Box girder internal scaffold and installation method for box girder internal scaffold

Abstract

To provide a box girder internal scaffold that allows easy installation of scaffolding inside box girders.SOLUTION: A box girder internal scaffold 10 installed inside of box girders 3 of a box girder bridge 1 is provided with a work floor part 20 on which workers work, and a support part 30 supporting the work floor part 20, wherein at least a part of members constituting the work floor part 20 and members constituting the support part 30 is made of fiber-reinforced plastic.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a box girder internal scaffolding to be installed inside the box girder of a box girder bridge and a method for installing the box girder internal scaffolding. [Background technology]

[0002] 2. Description of the Related Art Box girder bridges, in which girders constituting a bridge such as an elevated bridge are formed in a box shape, are known in the art (see, for example, Patent Document 1).

[0003] For box girder bridges, workers who carry out inspections enter the inside of the box girders and perform inspections on the underside of the deck and other structures to detect deterioration of the structure through magnetic particle testing and inspections using a semi-automated ultrasonic tester (SAUT), and also perform repair work to repair the structure.

[0004] When working inside a box girder, if the height from the floor to the ceiling inside the box girder is such that workers on the floor cannot reach the ceiling directly, scaffolding will first be set up inside the box girder and then the workers will perform their work on the scaffolding.

[0005] Conventionally, when scaffolding is installed inside a box girder, scaffolding materials are transported inside the box girder and assembled each time a worker performs work inside the box girder, and after the work is completed, the assembled scaffolding is dismantled and the scaffolding materials are transported out from inside the box girder. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2010-37802 A Summary of the Invention [Problem to be solved by the invention]

[0007] The scaffolding materials used inside the box girders are mainly made of steel and are therefore heavy, and the work of transporting the scaffolding materials inside the box girders requires a lot of labor, making it difficult to improve work efficiency.

[0008] An object of the present invention is to provide a box girder internal scaffolding and a method for installing a box girder internal scaffolding that allows scaffolding to be easily installed inside a box girder. [Means for solving the problem]

[0009] The box girder internal scaffolding of the present invention is a box girder internal scaffolding installed inside the box girder of a box girder bridge, and comprises a work floor section where workers perform work, and a support section that supports the work floor section, and at least a portion of the members that constitute the work floor section and the members that constitute the support section are made of fiber-reinforced plastic.

[0010] In addition, it is preferable that the box girder internal scaffolding of the present invention has the working floor portion consisting of a plurality of scaffolding boards.

[0011] In addition, it is preferable that the box girder internal scaffolding of the present invention has a plurality of openings formed over the entire surface and extending in the thickness direction.

[0012] In addition, it is preferable that the support portion of the box girder internal scaffolding of the present invention has a plurality of hanging members suspended from the upper surface side of the inside of the box girder, and a beam member fixed to the lower end side of the hanging members and supporting the work floor portion from below.

[0013] In addition, the method of installing a box girder internal scaffolding of the present invention is a method of installing a box girder internal scaffolding inside a box girder, and includes a scaffolding material delivery process of transporting members constituting the working floor section and members constituting the support section through a communication section formed in the box girder, and a scaffolding assembly process of assembling the members constituting the working floor section and the members constituting the support section that have been transported inside the box girder in the scaffolding material delivery process inside the box girder. Effect of the Invention

[0014] According to the present invention, it is possible to reduce the weight of the members constituting the working floor and the members constituting the support part, thereby making it possible to easily transport the members constituting the working floor and the members constituting the support part into the inside of the box girder, and thereby improving the work efficiency of installing scaffolding inside the box girder. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a side view of a box girder bridge according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side view of a box girder internal scaffolding according to one embodiment of the present invention. [Diagram 3] 3 is a view taken along the line AA in FIG. 2 according to one embodiment of the present invention. [Figure 4] 4 is a view taken along the arrow BB in FIG. 3 according to one embodiment of the present invention. [Diagram 5] 4 is a view taken along the CC arrow in FIG. 3 according to one embodiment of the present invention. [Figure 6] FIG. 2 is a side view of a main portion of a box girder internal scaffolding according to one embodiment of the present invention. [Figure 7] FIG. 2 is a front view of a main portion of a box girder internal scaffolding according to one embodiment of the present invention. [Figure 8] FIG. 2 is a perspective view of a floor member according to one embodiment of the present invention. [Figure 9] 1 is a cross-sectional view of a floor member according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Figures 1 to 9 show one embodiment of the present invention. Figure 1 is a side view of a box girder bridge, Figure 2 is a side view of the box girder internal scaffolding, Figure 3 is a view taken along the line AA in Figure 2, Figure 4 is a view taken along the line BB in Figure 3, Figure 5 is a view taken along the line CC in Figure 3, Figure 6 is a side view of the main parts of the box girder internal scaffolding, Figure 7 is a front view of the main parts of the box girder internal scaffolding, Figure 8 is a perspective view of a floor member, and Figure 9 is a cross-sectional view of the floor member.

