JP7033825B2 - How to repair suspended scaffolding and bridges - Google Patents

Description

The present invention relates to a suspended scaffold installed for repairing and inspecting a bridge, and a method for repairing a bridge using the suspended scaffold.

Bridges will need to be inspected and repaired over the years after construction. Workers' scaffolding is required to inspect or repair bridge girders and decks, and suspended scaffolding that suspends and supports scaffolding boards from bridge girders is widely used. In a bridge whose bridge girder is made of steel, for example, a clamp or the like can be attached to a lower flange protruding almost horizontally from the web of the bridge girder, and a scaffolding plate can be suspended and supported by a hanging material connected to the clamp. Clamps that sandwich the side edge of the lower flange and tighten with bolts are 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, in order to efficiently assemble and disassemble the suspended scaffold, Patent Document 1 discloses a suspended scaffold provided with a roller traveling on the upper surface of the lower flange. This suspended scaffold can be assembled and disassembled as follows. On a workbench provided in a limited area, a part of the suspension scaffolding between the spans of the bridge girder is assembled using a mobile suspension jig equipped with rollers. Then, while sending this out in the axial direction of the bridge girder, the suspended scaffolds are sequentially assembled on the workbench, and the suspended scaffolds in the entire span are assembled. Further, the dismantling can be performed in the reverse procedure, and the dismantling and the movement of the suspended scaffolding are sequentially performed on the workbench.

Further, for example, Patent Document 2 discloses that the suspended scaffold is not provided in the entire span of the span of the bridge, but the movable suspended scaffold is provided and the work is performed while moving the scaffold. This suspended scaffold suspends and supports a rail from a steel girder via a clamp, and supports a workbench via a roller running on the rail. Generally, the width of the lower flange of the steel girder fluctuates along the axial direction, and the splicing plate is attached to the upper surface of the connecting portion, which often makes it difficult for the roller to run. For this reason, a separate rail is provided along the steel girder, and the vehicle runs on this rail.

Japanese Unexamined Patent Publication No. 2005-232677 Japanese Unexamined Patent Publication No. 7-217189

However, the conventional suspended scaffold has the following problems that are desired to be solved.
Repairing bridges with steel girders often involves painting the steel girders. When repairing a steel girder, if a large number of clamps are provided so as to sandwich the lower flange, it is not possible to apply paint to the portion to which the clamps are attached. For this reason, another clamp is attached to the adjacent portion and a hanging material is separately provided, and the weight of the scaffolding plate is changed to remove the previously provided clamp and the hanging material. Then, the unpainted portion where the clamp was previously provided is painted. The work of replacing the clamp and the hanging material requires a lot of work due to the large number of hanging materials.

Further, although the clamp sandwiches the lower flange and is tightened with bolts or the like, there is a possibility that the bolts to be tightened may loosen due to vibration or shaking caused by work on the suspended scaffold. Therefore, it is necessary to constantly inspect the clamp.
Further, if a clamp or the like is attached to the painted portion and strongly tightened, vibration or shaking due to the work on the suspended scaffolding is transmitted to the clamp, and the clamp may damage the newly painted coating layer.

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

The present invention has been made in view of the above circumstances, and an object thereof is a suspended scaffold capable of performing work at a high place in a stable state and easily moving the position. Is to provide. Along with this, it is possible to efficiently perform the painting work and to prevent the coating layer applied to the steel girder from being damaged. Further, a method for repairing a bridge using this suspended scaffold is provided.

In order to solve the above problems, the invention according to claim 1 projects on both sides from the web of a scaffolding plate provided for working at a high place and a steel girder having an upper flange, a lower flange and a web. A girder locking member that is abutted and locked on the lower flange and transmits the weight of the scaffolding plate to the steel girder and a pair of the girder locking members locked to the lower flange are connected to each other. A support frame that maintains the distance between both girder locking members and transmits the weight of the scaffolding plate to the girder locking member, and a suspending member whose upper portion is connected to the support frame to suspend and support the scaffolding plate. The girder locking member has a traveling wheel capable of traveling on the lower flange in the axial direction of the steel girder and a flat surface abutting on the upper surface of the lower flange. A working contact member, which can transmit the weight of the scaffolding plate to the steel girder through the flat surface and is rotatably attached to the support frame by a support shaft , is provided. The state in which the weight of the scaffolding plate is transmitted to the steel girder via the traveling wheel abutted on the lower flange, and the flat surface by rotating the abutting member during work around the support shaft. Provides a suspended scaffold that can be switched to a state in which the weight of the scaffold plate is transmitted to the steel girder through the flat surface .

