Method for constructing fireproof covering material, fireproof structure, and fixing structure

Abstract

To provide a construction method for a fire-resistant covering material, which is high in safety, and which enables the fire-resistant covering material to be easily constructed by a method requiring no skill, without causing trouble such as the damage of the fire-resistant covering material.SOLUTION: A method for constructing a fire-resistant covering material includes a bonding step of bonding a fixing member 14 to a steel frame 11 or an installation surface 12 installed on the steel frame 11 with an adhesive, a winding step of winding the fire-resistant covering material 13 around the steel frame 11, and a fixing step of fixing the fire-resistant covering material 13 with the fixing member 14 bonded with the adhesive.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for applying a fire-resistant covering material to a steel frame, a fire-resistant structure including a steel frame and a fire-resistant covering material, and a fixing structure for attaching the fire-resistant covering material to a steel frame or an installation surface. [Background technology]

[0002] When structures such as buildings and civil engineering structures are exposed to high temperatures due to fire or other causes, the steel frames that make up the columns, beams, etc. soften and buckle, causing the structure to collapse. For this reason, steel frames have traditionally been covered with sheet-like fire-resistant coating materials. Fire-resistant coating materials prevent the collapse of structures by delaying the temperature rise of the steel frames during a fire and suppressing the softening of the steel frames during a fire.

[0003] It is known that a fire-resistant covering material is wrapped around a steel frame and its ends are fixed to the steel frame or a floor material installed on the steel frame with fixing members, thereby covering the steel frame. Conventionally, a welding pin has been widely used as a fixing member for the fire-resistant covering material. When a welding pin is used, as described in Patent Document 1, for example, the fixing member can be fixed by piercing the welding pin into the fire-resistant covering material and bringing the tip into contact with the steel frame, and then passing an electric current through the welding pin to melt both the tip of the welding pin and the steel frame.

[0004] Also known as fixing members are elongated plate-like members having a plurality of claws, as described in Patent Documents 2 and 3. In the fixing members described in Patent Documents 2 and 3, the elongated plate member is welded to a steel frame or a floor material installed on the steel frame, and the fire-resistant covering material is fixed to the steel frame or floor material by bending each of the claws that penetrate the fire-resistant covering material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2-308046 [Patent Document 2] Publication No. 3227105 [Patent Document 3] Publication No. 3227104 Summary of the Invention [Problem to be solved by the invention]

[0006] The conventional construction method of fixing the fire-resistant coating material using the above-mentioned welding pins or welding requires skill, and ordinary workers are often unable to handle it adequately. Meanwhile, in recent years, due to the aging of on-site workers and labor shortages, there has been a shortage of skilled workers, and construction delays due to waiting for the fire-resistant coating material to be installed are becoming more likely. In addition, the construction method using welding pins leaves room for improvement in terms of safety, as arcs may be generated, and furthermore, problems such as the fire-resistant coating material melting may occur.

[0007] Therefore, an object of the present invention is to provide a method for installing a fire-resistant covering material, a fire-resistant structure, and a fixing structure that are highly safe, can be installed easily using a method that does not require skill, and does not cause problems such as damage to the fire-resistant covering material. [Means for solving the problem]

[0008] The gist of the present invention is as follows. [1] A method for installing a fire-resistant covering material to cover a steel frame, an adhering step of adhering a fixing member to the steel frame or an installation surface to be installed on the steel frame with an adhesive; a winding step of winding the fire-resistant covering material around the steel frame; a fixing step of fixing the fire-resistant covering material with the fixing member bonded by the adhesive; A method for installing fire-resistant coating materials. [2] The creep resistance load of the adhesive when heated at 600°C for 30 minutes and then at 800°C for 30 minutes is 0.8 mN / mm 2 The above is the method for applying the fire-resistant coating material described in [1] above. [3] The adhesive has a strength of 0.1 N / mm after heating at 800°C for 30 minutes. 2A method for applying the fire-resistant coating material described in [1] or [2] above, which has a strength of at least 10 ... [4] The method for applying a fire-resistant covering material according to any one of the above [1] to [3], wherein the adhesive is an adhesive containing an organic elastomer polymer as a main component. [5] The method for applying a fire-resistant coating material according to any one of the above [1] to [4], wherein the adhesive is an adhesive containing a silyl group-containing polymer. [6] The method for applying a fire-resistant coating material according to the above [5], wherein the silyl group-containing polymer is a polyoxyalkylene polymer. [7] The method for applying a fire-resistant coating material according to any one of the above [1] to [6], wherein the adhesive contains glass frit. [8] The method for applying a fire-resistant covering material according to any one of the above [1] to [7], wherein the fixing member is a fixing pin having a pin portion. [9] A method for installing a fire-resistant covering material as described in [8] above, in which the fire-resistant covering material is fixed by the fixing pin by piercing the fire-resistant covering material into the pin portion.

[10] A method for installing a fire-resistant covering material according to the above [9], wherein the pin portion that has pierced the fire-resistant covering material is bent or a restricting member is attached to the pin portion.

[11] A method for installing a fire-resistant coating material according to any one of [1] to

[10] above, wherein the fixing member has a flat surface and the flat surface is adhered to the steel frame or the installation surface via the adhesive.

[12] The method for applying a fire-resistant covering material according to any one of [1] to

[11] above, wherein the steel frame constitutes a column or a beam.

[13] Steel frame and a fire-resistant coating material wrapped around the steel frame; A fixing member that fixes the fire-resistant covering material to the steel frame or an installation surface to be installed on the steel frame; an adhesive layer that adheres the fixing member to the steel frame or the installation surface; A fire-resistant structure comprising:

[14] A fixing structure for fixing a fire-resistant covering material covering a steel frame to the steel frame or an installation surface installed on the steel frame, A fixing structure comprising: a fixing pin having a pin portion and a flat surface; and an adhesive layer laminated on the flat surface to adhere the fixing pin to the steel frame or the installation surface. [Effects of the Invention]

[0009] According to the present invention, a method for installing a fire-resistant covering material, a fire-resistant structure, and a fixing structure can be provided that are highly safe, can be easily installed using a method that does not require skill, and does not cause any problems such as damage to the fire-resistant covering material. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a fireproof structure according to a first embodiment of the present invention. [Figure 2] 1 is a cross-sectional view showing a fireproof structure according to a first embodiment of the present invention. [Figure 3] FIG. 10 is a perspective view showing an example of a fixing pin used as a fixing member. [Figure 4] 1 is a perspective view showing a method for applying a fire-resistant covering material according to a first embodiment of the present invention. [Figure 5] FIG. 4 is a cross-sectional view showing a fireproof structure according to a second embodiment of the present invention. [Figure 6] FIG. 4 is a front view showing a fireproof structure according to a second embodiment of the present invention. [Figure 7] FIG. 4 is a perspective view showing a method for applying a fire-resistant covering material according to a second embodiment of the present invention. [Figure 8] FIG. 4 is a cross-sectional view showing a fireproof structure according to a third embodiment of the present invention. [Figure 9] FIG. 10 is a front view showing a fireproof structure according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view showing a method for applying a fire-resistant covering material according to a third embodiment of the present invention. [Figure 11] FIG. 10 is a perspective view showing another example of a fixing pin used as a fixing member. [Figure 12] FIG. 10 is a perspective view showing a method for creep load resistance. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First Embodiment 1 and 2 show a fireproof structure according to a first embodiment of this invention. Note that the first embodiment will be described with reference to an example in which the installation surface is the top surface and the steel frame is an H-shaped steel beam. A fireproof structure 10 according to the first embodiment includes a steel frame 11, an installation surface 12 installed on the steel frame, a fireproof covering material 13 that covers the steel frame 11, a fixing member 14 that fixes the fireproof covering material 13 to the installation surface 12, and an adhesive layer 15 that bonds the fixing member 14 to the installation surface 12. In this embodiment, the fixing member 14 and the adhesive layer 15 constitute a fixing structure 30 that fixes the fireproof covering material 13 to the installation surface 12.

