JPH05117658A - Granular refractory filler - Google Patents

Abstract

PURPOSE:To improve filling properties and prevent fire spreading and smoke leakage by mixing a heat-absorbing refractory material which absorbs a large amt. of heat under heating, a thermally expandable refractory material, and a binder, and granulating the resulting mixture. CONSTITUTION:A mixture of a heat-absorbing refractory material which absorbs a large amt. of heat under heating, with a thermally expandable refractory material which expands in volume under heating, an aq. soln. or dispersion contg. a binder, and, if necessary, a shape retention agent and a thickener is granulated and dried to give the title filler having a particle size of 1-25mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to a relatively large building such as a general building, a condominium, a hospital, a department store, a factory, etc. The present invention relates to a granular refractory filling material which is applied to a penetration portion of a building refractory slab that is applied to prevent fire spread and smoke leakage in a space portion of the through hole when performing cable wiring, other wiring, and piping.

[0002]

2. Description of the Related Art Generally, in a large building, in order to prevent the fire from spreading to the entire building in the event of a fire, the building should have several sections of appropriate size when constructing the structure of the building. It has been practiced to partition the area into partitions and provide fireproof slabs such as walls and floors at the boundaries of each area to create a fireproof area. Then, for example, when performing cable wiring through the fireproof slab that constitutes this fireproof section, a through hole is provided at a predesigned position of this fireproof slab, and cable wiring is performed using this through hole. There is. And such through holes are usually formed in a larger size so that they can be used for expansion of cables installed in the facility, etc.If this is left as it is, it will become a through hole when a fire occurs. A fire slab such as a wall or floor is provided by spreading fire from one fire compartment to the other through a gap created between the cable and a combustible material such as rubber or plastic that covers the copper wire of the cable. As a result, the meaning of forming a fireproof compartment is lost.

For this reason, conventionally, when a through hole for a cable facility or the like is formed in a refractory slab such as a wall or floor, the space portion of the through hole is closed with an inorganic fiber or the like after the facility for the cable or the like. A fire spread prevention process is performed to prevent the spread of fire. And as this fire spread prevention treatment, for example,
A holding plate made of asbestos calcium silicate plate that is slightly larger than the opening area of the through hole is divided into two, and a cutout groove is formed at the dividing edge of the divided holding plate, and the divided edges of these divided holding plates are butted against each other. In this case, an opening for accommodating the installed cable is formed by penetrating the through hole, and the holding plate formed in this way is formed on both sides of the through hole with fireproof putty, fireproof seal, etc. Airtightly attached via a material, the space inside the through hole partitioned by the holding plate, that is, the fireproof space, is densely filled with inorganic fibers such as rock wool, and the divided holding plates are butted against each other. The edges and openings of each holding plate through which the cable penetrates are airtightly closed with a fireproof sealant, and a fire that occurs in one of the fire prevention compartments creates a gap between the through hole peripheral wall and the cable and combustible material of the cable. Fire protection of the other through Those so as to prevent the Mokemuri or spread of fire to the field is known.

[0004]

However, in such a conventional fire spread prevention treatment, it is a very troublesome work to densely fill the fireproof space formed in the through hole with the inorganic fiber such as rock wool. is there. Also, if the penetrating object is a cable for telecommunications equipment, etc., and if the fire lasts for a long time, the heat from the fire that occurs on one side of the refractory slab will be transmitted through the copper wire with good thermal conductivity around the cable. The copper wire in the center of the cable becomes even hotter, as the inorganic fibers that have been transmitted to the inside and to the other side of the fireproof slab act as a heat insulating material at this time, and the copper wire at the center of the cable becomes hotter, and on the other side of the fireproof slab. A combustible material such as rubber or plastic that covers the copper wire of the cable may be heated above its ignition point and ignited to spread to the other side of the refractory slab. In addition, when flammable material in the cable burns in the fireproof space, a gap is created between the inorganic fiber filled in the fireproof space and the copper wire of the cable, causing smoke leakage and securing this cable in the fireproof space. There is a risk that the cable that has been cut during the fire may slide downstairs, etc.

Therefore, as a result of intensive studies to solve the conventional problems, the inventors of the present invention can easily and airtightly fill the fireproof space formed in the through hole of the fireproof slab. , A new granular fireproof filler that has excellent workability in fire spread prevention treatment and, at the time of a fire, exhibits excellent fire spread prevention performance and smoke leakage prevention effect. Therefore, the object of the present invention is to improve the workability of the fire spread prevention treatment applied to the through-holes of the building fireproof slab, and moreover, to exert the excellent fire spread prevention performance and smoke leakage prevention effect than ever before. It is to provide a granular refractory filler to be obtained.

