On-rail mobile scaffolding device and its assembly method

Abstract

To provide an on-track mobile scaffolding device that can be worked within construction limits, can be assembled and disassembled safely and efficiently, and can be worked efficiently in short work intervals between track closures and power supply cutoffs. [Solution] The device comprises a base unit that can move on a track, a pair of telescopic units that are detachably installed on the base unit, a working floor unit that is detachably attached to the upper ends of the telescopic units, and a connection part that connects the working floor units to each other and links the telescopic units to form a foothold for the working floor units, The telescopic units each include: When extended, it forms a support body and has a ladder-like folding frame that can be bent and stretched freely in two in a L-shape. an upper frame, a middle frame, and a lower frame, which are frame bodies; The track-mounted mobile scaffolding device is equipped with the above.

Description

[Technical Field]

[0001] The present invention relates to an on-track mobile scaffolding device that functions as a work scaffolding for repairing an overpass by moving it on a track on which trains can run, and a method for assembling the same. [Background technology]

[0002] Previously, methods for repairing overpasses that are suspended above tracks on which trains run were broadly limited to three patterns: construction using suspended scaffolding made of lightweight FRP (insulating) pipes, construction using a road-rail vehicle, and construction using frame scaffolding or wedge-type scaffolding (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7307445 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the construction method of using frame scaffolding or wedge-type scaffolding, the installation work exceeds the building clearance, which is the dimensional limit for the position of buildings and other structures set in the space above the tracks so as not to interfere with train operation.As a result, it is necessary to stop the power supply to the overhead lines of nearby tracks, which means there are time constraints for stopping power supply to multiple tracks, i.e., the interval between power outages, and there is a problem that the time available for work is limited.

[0005] In addition, with the road-rail vehicle method, work may not be possible depending on the presence or absence of a road-rail vehicle take-off point, such as a railroad crossing where the road-rail vehicle is to be taken from the road to the tracks, and there is a problem in that if the road-rail vehicle take-off point is far from the work site, the time available for work is shortened.

[0006] Furthermore, with the method using a suspended scaffold as described in Patent Document 1, there are cases where a trolley wire is attached to the overpass, and if the trolley wire is too close to the overpass, the suspended scaffold cannot be installed. Also, assuming that a bird may land on the trolley wire, the distance from the suspended scaffold needs to be at least 40 cm, but there was a problem in that when the suspended scaffold is hung from the overpass, it was unclear whether a sufficient distance could be maintained between the trolley wire and the suspended scaffold. In other words, there was a problem in that the suspended scaffold could only be used in cases where the overpass was installed at a sufficiently high position.

[0007] In other words, none of the above-mentioned conventional methods allows stable work to be performed only within the construction gauge, and there is a problem that they are inefficient construction methods depending on the working conditions.

[0008] The present invention was made in consideration of these problems, and aims to provide an on-track mobile scaffolding device and an assembly method thereof that allows work to be done within the construction gauge, can be assembled and disassembled safely and efficiently, and can be worked on efficiently within the short work intervals between track closures and power cuts. [Means for solving the problem]

[0009] A first aspect of the present invention is an on-track mobile scaffolding device for repairing an overpass, The device comprises a base unit that can move on a track, a pair of telescopic units that are detachably installed on the base unit, a working floor unit that is detachably attached to the upper ends of the telescopic units, and a connecting part that connects the working floor units to each other and links the telescopic units to form a foothold for the working floor units, The telescopic units each include: When extended, it forms a support body and has a ladder-like folding frame that can be bent and stretched freely in two in a L-shape. an upper frame, a middle frame, and a lower frame, which are frame bodies; Equipped with The folding frame is The present invention provides a track-based mobile scaffolding device characterized in that in each of the telescopic units, four units are arranged between the upper end frame and the lower end frame, sandwiching the middle frame, in two tiers stacked one on top of the other, facing both ends of the telescopic unit, and each independently movable.

[0010] According to the first aspect of the present invention, work can be performed within the construction gauge, assembly and disassembly can be performed safely and efficiently, and work can be performed efficiently within short work intervals between track closures and power supply cutoffs.

[0011] Moreover, the folding frames each include: a ladder-shaped upper frame body having an upper frame connecting shaft at its upper end and side girders on both sides; a ladder-shaped lower frame body having a lower end of the lower frame connecting shaft and side girders on both sides; a hinge portion connecting shaft that forms the lower end of the upper frame body and the upper end of the lower frame body, rotatably connecting the upper frame body and the lower frame body to each other and storing the folding frame in half inside the extension unit; and When the folding frame is extended, the upper frame connecting shaft, the lower frame connecting shaft, and the hinge portion connecting shaft constitute a part of the horizontal member of the support body, and the side girder constitutes a part of the support of the support body, The telescopic unit is a lower frame auxiliary damper attached to the lower frame body and adapted to assist the folding frame when the folding frame is extended; a vertical damper auxiliary device provided under the middle frame to assist the middle frame when it rises; and It is preferable that the vertical damper auxiliary device is attached to the top of the lower end frame between the facing lower folding frames and supports the middle frame when the telescopic unit is folded. The scaffolding is lightweight yet strong enough for use as a foothold, and is easy to assemble and disassemble. The telescopic unit alone is easy to carry, reducing the burden on workers.

[0012] Moreover, the telescopic unit is a fixing frame that is detachably attached to the inside of the extension unit when the folding frame is extended and reinforces the extension unit; a locking mechanism that prevents the upper frame body and the lower frame body from over-rotating and maintains a gap between the upper frame body and the lower frame body when the folding frame is folded in half; a handle for manually extending the folding frame; and The base unit is Wheels that can run on rails; A swing frame having a gradient adjustment mechanism that adjusts the height and inclination of the left and right rails; a base plate on which the extension unit can be placed; an outrigger for fixing the base plate; This prevents the folding frame from becoming unstable in the extended state, prevents damage when folding, makes extension even easier with the handle, and provides a stable foothold even on slopes.