[0012] In this embodiment, the steel frame 11 is an H-shaped steel beam and has a plate-shaped web 11A and plate-shaped flanges 11B and 11C connected to both ends of the web 11A. The installation surface 12 is the top surface and may be formed of a flat material 18 such as a flooring, roofing, or ceiling material. In this embodiment, the steel frame 11 may form a beam in a building or civil engineering structure. The flooring, roofing, or ceiling material may be any known material that is installed on a steel frame, such as concrete, cement board, ALC (lightweight aerated concrete), or a deck plate. The deck plate may preferably have a galvanized steel plate surface. In this embodiment, the installation surface 12 is formed of the underside of a flat material 18 such as a flooring, roofing, or ceiling material. The flat material 18 is disposed above the steel frame 11, and the underside (installation surface 12) of the flat material 18 contacts the upper surface of one flange 11B of the steel frame 11.

[0013] The fire-resistant covering material 13 covers the steel frame 11 and can delay the temperature rise of the steel frame 11 in the event of a fire, and may be in the form of a sheet or a mat, for example. Examples of the fire-resistant covering material 13 include an inorganic fire-resistant sheet and a thermally expandable sheet. Examples of inorganic fire-resistant sheets include inorganic fiber mats such as rock wool mats based on rock wool, glass wool mats based on glass wool, and ceramic wool mats based on ceramic wool. Commercially available inorganic fiber mats include "Makibee" from Nichias Corporation and "Rock Cover" from A&A Material Co., Ltd.

[0014] Thermally expandable sheets expand upon heating to form a heat-insulating layer and suppress temperature increases during fires. Examples of such sheets include those containing thermally expandable layered inorganic materials such as vermiculite and thermally expandable graphite, preferably thermally expandable graphite. The thermally expandable sheet preferably has a thermally expandable layer made of a thermally expandable composition in which a resin or elastomer is used as a matrix component and thermally expandable graphite is dispersed within the matrix component. The thermally expandable composition may further contain an inorganic filler, a flame retardant, or the like. Furthermore, the thermally expandable sheet may be a laminate comprising a substrate made of a metal foil, glass fiber, inorganic fiber, or a composite of these materials in addition to the thermally expandable layer, and the substrate and the thermally expandable layer are laminated together. Commercially available thermally expandable sheets include "Fi-Block" from Sekisui Chemical Co., Ltd. The thickness of the fire-resistant coating material 13 is not particularly limited, but is, for example, approximately 0.1 to 100 mm, preferably approximately 0.2 to 70 mm, and more preferably approximately 0.5 to 5 mm.

[0015] The fire-resistant covering material 13 is wrapped around the steel frame 11 to cover the steel frame 11. In this embodiment, the fire-resistant covering material 13 is wrapped around the steel frame 11 so as to cover the steel frame 11 except for the portion of the steel frame 11 that contacts the installation surface 12 (i.e., the upper surface of the flange 11B). Specifically, the fire-resistant covering material 13 is arranged along the surface of the steel frame 11 opposite the portion that contacts the installation surface 12 (i.e., the lower surface of the flange 11C), and covers both the left and right sides of the steel frame 11 in the axial direction. Furthermore, both end portions 13A and 13B of the fire-resistant covering material 13 are arranged on the installation surface 12. The both end portions 13A and 13B on the installation surface 12 are fixed to the installation surface 12 by fixing members 14. The both end portions 13A and 13B are both end portions in the width direction of the steel frame 11 (i.e., the direction perpendicular to the axial direction of the steel frame 11).

[0016] As shown in Fig. 1, the fire-resistant covering material 13 has a fixed length in the axial direction of the steel frame 11, and both end portions 13A, 13B also have fixed lengths in the axial direction of the steel frame 11. Both end portions 13A, 13B are fixed to the installation surface 12 by a plurality of fixing members 14 arranged along the axial direction of the steel frame 11. The plurality of fixing members 14 should be arranged at equal intervals. The fixing members 14 should be arranged at intervals such that no gaps are formed between the installation surface 12 and the fire-resistant covering material 13.

[0017] In this embodiment, the fixing member 14 is a fixing pin having a pin portion. Specifically, as shown in FIG. 3, the fixing pin preferably has a plate-shaped flat portion 21 and a pin portion 22 connected to the back surface 21B of the flat portion 21. The pin portion 22 is not particularly limited as long as it can pierce the fire-resistant covering material 13 with its tip, but preferably has a thin, needle-like shape with a pointed tip as shown in FIG. 3. The fixing pin is preferably made of metal. Furthermore, the fixing pin is preferably heat-resistant and fire-resistant, and preferably has a melting point of 1,000°C or higher. The fixing pin may have a heat-resistant and fire-resistant protective film on its surface. The length of the pin portion 22 may be greater than the thickness of the fire-resistant covering material 13, and is, for example, about 5 to 250 mm, and preferably about 10 to 150 mm. The pin portion 22 of the fixing member 14 is thrust into the fire-resistant covering material 13, and the pin portion 22 penetrates the fire-resistant covering material 13. The tip portion of the pin portion 22 that penetrates the fire-resistant covering material 13 is bent as shown in Figures 1 and 2, and the fire-resistant covering material 13 is sandwiched between the bent portion and the flat portion 21, thereby fixing the fire-resistant covering material 13 and preventing it from falling off the pin portion 22.

[0018] The surface 21A of the flat portion 21 is a flat surface, and as shown in Fig. 2, an adhesive layer 15 is formed on the flat surface, and the fixing member 14 is adhered to the installation surface 12 via the adhesive layer 15. The shape of the flat portion 21 is not particularly limited, and may be circular as shown in Fig. 3, or a shape other than circular, such as an ellipse, a square, a polygon such as a triangle, or any other shape. The size of the flat surface portion 21 is, for example, about 10 to 150 mm, and preferably about 15 to 100 mm. Note that the size of the flat surface portion 21 means the diameter if it is circular, and the maximum diameter if it is a shape other than circular. Specific examples of fixing pins that can be used include "spindle rivets" and "AT pins" manufactured by Tilement Co., Ltd., and "Maki pins" manufactured by Sanko Techno Co., Ltd.

