JPH07229110A - Scaffolding floor construction for suspension bridge cable erection - Google Patents

Abstract

PURPOSE:To enhance safety by fixing a coarse mesh welded wire gauze to upper parts of plural wire ropes errected between main towers or abutments, and fixing a small article falling preventive net composed of a fine mesh welded wire gauze above the coarse wire gauze. CONSTITUTION:A plurality of wire ropes 3 are erected in parallel to each other between main towers or abutments of a suspension bridge. A plurality of lateral frame materials 4 are fixed at an interval to the ropes 3, handrail posts 9 are fixed to ends of the lateral frame materials 4, and a plurality of handrail ropes 10 are fixed at an interval to the posts 9. A coarse mesh welded wire gauze 6 is fixed at an interval onto the lateral frame materials 4, and a small article falling preventive net composed of a fine mesh welded wire gauze 7 is fixed to the wire gauze 6. Step materials 8 are fixed on the net.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scaffolding floor assembly such as a suspension scaffold (catwalk) used when constructing a suspension bridge cable, and more particularly to a scaffolding floor assembly suitable for an area with a lot of snow.

[0002]

2. Description of the Related Art Cable erection work for a suspension bridge is carried out on a scaffolding floor set of a suspension scaffold called a catwalk erected in the air along the shape of the cable to be erected. An example of a scaffolding floor assembly for a suspension scaffold that has been conventionally used is disclosed in Japanese Patent Publication No. 2216/1990. This scaffolding floor set 1 comprises a plurality of wire ropes 3 laid in parallel between the main towers 2 or abutments of a suspension bridge, a horizontal frame member 4 for fixing the wire ropes 3 and extending in the scaffold width direction, and this horizontal frame member. Handrail props 9 with handrail ropes 10 fixed to both ends of 4
A thick welding wire mesh 6 arranged and fixed on the wire rope 3; and a small article fall prevention net made of synthetic resin or a hexagonal wire mesh arranged and fixed on the thick welding wire mesh 6. The step members 8 are arranged on the upper part of the net at predetermined intervals in the longitudinal direction of the scaffold floor assembly 1.

[0003]

A small object fall prevention net used in a conventional scaffold floor assembly is one in which the mesh material 13 shown in FIG. 7 is made of twisted fibers of synthetic resin such as nylon, or a tortoise shell. Since it is made of wire netting and two pieces are stacked from the viewpoint of strength, the ratio of the netting material 13 to the netting space is large, so it is easy to receive wind resistance, and a large wind load is applied to the scaffolding floor assembly 1. This is disadvantageous in terms of wind resistant design. In addition, when it is snowing, it is easy for the net to reach and accumulate. In particular, the net made of synthetic resin has a large tendency because the surface of the mesh material 13 is rough and uneven. For this reason, if snowfall is expected, unless the net is removed beforehand, an excessive snow load will be applied to the suspended scaffolding, but when removing and reattaching the net, place it on top. Since it is necessary to remove the existing step material 8, there is a problem that the work becomes complicated. In addition, since the scaffolding floor set for suspension bridges is installed in a steep slope, especially in the case of a net made of synthetic resin, it is easy to cause misalignment when an operator walks on the scaffolding floor set, so the net is partially It was dangerous because it could be pulled by, wrinkled, slipped, or tripped over. SUMMARY OF THE INVENTION It is an object of the present invention to solve these conventional problems, to reduce wind resistance, to prevent snow landing and snow accumulation during snowfall, and to provide a scaffold floor assembly that can be safely operated.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to improve a net for preventing small articles from falling out of the members constituting a conventional scaffolding floor assembly. That is, as a net for preventing small articles from falling, a fine welded wire net 7 is used instead of the conventional synthetic resin or turtle metal net, and the wire net 7 is placed and fixed on the thicker welded wire net 6 by overlapping. It has a structure that reduces wind resistance, prevents snow from accumulating, and prevents deformation during walking. Further, the fine welded wire mesh 7 is formed by bending the outer periphery into a panel shape having a size that can be arranged between the step members 8 of the scaffolding floor assembly 1, and is fixed to the thick welded wire mesh 6 with the fixing piece 12. If fixed, it can be easily attached and detached without removing the step material.

