JP7501810B1 - Fire-resistant coating structure - Google Patents

Abstract

[Problem] To provide a fire-resistant covering structure capable of supporting an inner fire-resistant covering part more reliably. [Solution] A fire-resistant covering structure 10 includes an H-shaped steel 12 having an opening 16 in a web 15 connecting a pair of flanges 13, 14, an inner fire-resistant covering part 50 disposed between the pair of flanges 13, 14 and covering the H-shaped steel 12 from the inside in the forming direction of the H-shaped steel 12, and an inner support part 60 fixed to the H-shaped steel 12 and supporting the inner fire-resistant covering part 50. The inner support part 60 supports the inner fire-resistant covering part 50 with a vertical member 61 extending in the forming direction of the H-shaped steel 12 and a horizontal member 62 extending in the extending direction of the H-shaped steel 12. The vertical member 61 is provided at a position that sandwiches the inner fire-resistant covering part 50 in the extending direction of the H-shaped steel 12. The horizontal member 62 is provided at a position that sandwiches the inner fire-resistant covering part 50 in the forming direction of the H-shaped steel 12. [Selected Figure] FIG.

Description

The present invention relates to a fire-resistant coating structure applied to H-shaped steel with openings formed in the web.

Patent Document 1 discloses a fire-resistant coating structure for an H-shaped steel beam having a pair of flanges and a web connecting the pair of flanges. In Patent Document 1, the fire-resistant coating that covers the H-shaped steel beam from the outside is supported at each end of the flange using various steel materials.

JP 2023-84597 A

In H-shaped steel used for beams, etc., openings are sometimes formed in the webs for passing various pipes and the like. In a fire-resistant covering structure of this configuration, the fire-resistant covering that covers the H-shaped steel from the outside also has through holes for passing pipes and the like, so an inner fire-resistant covering that covers the H-shaped steel from the inside is necessary. And it is required that the H-shaped steel be provided with an inner support part that can more reliably support the inner fire-resistant covering part, for example to prevent it from shifting during various work operations or falling off in the event of a fire.

The fire-resistant covering structure that solves the above problem includes an H-shaped steel with an opening in a web that connects a pair of flanges, an inner fire-resistant covering part that is arranged between the pair of flanges and includes a fire-resistant material that covers the opening, and an inner support part that is fixed to the H-shaped steel and supports the inner fire-resistant covering part. The inner support part supports the inner fire-resistant covering part with vertical members that extend in the forming direction of the H-shaped steel and horizontal members that extend in the extension direction of the H-shaped steel, and the vertical members are positioned to sandwich the inner fire-resistant covering part in the extension direction of the H-shaped steel, and the horizontal members are positioned to sandwich the inner fire-resistant covering part in the forming direction of the H-shaped steel.

The present invention allows the inner fire-resistant coating to be supported more reliably.

FIG. 2 is a cross-sectional view showing a schematic configuration of a fire-resistant covering structure in the first embodiment. FIG. 4 is a side view showing an inner support portion as viewed from the outside in the width direction of the H-shaped steel in the first embodiment. FIG. 11 is a cross-sectional view showing a schematic configuration of a fire-resistant covering structure in a second embodiment. FIG. 11 is a side view showing an inner support portion as viewed from the widthwise outer side of the H-shaped steel in the second embodiment. FIG. 11 is a side view showing the inner covering portion and the inner supporting portion as viewed from the widthwise outer side of the H-shaped steel in a modified example of the first embodiment. FIG. 11 is a side view showing the inner covering portion and the inner supporting portion as viewed from the widthwise outer side of the H-shaped steel in a modified example of the second embodiment.

First Embodiment
A first embodiment of a fire-resistant covering structure will be described with reference to Figs. 1 and 2.
As shown in Fig. 1, the fire-resistant covering structure 10 is applied to an H-shaped steel 12 installed as a beam supporting a floor slab 11. The H-shaped steel 12 has an upper flange 13, a lower flange 14, and a web 15. The web 15 is formed with an opening 16 for passing various pipes and the like. In the following, the left-right direction in Fig. 1 is referred to as the width direction, the up-down direction is referred to as the construction direction (the height direction of the H-shaped steel), and the direction perpendicular to the plane of the paper in Fig. 1 is referred to as the extension direction.

The fire-resistant covering structure 10 includes a width side covering portion 20 , a flange side covering portion 30 , an inner fire-resistant covering portion 50 , and an inner support portion 60 .
The width side covering portion 20 is a width side fire-resistant covering portion that covers the H-shaped steel 12 from the outside in the width direction. The width side covering portion 20 has through holes 23 formed therein for passing various pipes and the like. The flange side covering portion 30 is a fire-resistant covering portion that covers the H-shaped steel 12 from the outside in the construction direction. The width side covering portion 20 is supported by the H-shaped steel 12 via the inner support portion 60. The flange side covering portion 30 is supported by the H-shaped steel 12 via the width side covering portion 20 and the inner support portion 60.

