Fire-resistant covering structure

Abstract

To provide a fire-resistant covering structure capable of suppressing damage to a fire-resistant covering material even if a core material of a brace is expanded and contracted during an earthquake.SOLUTION: The fireproof covering structure includes a buckling stiffening brace 16 including a core member 20 and a buckling restraining member 30 through which the core member 20 is inserted, a first dry fireproof covering member (first covering member 42) that covers the buckling restraining member 30, and a second dry fireproof covering member (second covering member 44) that covers a portion of the core member 20 that protrudes from the buckling restraining member 30 and that has an end portion that overlaps an end portion of the first dry fireproof covering member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to fire-resistant coated structures. [Background technology]

[0002] The following Patent Document 1 discloses a stiffening structure for a steel brace in which a stiffening material is attached to the steel brace. It also describes that a fire-resistant material may be installed around the stiffening material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-84795 Summary of the Invention [Problem to be solved by the invention]

[0004] Buckling-stiffening braces that resist long-term loads must be covered with fire-resistant material. If stiffening tubes are attached to the core material that forms the brace, the stiffening tubes and the parts of the core material that protrude from the stiffening tubes must also be covered with fire-resistant material. However, if the core material expands and contracts during an earthquake, stress will be generated between the parts of the fire-resistant material that cover the stiffening tubes and the rest of the material, which may damage the fire-resistant material. In such cases, repair work, for example, will be necessary.

[0005] In consideration of the above, the present invention aims to provide a fire-resistant covering structure that can prevent damage to the fire-resistant covering material even if the core material of the brace expands and contracts during an earthquake. [Means for solving the problem]

[0006] The fire-resistant coating structure of claim 1 comprises a buckling stiffening brace having a core material and a stiffening tube through which the core material is inserted, a first dry-type fire-resistant coating material covering the stiffening tube, and a second dry-type fire-resistant coating material covering the portion of the core material protruding from the stiffening tube and having an end portion overlapping the end portion of the first dry-type fire-resistant coating material.

[0007] According to the fire-resistant covering structure of claim 1, the end of the first dry-type fire-resistant covering material covering the stiffening pipe and the end of the second dry-type fire-resistant covering material covering the core material are arranged to overlap, so that the buckling stiffening brace is covered with fire-resistant material.

[0008] Furthermore, because the first dry-type fire-resistant covering material and the second dry-type fire-resistant covering material are separate components, damage to the fire-resistant covering material is suppressed even if the core material expands and contracts during an earthquake, which reduces the amount of repair work required.

[0009] The fire-resistant coating structure of claim 2 is the fire-resistant coating structure of claim 1, wherein a fire-resistant sealant is provided in the gap between the end of the first dry fire-resistant coating material and the end of the second dry fire-resistant coating material.

[0010] According to the fire-resistant covering structure of claim 2, fire is less likely to infiltrate through the gap between the first dry fire-resistant covering material and the second dry fire-resistant covering material toward the buckling stiffening brace side.

[0011] A fire-resistant covered structure according to claim 3 is the fire-resistant covered structure according to claim 1 or 2, wherein the core material is an H-shaped steel and the stiffening pipe is a square steel pipe.

[0012] According to the fire-resistant covering structure of claim 3, the outer surfaces of the H-shaped steel and square steel pipes are formed in a straight line, which makes it easier to cover them with a plate-shaped dry fire-resistant covering material compared to using a buckling stiffening brace made of cylindrical steel pipes, for example. [Effects of the Invention]

[0013] According to the present invention, a fire-resistant covering structure is provided that can suppress damage to the fire-resistant covering material even if the core material of the brace expands and contracts during an earthquake. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is an elevation view showing an example of a buckling stiffening brace to which a fire-resistant covering structure according to an embodiment of the present invention is applied. [Figure 2] 1A and 1B are cross-sectional views partially showing a fire-resistant covering structure according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line BB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, a fire-resistant covering structure according to an embodiment of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in the various drawings are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiple numbers.

