Maintenance methods for railway overpass structures, work platform structures, and floorboard sets.

Abstract

To provide a maintenance method for an overpass structure capable of shortening a maintenance construction period and saving labor.SOLUTION: The present disclosure relates to a maintenance method for an overpass structure that straddles a railway track. The maintenance method for an overpass structure includes a step of arranging a plurality of floor plates having the same shape so as to straddle an upline and a downline of a track. In the arranging step, a first end part of the plurality of floor plates is arranged on a central receiving base placed between the upline and the downline, and a second end part of the plurality of floor plates is arranged on an up-side receiving base placed outside in the width direction of the upline to form the work floor on the upline side, the first end part of the plurality of floor plates is placed on the central receiving base, and the second end part of the plurality of floor plates is placed on a down-side receiving base placed on the outside in the width direction of the downline to form the down-side work floor.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a maintenance method for overpass structures, a work floor structure, and a floorboard set.

Background Art

[0002] There are sections on railway lines where overpass structures are provided that straddle the tracks three-dimensionally (see Patent Document 1). Such overpass structures require regular inspections and repairs.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a maintenance method for overpass structures such as overpass bridges, there is a method of assembling a three-dimensional scaffold on the tracks using pipes, plates, etc. However, since the maintenance of overpass structures needs to be carried out within a limited time when the line is closed, the actual working time is limited by the time required for the assembly and disassembly of such scaffolds. Therefore, the maintenance period for one overpass structure becomes long. In addition, the assembly and disassembly of scaffolds require many parts and skilled techniques, and it is difficult to achieve labor saving.

[0005] One aspect of the present disclosure aims to provide a maintenance method for overpass structures that enables shortening of the maintenance period and labor saving.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a method for maintaining an overpass structure that spans a railway track. The method for maintaining an overpass structure comprises the steps of arranging a plurality of floor plates of the same shape so as to span the rails of the up and down lines of the track, and installing an aerial work platform on the plurality of floor plates that have been arranged.

[0007] In the placement process, the first end of each of the multiple floorboards is placed on the central support stand located between the up and down lines, and the second end of each of the multiple floorboards is placed on the up-side support stand located on the widthwise outer side of the up line to form the up line work platform. The first end of each of the multiple floorboards is placed on the central support stand, and the second end of each of the multiple floorboards is placed on the down-side support stand located on the widthwise outer side of the down line to form the down line work platform.

[0008] This configuration allows for the creation of a work platform on which aerial work platforms can operate in a relatively short time by arranging multiple floor slabs on the track. Therefore, maintenance time can be shortened. Furthermore, since multiple floor slabs of the same shape can be used in common on both the up and down lines, floor slab management becomes easier. This, in turn, reduces the labor required for maintenance.

[0009] In one aspect of this disclosure, during the placement process, multiple floorboards may be arranged such that a vertical gap is provided between the multiple floorboards and the rails. With this configuration, the height difference between the central support and the upward or downward support can be absorbed by the gap between the floorboards and the rails.

[0010] In one aspect of this disclosure, the length of a plurality of floor slabs in the width direction of the track may be equal to the distance between the centerlines of the up and down lines on the track. With such a configuration, floor slabs can be placed on the up and down lines without having to worry about the orientation of the ends of the floor slabs. This promotes a reduction in maintenance time and labor.

[0011] In one aspect of this disclosure, the floorboards may be made of fiber-reinforced plastic containing non-conductive fibers. Such a configuration allows for lighter floorboards. Furthermore, since the floorboards act as insulators, short circuits due to contact with the rails can be avoided.

[0012] In one aspect of this disclosure, during the installation process, adjustment materials for correcting the track's cant may be placed between the rail and multiple floor plates. With such a configuration, a work platform on which an aerial work platform can travel can be formed on a track with cant. As a result, floor plates can be used in common for both straight and canted sections, thus reducing maintenance costs.

[0013] In one aspect of this disclosure, the floor plates may have a flat upper surface and a lower surface having an upwardly recessed recess. Such a configuration can prevent interference between the floor plates and obstacles (e.g., derailment prevention guards) between the two rails.

