌着溝８の位置を合わせた状態で連結できるようになっている。なお、複数の棒体５を長手方向に連結してボイド１を構成する場合、固定材３によるボイド１の固定は、この実施形態のように棒体５の連結部で行うのが望ましい。
【００３６】
下端鉄筋２は、図１及び図２に示すように、建物の床スラブ９を施工するために水平にかつ互いに間隔を開けて平行に配設されている。この下端鉄筋２は、鉄筋トラス１０の一部を構成しており、デッキプレート１１と複数の鉄筋トラス１０とを備えた鉄筋組込デッキ１２に組み込まれている。
【００３７】
デッキプレート１１は、溶融亜鉛メッキ鋼板等から構成されており、複数のリブ１３が互いに間隔を開けて平行に設けられている。リブ１３は、デッキプレート１１の所定範囲を適当に折曲等することにより形成されている。デッキプレート１１における隣接する２つのリブ１３の間は、山部及び谷部がリブ１３の長手方向に対して直角となるようにして波状に形成されている（図示は省略）。また、デッキプレート１１の幅は例えば数十ｃｍに形成されており、デッキプレート１１の幅方向（鉄筋トラス１０の長手方向に対して直角方向）の一側端と他側端には長手方向に延びるフック部１１ａ，１１ｂがそれぞれ設けられている。隣接する２つのデッキプレート１１は、一側端と他側端の各フック部１１ａ，１１ｂを互いに係止することによって、幅方向に連結できるようになっている。
【００３８】
鉄筋トラス１０は、長尺に形成されており、デッキプレート１１上にこのデッキプレート１１の面方向に対して平行にかつ互いに間隔を開けて平行に溶接等により固定されている。この鉄筋トラス１０は、２つのラチス材１４と、上端鉄筋１５と、２つの下端鉄筋２とを備えている。
【００３９】
ラチス材１４は、普通鉄線等から構成されており、鉄筋トラス１０の長手方向に沿って互いに間隔を開けて配置される複数の逆Ｖ字状のラチス部１６と、隣接する２つのラチス部１６の下端同士を連結しかつ鉄筋トラス１０の長手方向に対して直角方向の外側に突出する複数のＶ字状の連結突出部１７とを備えている。２つのラチス材１４は上端鉄筋１５を介して断面が逆Ｖ字状となるように配置されており、デッキプレート１１上に連結突出部１７が溶接等により固定されている。ラチス材１４の上端同士の間には、上端鉄筋１５が鉄筋トラス１０の長手方向に対して平行に溶接等により挟着されている。ラチス材１４の下端近傍の外側には、下端鉄筋２が鉄筋トラス１０の長手方向に対して平行に溶接等により固定されている。なお、この実施形態においては、鉄筋トラス１０をデッキプレート１１のリブ１３上に固定しているが、これに限定されるものではなく、例えばリブ１３の下方に隙間が生じるようにデッキプレート１１を折曲等しておき、この隙間に連結突出部１７を挿入してリブ１３と連結突出部１７とをまとめてデッキプレート１１上に溶接等することもできる。
【００４０】
２つの下端鉄筋２の両端部上には、図２に示すように、取付鉄筋１８が下端鉄筋２の長手方向に対してそれぞれ直角に溶接等により架設されている。各取付鉄筋１８の内側かつデッキプレート１１の長手方向の両端部上には、垂直部１９と水平部２０とからＬ字状に形成されたＬ型端部材２１が、水平部２０を外側に向けた状態でそれぞれ溶接等により固定されている。
【００４１】
鉄筋組込デッキ１２は、建物の梁２２上に又は鉄筋コンクリート柱を打設するための型枠（図示せず）上に架設される。鉄筋組込デッキ１２を前記型枠上に架設する場合は、Ｌ型端部材２１の水平部２０の先端を下方へ折曲しておき、この折曲部が鉄筋コンクリート柱に埋設されるようにすることもできる。鉄筋組込デッキ１２の上端鉄筋１５上には、図１及び図２に示すように、複数の配力筋２３が上端鉄筋１５の長手方向に対して直角にかつ互いに間隔を開けて平行に番線等で係止することにより架設されている。また、鉄筋組込デッキ１２のデッキプレート１１上には普通コンクリートや軽量コンクリート等のコンクリートが打設され、ボイド１を含むボイドスラブとしての床スラブ９が施工される。なお、下端鉄筋２や上端鉄筋１５等の鉄筋が配設される床スラブは、この実施形態のような鉄筋組込デッキ１２を備えた床スラブ（デッキプレート合成スラブ）９に限定されるものではなく、場所打ちスラブ（現場打設の床スラブ）、ハーフプレキャスト合成スラブ等であってもよい。
【００４２】
固定材３は、図１、図３〜図５、及び図１０に示すように、隣接する２つの下端鉄筋２に固定されかつボイド１が嵌着されている。この固定材３は、各下端鉄筋２にそれぞれ嵌着される２つのＣ字状の嵌着部２４と、ボイド１が嵌着されるＣ字状のボイド固定部２５と、各嵌着部２４とボイド固定部２５とをそれぞれ連結する２つの支持アーム２６とから構成されている。各支持アーム２６は、ボイド固定部２５の下方の両開口端に斜め下方に向かって広がるように突設されている。また、各支持アーム２６の基端には丸みが付けられており、ボイド１をボイド固定部２５に滑らかに嵌着できるようになっている。嵌着部２４の先端には丸みを付けて外側に開くようにリップ部２７が設けられており、嵌着部２４を下端鉄筋２に滑らかに嵌着できるようになっている。
【００４３】
なお、固定材３が固定される鉄筋は下端鉄筋２に限定されるものではなく、上端鉄筋１５等であってもよい。即ち、この実施形態の固定材３を上下逆にし、支持アーム２６を少し長く形成しておけば、隣接する２つの上端鉄筋１５に固定材３を固定できると共に、ボイド１を下方から支持するように嵌着できる。また、固定材３が固定される鉄筋の数も２つに限定されるものではなく、３つ以上であってもよい。例えば、隣接する２つの上端鉄筋１５と、隣接する２つの下端鉄筋２の合計４つの鉄筋に固定材３を固定することもできる。この場合、固定材３には、４つの嵌着部２４と４つの支持アーム２６を設けておけばよい。このように、嵌着部２４や支持アーム２６も、固定材３が固定される鉄筋の数や鉄筋同士の間隔等に応じて、２つ以上をボイド固定部２５の適宜の位置に設けることができる。また、ボイド１は、各鉄筋間の空間Ａに配設でき、各鉄筋を結ぶ線上に位置していなくてもよい。
【００４４】
この固定材３は、数ｍｍ〜数十ｍｍ幅の帯状の金属板等を折曲等することにより上記の形状に形成されているが、固定材３の材質はこれに限定されるものではなく、鉄線（針金）、ステンレス鋼線、プラスチック棒、帯状の鉄板・ステンレス鋼板・アルミニウム板・プラスチック板等を採用することもできる。プラスチック板やプラスチック棒を構成するプラスチックとしては、ポリプロピレン、ポリエチレン、ポリ塩化ビニル、ＡＢＳ（アクリロニトリル−ブタジエン−スチレン）樹脂、リサイクルプラスチック（ポリエチレンやポリプロピレン等のポリオレフィン系樹脂等からなるリサイクル品）、ＦＲＰ（繊維強化プラスチック）等が挙げられる。
【００４５】
補強鉄筋４は、数十ｃｍ〜数ｍの長さに形成されており、図１、図３乃至図５に示すように、ボイド１の外周の上端の嵌着溝８に、このボイド１の長手方向に対して平行にかつ長手方向に互いに間隔を開けて嵌着することにより複数本埋設されている。なお、補強材は補強鉄筋４に限定されるものではなく、適宜の断面形状の金属棒、ＦＲＰ棒、プラスチック棒等の棒状のもの（補強棒）や面状のものでも構成可能である。面状の補強材としては、金網（ラスを含む）、鉄板、プラスチック板、ＦＲＰ板等が例示でき、貼り付け、埋め込み等によりボイド１に設けることができる。また、補強材の配設位置もボイド１の外周の上端に限定されるものではなく、ボイド１の内部又は外周の適宜の位置に配設できる。更に、補強材をボイド１に埋設せずに、ボイド１の例えば外周の上端にボイド１の長手方向に対して平行に延設したＶ字溝等に載置することにより配設することもできる。この場合、補強材は、布テープ等でボイド１に固定すればよい。
【００４６】
上記のように構成されたボイド１の固定構造によれば、棒状に形成されたボイド１を固定材３に嵌着して配設しているので、ボイド１の位置固定が確実でコンクリートの打設時にもボイド１が固定材３から脱落するおそれがないという利点がある。また、ボイド１は発泡プラスチックから構成されているので、ボイド１の端部の閉塞処理が不要で手間がかからず、安価で重量が小さいと共に、形状の自由度も高く、確実な軽量化が可能であるという利点がある。更に、ボイド１には補強鉄筋４を配設しているので、ボイド１を補強することができる。そのため、固定材３によるボイド１の固定スパン（固定材３同士の間隔）を大きくでき、固定材３の使用数が多くならないと共に、固定材１の取り付けに要する工数も低減化できるという利点がある。
【００４７】
ここで、図３乃至図５に示すように、補強鉄筋４をボイド１の外周の上端に配設し、この補強鉄筋４を固定材１に番線２８等で係止しておけば、ボイド１の長手方向への移動を防止できるという利点がある。また、補強鉄筋４を、隣接する２つの棒体５の両方に掛け渡すように配設しておけば、隣接する２つの棒体５の連結部を補強できると共に、隣接する２つの棒体５を同時に固定できるという利点がある。この場合、長尺な補強鉄筋４を複数の棒体５に掛け渡すように配設することもできる。
【００４８】
補強鉄筋４を番線２８等で固定材３に係止する場合、図３乃至図９に示すように、棒体５の一端５ａの上方の凸部７における外周の上端及び他端５ｂの上方の凸部７における外周の上端に、棒体５の連結後には互いの位置が合う、補強鉄筋４の直径よりも深い切欠溝２９をそれぞれ設けて補強鉄筋４の一部が露出するようにしておけば、番線２８等による係止作業を行い易いという利点がある。なお、切欠溝２９を設けない場合であっても、補強鉄筋４とボイド１の間に番線２８等を介在させておき、番線２８等の両端がはみ出るようにしておけば、番線２８等を固定材３に係止することができる。
【００４９】
また、この実施形態のように、固定材３が既述の２つの嵌着部２４とボイド固定部２５と２つの支持アーム２６とから構成されていれば、固定材３だけでボイド１を固定でき、ボイド１の位置固定もより確実に行えると共に、下端鉄筋２への取り付けやボイド１の固定を簡単に行えるという利点がある。
【００５０】
第２実施形態に係るボイドの固定構造は、図１１に示すように、第１実施形態において、ボイド１に補強鉄筋４等を設けないと共に、固定材３の代わりに、隣接する２つの棒体５の両方に掛け渡すようにしてボイド１の長手方向に対して斜め方向に固定される固定材３１を使用したものである。
【００５１】
固定材３１は、２つの下端鉄筋２に固定されてボイド１を固定した状態では正面視が第１実施形態の固定材３と同様になるが、隣接する２つの棒体５の両方に掛け渡せるようにねじるようにして（螺旋状に）形成されている。なお、図１２示すように、固定材３１の代わりに、２つの固定材３１を平面視がＸ字状となるように互いに固着したような固定材３２等を使用することもできる。また、２つの固定材３１を平面視がＶ字状となるように互いに固着したような固定材等を使用することもできる。更に、金属線、プラスチック線、金属・プラスチック・繊維等からなる糸・紐・ロープ・テープ・布等の線状又は帯状の固定材を使用し、この固定材を下端鉄筋２等の少なくとも２つの鉄筋にボイド１の長手方向に対して斜め方向にかつ互い違いに連続的に（平面視がラチス状に）係止することによりボイド１を固定することもできる。この場合、固定材は、ボイド１の外周の上部や下部の所定範囲に当接させたり、ボイド１の外周の所定範囲に巻き付けたりすることができる。
【００５２】
上記のように構成されたボイド１の固定構造によれば、固定材３１を、隣接する２つの棒体５の両方に掛け渡すようにして固定しているので、ボイド１を補強しなくても、固定材３１によるボイド１の固定スパンを大きくできるという利点がある。その他の利点は第１実施形態と同様である。
【００５３】
第３実施形態に係るボイドの固定構造は、図１３に示すように、第１実施形態において、ボイド１に補強鉄筋４等を設けないと共に、固定材３の代わりに、隣接する２つの上端鉄筋（鉄筋）１５に固定されかつボイド１が嵌着される固定材４１を使用したものである。
【００５４】
固定材４１は、各上端鉄筋１５にそれぞれ嵌着される２つのＣ字状の嵌着部２４と、ボイド１が嵌着されるＣ字状のボイド固定部２５と、各嵌着部２４とボイド固定部２５とをそれぞれ連結する２つの支持アーム２６とから構成されている。各支持アーム２６は、ボイド固定部２５の外周に斜め上方に向かって広がるように突設されている。ボイド固定部２５の下方の両開口端には丸みを付けて外側に開くようにリップ部２７がそれぞれ設けられており、ボイド１を滑らかに嵌着できるようになっている。嵌着部２４の先端にも丸みを付けて外側に開くようにリップ部２７が設けられており、嵌着部２４を上端鉄筋１５に滑らかに嵌着できるようになっている。
【００５５】
固定材４１の上端鉄筋１５への取り付けに際しては、ボイド固定部２５にあらかじめボイド１を嵌着してから各嵌着部２４をそれぞれ上端鉄筋１５に上方から押し込むようにして嵌着してもよいし、あるいは、ボイド１をあらかじめ所定位置に支持してからボイド固定部２５をボイド１に上方から押し込むようにして嵌着し、各嵌着部２４をそれぞれ上端鉄筋１５に上方から押し込むようにして嵌着してもよい。
【００５６】
上記のように構成されたボイド１の固定構造によれば、固定材４１を２つの上端鉄筋１５に固定できるので、固定材４１の取り付け作業を行い易いという利点がある。その他の利点は第１実施形態と同様である。
【００５７】
なお、固定材４１は、発泡プラスチックから棒状に形成されたボイド１の他、スパイラル鋼管等の筒状のボイド等、各種の長尺なボイドの固定に使用することもできる。
【００５８】
第４実施形態に係るボイド１の固定構造は、図１４及び図１５に示すように、第１実施形態において、補強鉄筋４を棒体５の嵌着溝８に嵌着する代わりに、棒体５と同じ長さの補強鉄筋４を棒体５の外周の下端近傍に埋設（配設）し、第１実施形態とほぼ同様の固定材５１を使用すると共に、固定材５１の少なくともボイド固定部２５の開口端部（凸部）２５ａを、ボイド１の外周の側部に形成された移動防止穴（移動防止部）５２にこの移動防止穴５２の天井面５２ａに当接するように挿入したものである。
【００５９】
移動防止穴５２は、棒体５の例えば長手方向の中央部における外周の側部に、棒体５の長手方向に対して直角にかつ固定材５１の幅と略同じ幅となるように形成されている。固定材５１のボイド固定部２５の開口端部２５ａは、移動防止穴５２の側壁５２ｂに達するようにして内側にかつ水平方向に折曲されており、移動防止穴５２の天井面５２ａに当接するように形成されている。移動防止穴５２には、開口端部２５ａと支持アーム２６の上部が挿入されている。なお、固定材５１の形状、移動防止穴５２の数・形成範囲・深さ・断面形状等は特に限定されるものではなく、適宜変更可能である。また、移動防止部は、図１４に示すように、移動防止穴５２等の凹部とすることが好ましいが、凸部とすることも可能であり、固定材５１はそれに当接する形状とすればよい。ボイド固定部２５の一部には、上記のような開口端部２５ａ等の凸部の他、適宜の凹部を設けることもできる。
【００６０】
上記のように構成されたボイド１の固定構造によれば、固定材５１の少なくともボイド固定部２５の開口端部２５ａを移動防止穴５２にこの移動防止穴５２の天井面５２ａに当接するように挿入しているので、ボイド１の位置決め又は固定材５１の位置決めを行い易く、ボイド１の長手方向の移動を確実に防止できると共に、ボイド１の位置固定を確実に行えるという利点がある。また、ボイド１は発泡プラスチックから構成されているので、型内発泡成形又は機械加工等により移動防止穴５２を簡単に形成できるという利点がある。その他の利点は第１実施形態と同様である。
【００６１】
なお、この実施形態においても、固定材５１が固定される鉄筋は下端鉄筋２に限定されるものではなく、上端鉄筋１５等であってもよい。即ち、図１６に示す例のように、固定材５１を上下逆にして構成した固定材５３において、支持アーム２６を少し長く形成しておけば、隣接する２つの上端鉄筋１５に固定材５３を固定できると共に、ボイド１を下方から支持するように嵌着できる。この場合、固定材５３の少なくともボイド固定部２５の開口端部２５ａを移動防止穴５２にこの移動防止穴５２の底面５２ｃに当接するように挿入しておけば、上記の固定材５１の場合と同様の利点がある。
【００６２】
第５実施形態に係るボイド１の固定構造は、図１７及び図１８に示すように、第４実施形態において、補強鉄筋４をボイド１に配設しないと共に、固定材５１の代わりに、第３実施形態の固定材４１に類似する固定材５４を使用したものである。
【００６３】
移動防止穴５２の天井面５２ａは、内側に向かって斜め下方に下るように形成されている。固定材５３のボイド固定部２５の開口端部２５ａは、移動防止穴５２の側壁５２ｂに達するようにして内側にかつ斜め下方に折曲されており、移動防止穴５２の天井面５２ｂに当接するように形成されている。開口端部２５ａの先端にはリップ部２７が設けられており、ボイド１を滑らかに嵌着できるようになっている。移動防止穴５２には、開口端部２５ａが挿入されている。
【００６４】
上記のように構成されたボイド１の固定構造によれば、固定材５４のボイド固定部２５の開口端部２５ａを移動防止穴５２にこの移動防止穴５２の天井面５２ａに当接するように挿入しているので、第４実施形態と同様の利点がある。
【００６５】
なお、移動防止穴５２の天井面５２ａや既述の底面５２ｃは、この実施形態のように、水平面でなく、斜面等として形成されていてもよい。
【００６６】
第６実施形態に係るボイド１の固定構造は、図１９及び図２０に示すように、第１実施形態において、ボイド１に補強鉄筋４等を設ける代わりに、ボイド１の外周の上端に補強テープ６１をボイド１の長手方向に対して平行に貼り付けたものである。
【００６７】
補強テープ６１は、アルミニウム・ステンレス鋼等の金属、ポリ塩化ビニル・ポリプロピレン・ポリエチレン・ポリエステル等のプラスチック、紙、布等から数ｍｍ〜数十ｃｍ幅の帯状に形成されており、ボイド１への貼付面に粘着剤があらかじめ塗布されている。このような補強テープ６１としては、帯状に形成されかつ多数の孔を有するラス網等を採用することもできる。
【００６８】
この補強テープ６１は、図２０に示すように、棒体５の凹部６と凸部７以外の部分の外周の上端に貼り付けることができる。なお、補強テープ６１は、ボイド１の外周の下端にも、ボイド１の長手方向に対して平行に貼り付けることができる。この場合、ボイド１を更に補強することができる。
【００６９】
上記のように構成されたボイド１の固定構造によれば、ボイド１の外周の上端に補強テープ６１を貼り付けているので、ボイド１を補強することができる。そのため、第１実施形態と同様の利点がある。
【００７０】
第７実施形態に係るボイド１の固定構造は、図２１に示すように、第３実施形態において、ボイド１の下方にボイド１の長手方向に対して直角に配設されかつボイド１が載置された支持鉄筋（支持棒）７１を更に備えると共に、固定材４１の代わりに、２つの上端鉄筋１５にボイド１を上方から押さえるように固定される固定材７２を使用したものである。
【００７１】
固定材７２は、各上端鉄筋１５にそれぞれ嵌着される２つのＣ字状の嵌着部２４と、ボイド１を上方から押さえる半円状のボイド押さえ部７３と、各嵌着部２４とボイド押さえ部７３とをそれぞれ連結する２つの支持アーム２６とから構成されている。各支持アーム２６は、ボイド押さえ部７３の下方の両開口端に斜め上方に向かって広がるように突設されている。嵌着部２４は第１実施形態の固定材３と同様に形成されており、嵌着部２４を上端鉄筋１５に滑らかに嵌着できるようになっている。
【００７２】
支持鉄筋７１は、ボイド１の下方の下端鉄筋２上にボイド１の長手方向に対して直角にかつ互いに間隔を開けて平行に番線等で係止することにより架設されており、支持鉄筋７１上にボイド１を載置できるようになっている。ボイド１は、支持鉄筋７１と固定材７２のボイド押さえ部７３との間に保持される。なお、ボイド１とボイド押さえ部７３との間には隙間があってもよく、床スラブ９を構成するコンクリートの打設後にボイド１が浮力により浮き上がった状態でボイド押さえ部７３に保持されるようにすることもできる。また、支持棒は、配力筋としての支持鉄筋等であってもよい。支持棒の材質も、鉄筋の他、適宜の断面形状の金属棒、ＦＲＰ棒、プラスチック棒等であってもよい。支持棒の配設位置も下端鉄筋２上に限定されるものではなく、床スラブ９に水平に埋設可能な適宜の位置に配設することができる。
【００７３】
上記のように構成されたボイド１の固定構造によれば、固定材７２を２つの上端鉄筋１５に固定できるので、第３実施形態と同様の利点がある。
【００７４】
なお、固定材７２は、第３実施形態と同様、発泡プラスチックから棒状に形成されたボイド１の他、スパイラル鋼管等の筒状のボイド等、各種の長尺なボイドの固定に使用することもできる。
【００７５】
第８実施形態に係るボイド１の固定構造は、図２２乃至図２４に示すように、第１実施形態において、固定材３の代わりに、２つの上端鉄筋１５の間に上端鉄筋１５の長手方向に対して直角に架設されかつボイド１が吊着された第７実施形態と同様の支持鉄筋７１を備えたものであって、補強鉄筋４を支持鉄筋（支持棒）７１に番線２８等で係止したものである。
【００７６】
支持鉄筋７１は、上端鉄筋１５の下側に、この上端鉄筋１５の長手方向に対して直角にかつ互いに間隔を開けて平行に番線等で係止することにより架設されている。なお、支持鉄筋７１等の支持棒の配設位置は上端鉄筋１５の下側に限定されるものではなく、床スラブ９に水平に埋設可能な適宜の位置に配設することができる。
【００７７】
上記のように構成されたボイド１の固定構造によれば、ボイド１に補強鉄筋４を配設しているので、ボイド１を補強することができる。そのため、支持鉄筋７１によるボイド１の支持スパン（支持鉄筋７１同士の間隔）を大きくでき、支持鉄筋７１の使用数が多くならないと共に、支持鉄筋７１の取り付けに要する工数も低減化できるという利点がある。また、補強鉄筋４を支持鉄筋７１に係止しているので、ボイド１の長手方向への移動を防止できるという利点がある。その他の利点は第１実施形態と同様である。
【００７８】
