Method of constructing structure, and structure

Abstract

To fire-resistively cover an outer wall side of a steel frame member easily while ensuring fireproof performance even when a gap between an outer wall and the steel member is narrow.SOLUTION: In a method of constructing a structure that has an outer wall 40 and a steel beam 20 facing the outer wall 40, the steel beam 20 is constructed with at least an outer wall 40 side of the steel beam 20 fire-resistively covered with a fireproof board for CW.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a construction method of a structure and a structure.

Background Art

[0002] A composite fire-resistant structure is known in which a fire-resistant board constituting an outer wall or a spandrel part of a curtain wall is used as part of the fire protection of a steel beam or the like (see, for example, Patent Documents 1 to 3).

[0003] In addition, a composite fire-resistant coating structure in which a steel beam is fire-protected by a fire-resistant paint and a wrap-around type fire-resistant coating material is known (see, for example, Patent Document 4).

[0004] Furthermore, a composite fire-resistant coating structure in which a steel column is fire-protected by a dry-type fire-resistant coating material and a semi-wet type fire-resistant coating material is known (see, for example, Patent Document 5).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, when the distance between the outer wall and steel frame members such as steel beams and steel columns is narrow, it becomes difficult to secure a working space for fireproof coating the outer wall side of the steel frame members. In such a case, for example, before constructing the outer wall, it is necessary to fireproof coat the outer wall side of the steel beam, which takes time in construction.

[0007] As a countermeasure, for example, it is conceivable to apply a composite fireproof coating structure to the steel frame members. In the composite fireproof structure, by using the outer wall as a part of the fireproof coating of the steel frame members, even when the distance between the outer wall and the steel frame members is narrow, the outer wall side of the steel frame members can be fireproof coated.

[0008] However, the composite fireproof coating structure needs to obtain fireproof structure certification and be applied within the scope of the obtained certification conditions. Therefore, depending on the design conditions of the outer wall and steel frame members, etc., it may not be possible to apply the composite fireproof coating structure.

[0009] Also, even when the composite fireproof coating structure can be applied, depending on the fireproof performance of the outer wall, it may not satisfy the fireproof performance required for the steel frame members.

[0010] In consideration of the above facts, an object of the present invention is to easily fireproof coat the outer wall side of a steel frame member while ensuring fireproof performance even when the distance between the outer wall and the steel frame member is narrow.

Means for Solving the Problem

[0011] The construction method of the structure according to claim 1 is a construction method of a structure including an outer wall and a steel frame member facing the outer wall, and the steel frame member is erected in a state where at least the outer wall side of the steel frame member is fireproof coated with a fireproof coating material other than fireproof paint.

[0012] According to the construction method of the structure according to claim 1, the steel frame member is erected in a state where at least the outer wall side of the steel frame member is fireproof coated with a fireproof coating material other than fireproof paint.

[0013] Accordingly, even when the distance between the outer wall and the steel frame member is narrow, the outer wall side of the steel frame member can be easily fireproof coated.

[0014] Also, by fireproof coating the outer wall side of the steel frame member with a fireproof coating material according to the required fireproof performance of the steel frame member, the fireproof performance of the steel frame member can be ensured.

[0015] Thus, in the present invention, even when the distance between the outer wall and the steel frame member is narrow, the outer wall side of the steel frame member can be easily fireproof coated while ensuring the fireproof performance.

[0016] The construction method of the structure according to claim 2 is the construction method of the structure according to claim 1, wherein the fireproof coating material is supported on a base material extending from the steel frame member to the outer wall side in a state of being spaced apart from the steel frame member.

[0017] According to the construction method of the structure according to claim 2, the fireproof coating material is supported on a base material extending from the steel frame member to the outer wall side in a state of being spaced apart from the steel frame member. Accordingly, the outer wall side of the steel frame member can be fireproof coated with the fireproof coating material without being affected by the manufacturing error (tolerance) of the steel frame member.

[0018] The construction method of the structure according to claim 3 is the construction method of the structure according to claim 1, wherein the distance between the outer wall and the steel frame member is set to 450 mm or less.

[0019] According to the construction method of the structure according to claim 3, the distance between the outer wall and the steel frame member is set to 450 mm or less. In this case, it becomes difficult to secure a working space for fireproof coating the outer wall side of the steel frame member.

