JP2005232677A - Suspended scaffold assembling method, suspended scaffold disassembling method, and movable suspending tool for use therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suspended scaffold assembling method and a suspended scaffold disassembling method which bring reduction of a high-altitude workload and reduction of working steps without mounting of additional members to a main girder or working of the same beforehand, and are implemented by requiring minimum traffic regulation if necessary, and to provide a movable suspending tool for use in the methods. <P>SOLUTION: According to the suspended scaffold assembling method, by rolling the movable suspending tool 20 on a lower flange 1a of the main girder 1 of a bridge 9, a parent child pipe 4 is suspended on a workbench 30 in the vicinity of a pier 9 to assemble a suspended scaffold 40 for one unit, and then the assembled unit is moved and set to another pier 9, followed by repeatedly assembling the suspended scaffold 40 for the following units, on the workbench 30. In this manner only by moving the movable suspending tool 20 on the lower flange 1a of the main girder 1, necessity of preliminary mounting of a rail is dispensed with, and therefore corrosion of the rail by rainwater is eliminated. Further, only by assembling the suspended scaffold 40 for one unit, on the workbench 30 in the vicinity of the pier 9 and moving the assembled unit by means of the movable suspending 20, high-altitude workload on an overhanging location is reduced, and assembling of the suspended scaffold is efficiently carried out in a short period of time. Further, necessity of traffic regulation is drastically reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for assembling a suspension scaffold, a method for disassembling, and a movable suspension jig used therefor, which can be assembled on a work table near a pier, and can be moved and installed using a main girder as it is. About.

  When it is necessary to perform various operations such as painting work for bridge construction, high ten bolt tightening work, or attachment work, it is necessary to install a suspension scaffold.

  For example, as shown in FIG. 4, such a suspension scaffold has a hanging bracket 2 attached in advance to a main girder 1 of a bridge, a chain 3 is hung on the hanging bracket 2, and a cage pipe 4 is hung. The roller 5 is passed over the pipe 4, the scaffold plate 6 is placed on the roller 5 and fixed, the handrail 7 is provided on both ends of the scaffold plate 6, and the net 8 is provided at the lower portion.

  When installing such a suspension scaffold, it is necessary for the worker to assemble from the end of the pier one after another, which takes a long time to assemble and is a work at a high place, and when the bridge is on the road. There is a need for traffic regulation.

  Therefore, as shown in FIG. 5, Patent Document 1 discloses a bridge movable protective work 10 in which a rail 11 is attached in advance to the lower flange 1a of the main girder 1 by welding or the like. 11 assemble a movable scaffold 14 by suspending the cage pipe 4 via a jig 13 having a roller 12 movable on the upper part 11 and moving it so that it can be pulled out sequentially, and installed. Dismantling is done in the reverse order of installation.

As a result, the process of assembling and dismantling the protective work is shortened and the safety level is increased.
Japanese Patent Laid-Open No. 5-295712

  However, since the jig 13 is moved in the mobile protective work 10 described above, it is necessary to weld the rail 11 to the main girder 1 in advance, which increases the number of man-hours and costs, and various types of work on the suspension scaffold 14. After the work is completed, if the installation is approved and the rail 11 is left attached, there is a problem that rainwater accumulates on the lower flange 1a of the main girder 1 and causes corrosion.

  The present invention has been made in view of the problems of the prior art, and does not require the attachment or processing of members in advance in the main girder, and it is intended to reduce work at high places and shorten work processes and to regulate traffic. It is an object of the present invention to provide a method for assembling and disassembling a suspension scaffold that can be minimized, and a movable suspension jig used for these.

  In order to solve the above-mentioned problem, the method for assembling a suspension scaffold according to claim 1 of the present invention is a work near the pier via a movable suspension jig that can move by rolling on the lower flange of the main girder of the bridge. After assembling the suspension scaffold for one unit by hanging the cocoon pipe on the table, move to the other pier side and install it, and assemble the next one scaffold for the unit on the workbench It is characterized by being repeated.

  According to the method of assembling the suspension scaffold, one unit is formed by suspending a gouger pipe on a work table near the pier via a movable suspension jig that can move by rolling on the lower flange of the main girder of the bridge. After assembling the suspension scaffold for the second minute, move to the other pier side, install it, and repeat the assembly of the next one scaffold for the unit on the workbench. By moving on the lower flange of the main girder, there is no need to attach rails in advance, and there is no problem of corrosion due to rainwater. By moving, the work in high places while overhanging can be reduced, it can be assembled efficiently in a short time, and the need for traffic regulation can be greatly shortened.

