JPH084952A - Fireproof structure of through part of refractory slab for building and construction thereof - Google Patents

Abstract

PURPOSE:To provide a fire proof structure of a refractory slab for a building and its construction thereof where the excellent fire spreading preventing performance and the smoke leaking preventing performance are kept, the slab is more lightweight than the conventional one, and the workability of the execution is also improved. CONSTITUTION:A fire proof space whose upper part is open is formed of the metallic mesh frame material at a through hole 2 opened in a refractory slab 1 of a building, and a fire proof space to be communicated with the upper part of this fire proof space with the metallic frame material 4 is formed, and the heat absorbing and thermally expanding particle-shaped refractory filling material is filled in these fire proof spaces to constitute the fire proof structure of the piercing part. This structure is mainly executed in the process where the metallic mesh frame material 3 is inserted in the through hole 2, and the metallic frame material 3 is fixed to the upper surface of the refractory slab 1, and the particle-shaped refractory filling material 5 is closely filled in the respective fire proof spaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present 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 penetration fire prevention structure for a building fireproof slab and a method of construction thereof, which is applied to prevent fire spread and smoke leakage in the space of the penetration hole when performing cable wiring, other wiring, piping, and the like.

[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 be divided into several sections of appropriate size by fireproof slabs such as walls and floors. The building structure is divided into fireproof compartments. 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.

[0003] Such a through hole is usually formed in a large size so that it can be used for expansion of a cable installed in a facility, and if the through hole is left as it is, the through hole will be formed when a fire occurs. And the cable and the copper wire of the cable is covered with flammable materials such as rubber or plastic to spread the fire from one fire compartment to the other fire compartment and provide a fireproof slab such as a wall or floor. As a result, the meaning of forming a fireproof compartment is lost.

Therefore, conventionally, when a through hole for a cable facility is opened in a fireproof slab such as a wall or floor,
After facilities such as cables, the space of this through hole is covered with, for example, inorganic fibers, concrete, mortar, etc. to prevent the spread of fire to prevent the spread of fire.

The applicant of the present invention can also improve the workability of such a fire spread prevention treatment and, at the same time, can provide a better fire spread prevention performance and smoke leakage prevention effect to the fire protection of the penetration part of the building fireproof slab. A structure has been proposed (Japanese Unexamined Patent Publication No. 138921 and Japanese Unexamined Patent Publication No. 4-19477).

[0006]

DISCLOSURE OF THE INVENTION An object of the present invention is to construct a building which is lighter than before and has improved workability while maintaining excellent fire spread prevention performance and smoke leakage prevention performance. It is intended to provide a fireproof structure for a penetration portion of a refractory slab and a construction method thereof.

[0007]

That is, in the fireproof structure for the penetration portion of the building refractory slab of the present invention, a fireproof space having an upper portion opened with a net-like metal frame material is formed in a through hole formed in the fireproof slab of the building. In addition, a fireproof space communicating with a metal form material is formed above this fireproof space, and both endothermic and thermally expandable granular fireproof fillers are filled in the fireproof space. is there.

Further, in the penetration fire prevention structure of the present invention, in the above technical means, the inorganic fiber closing member is laid on the bottom formed at the lower part of the reticulated metal frame material, and at the same time, the endothermic and thermal expansion properties are provided. The present invention is characterized in that an upper opening of a metal mold material filled with a granular refractory filler is covered with an inorganic fiber closing member.

Further, the penetration fire prevention method for a building fire-resistant slab of the present invention is a construction method for constructing a penetration fire prevention structure in a penetration hole which is opened in a fire-resistant slab of a building and through which a cable penetrates. (A) A step of cutting the inorganic fiber occluding member into a predetermined shape and laying it so as to cover the entire bottom bottom of the reticulated metal frame material, and (b) the reticulated metal frame material penetrating the through hole. After winding around the cable, pushing down along the cable to insert it into the through hole, (c) Spread the reticulated metal frame material to fill the inside of the through hole, and penetrate the brim formed on the upper part of the frame material. A step of locking the outer peripheral edge of the hole to the upper surface of the refractory slab and closely contacting the lower bottom portion of the frame material while spreading the inorganic fiber closing member, (d) turning the metal form material around the cable on the upper surface of the refractory slab, network After joining the ends of the metal form material at a position that completely surrounds the upper brim of the metal form material, the brim-shaped stopper formed at the bottom of the metal form material is fixed to the upper surface of the refractory slab. Step (e) In the fireproof space formed by the reticulated metal frame material and the metal mold material, the endothermic and thermally expandable granular fireproof filler is densely filled up to the upper part of the metal mold material. Step (f) covering the upper part of the metal mold material with an inorganic fiber closing member,
(G) A step of filling the joint between the cable and the inorganic fiber blocking member with a heat-resistant sealing material.

