JPH0324184A - Fireproof construction of passage of large-size cable - Google Patents

Abstract

PURPOSE:To let the construction of a passage of a large-size cable at a floor meet the requirements of the two-hour fire-resistant grade by constructing the passage in a specific manner. CONSTITUTION:A cable passage comprises a cable passage hole installed at a floor; a large-size cable 18 passing through the cable passage hole; a fireproof material layer 14 applied to the surface of the part (ranging from the floor level to at least 100mm above) of the large-size cable; and many heat-exhausting pipes 13 installed between the cable 18 and the layer 14.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure in which electric wires or cables (hereinafter simply referred to as cables) penetrate the floor of a building, such as a building, a hotel, or a building. Regarding the fire protection structure of cable floor penetrations. [Prior art] When a fire occurs in a building such as a building, hotel, or building, the fire spreads to other floors through the cable floor penetration holes.To prevent this, Conventionally, a fireproof structure has been installed in this through-hole.As a conventional fireproof structure, fireproofing material is filled around the cable that passes through the floor through-hole.
As shown in Figure 1, when filling with fireproof material,
Fill the upper side (2) of 1+, that is, the floor area, and the lower side (3), that is, the downstairs ceiling side, with fire prevention putty (4) and (4)°,
Rock wool (5) is filled in the middle to prevent the through hole from becoming a flue. Note that 7) in the figure indicates the floor, and (8) indicates the cable. However, in the above fire prevention structure, calcium silicate plates (6), (6) degrees are interposed between the fire prevention putty (4), (4) degree and the floor surface. 4) The stacking height (h) of ゛, (h
〉' is 5, OCm or more. Such conventional fire protection structures generally satisfy the fire protection performance of so-called one-hour fire resistance, but it is difficult to satisfy the performance of two-hour fire resistance.
In the case of large-sized cables with a conductor cross-sectional area of 400 fi" or more, upward heat transfer through the conductor is extremely large, and for this reason it is extremely difficult to meet the requirement of 2-hour fire resistance. [Invention [Problems to be solved by the present invention] The problem to be solved by the present invention is to develop a new fireproof structure for cable floor penetration parts through which large-sized cables pass, and which has fireproof performance sufficient to withstand fire resistance for two hours. [Means for solving the problem] This problem consists of a cable floor penetration hole, a large cable passing through the cable floor penetration hole, and at least the length of the large cable root portion that is cumbersomely located in the cable floor penetration hole. Sa100
Fire protection for a large-sized cable penetration part characterized by comprising a layer of fire-preventing material applied to the surface of the lock part, and a large number of heat exhaust pipes installed between the large-sized cable and the layer of fire-preventing material. Solved by structure. [Operation of the invention] In the present invention, the following means are employed. +11
A layer of fire-retardant material is provided on the surface of at least a 100 fi long portion of the large cable root located on the upper side of the cable floor penetration hole, preferably at least a 300 m long portion. (2) A large number of heat exhausting vibes are installed between the above fireproof material layer and the large-sized cable. In most cases, a fire spreads to the base of the cable and spreads upstairs due to both the heating of the surface of the cable by the hot air blowing out from the gap in the cable floor penetration hole, and the heating from inside the cable due to the heat transmitted through the cable conductor. In the present invention, the heating of the cable surface is dealt with by the structure (11) above, while the heating from inside the cable is dealt with by the structure (2) above.In other words, even if the cable is heated from the inside, a large number of cables are heated. The entire root of the cable is maintained at a low temperature by automatically sucking in cold air and discharging hot air by the heat exhaust pipe.By dealing with heating inside and outside the cable, the above-mentioned problems of the present invention can be solved. In the present invention, a large-sized cable refers to one in which the total cross-sectional area of the conductors in one cable is 400 mm2 or more, particularly 1000 mm2 or more. If the total cross-sectional area of a large number of stranded wire units is 400 mm2 or more in a cable that shares a common cable, such a cable is also a large-sized cable according to the present invention.The present invention is a flat cable. It is particularly preferable to apply the present invention to flat large-sized cables because it has a large effect on cables.The present invention will be explained in detail below with reference to Fig. 2. Fig. 2 shows an example of the fat-fired structure of the present invention. , (a) shows a vertical cross-sectional view, and (b) shows a cross-sectional view taken along the line x-x' of (a). The large size flat cable α● of this book passes through it, and on the upper surface (self) of the floor (1?) there is a hole for narrowing the gap between the cable floor penetration hole aD and the large size flat cable α●. A fireproof plate αQ such as a calcium silicate plate is secured with anchor bolts. A fireproof material layer (self) is applied to the surface of at least a 100 mm long portion of the large cable root located on the upper side of the cable floor penetration hole αυ,
Fireproof material layer (company) and three large flat cables (company)
As shown in the diagram, a large number of heat exhaust pipes are evenly distributed between the bundles. The heat exhaust pipe α- is L-shaped, consisting of a horizontal part extending parallel to the fireproof plate (to) and a vertical part extending parallel to the cable (self).
