JP3788407B2

JP3788407B2 - Safety handrail

Info

Publication number: JP3788407B2
Application number: JP2002230319A
Authority: JP
Inventors: 淳近藤
Original assignee: Alinco Inc
Current assignee: Alinco Inc
Priority date: 2002-08-07
Filing date: 2002-08-07
Publication date: 2006-06-21
Anticipated expiration: 2022-08-07
Also published as: JP2004068450A

Description

【０００１】
【発明の属する技術分野】
本発明は、建設作業現場等で枠組足場を多段状に組み立てる際に、常に先行した手摺がある状況で上段側足場の組立を行なえるようにするための安全手摺に関する。
【０００２】
【従来の技術】
枠組足場は、両側一対の脚柱と両脚柱の上端部をつなぐ横架材とからなる門形の建枠を一定間隔に対向させて、両建枠の横架材間に足場板を架け渡しながら、建枠を上方に継ぎ足して、順次多段状に組み上げてゆくわけであるが、下段側（下層側）建枠の横架材間に足場板を架け渡した後、その下段側建枠に上段側建枠を継ぎ足して上段側足場を組み立てる際には、その上段側足場の組立に先行して作業用の安全手摺を取り付け、足場組立作業の安全を図るようにしている。
【０００３】
【発明が解決しようとする課題】
従来、予め所要形状に枠組み形成された安全手摺を、下段側建枠の脚柱に取り付け、上段側足場の組立が終われば、その安全手摺を取り外し、更にその上の段の建枠の縦材に付け換えるようにした付け替え式の安全手摺があるが、このような付け替え式安全手摺では、その付け替え作業に非常な手間と時間がかかって、足場の組立作業能率が低下する上に、安全手摺の付け替え時にその安全手摺を落下させる危険性がある。また、枠組足場の組立に際しては、両建枠の対向する両脚柱間にブレースを架け渡すのが普通であるが、ブレースはＸ形に架け渡されるため、このＸ形ブレースの下側の三角形開口部から作業員が落下する危険性がある。
【０００４】
本発明の出願人は、上記のような問題を解決するために、枠組足場を多段状に組み立てる際に、付け替えることなく、建枠にそのまま取り付けておく安全手摺であって、取付作業を簡単容易で安全に行なえると共に、作業員の落下防止機能を有する安全手摺を先に出願している（特願２００２−１５７１０４）。
【０００５】
上記先出願の安全手摺は、図６の（Ａ）にＴ′で示すように、左右縦枠１１，１２、上下横枠１３，１４及び縦横の中桟１５〜１８によって形成され、両建枠４，４の対向する脚柱１，１間に配置される手摺本体７′と、この手摺本体７′の各縦枠１１，１２の中間部に設けられ、建枠４の横架材２に掛止される位置決めフック１０と、手摺本体７′の各縦枠１１，１２の下端部に設けられ、手摺本体７′を建枠４の脚柱１の上部側に固定する下部固定金具８と、同手摺本体７′を上段側建枠４の脚柱１の下部側に固定する上部固定金具９と、からなる。
【０００６】
この安全手摺Ｔ′によれば、足場への取付にあたっては、先に位置決めフック１０を１段目の足場の建枠４の横架材２に引っ掛けて手摺本体７′の位置を決め、その後に下部固定金具８を１段目足場の建枠４の脚柱１の上部側に取り付け、この１段目足場の上に組んだ２段目足場（図示せず）の脚柱１の下部側に上部固定金具９を取り付け、以降同様にして足場を組み上げつつ手摺本体７′を建枠４に取付ければよいから、手摺の取付作業を簡単容易で且つ安全に行なうことができる。また、手摺本体７′が左右縦枠１１，１２、上下横枠１３，１４及び縦横の中桟１５〜１８によって形成されると共に、手摺本体７′の上側半分が枠組足場の足場板（図１参照）から上方に突出するようになっているので、作業員の落下防止を図ることができる。
【０００７】
【発明が解決しようとする課題】
ところで、上記安全手摺Ｔ′では、図６の（Ａ）に示すように、手摺本体７′の上側半分が枠組足場の足場板から上方へ突出し、その下側半分がが足場板の下方へ突出した状態にあるが、足場板の下方へはそのように手摺本体７′の半分も突出させる必要がなく、その下方突出長さをもっと短くすることによって、手摺りの小型化及び軽量化を図ることができる。図６の（Ｂ）は、枠組足場の足場板から上方への突出長さ（手摺りとして必要な高さ）は（Ａ）に示す安全手摺Ｔ′の手摺本体７′と同じであるが、足場板から下方への手摺本体７の突出長さを短くした安全手摺Ｔを示すもので、建枠横架材２に掛止される位置決めフック１０が、手摺本体７の各縦枠１１，１２の中間部で手摺本体７の重心Ｇよりも下方に設けられている。
【０００８】
上記のように小型化、軽量化を図った手摺本体７では、図６の（Ａ）と（Ｂ）を比較参照して分かるように、手摺本体７の重心Ｇが上方部に移動してしまい、手摺設置作業を行なう際、作業者の胸元よりも上方で作業をしなければならず、作業性が悪く、手摺が落下して事故を起こす危険性がある。
【０００９】
そこで、本願発明は、上記のように手摺本体の小型化と簡略化のために枠組足場の足場板から下方への手摺本体の突出長さを短くして、建枠の横架材に掛止される位置決めフックを、手摺本体の各縦枠の中間部で手摺本体の重心よりも下方の位置に設けても、安全手摺の設置作業を容易にしかも安全に行なえるようにした安全手摺を提供することを目的とする。
【００１０】
【課題を解決するための手段】
請求項１に係る発明は、両側一対の脚柱１，１と両脚柱１，１の上端部をつなぐ横架材２とからなる建枠４を対向させて両建枠４，４の横架材２，２間に足場板６を架け渡しながら多段状に組み上げられる枠組足場に取り付けられる安全手摺であって、左右縦枠１１，１２、上下横枠１３，１４及び縦横の中桟１５〜１８によって形成され、両建枠４，４の対向する脚柱１，１間に配置される手摺本体７と、この手摺本体７の各縦枠１１，１２の中間部で手摺本体７の重心Ｇよりも下方に設けられ、建枠４の横架材２に掛止される位置決めフック１０と、手摺本体７の各縦枠１１，１２の下端部に設けられ、手摺本体７を建枠４の脚柱１の上部側に固定する下部固定金具８と、手摺本体７を上段側建枠４の脚柱１の下部側に固定する上部固定金具９と、からなり、前記位置決めフック１０の上部に、手摺本体７を逆様にして建枠４の横架材２に仮置きできるように横架材２に係止可能な係止部１０ａを設けてなることを特徴とする。
【００１１】
請求項２は、請求項１に記載の安全手摺において、前記位置決めフック１０の基端部には、手摺本体７を逆様にして横架材２に仮置きした状態から位置決めフック１０が横架材２に係止する設置状態へと反転させる時に横架材２の内側面に支持されて手摺本体７の左右方向のずれを防止するための突起部３５を設けてなることを特徴とする。
【００１２】
【発明の実施の形態】
以下に、本発明の実施形態について説明すると、図１の（Ａ）及び（Ｂ）は本発明に係る安全手摺Ｔの取付状態を示す斜視図である。図２の（Ａ）は安全手摺Ｔを枠組足場の外側から見た正面図、（Ｂ）は側面図である。枠組足場は、図１に示すように、両側一対の脚柱１，１と両脚柱１，１の上端部をつなぐ横架材２と補強枠３とからなる建枠４を、一定間隔に対向させて、両建枠４，４の対向する横架材２，２間に足場板６を架け渡すと共に、両脚柱１，１間に一対のブレース５，５をＸ形に架け渡しながら順次多段状に組み上げて形成される。
【００１３】
