JP2023098188A - Fireproof board insulation structure for curtain wall and composite fireproof covering structure - Google Patents

Abstract

An object of the present invention is to improve the heat insulation performance of a fireproof board provided in a curtain wall while improving workability. A fireproof board insulation structure for a curtain wall includes: a curtain wall 50 arranged on the outdoor side of a steel beam 10; a fireproof board 70 provided on the curtain wall 50; [Selection drawing] Fig. 1

Description

The present invention relates to refractory board insulation structures for curtain walls and composite refractory cladding structures.

A fire-resistant structure in which a curtain wall is provided with a fire-resistant board is known (see Patent Documents 1 to 4, for example).

JP 2014-173379 A JP 2011-202353 A JP 2010-001646 A JP 2006-291621 A

By the way, there are cases where a fireproof board provided in a curtain wall is required to have heat insulation performance. In this case, after erecting the curtain wall and the fireproof boards, it is conceivable to spray rock wool on the inner surface of the fireproof boards on the indoor side at the site.

However, the application of sprayed rock wool is labor intensive. Further, for example, when the construction space between the fire-resistant board and the beam installed on the indoor side of the fire-resistant board is narrow, it is difficult to apply the sprayed rock wool.

SUMMARY OF THE INVENTION In view of the above facts, it is an object of the present invention to improve the heat insulation performance of a fireproof board provided in a curtain wall while improving workability.

The fireproof board insulation structure for a curtain wall according to claim 1 comprises a curtain wall arranged on the outdoor side of a building frame, a fireproof board provided on the curtain wall, and attached to the inner surface of the fireproof board on the indoor side. and a wound fireproof coating material that coats the inner surface from one end side to the other end side in the width direction of the fireproof board.

According to the fireproof board insulation structure for curtain wall according to claim 1, the curtain wall is arranged on the outdoor side of the frame. The curtain wall is provided with fireproof boards. A wrap-around fireproof covering is attached to the interior surface of the fireproof board on the indoor side.

Here, the wrapped refractory covering material has not only fire resistance performance but also heat insulation performance. By covering the inner surface of the indoor side of the fireproof board with this wound fireproof covering material from one end side to the other end side in the width direction of the fireproof board, the heat insulation performance of the fireproof board is enhanced.

Also, the wrap-around refractory cladding can be attached to the inside surface of the interior of the refractory board prior to erection of the curtain wall and refractory board. Therefore, regardless of the presence or absence of construction space between the fire-resistant board and the beam installed indoors of the fire-resistant board, the fire-resistant board can be attached to the inner surface of the indoor side of the fire-resistant board.

As described above, in the present invention, it is possible to improve the heat insulation performance of the fireproof board provided in the curtain wall while improving workability.

The fireproof board insulation structure for curtain wall according to claim 2 is the fireproof board heat insulation structure for curtain wall according to claim 1, wherein the wound fireproof covering material is screwed to the fireproof board.

According to the fireproof board insulation structure for curtain wall according to claim 2, the wound fireproof covering material is screwed to the fireproof board. Therefore, workability is improved.

In addition, screws have a higher holding power than adhesives and the like, and the holding power is less likely to decrease even when heated. Therefore, by screwing the wound fireproof covering material to the fireproof board, it is possible to prevent the wound fireproof covering material from coming off in the event of a fire.

The fireproof board heat insulation structure for curtain wall according to claim 3 is the fireproof board heat insulation structure for curtain wall according to claim 1 or claim 2, wherein the fireproof board heat insulation structure for curtain wall is attached to the inner surface of the indoor side of the wrapped fireproof covering material, Equipped with a moisture barrier sheet covering the inner surface.

According to the fireproof board insulation structure for curtain wall according to claim 3, the moisture barrier sheet is attached to the inner surface of the wrapped fireproof covering material on the indoor side. By covering the inner surface of the fireproof board on the indoor side with this moisture barrier sheet, the heat insulation performance of the fireproof board is further enhanced.

Also, the moisture barrier sheet can be attached to the fireproof board with the wrapped fireproof covering material by means of screws or the like after being attached to the wrapped fireproof covering material with an adhesive or the like in advance. Therefore, workability is improved.

The fireproof board heat insulation structure for curtain wall according to claim 4 is the fireproof board heat insulation structure for curtain wall according to any one of claims 1 to 3. , a lower end hook portion that holds the lower end portion 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 on the side of the building frame, A supported support member is provided, and the wrapped refractory cladding covers the inner surface of the refractory board over the base portion.

According to the fireproof board insulation structure for curtain wall according to claim 4, the support member includes a lower end hook portion that holds the lower end portion of the fireproof board, and a support member that extends upward from the lower end hook portion along the inner surface of the fireproof board on the skeleton side. and a protruding base portion, and is supported by the frame. By supporting the fireproof board with this support member, even if the curtain wall melts and burns down in the event of a fire, the fallout of the fireproof board is suppressed.

Additionally, the wrapped refractory cladding covers the inner surface of the refractory board over the base. This suppresses the temperature rise of the base portion in the event of a fire, thereby further suppressing the drop-off of the fireproof board in the event of a fire.

The fireproof board insulation structure for curtain wall according to claim 5 is the fireproof board heat insulation structure for curtain wall according to any one of claims 1 to 4, wherein the curtain wall extends in the lateral width direction of the fireproof board. and the mullion-side end of the wrapped refractory cladding extends toward the mullion and extends along the interior side of the mullion. cover.

According to the fireproof board heat insulation structure for curtain wall according to claim 5, the curtain wall has mullions. The mullions are arranged along the lateral side edges of the refractory board. In addition, the mullion-side end portion of the wound fireproof coating material extends toward the mullion and covers the inner surface of the mullion on the indoor side.

Here, for example, if the mullion melts and burns down in the event of a fire to form a space, fire heat may enter from the outdoor side of the fireproof board to the indoor side through the space.