第９実施形態に係るボイド１の固定構造は、図２５及び図２６に示すように、第８実施形態において、補強鉄筋４を棒体５の嵌着溝８に嵌着する代わりに、棒体５と同じ長さの補強鉄筋４を棒体５の外周の下端に埋設（配設）すると共に、第７実施形態と同様の支持鉄筋（支持棒）７１を、ボイド１を補強鉄筋４の上方で貫通するようにして架設したものである。
【００７９】
支持鉄筋７１は、棒体５の長手方向の中央部における外周の下端に設けた切欠溝９１の天井面９１ａと補強鉄筋４との隙間９２に挿通された状態で、下端鉄筋２上に、この下端鉄筋２の長手方向に対して直角にかつ互いに間隔を開けて平行に番線等で係止することにより架設されている。そのため、ボイド１は、支持鉄筋７１で支持されていると共に、補強鉄筋４で浮力によるボイド１の浮き上がりを防止できるようになっている。なお、切欠溝９２はボイド１の外周の上端に設けることができるが、この場合、補強鉄筋４は、切欠溝９１に挿入された支持鉄筋７１の上方に位置するように配設しておけばよい。また、支持鉄筋７１をボイド１に貫通可能とするものとしては、開口した切欠溝９１に限定されるものではなく、支持鉄筋７１を挿通可能な貫通孔等であってもよい。即ち、支持鉄筋７１等の支持棒の配設位置は特に限定されるものではなく、床スラブ９に水平に埋設されるボイド１を貫通可能な適宜の位置に配設することができる。
【００８０】
上記のように構成されたボイド１の固定構造によれば、支持鉄筋７１をボイド１に貫通するように配設しているので、番線２８等で係止しなくても、ボイド１の長手方向への移動を防止できるという利点がある。その他の利点は第８実施形態と同様である。
【００８１】
なお、以上の第１乃至第９実施形態の技術は、必要に応じて適宜に組み合わせて実施することもできる。例えば、ボイド１に補強鉄筋４や補強テープ６１を設けていない場合は、既述と同様にしてボイド１に補強鉄筋４や補強テープ６１を設けることによりボイド１を補強することができる。また、図１６に示す既述の例のように、各固定材３、３１、３２、４１、５１、５４等は、少なくとも２つの鉄筋に上下逆に構成したもの等を固定することができる。
【００８２】
【発明の効果】
以上のように、請求項１、請求項２、及び請求項１４の発明によれば、棒状に形成されたボイドを、固定材に嵌着して、固定材で上方から押さえるようにして、又は支持棒が貫通するようにして配設しているので、ボイドの位置固定が確実でコンクリートの打設時にもボイドが固定材から脱落するおそれがない。また、ボイドは発泡プラスチックから構成されているので、ボイドの端部の閉塞処理が不要で手間がかからず、安価で重量が小さいと共に、形状の自由度も高く、確実な軽量化が可能である。更に、ボイドには補強鉄筋を配設しているので、ボイドを補強することができる。そのため、ボイドの固定スパン又は支持スパンを大きくでき、固定材又は支持棒の使用数が多くならないと共に、固定材又は支持棒の取り付けに要する工数も低減化できる。
【００８３】
請求項３の発明によれば、補強材をボイドの外周の上端に配設し、この補強材を固定材に係止しているので、ボイドの長手方向への移動を防止できる。
【００８４】
請求項４の発明によれば、補強材を、隣接する２つの棒体の両方に掛け渡すように配設しているので、隣接する２つの棒体の連結部を補強できると共に、隣接する２つの棒体を同時に固定できる。
【００８５】
請求項５、請求項６、及び請求項１５の発明によれば、ボイドの外周の少なくとも上端に補強テープをボイドの長手方向に対して平行に貼り付けているので、ボイドを補強することができる。そのため、請求項１等と同様の効果がある。
【００８６】
請求項７及び請求項８の発明によれば、請求項１、請求項２、及び請求項４と同様の効果があると共に、固定材が、隣接する２つの棒体の両方に掛け渡すようにしてボイドの長手方向に対して斜め方向に架設されるので、ボイドを補強しなくても、ボイドの固定スパンを大きくできる。
【００８７】
請求項９及び請求項１６の発明によれば、固定材が２つの嵌着部とボイド固定部と２つの支持アームとからなるので、固定材だけでボイドを固定でき、ボイドの位置固定もより確実に行えると共に、鉄筋への取り付けやボイドの固定を簡単に行える。また、固定材を上端鉄筋等の床スラブの上部に位置する鉄筋に固定できるようにしておけば、固定材の取り付け作業を行い易い。
【００８８】
請求項１０、請求項１１、及び請求項１７の発明によれば、固定材の少なくともボイド固定部の一部に設けられた凹部又は凸部を移動防止部に当接するようにしているので、ボイドの位置決め又は固定材の位置決めを行い易く、ボイドの長手方向の移動を確実に防止できると共に、ボイドの位置固定を確実に行える。また、ボイドは発泡プラスチックから構成されているので、型内発泡成形又は機械加工等により移動防止穴等の移動防止部を簡単に形成できる。
【００８９】
請求項１２及び請求項１８の発明によれば、固定材が２つの嵌着部とボイド押さえ部と２つの支持アームとからなるので、ボイドの位置固定を確実に行えると共に、鉄筋への取り付けやボイドの固定を簡単に行える。また、固定材を上端鉄筋等の床スラブの上部に位置する鉄筋に固定できるようにしておけば、固定材の取り付け作業を行い易い。
【００９０】
請求項１３の発明によれば、ボイドに補強材を配設しているので、ボイドを補強することができる。そのため、支持棒によるボイドの支持スパンを大きくでき、支持棒の使用数が多くならないと共に、支持棒の取り付けに要する工数も低減化できる。また、補強材を支持棒に係止しているので、ボイドの長手方向への移動を防止できる。その他の利点は請求項１等と同様である。
【００９１】
請求項１４及び請求項１５の発明によれば、支持棒をボイドに貫通するように配設しているので、ボイドを番線等で係止しなくても、ボイドの長手方向への移動を防止できる。
【００９２】
請求項１９の発明によれば、請求項１６等と同様の効果があると共に、隣接する２つの棒体の両方に掛け渡すようにしてボイドの長手方向に対して斜め方向に架設されるものであるので、ボイドを補強しなくても、ボイドの固定スパンを大きくできる。
【図面の簡単な説明】
【図１】第１実施形態に係るボイドの固定構造を示す要部拡大断面図。
【図２】図１の一部省略側断面図。
【図３】ボイドと下端鉄筋の部分を示す要部拡大概略平面図。
【図４】棒体の連結部付近を示す要部拡大概略平面図。
【図５】図４の正面図。
【図６】棒体の平面図。
【図７】棒体の一端又は他端付近の要部拡大斜視図。
【図８】棒体同士を連結する様子を示す要部拡大平面図。
【図９】図８の正面図。
【図１０】ボイドに補強鉄筋と固定材を取り付ける様子を示す断面図。
【図１１】第２実施形態に係るボイドの固定構造を示す要部拡大概略平面図。
【図１２】Ｘ字状の固定材を使用した例を示す要部拡大概略平面図。
【図１３】第３実施形態に係るボイドの固定構造を示す要部拡大断面図。
【図１４】第４実施形態に係るボイドの固定構造を示す要部拡大断面図。
【図１５】棒体の移動防止穴付近の要部拡大正面図。
【図１６】上端鉄筋に固定可能な固定材を使用した例を示す要部拡大断面図。
【図１７】第５実施形態に係るボイドの固定構造を示す要部拡大断面図。
【図１８】棒体の移動防止穴付近の要部拡大正面図。
【図１９】第６実施形態に係るボイドの固定構造を示す要部拡大断面図。
【図２０】補強テープを外周の上端に貼り付けた棒体の平面図。
【図２１】第７実施形態に係るボイドの固定構造を示す要部拡大断面図。
【図２２】第８実施形態に係るボイドの固定構造を示す要部拡大断面図。
【図２３】棒体の連結部付近を示す要部拡大概略平面図。
【図２４】図２３の正面図。
【図２５】第９実施形態に係るボイドの固定構造を示す要部拡大断面図。
【図２６】切欠溝付近を示す要部拡大側断面図。
【符号の説明】
１ボイド
２下端鉄筋（鉄筋）
Ａ空間
３固定材
４補強鉄筋（補強材）
５棒体
９床スラブ
１５上端鉄筋（鉄筋）
２４嵌着部
２５ボイド固定部
２５ａ開口端部（凸部）
２６支持アーム
３１，３２固定材
４１固定材
５１，５３固定材
５２移動防止穴（移動防止部）
６１補強テープ
７１支持鉄筋（支持棒）
７２固定材
７３ボイド押さえ部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fixing structure of a void buried in a floor slab for reducing the weight of the floor slab of a building and increasing the span of the floor slab, and a fixing material for fixing the void.
[0002]
[Prior art]
Conventional techniques of this type include (1) arranging a plurality of trusses in a formwork, arranging a cylindrical void parallel to the truss between adjacent trusses, and setting the upper side of the void to downward legs. There has been known a building floor structural material or the like in which a holding member having a holding member is held, and a lower portion of a leg of the holding member is locked to the truss (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-303707 (Page 2, Page 3, FIG. 1 and FIG. 2)
[0004]
Also, (2) a method of constructing a void slab by using a fixing metal or the like obtained by processing an iron or stainless steel bar into a front shape capable of inserting two to four voids made of a lightweight material such as styrene foam or the like. It is known (for example, see Patent Document 2).
[0005]
[Patent Document 2]
JP-A-11-107423 (pages 2 to 4, FIGS. 9 and 16)
[0006]
On the other hand, (3) as the holding member for holding the void at a predetermined position, the holding member having a downward leg whose lower portion is locked to the truss, which is used for the building floor structure material of (1) above. Members and the like are known (for example, see Patent Document 1).
[0007]
[Problems to be solved by the invention]
In the building floor structural material of the above (1), cylindrical voids are used for wiring and the like, but the ends of the voids are closed to prevent infiltration of the hardened concrete or the like to be cast. There is a need. Therefore, it takes time and effort to close the end of the void, and if the closing is incomplete, concrete may enter the void or leak water. In this case, there are problems such as insufficient weight reduction and adverse effects due to water accumulated in the voids after solidification of the concrete.
[0008]
Spiral steel pipes are often used as cylindrical voids. However, the voids made of this spiral steel pipe are expensive, heavy, and have a problem that the shape is limited to a cylindrical shape.
[0009]
If the concrete constituting the slab is cast during the construction of the void slab of the above (2), buoyancy acts on the void in the concrete before hardening. However, since the void is made of a lightweight material such as styrene foam and has a low bending strength, the upward deflection due to buoyancy is large. Therefore, in order to suppress the deflection of the void, there is a problem that the fixing span of the void (the interval between the fixing brackets) must be reduced, and a large number of fixing brackets must be used.
[0010]
In addition, since the void is only inserted into the fixture, there is a problem that the position of the void is not reliably fixed.
[0011]
On the other hand, in the holding member of the above (3), it is necessary to lock the lower portions of the legs one by one with a number line or the like at the lower end muscle arranged near the lower end of the truss, so that the mounting work is complicated and There is a problem that the position of the void cannot be reliably fixed.
[0012]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is not necessary to close the end of the void, and it is possible to reliably reduce the weight and position of the void, and to expand the span for fixing the void. It is a first object of the present invention to provide a void fixing structure capable of reducing the number of fixing materials used for fixing a void.
[0013]
It is a second object of the present invention to provide a void fixing member which can be easily attached and can surely fix the position of the void.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the void fixing structure according to claim 1 comprises at least two reinforcing bars horizontally and spaced apart from each other and parallel to each other for constructing a floor slab of a building, and a rod-shaped member made of foamed plastic. A void formed in the space between the at least two rebars and disposed in parallel with the longitudinal direction of the rebar, a fixing member fixed to the at least two rebars and fitted with the voids, Wherein a reinforcing material is disposed inside or on the outer periphery of the void in parallel with the longitudinal direction of the void.
[0015]
3. The void fixing structure according to claim 2, wherein the at least two reinforcing bars are provided horizontally and spaced apart from each other in parallel to construct a floor slab of a building, and the at least two reinforcing bars are made of foamed plastic. A void disposed in a space between two rebars in parallel to the longitudinal direction of the rebar, and a support disposed below the void at a right angle to the longitudinal direction of the void and mounted with the void A void fixing structure comprising a rod and a fixing member fixed to the at least two rebars so as to press the void from above, wherein a reinforcing member is provided inside or around the void in a longitudinal direction of the void. Are arranged in parallel with respect to.
[0016]
In the void fixing structure according to a third aspect, the reinforcing member is disposed at an upper end of the outer periphery of the void, and the reinforcing member is locked to the fixing member.
[0017]
The void fixing structure according to claim 4, wherein the void is formed by connecting a plurality of rods in a longitudinal direction, and the reinforcing member is disposed so as to span both adjacent two rods. is there.
[0018]
6. The void fixing structure according to claim 5, wherein the at least two reinforcing bars are provided horizontally and spaced apart from each other in parallel for constructing a floor slab of a building, and the at least two reinforcing bars are formed of foamed plastic. A void fixing structure comprising: a void disposed in a space between two rebars in parallel with a longitudinal direction of the rebar; and a fixing member fixed to the at least two rebars and having the void fitted therein. The reinforcing tape is attached to at least the upper end of the outer periphery of the void in parallel with the longitudinal direction of the void.