[0017] The box girder internal scaffolding of the present invention is applied to, for example, a box girder bridge 1 used as an elevated bridge of a highway, as shown in FIG.

[0018] The box girder bridge 1 has a number of piers 2 arranged at intervals in the direction in which the road extends, and box girders 3, for example made of steel, that are spanned between adjacent piers 2.

[0019] As shown in Figs. 2 and 3, the box girder 3 has a plurality of diaphragms 3a arranged at intervals of, for example, 6 m in the bridge axis direction and extending in a direction perpendicular to the bridge axis. In addition, between the diaphragms 3a adjacent to each other in the bridge axis direction, a transverse rib 3b extending in a direction perpendicular to the bridge axis is arranged. The diaphragms 3a and the transverse ribs 3b each extend, for example, 1.5 m upward from the floor surface inside the box girder 3. Furthermore, inside the box girder 3, a plurality of longitudinal ribs 3c are formed, which are arranged at intervals of, for example, 0.35 m in the direction perpendicular to the bridge axis and extend along the bridge axis. The plurality of longitudinal ribs 3c extend, for example, 0.2 m upward from the floor surface inside the box girder 3. In addition, on the side of the box girder 3, as shown in Fig. 5, a communication part 3d is formed which can be opened and closed by an opening and closing door and communicates between the inside and outside of the box girder 3. The communication portion 3d has a width of 0.6 m and a height of 0.8 m, for example.

[0020] The box girder internal scaffolding 10 is a permanent scaffolding used when inspecting or repairing structures on the upper side of the internal space, such as inspecting the deck located on the ceiling surface side inside the box girder 3. The box girder internal scaffolding 10 is installed approximately midway between the floor surface and the ceiling surface (e.g., 2.1 m from the floor surface) when the distance between the floor surface and the ceiling surface inside the box girder 3 is, for example, 3.8 m or more.

[0021] As shown in Figures 2 to 5, the box girder internal scaffolding 10 comprises a work floor section 20 on which workers perform work, a support section 30 that supports the work floor section 20, and a ladder 40 for the worker to climb up to the work floor section 20.

[0022] As shown in Figs. 8 and 9, the working floor section 20 is composed of a plurality of scaffolding boards 21. The scaffolding boards 21 are made of members made of fiber-reinforced plastic. The scaffolding boards 21 are made of plate-shaped members having a short side dimension of 500 mm, a long side dimension of 2300 mm, and a thickness dimension of 25 mm, and are formed to a size that allows them to be carried into the inside of the box girder 3 through the communication part 3d of the box girder 3. The scaffolding boards 21 are so-called gratings in which plate-shaped members are crossed in a lattice shape, and are formed with a plurality of openings 21a extending in the thickness direction over the entire surface. The openings 21a are formed in a rectangular shape having a short side dimension of 18 mm on the upper surface side and a long side dimension of 93 mm, and the intervals in the short side and long side directions gradually increase toward the lower surface side. The scaffolding boards 21 can be used by being notched or cut with a tool according to the internal structures of the box girder 3, such as the diaphragm 3a and the cross rib 3b.

[0023] As shown in Figures 6 and 7, the support section 30 has a plurality of hanging members 31 suspended from the upper surface side inside the box girder 3, and a beam member 32 fixed to the lower end side of the hanging members 31 and supporting the working floor section 20 from below.

