Fire-resistant body support structure and synthetic fire-resistant covering structure

Abstract

To improve the workability of a fireproof board.SOLUTION: The fireproof board support structure includes: a steel beam 10; a fireproof board 70 disposed on the outdoor side of the steel beam 10; and a support member 80 supported by the steel beam 10 and including a lower end hook portion 84 holding the lower end portion of the fireproof board 70, and a base portion 82 extending upward from the lower end hook portion 84 along an inner surface 70A of the fireproof board 70 on the side of the steel beam 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant board support structure. [Background technology]

[0002] BACKGROUND ART A fire-resistant board support structure is known in which a fire-resistant board provided on a curtain wall is supported on a skeleton such as a beam or a slab (see, for example, Patent Documents 1 to 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-173379 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-202353 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-001646 [Patent Document 4] Japanese Patent Application Laid-Open No. 2006-291621 Summary of the Invention [Problem to be solved by the invention]

[0004] In the fireproof board support structure, it is desirable to improve the ease of installation of the fireproof board.

[0005] In consideration of the above, an object of the present invention is to improve the workability of fire-resistant boards. [Means for solving the problem]

[0006] According to the first aspect The fire-resistant board support structure comprises a main body, a fire-resistant board placed on the outdoor side of the main body, a lower end hook portion that holds the lower end of the fire-resistant board, and a base portion that extends upward from the lower end hook portion along the inner surface of the fire-resistant board facing the main body, and a support member supported by the main body.

[0007] First aspect According to the fire-resistant board support structure, a fire-resistant board is disposed on the exterior side of a building frame. The fire-resistant board is supported on the building frame via a support member. The support member has a lower end hook portion and a base portion.

[0008] The lower hook portion holds the lower end of the fire-resistant board. The base portion extends upward from the lower hook portion along the inner surface of the fire-resistant board facing the building frame. This base portion prevents the fire-resistant board from tilting toward the building frame, thereby preventing the fire-resistant board from falling off in the event of a fire.

[0009] Furthermore, the support member can be easily attached to the fire-resistant board, which improves the workability of the fire-resistant board.

[0010] According to the second aspect The fireproof board support structure is According to the first aspect In the fireproof board support structure, the base portion is fastened to the fireproof board with screws.

[0011] Second aspect According to the fire-resistant board support structure, the base portion is fastened to the fire-resistant board with a screw. This allows the fire-resistant board to be supported by the lower end hook portion and the base portion. This further reduces the risk of the fire-resistant board falling off in the event of a fire.

[0012] According to the third aspect The fireproof board support structure includes a frame, a fireproof board disposed on the exterior side of the frame, a lower end hook portion for holding the lower end of the fireproof board, and a front end hook portion extending from the lower end hook portion. The fire-resistant board is provided with a base portion extending upward along the inner surface of the fire-resistant board facing the main body, and a side end hook portion provided on the base portion for holding the side end of the fire-resistant board, and a support member supported by the main body.

[0013] Third aspectAccording to the fire-resistant board support structure, a fire-resistant board is placed on the exterior side of a building frame. The fire-resistant board is supported on the building frame via a support member. The support member has a bottom hook portion, a base portion, and side hook portions.

[0014] The lower hook portion holds the lower end of the fire-resistant board, and the base portion extends upward from the lower hook portion along the inner surface of the fire-resistant board facing the building frame. This base portion prevents the fire-resistant board from tilting toward the building frame.

[0015] Furthermore, the base portion is provided with side edge hook portions. The side edge hook portions hold the side edges of the fire-resistant board. These side edge hook portions prevent the fire-resistant board from tilting toward the outside of the room, thereby preventing the fire-resistant board from falling off in the event of a fire.

[0016] Furthermore, the support member can be easily attached to the fire-resistant board, which improves the workability of the fire-resistant board.

[0017] According to the fourth aspect The fireproof board support structure is First aspect ~ Third aspect Any one of pertaining to one The fire-resistant board support structure comprises a support member arranged along the side edge of the fire-resistant board, a support member side fastener provided on the support member, and a support member body side fastener provided on the main body and bolted to the support member side fastener, the support member having an attachment portion extending from the base portion toward the support member side and bolted to the main body side fastener.

[0018] Fourth aspect According to the fire-resistant board support structure, the mullions are arranged along the side edges of the fire-resistant boards. The mullions are provided with mullion-side fasteners. The mullion-side fasteners are bolted to body-side fasteners provided on the body. As a result, the mullions are supported on the body via the mullion-side fasteners and body-side fasteners.

[0019] The support member also has an attachment portion. By bolting this attachment portion to the body-side fastener, the fire-resistant board is supported on the body via the support member, the mullion-side fastener, and the body-side fastener. In other words, the mullion and the support member are supported on the body via the body-side fastener.

[0020] This improves the ease of installation of the fire-resistant board compared to when the uprights and support members are supported on the main body via separate fasteners. Furthermore, for example, by fastening the mounting parts of the upright brackets and support members together with bolts to the main body fasteners, the ease of installation of the fire-resistant board is further improved.

[0021] According to the fifth aspect The fireproof board support structure is First aspect ~ Fourth aspect Any one of pertaining to one The fire-resistant board support structure comprises a pair of support members spaced apart in the width direction of the fire-resistant board, and horizontal connecting members arranged along the inner surface of the fire-resistant board and connecting the base portions of the pair of support members.

[0022] Fifth aspect According to the fire-resistant board support structure of the present invention, a pair of support members are arranged at a distance from each other in the width direction of the fire-resistant board. By supporting the fire-resistant board with the pair of support members, the fire-resistant board is further prevented from falling off in the event of a fire.

[0023] The bases of the pair of support members are connected by horizontal ties that are placed along the inner surface of the fire-resistant board, which increases the rigidity of the pair of support members and prevents twisting of the pair of support members, further preventing the fire-resistant board from falling off in the event of a fire.

