JP6741279B1 - Installation method of temporary shutoff structure used for bridge pier repair and reinforcement work - Google Patents

Installation method of temporary shutoff structure used for bridge pier repair and reinforcement work Download PDF

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JP6741279B1
JP6741279B1 JP2019040239A JP2019040239A JP6741279B1 JP 6741279 B1 JP6741279 B1 JP 6741279B1 JP 2019040239 A JP2019040239 A JP 2019040239A JP 2019040239 A JP2019040239 A JP 2019040239A JP 6741279 B1 JP6741279 B1 JP 6741279B1
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scaffold
temporary
work
cutoff structure
temporary cutoff
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JP2020143489A (en
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佐々木 健一
健一 佐々木
久人 小林
久人 小林
秀文 春日
秀文 春日
暁伸 渡邊
暁伸 渡邊
公一 吉村
公一 吉村
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Nisso Industries Co Ltd
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Abstract

【課題】水域上に効率良く仮締切り構造体を構築することができる橋脚補修・補強工事に用いる仮締切り構造体の設置工法を提供することを目的とする。【解決手段】下部側仮締切り構造体2aを水域中に設置した後、作業用足場4をこの水域中に設置した下部側仮締切り構造体2aの上部位置まで降下させ、この降下させた作業用足場4を足場にして下部側仮締切り構造体2a上に仮締切り構造体2の上部側となる上部側仮締切り構造体2bを直接構築する。【選択図】図9PROBLEM TO BE SOLVED: To provide a method of installing a temporary shutoff structure used for bridge pier repair/reinforcement work capable of efficiently constructing a temporary shutoff structure on a water area. SOLUTION: After the lower temporary cutoff structure 2a is installed in the water area, the work scaffold 4 is lowered to the upper position of the lower temporary cutoff structure 2a installed in this water area, and the lowered work Using the scaffold 4 as a scaffold, the upper temporary cutoff structure 2b, which is the upper side of the temporary cutoff structure 2, is directly constructed on the lower temporary cutoff structure 2a. [Selection diagram] Fig. 9

Description

本発明は、河川、海、湖等の水域上に架設される橋梁の橋脚の補修・補強工事に用いる仮締切り構造体の設置工法に関するものである。 TECHNICAL FIELD The present invention relates to a method for installing a temporary cutoff structure used for repair/reinforcement work of bridge piers of bridges constructed over water areas such as rivers, seas, and lakes.

河川、海、湖等の水域上に架設される橋梁の橋脚を補修、補強するための工事を行う際に、この橋脚の周囲に作業用のドライエリアを形成する場合があり、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。 When performing work to repair or reinforce the piers of bridges that are erected on rivers, seas, lakes, etc., dry areas for work may be formed around these piers. A temporary cutoff method is known as a method of forming an area.

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り、本出願人は自己の先願に係る特願2018−30645号において、この先願発明の足場構築工法を用いて橋脚の補修・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を提案している。 In this temporary cut-off method, a temporary cut-off structure made of steel plate is installed around the pier to partition the pier and the water area, and the water inside the temporary cut-off structure is drained to form a dry area around the pier. Therefore, in the Japanese Patent Application No. 2018-30645, which is related to the prior application of the present applicant, the present applicant uses the scaffolding construction method of the invention of this prior application to dry a work area using a temporary cut-off structure in repair/reinforcement work of piers. Is proposed.

具体的には、この工法は、先ず、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に連設する吊り足場を橋梁の橋桁に沿って工事対象の橋脚まで延設し、この橋桁に吊設された吊り足場により搬入路とこの搬入路に連設する仮締切り構造体を構築するための作業足場を形成し、次いで、作業足場吊り替え工程にて橋脚に受替え梁を設け、作業足場を形成する吊り足場を橋桁からこの受替え梁に吊り替え吊設し、次いで、仮締切り構造体構築・設置工程にて、この受替え梁に吊り替え吊設した吊り足場で形成される作業足場上で仮締切り構造体を構築し、その後、作業足場に開口部を形成し、この開口部を介して仮締切り構造体を降下させて水域中に配置し、最終工程である作業用ドライエリア形成工程にて仮締切り構造体の底部の橋脚貫通孔と橋脚との間を止水し、仮締切り構造体内に入り込んだ水を排水して、この仮締切り構造体内に作業用のドライエリアを形成するものである。 Specifically, this construction method first constructs a suspension scaffold that is connected to a land on one side of the bridge or a carry-in section provided on the land along the bridge girder of the bridge in the process of forming the access route and the process of forming the work scaffold. A work scaffold that extends to the target pier and is used to construct a carry-in path and a temporary cut-off structure that is connected to this carry-in path is formed by the hanging scaffolds suspended on this bridge girder, and then the work scaffold suspension process At the bridge pier, a replacement beam is installed, and the suspension scaffold that forms the work scaffold is hung from the bridge girder and hung from the bridge beam, and then suspended on this bridge beam in the temporary cutoff structure construction/installation process. A temporary closing structure is constructed on the working scaffold formed by the suspended hanging scaffolding, and then an opening is formed on the working scaffold, and the temporary closing structure is lowered through this opening to enter the water area. In the final process, the work dry area formation process, the water is stopped between the pier through hole at the bottom of the temporary cutoff structure and the pier, and the water that has entered the temporary cutoff structure is drained. A dry area for working is formed in the dead-off structure.

ところで、上述した先願発明に記載される仮締切り構造体の設置工法(以下、従来工法と称す。)は、高さが高い仮締切り構造体を構築、設置する場合は、仮締切り構造体を上下に分割して構築・設置しており、具体的には、先ず、作業足場上で仮締切り構造体の下部側を構築し、この下部側の仮締切り構造体を構築した後、この下部側の仮締切り構造体を昇降装置に連結し、この昇降装置により作業足場から浮上させた状態にした後、作業足場に開口部を形成し、にこの開口部よりこの下部側の仮締切り構造体を作業足場から降下させて水域中に設置し、その後、作業用足場に形成した開口部を閉口して作業足場をもとの状態に戻し、この作業足場上で仮締切り構造体の上部側を構築し、その後、下部側の仮締切り構造体と同様にこの上部側の仮締切り構造体も昇降装置に連結し、この昇降装置により作業足場から浮上させた状態にした後、作業足場に再び開口部を形成し、この開口部を介して作業足場から上部側の仮締切り構造体を降下させて、先に水域中に設置した下部側の仮締切り構造体上に載置し連結して仮締切り構造体を構築していた。 By the way, when the temporary closing structure installation method (hereinafter referred to as a conventional method) described in the above-mentioned prior invention is constructed and installed with a high temporary closing structure, the temporary closing structure is It is constructed and installed by dividing it into upper and lower parts. Specifically, first, the lower side of the temporary cutoff structure is built on the work scaffold, and after building the temporary cutoff structure of this lower side, this lower side The temporary cut-off structure is connected to the lifting device, and after being lifted from the work scaffold by this lifting device, an opening is formed in the work scaffold, and the temporary cut-off structure on the lower side of the opening is formed. Drop from the work scaffold and install in the water area, then close the opening formed in the work scaffold to return the work scaffold to the original state, and build the upper side of the temporary cutoff structure on this work scaffold Then, similarly to the lower temporary cutoff structure, this upper temporary cutoff structure is also connected to the lifting device, and after being lifted from the work scaffold by this lifting device, the opening part is again opened on the work scaffold. The temporary cut-off structure is formed by lowering the upper temporary cut-off structure from the work scaffold through this opening, and placing it on the lower temporary cut-off structure that was previously installed in the water area. Was building the body.

