Moving scaffold device for cable for cable-stayed bridge and method for moving cable scaffold using the same

Abstract

To provide a moving scaffold device for cable for a cable-stayed bridge and a method for moving a cable scaffold, capable of performing inspection and repair work by an expert worker, even for a cable at a height position higher than the workable height of an aerial work platform.SOLUTION: A moving scaffold device for cable comprises a working scaffold 10 on which a worker A is carried, a support wire 20 stretched between a main tower 2 and a bridge girder 4, and a drive wire 30 connecting the main tower 2 and the working scaffold 10. Since the working scaffold 10 is supported movably along a cable 3 by the support wire 20 and the working scaffold 10 is allowed to move along the cable 3 by the drive wire 30, the working scaffold 10 can be moved to the upper end side of the cable 3 even at a height position higher than the workable height of an aerial work platform, and an expert worker A can carry out inspection and repair work of the cable 3 on the working scaffold 10.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a mobile scaffold device for cables for inspecting, repairing, etc. of cables extending from the main tower of a cable-stayed bridge toward the bridge girder, and a scaffold moving method for cables using the same.

Background Art

[0002] A cable-stayed bridge is a bridge that supports the bridge girder with cables from the main tower, and is mainly used for bridges with long spans. Currently, many cable-stayed bridges have been in existence for over 30 years since completion, and regular inspection and repair of cables, which are one of the main components, are required. In this case, a professional engineer visually inspects the appearance, damage, and deterioration of the cables using inspection equipment to evaluate the condition of the cables. If cracks, corrosion, deformation, etc. are found in the cables, repairs are carried out.

[0003] When performing such inspection and repair work, methods such as directly carried out by a professional engineer using an aerial work platform, inspection by rope access, or inspection by an unmanned inspection device that crawls on the cable (see, for example, Patent Document 1) are known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when using an aerial work platform, there is a problem that inspection cannot be performed when the height of the cable of the cable-stayed bridge exceeds the workable height of the aerial work platform (for example, 45 m). On the other hand, in the case of rope access or an unmanned inspection device, inspection at heights exceeding the accessible height of the aerial work platform is possible. However, for workers performing rope access or unmanned inspection devices, since cable specialists cannot directly visually inspect the cable in close proximity, detailed inspection becomes insufficient, and there is a problem that repair work cannot be performed only by inspection.

[0006] The present invention has been made in view of the above problems, and an object thereof is to provide a movable scaffold device for a cable of a cable-stayed bridge and a method for moving a scaffold for a cable, which can perform inspection and repair work by a specialist even on a cable at a height position exceeding the workable height of an aerial work platform.

Means for Solving the Problems

[0007] In order to achieve the above object, the present invention provides a movable scaffold device for a cable of a cable-stayed bridge installed on a cable extending obliquely from a main tower of the cable-stayed bridge toward a bridge girder, which includes a work scaffold for carrying a worker, a support means for supporting the work scaffold so as to be movable along the cable, and a driving means for moving the work scaffold supported by the support means along the cable.

[0008] Thereby, since the work scaffold moves along the cable by the support means and the driving means, it becomes possible to move the work scaffold to the upper end side of the cable even at a height position exceeding the workable height of the aerial work platform.

[0009] Further, in order to achieve the above object, the present invention provides a method for moving a work platform along cables of a cable-stayed bridge, wherein the work platform is moved along a plurality of cables extending obliquely upward and downward at intervals from the main tower of the cable-stayed bridge toward the bridge girder. In this method, a work platform on which an operator rides, a support means for supporting the work platform movably along the cables, a driving means for moving the work platform supported by the support means along the cables, and a lifting means for moving the work platform supported by the support means in the vertical direction are provided. After moving the work platform along the cable at an arbitrary position in the vertical direction toward one side, the work platform is raised or lowered to the position of another cable in the vertical direction, and then moved along the other cable in the vertical direction toward the other side.

[0010] Thereby, in addition to the above action, the work platform that has moved along the cable at an arbitrary position in the vertical direction toward one side is raised or lowered to the position of another cable in the vertical direction, and then moved along the other cable in the vertical direction toward the other side. Therefore, it is possible to minimize the moving distance of the work platform along each cable.

