JP7488237B2 - Fixtures for fire-resistant covering materials, fire-resistant structures, and methods for constructing fire-resistant structures - Google Patents

Description

The present invention relates to fire-resistant structures in which structural members such as beams and columns are covered with fire-resistant covering materials.

Steel structures such as beams and columns lose their strength when exposed to high temperatures due to fire or other causes, so fire-resistant construction is necessary to prevent this.
As an example of such a fireproof structure, there is a method of spraying and covering a fireproof material such as rock wool to a predetermined thickness (for example, Patent Document 1). In Patent Document 1, a fireproof material is sprayed onto a steel beam to cover it.

JP 2017-128844 A

The method of spraying fireproofing material onto steel frames is inexpensive and can be easily applied to large structures, but the working environment is extremely poor and it is difficult to control the thickness and density of the sprayed fireproofing material. In addition, the performance of the material deteriorates when it absorbs water, so it is difficult to spray the material onto the steel frames in a factory beforehand and then transport it.

In response to this, a method has been proposed in which rock wool is wrapped around a steel frame and then pins are welded to the steel frame in that state to secure the rock wool. However, this method requires special tools to weld the pins that secure the rock wool to the steel frame, making it less versatile. In addition, as this method involves on-site welding work, it is dangerous if there are flammable materials in the vicinity. On the other hand, the performance of rock wool deteriorates when it absorbs water, so it is difficult to transport the material after wrapping it around the steel frame and welding the pins in advance at a factory.

Another method has been proposed in which a base material is glued to the surface of the steel frame and calcium silicate boards are fixed with nails. However, because this method uses molded boards, workability is not necessarily good, as they tend to crack during handling. In addition, molded boards are more expensive than the method of wrapping fireproofing materials around the steel frame.
A method of applying a thermal expansion paint to the surface of steel frames has also been proposed. However, controlling the thickness of the paint applied is difficult, and the paint itself is very expensive. For this reason, a cheaper and easier method is desired.

The present invention was made in consideration of these problems, and aims to provide a fire-resistant structure that is easy to work with and can be constructed inexpensively.

One aspect of the present invention is a fixing bracket for fixing a flexible fire-resistant covering material to a flooring or exterior wall material of a structure to which the flooring or exterior wall material is attached, the fixing bracket having a protrusion whose tip penetrates the fire-resistant covering material, a support part that supports the base end of the protrusion in an upright position, and a mounting hole formed in the support part for mounting the support part to the flooring or exterior wall material with a fastening member.

By using a fixing bracket for fire-resistant covering material according to one aspect of the present invention, it is possible to provide a fire-resistant structure that is easy to work with and can be constructed inexpensively.

FIG. 1 is a perspective view showing a fireproof structure according to a first embodiment. 1 is a cross-sectional view showing a fireproof structure according to a first embodiment. 1 is a perspective view showing a state before a fire-resistant covering material of a fire-resistant structure according to a first embodiment is attached. FIG. FIG. 2 is a perspective view of a fixing bracket for a fire-resistant covering material according to the first embodiment. FIG. 2 is an enlarged perspective view showing the attached state of the fixing bracket for a fire-resistant covering material according to the first embodiment. FIG. 11 is a bottom perspective view of a fixing bracket for a fire-resistant covering material according to a second embodiment. FIG. 6 is an upper perspective view of a fixing bracket for a fire-resistant covering material according to a second embodiment.

The following describes in detail an embodiment of the present invention with reference to the accompanying drawings. In the following description of the drawings, identical or similar parts are given the same or similar reference numerals. However, the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each part, and the like differ from the actual ones. In addition, the following embodiments are illustrative of structures and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components as described below. The technical idea of the present invention may be modified in various ways within the technical scope defined by the claims.

Fig. 1 is a perspective view showing a fire-resistant structure 1 according to a first embodiment of the present invention, and Fig. 2 is a cross-sectional view showing the fire-resistant structure 1 according to an embodiment of the present invention. The fire-resistant structure 1 according to the embodiment is a fire-resistant structure in which fire-resistant flooring 3 is horizontally arranged on both the left and right sides of the upper surface of a steel beam 2 as a structural body, the flooring 3 arranged on both the left and right sides are arranged so that they are at the same height relative to the steel beam 2, and the parts of the steel beam 2 arranged below the left and right flooring 3 that do not face the flooring 3 are covered with a fire-resistant coating material 5. Fixing brackets 20, which are fixing brackets for fire-resistant coating material for attaching the fire-resistant coating material 5, are arranged near the steel beam 2 of the flooring 3 arranged on both the left and right sides of the steel beam 2.

