JPH11236739A - Fire-preventive construction of cable penetrating section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable penetrating section having a simple structure, being easily executed, displaying a high fire protecting performance and capable of readily coping with the extension and removal of a cable. SOLUTION: Power cables 7... in a penetrating section are surrounded by a first fire-preventive sheet 3A, an opening section 5 in the penetrating section is closed with a section fire-preventive sheet 3B from both sides, the front end sections of the second fire-preventive sheet 3B are bent, the bent sections are superposed to the first fire-preventive sheet 3A, and the superposing sections are filled with an uncured type heat-resisting sealing material 11. The laminated sheet of a flame-retardant rubber sheet and a metallic sheet is used as the first and second fire-preventive sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable penetration portion which can prevent a fire from spreading by using a fire protection structure at a portion where cables such as power cables and communication cables penetrate walls and floors of a fire section of a building. The fire prevention structure.

[0002]

2. Description of the Related Art When an electric power cable or the like penetrates a floor or a wall of a fire protection section of a building according to the Enforcement Order of the Building Standard Law, it is determined that the penetration has the same fire resistance as the floor and the wall. I have. Various types of fire prevention structures satisfying such criteria have already been proposed and implemented. For example, Japanese Patent Publication No. 4-70853, Japanese Patent Publication No. 7
A fire prevention structure disclosed in JP-B-36665 and various fire prevention measures approved by the Japan Building Center are known.

[0003] However, these conventional fire prevention structures have drawbacks such as poor workability, large fluctuations in fire prevention characteristics depending on the quality of the work, and troublesome work when adding or replacing cables. I have.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fire prevention structure for a cable penetrating portion which solves the above-mentioned various disadvantages of the conventional fire prevention structure.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to surround a cable of a penetration portion with a first fire protection sheet and close the opening of the penetration portion with a second fire protection sheet from both sides thereof, thereby forming a second fire protection sheet. The front end of the fire protection sheet is brought into contact with the first fire prevention sheet, and the front end of the second fire protection sheet is superimposed on the first fire prevention sheet at the abutting portion. With a structure filled with seals,
The problem is solved by using a laminated sheet of a flame-retardant rubber sheet and a metal sheet for the first and second fire protection sheets.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
First, the fireproof sheet used in the present invention will be described. The applicant of the present application has previously filed a patent application (Japanese Patent Application No. 9-208105, “Fire Protection Sheet”
Filed on August 1, 1998 or Japanese Patent Application No. 10-30234,
FIG. 1 shows an example of the fire protection sheet. The fire protection sheet was filed on February 12, 1998.

[0007] In the figure, reference numeral 1 denotes a flame-retardant rubber sheet. The flame-retardant rubber sheet 1 is laminated and integrated with a metal sheet 2 to form a fireproof sheet 3. The rubber mixture constituting the flame-retardant rubber sheet 1 has an oxygen index (OI) of 28 or more,
It preferably has a high flame retardancy of 30 or more, and contains 0 to 350 mg / g of hydrogen halide gas such as hydrogen chloride during combustion.
Preferably, it is composed of an admixture having a property of generating 0 to 80 mg / g.

[0008] The oxygen index here is based on JIS K7201.
And the amount of hydrogen halide gas generated during combustion is based on the measurement method specified in IEC-754-1. If the oxygen index is less than 28, the fire protection sheet 3 itself tends to burn, and the effect of preventing fire spread becomes insufficient. Further, even if the amount of generated hydrogen halide gas exceeds 350 mg / g, the increase in the effect of preventing fire spread no longer occurs, and moreover, a large amount of hydrogen octylogenide gas is generated, which is inconvenient. The thickness of the flame-retardant rubber sheet 1 is from 0.1 to 3 mm, preferably from 0.5 to 3 mm.
If it exceeds mm, the sheet itself becomes heavy, and the handleability is poor.