この枠組足場に取り付けられる本発明の安全手摺Ｔは、図１及び図２に示すように、左右縦枠１１，１２、上下横枠１３，１４及び縦横の中桟１５〜１８によって形成され、両建枠４，４の対向する脚柱１，１間に配置される手摺本体７と、この手摺本体７の各縦枠１１，１２の中間部で手摺本体７の重心Ｇよりも下方に設けられていて、建枠４の横架材２に掛止される位置決めフック１０と、手摺本体７の各縦枠１１，１２の下端部に設けられ、手摺本体７を建枠４の脚柱１の上部側に固定する下部固定金具８と、手摺本体７を上段側建枠４の脚柱１の下部側に固定する上部固定金具９と、からなるもので、位置決めフック１０の上部には、手摺本体７を逆様にして建枠４の横架材２に仮置きできるようにこの横架材２に係止可能な係止部１０ａが設けられている。
【００１４】
また図１及び図２から分かるように、手摺本体７の左側の縦枠１１に取り付けられる下部固定金具８と、右側の縦枠１２に取り付けられる下部固定金具８とは、連続スパン設置時において隣合う手摺本体７の下部固定金具８，８どうしが干渉しないように、互いに上下にずらして取り付けられている。上部固定金具９についても同様である。
【００１５】
下部固定金具８と上部固定金具９とは同じ構造であって、その詳細構造を図３及び図４に示す。図３の（Ａ）は固定金具８，９が固定位置にある時の正面図、（Ｂ）は平面図、（Ｃ）左側面図であり、また図４の（Ａ）は固定金具８，９が収納位置にある時の正面図、（Ｂ）は平面図、（Ｃ）左側面図である。これらの図を参照すれば、各固定金具８，９は、手摺本体７の各縦枠１１，１２に固着された取付部材１９と、つなぎ材２０の上端部に建枠４の脚柱１を掴むように嵌合する掴み材２１を連設し且つ下端側に手摺本体７の縦枠１１，１２に係合する受け材２２を連設してなる金具本体２３と、この金具本体２３を下記の固定位置と収納位置とにロックするロック手段とによって構成され、そしてロック手段は、基端部が手摺本体７の縦枠１１，１２の所要部に枢着されて回動可能なロックピン２４からなる。
【００１６】
取付部材１９は、両側板部１９ａ，１９ａとこれらをつなぐ連結板部１９ｂとでコ字枠状に形成されたもので、手摺本体７の各縦枠１１，１２に内側から嵌合してボルト２５で固定し、両側板部１９ａ，１９ａの先端側を外側方へ突出させている。この両側板部１９ａ，１９ａの突出端上部には、ロックピン係合溝２６が形成されている。
【００１７】
金具本体２３の掴み材２１は、両側板部２１ａ，２１ａとこれらをつなぐ連結板部２１ｂとにより建枠４の脚柱１に嵌合可能なコ字枠状に形成されたもので、つなぎ材２０に対し一定角度を成すように、その連結板部２１ｂがつなぎ材２０の上端部に固着されている（図３の（Ａ）参照）。また、このコ字枠状掴み材２１は、脚柱１に対する嵌合を容易にするため、その開口部の幅が奥部の幅より広くなるように形成されている（図３の（Ｂ）参照）。受け材２２は、手摺本体７の縦枠１１，１２に係合可能なコ字枠状に形成されたもので、つなぎ材２０に対し一定角度をなすと共に掴み材２１と互いに逆向きで平行するように、つなぎ材２０の下端部に固着されている。
【００１８】
上記のようにつなぎ材２０の上下両端部に掴み材２１と受け材２２とを突設した金具本体２３は、つなぎ材２０を取付部材１９の両側板部１９ａ，１９ａ間にその下方より嵌め込んで、このつなぎ材２０の下端所要部をボルト・ナットからなる枢軸２７で両側板部１９ａ，１９ａに枢着することにより、つなぎ材２０が前傾状態となって掴み材２１が建枠４の脚柱１に嵌合し且つ受け材２２が手摺本体７の縦枠１１，１２に係合する固定位置（図３の（Ａ）参照）と、掴み材２１及び受け材２２が脚柱１及び縦枠１１，１２から夫々離脱してその縦枠１１，１２に沿うように起立状態で折り畳み収納される収納位置（図４の（Ａ）参照）との間で回動可能に取付部材１９に取り付けられる。
【００１９】
ロック手段としてのロックピン２４は、金具本体２３を上記した固定位置と収納位置とに夫々ロックするもので、好ましくは金属丸棒材を曲げ加工することによって、図３及び図４に示すような略々Ｕ字状に形成されたピン本体２４ａと、このＵ字状ピン本体２４ａの両端部の取付部２４ａ，２４ａとからなり、この両端取付部２４ａ，２４ａが取付部材１９の上方所定位置で枢軸３３によって手摺本体７の縦枠１１，１２に枢着されている。上記枢軸３３はボルト・ナットからなる。
【００２０】
上記ロックピン２４は、固定位置では、当該ロックピン２４の遊端部であるピン本体２４ａの先端部を取付部材１９に設けてあるロックピン係合溝２６に係合させることによって金具本体２３をロックし、収納位置では、ピン本体２４ａの先端部を金具本体２３の掴み材２１の先端部に係合させることによって金具本体２３をロックするようになっている。しかして、ロックピン２４の枢軸３３は、この枢軸３３を中心に回動するロックピン２４のピン本体２４ａ先端部が固定位置で取付部材１９のロックピン係合溝２６に係合し、収納位置で掴み材２１の突端部２１ｏに係合するような位置に取り付けられる。従って、取付部材１９のロックピン係合溝２６及び収納位置における掴み材２１の突端部２１ｏは、ピン本体２４ａの先端部の回動軌跡上に位置することになる。
【００２１】
取付部材１９に設けてあるロックピン係合溝２６は、ロックピン２４のピン本体２４ａ先端部が図３の（Ａ）に示すような固定位置にある金具本体２３のつなぎ材２０の上面部に当接し得る位置に形成されると共に、ピン本体２４ａ先端部が挿脱できるように形成されている。この場合、ロックピン２４は、自然落下させた状態でその先端部がロックピン係合溝２６に嵌まり込むようになっいる。
【００２２】
そして、金具本体２３の掴み材２１は、図４の（Ａ）を参照すれば分かるが、収納位置でロックピン２４が掴み材２１の突端部２１ｏに係合する際に、クサビ効果をもたせてロック作用を有効に発揮させるために側板部２１ａの先端縁２８がテーパ状に形成されている。また、掴み材２１には片側の側板部２１ａにガタ止め用のボルト３２が螺装してあって、掴み材２１を建枠４の脚柱１に嵌合させた状態でボルト３２締め付けることにより、手摺本体７のガタツキを防止することができる。
【００２３】
図５の（Ａ）は位置決めフック１０の取付状態を示す正面図であり、（Ｂ）は平面図、（Ｃ）は左側面図である。この位置決めフック１０は、手摺本体７を建枠４に取り付ける際に、建枠４の横架材２に掛止させて位置決めするもので、先端部にフック部２９ａを形成したフック本体２９の基端部を、フック固定補助金具３０を用いて手摺本体７の重心Ｇより下方位置で手摺本体７の縦枠１１，１２にボルト３１ａ，３１ｂで固定したものである。そして、フック本体２９の上端部には、手摺本体７を逆様にして建枠４の横架材２に仮置きする時にこの横架材２に係止される係止部１０ａが設けられている。この係止部１０ａは、横架材２の外周面と同じ曲率の凹曲面状に形成されている。
【００２４】
また、位置決めフック１０の基端部には、手摺本体７を図８に示すように逆様にして横架材２に仮置きした状態から位置決めフック１０が横架材２に係止する設置状態へと反転させる時に横架材２の内側面に支持されて手摺本体７の左右方向のずれを防止するための突起部３５が設けられている。即ち、この突起部３５は、手摺本体７が逆様状態から設置状態まで反転する間に横架材２に引っ掛かる箇所がなくなる水平状態の位置で横架材２の長手方向に対し直交する状態となって、この突起部３５が横架材２の内側面で支持されることになり、それにより手摺本体７が左右方向のずれ、つまり横ずれを防止するようにしたもので、この図５の（Ｂ）及び（Ｃ）に示されるようなロールピンからなる。尚、このロールピンからなる突起部３５は、位置決めフック１０が横架材２に係止された時には、図５の（Ａ）〜（Ｃ）に示すように横架材２の長手方向と平行状態にあり、しかして図８の（Ａ）〜（Ｃ）に示すように手摺本体７を逆様状態から回転させて水平状態となった時に、この突起部３５が横架材２に対し直交する状態となって、上記の横ずれを防止することになる。
【００２５】