[0019]
7. The void fixing structure according to claim 6, wherein the at least two reinforcing bars are provided horizontally and spaced apart from each other and parallel to each other for constructing a floor slab of a building; A void disposed in a space between two rebars in parallel to the longitudinal direction of the rebar, and a support disposed below the void at a right angle to the longitudinal direction of the void and mounted with the void A void fixing structure comprising: a rod; and a fixing member fixed to the at least two rebars so as to press the void from above, wherein a reinforcing tape is provided on at least an upper end of an outer periphery of the void with a longitudinal length of the void. It is attached parallel to the direction.
[0020]
8. The void fixing structure according to claim 7, wherein the at least two reinforcing bars are provided horizontally and spaced apart from each other and parallel to construct a floor slab of a building, and the at least two reinforcing bars are formed of foamed plastic and have a rod shape. A void fixing structure comprising: a void disposed in a space between two rebars in parallel with a longitudinal direction of the rebar; and a fixing member fixed to the at least two rebars and having the void fitted therein. Wherein the void is formed by connecting a plurality of rods in the longitudinal direction, and the fixing member extends obliquely with respect to the longitudinal direction of the voids so as to span both adjacent two rods. It is fixed to.
[0021]
9. The void fixing structure according to claim 8, wherein the at least two reinforcing bars are provided horizontally and spaced apart from each other in parallel to construct a floor slab of a building, and the at least two reinforcing bars are formed of foamed plastic. A void disposed in a space between two rebars in parallel to the longitudinal direction of the rebar, and a support disposed below the void at a right angle to the longitudinal direction of the void and mounted with the void A void fixing structure comprising a rod and a fixing member fixed to the at least two rebars so as to press the void from above, wherein the void connects a plurality of rods in a longitudinal direction. The fixing member is fixed in a direction oblique to the longitudinal direction of the void so as to extend over both of the two adjacent rods.
[0022]
In the void fixing structure according to the ninth aspect, the fixing member has at least two fitting portions fitted to the respective reinforcing bars, a void fixing portion to which the void is fitted, and each fitting portion. And at least two support arms respectively connecting the void fixing portions.
[0023]
The void fixing structure according to claim 10, wherein a concave portion or a convex portion provided at least in a part of the void fixing portion is brought into contact with a movement preventing portion formed on a side portion of an outer periphery of the void. is there.
[0024]
12. The void fixing structure according to claim 11, wherein the at least two reinforcing bars are arranged horizontally and spaced apart from each other in parallel to construct a floor slab of a building, and the at least two reinforcing bars are formed of foamed plastic. A void fixing structure comprising: a void disposed in a space between two rebars in parallel with a longitudinal direction of the rebar; and a fixing member fixed to the at least two rebars and having the void fitted therein. Wherein the fixing member connects at least two fitting portions each fitted to each reinforcing bar, a void fixing portion to which the void is fitted, and each fitting portion and the void fixing portion. And at least two recesses or projections provided on at least a part of the void fixing portion are brought into contact with a movement preventing portion formed on a side portion of an outer periphery of the void. Those were.
[0025]
In the void fixing structure of the twelfth aspect, the fixing member has at least two fitting portions fitted to the respective rebars, a void pressing portion for pressing the void from above, each fitting portion and the void. And at least two support arms respectively connecting the holding portions.
[0026]
14. The void fixing structure according to claim 13, wherein the support rod is buried horizontally in a floor slab of a building, and is formed in a rod shape from foamed plastic so as to be horizontal to the support rod and perpendicular to the longitudinal direction of the support rod. And a suspended void, comprising a void fixing structure, wherein a reinforcing material is disposed at an upper end of an outer periphery of the void in parallel with a longitudinal direction of the void, and the reinforcing material is attached to the support rod. It is locked.
[0027]
A void fixing structure according to claim 14, wherein the void is formed in a rod shape from foamed plastic and is horizontally embedded in a floor slab of a building, and penetrates the void horizontally and at right angles to the longitudinal direction of the void. And a support rod disposed in the void, wherein a reinforcing member is disposed inside or on the outer periphery of the void in parallel with the longitudinal direction of the void.
[0028]
The void fixing structure according to claim 15, wherein the void is formed in a rod shape from foamed plastic and is horizontally embedded in a floor slab of a building, and penetrates the void horizontally and at right angles to the longitudinal direction of the void. And a support rod disposed in the void, wherein a reinforcing tape is attached to at least an upper end of an outer periphery of the void in parallel with a longitudinal direction of the void.
[0029]
In addition, the void fixing material according to claim 16 is characterized in that a long void is provided in a space between at least two reinforcing bars which are horizontally and spaced apart from each other and arranged in parallel to construct a floor slab of a building. A void fixing member for fixing parallel to the longitudinal direction of the reinforcing bar, at least two fitting portions respectively fitted to the respective reinforcing bars, a void fixing portion to which the void is fitted, And at least two support arms for respectively connecting the fitting portion and the void fixing portion.
[0030]
18. The void fixing material according to claim 17, wherein at least a concave portion or a convex portion provided on a part of the void fixing portion is brought into contact with a movement preventing portion formed on a side portion of an outer periphery of the void. It is.
[0031]
19. The void anchoring material of claim 18, wherein a long void is provided in the space between at least two rebars that are horizontally and spaced apart and parallel to each other for constructing a floor slab of a building. A fixing material for voids for fixing in parallel to the longitudinal direction, wherein at least two fitting portions respectively fitted to the respective rebars, a void pressing portion for pressing the voids from above, and each fitting portion And at least two support arms respectively connecting the void holding portion.
[0032]
The void fixing material according to claim 19 is fixed to the at least two rebars in a direction oblique to the longitudinal direction of the void.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The fixing structure of the void 1 according to the first embodiment includes two lower reinforcing bars (rebars) 2, a void 1, and a fixing member 3, as shown in FIGS. 1 to 5. A reinforcing reinforcing bar (reinforcing material) 4 is buried (arranged) at the upper end of the outer periphery in parallel with the longitudinal direction of the void 1.
[0034]
The void 1 is formed in a round bar shape having a length of several tens of cm to several tens of meters from foamed plastic, and is disposed in a space A between two adjacent lower end reinforcing bars 2 in parallel to the longitudinal direction of the lower end reinforcing bars 2. Have been. Examples of the foamed plastic include foamed polystyrene, foamed polyurethane, foamed polyethylene, foamed polypropylene, and the like. The cross-sectional shape of the void 1 is not limited to a circular shape, but may be an elliptical shape, a bale shape, an inverted trapezoidal shape, a rectangular shape, or the like.
[0035]
As shown in FIGS. 3 to 9, the void 1 is formed by connecting a plurality of rods 5 each having a length of several tens of cm to several meters made of foamed plastic in the longitudinal direction. As shown in FIGS. 6 to 9, two protrusions 7 each having a quarter circle in front view are provided at one end 5 a of the rod body 5 by opposing two recesses 6 each having a quarter circle in front view. They are provided facing each other. The other end 5b of the rod 5 is adjacent to the other end 5b by providing two quadrant-shaped concave portions 6 facing each other in which the respective protrusions 7 of the one end 5a of the adjacent rod 5 are fitted. Two convex portions 7 each having a quarter-circle shape when viewed from the front and fitted into each concave portion 6 of one end 5a of the rod 5 are provided to face each other. At the upper end of the outer periphery of the rod 5, as shown in FIGS. 3 to 10, a fitting groove 8 having a C-shaped cross section opened upward is formed in parallel with the longitudinal direction of the rod 5. I have. As shown in FIGS. 8 and 9, the rods 5 are fitted with each other by fitting two protrusions 7 of the other rod 5 into two recesses 6 of one rod 5. 8 can be connected in an aligned state. When the plurality of rods 5 are connected in the longitudinal direction to form the void 1, the fixing of the voids 1 by the fixing material 3 is desirably performed at the connection portion of the rods 5 as in this embodiment.
