Lifting scaffolding

Abstract

This will reduce the duration of traffic restrictions and improve work efficiency. [Solution] The connecting mechanism 22 supports the two second side work platforms 24 so that they can move between a work position in which the tip 20A is positioned in the center of the width direction of the side wall 122, and a retracted position in which the tip 20A of the second side work platform 24 located outside the width direction W of the transport path 110 is positioned on the same plane as the virtual extension surface 122V of the side wall 122 located outside the width direction W of the transport path 110, or is positioned inside the width direction W of the transport path 110 from the virtual extension surface 122V.

Description

Technical Field

[0001] The present invention relates to a lifting scaffold.

Background Art

[0002] In recent years, renovation work such as seismic reinforcement work and renewal work of bridge piers of viaducts has been increasing. Main renovation work under the floor slab includes reinforcement work of bridge piers (RC winding, steel plate winding), replacement work of bearings at the joint between the upper structure and the lower structure, and the like.

[0003] As a normal scaffold used when performing such work, for example, a method of constructing a handrail leading scaffold on a footing is adopted. Further, for example, a movable lifting scaffold is disclosed in which a liftable platform (working scaffold) is provided on a mast installed vertically along a structure, and the platform is provided with a motor that serves as a driving force (see Patent Document 1). The platform of this movable lifting scaffold can move up and down and stop at any position of the mast.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, reinforcement work and bearing replacement work of bridge piers usually take a period of 2 to 4 months. However, when there is a public road (sidewalk) adjacent to the bridge pier, if the above-mentioned normal scaffold or a movable lifting scaffold such as that in Patent Document 1 is used, the scaffold will always be located above the adjacent public road during the construction, so traffic restrictions such as lane restrictions had to be constantly imposed during the construction period. Furthermore, with mobile lifting scaffolding like that described in Patent Document 1, if it is installed in a way that avoids contact with adjacent bridge piers or public roads, it may not be possible to position the work scaffolding at the desired construction site, which can lead to a decrease in work efficiency.

[0006] This invention has been made in view of the above circumstances, and aims to provide a liftable scaffolding that reduces the time of traffic restrictions by allowing the lifting of traffic restrictions at the end of work or when the scaffolding is raised or lowered, even during the construction period, and also improves work efficiency. [Means for solving the problem]

[0007] To achieve the above-mentioned objective, one embodiment of the present invention provides a liftable scaffolding for use in repair work on the pier of an elevated bridge, the pier having a transport route and a pier supporting the transport route at a high altitude, the pier having a pair of front walls facing the longitudinal direction of the transport route and a pair of side walls facing the width direction of the transport route, the liftable scaffolding is composed of a pair of separate segmented scaffoldings arranged on the pair of front walls, each segmented scaffolding comprises a mast that stands upright along the front wall, a drive unit that moves up and down along the mast, a front work scaffolding installed on the drive unit and extending along the front wall in the width direction of the transport route, and a pair of first side work scaffoldings connected to both ends of the front work scaffolding in the longitudinal direction and extending along the side wall in the longitudinal direction of the transport route, the pair of first side work scaffoldings of the pair of segmented scaffolding The scaffolding is characterized in that, of the scaffolding, the two first side work scaffoldings provided at at least one end in the longitudinal direction of the front work scaffolding are provided as two second side work scaffoldings connected to one end in the longitudinal direction of the front work scaffolding via a connecting mechanism, and the connecting mechanism supports the two second side work scaffoldings so that they can move between a working position in which they extend along the side wall and their tips are located in the center of the width direction of the side wall, and a retracted position in which, when viewed from above, the tips are located away from the front wall in the longitudinal direction of the transport path, and the portion of the second side work scaffolding located outside the width direction of the transport path is located on the same plane as the virtual extension plane of the side wall located outside the width direction of the transport path, or is located inside the width direction of the transport path from the virtual extension plane.

[0008] Furthermore, in one embodiment of the present invention, the bridge piers are provided in a plurality at intervals in the width direction of the transport route at intervals in the longitudinal direction of the transport route, and the two first side work platforms, which are arranged along the side walls of the bridge piers located at at least one end of the transport route in the width direction, facing outward in the width direction of the transport route, are provided as the two second side work platforms.