[0024] Each of the multiple hanging members 31 is a fiber-reinforced plastic member formed in a U-shaped cross section with a groove formed along the extension direction. Each of the multiple hanging members 31 is formed in a size that allows it to be carried into the inside of the box girder 3 through the communication part 3d of the box girder 3. The upper end side of the hanging member 31 is fixed to the diaphragm 3a and the horizontal rib 3b inside the box girder 3 by a bracket, and the beam member 32 is fixed to the lower end side.

[0025] The beam member 32 has a plurality of horizontal beams 32a extending in a direction perpendicular to the bridge axis, and a plurality of vertical beams 32b extending along the bridge axis.

[0026] Each of the multiple cross beams 32a has an H-shaped cross section and is formed by connecting multiple long members made of fiber-reinforced plastic with a length of, for example, about 2 m, at the ends of which are fastened by fastening members such as steel bolts and nuts. Each of the multiple cross beams 32a is fixed to the lower end side of the hanging member 31 by fastening members. Each of the multiple cross beams 32a can be carried into the box girder 3 from the communication portion 3d of the box girder 3 as multiple long members before being assembled.

[0027] Each of the vertical beams 32b has an H-shaped cross section and is made of a plurality of long members made of fiber-reinforced plastic having a length of, for example, about 2 m. Each of the vertical beams 32b is placed on the upper surface of the horizontal beam 32a and fixed to the horizontal beam 32a by fastening members. Furthermore, the scaffolding board 21 constituting the working floor section 20 is placed on the upper surface of the vertical beam 32b and fixed to the scaffolding board 21 by fastening members. Each of the vertical beams 32b can be transported into the box girder 3 from the communication portion 3d of the box girder 3 in the state of a long member before being assembled.

[0028] 3 and 5, the ladder 40 is provided on the inner wall surface of the box girder 3. The ladder 40 has a ladder body 41 that a worker can grasp with his hands or place his feet on, and a fall prevention ring 42 that is provided on the ladder body 41 and formed so as to surround the outer periphery of the worker moving on the ladder body 41.

[0029] Next, a method of installing the box girder internal scaffolding 10 inside the box girder 3 will be described.

[0030] First, as part of the scaffolding material delivery process, the multiple scaffolding boards 21, the multiple hanging members 31, the long members constituting the multiple cross beams 32a and the multiple vertical beams 32b, the ladder body 41 and the anti-fall ring 42 are delivered into the inside of the box girder 3 through the connecting portion 3d of the box girder 3.

[0031] Next, as a scaffolding assembly process, the multiple scaffolding boards 21, the multiple hanging members 31, the long members constituting the multiple cross beams 32a and the multiple vertical beams 32b, the ladder body 41 and the fall prevention ring 42 that have been brought into the box girder 3 are respectively assembled, thereby installing the box girder internal scaffolding 10 inside the box girder 3.

[0032] In the box girder internal scaffolding 10 configured as described above, a worker performing inspection or repair work on the structure on the ceiling side inside the box girder 3 enters the inside of the box girder 3 through the communication part 3d, uses the ladder 40 to move to the work floor part 20, and performs the work.

[0033] At this time, since the multiple scaffolding boards 21 constituting the working floor section 20 have openings 21a formed over the entire surface, it is possible to pass wiring for power tools and floodlights used by workers for work, and there is no need for a power source on the ceiling side inside the box girder 3. In addition, since the light from lighting fixtures such as floodlights installed above the working floor section 20 can illuminate the area below the working floor section 20 through the openings 21a of the scaffolding boards 21, it is possible to reduce the number of lighting fixtures used.

[0034] Thus, according to the box girder internal scaffolding of this embodiment, the box girder internal scaffolding 10 is installed inside the box girder 3 of the box girder bridge 1, and comprises a work floor section 20 where workers perform work, and a support section 30 that supports the work floor section 20, and at least some of the members that make up the work floor section 20 and the support section 30 are made of fiber-reinforced plastic.

[0035] This allows the weight of the members constituting the working floor 20 and the members constituting the support 30 to be reduced, making it possible to easily carry the members constituting the working floor 20 and the members constituting the support 30 into the box girder, and improving the work efficiency of the work of installing scaffolding inside the box girder 3. In addition, since it is possible to reduce the weight of the members constituting the working floor 20 and the members constituting the support 30, it is possible to reduce the influence of the weight of the box girder internal scaffolding 10, which is a load on the box girder 3, and it is possible to extend the life of the box girder bridge 1. Furthermore, since members made of fiber-reinforced plastics can reduce the occurrence of deterioration such as corrosion compared to steel members, it is possible to reduce the costs of maintenance work, repair work, etc.

