JPH0636642B2 - Penetration device for electric cable - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a penetrating device for penetrating an electric cable in a partition body.

(Prior art and its problems) Conventionally, in electric wire cable penetrating devices in plants such as nuclear power plants, a buried structure having a sealed structure such as a pipe made of aluminum, steel, or stainless steel as an electric wire cable support is used. A large number of electric wires and cables are inserted and supported in a pipe having such a sealed structure.

However, electric wires have a high conductor temperature with respect to the energizing current, and if a large number of tubes are arranged in a sealed tube as described above, the temperature inside the tube will rise abnormally and the heat will accumulate in the tube, It may damage the cable insulation.

As a countermeasure against such heating, a device in which a plurality of heat dissipation holes are formed in a tubular cable support has been devised as in Japanese Utility Model Laid-Open No. 61-14822. However, the heat radiation effect is not sufficient simply by making holes, and since it is tubular, it takes time and effort to perform cable wiring work at the installation site.

Further, the support structure of the tubular cable support is unstable because the end portion in the pipe length direction is supported by the seal structure in a cantilever manner.

(Object of the Invention) An object of the present invention is to provide an electric wire cable penetrating device that can efficiently dissipate the heat of the electric wire cable and that can also perform the work of laying the electric wire cable easily.

Another object is to enable the cable support to be stably supported in a predetermined posture in the embedded pipe having a circular cross-sectional shape.

(Means for Achieving the Object) In order to achieve the above object, the present invention provides a seal structure at one end of an embedded pipe penetrating a partition body, and a plurality of electric cables are provided through the seal structure. In an electric wire cable penetrating device to be inserted into an embedded pipe, an electric wire cable support formed in a trough shape and extending substantially parallel to the embedded pipe is arranged in the embedded pipe, and the electric wire cable support is attached to an inner circumference of the embedded pipe. It is supported on the inner peripheral surface of the embedded pipe via a lower leg and a pair of left and right upper legs so as to be spaced apart from the surface, and a plurality of electric cables are placed on the electric cable support.

(Embodiment) FIG. 1 shows a vertical cross-sectional view (I-I cross-sectional view of FIG. 2) of a penetrating device to which the present invention is applied. In FIG.
The concrete partition wall A having a large width is formed integrally with, for example, the reactor containment vessel wall B, the embedded pipe 1 is embedded in the partition wall A, and a large number of electric wires are embedded in the embedded pipe 1. The cable 5 is inserted. At one end of the embedded pipe 1, for example, at the rear end of the inside of the container, the tubular portion 7a of the seal structure housing flange 7 is provided.
Is welded in an airtight state, and the seal structure housing flange 7 is fixed to the terminal box 2 with bolts or the like. The front end of the embedded pipe 1 is fixed to the front terminal box 3 via a flange 6. The seal structure housing flange 7 is provided with three annular seal structures 8. An electric cable 5'in the terminal box 2 and an electric cable 5 in the embedded pipe 1 are connected to each other in each seal structure 8 and are kept airtight.

A large number of electric cables 5 extending from each seal structure 8 into the embedded pipe 1 reach the other terminal box 3 through the embedded pipe 1. It is supported by a gutter-shaped electric wire cable support 23.

The cable supports 23 are made of, for example, stainless steel, steel, aluminum, etc., and are provided in three pieces. The cable supports 23 are arranged with the partition wall separated from the inner peripheral surface of the embedded pipe 1, and are substantially parallel to the embedded pipe 1 in the front-back direction. Extends to.

