JP3924448B2 - Suspended scaffold construction device and suspension scaffold construction method - Google Patents

Suspended scaffold construction device and suspension scaffold construction method Download PDF

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JP3924448B2
JP3924448B2 JP2001292133A JP2001292133A JP3924448B2 JP 3924448 B2 JP3924448 B2 JP 3924448B2 JP 2001292133 A JP2001292133 A JP 2001292133A JP 2001292133 A JP2001292133 A JP 2001292133A JP 3924448 B2 JP3924448 B2 JP 3924448B2
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suspension
scaffold
guide rail
large pulling
suspended
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JP2003097046A (en
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仁 塚本
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ホリーエンジニアリング株式会社
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Description

【0001】
【発明の属する技術分野】
この発明は、橋梁等の塗り替え工事や建築物の外装工事等に使用する吊り足場の構築装置とその構築方法に関するものである。
【0002】
【従来の技術】
従来、橋梁や建築物等の構造物に使用する吊り足場の構築方法では、吊り足場の幅に合わせて単位長さの大引材をその長手方向に連結する作業を地上で行い、この連結された大引材を重機で吊り上げて構造物の所定の位置まで持っていき、チェーン等の吊材にて構造物に取り付けるといった工程を繰り返し行うことで、順次新たな吊り足場を構築していた。
【0003】
また、いわゆる送り出し工法を採用する場合には、図8に示したように、新たな大引材50aを送り出す手段として、既設吊り足場51から新たな吊り足場を構築していく方向(前方)に向かってスライド可能な長尺の送り出し管52を送り出す際の案内となるスライドクランプ53によって既設吊り足場51に取り付け、この送り出し管52の先端部に固定クランプ54を介して新たな大引材50aを固定し、送り出し管52をスライドクランプ53内を既設吊り足場の51の前方にスライドさせることで新たな大引材50aを所定の位置に移動させる方法によっている。
【0004】
そして、新たな大引材50aを固定している固定クランプ54には送り出し用吊りチェーン55が取り付けてあり、この送り出し用吊りチェーン55の他方の端は送り出し管52を前方にスライドする以前に構造物56に固定しておく。このとき、送り出し管52を前方にスライドした際に、送り出し用吊りチェーン55がぴんと張った状態で新たな大引材50aが丁度1スパン分先に移動して送り出し管52が停止するように、送り出し用吊りチェーン55の長さを調整しておく。このような工夫がなされることで、新たな大引材50aの1スパンに相当する送り出し量が自動的に決定されるといった便利さがあった。
【0005】
しかしながら、以上のような従来の送り出し工法にあっては、新たな大引材50aの送り出し手段に関し、いくつかの問題点があった。
【0006】
つまり、新たな大引材50aを1スパン分送り出した状態で送り出し管52を水平に保つためには長手方向に2個のスライドクランプ53で支持されていなければならないため、送り出す前には送り出し管52が長手方向にスイドクランプ53を少なくとも3個設けなければならない。そこで、スライドクランプ53は大引材50に固定されているので、大引材50が3本必要となり、送り出し工法を採用する場合には、最初の既設吊り足場51として2スパン分の大きなスペースを確保しなければならなかった。そのため、このような大きな既設吊り足場51が構築できない箇所にあっては、この送り出し工法を採用することができなかった。
【0007】
また、送り出し管52は既設吊り足場51の幅方向の左右に1本ずつ設けられており、その左右の送り出し管52,52を人手によって同時に同じ量ずつ前方へスライドさせることは難しく、いずれか一方の送り出し管52のスライドのタイミングが他方の送り出し管52より遅れた場合にはスライドクランプ53の軸心と送り出し管52の軸心との平行度が狂ってしまうためスライド自体ができなくなることがあり、スライド作業に正確さが要求されるため送り出し作業が面倒であった。
【0008】
【発明が解決しようとする課題】
以上のように、新たな大引材の位置決めを地上に据え付けた重機で行う方法にあっては、重機と重機を操作するオペレータを必要とするためコスト高を招いていた。また、従来の送り出し工法にあっては、採用できる現場が最初に2スパン分の既設吊り足場が構築できる所に限定され、左右の送り出し管を同時に送り出すこと自体困難な作業であるため、新たな大引材の送り出し作業に多くの時間を要し、結果として吊り足場の構築時間が長くなっていた。
【0009】
そこで、この発明は、重機を使用することなくコストを低く抑え、大きな既設吊り足場を必要とせず、かつ大引材の送り出し作業が容易で全体として従来より短い時間で吊り足場を構築できる装置とその構築方法を提供することを課題としている。
【0010】
請求項1に記載の発明は、構造物より垂下する吊材により支持されて平行に配設される複数の大引材を有する吊り足場を構築する装置であって、前記構造物に固定されるガイドレールに沿って進退自在な可動吊り治具にて新たに設ける大引材を前方に送り出すようにした送出装置が、前記構造物に対して移動自在であり、前記可動吊り治具には、該可動吊り治具を前記ガイドレールに沿って前進させることのできる前進用牽引部材と後退させることのできる後退用牽引部材とが接続されており、このうち前進用牽引部材は前記ガイドレールの先端部に設けた滑車を介して、又後退用索引部材は直に前記ガイドレールの後端部側に延長されている吊り足場の構築装置としたことを特徴とする
【0011】
請求項2に記載の発明は、請求項1に記載の構成に加え、構造物より垂下する吊材により支持されて平行に配設される複数の大引材を有する吊り足場を構築する装置であって、既設吊り足場の最先端に位置する前記吊材の前方に、新たに設ける大引材を仮置きするための受金具を有することを特徴としている。
【0013】
請求項に記載の発明は、請求項の構成に加えて、前記ガイドレールは長手方向に沿った中空部を有し、該中空部に前記前進用牽引部材が収容されていることを特徴としている。