In this suspended scaffold, the scaffolding plate is suspended and supported in a predetermined position while the weight of the scaffolding plate is supported through the flat surface of the contact member during work, and repair work and repair work are performed in a stable state where the suspended scaffolding does not move. Can perform painting work, etc. Then, the suspended scaffold can be moved by easily switching to a state in which the scaffold plate is supported via the traveling wheel.
In addition, the same support frame and suspension material can be used to switch between the state in which the scaffolding plate is supported by the steel girder via the traveling wheel and the state in which the scaffolding plate is supported via the flat surface of the contact member during work. It can be performed by operating the girder locking member while it is in use, and it is possible to switch more efficiently than the work of separately providing a clamp and a suspending material and replacing them.
Further, the flat surface of the contact member during work is brought into contact with the upper surface of the lower flange and comes into contact with a wide area. This makes it possible to restrain the movement of the suspended scaffold without tightening it strongly. Therefore, even if it comes into contact with the area where the coating is finished, it is possible to prevent the new coating layer from being damaged.

According to a second aspect of the present invention, in the suspension scaffold according to the first aspect, the working contact member is rotatably mounted on a first support shaft supported by the support frame, and the traveling wheel has a traveling wheel. The second support shaft supported by the work-time contact member or the first support shaft is rotatably mounted, and the work-time contact member rotates around the first support shaft and is said to be the same. It is possible to switch between a state in which the flat surface on the lower side of the traveling wheel 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. It shall be.

In this suspended scaffold, the scaffold plate is easily and quickly supported by the steel girder via the traveling wheel by pulling up the girder locking member together with the support frame and rotating the working contact member around the first support shaft. It is possible to switch between the state in which the scaffolding plate is supported and the state in which the scaffolding plate is supported via the flat surface of the contact member during work. Then, in a state where the scaffolding plate is supported by the steel girder via the traveling wheel, the weight of the scaffolding plate is lowered from the support frame via the first support shaft, the working contact member, the second support shaft, and the traveling 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 working contact member, the weight of the scaffolding plate is transmitted from the support frame to the lower flange via the first support shaft and the working contact member. The scaffolding board is supported in a stable state.

The invention according to claim 3 abuts on a scaffolding plate provided for working in a high place and on the lower flange protruding from the web of a steel girder having an upper flange, a lower flange and a web. A girder locking member that is locked and transmits the weight of the scaffolding plate to the steel girder and a pair of the girder locking members that are locked to the lower flange are connected to each other. It has a support frame that maintains a gap and transmits the weight of the scaffolding plate to the girder locking member, and a hanging material whose upper portion is connected to the support frame to suspend and support the scaffolding plate. The locking member has a traveling wheel capable of traveling on the lower flange in the axial direction of the steel girder and a flat surface abutting on the upper surface of the lower flange, via the flat surface. The scaffolding plate is provided with a working contact member capable of transmitting the weight of the scaffolding plate to the steel girder, and the weight of the scaffolding plate is transferred to the steel girder via the traveling wheel abutted on the lower flange. It is possible to switch between the state of being transmitted and the state of transmitting the weight of the scaffolding plate to the steel girder through the flat surface abutting on the lower flange, and the girder locking member. The working contact member of the steel can be inserted between the upper surface of the lower flange and the traveling wheel in a state where the traveling wheel is pulled upward, and is brought into contact with the upper surface of the lower flange. It is intended to provide a suspended scaffold having a recess behind a flat surface that fits into the traveling wheel and restrains the movement of the traveling wheel.

In this suspended scaffold, the traveling wheel is pulled up together with the support frame, a working contact member is inserted under 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 be done. Further, the fitted working contact member can be pulled up from the traveling wheel and pulled 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 easily and quickly supported by the steel girder via the traveling wheel abutted on the lower flange, and the flat surface abutted on the lower flange of the abutting member during work. It is possible to switch from the state in which the scaffolding plate is supported. Then, in a state where the scaffolding plate is supported via the traveling wheel, the traveling wheel can move on the lower flange to move the scaffolding plate together with the support frame. Further, in a state where the scaffolding plate is supported by the steel girder through the flat surface of the working contact member, the movement due to the rotation of the traveling wheel is restrained by the working contact member. Then, the flat surface of the contact member during work is brought into contact with the lower flange on the lower side of the traveling wheel, and the work on the scaffold plate becomes possible in a stable state.

