Simple work booth

Abstract

To provide a simple work booth capable of preventing scattering of dust generated during maintenance of an upper surface of girder members of a railway bridge and shortening the maintenance work time for the upper surface of the girder members.SOLUTION: The present invention is a simple work booth 1 which covers an opening O opened and formed in at least a part of a portion supporting a track 3 on an upper surface of a bridge girder 10 of an upper sheet portion 20d which serves as a curing portion covering the upper surface of the bridge girder 10 of a railway bridge having the steel bridge girder 10 supporting the track 3 having a pair of rails 31, 31, to form a work space A1 inside, and comprises a shielding portion 5 which can be installed on the rails 31 facing the opening O, which surrounds a periphery of the opening O and has an outer periphery covering all four sides in the lateral direction and a roof portion covering the upper part of the outer periphery, forming the work space A1 inside.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a simple work booth. [Background technology]

[0002] Railway bridges are constructed over rivers and depressions, and are equipped with steel girder members that support a track consisting of multiple sleepers and a pair of rails installed on the sleepers. Although such railway bridges are treated with rust prevention and paint, the girder members will rust if exposed to rain and wind for many years. If the rust penetrates into the steel material that constitutes the girder members, the girder members will become brittle and their load-bearing capacity will decrease, so maintenance of the girder members is required before this happens.

[0003] Specifically, girder member maintenance involves blasting, which uses compressed air to strike an abrasive (ore, non-ferrous metal, etc.) against the rust on the surface of the girder member to remove the rust (see Patent Document 1, for example), and then applying paint to the surface of the girder member from which the rust has been removed to provide an anti-rust treatment.However, in blasting, dust is generated when an abrasive is blown against the girder member with compressed air, so it is necessary to prevent the scattering of the dust. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-99353 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, when carrying out the above-mentioned maintenance on the side and underside of the girder member, a protective sheet is placed around the periphery of the suspended scaffolding suspended from the girder member, the side and underside of the girder member are covered with the protective sheet, and a work space is secured inside the protective sheet, and then a worker blasts and performs rust prevention treatment on the side and underside of the girder member from above the suspended scaffolding in the above-mentioned work space. Therefore, maintenance can be carried out on the side and underside of the girder member while securing a work space and preventing the scattering of dust.

[0006] However, because the suspended scaffolding is suspended below the girder member, maintenance of the upper surface of the girder member cannot be performed from the suspended scaffolding. Therefore, when performing maintenance on the upper surface of the girder member, a worker must first place a weight on the protective sheet that covers the maintenance area on the upper surface of the girder member to immobilize the protective sheet, and then crawl between the protective sheet and the girder member to perform maintenance on the upper surface of the girder member.

[0007] However, this method created many gaps between the curing sheet and the girder members and the track, which allowed dust to leak out, and it was not possible to adequately prevent dust from scattering. Furthermore, because no working space was provided between the curing sheet and the top surface of the girder members, workers had to perform maintenance while lying on their stomachs under the curing sheet, which imposed a great burden on the workers when performing maintenance work on the top surface of the girder members, and the maintenance work took a long time.

[0008] Therefore, an object of the present invention is to provide a simple work booth that can prevent the scattering of dust generated during maintenance of the upper surface of a railway bridge's girder members and can shorten the maintenance work time for the upper surface of the girder members. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the simple work booth of the present invention is a simple work booth that covers an opening formed in at least a part of the upper surface of a girder member of a curing part that covers the upper surface of the girder member of a railway bridge that has a steel girder member supporting a track having a pair of rails, to form a work space inside, and is characterized in that it is equipped with a shielding part that can be installed on the rail facing the opening, surrounds the periphery of the opening and has an outer periphery that covers all four sides in the lateral direction and a roof part that covers the upper part of the outer periphery, forming a work space inside. According to this configuration, when the shielding part is installed on the rail facing the opening, a work space is formed above the opening where a worker can perform maintenance work on the upper surface of the girder member.

[0010] In addition, in the simple work booth of the present invention, the shielding section may have a framework structure including a frame body that can be installed on a rail and that surrounds the periphery of the opening, a plurality of support columns that stand from the frame body, and a roof frame that is spanned between the upper ends of the support columns, and a protective sheet that is placed over the framework structure and covers the upper part and all four sides of the framework structure. With this configuration, the weight of the simple work booth can be reduced because the periphery of the opening is covered with a protective sheet. This makes it easier to transport the simple work booth. This reduces the time required to set up the simple work booth, ensuring time for maintenance work on the upper surface of the girder member.

[0011] Furthermore, the simple work booth of the present invention may be provided with wheels that are provided at least at four locations on the front, back, left and right sides of the lower part of the shielding part and can run on rails. With this configuration, the simple work booth can move by running on the rails, making it easy to transport the simple work booth and shortening the time it takes to move the simple work booth. Therefore, the time it takes to set up the simple work booth can be shortened, ensuring time for maintenance work on the upper surface of the girder member.

[0012] In the simple work booth of the present invention, the shielding portion may be installed so as to straddle the pair of rails and may have an insulating portion that insulates the electrical connection between the pair of rails. With this configuration, the electrical connection between the rails is insulated by the insulating portion, so that it is possible to prevent the rails from shorting out through the shielding portion of the simple work booth.

[0013] The simple work booth of the present invention also includes a fork for connecting the wheels to the shielding portion, the fork having a plate connected to the lower portion of the shielding portion and a fork body extending from the lower end of the plate in two directions to hold the wheels rotatably, and the wheels and the fork may have insulating portions that do not conduct electricity. According to this configuration, the wheels that contact the rails have insulating portions that do not conduct electricity, so that the rails can be prevented from shorting out through the shielding portion. Furthermore, according to this configuration, if the wheels derail from the rails, the rails come into contact with a plate that is provided at the lower portion of the shielding portion and is made of an insulating material, so that the rails can be prevented from shorting out.

[0014] In the simplified work booth of the present invention, the curing sheet may have a sheet body that covers the top and all four sides of the framework structure when placed over the framework structure, and sheet extensions that extend from the ends of the sheet body on each of the four sides. This configuration increases the contact area of ​​the curing sheet with the top surface of the girder material and the bridge sidewalk or temporary scaffolding installed on the side of the girder material, improving the airtightness of the work space and more reliably preventing dust leakage from within the work space. Furthermore, the curing sheet can be prevented from curling up by various methods, such as placing weights such as sandbags on the sheet extensions or fastening them with tape.

[0015] In addition, in the simple work booth of the present invention, at least one of the multiple sheet extensions that extends along the longitudinal direction of the girder member may have multiple slits extending along the extension direction.