[0009] The rubber mixture constituting the flame-retardant rubber sheet 1 includes those which generate hydrogen halide gas at the time of fire spread;
There are two types that do not generate, but examples of generating a hydrogen halide gas include halogenated rubber-based admixtures such as polychloroprene-based, chlorinated polyethylene-based, and chlorosulfonated polyethylene-based or nitrile rubber-based. There is a mixture of a halogen-free flame retardant with a non-halogen rubber such as butyl rubber, ethylene propylene or natural rubber. This type of admixture generates hydrogen halide gas upon combustion. Rubber mixtures that do not generate hydrogen halide gas include non-halogen rubbers such as ethylene-vinyl acetate copolymer, butyl rubber, ethylene propylene rubber, and natural rubber, and water-containing inorganic compounds such as aluminum hydroxide and magnesium hydroxide. In a large amount as a halogen-free flame retardant.

Among these admixtures, the rubber admixture that generates hydrogen halide gas during combustion is preferably a polychloroprene admixture. For example, 100 parts by weight of chloropyrene rubber and 10 parts by weight of magnesium hydroxide are used. 2
00 parts by weight, 5 to 50 parts by weight of antimony oxide, 15 to 50 parts by weight of phosphate frit, 0.1 to 5 parts by weight of antioxidant, 10 to 100 parts by weight of inorganic filler, 5 to 50 parts by weight of carbon black, etc. Is most preferable because carbonized and solidified after the combustion of the flame-retardant rubber sheet 1 and cannot surround the wires and cables and block the air even after the combustion. The rubber admixture that does not generate hydrogen halide gas during combustion is preferably a polyolefin-based admixture. For example, 100 parts by weight of ethylene propylene rubber (EPM) or ethylene propylene diene rubber (EPDM) is mixed with 50 parts by weight of magnesium hydroxide. To 300 parts by weight, phosphate frit 5 to 50 parts by weight, antioxidant 0.1 to 5
Parts by weight, 10 to 100 parts by weight of an inorganic filler, 5 to 50 parts by weight of carbon black, and the like are preferable.
This admixture also has the property of being carbonized and solidified after combustion.

The flame-retardant rubber sheet 1 has an oxygen index of 28 or more and does not generate hydrogen halide gas.
A laminated rubber sheet having a thickness of 0.2 to 3 mm obtained by applying a thermally foamable rubber mixture having a foaming degree of 4 times or more to both sides of a woven fabric having a thickness of 0.1 to 0.5 mm can also be used. The thermally foamable rubber compound has an oxygen index of 28 or more,
Preferably, it has high flame retardancy of 50 or more, does not generate hydrogen halide gas such as hydrogen chloride during combustion, and has the property of foaming when heated, and having a foaming degree of 4 times or more and solidifying. It is composed of a mixture.

Specific examples of such a heat-foamable rubber compound include rubber containing no halogen element such as butyl rubber, ethylene propylene rubber, natural rubber, ethylene-vinyl acetate copolymer, aluminum hydroxide, and the like. Examples include a large amount of a water-containing inorganic compound such as magnesium hydroxide, and a compounded chemical blowing agent such as azodicarbonamide, dinitronepentamethylenetetramine, and 4,4-oxybisbenzenesulfonylhydrazide. Among them, those mainly composed of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 6 to 90% by weight and blended with the above-mentioned hydrated inorganic compound, foaming agent, antioxidant, carbon black and the like are preferable.

The woven fabric is made of natural fibers such as cotton, hemp and jute, synthetic fibers such as nylon, polyester and acrylic, regenerated fibers such as human silk, and inorganic fibers such as glass fiber and carbon fiber. Thickness 0.1 ~
A woven fabric having a thickness of 0.5 mm and a basis weight of 10 to 300 g / m ² is used. To apply the heat-foamable rubber mixture to the fabric, the mixture is dissolved in an organic solvent such as xylene, toluene, or MEK to obtain a paint having a solid content of 10 to 80% by weight. It is performed by coating and drying, and the thickness of the obtained laminated rubber sheet is 0.2 to 3 mm,
Preferably, the coating amount is adjusted to be 0.3 to 0.5 mm.

The metal sheet 2 has a melting point of iron, steel, copper, copper alloy, aluminum, aluminum alloy, etc.
A metal foil having a thickness of 15 to 200 μC or higher.
m1 is used. A metal having a melting point of less than 600 ° C. is unsuitable because it melts in a fire and cannot maintain its shape. If the thickness is less than 15 μm, the effect of the metal sheet 2 cannot be obtained, and if it exceeds 200 μm, the flexibility of the fire protection sheet 3 is reduced, which causes inconvenience in handling.

