JP6922011B2 - Fireproof structure of beam - Google Patents

Description

The present invention relates to a fireproof structure of a beam, particularly a fireproof structure of a beam provided with a through hole.

In order to secure a usable space in a steel-framed building, it is unavoidable to attach air-conditioning and sanitary piping such as air-conditioning ducts (sleeve) and ventilation ducts (sleeve) to steel beams, and / or electricity. It may penetrate wiring such as cables. In such a case, it is necessary to provide a through hole in the steel beam in advance and insert the duct or the like through the through hole.

In this case, in order to protect the steel beam from the high temperature generated in the event of a fire or the like and to ensure the fire resistance performance, it is desirable to cover the steel beam with a fire resistant coating material such as rock wool to a specified thickness.

On the other hand, when a cable or the like is passed through a steel beam, if the cable or the like is passed through the steel beam after the fireproof coating is applied, the fireproof coating or the cable or the like will be damaged. A metal sleeve pipe is attached to the sleeve pipe in advance, and a cable or the like is installed in the sleeve pipe in a penetrating state to spray a fireproof coating material.

Examples of such a sleeve include the through sleeve for steel frame fireproof coating described in Patent Document 1, but such a conventional sleeve is costly and laborious to construct. In addition, there was a risk of fire spreading from the gap between the through hole and the sleeve.

JP 2006-200165

An object of the present invention is to provide a fireproof structure of a beam having improved fireproof performance with a simple configuration.

In order to achieve the above object, the present inventors, in particular, straddle a penetrating material made of a heat-expandable refractory sheet between a surface forming a through hole in a beam and a nonflammable material constituting the sleeve. It was found that the above-mentioned problems could be solved by arranging the above-mentioned problems, and the present invention was completed.

That is, the present invention is as follows.
[1] A fireproof structure of a beam provided with a through hole.
A non-combustible material is placed on the surface that partitions the through hole in the beam.
A fireproof structure of a beam, characterized in that a penetration treatment material is arranged on the beam and the nonflammable material.
[2] Piping or wiring is inserted through the through hole,
Item 2. The fireproof structure of a beam according to Item 1, wherein the penetration treatment material is further arranged on the pipe or wiring and the nonflammable material.
[3] The fireproof structure of a beam according to Item 1 or 2, wherein the nonflammable material is made of a metal sleeve or a heat-expandable fireproof sheet.
[4] The fireproof structure of a beam according to any one of Items 1 to 3, wherein the penetration treatment material is made of a heat-expandable fireproof sheet.

According to the present invention, since the penetrating material is continuously arranged on the beam and the non-combustible material provided in the through hole of the beam, fire resistance is ensured and the gap is easily and surely closed. , It is possible to prevent the spread of fire due to fire.

It is a partial schematic perspective view which illustrates the steel beam provided on the floor. It is a partial schematic cross-sectional view for demonstrating the process of providing a heat-expandable refractory sheet in a through hole provided in a steel frame beam. It is a partial schematic perspective view for exemplifying the method of providing the heat-expandable refractory sheet on the inner surface of a through hole. It is a partial schematic cross-sectional view for exemplifying the method of extending the heat-expandable refractory sheet from the through hole to the outside of both of the steel frame beams. It is a partial schematic cross-sectional view which illustrates the state which inserted the duct into a through hole. It is a partial schematic cross-sectional view which illustrates the state which provided the refractory covering material on the steel frame beam. (A) (b) It is a partial schematic cross-sectional view which shows another example of the fire-resistant structure of a steel frame beam. It is a partial schematic cross-sectional view which shows another example of the fire-resistant structure of the steel frame beam (a)-(c).

Hereinafter, the first embodiment of the fireproof structure of the steel beam of the present invention will be described with reference to FIGS. 1 to 6.

In FIG. 1, a steel beam 1 made of H-shaped steel or the like is provided on the lower surface of a floor 3 made of a concrete slab or the like formed by placing concrete. The steel beam 1 is provided with a through hole 2 having a substantially circular cross section, and the inner peripheral surface 8 of the floor 3 partitions the through hole 2. Piping such as an air conditioning duct or a ventilation duct, and / or wiring, a sleeve such as a piping sleeve, or the like can be inserted into the through hole 2.

