Structure, and method of constructing the same

Abstract

To make a fireproof board for curtain walls omissible while ensuring the fireproof performance of a steel frame member.SOLUTION: A structure 10 comprises: a curtain wall 90; a steel beam 20 that faces the curtain wall 90; a fireproof board 50 that is provided on the curtain wall 90 side of the steel beam 20 in a wall shape and fire-resistively covers the curtain wall 90 side of the steel beam 20; and an extending fire-resistant material 40 that extends from the fireproof board 50 toward the curtain wall 90 side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a structure and a construction method of the 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 with 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 with 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] Incidentally, in a curtain wall, in order to prevent fire spread to upper floors, it is common to provide a fire-resistant board (hereinafter referred to as "fire-resistant board for curtain wall") in the spandrel section. When the floor area is larger than a certain size, fire compartments are required between upper and lower floors according to the Building Standards Law. To establish fire compartments between upper and lower floors, it is necessary to install a fire-resistant cantilever slab (cantilever length of 500 mm or more) or form the spandrel section with a fire-resistant wall material (height of 900 mm or more). However, for design reasons, in most buildings, the latter is often selected. The present invention targets the case where the latter is selected. The fire-resistant board for curtain wall in the spandrel section is supported by sandwiching the four sides with mullions (vertical framing members) and transoms (horizontal framing members). If only supporting window glass, transoms only need to be provided near the floor slab. However, when installing a fire-resistant board for curtain wall in the spandrel section, transoms are also required at the lower position of the spandrel section, and the increase in the number of transoms impairs the design compared to the case without the fire-resistant board for curtain wall.

[0007] In addition, since the mullions in the spandrel section are required to have fire-resistant performance as an outer wall, it is necessary to fireproof the mullions from the indoor side. However, when the distance between the curtain wall and steel frame members such as steel beams and steel columns is narrow, it is often difficult to secure a working space and apply fireproof coating to the mullions. Similarly, for the outer wall side portions of steel frame members such as steel beams and steel columns, it is also difficult to secure a working space and apply fireproof coating.

[0008] In view of the above facts, an object of the present invention is to make it possible to omit the fire-resistant board for curtain wall while ensuring the fire-resistant performance of steel frame members.

Means for Solving the Problems

[0009] The structure according to claim 1 comprises a curtain wall, a steel frame member facing the curtain wall, a fire-resistant coating material provided in a wall shape on the curtain wall side of the steel frame member for fire-resistant coating of the curtain wall side of the steel frame member, and a protruding fire-resistant material protruding from the fire-resistant coating material toward the curtain wall side.

[0010] According to the structure according to claim 1, the steel frame member faces the curtain wall. Further, a fire-resistant coating material is provided on the curtain wall side of the steel frame member. The fire-resistant coating material is provided in a wall shape and fire-resistant coats the curtain wall side of the steel frame member.

[0011] Here, a protruding fire-resistant material protrudes from the fire-resistant coating material toward the curtain wall side. Thereby, during a fire, the flame rising between the curtain wall and the steel frame member is guided to the outdoor side of the curtain wall by the protruding fire-resistant material, so that the upward spread of fire is suppressed. That is, in the present invention, the fire-resistant coating material and the protruding fire-resistant material function as a spandrel part. Therefore, in the present invention, the fire-resistant board for the curtain wall can be omitted.

[0012] Thus, in the present invention, it is possible to omit the fire-resistant board for the curtain wall while ensuring the fire resistance performance of the steel frame member.

[0013] The structure according to claim 2 is the structure according to claim 1, wherein, when viewed from the width direction of the curtain wall, the tip of the protruding fire-resistant material in the protruding direction is close to the mullion of the curtain wall.

[0014] According to the structure according to claim 2, when viewed from the width direction of the curtain wall, the tip of the protruding fire-resistant material in the protruding direction is close to the mullion of the curtain wall. Thereby, the upward spread of fire during a fire can be further suppressed by the protruding fire-resistant material.

[0015] The structure according to claim 3 is the structure according to claim 1 or claim 2, further comprising a base material extending from the steel frame member toward the curtain wall side, wherein the fireproof coating material is supported by the base material with a space therebetween from the steel frame member.

[0016] According to the structure according to claim 3, a base material extending from the steel frame member toward the curtain wall side is provided. By this base material, the fireproof coating material is supported by the base material with a space therebetween from the steel frame member.

[0017] Thereby, the fireproof coating material can be installed without being affected by the manufacturing error (tolerance) of the steel frame member.

[0018] The structure according to claim 4 is the structure according to claim 1, wherein the distance between the curtain wall and the steel frame member is 450 mm or less.

[0019] According to the structure according to claim 4, the distance between the curtain wall and the steel frame member is 450 mm or less. In this case, since the distance between the erected curtain wall and the steel frame member is narrow and a working space cannot be secured, it becomes difficult to erect the spandrel part or fireproof the outer wall side of the steel frame member.

[0020] In such a case, the present invention is particularly effective, and by projecting the projecting fireproof material from the fireproof coating material toward the curtain wall side, it is possible to secure the fireproof performance of the steel frame member and omit the fireproof board for the curtain wall.

