JP2017040113A - Overhanging passage of steel structure - Google Patents

Overhanging passage of steel structure Download PDF

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JP2017040113A
JP2017040113A JP2015162758A JP2015162758A JP2017040113A JP 2017040113 A JP2017040113 A JP 2017040113A JP 2015162758 A JP2015162758 A JP 2015162758A JP 2015162758 A JP2015162758 A JP 2015162758A JP 2017040113 A JP2017040113 A JP 2017040113A
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hook
cantilever
steel structure
scaffold
stand
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JP6498075B2 (en
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雅人 稲岡
Masahito Inaoka
雅人 稲岡
新吾 久松
Shingo Hisamatsu
新吾 久松
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Hirose and Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an overhanging passage that enables a cantilever scaffold to be safely installed and removed in a short period of time without use of a separate work platform, an angle brace, and the like.SOLUTION: An overhanging passage of a steel structure includes: a cantilever scaffold 30 that comprises a scaffolding board 31 having a plurality of notches 32 formed on one side, and a plurality of cantilever hooks 20 assuming a hook shape protruding upward; and a plurality of hook stands 50 that are erected on a stringer 41 of a steel structure 40. A fitting part 55 formed in the hook stand 50 and a fitting part 24 formed in the cantilever hook 20 are fitted together so that the cantilever scaffold 30 can be supported in a cantilevered manner by the stringer 41.SELECTED DRAWING: Figure 1

Description

本発明は仮橋、仮桟橋、構台等の仮設鉄骨構造物または本設鉄骨構造物の側方に拡張して設ける張出通路に関するものである。   The present invention relates to a temporary steel structure such as a temporary bridge, a temporary pier, a gantry or the like, or an overhanging passage provided to be extended to the side of the main steel structure.

クローラクレーン等の大型重機を用いて仮橋、仮桟橋を施工することは周知である（特許文献１，２）。
図９を参照して説明すると、狭い幅員の床板ａ上でクローラクレーン等の重機ｂが縦架設作業を行う際に、重機ｂの幅員が床板ａの幅員の大半を占めてしまい、作業員等の通行が阻害される場合がある。
このような場合には既設の床板ａの側方に覆工板製の張出床板ｃを増設して作業員の通路や退避領域を確保する必要がある。張出床板ｃの増設にあたり、張出床板ｃの支持手段が問題となる。
図１０を参照して張出床板ｃの支持手段について説明する。
同図は前提となる仮桟橋の側端部の断面を示すもので、仮桟橋は橋脚である複数の鋼柱ｄと、これらの鋼柱ｄの上部に横架した枕材ｅと、主桁ｆを介して枕材ｅの上部を覆う覆工板製の床板ａとを有している。
従来は、剛性の方杖ｇを用いて張出床板ｃの下面を支持することが現場で行われている。
方杖ｇは、その垂直部を挟締金具やボルト等の連結具ｈを用いて最外端の鋼柱ｄの側面に固定するとともに、方杖ｇに張出床板ｃを支承させて既設の床板ａを側方に拡張する。なお、符号ｉは張出床板ｃの側端に立設した高欄である。 It is well known to construct temporary bridges and temporary piers using large heavy machinery such as crawler cranes (Patent Documents 1 and 2).
Referring to FIG. 9, when a heavy machine b such as a crawler crane performs a vertical installation work on a floor board a having a narrow width, the width of the heavy machine b occupies most of the width of the floor board a. May be obstructed.
In such a case, it is necessary to add an overhanging floor board c made of a lining board to the side of the existing floor board a to secure a worker's passage and retreat area. When the extended floor board c is added, the support means for the extended floor board c becomes a problem.
The support means of the extended floor board c is demonstrated with reference to FIG.
This figure shows the cross section of the side end of the temporary pier, which is a premise. The temporary pier has a plurality of steel columns d that are piers, a pillow material e that is laid horizontally on these steel columns d, and a main girder. It has the floor board a made of a lining board which covers the upper part of the pillow material e through f.
Conventionally, supporting the lower surface of the extended floor board c using a rigid wand g has been performed in the field.
The cane g is fixed to the side surface of the steel column d at the outermost end by using a connecting tool h such as a clamp or a bolt, and the overhanging floor plate c is supported on the cane g. The floor board a is expanded to the side. In addition, the code | symbol i is the handrail erected at the side end of the overhanging floor board c.

特開平１０−４６５２３号公報Japanese Patent Laid-Open No. 10-46523 特開２００１−１１５４２１号公報JP 2001-115421 A