Both the upper end B and the upper end B are open. Cable (own) in case of fire
When the temperature rises, the air in the vertical part of the heat exhaust pipe (end) is heated and discharged from the upper end B, and at the same time, cold air is sucked in from the lower end A, and thus due to the heat dissipation effect by the heat exhaust pipe (end). , the entire cable a● is maintained at a low temperature. FIG. 2 shows an example of eight exhaust heat pipes Ql used in the present invention, but it is not necessarily limited to this and two or more pipes are sufficient, but cable It is preferable to provide them evenly around the a-shape, and from this point of view, four or more are preferable. The size of the pipe α● should be determined appropriately according to the size of the cable, and the material should be of a material that can withstand heat discharge sufficiently.
A typical example is metal pipes. The length of the fire retardant material layer is preferably at least 500 fi
It is. The inside of the cable floor penetration hole αD under the fireproof plate α- may not be filled, but it may be filled with the same fireproofing material as the structural material described later for the fireproofing material layer (self) or other various heat-resistant or non-combustible materials, For example, it is preferable to fill it with rock wool, sand, mica powder, etc. As the material for the fireproofing material layer (self), flame-retardant organic polymeric materials, foaming fireproofing materials, etc., having an oxygen index of 30 or more, preferably 35 or more, may be used. Typical examples of flame-retardant organic polymer materials having an oxygen index of 30 or higher, preferably 35 or higher include kumikaimono, which is a combination of organic polymer resin and various flame retardants. As an example of the organic polymer resin, a wide variety of conventionally known ones can be used. Combined, styrene-butadiene rubber, inbutylene-isobrene rubber, acrylonitrile-butadiene rubber,
Copolymers of vinyl monomers and olefins such as ethylene-ethyl acrylate copolymers and ethylene-vinyl acetate copolymers, polyvinyl chloride, chlorinated polyethylene, polychloroprene, chlorosulfonated polyethylene,
Halogen-containing polymers such as shrimp chlorohydrin, other plastics such as nylon, polyester, polyurethane, and rubber are used. Flame retardants include decabromodiphenyl oxide, hexapromobenzene, hexabromocyclododecane, dodecachlorobentacyclooctadeca 7,15 diene, tetrabromobisphenol A1 tribromophenol,
Halogen-containing organic flame retardants such as tetrapromophthalic anhydride, dibromoneopentyl glycol, tetrabromobisphenol A-pisu (aryl ether), chlorinated polyethylene, metal oxides such as antimony dioxide and molybdenum dioxide, alumina hydration One or more of hydrated metal oxides such as magnesium oxide, magnesia hydrate, basic magnesium sulfate hydrate, basic magnesium carbonate hydrate, and basic magnesium phosphate hydrate are used. Hydrated metal oxides are particularly preferred, but combinations of halogen-containing organic flame retardants and metal oxides are also preferred. The amount of flame retardant used varies depending on the type of flame retardant and organic polymer resin used, but in general, the amount of organic polymer resin 1
It is about 10 to 100 parts by weight per 00 parts by weight. Flame-retardant organic polymers &l1 substances have all the above-mentioned properties and, if necessary, other substances such as antioxidants, fillers, etc.