[0019] (adhesive) The adhesive layer 15 is preferably composed of an adhesive. The adhesive is not particularly limited as long as it can adhere the fixing pin 14 to the installation surface, and various adhesives can be used. The type of adhesive is not particularly limited, and may be a solvent-volatile adhesive or a curing adhesive, with a curing adhesive being preferred. A curing adhesive can easily ensure high adhesion in a high-temperature environment. The curing adhesive may be a one-component curing type or a two-component curing type that cures by mixing two components. The curing adhesive may be a moisture-curing adhesive or a heat-curing adhesive, with a moisture-curing adhesive being preferred. A moisture-curing adhesive cures by leaving it in an atmospheric environment, so it can cure without the need for a special adhesive curing device, improving workability. A moisture-curing adhesive also increases adhesive strength after curing. A coating adhesive is preferred, which is applied, dried as needed, and solidified or cured to form the adhesive layer 15. The adhesive may also be a pressure-sensitive adhesive. The adhesive layer 15 may be composed of an adhesive tape. In this specification, materials capable of constituting the adhesive layer 15, such as adhesive tape and adhesives, are collectively referred to as "adhesive material." The adhesive tape may be a substrate-less double-sided adhesive tape consisting of a single adhesive layer without a substrate, or may be a double-sided adhesive tape having a substrate and adhesive layers on both sides of the substrate. The adhesive layer may be formed from a known adhesive.

[0020] It is preferable to use a fire-resistant adhesive as the adhesive. The fire-resistant adhesive is an adhesive that has fire resistance and maintains a certain strength even after being heated at high temperatures for a certain period of time. Specifically, the adhesive has a strength of 0.1 N / mm after being heated at 800°C for 30 minutes. 2 It is preferable that the resistance is 0.5N / mm or more. 2 More preferably, 1.0N / mm 2 More preferably, 2.0N / mm 2 The upper limit of the strength after heating at 800°C for 30 minutes is not particularly limited, and the higher the better. 2The method for measuring the strength after heating at 800°C for 30 minutes is as follows.

[0021] A test specimen is obtained by forming an adhesive layer of a certain thickness on a zinc-coated steel plate, and the resulting test specimen is left in a thermostatic chamber at 800°C for 30 minutes to burn, after which it is removed from the chamber and left in an atmosphere of 23°C and 50% relative humidity for 3 hours to generate a combustion residue. Next, the combustion residue is compressed with a 1.5 mm diameter needle using a universal testing machine at a compression speed of 50 mm / min to measure the coating strength of the combustion residue, and the obtained coating strength is taken as the strength after heating at 800°C for 30 minutes. For example, if the adhesive is a spread-type adhesive, the test specimen is prepared by applying the adhesive to a zinc-coated steel plate to a thickness of 10 mm, width of 10 mm, and length of 50 mm, and then curing the adhesive for one month at 23°C and 50% relative humidity to obtain a test specimen. However, if the adhesive is a thermosetting type that does not harden or solidify at 23°C and 50% relative humidity, the test specimen is obtained by curing the adhesive according to the type of adhesive (for example, by heating in the case of a thermosetting type) and then curing the adhesive for one month at 23°C and 50% relative humidity. If the adhesive is adhesive tape, the tape can be applied to the zinc-coated steel plate and then cured for one month at 23°C and 50% relative humidity to obtain a test specimen.

[0022] The adhesive preferably has a creep load resistance of at least a certain level when heated at high temperatures. Specifically, the adhesive preferably has a creep load resistance of at least 0.8 mN / mm when heated at 600°C for 30 minutes and then at 800°C for 30 minutes. 2 It is preferable that the creep load resistance is 0.8 mN / mm or more. 2 If the adhesive layer 15 has a creep resistance of 1 mN / mm, the fire-resistant covering material 13 can be supported by the adhesive (adhesive layer 15) even when heated to a high temperature, and problems such as the fire-resistant covering material 13 falling off in the event of a fire can be prevented. 2 More preferably, it is 5 mN / mm or more. 2 It is preferable that the resistance is 14 mN / mm or more. 2The upper limit of the creep load resistance is not particularly limited, and the higher the better. 2 is. In order to further improve the fire resistance and prevent the fire-resistant coating material 13 from falling in the event of a fire, it is more preferable that the adhesive have a creep resistance load equal to or greater than the above-mentioned lower limit value, and that the strength after heating at 800°C for 30 minutes (i.e., the combustion residue) be equal to or greater than the above-mentioned lower limit value.

[0023] The creep load resistance measurement method will be described with reference to FIG. 12. First, a support plate 40 made of ALC and a slate plate 41 (e.g., 10 mm × 10 mm) are prepared. Plate 41 is provided with a weight ring 47 on one surface. An adhesive is applied to the entire other surface of plate 41, and the adhesive-coated surface is pressed against one side of support plate 40 to solidify or harden the adhesive, bonding plate 41 to support plate 40 via a 1 mm-thick adhesive layer 42 (e.g., 10 mm × 10 mm). The solidification or hardening of the adhesive can be performed as appropriate depending on the type of adhesive. For example, in the case of a moisture-curing adhesive, it can be performed by leaving the plate in an environment of 23°C and 50% relative humidity for 7 days. Alternatively, if the adhesive is adhesive tape, instead of applying adhesive, adhesive tape can be applied to the entire other surface of plate 41, and plate 41 can be bonded to support plate 40 using the adhesive tape. Next, as shown in FIG. 12 , the support plate 40, to which the plate 41 is bonded via the adhesive layer 42, is placed between two stands 43 and 44 with the plate 41 facing downward, and a weight 45 is hung from the weight ring of the plate 41. The plate is then placed in an electric furnace and heated from room temperature to 600°C at a heating rate of 15°C / min. After being left at 600°C for 30 minutes, the plate is further heated to 800°C at a heating rate of 15°C / min and left at 800°C for 30 minutes. If the weight 45 does not fall off when heated under these heating conditions, the adhesive (adhesive or adhesive tape) is deemed to have a creep load resistance equal to or greater than the load applied to the adhesive layer 42 by the weight 45 and the plate 41. Note that Clion Panel manufactured by Clion Co., Ltd. can be used as the ALC, and Flexible Sheet N manufactured by Nozawa Co., Ltd. can be used as the slate.

[0024] Adhesives that can be used as fire-resistant adhesives include inorganic fire-resistant adhesives, organic fire-resistant adhesives, and organic-inorganic hybrid fire-resistant adhesives. Inorganic fire-resistant adhesives use inorganic materials as adhesive components, such as water glass, gypsum, silicate, calcium carbonate, and clay. Other examples include those primarily composed of fire-resistant ceramics such as alumina and inorganic polymers. Furthermore, silicate-based adhesives include those that use sodium silicate inorganic binders as the main ingredient to which heat-resistant inorganic fillers are added. Inorganic fire-resistant adhesives have good fire resistance because the adhesive itself is non-flammable or flame-retardant. Commercially available inorganic fire-resistant adhesives may be used, such as "Kilbond GW," "AK Coat," and "AS Bond" manufactured by A&A Materials, "Tiger GL Bond" manufactured by Yoshino Gypsum, and "Aron Ceramic" manufactured by Toa Gosei.

[0025] The adhesive is also preferably an adhesive containing glass frit (glass powder). By containing glass frit, the adhesive is more likely to have improved fire resistance. The adhesive containing glass frit is preferably an organic adhesive that uses an organic material as an adhesive component. The adhesive containing glass frit may also be an adhesive tape. In the case of an adhesive tape, the adhesive constituting the adhesive layer preferably contains glass frit.

[0026] The adhesive is preferably an adhesive containing an organic elastomer polymer as the main component, which makes it easier to improve adhesive strength, especially adhesive strength after high-temperature heating.

