JPH10259678A - Fall-off preventive device of steel tower for overhead power transmission cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall-off preventive device of a steel tower for overhead power transmission cables, with which it is possible to go up and down the steel tower safely without use of any lifeline fitted with a safety device by equipping the steel tower itself with this fall-off preventive device. SOLUTION: A fall-off preventive device 8 consisting of a number of frames 8a surrounding the person to go up and down and to serve as a back support is installed along a tower lifting facility 7 in the form, for example of a ladder, furnished on a steel tower. Steps 7a of the lifting facility 7 and each frame 8a constitute a ring. Even in case the person going up and down sets off his foot by mistake or separates his hand off, the hand or foot is hitched certainly with any frame 8a, and the device exerts a fall-off preventive function effectively. Thus the person can go up and down safely with no use of a lifeline fitted with a safety device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention device for a steel tower for overhead power transmission lines, and more particularly to a fall prevention device for preventing a person from ascending or descending from an elevating tower facility.

[0002]

2. Description of the Related Art Towers for overhead power transmission lines are usually provided with equipment for elevating and lowering the tower mainly for maintenance of equipment, but in general, equipment for preventing falling is provided to ensure safety during lifting and lowering. . The conventional fall prevention device is based on the premise that a lifeline with a safety device is possessed, and the safety device of the lifeline with the safety device is installed along the elevating tower equipment such as a ladder provided on the outer surface of the steel tower. A guide rail for fall prevention is provided on the outer surface of the tower.

[0003]

When a safety device of a lifeline with a safety device is moved up and down by engaging with a fall prevention guide rail,
Although it is safe to go up and down, it may be necessary to go up and down accidentally when you are not preparing to go up and down. Therefore, it is convenient if you can go up and down safely without a lifeline with a safety device. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a fall prevention device for an overhead power transmission line tower that is provided with a fall prevention device on a tower itself and that can safely ascend and descend without a lifeline with a safety device. The purpose is to provide.

[0004]

According to the invention, there is provided an overhead transmission line steel tower with a fall prevention device for solving the above-mentioned problems, which comprises a plurality of frames which surround a climber who ascends and descends the elevator tower equipment. It is characterized by being fixed at intervals above and below.

A second aspect of the present invention is characterized in that the elevating tower equipment according to the first aspect has a ladder shape, and the steps of the ladder and the frame form a ring shape.

A third aspect of the present invention is characterized in that the elevating tower equipment according to the first aspect is installed so as to penetrate vertically inside the steel tower.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to the embodiments shown in FIGS. FIG. 1 is a front view of a tower 1 for an overhead transmission line provided with a fall prevention device 8 according to one embodiment of the present invention, and FIG. 2 is a side view of the same. The electric wires 2 are supported at the tips of the left and right arm members 1 b of the steel tower 1 via suspension chains 4. This embodiment is provided with a ladder-like elevating tower equipment 7 comprising a number of steps 7a installed in a manner penetrating up and down the inside of the steel tower 1 as clearly shown in FIGS. 3, 4 and 5. This is applied to the steel tower 1. In the case of the embodiment, the fall prevention device 8 of the present invention is
FIG. 3, which is a cross-sectional view, FIG. 4, and FIG. 5, which are BB cross-sectional views
As shown in the figure, step 7a of the elevating tower equipment 7 which is a ladder
Each of the frame members 8 forms a ring shape with this step 7a and surrounds the ascending and descending person and serves as a backrest.
a is fixed at equal intervals. As shown in FIG. 6, the size of the ring formed by the frame 8a and the step 7a should be large enough to allow a person to move up and down.
These elevating tower equipment 7 and fall prevention device 8 are formed of the same constituent material as the steel tower 1. The elevating tower equipment 7 (step 7a) and the fall prevention device 8 (frame 8a) are shown in FIG.
May be provided at a position indicated by a two-dot chain line.