On the other hand, in the present invention, as described above, the inner surface of the mullion is covered by the mullion-side end of the wound fireproof covering material. As a result, even if the mullion melts and burns down in the event of a fire to form a space, the space is shielded (heat shielded) by the mullion-side end of the wound fireproof covering material. Therefore, fire resistance is enhanced.

The fireproof board insulation structure for curtain wall according to claim 6 is the fireproof board heat insulation structure for curtain wall according to any one of claims 1 to 4, wherein the curtain wall extends in the lateral width direction of the fireproof board. A mullion arranged along the side edge of the wound fireproof covering material is screwed to the end of the mullion side of the wound refractory coating material in a state of being superimposed on the end, and the mullion A mullion wrap refractory cladding is provided extending to the standing side and covering the inner surface of the interior of the mullion.

According to the fireproof board insulation structure for curtain wall according to claim 6, the curtain wall has mullions. The mullions are arranged along the lateral side edges of the refractory board. In addition, a mulch-use wound fire-resistant coating is provided at the mulch-side end of the wrap-around fire-resistant coating. The wound refractory covering material for mullions is screwed in a state of being superimposed on the end portion of the mullion side of the wound refractory covering material, and extends to the mullion side to provide an inner surface of the indoor side of the mullion. cover the

Here, for example, if the mullion melts and burns down in the event of a fire to form a space, fire heat may enter from the outdoor side of the fireproof board to the indoor side through the space.

On the other hand, in the present invention, as described above, the inner surface of the room inside the mullion is covered with the mullion wrapping fireproof covering material. As a result, even if the mullion melts and burns down in the event of a fire to form a space, the space is shielded (heat shielded) by the wrapped refractory coating material for the mullion. Therefore, fire resistance is enhanced.

In addition, by providing the mullion-use wound fire-resistant covering material at the end of the mullion side of the wound fire-resistant covering material, for example, the inner surface of the mullion is more indoor than the outer surface of the fire-resistant board, and the fire-resistant The mullion wrap-around refractory cladding can cover the mullion's inner surface even if it is positioned further outside than the interior surface of the board.

The fireproof board heat insulation structure for curtain wall according to claim 7 is the fireproof board heat insulation structure for curtain wall according to claim 5 or claim 6, wherein the curtain wall and the wrapped fireproof covering material are arranged on the mullion. The ends of the wound refractory cladding on each side, or the ends of the mullion wrapped refractory cladding on both sides, are interlocked with each other inside the mullion.

According to the fireproof board insulation structure for curtain wall according to claim 7, the curtain wall and the wrapped fireproof covering material are arranged on both sides of the mullion. Also, the ends of the wrapped refractory cladding on both sides or the ends of the mulched wrapped refractory cladding on both sides are interlocked on the interior side of the mullion.

As a result, when a mullion melts and burns down to form a space in the event of a fire, from the joints at the ends of the wrapped refractory coating material on both sides, or from the joints at the ends of the wrapped refractory coating material for mullions on both sides , fire heat entering the room is suppressed. Therefore, the fire resistance is further enhanced.

The fireproof board heat insulation structure for curtain wall according to claim 8 is the fireproof board heat insulation structure for curtain wall according to any one of claims 1 to 7, in which the outer surface of the fireproof board on the outdoor side is covered. and a finish extending downwardly from the fire-resistant board, wherein the wrapped fire-resistant covering extends downwardly from the inner surface of the fire-resistant board and covers the interior interior surface of the finish.

According to the fireproof board heat insulation structure for curtain wall according to claim 8, the finishing material covers the outer surface of the fireproof board on the outdoor side. This improves the design of the curtain wall.

Also, the finish extends downwardly from the refractory board. On the other hand, the wrapped refractory covering material extends downward from the indoor-side inner surface of the fire-resistant board and covers the indoor-side inner surface of the finishing material. Thus, the finish also functions as a substrate for the wrapped refractory coating.

As a result, for example, while suppressing the height of the fireproof board to the height necessary to prevent the fire from spreading upward, the wrapped fireproof covering material extending downward from the inner surface of the fireproof board improves the insulation performance below the fireproof board. can be ensured. Therefore, the material cost of the fireproof board can be reduced.

The composite fireproof covering structure according to claim 9 is a curtain wall fireproof board insulation structure according to any one of claims 1 to 8, and a steel beam constituting the frame on the side opposite to the fireproof board. a beam-side wrapped fireproof covering material that extends from the steel frame beam to the side of the fireproof board, and the overhanging tip side is crimped and joined to the wrapped fireproof covering material.

According to the composite fireproof covering structure according to claim 9, the beam-side wrapped fireproof covering material passes under the steel beam from the opposite side of the steel beam to the fireproof board and protrudes toward the fireproof board, and the overhanging tip The sides are crimp bonded to the wrapped refractory cladding.

As a result, in the present invention, for example, as compared with the case where the front end side of the beam-side wrapped fireproof covering material is fixed to the fireproof board with screws, workability is improved and damage to the fireproof board is suppressed.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to improve the heat insulation performance of the fireproof board provided in the curtain wall while improving workability.

1 is a cross-sectional view showing a steel beam and a fireproof board for a curtain wall to which a fireproof board support structure according to one embodiment is applied; FIG. FIG. 2 is a partially enlarged sectional view of FIG. 1; FIG. 2 is an elevation view of the curtain wall unit and the fireproof board shown in FIG. 1 as seen from the interior side; 4 is a cross-sectional view taken along line 4-4 of FIG. 3; FIG. FIG. 2 is an elevation view of the curtain wall unit and the fireproof board shown in FIG. 1 as seen from the interior side; FIG. 3 is a cross-sectional plan view showing side-by-side mullions, refractory boards, and wrapped refractory cladding; (A) is an elevational view showing a fireproof board to which a modification of the fireproof board support structure according to one embodiment is applied, and a support member, and (B) is a line 7B-7B in FIG. 7(A). It is a sectional view. FIG. 10 is a cross-sectional plan view showing laterally adjacent mullions, fire-resistant boards, and wrapped fire-resistant coverings to which a modified example of the fire-resistant board support structure according to one embodiment is applied. FIG. 10 is a cross-sectional plan view showing laterally adjacent mullions, fire-resistant boards, and wrapped fire-resistant coverings to which a modified example of the fire-resistant board support structure according to one embodiment is applied. FIG. 10 is a cross-sectional plan view showing laterally adjacent mullions, fire-resistant boards, and wrapped fire-resistant coverings to which a modified example of the fire-resistant board support structure according to one embodiment is applied.

