JPH01255423A - Fixing of cable laid in along conduit line & fixing device for this method - Google Patents

Abstract

PURPOSE:To enable offset design of a cable freely in taking advantage of the space of a manhole effectively, by fixing pressurizedly the cable laid along inside the conduit line radially by means of a pressurizing mechanism, etc., in the conduit line. CONSTITUTION:A cable receiver 10 is inserted under a cable 2 and put it fixedly onto the inner wall of a conduit line 1. To a curved recessed surface 10a the cable 2 is anchored. A pressurizing mechanism 11 is then inserted into the conduit line 1 at its upper part and arranged in position. A pressurizing member 19B is placed face to face to the cable receiver member 10 and anchored onto the circumferential surface of the cable 2. A twisting bar 12 is then operated to pivot and by approaching both moving blocks 13 and 14, the pressurizing member 19A is caused to press the inner wall above the conduit line 1 in the radial direction of the conduit line 1 so that the pressurizing member 19B will press the upper surface of the cable 2 to the radial direction of the conduit line 1. In this way, the cable 2 is pressed radially inside the conduit line 1 and can be fixed. No cable section is therefore required to be fixed with cleat, etc., inside the manhole.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method and a device for fixing cables installed in a conduit.

(Technical background of the invention) When a cable is installed, there is a risk that the cable will expand or contract due to changes in load or temperature, causing fatigue of the metal sheath, or may move significantly and come into contact with protrusions, resulting in damage. . Furthermore, when the cable is installed on a slope, etc., the cable may slip down due to expansion and contraction, resulting in what is called a wave-riding phenomenon.

Therefore, normally, the laid cables are fixed at predetermined intervals using restraint devices such as cleats.

By the way, when fixing a cable installed in a conduit with a retaining device such as a cleat, conventionally, the cable is installed with an offset by snake installation inside a manhole, etc.
In this state, the cable portion located inside the manhole is fixed by a plurality of retainers.

(Problem of Background Art) However, when the cable portion is fixed in the manhole with the retainer in this way, the space in the manhole is occupied by the retainer, so it is not possible to freely design the offset of the cable.

Furthermore, since it is impossible to install a restraining device especially in a manhole with a small space, the cable has to be laid in an unfixed state.

(Object of the Invention) An object of the present invention is to provide a method and a device for fixing cables installed in a conduit without using the space of a manhole.

(Summary of the Invention) The present invention is characterized in that a cable installed in a conduit is fixed by being pressed in the radial direction within the conduit.

In addition, in order to press the cable in the radial direction within the conduit, the cable portion within the conduit is received by a cable receiving member, and the cable portion is pushed against the inner wall of the conduit via the cable receiving member by a pressing mechanism. It is characterized by attaching.

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of a fixing device according to the present invention, and FIG. 2 is a side view of the same device.

In these figures, 10 indicates a cable receiving member, and these cable receiving members 10 are placed on the inner wall of the conduit 1 (see broken line) near the conduit opening 1a. These cable receiving members 10 are made of a relatively soft plastic material, and have a curved concave surface 10a on the upper surface. A cable 2 installed in the conduit is locked to these curved concave surfaces 10a.

On the other hand, a pressing mechanism 11 is disposed above the pipe port la side of the pipe line 1. This pressing mechanism 11 has a threaded rod 12 extending along the longitudinal direction of the cable 2, and this threaded rod 12 is provided with thread grooves 12a and 12b in opposite directions on both sides. Moving blocks 13, 14 are screwed into these threaded grooves 12a, 12b, respectively. A reference block 15 is attached to the central non-threaded portion of the threaded rod 12. This reference block 15 is rotatably but immovably attached to the threaded rod 12 via a bearing or the like. Therefore, when the threaded rod 12 is rotated in one direction with its head 12c, both moving blocks 13.14 approach each other on the threaded rod 12, and when rotated in the opposite direction, both moving blocks 13. 14 are spaced apart from each other on the threaded rod 12. A pair of links 16.16 are pivotally supported via pins 17 at the upper and lower parts of both moving blocks 13.14, respectively. Furthermore, a pair of links 16 and 16 are pivotally supported via pins 17 at the upper and lower parts of both ends of the reference block 15, respectively. One moving block 13
The upper end of the link 16 pivotally supported above and above the block 13 side of the reference block 15 is the vertically moving member 18A.
is pivotally supported via a bottle 17. Also, below this moving block 13 and the block 1 of the reference block 15
The lower end of the link 16, which is pivoted downward on the third side, is pivoted to another vertically movable member 18B via a pin 17. The upper end of the link 16, which is pivotally supported on the upper side of the other moving block 14 and above the block 14 side of the reference block 15, is similarly pivoted to the vertically moving member 18A via a pin 17, and Lower and reference block ■5
A link 16 pivotally supported below the block 14 side of
The lower end of is similarly pivoted to another vertically movable member 18B via a pin 17. A pressing member 19A is attached to the upper surface of the vertically movable member 18A located above.
9A is curved along the inner wall of the conduit 1. Another pressing member 19B is attached to the lower surface of the vertically movable member 18B located below, and this pressing member 19B is curved along the circumferential surface of the cable 2.