In this embodiment, the steel beam 2 is a so-called H-shaped steel in which a pair of flanges 6 are connected by a web 7. The steel beam 2 is not particularly limited to an I-shaped steel, an L-shaped steel, an angle steel, etc., as long as it has a flange 6. The flooring 3 arranged on both the left and right sides is placed so as to cover the upper surface of the upper flange 6 of the steel beam 2. The flooring 3 is made of foamed lightweight concrete panels, etc., and has a predetermined fire resistance in itself in the event of a fire. The flooring 3 is available in multiple thicknesses determined by standards.

The fire-resistant structure 1 of this embodiment is a fire-resistant structure in which the portion of the steel beam 2 arranged below the left floor material 3 and the right floor material 3 that does not face the floor material 3 is covered with a flexible fire-resistant coating material 5. Since the upper surface of the upper flange 6 faces the floor material 3, the portion of the steel beam 2 that does not face the floor material 3 is the end face of the upper flange 6, the web 7, and the lower flange 6, which are covered with the flexible fire-resistant coating material 5. A fixing bracket 20 is attached to the underside of the floor material 3, which is the surface that faces the upper surface of the upper flange 6, and a flexible fire-resistant coating material 5 is attached to the fixing bracket 20. On the left side of the steel beam 2, one end of the fire-resistant coating material 5 is fixed to the fixing bracket 20 attached to the underside of the left floor material 3, and on the right side of the steel beam 2, the other end of the fire-resistant coating material 5 is fixed to the fixing bracket 20 attached to the underside of the right floor material 3. The fixing bracket 20 attached to the underside of the floor material 3 is positioned near the upper flange 6 of the steel beam 2. One end of the fire-resistant covering material 5 is fixed to the fixing bracket 20 attached to the left floor material 3, and the other end is fixed to the fixing bracket 20 attached to the right floor material 3. This means that the steel beam 2 exposed from the underside of the left and right floor materials 3 is covered with the fire-resistant covering material 5, realizing a fire-resistant structure that protects the steel beam 2 from high temperatures caused by fires, etc. The fixing bracket 20 attached to the underside of the left and right floor materials 3 is the same fixing bracket, and has an L-shaped cross section.

The fireproof coating material 5 is preferably a sheet-like member containing a thermal expansion material. In consideration of ease of handling, the fireproof coating material 5 is preferably one that is not mainly composed of inorganic fibers such as rock wool, but is based on resin. In other words, the fireproof coating material 5 is preferably configured by including a thermal expansion material in the resin that is the base material. The resin is not particularly limited, but examples of applicable resins include thermoplastic resins, thermosetting resins, rubber, elastomers, etc. In addition, the thermal expansion material contained in the resin is not particularly limited, but examples of applicable materials include layered inorganic materials and phosphorus compounds. Examples of layered inorganic materials include vermiculite, kaolin, mica, and thermally expandable graphite, and thermally expandable graphite is particularly preferred. Furthermore, glass frit, inorganic filler, etc. may be blended with the resin. The fireproof coating material 5 may be a foam or a non-foam.

The fire-resistant coating material 5 may also be combined with other materials. The other materials are not particularly limited as long as they do not impair the effects of this embodiment, but materials exhibiting heat resistance and/or flame retardancy are preferred. An example of a composite combining the fire-resistant coating material 5 with other materials is a laminate of the fire-resistant coating material 5 and a non-combustible sheet, and examples of the non-combustible sheet include a metal sheet and an inorganic fiber sheet. Examples of the metal sheet include metal sheets made of stainless steel, aluminum, iron, etc. In this way, by forming a composite with a metal sheet, the fire resistance performance can be further improved. In addition, a composite material of the fire-resistant coating material 5 and an inorganic fiber sheet can also be used. Examples of the inorganic fiber sheet include sheets, non-woven fabrics, woven fabrics, etc. made of glass fibers, cellulose fibers, ceramic wool fibers, rock wool fibers, etc. The non-woven fabrics and woven fabrics may be laminated with thin aluminum layers. One or more of such non-combustible sheets can be used.