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

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

(Steel beam)
As shown in FIGS. 1 and 2, the steel beam 10 is made of 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 .

The steel beams 10 are arranged along the ends of the slabs 40 and support the ends of the slabs 40 . The slab 40 is made of reinforced concrete and forms a floor of a predetermined floor of a multi-story structure. A curtain wall 50 and a fireproof board 70 are installed on the outdoor side (arrow OUT side) of these steel beams 10 and slab 40 . Note that the steel beam 10 and the slab 40 are an example of a skeleton.

(curtain wall)
The curtain wall 50 is arranged on the outdoor side of the slab 40 over the upper and lower floors of the structure, and constitutes the outer wall (exterior) of the structure. The curtain wall 50 is formed like a wall by assembling a plurality of curtain wall units 50U arranged vertically and horizontally.

As shown in FIG. 3, the curtain wall unit 50U includes a pair of mullions 52, a plurality of (three in this embodiment) mullions 54 connecting the pair of mullions 52, the mullions 52, and the mullions 52. and a windowpane 56 (see FIG. 1) provided within the frame formed by the eye 54 . The mullion 52 and the mesh 54 are made of aluminum or the like, for example.

The curtain wall unit 50U has mullion-side fasteners 60, a fireproof board 70, a finish material 72, a pair of support members 80, a horizontal joint material 88, a wrapped fireproof covering material 100, and a moisture barrier sheet 104. As shown in FIG. These mullion-side fasteners 60, fireproof board 70, finishing material 72, pair of support members 80, horizontal joint material 88, wrapped fireproof coating material 100, and moisture barrier sheet 104 are, for example, a method of erecting the curtain wall unit 50U. It is attached to the curtain wall unit 50U in front.

Note that FIG. 3 omits illustration of a wound fireproof covering material 100 and a moisture barrier sheet 104, which will be described later.

(Body side fastener, cubic side fastener)
As shown in FIG. 2 , the mullion 52 is supported by the steel beam 10 via the skeleton-side fastener 20 and the mullion-side fastener 60 . The frame-side fastener 20 is formed of an L-shaped steel plate when viewed from the side. Further, the skeleton-side fastener 20 is reinforced with ribs 21 . A lateral flange portion 22 of the frame-side fastener 20 is joined to the upper surface of a bracket 18 provided on the steel frame beam 10 with a bolt 26 and a nut 28 .

Note that the bracket 18 is arranged in a notch 42 formed at the end of the slab 40 . It is also possible to omit the brackets 18 and fix the skeleton-side fasteners 20 to the steel beams 10 .

The vertical flange portion 24 of the frame-side fastener 20 is arranged to face the inner side surface 52S of the mullion 52 on the indoor side. A mullion side fastener 60 is joined to the vertical flange portion 24 with a bolt 30 and a nut 32 .

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

The mullion-side fastener 60 is fixed to the interior side surface 52S of the mullion 52 with a bolt 64 . A vertically intermediate portion of the mullion-side fastener 60 protrudes into the interior of the vehicle in a convex shape. A storage chamber 62 is formed in an intermediate portion of the mullion-side fastener 60 to store the nut 32 described above in a non-rotatable manner. By tightening the bolt 30 to the nut 32 , the mullion side fastener 60 is joined to the frame side fastener 20 .

A mounting portion 86 of a support member 80 , which will be described later, is joined (fastened together) to the mullion-side fastener 60 by a bolt 30 and a nut 32 .

A bolt hole (not shown) for the bolt 30 formed in the vertical flange portion 24 is an elongated hole extending in the vertical direction. Further, the mullion-side fastener 60 is provided with a height adjusting bolt 66 that abuts on the upper end of the vertical flange portion 24 of the skeleton-side fastener 20 and adjusts the height of the mullion-side fastener 60 with respect to the skeleton-side fastener 20. It is

(fireproof board)
As shown in FIG. 1, the fireproof board (fireproof board for curtain wall) 70 is provided in the spandrel portion of the curtain wall unit 50U. The fireproof 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.

The fireproof board 70 is attached to the indoor side of the curtain wall unit 50U so as to face the window glass 56 . The outer periphery of the fireproof board 70 is held by the mullions 52 and the frame-shaped rails 58 provided along the meshes 54, and the like.

The fireproof boards 70 are arranged on the outdoor side of the slab 40 over the upper and lower floors of the structure, and are arranged with a space between them and the ends of the slab 40 . An interlayer closing material 44 such as rock wool is provided in this space. This prevents hot air and flames from flowing into the upper floor of the slab 40 from the space between the fireproof board 70 and the end of the slab 40 in the event of a fire.

(finishing material)
A finishing material 72 is provided on the outdoor side of the fireproof board 70 . The finishing material 72 is made of, for example, an aluminum composite plate and attached to the mullion 52 and the mulch 54 . The finishing material 72 covers the entire outer surface 70B of the fireproof board 70 on the outdoor side. As a result, the fireproof board 70 cannot be seen from the outdoor side of the curtain wall unit 50U.

The finishing material 72 extends below the lower end of the fireproof board 70 . The interior inner surface of the lower portion of the finishing material 72 is covered with a wound fireproof covering material 100 and a moisture barrier sheet 104, which will be described later. Note that the finishing material 72 may be provided as necessary, and can be omitted as appropriate.