[0016] Furthermore, descriptions of overlapping configurations and symbols in the drawings may be omitted. Note that the present disclosure is not limited to the following embodiments, and may be implemented by making appropriate modifications, such as omitting configurations, replacing them with different configurations, or combining one embodiment with various modified examples, within the scope of the purpose of the present disclosure.

[0017] <Fire-resistant coating structure> (Buckling stiffening brace) 1 shows a buckling stiffening brace 16 to which a fire-resistant covering structure according to an embodiment of the present invention is applied. The buckling stiffening brace 16 is a seismic reinforcement material that resists long-term loads as well as short-term loads. A fire-resistant covering material 40, which will be described later, is applied to the buckling stiffening brace 16 to prevent a decrease in strength due to fire.

[0018] The buckling stiffening brace 16 provides seismic reinforcement to the frame 10, which is composed of square steel pipe columns 12 and H-shaped steel beams 14. Stud bolts 14A are welded to the upper flanges of the beams 14. A slab concrete (not shown) is poured above the beams 14, and the stud bolts 14A are embedded in this slab concrete.

[0019] The buckling stiffening brace 16 may be used to reinforce a reinforced concrete structure or a steel-framed reinforced concrete structure against earthquakes.

[0020] The buckling stiffening brace 16 includes a core member 20 and a stiffening tube 30. The core member 20 is an H-shaped steel and is placed diagonally across the structural plane of the frame 10. As an example, the core member 20 is placed from the joint between the column 12 and the beam 14 (the lower beam 14D of the adjacent beams 14) to the center of the beam 14 (the upper beam 14U of the adjacent beams 14).

[0021] The core material 20 may be arranged arbitrarily on the structural surface of the frame 10, and may be bridged from the joint between the column 12 and the beam 14U to the center of the beam 14D, or from the joint between the column 12 and the beam 14U to the joint between the adjacent column 12 and the beam 14D.

[0022] The stiffening tube 30 is a square steel pipe through which the core material 20 is inserted. The stiffening tube 30 is a reinforcing material that is placed in the portion of the core material 20 where buckling should be suppressed, and covers at least the central portion of the core material 20 in the axial direction.

[0023] (Fireproof covering material) The fire-resistant covering material 40 is indicated by a two-dot chain line in Fig. 1. The fire-resistant covering material 40 provides fire-resistant covering to the buckling stiffening brace 16 (the core member 20 and the stiffening pipe 30).

[0024] 2(A) and 2(B), the fire-resistant coating material 40 is formed with a first coating material 42, a second coating material 44, and a sealing material 46. The first coating material 42 is an example of the first dry fire-resistant coating material of the present invention, the second coating material 44 is an example of the second dry fire-resistant coating material of the present invention, and the sealing material 46 is an example of the fire-resistant sealing material of the present invention.

[0025] The first covering material 42 is a dry fire-resistant covering material that covers the stiffening pipe 30, and is formed, for example, from calcium silicate boards. The first covering material 42 is assembled into a box shape so as to surround the stiffening pipe 30. The first covering material 42 covers the entire stiffening pipe 30. Furthermore, both ends of the first covering material 42 are disposed outside the stiffening pipe 30 in the axial direction of the core material 20.

[0026] The first covering material 42 is fixed to the stiffening pipe 30 via a base material 50. The base material 50 is formed, for example, from a lightweight steel frame, and is welded to the stiffening pipe 30, with the first covering material 42 fixed thereto with screws. Note that the method for fixing the first covering material 42 to the stiffening pipe 30 is not particularly limited.

[0027] The second covering material 44 is a dry fire-resistant covering material that covers the portion of the core material 20 that protrudes from the stiffening pipe 30, and is formed, for example, from a calcium silicate board. The first covering material 42 and the second covering material 44 are separate members. The second covering material 44 is formed by assembling them into a box shape so as to surround the core material 20. Like the first covering material 42, the second covering material 44 is also fixed to the core material 20 via a base material 50.

[0028] An end of the second covering material 44 is arranged to overlap an end of the first covering material 42. "Overlapping" refers to the existence of an overlapping portion L along the axial direction of the core material 20. In addition, in the overlapping portion L, the second covering material 44 is arranged outside the first covering material 42. In addition, in the overlapping portion L, a gap is formed between the second covering material 44 and the first covering material 42.

