JP2002275841A - Reinforcing structure of opening part of steel pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure of an opening part of a steel pipe becoming a weak point in strength. SOLUTION: In the invention of the claim item 1, diagonal brace members 4 and 4 such as a turnbuckle are crossingly installed in the opening part 2 formed on a side wall of the steel pipe 1 used as a pole for internally storing electric equipment to prevent deformation of the opening part by a torsional load. In the invention of the claim item 3, a reinforcing plate also serving as a cover is installed in the opening part 2 formed on the side wall of the steel pipe 1, and the periphery is fixed by bolts to the steel pipe itself or a frame body projected from the steel pipe to prevent deformation of the opening part by the torsional load and a bending load. As a result, the opening part is reinforced to prevent a breakage accident of the steel pipe with the opening part as a breakdown starting point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for an opening formed in a steel pipe used as a road lighting pole, a traffic signal pole, an electric road sign pole, and the like.

[0002]

2. Description of the Related Art Boxes, such as a distribution box and a control box, and electric equipment need to be mounted near the base of a steel pipe used as a pole having the above-described electric equipment. These may be welded to the outside of the steel pipe or housed inside the steel pipe. In either case, a relatively large opening is formed in the side wall of the steel pipe.

In the former case, the opening of the steel pipe is covered with boxes, and electric wiring is made through this opening.
In the latter case, the electric equipment is inserted into the steel pipe through the opening of the steel pipe, and the opening is covered with a lid. These boxes and lids are designed to have a sealing property to prevent rainwater from entering the inside of the steel pipe through the opening, and are designed to be easily opened and closed for inspection and the like.

[0004] However, the rigidity of these boxes and the lid itself has hardly been considered so far, and the rigidity of the box or the lid itself is significantly lower than that of the steel pipe main body. For this reason, the opening of the steel pipe tends to be a weak point in strength, and when the bending or torsion load is repeatedly applied to the steel pipe by wind or traffic vibration as shown in FIG. In some cases, it was deformed in the direction and became a fracture starting point. This tendency is particularly remarkable when the opening is rectangular and the radius of curvature of the corner is small. In the worst case, the pole may be broken.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and can reinforce an opening always provided in a pole in which electric equipment is built while ensuring the ease of opening and closing. The purpose of the present invention is to provide a reinforcing structure for a steel pipe opening.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a pair of openings formed in a side wall of a steel pipe used as a pole containing electric equipment. A brace member is attached to a corner position to prevent deformation of the opening. In addition,
It is preferable that the brace members are adjustable in length and detachable.

In order to solve the same problem, a third aspect of the present invention is to provide a steel pipe used as a pole having a built-in electric facility with an opening formed in a side wall of a steel pipe provided with a reinforcing plate covering the entire opening. The reinforcing plate is attached to the steel pipe itself or a frame projecting from the steel pipe by bolts. In the third aspect of the present invention, it is preferable that the reinforcing plate covering the opening is provided with a reinforcing rib.

According to the first aspect of the present invention, since the brace members are mounted at diagonal positions that form a pair of openings, the brace members suppress deformation of the openings when the steel pipe is subjected to a torsional load. According to the invention of claim 3, since the periphery of the reinforcing plate covering the entire opening is fixed to the steel pipe itself or a frame projecting from the steel pipe by bolts, the steel pipe is subjected to a torsional load or a bending load. The reinforcing plate suppresses the deformation of the opening. As a result, the opening of the steel pipe is reinforced, and destruction starting from the opening is prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. 2 and 3 are views showing an embodiment of the invention of claim 1, wherein 1 is a road lighting pole, a traffic signal pole,
A steel pipe 2 used as a pole that incorporates electric equipment such as a lightning-type road sign pole is a substantially square opening formed on a side wall thereof. Holes 3 penetrating the side wall of the steel pipe 1 are formed at each corner of the opening 2, and bracing members 4, 4 are attached at diagonal positions forming a pair. In order to secure the strength, it is necessary that the position of the hole 3 is kept away from each corner of the opening 2.
Further, the periphery of the hole 3 can be reinforced by a suitable means such as a bush.

The type of the brace members 4, 4 is not particularly limited, but it is preferable that the length of the brace members be adjustable and detachable. In this case, a turnbuckle is used. The turnbuckle is composed of a main body 5 having opposite ends threaded at both ends and screw rods 6 and 7 screwed to both sides thereof. The other ends of the screw rods 6 and 7 are bent into the holes 3 described above. Is plugged in. Although the end of the threaded rod 6 is bent in a U-shape as shown in the figure, the ends of the other threaded rods 7 are bent in an L-shape to facilitate attachment and detachment. In order to avoid mutual interference of the turnbuckles, one is attached from the outside of the opening 2 and the other is attached from the inside.

After the electric device 8 is inserted into the inside of the steel pipe 1 through the opening 2 and attached to the inner wall surface thereof, the screw rods 6 and 7 are attached to the diagonally positioned holes 3 and 3, respectively. The main body 5 is rotated until a sufficient tension is obtained. As a result, as shown in FIG. 1, when the torsion load is applied to the steel pipe 1 and the opening 2 is going to be deformed, these brace members 4, 4 act to prevent a change in the diagonal length. Therefore, the deformation of the opening 2 is prevented. As a result, the torsional rigidity is significantly improved and the opening 2 can be reinforced as compared with the conventional steel pipe 1 in which the opening 2 is simply provided.