Figure 3 is a perspective view showing the state of the fire-resistant structure 1 according to the embodiment before the fire-resistant covering material 5 is attached. As shown in Figure 3, the fixing bracket 20 for fixing one end of the fire-resistant covering material 5 is attached in contact with the left end face of the upper flange 6. The fixing bracket 20 for fixing the other end of the fire-resistant covering material 5 is also attached in contact with the right end face of the upper flange 6.

Next, the fixing bracket 20 for the fireproof covering material will be described with reference to FIG. 4. FIG. 4 is a perspective view of the fixing bracket 20 seen from above. The fixing bracket 20 has a protrusion 21 whose tip penetrates the fireproof covering material 5, and a support part 24 that supports the base end of the protrusion 21 in an upright position. The support part 24 has a support member 26 and an abutment member 27 and has an L-shaped cross section. The protrusion 21 is supported in an upright position at the center of the support member 26, and the abutment member 27 has two mounting holes 35 for mounting the fixing bracket 20 to the floor material 3 via mounting screws 41. The protrusion 21 has a male thread 23, so that the fireproof covering material 5 penetrated by the protrusion 21 can be fixed with a nut 40. The two mounting holes 35 and the protrusion 21 are arranged so that the protrusion 21 is located in the middle of the two mounting holes 35 when the fixing bracket 20 is viewed from the bottom of FIG. 4. In this embodiment, the protrusion 21 is positioned so as to be located midway between the two mounting holes 35, but as long as the protrusion 21 is positioned so as not to overlap with the axis of the mounting hole 35, the protrusion 21 is not limited to being located midway between the two mounting holes 35. By positioning the protrusion 21 so as not to overlap with the axis of the mounting hole 35, the protrusion 21 and the mounting screw 41 do not interfere with each other when passing the mounting screw 41 through the mounting hole 35, making it easier to attach the mounting screw 41. The number of mounting holes 35 is not limited to two, and there may be one or more than two.

The material of the fixing bracket 20 is preferably one that does not easily deform even in a high-temperature atmosphere caused by a fire, etc., since it is a bracket used in a fire-resistant structure. For this reason, for example, iron plate, galvanized steel plate, stainless steel plate, etc. can be used.

Next, the attachment of the fixing bracket 20 to the floor material 3 will be explained using Figures 3 and 5. The fixing bracket 20 is attached in two places to each of the underside of the left floor material 3 and the underside of the right floor material 3, which are placed on the top surface of the upper flange 6 of the steel beam 2. The fixing bracket 20 is positioned so that the support part 24 abuts against the end surface of the upper flange 6 of the steel beam 2, and the fixing bracket 20 is fixed to the underside of the floor material 3 by the mounting screw 41 through the mounting hole 35. Since the protrusion 21 is positioned so as to be located halfway between the two mounting holes 35, the mounting screw 41 does not interfere with the protrusion 21, making the installation work of the mounting screw 41 easy.

Next, the fire-resistant structure 1 in which the fire-resistant covering material 5 covers the steel beam 2 using the fixing bracket 20 will be specifically described with reference to Figs. 1 and 2. The fire-resistant structure 1 of this embodiment is a fire-resistant structure in which floor materials 3 having fire resistance are horizontally arranged on both the left and right sides of the upper surface of the steel beam 2, and the part of the steel beam 2 that is arranged under the left and right floor materials 3 and does not face the floor material 3 is covered with the fire-resistant covering material 5. One end of the fire-resistant covering material 5 is fixed to two fixing brackets 20 attached to the underside of the left floor material 3, and on the right side of the steel beam 2, the other end of the fire-resistant covering material 5 is fixed to two fixing brackets 20 attached to the underside of the right floor material 3. One end of the fire-resistant covering material 5 is fixed to the fixing bracket 20 attached to the left floor material 3, and the other end of the fire-resistant covering material 5 is fixed to the fixing bracket 20 attached to the right floor material 3, so that the steel beam 2 arranged under the left floor material 3 and the right floor material 3 is covered with the fire-resistant covering material 5.

One end of the fire-resistant covering material 5 is passed through the protrusion 21 of the fixing bracket 20 attached to the floor material 3 on the left side, and a nut 40 is fastened to the protrusion 21 on which the male thread 23 is formed, thereby fixing one end of the fire-resistant covering material 5 to the fixing bracket 20. Similarly, the other end of the fire-resistant covering material 5 is passed through the protrusion 21 of the fixing bracket 20 attached to the floor material 3 on the left side, and a nut 40 is fastened to the protrusion 21 on which the male thread 23 is formed, thereby fixing the other end of the fire-resistant covering material 5 to the fixing bracket 20.