Such technical means will be described with reference to FIG. FIG. 1 shows an example of a penetration fire prevention structure according to the present invention. In the figure, 1 is a refractory slab that constitutes a floor, wall, ceiling or foundation of a building, and 2 is a refractory slab 1 provided in a predetermined shape. Through holes, 3 is a net-shaped metal frame material,
Reference numeral 4 is a metal form material, 5 is an endothermic / expandable granular fireproof filler, 6 and 7 are inorganic fiber closing members, 8 is a heat-resistant sealing material, and 9 is a penetrating object such as a cable.

Each of the fireproof spaces formed by the reticulated metal frame material 3 and the metal form material 4 is a space formed so as to communicate with the inside of the through hole 2 and above the through hole 2, and has a granular fire resistance. When the filling material 5 is filled, the refractory filling material completely surrounds the penetrating object 9 such as a cable penetrating the through hole 2 and can block between one side and the other side of the refractory slab 1. However, it is not particularly limited.

As the reticulated metal frame material 3 for forming the fireproof space, a wire mesh having a predetermined mesh can be used, and a material having a property of easily deforming is preferably used. The reticulated metal frame material 3 has a size (area) that covers at least the entire inner peripheral wall of the through hole 2,
Moreover, the bottom part is provided at the lower part thereof so as to close the lower opening part of the through hole, and the whole reticulated metal frame material is locked on the upper surface of the refractory slab 1 which is the outer edge of the through hole 2 at the upper part thereof. It is preferable that it is provided with a brim portion as described above.

Further, as the metal form material 4 forming the fireproof space, if a fireproof space of a predetermined size can be formed above the fireproof space formed by the reticulated metal frame material 3, it can be formed. There is no particular limitation, and a metal plate such as iron or steel can be used. This metal mold material 4 is in the form of a cylinder that is open at the top and bottom, and has a brim-shaped stopper that can fix the mold material at a predetermined position on the upper surface of the refractory slab 1 at the bottom thereof. Is preferred. Further, the metallic mold material 4 is separable or separable by a separating portion or a dividing portion formed by cutting along the axial direction of the tubular form. In this case, as a method of joining the metal mold material 4, a known method can be appropriately adopted and is not particularly limited, but for example, one end of the mold material to be the separation part or the dividing part is used. A so-called button punch system, in which a convex fitting portion is provided and a bending fitting portion to which the convex portion is fitted at the other end portion is provided, and the convex portion is fitted into the bending fitting portion so as to be integrated, a so-called button punching method or a separating portion thereof. The coupling claws project from one end of the mold material that will be the split parts and the other end is provided with a plurality of coupling grooves into which the coupling claws are inserted and locked, and the coupling claws are coupled at predetermined positions. It is possible to apply a method of integrally connecting by inserting it into the groove.

Both the inorganic fiber closing member 6 laid on the lower bottom of the reticulated metal frame material 3 and the inorganic fiber closing member 7 to be put on the upper opening of the metal form material 4 are lightweight and have fire resistance and From the viewpoint of excellent workability, a fire-resistant inorganic fiber molded plate obtained by molding a fire-resistant inorganic fiber such as silica / alumina fiber, silica fiber, or alumina fiber into a plate shape is preferably used. In particular, the gap generated between the inorganic fiber closing member 7 that covers the upper opening of the metal mold material 4 and the penetrating object 9 such as a cable is
It is preferable to fill with the fireproof sealant 8, and as the fireproof sealant in that case, a conventionally known one such as a fireproof caulking material or a fireproof putty can be used.

Endothermic / thermally expandable granular refractory filler (hereinafter referred to as the present refractory filler) 5 filled in the fireproof space.
Is basically an endothermic refractory material that absorbs a large amount of heat at the time of heating and decomposes and / or deteriorates itself in order to secure the fireproof performance of the penetration fire protection structure filled with the present fireproof filler. Thermal expansion of one or two or more kinds of mixture, filling the gap between the refractory filling materials and the gap between the refractory filling material and the cable by heating and expanding the volume when heating. The main material is one or a mixture of two or more refractory materials, and these are granulated with a binder into granules.

