JP7760366B2 - Fireproof board insulation structure for curtain wall and synthetic fireproof coating structure - Google Patents

Description

The present invention relates to a fire-resistant board insulation structure for curtain walls and a synthetic fire-resistant coated structure.

Fire-resistant structures that use fire-resistant boards on curtain walls are known (see, for example, Patent Documents 1 to 4).

JP 2014-173379 A JP 2011-202353 A JP 2010-001646 A Japanese Patent Application Laid-Open No. 2006-291621

However, there are cases where the fire-resistant boards attached to curtain walls are required to have insulating properties. In such cases, after the curtain wall and fire-resistant boards have been erected, it is possible to spray rock wool onto the interior surface of the fire-resistant boards on-site.

However, applying sprayed rock wool is time-consuming. Furthermore, applying sprayed rock wool can be difficult when, for example, there is little installation space between the fireproof board and the beams installed on the interior side of the fireproof board.

In consideration of the above, the present invention aims to improve the thermal insulation performance of fire-resistant boards installed on curtain walls while improving workability.

The fire-resistant board insulation structure for curtain walls described in claim 1 comprises a curtain wall placed on the exterior side of a building frame, a fire-resistant board attached to the curtain wall, and a wrap-around fire-resistant covering material attached to the interior surface of the fire-resistant board on the interior side, covering the interior surface from one end to the other in the width direction of the fire-resistant board.

According to the fire-resistant board insulation structure for curtain walls of claim 1, the curtain wall is placed on the exterior side of the building frame. A fire-resistant board is provided on this curtain wall. A wrap-around fire-resistant covering material is attached to the interior surface of the fire-resistant board on the interior side.

The wrap-around fire-resistant covering material not only provides fire resistance but also heat insulation. By covering the interior surface of the fire-resistant board facing the room with this wrap-around fire-resistant covering material from one end to the other in the width direction of the fire-resistant board, the heat insulation performance of the fire-resistant board is improved.

In addition, the wrap-around fire-resistant covering material can be attached to the interior surface of the fire-resistant board before the curtain wall and fire-resistant board are erected. Therefore, it can be attached to the interior surface of the fire-resistant board regardless of whether there is a construction space between the fire-resistant board and the beams installed on the interior side of the fire-resistant board.

In this way, the present invention can improve the insulating performance of fire-resistant boards installed on curtain walls while improving workability.

The fire-resistant board insulation structure for curtain walls described in claim 2 is the fire-resistant board insulation structure for curtain walls described in claim 1, in which the wrapped fire-resistant covering material is fastened to the fire-resistant board with screws.

According to the fire-resistant board insulation structure for curtain walls of claim 2, the wrapped fire-resistant covering material is fastened to the fire-resistant board with screws. This improves workability.

In addition, screws have a stronger holding power than adhesives and are less likely to lose their holding power even when heated. Therefore, by fastening the wrap-around fire-resistant covering to the fire-resistant board with screws, the wrap-around fire-resistant covering is less likely to fall off in the event of a fire.

The fire-resistant board insulation structure for curtain walls described in claim 3 is the fire-resistant board insulation structure for curtain walls described in claim 1 or claim 2, and further includes a moisture-proof sheet attached to the interior surface of the wrapped fire-resistant covering material and covering the interior surface.

According to the fireproof board insulation structure for curtain walls of claim 3, a moisture-proof sheet is attached to the interior surface of the wrapped fireproof covering material on the indoor side. By covering the interior surface of the fireproof board with this moisture-proof sheet, the insulation performance of the fireproof board is further improved.

In addition, the moisture barrier sheet can be attached to the wrap-around fire-resistant covering material in advance with adhesive or other adhesive, and then attached to the fire-resistant board together with the wrap-around fire-resistant covering material using screws or other fasteners. This improves workability.

The fire-resistant board insulation structure for curtain walls described in claim 4 is the fire-resistant board insulation structure for curtain walls described in any one of claims 1 to 3. In this structure, the structure includes 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 frame, and is provided with a support member that is supported by the frame, and the wrapped fire-resistant covering material covers the inner surface of the fire-resistant board from above the base portion.