  According to a second aspect of the present invention, there is provided a method for assembling a suspended scaffold, in addition to the structure according to the first aspect, after moving with the movable suspension jig, replacing the suspended scaffold with a fixed suspension jig. It is characterized by being installed.

  According to this method of assembling a suspension scaffold, after moving with the movable suspension jig, the suspension scaffold is installed by replacing it with a stationary suspension jig. By changing the scale, the required number of mobile lifting jigs can be greatly reduced, and the installation cost of the suspension scaffolding can be reduced.

  Further, the disassembly method of the suspension scaffold according to claim 3 of the present invention is assembled by suspending the cage pipe through a movable suspension jig that is movable by rolling on the lower flange of the main girder of the bridge. The suspended scaffolding is separated into units, moved onto a workbench near the pier, and disassembled repeatedly.

  According to the method of dismantling the suspension scaffold, one unit of the suspension scaffold assembled by suspending the cage pipe through the movable suspension jig that can move by rolling on the lower flange of the main girder of the bridge. It is necessary to install the rail in advance by moving the movable suspension jig on the lower flange of the main girder by repeatedly separating it and moving it to the work table near the pier and dismantling it. Without the problem of corrosion caused by rainwater, the suspension scaffold is separated into one unit and moved to a workbench near the pier with a movable lifting jig to dismantle, thereby reducing the work at height while overhanging. At the same time, it can be dismantled efficiently in a short time, and the need for traffic regulation can be greatly shortened.

  According to a fourth aspect of the present invention, in addition to the structure described in the third aspect, the suspension scaffold dismantling method is moved from the fixed suspension jig in which the suspension scaffold is fixedly installed to the movable suspension jig. However, it is characterized by dismantling.

  According to this method of dismantling the suspension scaffold, the suspension scaffold is moved from the fixed suspension jig in which the suspension scaffold is fixedly installed to the movable suspension jig, and is disassembled. By changing from a tool to a mobile suspension jig, the required number of mobile suspension jigs can be greatly reduced, and the cost of dismantling the suspension scaffold is reduced.

  Further, according to a fifth aspect of the present invention, there is provided a movable suspension jig comprising: a jig main body having a roller movable on the lower flange of the main girder of the bridge; It is characterized by comprising a pipe fixing bracket that is provided so as to support and fix the cage pipe.

  According to this movable suspension jig, a jig body provided with a roller that can move by rolling on the lower flange of the main girder of the bridge, and a canopy pipe that can be connected to the lower part of the jig body. It is made up of a pipe fixing bracket that supports and secures, and the suspension pipe of the suspension scaffold is supported by the pipe fixing jig and connected to the jig main body, and the roller of the jig main body is placed on the lower flange of the main girder Can be used to move the suspension scaffold after assembly and before dismantling, and there is no problem of corrosion due to rain water without the need to attach rails in advance, and a suspension scaffold for one unit can be assembled on the work bench near the pier. By disassembling, it is possible to reduce the work in high places while overhanging, to efficiently assemble and disassemble in a short time, and to greatly reduce the need for traffic regulation.

  According to a sixth aspect of the present invention, in addition to the structure according to the fifth aspect, a lifting prevention roller that rolls along the lower flange lower surface of the main girder is provided on the jig main body. It is characterized by providing.

  According to this movable hanging jig, the jig body is provided with a lifting prevention roller that rolls along the lower surface of the lower flange of the main girder to prevent the lifting during movement. It can be moved reliably.

  Furthermore, the movable suspension jig according to claim 7 of the present invention is characterized in that, in addition to the structure according to claim 5 or 6, the surface of the roller and / or the anti-lifting roller is made of hard rubber. It is what.

  According to this movable hanging jig, the surface of the roller and / or the anti-lifting roller is made of hard rubber, and these rollers damage the upper surface of the lower flange and the lower surface of the lower flange. To be able to move without having to.

  According to the method for assembling the suspension scaffold according to claim 1 of the present invention, the chair is placed on the work table near the pier via the movable suspension jig that can move by rolling on the lower flange of the main girder of the bridge. After suspending the pipe and assembling the suspension scaffold for one unit, moving to the other pier side and installing it, and repeating the assembly of the next one unit suspension scaffold on the workbench By moving the movable lifting jig on the lower flange of the main girder, there is no need to attach a rail in advance, and there is no problem of corrosion due to rainwater, and a suspension scaffold for one unit is assembled on the work bench near the pier. By moving with the movable lifting jig, it is possible to reduce the work at a high place while overhanging, to assemble efficiently in a short time, and to greatly reduce the need for traffic regulation.