本発明は、この従来工法に係る改良発明であり、仮締切り構造体を下部側と上部側に分けて構築する場合に、仮締切り構造体の下部側となる下部側仮締切り構造体を水域中に設置する際に作業用足場に形成した開口部を閉口したり再び開口したりする作業用足場開閉作業の工数を削減すると共に、仮締切り構造体を昇降装置に連結して作業用足場から浮上させる仮締切り構造体昇降作業の工数を削減して、効率良く水域上に仮締切り構造体を構築することができる橋脚補修・補強工事に用いる仮締切り構造体の設置工法を提供することを目的とする。 The present invention is an improved invention related to this conventional construction method, and when the temporary cutoff structure is constructed by dividing it into a lower side and an upper side, the lower side temporary cutoff structure, which is the lower side of the temporary cutoff structure, is placed in the water area. It reduces the number of man-hours required to open and close the work scaffold that closes and reopens the opening formed in the work scaffold when installing the work scaffold, and also lifts the work from the work scaffold by connecting the temporary cutoff structure to the lifting device. The purpose of the present invention is to provide a method for installing a temporary cutoff structure to be used for bridge pier repair/reinforcement work that reduces the man-hours required for raising and lowering the temporary cutoff structure to efficiently construct a temporary cutoff structure on the water. To do.

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1の補修・補強工事を行う対象の橋脚1aの周囲に作業用のドライエリアを形成するための仮締切り構造体2を設置する橋脚補修・補強工事に用いる仮締切り構造体の設置工法であって、前記橋梁1に沿って作業者が通行する通路用足場3を形成する通路用足場形成工程と、前記通路用足場3と連設され前記仮締切り構造体2を構築する際の足場となる作業用足場4を前記橋脚1aの周囲に形成する作業用足場形成工程と、前記作業用足場4上で前記仮締切り構造体2の下部側となる下部側仮締切り構造体2aを構築する下部側仮締切り構造体構築工程と、前記下部側仮締切り構造体2aを水域中に設置する下部側仮締切り構造体設置工程と、前記作業用足場4を水域中に設置された前記下部側仮締切り構造体2aの上部位置まで降下させる作業用足場降下工程と、水域中に設置された前記下部側仮締切り構造体2aの上部位置まで降下させた前記作業用足場4を足場にして前記下部側仮締切り構造体2a上に前記仮締切り構造体2の上部側となる上部側仮締切り構造体2bを直接構築する上部側仮締切り構造体構築工程とを有することを特徴とする橋脚補修・補強工事に用いる仮締切り構造体の設置工法に係るものである。 Temporary cut-off structure used for bridge pier repair/reinforcement work to install temporary cut-off structure 2 for forming a dry area for work around the bridge pier 1a to be repaired/reinforced for the bridge 1 erected above the water area A method of installing a body, which comprises a step of forming a scaffold for passages for forming a passage scaffold 3 for passage of an operator along the bridge 1, and a construction of the temporary cut-off structure 2 connected to the scaffolds for passage 3 A work scaffold forming step of forming a work scaffold 4 to be a scaffold for the work on the periphery of the pier 1a, and a lower temporary cutoff structure which is a lower side of the temporary cutoff structure 2 on the work scaffold 4 2a, a lower temporary cutoff structure construction step, a lower temporary cutoff structure installation step for setting the lower temporary cutoff structure 2a in the water area, and the work scaffold 4 set in the water area. The work scaffold descending step of descending to the upper position of the lower temporary cutoff structure 2a, and the work scaffold 4 lowered to the upper position of the lower temporary cutoff structure 2a installed in the water area are used as scaffolds. And an upper temporary cutoff structure construction step of directly constructing an upper temporary cutoff structure 2b, which is an upper side of the temporary cutoff structure 2, on the lower temporary cutoff structure 2a. This relates to the method of installing the temporary cutoff structure used for repair and reinforcement work.

また、前記橋梁1の前記橋脚1aに受替え梁5を設け、この受替え梁5に前記作業用足場4を吊り替える作業用足場吊り替え工程を有することを特徴とする請求項1記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法に係るものである。 The bridge pier according to claim 1, further comprising: a replacement beam 5 provided on the bridge pier 1a of the bridge 1, and a work scaffold suspension process of suspending the work scaffold 4 on the interchange beam 5. This relates to the method of installing the temporary cutoff structure used for repair and reinforcement work.

また、前記作業用足場4上で前記下部側仮締切り構造体2aを構築する前に若しくは構築途中で、前記作業用足場4を降下させて前記下部側仮締切り構造体2aの構築空間を確保することを特徴とする請求項1,2のいずれか1項に記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法に係るものである。 Further, before or during the construction of the lower temporary shutoff structure 2a on the work scaffold 4, the working scaffold 4 is lowered to secure a construction space for the lower temporary shutoff structure 2a. The present invention relates to a method of installing a temporary shutoff structure used for repair/reinforcement of a bridge pier according to any one of claims 1 and 2.

また、前記作業用足場形成工程において昇降機能付き吊設具6を介して前記作業用足場4を前記橋梁1に昇降自在に吊設することを特徴とする請求項1〜3のいずれか1項に記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法に係るものである。 The work scaffold 4 is hung up and down on the bridge 1 via a lifting tool 6 with a lifting function in the work scaffold formation step. It relates to the method of installing the temporary shut-off structure used for the bridge pier repair/reinforcement work described in.

また、複数の梁部材7aと、この梁部材7a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7bと、前記梁部材7aの回動軸となると共にこの梁部材7aと前記梁連結部材7bとの連結を保持する連結保持軸7cとを備え、前記梁部材7aの端部に設けられている軸挿通孔7dと前記梁連結部材7bに設けられている軸挿通孔7e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7c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7cを抜き取ることで前記梁連結部材7bから前記梁部材7aを分離して撤去することができる折り畳み分解自在な吊り足場体7を用いて前記作業用足場4を形成することを特徴とする請求項1〜4のいずれか1項に記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法に係るものである。 Further, a plurality of beam members 7a, a beam connecting member 7b to which end portions of the beam member 7a are horizontally rotatably and detachably attached, and a beam member 7a which serves as a rotating shaft of the beam member 7a. A connection holding shaft 7c for holding connection with the beam connection member 7b is provided, and a shaft insertion hole 7d provided at an end of the beam member 7a and a shaft insertion hole 7e provided in the beam connection member 7b. Can be assembled to form a shaft insertion communication hole, and the connection holding shaft 7c can be inserted and disposed in the shaft insertion communication hole. In this assembled state, the shaft insertion communication hole can be formed. The working scaffold using a foldable and dismountable suspension scaffolding body 7 capable of separating and removing the beam member 7a from the beam connecting member 7b by pulling out the connection holding shaft 7c which is inserted through 4. The present invention relates to a method of installing a temporary cutoff structure used for repair/reinforcement of a bridge pier according to any one of claims 1 to 4, characterized in that 4 is formed.

また、前記吊り足場体7を用いて前記通路用足場3を形成することを特徴とする請求項5記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法に係るものである。 Further, the suspension scaffolding 7 is used to form the passage scaffolding 3, and the method for installing a temporary cutoff structure used for pier repair/reinforcement work according to claim 5 is characterized.

本発明は上述のようにするから、下部側仮締切り構造体を水域中に設置する際に作業用足場に形成した開口部を閉口したり再び開口したりする作業用足場開閉作業の工数を削減することができると共に、上部側仮締切り構造体を昇降装置に連結して作業用足場から浮上させる仮締切り構造体昇降作業を削減することができ、効率良く下部側仮締切り構造体上に上部側仮締切り構造体を構築して水域上に仮締切り構造体を構築することができる画期的な橋脚補修・補強工事に用いる仮締切り構造体の設置工法となる。 INDUSTRIAL APPLICABILITY Since the present invention is as described above, it is possible to reduce the man-hours required for opening and closing the work scaffold for closing and reopening the opening formed on the work scaffold when the lower temporary cutoff structure is installed in the water area. In addition, it is possible to reduce the lifting work of the temporary cutoff structure that connects the upper temporary cutoff structure to the lifting device and levitates it from the work scaffolding, and efficiently put the upper cutoff structure on the lower temporary cutoff structure. This will be an epoch-making installation method for temporary pier repair/reinforcement work that can construct a temporary cut-off structure and construct it on the water.