The shape of the through hole 2 is not limited to a substantially circular cross section, and can be appropriately selected according to the cross-sectional shape of the pipe and / or the wiring to be inserted into the through hole 2. For example, if the cross-sectional shape of the pipe and / or the wiring is circular, the shape of the through hole 2 can be circular, and if the cross-sectional shape of the pipe and / or the wiring is rectangular or the like, the through hole 2 can be formed. The shape of can be a rectangle or the like.

As shown in FIG. 2, a heat-expandable refractory sheet 4 as a non-combustible material is provided on the inner peripheral surface 8 for partitioning the through hole 2.

As illustrated in FIG. 3, the heat-expandable fireproof sheet 4 can be provided on the entire surface of the inner surface 8 of the through hole 2, or can be provided on a part of the inner surface 8 of the through hole 2 (non-). Although shown in the figure), it is preferable to provide the heat-expandable fire-resistant sheet 4 on the entire inner surface 8 of the through hole 2 from the viewpoint of fire resistance in the event of a fire and the installation of a fire-resistant coating material described later. The heat-expandable refractory sheet 4 is rolled up and inserted into the inner surface of the through hole 2. One surface of the heat-expandable refractory sheet 4 imparts adhesiveness, and the adhesiveness may be used to attach the heat-expandable refractory sheet 4 to the inner surface 8 of the through hole 2, or the through hole 2 may be attached using an adhesive or the like. It may be attached to the inner surface 8 of the.

As shown in FIG. 4, the heat-expandable refractory sheet 4 is preferably provided so as to extend from the through hole 2 to the outside of both of the steel frame beams 1. The extension width of the heat-expandable refractory sheet 4 to the outside is 10 to 10 based on the distance between the alternate long and short dash line aa and the alternate long and short dash line bb shown in the steel frame beam 1 of FIG.
The range of 100 mm is preferable, the range of 15 to 65 mm is more preferable, and the range of 20 to 30 mm is further preferable. The same applies to the outward extension width of the heat-expandable refractory sheet 4 on the opposite surface of the through hole 2.
If the extension width is less than 10 mm, it becomes difficult to install the fireproof coating material in the vicinity of the through hole 2, and if the extension width exceeds 100 mm, the workability deteriorates due to bending due to the weight of the fireproof coating material. There is.

The heat-expandable fire-resistant sheet 4 is not particularly limited as long as it is made of a heat-expandable fire-resistant material that expands due to heat such as a fire. For example, the heat-expandable fire-resistant sheet as described in Japanese Patent Application Laid-Open No. 2007-198029. Can be used, specifically, a resin composition (I) containing a resin component such as a thermoplastic resin or an epoxy resin, a heat-expandable layered inorganic substance, an inorganic filler, or the like, an inorganic fiber, or a heat-expandable layered material. Examples thereof include those made of a binder resin composition (II) containing the resin component as a binder with respect to an inorganic substance, a sintered inorganic material, or the like.

Of each component of the resin composition (I) or the binder resin composition (II), the resin component will be described first.

Examples of the thermoplastic resin include polyolefin resins such as polypropylene resins, polyethylene resins, poly (1-) butene resins, and polypentene resins, polystyrene resins, acrylonitrile-butadiene-styrene (ABS) resins, and polycarbonates. Synthetic resins such as resin, polyphenylene ether resin, acrylic resin, polyamide resin, polyvinyl chloride resin, phenol resin, polyurethane resin, polyisobutylene, natural rubber, isoprene rubber, butadiene rubber, 1.2 -Polybutadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, chlorinated butyl rubber, ethylene-propylene rubber, chlorosulfonated polyethylene, acrylic rubber, epichlorohydrin rubber, polyvulase rubber, non-vulture rubber, silicon rubber, fluorine Examples include rubber substances such as rubber and urethane rubber.

As these synthetic resins and / or rubber substances, one kind or two or more kinds can be used.

The synthetic resin and / or the rubber substance may be further crosslinked or modified as long as the fire resistance performance of the foamed heat insulating material in the present invention is not impaired.

Next, among the components of the resin composition (I) or the binder resin composition (II), the heat-expandable layered inorganic substance will be described.

The heat-expandable layered inorganic material expands when heated, but the heat-expandable layered inorganic material is not particularly limited, and examples thereof include vermiculite, kaolin, mica, and heat-expandable graphite.