  Moreover, according to the assembly method of the suspension scaffold according to claim 2 of the present invention, after moving with the movable suspension jig, the suspension scaffold is installed by replacing the fixed suspension jig. By changing to a fixed suspension jig such as a chain, the required number of mobile suspension jigs can be greatly reduced, and the installation cost of the suspension scaffold can be reduced.

  Furthermore, according to the method for disassembling the suspension scaffold according to claim 3 of the present invention, the cage pipe is suspended through a movable suspension jig that can move by rolling on the lower flange of the bridge main girder. Since the assembled suspension scaffold is separated into units and moved to a workbench near the pier and disassembled repeatedly, the movable suspension jig is moved on the lower flange of the main girder. Therefore, there is no need to attach rails in advance, and there is no problem of corrosion due to rainwater. The suspension scaffold can be separated into one unit and moved to a workbench near the pier with a mobile lifting jig and disassembled. It is possible to reduce the work at a high place while overhanging, to efficiently dismantle in a short time, and to greatly reduce the necessity of traffic regulation.

  According to the method for disassembling the suspension scaffold according to claim 4 of the present invention, the suspension scaffold is moved from the fixed suspension jig in which the suspension scaffold is fixedly installed to the movable suspension jig to be disassembled. Therefore, by changing from a fixed suspension jig such as a chain to a movable suspension jig, the required number of movable suspension jigs can be greatly reduced, and the cost of dismantling the suspension scaffold can be reduced. it can.

  Furthermore, according to the movable suspension jig according to claim 5 of the present invention, a jig main body provided with a roller which is movable by rolling on a lower flange of the main girder of the bridge, and a lower part of the jig main body Since it is made up of a pipe fixing bracket that can be connected to and fixed to the pipe, it supports the suspension scaffolding with the pipe fixing jig and connects it to the jig body. By moving the roller on the lower flange of the main girder, it is possible to move the suspension scaffold after assembly and before dismantling, and there is no need to attach a rail in advance, so there is no problem of corrosion due to rainwater, and work near the pier By assembling or dismantling the suspension scaffold for one unit on the table, it is possible to reduce the work at height while overhanging, and it is possible to assemble and dismantle efficiently in a short time, greatly increasing the need for traffic regulation. Shorten to Door can be.

  According to the movable suspension jig of claim 6 of the present invention, the jig main body is provided with a lifting prevention roller that rolls along the lower surface of the lower flange of the main girder. Can be prevented, and can move reliably.

  Further, according to the movable suspension jig of the seventh aspect of the present invention, since the surface of the roller and / or the anti-lifting roller is made of hard rubber, the upper surface of the lower flange is formed by these rollers. It is possible to move while preventing damage to the paint on the lower surface of the lower flange.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIGS. 1 to 3 relate to an embodiment of a method for assembling and disassembling a suspension scaffold according to the present invention and a mobile suspension jig used therefor, and FIG. 1 (a) is a front view of a suspension scaffold for one unit. , (B) is a cross-sectional view of the box girder, (c) is a cross-sectional view of the girder, FIG. 2 is an exploded perspective view of the movable lifting jig, and FIG. FIG.

  In the method for assembling and disassembling a suspension scaffold according to the present invention, as shown in FIGS. 1 and 2, a movable suspension jig 20 is used, and for example, a roller 22 is placed on the upper part of a jig body 21 made of a hollow square pipe. The roller 22 is configured to roll and move on the upper surface of the lower flange 1a of the main girder 1 of the bridge, for example, the box girder 1b or the girder 1c.

  In the movable hanging jig 20, a lifting prevention roller 23 is attached below the roller 22 of the jig body 21 to prevent the lifting by contacting the lower surface of the lower flange 1 a.

  These running rollers 22 and lift prevention rollers 23 are made of hard rubber 24 so that they do not damage the painted surface even if they roll in contact with the upper and lower surfaces of the painted lower flange 1a. For example, it is rotatably mounted on a fixed shaft attached to the jig body 21 via a bearing.

  The lower part of the jig body 21 is formed with a connecting portion 21a formed by crushing a square pipe to form a bolt hole 25. On both sides of the connecting portion 21a of the jig body 21, pipe fixing metal fittings 26 are provided. Are connected.