[0020] In such a case, the present invention is particularly effective, and by building the steel frame member in a state where at least the outer wall side of the steel frame member is fireproof coated with a fireproof coating material other than fireproof paint, the outer wall side of the steel frame member can be easily fireproof coated while ensuring the fireproof performance.

[0021] The construction method of the structure according to claim 4 is the construction method of the structure according to any one of claims 1 to 3, wherein after the steel frame members are erected, the parts of the steel frame members that are not fireproof-coated with the fireproof coating material are fireproof-coated with the fireproof coating material after erection.

[0022] According to the construction method of the structure according to claim 4, after the steel frame members are erected, the parts of the steel frame members that are not fireproof-coated with the fireproof coating material are fireproof-coated with the fireproof coating material after erection.

[0023] Thereby, in the present invention, for example, compared with the case where the entire steel frame member is fireproof-coated with the fireproof coating material and then the steel frame member is erected, the steel frame member can be more easily erected.

[0024] The structure according to claim 5 includes an outer wall, a steel frame member facing the outer wall, a base material extending from the steel frame member toward the outer wall side, and a fireproof coating material supported by the base material with a space between the steel frame member and the fireproof coating material for fireproof-coating the outer wall side of the steel frame member.

[0025] According to the structure according to claim 5, the steel frame member faces the outer wall. Further, the base material extends from the steel frame member toward the outer wall side. The fireproof coating material is supported by the base material. The fireproof coating material is supported by the base material with a space between the steel frame member and the fireproof coating material for fireproof-coating the outer wall side of the steel frame member.

[0026] Here, by erecting the steel frame member in a state where the outer wall side of the steel frame member is fireproof-coated with the fireproof coating material, even when the distance between the outer wall and the steel frame member is narrow, the outer wall side of the steel frame member can be easily fireproof-coated.

[0027] In addition, by fireproof-coating the outer wall side of the steel frame member with a fireproof coating material according to the required fire resistance performance of the steel frame member, the fire resistance performance of the steel frame member can be ensured.

[0028] Thus, in the present invention, even when the distance between the outer wall and the steel frame member is narrow, it is possible to easily fireproof the outer wall side of the steel frame member while ensuring fire resistance performance.

[0029] Furthermore, by supporting the fireproof coating material at a distance from the steel frame member on the base material extending from the steel frame member to the outer wall side, it is possible to fireproof the outer wall side of the steel frame member with the fireproof coating material without being affected by the manufacturing error (tolerance) of the steel frame member.

Advantages of the Invention

[0030] As described above, according to the present invention, even when the distance between the outer wall and the steel frame member is narrow, it is possible to easily fireproof the outer wall side of the steel frame member while ensuring fire resistance performance.

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0032] Hereinafter, an embodiment will be described with reference to the drawings.

[0033] (Structure) FIG. 1 shows the outer periphery of the structure 10 according to this embodiment. The structure 10 is composed of multiple layers. This structure 10 includes a steel frame beam 20, a slab 30, and an outer wall 40. Note that the steel frame beam 20 is an example of a steel frame member.

[0034] (Steel Frame Beam) The steel frame beam 20 is an outer peripheral steel frame beam arranged along the outer periphery of the structure 10. Also, the steel frame beam 20 is formed of H-shaped steel. This steel frame beam 20 has an upper flange portion 22 and a lower flange portion 24 that face each other in the vertical direction, and a web portion 26 that connects the upper flange portion 22 and the lower flange portion 24.

[0035] The steel frame beam 20 is arranged along the end of the slab 30 described later and supports the end of the slab 30. A composite fire-resistant structure described later is applied to this steel frame beam 20.

[0036] (Slab) The slab 30 is made of reinforced concrete and forms the floor of a predetermined floor of the structure 10 composed of multiple floors. Also, the slab 30 is provided on the steel frame beam 20 and fireproofs the upper surface 20U of the steel frame beam 20. An outer wall 40 is provided on the outdoor side (arrow OUT side) of these steel frame beams 20 and the slab 30.

[0037] Note that the slab 30 is an example of a building body.