The fine welded wire net 7 for preventing small articles used in the present invention is made by stacking stainless steel or galvanized steel wire having a diameter of about 1 to 2 mm and having a function of anticorrosion vertically and horizontally at intervals of the mesh of 10 to 20 mm. It is used that is manufactured by welding the intersections by resistance welding. This fine welded wire mesh 7
As shown in FIG. 4, is the thick welded wire mesh 6 of the scaffolding floor set 1.
(Diameter about 5 mm, mesh size about 50 mm x 75 mm)
One piece is stacked on top of the above and the appropriate place is fixed to form the floor surface.
Since the fine welded wire net 7 used in the present invention has a sufficient strength with one sheet, it is necessary to double-tension, which is used as a countermeasure against deformation or breakage of a conventionally used net. Absent. Therefore, the occupancy ratio of the mesh material to the mesh space is small, and the surface is circular and smooth, so that it is difficult to receive wind resistance, and it is difficult to land snow during snowfall. Also, since the intersections of the meshes are welded, the wire diameter is small but the rigidity is high, and when the worker walks on the fine welded wire mesh 7, the deformation is small, so that the conventional synthetic resin or the hexagonal shell is used. It does not deform like a wire mesh net and does not wrinkle due to misalignment, so you can work safely. Further, as shown in FIG. 6, the fine welded wire mesh 7 is formed in a panel shape having a size that can be arranged between the step materials 8. Therefore, in a region with a lot of snow, it is necessary to remove the net during the snowfall period. However, since only the panel-shaped fine welding wire mesh 7 can be attached / detached in panel units without changing the step material, it is possible to work extremely easily and safely.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 3 show an embodiment of the present invention. FIG. 1 is a cross-sectional view of the scaffolding floor assembly 1 (cross-sectional view taken along the line AA of FIG. 2), and FIG. 2 is a side view of the scaffolding floor assembly of the main tower of the suspension bridge. Shows a part of. Also, FIG.
Shows a part of the scaffolding floor plan. The scaffolding floor set 1 includes a plurality of wire ropes 3, a plurality of horizontal frame members 4 placed at intervals above the wire ropes 3 in the longitudinal direction of the scaffolding floor set 1, and the scaffolding floor set 1. The handrail support columns 9 fixed to the ends of the horizontal frame members 4 on both sides in the width direction, and the handrail support columns 9 arranged so as to extend in the longitudinal direction of the scaffolding floor assembly 1 and at intervals in the vertical direction. A plurality of handrail ropes 10 fixed to the above, a welding wire net 6 laid on each of the horizontal frame members 4, and a welding wire net 7 laid on the welding wire net 6
And the step material 8. The plurality of wire ropes 3 are laid in parallel between the top of the suspension bridge main tower 2 or the upper ends of the abutments, and U-bolts are attached to the horizontal frame member 4 made of a square pipe extending in the scaffold width direction at predetermined intervals in the bridge axis direction. 5
The horizontal frame member 4 is fixed at a distance from each other, and at both ends of the horizontal frame member 4, a handrail support column 9 in which a plurality of handrail ropes 10 are fixed is provided.
Is fixed upright.

On the upper surface of the horizontal frame member 4, a thick welded wire mesh 6 made of a steel wire having a diameter of 5 mm and having a mesh size of 50 × 75 mm is stretched over the entire surface. The welding wire nets 7 are overlapped and fixed to the thick welding wire net 6 at appropriate intervals. FIG. 4 is a three-dimensional view showing the details of the arrangement of these welding wire nets.
On the fine welded wire mesh 7, a step material 8 made of wood square material having a length and width of about 50 mm is fixed by a number wire or the like so that the worker does not slip when walking.

If the thin welded wire mesh 7 is made of a steel wire that is too thin, the strength is insufficient and the wire mesh 7 is easily deformed during walking.
If it is made too thick, not only will the weight be heavier, but the mesh space will be smaller. Furthermore, the size of the mesh should be such that members such as bolts used on the scaffold do not fall, and a steel wire having a diameter of 1 to 2 mm or a steel wire having a corrosion prevention function such as galvanization is 20
It is used that is formed by overlapping meshes at mm intervals and welding the intersections of the vertical steel wires and the horizontal steel wires.

The fine welded wire mesh 7 is produced in the form of a strip, and is made into a roll or a sheet to form a thick welded wire mesh 6
Although it may be arranged so as to overlap the upper surface of the snow, as shown in FIGS. 3 and 6, it is easier to put snow on and take off snow when the panel shape is such that it can be placed between the step members 8. Becomes That is, since the step material 8 can be attached / detached without removing the step material 8 in a panel shape, it is extremely convenient to attach / detach the fine welding wire net 7 before and after the snow-covering period in a snowy area.

The fine welded wire mesh 7 may be fixed to the thick welded wire mesh 6 by bundling at appropriate places with a numbered wire or the like, but by using a ring-shaped fixing piece 12 and using a dedicated tool, it is easier. It becomes possible to work. As shown in FIG. 5, the end of the fine welded wire mesh 7 is approximately 180
By bending the product once, it is possible to prevent the deformation of the end portion and prevent injury during the handling work.