The endothermic refractory material used as a constituent material of the present refractory filler 5 is, for example, borax, aluminum hydroxide, magnesium hydrate, hydrated silicic acid, alum, hydrated calcium silicate, dihydrate. Examples thereof include gypsum, ettringite, bentonite, and zeolite. Examples of the heat-expandable refractory material include 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 expand in volume, so when it is used as the main material of this refractory filler, it is an endothermic refractory material and thermal expansion refractory material. It plays the role of both materials at the same time.

As the binder for binding these refractory materials, for example, synthetic acetic acid emulsion, polyethylene-vinyl acetate emulsion, polyvinyl alcohol, polyacrylic acid type emulsion, polymethacrylic acid type emulsion and the like can be used. 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 particle size of the refractory filler 5 is usually 1 to 25 m.
m, preferably 2 to 10 mm. If the particle size of the present refractory filler is smaller than 1 mm, it may leak from the filling portion of the fireproof structure, and if it is larger than 25 mm, the filling operation becomes difficult and there is a problem that unfilled portions remain.

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, a shape-retaining material such as bentonite may be added, and further, by adding a thickening agent such as MC, CMC, polyethylene glycol or the like, workability of granulation work can be improved.

The present fire protection structure for a penetrating portion is generally applied to the penetrating portion 2 through which a penetrating object 9 such as a cable is penetrated, but similarly for a through hole 2 without the penetrating object 9. It is applicable.

The procedure for constructing the present fire protection structure for a through-hole in a predetermined through-hole is not particularly limited, but it is preferable to adopt each step of the above-mentioned construction method.

In the above construction method, the reticulated metal frame material 3
The inorganic fiber closing member 6 to be laid on the bottom of the lower part is cut and processed into a predetermined shape such as a disk shape, and then spread so as to cover the entire bottom surface thereof (step a). Then, when the closing member 6 made of the inorganic fiber is brought into close contact with the lower bottom portion of the reticulated metal frame material 3 (step c), the closing member 6 can be brought into close contact by being spread with a protruding rod or the like.

Further, in step d of the above-mentioned construction method, when the ends of the metal form material 4 are joined together at the position surrounding the upper brim of the reticulated metal frame material 3, a joining claw and a joining groove are used. When the method is applied, the coupling claws provided at the ends of the mold material, which are to be the separating portions or the dividing portions, and the coupling grooves are inserted, and the coupling claws are bent to couple them. Further, when fixing the brim-shaped stopper formed at a predetermined position under the metal mold material 4 to the upper surface of the refractory slab, it can be fixed using concrete nails, an adhesive or the like.

Further, in step e of the above-mentioned construction method, when the fireproof filler 5 is filled in the fireproof space, the granular filler can be densely filled in the fireproof space by using a projecting rod or the like. .

[0025]

The function of the fire prevention structure for the penetration portion of the building refractory slab of the present invention is as follows.
A fireproof space is formed by a net-shaped metal frame material in the through holes formed in the fireproof slab, and a fireproof space communicating with the metal formwork material is formed above the fireproof space, and heat is absorbed in both fireproof spaces. Since it is filled with a heat-resistant and heat-expandable granular refractory filler, the application of the reticulated metal frame material and granular refractory filler makes it extremely lightweight overall,
Therefore, the weight burden on the refractory slab can be reduced.

Further, since the endothermic / thermally expandable granular refractory filler is used, the filling of the filler into the two-tier fireproof space is extremely easy and reliable. Also, for example, in the case of a fireproof structure of the cable penetration part, the cable can be densely covered with the fireproof filler over its entire length in the fireproof space, and even if a fire occurs in one fireproof section, the fireproof filler The heat-absorbing refractory material that composes heat absorbs heat and exerts a cooling effect, while the heat-expandable fire-resistant material expands and secures the cable in this fireproof space, so the gap between the cable and the cable itself is configured. There is no possibility that the combustible material that is burned, that is, the combustible cable sheathing material, will spread to the other fire-preventing compartment or leak.

Furthermore, the penetration fire prevention method of the present invention is easy to handle because the members constituting the fire prevention structure are not heavy, and there is no need to use special tools or techniques in the construction work. It has very good properties.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. FIG. 2 shows a fire protection structure for a penetration portion of a building refractory slab according to an embodiment of the present invention.