[0016] Here, many obstacles such as sleepers, rails, derailment prevention guards, and switches are provided along the length of the upper surface of the girder, but with this configuration, multiple slits are provided in the sheet extension extending along the length of the girder, so the sheet extension can avoid the obstacles and touch the ground on the girder. This reduces the gap between the sheet extension and the upper surface of the girder, improving the airtightness of the work space. Effect of the Invention

[0017] The simple work booth of the present invention can prevent the scattering of dust generated during maintenance of the upper surface of a girder member of a railway bridge and can shorten the maintenance work time for the upper surface of the girder member. [Brief description of the drawings]

[0018] [Figure 1] This is a view of the girder member from the longitudinal direction with the curing device and simple work booth installed. [Diagram 2] This is a view of the girder member from the short side direction with the curing device and simple work booth installed. [Diagram 3] FIG. 2 is an enlarged view of the end of a sleeper. [Figure 4] This shows the state in which the upper sheet portion is stretched between the sleepers as viewed from the axial direction of the sleepers. [Diagram 5] (A) is a front view of the holder attached to the end of a sleeper, (B) is a side view of the holder attached to the end of a sleeper, and (C) is a plan view of the holder attached to the end of a sleeper. [Figure 6] FIG. 2 is an enlarged plan view showing a bridge girder and a portion of the temporary scaffolding installed to the side of the bridge girder. [Figure 7] FIG. 2 is a perspective view of a framework structure of the simple work booth of the present embodiment. [Figure 8] FIG. 2 is an enlarged perspective view showing a portion of the simple work booth of the present embodiment. [Figure 9] FIG. 1 is a perspective view of a simple work booth according to the present embodiment. [Figure 10]FIG. 11 is a front view of another embodiment of a simple work booth installed on rails attached to a girder member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, a simplified work booth 1 of the present invention that can be used for the maintenance of railway bridges will be described with reference to the drawings. The same reference numerals used throughout the drawings indicate the same parts.

[0020] 1 and 2, a railway bridge comprises a bridge girder 10 as a girder member that spans land across a river or a depression, and a track 3 supported on the bridge girder 10. The track 3 comprises a number of sleepers 30 arranged at a predetermined interval on the upper surface of the bridge girder 10 along the longitudinal direction of the bridge girder 10, and a pair of rails 31, 31 installed on each sleeper 30 and extending along the longitudinal direction of the bridge girder 10. Note that the track 3 in this embodiment is a single track with only one pair of rails 31, 31 as shown in FIG. 1, but may be a double track with two pairs of rails 31, 31 for an up line and a down line.

[0021] 1, the bridge girder 10 includes a pair of left and right beam members 10a, 10a each including a pair of upper and lower flat flange portions 10a1, 10a2 and a web 10a3 connecting the centers of the upper flange portion 10a1 and the lower flange portion 10a2, and multiple braces 10b bridged between the beam members 10a, 10a. Note that the shape of the bridge girder 10 described above is merely an example, and it may be, for example, a box-shaped beam material.

[0022] The simple work booth 1 of this embodiment will be described taking as an example a case where it is used on a railway bridge where a bridge side walkway 11 is provided on the side of the bridge girder 10. The bridge side walkway 11 is equipped with a walkway floor 11a extending along the longitudinal direction of the bridge girder 10 and a parapet 11b rising from the side of the walkway floor 11a on the side opposite the track, and workers can safely move along the side of the bridge girder 10 by using the bridge side walkway 11. The simple work booth 1 may also be used for maintenance of a railway bridge where a bridge side walkway 11 is not provided.

[0023] When performing maintenance on the bridge girder 10 of such a railway bridge, a curing system is installed on the bridge girder 10, the curing system consisting of a simple work booth 1 which forms a work space A1 for performing maintenance on the top surface of the bridge girder 10, and a curing device 2 which forms a work space A2 for performing maintenance on the side and underside of the bridge girder 10.

[0024] Below, each part of the simplified work booth 1 and the curing device 2 that constitute the curing system will be described in detail. In the following description, unless otherwise specified, the longitudinal direction of the bridge girder 10 will be referred to as the front-rear direction, and the transverse direction of the bridge girder 10 will be referred to as the left-right direction.

[0025] First, the curing device 2 in this embodiment will be described in detail. As shown in Fig. 1 to Fig. 6, the curing device 2 in this embodiment includes rod materials 14 arranged along the front-rear direction via holders 13 on the left and right sides of the bridge girder 10, a scaffolding body 40 suspended from the bridge girder 10 and arranged at a position spaced downward from the lower end of the bridge girder 10, extending along the front-rear direction and having a width wider than the left-right width of the bridge girder 10 as viewed from the front-rear direction, a plurality of pillars 41 standing up from each side end of the scaffolding body 40 and arranged at a predetermined interval along the extension direction of the scaffolding body 40, and cross members 42 each spanning between adjacent pillars 41 in the front-rear direction and facing the rod materials 14, and a curing sheet 20 covering the periphery of the bridge girder 10.

[0026] This curing sheet 20 has a lower sheet portion 20a fixed to the upper surface of the scaffolding main body 40 and covering the underside of the bridge girder 10, a pair of left and right side sheet portions 20b, 20b extending upward from the left and right ends of the lower sheet portion 20a, respectively, and fixed to the supports 41 and cross members 42 to cover the sides of the bridge girder 10, a roof sheet portion 20c extending from the upper ends of each side sheet portion 20b toward the bridge girder 10 with its tip fixed to the rod material 14, respectively, to cover the upper part of the scaffolding main body 40, and a plurality of upper sheet portions 20d stretched between the sleepers 30, 30, respectively, to cover the upper surface of the bridge girder 10, and fixed to the roof sheet portion 20c. Although not shown, the curing sheet 20 also has a front sheet portion and a rear sheet portion covering the front and rear ends of the bridge girder 10.

[0027] In this way, by covering the periphery of the bridge girder 10 with the protective sheet 20, a work space A2 is formed inside the protective sheet 20. Therefore, a worker can perform maintenance on the side and underside of the bridge girder 10 from above the scaffolding body 40 of the suspended scaffolding 4 located within the work space A2, and can prevent dust from leaking out of the work space A2 even if blasting work is performed during maintenance.

[0028] In addition, although not shown, a handrail rail is suspended between adjacent posts 41, 41 in the front-to-rear direction, below the cross member 42, and this handrail rail prevents the worker from falling from the scaffolding main body 40.

[0029] The suspended scaffolding 4 is suspended from the bridge girder 10 by attaching the suspension parts 44 provided at the upper ends of the multiple chains 43 attached to the scaffolding main body 40 to the lower flange parts 10a2 of the beam members 10a in the bridge girder 10. However, the suspended scaffolding 4 may be suspended from the bridge girder 10 by attaching the suspension parts 44 to a part other than the lower flange part 10a2 of the bridge girder 10, for example, the upper flange part 10a1.

[0030] Although not shown, mesh sheets are attached to the left and right pillars 41 arranged to sandwich the bridge girder 10, respectively, to cover the bridge girder 10 and the curing device 2 from the sides. In this case, in order to cover the side of the parapet 11b of the bridge side walk 11 with the mesh sheet as well, the upper end of the left side pillar 41 on the bridge side walk 11 side of the bridge girder 10 faces the upper end of the parapet 11b of the bridge side walk 11 in the horizontal direction. Therefore, in this embodiment, the left side pillar 41 on the bridge side walk 11 side is longer than the right side pillar 41, but the lengths of the left and right pillars 41 may be the same.

[0031] The above-described configuration of the suspended scaffolding 4 is merely one example, and is not particularly limited as long as it functions as a scaffolding for performing maintenance on the sides and underside of the bridge girder 10.