[0006]

That is, the present invention is mainly composed of an endothermic refractory material that absorbs a large amount of heat when heated and a thermally expansive refractory material that expands in volume when heated, and these are granulated with a binder. It is a granular refractory filler obtained by granulating in a granular shape. This granular refractory filler is basically a mixture of one or more endothermic refractory materials that absorbs a large amount of heat when heated and decomposes and / or deteriorates itself, and expands in volume when heated. The main material is one or a mixture of two or more types of heat-expandable refractory materials that fills the gaps between the refractory fillers and the gaps between the refractory fillers and cables, and solidifies the refractory fillers together. age,
It is formed by granulating these with a binder.

The endothermic refractory material used in the present invention is specifically borax, aluminum hydroxide, magnesium hydrate,
The heat-expandable refractory material is specifically one or a mixture of two or more selected from hydrated silicate, alum, hydrated calcium silicate, gypsum dihydrate, ettringite, bentonite, and zeolite. Is one or a mixture of two or more selected from borax, vermiculite, hydrous mica, obsidian and pearlite. In addition, borax absorbs a large amount of heat when heated and decomposes to generate water vapor and expands in volume, so if this is used as the main material of this refractory filler, an endothermic refractory material and a thermal expansion refractory material are used. It plays the role of both materials at the same time.

Further, as the binder for binding these refractory materials, for example, synthetic acetic acid emulsion, polyethylene-vinyl acetate emulsion, polyvinyl alcohol, polyacrylic acid emulsion, polymethacrylic acid emulsion, etc. Molecular binder, starch paste, C
Examples thereof include natural polymer binders such as MC, MC, glue, casein and gelatin, and inorganic binders such as water glass and colloidal silica.

The method for producing the granular refractory filler of the present invention is not particularly limited, and a conventionally known method can be adopted. For example, a Henschel mixer or the like is used,
It suffices to add an aqueous solution or water dispersion of a binder to a mixture of a heat-absorbing refractory material and a heat-expandable refractory material, knead, granulate, and dry.

The particle size of the granular refractory filler of the present invention is usually 1 to 25 mm, preferably 2 to 10 mm.
If the particle size of the present refractory filler is less than 1 mm, it may leak from the filling portion of the fireproof structure, and if it is greater than 25 mm, the filling operation becomes difficult and unfilled portions remain. In addition, when granulating into granules by using one or more mixtures of the above endothermic refractory materials, one or more mixtures of thermal expansion refractory materials and a binder, for example, bentonite, etc. The shape retention material of
For example, the workability of the granulating work can be improved by adding a thickener such as MC, CMC or polyethylene glycol.

The granular refractory filler of the present invention is a fireproof space formed in a through hole formed in a refractory slab forming a floor or wall of a building, for example, one side of the through hole is closed by a bottom wall member. Fill a space formed by closing the other side with a lid member, a box-like space formed by the side wall member provided along the peripheral wall of the through hole in addition to the bottom wall member and the lid member, and the like. It completely encloses a penetrating object such as a cable penetrating the through hole, and interrupts between one side and the other side of the refractory slab.

[0012]

The granular refractory filler of the present invention is extremely easily and reliably filled in the fireproof space. Also, for example, in the case of a fireproof structure of the cable penetration part, the cable can be densely covered with the granular fireproof filler over the entire length in the fireproof space, and even if a fire occurs in one fireproof section, the granular fireproof The endothermic refractory material that constitutes the filler absorbs heat and exerts a cooling effect, while the heat-expandable refractory material expands and secures the cable in this fireproof space, so the gap between the cable and the cable itself The combustible material constituting the above, that is, the combustible cable covering material does not spread to the other fire-preventing compartment or cause smoke leakage.

[0013]

EXAMPLES The present invention will be specifically described below based on examples.

Example 1 70 parts by weight of borax (endothermic refractory material, heat-expandable refractory material),
25 parts by weight of aluminum hydroxide (endothermic refractory material), 5 parts by weight of bentonite (endothermic refractory material, shape retention material), and 1.5 parts by weight of polyacrylic acid emulsion (binder) (as solid content) , 0.5 wt% MC (thickener) aqueous solution 1
5 parts by weight was kneaded and granulated into granules having an average particle diameter of 3.5 mm to prepare granular refractory filler A of Example 1.