[0013] A second aspect of the present invention provides a method for manufacturing a robotic vehicle, comprising: a base installation step of installing the base unit on a track; an extension unit placing step of placing the extension unit on the base unit; a work platform unit mounting step of mounting the work platform unit on the extension unit; an upper extension step of extending the upper folding frame of the telescopic unit; an upper stage fixing step of fixing the upper stage folding frame of the telescopic unit in an extended state; a lower extension step of extending the folding frame of the lower section of the telescopic unit; a lower stage fixing step of fixing the lower stage folding frame of the telescopic unit in an extended state; a connecting step of connecting the pair of telescopic units at the connecting portions and connecting the pair of working platform units at the connecting portions; The present invention provides a method for assembling a track-based mobile scaffolding device, comprising:

[0014] According to the second aspect of the present invention, work can be performed within the construction gauge, assembly and disassembly can be performed safely and efficiently, and work can be performed efficiently within the short work intervals between track closures and power supply cutoffs.

[0015] Furthermore, the upper extension step and the lower extension step each include: a handle attachment step of attaching the handle to a lower frame connecting shaft of the folding frame to be extended; When the handle is pushed down, the handle and the lower frame Ren The lower frame is connected to the shaft by the shaft connection part. Ren a connecting shaft rotating to push up the hinge portion connecting shaft of the folding frame, thereby extending the folding frame; It is preferable that the folding frame be pushed down by hand rather than up, since it is easier to apply force when pushing down than up. [Effects of the Invention]

[0016] According to the present invention, work can be performed within the construction gauge, assembly and disassembly can be performed safely and efficiently, and work can be performed efficiently within the short work intervals between track closures and power supply cutoffs. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic front view of a track-based mobile scaffolding device according to a first embodiment of the present invention (two rows perpendicular to the rails). [Figure 2] FIG. 1 is a schematic left side view of a track-mounted mobile scaffolding device according to a first embodiment of the present invention (two rows overlapping parallel to the rails). [Figure 3] 1 is a schematic top view of a track-based mobile scaffolding device according to a first embodiment of the present invention. [Figure 4] 1 is an enlarged view (front) of the lower part of the on-rail mobile scaffolding device according to Example 1 of the present invention. [Figure 5] 1 is an enlarged view (left side view) of the lower part of the on-rail mobile scaffolding device according to Example 1 of the present invention. [Figure 6] 1 is a partially enlarged view (left side view) of the on-rail mobile scaffolding device according to the first embodiment of the present invention when the extension unit is folded. [Figure 7] 1 is a partially enlarged view (front view) of an extension unit of an on-rail mobile scaffolding device according to a first embodiment of the present invention. [Figure 8] 1 is a partial enlarged view (left side view) of an extension unit of an on-rail mobile scaffolding device according to a first embodiment of the present invention. [Figure 9] 1 is a schematic view (enlarged perspective view) of a main part of an on-rail mobile scaffolding device according to a first embodiment of the present invention. [Figure 10] 1 is a perspective schematic view of an on-rail mobile scaffolding device according to a first embodiment of the present invention when folded. [Figure 11] 1 is a schematic diagram showing a fixed frame mounting state of an on-rail mobile scaffolding device according to a first embodiment of the present invention. FIG. [Figure 12] FIG. 2 is a schematic diagram showing the start of extension of the second stage of the on-rail mobile scaffolding device of Example 1 of the present invention. [Figure 13] FIG. 2 is a schematic diagram showing the second stage of the on-rail mobile scaffolding device according to the first embodiment of the present invention in the middle of extension. [Figure 14] FIG. 2 is a schematic diagram showing the fixed frame attachment state after the second stage of the on-rail mobile scaffolding device according to the first embodiment of the present invention has been extended. [Figure 15] 1 is a schematic diagram of a locking mechanism of an on-rail mobile scaffolding device according to a first embodiment of the present invention. [Figure 16] FIG. 2 is an explanatory diagram of a handle attachment portion of the on-rail mobile scaffolding device according to the first embodiment of the present invention. [Figure 17] FIG. 2 is an explanatory diagram showing the relationship between the on-rail mobile scaffolding device of the first embodiment of the present invention and the construction limit when the device is extended to the first stage. [Figure 18] FIG. 10 is an explanatory diagram showing the relationship with the construction limit when the on-rail mobile scaffolding device of the first embodiment of the present invention is extended to the fourth stage. [Figure 19] 1 is an assembly diagram 1 (with an extension unit placed) of the on-rail mobile scaffolding device according to the first embodiment of the present invention. FIG. [Figure 20] FIG. 2 is an assembly diagram 2 of the on-rail mobile scaffolding device according to the first embodiment of the present invention (when the working platform is assembled). [Figure 21]FIG. 3 is an assembly diagram of the on-rail mobile scaffolding device according to the first embodiment of the present invention (at the start of extension of the first stage). DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, preferred embodiments of the present invention will be specifically described using examples with reference to the accompanying drawings regarding the on-rail mobile scaffolding device of the present invention and the method for assembling the on-rail mobile scaffolding device using the same, but the present invention is not limited to these. [Example]