[0032] The curing sheet 20 is, for example, a polyethylene sheet, and the lower sheet portion 20a, the side sheet portion 20b, the roof sheet portion 20c, and the upper sheet portion 20d that constitute the curing sheet 20 are each divided into separate sheets. The lower sheet portion 20a, the side sheet portion 20b, and the roof sheet portion 20c are formed into a single sheet by fixing their ends to each other. However, the lower sheet portion 20a, the side sheet portion 20b, and the roof sheet portion 20c may be formed from a single sheet from the beginning. The material of the curing sheet 20 is merely an example, and is not particularly limited as long as it can prevent the passage of dust generated during maintenance of the bridge girder 10.

[0033] Next, a method for fixing each of the sheet portions 20a, 20b, 20c, and 20d of the protective sheet 20 will be described in detail.

[0034] The lower sheet portion 20a is fixed to the scaffolding body 40 with a tacker or tape while being covered on the upper surface of the scaffolding body 40, and the side sheet portion 20b is fixed by heating the support 41 and the cross member 42 while being covered therewith to be welded to the support 41 and the cross member 42. In addition, the left and right ends of the lower sheet portion 20a and the lower ends of the side sheet portions 20b are welded with the ends overlapping each other, so that no gap is generated between the lower sheet portion 20a and the side sheet portion 20b. In addition, if the scaffolding body 40 itself does not have a gap through which dust can pass between the inside and outside of the working space A2, the lower sheet portion 20a does not need to be welded to the scaffolding body 40. In addition, in this embodiment, the lower sheet portion 20a and the side sheet portion 20b are fixed to the scaffolding body 40, the support 41, and the cross member 42 by being welded, but they may be fixed by a method other than welding, for example, by tape. However, welding is preferred because it prevents gaps from occurring between the lower sheet portion 20a and the side sheet portion 20b, and it makes the lower sheet portion 20a and the side sheet portion 20b less likely to come off the scaffolding main body 40, the support pillars 41, and the cross members 42.

[0035] 1 and 3, the left and right roof sheet parts 20c have their base ends welded to the upper ends of the side sheet parts 20b, and their tips wrapped around rod materials 14 arranged in the front-to-rear direction via holders 13 (described later) on the left and right sides of the bridge girder 10, respectively, and welded to the roof sheet parts 20c themselves, thereby covering the upper surface of the scaffolding main body 40. Note that in Fig. 3, in order to make it easier to understand the configuration of the holder 13, illustration of support beams 15 and scaffolding boards 16 (described later) is omitted.

[0036] In this way, the tip of the roof sheet portion 20c is fixed in a state where it is wrapped around the rod material 14, so that even if the roof sheet portion 20c is blown by the wind, the roof sheet portion 20c can be prevented from coming off the rod material 14. However, if the mounting strength of the roof sheet portion 20c to the rod material 14 is sufficiently ensured, the tip of the roof sheet portion 20c may be fixed without being wrapped around the rod material 14. Note that, although the base end and tip of the roof sheet portion 20c are fixed to the rod material 14 and the side sheet portion 20b, respectively, by welding, they may also be fixed by a method other than welding, for example, by tape.

[0037] Next, each upper sheet portion 20d stretched between the sleepers 30, 30 is stretched between adjacent sleepers 30 via a plurality of sheet mounting fixtures 12 that are detachably attached to each sleeper 30, as shown in Fig. 4. A plurality of sheet mounting fixtures 12 are provided along the axial direction of each sleeper 30.

[0038] Specifically, as shown in FIG. 4, the sheet mounting device 12 of this embodiment comprises a pair of holding pieces 12a, 12a that hold the sleeper 30 by sandwiching it in the front-to-rear direction, connecting fittings 12b consisting of bolts 12b1 and nuts 12b2 that connect the upper ends and lower ends of the pair of holding pieces 12a, 12a, respectively, and a fixing portion 12c that is provided at a portion of each holding piece 12a facing the sleeper 30 in the front-to-rear direction and is capable of sandwiching and fixing the upper sheet portion 20d.

[0039] As shown in Figure 4, the holding piece 12a has a holding piece main body 12a1 that is approximately U-shaped and clamps the upper and lower ends of the sleeper 30 from the front and rear directions, an upper connecting piece 12a2 that is flat, extends upward from the upper end of the holding piece main body 12a1 and has a hole (not shown), and a lower connecting piece 12a3 that is flat, extends downward from the lower end of the holding piece main body 12a1 and has a hole (not shown).

[0040] Then, with the sleeper 30 sandwiched between the pair of holding pieces 12a, 12a from the front-to-rear direction, the bolts 12b1 are inserted into the holes (not shown) of each upper connecting piece 12a2 that face each other in the front-to-rear direction and the holes (not shown) of each lower connecting piece 12a3 that face each other in the front-to-rear direction, and the sheet mounting device 12 is attached to the sleeper 30 by screwing the nuts 12b2 into the threaded portions of the bolts 12b1.

[0041] In addition, the fixing portion 12c includes a flat welded piece 12c1 welded to the portion of the holding piece main body 12a1 facing the sleeper 30 in the front-to-rear direction, an L-shaped piece 12c2 which stands from the upper end of the welded piece 12c1 toward the opposite side to the sleeper and has an upwardly extending tip to form a gap between the holding piece main body 12a1 and has an L-shaped cross-section and a through hole not shown in the figure, a nut 12c3 welded to the side of the sleeper 30 of the L-shaped piece 12c2 and faces the through hole, and a tightening bolt 12c4 screwed into the nut 12c3.

[0042] According to this configuration, when the fastening bolt 12c4 is rotated, the tip of the fastening bolt 12c4 moves toward or away from the sleeper 30. Therefore, by rotating the fastening bolt 12c4 in the fastening direction with the upper sheet portion 20d inserted between the tip of the fastening bolt 12c4 and the holding piece main body 12a1, the upper sheet portion 20d can be clamped and fixed between the fastening bolt 12c4 and the holding piece main body 12a1.

[0043] Therefore, as shown in Figure 4, by clamping and fixing both the front and rear ends of the upper sheet portion 20d between the holding piece main body 12a1 by the tightening bolts 12c4 of the sheet mounting fixtures 12 provided on each of the adjacent sleepers 30, 30, the upper sheet portion 20d is extended between the adjacent sleepers 30, 30, covering the upper surface of the bridge girder 10.

[0044] Normally, the sleepers 30 do not have any parts where the sheet can be fixed, so it is difficult to spread the upper sheet portion 20d covering the upper surface of the bridge girder 10 between the sleepers 30, 30; however, by attaching sheet mounting fixtures 12 to each sleeper 30 in this manner, which can fix the front and rear side ends, which are the sleeper 30 side ends, of the upper sheet portion 20d, the upper sheet portion 20d can be easily spread between the sleepers 30, 30, and the upper surface of the bridge girder 10 can be covered with the upper sheet portion 20d.

[0045] The above-mentioned configuration of the sheet mounting fixture 12 is one example, and the configuration of the sheet mounting fixture 12 is not particularly limited as long as it can be attached to the sleeper 30 and fix the sleeper 30 side end of the upper sheet portion 20d. Also, the upper sheet portion 20d may be fixed to the sleeper 30 by something other than the sheet mounting fixture 12, for example, a tape.

[0046] As shown in FIG. 3, the ends of the upper sheet portions 20d stretched between the sleepers 30, 30 are fixed to the upper surface of the roof sheet portion 20c fixed to the rod material 14 by welding.