[0021] A construction method of the structure according to claim 5 is a construction method of a structure including a curtain wall, a steel frame member facing the curtain wall, a fireproof coating material provided in a wall shape on the curtain wall side of the steel frame member for fireproofing the curtain wall side of the steel frame member, and a projecting fireproof material projecting from the fireproof coating material toward the curtain wall side, the method comprising building the steel frame member in a state where at least the curtain wall side of the steel frame member is fireproofed with a fireproof coating material other than fireproof paint.

[0022] According to the construction method of the structure according to claim 5, the steel frame member faces the curtain wall. Further, a fireproof coating material is provided on the curtain wall side of the steel frame member. The fireproof coating material is provided in a wall shape and fireproofly coats the curtain wall side of the steel frame member.

[0023] Here, a projecting fireproof material projects from the fireproof coating material toward the curtain wall side. As a result, during a fire, the flame rising between the curtain wall and the steel frame member is guided to the outdoor side of the curtain wall by the projecting fireproof material, so that the spread of fire to upper floors is suppressed. That is, in the present invention, the fireproof coating material and the projecting fireproof material function as a spandrel part. Therefore, in the present invention, the fireproof board for the curtain wall can be omitted.

[0024] Thus, in the present invention, it is possible to omit the fireproof board for the curtain wall while ensuring the fire resistance performance of the steel frame member.

[0025] Further, at least in a state where the curtain wall side of the steel frame member is fireproofly coated with a fireproof coating material other than fireproof paint, the steel frame member is erected.

[0026] Thereby, even when the distance between the curtain wall and the steel frame member is narrow, the curtain wall side of the steel frame member can be easily fireproofly coated.

[0027] Further, by fireproofly coating the curtain wall side of the steel frame member with a fireproof coating material corresponding to the required fire resistance performance of the steel frame member, the fire resistance performance of the steel frame member can be ensured.

[0028] The construction method of the structure according to claim 6 is the construction method of the structure according to claim 5, wherein after the steel frame member is erected, the projecting fireproof material to be put out is attached to the fireproof coating material.

[0029] According to the construction method of the structure according to claim 6, after the steel frame member is erected, the projecting fireproof material to be put out is attached to the fireproof coating material.

[0030] Accordingly, in the present invention, before erecting the steel frame member, it is possible to more easily erect the steel frame member as compared with the case of attaching the cantilever refractory material to the fireproof covering material.

[0031] The construction method of the structure according to claim 7 is the construction method of the structure according to claim 6, wherein, when viewed from the width direction of the curtain wall, the tip portion in the cantilever direction of the cantilever refractory material is brought close to the side wall of the curtain wall.

[0032] According to the construction method of the structure according to claim 7, when viewed from the width direction of the curtain wall, the tip portion in the cantilever direction of the cantilever refractory material is brought close to the side wall of the curtain wall. As a result, the cantilever refractory material can further suppress the spread of fire to the upper floors during a fire.

[0033] The construction method of the structure according to claim 8 is the construction method of the structure according to any one of claims 5 to 7, wherein the fireproof covering material is supported on a base material extending from the steel frame member toward the curtain wall side in a state of being spaced apart from the steel frame member.

[0034] According to the construction method of the structure according to claim 8, the fireproof covering material is supported on a base material extending from the steel frame member toward the curtain wall side in a state of being spaced apart from the steel frame member.

[0035] As a result, the fireproof covering material can be installed without being affected by the manufacturing error (tolerance) of the steel frame member.

[0036] The construction method of the structure according to claim 9 is the construction method of the structure according to claim 5, wherein after the steel frame member is erected, a portion of the steel frame member that is not fireproof covered with the fireproof covering material is fireproof covered with the post-erection fireproof covering material.

[0037] According to the construction method of the structure according to claim 9, after the steel frame members are erected, the portions 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.

[0038] 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 the steel frame member is erected, the steel frame member can be erected more easily.

Effect of the Invention

[0039] As described above, according to the present invention, while ensuring the fire resistance performance of the steel frame member, it is possible to omit the fireproof board for the curtain wall. In addition, the fireproof coating of the spandrel part becomes unnecessary, improving the workability, and the joint for supporting the lower part of the fireproof board for the curtain wall becomes unnecessary, improving the designability of the building. Further, even when the distance between the curtain wall and the steel frame member is narrow, it is possible to easily fireproof-coat the outer wall side of the steel frame member while ensuring the fire resistance performance.

Brief Description of the Drawings

[0040]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0041] Hereinafter, an embodiment will be described with reference to the drawings.

[0042] (Structure) In FIG. 1, the outer peripheral portion of the structure 10 according to the present embodiment is shown. The structure 10 is composed of a plurality of layers. This structure 10 includes a steel frame beam 20, a slab 30, and a curtain wall 90. Note that the steel frame beam 20 is an example of a steel frame member.

[0043] (Steel Frame Beam) The steel frame beam 20 is an outer peripheral steel frame beam arranged along the outer peripheral portion 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.

[0044] The steel frame beam 20 is arranged along the end portion of the slab 30 described later and supports the end portion of the slab 30. A composite fire-resistant structure described later is applied to this steel frame beam 20.

