JP2019143396A - Suspended scaffold and bridge repair method - Google Patents

Abstract

To provide a suspended scaffold which can be used to stably perform work at a high place; which can have its position easily moved; and with which painting work can be performed efficiently to prevent a painting layer of a steel girder from being damaged.SOLUTION: A suspended scaffold 1 comprises: girder locking members 20 which abut and lock on a lower flange 7 of a steel girder 4; a support frame 30 which maintains a distance between the pair of girder locking members and transmits the weight of a scaffolding board to the girder locking members; and a suspension material 11 which suspends and supports the scaffolding board 12. The girder locking members include: traveling wheels 21 traveling on the lower flange; and work time abutting members 23, inserted into the lower side of the traveling wheels, which transmit the weight of the scaffolding board to the steel girder through a flat surface that abuts the top face of the lower flange. Thus, the girder locking members can be switched between a state in which the scaffolding board or the like is supported via the traveling wheels 21, and a state in which support is provided through the flat surface of the work time abutting members.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a suspension scaffold installed for repair and inspection of a bridge, and a bridge repair method using the suspension scaffold.

  Bridges need to be inspected and repaired over time after construction. In order to inspect or repair bridge girders and floor slabs, an operator's scaffolding is required, and suspension scaffolds that suspend and support scaffold boards from bridge girders are widely used. As the bridge made of steel, the bridge girder may be, for example, a structure in which a clamp or the like is attached to a lower flange projecting substantially horizontally from the web of the bridge girder and the scaffolding plate is suspended and supported by a suspension member connected thereto. A clamp that clamps the side edge of the lower flange and tightens with a bolt is generally used, but the weight that can be supported by one clamp is small, and the scaffolding plate is suspended and supported using many clamps and suspension materials. ing.

  On the other hand, Patent Document 1 discloses a suspension scaffold including a roller that travels on the upper surface of a lower flange in order to efficiently assemble and disassemble the suspension scaffold. This suspension scaffold can be assembled and disassembled as follows. On a worktable provided in a limited area, a part of the suspension scaffold between the bridge girder supports is assembled using a mobile lifting jig equipped with a roller. Then, the suspension scaffold is sequentially assembled on the workbench while sending it out in the axial direction of the bridge girder, and the suspension scaffold in the entire span is assembled. The disassembly can be performed in the reverse order, and the disassembly and the suspension scaffold are sequentially moved on the work table.

  Further, for example, Patent Document 2 discloses a suspension scaffold that is provided with a movable suspension scaffold and is moved without being provided throughout the entire span of the bridge. This suspension scaffold suspends and supports a rail from a steel girder via a clamp, and supports a work table via a roller that travels on the rail. Generally, the width of the lower flange of the steel girder varies along the axial direction, and a connecting plate is attached to the upper surface of the connecting portion, and it is often difficult for the roller to travel. For this reason, a separate rail is provided along the steel girder and travels on this rail.

JP 2005-232677 A JP 7-217189 A

However, the conventional suspension scaffold has a problem that the following solutions are desired.
Repair of bridges with steel girders often involves painting of steel girders. When a steel girder is repaired, if a large number of clamps are provided so as to sandwich the lower flange, it is not possible to paint the portion where the clamps are attached. For this reason, another clamp is attached to the adjacent portion and a suspension member is provided separately, and the weight of the scaffolding plate is changed to remove the previously provided clamp and suspension member. Then, the unpainted portion where the clamp was previously provided is painted. The work of remounting the clamp and the suspension material requires a lot of work because there are many suspension materials.

Further, although the clamp sandwiches the lower flange and is tightened with a bolt or the like, the bolt to be tightened may be loosened due to vibration or shaking due to work on the suspension scaffold. For this reason, it is necessary to always check the clamp.
Furthermore, if a clamp or the like is attached to a painted part and tightened strongly, vibrations and vibrations due to work on the suspension scaffold are transmitted to the clamp, and the newly applied paint layer may be damaged.

On the other hand, in the suspension scaffold described in Patent Document 1, it is possible to travel on the lower flange of the steel girder, but it is necessary to fix it so that it does not move during work. For this reason, in addition to the movable suspension jig, a fixed suspension jig using a clamp or the like is provided to change the weight of the scaffold plate. Therefore, a lot of work is required to replace the mobile suspension jig with the fixed suspension jig even in this suspension scaffold.
Also, as described in Patent Document 2, the suspension scaffold that travels on the rail supported by the steel girder also supports the rail using a clamp or the like, and also supports the rail for painting. It is necessary to replace the clamp and the suspension material.

