JPH0340708A - Fireproof structure of floor section penetrated with cable - Google Patents

Abstract

PURPOSE:To improve fireproof performance by fitting a receive metal having a cable penetration hole in the bottom face and an opening in the side wall filled with fireproof putty and rock wool in the floor then applying fireproof putty onto the rising section of the cable thereafter winding a fireproof sheet. CONSTITUTION:A receive metal 4 having cable penetration holes 6 in the bottom face 5 and a plurality of openings (not shown) in the side wall 7 is fitted through an engaging foot section 8 in the cable penetration hole 2 in the floor 1. The receive metal 4 is filled, sequentially from the bottom face 5, with fireproof putty 9, rock wool 10 and fireproof putty 11. Fireproof putty 9, 11 is protruded from the opening of the side wall in order to contact the receive metal 4 tightly with the penetration hole 2. At the section of the cable 3 rising from the floor face 1, a fireproof putty 12 is applied over a length of about 100mm then a fireproof sheet 13 is wound thereon thereafter an adhesive vinyl tape 14 is applied. By such arrangement, fireproof performance is improved by means of small amount of fireproof putty, and a fireproof structure satisfying the requirement of two-hour withstanding performance can be formed easily.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a fire protection structure for a cable floor penetration section where electric wires/cables (hereinafter collectively referred to as cables) pass through the floors of buildings, hotels, condominiums, etc. In particular, it relates to a fireproof structure in which cables passing vertically through a cable floor penetration part are not supported by the cable penetration part but by other parts.

(Prior art) In order to prevent the fire from spreading to other floors through the cable floor penetration when a fire occurs in a building such as a building, hotel, or condominium, it is necessary to provide a fire protection structure at the cable floor penetration. There is. It is well known that this fireproof structure involves filling the floor throughhole with fireproofing material to surround the cables that pass through the floor throughhole. and lower flll (ceiling of downstairs
) is filled with fireproof putty and filled with p-rough wool in the middle to prevent the formation of a gap or flue passing through the through hole up and down.

In addition, for convenience and simplicity of construction, the cables laid vertically through the cable floor penetration section are supported and tied down using cable racks, pedestals, walls, etc., instead of being carried out at the cable penetration section. This is already being done.

These requirements for fire protection performance of cable floor penetrations are
In the case of so-called 1-hour fire resistance, conventional fire prevention methods were sufficient because the maximum temperature reached during heating in disaster prevention tests was relatively low at 840°C, but in the case of 2-hour fire resistance, the above method was sufficient. Since the maximum temperature reached during heating in the corresponding disaster prevention test was over 1000℃, which was severe, the conventionally known fire prevention technology for one-hour fire resistance was completely useless, and it was necessary to develop a new fire prevention structure for the cable floor penetration part. .

A structure has recently been proposed as a cable floor penetration fire protection structure that satisfies the requirement of 2-hour fire resistance.

To explain this based on the drawings, 100 is a concrete floor, and 102 is a cable through hole installed in the floor 1001. Reference numeral 103 denotes a cable laid in a vertical V shape through the through hole 102, and the figure shows a triplex cable in which three single-core cables are twisted together.

Reference numeral 104 denotes a receiving fitting fitted into the through hole 102, which is vertically divided into two parts so that it can be easily attached to the through hole 102 even after the cable 103 is laid through the through hole 102. ing.

The bottom surface 105 of the receiver IL 104 only has a hole through which the cable passes, but the side surface 106 of the receiver 104 has a
As shown in FIG. 4, a large number of holes 107 are provided so that the fireproofing material can be filled in close contact with the wall surface of the through hole, and the side surface 106 is an open surface to the outside. ing. The receiving fitting 104 also includes a collar 108 for securing to the floor surface 101. The receiving fitting 104 functions as a support for the fireproofing material when filling the cable floor through hole with the fireproofing material, and has the advantage of facilitating the filling of the fireproofing material.

It is densely filled with V holes so that there are no gaps. Reference numeral 110 is a filler material filled in the upper part of the fireproof putty layer 109. 1
11 is the upper surface of the through hole 102 and the collar 108 of the receiving metal fitting 104
This is a block of fireproof brackets raised in the shape of a truncated cone on the floor surface 101 to cover the area.

