JP2022097091A - Manufacturing method of scaffold under elevated structure and delivering tool - Google Patents

Abstract

To provide manufacturing method for installing a scaffold under an elevated structure with an excellent workability.SOLUTION: A manufacturing method of a scaffold under an elevated structure comprises steps (1)-(3). (1) A delivering tool is fixed on an installed scaffold under an elevated structure, (2) a transverse beam 75 and an extension scaffold material 15 are delivered in an extension direction of the scaffold while supporting them by the delivering tool and (3) a support material 771 is fixed to an elevated structure main member 51 and coupling the delivered transverse beam 75 and the elevated structure main member 51 by the support material.SELECTED DRAWING: Figure 7

Description

The present invention relates to bridges and scaffolds mounted under elevated tracks such as railroads and highways.

Temporary temporary scaffolding may be installed under the overpass for the work of inspecting and repairing elevated bridges, railroads, highways, etc. (hereinafter collectively referred to as "elevated"). In addition, the underpass scaffolding can cover the overpass that has deteriorated over time, and even if a piece of concrete should fall from the overpass, it can be prevented from hitting cars or pedestrians passing underneath, and inspection and repair can be done at any time. Demand for installing it as a permanent scaffolding is also increasing.

Whether it is a temporary scaffold or a permanent scaffold, the underpass scaffolding is installed so as to cover the underpass with a space under which a car or the like can pass so as not to obstruct the traffic. Until now, aerial work platforms were sometimes used, but there were inconveniences such as the need to temporarily block traffic. Furthermore, in places where aerial work platforms cannot enter, scaffolding was set up from a pontoon floating on the surface of the earth or water, and scaffolding under the overpass was installed, resulting in poor workability.
An object of the present invention is to provide a manufacturing method for installing an elevated scaffold with good workability and a delivery tool used in the manufacturing method.

One aspect of the present invention is a method for manufacturing an elevated scaffold including the following steps (1) to (3).
(1) Step of fixing the delivery tool on the installed scaffold under the overpass (2) Next, the step of feeding the cross beam and the extension scaffold material in the direction to extend the scaffold while supporting it with the delivery tool (3). Next, the problem was solved by fixing the support material to the elevated main member and connecting the sent-out cross beam and the elevated main member with the support material.

Further, another aspect of the present invention is a delivery tool used for manufacturing an elevated scaffold, which includes a fixing tool and a main body tool, and the fixing tool is fixed on an installed scaffolding, and the main body tool is The problem was solved by using a delivery tool that is held by the fixture, holds the cross beam and the extension scaffolding material, and is sent out from the installed scaffolding in the direction in which the scaffolding is to be extended. ..

According to the present invention, the scaffolding under the overpass can be easily installed and the workability can be improved.

Schematic diagram of Example 1 (A) Cross-sectional view of the overpass (B) Side view of the overpass Cross-sectional view of the back panel installed between the cross beams and the floor material in the front-rear direction (direction in which the scaffold is to be extended) Horizontal cross-sectional view of the box-shaped back panel Explanatory drawing of delivery tool of Example 1 Enlarged view in the frame of FIG. Explanatory drawing of process 1 to process 2 of Example 1 Explanatory drawing of steps 3 to 4 of Example 1 Explanatory drawing of steps 5 to 10 of Example 1 Cross-sectional view along the extended cross beam Explanatory drawing connecting the cross beam and the plate girder

(Example 1)
FIG. 1 is a schematic diagram of the first embodiment. 1 (A) is a cross-sectional view of the elevated structure, and FIG. 1 (B) is a side view of the elevated structure. The scaffolding 7 provided under the overpass 5 is shown. Under the road surface material 52, an elevated main member such as a plate girder 51 or a box girder that supports the road surface material 52 is provided. The first scaffold 7 is installed by assembling the ground scaffold 4 from the ground as in the conventional technique. The cross beam 75 is supported by being connected to an elevated main member such as a plate girder 51 via a support member 77, and is supported by a floor material 74 or a back surface between the cross beam 751 of the installed scaffold and the cross beam 75 extending beyond it. A new scaffold 7 is created by attaching the panel 73. A louver 76 may be installed to take in outside light and prevent rain and wind from blowing in.

