JP2004150120A

JP2004150120A - Expansion joint for road bridge and manufacturing method for expansion joint for road bridge

Info

Publication number: JP2004150120A
Application number: JP2002316305A
Authority: JP
Inventors: Motonosuke Arai; 元之助新井; Yoshimasa Arai; 良昌新井
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-10-30
Filing date: 2002-10-30
Publication date: 2004-05-27

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for an expansion joint when using an injection type foaming sealant superior in extensibility as a sealant in the expansion joint for a road bridge. <P>SOLUTION: Injection type foaming sponge 8 is prevented from flowing in a rail joint opening 5 by filling the injection type foaming sponge 8 between a pair of vertical plate parts 2 and 2 after filling a granular material 7 in the rail joint opening 5, and the injection type foaming sponge 8 can also be closely spread all over around ribs 4 and 4 so that waterproofness of the expansion joint 11 can be secured. A surface of the injection type foaming sponge 8 in contact with the granular material 7 can be almost flatly finished. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は道路橋用伸縮継手及び道路橋用伸縮継手の製造方法に関する。
【０００２】
【従来の技術】
道路橋用伸縮継手として、フィンガージョイントと呼ばれるものが知られている。これは、図１に示すように、相対向する縦板ａと、各縦板ａの上に溶接された片側櫛歯状の横板ｂとを備え、互いの櫛歯が遊間ｃを存して噛み合うように組み合わされている。各縦板ａには棚板ｄが固定されており、バックアップ材ｆと棚板ｄとを縦板ａに組み込んだ後、遊間ｃからシール材ｅを充填することにより上記道路橋用伸縮継手が形成されている。遊間ｃから落下する雨水はシール材ｅで受けられる。シール材ｅは雨水を橋軸長手方向に導く働きをする（非特許文献１参照）。
【０００３】
【非特許文献１】
”道路橋伸縮装置便覧（２版）” 社団法人日本道路協会、昭和４７年９月２０日、Ｐ．１２４−１３７
【０００４】
【発明が解決しようとする課題】
しかし、従来のフィンガージョイントでは、シール材ｅとして伸縮性の悪いゴムシール材を用いているため、縦板ａの間隔が広くなったときは、シール材ｅが伸縮を許容できずに、シール材ｅに亀裂が発生して伸縮継手の防水性や耐久性が悪くなり、また、縦板ａの間隔が狭くなったときは、シール材ｅが伸縮を許容できずに遊間ｃからシール材ｅが道路橋表面に飛び出してしまうという問題があった。
【０００５】
本発明者は、シール材ｅの材質を伸縮性の悪いゴムシール材から伸縮性に優れた注入式発泡シール材に変更することにより、縦板ａの間隔が拡大・縮小したときに、シール材ｅが伸縮を許容することによって、シール材ｅに亀裂が発生したり、シール材ｅが遊間ｃから道路橋表面に飛び出さないようにすることを考えたが、上記と同様の方法で遊間ｃから注入式発泡シール材を充填すると、発泡時にシール材ｅの高さがばらつくなど高さのコントロールが困難であり、発泡後のシール材ｅの表面が凹凸形状に仕上がってしまったり、遊間ｃから注入式発泡シール材がはみ出してしまう等の問題があったため、実用化ができていなかった。
【０００６】
【課題を解決するための手段】
本発明は、注入式発泡シール材を用いて縦板部間に充填する際に、道路橋用伸縮継手を、道路橋の路面となる面が下になるように倒置し、遊間に粒状物を充填してから注入式発泡シール材を注入して固化させ、上記粒状物と接している上記注入式発泡シール材の表面を略平坦に仕上げて上記道路橋用伸縮継手を製造することにより、上述の問題を解決する。
【０００７】
すなわち、請求項１に係る発明は、各々道路橋の継目長手方向に延びる縦板部を有し、該縦板部が互いに対向し、路面に開口する遊間を形成する一対の継手部材と、
上記一対の継手部材の相対向する縦板部間を塞ぐように設けられたシール部材とを備えた道路橋用伸縮継手の製造方法であって、
上記シール部材を形成するための注入式発泡シール材を上記縦板部間に注入する際に、該継手部材を、道路橋の路面となる面が下になるように倒置し、上記遊間に粒状物を所定高さになるように充填してから該注入式発泡シール材の注入を行うことにより、該粒状物と接している該注入式発泡シール材の表面を略平坦に仕上げることを特徴とする。
【０００８】
従って、上記粒状物によって上記遊間を塞いで上記注入式発泡シール材を充填したから、上記粒状物と接している上記注入式発泡シール材の表面を略平坦に仕上げることができる。また、該遊間の形状に合わせて該粒状物を充填することや、該注入式発泡シール材を充填した後に該粒状物を取り除くことは容易に行えるため、遊間の形状に適合した治具を製作して上記方法と同様の作業をする場合に比べて、作業時間を大幅に短縮することができる。
【０００９】
なお、上記継手部材は、縦板部の上端が路面を形成するものであっても、縦板部の上端に横板部（フェイスプレート）を備えたものであってもよい。
【００１０】
請求項２に係る発明は、各々道路橋の継目長手方向に延びる縦板部と、該縦板部の上端より横に張り出して、表面が路面と面一になるように設けられた横板部とを有し、該縦板部が互いに対向し、上記横板部が互いに相手側へ向かって突出し且つその先端間に遊間を形成する一対の継手部材と、