According to the fireproof structure 1 of the present embodiment, since the male thread 23 is formed on the protrusion 21, the nut 40 can reliably suppress the fall-off of the fireproof coating material 5. In addition, since the fireproof coating material 5 is made of resin containing a thermal expansion material, it suppresses the deterioration of the working environment and is lightweight, making it easy to work with. In addition, by applying resin as a base material, it is excellent in water resistance and can suppress deterioration during transportation compared to conventional rock wool, which is mainly composed of inorganic fibers, so that transportation work is easy. Therefore, in the fireproof structure 1 of the present embodiment, the steel beam 2 arranged below the left floor material 3 and the right floor material 3 is covered with the fireproof coating material 5 from the left floor material 3 to the right floor material 3, so that a fireproof structure that protects the steel beam 2 from high temperatures caused by fires, etc. can be realized, and a fireproof structure that has good workability and can be constructed at low cost can be provided.
It is more preferable to use a so-called round type speed nut as the nut 40, since this allows for easy fixing by simply inserting the nut into the male thread 23.

In this embodiment, an example has been described in which the steel beam 2 to which the floor material 3 is attached is covered with the fire-resistant covering material 5, but it can also be applied to a steel column as a structure to which an exterior wall material is attached. In addition, the protrusion 21 does not have to have a male thread 23 formed thereon, and may be, for example, a wire-like protrusion. In this case, the protrusion 21 is pierced into the fire-resistant covering material 5 and then the tip is bent, thereby preventing the fire-resistant covering material 5 from falling off.

Next, a method of constructing the fire-resistant structure 1 in which the fire-resistant covering material 5 covers the steel beams 2 using the fixing brackets 20 will be specifically described with reference to Figs.
First, as shown in FIG. 3, two fixing brackets 20 are attached to the underside of the left floor material 3 placed on the left upper surface of the upper flange 6 of the steel beam 2 using mounting screws 41, and then two fixing brackets 20 are attached to the underside of the right floor material 3 placed on the right upper surface of the upper flange 6 of the steel beam 2 using mounting screws 41. The fixing brackets 20 are arranged so that the surface opposite to the surface supported by the protrusions 21 of the support member 26 is in contact with the end surface of the flange 6 of the steel beam 2. Therefore, the fixing brackets 20 are arranged so that the tips of the protrusions 21 face the opposite side to the steel beam 2. The fixing brackets 20 may be attached from either the left or right side. Next, one end of the fireproof covering material 5 is passed through the protrusions 21 of the two fixing brackets 20 attached to the underside of the left floor material 3, and a nut 40 is fastened to the protrusions 21 on which the male threads 23 are formed, to fix one end of the fireproof covering material 5. Next, the other end of the fire-resistant covering material 5 is passed through the protrusions 21 of the two fixing brackets 20 attached to the underside of the right-side floor material 3, and a nut 40 is tightened to the protrusion 21 having a male thread 23 formed therein, fixing the other end of the fire-resistant covering material 5 and covering the steel beam 2 with the fire-resistant covering material 5.

First, the fixing bracket 20 is attached to the floor material 3 using the mounting screw 41, then one end side and the other end side of the fireproof coating material 5 are inserted through the protrusion 21 of the fixing bracket 20, and then the nut 40 is fastened to the protrusion 21, so that the fireproof coating material 5 can be attached by one installer alone, which makes the installation of the fireproof coating material 5 easy and allows for inexpensive construction. On the other hand, in the conventional technology, the fireproof coating material 5 is directly screwed to the floor material 3, but it is difficult for one person to screw the fireproof coating material upwards to the hard floor material while holding it in a specified position, so construction had to be done by multiple people. However, in the case of the construction method of the fireproof structure using the fixing bracket 20 according to this embodiment, the fireproof coating material 5 can be temporarily fixed with the nut 40, so it has the effect of allowing one installer to install the fireproof coating material 5.

