Permanent scaffolding for bridges

Abstract

To provide a permanent scaffold for a bridge capable of sufficiently securing the strength of a rear surface panel and forming the rear surface panel having high corrosion resistance or rust resistance at a low cost.SOLUTION: A rear surface panel 30 has an exterior member 31 forming both side surfaces and the lower surface of the rear surface panel 30 and a reinforcing member 32 arranged in the rear surface panel 30, since the exterior member 31 exposed to the outside is formed of a member having higher corrosion resistance or rust resistance than a top plate 31a, an end plate 31b, and the reinforcing member 32, the rear panel 30 having high corrosion resistance or rust resistance can be formed at a low cost while sufficiently securing the strength of the rear panel 30 by forming the top plate 31a, the end plate 31b, and the reinforcing member 32 not exposed to the outside with a member having lower corrosion resistance or rust resistance than the exterior member 31.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a permanent scaffold for bridges that is permanently installed under bridges for inspecting bridges and the like.

Background Art

[0002] Conventionally, in the maintenance and inspection of bridges such as road bridges and railway bridges, inspections have often been carried out only by visual inspection from an inspection path attached to the lower surface of the bridge. In addition, when inspecting the entire bridge in close proximity, a high-altitude work vehicle or a bridge inspection vehicle has been used, or a temporary scaffold for construction has been installed. However, when using a high-altitude work vehicle or a bridge inspection vehicle, traffic control is required because it occupies the working road surface. In addition, when the area under the bridge is a place where vehicles cannot enter, such as a railway line or a river, inspection by a high-altitude work vehicle or a bridge inspection vehicle cannot be carried out. Furthermore, when inspecting by installing a temporary scaffold for construction, there is a problem that the installation and removal costs of the temporary scaffold are separately required, and the bridge inspection cost becomes high.

[0003] Therefore, there is known a structure in which a permanent scaffold is permanently installed under a bridge so that inspection work close to the bridge can be carried out at all times (see, for example, Patent Document 1). This permanent scaffold is configured by arranging a plurality of longitudinal beams extending in the bridge axis direction under the bridge at intervals in the direction perpendicular to the bridge axis, arranging a plurality of back panels for workers to stand on between the longitudinal beams in the bridge axis direction, and providing side panels on both sides in the direction perpendicular to the bridge axis of the back panels.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the conventional permanent scaffolding described above uses steel (for example, highly corrosion-resistant plated steel sheets) for the back panel to ensure its strength. However, permanent scaffolding installed permanently is prone to corrosion and rust on the exposed steel parts, resulting in poor long-term durability. Furthermore, while using aluminum or stainless steel instead of steel can improve the corrosion resistance or rust resistance of the back panel, aluminum and stainless steel are more expensive than steel, leading to higher material costs.

[0006] The present invention has been made in view of the above-mentioned problems, and its objective is to provide a permanent scaffolding for bridges that can sufficiently ensure the strength of the back panel and can form a back panel with high corrosion resistance or rust resistance at low cost. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a permanent scaffolding for a bridge, comprising a plurality of back panels for workers to stand on, arranged in the direction of the bridge axis below the bridge, with side panels provided on both sides of the back panels perpendicular to the bridge axis, wherein the back panels are ,back Surface panel Both sides and Exterior member forming the lower surface, The top panel that forms the top surface of the rear panel, The exterior member has a reinforcing member positioned within the back panel, and the exterior member is Tabletop and It is formed from a material with higher corrosion resistance or rust resistance than the reinforcing material.

[0008] As a result, since the exterior members exposed to the outside are formed from materials with higher corrosion resistance or rust resistance than the reinforcing members, it is possible to form the reinforcing members that are not exposed to the outside from materials with lower corrosion resistance or rust resistance and lower cost than the exterior members, thereby ensuring sufficient strength of the back panel while forming a back panel with high corrosion resistance or rust resistance. [Effects of the Invention]

[0009] According to the present invention, while sufficiently ensuring the strength of the back panel, a back panel with high corrosion resistance or rust resistance can be formed at low cost. Therefore, the durability of the back panel in long-term use can be enhanced, and the material cost and construction cost of the entire permanent scaffold can be reduced.