[0038] (Outer Wall) The outer wall 40 is arranged across the upper and lower floors of the slab 30 and constitutes the exterior of the structure 10. This outer wall 40 is formed, for example, of precast concrete panels, ALC panels, extruded cement panels (ECP), etc.

[0039] Between the outer wall 40 and the end of the slab 30, an interlayer blocking material 32 such as rock wool is provided. By this interlayer blocking material 32, the inflow of hot air and flames from the space between the fireproof board 50 and the end of the slab 30 to the upper floor of the slab 30 is suppressed during a fire.

[0040] Here, the distance D between the outer wall 40 and the steel frame beam 20 is, for example, 450 mm or less. When the distance D between the outer wall 40 and the steel frame beam 20 is narrow like this, a composite fireproof coating structure that uses the outer wall 40 as part of the fireproof coating of the steel frame beam 20 may be applicable. However, even when the distance D between the outer wall 40 and the steel frame beam 20 is narrow, for example, when the lower end of the outer wall 40 is located above the lower surface 20L of the steel frame beam 20, it may not be possible to apply the composite fireproof coating structure.

[0041] Also, even when the distance D between the outer wall 40 and the steel frame beam 20 is narrow, depending on the fireproof performance of the outer wall 40, it may not be possible to satisfy the required fireproof performance of the steel frame beam 20. For example, when the outer wall 40 is formed of an extruded cement plate (ECP), it is difficult to ensure a fireproof performance of 3 hours or more in the composite fireproof coating structure. The reason is as follows.

[0042] That is, the extruded cement plate has a plurality of hollow parts inside. Since this extruded cement plate has a thin wall thickness and plate thickness (thickness excluding the hollow parts from the wall thickness), when it is heated for 2 hours or more, cracks and fissures are significantly generated. As a result, heat enters the hollow part of the extruded cement plate from the cracks and fissures, and the temperature of the steel frame beam 20 rises. Therefore, as described above, it is difficult to ensure a fireproof performance of 3 hours or more.

[0043] Therefore, in the present embodiment, the steel frame beam 20 is fireproof coated by a composite fireproof coating structure using a fireproof board 50 different from the outer wall 40 instead of the composite fireproof coating structure.

[0044] (Composite fireproof coating structure) The composite fireproof coating structure according to this embodiment has a fireproof board 50 that fireproofly coats the outer wall 40 side of the steel beam 20 and a sprayed rock wool 60 that fireproofly coats the parts other than the outer wall 40 side of the steel beam 20.

[0045] Note that the upper surface 20U of the steel beam 20 is fireproofly coated by the slab 30. Also, the fireproof board 50 is an example of a fireproof coating material (pre-construction fireproof coating material). Further, the sprayed rock wool 60 is an example of a post-construction fireproof coating material.

[0046] The fireproof board 50 is attached to the steel beam 20 before constructing the steel beam 20. Also, the fireproof board 50 is formed by, for example, calcium silicate board, gypsum board (including reinforced gypsum board), rock wool board, ceramic fiber board, alkali earth silicate board, thermally foaming fireproof sheet, etc., and can ensure a fireproof performance of 3 hours or more. The fireproof board 50 is not limited to being pre-processed into a plate shape, and it is also possible to use a plate-shaped base material such as an iron plate with a fireproof coating material such as heat-resistant rock wool or alkali earth silicate blanket pasted on it. Also, the fireproof board 50 is not limited to using the above materials alone, and a plurality of materials can be bonded and used.

[0047] Note that the fireproof board 50 only needs to have a fireproof performance corresponding to the required fireproof performance of the steel beam 20, and the fireproof performance is not limited to 3 hours or more and may be less than 3 hours.

[0048] The fireproof board 50 is provided in a wall shape on the outer wall 40 side of the steel beam 20, and its outer surface 50A faces the inner surface 40B of the outer wall 40. This fireproof board 50 is arranged from the upper end to the lower end of the steel beam 20, and fireproofly coats the entire surface 20A on the outer wall 40 side of the steel beam 20.

[0049] Specifically, the fireproof board 50 is disposed across from the end face of the upper flange portion 22 to the end face of the lower flange portion 24 of the steel beam 20, and fireproofly covers the end faces of the upper flange portion 22 and the lower flange portion 24 and the surface of the web portion 26 from the outer wall 40 side.

