JP2783698B2 - Granular refractory filler - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to relatively large buildings such as general buildings, condominiums, hospitals, department stores, factories and the like, and to fireproof walls, floors and the like constituting the buildings. When conducting cable wiring, other wiring, piping, etc. of telecommunications equipment etc. through the slab, in the penetration of the building fireproof slab applied to prevent fire spread and smoke leakage in the space of this through hole The present invention relates to a granular refractory filler to be filled. 2. Description of the Related Art Generally, in a large building, in order to prevent a fire from spreading over the entire building in the event of a fire, the building must be appropriately sized when building a frame of the building. Such sections are partitioned, and a fireproof section is provided by providing a refractory slab such as a wall or a floor at the boundary of each section. And, for example, when performing cable wiring through the refractory slab constituting the fire protection section, a through hole is provided at a pre-designed position of the refractory slab, and cable wiring is performed using the through hole. I have. Such through-holes are usually formed to be large so as to be able to accommodate the expansion of cables to be installed using such through-holes. The fire spreads from one fire compartment to the other via a combustible material such as rubber or plastic that covers the gap between the cable and the copper wire of the cable, and a fire-resistant slab such as a wall or floor is provided. The consequence of losing the meaning of forming a fire compartment is lost. For this reason, conventionally, when a through hole for a cable facility or the like is opened in a refractory slab such as a wall or a floor, a space portion of the through hole is closed with an inorganic fiber or the like after the facility of the cable or the like. A fire spread prevention process is performed to prevent the spread of fire. And as this fire spread prevention processing, for example,
Divide the holding plate made of asbestos calcium silicate plate which is slightly larger than the opening area of the through hole into two, and form a notch groove in the dividing edge of the dividing holding plate, and join the dividing edges of each of these dividing holding plates to each other An opening for accommodating the cable installed through the through hole is formed when the through hole is formed, and the holding plate thus formed is placed on both side edges of the through hole with a fire-resistant seal such as a fire-resistant putty or a fire-resistant seal. The space inside the through hole partitioned by this holding plate, that is, the fire prevention space, is filled tightly with inorganic fibers such as rock wool, and the divided holding plates are abutted against each other. The edges and the openings of each holding plate through which the cable passes are airtightly closed with a fireproof sealant, and the fire that occurred in one of the fire prevention compartments caused the gap between the peripheral wall of the through hole and the cable and the flammable material of the cable. Fire protection through the other 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 process, it is extremely troublesome to densely fill the fire protection space formed in the through hole with inorganic fibers such as rock wool. Work. Also, if the penetrating object is a cable such as a telecommunications facility and the fire lasts for a long time, the heat of the fire generated on one side of the refractory slab will be transmitted through the copper wire with good thermal conductivity at the center of the cable and the fire protection space The inside of the fireproof slab is transmitted to the other side of the fireproof slab, and at this time, the inorganic fiber filled in the fireproof space serves as a heat insulating material, and the copper wire in the center of the cable becomes increasingly hot, and the other side of the fireproof slab A combustible material such as rubber or plastic covering the copper wire of the cable may be heated to a temperature higher than its ignition point and ignite, and spread to the other side of the refractory slab. Furthermore, when the combustible material of the cable burns in the fire protection space, a gap is created between the inorganic fiber filled in the fire protection space and the copper wire of the cable, and smoke leaks from there, or this cable is secured in the fire protection space There is a fear that the function of the cable may be lost and the cable cut at the time of the fire may slide downstairs. The inventors of the present invention have conducted intensive studies in order to solve such a conventional problem, and as a result, they have been able to easily and hermetically fill the fire protection space formed in the through hole of the refractory slab. We have developed a new granular refractory filler which is excellent in workability of the fire spread prevention treatment and can exhibit excellent fire spread prevention performance and smoke leakage prevention effect in case of fire. Accordingly, an object of the present invention is to improve the workability of the fire spread prevention treatment applied to the through-hole of the building refractory slab, and exhibit more excellent fire spread prevention performance and smoke leakage prevention effect than ever before. It is to provide a granular refractory filler obtained. That is, the present invention comprises a heat-absorbing refractory material that absorbs a large amount of heat when heated and a heat-expandable refractory material that expands in volume when heated, and these are joined together. It is a granular refractory filler obtained by granulating with an agent. Basically, the granular refractory filler absorbs a large amount of heat when heated and decomposes and / or degrades itself, or a mixture of two or more refractory materials, and expands in volume when heated. The main material is one or a mixture of two or more thermally expandable refractory materials which fill the gaps between the refractory filler material and the gap between the refractory filler material and the cable and solidify the refractory filler material. age,
These are granulated into granules with a binder. [0007] The endothermic refractory used in the present invention is specifically borax, aluminum hydroxide, bentonite or the like.