Next, a fixing bracket 51 for a fire-resistant covering material according to the second embodiment will be described with reference to Figures 6A and 6B. Figure 6A is a perspective view of the fixing bracket 51 as seen from below, and Figure 6B is a perspective view of the fixing bracket 51 as seen from above. The difference between the fixing bracket 51 according to the second embodiment and the fixing bracket 20 according to the first embodiment is that the supporting portion 24 of the fixing bracket 20 according to the first embodiment has a supporting member 26 and an abutting member 27 and has an L-shaped cross section, whereas the supporting portion of the fixing bracket 51 according to the second embodiment does not have an L-shaped cross section, and an attachment hole 35 is formed in the flat supporting member 53 that supports the base end of the protrusion 21 in an upright position. The other configurations are the same as those of the fixing bracket 20 according to the first embodiment. Below, the same reference numerals are used for configurations common to the fixing bracket 20 according to the first embodiment.

The fixing bracket 51 has a protrusion 21 whose tip penetrates the fireproof covering material 5 and a support portion 52 that supports the base end of the protrusion 21, and the support portion 52 is made of a flat support member 53. The protrusion 21 stands in the center of the support member 53, and two mounting holes 35 are formed in the support member 53 so as to sandwich the protrusion 21. As shown in FIG. 6B, the mounting screw 41 for attaching the fixing bracket 51 to the floor material 3 may be fixed in advance with a retaining ring 54 so as not to come off the fixing bracket 51.

Next, a method for constructing the fire-resistant structure 1 in which the fire-resistant covering material 5 covers the steel beams 2 using the fixing brackets 51 will be specifically described.
First, two fixing brackets 51 are attached to the underside of the left floor material 3 placed on the left upper surface of the upper flange 6 of the steel beam 2 using the mounting screws 41, and then two fixing brackets 51 are attached to the underside of the right floor material 3 placed on the right upper surface of the upper flange 6 of the steel beam 2 using the mounting screws 41. The fixing brackets 51 are arranged so that the end faces of the support members 53 abut against the end faces of the flanges 6 of the steel beam 2. Therefore, the fixing brackets 51 are attached so that the tips of the protrusions 21 face downward. The fixing brackets 20 may be attached from either the left or right side. Next, one end of the fireproof coating material 5 is passed through the protrusions 21 of one of the fixing brackets 51 attached to the underside of the left floor material 3, and a nut 40 is fastened to the protrusions 21 on which the male threads 23 are formed. Similarly, the other end of the fire-resistant covering material 5 is passed through the protrusion 21 of the other fixing metal fitting 51 attached to the underside of the left floor material 3, and a nut 40 is fastened to the protrusion 21 on which the male thread 23 is formed, thereby fixing one end of the fire-resistant covering material 5. Next, the other end of the fire-resistant covering material 5 is passed through the protrusion 21 of one fixing metal fitting 51 attached to the underside of the right floor material 3, and a nut 40 is fastened to the protrusion 21 on which the male thread 23 is formed. Similarly, the other end of the fire-resistant covering material 5 is passed through the protrusion 21 of the other fixing metal fitting 51 attached to the underside of the right floor material 3, and a nut 40 is fastened to the protrusion 21 on which the male thread 23 is formed, thereby fixing the other end of the fire-resistant covering material 5, and the steel beam 2 is covered with the fire-resistant covering material 5.

First, the fixing bracket 51 is attached to the floor material 3 using the mounting screw 41, then one end of the fireproof coating material 5 is inserted through the protrusion 21 of the fixing bracket 51 and the nut 40 is fastened to the protrusion 21, and then the other end of the fireproof coating material 5 is inserted through the protrusion 21 of the fixing bracket 51 and the nut 40 is fastened to the protrusion 21. This allows the fireproof coating material 5 to be installed by a single installer, so the installation of the fireproof coating material 5 is easy and can be performed at low cost. On the other hand, in the conventional technology, the fireproof coating material 5 is directly screwed to the floor material 3, but it is difficult for one person to screw the fireproof coating material upwards to the hard floor material while holding it in a specified position, so multiple people had to be involved in the installation. However, in the case of the installation method of the fireproof structure using the fixing bracket 20 according to this embodiment, the fireproof coating material 5 can be temporarily fixed with the nut 40, so the fireproof coating material 5 can be installed by a single installer.

The above description refers to a limited number of embodiments, but the scope of the rights is not limited to these, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art.

