JP5001629B2 - Fireproof pillar and unit building using it - Google Patents

Description

  The present invention relates to a refractory column and a unit building using the same, and more particularly to a refractory column having a refractory structure in which a plurality of columns constituting a building unit are horizontally adjacent to each other and a unit building using the same.

  Conventionally, as this type of fireproof pillar, there is a fireproof pillar described in Patent Document 1. As shown in FIG. 7, the refractory pillar described in Patent Document 1 is formed by covering four pillars 30 with refractory coating materials 31 and 32. That is, fireproof coating materials 31 such as ceramic fiber and asbestos calcium silicate having a thickness of 12.5 mm are provided in advance at the factory on each of the two side surfaces facing the units of each pillar 30, and each first floor The outer surfaces of the gaps 35, 36 between the units are also covered with a fireproof coating 32, and thus the four columns 30, 30,... In this column gathering portion are completely covered with the fireproof coating, thereby In addition, fire resistance performance of 1 hour or more is ensured. Further, an interior base material 33 such as a gypsum board is attached to the outer surfaces of these fireproof covering materials 31 and 32.

In addition, the specifications exemplified in the notification of the Ministry of Land, Infrastructure, Transport and Tourism, and the structure of other refractory pillars are generally a specification that covers the casing with an ALC plate having a thickness of 75 mm or more, an RC structure, and the like. Furthermore, there is a specification of spraying rock wool or the like in order to apply a fireproof coating to members constituting a frame such as a column or a beam, and these are applied in field work.
Japanese Unexamined Patent Publication No. 7-54424 (paragraph [0017], FIG. 7)

  By the way, the refractory column described in the above-mentioned Patent Document 1 does not accumulate and accumulate the thermal expansion of beams between adjacent spans, and can greatly suppress the excessive deformation of the entire building. However, there is a problem in that the configuration is complicated and the operation is complicated and the cost is increased. In addition, when an ALC plate with a thickness of 75 mm or more is placed around the pillar and covered, it is necessary to treat the joints on each side with a fire-resistant adhesive, etc. Etc. had the problem of being thick and heavy. And the specifications etc. which spray rock wool etc. were inferior to field workability | operativity and safety | security, and there were many things with large work dispersion | variation.

  The present invention has been made in view of such problems, and the object of the present invention is to ensure sufficient fire resistance even if the fireproof board covering the pillar is thinned, and to reduce the volume of the covering portion. It is possible to provide a fireproof pillar that can be reduced in cost by using a lightweight fireproof board. It is another object of the present invention to provide a fireproof column that is less affected by work variations and has stable fireproof performance, and a unit building using the fireproof column.

In order to achieve the above object, the fireproof pillar according to the invention of claim 1 has a plurality of pillars arranged adjacent to each other, and a non-combustible material and a thermally expandable fireproof sheet are laminated along the outer periphery of the pillars. The fireproof board is disposed so that the plurality of pillars are covered with the fireproof board, and the fireproof board disposed along the outer periphery of the plurality of pillars is disposed such that the thermally expandable fireproof sheet is a surface. , A support is fixed to the plurality of pillars, a gap is formed between the fireproof board and the plurality of pillars with respect to the fixed support, and a metal plate receiving plate is disposed on the outer peripheral surface of the fireproof board In addition, the fireproof board is fixed to the plurality of pillars by a fixture with the receiving plate sandwiching the fireproof board . That is, a fireproof board in which a non-combustible material and a heat-expandable fireproof sheet are laminated is fireproof coated on a plurality of pillars, thereby exhibiting sufficient fireproof performance with a thin fireproof board.

The fireproof pillar according to a second aspect of the present invention is characterized in that the backing plate is a washer. Moreover, the refractory pillar according to claim 3 is characterized in that the receiving plate is a long metal plate. The refractory pillar according to claim 4, wherein the refractory board is covered with a thermally expandable refractory sheet that is extended and covered on an exposed end face of the incombustible material. In the pillar, the support has a shape in which one corner of a steel pipe having a square cross section is removed, two long sides perpendicular to each other, and a short continuous from the ends of these long sides at right angles. It is characterized in that it comprises a side.

The fireproof pillars according to the inventions according to claims 1 to 5 configured as described above, when a plurality of pillars constituting a building frame are heated by a fire or the like, the heat of the fireproof board covering the pillars. The inflatable refractory sheet expands to form an insulative heat insulating layer, which can block heat transfer to the plurality of internal pillars. As described above, since the fireproof board having a light and thin structure can realize a sufficient fireproof performance by using a plurality of pillars as a fireproof structure, the fireproof pillar can be reduced in size and the effective area of the building can be increased. Moreover, cost reduction can be achieved by using a non-combustible material with low cost, and the construction can be simplified and the influence of work variation can be reduced. In addition, the fire-proof column configured in this way blocks heat from the expanded heat-insulating layer and the non-combustible material when the heat-expandable fire-resistant sheet of the fire-resistant board expands when heat from a fire or the like is applied to the fire-proof column. The heat transfer can be blocked by the gap formed between the plurality of pillars, the fire resistance can be further improved, and the deterioration of the proof stress of the pillars can be prevented.

The fireproof column according to the invention of claim 6 is characterized in that the non-combustible material is a gypsum board, and the thermally expandable fireproof sheet is adhesively supported on an outer peripheral surface of the gypsum board. Since the fire-resistant pillar constructed in this way is integrated with the surface of an inexpensive gypsum board with a thermally expandable fire-resistant sheet adhered and supported, the construction material is simplified by making the covering material covering multiple pillars into parts. As a result, the work variation can be reduced and the cost can be reduced.

The fire-proof column according to the invention of claim 7 has a volume expansion coefficient of 3 to 50 times after the heat-expandable fire-resistant sheet is heated for 30 minutes under a heating condition of 50 kW / m ² , and a compression test. It is characterized in that it is formed of a material having a breaking point stress after volume expansion measured by using a 0.25 cm ² indenter with a vessel, of 0.05 kgf / cm ² or more. The refractory column configured in this way has a predetermined strength when the thermally expandable refractory sheet affixed to the surface of the refractory board is expanded by heat such as fire to form an expanded heat insulating layer, Since the expansion heat insulation layer is not destroyed by the momentum of a flame or the like, the fire resistance performance is stabilized.

The fire-proof column according to the invention of claim 8 is such that the thermally expandable fire-resistant sheet contains 10 to 300 parts by weight of a thermally expandable inorganic substance and 30 to 400 parts by weight of an inorganic filler with respect to 100 parts by weight of the resin component. And it is formed with the material of the resin composition which contains 40-500 weight part of total amounts of the said thermally expansible inorganic substance and an inorganic filler. The fireproof pillar configured as described above has a sufficient expansion and heat insulation layer when a fireproof board that covers a plurality of pillars with a fireproof coating is expanded by heat such as a fire. The heat insulation is stable and the strength of the pillars can be prevented from decreasing.

