JPH042176Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a bridge that is mounted on the railing of a maintenance walkway provided below the deck slab of a suspension bridge or other bridge. This relates to portable scaffolding for bridge maintenance to inspect or repair bridges.

[Prior art]

Conventionally, in order to perform maintenance work such as inspecting or repairing the deck slab of a suspension bridge and the horizontal and vertical girders that support it, a passage slab 11 is used as shown in Fig. 17.
A maintenance passageway 14 consisting of a railing and railings 12 and 13 fixed on both sides is arranged so as to extend in the bridge axis direction below the main groove upper chord member 17 of the suspension bridge 16 supported by the suspension bridge cable 15. A suspension bridge with a maintenance passageway is known in which both side portions of the passageway slab 11 in the maintenance passageway 14 are connected to each main groove upper chord member 17 via suspension rods 18.

[Problem that the invention attempts to solve]

However, in the case of the conventional suspension bridge with a passage for maintenance, the road steel deck 19 and the cross beams 20 and longitudinal girders 21 that support it are located at a considerably higher position than the passage slab 11 (for example, from the top surface of the passage slab 11). Steel deck 19
Since the height to the bottom surface of the steel deck is approximately 3.5 m), there is a problem in that workers cannot approach the steel deck slab 19, cross beams 20, and vertical beams 21 to perform maintenance work such as observation points or repairs.

[Purpose of the invention, structure]

The purpose of this invention is to provide a portable scaffold for bridge maintenance that advantageously solves the above-mentioned problems and also has other excellent effects.The gist of this invention is to: On one side of the base 4 of the scaffold 3 having the scaffold board 1 and the enclosure frame 2,
A horizontal opening engagement groove 6 is provided which is fitted from the side to one of the handrails 5 in the maintenance passage, and a groove 6 is provided in the lower part of the other side of the base 4, and an engagement groove 6 is provided in the lower part of the other side of the base 4. A downward-opening engagement groove 8 is provided in which the downward-opening engagement groove 8 is fitted, and a locking member 10 for preventing detachment for opening and closing the opening of the downward-opening engagement groove 8 is provided on the groove side wall portion 9 of the downward-opening engagement groove 8. A portable scaffold for bridge maintenance is characterized by:

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

1 to 14 show a portable scaffold for bridge maintenance according to an embodiment of this invention,
A scaffolding material 23 made of a wire mesh is fixed to a rectangular metal frame 22 by welding or the like to constitute a base 4, and an intermediate support made of a vertical metal pipe is installed at the center of the frame rods on both the front and back sides of the frame 22. 24
The lower ends of side struts 25 made of vertical metal tubes are fixed by welding to the left and right sides of the frame rods on both the front and rear sides, and the lower ends of side struts 25 made of vertical metal tubes are fixed by welding. Horizontal scaffolding plate support rods 26 are installed at the same level in the middle part and fixed by welding, and side connecting rods each having a U-shape in plan are installed at the upper end of each side support 25 facing in the front-rear direction. The end portion of 27 is fixed by welding.

A rotating fence rod 28 is attached to the upper end of one side support 25.
One end of the intermediate strut 24 is pivotally connected to a support shaft 29 extending in the front-rear direction, and the upper end of the intermediate strut 24, which faces the side of the one side strut 25, has a semi-cylindrical support portion at the lower tip thereof. 30 is fixed by welding, and a locking shaft 32 is slidably inserted into the tip of the rotating fence rod 28 and fixed to the locking shaft 32. The operating handle 33 is passed through a slit 34 provided on the tip side of the rotating fence rod 28, and the locking shaft 32 is made to protrude from the rotating fence rod 28 and is fitted and placed on the semi-cylindrical support portion 30. Then,
When the rotating fence rod 28 is held in a horizontal state between the side struts 25 and the intermediate struts 24, and the locking shaft 32 is pulled into the rotating fence rod 28 and removed from the semi-cylindrical support portion 30, The rotating fence rod 28 can be rotated downward and hung down.