Although it can meet the requirement of 2-hour fire resistance, it requires a large amount of fire protection putty because it is a large truncated conical block of fire protection putty placed on the floor covering the top surface of the through hole. Not only does this require high material costs, but it also requires the troublesome and time-consuming construction work of building up the fireproof material into the desired shape and dimensions. This difficulty becomes more significant as the pore size becomes larger.

In view of the above-mentioned points, the present invention eliminates the installation of fire protection and 1-tub P-sock which causes high cost and troublesome construction, and satisfies the requirement of 2-hour fire resistance with lower cost and easier construction. The purpose of this invention is to propose a new fireproof structure with a cable through hole 1 that can be used as a cable through hole.

(Means for Solving the Problems) In the present invention, in order to achieve the above object, the fireproof structure of the cable floor penetration part was constructed as follows.

(1) Fit a non-combustible receiver with a bottom surface having a cable penetration hole, three side surfaces open to the outside, and a retaining part for the floor surface into one cable penetration hole in the floor.

(2) Fill the inside of the cable penetration hole and the receiver with fireproof material so that there are no gaps or flues that connect above and below the cable penetration hole 1.

(3) For penetration cables above the floor, apply fireproof putty over a length of at least 100m5+ from the floor to cover the surface of the cable sheath and to fill any gaps or gaps in the cable. Paint.

(4) A layer of fire prevention sheet is provided around the outer periphery of the above fire prevention putty application area.

With this configuration, the cables that pass vertically through the cable floor penetration part are not supported at the cable floor penetration part but at other locations, and the requirement for two-hour fire resistance is satisfied with simple construction. A fireproof structure can be obtained.

In the present invention, which is characterized by being configured as described above,
The fireproofing material to be filled in the cable through hole and the receiver is as follows:
Flame-retardant organic polymer materials, fire-resistant or non-combustible materials, foamable fire-prevention 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 more, preferably 35 or more include compositions in which various flame retardants are blended with organic polymer resins. As examples of organic polymer resins, conventionally known ones can be widely used.
For example, olefin homopolymers such as polyethylene, polypropylene, polystyrene, olefin copolymers such as ethylene-propylene rubber, ethylene-propylene-diene rubber, styrene-butane rubber, isobutylene-isoprene rubber, acrylonitrile-butadiene rubber, ethylene-ethyl 7) V-t copolymers, copolymers of vinyl monomers and olefins such as ethylene-vinyl acetate copolymers, polyvinyl chloride, chlorinated polyethylene, polychloroprene, chlorosulfonated polyethylene, epichlorohydrin Other plastics and rubbers such as halogen-containing polymers such as nylon, polyester, and polyurethane are used.

Flame retardants include decabromodiphenyl oxide, hexaprosobenzene, hexabromocyclododecane, dodecacμμpentacyclooctadeca 7115 diene, tetrabromobisphenol A, tribromophenol, tetrabromophthalic anhydride, dibuμmoneobentel glycol, and tetrabromobentel glycol. Bromobisphenol A-bis-(
aryl ether), halogen-containing organic flame retardants such as chlorinated polyethylene, metal oxides such as heptimony trioxide and molybdenum dioxide, alumina hydrate, magnesia hydrate, basic sulfuric acid hydrate, One or more hydrated metal oxides such as basic magnesium carbonate hydrate and basic magnesium phosphate hydrate are used.

Although hydrated metal oxides are particularly preferred, combination systems 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. The flame-retardant organic polymer composition contains the above-mentioned components and, if necessary, other components, such as antioxidants, fillers, pigments, processing aids, and flame-retardant aids (for example, 3ZnO-2B201).
-3H20.

2ZnO-3B20g-3゜5H20, ZnOZnM(
,O,,CaO-ZnMoO4,Zn,(PO4)B-
4H20, composite fired product of ZnO and MgO, ZnO5Zn
C03, zinc-containing compounds such as barium metaborate, titanium oxide, zirconium silicate, tomagnesium carbonate, benquinite, red phosphorus, etc.) are mixed together to form a homogeneous composition, and crosslinked or non-crosslinked. used as is.

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, tetrafluoride polyethylene,
Examples include tetrafluoroethylene polyvinylidene dv 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 bolybdenum, silicone oil, liquid paraffin, and liquid chloroprene polymer. Non-foaming putties) are also preferred.

Examples of fire-resistant or non-combustible materials other than flame-retardant organic polymer materials include glass fiber, ceramic fiber, alumina fiber, inorganic compound whiskers, rock solids, sand, mica powder, etc. It will be done.