Brief Description of the Drawings

[0010] [Figure 1] Front view of a permanent scaffold for a bridge showing an embodiment of the present invention [Figure 2] Side view of the permanent scaffold [Figure 3] Front view of the main part of the permanent scaffold [Figure 4] Partial front view of the back panel [Figure 5] Partial exploded front view of the exterior member [Figure 6] Partial exploded front view of the back panel [Figure 7] Side cross-sectional view of the back panel [Figure 8] Exploded side cross-sectional view of the back panel [Figure 9] Front view of the main part showing the fixed state of the back panel [Figure 10] Plan view of the main part showing the connected state of the back panel [Figure 11] Partial exploded perspective view showing the installation process of the back panel [Figure 12] Partial exploded perspective view showing the attachment process of the connecting plate [Figure 13] Partial exploded perspective view showing the connected state of the back panel [Figure 14] Perspective view of the main part showing the connected state of the back panel [Figure 15] Exploded side view of the side panel [Figure 16] Partial rear-side perspective view of the side panel [Figure 17] Perspective view of the panel member [Figure 18] Perspective view of the panel unit [Figure 19] Partial rear-side perspective view of the side panel showing an embodiment of the present invention [Figure 20]Perspective view of the panel member [Figure 21] Side sectional view of the panel member

Mode for Carrying Out the Invention

[0011] Figures 1 to 18 show an embodiment of the present invention, and show a permanent scaffold for a bridge that is permanently installed under the bridge for inspecting the bridge and the like.

[0012] The bridge 1 shown in the figure is one in which a floor slab 3 is installed on a plurality of main girders 2, and each main girder 2 is installed on a pier 4.

[0013] The permanent scaffold 10 of the present embodiment includes a plurality of longitudinal beams 20 extending in the bridge axis direction, a plurality of back panels 30 provided between the longitudinal beams 20, and side panels 40 provided on both sides in the direction perpendicular to the bridge axis of the back panel 30, and each back panel 30 is supported by each longitudinal beam 20.

[0014] The longitudinal beams 20 are arranged at intervals in the direction perpendicular to the bridge axis. The longitudinal beams 20 arranged at both ends in the direction perpendicular to the bridge axis are made of channel steel, and the longitudinal beams 20 arranged on the central side in the direction perpendicular to the bridge axis are made of H-shaped steel. The longitudinal beam 20 has an upper flange 20b and a lower flange 20c at the upper end and the lower end of the web 20a, respectively, and the end of the back panel 30 is placed on the lower flange 20c. The longitudinal beams 20 arranged at both ends in the direction perpendicular to the bridge axis are fixed to the lower ends of columns 21 extending in the vertical direction, and the columns 21 are fixed to the web of the main girder 2 by a truss composed of a pair of horizontal members 22 and diagonal members 22a extending in the horizontal direction. The longitudinal beams 20 arranged on the central side in the direction perpendicular to the bridge axis are fixed to the lower ends of columns 23 extending in the vertical direction, and the columns 23 are fixed to the web of the main girder 2 by a support member 24 extending in the horizontal direction.

[0015] The back panel 30 consists of an exterior member 31 formed in a U-shape in cross-section to form the bottom and both sides of the back panel 30, a top plate 31a forming the top surface of the back panel 30, a pair of end plates 31b with a roughly U-shape in cross-section that cover both longitudinal ends of the exterior member 31, and a corrugated reinforcing member 32 placed inside the exterior member 31. The exterior member 31 is made of a material (e.g., aluminum plate) that has higher corrosion resistance or rust resistance than the material of the top plate 31a, end plates 31b, and reinforcing member 32 (e.g., highly corrosion-resistant plated steel plate). In addition, screw holes 31c for screwing in the connecting plate 34, which will be described later, are provided at multiple locations along the longitudinal direction of the top plate 31a on both sides in the width direction of the top plate 31a.

[0016] The reinforcing member 32 is formed by continuously creating multiple U-shaped bent portions 32a in the width direction, which are alternately bent in the vertical direction, and the height dimension of each bent portion 32a is formed to be equal to the internal height dimension of the exterior member 31.