[0024] According to the sixth aspect In the composite fire-resistant covering structure, the fire-resistant board is placed on the side of the steel beam that constitutes the frame. First aspect ~ Fifth aspect Any one of pertaining to oneThe structure comprises a fire-resistant board support structure, and a fire-resistant covering material that provides fire-resistant covering to the side and underside of the steel beam opposite the fire-resistant board and seals the gap between the steel beam and the fire-resistant board.

[0025] Sixth Aspect According to the composite fire-resistant coated structure, the fire resistance performance of the steel beams can be efficiently improved by fire-coating the steel beams with the fire-resistant board and the fire-resistant coating material.

[0026] According to the seventh aspect In the composite fire-resistant covering structure, the fire-resistant board is placed on the side of the steel beam that constitutes the frame. According to the fifth aspect The structure comprises a fire-resistant board support structure, a wrapped fire-resistant covering material that extends from the opposite side of the fire-resistant board on the steel beam, passing under the steel beam, toward the fire-resistant board, with the protruding tip overlapping the metal cross-connector, and a welded fixing pin that penetrates the tip of the wrapped fire-resistant covering material and has the tip welded to the cross-connector.

[0027] Seventh aspect According to the composite fire-resistant covering structure, the fire-resistant boards are arranged on the sides of the steel beams that make up the framework. The metal horizontal ties are arranged along the inner surfaces of the fire-resistant boards on the steel beam side, connecting the bases of the pair of support members.

[0028] Here, the leading end of the beam-side wrapped fire-resistant covering material, which passes under the steel beam from the side opposite the fire-resistant board and protrudes toward the fire-resistant board, is overlapped on the horizontal tie. A welding fixing pin is passed through the leading end of the beam-side wrapped fire-resistant covering material. The leading end of this welding fixing pin is welded to the horizontal tie, thereby fixing the leading end of the beam-side wrapped fire-resistant covering material to the horizontal tie.

[0029] As a result, the space between the steel beam and the fireproof board is filled with the beam-side fireproof covering material, and the steel beam is fireproof covered (composite fireproof covering) by the beam-side fireproof covering material and the fireproof board, thereby improving the fire resistance of the steel beam.

[0030] In addition, in the present invention, the leading ends of the beam-side wrapped fire-resistant covering material are fixed to the horizontal ties with welded fixing pins, which reduces damage to the fire-resistant board and improves workability compared to, for example, fixing the leading ends of the beam-side wrapped fire-resistant covering material to the fire-resistant board with screws.

[0031] According to the eighth aspect Synthetic fire-resistant coating structures are According to the seventh aspect In a composite fire-resistant coated structure, the horizontal ties are electrically connected to the steel beams via the support members.

[0032] Eighth aspect In the composite fire-resistant coated structure, the horizontal tie members are electrically connected to the steel beams via the support members, so that when the tip of the weld fixing pin is welded to the horizontal tie members, an earth can be attached to the steel beams or the steel columns joined to the steel beams.

[0033] Therefore, for example, first, while attaching a ground wire to the steel beam or steel column, the beam-side wrapped fire-resistant covering material can be fixed to the steel beam with a welding fixing pin, and then the tip side of the beam-side wrapped fire-resistant covering material can be fixed to the horizontal tie member with a welding fixing pin without transferring the ground wire from the steel beam or steel column to the horizontal tie member.This improves the workability of the wrapped fire-resistant covering material. [Effects of the Invention]

[0034] As described above, according to the present invention, the workability of the fire-resistant board can be improved. [Brief explanation of the drawings]

[0035] [Figure 1] 1 is a cross-sectional view showing a steel beam to which a fire-resistant board support structure according to one embodiment is applied, and a fire-resistant board for a curtain wall. [Figure 2] FIG. 2 is an enlarged cross-sectional view of a portion of FIG. [Figure 3] FIG. 2 is an elevation view of the curtain wall unit and fire-resistant board shown in FIG. 1 as viewed from the indoor side. [Figure 4]FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. [Figure 5] FIG. 2 is an elevation view of the curtain wall unit and fire-resistant board shown in FIG. 1 as viewed from the indoor side. [Figure 6] This is a cross-sectional plan view showing adjacent mullions, fire-resistant boards, and wrapped fire-resistant covering material on the left and right. [Figure 7] 7(A) is an elevational view showing a fire-resistant board and a support member to which a modified example of a fire-resistant board support structure according to one embodiment is applied, and FIG. 7(B) is a cross-sectional view taken along line 7B-7B in FIG. 7(A). DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, an embodiment will be described with reference to the drawings.

[0037] (Fireproof board support structure) FIG. 1 shows a steel beam 10 to which a fire-resistant board support structure according to this embodiment is applied, and a fire-resistant board 70 for a curtain wall 50.

[0038] (steel beam) 1 and 2, the steel beam 10 is formed of an H-shaped steel. The steel beam 10 has an upper flange portion 12 and a lower flange portion 14 that face each other in the vertical direction, and a web portion 16 that connects the upper flange portion 12 and the lower flange portion 14.

[0039] The steel beams 10 are arranged along the edges of the slabs 40 and support the edges of the slabs 40. The slabs 40 are made of reinforced concrete and form the floors of a given floor of a multi-story structure. A curtain wall 50 and a fire-resistant board 70 are installed on the exterior side (the OUT side) of the steel beams 10 and slabs 40. The steel beams 10 and slabs 40 are an example of a skeleton.

[0040] (Curtain wall) The curtain wall 50 is arranged on the outdoor side of the slab 40 across the upper and lower floors of the structure, and constitutes the exterior wall (exterior) of the structure. The curtain wall 50 is formed into a wall shape by assembling a plurality of curtain wall units 50U arranged vertically and horizontally.

[0041] As shown in Figure 3, the curtain wall unit 50U has a pair of mullions 52, a plurality of (three in this embodiment) transoms 54 connecting the pair of mullions 52, and window glass 56 (see Figure 1) provided within a frame formed by the mullions 52 and the transoms 54. The mullions 52 and the transoms 54 are made of, for example, aluminum.