  The present invention has been made in view of the circumstances as described above, and its purpose is a suspension scaffold that can perform work at a high place in a stable state and can easily move its position. Is to provide. As a result, it is possible to efficiently perform the painting operation and to suppress damage to the coating layer applied to the steel beam. Moreover, the repair method of the bridge using this suspension scaffold is provided.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a steel plate having a scaffold plate provided for working at a high place, an upper flange, a lower flange, and a web is projected on both sides from the web. Further, the girder locking member that is abutted and locked on the lower flange and transmits the weight of the scaffold plate to the steel girder, and the pair of girder locking members locked to the lower flange are coupled, A support frame that holds a distance between the two girder locking members and transmits the weight of the scaffold plate to the girder locking member; a suspension member that is connected to the support frame at an upper portion and suspends and supports the scaffold plate The girder locking member has a running wheel that can travel on the lower flange in the axial direction of the steel girder, and a flat surface that comes into contact with the upper surface of the lower flange. And the weight of the scaffold plate through the flat surface A working contact member that can be transmitted to the lower flange, and a state in which the weight of the scaffold plate is transmitted to the steel beam via the traveling wheel that is in contact with the lower flange; There is provided a suspended scaffold that can be switched to a state in which the weight of the scaffold plate is transmitted to the steel beam through the flat surface abutted on.

In this suspension scaffold, the scaffold plate is suspended and supported at a predetermined position with the weight of the scaffold plate supported through the flat surface of the contact member during work, and the repair work is performed in a stable state where the suspension scaffold does not move. Can perform painting work. Then, the suspension scaffold can be moved by easily switching to a state in which the scaffold plate is supported via the running wheel.
In addition, switching between the state where the scaffolding plate is supported by the steel girders via the running wheel and the state where the scaffolding plate is supported via the flat surface of the contact member during work is performed using the same support frame and suspension material. It can be performed by operating the girder locking member while it is used, and can be switched more efficiently than the work of separately providing a clamp and a suspension material and changing the size.
Further, the flat surface of the contact member during operation is in contact with the upper surface of the lower flange, and comes into contact with a wide area. Thereby, the movement of the suspension scaffold can be restrained without being strongly tightened. Therefore, even if it contacts the range where the coating is completed, it is possible to suppress damage to the new coating layer.

  The invention according to claim 2 is the suspension scaffold according to claim 1, wherein the contact member at the time of operation is rotatably mounted on a first support shaft supported by the support frame, The second support shaft supported by the working contact member or the first support shaft is rotatably mounted. The working contact member rotates about the first support shaft, and It is possible to switch between a state in which the flat surface is in contact with the upper surface of the lower flange and a state in which the traveling wheel is in contact with the upper surface of the lower flange. Shall.

  In this suspension scaffold, the scaffold plate is supported by the steel girder via the running wheel easily and quickly by pulling up the girder locking member together with the support frame and rotating the contact member during work around the first support shaft. And a state in which the scaffolding plate is supported through the flat surface of the contact member during work. In a state where the scaffold plate is supported by the steel beam via the running wheel, the weight of the scaffold plate is reduced from the support frame via the first support shaft, the working contact member, the second support shaft, and the running wheel. It is transmitted to the flange and can move on the lower flange by the rotation of the traveling wheel. Further, in a state where the scaffolding plate is supported through the flat surface of the contact member during work, the weight of the scaffold plate is transmitted from the support frame to the lower flange through the first support shaft and the contact member during work. The scaffolding plate is supported in a stable state.

  The invention according to claim 3 is the suspension scaffold according to claim 1, wherein the work contact member of the girder locking member has the upper surface of the lower flange and the traveling in a state where the traveling wheel is pulled upward. A recess that can be inserted between the wheel and is fitted to the traveling wheel and restrains the movement of the traveling wheel behind the flat surface that is in contact with the upper surface of the lower flange. Shall.

  In this suspension scaffold, the traveling wheel is lifted together with the support frame, the working contact member is inserted below the traveling wheel, the flat surface is brought into contact with the lower flange, and the traveling wheel is fitted into the upper recess. Can do. In addition, the fitted contact member at the time of work can pull up the traveling wheel and pull it out from the lower side of the traveling wheel to bring the traveling wheel into contact with the lower flange. As a result, the scaffolding plate is supported by the steel girders via the running wheels that are in contact with the lower flange easily and quickly, and through the flat surface that is in contact with the lower flange of the contact member during operation. Switching to a state in which the scaffolding plate is supported becomes possible. And in a state where a scaffold board is supported via a running wheel, a running board can move a scaffold board with a support frame by running on a lower flange. Further, in a state where the scaffolding plate is supported by the steel girders via the flat surface of the working contact member, the movement of the running wheel is restricted by the working contact member. Then, the flat surface of the contact member at the time of work is brought into contact with the lower flange on the lower side of the traveling wheel, and the work on the scaffold plate can be performed in a stable state.

  The invention according to claim 4 is the suspension scaffold according to any one of claims 1 to 3, wherein the flat surface that is in contact with the upper surface of the lower flange of the contact member at the time of operation is made of steel. It is assumed that a layer made of a material that deforms more flexibly is formed.