[0014] In one aspect of this disclosure, a plurality of floorboards may have an upper board and a lower board, a side board enclosing the space between the upper board and the lower board, and a rib connecting the upper board and the lower board. The rib may have a first flange in contact with the upper board, a second flange in contact with the lower board, and a web connecting the first flange and the second flange. Such a configuration makes it possible to reduce the weight of the floorboards. Therefore, the burden of arranging and removing the floorboards can be reduced.

[0015] In one aspect of this disclosure, the bottom plate may have at least one first air hole located in a region that does not overlap with the central support, the upward support, and the downward support. The rib may have at least one second air hole that penetrates the web. Such a configuration can suppress swelling and denting of the floor plate caused by expansion and contraction due to temperature differences in the internal air of the floor plate.

[0016] In one aspect of this disclosure, the thickness of the upper plate may be greater than the thickness of the lower plate. With this configuration, damage to the upper plate due to the load of equipment (e.g., a gantry frame) used to lift the aerial work platform can be suppressed.

[0017] Another aspect of the present disclosure is a work platform structure for maintaining a railway track overpass structure. The work platform structure comprises a plurality of floor plates of the same shape arranged to straddle the rails of the up and down lines of the track, a central support positioned between the up and down lines, an up-side support positioned on the widthwise outer side of the up line, and a down-side support positioned on the widthwise outer side of the down line. The plurality of floor plates have a first end positioned on the central support and a second end positioned on either the up-side or down-side support.

[0018] Another aspect of the present disclosure is a floor plate set comprising a work platform structure for maintaining a railway track overpass. The floor plate set comprises a plurality of floor plates of the same shape that can be positioned to straddle the rails of the up and down lines of the track. The plurality of floor plates are configured such that their first ends are positioned on a central support located between the up and down lines, and their second ends are positioned on an up-side support located on the widthwise outer side of the up line or a down-side support located on the widthwise outer side of the down line.

[0019] With this configuration, a work platform on which an aerial work platform can travel can be constructed in a relatively short time using multiple floorboards. Therefore, maintenance time can be shortened. In addition, since multiple floorboards of the same shape can be used in common on both the up and down lines, floorboard management becomes easier, and maintenance can be made more efficient. [Brief explanation of the drawing]

[0020] [Figure 1] Figure 1 is a flowchart showing a maintenance method for an overpass structure in an embodiment. [Figure 2] Figure 2 is a schematic plan view showing the railway line, the overpass structure, and the work platform structure in the embodiment. [Figure 3] Figure 3 is a schematic perspective view of the work platform structure shown in Figure 2. [Figure 4]FIG. 4A is a schematic perspective view of a floor board in the work floor structure of FIG. 3, and FIG. 4B is a schematic plan view of a first end portion of the floor board of FIG. 4A. [Figure 5] FIG. 5A is a schematic front view of the work floor structure of FIG. 2, FIG. 5B is a schematic diagram showing the relationship between the floor board and the rail without load applied, and FIG. 5C is a schematic diagram showing the relationship between the floor board and the rail with load applied. [Figure 6] FIG. 6A is a schematic cross-sectional view of a central pedestal in the work floor structure of FIG. 2, FIG. 6B is a schematic cross-sectional view of a lower pedestal in the work floor structure of FIG. 2, and FIG. 6C is a schematic plan view of a stopper of the lower pedestal of FIG. 6B. [Figure 7] FIG. 7A is a schematic diagram showing an example of the arrangement procedure of the floor boards on the down line, FIG. 7B is a schematic diagram showing the next procedure of FIG. 7A, FIG. 7C is a schematic diagram showing the next procedure of FIG. 7B, and FIG. 7D is a schematic diagram showing the next procedure of FIG. 7C. [Figure 8] FIG. 8 is a schematic front view of an adjustment member in the work floor structure of FIG. 2. [Figure 9] FIG. 9 is a schematic cross-sectional view of the floor board of FIG. 4A. [Figure 10] FIG. 10 is a schematic exploded perspective view of the floor board of FIG. 9. [Figure 11] FIG. 11 is a schematic perspective view of a first rib in the floor board of FIG. 9.

DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First Embodiment] [1-1. Configuration] The method for maintaining the overpass structure shown in FIG. 1 includes an arrangement step S10, an aerial work vehicle installation step S20, a maintenance work step S30, and a removal step S40.

[0022] The maintenance method for overpass structures in this embodiment, as shown in Figure 2, applies to overpass structures 200 that are positioned to straddle railway tracks 100. The overpass structure 200 is an overpass that overlaps both the up line 101 and the down line 102 of the tracks 100 from above. Note that overpass structures also include tunnels, overhead lines, etc.

[0023] <Placement process> In this process, the work platform structure 300 shown in Figure 2 is formed. The work platform structure 300 is installed in at least the portion of the track 100 that overlaps with the overpass structure 200.

[0024] As shown in Figure 3, the work platform structure 300 comprises a plurality of floorboards 1, a central support base 11, an upward-facing support base 12, and a downward-facing support base 13. The work platform structure 300 is formed using a floorboard set comprising a plurality of floorboards 1.

[0025] Multiple floor panels 1 are arranged to straddle either the two rails 101A of the up line 101 or the two rails 102A of the down line 102. All of the multiple floor panels 1 are identical in shape.

[0026] In this embodiment, the X-axis is defined as the axis parallel to the longitudinal direction of the track 100 (i.e., the direction of rail extension) when the floor plate 1 is placed on the track 100, the Y-axis is defined as the axis parallel to the width direction of the track 100 (i.e., the direction of sleeper extension) when the floor plate 1 is placed on the track 100, and the Z-axis is defined as the axis parallel to the vertical direction when the floor plate 1 is placed on the track 100.

[0027] As shown in Figure 4A, each floor panel 1 is a strip-shaped member. The length of the floor panel 1 along the Y-axis is greater than the length along the X-axis. Furthermore, the floor panel 1 has a line-symmetric shape with respect to the center line that bisects the floor panel 1 in the longitudinal direction. In other words, the shape obtained by rotating the floor panel 1 by 180° around a rotation axis parallel to the Z-axis matches the shape of the floor panel 1 before rotation.

[0028] The floorboard 1 is constructed by connecting multiple plate materials made of fiber-reinforced plastic containing non-conductive fibers. Examples of non-conductive fibers include glass fibers and aramid fibers. The upper surface of the floorboard 1 is treated with a non-slip textured surface. The upper surface of the floorboard 1 may also be roughened by blasting. The floorboard 1 has a first end 2, a second end 3, a recess 4, and multiple notches 5 (see Figure 4B).

[0029] The first end 2 and the second end 3 are the ends of the floorboard 1 in the longitudinal direction (i.e., parallel to the Y-axis). In this embodiment, the shape of the first end 2 and the shape of the second end 3 are the same. The recess 4 is a portion of the lower surface of the floorboard 1 that is recessed upward. The recess 4 is provided in the central part of the floorboard 1 in the longitudinal direction.

[0030] As shown in Figure 4B, the multiple notches 5 are provided at the first end 2, on the edge parallel to the X-axis and the edge parallel to the Y-axis, respectively. Similarly, the multiple notches 5 are also provided at the second end 3, on the edge parallel to the X-axis and the edge parallel to the Y-axis, respectively.

[0031] The multiple notches 5 are made up of recessed portions that face inward from the floor plate 1. When placing the floor plate 1 on the track 100, workers can place their hands on the multiple notches 5, which helps prevent fingers from getting caught between adjacent floor plates 1 or between the floor plate 1 and the support base. The notches 5 may be provided only on the edges parallel to the X-axis, or only on the edges parallel to the Y-axis.

[0032] As shown in Figure 5A, the floor plate 1, which is placed on the up track 101, is supported by a central support base 11 and an up-side support base 12, and is positioned to cover the two rails 101A and the two derailment prevention guards 101B of the up track 101.

[0033] The floor plate 1, positioned above the down track 102, is supported by a central support base 11 and a down-side support base 13, and is positioned to cover the two rails 102A and two derailment prevention guards 102B of the down track 102.