[0027] The adhesive containing glass frit will be described in detail below, taking as an example an adhesive containing an organic elastic polymer as a main component. Specific examples of organic elastomer polymers used in adhesives include rubber-based polymers such as ethylene-propylene rubber (EPM), natural rubber, isoprene rubber, butadiene rubber, butyl rubber, styrene-butadiene rubber, styrene-isoprene rubber, styrene-isoprene-butadiene rubber, acrylonitrile-butadiene rubber, and ethylene-vinyl acetate copolymers, as well as silyl group-containing polymers. The polymer may be the main component of the adhesive. Specifically, the polymer content of the adhesive is 10% by mass or more, preferably 20% by mass or more, and more preferably 25% by mass or more, based on the total amount of the adhesive composition constituting the adhesive. The upper limit of the polymer content is not particularly limited, and may be, for example, 95% by mass or less, 80% by mass or less, or 70% by mass or less. When a volatile component such as an organic solvent is contained, the amount of organic components in the adhesive composition is the amount based on the solid content excluding the volatile component.

[0028] (Silyl group-containing polymer) Among the polymers mentioned above, silyl group-containing polymers are preferred. By using a silyl group-containing polymer, the adhesive can be made moisture-curable, improving workability when applying a fire-resistant coating material. The silyl group in the silyl group-containing polymer is preferably a hydrolyzable silyl group. In the polymer containing a hydrolyzable silyl group, the hydrolyzable group of the hydrolyzable silyl group is hydrolyzed in the presence of water to generate a silanol group (—SiOH). Then, the silanol groups undergo dehydration condensation with each other to form a crosslinked structure, which can impart high adhesive strength.

[0029] The hydrolyzable silyl group is a group formed by bonding 1 to 3 hydrolyzable groups to a silicon atom. The hydrolyzable group of the hydrolyzable silyl group is not particularly limited, and examples thereof include a hydrogen atom, a halogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an acid amide group, an aminooxy group, a mercapto group, an alkenyloxy group, and an oxime group. Among the above, the hydrolyzable silyl group is preferably an alkoxysilyl group because of its mild hydrolysis reaction. Examples of the alkoxysilyl group include trialkoxysilyl groups such as trimethoxysilyl group, triethoxysilyl group, triisopropoxysilyl group, and triphenoxysilyl group, dialkoxysilyl groups such as propyldimethoxysilyl group, methyldimethoxysilyl group, and methyldiethoxysilyl group, and monoalkoxysilyl groups such as dimethylmethoxysilyl group and dimethylethoxysilyl group.

[0030] Examples of silyl group-containing polymers include polyalkylene oxide polymers, acrylic polymers, silicone resins, urethane resins, and polyolefin resins. These may all have a hydrolyzable silyl group. The silyl group-containing polymers may be used alone or in combination of two or more. Among these, polyalkylene oxide polymers are preferred as the silyl group-containing polymers. Use of polyalkylene oxide polymers facilitates improved adhesive strength. The hydrolyzable silyl group contained in the polyalkylene oxide polymer is preferably an alkoxysilyl group, more preferably a dialkoxysilyl group, and more preferably a dimethoxysilyl group.

[0031] The polyalkylene oxide polymer preferably has an average of 1 to 4 hydrolyzable silyl groups per molecule. When the number of hydrolyzable silyl groups in the polyalkylene oxide polymer is within the above range, the fixing member 13 is more easily held in place by the combustion residue of the adhesive even after combustion, making the fire-resistant covering material 13 less likely to fall off in the event of a fire. The polyalkylene oxide polymer preferably has a hydrolyzable silyl group at at least one of the two ends of its main chain. The average number of hydrolyzable silyl groups per molecule in the polyalkylene oxide polymer is 1 It can be calculated based on the concentration of hydrolyzable silyl groups in the polyalkylene oxide polymer determined by H-NMR and the number average molecular weight of the polyalkylene oxide determined by GPC.

[0032] The polyalkylene oxide constituting the polyalkylene oxide polymer has a main chain represented by the general formula: -(RO) n - (wherein R represents an alkylene group having 1 to 14 carbon atoms, and n represents the number of repeating units and is a positive integer.) The main chain skeleton of the polyalkylene oxide may be composed of only one type of repeating unit, or may be composed of two or more types of repeating units. Examples of the main chain skeleton of the polyalkylene oxide include polyethylene oxide, polypropylene oxide, polybutylene oxide, polytetramethylene oxide, polyethylene oxide-polypropylene oxide copolymer, and polypropylene oxide-polybutylene oxide copolymer. Among these, polypropylene oxide is preferred. Polypropylene oxide can impart excellent rubber elasticity and adhesiveness to the adhesive layer.

[0033] The number average molecular weight of the polyalkylene oxide polymer is preferably 3,000 to 50,000, more preferably 10,000 to 30,000. When the number average molecular weight of the polyalkylene oxide is 3,000 or more, the mechanical strength or elongation of the adhesive layer is improved. When the number average molecular weight of the polyalkylene oxide is 50,000 or less, the coatability of the adhesive is improved. The number average molecular weight of the polyalkylene oxide polymer refers to a value measured by gel permeation chromatography (GPC) in terms of polystyrene. Measurement by GPC can be performed using, for example, a Tosoh Shodex KF800D GPC column and chloroform or the like as a solvent.

[0034] Commercially available polyalkylene oxide polymers can be used. Examples include those manufactured by Kaneka Corporation under the trade names "MS Polymer S-203," "MS Polymer S-303," "Silyl Polymer SAT-200," "Silyl Polymer SAT-350," "Silyl Polymer SAT-400," "HS-2," and "SAX720." Other examples include those manufactured by Asahi Glass Company under the trade names "Excestar ESS-3620," "Excestar ESS-2420," "Excestar ESS2410," and "Excestar ESS3430."

[0035] (glass frit) The adhesive composition constituting the adhesive contains glass frit (glass powder) in addition to the polymer described above. The glass frit softens or melts when heated at high temperatures and acts as a binder. This facilitates increasing the creep load resistance and strength of the adhesive composition when heated at high temperatures, and improves fire resistance. Examples of glasses constituting the glass frit include phosphate-based glass, borate-based glass, bismuth oxide-based glass, silicate-based glass, and sodium oxide-based glass. Among these, phosphate-based glass and borate-based glass are preferred, with phosphate-based glass being more preferred. The glass frit can be obtained by adjusting B2O3, PO5, ZnO, SiO2, Bi2O3, Al2O3, BaO, CaO, MgO, MnO2, ZrO2, TiO2, CeO2, SrO, VO5, SnO2, Li2O, Na2O, KO, CuO, Fe2O3, and the like in predetermined component ratios. The glass frit may be used alone or in combination of two or more kinds.

[0036] The softening point of the glass constituting the glass frit is preferably 350 to 650° C., more preferably 360 to 560° C., particularly preferably 370 to 540° C., and most preferably 380 to 520° C. The softening point of the glass constituting the glass frit is the temperature at which the viscosity of the glass becomes 107.6 dPa s (logη=7.6). The content of the glass frit in the adhesive composition is preferably 2 to 120 parts by mass, more preferably 5 to 100 parts by mass, more preferably 8 to 90 parts by mass, more preferably 25 to 90 parts by mass, more preferably 25 to 70 parts by mass, and particularly preferably 30 to 60 parts by mass, relative to 100 parts by mass of the polymer. When the content of the glass frit is within the above range, the adhesive composition has excellent coatability and can impart excellent rubber elasticity, coating strength, and fire resistance to the adhesive layer.