  In this suspended scaffold, when the weight of the scaffold plate is supported through the flat surface of the contact member during work, the layer made of a flexible material is in close contact with the upper surface of the lower flange. Thereby, even if it contact | abuts to the part which coating was complete | finished, it is suppressed that a new coating layer is damaged. In addition, the elastically deformable elastic member is in close contact with the upper surface of the lower flange, so that the position of the contact member during operation can be prevented from shifting, and the suspension scaffold is supported in a stable state.

  In the invention according to claim 5, the girder locking members are respectively brought into contact with and locked near both side edges on the lower flange projecting from the web of the steel girder having the upper flange, the lower flange, and the web, The support frame to which the girder locking member is connected holds the distance between the two girder locking members, and the weight of the scaffolding plate is supported by the steel girder via the support frame and the girder locking member, The girder locking member has a running wheel that is capable of running on the lower flange in the axial direction of the steel girder and a flat surface that comes into contact with the upper surface of the lower flange. A state in which the flat surface is brought into contact with the upper surface of the lower flange on the lower side of the traveling wheel, and the weight of the scaffold plate is transmitted to the lower flange through the flat surface. As the steel girders or floor slabs supported by the steel girders The repair work is performed on the scaffold plate, the contact member at the time of the operation is moved from the lower side of the running wheel, and the running wheel is brought into contact with the upper surface of the lower flange and the scaffold plate is interposed via the running wheel. The weight of the steel girder is switched to a state supported by the steel girder, and the steel girder or the floor slab is repaired by moving the suspension scaffold including the girder locking member, the support frame and the scaffolding plate by traveling the front traveling wheel. It is intended to provide a bridge repair method that will continue.

In this repair method, the weight of the scaffold plate is supported through the flat surface of the contact member during work, and repair work and painting work can be performed in a stable state where the suspended scaffold does not move. Then, the suspension scaffold can be moved by efficiently switching to a state in which the scaffold plate is supported via the running wheel. Further, after the movement, it is possible to efficiently return to the state in which the scaffolding plate is supported through the flat surface of the contact member at the time of work, and further work can be performed.
In addition, when working, the flat surface of the contact member at the time of work is in contact with the upper surface of the lower flange on the lower side of the running wheel, so that it touches the lower flange over a large area and restrains the movement of the suspension scaffold without tightening. can do. Therefore, it can suppress that the painting of a lower flange is damaged.

  The invention according to claim 6 is the method of repairing a bridge according to claim 5, wherein the repair work of the steel girder includes a painting work of the steel girder, and the weight of the scaffold plate via the flat surface Is transferred to the lower flange, the coating operation is performed, the weight of the scaffold plate is switched to the state supported by the steel girder via the traveling wheel, the suspension scaffold is moved, and before the movement The region where the flat surface is in contact is painted.

In this repair method, using a stable suspension scaffold, after performing the painting work in a range where the steel girder can be painted, the position where the contact member was in contact with the work was released to the position where it was released. Can move well. And it can coat in the range which the contact member contacted at the time of work before movement, and can paint uniformly in the whole region of a steel beam.
Further, after moving the suspension scaffold, the work contact member can be brought into contact with the painted portion on a flat surface, and damage to a new coating layer is suppressed.

  As described above, the suspension scaffold of the present invention can perform work at a high place in a stable state and can easily move the position. In addition, with this bridge repair method using the suspension scaffold, it is possible to easily move the suspension scaffold and work, especially repairing bridges with steel girder painting efficiently without damaging the paint layer. It becomes possible.

It is a schematic side view which shows the bridge in which the suspension scaffold which is one Embodiment of this invention was installed. It is a schematic sectional drawing of the bridge in which the suspension scaffold shown in FIG. 1 was installed. It is an enlarged front view which shows a part of suspension scaffold shown in FIG. It is the front view and top view which show the girder locking member and support frame which are used with the suspension scaffold shown in FIG. It is the front view and side view of a part of girder locking member and support frame which are shown in FIG. FIG. 5 is a side view showing a state in which the movement of the girder locking member shown in FIG. 4 is restrained, and a side view showing a method of switching from a state in which traveling movement by a running wheel is possible to a state in which movement is restricted. It is the schematic which shows the method of installing the suspension scaffold shown in FIG. It is the front view and arrow view which show a state where it was a part of the girder locking member and support frame of the suspension scaffold which is other embodiment of this invention, and movement was restrained. FIG. 9 is a schematic diagram illustrating a state in which the girder locking member illustrated in FIG. 8 can be moved by a traveling wheel, and a schematic diagram illustrating a method for switching from a state in which the movement is restricted to a state in which the movement is possible. It is the front view and arrow view which show a state which is a part of the girder locking member and supporting frame of a suspension scaffold which are other embodiments of the present invention, and can move. FIG. 11 is a schematic diagram illustrating a state where traveling movement of the girder locking member illustrated in FIG. 10 is constrained and a schematic diagram illustrating a method of switching from a state in which movement is possible to a state in which movement is constrained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view showing a state where a suspension scaffold according to an embodiment of the present invention is suspended from a bridge girder, and FIG. 2 shows a suspension scaffold shown in FIG. 1 and a bridge on which the suspension scaffold is installed. It is a schematic sectional drawing. FIG. 3 is an enlarged front view showing a part of the suspension scaffold shown in FIG.
This suspension scaffold 1 is installed to repair a bridge in which a bridge girder 3 is installed between two abutments 2 and 2.
The bridge girder 3 has a plurality of steel girders 4 having a substantially I-shaped cross section and a concrete floor slab 5 supported thereon. The steel girder 4 has an upper flange 6, a lower flange 7, and a web 8 that connects them up and down. The suspension scaffold 1 has a lower flange 7 that protrudes from the lower end of the steel girder 4 to both sides. Is supported by being suspended.