【0014】
請求項4に記載の発明は、構造物より垂下する吊材により支持されて平行に配設される複数の大引材を有する吊り足場を構築する方法であって、前記構造物に固定されるガイドレールに沿って前進させることのできる前進用牽引部材と後退させることのできる後退用牽引部材とが接続されており、このうち前進用牽引部材は前記ガイドレールの先端部に設けた滑車を介して、又後退用索引部材は直に前記ガイドレールの後端部側に延長されている可動吊り治具を吊り足場の構築装置に取り付け、前記前進用牽引部材を引張ることにより、前記可動吊り治具にて新たに設ける大引材を約1スパン分前方に送り出し、該新たな大引材を吊材にて前記構造物に吊り下げ、その後前記ガイドレールを前記構造物の前方に移動させることで、前方に向かって順次新たな吊り足場を構築していくことを特徴としている。
【0015】
請求項5に記載の発明は、請求項4に記載の手順に加え、構造物より垂下する吊材により支持されて平行に配設される複数の大引材を有する吊り足場を構築する方法であって、既設吊り足場の最先端に位置する前記吊材の前方に取り付けた受金具の上で新たに設ける大引材を前記吊り足場の幅に合わせて必要数を連結し、該連結された新たな大引材を前方へ送り出すことで、前方に向かって順次新たな吊り足場を構築していくことを特徴としている。
【0016】
【発明の実施の形態】
以下、この発明の実施の形態について説明する。
【0017】
まず、この発明に係る吊り足場の構築装置の構成について説明する。
【0018】
図1は、この発明の実施の形態に係る吊り足場の構築装置を構造物に取り付けた状態を示した正面図である。図2は、同吊り足場の構築装置のガイドレールを構造物に取り付けるための固定金具と構造物との関係を示した側面図である。
【0019】
図1では、構造物である橋梁の梁材1のフランジ2にガイドレール3を固定した状態を示している。図2に示したように、フランジ2はしゃこ万力の形状をした把持具4で固定され、ガイドレール3はガイドレール3の断面形状に対応した形状の把持部5を有するクランプ6で固定されており、把持具4とクランプ6とは連結金具7で固定され固定金具8全体が略L字形を呈し、フランジ2の端面から外側にガイドレール3が配置されるようになっている。
【0020】
図3は、ガイドレールに可動吊り治具のブラケットが取り付けられている状態を示した側面図である。
【0021】
ガイドレール3には、ガイドレール3に沿って進退自在な可動吊り治具9が取り付けられている。可動吊り治具9としては、断面コ字形のブラケット10の中央の水平部11近くの内側に回転自在のローラ12を取り付け、このローラ12がガイドレール3の上面を転がるようにし、ブラケット10の垂直部13の先端部には軸心がブラケット10の幅方向に向かう固定軸14を有している。固定軸14にはチェーンブロック15が掛止されており、チェーンブロック15の吊りフック16に新たな大引材17を吊り下げることができるようになっている。
【0022】
ガイドレール3は新しく構築する吊り足場の1.5〜2スパン分の長さを有し、その先端部が既設吊り足場24の最先端の大引材25aから約1スパン分前方に張り出すようにして、固定金具8にて構造物26に固定される。なお、既設吊り足場24からのガイドレール3の張り出し量は、丁度1スパン分である必要はなく、1スパンの寸法を多少前後する値でよい。仮に張り出し量が1スパンより長い場合には、ガイドレール3の先端部より手前で可動吊り治具9を止めればよく、張り出し量が1スパン分より短い場合には、可動吊り治具9と新たな大引材17とを繋ぐチェーンブロック15が斜めになるだけで作業上支障はない。
【0023】
ガイドレール3は2個の固定金具8でフランジ2に固定されているが、1個はガイドレール3の後端部付近に取り付けられ、もう1個はガイドレール3の中央部付近に取り付けられる。そして、可動吊り治具9は、中央部付近に取り付けられる固定金具8の前方に配置されている。
【0024】
ブラケット10の外側の上部には後方と前方に断面コ字形の牽引用フック18が1個ずつ取り付けられている。後方の牽引用フック18aには後退用牽引部材19が繋がれ、ガイドレール3の上面を通ってガイドレール3の後端部側まで延長されている。前方の牽引用フック18bには前進用牽引部材20が繋がれ、ガイドレール3の上面を通ってガイドレール3の先端部まで延長され、さらに先端部に設けられた滑車21を介してガイドレール3の中空部22を通ってガイドレール3の後端部側まで延長されている。
【0025】
なお、図1に示した実施の形態では、ガイドレール3として角パイプを使用した例を表しているが、可動吊り治具9の移動の際の案内となり、前進用牽引部材20が収納できるものであればその断面形状にこだわることはない。したがって、丸パイプや断面がチャンネル形をしたような中空部を有するものであってもよい。
【0026】
次に、以上説明した構成を有する実施の形態を使用した吊り足場の構築方法について説明する。
【0027】
実施の形態に係る吊り足場の構築装置23を使用して新たな吊り足場を構築していくには、1スパン分の既設吊り足場24があればよい。既設吊り足場24は、所定の幅方向の長さを有する2本の大引材25,25が構造物26から垂下された複数の吊材27によって互いに平行でかつ水平に吊り下げられており、この2本の大引材25,25の間に複数の根太材28を掛け渡すことによって格子状枠体を形成し、この格子状枠体の上に杉板やコンパネ等の床材29が載置されている。
【0028】
図4は、既設吊り足場の一部破断した斜視図であり、図5は、既設吊り足場における新たな大引材の連結作業状態を示した一部破断の斜視図である。
【0029】
そこで、まず既設吊り足場24の送り出し方向に位置する最先端の大引材25aを吊り下げている吊材27aの前方に、新たに設ける大引材17を仮置きするための受金具30を取り付ける。受金具30は、単位長さの1本の新たな大引材17に対して少なくとも2本使用することが望ましい。
【0030】
ここで、受金具30は、新たな大引材17を置くための水平材31と、この水平材31の一端に設けた最先端の大引材25aに取り付けるための係止部32と、水平材31の他端に上向きに突設したストッパー部33とを有している。これにより、受金具30は、最先端の大引材25aの上から係止部32を宛うようにして簡単に取り付けること及び使用しないときには最先端の大引材25aから持ち上げるようにして簡単に取り外すことができ、連結作業時にあっては新たな大引材17が受金具30から脱落することがない。
【0031】
既設吊り足場24の最先端の大引材25aに受金具30を取り付けたら、既設吊り足場24の床材29の上に予め準備しておいた単位長さの新たな大引材17を必要な本数だけ吊材同士27a,27aの間から前方に張り出して、受金具30の水平材31の上に載せて、新たな大引材同士17,17,17,・・・をその長手方向に一直線状になるよう接続金具33にて連結していく。
【0032】
この連結作業が終わったら、連結された新たな大引材17をチェーンブロック15の吊りフック16に吊り下げ、チェーンブロック15のハンドルを操作して吊りフック16を上昇させて連結された新たな大引材17が既設の大引材25の高さより僅かに高い位置に設定する。