[0017] Specifically, the back panel 30 is assembled by placing a reinforcing member 32 inside the exterior member 31, placing a top plate 31a above the reinforcing member 32, fixing the top surface and both sides of the reinforcing member 32 to the top plate 31a, and the bottom surface of the reinforcing member 32 to the exterior member 31 with bolts, and then covering both longitudinal ends of the exterior member 31 with end plates 31b, and fixing the upper surfaces of each end plate 31b to the top plate 31b with bolts.

[0018] Furthermore, the back panel 30 is fixed to each vertical beam 20 by a fixing plate 33. At that time, as shown in Figure 9, the ends of the back panel 30 are placed on the lower flange 20c of the vertical beam 20 via a packing 31d (for example, a rubber sheet). The fixing plate 33 consists of an upper fixing piece 33a fixed to the upper surface of the upper flange 20b of the vertical beam 20, a lower fixing piece 33b fixed to the upper surface of the back panel 30, and an intermediate piece 33c formed between the upper fixing piece 33a and the lower fixing piece 33b, the intermediate piece 33c being formed to extend diagonally downward from the upper flange 20b side toward the upper surface side of the back panel 30. As shown in Figure 13, the back panel 30 is arranged in the bridge axis direction between each vertical beam 20, and both longitudinal ends are placed on the lower flange 20c and fixed to the vertical beam 20 by the fixing plate 33. In this configuration, the upper fixing piece 33a of the fixing plate 33 is fixed to the upper flange 20b of the vertical beam 20 by bolts 33d, and the lower fixing piece 33b of the fixing plate 33 is fixed to the top plate 31b of the back panel 30 by bolts 33d. Furthermore, since the intermediate piece 33c of the fixing plate 33 is formed at an angle perpendicular to the bridge axis, deformation of the intermediate piece 33c does not easily occur in response to forces perpendicular to the bridge axis, compared to the case where the intermediate piece 33c is formed vertically.

[0019] Furthermore, the back panels 30, which are fixed to the vertical beams 20 by the fixing plates 33, are connected to adjacent back panels 30 by connecting plates 34. The connecting plates 34 extend in the longitudinal direction (perpendicular to the bridge axis) of the back panels 30 and are formed to be slightly shorter than the longitudinal length of the back panels 30. The connecting plates 34 are provided with elongated holes 34a and 34b through which screws 35, which serve as fastening members that are screwed into the screw holes 31c of the back panels 30, are inserted. The elongated hole 34a located on one side of the adjacent back panel 30 is elongated in the longitudinal direction (perpendicular to the bridge axis) of the back panel 30, while the elongated hole 34b located on the other side of the back panel 30 is elongated in the width direction (bridge axis direction) of the back panel 30. Specifically, as shown in Figure 14, the connecting plate 34 is placed on the upper surface of adjacent back panels 30 via a packing 34c (for example, a rubber sheet), and fastened to the back panels 30 by screwing screws 35, which pass through each of the elongated holes 34a and 34b, into the screw holes 31c of the back panels 30, thereby connecting the back panels 30 together. At this time, since the longitudinal directions of each of the elongated holes 34a and 34b are oriented perpendicular to the bridge axis and in the direction of the bridge axis, misalignment of the back panels 30 in the direction perpendicular to the bridge axis and in the direction of the bridge axis is absorbed.

[0020] Furthermore, the longitudinal ends of adjacent back panels 30 are connected by an L-shaped end connecting plate 36 that covers the back panel 30 from the top surface to the end surface, as shown in Figures 13 and 14. The end connecting plate 36 has a packing 36a (for example, a rubber sheet) on its inner surface and is fixed to each back panel 30 by bolts 37.

[0021] The side panel 40 is formed by arranging a plurality of panel members 41 extending in the bridge axis direction in the vertical direction. The panel members 41 are made of a material (e.g., aluminum plate) that has higher corrosion resistance or rust resistance than the material (e.g., high corrosion-resistant plated steel sheet) of the top plate 31a, end plate 31b, and reinforcing member 32 of the back panel 30. The panel members 41 are formed by a member bent into a trapezoidal cross-section consisting of an upper surface portion 41a, a lower surface portion 41b, and a front surface portion 41c. The back side is open, and the front surface portion 41c is formed to slope downwards towards the front.