  The pipe fixing bracket 26 is formed with a pipe attachment hole 27 for attaching the cat pipe 4 for the suspension scaffold, and a bolt hole 28 is formed at the upper part, and the bolt hole 25 at the lower part of the jig body 21 is formed. These bolt holes 28 are connected by inserting bolts 29.

  According to such a movable hanging jig 20, the roller 22 can roll and move on the lower flange 1 a of the main girder 1 without requiring a special rail or the like, and the rail is welded in advance. In addition to reducing the number of man-hours required, the rails are not attached, so rainwater does not accumulate and does not cause corrosion.

  Further, since the surfaces of the running roller 22 and the lifting prevention roller 23 are made of hard rubber 24, the coated surface is not damaged even if it rolls in contact with the upper and lower surfaces of the painted lower flange 1a. There is no need for repair after use.

  The lifting prevention roller is mainly for preventing the lifting of the movable hanging jig when moving, and may be omitted depending on the direction in which the force is applied when moving.

Next, a method for assembling a suspension scaffold using such a movable suspension jig 20 will be described.
A work table 30 is temporarily installed in the vicinity of one of the piers 9 and 9 that support the main girder 1, and a suspension scaffold 40 for one unit is assembled on the work table 30.

  That is, as shown in FIG. 1, both sides of the lower flange 1a of the main girder 1 are opposed to each other by a coupling member 41, and a plurality of (three in the illustrated example) movable types are provided along the main girder 1. The suspension jig 20 is disposed, and the jog pipe 4 is attached and fixed to the pipe attachment hole 27 of the pipe fixing metal fitting 26 connected to the jig main body 21 by the bolt 29, and the jog pipes 4, 4 are arranged in the length direction. For example, one unit having a length of about 6 m and a width of the main beam 1, for example, a size of about 5 to 6 m is connected. In the longitudinal direction of the main beam 1, the movable suspension jigs 20 are connected by a connecting member 41 as necessary.

  Then, after rolling the roller 5 in the width direction of the bridge so as to be orthogonal to the baby pipe 4, the scaffold plate 6 is placed on the roller 5.

  Further, although not shown in the drawings, handrails are installed outside the scaffolding plates 6 at both ends, and a net is attached below the scaffolding plates 6 to complete the assembly of the suspension scaffolding 40 for one unit.

  As shown in FIG. 3, the suspended scaffolding 40 for one unit assembled in this way is moved by rolling the roller 22 toward the other bridge pier 9 side, and then fixed to a predetermined position by a roller stopper (not shown). Install in.

  As shown in FIG. 3 (a), the suspension scaffold 40 for one unit can be sequentially pushed out from the work platform 30 side, pulled by the rope 31 or the like from the opposite pier 9 side, A set of sheaves 32 is provided between the piers 9 and 9 and a loop-shaped rope 33 is installed and connected to and pulled. In addition, a driving device (not shown) is incorporated in the roller 12 itself to be self-propelled. Any method may be used.

  After the movement of the suspension scaffold 40 for one unit is started or after the movement and installation is completed, the suspension scaffold 40 for the next one unit is assembled on the work table 30.

  By repeating the assembly and movement on the work table 30, the suspension scaffolds 40, 40 of the necessary number of units are connected to complete the entire suspension scaffold.

  In addition, after moving the suspension scaffold 40 for one unit, like the conventional suspension scaffold 2 shown in FIG. 4, the baby pipe 4 is supported by a fixed suspension jig such as the suspension bracket 2 and the chain 3. After the load is temporarily supported by a lever winch or the like (not shown), the movable suspension jig 20 is removed and the load is supported by the fixed suspension jig. In this case, by forming a hole for chain locking in the pipe fixing metal fitting 26, the pipe fixing metal fitting 26 can be used as it is and can be supported by a fixed lifting jig.

  In this way, the necessary number of mobile lifting jigs 20 need only be prepared for 2 to 3 units, the necessary number can be greatly reduced, and the cost for installing the entire suspension scaffold can be reduced. Can do.

  Next, when disassembling the suspension scaffold, contrary to the assembly, the suspension scaffold 40 for one unit is separated from the entire scaffold, and this is moved onto the work table 30 via the movable suspension jig 20. And then repeat the dismantling.

  In addition, when the assembly is replaced with a fixed suspension jig, the load is supported by a lever winch and the like, and then the fixed suspension jig is removed to transfer the load to the movable suspension jig 20. After the load has been transferred, it may be repeated by moving the mobile suspension jig 20 one unit at a time in the same manner.