Foaming fireproofing material is a general term for materials that thermally decompose themselves to produce foamed carbides when heated to high temperatures, and include at least one of hydrocarbon-based polyhydric alcohols such as pene- and taerythritol.

At least one blowing agent such as melamine, diandiamide, etc.
seeds 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 or a binder that is liquid at room temperature such as polybutyne, silicone oil, liquid halafin, or liquid chloroprene polymer. An example is a composition mixed and dispersed in a binder. When the binder used is a high molecular weight polymer that is solid at room temperature, a composition that can be extruded is obtained, and when the binder used is liquid, a putty-like product is obtained.

As the above-mentioned non-foaming putty and foaming putty, those which have been widely used as fireproofing materials for cable floor penetration parts and fireproofing materials for electric wires and cables are particularly suitable. Special Publication No. 55-39190, Special Publication No. 55-33795
Foaming putty disclosed in Japanese Patent Publication No. 63-460, Japanese Patent Application Laid-Open No. 1987-56. The non-foaming putty disclosed in Japanese Patent No. 10'6935 is an example of such a putty, especially one based on liquid polychloroprene, and especially a hydrated metal acid such as alumina hydrate or magnesia hydrate. The fireproof putty is a combination of toride, inorganic fillers such as clay, zinc borate, pen, and tetite, and heat-resistant fibers such as glass fiber, asbestos fiber, and phenol fiber, and is non-drip and strong enough to maintain the shape of ash. It has excellent properties and can be suitably used in the present invention.

If the fireproofing material to be filled into the receptacle is solid at room temperature, it is best to use it in the form of pulverized or powdered material, and if it is in the form of putty, it is best to fill it in the usual way. When filling the fireproofing material inside the cable through-hole and the receiver, the through-hole It is desirable to fill the pipes sufficiently so that there are no gaps or flues that connect the pipes vertically. The inside of the receiver may be filled with at least one kind of fireproofing material, but the bottom part should be filled with non-foaming putty or foaming putty, and on top of that, a fireproof or noncombustible material such as rock wool should be filled. It is preferable to have a three-layer structure in which non-foaming putty or foaming putty is filled on top.

In the present invention, the cable penetrates above the floor surface, and extends from the floor surface to a length of at least 100 mm, preferably 120 mm or more, so as to cover the sheath surface of the cable.
In addition, if the penetrating cable is a triplex cable or a double-stranded cable and there is a valley or gap between the cable strands, fire prevention putty is applied to fill these gaps. Non-foaming fire putty,
Although foaming fireproofing putty can also be used, non-foaming fireproofing putty is more preferred. Thickness l that covers the cable sheath surface
= 10 trm is preferred.

The constituent material of the fireproof sheet layer formed on the outer periphery of the fireproof putty application area is the flame-retardant organic polymer material with an oxygen index of 30 or more, preferably 35 or more, as described as the fireproofing material to be filled in the receiver. Among these, a non-foamed or foamable material having a mechanical strength that can be formed into a sheet or tape with a thickness of about 0.1 to 5 mm, particularly a sheet or tape of a crosslinked material with the above thickness is preferred. The thickness of the fireproof sheet layer depends on the outermost diameter of the cable, but is usually about 1 to 3 watts.

A specific example of the above-described fireproof structure of the present invention will be explained below based on the drawings.

FIG. 1 is a longitudinal sectional view of a specific example of the fireproof structure of the present invention,
2 is a partially sectional top view taken along line A-A' in FIG. 1. FIG.

In the figure, 1 is a concrete floor, and 2 is a cable through hole. 3 is a cable that passes through the through hole vertically, and includes three cables 31, 32 and 33, and a ground wire 3.
4 are integrated together. In order to simplify the drawing, details of the cross section of the cable 31 are not shown. 44-i is a receiving fitting fitted into the cable through hole 21, similar to that already explained based on FIGS. 3 and 4, and is split into two in the length direction to facilitate installation. The bottom surface 5 of the receiving fitting 4 is provided with a hole 6 through which the cable 3 passes. The side surface 7 of the receiving fitting 4 is formed as a surface open to the outside so that the fireproofing material can be filled in the wall surface of the through hole in sufficient adhesion, as shown in FIG. In this example, the side surface is not perforated as shown in FIG. 4, but has a lattice-like frame (not shown). Reference numeral 8 denotes a leg portion for fixing the bracket 4 to the concrete floor 10.