Effects of the Invention

[0011] According to the cable moving work platform device for a cable-stayed bridge of the present invention, even at a height position exceeding the working height of an aerial work vehicle, the work platform can be moved to the upper end side of the cable. Therefore, a professional technician can ride on the work platform to inspect and repair the cable. Furthermore, not only inspection of the cable but also repair work can be performed, so that cable maintenance can be carried out efficiently.

[0012] In addition, according to the method for moving a work platform along cables of a cable-stayed bridge of the present invention, in addition to the above effects, the moving distance of the work platform along each cable can be minimized, so that the inspection work of the entire cable can be carried out extremely efficiently.

Brief Description of the Drawings

[0013]

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Best Mode for Carrying Out the Invention

[0014] Figs. 1 to 11 show a first embodiment of the present invention and illustrate a traveling scaffold device for cables of a cable-stayed bridge.

[0015] The cable-stayed bridge 1 shown in the figure is supported by a plurality of cables 3 extending obliquely from the main tower 2, and each cable 3 is arranged at intervals in the vertical direction. In this embodiment, two cables 3 are provided on each side of the main tower 2 in the vertical direction, and each cable 3 extends radially (not parallel to each other).

[0016] The traveling scaffold device for cables of this embodiment includes a working scaffold 10 on which an operator A (for example, a professional technician) rides, and the working scaffold 10 is movably supported by a support wire 20 stretched between the main tower 2 and the bridge girder 4, and the working scaffold 10 is moved along the cable 3 by a driving wire 30 connected to the main tower 2. Further, a pedestal 40 on which the working scaffold 10 is placed is installed on the lower end side of each cable 3.

[0017] The working scaffold 10 includes a scaffold body 11 formed in a cage shape, a support member 12 movably engaged with the support wire 20, a first winch 13 for winding or unwinding the driving wire 30, a pair of suspension wires 14 as suspension members for suspending the scaffold body 10 from the support member 12, and a pair of second winches 15 as lifting means for winding or unwinding each suspension wire 14. That is, the support wire 20 and the support member 12 constitute a support means, the driving wire 30 and the first winch 13 constitute a driving means, and the suspension wire 14 and the second winch 15 constitute a lifting means.

[0018] The lower side of the scaffold body 11 is surrounded by a handrail 11a, and the upper side is open so that the operator A can work on the cable 3 from the upper side.

[0019] The support member 12 has a pair of rollers 12a that are rotatably engaged with the support wire 20, and the scaffold body 11 is supported by the rotation of each roller 12a so as to be movable along the support wire 20.

[0020] The first hoisting machine 13 is provided on the support member 12 and is configured to move the work scaffold 10 along the support wire 20 by winding or unwinding the drive wire 30.

[0021] Each suspension wire 14 extends downward from each second hoisting machine 15 and is respectively connected to both ends of the scaffold body 11 in the front-rear direction (cable longitudinal direction).

[0022] Each second hoisting machine 15 is provided on the support member 12 and is configured to raise and lower the work scaffold 10 by winding or unwinding each suspension wire 14.

[0023] The support wire 20 is disposed above the upper cable 3, has one end connected to the main tower 2, and the other end fixed to the bridge girder 4 by an anchor 21. In this case, the support wire 20 is provided to be parallel to the upper cable 3.

[0024] The drive wire 30 is disposed below the support wire 20, has one end connected to the main tower 2, and the other end side is wound or unwound by the first hoisting machine 13 of the work scaffold 10.

[0025] Further, the support wire 20 and the drive wire 30 are displaced to one side in the width direction of the main tower 2 (perpendicular to the bridge axis) with respect to each cable 3 as shown in FIG. 4, so that the work scaffold 10 is located on one side of each cable 3. Also, in the figure, the support wire 20 and the drive wire 30 are shown as extending linearly, but in reality, they may bend downward due to their own weight.

[0026] Here, a method for inspecting and repairing each cable 3 using the cable moving scaffold device will be described.

[0027] First, as shown in FIG. 2, the work platform 10 is made to wait on the pedestal 40 on the lower end side of the upper cable 3, and the work platform 10 is loaded with worker A and safety devices, materials, equipment, etc. necessary for inspection and the like.

