JP3455738B2 - Disaster prevention trough for power cable connection - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a disaster prevention trough for a power cable connection.

[0002]

2. Description of the Related Art Electric power cables for supplying electric power to consumers such as houses and business establishments are repeatedly connected at certain intervals in order to make their length long and continuous. If such an electric power cable is laid as it is, the coating of the electric power cable burns in the event of an accident and a fire occurs. Therefore, the electric power cable is usually housed in a disaster prevention trough that can be extinguished by suffocation.

The disaster prevention trough includes a general disaster prevention trough for accommodating the non-connection phase cable and a disaster prevention trough for electric power cable connection for accommodating the connection portion.

FIG. 2 is a perspective view showing a state in which a conventional disaster prevention trough for connecting a power cable is connected to a general disaster prevention trough.

As shown in the figure, the disaster prevention trough 3 for the general part in which the non-connection phase cable 1 and the connection phase cable 2 are accommodated
In between, a disaster prevention trough for power cable connection (hereinafter referred to as "disaster prevention trough for connection") 4 is connected via a reducer 5.

[0006] The disaster prevention trough 4 for the connecting portion comprises an outer trough body 6 having a U-shaped cross section, a trough lid 7 having a U-shaped cross section for covering the outer trough body 6, the outer trough body 6 and the trough lid 7. A fastener 8 provided between the fasteners 8 for sealing the disaster prevention trough 4 for connection, a trough lid floating guide 9 provided outside the fastener 8, an outer trough body 6 and a trough lid 7
The aramid band 10 made of aramid fiber is provided on the outer periphery of the aramid and has a single structure.

In such a disaster prevention trough 4 for connecting portions, a power cable connecting portion (hereinafter referred to as "connecting portion") 1
When an accident occurs at point P of 1, gas is explosively generated,
The trough lid 7 floats by the pressure of the gas. When the trough lid 7 floats, a gap is created between the fastener 8 and the trough lid 7, and gas is released from this gap. When the gas is released, the pressure inside the disaster prevention trough 4 for the connecting portion is reduced, and the trough lid 7 is returned to the outer trough body 6 by the aramid band 10. When the trough lid 7 is returned to the outer trough body 6, the connection disaster prevention trough 4 is sealed and the fire at the accident point is extinguished by suffocation.

FIG. 3 is an explanatory view of another conventional example of the disaster prevention trough for the connecting portion. Note that the trough body, trough lid, and the like are omitted for simplification of description.

In the figure, reference numeral 12 is a fire extinguishing agent pipe provided in the trough body, and the extinguishing agent pipe 12 is provided with a nozzle 1
3 is connected. These extinguishant pipe 12 and nozzle 1
By extinguishing a fire extinguishing agent to the connecting portion 11 with the fire extinguishing equipment consisting of 3, the fire that occurs during an accident is forcibly extinguished.

[0010]

However, in a disaster prevention trough for a connecting portion having a single structure as shown in FIG. 2, the structure of the connecting portion is destroyed by an impact (blast) generated at the time of an accident, and the trough lid or the like is scattered by the impact. Will not be able to seal due to damage to the power cable, and the power cable will continue to burn without a sufficient choking effect, resulting in a major fire.

Further, when the fire extinguishing equipment as shown in FIG. 3 is installed in the disaster prevention trough for the connecting portion, it is necessary to perform maintenance such as periodical inspection such as the presence or absence of clogging of the nozzle and the presence or absence of cracks in the extinguishant pipe.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and provide a disaster prevention trough for a power cable connecting portion, in which suffocation and extinguishing are performed even if an accident occurs at the connecting portion, and maintenance is unnecessary. .

[0013]

In order to achieve the above-mentioned object, the present invention provides a disaster prevention trough for a power cable connection portion for accommodating the power cable connection portion and preventing a fire caused by an accident at the connection portion. A pipe-shaped trough for accommodating the power cable connection portion, and both ends of the pipe-shaped trough provided along the power cable and fixed to the opening end of the pipe-shaped trough and the conduit. And a tubular sheet that releases pressure by expanding with gas generated in an accident.

In addition to the above construction, in the present invention, the pipe trough may be made of FRP and the sheet may be made of aramid fiber.

According to the present invention, when an accident occurs in a power cable connecting portion, an impact force is generated to destroy the connecting portion,
The fragments are scattered. However, since the scattered matter is confined in the radial direction by the pipe-shaped trough, only the blast is blown out in the longitudinal direction of the pipe-shaped trough. The expansion of the sheet by the blast releases the pressure. As a result, the airtightness inside the seat is maintained, and even if a fire occurs at the connection part, the fire is extinguished immediately by suffocation.

When a pipe-shaped trough is made of FRP having excellent impact resistance and a sheet is made of aramid fiber having excellent heat resistance and impact resistance, the disaster prevention capability is increased.

