Fire-resistant structures, construction methods for fire-resistant structures, and fastening hardware

Abstract

A fireproof structure 1 is formed by covering a beam 5, which is a structure, with a fireproof covering material 11. A fixing metal fitting 7 is disposed between a pair of flanges 13 formed in the beam 5. The fireproof covering material 11 is fixed to the fixing metal fitting 17. In this case, the fireproof covering material 11 is fixed to the fixing metal fitting 7 by piercing a projection of the fixing metal fitting 7 into the fireproof covering material 11. The fireproof covering material 11 is a flexible member. The beam 5 is covered with the fireproof covering material 11 by fixing the fireproof covering material 11 to the beam 5 in a state of being wound therearound.

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant structure in which structural members such as beams and columns are covered with a fire-resistant covering material. [Background technology]

[0002] Steel structures such as beams and columns lose their strength when exposed to high temperatures due to fires, etc., so fire-resistant structures are necessary to prevent this.

[0003] 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, the fireproof material is sprayed onto steel beams to cover them. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-128844 Summary of the Invention [Problem to be solved by the invention]

[0005] 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 deteriorates when the material absorbs water, so it is difficult to spray the material onto the steel frames in advance at a factory and then transport it.

[0006] In response to this problem, a method has been proposed in which rock wool is wrapped around a steel frame and 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. Furthermore, since this method involves on-site welding, it is dangerous if there are flammable materials nearby. Meanwhile, the performance of rock wool deteriorates when it absorbs water, so it is difficult to transport the rock wool after wrapping it around the steel frame and welding the pins in advance at a factory.

[0007] Another proposed method involves gluing a base material to the surface of the steel frame and then fastening calcium silicate boards with nails. However, because this method uses molded boards, they are prone to cracking during handling, making them less workable. Furthermore, molded boards are more expensive than methods that involve wrapping fire-resistant materials around the steel frame.

[0008] Another method proposed is to apply thermally expandable paint to the surface of steel frames. However, controlling the thickness of the paint applied is difficult, and the paint itself is very expensive. For these reasons, a cheaper and easier method is desired.

[0009] The present invention has been made in view of the above problems, and has as its object to provide a fire-resistant structure or the like that is easy to work with and can be constructed inexpensively. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, a first invention is a fire-resistant structure in which a structure is covered with a fire-resistant covering material, comprising: a structure having a flange portion; a fixing bracket fixed to the structure; and the fire-resistant covering material fixed to the fixing bracket, wherein the fixing bracket has a spring portion for fixing to the flange portion of the structure and a protrusion protruding outward from the fixing bracket; In order to make it easier for the tip of the spring portion to bite into the flange portion, This fire-resistant structure is characterized in that jagged teeth are formed at the tip of the spring portion, and the protrusion penetrates the fire-resistant covering material, fixing the fire-resistant covering material to the fixing bracket, and the structure is covered by the flexible fire-resistant covering material.

[0011] The protrusion may be a male screw, and the male screw may be inserted into the fire-resistant covering material and fixed with a nut from the outer surface side of the fire-resistant covering material.

[0012] The fire-resistant covering material is preferably constructed by including a thermal expansion material in a resin base material.

[0013] The fixing bracket may have the spring portion near each end of the main body portion, the fixing bracket may be arranged between a pair of flange portions formed on the structure, and the spring portions may be pressed against the inner surfaces of the flange portions, thereby fixing the fixing bracket to the structure and causing the protrusion portion to protrude toward the outer surface of the main body portion.

[0014] in this case, Both ends of the main body in the width direction are bent toward where the spring portion is formed, The main body is formed with reinforcing ribs. The main body is formed in a substantially U-shape in a cross section perpendicular to the longitudinal direction. That's fine.

[0015] In addition, the spring portion may be formed to face the main body portion of the fixing bracket, and the fixing bracket may be fixed to the structure by sandwiching the flange portion of the structure between the main body portion and the spring portion, and the protrusion portion may protrude toward the outer surface of the main body portion.

[0016] According to the first aspect of the present invention, the fixing metal fitting is fixed to the structure using the spring portion, which makes the fixing work easy. Also, since the fire-resistant covering material can be fixed to the fixing metal fitting by piercing the fire-resistant covering material into the protrusion of the fixing metal fitting, welding work is not required, and the fire-resistant covering material can be easily fixed to the structure without using special tools.

