JP7536729B2 - 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 structures are 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 before transporting them.

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 that is attached to the flange of a steel beam to which flooring is attached, and has a first protrusion and a second protrusion whose tip penetrates the fire-resistant covering material, a first support part that supports the base end of the first protrusion upright, a second support part that supports the base end of the second protrusion upright, a connecting part that connects and holds the first support part and the second support part, a contact part that is provided on the first support part and contacts one side of the flange, and a pressing part that is arranged opposite the contact part and contacts the other side of the flange so as to bias it toward the other side of the flange, and the connecting part has a first connecting part and a second connecting part, and the first connecting part is held movably relative to the second connecting part so that the distance between the first support part and the second support part can be adjusted.

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.

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 front perspective view of the fixing bracket for a fire-resistant covering material according to the first embodiment. FIG. 2 is a rear perspective view of the fixing bracket for a fire-resistant covering material according to the first 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.

Figure 1 is a perspective view showing a fire-resistant structure 1 according to a first embodiment of the present invention, and Figure 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 has fire-resistant flooring 3 horizontally arranged on both the left and right sides of a steel beam 2 as a structural body, the flooring 3 arranged on both the left and right sides are arranged at different heights relative to the steel beam 2, and the steel beam 2 arranged between the left and right flooring 3 is covered with a fire-resistant covering material 5, and L-angle members 8 for attaching the flooring 3 are provided on both sides of the upper side 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 may be an I-shaped steel, an L-shaped steel, an angle steel, or the like, as long as it has a flange 6. The floor material 3 is placed on an L-angle member 8 attached by welding to the upper surface of the upper flange 6 of the steel beam 2. The floor material 3 is made of a foamed lightweight concrete panel or the like, and has a predetermined fire resistance in the event of a fire. In the fitting of this embodiment, the floor material 3 arranged on the left side of the steel beam 2 in Figures 1 and 2 is arranged at a lower height than the floor material 3 arranged on the right side of the steel beam 2. The floor material 3 has multiple thicknesses determined by standards.

The L-angle members 8 are long members for attaching the flooring 3, and two L-angle members 8 are combined to fix the flooring 3 to the steel beam 2. The L-angle members 8 are steel members with an L-shaped cross section, and two L-angle members 8 are combined together by welding to form a Z-shape, with the flat plate portion of one L-angle member 8 fixed to the flange 6 of the steel beam 2 by bolting, welding, or the like, and the flooring is placed on the flat plate portion of the other L-angle member 8. In this embodiment, two L-angle members 8 are used combined by welding, but Z-shaped steel may also be used.
The gap formed on the upper surface of the upper flange 6 of the steel beam 2 and between the end faces of the floor materials 3 arranged on both the left and right sides is filled with mortar 12 or the like.

The fireproof structure 1 of this embodiment is a fireproof structure in which the portion of the steel beam 2 disposed between the left floor material 3 and the right floor material 3 that protrudes below the floor material 3 is covered with a flexible fireproof covering material 5. More specifically, on the left side of the steel beam 2, one end of the flexible fireproof covering material 5 is fixed to a fixing bracket 20 (described later) attached to the left side of the lower flange 6 of the steel beam 2, and on the right side of the steel beam 2, the other end of the flexible fireproof covering material 5 is fixed to a similar fixing bracket 20 (described later) attached to the right side of the lower flange 6 of the steel beam 2. By fixing one end of the fireproof covering material 5 to the fixing bracket 20 and fixing the other end to the fixing bracket 20, the steel beam 2 and the L-angle member 8 disposed between the left floor material 3 and the right floor material 3 are covered with the fireproof covering material 5, so that a fireproof structure that protects the steel beam 2 and the L-angle member 8 disposed between the floor materials 3 on both sides from high temperatures caused by fire, etc. can be realized.

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. A fixing bracket 20 for fixing one end of the fire-resistant covering material 5 is attached to the left side of the lower flange 6, and a fixing bracket 20 for fixing the other end of the fire-resistant covering material 5 is attached to the right side of the lower flange 6. In this embodiment, the height of the underside of the floor material 3 on the left side relative to the lower flange 6 is different from the height of the underside of the floor material 3 on the right side, but the fixing bracket 20 is a fixing bracket that can be adjusted to accommodate even when the height of the underside of the floor material 3 is different relative to the lower flange 6.