(support member)
As shown in FIG. 3 , the pair of supporting members (supporting metal fittings) 80 are made of metal plates such as steel plates, and are spaced apart in the lateral width direction of the fireproof board 70 . Each support member 80 has a base portion 82 , a bottom hook portion 84 and a mounting portion 86 .

The base portion 82 is formed in a belt shape and arranged along the height direction (vertical direction) of the fireproof board 70 . The base portion 82 is arranged along the inner surface 70A of the fireproof board 70 on the room side (steel beam 10 side). The base portion 82 is screwed to the fireproof board 70 with a plurality of screws 90 .

Note that the arrangement of the screws 90 can be changed as appropriate. Also, the base portion 82 can be fixed to the fireproof board 70 with at least one screw 90 . Furthermore, the screws 90 may be provided as required and can be omitted as appropriate. In addition, as will be described later, the support member 80 is covered with a fire-resistant wrapping material 100 or the like to prevent a decrease in strength in the event of a fire, thereby increasing the support capacity of the fire-resistant board 70 .

Further, for example, as shown in FIG. 4, when the aluminum mesh 54 is installed under the lower end hook portion 84, the lower end hook portion 84 may not be coated with fireproof. If the lower end hook portion 84 is heated without the fireproof coating, it becomes difficult to support the fireproof board 70 due to deformation and strength reduction, and the fireproof board 70 may fall off. As a countermeasure, the base portion 82 and the fireproof board 70 are fastened with screws 90 so that the weight of the fireproof board 70 can be supported by the base portion 82, thereby preventing the fireproof board 70 from coming off.

As shown in FIG. 4, the bottom end of the base portion 82 is provided with a bottom end hook portion 84 that holds the bottom end portion of the fireproof board 70 . The bottom end hook portion 84 is bent in an L shape in a side view, and the bottom end portion of the fireproof board 70 is inserted inside thereof.

The lower end hook portion 84 includes an extension portion 84A extending from the lower end portion of the base portion 82 to the outdoor side along the lower surface of the fireproof board 70, and an outer surface 70B of the outdoor side of the fireproof board 70 from the tip of the extension portion 84A. and a folded portion 84B extending upward along the .

The vertical length of the base portion 82 is preferably 1/2 or more of the height (vertical length) of the fireproof board 70, for example. Moreover, the vertical length of the folded portion 84B is preferably equal to or greater than the thickness of the fireproof board 70 .

Under the extending portion 84A of the lower end hook portion 84, the mesh 54 of the curtain wall unit 50U is arranged. This mesh 54 supports the lower end portion of the fireproof board 70 via the lower end hook portion 84 .

As shown in FIG. 3 , a mounting portion 86 is provided at the upper end portion of the base portion 82 . The mounting portion 86 extends from the upper end portion of the base portion 82 along the inner surface 70A of the fireproof board 70 toward the mullion 52 and is inserted into the storage chamber 62 (see FIG. 2) of the mullion-side fastener 60 .

As shown in FIG. 2 , the mounting portion 86 is joined (co-fastened) to the frame-side fastener 20 together with the mullion-side fastener 60 by a bolt 30 and a nut 32 . Thereby, the support member 80 is supported by the steel beam 10 via the mullion-side fastener 60 and the skeleton-side fastener 20 .

The mounting portion 86 is formed with a stepped portion (not shown) that absorbs a stepped portion between the inner surface 70A of the fireproof board 70 and the storage chamber 62 . Also, the mounting portion 86 may be joined to the skeleton-side fastener 20 by another bolt and nut instead of being fastened to the skeleton-side fastener 20 together with the bolt 30, the nut 32, and the mullion-side fastener 60. Furthermore, the support member 80 may be supported by the building frame such as the steel beam 10 or the slab 40 via fasteners different from the building frame-side fasteners 20 .

As shown in FIG. 3 , the base portions 82 of the pair of support members 80 are connected by a horizontal connecting member 88 . The horizontal connecting members 88 are made of metal plates such as steel plates, and are arranged along the inner surface 70A of the fireproof board 70 . By connecting the base portions 82 of the pair of support members 80 with the lateral connecting member 88, the rigidity of the pair of support members 80 is enhanced.

Note that the horizontal connecting material 88 may be provided as required, and can be omitted as appropriate.

(Wrapped refractory coating material)
As shown in FIG. 5, the inner surface 70A of the refractory board 70 is covered with a wrapped refractory covering 100. As shown in FIG. The wound refractory covering material 100 is made of sheet-shaped rock wool, ceramic wool, alkaline earth silicate wool, or the like. This wound fireproof covering material 100 has fireproof performance and heat insulating performance. In addition, by using a highly heat-resistant rock wool for the wound fire-resistant covering material 100, the fire-resistant performance can be further enhanced.

The wound fireproof covering material 100 extends from one end side to the other end side in the width direction of the fireproof board 70 and covers the entire inner surface 70A of the fireproof board 70 . As a result, the fireproof performance and heat insulation performance of the fireproof board 70 are enhanced.

The wound fireproof covering material 100 covers the inner surface 70A of the fireproof board 70 from above the base portion 82 of the support member 80 and the screws 90 (see FIG. 3). In other words, the wound fireproof coating material 100 coats the base portion 82 and the screws 90 of the support member 80 with a fireproof coating.

In the present embodiment, as shown in FIG. 4, the extending portion 84A of the lower end hook portion 84 and the fireproof coating of the folded portion 84B are omitted, but the extending portion 84A of the lower end hook portion 84 and It is also possible to coat the folded portion 84B with a fireproof coating.

As shown in FIG. 5 , the lateral ends 100E of the wound fireproof covering material 100 extend from the fireproof board 70 toward the mullion 52 and cover the inner surface 52S of the mullion 52 . A notch 102 for exposing the mullion-side fastener 60 is formed at an end portion 100E of the wound refractory coating material 100 in the width direction. The mullion-side fastener 60 is coated with a fire-resistant coating material (not shown).

