JPH038011Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention is applicable to fireproof and airtight penetrations of electric wires and cables,
In particular, the present invention relates to a fireproof and airtight penetration part of an electric wire or cable in which a plug or a receptacle is attached to the end of the electric wire or cable.

[Conventional technology and its problems]

Many electric wires and cables for control purposes pass through wall penetration holes between a cable concentration room such as a power plant, substation, or plant equipment and the adjacent control room, but if something happens in the cable concentration room, When a fire occurs, carbon dioxide gas or chlorofluorocarbon gas is generally used to extinguish it. On this occasion,
If the gas or the combustion gas generated by the fire leaks into the control room, the control room will become deficient in oxygen, and there is a risk that a secondary disaster will occur for the personnel in the control room. Therefore, such wall penetration holes for electric wires and cables need to be fireproof and airtight.

A conventional fireproof and airtight structure for a cable through-hole is such that after an electric wire/cable is inserted into the through-hole, the gap between the through-holes is filled with a putty-like fireproof sealing material.

With this fireproof and airtight structure, when filling the sealing material, fine powder of rock wool scatters, causing discomfort to the worker, and it is extremely difficult to completely fill all the gaps in the through hole with the fireproof sealing material, which is difficult in practice. It is impossible to make it airtight.

In addition, as another fire-resistant airtight structure, a hole is made in advance to match the outer diameter of the electric wire/cable to be inserted, and a heat-resistant elastic body whose outer shape matches the wall through-hole is inserted into the wall through-hole, and the electric wire/cable is inserted into the hole. After the cable is inserted, the heat-resistant elastic body is compressed to maintain airtightness, and then the entrance of the through hole is filled with rock wool or fire-resistant putty to create a fire-resistant airtight structure. There is a limit to the number of wires and cables that can be used, and there are also problems with workability and economy.

Furthermore, a "cable bulkhead penetrating section" is proposed in Japanese Utility Model Publication No. 16314/1982, but this proposal has the following problems.

That is, first, the insertion groove of the cleat must match the outer diameter of the cable to be inserted, which makes manufacturing the cleat extremely troublesome and expensive, and limits the number of electric wires that can be inserted.

Second, the gap between the wire and the wire entry groove is filled with a non-crosslinked butyl rubber mixture, but this mixture is not fire resistant and burns when exposed to flame, and polybutene oil is injected into the central space. leaks and the airtightness is lost.

Thirdly, there is a lot of work at the construction site, which is an obstacle to reducing construction costs.

Therefore, the applicant of the present application proposed a "fireproof and airtight unit" in Utility Application No. 183810/1983 (Kokai No. 149417/1983).
However, in cases where a plug or receptacle is attached to the end of the cable and the cable is inserted into a through hole, the plug or receptacle cannot be used. Generally, the outer diameter of wires and cables is larger than that of electric wires and cables, so when inserting the wires and cables into the fireproof airtight unit, a hole larger than the outer diameter of the wires and cables is created, and when the airtight sealing material is later injected, the cables and fireproof wall There is a problem in that the sealing material leaks from the gap created between the two, making it impossible to ensure airtightness.

[Purpose of invention]

In view of the above points, the present invention provides an electric wire/cable that can be easily inserted into an electric wire/cable through hole with a plug or receptacle attached to the end of the electric wire/cable, and has sufficient fireproof airtightness. The purpose is to provide fireproof airtight penetrations.

[Means for achieving the purpose] In order to achieve the above purpose, in the present invention,
A pair of boxes made of non-combustible board material are open at the top or bottom and have a recess with a semicircular cross-section through which electric wires/cables are inserted at the open edges of opposing side plates, and are covered with fire-resistant and flame-retardant putty. The pair of boxes are stacked with the open portions facing each other to form a fireproof wall constituent member, and these constituent members are respectively inserted into both ends of the electric wire/cable through holes formed in the partition wall to form a fireproof wall. A wire/cable is inserted into both fireproof walls through the hollow part, and a liquid sealing material that hardens over time is injected into the central space sandwiched between both fireproof walls. The structure was such that a plurality of small holes were drilled in the surface except for the surface with the hollow part.

[Effect]

In the fireproof and airtight penetration part for electric wires and cables of the present invention as described above, a pair of boxes filled with fireproof and flame-retardant putty are used to insert the electric wires and cables into the through-holes. Since a fireproof wall can be formed at both ends of the wire/cable, even if a plug or receptacle is attached to the end of the wire/cable, the fireproof wall can be easily formed. As the fire-resistant/flame-retardant putty adheres tightly, the fire-resistant/flame-retardant putty protrudes from the small holes in the box body, filling the gaps between each box body and between the box body and the inner surface of the through-hole, and causing the liquid sealing material to be injected later to leak out. By injecting a liquid sealant into the central space of both fireproof walls, small gaps are filled with the sealant. Therefore, even if the outside of the fireproof and airtight penetrating portion is exposed to flame, the heat is blocked by the fireproof and flame retardant putty, and the sealing material does not change in quality and maintains fireproof and airtightness as a whole.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a fireproof wall component is formed by filling a fireproof and flame-retardant putty 7 inside a steel plate box body 1a, which has semicircular hollows 3a on opposing side plates 2a and 2a' with open upper surfaces. 4a and side plates 2b and 2b' facing each other with open lower parts and a semicircular hollow 3b provided at a position opposite to the hollow 3a. Wall component 4
As shown in FIGS. 2 and 3, the box bodies 1a and 1b are placed so that the simulated electric wires/cables 5 with an outer diameter of 20 mmφ to be inserted into the hollows 3a and 3b are positioned so as to face each other. They are placed at both ends of the wire/cable through hole 6 formed in the partition wall A and pressed together.