Next, the fixing bracket 20 for the fireproof covering material will be described with reference to Figures 4A and 4B. Figure 4A is a perspective view of the fixing bracket 20 seen from the front, and Figure 4B is a perspective view of the fixing bracket 20 seen from the rear. The fixing bracket 20 includes a first protrusion 21 and a second protrusion 22 whose tips penetrate the fireproof covering material 5, a flat first support part 24 that supports the base end of the first protrusion 21, a flat second support part 25 that supports the base end of the second protrusion 22, and a connecting part 26 that connects and holds the first support part 24 and the second support part 25. A male thread 23 is formed on the first protrusion part 21 and the second protrusion part 22, so that the fireproof covering material 5 penetrated by the first protrusion part 21 and the second protrusion part 22 can be fixed with a nut 40. When the fixing bracket 20 is attached to the lower flange 6 of the steel beam 2, the first support portion 24 functions as an abutment portion 27, with the surface opposite to the surface on which the first protrusion portion 21 is erected abutting against the lower surface, which is one surface of the flange 6.

The connecting portion 26 has a first connecting portion 33 that stands at a right angle from one end of the first support portion 24 in a direction opposite to the direction in which the first protrusion 21 stands, and a second connecting portion 34 that bends obliquely from one end of the second support portion 25 in a direction in which the second protrusion 22 stands. The first connecting portion 33 has five mounting holes 35 for attaching the second connecting portion 34 with a rivet 37 as a fastening means. The second connecting portion 34 has a connecting mounting portion 36 whose tip side is bent obliquely toward the second support portion 25 and is attached to the first connecting portion by the rivet 37. The connecting mounting portion 36 has two holes (not shown) for passing the rivet 37 through, and is attached to a hole whose pitch of the mounting holes 35 provided in the first connecting portion 33 and the pitch of the holes provided in the connecting mounting portion 36 are the same. In this embodiment, five mounting holes 35 are provided, but the number of mounting holes 35 does not have to be five as long as the mounting position of the second connecting portion 34 relative to the first connecting portion 33 can be changed. The first support portion 24 and the first connecting portion 33 are integrally formed, and the second support portion 25 and the second connecting portion 34 are integrally formed. The first connecting portion 33 has a reinforcing rib 38 for reinforcement, and the second connecting portion 34 has a reinforcing bead 39 for reinforcement. In this embodiment, the first connecting portion 33 has the reinforcing rib 38, and the second connecting portion 34 has the reinforcing bead 39, but either the reinforcing rib 38 or the reinforcing bead 39 may be used. Also, either the first supporting portion 24 or the second supporting portion 25 may be provided with either the reinforcing rib 38 or the reinforcing bead 39.

A pressing portion 28 arranged opposite the abutment portion 27 is attached by a rivet 37 to the surface of the first connecting portion 33 on the side where the first support portion 24 stands. The pressing portion 28 has a fixed portion 32 attached to the first connecting portion 33, a support plate portion 29 connected to one end of the fixed portion 32 at a right angle to the fixed portion 32 and arranged parallel to the abutment portion 27, a spring portion 30 connected to the tip of the support plate portion 29 and having a U-shaped elasticity that curves toward the abutment portion 27, and a flat pressing plate portion 31 connected to the tip of the spring portion 30 and whose tip extends obliquely toward one end side of the first support portion 24. When the fixing bracket 20 is attached to the lower flange 6 of the steel beam 2, the pressing plate portion 31 of the pressing portion 28 arranged opposite the abutment portion 27 is biased toward the other side of the flange 6 and abuts against the other side of the flange 6. In this embodiment, the fixing portion 32, the support plate portion 29, the spring portion 30, and the pressing plate portion 31 of the pressing portion 28 are integrally formed. The fixing portion 32 and the first connecting portion 33 may be fixed by other fastening means, such as screws or welding. The tip of the pressing plate portion 31 is disposed at a position where a clearance is generated between the tip of the pressing plate portion 31 and the abutting portion 27, and the clearance between the tip of the pressing plate portion 31 and the abutting portion 27 is smaller than the plate thickness of the flange 6 of the steel beam 2. The tip of the pressing plate portion 31 is formed in a wavy shape. The tip of the pressing plate portion 31 does not necessarily have to be formed in a wavy shape, but it is preferable that it is formed in a wavy shape. By forming it in a wavy shape, when the fixing bracket 20 is attached to the lower flange 6 of the steel beam 2, the wavy part at the tip of the pressing plate portion 31 bites into the surface of the flange 6, and the fixing bracket 20 is less likely to come off the steel beam 2.