[0042] The curtain wall unit 50U has mullion side fasteners 60, fire-resistant boards 70, finishing materials 72, a pair of support members 80, horizontal ties 88, a wrap-around fire-resistant covering material 100, and a moisture-shielding sheet 104. These mullion side fasteners 60, fire-resistant boards 70, finishing materials 72, a pair of support members 80, horizontal ties 88, a wrap-around fire-resistant covering material 100, and a moisture-shielding sheet 104 are attached to the curtain wall unit 50U, for example, before the curtain wall unit 50U is erected.

[0043] In addition, in FIG. 3, the wrap-around fire-resistant covering material 100 and the moisture barrier sheet 104, which will be described later, are omitted from the illustration.

[0044] (body side fastener, mullion side fastener) As shown in Figure 2, the mullions 52 are supported by the steel beams 10 via the frame-side fasteners 20 and the frame-side fasteners 60. The frame-side fasteners 20 are formed of steel plates that are L-shaped when viewed from the side. The frame-side fasteners 20 are reinforced by ribs 21. The horizontal flanges 22 of the frame-side fasteners 20 are joined to the upper surfaces of brackets 18 provided on the steel beams 10 by bolts 26 and nuts 28.

[0045] The bracket 18 is placed in a notch 42 formed at the end of the slab 40. It is also possible to omit the bracket 18 and fix the frame-side fastener 20 to the steel beam 10.

[0046] The vertical flange portion 24 of the body-side fastener 20 is disposed opposite the interior surface 52S of the mullion 52 on the indoor side. A mullion-side fastener 60 is joined to this vertical flange portion 24 with a bolt 30 and a nut 32.

[0047] A pair of mullions-side fasteners 60 provided on the mullions 52 (see FIG. 6) of a pair of adjacent curtain wall units 50U are joined to the vertical flange portions 24 with bolts 30 and nuts 32.

[0048] The mullion-side fastener 60 is fixed to the interior surface 52S of the mullion 52 on the indoor side by a bolt 64. The vertical middle portion of the mullion-side fastener 60 protrudes convexly toward the indoor side. A storage chamber 62 is formed in the middle portion of this mullion-side fastener 60 to store the nut 32 described above so that it cannot rotate. The mullion-side fastener 60 is joined to the body-side fastener 20 by tightening the bolt 30 described above into this nut 32.

[0049] The mounting portion 86 of the support member 80 (described later) is joined (fastened together) to the vertical fastener 60 by a bolt 30 and a nut 32 .

[0050] The bolt holes (not shown) for the bolts 30 formed in the vertical flange portion 24 are elongated holes extending in the vertical direction. The upright-side fasteners 60 are provided with height-adjustment bolts 66 that abut against the upper ends of the vertical flange portions 24 of the frame-side fasteners 20 and adjust the height of the upright-side fasteners 60 relative to the frame-side fasteners 20.

[0051] (fireproof board) 1, a fire-resistant board (fire-resistant board for curtain wall) 70 is provided in the spandrel portion of the curtain wall unit 50U. This fire-resistant board 70 is formed of, for example, a fiber-mixed calcium silicate board, a gypsum board, a rock wool board, a ceramic fiber board, an alkaline earth silicate wool board, or the like.

[0052] The fire-resistant board 70 is attached to the interior side of the curtain wall unit 50U, facing the window glass 56. The outer periphery of the fire-resistant board 70 is held in place by frame-shaped rails 58 and the like that are provided along the mullions 52 and the lattice 54.

[0053] The fire-resistant boards 70 are arranged on the outdoor side of the slab 40, spanning the upper and lower floors of the structure, with a space between them and the edge of the slab 40. An interlayer sealing material 44 such as rock wool is provided in this space. This prevents hot air and flames from flowing into the floor above the slab 40 through the space between the fire-resistant boards 70 and the edge of the slab 40 in the event of a fire.

[0054] (Finishing materials) A finishing material 72 is provided on the outdoor side of the fire-resistant board 70. The finishing material 72 is formed, for example, from an aluminum composite plate, and is attached to the mullions 52 and the crossbeams 54. The finishing material 72 covers the entire outdoor outer surface 70B of the fire-resistant board 70. This makes the fire-resistant board 70 invisible from the outdoor side of the curtain wall unit 50U.

[0055] The finishing material 72 extends downward below the lower end of the fire-resistant board 70. The inner surface of the lower part of this finishing material 72 facing the room is covered with a wrap-around fire-resistant covering material 100, which will be described later, and a moisture-proof sheet 104. The finishing material 72 may be provided as needed, and may be omitted as appropriate.

[0056] (support member) 3, a pair of support members (support hardware) 80 are formed from metal plates such as steel plates, and are arranged at a distance from each other in the width direction of the fire-resistant board 70. Each support member 80 has a base portion 82, a lower end hook portion 84, and an attachment portion 86.

[0057] The base portion 82 is formed in a strip shape and is arranged along the height direction (vertical direction) of the fire-resistant board 70. The base portion 82 is also arranged along the inner surface 70A on the indoor side (the steel beam 10 side) of the fire-resistant board 70. The base portion 82 is fastened to the fire-resistant board 70 with a plurality of screws 90.

[0058] The arrangement of the screws 90 can be changed as appropriate. The base portion 82 can be fixed to the fire-resistant board 70 with at least one screw 90. The screws 90 may be provided as needed and can be omitted as appropriate. As will be described later, the support member 80 can be fire-resistant coated with a wrap-around fire-resistant coating material 100 or the like to prevent a decrease in strength during a fire, thereby increasing the support capacity of the fire-resistant board 70.

[0059] Furthermore, as shown in Figure 4, if an aluminum crosspiece 54 is installed below the lower hook portion 84, it may not be possible to provide fire-resistant coating to the lower hook portion 84. If the lower hook portion 84 is heated without a fire-resistant coating, it may become difficult to support the fire-resistant board 70 due to deformation or a decrease in strength, which may cause the fire-resistant board 70 to fall off. To address this issue, the base portion 82 and the fire-resistant board 70 are fastened together with screws 90, which allows the base portion 82 to support the weight of the fire-resistant board 70, thereby preventing the fire-resistant board 70 from falling off.