In this suspension scaffold 1, a plurality of suspension members 11 are attached to each steel girder 4 at predetermined intervals in the axial direction, and the scaffolding plate 12 is supported over substantially the entire width between the branches of the bridge girder 3. .
Each suspension member 11 includes two girder locking members 20 that are respectively locked in the vicinity of both side edges of the lower flange 7 of the steel girder 4, and a support frame 30 that holds a distance between these girder locking members 20. To the lower flange 7 of the steel girder 4. The scaffold plate 12 connected to the lower end of the suspension member 11 and the load acting thereon are transmitted to the lower flange 7 through the support frame 30 and the girder locking member 20.

As shown in FIGS. 4, 5, and 6, each of the girder locking members 20 includes a first support shaft 24 attached to an upper part of a vertical member 31 included in the support frame 30 so as to be substantially horizontal. The working contact member 23 supported rotatably on the first support shaft 24, the two second support shafts 22 supported by the working contact member 23, and the second support shafts 22 And two traveling wheels 21 which are supported so as to be rotatable and can travel on the lower flange.
The first support shaft 24 protrudes from the upper part of the vertical member 31 of the support frame in a direction perpendicular to the axis of the steel beam 4 and opposite to each other from both sides of the steel beam 4.
The working contact member 23 is a steel member having a groove shape in cross section, and includes a flat connecting plate portion 23b and rising portions 23a raised from both side edges of the connecting plate portion. The first support shaft 24 passes through the two rising portions 23a at the substantially central portion in the longitudinal direction, and is supported so as to be rotatable around the first support shaft. Therefore, by rotating the contact member 23 at the time of the work around the first support shaft, the connecting plate portion 23b is on the upper side of the first support shaft 24 and the rising portions 23a on both sides protrude downward. The connecting plate portion 23b is on the lower side of the first support shaft 24, and the rising portion 23a protrudes upward.

  The traveling wheel 21 is supported by two second support shafts 22 which are mounted between the rising portions 23a of the contact member 23 at the time of work and substantially parallel to the first support shaft 24, and these second support shafts. It can be rotated around. And the peripheral surface of the driving | running | working wheel 21 protrudes rather than the starting part 23a in the part by which the cross section used as the groove shape was open | released. Therefore, in a state where the rising portion 23a protrudes below the connecting plate portion 23b, the traveling wheel 21 can abut on the lower flange 7 of the steel beam 4 and travel on the lower flange 7.

The support frame 30 includes two vertical members 31 to which the girder locking member 20 is attached at the upper end, a horizontal member 32 that connects the lower portions of the vertical members 31 and extends substantially in the horizontal direction, and the horizontal members 32. It is attached to the member 32 and has a suspension member connecting portion 33 for connecting to the suspension member 11.
The vertical member 31 and the horizontal member 32 are tubular members having a square cross section made of steel. The horizontal member 32 is inserted into substantially rectangular through holes formed in both the vertical members 31, and a plurality of bolts 34 are inserted. They are joined by passing through both intersections. The two vertical members 31 are parallel to each other and maintained substantially at right angles to the horizontal member 32, and the interval between the two vertical members 31 is set to be slightly larger than the width of the lower flange 7 of the steel girder 4.
The horizontal member 32 has through holes 35 through which bolts 34 for coupling to the vertical member 31 are inserted at a plurality of positions at predetermined intervals in the axial direction. Therefore, the interval between the two vertical members 31 can be changed according to the width of the lower flange 7 by changing the through hole 35 through which the bolt 34 is inserted.

  The first support shaft 24 of the girder locking member 20 passes through the upper end portion of each vertical member 31 and protrudes and is fixed in a direction facing each other. The vertical member 31 is below the steel girder 4 via the working contact member 23 rotatably attached to the first support shaft 24 and the traveling wheel 21 rotatably attached to the work contact member 23. The flange 7 is locked in the vicinity of both side edges. Accordingly, the horizontal member 32 is supported on the lower side of the steel beam 4 in a direction substantially perpendicular to the axial direction of the steel beam 4.