[0036]
As shown in FIGS. 1 and 2, the lower end reinforcing bars 2 are arranged horizontally and parallel to each other with an interval therebetween in order to construct a floor slab 9 of a building. The lower end reinforcing bar 2 forms a part of the reinforcing bar truss 10 and is incorporated in a reinforcing bar built-in deck 12 having a deck plate 11 and a plurality of reinforcing bar trusses 10.
[0037]
The deck plate 11 is made of a hot-dip galvanized steel plate or the like, and a plurality of ribs 13 are provided in parallel at intervals. The ribs 13 are formed by appropriately bending a predetermined range of the deck plate 11. Between the two adjacent ribs 13 on the deck plate 11, a peak portion and a valley portion are formed in a wavy shape so as to be perpendicular to the longitudinal direction of the rib 13 (not shown). The width of the deck plate 11 is, for example, several tens of cm, and one end of the deck plate 11 in the width direction (a direction perpendicular to the longitudinal direction of the reinforced truss 10) and the other end have a longitudinal direction. Extending hook portions 11a and 11b are provided, respectively. Two adjacent deck plates 11 can be connected in the width direction by locking the hook portions 11a and 11b at one end and the other end with each other.
[0038]
The reinforcing bar truss 10 is formed in a long shape, and is fixed on the deck plate 11 by welding or the like in parallel with the surface direction of the deck plate 11 and at a distance from each other. The reinforcing bar truss 10 includes two lattice members 14, an upper reinforcing bar 15, and two lower reinforcing bars 2.
[0039]
The lattice member 14 is made of ordinary iron wire or the like, and includes a plurality of inverted V-shaped lattice parts 16 arranged at intervals along the longitudinal direction of the reinforcing truss 10 and two adjacent lattice parts 16. And a plurality of V-shaped connecting projections 17 projecting outward in a direction perpendicular to the longitudinal direction of the reinforced truss 10. The two lattice members 14 are disposed so as to have an inverted V-shaped cross section via the upper end reinforcing bar 15, and the connecting protrusion 17 is fixed on the deck plate 11 by welding or the like. An upper reinforcing bar 15 is sandwiched between upper ends of the lattice members 14 by welding or the like in parallel with the longitudinal direction of the reinforcing truss 10. Outside the vicinity of the lower end of the lattice member 14, the lower end reinforcing bar 2 is fixed by welding or the like in parallel with the longitudinal direction of the reinforcing truss 10. In this embodiment, the reinforcing truss 10 is fixed on the ribs 13 of the deck plate 11, but the present invention is not limited to this. For example, the deck plate 11 is fixed so that a gap is formed below the ribs 13. The ribs 13 and the connecting protrusions 17 can be welded together on the deck plate 11 by inserting the connecting protrusions 17 into the gaps and bending the ribs 13 and the connecting protrusions 17 together.
[0040]
As shown in FIG. 2, on both ends of the two lower reinforcing bars 2, mounting reinforcing bars 18 are installed by welding or the like at right angles to the longitudinal direction of the lower reinforcing bar 2. An L-shaped end member 21 formed in an L-shape from a vertical portion 19 and a horizontal portion 20 on the inner side of each mounting bar 18 and on both ends in the longitudinal direction of the deck plate 11 directs the horizontal portion 20 outward. In each state, they are fixed by welding or the like.
[0041]
The reinforcing bar built-in deck 12 is erected on a beam 22 of a building or on a formwork (not shown) for driving reinforced concrete columns. When the reinforcing bar built-in deck 12 is installed on the formwork, the tip of the horizontal portion 20 of the L-shaped end member 21 is bent downward so that the bent portion is embedded in the reinforced concrete column. You can also. As shown in FIGS. 1 and 2, a plurality of distributing bars 23 are perpendicular to the longitudinal direction of the upper reinforcing bar 15 and parallel to the upper reinforcing bar 15 of the reinforcing bar built-in deck 12 at intervals. It is erected by locking it with the like. Concrete, such as ordinary concrete or lightweight concrete, is cast on the deck plate 11 of the reinforcing bar built-in deck 12, and a floor slab 9 as a void slab including the void 1 is constructed. The floor slab on which the reinforcing bars such as the lower reinforcing bar 2 and the upper reinforcing bar 15 are disposed is not limited to the floor slab (deck plate composite slab) 9 including the reinforcing bar built-in deck 12 as in this embodiment. Instead, a cast-in-place slab (floor slab cast in place), a half precast composite slab, or the like may be used.
[0042]
As shown in FIGS. 1, 3 to 5, and 10, the fixing member 3 is fixed to two adjacent lower end reinforcing bars 2 and the void 1 is fitted thereto. The fixing member 3 includes two C-shaped fitting portions 24 respectively fitted to the lower end reinforcing bars 2, a C-shaped void fixing portion 25 to which the void 1 is fitted, and each fitting portion 24. And two support arms 26 connecting the void fixing portion 25 and the support member 26 respectively. Each support arm 26 is provided at both open ends below the void fixing portion 25 so as to extend obliquely downward. The base end of each support arm 26 is rounded, so that the void 1 can be smoothly fitted to the void fixing portion 25. A lip portion 27 is provided at the tip of the fitting portion 24 so as to be rounded and open outward, so that the fitting portion 24 can be smoothly fitted to the lower reinforcing bar 2.
[0043]
The reinforcing bar to which the fixing member 3 is fixed is not limited to the lower reinforcing bar 2 but may be the upper reinforcing bar 15 or the like. That is, if the fixing member 3 of this embodiment is turned upside down and the support arm 26 is formed slightly longer, the fixing member 3 can be fixed to two adjacent upper end reinforcing bars 15 and the void 1 is supported from below. Can be fitted to Further, the number of reinforcing bars to which the fixing member 3 is fixed is not limited to two, but may be three or more. For example, the fixing member 3 can be fixed to a total of four rebars, that is, two adjacent upper rebars 15 and two adjacent lower rebars 2. In this case, the fixing member 3 may be provided with four fitting portions 24 and four support arms 26. As described above, two or more fitting portions 24 and support arms 26 may be provided at appropriate positions of the void fixing portion 25 according to the number of reinforcing bars to which the fixing member 3 is fixed, the interval between the reinforcing bars, and the like. it can. Further, the void 1 can be disposed in the space A between the reinforcing bars, and does not have to be located on a line connecting the reinforcing bars.
[0044]
The fixing member 3 is formed in the above-mentioned shape by bending a band-shaped metal plate or the like having a width of several mm to several tens mm, but the material of the fixing member 3 is not limited to this. , An iron wire (wire), a stainless steel wire, a plastic rod, a strip-shaped iron plate, a stainless steel plate, an aluminum plate, a plastic plate, or the like can also be used. Examples of the plastic constituting the plastic plate and the plastic rod include polypropylene, polyethylene, polyvinyl chloride, ABS (acrylonitrile-butadiene-styrene) resin, recycled plastic (recycled product composed of polyolefin resin such as polyethylene and polypropylene), FRP ( Fiber-reinforced plastic).
[0045]
The reinforcing reinforcing bar 4 is formed to have a length of several tens of cm to several meters, and as shown in FIGS. 1 and 3 to 5, is fitted into the fitting groove 8 at the upper end of the outer periphery of the void 1. A plurality of them are buried by being fitted parallel to the longitudinal direction and at intervals in the longitudinal direction. In addition, the reinforcing material is not limited to the reinforcing reinforcing bar 4 and may be a bar (a reinforcing bar) such as a metal bar, an FRP bar, or a plastic bar having an appropriate cross-sectional shape, or a planar member. Examples of the planar reinforcing material include a wire mesh (including a lath), an iron plate, a plastic plate, an FRP plate, and the like, and can be provided in the void 1 by pasting, embedding, or the like. Further, the position of the reinforcing member is not limited to the upper end of the outer periphery of the void 1, but may be arranged at an appropriate position inside or outside the void 1. Further, the reinforcing member may be provided by placing the reinforcing member in a V-shaped groove extending in parallel to the longitudinal direction of the void 1 at the upper end of the outer periphery of the void 1 without embedding the reinforcing material in the void 1, for example. . In this case, the reinforcing material may be fixed to the void 1 with a cloth tape or the like.
[0046]