[0047] In this manner, in this embodiment, the ends of the multiple upper sheet parts 20d can be fixed to the roof sheet part 20c that is fixed to the rod material 14, which facilitates the work of fixing the ends of the upper sheet parts 20d to the roof sheet part 20c. This reduces the effort required for assembling the curing apparatus 2 and shortens the assembly time of the curing apparatus 2, which facilitates the installation of the curing apparatus 2 on the bridge girder 10 and the maintenance work for the bridge girder 10.

[0048] The method of fixing the end of the upper sheet portion 20d to the roof sheet portion 20c is not limited to welding, but may be by tape. Although not shown, the gap between the end face of the sleeper 30 and the rod material 14 is covered by a part of the upper sheet portion 20d protruding from between the sleepers 30.

[0049] Also, although not shown, at the front and rear ends of the bridge girder 10, the front sheet portion and the rear sheet portion are welded to the lower sheet portion 20a, the side sheet portion 20b, the roof sheet portion 20c, and the upper sheet portion 20d, respectively, and the front and rear ends of the curing sheet 20 are closed by the front sheet portion and the rear sheet portion.

[0050] In the curing device 2 configured in this manner, a work space A2 is formed inside the lower sheet portion 20a, the side sheet portion 20b, the roof sheet portion 20c, the upper sheet portion 20d, and the front sheet portion and rear sheet portion (not shown) of the curing sheet 20. Therefore, a worker can perform maintenance on the side and underside of the bridge girder 10 from the suspended scaffolding 4 inside the work space A2, and can prevent dust from leaking out of the work space A2 even if blasting work is performed during maintenance.

[0051] Next, the holder 13 used to install the rod material 14 arranged on the side of the bridge girder 10 will be described in detail.

[0052] As shown in Fig. 5, the holder 13 of this embodiment includes a connecting portion 13a that can be detachably connected to the end of the sleeper 30, a clamp holding portion 13b that faces the end face of the end of the sleeper 30, and a clamp portion 13c that is provided on the clamp holding portion 13b and can hold the rod material 14. In Fig. 5, in order to make the structure of the holder 13 easier to understand, configurations other than the holder 13 that is attached to the sleeper 30 are not shown.

[0053] Specifically, the connecting portion 13a comprises a flat upper piece 13a1 extending in the front-to-rear direction along the top surface of the sleeper 30, a pair of side pieces 13a2, 13a2 extending downward from the front and rear ends of the upper piece 13a1 along the front and rear surfaces of the sleeper 30, respectively, with their lower ends protruding downward below the lower end of the sleeper 30, a pair of lower pieces 13a3, 13a3 extending horizontally from the lower ends of the pair of side pieces 13a2, 13a2 in a direction approaching each other and having a gap between their tips, nuts 13a4 welded to the side of the sleeper 30 of each lower piece 13a3 so as to face a through hole not shown in each lower piece 13a3, and a bolt 13a5 inserted into the through hole not shown in the figure and screwed into the nut 13a4 so that its tip faces toward the sleeper 30. Then, when each bolt 13a5 is screwed into the nut 13a4, the sleeper 30 is clamped between the upper piece 13a1 and the bolt 13a5, and the connecting portion 13a is connected to the sleeper 30.

[0054] Next, the clamp holding portion 13b includes a horizontal piece 13b1 extending horizontally along the upper surface of the sleeper 30 from the center of the upper piece 13a1 of the connecting portion 13a to one end in the axial direction of the sleeper 30 (the lower end in the center of FIG. 5(C)), and a vertical piece 13b2 extending vertically downward from the tip of the horizontal piece 13b1 along the end face of the sleeper 30 to near the center of the sleeper 30. Then, a clamp portion 13c capable of holding the rod material 14 is provided on the opposite side of the vertical piece 13b2 to the sleeper.

[0055] The holders 13 thus configured are attached to both the left and right ends of every few sleepers 30 among a plurality of sleepers 30 arranged in the extension direction of the bridge girder 10, as shown in Fig. 6. By attaching the rod material 14 to the clamp portion 13c of each holder 13 installed on the left side of the sleeper 30 in this manner, and also attaching the rod material 14 to the clamp portion 13c of each holder 13 installed on the right side of the sleeper 30, the rod material 14 is installed at intervals on both the left and right sides of the bridge girder 10. The holders 13 may be installed on all sleepers 30, or any sleeper 30 can be selected as long as it is capable of holding the rod material 14.

[0056] However, the above-mentioned configuration of the holder 13 is one example, and the configuration of the holder 13 is not particularly limited as long as the rod material 14 can be arranged in the front-to-rear direction on the side of the bridge girder 10. Also, in this embodiment, the holder 13 that holds the rod material 14 is attached to the sleeper 30, but the holder that holds the rod material 14 may be attached to a part other than the sleeper 30, for example, to the bridge girder 10.

[0057] Furthermore, in this embodiment, as shown in Figures 1 and 6, a plurality of support beams 15 are provided, each end of which is connected to the rod material 14 and cross material 42 on the right side in Figure 1 and arranged in a row at a predetermined interval along the fore-and-aft direction, and a scaffolding board 16 is placed across the support beams 15, thereby setting up a temporary scaffolding S on the right side of the bridge girder 10 in Figure 1.

[0058] In this way, the rod materials 14 arranged on the sides of the bridge girder 10 can be used not only to attach the roof sheet portion 20c, but also to set up the temporary scaffolding S. Furthermore, with the curing device 2 configured in this way, the temporary scaffolding S can be easily set up by simply placing the scaffolding boards 16 across a plurality of support beams 15, each end of which is connected to the rod materials 14 arranged on the sides of the bridge girder 10 and the horizontal members 42 of the suspended scaffolding 4.

[0059] Furthermore, when such a temporary scaffolding S is installed to the side of the bridge girder 10, workers can work not only on the bridge sidewalk 11 but also on the temporary scaffolding S when performing maintenance work on the upper part of the bridge girder 10, so a large work space can be secured. Therefore, maintenance work on the bridge girder 10 can be performed efficiently.

[0060] In this embodiment, the support beam 15 is disposed below the rod material 14, but it may be disposed above the rod material 14.

[0061] In addition, in this embodiment, the roof sheet portion 20c of the curing sheet 20 is disposed between the support beam 15 and the scaffolding board 16, but it may be disposed on the scaffolding board 16. If the bridge side walkway 11 is sufficient for the movement space of the workers, the temporary scaffolding S does not need to be installed.

[0062] In addition, for railway bridges that do not have bridge side walkways 11, temporary scaffolding S of a similar structure to that described above can be installed on both the left and right sides of the bridge girder 10.

[0063] Although the rod material 14 in the present embodiment is cylindrical and made of a metal pipe material, the material and shape of the rod material 14 are not particularly limited as long as the necessary strength can be ensured. For example, the rod material 14 may be solid or rectangular.

[0064] Next, the simple work booth 1 that is installed on the bridge girder 10 and forms a work space A1 where a worker performs maintenance on the top surface of the bridge girder 10 will be described in detail.

[0065] As shown in Figures 1 and 2, the simple work booth 1 of this embodiment has a framework structure 50 that can be installed on rails 31, and a protective sheet 51 that is placed over the framework structure 50 and covers the four lateral sides (front, back, left and right) of the framework structure 50, and serves as a roof that covers the upper part of the periphery, and is provided with a shielding section 5 that forms a work space A1 on the inside.