Pigments, processing aids, flame retardant aids (e.g. 3ZnO-28x
Os-3HgO, 2ZnO-38tOsJ. 5HxO
SZnO-ZnM*O*, CaO-ZnM. o*, Z
ns(PO*)s-4HtO, condensation sintered product of ZnO and MgO, ZnO s ZnCOs, zinc-containing compounds such as barium metaborate, titanium oxide, zirconium silicate, magnesium carbonate, pennite, red phosphorus, etc.) together. It can be mixed with other materials to form a uniform bottom material, and used either cross-linked or uncross-linked. Other specific examples of flame-retardant organic polymer materials having an oxygen index of 30 or more, preferably 35 or more include high halogen-containing resins,
For example, hard polyvinyl chloride, 47-fluorinated polyethylene,
Examples include tetrafluorinated ethylene/propylene copolymer and polyvinylidene fluoride. In addition, flame-retardant putty-like materials are prepared by mixing and dispersing one or more of the above-mentioned flame retardants, especially hydrated metal oxides, in a binder that is liquid at room temperature, such as polybutene, silicone oil, liquid paraffin, and liquid chloroprene polymer. Non-foaming putty) is also preferred. Foaming fireproofing material is a general term for materials that thermally decompose on their own when heated to high temperatures to produce foamed carbides. , at least one blowing agent such as dicyandiamide, and at least one flame retardant dehydrating agent such as ammonium monophosphate or ammonium polyphosphate, and a high molecular weight polymer binder that is solid at room temperature, polybutene, silicone oil, liquid paraffin, An example is a composition mixed and dispersed in a binder that is liquid at room temperature, such as a liquid chloroprene polymer. If the binder used is a high molecular weight polymer that is solid at room temperature, extrusion is possible. If the binder used is liquid, a putty-like product is obtained. As the above-mentioned non-foaming putty and foaming putty, those that have been widely used as fireproofing materials for cable floor penetrations, electric wires, and cables are particularly suitable. Special Publication No. 55-39190, Special Publication No. 55-33'79
Foaming putty described in Publication No. 5 etc., Special Publication No. 63-
The foamable putties described in JP-A No. 460, JP-A No. 56-106935, etc. are examples thereof, especially those based on liquid polychlorofubrene, especially those based on alumina hydrate. A certain fireproof putty is made of a hydrated metal oxide such as magnesia hydrate, an inorganic filler such as clay, zinc borate, and pennite, and a heat-resistant fiber such as glass fiber, asbestos fiber, and phenol fiber, and is non-drip. It is excellent in shape retention and toughness of the ash, and can be suitably used in the present invention.

If the fireproof material is solid at room temperature, the thickness is 0.5
It may be used as a sheet or tape of about 5 strips and applied in 1 to 5 layers vertically or horizontally with the heat exhaust pipe alpha field along the cable surface. If the fireproof material is putty or putty-like at room temperature, such as the above-mentioned non-foaming putty or foaming putty, place the heat exhaust pipe α$ along the cable surface and apply 0.5~ Just apply it to a thickness of 25 mm. In the present invention, it is preferable that the fire prevention material layer (self) be provided on the surface of the cable (end) as airtightly as possible, and from this point of view, non-foaming putty is used as the constituent material of the fire prevention material layer. or foaming putty is preferable. Furthermore, it is preferable to apply the above-mentioned sheet or tape on top of applying the batt. If a large number of large-sized cable bundles pass through the cable bundles and there are gaps between the cable bundles, it is preferable to fill these gaps airtight with a filler fireproofing material. Non-foaming putty or foaming putty is preferred. [Example] The present invention will be specifically explained with reference to Examples below. Examples 1 to 4, Comparative Examples 1 to 2 300 mm installed on a concrete floor with a thickness of 100 fi
The conductor cross-sectional area is 250 mm in the fi-angle cable floor through hole.
Figure 2 shows a combination of six flat large-sized cables (total conductor cross-sectional area of 1500 mm2) in which six circular cross-section stranded copper conductors of No. The cable was installed through the cable floor as shown in Figure 2, and a half-split iron support was installed in the cable floor penetration hole. This receiving fitting was filled with rock wool, and a calcium silicate plate with a thickness of 40 mm was placed on the receiving fitting so as to close the opening of the cable floor penetration hole.
As shown in Figure 2, eight iron heat exhaust pipes with a diameter of 15 mφ were placed along the roots of the three calcium silicate plates.
On top of that, a layer of fireproof material with the structure shown in Table 1 is placed for a length of 300 m.