[0045] (Slab) The slab 30 is made of reinforced concrete and forms the floor of a predetermined floor of the structure 10 composed of a plurality of floors. Also, the slab 30 is provided on the steel frame beam 20 and fire-resistant coats the upper surface 20U of the steel frame beam 20. A curtain wall 90 is provided on the outdoor side (arrow OUT side) of these steel frame beams 20 and the slab 30. Note that the slab 30 is an example of a building body.

[0046] (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.

[0047] The plurality of mullions 92 and transoms 94 are made of aluminum, for example. The plurality of mullions 92 are erected at intervals in the horizontal direction and are supported by the building frame such as the slab 30 or the steel frame beam 20 via mullion brackets and fasteners (not shown).

[0048] An interlayer sealant 102 such as rock wool is provided between the curtain wall 90 and the end of the slab 30. By this interlayer sealant 102, the inflow of hot air and flames from the space between the curtain wall 90 and the end of the slab 30 to the upper floor of the slab 30 is suppressed during a fire.

[0049] Here, the distance D between the curtain wall 90 and the steel frame beam 20 is, for example, 450 mm or less. When the distance D between the curtain wall 90 and the steel frame beam 20 is narrow, a composite fire-resistant coating structure that utilizes the fire-resistant board (hereinafter referred to as the "fire-resistant board for curtain wall") constituting the spandrel part of the curtain wall 90 as a part of the fire-resistant coating of the steel frame beam 20 may be applicable. However, even when the distance D between the curtain wall 90 and the steel frame beam 20 is narrow, for example, when the lower end of the fire-resistant board for curtain wall is located above the lower surface 20L of the steel frame beam 20, it may not be possible to apply the composite fire-resistant coating structure.

[0050] Also, even when the distance D between the curtain wall 90 and the steel frame beam 20 is narrow, depending on the fire-resistant performance of the fire-resistant board for curtain wall, it may not be possible to satisfy the required fire-resistant performance of the steel frame beam 20.

[0051] Therefore, in this embodiment, instead of a synthetic fireproof coating structure, the steel beam 20 is fireproof coated by a composite fireproof coating structure using a fireproof board 50.

[0052] (Composite fireproof coating structure) The composite fireproof coating structure according to this embodiment has a fireproof board 50 that fireproof coats the curtain wall 90 side of the steel beam 20, and a wrapped fireproof coating material 80 that fireproof coats the sides of the steel beam 20 other than the curtain wall 90 side. The wrapped fireproof coating material 80 is formed of heat-resistant rock wool, ceramic fiber wool, alkali silicate wool, etc., and is fastened to the steel beam by welding fixing pins or the like.

[0053] Note that the upper surface 20U of the steel beam 20 is fireproof coated by the slab 30. Also, the fireproof board 50 is an example of a fireproof coating material (fireproof coating material before construction). Further, the wrapped fireproof coating material 80 is an example of a fireproof coating material after construction.

[0054] The fireproof board 50 is formed of, for example, calcium silicate board, gypsum board (including reinforced gypsum board), ALC panel, metal heat insulation sandwich panel, steel plate fireproof coated (coated with spray rock wool, heat-resistant rock wool, thermally foaming fireproof sheet, etc.), and has fireproof performance as an outer wall (heat insulation for 30 minutes (if not on the fire spread line) or 1 hour (if on the fire spread line) or more against heating from the outdoor side) and fireproof performance of 3 hours or more (non-damage and fire shielding property) as a fireproof coating material for the steel beam 20. The fireproof board 50 is not limited to using the above materials alone, and it is also possible to use a combination of multiple materials, and it is also possible to enhance the fireproof performance by fireproof coating the fireproof board 50.

[0055] Note that the fireproof board 50 only needs to have fireproof performance corresponding to the required fireproof performance of the steel beam 20, and the fireproof performance as a fireproof coating material for the steel beam 20 is not limited to 3 hours or more, and may be less than 3 hours.

[0056] The fireproof board 50 is provided in a wall shape on the curtain wall 90 side of the steel frame beam 20, and its outer surface 50A faces the curtain wall 90. This fireproof board 50 is arranged from the upper end to the lower end of the steel frame beam 20, and fireproofly covers the entire surface 20A on the curtain wall 90 side of the steel frame beam 20.

[0057] Specifically, the fireproof board 50 is arranged from the end face of the upper flange portion 22 of the steel frame beam 20 to the end face of the lower flange portion 24, 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 curtain wall 90 side.

[0058] Note that the surface 20A on the curtain wall 90 side of the steel frame beam 20 is a concept including the lower surface and end face on the curtain wall 90 side of the upper flange portion 22, the upper surface and end face on the curtain wall 90 side of the lower flange portion 24, and the surface on the curtain wall 90 side of the web portion 26.

[0059] The upper end of the fireproof board 50 reaches the lower surface of the slab 30. Also, the lower end of the fireproof board 50 extends downward beyond the steel frame beam 20. This fireproof board 50 is attached to the upper flange portion 22 and the lower flange portion 24 of the steel frame beam 20 via the upper base material 52 and the lower base material 54.

[0060] Note that an overhanging fireproof material 40 is provided at the lower end of the fireproof board 50. Also, as will be described later, the fireproof board 50 is attached to the steel frame beam 20 before the construction of the steel frame beam 20.

[0061] (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 frame 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 frame 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 the upper base material 52 by a plurality of screws 56.