[0036] It is also preferable that the work floor section 20 consists of a plurality of scaffolding boards 21.

[0037] This makes it possible to easily transport the components that make up the working floor section 20 into the box girder 3 even if the size of the opening of the communicating section 3d is small, thereby making it possible to reduce the work efficiency of the transportation work.

[0038] It is also preferable that the scaffolding board 21 has a plurality of openings 21a formed over the entire surface and extending in the thickness direction.

[0039] This makes it possible to pass wiring for power tools and spotlights used by workers for work, and since there is no need for a power source on the ceiling side inside the box girder 3, it is possible to improve work efficiency during work.

[0040] It is also preferable that the support section 30 has a plurality of hanging members 31 suspended from the ceiling side inside the box girder 3, and a beam member 32 fixed to the lower end side of the hanging members 31 and supporting the work floor section 20 from below.

[0041] This makes it possible to form a work floor section extending on a horizontal plane even when a structure is formed on the floor side inside the box girder 3.

[0042] It is also preferable that the method of installing the box girder internal scaffolding 10, which installs the box girder internal scaffolding 10 inside the box girder 3, includes a scaffolding material delivery process in which the members constituting the work floor section 20 and the members constituting the support section 30 are delivered through a communication section 3d formed in the box girder 3, and a scaffolding assembly process in which the members constituting the work floor section 20 and the members constituting the support section 30 delivered inside the box girder 3 in the scaffolding material delivery process are assembled inside the box girder 3.

[0043] This allows the components constituting the working floor section 20 and the components constituting the support section 30, including the lightweight components, to be transported inside the box girder 3, making it possible to easily transport the components constituting the working floor section 20 and the components constituting the support section 30 into the inside of the box girder.

[0044] In the above embodiment, the fastening members such as bolts and nuts used to assemble the box girder internal scaffolding 10 are made of steel, but this is not limited to this, and all components of the box girder internal scaffolding, including the fastening members, may be formed from fiber-reinforced plastic.

[0045] In the above embodiment, the box girder internal scaffolding 10 is installed on the box girder bridge 1 as an elevated bridge of a highway, but the present invention is not limited to this and may be applied to a bridge that spans both banks of a river. Also, the present invention is not limited to an elevated bridge of a highway and may be applied to a bridge for a railway track.

[0046] In the above embodiment, the working floor section 20 is supported by the support section 30 suspended from the ceiling inside the box girder 3, but this is not limited to this. As long as the working floor section can be supported, the working floor section may be supported by a support section installed on the floor surface inside the box girder. [Explanation of symbols]

[0047] 1 box girder bridge 3d communication part 10 Box girder internal scaffolding 20 Working floor section 21 Scaffolding Plank 21a opening 30 Support part 31 Hanging members 32 Beam member 32a crossbeam 32b Longitudinal beam

Claims

1. A box girder internal scaffolding installed inside the box girder of a box girder bridge, A work floor section where a worker performs work; A support portion that supports the working floor portion, At least a part of the members constituting the work platform and the members constituting the support are made of fiber-reinforced plastic. Box girder interior scaffolding.

2. The working floor section is made up of a plurality of scaffolding boards. The box girder internal scaffolding according to claim 1.

3. The scaffolding board has a plurality of openings formed over the entire surface and extending in the thickness direction. The box girder internal scaffolding according to claim 2.

4. The support portion includes a plurality of hanging members suspended from the upper surface side inside the box girder, and a beam member fixed to the lower end side of the hanging members and supporting the work floor portion from below. The box girder internal scaffolding according to claim 1.

5. A method for installing a box girder internal scaffolding according to any one of claims 1 to 4 inside a box girder, A scaffolding material delivery process in which a member constituting the work floor section and a member constituting the support section are delivered through a communication section formed in the box girder; and a scaffolding assembly process for assembling the members constituting the work floor section and the members constituting the support section, which are carried into the box girder in the scaffolding material carrying-in process, inside the box girder. How to install box girder internal scaffolding.

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