As shown in FIG. 6, the mullions 52 in the left and right adjacent curtain wall units 50U are assembled together. At this time, the ends 100E of the adjacent wound refractory coating materials 100 are brought into contact or pressed against each other, and joints M are formed therebetween. As a result, even if the mullion 52 melts and burns down in the event of a fire and a space is formed between the adjacent fireproof boards 70, the space is shielded by the end portion 100E of the wound fireproof covering material 100. FIG.

In this embodiment, the inner surface 70A of the fireproof board 70 and the inner surface 52S of the mullion 52 are substantially flush with each other. There may be steps in the In addition, the mullion 52 is not limited to the wound fire-resistant coating material 100, and may be coated with a fire-resistant coating material other than the wound fire-resistant coating material 100, such as a spray-type fire-resistant coating such as sprayed rock wool. .

As shown in FIG. 1, the wrapped refractory cladding 100 extends downwardly from the inner surface 70A of the refractory board 70 and covers the interior interior surface of the lower portion of the finish. Thereby, the heat insulating performance of the finishing material 72 is enhanced. The wrapped fireproof covering material 100 also serves to prevent the support member 80 from being heated in the event of a fire and the fireproof board 70 falling off.

(moisture barrier sheet)
As shown in FIGS. 1 and 5, a moisture barrier sheet 104 is attached to the inner surface of the wound fireproof covering material 100 on the indoor side to cover the inner surface. The moisture barrier sheet 104 is formed of, for example, an aluminum sheet or the like having moisture barrier properties. By covering the inner surface of the wound fireproof covering material 100 with this moisture barrier sheet 104, the heat insulation performance of the wound fireproof covering material 100 and the finishing material 72 is enhanced.

The wound fireproof coating material 100 and the moisture barrier sheet 104 are screwed to the fireproof board 70 with a plurality of screws 106, for example, before the curtain wall unit 50U is erected. The pitch of these screws 106 is, for example, 300 mm or less. Also, the moisture barrier sheet 104 is attached in advance to the wound fireproof covering material 100 with an adhesive or the like, and fixed together with the wound fireproof covering material 100 to the fireproof board 70 with screws. For the cut surface of the wound fireproof coating material 100, the moisture barrier effect can be enhanced by attaching the moisture barrier sheet 104 without gaps after screwing the wound fireproof coating material 100 to the fireproof board 70. - 特許庁

Note that the moisture barrier sheet 104 may be provided as necessary, and can be omitted as appropriate.

(Synthetic fireproof coating structure)
As shown in FIGS. 1 and 2, the steel beam 10 is refractory-clad with a composite refractory cladding structure of refractory boards 70 and beam-side wrap refractory cladding 110 . Specifically, the fireproof board 70 is arranged on the outdoor side (arrow OUT side) of the steel beam 10 and faces the outdoor side of the steel beam 10 . The fireproof board 70 coats the side surface of the steel beam 10 on the outdoor side with a fireproof coating.

The beam-side wrapped refractory covering material 110 is made of sheet-shaped rock wool, ceramic wool, alkaline earth silicate wool, or the like. In addition, it is desirable to use high heat-resistant rock wool as the rock wool in order to ensure higher fire resistance. This beam-side wrapped fireproof covering material 110 coats the side surface of the steel beam 10 opposite to the fireproof board 70 (the arrow IN side) and the lower surface of the steel beam 10 with fireproofing, and passes under the steel beam 10 to provide fireproofing. It protrudes to the board 70 side.

Specifically, the beam-side wrapped fireproof coating material 110 is bent in an L shape as a whole when viewed from the material axis direction of the steel frame beam 10 . The beam-side wrapping fireproof covering material 110 has a side covering portion 112 for fireproof covering the indoor side surface of the steel beam 10 and a lower surface covering portion 114 for fireproof covering the lower surface of the steel beam 10 .

As shown in FIG. 2 , the side surface covering portion 112 is arranged along the beam forming direction of the steel beam 10 so as to cover the indoor side surface of the steel beam 10 . The side covering portion 112 is arranged over the upper flange portion 12 and the lower flange portion 14 of the steel beam 10, and the upper end side thereof is attached to the end portion of the upper flange portion 12 by a welding fixing pin 116. there is

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 extends from the lower end portion of the side surface covering portion 112 along the lower surface of the lower flange portion 14 toward the fireproof board 70 side. The lower surface covering portion 114 is attached to the lower surface of the lower flange portion 14 by a welding fixing pin 116 .

The tip side 114T of the lower surface covering portion 114 is overlaid on the inner surface 70A of the fireproof board 70 from above the moisture barrier sheet 104 and the wound fireproof covering material 100 . Further, the tip side 114T of the lower surface covering portion 114 is pressure-bonded to the moisture barrier sheet 104 and the wound fireproof covering material 100. As shown in FIG. The space between the fireproof board 70 and the steel beam 10 is blocked by the lower surface covering portion 114 .

Specifically, the tip side 114T of the beam-side wrapped fireproof covering material 110 (lower surface covering portion 114) and the wrapped fireproof covering material 100 have elasticity. The tip side 114T of the beam-side wrapping fireproof coating material 110 and the wrapping fireproof coating material 100 are crimped while being compressed in the thickness direction. Then, due to the tip side 114T of the beam-side wrapped fireproof coating material 110, and the elastic force (restoring force, repulsive force) and frictional force of the wrapped fireproof coating material 100, the tip side 114T of the beam-side wrapped fireproof coating material 110, And the crimped state of the wound refractory covering material 100 is maintained.

In addition, the crimping force of the tip side 114T of the beam-side wrapping fireproof coating material 110 and the wrapping fireproof coating material 100 is determined by the thickness of the tip side 114T of the beam-side wrapping fireproof coating material 110 and the wrapping fireproof coating material 100. , the distance G from the welding fixing pin 116 to the wrapped fireproof coating material 100, the tip side 114T of the beam side wrapped fireproof coating material 110, and the vertical contact length L of the wrapped fireproof coating material 100. .