[0062] 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 frame 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 frame 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 the lower base material 54 by a plurality of screws 56.

[0063] 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 the upper base materials 52 and the lower base materials 54 may be provided at intervals in the material axis direction of the steel frame beam 20.

[0064] (Wound fireproof coating material) The wound fireproof coating material 80 is constructed after the steel frame beam 20 is erected. This wound fireproof coating material 80 fireproof-coats the entire surface of the 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.

[0065] 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.

[0066] The wound fireproof covering material 80 reaches the inner surface 50B of the fireproof board 50 on the lower side of the steel beam 20. Note that the covering thickness of the wound fireproof covering material 80 is set, for example, to ensure fireproof performance for 3 hours or more.

[0067] Note that the wound fireproof covering material 80 only needs to have 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.

[0068] (Overhanging fireproof material) The overhanging fireproof material 40 is a guiding fireproof material that guides the flame rising between the curtain wall 90 and the steel beam 20 to the outdoor side of the curtain wall 90 during a fire. This overhanging fireproof material requires fireproof performance equivalent to that of the fireproof board 50 and is formed of the same material as the fireproof board 50 such as calcium silicate board, gypsum board (including reinforced gypsum board), etc.

[0069] Note that the overhanging fireproof material 40 is not limited to the fireproof board and may be sprayed rock wool sprayed on a base material such as lath, or a wound fireproof covering material attached to the base material.

[0070] The overhanging fireproof material 40 is arranged substantially horizontally along the material axis direction of the steel beam 20 and protrudes from the lower end of the fireproof board 50 toward the curtain wall 90 side. One end (base end) 40E1 of this overhanging fireproof material 40 is fixed to the lower end of the fireproof board 50 by screws 42 in a state of abutting against the outer surface 50A of the lower end of the fireproof board 50.

[0071] Note that the overhanging fireproof material 40 is not limited to the lower end of the fireproof board 50 and may be fixed, for example, to a part above the lower end of the fireproof board 50. Further, the overhanging fireproof material 40 is not limited to the screws 42 and may be fixed to the fireproof board 50 by other fixing members such as clips.

[0072] The tip (the other end) 40E2 in the protruding direction of the protruding refractory 40 is close to the mullion 92 when viewed from the width direction of the curtain wall 90 (the material axis direction of the steel frame beam 20). The space between the curtain wall 90 and the steel frame beam 20 is blocked by the protruding refractory 40 and the refractory board 50.

[0073] Note that when viewed from the width direction of the curtain wall 90, the tip 40E2 of the protruding refractory 40 being close to the mullion 92 of the curtain wall 90 means that the gap between the tip 40E2 of the protruding refractory 40 and the mullion 92 is a gap such that flames do not rise from the gap during a fire. As an example, it is set to 10 mm or less.

[0074] Also, the protruding refractory 40 is set such that the distance T between its lower surface and the lower surface of the slab 30 is a predetermined value or more so as to function as a spandrel part of the curtain wall 90 together with the refractory board 50. In this embodiment, as an example, the distance between the lower surface of the protruding refractory 40 and the lower surface of the slab 30 is 900 mm or more. Note that when the upper surface of the refractory board 50 is in close contact with the lower surface of the slab 30, or even if there is a slight gap and appropriate measures are taken with rock wool or a sealing material, the slab thickness can be considered as the height of the spandrel part. In this case, the distance between the lower surface of the protruding refractory 40 and the upper surface of the slab 30 can also be set to 900 mm or more.

[0075] (Construction method of the structure) Next, an example of the construction method of the structure according to this embodiment will be described.

[0076] (Pre - construction fire - resistant coating process) First, in the pre - construction fire - resistant coating process, on the curtain - wall 90 side of the steel frame beam 20, at a factory or a site yard, etc., fire - resistant coating is performed with the refractory board 50.

[0077] Specifically, first, as shown in FIG. 2, on the curtain wall 90 side of the steel beam 20, an upper base material 52 is joined to the end face of the upper flange portion 22 by welding or the like, and a lower base material 54 is joined to the end face of the lower flange portion 24 by welding or the like.

[0078] Next, as shown in FIG. 3, a fireproof board 50 is disposed on the curtain wall 90 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 curtain wall 90 side of the steel beam 20 is fireproof-coated by the fireproof board 50.

[0079] (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 (curtain wall 90 side).

[0080] (Slab construction process) Next, in the slab construction process, a slab 30 is constructed on the steel beam 20. The slab 30 is constructed by a well-known construction method.

[0081] (Outer wall construction process) Next, in the outer wall construction process, a curtain wall 90 is constructed on the outdoor side of the steel beam 20 and the slab 30, and the curtain wall 90 and the steel beam 20 are opposed to each other. The curtain wall 90 is supported by the steel beam 20 and the slab 30 via a base material (not shown), for example. The curtain wall 90 is constructed by a well-known construction method.

[0082] (Overhanging fireproof material construction process) Next, as shown in FIG. 1, in the process of installing the protruding refractory material, the protruding refractory material 40 is attached to the refractory board 50. Specifically, the protruding refractory material 40 is disposed substantially horizontally between the lower end of the refractory board 50 and the curtain wall 90, and one end 40E1 of the protruding refractory material 40 is abutted against the outer surface 50A of the lower end of the refractory board 50. In this state, a plurality of screws 42 are screwed into one end 40E1 of the protruding refractory material 40 from the inner surface 50B side of the lower end of the refractory board 50.