The unit building according to claim 9 is characterized in that the fireproof pillar according to any one of the above is used. Unit buildings constructed in this way can ensure sufficient fire resistance performance by covering multiple pillars with a thin and lightweight fireproof board, thus reducing the volume of fireproof pillars and increasing the effective space in the building. it can.

  The fireproof pillar of the present invention can reduce the volume of the construction part of the fireproof coating and can increase the effective area inside the building without damaging the fireproof performance even if the fireproof structure is covered with a thin fireproof board by covering a plurality of pillars. . In addition, construction is easy with simple work, variation in work can be reduced, and fire resistance can be stabilized. Furthermore, the volume of the refractory column of the unit building can be reduced, and the effective area in the building can be increased.

  Hereinafter, an embodiment of a fireproof pillar according to the present invention and a unit building using the same will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a building unit constituting a refractory column according to the present embodiment, and FIG. 2 is a schematic diagram of a three-story unit building that is configured by horizontally laying a plurality of building units and vertically stacking them. 3 is a horizontal sectional view as seen from the direction of the arrows AA in FIG. 2, and FIG. 4 is an enlarged horizontal sectional view of the column gathering portion B in FIG.

  1-4, the building unit 1 is bridged between four floor beams 2, 2,..., Four ceiling beams 3, 3,. A plurality of ceiling beams 4, 4... And four pillars 5, 5. Then, floor panels 6, 6... Are attached to the box-shaped frame floor beams 2, 2,..., And a ceiling surface material (not shown) is fixed below the ceiling beams 4, 4,. As shown in FIG. 3, the building unit 1 is a unit building U in which a plurality of units are arranged in series, and the wall panels 7 (outer wall panel 7A, inner wall panel 7B, and field wall panel 7C) are tapping screws and studs. It is attached and configured using a connector such as a pin, bolt, or one-side rivet. The floor girder 2, 2 ... and the ceiling girder 3, 3 ... are formed of channel steel. In this example, a beam member having a length of about 5.5 to 5.6 m is provided on the girder side (long side). Moreover, a beam member having a length of about 2.1 to 2.2 m is used on the wife side (short side). The columns 5, 5... Are made of 100 mm square steel pipes, and the ceiling beams 4, 4... Are made of U-shaped channel steel.

  The floor panel 6 is an ALC (aerated concrete) plate having a thickness of 125 mm, which ensures a fire resistance of 2 hours or more (according to a fire test method for JIS A 1304 building structure). Among the wall panels 7, the outer wall panel 7A has an ALC plate having a thickness of 100 mm, the inner wall panel 7B has a total thickness of 68 mm asbestos calcium silicate plate and a plaster board, and the boundary wall panel 7C has a total thickness of 116 mm. Laminates of asbestos calcium silicate board and glass fiber-containing gypsum board are used, respectively, thereby constituting a fire-resistant section having a fire-proof time of 1 hour or more (according to the fire resistance test method of a building structure part), and an outer wall panel Between 7A and the inner wall panel 7B, a heat insulating sound absorbing material (not shown) such as glass wool or rock wool is filled. Of course, the material of the wall panel is not limited to the above.

  In order to increase the industrial production rate of the building, the building unit 1 having the above-described structure is produced in advance in a factory as a box having a size that can be transported, and then transported to a construction site for construction and assembly. Is done. Assembling, the building unit 1 is lifted by a crane on a pre-constructed foundation 8 at a building site, and first, the building units 1 constituting the first floor (hereinafter referred to as the first floor units 1a, 1a...) Are mutually connected. It is installed at a predetermined interval and fastened to the foundation 8 with anchor bolts. Next, building units (hereinafter referred to as second-floor units 1b, 1b ...) constituting the second floor are stacked on top of the first-floor units 1a, 1a ... by the crane, and the column bases and first-floor of the second-floor units 1b, 1b ... The stigmas of the units 1a, 1a... Are connected to each other by bolts. Thereafter, building units constituting the third floor (hereinafter referred to as third-floor units 1c, 1c...) Are stacked on the second-floor units 1b, 1b... And similarly coupled to the second-floor units 1b, 1b. The In this manner, the three-story unit building U is completed by arranging and arranging a plurality of building units in the horizontal direction and the vertical direction.

  In the unit building U configured as described above, when four building units are arranged in a row in the shape of a “field” in the horizontal direction, as shown in FIG. A plurality of (four) steel pipe columns 5, 5... Are arranged adjacent to the character of “field” to form a column concentrating portion B, and this column concentrating portion has a fireproof structure. A pillar 10 is configured. In the present embodiment, since a three-story building is shown, the building units 1, 1... Are arranged in a row in the horizontal direction and arranged in the vertical direction. That is, when four building units are horizontally arranged in a rice field, the four central pillars are arranged in a rice field. In this embodiment, when a plurality of building units are juxtaposed in the horizontal direction, the pillar assembly B formed at the center of the unit building is covered with a fireproof board to form a fireproof pillar, which is not shown in the figure. A column concentrator is formed at the center of each floor.

  In the column concentrating portion B adjacent to the four steel pipe columns 5, 5 ... shown in FIG. 4, the four steel pipe columns 5, 5 ... constituting the housing of the building unit 1, 1 ... have an outer shape of 100 mm square and a thickness. The thing of about 6 mm is used. And these steel pipe pillars have a gap of about 10 to 15 mm, respectively, and are arranged adjacent to the character of “field”. On the outer peripheral surface of the four steel pipe columns 5, 5..., Four fireproof boards 15 to be described later for protecting the plurality of steel pipe columns from a fire or the like are fixed to the steel pipe columns with gaps. .. Are fixed as supports. The support 11 is formed by bending a galvanized iron plate having a thickness of about 0.4 mm, and is formed into a square pipe having a cross-sectional shape of 40 mm long side and 5 mm short side. Needless to say, the shape of the support is not limited to the rectangular cross-sectional shape, and any shape may be used as long as the fireproof board can be fixed to the steel pipe column, for example, an angle shape. Moreover, although the elongate support along the steel pipe pillar was shown, you may fix a short elongate support along a pillar partially.

  The four supports 11, 11... Are fixed to the outer peripheral surfaces of the steel pipe columns 5, 5..., For example, by welding or screwing, and are fixed so as to protrude 5 mm from the outer peripheral surface of the steel pipe columns in the long side direction. That is, the support 11 is fixed corresponding to the four corners of the four steel pipe columns. When four fireproof boards 15 are arranged and fixed on the outside of the steel pipe columns 5, 5,... Through this support, a 5 mm clearance (gap) is formed between the steel pipe columns and the fireproof board. It is configured. Moreover, since the fireproof board 15 is fixed to the four corners of the four steel pipe columns, the fixed state is stable.