[0022] Furthermore, the side panel 40 is formed by arranging a plurality of panel units 42, each consisting of a predetermined number of panel members 41, in a vertical direction. In this embodiment, the side panel 40 is constructed by using one panel unit 42 consisting of two panel members 41, one panel unit 42 consisting of three panel members 41, and two panel units 42 consisting of four panel members 41, and arranging these in order from top to bottom. In addition, a panel member 42a with a vertical front surface is provided on the upper part of the uppermost panel unit 42.

[0023] The panel unit 42 has a back plate 43 that covers the entire back surface of each panel member 41, and the back surfaces of multiple panel members 41 stacked vertically are fixed to the back plate 43. In this case, the sides of each panel member 41 are covered by side plates 44, and the side plates 44 are made of a material (for example, an aluminum plate) that has the same high corrosion resistance or rust resistance as the panel members 41. The back plate 43 is provided with L-shaped mounting members 45 for attachment to furring strips 47, which will be described later, and the mounting members 45 are attached to the upper and lower ends of the back plate 43. The back plate 43 is also provided with gripping parts 46 for gripping with the fingers, and although not shown, the gripping parts 46 are provided at multiple locations in the width direction of the back plate 43.

[0024] Each panel unit 42 is attached to furring strips 47 provided at multiple locations in the vertical direction of the support column 21. That is, the panel unit 42 is fixed to the support column 21 by fixing each mounting member 45 of the panel unit 42 to the furring strips 47 with bolts or the like (not shown). At that time, the gripping portion 46 of the panel unit 42 can be grasped to perform the installation work.

[0025] The permanent scaffolding 10, configured as described above, is permanently installed below the bridge 1, allowing inspection work on the bridge 1 to be performed on the back panel 30. In this case, the lower surface of the exterior member 31 of the back panel 30 and the panel member 41 of the side panel 40 are exposed to the outside, but since the exterior member 31 of the back panel 30 and the panel member 41 are made of materials with high corrosion resistance or rust resistance, corrosion and rust do not occur as easily as with steel. The support columns 21, 23, support members 22, 24 and furring strips 47 are made of materials with lower corrosion resistance or rust resistance than the exterior member 31 and the panel member 41 (for example, highly corrosion-resistant plated steel sheets).

[0026] As described above, in the permanent scaffolding for bridges of this embodiment, the back panel 30 has exterior members 31 that form both sides and the bottom surface of the back panel 30, and reinforcing members 32 that are arranged inside the back panel 30. Since the exterior members 31 that are exposed to the outside are made of a material with higher corrosion resistance or rust resistance than the top plate 31a, end plate 31b and reinforcing members 32, the top plate 31a, end plate 31b and reinforcing members 32 that are not exposed to the outside can be made of a material with lower corrosion resistance or rust resistance and lower cost than the exterior members 31. As a result, a back panel 30 with high corrosion resistance or rust resistance can be made at a low cost while ensuring sufficient strength of the back panel 30, thereby increasing the durability of the back panel 30 in long-term use and reducing the material cost and construction cost of the entire permanent scaffolding.

[0027] In this case, since the reinforcing member 32 is formed in a corrugated shape, the reinforcing member 32 can be made into a shape with high strength but a thin plate thickness, and the weight of the reinforcing member 32 can be reduced.

[0028] Furthermore, the vertical beams 20 that support both ends of the back panel 30 in the direction perpendicular to the bridge axis are made of members having an upper flange 20b and a lower flange 20c, with the end of the back panel 30 resting on the upper 20c of the lower flange, and the upper surface of the end of the back panel 30 and the upper flange 20b being fixed by a fixing plate 33. The fixing plate 33 is formed to extend diagonally downward from the upper flange 20b side toward the upper surface side of the back panel 30, so compared to the case where the fixing plate 33 is formed to extend vertically, deformation due to forces in the direction perpendicular to the bridge axis does not easily occur, and the support strength of the back panel 30 by the vertical beams 20 can be increased.