Next, the manner of use of the fixing device according to the present invention will be explained together with the fixing method of the present invention.

That is, first, the cable receiving member 10, IO is inserted below the cable 2 and placed on the inner wall of the conduit 1, and the curved concave surface 10
a to lock the part of the cable 2 to be fixed.

Next, the pressing mechanism 11 is inserted and arranged above the conduit 1, and the pressing members 19B, 19B are locked onto the circumferential surface of the cable 2. In this case, both pressing members 19B, 19B are opposed to each cable receiving member 10, 10.

Next, by rotating the threaded rod 12, both moving blocks 13
．． 14 close to each other. Both moving blocks 13.14
approaches, the upper vertically movable member 18A is moved upward by the link 16, and the lower vertically movable member 18B is moved downwardly by the link 16. Therefore, the pressing members 19A, 19A are
The upper inner wall is pressed in the radial direction of the pipe line 1, and the other pressing members 19B, 19B press the upper surface of the cable 2 in the radial direction of the pipe line l. Therefore, the cable 2 can be pressed and fixed within the conduit l in its radial direction.

In this way, when the cable 2 is fixed within the conduit 1, there is no need to fix the cable portion within the manhole with a retainer such as a cleat. As a result, the manhole space can be fully utilized, and the cable offset can be designed freely. In addition, since the cable is fixed within the conduit especially in a manhole with a small space where it is impossible to install a restraining device, it is possible to prevent damage to the cable due to thermal expansion and contraction and the wave-riding phenomenon.

In the embodiments described above, various structures are conceivable for the pressing mechanism 11, and any structure that can press the cable 2 in the radial direction within the conduit 1 may be used.

(Effects of the Invention) According to the present invention, since the cable installed in the conduit is fixed by being pressed in the radial direction by a pressing mechanism etc. within the conduit, the space of the manhole can be effectively utilized. In addition, in manholes in small spaces where it is impossible to install anchoring devices, it is possible to prevent cable damage due to thermal expansion and contraction, metal sheath fatigue, and wave riding phenomena.

[Brief explanation of the drawing]

FIG. 1 is a front view of a fixing device used in the method of the present invention, and FIG. 2 is a side view of the same device. 1--11-----Pipe line, 2-----1--Cable, 10-----1--Cable receiving member, 11-----
----1 pressing mechanism, 12---1--- threaded rod, 13, l 4----1 moving block, 15----
----One reference block, 16------link, 18A, 18B---m=vertical movement member, 19A, 19B-111 pressing member. 1------------One conduit 2-------Cable 10--One--Cable receiving member + 1-----
------- 4th group introduction 12 ---------- One grain group 13, 14 ------ One move r lock + 5-1 ---
−−−−−, solitary block + 6−−−−−−−I
Junk + 8A, 18B---Ichijo-8 Hogunzai +9A, 1
9B---→Jiero material Fig. 1 Fig. 2

Claims (1)

[Claims] 1. A method for fixing a cable installed in a conduit, the cable being fixed by pressing the cable in the radial direction within the conduit. fixing method. 2. A cable receiving member disposed within a conduit to receive a cable portion within the conduit, and a pressing mechanism that presses the cable portion against an inner wall of the conduit via the cable receiving member. A fixing device for conduit installation cables.