JP3744836B2

JP3744836B2 - Temporary scaffold

Info

Publication number: JP3744836B2
Application number: JP2001300097A
Authority: JP
Inventors: 忠治若槻
Original assignee: Alinco Inc
Current assignee: Alinco Inc
Priority date: 2001-09-28
Filing date: 2001-09-28
Publication date: 2006-02-15
Anticipated expiration: 2021-09-28
Also published as: JP2003105967A

Description

【０００１】
【発明の属する技術分野】
本発明は、建設作業現場で使用される仮設足場に関するもので、更に詳しくは足場板が上下に階層状に設けられ、上下の足場板どうしを梯子でつなぎ且つ各足場板に梯子からの出入口となるハッチを設けると共に、このハッチを開閉する作業床を足場板に枢着してなる架設足場に関する。
【０００２】
【従来の技術及びその課題】
従来、上記のような仮設足場の足場板に設けてあるハッチには、その左右何れかの端部に梯子取付用のブラケットが設けてあって、このブラケットのピン孔に梯子の上端部両側面から夫々突出する梯子取付用係止ピンを突入させることによって、梯子を、この梯子の幅方向が足場板の長手方向と直交する向きに取り付けるようになっている。このように、足場板のハッチに、梯子が足場板の長手方向と直交する向きに取り付けられると、幅の広い足場（足場幅が９００ｍｍ〜１２００ｍｍ程度）が組めない現場では、その梯子の設置された足場板上では、梯子が邪魔になって通行できなくなることがあった。
【０００３】
本発明は、足場板のハッチに梯子を足場板の長手方向及びそれと直交する方向に取り付けることができ、足場の状況に応じて任意の向きに梯子を設置できるようにした仮設足場を提供することを目的とする。
【０００４】
【課題を解決するための手段】
請求項１に係る発明は、足場板１が上下に階層状に設けられ、上下の足場板１どうしを梯子５でつなぎ且つ各足場板１に梯子５からの出入口となるハッチ３を設けると共に、このハッチ３を開閉する作業床４を設けてなる架設足場において、前記ハッチ３の概ね四隅部に梯子取付用ブラケット２４，２４，２５，２５が配設され、これら４個のブラケットは、足場板１の長手方向に沿った左右方向に対向するブラケット２４，２５の対向面間の距離Ａと、前後に対向するブラケット２４，２４及び２５，２５の対向面間の距離Ｂとが略等しく且つその距離Ａ，Ｂが梯子５の横幅Ｗに略等しくなるように設定され、左右に対向するブラケット２４，２５の対向面及び前後に対向するブラケット２４，２４及び２５，２５の対向面には、その対向面間に挿入されて立設される梯子５の両側面から夫々突出する梯子取付用の係止ピン１１，１２が突入可能なピン孔ａ，ｂが夫々配設されてなることを特徴とする。
【０００５】
請求項２は、請求項１に記載の架設足場において、左右何れか一方側で前後に対向するブラケット２４，２４の対向面に配設されたピン孔ｂと、他方側で前後に対向するブラケット２５，２５の対向面に設けられたピン孔ｂとの配設ピッチＰが、梯子５の上端部に設けられた梯子取付用の上段側係止ピン１１と、この上段側係止ピン１１の下方に設けられた下段側係止ピン１２との配設ピッチＱに略等しくなるように設定されてなることを特徴とする。
【０００６】
【発明の実施の形態】
図１は、足場板１が上下に複数階層状に設けられた仮設足場を示したもので、上下の足場板１どうしを梯子５でつなぎ且つ各足場板１に梯子５からの出入口となるハッチ３を設けると共に、このハッチ３を開閉する作業床４を設けている。図２は作業床４が閉鎖位置ある状態を示す足場板１の斜視図であり、図３は作業床４が開放位置ある状態での同足場板１の斜視図、図４は同足場板１の作業床４部分の拡大平面図である。また図５は同足場板１の作業床４部分の拡大底面図、図６は図５の一部拡大図である。
【０００７】
上記足場板１の構造について説明すると、足場板本体２の両端部には、足場用建枠の横材６に係止される係止フック７が突設されており、この足場板本体２の一端部側にハッチ３が設けられると共に、このハッチ３を開閉する作業床４が、足場板１の横断方向に沿って開閉するように足場板１に枢着されている。そして作業床４にはその開閉方向前後に、足場板本体２に対し着脱可能な枢着部８，９が設けられていて、その前後何れか一方の枢着部８又は９を脱出状態に、他方の枢着部９又は８を枢着状態に維持することにより、作業床４が開閉方向前後の何れからも開閉可能に足場板本体２に枢着されるようになっている。図３では、枢着部８が枢着状態、枢着部９が脱出状態となっている。
【０００８】
図１、図３及び図５に示すように、足場板本体２に設けてあるハッチ３の概ね四隅部には、梯子取付用ブラケット２４，２５が配設されている。図８は、ハッチ３内に配設されている４個の梯子取付用ブラケット２４，２４，２５，２５の配置状態を示す。この図８から分かるように、ハッチ３の前後側縁部イ，ロ及び左右側縁部ハ，ニからなる開口周縁のうち、前後側縁部イ，ロの夫々の両端部に、梯子取付用ブラケット２４，２５が取り付けられ、各ブラケット２４，２５には梯子５の両側面から突出する梯子取付用の係止ピン１１，１２（図９及び図１０参照）が突入可能なピン孔ａ，ｂが設けられている。
【０００９】
ハッチ３の開口周縁に配設された４個のブラケット２４，２４，２５，２５は、図８に示すように、左右に対向するブラケット２４，２５の対向面間の距離Ａと、前後に対向するブラケット２４，２４及び２５，２５の対向面間の距離Ｂとが略等しく且つその距離Ａ，Ｂが梯子５の横幅Ｗ（図９参照）に略等しくなるように設定されている。そして、左右に対向するブラケット２４，２５の対向面及び前後に対向するブラケット２４，２４及び２５，２５の対向面には、梯子５の両側面から夫々突出する梯子取付用の係止ピン１１，１２が突入可能なピン孔ａ，ｂが夫々配設されている。
【００１０】
また、上記４個のブラケット２４，２４，２５，２５のうち、左右何れか一方側、例えば図８において左側で前後に対向するブラケット２４，２４の対向面に設けられたピン孔ｂと、他方側、即ち右側で前後に対向するブラケット２５，２５の対向面に設けられたピン孔ｂとの配設ピッチＰが、梯子５の上端部に設けられた梯子取付用の上段側係止ピン１１と、この上段側係止ピン１１の下方に配設された下段側係止ピン１２との配設ピッチＱ（図９参照）に略等しくなるように設定されている。