The covering parts 20, 30 have fireproof materials 21, 31 and wood materials 22, 32. The fireproof materials 21, 31 are composed of, for example, one sheet of gypsum board or multiple stacked sheets of gypsum board. The fireproof material 21 is provided so as to cover the upper flange 13 and the lower flange 14 from the outside in the width direction. The fireproof material 31 is provided so as to face the lower flange 14 from the outside in the height direction across a space.

The wooden materials 22 and 32 are made of, for example, CLT (Cross Laminated Timber). The wooden material 22 is provided so as to abut against the fireproof material 21 from the outside in the width direction. The wooden material 32 is provided so as to abut against the fireproof material 31 from the outside in the height direction. The wooden material 32 is joined to the lower end of the wooden material 22 by a joining material 33 so that the wooden material 22 is the winning side. The joining material 33 is, for example, a screw. The joining material 33 is inserted into a joining edge 34 formed in the wooden material 22, and then driven into the wooden material 32 so as to penetrate the wooden material 22. After the wooden material 22 and the wooden material 32 are joined, a filler 35 is placed on the joining edge 34 so as to cover and hide the joining material 33.

The inner fire-resistant coating part 50 covers the H-shaped steel 12 from the inside, including the opening 16. The inner fire-resistant coating part 50 is formed of a fire-resistant material, such as gypsum or calcium silicate. In the first embodiment, the inner fire-resistant coating part 50 is a cylindrical fire-resistant material that extends in the width direction between a pair of width side coating parts 20 (see Figure 2). The inner fire-resistant coating part 50 is inserted through the opening 16 and is arranged so that each end abuts the fire-resistant material 21.

(Inner support part)
The inner support portion 60 is fixed to the H-shaped steel 12. The inner support portion 60 supports the inner fire-resistant covering portion 50. The inner support portion 60 is provided between the upper flange 13 and the lower flange 14 on both sides of the web 15 in the width direction.

The width side covering part 20 is joined to the inner support part 60 by a joining material 46. The joining material 46 is, for example, a screw. The joining material 46 is inserted into a joining edge 47 formed in the wood material 22, and then joined to the inner support part 60 so as to penetrate the width side covering part 20. After joining the width side covering part 20, a filler wood 48 is placed on the joining edge 47 so as to cover and hide the joining material 46.

As shown in FIG. 2 , the inner support portion 60 has a pair of vertical members 61 that sandwich the H-shaped steel 12 in the extension direction and a pair of horizontal members 62 that sandwich the H-shaped steel 12 in the forming direction.
The vertical members 61 are steel members fixed to the upper flange 13 and the lower flange 14 by welding or the like and extending between the upper flange 13 and the lower flange 14 in the extension direction of the H-shaped steel 12. The vertical members 61 are provided so as to abut against the inner fire-resistant covering portion 50 and thereby sandwich the inner fire-resistant covering portion 50 in the extension direction of the H-shaped steel 12. The vertical members 61 are made of angle members, square steel pipes, channel members, etc.

The horizontal members 62 are steel members that are connected to each vertical member 61 and extend between the two vertical members 61 in the extension direction of the H-shaped steel 12. The width side covering portion 20 is joined to the horizontal members 62 by joining members 46. The horizontal members 62 are arranged to abut against the inner fire-resistant covering portion 50 and thereby sandwich the inner fire-resistant covering portion 50 in the construction direction of the H-shaped steel 12. The horizontal members 62 are made of angle members, square steel pipes, channel members, etc.

The horizontal member 62 is connected to the vertical member 61 via a connecting member 65. The connecting member 65 is disposed at the corner between the vertical member 61 and the horizontal member 62. The connecting member 65 is, for example, an angle member. It is preferable that the connecting member 65 is connected to each of the vertical member 61 and the horizontal member 62 by a fastening member (not shown).

(Fire-resistant covering construction method)
In the fire-resistant covering structure 10 configured as above, two vertical members 61 are connected to the H-shaped steel 12 so as to sandwich the inner fire-resistant covering part 50 inserted into the opening 16 in the extension direction of the H-shaped steel 12. Then, two horizontal members 62 are connected to the vertical members 61 via connecting members 65 so as to sandwich the inner fire-resistant covering part 50 in the extension direction of the H-shaped steel 12. In this way, the inner fire-resistant covering part 50 is supported by the inner support part 60.