According to the fire-resistant board insulation structure for curtain walls of claim 4, the support member has 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 frame, and is supported by the frame. By supporting the fire-resistant board with this support member, even if the curtain wall melts and burns down in the event of a fire, the fire-resistant board is prevented from falling off, etc.

In addition, the wrapped fire-resistant covering material covers the inner surface of the fire-resistant board from above the base portion. This prevents the temperature of the base portion from rising during a fire, further preventing the fire-resistant board from falling off during a fire.

The fire-resistant board insulation structure for curtain walls described in claim 5 is the fire-resistant board insulation structure for curtain walls described in any one of claims 1 to 4, wherein the curtain wall has a mullion arranged along the side edge of the fire-resistant board in the width direction, and the end of the wrapped fire-resistant covering material on the mullion side extends toward the mullion and covers the interior surface of the mullion on the room side.

According to the fire-resistant board insulation structure for curtain walls of claim 5, the curtain wall has a mullion. The mullion is arranged along the side edge of the fire-resistant board in the width direction. Furthermore, the end of the wrapped fire-resistant covering material on the mullion side extends toward the mullion and covers the interior surface of the mullion on the room side.

Here, for example, if the mullions melt and burn during a fire, creating a space, there is a possibility that the heat of the fire will penetrate from the outside to the inside of the fireproof board through that space.

In contrast, with the present invention, as described above, the interior surface of the mullion facing the room is covered by the end of the wrap-around fire-resistant covering material on the mullion side. As a result, even if the mullion melts and burns down during a fire, creating a space, that space is shielded (heat-insulated) by the end of the wrap-around fire-resistant covering material on the mullion side. This improves fire resistance.

The fire-resistant board insulation structure for curtain walls described in claim 6 is a fire-resistant board insulation structure for curtain walls described in any one of claims 1 to 4, wherein the curtain wall has mullions arranged along the side edges of the fire-resistant boards in the width direction, and a mullion-wrapped fire-resistant covering material is provided on the edges of the mullions on the side of the mullions, overlapping the edges and fastened with screws, and extending toward the mullions to cover the interior surfaces of the mullions on the room side.

According to the fire-resistant board insulation structure for curtain walls of claim 6, the curtain wall has mullions. The mullions are arranged along the side edges of the fire-resistant board in the width direction. Furthermore, a wrap-around fire-resistant covering material for the mullions is provided on the ends of the wrap-around fire-resistant covering material on the mullion side. The wrap-around fire-resistant covering material for the mullions is screwed onto the ends of the wrap-around fire-resistant covering material on the mullion side, and extends toward the mullions, covering the interior surfaces of the mullions facing the room.

Here, for example, if the mullions melt and burn during a fire, creating a space, there is a possibility that the heat of the fire will penetrate from the outside to the inside of the fireproof board through that space.

In contrast, with the present invention, as described above, the interior surface of the mullions facing the room is covered with the wrap-around fire-resistant covering material for the mullions. As a result, even if the mullions melt and burn during a fire, creating a space, the space is shielded (heat-insulated) by the wrap-around fire-resistant covering material for the mullions. This improves fire resistance.

Furthermore, by providing a wrap-around fire-resistant covering material for mullions on the end of the wrap-around fire-resistant covering material on the mullions' side, the inside surface of the mullions can be covered with the wrap-around fire-resistant covering material for mullions, even if, for example, the inside surface of the mullions is located closer to the room than the outer surface of the fire-resistant board, but farther from the inner surface of the fire-resistant board.

The fire-resistant board insulation structure for curtain walls described in claim 7 is the fire-resistant board insulation structure for curtain walls described in claim 6, in which the curtain wall and the wrapped fire-resistant coating material are respectively arranged on both sides of the upright, and the ends of the wrapped fire-resistant coating material on both sides, or the ends of the wrapped fire-resistant coating material for the upright on both sides, are combined with each other on the indoor side of the upright.

According to the fire-resistant board insulation structure for curtain walls of claim 7, the curtain wall and the wrap-around fire-resistant covering material are arranged on both sides of the mullions. Furthermore, the ends of the wrap-around fire-resistant covering material on both sides, or the ends of the wrap-around fire-resistant covering material for the mullions on both sides, are joined together on the interior side of the mullions.