The lamination and integration of the flame-retardant rubber sheet 1 and the metal sheet 2 can be easily performed by using an adhesive such as a rubber-based adhesive. The dimensions of the fire protection sheet 3 are not particularly limited, but are usually 40 to 100 c in width.
m, and a roll having a length of 10 to 20 m is preferable in terms of productivity, workability, and the like.

The fireproof sheet 3 used in the present invention includes a flame-retardant rubber sheet 1 and a metal sheet 2 each.
The sheet may be laminated and integrated one by one, and a flame-retardant plastic film having a radiation coefficient of 0.5 or more may be bonded to the surface of the metal sheet 2 so that heat radiation is efficiently performed. As the flame-retardant plastic film having a radiation coefficient of 0.5 or more, a non-halogen flame-retardant plastic film obtained by blending a large amount of a water-containing inorganic compound such as aluminum hydroxide or magnesium hydroxide with a resin such as polyethylene or polypropylene. For example, a non-halogen flame-retardant plastic film having a surface coated with a deep-colored paint or the like may be used.

Such a fire prevention sheet has the following fire spread prevention effect. That is, IEEE38
A wire and cable having flammability enough to burn down in the cable vertical combustion test specified in 3 is used as a sample, and the wire and cable to be used as a sample are surrounded by the fire prevention sheet in a Steiner tunnel horizontal combustion. In the Capel combustion test using a furnace (ASTME 84-91), the fire extinguishes spontaneously and exhibits an effect of preventing the spread of fire to a level not to burn down. Also, in the combustion test in the category A of the cable vertical combustion test specified in IEC332-3, similarly, the effect of preventing the spread of fire to a level that does not completely burn out the electric wires and cables serving as the samples is shown.

Next, an example of the fire prevention structure of the present invention using the above fire prevention sheet will be described with reference to FIGS. FIG. 2 and FIG. 3 show an example of a fire protection structure in a wall penetration of a fire protection section of a building. 2 and 3, reference numeral 4 denotes a fire-resistant wall such as a concrete wall. The fire-resistant wall 4 has a rectangular opening 5 formed therein. The opening area of the opening 5 is usually 0.6 m ² or less.

In the opening 5, a plurality of power cables 7, 7,... Laid on a cable rack 6 are pierced and laid. A first fire prevention sheet 3A is wound around portions of the power cables 7, 7,... Located at the openings 5. The first fire protection sheet 3A is provided with the above fire protection sheet 3
And the first fire-prevention sheet 3A such that the flame-retardant rubber sheet 1 is on the inside and the metal sheet 2 is on the outside.
It is wound.

The first fire-prevention sheet 3A is wound from both sides of the fire-resistant wall 4 such that the first fire-prevention sheet 3A having a predetermined size is directed toward the back of the opening 5 as shown in FIG. Two fire protection sheets 3A, 3A near the center
Insert until it overlaps by about 20 cm.
Are wound in the lateral direction of the power cables 7, 7,...
Is formed, thereby sealing it as a tubular shape and tying it with several stainless steel bands 8, 8,....

On the other hand, on both sides of the opening 5 of the fire-resistant wall 4, the opening 5 is closed, and the fire-resistant wall 4 is in contact with the first fireproof sheet 3 A surrounding the power cables 7. A second flat fire prevention sheet 3B is attached. The second fire protection sheet 3B is attached to the
Of the second fire protection sheet 3B at the entire periphery of
Mold channel steel 9,9 ... and concrete bolts 10,1
0... And mechanically fixed to the refractory wall 4. The second fire prevention sheet 3B is also attached such that the flame retardant rubber sheet 1 is exposed inside and the metal sheet 2 is exposed outside.

The end portion of the second fire sheet 3B is in contact with the first fire sheet 3A surrounding the power cables 7, 7,.
As shown in the figure, the end of the second fire protection sheet 3B is
The sheet is bent about Lcm to form an L-shaped cross section, and the bent portion is placed on the first fireproof sheet 3A.
And the joint (gap) formed by this superposition
The uncured heat-resistant sealing material 11 is applied and filled in the bent portion to seal it.