Thermally expandable graphite is a conventionally known substance, in which powders such as natural scaly graphite, thermally decomposed graphite, and kiss graphite are mixed with inorganic acids such as concentrated nitric acid, nitric acid, and selenic acid, and concentrated nitric acid, perchloric acid, and excess. A graphite interlayer compound was produced by treatment with a strong oxidizing agent such as chlorate, permanganate, dichromate, dichromate, hydrogen peroxide, etc., and the layered structure of carbon was maintained. It is a kind of raw crystalline compound.
As the heat-expandable graphite obtained by the acid treatment as described above, it is preferable to use one neutralized with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound or the like.

Examples of commercially available products of neutralized heat-expandable graphite include "GRAFGUARD # 160" and "GRAFGUARD # 220" manufactured by UCARCARBON, and "GREP-EG" manufactured by Tosoh Corporation.

Next, among the components of the above resin composition (I), the inorganic filler will be described.

The inorganic filler is not particularly limited, but for example, silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, magnesium hydroxide. , Aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dosonite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, potassium salts such as calcium silicate, talc, clay, mica , Montmorillonite, Bentnite, Active white clay, Sebiolite, Imogolite, Cerisite, Glass fiber, Glass beads, Silica-based balun, Aluminum oxide, Borone nitride, Silicon nitride, Carbon black, Graphite, Carbon fiber, Carbon balun, Charcoal powder, Various metals Powder, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum volate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, inorganic phosphorus compound, silica alumina fiber, Alumina fiber, silica fiber, zirconia fiber and the like can be mentioned. These can be used alone or in combination of two or more. The inorganic filler plays an aggregate role and contributes to the improvement of the strength of the expanded heat insulating layer generated after heating and the increase of the heat capacity.

For this reason, metal carbonates typified by calcium carbonate and zinc carbonate, aluminum hydroxide that imparts a heat absorbing effect during heating in addition to the role of aggregate, and hydrous inorganic substances typified by magnesium hydroxide are preferable, and alkali metals and alkalis are preferable. Earth metals and metal carbonates of Periodic Table IIb or mixtures of these with the hydrous inorganics are preferred.

Among the inorganic fillers, metal carbonates such as calcium carbonate and zinc carbonate that play an especially aggregate role; and water-containing inorganic substances such as aluminum hydroxide and magnesium hydroxide that impart an endothermic effect during heating in addition to the aggregate role. preferable.

Commercially available products of water-containing inorganic substances include, for example, "trade name: Heidilite H-42M" (manufactured by Showa Denko KK) with a particle size of 1 μm and "trade name: Heidilite H-31" with a particle size of 18 μm as aluminum hydroxide. (Made by Showa Denko) and the like.

Examples of commercially available calcium carbonate products include "trade name: Whiten SB Red" (manufactured by Shiraishi Calcium Co., Ltd.) with a particle size of 1.8 μm and "trade name: BF300" (manufactured by Bikita Flour Chemical Co., Ltd.) with a particle size of 8 μm. Can be mentioned.

Further, a phosphorus compound may be used in the resin composition (I) in order to improve flame retardancy.

The phosphorus compound is not particularly limited, and for example, various phosphate esters such as red phosphorus; triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresil diphenyl phosphate, xylenyl diphenyl phosphate; sodium phosphate, Metal phosphates such as potassium phosphate and magnesium phosphate; ammonium polyphosphates; compounds represented by chemical formula 1 and the like can be mentioned. One or more of these phosphorus compounds can be used.

Of these, red phosphorus, compounds represented by the following chemical formulas, and ammonium polyphosphates are preferable from the viewpoint of fire resistance, and ammonium polyphosphates are more preferable in terms of performance, safety, cost, and the like.

In the chemical formula, Rl and R3 represent hydrogen, a linear or branched alkyl group having 1 to 16 carbon atoms, or an aryl group having 6 to 16 carbon atoms.

R2 is a hydroxyl group, a linear or branched alkyl group having 1 to 16 carbon atoms, and 1 to 1 carbon atoms.
Represents a linear or branched alkoxyl group of 6, an aryl group having 6 to 16 carbon atoms, or an aryloxy group having 6 to 16 carbon atoms.

Examples of commercially available phosphorus compounds include "trade name: EXOLITAP 422" and "trade name: EXOLITAP 462" of Clariant AG.

It is considered that the phosphorus compound reacts with a metal carbonate such as calcium carbonate and zinc carbonate to promote the expansion of the metal carbonate. In particular, when ammonium polyphosphate is used as the phosphorus compound, a high expansion effect is obtained. Be done. It also acts as an effective aggregate and forms a residue with high shape retention after combustion.

Next, among the components of the binder resin composition (II) described above, examples of the inorganic fiber include ceramic fibers such as silica-alumina fiber, alumina fiber, silica fiber, and zirconia fiber.