[0009] Furthermore, in one embodiment of the present invention, the connecting mechanism is characterized in that it includes widthwise guides provided at the longitudinal ends of the front work platform, and longitudinal guides that are movably connected to each of the widthwise guides in the width direction of the transport path and support the second side work platform so as to be movable in the longitudinal direction of the transport path.

[0010] Furthermore, one embodiment of the present invention is characterized in that the two second side work platforms are provided with a scaffolding coupling portion that can be switched between a coupled state in which the leading edges of the two second side work platforms are coupled in a way that prevents relative movement of the two leading edges that are close to each other at the work position, and a released state in which the coupling is released.

[0011] Furthermore, one embodiment of the present invention is characterized in that openable and closable doors are provided at the tips of the two second side work platforms and at the locations where the second side work platforms at the work position are connected to the front work platform, and handrails are provided at the locations of the second side work platforms other than where the doors are provided.

[0012] Furthermore, in one embodiment of the present invention, the lower part of the mast is provided with a plurality of rolling wheels and a movable part that movably supports the liftable scaffolding, as described in claim 1 or 2. [Effects of the Invention]

[0013] According to one embodiment of the present invention, the connecting mechanism supports two second side work platforms so that they can move between a working position where the platform extends along the side wall and its tip is located in the center of the width direction of the side wall, and a retraction position where, when viewed from above, the platform is positioned away from the front wall in the longitudinal direction of the transport route, and the portion of the second side work platform located on the outside in the width direction of the transport route is positioned on the same plane as the virtual extension plane of the side wall located on the outside in the width direction of the transport route, or is positioned inside the width direction of the transport route from the virtual extension plane. Therefore, by moving the second side work platform to the retraction position, traffic restrictions on the public road adjacent to the side wall can be lifted, and by moving the second side work platform to the working position, it becomes possible to perform work around the entire circumference of the bridge pier. Consequently, even during the construction period, it is advantageous to reduce the time of traffic restrictions by being able to lift them when work is completed or when the scaffolding is raised or lowered, and to improve work efficiency. Furthermore, even when bridge piers are spaced apart along the longitudinal direction of the transport route and multiple piers are provided at intervals along the width direction of the transport route, arranging two second-side work platforms along the side walls of the bridge piers facing outward in the width direction of the transport route can reduce traffic restriction time and improve work efficiency, which is advantageous in shortening the construction period. Furthermore, if the connecting mechanism is composed of widthwise guides provided at the longitudinal ends of the front work platform and longitudinal guides that are movably connected to each widthwise guide in the width direction of the transport path and support the second side work platform so as to be movable in the longitudinal direction of the transport path, the connecting mechanism can be provided with a simple configuration, which is advantageous in reducing costs. Furthermore, if the two second side work platforms are equipped with scaffolding connection parts that can be switched between a connected state in which the leading edges of the two platforms are coupled in a way that prevents relative movement of the two platforms at the work position, and a released state in which the coupling is released, the two second side work platforms at the work position can be stabilized, which is advantageous in improving work efficiency. Furthermore, if openable and closable doors are provided at the ends of the two second side work platforms and at the points where the second side work platforms connect to the front work platform, and handrails are provided on the parts of the second side work platforms excluding the areas where doors are installed, it will be easier to work on the work platforms and will be advantageous in improving work efficiency. Furthermore, if a movable section is provided at the bottom of the mast to support a movable liftable scaffolding, it will be advantageous to easily move to the next bridge pier once the renovation work on one pier is completed. [Brief explanation of the drawing]