9 are filled densely so that there are no gaps between the layers of fireproof putty filled in the lower part of the through hole 2. lO is fireproof putty filling layer 9
9 is a rock wool layer filled on top of the rock wool layer; 11 is a fireproof putty layer filled on the top of the rock wool layer;
It is densely packed like a layer of fireproof putty. Incidentally, as described above, the inside of the receiving metal fitting may be filled with only the #'i type fireproofing material. 12 is a penetrating cable assembly above the floor surface,
The fire prevention putty is applied over a length of 120 mm from the top surface of the fire prevention putty filling layer 11 so as to fill all the valleys and gaps between cable twists, and the entire surface of the sheath of the cable 3 has at least the above-mentioned thickness. It is painted so that it is covered with. 13 is the outer periphery of this fire prevention putty coating layer, and the lower end of the fire prevention sheet winding layer is coated with a fire prevention putty layer so as not to create a gap.
It is desirable that at least 5W or more is embedded in 0. Reference numeral 14 denotes a pressing layer of adhesive vinyl tape applied around the fireproof sheet layer 12.

〔Example〕

EXAMPLES The present invention will be described in detail below with reference to Examples and Comparative Examples.

Examples 1 to 7, Comparative Examples 1 to 2 Inner diameter 150 drilled in a concrete floor with a thickness of 100 mm
Polyethylene insulation with an outer diameter of 22 mm in the cable through hole
A cable consisting of three strands of polyvinyl chloride sheathed cables is installed through the cable, and the iron bracket 4, the fireproofing material filled in the bracket 4, and the fireproof putty coating part 12 (sufficiently filled inside the three cables, the cable The fireproof sheet layer 13 (width: 125m, thickness: 14mm) is made by winding approximately 13 turns of fireproof sheet, and the fireproofing material layer filled in the receiving metal fitting 4 is The application length from the top surface was 120+ oa (excluding Comparative Example 1, 50 m in Comparative Example 2), and a polyvinyl chloride tape was applied on top of the application length, as shown in Figures 1 and 2. We created a fireproof structure for the cable penetration hole. The cable was supported by a cable gripper provided on the wall of the upper chamber of the through hole.

At this time, the fireproofing material for filling inside the metal fitting 4, the fireproofing putty coating part 12
, and the constituent materials of the fireproof sheet layer 13 shown below were used in the combinations shown in Table 1.

[Example of fireproofing material for filling inside the metal fitting 4] A-1 = non-foaming fireproofing material with an oxygen index of 80;
Liquid chloroprene polymer (25℃) viscosity is 50,00
0c, st, terminal alkylzantate group) 1'00f
fi amount part, alumina hydrate (average particle size 60 μm) 20
0 M Okibe, alumina hydrate (average particle size 3.5 μm) 3
00 parts by weight, glass fiber (tR fiber diameter 13 μm 1 length 6 →
, and 10 M parts of 7th monium trioxide.

A-2: A non-foaming fireproof putty with an oxygen index of 60 and a liquid chloroprene polymer (viscosity at 25°C of 100.000
c, st, , terminal carboxyl group), 300 parts by weight of alumina hydrate (average particle size 35 μm), and 10 parts by weight of glass fiber (fiber diameter 13 μm, length 131!1 m) bentonite.

A-3 = Foaming fireproof putty, made of polybutene (98
, viscosity at 9°C 4.050c, st,) 100 parts by weight,
It consists of 270 parts by weight of ammonium polyphosphate and 210 parts by weight of methane.

A-4 Neatsku wool [Example of material for fire prevention putty application part 12] B-1: Same as A-1.

B-2: Same as A-2.

B-3: Same as A-3.

[Example of materials for fireproof sheet layer 13] C-1: 150 parts of a composition consisting of 10 parts of chloroprene rubber, 4120 parts by weight of decapromodiphenyloxa, 10 parts by weight of antimony trioxide, and 1 part by weight of 2-mercaptoimidacillin. A vulcanized product with an oxygen index of 80 that was vulcanized at ℃ for 30 minutes.

C-2: Chlorinated polyethylene toot part, tetrabromobisphenol A 20 weight M, antimony trioxide 10
17 parts by weight, 2.5 parts by weight of dicumylperoxy I', and 2 parts by weight of triallyl isocyanate.
A vulcanized product with an oxygen index of 35 that was vulcanized at 0°C for 20 minutes.