  The fireproof board 15 is composed of a board in which a noncombustible material and a thermally expandable fireproof sheet are laminated. Lamination | stacking with a nonflammable material and a thermally expansible fireproof sheet | seat is suitably used, such as what was previously fixed using the adhesive agent, what was stuck and laminated | stacked at the time of construction, etc. As the incombustible material, a 9.5 mm thick gypsum board 16 is used in the present embodiment, and a 1 mm thick heated and expanded sheet 17 made of a thermally expandable refractory material is used as the thermally expandable refractory sheet. And the heat expansion sheet | seat 17 is adhere | attached and laminated | stacked on the surface of the gypsum board 16, and the thin fireproof board 15 of 10.5 mm thickness is comprised. The gypsum board 16 used as an incombustible material serving as a base of the fireproof board 15 has a thickness of preferably 9.5 mm or more, more preferably a thickness of 12.5 mm or more in order to obtain a desired fireproof performance. Is preferable. Although not shown, it is preferable to provide an interior material such as gypsum board on the indoor side of the fireproof board 15 with a heat insulating material such as glass wool interposed therebetween, but an interior finishing material such as a cloth is directly attached to the fireproof board. Also good.

  The fireproof boards 15, 15... Configured as described above are continuously arranged along the outer periphery of the column concentrating portion B composed of the four steel pipe columns 5, 5. It has a fireproof structure and has a function of protecting the steel pipe columns 5, 5. When the fireproof board 15 is disposed with a gap in the steel pipe column via the supports 11, 11..., The fireproof board 15 is cut to such a width that no gap is formed between them. That is, one end face of one fireproof board is cut to such a width as to contact the inner face of the adjacent fireproof board. The belt-shaped fireproof board cut to a predetermined width is fixed by screwing from the outer peripheral surface with a fixing tool such as a screw 18. A large washer 19 having a diameter of about 20 mm is used for the screw 18. In this way, the refractory column 10 is configured as a refractory structure by covering the plurality of steel pipe columns 5, 5 ... with the refractory board 15, and in this embodiment, a clearance (5mm) is provided around the outer periphery of the steel tube column, The thin fireproof board 15 of 10.5 mm or more is continuously arranged without gaps. Note that the refractory column 10 may be one in which the refractory board 15 is fixed in a state where there is no gap around the outer periphery of the steel pipe columns 5, 5. In addition, the four fireproof boards 15, 15... Are all fixed to four surfaces of the steel pipe columns 5, 5,... With two screws, but the two fireproof boards are fixed to at least two surfaces. The two refractory boards may be fixed to a fixed refractory board.

The heat-expandable refractory material constituting the heat-expandable sheet 17 is not particularly limited as long as it is a material that expands when heated by a fire or the like to form a heat-insulating layer and protects the incombustible material inside, preferably The material has a volume expansion coefficient of 3 to 50 times after being heated for 30 minutes under a heating condition of 50 kW / m ² . If the volume expansion rate is less than 3 times, the thickness of the expansion component is not sufficient and the fire resistance is reduced. If the volume expansion rate is more than 50 times, the strength of the expansion heat insulating layer is lowered and the effect of preventing the penetration of the flame is reduced. Therefore, the above range is preferable. More preferably, the volume expansion coefficient is 5 to 40 times, and more preferably 8 to 35 times.

As described above, the thermally expandable refractory material is preferably a material having a predetermined strength by combining the carbonized component and the expanded component in order that the expanded heat insulating layer protects the incombustible material inside. As the strength of the expanded heat insulating layer, the stress at break when the sample after volume expansion was measured at a compression speed of 0.1 m / s using a compression tester with an indenter of 0.25 cm ² was 0.05 kgf. / Cm ² or more is required. When the stress at break is less than 0.05 kgf / cm ² , the expanded heat insulating layer is easily broken by a fire force, and the fire resistance performance is lowered. More preferably, it is 0.1 kgf / cm ² or more.

  Next, the heat-expandable refractory material constituting the above-described heat-expandable sheet 17 will be described in detail.

  The resin component of the resin composition constituting the thermally expandable refractory material adhered to the surface of the refractory board is not particularly limited. For example, polyolefin such as polypropylene resin, polyethylene resin, polybutene resin, polypentene resin, etc. Thermoplastic resins such as a series resin, a polystyrene series resin, an acrylonitrile-butadiene-styrene series resin, a polycarbonate series resin, a polyphenylene ether series resin, an acrylic series resin, a polyamide series resin, and a polyvinyl chloride series resin are used.

  Further, instead of the thermoplastic resin, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene rubber (SBR) , Chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (IIR), ethylene-propylene rubber (EPR, EPDM), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CO, ECO) ), Polyvulcanized rubber (T), silicone rubber (Q), fluororubber (FKM, FZ), urethane rubber (U) and the like can be used. Furthermore, thermosetting resins such as polyurethane, polyisocyanate, polyisocyanurate, phenol resin, epoxy resin, urea resin, melamine resin, unsaturated polyester resin, and polyimide can be used.

  Among these resins, a polyolefin resin or a rubber substance is preferable from the viewpoint of being moldable at a temperature lower than the expansion temperature when blending a thermally expandable inorganic material, particularly thermally expandable graphite, which will be described later. Is preferred. Examples of the polyethylene resin include an ethylene homopolymer, a copolymer containing ethylene as a main component, a mixture thereof, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, and the like.

  Examples of the copolymer having ethylene as a main component include ethylene-α-olefin copolymers having an ethylene portion as a main component, and examples of the α-olefin include 1-hexene and 4-methyl. Examples include -1-pentene, 1-octene, 1-butene, and 1-pentene. Specific products of the ethylene-α-olefin copolymer include commercially available products such as “CGCT” manufactured by DuPont Dow and “EXACT” manufactured by ExxonMobil Chemical. These polyolefin resins may be used alone or in combination of two or more. Moreover, in order to improve fireproof performance more, the above-mentioned rubber substance is preferable from the viewpoint that a large amount of filler can be blended.

  Further, as described above, in order to allow the heat-expandable sheet 17 made of a heat-expandable refractory material to be bonded to the gypsum board 16 which is a non-combustible material, the resin composition itself preferably has adhesiveness, and the method Examples thereof include adding a tackifier resin, a plasticizer, fats and oils, a low molecular weight compound and the like to the rubber substance. The tackifying resin is not particularly limited. For example, rosin, rosin derivative, dammar resin, copal, coumarone-indene resin, polyterpene, non-reactive phenol resin, alkyd resin, petroleum hydrocarbon resin, xylene resin, epoxy resin, etc. Is mentioned.