[0050] Note that the surface 20A on the outer wall 40 side of the steel beam 20 is a concept including the lower surface and end face on the outer wall 40 side of the upper flange portion 22, the upper surface and end face on the outer wall 40 side of the lower flange portion 24, and the surface on the outer wall 40 side of the web portion 26.

[0051] The upper end portion of the fireproof board 50 reaches the lower surface of the slab 30. Further, the lower end portion of the fireproof board 50 extends downward beyond the steel beam 20. This fireproof board 50 is attached to the upper flange portion 22 and the lower flange portion 24 of the steel beam 20 via the upper base material 52 and the lower base material 54.

[0052] (Upper base material, lower base material) The upper base material 52 is formed of a metal plate such as a flat steel plate (flat bar) as an example, and is arranged with the material axis direction of the steel beam 20 as the longitudinal direction. Further, the upper base material 52 extends downward from the end face of the upper flange portion 22 of the steel beam 20, and is joined by welding or the like in a state where its upper end portion is overlapped with the end face of the upper flange portion 22. The upper end portion of the fireproof board 50 is fixed to this upper base material 52 by a plurality of screws 56.

[0053] The lower base material 54 is formed of a metal plate such as a flat steel plate (flat bar) as an example, and is arranged with the material axis direction of the steel beam 20 as the longitudinal direction. Further, the lower base material 54 extends upward from the end face of the lower flange portion 24 of the steel beam 20, and is joined by welding or the like in a state where its lower end portion is overlapped with the end face of the lower flange portion 24. The lower portion of the fireproof board 50 is fixed to this lower base material 54 by a plurality of screws 56.

[0054] Note that the upper base material 52 and the lower base material 54 are pre-attached to the end faces of the upper flange portion 22 and the lower flange portion 24 of the steel frame beam 20 in a factory or the like. Further, a plurality of upper base materials 52 and lower base materials 54 may be provided at intervals in the material axis direction of the steel frame beam 20.

[0055] (Sprayed rock wool) The sprayed rock wool 60 is constructed after the steel frame beam 20 is erected. This sprayed rock wool 60 fireproofly covers the entire surface 20B on the side opposite to the fireproof board 50 (arrow IN side, indoor side) of the steel frame beam 20 and the lower surface 20L of the steel frame beam 20.

[0056] Note that the indoor side surface 20B of the steel frame beam 20 is a concept including the lower surface and end face on the indoor side of the upper flange portion 22, the upper surface and end face on the indoor side of the lower flange portion 24, and the indoor side surface of the web portion 26.

[0057] The sprayed rock wool 60 reaches the inner surface 50B of the fireproof board 50 on the lower side of the steel frame beam 20. Further, the covering thickness of the sprayed rock wool 60 is set to ensure a fire resistance performance of, for example, 3 hours or more.

[0058] Note that the sprayed rock wool 60 only needs to have a fire resistance performance corresponding to the required fire resistance performance of the steel frame beam 20, and the fire resistance performance is not limited to 3 hours or more and may be less than 3 hours.

[0059] (Construction method of structure) Next, an example of the construction method of the structure according to the present embodiment will be described.

[0060] (Fireproof coating process before erection) First, in the fireproof coating process before erection, on the outer wall 40 side of the steel frame beam 20, it is fireproofly coated with the fireproof board 50 in a factory, a site yard, or the like.

[0061] Specifically, first, as shown in FIG. 2, on the outer wall 40 side of the steel beam 20, the upper base material 52 is joined to the end face of the upper flange portion 22 by welding or the like, and the lower base material 54 is joined to the end face of the lower flange portion 24 by welding or the like.

[0062] Next, as shown in FIG. 3, the fireproof board 50 is disposed on the outer wall 40 side of the steel beam 20, and the fireproof board 50 is fixed to the upper base material 52 and the lower base material 54 with screws 56, respectively. Thereby, the outer wall 40 side of the steel beam 20 is fireproof coated by the fireproof board 50.

[0063] (Steel member erection process) Next, as shown in FIG. 4, in the steel member erection process, the steel beam 20 with the fireproof board 50 attached is lifted by a hoist or the like (not shown) and erected at a predetermined position of the structure 10. At this time, the steel beam 20 is erected so that the fireproof board 50 faces the outdoor side (outer wall 40 side).