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

As a result of carrying out a fire resistance experiment with the above specifications, the crimping bonding strength of the wrapped fire-resistant coating material 100 and the beam-side wrapped fire-resistant coating material 110 was maintained for 2 hours of heating, and the temperature rise of the steel beam 10 was suppressed. It was confirmed that it can be effectively suppressed.

Note that the tip side 114T of the wound fireproof covering material 100 (lower surface covering portion 114) may be fixed to the fireproof board 70 with screws or the like, for example. Alternatively, a steel plate may be installed on the indoor side of the fireproof board 70, and the front end side 114T of the fireproof covering material 100 may be fixed by wrapping it with a welding fixing pin.

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

(Fireproof board support structure)
As shown in FIGS. 1 and 2, according to this embodiment, the curtain wall unit 50U and the fireproof board 70 attached to the spandrel portion of the curtain wall unit 50U are arranged on the outdoor side of the steel beam 10. ing.

The fireproof board 70 is supported by the steel frame beam 10 via the curtain wall unit 50U, the mullion side fastener 60, and the skeleton side fastener 20, and is supported by a pair of support members 80, the mullion side fastener 60, and the skeleton side fastener 20. It is supported by the steel beam 10 via.

As shown in FIG. 4, the support member 80 has a bottom hook portion 84 and a base portion 82 . A lower end portion of the fireproof board 70 is inserted inside the lower end hook portion 84 . The bottom end hook portion 84 supports the bottom end portion of the fireproof board 70 from below, and the bottom end hook portion 84 and the base portion 82 hold the bottom end portion of the fireproof board 70 from both sides in the out-of-plane direction.

As a result, even if the mullions 52 and the like of the curtain wall unit 50U are melted and burned in the event of a fire, the fireproof board 70 is attached to the steel beam 10 via the pair of support members 80, the mullion side fasteners 60, and the frame side fasteners 20. Supported. Therefore, falling off of the fireproof board 70 in the event of a fire is suppressed.

In addition, as shown in FIG. 6, the inner side surface 52S of the mullion 52 of the curtain wall unit 50U is covered with the widthwise end portion 100E of the wound fireproof covering material 100. As shown in FIG. Therefore, even if the mullions 52 and the like of the curtain wall unit 50U are melted and burned in the event of a fire and a space is formed between the adjacent fireproof boards 70, the space is shielded by the end portion 100E of the wrapped fireproof covering material 100. be done. Therefore, the fire heat entering the interior of the room is absorbed from the space formed between the adjacent fireproof boards 70, so that the fireproof performance of the steel frame beam 10 is improved.

Further, as shown in FIG. 4 , the base portion 82 of the support member 80 extends upward from the bottom end hook portion 84 along the inner surface of the fireproof board 70 on the steel beam 10 side. This base portion 82 further suppresses inclination of the fireproof board 70 toward the steel beam 10 . Therefore, falling off of the fireproof board 70 in the event of a fire is suppressed.

Furthermore, the base portion 82 is screwed to the fireproof board 70 with a plurality of screws 90 . Here, if the fireproof board 70 is not screwed to the base portion 82, the lower end hook portion 84 will be deformed downward by the load of the fireproof board 70 when the lower end hook portion 84 is thermally degraded in the event of a fire, and the fireproof board 70 will be removed. It may fall off.

On the other hand, in this embodiment, as described above, the base portion 82 is screwed to the fireproof board 70 , and the fireproof board 70 is supported by the base portion 82 via a plurality of screws 90 . As a result, the load acting on the lower end hook portion 84 from the fireproof board 70 is reduced. Therefore, even if the bottom end hook portion 84 is thermally deteriorated in the event of a fire, downward deformation of the bottom end hook portion 84 is suppressed.

Further, as described above, the lower end hook portion 84 and the base portion 82 constrain the movement of the lower end portion of the fireproof board 70 in the out-of-plane direction. is alleviated. Therefore, the screws 90 are prevented from coming off from the fireproof board 70 .

Furthermore, the screw 90 has a higher holding power than an adhesive or the like, and the holding power is less likely to decrease even when heated. Therefore, falling off of the fireproof board 70 in case of fire is further suppressed.

Moreover, since the support member 80 is attached to the lower side of the fireproof board 70 and not attached to the upper side of the fireproof board 70 , it can be easily attached to the fireproof board 70 . Therefore, the workability of the fireproof board 70 is improved.

Further, in this embodiment, the base portion 82 of the support member 80 is screwed to the fireproof board 70 before the curtain wall unit 50U is erected. Therefore, in the present embodiment, compared to the case where the base portion 82 is screwed to the fireproof board 70 after the curtain wall unit 50U is erected, the base portion 82 is screwed to the fireproof board 70 in a state that facilitates construction. be able to. Therefore, damage to the fireproof board 70 is suppressed.

Further, if the fireproof board 70 is damaged after the curtain wall unit 50U is erected, it takes time and effort to replace the fireproof board 70 . On the other hand, in this embodiment, by screwing the base portion 82 to the fireproof board 70 before erecting the curtain wall unit 50U, even if the fireproof board 70 is damaged, the fireproof board 70 can be easily replaced. can do. Therefore, the workability of the fireproof board 70 is improved.

Further, the mounting portion 86 of the support member 80 is inserted into the storage chamber 62 of the mullion-side fastener 60 before the curtain wall unit 50U is erected. In this state, the curtain wall unit 50U is erected. When joining the mullion-side fastener 60 to the skeleton-side fastener 20 , the mullion-side fastener 60 and the mounting portion 86 of the support member 80 are fastened together to the skeleton-side fastener 20 with the bolt 30 and the nut 32 .

As a result, the curtain wall unit 50U and the support member 80 are supported by the steel beam 10 via the mullion-side fasteners 60 and the frame-side fasteners 20 . Therefore, in this embodiment, the workability of the fireproof board 70 is improved compared to the case where the mullion 52 and the support member 80 are supported by the steel beam 10 via separate fasteners.