上記一対の継手部材の相対向する縦板部間を塞ぐように設けられたシール部材とを備えた道路橋用伸縮継手の製造方法であって、
上記シール部材を形成するための注入式発泡シール材を上記縦板部間に注入する際に、上記横板部の表面が下になるように該継手部材を倒置し、上記遊間に該横板部の裏面と略面一になるように粒状物を充填してから該注入式発泡シール材の注入を行うことにより、該注入式発泡シール材の該遊間への流入を防止し、
該粒状物と接している該注入式発泡シール材の表面を略平坦に仕上げることを特徴とする。
【００１１】
従って、上記粒状物によって上記遊間を塞いだから、上記注入式発泡シール材を充填する際に、該遊間に該注入式発泡シール材が流入することなしに該注入式発泡シール材を上記横板部の裏面全体に行き渡らせることができ、上記伸縮継手の防水性を確保することができると共に、該粒状物と接している該注入式発泡シール材の表面を略平坦に仕上げることができる。
【００１２】
請求項３に係る発明は、各々道路橋の継目長手方向に延びる縦板部と、該縦板部の上端より横に張り出して、表面が路面と面一になるように設けられた横板部とを有し、該縦板部が互いに対向し、上記横板部が互いに相手側へ向かって突出し且つその先端間に遊間を形成する一対の継手部材と、
上記一対の継手部材の相対向する縦板部間を塞ぐように設けられたシール部材とを備えた道路橋用伸縮継手の製造方法であって、
上記シール部材を形成するための注入式発泡シール材を上記縦板部間に注入する際に、上記横板部の表面が下になるように該継手部材を倒置し、上記遊間に粒状物を充填すると共に、上記縦板部間に上記横板部の裏面から所定高さになるように上記粒状物を充填してから該注入式発泡シール材の注入を行うことにより、該注入式発泡シール材の該遊間への流入を防止し、
該粒状物と接している該注入式発泡シール材の表面を略平坦に仕上げることを特徴とする。
【００１３】
従って、請求項２と同様の効果が得られると共に、注入式発泡シール材が固化した後粒状物を取り除くと、横板部と注入式発泡シール材の間に隙間ができるため、この隙間にコーティング剤等を塗布することにより、表面の保護や強化を図ることができる。さらに、注入式発泡シール材の外観を化粧して商品価値を高めることができる。
【００１４】
請求項４に係る発明は、各々道路橋の継目長手方向に延びる縦板部を有し、該縦板部が互いに対向し、路面に開口する遊間を形成する一対の継手部材と、
上記一対の継手部材の相対向する縦板部間を塞ぐように設けられたシール部材とを備えた道路橋用伸縮継手であって、
上記シール部材は、上記縦板部間に注入された注入式発泡シール材によって形成され、発泡による独立気泡を有し、
上記シール部材の伸縮特性は、引張り応力１．０ＭＰａ以下で伸び率が５０％以上であることを特徴とする。
【００１５】
従って、上記シール部材は、発泡による独立気泡を有しているから、止水性に優れたシール部材となり、伸縮継手の防水性を高めることができる。また、上記注入式発泡シール材は、引張り性に優れた材料を用いているから、道路橋の遊間が拡大したときに、シール部材が伸縮を許容することによって、上記シール部材に亀裂が入ることを防止でき、伸縮継手の防水性や耐久性を向上させることができる。
【００１６】
なお、上記継手部材は、縦板部の上端が路面を形成するものであっても、縦板部の上端に横板部（フェイスプレート）を備えたものであってもよい。
【００１７】
請求項５に係る発明は、請求項４に記載された道路橋用伸縮継手において、
上記シール部材の伸縮特性は、圧縮応力１．０ＭＰａ以下で圧縮率が５０％以上であることを特徴とする。
【００１８】
従って、上記注入式発泡シール材は、圧縮性に優れた材料を用いているから、道路橋の遊間が縮小したときに、シール部材が伸縮を許容することによって、上記シール部材が盛り上がって遊間から道路橋表面に飛び出すことを防止できる。
【００１９】
【発明の効果】
以上のように、本発明の製造方法によれば、上記粒状物によって上記遊間を塞いだから、上記注入式発泡シール材を充填する際に、該遊間に該注入式発泡シール材が流入することを防止できると共に、該粒状物と接している該注入式発泡シール材の表面を略平坦に仕上げることができる。
【００２０】
また、本発明の伸縮継手によれば、引張り応力１．０ＭＰａ以下で伸び率が５０％以上の伸縮特性を有する該注入式発泡シール材をシール部材として用いているから、道路橋の遊間が拡大したときに、シール部材が伸縮を許容することによって、上記シール部材に亀裂が入ることを防止できるため、伸縮継手の防水性や耐久性を向上させることができる。
【００２１】
また、圧縮応力１．０ＭＰａ以下で圧縮率が５０％以上の伸縮特性を有する該注入式発泡シール材をシール部材として用いた場合には、道路橋の遊間が縮小したときに、シール部材が伸縮を許容することによって、上記シール部材が盛り上がって遊間から道路橋表面に飛び出すことを防止できる。
【００２２】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
【００２３】
＜実施形態１＞
図２−（ａ）〜（ｄ）には、本実施形態１における伸縮継手の構造及びその製造方法が示されている。
【００２４】
図２−（ａ）において、１１は本実施形態１における伸縮継手である。１，１は一対の継手部材である。継手部材１，１は、奥行方向に延びる縦板部２，２と、縦板部２，２の上端より両側に張り出した横板部３，３と、縦板部２，２の側面から張り出し、横板部３，３の下面と係合しているリブ４，４とを有している。横板部３は、図３に示すように、内側張り出し部３ａと外側張り出し部３ｂの先端が櫛歯状に出入りした凹凸形状に形成されている。両継手部材１，１は、互いの縦板部２，２が対向するように設けられている。両継手部材１，１の互いに相手側へ突出した内側張り出し部３ａ，３ａは、その先端間に波形の遊間５を形成するように組み合わされている。
【００２５】
継手部材１，１の縦板部２，２間には、注入式発泡スポンジ８が充填されている。そして、注入式発泡スポンジ８を下から支持するために、バックアップ材９が縦板部２，２間にはめ込まれており、さらにバックアップ材９の下から断面Ｌ型の受けアングル１０，１０が縦板部２，２の内側側面に係合して固定されている。
【００２６】
以下に、本実施形態１における伸縮継手１１の製造方法を示す。
【００２７】
図２−（ｂ）において、６は本作業を行う時に継手部材１，１の下に敷いておく合板である。継手部材１，１は、横板部３，３の表面が下になるように合板６の上に置かれている。遊間５には粒状物７を横板部３，３の上面と略面一になるように隙間なく充填する。ここで、粒状物７は、砂、鉱滓、鋳物用の砂などを用いることが好ましい。
【００２８】