1...fire-resistant structure, 2...steel beam, 3...floor material, 5...fire-resistant covering material, 6...flange, 7...web, 20...fixing bracket, 21...projection, 23...male screw, 24...support, 26...support member, 27...contact member, 35...mounting hole, 40...nut, 41...mounting screw, 51...fixing bracket, 52...support, 53...support member, 54...stop ring

Claims (12)

A fixing bracket for fixing a flexible fire-resistant covering material to a floor material or an exterior wall material of a structure to which the floor material or the exterior wall material is attached, comprising:
A protrusion having a tip penetrating the fireproof covering material;
A support portion that supports a base end of the protrusion portion in an upright position;
and a mounting hole formed in the support portion for mounting the fixing metal fitting to the floor material or the exterior wall material by a fastening member ,
The support portion is a flat support member,
A fastening fixture for a fire-resistant covering material, characterized in that the protrusion is supported upright on the support member and the mounting hole is formed therein . 2. The fastener for a fire-resistant covering material according to claim 1 , wherein the protrusion is arranged so as not to overlap with the axis of the mounting hole. 3. The fixing bracket for a fire-resistant covering material according to claim 1, wherein the protrusion is formed with a male thread. In a fireproof structure, a portion of a structure to which a floor material or an exterior wall material is attached that does not face the floor material or the exterior wall material is covered with a flexible fireproof covering material, and the fireproof covering material is attached to a fixing metal fitting attached to a surface of the floor material or the exterior wall material that faces the structure,
The fastener is a fastener for a fire-resistant covering material according to any one of claims 1 to 3 ,
A fire-resistant structure, characterized in that the protrusion penetrates the fire-resistant covering material, thereby fixing the fire-resistant covering material to the fixing bracket. In the fire-resistant structure according to claim 4 , the fixing metal fitting is the fixing metal fitting for a fire-resistant covering material according to claim 3 ,
A fire-resistant structure characterized in that a nut is fastened to the male thread of the protrusion that penetrates the fire-resistant covering material, thereby fixing the fire-resistant covering material to the fixing bracket. 6. The fireproof structure according to claim 4, wherein the fireproof coating material is made of a resin base material containing a thermal expansion material. 7. The fire-resistant structure according to claim 4, wherein the fixing metal fittings are attached to the floor material or the exterior wall material by fastening members, the fastening members being mounting screws. A fire-resistant structure as described in any one of claims 4 to 7, characterized in that the structural member is a steel beam to which the floor material is attached, the portion of the steel beam that does not face the floor material is covered with a flexible fire-resistant covering material, and the fire-resistant covering material is attached to the fixing bracket attached to the surface of the floor material facing the steel beam. A method for constructing a fire-resistant structure, in which a portion of a structure to which a floor material or an exterior wall material is attached that does not face the floor material or the exterior wall material is covered with a flexible fire-resistant covering material, and the fire-resistant covering material is attached to a fixing metal fitting attached to a surface of the floor material or the exterior wall material that faces the structure,
The fastener is a fastener for a fire-resistant covering material according to any one of claims 1 to 3 ,
A method for constructing a fire-resistant structure, characterized in that the protrusions of the fixing brackets penetrate the fire-resistant covering material, thereby fixing the fire-resistant covering material to the fixing brackets, and covering the structure with the fire-resistant covering material. In the method for constructing a fire-resistant structure according to claim 9 , the fastener is the fastener for a fire-resistant covering material according to claim 3 ,
A method for constructing a fire-resistant structure, characterized in that a nut is fastened to the male thread of the protrusion that penetrates the fire-resistant covering material, thereby fixing the fire-resistant covering material to the fixing bracket. The method for constructing a fire-resistant structure according to claim 9 or 10, characterized in that the structure is a steel beam to which the floor material is attached, the portion of the steel beam that does not face the floor material is covered with a flexible fire-resistant covering material, and the fire-resistant covering material is attached to the fixing bracket attached to the surface of the floor material facing the steel beam. A fixing bracket for fixing a flexible fire-resistant covering material to a floor material or an exterior wall material of a structure to which the floor material or the exterior wall material is attached, comprising:
A protrusion having a tip penetrating the fireproof covering material;
A support portion that supports a base end of the protrusion portion in an upright position;
and a mounting hole formed in the support portion for mounting the fixing metal fitting to the floor material or the exterior wall material by a fastening member,
The support portion has a support member and a contact member and has an L-shaped cross section,
The protrusion is supported upright on the support member, and the attachment hole is formed in the abutment member,
A fixing bracket for a fire-resistant covering material, characterized in that the protrusion and the mounting hole are both located inside the support part having an L-shaped cross section.

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