It was applied over a period of time. Note that no heat exhaust pipe was used in Comparative Examples 1 and 2. A fire protection test was conducted on the fire protection structure of each cable floor penetration part of the example and comparative example constructed as described above, based on the fire protection test prescribed by the Building Center of Japan. That is, JIS A
No. 1304. The lower part of the floor was heated with a burner for 2 hours to match the fire resistance curve specified in ．． If the measured temperature was less than 340°C, it was considered a pass; if it was higher than that, or if flames appeared on the upper side of the floor during or immediately after 2 hours of heating, the test was judged to be a failure. The results are shown in Table I. In addition, materials A-1 to A- shown in the same table
5 is as follows. A-1: Oxygen index 8
0 non-foaming fireproof putty containing 100 parts by weight of liquid chloroprene polymer (viscosity at 25°C: 50,000 c.st., terminal alkylzantate group), alumina hydrate (
Consisting of 200 parts by weight of average particle size 60μII), 300 parts by weight of alumina hydrate (average particle size 3.5μ), glass fiber (fiber diameter 13μ, length 6μ, 10 parts by weight of antimony trioxide) A-2: Non-foaming fireproof putty with an oxygen index of 60, containing 100 parts by weight of liquid chloroprene polymer (viscosity at 25°C: 100,000 c.st., terminal carboxyl group), alumina hydrate ( Average particle size 3.5μ-
) 300 parts by weight, glass fiber (fiber diameter 13μ, length 1
3 mm, and 10 parts by weight of bentonite.
A-3 Bi-foaming fireproof putty, made of polybutene (98
．． Viscosity at 9°C: 4,050 c. st. ) 100 parts by weight, 270 parts by weight of ammonium polyphosphate, 27 parts by weight of ammonium polyphosphate
0 parts by weight and 270 parts by weight of monopentaerythritol. A-4: 100 parts by weight of chloroprene rubber, 20 parts by weight of decabromodiphenyl oxide, 1O antimony dioxide
A vulcanized product with an oxygen index of 80 was obtained by vulcanizing a combination consisting of 1 part by weight and 1 part by weight of 2-merkabutimidazoline at 150°C for 30 minutes. A-5 = 30 parts by weight of chlorinated polyethylene, 15 parts by weight of ethylene-brobylene-diene ternary copolymer rubber, ammonium II polyphosphate, 13.8 parts by weight of melamine,
A combination consisting of 30.2 parts by weight of diventaerythritol and 3.5 parts by weight of dichlorperoxide was heated at 170°C for 2 hours.
Expandable vulcanizate cured under conditions of 0 minutes. [Margins below] Table 1 [Effects] The problem to be solved by the present invention is to create a new fireproof structure for cable floor penetration parts through which large-sized cables pass, and which has fireproof performance sufficient to withstand fire resistance for two hours. The goal is to develop [Means to solve the problem] This! I! The problem is a cable floor penetration hole, a large cable passing through the cable floor penetration hole, and at least 1 length of the root of the large cable located on the top side of the cable floor penetration hole.
A large-sized cable penetration part characterized by consisting of a fireproofing material layer applied to the surface of the 00 Tsuru part, and a large number of heat exhaust pipes installed between the large-sized cable and the fireproofing material layer. This problem can be solved by fireproof construction. [Operation of the Invention] According to the present invention, a fireproofing material layer is applied to the surface of at least a 100-fi portion of the root portion of the large size cable located on the upper side of the cable floor through hole, and the fireproofing material layer and the large size cable are coated with a fireproofing material layer. By installing a large number of heat exhaust pipes between the cable and the cable, the cable floor through hole through which the large cable passes can be made fireproof enough to pass a two-hour fire resistance test.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a diagram showing a conventional fire protection structure, and Fig. 2 is a drawing showing a fire protection structure according to the present invention. - This is an X-ray cross-sectional view. +11 Cable floor penetration hole Fire protection putty Ron Kuwool floor Lamination height of cable fire protection putty Cable floor penetration hole Fire protection material layer Rock wool fireproof board Floor large size cable Heat exhaust pipe Figure 2 (A)

Claims (3)

[Claims] (1) A fireproofing material layer applied to the surface of a cable floor penetration hole, a large cable passing through the cable floor penetration hole, and a portion of at least 100 mm in length of the large cable root located on the upper side of the cable floor penetration hole. A fireproof structure for a large-sized cable penetration part, characterized by comprising a large number of heat exhaust pipes installed between the large-sized cable and a layer of fireproof material. (2) For large size cables, the cross-sectional area of each conductor is 4
The fireproof structure of a large-sized cable penetration part according to claim 1, which is a cable of 00 mm^2 or more. (3) The fireproof structure of a large-sized cable penetration part according to claim 1, wherein a large number of large-sized cable bundles pass through the cable bundle, and the gaps between the cable bundles are airtightly filled with a filling fire-proofing material.