【0033】
チェーンブロック15による連結された新たな大引材17の高さの設定が済んだら、前進用牽引部材20をガイドレール3の後端部側から引っ張ることで可動吊り治具9を前方の所定の位置まで送り出す。このとき、予めガイドレール3の先端部が所定の位置になるようにガイドレール3を構造物26に固定しておけば、送り出す量を制御する手間が省ける。また、送り出しに際しては、ガイドレール3の上面をブラケット10に設けたローラ12が回転し、先端部の滑車21の回転と相俟って、前進用牽引部材20を僅かな力で引っ張ることで可動吊り治具9が前方に送り出される。しかも、ガイドレール3の横断面の幅よりブラケット10の垂直部13,13間の内寸法をある程度大きく設定することにより、既設吊り足場24の幅方向の左右に配置された可動吊り治具9,9の送り出し量に多少のずれが生じた場合でも、送り出しが円滑に行える。
【0034】
図6に示したように、新たな大引材17が所定の位置まで送り出されたら、新たな大引材17に既設吊り足場24から足場板34を掛け渡す。掛け渡された足場板34を作業者が渡っていき、送り出された新たな大引材17に対してその長手方向に渡って複数の吊材27を使用し、その下端部を新たな大引材27に取り付けると共に、その上端部を梁材1のフランジ2に固定する。
【0035】
吊材27によって新たな大引材17が構造物26に取り付けられたら、チェーンブロック15のハンドルを操作して吊りフック16を下降させ、吊りフック16を新たな大引材17から取り外すことにより、吊材27に吊り下げられた新たな大引材17が既設吊り足場24の大引材25と同じ高さに設定される。
【0036】
次に、図7に示したように、既設吊り足場24の最先端の大引材25aと新たな大引材17との間に複数の根太材28を掛け渡すことによって格子状枠体を形成する。必要な数の根太材28の掛け渡し作業が終了したら、その根太材28の上に杉板やコンパネ等の床材29を載置することで新たな吊り足場35が完成できる。
【0037】
【発明の効果】
以上説明してきたように、請求項1に記載の発明によれば、構造物に固定されるガイドレールに沿って進退自在な可動吊り治具にて新たに設ける大引材を前方に送り出すようにした送出装置が、構造物に対して移動自在であるので、ガイドレールをその先端部が既設吊り足場の最先端の大引材から約1スパン分張り出すようにして構造物に固定し、可動吊り治具に新たな大引材を取り付けて可動吊り治具をガイドレールの先端部に向かって移動するようにすれば、作業者が既設吊り足場から新たな大引材を所定の位置に送り出すことができる。
【0038】
このため、新たな大引材の位置決めに際し重機を使用する必要がないので、重機と重機を操作するオペレータが不要となるからコストを低く抑えることができる。また、従来の送り出し工法で使用しているスライドクランプとスライドクランプを固定する大引材を必要としないので、大きな既設吊り足場を必要としないため、適用できる範囲が広くなる。さらに、新たな大引材はガイドレールに沿って進退自在な可動吊り治具によって送り出されるので、送り出し作業が容易なため全体として従来より短い時間で吊り足場を構築できる。
また、可動吊り治具には、該可動吊り治具をガイドレールに沿って前進させることのできる前進用牽引部材と後退させることのできる後退用牽引部材とが接続されており、このうち前進用牽引部材はガイドレールの先端部に設けた滑車を介して、又後退用索引部材は直にガイドレールの後端部側に延長されているので、前進用牽引部材と後退用牽引部材とをガイドレールの後端部側から操作することで可動吊り治具の前進と後退が行えるため、安全に吊り足場の構築作業ができる。
【0039】
また、請求項2に記載された発明によれば、既設吊り足場の最先端に位置する吊材の前方に、新たに設ける大引材を仮置きするための受金具を有するので、受金具の上に単位長さの大引材を載せてその長手方向に連結する作業を既設吊り足場でできると共に、受金具の前方には吊材が存在しないから連結した新たな大引材を可動吊り治具に取り付けることでその位置から直接送り出すことができる。
【0041】
請求項に記載された発明によれば、ガイドレールは長手方向に沿った中空部を有し、該中空部に前進用牽引部材が収容されているので、請求項3の効果に加え、前進用牽引部材がガイドレールから垂れ下がるようなことがないから前進用牽引部材が吊り足場の構築作業の邪魔になることがない。
【0042】
請求項に記載された発明によれば、構造物に固定されるガイドレールに沿って進退自在な可動吊り治具にて新たに設ける大引材を約1スパン分前方に送り出し、該新たな大引材を吊材にて構造物に吊り下げ、その後ガイドレールを構造物の前方に移動させることで、前方に向かって順次新たな吊り足場を構築していくので、作業者が既設吊り足場から新たな大引材を所定の位置に送り出すことができる。
【0043】
このため、新たな大引材の位置決めに際し重機を使用する必要がないので、重機と重機を操作するオペレータが不要となるからコストを低く抑えることができる。また、従来の送り出し工法で使用しているスライドクランプとスライドクランプを固定する大引材を必要としないので、大きな既設吊り足場を必要としないため、適用できる範囲が広くなる。さらに、新たな大引材はガイドレールに沿って進退自在な可動吊り治具によって送り出されるので、送り出し作業が容易なため全体として従来より短い時間で吊り足場を構築できる。
【0044】
請求項に記載された発明によれば、既設吊り足場の最先端に位置する吊材の前方に取り付けた受金具の上で新たに設ける大引材を吊り足場の幅に合わせて必要数を連結し、該連結された新たな大引材を前方へ送り出すことで、前方に向かって順次新たな吊り足場を構築していくので、受金具の上に単位長さの大引材を載せてその長手方向に連結する作業を既設吊り足場からできると共に、受金具の前方には吊材が存在しないから連結した新たな大引材を可動吊り治具に取り付けることでその位置から直接送り出すことができる。
【0045】
そのため、幅が大きな吊り足場であっても、必要な長さの大引材を地上で組み立てて重機で吊り足場まで吊り上げるといった手間がいらない。
【図面の簡単な説明】
【図1】 この発明の実施の形態に係る吊り足場の構築装置を構造物に取り付けた状態を示した正面図である。
【図2】 同吊り足場の構築装置のガイドレールを構造物に取り付けるための固定金具と構造物との関係を示した側面図である。
【図3】 同吊り足場の構築装置のガイドレールに可動吊り治具のブラケットが取り付けられている状態を示した側面図である。
【図4】 同吊り足場の構築装置の既設吊り足場の一部破断した斜視図である。
【図5】 同吊り足場の構築装置の既設吊り足場における新たな大引材の連結作業状態を示した一部破断した斜視図である。
【図6】 同吊り足場の構築装置において新たな大引材を送り出したところを示した正面図である。
【図7】 同吊り足場の構築装置において床材を載置する状態を示した正面図である。
【図8】 従来の送り出し工法による吊り足場の構築方法の説明図である。
【符号の説明】
1 梁材
2 フランジ
3 ガイドレール
8 固定金具
9 可動吊り治具
10 ブラケット
12 ローラ
15 チェーンブロック
16 吊りフック
17 新たな大引材