When ceramic fibers are used, it is preferable to further use a sinterable inorganic material in combination. Examples of such a sinterable inorganic material include electrically insulating glass and the like. Specific examples of the electrically insulating glass include silicon dioxide in an amount of 50 to 60% by weight, aluminum oxide in an amount of 10 to 20% by weight, calcium oxide in an amount of 10 to 20% by weight, magnesium oxide in an amount of 1 to 10% by weight, and oxidation. Examples thereof include what is called E-glass in which boron is contained in the range of 8 to 13% by weight or the like.

Next, the content of each of the above components in the resin composition (I) and the binder resin composition (II) will be described.

The resin composition (I) contains 20 to 350 parts by weight of a heat-expandable layered inorganic substance and 50 to 400 parts by weight of an inorganic filler with respect to 100 parts by weight of a resin component such as a thermoplastic resin or an epoxy resin. Is preferable. The total amount of the heat-expandable layered inorganic substance and the inorganic filler is preferably in the range of 200 to 600 parts by weight. According to this formulation, the foamed heat insulating material can be expanded by heating such as a fire to obtain a required volume expansion coefficient, and after expansion, a residue having a predetermined heat insulating performance and a predetermined strength can be formed. The resin composition can achieve stable fire protection performance.

The binder resin composition (II) is in the range of 55 to 85% by weight of the inorganic fiber, 5 to 30% by weight of the heat-expandable layered inorganic material, 5 to 25% by weight of the sinterable inorganic material, and 5 to 15% by weight of the resin component. Those containing are preferable. According to this formulation, both fire resistance and shape retention are maintained.

Further, the resin composition (I) or the binder resin composition (II) used in the present invention may be, if necessary, phenol-based, amine-based, sulfur-based or the like, as long as the object of the present invention is not impaired. In addition to antioxidants, it can contain additives such as metal damage inhibitors, antistatic agents, stabilizers, cross-linking agents, lubricants, softeners, pigments, tackifier resins, and tackifiers such as polybutene and petroleum resins. ..

Each component of the resin composition (I) and the binder resin composition (II) is supplied to a known kneading device such as an extruder, a Banbury mixer, or a kneader mixer for melt kneading, or each component of the resin composition is used as an organic solvent. The resin composition (I) or the binder resin composition (II) can be obtained by suspending, heating and melting to form a paint, and then heat-curing as necessary.

The heat-expandable fire-resistant sheet 4 is available as a commercially available product. For example, a fire barrier manufactured by Sumitomo 3M Co., Ltd. (a heat-expandable fire-resistant sheet made of a resin composition containing chloroprene rubber and verculite, expansion coefficient: 3 times. , Thermal conductivity: 0.20 kcal / m · h · ° C), Medihicut of Mitsui Kinzoku Paint Co., Ltd. Thermal conductivity: 0.21 kcal / m · h · ° C), heat-expandable fire-resistant sheets such as Sekisui Chemical Co., Ltd.'s fiblock (heat-expandable fire-resistant sheet containing epoxy resin, butyl rubber, vinyl chloride as a resin component) Can be mentioned. Further, a sheet obtained by applying or molding a conventionally known refractory paint may be used.

The heat-expandable refractory sheet 4 is not particularly limited as long as it is insulated by the expansion layer when exposed to a high temperature such as in a fire and has the strength of the expansion layer, but is not particularly limited, but under heating conditions of 50 kW / m2. It is preferable that the volume expansion coefficient after heating for 30 minutes is 3 to 50 times. Further, if the heat-expandable refractory sheet 4 is made insulating, not only the fire resistance but also the insulating property is imparted.