[Scaffold structure]
The direction centered on the direction in which the scaffold 7 is to be extended from the installed scaffold 71 is hereinafter referred to as the "front-back direction", the extension side is referred to as "front", and the "installed scaffold 71" side is referred to as "rear". That is. Further, the direction horizontally orthogonal to the direction in which the scaffold 7 is to be extended, that is, the width direction of the viaduct is hereinafter referred to as "horizontal direction".
FIG. 2 is a cross-sectional view of the back surface panel 73 and the floor material 74 installed between the cross beams 75 in the front-rear direction, and FIG. 3 is a cross-sectional view of the back surface panel 73 in the lateral direction. The back panel 73 is a member that supports the floor material 74 and hides the scaffolding 7 with an outer bottom surface 734 to give a neat appearance in terms of design.
As shown in FIG. 2, the cross beam 751 of the installed scaffold and the extended cross beam 75 are exactly the same H-shaped steel, and are supported by the plate girder 51 (elevated main member) via the support member 77 as described above. ing. Next, the back panel 73 is fixed between the pair of cross beams 75 by fastening the back panel holding member 731 to the web of the H-shaped steel which is the cross beam 75.
As shown in FIG. 3, the structure of the back panel 73 is a long body having a box-shaped cross-sectional shape. The back panel 73 has a fitting portion 735, and adjacent back panels 73 are connected one after another. Further, the back surface panel 73 is fitted in parallel between the pair of cross beams 75, and is fastened to the back surface panel holding material 731 using the holding material fastener 733.

[Variations of scaffolding structure]
If necessary, the floor material 74 is provided on the back panel 73. In the scaffold 7 to be removed in a short period of time such as a temporary scaffold, the floor material 74 may not be used in order to improve the removal workability. Therefore, a non-slip 736 is provided on the front surface so that the back panel 73 can be used as a floor.
Further, by using the long L-shaped back panel holding material 731, a plurality of back panels 73 can be fastened, and workability can be improved. Further, a long L-shaped back panel holding member 731 may be previously fastened to a plurality of back panels 73 to form a back panel unit (not shown). The back panel unit can be created in a factory or the like, and the work on site can be reduced. Further, the workability is further improved by installing the back panel unit so as to be fitted between a pair of cross beams 75. ..

[Fixture of Example 1]
FIG. 4 is an explanatory diagram of the delivery tool 1 of the first embodiment. The delivery tool 1 of the first embodiment has a total of 4 fixing the main body tool 12 composed of a pair of left and right delivery members 14 and a tip jig 143 attached to the tip thereof and each delivery member 14 at two front and rear positions. It is composed of two fixtures 11.
The fixture 11 is fixed to the upper surface of the cross beam 751 of the installed scaffold, and holds the delivery member 14 in a state where one side surface of the delivery member 14 (H-shaped steel) is exposed.
An extension scaffolding material holding groove 142 is formed between the flanges of the delivery member 14 (H-shaped steel) which is one exposed side surface, and is extended between the extension scaffolding material holding grooves 142 of the pair of delivery members 14. The scaffolding material 15 is strongly sandwiched.

[Main body tool of Example 1]
FIG. 5 is an enlarged view within the frame of FIG. A tip jig 143 is attached to the tip of each delivery member 14. In FIG. 5, a part of the cross beam 75 is cut out for explanation, and the cross beam mounting portion 144 provided with the cross beam mounting surface 1441 is provided on the tip jig 143, and the cross beam 75 is mounted. ..
When the worker on the installed scaffold 71 pushes out the pair of sending members 14 in the forward direction, both the cross beam 75 and the extension scaffold material 15 are sent forward.
Although not shown, a large number of sets of delivery tools 1 are arranged side by side on the installed scaffold 71, and one cross beam 75 is supported by a cross beam mounting portion 144 of a plurality of sets of delivery tools 1. .. In the first embodiment, the height of the cross beam mounting surface 1441 is set so that when the cross beam 75 is sent out horizontally, the cross beam 75 mounted on the cross beam 75 is at the height as designed.

[Variations of body tools]
Although not shown, a spacer or an adjusting tool for horizontally finely adjusting the cross beam 75 mounted on the cross beam mounting surface 1441 of each delivery tool 1 may be used, if necessary.
Further, a cross beam lock member 1442 may be provided as needed so that the cross beam 75 does not fall from the cross beam mounting portion 144, and although not shown, a fall prevention wire is attached to the cross beam 75 to improve safety. May be good.