[0014] [Figure 1] This diagram shows the two second-side work platforms in their working positions. [Figure 2] This figure shows the two second-side work platforms separated from the work position in the longitudinal direction of the transport route. [Figure 3] This diagram shows the two second-side work platforms in their retracted positions. [Figure 4] This is an explanatory diagram of the connecting mechanism that links the second side work platform and the front work platform. [Figure 5] This is an enlarged view of the coupling mechanism as seen along the longitudinal direction of the transport route. [Figure 6] This is an enlarged view of the coupling mechanism as seen in the width direction of the transport path. [Figure 7] (A) shows the liftable scaffolding attached to the bridge pier positioned below the side road, (B) shows the liftable scaffolding positioned at the same height as the side road, and (C) shows the liftable scaffolding positioned above the side road. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments of the present invention will be described with reference to Figures 1 to 7. As shown in Figure 1, the elevated bridge 100 to which the lifting scaffolding 10 of this embodiment is applied comprises a transport route 110 such as a road or railway, and bridge piers 120 that support the transport route at a high elevation. Also, as shown in FIG. 7, in the present embodiment, on both outer sides in the width direction W of the transport path 110, the transport paths (sidewalks 210) of another elevated bridge 200 are adjacent. The bridge piers 120 of the present embodiment are provided one by one (two in total) at intervals in the width direction W of the transport path 110, and the number corresponding to the length in which the elevated bridge 100 extends is provided at locations spaced in the longitudinal direction L of the transport path 110. As shown in FIGS. 1 to 3, the bridge pier 120 has a pair of front walls 121 facing the longitudinal direction L of the transport path 110 and a pair of side walls 122 facing the width direction W of the elevated bridge 100, and the horizontal cross section has a rectangular shape.

[0016] The elevating scaffold 10 of the present embodiment is used for the repair work of the bridge pier 120. The elevating scaffold 10 is composed of a pair of separated divided scaffolds 12 arranged on the pair of front walls 121. As shown in FIGS. 1 to 3, each divided scaffold 12 includes a mast 14, a drive unit 16, a front working scaffold 18, a pair of first side working scaffolds 20, a connecting mechanism 22, a second side working scaffold 24, a scaffold coupling part, a door 28, a handrail 30, and a moving part 32.

[0017] The mast 14 is erected along the front wall 121. The locations spaced in the vertical direction of the mast 14 are attached to a coupling part (not shown) made of the reinforcing bars of the front wall 121 or the like, and the prevention of tipping is achieved. The drive unit 16 is provided to move up and down along the mast 14, and various conventionally known structures can be adopted for the drive unit 16.

[0018] The front working scaffold 18 is installed on the drive unit 16. The front working scaffold 18 includes a floor part and a handrail, extends in the width direction W of the transport path 110 along the front wall 121, and extends over the entire width of the front wall 121.

[0019] A pair of first side work platforms 20 are provided, connected to each of the longitudinal ends of the front work platform 18. The first side work platforms 20 extend from the longitudinal ends of the front work platform 18 along the side walls 122, that is, along the longitudinal direction L of the transport path 110, with their ends 20A located in the center of the width direction of the side walls 122.

[0020] Of the pair of first side work platforms 20 of the pair of divided scaffolding 12, the two first side work platforms 20 provided at one end of the front work platform 18 in the longitudinal direction, more specifically, the two first side work platforms 10 located on the side wall 122 on the side adjacent to the transport route (side road 210) of another elevated bridge 200, are provided as two second side work platforms 24 connected to the longitudinal end of the front work platform 18 via a connecting mechanism 22.

[0021] As shown in Figure 4, the connecting mechanism 22 includes widthwise guides 40 provided at the longitudinal ends of each front work platform 18, and longitudinal guides 42, as shown in Figures 5 and 6, which are movably connected to each widthwise guide 40 in the width direction W of the transport path 110 and support the second side work platform 24 so as to be movable in the longitudinal direction L of the transport path 110. In Figure 4, a portion of the floorboard of the front work platform 18 has been broken to clarify the widthwise guide 40.