The operation and effects of the first embodiment will be described.
(1-1) The inner fire-resistant covering part 50 is composed of a cylindrical fire-resistant material that extends in the width direction of the H-shaped steel 12 and is inserted into the opening 16. The inner support part 60 supports the inner fire-resistant covering part 50 by the vertical members 61 and the horizontal members 62 abutting against the inner fire-resistant covering part 50. According to this configuration, the inner fire-resistant covering part 50 is clamped by the inner support parts 60 in both the forming direction and the extending direction of the H-shaped steel 12. As a result, the inner fire-resistant covering part 50 can be supported more reliably.

(1-2) The fire-resistant covering structure 10 has a width side covering portion 20 that covers the H-shaped steel 12 from the outside in the width direction of the H-shaped steel 12. The width side covering portion 20 is joined to the cross member 62 by a joining material 46. With this configuration, the cross member 62 can be used as a support material that supports the width side covering portion 20.

Second Embodiment
A second embodiment of the fire-resistant covering structure will be described with reference to Figures 3 and 4. In the second embodiment, the parts different from the first embodiment will be described in detail, and the parts similar to those in the first embodiment will be denoted by the same reference numerals and their detailed description will be omitted.

(Inner fireproof coating)
As shown in Fig. 3, the inner fire-resistant covering portion 70 is composed of various fire-resistant materials that cover the H-shaped steel 12 from the inside. Specifically, the inner fire-resistant covering portion 70 is composed of a first plate-type fire-resistant material 71, a second plate-type fire-resistant material 72, a rectangular plate-type annular fire-resistant material 73, and an opening inner annular fire-resistant material 74. The first plate-type fire-resistant material 71, the second plate-type fire-resistant material 72, and the rectangular plate-type annular fire-resistant material 73 are provided on both sides of the web 15 in the width direction.

The first plate-type fireproof material 71 is a fireproof material whose thickness direction is the same as the extension direction of the H-shaped steel 12, and is joined to the vertical member 81 by a joining material (not shown). The second plate-type fireproof material 72 is a fireproof material whose thickness direction is the same as the formation direction of the H-shaped steel 12, and is joined to the horizontal member 82 by a joining material 85.

The rectangular plate-type annular fire-resistant material 73 is a fire-resistant material that has an opening 75 in the center that is smaller than the opening 16 and is sandwiched between the plate-type fire-resistant materials 71, 72 and the web 15 in the width direction. The rectangular plate-type annular fire-resistant material 73 is attached to the web 15 by pasting from the outside in the width direction. The opening-inside annular fire-resistant material 74 is a fire-resistant material that is disposed inside the opening 16. The opening-inside annular fire-resistant material 74 is sandwiched between the rectangular plate-type annular fire-resistant materials 73. For example, the opening-inside annular fire-resistant material 74 is a fire-resistant material that is filled between a pair of rectangular plate-type annular fire-resistant materials 73. Also, for example, the opening-inside annular fire-resistant material 74 is a fire-resistant material that is pasted on the inner peripheral surface of the opening 16.

(Inner support part)
As shown in Fig. 4, in the inner support part 80, each end of the vertical member 81 in the direction in which the H-shaped steel 12 is formed is connected to a horizontal member 82. The horizontal member 82 is fixed to the web 15 on the outer side of the vertical member 81 in the extension direction of the H-shaped steel 12 via a fixing member 86 made of an angle member or the like.

(Fire-resistant covering construction method)
In the fire-resistant covering structure 10 configured as above, a pair of rectangular plate-type annular fire-resistant materials 73 are attached to the web 15 by being attached from the outside in the width direction, and an opening-inside annular fire-resistant material 74 is provided between the pair of rectangular plate-type annular fire-resistant materials 73. Also, an inner support part 80 is installed. Then, the first plate-type fire-resistant material 71 is joined to the vertical member 81, and the second plate-type fire-resistant material 72 is joined to the horizontal member 82.

According to the fire-resistant covering structure of the second embodiment, in addition to the actions and effects described in (1-2) of the first embodiment, the following actions and effects can be obtained.
(2-1) The inner fireproof covering part 70 includes a first plate-type fireproof material 71 whose thickness direction is the extension direction of the H-shaped steel 12 and a second plate-type fireproof material 72 whose thickness direction is the forming direction of the H-shaped steel 12. The inner support part 80 supports the inner fireproof covering part 70 by joining the first plate-type fireproof material 71 to the vertical member 81 and joining the second plate-type fireproof material 72 to the horizontal member 82. With this configuration, even if the opening 16 formed in the web 15 is small, the inner support part 80 can support the inner fireproof covering part 70. In addition, the plate-type fireproof materials 71, 72 can be supported by the inner support part 80 more firmly.