By repeating the above operations, the fireproof wall structural members 4a, 4
b are stacked and a total of 12 of the simulated electric wires/cables 5 are inserted, and the space remaining above the through hole 6 is filled with the putty, asbestos foam, or the like. On this occasion,
A sealing material inlet 8 and an exhaust port 9 are provided.

A plurality of small holes 13 are provided in the x and y planes of the boxes 1a and 1b, and when the boxes 1a and 1b are stacked, putty protrudes from the small holes 13 and acts as a plug.

After inserting the electric wire/cable 5 into the through hole 6 and providing the fireproof walls 10 at both ends of the through hole 6 as described above, the hopper 11 is attached to the sealing material injection port 8 to make the sealing material 12 fireproof. After it is injected into the central space p between the walls 10 and solidified, the hopper 11 is removed and the inlet 8 and outlet 9 are plugged with fireproof putty.

The fire-retardant putty used in this example was a mixture of liquid chloroprene, aluminum hydroxide, antimony trioxide, a plasticizer, flame-retardant short fibers, etc., but is not limited to this. Rather, it can be selected and used as appropriate as long as it can withstand the fire resistance test described below and maintains a certain mechanical strength after the fire resistance test.

In addition, although iron plates were used for the box body, other noncombustible materials,
The box body can be made of flame retardant material or the like.

In addition, a mixture mainly composed of liquid chloroprene was used as the time-curable liquid sealing material 12;
In addition, any resin that hardens over time, such as urethane and epoxy resin, can be used.

[Efficacy confirmation test]

Next, the results of airtightness tests and fireproof tests conducted to confirm the effects of the present invention will be explained. The airtightness test was carried out using a chamber 41 (45cm x 45cm) as shown in Figure 4.
x 45 cm), the pressure inside the chamber 41 was set to 400 mmAq, and the pressure drop after 60 minutes was measured and found to be 390 mmAq.

The fire resistance test was conducted by IEEE, as shown in Figure 5.
The electric wire/cable penetration part 51 according to the above embodiment is attached to the fireproof board frame 50 in accordance with std634, and the penetration part 5
The front side of 1 was exposed to a flame of 1050°C from burner 52 for 3 hours, and the temperature on the other side was measured and found to be 218°C.

Further, after the above fire resistance test, it was observed whether the putty of the fireproof wall structure had peeled off or not, but no putty peeling was observed.

〔effect〕

As explained above, according to the present invention, a plug or receptacle is attached to the end of the wire/cable to be inserted, so even if the end of the cable is large, it can be passed through the through hole without any problem.
In addition, it can provide a fireproof and airtight penetration part with good fire resistance, airtightness, workability, and mechanical properties, and has extremely high industrial value.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a fireproof wall component, Fig. 2 is a front view of a fireproof airtight penetration part according to the present invention, Fig. 3 is a longitudinal cross-sectional view of Fig. 2, and Fig. 4 is an explanatory diagram of an airtightness test. 5
The figure is an explanatory diagram of the fire resistance test of the present invention. 1a, 1b...Box, 2a, 2a', 2b, 2
b'...Side plate, 3a, 3b...Multure, 4...Fireproof wall component, 5...Electric wire/cable, 6...Through hole, 7...Putty, 8...Seal material injection hole, 9... …
Exhaust hole, 10...Fireproof wall.

Claims (1)

[Scope of utility model registration request] Side plates 2a whose upper or lower surfaces are open and which face each other,
Attach electric wires to the edges of the open surfaces of 2a', 2b, and 2b'.
Holes 3a, 3 having a semicircular cross section through which the cable 5 is inserted
A pair of boxes 1a, 1 made of non-combustible plate material provided with b.
b is filled with fireproof/flame-retardant putty 7, and the pair of boxes 1a and 1b are stacked with the open surfaces facing each other to form a fireproof wall component 4, and this component 4 is used as a partition wall. A fireproof wall 10 is formed by inserting the wire/cable 5 into both ends of the wire/cable through hole 6 formed in A, and the wire/cable 5 is inserted into both fireproof walls 10 through the hollow portions 3a, 3b. A liquid sealing material 12 that hardens over time is injected into the central space P sandwiched between the boxes 1a and 1b.
A fireproof and airtight penetration part for electric wires and cables, characterized in that a plurality of small holes 13 are bored in the surface except for the surface having the hollow parts 3a and 3b.