[0022] The widthwise guide 40 is provided at one end of the front work platform 18 on the side to which the second side work platform 24 is joined in the longitudinal direction, and consists of a widthwise first rail 4001 and a widthwise second rail 4002 that extend along the widthwise direction W of the transport path 110. Two first rails 4001 in the width direction are installed on the underside of both ends of the front work platform 18 in the width direction, extending in the width direction W of the transport path 110 from near the mast 14 to one end of the front work platform 18 in the longitudinal direction. The second rail 4002 in the width direction is installed in pairs, extending in the width direction W of the transport path 110 with the same width as the first rail 4001 in the width direction. Its leading end is connected to the lower part of the longitudinal guide 42 (first rail 4201 in the longitudinal direction), and its rear end is housed inside the first rail 4001 in the width direction. The second rail 4002 in the width direction is supported so as to be movable in the width direction W of the transport path 110 relative to the first rail 4001 in the width direction by sliding inside the first rail 4001 in the width direction. That is, the second side work platform 24, which is connected to the second rail 4002 in the width direction via a longitudinal guide 42, is supported so as to be movable in the width direction W of the transport path 110 relative to the front work platform 18 on which the first rail 4001 in the width direction is provided.

[0023] The longitudinal guide 42 is provided on the upper surface of the tip of the second rail 4002 in the width direction of the width direction guide 40, and consists of a first longitudinal rail 4201 and a second longitudinal rail 4202 that extend in a direction perpendicular to the second rail 4002 in the width direction, that is, along the longitudinal direction L of the transport path 110. The longitudinal first rail 4201 is installed in pairs on the upper surface of the tip of the widthwise guide 40, spanning two widthwise second rails 4002, with a gap in between that accommodates the second side work platform 24. The longitudinal second rail 4202 is installed in pairs along the entire length of the longitudinal section of the second side work platform 24, at the lower outer surfaces of both ends in the width direction of the second side work platform 18, and passes through the interior of the longitudinal first rail 4201. The longitudinal second rail 4202 is supported so as to be movable in the longitudinal direction L of the transport path 110 relative to the longitudinal first rail 4201 by sliding inside the longitudinal first rail 4201. In other words, the second side work platform 24, to which the longitudinal second rail 4202 is connected, is supported so as to be movable in the longitudinal direction L of the transport path 110 relative to the front work platform 18, which is connected to the longitudinal first rail 4201 via a widthwise guide 40.

[0024] The connecting mechanism 22, configured as described above, supports the two second side work platforms 24 so that they can move between the work position P1 and the retraction position P2. The working position P1 is the state in which the two second side working platforms 24 are extended along the side wall 122, with their tips 20A positioned in the center of the width direction of the side wall 122, as shown in Figure 4(A). The retraction position P2 is a state in which, as shown in Figure 4(C), when viewed from above, the tip 20A is positioned away from the front wall 121 in the longitudinal direction L of the transport path 110, and the location 24A of the second side work platform 24, which is located outside the width direction W of the transport path 110, is positioned on the same plane as the virtual extension surface 122V of the side wall 122, which is located outside the width direction W of the transport path 110, or is positioned inside the width direction W of the transport path 110 compared to the virtual extension surface 122V.

[0025] In other words, the working position P1 is the position where the second side working platform 24 extends along the side wall 122, with the longitudinal guide 42 moved to the outermost part of the transport path 110 in the width direction W of the transport path 110, and the tip 20A of the second side working platform 24 moved in the longitudinal direction L of the transport path 110 by the longitudinal guide 42 so that it is located in the center of the width direction of the side wall 122.

[0026] Furthermore, the retraction position P2 is achieved by moving the second side work platform 24 outward in the longitudinal direction L of the transport path 110 using the longitudinal guide 42, and positioning its tip 20A at a point away from the front wall 121 in the longitudinal direction L of the transport path 110. Then, the longitudinal guide 42 is moved to the innermost point in the width direction W of the transport path 110 relative to the width direction W of the transport path 110, so that the point 24A of the second side work platform 24 located outward in the width direction W of the transport path 110 is on the same plane as the virtual extension surface 122V of the side wall 122 located outward in the width direction W of the transport path 110, or is located inward in the width direction W of the transport path 110 from the virtual extension surface 122V.

[0027] The two second side work platforms 24 and the front work platform 18 are provided with a locking mechanism 46 for fixing the second side work platforms 24 at a desired position in the width direction W of the transport path 110. Specifically, as shown in Figure 5, a through hole 4601 is provided in the first rail 4001 in the width direction, and a female thread 4602 is formed in the second rail 4002 in the width direction. By inserting a screw 46B through the through hole 4601 and screwing the male thread of the screw 46B into the female thread 4602, the second side work platform 24 and the front work platform 18 are fixed together, and the second side work platform 24 is connected to a desired position in the width direction W of the transport path 110.