As a result, if the mullions melt and burn during a fire, creating a void, the heat from the fire will be prevented from penetrating into the room through the joints at the ends of the wrap-around fire-resistant covering material on both sides, or through the joints at the ends of the wrap-around fire-resistant covering material for the mullions on both sides. This further improves fire resistance.

The fire-resistant board insulation structure for curtain walls described in claim 8 is the fire-resistant board insulation structure for curtain walls described in any one of claims 1 to 7, and further includes a finishing material that covers the exterior surface of the fire-resistant board on the outdoor side and extends downward from the fire-resistant board, and the wrapped fire-resistant covering material extends downward from the interior surface of the fire-resistant board and covers the interior surface of the finishing material on the indoor side.

According to the fire-resistant board insulation structure for curtain walls of claim 8, the finishing material covers the exterior surface of the fire-resistant board on the outdoor side. This improves the design of the curtain wall.

The finishing material extends downward from the fire-resistant board. Meanwhile, the wrap-around fire-resistant covering material extends downward from the interior surface of the fire-resistant board on the indoor side, covering the interior surface of the finishing material. In other words, the finishing material also functions as a base material for the wrap-around fire-resistant covering material.

This allows, for example, the height of the fire-resistant board to be kept to the height necessary to prevent the fire from spreading to upper floors, while ensuring thermal insulation performance below the fire-resistant board by using the wrapped fire-resistant covering material that extends downward from the inner surface of the fire-resistant board. This therefore reduces the material cost of the fire-resistant board.

The composite fire-resistant covering structure described in claim 9 comprises the fire-resistant board insulation structure for curtain walls described in any one of claims 1 to 8, and a beam-side wrapped fire-resistant covering material that extends from the opposite side of the fire-resistant board on the steel beams that make up the framework, passing under the steel beams and overhanging the fire-resistant board side, with the tip of the overhanging material being pressure-bonded to the wrapped fire-resistant covering material.

According to the composite fire-resistant coating structure of claim 9, the beam-side wrapped fire-resistant coating passes under the steel beam from the side opposite the fire-resistant board and extends toward the fire-resistant board, with the tip of the extended portion being crimped and joined to the wrapped fire-resistant coating.

As a result, in this invention, workability is improved and damage to the fireproof board is suppressed compared to, for example, when the tip of the fireproof covering material wrapped around the beam side is fixed to the fireproof board with screws.

As explained above, the present invention can improve the insulation performance of fire-resistant boards installed on curtain walls while improving workability.

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. FIG. FIG. 2 is an enlarged cross-sectional view of a portion of FIG. 1. FIG. 2 is an elevation view of the curtain wall unit and fireproof board shown in FIG. 1 as seen from the indoor side. 4 is a cross-sectional view taken along line 4-4 of FIG. 3. FIG. 2 is an elevation view of the curtain wall unit and fireproof board shown in FIG. 1 as seen from the indoor side. This is a cross-sectional plan view showing adjacent mullions, fire-resistant boards, and wrapped fire-resistant covering material on the left and right. 7A 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. 7B is a cross-sectional view taken along line 7B-7B in FIG. 7A. FIG. 10 is a cross-sectional plan view showing adjacent mullions, fireproof boards, and wrapped fireproof covering material to which a modified example of a fireproof board support structure according to one embodiment of the present invention is applied. FIG. 10 is a cross-sectional plan view showing adjacent mullions, fireproof boards, and wrapped fireproof covering material to which a modified example of a fireproof board support structure according to one embodiment of the present invention is applied. FIG. 10 is a cross-sectional plan view showing adjacent mullions, fireproof boards, and wrapped fireproof covering material to which a modified example of a fireproof board support structure according to one embodiment of the present invention is applied.

One embodiment will be described below with reference to the drawings.

(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.

(steel beam)
1 and 2, the steel beam 10 is formed of an H-shaped steel beam. 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.

The steel beams 10 are positioned along the edges of the slabs 40, supporting 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 fire-resistant board 70 are installed on the exterior side (the OUT side) of these steel beams 10 and slabs 40. The steel beams 10 and slabs 40 are an example of a building frame.

(Curtain wall)
The curtain wall 50 is disposed on the exterior 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.