  Although it is difficult for a plasticizer that imparts tackiness to exhibit tackiness alone, it is possible to improve tackiness in combination with the tackifier resin. For example, phthalate ester plasticizer, phosphate ester plasticizer, adipate ester plasticizer, sebacate ester plasticizer, ricinoleate ester plasticizer, polyester plasticizer, epoxy plasticizer, chlorinated paraffin, etc. Is mentioned.

  Oils and fats that impart tackiness can be used for the purpose of imparting plasticity and tackiness regulators because they have the same action as plasticizers. The fats and oils are not particularly limited, and examples thereof include animal fats and oils, vegetable fats and oils, mineral oils, and silicone oils. Further, the low molecular weight compound imparting tackiness can be used for the purpose of improving cold resistance and flow control in addition to imparting tackiness. It does not specifically limit as a low molecular weight compound, For example, a low molecular weight butyl rubber, a polybutene type compound, etc. are mentioned.

  Furthermore, a phenol resin and an epoxy resin are preferable from the viewpoint of increasing the flame retardancy of the resin itself and improving the fire resistance. In particular, an epoxy resin is preferred because the selection of the molecular structure is wide and it is easy to adjust the fire resistance and mechanical properties of the resin composition. The epoxy resin is not particularly limited, but is basically a resin obtained by reacting a monomer having an epoxy group with a curing agent. Examples of the monomer having an epoxy group include a bifunctional glycidyl ether type, a bifunctional glycidyl ester type, and a polyfunctional glycidyl ether type.

  Examples of the bifunctional glycidyl ether type monomer include polyethylene glycol type, polypropylene glycol type, neopentyl glycol type, 1,6-hexanediol type, trimethylolpropane type, bisphenol A type, bisphenol F type, propylene oxide- Examples thereof include bisphenol A type and hydrogenated bisphenol A type. Examples of the bifunctional glycidyl ester type monomer include hexahydrophthalic anhydride type, tetrahydrophthalic anhydride type, dimer acid type, and p-oxybenzoic acid type.

  Furthermore, examples of the polyfunctional glycidyl ether type include a phenol novolak type, an orthocresol type, a DPP novolak type, a dicyclopentadiene / phenol type, and the like. These may be used alone or in combination of two or more. Moreover, the monomer which has an above described epoxy group may be used independently, and 2 or more types may be used together.

  Examples of the curing agent for reacting with a monomer having an epoxy group to obtain an epoxy resin include polyaddition type and catalyst type. Examples of polyaddition type curing agents include aliphatic polyamines or modified amines thereof, aromatic polyamines, acid anhydrides, polyphenols, polymercaptans, and the like. Examples of catalyst type curing agents include tertiary amines, Examples include imidazoles, Lewis acids, Lewis bases and the like. In addition, the said hardening | curing agent may be used independently and 2 or more types may be used together.

In addition, other resins may be added to the epoxy resin. If the amount of other resin added increases, the effect of the epoxy resin will not be manifested, so the amount of other resin added to the epoxy resin 1 is preferably 5 (weight ratio) or less. Flexibility may be imparted to the epoxy resin so that it can be attached to a non-combustible material having various thicknesses. Examples of methods for imparting flexibility include the following methods. .
(1) Increase the molecular weight between cross-linking points.
(2) Reduce the crosslinking density.
(3) Introducing a soft molecular structure.
(4) A plasticizer is added.
(5) Introducing an interpenetrating network (IPN) structure.
(6) Disperse and introduce rubber-like particles.
(7) Introducing microvoids.

  The method (1) is a method in which the distance between the cross-linking points is increased by causing a reaction using an epoxy monomer having a long molecular chain and / or a curing agent in advance, thereby expressing flexibility. For example, polypropylene diamine or the like is used as the curing agent. The method (2) is a method of developing flexibility by reducing the cross-linking density in a certain region by reacting with an epoxy monomer and / or a curing agent with few functional groups. As the curing agent, for example, a bifunctional amine is used, and as the epoxy monomer, for example, a monofunctional epoxy is used.

  The method (3) is a method for expressing flexibility by introducing an epoxy monomer having a soft molecular structure and / or a curing agent. As the curing agent, for example, a heterocyclic diamine, and as an epoxy monomer, for example, alkylene diglycol diglycidyl ether or the like is used. The method (4) is a method in which a non-reactive diluent such as DOP, tar, petroleum resin, or the like is added as a plasticizer.

  The method (5) is a method of expressing flexibility with an interpenetrating network (IPN) structure in which a resin having another soft structure is introduced into the crosslinked structure of the epoxy resin. The method (6) is a method in which liquid or granular rubber particles are compounded and dispersed in an epoxy resin matrix. Polyester ether or the like is used as the epoxy resin matrix. The method (7) is a method of expressing flexibility by introducing microvoids of 1 μm or less into the epoxy resin matrix. A polyether having a molecular weight of 1000 to 5000 is added as an epoxy resin matrix.

  By adjusting the rigidity and flexibility of the epoxy resin, a sheet having flexibility can be obtained from a hard plate-like material, and a heat-expandable sheet can be attached according to a non-combustible material having various thicknesses. It becomes. Any of the above-described resins may be used alone, or a blend of two or more resins may be used to adjust the melt viscosity, flexibility, and tackiness of the resin. Furthermore, the resin may be crosslinked or modified within a range that does not impair the fire resistance of the resin composition. It does not specifically limit as a method of bridge | crosslinking or modification | denaturation, It can carry out by a well-known method. Crosslinking or modification may be performed after blending various fillers used in the present invention or simultaneously with blending, or a resin that has been crosslinked or modified in advance may be used.

  The heat-expandable inorganic material contained in the heat-expandable refractory material constituting the heat-expandable sheet is not particularly limited as long as it is a heat-expandable inorganic material that expands by heating. For example, vermiculite, kaolin, mica, heat-expandable Examples thereof include graphite, metal silicate, and borate. Among these, thermally expandable graphite is preferable because of its low expansion start temperature and high expansion.

  Thermally expandable graphite is a conventionally known substance, and powders such as natural scaly graphite, pyrolytic graphite, and quiche graphite are mixed with inorganic acids such as concentrated sulfuric acid, nitric acid, and selenic acid, concentrated nitric acid, perchloric acid, and perchlorine. This is a crystalline compound in which a graphite intercalation compound is produced by treatment with a strong oxidizing agent such as acid salt, permanganate, dichromate, hydrogen peroxide, etc., and maintains a layered structure of carbon. It is preferable to use the heat-expandable graphite obtained by the acid treatment as described above, further neutralized with ammonia, an aliphatic lower amine, an alkali metal compound, an alkaline earth metal compound, or the like.