次に、図２−（ｃ）に示すように、継手部材１，１の縦板部間に注入式発泡スポンジ（注入式発泡シール材）８を充填する。注入式発泡スポンジ８は、固化すると液状時の約３倍の体積となるため、充填する注入式発泡スポンジ８の量は固化後の厚さを考慮して行う必要がある。固化後の注入式発泡スポンジ８の厚さは、リブ４，４の高さよりも厚くなるように調節されている。また、注入式発泡スポンジ８を充填する前に、縦板部２，２の内側側面に接着剤を塗布しておくことが好ましい。
【００２９】
図４−（ａ），（ｂ）に注入式発泡スポンジ８を発泡させた後の伸縮特性を示す。図４−（ａ），（ｂ）に示すように、注入式発泡スポンジ８には、引張り応力１．０ＭＰａ以下で伸び率が５０％以上、圧縮応力１．０ＭＰａ以下で圧縮率が５０％以上の伸縮特性を有する材料を使用する。例えば本実施形態では、発泡シリコーンフォーム（商品名：トスフォーム３００、ＧＥ東芝シリコーン株式会社製）を用いた。これは、以下の実施形態においても同様である。
【００３０】
次に、注入式発泡スポンジ８の発泡完了後に、図２−（ｄ）に示すように、バックアップ材９を縦板部間にはめ込んで、その上から断面Ｌ型の受けアングル１０，１０を縦板部２，２の内側側面に係合して固定する。そして、合板６と粒状物７を取り除く。
【００３１】
次に、継手部材１全体を天地逆にして戻すことにより、図２−（ａ）に示すような、シール材として注入式発泡スポンジ８を用いた本実施形態１における伸縮継手１１が完成する。
【００３２】
従って、上述の伸縮継手の製造方法によれば、遊間５に粒状物７を充填して遊間５を塞ぎ、シール材の流入を防止するようにしたから、縦板部間を塞ぐシール材として、注入式発泡スポンジ８を用いることが可能となった。これによって、リブ４，４の周囲にも隙間なく注入式発泡スポンジ８を行き渡らせることができ、伸縮継手１１の防水性を確保することができると共に、該粒状物７と接している該注入式発泡スポンジ８の表面を略平坦に仕上げることができる。
【００３３】
また、遊間５を塞ぐ手段が、コストの非常に安く扱いやすい粒状物７（砂、鉱滓、鋳物用の砂）であるため、伸縮継手１１の製作費の削減になる。また、遊間５に粒状物７を充填することや、注入式発泡スポンジ８を充填した後に粒状物７を取り除くことが容易に実施でき、作業時間の短縮にもつながる。
【００３４】
また、本発明の伸縮継手の製作方法は、リブ４，４の設けられた伸縮継手にのみ適用が限定されるものではなく、縦板間の遊間を有するその他の道路橋用伸縮継手（例えば横板部が設けられていない道路橋用伸縮継手等）に対しても適用可能である。この点は、以下の実施形態においても同様である。
【００３５】
また、本実施形態において、注入式発泡スポンジ８の発泡完了後にバックアップ材９を縦板部間にはめ込んでいるが、バックアップ材９をはめ込まずに注入式発泡スポンジ８の上から受けアングル１０を係合させてもよい。この点は、以下の実施形態においても同様である。
【００３６】
＜実施形態２＞
図５−（ａ）〜（ｄ）には、本実施形態２における伸縮継手の構造及びその製造方法が示されている。
【００３７】
図５−（ａ）において、１３は本実施形態１における伸縮継手である。実施形態１との相違点は、図５−（ａ）に示すように、横板部３，３と注入式発泡スポンジ８との間に隙間１２が設けられているところである。
【００３８】
以下に、本実施形態２における伸縮継手１３の製造方法を示す。
【００３９】
図５−（ｂ）において、６は本作業を行う時に継手部材１，１の下に敷いておく合板である。継手部材１，１は、横板部３，３の表面が下になるように合板６の上に置かれている。遊間５に粒状物７を充填すると共に、縦板部２，２間にも、横板部３，３の裏面から所定高さになるように粒状物７を隙間なく充填する。ここで、粒状物７は、砂、鉱滓、鋳物用の砂などを用いることが好ましい。
【００４０】
次に、図５−（ｃ）に示すように、継手部材１，１の縦板部間に注入式発泡スポンジ（注入式発泡シール材）８を充填する。注入式発泡スポンジ８は、固化すると液状時の約３倍の体積となるため、充填時は固化後の厚さを考慮して行う必要がある。固化後の注入式発泡スポンジ８の厚さは、リブ４，４の高さよりも厚くなるように調節されている。また、注入式発泡スポンジ８を充填する前に、縦板部２，２の内側側面に接着剤を塗布しておくことが好ましい。
【００４１】
次に、注入式発泡スポンジ８の発泡完了後に、図５−（ｄ）に示すように、バックアップ材９をはめ込んで、その上から断面Ｌ型の受けアングル１０，１０を縦板部２，２の内側側面に係合して固定する。そして、合板６と粒状物７を取り除くことにより、横板部３，３と注入式発泡スポンジ８との間に隙間１２を設ける。
【００４２】
次に、継手部材１全体を天地逆にして戻すことにより、図５−（ａ）に示すような、シール材として注入式発泡スポンジ８を用いた本実施形態２における伸縮継手１３が完成する。
【００４３】
従って、上述の伸縮継手の製造方法によれば、実施形態１と同様の防水性や作業性、注入式発泡スポンジ８の表面の平坦な仕上がり等を確保できる。また、横板部３，３と注入式発泡スポンジ８との間に隙間１２が設けられているから、隙間１２にコーティング剤等を塗布することにより、表面の保護や強化を図ることができる。また、注入式発泡スポンジ８の外観を化粧して商品価値を高めることができる。
【００４４】
＜実施形態３＞
図６−（ａ）〜（ｄ）には、本実施形態３における伸縮継手の構造及びその製造方法が示されている。
【００４５】
図６−（ａ）において、２０は本実施形態３における伸縮継手である。１５，１５は一対の継手部材である。図７に示すように、継手部材１５，１５は板面を垂直にして組み合わせた一対の波板で形成されており、道路橋の継目長手方向にジグザグになって延びる波形の遊間１６が形成されるように組み合わされている。継手部材１５，１５の内側側面には、互いに相手側に向かって突出し且つオーバーラップしたバックアップ板１７，１７が、継目長手方向に間隔をおいて複数固着されている。また、継手部材１５，１５の外側側面には、複数の鉄筋１８が外側に向かって突出して延びている。
【００４６】
継手部材１５，１５間には、注入式発泡スポンジ８が充填されている。注入式発泡スポンジ８は、バックアップ板１７，１７によって支持されている。
【００４７】
以下に、本実施形態３における伸縮継手２０の製造方法を示す。
【００４８】
図６−（ｂ）において、６は本作業を行う時に継手部材１５，１５の下に敷いておく合板である。継手部材１５，１５は、路面となる面を下にして合板６の上に置かれている。遊間１６には粒状物７を所定厚さになるように隙間なく充填する。ここで、粒状物は、砂、鉱滓、鋳物用の砂などを用いることが好ましい。
【００４９】