[0017] Furthermore, if the protrusion is a male thread, the fire-resistant covering material can be reliably fixed to the fixing fixture by tightening a nut after piercing it.

[0018] Furthermore, if the fire-resistant coating material is constructed by including a thermal expansion material in the base resin, a thin fire-resistant coating material can be used, making it easier to work with and, since it is water-resistant, it is also easy to transport.

[0019] Furthermore, by arranging springs near both ends of the main body of the fixture, when the fixture is placed between a pair of flanges of an H-beam, the elastic force of the springs expanding can secure the fixture between the flanges. This means that the fixture can be secured to the beam even when the floor is in contact with the top and there is no gap between the beam and the floor.

[0020] In this case, by forming ribs on the main body, deflection of the main body is suppressed, and the fastening metal fittings can be prevented from falling off.

[0021] Furthermore, by forming the main body and spring portion of the fixture so that they face each other, the flange portion of the structure can be sandwiched between the main body and spring portion, making it easy to secure the fixture to the structure.

[0022] A second invention is a method for constructing a fire-resistant structure in which a fire-resistant covering material is fixed to a structure using a fixing metal fitting, the fixing metal fitting having a spring portion for fixing to a flange portion of the structure and a protrusion portion protruding outward from the fixing metal fitting, In order to make it easier for the tip of the spring portion to bite into the flange portion, This is a fire-resistant structure construction method characterized in that jagged teeth are formed at the tip of the spring portion, the fixing bracket is fixed to the structure by the spring portion, the protrusion is pierced into the fire-resistant covering material to fix the fire-resistant covering material to the structure, and the structure is covered with the fire-resistant covering material.

[0023] According to the second aspect of the present invention, the fixing brackets can be easily attached to the structure on-site, making the work easy.

[0024] A third invention is a construction method for a fire-resistant structure in which a fire-resistant covering material is fixed to a structure using a fixing metal fitting, the fixing metal fitting having a spring portion for fixing to a flange portion of the structure and a protrusion portion protruding outward from the fixing metal fitting, the protrusion is a male screw; The aforementioned Male thread is inserted into the fire-resistant covering material at a predetermined position, By Nut The fire-resistant coating material a pair The fixing bracket is fixed and fixed to the fire-resistant covering material by the spring portion. On the other hand The fixing bracket is attached to the structure. one side of Fixed to The fire-resistant covering material is wrapped around the structure, and the other fixing metal fitting is fixed to the other side of the structure. By doing so, the fire-resistant covering material is attached to the structure. Stick to This is a construction method for a fire-resistant structure characterized by determining the

[0025] According to the third aspect of the present invention, the fixing metal fittings for the fire-resistant covering material can be fixed in advance, for example, in a factory, etc., thereby reducing the amount of work on-site and shortening the work time.

[0026] In the second and third inventions, the protrusion may be a male screw, which may be inserted into the fire-resistant covering material and fixed with a nut from the outer surface side of the fire-resistant covering material.

[0027] A fourth invention is a fixing metal fitting for fixing a fire-resistant covering material to a structure, the fixing metal fitting having a main body portion, spring portions formed near both ends of the main body portion for fixing the material to a flange portion of the structure, and a male screw portion protruding outward from the main body portion, To make it easier for the tip of the spring to bite into the flange, This fixing bracket is characterized in that jagged teeth are formed at the tip of the spring portion, and when the fixing bracket is placed between a pair of flange portions formed on a structure, the spring portions are pressed against the inner surfaces of the flange portions, thereby making it possible to fix the fixing bracket to the structure.

[0028] A fifth invention is a fixing fixture for fixing a fire-resistant covering material to a structure, the fixing fixture having a main body, a spring portion formed to face the main body and for fixing to a flange portion of the structure, and a male thread portion protruding outward from the main body, To make it easier for the tip of the spring to bite into the flange,The spring portion has jagged teeth formed at its tip, When the flange portion is inserted between the spring portion and the main body portion, The fixing fixture is characterized in that the fixing fixture can be fixed to a structure by sandwiching the flange portion between the main body portion and the spring portion.

