JPH0822126B2 - Fireproof structure of cable vertical through hole - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fireproof structure of a cable vertical through hole through which a wire and a cable pass through a floor of a building such as a building, a hotel, and an apartment.

(Prior Art) When a fire occurs in a building, hotel, condominium, or the like, the vertical cable through hole has a fire resistance of 2 hours in order to prevent the fire from spreading to other floors through the vertical cable through hole on the floor. It is necessary to provide a fireproof structure having As a fireproof structure that satisfies the requirement for fireproofing for 2 hours, there is a fireproof structure whose longitudinal section is shown in FIG.

Referring to the drawings, 100 is a concrete floor, and 101 is a cable vertical through hole provided in the concrete floor 100. Reference numeral 102 denotes a cable which is vertically laid through the through hole 101. 103 and 104 are fire-resistant partition plates made of calcium silicate, and have cable through holes, respectively.
It has 105 or 106 and is divided in two. Partition plate 103
Is fixed to the upper surface side of the floor 100 with anchor bolts 107,
The partition plate 104 is fixed to the lower surface side of the floor (the ceiling side of the lower floor) by anchor bolts 108. 109 is rock wool filled in the through hole 101, and 110 is a fire preventive formed so as to surround the cables 103 on the partition plate 103 and fill the gaps between the cables, and to cover the through holes 105 of the partition plate 103. It is a block of putty. 111 is a block 110 below the partition plate 104.
Is a block of fireproof putty formed so as to surround the cables 103, fill the gaps between the cables, and cover the through holes 106 of the partition plate 104. The partition plates 104 and 105
A gap between the through holes 105 and 106 and the through cable 103 is filled with fireproof putty.

(Problems to be Solved by the Invention) Although the fireproof structure of the cable vertical through-hole shown in FIG. 1 can satisfy the requirement of fireproofing for 2 hours, silicic acid is provided on the lower surface side of the floor, that is, the ceiling side of the lower floor. Since it is necessary to fix the calcium partition plate 104 and it is necessary to stack the block 111 of the fireproof putty on the lower side of the partition plate 104, there is a drawback that the construction is not easy. Therefore, the construction cost is high. In addition, the partition plate 10
There is also a danger that the fire putty below 4 will fall off.

The present invention does not require any construction on the underfloor side, that is, on the ceiling side of the lower floor, and makes it possible to complete the fire prevention structure of the cable vertical through hole only by construction on the floor upper side, thereby eliminating the above-mentioned difficulties. This is an issue.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, a partition plate made of a refractory material such as calcium silicate is attached only to the upper surface side of the floor so as to cover the through holes of the floor, Alternatively, when pouring concrete on the floor, it is installed so as to block the floor through-hole only in the opening frame that is integrally formed with the floor on the hole surface of the cable vertical through-hole, and the post-through cable is enclosed on this partition plate to be described later. A side wall made of a sheet of fireproof material is formed, and a fireproof putty-like material, which will be described later, is closely packed in the side wall so as not to leave a gap or a flue.

The attachment of the fire-resistant partition plate to the above-mentioned opening frame is also performed on the floor upper side, as will be seen from the examples described later, and the cable vertical through-hole fire protection structure of the present invention is of a construction work for constructing this. Everything can be done above the floor, and by using sheets of fireproof material for the sidewalls, the sidewalls can be provided taking into account cable perimeter and fire putty thickness. In addition, it satisfies the requirement of fire resistance for 2 hours as shown in Examples below.

In the present invention, it is desirable that the side wall made of a sheet of fireproof material formed on the fireproof partition plate has a height of 100 mm or more.

As the fireproof material, a flame retardant organic material having an oxygen index of 30 or more, preferably 35 or more is used. As a typical specific example thereof, a composition in which an organic polymer resin is mixed with various flame retardants is used. As examples of the organic polymer resin, conventionally known ones can be widely used, for example, polyethylene, polypropylene, homopolymers of olefins such as polystyrene, ethylene-propylene rubber, copolymers of olefins such as ethylene-propylene-diene rubber, Styrene-butadiene rubber, isobutylene-isoprene rubber, acrylonitrile-butadiene rubber, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer and other vinyl monomers and olefin copolymers, polyvinyl chloride, chlorinated Halogen-containing polymers such as polyethylene, polychloroprene, chlorosulfonated polyethylene and epichlorohydrin, and other plastics and rubbers such as nylon, polyester and polyurethane are used.

