JP6560774B1

JP6560774B1 - Scaffolding construction method

Info

Publication number: JP6560774B1
Application number: JP2018030647A
Authority: JP
Inventors: 勇樹佐藤; 佐々木　健一; 健一佐々木; 秀文春日; 暁伸渡邊; 公一吉村
Original assignee: Nisso Industries Co Ltd
Current assignee: Nisso Industries Co Ltd
Priority date: 2018-02-23
Filing date: 2018-02-23
Publication date: 2019-08-14
Anticipated expiration: 2038-02-23
Also published as: JP2019143431A

Abstract

【課題】台船を用いることなく、水域上に架設される橋梁の橋脚の周囲に作業足場を構築する足場構築工法を提供することを目的とする。【解決手段】橋梁の一側の陸地から目的の橋脚１に向かう搬入路８を橋梁に吊設形成し、この搬入路８に連設させて作業足場４を橋梁に吊設形成すると共に、この作業足場４を形成する際に、複数の梁部材11と、この梁部材11が水平回動自在且つ着脱自在に連結される梁連結部材12と、梁部材11と梁連結部材12との連結回動軸となる連結保持軸13を備え、梁部材11の軸挿通孔14と、梁連結部材12の軸挿通孔15とを連通状態にし、この軸挿通連通孔に連結保持軸13を挿入配設して組み立てる折り畳み分解自在な足場形成部２を用いる。【選択図】図１An object of the present invention is to provide a scaffold construction method for constructing a work scaffold around a pier of a bridge constructed on a water area without using a carriage. A loading path 8 from a land on one side of a bridge to a target pier 1 is suspended from the bridge, and a work scaffold 4 is suspended from the bridge by connecting to the loading path 8. When forming the work scaffold 4, a plurality of beam members 11, a beam connecting member 12 to which the beam members 11 are connected horizontally and detachably, and a connection circuit between the beam member 11 and the beam connecting member 12. It is provided with a connecting and holding shaft 13 that is a dynamic shaft, and the shaft insertion hole 14 of the beam member 11 and the shaft insertion hole 15 of the beam connecting member 12 are in communication with each other, and the connection holding shaft 13 is inserted and disposed in this shaft insertion communication hole Thus, the folding and disassembling scaffold forming part 2 is used. [Selection] Figure 1

Description

本発明は、水域上に架設される橋梁の橋脚の周囲に吊り足場を用いて作業足場を構築する足場構築工法に関するものである。 The present invention relates to a scaffold construction method for constructing a work scaffold using a suspension scaffold around a pier of a bridge constructed on a water area.

河川、海、湖等の水域上に架設される橋梁の橋脚を補修・補強工事を行うためには、この橋脚の周囲に作業用のドライエリアを形成する必要があり、従来、このドライエリアを形成する工法として、仮締切り工法が知られている。 In order to repair and reinforce the piers of bridges built on water areas such as rivers, seas, lakes, etc., it is necessary to form a dry work area around these piers. A temporary closing method is known as a forming method.

この仮締切り工法は、橋脚の周囲に鋼板等で形成される仮締切り構造体を設置して橋脚と水域を仕切り、この仮締切り構造体内の水を排水して橋脚の周囲にドライエリアを形成するものである。 In this temporary closing method, a temporary closing structure formed of steel plates or the like is installed around the pier to partition the pier and the water area, and the water in the temporary closing structure is drained to form a dry area around the pier. Is.

従来、この仮締切り工法を用いて橋脚の補修・補強工事を行う場合、陸地から目的の橋脚まで台船を設置し、この台船を介して目的の橋脚への行き来を行い、橋脚の周囲に作業足場を構築し、この作業足場を利用して仮締切り構造体の構築・設置を行っている。 Conventionally, when repairing / reinforcing piers using this temporary closing method, a pontoon is installed from the land to the target pier, and the target pier is moved to and from the pier around the pier. A working scaffold is constructed, and a temporary closing structure is constructed and installed using this working scaffold.

しかしながら、この台船は、多数の非常に大きなパーツを連結して形成するものであるため、現場までの輸送に多大な労力と費用を要し、更に、この台船を用いる場合は、設置水域にある程度の深さが必要であるため、水深が浅い水域では使用することができない問題があった。 However, since this trolley is formed by connecting a large number of very large parts, it requires a lot of labor and cost for transportation to the site. Therefore, there is a problem that it cannot be used in a shallow water area.

本発明は、このような現状の問題に鑑みなされたもので、台船を用いることなく、水域上に架設される橋梁の橋脚の周囲に作業足場を構築する足場構築工法を提供することを目的とする。 The present invention has been made in view of such current problems, and an object of the present invention is to provide a scaffold construction method for constructing a work scaffold around a pier of a bridge constructed on a water area without using a carriage. And

添付図面を参照して本発明の要旨を説明する。 The gist of the present invention will be described with reference to the accompanying drawings.

水域上に架設される橋梁の橋脚１の周囲に作業足場４を構築する足場構築工法において、前記橋梁の一側の陸地若しくは前記陸地に設けられる搬入部９から前記橋脚１に向かう搬入路８を前記橋梁に吊設形成し、この搬入路８に連設させて前記作業足場４を前記橋梁に吊設形成し、この作業足場４は、複数の折り畳み分解式足場形成枠体10を連設して形成する構成とされ、この折り畳み分解式足場形成枠体10は、複数の梁部材11、この梁部材11の端部が水平回動自在且つ着脱自在に連結される梁連結部材12及び前記梁部材11の回動軸となると共にこの梁部材11と前記梁連結部材12との連結を保持する連結保持軸13を備え、前記梁部材11の端部に設けられている軸挿通孔14と、前記梁連結部材12に設けられている軸挿通孔15とを連通状態にして軸挿通連通孔を形成し、この軸挿通連通孔に前記連結保持軸13を挿入配設することで組み立て形成することができ、この組み立て形成された状態で前記軸挿通連通孔に挿通配設されている前記連結保持軸13を抜き取ることで前記梁連結部材12から前記梁部材11を分離して撤去することができるように構成されていることを特徴とする足場構築工法に係るものである。 In a scaffold construction method for constructing a work scaffold 4 around a pier 1 of a bridge constructed on a water area, a carry-in path 8 from the land on one side of the bridge or a carry-in portion 9 provided on the land to the pier 1 is provided. The work scaffold 4 is suspended from the bridge and connected to the carry-in path 8 to suspend the work scaffold 4 from the bridge. The work scaffold 4 includes a plurality of folding and disassembling scaffold forming frames 10 connected in series. This folding and disassembling scaffold forming frame 10 includes a plurality of beam members 11, a beam connecting member 12 in which end portions of the beam members 11 are connected to be horizontally rotatable and detachable, and the beam. The shaft 11 is provided with a connection holding shaft 13 that serves as a rotation shaft of the member 11 and holds the connection between the beam member 11 and the beam connection member 12, and a shaft insertion hole 14 provided at an end of the beam member 11, The shaft insertion hole 15 provided in the beam connecting member 12 is in communication with the shaft insertion hole 15. A hole can be formed and assembled by inserting and connecting the connection holding shaft 13 to the shaft insertion communication hole, and the shaft insertion communication hole is inserted into the shaft insertion communication hole in the assembled state. The present invention relates to a scaffold construction method characterized in that the beam member 11 can be separated and removed from the beam connecting member 12 by extracting the connection holding shaft 13.

また、前記搬入路８は、前記橋梁の橋桁６に吊設することを特徴とする請求項１記載の足場構築工法に係るものである。 2. The scaffold construction method according to claim 1, wherein the carry-in path 8 is suspended from a bridge girder 6 of the bridge.

また、前記搬入路８は、複数の前記折り畳み分解式足場形成枠体10を連設して形成することを特徴とする請求項１，２のいずれか１項に記載の足場構築工法に係るものである。 Further, the carry-in path 8 is formed by connecting a plurality of the folding and disassembling-type scaffold forming frame bodies 10 according to any one of claims 1 and 2, It is.