本実施例における施工前の橋梁を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the bridge before construction in a present Example. 本実施例における施工手順(通路用足場形成工程及び作業用足場形成工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (scaffold formation process for passages, and scaffold formation process for work) in a present Example. 本実施例における施工手順(作業用足場吊り替え工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (work scaffold suspending process) in a present Example. 本実施例における施工手順(作業用足場吊り替え工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (work scaffold suspending process) in a present Example. 本実施例における施工手順(作業用足場吊り替え工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (work scaffold suspending process) in a present Example. 本実施例における施工手順(下部側仮締切り構造体構築工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (lower side temporary shutoff structure construction process) in a present Example. 本実施例における施工手順(下部側仮締切り構造体設置工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (lower side temporary shutoff structure installation process) in a present Example. 本実施例における施工手順(下部側仮締切り構造体設置工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (lower side temporary shutoff structure installation process) in a present Example. 本実施例における施工手順(作業用足場降下工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (scaffold descending process for work) in a present Example. 本実施例における施工手順(上部側仮締切り構造体構築工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (upper side temporary cutoff structure construction process) in a present Example. 本実施例における施工手順(上部側仮締切り構造体構築工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (upper side temporary cutoff structure construction process) in a present Example. 本実施例における施工手順(ドライエリア形成工程)を示す説明図正断面図(a)及び説明側面図(b)である。It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the construction procedure (dry area forming process) in a present Example. 本実施例に用いられる吊り足場体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 used for a present Example. 本実施例の作業用足場形成工程において形成した作業用足場を示す説明平面図である。It is an explanatory plan view showing a work scaffold formed in the work scaffold formation step of the present embodiment. 本実施例の通路用足場形成工程及び作業用足場形成工程における通路用足場及び作業用足場を形成する際の作業手順を示す説明図であり、(a)は枠体を折り畳み状態で組付けた状態を示す図であり、(b)は折り畳み状態で組付けた枠体を展開操作した状態を示す図であり、(c)は展開した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 a passage scaffold and a work scaffold in the passage scaffold formation process of this Example, and a work scaffold formation process, (a) assembled the frame body in the folded state. It is a figure which shows a state, (b) is a figure which shows the state which expanded the frame body attached in the folded state, and (c) is a figure which shows the state which laid the scaffolding board on the expanded frame body. .. 本実施例における受替え梁を示す側面図である。It is a side view which shows the interchange beam in a present Example. 本実施例の下部側仮締切り構造体設置工程における作業用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 plan view showing a state where an opening is formed in a work scaffold in a lower temporary cutoff structure installation step of the present embodiment.

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。 A preferred embodiment of the present invention will be briefly described with reference to the drawings showing the operation of the present invention.

通路用足場形成工程は、例えば陸地から橋梁1の補修・補強工事の対象となる橋脚1aの近傍までの間、橋梁1に沿って作業者が陸地と作業用足場4とを行き来するための通路となる通路用足場3を形成する工程である。 The step for forming a passage scaffold is, for example, a passage for a worker to go back and forth between the land and the work scaffold 4 along the bridge 1 from the land to the vicinity of the bridge pier 1a to be repaired/reinforced for the bridge 1. This is a step of forming the scaffold 3 for the passage.

また、作業用足場形成工程は、通路用足場形成工程において形成した通路用足場3と連設するようにして補修・補強工事の対象となる橋脚1aの周囲に仮締切り構造体2を構築する際の足場となる作業用足場4を形成する工程である。 Further, the work scaffold formation step is performed when the temporary cut-off structure 2 is constructed around the pier 1a to be repaired/reinforced so that it is connected to the passage scaffold 3 formed in the passage scaffold formation step. This is a step of forming the work scaffold 4 that will be the scaffold.

また、下部側仮締切り構造体構築工程は、分割構築する仮締切り構造体2の下部側となる下部側仮締切り構造体2aを作業用足場4上で構築する工程である。 In addition, the lower temporary cutoff structure building step is a step of building the lower temporary cutoff structure 2a on the work scaffold 4 which is the lower side of the temporary cutoff structure 2 to be divided and built.

また、下部側仮締切り構造体設置工程は、下部側仮締切り構造体構築工程において構築した下部側仮締切り構造体2aを水域中に設置する工程であり、具体的には、従来工法と同様、作業用足場4上に構築した下部側仮締切り構造体2aを昇降装置8により作業用足場4から浮上させ、作業用足場4に下部側仮締切り構造体2aが通過可能な開口部9を形成した後、この開口部9を介して昇降装置8により降下させてこの下部側仮締切り構造体2aを水域中に設置するものである。 Further, the lower temporary cutoff structure installation step is a step of installing the lower temporary cutoff structure 2a constructed in the lower temporary cutoff structure construction step in the water area, and specifically, like the conventional method, The lower temporary cutoff structure 2a constructed on the work scaffold 4 was lifted from the work scaffold 4 by the lifting device 8, and the opening 9 through which the lower temporary cutoff structure 2a can pass is formed in the work scaffold 4. After that, it is lowered by the lifting device 8 through the opening 9 and the lower temporary cutoff structure 2a is installed in the body of water.

また、作業用足場降下工程は、下部側仮締切り構造体設置工程において水域中に設置した下部側仮締切り構造体2a上に仮締切り構造体2の上部側となる上部側仮締切り構造体2bを直接積み上げ形成(構築)するため、作業用足場4を下部側仮締切り構造体2aの上部位置まで降下させる工程であり、具体的には、降下させる作業用足場4は、下部側仮締切り構造体2aを降下させるために形成した開口部9を開口させたままの状態で降下させる。即ち、この作業用足場降下工程においては、水域中に設置した下部側仮締切り構造体2aの上部がこの開口部9とほぼ面一状態若しくは開口部9からやや突出状態となる高さ位置まで作業用足場4を降下させる工程である。 In addition, in the scaffold descending step for work, the upper temporary cutoff structure 2b to be the upper side of the temporary cutoff structure 2 is placed on the lower temporary cutoff structure 2a installed in the water in the lower temporary cutoff structure installation step. This is a step of lowering the work scaffold 4 to the upper position of the lower side temporary shut-off structure 2a for directly stacking (constructing), and specifically, the work scaffold 4 to be lowered is the lower side temporary shut-off structure. The opening 9 formed for lowering 2a is lowered while being left open. That is, in this scaffold descending step for work, work is performed up to a height position where the upper part of the lower temporary cutoff structure 2a installed in the water area is substantially flush with the opening 9 or slightly protruding from the opening 9. This is a step of lowering the scaffold 4.

また、上部側仮締切り構造体構築工程は、作業用足場降下工程において所定位置(下部側仮締切り構造体2aの上部が作業用足場4に形成された開口部9とほぼ面一状態若しくは開口部9からやや突出状態となる位置)まで降下させた作業用足場4を足場にして、この作業用足場4に形成された開口部9から露出する下部側仮締切り構造体2aの上端部上に直接、上部側仮締切り構造体2bを所定高さまで積み上げ形成して仮締切り構造体2を完成させる工程である。 In addition, the upper temporary cutoff structure construction step is performed at a predetermined position (the upper portion of the lower temporary cutoff structure 2a is substantially flush with the opening 9 formed in the work scaffold 4 or an opening in the work scaffold descending step). 9 to a position where the work scaffold 4 is lowered to a position in which the work scaffold 4 is slightly protruded from the work scaffold 4 and is directly exposed on the upper end of the lower temporary cutoff structure 2a exposed from the opening 9 formed in the work scaffold 4. Is a step of stacking and forming the upper temporary cutoff structure 2b to a predetermined height to complete the temporary cutoff structure 2.