A connecting rod 35 extending in the left-right direction is installed at the upper end between the intermediate strut 24 and the side struts 25 where the rotating fence rod 28 is not arranged, and is fixed by welding. , the scaffold plate support rod 26, the side connecting rod 27, the connecting rod 35, and the rotating fence rod 28, which are constructed and fixed over these, constitute a metal lower enclosure frame 36.

A peripheral frame rod 38 is installed across the upper end and intermediate portion of each lifting column 37 that is slidably inserted into each side column 25 and is fixed by welding, and is connected to each of the lifting columns 37 and them. The metal upper enclosure frame 39 is constructed by the surrounding frame rods 38 which are erected and fixed across.
are configured, and a lower enclosure 36 and an upper enclosure 3
9 constitutes the surrounding frame 2.

Scaffolding board 1 constructed by connecting a large number of band-shaped metal plates
The base end portion of each intermediate support 24 is pivotally connected to the intermediate portion of each intermediate support 24 by a support shaft 40 extending in the front-rear direction, and the scaffold board 1 is rotated and placed on one or the other scaffold support rod 26. When the scaffold board 1 is placed on the scaffold board support rod 26, the scaffold board 1 becomes horizontal. Further, a scaffold 3 is constituted by the base 4, the enclosure frame 2 fixed thereto, and the scaffold board 1.

A locking hole 41 is provided in the upper end portion of each side support 25.
is provided, and a locking fitting 42 is pivotally attached to the lower end side of each lifting column 37 by a horizontal shaft 43,
A through hole 44 is provided through the locking metal fitting 42, and a pressing spring 4 is provided in the locking metal fitting 42 to press the locking metal fitting 42 in a direction to project it from the lifting column 37.
5 is engaged, and the locking metal fitting 42 is connected to the lifting column 37.
When pushed in, the lifting column 37 can be moved downward into the side column 25, and when the lifting column 37 is pulled up, the locking metal fitting 42 reaches a position facing the locking hole 41. Since the locking fitting 42 is automatically pressed and rotated in the projecting direction by the pressing spring 45 and protrudes into the locking hole 41, the upper enclosing frame 39
Even if the push-up force is released from the upper enclosure frame 39, the upper enclosure frame 39 can be prevented from lowering due to the engagement between the locking metal fittings 42 and the locking holes 41.

A metal horizontal engagement member 46 having horizontal open engagement grooves 6 is fixed by welding to the front and rear portions of one left-right side (the left side in the case of illustration) of the lower part of the frame 22, and the frame 2
A metal downward engagement member 47 having a downward opening engagement groove 8 is fixed by welding to the front and rear portions of the other side in the left and right direction (the right side in the case of illustration) at the bottom of 2. A non-slip rubber sheet 48 made of chloroprene rubber is fixed to the groove surfaces of the groove 6 and the downwardly opening engaging groove 8 with adhesive, and one sidewardly facing engaging member 46 has a side surface on the opening side of the horizontally opening engaging groove 6. A vertical pin 49 for closing is removably inserted and inserted.

A retaining member 10 made of a metal round bar that opens and closes the opening of one of the downward opening engagement grooves 8 is as follows:
It is arranged to extend in the left-right direction and slides between the bearing member 50 fixed to the downward engaging member 47, the supporting member 51 fixed to the frame 22, and each groove side wall portion 9 of the downward engaging member 47. A flange 52 and a bearing member 50 that are movably and rotatably fitted and fixed to the intermediate portion of the locking member 10 for preventing detachment.
A spring 53 is interposed between the locking member 10 for preventing removal and pressing the locking member 10 in the groove opening direction.
4 is integrally provided, and a weight 55 for regulating the direction of the retaining protrusion 54 is provided on an arm that is bent and connected at right angles to the base end of the retaining member 10.
are screwed and fixed, and each groove side wall portion 9 of the downward engaging member 47 has a protrusion passage recess 56 at a position that does not align with the retaining protrusion 54 when the weight 55 is hanging down. is provided.