【００１１】
図９は梯子５の正面図であり、図１０の（Ａ）は図９に示す梯子５の一部拡大正面図、（Ｂ）はその左側面図、（Ｃ）はその平面図である。図９から分かるように、梯子５は、足場板本体２の長さより若干短い長さを有する両側一対の支柱３１，３１に踏杆３２を一定間隔おきに横架してなるもので、各支柱３１の上端部には、その外側面からコイルバネ３３の付勢力で突出する係止ピン１１が設けられ、またこの係止ピン１１の突出位置から下方へＱだけ隔たった位置において同様にその外側面からコイルバネ３３の付勢力で突出する係止ピン１２が設けられている。
【００１２】
各係止ピン１１，１２は、図９の（Ａ）〜（Ｃ）から分かるように、支柱３１とこれに取り付けられたブラケット３４とに貫通されて水平方向にスライド自在に支持されていて、コイルバネ３３によりピン先端部が支柱３１の外側面から突出するように付勢されている。また、この係止ピン１１，１２の内端部は、Ｌ字状に折曲されて操作部１１ａ，１２ａを形成しており、前記ハッチ３内のブラケット２４，２５に梯子５を取り付けたり、又は取り外す際に、この操作部１１ａ，１２ａをコイルバネ３３の付勢力に抗して手前に引くことにより、係止ピン１１，１２の先端部を引っ込めるようになっている。尚、梯子５の上端部側の係止ピン１１とこれの下方側の係止ピン１２とは全く同じ構造である。
【００１３】
作業床４の開閉方向前後に設けられた両枢着部８，９は、同じ構造であって、各枢着部８，９は、図５及び図６から分かるように、足場板本体の長手方向側端部に沿った作業床の前後各端部に、同軸上で互いに独立してスライド自在に配置された一対の枢軸用ロッド１３，１３からなり、両枢軸用ロッド１３，１３は、各ロッド１３の外端部１３ａが作業床４の左右両端から常時突出するようにコイルバネ１４によって付勢されており、しかして両枢軸用ロッド１３，１３の突出端部１３ａ，１３ａが、足場板本体２側に設けられたロッド支持穴１５，１５に（図７参照）夫々突入することによって枢着状態となり、両枢軸用ロッド１３，１３の内端部に夫々設けられた操作用把持部１３ｂ，１３ｂをコイルバネ１４，１４の付勢力に抗して引き寄せることにより、両枢軸用ロッド１３，１３の突出端部１３ａ，１３ａが前記ロッド支持穴１５，１５から夫々脱出して脱出状態となる。
【００１４】
各枢着部８，９を構成する一対の枢軸用ロッド１３，１３の各ロッド１３は、足場板本体２に取り付けられたスライド支持部材１６，１７によってスライド自在に支持されている。そして、各枢軸用ロッド１３の内端部に設けられた操作用把持部１３ｂは、このロッド１３の内端部をコ字状に折り返して形成されたもので、図６に示すように、コ字状折り返し部分の先端部に取着された固定ピン１８とスライド支持部材１６の一端面との間にコイルバネ１４が嵌装され、このコイルバネ１４によって各ロッド１３が各ロッド１３の外端部１３ａが作業床４の左右各端から突出付勢されると共に、その突出長さが、スライド支持部材１６の他端面に当接する固定ピン１９によって制限されるようになっている。
【００１５】
従って、各枢着部８，９を足場板本体２に対して脱出状態にする時は、両枢軸用ロッド１３，１３の操作用把持部１３ｂ，１３ｂを、図６の矢印で示すようにコイルバネ１４，１４の付勢力に抗して引き寄せると、両枢軸用ロッド１３，１３の突出端部１３ａ，１３ａが足場板本体２のロッド支持穴１５，１５から夫々脱出して脱出状態となる。この場合、作業床４を形成する床板４ａには、図６に示すように、両枢軸用ロッド１３，１３の操作用把持部１３ｂ，１３ｂが配設されている部分に指挿入用開口部２０が開口形成されているから、作業床４の表側及び裏側の何れからでも指を挿入させて、操作用把持部１３ｂ，１３ｂを簡単容易に引き寄せ操作することができる。
【００１６】
また、図７の（Ａ）及び（Ｂ）に示すように、各枢軸用ロッド１３の外端部１３ａには夫々係合斜端面２１が形成されていて、前後両枢着部８，９の何れか一方、例えば枢着部８を枢着状態にし、他方の枢着部９を脱出状態にして、作業床４を開放状態から閉鎖する時に、他方の枢着部９を構成する枢軸用ロッド１３の係合斜端面２１を、図７の（Ａ）に示すように足場板本体２側に設けられたロッド支持穴１５の入口部に対しその上方から押し付けることにより、その係合斜端面２１の楔作用で枢軸用ロッド１３が前記コイルバネ１４に抗し引き寄せられて当該ロッド１３の外端部１３ａが同図の（Ｂ）に示すようにロッド支持穴１５に突入し、作業床４を閉鎖位置に自動的にロックするようになっている。
【００１７】
実際の使用に際しては、一方の枢着部８を枢着状態にし、他方の枢着部９を脱出状態にした作業床４を、図３に示すように起立した状態から閉じる方向に押し倒せば、枢着部９側にある両枢軸用ロッド１３，１３の突出端部１３ａ，１３ａがその係合斜端面２１，２１によりロッド支持穴１５，１５に突入して、閉鎖位置に自動的にロックされることになる。尚、各枢軸用ロッド１３の外端部（突出端部）１３ａが突入して支持されるロッド支持穴１５は、図７に示すように、足場板本体２の端部横枠２２の内側凹段部２２ａ所要位置に固定されたナット部材２３に同心状形成された穴からなる。
【００１８】
上記のように構成される仮設足場において、各足場板１に設けられた作業床４の開閉操作について説明すると、図２に示すように作業床４の両枢着部８，９がいずれも枢着状態に維持されて閉鎖位置にある作業床４を、図３に示すように枢着部９側から開放させる際には、この枢着部９側における両枢軸用ロッド１３，１３の操作用把持部１３ｂ，１３ｂを把持して引き寄せると、両枢軸用ロッド１３，１３の突出端部１３ａ，１３ａが足場板本体２側のロッド支持穴１５，１５から脱出するから、この作業床４の枢着部９側を引き起こして図３に示すような起立姿勢にすればよい。この起立姿勢に保持されている作業床４を、閉鎖方向に倒せば、図７によって説明したように、枢着部９側にある両枢軸用ロッド１３，１３の突出端部１３ａ，１３ａがその係合斜端面２１，２１によりロッド支持穴１５，１５に突入して、閉鎖位置に自動的にロックされる。
【００１９】
上記のように閉鎖位置にロックされている作業床４を、今度は、図３に示す場合とは反対側の枢着部８側から開放させる時には、この枢着部８側における両枢軸用ロッド１３，１３の操作用把持部１３ｂ，１３ｂを把持して引き寄せると、前記同様に、両枢軸用ロッド１３，１３の突出端部１３ａ，１３ａが足場板本体２側のロッド支持穴１５，１５から脱出するから、この作業床４の枢着部８側を引き起こして、前記同様に起立姿勢にすればよい。