The uncured heat-resistant sealing material 11 is a putty-like material obtained by blending a filler, a flame retardant, a stabilizer and the like with an unvulcanized rubber such as polychloroprene, and has a high oxygen index of 80 or more. It has flame retardancy, forms a solidified layer when heated to a high temperature, has high fire resistance, and is non-curable, so it has good workability and is easy to remove. Specifically, there is “F-Seal” (product name) sold by the present applicant.

The uncured heat-resistant sealing material 11 is used for joints between the fixed portions of the second fire-prevention sheet 3B to the wall 4 and the gaps between the end portions of the first fire-prevention sheet 3A and the power cables 7, 7,. Is also filled. Also, the first fire protection sheet 3A
The sealing material 11 may be filled in the entire space or a part of the space surrounded by. In this example, since the size of the opening 5 is larger than the width of the raw material of the second fire protection sheet 3B, as shown in FIG.
B is used two on each side of the opening 5, and the ends thereof are folded together to form the connection portion 13.

In such a fire prevention structure, the construction can be performed easily and quickly. That is, the raw material of the fire protection sheet 3 can be easily cut with scissors or the like, whereby the first and second fire protection sheets 3A and 3B can be easily prepared. The first and second fire protection sheets 3A, 3B
Then, the cable rack 6 and the power cables 7 are surrounded, the opening 5 of the fire-resistant wall 4 is closed, and the non-curable heat-resistant sealing material 11 is filled in the essential places, thereby completing the construction.

The power cable 7 penetrating through the opening 5
Even if the number slightly increases, the entire structure is surrounded by the first fire protection sheet 3A, so that no trouble is required. Furthermore, there is no need to fill the empty space inside the opening 5 with anything.
There is no need for this much work. In addition, when the power cables 7 are added, removed, exchanged, etc., since the hardening type sealing material is not used, the sealing material 11 can be easily removed, and the stainless steel bands 8, 8. The cable rack 6 can be exposed simply by opening the second fire prevention sheet 3B, and the work can be easily performed.

Further, since the fire prevention sheet 3 has an extremely high fire spread prevention effect as described above, if the metal sheet 2 is made of stainless steel, it can withstand a high temperature of about 1300 ° C., thereby providing a simple structure. Nevertheless, it exhibits a fire protection performance of about 2 hours similar to the conventional fire protection structure.

In the present invention, not only the cable and the penetrating portion of the fire-resistant wall 4 described above but also a penetrating portion of a floor or a wiring board can have a similar structure, and excellent fire prevention performance is exhibited. Further, it goes without saying that the present invention can be applied to not only the electric cables 7 but also the penetrating portions of control cables and communication cables.

[0029]

As described above, according to the fire prevention structure of the cable penetrating portion of the present invention, the structure is simple, the construction can be performed easily, quickly and inexpensively. In addition, it exhibits excellent fire protection performance equivalent to the conventional fire protection structure. Furthermore, it is possible to flexibly and easily cope with addition and removal of cables. In addition, since the construction is simple, it is possible to obtain an effect such that it is difficult for the fire prevention performance to be good or bad.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a fire protection sheet used for a fire protection structure of the present invention.

FIG. 2 is a schematic sectional view showing an example of the fire protection structure of the present invention.

FIG. 3 is a schematic front view showing an example of the fire protection structure of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flame retardant rubber sheet, 2 ... Metal sheet, 3 ... Fireproof sheet, 4 ... Fireproof wall, 5 ... Opening, 7 ... Power cable, 3A
... first fire sheet, 3B ... second fire sheet, 11 ...
Non-curable heat-resistant sealing material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Katsuji Takahara 1800 Kishioka-cho, Suzuka City, Mie Prefecture Inside Fujikura Suzuka Factory

Claims (1)

[Claims] 1. A fire prevention structure for a cable penetration portion such as a wall or a floor of a building, wherein a cable of the penetration portion is surrounded by a first fire prevention sheet, and an opening portion of the penetration portion is surrounded by a second fire prevention sheet from both sides thereof. Respectively, so that the leading end of the second fire sheet is brought into contact with the first fire sheet. At this contact portion, the leading end of the second fire sheet is overlapped with the first fire sheet. A cable having a structure in which an uncured heat-resistant sealing material is filled in gaps of overlapping portions, and a laminated sheet of a flame-retardant rubber sheet and a metal sheet is used as the first and second fireproof sheets. Fire prevention structure at the penetration.