C-3 = 30 parts by weight of chlorinated polyethylene, 15 parts by weight of ethylene-bupylene-diene ternary copolymer rubber, 11 parts by weight of ammonium polyphosphate, 13.8 parts by weight of melamine, iii
30.2 parts by weight of dipentaerythritol and 3.5 parts by weight of dicumyl peroquinide at 170°C.
, a foamable vulcanizate cured under conditions of 20 minutes.

The fire protection structure of each cable floor penetration part of the example and comparative example configured as described above was heated for 2 hours according to the heating curve specified in JIS A1304 according to the method specified by the Building Center of Japan.

Height of the penetration cable from the floor after heating for 2 hours 1
The temperature of the cable sheath at 40 fin points was measured.

This measured temperature is shown in Table 1. If it is less than 340℃, it is considered a pass; if it is higher than that, or if flame or smoke appears on the upper side of the floor during or immediately after 2 hours of heating, it is a failure. And so. The results are shown in Table 1.

4. (Effect) The fireproof structure of the cable floor penetration part of the present invention is the same as that of Example 4 above.
As is clear, it has excellent fire protection performance that meets the requirement of 2-hour fire resistance. Moreover, there is no need for a fire prevention pub block in which a large amount of fire prevention putty is piled up to cover the cable penetration hole in the conventional technology, and instead, fire prevention putty is applied to the penetration cable above the floor surface (this fire prevention putty is applied to the penetration cable above the floor). The application of fire prevention putty is also necessary in the case of raising fire prevention putty in the conventional technology), but since it is sufficient to construct a fire prevention sheet layer around it by simply wrapping the fire prevention sheet, the amount of fire prevention putty used is large. The construction work is simple and takes only a short time. That is, according to the present invention, it is possible to realize a fireproof structure for a cable floor penetration part that satisfies the requirement of 2-hour fire resistance, which is significantly lower cost and easier to construct than the prior art V. Also,
Since the cable is supported at a location other than the cable floor penetration part, construction of the penetration hole is easier and simpler.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the fireproof structure of the cable floor penetration part of the present invention, and FIG. 2 is a partially sectional top view taken along line A-A' in FIG. FIG. 3 is a vertical sectional view showing a conventional fire protection structure for a cable floor penetration part, and FIG. 4 is a front view of a receiving metal fitting used in these fire protection structures. In Figures 1 and 2, l: concrete floor, 2: cable through hole, 3: 3-strand twisted cable, 31, 32 and 33; twisted cable 3
Each cable strip, 34: Ground wire, 4: Bracket, 5: Bottom of Bracket, 6: Cable through hole, 7: Side of Bracket, 8
: Retaining leg of the bracket, 9: Fire prevention putty filling layer, 1O: Rock wool filling layer, 11: Fire prevention putty filling layer, 12: Fire prevention putty coating part, 13: Fire prevention sheet layer, 14: Adhesive vinyl tape presser roll In Figures 3 and 4, 100: concrete floor, 101: floor surface, 102 cable through hole, 103: cable, 104: bracket, 10
5: Bottom surface of the receiving metal fitting, 106: Side surface of the receiving metal fitting, 107: Hole in the side surface 106, 108: Engagement flange of the receiving metal fitting, 109; Fire protection/steel filling layer, 110: Rock wool filling layer, 111;
fire putty block

Claims (2)

[Claims] (1) A non-combustible receiver that is fitted into a cable penetration hole in the floor and has a bottom surface with a cable penetration hole, a side surface that is open to the outside, and an engaging part for the floor surface, and a cable penetration in the floor. A fireproofing material layer filled so that there are no gaps or flues for vertically conducting the cable through hole inside the hole and receiver, and a cable on the floor for a length of at least 100 mm from the top surface of the fireproofing material layer. It consists of a fire prevention putty coated part coated to cover the sheath surface of the cable, and a fire prevention sheet layer provided around the outer periphery of the fire prevention putty coated part, and the cable is supported at a place other than the cable floor penetration part. A fireproof structure for cable floor penetrations featuring: (2) The fire-retardant material layer consists of a fire-retardant putty layer filled at the bottom, an inorganic fiber layer filled in the middle, and a fire-retardant putty layer filled at the top, with the lower end of the fire-retardant sheet layer joining the upper fire-retardant putty layer. A fireproof structure for a cable floor penetration part according to claim 1, characterized in that the cable floor penetration part is embedded.