[0060] 4, a lower end hook portion 84 that holds the lower end of the fire-resistant board 70 is provided at the lower end of the base portion 82. The lower end hook portion 84 is bent into an L-shape in side view, and the lower end of the fire-resistant board 70 is inserted inside the lower end hook portion 84.

[0061] The lower hook portion 84 has an extension portion 84A that extends from the lower end of the base portion 82 toward the outside of the room along the underside of the fire-resistant board 70, and a folded portion 84B that extends upward from the tip of the extension portion 84A along the outside outer surface 70B of the fire-resistant board 70.

[0062] The vertical length of the base portion 82 is preferably, for example, at least half the height (vertical length) of the fire-resistant board 70. The vertical length of the folded portion 84B is preferably at least the thickness of the fire-resistant board 70.

[0063] The crosspiece 54 of the curtain wall unit 50U is disposed below the extension 84A of the lower end hook portion 84. The crosspiece 54 supports the lower end of the fire-resistant board 70 via the lower end hook portion 84.

[0064] 3, an attachment portion 86 is provided at the upper end of the base portion 82. The attachment portion 86 extends from the upper end of the base portion 82 along the inner surface 70A of the fire-resistant board 70 toward the mullion 52, and is inserted into the storage chamber 62 of the mullion-side fastener 60 (see FIG. 2).

[0065] 2, the mounting portion 86 is joined (co-fastened) to the upright-side fastener 60 and the frame-side fastener 20 by the bolt 30 and the nut 32. As a result, the support member 80 is supported by the steel beam 10 via the upright-side fastener 60 and the frame-side fastener 20.

[0066] The mounting portion 86 is formed with a step (not shown) that absorbs the difference in level between the inner surface 70A of the fire-resistant board 70 and the storage chamber 62. The mounting portion 86 may be joined to the body-side fastener 20 with a separate bolt and nut, rather than being fastened together with the bolt 30, nut 32, and mullion-side fastener 60 to the body-side fastener 20. Furthermore, the support member 80 may be supported by a body such as a steel beam 10 or a slab 40 via a fastener separate from the body-side fastener 20.

[0067] 3, the base portions 82 of the pair of support members 80 are connected to each other by horizontal connectors 88. The horizontal connectors 88 are formed from metal plates such as steel plates, and are arranged along the inner surface 70A of the fire-resistant board 70. By connecting the base portions 82 of the pair of support members 80 to each other by the horizontal connectors 88, the rigidity of the pair of support members 80 is increased.

[0068] The horizontal tie members 88 are electrically connected to the steel beams 10 (see FIG. 2) via the support members 80, the vertical fasteners 60, and the frame-side fasteners 20 (see FIG. 2). This allows welding fixing pins 118 (see FIG. 1), which will be described later, to be welded to the horizontal tie members 88 and the base portions 82 of the support members 80 while the steel beams 10 or the steel columns (not shown) to which the steel beams 10 are connected are grounded.

[0069] The horizontal tie members 88 may be provided as needed and may be omitted as appropriate. Furthermore, the horizontal tie members 88 and the support members 80 do not necessarily need to be electrically connected to the steel beams 10.

[0070] (Wrapping fireproof coating material) As shown in Fig. 5, the inner surface 70A of the fire-resistant board 70 is covered with a wrap-around fire-resistant covering material 100. The wrap-around fire-resistant covering material 100 is formed from rock wool, ceramic wool, alkaline earth silicate wool, or the like, formed into a sheet. This wrap-around fire-resistant covering material 100 has fire resistance and heat insulation properties. Furthermore, by using high-heat-resistant rock wool for the wrap-around fire-resistant covering material 100, the fire resistance can be further improved.

[0071] The wrap-around fire-resistant covering material 100 extends from one end to the other end in the width direction of the fire-resistant board 70, covering the entire inner surface 70A of the fire-resistant board 70. This improves the fire resistance and heat insulation performance of the fire-resistant board 70.

[0072] The wrap-around fire-resistant covering material 100 also provides fire-resistant covering to the inner surface 70A of the fire-resistant board 70 from above the base portion 82 of the support member 80 and the screws 90 (see FIG. 3). In other words, the wrap-around fire-resistant covering material 100 provides fire-resistant covering to the base portion 82 of the support member 80 and the screws 90.

[0073] In this embodiment, as shown in FIG. 4, the fire-resistant coating is omitted from the extending portion 84A and the folded portion 84B of the lower hook portion 84, but it is also possible to provide a fire-resistant coating to the extending portion 84A and the folded portion 84B of the lower hook portion 84.

[0074] 5, an end 100E in the width direction of the wrap-around fire-resistant covering material 100 extends from the fire-resistant board 70 toward the mullion 52 side and covers the inner surface 52S of the mullion 52. Note that a notch 102 is formed in the end 100E in the width direction of the wrap-around fire-resistant covering material 100 to expose the mullion-side fastener 60. The mullion-side fastener 60 is fire-resistant covered by a fire-resistant covering material (not shown).

[0075] As shown in Figure 6, the mullions 52 of adjacent curtain wall units 50U on the left and right are assembled together. At this time, the ends 100E of adjacent wrap-around fire-resistant covering materials 100 come into contact or are pressed together, forming a joint M between them. As a result, even if the mullions 52 melt and burn in the event of a fire, forming a space between adjacent fire-resistant boards 70, the space will be shielded by the ends 100E of the wrap-around fire-resistant covering materials 100.

[0076] In this embodiment, the inner surface 70A of the fire-resistant board 70 and the inner surface 52S of the mullion 52 are substantially flush with each other, but there may be a step between the inner surface 70A of the fire-resistant board 70 and the inner surface 52S of the mullion 52. Furthermore, the mullion 52 may be fire-resistant coated not only with the wrap-around fire-resistant coating material 100 but also with a fire-resistant coating material other than the wrap-around fire-resistant coating material 100, for example, a spray-on fire-resistant coating such as sprayed rock wool.