As the flame retardant, decapromodiphenyl oxide,
Hexabromobenzene, hexabromocyclodecane, dodecachloropentacyclooctadeca 7,15 diene, tetrabromobisphenol A, tribromophenol, tetrabromophthalic anhydride, dibromoneopentel glycol, tetrabromobisphenol A-bis- (aryl ether) , Halogen-containing organic flame retardants such as chlorinated polyethylene, metal oxides such as antimony trioxide and molybdenum trioxide, alumina hydrate, magnesia hydrate, basic magnesium sulfate hydrate, basic magnesium carbonate hydrate Or one or more hydrated metal oxides such as basic magnesium hydrate and basic magnesium phosphate hydrate. A hydrated metal oxide is particularly preferable, but a combined system of a halogen-containing organic flame retardant and a metal oxide is also preferable.

The amount of flame retardant used varies depending on the type of flame retardant and organic polymer resin used, but in general, organic polymer resin
It is about 10 to 100 parts by weight per 100 parts by weight. The flame-retardant organic polymer composition contains the above-mentioned components and, if necessary, other components such as an antioxidant, a filler, a pigment, a processing aid, and a flame-retardant aid (for example, 3ZnO-2B ₂ O). ₃ -3H ₂ O, _{2ZnO-3
B 2 O 3 -3.5H 2 O,} ZnO-ZnM 0 O 4, CaO-ZnM 0 O 4, Zn 3 (PO 4)
_{3-4H 2} O, composite sintered product of ZnO and MgO, ZnO, ZnCO _3, barium metaborate, etc. containing zinc compounds, titanium oxide, zirconium silicate, magnesium carbonate, bentonite, red phosphorus,
Etc.) are mixed together to give a homogeneous composition and are used crosslinked or uncrosslinked.

Other specific examples of the flame-retardant organic material having an oxygen index of 30 or more, preferably 35 or more include a high halogen-containing resin such as rigid polyvinyl chloride, tetrafluoride polyethylene, tetrafluoroethylene / propylene copolymer, and polyfluoride. Examples thereof include vinylidene.

As another example of the fireproof material, a foamable fireproof material having a fireproofing property equal to or higher than that of the above-mentioned flame-retardant organic material may be used.

The foamable fireproof material is a general term for materials that thermally decompose to generate foamed carbide when heated to a high temperature. For example, at least one kind of hydrocarbon polyhydric alcohol such as pentaerythritol, melamine, dicyandiamide, etc. Of at least one blowing agent and at least one flame-retardant dehydrating agent such as ammonium monophosphate, ammonium polyphosphate and the like are mixed and dispersed in a high molecular weight polymer binder which is solid at room temperature, for example, the above-mentioned organic polymer resin. The composition or the cross-linked product thereof is exemplified. Tokusho
Those described in 53-24215 can also be preferably used in the present invention.

It is desirable that the fireproof putty-like material that is densely filled in the side wall is filled to a height of 100 mm or more, which is the same as the height of the side wall. A suitable example of such a putty is polybutene,
Flame-retardant putty (non-foaming property) obtained by mixing and dispersing one or more of the above flame retardants, particularly hydrated metal oxides, in a binder that is liquid at room temperature, such as silicone oil, liquid paraffin, and liquid chloroprene polymer. Oxygen index of 50 or more in putty, especially
Over 60 are used. For example, Japanese Examined Japanese Patent Publication No.
Examples include liquid chloroprene described in JP-A-56-106935 and the like, with other materials such as inorganic fillers and heat-resistant fibers, if necessary, added thereto.

As another example of the fireproof putty-like material, a foamable putty-like material having a fireproofing property equal to or higher than that of the non-foaming putty described above is also used. As a suitable example of the foamable putty,
A blend of a hydrocarbon polyhydric alcohol such as pentaerythritol and a foaming agent such as melamine and dicyandiamide and a flame retardant dehydrating agent such as ammonium polyphosphate and tricresyl phosphate in a liquid polymer such as polybutene and liquid paraffin. is there. Further, the putty-like substances disclosed in JP-B-55-33795 and JP-B-53-39190 are also suitable. As the fireproof putty to be filled in the side wall, any of the above-mentioned non-foaming putty and foaming putty can be used, but in the case of using the non-foaming fireproof putty in view of the result of the fire resistance experiment. Is preferable because the temperature rise of the through cable sheath at the height of 120 mm above the floor is small.

Next, a specific example of the fireproof structure of the present invention will be described with reference to the drawings.