また、前記搬入路８の端部に、前記梁部材11と前記梁連結部材12と前記連結保持軸13により折り畳み状態にした折り畳み分解式足場形成枠体10を組み付け形成し、この折り畳み状態で組み付け形成した折り畳み分解式足場形成枠体10を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体10に足場板16を敷設して足場形成部２を形成すると共に、前記折り畳み分解式足場形成枠体10に更に前記梁部材11と前記梁連結部材12と前記連結保持軸13により折り畳み状態にした折り畳み分解式足場形成枠体10を組み付け形成し、この折り畳み状態で組み付け形成した折り畳み分解式足場形成枠体10を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体10に足場板16を敷設して足場形成部２を形成して、前記足場形成部２で形成される足場形成域を順次拡張形成して前記作業足場４を形成することを特徴とする請求項１〜３のいずれか１項に記載の足場構築工法に係るものである。 In addition, a folding and disassembling scaffold forming frame 10 that is folded by the beam member 11, the beam connecting member 12, and the connection holding shaft 13 is assembled and formed at the end of the carry-in path 8, and assembled in this folded state. The formed folding / disassembling scaffold forming frame 10 is horizontally rotated to be in an unfolded state, and the scaffold plate 16 is laid on the unfolded folding / disassembling scaffold forming frame 10 to form the scaffold forming portion 2; The folding and disassembling scaffold forming frame 10 is further assembled and formed with the folding and disassembling scaffold forming frame 10 which is folded by the beam member 11, the beam connecting member 12 and the connection holding shaft 13, and is assembled in this folded state. The formed folding / disassembling scaffold forming frame 10 is horizontally rotated to be in an unfolded state, and the scaffolding plate 16 is laid on the unfolded folding / disassembling scaffold forming frame 10 to form the scaffold forming portion 2; Said scaffold Those of the scaffold construction method according to any one of claims 1 to 3, characterized in that to form the working scaffold 4 scaffolding area which is formed by sequentially expanded form in generating unit 2.

また、前記折り畳み分解式足場形成枠体10に足場板16を敷設して形成した足場形成部２に、更に前記梁部材11と前記梁連結部材12と前記連結保持軸13により折り畳み状態にした折り畳み分解式足場形成枠体10を組み付け形成し、この折り畳み状態で組み付け形成した折り畳み分解式足場形成枠体10を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体10に足場板16を敷設して足場形成部２を形成して、前記足場形成部２で形成される足場形成域を順次拡張形成して前記搬入路８を形成することを特徴とする請求項１〜４のいずれか１項に記載の足場構築工法に係るものである。 Further, the scaffold forming portion 2 formed by laying a scaffold plate 16 on the folding and disassembling scaffold forming frame 10 is further folded by the beam member 11, the beam connecting member 12 and the connection holding shaft 13. The disassembled scaffold-forming frame 10 is assembled and formed, and the folded and disassembled scaffold-forming frame 10 assembled and formed in this folded state is horizontally rotated to the unfolded state. The scaffolding plate 16 is laid to form the scaffold forming portion 2, and the scaffold forming area formed by the scaffold forming portion 2 is sequentially expanded to form the carry-in path 8. The scaffold construction method according to any one of -4.

本発明は上述のようにするから、台船を用いることなく、水域上に架設される橋梁の橋脚の周囲に作業足場を構築することができ、これにより、台船を現場まで輸送する際に発生する多大な労力と費用を削減することができるので、例えば、仮締切り工法を用いて橋脚の補修・補強工事を行う場合、簡易に且つコスト安に橋脚の補修・補強工事を行うことができる。 Since the present invention is as described above, it is possible to construct a work scaffold around the pier of a bridge constructed on the water area without using a trolley. Since a great deal of labor and costs can be reduced, for example, when repairing / reinforcing piers using the temporary closing method, repairing / reinforcing piers can be performed easily and at low cost. .

更に、本発明は、陸地と作業足場が搬入路を介して連設されているから、作業者は歩いて容易に作業足場まで行けるので、作業に必要な資材や部材を小パーツ化することで、これらを作業者自身が作業足場まで運搬することができるようになり、これにより、クレーン等の重機の使用が不要となり、更なるコスト低減を図ることができる。 Furthermore, since the land and the work platform are continuously connected via the carry-in route according to the present invention, the worker can easily go to the work platform by walking, so the materials and members necessary for the work can be made into small parts. These can be transported to the work scaffold by the operator himself, thereby making it unnecessary to use heavy equipment such as a crane and further reducing costs.

しかも、本発明は、作業足場を形成する際に、組立・撤去が容易な折り畳み分解式足場形成枠体を連設して作業足場を形成するから、足場形成作業が簡易化され、これにより、作業性が向上して、工期の短縮化を図ることができる。 Moreover, when forming the work scaffold, the present invention forms the work scaffold by connecting the folding and disassembling scaffold forming frame body that is easy to assemble and remove, thereby simplifying the scaffold formation work, Workability is improved and the construction period can be shortened.

本実施例における本工法施工前状態を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the state before this construction method construction in a present Example. 本実施例における本工法の施工手順（搬入路形成工程及び作業足場形成工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (carrying path formation process and work scaffold formation process) of this construction method in a present Example. 本実施例における本工法の施工手順（作業足場吊り替え工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (work scaffold suspension process) of this construction method in a present Example. 本実施例における本工法の施工手順（作業足場吊り替え工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (work scaffold suspension process) of this construction method in a present Example. 本実施例における本工法の施工手順（作業足場吊り替え工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (work scaffold suspension process) of this construction method in a present Example. 本実施例における本工法の施工手順（作業足場吊り替え工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (work scaffold suspension process) of this construction method in a present Example. 本実施例における本工法の施工手順（作業足場吊り替え工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (work scaffold suspension process) of this construction method in a present Example. 本実施例における本工法の施工手順（仮締切り構造体構築・設置工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (temporary deadline structure construction and installation process) of this construction method in a present Example. 本実施例における本工法の施工手順（仮締切り構造体構築・設置工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (temporary deadline structure construction and installation process) of this construction method in a present Example. 本実施例における本工法の施工手順（仮締切り構造体構築・設置工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (temporary deadline structure construction and installation process) of this construction method in a present Example. 本実施例における本工法の施工手順（仮締切り構造体構築・設置工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (temporary deadline structure construction and installation process) of this construction method in a present Example. 本実施例における本工法の施工手順（仮締切り構造体構築・設置工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (temporary deadline structure construction and installation process) of this construction method in a present Example. 本実施例における本工法の施工手順（仮締切り構造体構築・設置工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (temporary deadline structure construction and installation process) of this construction method in a present Example. 本実施例における本工法の施工手順（作業用ドライエリア形成工程）を示す（ａ）説明図正断面図及び（ｂ）説明側面図である。It is (a) explanatory drawing front sectional view and (b) explanatory side view which show the construction procedure (working dry area formation process) of this construction method in a present Example. 本実施例における吊り足場を示す説明分解斜視図である。It is a description disassembled perspective view which shows the suspension scaffold in a present Example. 本実施例における本工法の搬入路及び作業足場を形成する際の作業手順を示す説明図であり、（ａ）は折り畳み分解式足場形成枠体を折り畳み状態で組付けた状態を示す図、（ｂ）は折り畳み状態で組付けた折り畳み分解式足場形成枠体を展開操作した状態を示す図、（ｃ）は展開した折り畳み分解式足場形成枠体に足場板を敷設した状態を示す図である。It is explanatory drawing which shows the work procedure at the time of forming the carrying-in route and work scaffold of this construction method in a present Example, (a) is a figure which shows the state assembled | attached in the folding state by the folding decomposition | disassembly type | formula scaffold formation frame ( b) is a diagram showing a state in which a folding and disassembling scaffold forming frame body assembled in a folded state is unfolded, and (c) is a diagram showing a state in which a scaffold plate is laid on the unfolding folding and dismantling scaffold forming frame. . 本実施例の受替え梁を示す側面図である。It is a side view which shows the replacement beam of a present Example. 本実施例の作業足場を示す説明平面図である。It is an explanatory top view which shows the work scaffold of a present Example. 本実施例の作業足場に開口部を形成した状態を示す説明平面図である。It is an explanatory top view which shows the state which formed the opening part in the working scaffold of a present Example.