[0019] {composition} FIG. 1 is a schematic front view of an on-track mobile scaffolding device according to a first embodiment of the present invention (two rows perpendicular to the rails). FIG. 2 is a schematic left side view of an on-track mobile scaffolding device according to a first embodiment of the present invention (two rows overlapping parallel to the rails). FIG. 3 is a schematic top view of an on-track mobile scaffolding device according to a first embodiment of the present invention. FIG. 2 is a view from the direction of arrow A in FIG. 1. The on-track mobile scaffolding device 1 of this embodiment is an on-track mobile scaffolding device for repairing an overpass, and comprises a base unit 2 that is movable on a track, a pair of left and right extendable units 4a, 4b that are detachably installed on the base unit 2, a pair of left and right working floor units 5a, 5b that are detachably attached to the upper ends of the extendable units 4a, 4b, respectively, and a connection part 6 that connects the pair of left and right working floor units 5a, 5b to each other and links the extendable units 4a, 4b to form left and right scaffolding. Here, left and right refer to the left and right sides as viewed from the front in Figure 1, with the front side of the paper in Figure 1 being the front side and the back side being the rear side. The front and rear views have almost the same configuration, and the left and right side views have almost the same configuration. In Figure 1, the direction perpendicular to the rail R is the left-right direction. In each figure, common members and parts are given common symbols and their explanations are simplified or omitted. Furthermore, if the figures become too complicated to read, some members or parts shown in other figures will be omitted from some of the figures.

[0020] FIG. 4 is an enlarged view (front) of the lower part of the track-mounted mobile scaffolding device according to the first embodiment of the present invention. FIG. 5 is an enlarged view (left side) of the lower part of the track-mounted mobile scaffolding device according to the first embodiment of the present invention. The base unit 2 includes wheels 21 that can run on the rail R, a swing frame 26 with a gradient adjustment mechanism 24 that adjusts the left and right rail height and inclination, a base plate 23 on which the extension units 4a and 4b can be placed, and outriggers 3 to which the base plate 23 is secured. The gradient adjustment mechanism 24 balances the base plate 23 horizontally and front and rear like a balancer, keeping the base plate 23 horizontal. The front and rear wheels 21 are connected by axles 22 along the rail R. Trolley carts 25 are provided on the wheels 21 at four locations on the left and right sides, and the swing frame 26 is placed on the trolley carts 25. The lower end frame 491 of the extension unit 4 can be placed on the base plate 23.

[0021] FIG. 6 is a partially enlarged view (left side) of the telescopic unit of the track-based mobile scaffolding device according to the first embodiment of the present invention when folded. The telescopic unit 4a includes an upper frame 492, a middle frame 493, and a lower frame 491. The telescopic unit 4a forms a support structure when extended and has a ladder-like folding frame 41 that can be bent and extended in two. The telescopic unit 4b has a configuration symmetrical to the telescopic unit 4a, and will be referred to as the telescopic unit 4 below. More specifically, four folding frames 41a, 41b, 41c, and 41d are stacked vertically between the upper frame 492 and the lower frame 491, with the middle frame 493 sandwiched between them, facing both ends of the telescopic unit 4a and allowing for independent movement. The upper frame 492 can be detachably fitted with a working platform unit 5, and the lower frame 491 can be manually placed on the base unit 2. The four folding frames 41a-d can be extended and retracted separately, left and right, and top and bottom. Therefore, there is no need for coordinated movements when lifting the left and right folding frames, and they can be extended and folded individually at their own timing without breaking or collapsing. This prevents damage or injuries caused by misalignment during assembly and disassembly.

[0022] In this embodiment, folding frames 41a, 41b, 41c, and 41d together form a pair of support columns on the front and rear sides of one telescopic unit when extended. Folding frames 41a and 41c are lower folding frames, and folding frames 41b and 41d are upper folding frames. Folding frames 41a and 41b are located on the front side (right side in FIG. 2), and folding frames 41c and 41d are located on the rear side (left side in FIG. 2). Since folding frames 41a, 41b, 41c, and 41d all have the same basic configuration, they will be described below as folding frame 41 except when distinguishing between the upper and lower frames. When the upper and lower stages are described separately, the upper stage will be described as either folding frame 41b or 41d or the upper folding frame 41, and the lower stage will be described as either folding frame 41a or 41c or the lower folding frame 41.

[0023] The folding frame 41 has a ladder-shaped upper frame body 411 with an upper frame connecting shaft 413 at its upper end and upper side girders 415 on both sides, a ladder-shaped lower frame body 412 with a lower frame connecting shaft 414 at its lower end and lower side girders 416 on both sides, and a hinge portion connecting shaft 419 that forms the lower end of the upper frame body 411 and the upper end of the lower frame body 412, and that connects the upper frame body 411 and the lower frame body 412 so that they can rotate freely with each other and store the folding frame 41 in half inside the extension unit 4. The folding frames 41 are arranged so that when folded, the folding frames 41 are folded in a V-shape toward the inside of the extension unit 4. Since the folding frame 41 does not fold using crossed links like the scissor-type (diagonal bracing type) folding, nor does it fold using multiple diamond-shaped folds that alternately bend three-dimensionally like the bellows-type (accordion-type, bellows-type, bellows-type) folding, the four folding frames 41 do not share hinge axes and can be extended or otherwise operated individually. As will be described in detail later, to prevent the upper frame body 411 and the lower frame body 412 from rotating more than 180 degrees relative to each other via the hinge section connecting axis 419, anti-reversal plates (frame side) 422c, 422b are provided adjacent to each other on the inside of the connecting body when extended, interfering with each other to act as a stopper. Also, to prevent the upper frame body 411 from rotating until it protrudes outward via the upper frame connecting axis 413 via the upper frame connecting axis 413, anti-reversal plates (pillar base side) 476a are provided adjacent to each other on the outside of the connecting body when extended, interfering with each other to act as a stopper. In addition, the lower frame connecting shaft 414 is provided with an anti-reversal plate (on the support base side) 476b that is adjacent to the outside of the connecting body and interferes with each other to act as a stopper when the lower frame connecting shaft 414 is extended so that the upper frame body 411 does not rotate until it protrudes outward from the upper frame connecting shaft 413.