And the heat-expandable refractory material is specifically
Is borax. In particular, borax, which is 10 times water of crystallization, and 3
Aluminum hydroxide, which is double crystallization water, hit a flame
At the same time, these are used together as the main material to release water of crystallization.
In this case, a very excellent cooling effect can be exhibited. Borax absorbs a large amount of heat and decomposes when heated, generates water vapor and expands in volume. Therefore, if this is used as the main material of the present refractory filler, it can be used as an endothermic refractory material and a thermal expansion refractory material. It plays both roles of the material at the same time. [0008] Examples of the binder for binding these refractory materials include synthetic high-molecular-weight emulsions such as polyacetic acid emulsion, polyethylene-vinyl acetate emulsion, polyvinyl alcohol, polyacrylic acid emulsion, and polymethacrylic acid emulsion. Molecular binder, starch paste, C
Examples 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 employed. For example, using a Henschel mixer or the like,
An aqueous solution or aqueous dispersion of the binder may be added to a mixture of the endothermic refractory material and the heat-expandable refractory material, kneaded, granulated and dried. The particle size of the granular refractory filler of the present invention is usually in the range of 1 to 25 mm, preferably 2 to 10 mm.
If the particle size of the refractory filler is smaller than 1 mm, it may leak from the filled portion of the fireproof structure. If it is larger than 25 mm, the filling operation becomes difficult and unfilled portions remain. When one or more mixtures of the above-mentioned endothermic refractory materials, one or more mixtures of the heat-expandable refractory materials and a binder are used to granulate into granules, for example, bentonite, etc. May be added, and furthermore,
For example, by adding a thickener such as MC, CMC, or polyethylene glycol, the workability of the granulating operation can be improved. [0011] The granular refractory filler of the present invention provides a fireproof space formed in a through hole formed in a refractory slab constituting a floor or a wall of a building, for example, one side of the through hole is closed by a bottom wall member. Filling a space closed on the other side with a lid member, a box-shaped space formed by a side wall member arranged along the peripheral wall of the through hole in addition to the bottom wall member and the lid member, and the like Used to completely surround a through-hole such as a cable penetrating the through-hole, and to shut off between one side and the other side of the refractory slab. The granular refractory filler of the present invention can be very easily and reliably filled into a fire protection space. Further, for example, in the case of a fire prevention structure of a cable penetration portion, the cable can be covered densely with a granular refractory filler over its entire length in the fire protection space, and even if a fire occurs in one of the fire protection compartments, the granular fire resistance can be prevented. The heat-absorbing refractory material constituting the filler absorbs heat and exhibits a cooling effect.On the other hand, the heat-expandable refractory material expands and secures the cable in this fireproof space. Flammable material, that is, the burning of the flammable cable coating material does not spread to the other fire protection compartment or leak. Hereinafter, the present invention will be described in detail with reference to examples. Example 1 70 parts by weight of borax (endothermic refractory, heat-expandable refractory),
25 parts by weight of aluminum hydroxide (endothermic refractory), 5 parts by weight of bentonite (endothermic refractory, shape-retaining material), 1.5 parts by weight of polyacrylic acid emulsion (binder) (as solid content) 0.5% by weight MC (thickener) aqueous solution 1
5 parts by weight were kneaded and granulated into granules having an average particle size of 3.5 mm to prepare a granular refractory filler A of Example 1. [Preparation of Specimen] Next, using the granular refractory filler A prepared in Example 1 above, the following specimens were produced based on the standards of the Japan Building Center. That is, FIGS. 1 and 2 show a test body relating to the fire protection structure for a penetration portion of the building refractory slab manufactured here.
The fire prevention structure of the test body includes a plurality of mounting brackets 1 attached to an opening edge of a through-hole 8 formed by vertically penetrating a fire-resistant slab, for example, a floor slab 7 constituting a fire protection section of a building. A pair of bottom wall members 2a made of a refractory inorganic fiber molded plate, which are fitted into the through holes 8 avoiding the cables 9a and 9b penetrating the through holes 8 and are held by the mounting bracket 1 to form the bottom wall of the through holes 8. , 2b and four side walls 3a, 3b made of a refractory inorganic fiber molded plate, which are fitted along the peripheral wall of the through hole 8 and form a fire protection space together with the pair of bottom wall members 2a, 2b.