According to the fixing structure of the void 1 configured as described above, since the rod-shaped void 1 is fitted and disposed on the fixing member 3, the position of the void 1 is reliably fixed, and the concrete is driven. There is an advantage that the void 1 does not fall off the fixing member 3 at the time of installation. In addition, since the void 1 is made of foamed plastic, it is not necessary to close the end of the void 1 and it is not troublesome, and it is inexpensive, has a small weight, has a high degree of freedom in shape, and has a reliable weight reduction. There is an advantage that it is possible. Further, since the reinforcing reinforcing bar 4 is provided in the void 1, the void 1 can be reinforced. Therefore, there is an advantage that the fixing span of the void 1 by the fixing member 3 (the interval between the fixing members 3) can be increased, the number of the fixing members 3 used does not increase, and the man-hour required for attaching the fixing member 1 can be reduced. .
[0047]
Here, as shown in FIGS. 3 to 5, the reinforcing bar 4 is disposed at the upper end of the outer periphery of the void 1, and the reinforcing bar 4 is locked to the fixing member 1 by a wire 28 or the like. Has the advantage that it can be prevented from moving in the longitudinal direction. Further, if the reinforcing bar 4 is arranged so as to span both of the two adjacent rods 5, the connecting portion between the two adjacent rods 5 can be reinforced, and the two adjacent rods 5 can be reinforced. Can be fixed simultaneously. In this case, the long reinforcing reinforcing bar 4 can be arranged so as to span the plurality of rods 5.
[0048]
When the reinforcing reinforcing bar 4 is locked to the fixing member 3 by the number line 28 or the like, as shown in FIGS. At the upper end of the outer periphery of the projection 7, cutout grooves 29 that are aligned with each other after the rods 5 are connected and that are deeper than the diameter of the reinforcing bar 4 are provided so that a portion of the reinforcing bar 4 is exposed. For example, there is an advantage that the locking operation by the line 28 or the like can be easily performed. Even when the notch groove 29 is not provided, the wire 28 and the like are fixed between the reinforcing bar 4 and the void 1 by interposing the wire 28 and the like so that both ends of the wire 28 and the like protrude. It can be locked to the material 3.
[0049]
Further, as in this embodiment, if the fixing member 3 is composed of the two fitting portions 24, the void fixing portions 25, and the two support arms 26, the void 1 is fixed only by the fixing member 3. There is an advantage that the position of the void 1 can be fixed more reliably, and the attachment to the lower end reinforcing bar 2 and the fixing of the void 1 can be easily performed.
[0050]
As shown in FIG. 11, the void fixing structure according to the second embodiment differs from the first embodiment in that the reinforcing bar 4 and the like are not provided in the void 1 and two adjacent rods are used instead of the fixing member 3. 5, a fixing member 31 is used which is fixed in a diagonal direction to the longitudinal direction of the void 1 so as to bridge both of them.
[0051]
In a state where the fixing member 31 is fixed to the two lower reinforcing bars 2 and the void 1 is fixed, the front view is the same as the fixing member 3 of the first embodiment in a front view, but can be bridged over both of the two adjacent rods 5. (Spiral). In addition, as shown in FIG. 12, instead of the fixing member 31, a fixing member 32 or the like in which two fixing members 31 are fixed to each other so as to form an X-shape in plan view can be used. Further, a fixing member or the like in which the two fixing members 31 are fixed to each other so as to form a V-shape in plan view can also be used. Further, a linear or band-shaped fixing material such as a metal wire, a plastic wire, a thread, a string, a rope, a tape, a cloth, or the like made of metal, plastic, fiber, or the like is used. The void 1 can also be fixed to the reinforcing bar by continuously and alternately (in a lattice shape in plan view) obliquely and alternately with respect to the longitudinal direction of the void 1. In this case, the fixing member can be brought into contact with a predetermined range on the upper or lower part of the outer periphery of the void 1 or wound around a predetermined range on the outer periphery of the void 1.
[0052]
According to the fixing structure of the void 1 configured as described above, since the fixing member 31 is fixed so as to span both of the two adjacent rods 5, it is not necessary to reinforce the void 1. There is an advantage that the fixing span of the void 1 by the fixing material 31 can be increased. Other advantages are the same as in the first embodiment.
[0053]
As shown in FIG. 13, the void fixing structure according to the third embodiment is different from the first embodiment in that the reinforcing bar 4 and the like are not provided in the void 1 and two adjacent upper reinforcing bars are used instead of the fixing member 3. (Reinforcing Bar) The fixing member 41 is used, which is fixed to the reinforcing bar 15 and to which the void 1 is fitted.
[0054]
The fixing member 41 includes two C-shaped fitting portions 24 respectively fitted to the upper reinforcing bars 15, a C-shaped void fixing portion 25 to which the void 1 is fitted, and each fitting portion 24. And two support arms 26 for connecting the void fixing portions 25 to each other. Each support arm 26 is provided on the outer periphery of the void fixing portion 25 so as to extend obliquely upward. Lip portions 27 are provided at both open ends below the void fixing portion 25 so as to be rounded and open outward, so that the void 1 can be fitted smoothly. A lip 27 is also provided so that the tip of the fitting portion 24 is rounded and opened outward, so that the fitting portion 24 can be smoothly fitted to the upper end reinforcing bar 15.
[0055]
When attaching the fixing member 41 to the upper reinforcing bar 15, the void 1 may be fitted to the void fixing portion 25 in advance, and then each fitting portion 24 may be pressed into the upper reinforcing bar 15 from above. Alternatively, the void 1 is supported in a predetermined position in advance, and then the void fixing portion 25 is fitted into the void 1 by being pushed from above, and each fitting portion 24 is pushed into the upper reinforcing bar 15 from above. It may be fitted.
[0056]
According to the fixing structure of the void 1 configured as described above, since the fixing member 41 can be fixed to the two upper reinforcing bars 15, there is an advantage that the fixing member 41 can be easily attached. Other advantages are the same as in the first embodiment.
[0057]
In addition, the fixing material 41 can be used for fixing various long voids such as a cylindrical void such as a spiral steel pipe in addition to the void 1 formed in a rod shape from foamed plastic.
[0058]
As shown in FIGS. 14 and 15, the fixing structure of the void 1 according to the fourth embodiment is different from the first embodiment in that, instead of fitting the reinforcing reinforcing bar 4 into the fitting groove 8 of the bar 5, A reinforcing bar 4 having the same length as that of the bar 5 is buried (disposed) near the lower end of the outer periphery of the rod 5, and the same fixing member 51 as that of the first embodiment is used. 25 in which an open end (convex portion) 25a is inserted into a movement prevention hole (movement prevention portion) 52 formed on a side portion of the outer periphery of the void 1 so as to contact the ceiling surface 52a of the movement prevention hole 52. It is.
[0059]
The movement preventing hole 52 is formed, for example, on the side of the outer periphery at a central portion in the longitudinal direction of the rod body 5 so as to be perpendicular to the longitudinal direction of the rod body 5 and to have substantially the same width as the width of the fixing member 51. ing. The opening end 25a of the void fixing portion 25 of the fixing member 51 is bent inward and horizontally so as to reach the side wall 52b of the movement prevention hole 52, and abuts on the ceiling surface 52a of the movement prevention hole 52. It is formed as follows. The opening end 25 a and the upper part of the support arm 26 are inserted into the movement prevention hole 52. The shape of the fixing member 51 and the number, range, depth, cross-sectional shape, and the like of the movement prevention holes 52 are not particularly limited, and can be appropriately changed. Further, as shown in FIG. 14, the movement preventing portion is preferably formed as a concave portion such as the movement preventing hole 52, but may be formed as a convex portion, and the fixing member 51 may be formed in a shape abutting thereon. . A part of the void fixing portion 25 may be provided with an appropriate concave portion in addition to the convex portion such as the opening end portion 25a as described above.
[0060]
According to the void 1 fixing structure configured as described above, at least the opening end 25 a of the void fixing portion 25 of the fixing member 51 is brought into contact with the movement prevention hole 52 and the ceiling surface 52 a of the movement prevention hole 52. Since it is inserted, the positioning of the void 1 or the positioning of the fixing member 51 is easy, and the longitudinal movement of the void 1 can be reliably prevented, and the position of the void 1 can be reliably fixed. Further, since the void 1 is made of foamed plastic, there is an advantage that the movement preventing hole 52 can be easily formed by in-mold foam molding or machining. Other advantages are the same as in the first embodiment.
[0061]