【００２０】
また、作業床４をハッチ３から取り外す場合には、作業床４の一方側にある枢着部８の枢軸用ロッド１３，１３の操作用把持部１３ｂ，１３ｂと、他方側にある枢着部８の枢軸用ロッド１３，１３の操作用把持部１３ｂ，１３ｂとを同時に把持すれば、両方の枢着部８，９が足場板本体２に対して脱出状態となるから、そのまま引き上げることによって、作業床４をハッチ３から簡単容易に取り外しことができる。
【００２１】
次に、図１に示すような仮設足場において、上下の足場板１どうしを梯子５でつなぐ際のハッチ３内での梯子５の取付方法、及び梯子５を足場板１の裏側に収納する方法について、図１１〜図１５を参照して説明する。
【００２２】
図１１は、図１に示す仮設足場の中段側足場板１と下段側足場板１とをつなぐ梯子５のように、梯子５を、その幅方向が足場板１の長手方向と直交する向きで、且つハッチ３の開口周縁の右側縁部ニに沿って取り付ける場合を示すもので、この場合は、図８にも示すように、ハッチ３内の右端側で前後に対向する２個のブラケット２５，２５間の対向するピン孔ｂ，ｂに沿った位置▲４▼（図８参照）に梯子５の上端部側を挿入し、この梯子５の両側面から突出する係止ピン１１，１１を両ブラケット２５，２５のピン孔ｂ，ｂに突入させればよい。
【００２３】
図示は省略するが、梯子５をハッチ３の開口周縁の左側縁部ハに沿って取り付ける時は、ハッチ３内の左端側で前後に対向する２個のブラケット２４，２４間の対向するピン孔ｂ，ｂに沿った位置▲３▼（図８参照）に梯子５の上端部側を挿入し、梯子５の両側面から突出する係止ピン１１，１１を両ブラケット２４，２４，９のピン孔ｂ，ｂに突入させる。
【００２４】
図１２は、図１に示す仮設足場の上段側足場板１と中段側足場板１とをつなぐ梯子５のように、梯子５を、その幅方向が足場板１の長手方向と平行する向きで、且つハッチ３の開口周縁の後側縁部ロに沿って取り付ける場合を示すもので、この場合は、ハッチ３の開口周縁の後側縁部ロに沿ってその左右両端部にある２個のブラケット２４，２５間の対向するピン孔ａ，ａに沿った位置▲２▼（図８参照）に梯子５の上端部側を挿入し、この梯子５の両側面から突出する係止ピン１１，１１を両ブラケット２４，２５のピン孔ａ，ａに突入させればよい。
【００２５】
また図示は省略するが、ハッチ３の開口周縁の前側縁部イに沿って取り付ける場合は、その前側縁部イに沿ってその左右両端部にある２個のブラケット２４，２５間の対向するピン孔ａ，ａに沿った位置▲１▼（図８参照）に梯子５の上端部側を挿入し、梯子５の両側面から突出する係止ピン１１，１１を両ブラケット２４，２５のピン孔ａ，ａに突入させるようにする。
【００２６】
上記した図１２に示す取付例のように、ハッチ３の開口周縁の前側縁部イあるいは後側縁部ロに沿った位置に梯子５を取り付けることができて、梯子５を、その幅方向が足場板１の長手方向と平行するように設置できるから、幅の狭い（足場幅が５００ｍｍ程度）足場しか組めない現場でも、その梯子５の設置された下段側の足場板１上での通行が可能となる。尚、図１４は、ハッチ３内の前側縁部イあるいは後側縁部ロに沿った位置に梯子５を取り付けた場合の仮設足場の縦断面図である。この図からも、梯子５の設置された下段側の足場板１上を通行できることが分かる。
【００２７】
図１３は、梯子５を収納する場合を示している。即ち、図８にも示すように、ハッチ３内の左端側で前後に対向するブラケット２４，２４の対向面に設けられたピン孔ｂと、ハッチ３内の右端側で前後に対向するブラケット２５，２５の対向面に設けられたピン孔ｂとの配設ピッチＰが、梯子取付用の上段側係止ピン１１と、下段側係止ピン１２との配設ピッチＱ（図９参照）に略等しくなるように設定されていることから、先ず、ハッチ３内の右端側で前後に対向する２個のブラケット２５，２５間の対向するピン孔ｂ，ｂに沿った位置▲４▼（図８参照）に梯子５の上端部側を挿入して、梯子５の両側面から突出する係止ピン１１，１１を両ブラケット２５，２５のピン孔ｂ，ｂに突入させることにより、梯子５の上端部を上記両ブラケット２５，２５に枢着する。
【００２８】
この後、その梯子５を、図１５の（Ａ）に示すように係止ピン１１，１１を中心に上向きに揺動旋回させて足場板１の裏面側に当接させた状態とし、この状態で、ハッチ３内の左端側で前後に対向する２個のブラケット２４，２４間の対向するピン孔ｂ，ｂに、梯子５の下段側にある係止ピン１２，１２を突入させる。これによって、梯子５は、足場板１の裏側に収納された状態となり、この収納状態を図１５の（Ｂ）に示す。尚、ハッチ３の開口周縁の右側縁部ニに沿った位置には、足場板本体２の端部横枠２２（図７参照）が配設されているが、左側縁部ハに沿った位置には、上記端部横枠２２のような横枠が配設されていないので、梯子５は、足場板１の裏面に重合した状態で収納されるようになる。
【００２９】
上記のように梯子５を足場板１の裏側に簡単に収納させることができるから、梯子５を収納しておくことによって、足場板１及び梯子５の運搬に便利となる。また、梯子５を使用しない場合は、この梯子５の収納された足場板１の下段側の足場板１上での通行が可能となる。
【００３０】
以上説明したように、本発明に係る仮設足場では、ハッチ３の概ね四隅部に設けた４個の梯子取付用ブラケット２４，２４，２５，２５が、ハッチ３内において左右に対向するブラケット２４，２５の対向面間の距離Ａと、前後に対向するブラケット２４，２４及び２５，２５の対向面間の距離Ｂとが略等しく且つその距離Ａ，Ｂが梯子５の横幅Ｗに略等しくなるように設定され、そして左右に対向するブラケット２４，２５の対向面及び前後に対向するブラケット２４，２４及び２５，２５の夫々の対向面に、梯子５の両側面から夫々突出する梯子取付用の係止ピン１１，１２が突入可能なピン孔ａ，ｂが夫々配設されているから、ハッチ３に梯子５を取り付けるにあたって、ハッチの前後側縁部イ，ロ及び左右側縁部ハ，ニの何れの位置にも取り付けることができる。従って、足場幅が５００ｍｍ程度の幅の狭い足場しか組めない仮設足場にあっても、梯子の設置された下段側の足場板上での通行が可能となる。
【００３１】
また、ハッチ３内の左端側で前後に対向するブラケット２４，２４の対向面に設けられたピン孔ｂと、ハッチ３内の右端側で前後に対向するブラケット２５，２５の対向面に設けられたピン孔ｂとの配設ピッチＰが、梯子の上段側係止ピン１１と下段側係止ピン１２との配設ピッチＱに略等しくなるように設定されているから、ハッチ３内の右端側で前後に対向する２個のブラケット２５，２５間のピン孔ｂ，ｂに沿った位置▲４▼（図８参照）に梯子５の上端部側を挿入すると共に、ハッチ３内の左端側で前後に対向する２個のブラケット２４，２４間の対向するピン孔ｂ，ｂに、梯子５の下段側係止ピン１２，１２を突入させることによって、梯子５を足場板１の裏側に簡単に収納させることができ、足場板１及び梯子５の運搬や保管に便利となる。
