JPS598410Y2 - cable line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-supporting branched cable line installed in areas that contain a large amount of moisture, such as distribution lines for tunnel lighting.

Generally, when laying cables, you first lay the main cable, then take out the branch cables and construct the power supply line to the load, but if you want to install lighting equipment every few meters in a tunnel etc. It is necessary to take out a large number of branch cables from the cable, and since it contains moisture, it is necessary to thoroughly insulate the conductor connections of the main cable and branch cables, and it takes a considerable amount of work to take out the branches on site. It is expected that it will be difficult.

Conventionally, in view of this situation, so-called cables with branches have been constructed in which the branch portions of the main cable are insulated and hardened at appropriate intervals in the longitudinal direction with plastic molded insulators, and the branch cables are taken out in the form of branches. Proposed.

According to this method, the branch cables are taken out in the form of branches through connection parts that have been molded with good watertightness in advance, and the number and take-out position can be set arbitrarily. This makes it suitable for tunnel lighting wiring that requires branching.

On the other hand, many lighting equipment, such as high-voltage sodium lamps, are required to be grounded compared to regular electric lights, and they are usually installed at high locations in tunnels where they can take up relatively large space. be.

Conventionally, the most commonly used type of wiring that requires grounding on elevated structures is the so-called self-supporting cable, in which support wires are attached vertically to the main cable and fixed with bind wires, and then the support wires are erected to support the cable. , and since metal wires such as steel are used as support wires, it has been considered to use them for grounding.

Figures 1 and 2 show an example of a conventional self-supporting branched cable line that was conceived in view of the above, and is insulated with molded insulators at appropriate intervals in the longitudinal direction. Branch parts 1, 1, 1... are set, and a steel support wire 4 is connected to a bind wire 5 to a trunk cable 3 from which branch cables 2, 2, 2... are taken out in a branch shape. If it is necessary to ground the equipment, connect the grounding cables 6, 6, 6, respectively at a position near the branch 1 of the support wire 4.
Separately connect 7 and take out the ground cable 6 in the form of a branch, align this ground cable 6 with the branch cable 2, and connect each device 8,
8, 8...... and connect it.
The main cable 3 is also supported by constructing the support wire 4. , and by grounding 9 at an appropriate position, the appliances 8, 8, are connected via the grounding cable 6.
8. I am trying to ground it to...

Conventionally, it has been common practice to take out the ground cable and branch cable separately from the ground bus bar and trunk cable, such as support cables, and bring them into the equipment. This method requires separate branch processing, which requires twice the effort and requires handling separate cables. and also required two entry holes in each cable entry section of the appliance, making waterproof sealing difficult and cumbersome in electrical appliances of this type that require waterproof and moisture-proof treatment.

The present invention was made to solve the above-mentioned drawbacks, and in a self-supporting branched cable line for power distribution to appliances that require grounding, metal support wires are integrated in parallel with the main cable, and At appropriate intervals in the longitudinal direction, connect concentric cables with built-in branch insulated conductors and ground wires, with the end of the insulated branch conductor connected to the main cable conductor, and the end of the ground wire connected to the metal support wire. Each connection is branched and taken out in the form of a branch, and each connection is insulated at once with a molded insulator hardened across the metal support wire and the main cable,
By grounding and installing the metal support wire, it is possible to support the main cable and also perform grounding branching in a single integrated state.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below with reference to FIGS. 3 to 5.

10 is a support wire made of metal such as steel, 11 is a trunk cable containing the required number of insulated conductors, and both are a bind wire 12.
, 12, 12, etc. are integrated in parallel in the longitudinal direction, and the metal support wire 10 and the main cable 11 are provided with branch portions 13, 13, 13 at appropriate intervals in the longitudinal direction.
...... is set, and branch lines 14, 14,
14... is taken out in the form of branches.

Each branch line 14, 14, 14... has a required number of branch insulated conductors 15, 15. 15 and ground wire 16 are both housed in a common sheath to form a concentric cable 17, one end of which is directed toward the branch 13.

On the other hand, in the branch section 13, the trunk cable 11 and the metal support wire 10 are unintegrated and placed in parallel at appropriate intervals, and the sheath of the trunk cable 11 is stripped off, and each insulated conductor 11a, 11a, 11a are exposed, and branch insulated conductors 15, 15, 15 led out to the terminals of the concentric cable 17 are connected to the insulated conductors 11a, 1.
Peel off the coating on each of 1 a and 11 a and connect 1
8, 18, and 18, and separately connected the ground wire 16 led out in the same way to the metal support wire 10 for branch connection, respectively, and further straddled the main cable 11 and the metal support wire 10, and A molded insulator 20 extends to the end of the concentric cable 17 and is solidified into one piece.

The connections 18, 18, 18 and 19 are therefore kept in parallel position within the mold insulator 20 and are insulated together.

The connections 18, 19 or molded insulators 20 are formed in the cable manufacturing factory and are connected to the metal support wire 1.
0, trunk cable 11 and concentric cable 17,
17, 17... are mutually integrated.

The cable manufactured in this way is transported to a facility site such as a tunnel, and is installed by fixing the metal support wire 10 to a mounting bracket (not shown) provided on the mounting wall, thereby supporting the main cable 11 along the entire line. and construct a cable line.

Then, the metal support wire 10 is grounded 21 at an appropriate position, and the main cable 11 is connected to a power source to apply electricity.
On the other hand, each concentric cable 17, 17, 17...
・Electrical equipment such as lighting equipment 22, 22, 22...
. . . through one inlet hole 23 and apply a waterproof seal to the branch insulated conductor 15, 15,
15 and grounding wire 16 to each terminal in the device to complete the wiring.

As explained above, according to the self-supporting branched cable line of the present invention, the support wire is installed and grounded on the main line side, and at each branch outlet side, electricity is generated by simply connecting one cable to electrical equipment. It is possible to perform the supply and grounding at the same time, which can greatly reduce the number of man-hours required for this type of wiring that requires multiple branch groundings. Since it has a concentric structure with a built-in grounding wire, it can be finished in a simple shape such as a round shape, simplifying the cable entry hole of electrical equipment and making waterproof sealing reliable and easy. Moreover, the grounding wire,
Since all of the branch insulated conductors are embedded and hardened within the molded insulator, the waterproof performance from the branch to the electrical equipment is extremely good.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a conventional cable line with self-supporting branch, Fig. 2 is an explanatory cross-sectional view taken along line A-A in the same figure, and Fig. 3 is an explanatory diagram of the cable line with self-supporting branch of the present invention. An explanatory diagram showing one embodiment, FIG.
FIG. 5 is a partially cross-sectional explanatory diagram showing details of a branch part of the self-supporting cable line with a branch. 10: Metal support wire, 11: Trunk cable, 15: Branch insulated conductor, 16: Ground wire, 17: Concentric cable, 2
0: Molded insulator, 21: Grounding, 22: Electrical equipment.

Claims (1)

[Scope of utility model registration request] A concentric cable in which metal support wires are integrated in parallel with the main cable, and branch insulated conductors and ground wires are built in in advance at appropriate intervals in the longitudinal direction.
The branch insulated conductor end is connected to the main cable conductor, and the ground wire end is branch-connected to the metal support wire, and taken out in a branch shape, and the respective connection parts are connected to the metal support wire and the main cable. The cable is insulated all at once with a molded insulator hardened across it, and by grounding and installing the metal support wire, it supports the main cable and also integrates branch grounding into a single structure. A cable line with a self-supporting branch, characterized in that it is configured so as to be able to