既述した従来技術はつぎの問題点を有する。
＜１＞鋼柱ｄの全高が数十ｍにもおよぶような長尺の場合には、方杖ｇを地組しておくことができないだけでなく、方杖ｇを既設の床板ａ上から取り付けることもできない。
方杖ｇの固定作業を行うには、方杖ｇの直下に別途の作業足場を設置する必要があり、作業足場の設置と解体撤去に多くのコストと時間を要する。
＜２＞方杖ｇを鋼柱ｄに固定するには、方杖ｇを吊り込んで取付位置に誘導した後、複数の連結具ｈを手作業で組み付ける必要があり、方杖ｇの固定作業に多くの手数と時間がかかる。方杖ｇを解体撤去する場合も同様に多くの手数と時間がかかる。
＜３＞方杖ｇの取り付けや解体は危険な高所作業となるため、安全性の確保が問題となる。
＜４＞張出床板ｃを増設するには、重量構造物である方杖ｇと張出床板ｃの単品をクレーンで吊り込んで固定する吊り込み作業と固定作業を繰り返し行う必要があるために、クレーンの占用時間が長くなって張出床板ｃの増設コストが高くつく。
＜５＞方杖を用いずに張出床板を増設する他の手段として、床板の側方に間隔を隔てて複数の吊上用支柱を立設し、各吊上用支柱の頭部と水平に配置した張出床板の外端部との間に斜めに吊り材を接続して吊り上げ支持する形態も考えられる。
張出床板を吊り材で吊り上げ支持する形態では、吊用支柱の高さが張出床板の幅員以上の高さとなるため、背の高い吊用支柱が障害物となるだけでなく、張出床板の上方を斜めに横断する吊り材も通行の邪魔になる。 The prior art described above has the following problems.
<1> In the case where the total height of the steel column d is several tens of meters, not only the brace g can not be grounded but also the brace g can be removed from the existing floor board a. It cannot be installed.
In order to perform the fixing work of the cane g, it is necessary to install a separate work scaffold immediately below the cane g, and much cost and time are required for installing and dismantling the work scaffold.
<2> In order to fix the cane g to the steel column d, it is necessary to manually assemble a plurality of couplers h after the cane g is suspended and guided to the mounting position. It takes a lot of work and time. Similarly, it takes a lot of work and time to dismantle and remove the cane g.
<3> Since the installation and disassembly of the wand g is a dangerous work at a high place, ensuring safety is a problem.
<4> In order to increase the extended floor board c, it is necessary to repeatedly perform the hanging work and the fixing work for hanging and fixing a single piece of the wand g and the extended floor board c, which are heavy structures, with a crane. The crane occupancy time becomes longer and the extension cost of the extended floor plate c is high.
<5> As another means of adding an extended floor board without using a cane, a plurality of lifting pillars are erected on the side of the floor board at intervals, and horizontally with the head of each lifting pillar. A form in which a suspension member is connected obliquely between the outer end portions of the overhanging floor plates arranged on the floor and supported by lifting is also conceivable.
In the form in which the extended floor board is lifted and supported by the suspension material, the height of the suspension column becomes higher than the width of the extended floor plate, so that the tall suspension column not only becomes an obstacle, but also the extended floor plate Hanging material that crosses diagonally above the door also obstructs traffic.

本発明は以上の点に鑑みて成されたもので、その目的とするところは、別途の作業足場、方杖等を用いずに片持足場の設置および撤去を安全で短時間に行える張出通路を提供することにある。   The present invention has been made in view of the above points. The object of the present invention is to provide an overhang capable of installing and removing a cantilevered scaffold safely and in a short time without using a separate work scaffold or a cane. To provide a passage.

本発明は、床板を敷設した鉄骨構造物の最上位の桁材の側方に増設する張出通路であって、一側に複数の切欠を形成した足場板と、該足場板の切欠に面して上向きに突設した鉤形を呈する複数の片持フックとを有する片持足場と、前記最外側の桁材に立設し、前記片持フックと嵌合可能な複数のフックスタンドとを具備し、前記フックスタンドが具備する嵌合部と、前記片持フックが具備する嵌合部とを嵌合させて前記片持足場を鉄骨構造物の桁材に片持ちで支持させたことを特徴とする。
本発明の他の形態において、前記片持フックに当接させたフックスタンドの上端部および中間部の二つの当接部を介して片持足場をフックスタンドに片持ちで支持させる。
本発明の他の形態において、前記フックスタンドは、前記最外側の桁材の外方へ向けて傾斜する傾斜部と、該傾斜部の先端から鉛直に向けて延設し、片持フックの挿嵌部と嵌合可能な嵌合部とを具備する。
本発明の他の形態において、前記最外側の桁材と片持フックの起立部との間に間隙を形成するように、前記フックスタンドが略く字形を呈する。
本発明の他の形態において、足場板の切欠が前記フックスタンドを収容可能な開口幅であり、該切欠内に収容したフックスタンドが切欠空間を閉鎖する寸法関係にある。
本発明の他の形態において、前記片持フックは足場板を横断する横断部と、横断部の一端から真上に延設した起立部と、起立部の一端から水平に延設した水平部と、水平部の端部から真下に延設した嵌合部とを有する。
本発明の他の形態において、切欠を介して足場板の上方へ突出する片持フックの起立部の突出長が、前記フックスタンドおよび片持フックが具備する両嵌合部を嵌合させたときに、足場板の上面が該足場板と隣り合う鉄骨構造物の床板の上面と面一となる寸法関係にある。
本発明の他の形態において、鉄骨構造物が仮橋、仮桟橋、構台等の仮設鉄骨構造物、または本設鉄骨構造物である。 The present invention is an overhang passage that is added to the side of the uppermost beam of a steel structure laid with a floor board, and a scaffold board having a plurality of cutouts formed on one side thereof, and a surface facing the cutout of the scaffold board. A cantilever scaffold having a plurality of cantilever hooks projecting upward, and a plurality of hook stands that are erected on the outermost girders and can be fitted to the cantilever hooks. And having the fitting portion provided in the hook stand and the fitting portion provided in the cantilever hook fitted together so that the cantilever scaffold is supported by the girders of the steel structure in a cantilever manner. Features.
In another embodiment of the present invention, the cantilever scaffold is supported by the hook stand in a cantilever manner through the two abutting portions of the upper end portion and the intermediate portion of the hook stand abutted against the cantilever hook.
In another embodiment of the present invention, the hook stand includes an inclined portion that is inclined outwardly of the outermost beam member, and extends vertically from the tip of the inclined portion, and the cantilever hook is inserted. The fitting part and the fitting part which can be fitted are comprised.
In another embodiment of the present invention, the hook stand has a generally square shape so as to form a gap between the outermost beam member and the upright portion of the cantilever hook.
In another embodiment of the present invention, the notch of the scaffold plate has an opening width capable of accommodating the hook stand, and the hook stand accommodated in the notch has a dimensional relationship for closing the notch space.
In another aspect of the present invention, the cantilever hook includes a transverse part that crosses the scaffolding plate, an upright part that extends directly from one end of the transverse part, and a horizontal part that extends horizontally from one end of the upright part. And a fitting portion extending directly below from the end of the horizontal portion.
In another embodiment of the present invention, when the protruding length of the upright portion of the cantilever hook that protrudes upward from the scaffolding plate through the notch is fitted into both the fitting portions of the hook stand and the cantilever hook. In addition, the upper surface of the scaffold plate is in a dimensional relationship with the upper surface of the floor plate of the steel structure adjacent to the scaffold plate.
In another embodiment of the present invention, the steel structure is a temporary steel structure such as a temporary bridge, a temporary pier, a gantry, or a permanent steel structure.