  Examples of the aliphatic lower amine include monomethylamine, dimethylamine, trimethylamine, ethylamine, propylamine, and butylamine. Examples of the alkali metal compound and the alkaline earth metal compound include hydroxides such as potassium, sodium, calcium, barium, and magnesium, oxides, carbonates, sulfates, and organic acid salts.

  The particle size of the thermally expandable graphite is preferably 20 to 200 mesh. If the particle size is smaller than 200 mesh, the degree of expansion of graphite is small, and a sufficient expanded heat insulating layer cannot be obtained. If the particle size is larger than 20 mesh, there is an advantage that the degree of expansion of graphite is large. In this case, dispersibility deteriorates, and physical properties are inevitably lowered. Examples of commercially available products of thermally expandable graphite include “GREP-EG” manufactured by Tosoh Corporation, “GRAFGUARD” manufactured by GRAFTECH, and the like.

  It is preferable to add an inorganic filler to the resin composition constituting the thermally expandable refractory material. When the expanded heat insulating layer is formed, the inorganic filler increases the heat capacity and suppresses heat transfer, and works as an aggregate to improve the strength of the expanded heat insulating layer. The inorganic filler is not particularly limited, and examples thereof include metal oxides such as alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, and ferrites; calcium hydroxide, magnesium hydroxide And water-containing inorganic substances such as aluminum hydroxide and hydrotalcite; metal carbonates such as basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, and barium carbonate.

  In addition to these, inorganic fillers include calcium salts such as calcium sulfate, gypsum fiber, calcium silicate; silica, diatomaceous earth, dosonite, barium sulfate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, Imogolite, sericite, glass fiber, glass beads, silica balun, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balun, charcoal powder, various metal powders, potassium titanate, magnesium sulfate “MOS (Trade name), lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dehydrated sludge and the like. These inorganic fillers may be used alone or in combination of two or more. Among the inorganic fillers, hydrous inorganic substances and / or metal carbonates are preferable.

  The water-containing inorganic substance absorbs heat due to the water generated by the dehydration reaction during heating, and the temperature rise is reduced to improve the fire resistance, and the oxide remains after heating, which acts as an aggregate This is preferable in that the strength of the expanded layer is improved. Among hydrous inorganic substances, metal hydroxides such as calcium hydroxide, magnesium hydroxide, and aluminum hydroxide are particularly preferable because they produce a large amount of water and exhibit more fire resistance. Magnesium hydroxide and aluminum hydroxide have different temperature ranges that exhibit the dehydration effect. If used together, the temperature range that exhibits the dehydration effect will expand, and an effective temperature rise suppression effect will be obtained. Is preferred.

  The above-mentioned metal carbonate generates carbon dioxide gas by the decarboxylation reaction during heating, and promotes the formation of the expanded layer, and the strength of the expanded layer due to the oxide remaining after heating and acting as an aggregate Is preferable in terms of improvement. Among metal carbonates, metal carbonates belonging to Group II of the periodic table, such as calcium carbonate, magnesium carbonate, zinc carbonate, and strontium carbonate, are particularly preferable because carbonation reaction easily occurs.

  As a particle size of an inorganic filler, 0.5-100 micrometers is preferable, More preferably, it is 1-50 micrometers. When the addition amount of the inorganic filler is small, the dispersibility largely affects the performance, so that the particle size is preferably small. However, when it is less than 0.5 μm, secondary aggregation occurs and the dispersibility deteriorates. When the addition amount is large, the viscosity of the resin composition increases and moldability decreases as the high filling progresses, but the viscosity of the resin composition can be decreased by increasing the particle size. A thing with a large diameter is preferable. When the particle size exceeds 100 μm, the surface properties of the molded body and the mechanical properties of the resin composition are lowered.

  In addition, it is more preferable to use an inorganic filler in combination with an inorganic filler having a large particle size and a particle having a small particle size. By using the filler in combination, a high filling is achieved while maintaining the mechanical performance of the expanded heat insulating layer. Can be realized. As the inorganic filler, for example, for aluminum hydroxide, “Hijilite H-31” (manufactured by Showa Denko) having a particle size of 18 μm, “B325” (manufactured by ALCOA) having a particle size of 25 μm, and calcium carbonate, Examples include 1.8 μm “Whiteon SB Red” (manufactured by Bihoku Powdered Industries Co., Ltd.), “BF300” (manufactured by Bihoku Powdered Industries Co., Ltd.) having a particle size of 8 μm, and the like.

  In the resin composition constituting the heat-expandable refractory material, a phosphorus compound may be further added in addition to the above components in order to increase the strength of the expansion heat insulating layer and improve the fire resistance performance. The phosphorus compound is not particularly limited. For example, red phosphorus; various phosphate esters such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate; sodium phosphate, Examples thereof include metal phosphates such as potassium phosphate and magnesium phosphate; ammonium polyphosphates; compounds represented by the following chemical formula (1), and the like. Among these, from the viewpoint of fire resistance, red phosphorus, ammonium polyphosphates, and compounds represented by the following chemical formula (1) are preferable, and ammonium polyphosphates are more preferable in terms of performance, safety, cost, and the like. .

  In the chemical formula (1), R1 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, a linear or branched alkoxyl group having 1 to 16 carbon atoms, an aryl group having 6 to 16 carbon atoms, or a carbon number Represents 6 to 16 aryloxy groups.

  As red phosphorus, commercially available red phosphorus can be used, but from the viewpoint of safety such as moisture resistance and not spontaneously igniting during kneading, a material in which the surface of red phosphorus particles is coated with a resin is preferably used. The ammonium polyphosphates are not particularly limited, and examples thereof include ammonium polyphosphate and melamine-modified ammonium polyphosphate. Ammonium polyphosphate is preferably used from the viewpoint of handleability and the like. Examples of commercially available products include “AP422” and “AP462” manufactured by Clariant, “FR CROS 484” and “FR CROS 487” manufactured by Budenheim Iberica.

  The compound represented by the chemical formula (1) is not particularly limited. For example, methylphosphonic acid, dimethyl methylphosphonate, diethyl methylphosphonate, ethylphosphonic acid, propylphosphonic acid, butylphosphonic acid, 2-methylpropylphosphonic acid, t- Butylphosphonic acid, 2,3-dimethyl-butylphosphonic acid, octylphosphonic acid, phenylphosphonic acid, dioctylphenylphosphonate, dimethylphosphinic acid, methylethylphosphinic acid, methylpropylphosphinic acid, diethylphosphinic acid, dioctylphosphinic acid, phenylphosphine Examples include acid, diethylphenylphosphinic acid, diphenylphosphinic acid, bis (4-methoxyphenyl) phosphinic acid and the like. Among them, t-butylphosphonic acid is preferable in terms of high flame retardancy although it is expensive. The above phosphorus compounds may be used alone or in combination of two or more.