[0034] On both the up track 101 and the down track 102, the two derailment prevention guards 101B and 102B are positioned inside the two rails 101A and 102A. Furthermore, the upper surfaces of the derailment prevention guards 101B and 102B are positioned above the top surfaces of the rails 101A and 102A.

[0035] The floor plate 1 is positioned so that the recess 4 overlaps with the derailment prevention guards 101B and 102B in the vertical direction. The recess 4 does not overlap with the rails 101A and 102A. As shown in Figure 5B, the corners of the recess 4 are curved in an arc shape to suppress stress concentration.

[0036] As shown in Figure 5B, when no load is applied to the floor plate 1 from above (i.e., when no aerial work platform is on it), the floor plate 1 does not come into contact with the rails 101A and 102A. In other words, there is a vertical gap between the floor plate 1 and the rails 101A and 102A. Therefore, the floor plate 1 only comes into contact with the rails 101A and 102A when it is subjected to a load from the aerial work platform. This prevents the edges of the floor plate 1 from lifting during maintenance work.

[0037] As shown in Figure 5C, when a load is applied to the floor plate 1 from above, the central part of the floor plate 1 flexes downward, causing the floor plate 1 to come into contact with the rails 101A and 102A. As a result, the floor plate 1 is supported by the rails 101A and 102A. Note that even when the floor plate 1 is in contact with the rails 101A and 102A, the floor plate 1 does not come into contact with the derailment prevention guards 101B and 102B.

[0038] As shown in Figure 5A, the length L of the floor plate 1 in the width direction of the track 100 (i.e., the length along the X-axis) is equal to the distance D between the center line C1 of the up line 101 and the center line C2 of the down line 102 on the track 100 (i.e., the distance between the center lines of the track 100).

[0039] The central support 11, the upward support 12, and the downward support 13 that hold the floor plate 1 are arranged along the track 100. These support platters are located outside the building clearance and are permanent fixtures that are not installed or removed during maintenance.

[0040] The central support base 11 is positioned between the up line 101 and the down line 102. Specifically, the central support base 11 is positioned at a location where the distance from the center line C1 of the up line 101 and the center line C2 of the down line 102 are equal. The central support base 11 is shared by the floor plate 1 positioned on the up line 101 and the floor plate 1 positioned on the down line 102.

[0041] The upward support base 12 is positioned on the outer side in the width direction of the upward track 101. The downward support base 13 is positioned on the outer side in the width direction of the downward track 102. The distance between the upward support base 12 and the central support base 11 is equal to the distance between the downward support base 13 and the central support base 11.

[0042] As shown in Figure 6A, the central support base 11 has a base portion 11A and a receiving portion 11B. The base portion 11A has an upper surface that supports the first end portions 2 of each of the two floor plates 1. The base portion 11A is made of, for example, a steel pipe.

[0043] The receiving portion 11B protrudes upward from the upper surface of the base portion 11A. The receiving portion 11B has recesses on both sides in the width direction of the track 100 into which the first end portion 2 of the floor plate 1 can be inserted along the Y axis. The receiving portion 11B can be made of, for example, a general-purpose H-shaped steel.

[0044] As shown in Figure 6B, the lower support base 13 has a base 13A, a stopper 13B, and a bolt 13C. The base 13A has an upper surface that supports the second end 3 of the floor plate 1. The base 13A is made of, for example, a steel pipe.

[0045] The stopper 13B is attached to the upper surface of the base 13A by bolts 13C. The stopper 13B has a side wall facing the second end 3 in the width direction of the track 100, and a bottom wall that supports the side wall and is attached to the base 13A. The stopper 13B can be made of, for example, a general-purpose L-shaped steel.

[0046] As shown in Figure 6C, the stopper 13B has a plurality of slit holes 13D arranged side by side along the longitudinal direction of the raceway 100. The slit holes 13D are elongated holes that extend in the width direction of the raceway 100. The bolts 13C are inserted through the slit holes 13D.

[0047] The stopper 13B is configured to slide in the width direction of the track 100 relative to the bolt 13C and the base 13A by means of the slit hole 13D. Therefore, by adjusting the position of the stopper 13B to match the position of the second end 3 of the floor plate 1, movement of the floor plate 1 in the width direction of the track 100 (i.e., in the longitudinal direction of the floor plate 1) can be suppressed.