In addition, the inner surface 70A of the fireproof board 70, the base portion 82 and the screws 90 are covered with the wound fireproof covering material 100 and the moisture barrier sheet 104. As shown in FIG. As a result, the temperature rise of the base portion 82, the screws 90, and the fireproof board 70 in the event of a fire is reduced, so that the reduction in the joint strength between the screws 90 and the fireproof board 70 is suppressed. Therefore, falling off of the fireproof board 70 in case of fire is further suppressed.

Furthermore, the wound fireproof covering material 100 and the moisture barrier sheet 104 are screwed to the inner surface 70A of the fireproof board 70 before the curtain wall unit 50U is erected. Accordingly, in this embodiment, after the curtain wall unit 50U is erected, the fireproof covering material 100 is wrapped around the inner surface 70A of the fireproof board 70 and screwed, or the inner surface 70A of the fireproof board 70 is sprayed with rock wool. Compared to , the workability is improved.

Further, when the distance (construction space) between the fireproof board 70 and the steel frame beam 10 is narrow, after the curtain wall unit 50U is erected, the wrapped fireproof coating material 100 or the sprayed rock wool is applied to the inner surface 70A of the fireproof board 70. Construction can be difficult. In such a case, this embodiment is particularly effective.

Furthermore, as described above, if the fireproof board 70 is damaged after erecting the curtain wall unit 50U, it takes time and effort to replace the fireproof board 70 . On the other hand, in the present embodiment, as described above, before the curtain wall unit 50U is erected, the fireproof coating material 100 is wound around the fireproof board 70, and the moisture barrier sheet 104 is screwed, so that the fireproof board 70 Even if the fireproof board 70 is damaged, the fireproof board 70 can be easily replaced. Therefore, the workability of the fireproof board 70 is improved.

A finishing material 72 is provided on the outdoor side of the fireproof board 70 . The finishing material 72 covers substantially the entire outer surface 70B of the fireproof board 70 . This improves the design of the curtain wall unit 50U.

In addition, a finish 72 extends downwardly from the refractory board 70 . In addition, the wrapped fireproof covering material 100 extends downward from the inner surface 70A of the fireproof board 70 and also covers the inner surface 70A of the finishing material 72 on the interior side. Thus, the finish 72 also functions as a substrate for the wrapped refractory cladding.

As a result, for example, the wrapped fireproof covering material 100 extending downward from the inner surface 70A of the fireproof board 70 while suppressing the height of the fireproof board 70 to a height (for example, 900 mm) necessary for preventing the spread of fire upwards. Thus, the heat insulation performance below the fireproof board 70 can be ensured. Therefore, the material cost of the fireproof board 70 can be reduced.

(Synthetic fireproof coating structure)
As shown in FIG. 1 , the fireproof board 70 of this embodiment constitutes a composite fireproof covering structure for the steel beam 10 together with the beam-side wrapping fireproof covering material 100 . Specifically, the beam-side wrapped fireproof coating material 110 extends from the opposite side of the steel frame beam 10 to the fireproof board 70 through under the steel frame beam 10 toward the fireproof board 70 side.

The tip side 114T of the beam-side wrapped fireproof coating material 110 is pressure-bonded to the wrapped fireproof coating material 100 from above the moisture barrier sheet 104 . As a result, the space between the steel frame beam 10 and the fireproof board 70 is blocked by the beam-side wrapping fireproof coating material 110, and the beam-side wrapping fireproof coating material 110 and the fireproof board 70 cover the steel frame beam 10 with fireproof coating (synthetic fireproof coating). Therefore, the fire resistance of the steel beam 10 is improved.

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

In the event of a fire, when the fireproof board 70 is heated from the outdoor side, the temperature of the inner surface 70A of the fireproof board 70 rises, and the space between the fireproof board 70 and the steel beam 10 is heated. In this case, the fire resistance of the steel beam 10 (for example, fire resistance for 1 to 3 hours) may deteriorate.

On the other hand, in this embodiment, the inner surface 70A of the fireproof board 70 is covered with the wound fireproof covering material 100 and the moisture barrier sheet 104, as described above. As a result, even if the fireproof board 70 is heated from the outdoor side during a fire, the temperature rise in the space between the fireproof board 70 and the steel beam 10 is reduced. Therefore, the fire resistance of the steel beam 10 (for example, fire resistance for 1 to 3 hours) can be ensured.

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

In the modification shown in FIGS. 7A and 7B, the base portion 82 of the support member 80 is provided with side end hook portions 92 for holding the lateral end portions of the fireproof board 70. there is The side end hooks 92 are arranged along the side ends of the fireproof board 70 . Moreover, the side end hook portion 92 is formed in an L shape in a cross-sectional view. A side end of the fireproof board 70 is inserted inside the side end hook portion 92 .

As a result, the side end portions of the fireproof board 70 are held from both sides in the out-of-plane direction by the side end hook portions 92 and the base portion 82 . Therefore, inclination of the fireproof board 70 toward the indoor side and the outdoor side is suppressed. Therefore, falling off of the fireproof board 70 in the event of a fire is suppressed. It should be noted that screwing of the base portion 82 is omitted in this modified example.

Further, in the above embodiment, as shown in FIG. 6, the joints M at the ends 100E of the wound fireproof coating materials 100 adjacent to each other on the left and right are formed linearly in a plan view. However, for example, as in the modification shown in FIG. 8, the ends 100E of the wound fireproof coating materials 100 adjacent to each other on the left and right sides may be combined by interlacing (interlacing).

In the phase jerking, the thickness of the end portions 100E of the adjacent wound fireproof coating materials 100 is made approximately half, and the end portions 100E are combined by overlapping each other in the thickness direction. As a result, the joints M between the ends 100E of the wound fireproof coating material 100 are bent in a crank shape in plan view. As a result, fire heat entering the room through the joints M is reduced in the event of a fire.