[0024] Figure 7 is a partial enlarged view (front) of the telescopic unit of the track-mounted mobile scaffolding device of Example 1 of the present invention. The side girders, which are the vertical parts on both sides of the ladder, form the framework that supports the entire ladder when it is extended. The upper frame body 411 is provided with one or more upper frame cross members 417 between the parallel upper side girders 415, which, together with the upper frame connecting shaft 413, form the steps of a ladder. Similarly, the lower frame body 412 is provided with one or more lower frame cross members 418 between the parallel lower side girders 416. The hinge connecting shaft 419 corresponds to the movable mechanism, or joint, of a folding ladder.

[0025] When the folding frame is extended, the upper frame connecting shaft 413, the lower frame connecting shaft 414, and the hinge section connecting shaft 419 form part of the horizontal member of the support body, and the side girder (upper) 415 and the side girder (lower) 416 form part of the support of the support body.

[0026] The upper frame 492 has pillar bases 472a attached vertically below its four corners. The middle frame 493 has pillar bases 472c attached vertically below its four corners and pillar bases 472b attached vertically above its four corners. The lower frame 491 has pillar bases 472d attached vertically above its four corners. The lower end of pillar base 472a is connected to the upper frame connecting shaft 413 of the upper tier. The upper end of pillar base 472b is connected to the lower frame connecting shaft 414 of the upper tier. The lower end of pillar base 472c is connected to the upper frame connecting shaft 413 of the lower tier. The upper end of pillar base 472d is connected to the lower frame connecting shaft 414 of the lower tier. The pillar bases 472a, 472b, 472c, and 472d are all connected to the folding frame 41 described above, and together with the folding frame 41 form a pillar body when the folding frame is extended, and will be described as pillar base 472 unless otherwise specified.

[0027] FIG. 8 is a partial enlarged view (left side) of the telescopic unit of the track-based mobile scaffolding device according to the first embodiment of the present invention. The telescopic unit 4 has a lower frame auxiliary damper 433 attached to the lower frame body 412 and assisting in the extension of the folding frame 41. The upper ends of the lower frame auxiliary dampers 433 are connected to the stringer (lower) 416 of the lower frame body 412. The lower end of the upper lower frame auxiliary damper 433 is connected to the middle frame 493, and the lower end of the lower lower frame auxiliary damper 433 is connected to the lower frame 491. In this embodiment, two lower frame auxiliary dampers 433 are provided per folding frame 41 (one on the near side and one on the far side of the page in FIG. 6). The lower frame auxiliary dampers 433 assist in the extension of the telescopic unit 4 by rotating the lower frame body 412. When the lower frame body 412 of the lower stage is raised, the presence of the lower frame auxiliary damper 433 and the damper vertical auxiliary device 431 described later allows the working platform unit 5 to be raised while still resting on the telescopic unit 4.

[0028] Figure 9 is a schematic diagram (enlarged perspective view) of the main parts of the track-mounted mobile scaffolding device of Example 1 of the present invention. For simplicity, Fig. 9 does not show the upper frame connecting shaft 413, the lower frame connecting shaft 414, the hinge connecting shaft 419, the upper frame body cross member 417, the lower frame body cross member 418, the rotation prevention pin plate (frame body side) 421, the inversion prevention plate (frame body side) 422, the rotation prevention pin plate (pillar base side) 475, the inversion prevention plate (pillar base side) 476, etc. The telescopic unit 4 is provided below the middle frame 493 and has a vertical damper auxiliary device 431 that assists when the middle frame 493 is raised. The damper vertical auxiliary device 431 is attached to the top of the lower end frame 491 between the facing lower folding frames 41a, 41c (between the left folding frame 41a and the right folding frame 41c in FIG. 2), and supports the middle frame 493 when the telescopic unit 4 is folded. The damper auxiliary device 431 has arms 434 protruding from the top that support the long sides of the middle frame 493 from below, and when the telescopic unit 4 is folded, the long sides of the middle frame 493 rest on the arms 434, preventing the middle frame 493 from crushing the lower folding frames 41a, 41c.

[0029] When folded, the height from the rail to the lower frame is about 76 cm, the height from the rail to middle frame 493 (when resting on arm 434) is about 1.2 m, and the height from the rail to the upper frame is about 2 m, so that the height is just right for an operator to easily work on extending or retracting upper folding frames 41 b and 41 d while standing. Furthermore, after assembling the upper folding frame, the middle frame can be lifted to slightly extend lower folding frames 41 a and 41 c without bending over, making the work easy.

[0030] The damper vertical support fixture 431 is a box frame type installed on top of the lower frame lying member 494 suspended across the lower frame 491, and connects two vertically installed vertical dampers 432 face to face, with the supports at the four corners forming a nested structure, so that when the vertical dampers 432 are extended, the supports at the four corners extend upward. When the lower frame body 412 of the folding frame 41 is in the folded state, the middle frame 493 rests on the lying member supported by the supports at the four corners of the damper vertical support fixture 431. When the lower frame body 412 is extended, the upper end of the damper vertical support fixture 431 extends upward by the vertical dampers 432, and accordingly the middle frame 493 is pushed upward. After pushing up and supporting the middle frame 493 to a certain height, the middle frame 493 rises solely due to the further extension of the folding frames 41a, 41d, and separates from the upper end of the damper vertical auxiliary device 431. The vertical damper 432 contributes to the assembly of the folding frames 41a, 41d by assisting in pushing up the middle frame 493 when the folding frames 41a, 41d begin to be extended. When the lower folding frames 41a, 41d are folded, the damper vertical auxiliary device 431 supports the middle frame 493. The damper vertical auxiliary device 431 lifts the middle frame 493 while supporting it until the lower folding frame 41 is partway extended, but then separates from the middle frame 493 from partway through extension. This maximizes compactness while significantly reducing the burden on the worker during extension.