[0083] Thereby, one end 40E1 of the protruding refractory material 40 is fixed to the lower end of the refractory board 50, and the protruding refractory material 40 is held in a state of protruding from the lower end of the refractory board 50 toward the curtain wall 90 side. Further, when viewed in the width direction of the curtain wall 90, the tip 40E2 of the protruding refractory material 40 is close to the partition 92.

[0084] (Refractory coating process after building erection) Next, in the refractory coating process after building erection, the portions of the steel beam 20 not covered by the refractory board 50, that is, the indoor side surface 20B and the lower surface 20L side of the erected steel beam 20 are covered with a wound refractory coating material 80 for refractory coating.

[0085] Specifically, the wound refractory coating material 80 is attached so as to cover the entire indoor side surface 20B and the lower surface 20L of the steel beam 20. At this time, the wound refractory coating material 80 is fastened to the lower surface 20L of the steel beam 20 with a welding fixing pin or the like so that no gap is formed between the inner surface 50B of the refractory board 50 and the wound refractory coating material 80.

[0086] Thereby, the steel beam 20 is covered with refractory by the composite refractory structure of the refractory board 50 and the wound refractory coating material 80.

[0087] Note that the above construction procedure can be changed as appropriate. For example, the refractory coating process after building erection may be performed before the process of installing the protruding refractory material, or may be performed in parallel with the process of installing the protruding refractory material and the refractory coating process after building erection.

[0088] In addition, the protruding refractory 40 may be attached to the refractory board 50 before the steel frame beam 20 is erected.

[0089] (Function and effect) Next, the function and effect of the present embodiment will be described.

[0090] The curtain wall 90 is composed of a frame formed by the mullions 92 and the transoms 94, and the window glass 96 is supported by this frame. Here, as shown in FIG. 10, in the curtain wall 90 according to the comparative example, in order to prevent the upward spread of fire during a fire, a fire-resistant board 100 for curtain wall having fire-resistant performance is installed between the spandrel parts of the curtain wall 90, specifically, between the upper transom 94A and the lower transom 94B. The fire-resistant board 100 for curtain wall is fixed from all four sides with the mullions 92 on the left and right, the transom 94A on the upper side, and the transom 94B on the lower side. Since the mullions in the spandrel part are required to have fire-resistant performance as an outer wall, it is necessary to attach a fire-resistant coating material (not shown) to the indoor side of the mullion (the side facing the steel frame beam 20). Thus, in the curtain wall 90 according to the comparative example, in order to provide the fire-resistant board 100 for curtain wall in the spandrel part, it is necessary to attach the lower transom 94B to the lower side of the spandrel part and fire-resistant coat the indoor side part of the mullion 92. The designability of the building appearance is impaired because the lower transom 94B enters the curtain wall 90 to support the fire-resistant board 100 for curtain wall. Also, the steel frame beams 20 around the outer wall are often arranged at positions close to the outer wall. This is because the steel frame beams 20 around the outer wall bear the weight of the curtain wall 90, and it is more structurally reasonable for the steel frame beams 20 to be closer to the outer wall. For this reason, it is difficult to obtain a sufficient working space and fire-resistant coat the indoor side part of the mullion 92 and the outer wall side part of the steel frame beam 20. By the way, in order to avoid this situation, a method of fire-resistant coating the steel frame beam 20 before installing the curtain wall 90 is also conceivable. However, in order to fire-resistant coat the outer wall side part of the steel frame beam 20 without the curtain wall 90, it is necessary to install a scaffold facing the outside, and since it involves dangerous work, it is often postponed from being adopted. Also, when using spray-on rock wool as the fire-resistant coating material, measures to prevent scattering to the outside during spraying are required, and when using a wrapped fire-resistant coating material, if it rains between the completion of the fire-resistant coating construction and the installation of the curtain wall 90, the wrapped fire-resistant coating material absorbs water and expands, resulting in quality problems. Due to such problems, it is common to perform the fire-resistant coating construction of the steel frame beam 20 after the installation of the curtain wall 90 is completed.For this reason, the distance between the curtain wall 90 and the steel frame beam 20 becomes narrow, and it is very often difficult to fireproof the indoor side portion of the buttress 92 and the outdoor side portion of the steel frame beam 20. On the contrary, as shown in FIG. 1, according to the present embodiment, the steel frame beam 20 faces the curtain wall 90. Further, a fireproof board 50 is provided on the curtain wall 90 side of the steel frame beam 20. The fireproof board 50 is provided in a wall shape and fireproofs the curtain wall 90 side of the steel frame beam 20.

[0091] Here, the projecting fireproof material 40 projects from the fireproof board 50 toward the curtain wall 90 side. As a result, as shown in FIG. 5, at the time of a fire, the flame F rising between the curtain wall 90 and the steel frame beam 20 is guided to the outdoor side of the curtain wall 90 by the projecting fireproof material 40, so that the spread of fire to upper floors is suppressed. That is, in the present embodiment, the fireproof board 50 and the projecting fireproof material 40 function as a spandrel part. Therefore, in the present embodiment, the fireproof board 100 for curtain wall (see FIG. 10) can be omitted.