[0064] (Slab construction process) Next, in the slab construction process, the slab 30 is constructed on the steel beam 20. The slab 30 is constructed by a well-known construction method.

[0065] (Outer wall construction process) Next, in the outer wall construction process, the outer wall 40 is constructed on the outdoor side of the steel beam 20 and the slab 30, and the outer wall 40 is opposed to the steel beam 20. The outer wall 40 is supported by the steel beam 20 and the slab 30 via a base material (not shown), for example. The outer wall 40 is constructed by a well-known construction method.

[0066] (Fireproof coating process after erection) Next, as shown in FIG. 1, in the fireproof coating process after erection, the portions of the steel beam 20 not fireproof coated by the fireproof board 50, that is, the indoor surface 20B and the lower surface 20L side of the erected steel beam 20 are fireproof coated with sprayed rock wool 60.

[0067] Specifically, spray-on rock wool 60 is sprayed over the entire indoor surface 20B and the entire lower surface 20L of the steel beam 20 with a predetermined coating thickness. At this time, the spray-on rock wool 60 is sprayed onto the lower surface 20L of the steel beam 20 so that no gap is formed between the inner surface 50B of the fireproof board 50 and the spray-on rock wool 60.

[0068] As a result, the steel beam 20 is fireproof-coated by the composite fireproof structure of the fireproof board 50 and the spray-on rock wool 60.

[0069] (Function and effect) Next, the function and effect of this embodiment will be described.

[0070] As described above, according to the construction method of the structure according to this embodiment, in the process of building the steel member, the steel beam 20 is built with the outer wall 40 side of the steel beam 20 fireproof-coated by the fireproof board 50.

[0071] Thereby, even when the distance D between the outer wall 40 and the steel beam 20 is narrow, the outer wall 40 side of the steel beam 20 can be easily fireproof-coated.

[0072] In addition, by fireproof-coating the outer wall 40 side of the steel beam 20 with the fireproof board 50 according to the required fireproof performance of the steel beam 20, the fireproof performance of the steel beam 20 can be ensured.

[0073] Thus, in this embodiment, even when the distance D between the outer wall 40 and the steel beam 20 is narrow, the outer wall 40 side of the steel beam 20 can be easily fireproof-coated while ensuring the fireproof performance.

[0074] In addition, in this embodiment, the distance D between the outer wall 40 and the steel beam 20 is set to 450 mm or less. In this case, it becomes difficult to secure a working space for fireproof-coating the outer wall 40 side of the steel beam 20.

[0075] In such a case, the present embodiment is particularly effective. By erecting the steel frame beam 20 in a state where the outer wall 40 side of the steel frame beam 20 is fireproof coated with the fireproof board 50, it is possible to easily fireproof coat the outer wall 40 side of the steel frame beam 20 while ensuring the fireproof performance.

[0076] Furthermore, in the present embodiment, even when the outer wall 40 is formed of an extruded cement board, by fireproof coating the steel frame beam 20 with the composite fireproof structure of the fireproof board 50 and the sprayed rock wool 60, it is possible to ensure a fireproof performance of 3 hours or more.

[0077] Also, in the present embodiment, in the post-erection fireproof coating process, after erecting the steel frame beam 20, the portions of the steel frame beam 20 that are not fireproof coated with the fireproof board 50, that is, the indoor side surface 20B and the lower surface 20L side of the erected steel frame beam 20 are fireproof coated with the sprayed rock wool 60.

[0078] Thereby, in the present embodiment, for example, compared with the case where the entire steel frame beam 20 is fireproof coated with the fireproof board 50 and then the steel frame beam 20 is erected, the steel frame beam 20 can be more easily erected.

[0079] (Modification example) Next, a modification example of the above embodiment will be described.

[0080] In the above embodiment, the upper base material 52 and the lower base material 54 are formed of flat steel plates (flat bars). However, the upper base material 52 and the lower base material 54 are not limited to flat steel plates.

[0081] For example, in the modification example shown in FIG. 5, the upper base material 70 and the lower base material 72 are formed in an L-shaped cross section such as an L-shaped steel (angle), and are arranged with the material axis direction of the steel frame beam 20 as the longitudinal direction.