[0029] Furthermore, the connecting plates 34 that connect adjacent back panels 30 are formed to extend in a direction perpendicular to the bridge axis and to connect the upper surfaces of adjacent back panels 30. As a result, the back panels 30 can be connected seamlessly across the direction perpendicular to the bridge axis by the connecting plates 34, and the step difference caused by the connecting plates 34 on the back panels 30 can be made extremely small.

[0030] In this case, the connecting plate 34 is provided with elongated holes 34a and 34b through which screws 35 for fastening the connecting plate 34 to the upper surface of the back panel 30 are inserted. The elongated holes 34a located on one side of adjacent back panel 30 are elongated in the direction perpendicular to the bridge axis, while the elongated holes 34b located on the other side of the back panel 30 are elongated in the direction of the bridge axis. This allows for the absorption of positional misalignment between the back panels 30 in the direction perpendicular to the bridge axis and in the direction of the bridge axis, enabling efficient connection of the back panels 30.

[0031] Furthermore, since the ends of adjacent back panels 30 perpendicular to the bridge axis are connected by an L-shaped end connecting plate 36 that covers the back panel 30 from the top surface to the end surface, the back panels 30 can be connected not only on the top surface but also on the end surface, thereby increasing the connection strength of each back panel 30.

[0032] Furthermore, the side panel 40 is formed by arranging a plurality of panel members 41 extending in the bridge axis direction in the vertical direction, and each panel member 41 is made of a material with higher corrosion resistance or rust resistance than the reinforcing member 32 of the back panel 30, thereby increasing the durability of the side panel 40 in long-term use.

[0033] In this case, the side panel 40 is formed by arranging multiple panel units 42, each consisting of a predetermined number of panel members 41, in a vertical direction. This allows the panel members 41 to be installed in predetermined quantities, facilitating on-site installation work. Furthermore, by combining multiple panel units 42 with different numbers of panel units 42 and panel members 41, side panels 40 of any height can be formed according to the specifications of the permanent scaffolding, thereby increasing versatility.

[0034] Furthermore, since the front portion 41c of the panel member 41 facing the outside of the scaffolding is formed to be inclined diagonally downward, water can be drained at the lower end of the front portion 41c, preventing rainwater from entering between each panel member 41.

[0035] In the above embodiment, a packing 34c is provided between the back panel 30 and the connecting plate 34, a packing 36a is provided between the back panel 30 and the end connecting plate 36, and a packing 31d is provided between the back panel 30 and the vertical beam 20. However, it is also possible to omit these packings.

[0036] Figures 19 to 21 show other embodiments of the side panel, and the same components as in the above embodiments are denoted by the same reference numerals.

[0037] The side panel 50 of this embodiment is formed by arranging a plurality of panel members 51 extending in the bridge axis direction in the same manner as in the previous embodiment. The panel members 51 are made of a material (e.g., aluminum plate) that has higher corrosion resistance or rust resistance than the material of the reinforcing member 32 of the back panel 30 (e.g., high corrosion-resistant plated steel sheet). The panel member 51 is formed by a member bent into a trapezoidal cross-section consisting of an upper surface portion 51a, a lower surface portion 51b, and a front surface portion 51c. The back side is open, and the front surface portion 51c is formed to slope downwards towards the front. The lower surface portion 51b is provided with a plurality of through holes 51d that lead to the outside. As shown in Figure 21, the holes 51d are provided only in the area of ​​approximately the front half of the lower surface portion 51b (the portion that does not overlap with the upper surface portion 51a of other panel members 51 arranged below).

[0038] Furthermore, the side panel 50 is formed by arranging a plurality of panel units 52 in the vertical direction, each of which is provided with a predetermined number of panel members 51 integrally. The combination of panel members 51 in the panel unit 52 is the same as in the above embodiment.

