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

Abstract

PROBLEM 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

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.

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.

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.

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.

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.

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.

The gist of the present invention will be described with reference to the accompanying drawings.

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.

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.

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.

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.

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.

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.

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.

It is explanatory drawing front sectional drawing (a) and explanatory side view (b) which show the bridge before construction in a present Example. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. It is a description disassembled perspective view which shows the suspension scaffold used for a present Example. It is an explanatory plan view showing a work scaffold formed in the work scaffold formation step of the present embodiment. 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. .. It is a side view which shows the interchange beam in a present Example. 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.

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

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.

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.

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.

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.

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.

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.

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.

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.

Specific embodiments of the present invention will be described with reference to the drawings.

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.

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.

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) 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.

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.

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.

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.

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.

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) 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.

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.

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.

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) 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.

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.

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.

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) 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.

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.

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.

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) 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.

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.

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.

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.

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) 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.

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.

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) 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.

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.

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.

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.

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) 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.

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.

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.

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.

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

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)

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. 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. 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. 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. 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. 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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