このように、本発明は、下部側仮締切り構造体2a上に上部側仮締切り構造体2bを構築する際に、作業用足場4を下部側仮締切り構造体2aの上部位置まで降下させ、この下部側仮締切り構造体2aの上部位置まで降下させた作業用足場4を作業足場にして直接下部側仮締切り構造体2a上に上部側仮締切り構造体2bを積み上げ形成してゆくから、従来工法で行われていた下部側仮締切り構造体を水域中に設置した後、上部側仮締切り構造体を構築するために作業用足場に形成した開口部を一旦閉口しその後また開口したりする作業用足場開閉作業や、下部側仮締切り構造体同様、上部側仮締切り構造体を昇降装置に連結してこの下部側仮締切り構造体を昇降操作する上部側仮締切り構造体昇降作業が不要となり、これにより、従来工法に比べて効率良く下部側仮締切り構造体2a上に上部側仮締切り構造体2bを構築して水域中に仮締切り構造体2を構築することができる画期的な橋脚補修・補強工事に用いる仮締切り構造体の設置工法となる。 As described above, according to the present invention, when the upper temporary cutoff structure 2b is constructed on the lower temporary cutoff structure 2a, the work scaffold 4 is lowered to the upper position of the lower temporary cutoff structure 2a. Since the work scaffold 4 lowered to the upper position of the lower temporary cutoff structure 2a is used as a work scaffold, the upper temporary cutoff structure 2b is directly stacked and formed on the lower temporary cutoff structure 2a. For the work to install the lower temporary cut-off structure, which was performed in the above, in the water area, then temporarily close the opening formed on the work scaffold to build the upper temporary cut-off structure and then open it again. Scaffold opening and closing work and upper and lower temporary cutoff structure elevating work for connecting the upper temporary cutoff structure to the lifting device and lifting and lowering this lower temporary cutoff structure, like the lower temporary cutoff structure, become unnecessary. As a result, a breakthrough pier repair that can efficiently construct the upper temporary shutoff structure 2b on the lower temporary shutoff structure 2a and construct the temporary shutoff structure 2 in the water area compared to the conventional method. This will be the construction method for the temporary cut-off structure used for reinforcement work.

なお、本発明において、下部側仮締切り構造体設置工程と作業用足場降下工程の順序については、上述したように下部側仮締切り構造体設置工程を行ってから作業用足場降下工程を行っても良いし、また、逆に作業用足場降下工程を行ってから下部側仮締切り構造体設置工程を行っても良い。即ち、先に作業用足場4を所定位置まで降下させ、その後、作業用足場4に開口部9を形成して下部側仮締切り構造体2aを水域中に降下設置しても良いこととする。 In the present invention, regarding the order of the lower temporary cutoff structure installation step and the work scaffold lowering step, as described above, even if the lower temporary cutoff structure installation step is performed, the working scaffold lowering step is performed. Alternatively, on the contrary, the lower temporary cutoff structure installation step may be performed after the work scaffold lowering step is performed. That is, the working scaffold 4 may be first lowered to a predetermined position, and thereafter the opening 9 may be formed in the working scaffold 4 to lower and install the lower temporary cutoff structure 2a in the water area.

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、河川、海、湖等の水域上に架設される橋梁1の補修・補強工事の対象となる橋脚1aの周囲に作業用のドライエリアを形成する仮締切り工法に、本発明の橋脚補修・補強工事に用いる仮締切り構造体の設置工法を適用した場合である。 The present embodiment is applied to a temporary cutoff method for forming a dry area for work around a bridge pier 1a which is a target of repair/reinforcement work of a bridge 1 erected on a water body such as a river, sea, lake, etc. This is the case when the installation method of temporary cutoff structure used for bridge pier repair and reinforcement work is applied.

具体的には、本実施例における仮締切り工法は、河川、海、湖等の水域上に架設される橋梁1の工事対象の橋脚1aの周囲に仮締切り構造体2を設置して橋脚1aと水域を仕切り、仮締切り構造体2内の水を排水して橋脚1aの周囲にドライエリアを形成するものであり、より具体的には、(1)通路用足場形成工程、(2)作業用足場形成工程、(3)作業用足場吊り替え工程、(4)下部側仮締切り構造体構築工程、(5)下部側仮締切り構造体設置工程、(6)作業用足場降下工程、(7)上部側仮締切り構造体構築工程及び(8)ドライエリア形成工程を有するものである。 Specifically, the temporary cut-off construction method in the present embodiment is such that the temporary cut-off structure 2 is installed around the bridge pier 1a to be constructed of the bridge 1 which is erected on the body of water such as a river, the sea, or a lake and the bridge pier 1a is formed. It divides the water area and drains the water in the temporary cutoff structure 2 to form a dry area around the pier 1a. More specifically, (1) a scaffold formation process for passages, (2) work Scaffold formation process, (3) work scaffold suspension process, (4) lower side temporary cutoff structure construction process, (5) lower side temporary cutoff structure installation process, (6) work scaffold descending process, (7) The upper side temporary cutoff structure construction step and (8) dry area formation step are included.

以下、本実施例の仮締切り工法の上記(1)〜(8)の各工程について、施工手順に沿って詳述する。 Hereinafter, each of the steps (1) to (8) of the temporary cutoff method of the present embodiment will be described in detail along with the construction procedure.

(1)通路用足場形成工程
本実施例の通路用足場形成工程は、図2に示すように、橋梁1の一側の陸地に設置した櫓状、階段状若しくはスロープ状の足場からなる出入部10から橋梁1の補修・補強工事の対象となる橋脚1aの近傍(手前)までの間、橋梁1に沿って作業者が陸地と作業用足場4とを行き来するための通路となる通路用足場3を形成する工程である。
(1) Passage scaffold formation process The passage scaffold formation process of the present embodiment, as shown in FIG. 2, is an entrance/exit consisting of a tower-like, step-like or slope-like scaffold installed on the land on one side of the bridge 1. From 10 to the vicinity (front) of the bridge pier 1a that is the target of repair/reinforcement work for the bridge 1, a walkway scaffold that is a passageway for workers to go back and forth between the land and the work scaffold 4 along the bridge 1 3 is a step of forming 3.

具体的には、本実施例の通路用足場形成工程は、複数の吊り足場体7を用い、この吊り足場体7を橋梁1の橋桁1bに吊設すると共に連設して、この橋桁1bに沿って通路用足場3を延設形成している。 Specifically, in the step of forming scaffolding for passage of the present embodiment, a plurality of suspension scaffolds 7 are used, and the suspension scaffolds 7 are suspended from and continuously connected to the bridge girder 1b of the bridge 1 to form the bridge girder 1b. A walkway scaffold 3 is formed along the same.

また、本実施例は、この通路用足場3の形成に折り畳み自在且つ組み立て分解自在な吊り足場体7を用いており、この吊り足場体7は、折り畳み分解自在に構成された枠体7Aと、この枠体7Aに敷設する足場板7Bとからなるものである。 Further, in this embodiment, a folding scaffold 7 that is foldable and can be assembled and disassembled is used to form the passage scaffold 3, and the suspension scaffold 7 includes a frame body 7A that is foldable and disassembleable. The scaffolding plate 7B is laid on the frame 7A.

具体的には、枠体7Aは、図13に示すように、複数(例えば四本)の梁部材7aと、この梁部材7a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7bと、梁部材7aの回動軸となると共にこの梁部材7aと梁連結部材7bとの連結を保持する連結保持軸7cとを備え、梁部材7aの端部に設けられている軸挿通孔7dと、梁連結部材7bに設けられている軸挿通孔7e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7c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7cを抜き取ることで梁連結部材7bから梁部材7a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。 Specifically, as shown in FIG. 13, the frame 7A includes a plurality of (for example, four) beam members 7a and a beam connection in which the ends of the beam members 7a are horizontally rotatable and detachably connected. A member 7b and a connection holding shaft 7c that serves as a rotation axis of the beam member 7a and holds the connection between the beam member 7a and the beam connection member 7b are provided, and a shaft insertion provided at the end of the beam member 7a. The hole 7d and the shaft insertion hole 7e provided in the beam connection member 7b are made to communicate with each other to form a shaft insertion communication hole, and the connection holding shaft 7c is inserted and arranged in the shaft insertion communication hole to form an assembly. In this assembled state, the beam holding member 7a can be separated and removed from the beam connecting member 7b by pulling out the connecting holding shaft 7c inserted through the shaft inserting communication hole. It is configured.