This penetration part fire prevention structure penetrates the penetration hole 20 into a penetration hole 20 formed in a substantially circular shape by vertically penetrating a floor slab 10 as a fireproof slab which constitutes a fire protection section of a building. The receiving wire net 30 as a net-like metal frame material that is fitted into the through hole peripheral wall to avoid the cable 90 having the three-row structure, and the metal formwork fixed to the upper surface of the floor slab 10 that is the outer edge of the through hole 20. Steel form 40 as material
And a ceramic fiber blanket 60 as an inorganic fiber closing member laid on the bottom 31 of the lower portion of the receiving net 30, and a rock wool board 70 as an inorganic fiber closing member that covers the upper opening of the steel form 40.
A fireproof sealant 80 for sealing the gap between the rock wool board 70 and the cable 90, a fire netting space formed by the receiving mesh 30, the steel form 40, the ceramic fiber blanket 60 as a closing member, and the rock wool board 70. Granular fireproof filler 50 filled in
It consists of and.

In this embodiment, as shown in FIGS. 2 and 3, the receiving net 30 has a substantially cylindrical main body shape in which a part thereof is vertically separated to allow contact / separation and the upper side is open. Further, it is formed into a shape having a bottom portion 31 bent inward at its lower portion, and a flange portion 32 bent outwardly at its upper portion and engaged with the outer edge of the through hole 20.

Further, the steel form 40, as shown in FIGS. 2 and 6, is of a separation type made of a strip-shaped steel plate,
It has a flange-shaped stopper 41 that is bent outward and protrudes at a predetermined position on the lower portion thereof, and has end portions 40a, 4a to be joined.
0b has a shape in which a convex portion 42 and a bent fitting portion 43 are provided as a button punch coupling method. The convex portion 42 is formed so as to protrude inward by, for example, embossing.

As the ceramic fiber blanket 60, a ceramic fiber board obtained by adding a polymer binder to silica / alumina fiber and wet-molding (trade name: S-fiber SC1 manufactured by Nippon Steel Chemical Co., Ltd.)
260 board) is used. Further, as the rock wool board 70, a rock wool molding board (trade name of Nippon Steel Chemical Co., Ltd.) formed by cutting rock wool molded with a polymer binder into blocks of a predetermined size is formed. Sboard 3150) is used. All of these are cut into a shape having a predetermined through hole or notch so as to finally penetrate the cable 90. In this embodiment, however, the cable 90 penetrates the ceramic bunquet 60 in the central portion. The rock wool board 70 is cut into a pair of semicircular shapes as shown in FIG. Notches 71a and 70b are formed in the pair of rock wool boards 70a and 70b so that a gap is formed for the cable 90 to penetrate when they are abutted against each other.

As the fireproof seal material 80, fireproof putty (trade name: cab seal manufactured by Nippon Steel Chemical Co., Ltd.) is used. Use this fireproof putty on the rock wool board 7 above.
No. 0 and the cable 90 are applied in the form as shown in the figure, whereby the fireproof space is hermetically sealed.

The main refractory filler 50 filled in the fireproof space is composed of 70 parts by weight of borax (a heat-absorbing refractory material and a heat-expanding refractory material), 25 parts by weight of aluminum hydroxide (a heat-absorbing refractory material), Bentonite (endothermic refractory material, shape retention material) 5 parts by weight, polyacrylic acid emulsion (binder) 1.5 parts by weight (as solid content), 0.5% by weight MC (thickener)
This is kneaded with 15 parts by weight of an aqueous solution and granulated into granules having an average particle diameter of 3.5 mm.

Next, the procedure for constructing the penetration fire prevention structure of this embodiment having such a configuration will be described.

First, as shown in FIG. 3, a bottom portion 31 which is bent inward at the lower portion of the receiving wire net 30 is cut into a donut disk shape having an outer diameter close to the inner diameter of the through hole, and then the cable is placed at one position thereof. Ceramic fiber blanket 6 with a slit for passing 90 through the hole in the center
Spread 0 (above, process a).

Next, as shown in FIG. 4, the receiving wire net 30 having the ceramic fiber blanket 60 spread thereon is applied to the cable 90 passing through the through hole 20 of the floor slab 10, and then in the direction of arrow p in the figure. Wrap it by deforming it so that it clings to it. After that, the receiving wire net 30 in the wound state is pushed down in the direction of the arrow q in the drawing along the cable 90, and inserted into the through hole 20 (above, step b).