【００３２】
以上の実施形態では、４個の梯子取付用ブラケット２４，２４，２５，２５を、ハッチ３内における前後側縁部イ，ロの夫々両端部に配設しているが、左右側縁部ハ，ニの夫々両端部に配設してもよく、更には四隅部に配設してもよい。
【００３３】
【発明の効果】
請求項１に係る発明によれば、ハッチに梯子を取り付けるにあたって、梯子をハッチの前後側縁部及び左右側縁部の何れの位置にも取り付けることができから、足場の状況に応じて任意の向きに梯子を設置することができる。特に、幅の狭い足場しか組めない仮設足場にあっても、梯子の設置された下段側の足場板上での通行が可能となる。
【００３４】
請求項２に係る発明によれば、梯子を足場板の裏側に収納させることができ、足場板及び梯子の運搬や保管に便利となる。
【図面の簡単な説明】
【図１】足場板が上下に複数階層状に設けられた仮設足場を示す斜視図である。
【図２】作業床が閉鎖位置ある状態を示す足場板の斜視図である。
【図３】作業床が開放位置ある状態での同足場板の斜視図である。
【図４】同足場板の作業床部分の拡大平面図である。
【図５】同足場板の作業床部分の拡大底面図である。
【図６】図５の一部拡大図である。
【図７】（Ａ）は係合斜端面を形成した枢軸用ロッドの突出端部がロッド支持穴に突入する前段階を示す説明断面図、（Ｂ）は同枢軸用ロッドの突出端部が係合斜端面によりロッド支持穴に突入した状態示す説明断面図である。
【図８】ハッチ内に配設されている４個の梯子取付用ブラケットの配置状態を示す説明斜視図である。
【図９】梯子の正面図である。
【図１０】（Ａ）は図９に示す梯子の一部拡大正面図、（Ｂ）はその左側面図、（Ｃ）はその平面図である。
【図１１】ブラケットへの梯子の取付状態を示す説明斜視図である。
【図１２】ブラケットへの梯子の取付状態を示す説明斜視図である。
【図１３】梯子収納時におけるブラケットへの梯子の取付状態を示す説明斜視図である。
【図１４】ハッチ内の前側縁部あるいは後側縁部に沿った位置に梯子を取り付けた場合の仮設足場の縦断面図である。
【図１５】（Ａ）は足場板の裏側に梯子を収納している方法を示す側面図、（Ｂ）は梯子を収納した状態での足場板の底面図である。
【符号の説明】
１足場板
２足場板本体
３ハッチ
４作業床
５梯子
１１，１２梯子取付用の係止ピン
２４，２５梯子取付用ブラケット
ａ，ｂピン孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a temporary scaffold used at a construction work site, and more specifically, scaffolding plates are provided in a hierarchical manner in the vertical direction, the upper and lower scaffolding plates are connected by a ladder, and the entrance and exit from the ladder are connected to each scaffolding plate. In addition, the present invention relates to an erected scaffold in which a work floor for opening and closing the hatch is pivotally attached to a scaffold plate.
[0002]
[Prior art and problems]
Conventionally, the hatch provided on the scaffolding plate of the temporary scaffold as described above is provided with a bracket for mounting the ladder at either the left or right end, and both sides of the upper end of the ladder at the pin hole of this bracket. The ladder is locked in such a manner that the ladder is inserted in such a direction that the width direction of the ladder is perpendicular to the longitudinal direction of the scaffolding plate. In this way, when the ladder is attached to the scaffold plate hatch in a direction perpendicular to the longitudinal direction of the scaffold plate, the ladder is installed at a site where a wide scaffold (scaffold width of about 900 mm to 1200 mm) cannot be assembled. On the scaffolding board, the ladder could get in the way and make it impossible to pass.
[0003]
The present invention provides a temporary scaffold in which a ladder can be attached to the hatch of the scaffold board in the longitudinal direction of the scaffold board and a direction orthogonal thereto, and the ladder can be installed in any direction depending on the situation of the scaffold. With the goal.