[0082] The upper base material 70 has a pair of base portions 70A and 70B, and the lower base material 72 has a pair of base portions 72A and 72B. Note that the upper base material 70 and the lower base material 72 are examples of base materials.

[0083] The upper base material 70 is attached to the lower surface of the upper flange portion 22 of the steel frame beam 20 via a disposable plate 74. The disposable plate 74 is formed of a metal plate such as a flat steel plate and is welded to the lower surface of the upper flange portion 22 of the steel frame beam 20 in a factory or the like. One base portion 70A of the upper base material 70 is joined to the disposable plate 74 by welding or the like in a state where it is overlapped.

[0084] Further, the upper base material 70 extends from the steel frame beam 20 toward the outer wall 40 side. Specifically, one base portion 70A of the upper base material 70 extends from the upper flange portion 22 of the steel frame beam 20 toward the outer wall 40 side. Further, the other base portion 70B extends downward from the tip portion in the extending direction of one base portion 70A. The upper end portion of the fireproof board 50 is fixed to the other base portion 70B by a plurality of screws 56.

[0085] The lower base material 72 is attached to the upper surface of the lower flange portion 24 of the steel frame beam 20 via a disposable plate 74. The disposable plate 74 is formed of a metal plate such as a flat steel plate and is welded to the upper surface of the lower flange portion 24 of the steel frame beam 20 in a factory or the like. One base portion 72A of the lower base material 72 is joined to the disposable plate 74 by welding or the like in a state where it is overlapped.

[0086] Further, the lower base material 72 extends from the steel frame beam 20 toward the outer wall 40 side. Specifically, one base portion 72A of the lower base material 72 extends from the lower flange portion 24 of the steel frame beam 20 toward the outer wall 40 side. Further, the other base portion 72B extends upward from the tip portion in the extending direction of one base portion 72A. The lower portion of the fireproof board 50 is fixed to the other base portion 72B by a plurality of screws 56.

[0087] Here, in this modified example, the fireproof board 50 is supported at a distance from the steel frame beam 20 by the upper base material 52 and the lower base material 54 that respectively extend from the upper flange portion 22 and the lower flange portion 24 of the steel frame beam 20 toward the outer wall 40 side. Thereby, the outer wall 40 side of the steel frame beam 20 can be fireproof-coated by the fireproof board 50 without being affected by the manufacturing errors (tolerances) of the upper flange portion 22 and the lower flange portion 24 of the steel frame beam 20.

[0088] Also, in a factory or the like, by pre-welding the disposable plates 74 to the upper flange portion 22 and the lower flange portion 24 of the steel frame beam 20, for example, at the site, the upper base material 52 and the lower base material 54 can be welded to these disposable plates 74. It is also possible to pre-weld and fix the upper base material 70 and the lower base material 72 in a factory or the like. When the upper base material 70 and the lower base material 72 are not welded at the site, the disposable plates 74 are not necessary and may be omitted.

[0089] Note that a plurality of the upper base material 52 and the lower base material 54 may be provided at intervals in the material axis direction of the steel frame beam 20.

[0090] Also, in the above embodiment, the post-construction fireproof coating material is the sprayed rock wool 60. However, the post-construction fireproof coating material is not limited to the sprayed rock wool 60, and may be, for example, a wound fireproof coating material (such as heat-resistant rock wool), a molded fireproof coating material (calcium silicate board, gypsum board, ALC panel, etc.), a ceramic fireproof coating material, a thermally foaming fireproof sheet, a fireproof paint, or the like.

[0091] As an example, in the modified example shown in FIG. 6, the post-construction fireproof coating material is the wound fireproof coating material 80. The wound fireproof coating material 80 is formed of heat-resistant rock wool, ceramic wool, alkali earth silicate wool, etc. formed in a sheet shape. This wound fireproof coating material 80 is attached to the steel frame beam 20 by the welding fixing pins 82.

[0092] In addition, the post-erection fireproof covering material may be the same type of fireproof covering material as the fireproof board 50, i.e., it may also be a fireproof board. In this case, the steel frame beam 20 will have a general fireproof covering structure instead of a composite fireproof covering.