上述したような構成よりなる安全手摺Ｔの取付にあたり、先ず、図１の（Ａ）に示すように、一対の建枠４，４を対向配置し、両建枠４，４の対向する脚柱１，１間にブレース５，５をＸ状に掛張した後、両建枠４，４に安全手摺Ｔを取り付け、この後に両建枠４，４の対向する横架材２，２に足場板１を架け渡し、１段目の足場を組み立てる。また、この際、下部固定金具８及び上部固定金具９をいずれも、図４の（Ａ）及び（Ｂ）に示すように手摺本体７の縦枠１１，１２に沿って折り畳んだ収納位置にセットしておく。即ち、各固定金具８，９の金具本体２３を起立させて、ロックピン２４を掴み材２１の突端部２１ｏに係合させ、ロック状態にしておく。このように上下固定金具８，９を夫々収納位置に折り畳んでおけば、固定金具８，９が建枠４，４の脚柱１，１に何ら干渉しないから、手摺本体７を両建枠４，４の脚柱１，１間に迅速容易に挿入できる。
【００２６】
図６の（Ａ）に示す先に出願した安全手摺Ｔ′の場合は、位置決めフック１０が手摺本体７′の重心Ｇとほぼ同レベルに設けてあるため、図７の（Ａ）に示すように、手摺本体７′をそのままの状態で持ち上げて、位置決めフック１０を建枠４の横架材２に引っ掛ければよいが、本発明に係る安全手摺Ｔのように手摺本体７が小型・軽量化されて、位置決めフック１０が手摺本体７の重心Ｇより下方に位置する場合には、先願の安全手摺Ｔ′と同じ様にしたのでは、図７の（Ｂ）に示すように手摺本体７の重心Ｇが建枠４の横架材２より高い位置にくるため、手摺設置作業を行なうのに作業者Ｍの胸元より上方で作業をしなければならず、作業性が悪く、手摺本体７が落下する危険性がある。
【００２７】
上記のような不安定な状態を解消するために、本発明に係る安全手摺Ｔの場合には、手摺本体７の取付けにあたって、先ず、図８の（Ａ）、（Ｂ）及び（Ｃ）に示すように、手摺本体７を逆様にして持ち上げ、位置決めフック１０の係止部１０ａを建枠４の横架材２上面部に係止することにより、この位置決めフック１０を横架材２に預けて仮置きする。この場合、図８の（Ａ）に示すように、手摺本体７の位置決めフック１０から横枠１４までの距離ａよりも位置決めフック１０から横枠１３までの距離ｂが長く、また作業者Ｍは同図の（Ｂ）に示すように手摺本体７の重心Ｇ付近を持って作業できるため、極めて安定な状態で作業が行える。
【００２８】
図９の▲１▼〜▲４▼は、図８に示すように手摺本体７を逆様にして建枠４の横架材２に仮置きした状態から手摺本体７の下部固定金具８を建枠４の脚柱１の上部側に固定するまでの一連の動作を説明するもので、▲１▼に示すように手摺本体７を逆様にして位置決めフック１０を建枠４の横架材２に預けた状態から、手摺本体７を▲２▼から▲３▼に示すように回転させ、更に▲４▼に示すように直立した設置状態となるまで回転させる。この回転操作では、さほど力を加えることなく、容易に設置状態の位置まで反転移動させることができる。また、手摺本体７が脱落することもなく、極めて安全である。
【００２９】
また、この際、位置決めフック１０の基端部に突起部３５が設けられていて、手摺本体７を仮置きした状態から位置決めフック１０が横架材２に係止する設置状態へと反転させる時に突起部３５が横架材２の内側面に支持されるから、手摺本体７の横ずれを防止することができる。つまり、この突起部３５は、手摺本体７が逆様状態から設置状態まで反転する間に横架材２に引っ掛かる箇所がなくなる水平状態の位置で横架材２の内側面で支持されることによって、手摺本体７の横ずれを防止する。
【００３０】
手摺本体７を図９の▲４▼に示すような設置状態にしたならば、各下部固定金具８のロックピン２４を掴み材２１の突端部２１ｏから外して、ロックピン２４による金具本体２３のロックを解除した後、金具本体２３を起立姿勢から傾倒姿勢に回動して、その掴み材２１を建枠４の脚柱１に嵌合させると共に、受け材２２を手摺本体７の縦枠１１，１２に係合させて固定位置とする。そして、ロックピン２４の遊端部（ピン本体２４ａの先端部）を取付部材１９のロックピン係合溝２６に係合し、金具本体２３を固定位置にロックすることにより、各下部固定金具８を１段目足場の各建枠４の脚柱１の上部側に固定して、図１の（Ａ）に示す状態とする。この場合、枢軸３３を回動中心とするロックピン２４の回動軌跡と、枢軸２７を回動中心とする金具本体２３の回動軌跡とが異なっているため、ロックピン２４を人為的作業によって解除しない限り、金具本体２３の掴み材２１が建枠４の脚柱１から脱落する状態にはならず、従って安全性が確保される。
【００３１】
こうして下部固定金具８を１段目足場用建枠４の脚柱１の上部側に固定した状態では、図１及び図６の（Ｂ）を参照すれば分かるように、手摺本体７の下部横中桟１６が足場板６とほぼ同レベルにあって、手摺本体７の上横枠１３は、足場板６から例えば９００ｍｍ程度の高さに位置し、１段目足場の手摺上桟となり、またこの手摺本体７の上部横中桟１５は足場板６と上横枠１３の中間高さ位置にあって、１段目足場の手摺中桟となる。
【００３２】
次に、図１の（Ｂ）に示すように１段目足場の足場板１に昇って、この１段目側建枠４，４に２段目側の建枠４，４を夫々継ぎ足し、そして未だ固定していなかった安全手摺Ｔの上部固定金具９，９を、上述した下部固定金具８の場合と同様な方法で２段目側建枠４，４の脚柱１に固定する。更に、この２段側建枠４，４の対向する脚柱１，１間にブレース５，５をＸ状に掛張する。この２段目足場の組立作業は、１段目足場の足場板６上で行なうことになるが、この２段目足場には、下部固定金具８によって建枠４の脚柱１の上部側に固定した安全手摺Ｔの上半分が足場板６より上方に突出しているから、作業を安全に行なうことができる。しかも、この場合、安全手摺Ｔの手摺本体７は、上下各固定金具８，９により、１段目足場の建枠４，４と２段目足場の建枠４，４とに亘って確実強固に固定されることになる。
【００３３】
また、この２段目足場には、安全手摺りＴを上述した１段目の場合と同様にして取り付け、足場板１を架け渡す。以降は、上記同様な方法によって安全手摺Ｔを設置しながら、多段状に足場を組み上げてゆく。尚、この実施形態では、図面の表示が複雑になる関係上、両側一対の建枠４，４に足場板６を架け渡した最小限の足場を図示すると共に、この足場の手前側にのみ安全手摺Ｔを設置した状態を示しているが、実際には、足場は水平方向に連続スパンで連設され、また安全手摺Ｔは各足場の手前側と奥側の両側に設置されるものである。
【００３４】
以上説明した実施形態の安全手摺Ｔによれば、手摺本体７を枠組足場に取り付けるにあたっては、先ず最初に位置決めフック１０を１段目足場の建枠４の横架材２に引っ掛けて手摺本体７の位置を決定し、しかる後に下部固定金具８を１段目足場の建枠４の脚柱１の上部側に取り付け、そして１段目足場の上に組んだ２段目足場の建枠４の脚柱１の下部側に上部固定金具９を取り付け、以降同様にして枠組足場を組み上げつつ手摺本体７を建枠４に順次取付ければよいから、安全手摺Ｔの取付作業を簡単容易に、しかも安全に行なうことができると共に、手摺本体７の両縦枠１１，１２の夫々上下両端部が上下の固定金具８，９により建枠４の脚柱１に固定され、その中間部が位置決めフック１０によって脚柱１に支持されるので、安全手摺Ｔを建枠４に対し極めて安定良く且つ強固に設置することができる。
【００３５】
また、手摺本体７が左右縦枠１１，１２、上下横枠１３，１４及び縦横の中桟１５〜１８によって格子状に形成されると共に、手摺本体７の上半分が枠組足場の足場板６から上方に突出するようになっているから、このような手摺本体７によって作業員の落下防止を図ることが可能となり、従って従来足場に使用されているブレースを省略することもできる、つまりブレース代用品として使用することもできる。もちろん、この安全手摺Ｔは、従来のブレースと併用で使用することもできる。
【００３６】