[0028] Next, by operating the first hoist 13 of the work platform 10 to wind up the drive wire 30, the work platform 10 is moved obliquely upward in parallel with the cable 3 along the support wire 20 as shown in FIG. 5. At this time, when the distance between the support wire 20 and the upper cable 3 changes due to the deflection of the support wire 20, the work platform 10 is raised and lowered by each second hoist 15 to adjust the height position of the work platform 10. Further, by independently raising and lowering both ends in the cable length direction of the work platform 10 by each second hoist 15, the inclination of the work platform 10 can be adjusted so that the work platform 10 is always horizontal.

[0029] Worker A on the work platform 10 inspects the steel wire breakage of the cable 3, peeling of the coating, damage to the cable fixing part, peeling of the coating of the fixing block, corrosion of the cable cover, water leakage in the cable part, etc., and performs repair work on the work platform 10 if these repairs are necessary.

[0030] While moving the work platform 10 toward the upper end side of the cable 3 as described above, inspection, repair, etc. of the cable 3 are performed. When the work platform 10 reaches the upper end side of the upper cable 3 as shown in FIG. 6, the work platform 10 is lowered to the upper end side of the lower cable 3 by each second hoist 15 as shown in FIG. 7.

[0031] After that, by unwinding the drive wire 30 with the first hoist 13 of the work platform 10, inspection, repair, etc. of the lower cable 3 are performed in the same manner as above while moving the work platform 10 toward the lower end side of the cable 3 as shown in FIG. 8. At this time, since the support wire 20 and the lower cable 3 are not parallel, the work platform 10 is moved along the cable 3 while lowering the work platform 10 by each second hoist 15 according to the change in the distance between the support wire 20 and the lower cable 3 and the deflection of the support wire 20.

[0032] Then, as shown in FIG. 9, when the work platform 10 reaches the pedestal 40 on the lower end side of the cable 3, the work is terminated.

[0033] In addition, when the work is interrupted, such as when the weather suddenly deteriorates during the work, the work platform 10 can be vertically lowered from the work position to the bridge girder 4 by each second hoist 15, so that the worker A can be quickly lowered from the work platform 10.

[0034] As described above, according to the present embodiment, the work platform 10 on which the worker A rides, the support wire 20 stretched between the main tower 2 and the bridge girder 4, and the drive wire 30 connecting the main tower 2 and the work platform 10 are provided. The support wire 20 supports the work platform 10 movably along the cable 3, and the drive wire 30 moves the work platform 10 along the cable 3. Therefore, even at a height position exceeding the workable height of the aerial work vehicle, the work platform 10 can be moved to the upper end side of the cable 3, and the worker A can ride on the work platform 10 to inspect and repair the cable 3. Further, not only inspection of the cable 3 but also repair work can be performed, so that maintenance of the cable 3 can be efficiently performed.

[0035] Further, since the support wire 20 is disposed above the cable 3 and the work platform 10 is suspended from the support wire 20 by each second hoist 15 and each suspension wire 14 so as to be movable up and down, the work platform 10 can be moved to the position of each cable 3, and the inspection work for each cable 3 can be easily performed.

[0036] In this case, after inspecting the upper cable 3 while moving the work platform 10 upward from below along the upper cable 3, the work platform 10 is lowered to the position of the lower cable 3, and the lower cable 3 is inspected while moving the work platform 10 downward from above along the lower cable 3. Therefore, the moving distance of the work platform 10 along each cable 3 can be minimized, and the inspection work for the entire cable can be performed extremely efficiently.

[0037] In addition, since each second hoist 15 is configured to raise and lower both ends of the work platform 10 in the cable length direction of the work platform 10, the inclination of the work platform 10 can be adjusted so that the work platform 10 is always horizontal, and it is possible to cope with changes in the inclination of the work platform 10 due to the deflection of the support wire 20 and work on cable-stayed bridges with different cable inclination angles.

[0038] In the above embodiment, the support wire 20 and the drive wire 30 are arranged so as to be shifted to one side in the width direction (direction perpendicular to the bridge axis) of the main tower 2 with respect to each cable 3, and the work platform 10 is located on one side of each cable 3. However, as shown in the modification of FIG. 10, the support wire 20 and the drive wire 30 may also be provided on the other side in the width direction of the main tower 2 with respect to each cable 3, and a pair of work platforms 10 supported by each support wire 20 may be arranged on both sides in the width direction of the cable 3, respectively. Thereby, since work can be performed from both sides in the width direction with respect to the cable 3, the cable 3 can be easily inspected and repaired over the entire circumference.