好適と考える本発明の実施形態を、図面に基づいて本発明の作用を示して簡単に説明する。 An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

本発明は、河岸等の陸地から、若しくはこの陸地に設けられた搬入部９（例えば櫓状、階段状、スロープ状の足場等）から目的の橋脚１に向かって、橋梁の橋桁６に沿って搬入路８を吊設して延設形成すると共に、この搬入路８と連設する作業足場４を吊設形成するから、作業者は、陸地と作業足場４とを搬入路８を介して容易に行き来することができ、これにより、陸地と目的の橋脚１との間に設置する台船が不要になり、この台船を現場まで輸送する際に発生する多大な労力と費用を削減することができる。 In the present invention, along a bridge girder 6 from a land such as a river bank or from a carry-in portion 9 (for example, a saddle-like, step-like, slope-like scaffold) provided on the land toward a target pier 1. Since the carry-in path 8 is suspended and formed and the work scaffold 4 connected to the carry-in path 8 is suspended, the operator can easily connect the land and the work scaffold 4 via the carry-in path 8. This eliminates the need for a trolley installed between the land and the target pier 1 and reduces the significant labor and costs incurred when transporting this craft to the site. Can do.

従って、例えば、橋脚の補修・補強工事を行う際に本発明を用いて仮締切り工法を行えば、橋脚の補修・補強工事を、簡易に且つコスト安に行うことができる。 Therefore, for example, if the temporary closing method is performed using the present invention when repairing / reinforcing a pier, repairing / reinforcing the pier can be performed easily and at low cost.

また、搬入路８を介して陸地と作業足場４を容易に行き来することができることで、例えば、作業に必要な資材や部材を小パーツ化することで、これらを作業者自身が持って作業足場４まで運べるので、クレーン等の重機の使用が不要となり、よりコストの低減が図れる。 Moreover, since the land and the work scaffold 4 can be easily moved back and forth via the carry-in path 8, for example, by making the parts and materials necessary for the work into small parts, the worker himself has these work scaffolds. Since it can be transported to 4, it is not necessary to use heavy machinery such as cranes, and costs can be further reduced.

また、本発明は、搬入路８に連設させて作業足場４を橋梁に吊設形成する際に、複数の梁部材11、この梁部材11の端部が水平回動自在且つ着脱自在に連結される梁連結部材12及び梁部材11の回動軸となると共にこの梁部材11と梁連結部材12との連結を保持する連結保持軸13を備え、梁部材11の端部に設けられている軸挿通孔14と、梁連結部材12に設けられている軸挿通孔15とを連通状態にして軸挿通連通孔を形成し、この軸挿通連通孔に連結保持軸13を挿入配設することで組み立て形成することができ、この組み立て形成された状態で軸挿通連通孔に挿通配設されている連結保持軸13を抜き取ることで梁連結部材12から梁部材11を分離して撤去することができるように構成される折り畳み分解式足場形成枠体10を複数連設して形成するから、作業足場の形成・撤去の作業が容易になり、作業性が向上して、工期の短縮化が図れ、これにより、よりコストの低減が図れる。 Further, according to the present invention, when the work scaffold 4 is suspended from the bridge by connecting to the carry-in path 8, the plurality of beam members 11 and the ends of the beam members 11 are connected to each other so as to be horizontally rotatable and detachable. The beam connection member 12 and the beam member 11 are provided with a connection holding shaft 13 that serves as a rotation axis of the beam member 11 and holds the connection between the beam member 11 and the beam connection member 12, and is provided at the end of the beam member By connecting the shaft insertion hole 14 and the shaft insertion hole 15 provided in the beam connecting member 12 to form a shaft insertion communication hole, the connection holding shaft 13 is inserted and disposed in the shaft insertion communication hole. The beam member 11 can be separated and removed from the beam connecting member 12 by removing the connection holding shaft 13 inserted and disposed in the shaft insertion communication hole in this assembled and formed state. Since a plurality of folding and disassembling scaffold forming frames 10 configured as shown in FIG. It facilitates the work of forming and removal, improved workability, Hakare to shorten the construction period, thereby, more cost reduction can be achieved.

本発明の具体的な実施例について図面に基づいて説明する。 Specific embodiments of the present invention will be described with reference to the drawings.

本実施例は、橋脚の補修・補強工事における仮締切り構造体を用いた作業用ドライエリアの形成工法に、本発明の足場構築工法を用いた場合である。 In this embodiment, the scaffold construction method of the present invention is used as a method for forming a work dry area using a temporary closing structure in repair / reinforcement work of a pier.

具体的には、本実施例は、水域上に架設される橋梁の工事対象の橋脚１の周囲に仮締切り構造体３を構築するための作業足場４を前記橋梁に吊設形成し、この作業足場４上に前記橋脚１を囲繞するように仮締切り構造体３を構築し、この構築した仮締切り構造体３を前記作業足場４に形成した開口部５を介して降下させて水域中に配置した後、前記仮締切り構造体３の底部の橋脚貫通孔と前記橋脚１との間を止水し、前記仮締切り構造体３内に入り込んだ水を排水して該仮締切り構造体３内に作業用ドライエリアを形成する橋脚補修・補強工事における仮締切り構造体を用いた作業用ドライエリアの形成工法（以下、本工法と称す。）に関するものである。 Specifically, in this embodiment, a work scaffold 4 for constructing a temporary cutoff structure 3 around a bridge pier 1 to be constructed on a bridge constructed on a water area is suspended from the bridge, and this work is performed. A temporary fastening structure 3 is constructed on the scaffold 4 so as to surround the pier 1, and the constructed temporary fastening structure 3 is lowered through an opening 5 formed in the working scaffold 4 and placed in the water area. After that, water is stopped between the pier through hole at the bottom of the temporary closing structure 3 and the pier 1, and the water that has entered the temporary closing structure 3 is drained to enter the temporary closing structure 3. The present invention relates to a method for forming a work dry area (hereinafter referred to as the present method) using a temporary closing structure in a pier repair / reinforcement work that forms the work dry area.

より具体的には、本工法には、搬入路形成工程、作業足場形成工程、作業足場吊り替え工程、仮締切り構造体構築・設置工程、作業用ドライエリア形成工程があり、先ず、最初に、搬入路形成工程及び作業足場形成工程にて、橋梁の一側の陸地若しくは陸地に設けられる搬入部９に連設する足場形成部２、具体的には吊り足場２を、橋梁の橋桁６に沿って工事対象の橋脚１まで延設し、この橋桁６に吊設された吊り足場２により搬入路８と、この搬入路８に連設する仮締切り構造体３を構築するための作業足場４を形成し、次いで、作業足場吊り替え工程にて、前記橋脚１に受替え梁７を設け、作業足場４を形成する吊り足場２を橋桁６から前記受替え梁７に吊り替え吊設し、次いで、仮締切り構造体構築・設置工程にて、この受替え梁７に吊り替え吊設した吊り足場２で形成される前記作業足場４上で仮締切り構造体３を構築した後、作業足場４に開口部５を形成し、この開口部５を介して仮締切り構造体３を降下させて水域中に配置し、最後の作業用ドライエリア形成工程にて、仮締切り構造体３の底部の橋脚貫通孔と橋脚１との間を止水し、仮締切り構造体３内に入り込んだ水を排水して、この仮締切り構造体３内に作業用のドライエリアを形成するものである。 More specifically, the construction method includes a carry-in path formation process, a work scaffold formation process, a work scaffold suspension process, a temporary closing structure construction / installation process, and a work dry area formation process. In the carry-in route formation process and the work scaffold formation process, the scaffold formation part 2 connected to the land on one side of the bridge or the carry-in part 9 provided on the land, specifically the suspension scaffold 2, along the bridge girder 6 of the bridge A work scaffold 4 for constructing a carry-in path 8 and a temporary fastening structure 3 connected to the carry-in path 8 by a suspension scaffold 2 suspended from the bridge girder 6 and extending to the pier 1 to be constructed. Then, in the work scaffold suspension step, the bridge pier 1 is provided with a replacement beam 7, the suspension scaffold 2 forming the work scaffold 4 is suspended from the bridge girder 6 to the replacement beam 7, and then In the process of constructing and installing the temporary cutoff structure, After constructing the temporary cut-off structure 3 on the work scaffold 4 formed by the suspended scaffold 2 suspended, the opening 5 is formed in the work scaffold 4 and the temporary cut-off structure is formed through the opening 5. 3 is lowered and placed in the water area, and in the final work dry area forming step, water is stopped between the pier through hole at the bottom of the temporary closing structure 3 and the pier 1, and the temporary closing structure 3 The entered water is drained to form a working dry area in the temporary cut-off structure 3.