Also in this embodiment, the reinforcing bar to which the fixing member 51 is fixed is not limited to the lower reinforcing bar 2 but may be the upper reinforcing bar 15 or the like. That is, as in the example shown in FIG. 16, if the support arm 26 is formed slightly longer in the fixing member 53 in which the fixing member 51 is turned upside down, the fixing member 53 is attached to two adjacent upper reinforcing bars 15. It can be fixed and fitted so as to support the void 1 from below. In this case, if at least the opening end 25a of the void fixing portion 25 of the fixing member 53 is inserted into the movement preventing hole 52 so as to be in contact with the bottom surface 52c of the movement preventing hole 52, the same as the case of the fixing member 51 described above. There are similar advantages.
[0062]
As shown in FIGS. 17 and 18, the fixing structure of the void 1 according to the fifth embodiment differs from the fourth embodiment in that the reinforcing reinforcing bar 4 is not provided in the void 1 and the third reinforcing member 51 is used instead of the fixing member 51. The fixing member 54 similar to the fixing member 41 of the embodiment is used.
[0063]
The ceiling surface 52a of the movement prevention hole 52 is formed so as to descend obliquely downward toward the inside. The opening end 25a of the void fixing portion 25 of the fixing material 53 is bent inward and obliquely downward so as to reach the side wall 52b of the movement prevention hole 52, and abuts on the ceiling surface 52b of the movement prevention hole 52. It is formed as follows. A lip 27 is provided at the tip of the open end 25a so that the void 1 can be fitted smoothly. The opening end 25a is inserted into the movement prevention hole 52.
[0064]
According to the void 1 fixing structure configured as described above, the opening end 25 a of the void fixing portion 25 of the fixing member 54 is inserted into the movement preventing hole 52 so as to contact the ceiling surface 52 a of the movement preventing hole 52. Therefore, there is an advantage similar to that of the fourth embodiment.
[0065]
Note that the ceiling surface 52a and the above-described bottom surface 52c of the movement prevention hole 52 may be formed as a slope instead of a horizontal plane as in this embodiment.
[0066]
As shown in FIGS. 19 and 20, the fixing structure of the void 1 according to the sixth embodiment is different from the first embodiment in that the reinforcing bar 4 and the like are provided in the void 1 and a reinforcing tape is provided on the upper end of the outer periphery of the void 1. 61 is attached in parallel to the longitudinal direction of the void 1.
[0067]
The reinforcing tape 61 is formed from a metal such as aluminum or stainless steel, a plastic such as polyvinyl chloride / polypropylene / polyethylene / polyester, a paper, a cloth, or the like into a strip having a width of several mm to several tens cm. An adhesive has been applied to the application surface in advance. As such a reinforcing tape 61, a lath net or the like formed in a band shape and having a large number of holes can be adopted.
[0068]
As shown in FIG. 20, this reinforcing tape 61 can be attached to the upper end of the outer periphery of the portion other than the concave portion 6 and the convex portion 7 of the rod 5. The reinforcing tape 61 can be attached to the lower end of the outer periphery of the void 1 in parallel with the longitudinal direction of the void 1. In this case, the void 1 can be further reinforced.
[0069]
According to the fixing structure of the void 1 configured as described above, since the reinforcing tape 61 is attached to the upper end of the outer periphery of the void 1, the void 1 can be reinforced. Therefore, there is an advantage similar to that of the first embodiment.
[0070]
As shown in FIG. 21, the fixing structure of the void 1 according to the seventh embodiment is arranged below the void 1 at a right angle to the longitudinal direction of the void 1 and places the void 1 in the third embodiment, as shown in FIG. In addition to the supporting bar (support rod) 71 provided, a fixing member 72 fixed to the two upper reinforcing bars 15 so as to press the void 1 from above is used instead of the fixing member 41.
[0071]
The fixing member 72 includes two C-shaped fitting portions 24 fitted to the upper end rebars 15, a semicircular void pressing portion 73 for pressing the void 1 from above, and the fitting portions 24 and the voids. It is composed of two support arms 26 that respectively connect the holding portions 73. Each support arm 26 is provided at both open ends below the void holding portion 73 so as to extend obliquely upward. The fitting portion 24 is formed in the same manner as the fixing member 3 of the first embodiment, so that the fitting portion 24 can be smoothly fitted to the upper reinforcing bar 15.
[0072]
The supporting reinforcing bar 71 is installed on the lower reinforcing bar 2 below the void 1 by being hooked at right angles to the longitudinal direction of the void 1 and parallel to each other with a space therebetween with a wire or the like. The void 1 can be placed on the bottom. The void 1 is held between the support rebar 71 and the void holding portion 73 of the fixing member 72. In addition, a gap may be provided between the void 1 and the void pressing portion 73 so that the void 1 is held by the void pressing portion 73 in a state of being lifted by buoyancy after the concrete forming the floor slab 9 is poured. You can also Further, the support bar may be a support reinforcing bar or the like as a distribution bar. The material of the support rod may be a metal rod, an FRP rod, a plastic rod, or the like having an appropriate cross-sectional shape in addition to the reinforcing bar. The disposition position of the support rod is not limited to the lower end reinforcing bar 2, but can be disposed at an appropriate position that can be buried horizontally in the floor slab 9.
[0073]
According to the fixing structure of the void 1 configured as described above, since the fixing member 72 can be fixed to the two upper reinforcing bars 15, there is an advantage similar to that of the third embodiment.
[0074]
In addition, similarly to the third embodiment, the fixing member 72 can be used for fixing various long voids such as a cylindrical void such as a spiral steel pipe in addition to the void 1 formed in a rod shape from foamed plastic. it can.
[0075]
As shown in FIGS. 22 to 24, the fixing structure of the void 1 according to the eighth embodiment differs from the first embodiment in that the fixing member 3 is replaced with two upper reinforcing bars 15 in the longitudinal direction of the upper reinforcing bar 15 in the first embodiment. And a supporting bar 71 similar to that of the seventh embodiment, which is installed at a right angle to the first embodiment and has the voids 1 suspended therefrom, and the reinforcing bar 4 is connected to the supporting bar (support bar) 71 by a wire 28 or the like. It is stopped.
[0076]
The supporting reinforcing bar 71 is provided below the upper reinforcing bar 15 by being hooked at right angles to the longitudinal direction of the upper reinforcing bar 15 and parallel to each other at intervals with a wire or the like. In addition, the disposition position of the support bar such as the support rebar 71 is not limited to the lower side of the upper rebar 15, and can be disposed at an appropriate position that can be buried horizontally in the floor slab 9.
[0077]
According to the fixing structure of the void 1 configured as described above, since the reinforcing reinforcing bar 4 is provided in the void 1, the void 1 can be reinforced. Therefore, there is an advantage that the support span of the void 1 by the support rebar 71 (interval between the support rebars 71) can be increased, the number of use of the support rebar 71 does not increase, and the man-hour required for mounting the support rebar 71 can be reduced. . Further, since the reinforcing reinforcing bar 4 is locked to the supporting reinforcing bar 71, there is an advantage that the movement of the void 1 in the longitudinal direction can be prevented. Other advantages are the same as in the first embodiment.
[0078]
As shown in FIGS. 25 and 26, the fixing structure of the void 1 according to the ninth embodiment is different from the eighth embodiment in that, instead of fitting the reinforcing reinforcing bar 4 into the fitting groove 8 of the rod 5, a rod is used. The reinforcing bar 4 having the same length as the reinforcing bar 4 is embedded (arranged) at the lower end of the outer periphery of the rod 5, and the supporting bar (supporting bar) 71 similar to that of the seventh embodiment is attached to the void 1 above the reinforcing bar 4. It is constructed so as to penetrate with.
[0079]
The support reinforcing bar 71 is inserted into the gap 92 between the reinforcing bar 4 and the ceiling surface 91a of the cutout groove 91 provided at the lower end of the outer periphery at the center in the longitudinal direction of the rod 5, and The lower reinforcing bar 2 is erected at right angles to the longitudinal direction of the lower reinforcing bar 2 and parallel to each other at intervals with a wire or the like. Therefore, the void 1 is supported by the supporting reinforcing bar 71, and the reinforcing bar 4 can prevent the void 1 from rising due to buoyancy. Note that the notch groove 92 can be provided at the upper end of the outer periphery of the void 1. In this case, the reinforcing reinforcing bar 4 is provided so as to be located above the supporting reinforcing bar 71 inserted into the notch groove 91. Good. Further, the material that allows the support reinforcing bar 71 to penetrate the void 1 is not limited to the open cutout groove 91, but may be a through hole or the like through which the support reinforcing bar 71 can be inserted. That is, the position at which the support rods such as the support reinforcing bars 71 are disposed is not particularly limited, and the support rods can be disposed at appropriate positions that can penetrate the voids 1 buried horizontally in the floor slab 9.