本発明はつぎの効果を奏する。
＜１＞ユニット化した片持足場を増設現場へクレーンで吊り込むだけの簡単に作業で設置でき、撤去するときもユニット化した片持足場を吊り上げて簡単に撤去できる。
したがって、別途の作業足場や法杖枠等を使用せずに、張出通路の設置および撤去を安全で短時間に行える
＜２＞クレーンの占用時間を大幅に短縮できて、張出通路の増設コストを低減できる。
＜３＞床板から突出する片持フックの高さが低いので、他の作業や通行の邪魔にならない。
＜４＞フックスタンドが高さ方向に距離を隔てた二点で片持足場の荷重を分散して支持できる。
＜５＞増設した足場板の上面と隣り合う鉄骨構造物の床板の上面との間に段差のないフラットな連続面を形成できる。 The present invention has the following effects.
<1> The unitized cantilever scaffold can be installed simply by hanging it to the expansion site with a crane, and when it is removed, the unitized cantilever scaffold can be easily lifted and removed.
Therefore, installation and removal of the overhanging passage can be done safely and in a short time without using a separate work scaffold or a cane frame. <2> The occupation time of the crane can be greatly reduced, and the extension of the overhanging passage can be increased. Cost can be reduced.
<3> Since the height of the cantilever hook protruding from the floor board is low, it does not interfere with other work or traffic.
<4> The load of the cantilevered scaffold can be dispersed and supported at two points where the hook stand is spaced apart in the height direction.
<5> A flat continuous surface without a step can be formed between the upper surface of the added scaffolding plate and the upper surface of the floor plate of the adjacent steel structure.

本発明に係る張出通路を鉄骨構造物の側方に増設した側面図The side view which extended the overhang path concerning the present invention to the side of a steel structure 一部を省略した張出通路の斜視図Perspective view of overhanging passage with some parts omitted 一部を省略した張出通路の設置時の斜視図Perspective view at the time of installation of the overhang passage with a part omitted 一部を省略した片持足場の平面図Plan view of a cantilevered scaffold with some parts omitted 片持足場とフックスタンドの嵌合構造の拡大図Enlarged view of the fitting structure of the cantilever scaffold and hook stand 足場板を補強した片持足場の一部の正面図Front view of a part of a cantilevered scaffold reinforced with a scaffolding board フックスタンドの設置時の説明図Illustration of hook stand installation 片持足場のモーメント図Cantilever scaffold moment diagram 本発明が前提とする狭い幅員の床板上に重機を配置して縦架設作業を行う現場の平面図The top view of the field where heavy equipment is arranged on the floor board of the narrow width which this invention presupposes and vertical installation work is done 図９におけるＸ−Ｘの断面図XX sectional drawing in FIG.

以下に図面を参照しながら本発明を詳細に説明する。   Hereinafter, the present invention will be described in detail with reference to the drawings.

＜１＞鉄骨構造物の張出通路の概要
図１に一部を破断した鉄骨構造物４０用の張出通路１０の全体図を示す。
鉄骨構造物４０は最上位の桁材４１に覆工板製の床板４２が敷設してある例えば仮橋、仮桟橋、構台等の仮設鉄骨構造物または本設鉄骨構造物を含む。
張出通路１０は、一側に複数の片持フック５０を具備した片持足場３０と、鉄骨構造物４０の最外側の桁材４１に立設した複数のフックスタンド５０とにより構成する。
本発明に係るは張出通路１０、フックスタンド２０が具備する嵌合部５５と、片持フック２０が具備する嵌合部２４とを嵌合させて片持足場３０を鉄骨構造物４０の最外側の桁材４１に片持ちで支持させるように構成したものである。 <1> Outline of Overhanging Passage of Steel Structure FIG. 1 shows an overall view of an overhanging passage 10 for a steel structure 40 with a part thereof broken.
The steel structure 40 includes, for example, a temporary steel structure such as a temporary bridge, a temporary pier, a gantry, or a permanent steel structure in which a floor plate 42 made of a lining plate is laid on an uppermost beam member 41.
The overhang passage 10 includes a cantilever scaffold 30 having a plurality of cantilever hooks 50 on one side, and a plurality of hook stands 50 erected on the outermost beam member 41 of the steel structure 40.
According to the present invention, the cantilever scaffold 30 is made the most of the steel structure 40 by fitting the overhanging passage 10, the fitting portion 55 provided in the hook stand 20, and the fitting portion 24 provided in the cantilever hook 20. The outer girder 41 is supported in a cantilever manner.

＜２＞片持足場
図１〜４を参照して説明すると、片持足場３０は少なくとも矩形を呈する足場板３１と、足場板３１の長辺の一側に開設した切欠３２に面して上向きに突設した鉤形を呈する複数の片持フック２０とを有する。 <2> Cantilever Scaffolding Referring to FIGS. 1 to 4, the cantilevered scaffold 30 faces upward at least to a rectangular scaffolding plate 31 and a notch 32 opened on one side of the long side of the scaffolding plate 31. And a plurality of cantilever hooks 20 having a hook shape projecting from the top.

＜２．１＞足場板
足場板３１は矩形を呈する剛性枠の上面に床材を設けた組立体である。
図４に例示した足場板３１では、平行に配置した主桁３１ａ，３１ａの間に交差させて複数の横断桁３１ｂを接合して剛性枠を形成した形態を示すが、桁材の配置形態は図示した形態に限定されるものではない。 <2.1> Scaffolding plate The scaffolding plate 31 is an assembly in which a flooring is provided on the upper surface of a rectangular rigid frame.
The scaffold plate 31 illustrated in FIG. 4 shows a form in which a rigid frame is formed by joining a plurality of transverse girders 31b so as to intersect between the main girders 31a and 31a arranged in parallel. It is not limited to the illustrated form.