  The suspension member connecting portion 33 is attached to the horizontal member 32 at a substantially central portion where the two vertical members 31 are coupled to the horizontal member 32, and the inner peripheral surface dimension is larger than the outer peripheral surface dimension of the horizontal member 32. However, it has a tubular portion 33a made of slightly larger steel, and a plate-like portion 33b in which a steel plate material having an opening 33c is coupled to the lower surface of the tubular portion 33a. The suspension member connecting portion 33 is supported by inserting a horizontal member 32 inside the tubular portion 33 a, and the position is fixed by a bolt 36 penetrating the tubular portion 33 a and the horizontal member 32. Further, when the interval between the vertical members 31 is changed, the position of the suspension member connecting portion 33 is set on the horizontal member 32 so that the suspension member connecting portion 33 can be fixed at the substantially center between the vertical members. A plurality of bolt holes 37 for fixing are provided.

The suspension member 11 has an upper end portion coupled to the plate-like portion 33b of the suspension member coupling portion 33 through the opening 33c, and the scaffold plate 12 is supported at the lower end portion. As the suspension member 11, a wire, a chain, or the like can be used, and it is desirable that the length can be easily adjusted.
The scaffolding plate 12 can have various structures as long as the scaffolding plate 12 has sufficient strength and rigidity for the operator to work.

  The plurality of support frames 30 arranged in the axial direction of the steel girders 4 are connected to each other using a steel pipe member or the like called a single pipe as the connecting member 14 as shown in FIGS. 1, 2, and 3. . For the connection, as shown in FIG. 3, a connection in which a fastening member 15 a that can be fastened so as to surround the horizontal member 32 of the support frame 30 and a fastening member 15 b that can be fastened so as to surround the connecting member 14 is connected. A clamp 15 can be used. Moreover, it is desirable to connect the connecting member 14 that connects the support frame 30 to each of the plurality of steel girders 4 in a direction that is substantially perpendicular to the steel girders 4 by the lateral connecting member 16.

In such a suspended scaffold 1, the weight of the scaffold plate 12 and the load acting on the scaffold plate are transmitted from the scaffold plate 12 through the suspension member 11, the support frame 30 and the girder locking member 20 to the lower flange 7 of the steel girder 4. Supported by In the state shown in FIGS. 3, 4, and 5, the girder locking member 20 is brought into contact with the lower flange 7 via the traveling wheel 21 and moved in a state where a load or the like is supported via the traveling wheel 21. It is possible.
On the other hand, when the bridge girder repair work or the like is performed on the scaffolding plate 12, it is desirable that the movement of the suspension scaffold 1 is restricted and stable, and the movement is restricted by switching the state of the girder locking member 20. can do.

The work contact member 23 of the girder locking member 20 is attached to the vertical member 31 of the support frame 30 via the first support shaft 24, and rotates around the first support shaft, as shown in FIG. The top and bottom can be reversed. In this state, the traveling wheel 21 supported by the working contact member 23 protrudes upward, and the flat rear surface of the working contact member 23 whose cross-sectional shape is a groove shape is below the traveling wheel 21. Is brought into contact with the upper surface of the lower flange 7. Therefore, a load or the like on the scaffolding plate 12 is supported by the lower flange 7 through the flat surface of the contact member 23 at the time of operation, and the movement is restrained by the frictional force of the contact surface, and a stable state is obtained.
A flat surface on the back surface of the contact member 23 in contact with the lower flange has a contact surface coating layer (not shown) made of a material that is more flexible than steel, such as rubber or synthetic resin. Can be formed. By forming this contact surface coating layer, a pressure contact force acts between the contact member 23 and the lower flange 7 during work in an almost uniform state, and the frictional force is increased to make the contact more stable. It can be made into the state which carried out. In addition, a flexible contact surface coating layer is in contact with the lower flange 7 to prevent the coating layer from being damaged even when the lower flange is coated.

  Switching from the state in which the movement of the girder locking member 20 by the traveling wheels 21 as shown in FIG. 5 to the state in which the movement is restricted as shown in FIG. 6 (a) is shown in FIG. 6 (b). Can be done as follows. That is, a reaction force is applied to the steel beam 4 to lift the support frame 30 upward. Then, the working contact member 23 is reversed around the first support shaft and then lowered to bring the flat surface of the working contact material 23 into contact with the lower flange 7. Since each of the support frames 30 can deform the scaffolding plate 12 or the like, each of them can be lifted alone or a part of a plurality of them can be lifted. The contact member 23 can be sequentially reversed.

Next, the installation method of the said suspension scaffold 1 is demonstrated based on FIG.
As shown in FIG. 7A, a fixed scaffold 13 such as a torii frame is assembled in a predetermined range near the abutment 2 from the ground surface to a height at which the worker reaches the lower flange 7 of the steel girder 4. On this fixed scaffold 13, the support frame 30 and the suspension material 11 a are attached to the lower flange 7 of the steel girder 4 via the girder locking member 20, and the scaffold plate 12 a is suspended and supported to the extent possible by work on the fixed scaffold 13. To do. At this time, the girder locking member 20 is in a state in which movement is restricted. Moreover, the connection member 14 which connects the support frame 30 can also be connected with the bridge girder 3 or the abutment 2 as needed, and can restrain the movement of a horizontal direction.