次に、図６−（ｃ）に示すように、継手部材１５，１５の遊間１６に注入式発泡スポンジ（注入式発泡シール材）８を充填する。注入式発泡スポンジ８は、固化すると液状時の約３倍の体積となるため、充填する注入式発泡スポンジ８の量は固化後の厚さを考慮して行う必要がある。固化後の注入式発泡スポンジ８の厚さは、継手部材１５，１５の内側側面より張り出した２つのバックアップ板１７、１７のうち下側のバックアップ板１７の下面と同等かそれよりも低くなるように調節されている。また、注入式発泡スポンジ８を充填する前に、継手部材１５，１５の内側側面に接着剤を塗布しておくことが好ましい。
【００５０】
次に、注入式発泡スポンジ８の発泡完了後に、図６−（ｄ）に示すように、合板６と粒状物７を取り除く。
【００５１】
次に、継手部材１全体を天地逆にして戻すことにより、図６−（ａ）に示すような、シール材として注入式発泡スポンジ８を用いた本実施形態３における伸縮継手２０が完成する。
【００５２】
従って、上述の伸縮継手の製造方法によれば、実施形態１と同様の防水性や作業性、注入式発泡スポンジ８の表面の平坦な仕上がり等を確保できる。
【図面の簡単な説明】
【図１】
従来の伸縮継手を示す一部断面にした斜視図。
【図２】
（ａ）本発明の実施形態１に係る伸縮継手を示す断面図。
（ｂ）本発明の実施形態１に係る継手部材の遊間に粒状物を充填した状態を示す断面図。
（ｃ）本発明の実施形態１に係る継手部材に注入式発泡スポンジを充填した状態を示す断面図。
（ｄ）本発明の実施形態１に係る継手部材の遊間の粒状物を除去した状態を示す断面図。
【図３】
本発明の実施形態１に係る伸縮継手を示す平面図。
【図４】
（ａ）本発明に使用する注入式発泡スポンジに加える応力と材料の伸び率との関係を示すグラフ。
（ｂ）本発明に使用する注入式発泡スポンジに加える応力と材料の圧縮率との関係を示すグラフ。
【図５】
（ａ）本発明の実施形態２に係る伸縮継手を示す断面図。
（ｂ）本発明の実施形態２に係る継手部材の遊間に粒状物を充填した状態を示す断面図。
（ｃ）本発明の実施形態２に係る継手部材に注入式発泡スポンジを充填した状態を示す断面図。
（ｄ）本発明の実施形態２に係る継手部材の遊間の粒状物を除去した状態を示す断面図。
【図６】
（ａ）本発明の実施形態３に係る伸縮継手を示す断面図。
（ｂ）本発明の実施形態３に係る継手部材の遊間に粒状物を充填した状態を示す断面図。
（ｃ）本発明の実施形態３に係る継手部材に注入式発泡スポンジを充填した状態を示す断面図。
（ｄ）本発明の実施形態３に係る継手部材の遊間の粒状物を除去した状態を示す断面図。
【図７】
本発明の実施形態３に係る伸縮継手を示す平面図。
【符号の説明】
１継手部材
２縦板部
３横板部
３ａ内側張り出し部
３ｂ外側張り出し部
４リブ
５遊間
６合板
７粒状物
８注入式発泡スポンジ
９バックアップ材
１０受けアングル
１１伸縮継手
１２隙間
１３伸縮継手
１５継手部材
１６遊間
１７バックアップ板
１８鉄筋
２０伸縮継手[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a road bridge expansion joint and a method for manufacturing a road bridge expansion joint.
[0002]
[Prior art]
A so-called finger joint is known as an expansion joint for a road bridge. As shown in FIG. 1, this is provided with opposing vertical plates a and one-sided comb-shaped horizontal plates b welded on the respective vertical plates a, and each comb tooth has a play c. They are combined to engage. A shelf plate d is fixed to each vertical plate a. After the backup material f and the shelf plate d are assembled into the vertical plate a, the sealing material e is filled from the play space c to form the road bridge expansion joint. Is formed. Rainwater falling from the play space c is received by the sealing material e. The sealing material e functions to guide rainwater in the longitudinal direction of the bridge axis (see Non-Patent Document 1).
[0003]
[Non-patent document 1]
"Handbook of Road Bridge Extension Device (2nd Edition)" Japan Road Association, September 20, 1972, 124-137
[0004]
[Problems to be solved by the invention]
However, in the conventional finger joint, a rubber seal material having poor elasticity is used as the seal material e. Therefore, when the interval between the vertical plates a is widened, the seal material e cannot allow expansion and contraction, and When the cracks occur and the waterproofness and durability of the expansion joint deteriorate, and the interval between the vertical plates a becomes narrow, the sealing material e cannot permit expansion and contraction and the sealing material e There was a problem of jumping out to the bridge surface.