[0029] Fourth 、5 According to the invention, the fixing bracket can be fixed to the structure by spring force, so welding work or the like is not required and the work is easy. [Effects of the Invention]

[0030] According to the present invention, it is possible to provide a fire-resistant structure or the like that is easy to work with and can be constructed at low cost. [Brief explanation of the drawings]

[0031] [Figure 1A] FIG. 1 is a front view showing a fire-resistant structure 1. [Figure 1B] Cross-sectional view taken along line AA in Figure 1A. [Figure 2] FIG. [Figure 3A] A diagram showing the construction method of fire-resistant structure 1. [Figure 3B] A diagram showing the construction method of fire-resistant structure 1. [Figure 3C] A diagram showing the construction method of fire-resistant structure 1. [Figure 4A] 10 is a diagram showing another construction method for the fire-resistant structure 1. FIG. [Figure 4B] 10 is a diagram showing another construction method for the fire-resistant structure 1. FIG. [Figure 5A] FIG. [Figure 5B] Cross-sectional view of line BB in Figure 5A. [Figure 6A] 10 is a perspective view showing a fixing metal fitting 7b. FIG. [Figure 6B] Cross-sectional view taken along line CC in FIG. 6A. [Figure 7] FIG. [Figure 8A] FIG. 10 is a top perspective view showing the fixing bracket 7e. [Figure 8B] FIG. 10 is a bottom perspective view showing the fixing bracket 7e. [Figure 9A] FIG. 1 is a front view showing a fire-resistant structure 1a. [Figure 9B] Cross-sectional view taken along line DD in Figure 9A. [Figure 10] FIG.

[0032] (First embodiment) Hereinafter, embodiments of the present invention will be described. Fig. 1A is a front view showing a fire-resistant structure 1 according to a first embodiment, and Fig. 1B is a cross-sectional view taken along line AA in Fig. 1A. The fire-resistant structure 1 has a beam 5, which is a structural member, covered with a fire-resistant covering material 11.

[0033] The beam 5 is a so-called H-shaped steel in which a pair of flange portions 13 are connected by a web 15. The structure is not particularly limited to I-shaped steel, L-shaped steel, angle steel, etc., as long as it has flange portions 13. A floor 3 is installed on top of the beam 5. Fixing brackets 7 are fixed to the beam 5 to secure the fire-resistant covering material 11 to the beam 5. The floor 3 contacts the beam 5, and no gap is formed between them through which the fixing brackets 7 can be inserted.

[0034] In FIG. 2, the fixing bracket 7 has a main body 17 and spring portions 19 provided near both ends of the main body 17. The spring portions 19 are used to fix the fixing bracket 7 to the flange portion 13 of the beam 5. A protrusion 21 protrudes toward the outer surface of the main body 17 (the surface opposite the spring portion 19). In other words, the fixing bracket 7 has a protrusion that protrudes outward. The protrusions 21 are located near both ends of the main body 17, in positions substantially similar to those of the spring portions 19. The fixing bracket 7 is joined to the plate-shaped main body 17 by, for example, welding, at the spring portions 19 and protrusions 21. The protrusions 21 are, for example, pin-shaped so that they can be inserted into the fire-resistant covering material, as will be described later, and are preferably male threads.

[0035] The material of the fixing bracket 7 is not particularly limited, but may be, for example, an iron plate, a galvanized steel plate, or a stainless steel plate, and in consideration of spring properties, a stainless steel plate for springs is particularly suitable.

[0036] The positions and number of the protrusions 21 are not limited to those shown in the example. For example, a protrusion 21 may be further disposed at approximately the center in the longitudinal direction of the main body 17. The shape of the spring 19 is not limited to the example shown in the figure, and is not particularly limited as long as it is a shape that can obtain the effects of this embodiment.

[0037] 1B, the fixing bracket 7 is placed between a pair of flange portions 13 formed on the beam 5. In this case, the distance between both ends of the pair of spring portions 19 is slightly larger than the distance between the flange portions 13. For this reason, the fixing bracket 7 is inserted between the flange portions 13 while the spring portions 19 are elastically deforming. In this way, each of the spring portions 19 has a restoring force that acts outward, and is pressed against the inner surfaces of the flange portions 13, thereby fixing the fixing bracket 7 to the beam 5.

[0038] The fixing brackets 7 are arranged on both sides of the beam 5. The fixing brackets 7 are also arranged at predetermined intervals in the longitudinal direction of the beam 5. For example, the fixing brackets 7 are arranged at intervals according to the width of the fire-resistant covering material 11.

[0039] A fire-resistant covering material 11 is fixed to the fixing bracket 7. At this time, the protrusions 21 pierce the fire-resistant covering material 11, thereby fixing the fire-resistant covering material 11 to the fixing bracket 7. The fire-resistant covering material 11 is a flexible member, and by fixing the fire-resistant covering material 11 in a state where it is wrapped around the beam 5, the beam 5 is covered with the fire-resistant covering material 11.