[0066] As shown in Figs. 1 and 2, the simple work booth 1 is installed to cover the opening O facing the upper surface of the bridge girder 10, which is formed by cutting out a part of the upper sheet part 20d as a curing part covering the upper surface of the bridge girder 10 between the sleepers 30, 30, so that the worker can perform maintenance of the upper surface of the bridge girder 10 through the opening O in the work space A1. Then, the work space A1 with a sufficient height in the vertical direction is formed above the opening O, so that the worker can perform maintenance work on the upper surface of the bridge girder 10 in a comfortable position without being forced into an uncomfortable position such as lying on his / her stomach, and therefore the maintenance work becomes easier and the maintenance work time can be shortened. Furthermore, since the work space A1 is covered with a curing sheet 51 that does not allow dust to pass through, it is possible to prevent dust from scattering outside the work space A1 even when blasting is performed. In this embodiment, the curing sheet 51 is a polyethylene sheet, but the material of the curing sheet 51 is not particularly limited as long as it can prevent the passage of dust generated during maintenance of the bridge girder 10.

[0067] 7, the frame structure 50 of this embodiment includes a rectangular frame body 50a that is long in the front-rear direction and can be installed on the rails 31, six pillars 50b that stand vertically from each corner of the frame body 50a and the axial center of each long side 50a1 of the frame body 50a, and a roof frame 50c that is bridged between the upper ends of the pillars 50b, 50b. The shape of the frame body 50a is not limited to a rectangle and may be any shape as long as an area in which workers can work is secured, and may be, for example, a square.

[0068] The length of each support pillar 50b is set to a length that allows a worker to stand in the work space A1. For example, if the length of each support pillar 50b is set to about 140 to 150 cm, the height of the work space A1 will be a height at which a worker can stand and walk. The number of support pillars 50b provided between each front support pillar 50b and each rear support pillar 50b can be changed appropriately according to the length of the long side 50a1 along the front-rear direction of the frame body 50a.

[0069] Each part of the framework structure 50 will be described in detail below. The width of the short side 50a2 along the left-right direction of the frame body 50a is set to be longer than the width between the rails 31, 31 and shorter than the left-right width of the sleeper 30. The frame body 50a is also provided with a pair of front and rear wheel holding frames 50e that are bridged between the respective long sides 50a1, 50a1 near the respective short sides 50a2 sides, extend parallel to the short sides 50a2, and are provided with wheels 52 described later, a pair of left and right first reinforcing beams 50f, 50f that are bridged between the wheel holding frames 50e, 50e, and a second reinforcing beam 50g that is bridged between the axial center of the wheel holding frame 50e and the axial center of the short side 50a2.

[0070] In this way, by providing the wheel holding frame 50e, the first reinforcing beam 50f, and the second reinforcing beam 50g on the frame body 50a, the rigidity of the floor surface of the framework structure 50 is increased. However, if the rigidity of the floor surface of the framework structure 50 is sufficient, the wheel holding frame 50e, the first reinforcing beam 50f, and the second reinforcing beam 50g may be omitted. In addition, the width between the pair of first reinforcing beams 50f, 50f is set to a length that allows a worker to perform maintenance work while standing between the first reinforcing beams 50f, 50f.

[0071] 7, when the left side is the front and the right side is the rear, a reinforcing frame 50h is provided between the front pillar 50b and the central pillar 50b among the three pillars 50b adjacent in the front-rear direction standing up from each long side 50a1 of the frame body 50a. The reinforcing frame 50h is composed of a pair of upper and lower horizontal beams 50h1, 50h1 respectively spanning between the upper ends and the center of the front pillar 50b and the central pillar 50b, and a pair of front and rear vertical beams 50h2, 50h2 spanning between the horizontal beams 50h1, 50h1.

[0072] As shown in FIG. 7, among the three adjacent pillars 50b in the front-to-rear direction that stand up from each long side 50a1 of the frame body 50a, a reinforcing beam 50i is respectively disposed between the upper ends of the central pillar 50b and the rear pillar 50b.

[0073] In this way, when the reinforcing frame 50h and the beams 50i are bridged between the adjacent supports 50b, 50b in the front-rear direction, a rectangular frame is formed on the left and right side surfaces of the framework structure 50, thereby increasing the rigidity of the sides of the framework structure 50. The front-rear positions of the reinforcing frame 50h and the reinforcing beams 50i may be interchanged.

[0074] Furthermore, depending on the strength required for the framework structure 50, reinforcing frames 50h may be provided instead of the reinforcing beams 50i to increase the rigidity of the side walls of the framework structure 50, or reinforcing beams 50i may be provided instead of the reinforcing frames 50h to reduce the weight of the framework structure 50. Furthermore, if the strength of the framework structure 50 is sufficient, the reinforcing frames 50h and reinforcing beams 50i may be eliminated.

[0075] As shown in Figure 7, the roof frame 50c is configured in a sun-shape and includes first beams 50c1 that are respectively spanned between the upper ends of adjacent pillars 50b, 50b in the left-right direction and are longer than the short sides 50a2 of the frame body 50a, with each end protruding left-right beyond the left and right ends of the sleepers 30, and second beams 50c2 that extend along the front-to-rear direction and connect the left ends and right ends of each first beam 50b1, respectively.

[0076] Because the first beams 50c1 of the roof frame 50c protrude laterally beyond the left and right ends of the sleepers 30 in this way, when the protective sheet 51 is placed over the framework structure 50, as shown in Figure 1, the left and right ends of the protective sheet 51 are positioned on the opposite side of the rail in the left and right direction from the left and right ends of the sleepers 30. Therefore, the work space A1 formed inside the protective sheet 51 can be made wider than when the length of the first beams 50c1 of the roof frame 50c is the same as the length of the short sides 50a2 of the frame body 50a.

[0077] However, if the working space A1 is sufficiently large, the length of the first beam 50c1 of the roof frame 50c may be set to be the same as the length of the short side 50a2 of the frame body 50a. Note that the above-mentioned configuration of the framework structure 50 is merely an example, and is not limited to the above configuration. For example, the framework structure 50 may be configured in a dome shape.

[0078] Furthermore, in the frame structure 50 of this embodiment, as shown in FIG. 7, brace materials (not shown) are provided between each support column 50b and each first beam member 50c1 to improve strength.

[0079] Further, a pair of wheels 52 that are arranged side by side on the left and right and can run on a pair of rails 31, 31 are rotatably attached to each wheel holding frame 50e via forks 53. Therefore, in the framework structure 50 of this embodiment, wheels 52 are provided at four positions on the front, rear, left and right sides of the lower part of the frame body 50a, so that the framework structure 50 can move by running on the rails 31. Note that, if the track 3 is a double track having two pairs of rails 31, 31 for the up line and the down line, the wheels 52 may run on the pair of rails 31, 31 that are arranged on the outer side of each of the rails 31 for the up line and the down line.

[0080] As shown in FIG. 8, the fork 53 has a flat plate 53a connected to the wheel holding frame 50e which is the lower part of the shielding part 5, and a fork body 53b which extends downward from the plate 53a in two directions, is made of an insulating material, and holds the wheel 52 rotatably.