以下、本工法の各工程について、施工手順に沿って具体的に説明する。 Hereinafter, each process of this construction method will be specifically described along the construction procedure.

（１）搬入路形成工程
本工法における搬入路形成工程とは、橋梁の一側の陸地若しくは陸地に設けられる搬入部９と作業足場４とを結ぶ搬入路８（通路）を形成する工程である。尚、本実施例では、搬入部９を設置する場合について説明する。 (1) Loading path formation process The loading path forming process in this construction method is a process of forming a loading path 8 (passage) connecting the loading area 9 provided on one side of the bridge or the landing site provided on the land. . In the present embodiment, a case where the carry-in unit 9 is installed will be described.

具体的には、搬入路８の形成は、先ず、河川の一側の河岸に搬入部９（例えば櫓状、階段状、スロープ状の足場等）を設置し、この搬入部９に連設させて目的の橋脚１（工事対象の橋脚１）に向かう搬入路８の延設形成してゆく。 Specifically, in the formation of the carry-in path 8, first, a carry-in part 9 (for example, a saddle-like, stepped, slope-like scaffold, etc.) is installed on the river bank on one side of the river, and is connected to this carry-in part 9. Then, an extension of the carry-in route 8 toward the target pier 1 (the pier 1 to be constructed) is formed.

より具体的には、搬入路８は、橋梁の橋桁６に複数の吊り足場２を吊設して、この橋桁６に沿って搬入路８を延設形成してゆく。 More specifically, the carry-in path 8 is formed by suspending a plurality of suspension scaffolds 2 on a bridge girder 6 and extending the carry-in path 8 along the bridge girder 6.

また、本工法では、この搬入路８を形成する吊り足場２に、折り畳み自在且つ組み立て分解自在な折り畳み分解式足場形成枠体10と、この折り畳み分解式足場形成枠体10に敷設する足場板16とで形成される吊り足場２を用いる。 Further, in this construction method, a folding and disassembling scaffold forming frame 10 that is foldable and can be assembled and disassembled on the suspension scaffold 2 that forms the carry-in path 8, and a scaffold plate 16 that is laid on the folding and disassembling scaffold forming frame 10. Suspended scaffold 2 formed by

具体的には、この吊り足場２を形成する折り畳み分解式足場形成枠体10は、複数（例えば四本）の梁部材11、この梁部材11の端部が水平回動自在且つ着脱自在に連結される梁連結部材12及び梁部材11の回動軸となると共にこの梁部材11と梁連結部材12との連結を保持する連結保持軸13を備え、梁部材11の端部に設けられている軸挿通孔14と、梁連結部材12に設けられている軸挿通孔15とを連通状態にして軸挿通連通孔を形成し、この軸挿通連通孔に連結保持軸13を挿入配設することで組み立て形成することができ、この組み立て形成された状態で軸挿通連通孔に挿通配設されている連結保持軸13を抜き取ることで梁連結部材12から梁部材11を分離して撤去することができるように構成されていている。 Specifically, the folding and disassembling-type scaffolding frame 10 that forms the suspension scaffold 2 includes a plurality of (for example, four) beam members 11, and ends of the beam members 11 are connected to each other so as to be horizontally rotatable and detachable. The beam connection member 12 and the beam member 11 are provided with a connection holding shaft 13 that serves as a rotation axis of the beam member 11 and holds the connection between the beam member 11 and the beam connection member 12, and is provided at the end of the beam member By connecting the shaft insertion hole 14 and the shaft insertion hole 15 provided in the beam connecting member 12 to form a shaft insertion communication hole, the connection holding shaft 13 is inserted and disposed in the shaft insertion communication hole. The beam member 11 can be separated and removed from the beam connecting member 12 by removing the connection holding shaft 13 inserted and disposed in the shaft insertion communication hole in this assembled and formed state. It is configured as follows.

即ち、本工法では、先ず、搬入部９を足場にしてこの搬入部９に、梁部材11と梁連結部材12と連結保持軸13により折り畳み状態にした折り畳み分解式足場形成枠体10を組み付け形成し、この折り畳み状態で組み付け形成した折り畳み分解式足場形成枠体10を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体10に足場板16を敷設すると共にこの折り畳み分解式足場形成枠体10に橋桁６から吊下した吊設具17（例えば足場チェーン等）を連結して、搬入路８となる最初の吊り足場２を形成し、次いで、この最初の吊り足場２を足場にしてこの最初の吊り足場２を形成している折り畳み分解式足場形成枠体10に、更に梁部材11と梁連結部材12と連結保持軸13を用いて折り畳み状態の新たな折り畳み分解式足場形成枠体10を組み付け形成し、この折り畳み状態で組み付け形成した新たな折り畳み分解式足場形成枠体10を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体10に足場板16を敷設すると共にこの折り畳み分解式足場形成枠体10に橋桁６から吊下した吊設具17を連結して最初の吊り足場２に連設される新たな吊り足場２を形成し、この新たな吊り足場２を連設する作業を繰り返して足場形成域を順次拡張形成して搬入路８を橋桁６に沿って延設形成してゆく。 That is, in this construction method, first, the carry-in part 9 is used as a scaffold, and the folding / disassembling-type scaffolding frame 10 that is folded by the beam member 11, the beam connecting member 12, and the connection holding shaft 13 is assembled to the carry-in part 9. Then, the folding / disassembling scaffold forming frame 10 assembled and formed in this folded state is horizontally rotated to the unfolded state, and the scaffold plate 16 is laid on the folding / disassembling scaffold forming frame 10 in the unfolded state and this folded A lifting tool 17 (for example, a scaffolding chain or the like) suspended from the bridge girder 6 is connected to the disassembly-type scaffolding frame 10 to form the first suspension scaffold 2 that becomes the loading path 8, and then this first suspension scaffold 2 is a folding and disassembling type scaffolding frame 10 that forms the first suspension scaffold 2 and a new folding and disassembling state using a beam member 11, a beam connecting member 12, and a connecting holding shaft 13. Assembling type scaffolding frame 10 A new folding and disassembling scaffold forming frame 10 formed and assembled in this folded state is horizontally rotated to be in a deployed state, and a scaffold plate 16 is laid on the folded and disassembled scaffold forming frame 10 in the deployed state. At the same time, a new suspension scaffold 2 connected to the first suspension scaffold 2 is formed by connecting a hanging tool 17 suspended from the bridge girder 6 to the folding and disassembling scaffold forming frame 10. The scaffold formation region is sequentially expanded by repeating the operation of connecting the two, and the carry-in path 8 is formed to extend along the bridge girder 6.

尚、この吊り足場２を用いて搬入路８を延設形成してゆく際、図示するように、搬入路８の幅方向（搬入路８の延設方向と直交する方向）に複数の折り畳み分解式足場形成枠体10を折り畳み状態で連設形成することで、いずれか一つの折り畳み分解式足場形成枠体10を水平回動操作して展開状態にすることで、連設する他の折り畳み分解式足場形成枠体10を個別に展開操作することなく、この水平回動操作した折り畳み分解式足場形成枠体10の展開動作に連動して同時に展開状態にすることができ、より効率よく吊り足場２を形成してゆくことができる。 In addition, when extending and forming the carrying-in path 8 using this suspension scaffold 2, as shown in the drawing, a plurality of folding and disassembling is performed in the width direction of the loading path 8 (direction perpendicular to the extending direction of the carry-in path 8). By separately forming one type of folding scaffolding frame 10 in a folded state, one of the other folding and disassembling type scaffolding frame 10 can be horizontally rotated to be in an unfolded state. Without having to unfold the individual scaffold-forming frame 10 separately, it can be simultaneously unfolded in conjunction with the unfolding operation of the folding and dismantling-type scaffold-forming frame 10 that has been horizontally rotated. 2 can be formed.