[0092] As described above, in the present embodiment, while ensuring the fireproof performance of the steel frame member, the fireproof board 100 for curtain wall can be omitted. Further, fireproofing of the buttress 92 of the spandrel part becomes unnecessary, and workability is improved. Further, since the seamless part 94B that supports the fireproof board 100 for curtain wall from below becomes unnecessary, the designability of the structure 10 can be improved by omitting the lower seamless part 94B. Note that the lower seamless part 94B also has an effect of reducing the out-of-plane deformation of the buttress 92 during strong winds. Therefore, depending on design conditions such as building height, floor height, and installation interval of the buttress 92, if it is more reasonable in terms of cost or the like to provide the lower seamless part 96B, the lower seamless part 94B may be installed.

[0093] Further, in the present embodiment, as described above, at the time of a fire, the flame rising between the curtain wall 90 and the steel frame beam 20 is guided to the outdoor side of the curtain wall 90 by the projecting fireproof material 40. Therefore, the interlayer blocking material 102 can be omitted, and workability is improved.

[0094] Further, in the present embodiment, when viewed from the width direction of the curtain wall 90, the tip portion 40E2 in the protruding direction of the protruding refractory 40 is close to the parapet 92 of the curtain wall 90. Thereby, the protruding refractory 40 can further suppress the spread of fire to the upper floor during a fire.

[0095] Furthermore, in the present embodiment, the distance between the curtain wall 90 and the steel frame beam 20 is set to 450 mm or less. In this case, since the distance between the attached curtain wall 90 and the steel frame beam 20 is narrow and there is no working space, it becomes difficult to fireproof the indoor side portion of the parapet 92 and the outer wall side portion of the steel frame beam 20.

[0096] In such a case, the present embodiment is particularly effective. By projecting the protruding refractory 40 from the fireproof board 50 toward the curtain wall 90, it is possible to omit the fireproof board 100 for the curtain wall while ensuring the fire resistance performance of the steel frame beam 20. As a result, fireproof coating of the indoor side portion of the parapet 92 in the spandrel portion becomes unnecessary, and the workability is improved.

[0097] Also, according to the construction method of the structure according to the present embodiment, as described above, with the curtain wall 90 side of the steel frame beam 20 fireproof-coated with the fireproof board 50, the steel frame beam 20 is erected.

[0098] Thereby, even when the distance D between the curtain wall 90 and the steel frame beam 20 is narrow, the curtain wall 90 side of the steel frame beam 20 can be easily fireproof-coated. After the curtain wall 90 is attached, there is no need to fireproof the curtain wall 90 side of the steel frame beam 20 without sufficient working space, and the workability is improved.

[0099] Also, by fireproof-coating the curtain wall 90 side of the steel frame beam 20 with the fireproof board 50 corresponding to the required fire resistance performance of the steel frame beam 20, the fire resistance performance of the steel frame beam 20 can be ensured.

[0100] In addition, in the present embodiment, after the steel frame beam 20 is erected, in the overhanging refractory material construction process, the overhanging refractory material 40 is attached to the refractory board 50. Thereby, compared with the case where the overhanging refractory material 40 is attached to the refractory board 50 before the steel frame beam 20 is erected, the steel frame beam 20 can be erected more easily.

[0101] Further, in the present embodiment, after the steel frame beam 20 is erected, the portions of the steel frame beam 20 not fire - covered by the refractory board 50, that is, the indoor - side surface 20B and the lower - surface 20L side of the erected steel frame beam 20, are fire - covered by the wrapping refractory material 80.

[0102] Thereby, in the present embodiment, for example, compared with the case where the entire steel frame beam 20 is fire - covered by the refractory board 50 and then the steel frame beam 20 is erected, the steel frame beam 20 can be erected more easily.

[0103] (Modification example) Next, a modification example of the above - described embodiment will be described.

[0104] In the above - described embodiment, one end portion 40E1 of the overhanging refractory material 40 is fixed to the lower end portion of the refractory board 50 by the screw 42 in a state where it abuts against the outer surface 50A of the lower end portion of the refractory board 50. However, for example, as in the modification example shown in FIG. 6, the fixing portion between the lower end portion of the refractory board 50 and one end portion 40E1 of the overhanging refractory material 40 may be reinforced by a reinforcing member 44.

[0105] The reinforcing member (reinforcing metal fitting) 44 is formed, for example, in an L - shaped cross - section and is arranged along the corner portion between the lower end portion of the refractory board 50 and one end portion 40E1 of the overhanging refractory material 40. This reinforcing member 44 is fixed to the lower end portion of the refractory board 50 and one end portion 40E1 of the overhanging refractory material 40 by screws 42, respectively.

[0106] By thus reinforcing the fixing portion between the lower end portion of the refractory board 50 and one end portion 40E1 of the overhanging refractory material 40 with the reinforcing member 44, the detachment etc. of one end portion 40E1 of the overhanging refractory material 40 are suppressed.

[0107] In the above-described embodiment, one end portion 40E1 of the protruding refractory 40 abuts against the outer surface 50A of the lower end portion of the refractory board 50. However, the protruding refractory 40 may be fixed to the lower end portion of the refractory board 50 with screws or the like in a state where its upper surface abuts against the lower end surface of the refractory board 50.