[0037] (mineral) The adhesive composition preferably further contains a mineral. When the adhesive composition further contains a mineral, the strength after heating is improved, and fire resistance can be further improved. The mineral is preferably a mineral having a Mohs hardness of 5 or more. Examples of minerals include feldspar, iron oxide, titanium oxide, silica (SiO2), quartz, α-alumina, silicon carbide, and boron carbide. Feldspar, titanium oxide, and α-alumina are preferred, feldspar and α-alumina are more preferred, and feldspar is particularly preferred. The minerals may be used alone or in combination of two or more. The Mohs hardness of a mineral is measured as follows: Ten standard minerals with different hardness levels [standard minerals with Mohs hardness values ​​between 1 and 10 (integer)] are prepared. The standard minerals with lower Mohs hardness are rubbed against the surface of the mineral to be measured in order. Of the standard minerals that did not scratch the surface of the mineral to be measured, the Mohs hardness of the standard mineral with the highest Mohs hardness is taken as the Mohs hardness of the mineral.

[0038] Feldspars used as minerals include, for example, alkali feldspars such as orthoclase, sanidine, microcline, and anorthoclase; and plagioclases such as albite, oligoclase, andesine, albite, anorthite, and anorthite. Examples of feldspars include nephelines such as kalsilite and cancrinite, nepheline syenite, leucite, sodalite, hauyne, lazurite, nosean, and melilite, with nepheline syenite being preferred. Note that nepheline syenite is sometimes referred to as syenite.

[0039] The average particle size of the mineral is, for example, 0.01 to 100 μm, preferably 0.1 to 50 μm, more preferably 1 to 25 μm, particularly preferably 2 to 15 μm, and particularly preferably 3 to 10 μm. When the average particle size of the mineral is 0.01 μm or more, the adhesive strength after heating can be easily increased. Furthermore, when the average particle size of the mineral is 100 μm or less, the mineral can be uniformly dispersed in the adhesive composition, and the adhesive strength after heating can be easily increased. The average particle size of a mineral is a value measured by image analysis using a transmission electron microscope. Specifically, a magnified photograph of the mineral is taken using a transmission electron microscope at 100x magnification, 50 minerals are randomly selected, the diameter of each mineral is measured, and the arithmetic mean of the diameters of each mineral is taken as the average particle size of the mineral. The diameter of a mineral is the diameter of the smallest circle that can surround the mineral.

[0040] The content of the mineral in the adhesive composition is preferably 1 to 800 parts by mass, more preferably 30 to 600 parts by mass, more preferably 50 to 450 parts by mass, particularly preferably 80 to 300 parts by mass, and most preferably 120 to 200 parts by mass, per 100 parts by mass of the polymer. When the content of the mineral is within the above range, the adhesive has high strength after heating and excellent fire resistance, making it easier to maintain a stable bonded state of the fixing members even in the event of a fire.

[0041] (plasticizer) The adhesive composition may contain a plasticizer. Examples of plasticizers include phthalate esters such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diisobutyl phthalate, di-n-hexyl phthalate, bis(2-ethylhexyl) phthalate, di-n-octyl phthalate, diisononyl phthalate, dinonyl phthalate, diisodecyl phthalate, diisoundecyl phthalate, and bisbutylbenzyl phthalate; and polyalkylene glycols such as diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, and polypropylene glycol. Among these, polyalkylene glycols are preferred, and polypropylene glycol is more preferred. The content of the plasticizer in the adhesive composition is preferably 1 to 50 parts by mass, more preferably 10 to 40 parts by mass, per 100 parts by mass of the polymer.

[0042] (Other additives) In addition to the above, the adhesive composition may contain other additives such as a curing catalyst such as a silanol condensation catalyst, a thixotropic agent, an antioxidant, an ultraviolet absorber, a pigment, a dye, an anti-settling agent, an aminosilane coupling agent, a thixotropic agent, a light stabilizer, etc. The adhesive composition may also contain an organic solvent and be diluted with the organic solvent.

[0043] The adhesive composed of the adhesive composition can be produced by mixing a polymer and glass frit, and further, if necessary, minerals, expansion agents, plasticizers, and other additives.

[0044] [Fireproof coating construction method] Next, with reference to FIG. 4, a construction method for applying a fire-resistant covering material to a steel frame to obtain the above-mentioned fire-resistant structure will be described in detail. The construction method according to this embodiment includes an adhesive step of adhering fixing members 14 to a mounting surface 12 to be installed on a steel frame 11 with an adhesive, a wrapping step of wrapping fire-resistant covering material 13 around the steel frame 11, and a fixing step of fixing the fire-resistant covering material 13 with fixing members 14 adhered with an adhesive (adhesive layer 15). The construction method according to this embodiment will be described in detail below.

[0045] In the construction method of this embodiment, first, a steel frame 11 on which an installation surface 12 is installed, fixing pins as fixing members 14, and fire-resistant covering material 13 are prepared. Then, in the bonding step, as shown in FIG. 4(A), the fixing members 14 are bonded to the installation surface 12 using adhesive 15. Here, it is preferable that a plurality of fixing members 14 are arranged at equal intervals along the axial direction of the steel frame 11, at a certain distance from the steel frame 11, on each side of the steel frame 11. More specifically, adhesive may be applied to surface 21A (flat surface) of fixing member 14, and the flat surface with the adhesive applied may be pressed against installation surface 12 to adhere the flat surface (fixing member 14) to installation surface 12. Alternatively, adhesive may be applied to the installation surface 12 at a position where fixing member 14 will be placed, and fixing member 14 may be pressed against the applied position to adhere fixing member 14 to installation surface 12. Furthermore, when using adhesive tape as the adhesive material as described above, instead of applying adhesive, it is preferable to attach the adhesive tape to the surface 21A (flat surface) or the installation surface 12 and similarly adhere the fixing member 14 to the installation surface 12.

[0046] If the adhesive is a curing adhesive, it is preferable to press the fixing member 14 against the installation surface 12 and then cure the adhesive to bond the fixing member 14 to the installation surface 12. For example, in the case of a moisture-curing adhesive, it is preferable to press the fixing member 14 against the installation surface 12 to temporarily fix it, and then leave it in the atmosphere in this temporarily fixed state for a predetermined period of time to cure it. Note that curing adhesives such as moisture-curing adhesives have a certain level of viscosity or higher before hardening, and it is preferable to temporarily fix them using that viscosity.

[0047] Next, as shown in FIG. 4(B), a winding step and a fixing step are carried out, in which the fire-resistant covering material 13 is wound around the steel frame 11 and fixed by the fixing members 14. 4(B), one end 13A of the fire-resistant covering material 13 is first attached by being thrust into the pin portion 22 of the fixing member 14 adhered to the installation surface 12 on one side of the steel frame 11. Next, the fire-resistant covering material 13 is wrapped around the steel frame 11 except for the upper surface of the flange 11B (i.e., the surface that contacts the installation surface 12B), and then the other end 13B of the fire-resistant covering material 13 is attached by being thrust into the pin portion 22 of the fixing member 14 adhered to the installation surface 12 on the other side of the steel frame 11. Then, the tip side of the pin portion 22 into which the fire-resistant covering material 13 has been inserted is bent, and the fire-resistant covering material 13 is sandwiched between the bent portion and the flat portion 21, thereby obtaining the fire-resistant structure 10 shown in Figures 1 and 2.