[0048] As shown in Figure 5A, the upward support base 12 is an inverted version of the downward support base 13 and has the same configuration and function as the downward support base 13.

[0049] The following describes the procedure for forming the work platform structure 300. In the arrangement step S10, multiple floor plates 1 of the same shape are arranged so as to straddle the rails of the up line 101 and the down line 102 of the track 100. In this step, the multiple floor plates 1 are arranged so that there is a vertical gap between the multiple floor plates 1 and the rails 101A and 102A.

[0050] As shown in Figure 1, this process includes an upward work platform formation step S11 and a downward work platform formation step S12. The order of these steps is not important. Furthermore, these steps may be repeated alternately.

[0051] In the upward work platform formation process S11, the first end 2 of each of the multiple floor plates 1 is placed on the central support base 11, and the second end 3 of each of the multiple floor plates 1 is placed on the upward support base 12, thereby forming the work platform on the upward track 101 side (i.e., placed above the upward track 101).

[0052] In the downward work platform formation process S12, the first end 2 of each of the multiple floor plates 1 is placed on the central support base 11, and the second end 3 of each of the multiple floor plates 1 is placed on the downward support base 13, thereby forming the work platform on the downward line 102 side (i.e., placed on the downward line 102).

[0053] The procedure for forming the downward work platform S12 will be described below, but the procedure for forming the upward work platform S11 is the same, except that the downward support 13 is replaced with the upward support 12.

[0054] As shown in Figure 7A, first, with the second end 3 of the floor plate 1 raised higher than the first end 2, the first end 2 is inserted into the recess of the receiving portion 11B of the central support base 11. Next, as shown in Figure 7B, the second end 3 of the floor plate 1 is lowered toward the descending support base 13 and placed on the base portion 13A. At this time, the stopper 13B of the descending support base 13 is positioned outside the width direction of the track 100 relative to the second end 3 (i.e., in a position where it does not interfere).

[0055] After the second end portion 3 is placed, as shown in Figure 7C, the floor plate 1 is moved toward the central support base 11, thereby pressing the first end portion 2 against the receiving portion 11B of the central support base 11. With the first end portion 2 pressed against the receiving portion 11B, as shown in Figure 7D, the stopper 13B of the downward support base 13 is brought close to the second end portion 3, and the position of the stopper 13B is fixed with a bolt 13C.

[0056] By repeating these procedures for multiple floor plates 1 on both the up line 101 and the down line 102, multiple floor plates 1 are arranged in two rows along the longitudinal direction of the track 100. The upper surfaces of the multiple floor plates 1 arranged on the track 100 constitute a floor surface that supports workers and the aerial work platform 400.

[0057] Furthermore, if the track 100 has superelevation (cant), an adjustment material 21 for correcting the superelevation of the track 100 is placed between the rail 102A and the multiple floorboards 1, as shown in Figure 8. Although Figure 8 shows an example of the arrangement of the adjustment material 21 on the down line 102, a similar arrangement is possible on the up line 101.

[0058] The adjustment member 21 constitutes part of the work platform structure 300. The adjustment member 21 has a triangular member 21A, two beam members 21B, and two track pads 21C.

[0059] The triangular member 21A is placed on the top surfaces of the two rails 102A. The triangular member 21A is thicker towards the lower side of the incline in the width direction of the track 100. The triangular member 21A has two engaging portions 21D that engage with either side of the two rails 102A from above.

[0060] The two beam members 21B are placed on the upper surface of the triangular member 21A. The thicknesses of the two beam members 21B may be different. For example, if the upper surface of the triangular member 21A is inclined, the thickness of the beam member 21B on the lower side of the inclination may be greater than the thickness of the beam member 21B on the upper side of the inclination.

[0061] The two track pads 21C are placed one on each of the upper surfaces of the two beam members 21B. The adjustment member 21 may have only one track pad 21C. In other words, the track pad 21C may be placed on only one of the two beam members 21B.