[0031] As described above, the damper vertical auxiliary tool 431 assists in the lifting of the middle frame 493 at the lower level. This makes it easy to further lift the working platform unit 5 placed on the telescopic unit 4, and also maintain that state. In this embodiment, the lower frame auxiliary damper 433 and the damper vertical auxiliary tool 431 are air dampers. Since they are always elastically pressed in the extension direction by the built-in air pressure, they are always in an elastically supported state when folding or extending the telescopic unit 4, so the scaffolding will not suddenly fall and can be easily raised and lowered manually.

[0032] Fig. 10 is a perspective schematic diagram of the track-based mobile scaffolding device of Example 1 of the present invention when folded. Fig. 10 is a view from the direction of arrow B in Fig. 1. For simplicity, Fig. 10 does not show the floor material 51, handrail 62, upper frame connecting shaft 413, lower frame connecting shaft 414, hinge connecting shaft 419, upper frame body cross member 417, lower frame body cross member 418, etc. The vertical damper auxiliary part 431 supports the middle frame 493 from below in the extension units 4a and 4b.

[0033] Fig. 11 is a schematic diagram showing the fixed frame attachment state of the track-mounted mobile scaffolding device of Example 1 of the present invention. Fig. 12 is a schematic diagram showing the start of extension of the second stage of the track-mounted mobile scaffolding device of Example 1 of the present invention. Fig. 13 is a schematic diagram showing the second stage of the track-mounted mobile scaffolding device of Example 1 of the present invention in the middle of extension. Fig. 14 is a schematic diagram showing the fixed frame attachment state of the track-mounted mobile scaffolding device of Example 1 of the present invention after extension of the second stage. The extension unit 4 has fixing frames 48a, 48b, 48c, and 48d that are detachably attached inside the extension unit 4 and reinforce the extension unit 4 when folding frames 41a, 41b, 41c, and 41d are extended. The fixed frames 48a, 48b, 48c, and 48d have support columns 481 that are arranged parallel to the side girders 415 and 416 when the folding frames 41a, 41b, 41c, and 41d are extended and support the telescopic units vertically, and horizontal columns 486 that are arranged perpendicular to the side girders 415 and 416 and support the telescopic units horizontally. The fixed frames 48a and 48b are detachably attached to the folding frames 41a and 41c before they are extended. The fixed frames 48c and 48d are inserted into and detachably connected to the telescopic units 4 after the folding frames 41a and 41c are extended. One or more support columns 481 may be located near the center of the horizontal columns 486 that are perpendicular to the support columns 481 and that span the entire telescopic unit 4 from the front to the rear.

[0034] 15 is a schematic diagram of a locking mechanism of the track-based mobile scaffolding device according to the first embodiment of the present invention. The telescopic unit 4 has a locking mechanism that prevents the upper frame body 411 and the lower frame body 412 from over-rotating and maintains a distance between the upper frame body 411 and the lower frame body 412 when the folding frame 41 is folded in half. The locking mechanism includes a rotation prevention pin plate (frame body side) 421, an inversion prevention plate (frame body side) 422, a distance maintaining member 46, a rotation prevention pin plate (support base side) 475, and an inversion prevention plate (support base side) 476. In addition, the hooks 484, hook retaining fittings 483, and mounting protrusions 485 of the fixed frame 48, and the fixed frame mounting holes 451 drilled in the stringer (upper) 415 and the stringer (lower) 416 also function as a locking mechanism.

[0035] The anti-inversion plate (frame body side) 422 is a rectangular flat plate, and both the upper and lower rows are composed of an anti-inversion plate (frame body side) 422a provided at the lower end of the side girder (lower) 416, an anti-inversion plate (frame body side) 422b provided at the upper end of the side girder (lower) 416, an anti-inversion plate (frame body side) 422c provided at the lower end of the side girder (upper) 415, and an anti-inversion plate (frame body side) 422d provided at the upper end of the side girder (upper) 415.

[0036] The anti-inversion plate (pillar base side) 476 is a rectangular flat plate and is composed of an anti-inversion plate (pillar base side) 476a provided at the upper ends of the upright pillar bases 472b and 472d, respectively, and an anti-inversion plate (pillar base side) 476b provided at the lower ends of the hanging pillar bases 472a and 472c, respectively.

[0037] The anti-inversion plates (frame body side) 422a, 422d and the anti-inversion plate (pillar base side) 476 contact each other on one side to act as stoppers so that the side girder (upper) 415 and the side girder (lower) 416 do not bulge outward from the telescopic unit 4 when the folding frame 41 is extended.

[0038] The inversion prevention plates (frame body side) 422b, 422c come into contact with each other on one side when the folding frame 41 is extended, and act as a stopper that prevents the hinge portion connecting shaft 419 from rotating excessively.

[0039] Anti-rotation pin plate (frame body side) 421 is provided at the lower end of stringer (lower) 416, and anti-rotation pin plate (pillar base side) 475 is provided at the upper end of upright pillar bases 472b, 472d. Anti-rotation pin plate (frame body side) 421 and anti-rotation pin plate (pillar base side) 475 both have holes drilled in them, and although they do not overlap when folding frame 41 is folded, they are located in positions where the holes overlap when folding frame 41 is extended, and by inserting an anti-rotation pin with the holes overlapping, folding frame 41 is prevented from returning to the folding direction.

[0040] In this embodiment, a substantially rectangular, flat spacing retainer 46 is attached to the folding frame 41 so that the angle between the upper frame body 411 and the lower frame body 412 is maintained at 19°±5° when the folding frame 41 is folded. The spacing retainer 46 has holes at both longitudinal ends for detachably attaching the ends of the upper frame connecting shaft 413 and the lower frame connecting shaft 414. Before assembly and after disassembly, the overall height of the telescopic unit 4 can be reduced to 1240 mm, approximately one-third of the extended height (3740 mm), making it compact and easier to transport. Furthermore, because the angle between the upper and lower stringers is maintained constant, the stringers are prevented from overlapping and colliding with each other, which could result in breakage, or from overlapping so much that it becomes difficult to push them up by hand.