[0040] The fire-resistant coating material 11 is preferably a sheet-like member containing, for example, a thermal expansion material. Considering ease of handling, the fire-resistant coating material 11 is preferably one based on resin rather than primarily composed of inorganic fibers such as rock wool. That is, the fire-resistant coating material 11 is preferably constructed by incorporating a thermal expansion material into the resin base material. The resin is not particularly limited, but examples of applicable resins include thermoplastic resins, thermosetting resins, rubber, and elastomers. The thermal expansion material contained in the resin is not particularly limited, but examples include layered inorganic materials and phosphorus compounds. Examples of layered inorganic materials include vermiculite, kaolin, mica, and thermally expandable graphite, with thermally expandable graphite being particularly preferred. Furthermore, glass frit, inorganic fillers, etc. may be blended into the resin. The fire-resistant coating material 11 may be a foam or a non-foam.

[0041] The fire-resistant covering material 11 may also be combined with other components. The other components are not particularly limited as long as they do not impair the effects of this embodiment, but heat-resistant and / or flame-retardant components are preferred. Examples of composites combining the fire-resistant covering material 11 with other components include those in which the fire-resistant covering material 11 is bonded to a non-combustible sheet. Examples of the non-combustible sheet include a metal sheet and an inorganic fiber sheet. Examples of metal sheets that can be used include metal sheets made of stainless steel, aluminum, iron, etc. Such composites with metal sheets can further improve fire resistance. Other examples include composites of the fire-resistant covering material 11 and an inorganic fiber sheet. Examples of inorganic fiber sheets include sheets made of glass fiber, cellulose fiber, ceramic wool fiber, rock wool fiber, etc., as well as non-woven fabrics and woven fabrics. The non-woven fabrics and woven fabrics may be laminated with a thin aluminum layer. One or more of these non-combustible sheets can be used.

[0042] In this embodiment, the protrusion 21 is a male screw. Therefore, by inserting the male screw into the fire-resistant covering material 11 and tightening the nut 9 from the outer surface side of the fire-resistant covering material 11, the fire-resistant covering material 11 can be reliably fixed to the fastening fixture 7. It is more preferable to use a so-called round-type speed nut as the nut 9, as this allows for easy fixing by simply inserting it into the male screw.

[0043] The upper end of the fire-resistant covering material 11 may be arranged so as to abut against the underside of the floor 3, or as shown in FIG. 1B, the vicinity of the upper end of the fire-resistant covering material 11 may be folded back along the underside of the floor 3. This makes it possible to more reliably cover the beam 5 with the fire-resistant covering material 11 without any gaps. Furthermore, the widthwise ends of the fire-resistant covering materials 11 may abut against each other in the longitudinal direction of the beam 5, or they may be arranged so as to overlap each other. In this case, protrusions 21 may be inserted into the overlapping portions of the fire-resistant covering materials 11 to secure them together.

[0044] Next, we will explain the construction method of the fire-resistant structure 1, in which the fire-resistant covering material 11 is fixed to the structure using the fixing bracket 7. First, as shown in FIG. 3A, the fixing bracket 7 is inserted between the flange portions 13 of the beam 5 and fixed to the beam 5 by the spring portion 19. Next, as shown in FIG. 3B, the protrusion portion 21 of the fixing bracket 7 is pierced into the fire-resistant covering material 11, and the fire-resistant covering material 11 is attached to the fixing bracket 7.

[0045] In this way, the fire-resistant covering material 11 is pierced into the protrusions 21 of the fixing brackets 7 to fix the fire-resistant covering material 11 to the beam 5, and the fire-resistant covering material 11 is bent to cover the entire circumference of the beam 5. Finally, as shown in FIG. 3C, nuts 9 are attached to the protrusions 21 (male threads) from the outer surface side of the fire-resistant covering material 11. In this way, the fire-resistant structure 1 can be constructed.

[0046] The construction method of the fire-resistant structure 1 is not limited to the example described above. For example, the fixing bracket 7 may be fixed to the fire-resistant covering material 11 in advance at a factory or the like by inserting the protrusion 21 of the fixing bracket 7 into a predetermined position on the fire-resistant covering material 11. The fire-resistant covering material 11 with the fixing bracket 7 fixed thereto is transported to the installation site. Note that, because the nut 9 is fastened to the protrusion 21 of the fixing bracket 7, the fire-resistant covering material 11 will not fall off the protrusion 21 during transportation.