[0005]
The inventor of the present invention changed the material of the sealing material e from a rubber sealing material having poor elasticity to an injection-type foam sealing material having excellent elasticity. Allowed the expansion and contraction of the seal material e to prevent cracks and prevent the seal material e from protruding from the play space c to the surface of the road bridge, but from the play space c in the same manner as described above. When the injection type foam sealing material is filled, it is difficult to control the height, for example, the height of the sealing material e varies at the time of foaming, and the surface of the sealing material e after foaming is finished in an uneven shape, or injected from the gap c. Since there was a problem that the foam sealing material protruded, it could not be put to practical use.
[0006]
[Means for Solving the Problems]
The present invention, when filling between the vertical plate portion using the injection type foam sealing material, the road bridge expansion joint is inverted so that the road surface of the road bridge is down, and the granular material during play After filling, the injection type foam sealing material is injected and solidified, and the surface of the injection type foam sealing material that is in contact with the granular material is made substantially flat to produce the road bridge expansion joint. Solve the problem.
[0007]
That is, the invention according to claim 1 includes a pair of joint members each having a vertical plate portion extending in the longitudinal direction of the seam of the road bridge, the vertical plate portions facing each other and forming a play opening on the road surface,
A method for manufacturing an expansion joint for a road bridge, comprising: a sealing member provided so as to close between opposed vertical plate portions of the pair of joint members,
When injecting the injection-type foam sealing material for forming the seal member between the vertical plate portions, the joint member is inverted so that the road surface of the road bridge faces down, and the granular material is granulated during the play. By filling the material so as to have a predetermined height and then injecting the injection-type foam sealing material, the surface of the injection-type foam sealing material that is in contact with the granular material is finished to be substantially flat. I do.
[0008]
Therefore, the gap is closed by the granular material and the injection-type foam sealing material is filled, so that the surface of the injection-type foam sealing material that is in contact with the granular material can be finished substantially flat. In addition, since it is easy to fill the granules according to the shape of the play and to remove the granules after filling the injection type foam sealing material, a jig adapted to the shape of the play is manufactured. Then, the operation time can be greatly reduced as compared with the case where the same operation as the above method is performed.
[0009]
In addition, the joint member may be one in which the upper end of the vertical plate part forms a road surface or one in which a horizontal plate part (face plate) is provided at the upper end of the vertical plate part.
[0010]
The invention according to claim 2 is directed to a vertical plate portion extending in the longitudinal direction of the joint of the road bridge, and a horizontal plate portion extending laterally from an upper end of the vertical plate portion so as to be flush with the road surface. A pair of joint members, wherein the vertical plate portions face each other, and the horizontal plate portions protrude toward each other and form a play between the distal ends thereof.
A method for manufacturing an expansion joint for a road bridge, comprising: a sealing member provided so as to close between opposed vertical plate portions of the pair of joint members,
When injecting the injection-type foam sealing material for forming the sealing member between the vertical plate portions, the joint member is inverted so that the surface of the horizontal plate portion faces down, and the horizontal plate is placed in the play space. By injecting the injection-type foam sealing material after filling the granular material so as to be substantially flush with the back surface of the part, it is possible to prevent the injection-type foam sealing material from flowing into the gap,
The surface of the injection-type foam sealing material that is in contact with the granular material is finished to be substantially flat.
[0011]
Therefore, since the play space is closed by the granular material, when filling the injection-type foam sealing material, the injection-type foam sealing material flows into the horizontal plate portion without flowing into the injection-type foam sealing material during the play. Of the expansion joint, the waterproofness of the expansion joint can be ensured, and the surface of the injection-type foam sealing material that is in contact with the granular material can be made substantially flat.
[0012]
The invention according to claim 3 is a vertical plate portion extending in the longitudinal direction of the seam of the road bridge, and a horizontal plate portion provided so as to project laterally from an upper end of the vertical plate portion and to be flush with the road surface. A pair of joint members, wherein the vertical plate portions face each other, and the horizontal plate portions protrude toward each other and form a play between the distal ends thereof.
A method for manufacturing an expansion joint for a road bridge, comprising: a sealing member provided so as to close between opposed vertical plate portions of the pair of joint members,
When injecting the injection-type foam sealing material for forming the seal member between the vertical plate portions, the joint member is inverted so that the surface of the horizontal plate portion faces down, and the granular material is removed during the play. Filling and filling the granular material between the vertical plate portions so as to have a predetermined height from the back surface of the horizontal plate portion, and then injecting the injection-type foam sealing material, thereby forming the injection-type foam seal. Prevent the material from flowing into the play space,
The surface of the injection-type foam sealing material that is in contact with the granular material is finished to be substantially flat.
[0013]
Therefore, the same effect as in claim 2 can be obtained, and when the injection-type foam sealing material is solidified and the particulate matter is removed, a gap is formed between the horizontal plate portion and the injection-type foam sealing material. By applying an agent or the like, the surface can be protected or strengthened. Further, the appearance of the injection-type foam sealing material can be decorated to enhance the commercial value.
[0014]
The invention according to claim 4 has a pair of joint members each having a vertical plate portion extending in the longitudinal direction of the seam of the road bridge, the vertical plate portions facing each other and forming a play opening on the road surface,
An expansion joint for a road bridge, comprising: a sealing member provided so as to close between opposed vertical plate portions of the pair of joint members,
The seal member is formed by an injection-type foam sealing material injected between the vertical plate portions, and has closed cells due to foaming,
The expansion and contraction characteristics of the seal member are characterized by a tensile stress of 1.0 MPa or less and an elongation of 50% or more.
[0015]
Therefore, since the above-mentioned seal member has closed cells by foaming, it becomes a seal member excellent in water stoppage, and the waterproofness of the expansion joint can be enhanced. In addition, since the injection type foam sealing material uses a material having excellent tensile properties, when the play space of the road bridge is expanded, the sealing member is allowed to expand and contract, so that the sealing member is cracked. Can be prevented, and the waterproofness and durability of the expansion joint can be improved.