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

The curtain wall unit 50U includes vertical fasteners 60, fire-resistant boards 70, finishing materials 72, a pair of support members 80, horizontal ties 88, wrap-around fire-resistant covering material 100, and a moisture-blocking sheet 104. These vertical fasteners 60, fire-resistant boards 70, finishing materials 72, a pair of support members 80, horizontal ties 88, wrap-around fire-resistant covering material 100, and moisture-blocking sheet 104 are attached to the curtain wall unit 50U, for example, before erecting the curtain wall unit 50U.

Note that Figure 3 omits the wrap-around fire-resistant covering material 100 and moisture-proof sheet 104, which will be described later.

(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. A horizontal flange portion 22 of the frame-side fasteners 20 is joined to the upper surface of a bracket 18 provided on the steel beams 10 by bolts 26 and nuts 28.

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.

The vertical flange portion 24 of the frame-side fastener 20 is positioned opposite the interior surface 52S of the mullion 52 on the room side. The mullion-side fastener 60 is joined to this vertical flange portion 24 with a bolt 30 and a nut 32.

A pair of upright side fasteners 60 provided on the uprights 52 (see Figure 6) of a pair of adjacent curtain wall units 50U are joined to the vertical flange portion 24 using bolts 30 and nuts 32.

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

The mounting portion 86 of the support member 80 (described later) is joined (fastened together) to the upright fastener 60 using a bolt 30 and a nut 32.

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 fasteners 60 are also 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 fasteners 60 relative to the frame-side fasteners 20.

(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 from, 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.

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 this fire-resistant board 70 is held in place by frame-shaped rails 58 and other components that run along the mullions 52 and the transom 54.

The fire-resistant boards 70 are placed 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 in the event of a fire through the space between the fire-resistant boards 70 and the edge of the slab 40.

(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.

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

(Support member)
3, a pair of support members (support hardware) 80 are formed from metal plates such as steel plates, and are spaced apart 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.

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.

The placement of the screws 90 can be changed as needed. The base portion 82 can be fixed to the fire-resistant board 70 with at least one screw 90. Screws 90 can be provided as needed and can be omitted as needed. As described below, 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.

Furthermore, for example, 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 a fire-resistant coating for 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 could result in the fire-resistant board 70 falling off. As a countermeasure, by fastening the base portion 82 and the fire-resistant board 70 with screws 90, the weight of the fire-resistant board 70 can be supported by the base portion 82, preventing the fire-resistant board 70 from falling off.

As shown in Figure 4, a lower 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 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 it.

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 exterior surface 70B of the fire-resistant board 70 on the outside of the room.

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

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

As shown in Figure 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 Figure 2).

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

The mounting portion 86 has a step (not shown) that compensates for 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 frame-side fastener 20 with a separate bolt and nut, rather than being fastened together with the bolt 30, nut 32, and vertical fastener 60. Furthermore, the support member 80 may be supported by a frame, such as a steel beam 10 or slab 40, via a separate fastener from the frame-side fastener 20.

As shown in FIG. 3, the base portions 82 of a pair of support members 80 are connected to each other by horizontal ties 88. The horizontal ties 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 these horizontal ties 88, the rigidity of the pair of support members 80 is increased.

The horizontal connecting members 88 can be provided as needed and can be omitted as appropriate.

(Wrapping fire-resistant covering 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, the use of high-heat-resistant rock wool in the wrap-around fire-resistant covering material 100 can further improve fire resistance.

The wrap-around fire-resistant covering material 100 extends from one end to the other end of the fire-resistant board 70 in the width direction, 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.

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 Figure 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.

In this embodiment, as shown in Figure 4, the fire-resistant coating is omitted from the extension portion 84A and folded portion 84B of the lower end hook portion 84, but it is also possible to provide fire-resistant coating to the extension portion 84A and folded portion 84B of the lower end hook portion 84.

As shown in FIG. 5, the widthwise end 100E of the wrapped fire-resistant covering material 100 extends from the fire-resistant board 70 toward the mullion 52, covering the inner surface 52S of the mullion 52. The widthwise end 100E of the wrapped fire-resistant covering material 100 has a notch 102 formed therein that exposes the mullion-side fastener 60. This mullion-side fastener 60 is fire-resistant covered by a fire-resistant covering material (not shown).