[0047] Next, as shown in Fig. 4A, the fixing bracket 7 fixed to the fire-resistant covering material 11 is fixed to the beam 5 by the spring portion 19. Furthermore, as shown in Fig. 4B, the fire-resistant covering material 11 is wrapped around the beam 5 and the fixing bracket 7 is fixed to the beam 5, thereby fixing the fire-resistant covering material 11 to the beam 5 and constructing the fire-resistant structure 1.

[0048] As described above, according to the first embodiment, the fixing bracket 7 is fixed to the beam 5 by the spring portion 19, so welding is not required and the fixing bracket 7 can be easily fixed to the beam 5. Furthermore, the fire-resistant covering material 11 can be fixed to the fixing bracket 7 simply by piercing the fire-resistant covering material 11 into the protrusion 21 of the fixing bracket 7. Therefore, the fire-resistant covering material 11 can be easily fixed to the beam 5.

[0049] Furthermore, because the protrusion 21 is a male thread, the nut 9 can reliably prevent the fire-resistant covering material 11 from falling off. Furthermore, because the fire-resistant covering material 11 is made of resin containing a thermal expansion material, it prevents deterioration of the working environment and is lightweight, making it easy to work with. Furthermore, by using resin as the base material, it has superior water resistance compared to conventional materials such as rock wool, which are primarily composed of inorganic fibers, and it can prevent deterioration during transportation, making transportation easy.

[0050] In the above description, an example in which a beam 5 is covered with the fire-resistant covering material 11 as a structural body has been described, but the present invention can also be applied to a column. Furthermore, the protrusion 21 does not have to be a male screw, and may be, for example, a wire-like pin. In this case, by piercing the fire-resistant covering material 11 with the protrusion 21 and then bending the tip, it is possible to prevent the fire-resistant covering material 11 from falling off.

[0051] If the deflection of the main body 17 becomes too great when the fire-resistant covering material 11 is fixed, the fixing metal fitting 7 may fall off the structure. For this reason, the main body 17 of the fixing metal fitting 7 may be reinforced.

[0052] Fig. 5A is a perspective view showing the fixing bracket 7a, and Fig. 5B is a cross-sectional view taken along line BB in Fig. 5A. Fixing bracket 7a has substantially the same structure as fixing bracket 7, but differs in that reinforcing ribs 23 are formed on the main body 17. The main body 17 is formed with ribs 23 that protrude toward the rear side along the longitudinal direction. The ribs 23 are formed between the protruding portions 21. The ribs 23 increase the rigidity of the main body 17, thereby making it possible to suppress deflection of the main body 17 due to the weight of the fire-resistant covering material 11, etc.

[0053] Furthermore, the shape of the rib is not limited to the example shown in Fig. 5. Fig. 6A is a perspective view showing fixing bracket 7b, and Fig. 6B is a cross-sectional view taken along line CC in Fig. 6A. Fixing bracket 7b has substantially the same structure as fixing bracket 7a, but differs in that it has ribs 23a. Fixing bracket 7b has ribs 23a formed by bending both ends of main body 17 in the width direction toward the rear surface. That is, main body 17 is formed in a substantially U-shape in a cross section perpendicular to the longitudinal direction. The ribs 23a increase the rigidity of main body 17, thereby suppressing deflection of main body 17 due to the weight of fire-resistant covering material 11, etc.

[0054] Furthermore, the main body portion 17 and the spring portion 19 may be integrally formed rather than being formed separately and then joined. FIG. 7 is a perspective view showing a fixing bracket 7d. The fixing bracket 7d has a structure similar to that of the fixing bracket 7b, but differs in that the main body portion 17 and the spring portion 19 are formed from a single plate-like material. In this case, a pair of spring portions 19 are formed on both sides in the width direction near each end, and a portion of the main body portion 17 protrudes toward the end between the spring portions 19, forming a protrusion 21 at that location. Furthermore, both sides in the width direction of the main body portion 17 are bent to function as ribs 23b. In this way, the fixing bracket 7d functions similarly to the fixing bracket 7b, etc., and is easy to manufacture.