[0093] Also, in the above-described embodiment, the fireproof covering material (pre-erection fireproof covering material) is the wall-shaped fireproof board 50. However, the fireproof covering material is not limited to the wall-shaped fireproof board 50, and for example, it may also be a wall-shaped wrapped fireproof covering material or a thermally expandable fireproof sheet. In this case, the wrapped fireproof covering material is provided, for example, along the wall-shaped base material supported by the upper base material 52 and the lower base material 54. When the dimensions of the beam deflection are large, the distance between the upper base material 52 and the lower base material 54 increases, so there is a higher possibility that the fireproof covering material will fall off due to thermal degradation under fire heating. To enhance the performance of preventing the fireproof covering material from falling off, a grid-shaped steel plate base connecting the upper base material 52 and the lower base material 54 is installed at regular intervals (for example, an interval of about 300 mm or less), fixed to the upper base material 52 and the lower base material 54 by welding or the like, and the wrapped fireproof covering material or the thermally expandable fireproof sheet may be fastened to the grid-shaped plate base with screws or fixing pins. By reducing the fastening interval, it is possible to prevent the fireproof covering material from falling off during a fire and obtain the effect of enhancing the fire resistance performance.

[0094] Also, the fireproof covering material (pre-erection fireproof covering material) is not limited to the wall-shaped fireproof board 50. The fireproof covering material may be any fireproof covering material other than fireproof paint. For example, it may be a wrapped fireproof covering material provided along the surface 20A on the outer wall 40 side of the steel frame beam 20, or sprayed rock wool, etc.

[0095] Also, in the above-described embodiment, the fireproof board 50 as the fireproof covering material (pre-erection fireproof covering material) only fireproofs the outer wall 40 side of the steel frame beam 20. However, the fireproof board 50 only needs to fireproof at least the outer wall 40 side of the steel frame beam 20 before erecting the steel frame beam 20. For example, the lower surface 20L of the steel frame beam 20 or the inner surface 20B may also be fireproofed.

[0096] In the above-described embodiment, the outer wall 40 is formed of precast concrete panels or extruded cement panels. However, the outer wall 40 only needs to have fire resistance as an outer wall. For example, like the modification shown in FIG. 7, a curtain wall 90 to which a fire-resistant board 100 for curtain wall constituting a spandrel part is attached may be used.

[0097] (Curtain Wall) The curtain wall 90 is arranged across the upper and lower floors of the slab 30 and constitutes the outer wall (exterior finish) of the structure 10. This curtain wall 90 includes a plurality of mullions 92 and transoms 94 connected in a grid pattern, and window glass 96 provided within the grid frame formed by these mullions 92 and transoms 94.

[0098] The plurality of mullions 92 and transoms 94 are made of aluminum as an example. The plurality of mullions 92 are erected at intervals in the horizontal direction and are supported by a building frame such as the slab 30 or the steel frame beam 20 via mullion brackets and fasteners (not shown).

[0099] (Fire-resistant Board for Curtain Wall) The fire-resistant board for curtain wall (hereinafter referred to as "CW fire-resistant board") 100 is attached to the indoor side of the curtain wall 90 in a state facing the window glass 96 and constitutes the spandrel part of the curtain wall 90. The outer peripheral part of this CW fire-resistant board 100 is held by a frame-shaped holding part (rail part) (not shown) provided along the mullions 92 and transoms 94.

[0100] Note that the CW fire-resistant board 100 is supported by the slab 30 or the steel frame beam 20 via a support member (not shown).

[0101] In addition, the fire-resistant board 100 for CW is arranged on the outdoor side of the slab 30 across the upper and lower floors of the slab 30, and is arranged at an interval from the end of the slab 30. An interlayer blocking material 102 such as rock wool is provided between the fire-resistant board 100 for CW and the end of the slab 30. By this interlayer blocking material 32, the inflow of hot air and flames from the space between the fire-resistant board 100 for CW and the end of the slab 30 to the upper floor of the slab 30 is suppressed during a fire.

[0102] The curtain wall 90 with the fire-resistant board 100 for CW attached in this way may constitute the outer wall of the structure 10.

[0103] In the above embodiment, the steel frame member is the steel frame beam 20. However, the steel frame member is not limited to the steel frame beam 20, and may be, for example, a steel frame column 110 as in the modification shown in FIG. 8.