[Extended scaffolding material]
In the case of the first embodiment, the extension scaffolding material 15 is held by being sandwiched between the pair of delivery members 14. Therefore, it is not necessary for the end portion of the extension scaffolding material 15 to remain on the installed scaffolding 71 on the installed scaffolding 71, and for example, the back panel 73, the flooring material 74, or the like having substantially the same length as the distance between the pair of cross beams 75. Can also be used as the extension scaffolding material 15. By using the back panel 73 and the floor material 74 together with the extension scaffolding material 15, it is not necessary to separately prepare the extension scaffolding material 15, and there is an effect of reducing the cost. In addition, the space on the installed scaffold 71 is narrow, and the work on the installed scaffold 71, which is as narrow as the short extension scaffold material 15, becomes easier and the workability can be improved. Is advantageous.
It should be noted that it does not prevent the use of a long extension scaffolding material 15 that remains largely on the installed scaffolding 71 even after being sent out.

6 to 8 are process explanatory views of the manufacturing method of the present invention.
[Explanation of each process]
A process 1
The pre-process performed before the method for manufacturing the elevated scaffold of the present invention will be described. As shown in FIG. 1 (B), the ground scaffold 4 is assembled and the scaffold 7 is installed. This scaffold 7 is the installed scaffold 71 illustrated in FIG. 6 (A).

B process 2
4 is an explanatory diagram of the delivery tool of the first embodiment, and FIGS. 6 (B) and 6 (C) are explanatory views of the process 2 of the first embodiment. The step 2 is the "(1) step of fixing the delivery tool 1 on the installed scaffold 71 under the overpass" of the manufacturing method invention of the present invention. A total of four fixtures 11 to be fitted so as to sandwich the extension scaffolding material 15 at the tip of the delivery member 14 made of a pair of H-shaped steels are fixed to the cross beam 751 of the installed scaffolding.
A plurality of such delivery tools 1 are provided side by side in the lateral direction of the installed scaffold 71. The number of delivery tools 1 varies at least depending on where the elevated main member and the cross beam 75 are to be connected. The delivery tool 1 may be installed in a larger number than the number to be connected so that many workers can work on the extension scaffolding material 15.
The pair of cross beams 75 is used as the fixed portion of the fixture 11 because it is a strong member among the installed scaffolding 71, but it is not limited to this, and any member on the installed scaffolding 71 can be used. It may be a member. For example, it may be the support member 77 of the installed scaffold 71 or the leg portion 53 of the elevated track 5.

Further, if the elevated 5 has a downward slope or an upward slope in the direction in which it is going to be extended, and it is necessary to incline the installed scaffold 71 to send out the cross beam 75 and the extension scaffold material 15, the fixture 11 is used. A spacer (not shown) for inclining may be interposed between the installed scaffolds 71 to incline the entire delivery tool 1.

C process 3
7 (D) and 7 (E) are explanatory views of step 3. Step 3 is the process of "(2) supporting the cross beam 75 and the extension scaffolding material 15 with the delivery tool 1 and feeding the scaffolding 7 in the direction (forward direction)" of the manufacturing method invention of the present invention. Equivalent to.
The cross beam 75 is mounted on the cross beam mounting portion 144 provided on the delivery member 14. Then, the delivery member 14 is slid from the fixture 11 and sent out in the forward direction. The cross beam 75 and the extension scaffolding material 15 are sent out the delivery member 14 until the cross beam 75 reaches a predetermined position. The predetermined position is preferably the same interval W as the interval W of the cross beams 751 of the pair of installed scaffolds. The lengths of the floor material 74 and the back panel 73 are standardized, and it is not necessary to prepare different lengths.
Although not shown, in order to ensure safety, a fall protection device such as a wire having a length that is taut when the cross beam 75 to be extended reaches a predetermined position is attached to the elevated main member on the installed scaffold 71. , May be connected to the extending cross beam 75.