18 牽引用フック
19 後退用牽引部材
20 前進用牽引部材
21 滑車
22 中空部
23 吊り足場の構築装置
24 既設吊り足場
25 大引材
25a 最先端の大引材
26 構造物
27 吊材
27a 最先端の吊材
28 根太材
29 床材
30 受金具
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension scaffold construction apparatus and a construction method for use in repainting work such as a bridge and exterior construction of a building.
[0002]
[Prior art]
Conventionally, in the construction method of a suspension scaffold used for structures such as bridges and buildings, the work of connecting a large length of pulling material in the longitudinal direction according to the width of the suspension scaffold is performed on the ground. New suspension scaffolds were constructed in sequence by repeatedly carrying out the process of lifting the large pulling material with a heavy machine and bringing it to a predetermined position of the structure and attaching it to the structure with a hanging material such as a chain.
[0003]
Further, when the so-called delivery method is adopted, as shown in FIG. 8, as a means for delivering a new large pulling material 50a, in a direction (forward) in which a new suspension scaffold is constructed from the existing suspension scaffold 51. A long pulling pipe 52 slidable toward the end is attached to an existing suspension scaffold 51 by means of a slide clamp 53 that serves as a guide for sending out, and a new large pulling material 50 a is attached to the tip of the sending pipe 52 via a fixed clamp 54. The new large pulling material 50a is moved to a predetermined position by fixing it and sliding the delivery pipe 52 in the slide clamp 53 forward of the existing suspension scaffold 51.
[0004]
A feeding suspension chain 55 is attached to the fixed clamp 54 that fixes the new large pulling material 50a, and the other end of the feeding suspension chain 55 is structured before the delivery pipe 52 is slid forward. It is fixed to the object 56. At this time, when the delivery pipe 52 is slid forward, the new pulling material 50a moves just one span ahead with the delivery suspension chain 55 tensioned, and the delivery pipe 52 stops. The length of the supply suspension chain 55 is adjusted. As a result of such a device, there is a convenience that a feed amount corresponding to one span of a new large draw material 50a is automatically determined.
[0005]
However, the conventional delivery method as described above has some problems with the delivery means for the new large pull material 50a.
[0006]
That is, in order to keep the delivery pipe 52 horizontal in a state in which a new large pulling material 50a is delivered by one span, it must be supported by two slide clamps 53 in the longitudinal direction. 52 must be provided with at least three suid clamps 53 in the longitudinal direction. Therefore, since the slide clamp 53 is fixed to the large pulling material 50, three large pulling materials 50 are required, and when adopting the feeding method, a large space for two spans is provided as the first existing suspension scaffold 51. Had to secure. For this reason, this delivery method cannot be adopted in a place where such a large existing suspended scaffold 51 cannot be constructed.