[0104] The steel frame column 110 is formed of a square steel pipe as an example and faces the outer wall 40. The side of the steel frame column 110 on the outer wall 40 side is fire-resistant coated with a fire-resistant board 120. The fire-resistant board 120 is attached to the steel frame column 110 via a pair of base materials 122 before the steel frame column 110 is erected.

[0105] On the other hand, the part of the steel frame column 110 that is not fire-resistant coated by the fire-resistant board 120 is fire-resistant coated with sprayed rock wool 130 after the steel frame column 110 is erected. That is, the sprayed rock wool 130 fire-resistant coats the side surfaces 110S2, 110S3, and 110S4 other than the side surface 110S1 on the outer wall 40 side of the steel frame column 110.

[0106] Note that the fire-resistant board 120 is an example of a fire-resistant coating material (fire-resistant coating material before erection). Also, the sprayed rock wool 130 is an example of a fire-resistant coating material after erection.

[0107] The pair of base materials 122 are formed in an L-shaped cross-section like an L-shaped steel (angle), etc., and are arranged with the material axis direction of the steel column 110 as the longitudinal direction. Each base material 122 has a pair of base portions 122A and 122B.

[0108] The pair of base materials 122 are attached to the side surfaces 110S2 and 110S3 on both sides of the steel column 110 via disposable plates 124. The disposable plates 124 are formed of a metal plate such as a flat steel plate, and are welded to the side surfaces 110S2 and 110S3 on both sides of the steel beam 20 in a factory or the like. One base portion 122A of the base material 122 is joined to this disposable plate 124 in a state of being overlapped, by welding or the like.

[0109] Also, the pair of base materials 122 extend from the steel column 110 toward the outer wall 40 side. Specifically, one base portion 122A of each base material 122 extends from the steel column 110 toward the outer wall 40 side. From the tip portion in the extending direction of this one base portion 122A, the other base portion 122B extends in the width direction of the outer wall 40. A fireproof board 120 is fixed to this other base portion 122B by a plurality of screws 126.

[0110] Here, in this modification example, the fireproof board 120 is supported at a distance from the steel column 110 by the pair of base materials 122 that respectively extend from the steel column 110 toward the outer wall 40 side. Thereby, the outer wall 40 side of the steel column 110 can be fireproof-coated by the fireproof board 120 without being affected by the manufacturing error (tolerance) of the steel column 110.

[0111] Also, by pre-welding the disposable plates 124 to the steel column 110 in a factory or the like, for example, at the site, the upper base material 52 and the lower base material 54 can be welded to these disposable plates 124.

[0112] Note that a plurality of base materials 122 may be provided at intervals in the material axis direction of the steel column 110. Also, the steel column 110 is not limited to a square steel pipe, and may be, for example, a round steel pipe, an H-shaped steel, or the like.

[0113] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

Explanation of reference numerals

[0114] 10 Structure 20 Steel frame beam (steel frame member) 40 Outer wall 60 Sprayed rock wool (fireproof covering material after construction) 70 Upper base material (base material) 72 Lower base material (base material) 80 Wrapped fireproof covering material (fireproof covering material after construction) 90 Curtain wall (outer wall) 110 Steel frame column (steel frame member) 120 Fireproof board 122 Base material 130 Sprayed rock wool (fireproof covering material after construction)

Claims

1. A construction method for a structure comprising an outer wall and a steel frame member facing the outer wall, comprising: erecting the steel frame member with at least the outer wall side of the steel frame member fire-coated with a fire coating material other than a fire-resistant paint; A construction method for a structure.

2. supporting the fire coating material on a base material extending from the steel frame member to the outer wall side with a space between the steel frame member and the fire coating material; The construction method for a structure according to Claim 1.

3. The distance between the outer wall and the steel frame member is set to 450 mm or less; The construction method for a structure according to Claim 1.

4. after erecting the steel frame member, fire-coating the part of the steel frame member not fire-coated with the fire coating material after erection with a fire coating material; The construction method for a structure according to any one of Claims 1 to 3.

5. An outer wall, a steel frame member facing the outer wall, a base material extending from the steel frame member to the outer wall side, a fire coating material supported by the base material with a space between the steel frame member and the fire coating material and fire-coating the outer wall side of the steel frame member; A structure comprising.

Images