D process 4
FIG. 7F is an explanatory diagram of step 4. Step 4 is "(3) Next, the support material is fixed to the elevated main member, and the cross beam sent out and the elevated main member are connected by the support material" of the manufacturing method invention of the present invention.
The operator holds the support chain 771 (support material), moves on the extension scaffolding material 15, and connects the cross beam 75 and the plate girder 51, which is the elevated main member, with the support chain 771 (support material).
FIG. 9 is a cross-sectional view in the horizontal direction. The cross beam 75 is provided with a member for attaching a support chain 771 (support material) such as a mounting ring 753 in advance. The operator attaches the support chain fixing portion 5132 to the plate girder 51 (elevated main member), and connects one end of the support chain 771 (support material) to the plate girder 51 (elevated main member). The other end of the support chain 771 (support material) is connected to a mounting ring 753 provided on the cross beam 75 using a cross beam mounting tool 7712 such as a shackle. As a result, the plate girder 51 (elevated main member) and the cross beam 75 are supported by the support chain 771 (support material).
Although the support chain 771 (support material) is used in the first embodiment, any material may be used as long as it can be the support material 77, and it goes without saying that the chain is not limited to a wire or the like.

Further, when the elevated 5 is inclined downward or upward in the direction to be extended, it may be necessary to lift or lower the elevated beam 5 from the cross beam mounting portion 144 to the position where the cross beam 75 is to be installed. As shown in FIG. 7 (F), the tilt adjusting device 79 (for example, the mounting ring 753 of the cross beam 75) is attached while ensuring safety by supporting the cross beam 75 with the support chain 771 (support material). The work of lifting or lowering the cross beam 75 from the cross beam mounting portion 144 may be performed by the wire 792, the pulley 793 attached to the elevated main member, and the winch 791) installed on the installed scaffold 71). On the extension scaffolding material 15, the worker does not have to lift and lower the heavy cross beam 75, and workability is improved.
The support chain 771 (support material) is provided for the purpose of ensuring safety when attaching the cross beam 75, for the purpose of facilitating the work of the next step 5, and the like. However, in the case of temporary scaffolding that is to be removed in a short period of time, the support chain 771 that can be easily removed is used as the support material 77, and the next step 5 (the step of attaching the suspension material 772 instead of the support chain 771) is continued. ) Can be skipped and the process can proceed to step 6.
In addition, even in a permanent scaffold, if sufficient strength to withstand wind and rain can be secured with the support chain 771 (support material) as it is, or if another means for withstanding wind and rain is taken, step 5 is performed. You can skip to step 6.

E process 5
FIG. 8 (G) is an explanatory diagram of step 5. Step 5 is also the "(3) step of fixing the support material to the elevated main member and connecting the sent-out cross beam and the elevated main member with the support material" of the manufacturing method invention of the present invention.
The process proceeds to step 5 of connecting the cross beam 75 and the plate girder 51 (elevated main member) with a high-strength suspension material 772 (support material) such as a metal profile. See FIG. A suspension material fixing member 752 (L-shaped metal fitting) for attaching the suspension material 772 (support material) is fixed to the cross beam 75, and one end of the suspension material 772 (support material) is fixed. Further, the operator fixes the mounting jig to be the suspension material fixing portion 5131 to the plate girder 51 (elevated main member) and connects it to the other end of the suspension material 772 (support material). By this step, the plate girder 51 (elevated main member) and the cross beam 75 are firmly connected by the suspension material 772 (support material).
As shown in FIG. 10, if there is no suitable elevated main member having high strength at the position where the suspension material 772 (support material) is to be attached, the strength is strong such as the plate girder 51 (elevated main member). Auxiliary material 774 can be attached to the elevated main member, and the suspension material 772 (support material) can be connected via the auxiliary material 774. As a result, the cross beam 75 can be connected to the plate girder 51 (elevated main member) at any desired position. After attaching the suspension material 772 (support material) to the cross beam 75, the support chain 771 attached for safety is removed.

The suspension material 772 (support material) is a support material 77 having higher strength than the flexible support chain 771 (support material), and is suitable for a permanent scaffold. However, when there is a high possibility that strong winds will blow, such as legs that straddle rivers and valleys, a suspension material 772 (support material) may be required even for temporary scaffolding.
Further, in the first embodiment, as described above, the cross beam mounting portion 144 is adopted so that the cross beam 75 is at the height and position as designed when the cross beam 75 is sent out horizontally. Therefore, the suspension material 772 (support material) can be attached to the cross beam 75 mounted on the cross beam mounting surface 1441 without using the support chain 771 (support material) by omitting the step 4. This saves the trouble of attaching the support chain 771 (support material) and improves workability.
When the overpass 5 is inclined up or down in the front-rear direction, as shown in the explanatory diagram of step 4 of FIG. 7 (F), the cross beam 75 is sent out so as to have the height as designed. An inclination adjusting device 79 capable of changing the height of the 75 may be provided.