According to a fourth aspect of the present invention, in the suspension scaffold according to any one of claims 1 to 3, steel is provided on a flat surface abutting on the upper surface of the lower flange of the working contact member. It is assumed that a layer made of a material that deforms more flexibly is formed.

In this suspended scaffold, a layer of flexible material adheres to the upper surface of the lower flange when the weight of the scaffold plate is supported through the flat surface of the working contact member. As a result, it is possible to prevent the new coating layer from being damaged even if it comes into contact with the portion where the coating has been completed. Further, since the elastic member that flexibly deforms is in close contact with the upper surface of the lower flange, it is possible to prevent the position of the contact member from shifting during work, and the suspended scaffold is supported in a stable state.

In the invention according to claim 5, the girder locking member is abutted and locked near both side edges on the lower flange protruding 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 keeps the space between the 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 includes a traveling wheel capable of traveling on the lower flange in the axial direction of the steel girder, and a flat surface abutting on the upper surface of the lower flange, and the support shaft provides the girder locking member. Using a member having a working contact member rotatably attached to the support frame, 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 flat surface is formed. In a state where the weight of the scaffolding plate is transmitted to the lower flange through the scaffolding plate, the steel girder or the floor slab supported by the steel girder is repaired on the scaffolding plate, and the contact member during the work is supported. The traveling wheel is rotated around an axis to move the working contact member 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 scaffolding plate is reduced through the traveling wheel. The state is switched to the state of being supported by the steel girder, and the suspension scaffold including the girder locking member, the support frame and the scaffolding plate is moved by the traveling of the front traveling wheel to continue repairing the steel girder or the deck. It provides a method of repairing bridges.

In this repair method, the weight of the scaffolding plate is supported through the flat surface of the contact member during work, and the repair work, painting work, and the like can be performed in a stable state in which the suspended scaffold does not move. Then, the suspended scaffold can be moved by efficiently switching to a state in which the scaffold plate is supported via the traveling wheel. Further, after the movement, the scaffolding plate can be efficiently returned to the state of being supported through the flat surface of the contact member during work, and further work can be performed.
In addition, when performing work, the flat surface of the contact member during work abuts on the upper surface of the lower flange on the lower side of the traveling wheel, so that it contacts the lower flange over a wide area and restrains the movement of the suspended scaffold without tightening strongly. can do. Therefore, it is possible to prevent the coating on the lower flange from being damaged.

The invention according to claim 6 is the method for 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 scaffolding plate through the flat surface. Is transmitted to the lower flange, the painting work is performed, the weight of the scaffolding plate is switched to the state of being supported by the steel girder via the traveling wheel, the suspended scaffolding is moved, and before the movement. It is assumed that the area where the flat surface is in contact is painted.

In this repair method, after the painting work is performed on the range where the steel girder can be painted using the suspended scaffolding in a stable state, the efficiency is reached to the position where the position where the contact member was in contact during the work is released. You can move well. Then, it is possible to apply the coating to the area where the contact member was in contact during the work before the movement, and it is possible to apply the coating evenly to the entire area of the steel girder.
Further, after moving the suspended scaffold, the contact member during work can be brought into contact with the painted portion on a flat surface, and damage to the new coating layer is suppressed.