[Preparation of Specimen] Next, using the granular refractory filler A prepared in Example 1 above, the following specimen was manufactured based on the standards of the Japan Building Center. That is, FIG. 1 and FIG. 2 show a test body related to the penetration fire protection structure of the building fireproof slab manufactured here.
The fireproof structure of this test body includes a plurality of fittings 1 attached to the opening edge of a through-hole 8 formed by vertically penetrating a fireproof slab that constitutes a fireproof section of a building, for example, a floor slab 7. A pair of bottom wall members 2a made of fireproof inorganic fiber molded plate, which are fitted into the through hole 8 while avoiding the cables 9a and 9b penetrating the through hole 8 and are held by the fitting 1 to form the bottom wall of the through hole 8. 2b and the side wall members 3a, 3b made of fireproof inorganic fiber molded plates, which are fitted along the peripheral wall of the through hole 8 and form a fireproof space together with the pair of bottom wall members 2a, 2b.
And a fireproof auxiliary material 4 which is filled in the fireproof space and adjusts the size of the fireproof space to a necessary and sufficient size, and a pair of fireproof inorganic fiber moldings which close the fireproof space by avoiding the cables 9a and 9b. Plate lid members 5a, 5b and cable 9
The bottom wall members 2 and 2a and 2b and the lid members 5a and 5b located around a and 9b, and the fire-resistant seal materials 6a and 6b filling the gaps between the cables 9a and 9b.
a, 2b, the lid members 5a, 5b, and the granular fireproof filler A of Example 1 filled in the fireproof space formed by the fireproof auxiliary material 4. The bottom wall member 2a,
2b, the side wall members 3a and 3b, and the lid members 5a and 5b are all formed of silica as a refractory inorganic fiber molding plate.
Wet-molded ceramic fiber board made by adding polymer binder to alumina fiber [Nippon Steel Chemical Co., Ltd. product name: S-fiber SC1260 board]
Is used as the refractory auxiliary material 4, and a rock wool molded board formed by cutting rock wool molded with a polymer binder into blocks of a predetermined size [trade name of Nippon Steel Chemical Co., Ltd. : Sboard 3150], fireproof putty [Cabseal manufactured by Nippon Steel Chemical Co., Ltd.] is used as the fireproof sealant 6a, and fireproof putty [Nippon Nippon] is used as the fireproof sealant 6b. Trade name: cab seal manufactured by Tetsugaku Co., Ltd. was used.

[Fire Resistance Test] Using the test body thus prepared, a fire resistance test was conducted for 2 hours based on the fire resistance test method of JIS A1304. As a result, no abnormality was observed on the back surface of the test body during and after heating for 2 hours. Further, at this time, the temperature of the fireproof sealant 6b at the back side cable penetrating portion did not exceed 300 ° C., and it was possible to sufficiently satisfy the standard as the fire preventing structure of the penetrating portion.

Example 2 70 parts by weight of borax (endothermic refractory material, heat-expandable refractory material),
30 parts by weight of fluke (heat-expandable refractory material), 7 parts by weight of polyvinyl acetate emulsion (binder) (as solid content),
10 parts by weight of water was kneaded and granulated into granules having an average particle size of 4.5 mm to prepare granular refractory filler A of Example 2.
Also for the granular refractory filler A of this Example 2, similarly to the above-mentioned Example 1, a test body was produced based on the standards of the Japan Building Center, and based on the fire resistance test method of JIS A 1304, 2 A time fire resistance test was conducted. As in the case of Example 1, the results show that no abnormalities were observed on the back surface of the test piece during and after heating for 2 hours, and the temperature of the fire-resistant sealing material 6b at the back-side cable penetration portion was 300 ° C. It was possible to sufficiently satisfy the standard as a fireproof structure for the penetrating section without exceeding the above.

[0018]

INDUSTRIAL APPLICABILITY According to the granular refractory filler of the present invention, the work of filling the fireproof space formed in the through holes of the refractory slab is extremely easy and the workability is significantly improved. Since no calcium silicate plate is used, there is no work environment problem associated with this fire spread prevention work, and the granular fireproof filler filled in the fireproof space has the effect of cooling and preventing the formation of gaps during a fire. It exhibits excellent flame spread prevention performance than ever before.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a fireproof structure of a test body constructed by using a granular fireproof filler according to an example of the present invention.

2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

A ... Granular fireproof filler, 1 ... Mounting bracket, 2a,
2b ... Bottom wall member, 3a, 3b ... Side wall member, 4 ... Fireproof auxiliary material, 5a, 5b ... Lid member, 6a, 6b ... Fireproof sealing material, 7 ... Floor slab (fireproof slab), 8 ... Through hole,
9a, 9b ... Cables.

Claims (3)

[Claims] 1. A granular refractory material comprising, as a main material, an endothermic refractory material that absorbs a large amount of heat during heating and a thermally expansive refractory material that expands in volume during heating, and these are granulated into granules with a binder. Filling material. 2. An endothermic refractory material selected from borax, aluminum hydroxide, hydrated magnesium, hydrated silicic acid, alum, hydrated calcium silicate, gypsum dihydrate, ettringite, bentonite and zeolite. The granules according to claim 1, wherein the heat-expandable refractory material is one or a mixture of two or more selected from borax, vermiculite, hydrous mica, obsidian and pearlite. Fireproof filler. 3. The granular refractory filler according to claim 1, wherein the refractory filler has a particle size in the range of 1 to 25 mm.