As shown in Figure 6, the mullions 52 of adjacent curtain wall units 50U are assembled to each other. 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 during a fire, creating 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.

In this embodiment, the inner surface 70A of the fire-resistant board 70 and the inner surface 52S of the mullion 52 are approximately flush, 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 different fire-resistant coating material from the wrap-around fire-resistant coating material 100, such as a spray-on fire-resistant coating such as spray-on rock wool.

As shown in Figure 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 surface of the lower part of the finishing material facing the room. This improves the 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 if the support member 80 is heated in the event of a fire.

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

The wrap-around fire-resistant covering material 100 and the moisture-blocking 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-blocking 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-blocking effect can be enhanced for the cut surfaces of the wrap-around fire-resistant covering material 100 by attaching the moisture-blocking sheet 104 without any gaps after the wrap-around fire-resistant covering material 100 has been screwed to the fire-resistant board 70.

The moisture-proof sheet 104 can be provided as needed and can be omitted as appropriate.

(Synthetic fireproof coating structure)
1 and 2, the steel beam 10 is fire-resistant coated with a composite fire-resistant coating structure consisting 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 fire-resistant board 70 provides fire-resistant coating to the exterior side of the steel beam 10.

The beam-side wrapped fire-resistant coating material 110 is made from rock wool, ceramic wool, alkaline earth silicate wool, or other materials formed into sheets. It is preferable to use high-heat-resistant rock wool to ensure even higher fire resistance. This beam-side wrapped fire-resistant coating 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 passes under the steel beam 10, extending toward the fire-resistant board 70.

Specifically, the beam-side wrapped fire-resistant coating material 110 is bent overall into an L-shape when viewed in the axial direction of the steel beam 10. This beam-side wrapped fire-resistant coating material 110 has a side covering portion 112 that provides fire-resistant coating 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 coating to the bottom surface of the steel beam 10.

As shown in Figure 2, the side covering portion 112 is arranged along the beam direction of the steel beam 10 so as to cover the interior-facing side of the steel beam 10. The side covering portion 112 is also arranged across the upper flange portion 12 and 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.

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

The tip end 114T of the underside covering portion 114 is placed on the inner surface 70A of the fire-resistant board 70, over the moisture barrier sheet 104 and the wrapped fire-resistant covering material 100. The tip end 114T of the underside covering portion 114 is also pressure-bonded to the moisture barrier sheet 104 and the wrapped fire-resistant covering material 100. The space between the fire-resistant board 70 and the steel beam 10 is sealed by this underside covering portion 114.

Specifically, the tip end 114T of the beam-side wrapped fire-resistant covering material 110 (underside covering portion 114) and the wrapped fire-resistant covering material 100 are elastic. The tip end 114T of the beam-side wrapped fire-resistant covering material 110 and the wrapped fire-resistant covering material 100 are pressed together while being compressed in the thickness direction. The elastic force (resilience, repulsion force) and frictional force of the tip end 114T of the beam-side wrapped fire-resistant covering material 110 and the wrapped fire-resistant covering material 100 maintain the pressed-together state of the tip end 114T of the beam-side wrapped fire-resistant covering material 110 and the wrapped fire-resistant covering material 100.

The pressure applied to the tip end 114T of the beam-side wrapped fire-resistant covering material 110 and the wrapped fire-resistant covering material 100 is adjusted appropriately depending on the thickness of the tip end 114T of the beam-side wrapped fire-resistant covering material 110 and the wrapped fire-resistant covering material 100, the distance G from the welded fixing pin 116 to the wrapped fire-resistant covering material 100, and the vertical contact length L of the tip end 114T of the beam-side wrapped fire-resistant covering material 110 and the wrapped fire-resistant covering material 100.

In this embodiment, as an example, the thickness of the tip end 114T of the beam-side wrapped fire-resistant covering material 110 is 65 mm or more, and the thickness of the wrapped fire-resistant covering material 100 is 40 mm or more. Furthermore, the distance G from the welded fixing pin 116 to the wrapped fire-resistant covering material 100 is 170 mm or more. Furthermore, the vertical contact length L between the tip end 114T of the beam-side wrapped fire-resistant covering material 110 and the wrapped fire-resistant covering material 100 is 155 mm or more.

