JPH0491607A - Laying method of branched cable - Google Patents

Abstract

PURPOSE:To suppress resistance against twisting or bending and to lay a wire easily and smoothly by previously winding a set of branch cable and a plurality of single core cables connected therewith around a drum, carrying the drum to a site and laying the plurality of cables simultaneously. CONSTITUTION:When a cable is laid, a set of three single core cables 13 are gripped with a cable grip 15 and three cables are laid simultaneously. At that time, the three single core cables 13 are applied with a wire net 16 coupled through a ring rope 17 and an untwisting unit 18 with a laying wire 19. In case of long length, the cables are laid simultaneously. At that time, a cable grip 15 is fixed to the end of each single core cable 13 and coupled through the ring rope 17 and an untwisting unit 18' with a three cable integrating board 20 which is coupled through the untwisting unit 18 with the laying wire 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method of extending a branched cable, such as a shaft cable, used for indoor wiring in a building.

(Prior Art) Usually, single-core twisted cables are used for indoor wiring cables in buildings, especially shaft cables installed in shaft wiring.

Therefore, in the case of shaft cables, branch cables to be routed to each floor must be connected for each floor height.

FIG. 5 is a front view of a branch connection in a conventional single-core twisted cable. In this figure, a trunk line 1 is made up of a plurality of single-core cables 2 twisted together, each cable has a conductor exposed at its branch connection, and the conductor of a branch cable 3 is compressed and connected to these conductors by a C-shaped sleeve. has been done. Only one of them is shown as 4 in the figure.

Note that the branch connection portion is covered with a mold 5 made of vinyl or the like after the connection between the conductors.

The above-mentioned conventional branch cable has the following problems.

■Before branch connection, it is necessary to untwist the trunk cable.

■Since the branch connections are shifted in the direction of the trunk axis to avoid overlapping, molding must be done in multiple steps.

■After molding is completed, it is necessary to return each single-core cable 2 to its original twisted state.

■To ensure smooth wiring, branch cables must be aligned in the same direction.

The above operations (1) and (2) are quite troublesome, and especially when the single-core cable forming the main line is large in size, the operations are difficult and require a long time.

In addition, the work (2) above is also performed in multiple steps, so it takes a long time.

Furthermore, as a result of (2), the overall outer diameter of the one-branch connection increases, and it is necessary to enlarge the cable through-holes in the floors of each floor.

In order to solve the above-mentioned problems, the present applicant has disclosed a flat cable with branches. This branched flat cable has the configuration described below. That is, at a location where a required length of the sheath of the three-phase flat cable is peeled off, the conductor of each core is exposed at the same location in the axial direction. Next, the conductor of each of the branch cables is compressed and connected to the core conductor using a compression sleeve of an appropriate structure, such as a C-shaped sleeve.
Finally, the entire branch connection portion is covered with a mold layer to form a branched cable.

In the disclosed flat cable with branch having the above configuration,
Since the main cable is a flat cable, and its multiple cores are originally arranged in parallel, the main cable before and after the branch connection starts and ends, as shown in the single-core twisted cable shown in Figure 2. There is no need to change or modify the arrangement or shape of the core, and the problems caused by the above items 1 to 2 and the like do not occur.

(Problems to be Solved by the Invention) However, in the flat cable with branches disclosed above,
Since the plurality of wire cores are integrated by a thick sheath, the disclosed flat cable with branching exhibits considerable rigidity. Therefore, when the cables are laid in parallel, the resistance to twisting and bending that must be applied during installation is large, which may cause problems in the work. In particular, the resistance to in-plane bending of a flat cable, so-called edgewise bending, is large regardless of the cable size, and even if a bender is used, it may not be possible to form a desired bend.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a method for extending a cable with a branch, which allows the cable to be extended without causing the problems described above.

[Structure of the Invention (Means for Solving the Problems) The method of extending a branched cable according to the present invention is to set a plurality of single-core cables each having a branched cable connected to a predetermined location and wind it around a drum. The method is characterized in that the drum is transported to a wire drawing site and a plurality of wires are drawn at once.

(Function) In the flat cable of the present invention having the above configuration, the single-core cables forming the main line are separated and are not twisted together, so branching using conventional single-core twisted cables is not possible. There are no problems with cables.

In addition, since a three-phase branched cable is made by drawing three wires at once, there is no resistance to twisting or bending during the wire drawing, which was observed in the above-disclosed flat cable with branching, and it can be easily and smoothly drawn. Line extension can be carried out.

(Embodiment) FIG. 1 is a front view of the entire embodiment of the present invention, and FIG. 2 is a plan view of the main part thereof. In FIG. 1, a set of three single-core cables 13 with branch cables 12 attached at predetermined intervals is wound around a drum 11. The drum 11 is transported to a wire drawing site and supported on a drum frame 14.

During wire extension, the set of three single-core cables 13 are gripped by the cable grip 15 and the three wires are extended at once, as shown in FIG.

At this time, as shown in FIG. 3, the three single-core cables 13 are covered with a wire net 16.

The wire net 16 includes a ring-shaped rope 17 and an untwister 1
The wire 19 is connected to the wire 19 via the wire 8 .

Note that when the wire extension length is large, the wire is extended all at once as shown in FIG. That is, each single-core cable 1
A cable grip 15 is attached to the end of each cable grip 15, and each cable grip 15 is connected to a third letterpress 20 via a ring-shaped rope 17 and an untwister 18'. The wire 19 is connected to the wire 19 via the wire 18 .

[Effects of the Invention] As is clear from the above, by the branched cable drawing method of the present invention, a three-phase cable is constructed by drawing a branched single-core cable that is separately and independently wound around a drum. Therefore, various problems encountered in conventional three-phase single-core twisted cables with branches and flat cables with branches are eliminated.

[Brief explanation of the drawing]

Fig. 1 is a front view of the entire embodiment of the present invention, Fig. 2 is a plan view of its main parts, Figs. 3 and 4 are plan views of modified examples of the main parts, and Fig. 5 is a plan view of a conventional unit. It is a front view of the branch connection part in a core twisted cable. ...Single core cable 14...Drum mount 15...Cable grip 16 Mountain wire net 11...Drum 12...Branch cable 13+2 diagram Figure 14

Claims (1)

[Claims] A set of multiple single-core cables, each consisting of branch cables connected to predetermined locations, is wrapped around a drum.
A method of extending a branched cable, characterized in that the drum is transported to a cable extension site and a plurality of cables are extended at once.