F process 6
FIG. 8H is an explanatory diagram of step 8. The back panel 73 is attached between the pair of cross beams 75, and the floor material 74 is installed on the back panel 73. The back panel 73 may be used as it is as a floor without installing the floor material 74, and when the scaffold 7 is removed in a short period of time like a temporary scaffold, it is not necessary to remove the floor material 74 and the work is improved. I can plan.

G process 7
When the attachment of the back panel 73 is completed, the delivery tool 1 is removed together with the extension scaffolding material 15.

H process 8
As shown in FIG. 2, the floor material 74 is placed and fixed on the back panel 73 as needed. As described above, the back panel 73 itself can be used as the floor material 74.

I process 9
As shown in the enlarged view of the frame b in FIG. 10, the louver 76 is attached as needed. In the first embodiment, the louver 76 is also configured to be supported by the suspension material 772 (support material) attached to the plate girder 51 via the auxiliary material 774. The louver 76 is provided with a large number of plate materials attached at intervals, and is provided for daylighting and for preventing rain and wind, and improves the environment of the scaffold 7. When a temporary scaffold is installed on a bridge where strong winds blow, a louver 76 may be attached even if the temporary scaffold is used.

J process 10
Using the newly installed scaffold 7 installed in the above process as the installed scaffold 71, steps 2 to 9 are repeated, and the scaffold 7 is extended one after another.

Those including "step 2 to step 5", "step 2, step 3, step 5" or "step 2 to step 4" are included in the manufacturing method of the present invention.
Conventionally, in order to install the cross beam 75 to be extended to a position away from the installed scaffolding 71, there was no choice but to use the ground scaffolding 4 and the aerial work platform. There was also a need to shut it off. The manufacturing method of the present invention and the delivery tool 1 used in the manufacturing method have made it possible to extend the scaffolding 7 without the need for a ground scaffolding 4 or an aerial work platform.

Although the examples according to the present invention have been described in detail with reference to the drawings and various modifiable embodiments have been described above, the specific configuration is not limited to these embodiments, and the present invention is not limited to these embodiments. Even if there is a design change or the like within a range that does not deviate from the gist of the invention, it is included in the present invention.

Further, the above-mentioned examples and various aspects can be combined by diverting the techniques of each other as long as there is no particular contradiction or problem in the purpose and configuration thereof.

1 Sending tool 11 Fixing tool 14 Sending member 142 Extension scaffolding material holding groove 143 Tip jig 1441 Cross beam mounting surface 1442 Cross beam lock member 15 Extension scaffolding material 16 Cross beam / extension scaffolding material Sending tool 12 Main body tool 4 Ground scaffolding 5 Elevated 51 Plate girder (Elevated main member)
5131 Suspension material fixing part 5132 Support chain fixing part 514 Plate girder lower flange 52 Road surface material 53 Leg part 7 Scaffolding 71 Installed scaffolding 73 Back panel 731 Back side panel holding material 733 Holding material Fastener 735 Fitting part 74 Floor material 75 Cross beam 751 Installation Cross beam 752 of finished scaffolding Suspension material fixing member (L-shaped metal fittings)
753 Mounting ring 76 Louver 77 Support material 771 Support chain (support material)
7712 Cross beam fixture 772 Suspension material (support material)
774 Auxiliary Material 79 Tilt Adjuster 791 Winch 792 Wire 793 Pulley

Claims (2)

A method for manufacturing an elevated scaffolding including the following steps (1) to (3).
(1) Step of fixing the delivery tool on the installed scaffold under the overpass (2) Next, the step of feeding the cross beam and the extension scaffold material in the direction to extend the scaffold while supporting it with the delivery tool (3). Next, a step of fixing the support material to the elevated main member and connecting the sent out cross beam and the elevated main member with the support material.
It is a delivery tool used for manufacturing underpass scaffolding.
Equipped with a fixture and a main body,
Fixtures are for fixing on installed scaffolding,
The main body tool is held by the fixing tool, holds the cross beam and the extension scaffolding material, and is sent out from the installed scaffolding in the direction in which the scaffolding is to be extended.

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