[0081] Although not shown in detail, the fork body 53b includes a pair of holding plates 53b1, 53b1 extending from the lower part of the plate 53a and facing each other across the center of the plate 53a, a shaft (not shown) that penetrates each holding plate 53b1 and is inserted into a hole provided in the center of the wheel 52 disposed between the pair of holding plates 53b1, 53b1, and a nut (not shown) that is screwed to the tip of the shaft. In this way, the fork body 53b can hold the wheel 52 rotatably around the shaft.

[0082] Although not shown, a device called a track circuit is provided on the railway to detect whether or not a train is present in a block section, which is a specific section on the track 3. Specifically, the track circuit includes a power supply device attached to one end of the block section to supply current to each rail 31, and a relay attached between the rails 31, 31 at the other end of the block section. When no train is present in the block section, the current flowing from the power supply through the rail 31 activates the relay. On the other hand, when a train is present in the block section, the rails 31, 31 are short-circuited by the wheels and axles of the train, and no current flows through the relay, causing the relay to stop operating.

[0083] Therefore, whether or not a train is in the block section can be determined based on the operating state of the track circuit. Therefore, if the rails 31, 31 are short-circuited by something other than a train, a short-circuit accident will occur in which the presence of a train is erroneously detected in the block section.

[0084] In contrast, in the simple work booth 1 of this embodiment, the wheels 52 that come into contact with the rails 31 are made of synthetic resin, which is an insulating material. Therefore, even if the framework structure 50 of the shielding part 5 is installed so as to straddle a pair of rails 31, 31 as shown in Fig. 7, it is possible to prevent the rails 31, 31 from shorting out with each other through the framework structure 50.

[0085] Furthermore, in this embodiment, the plate 53a and the fork body 53b constituting the fork 53 that connects the wheel 52 to the lower part of the wheel holding frame 50e of the framework structure 50 are also all made of synthetic resin, which is an insulating material. Therefore, even if the wheel 52 derails from the rail 31, the rail 31 comes into contact with the plate 53a made of an insulating material, so that a short circuit between the rails 31, 31 can be reliably prevented. In this embodiment, the wheel 52 and the fork 53 are made of an insulating material, but it is sufficient that the wheel 502 and the fork 53 have an insulating part that does not conduct electricity. For example, the wheel 52 may be formed by coating the outside of a metal wheel body with rubber, which is an insulating material, and the rubber may be used as the insulating part. The insulating material forming the wheel 52 and the fork 53 may be other than synthetic resin.

[0086] In this embodiment, the wheels 52 and the forks 53 are made of an insulating material to insulate the electrical connection between the rails 31, 31, but an insulating portion that insulates the electrical connection between the pair of rails may be provided in a part of the shielding portion 5 to prevent a short circuit between the rails 31, 31. For example, even if the entire frame structure 50 or only the frame body 50a is made of an insulating material, a short circuit between the rails 31, 31 can be prevented.

[0087] In this embodiment, the wheels 52 are provided on the wheel holding frame 50e, but they may be provided on the long side 50a1 or the short side 50a2 of the frame body 50a.

[0088] Next, a description will be given of the curing sheet 51 that is placed over the framework structure 50 to cover the upper part and the four lateral sides of the framework structure 50. As shown in Fig. 9, the curing sheet 51 includes a sheet main body 51a formed in a cross shape having a rectangular apex 51a1 that covers the upper part (roof frame 50c) of the framework structure 50 and four rectangular side parts 51a2 that extend downward from each side of the apex 51a1 and cover the front, rear, left and right sides of the framework structure 50, and sheet extension parts 51b, 51c, 51d, and 51e that extend from the ends of each side part 51a2 of the sheet main body 51a and come into contact with the upper surface of the bridge girder 10, the walkway floor 11a of the bridge side walkway 11, and the scaffolding board 16 of the temporary scaffolding S.

[0089] In addition, fasteners 51f are provided between each of the side portions 51a2 of the seat main body 51a. Therefore, when the cross-shaped seat main body 51a with the fasteners 51f open is placed over the frame structure 50 and then all the fasteners 51f are closed, the seat main body 51a becomes box-shaped and the gaps between the side portions 51a2 are closed.

[0090] Also, the sheet body 51a may be formed in a box shape without providing the fasteners 51f, but since it is easier to cover the frame structure 50 with the cross-shaped sheet body 51a than to cover the frame structure 50 with the box-shaped sheet body 51a, the shielding part 5 can be assembled more easily and in a shorter time by providing fasteners 51f between the side parts 51a2 of the sheet body 51a as described above. Also, the top part 51a1 and each side part 51a2 may be connected by fasteners. In this way, the protective sheet 51 can be disassembled, making it easier to transport the protective sheet 51.

[0091] Furthermore, the side portions 51a2 provided at the front and rear of the top portion 51a1 of the seat main body portion 51a are also divided into two parts, left and right, at the center, and these divided parts are connected to each other by an entrance / exit fastener 51g. When the entrance / exit fastener 51g is opened, an entrance for the worker to enter and exit the working space A1 is formed. These fasteners 51f, 51g may be hook-and-loop fasteners.

[0092] Among the four sheet extensions 51b, 51c, 51d, and 51e, the sheet extensions 51b and 51c extending along the front-rear direction have a plurality of slits 51b1 and 51c1 extending along the extension direction. Here, in the front-rear direction of the upper surface of the bridge girder 10, many obstacles such as sleepers 30, rails 31, derailment prevention guards and turnouts (not shown) are provided, but since the sheet extensions 51b and 51c extending along the front-rear direction are provided with a plurality of slits 51b1 and 51c1, the sheet extensions 51b and 51c can avoid the obstacles and land on the bridge girder 10. Therefore, the gap between the sheet extensions 51b and 51c and the upper surface of the bridge girder 10 can be reduced, improving the airtightness of the working space A1.

[0093] Furthermore, the sheet extensions 51b, 51c extending in the front-to-rear direction are laid along the upper surface of the bridge girder 10 as shown in Fig. 2, and the sheet extensions 51d, 51e extending in the left-to-right direction are laid along the walkway floor 11a of the bridge side walkway 11 and the scaffolding boards 16 of the temporary scaffolding S as shown in Fig. 1. Therefore, when the protective sheet 51 is provided with such sheet extensions 51b, 51c, 51d, 51e, the ground contact area of ​​the protective sheet 51 increases, improving the airtightness of the work space A1.

[0094] Furthermore, although not shown, in this embodiment, weights such as sandbags are placed on each of the sheet extensions 51b, 51c, 51d, and 51e to prevent the curing sheet 51 from curling up. However, the means for preventing the curing sheet 51 from curling up is not limited to weights, and for example, the sheet extensions 51b, 51c, 51d, and 51e of the curing sheet 51 may be fixed to the bridge girder 10, the bridge side walkway 11, and the temporary scaffolding S with tape. Also, if the weight of the curing sheet 51 itself is enough to prevent curling up, it is not necessary to place weights on the sheet extensions 51b, 51c, 51d, and 51e.

[0095] Next, a description will be given of a method for maintaining the upper surface of the bridge girder 10 using the simplified work booth 1 of this embodiment. First, before performing maintenance on the upper surface of the bridge girder 10, the curing device 2 described above is installed on the bridge girder 10 to cure the periphery of the bridge girder 10.

[0096] With the periphery of the bridge girder 10 cured, a portion of the portion supporting the track 3 in the upper sheet portion 20d, which serves as the cured portion covering the top surface of the bridge girder 10, is cut out to form an opening O facing the top surface of the bridge girder 10.