[0048] As described above, in this embodiment, the fixing members 14 are adhered to the installation surface 12 with an adhesive without using welding or the like, and then the fire-resistant covering material 13 is fixed with the fixing members 14 and wrapped around the installation surface 12, thereby enabling the installation of the fire-resistant covering material 13. In addition, commercially available products can be used for the fire-resistant covering material 13 and the fixing members 14. Therefore, the fire-resistant covering material 13 can be installed easily by a method that is highly safe and does not require skill, without causing problems such as damage to the fire-resistant covering material 13. Furthermore, in this embodiment, since the fixing member 14 is adhered to the installation surface 12, gaps are less likely to form between the fire-resistant covering material 13 and the installation surface 12, which makes it easier to further improve fire resistance.

[0049] In the first embodiment described above, the installation surface 12 installed on the steel frame 11 is a top surface. However, the installation surface 12 is not limited to a top surface and may be a floor surface formed by the upper surface of a flat material such as a flooring material or a ceiling material. When the installation surface 12 is a floor surface, the steel frame 11 is placed above the installation surface 12. Therefore, the underside of the steel frame 11 (in the case of the H-shaped steel shown in FIG. 1, the underside of the flange 11C) is the surface that comes into contact with the installation surface 12. Therefore, the fire-resistant covering material 13 is wrapped around the steel frame 11 from above, except for the underside, and both ends 13A and 13B are pierced and fixed from above by fixing members 14 adhered to the installation surface 12.

[0050] Furthermore, the installation surface 12 installed on the steel frame 11 may be a wall surface made of a wall material. Even when the installation surface 12 is a wall surface, the fire-resistant covering material 13 is wrapped around the steel frame 11 except for the surface that comes into contact with the wall surface, and both ends 13A, 13B are inserted sideways into fixing members 14 adhered to the wall surface and fixed thereto. Examples of wall materials include concrete, cement boards, ALC (lightweight aerated concrete), extruded cement boards, metal sandwich panels, ceramic siding, curtain walls, and gypsum boards. In this case, the steel frame 11 may form a column in a building or civil engineering structure.

[0051] <Second embodiment> Next, a second embodiment of the present invention will be described with reference to Figures 5 to 7. In the first embodiment of the present invention, the steel frame 11 is installed on the installation surface 12, and the object to which the fixing members 14 are adhered is the installation surface 12, but in this embodiment, the object to which the fixing members 14 are adhered is the steel frame 11, and the fire-resistant covering material 13 is fixed to the steel frame 11 by the fixing members 14 adhered with an adhesive (adhesive layer 15).

[0052] The following description of the second embodiment will focus on the differences from the first embodiment, and portions for which description will be omitted are the same as those of the first embodiment. The steel frame 11 in this embodiment constitutes, for example, a column in a building or civil engineering structure, and the outer periphery covered with the fire-resistant covering material 13 is not in contact with the installation surface, such as a flooring material. Therefore, the fire-resistant covering material 13 is wrapped around the entire outer periphery of the steel frame 11. The fire-resistant covering material 13 is arranged such that both end faces 13A, 13B of the fire-resistant covering material 13 are butted against one surface of the steel frame 11 (the surface of the flange 11B in the configuration of FIG. 5).

[0053] Furthermore, fixing members 14, which are formed by fixing pins, are adhered to the steel frame 11 via an adhesive layer 15. Here, the fixing members 14 are adhered to one surface of the steel frame 11 by the adhesive layer 15 in accordance with the positions of the ends 13A and 13B of the fire-resistant covering material 13, and are lined up in pairs in the width direction of the steel frame 11 in accordance with the ends 13A and 13B, and multiple pairs of fixing members 14 lined up in the width direction are lined up at equal intervals along the axial direction of the steel frame 11. As in the first embodiment, the fire-resistant covering material 13 has both ends 13A, 13B pierced by the pin portions 22 of the fixing member 14, and the tip ends of the pierced pin portions 22 are bent, thereby fixing the fire-resistant covering material 13 and preventing the fire-resistant covering material 13 from falling out of the pin portions 22.

[0054] Next, a method for applying a fire-resistant covering material to obtain a fire-resistant structure according to a second embodiment will be described. In this embodiment, first, a steel frame 11, fixing pins as fixing members 14, and a fire-resistant covering material 13 are prepared. As shown in FIG. 7, in the bonding process, the fixing members 14 are bonded to the steel frame 11 using an adhesive 15. It is preferable to prepare a plurality of fixing members 14 and arrange them in pairs in the width direction on one surface of the steel frame 11 (on the surface of the flange 11B). It is preferable to arrange and bond a plurality of pairs of fixing members 14 (four in FIG. 7) at equal intervals along the axial direction of the steel frame 11. It is preferable to bond the fixing members 14 to the steel frame 11 in the same manner as the bonding of the fixing members 14 to the installation surface in the first embodiment.

[0055] Next, a winding step and a fixing step are carried out, in which the fire-resistant covering material 13 is wound around the steel frame 11 and fixed by the fixing members 14 . 7, one end 13A of the fire-resistant covering material 13 is first attached by being inserted into the pin portion 22 of one of the pair of fixing members 14 arranged in the width direction of the steel frame 11. Next, the fire-resistant covering material 13 is wrapped around the steel frame 11 once, and the other end 13B of the fire-resistant covering material 13 is then attached by being inserted into the pin portion 22 of the other of the pair of fixing members 14 arranged in the width direction. Thereafter, as in the first embodiment, the tip side of the pin portion 22 into which the fire-resistant covering material 13 has been pierced is bent, and the fire-resistant covering material 13 is sandwiched between the bent portion and the flat portion 21, thereby obtaining the fire-resistant structure 10B shown in Figures 5 and 6.

[0056] As described above, even when the installation surface 12 is not used, as shown in this embodiment, the fire-resistant covering material 13 can be installed by adhering the fixing members 14 with an adhesive without using welding or the like, then fixing the fire-resistant covering material 13 with the fixing members 14, and wrapping the fire-resistant covering material 13 around the fixing members 14. Therefore, the fire-resistant covering material 13 can be installed easily by a method that is highly safe and does not cause problems such as damage to the fire-resistant covering material 13, and does not require skill.

[0057] <Third embodiment> Next, a third embodiment of the present invention will be described with reference to Figures 8 to 10. The following description will focus on differences from the second embodiment, and parts that are the same as the second embodiment will not be described. In the above-mentioned second embodiment, both end portions 13A, 13B of the fire-resistant covering material 13 were not overlapped and were fixed by separate fixing members 14, but in the third embodiment, both end portions 13A, 13B of the fire-resistant covering material 13 are overlapped and the pin portion 22 of the fixing member 14 is inserted into the overlapped both end portions 13A, 13B.

[0058] That is, in this embodiment, as in the second embodiment, none of the outer periphery of the steel frame 11 that is covered with the fire-resistant covering material 13 comes into contact with the installation surface of a floor material or the like. Therefore, the fire-resistant covering material 13 is wrapped around the entire outer periphery of the steel frame 11. Then, the end portions 13A and 13B of the fire-resistant covering material 13 are overlapped on one surface of the steel frame 11 (the surface of the flange 11B).