[0080]
According to the fixed structure of the void 1 configured as described above, since the supporting reinforcing bar 71 is provided so as to penetrate the void 1, the longitudinal direction of the void 1 can be secured without being locked by the wire 28 or the like. There is an advantage that the movement to the can be prevented. Other advantages are the same as in the eighth embodiment.
[0081]
The techniques of the first to ninth embodiments can be appropriately combined and implemented as needed. For example, when the reinforcing bar 4 and the reinforcing tape 61 are not provided in the void 1, the void 1 can be reinforced by providing the reinforcing bar 4 and the reinforcing tape 61 in the void 1 as described above. Further, as in the above-described example shown in FIG. 16, each of the fixing members 3, 31, 32, 41, 51, 54, etc., can be fixed to at least two rebars, for example, upside down.
[0082]
【The invention's effect】
As described above, according to the first, second, and fourteenth aspects of the present invention, the rod-shaped void is fitted to the fixing member and pressed from above by the fixing member, or Since the support rod is provided so as to penetrate, the position of the void is fixed securely, and there is no possibility that the void will fall off from the fixing material even when the concrete is poured. In addition, since the voids are made of foamed plastic, there is no need to close the ends of the voids, which saves time and effort, is inexpensive, has a small weight, and has a high degree of freedom in shape. is there. Further, since the reinforcing bar is provided in the void, the void can be reinforced. Therefore, the fixed span or the support span of the void can be increased, and the number of fixing members or support bars used does not increase, and the number of steps required for mounting the fixing members or the support bars can be reduced.
[0083]
According to the third aspect of the present invention, since the reinforcing member is disposed at the upper end of the outer periphery of the void and the reinforcing member is locked to the fixing member, the movement of the void in the longitudinal direction can be prevented.
[0084]
According to the fourth aspect of the present invention, since the reinforcing member is provided so as to extend over both of the two adjacent rods, the connecting portion between the two adjacent rods can be reinforced and the two adjacent rods can be reinforced. Two rods can be fixed at the same time.
[0085]
According to the fifth, sixth, and fifteenth aspects of the present invention, the reinforcing tape is attached to at least the upper end of the outer periphery of the void in parallel with the longitudinal direction of the void, so that the void can be reinforced. . Therefore, the same effects as those of the first aspect can be obtained.
[0086]
According to the seventh and eighth aspects of the invention, the same effects as those of the first, second, and fourth aspects are obtained, and the fixing member extends over both adjacent two rods. Thus, the span is set obliquely to the longitudinal direction of the void, so that the fixed span of the void can be increased without reinforcing the void.
[0087]
According to the ninth and sixteenth aspects of the present invention, since the fixing member includes the two fitting portions, the void fixing portion, and the two support arms, the void can be fixed only by the fixing member, and the position of the void can be fixed more. In addition to being able to do it reliably, it can be easily attached to the reinforcing bar and fix the void. In addition, if the fixing member can be fixed to a reinforcing bar located on the upper part of the floor slab such as the upper reinforcing bar, the fixing member can be easily attached.
[0088]
According to the tenth, eleventh, and seventeenth aspects of the present invention, at least a concave portion or a convex portion provided on at least a part of the void fixing portion of the fixing member is brought into contact with the movement preventing portion. The positioning of the fixing member or the fixing member can be easily performed, the movement of the void in the longitudinal direction can be reliably prevented, and the position of the void can be reliably fixed. Further, since the void is made of foamed plastic, a movement preventing portion such as a movement preventing hole can be easily formed by in-mold foam molding or machining.
[0089]
According to the twelfth and eighteenth aspects of the present invention, since the fixing member includes the two fitting portions, the void pressing portion, and the two support arms, the position of the void can be reliably fixed, and the mounting to the reinforcing bar can be performed. The void can be fixed easily. In addition, if the fixing member can be fixed to a reinforcing bar located on the upper part of the floor slab such as the upper reinforcing bar, the fixing member can be easily attached.
[0090]
According to the thirteenth aspect, since the reinforcing member is provided in the void, the void can be reinforced. Therefore, the support span of the void by the support rod can be increased, the number of use of the support rod does not increase, and the man-hour required for mounting the support rod can be reduced. In addition, since the reinforcing material is locked to the support rod, the movement of the void in the longitudinal direction can be prevented. Other advantages are the same as those of the first aspect.
[0091]
According to the fourteenth and fifteenth aspects of the present invention, since the support rod is provided so as to penetrate the void, it is possible to prevent the void from moving in the longitudinal direction without locking the void with a number line or the like. it can.
[0092]
According to the nineteenth aspect of the invention, the same effect as that of the sixteenth aspect is obtained, and the bridge is installed obliquely with respect to the longitudinal direction of the void so as to extend over both of the two adjacent rods. As a result, the fixed span of the void can be increased without reinforcing the void.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional view of a main part showing a void fixing structure according to a first embodiment.
FIG. 2 is a partially omitted side sectional view of FIG. 1;
FIG. 3 is an enlarged schematic plan view of a main part showing a void and a lower reinforcing bar.
FIG. 4 is an enlarged schematic plan view of a main part showing the vicinity of a connecting portion of a rod.
FIG. 5 is a front view of FIG. 4;
FIG. 6 is a plan view of a rod.
FIG. 7 is an enlarged perspective view of a main part near one end or the other end of the rod.
FIG. 8 is an enlarged plan view of a main part showing how rods are connected to each other.
FIG. 9 is a front view of FIG. 8;
FIG. 10 is a sectional view showing a state where a reinforcing bar and a fixing member are attached to the void.
FIG. 11 is an enlarged schematic plan view of an essential part showing a void fixing structure according to a second embodiment.
FIG. 12 is an enlarged schematic plan view of a main part showing an example in which an X-shaped fixing member is used.
FIG. 13 is an enlarged sectional view of a main part showing a void fixing structure according to a third embodiment.
FIG. 14 is an enlarged sectional view of a main part showing a void fixing structure according to a fourth embodiment.
FIG. 15 is an enlarged front view of a main part in the vicinity of a movement prevention hole of a rod.
FIG. 16 is an enlarged sectional view of a main part showing an example in which a fixing material that can be fixed to the upper reinforcing bar is used.
FIG. 17 is an enlarged sectional view of a main part showing a void fixing structure according to a fifth embodiment.
FIG. 18 is an enlarged front view of a main part near a movement prevention hole of a rod.
FIG. 19 is an enlarged sectional view of a principal part showing a void fixing structure according to a sixth embodiment.
FIG. 20 is a plan view of a rod body in which a reinforcing tape is attached to the upper end of the outer periphery.
FIG. 21 is an enlarged sectional view of a main part showing a void fixing structure according to a seventh embodiment.
FIG. 22 is an enlarged sectional view of a main part showing a void fixing structure according to an eighth embodiment.
FIG. 23 is an enlarged schematic plan view of a main part showing the vicinity of a connecting portion of a rod.
FIG. 24 is a front view of FIG. 23;
FIG. 25 is an enlarged sectional view of a main part showing a void fixing structure according to a ninth embodiment;
FIG. 26 is an enlarged side sectional view of a main part showing the vicinity of a notch groove.
[Explanation of symbols]
1 void
2 Lower end rebar (rebar)
A space
3 fixing materials
4 Reinforcing bars (reinforcing materials)
5 rod
9 floor slab
15 Top rebar (rebar)
24 Fitting part
25 Void fixing part
25a Open end (convex)
26 Support arm
31, 32 fixing material
41 fixing material
51,53 fixing material
52 Movement prevention hole (movement prevention part)
61 Reinforcement tape
71 Support bar (support bar)
72 Fixing material
73 void holding part