In the above-described embodiment, as shown in FIG. 6 , the joints M of the ends 100E of the wound fireproof coating materials 100 adjacent to each other on the left and right are positioned on the indoor side of the mullion 52 . However, for example, as in the modified example shown in FIG. 9, the joints M of the ends 100E of the wound fireproof covering materials 100 that are adjacent to each other on the left and right are located on the indoor side of the fireproof board 70 on one side (on the right side in FIG. 9). You can make it work. Thereby, the joint M is covered with one fireproof board 70 from the outdoor side. As a result, fire heat entering the room through the joints M is reduced in the event of a fire.

Further, for example, as in the modified example shown in FIG. 10, the inner side surface 52S of the mullion 52 is positioned on the indoor side of the outer surface 70B of the fireproof board 70 and on the outdoor side of the inner surface 70A of the fireproof board 70. In that case, a pair of mulch wrap fireproof covering materials 130 may be provided at the ends 100E of the adjacent wrap around fireproof covering materials 100 .

The pair of mulch wound refractory covering materials 130 are made of sheet-shaped rock wool, ceramic wool, alkaline earth silicate wool, or the like, like the wound refractory covering material 100 . The pair of wound refractory covering materials 130 for mulch are screwed to the fireproof board 70 with screws 106 in a state of being superimposed on the ends 100E of the adjacent winding refractory covering materials 100 . In addition, when rock wool is used for the winding fireproof coating material 130 for mullions, fire resistance can be further improved by using highly heat-resistant rock wool.

In addition, the pair of mullion wound fire-resistant covering materials 130 extend from the ends 100E of the adjacent winding fire-resistant covering materials 100 to the mullion 52 side, and on the indoor side of the mullion 52, each end 130E are in contact or pressure contact with each other, and a joint M is formed therebetween. As a result, even if the mullions 52 are melted and burned in the event of a fire and a space is formed between the adjacent fireproof boards 70, the space is shielded by the pair of winding fireproof coating materials 130 for the mullion.

Note that the ends 130E of the pair of mulch wound fireproof covering materials 130 may be combined by the above-described interlocking. In addition, of the wound fire-resistant coating materials 100 adjacent to each other in the left and right, on one of the wound fire-resistant coating materials 100, from the one wound fire-resistant coating material 100 to the other wound fire-resistant coating material 100. A fire resistant coating 130 may be provided.

Further, in the above-described embodiment, the curtain wall unit 50U is supported by the steel frame beam 10 via the mullion-side fasteners 60 and the frame-side fasteners 20 . However, the curtain wall unit 50U may be supported by the slab 40 via the mullion side fasteners 60 and the frame side fasteners 20, for example.

In the above embodiment, the fireproof board 70 and the beam-side wrapped fireproof covering material 110 constitute the composite fireproof covering structure of the steel beam 10 . However, the fire-resistant coating material on the steel beam 10 side is not limited to the beam-side wound fire-resistant coating material 110. For example, a sprayed fire-resistant coating material such as sprayed rock wool, or a board-based fire-resistant coating material such as calcium silicate board mixed with fiber A coating material or the like may be used.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate. Of course, it can be implemented in various modes within a range not departing from the above.

10 Steel beam (framework)
40 Slab (framework)
50 curtain wall 52 mullion 52S inner surface (inside surface of mullion indoor)
70 fireproof board 70A inner surface (inner surface of the indoor side of the fireproof board)
72 Finishing material 80 Support member 82 Base part 84 Lower end hook part 90 Screw 100 Winding fireproof covering material 100E End (end of winding fireproof covering material)
104 Moisture barrier sheet 110 Beam side wrapping fireproof covering material 114T Tip side (tip side of beam side wrapping fireproof covering material)
130 mullion wrapped refractory covering 130E end (end of mulch wrapped refractory covering)

Claims (9)

A curtain wall placed on the outdoor side of the frame,
a fireproof board provided on the curtain wall;
a wrapped fireproof coating 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 fireproof board insulation structure for a curtain wall comprising: the wrapped refractory cladding is screwed to the refractory board;
The fireproof board insulation structure for curtain wall according to claim 1. A moisture barrier sheet is attached to the inner surface of the indoor side of the wrapped fireproof covering material and covers the inner surface.
The fireproof board insulation structure for a curtain wall according to claim 1 or 2. It has a lower end hook portion that holds the lower end portion 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 on the side of the building frame, and is supported by the building frame. a support member that
The wrapped refractory covering covers the inner surface of the refractory board from above the base.
The fireproof board insulation structure for a curtain wall according to any one of claims 1 to 3. The curtain wall has a mullion arranged along a lateral edge of the fireproof board,
the mullion-side end of the wrapped refractory covering extends toward the mullion and covers the interior surface of the mullion indoors;
The fireproof board insulation structure for a curtain wall according to any one of claims 1 to 4. The curtain wall has a mullion arranged along a lateral edge of the fireproof board,
The wound refractory coating material is screwed to the end of the mullion side while being superimposed on the end, and extends to the mullion side to cover the inner surface of the room inside the mullion. A wraparound refractory covering for the mullion is provided,
The fireproof board insulation structure for a curtain wall according to any one of claims 1 to 4. the curtain wall and the wrapped refractory cladding are positioned on opposite sides of the mullion, respectively;
the ends of the wrapped refractory cladding on either side or the ends of the mullion wrapped refractory cladding on both sides are interlocked inside the mullion;
The fireproof board insulation structure for curtain walls according to claim 5 or 6. A finishing material covering the outer surface of the outdoor side of the fireproof board and extending downward from the fireproof board,
The wrapped refractory cladding extends downward from the inner surface of the refractory board and covers the interior interior surface of the finish material.
The fireproof board insulation structure for curtain wall according to any one of claims 1 to 7. A fireproof board heat insulation structure for a curtain wall according to any one of claims 1 to 8;
Beam-side windings that project from the opposite side of the fireproof board to the fireproof board side of the steel beams that constitute the frame, passing under the steel frame beams, and that the overhanging tip side is crimped and joined to the winding fireproof covering material. an additional refractory coating;
A composite fire resistant cladding structure comprising:

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