[0007]
Further, one delivery pipe 52 is provided on each of the left and right in the width direction of the existing suspension scaffold 51, and it is difficult to manually slide the left and right delivery pipes 52, 52 forward by the same amount at the same time. When the timing of the slide of the delivery pipe 52 is delayed from that of the other delivery pipe 52, the parallelism between the axis of the slide clamp 53 and the axis of the delivery pipe 52 will be out of order, and the slide itself may not be possible. Since the slide work requires accuracy, the sending work is troublesome.
[0008]
[Problems to be solved by the invention]
As described above, the method of performing positioning of a new large pulling material with a heavy machine installed on the ground requires a heavy machine and an operator for operating the heavy machine, resulting in high costs. In addition, in the conventional delivery method, the site where it can be adopted is limited to the place where an existing suspension scaffold for 2 spans can be constructed at first, and it is difficult to simultaneously deliver the left and right delivery pipes. It took a lot of time to send out the large pulling material, and as a result, the construction time of the suspension scaffold was long.
[0009]
Therefore, the present invention is an apparatus that can reduce the cost without using heavy machinery, does not require a large existing suspension scaffold, and can easily construct a suspension scaffold in a shorter time as compared with the prior art, because the work of feeding a large pulling material is easy. The challenge is to provide a method for its construction.
[0010]
The invention according to claim 1 is an apparatus for constructing a suspended scaffolding having a plurality of large pulling members supported in parallel by a suspension member suspended from a structure and fixed to the structure. the along the guide rail newly provided at retractably movable lifting jig Obiki material delivery apparatus that sends forward Ri movable der respect to the structure, the movable lifting jig A forward traction member capable of advancing the movable suspension jig along the guide rail and a backward traction member capable of being retracted are connected, and the forward traction member is connected to the guide rail. It is characterized in that it is a suspension scaffold construction device in which the retraction index member is directly extended to the rear end side of the guide rail through a pulley provided at the front end portion .
[0011]
The invention according to claim 2 is an apparatus for constructing a suspension scaffold having a plurality of large pulling members that are supported in parallel and arranged in parallel with the suspension member suspended from the structure in addition to the configuration according to claim 1. And it has the receiving metal fitting for temporarily placing the newly provided large drawing material ahead of the said suspension material located in the forefront of the existing suspension scaffold.
[0013]
According to a third aspect of the present invention, in addition to the configuration of the first aspect , the guide rail has a hollow portion along the longitudinal direction, and the forward traction member is accommodated in the hollow portion. It is said.
[0014]
The invention according to claim 4 is a method for constructing a suspended scaffolding having a plurality of large pulling members that are supported and arranged in parallel by a suspension member hanging from the structure, and is fixed to the structure. A forward traction member that can be moved forward along the guide rail and a backward traction member that can be moved backward are connected. Of these, the forward traction member is connected via a pulley provided at the tip of the guide rail. The retraction index member is attached to a suspension scaffold construction device with a movable suspension jig that is directly extended to the rear end side of the guide rail, and the advancement traction member is pulled, thereby A large pulling material newly provided by the tool is sent forward by about one span, the new large pulling material is suspended from the structure by the hanging material, and then the guide rail is moved to the front of the structure. And forward It is characterized in that build a sequential new hanging scaffold Te.
[0015]
The invention according to claim 5 is a method for constructing a suspension scaffold having a plurality of large pulling members supported in parallel and supported by a suspension member suspended from a structure in addition to the procedure according to claim 4. In addition, the necessary number of large pulling materials newly provided on the receiving bracket attached to the front of the suspension material located at the forefront of the existing suspension scaffold is connected in accordance with the width of the suspension scaffold, and the connected It is characterized by constructing new suspension scaffolds one after another by sending new large pulls forward.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0017]
First, the structure of the suspension scaffold construction apparatus according to the present invention will be described.
[0018]
FIG. 1 is a front view showing a state in which a suspension scaffold construction device according to an embodiment of the present invention is attached to a structure. FIG. 2 is a side view showing the relationship between the fixture and the structure for attaching the guide rail of the suspension scaffold construction device to the structure.
[0019]
FIG. 1 shows a state in which a guide rail 3 is fixed to a flange 2 of a beam 1 of a bridge that is a structure. As shown in FIG. 2, the flange 2 is fixed by a gripping tool 4 having a shape of a scissors vise, and the guide rail 3 is fixed by a clamp 6 having a gripping portion 5 having a shape corresponding to the cross-sectional shape of the guide rail 3. The holding tool 4 and the clamp 6 are fixed by a connecting metal fitting 7, and the entire fixing metal fitting 8 is substantially L-shaped, and the guide rail 3 is arranged on the outer side from the end face of the flange 2.
[0020]
FIG. 3 is a side view showing a state where the bracket of the movable suspension jig is attached to the guide rail.
[0021]
A movable suspension jig 9 that is movable back and forth along the guide rail 3 is attached to the guide rail 3. As the movable suspension jig 9, a rotatable roller 12 is attached inside the central portion of the bracket 10 having a U-shaped cross section, and the roller 12 rolls on the upper surface of the guide rail 3. A fixed shaft 14 whose axis is directed in the width direction of the bracket 10 is provided at the tip of the portion 13. A chain block 15 is hooked on the fixed shaft 14, and a new large pulling material 17 can be suspended from a suspension hook 16 of the chain block 15.