また、本工法では、吊り足場２同士が折り畳み分解式足場形成枠体10の一部を共有する連設構造になっているため、必ずしも全ての吊り足場２に吊設具17を連結して橋桁６から吊設した状態とする必要は無く、吊設する吊り足場２は適宜設定されるものとする。 Moreover, in this construction method, since the suspension scaffolds 2 are connected to each other and share a part of the folding and disassembling scaffold forming frame 10, the suspension fixtures 17 are not necessarily connected to all the suspension scaffolds 2 and the bridge girder. It is not necessary to suspend from 6 and the suspension scaffold 2 to be suspended is set appropriately.

（２）作業足場形成工程
本工法における作業足場形成工程とは、搬入路形成工程に次いで行われる工程で、この搬入路形成工程で形成した搬入路８に連設するようにして、工事対象の橋脚１の周囲に仮締切り構造体３を構築する際の足場となる作業足場４を形成する工程である。 (2) Work scaffold formation process The work scaffold formation process in this method is a process that is performed after the carry-in path formation process, and is connected to the carry-in path 8 formed in this carry-in path formation process. This is a process of forming a work scaffold 4 that serves as a scaffold for constructing the temporary closing structure 3 around the pier 1.

具体的には、本工法の作業足場形成工程は、前述した搬入路形成工程に用いる足場形成部２と同じ足場形成部２、具体的には吊り足場２を用いて作業足場４を形成してゆく。 Specifically, the work scaffold formation process of this construction method forms the work scaffold 4 using the same scaffold formation part 2 as the scaffold formation part 2 used in the carry-in path formation process described above, specifically, the suspended scaffold 2. go.

より具体的には、先に形成した搬入路８の端部、具体的には、搬入路８を形成している吊り足場２の折り畳み分解式足場形成枠体10の端部に、この搬入路８を足場にして、前述の作業足場形成工程での作業と同様、梁部材11と梁連結部材12と連結保持軸13により折り畳み状態の折り畳み分解式足場形成枠体10を組み付け形成し、この折り畳み状態で組み付け形成した折り畳み分解式足場形成枠体10を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体10に足場板16を敷設すると共にこの折り畳み分解式足場形成枠体10に橋桁６から吊下した吊設具17を連結して、作業足場４となる最初の吊り足場２を形成し、次いで、この最初の吊り足場２を足場にしてこの最初の吊り足場２を形成している折り畳み分解式足場形成枠体10に、更に梁部材11と梁連結部材12と連結保持軸13を用いて折り畳み状態の新たな折り畳み分解式足場形成枠体10を組み付け形成し、この折り畳み状態で組み付け形成した新たな折り畳み分解式足場形成枠体10を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体10に足場板16を敷設すると共にこの折り畳み分解式足場形成枠体10に橋桁６から吊下した吊設具17を連結して最初の吊り足場２に連設される新たな吊り足場２を形成し、この新たな吊り足場２を連設する作業を繰り返して足場形成域を順次拡張形成して作業足場４を形成してゆく。 More specifically, the carry-in path is formed at the end of the carry-in path 8 formed earlier, specifically, at the end of the folding and disassembling scaffold forming frame 10 of the suspension scaffold 2 forming the carry-in path 8. 8 is used as a scaffold, and the folding and disassembling type scaffold forming frame 10 is assembled and formed by the beam member 11, the beam connecting member 12, and the connection holding shaft 13 in the same manner as the work in the above-described work scaffold forming step. The folding and disassembling scaffold forming frame 10 assembled and formed in the state is horizontally rotated to the unfolded state, and the folding plate 16 is laid on the unfolded folding and disassembling scaffold forming frame 10 and the folding and disassembling scaffold is formed. A suspension tool 17 suspended from the bridge girder 6 is connected to the frame body 10 to form the first suspension scaffold 2 to be the work scaffold 4, and then the first suspension scaffold 2 is used as the scaffold. 2 to the folding and disassembling scaffolding frame 10 forming 2 Furthermore, a new folding and disassembling scaffold forming frame 10 in a folded state is assembled by using the beam member 11, the beam connecting member 12 and the connection holding shaft 13, and a new folding and disassembling scaffold formed by assembling and forming in this folded state is formed. The frame 10 is horizontally rotated to be in an unfolded state, and the scaffold plate 16 is laid on the unfolded folding / disassembling scaffold forming frame 10 and suspended from the bridge girder 6 on the folding / disassembling scaffold forming frame 10. A new suspension scaffold 2 connected to the first suspension scaffold 2 is formed by connecting the suspension tool 17, and the work for continuously connecting the new suspension scaffold 2 is repeated to sequentially form the scaffold formation area. The work scaffold 4 is formed.

尚、この作業足場形成工程においても、搬入路形成工程と同様、複数の折り畳み分解式足場形成枠体10を折り畳み状態で連設形成して、いずれか一つの折り畳み分解式足場形成枠体10を水平回動操作して、効率良く作業足場４を形成してゆくことが好ましい。 In this work scaffold formation process, similarly to the carry-in path formation process, a plurality of folding and disassembling scaffold forming frames 10 are continuously formed in a folded state, and any one folding and disassembling scaffold forming frame 10 is formed. It is preferable to form the work scaffold 4 efficiently by performing a horizontal rotation operation.

また、この本工法の作業足場形成工程では、後の作業足場吊り替え工程において、この作業足場４を上方に吊り上げ移動させる作業があるため、吊設具17として昇降機能を有するチェーンブロックを用いる。 Further, in the work scaffold forming process of this construction method, there is a work of lifting and moving the work scaffold 4 upward in the subsequent work scaffold suspending process. Therefore, a chain block having a lifting function is used as the lifting tool 17.

また、本工法で形成される作業足場４は、搬入路８と同様、吊り足場２同士が折り畳み分解式足場形成枠体10の一部を共有する連設構造になっているため、必ずしも全ての吊り足場２に吊設具を連結して橋桁６から吊設した状態とする必要は無く、吊設する吊り足場２は適宜設定されるものとする。 Moreover, since the work scaffold 4 formed by this construction method has a continuous structure in which the suspension scaffolds 2 share a part of the folding and disassembling scaffold forming frame 10 like the carry-in path 8, not all It is not necessary to connect a suspension tool to the suspension scaffold 2 and suspend the suspension scaffold 2 from the bridge girder 6, and the suspension scaffold 2 to be suspended is appropriately set.

（３）作業足場吊り替え工程
本工法における作業足場吊り替え工程とは、前述した作業足場形成工程に次いで行われる工程で、この作業足場形成工程において橋桁６に吊設形成した作業足場４を、橋脚１に設置した受替え梁７に吊り替える工程である。 (3) Work scaffold suspension process The work scaffold suspension process in this construction method is a process performed after the work scaffold formation process described above, and the work scaffold 4 suspended and formed on the bridge girder 6 in this work scaffold formation process, It is a process of suspending to the replacement beam 7 installed on the pier 1.

具体的には、作業足場吊り替え工程では、搬入路８を介して受替え梁形成部材７Ａ（受替え梁７を分解状態にしたもの）を作業足場４に搬入した後、作業足場４の一部若しくは全体を上昇させ、この上昇させた作業足場４を利用して、受替え梁形成部材７Ａを用いて受替え梁７を工事対象の橋脚１に設け、この橋脚１に設けた受替え梁７に作業足場４を形成する吊り足場２を吊り替え吊設する作業を行う。 Specifically, in the work scaffold suspending step, after the replacement beam forming member 7A (with the replacement beam 7 in a disassembled state) is carried into the work scaffold 4 via the carry-in path 8, one of the work scaffolds 4 is loaded. The replacement beam 7 is provided on the pier 1 to be constructed by using the replacement beam forming member 7A and the replacement beam provided on the pier 1 by using the raised work scaffold 4. 7 is performed to suspend and suspend the suspension scaffold 2 that forms the work scaffold 4.