[0108] In the above-described 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.

[0109] For example, in the modified example shown in FIG. 7, 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.

[0110] 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 an example of a base material.

[0111] 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.

[0112] In addition, the upper base material 70 extends from the steel frame beam 20 toward the curtain wall 90 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 curtain wall 90 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 refractory board 50 is fixed to this other base portion 70B with a plurality of screws 56.

[0113] 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.

[0114] Further, the lower base material 72 extends from the steel frame beam 20 toward the curtain wall 90 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 curtain wall 90 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 this other base portion 72B by a plurality of screws 56.

[0115] 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 curtain wall 90 side. Thereby, the curtain wall 90 side of the steel frame beam 20 can be fireproof-coated with 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.

[0116] Further, 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 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 74.

[0117] Note that 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.

[0118] In the above-described embodiment, the post-erection fireproof covering material is the wound fireproof covering material 80. However, the post-erection fireproof covering material is not limited to the wound fireproof covering material 80, and for example, sprayed rock wool, formed fireproof covering materials (such as calcium silicate boards, gypsum boards, ALC panels, etc.), ceramic fireproof covering materials, thermally expandable fireproof sheets, fireproof paints, etc. may also be used.

[0119] As an example, in the modified example shown in FIG. 8, the post-erection fireproof covering material is the sprayed rock wool 60. 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 in the steel frame beam 20 (the arrow IN side, the indoor side), and the lower surface 20L of the steel frame beam 20.

[0120] Also, the post-erection fireproof covering material may be a fireproof covering material of the same type as the fireproof board 50, that is, a fireproof board. In this case, the steel frame beam 20 has a general fireproof covering structure instead of a composite fireproof covering.

[0121] In the above-described embodiment, the fireproof board 50 as the fireproof covering material (pre-erection fireproof covering material) only fireproofly covers the curtain wall 90 side of the steel frame beam 20. However, the fireproof board 50 only needs to fireproofly cover at least the curtain wall 90 side of the steel frame beam 20 before the steel frame beam 20 is erected. For example, the lower surface 20L of the steel frame beam 20 and the surface 20B on the indoor side may also be fireproofly covered.

[0122] 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, a wall-shaped wound fireproof covering material may also be used. In this case, the wound fireproof covering material is provided, for example, along a wall-shaped base material supported by the upper base material 52 and the lower base material 54. Also, the protruding fireproof material 40 is attached to, for example, the wound fireproof covering material and its base material.

[0123] In the above-described 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 shown in the modification example of FIG. 9.

[0124] The steel frame column 110 is formed of a square steel pipe as an example and faces the curtain wall 90. The side of the steel frame column 110 on the curtain wall 90 side is fireproof-coated with a fireproof board 120. The fireproof 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.

[0125] In addition, a projecting fireproof material 40B is attached to the fireproof board 120. The projecting fireproof material 40B is formed of, for example, a fireproof board or the like and projects from the fireproof board 120 toward the curtain wall 90 side. The projecting fireproof material 40B may extend horizontally from the fireproof board 120 toward the curtain wall 90 side, or may be attached to the left and right edges of the fireproof board 120 like the projecting fireproof material 40C. In either case, the projecting fireproof materials 40B and 40C of the steel frame column 110 need to be attached without a gap to the projecting fireproof material 40 of the steel frame beam 20. When a slight gap occurs, the gap should be appropriately treated with rock wool or a sealing material so that flames do not leak from the gap during a fire.

[0126] As a result, during a fire, the flames rising between the curtain wall 90 and the steel frame column 110 are guided to the outdoor side of the curtain wall 90 by the projecting fireproof material 40, so that the spread of fire to upper floors is suppressed. That is, in the present embodiment, the fireproof board 50 and the projecting fireproof material 40 function as a spandrel part. Therefore, in the present embodiment, the fireproof board 100 for the curtain wall can be omitted.

[0127] Thus, in this modification example, as in the above-described embodiment, it is possible to omit the fireproof board for the curtain wall while ensuring the fire resistance performance of the steel frame member.

[0128] In addition, the part of the steel column 110 that is not fire - covered by the fire - resistant board 120 is fire - covered by the sprayed rock wool 130 after the steel column 110 is erected. That is, the sprayed rock wool 130 fire - covers the side surfaces 110S2, 110S3, and 110S4 of the steel column 110 other than the side surface 110S1 on the curtain wall 90 side.

[0129] Note that the fire - resistant board 120 is an example of a fire - covering material (pre - erection fire - covering material). Also, the sprayed rock wool 130 is an example of a post - erection fire - covering material.

[0130] The pair of base materials 122 are formed in an L - shaped cross - section like an L - shaped steel (angle) or the like, and are arranged with the material axis direction of the steel column 110 as the longitudinal direction. Also, each base material 122 has a pair of base portions 122A and 122B.

[0131] The pair of base materials 122 are attached to the side surfaces 110S2 and 110S3 on both sides of the steel column 110 via the 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, respectively. One base portion 122A of the base material 122 is joined to this disposable plate 124 in a state where it is overlapped, by welding or the like.