A fire resistance experiment was conducted using the above specifications, and it was confirmed that the crimped bonding strength of the wrapped fire-resistant coating material 100 and the beam-side wrapped fire-resistant coating material 110 was maintained after two hours of heating, effectively suppressing the temperature rise of the steel beam 10.

The tip end 114T of the wrapped fire-resistant covering material 100 (lower surface covering portion 114) may be fixed to the fire-resistant board 70 with, for example, screws. Alternatively, a steel plate may be installed on the interior side of the fire-resistant board 70, and the tip end 114T of the wrapped fire-resistant covering material 100 may be fixed to this with a welded fixing pin.

(effect)
Next, the operation of this embodiment will be described.

(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.

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 frame 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 frame side fasteners 20.

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

As a result, even if the mullions 52 and other components of the curtain wall unit 50U melt and burn during a fire, the fire-resistant board 70 is supported by the steel beam 10 via a 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.

Furthermore, as shown in FIG. 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. Therefore, even if the mullions 52 of the curtain wall unit 50U melt and burn during a fire, creating 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 through the space formed between adjacent fire-resistant boards 70 is prevented from penetrating into the room, improving the fire resistance of the steel beam 10.

Furthermore, as shown in Figure 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 therefore prevents the fire-resistant board 70 from falling off in the event of a fire.

Furthermore, the base portion 82 is fastened to the fire-resistant board 70 with multiple 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 thermally deteriorate during a fire, the weight of the fire-resistant board 70 could cause the lower end hook portion 84 to deform downward, potentially causing the fire-resistant board 70 to fall off.

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 multiple screws 90. This reduces the load acting from the fire-resistant board 70 on the lower hook portion 84. Therefore, even if the lower hook portion 84 is thermally deteriorated during a fire, downward deformation of the lower hook portion 84 is suppressed.

In addition, as mentioned above, the lower end hook portion 84 and 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 loose from the fire-resistant board 70.

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

In addition, the support member 80 is attached to the lower side of the fire-resistant board 70, not the upper side, so it can be easily attached to the fire-resistant board 70. This improves the workability of the fire-resistant board 70.

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 if the base portion 82 were 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.

Furthermore, if the fire-resistant board 70 is damaged after erecting the curtain wall unit 50U, replacing the fire-resistant board 70 is time-consuming. In contrast, in this 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, it can be easily replaced. This improves the ease of installation of the fire-resistant board 70.

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

As a result, the curtain wall unit 50U and the support members 80 are supported on the steel beam 10 via the mullions 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 beam 10 via separate fasteners.

The inner surface 70A, base 82, and screws 90 of the fire-resistant board 70 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, screws 90, and fire-resistant board 70 during a fire, thereby preventing a decrease in the bond strength between the screws 90 and the fire-resistant board 70. This further reduces the risk of the fire-resistant board 70 falling off during a fire.

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

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

Furthermore, as mentioned above, if the fire-resistant board 70 is damaged after erecting the curtain wall unit 50U, replacing the fire-resistant board 70 is time-consuming. In contrast, in this embodiment, as mentioned above, by wrapping the fire-resistant covering material 100 and the moisture barrier sheet 104 around the fire-resistant board 70 and fastening them with screws before erecting the curtain wall unit 50U, even if the fire-resistant board 70 is damaged, it can be easily replaced. This improves the ease of installation of the fire-resistant board 70.

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.

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 of the finishing material 72 on the interior side. In other words, the finishing material 72 also functions as a base material for the wrap-around fire-resistant covering material.

This allows, for example, the height of the fire-resistant board 70 to be kept to the height required to prevent fire from spreading to upper floors (e.g., 900 mm), while the wrapped fire-resistant covering material 100 extending downward from the inner surface 70A of the fire-resistant board 70 ensures thermal insulation performance below the fire-resistant board 70. This therefore reduces the material cost of the fire-resistant board 70.

(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.

The tip end 114T of the beam-side wrapped fire-resistant coating material 110 is pressure-bonded to the wrapped fire-resistant coating material 100 from above the moisture-proof sheet 104. As a result, the beam-side wrapped fire-resistant coating material 110 fills the space between the steel beam 10 and the fire-resistant board 70, and the beam-side wrapped fire-resistant coating material 110 and the fire-resistant board 70 provide a fire-resistant coating (composite fire-resistant coating) for the steel beam 10. This improves the fire resistance performance of the steel beam 10.