Next, the receiving wire net 30 inserted into the through hole 20 is spread over the inside of the through hole 20 and brought into close contact with the inner peripheral wall of the through hole. Then, the plurality of flange portions 32 bent outside of the upper portion of the receiving wire net 30 are sufficiently locked to the upper surface of the floor slab 10 which is the outer edge of the through hole 20, and at the same time, the lower bottom portion 31 of the receiving wire net 30. On the other hand, the ceramic fiber blanket 60 is brought into close contact while being spread by using a stick or the like (above, step c). As a result, since the receiving wire net 30 is installed in the through hole 20,
A fireproof space is formed in the through hole 20 by the receiving wire net 30.

Subsequently, as shown in FIG. 6, the floor slab 10 is
The steel form 40 is rotated around the cable 90 on the upper surface side, and is deformed in the direction of arrow r in the figure in order to join the ends 40a and 40b. Then, as shown in FIG. 7, at a position that completely surrounds the collar portion 32 at the upper part of the receiving net 30, the convex portion 42 provided at the end portion 40a of the steel mold 40 is provided at the other end portion 40b. The ends 40a and 40b of the steel mold 40 are joined by being inserted and fitted into the bending fitting portion 43. This allows
The steel form 40 has an annular shape with upper and lower openings, and its outer circumference is set. After that, concrete nails 42 are driven into a brim-shaped stopper 41 that is bent to the outside of the lower portion of the steel form 40, and the entire steel form 40 is fixed to the floor slab 10.
It is fixed to the upper surface of the (step d). Thereby, the fireproof space by the steel form 40 is formed in a state of communicating with the above-mentioned fireproof space. The brim-shaped stopper 41 may be fixed to the upper surface of the floor slab 10 by using a vinyl acetate resin adhesive for concrete instead of the concrete nail 42. Further, the position where the brim-shaped stopper 41 is provided is not limited to the illustrated mode, and can be appropriately changed and set according to installation conditions and the like.

Next, the above-mentioned receiving net 30 and the steel form 4
As shown in FIG. 8, the fireproof space mainly formed by 0 and 0 is filled with the granular fireproof filler 50 while hitting it with a projecting rod or the like to a predetermined height above the steel form 40. Fill (above, step e).

After the predetermined amount of the refractory filling material 50 is filled, as shown in FIGS. 8 and 2, a pair of rock wool boards 70a and 70b are butted against the upper portion of the steel mold 40 ( Above, step f). At this time, a notch 7 is formed in the center of the butted rock wool board 70.
A hole composed of 1a and 70b is formed, and the cable 90 penetrates through this hole.

Finally, the gap between the cable 90 and the rock wool board 70 is taped up with a heat-resistant putty and applied to fill the joint with the heat-resistant sealing material 80 (above, step g). Through the above work, the through hole 20 of the floor slab 10
In this case, a penetration fire prevention structure as shown in FIG. 2 is constructed.

Next, the following fire resistance test was conducted on the fire protection structure of the through portion of this example. That is, the test body of the above-mentioned example was manufactured based on the standard of Japan Building Center. At this time, about 1.8 liters of the refractory filler 50 was used. The test piece thus produced was subjected to a fire resistance test for 2 hours based on the fire resistance test method of JIS A 1304. As a result, no abnormality was found on the back surface of the test piece during and after heating for 2 hours. There wasn't.
At this time, the temperature of the fireproof sealant 90 in the back side cable penetrating portion did not exceed 300 ° C., and could sufficiently satisfy the criteria as the fire preventing structure of the compartment penetrating portion.

According to the present inventors, in order to exert such excellent fire resistance, 4 kg of mortar and 1 kg of water must be usually used in the conventional fireproof structure using mortar as the filler. However, it was confirmed that this fireproof structure requires only 2 kg of the above-mentioned refractory filler 50. It was also confirmed that the use of a reticulated metal material as a frame material for forming a fireproof space in the through hole is effective for weight reduction.

Although the above-mentioned embodiments have described the case where the above-mentioned refractory filler A is used as the present refractory filler, the present refractory filler A is also used in the present invention, for example, borax (an endothermic refractory material, 70 parts by weight of heat-expandable refractory material, 30 parts by weight of vermiculite (heat-expansion refractory material), 7 parts by weight of polyvinyl acetate emulsion (binder) (as solid content), and 10 parts by weight of water The endothermic refractory material, the heat-expandable refractory material, the binder and the other additives may be granulated into granules having an average particle diameter of 4.5 mm, and the types and blending ratios thereof may be appropriately changed before use.