[0016]
In addition, the joint member may be one in which the upper end of the vertical plate part forms a road surface or one in which a horizontal plate part (face plate) is provided at the upper end of the vertical plate part.
[0017]
The invention according to claim 5 is the road bridge expansion joint according to claim 4,
The expansion and contraction characteristics of the seal member are characterized in that the compression stress is 1.0 MPa or less and the compression ratio is 50% or more.
[0018]
Therefore, since the injection type foam sealing material uses a material having excellent compressibility, when the play space of the road bridge is reduced, the seal member is allowed to expand and contract, so that the seal member rises and the play space is reduced from the play space. It can be prevented from jumping out onto the road bridge surface.
[0019]
【The invention's effect】
As described above, according to the manufacturing method of the present invention, since the play is closed by the granular material, when filling the injection-type foam sealing material, the injection-type foam sealing material flows during the play. In addition, the surface of the injection-type foam sealing material that is in contact with the granular material can be made substantially flat.
[0020]
In addition, according to the expansion joint of the present invention, since the injection-type foamed sealing material having a stretching property of not more than 50% and a tensile stress of not more than 1.0 MPa is used as a sealing member, the play space of the road bridge is expanded. In this case, since the seal member allows the expansion and contraction to prevent the seal member from being cracked, the waterproofness and durability of the expansion joint can be improved.
[0021]
Further, when the injection-type foamed sealing material having a compressive stress of 1.0 MPa or less and a compressibility of 50% or more is used as a sealing member, the sealing member expands and contracts when the gap of the road bridge is reduced. Is allowed, it is possible to prevent the seal member from rising and jumping out of the play space onto the surface of the road bridge.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
<First embodiment>
FIGS. 2A to 2D show a structure of an expansion joint according to the first embodiment and a manufacturing method thereof.
[0024]
In FIG. 2A, reference numeral 11 denotes an expansion joint according to the first embodiment. 1, 1 are a pair of joint members. The joint members 1, 1 extend from the vertical plate portions 2, 2 extending in the depth direction, the horizontal plate portions 3, 3 projecting from both ends from the upper ends of the vertical plate portions 2, 2, and the side surfaces of the vertical plate portions 2, 2. And ribs 4 and 4 engaged with the lower surfaces of the horizontal plate portions 3 and 3, respectively. As shown in FIG. 3, the horizontal plate portion 3 is formed in an uneven shape in which the tips of the inner protruding portion 3a and the outer protruding portion 3b enter and exit in a comb shape. Both joint members 1, 1 are provided such that the vertical plate portions 2, 2 face each other. The inner projections 3a, 3a of the two joint members 1, 1 projecting toward each other are combined so as to form a corrugated play 5 between the tips.
[0025]
The space between the vertical plates 2 and 2 of the joint members 1 and 1 is filled with an injection type foamed sponge 8. In order to support the injection-type foamed sponge 8 from below, a backup material 9 is fitted between the vertical plate portions 2, and further, from below the backup material 9, receiving angles 10, 10 having an L-shaped cross section are vertically arranged. It is engaged with and fixed to the inner side surfaces of the plate portions 2 and 2.
[0026]
Hereinafter, a method for manufacturing the expansion joint 11 according to the first embodiment will be described.
[0027]
In FIG. 2B, reference numeral 6 denotes a plywood laid under the joint members 1 and 1 when performing the main work. The joint members 1, 1 are placed on the plywood 6 such that the surfaces of the horizontal plate portions 3, 3 face down. The idle space 5 is filled with the granular material 7 without any gap so as to be substantially flush with the upper surfaces of the horizontal plate portions 3. Here, as the granular material 7, it is preferable to use sand, slag, sand for casting, and the like.
[0028]
Next, as shown in FIG. 2C, an injectable foam sponge (injectable foam sealing material) 8 is filled between the vertical plate portions of the joint members 1 and 1. When the injection-type foamed sponge 8 is solidified, the volume becomes about three times that of the liquid state. Therefore, the amount of the injection-type foamed sponge 8 to be filled must be determined in consideration of the thickness after solidification. The thickness of the injection-type foamed sponge 8 after solidification is adjusted to be greater than the height of the ribs 4 and 4. Before filling the injection type foam sponge 8, it is preferable to apply an adhesive to the inner side surfaces of the vertical plate portions 2 and 2.
[0029]
FIGS. 4- (a) and (b) show the expansion and contraction characteristics after the injection type foamed sponge 8 is foamed. As shown in FIGS. 4- (a) and (b), the injection type foamed sponge 8 has an elongation of 50% or more at a tensile stress of 1.0 MPa or less, and a compressibility of 50% or more at a compressive stress of 1.0 MPa or less. Use a material having the following elastic properties. For example, in this embodiment, a foamed silicone foam (trade name: Tosfoam 300, manufactured by GE Toshiba Silicone Co., Ltd.) was used. This is the same in the following embodiments.
[0030]
Next, after the foaming of the injection type foam sponge 8 is completed, as shown in FIG. 2D, the backup material 9 is fitted between the vertical plate portions, and the receiving angles 10, 10 having an L-shaped cross section are vertically positioned from above. Engage and fix to the inner side surfaces of the plate portions 2 and 2. Then, the plywood 6 and the granular material 7 are removed.
[0031]
Next, the entire joint member 1 is turned upside down and returned, thereby completing the expansion joint 11 according to the first embodiment using the injection type foamed sponge 8 as a seal material as shown in FIG.
[0032]
Therefore, according to the above-described method of manufacturing the expansion joint, the gaps 5 are filled with the granular material 7 to close the gaps 5 and prevent the inflow of the sealing material. It became possible to use the injection type foam sponge 8. As a result, the injection type foam sponge 8 can be spread around the ribs 4 and 4 without any gap, and the waterproofness of the expansion joint 11 can be ensured, and the injection type sponge 8 in contact with the granular material 7 can be ensured. The surface of the foamed sponge 8 can be finished almost flat.
[0033]
Further, since the means for closing the play space 5 is the very cheap and easy-to-handle granular material 7 (sand, slag, sand for casting), the production cost of the expansion joint 11 can be reduced. In addition, it is possible to easily fill the play space 5 with the granular material 7 and to remove the granular material 7 after filling the injection type foamed sponge 8, which leads to a reduction in work time.