[0039] The panel unit 52 has vertically elongated connecting plates 53 that connect each panel member 51. The back sides of multiple panel members 51 stacked vertically are fixed to the connecting plates 53. Although not shown, the connecting plates 53 are provided at multiple locations in the width direction of the panel unit 52. In this case, the back side of each panel member 51 is open except for the connecting plates 53, and the sides of each panel member 51 are covered by side plates 54. The connecting plates 53 are provided with L-shaped mounting members 55 for attachment to the furring strips 47, and the mounting members 55 are attached to the upper and lower ends of the connecting plates 53.

[0040] Each panel unit 52 is attached to furring strips 47 provided at multiple locations in the vertical direction of the support column 21. That is, the panel unit 52 is fixed to the support column 21 by fixing each mounting member 55 of the panel unit 52 to the furring strips 47 with bolts or the like (not shown).

[0041] According to this embodiment, since the lower surface portion 51b of each panel member 51 is provided with a plurality of holes 51d that lead to the outside, ventilation and lighting can be performed through each of the holes 51d.

[0042] The above embodiments are examples of the present invention, and the present invention is not limited thereto. [Explanation of Symbols]

[0043] 1...Bridge, 10...Permanent scaffolding, 20...Longitudinal beam, 30...Back panel, 31...Exterior member, 32...Reinforcement member, 33...Fixing plate, 34...Connecting plate, 34a,34b...Slotted hole, 36...End connecting plate, 40...Side panel, 41...Panel member, 42...Panel unit, 50...Side panel, 51...Panel member, 51d...Hole, 52...Panel unit.

Claims

1. In a permanent scaffolding for a bridge, multiple back panels for workers to stand on are installed below the bridge in the direction of the bridge axis, and side panels are provided on both sides of the back panels perpendicular to the bridge axis, The aforementioned rear panel comprises exterior members that form both sides and the bottom surface of the rear panel, a top plate that forms the top surface of the rear panel, and reinforcing members disposed within the rear panel. The exterior components are formed from materials that have higher corrosion resistance or rust resistance than the top plate and reinforcing components. A permanent scaffolding for bridges characterized by the following features.

2. The reinforcing member is formed in a corrugated shape. The permanent scaffolding for bridges according to feature 1.

3. The rear panel is provided with a plurality of vertical beams that support both ends perpendicular to the bridge axis, The vertical beam consists of a member having an upper flange and a lower flange. The end of the rear panel is placed on the lower flange, The upper end surface and upper flange of the rear panel are fixed by a fixing plate. The fixing plate is formed to extend diagonally downward from the upper flange side toward the upper surface side of the rear panel. The permanent scaffolding for bridges according to feature 1.

4. It is equipped with connecting plates that connect adjacent back panels, The connecting plate is formed to extend perpendicular to the bridge axis and to connect the upper surfaces of adjacent back panels. The permanent scaffolding for bridges according to feature 1.

5. The connecting plate is provided with an elongated hole through which a fastening member for fastening the connecting plate to the upper surface of the back panel is inserted. The elongated holes located on one side of adjacent back panels are oriented so that they are elongated perpendicular to the bridge axis, while the elongated holes located on the other side of the back panel are oriented so that they are elongated in the direction of the bridge axis. The permanent scaffolding for bridges according to feature 4.

6. The ends of adjacent back panels perpendicular to the bridge axis are connected by L-shaped end connecting plates that cover the back panel from the top surface to the end surface. The permanent scaffolding for bridges according to feature 1.

7. The aforementioned side panel is formed by arranging a plurality of panel members extending in the bridge axis direction in the vertical direction. Each panel member is formed from a material with higher corrosion resistance or rust resistance than the reinforcing member of the back panel. The permanent scaffolding for bridges according to feature 1.

8. The side panel is formed by arranging a plurality of panel units, each consisting of a predetermined number of the panel members, in a vertical direction. The permanent scaffolding for bridges according to claim 7.

9. The panel member is formed such that its outer surface facing the outside of the scaffolding is inclined diagonally downwards. The permanent scaffolding for bridges according to claim 7.

10. The lower surface of the panel member is provided with a plurality of through holes that lead to the outside, and each hole is located in a part that does not overlap with the upper surface of another panel member located below it. The permanent scaffolding for bridges according to feature 9.

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