＜２．１．１＞床材
本例では足場板３１の床材としてエキスパンドメタルと滑り止め付き鉄板の組み合せた形態を示すが、床材についても公知の各種素材を適用できる。 <2.1.1> Flooring material In this example, the flooring material of the scaffolding plate 31 is a combination of an expanded metal and a non-slip iron plate, but various known materials can also be applied to the flooring material.

＜２．１．２＞切欠
足場板３１の長辺の一側には、片持フック２０の配置間隔に合せて複数の切欠３２が開設してある。
切欠３２は、片持フック２０の起立部２２およびフックスタンド５０の当板５３を収容可能な開口幅で開設してある。 <2.1.2> Notch A plurality of notches 32 are formed on one side of the long side of the scaffold plate 31 according to the arrangement interval of the cantilever hooks 20.
The notch 32 is opened with an opening width that can accommodate the upright portion 22 of the cantilever hook 20 and the contact plate 53 of the hook stand 50.

＜２．１．３＞幅木と高欄
足場板３１の他側には幅木３３と着脱式の高欄３４を取り付けておく。
高欄３４は予め足場板３１に取り付けておいてもよいが、片持足場３０の吊り込みの障害となるときは取り外しておき後付けするとよい。
また使途に応じて各種の追加部材を足場板３１に付設しておくことも可能である。 <2.1.3> Skirting board and handrail On the other side of the scaffold board 31, a baseboard 33 and a detachable handrail 34 are attached.
The handrail 34 may be attached to the scaffold plate 31 in advance, but it may be removed and attached later when it becomes an obstacle to the suspension of the cantilever scaffold 30.
It is also possible to attach various additional members to the scaffold plate 31 according to the purpose of use.

＜２．１．４＞足場板の補強構造
足場板３１の強度が不足する場合は、必要に応じて足場板３１を補強する。
図６に例示した補強構造について説明すると、片持フック２０の横断部２１を中心に主桁３１ａの間に繋ぎ材３１ｃと一対の補強材３１ｄ，３１ｄを架け渡すことで足場板３１の曲げ強度を高めることができる。
足場板３１を補強することで、吊り込み時における足場板３１の撓み変形を抑制して片持ちフック２０とフックスタンド５０との嵌合を容易にするだけでなく、片持ちフック２０およびフックスタンド５０の配設ピッチを広げることができる。 <2.1.4> Reinforcement structure of scaffold plate When the strength of the scaffold plate 31 is insufficient, the scaffold plate 31 is reinforced as necessary.
The reinforcing structure illustrated in FIG. 6 will be described. The bending strength of the scaffold plate 31 is obtained by bridging the connecting member 31c and the pair of reinforcing members 31d and 31d between the main girders 31a around the transverse portion 21 of the cantilever hook 20. Can be increased.
Reinforcing the scaffold plate 31 not only suppresses bending deformation of the scaffold plate 31 during suspension and facilitates the fitting of the cantilever hook 20 and the hook stand 50 but also the cantilever hook 20 and the hook stand. The arrangement pitch of 50 can be widened.

＜２．２＞片持フック
図１〜５を参照して説明すると、片持フック２０はフックスタンド５０に嵌合させて足場板３１を片持ちするための掛止体である。
本例の片持フック２０について説明すると、片持フック２０は足場板３１を横断する横断部２１と、横断部２１の一端から真上に延設した起立部２２と、起立部２２の一端から水平に延設した水平部２３と、水平部２３の端部から真下に延設した凸状の嵌合部２４とを有し、これらは複数の鋼材を接合して形成する。
横断部２１と起立部２２の間はＬ字形を呈し、起立部２２から水平部２３と嵌合部２４の間は逆Ｕ字形（鉤形）を呈する。
嵌合部２４には連結ピン５６を挿通可能なピン穴が穿設してある。 <2.2> Cantilever Hook If it demonstrates with reference to FIGS. 1-5, the cantilever hook 20 will be fitted to the hook stand 50, and is a latching body for cantilevering the scaffold board 31. FIG.
The cantilever hook 20 of this example will be described. The cantilever hook 20 includes a crossing part 21 that crosses the scaffold plate 31, a standing part 22 that extends right above one end of the crossing part 21, and one end of the standing part 22. It has the horizontal part 23 extended horizontally, and the convex-shaped fitting part 24 extended just under from the edge part of the horizontal part 23, These join these several steel materials and form.
Between the crossing part 21 and the upright part 22, an L-shape is exhibited, and between the upright part 22 and the horizontal part 23 and the fitting part 24, an inverted U-shape (saddle shape) is exhibited.
A pin hole into which the connecting pin 56 can be inserted is formed in the fitting portion 24.

＜２．２．１＞片持フックと足場板との関係
片持フック２０と足場板３１は分離不能な一体構造の関係にある。
本例では横断部２１に足場板３１を搭載して一体化した形態について示すが、横断部２１を省略し、足場板３１を構成する剛性枠の一部から起立部２２を延設してもよい。 <2.2.1> Relationship between Cantilever Hook and Scaffolding Plate The cantilever hook 20 and the scaffolding plate 31 are in an integral structure that cannot be separated.
In this example, a form in which the scaffolding plate 31 is mounted on and integrated with the transverse part 21 is shown, but the transverse part 21 may be omitted and the standing part 22 may be extended from a part of the rigid frame constituting the scaffolding board 31. Good.

＜２．２．２＞片持フックの突出長
切欠３２を通じて足場板３１の上方へ突出する片持フック２０の起立部２２の突出長は、嵌合部２４をフックスタンド５０の嵌合部５５に嵌合させたとき、足場板３１の上面が既設の床板４２の上面と面一となる寸法関係にある。 <2.2.2> Protruding length of cantilever hook The protruding length of the upright portion 22 of the cantilever hook 20 that protrudes upward from the scaffolding plate 31 through the notch 32 is the same as the fitting portion 55 of the hook stand 50. When fitted, the upper surface of the scaffold plate 31 is in a dimensional relationship with the upper surface of the existing floor plate 42.