また、図３の（Ａ）〜（Ｃ）、図４の（Ａ）及び（Ｂ）によって説明した固定金具８，９のロック手段は、金具本体２３の掴み材２１の先端縁２８をテーパに形成して、固定位置でロックピン２４をハンマー等で叩き込むことにより、そのテーパでクサビ効果を発揮させて、ピン本体２４ａが掴み材２１の突端部２１ｏにかち込んだ状態にロックするもので、このタイプのロック手段によれば、ロックピン２４をロック解除し、固定金具８，９を取り外す時も、ハンマー等の工具が必要になるため、より強固な手摺本体７の脱落事故防止手段となり得る。
【００３７】
上記のようなテーパによりクサビ効果を発揮させてロックする以外の方法として図４の（Ｃ）及び（Ｄ）に示すような方法がある。即ち、これは、掴み材２１の先端縁２８に、枢軸３３を中心に回転するロックピン２４のピン本体２４ａ先端部が乗り越えねばならない突起部３４を設け、収納位置でのロック時に、この突起部３４をハンマー等により叩き込むことにより、ピン本体２４ａ先端部が、突起部３４を乗り越えて、図４の（Ｄ）に示すようにこの突起部３４で係止された状態となり、収納位置が維持される。この方法によれば、金具本体２３を収納位置により確実にロックすることができる。この場合、ロックピン２４が丸棒材で形成されたものであれば、ロックピン２４が突起部３４を乗り越える際に接触部が少なくなるから、ハンマー等を使わず、手作業によって、金具本体２３を収納位置にロックさせることができる。
【００３８】
【発明の効果】
請求項１に係る発明の安全手摺は、両建枠の対向する脚柱間に配置される手摺本体と、この手摺本体の各縦枠の中間部に設けられ、建枠の横架材に掛止される位置決めフックと、手摺本体の各縦枠の下端部に設けられ、手摺本体を建枠の脚柱の上部側に固定する下部固定金具と、手摺本体を上段側建枠の脚柱の下部側に固定する上部固定金具とからなるもので、足場への取付にあたっては、先に位置決めフックを１段目足場の建枠の横架材に引っ掛けて手摺本体の位置を決め、その後に下部固定金具をこの１段目足場の建枠の脚柱の上部側に取り付け、この１段目足場の上に組んだ２段目足場の脚柱の下部側に上部固定金具を取り付け、以降同様にして足場を組み上げつつ手摺本体を建枠に取付ければよいから、手摺の取付作業を簡単容易に行なうことができると共に、手摺本体の両縦枠の夫々上下両端部が上下の固定金具で建枠の脚柱に固定され、その中間部が位置決めフックで脚柱に支持されるので、安全手摺を建枠に対して安定良く強固に設置することができる。
【００３９】
そして、この安全手摺では、手摺本体の小型化と軽量化を図って、位置決めフックの位置を、縦枠の中間部で手摺本体の重心より下方に設けていることから、手摺本体を建枠の横架材に位置決めフックで位置決めするにあたって、手摺本体の重心が横架材より高い位置にきて、作業者の胸元より上の方で作業をしなければならず、作業性が悪い上に手摺本体が落下する危険性がある。そこで、位置決めフックの上部に、手摺本体を逆様にして建枠の横架材に仮置きできるように横架材に係止可能な係止部を設けて、位置決めフックによる手摺本体の位置決め作業を行う際に、手摺本体を逆様にして持ち上げ、位置決めフックの係止部を建枠の横架材に係止することによって、この位置決めフックを横架材に預けて仮置きするようにしたから、作業者は手摺本体の重心付近を持って極めて安定な状態で作業を安全に行うことができる。
【００４０】
また、この安全手摺では、手摺本体が左右縦枠、上下横枠及び縦横の中桟によって形成されると共に、手摺本体の上半分が枠組足場の足場板から上方に突出するようになっているから、このような手摺本体によって作業員の落下防止を図ることが可能となり、従って従来足場に使用されているブレースを省略することもできる。
【００４１】
請求項２に係る発明の安全手摺によれば、位置決めフックの基端部に突起部が設けられているから、手摺本体を仮置きした状態から位置決めフックが横架材に係止する設置状態へと反転させる時にその突起部が横架材の内側面に支持され、それによって手摺本体の左右方向のずれを防止することができる。
【図面の簡単な説明】
【図１】（Ａ）及び（Ｂ）は本発明に係る安全手摺の取付状態を示す説明斜視図である。
【図２】（Ａ）は安全手摺を枠組足場の外側から見た正面図、（Ｂ）は左側面図である。
【図３】（Ａ）は固定金具が固定位置にある時の正面図、（Ｂ）は平面図、（Ｃ）左側面図である。
【図４】（Ａ）は固定金具が収納位置にある時の正面図、（Ｂ）は右側面図であり、（Ｃ）及び（Ｄ）は金具本体の掴み材の先端縁に突起部を設けた実施形態の作用を説明する説明図である。
【図５】（Ａ）は位置決めフックの取付状態を示す正面図、（Ｂ）は平面図、（Ｃ）は左側面図である。
【図６】（Ａ）は先願に係る安全手摺の取付状態を示す正面図、（Ｂ）は（Ａ）の安全手摺を小型化、軽量化した本願発明に係る安全手摺の取付状態を示す正面図である。
【図７】図６の（Ａ）に示す安全手摺の手摺本体の位置決めフックを建枠の横架材に掛止しようとしている状態、並びに位置決めフックを横架材に掛止し終えた状態を示す側面図、（Ｂ）は本願発明に係る安全手摺の手摺本体の位置決めフックを（Ａ）の場合と同様な方法で建枠の横架材に掛止しようとしている状態、並びに位置決めフックを横架材に掛止し終えた状態を示す側面図である。
【図８】（Ａ）は本願発明に係る安全手摺の手摺本体を逆様にして建枠の横架材に仮置きした状態の正面図、（Ｂ）はその側面図、（Ｃ）は（Ａ）の矢印Ｘで示す部分の拡大図である。
【図９】 ▲１▼〜▲４▼は、手摺本体を逆様にして建枠の横架材に仮置きした状態から手摺本体の下部固定金具を建枠の脚柱の上部側に固定するまでの一連の動作を説明する説明図である。
【符号の説明】
１建枠の脚柱
２建枠の横架材
４建枠
６足場板
Ｔ安全手摺
７手摺本体
８下部固定金具
９上部固定金具
１０位置決めフック
１０ａ係止部
１１，１２手摺本体の縦枠
１３，１４手摺本体の横枠
１５〜１８手摺本体の中桟
３５突起部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety handrail for enabling assembly of an upper stage side scaffold in a situation where a handrail is always preceded when a frame scaffold is assembled in a multistage shape at a construction work site or the like.
[0002]
[Prior art]
The frame scaffolding is a gate-shaped building frame consisting of a pair of pedestals on both sides and a horizontal frame that connects the upper ends of both pedestals. However, the building frame is added upwards and assembled in multiple stages sequentially. After the scaffolding board is bridged between the horizontal members of the lower (lower) building frame, the lower building frame is attached to the lower building frame. When assembling the upper stage scaffold by adding the upper stage building frame, a work safety handrail is attached prior to the assembly of the upper stage scaffold to ensure the safety of the scaffold assembly work.