[0097] Next, the framework structure 50 is assembled outside the bridge girder 10 in advance, and the wheels 52 are placed on the rails 31 to install the framework structure 50 on the rails 31. Then, the framework structure 50 is pushed to travel on the rails 31 and moved to the position of the opening O. In this way, since the framework structure 50 can move on the rails 31, the framework structure 50 can be easily transported and the movement time of the framework structure 50 can be shortened. The framework structure 50 can also be moved while covered with the curing sheet 51, but in that case, air resistance increases, making it difficult to move. In addition, there is a risk that the curing sheet 51 will come off the framework structure 50 if it is blown by the wind. Therefore, it is preferable to move only the framework structure 50 on the rails 31.

[0098] In this embodiment, the width in the left-right direction of the frame body 50a is smaller than the width in the left-right direction of the sleepers 30. Therefore, when a worker pushes the framework structure 50 to move it on the rails 31, the worker can walk on the left and right sides of the framework structure 50 on the upper surface of the bridge girder 10, the bridge sidewalk 11, or the temporary scaffolding S.

[0099] However, the wheels 52 may be omitted. In that case, the frame structure 50 may be disassembled into parts, carried to the position of the opening O, and assembled on the spot.

[0100] Next, the protective sheet 51 is placed on the framework structure 50, weights are placed on the sheet extensions 51b, 51c, 51d, and 51e of the protective sheet 51, and the simple work booth 1 is placed on the rails 31 facing the opening O.

[0101] Then, the worker performs maintenance on the top surface of the bridge girder 10 seen through the opening O within the work space A1 of the simplified work booth 1 thus installed.

[0102] After the maintenance work is completed, the protective sheet 51 is removed from the framework structure 50, the framework structure 50 is moved outside the bridge girder 10, and then a repair sheet is attached to the upper sheet portion 20d around the opening O by tape or welding, thereby closing the opening O.

[0103] By carrying out such work in sequence from one end to the other end in the fore-and-aft direction of the bridge girder 10, the entire top surface of the bridge girder 10 can be maintained.

[0104] Furthermore, work can only be done on the top surface of the bridge girder 10 when trains are not running, but with this method, the framework structure 50 of the simple work booth 1 can be moved on the rails 31 with wheels 52, so the simple work booth 1 can be quickly set up and removed. This ensures time that can be used for maintenance work on the top surface of the bridge girder 10.

[0105] In this embodiment, the railway bridge is described as having a so-called upper deck girder structure in which the track 3 is installed on the bridge girder 10, but the railway bridge may have a so-called middle deck girder structure or lower deck girder structure. Specifically, as shown in FIG. 10, the middle deck girder structure includes a pair of left and right main girders 100, 100 extending along the front-rear direction, a plurality of cross beams 101 that connect the upper and lower middles of the pair of main girders 100, 100 and are arranged at a predetermined interval in the front-rear direction, and a pair of left and right vertical beams 102 that are spanned between the cross beams 101, 101 adjacent to each other in the front-rear direction, and the track 3 is installed on the vertical beams 102. Although not shown, the lower deck girder structure differs from the middle deck girder structure only in that the cross beam 101 connects the lower ends of the pair of main girders 100, 100.

[0106] When a railway bridge is constructed with a middle girder structure or a lower girder structure in this way, maintenance is required not only for the vertical girders 102 and cross girders 101 that directly support the track 3, but also for the top surface of the main girder 100 that supports the track 3 via the vertical girders 102 and cross girders 101.

[0107] Therefore, when the railway bridge is to have a middle girder structure or a lower girder structure, as shown in Figure 10, a guide frame 54 may be provided having upper guide portions 54a extending horizontally from the left and right ends of the roof frame 50c of the framework structure 50 toward the main girder 100, and side guide portions 54b extending downward from the tips of the upper guide portions 54a with their lower ends facing the bridge sidewalk 11 or temporary scaffolding S adjacent to the main girder 100.

[0108] By providing such a guide frame 54, when the protective sheet 51 is placed over the framework structure 50, the protective sheet 51 conforms to the guide frame 54, so that the main girder 100 can be reliably covered with the protective sheet 51.

[0109] Furthermore, when the bridge girder 10 has a middle girder structure or a lower girder structure, since there is a gap between a pair of vertical girders 102, 102, it is not possible to prevent the curing sheet 51 from curling up by placing weights such as sandbags on the sheet extensions 51b, 51c, which extend along the front-to-rear direction of the curing sheet 51, when the sheet extensions 51b, 51c are laid on the vertical girders 102. Therefore, when the bridge girder 10 has a middle girder structure or a lower girder structure, as shown in Fig. 10, the curing sheet 51 is prevented from curling up by attaching multiple magnets M from above the sheet extensions 51b, 51c of the curing sheet 51 placed over the main girder 100 to the side of the main girder 100 and the connecting beams 103 connecting the main girder 100 and the cross girder 101. In FIG. 10, the inside of the protective sheet 51 is shown as being visible in order to make the internal structure of the shielding portion 5 easier to understand; however, in reality, the inside of the protective sheet 51 cannot be seen from the outside.

[0110] Even when the bridge girder 10 has an intermediate or lower girder structure in this manner, a simple work booth 1 can be installed on the rails 31, just as in the case of an upper girder structure, so that a work space A1 can be formed for performing maintenance on the upper surfaces of the main girder 100, cross girder 101, and vertical girder 102.

[0111] As described above, the simple work booth 1 of this embodiment covers an opening O formed in at least a part of the upper surface of the bridge girder 10 supporting the track 3 of the upper sheet portion 20d, which serves as a curing portion covering the upper surface of the bridge girder 10 in a railway bridge having a bridge girder 10 as a steel girder member supporting a track 3 having a pair of rails 31, 31, to form a work space A1 inside, and is provided with a shielding portion 5 that can be installed on the rail 31 facing the opening O, surrounds the periphery of the opening O and has an outer periphery covering all four lateral sides and a roof portion covering the upper part of the outer periphery, forming a work space A1 inside.

[0112] According to the simplified work booth 1 configured in this manner, when the shielding part 5 is installed on the rails 31 facing the opening part O, a work space A1 covered by the outer periphery and roof part of the shielding part 5 is formed above the opening part O. Therefore, by performing maintenance on the top surface of the bridge girder 10 through the opening part O within the work space A1, scattering of dust caused by blasting work can be prevented, and the maintenance work can be performed in a natural position without forcing the worker to take an uncomfortable position such as lying on his / her stomach, thereby shortening the maintenance work time.

[0113] In addition, when the railway bridge has a center girder structure or a through girder structure, the vertical beams 102 supporting the track 3 may be regarded as girder members in the present invention.

[0114] In addition, in the simple work booth 1 of this embodiment, the shielding section 5 has a framework structure 50 that can be installed on the rails 31 and includes a frame body 50a that surrounds the opening O, a plurality of pillars 50b that stand off from the frame body 50a, and a roof frame 50c that is suspended between the upper ends of the pillars 50b, and a protective sheet 51 that is placed over the framework structure 50 to cover the upper part and all four sides of the framework structure 50.

[0115] According to the simple work booth 1 configured in this manner, the opening O is covered with the protective sheet 51, so the weight of the simple work booth 1 can be reduced. This makes it easier to transport the simple work booth 1. This reduces the time required to set up the simple work booth 1, ensuring time for maintenance work on the top surface of the bridge girder 10.