The connecting portion 26 connects the first support portion 24 and the second support portion 25 so that the first protrusion 21 of the first support portion 24 and the second protrusion 22 of the second support portion 25 face the same direction. In addition, when the fixing bracket 20 is attached to the lower flange 6 of the steel beam 2, the second support portion 25 is arranged closer to the floor material 3 than the first support member 24 and abuts against the lower surface of the floor material 3 without interfering with the L-angle member 8. In addition, the second connecting portion 34 of the connecting portion 26 is bent so that the first support portion 24 and the second support portion 25 are arranged in parallel. The connecting portion 26 includes a first connecting portion 33 and a second connecting portion 34, and the second connecting portion 34 can be held by a rivet 37 in any one of the multiple mounting holes 35 provided in the first connecting portion 33, so that the relative positions of the first support portion 24 and the second support portion 25 can be changed. That is, the first connecting part 33 is held movably relative to the second connecting part 34. Therefore, even if floor materials 3 of different thicknesses are used, or the position of the bottom surface of the floor material 3 is different in the height direction relative to the lower flange 6 of the steel beam 2, there is no need to prepare multiple types of fixing brackets, and only one type of fixing bracket 20 can be used.

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 the fire-resistant structure 1. For this reason, for example, iron plate, galvanized steel plate, stainless steel plate, etc. can be used. For the pressing portion 28, considering the spring properties of the spring portion 30, a spring stainless steel plate is particularly suitable.

Next, the attachment of the fixing bracket 20 to the lower flange 6 of the steel beam 2 will be described using Figure 3. The fixing bracket 20 is attached to the lower flange 6 of the steel beam 2. The fixing bracket 20 is attached to the steel beam 2 by pushing the fixing bracket 20 into the flange 6 so that the tip of the flange 6 is inserted into the clearance between the tip of the pressing plate portion 31 and the abutment portion 27. The clearance between the tip of the pressing plate portion 31 and the abutment portion 27 is smaller than the plate thickness of the lower flange 6 of the steel beam 2, and because the spring portion 30 is elastic, the abutment portion 27 and the pressing plate portion 31 hold the flange 6 by clamping it therebetween due to the biasing force of the spring portion 30. In addition, the tip of the pressing plate portion 31 extends obliquely toward one end side of the first support portion 24, i.e., toward the connection portion between the first support portion 24 and the first connecting portion 33. Therefore, when the fixing bracket 20 tries to move in a direction to remove it from the flange 6, the tip of the pressing plate portion 31 acts in a direction to bite into the flange 6, preventing the fixing bracket 20 from coming off the flange 6. In addition, the tip of the pressing plate portion 31 is formed in a wavy shape, which further prevents the fixing bracket 20 from coming off the flange 6.

When the fixing bracket 20 is attached to the lower flange 6 of the steel beam 2, the connecting portion 26 is bent to connect the first support portion 24 and the second support portion 25 so that the second support portion 25 is in a position that does not interfere with the L-angle member 8 and is positioned closer to the floor material 3 than the first support member 24 and abuts against the underside of the floor material 3.Therefore, when the fire-resistant covering material 5 is fixed to the second protrusion portion 22 that is supported upright on the second support portion 25, the fire-resistant covering material 5 can be prevented from floating up from the exterior wall material 4.
A reinforcing rib 38 is provided at the first connecting portion 33 of the fixing bracket 20, and a reinforcing bead 39 is provided at the second connecting portion 34, so that deflection of the first connecting portion 33 and the second connecting portion 34 due to the weight of the fire-resistant coating material 5, etc., can be suppressed.

Next, 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.
The fireproof structure 1 of this embodiment is a fireproof structure in which the portion of the steel beam 2 disposed between the left-side floor material 3 and the right-side floor material 3 that protrudes below the floor material 3 is covered with a fireproof covering material 5. Fixing brackets 20 are attached to both left and right ends of the lower flange 6 of the steel beam 2. On the left side of the steel beam 2, with the fixing bracket 20 attached to the lower flange 6 of the steel beam 2, the second support portion 25 is in a position that does not interfere with the L-angle member 8 and abuts against the underside of the left-side floor material 3. On the right side of the steel beam 2, with the fixing bracket 20 attached to the lower flange 6 of the steel beam 2, the second support portion 25 is in a position that does not interfere with the L-angle member 8 and abuts against the underside of the right-side floor material 3.