[0077] As shown in FIG. 1 , the wrap-around fire-resistant covering material 100 extends downward from the inner surface 70A of the fire-resistant board 70 and covers the interior-facing inner surface of the lower part of the finishing material 72. This improves the heat insulating performance of the finishing material 72. The wrap-around fire-resistant covering material 100 also serves to prevent the fire-resistant board 70 from falling off due to heating of the support member 80 in the event of a fire. The wrap-around fire-resistant covering material 100 may be provided as needed and may be omitted as appropriate. The wrap-around fire-resistant covering material 100 does not have to cover the entire inner surface 70A of the fire-resistant board 70, and may cover only the support member 80.

[0078] (moisture-proof sheet) 1 and 5, a moisture-proof sheet 104 is attached to the interior surface of the wrap-around fire-resistant covering material 100 on the indoor side. The moisture-proof sheet 104 is formed, for example, from an aluminum sheet or the like having moisture-proof properties. By covering the interior surface of the wrap-around fire-resistant covering material 100 with this moisture-proof sheet 104, the heat insulating performance of the wrap-around fire-resistant covering material 100 and the finishing material 72 is improved.

[0079] The wrap-around fire-resistant covering material 100 and the moisture-shielding sheet 104 are screwed to the fire-resistant board 70 with a plurality of screws 106, for example, before erecting the curtain wall unit 50U. The pitch of these screws 106 is, for example, 300 mm or less. The moisture-shielding sheet 104 is attached to the wrap-around fire-resistant covering material 100 in advance with an adhesive or the like, and then fixed to the fire-resistant board 70 together with the wrap-around fire-resistant covering material 100 with screws. The moisture-shielding effect of the cut surface of the wrap-around fire-resistant covering material 100 can be improved by attaching the moisture-shielding sheet 104 without any gaps after the wrap-around fire-resistant covering material 100 is screwed to the fire-resistant board 70.

[0080] The moisture-proof sheet 104 may be provided as needed and may be omitted as appropriate.

[0081] (Synthetic fireproof coating structure) As shown in Figures 1 and 2, a steel beam 10 is fire-resistant coated with a composite fire-resistant coating structure of a fire-resistant board 70 and a beam-side wrapped fire-resistant coating material 110. Specifically, the fire-resistant board 70 is disposed on the exterior side (arrow OUT side) of the steel beam 10, facing the exterior side of the steel beam 10. The exterior side of the steel beam 10 is fire-resistant coated with this fire-resistant board 70. The beam-side wrapped fire-resistant coating material 110 is an example of a fire-resistant coating material and a wrapped fire-resistant coating material.

[0082] The beam-side wrap-around fire-resistant covering material 110 is made of rock wool, ceramic wool, alkaline earth silicate wool, or the like formed into a sheet. It is preferable to use high-heat-resistant rock wool to ensure even higher fire resistance. The beam-side wrap-around fire-resistant covering material 110 provides fire protection to the side of the steel beam 10 opposite the fire-resistant board 70 (the side indicated by the arrow IN) and the underside of the steel beam 10, and also extends under the steel beam 10 toward the fire-resistant board 70.

[0083] Specifically, the beam-side wrapped fire-resistant covering material 110 is bent overall into an L-shape when viewed from the axial direction of the steel beam 10. This beam-side wrapped fire-resistant covering material 110 has a side covering portion 112 that provides fire-resistant covering to the side surface of the steel beam 10 facing the interior of the building, and a bottom covering portion 114 that provides fire-resistant covering to the bottom surface of the steel beam 10.

[0084] 1, the side covering portion 112 is arranged along the beam direction of the steel beam 10 so as to cover the indoor-side side surface of the steel beam 10. The side covering portion 112 is arranged across the upper flange portion 12 and the lower flange portion 14 of the steel beam 10, and its upper end is attached to the end of the upper flange portion 12 by a welded fixing pin 116.

[0085] The lower surface covering portion 114 is arranged along the beam width direction of the steel beam 10 so as to cover the lower surface of the lower flange portion 14 of the steel beam 10. The lower surface covering portion 114 also extends from the lower end of the side surface covering portion 112 along the lower surface of the lower flange portion 14 toward the fireproof board 70. The lower surface covering portion 114 is attached to the lower surface of the lower flange portion 14 by a welded fixing pin 116.

[0086] The tip end 114T of the underside covering portion 114 is placed on the inner surface 70A of the fireproof board 70, over the moisture barrier sheet 104, the wrapped fireproof covering material 100, and the horizontal tie member 88 (see FIG. 3). The tip end 114T of the underside covering portion 114 is attached to the horizontal tie member 88 and the support member 80 with a plurality of welded fixing pins 118. The space between the fireproof board 70 and the steel beam 10 is blocked by this underside covering portion 114.

[0087] The multiple welding fixation pins 118 are arranged at intervals in the width direction of the fireproof board 70. Each welding fixation pin 118 penetrates the tip side 114T of the lower surface covering portion 114 from below, and its tip abuts against the base portion 82 of the support member 80 or the horizontal connecting member 88.

[0088] In this state, an earth is attached to the steel beam 10 or the steel column joined to the steel beam 10, and an electric current is passed through the welding fixing pin 118 from a welding machine (welding gun) not shown, thereby welding the tip of the welding fixing pin 118 to the base part 82 or the horizontal connecting member 88. In this way, the welding fixing pin 118 attaches the tip side 114T of the lower surface covering part 114 to the inner surface 70A of the fire-resistant board 70, and in the event of a fire, hot air and flames are prevented from flowing into the steel beam 10 through the gap between the inner surface 70A of the fire-resistant board 70 and the tip side 114T of the lower surface covering part 114.

[0089] The tip end 114T of the wrapping fire-resistant covering material 100 (lower surface covering portion 114) may be fixed to the fire-resistant board not only by the welding fixing pin 118 but also by a screw or the like, for example.

[0090] (action) Next, the operation of this embodiment will be described.

[0091] (Fireproof board support structure) As shown in Figures 1 and 2, according to this embodiment, a curtain wall unit 50U and a fire-resistant board 70 attached to the spandrel portion of the curtain wall unit 50U are arranged on the outdoor side of the steel beam 10.