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

It is a schematic side view which shows the bridge which installed the suspension scaffolding which is one Embodiment of this invention. It is a schematic cross-sectional view of the bridge in which the suspension scaffold shown in FIG. 1 is installed. It is an enlarged front view which shows a part of the suspension scaffold shown in FIG. It is a front view and the plan view which show the girder locking member and the support frame used in the suspension scaffold shown in FIG. FIG. 4 is a front view and a side view of a part of the girder locking member and the support frame shown in FIG. FIG. 4 is a side view showing a state in which the movement of the girder locking member shown in FIG. 4 is restricted, and a side view showing a method of switching from a state in which traveling movement by a traveling wheel is possible to a state in which movement is restricted. It is a schematic diagram which shows the method of installing the suspension scaffold shown in FIG. It is a front view and the arrow view which shows the state which is a part of the girder locking member and the support frame of the suspension scaffold which is another embodiment of this invention, and the movement is restrained. FIG. 8 is a schematic diagram showing a state in which the girder locking member can be moved by the traveling wheel, and a schematic diagram showing a method of switching from a state in which movement is restricted to a state in which movement is possible. It is a front view and the arrow view which shows the state which is a part of the girder locking member and the support frame of the suspension scaffold which is another embodiment of this invention, and can move. FIG. 10 is a schematic view showing a state in which the traveling movement of the girder locking member is restricted and a schematic diagram showing a method of switching from a movable state to a restricted movement state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view showing a state in which a suspended scaffold according to an embodiment of the present invention is suspended and supported from a bridge girder, and FIG. 2 shows the suspended scaffold shown in FIG. 1 and a bridge on which the suspended scaffold is installed. It is a schematic cross-sectional view. Further, FIG. 3 is an enlarged front view showing a part of the suspended scaffold shown in FIG.
This suspended scaffold 1 is installed to repair a bridge in which a bridge girder 3 is erected 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 deck 5 supported on the steel girders 4. The steel girder 4 has an upper flange 6, a lower flange 7, and a web 8 connecting them up and down, and the suspension scaffold 1 has a lower flange 7 protruding from the lower end of the web of the steel girder 4 to both sides. It is locked and supported by a flange.

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 scaffold plate 12 is supported in almost the entire width over almost the entire span of the span of the bridge girder 3. ..
Each suspension member 11 has 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 an interval between these girder locking members 20. It is locked to the lower flange 7 of the steel girder 4 via the steel girder 4. The scaffolding plate 12 connected to the lower end of the suspension member 11 and the load acting on the scaffolding plate 12 are transmitted to the lower flange 7 via 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 has a first support shaft 24 attached to the upper portion of the vertical member 31 of the support frame 30 so as to be substantially horizontal. A working contact member 23 rotatably supported by the first support shaft 24, two second support shafts 22 supported by the working contact member 23, and these second support shafts 22. It is equipped with two traveling wheels 21 that are rotatably supported and can travel on the lower flange.
The first support shaft 24 projects from the upper portion of the vertical member 31 of the support frame in a direction perpendicular to the axis of the steel girder 4 and from both sides of the steel girder 4 in a direction facing each other.
The working contact member 23 is a steel member having a groove-shaped cross section, and includes a flat plate-shaped connecting plate portion 23b and a rising portion 23a raised from both side edges of the connecting plate portion. Then, the first support shaft 24 penetrates the two rising portions 23a at a substantially central portion in the longitudinal direction, and is rotatably supported around the first support shaft. Therefore, by rotating the contact member 23 during 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 can be set to be on the lower side of the first support shaft 24 and the rising portion 23a can be set to protrude upward.

The traveling wheel 21 is supported by two second support shafts 22 mounted substantially parallel to the first support shaft 24 between both rising portions 23a of the working contact member 23, and these second support shafts are supported. It is possible to rotate around. Then, the peripheral surface of the traveling wheel 21 protrudes from the rising portion 23a at the open portion of the groove-shaped cross section. Therefore, in a state where the rising portion 23a protrudes below the connecting plate portion 23b, the traveling wheel 21 abuts on the lower flange 7 of the steel girder 4 and can travel on the lower flange 7.

The support frame 30 includes two vertical members 31 to which a girder locking member 20 is attached to an upper end portion, a horizontal member 32 that connects the lower portions of these vertical members 31 and is bridged in a substantially horizontal direction, and the horizontal member 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 made of steel and having a square cross-sectional shape. The horizontal member 32 is inserted into a substantially rectangular through hole formed in both vertical members 31, and a plurality of bolts 34 are inserted. It is connected by penetrating both intersections. The two vertical members 31 are maintained parallel to each other and substantially at right angles to the horizontal member 32, and the distance 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 is provided with through holes 35 through which bolts 34 for connecting to the vertical member 31 are inserted at a plurality of positions at predetermined intervals in the axial direction. Therefore, by changing the through hole 35 through which the bolt 34 is inserted, the distance between the two vertical members 31 can be changed according to the width of the lower flange 7.