[0004]
[Means for Solving the Problems]
In the invention according to claim 1, the scaffolding plates 1 are provided in a hierarchy in the vertical direction, the upper and lower scaffolding plates 1 are connected by a ladder 5, and each scaffolding plate 1 is provided with a hatch 3 serving as an entrance from the ladder 5, In the erected scaffolding provided with the work floor 4 for opening and closing the hatch 3, ladder mounting brackets 24, 24, 25, 25 are disposed at substantially four corners of the hatch 3, and these four brackets are used as scaffolding plates. The distance A between the opposing surfaces of the brackets 24, 25 facing in the left-right direction along the longitudinal direction of 1 is substantially equal to the distance B between the opposing surfaces of the brackets 24, 24 and 25, 25 facing in the front-rear direction. The distances A and B are set so as to be substantially equal to the lateral width W of the ladder 5. The opposing surfaces of the brackets 24 and 25 facing left and right and the opposing surfaces of the brackets 24, 24 and 25 and 25 facing front and rear are Opposite Engaging pins 11, 12 can rush pin holes a for ladders attached to each protruding from both sides of the inserted ladder 5 erected between, b is characterized by comprising a respectively disposed.
[0005]
Claim 2 is the mounting scaffold according to claim 1, wherein the pin holes b disposed on the opposing surfaces of the brackets 24, 24 facing front and rear on either the left and right sides, and the brackets facing front and rear on the other side The pitch P between the pin holes b provided on the opposing surfaces of 25 and 25 is such that the ladder mounting upper locking pin 11 provided at the upper end of the ladder 5 and the upper locking pin 11 It is characterized in that it is set to be substantially equal to the arrangement pitch Q with the lower stage side locking pin 12 provided below.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a temporary scaffold in which scaffolding plates 1 are provided in a plurality of layers in the vertical direction. A hatch that connects the upper and lower scaffolding plates 1 with a ladder 5 and serves as an entrance from the ladder 5 to each scaffolding plate 1. 3 and a work floor 4 for opening and closing the hatch 3 is provided. 2 is a perspective view of the scaffold board 1 showing a state in which the work floor 4 is in the closed position, FIG. 3 is a perspective view of the scaffold board 1 in a state in which the work floor 4 is in the open position, and FIG. It is an enlarged plan view of 4 working floors. 5 is an enlarged bottom view of the work floor 4 portion of the scaffold board 1, and FIG. 6 is a partially enlarged view of FIG.
[0007]
The structure of the scaffold board 1 will be described. At both ends of the scaffold board main body 2, locking hooks 7 that are latched to the transverse members 6 of the scaffold for building frames are projected. A hatch 3 is provided on one end side, and a work floor 4 for opening and closing the hatch 3 is pivotally attached to the scaffold plate 1 so as to open and close along the transverse direction of the scaffold plate 1. And the working floor 4 is provided with pivoting portions 8 and 9 that can be attached to and detached from the scaffolding plate body 2 before and after the opening and closing direction, and either the pivoting portion 8 or 9 before and after that is in an escaped state. By maintaining the other pivotally attached portion 9 or 8 in the pivoted state, the work floor 4 is pivotally attached to the scaffold plate body 2 so as to be opened and closed from either before or after the opening and closing direction. In FIG. 3, the pivoting portion 8 is pivoted and the pivoting portion 9 is in an escaped state.
[0008]
As shown in FIGS. 1, 3, and 5, ladder mounting brackets 24 and 25 are provided at approximately four corners of the hatch 3 provided on the scaffolding plate body 2. FIG. 8 shows an arrangement state of the four ladder mounting brackets 24, 24, 25, 25 arranged in the hatch 3. As can be seen from FIG. 8, among the opening peripheral edges of the front and rear side edges a and b of the hatch 3 and the left and right side edges c and d, both ends of the front and rear side edges a and b are attached to ladders. Brackets 24 and 25 are attached to the brackets 24 and 25, and pin holes a and b through which ladder mounting locking pins 11 and 12 (see FIGS. 9 and 10) protruding from both side surfaces of the ladder 5 can be inserted. Is provided.
[0009]
As shown in FIG. 8, the four brackets 24, 24, 25, 25 arranged on the opening periphery of the hatch 3 are opposed to the distance A between the opposed surfaces of the brackets 24, 25 facing left and right and to the front and rear. The distance B between the opposed surfaces of the brackets 24, 24 and 25, 25 is set to be substantially equal and the distances A, B are set to be substantially equal to the lateral width W of the ladder 5 (see FIG. 9). Further, on the opposing surfaces of the brackets 24, 25 facing left and right and the opposing surfaces of the brackets 24, 24 and 25, 25 facing front and rear, the locking pins 11 for attaching the ladder protruding from both side surfaces of the ladder 5, respectively. Pin holes a and b into which 12 can enter are respectively provided.
[0010]
Further, of the four brackets 24, 24, 25, 25, the pin hole b provided on the opposing surface of the brackets 24, 24 facing the front and rear on the left or right side, for example, the left side in FIG. An arrangement pitch P with the pin holes b provided on the opposing surfaces of the brackets 25, 25 facing front and rear on the side, that is, on the right side, is an upper stage locking pin 11 for attaching a ladder provided at the upper end of the ladder 5. And an arrangement pitch Q (see FIG. 9) between the upper stage side latching pins 11 and the lower stage side latching pins 12 arranged below the upper stage side latching pins 11.
[0011]
9 is a front view of the ladder 5, FIG. 10A is a partially enlarged front view of the ladder 5 shown in FIG. 9, FIG. 9B is a left side view thereof, and FIG. As can be seen from FIG. 9, the ladder 5 is formed by horizontally placing a spade 32 at a predetermined interval on a pair of both sides 31, 31 having a length slightly shorter than the length of the scaffold plate body 2. The upper end of 31 is provided with a locking pin 11 that protrudes from the outer surface thereof by the biasing force of the coil spring 33, and the outer surface similarly at a position spaced Q from the protruding position of the locking pin 11 downward. A locking pin 12 that protrudes by the biasing force of the coil spring 33 is provided.
[0012]
As can be seen from (A) to (C) of FIG. 9, each of the locking pins 11 and 12 is supported so as to be slidable in the horizontal direction through the support post 31 and the bracket 34 attached thereto. The tip of the pin is urged by the coil spring 33 so as to protrude from the outer surface of the column 31. The inner ends of the locking pins 11 and 12 are bent in an L shape to form operation portions 11a and 12a. The ladder 5 is attached to the brackets 24 and 25 in the hatch 3, Alternatively, when removing, the operation portions 11a and 12a are pulled toward the front against the urging force of the coil spring 33, whereby the tip portions of the locking pins 11 and 12 are retracted. Note that the locking pin 11 on the upper end side of the ladder 5 and the locking pin 12 on the lower side have the same structure.