In the above-mentioned steel tower 1, the fall prevention device 8
As the frame 8a that surrounds the elevating person who goes up and down the ladder-like elevating tower equipment 7 and is fixed at intervals up and down, the person accidentally steps off his / her feet or slips his hand. Even in this case, the limb is caught on the frame 8a and has an effect of preventing the limb from falling. Therefore, it is possible to go up and down without a lifeline with a safety device.

Incidentally, the tower design is designed such that a predetermined electrical separation distance e (see FIG. 1) is ensured between the electric wire 2 and the tower 1 side even when the electric wire 2 rolls due to wind or earthquake. However, in this embodiment, the elevating tower equipment 7 and the fall prevention device 8 are installed inside the steel tower 1, and there is no equipment installed outside the steel tower 1. The line width R (the interval between the left and right electric wires 2) can be reduced while the distance e is secured, and the tower can be made more compact.

In the above embodiment, a ladder-like equipment is provided as the elevating tower equipment 7. However, the invention is not limited to this, and as shown in FIG. 7, an elevating tower equipment 9 composed of step bolts 9a may be used. .

Although the embodiment is applied to the tower 1 having the elevating tower equipment 7 inside the tower, the position of the elevating tower equipment is not particularly limited. It is also applicable to steel towers with tower equipment. In this case, the frame 8a is also fixed to the outer surface of the tower.

In the embodiment, the step 7a of the ladder and the frame 8a are formed in a ring shape. However, the steps 7a and the frame 8a may be arranged in a staggered manner.
Also, the step 7a and the frame 8a do not necessarily have to correspond one-to-one. Further, as in the case of the frame body 8a in the case of the step bolt 9a in FIG. 7, the frame body alone may be independently formed in a ring shape.

[0013]

According to the present invention, a crash prevention device is constructed by arranging a large number of vertically spaced frames which surround the elevating person ascending and descending the ascending and descending tower equipment. Even if the foot is stepped off or the hand is slipped, the limb is always caught on the frame, and the fall prevention function is effectively provided. Since the tower itself is equipped with a fall prevention device, it can be moved up and down without a lifeline with a safety device.
It is easy for people to ascend and descend and can always safely ascend and descend.

Further, since the ring-shaped frame (or the frame and the step) covers the human body, it is possible to reduce the electromagnetic field applied to the human body when moving up and down at the time of liveliness.

Further, when the elevating tower equipment is installed inside the tower, the line width (tower) can be secured while maintaining a predetermined electrical separation distance e between the electric wire and the tower side. The distance R between the left and right electric wires) can be further reduced, and the tower can be easily made compact.

[Brief description of the drawings]

FIG. 1 is a front view of a tower for an overhead transmission line provided with a fall prevention device according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

FIG. 4 is a sectional view taken along line BB in FIG. 1;

5 is an enlarged perspective view of a portion of the elevating tower equipment and the fall prevention device in FIG. 1 and the like.

FIG. 6 is a top view of a state in which a person moves up and down the elevating tower equipment.

FIG. 7 is a perspective view of an elevating tower facility and a fall prevention device when the present invention is applied to a step bolt-shaped elevating tower facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel tower (iron tower for overhead transmission lines) 2 Electric wire (overhead transmission lines) 4 Suspension insulators 7, 9 Elevating tower equipment 7a, 9a Step 8 Fall prevention device 8a Frame

Claims (3)

[Claims] 1. A fall prevention device for an overhead power transmission line tower, wherein a plurality of frames, which surround a person elevating and lowering the tower equipment and serve as a backrest, are fixed to the tower at intervals. 2. The elevating tower equipment is of a ladder type,
The fall prevention device for an overhead transmission line tower according to claim 1, wherein the step of the ladder and the frame form a ring shape. 3. The fall prevention device for an overhead transmission line tower according to claim 1, wherein the elevating tower equipment is installed so as to vertically penetrate the inside of the tower.