When the fine welded wire netting 7 used in the present invention is used not only for the scaffolding floor surface but also for the side net 11, the wind resistance can be reduced as compared with the case where the conventional synthetic resin net is used. In this case, a panel-shaped material may be used, but since the step material 8 is not used unlike the floor surface, it is manufactured in a belt shape and wound up in a roll shape to be stretched while being stretched. The work efficiency is better if it is fixed to 10. For the installation method of other members of the scaffolding floor set 1,
Known means such as disclosed in Japanese Patent Publication No. 2-5216 may be used, and the description thereof is omitted here.

[0012]

According to the present invention, as a net for preventing small articles from falling from a scaffolding floor set, a fine welded wire mesh is used instead of a conventional synthetic resin or turtle wire mesh net, which is a thick welded wire mesh. Since it is placed and fixed on top of the above, it is difficult to receive wind resistance and snow is hard to land. In addition, since the intersection of the vertical steel wire and the horizontal steel wire forming the mesh is welded and fixed, the strength is high and it is difficult to deform during walking, so that it is possible to work safely. Further, this fine welded wire mesh is formed by bending the outer periphery into a panel shape having a size that can be arranged between the step members 8 of the scaffolding floor assembly, and is fixed to the thick welded wire mesh 6 with the fixing piece 12 or the like. If fixed, it can be easily attached and detached without removing the step material 8.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a scaffolding floor assembly according to an embodiment of the present invention.

FIG. 2 is a partial side view of the suspension scaffolding near the main tower portion of the suspension bridge according to the embodiment of the present invention.

FIG. 3 is a plan view showing a part of the scaffold floor assembly according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a state in which a fine welding wire net for preventing small articles from falling is arranged and fixed on a thick welding wire net of the scaffolding floor set according to the embodiment of the present invention.

FIG. 5 is a vertical cross-sectional front view showing a fine welded wire mesh used in an example of the present invention.

FIG. 6 is a partially cutaway plan view showing a welding wire mesh and a step material used in an embodiment of the present invention.

FIG. 7 is a perspective view showing a synthetic resin net used in a conventional scaffold floor assembly.

[Explanation of symbols]

 1 Scaffold Floor Assembly 2 Main Tower 3 Wire Rope 4 Horizontal Frame Material 5 U Bolt 6 Heavy Welded Wire Mesh 7 Fine Welded Wire Mesh 8 Step Material 9 Handrail Posts 10 Handrail Rope 11 Side Net 12 Fixed Piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Nishimoto 1-4-24-403 Kotsu-cho, Muroran-shi, Hokkaido (72) Inventor Hirohide Kiyomi 2-13-33 Etomo-cho, Muroran-shi, Hokkaido (72) Koji Sato 2-11-6 Shimizu-cho, Muroran-shi, Hokkaido (72) Inventor Kazuya Tanaka 4-31-1, Washibetsu-cho, Noboribetsu-shi, Hokkaido (72) Inventor Takuo Sugita 2-3-6 Otemachi, Chiyoda-ku, Tokyo Made in Japan (72) Inventor Yoshifumi Sakamoto Yoshichiro Sakamoto 2-3-6 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Co., Ltd. (72) Masao Hirosawa 3-10-30 Minamiyama-cho, Higashinada-ku, Kobe (72) ) Inventor Hiroshi Matsui 4-4-10 Honcho, Chuo-ku, Osaka Minobu Honcho, Sumisho Building

Claims (2)

[Claims] 1. A plurality of wire ropes 3 laid in parallel between main towers or abutments of a suspension bridge, a horizontal frame member 4 fixed to the wire ropes 3, and fixed to both ends of the horizontal frame member 4. A handrail support column 9 with a handrail rope, a thick welded wire net 6 arranged and fixed on the upper part of the wire rope 3, and a small article drop prevention net arranged and fixed on the upper part of the thick welded wire mesh 6. In the scaffolding floor set 1 composed of step members 8 arranged at predetermined intervals in the longitudinal direction on the upper part of the net,
A scaffolding floor assembly for erection of a suspension bridge cable, characterized in that a net for preventing small articles is made of a fine welded wire mesh 7. 2. A fine welded wire mesh 7 for preventing small articles from falling,
The scaffolding floor for suspending bridge cable erection according to claim 1, which is formed into a panel shape having a size capable of being arranged between the step members 8 by bending the outer periphery and is arranged and fixed on the thick welded wire mesh 6 in an easily detachable manner. set.