＜２．２．３＞片持フックの設置数と配置間隔
片持フック２０の設置数と配置間隔は、足場板３１の平面積と載荷重等を考慮して適宜選択する。 <2.2.3> Number of Cantilever Hooks Installed and Arrangement Interval The number of cantilever hooks 20 installed and the interval between them are appropriately selected in consideration of the flat area of the scaffolding plate 31 and the loading load.

＜３＞フックスタンド
図５を参照して説明すると、フックスタンド５０は片持フック２０を介して足場板３１の一側を吊り下げた状態で、鉄骨構造物４０の最外側の桁材４１に保持させるための鋼製の支持部材である。
フックスタンド５０は、ボルト連結手段等を介して桁材４１に対して着脱自在である。
フックスタンド５０は全体形状が略「く」の字形を呈していて、最外側の桁材４１の外方へ向けて傾斜する傾斜部５１と、傾斜部５１の先端から鉛直に向けて延設し、片持フック２０の挿嵌２４と嵌合可能な凹状の嵌合部５５とを具備する。
傾斜部５１は複数のボルト穴を有する基板５２に対して傾斜して固着してある。 <3> Hook Stand Referring to FIG. 5, the hook stand 50 is attached to the outermost beam member 41 of the steel structure 40 in a state where one side of the scaffold plate 31 is suspended via the cantilever hook 20. It is a steel support member for holding.
The hook stand 50 can be attached to and detached from the beam member 41 via a bolt connecting means or the like.
The hook stand 50 has a substantially “<” shape as a whole, and has an inclined portion 51 that is inclined outwardly from the outermost beam member 41, and extends vertically from the tip of the inclined portion 51. The concave fitting portion 55 that can be fitted to the insertion fitting 24 of the cantilever hook 20 is provided.
The inclined portion 51 is fixed to the substrate 52 having a plurality of bolt holes in an inclined manner.

＜３．１＞フックスタンドを屈曲させた理由
フックスタンド５０を略く字形に形成したのは、片持フック２０の起立部２２が最外側の桁材４１と干渉せずに、片持フック２０およびフックスタンド５０の両嵌合部２４，５５を円滑に嵌合させるためである。
換言すれば、最外側の桁材４１と片持フック２０の起立部２２との間に所定の間隙Ｇを形成した状態で、片持フック２０の凸状の嵌合部２４をフックスタンド５０の凹状の嵌合部５５に嵌合させるためである。 <3.1> Reason for Bending the Hook Stand The hook stand 50 is formed in a substantially square shape because the upright portion 22 of the cantilever hook 20 does not interfere with the outermost beam member 41 and the cantilever hook 20 This is because the fitting portions 24 and 55 of the hook stand 50 are smoothly fitted.
In other words, the convex fitting portion 24 of the cantilever hook 20 is connected to the hook stand 50 in a state where a predetermined gap G is formed between the outermost beam member 41 and the standing portion 22 of the cantilever hook 20. This is for fitting into the concave fitting portion 55.

＜３．２＞当板
傾斜部５１と凹状の嵌合部５５の境界部には水平に向けて矩形の当板５３が介装してある。
当板５３は傾斜部５１および嵌合部５５の断面より大形の板体であり、当板５３の一部が傾斜部５１と嵌合部５５の屈曲した外側境界部から外方へ向けて突出している。
当板５３は足場板３１の切欠３２内に収容したときに切欠空間を閉鎖できる寸法関係にある。 <3.2> Abutting Plate A rectangular abutting plate 53 is interposed horizontally at the boundary between the inclined portion 51 and the concave fitting portion 55.
The contact plate 53 is a plate body that is larger than the cross sections of the inclined portion 51 and the fitting portion 55, and a part of the contact plate 53 is directed outward from the bent outer boundary portion of the inclined portion 51 and the fitting portion 55. It protrudes.
The abutment plate 53 has a dimensional relationship that allows the notch space to be closed when accommodated in the notch 32 of the scaffold plate 31.

＜３．３＞補強板
本例では傾斜部５１の引張側に補強板５４を付設した形態を示すが、補強板５４は必須ではない。 <3.3> Reinforcing Plate In this example, the reinforcing plate 54 is provided on the tension side of the inclined portion 51. However, the reinforcing plate 54 is not essential.

＜３．４＞フックスタンドの高さ
空間の活用性を考慮するとフックスタンド５０の高さは低いほど望ましいが、低過ぎると片持足場３０の安定支持が難しくなる。
そこで、フックスタンド５０の高さは足場板３１の幅員より低い寸法とする。
換言すれば、図示した形態におけるフックスタンド５０の高さは、例えば既設の床板４２の厚さの約２．５倍前後の高さを有する。
また、傾斜部５１は、例えば既設の床板４２の厚さと同じ高さか、床板４２の厚さよりやや低い高さを有する。
嵌合部５５の高さは、例えば既設の床板４２の厚さの１．５倍前後の高さを有する。
フックスタンド５０の全高やフックスタンド５０の各部位の高さは上記した例示に限定されず、適宜選択が可能である。 <3.4> Hook Stand Height Considering the utility of space, the height of the hook stand 50 is preferably as low as possible, but if it is too low, stable support of the cantilevered scaffold 30 becomes difficult.
Therefore, the height of the hook stand 50 is set to be lower than the width of the scaffold plate 31.
In other words, the height of the hook stand 50 in the illustrated form has a height of about 2.5 times the thickness of the existing floor plate 42, for example.
The inclined portion 51 has, for example, the same height as the thickness of the existing floor plate 42 or a height slightly lower than the thickness of the floor plate 42.
The height of the fitting part 55 has a height of about 1.5 times the thickness of the existing floor plate 42, for example.
The overall height of the hook stand 50 and the height of each part of the hook stand 50 are not limited to the above examples, and can be appropriately selected.

＜４＞片持フックとフックスタンドの嵌合構造
片持フック２０のお嵌合部２４はフックスタンド５０の嵌合部５５にガタツキのない状態で嵌合可能である。 <4> Fitting Structure of Cantilever Hook and Hook Stand The fitting portion 24 of the cantilever hook 20 can be fitted to the fitting portion 55 of the hook stand 50 without any backlash.