[0062] Furthermore, the thickness of the adjustment member 21 is set such that a gap exists between the adjustment member 21 (i.e., the beam member 21B or track pad 21C) and the floor plate 1 when no load is applied to the floor plate 1 from above.

[0063] <Aerial work platform installation process> In this process, an aerial work platform 400 (see Figure 5A) is installed on top of multiple floorboards 1 (i.e., work platforms) that have been arranged.

[0064] As the aerial work platform 400, a known work vehicle equipped with a basket in which a worker rides, an arm for moving the basket up and down, and a means of travel can be used. As the means of travel, a crawler that distributes surface pressure is preferred.

[0065] <Maintenance work process> In this process, a high-altitude work vehicle 400 installed on a work platform is used to perform maintenance work (i.e., inspection and repair) on the overpass structure 200.

[0066] <Removal process> In this process, after the maintenance work is completed, the aerial work platform 400 and the multiple floorboards 1 are removed. Specifically, after lowering the aerial work platform 400 from the work platform, the multiple floorboards 1 are removed from the central support 11, the upward support 12, and the downward support 13. The procedure for removing the multiple floorboards 1 is the reverse of the procedure for forming the work platform described above.

[0067] <Details of the floorboards> As shown in Figures 9 and 10, the floorboard 1 has an upper plate 6, a lower plate 7, a side plate 8, a first rib 9A, a second rib 9B, and a third rib 9C.

[0068] The upper plate 6 has a flat top surface. The lower plate 7 has an upwardly recessed recess 4. The lower plate 7 has a plurality of first air holes 71 arranged in areas that do not overlap with the central support base 11, the upward support base 12, and the downward support base 13. In this embodiment, the first air holes 71 are arranged between the first rib 9A and the second rib 9B, and between the second rib 9B and the third rib 9C. Also, the thickness of the upper plate 6 is greater than the thickness of the lower plate 7.

[0069] The side plate 8 encloses the space between the top plate 6 and the bottom plate 7. Specifically, the side plate 8 extends upward from the periphery of the bottom plate 7 and is integrated with the bottom plate 7. The side plate 8 has a joint portion 81 that is superimposed on the top plate 6 from below.

[0070] The first rib 9A, the second rib 9B, and the third rib 9C are each positioned within the internal space of the floor plate 1 and connect the upper plate 6 and the lower plate 7 in the vertical direction. As shown in Figure 11, the first rib 9A has a first flange 91, a second flange 92, a web 93, a plurality of second air holes 94, and an auxiliary recess 95.

[0071] The first flange 91 is a plate-shaped portion that contacts the upper plate 6 from below. The second flange 92 is a plate-shaped portion that contacts the lower plate 7 from above. The web 93 is a plate-shaped portion that connects the first flange 91 and the second flange 92 in the vertical direction. The second air hole 94 penetrates the web 93. In this embodiment, one second air hole 94 is provided at each of the longitudinal ends of the first flange 91. The auxiliary recess 95 is a portion that overlaps with the recess 4 of the lower plate 7 and is recessed upward.

[0072] The second rib 9B and the third rib 9C each have the same shape as the first rib 9A. The first rib 9A, the second rib 9B, and the third rib 9C are arranged side by side in the thickness direction of the web 93 (i.e., the width direction of the floorboard 1).

[0073] The spacing between the first rib 9A, the second rib 9B, and the third rib 9C should be determined to match the width of the crawler track of the aerial work platform. This reduces the deflection of the upper plate 6 when the aerial work platform is moving, thereby preventing the aerial work platform from tilting.

[0074] [1-2. Effects] According to the embodiments described in detail above, the following effects can be obtained. (1a) By arranging multiple floor slabs 1 on the track 100, a work platform on which an aerial work platform 400 can travel can be constructed in a relatively short time. Therefore, the maintenance period can be shortened. In addition, since multiple floor slabs 1 of the same shape can be used in common on the up line 101 and the down line 102, the management of the floor slabs 1 becomes easier. Therefore, maintenance can be made more efficient.

[0075] Furthermore, if either the up line 101 or the down line 102 cannot be closed due to vehicle traffic or other reasons, the floorboard 1 can be placed on only one of the up line 101 or the down line 102 to carry out the work.