[0022]
The guide rail 3 has a length corresponding to 1.5 to 2 spans of a newly constructed suspension scaffold, and the tip of the guide rail 3 protrudes forward about one span from the most advanced large pulling material 25a of the existing suspension scaffold 24. Then, it is fixed to the structure 26 by the fixing bracket 8. It should be noted that the amount of the guide rail 3 protruding from the existing suspension scaffold 24 does not have to be exactly one span, and may be a value that slightly fluctuates the size of one span. If the amount of overhang is longer than one span, the movable suspension jig 9 may be stopped before the end of the guide rail 3, and if the amount of overhang is shorter than one span, the movable suspension jig 9 and a new one are added. The chain block 15 connecting the large pulling material 17 is only inclined and there is no problem in operation.
[0023]
The guide rail 3 is fixed to the flange 2 with two fixing brackets 8. One is attached near the rear end of the guide rail 3 and the other is attached near the center of the guide rail 3. The movable suspension jig 9 is disposed in front of the fixture 8 attached near the center.
[0024]
One pulling hook 18 having a U-shaped cross section is attached to the upper part of the outside of the bracket 10 at the rear and the front. A retracting pulling member 19 is connected to the rear pulling hook 18 a and extends to the rear end side of the guide rail 3 through the upper surface of the guide rail 3. A forward traction member 20 is connected to the front traction hook 18b, extends through the upper surface of the guide rail 3 to the distal end portion of the guide rail 3, and further passes through a pulley 21 provided at the distal end portion. Is extended to the rear end portion side of the guide rail 3 through the hollow portion 22.
[0025]
In the embodiment shown in FIG. 1, an example in which a square pipe is used as the guide rail 3 is shown. However, the guide traction member 20 can be accommodated as a guide when moving the movable suspension jig 9. If so, the cross-sectional shape is not particular. Therefore, a round pipe or a hollow part having a channel-like cross section may be used.
[0026]
Next, a construction method of a suspended scaffold using the embodiment having the configuration described above will be described.
[0027]
In order to construct a new suspended scaffold using the suspended scaffold constructing apparatus 23 according to the embodiment, it is sufficient that there is an existing suspended scaffold 24 for one span. The existing suspension scaffold 24 is suspended in parallel and horizontally with a plurality of suspension members 27 having two large pulling members 25, 25 having a length in a predetermined width direction suspended from a structure 26, A lattice frame is formed by spanning a plurality of joists 28 between the two large draw members 25, 25, and a floor material 29 such as a cedar board or a panel is mounted on the lattice frame. Is placed.
[0028]
FIG. 4 is a partially broken perspective view of an existing suspension scaffold, and FIG. 5 is a partially broken perspective view showing a state of connecting a new large pulling material in the existing suspension scaffold.
[0029]
Therefore, first, a bracket 30 for temporarily placing the newly provided large pulling material 17 is attached in front of the hanging material 27a that suspends the state-of-the-art large pulling material 25a located in the feeding direction of the existing hanging scaffold 24. . It is desirable to use at least two metal fittings 30 for one new large drawing material 17 having a unit length.
[0030]
Here, the bracket 30 includes a horizontal member 31 for placing a new large pulling material 17, a locking portion 32 for attaching to the most advanced large pulling material 25 a provided at one end of the horizontal member 31, The other end of the material 31 has a stopper portion 33 projecting upward. As a result, the bracket 30 can be easily attached so that the locking portion 32 is addressed from the top of the state-of-the-art large pulling material 25a and lifted from the state-of-the-art large pulling material 25a when not in use. It can be removed, and the new large pulling material 17 does not fall off from the receiving bracket 30 during the connection work.
[0031]
When the bracket 30 is attached to the state-of-the-art large pulling material 25a of the existing suspension scaffold 24, a new large pulling material 17 having a unit length prepared in advance on the floor material 29 of the existing suspension scaffold 24 is required. As many as the number of the suspension members 27a and 27a are projected forward and placed on the horizontal member 31 of the bracket 30, and the new large pull members 17, 17, 17,. It connects with the connection metal fitting 33 so that it may become a shape.
[0032]
When this connection work is finished, the new large pulling material 17 connected is suspended from the suspension hook 16 of the chain block 15 and the handle hook of the chain block 15 is operated to raise the suspension hook 16 to connect the new large pulling material 17. The drawing material 17 is set at a position slightly higher than the height of the existing large drawing material 25.
[0033]
After the setting of the height of the new large pulling material 17 connected by the chain block 15 is completed, the movable lifting jig 9 is moved to a predetermined front by pulling the forward pulling member 20 from the rear end side of the guide rail 3. Send to position. At this time, if the guide rail 3 is fixed to the structure 26 in advance so that the tip end portion of the guide rail 3 is at a predetermined position, it is possible to save time and effort for controlling the amount to be delivered. Further, when feeding, the roller 12 provided on the bracket 10 on the upper surface of the guide rail 3 rotates, and in combination with the rotation of the pulley 21 at the tip, it is movable by pulling the forward pulling member 20 with a slight force. The hanging jig 9 is sent forward. Moreover, by setting the inner dimension between the vertical portions 13 and 13 of the bracket 10 to a certain extent larger than the width of the cross section of the guide rail 3, the movable suspension jigs 9 disposed on the left and right in the width direction of the existing suspension scaffold 24, Even when a slight deviation occurs in the delivery amount of 9, the delivery can be performed smoothly.
[0034]
As shown in FIG. 6, when the new large draw material 17 is sent to a predetermined position, the scaffold plate 34 is hung from the existing suspended scaffold 24 to the new large draw material 17. The operator crosses the suspended scaffolding plate 34 and uses a plurality of suspension members 27 in the longitudinal direction with respect to the new large pulling material 17 that has been sent out, and the lower end portion is newly redrawn. While being attached to the material 27, the upper end portion thereof is fixed to the flange 2 of the beam material 1.