より具体的には、本工法では、先ず、工事対象の橋脚１に受替え梁７（本工法ではトラス梁を採用）を設置ため、先に形成した搬入路８を介して作業者が受替え梁７を形成するための受替え梁形成部材７Ａを作業足場４まで運搬し、次いで、上昇させる作業足場４と、搬入路８や周囲の作業足場４（上昇させない作業足場４）との連設状態を解除し（切り離し操作し）、受替え梁形成部材７Ａと作業者を乗せた状態で吊設具17（チェーンブロック）を操作し作業足場４を橋脚１の上部付近まで上昇させ、この上昇させた作業足場４を足場にして受替え梁形成部材７Ａを組み立てて橋脚１上に受替え梁７を設置（載置固定）する。 More specifically, in this construction method, first, a replacement beam 7 (a truss beam is adopted in this construction method) is installed on the pier 1 to be constructed. The replacement beam forming member 7A for forming the beam 7 is transported to the work scaffold 4, and then the work scaffold 4 to be lifted is connected to the carry-in path 8 and the surrounding work scaffold 4 (work scaffold 4 that is not lifted). Release the state (separate operation), operate the lifting tool 17 (chain block) with the replacement beam forming member 7A and the operator on it, and raise the work scaffold 4 to the vicinity of the upper part of the pier 1 The replacement beam forming member 7A is assembled using the work scaffold 4 thus made as a scaffold, and the replacement beam 7 is installed (placed and fixed) on the pier 1.

次いで、この橋脚１上に設置したトラス梁からなる受替え梁７に吊設具17（チェーンブロック）を取り付け、この受替え梁７に取り付けた吊設具17を作業足場４（作業足場４を形成している吊り足場２）に連結した後、橋桁６に取り付けられている吊設具17と作業足場４との連結を解除し、作業足場４を橋桁６から受替え梁７に吊り替える。 Next, a hanging tool 17 (chain block) is attached to the replacement beam 7 made of a truss beam installed on the pier 1, and the hanging tool 17 attached to the replacement beam 7 is attached to the work scaffold 4 (work scaffold 4. After connecting to the formed suspension scaffold 2), the connection between the suspension fixture 17 attached to the bridge girder 6 and the work scaffold 4 is released, and the work scaffold 4 is suspended from the bridge girder 6 to the replacement beam 7.

吊り替えが完了したら、吊設具17を操作して作業足場４を元の高さ位置（搬入路８或いは他の作業足場４と同じ高さ位置）まで降下させて、この降下させた作業足場４と搬入路８或いは周囲の作業足場４と再び連設状態にする。 When the suspension is completed, the work scaffold 4 is lowered to the original height position (the same height position as the carry-in path 8 or other work scaffolds 4) by operating the hanging tool 17 and the lowered work scaffolds. 4 and the carry-in path 8 or the surrounding work platform 4 are connected again.

この作業足場４を橋桁６から受替え梁７に吊り替えることにより、作業足場４上に重量がある仮締切り構造体３を構築しても、橋桁６に負荷がかからないので、加重により橋梁や橋桁６に悪影響を及ぼすおそれがなくなり、安心して作業足場４上で仮締切り構造体３を構築することができる。 By suspending the work scaffold 4 from the bridge girder 6 to the replacement beam 7, even if the heavy temporary closing structure 3 is constructed on the work scaffold 4, no load is applied to the bridge girder 6. The temporary closing structure 3 can be constructed on the work scaffold 4 with peace of mind.

（４）仮締切り構造体構築・設置工程
本工法における仮締切り構造体構築・設置工程とは、前述した作業足場吊り替え工程に次いで行われる工程で、この作業足場吊り替え工程において橋桁６から橋脚１上に設置した受替え梁７に吊り替え吊設した作業足場４上で、仮締切り構造体３を構築し、この構築した仮締切り構造体３を水域中に設置する工程である。尚、本実施例では、高さが高い仮締切り構造体３を構築、設置する場合について説明する。 (4) Temporary cutoff structure construction / installation process The temporary closure structure construction / installation process in this construction method is a process that is performed after the above-described work scaffold suspension process. This is a process of constructing a temporary fastening structure 3 on a work scaffold 4 suspended from a replacement beam 7 installed on 1 and installing the constructed temporary fastening structure 3 in a water area. In addition, a present Example demonstrates the case where the temporary cutoff structure 3 with high height is constructed | assembled and installed.

本実施例のように、高さが高い仮締切り構造体３を構築する場合は、仮締切り構造体３を上下に分割して構築・設置する。 As in the present embodiment, when the temporary cutoff structure 3 having a high height is constructed, the temporary cutoff structure 3 is constructed and installed by dividing it vertically.

具体的には、先ず、仮締切り構造体３の下部側（以下、下部側仮締切り構造体３Ａと称す。）を構築し、先にこの構築した下部側仮締切り構造体３Ａを水域中に設置し、その後、仮締切り構造体３の上部側（以下、上部側仮締切り構造体３Ｂと称す。）を構築し、この構築した上部側仮締切り構造体３Ｂを、先に水域中に設置した下部側仮締切り構造体３Ａ上に載置し連結して仮締切り構造体３を構築、設置する。 Specifically, first, the lower side of the temporary fastening structure 3 (hereinafter referred to as the lower-side temporary fastening structure 3A) is constructed, and the constructed lower-side temporary fastening structure 3A is first installed in the water area. Then, the upper side of the temporary fastening structure 3 (hereinafter referred to as the upper-side temporary fastening structure 3B) is constructed, and the constructed upper-side temporary fastening structure 3B is first installed in the water area. The temporary cutoff structure 3 is constructed and installed by placing and connecting on the side temporary cutoff structure 3A.

より具体的に説明すると、本工法では、先ず、下部側仮締切り構造体３Ａを構築するため、予め作業者が手で持って運搬することができる程度の大きさに形成された下部側仮締切り構造体３Ａを形成するための底板形成部材や周壁形成部材（ライナープレート）等の下部側用の仮締切り構造体形成部材を、陸地から搬入路８を介して作業足場４まで作業者が持ち運び搬入する。このように搬入を全て人力で行うことでコストを削減することができる。 More specifically, in this construction method, first, in order to construct the lower-side temporary cutoff structure 3A, the lower-side temporary cutoff that is formed in a size that can be carried and held by an operator in advance by hand. A worker carries and carries a temporary cut-off structure forming member for a lower side such as a bottom plate forming member and a peripheral wall forming member (liner plate) for forming the structure 3A from the land to the work scaffold 4 via the loading path 8. To do. Thus, cost can be reduced by carrying in all by human power.

次いで、この作業足場４に搬入した下部側用の仮締切り構造体形成部材を、作業足場４上で組み立てて下部側仮締切り構造体３Ａを構築する。 Next, the lower-side temporary cutoff structure forming member carried into the work scaffold 4 is assembled on the work scaffold 4 to construct the lower-side temporary cutoff structure 3A.

具体的には、先ず、作業足場４上に、工事対象の橋脚１を囲繞するように平面視リング状の底板部を形成し、この底板部の外周縁部に沿って所定高さの周壁部を立設形成して、有底筒状の下部側仮締切り構造体３Ａを構築する。 Specifically, first, a ring-shaped bottom plate portion in plan view is formed on the work scaffold 4 so as to surround the pier 1 to be constructed, and a peripheral wall portion having a predetermined height along the outer peripheral edge portion of the bottom plate portion. To form a bottomed cylindrical lower-side temporary cutoff structure 3A.

次いで、工事対象の橋脚１に昇降装置18（例えば本工法では平衡保持用天秤とチェーンブロックで構成される昇降装置）を設け、この昇降装置18と構築した下部側仮締切り構造体３Ａとを連結し、昇降装置18によりこの下部側仮締切り構造体３Ａを上昇させ、作業足場４に対して浮上状態にする。尚、本実施例では、この下部側仮締切り構造体３Ａ（上部側仮締切り構造体３Ｂ）を昇降操作する昇降装置18を橋脚１に設けているが、橋脚１上に設置した受替え梁７に設けても良い。 Next, an elevating device 18 (for example, an elevating device composed of a balance balance and a chain block in this method) is provided on the pier 1 to be constructed, and this elevating device 18 is connected to the constructed lower temporary closing structure 3A. Then, the lower temporary closing structure 3 </ b> A is raised by the lifting / lowering device 18 to be in a floating state with respect to the work scaffold 4. In this embodiment, the lifting pier 18 is provided on the pier 1 to lift and lower the lower temporary fastening structure 3A (upper temporary fastening structure 3B). However, the replacement beam 7 installed on the pier 1 is provided. May be provided.

次いで、作業足場４に下部側仮締切り構造体３Ａが通過可能な大きさの開口部５を形成する。 Next, the opening 5 having a size through which the lower temporary cut-off structure 3 </ b> A can pass is formed in the work scaffold 4.