The first support shaft 24 of the girder locking member 20 penetrates through the upper end of each vertical member 31, and is fixed so as to project in a direction facing each other. The vertical member 31 is under 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 working contact member 23. It is locked near both side edges of the flange 7. As a result, the horizontal member 32 is supported on the lower side of the steel girder 4 in a direction substantially perpendicular to the axial direction of the steel girder 4.

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

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

As shown in FIGS. 1, 2, and 3, the plurality of support frames 30 arranged in the axial direction of the steel girder 4 are connected to each other by using a steel pipe member or the like called a single pipe as the connecting member 14. .. In the connection, as shown in FIG. 3, a tightening member 15a that can be tightened so as to surround the horizontal member 32 of the support frame 30 and a tightening member 15b that can be tightened so as to surround the connecting member 14 are connected. Clamp 15 can be used. Further, it is desirable that the connecting member 14 connecting the support frame 30 for each of the plurality of steel girders 4 is connected by the lateral connecting member 16 in a direction substantially perpendicular to the steel girder 4.

In such a suspension scaffold 1, the weight of the scaffold plate 12 and the load acting on the scaffold plate are transferred from the scaffold plate 12 to the lower flange 7 of the steel girder 4 via the suspension member 11, the support frame 30, and the girder locking member 20. Supported by. In the states shown in FIGS. 3, 4 and 5, the girder locking member 20 is in contact with the lower flange 7 via the traveling wheel 21, and the movement is carried out in a state where the load or the like is supported via the traveling wheel 21. It is possible.
On the other hand, when repairing the bridge girder on the scaffolding plate 12, it is desired that the movement of the suspended scaffolding 1 is restrained and kept in a stable state, and the movement is restrained by switching the state of the girder locking member 20. can do.

The working 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 24 to be shown in FIG. It can be turned upside down like this. In this state, the traveling wheel 21 supported by the working contact member 23 protrudes upward, and the flat back surface of the working contact member 23 having a grooved cross-sectional shape is the lower side of the traveling wheel 21. Is in contact with the upper surface of the lower flange 7. Therefore, the 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 during work, and the movement is restrained by the frictional force of the contact surface, resulting in a stable state.
The flat surface on the back surface of the working contact member 23 that is in contact with the lower flange is a contact surface covering layer made of a material that is more flexibly deformed than steel such as rubber and synthetic resin (not shown). Can be formed. By forming this contact surface covering layer, a pressure contact force acts between the contact member 23 and the lower flange 7 in a nearly uniform state during work, and the frictional force is increased to make it more stable. It can be in a state of being. Further, a flexible contact surface covering layer is brought into contact with the lower flange 7 to prevent the coating layer from being damaged even when the lower flange is coated.

The switching from the state in which the girder locking member 20 can be moved by the traveling wheel 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 like this. That is, a reaction force is applied to the steel girder 4 to pull up the support frame 30 upward. Then, the working contact member 23 is inverted around the first support shaft and then lowered to bring the flat surface of the working contact member 23 into contact with the lower flange 7. Since the scaffolding plate 12 and the like can be deformed in each of the support frames 30, each of them can be lifted individually or a part of a plurality of them, and when the girder locking member 20 provided with a large number is working. The contact member 23 can be sequentially inverted.

Next, the method of installing the suspended scaffold 1 will be described with reference to FIG. 7.
As shown in FIG. 7 (a), the fixed scaffold 13 by the torii frame or the like is assembled from the ground surface to the height where the worker can reach the lower flange 7 of the steel girder 4 in a predetermined range near the abutment 2. On the fixed scaffold 13, the support frame 30 and the suspension member 11a are attached to the lower flange 7 of the steel girder 4 via the girder locking member 20, and the scaffold plate 12a is suspended and supported to the extent possible by the work on the fixed scaffold 13. do. At this time, the girder locking member 20 is kept in a state where the movement is restrained. Further, the connecting member 14 connecting the support frame 30 may be connected to the bridge girder 3 or the abutment 2 to restrain the movement in the horizontal direction, if necessary.