[0028] Furthermore, the two second side work platforms 24 are provided with a locking mechanism 48 for fixing the second side work platforms 24 at a desired position in the longitudinal direction L of the transport path 110. Specifically, as shown in Figure 5, an insertion hole 4801 is provided in the longitudinal first rail 4201, and a female thread 4802 is formed in the longitudinal second rail 4202. By inserting a screw 48B through the insertion hole 4801 and screwing the male thread of the screw 48B into the female thread 4802, the second side work platform 24 is fixed, and the second side work platform 24 is connected to a desired position in the longitudinal direction L of the transport path 110. Furthermore, various conventionally known coupling structures can be used for the locking mechanism.

[0029] Furthermore, the two second side work platforms 24 are provided with scaffolding coupling parts that can be switched between a coupled state in which the relative movement of the adjacent tip 20A at the work position P1 is made impossible, and a released state in which the coupling is released. The scaffolding connection in this embodiment consists of two flanges and a screw.

[0030] In other words, flanges (not shown) that protrude in the longitudinal direction L of the transport path 110 are attached to the tips 20A of the two second side work platforms 24, and when the work position P1 is reached with the tips 20A positioned in the center of the width direction of the side wall 122, the flanges overlap each other. Then, an insertion hole is formed in the upper flange of the overlapping flanges, and a female thread is formed in the lower flange. By inserting the screw from above the overlapping flanges, through the insertion hole, and screwing it into the female thread, the two side work platforms 24 are joined at their tips 20A. Furthermore, various conventionally known connection structures can be used for the scaffolding connection points.

[0031] Furthermore, at the work positions P1 of the two second side work platforms 24, at points where they are close to each other (the tips 20A), and at the points where the second side work platforms 24 are connected to the front work platform 18, openable and closable doors 28 (28A, 28B) are provided, and handrails 30 for fall prevention are provided at the remaining points excluding the areas where the doors 28 are provided.

[0032] When the two second side work platforms 24 are moved to the work position P1, the worker opens the door 28B, connects the ends 20A of the second side work platforms 24 with the scaffolding connectors to stabilize them, opens the door 28A located at the ends 20A, and then begins work. On the other hand, when work is completed, the worker releases the scaffolding connection and closes door 28A, then returns to the front work scaffolding 18 and closes door 28B, moving the two second side work scaffoldings 24 apart from each other in the longitudinal direction L of the transport path 110, and moves from work position P1 to evacuation position P2.

[0033] At the lower part of the mast 14, a support section 50 for a liftable scaffolding is provided, which is connected to the lower end of the mast 14. The support section 50 is provided with a movable section 32 for movably supporting the liftable scaffolding 10 and an installation section 34 for installing the liftable scaffolding 10 at an appropriate location.

[0034] The movable section 32 comprises a movable frame 3201 which is elongated in the longitudinal direction of the front work platform 18, formed from pipe material into a rectangular frame shape and connected by reinforcing pipes at intervals in the longitudinal direction, and rolling wheels 3202 which consist of casters provided on the movable frame 3201. The installation section 34 is provided with multiple installation legs 3401 that are vertically adjustable and attached to multiple locations on the movable frame 3201, supporting the movable frame 3201 while it is suspended above the ground. In a plan view, mast 14 is erected from the center of the movable frame 3201.

[0035] Next, the assembly procedure for the elevating scaffolding 10 of this embodiment will be described. First, the installation position is determined on the ground in front of the front wall 121 of the bridge pier 120 to be renovated, and the area is protected with steel plates 52. The movable frame 3201 is moved to the installation position using the rolling wheels 3202, and the support section 50 is installed by fixing it with multiple installation legs 3401.