[0003]
[Problems to be solved by the invention]
Conventionally, a safety handrail pre-framed to the required shape is attached to the pedestal of the lower building frame, and after the assembly of the upper platform is completed, the safety handrail is removed, and then the vertical material of the upper building frame Although there are replaceable safety handrails that can be replaced, such replacement-type safety handrails require a lot of labor and time for the replacement work, and the assembly work efficiency of the scaffolding decreases, and the safety handrail There is a risk of dropping the safety handrail when replacing the door. Also, when assembling the frame scaffold, it is normal to bridge the braces between the two pedestals facing each other, but since the braces are bridged in the X shape, the triangular opening on the lower side of the X shape braces There is a risk of the operator falling from the section.
[0004]
In order to solve the above problems, the applicant of the present invention is a safety handrail that is attached to a building frame as it is without being replaced when the frame scaffold is assembled in a multistage shape, and the installation work is easy and easy. In addition, a safety handrail having a function of preventing the worker from falling is already filed (Japanese Patent Application No. 2002-157104).
[0005]
The safety handrail of the prior application is formed by left and right vertical frames 11 and 12, upper and lower horizontal frames 13 and 14, and vertical and horizontal middle rails 15 to 18, as indicated by T 'in FIG. 4 and 4 are provided at the middle part of the handrail main body 7 ′ disposed between the opposed pillars 1 and 1 and the vertical frames 11 and 12 of the handrail main body 7 ′. A positioning hook 10 to be hooked, and a lower fixing bracket 8 provided at the lower end of each vertical frame 11, 12 of the handrail body 7 ′ and fixing the handrail body 7 ′ to the upper side of the pillar 1 of the building frame 4 And an upper fixing metal fitting 9 for fixing the handrail main body 7 'to the lower side of the pedestal 1 of the upper building frame 4.
[0006]
According to the safety handrail T ′, when attaching to the scaffold, the positioning hook 10 is first hooked on the horizontal member 2 of the building frame 4 of the first-stage scaffold to determine the position of the handrail body 7 ′. A lower fixing bracket 8 is attached to the upper side of the pedestal 1 of the building frame 4 of the first stage scaffold, and is attached to the lower side of the pedestal 1 of the second stage scaffold (not shown) assembled on the first stage scaffold. Since it is only necessary to attach the upper fixing bracket 9 and then attach the handrail body 7 'to the building frame 4 while assembling the scaffolding in the same manner, the attaching operation of the handrail can be performed easily and easily. The handrail body 7 'is formed by left and right vertical frames 11, 12, upper and lower horizontal frames 13, 14, and vertical and horizontal middle rails 15-18, and the upper half of the handrail body 7' is a scaffolding plate (see FIG. 1). Since it protrudes upward from the reference), it is possible to prevent the worker from falling.
[0007]
[Problems to be solved by the invention]
By the way, in the safety handrail T ′, as shown in FIG. 6A, the upper half of the handrail body 7 ′ protrudes upward from the scaffolding plate of the frame scaffold, and the lower half protrudes downward of the scaffolding plate. However, it is not necessary to project the half of the handrail main body 7 'so as to protrude downward from the scaffolding plate, and by reducing the length of the downward protrusion, the handrail can be reduced in size and weight. be able to. (B) in FIG. 6 is the same as the handrail body 7 ′ of the safety handrail T ′ shown in FIG. A safety handrail T in which the protruding length of the handrail body 7 downward from the scaffolding plate is shown, and a positioning hook 10 that is hooked on the building frame horizontal member 2 is connected to each vertical frame 11, 12 of the handrail body 7. Is provided below the center of gravity G of the handrail body 7.
[0008]
In the handrail main body 7 which is reduced in size and weight as described above, the gravity center G of the handrail main body 7 moves upward as can be seen by comparing (A) and (B) in FIG. When the handrail installation work is performed, the work must be performed above the operator's chest, and the workability is poor and there is a risk that the handrail may fall and cause an accident.
[0009]
Therefore, in the present invention, in order to reduce the size and simplification of the handrail main body as described above, the protrusion length of the handrail main body downward from the scaffolding plate of the frame scaffolding is shortened, and the hook is suspended on the horizontal member of the building frame. Provides a safety handrail that allows easy and safe installation of the safety handrail even if the positioning hook is provided at a position below the center of gravity of the handrail body in the middle of each vertical frame of the handrail body The purpose is to do.
[0010]
[Means for Solving the Problems]
In the invention according to claim 1, the horizontal mounting of the two building frames 4, 4 with the building frame 4 made up of a pair of pedestal columns 1, 1 and a horizontal member 2 connecting the upper ends of the two pedestal columns 1, 1 facing each other. It is a safety handrail attached to a frame scaffolding that is assembled in a multistage manner with the scaffolding plate 6 being bridged between the materials 2 and 2, and includes left and right vertical frames 11 and 12, vertical and horizontal frames 13 and 14, and vertical and horizontal inner frames 15 to 18. From the center of gravity G of the handrail main body 7 at the intermediate portion of the handrail main body 7 and the vertical frames 11 and 12 of the handrail main body 7 formed between Is also provided at the lower end of each of the vertical frames 11 and 12 of the handrail main body 7, and the handrail main body 7 is attached to the leg of the building frame 4. A lower fixing bracket 8 for fixing to the upper side of the column 1 and an upper fixing for fixing the handrail body 7 to the lower side of the leg column 1 of the upper building frame 4 And a locking portion 10a that can be locked to the horizontal member 2 so that the handrail body 7 can be temporarily placed on the horizontal member 2 of the building frame 4 in the reverse direction. It is characterized by providing.
[0011]
According to a second aspect of the present invention, in the safety handrail according to the first aspect, the positioning hook 10 is mounted on the base end portion of the positioning hook 10 from the state where the handrail main body 7 is reversed and temporarily placed on the horizontal member 2. Protrusions 35 are provided that are supported on the inner surface of the horizontal member 2 to prevent the handrail body 7 from shifting in the left-right direction when being reversed to the installation state that is locked to the member 2.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described. FIGS. 1A and 1B are perspective views showing an attachment state of a safety handrail T according to the present invention. 2A is a front view of the safety handrail T viewed from the outside of the frame scaffolding, and FIG. 2B is a side view. As shown in FIG. 1, the frame scaffolding is opposed to a building frame 4 composed of a horizontal frame 2 and a reinforcing frame 3 that connect a pair of leg posts 1, 1 and the upper ends of both leg posts 1, 1 at regular intervals. In addition, the scaffolding plate 6 is bridged between the facing horizontal members 2 and 2 of the two building frames 4 and 4, and a pair of braces 5 and 5 are bridged in an X shape between the two pillars 1 and 1 in sequence. It is formed by assembling into a shape.
[0013]
As shown in FIGS. 1 and 2, the safety handrail T of the present invention attached to the frame scaffold is formed by left and right vertical frames 11 and 12, upper and lower horizontal frames 13 and 14, and vertical and horizontal middle rails 15 to 18, Provided below the center of gravity G of the handrail main body 7 at the middle part of the handrail main body 7 disposed between the opposite pedestals 1 and 1 of the building frames 4 and 4 and the vertical frames 11 and 12 of the handrail main body 7. And the positioning hook 10 that is hooked on the horizontal member 2 of the building frame 4 and the lower ends of the vertical frames 11 and 12 of the handrail main body 7. It consists of a lower fixing bracket 8 that fixes to the upper side and an upper fixing bracket 9 that fixes the handrail body 7 to the lower side of the pedestal 1 of the upper-stage building frame 4. Locking portion that can be locked to the horizontal member 2 so that the main body 7 can be placed on the horizontal member 2 of the building frame 4 in the reverse manner. 0a is provided.
[0014]
Further, as can be seen from FIGS. 1 and 2, the lower fixing bracket 8 attached to the left vertical frame 11 of the handrail body 7 and the lower fixing bracket 8 attached to the right vertical frame 12 are adjacent to each other when the continuous span is installed. The lower fixing brackets 8 and 8 of the matching handrail body 7 are attached so as to be shifted up and down so that they do not interfere with each other. The same applies to the upper fixing bracket 9.