[0041] 7 and 8, when the folding frame 41 is extended, the hooks 484 of the fixed frame 48 are rotated to hook onto protrusions provided on the inside of the stringer (upper) 415 and the stringer (lower) 416, thereby holding the fixed frame 48. Retaining fittings 483 that connect to the support parts 481 of the fixed frame 48 are connected to the hooks 484. The support parts 481 of the fixed frame 48 are also provided with mounting protrusions 485 for holding the folding frame 41 in an extended state. Furthermore, the stringer (upper) 415 and the stringer (lower) 416 are provided with fixed frame mounting holes 451, and by fitting the mounting protrusions 485 into the fixed frame mounting holes 451 when the folding frame 41 is extended, the shape of the telescopic frame 4 is maintained.

[0042] 16 is an explanatory diagram of a handle attachment portion of the track-mounted mobile scaffolding device according to the first embodiment of the present invention. A handle 44 may be added to manually extend the folding frame 41. As shown in FIGS. 6, 12, and 13, the portion where the handle 44 is attached is under The handle 44 is the end of the frame connecting shaft 414. RenThe folding frame 41 includes a shaft connection part 441 that is detachably attached to the end of the connecting shaft 414, and a handle part 442 that is bent downward relative to the shaft connection part 441 and that can be manually pushed down while connected to the lower frame connecting shaft 414 to extend the folding frame 41. First, when extending the upper folding frame 41, the handle part 442 is connected to the lower frame connecting shaft 414 of the upper tier. After assembling the upper tier, when extending the lower folding frame 41, the handle part 442 is connected to the lower frame connecting shaft 414 of the lower tier. Both the lower and upper tiers have four lower frame connecting shafts 414 (two on the front and left sides of the page and two on the back and right sides of the page in Figure 2), and when using bent rod-shaped handles, it is preferable to connect different handles 44 to all four positions and use all four positions simultaneously during one lift. When using a U-shaped handle connected to the tips of two bent rods, the base ends of the two bent rods may be attached to both ends of the lower frame connecting shaft 414 (the front and back sides of the page in FIG. 6 ), or to one end. Also, if the entire frame is made of lightweight aluminum, four workers can extend the folding frame 41 without the handle 44. By using the handle 44, the principle of leverage makes it easier to set up the scaffold than by directly extending the folding frame 41 by hand. In addition, since the frame is made of aluminum in this embodiment, it is not only lightweight but also rust-resistant, making it excellent for maintenance.

[0043] The handle 44 has a lower frame in the shaft connection part 441. Ren A hole is provided through which the connecting shaft 414 is passed to hold the lower frame in an unrotatable manner. Ren The connecting shaft 414 does not rotate freely, and the lower frame can be moved by turning the handle 44. Ren The connecting shaft 414 also rotates, and when the handle is turned downward, the folding frame 41 rotates upward. However, the upper end of the folding frame 41 does not rotate, so the angle between the lower frame body 412 and the upper frame body 411 gradually increases. RenThe upper frame 492, which is connected via the support base 472 erected on the connecting shaft 413, is raised. Ergonomically, it is easier to push down than to lift up an object, so the folding frame 41 can be extended by pushing down the handle, reducing the burden on the worker. In particular, the upper level is worked on at a higher position than the lower level, so being able to extend it by pushing down is a great advantage.

[0044] 1 and 2 show a state in which the upper and lower frame bodies 411 and 412 are extended and perpendicular to the base unit 2. In this embodiment, the upper frame body 411 is connected to the hinge portion connecting shaft 419 and the upper frame Ren The upper frame body 412 has a plurality of cross members 417 in parallel with the connecting shaft 413, and the lower frame body 412 has a hinge connecting shaft 419 and a lower frame Ren A plurality of lower frame cross members 418 are provided parallel to the connecting shaft 414, forming a ladder-shaped support body that supports the working floor unit 5.

[0045] The work floor unit 5 has floor material 51, handrails 52, handrail supports 53 that support the handrails 52, and baseboards 54 that serve as a frame on which the floor material 51 is placed. The floor material 51 has a honeycomb structure and serves as a platform on which worker H stands to perform overpass repair work. The left and right work floor units 5 have a symmetrical structure and are connected by a connection part 6. The connection part 6 has tie beams 61 that connect the left and right telescopic units 4 between the upper and lower levels, and baseboards 64 and handrails 62 that connect the work floor units 5. The connection part 6 allows the work floor unit 5, which is a work floor, to be set up stably.

[0046] In addition, not only assembly but also disassembly becomes easy.

[0047] FIG. 17 is an explanatory diagram showing the relationship between the track-mounted mobile scaffolding device of Example 1 of the present invention and the construction gauge when extended to the first stage. FIG. 18 is an explanatory diagram showing the relationship between the track-mounted mobile scaffolding device of Example 1 of the present invention and the construction gauge when extended to the fourth stage. According to this example, the amount of power needed to power down the overbridge is minimized, and the construction gauge K of the adjacent line and the influence range E (2 m) of the extra-high voltage overhead line are taken into consideration. The scaffolding is a two-tower type, allowing for avoidance of the overhead lines. Since assembly can be performed without entering the influence range E of the extra-high voltage overhead line of the adjacent overhead line, work can be performed without interrupting power to both the up and down lines, allowing for more time for work. According to this example, even if the adjacent line is energized, construction can be performed regardless of work conditions such as the interval between power outages or the presence or absence of rail-road vehicle detached lines. Therefore, construction can be performed more efficiently in a shorter time. Furthermore, work can be performed even when only the line being worked on is powered down.