  In addition to the suspension member 11a that supports the scaffold plate 12a, a separate suspension member 11b is connected to the same support frame 30 at the distal end portion of the installed scaffold plate 12a. The separately provided suspension material 11b is set longer than the suspension plate 12a that is already installed, and the separate suspension material 11b is stretched obliquely downward as shown in FIG. 7B. The scaffold plate 12b of the part to be expanded is suspended and supported in a cantilever manner. Then, in the vicinity of the tip on the newly supported scaffold plate 12b, the support frame 30 and the suspension member 11a are attached to the steel girder 4 via the girder locking member 20, and newly supported as shown in FIG. The scaffold plate 12b is suspended and supported in the vertical direction. Furthermore, by repeating such operations, the range in which the scaffolding plate 12 is suspended and supported can be expanded, and the suspended scaffolding 12 can be installed almost in the range where the scaffolding is necessary, for example, almost all the spans of the bridge girder as shown in FIG. .

  On the suspended scaffolding 1 installed in this way, the operator can repair the concrete floor slab 5 or the steel girder 4. At this time, all of the girder locking members 20 that lock the plurality of suspension members 11 to the steel girder 4 may be in a state in which movement is constrained, but the range in which stability during operation is maintained. In some cases, it is also possible to make a part capable of traveling. And when the repair work of the steel girder 4 includes the painting of the steel girder, it can be performed as follows.

  Through the work on the suspension scaffold 1, all the steel girders can be painted over the entire length, but the upper surface of the lower flange where the girder locking member 20 of the suspension scaffold 1 is in contact can be painted. Can not. Therefore, the entire suspension scaffold 1 is moved in the axial direction of the steel girder 4 after painting other than the position where the girder locking member 20 is in contact. The movement amount may be any distance that is larger than the dimension of the contact member 23 during operation of the girder locking member 20 and that releases the contacted range. For example, the amount of movement can be about 20 cm to 30 cm. Therefore, it is desirable to provide a gap more than the distance corresponding to the amount of movement between the suspension scaffold 1 and the abutment 2 at the end.

In order to move the suspension scaffold 1, the girder locking member 20 is switched to a state in which the traveling wheel 21 can be moved. As shown in FIG. 6B, this switching can be performed by causing the steel girder 4 to bear the load, lifting the support frame 30 by a predetermined amount, and rotating the contact member 23 during work around the first support shaft. . Then, a reaction force is borne on the steel girder 4 or the abutment 2 and the connecting member 14 that connects the plurality of support frames 30 is pulled in a substantially horizontal direction, and a predetermined distance is moved by the rotation of the traveling wheels 21. At this time, connecting members (not shown) oblique to the axial direction of the steel girders 4 are provided so that the support frames 30 locked to all the steel girders 4 move almost simultaneously. It is also possible to suppress relative displacement of the connecting members 14 along.
When the suspension scaffold 1 is moved by a predetermined amount, the position of the lower flange 7 where the girder locking member 20 is in contact during the previous painting is exposed, and this portion can also be painted.

  FIG. 8 is a front view and an arrow view showing a part of a girder locking member and a support frame of a suspension scaffold according to another embodiment of the present invention, and shows a state in which movement is restricted. FIG. 9 is a schematic diagram showing a state in which the same girder locking member can be moved by the traveling wheels, and a schematic diagram showing a method for switching from a state in which the movement is restricted to a state in which the movement is possible. This girder locking member can be used in place of the girder locking member shown in FIGS. 3 to 6, and other configurations of the suspension scaffold of this embodiment are shown in FIGS. 1 to 7. The same suspension scaffold as shown can be used.

  As shown in FIG. 8, the girder locking member 40 used in this suspension scaffold has a traveling wheel 41, a working contact member 42, and a single support shaft 43 attached through the vertical member 31 of the support frame 30. However, they are supported so that they can rotate independently of each other. The working contact member 42 is made of steel, and includes a plate-like portion 42a having a flat back surface and two raised portions 42b raised from both side edges of the plate-like portion 42a. It is what you have. The support shaft 43 penetrates the two rising portions 42b to support the contact member 42 during work, and the traveling wheel 41 is supported between the two rising portions 42b. Therefore, when the plate-like portion 42a of the working contact member is below the traveling wheel 41, the flat surface on the back surface of the plate-like portion 42a is brought into contact with the upper surface of the lower flange 7, and the working contact member is raised. The support frame 30 can be locked to the lower flange 7 via the portion 42 b and the support shaft 43. In such a state, the scaffolding plate is supported through the flat surface of the contact member 42 at the time of work, and the movement is restrained and supported in a stable state.