[0015]
The lower fixing bracket 8 and the upper fixing bracket 9 have the same structure, and their detailed structures are shown in FIGS. 3A is a front view when the fixing brackets 8 and 9 are in the fixing position, FIG. 3B is a plan view, and FIG. 4C is a left side view, and FIG. FIG. 9 is a front view when 9 is in the storage position, (B) is a plan view, and (C) is a left side view. Referring to these drawings, each of the fixing brackets 8 and 9 includes a mounting member 19 fixed to each of the vertical frames 11 and 12 of the handrail body 7, and the pedestal 1 of the building frame 4 at the upper end of the connecting material 20. A metal fitting body 23 in which a gripping material 21 that is fitted so as to be grasped and a receiving material 22 that is engaged with the vertical frames 11 and 12 of the handrail main body 7 are provided on the lower end side, and the metal fitting body 23 are described below. The locking means is configured to be locked at the fixed position and the storage position, and the locking means has a base end portion pivotally attached to a required portion of the vertical frames 11 and 12 of the handrail main body 7 and is rotatable. Consists of.
[0016]
The mounting member 19 is formed in a U-shaped frame shape with both side plate portions 19a, 19a and a connecting plate portion 19b connecting them, and is bolted to the vertical frames 11, 12 of the handrail body 7 from the inside. 25, and the front end sides of both side plate portions 19a, 19a are projected outward. Lock pin engaging grooves 26 are formed in the upper ends of the protruding ends of the side plate portions 19a, 19a.
[0017]
The holding member 21 of the metal fitting body 23 is formed in a U-shaped frame shape that can be fitted to the pedestal 1 of the building frame 4 by both side plate portions 21a, 21a and a connecting plate portion 21b that connects them. The connecting plate portion 21b is fixed to the upper end portion of the connecting member 20 so as to form a certain angle with respect to the head 20 (see FIG. 3A). In addition, the U-shaped frame-shaped gripping material 21 is formed so that the width of the opening is wider than the width of the back portion in order to facilitate the fitting to the pedestal 1 ((B) of FIG. 3). reference). The receiving member 22 is formed in a U-shaped frame shape that can be engaged with the vertical frames 11 and 12 of the handrail body 7, and forms a certain angle with respect to the connecting material 20 and is parallel to the gripping material 21 in opposite directions. In this way, it is fixed to the lower end portion of the connecting material 20.
[0018]
As described above, the metal fitting body 23 in which the gripping material 21 and the receiving material 22 project from the upper and lower ends of the connecting material 20 is fitted between the side plate portions 19a and 19a of the mounting member 19 from below. Then, the lower end required portion of the connecting member 20 is pivotally attached to the both side plates 19a, 19a by the pivot 27 made of bolts and nuts, so that the connecting member 20 is inclined forward and the gripping member 21 is attached to the building frame 4. A fixed position (see FIG. 3A) that fits to the pedestal 1 and the receiving material 22 engages with the vertical frames 11 and 12 of the handrail body 7, and the gripping material 21 and the receiving material 22 are the pedestal 1 and The mounting member 19 is pivotable between a storage position (see FIG. 4A) that is detached from the vertical frames 11 and 12 and folded and stored in a standing state along the vertical frames 11 and 12, respectively. It is attached.
[0019]
The lock pin 24 as a locking means is for locking the metal fitting body 23 at the fixed position and the storage position, respectively, and preferably by bending a metal round bar as shown in FIGS. The U-shaped pin body 24a has a substantially U-shaped pin body 24a and mounting portions 24a, 24a at both ends of the U-shaped pin body 24a. The both-end mounting portions 24a, 24a are located at predetermined positions above the mounting member 19. The pivot shaft 33 is pivotally attached to the vertical frames 11 and 12 of the handrail body 7. The pivot 33 consists of a bolt and a nut.
[0020]
In the fixed position, the lock pin 24 engages the metal pin main body 23 by engaging the tip end portion of the pin main body 24a, which is the free end portion of the lock pin 24, with the lock pin engaging groove 26 provided in the mounting member 19. In the locked position, the metal fitting body 23 is locked by engaging the tip of the pin main body 24a with the tip of the gripping member 21 of the metal fitting 23. Thus, the pivot 33 of the lock pin 24 engages with the lock pin engagement groove 26 of the mounting member 19 at the fixed position of the pin body 24a of the lock pin 24 that rotates about the pivot 33, and the storage position. Is attached at such a position as to engage with the protruding end 21o of the gripping member 21. Accordingly, the lock pin engaging groove 26 of the mounting member 19 and the protruding end portion 21o of the gripping member 21 at the storage position are located on the rotation locus of the tip end portion of the pin main body 24a.
[0021]
The lock pin engaging groove 26 provided in the mounting member 19 is formed on the upper surface of the connecting member 20 of the metal fitting body 23 in which the tip end portion of the pin body 24a of the lock pin 24 is in a fixed position as shown in FIG. It is formed at a position where it can come into contact, and is formed so that the tip of the pin body 24a can be inserted and removed. In this case, the lock pin 24 fits into the lock pin engagement groove 26 in a state where the lock pin 24 is naturally dropped.
[0022]
The gripping member 21 of the metal fitting body 23 can be understood by referring to FIG. 4A. When the lock pin 24 is engaged with the protruding end 21o of the gripping member 21 at the storage position, a wedge effect is provided. The tip edge 28 of the side plate portion 21a is formed in a tapered shape in order to effectively exert the locking action. Further, the gripping material 21 is screwed with a backlash bolt 32 on one side plate portion 21a, and is tightened with the bolt 32 in a state in which the gripping material 21 is fitted to the pedestal 1 of the building frame 4. The rattling of the handrail main body 7 can be prevented.
[0023]
5A is a front view showing a mounting state of the positioning hook 10, FIG. 5B is a plan view, and FIG. 5C is a left side view. When the handrail body 7 is attached to the building frame 4, the positioning hook 10 is hooked on the horizontal member 2 of the building frame 4 for positioning. The positioning hook 10 is based on the hook body 29 having a hook portion 29 a formed at the tip. The end portion is fixed to the vertical frames 11 and 12 of the handrail body 7 with bolts 31 a and 31 b at a position below the center of gravity G of the handrail body 7 using the hook fixing auxiliary metal fitting 30. The upper end of the hook body 29 is provided with a locking portion 10a that is locked to the horizontal member 2 when the handrail main body 7 is temporarily placed on the horizontal member 2 of the building frame 4 in the reverse manner. Yes. The locking portion 10 a is formed in a concave curved surface shape having the same curvature as the outer peripheral surface of the horizontal member 2.
[0024]
In addition, at the base end portion of the positioning hook 10, the handrail main body 7 is reversely installed as shown in FIG. 8, and the positioning hook 10 is locked to the horizontal member 2 from the temporarily placed state on the horizontal member 2. Protruding portions 35 are provided that are supported on the inner surface of the horizontal member 2 and prevent the handrail main body 7 from shifting in the left-right direction when reversed. That is, the protrusion 35 is in a state of being orthogonal to the longitudinal direction of the horizontal member 2 at a horizontal position where there is no place to be caught on the horizontal member 2 while the handrail body 7 is reversed from the reverse state to the installed state. Thus, the projection 35 is supported by the inner surface of the horizontal member 2 so that the handrail main body 7 is prevented from shifting in the left-right direction, that is, lateral shifting. It consists of roll pins as shown in B) and (C). In addition, when the positioning hook 10 is locked to the horizontal member 2, the protruding portion 35 made of the roll pin is in a state parallel to the longitudinal direction of the horizontal member 2 as shown in FIGS. Thus, as shown in FIGS. 8A to 8C, when the handrail main body 7 is rotated from the reverse state to become a horizontal state, the projection 35 is orthogonal to the horizontal member 2. Thus, the above-described lateral shift is prevented.
[0025]
In attaching the safety handrail T having the above-described configuration, first, as shown in FIG. 1A, a pair of building frames 4 and 4 are arranged opposite to each other, and the opposite pillars of both building frames 4 and 4 are arranged. After the braces 5 and 5 are stretched in an X shape between 1 and 1, a safety handrail T is attached to both the building frames 4 and 4, and then the scaffolds 2 and 2 facing the both building frames 4 and 4 are attached. Cross the board 1 and assemble the first stage scaffolding. At this time, the lower fixing bracket 8 and the upper fixing bracket 9 are both set in the storage position folded along the vertical frames 11 and 12 of the handrail body 7 as shown in FIGS. Keep it. That is, the bracket main body 23 of each of the fixing brackets 8 and 9 is erected, and the lock pin 24 is engaged with the protruding end portion 21o of the gripping member 21 to be in a locked state. If the upper and lower fixing brackets 8 and 9 are folded in the storage positions in this way, the fixing brackets 8 and 9 do not interfere with the pedestals 1 and 1 of the building frames 4 and 4, so , 4 can be quickly and easily inserted between the pillars 1 and 1.
