JPS5845469Y2 - Partition plate for disaster prevention trough - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a partition plate for a disaster prevention trough.

Ultra-high voltage OF cable or 154k currently installed in the tunnel
VcV cables are made of flame retardant material to prevent the cables from catching fire due to external fires, and to prevent other cables from being affected even if the cable itself causes a ground fault and ignites the insulation breakdown hole. It is common practice to house cables for each phase or for each line (three phases) in a disaster prevention trough made of reinforced plastic or the like.

If the cable itself causes a ground fault and a fire ignites in the insulation breakdown hole, the supply of fresh air from the disaster prevention trough or outside is cut off, and the interior of the disaster prevention trough gradually becomes depleted of oxygen, allowing the fire to extinguish naturally.

In order to rapidly deplete the cable of oxygen and extinguish the fire in the shortest possible time, partition plates are installed at appropriate intervals along the length of the disaster prevention trough.

The device spacing of the partition plate is Here, ct: Burning speed of insulating oil to: Oxygen deficiency extinguishing time Effective cross-sectional area in S Nidraft vo: initial oxygen concentration ■e = critical combustion oxygen concentration More demanded.

For example, when accommodating one 2751 (VI
x 10”cIn3/min, t □= 10m
1 n.

v.

−0,21,v820.14, then I,=39Q
ocm, and it is necessary to install one place every 4 to 5 snake pitches.

The explosive energy when a ground fault occurs in an ultra-high voltage cable is enormous, and the internal pressure in the trough near the ground fault point reaches over 20 kg/cm2.

For this reason, if the longitudinal gas escape route is blocked by a partition plate, the trough itself may be damaged due to a large increase in internal pressure, and the partition plate may also fall down or be damaged within the trough, causing the trough to collapse after a ground fault. Air circulation in the longitudinal direction cannot be blocked.

For this reason, there was a risk that self-extinguishing would not be possible due to lack of oxygen at the end of the cable ground.

The purpose of the present invention is to provide a partition plate for a disaster prevention trough that can release gas pressure in the longitudinal direction when there is an impactful rise in pressure, and can block the flow of air in the longitudinal direction in a static state.

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 show a first embodiment of a partition plate for a disaster prevention trough according to the present invention.

The disaster prevention trough 1 consists of a U-shaped trough body 2 made of flame-retardant reinforced plastic, etc., and a lid 3 placed over it, and the trough body 2 and the lid 3 have different edges. an edge 2B facing the fitting grooves 2A and 3A provided in the
3B and are airtightly connected.

A cable 4 is accommodated in such a disaster prevention trough 1, and is continuously supported on a spacer 5 made of the same material as the trough 1.

The partition plate 6 has a structure in which a thin flame-retardant rubber sheet is sandwiched between a pair of frame-shaped frames 70 made of flame-retardant reinforced plastic so as to close the space within the frame. There is.

A plurality of strip-shaped slits 9 are provided in the partition plate main body 8.

The partition plate main body 8 and the frame type frame 7 are integrally constructed by bonding their contact surfaces together or by fastening them with screws.

The flame-retardant rubber sheet forming the partition plate body 8 is made of, for example, butyl rubber, neoprene rubber, or the like to which aluminum hydroxide is added.

The thickness of the partition plate main body 8 is, for example, 3 to 5 mm, and the slits 9 are, for example, 1 to 5 mm in width and 20 cIn or less in length, and are provided at intervals of 5 to 10 cm.

The buttons 10 are indirect water cooling pipes arranged at both corners of a part of the disaster prevention trough 1.

By providing the slits 9 in the partition plate 6 in this way, when the gas pressure rises shockingly in the event of a ground fault, high pressure gas can escape in the longitudinal direction inside the disaster prevention trough 1 through the slits 9, preventing damage to the disaster prevention trough 1 and preventing the partition plate from being damaged. Prevents loss or collapse of 6.

When the pressure is released, there is no longitudinal air flow in the partition plate 6, and therefore no new air is supplied to the combustion area.
The fire will be extinguished due to lack of oxygen.

Figures 3 and 4 show a disaster prevention trough partition plate 6 according to the present invention.
This shows a second embodiment of the invention.

This partition plate 6 is made by integrally molding a frame type frame 7 and a partition plate main body 8 using flame-retardant reinforced plastic, flame-retardant rubber, or the like.

The partition plate main body 8 has slits 9 radially formed around one point approximately in the center.

Even with such a partition plate 6, the same effects as in the first embodiment can be obtained.

In particular, since this embodiment can be manufactured entirely by integral molding, the manufacturing cost and processability are excellent.

Further, since the slits 9 are opened radially around one point, abnormal gas at the time of a ground fault can easily escape in the longitudinal direction of the disaster prevention trough 1.

As explained above, in the partition plate for a disaster prevention trough according to the present invention, since a plurality of slits are provided in the main body of the partition plate, when a shocking increase in gas pressure occurs during a ground fault, the gas pressure can be passed through the slits in the longitudinal direction inside the disaster prevention trough. It is possible to prevent damage to the disaster prevention trough and damage or collapse of the partition plate by releasing high-pressure gas.

When the pressure is released, there is no longer a longitudinal air flow in the partition plate, and therefore, no fresh air is supplied to the combustion area, resulting in an oxygen-deficient state, which can extinguish the fire.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional front view of one embodiment of the partition plate according to the present invention in a state in which it is attached to a disaster prevention trough, Fig. 2 is a longitudinal cross-sectional side view with some parts omitted, and Fig. 3 is the other embodiment of the partition plate according to the present invention. FIG. 4 is a cross-sectional front view of the embodiment in a state where it is attached to a disaster prevention trough, and FIG. 4 is a partially omitted vertical cross-sectional side view thereof. DESCRIPTION OF SYMBOLS 1... Disaster prevention trough, 4... Cable, 6... Partition plate, 7... Frame type frame 8... Partition plate main body, 9...
··slit.

Claims (1)

[Scope of utility model registration request] A partition plate for a disaster prevention trough disposed within the disaster prevention trough so as to block air circulation in the longitudinal direction within the disaster prevention trough, characterized in that a plurality of slits are provided in the partition plate main body. Partition board.