At the tip portion of the installed scaffolding plate 12a, in addition to the suspending material 11a that supports the scaffolding plate 12a, another suspending material 11b is connected to the same support frame 30. The separately provided suspension material 11b is set longer than the one that suspends and supports the already installed scaffolding plate 12a, and as shown in FIG. 7B, the separately provided suspension material 11b is stretched diagonally downward. The scaffolding plate 12b of the part to be expanded is suspended and supported in a cantilever shape. Then, near the tip of the newly supported scaffolding 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 are newly supported as shown in FIG. 7 (c). The scaffolding plate 12b is suspended and supported in the vertical direction. Further, by repeating such work, the range in which the scaffolding plate 12 is suspended and supported can be expanded, and the suspended scaffolding 12 can be installed in a range where the scaffolding is required, for example, almost the entire area between the spans of the bridge girder as shown in FIG. ..

On the suspended scaffolding 1 installed in this way, the worker can repair the concrete deck 5 or the steel girder 4. At this time, the girder locking member 20 for locking the plurality of suspending members 11 to the steel girder 4 may be kept in a state where the movement is restricted, but the stability during work is maintained. It is also possible to keep some of them in a state where they can travel. Then, when the repair work of the steel girder 4 includes painting of the steel girder, the following can be performed.

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

To move the suspended scaffold 1, the girder locking member 20 is switched to a state in which it can be moved by the traveling wheel 21. This switching can be performed by bearing the steel girder 4 on the steel girder 4 as shown in FIG. 6B, 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 applied to the steel girder 4 or the abutment 2 to pull the connecting member 14 connecting the plurality of support frames 30 in a substantially horizontal direction, and the traveling wheel 21 is rotated to move a predetermined distance. At this time, a connecting member (not shown) diagonal to the axial direction of the steel girder 4 is provided so that the support frames 30 locked to all the steel girders 4 move almost simultaneously, and each steel girder 4 is provided with a connecting member (not shown). It is also possible to suppress the relative displacement of the connecting member 14 along the line.
When the suspended scaffold 1 is moved by a predetermined amount, the position of the lower flange 7 that the girder locking member 20 was in contact with at the time of 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 suspended scaffold according to another embodiment of the present invention, and shows a state in which movement is restricted. Further, FIG. 9 is a schematic view showing a state in which the same girder locking member can be moved by the traveling wheel, and a schematic view showing a method of switching from a state in which movement is restricted to a state in which 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 suspended scaffold of the present embodiment are shown in FIGS. 1 to 7. Similar to the suspended scaffolding shown can be used.

As shown in FIG. 8, the girder locking member 40 used in this suspended scaffold has a traveling wheel 41 and a working contact member 42 on one 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 has a plate-shaped portion 42a having a flat back surface and two rising portions 42b raised from both side edges of the plate-shaped portion 42a. Have. The support shaft 43 penetrates the two raising portions 42b to support the contact member 42 during work, and the traveling wheel 41 is supported between the two raising portions 42b. Therefore, when the plate-shaped portion 42a of the working contact member is below the traveling wheel 41, the flat surface on the back surface of the plate-shaped portion 42a abuts on the upper surface of the lower flange 7 to raise the working contact member. The support frame 30 can be locked to the lower flange 7 via the portion 42b and the support shaft 43. In such a state, the scaffolding plate is supported through the flat surface of the contact member 42 during work, and the scaffolding plate is supported in a stable state while the movement is restrained.

When the suspended 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. 9A. At this time, the plate-shaped portion 42a of the contact member during work rotates and moves above the traveling wheel 41, and the position is held by the stopper 44. The stopper 44 is a rod-shaped member made of steel that is attached to the vertical member 31 of the support frame and protrudes into the rotational region of the contact member 42 during work, and as shown in FIG. 9A, a rotational moment due to gravity acts on the stopper 44. The contact member 42 during work is held at a predetermined position.
In a state where the traveling wheel 41 is in contact with the lower flange 7 and the weight of the suspended scaffold is supported via the traveling wheel 41, the suspension scaffold is moved in the axial direction of the steel girder by the rotation of the traveling wheel 41. Can be done.

The weight of the suspended scaffold is transmitted to the steel girder via the contact member 42 during work, and the traveling wheel 41 is brought into contact with the lower flange 7 to switch from the state where the movement is restricted to the state where the suspended 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 contact member 42 during work is rotated around the support axis. Then, the plate-shaped portion 42a is held at a position above the traveling wheel 41 by the stopper 44. In this state, the support frame 30 is lowered to bring the traveling wheel 41 into contact with the upper surface of the lower flange 7.
In this way, the work of raising the support frame 30 to rotate the contact member 42 during work does not raise all the support frames 30 of the suspended scaffolding all at once, but raises each support frame 30 in sequence. 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 suspended scaffold according to another embodiment of the present invention, and shows a state in which traveling by a traveling wheel is possible. It is a thing. Further, FIG. 11 is a schematic view showing a method of switching from a state in which the traveling movement of the same girder locking member is restrained and a state in which the movement is possible to a state in which the movement is restrained. 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 suspended scaffold of the present embodiment are shown in FIGS. 1 to 7. Similar to the suspended scaffolding shown can be used.