[0026]
In the case of the safety handrail T ′ filed earlier shown in FIG. 6A, the positioning hook 10 is provided at substantially the same level as the center of gravity G of the handrail main body 7 ′, and therefore, as shown in FIG. The handrail main body 7 'is lifted as it is and the positioning hook 10 is hooked on the horizontal member 2 of the building frame 4. However, the handrail main body 7 is small and light like the safety handrail T according to the present invention. When the positioning hook 10 is positioned below the center of gravity G of the handrail main body 7, the handrail main body as shown in FIG. 7 has a center of gravity G higher than the horizontal frame 2 of the building frame 4, so the handrail installation work must be performed above the chest of the worker M, and the workability is poor. There is a risk of 7 falling.
[0027]
In order to eliminate the unstable state as described above, in the case of the safety handrail T according to the present invention, when the handrail body 7 is attached, first, in FIGS. 8 (A), (B) and (C). As shown, the handrail main body 7 is lifted upside down, and the locking portion 10a of the positioning hook 10 is locked to the top surface of the horizontal member 2 of the building frame 4 so that the positioning hook 10 is attached to the horizontal member 2. Deposit and temporarily store. In this case, as shown in FIG. 8A, the distance b from the positioning hook 10 to the horizontal frame 13 is longer than the distance a from the positioning hook 10 to the horizontal frame 14 of the handrail body 7, and the operator M Since the work can be performed with the vicinity of the center of gravity G of the handrail main body 7 as shown in FIG. 5B, the work can be performed in an extremely stable state.
[0028]
In (1) to (4) in FIG. 9, the lower fixing bracket 8 of the handrail body 7 is erected from the state in which the handrail body 7 is reversed and temporarily placed on the horizontal member 2 of the building frame 4 as shown in FIG. A series of operations until the frame 4 is fixed to the upper part of the pedestal 1 will be described. As shown in (1), the handrail main body 7 is reversed and the positioning hook 10 is attached to the horizontal member 2 of the building frame 4. The handrail main body 7 is rotated as shown in (2) to (3), and further rotated until it is in an upright installation state as shown in (4). In this rotation operation, it is possible to easily reversely move to the installed position without applying much force. Further, the handrail main body 7 does not fall off and is extremely safe.
[0029]
Further, at this time, when the projection 35 is provided at the proximal end of the positioning hook 10 and the handrail main body 7 is temporarily placed, the positioning hook 10 is reversed from the installation state where the positioning hook 10 is locked to the horizontal member 2. Since the projection 35 is supported on the inner surface of the horizontal member 2, the lateral displacement of the handrail body 7 can be prevented. In other words, the projection 35 is supported on the inner surface of the horizontal member 2 in a horizontal state where there is no place to be caught on the horizontal member 2 while the handrail body 7 is reversed from the reverse state to the installed state. The lateral displacement of the handrail body 7 is prevented.
[0030]
When the handrail body 7 is set in the installation state as shown in (4) in FIG. 9, the lock pin 24 of each lower fixing bracket 8 is removed from the projecting end portion 21 o of the gripping member 21, and the bracket body 23 is locked by the lock pin 24. After releasing the lock, the metal fitting body 23 is rotated from the standing posture to the tilting posture so that the gripping material 21 is fitted to the pedestal 1 of the building frame 4 and the receiving material 22 is moved to the vertical frame 11 of the handrail main body 7. , 12 to be fixed positions. Then, the free end portion of the lock pin 24 (the tip end portion of the pin main body 24a) is engaged with the lock pin engaging groove 26 of the mounting member 19, and the metal fitting body 23 is locked in a fixed position, whereby each lower fixing metal 8 Is fixed to the upper side of the pedestal 1 of each building frame 4 of the first stage scaffold, and the state shown in FIG. In this case, since the pivot locus of the lock pin 24 with the pivot 33 as the pivot center and the pivot locus of the metal fitting body 23 with the pivot 27 as the pivot center are different, the lock pin 24 is manually moved. Unless it is released, the gripping material 21 of the metal fitting body 23 does not fall off from the pedestal 1 of the building frame 4, so that safety is ensured.
[0031]
In this state where the lower fixing bracket 8 is fixed to the upper side of the pedestal 1 of the first-stage scaffolding frame 4, as can be seen with reference to FIGS. The middle rail 16 is substantially at the same level as the scaffolding plate 6, and the upper horizontal frame 13 of the handrail main body 7 is located at a height of, for example, about 900 mm from the scaffolding plate 6, and becomes a handrail upper rail for the first stage scaffolding. The upper horizontal rail 15 of the handrail main body 7 is located at an intermediate height position between the scaffold plate 6 and the upper horizontal frame 13 and becomes the handrail middle rail of the first stage scaffold.
[0032]
Next, as shown in FIG. 1 (B), the first stage scaffolding plate 1 is raised, and the second stage building frames 4, 4 are respectively added to the first stage building frames 4, 4. Then, the upper fixing brackets 9 of the safety handrail T that have not yet been fixed are fixed to the pedestals 1 of the second-stage building frames 4 and 4 in the same manner as in the case of the lower fixing bracket 8 described above. Further, the braces 5 and 5 are stretched in an X shape between the opposite pillars 1 and 1 of the two-stage building frames 4 and 4. The assembly work of the second stage scaffold is performed on the scaffold plate 6 of the first stage scaffold, and this second stage scaffold is attached to the upper side of the pillar 1 of the building frame 4 by the lower fixing bracket 8. Since the upper half of the fixed safety handrail T protrudes upward from the scaffold plate 6, the work can be performed safely. In addition, in this case, the handrail body 7 of the safety handrail T is securely and firmly secured to the building frames 4 and 4 of the first-stage scaffolding and the building frames 4 and 4 of the second-stage scaffolding by the upper and lower fixing brackets 8 and 9. It will be fixed to.
[0033]
In addition, a safety handrail T is attached to the second stage scaffold in the same manner as the first stage described above, and the scaffold plate 1 is bridged. Thereafter, the scaffolding is assembled in a multistage manner while the safety handrail T is installed by the same method as described above. In this embodiment, since the display of the drawing is complicated, a minimum scaffold in which the scaffolding plate 6 is bridged between the pair of building frames 4 and 4 on both sides is illustrated, and only the front side of the scaffold is safe. Although the state where the handrail T is installed is shown, in practice, the scaffolding is continuously connected in a continuous span in the horizontal direction, and the safety handrail T is installed on both the front side and the back side of each scaffolding. .
[0034]
According to the safety handrail T of the embodiment described above, when attaching the handrail main body 7 to the frame scaffolding, first, the positioning hook 10 is first hooked on the horizontal member 2 of the building frame 4 of the first stage scaffolding. After that, the lower fixing bracket 8 is attached to the upper side of the pedestal 1 of the first-stage scaffolding frame 4 and the second-stage scaffolding frame 4 assembled on the first-stage scaffolding. Since the upper fixing bracket 9 is attached to the lower side of the pedestal 1 and the handrail main body 7 may be sequentially attached to the building frame 4 while assembling the frame scaffolding in the same manner, the attaching operation of the safety handrail T can be easily and easily performed. Both the vertical frames 11 and 12 of the handrail main body 7 are fixed to the pedestal 1 of the building frame 4 by the upper and lower fixing brackets 8 and 9, and the middle portion thereof is the positioning hook 10. Because it is supported by the pedestal 1 by the safety handrail The can be installed very good stability and firmly to Kenwaku 4.