In the present invention, since no fire extinguishing equipment is used, maintenance is unnecessary.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, but the upper half is omitted for simplicity of explanation.

In the figure, reference numeral 21 is a pipe-shaped trough for housing the connecting portion 11. The pipe-shaped trough 21 is formed by fitting two (or three) trough-shaped members made of resin and having a substantially semicircular cross section with a fastener (not shown). The connection phase cable 2 on one side (the lower side in the figure) of the connection portion 11 is closely penetrated through a pipe line 22 made of resin at a constant interval. The connecting phase cable 2 is covered with a tubular sheet 23 extending from a pipe trough 21 to a conduit 22, and a band 24 made of aramid fiber and a band 25 made of SUS are wound around each. Similarly, on the other side (upper side in the figure) of the connection portion 11, the connection phase cable is closely penetrated through the pipe line at a constant interval, and the tubular sheet is fixed between the pipe trough and the pipe line. . That is, the inside of the pipe-shaped trough 21 and the seat 23 is in a sealed state.

The pipe-shaped trough 21, the conduit 22, the seat 23, and the bands 24 and 25 are used for the disaster prevention trough 2 for the connecting portion.
6 are configured. In the drawing, one band 24 and four bands 25 are wound around both ends of the sheet 23, but the number of turns is not limited.

In such a disaster prevention trough 26 for a connecting portion, when an accident occurs in the connecting portion 11, an impact force is generated, the connecting portion 11 is broken, and the fragments are scattered. However, since the scattered matter is confined in the radial direction by the pipe-shaped trough 21, only the blast is blown out in the longitudinal direction of the pipe-shaped trough 21. The blast causes the sheet 23 to expand (as indicated by the alternate long and short dash line), thereby releasing the pressure. As a result, the airtightness inside the seat 23 is maintained, and even if a fire occurs at the connecting portion 11, the suffocation is extinguished immediately. Moreover, since no fire extinguishing equipment is required, maintenance is unnecessary. Further, since the band 24 is wound so as to be inside the band 25, when the sheet 23 expands, the band 24 slightly moves.
The impact of the sheet is absorbed and the sheet 23 is prevented from being damaged.

When the pipe-shaped trough 21 is made of FRP having excellent impact resistance and the sheet 23 is made of aramid fiber having excellent heat resistance and impact resistance, the disaster prevention capability is increased. .

[0024]

In summary, according to the present invention, the following excellent effects are exhibited. (1) According to the present invention, the connecting portion is covered with the pipe-shaped trough, and even if an accident occurs, scattered matter is confined in the radial direction, and only the blast is blown out in the longitudinal direction to expand the sheet. As a result, airtightness is maintained and suffocation extinguishing is performed. (2) Since no fire extinguishing equipment is used in the present invention, maintenance is unnecessary.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a conventional disaster prevention trough for a power cable connecting portion is connected to a general disaster prevention trough.

FIG. 3 is an explanatory view of another conventional example of a disaster prevention trough for a power cable connecting portion.

[Explanation of symbols]

2 connection phase cable 11 Power cable connection (connection) 21 pipe trough 22 pipeline 23 sheets 24, 25 bands 26 disaster prevention trough for connection

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI H02G 9/00 H02G 9/00 B (72) Inventor Shinichi Tsuchiya 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo TEPCO (72) Inventor Mamoru Kurata 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company, Inc. (72) Inventor Toshio Kakihana 5-1-1, Hidaka-cho, Hitachi, Ibaraki Prefecture High factory (72) Inventor Hironori Tomita 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki Hidaka Cable Co., Ltd. Hidaka factory (72) Inventor Kazutoshi Abe 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki No. 1 Hidaka Electric Cable Co., Ltd. Hidaka Plant (72) Inventor Masanori Sudo 881-11, Iizuka-cho, Ota-shi, Gunma Prefecture (72) Inventor Taku Terayama 1-2-2 Miyashita, Sagamihara-shi, Kanagawa Asahi Glass Matex Co., Ltd. House (56) Reference Patent flat 2-41614 (JP, A) JP flat 5-276640 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) H02G 1/06 A62C 3 / 16 F16L 3/08 H02G 9/00

Claims (2)

(57) [Claims] 1. A disaster prevention trough for a power cable connecting part for accommodating the power cable connecting part and for preventing a fire caused by an accident at the connecting part, and a pipe-shaped trough for accommodating the power cable connecting part. A tube provided along both sides of the power cable from both open ends of the pipe-shaped trough and fixed at both ends to the open end of the pipe-shaped trough and the pipeline, and releasing the pressure by expanding with gas generated in an accident Disaster prevention trough for power cable connection, characterized by having a sheet-like shape. 2. The pipe-shaped trough is made of FRP,
The disaster prevention trough for a power cable connecting portion according to claim 1, wherein the sheet is made of aramid fiber.