When the suspension scaffold is moved, the girder locking member 40 is switched to a state in which the traveling wheel 41 is in contact with the upper surface of the lower flange 7 as shown in FIG. At this time, the plate-like portion 42 a of the contact member during operation rotates and moves above the traveling wheel 41, and the position is held by the stopper 44. The stopper 44 is attached to the vertical member 31 of the support frame, and is a rod-shaped member made of steel that protrudes into the rotation region of the contact member 42 at the time of operation. As shown in FIG. The contact member 42 is held at a predetermined position during work.
When the traveling wheel 41 is in contact with the lower flange 7 and the weight of the suspension scaffold is supported via the traveling wheel 41 in this way, the suspension scaffold is moved in the axial direction of the steel beam by the rotation of the traveling wheel 41. Can do.

Switching from the state in which the weight of the suspension scaffold is transmitted to the steel girder via the contact member 42 during work and the movement is restricted to the state in which the traveling wheel 41 is in contact with the lower flange 7 and the suspension scaffold can be moved. Can be done as follows.
As shown in FIG. 9B, the vertical member 31 of the support frame 30 is raised to a predetermined height, and the work contact member 42 is rotated around the support shaft. The stopper 44 holds the plate-like portion 42 a at a position above the traveling wheel 41. In this state, the support frame 30 is lowered, and the traveling wheels 41 are brought into contact with the upper surface of the lower flange 7.
In this way, the operation of raising the support frame 30 and rotating the contact member 42 during work does not raise all the support frames 30 of the suspension scaffold at the same time, but raises each support frame 30 sequentially. Can be done.

  FIG. 10 is a front view and an arrow view showing a part of a girder locking member and a support frame of a suspension scaffold according to another embodiment of the present invention, and shows a state in which traveling by traveling wheels is possible. Is. FIG. 11 is a schematic view showing a state in which the traveling movement of the same girder locking member is constrained and a method of switching from a state in which the movement is possible to a state in which the movement is constrained. This girder locking member can be used in place of the girder locking member shown in FIGS. 3 to 6, and other configurations of the suspension scaffold of this embodiment are shown in FIGS. 1 to 7. The same suspension scaffold as shown can be used.

The girder locking member 50 includes a support shaft 52 that is attached to an upper portion of a vertical member 31 included in the support frame 30 and protrudes in the horizontal direction, and the traveling wheel 51 is supported by the support shaft 52 so as to be rotatable. ing. The work contact member 53, which is a member of the girder locking member and used to restrain the movement by the traveling wheel 51, is a member separated from the support shaft 52 and the traveling wheel 51. As shown, it is not used in a state where traveling is possible.
In this state, the traveling wheel 51 of the girder locking member 50 is brought into contact with the vicinity of the side edge of the upper surface of the lower flange 7 and can be moved in the axial direction of the steel girder by rotating.

As shown in FIG. 11A, the working contact member 53 is a flat surface whose lower surface is in contact with the upper surface of the lower flange 7, and a concave portion 53a in which the traveling wheel 51 is fitted is formed on the upper surface. It is what you have. The concave portion 53a has a cylindrical curved surface with a concave inner surface, and the radius of the cylindrical curved surface is set to be slightly larger than the radius of the traveling wheel 51, and the lower portion of the traveling wheel 51 is almost exactly fitted to the concave portion 53a of the contact member during this operation. It can be fitted together. Therefore, the lower surface is brought into contact with the lower flange 7 by sandwiching the contact member 53 between the traveling wheel 51 and the upper surface of the lower flange 7 and the movement of the traveling wheel 51 fitted to the upper surface is restricted. Is done.
The working contact member 53 is sandwiched between the traveling wheel 51 and the upper surface of the lower flange 7 such as metal, synthetic resin, hard rubber, wood, etc., and the weight of the suspension scaffold acts from the traveling wheel 51. Various materials can be used as long as the shape can be maintained and the weight can be supported.

  When switching from the state in which the traveling by the traveling wheel 51 is possible to the state in which the movement is restrained by such a girder locking member 50, the support frame 30 is lifted upward as shown in FIG. The working contact member 53 is inserted along the upper surface of the lower flange 7 from the side. By fitting the traveling wheel 51 into the recess 53a of the contact member during this operation, the movement can be restricted.

  The suspension scaffold described above is an embodiment of the present invention, and the present invention can be implemented by appropriately changing the shape, structure, dimensions, etc. of each component within the scope. Further, in the description of the method for repairing a bridge using the suspension scaffold of the present invention, the suspension scaffold is provided in almost the entire area between the steel girder supports, and the movement of the steel girder in the axial direction is the contact of the girder locking member. The suspension scaffold according to the present invention is provided only for a part of the span, and is also used when repairing the bridge over the entire span while moving in the axial direction of the steel girder. be able to.