[0036] A drive unit 16 is installed on the upper part of the support unit 50, the floor of the front work platform 18 is installed on the upper part of the drive unit 16, and the floors of a pair of first side work platforms 20 are connected to the longitudinal ends of the front work platform 18. At this time, a second side work platform 24, which serves as the first side work platform 20, is connected to one end of the front work platform 18 on the side adjacent to the transport route (side road 210) of another elevated bridge 200 by a connecting mechanism 22, bringing it to the retraction position P2 (see Figure 3). In addition, a first side work platform 20, which extends along the side wall 122 and is immovable, is connected to the other end of the front work platform 18.

[0037] Handrails 30 and doors 28 are attached to the front work platform 18 and the pair of first side work platforms 20 where necessary. Then, the frame is connected along the front wall 121 from the support section 50 to the top of the bridge pier 120, and the mast 14 is attached. At this time, in order to prevent tipping, the mast 14 is attached to the joints provided at predetermined intervals on the front wall 121 via wall ties (not shown).

[0038] Next, we will explain how to use the elevating scaffolding 10 of this embodiment when carrying out renovation work. First, when carrying out renovation work, workers board the front work platform 18, and as shown in Figure 3, the drive unit 16 raises the front work platform 18 and the pair of first side work platforms 20 to the desired position.

[0039] Next, as shown in Figure 2, the widthwise guide 40 of the connecting mechanism 22 moves the second side work platform 24 relative to the front work platform 18 in the widthwise direction W of the transport path 110, and then fixes it in place with the locking mechanism 46. Next, as shown in Figure 1, the longitudinal guide 42 of the connecting mechanism 22 moves the second side work platform 24 in the longitudinal direction L of the transport path 110 relative to the front work platform 18 to position it at the work location, and then fixes it in place with the locking mechanism 48. Then, doors 28B and 28A are opened, and the ends 20A of the second side work scaffolding 24 are joined together at the scaffolding joint to create the work position P1.

[0040] As shown in Figure 1, when the two second side work platforms 24 are positioned at work location P1, the pair of segmented scaffolding 12 are arranged in a continuous manner to surround the bridge pier 120. In this configuration, workers can carry out repair work on the entire circumference of the bridge pier 120 by walking on the front work platform 18 and the pair of first side work platforms 20 (second side work platforms 24). Upon completion of the renovation work, the second side work scaffolding 24 is moved to the retraction position P2 using the reverse procedure.

[0041] Next, as shown in Figure 7, we will explain how to use the liftable scaffolding 10 when side roads 210 are adjacent to both outer sides in the width direction W of the transport route 110. As shown in Figure 7(A), if the height of the liftable scaffolding 10 is below the height of the side road 210, the second side work scaffolding 24 is moved to the work position P1 to carry out the repair work on the bridge pier 120. In this case, traffic restrictions on the side road 210 are not imposed. As shown in Figure 7(B), if the height of the liftable scaffolding 10 is at the same height as the side road 210, the second side work scaffolding 24 is moved to the evacuation position P2, and the repair work on the bridge pier 120 is carried out. In this case as well, no traffic restrictions are imposed on the side road 210. As shown in Figure 7(C), if the height of the liftable scaffolding 10 is above the side road 210, the second side work scaffolding 24 is moved to the work position P1 to carry out the repair work on the bridge pier 120. In this case, since the second side work scaffolding 24 is located above the side road 210, traffic restrictions will be imposed.

[0042] Thus, if the liftable scaffolding 10 is above the side road 210, traffic restrictions must be implemented. However, if the liftable scaffolding 10 is at the same height as the side road 210, or below the side road 210, it is possible to carry out the bridge pier 120 repair work without traffic restrictions. Therefore, when carrying out renovation work at a height similar to that of the side road 210, the second side work scaffolding 24 must be moved to the retraction position P2 before carrying out the work. However, when carrying out renovation work at other heights, i.e., at heights below and above the side road 210 on the bridge pier 120, the second side work scaffolding 24 can be moved to the work position P1 before carrying out the work. If the liftable scaffolding 10 is above the side road 210 at the end of the work, the liftable scaffolding 10 can be lowered to the ground by moving the second side work scaffolding 24 to the evacuation position P2.

[0043] Furthermore, for example, if there are side roads adjacent to the ground on both outer sides of the width W of the transport route 110, that is, if the side roads are not elevated roads, traffic restrictions must be implemented during work. However, when the work is completed, the second side work platform 24 can be moved to the evacuation position P2 and lowered, so traffic restrictions do not need to be implemented.