FIGS. 2 (a) and 2 (b) are a longitudinal section and a plan view, respectively, of a specific example of the cable vertical penetration fire protection structure of the present invention. In the figure, 1 is a concrete floor, and 2 is a cable vertical through hole provided in the floor 1. Reference numeral 4 is a fireproof partition plate made of calcium silicate and having a thickness of 40 mm, and having a cable through hole 5. The partition plate 4 is fixed to the upper surface side of the floor 1 by an anchor bolt 6 so as to cover the through hole 2 of the floor, and the through hole 5 is provided with a cable 3 (the cross section of the cable 3 is not shown in order to simplify the drawing. ) Penetrates vertically. The divider is also split in two for ease of mounting.
7 is a side wall formed on the partition plate by a fireproof sheet having a composition described later to surround the cable 3 and having a width of 125 m.
A fire-proof sheet having a thickness of 0.5 to 5 mm and a thickness of 0.5 to 5 mm is wound about 1.3 turns so as to wrap around 20 to 30 mm, and a metal band 8 is wound around the outer periphery of the fireproof sheet. 9 is a gap inside the side wall 7,
It is a fireproof putty that is densely packed so as not to leave a flue.

Furthermore, a vertical sectional view and a plan view of a cable vertical through-hole fire protection structure of another embodiment of the present invention are shown in FIGS. 3 (a) and 3 (b), respectively.
Is shown in. In the figure, 1 is a concrete floor,
2 is a cable vertical through hole provided in the floor 1. Reference numeral 10 is an opening frame made of metal attached to the through hole, which is formed integrally with the floor when pouring concrete on the floor. Reference numeral 11 denotes a ridge provided on the outer peripheral surface of the opening frame, which is embedded in concrete. 12 is a shelf provided at the lower end of the opening frame. Reference numeral 4 is a fire-resistant partition plate made of calcium silicate and having a thickness of 40 mm, and provided with a cable through hole 5. The partition plate 4. is placed on the shelf 12 of the opening frame so as to close the cable through hole 2 on the floor. The partition plate is also divided in half for the convenience of wearing. Reference numeral 7 is a side wall formed in the same manner as in the above-mentioned specific example, and 9 is a fire-proof putty-like material filled in the side wall as in the specific example. 8 is a band wound around the side wall.

Various modifications can be made to the shape of the opening frame, its fixing method to the concrete floor, and the fixing method of the fire-resistant partition plate to the opening frame. For example, the shelves may be provided not at the lower end side of the opening frame but at the upper end side or in the middle thereof. Further, as shown in the longitudinal sectional view in FIG. It is also possible to use the opening frame 10 provided with the ridges 14 embedded therein. In this case, the refractory partition plate is screwed to the upper surface side of the flange 13.

In any case, in the case of this specific example, it is not necessary to provide an anchor bolt, which is convenient in construction.

〔Example〕

The effects of the present invention will be shown below with reference to examples. The following fireproof material sheets and fireproof putty-like materials used in the following examples were used.

[Example of fireproof material sheet]

A-1: 100 parts by weight of chloroprene rubber, 20 parts by weight of decabromodiphenyl oxide, 10 parts by weight of antimony trioxide,
A 1.4 mm-thick sheet made of a vulcanizate having an oxygen index of 80 obtained by vulcanizing a composition comprising 1 part by weight of 2-mercaptoimidazoline at 150 ° C. for 30 minutes.

A-2: 100 parts by weight of chlorinated polyethylene, 25 parts by weight of tetrabromobisphenol A, 15 parts by weight of antimony trioxide,
A 1.4 mm thick sheet made of a vulcanizate having an oxygen index of 38 obtained by vulcanizing a composition comprising 2.5 parts by weight of dicumyl peroxide and 2 parts by weight of triallyl isocyanate at 170 ° C. for 20 minutes.

A-3: Effervescent composition comprising 30 parts by weight of chlorinated polyethylene, 15 parts by weight of ethylene-propylene-diene terpolymer rubber, 11 parts by weight of ammonium polyphosphate, 13.8 parts by weight of melamine, and 30.2 parts by weight of dipentaerythritol. A sheet with a thickness of 2.0 mm.

(Fireproof Putty Material) B-1: Non-foaming fireproof putty with an oxygen index of 80, which is 100 parts by weight of a liquid chloroprene polymer (viscosity at 25 ° C .: 50,000 c.st., terminal alkyl xanthate group), 200 parts by weight of alumina hydrate (average particle size 60 μm), alumina hydrate (average particle size)
3.5 μm) 300 parts by weight, glass fiber (fiber diameter 13 μm, length
6 mm) 20 parts by weight, antimony trioxide 10 parts by weight.