As shown in FIG. 8, the locking member 10 for preventing detachment
is inserted into the through hole 57 of each groove side wall 9 in the downward engaging member 47, and the locking protrusion 54 is engaged with the outer surface of the groove side wall 9 and the weight 55 is placed in a hanging state. The weight of the weight 55 prevents the locking member 10 from rotating, and therefore the opening of the downward opening engagement groove 8 is held closed by the locking member 10. Further, when the weight 55 is held and the locking member 10 is rotated so that the locking protrusion 54 is aligned with the projection passage recess 56, the force of the spring 53 is applied to the locking member 10 to prevent the locking member from coming off. 10 is moved in the groove opening direction, the opening of the downward opening engagement groove 8 is opened, and the retaining projection 54 is accommodated in the recess 58 of the bearing member 50.

When performing maintenance such as inspection and repair of a suspension bridge using a portable scaffold configured as described above,
First, as shown in FIGS. 15 and 16, a base 4 is attached to one handrail 5 in the maintenance passage 14.
The horizontal opening engagement groove 6 at one end is fitted from the side, and the downward opening engagement groove 8 at the other side of the base 4 is fitted from above into the other handrail 7 in the maintenance passage 14. Then, the vertical pin 49 is fitted into the horizontal engaging member 46 at the opening side of the horizontal opening engaging groove 6, and the locking member 10 is inserted into each of the downward engaging members 47 at the lower part of the parapet handrail 7. It is inserted across the groove side wall portion 9.

Next, after the worker removes the rotating fence rod 28 from the bracket 31 and lets it hang down, the passage plate 1 of the maintenance passage 14 is
1, step onto the base 4, then rotate the rotating fence rod 28 to the horizontal position and lock it to the bracket 31, and then
The worker transfers from the base 4 to the scaffold board 1,
Road steel deck 1 shown in Figures 15 and 17
9. Perform maintenance work such as inspection and repair of the horizontal beams 20 and vertical beams 21, etc. In this case, the downward engaging member 4 from the parapet handrail 7 is secured by the locking member 10 for preventing detachment.
7 is prevented from leaving.

After completing the maintenance work at one location, the portable scaffolding is sequentially moved in the longitudinal direction of the maintenance passageway 14.
Perform maintenance work such as inspections and repairs. Further, when the portable scaffold passes under the lower part of the upper chord member 17 of the main groove, the upper enclosure frame 39 is lowered.

When performing maintenance work on the left suspension bridge section above the maintenance passage 14, rotate the scaffolding board 1 to the left position shown by the chain line in Fig. 1, and perform maintenance work on the right suspension bridge section above the maintenance passage 14. When performing this, the scaffold board 1 is rotated to the right position shown by the solid line in FIGS. 1 and 16.

When implementing this invention, the vertical pin 49 may be omitted. In addition, as the locking member 10 for preventing disengagement that closes the opening of the downward opening engagement groove 8, a horizontally rotating locking member or any other locking member can be used instead of the sliding locking member used in the above embodiment. members may also be used.

The enclosing frame 2 may be non-extendable, and the scaffolding board 1 may be fixed to the enclosing frame 2 without being rotatably attached.

Moreover, if the horizontal open engagement groove 6 is made into a long groove, even if there is an error in the interval between the handrails 5 and 7 on both sides of the maintenance passage 14, the portable scaffold can be fitted and installed without any problem.

[Effect of idea]

According to this invention, in one side of the base 4 of the scaffold 3 having the scaffold board 1 and the surrounding frame 2, there is a horizontal opening engagement groove 6 that is fitted from the side to one of the handrails 5 in the maintenance passage. is provided, and the base 4
At the bottom of the other side, there is provided a downward opening engagement groove 8 that fits into the other handrail 7 in the maintenance passageway from above, so that the handrails 5 and 7 in the maintenance passageway 14 can be used. Therefore, a portable scaffolding having a scaffold board 1 located at a higher level than the parapet handrail can be easily set up, and the steel deck slab 1 of a bridge such as a suspension bridge can be easily set up.
9 and the members supporting it, such as the cross beams 20 and vertical beams 21, can be easily and reliably maintained, and the groove side wall portion 9 of the downwardly opening engaging groove 8 is provided with Since a locking member 10 for preventing disengagement is provided to open and close the opening, by closing the opening of the downward opening engagement groove 8 with the locking member 10, the downward opening engagement from the parapet handrail 7 is prevented. Effects such as being able to reliably prevent the groove 8 from coming off and ensuring safety can be obtained.

