JPH04285420A - Top end suspending structure of vertically laid stranded cable - Google Patents

Abstract

PURPOSE:To provide the top suspending structure of a vertically laid stranded cable which can enlarge the holding strength of a plurality of single-core cables being stranded and is cheap and excellent in work execution property. CONSTITUTION:Several tops of the signal-core cables of a vertically laid stranded cable (triplex type cable 11) being constituted by stranding a plurality of single-core cables 10, 10, and 10 are capped with wire grips 13, 13, and 13, individually, and several wire grips are converged and are fixed en bloc to a metal fitting 15. 14 is a compressed clamp which fixes each wire grip and the hanging metal fitting en bloc.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper end suspension structure for a vertically laid stranded cable, such as a triplex cable, in which a plurality of single-core cables are twisted together.

[0002] "Vertical installation" may include installation not only in the vertical direction but also in the longitudinal direction with an inclination.

[0003] "Plurality" means at least two or more.

0004

[Prior Art] For cables installed vertically, a cable grip formed by weaving wire rope into a cylindrical shape is wrapped around the upper end of the cable, and the grip is hung from a hook hanging from the ceiling. It was served to The cable grip exerts a tightening force on the cable due to the load of the lifted cable, thereby obtaining a predetermined gripping force.

[0005] Such a cable grip is also used in a twisted type cable made by twisting a plurality of single-core cables.

FIG. 2 shows a state in which the upper end of a conventional vertically laid cable is suspended, and three single-core cables 1
, 1, and 1 twisted together, the upper end of the triplex cable 2 is cut in steps, and after being insulated by applying an insulating cap 3 and moisture-proof sealing, it is connected with a binding wire (wire) 4. Bundle three cables together, wrap them with vinyl tape, etc. as appropriate, and wrap the cable grip 5 around the upper end of the bundled cables.
The upper eye part is hooked onto a hook 7 fixed to a ceiling beam 6. In addition, 8 is a branch connection part, and 9 is a branch cable.

[0007]

[Problems to be Solved by the Invention] Since the cable grip 5 collectively grips three twisted single-core cables, the cable grip 5 can hold each of the single-core cables 1
, 1, and 1 was not sufficient, and therefore the gripping force on the cable was about 200 to 500 kg.

[0008] The cable grip that provides the above-mentioned gripping force does not provide sufficient gripping force, and when the vertical length of the cable becomes large, the conductor of each cable is directly gripped by the clamp, and each clamp is insulated. They were fixed all at once using a material support.

[0009] The above-described method requires a lot of labor for installation and is expensive. Further, in normal vertical installation in a building, intermediate gripping is performed using cleats or the like even in the middle of the vertical installation part, but such a cable grip requires a large number of intermediate grips.

[0010] Furthermore, such a cable grip is attached to the end of the cable in advance and used as a mooring means when pulling up the cable, but as mentioned above, the gripping force is small, so the cable grip at the end In addition, auxiliary mooring means were required, such as the use of cable grips for intermediate suspension, and work efficiency was poor.

The present invention solves the above-mentioned problems of the prior art, and provides a vertically laid twisted type cable that can increase the gripping force on a plurality of twisted single-core cables, is inexpensive, and has excellent workability. The purpose is to provide an upper end suspension structure.

0012

[Means for Solving the Problems] The hanging structure of the present invention provided in order to achieve the above object is for each single-core cable of a vertically laid stranded cable formed by twisting a plurality of single-core cables. The wire grips are individually wrapped around the upper end of each wire grip, and the wire grips are bundled together and fixed to a hanging metal fitting.

[0013]

[Operation] Since the cable grip wraps around each of the twisted single-core cables, the contact area of the cable grip on each cable becomes the entire circumference of the upper end of the cable, and the gripping force of the cable grip on each cable is You can get something big.

[0014]

[Embodiment] Fig. 1 shows a preferred embodiment of the upper end suspension structure of vertically laid twisted cables according to the present invention. The target is a triplex type cable 11.

The upper end of each cable 10, 10, 10 is insulated by being covered with an insulating cap 12, and a wire grip 13, 13, 13 is wrapped around each upper end.

[0016] Each wire grip 13, 13, 13 is
The cables are bundled at the upwardly extending side of the upper end of the cable, and compressed and fixed all at once by a compression clamp 14. Compression clamp 1
4, an eye-shaped hanging fitting 15 is similarly compressed and fixed. Therefore, each wire grip 13, 13, 13 is
They are collectively fixed to one hanging fitting 15.

Such wire grips 13, 13, 13
According to the company, it can withstand twice the load (1000 kg) compared to the conventional three-wire wire grip.

[0018] Therefore, the wire grips 13, 13, 1
3 is wrapped around the single-core cables 10, 10, 10, fixed all at once to the hanging fitting 15 with the compression clamp 14, and used as a mooring means when pulling up, even if the cable length becomes large, the intermediate hanging means can be used. Predetermined lifting work can be performed without the need for it.

After lifting, the hanging fitting 15 is hooked onto a hook fixed to a ceiling beam to perform a predetermined hanging. In this case, a large cable gripping force sufficient to withstand the load of the cable can be obtained, so the number of cleats in the intermediate portion can be reduced.

[0020]

[Effects of the Invention] As described above, according to the structure for suspending the upper end of vertically laid twisted cables of the present invention, wire grips are individually wrapped around each of the plurality of single-core cables that are twisted together. The gripping force of the cable grip on the cable can be sufficiently increased, and the gripping force on some single-core cables will not be reduced and the cables will not be damaged, and the cable can withstand a large load (1000 kg).

[0021] In addition, unlike the case where multiple conductors are individually clamped, there is no need for a length adjustment mechanism that is necessary when the lengths of the cables are uneven, and it is possible to correct the unevenness of the lengths of the cables. This can be absorbed by the covering length of each cable grip or by its own expansion and contraction, thereby avoiding complication of the structure.

[0022] To provide an upper end suspension structure for vertically laid twisted cables, which has the following effects, can increase the gripping force for a plurality of twisted single-core cables, is inexpensive, and has excellent workability. The intended purpose is fully achieved.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the structure for suspending the upper end of a vertically laid stranded cable according to the present invention, (a) is a side view, (b) is an explanatory side view;
is an explanatory diagram of the bottom.

FIG. 2 shows an example of a structure for suspending the upper end of a conventional vertically laid stranded cable, in which (a) is an explanatory side view and (b) is an explanatory bottom view.

[Explanation of symbols]

10 Single core cable 11 Triplex type cable 12 Insulation cap 13 Wire grip 14 Compression clamp 15 Hanging bracket

Claims (1)

[Claims] Claim 1: A vertically laid stranded cable formed by twisting a plurality of single-core cables, in which a wire grip is individually wrapped around the upper end of each single-core cable, and each wire grip is bundled and suspended. A structure for suspending the upper end of vertically laid twisted cables, which is characterized by being fixed all at once to the metal fittings.