[0039] Also, as shown in another modification of FIG. 11, the support wire 20 may be provided with two work platforms 10 supported at intervals in the cable length direction, and the inspection work may be performed on the leading one of the work platforms 10 and the repair work may be performed on the other work platform 10. Thereby, since the inspection and repair of the cable 3 can be performed by divided flow work on each work platform 10, the workability can be improved.

[0040] FIGS. 12 to 21 show a second embodiment of the present invention, and the same components as those in the first embodiment are denoted by the same reference numerals.

[0041] The cable moving work platform device of the present embodiment includes a work platform 50 on which an operator A rides, the work platform 50 is movably supported on the cable 3 of the cable-stayed bridge 1, and the work platform 50 is moved along the cable 3 by a drive wire 60 connected to the main tower 2.

[0042] The work platform 50 includes a platform body 51 formed in a cage shape, a support member 52 as a support means that movably engages with the cable 3, and a hoist 53 as a driving means for winding or unwinding the drive wire 60.

[0043] The platform body 51 has its lower side surrounded by a handrail 51a and its upper side open, allowing the operator A to work on the cable 3 from the upper side.

[0044] The support member 52 is provided on the upper end side of the platform body 51 and has a pair of rollers 52a that rollably engage with the cable 3.

[0045] The hoist 53 is provided at one end side in the front-rear direction of the platform body 51 and is configured to move the work platform 50 along the cable 3 by winding or unwinding the drive wire 60.

[0046] The drive wire 60 is disposed below the cable 3, with one end connected to the main tower 2 and the other end being wound or unwound by the hoist 53 of the work platform 50.

[0047] When performing inspection and repair work on each cable 3 using the cable moving platform device of this embodiment, as shown in FIG. 13, the work platform 50 is arranged at the lower end side of the upper cable 3, and the operator A and safety equipment, materials, machinery, etc. necessary for inspection are loaded onto the work platform 10.

[0048] Next, by operating the hoist 53 of the work platform 50 to wind the drive wire 60, the work platform 50 is moved upward along the cable 3 as shown in FIG. 14.

[0049] The operator A on the work platform 50 inspects the steel wire breakage of the cable 3, coating peeling, damage to the cable fixing part, coating peeling of the fixing block, corrosion of the cable cover, water leakage in the cable part, etc., and performs repair work on the work platform 50 if such repairs are necessary.

[0050] While moving the work platform 50 toward the upper end side of the cable 3 as described above, inspection, repair work, etc. of the cable 3 are performed. When the work platform 50 reaches the upper end side of the upper cable 3 as shown in FIG. 15, the driving wire 60 is unwound by the hoist 53 of the work platform 50, and the work platform 50 is moved to the lower end side of the cable 3 as shown in FIG. 16.

[0051] Next, the work platform 50 is removed from the upper cable 3 and the work platform 50 is arranged at the lower end side of the lower cable 3 as shown in FIG. 17. At this time, since the inclination angle of the lower cable 3 is different from that of the upper cable 3, the inclination angle of the support member 52 is changed according to the inclination angle of the lower cable 3.

[0052] After that, while moving the work platform 50 toward the upper end side of the cable 3 as shown in FIG. 18, inspection, repair, etc. of the lower cable 3 are performed in the same manner as described above. When the work platform 50 reaches the upper end side of the lower cable 3 as shown in FIG. 19, the driving wire 60 is unwound by the hoist 53 of the work platform 50, and the work platform 50 is moved to the lower end side of the cable 3 as shown in FIG. 20 to finish the work.

[0053] As described above, according to the present embodiment, the work platform 50 movably supported by the cable 3 and the driving wire 60 connecting the main tower 2 and the work platform 50 are provided, and the work platform 50 is moved along the cable 3 by the driving wire 60. Therefore, as in the above embodiment, even at a height position exceeding the workable height of the aerial work vehicle, the work platform 50 can be moved to the upper end side of the cable 3, and the operator A can be placed on the work platform 50 to perform inspection and repair work on the cable 3.