[0013]
Both pivoting portions 8 and 9 provided in the front and rear direction of the work floor 4 have the same structure, and each pivoting portion 8 and 9 is the longitudinal direction of the scaffold plate body as can be seen from FIGS. It consists of a pair of pivot rods 13 and 13 which are coaxially and slidably arranged on the front and rear ends of the work floor along the direction side end, respectively. The outer end 13a of the rod 13 is urged by the coil spring 14 so that it always protrudes from the left and right ends of the work floor 4, and the protruding ends 13a, 13a of the pivot rods 13, 13 are the scaffold plate body. 2 are inserted into the rod support holes 15 and 15 provided on the second side (see FIG. 7), respectively, so that they are pivotally attached, and the operation gripping portions 13b provided at the inner ends of the pivot shafts 13 and 13, respectively. 13b against the urging force of the coil springs 14 and 14 By lapping come, the projecting end portions 13a of both the pivot rods 13, 13, 13a is escaped state to each exit from the rod support holes 15 and 15.
[0014]
The rods 13 of the pair of pivot rods 13 and 13 constituting the pivot attachment portions 8 and 9 are slidably supported by slide support members 16 and 17 attached to the scaffold plate body 2. The operation gripping portion 13b provided at the inner end of each pivot rod 13 is formed by folding the inner end of the rod 13 into a U-shape. As shown in FIG. A coil spring 14 is fitted between the fixed pin 18 attached to the tip of the folded portion and the one end surface of the slide support member 16, and the coil spring 14 causes each rod 13 to be connected to the outer end portion 13 a of each rod 13. Are projected and urged from the left and right ends of the work floor 4, and the length of the projection is limited by a fixing pin 19 that contacts the other end surface of the slide support member 16.
[0015]
Therefore, when the pivoting portions 8 and 9 are brought into the escape state with respect to the scaffold plate body 2, the operation gripping portions 13b and 13b of the pivot shaft rods 13 and 13 are coil springs as shown by arrows in FIG. When pulled against the urging force of 14, 14, the projecting ends 13 a, 13 a of the pivot shaft rods 13, 13 escape from the rod support holes 15, 15 of the scaffold plate body 2, respectively, and enter an escaped state. In this case, as shown in FIG. 6, the floor plate 4a forming the work floor 4 has a finger insertion opening 20 at a portion where the operation gripping portions 13b and 13b of the pivot shafts 13 and 13 are disposed. Since the opening is formed, the fingers can be inserted from either the front side or the back side of the work floor 4 and the operation gripping portions 13b, 13b can be easily pulled and operated.
[0016]
Further, as shown in FIGS. 7A and 7B, the outer end portion 13a of each pivot rod 13 is formed with an engaging oblique end surface 21, respectively. Any one, for example, when the pivoting portion 8 is pivoted, the other pivoting portion 9 is in the escaped state, and the work floor 4 is closed from the open state, the pivot rod constituting the other pivoting portion 9 As shown in FIG. 7 (A), the engaging oblique end surface 21 of 13 is pressed against the entrance portion of the rod support hole 15 provided on the scaffolding plate body 2 side from above, thereby engaging the oblique inclined end surface 21. As a result of the wedge action, the pivot rod 13 is pulled against the coil spring 14, and the outer end 13a of the rod 13 enters the rod support hole 15 as shown in FIG. It automatically locks into position.
[0017]
In actual use, if one of the pivoting portions 8 is pivoted and the working floor 4 with the other pivoting portion 9 in the escaped state is pushed down from the standing state to the closing direction as shown in FIG. The projecting end portions 13a, 13a of the pivot rods 13, 13 on the side of the pivoting portion 9 enter the rod support holes 15, 15 by their engaging oblique end surfaces 21, 21, and are automatically locked in the closed position. Will be. In addition, the rod support hole 15 into which the outer end portion (projecting end portion) 13a of each pivot rod 13 is inserted and supported is formed in the inner concave portion of the end portion lateral frame 22 of the scaffold plate body 2 as shown in FIG. The step portion 22a is formed of a hole concentrically formed in the nut member 23 fixed at a required position.
[0018]
In the temporary scaffold constructed as described above, the opening / closing operation of the work floor 4 provided on each scaffold plate 1 will be described. As shown in FIG. 2, both pivoting portions 8 and 9 of the work floor 4 are pivoted. When the work floor 4 maintained in the wearing state and in the closed position is opened from the pivoting portion 9 as shown in FIG. 3, the pivot rods 13 and 13 are operated on the pivoting portion 9 side. When the gripping portions 13b and 13b are gripped and pulled, the protruding end portions 13a and 13a of the pivot shaft rods 13 and 13 escape from the rod support holes 15 and 15 on the scaffold plate body 2 side. What is necessary is just to raise the landing part 9 side and to take the standing posture as shown in FIG. When the work floor 4 held in this standing posture is tilted in the closing direction, as described with reference to FIG. 7, the projecting end portions 13a and 13a of the pivot shafts 13 and 13 on the pivot attachment portion 9 side are The rods 15 and 15 enter the rod support holes 15 and 15 by the engaging oblique end surfaces 21 and 21 and are automatically locked in the closed position.
[0019]
When the work floor 4 locked in the closed position as described above is opened from the pivoting portion 8 side opposite to the case shown in FIG. 3, the pivot rods on the pivoting portion 8 side are opened. When the gripping portions 13b and 13b for operation 13 and 13 are gripped and pulled, the protruding end portions 13a and 13a of the pivot shafts 13 and 13 are pulled out from the rod support holes 15 and 15 on the scaffolding plate main body 2 side as described above. Since it escapes, the pivoting part 8 side of this work floor 4 is raised, and it should just be in a standing posture like the above.
[0020]
When the work floor 4 is removed from the hatch 3, the operation gripping portions 13 b and 13 b of the pivot rods 13 and 13 of the pivot joint 8 on one side of the work floor 4 and the pivot joint on the other side. If the gripping portions 13b and 13b for operation of the eight pivot rods 13 and 13 are simultaneously gripped, both pivotal attachment portions 8 and 9 are in an escaped state with respect to the scaffold plate body 2, The work floor 4 can be easily and easily detached from the hatch 3.