即ち、本実施例の通路用足場形成工程は、出入部10を足場にして、この出入部10に梁部材7aと梁連結部材7bと連結保持軸7cにより折り畳み状態にした枠体7A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枠体7Aを水平回動操作して展開状態にし、この展開状態の枠体7Aに足場板7Bを敷設すると共に、この枠体7Aに橋桁1bから吊下した吊設具11(例えば足場チェーン等)を連結して、通路用足場3となる最初の吊り足場体7を形成し、次いで、この最初の吊り足場体7を足場にしてこの最初の吊り足場体7を形成している枠体7Aに、更に梁部材7aと梁連結部材7bと連結保持軸7cを用いて折り畳み状態の新たな枠体7A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枠体7Aを水平回動操作して展開状態にし、この展開状態の枠体7Aに足場板7Bを敷設すると共にこの枠体7Aに橋桁1bから吊下した吊設具11を連結して最初の吊り足場体7に連設される新たな吊り足場体7を形成し、この新たな吊り足場体7を連設する作業を繰り返して通路用足場3を橋桁1bに沿って延設してゆくものである。 That is, in the step of forming a scaffold for passages of this embodiment, the entrance/exit portion 10 is used as a scaffold, and the entrance/exit portion 10 is assembled with the frame member 7A in a folded state by the beam member 7a, the beam connecting member 7b, and the connection holding shaft 7c. Then, the frame body 7A assembled and formed in the folded state is horizontally rotated to the expanded state, the scaffolding plate 7B is laid on the frame body 7A in the expanded state, and the frame body 7A is hung from the bridge girder 1b. The first suspending scaffold 7 is formed by connecting the suspending tools 11 (for example, a scaffolding chain) to form the first suspending scaffold 7 that becomes the scaffold 3 for passages. A new frame body 7A in the folded state is assembled and formed on the frame body 7A forming the frame 7 by further using the beam member 7a, the beam connecting member 7b, and the connection holding shaft 7c, and the new frame body 7A formed in this folded state is assembled. The frame body 7A is horizontally rotated to a deployed state, the scaffolding plate 7B is laid on the frame body 7A in the deployed state, and the suspension tool 11 suspended from the bridge girder 1b is connected to the frame body 7A to start the first operation. Forming a new suspension scaffold 7 connected to the suspension scaffold 7, and repeating the work of continuously installing the new suspension scaffold 7 to extend the passage scaffold 3 along the bridge girder 1b. Is.

なお、本実施例の通路用足場3は、吊り足場体7同士が枠体7A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体7に吊設具11を連結して橋桁1bから吊設した状態にする必要は無く、吊設する吊り足場体7は適宜設定されるものとする。 The passage scaffold 3 of this embodiment has a continuous structure in which the suspended scaffolds 7 share a part of the frame 7A, so that the suspension tool 11 is not necessarily connected to all the suspended scaffolds 7. It is not necessary to suspend the suspension scaffold 7 from the bridge girder 1b, and the suspension scaffolding body 7 to be suspended is appropriately set.

(2)作業用足場形成工程
本実施例の作業用足場形成工程は、前述した通路用足場形成工程の次に行う工程であり、図2に示すように、通路用足場形成工程で形成した通路用足場3に連設するようにして、工事対象の橋脚1aの周囲に仮締切り構造体2を構築する際の足場となる作業用足場4を形成する工程である。
(2) Working scaffold forming step The working scaffold forming step of the present embodiment is a step performed after the above-mentioned passage scaffold forming step, and as shown in FIG. 2, the passage formed in the passage scaffold forming step. This is a step of forming work scaffolds 4 that are to be used as scaffolds when constructing the temporary cut-off structure 2 around the pier 1a to be constructed by connecting the scaffolds 3 to each other.

具体的には、通路用足場形成工程における通路用足場3を形成する際に用いる吊り足場体7と同じ吊り足場体7を用いて作業用足場4を形成してゆく。 Specifically, the working scaffold 4 is formed by using the same hanging scaffolding body 7 as that used when forming the scaffolding 3 for passages in the step of forming scaffolding for passages.

より具体的には、先に形成した通路用足場3の端部、具体的には、通路用足場3を形成している吊り足場体7の枠体7Aの端部に、通路用足場3を足場にして、通路用足場形成工程での作業と同様に、梁部材7aと梁連結部材7bと連結保持軸7cにより折り畳み状態の枠体7A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枠体7Aを水平回動操作して展開状態にし、この展開状態の枠体7Aに足場板7Bを敷設すると共にこの枠体7Aに橋桁1bに設けた昇降機能付き吊設具6(例えばチェーンブロック)を連結して、作業用足場4となる最初の吊り足場体7を吊設形成し、次いで、この最初の吊り足場体7を足場にしてこの最初の吊り足場体7を形成している枠体7Aに、更に梁部材7aと梁連結部材7bと連結保持軸7cを用いて折り畳み状態の新たな枠体7A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枠体7Aを水平回動操作して展開状態にし、この展開状態の枠体7Aに足場板7Bを敷設すると共にこの枠体7Aに橋桁1bに設けた昇降機能付き吊設具6を連結して最初の吊り足場体7に連設される新たな吊り足場体7を吊設形成し、この新たな吊り足場体7を連設する作業を繰り返して、図14に示すように、工事対象の橋脚1aの周囲に作業用足場4を形成してゆく。 More specifically, the passage scaffold 3 is attached to the end of the previously formed passage scaffold 3, specifically, to the end of the frame body 7A of the suspended scaffold 7 forming the passage scaffold 3. As a scaffold, similarly to the work in the step of forming a scaffold for passages, the frame member 7A in the folded state is assembled and formed by the beam member 7a, the beam connecting member 7b, and the connection holding shaft 7c, and the frame body assembled in this folded state is formed. 7A is horizontally rotated to a deployed state, a scaffolding plate 7B is laid on the frame body 7A in this deployed state, and a lifting tool 6 with lifting function (for example, a chain block) provided on the bridge girder 1b is mounted on the frame body 7A. The first suspension scaffolding 7 which is connected to form the working scaffold 4 is hung and formed, and then the first suspension scaffolding 7 is used as a scaffold to form the first suspension scaffolding 7 Further, a new frame body 7A in a folded state is assembled and formed using the beam member 7a, the beam connecting member 7b, and the connection holding shaft 7c, and the newly formed frame body 7A is horizontally rotated in this folded state. To the unfolded state, and the scaffolding plate 7B is laid on the frame 7A in this unfolded state, and the lifting device 6 with the lifting function provided on the bridge girder 1b is connected to the frame 7A to be continuously connected to the first hanging scaffolding 7 A new suspended scaffold 7 is hung and formed, and the work of continuously arranging the new suspended scaffold 7 is repeated, and as shown in FIG. 14, the work scaffold 4 is provided around the pier 1a to be constructed. Form.

なお、通路用足場形成工程及び作業用足場形成工程において、吊り足場体7を用いて通路用足場3及び作業用足場4を形成する際、図15に示すように、複数の枠体7Aを折り畳み状態で連設形成し、その後、いずれか一体の枠体7Aを水平回動操作して展開状態にすることで、連設する他の枠体7Aを個別に展開操作しなくても、この水平回動操作した枠体7A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、効率良く通路用足場3及び作業用足場4を形成してゆくことができる。 In addition, in forming the passage scaffold 3 and the work scaffold 4 using the suspension scaffolding 7 in the passage scaffold formation step and the work scaffold formation step, as shown in FIG. 15, a plurality of frame bodies 7A are folded. In this state, one of the frame bodies 7A is connected to each other, and then any one of the frame bodies 7A is horizontally rotated to be in a deployed state. The frame 7A that has been pivotally operated can be brought into the deployed state at the same time in association with the deploying operation, and the aisle scaffold 3 and the work scaffold 4 can be efficiently formed.

(3)作業用足場吊り替え工程
本実施例の作業用足場吊り替え工程は、前述した作業用足場形成工程の次に行う工程であり、作業用足場形成工程において橋梁1の橋桁1bに吊設形成した作業用足場4を橋脚1aに設けた受替え梁5に吊り替える工程である。
(3) Work scaffold suspension process The work scaffold suspension process of this embodiment is a process performed after the work scaffold formation process described above, and is suspended on the bridge girder 1b of the bridge 1 in the work scaffold formation process. This is a step of suspending the formed work scaffold 4 on the interchange beam 5 provided on the pier 1a.