On the left side of the steel beam 2, one end of the fire-resistant coating material 5 is passed through the second protrusion 22 erected on the second support part 25 of the fixing bracket 20 attached to the left side of the flange 6, and a nut 40 is fastened to the second protrusion 22 on which the male thread 23 is formed, so that one end of the fire-resistant coating material 5 is fixed to the fixing bracket 20. Similarly, on the left side of the steel beam 2, the other end of the fire-resistant coating material 5 is passed through the second protrusion 22 erected on the second support part 25 of the fixing bracket 20 attached to the right side of the flange 6, and a nut 40 is fastened to the second protrusion 22 on which the male thread 23 is formed, so that the other end of the fire-resistant coating material 5 is fixed to the fixing bracket 20. The middle part of the fire-resistant coating material 5 is passed through the first protrusion 21 erected on the first support part 24 of the fixing bracket 20 attached to both the left and right sides of the flange 6, and a nut 40 is fastened to the first protrusion 21 on which the male thread 23 is formed, so that the middle part of the fire-resistant coating material 5 is fixed to the fixing bracket 20.

According to the fire-resistant structure 1 of this embodiment, one end of the fire-resistant covering material 5 is attached to the second protrusion 22 of the left fixing bracket 20, the other end is attached to the second protrusion 22 of the right fixing bracket 20, and the middle of the fire-resistant covering material 5 is attached to the first protrusion 21 of the fixing brackets 20 on both the left and right sides, so that the steel beam 2 and the L-angle member 8 arranged between the left floor material 3 and the right floor material 3 are covered with the fire-resistant covering material 5. In addition, since the fixing bracket 20 is fixed to the lower flange 6 of the steel beam 2 by the abutment portion 27 and the pressing portion 28, no welding is required and the fixing bracket 20 can be easily attached to the lower flange 6 of the steel beam 2.

In addition, since the male thread 23 is formed on the first protrusion 21 and the second protrusion 22, the nut 40 can reliably prevent the fireproof coating material 5 from falling off. In addition, since the fireproof coating material 5 is made of resin containing a thermal expansion material, it prevents 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 has excellent 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 this embodiment, the steel beam 2 and the L-angle member 8 arranged between the left floor material 3 and the right floor material 3 are 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 and the L-angle member 8 from high temperatures caused by fires, etc. can be realized, and a fireproof structure that is easy to work with 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.
Also, although an example in which the steel beam 2 is covered with the fire-resistant covering material 5 has been described, it is also applicable to columns. Also, the male threads 23 do not have to be formed on the first protrusion 21 and the second protrusion 22, and for example, they may be wire-like protrusions. In this case, the first protrusion 21 and the second protrusion 22 are pierced into the fire-resistant covering material 5, and then the tips are bent, thereby preventing the fire-resistant covering material 5 from falling off.

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 20 will be specifically described.
The fixing bracket 20 is attached to the left side of the flange 6 on the lower side of the steel beam 2, and the fixing bracket 20 is attached to the right side of the flange 6 on the lower side of the steel beam 2. The fixing bracket 20 is attached to the flange 6 by inserting the tip of the flange 6 into the clearance between the tip of the pressing plate portion 31 of the fixing bracket 20 and the abutting portion 27, and pushing the fixing bracket 20 into the flange 6. Next, one end side of the fire-resistant covering material 5 is passed through the second protrusion portion 22 of the fixing bracket 20, and a nut 40 is fastened to the second protrusion portion 22 on which the male thread 23 is formed, thereby fixing the one end side of the fire-resistant covering material 5 to the fixing bracket 20. Next, the other end side of the fire-resistant covering material 5 is passed through the second protrusion portion 22 of the fixing bracket 20, and a nut 40 is fastened to the second protrusion portion 22 on which the male thread 23 is formed, thereby fixing the other end side of the fire-resistant covering material 5 to the fixing bracket 20. Next, the middle portion of the fire-resistant covering material 5 is inserted through the first protrusion 21 of the fixing bracket 20 attached to both the left and right sides of the flange 6, and a nut 40 is tightened to the first protrusion 21 having a male thread 23 formed thereon to fix the middle portion of the fire-resistant covering material 5 to the fixing bracket 20, thereby covering the steel beam 2 and the L-angle member 8 with the fire-resistant covering material 5.
By fixing one end, a middle portion, and the other end of the fire-resistant coating material 5 to the fixing brackets 20, workability is good and construction can be carried out at low cost.