[0076] (1b) By arranging the floorboard 1 such that there is a vertical gap between the floorboard 1 and the rails 101A and 102A, the height difference between the central support 11 and the upward support 12 or downward support 13 can be absorbed by the gap between the floorboard 1 and the rails 101A and 102A.

[0077] (1c) The length of the floor plate 1 in the width direction of the track 100 is equal to the distance between the center line C1 of the up line 101 and the center line C2 of the down line 102. This allows the floor plate 1 to be placed on the up line 101 and the down line 102 without having to worry about the orientation of the ends of the floor plate 1. This promotes a reduction in maintenance time and labor.

[0078] (1d) The floorboard 1 is made of fiber-reinforced plastic containing non-conductive fibers, which makes the floorboard 1 lighter. Also, since the floorboard 1 acts as an insulator, short circuits due to contact with rails 101A and 102A can be avoided.

[0079] (1e) By placing adjustment material 21 for correcting the cant of track 100 between rails 101A, 102A and floor plate 1, a work platform can be formed on a track with cant, on which an aerial work platform 400 can travel. As a result, floor plate 1 can be used in common for both straight sections and canted sections, thus reducing maintenance costs.

[0080] (1f) The lower surface of the floorboard 1 has a recess 4, which prevents interference between the floorboard 1 and obstacles (e.g., derailment prevention guards) between the floorboard 1 and the two rails.

[0081] (1g) The floorboard 1 can be made lighter by having an upper plate 6, a lower plate 7, a side plate 8, and ribs 9A, 9B, and 9C. Therefore, the burden of installing and removing the floorboard 1 can be reduced.

[0082] (1h) The floorboard 1 has a first air hole 71 and a second air hole 94, which suppresses swelling and denting of the floorboard 1 caused by expansion and contraction due to temperature differences in the internal air of the floorboard 1. (1i) The thickness of the upper plate 6 of the floor plate 1 is greater than the thickness of the lower plate 7, which helps to prevent damage to the upper plate 6 due to the load of equipment (e.g., a gantry frame) used to move the aerial work platform.

[0083] [2. Other Embodiments] While embodiments of this disclosure have been described above, it goes without saying that this disclosure is not limited to the embodiments described above and can take various forms.

[0084] (2a) In the maintenance method for the overpass structure of the above embodiment, it is not necessary to provide a vertical gap between the floor plate and the rail. In other words, the floor plate may be positioned so that it is in contact with the rail.

[0085] (2b) In the maintenance method for the overpass structure of the above embodiment, the length of the floor plate in the width direction of the track may be greater than or less than the distance between the center line of the up line and the center line of the down line. Also, the floor plate does not necessarily have to be symmetrical in the longitudinal direction. For example, the shape of the first end and the shape of the second end of the floor plate may be different.

[0086] (2c) In the maintenance method for the overpass structure of the above embodiment, the floor plate does not necessarily have to be made of fiber-reinforced plastic containing non-conductive fibers. For example, the floor plate may be made of a metal material.

[0087] (2d) The functions of one component in the above embodiment may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, some parts of the configuration of the above embodiment may be omitted. Also, at least some parts of the configuration of the above embodiment may be added to, substituted for, or otherwise used in the configuration of other above embodiments. Any aspect of the technical concept specified by the wording of the claims is an embodiment of the present disclosure. [Explanation of symbols]

[0088] 1...Floorboard, 2...First end, 3...Second end, 4...Recess, 5...Notch, 6...Top board 7...Bottom plate, 8...Side plate, 9A, 9B, 9C...Ribs, 11...Central support base, 11A...Base, 11B...receiving part, 12...upper receiving base, 13...downward receiving base, 13A...base, 13B...Stopper, 13C...Bolt, 13D...Slit hole, 21...Adjustment material, 21A...Triangular member, 21B...Beam member, 21C...Track pad, 21D...Engaging part 71...First air vent, 81...Joint, 91...First flange, 92...Second flange, 93...Web, 94...Second air vent, 95...Auxiliary recess, 100...Track, 101...Up line 101A...rail, 101B...derailment prevention guard, 102...down line, 102A...rail 102B... Derailment prevention guard, 200... Overpass structure, 300... Work platform structure, 400... Aerial work platform.