[0092] The fire-resistant board 70 is supported on the steel beam 10 via the curtain wall unit 50U, the upright side fasteners 60, and the main body side fasteners 20, and is also supported on the steel beam 10 via a pair of support members 80, the upright side fasteners 60, and the main body side fasteners 20.

[0093] 4, the support member 80 has a lower end hook portion 84 and a base portion 82. The lower end of the fire-resistant board 70 is inserted inside the lower end hook portion 84. The lower end of the fire-resistant board 70 is supported from below by the lower end hook portion 84, and the lower end of the fire-resistant board 70 is held from both sides in the out-of-plane direction by the lower end hook portion 84 and the base portion 82.

[0094] As a result, even if the mullions 52 and the like of the curtain wall unit 50U melt and burn during a fire, the fire-resistant board 70 is supported by the steel beams 10 via the pair of support members 80, the mullion-side fasteners 60, and the frame-side fasteners 20. This prevents the fire-resistant board 70 from falling off during a fire.

[0095] 6, the inner surfaces 52S of the mullions 52 of the curtain wall unit 50U are covered by the ends 100E in the width direction of the wrap-around fire-resistant covering material 100. Therefore, even if the mullions 52 and the like of the curtain wall unit 50U melt and burn during a fire, forming a space between adjacent fire-resistant boards 70, the space is shielded by the ends 100E of the wrap-around fire-resistant covering material 100. Therefore, the fire heat that penetrates into the room from the space formed between adjacent fire-resistant boards 70 is prevented, improving the fire resistance of the steel beam 10.

[0096] 4, the base portion 82 of the support member 80 extends upward from the lower end hook portion 84 along the inner surface of the fire-resistant board 70 facing the steel beam 10. This base portion 82 further prevents the fire-resistant board 70 from tilting toward the steel beam 10. This prevents the fire-resistant board 70 from falling off in the event of a fire.

[0097] Furthermore, the base portion 82 is fastened to the fire-resistant board 70 with a plurality of screws 90. If the fire-resistant board 70 were not fastened to the base portion 82 with screws, and the lower end hook portion 84 were to deteriorate due to heat in the event of a fire, the load of the fire-resistant board 70 would cause the lower end hook portion 84 to deform downward, and the fire-resistant board 70 could fall off.

[0098] In contrast, in this embodiment, as described above, the base portion 82 is fastened to the fire-resistant board 70 with screws, and the fire-resistant board 70 is supported by the base portion 82 via a plurality of screws 90. This reduces the load acting from the fire-resistant board 70 on the lower-end hook portion 84. Therefore, even if the lower-end hook portion 84 is thermally deteriorated in the event of a fire, downward deformation of the lower-end hook portion 84 is suppressed.

[0099] Furthermore, as described above, the lower end hook portion 84 and the base portion 82 restrict out-of-plane movement of the lower end of the fire-resistant board 70, thereby mitigating stress generated at the joint between the fire-resistant board 70 and the screw 90. This prevents the screw 90 from coming off the fire-resistant board 70.

[0100] Furthermore, the screws 90 have a higher holding power than adhesives and are less likely to lose their holding power even when heated, which further reduces the risk of the fire-resistant board 70 falling off in the event of a fire.

[0101] Furthermore, since the support member 80 is attached to the lower side of the fire-resistant board 70, but not to the upper side of the fire-resistant board 70, it can be easily attached to the fire-resistant board 70. Therefore, the workability of the fire-resistant board 70 is improved.

[0102] Furthermore, in this embodiment, the base portion 82 of the support member 80 is screwed to the fire-resistant board 70 before the curtain wall unit 50U is erected. Therefore, in this embodiment, the base portion 82 can be screwed to the fire-resistant board 70 in a state that is easier to install than when the base portion 82 is screwed to the fire-resistant board 70 after the curtain wall unit 50U has been erected. Therefore, damage to the fire-resistant board 70 is suppressed.

[0103] Furthermore, if the fire-resistant board 70 is damaged after erecting the curtain wall unit 50U, it takes time and effort to replace the fire-resistant board 70. In contrast, in the present embodiment, by fastening the base portion 82 to the fire-resistant board 70 with screws before erecting the curtain wall unit 50U, even if the fire-resistant board 70 is damaged, the fire-resistant board 70 can be easily replaced. Therefore, the workability of the fire-resistant board 70 is improved.

[0104] Furthermore, before erecting the curtain wall unit 50U, the mounting portion 86 of the support member 80 is inserted into the storage chamber 62 of the upright-side fastener 60. In this state, the curtain wall unit 50U is erected. Then, when joining the upright-side fastener 60 to the frame-side fastener 20, the mounting portion 86 of the support member 80 and the upright-side fastener 60 are fastened together to the frame-side fastener 20 with the bolt 30 and nut 32.

[0105] As a result, the curtain wall unit 50U and the support members 80 are supported on the steel beams 10 via the mullions-side fasteners 60 and the frame-side fasteners 20. Therefore, in this embodiment, the workability of the fire-resistant board 70 is improved compared to when the mullions 52 and the support members 80 are supported on the steel beams 10 via separate fasteners.

[0106] Additionally, the inner surface 70A of the fire-resistant board 70, the base 82, and the screws 90 are covered with a wrap-around fire-resistant covering material 100 and a moisture-proof sheet 104. This reduces the temperature rise of the base 82, the screws 90, and the fire-resistant board 70 during a fire, thereby preventing a decrease in the bonding strength between the screws 90 and the fire-resistant board 70. This further prevents the fire-resistant board 70 from falling off during a fire.

[0107] Furthermore, before erecting the curtain wall unit 50U, the wrap-around fire-resistant covering material 100 and the moisture barrier sheet 104 are fastened with screws to the inner surface 70A of the fire-resistant board 70. This improves workability in this embodiment compared to when the wrap-around fire-resistant covering material 100 is fastened with screws to the inner surface 70A of the fire-resistant board 70 or when sprayed rock wool is sprayed onto the inner surface 70A of the fire-resistant board 70 after erecting the curtain wall unit 50U.