[0021]
Next, in the temporary scaffold as shown in FIG. 1, a method of attaching the ladder 5 in the hatch 3 when the upper and lower scaffold plates 1 are connected by the ladder 5, and a method of storing the ladder 5 on the back side of the scaffold plate 1. Will be described with reference to FIGS.
[0022]
FIG. 11 shows a ladder 5 in a direction in which the width direction is perpendicular to the longitudinal direction of the scaffold board 1, like a ladder 5 that connects the middle stage scaffold board 1 and the lower stage scaffold board 1 of the temporary scaffold shown in FIG. 1. In this case, as shown in FIG. 8, two brackets 25 facing front and rear on the right end side of the hatch 3 are shown. , 25 along the opposing pin holes b, b (4) (see FIG. 8), the upper end portion side of the ladder 5 is inserted, and the locking pins 11, 11 protruding from both side surfaces of the ladder 5 are inserted. What is necessary is just to enter the pin holes b of both brackets 25 and 25.
[0023]
Although not shown in the drawings, when the ladder 5 is attached along the left edge of the opening edge of the hatch 3, the opposing pin holes between the two brackets 24, 24 facing forward and backward on the left end side in the hatch 3. The upper end side of the ladder 5 is inserted into position {circle around (3)} (see FIG. 8) along b, b, and the locking pins 11, 11 protruding from both side surfaces of the ladder 5 are the pins of the brackets 24, 24, 9. It penetrates into the holes b and b.
[0024]
FIG. 12 shows the ladder 5 in a direction in which the width direction thereof is parallel to the longitudinal direction of the scaffold board 1, like the ladder 5 that connects the upper stage scaffold board 1 and the middle stage scaffold board 1 of the temporary scaffold shown in FIG. 1. , And the case where the hatch 3 is attached along the rear edge b of the opening edge of the hatch 3, and in this case, the two left and right ends of the hatch 3 along the rear edge b of the opening edge of the hatch 3 are shown. The upper end portion side of the ladder 5 is inserted into the position {circle around (2)} (see FIG. 8) along the opposing pin holes a, a between the brackets 24, 25, and the locking pins 11 projecting from both side surfaces of the ladder 5, 11 may be inserted into the pin holes a and a of both brackets 24 and 25.
[0025]
Although not shown, when mounting along the front edge i of the opening edge of the hatch 3, the opposing pins between the two brackets 24, 25 at the left and right ends along the front edge i The upper end portion side of the ladder 5 is inserted into the position {circle around (1)} (see FIG. 8) along the holes a and a, and the locking pins 11 and 11 protruding from both side surfaces of the ladder 5 are pin holes of both brackets 24 and 25. Let it rush into a and a.
[0026]
As shown in the attachment example shown in FIG. 12 described above, the ladder 5 can be attached at a position along the front edge b or rear edge b of the opening edge of the hatch 3. Since it can be installed so as to be parallel to the longitudinal direction of the scaffolding board 1, even on a site where only a scaffold with a small width (the scaffolding width is about 500 mm) can be assembled, traffic on the lower scaffolding board 1 where the ladder 5 is installed It becomes possible. FIG. 14 is a vertical cross-sectional view of the temporary scaffold when the ladder 5 is attached at a position along the front edge b or rear edge b in the hatch 3. Also from this figure, it can be seen that the vehicle can pass on the lower scaffolding plate 1 on which the ladder 5 is installed.
[0027]
FIG. 13 shows a case where the ladder 5 is stored. That is, as shown also in FIG. 8, the pin hole b provided in the opposing surface of the brackets 24 and 24 facing back and forth on the left end side in the hatch 3 and the bracket 25 facing back and forth on the right end side in the hatch 3. 25, the pitch P of arrangement with the pin holes b provided on the opposing surfaces of 25, 25 is the pitch Q of arrangement of the upper locking pins 11 and the lower locking pins 12 for attaching the ladder (see FIG. 9). Since they are set so as to be substantially equal, first, the position {circle around (4)} of the two brackets 25, 25 facing each other on the right end side in the hatch 3 along the opposing pin holes b, b. 8), the upper end portion side of the ladder 5 is inserted, and the locking pins 11, 11 protruding from both side surfaces of the ladder 5 are inserted into the pin holes b, b of both brackets 25, 25, so that the ladder 5 The upper end is pivotally attached to the brackets 25 and 25.
[0028]
Thereafter, as shown in FIG. 15 (A), the ladder 5 is swung upwardly around the locking pins 11 and 11 and brought into contact with the back surface side of the scaffold plate 1. Thus, the locking pins 12 and 12 on the lower side of the ladder 5 are inserted into the pin holes b and b facing each other between the two brackets 24 and 24 facing front and rear on the left end side in the hatch 3. As a result, the ladder 5 is housed in the back side of the scaffolding plate 1 and this housed state is shown in FIG. In addition, although the edge part horizontal frame 22 (refer FIG. 7) of the scaffolding board main body 2 is arrange | positioned in the position along the right edge part D of the opening periphery of the hatch 3, the position along left edge part HA Since the horizontal frame such as the end horizontal frame 22 is not disposed, the ladder 5 is accommodated in a state of being superimposed on the back surface of the scaffold plate 1.
[0029]
Since the ladder 5 can be easily stored behind the scaffolding plate 1 as described above, storing the ladder 5 is convenient for transporting the scaffolding plate 1 and the ladder 5. Further, when the ladder 5 is not used, it is possible to pass on the scaffold plate 1 on the lower side of the scaffold plate 1 in which the ladder 5 is stored.
[0030]
As described above, in the temporary scaffold according to the present invention, the four ladder mounting brackets 24, 24, 25, 25 provided at substantially the four corners of the hatch 3 are arranged in the brackets 24, which are opposed to the left and right in the hatch 3. 25 so that the distance A between the opposing faces of the 25 and the distance B between the opposing faces of the brackets 24, 24 and 25, 25 facing forward and backward are substantially equal and the distances A, B are substantially equal to the lateral width W of the ladder 5. And a ladder mounting member that protrudes from both sides of the ladder 5 on the opposing surfaces of the brackets 24, 25 facing left and right and the opposing surfaces of the brackets 24, 24 and 25, 25 facing front and rear. Since the pin holes a and b into which the stop pins 11 and 12 can be inserted are respectively arranged, when attaching the ladder 5 to the hatch 3, the front and rear side edges a and b and the left and right side edges c and d of the hatch Any position You can also attach. Therefore, even if the scaffold is a temporary scaffold that can be assembled only with a narrow scaffold having a width of about 500 mm, it is possible to pass on the scaffold plate on the lower stage where the ladder is installed.