[0034]
Further, the method of manufacturing the expansion joint of the present invention is not limited to the expansion joint provided with the ribs 4 and 4, but may be applied to other expansion joints for road bridges having a clearance between vertical plates (for example, a horizontal joint). The present invention can also be applied to a road bridge expansion joint having no plate portion. This is the same in the following embodiments.
[0035]
Further, in the present embodiment, the backup material 9 is fitted between the vertical plate portions after the foaming of the injection type foam sponge 8 is completed, but the receiving angle 10 is engaged from above the injection type foam sponge 8 without fitting the backup material 9. They may be combined. This is the same in the following embodiments.
[0036]
<Embodiment 2>
FIGS. 5A to 5D show a structure of an expansion joint according to the second embodiment and a manufacturing method thereof.
[0037]
In FIG. 5A, reference numeral 13 denotes an expansion joint according to the first embodiment. The difference from the first embodiment is that a gap 12 is provided between the horizontal plate portions 3 and 3 and the injection type foamed sponge 8 as shown in FIG.
[0038]
Hereinafter, a method for manufacturing the expansion joint 13 according to the second embodiment will be described.
[0039]
In FIG. 5B, reference numeral 6 denotes a plywood to be laid under the joint members 1 and 1 when performing this operation. The joint members 1, 1 are placed on the plywood 6 such that the surfaces of the horizontal plate portions 3, 3 face down. The idle space 5 is filled with the granular material 7, and the granular material 7 is also filled between the vertical plate portions 2 and 2 so that the granular material 7 has a predetermined height from the back surface of the horizontal plate portions 3. Here, as the granular material 7, it is preferable to use sand, slag, sand for casting, and the like.
[0040]
Next, as shown in FIG. 5C, an injectable foam sponge (injectable foam sealing material) 8 is filled between the vertical plate portions of the joint members 1 and 1. When the injection-type foamed sponge 8 is solidified, its volume becomes about three times that of a liquid state. Therefore, it is necessary to consider the thickness after solidification when filling. The thickness of the injection-type foamed sponge 8 after solidification is adjusted to be greater than the height of the ribs 4 and 4. Before filling the injection type foam sponge 8, it is preferable to apply an adhesive to the inner side surfaces of the vertical plate portions 2 and 2.
[0041]
Next, after the foaming of the injection type foam sponge 8 is completed, as shown in FIG. 5- (d), the backup material 9 is fitted, and the receiving angles 10, 10 having an L-shaped cross section are placed on the vertical plates 2, 2, from above. Engage and fix to the inner side surface of. Then, by removing the plywood 6 and the particulate matter 7, a gap 12 is provided between the horizontal plate parts 3 and 3 and the injection type foamed sponge 8.
[0042]
Next, the entire joint member 1 is turned upside down and returned, thereby completing the expansion joint 13 according to the second embodiment using the injection type foamed sponge 8 as a sealing material as shown in FIG.
[0043]
Therefore, according to the above-described method of manufacturing the expansion joint, the same waterproofness and workability as those of the first embodiment, and a flat finish on the surface of the injection type foam sponge 8 can be ensured. Further, since the gap 12 is provided between the horizontal plate parts 3 and 3 and the injection-type foamed sponge 8, the surface can be protected and reinforced by applying a coating agent or the like to the gap 12. Further, the appearance of the injection-type foamed sponge 8 can be decorated to enhance the commercial value.
[0044]
<Embodiment 3>
FIGS. 6A to 6D show the structure of the expansion joint according to the third embodiment and the method of manufacturing the same.
[0045]
In FIG. 6A, reference numeral 20 denotes an expansion joint according to the third embodiment. 15 and 15 are a pair of joint members. As shown in FIG. 7, the joint members 15, 15 are formed of a pair of corrugated plates combined with their plate surfaces being vertical, and a wave-shaped gap 16 extending zigzag in the longitudinal direction of the seam of the road bridge is formed. It is combined as follows. A plurality of backup plates 17, 17 projecting toward each other and overlapping each other are fixed to the inner side surfaces of the joint members 15, 15 at intervals in the seam longitudinal direction. In addition, a plurality of rebars 18 protrude and extend outward on the outer side surfaces of the joint members 15, 15.
[0046]
The space between the joint members 15, 15 is filled with an injection type foamed sponge 8. The injection type foam sponge 8 is supported by the backup plates 17 and 17.
[0047]
Hereinafter, a method for manufacturing the expansion joint 20 according to the third embodiment will be described.
[0048]
In FIG. 6- (b), reference numeral 6 denotes a plywood laid under the joint members 15, 15 when performing this work. The joint members 15 and 15 are placed on the plywood 6 with the road surface facing down. The idle space 16 is filled with the granular material 7 without a gap so as to have a predetermined thickness. Here, as the granular material, it is preferable to use sand, slag, sand for casting, and the like.
[0049]
Next, as shown in FIG. 6C, the gap 16 between the joint members 15, 15 is filled with an injection-type foam sponge (injection-type foam sealing material) 8. When the injection-type foamed sponge 8 is solidified, the volume becomes about three times that of the liquid state. Therefore, the amount of the injection-type foamed sponge 8 to be filled must be determined in consideration of the thickness after solidification. The thickness of the injection-type foamed sponge 8 after solidification is equal to or lower than the lower surface of the lower backup plate 17 out of the two backup plates 17 projecting from the inner side surfaces of the joint members 15. Has been adjusted to. Before filling the injection type foam sponge 8, it is preferable to apply an adhesive to the inner side surfaces of the joint members 15, 15.
[0050]
Next, after the foaming of the injection type foaming sponge 8 is completed, the plywood 6 and the granular material 7 are removed as shown in FIG.
[0051]
Next, the entire joint member 1 is turned upside down and returned, thereby completing the expansion joint 20 according to the third embodiment using the injection-type foamed sponge 8 as a sealing material as shown in FIG.