In addition, in this embodiment, the tip end 114T of the beam-side wrapped fire-resistant covering material 110 is crimped and joined to the wrapped fire-resistant covering material 100. As a result, in this embodiment, damage to the fire-resistant board 70 is suppressed and workability is improved compared to, for example, when the tip end 114T of the beam-side wrapped fire-resistant covering material 110 is fixed to the fire-resistant board 70 with screws.

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, heating the space between the fire-resistant board 70 and the steel beam 10. In this case, the fire resistance performance of the steel beam 10 (e.g., 1- to 3-hour fire resistance) may be reduced.

In contrast, 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 (e.g., 1- to 3-hour fire resistance).

(Modification)
Next, a modification of the above embodiment will be described.

In the modified example shown in Figures 7(A) and 7(B), side edge hook portions 92 that hold the side edges of the fire-resistant board 70 in the width direction 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.

As a result, the side end hook portions 92 and the base portion 82 hold the side ends of the fire-resistant board 70 from both out-of-plane sides. 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. Note that in this modified example, the base portion 82 is not fastened with screws.

In addition, in the above embodiment, as shown in Figure 6, the joints M between the ends 100E of adjacent wrap-around fire-resistant covering materials 100 on the left and right are formed linearly in a plan view. However, for example, as in the modified example shown in Figure 8, the ends 100E of adjacent wrap-around fire-resistant covering materials 100 on the left and right may be joined with a rib (half-joint).

In the overlapping joint, the thickness of the ends 100E of adjacent wrap-around fire-resistant covering materials 100 is roughly halved, and the ends 100E are combined by overlapping each other in the thickness direction. This causes the joints M between the ends 100E of the wrap-around fire-resistant covering materials 100 to bend in a crank shape when viewed from above. As a result, in the event of a fire, the heat of the fire that penetrates into the room through the joints M is reduced.

In addition, in the above embodiment, as shown in Figure 6, the joints M of the ends 100E of adjacent wrap-around fire-resistant covering materials 100 on the left and right are located on the indoor side of the mullions 52. However, as in the modified example shown in Figure 9, for example, the joints M of the ends 100E of adjacent wrap-around fire-resistant covering materials 100 on the left and right may be located on the indoor side of one of the fire-resistant boards 70 (the right side in Figure 9). In this way, one of the fire-resistant boards 70 covers the joints M from the outdoor side. As a result, in the event of a fire, the heat of the fire that penetrates into the indoor side through the joints M is reduced.

Furthermore, for example, as in the modified example shown in Figure 10, if the inner surface 52S of the mullion 52 is located closer to the room than the outer surface 70B of the fire-resistant board 70 and closer to the room than the inner surface 70A of the fire-resistant board 70, a pair of wrap-around fire-resistant covering materials 130 for the mullion may be provided at the ends 100E of adjacent wrap-around fire-resistant covering materials 100.

The pair of wrap-around fire-resistant covering materials 130 for mullions are formed from rock wool, ceramic wool, alkaline earth silicate wool, or the like, formed into sheets, just like the wrap-around fire-resistant covering material 100. The pair of wrap-around fire-resistant covering materials 130 for mullions are overlapped on the ends 100E of adjacent wrap-around fire-resistant covering materials 100 and fastened to the fire-resistant board 70 with screws 106. When rock wool is used for the wrap-around fire-resistant covering materials 130 for mullions, fire resistance can be further improved by using high-heat-resistant rock wool.

In addition, a pair of wrap-around fire-resistant covering materials 130 for mullions each extend from the ends 100E of adjacent wrap-around fire-resistant covering materials 100 toward the mullions 52, and the ends 130E are in contact or pressed against each other on the indoor side of the mullions 52, forming a joint M between them. As a result, even if the mullions 52 melt and burn during a fire, creating a space between adjacent fire-resistant boards 70, the space will be shielded by the pair of wrap-around fire-resistant covering materials 130 for mullions.