[0035]
When the new large pulling material 17 is attached to the structure 26 by the hanging material 27, by operating the handle of the chain block 15 to lower the hanging hook 16 and removing the hanging hook 16 from the new large pulling material 17, The new large pulling material 17 suspended from the hanging material 27 is set to the same height as the large pulling material 25 of the existing hanging scaffold 24.
[0036]
Next, as shown in FIG. 7, a lattice frame is formed by spanning a plurality of joists 28 between the state-of-the-art large draw material 25 a of the existing suspended scaffold 24 and the new large draw material 17. To do. When the necessary number of joists 28 have been transferred, a new suspension scaffold 35 can be completed by placing a floor material 29 such as a cedar board or a panel on the joists 28.
[0037]
【The invention's effect】
As described above, according to the first aspect of the present invention, the large pulling material newly provided by the movable suspension jig that is movable forward and backward along the guide rail fixed to the structure is sent forward. Since the delivery device is movable with respect to the structure, the guide rail is fixed to the structure so that the tip of the guide rail protrudes from the state-of-the-art large pulling material of the existing suspended scaffolding by about one span. If a new large pulling material is attached to the hanging jig and the movable hanging jig is moved toward the tip of the guide rail, the operator sends the new large pulling material from the existing hanging scaffold to a predetermined position. be able to.
[0038]
For this reason, since it is not necessary to use a heavy machine when positioning a new large pulling material, a heavy machine and an operator for operating the heavy machine are not required, so that the cost can be reduced. In addition, since the slide clamp used in the conventional delivery method and the large pulling material for fixing the slide clamp are not required, a large existing suspension scaffold is not required, so the applicable range is widened. Furthermore, since the new large pulling material is sent out along a guide rail by a movable lifting jig that can move forward and backward, the feeding work is easy, so that a suspension scaffold can be constructed as a whole in a shorter time than before.
The movable suspension jig is connected to a forward traction member that can advance the movable suspension jig along the guide rail and a backward traction member that can be retracted. The traction member is extended through a pulley provided at the front end portion of the guide rail, and the retraction index member is directly extended to the rear end portion side of the guide rail, so that the forward traction member and the reverse traction member are guided. Since the movable suspension jig can be moved forward and backward by operating from the rear end side of the rail, the construction work of the suspension scaffold can be performed safely.
[0039]
Moreover, according to the invention described in claim 2, since the bracket for temporarily placing the newly provided large pulling material is provided in front of the suspension member located at the forefront of the existing suspension scaffold, Work can be done on the existing suspension scaffolding by placing a unit length of large pulling material on top of it, and there is no hanging material in front of the bracket. By attaching to the tool, it can be sent directly from that position.
[0041]
According to the invention described in claim 3 , the guide rail has a hollow portion along the longitudinal direction, and the advancement traction member is accommodated in the hollow portion. Since the traction member for use does not hang down from the guide rail, the traction member for advance does not interfere with the construction work of the suspension scaffold.
[0042]
According to the fourth aspect of the present invention, a large pulling material newly provided by a movable lifting jig that is movable forward and backward along a guide rail fixed to the structure is sent forward by about one span, and the new By suspending the large pulling material on the structure with the suspension material, and then moving the guide rail to the front of the structure, new suspension scaffolds will be built sequentially forward, so that the operator can install the existing suspension scaffolds. A new large pulling material can be sent to a predetermined position.
[0043]
For this reason, since it is not necessary to use a heavy machine when positioning a new large pulling material, a heavy machine and an operator for operating the heavy machine are not required, so that the cost can be reduced. In addition, since the slide clamp used in the conventional delivery method and the large pulling material for fixing the slide clamp are not required, a large existing suspension scaffold is not required, so the applicable range is widened. Furthermore, since the new large pulling material is sent out along a guide rail by a movable lifting jig that can move forward and backward, the feeding work is easy, so that a suspension scaffold can be constructed as a whole in a shorter time than before.
[0044]
According to the invention described in claim 5 , the necessary number of large pulling materials newly provided on the support bracket attached to the front of the suspension material located at the forefront of the existing suspension scaffold is adjusted according to the width of the suspension scaffold. By connecting and sending out the newly connected large pulling material forward, a new suspension scaffold will be constructed in order toward the front, so put the large pulling material of unit length on the bracket The work to connect in the longitudinal direction can be done from the existing suspension scaffold, and since there is no suspension material in front of the bracket, it can be sent directly from that position by attaching a new large pulling material connected to the movable suspension jig it can.
[0045]
Therefore, even if the suspension scaffold is wide, there is no need to assemble a large pulling material of a required length on the ground and lift it up to the suspension scaffold with heavy equipment.
[Brief description of the drawings]
FIG. 1 is a front view showing a state in which a suspension scaffold construction device according to an embodiment of the present invention is attached to a structure.
FIG. 2 is a side view showing a relationship between a fixture and a structure for attaching a guide rail of the suspension scaffold construction device to the structure.
FIG. 3 is a side view showing a state where a bracket of a movable suspension jig is attached to a guide rail of the suspension scaffold construction device.
FIG. 4 is a partially broken perspective view of an existing suspension scaffold of the suspension scaffold construction apparatus.
FIG. 5 is a partially broken perspective view showing a connection state of a new large pulling material in an existing suspension scaffold of the suspension scaffold construction apparatus.
FIG. 6 is a front view showing a state where a new large pulling material has been sent out in the suspension scaffold construction apparatus.
FIG. 7 is a front view showing a state where a flooring is placed in the suspension scaffold construction apparatus.