The first and second embodiments can be modified as follows. The first and second embodiments and the following modified examples can be combined with each other to the extent that there is no technical contradiction.

The inner support portion 80 only needs to be fixed to the H-shaped steel 12 and support the inner fire-resistant covering portion 70. Therefore, both the vertical member 61 and the horizontal member 62 may be fixed to the H-shaped steel 12.
The width side covering portions 20 may be joined to the vertical members 61. The width side covering portions 20 may be joined to both the vertical members 61 and the horizontal members 62.

The vertical members 61 may be disposed outside the horizontal members 62 in the width direction.
The horizontal members 62 may be disposed on the outer sides of the vertical members 61 in the width direction.
The fire-resistant coating structure is not limited to the H-shaped steel 12 installed as a beam, but may also be applied to the H-shaped steel 12 installed as a column.

- As shown in FIG. 5, when the H-shaped steel 12 has multiple openings 16 aligned in the extension direction, the inner support part 60 of the first embodiment may be configured to support multiple inner fire-resistant coating parts 50 with a pair of horizontal members 62 connected at both ends to vertical members 61. With this configuration, the multiple inner fire-resistant coating parts 50 can be efficiently supported from the viewpoint of the workability of the inner support part 60. The inner coating parts 50 are fixed in the left-right direction in FIG. 5, for example, with screws.

- As shown in FIG. 6, when multiple openings 16 are formed in the H-shaped steel 12, the inner fire-resistant coating portion 70 of the second embodiment may have a rectangular plate-shaped annular fire-resistant material 73 having openings 75 corresponding to each opening 16, and an inner-opening annular fire-resistant material 74 corresponding to each opening 16.

10...fire-resistant covering structure, 11...floor slab, 12...H-shaped steel, 13...upper flange, 14...lower flange, 15...web, 16...opening, 20...width side covering part, 21...fire-resistant material, 22...wooden material, 23...through hole, 30...flange side covering part, 31...fire-resistant material, 32...wooden material, 33...jointing material, 34...joint edge, 35...filler wood, 46...jointing material, 47...jointing Edge, 48...filler, 50...inner fireproof coating, 60...inner support, 61...vertical member, 62...horizontal member, 65...connecting member, 70...inner fireproof coating, 71...first plate-type fireproof material, 72...second plate-type fireproof material, 73...rectangular plate-type annular fireproof material, 74...opening inner annular fireproof material, 75...opening, 80...inner support, 81...vertical member, 82...horizontal member, 85...jointing member, 86...fixing member.

Claims (5)

An H-shaped steel having an opening in a web connecting a pair of flanges;
An inner fire-resistant covering portion disposed between the pair of flanges and including a fire-resistant material covering the opening;
An inner support part fixed to the H-shaped steel and supporting the inner fire-resistant covering part,
The inner support portion supports the inner fire-resistant covering portion with a vertical member extending in the forming direction of the H-shaped steel and a horizontal member extending in the extension direction of the H-shaped steel,
The vertical members are provided at positions that sandwich the inner fire-resistant covering portion in the extending direction of the H-shaped steel,
The cross member is provided at a position that sandwiches the inner fire-resistant coating portion in the direction of construction of the H-shaped steel. The inner fire-resistant covering portion is composed of a cylindrical fire-resistant material extending in the width direction of the H-shaped steel and inserted into the opening,
The fire-resistant covering structure according to claim 1 , wherein the inner support portion supports the tubular fire-resistant material by the vertical members and the horizontal members being in contact with the tubular fire-resistant material. The H-shaped steel has a plurality of openings aligned in the extension direction of the H-shaped steel,
The inner fire-resistant covering portion is composed of a cylindrical fire-resistant material extending in the width direction of the H-shaped steel and inserted into each of the plurality of openings,
The fire-resistant covering structure according to claim 1 , wherein the inner support portion supports the cylindrical fire-resistant materials by the cross member abutting against the plurality of cylindrical fire-resistant materials. The inner fire-resistant covering portion includes a first plate-type fire-resistant material whose thickness direction corresponds to the extension direction of the H-shaped steel and a second plate-type fire-resistant material whose thickness direction corresponds to the forming direction of the H-shaped steel,
The fire-resistant covering structure according to claim 1 , wherein the inner support portion supports the inner fire-resistant covering portion by the first plate-type fire-resistant material being joined to the vertical member and the second plate-type fire-resistant material being joined to the horizontal member. A width side fire-resistant covering portion is provided to cover the H-shaped steel from the outer side in the width direction of the H-shaped steel,
The fire-resistant covering structure according to any one of claims 1 to 4, wherein the width-side fire-resistant covering portion is joined to at least one of the vertical members and the horizontal members.

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