[0108] Furthermore, if the gap (construction space) between the fire-resistant board 70 and the steel beam 10 is narrow, after erecting the curtain wall unit 50U, it may be difficult to apply the wrap-around fire-resistant covering material 100 or sprayed rock wool to the inner surface 70A of the fire-resistant board 70. In such cases, this embodiment is particularly effective.

[0109] Furthermore, as described above, if the fire-resistant board 70 is damaged after erecting the curtain wall unit 50U, it takes time and effort to replace the fire-resistant board 70. In contrast, in the present embodiment, as described above, by wrapping the fire-resistant covering material 100 around the fire-resistant board 70 and fastening the moisture-proof sheet 104 with screws before erecting the curtain wall unit 50U, even if the fire-resistant board 70 is damaged, the fire-resistant board 70 can be easily replaced. Therefore, the workability of the fire-resistant board 70 is improved.

[0110] Furthermore, a finishing material 72 is provided on the outdoor side of the fire-resistant board 70. The finishing material 72 covers almost the entire outer surface 70B of the fire-resistant board 70. This improves the design of the curtain wall unit 50U.

[0111] Furthermore, the finishing material 72 extends downward from the fire-resistant board 70. The wrap-around fire-resistant covering material 100 also extends downward from the inner surface 70A of the fire-resistant board 70, covering the inner surface 70A on the indoor side of the finishing material 72. In other words, the finishing material 72 also functions as a base material for the wrap-around fire-resistant covering material.

[0112] As a result, for example, the height of the fire-resistant board 70 can be kept to the height required to prevent the fire from spreading to upper floors (for example, 900 mm), while the wrap-around fire-resistant covering material 100 extending downward from the inner surface 70A of the fire-resistant board 70 can ensure the heat insulating performance below the fire-resistant board 70. Therefore, the material cost of the fire-resistant board 70 can be reduced.

[0113] (Synthetic fireproof coating structure) 1, the fire-resistant board 70 of this embodiment, together with the beam-side wrapped fire-resistant covering material 100, constitutes a composite fire-resistant covering structure for the steel beam 10. Specifically, the beam-side wrapped fire-resistant covering material 110 passes under the steel beam 10 from the side opposite the fire-resistant board 70 on the steel beam 10 and protrudes toward the fire-resistant board 70 side.

[0114] The tip end 114T of the beam-side wrapped fire-resistant covering material 110 is overlapped on the horizontal tie material 88 from above the wrapped fire-resistant covering material 100 and the moisture barrier sheet 104. A welding fixing pin 118 passes through the tip end 114T of the beam-side wrapped fire-resistant covering material 110. The tip end of this welding fixing pin 118 is welded to the horizontal tie material 88, thereby fixing the tip end 114T of the beam-side wrapped fire-resistant covering material 110 to the horizontal tie material 88.

[0115] As a result, the beam-side wrapped fire-resistant covering material 110 fills the space between the steel beam 10 and the fire-resistant board 70, and the steel beam 10 is fire-resistant covered (composite fire-resistant covering) by the beam-side wrapped fire-resistant covering material 110 and the fire-resistant board 70. Therefore, the fire resistance performance of the steel beam 10 is improved.

[0116] In addition, in this embodiment, the tip end 114T of the beam-side wrapped fire-resistant covering material 110 is fixed to the horizontal connecting member 88 or the base portion 82 by a welding fixing pin 118. As a result, in this embodiment, damage to the fire-resistant board 70 is suppressed and workability is improved, compared to, for example, a case in which the tip end 114T of the beam-side wrapped fire-resistant covering material 110 is fixed to the fire-resistant board 70 by a screw.

[0117] Furthermore, the connecting member 88 is electrically connected to the steel beam 10 via the support member 80, the vertical fastener 60, and the frame fastener 20. This allows the steel beam 10 or a steel column (not shown) connected to the steel beam 10 to be grounded when the weld fixing pin 118 is welded to the horizontal connecting member 88 or the base portion 82.

[0118] Therefore, for example, first, while attaching an earth to the steel beam 10 or the like, the beam-side wrapped fire-resistant covering material 110 can be fixed to the steel beam 10 with the welded fixing pin 116, and then the tip side of the beam-side wrapped fire-resistant covering material 110 can be fixed to the horizontal connecting member 88 with the welded fixing pin 118 without reconnecting the earth from the steel beam 10 or the steel column to the horizontal connecting member 88. Therefore, the workability of the beam-side wrapped fire-resistant covering material 110 is improved.

[0119] Incidentally, when the fire-resistant board 70 is heated from outside the room during a fire, the temperature of the inner surface 70A of the fire-resistant board 70 rises, and the space between the fire-resistant board 70 and the steel beam 10 is heated. In this case, the fire resistance performance (for example, 1 to 3 hours fire resistance) of the steel beam 10 may be reduced.

[0120] In contrast to this, in this embodiment, as described above, the inner surface 70A of the fire-resistant board 70 is covered with the wrap-around fire-resistant covering material 100 and the moisture-proof sheet 104. This reduces the temperature rise in the space between the fire-resistant board 70 and the steel beam 10 even if the fire-resistant board 70 is heated from outside the room during a fire. This ensures the fire resistance performance of the steel beam 10 (for example, 1 to 3 hours of fire resistance).

[0121] (Variation) Next, a modification of the above embodiment will be described.

[0122] In the modified example shown in Figures 7(A) and 7(B), side edge hook portions 92 that hold the side edges in the width direction of the fire-resistant board 70 are provided on the base portion 82 of the support member 80. The side edge hook portions 92 are arranged along the side edges of the fire-resistant board 70. The side edge hook portions 92 are formed in an L-shape in cross section. The side edges of the fire-resistant board 70 are inserted inside the side edge hook portions 92.

[0123] As a result, the side end hook portions 92 and the base portion 82 hold the side end portions of the fire-resistant board 70 from both sides in the out-of-plane direction. This prevents the fire-resistant board 70 from tilting toward the inside or outside of the room. This also prevents the fire-resistant board 70 from falling off in the event of a fire. In this modified example, the base portion 82 is not fastened with screws.