  When the phosphorus compound is exposed to a high temperature such as a fire, it changes to a polyphosphoric acid compound, which acts as an inorganic binder and exhibits the effect of improving the strength of the expanded heat insulating layer. Among the above metal carbonates, metal carbonates belonging to Group II of the Periodic Table, for example, calcium carbonate, magnesium carbonate, zinc carbonate, strontium carbonate, when used in combination with the phosphorus compound, particularly ammonium polyphosphate, Since the temperature of the decarboxylation reaction is reduced, the formation of the expanded heat insulating layer is promoted. Furthermore, by using the said compound together, the change to the polyphosphoric acid type compound of a phosphorus compound is accelerated | stimulated, and the effect which further improves the intensity | strength of an expansion | swelling heat insulation layer is exhibited. In particular, the combined use of ammonium polyphosphate and calcium carbonate is preferable because both of the above effects are most exhibited.

  In the resin composition constituting the thermally expandable refractory material, the amount of the thermally expandable inorganic material is preferably 10 to 300 parts by weight with respect to 100 parts by weight of the resin component. If the blending amount is less than 10 parts by weight, the thermal expansion performance is low because the volume expansion coefficient is low and heat insulation to the incombustible material constituting the fireproof board is not sufficiently performed, and if it exceeds 300 parts by weight, the mechanical strength greatly decreases. Unusable for use. More preferably, it is 20-250 weight part. In the resin composition, the blending amount of the inorganic filler is preferably 30 to 400 parts by weight with respect to 100 parts by weight of the resin component. If the blending amount is less than 30 parts by weight, sufficient fire resistance cannot be obtained with a decrease in heat capacity, and if it exceeds 400 parts by weight, the mechanical strength is greatly decreased and it cannot be used. More preferably, it is 40-350 weight part.

  In a resin composition, when adding a phosphorus compound, the compounding quantity of a phosphorus compound is 30-300 weight part with respect to 100 weight part of resin components. When the blending amount is less than 30 parts by weight, the effect of improving the strength of the expanded heat insulating layer is not sufficient, and when it exceeds 300 parts by weight, the mechanical strength is greatly lowered and cannot be used. More preferably, it is 40-250 weight part.

  The total amount of the thermally expandable inorganic substance and the inorganic filler is preferably 40 to 500 parts by weight with respect to 100 parts by weight of the resin component. When the total amount is less than 40 parts by weight, a sufficient expanded heat insulating layer cannot be obtained. When the total amount exceeds 500 parts by weight, the mechanical strength is greatly reduced and cannot be used. More preferably, it is 70-400 weight part.

  Furthermore, when adding a phosphorus compound, 70-500 weight part is preferable with respect to 100 weight part of resin components for the total amount of a phosphorus compound, a thermally expansible inorganic substance, and an inorganic filler. When the total amount is less than 70 parts by weight, a sufficient expanded heat insulating layer cannot be obtained, and when the total amount exceeds 500 parts by weight, the mechanical strength is greatly reduced and cannot be used. More preferably, it is 100-400 weight part.

  In addition, the resin composition has a phenolic, amine-based, sulfur-based antioxidant, metal harm-preventing agent, antistatic agent, stabilizer, cross-linking agent, lubricant, softener as long as its physical properties are not impaired. A pigment or the like may be added. Moreover, a general flame retardant may be added and fire resistance performance can be improved by the combustion suppression effect by a flame retardant.

  The molded body of the resin composition constituting the heat-expandable refractory material is prepared by preparing a kneaded product of the above-mentioned resin composition, and then molding the sheet-shaped or roll-shaped molded body, followed by cutting. A width expansion sheet can be obtained. Further, a method of adding a solvent at the time of kneading and then volatilizing the solvent after molding may be used.

  In the case of a kneaded product of the resin composition, each of the above-mentioned components is an extruder, a hanbury mixer, a kneader mixer, a kneading roll, etc., and in the case of a thermosetting resin such as an epoxy resin, a reika machine, a planetary stirring machine, etc. It can be obtained by using a known kneading apparatus. In the case of a two-component thermosetting resin, particularly an epoxy resin, a kneaded mixture of each of the two components and the filler is prepared separately by the kneading method, and is used with a plunger pump, a snake pump, a gear pump, etc. Each kneaded product may be supplied and mixed with a static mixer, a dynamic mixer or the like to produce a kneaded product.

  As a molding method of the resin composition, the kneaded material can be molded using a known method such as press molding, calender molding, extrusion molding, injection molding, or the like. In addition, as a method for molding a two-component thermosetting resin, particularly an epoxy resin, a known method may be used depending on the shape as appropriate, such as roll molding with SMC (Sheet Molding Compound) or the like, or coater molding with a roll coater or blade coater. Can be used.

  The curing method of the thermosetting resin, particularly the epoxy resin, is not particularly limited, and it is heated in the press or roll, or a heating furnace in the molding line, etc., or a molding and curing method is continuously performed, or it is put into a heating furnace after molding. It can carry out by well-known methods, such as a method to do. Moreover, when shape | molding using a solvent, a solvent can be volatilized by the method similar to the above.

  As a method of cutting the sheet-shaped or roll-shaped molded body formed by the above-described forming method into a predetermined width, a known method such as cutting, slitting, or ring cutting can be used. As for the thickness in case the molded object of a resin composition is a sheet form, 0.1-3 mm is preferable. When the thickness is less than 0.1 mm, the thickness of the expanded heat insulating layer formed by heating becomes thin, and sufficient fire resistance performance cannot be exhibited. Moreover, when it exceeds 3 mm, it cannot curve freely and adhesiveness with the incombustible material used as a foundation | substrate will fall. More preferably, it is 0.3-2 mm.

  In the resin composition, a net or a mat made of a noncombustible fibrous material may be laminated in order to further improve the strength of the expanded heat insulating layer. The net or mat made of non-combustible fibrous material is preferably made of inorganic fiber or metal fibrous material. For example, glass fiber woven fabric (glass cloth, roving cloth, continuous strand mat, etc.) or non-woven fabric ( A chopped strand mat or the like), a ceramic fiber woven fabric (ceramic cloth or the like) or a non-woven fabric (ceramic mat or the like), a carbon fiber woven or non-woven fabric, a net or a mat formed from a lath or a wire mesh is preferably used.