[0029] The sealant 46 is a sealing material filled in the gap between the second covering material 44 and the first covering material 42, and is made of a material having adhesive properties and deformation-conforming properties. For example, a wet material such as modified silicone resin is used as such a sealing material.

[0030] <Action and effect> In the fire-resistant covering structure according to the embodiment of the present invention, the end of the first covering material 42 covering the stiffening pipe 30 and the end of the second covering material 44 covering the core material 20 are arranged to overlap each other. As a result, the buckling stiffening brace 16 is covered with the fire-resistant covering material 40 over substantially the entire length.

[0031] Furthermore, the first covering material 42 and the second covering material 44 are separate members. Therefore, in the case where the core material 20 expands and contracts during an earthquake but the stiffening pipe 30 does not, damage to the fire-resistant covering material 40 is suppressed when the core material 20 and the stiffening pipe 30 are displaced relative to each other. This reduces the amount of repair work required.

[0032] Furthermore, in the fire-resistant covering structure according to the embodiment of the present invention, a sealant 46 is provided in the gap between the end of the first covering material 42 and the end of the second covering material 44. This makes it difficult for fire to penetrate through the gap between the first covering material 42 and the second covering material 44 to the buckling stiffening brace 16 side.

[0033] Furthermore, the sealing material 46 has deformation followability. Therefore, when the first covering material 42 covering the stiffening tube 30 and the second covering material 44 covering the core material 20 are displaced relative to each other, the sealing material 46 deforms. As a result, stress is less likely to be generated in the first covering material 42 and the second covering material 44, making them less likely to be damaged.

[0034] Furthermore, in the fire-resistant covering structure according to the embodiment of the present invention, the core member 20 is an H-shaped steel beam, and the stiffening tube 30 is a square steel pipe. The outer surfaces of the H-shaped steel beam and the square steel pipe are formed in a straight line. Therefore, compared to using a buckling stiffening brace made of a cylindrical steel pipe, for example, it is easier to cover with a plate-shaped dry fire-resistant covering material such as a calcium silicate plate.

[0035] <Other embodiments> In the above embodiment, the sealant 46 is provided in the gap between the end of the first covering material 42 and the end of the second covering material 44, but the present invention is not limited to this embodiment. For example, the sealant 46 does not necessarily have to be provided.

[0036] Even without providing the sealing material 46, it is possible to prevent fire from spreading to the buckling stiffening brace 16 side by increasing the length of the overlapping portion L or by reducing the gap width between the end of the first covering material 42 and the end of the second covering material 44.

[0037] In the above embodiment, the buckling stiffening brace 16 is made of an H-shaped steel core member 20 and a square steel pipe stiffening tube 30, but the present invention is not limited to this. For example, the buckling stiffening brace may be made of a brace in which a steel material is inserted into a cylindrical steel pipe and mortar is filled in the steel pipe (for example, an Unbonded Brace (registered trademark)).

[0038] Even in such a case, the same effect as that of the present invention can be obtained by covering the steel pipe and the steel material protruding from the steel pipe with separate fire-resistant members. [Explanation of symbols]

[0039] 16 Buckling stiffening brace 20 Core material 30 Stiffening tube 40 Fireproof cladding 42 First sheathing material (first dry fireproof sheathing material) 44 Second coating material (second dry fireproof coating material) 46 Sealing material (fireproof sealing material)

Claims

1. a buckling stiffening brace including a core material and a stiffening tube through which the core material is inserted; a first dry fire-resistant coating material that covers the stiffening pipe; a second dry fire-resistant covering material that covers a portion of the core material that protrudes from the stiffening pipe and has an end portion that overlaps an end portion of the first dry fire-resistant covering material; Fire-resistant coated structure.

2. A fire-resistant sealant is provided in a gap between an end of the first dry fire-resistant coating material and an end of the second dry fire-resistant coating material. The fire-resistant coated structure of claim 1.

3. The core material is an H-shaped steel, The stiffening pipe is a square steel pipe. The fire-resistant coated structure according to claim 1 or 2.

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