[0132] Also, the pair of base materials 122 extend from the steel column 110 toward the curtain wall 90 side. Specifically, one base portion 122A of each base material 122 extends from the steel column 110 toward the curtain wall 90 side. From the tip of the extending direction of this one base portion 122A, the other base portion 122B extends in the width direction of the curtain wall 90. The fire - resistant board 120 is fixed to this other base portion 122B by a plurality of screws 126.

[0133] Here, in this modified example, the fireproof board 120 is supported at a distance from the steel column 110 by a pair of base materials 122 that respectively extend from the steel column 110 toward the curtain wall 90 side. Thereby, the curtain wall 90 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.

[0134] Also, at a factory or the like, by pre-welding the disposable plates 124 to the steel column 110, for example, at the site, the upper base material 52 and the lower base material 54 can be welded to these disposable plates 124.

[0135] 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.

[0136] In the embodiment described with reference to FIG. 1, the fire-resistant board 50 is attached with the projecting fire-resistant material 40, thereby omitting the fire-resistant board 100 for curtain wall. Along with this, it is also possible to omit the lower joint 94B. Although it is not necessary for fire resistance performance, as shown in FIG. 10, the fire-resistant board 100 for curtain wall may be installed in the spandrel part. Since equipment ducts, pipes, electric wires, etc. are arranged around the steel frame beam 20, the fire-resistant board 100 for curtain wall is installed in the spandrel part to make these invisible from the outside. Since the fire resistance performance as an outer wall is ensured by the fire-resistant board 50 and the projecting fire-resistant material 40, the fire-resistant board 100 for curtain wall may not have the fire resistance performance as an outer wall, and it may be designed in terms of design and structural performance (strength and rigidity against forces generated during strong winds). Since the parapet 92 of the spandrel part also does not require the fire resistance performance as an outer wall, the fire coating does not have to be attached. In the embodiment of FIG. 1, since the fire-resistant board 50 and the projecting fire-resistant material 40 are visible from the outside, designability is required for the fire-resistant board 50 and the projecting fire-resistant material 40. For this reason, it is basically required to use a formed fire coating material such as a calcium silicate board for the fire-resistant board 50 and the projecting fire-resistant material 40. However, in the modification example of FIG. 10, since the fire-resistant board 50 and the projecting fire-resistant material 40 are not visible from the outside due to the fire-resistant board 100 for curtain wall, the fire coating material can be selected without considering designability. As a result, for example, it becomes possible to use a wall material or the like in which the fire-resistant board 50 and the projecting fire-resistant material 40 are attached with sprayed rock wool or wound fire coating material on an iron plate base. Thereby, rationality can be obtained in terms of cost and the like.

[0137] As described above, an embodiment of the present invention has been explained. However, the present invention is not limited to such embodiments, and one embodiment and various modification examples 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 Signs

[0138] 10 Structure 20 Steel frame beam (steel frame member) 40 Projecting fire-resistant material 50 Fireproof board (fireproof coating material) 60 Sprayed rock wool (fireproof coating material after construction) 70 Upper base material (base material) 72 Lower base material (base material) 80 Wrapped fireproof coating material (fireproof coating material after construction) 90 Curtain wall 100 Fireproof board for curtain wall 110 Steel column (steel member) 120 Fireproof board (fireproof coating material) 122 Base material 130 Sprayed rock wool (fireproof coating material after construction)

Claims

1. A curtain wall, a steel frame member facing the curtain wall, a fireproof coating material provided in a wall shape on the curtain wall side of the steel frame member to fireproof coat the curtain wall side of the steel frame member, and a projecting fireproof material projecting from the fireproof coating material toward the curtain wall side. A structure comprising these components.

2. When viewed from the width direction of the curtain wall, the tip portion of the projecting fireproof material in the projecting direction is close to the side elevation of the curtain wall. The structure according to Claim 1.

3. Comprising a base material extending from the steel frame member toward the curtain wall side, wherein the fireproof coating material is supported by the base material with a space from the steel frame member. The structure according to Claim 1 or Claim 2.

4. The distance between the curtain wall and the steel frame member is 450 mm or less. The structure according to Claim 1.

5. A construction method for a structure comprising a curtain wall, a steel frame member facing the curtain wall, a fireproof coating material provided in a wall shape on the curtain wall side of the steel frame member to fireproof coat the curtain wall side of the steel frame member, and a projecting fireproof material projecting from the fireproof coating material toward the curtain wall side, the method comprising: erecting the steel frame member in a state where at least the curtain wall side of the steel frame member is fireproof coated with a fireproof coating material other than fireproof paint; A construction method for a structure.

6. After erecting the steel frame member, attaching the projecting fireproof material to the fireproof coating material. The construction method for a structure according to Claim 5.

7. When viewed from the width direction of the curtain wall, bringing the tip portion of the projecting fireproof material in the projecting direction close to the side elevation of the curtain wall. The construction method for a structure according to Claim 6.

8. Supporting the fireproof coating material on the base material extending from the steel frame member toward the curtain wall side with a space from the steel frame member. The construction method for a structure according to any one of Claims 5 to 7.

9. After erecting the steel frame member, fireproof coating the portion of the steel frame member that is not fireproof coated with the fireproof coating material with a fireproof coating material after erection. The construction method for a structure according to Claim 5.

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