[0035]
In addition, the handrail body 7 is formed in a lattice shape by the left and right vertical frames 11 and 12, the upper and lower horizontal frames 13 and 14, and the vertical and horizontal middle rails 15 to 18, and the upper half of the handrail body 7 is from the scaffolding plate 6 of the frame scaffold. Since it protrudes upward, it is possible to prevent the worker from falling by such a handrail body 7, and therefore, it is possible to omit the brace conventionally used for the scaffold, that is, the brace substitute. It can also be used as Of course, this safety handrail T can also be used in combination with a conventional brace.
[0036]
Further, the locking means of the fixing brackets 8 and 9 described with reference to FIGS. 3A to 3C and FIGS. 4A and 4B taper the leading edge 28 of the gripping member 21 of the bracket body 23. By forming and hitting the lock pin 24 with a hammer or the like at the fixed position, the wedge effect is exerted by the taper, and the pin body 24a is locked in a state of being pushed into the protruding end portion 21o of the gripping material 21, According to this type of locking means, even when the lock pin 24 is unlocked and the fixing brackets 8 and 9 are removed, a tool such as a hammer is required, which can be a stronger means for preventing the handrail body 7 from falling off. .
[0037]
There is a method as shown in FIGS. 4C and 4D other than the method of locking by exerting the wedge effect by the taper as described above. That is, this is provided with a protrusion 34 on the front end edge 28 of the gripping member 21 to which the front end of the pin body 24a of the lock pin 24 that rotates about the pivot 33 must get over, and this protrusion when locked in the storage position. By hitting the pin 34 with a hammer or the like, the tip of the pin body 24a gets over the protrusion 34 and is locked by the protrusion 34 as shown in FIG. 4D, and the storage position is maintained. The According to this method, the metal fitting body 23 can be reliably locked by the storage position. In this case, if the lock pin 24 is formed of a round bar, the contact portion is reduced when the lock pin 24 gets over the projection 34, so that the metal fitting body 23 is manually operated without using a hammer or the like. Can be locked in the storage position.
[0038]
【The invention's effect】
The safety handrail of the invention according to claim 1 is provided at a middle part of the handrail main body disposed between the opposite pedestals of the two building frames and each vertical frame of the handrail main body, and is hung on the horizontal member of the building frame. Positioning hooks to be stopped, provided at the lower end of each vertical frame of the handrail main body, a lower fixing bracket for fixing the handrail main body to the upper side of the pedestal of the building frame, and the handrail main body of the pedestal of the upper frame It consists of an upper fixing bracket that is fixed to the lower side. When attaching to the scaffolding, the positioning hook is first hooked on the horizontal frame of the building frame of the first stage scaffolding, and then the handrail body position is determined. The fixing bracket is attached to the upper side of the pedestal of the building frame of the first stage scaffolding, the upper fixing bracket is attached to the lower side of the pedestal of the second stage scaffolding assembled on the first stage scaffolding, and so on. Since it is only necessary to attach the handrail body to the building frame while assembling the scaffolding, it is easy and easy to install the handrail The upper and lower ends of both vertical frames of the handrail main body are fixed to the pedestal of the building frame by upper and lower fixing brackets, and the intermediate portion is supported by the pedestal by the positioning hooks. Can be stably and firmly installed on the building frame.
[0039]
In this safety handrail, the handrail body is reduced in size and weight, and the positioning hook is located below the center of gravity of the handrail body at the middle part of the vertical frame. When positioning the horizontal frame with positioning hooks, the center of gravity of the handrail body must be higher than that of the horizontal frame, and work must be performed above the operator's chest. There is a risk of the unit falling. Therefore, the handrail main body is positioned by the positioning hook by providing a locking part on the upper part of the positioning hook that can be locked to the horizontal member so that the handrail main body can be temporarily placed on the horizontal member of the building frame. When doing this, the handrail body is lifted upside down, and the locking portion of the positioning hook is locked to the horizontal frame of the building frame, so that the positioning hook is temporarily placed on the horizontal frame. Therefore, the operator can safely perform the work in a very stable state with the vicinity of the center of gravity of the handrail main body.
[0040]
Further, in this safety handrail, the handrail main body is formed by the left and right vertical frames, the upper and lower horizontal frames and the vertical and horizontal center rails, and the upper half of the handrail main body protrudes upward from the scaffolding plate of the frame scaffolding. Such a handrail main body makes it possible to prevent the worker from falling, and therefore, the brace conventionally used for the scaffold can be omitted.
[0041]
According to the safety handrail of the invention according to claim 2, since the projection is provided at the base end portion of the positioning hook, from the state where the handrail main body is temporarily placed to the installation state where the positioning hook is locked to the horizontal member. The projection is supported on the inner surface of the horizontal member when it is reversed, thereby preventing the horizontal displacement of the handrail body.
[Brief description of the drawings]
FIGS. 1A and 1B are explanatory perspective views showing an attachment state of a safety handrail according to the present invention.
FIG. 2A is a front view of a safety handrail viewed from the outside of a frame scaffold, and FIG. 2B is a left side view.
FIGS. 3A and 3B are a front view when a fixing bracket is in a fixing position, FIG. 3B is a plan view, and FIG. 3C is a left side view;
4A is a front view when the fixing bracket is in the storage position, FIG. 4B is a right side view, and FIG. 4C and FIG. 4D are projections on the leading edge of the gripping material of the bracket body. It is explanatory drawing explaining the effect | action of provided embodiment.
5A is a front view showing a mounting state of the positioning hook, FIG. 5B is a plan view, and FIG. 5C is a left side view.
FIG. 6A is a front view showing the state of attachment of the safety handrail according to the previous application, and FIG. 6B shows the state of attachment of the safety handrail according to the present invention in which the safety handrail of FIG. It is a front view.
FIG. 7 shows a state where the positioning hook of the handrail body of the safety handrail shown in FIG. 6A is about to be hooked to the horizontal member of the building frame and a state where the positioning hook has been hooked to the horizontal member. (B) shows a state in which the positioning hook of the handrail body of the safety handrail according to the present invention is hooked to the horizontal frame of the building frame in the same manner as in (A), and the positioning hook is It is a side view which shows the state which has finished latching on the base material.
FIG. 8A is a front view showing a state in which the handrail body of the safety handrail according to the present invention is reversed and temporarily placed on the horizontal frame of the building frame, FIG. 8B is a side view thereof, and FIG. It is an enlarged view of the part shown by the arrow X of A).
[Fig. 9] In (1) to (4), the lower fixing bracket of the handrail body is fixed to the upper side of the pedestal of the building frame from the state where it is temporarily placed on the horizontal frame of the building frame with the handrail body reversed. It is explanatory drawing explaining a series of operation | movement until.
[Explanation of symbols]
1 Pillar of building frame
2 Horizontal materials for building frames
4 building frames
6 Scaffolding board
T safety handrail
7 Handrail body
8 Lower fixing bracket
9 Upper fixing bracket
10 Positioning hook
10a Locking part
11, 12 Vertical frame of the handrail body
13, 14 Horizontal frame of handrail body
15-18 Middle rail of handrail body
35 Protrusion

Claims

Safety that attaches to a frame scaffold that is built up in a multistage manner with a scaffolding plate spanning between the horizontal members of both building frames, with the building frame consisting of a pair of pedestals on both sides and a horizontal member that connects the upper ends of the two pillars facing each other A handrail,
It is formed by the left and right vertical frames, the vertical and horizontal frames, and the vertical and horizontal middle rails, and is arranged between the opposite pedestals of both building frames, and the center of each vertical frame of the handrail main body is more than the center of gravity of the handrail main body. Positioning hooks that are provided below and hooked to the horizontal frame of the building frame, and lower fixing brackets that are provided at the lower ends of the vertical frames of the handrail main body and fix the handrail main body to the upper side of the pillars of the building frame And an upper fixing bracket for fixing the handrail body to the lower side of the pedestal of the upper building frame,
A safety handrail provided with a locking portion that can be locked to a horizontal member so that the handrail main body can be temporarily placed on the horizontal member of the building frame in an inverted manner on the positioning hook.

At the base end of the positioning hook, on the inner side of the horizontal member when the positioning hook is reversed from the state temporarily placed on the horizontal member to the installation state where the positioning hook is locked to the horizontal member. The safety handrail according to claim 1, wherein the safety handrail is provided with a protrusion that is supported to prevent a lateral shift of the handrail main body.