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, 4...exterior wall material, 5...fire-resistant covering material, 6...flange, 7...web, 8...L-angle member, 12...mortar, 20...fixing bracket, 21...first protrusion, 22...second protrusion, 23...male screw, 24...first support part, 25...second support part, 26...connecting part, 27...contact part, 28...pressing part, 29...support plate part, 30...spring part, 31...pressing plate part, 32...fixing part, 33...first connecting part, 34...second connecting part, 35...mounting hole, 36...connecting mounting part, 37...rivet, 38...reinforcing rib, 39...reinforcing bead, 40...nut

Claims (10)

A metal fitting for fixing a flexible fire-resistant covering material to a flange of a steel beam to which a floor material is attached,
a first protrusion and a second protrusion, the tips of which penetrate the fire-resistant covering material;
A first support portion that supports a base end of the first protrusion portion in an upright position;
A second support portion that supports a base end of the second protrusion portion in an upright position;
a connecting portion that connects and holds the first support portion and the second support portion;
a contact portion provided on the first support portion and contacting one surface of the flange;
a pressing portion disposed opposite the abutting portion and abutting against the other surface of the flange so as to bias the other surface toward the other surface,
the connecting portion includes a first connecting portion and a second connecting portion, and the first connecting portion is held movably relative to the second connecting portion so that a gap between the first support portion and the second support portion can be adjusted ;
When the fixing bracket is attached to the flange of the steel beam, the second support portion is disposed closer to the floor material than the first support portion and is in contact with the floor material,
A fixing bracket for fire-resistant covering material, characterized in that when the fixing bracket is attached to the flange of the steel beam, the second support portion is positioned closer to the floor material than the first support portion, and the connecting portion is bent so as to abut against the floor material . The fixing bracket for fire-resistant covering material according to claim 1, characterized in that the tip of the first protrusion and the tip of the second protrusion face in the same direction. The fixing bracket for fire-resistant covering material according to claim 1 or 2, characterized in that at least one of a reinforcing rib or a reinforcing bead is formed on either the first support part, the second support part, or the connecting part. 4. The fixing bracket for a fire-resistant covering material according to claim 1, wherein the first protrusion and the second protrusion are formed with male threads. In a fireproof structure, a side of a steel beam to which a flooring material is attached that protrudes beyond the flooring material is covered with a flexible fireproof covering material, and the fireproof covering material is fixed to a fixing metal fitting that is attached to the steel beam and has a part abutting against the flooring material,
The fixing fixture is a fixing fixture for a fire-resistant covering material according to any one of claims 1 to 4 , wherein the second support portion abuts against the floor material,
A fire-resistant structure, characterized in that the first protrusion portion and the second protrusion portion penetrate the fire-resistant covering material, thereby fixing the fire-resistant covering material to the fixing bracket. In the fire-resistant structure described in claim 5, the fixing metal fitting is the fixing metal fitting for a fire-resistant covering material described in claim 4 ,
A fire-resistant structure, characterized in that the fire-resistant covering material is fixed to the fixing bracket by passing the male screw through the fire-resistant covering material and fastening a nut to the male screw. 7. The fire-resistant structure according to claim 5 , wherein the fire-resistant coating material is made of a resin base material containing a thermal expansion material. The fire-resistant structure according to any one of claims 5 to 7 , characterized in that the fixing bracket is attached to the steel beam by sandwiching the flange of the steel beam between the abutment portion and the pressing portion. A method for constructing a fire-resistant structure in which a side of a steel beam to which a flooring material is attached that protrudes beyond the flooring material is covered with a flexible fire-resistant covering material, and the fire-resistant covering material is fixed to a fixing metal fitting that is attached to the steel beam and has a portion abutting against the flooring material, comprising:
The fixing metal fitting is a fixing metal fitting for a fire-resistant covering material according to any one of claims 1 to 4 ,
The fixing bracket is attached to the flange of the steel beam, and the second support portion abuts against the floor material,
The first protrusion and the second protrusion are caused to penetrate the fire-resistant covering material, and the fire-resistant covering material is fixed to the fixing metal fitting;
A construction method for fire-resistant structure, comprising covering the steel beams with the fire-resistant covering material. The fastener is a fastener for a fire-resistant covering material according to claim 4,
The method for constructing a fire-resistant structure according to claim 9, characterized in that the fire-resistant covering material is fixed to the fixing fixture by passing the male screw through the fire-resistant covering material and fastening a nut to the male screw.

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