具体的には、開口部５は、吊り上げ状態の下部側仮締切り構造体３Ａの真下に、作業足場４（具体的には、作業足場４を形成している吊り足場２）を撤去して形成する。 Specifically, the opening 5 is formed by removing the working scaffold 4 (specifically, the suspended scaffold 2 forming the working scaffold 4) immediately below the suspended lower-side temporary cutoff structure 3A. To do.

より具体的には、先ず、開口部形成領域（吊り足場撤去領域）の中心部に位置する吊り足場２の足場板16を取り外して折り畳み分解式足場形成枠体10を露出させ、折り畳み分解式足場形成枠体10を足場側に引き寄せて折り畳み状態にし、この折り畳み状態にした折り畳み分解式足場形成枠体10の軸挿通孔15に挿通配設されている連結保持軸13を抜き取り、梁連結部材12から梁部材11を取り外し撤去し、次いで、この撤去した吊り足場２に連設している吊り足場２を同様の手順で撤去する。即ち、本工法では、中心部側（橋脚１に近い側）から外側に向かって順次吊り足場２を撤去して開口部を広げてゆき、下部側仮締切り構造体３Ａが通過可能な開口部５を形成してゆく。 More specifically, first, the scaffolding plate 16 of the suspension scaffold 2 located at the center of the opening formation region (suspending scaffold removal region) is removed to expose the folding and disassembling scaffold forming frame 10 to fold and disassemble the scaffolding. The forming frame body 10 is drawn to the scaffold side to be in a folded state, and the connection holding shaft 13 inserted and disposed in the shaft insertion hole 15 of the folding disassembled scaffold forming frame body 10 in the folded state is extracted, and the beam connecting member 12 Then, the beam member 11 is removed and removed, and then the suspended scaffold 2 connected to the removed suspended scaffold 2 is removed in the same procedure. That is, in this construction method, the suspension scaffold 2 is sequentially removed from the center side (side close to the pier 1) toward the outside to widen the opening, and the opening 5 through which the lower-side temporary fastening structure 3A can pass. Will form.

次いで、昇降装置18を操作して、この作業足場４に形成した開口部５を介して、先に下部側仮締切り構造体３Ａを水域中に設置する。尚、図示しないが、この下部側仮締切り構造体３Ａを降下する際、橋脚１と下部側仮締切り構造体３Ａの夫々にガイドレールを設けて、このガイドレールに沿って降下させることで、下部側仮締切り構造体３Ａを真っ直ぐに安定した状態で水域中に降下させることができる。 Next, the elevating device 18 is operated, and the lower-side temporary cutoff structure 3A is first installed in the water area through the opening 5 formed in the work scaffold 4. Although not shown, when lowering the lower temporary fastening structure 3A, a guide rail is provided on each of the bridge pier 1 and the lower temporary fastening structure 3A, and the lower temporary fastening structure 3A is lowered by moving along the guide rail. The side temporary closing structure 3A can be lowered into the water area in a straight and stable state.

このようにして下部側仮締切り構造体３Ａの設置が完了したら、上部側仮締切り構造体３Ｂを構築するため、作業足場４に形成した開口部５を一度閉口して、下部側仮締切り構造体３Ａを構築する際と同様に、予め作業者が手で持って運搬することができる程度の大きさに形成された上部側用の仮締切り構造体形成部材を、陸地から搬入路８を介して作業足場４まで搬入する。 When the installation of the lower temporary fastening structure 3A is completed in this way, in order to construct the upper temporary fastening structure 3B, the opening 5 formed in the work scaffold 4 is once closed to form the lower temporary fastening structure. Similar to the construction of 3A, an upper-side temporary cut-off structure forming member formed in a size that can be carried and held by a worker in advance is transferred from the land via the carry-in path 8. Carry to work scaffold 4.

次いで、この作業足場４に搬入した上部側用の仮締切り構造体形成部材を、作業足場４上で組み立てて上部側仮締切り構造体３Ｂを構築する。 Next, the upper-side temporary cutoff structure forming member carried into the work scaffold 4 is assembled on the work scaffold 4 to construct the upper-side temporary cutoff structure 3B.

具体的には、下部側仮締切り構造体３Ａの周壁部を立設形成した際と同様の作業を行い、筒状の上部側仮締切り構造体３Ｂを構築する。 Specifically, the same operation as when the peripheral wall portion of the lower-side temporary fastening structure 3A is erected is performed to construct the cylindrical upper-side temporary fastening structure 3B.

以降、下部側仮締切り構造体３Ａを設置する場合と同様、この上部側仮締切り構造体３Ｂを昇降装置18に連結し、この昇降装置18により作業足場４に対して浮上状態にした後、作業足場４に開口部５を形成し、この開口部５を介して上部側仮締切り構造体３Ｂを降下させて、先に水域中に設置した下部側仮締切り構造体３Ａ上に載置し連結して仮締切り構造体３を完成させた後、仮締切り構造体３の上縁部に浮上防止用部材19を配して、この仮締切り構造体３の浮上を防止する。 Thereafter, as in the case of installing the lower-side temporary cutoff structure 3A, the upper-side temporary cutoff structure 3B is connected to the lifting / lowering device 18 and is lifted with respect to the work scaffold 4 by the lifting / lowering device 18. An opening 5 is formed in the scaffold 4, and the upper temporary fastening structure 3 </ b> B is lowered through the opening 5, and is placed on and connected to the lower temporary fastening structure 3 </ b> A previously installed in the water area. Then, after the provisional cutoff structure 3 is completed, a floating prevention member 19 is disposed on the upper edge portion of the provisional cutoff structure 3 to prevent the provisional cutoff structure 3 from rising.

（５）作業用ドライエリア形成工程
本工法における作業用ドライエリア形成工程とは、前述した仮締切り構造体構築・設置工程に次いで行われる本工法の最終工程で、この仮締切り構造体構築・設置工程において水域中に設置した仮締切り構造体３の底部の橋脚貫通孔と橋脚１との間に形成される隙間に対して止水処理を施すと共に、仮締切り構造体３内に入り込んだ水を排水して、この仮締切り構造体３内に作業用のドライエリア（非水域エリア）を形成する工程である。 (5) Work dry area formation process The work dry area formation process in this construction method is the final process of this construction method that is performed after the above-described provisional cut-off structure construction / installation process. In the process, a water stop treatment is applied to a gap formed between the pier through hole at the bottom of the temporary closing structure 3 installed in the water area and the pier 1, and water that has entered the temporary closing structure 3 is removed. This is a step of draining and forming a working dry area (non-water area) in the temporary cutoff structure 3.

具体的には、本工法では、先ず、止水シートやゴム製の止水チューブ等の止水手段（図示しない）を、仮締切り構造体３の底部の橋脚貫通孔と橋脚１との間に形成される隙間に配設し閉塞状態にして、この隙間からの入水を防止する止水処理を行う。 Specifically, in this construction method, first, a water stop means (not shown) such as a water stop sheet or a rubber water stop tube is provided between the pier through hole and the pier 1 at the bottom of the temporary cutoff structure 3. A water stop process is performed to prevent water from entering through the gap formed in the gap.

次いで、この止水処理完了後に、仮締切り構造体３内に入り込んだ水をポンプ等の排水装置20を用いて排水して、この仮締切り構造体３内に作業用ドライエリアを形成する。 Next, after the water stop treatment is completed, the water that has entered the temporary cutoff structure 3 is drained by using a drainage device 20 such as a pump to form a working dry area in the temporary cutoff structure 3.

以上のように行われる本工法の作用効果について以下に説明する。 The operational effects of the present construction method performed as described above will be described below.

本工法は、搬入路形成工程において、陸地と作業足場４とを結ぶ搬入路８を形成するから、作業者がこの搬入路８を利用して陸地から作業足場４に行くことができるため、従来使用していた台船が不要になり、この台船を現場まで輸送する際に発生する多大な労力と費用を削減することができる。 Since this construction method forms a carry-in route 8 connecting the land and the work scaffold 4 in the carry-in route forming step, the worker can use this carry-in route 8 to go to the work scaffold 4 from the land. The used trolley becomes unnecessary, and a great amount of labor and cost generated when the craft is transported to the site can be reduced.