Claims

1. A method for maintaining overpass structures that cross railway tracks, The process involves arranging multiple floorboards of the same shape so as to straddle the rails of the up and down lines of the aforementioned track, The process of installing an aerial work platform on the multiple floor plates that have been arranged, Equipped with, A method for maintaining a railway overpass structure, comprising the steps of arranging the above-mentioned components, wherein the first end of each of the plurality of floorboards is placed on a central support located between the up-line and the down-line, and the second end of each of the plurality of floorboards is placed on an up-side support located on the widthwise outer side of the up-line to form a work platform on the up-line side, and the first end of each of the plurality of floorboards is placed on the central support, and the second end of each of the plurality of floorboards is placed on a down-side support located on the widthwise outer side of the down-line to form a work platform on the down-line side.

2. A method for maintaining an overpass structure according to claim 1, A method for maintaining a railway overpass structure, wherein in the step of arranging the floorboards, the multiple floorboards are arranged such that a vertical gap is provided between the multiple floorboards and the rails.

3. A method for maintaining an overpass structure according to claim 1 or claim 2, A method for maintaining a railway overpass structure, wherein the length of the plurality of floor plates in the width direction of the track is equal to the distance between the center line of the up track and the center line of the down track.

4. A method for maintaining an overpass structure according to claim 1 or claim 2, A method for maintaining a railway overpass structure, wherein the aforementioned multiple floorboards are made of fiber-reinforced plastic containing non-conductive fibers.

5. A method for maintaining an overpass structure according to claim 1 or claim 2, A maintenance method for a railway overpass structure, wherein in the step of arranging the above-mentioned components, adjustment materials for correcting the cant of the track are placed between the rails and the plurality of floor plates.

6. A method for maintaining an overpass structure according to claim 1 or claim 2, The aforementioned multiple floorboards are A flat top surface, A lower surface having an indented recess at the top, A maintenance method for railway overpass structures, comprising the following:

7. A method for maintaining an overpass structure according to claim 1 or claim 2, The aforementioned multiple floorboards are The top board and the bottom board, A side plate enclosing the space between the upper plate and the lower plate, A rib connecting the upper plate and the lower plate, It has, The aforementioned rib is A first flange that contacts the upper plate, A second flange that contacts the lower plate, A web connecting the first flange and the second flange, A maintenance method for railway overpass structures, comprising the following:

8. A method for maintaining a railway overpass structure according to claim 7, The lower plate has at least one first air hole located in a region that does not overlap with the central support base, the upward support base, and the downward support base. A method for maintaining a railway overpass structure, wherein the rib has at least one second air hole that penetrates the web.

9. A method for maintaining a railway overpass structure according to claim 7, A maintenance method for a railway overpass structure, wherein the thickness of the upper plate is greater than the thickness of the lower plate.

10. A work platform structure for maintaining overpasses that cross railway tracks, Multiple floorboards of the same shape are arranged to straddle the rails of the up and down lines of the aforementioned track, A central support platform positioned between the aforementioned inbound track and the aforementioned outbound track, An upward-side support base is positioned on the outer side in the width direction of the aforementioned upward-bound track, A downward-side support base is positioned on the outer side in the width direction of the aforementioned downward-bound track, Equipped with, The aforementioned plurality of floorboards are arranged in a work floor structure in which the first end of each floorboard is positioned on the central support and the second end of each floorboard is positioned on the upward support or the downward support.

11. A set of floorboards that constitute a work platform structure for maintaining an overpass structure that crosses railway tracks, The aforementioned track comprises multiple floor plates of the same shape that can be positioned to straddle the rails of the up and down lines, respectively. A floorboard set comprising a plurality of floorboards, wherein the first end of each floorboard is positioned on a central support located between the uphill and downhill tracks, and the second end of each floorboard is positioned on an uphill support located on the widthwise outer side of the uphill track or on a downhill support located on the widthwise outer side of the downhill track.

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