[0031]
Further, the pin hole b provided in the opposing surface of the brackets 24, 24 facing the front and rear on the left end side in the hatch 3 and the opposing surface of the brackets 25, 25 facing the front and rear on the right end side in the hatch 3 are provided. Since the arrangement pitch P with the pin hole b is set to be substantially equal to the arrangement pitch Q between the upper stage side latching pin 11 and the lower stage side latching pin 12 of the ladder, The upper end side of the ladder 5 is inserted into the position {circle around (4)} (see FIG. 8) along the pin holes b between the two brackets 25, 25 facing forward and backward on the side, and the left end side in the hatch 3 The ladder 5 can be easily placed on the back side of the scaffolding plate 1 by inserting the lower-stage locking pins 12 and 12 of the ladder 5 into the opposed pin holes b and b between the two brackets 24 and 24 opposed to each other in the front-rear direction. For transporting and storing scaffolding board 1 and ladder 5 The interest.
[0032]
In the above embodiment, the four ladder mounting brackets 24, 24, 25, 25 are disposed at both ends of the front and rear side edges a and b in the hatch 3. , D may be disposed at both ends, and further may be disposed at the four corners.
[0033]
【The invention's effect】
According to the first aspect of the invention, when attaching the ladder to the hatch, the ladder can be attached to any position of the front and rear side edges and the left and right side edges of the hatch. Ladder can be installed in the direction. In particular, even in a temporary scaffolding where only a narrow scaffolding can be assembled, it is possible to pass on the scaffolding plate on the lower stage where the ladder is installed.
[0034]
According to the invention which concerns on Claim 2, a ladder can be accommodated in the back side of a scaffold board, and it becomes convenient for conveyance and storage of a scaffold board and a ladder.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a temporary scaffold in which scaffold plates are provided in a plurality of layers in the vertical direction.
FIG. 2 is a perspective view of a scaffolding plate showing a state where a work floor is in a closed position.
FIG. 3 is a perspective view of the scaffold board in a state where the work floor is in an open position.
FIG. 4 is an enlarged plan view of a work floor portion of the scaffold board.
FIG. 5 is an enlarged bottom view of a work floor portion of the scaffold board.
6 is a partially enlarged view of FIG. 5;
7A is an explanatory cross-sectional view showing a stage before the protruding end portion of the pivot rod in which the engaging oblique end surface is formed enters the rod support hole, and FIG. 7B is a sectional view showing the protruding end portion of the pivot rod. It is explanatory sectional drawing which shows the state which penetrated into the rod support hole by the engagement oblique end surface.
FIG. 8 is an explanatory perspective view showing an arrangement state of four ladder mounting brackets arranged in the hatch.
FIG. 9 is a front view of a ladder.
10A is a partially enlarged front view of the ladder shown in FIG. 9, FIG. 10B is a left side view thereof, and FIG. 10C is a plan view thereof.
FIG. 11 is an explanatory perspective view showing a state where the ladder is attached to the bracket.
FIG. 12 is an explanatory perspective view showing a mounting state of the ladder to the bracket.
FIG. 13 is an explanatory perspective view showing an attachment state of the ladder to the bracket when the ladder is stored.
FIG. 14 is a longitudinal sectional view of a temporary scaffold when a ladder is attached at a position along a front edge or a rear edge in a hatch.
15A is a side view showing a method of storing a ladder on the back side of the scaffold board, and FIG. 15B is a bottom view of the scaffold board in a state where the ladder is stored.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Scaffold board 2 Scaffold board main body 3 Hatch 4 Work floor 5 Ladder 11 and 12 Ladder mounting locking pins 24 and 25 Ladder mounting brackets a and b Pin holes

Claims

足場板が上下に階層状に設けられ、上下の足場板どうしを梯子でつなぎ且つ各足場板に梯子からの出入口となるハッチを設けると共に、このハッチを開閉する作業床を設けてなる架設足場において、前記ハッチの概ね四隅部に梯子取付用ブラケットが配設され、これら４個のブラケットは、足場板の長手方向に沿った左右方向に対向するブラケットの対向面間の距離と、前後に対向するブラケットの対向面間の距離とが略等しく且つその距離が梯子の横幅に略等しくなるように設定され、左右に対向するブラケットの対向面及び前後に対向するブラケットの対向面には、その対向面間に挿入されて立設される梯子の両側面から夫々突出する梯子取付用の係止ピンが突入可能なピン孔が夫々配設されてなる架設足場。In a scaffolding structure in which scaffolding plates are provided in a hierarchy in the vertical direction, the upper and lower scaffolding plates are connected by ladders, and hatches that serve as entrances and exits from the ladders are provided on each scaffolding plate, and work floors that open and close the hatches are provided. Ladder mounting brackets are arranged at approximately four corners of the hatch, and these four brackets oppose the distance between the opposing surfaces of the brackets facing in the left-right direction along the longitudinal direction of the scaffolding plate and the front and rear. The distance between the opposing faces of the brackets is set to be substantially equal and the distance is substantially equal to the lateral width of the ladder. The opposing faces of the brackets facing left and right and the opposing faces of the brackets facing front and rear are A erected scaffolding comprising pin holes into which ladder mounting locking pins respectively protruding from both side surfaces of a ladder inserted between and standing up can be inserted.

左右何れか一方側で前後に対向するブラケットの対向面に配設されたピン孔と、他方側で前後に対向するブラケットの対向面に設けられたピン孔との配設ピッチが、梯子の上端部に設けられた梯子取付用の上段側係止ピンと、この上段側係止ピンの下方に設けられた下段側係止ピンとの配設ピッチに略等しくなるように設定されてなる請求項１に記載の架設足場。The pitch between the pin holes arranged on the opposing surface of the bracket facing forward and backward on either the left or right side and the pin holes provided on the opposing surface of the bracket facing forward or backward on the other side is the upper end of the ladder 2. The apparatus according to claim 1, wherein the pitch is set to be substantially equal to an arrangement pitch between an upper-stage locking pin for attaching a ladder provided in the section and a lower-stage locking pin provided below the upper-stage locking pin. The listed scaffolding.