Next, the penetration processing material 6 will be described. With reference to FIGS. 2 and 5, the duct 5 is inserted into the steel frame beam 1 via a heat-expandable resistant sheet 4 installed on the inner peripheral surface 8 of the through hole 2. The penetration treatment material 6 is arranged so as to straddle the duct 5 and the heat-expandable fire-resistant sheet 4, and straddle the heat-expandable fire-resistant sheet 4 and the steel frame beam 1. That is, the penetration treatment material 6 is continuously arranged on each of the two members of the duct 5, the heat-expandable refractory sheet 4, and the heat-expandable fire-resistant sheet 4 and the steel frame beam 1. Specifically, the penetration treatment material 6 extends substantially vertically from the first horizontal portion 6a arranged substantially parallel to the duct 5 and the first horizontal portion 6a on the duct 5, and is thermally expandable and fireproof. A first vertical portion 6b arranged on the side surface 4a of the sheet 4 and a second horizontal portion extending substantially vertically from the first vertical portion 6b and arranged on the outer peripheral surface 4b of the heat-expandable fireproof sheet 4. It includes a 6c and a second vertical portion 6d that extends vertically from the second horizontal portion 6c and is located on the steel beam 1. The upper and lower second vertical portions 6d and 6d extend to opposite surfaces (surfaces on the duct 5 side) 1a and 1b of the two parallel upper and lower portions of the steel frame beam 1, respectively. Therefore, the heat-expandable refractory sheet 4 is provided through the through hole 2 of the steel frame beam 1 via the duct 5 and the heat-expandable fire-resistant sheet 4 and between the heat-expandable fire-resistant sheet 4 and the steel frame beam 1. It is possible to prevent the spread of fire from one side (for example, the left side of FIG. 5) to the other side (for example, the right side of FIG. 5).

The penetration-treated material 6 may be formed from any fire-resistant material, and may be the same as or different from the material of the heat-expandable sheet 4. For example, the penetration-treated material 6 is a heat-expandable fire-resistant sheet that is the same as or similar to the material of the heat-expandable fire-resistant sheet 4 as described in Japanese Patent Application Laid-Open No. 2007-198029, and specifically, a thermoplastic resin, an epoxy resin, or the like. A binder containing the resin component as a binder for a resin composition (I) containing a resin component, a heat-expandable layered inorganic material, an inorganic filler, etc., an inorganic fiber, a heat-expandable layered inorganic material, a sintered inorganic material, etc. It is composed of the resin composition (II) and the like, and the resin composition (I) and the binder resin composition (II) are as described above with respect to the constituent components of the heat-expandable sheet 4.

As shown in FIG. 6, from the fireproof structure of FIG. 5, a fireproof coating material 7 is further provided on the steel frame beam 1. The fireproof coating material 7 can be provided by a method such as spraying a fireproof coating material such as rock wool on the steel frame beam 1.

The thickness of the fireproof coating material is appropriately determined by the fireproof time required for the steel frame beam, but is usually in the range of 20 to 65 mm, and is abbreviated as the extension width to the outside of the heat-expandable fireproof sheet described above. Equal is even more preferred.

The first embodiment described above has the following effects.

According to the first embodiment, since the penetration treatment material 6 is continuously arranged on the steel frame beam 1 and the heat-expandable fireproof sheet 4 provided in the through hole 2 of the steel frame beam 1, the fire resistance performance is improved. While securing it, it is possible to easily and surely close the gap and prevent the spread of fire due to a fire.

Further, since the penetration treatment material 6 is continuously arranged on the duct 5 and the heat-expandable refractory sheet 4, it is possible to prevent the spread of fire from one side to the other through the through hole 2 of the steel frame beam 1. can.

If the same material as the heat-expandable refractory sheet 4 is used as the penetration treatment material 6, the cost is low and the construction is easy.

The present invention is not limited to the first embodiment, and various modifications such as the following are possible.
-In the above-mentioned first embodiment, the heat-expandable refractory sheet 4 is used as the non-combustible material, but other non-combustible materials such as a metal sleeve, particularly a steel sleeve may be used.
As shown in FIG. 7A, the length of the heat-expandable fireproof sheet 4 is equal to or smaller than the axial length of the through hole 2, and the penetration treatment material 6 is placed on the duct 5 with the duct 5 above the duct 5. A first horizontal portion 6a arranged substantially parallel to the above, and a first vertical portion extending substantially vertically from the first horizontal portion 6a and arranged on the side surface 4a of the heat-expandable fireproof sheet 4 and the steel beam 1. 6e and may be provided. In this case, the first vertical portion 6e does not extend to the opposing surfaces 1a and 1b of the two parallel upper and lower portions of the steel frame beam 1, and may be terminated in the middle of the vertical portion of the steel frame beam 1. Also in this embodiment, the steel beam 1 and the heat-expandable fire-resistant sheet 4 provided in the through hole 2 of the steel beam 1 are continuously penetrated, and the duct 5 and the heat-expandable fire-resistant sheet 4 are continuously penetrated. Since the treatment material 6 is arranged, the fire resistance performance can be ensured, the gap can be easily and surely closed, and the spread of fire due to the fire can be prevented.