[0054] In the second embodiment, the case where the work of the lower cable 3 is performed after the work of the upper cable 3 is shown. However, the work of the upper cable 3 may be performed after the work of the lower cable 3, or the inspection work of the cable 3 may start from either the lower end side or the upper end side of the cable 3.

[0055] Also, as shown in the modification example of FIG. 21, it is provided with two working platforms 50 supported by the cable 3, and the other working platform 50 without the hoist 53 is connected to one working platform 50 having the hoist 53 by a connecting wire 70. By moving each working platform 50 integrally, inspection work may be performed on the leading one working platform 50, and repair work may be performed on the other working platform 50. Thereby, inspection and repair of the cable 3 can be performed by flow work divided into each working platform 50, respectively, so that workability can be improved.

[0056] Furthermore, in each of the above embodiments, the cable moving work platform device of the present invention is installed on the cable 3 arranged on one side in the bridge axis direction of the main tower 2. However, the cable moving work platform devices of the present invention may be installed on the cables 3 arranged on one side and the other side in the bridge axis direction of the main tower 2, respectively, and the work by each cable moving work platform device may be performed simultaneously.

Explanation of Reference Numerals

[0057] 1... Cable-stayed bridge, 2... Main tower, 3... Cable, 10... Working platform, 11... Platform body, 12... Support member, 13... First hoist, 14... Suspension wire, 15... Second hoist, 20... Support wire, 30... Driving wire, 50... Working platform, 51... Platform body, 52... Support member, 53... Hoist, 60... Driving wire, A... Worker.

Claims

1. In a cable moving scaffold device for a cable-stayed bridge installed on a cable extending obliquely from the main tower of the cable-stayed bridge toward the bridge girder, a working scaffold for carrying an operator, support means for supporting the working scaffold so as to be movable along the cable, and driving means for moving the working scaffold supported by the support means along the cable. A cable moving scaffold device for a cable-stayed bridge, characterized by the above.

2. The support means includes a support wire stretched between the main tower and the bridge girder so as to be located above the cable, a support member movably engaged with the support wire, and a suspension member for suspending the working scaffold from the support member. The cable moving scaffold device for a cable-stayed bridge according to claim 1, characterized by the above.

3. The cable moving scaffold device for a cable-stayed bridge according to claim 2, further comprising lifting means for lifting and lowering the working scaffold supported by the support means. The cable moving scaffold device for a cable-stayed bridge according to claim 2, characterized by the above.

4. The lifting means is configured such that both ends of the working scaffold in the cable length direction can be independently lifted and lowered. The cable moving scaffold device for a cable-stayed bridge according to claim 3, characterized by the above.

5. A plurality of the working scaffolds are provided, and each working scaffold is arranged on both sides in the width direction of the cable. The cable moving scaffold device for a cable-stayed bridge according to claim 2, characterized by the above.

6. A plurality of the working scaffolds are provided, and each working scaffold is arranged at intervals in the cable length direction. The cable moving scaffold device for a cable-stayed bridge according to claim 1, characterized by the above.

7. The support means includes a support member movably engaged with the cable. The cable moving scaffold device for a cable-stayed bridge according to claim 1, characterized by the above.

8. The driving means includes a driving wire connected to the main tower side, and is configured to move the working scaffold by winding the driving wire in or out on the working scaffold side. The cable moving scaffold device for a cable-stayed bridge according to any one of claims 1 to 7, characterized by the above.

9. [[ID=**********]]In a method for moving a scaffold along cables of a cable-stayed bridge, the cables extend obliquely from the main tower of the cable-stayed bridge toward the bridge girder with a vertical interval between each other, and the working scaffold is moved along the plurality of cables. Using a cable moving work platform device comprising a work platform for carrying an operator, a support means for movably supporting the work platform along the cable, a driving means for moving the work platform supported by the support means along the cable, and a lifting means for moving the work platform supported by the support means in the vertical direction, After moving the work platform along the cable at an arbitrary position in the vertical direction towards one side, raising or lowering the work platform to the position of another cable in the vertical direction, and moving the work platform along another cable in the vertical direction towards the other side A method for moving a work platform for a cable of a cable-stayed bridge, characterized by the above.

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