  Of these nets or mats, a glass fiber woven or non-woven fabric is preferred from the viewpoint of ease and cost when producing a heat-expandable refractory material. preferable. Furthermore, the glass cloth may be treated with a melamine resin, an acrylic resin, or the like because the handleability is improved and the adhesion with the resin is improved. In the case of a thermosetting resin, particularly an epoxy resin, the net or mat may be impregnated in the resin composition.

The net or mat made of non-combustible fibrous material has a weight per 1 m ² of 5 to 2000 g. When the weight per 1 m ² is less than 5 g, the effect of improving the shape retention of the expanded heat insulating layer is lowered, and when it exceeds 2000 g, the sheet becomes heavy and the construction becomes difficult. More preferably, it is 10-1000 g. The thickness of the net or mat made of this incombustible fibrous material is preferably 0.05 to 3 mm. When the thickness is 0.05 mm or less, the thermally expandable refractory material cannot withstand the expansion pressure when it expands. Moreover, when thickness exceeds 3 mm, it will become difficult to roll the sheet | seat of a thermally expansible refractory material. More preferably, it is 0.1-2 mm.

  In the case of a net made of a non-combustible fibrous material, the opening is preferably 0.1 to 50 mm. When the opening is less than 0.1 mm, the thermally expandable refractory material cannot withstand the expansion pressure when it expands. Moreover, when it exceeds 50 mm, the effect which improves the shape retainability of an expansion | swelling heat insulation layer will become low. More preferably, it is 0.2-30 mm. When the thermosetting resin composition is impregnated with a net or mat made of this non-combustible fibrous material, the net or mat may be located at any position in the thickness direction of the thermally expandable refractory material. In order to further enhance the shape retention of the layer, the surface side exposed to a flame is preferable.

  In the thermally expandable refractory material, a base material layer may be laminated on one side or both sides of the molded body of the resin composition for the purpose of improving workability and strength of the expanded layer. Examples of the material used for the base material layer include cloth, nonwoven fabric made of polyester, polypropylene, and the like, paper, plastic film, split cloth, glass cloth, aluminum glass cloth, aluminum foil, aluminum vapor deposition film, aluminum foil laminated paper, and And a laminate of these materials. Among these base material layers, an aluminum foil laminated paper and an aluminum glass cloth are preferable because the polyethylene laminated polyester nonwoven fabric works advantageously in fire resistance because it is easy to apply and apply a pressure-sensitive adhesive or an adhesive. The thickness of the base material layer may be any as long as it does not affect the fire resistance or construction, but is preferably 0.25 mm or less.

  Furthermore, the heat-expandable refractory material may be formed by laminating a laminate of a net or mat made of a non-combustible fibrous material and a base material layer on a sheet surface made of a resin composition. As a laminated body, the laminated body of an aluminum glass cloth or a poly film and a glass cloth etc. are mentioned, for example. Examples of the method of laminating or impregnating a base layer or a net or mat made of a non-combustible fibrous material include a method of integrating at the stage of molding the resin composition.

  When applying adhesive or adhesive to heat-expandable refractory material in advance during application or construction and sticking it to the non-combustible material constituting the fire-resistant board, the adhesive or adhesive to be used is the resin of the synthetic resin member. Any one can be used as long as it adheres or adheres, and examples thereof include acrylic, epoxy, and rubber. In addition, when a base material having a pressure-sensitive adhesive or an adhesive layer is previously laminated on the molded body, it may be laminated at the time of molding, or a base material having a pressure-sensitive adhesive or an adhesive on both sides may be laminated on the molded body. .

  As described above, the heat-expandable refractory material has excellent fire resistance performance, so it is possible to reduce the heat-expandable material necessary to exhibit the fire resistance performance, making the fire-resistant board thinner, lighter and lower. Cost can be reduced. In addition, as described above, a board-like laminate can be easily manufactured using a known technique, and can be easily attached to and integrated with the surface of a non-combustible material serving as a base. It becomes possible to form.

  The construction of the refractory pillar according to this embodiment configured as described above will be described below. A unit building U is configured by arranging a plurality of steel-based building units each having a frame composed of beams and columns in the horizontal direction and the vertical direction. In the unit building U, a plurality of building units 1, 1... Are arranged in series, thereby forming a column concentrating portion where a plurality of steel pipe columns 5, 5. And the construction which makes this fireproof pillar 10 by covering this pillar gathering part with fireproof boards 15,15 ..., making fireproof structure is performed.

  The construction for making a fireproof structure by covering the outer periphery of the plurality of steel pipe columns 5, 5. .. Are fixed by welding or the like to the outer circumferences of the plurality of steel pipe columns 5, 5. Next, the fireproof board 15 is pressed against the fixed support 11, and a fixing tool such as a screw 18 is screwed in a state where a gap 12 is formed between the steel pipe column and the fireproof board, and the fireproof board 15 is inserted into the supports 11 and 11. To fix. When the screw 18 is screwed in, a fixed state is stabilized by sandwiching and fixing a long metal plate 19A instead of the washer 19. By sandwiching the fireproof boards 15, 15... Using the backing plate 19A, when the heated expansion sheet 17 is heated and expanded, the expanded heat insulating layer is difficult to peel off from the gypsum board 16 which is a non-combustible material, and the fireproof performance is stabilized. .

  In this way, the fire column 10 in which the plurality of steel pipe columns 5, 5... Are covered with the fire resistant boards 15, 15. The volume of the fireproof coating can be reduced. For this reason, in the unit building U, the overhang | projection to the room | chamber interior of the fireproof pillar 10 can be decreased, and an effective area can be increased. Moreover, in the event of a fire or the like, the heat expansion sheet 17 disposed on the surface of the fireproof board 15 expands to form an expansion heat insulation layer, and the heat transfer to the gypsum board 16 that is a noncombustible material is cut off. Sufficient fire resistance can be obtained with the fireproof board 15 having the configuration. Moreover, the fireproof pillar 10 can be made into a fireproof structure only by fixing the thin fireproof boards 15, 15 with screws 18 or the like to the supports 11, 11. Construction at the site is easy and excellent in safety, and it is possible to obtain a fireproof structure with little work variation.

  Moreover, the fireproof coating that covers the plurality of steel pipe columns 5, 5... Is constructed by a dry type that only fixes the fireproof board, so that complicated construction such as spraying rock wool is not required, and safe construction is possible. It becomes possible. Furthermore, the fireproof board 15 is made of a non-combustible material such as a plaster board 16 and a heat expansion sheet 17 which are laminated and integrated in advance. And compared with the specification which carries out a fireproof coating by ALC board or RC construction, it can be made cheaply and since it is lightweight, a construction load can be made low.