即ち、この作業用足場吊り替え工程は、作業用足場4を橋桁1bから橋脚1aに設けた受替え梁5に吊り替えることにより、重量物である仮締切り構造体2を作業用足場4上で構築した際の荷重が橋桁1bに加わることを回避し、加重による橋桁1bへの悪影響が生じず、安心して作業用足場4上で仮締切り構造体2を構築することを目的として行われるものである。 That is, in this work scaffold resuspension process, the temporary scaffolding structure 2 which is a heavy object is suspended on the work scaffold 4 by suspending the work scaffold 4 from the bridge girder 1b to the interchange beam 5 provided on the pier 1a. The purpose is to prevent the load from being applied to the bridge girder 1b when it is built, to prevent the bridge girder 1b from being adversely affected by weighting, and to build the temporary shut-off structure 2 on the work scaffold 4 with peace of mind. is there.

具体的には、本実施例の作業用足場吊り替え工程は、図3に示すように、通路用足場3を介して受替え梁形成部材5a(受替え梁5を分解状態にしたもの)を作業用足場4に搬入した後、昇降機能付き吊設具6の操作により作業用足場4の一部若しくは全体を上昇させ、この上昇させた作業用足場4を利用して、受替え梁形成部材5aを用いて、図16に示すように、工事対象の橋脚1a上に受替え梁5(本実施例では図示するようにトラス梁を採用)を設け、図4に示すように、この橋脚1aに設けた受替え梁5に作業用足場4を形成する吊り足場体7を吊り替え前と同様、昇降機能付き吊設具6を用いて昇降自在に吊り替え吊設する。 Specifically, in the work scaffold suspending process of the present embodiment, as shown in FIG. 3, the exchange beam forming member 5a (the exchange beam 5 is disassembled) is inserted through the passage scaffold 3 as shown in FIG. After being loaded into the work scaffold 4, a part or the whole of the work scaffold 4 is lifted by operating the lifting tool 6 with the lifting function, and the lift beam forming member is used by using the lifted work scaffold 4. As shown in FIG. 16, a replacement beam 5 (a truss beam is used as shown in this embodiment) is provided on the pier 1a to be constructed by using the 5a, and as shown in FIG. The suspending scaffolding body 7 forming the work scaffolding 4 is suspended and lifted up and down by the lifting beam 5 having the lifting function, similarly to before the lifting up.

また、本実施例の作業用足場吊り替え工程においては、吊り替え作業完了後、昇降機能付き吊設具6を操作して、図5に示すように、作業用足場4を元の高さ位置(通路用足場3と同じ高さ位置)よりも降下させて、作業用足場4と橋梁1(橋桁1b)との間の高さ空間を広げ、次工程の下部側仮締切り構造体構築工程における下部側仮締切り構造体2aの構築空間を確保している。なお、作業用足場4の降下位置は構築する下部側仮締切り構造体2aの高さにより適宜変更可能なものとする。 Further, in the work scaffold suspending process of the present embodiment, after the suspending work is completed, the elevating function-equipped suspending tool 6 is operated to move the work scaffold 4 to the original height position as shown in FIG. (The same height position as the aisle scaffold 3) to lower the space between the work scaffold 4 and the bridge 1 (bridge girder 1b), in the lower temporary cutoff structure construction process of the next process A construction space for the lower temporary cutoff structure 2a is secured. Note that the descending position of the work scaffold 4 can be appropriately changed depending on the height of the lower temporary cutoff structure 2a to be constructed.

(4)下部側仮締切り構造体構築工程
本実施例の下部側仮締切り構造体構築工程は、前述した作業用足場吊り替え工程の次に行う工程であり、作業用足場吊り替え工程において橋桁1bから橋脚1aに設けた受替え梁5に吊り替え吊設した作業用足場4上で、仮締切り構造体2の下部側となる下部側仮締切り構造体2aを構築する工程である。
(4) Lower Side Temporary Shutoff Structure Building Step The lower side temporary shutoff structure building step of this embodiment is a step to be performed after the above-mentioned work scaffold suspending step, and the bridge girder 1b is used in the work scaffold suspending step. Is a step of constructing a lower temporary cut-off structure 2a, which is the lower side of the temporary cut-off structure 2, on the work scaffold 4 suspended and suspended from the interchange beam 5 provided on the bridge pier 1a.

具体的には、先ず、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2a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通路用足場3を介して作業用足場4まで作業者が持ち運び搬入する。 Specifically, first, a bottom plate forming member and a peripheral wall forming member (liner plate) for forming the lower temporary cutoff structure 2a which is formed in advance to a size that an operator can hold and carry by hand. ) Etc. are carried by a worker from the land to the work scaffold 4 through the passage scaffold 3 from the land.

次いで、この作業用足場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用足場4上で組み立てて、図6に示すように、作業用足場4上に下部側仮締切り構造体2aを構築する。 Next, the temporary cut-off structure forming member for the lower side that has been carried into the scaffold 4 for work is assembled on the scaffold 4 for work, and as shown in FIG. To build.

より具体的には、作業用足場4上に、工事対象の橋脚1a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2aを構築する。 More specifically, a bottom plate portion having a ring shape in plan view is formed on the scaffold 4 for work so as to surround the pier 1a to be constructed, and a peripheral wall portion having a predetermined height along the outer peripheral edge portion of the bottom plate portion. Is formed upright to construct a bottomed tubular lower temporary shut-off structure 2a.

(5)下部側仮締切り構造体設置工程
本実施例の下部側仮締切り構造体設置工程は、前述した下部側仮締切り構造体構築工程の次に行う工程であり、下部側仮締切り構造体構築工程において作業用足場4上に構築した下部側仮締切り構造体2aを水域中に設置する工程である。
(5) Lower Side Temporary Deadline Structure Installation Step The lower side temporary deadline structure installation step of this embodiment is a step that follows the lower side temporary deadline structure construction step described above. In this step, the lower temporary cutoff structure 2a constructed on the work scaffold 4 is installed in the body of water.

具体的には、先ず、作業用足場4上に構築した下部側仮締切り構造体2aを昇降移動させるための昇降装置8(例えば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)を工事対象の橋脚1aに設け、この昇降装置8と下部側仮締切り構造体2aとを連結し、この昇降装置8により下部側仮締切り構造体2aを上昇させ、作業用足場4に対して浮上状態にする。なお、昇降装置8は、受替え梁5に設けても良い。 Specifically, first, a construction object is an elevating device 8 (for example, an elevating device composed of a balance holding balance and a chain block) for moving up and down the lower temporary shut-off structure 2a constructed on the work scaffold 4. Is provided on the bridge pier 1a, and the elevating device 8 is connected to the lower temporary cutoff structure 2a. The elevating device 8 raises the lower temporary cutoff structure 2a so that the work scaffold 4 is levitated. .. The lifting device 8 may be provided on the interchange beam 5.

次いで、図7及び図17に示すように、作業用足場4に下部側仮締切り構造体2aが通過可能な大きさの開口部9を、吊り上げ浮上させた下部側仮締切り構造体2aの真下に、作業用足場4(具体的には、作業用足場4を形成している吊り足場体7)を撤去して形成する。 Next, as shown in FIGS. 7 and 17, an opening 9 having a size that allows the lower temporary cutoff structure 2a to pass through the work scaffold 4 is provided directly below the lower temporary cutoff structure 2a that is lifted and floated. The scaffold 4 for work (specifically, the suspended scaffolding body 7 forming the scaffold 4 for work) is removed and formed.

具体的には、先ず、開口部形成領域(撤去領域)の中心部に位置する吊り足場体7の足場板7Bを取り外して枠体7Aを露出させ、枠体7A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枠体7Aの軸挿通連通孔に挿通配設されている連結保持軸7cを抜き取り、梁連結部材7bから梁部材7aを取り外し撤去し、次いで、この撤去した吊り足場体7に連設している別の吊り足場体7を同様の手順で撤去する。 Specifically, first, the scaffolding plate 7B of the suspension scaffolding body 7 located in the center of the opening forming region (removal region) is removed to expose the frame body 7A, and the frame body 7A is pulled toward the scaffolding side and folded. Then, the connection holding shaft 7c inserted through the shaft insertion communication hole of the frame body 7A in the folded state is removed, the beam member 7a is removed from the beam connection member 7b, and then the removed suspension scaffolding body is removed. The other suspended scaffolding 7 connected to 7 is removed by the same procedure.