The girder locking member 50 includes a support shaft 52 that is attached to the upper part of the vertical member 31 included in the support frame 30 and protrudes in the horizontal direction, and the traveling wheel 51 is rotatably supported by the support shaft 52. ing. The working contact member 53, which is a member of the girder locking member and is 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 it can run.
In this state, the traveling wheel 51 of the girder locking member 50 is in contact with the vicinity of the side edge of the upper surface of the lower flange 7 and rotates so that the steel girder can move in the axial direction.

As shown in FIG. 11A, the working contact member 53 has a flat surface whose lower surface is in contact with the upper surface of the lower flange 7, and has a recess 53a on which the traveling ring 51 is fitted. It has. The concave portion 53a has a cylindrical curved surface having a concave inner surface, the radius of the cylindrical curved surface is set to be slightly larger than the radius of the traveling ring 51, and the lower portion of the traveling ring 51 is almost exactly the recess 53a of the contact member during this work. It is something that can be fitted. Therefore, by sandwiching the contact member 53 during work between the traveling wheel 51 and the upper surface of the lower flange 7, the lower surface is brought into contact with the lower flange 7, and the movement of the traveling wheel 51 fitted to the upper surface is restrained. Will be done.
Even if the contact member 53 during work is sandwiched between the traveling wheel 51 and the upper surface of the lower flange 7 of metal, synthetic resin, hard rubber, wood, etc., and the weight of the suspended scaffold acts on the traveling wheel 51. Various materials can be used as long as they can maintain the shape and support the weight.

When switching from a state in which traveling by the traveling wheel 51 to a state in which movement is restricted by such a girder locking member 50, the support frame 30 is lifted upward and sideways as shown in FIG. 11 (b). 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 work, the movement can be restrained.

The suspended scaffold described above is an embodiment of the present invention, and the present invention can be carried out by appropriately changing the shape, structure, dimensions, etc. of each configuration within the range. Further, in the method described as the bridge repair method using the suspended scaffold of the present invention, the suspended scaffold is provided in almost the entire span between the spans of the steel girder, and the movement of the steel girder in the axial direction is the contact of the girder locking member. Although this is done to change the position, the suspension scaffold of the present invention is provided only in 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 deck, 6: Upper flange, 7: Lower flange, 8: Web,
11: Suspension material, 12: Scaffolding plate, 13: Fixed scaffolding, 14: Connecting member, 15: Connecting clamp, 16: Lateral connecting member,
20: Girder locking member, 21: Traveling wheel, 22: Second support shaft, 23: Working contact member, 23a: Starting part of working contact member, 23b: Connecting plate part of working contact member , 24: First support shaft,
30: Support frame, 31: Vertical member, 32: Horizontal member, 33: Hanging material connecting part, 33a: Tubular part of hanging material connecting part, 33b: Plate-shaped part of hanging material connecting part, 33c: Provided in plate-shaped part Opening, 34: Bolt for fixing vertical member and horizontal member, 35: Through hole, 36: Bolt for fixing the position of suspension material connecting part, 37: Through hole,
40: Girder locking member, 41: Traveling wheel, 42: Working contact member, 42a: Plate-shaped part of working contact member, 42b: Raising part of working contact member, 43: Support shaft, 44 :stopper,
50: Girder locking member, 51: Traveling wheel, 52: Support shaft, 53: Working contact member, 53a: Recess on the upper surface of the working contact member

Claims (6)