[0055] Furthermore, when the main body 17 and the spring 19 are formed separately, the member forming the spring 19 and the member forming the protrusion 21 may be joined together. Fig. 8A is an upper perspective view showing the fixing bracket 7e, and Fig. 8B is a lower perspective view showing the fixing bracket 7e. The fixing bracket 7e has substantially the same structure as the fixing bracket 7a, etc., but differs in that the plate-shaped member forming the spring 19 and the plate-shaped member having the protrusion 21 are joined together with rivets 25. In this case, the rib 23c may be formed on either the plate-shaped member forming the spring 19 or the plate-shaped member having the protrusion 21.

[0056] As shown in fixtures 7d and 7e, jagged teeth may be formed at the tip of spring portion 19. This makes it easier for the tip of spring portion 19 to bite into other components. Such teeth can also be applied to other fixtures.

[0057] (Second embodiment) Next, a second embodiment will be described. Fig. 9A is a diagram showing a fire-resistant structure 1a, and Fig. 9B is a cross-sectional view taken along line DD in Fig. 9A. In the following description, the same components as those in the fire-resistant structure 1 and the like are designated by the same reference numerals as in Figs. 1 to 8, and redundant description will be omitted.

[0058] In the fire-resistant structure 1a according to the second embodiment, a pillar 5a, which is a structural body, is covered with a fire-resistant covering material 11. In this case, the fire-resistant covering material 11 is fixed to the pillar 5a by a fixing metal fitting 7c.

[0059] 10 is a perspective view of fixing bracket 7c. Like fixing bracket 7 and the like, fixing bracket 7c is formed with spring portions 19 for fixing to flange portion 13 of the structure. Spring portions 19 are formed to face main body portion 17. Protrusions 21 also protrude outward from main body portion 17. More specifically, plate-shaped main body portion 17 is bent in the opposite direction to the protrusion direction of protrusions 21, and spring portions 19 are formed to face the back side of protrusions 21.

[0060] By inserting the flange portion 13 of the pillar 5a between the spring portion 19 and the main body portion 17, the flange portion 13 is sandwiched between the spring portion 19 and the main body portion 17, and the fixing bracket 7c is fixed to the pillar 5a. The fixing bracket 7c is fixed to both ends of each flange portion 13 of the pillar 5a. In other words, the fixing brackets 7c are arranged in four locations at approximately the same height on the pillar 5a.

[0061] The fire-resistant covering material 11 is wrapped around the column 5a. At this time, the protrusions 21 are pierced into the fire-resistant covering material 11, thereby fixing the fire-resistant covering material 11 to the column 5a. Although the ends of the fire-resistant covering material 11 may be butted together, it is preferable to lap the ends together. At this time, the protrusions 21 may be pierced through two pieces of fire-resistant covering material 11 at the lapped portion to fix them together.

[0062] The fire-resistant structure 1a can be constructed in the same manner as the fire-resistant structure 1. That is, the fixing brackets 7c are fixed to the pillars 5a at predetermined positions, and the fire-resistant covering material 11 is then pierced into the protrusions 21 of the fixed fixing brackets 7c and wrapped around the pillars 5a to be fixed. Even in this case, the fire-resistant covering material 11 can be reliably fixed in place with the nuts 9 after wrapping the fire-resistant covering material 11.

[0063] Alternatively, the protrusions 21 of the fixing brackets 7c may be inserted into predetermined positions on the fire-resistant covering material 11 in advance to fix the material. In this case, the fixing brackets 7c can be fixed to the fire-resistant covering material 11 in advance with nuts 9. By using the fire-resistant covering material 11 with the fixing brackets 7c fixed in this way, the fire-resistant covering material 11 can be easily fixed to the column 5a by wrapping the fixing brackets 7c around the column 5a while attaching them to the column 5a.

[0064] According to the second embodiment, it is possible to obtain the same effects as those of the first embodiment. Furthermore, the fixing metal fitting 7c can be used regardless of the distance between the flange portions 13.

[0065] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not limited to the above-described embodiments. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the technical ideas described in the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention. [Explanation of symbols]

[0066] 1, 1a……Fireproof structure 3...Floor 5……Beam 5a……pillar 7, 7a, 7b, 7c...Fixing metal fittings 9...Nut 11……Fireproof covering material 13...Flange section 15...Web 17...Main body 19...Spring section 21……Protrusion 23, 23a, 23b, 23c...Ribs 25...Rivet

Claims

1. A fire-resistant structure in which a structure is covered with a fire-resistant covering material, a structure having a flange portion; a fixture fixed to the structure; a fire-resistant covering material fixed to the fixing bracket; Equipped with The fixing metal fitting has a spring portion for fixing to the flange portion of the structure and a protrusion portion protruding outward from the fixing metal fitting, and jagged teeth are formed at the tip of the spring portion to make it easier for the tip of the spring portion to bite into the flange portion, A fire-resistant structure characterized in that the protrusions pierce the fire-resistant covering material, thereby fixing the fire-resistant covering material to the fixing bracket, and the structure is covered by the flexible fire-resistant covering material.