[0044] Thus, according to the liftable scaffolding 10 of this embodiment, the connecting mechanism 22 supports the two second side work scaffolding 24 so that they can move between a working position where the tip 20A is positioned in the center of the width direction of the side wall 122, and a retracted position where, when viewed from above, the tip 20A is positioned away from the front wall 121 in the longitudinal direction L of the transport path 110, and the portion 24A of the second side work scaffolding 24 located outside the width direction W of the transport path 110 is positioned on the same plane as the virtual extension surface 122V of the side wall 122 located outside the width direction W of the transport path 110, or is positioned inside the width direction W of the transport path 110 from the virtual extension surface 122V. Therefore, by setting the second side work scaffolding 24 to the retracted position, traffic restrictions on the public road adjacent to the side wall 122 can be lifted, and by setting the second side work scaffolding 24 to the working position, it becomes possible to perform work on the entire circumference of the bridge pier 120. Therefore, even during construction, allowing traffic restrictions to be lifted at the end of work or when scaffolding is being raised or lowered helps to reduce the amount of time traffic is restricted and improves work efficiency.

[0045] Furthermore, even if the bridge piers 120 are spaced apart in the longitudinal direction L of the transport route 110 and spaced apart in the width direction W of the transport route 110 (two in this embodiment), by arranging the two second side work platforms 24 along the side walls 122 of the bridge piers 120 facing outward in the width direction W of the transport route 110, traffic restriction time can be reduced and work efficiency can be improved, which is advantageous in shortening the construction period. Furthermore, since the connecting mechanism 22 is composed of widthwise guides 40 provided at the longitudinal ends of the front work platform 18, and longitudinal guides 42 that are movably connected to each widthwise guide 40 in the width direction W of the transport path 110 and support the second side work platform 24 so as to be movable in the longitudinal direction L of the transport path 110, the connecting mechanism can be provided with a simple configuration, which is advantageous in reducing costs. Furthermore, the two second side work platforms 24 are equipped with scaffolding coupling parts that can be switched between a coupled state in which the relative movement of the adjacent tip 20A at the work position is made impossible, and a released state in which the coupling is released. This configuration allows the two second side work platforms 24 at the work position to be stabilized, which is advantageous in improving work efficiency.

[0046] Furthermore, the ends 20A of the two second side work platforms 24 and the points where the second side work platforms 24 connect to the front work platform 18 are provided with openable and closable doors 28A and 28B. Handrails 30 are provided on the second side work platforms 24 except where the doors 28A and 28B are located. This configuration makes it easier to work on the work platforms and is advantageous in improving work efficiency. Furthermore, since a movable section 32 is provided at the lower part of the mast 14 to movably support the liftable scaffolding 10, it is advantageous to be able to easily move to the next bridge pier 120 when the renovation work on one bridge pier 120 is completed.

[0047] In the elevating scaffolding 10 of the above-described embodiment, two first side work platforms 20, which serve as two second side work platforms 24, are provided at one end of the front work platform 18 in the longitudinal direction. However, in cases such as when there is only one bridge pier 120 and another elevated bridge's transport route (side road 210) is adjacent to both ends of it, the first side work platforms 20 provided at both ends of the front work platform 18 in the longitudinal direction are made into two second side work platforms 24.

[0048] Furthermore, although the bridge piers 120 in the above-described embodiment were provided one at a time in the width direction W of the transport route 110, there may be three or more bridge piers provided in the width direction W of the transport route 110. In this case, two first side work platforms 20 are provided as two second side work platforms 24, which are positioned along the side walls 122 of the bridge pier 120 located at at least one end of the transport route 110 in the width direction W, and facing outward in the width direction W of the transport route 110. In other words, the two first side work platforms 20, which are located on the side wall 122 adjacent to the side road 210, are provided as two second side work platforms 24 connected to the longitudinal ends of the front work platform 18 via a connecting mechanism 22. Therefore, if side roads 210 are provided on both sides of the elevated bridge 100 to be worked on, the two first side work platforms 20 located on the side wall 122 on the side road 210 side of the liftable scaffolding 10 installed on the bridge piers 120 at both ends in the width direction W of the transport route 110 become two second side work platforms 24. [Explanation of Symbols]