[0124] Furthermore, by providing steel side end hook portions 92 at the side ends in the width direction of the fire-resistant board 70, it becomes possible to fasten the welding fixing pins 118 to the side end hook portions 92.

[0125] As described above, if the wrap-around fire-resistant covering material 100 is fastened to the fire-resistant board 70 with screws after the curtain wall unit 50U has been erected, there is a risk of damaging the fire-resistant board 70. If the fire-resistant board 70 is damaged after the curtain wall unit 50U has been erected, it will be extremely difficult to replace or repair the fire-resistant board 70. In contrast, if steel side-end hook portions 92 are provided on the side ends in the width direction of the fire-resistant board 70, as in this modified example, the wrap-around fire-resistant covering material 100 can be fastened to the side-end hook portions 92 with welded fixing pins 118, eliminating the risk of damaging the fire-resistant board 70.

[0126] In Figure 6, the inner surfaces 52S of the mullions 52 of the curtain wall unit 50U are covered by the widthwise ends 100E of the wrap-around fire-resistant covering material 100 fastened with screws to the inner surface 70A of the fire-resistant board 70. However, depending on the shape and fit of the mullions 52, it may be difficult to cover the inner surfaces 52S of the mullions 52 using this method. In this case, for example, the inner surfaces 52S of the mullions 52 are fire-resistant covered after the curtain wall unit 50U is erected.

[0127] In the above embodiment, the curtain wall unit 50U is supported on the steel beam 10 via the vertical-side fasteners 60 and the structural body-side fasteners 20. However, the curtain wall unit 50U may also be supported on, for example, the slab 40 via the vertical-side fasteners 60 and the structural body-side fasteners 20.

[0128] In the above embodiment, the composite fire-resistant coating structure of the steel beam 10 is composed of the fire-resistant board 70 and the beam-side wrapped fire-resistant coating material 110. However, the fire-resistant coating material on the steel beam 10 side is not limited to the beam-side wrapped fire-resistant coating material 110, and may be, for example, a sprayed fire-resistant coating material such as sprayed rock wool, or a board-type fire-resistant coating material such as a fiber-mixed calcium silicate board.

[0129] 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 modified examples may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various forms as long as they do not deviate from the gist of the present invention. [Explanation of symbols]

[0130] 10 Steel beam (body) 20 Body side fastener 40 Slab (body) 52 Mullion 52S Inner surface (inner surface of the mullion facing the room) 60 Mullion side fastener 70 Fireproof board 70A Inner surface (inner surface of the fireproof board facing the interior) 80 Support member 82 Base 84 Lower hook 86 Mounting part 88 Horizontal joint 90 screws 92 Side end hook part 110 Beam-side wrapped fire-resistant coating material (fire-resistant coating material, wrapped fire-resistant coating material) 114T Tip side (tip side of fireproof coating material wrapped around beam side) 118 Welding fixing pin

Claims

1. The body and a fireproof board disposed on the exterior side of the frame; a support member that is supported by the frame, the support member having a lower end hook portion that holds a lower end of the fireproof board, and a base portion that extends upward from the lower end hook portion along the inner surface of the fireproof board facing the frame and is fastened to the fireproof board with a screw; A fire-resistant board support structure comprising:

2. A structure, a fireproof board disposed on the exterior side of the frame; a support member supported by the building frame, the support member having: a lower end hook portion for holding a lower end of the fire-resistant board; a base portion extending upward from the lower end hook portion along the inner surface of the fire-resistant board facing the building frame; and side end hook portions provided on the base portion and formed in an L-shape in a plan cross section, the side end hook portions holding side ends of the fire-resistant board inserted inside; A fire-resistant board support structure comprising:

3. A support member arranged along the side edge of the fire-resistant board; a mullion side fastener provided on the mullion; a body-side fastener provided on the body and to which the vertical-side fastener is bolted; Equipped with The support member has an attachment portion extending from the base portion toward the upright side and bolted to the body-side fastener.

3. A fire-resistant board support structure according to claim 1 or claim 2.

4. A structure, a fireproof board disposed on the exterior side of the frame; a support member that is supported by the building frame and includes a lower end hook portion that holds a lower end of the fire-resistant board and a base portion that extends upward from the lower end hook portion along the inner surface of the fire-resistant board facing the building frame; a mullion disposed along a side edge of the fireproof board; a mullion side fastener provided on the mullion; a body-side fastener provided on the body and to which the vertical-side fastener is bolted; Equipped with The support member has an attachment portion extending from the base portion toward the upright side and bolted to the body-side fastener. Fire-resistant board support structure.

5. A structure, a fireproof board disposed on the exterior side of the frame; a support member that is supported by the building frame and includes a lower end hook portion that holds a lower end of the fire-resistant board and a base portion that extends upward from the lower end hook portion along the inner surface of the fire-resistant board facing the building frame; A pair of the support members arranged at an interval in the width direction of the fire-resistant board; A horizontal connector arranged along the inner surface of the fireproof board and connecting the base portions of the pair of support members to each other; A fire-resistant board support structure comprising:

6. The fireproof board support structure according to any one of claims 1 to 5, wherein the fireproof board is disposed on the side of a steel beam constituting the skeleton; a fireproof coating material that fireproofs the side and underside of the steel beam opposite the fireproof board and seals the gap between the steel beam and the fireproof board; A synthetic fire-resistant coated structure.

7. The fire-resistant board support structure according to claim 5, wherein the fire-resistant board is disposed on the side of a steel beam constituting the skeleton; a wound fireproof covering material that extends from the opposite side of the fireproof board in the steel beam, passing under the steel beam, toward the fireproof board, and whose protruding tip side is overlapped on the metal horizontal connecting material; a weld fixing pin that penetrates the tip side of the wrapped fire-resistant covering material and has a tip portion welded to the horizontal connecting material; A synthetic fire-resistant coated structure.

8. The horizontal connecting member is electrically connected to the steel beam via the support member.

8. The composite fire-resistant coated structure of claim 7.

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