1: Suspended scaffolding, 2: Abutment, 3: Bridge girder, 4: Steel girder, 5: Concrete slab, 6: Upper flange, 7: Lower flange, 8: Web,
11: Suspension material, 12: Scaffolding plate, 13: Fixed scaffold, 14: Connection member, 15: Connection clamp, 16: Lateral connection member,
20: Girder locking member, 21: Traveling wheel, 22: Second support shaft, 23: Working contact member, 23a: Working contact member rising portion, 23b: Working contact member connecting plate , 24: first support shaft,
30: Support frame, 31: Vertical member, 32: Horizontal member, 33: Hanging member connecting part, 33a: Tubular part of hanging member connecting part, 33b: Plate-like part of hanging member connecting part, 33c: Plate-like part 34: a bolt for fixing the vertical member and the horizontal member, 35: a through hole, 36: a bolt for fixing the position of the suspension connecting portion, 37: a through hole,
40: Girder locking member, 41: Traveling wheel, 42: Contact member during operation, 42a: Plate-like portion of the contact member during operation, 42b: Rising portion of the contact member during operation, 43: Support shaft, 44 :stopper,
50: Girder locking member, 51: Traveling wheel, 52: Support shaft, 53: Contact member during operation, 53a: Concave portion on upper surface of contact member during operation

Claims (6)

A scaffolding board provided to perform work at height,
A girder locking member that is abutted and locked on the lower flange projecting on both sides from the web of the steel girder having an upper flange, a lower flange, and a web, and that transmits the weight of the scaffold plate to the steel girder,
A pair of the girder locking members locked to the lower flange are connected, and a support frame for maintaining the distance between the two girder locking members and transmitting the weight of the scaffold plate to the girder locking member; ,
An upper part is connected to the support frame, and has a suspension material that supports the scaffold plate in a suspended manner,
The girder locking member is
A traveling wheel capable of traveling in the axial direction of the steel beam on the lower flange;
A working contact member having a flat surface that is in contact with the upper surface of the lower flange, and capable of transmitting the weight of the scaffolding plate to the steel beam through the flat surface;
A state in which the weight of the scaffold plate is transmitted to the steel girder via the running wheel abutted against the lower flange, and a weight of the scaffold plate via the flat surface abutted against the lower flange The suspension scaffold is characterized in that it can be switched to a state in which is transmitted to the steel girder. The working contact member is rotatably mounted on a first support shaft supported by the support frame,
The traveling wheel is rotatably mounted on the second support shaft or the first support shaft supported by the contact member during the work,
The working contact member rotates around the first support shaft so that the flat surface is in contact with the upper surface of the lower flange on the lower side of the traveling wheel; The suspension scaffold according to claim 1, wherein the suspension scaffold can be switched to a state in which the lower flange comes into contact with the upper surface. The working contact member of the girder locking member can be inserted between the upper surface of the lower flange and the traveling wheel in a state in which the traveling wheel is pulled upward,
2. The suspension according to claim 1, further comprising a recessed portion that is fitted to the traveling wheel and restrains movement of the traveling wheel behind the flat surface that is in contact with the upper surface of the lower flange. scaffold.   The layer which consists of a material which deform | transforms more flexibly than steel is formed in the flat surface contact | abutted by the upper surface of the said lower flange of the said contact member at the time of the said operation | work. The suspension scaffold according to any one of 3 to 3. A girder locking member abuts and locks near both side edges on the lower flange projecting on both sides from the web of the steel girder having an upper flange, a lower flange and a web,
The support frame to which the girder locking member is connected holds the distance between the two girder locking members, and the weight of the scaffolding plate is supported by the steel girder via the support frame and the girder locking member,
The girder locking member has a running wheel that is capable of running on the lower flange in the axial direction of the steel girder and a flat surface that comes into contact with the upper surface of the lower flange. Using a member having,
The steel girder or the steel girder is in a state in which the flat surface is brought into contact with the upper surface of the lower flange on the lower side of the traveling wheel and the weight of the scaffold plate is transmitted to the lower flange through the flat surface. Repair work on the floor slab supported on the scaffolding board,
The contact member at the time of operation is moved from the lower side of the traveling wheel, the traveling wheel is brought into contact with the upper surface of the lower flange, and the weight of the scaffold plate is supported by the steel beam via the traveling wheel. Switch to the state,
A method of repairing a bridge, wherein the repair of the steel girder or the floor slab is continued by moving a suspension scaffold including the girder locking member, the support frame, and the scaffold plate by traveling of a front traveling wheel. The steel girder repair work includes the steel girder painting work,
As a state where the weight of the scaffolding plate is transmitted to the lower flange through the flat surface, the painting operation is performed,
Switch to a state where the weight of the scaffolding plate is supported by the steel girders via the running wheel, and move the suspension scaffold,
6. The method of repairing a bridge according to claim 5, wherein the region in which the flat surface is in contact before moving is painted.

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