[0049] 10. Elevating scaffolding 12-part scaffolding 14 Mast 16 Drive unit 18 Front work scaffolding 20. First side work scaffolding 20A tip 22 Connection mechanism 24. Second side work platform 28 (28A, 28B) Door 30 Handrails 32 Mobile section 34 Installation part 40 Width Direction Guide 4001 First rail in the width direction 4002 Second rail in the width direction 42 Longitudinal guide 4201 Longitudinal first rail 4202 Longitudinal second rail 46, 48 Locking mechanism 50 Support part 52 Steel plates 100 viaduct 110 Transport route 120 bridge piers 121 Front wall 122 Side wall 122V (Virtual extension plane of the side wall) 200 viaduct 210 Side road (transport route) 3201 Moving Frame 3202 Rolling wheels 3401 Installation legs L Longitudinal direction of the transport route W (Wide direction of the transport route)

Claims

1. A liftable scaffolding used for repair work on the piers of an elevated bridge, comprising a transport route and piers supporting the transport route at a high elevation, wherein the piers have a pair of front walls facing the longitudinal direction of the transport route and a pair of side walls facing the width direction of the transport route, The aforementioned elevating scaffolding consists of a pair of separate, segmented scaffolding units arranged on the pair of front walls, Each of the aforementioned segmented scaffolding is, A mast that rises along the aforementioned front wall, A drive unit that moves up and down along the mast, A front work platform installed in the drive unit and extending along the front wall in the width direction of the transport path, The system comprises a pair of first side work platforms connected to both ends in the longitudinal direction of the front work platform and extending along the side wall in the longitudinal direction of the transport path, Of the pair of first side work platforms of the pair of divided scaffolding, two of the first side work platforms provided at at least one end in the longitudinal direction of the front work platform are provided as two second side work platforms connected to one end in the longitudinal direction of the front work platform via a connecting mechanism. The connecting mechanism supports the two second side work platforms so that they can move between a working position in which they extend along the side wall and their ends are positioned in the center of the side wall in the width direction, and a retracted position in which, when viewed from above, the ends of the second side work platforms are positioned away from the front wall in the longitudinal direction of the transport path, and the portion of the second side work platform located outside the transport path in the width direction is positioned on the same plane as the virtual extension plane of the side wall located outside the transport path in the width direction, or is positioned inside the transport path in the width direction of the transport path from the virtual extension plane. A lifting scaffold characterized by the following features.

2. The aforementioned bridge piers are provided in multiple locations at intervals along the longitudinal direction of the transport route and at intervals along the width direction of the transport route. Two first side work platforms, positioned along the side wall of the bridge pier facing outward in the width direction of the transport route, which is located at at least one end of the transport route in the width direction, are provided as two second side work platforms. The lifting scaffolding according to feature 1.

3. The connecting mechanism comprises widthwise guides provided at the longitudinal ends of the front work platform, and longitudinal guides that are movably connected to each of the widthwise guides in the width direction of the transport path and support the second side work platform so as to be movable in the longitudinal direction of the transport path. A lifting scaffold according to claim 1 or 2, characterized by the features described herein.

4. The two second side work platforms are provided with a scaffolding coupling that can be switched between a coupled state in which the leading edges, which are close to each other at the work position, are coupled in a way that prevents relative movement, and a released state in which the coupling is released. A lifting scaffold according to claim 1 or 2, characterized by the features described herein.

5. Doors that can be opened and closed are provided at the ends of the two second side work platforms and at the points where the second side work platforms at the work position are connected to the front work platform, and handrails are provided on the parts of the second side work platforms other than where the doors are provided. A lifting scaffold according to claim 1 or 2, characterized by the features described herein.

6. The lower part of the mast is provided with a movable section that has multiple rolling wheels and supports the liftable scaffolding in a movable manner. A lifting scaffold according to claim 1 or 2, characterized by the features described herein.

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