  Fire resistance evaluation was implemented with respect to the fireproof pillar 10 of this embodiment comprised in this way. The evaluation was conducted in accordance with the Building Materials Testing Center, the test work method manual, and the fireproof floor evaluation method. As a result, as shown in Table 1 below, it was confirmed that all the judgment criteria were passed. A fireproof board 15 in which a plaster board 16 of 9.5 mm or more and a heated expansion sheet 17 of 1 mm or more are laminated on each surface of the four pillars is arranged along the outer periphery of the steel pipe pillars 5, 5. Therefore, it is possible to improve the heat shielding properties against the pillars to be prevented, and to prevent a decrease in yield strength due to the heating of the pillars.

  Another embodiment of the present invention will be described in detail with reference to FIGS. FIG. 5 is a horizontal sectional view of another embodiment of the refractory column according to the present invention, and FIG. 6 is an enlarged sectional view of the support of FIG. This embodiment is different from the above-described embodiment in that the shape of the support for fixing the fireproof board is different and the shape of the fireproof board and the fixture for fixing the fireproof board to the support are different. Other substantially equivalent configurations are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIGS. 5 and 6, the fireproof board 15 </ b> A is formed of a gypsum board 16 formed from an incombustible material and a heating expansion sheet 17 </ b> A, and the heating expansion sheet 17 </ b> A has its extension 17 a covering the end face of the gypsum board 16. . Further, the support 11A has a shape in which one corner of a steel pipe having a square cross section is removed, and the two long sides 11a and 11a that are orthogonal to each other are continuous at right angles from the ends of these long sides. Short ends 11b and 11b are provided, and end portions of the short sides are welded to the steel pipe columns 5, 5.

  A countersunk screw 18A is used as a fixture for fixing the fireproof board 15A to the support 11A thus formed. When the countersunk screw 18A is screwed into the fireproof board 15A and the fireproof board is fixed to the steel pipe column 5, the screw head portion becomes flat with the surface of the fireproof board, and the cross is directly applied to the surface of the fireproof board as an interior material. Etc. can be affixed. Moreover, since this fireproof board 15A is covered with the extension part 17a of the heat expansion sheet to the end surface, fireproof performance improves compared with the said embodiment.

  The fireproof board 15A may be one in which one end face of the gypsum board 16 is covered and integrated with the extension portion 17a of the heating expansion sheet 17A, and the gypsum board and the heating expansion sheet are not integrated in advance, and the support After fixing the gypsum board 16 to 11A, the heating expansion sheet 17A may be attached and laminated.

  In the above-described embodiment, the building units 1, 1... Are connected in the horizontal direction, and the unit building U is connected in the vertical direction by stacking in three stories. Of course, the present invention can also be applied to the case of a single-story building that is not connected in the vertical direction. Moreover, although the space | gap between a fireproof board and a pillar showed the example of 5 mm, fireproof performance can be improved more by enlarging this space | gap.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, although the example of the gypsum board was shown as an incombustible material, it is not restricted to this, The incombustible material formed from other materials, such as a calcium silicate board, can also be used.

  Further, although the plurality of pillars are arranged adjacent to each other with a predetermined interval, the present invention can be applied even when the columns are arranged with no interval. Furthermore, although the structure which has a space | gap between several steel pipe pillars and the fireproof board which coat | covers these pillars was shown, the fireproof board and the steel pipe pillar were closely_contact | adhered in the state without a space | gap, and a fireproof pillar was formed. Also good.

  As an application example of the present invention, this fireproof column can be used for general steel-framed prefabricated houses that are not unit buildings that combine building units.

The perspective view of the building unit which comprises the fireproof pillar which concerns on this invention. The elevation view which shows roughly the three-story unit building comprised by stacking several building units horizontally and stacking perpendicularly | vertically. The horizontal sectional view seen from the AA arrow direction of FIG. The horizontal sectional view which expands and shows the column gathering part B of FIG. The horizontal sectional view which shows other embodiment of the support which fixes a fireproof board. The expanded sectional view which shows the support of FIG. The horizontal sectional view which shows the principal part structure of the conventional fireproof pillar.

Explanation of symbols

  1: building unit, 5: steel pipe pillar (plural pillars), 10: fireproof pillar, 11: support, 12: air gap, 15: fireproof board, 15A: fireproof board, 16: gypsum board (noncombustible material), 17: heating Expansion sheet (thermal expansion fireproof sheet), 17A: heating expansion sheet, 17a: extension of heating expansion sheet, 18: screw, 18A: flat head screw, 19: washer, 19A: backing plate, U: unit building

Claims (9)

A plurality of columns are arranged adjacent to each other, a fireproof board in which a non-combustible material and a thermally expandable fireproof sheet are laminated is disposed along the outer periphery of the plurality of columns, and the plurality of columns are covered with the fireproof board ,
The fireproof board disposed along the outer periphery of the plurality of pillars is disposed such that the thermally expandable fireproof sheet is a surface,
A support is fixed to the plurality of pillars, a gap is formed between the fireproof board and the plurality of pillars via the fixed support, and a metal plate receiving plate is disposed on the outer peripheral surface of the fireproof board. The fireproof board, wherein the fireproof board is fixed to the plurality of pillars by a fixture with the support plate sandwiching the fireproof board . The refractory pillar according to claim 1, wherein the backing plate is a washer. The refractory column according to claim 1, wherein the receiving plate is a long metal plate material. The refractory board according to any one of claims 1 to 3, wherein the refractory board is formed by extending and covering a thermally expandable refractory sheet on an end face where the incombustible material is exposed. The support has a shape in which one corner of a steel pipe having a square cross section is removed, and two long sides that are orthogonal to each other, and a short side that is continuous at a right angle from the ends of these long sides. The fireproof pillar according to any one of claims 1 to 4, wherein the fireproof pillar is provided. The fireproof pillar according to any one of claims 1 to 5, wherein the non-combustible material is a gypsum board, and the thermally expandable fireproof sheet is adhesively supported on an outer peripheral surface of the gypsum board. The thermally expandable refractory sheet has a volume expansion coefficient of 3 to 50 times after heating for 30 minutes under a heating condition of 50 kW / m ² , and a 0.25 cm ² indenter is used in a compression tester. The refractory column according to any one of claims 1 to 6 , which is formed of a material having a measured breaking point stress after volume expansion of 0.05 kgf / cm ² or more. The thermally expandable refractory sheet contains 10 to 300 parts by weight of a thermally expandable inorganic material and 30 to 400 parts by weight of an inorganic filler with respect to 100 parts by weight of a resin component. refractory column according to any one of claims 1 to 7, characterized in that formed on the total amount of material of the resin composition containing 40 to 500 parts by weight. A unit building using the refractory column according to any one of claims 1 to 8 .

Images