＜４．１＞片持フックとフックスタンドの嵌合部の断面形状
本例では片持フック２０およびフックスタンド５０の各嵌合部２４，５５の断面形状が方形を呈する形態について示すが、円形や他の多角形であってもよい。
要は、凸状の嵌合部２４，５５の何れか一方が嵌合部２４，５５の何れか他方に嵌挿できる断面形状であればよい。 <4.1> Cross-sectional shape of fitting portion of cantilever hook and hook stand In this example, the cross-sectional shape of each of the fitting portions 24 and 55 of the cantilever hook 20 and the hook stand 50 is shown as a square. Or other polygons.
The point is that any one of the convex fitting portions 24 and 55 may have a cross-sectional shape that can be inserted into any one of the fitting portions 24 and 55.

＜４．２＞片持フックとフックスタンドの嵌合部の組み合せについて
本例では片持フック２０の嵌合部２４を凸状に形成し、フックスタンド５０の嵌合部５５を凹状（筒状）に形成した組み合せについて説明するが、この組み合わせを逆にして片持フック２０の嵌合部２４を凹状に形成し、フックスタンド５０の嵌合部５５を凸状に形成して嵌合させてもよい。 <4.2> Combination of cantilever hook and hook stand fitting portion In this example, the fitting portion 24 of the cantilever hook 20 is formed in a convex shape, and the fitting portion 55 of the hook stand 50 is concave (tubular). The combination formed in (2) will be described, but this combination is reversed so that the fitting portion 24 of the cantilever hook 20 is formed in a concave shape, and the fitting portion 55 of the hook stand 50 is formed in a convex shape and fitted. Also good.

［張出通路の設置方法］
つぎに張出通路１０の設置方法について説明する。 [Installation method of overhang passage]
Next, a method for installing the overhang passage 10 will be described.

＜１＞フックスタンドの設置
図７に示すように、鉄骨構造物４０の最外側の桁材４１の上面に、片持フック２０の配置間隔に合せて複数のフックスタンド５０を配置し、その基板５２をボルト止めして固定する。この際、各フックスタンド５０を構成する嵌合部５５を既設の床板４２から離隔させて固定する。
フックスタンド５０の設置にあたり、既設の床板４２を利用して設置できるので、鉄骨構造物４０の側方に別途の作業足場を設ける必要がない。 <1> Installation of Hook Stand As shown in FIG. 7, a plurality of hook stands 50 are arranged on the upper surface of the outermost beam member 41 of the steel structure 40 in accordance with the arrangement interval of the cantilever hooks 20. Secure 52 with bolts. At this time, the fitting portion 55 constituting each hook stand 50 is fixed apart from the existing floor plate 42.
When the hook stand 50 is installed, it can be installed using the existing floor plate 42, so that it is not necessary to provide a separate work scaffold on the side of the steel structure 40.

＜２＞片持足場の設置
図１，３に示すように、水平状態を保ったままクレーンで吊り上げた片持足場３０を、鉄骨構造物４０の側方へ移動して、片持フック２０をフックスタンド５０に嵌合させることで片持足場３０の設置を完了する。
以降に片持足場３０の設置工程について詳しく説明する。 <2> Installation of Cantilever Scaffolding As shown in FIGS. 1 and 3, the cantilever scaffold 30 lifted by a crane while keeping the horizontal state is moved to the side of the steel structure 40, and the cantilever hook 20 is moved. Installation of the cantilevered scaffold 30 is completed by fitting with the hook stand 50.
Hereinafter, the installation process of the cantilever scaffold 30 will be described in detail.

＜２．１＞片持足場の吊り込み
足場板３１の一側に形成した各片持フック２０の嵌合部２４を対応する各フックスタンド５０の真上に位置させる。 <2.1> Suspension of cantilever scaffold The fitting part 24 of each cantilever hook 20 formed on one side of the scaffold plate 31 is positioned directly above each corresponding hook stand 50.

＜２．２＞片持フックとフックスタンドの嵌合
この状態で、片持足場３０の全体をゆっくりと降下させて、片持フック２０の嵌合部２４をフックスタンド５０の嵌合部５５に差し込んで嵌合させる。
片持足場３０を降下させる際、略く字形を呈するフックスタンド５０の嵌合部５５が桁材４１の外方へ張り出ているので、片持フック２０の起立部２２が桁材４１と干渉しないだけでなく、片持フック２０の起立部２２の外面がガイド面となってフックスタンド５０の当板５３の側面と摺接するため、両嵌合部２４，５５の嵌合作業を短時間の間に円滑に行うことができる。
足場板３１の切欠３２内にフックスタンド５０を収容することで、切欠空間の大半が封鎖されるので、面一に形成した足場板３１と既設の床板４２の上面の間に大きな隙間が生じない。 <2.2> Fitting of cantilever hook and hook stand In this state, the entire cantilever scaffold 30 is slowly lowered, and the fitting part 24 of the cantilever hook 20 is replaced with the fitting part 55 of the hook stand 50. Insert and fit.
When the cantilever scaffold 30 is lowered, the fitting portion 55 of the hook stand 50 having a substantially square shape protrudes outward from the beam member 41, so that the standing portion 22 of the cantilever hook 20 interferes with the beam member 41. In addition, since the outer surface of the upright portion 22 of the cantilever hook 20 serves as a guide surface and is in sliding contact with the side surface of the abutment plate 53 of the hook stand 50, the fitting operation of the fitting portions 24 and 55 can be performed in a short time. Can be done smoothly.
By accommodating the hook stand 50 in the cutout 32 of the scaffold board 31, most of the cutout space is sealed, so that a large gap does not occur between the scaffold board 31 formed flush with the upper surface of the existing floor board 42. .