[0048] {Assembling method} Fig. 19 is an assembly diagram 1 (when the extension unit is placed) of the track-mounted mobile scaffolding device of Example 1 of the present invention. Fig. 20 is an assembly diagram 2 (when the work platform is assembled) of the track-mounted mobile scaffolding device of Example 1 of the present invention. Fig. 21 is an assembly diagram 3 (when the first stage starts to be extended) of the track-mounted mobile scaffolding device of Example 1 of the present invention. The assembly method of the track-mounted mobile scaffolding device of this example uses the track-mounted mobile scaffolding device 1 of this example. This method is a method for assembling an on-rail mobile scaffold device using an on-rail mobile scaffold device 1, and includes: (a) a base installation step of installing a base unit 2 on the rail; (b) an extension unit installation step of placing an extension unit 4 on the base unit 2; (c) a work floor unit installation step of attaching a work floor unit 5 on the extension unit 4; (d) an upper stage extension step of extending the upper folding frame 41 of the extension unit 4; and (e) an upper stage fixing step of fixing the upper folding frames 41b, 41d of the extension unit 4 in an extended state. The system includes: (f) a lower extension step for extending the lower folding frames 41a, 41c of the extension unit 4; (g) a lower fixing step for fixing the lower folding frames 41a, 41c of the extension unit 4 in an extended state with anti-rotation pins (not shown); (h) an upper fixing step for fixing the lower folding frames 41a, 41c of the extension unit 4 in an extended state; and (i) a connecting step for connecting the pair of left and right extension units at the connecting parts and connecting the pair of left and right working floor units at the connecting parts. The extension unit 4 weighs approximately 77 kg, so when placing the extension unit 4 on the base unit 2, two workers H can lift the extension unit 4 by hand and perform the installation work. When installing the working floor unit 5, the worker stands on a portable workbench placed next to it.

[0049] In this embodiment, the (d) upper extension step and the (f) lower extension step respectively include a (j) handle attachment step for attaching the handle 44 to the lower frame connecting shaft 414 of the folding frame 41 to be extended, and a (k) step for attaching the handle 44 to the lower frame connecting shaft 414 when the handle 44 is pushed down. Ren The lower frame is connected to the shaft connecting portion 441 by the shaft connecting portion 441. Ren The connecting shaft 414 rotates to push up the hinge portion connecting shaft 419 of the folding frame 41, thereby extending the folding frame 41.

[0050] Disassembly is done in the reverse order of assembly, and can be done manually for convenience.

[0051] {effect} According to the on-track mobile scaffolding device and the method for assembling the on-track mobile scaffolding device of this embodiment, it is possible to work within the construction gauge, assembly and disassembly can be done safely and efficiently, and work can be done efficiently within the short work intervals between track closures and power supply cuts.

[0052] According to this embodiment, the height of the telescopic unit 4 when both stages are extended is approximately three times that when both stages are folded. Scaffolding can be easily constructed by extending the upper and lower stages twice. In this embodiment, the height of the telescopic unit 4 when folded is 1240 mm, and the height of the telescopic unit 4 when extended is 3740 mm. Furthermore, the telescopic unit 4 weighs approximately 77 kg, allowing it to be carried by four workers H, making it highly convenient. The first stage will lift approximately 60 kg, and the second stage will lift approximately 100 kg. Air dampers reduce weight during ascent and suppress sudden movement during descent. The second stage is supported vertically by vertical auxiliary devices, allowing four workers H to manually lift both the first and second stages. A work platform with a width of 3400 mm perpendicular to the rails can be constructed, achieving an on-track mobile scaffolding system for overbridge repair that nearly fully meets the construction clearance (3800 mm).

[0053] On curves, centrifugal force tends to push trains toward the outside of the curve, so the rail on the outside of the curve is higher than the rail on the inside. The cant, or the difference in elevation between the top surfaces of the outer and inner rails, is 105 mm at a track gauge of 1067 mm (Source: Japan Private Railway Association). Therefore, conventional methods require jacking or other adjustments to correct the cant, preventing instability due to the difference in level between the scaffolding on the outer rail and the scaffolding on the inner rail. However, in this embodiment, bogies installed on both rails are supported like balancers, and track-mounted mobile scaffolding devices are extended above each rail while maintaining balance. Working scaffolding is then installed on both track-mounted mobile scaffolding devices. This allows for stable scaffolding within the construction gauge, regardless of the magnitude of the cant.

[0054] Furthermore, with this embodiment, when the scaffolding is raised, i.e., when it is raised, it avoids the overhead wires strung above the adjacent track, allowing stable work within the construction gauge of one track. Electrical lines carry a high voltage of 20,000 volts, and electrocution is possible within 2 meters. Therefore, power must be stopped where work is being performed. If the scaffolding or work platform extends beyond the construction gauge, power to adjacent tracks must also be stopped. This embodiment allows trolley trains to run on adjacent tracks, even in areas with many tracks, such as within train stations. Since power can be stopped only on the tracks requiring repair work, the impact on railway operations is minimized. While conventional methods required three hours of power outages to allow work to be performed for only 20 minutes, this method shortens power outage times by extending the scaffolding from 2.9 m to 4.5 m in less than 10 minutes and completing assembly and disassembly in 30 minutes. This embodiment is extremely convenient as a railway scaffolding that must be assembled in a short time to carry out overpass repair work.

[0055] According to this embodiment, each unit can be carried separately by a person, shortening the work time. Furthermore, the scaffolding is lightweight while providing sufficient strength, and is easily assembled and disassembled. The telescopic unit alone is easy to carry, reducing the burden on workers. Furthermore, the folding frame is prevented from becoming unstable in the extended state, and the upper frame body is prevented from sinking into the lower frame body during folding, which would impair the workability of the next extension work. The handles make extension even easier, and a stable scaffolding can be provided even on slopes. Furthermore, when using the handles, it is easier to apply force by hand to push down the folding frame than to push it up, making the work easier.