また、本工法は、搬入路８及び作業足場４を形成する足場形成部２（吊り足場２）に、折り畳み分解式足場形成枠体10を備える足場形成部２（吊り足場２）を用いるから、搬入路８及び作業足場４の形成、撤去する作業、並びに作業足場４に仮締切り構造体３を降下させる際の開口部５を形成する作業が容易になり、しかも、これらの作業を梁等の危険な足場ではなく、きちんとした形成された足場上で行うことができるので安全に作業を行うことができる。 Moreover, since this construction method uses the scaffold formation part 2 (suspending scaffold 2) provided with the folding decomposition | disassembly type | mold scaffolding frame 10 in the scaffold formation part 2 (suspending scaffold 2) which forms the carrying-in path 8 and the work scaffold 4, The work for forming and removing the carry-in path 8 and the work scaffold 4 and the work for forming the opening 5 when the temporary cutoff structure 3 is lowered on the work scaffold 4 are facilitated. The work can be performed safely because it can be performed not on a dangerous scaffold but on a properly formed scaffold.

また、本工法では、仮締切り構造体３を構築する作業足場４を、橋桁６ではなく、橋脚１に設置した受替え梁７に吊設するから、作業足場４上で重量のある仮締切り構造体３を構築しても、橋桁６に負荷がかからないので、加重により橋梁や橋桁６に悪影響を及ぼすおそれがなく、安心して作業足場４上で仮締切り構造体３を構築することができる。 Further, in this construction method, the work scaffold 4 for constructing the temporary closing structure 3 is hung not on the bridge girder 6 but on the replacement beam 7 installed on the pier 1, so that the heavy temporary closing structure on the work scaffold 4 is provided. Even if the body 3 is constructed, no load is applied to the bridge girder 6, so there is no possibility that the bridge or the bridge girder 6 will be adversely affected by weighting, and the temporary closing structure 3 can be constructed on the work scaffold 4 with confidence.

尚、本発明は、本実施例に限られるものではなく、各構成要件の具体的構成は適宜設計し得るものである。 Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

１橋脚
２足場形成部
４作業足場
６橋桁
８搬入路
９搬入部
10 折り畳み分解式足場形成枠体
11 梁部材
12 梁連結部材
13 連結保持軸
14 軸挿通孔
15 軸挿通孔
16 足場板 DESCRIPTION OF SYMBOLS 1 Pier 2 Scaffolding part 4 Working scaffold 6 Bridge girder 8 Carry-in path 9 Carry-in part
10 Folding disassembly type scaffolding frame
11 Beam members
12 Beam connecting member
13 Connection holding shaft
14 Shaft insertion hole
15 Shaft insertion hole
16 Scaffolding board

Claims

水域上に架設される橋梁の橋脚の周囲に作業足場を構築する足場構築工法において、前記橋梁の一側の陸地若しくは前記陸地に設けられる搬入部から前記橋脚に向かう搬入路を前記橋梁に吊設形成し、この搬入路に連設させて前記作業足場を前記橋梁に吊設形成し、この作業足場は、複数の折り畳み分解式足場形成枠体を連設して形成する構成とされ、この折り畳み分解式足場形成枠体は、複数の梁部材、この梁部材の端部が水平回動自在且つ着脱自在に連結される梁連結部材及び前記梁部材の回動軸となると共にこの梁部材と前記梁連結部材との連結を保持する連結保持軸を備え、前記梁部材の端部に設けられている軸挿通孔と、前記梁連結部材に設けられている軸挿通孔とを連通状態にして軸挿通連通孔を形成し、この軸挿通連通孔に前記連結保持軸を挿入配設することで組み立て形成することができ、この組み立て形成された状態で前記軸挿通連通孔に挿通配設されている前記連結保持軸を抜き取ることで前記梁連結部材から前記梁部材を分離して撤去することができるように構成されていることを特徴とする足場構築工法。 In the scaffold construction method for constructing a work scaffold around the pier of a bridge constructed over a water area, a loading path from the land on one side of the bridge or a loading section provided on the land to the pier is suspended from the bridge The working scaffold is suspended from the bridge by being connected to the carry-in path, and the working scaffold is formed by connecting a plurality of folding and disassembling scaffold forming frames. The disassembling scaffold forming frame includes a plurality of beam members, a beam connecting member in which ends of the beam members are horizontally and freely detachably connected, and a rotation axis of the beam member. A connection holding shaft for holding the connection with the beam connecting member, and the shaft insertion hole provided at the end of the beam member and the shaft insertion hole provided in the beam connecting member are in communication with each other; An insertion communication hole is formed, and the shaft insertion communication hole is The connecting and holding shaft can be assembled and inserted, and in this assembled and formed state, the connecting and holding shaft inserted and arranged in the shaft insertion and communication hole is pulled out from the beam connecting member. A scaffold construction method characterized by being configured to be able to separate and remove a beam member.

前記搬入路は、前記橋梁の橋桁に吊設することを特徴とする請求項１記載の足場構築工法。 The scaffold construction method according to claim 1, wherein the carry-in route is suspended from a bridge girder of the bridge.

前記搬入路は、複数の前記折り畳み分解式足場形成枠体を連設して形成することを特徴とする請求項１，２のいずれか１項に記載の足場構築工法。 The scaffolding construction method according to any one of claims 1 and 2, wherein the carry-in path is formed by connecting a plurality of the folding and disassembling scaffold forming frames.

前記搬入路の端部に、前記梁部材と前記梁連結部材と前記連結保持軸により折り畳み状態にした折り畳み分解式足場形成枠体を組み付け形成し、この折り畳み状態で組み付け形成した折り畳み分解式足場形成枠体を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体に足場板を敷設して足場形成部を形成すると共に、前記折り畳み分解式足場形成枠体に更に前記梁部材と前記梁連結部材と前記連結保持軸により折り畳み状態にした折り畳み分解式足場形成枠体を組み付け形成し、この折り畳み状態で組み付け形成した折り畳み分解式足場形成枠体を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体に足場板を敷設して足場形成部を形成して、前記足場形成部で形成される足場形成域を順次拡張形成して前記作業足場を形成することを特徴とする請求項１〜３のいずれか１項に記載の足場構築工法。 Folding and disassembling scaffold forming frame that is folded by the beam member, the beam connecting member and the connection holding shaft is assembled and formed at the end of the carry-in path, and the folding and disassembling scaffold is formed by assembling and forming in this folded state. The frame body is horizontally rotated to be in an unfolded state, and a scaffold plate is laid on the folding and disassembling scaffold forming frame body in the unfolding state to form a scaffold forming portion, and the folding and disassembling scaffold forming frame body further includes A folding and disassembling scaffold forming frame that is folded by the beam member, the beam connecting member, and the connection holding shaft is assembled and formed, and the folding and disassembling scaffold forming frame that is assembled and formed in the folded state is horizontally rotated. In the unfolded state, a scaffold plate is laid on the folding and disassembling scaffold forming frame body in the unfolded state to form the scaffold forming portion, and the scaffold forming area formed by the scaffold forming portion is ordered. Scaffolding Construction method according to any one of claims 1 to 3, characterized in that to form the working scaffold extended form.

前記折り畳み分解式足場形成枠体に足場板を敷設して形成した足場形成部に、更に前記梁部材と前記梁連結部材と前記連結保持軸により折り畳み状態にした折り畳み分解式足場形成枠体を組み付け形成し、この折り畳み状態で組み付け形成した折り畳み分解式足場形成枠体を水平回動操作して展開状態にし、この展開状態の折り畳み分解式足場形成枠体に足場板を敷設して足場形成部を形成して、前記足場形成部で形成される足場形成域を順次拡張形成して前記搬入路を形成することを特徴とする請求項１〜４のいずれか１項に記載の足場構築工法。 Assembling the folding and disassembling scaffold forming frame that is folded by the beam member, the beam connecting member, and the connection holding shaft to the scaffold forming portion formed by laying a scaffolding plate on the folding and disassembling scaffold forming frame. The folding and disassembling scaffold forming frame body formed and assembled in this folded state is horizontally rotated to the unfolded state, and a scaffold plate is laid on the folding and disassembling scaffold forming frame body in the unfolded state to The scaffold construction method according to any one of claims 1 to 4, wherein the scaffold formation region is formed by sequentially extending and forming the scaffold formation region formed by the scaffold formation portion.