[0059] Similarly to the second embodiment, the fixing members 14 each made up of a fixing pin are adhered to the steel frame 11 via an adhesive layer 15. Here, a plurality of the fixing members 14 are arranged at equal intervals along the axial direction of the steel frame 11 on one surface of the steel frame 11 (on the surface of the flange 11B) in correspondence with the overlapping positions of both end portions 13A, 13B of the fire-resistant covering material 13, and are adhered to one surface of the steel frame 11. Then, both end portions 13A, 13B of the overlapped fire-resistant covering material 13 are pierced by the pin portions 22 of the fixing member 14. Here, the pin portions 22 are longer than the thickness of two sheets of the fire-resistant covering material 13. Therefore, the tip sides of the pierced pin portions 22 protrude outward from the overlapped both end portions 13A, 13B, and the protruding tip sides of the pin portions 22 are bent, thereby fixing the fire-resistant covering material 13 and preventing the fire-resistant covering material 13 from falling out of the pin portions 22.

[0060] In this embodiment, the length of the pin portion 22 may be greater than the thickness of two layers of the fire-resistant covering material 13, as described above, and is, for example, about 5 to 250 mm, and preferably about 10 to 150 mm. The sizes of the other parts of the fixing member 14 and the sizes of the other members are as described in the first embodiment.

[0061] Next, a method of applying the fire-resistant covering material 13 to obtain a fire-resistant structure according to the third embodiment will be described. In this embodiment, first, a steel frame 11, fixing pins as fixing members 14, and the fire-resistant covering material 13 are prepared, and the fixing members 14 are adhered to the steel frame 11 using an adhesive. As shown in FIG. 10, a plurality of fixing members 14 may be prepared and aligned at equal intervals along the axial direction of the steel frame 11 on one surface of the steel frame 11 (the surface of the flange 11B), and then adhered. The fixing members 14 may be adhered to the steel frame 11 in the same manner as the fixing members 14 in the first embodiment are adhered to the installation surface.

[0062] Next, a winding step and a fixing step are carried out, in which the fire-resistant covering material 13 is wound around the steel frame 11 and fixed by the fixing members 14 . Specifically, as shown in FIG. 10 , one end 13A of the fire-resistant covering material 13 is first inserted into the pin portions 22 of a plurality of fixing members 14 arranged along the axial direction of the steel frame 11 and fixed thereto. The tips of the inserted pin portions 22 protrude outward from the overlapping ends 13A. Next, the fire-resistant covering material 13 is wrapped around the steel frame 11 once, and then the other end 13B is overlapped on the one end 13A and inserted into the pin portions 22, and the fire-resistant covering material 13 is attached in this wrapped state. Thereafter, as in the first embodiment, the tips of the pin portions 22 inserted with both ends 13A and 13B are bent, and the fire-resistant covering material 13 is sandwiched between the bent portion and the flat portion 21, thereby obtaining the fire-resistant structure 10C shown in FIGS. 9 and 10 . As described above, in this embodiment, as in the first and second embodiments, the fire-resistant coating material 13 can be easily installed using a method that is highly safe and does not require skill, without causing any problems such as damage to the fire-resistant coating material 13.

[0063] <Other embodiments> As described above, the present invention has been described using the first to third embodiments, but the present invention is not limited to the above embodiments and can take on various forms. For example, in the description of each of the above embodiments, the tip side of the pin portion 22 of the fixing pin is bent, so that the fire-resistant coating material 13 is fixed by the fixing member 14 and prevented from falling off, but the fire-resistant coating material 13 may be prevented from falling off from the tip side of the pin portion 22 by means other than bending. Specifically, a restricting member that restricts the fire-resistant covering material 13 from falling off the tip side of the pin portion 22 may be attached to the tip side of the pin portion 22. Then, the fire-resistant covering material 13 may be sandwiched between the restricting member and the flat portion 21 of the fixing member 14, thereby restricting the movement of the fire-resistant covering material 13 and fixing it. The restricting member may be, for example, a washer for the fixing pin. A commercially available washer for the fixing pin is the "Spring Washer" manufactured by Tilement Co., Ltd. Alternatively, a thread groove may be provided on the outer peripheral surface of the pin portion of the fixing pin, and a nut that is screwed into the thread groove may be used as the restricting member.

[0064] In the first embodiment described above, two fixing members 14 are arranged in the axial direction as shown in Figure 1, and in the second and third embodiments, four fixing members 14 are arranged in the axial direction, but the number of fixing members 14 arranged in the axial direction can be set appropriately according to the length of the fire-resistant coating material 13, and is not particularly limited as long as it is two or more.

[0065] In the fireproof structures 10, 10B, and 10C in the above embodiments, the length of the steel frame 11 is arbitrary and may be longer than the length of one piece of fireproof covering material 13. In such a case, one steel frame may be covered with a plurality of pieces of fireproof covering material 13 arranged in the axial direction of the steel frame 11. In this case, the ends of adjacent fireproof covering materials 13 (ends in the axial direction of the steel frame 11) may be butted together as in the ends 13A and 13B in the second embodiment, or may be overlapped as in the ends 13A and 13B in the third embodiment. When overlapping, the ends may be fixed by the fixing member 14 by inserting the pin portion 22 of the fixing member 14 so as to penetrate both overlapping ends.

[0066] Furthermore, in each of the above embodiments, as shown in Fig. 3, a fixing pin having one pin portion 22 provided on one flat portion 21 is used as the fixing member, but the number of pin portions 22 attached to one flat portion 21 of the fixing pin may be one or more, and may be multiple, for example, as shown in Fig. 11, where multiple pin portions 22 are provided on one flat portion 21. The number of pins attached to one flat portion 21 is not particularly limited, but is, for example, 10 or less, preferably 5 or less, and more preferably 3 or less. However, from the viewpoint of allowing free installation without restrictions on the attachment position or orientation, it is most preferable that the number of pin portions 22 provided on one flat portion 21 is 1.

[0067] In the above embodiments, the fixing member is a fixing pin that fixes the fire-resistant covering material 13 by piercing the pin portion 22 into the fire-resistant covering material 13. However, a fixing member other than a fixing pin can also be used. For example, a fixing member adhered to the steel frame 11 or the installation surface 12 via the adhesive layer 15 may be positioned to the side of the fire-resistant covering material 13 and sandwich the fire-resistant covering material 13 from the side, without piercing the fire-resistant covering material 13. In this case, the fixing member may be provided with a pinch portion that sandwiches the fire-resistant covering material. Alternatively, the fixing member may have a planar portion having a flat surface and a member that is shaped like a plate, needle, rod, or the like and attached to the planar portion, and the member may be bent to sandwich the fire-resistant covering material between the member and the planar portion.

[0068] Furthermore, even in the case where the steel frame 11 is installed on the installation surface 12 and part of the fire-resistant covering material 13 covers part of the installation surface 12 as in the first embodiment, the fixing member 14 may be adhered to the steel frame 11 instead of the installation surface 12 as in the second embodiment. However, in this case, care must be taken in the construction so that no gaps are formed between the installation surface 12 and the fire-resistant covering material 13.