＜２．３＞連結ピンの挿入
両嵌合部２４，５５に連結ピン５６を差し込んで外れを防止する。
フックスタンド５０の嵌合部５５の上端面と片持フック２０の水平部２３の下面との当接面を介してして片持足場３０の荷重をフックスタンド５０へ伝えるので、連結ピン５６に荷重は作用しない。
本発明では、鉄骨構造物４０を支える鋼柱の全高が数十ｍにもおよぶような長尺の場合であっても、鉄骨構造物４０の側方に別途の作業足場を設けることなく、一回のクレーン操作で以て鉄骨構造物４０の側方に張出通路１０を増設できる。
また片持フック２０とフックスタンド５０の位置合わせ作業も既設の床板４２上で安全に行える。 <2.3> Insertion of connecting pin The connecting pin 56 is inserted into the fitting portions 24 and 55 to prevent the connecting pin 56 from coming off.
Since the load of the cantilever scaffold 30 is transmitted to the hook stand 50 via the contact surface between the upper end surface of the fitting portion 55 of the hook stand 50 and the lower surface of the horizontal portion 23 of the cantilever hook 20, The load does not act.
In the present invention, even when the total height of the steel column supporting the steel structure 40 is several tens of meters, a separate work scaffold is not provided on the side of the steel structure 40. The overhang passage 10 can be added to the side of the steel structure 40 by one crane operation.
Further, the alignment work between the cantilever hook 20 and the hook stand 50 can be performed safely on the existing floor plate 42.

＜３＞片持足場の片持ち支持構造
本発明ではフックスタンド５０を介して片持足場３０を鉄骨構造物４０の桁材４１に片持ちで支持する構造である。
図５を参照して片持足場３０の片持ち支持構造（片持ち梁）について詳しく説明すると、片持フック２０の水平部２３の下面とフックスタンド５０の上端との間に第１当接部Ｐ１が形成され、片持フック２０の起立部２２の外面とフックスタンド５０の当板５３の側面との間に第２当接部Ｐ２が形成される。第２当接部Ｐ２は第１当接部Ｐ１の下方に形成される。
片持足場３０の重量は、これらの第１および第２当接部Ｐ１，Ｐ２の二点を通じてフックスタンド５０に支持される。
図８に示した片持足場３０のモーメント図からも明らかなように、上下の位置関係にある第１および第２当接部Ｐ１，Ｐ２の二点を通じて支持できるので、片持足場３０を安定した姿勢で片持ちできる。
さらに、第１および第２当接部Ｐ１，Ｐ２間の距離が高さ方向に離れているので、片持フック２０だけでなくフックスタンド５０に対しても荷重を分散できるので、特定の部位に過大な応力が集中しないで済む。
さらにまた、高さ方向に距離を隔てた二点で片持足場３０を支持できるので、片持フック２０の突出長を低く抑えることができる。 <3> Cantilevered Support Structure of Cantilever Scaffolding In the present invention, the cantilevered scaffold 30 is supported by the girders 41 of the steel structure 40 in a cantilever manner via the hook stand 50.
The cantilever support structure (cantilever beam) of the cantilever scaffold 30 will be described in detail with reference to FIG. 5. The first abutting portion is provided between the lower surface of the horizontal portion 23 of the cantilever hook 20 and the upper end of the hook stand 50. P 1 is formed, and a second contact portion P 2 is formed between the outer surface of the standing portion 22 of the cantilever hook 20 and the side surface of the contact plate 53 of the hook stand 50. The second contact portion P 2 is formed on the first lower contact portion P 1.
The weight of the cantilever scaffold 30 is supported by the hook stand 50 through the two points of the first and second contact portions P 1 and P 2 .
As can be seen from the moment diagram of the cantilevered scaffold 30 shown in FIG. 8, the cantilever scaffold 30 can be supported through the two points of the first and second contact portions P 1 and P 2 in the vertical relationship. Can be cantilevered in a stable posture.
Further, since the distance between the first and second contact portions P 1 and P 2 is separated in the height direction, the load can be distributed not only to the cantilever hook 20 but also to the hook stand 50, so It is not necessary to concentrate excessive stress on the part.
Furthermore, since the cantilever scaffold 30 can be supported at two points spaced apart in the height direction, the protruding length of the cantilever hook 20 can be kept low.

［張出通路の撤去方法］
張出通路１０を撤去する場合は、既述した設置方法と逆の作業工程で簡単に行うことができる。
すなわち、連結ピン５６を取り除いた状態で張出足場１０をクレーンで吊り上げて撤去するだけの簡単な作業で張出通路１０を撤去できる。
フックスタンド５０は撤去してもよいが、撤去せずに残置させた複数のフックスタンド５０間に図示しない高欄用の支柱を差し込んで既設の床板４２用の高欄を形成してもよい。
本発明では張出通路１０の設置作業だけでなく、張出通路１０の撤去作業も安全で、かつ短時間に行える [How to remove the overhang passage]
In the case of removing the overhang passage 10, it can be easily performed by an operation process reverse to the installation method described above.
That is, the overhanging passage 10 can be removed with a simple operation of lifting the overhanging scaffold 10 with a crane and removing the connecting pin 56.
Although the hook stand 50 may be removed, a rail for the existing floor board 42 may be formed by inserting a column for a rail not shown between the plurality of hook stands 50 left without being removed.
In the present invention, not only the installation work of the overhang passage 10 but also the removal work of the overhang passage 10 can be performed safely and in a short time.

［張出通路の転用性について］
本発明に係る張出通路１０は、片持フック２０の着脱が容易であり、ユニット化した片持足場３０の設置と解体が容易である。
したがって、撤去した片持フック２０や片持足場３０の次工区への転用が簡単に行える。 [About diversion of overhang passage]
In the overhang passage 10 according to the present invention, the cantilever hooks 20 can be easily attached and detached, and the unitized cantilever scaffold 30 can be easily installed and disassembled.
Accordingly, the removed cantilever hook 20 and cantilever scaffold 30 can be easily transferred to the next work area.