Scaffolding boards provided for working in high places,
A girder locking member that abuts on and locks on the lower flange of a steel girder having an upper flange, a lower flange, and a web and projects from the web to both sides, and transmits the weight of the scaffolding plate to the steel girder.
A support frame in which a pair of girder locking members locked to the lower flange are connected to maintain a distance between the girder locking members and transmit the weight of the scaffolding plate to the girder locking member. ,
The scaffolding plate is connected to the support frame with an upper portion, and has a suspension material for suspending and supporting the scaffolding plate.
The girder locking member
A traveling wheel capable of traveling on the lower flange in the axial direction of the steel girder, and a traveling wheel.
It has a flat surface that comes into contact with the upper surface of the lower flange, and the weight of the scaffolding plate can be transmitted to the steel girder through the flat surface, and the support shaft rotates the support frame to the support frame. Equipped with a working contact member, which is capable of being attached ,
A state in which the weight of the scaffolding plate is transmitted to the steel girder via the traveling wheel abutted on the lower flange, and the flat surface by rotating the abutting member during work around the support shaft. The suspension scaffolding is characterized in that the weight of the scaffolding plate can be switched to a state in which the weight of the scaffolding plate is transmitted to the steel girder through the flat surface . The working contact member is rotatably mounted on a first support shaft supported by the support frame.
The traveling wheel is rotatably mounted on a second support shaft supported by the working contact member or the first support shaft.
The working contact member rotates around the first support shaft, and the flat surface under the traveling wheel is in contact with the upper surface of the lower flange, and the traveling wheel is in contact with the upper surface of the lower flange. The suspended scaffold according to claim 1, wherein the state can be switched to a state of being in contact with the upper surface of the lower flange. Scaffolding boards provided for working in high places,
A girder locking member that abuts on and locks on the lower flange of a steel girder having an upper flange, a lower flange, and a web and projects from the web to both sides, and transmits the weight of the scaffolding plate to the steel girder.
A support frame in which a pair of girder locking members locked to the lower flange are connected to maintain a distance between the girder locking members and transmit the weight of the scaffolding plate to the girder locking member. ,
The scaffolding plate is connected to the support frame with an upper portion, and has a suspension material for suspending and supporting the scaffolding plate.
The girder locking member
A traveling wheel capable of traveling on the lower flange in the axial direction of the steel girder, and a traveling wheel.
A working contact member having a flat surface abutting on the upper surface of the lower flange and capable of transmitting the weight of the scaffolding plate to the steel girder through the flat surface.
The weight of the scaffolding plate is transmitted to the steel girder through the traveling wheel abutted on the lower flange, and the weight of the scaffolding plate is transmitted through the flat surface abutting on the lower flange. Can be switched to the state in which is transmitted to the steel girder.
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 where the traveling wheel is pulled upward.
A suspension scaffold characterized in that behind the flat surface abutting on the upper surface of the lower flange, a recess that is fitted to the traveling wheel and restrains the movement of the traveling wheel is provided. Claim 1 to claim 1, wherein a layer made of a material that deforms more flexibly than steel is formed on a flat surface that is in contact with the upper surface of the lower flange of the working contact member. Suspended scaffolding described in any of up to 3. A girder locking member is abutted and locked near both edges on the lower flange protruding 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 keeps the space between the 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 includes a traveling wheel capable of traveling on the lower flange in the axial direction of the steel girder, and a flat surface abutting on the upper surface of the lower flange, and the support shaft provides the girder locking member. Using a working contact member that is rotatably attached to the support frame ,
The steel girder or the steel girder is in a state where the flat surface is in contact with the upper surface of the lower flange on the lower side of the traveling wheel and the weight of the scaffolding plate is transmitted to the lower flange through the flat surface. Repair work of the floor slab supported by is performed on the scaffolding board,
The working contact member is rotated around the support shaft to move the working contact member from the lower side of the traveling wheel, and the traveling wheel is brought into contact with the upper surface of the lower flange to bring the traveling wheel into contact with the upper surface of the lower flange. The weight of the scaffolding plate is switched to the state of being supported by the steel girder via the
A method for repairing a bridge, which comprises moving a suspended scaffold including the girder locking member, the support frame, and the scaffolding plate by traveling of the front traveling wheel to continue repairing the steel girder or the floor slab. The repair work of the steel girder includes painting work of the steel girder.
The painting work was performed in a state where the weight of the scaffolding plate was transmitted to the lower flange through the flat surface.
The weight of the scaffolding plate is switched to a state of being supported by the steel girder via the traveling wheel, and the suspended scaffolding is moved.
The method for repairing a bridge according to claim 5, wherein the area where the flat surface is in contact is painted before the movement.

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