  As specifically described above, according to the method for assembling the suspension scaffold, the movable suspension jig 20 is moved on the lower flange 1a of the main girder 1 so that it is not necessary to attach a rail in advance. There is no problem of corrosion due to the above. By assembling the suspension scaffold 40 for one unit on the work table 30 in the vicinity of the pier 9 and moving it with the movable suspension jig 20, it is possible to reduce the work at high places while projecting. At the same time, it can be assembled efficiently in a short time, and the need for traffic regulation can be greatly reduced.

  In addition, according to the method of assembling the suspension scaffold, the necessary number of the movable suspension jigs 20 can be significantly reduced by changing to a fixed suspension jig such as a chain. Reduction can be achieved.

  Furthermore, according to the method for dismantling the suspension scaffold, the movable suspension jig 20 is moved on the lower flange 1a of the main girder 1 so that it is not necessary to attach a rail in advance and there is no problem of corrosion due to rainwater. The scaffold can be separated into one unit and moved to the work table 309 near the pier 9 with the movable suspension jig 20 to be disassembled, so that the work at high places while overhanging can be reduced and the time can be reduced. Can be dismantled efficiently, and the need for traffic regulation can be greatly reduced.

  In addition, according to this method of dismantling the suspension scaffold, the necessary number of the movable suspension jigs 20 can be greatly reduced by changing from a stationary suspension jig such as a chain to the movable suspension jig 20. The cost for dismantling the suspension scaffold can be reduced.

It relates to an embodiment of a method for assembling and disassembling a suspension scaffold according to the present invention and a mobile suspension jig used therefor, (a) is a front view of a suspension scaffold for one unit, and (b) is installed in a box girder. (C) is a cross-sectional view in a state where it is installed on a girder. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a mobile suspension jig according to an embodiment of a suspension scaffold assembly method, a disassembly method, and a mobile suspension jig used therefor according to the present invention. It is explanatory drawing of the assembly process concerning one Embodiment of the assembly method of the suspension scaffold of this invention, a disassembly method, and the movable suspension jig used for these. It is a cross-sectional view of a conventional suspension scaffold. It is explanatory drawing of the conventional mobile protective work of a bridge.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main girder 1a Lower flange 1b Box girder 1c Girder 2 Suspension bracket 3 Chain 4 Oya pipe 5 Rolling 6 Scaffold plate 7 Handrail 8 Net 9 Bridge pier 20 Mobile suspension jig 21 Jig body 21a Connecting part 22 Roller (for traveling)
23 Lifting prevention roller 24 Hard rubber 25 Bolt hole (Jig body)
26 Pipe fixing bracket 27 Pipe mounting hole 28 Bolt hole (pipe fixing bracket)
29 Bolt 30 Worktable 31 Rope 32 Sheave 33 Rope (Loop)
40 Suspended scaffold 41 Connecting member

Claims (7)

After assembling a suspension scaffold for one unit by hanging a wooden pipe on a work table near the pier via a movable lifting jig that can move by rolling on the lower flange of the main girder of the bridge, A method of assembling a suspension scaffold, wherein the assembly is performed by moving to the pier side and repeatedly assembling a suspension scaffold for the next one unit on the work table. 2. The method of assembling a suspension scaffold according to claim 1, wherein the suspension scaffold is installed after being moved by the movable suspension jig and replaced with a fixed suspension jig. Work in the vicinity of the pier by separating the suspension scaffolds that are assembled by suspending the cage pipes through a movable suspension jig that can be moved by rolling on the lower flange of the main girder of the bridge. A method for dismantling a suspended scaffold, characterized by repeating the dismantling by moving to a table. 4. The method for disassembling a suspension scaffold according to claim 3, wherein the suspension scaffold is moved from the fixed suspension jig in which the suspension scaffold is fixedly installed to the movable suspension jig to be disassembled. It consists of a jig body with an upper roller that can move by rolling on the lower flange of the main girder of the bridge, and a pipe fixing bracket that can be connected to the lower part of the jig body to support and fix the jog pipe. A mobile hanging jig characterized by that. 6. The movable suspension jig according to claim 5, wherein a lifting prevention roller that rolls along the lower surface of the lower flange of the main girder is provided in the jig main body. The movable suspension jig according to claim 5 or 6, wherein a surface of the roller and / or the anti-lifting roller is made of hard rubber.

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