2. 2. The fire-resistant structure according to claim 1, wherein the protrusion is a male screw that is inserted into the fire-resistant covering material and fixed with a nut from the outer surface side of the fire-resistant covering material.

3. 3. The fire-resistant structure according to claim 1, wherein the fire-resistant covering material is made of a resin base material containing a thermal expansion material.

4. the fixing metal fitting has the spring portions near both ends of a main body portion, the fixing metal fitting is disposed between a pair of flange portions formed on the structure, and the spring portions are pressed against inner surfaces of the flange portions, thereby fixing the fixing metal fitting to the structure; 4. The fire-resistant structure according to claim 1, wherein the protrusion protrudes toward an outer surface of the main body.

5. The fire-resistant structure described in claim 4, characterized in that both ends of the main body portion in the width direction are bent toward where the spring portion is formed, reinforcing ribs are formed on the main body portion, and the main body portion is formed in an approximately U-shape in a cross section perpendicular to the longitudinal direction.

6. the spring portion is formed to face the main body portion of the fixing fixture, and the main body portion and the spring portion sandwich the flange portion of the structure, thereby fixing the fixing fixture to the structure, 4. The fire-resistant structure according to claim 1, wherein the protrusion protrudes toward an outer surface of the main body.

7. A construction method for a fire-resistant structure in which a fire-resistant covering material is fixed to a structure using fixing metal fittings, The fixing metal fitting has a spring portion for fixing to the flange portion of the structure and a protrusion portion protruding outward from the fixing metal fitting, and jagged teeth are formed at the tip of the spring portion to make it easier for the tip of the spring portion to bite into the flange portion, A method for constructing a fire-resistant structure, characterized in that the fixing bracket is fixed to the structure by the spring portion, the protrusion portion is inserted into the fire-resistant covering material to fix the fire-resistant covering material to the structure, and the structure is covered with the fire-resistant covering material.

8. A construction method for a fire-resistant structure in which a fire-resistant covering material is fixed to a structure using fixing metal fittings, the fixing metal fitting has a spring portion for fixing to the flange portion of the structure and a protrusion portion that protrudes outward from the fixing metal fitting, The protrusions are male screws, and the male screws are inserted into predetermined positions of the fire-resistant covering material, and the pair of fixing metal fittings are fixed to the fire-resistant covering material with nuts. A method for constructing a fire-resistant structure, characterized in that the fire-resistant covering material is fixed to the structure by using the spring portion to fix one of the fixing brackets fixed to the fire-resistant covering material to one side of the structure, wrapping the fire-resistant covering material around the structure, and fixing the other fixing bracket to the other side of the structure.

9. 9. A method for constructing a fire-resistant structure according to claim 7 or claim 8, characterized in that the protrusion is a male screw, and the male screw is inserted into the fire-resistant covering material and fixed with a nut from the outer surface side of the fire-resistant covering material.

10. A fixing bracket for fixing a fire-resistant covering material to a structure, a main body; spring portions formed near both ends of the main body portion for fixing to flange portions of a structure; a male thread portion protruding outward from the main body portion, In order to make it easier for the tip of the spring portion to bite into the flange portion, jagged teeth are formed on the tip of the spring portion, A fixing bracket characterized in that, when the fixing bracket is placed between a pair of flange portions formed on a structure, the spring portions are each pressed against the inner surfaces of the flange portions, thereby fixing the fixing bracket to the structure.

11. A fixing bracket for fixing a fire-resistant covering material to a structure, a main body; a spring portion formed opposite the main body portion and configured to be fixed to a flange portion of a structure; a male thread portion protruding outward from the main body portion, In order to make it easier for the tip of the spring portion to bite into the flange portion, jagged teeth are formed on the tip of the spring portion, A fixing bracket characterized in that when a flange portion is inserted between the spring portion and the main body portion, the flange portion is sandwiched between the main body portion and the spring portion, thereby making it possible to fix the fixing bracket to a structure.

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