The ends 130E of a pair of wrap-around fire-resistant covering materials 130 for mullions may be joined using the interlocking technique described above. Furthermore, of two adjacent wrap-around fire-resistant covering materials 100 on the left and right, one of the wrap-around fire-resistant covering materials 100 for mullions may be provided with a wrap-around fire-resistant covering material 130 for mullions that spans from the one wrap-around fire-resistant covering material 100 to the other wrap-around fire-resistant covering material 100.

In addition, in the above embodiment, the curtain wall unit 50U is supported on the steel beam 10 via the upright side fasteners 60 and the frame side fasteners 20. However, the curtain wall unit 50U may also be supported on, for example, the slab 40 via the upright side fasteners 60 and the frame side fasteners 20.

In addition, 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.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment. One embodiment and various modified embodiments may be used in appropriate combination, and the present invention can of course be implemented in various forms without departing from the spirit of the present invention.

10 Steel beams (frame)
40 Slab (body)
50 Curtain wall 52 Mullet 52S Inner surface (inner surface of the room side of the mullion)
70 Fireproof board 70A inner surface (inner surface of the fireproof board on the indoor side)
72 Finishing material 80 Support member 82 Base portion 84 Lower end hook portion 90 Screw 100 Wrapping fire-resistant covering material 100E End portion (end portion of wrapping fire-resistant covering material)
104 Moisture-proof sheet 110 Beam-side wrapped fire-resistant covering material 114T Tip side (tip side of beam-side wrapped fire-resistant covering material)
130: 130E end of a wrap-around fire-resistant covering material for a mullion (end of a wrap-around fire-resistant covering material for a mullion)

Claims (9)

A curtain wall placed on the exterior side of the building structure;
a fire-resistant board provided on the curtain wall;
a winding fireproof covering material attached to the inner surface of the fireproof board on the indoor side and covering the inner surface from one end side to the other end side in the width direction of the fireproof board;
A fire-resistant board thermal insulation structure for curtain walls. The wrapped fire-resistant covering material is fastened to the fire-resistant board with screws.
The fire-resistant board heat-insulating structure for curtain walls according to claim 1. A moisture-proof sheet is attached to the inner surface of the wrapping fire-resistant covering material on the indoor side and covers the inner surface.
The fire-resistant board heat-insulating structure for curtain walls according to claim 1 or 2. a support member having 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 on the side of the frame, and is supported by the frame;
The wrapped fire-resistant covering material covers the inner surface of the fire-resistant board from above the base portion.
The fireproof board heat insulating structure for curtain walls according to any one of claims 1 to 3. The curtain wall has a mullion arranged along a side edge of the fire-resistant board in a width direction,
The end of the upright side of the wrapped fire-resistant covering material extends toward the upright side and covers the inner surface of the upright on the indoor side.
The fireproof board heat insulating structure for curtain walls according to any one of claims 1 to 4. The curtain wall has a mullion arranged along a side edge of the fire-resistant board in a width direction,
A mullion-wrapped fire-resistant covering material is provided on the end of the mullion-side of the wrapped fire-resistant covering material, which is screwed in a state where it is overlapped on the end, and which extends to the mullion-side and covers the inner surface of the room-side of the mullion.
The fireproof board heat insulating structure for curtain walls according to any one of claims 1 to 4. The curtain wall and the wrap-around fire-resistant covering material are respectively arranged on both sides of the mullion,
The ends of the wrap-around fire-resistant covering material on both sides or the ends of the wrap-around fire-resistant covering material for the mullion on both sides are joined together on the indoor side of the mullion,
The fire-resistant board heat-insulating structure for curtain walls according to claim 6. a finishing material covering the exterior surface of the fireproof board on the outdoor side and extending downward from the fireproof board;
The wrapped fire-resistant covering material extends downward from the inner surface of the fire-resistant board and covers the inner surface of the finishing material facing the interior of the building.
The fireproof board heat insulating structure for curtain walls according to any one of claims 1 to 7. A fire-resistant board heat-insulating structure for curtain walls according to any one of claims 1 to 8,
a beam-side wrapped fire-resistant covering material that extends from the opposite side of the fire-resistant board of the steel beam that constitutes the skeleton toward the fire-resistant board, passing under the steel beam, and whose protruding tip side is pressure-bonded to the wrapped fire-resistant covering material;
A synthetic fire-resistant coated structure.