Claims

At least two rebars arranged horizontally and spaced apart and parallel to one another for building floor slabs of the building;
A void formed in a rod shape from foamed plastic and disposed in a space between the at least two rebars in parallel with a longitudinal direction of the rebar;
A fixing member fixed to the at least two reinforcing bars and fitted with the voids;
A void fixing structure with
A void fixing structure, wherein a reinforcing material is disposed inside or on an outer periphery of the void in parallel with a longitudinal direction of the void.

At least two rebars arranged horizontally and spaced apart and parallel to one another for building floor slabs of the building;
A void formed in a rod shape from foamed plastic and disposed in a space between the at least two rebars in parallel with a longitudinal direction of the rebar;
A support rod disposed below the void at a right angle to the longitudinal direction of the void and having the void mounted thereon,
A fixing member fixed to the at least two rebars so as to press the void from above,
A void fixing structure with
A void fixing structure, wherein a reinforcing material is disposed inside or on an outer periphery of the void in parallel with a longitudinal direction of the void.

3. The void fixing structure according to claim 1, wherein the reinforcing member is disposed at an upper end of an outer periphery of the void, and the reinforcing member is locked to the fixing member.

The void according to any one of claims 1 to 3, wherein the void is formed by connecting a plurality of rods in a longitudinal direction, and the reinforcing member is disposed so as to span both adjacent two rods. Fixed structure.

At least two rebars arranged horizontally and spaced apart and parallel to one another for building floor slabs of the building;
A void formed in a rod shape from foamed plastic and disposed in a space between the at least two rebars in parallel with a longitudinal direction of the rebar;
A fixing member fixed to the at least two reinforcing bars and fitted with the voids;
A void fixing structure with
A void fixing structure, wherein a reinforcing tape is attached to at least an upper end of an outer periphery of the void in parallel with a longitudinal direction of the void.

At least two rebars arranged horizontally and spaced apart and parallel to one another for building floor slabs of the building;
A void formed in a rod shape from foamed plastic and disposed in a space between the at least two rebars in parallel with a longitudinal direction of the rebar;
A support rod disposed below the void at a right angle to the longitudinal direction of the void and having the void mounted thereon,
A fixing member fixed to the at least two rebars so as to press the void from above,
A void fixing structure with
A void fixing structure, wherein a reinforcing tape is attached to at least an upper end of an outer periphery of the void in parallel with a longitudinal direction of the void.

At least two rebars arranged horizontally and spaced apart and parallel to one another for building floor slabs of the building;
A void formed in a rod shape from foamed plastic and disposed in a space between the at least two rebars in parallel with a longitudinal direction of the rebar;
A fixing member fixed to the at least two reinforcing bars and fitted with the voids;
A void fixing structure with
The void is formed by connecting a plurality of rods in the longitudinal direction, and the fixing member is fixed in an oblique direction to the longitudinal direction of the voids so as to span both adjacent two rods. A void fixing structure characterized by the following.

At least two rebars arranged horizontally and spaced apart and parallel to one another for building floor slabs of the building;
A void formed in a rod shape from foamed plastic and disposed in a space between the at least two rebars in parallel with a longitudinal direction of the rebar;
A support rod disposed below the void at a right angle to the longitudinal direction of the void and having the void mounted thereon,
A fixing member fixed to the at least two rebars so as to press the void from above,
A void fixing structure with
The void is formed by connecting a plurality of rods in the longitudinal direction, and the fixing member is fixed in an oblique direction to the longitudinal direction of the voids so as to span both adjacent two rods. A void fixing structure characterized by the following.

The fixing material,
At least two fitting portions respectively fitted to the respective reinforcing bars,
A void fixing portion into which the void is fitted,
At least two support arms respectively connecting each fitting portion and the void fixing portion,
The void fixing structure according to claim 1, 5 or 7, comprising:

The void fixing structure according to claim 9, wherein at least a concave portion or a convex portion provided at a part of the void fixing portion abuts on a movement preventing portion formed on a side portion of an outer periphery of the void.

At least two rebars arranged horizontally and spaced apart and parallel to one another for building floor slabs of the building;
A void formed in a rod shape from foamed plastic and disposed in a space between the at least two rebars in parallel with a longitudinal direction of the rebar;
A fixing member fixed to the at least two reinforcing bars and fitted with the voids;
A void fixing structure with
At least two fitting portions each of which the fixing member is fitted to each rebar, a void fixing portion to which the void is fitted, and at least two fitting portions respectively connecting the fitting portions and the void fixing portions. Consisting of a support arm,
A void fixing structure, wherein a concave portion or a convex portion provided at least in a part of the void fixing portion is brought into contact with a movement preventing portion formed on a side portion of an outer periphery of the void.

The fixing material,
At least two fitting portions respectively fitted to the respective reinforcing bars,
A void holding portion for holding the void from above,
At least two support arms respectively connecting each fitting portion and the void holding portion,
The void fixing structure according to claim 2, 6 or 8, comprising:

Support rods buried horizontally in the floor slab of the building,
A void formed in a rod shape from foamed plastic and hung horizontally on the support rod and perpendicular to the longitudinal direction of the support rod,
A void fixing structure with
A void fixing structure, wherein a reinforcing material is provided at an upper end of an outer periphery of the void in parallel with a longitudinal direction of the void, and the reinforcing material is locked to the support rod.

A void formed in a rod shape from foamed plastic and buried horizontally in the floor slab of the building;
A support rod disposed horizontally and through the void at right angles to the longitudinal direction of the void,
A void fixing structure with
A void fixing structure, wherein a reinforcing material is disposed inside or on an outer periphery of the void in parallel with a longitudinal direction of the void.

A void formed in a rod shape from foamed plastic and buried horizontally in the floor slab of the building;
A support rod disposed horizontally and through the void at right angles to the longitudinal direction of the void,
A void fixing structure with
A void fixing structure, wherein a reinforcing tape is attached to at least an upper end of an outer periphery of the void in parallel with a longitudinal direction of the void.

To fix a long void parallel to the longitudinal direction of the rebar in the space between at least two rebars arranged horizontally and spaced apart and parallel to each other for constructing the floor slab of the building A void fixing material,
At least two fitting portions respectively fitted to the respective reinforcing bars,
A void fixing portion into which the void is fitted,
At least two support arms respectively connecting each fitting portion and the void fixing portion,
A void fixing material, comprising:

17. The void fixing material according to claim 16, wherein a concave portion or a convex portion provided at least in a part of the void fixing portion is brought into contact with a movement preventing portion formed on a side portion of an outer periphery of the void. .

To fix a long void parallel to the longitudinal direction of the rebar in the space between at least two rebars arranged horizontally and spaced apart and parallel to each other for constructing the floor slab of the building A void fixing material,
At least two fitting portions respectively fitted to the respective reinforcing bars,
A void holding portion for holding the void from above,
At least two support arms respectively connecting each fitting portion and the void holding portion,
A void fixing material, comprising:

The void fixing material according to any one of claims 16 to 18, wherein the fixing material is fixed to the at least two reinforcing bars obliquely to a longitudinal direction of the void.