次いで、昇降装置8を操作して、図8に示すように、作業用足場4に形成した開口部9を介して下部側仮締切り構造体2aを降下させ、この下部側仮締切り構造体2aを水域中に設置する。なお、図示しないが、この下部側仮締切り構造体2aを降下させる際、橋脚1aと下部側仮締切り構造体2aの夫々にガイドレールを設け、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2aを安定状態で水域中に降下させることができる。 Then, the elevating device 8 is operated to lower the lower side temporary shut-off structure 2a through the opening 9 formed in the work scaffold 4 as shown in FIG. Install in water. Although not shown, when lowering the lower temporary shut-off structure 2a, a guide rail is provided on each of the pier 1a and the lower temporary shut-off structure 2a, and the lower rail is lowered along the guide rails. The temporary cutoff structure 2a can be dropped into the water area in a stable state.

(6)作業用足場降下工程
本実施例の作業用足場降下工程は、前述した下部側仮締切り構造体設置工程の次に行う工程であり、下部側仮締切り構造体設置工程において水域中に設置した下部側仮締切り構造体2a上に仮締切り構造体2の上部側となる上部側仮締切り構造体2bを直接積み上げ形成(構築)する際の足場となる作業用足場4を、下部側仮締切り構造体2aの上部位置付近まで降下させる工程である。
(6) Work scaffold descending process The work scaffold descending process is a process performed after the lower temporary cutoff structure installation process described above, and is installed in the water in the lower temporary shutoff structure installation process. The working temporary scaffolding 4 serving as a scaffold for directly stacking (constructing) the upper temporary shutoff structure 2b, which is the upper side of the temporary shutoff structure 2, is formed on the lower temporary shutoff structure 2a. This is a step of lowering the structure 2a to near the upper position.

具体的には、降下させる作業用足場4は、前工程の下部側仮締切り構造体設置工程において下部側仮締切り構造体2aを降下させるために形成した開口部9を開口させたままとし、作業用足場吊り替え工程において作業用足場4に連結した昇降機能付き吊設具6の操作により降下させる。 Specifically, the work scaffold 4 to be lowered leaves the opening 9 formed for lowering the lower temporary cutoff structure 2a in the lower temporary cutoff structure installation step of the previous process, and the work is performed. In the scaffold suspending process, the lifting tool 6 with the lifting function connected to the work scaffold 4 is lowered.

なお、本実施例の作業用足場降下工程においては、図9に示すように、水域中に設置した下部側仮締切り構造体2aの上端部と作業用足場4とがほぼ面一状態となるように降下移動させているが、例えば、下部側仮締切り構造体2aの上部が作業用足場4の開口部9からやや突出状態となる高さ位置まで作業用足場4を降下させても良い。 In addition, in the work scaffold descending process of the present embodiment, as shown in FIG. 9, the work scaffold 4 and the upper end of the lower temporary cutoff structure 2a installed in the water area are substantially flush with each other. However, for example, the work scaffold 4 may be lowered to a height position where the upper portion of the lower temporary cutoff structure 2 a is slightly projected from the opening 9 of the work scaffold 4.

(7)上部側仮締切り構造体構築工程
本実施例の上部側仮締切り構造体構築工程は、前述した作業用足場降下工程の次に行う工程であり、下部側仮締切り構造体設置工程において水域中に設置した下部側仮締切り構造体2a上に仮締切り構造体2の上部側となる上部側仮締切り構造体2bを直接積み上げ形成(構築)する工程である。
(7) Upper Temporary Shutoff Structure Construction Step The upper temporary shutoff structure construction step of this embodiment is a step that is performed after the above-mentioned work scaffold descending step, and is a water area in the lower temporary shutoff structure installation step. This is a step of directly stacking (constructing) the upper temporary cutoff structure 2b, which is the upper side of the temporary cutoff structure 2, on the lower temporary cutoff structure 2a installed therein.

具体的には、図10に示すように、先ず、作業用足場降下工程において下部側仮締切り構造体2aの上部位置に合わせて降下移動させた作業用足場4を足場にして下部側仮締切り構造体2aの上端部上に直接、周壁形成部材を直接積み上げ構築してゆき上部側仮締切り構造体2bを構築する。 Specifically, as shown in FIG. 10, first, in the work scaffold descending step, the work temporary scaffold 4 moved down according to the upper position of the lower temporary cutoff structure 2a is used as a scaffold to form the lower temporary cutoff structure. The peripheral wall forming member is directly stacked on the upper end portion of the body 2a to be constructed, and the upper side temporary cutoff structure 2b is constructed.

より具体的には、例えば構築途中の上部側仮締切り構造体2bの高さがある程度の高さに到達したら、この構築途中の上部側仮締切り構造体2bの上端部位置に合わせて作業用足場4を上昇し、再び、この構築途中の上部側仮締切り構造体2b上に更に上部側仮締切り構造体2bを構築するための周壁形成部材を積み上げ構築してゆき、以降、上部側仮締切り構造体2bが所定の高さになるまで同様の作業を繰り返して、上部側仮締切り構造体2bを構築する。 More specifically, for example, when the height of the upper temporary cutoff structure 2b in the middle of construction reaches a certain level, the work scaffold is aligned with the upper end position of the upper temporary cutoff structure 2b in the middle of construction. 4, the peripheral wall forming member for building the upper temporary cut-off structure 2b is further stacked on the upper temporary cut-off structure 2b in the middle of the construction, and the upper temporary cut-off structure is formed. The same operation is repeated until the body 2b reaches a predetermined height to construct the upper temporary cutoff structure 2b.

次に、図11に示すように、この完成した仮締切り構造体2の浮上を防止するための浮上防止用部材12を橋脚1aに設け、この浮上防止用部材12で仮締切り構造体2の上端部を押さえ、仮締切り構造体2の浮上を防止する。 Next, as shown in FIG. 11, a levitation prevention member 12 for preventing levitation of the completed temporary cutoff structure 2 is provided on the pier 1a, and the upper end of the temporary cutoff structure 2 is provided by the levitation prevention member 12. The temporary shutoff structure 2 is prevented from floating.

このように、本実施例の上部側仮締切り構造体構築工程は、下部側仮締切り構造体2aを直接、下部側仮締切り構造体2a上に構築してゆくから、従来工法において行われていた上部側仮締切り構造体2bを構築する際の下部側仮締切り構造体2aを降下させるために作業用足場4に開口した開口部9の閉口作業、作業用足場4上で構築した上部側仮締切り構造体2bを昇降させる上部側仮締切り構造体昇降操作及び上部側仮締切り構造体2bを降下させるために作業用足場4に開口部9を形成する開口部形成作業等の上部側仮締切り構造体2bを構築する際の付帯作業が不要になり、上部側仮締切り構造体構築工程が簡易になり、更に、作業進捗に合わせて作業用足場4の高さ位置を調整することで、構築作業時に梯子等の使用が不要となり安全に効率的に作業を行うことができる。 In this way, the upper temporary cutoff structure construction step of the present embodiment is performed by the conventional method because the lower temporary cutoff structure 2a is directly built on the lower temporary cutoff structure 2a. Closing work of the opening 9 opened in the work scaffold 4 for lowering the lower temporary cutoff structure 2a when constructing the upper temporary cutoff structure 2b, and the upper temporary cutoff constructed on the work scaffold 4 Upper temporary cut-off structure for raising/lowering the structure 2b and upper temporary cut-off structure for forming an opening 9 in the work scaffold 4 for raising and lowering the upper temporary cut-off structure 2b No additional work is required when building 2b, the upper temporary cutoff structure building process is simplified, and by adjusting the height position of the work scaffold 4 according to the work progress, it is possible to perform Since it is not necessary to use a ladder or the like, work can be performed safely and efficiently.