In FIG. 2, which is a sectional view taken along the line II-II of FIG. 1, the cable support 23 is formed in an upper-opening half-cylinder shape, and one is arranged in the upper part and two are arranged in the lower part in the embedding pipe 1. The three cable supports 23 are integrally connected by a bracket 24. The cable support 23 is fixed to the inner peripheral surface of the embedding pipe 1 by a lower leg 25 and a pair of left and right upper legs 28. That is, the lower leg 25 extends downward and an adjusting nut 26 is screwed into the lower end of the lower leg 25, and the adjusting nut 26 is pressed against the bottom of the inner peripheral surface of the embedded pipe 1, while the upper leg 28 is radially left and right. A fixed nut 27 is screwed into the upper end of the embedded nut 1 while extending obliquely upward, and the fixed nut 27 is in pressure contact with the inner peripheral surface of the embedded pipe 1.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 1 and shows the arrangement of each seal structure 8. Reference numeral 10 is a fixing member for fixing the seal structure 8 to the seal structure housing flange 7.

When the electric wire cable support 23 having the above configuration is provided,
The heat of the electric wire cable 5 is quickly dissipated upward without staying in the cable support 23. Further, this allows the allowable current of the electric wire cable 5 to be set to a large value, which increases the design margin.

When applying the electric cable 5 on site, the electric cable 5
Can be stored in the cable support 23 simply by placing it from above.

The electric wire cable support 23 can be slid in the front-rear direction by loosening the fixing nut 27 on the upper portion. That is, the fixing nut 27 is loosened, the electric wire cable support 23 is inserted into the embedded pipe 1, and the position in the front-back direction is adjusted. The fixing nut 27 is rotated and pressed against the inner peripheral surface of the embedded pipe to be fixed to the embedded pipe 1.

(Another embodiment) (1) Although the electric wire cable support 23 shown in FIG. 2 is formed in a half-cylindrical shape in cross section, it may be formed in various gutter shapes such as a square box with an open top or an elliptical half. Can be formed. It is also possible to provide a large number of holes in the trough.

(Effects of the Invention) According to the present invention as described above: (1) Since the electric wire cable support 23 is formed in a gutter shape and is arranged at a distance from the inner peripheral surface of the embedded pipe 1, the electric wire The heat from the cable 5 can be efficiently dissipated, so that there is no possibility that the heat may damage the insulating device of the electric wire cable 5.

(2) Since the heat can be efficiently dissipated, the allowable current of the electric wire cable 5 can be set to a large value, the design margin of the wiring and the like becomes large, and the wiring and the like can be easily designed.

(3) Since the upper side is the open electric wire cable support 23,
The electric cable 5 can be housed in the cable support 23 at once from above, which simplifies the cable laying work on site and improves the efficiency of the laying work.

(4) As a structure for supporting the gutter-shaped cable support 23 having an upper opening on the inner peripheral surface of the embedded pipe 1 having a circular cross section, a lower leg 25 and a pair of left and right upper legs 28 are provided. Since it is supported on the inner peripheral surface of the embedded pipe by so-called three-point support, even in the embedded pipe having a circular inner peripheral surface, a predetermined posture,
And can be easily supported in a stable state.

[Brief description of drawings]

1 is a longitudinal sectional view of a penetrating device to which the present invention is applied, FIG. 2 is a II-II sectional view of FIG. 1, and FIG. 3 is a view in the direction of arrow III in FIG. 1 ... Embedded tube, 5 ... Electric wire cable, 8 ... Seal structure, 23 ... Electric wire cable support,
25, 28 ... legs

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Kamishiro 1-2-1, Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Electric Corporation Kobe Works (72) Inventor Toshikazu Edajima Hyogo, Kobe-shi, Hyogo 1-2, Wadasaki-cho, Tokyo Mitsubishi Electric Corporation Kobe Works

Claims (1)

[Claims] 1. An electric wire cable penetrating device, wherein a seal structure is provided at one end of an embedding pipe penetrating a partition wall body, and a plurality of electric wire cables are inserted into the embedding pipe through the seal structure. A gutter-shaped electric wire cable support that extends substantially in parallel with the embedded pipe is arranged in the pipe, and the electric wire cable support is positioned so as to be spaced from the inner peripheral surface of the embedded pipe. An electric wire penetrating device, which is supported on an inner peripheral surface of an embedded pipe through a pair of left and right upper parts, and a plurality of electric wires are placed on an electric wire cable support.