B-2: Non-foaming fireproof putty with oxygen index of 60, 100 parts by weight of liquid chloroprene polymer (viscosity at 25 ° C., 100,000 c.st., terminal carboxyl group), alumina hydrate (average particle size)
3.5 μm) 300 parts by weight, glass fiber (fiber diameter 13 μm, length
13 mm) 30 parts by weight, bentonite 10 parts by weight.

B-3: Foamable fireproof putty, 100 parts by weight of polybutene (viscosity 4,050 c.st. at 98.9 ° C.), ammonium polyphosphate 2
70 parts by weight, 270 parts by weight of melamine, and 270 parts by weight of monopentaerythritol.

Using the above materials, create a cable vertical penetration fire prevention structure with the structure shown in Fig. 2 or 3, and according to the method specified by the Japan Building Center, follow the heating curve specified in JIS A 1304 for 2 hours. Heating was performed.

Height of the through cable from the floor after heating for 2 hours
The temperature of the cable sheath at the point of 120 mm was measured.
This measured temperature is shown in Table 1 together with the materials used and the structure (distinction between FIG. 2 and FIG. 3). The case where the temperature was lower than 340 ° C was regarded as a pass, and the case where the temperature was higher than this, or when a flame or smoke appeared on the upper side of the floor surface during or immediately after heating for 2 hours, it was judged as a failure.

In addition to the above, when using a sheet of fire-retardant material having a low flame retardant oxygen index of less than 30, and also as a putty having an oxygen index of less than 50 low flame retardant In general, there was a tendency that sufficient fire protection performance was not achieved.

(Effect) As is apparent from the above examples, the fire prevention structure of the cable vertical through hole of the present invention has excellent fire prevention performance that satisfies the requirement of fire resistance for 2 hours. Moreover, since all the construction work for constructing the fireproof structure can be performed on the upper side of the floor, and no work on the lower side of the floor (on the ceiling side of the lower floor) is required, the work is easy. Further, by using a fireproof sheet for the side wall, the side wall can be provided by cutting the sheet into a length corresponding to the cable perimeter and the fireproof putty thickness in consideration of the cable perimeter.
Therefore, since it is possible to process and attach the sheet at the construction work site, it is possible to build an optimal fire prevention structure on the spot and facilitate the construction of the fire prevention structure,
Construction time is also short. In addition, the construction can be performed safely and reliably. Further, it is one of the advantages that the present invention does not use rock wool, which is not feared to have the problem of silicosis.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional fire protection structure for a vertical penetration portion of a cable, FIGS. 2A and 2B are a vertical cross-sectional view and a plan view of a first embodiment of the present invention, and FIG. (A) and (b) are a longitudinal section and a plan view of a second embodiment of the present invention. FIG. 4 is a vertical sectional view showing a modified example of the opening frame in the second embodiment of the present invention. In FIG. 1, 100: concrete floor, 101: vertical cable through hole, 102: cable, 103 and 104: fireproof partition plate, 105 and 106: cable through hole, 107 and 108: anchor bolt, 109: rock wool , 110 & 111: Flame-retardant putty blocks. In FIGS. 2, 3 and 4, 1: concrete floor, 2: cable vertical through hole, 3: cable, 4: fireproof partition plate, 5: cable through hole, 6: anchor bolt, 7: Side wall made of flame-retardant sheet, 8: band, 9: flame-retardant putty, 10: open frame, 11 and 14: ridge (embedded in concrete), 12: shelf, 13: flange.

Claims (2)

[Claims] 1. A fireproof partition plate having a cable through hole is locked on the upper surface of the floor so as to cover the vertical through hole of the floor, and a cable passing through the cable through hole of the partition plate is surrounded on the partition plate. As described above, a fireproof structure for a vertical cable through hole, characterized in that the fireproof material sheet is formed into a side wall and the inside of the side wall is densely filled with a fireproof putty-like material. 2. A fireproof partition plate having a cable through hole is locked to an opening frame integrally formed with the vertical through hole of the floor so as to close the vertical through hole of the floor, and the partition plate is placed on the partition plate. A side wall made of a sheet of fireproof material is formed so as to surround a cable penetrating the cable through hole of the plate, and a fireproof putty-like material is densely filled inside the side wall. Fireproof structure.