１０・・・張出通路
２０・・・片持フック
２１・・・片持フックの横断部
２２・・・片持フックの起立部
２３・・・片持フックの水平部
２４・・・片持フックの嵌合部
３０・・・片持足場
３１・・・足場板
３２・・・足場板の切欠
３３・・・足場板の幅木
３４・・・足場板の高欄
４０・・・鉄骨構造物
４１・・・鉄骨構造物の桁材
４２・・・鉄骨構造物の床板
５０・・・フックスタンド
５１・・・フックスタンドの傾斜部
５２・・・フックスタンドの基板
５３・・・フックスタンドの当板
５４・・・フックスタンドの補強板
５５・・・フックスタンドの嵌合部
５６・・・連結ピン DESCRIPTION OF SYMBOLS 10 ... Overhang passage 20 ... Cantilever hook 21 ... Cantilever hook transverse part 22 ... Cantilever hook standing part 23 ... Cantilever hook horizontal part 24 ... Cantilever Hook fitting part 30 ... cantilevered scaffold 31 ... scaffolding board 32 ... notch 33 in scaffolding board ... baseboard 34 in scaffolding board ... railing 40 in scaffolding board ... steel structure 41 ... Steel structure girder 42 ... Steel structure floor plate 50 ... Hook stand 51 ... Hook stand inclined part 52 ... Hook stand substrate 53 ... Hook stand contact Plate 54 ... Hook stand reinforcement plate 55 ... Hook stand fitting portion 56 ... Connecting pin

Claims (8)

床板を敷設した鉄骨構造物の最上位の桁材の側方に増設する張出通路であって、
一側に複数の切欠を形成した足場板と、該足場板の切欠に面して上向きに突設した鉤形を呈する複数の片持フックとを有する片持足場と、
前記最外側の桁材に立設し、前記片持フックと嵌合可能な複数のフックスタンドとを具備し、
前記フックスタンドが具備する嵌合部と、前記片持フックが具備する嵌合部とを嵌合させて前記片持足場を鉄骨構造物の桁材に片持ちで支持させたことを特徴とする、
鉄骨構造物の張出通路。 It is an overhang passage that is added to the side of the uppermost girders of a steel structure laid with floorboards,
A cantilevered scaffold having a scaffolding plate formed with a plurality of notches on one side, and a plurality of cantilevered hooks that project upwardly facing the notches of the scaffolding plate,
Standing on the outermost girders, comprising a plurality of hook stands that can be fitted to the cantilever hooks,
A fitting portion provided in the hook stand and a fitting portion provided in the cantilever hook are fitted to support the cantilever scaffold on a girder of a steel structure in a cantilever manner. ,
Overhang passage of steel structure. 前記片持フックに当接させたフックスタンドの上端部および中間部の二つの当接部を介して片持足場をフックスタンドに片持ちで支持させたことを特徴とする、請求項１に記載の鉄骨構造物の張出通路。   The cantilever scaffold is supported by the hook stand in a cantilever manner through two abutting portions of an upper end portion and an intermediate portion of the hook stand abutted on the cantilever hook. Overhang passage of steel structure. 前記フックスタンドは、前記最外側の桁材の外方へ向けて傾斜する傾斜部と、該傾斜部の先端から鉛直に向けて延設し、片持フックの挿嵌部と嵌合可能な嵌合部とを具備することを特徴とする、請求項１または２に記載の鉄骨構造物の張出通路。   The hook stand includes an inclined portion that inclines toward the outside of the outermost beam member, and a fitting that extends vertically from the tip of the inclined portion and can be fitted to the insertion portion of the cantilever hook. The overhang passage of a steel structure according to claim 1 or 2, further comprising a joint portion. 前記最外側の桁材と片持フックの起立部との間に間隙を形成するように、前記フックスタンドが略く字形を呈することを特徴とする、請求項１乃至３の何れか一項に記載の鉄骨構造物の張出通路。   4. The hook stand according to any one of claims 1 to 3, wherein the hook stand has a substantially square shape so as to form a gap between the outermost beam member and the upright portion of the cantilever hook. Overhang passage of the steel structure described. 足場板の切欠が前記フックスタンドを収容可能な開口幅であり、該切欠内に収容したフックスタンドが切欠空間を閉鎖する寸法関係にあることを特徴とする、請求項１乃至４の何れか一項に記載の鉄骨構造物の張出通路。   The cutout of the scaffold plate has an opening width capable of accommodating the hook stand, and the hook stand received in the cutout has a dimensional relationship for closing the cutout space. The overhang passage of the steel structure given in the paragraph. 前記片持フックは足場板を横断する横断部と、横断部の一端から真上に延設した起立部と、起立部の一端から水平に延設した水平部と、水平部の端部から真下に延設した嵌合部とを有することを特徴とする、請求項１乃至４の何れか一項に記載の鉄骨構造物の張出通路。   The cantilever hook includes a transverse part that crosses the scaffolding plate, an upright part that extends directly from one end of the transverse part, a horizontal part that extends horizontally from one end of the upright part, and directly below the end part of the horizontal part. The overhanging passage for a steel structure according to any one of claims 1 to 4, further comprising a fitting portion that extends to the fitting portion. 切欠を介して足場板の上方へ突出する片持フックの起立部の突出長が、前記フックスタンドおよび片持フックが具備する両嵌合部を嵌合させたときに、足場板の上面が該足場板と隣り合う鉄骨構造物の床板の上面と面一となる寸法関係にあることを特徴とする、請求項６に記載の鉄骨構造物の張出通路。   When the protruding length of the upright portion of the cantilever hook that protrudes upward from the scaffolding plate through the notch is fitted into the both fitting portions of the hook stand and the cantilever hook, the upper surface of the scaffolding plate is The overhang passage for a steel structure according to claim 6, wherein the overhang passage has a dimensional relationship that is flush with an upper surface of a floor plate of the steel structure adjacent to the scaffold plate. 鉄骨構造物が仮橋、仮桟橋、構台等の仮設鉄骨構造物であることを特徴とする、請求項１乃至７の何れか一項に記載の鉄骨構造物の張出通路。   The steel structure overhang passage according to any one of claims 1 to 7, wherein the steel structure is a temporary steel structure such as a temporary bridge, a temporary pier, or a gantry.
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