[0069] Furthermore, in each of the above embodiments, H-shaped steel beams have been used as the steel frame 11, but steel frames other than H-shaped steel beams can also be used as the steel frame 11, and the present invention is applicable to steel materials of any shape, such as round steel beams, square steel beams, L-shaped steel beams, angle steel beams, and U-shaped steel beams. [Example]

[0070] The present invention will be described below with reference to examples, but the present invention is not limited to the scope of the examples.

[0071] [Example 1] A moisture-curing adhesive was obtained by adding and mixing 100 parts by mass of a polyalkylene oxide polymer having a hydrolyzable silyl group (manufactured by Kaneka Corporation, trade name "S303"), 80 parts by mass of glass frit (manufactured by Takara Standard Co., Ltd., trade name "VY0144", softening point: 400°C), 80 parts by mass of feldspar (nepheline syenite, manufactured by Shiraishi Calcium Co., Ltd., trade name "Nespar"), and 2 parts by mass of a silanol condensation catalyst (manufactured by Nitto Kasei Co., Ltd., trade name "Neostan U-130"). Next, a steel frame 11 made of H-shaped steel with a length of 675 mm, a height of 250 mm, and a width of 125 mm was placed on a mounting surface 12 made of ALC board, and the steel frame 11 was covered with a fire-resistant covering material 13 with a thickness of 20 mm according to the construction method of the first embodiment as described below, thereby obtaining a fire-resistant structure 10. The fire-resistant covering material 13 used was "Makibee," a product name manufactured by Nichias Corporation.

[0072] First, eight fixing pins (trade name "Spindle Rivets" manufactured by Tilement) were prepared as fixing members 14, and a moisture-curing adhesive was applied to the flat surface (surface 21A) of each fixing pin, and the fixing pins were temporarily fixed by pressing them against the installation surface 12. Here, four fixing pins were temporarily fixed to the installation surface on each side of the steel frame 11, evenly spaced along the axial direction of the steel frame 11. After that, the product was left in an environment of 23°C and 50% relative humidity for 24 hours, and the fixing pins were adhered to the installation surface 12 via adhesive layer 15. Next, one end 13A of the fire-resistant covering material 13 was pierced into the pin portions 22 of four fixing pins lined up on one side of the steel frame 11, and then the fire-resistant covering material 13 was wrapped around the steel frame 11. Next, the other end 13B of the fire-resistant covering material 13 was pierced into the pin portions 22 of four fixing pins lined up on the other side of the H-shaped steel. Thereafter, the tip sides of the pin portions 22 protruding from the fire-resistant covering material 13 were bent, thereby obtaining the fire-resistant structure 10 of Example 1. In Example 1, the fire-resistant structure 10 could be easily obtained without any work requiring skill.

[0073] (Evaluation of the adhesive and fire-resistant structure of Example 1) The moisture-curing adhesive obtained in Example 1 was measured for creep load resistance and strength after heating at 800°C for 30 minutes according to the method described in the specification. The creep load resistance was 1.0 mN / mm. 2 Furthermore, the strength after heating at 800°C for 30 minutes was 1.2N / mm 2 Furthermore, the resulting fireproof structure was placed inside a fireproof furnace and subjected to a fire resistance test in which it was heated to 945°C in one hour according to the standard heating curve specified in ISO834. The fireproof covering material did not fall off, and the fixing members remained firmly adhered to the installation surface. As described above, the adhesive of Example 1 had high creep load resistance and strength after heating for 30 minutes at 800° C. Therefore, it had high fire resistance and achieved good results in the fire resistance test.

[0074] [Reference example 1] The same procedure as in Example 1 was carried out, except that Sekisui Fuller's "Sekisui Bond #75" (a modified silicone moisture-curing adhesive; main components: modified silicone resin, calcium carbonate) was used as the adhesive. In Reference Example 1, the fireproof structure 10 was also easily obtained without any skilled work. The adhesive of Reference Example 1 was measured for creep resistance load and strength after heating at 800°C for 30 minutes according to the method described in the specification. For creep resistance load, a plate material 41 was dropped with a weight of 100 g, and the creep resistance load was 1 mN / mm 2 In addition, the strength after heating at 800°C for 30 minutes was 0 N / mm 2 The resulting fireproof structure was placed inside a fireproof furnace and subjected to a fire resistance test in which it was heated to 945°C in one hour according to the standard heating curve specified in ISO834, and the fixing members peeled off from the installation surface, causing the fireproof covering material to fall off from the installation surface. [Explanation of symbols]

[0075] 11 iron bones 12 Setting Surface 13 Refractory Coating Materials 13A and 13B ends 14 Fixed parts 15 Next layer 21. Planar section 21A Surface (Flat Surface) Inside 21B 22 ピンBU 30 Fixed Structure

Claims

1. A method for installing a fire-resistant covering material, comprising installing a fire-resistant covering material so as to cover a steel frame, an adhering step of adhering a fixing member to the steel frame or an installation surface to be installed on the steel frame with an adhesive; a winding step of winding the fire-resistant covering material around the steel frame; a fixing step of fixing the fire-resistant covering material with the fixing member bonded by the adhesive; A method for installing fire-resistant coating materials.

2. The adhesive had a creep resistance load of 0.8 mN / mm when heated at 600°C for 30 minutes and then at 800°C for 30 minutes. ２ The method for applying a fire-resistant coating material according to claim 1, wherein the method is as described above.

3. The adhesive has a strength of 0.1 N / mm after heating at 800°C for 30 minutes. ２ 3. The method for applying a fire-resistant coating material according to claim 1 or 2, wherein the fire-resistant coating material has a strength of at least 100%.

4. 3. The method for applying a fire-resistant coating material according to claim 1, wherein the adhesive is an adhesive containing an organic elastomer polymer as a main component.

5. 3. The method for applying a fire-resistant coating material according to claim 1, wherein the adhesive is an adhesive containing a silyl group-containing polymer.

6. 6. The method for applying a fire-resistant coating material according to claim 5, wherein the silyl group-containing polymer is a polyoxyalkylene polymer.

7. The method for applying a fire-resistant coating material according to claim 1 or 2, wherein the adhesive contains glass frit.

8. 3. The method for applying a fire-resistant covering material according to claim 1, wherein the fixing member is a fixing pin having a pin portion.

9. The method for applying a fire-resistant covering material according to claim 8 , wherein the fire-resistant covering material is fixed by the fixing pin by piercing the fire-resistant covering material into the pin portion.

10. The method for applying a fire-resistant covering material according to claim 9, further comprising bending the pin portion that has pierced the fire-resistant covering material, or attaching a restraining member to the pin portion.

11. 3. The method for installing a fire-resistant covering material according to claim 1 or 2, wherein the fixing member has a flat surface, and the flat surface is adhered to the steel frame or the installation surface via the adhesive.

12. The method for installing a fire-resistant covering material according to claim 1 or 2, wherein the steel frame constitutes a column or a beam.

13. Steel frame and a fire-resistant coating material wrapped around the steel frame; A fixing member that fixes the fire-resistant covering material to the steel frame or an installation surface to be installed on the steel frame; an adhesive layer that adheres the fixing member to the steel frame or the installation surface; A fire-resistant structure comprising:

14. A fixing structure for fixing a fire-resistant covering material covering a steel frame to the steel frame or an installation surface installed on the steel frame, A fixing structure comprising: a fixing pin having a pin portion and a flat surface; and an adhesive layer laminated on the flat surface to adhere the fixing pin to the steel frame or the installation surface.

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