[Brief explanation of drawings]

Figures 1 to 14 show one embodiment of this invention, in which Figure 1 is a front view of a portable scaffold for bridge maintenance, Figure 2 is a vertical front view thereof, and Figure 3 is a front view of a portable scaffold for bridge maintenance. Fig. 4 is an enlarged sectional view taken along line BB of Fig. 1, Fig. 5 is an enlarged sectional view taken along line C-C of Fig. 1, and Fig. 6 is an enlarged sectional view taken along line C-C of Fig. 1. 7 is a bottom view of the portable scaffold, FIG. 8 is a longitudinal sectional front view showing the vicinity of the downward engaging member and the locking member for preventing removal, and FIG. 9 is the E of FIG. 8. - E-line sectional view,
FIG. 10 is a longitudinal sectional front view showing a horizontal engagement member equipped with a vertical pin, FIG. 11 is a partially longitudinal sectional front view showing the installed state of the rotating fence rod, and FIG. 12 is a partially sectional plan view thereof. FIG. 13 is a longitudinal sectional side view showing a state in which the upper column is locked to the lower column, and FIG. 14 is a longitudinal sectional front view thereof. FIG. 15 is a partially vertical side view showing the portable scaffold of this invention fitted and set on a parapet handrail in a maintenance passage of a suspension bridge, and FIG. 16 is an enlarged sectional view taken along the line F--F of FIG. FIG. 17 is a schematic longitudinal sectional front view of a suspension bridge having a maintenance passage. In the figure, 1 is a scaffold board, 2 is an enclosure frame, 3 is a scaffold, 4 is a base, 5 is a parapet handrail, 6 is a horizontal opening engagement groove, 7 is a balustrade handrail, 8 is a downward opening engagement groove, 9
10 is a groove side wall portion, 10 is a locking member for preventing removal, 11 is a passage plate, 14 is a passage for maintenance, 17 is a main groove upper chord member,
18 is a suspension rod, 19 is a road steel deck slab, 20 is a cross beam, 21 is a longitudinal beam, 22 is a frame, 23 is a scaffolding material, 24 is an intermediate column, 25 is a side column, 26 is a scaffold plate support rod, 27 is a side connecting rod, 28 is a rotating fence rod, 31 is a receiving bracket, 32 is a locking shaft, 33 is an operating handle, 35 is a connecting rod, 36 is a lower enclosure frame, 37 is a lifting support, and 38 is a surrounding area. frame rod, 39 is the upper frame;
40 is a support shaft, 41 is a locking hole, 42 is a locking metal fitting, 4
3 is a horizontal shaft, 45 is a pressing spring, 46 is a horizontal engagement member, 47 is a downward engagement member, 49 is a vertical pin, 5
0 is a bearing member, 53 is a spring, 54 is a locking protrusion for preventing removal, 55 is a weight, 56 is a recess for passing the protrusion, 5
7 is a through hole.

Claims (1)

[Scope of utility model registration request] A horizontal opening engagement groove 6 is provided on one side of the base 4 of the scaffold 3 having the scaffold board 1 and the enclosure frame 2, and is fitted from the side to one of the handrails 5 in the maintenance passage. At the bottom of the other side of the stand 4,
A downward opening engagement groove 8 that is fitted from above to the other handrail 7 in the maintenance passage is provided, and an opening of the downward opening engagement groove 8 is provided in the groove side wall portion 9 of the downward opening engagement groove 8. A portable scaffold for bridge maintenance, characterized in that it is provided with a locking member 10 for preventing detachment that opens and closes.