A frame 9 is welded to the periphery of the opening 2, and lid mounting brackets 10 are provided on both upper and lower ends thereof. Then, as shown in FIG.
Has been fixed by. A packing 13 is arranged between the back surface of the lid 11 and the end surface of the frame 9 to prevent rainwater or the like from entering the inside of the steel pipe 1 from the opening 2.

FIGS. 4 and 5 are views showing an embodiment of the third aspect of the present invention. A frame 9 having a sufficient thickness is welded around the opening 2. In this embodiment, the size of the opening 2 matches the inner size of the frame 9. Reference numeral 14 denotes a reinforcing plate which also serves as a lid covering the entire opening. In this embodiment, the peripheral wall 1 is fitted so as to fit into the inside of the frame 9 exactly.
6 is bent outward. In order to increase the strength of the reinforcing plate 14, it is preferable to provide a reinforcing rib 17 as shown in the figure outside.

The reinforcing plate 14 is fixed by bolts 15 to the frame 9 projecting from the steel pipe 1 around its periphery. In this embodiment, the bent peripheral wall 16 of the reinforcing plate 14 is fitted inside the frame body 9 and is firmly fixed by a large number of bolts 15 penetrating both of them. Since the reinforcing plate 14 acts to suppress the deformation of the opening 2 in all directions, it not only improves the torsional rigidity of the steel pipe 1 as shown in FIG. Can be prevented to contribute to improvement in bending rigidity. The reinforcing plate 14 also has a function as a lid of the opening 2, and it goes without saying that a packing may be interposed in order to enhance waterproofness.

FIGS. 6 and 7 show another embodiment of the third aspect of the present invention. In this embodiment, a reinforcing plate 14 also serving as a lid is directly fixed to the steel pipe 1 around the opening 2 by a large number of bolts 15. It is preferable that the reinforcing plate 14 is provided with a reinforcing rib 17 as shown in the figure. If the entire surface of the opening 2 is covered with the reinforcing plate 14 having sufficient rigidity and the periphery thereof is integrated with the steel pipe 1, the torsion rigidity and bending can be achieved in the same manner as in the embodiment shown in FIGS. The rigidity can be improved and the opening 2 can be reinforced.

The reinforcing plate 14 serving also as a lid used in the third aspect of the present invention is fixed to the steel pipe 1 itself or to the frame 9 protruding from the steel pipe 1 with bolts 15, so that maintenance work is required. Can be easily removed.

[0017]

As described above, according to the reinforcing structure of the steel pipe opening of the present invention, the opening always provided in the pole containing the electric equipment is reinforced by using a brace member or a reinforcing plate. The torsional rigidity and bending rigidity of this portion can be increased. For this reason, even when a torsional load or a bending load is applied to the steel pipe, the opening is not deformed, and it is possible to prevent the steel pipe from being damaged due to the opening as a fracture starting point.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a steel pipe having an opening and torsional stress acting on the opening.

FIG. 2 is a front view of an opening showing the first embodiment of the present invention;

FIG. 3 is a longitudinal sectional view of an opening showing the first embodiment of the present invention;

FIG. 4 is a perspective view of an opening showing an embodiment of the third invention.

5 is a sectional view taken along line AA of FIG. 4 and a perspective view showing torsional stress and bending stress acting on an opening.

FIG. 6 is a perspective view of an opening showing another embodiment of the invention of claim 3;

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Opening 3 hole 4 Brace member 5 Main body of turnbuckle as a brace member 6 Screw rod 7 Screw rod 8 Electrical equipment 9 Frame 10 Lid mounting bracket 11 Lid 12 Bolt 13 Packing 14 Reinforcement plate also serving as lid 15 Bolt 16 Folded peripheral wall 17 Reinforcing rib

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tetsumi Kondo 2-6-3 Otemachi, Chiyoda-ku, Tokyo Nippon Steel Corporation F-term (reference) 2D064 AA11 AA22 BA01 BA19 CA04 DB11 HA13 JA01

Claims (4)

[Claims] A steel pipe characterized in that a brace member is attached to a pair of diagonal positions of an opening formed in a side wall of a steel pipe used as a pole having a built-in electric facility, and the opening is prevented from being deformed. Reinforcement structure of opening. 2. The reinforcing structure for a steel pipe opening according to claim 1, wherein the bracing member is adjustable in length and detachable. 3. A reinforcing plate that covers the entire opening is attached to an opening formed in a side wall of a steel pipe used as a pole having a built-in electric facility, and the periphery of the reinforcing plate is projected from the steel pipe itself or the steel pipe. A steel pipe opening reinforcement structure, which is fixed to a frame body by bolts. 4. The reinforcing structure for a steel pipe opening according to claim 3, wherein the reinforcing plate covering the opening has a reinforcing rib.