[0046]

EFFECTS OF THE INVENTION According to the penetration fire prevention structure of the building fireproof slab of the present invention, excellent fire spread prevention performance and smoke leakage prevention performance can be obtained, and the construction work is lighter than before. The property is remarkably improved. Particularly, since it is extremely lightweight, it is possible to reduce the weight burden on the refractory slab.

Further, since the reticulated metal frame material is used as the frame material forming the fireproof space in the through hole,
Not only can the weight be reduced, but the applicability when installing in various through holes is improved. Furthermore, the fireproof space was made to project from the surface of the fireproof slab with a metal form material (In other words, the fireproof space was made thicker than the thickness of the fireproof slab. By this, it is possible to provide a fireproof structure that is tougher and has excellent fire resistance and fire spread prevention effects. Moreover, by making the metal mold material separable or separable, it is possible to form a fireproof space of various sizes and shapes on the fireproof slab.

Further, according to the penetration part fire prevention method of the present invention,
The fireproof structure having excellent performance as described above can be constructed very simply and quickly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view for explaining the basic configuration of a penetration fire prevention structure of a building fireproof slab of the present invention.

FIG. 2 is a partially cutaway perspective view showing a penetration part fire prevention structure of a building fireproof slab according to an embodiment of the present invention.

FIG. 3 is a perspective view showing one step (step a) in the penetration fire prevention method of the embodiment.

FIG. 4 is a perspective view showing one step (step b) in the penetration fire prevention method of the embodiment.

FIG. 5 is a perspective view showing one step (step c) in the penetration part fire protection method of the embodiment.

FIG. 6 is a perspective view showing one step (first half of step d) in the penetration fire prevention method of the example.

FIG. 7 is a perspective view showing one step (the latter half of step d) in the penetration fire prevention method of the embodiment.

FIG. 8 is a perspective view showing one step (steps d and e) in the penetration portion fire protection method of the embodiment.

[Explanation of symbols]

1 (10) ... Fire-resistant slab, 2 ... Through hole, 3 ... Reticulated metal frame material, 4 ... Metal form material, 5 ... Main refractory filler, 6,
7 ... Inorganic fiber blocking member, 8 ... Fireproof sealing material, 9 ... Cable and other penetrating objects

Claims (3)

[Claims] 1. A fireproof space having an opening at the top thereof formed of a net-shaped metal frame material in a through hole formed in a fireproof slab of a building, and a fireproof space communicating with the metal formwork material above the fireproof space. A fireproof structure for the penetration of a building fireproof slab, characterized in that both of these fireproof spaces are filled with a heat-absorbing and heat-expanding granular fireproof filler. 2. The fireproof structure according to claim 1, wherein an inorganic fiber occluding member is laid on the bottom formed in the lower portion of the reticulated metal frame material, and the endothermic / thermally expandable granular fireproof filler is provided. A fireproof structure for a penetration portion of a building fireproof slab, characterized in that an upper opening portion of a filled metal form material is covered with an inorganic fiber closing member. 3. A method for constructing a through-hole fireproof structure in a through-hole that is opened in a fireproof slab of a building and through which a cable penetrates, and comprises the following steps: (a) forming an inorganic fiber blocking member into a predetermined shape. Cutting and laying so as to cover the entire bottom bottom of the reticulated metal frame material, (b) winding the reticulated metal frame material around the cable passing through the through hole, and then pushing down along the cable. Step of inserting into the through hole, (c) Spreading the reticulated metal frame material to fill the inside of the through hole, and locking the brim portion formed on the upper portion of the frame material to the upper surface of the fireproof slab at the outer edge of the through hole and the frame. Step of pushing the inorganic fiber closing member while spreading it to the lower bottom of the material, (d) turning the metal form material around the cable on the upper side of the refractory slab to completely surround the upper brim of the reticulated metal frame material In position A step of fixing the brim-shaped stopper formed at the bottom of the metal form material to the upper surface of the refractory slab after joining the ends of the metal form material, (e) the reticulated metal frame material and the metal form In the fireproof space formed with the frame material, a step of densely filling the upper end of the metal mold material with the endothermic / thermally expandable granular refractory filler, (f) inorganic material on the upper part of the metal mold material The step of covering the fiber blocking member,
(G) A process of filling a gap between the cable and the inorganic fiber closing member with a heat-resistant sealing material in a joint, and a fire protection method for a penetration portion of a building refractory slab.