As shown in FIG. 7B, the heat-expandable refractory sheet 4 may include a portion 4c further extending above the steel frame beam 1 from the outer peripheral surface 4b of the heat-expandable refractory sheet 4. The penetration processing material 6 extends substantially vertically from the first horizontal portion 6a arranged substantially parallel to the duct 5 and the first horizontal portion 6a on the duct 5, and the side surface 4a of the heat-expandable fireproof sheet 4 extends. A first vertical portion 6b arranged above, a second horizontal portion 6c extending substantially vertically from the first vertical portion 6b and arranged on the outer peripheral surface 4b of the heat-expandable fireproof sheet 4, and a second It has a second vertical portion 6d that extends continuously vertically from the horizontal portion 6c and is located on the heat-expandable fireproof sheet 4. Also in this embodiment, the steel beam 1 and the heat-expandable fire-resistant sheet 4 provided in the through hole 2 of the steel beam 1 are continuously penetrated, and the duct 5 and the heat-expandable fire-resistant sheet 4 are continuously penetrated. Since the treatment material 6 is arranged, the fire resistance performance can be ensured, the gap can be easily and surely closed, and the spread of fire due to the fire can be prevented.
As shown in FIG. 8A, from the state of FIG. 4, the penetrating material 6 is arranged on the side surface 4a of the heat-expandable refractory sheet 4 without providing the duct 5, and the first vertical portion 6b. A second horizontal portion 6c arranged on the outer peripheral surface 4b of the heat-expandable refractory sheet 4 and a second vertical portion extending vertically continuously from the second horizontal portion 6c and arranged on the heat-expandable fireproof sheet 4. It may be provided with a portion 6d. In this embodiment, the through hole 2 is closed. Also in this embodiment, since the penetration treatment material 6 is continuously arranged on the steel frame beam 1 and the heat-expandable fireproof sheet 4 provided in the through hole 2 of the steel frame beam 1, the fire resistance performance is ensured. It is possible to easily and surely close the gap and prevent the spread of fire due to a fire.
As shown in FIG. 8 (b), the length of the heat-expandable refractory sheet 4 may be the same as or smaller than the axial length of the through hole 2 with respect to FIG. 8 (a). Also in this embodiment, since the penetration treatment material 6 is continuously arranged on the steel frame beam 1 and the heat-expandable fireproof sheet 4 provided in the through hole 2 of the steel frame beam 1, the fire resistance performance is ensured. It is possible to easily and surely close the gap and prevent the spread of fire due to a fire.
As shown in FIG. 8C, the heat-expandable refractory sheet 4 extends continuously from the outer peripheral surface 4b of the heat-expandable refractory sheet 4 onto the vertical portion of the steel frame beam 1 and the portion 4c. A portion 4d extending substantially vertically onto the beam 1 may be provided, and the penetration processing material 6 may be configured to be in contact with the portion 4d and terminated. Also in this embodiment, since the penetration treatment material 6 is continuously arranged on the steel frame beam 1 and the heat-expandable fireproof sheet 4 provided in the through hole 2 of the steel frame beam 1, the fire resistance performance is ensured. It is possible to easily and surely close the gap and prevent the spread of fire due to a fire.
-In the first embodiment and the above alternative example, an example in which the heat-expandable fireproof sheet 4 and the penetration treatment material 6 are continuously arranged is shown. For example, the heat-heat expansion fireproof sheet 4 and the penetration treatment material 6 are continuously arranged. 6 may be arranged in a plurality of portions so as to be overlapped with each other, in contact with each other, or slightly separated from each other.

1 ... Steel beam, 2 ... Through hole, 4 ... Heat-expandable refractory sheet as non-combustible material, 5 ... Duct as piping, 6 ... Penetration treatment material, 8 ... Inside as a surface for partitioning the through hole Circumferential surface.

Claims (3)

It is a fireproof structure of a beam with a through hole,
Piping or wiring is inserted through the through hole,
A non-combustible material is placed on the surface that partitions the through hole in the beam.
It is characterized in that a penetration processing material is arranged so as to straddle the beam, the non-combustible material, and the pipe or wiring and close a gap between the non-combustible material and the pipe or wiring. Fireproof structure of the beam. The fireproof structure of a beam according to claim 1 , wherein the nonflammable material comprises a heat- expandable fireproof sheet. The fireproof structure of a beam according to claim 1 or 2 , wherein the penetration treatment material is made of a heat-expandable fireproof sheet.

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