[0052]
Therefore, according to the above-described method of manufacturing the expansion joint, the same waterproofness and workability as those of the first embodiment, and a flat finish on the surface of the injection type foam sponge 8 can be ensured.
[Brief description of the drawings]
FIG.
FIG. 7 is a perspective view showing a conventional expansion joint in a partial cross section.
FIG. 2
(A) Sectional drawing which shows the expansion joint which concerns on Embodiment 1 of this invention.
(B) Sectional drawing which shows the state which filled the granular material during play of the joint member which concerns on Embodiment 1 of this invention.
(C) Sectional drawing which shows the state which filled the joint member which concerns on Embodiment 1 of this invention with the injection type foaming sponge.
(D) Sectional drawing which shows the state which removed the granular material during play of the joint member which concerns on Embodiment 1 of this invention.
FIG. 3
The top view which shows the expansion joint which concerns on Embodiment 1 of this invention.
FIG. 4
(A) The graph which shows the relationship between the stress applied to the injection | pouring type foaming sponge used for this invention, and the elongation rate of a material.
(B) A graph showing the relationship between the stress applied to the injection type foamed sponge used in the present invention and the compressibility of the material.
FIG. 5
(A) Sectional drawing which shows the expansion joint which concerns on Embodiment 2 of this invention.
(B) Sectional drawing which shows the state which filled the granular material during play of the joint member which concerns on Embodiment 2 of this invention.
(C) Sectional drawing which shows the state which filled the joint member which concerns on Embodiment 2 of this invention with the injection type foaming sponge.
(D) Sectional drawing which shows the state which removed the granular material during play of the joint member which concerns on Embodiment 2 of this invention.
FIG. 6
(A) Sectional drawing which shows the expansion joint which concerns on Embodiment 3 of this invention.
(B) Sectional drawing which shows the state which filled the granular material during play of the joint member which concerns on Embodiment 3 of this invention.
(C) Sectional drawing which shows the state which filled the joint member which concerns on Embodiment 3 of this invention with the injection type foaming sponge.
(D) Sectional drawing which shows the joint member which concerns on Embodiment 3 of this invention in the state which removed the granular material during play.
FIG. 7
The top view which shows the expansion joint which concerns on Embodiment 3 of this invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Joint member 2 Vertical plate part 3 Horizontal plate part 3a Inside overhang part 3b Outside overhang part 4 Rib 5 Play space 6 Plywood 7 Granular material 8 Injection foam sponge 9 Backup material 10 Receiving angle 11 Expansion joint 12 Gap 13 Expansion joint 15 Joint member 16 Yuma 17 Backup plate 18 Reinforcing bar 20 Expansion joint

Claims

A pair of joint members each having a vertical plate portion extending in the seam longitudinal direction of the road bridge, the vertical plate portions facing each other and forming a play opening on the road surface,
A method for manufacturing an expansion joint for a road bridge, comprising: a sealing member provided so as to close between opposed vertical plate portions of the pair of joint members,
When injecting the injection-type foam sealing material for forming the seal member between the vertical plate portions, the joint member is inverted so that the road surface of the road bridge faces down, and the granular material is granulated during the play. By filling the material so as to have a predetermined height and then injecting the injection-type foam sealing material, the surface of the injection-type foam sealing material that is in contact with the granular material is finished to be substantially flat. Of manufacturing expansion joints for road bridges.

Each of the vertical plates has a vertical plate portion extending in the longitudinal direction of the seam of the road bridge, and a horizontal plate portion extending laterally from an upper end of the vertical plate portion and provided with a surface flush with the road surface. Parts facing each other, a pair of joint members projecting the horizontal plate part toward each other and forming a clearance between the tips thereof,
A method for manufacturing an expansion joint for a road bridge, comprising: a sealing member provided so as to close between opposed vertical plate portions of the pair of joint members,
When injecting the injection-type foam sealing material for forming the sealing member between the vertical plate portions, the joint member is inverted so that the surface of the horizontal plate portion faces down, and the horizontal plate is placed in the play space. By injecting the injection-type foam sealing material after filling the granular material so as to be substantially flush with the back surface of the part, it is possible to prevent the injection-type foam sealing material from flowing into the gap,
A method for manufacturing an expansion joint for a road bridge, wherein the surface of the injection-type foam sealing material in contact with the granular material is finished to be substantially flat.

Each of the vertical plates has a vertical plate portion extending in the longitudinal direction of the seam of the road bridge, and a horizontal plate portion extending laterally from an upper end of the vertical plate portion and provided with a surface flush with the road surface. Parts facing each other, a pair of joint members projecting the horizontal plate part toward each other and forming a clearance between the tips thereof,
A method for manufacturing an expansion joint for a road bridge, comprising: a sealing member provided so as to close between opposed vertical plate portions of the pair of joint members,
When injecting the injection-type foam sealing material for forming the seal member between the vertical plate portions, the joint member is inverted so that the surface of the horizontal plate portion faces down, and the granular material is removed during the play. Filling and filling the granular material between the vertical plate portions so as to have a predetermined height from the back surface of the horizontal plate portion, and then injecting the injection-type foam sealing material, thereby forming the injection-type foam seal. Prevent the material from flowing into the play space,
A method for manufacturing an expansion joint for a road bridge, wherein the surface of the injection-type foam sealing material in contact with the granular material is finished to be substantially flat.

A pair of joint members each having a vertical plate portion extending in the seam longitudinal direction of the road bridge, the vertical plate portions facing each other and forming a play opening on the road surface,
An expansion joint for a road bridge, comprising: a sealing member provided so as to close between opposed vertical plate portions of the pair of joint members,
The seal member is formed by an injection-type foam sealing material injected between the vertical plate portions, and has closed cells due to foaming,
An expansion joint for a road bridge, wherein the expansion and contraction characteristics of the seal member are such that a tensile stress is 1.0 MPa or less and an elongation is 50% or more.

The expansion joint for a road bridge according to claim 4,
An expansion joint for a road bridge, wherein the expansion and contraction characteristics of the seal member are a compression stress of 1.0 MPa or less and a compression ratio of 50% or more.