FIG. 8 is an explanatory diagram of a method for constructing a suspended scaffold by a conventional delivery method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Beam material 2 Flange 3 Guide rail 8 Fixing metal fixture 9 Movable lifting jig 10 Bracket 12 Roller 15 Chain block 16 Hanging hook 17 New large pulling material 18 Towing hook 19 Retraction towing member 20 Advance towing member 21 Pulley 22 Hollow Part 23 Suspended scaffold construction device 24 Existing suspended scaffold 25 Large pulling material 25a Most advanced large pulling material 26 Structure 27 Suspension material 27a Most advanced hanging material 28 joist 29 Floor material 30 Receiving bracket

Claims (5)

構造物より垂下する吊材により支持されて平行に配設される複数の大引材を有する吊り足場を構築する装置であって、前記構造物に固定されるガイドレールに沿って進退自在な可動吊り治具にて新たに設ける大引材を前方に送り出すようにした送出装置が、前記構造物に対して移動自在であり、前記可動吊り治具には、該可動吊り治具を前記ガイドレールに沿って前進させることのできる前進用牽引部材と後退させることのできる後退用牽引部材とが接続されており、このうち前進用牽引部材は前記ガイドレールの先端部に設けた滑車を介して、又後退用索引部材は直に前記ガイドレールの後端部側に延長されていることを特徴とする吊り足場の構築装置。  An apparatus for constructing a suspension scaffold having a plurality of large pulling materials supported in parallel by a suspension member suspended from a structure and movable freely along a guide rail fixed to the structure. A feeding device that feeds a large pulling material newly provided by a hanging jig is movable with respect to the structure. The movable hanging jig is connected to the guide rail. A forward traction member that can be moved forward along with a backward traction member that can be moved backward is connected, and the forward traction member is connected via a pulley provided at the tip of the guide rail, Further, the retracting index member extends directly to the rear end side of the guide rail. 構造物より垂下する吊材により支持されて平行に配設される複数の大引材を有する吊り足場を構築する装置であって、既設吊り足場の最先端に位置する前記吊材の前方に、新たに設ける大引材を仮置きするための受金具を有することを特徴とする請求項1に記載の吊り足場の構築装置。An apparatus for constructing a suspension scaffold having a plurality of large pulling members supported by a suspension member hanging from a structure and arranged in parallel, in front of the suspension member located at the forefront of an existing suspension scaffold, The suspension scaffold construction device according to claim 1, further comprising a receiving bracket for temporarily placing a newly provided large pulling material. 前記ガイドレールは長手方向に沿った中空部を有し、該中空部に前記前進用牽引部材が収容されていることを特徴とする請求項1に記載の吊り足場の構築装置。  The construction apparatus for a suspended scaffold according to claim 1, wherein the guide rail has a hollow portion along a longitudinal direction, and the forward pulling member is accommodated in the hollow portion. 構造物より垂下する吊材により支持されて平行に配設される複数の大引材を有する吊り足場を構築する方法であって、前記構造物に固定されるガイドレールに沿って前進させることのできる前進用牽引部材と後退させることのできる後退用牽引部材とが接続されており、このうち前進用牽引部材は前記ガイドレールの先端部に設けた滑車を介して、又後退用索引部材は直に前記ガイドレールの後端部側に延長されている可動吊り治具を吊り足場の構築装置に取り付け、前記前進用牽引部材を引張ることにより、前記可動吊り治具にて新たに設ける大引材を約1スパン分前方に送り出し、該新たな大引材を吊材にて前記構造物に吊り下げ、その後前記ガイドレールを前記構造物の前方に移動させることで、前方に向かって順次新たな吊り足場を構築していくことを特徴とする吊り足場の構築方法。A method for constructing a suspension scaffold having a plurality of large pulling members supported by a suspension member hanging from a structure and arranged in parallel, wherein the suspension scaffold is advanced along a guide rail fixed to the structure. A forward traction member that can be moved backward and a backward traction member that can be moved backward are connected. The movable suspension jig extended to the rear end side of the guide rail is attached to a construction device for a suspension scaffold, and the forward pulling member is pulled to newly provide a large pulling material provided by the movable suspension jig. Is sent forward by about one span, the new large pulling material is suspended from the structure by a suspension material, and then the guide rail is moved to the front of the structure, so that new ones are sequentially forwarded. Hanging scaffold How to build a hanging scaffold, characterized in that it continue to built. 構造物より垂下する吊材により支持されて平行に配設される複数の大引材を有する吊り足場を構築する方法であって、既設吊り足場の最先端に位置する前記吊材の前方に取り付けた受金具の上で新たに設ける大引材を前記吊り足場の幅に合わせて必要数を連結し、該連結された新たな大引材を前方へ送り出すことで、前方に向かって順次新たな吊り足場を構築していくことを特徴とする請求項4に記載の吊り足場の構築方法。A method for constructing a suspended scaffolding having a plurality of large pulling members supported in parallel by suspension members suspended from a structure and attached in front of the suspension members located at the forefront of an existing suspension scaffold Connect the required number of large pulling materials newly provided on the brackets according to the width of the suspension scaffold, and send the new large pulling materials connected forward, so that a new The method for constructing a suspended scaffold according to claim 4, wherein a suspended scaffold is constructed.
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JP4934755B1 (en) * 2011-11-07 2012-05-16 株式会社石塚組 Scaffolding materials and suspension scaffolds

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JP6368628B2 (en) * 2014-11-18 2018-08-01 首都高速道路株式会社 Mobile scaffold and inspection / repair method using the mobile scaffold
JP6786070B2 (en) * 2017-06-23 2020-11-18 日本橋梁株式会社 Permanent scaffolding installation method for bridge inspection
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