[0056] The present invention is not limited to the above-described embodiments, and various modifications and variations are possible without departing from the spirit of the invention. Furthermore, the components of the above-described embodiments can be combined in any manner without departing from the spirit of the invention. [Explanation of symbols]

[0057] 1. On-track mobile scaffolding device 2 Pedestal Unit 21 wheels 22 axles 23 Base plate 24 Gradient adjustment mechanism 25 Trolley 26 Swing Frame 3 Outrigger 4 Telescopic unit 41 Folding Frame 411 Upper frame body 412 Lower frame body 413 Upper frame connecting shaft 414 Lower frame connecting shaft 415 Side girder (upper) 416 Side girder (lower) 417 Upper frame cross member 418 Lower frame cross member 419 Hinge connecting shaft 421 Anti-rotation pin plate (frame body side) 422 Anti-reverse plate (frame body side) 431 Vertical Damper Auxiliary 432 Vertical Damper 433 Lower frame auxiliary damper 434 Arm 44 Toride 441 Shaft connection 442 Handle 451 Fixed frame mounting holes 46 Spacing material 472 Post base 475 Anti-rotation pin plate (base side of support) 476 Anti-reversal plate (base side of support) 48 Fixed Frame 481 Pillar section 483 Retaining bracket 484 Hook 485 Mounting protrusion 486 Lying position 491 Lower Frame 492 Upper Frame 493 Middle Frame 494 Lower frame horizontal member 5 Working Platform Unit 51 Flooring 52 Handrail 53 Handrail Post 54 Baseboard 6 Connection 61 Tie beam 62 Handrail 64 Baseboard R rail T trolley line K building limit E. Area of ​​influence of extra-high voltage overhead lines H worker

Claims

1. An on-track mobile scaffolding device for repairing an overpass, The device comprises a base unit that can move on a track, a pair of telescopic units that are detachably installed on the base unit, a working floor unit that is detachably attached to the upper ends of the telescopic units, and a connecting part that connects the working floor units to each other and links the telescopic units to form a foothold for the working floor units, The telescopic units each include: A ladder-like folding frame that forms a support body when extended and can be bent and stretched freely in two in a dogleg shape; an upper frame, a middle frame, and a lower frame, which are frame bodies; Equipped with The folding frame is A track-based mobile scaffolding device characterized in that in each of the telescopic units, four units are arranged between the upper end frame and the lower end frame, sandwiching the middle frame, in two tiers stacked one on top of the other, facing both ends of the telescopic unit, and each unit is independently movable.

2. The folding frames each include: a ladder-shaped upper frame body having an upper frame connecting shaft at its upper end and side girders on both sides; a ladder-shaped lower frame body having a lower end of the lower frame connecting shaft and side girders on both sides; a hinge portion connecting shaft that forms the lower end of the upper frame body and the upper end of the lower frame body, rotatably connecting the upper frame body and the lower frame body to each other and storing the folding frame in half inside the extension unit; and When the folding frame is extended, the upper frame connecting shaft, the lower frame connecting shaft, and the hinge portion connecting shaft constitute a part of the horizontal member of the support body, and the side girder constitutes a part of the support of the support body, The telescopic unit is a lower frame auxiliary damper attached to the lower frame body and adapted to assist the folding frame when the folding frame is extended; a vertical damper auxiliary device provided under the middle frame to assist the middle frame when it rises; and 2. The track-mounted mobile scaffolding device according to claim 1, wherein the vertical damper auxiliary device is attached to the lower end frame between the facing lower folding frames, and supports the middle frame when the telescopic unit is folded.

3. The telescopic unit is a fixing frame that is detachably attached to the inside of the extension unit when the folding frame is extended and reinforces the extension unit; a locking mechanism that prevents the upper frame body and the lower frame body from over-rotating and maintains a gap between the upper frame body and the lower frame body when the folding frame is folded in half; a handle for manually extending the folding frame; and The base unit is Wheels that can run on rails; A swing frame having a gradient adjustment mechanism that adjusts the height and inclination of the left and right rails; a base plate on which the extension unit can be placed; an outrigger for fixing the base plate; 3. The on-rail moving scaffolding device according to claim 2, further comprising:

4. A method for assembling an on-track mobile scaffolding device using the on-track mobile scaffolding device according to any one of claims 1 to 3, a base installation step of installing the base unit on a track; an extension unit placing step of placing the extension unit on the base unit; a work platform unit mounting step of mounting the work platform unit on the extension unit; an upper extension step of extending the upper folding frame of the telescopic unit; an upper stage fixing step of fixing the upper stage folding frame of the telescopic unit in an extended state; a lower extension step of extending the folding frame of the lower section of the telescopic unit; a lower stage fixing step of fixing the lower stage folding frame of the telescopic unit in an extended state; a connecting step of connecting the pair of telescopic units at the connecting portions and connecting the pair of working platform units at the connecting portions; A method for assembling a track-based mobile scaffolding device, comprising:

5. A method for assembling an on-track mobile scaffolding device using the on-track mobile scaffolding device according to claim 3, comprising: The upper extension step and the lower extension step each include: a handle attachment step of attaching the handle to a lower frame connecting shaft of the folding frame to be extended; When the handle is pushed down, the lower frame connecting shaft rotates due to a shaft connecting portion connecting the handle and the lower frame connecting shaft, pushing up the hinge portion connecting shaft of the folding frame, thereby extending the folding frame; 5. The method for assembling the track-based mobile scaffolding device according to claim 4, further comprising:

Images