[0116] In this embodiment, the outer periphery covering the four lateral sides of the shielding section 5 and the roof section covering the upper part of the outer periphery are constructed from a protective sheet 51, but the outer periphery and roof section covering the opening O may also be formed from something other than the protective sheet 51, for example, multiple panel members.

[0117] Moreover, the simple work booth 1 of this embodiment is provided with wheels 52 that are provided at least in four locations on the front, back, left and right sides of the lower part of the shielding portion 5 and can run on the rails 31. According to the simple work booth 1 configured in this manner, the simple work booth 1 can move by running on the rails 31, making it easy to transport the simple work booth 1 and shortening the time it takes to move the simple work booth 1. Therefore, the time it takes to set up the simple work booth 1 can be shortened, ensuring time for maintenance work on the top surface of the bridge girder 10.

[0118] However, the wheels 52 may be omitted, in which case the simple work booth 1 can be disassembled and carried to the opening O, and the simple work booth 1 can be assembled on the spot.

[0119] In addition, the simple work booth 1 of this embodiment is equipped with a fork 53 that connects the wheels 52 to the shielding portion 5, and the fork 53 has a plate 53a that is connected to the wheel holding frame 50e, which is the lower part of the shielding portion 5, and a fork body 53b that extends in two directions from the lower end of the plate 53a and holds the wheels 52 rotatably, and the wheels 52 and the fork 53 have insulating parts that do not conduct electricity.

[0120] According to the simple work booth 1 configured in this manner, the wheels 52 in contact with the rails 31 have insulating parts that do not conduct electricity, so that it is possible to prevent the rails 31, 31 from shorting out through the shielding parts 5. Furthermore, according to this configuration, even if the wheels 52 derail from the rails 31, the rails 31 come into contact with the plate 53a provided below the shielding parts 5 and having insulating parts, so that it is possible to prevent the rails 31, 31 from shorting out.

[0121] In this embodiment, the wheels 52 and the forks 53 are made of an insulating material to prevent a short circuit between the rails 31, 31, but the shielding part 5 installed to straddle the pair of rails 31, 31 may be provided with an insulating part that insulates the electrical connection between the pair of rails 31, 31. With the simplified work booth 1 configured in this manner, the rails 31, 31 can be prevented from being short circuited through the shielding part 5.

[0122] In addition, in the simple work booth 1 of this embodiment, the protective sheet 51, when placed over the framework structure 50, has a sheet main body portion 51a that covers the upper part and all four sides of the framework structure 50, and sheet extension portions 51b, 51c, 51d, and 51e that extend from the ends of each of the four sides of the sheet main body portion 51a.

[0123] In the simplified work booth 1 configured in this manner, the sheet extensions 51b, 51c, 51d, and 51e are laid along the upper surface of the bridge girder 10, the bridge side walkway 11, and the temporary scaffolding S, increasing the ground contact area of ​​the protective sheet 51, improving the airtightness of the work space A1 and more reliably preventing dust leakage from within the work space A1. Furthermore, the protective sheet 51 can be prevented from curling up in a variety of ways, such as placing weights such as sandbags on the sheet extensions 51b, 51c, 51d, and 51e, or fastening the sheet extensions 51b, 51c, 51d, and 51e with tape.

[0124] However, the protective sheet 51 may not include the sheet extensions 51b, 51c, 51d, and 51e, and the sheet main body 51a of the protective sheet 51 may be fixed to the upper surface of the bridge girder 10 with tape, for example.

[0125] In addition, in the simple work booth 1 of this embodiment, of the multiple sheet extension portions 51b, 51c, 51d, and 51e, at least the sheet extension portions 51b, 51c extending along the longitudinal direction (front-to-back direction) of the bridge girder 10 have multiple slits 51b1, 51c1 extending along the extension direction.

[0126] In the front-to-rear direction of the upper surface of the bridge girder 10, many obstacles are provided, such as sleepers 30, rails 31, derailment prevention guards and switches (not shown), but according to the simplified work booth 1 configured in this manner, since multiple slits 51b1, 51c1 are provided in the sheet extensions 51b, 51c extending along the front-to-rear direction, the sheet extensions 51b, 51c can avoid the obstacles and touch the ground on the bridge girder 10. Therefore, the gap generated between the sheet extensions 51b, 51c and the upper surface of the bridge girder 10 can be reduced, improving the airtightness of the work space A1.

[0127] In this embodiment, the slits 51b1 and 51c1 are provided only in the seat extensions 51b and 51c extending along the front-rear direction, but the seat extensions 51d and 51e extending along the left-right direction may also be provided with slits. In this case, the seat extensions 51d and 51e extending along the left-right direction can also avoid obstacles, improving the airtightness of the working space A1. However, the slits 51b1 and 51c1 may be omitted.

[0128] Although the preferred embodiment of the present invention has been described in detail above, modifications, variations and changes can be made without departing from the scope of the appended claims. [Explanation of symbols]

[0129] 1 simple work booth, 31 rail, 3 track, 10 bridge girder (beam member), 102 vertical girder (beam member), O opening, A1 work space, 5 shielding section, 50 framework, 50a frame, 50b support, 50c roof frame, 51 protective sheet, 52 wheels, 53 fork, 53a plate, 53b fork body, 51a sheet body, 51b, 51c, 51d, 51e sheet extension, 51b1, 51c1 slits

Claims

1. A simple work booth is provided for covering an opening formed in at least a part of a portion of the upper surface of a steel girder member supporting a track having a pair of rails in a railway bridge, the opening being formed in the upper surface of the girder member and supporting the track, and forming a work space therein, A shielding section is provided which can be installed on the rail facing the opening, surrounds the opening, and has an outer periphery covering all four sides in the lateral direction and a roof covering an upper portion of the outer periphery, forming the work space inside. A simplified work booth characterized by the above.

2. The shielding section includes a framework structure including a frame body that can be installed on the rail and that surrounds the periphery of the opening, a plurality of posts that stand from the framework body, and a roof frame that is spanned between the upper ends of the posts, and a curing sheet that is placed over the framework structure to cover the upper portion of the framework structure and the four sides.

2. The simplified work booth according to claim 1.

3. Wheels are provided at least at four locations on the lower part of the shielding part, front, rear, left and right, and are capable of running on the rails.

2. The simplified work booth according to claim 1.

4. The shielding portion is disposed across the pair of rails and has an insulating portion that insulates the pair of rails from each other in electrical connection.

2. The simplified work booth according to claim 1.

5. a fork for connecting the wheel to the shielding portion; The fork has a plate connected to a lower part of the shielding part, and a fork body extending from the plate in two directions to rotatably hold the wheel, The wheels and the connecting members have insulating parts that do not conduct electricity.

4. The simplified work booth according to claim 3.

6. The curing sheet has a sheet main body portion that covers the upper part and the four sides of the framework structure when it is placed over the framework structure, and sheet extension portions that extend from the ends of the sheet main body portion on each of the four directions.

3. The simplified work booth according to claim 2.

7. Among the plurality of sheet extensions, at least the sheet extension extending along the longitudinal direction of the beam member has a plurality of slits extending along the extension direction.

7. The simplified work booth according to claim 6.

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