(8)ドライエリア形成工程
本実施例のドライエリア形成工程は、前述した上部側仮締切り構造体構築工程の次に行う本実施例の仮締切り工法における最終工程であり、水域中に設置した仮締切り構造体2の底部の橋脚貫通孔(図示省略)と橋脚1a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2内に入り込んでいる水を排水して、この仮締切り構造体2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。
(8) Dry Area Forming Step The dry area forming step of this example is the final step in the temporary cutoff method of this example, which is performed after the above-described upper temporary cutoff structure construction step, and is temporarily installed in the water area. Water-stop treatment is performed on the gap formed between the bridge pier through hole (not shown) at the bottom of the cutoff structure 2 and the pier 1a, and the water that has entered the temporary cutoff structure 2 is drained. This is a step of forming a working dry area (non-water area) in the temporary cutoff structure 2.

具体的には、先ず、止水シートやゴム製の止水チューブ等の止水手段(図示省略)を、仮締切り構造体2の底部の橋脚貫通孔と橋脚1a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, first, a water blocking means (not shown) such as a water blocking sheet or a rubber water blocking tube is formed between the bridge pier through hole at the bottom of the temporary cutoff structure 2 and the bridge pier 1a. It is placed in a closed state and a water blocking treatment is performed to prevent water from entering through this gap.

次いで、この止水処理完了後に、図12に示すように、仮締切り構造体2内の水をポンプ等の排水装置13を用いて排水して、この仮締切り構造体2内に作業用のドライエリアを形成する。 Then, after completion of the water stopping process, as shown in FIG. 12, the water in the temporary cutoff structure 2 is drained by using a drainage device 13 such as a pump, and the temporary dry cutout structure 2 is dried for work by using a drainage device 13. Form an area.

なお、本実施例は、このドライエリア形成工程においても図示するように作業用足場4を所望の位置に移動させて、この作業用足場4を足場にして作業を行うことで、安全且つ効率的に作業を行うことができる。 In this embodiment, the scaffold 4 for work is moved to a desired position as shown in the drawing also in this dry area forming process, and the scaffold 4 for work is used as a scaffold to perform work, so that it is safe and efficient. Can work on it.

また、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。 Further, the present invention is not limited to the present embodiment, and the specific constitution of each constituent element can be appropriately designed.

1 橋梁
1a 橋脚
2 仮締切り構造体
2a 下部側仮締切り構造体
2b 上部側仮締切り構造体
3 通路用足場
4 作業用足場
5 受替え梁
6 昇降機能付き吊設具
7 吊り足場体
7a 梁部材
7b 梁連結部材
7c 連結保持軸
7d 軸挿通孔
7e 軸挿通孔
1 Bridge 1a Bridge Pier 2 Temporary Closing Structure 2a Lower Temporary Closing Structure 2b Upper Temporary Closing Structure 3 Passage Scaffold 4 Working Scaffold 5 Interchange Beam 6 Lifting Tool with Lifting Function 7 Suspension Scaffold 7a Beam Member 7b Beam connection member 7c Connection holding shaft 7d Shaft insertion hole 7e Shaft insertion hole

Claims (6)

水域上に架設される橋梁の補修・補強工事を行う対象の橋脚の周囲に作業用のドライエリアを形成するための仮締切り構造体を設置する橋脚補修・補強工事に用いる仮締切り構造体の設置工法であって、前記橋梁に沿って作業者が通行する通路用足場を形成する通路用足場形成工程と、前記通路用足場と連設され前記仮締切り構造体を構築する際の足場となる作業用足場を前記橋脚の周囲に形成する作業用足場形成工程と、前記作業用足場上で前記仮締切り構造体の下部側となる下部側仮締切り構造体を構築する下部側仮締切り構造体構築工程と、前記下部側仮締切り構造体を水域中に設置する下部側仮締切り構造体設置工程と、前記作業用足場を水域中に設置された前記下部側仮締切り構造体の上部位置まで降下させる作業用足場降下工程と、水域中に設置された前記下部側仮締切り構造体の上部位置まで降下させた前記作業用足場を足場にして前記下部側仮締切り構造体上に前記仮締切り構造体の上部側となる上部側仮締切り構造体を直接構築する上部側仮締切り構造体構築工程とを有することを特徴とする橋脚補修・補強工事に用いる仮締切り構造体の設置工法。 Install a temporary cut-off structure to form a dry area for work around the bridge pier to be repaired/reinforced on the water area.Install a temporary cut-off structure used for bridge pier repair/reinforcement work. A construction method, which is a scaffold forming step for forming a passage scaffold through which a worker passes along the bridge, and a scaffold for constructing the temporary cut-off structure connected to the scaffold for passage. Scaffolding forming step for forming work scaffolding around the pier, and lower side temporary shutoff structure building step for constructing a lower side temporary shutoff structure which is a lower side of the temporary shutoff structure on the working scaffold And a lower temporary cutoff structure installation step of installing the lower temporary cutoff structure in the water area, and a work of lowering the work scaffold to an upper position of the lower temporary cutoff structure installed in the water area Scaffold descending step and upper part of the temporary cutoff structure on the lower temporary cutoff structure using the working scaffold lowered to the upper position of the lower temporary cutoff structure installed in the water area as a scaffold And an upper temporary cutoff structure constructing step for directly constructing an upper temporary cutoff structure to be a side. 前記橋梁の前記橋脚に受替え梁を設け、この受替え梁に前記作業用足場を吊り替える作業用足場吊り替え工程を有することを特徴とする請求項1記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法。 A temporary beam used for bridge pier repair/reinforcement work according to claim 1, characterized in that a replacement beam is provided on the bridge pier of the bridge, and there is a work scaffold suspension process of suspending the work scaffold on the interchange beam. Installation method for deadline structure. 前記作業用足場上で前記下部側仮締切り構造体を構築する前に若しくは構築途中で、前記作業用足場を降下させて前記下部側仮締切り構造体の構築空間を確保することを特徴とする請求項1,2のいずれか1項に記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法。 The construction space for the lower temporary cut-off structure is secured by lowering the working scaffold before or during the construction of the lower temporary shut-off structure on the working scaffold. Item 1. An installation method of a temporary cutoff structure used for pier repair/reinforcement work according to any one of items 1 and 2. 前記作業用足場形成工程において昇降機能付き吊設具を介して前記作業用足場を前記橋梁に昇降自在に吊設することを特徴とする請求項1〜3のいずれか1項に記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法。 The pier repair according to any one of claims 1 to 3, wherein the working scaffold is suspended from the bridge via a lifting tool with an elevating function in the working scaffold formation step so as to be capable of ascending and descending.・Installation method for temporary cutoff structure used for reinforcement work. 複数の梁部材と、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と、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とを備え、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折り畳み分解自在な吊り足場体を用いて前記作業用足場を形成することを特徴とする請求項1〜4のいずれか1項に記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法。 A plurality of beam members, a beam connecting member to which end portions of the beam members are horizontally rotatable and detachably connected, and a rotating shaft of the beam member, and a connection between the beam member and the beam connecting member. And a connection holding shaft for holding the shaft insertion hole provided in the end portion of the beam member and the shaft insertion hole provided in the beam connection member are in communication with each other to form a shaft insertion communication hole. It is possible to assemble and form the connecting and holding shaft by inserting and arranging the connecting and holding shaft into the shaft inserting and communicating hole, and to pull out the connecting and holding shaft which is inserted and arranged in the shaft inserting and communicating hole in the assembled and formed state. 5. The working scaffold is formed by using a folding and disassembling hanging scaffolding body capable of separating and removing the beam member from the beam connecting member. Installation method of temporary cutoff structure used for pier repair and reinforcement work described in. 前記吊り足場体を用いて前記通路用足場を形成することを特徴とする請求項5記載の橋脚補修・補強工事に用いる仮締切り構造体の設置工法。 The method for installing a temporary cut-off structure used for bridge pier repair/reinforcement work according to claim 5, wherein the suspension scaffolding is used to form the passage scaffolding.
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