And a fire-resistant auxiliary material 4 which is filled in the fire protection space and adjusts the size of the fire protection space to a necessary and sufficient size, and a pair of fire-resistant inorganic fiber moldings for closing the fire protection space avoiding the cables 9a and 9b. Plate lid members 5a and 5b and cable 9
a, fire-resistant sealing materials 6a, 6b which fill gaps between the cables 9a, 9b and the bottom wall members 2a, 2b and the cover members 5a, 5b located around the bottom wall member 2;
a, 2b, the lid members 5a, 5b, and the granular refractory filler A of Example 1 filled in the fire protection space formed by the refractory auxiliary material 4. The bottom wall member 2a,
2b, side wall members 3a and 3b, and lid members 5a and 5b, all of which are made of silica or
A ceramic fiber board obtained by adding a polymer binder to alumina fibers and wet-molding [Nippon Steel Chemical Co., Ltd. product name: S-fiber SC1260 board]
Rock wool molded board formed by cutting rock wool with a polymer binder and cutting it into a block of a predetermined size [trade name of Nippon Steel Chemical Co., Ltd.] : S-Board 3150], and a fire-resistant putty (trade name: Cab Seal, manufactured by Nippon Steel Chemical Co., Ltd.) is used as the fire-resistant seal material 6a. (Trade name: Cabseal manufactured by Tekko Chemical Co., Ltd.) was used. [Fire Resistance Test] The test specimen prepared in this manner was subjected to a fire resistance test for 2 hours according to the fire resistance test method of JIS A1304. As a result, no abnormality was observed on the back surface of the test piece during and after heating for 2 hours. At this time, the temperature of the fireproof sealing material 6b at the rear cable penetrating portion did not exceed 300 ° C., and the standard for the fireproof structure at the section penetrating portion was sufficiently satisfied. Example 2 70 parts by weight of borax (endothermic refractory, heat-expandable refractory),
Vermiculite (heat-expandable refractory) 30 parts by weight, polyvinyl acetate emulsion (binder) 7 parts by weight (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 a granular refractory filler A of Example 2.
As for the granular refractory filler A of Example 2, a test piece was produced in accordance with the standards of the Japan Building Center in the same manner as in Example 1 described above, and a test piece was prepared based on the fire resistance test method of JIS A 1304. A time fire test was performed. As a result, as in the case of Example 1 above, no abnormality was observed on the back surface of the test piece during and after heating for 2 hours, and the temperature of the fireproof seal material 6b at the back side cable penetration portion was 300 ° C. And the criteria for the fire prevention structure of the section penetration portion could be sufficiently satisfied. According to the granular refractory filler of the present invention, the work of filling the inside of the fire protection space formed in the through hole of the refractory slab is extremely easy, and the workability is remarkably improved. In addition, the use of calcium asbestos silicate plates does not require any work environment problems associated with the work to prevent the spread of fire, and the granular refractory filler filled in the fire protection space prevents the cooling effect and the formation of gaps in the event of a fire It exhibits the effect of preventing the spread of fire more than before.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional explanatory view showing a fire prevention structure of a test body constituted by using a granular refractory filler according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II of FIG. [Description of Signs] A: Granular refractory filler, 1: Mounting bracket, 2a,
2b: bottom wall member, 3a, 3b: side wall member, 4: fire-resistant auxiliary material, 5a, 5b: lid member, 6a, 6b: fire-resistant seal material, 7: floor slab (fire-resistant slab), 8: through hole,
9a, 9b ... cables.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C09K 21/00-21/14 C04B 28/26 C08K 9/08

Claims (1)

(57) [Claims] Borax, an endothermic refractory and a thermal expansion refractory,
The main component is aluminum hydroxide, which is a refractory material,
In addition, a polyacrylic acid-based emulsion as a binder,
Combine the shape-retaining material and the thickener and granulate them into granules.
Refractory slab through cable
Filling material. 2. Check that the particle size of the refractory filler is in the range of 1 to 25 mm.
The granules for preventing fire spread of a fire-resistant slab penetrating cable according to claim 1.
Refractory filler.