Fire resistive covering structure

Abstract

To provide a fire resistive covering structure that can more reliably support an inner fire resistive covering part.SOLUTION: A fire resistive covering structure 10 includes H-shaped steel 12 with an opening 16 in a web 15 connecting a pair of flanges 13, 14, an inner fire resistive covering part 50 disposed between the pair of flanges 13, 14 and covering the H-shaped steel 12 from the inside in the long 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 resistive covering part 50. The inner support part 60 supports the inner fire resistive covering part 50 with vertical members 61 extending in the long direction of the H-shaped steel 12 and horizontal members 62 extending in the extension direction of the H-shaped steel 12. The vertical members 61 are positioned at positions sandwiching the inner fire resistive covering part 50 in the extension direction of the H-shaped steel 12. The horizontal members 62 are positioned at positions sandwiching the inner fire resistive covering part 50 in the long direction of the H-shaped steel 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant covering structure applied to an H-beam having openings formed in the web. [Background technology]

[0002] Patent Document 1 discloses a fire-resistant covering structure for an H-beam having a pair of flanges and a web connecting the pair of flanges. In Patent Document 1, the fire-resistant covering that covers the H-beam from the outside is supported on each end of the flange using various steel materials. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-84597 Summary of the Invention [Problem to be solved by the invention]

[0004] In H-beams used for beams and the like, openings are sometimes formed in the webs for passing various pipes and the like. In such a fire-resistant covering structure, the fire-resistant covering that covers the H-beam from the outside also has through holes for passing pipes and the like, so an inner fire-resistant covering that covers the H-beam from the inside is required. Furthermore, the H-beam is required to have an inner support that can more reliably support the inner fire-resistant covering, for example, to prevent it from shifting position during various work operations or falling off in the event of a fire. [Means for solving the problem]

[0005] A fire-resistant covering structure that solves the above problem includes an H-shaped steel beam 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, and an inner support portion fixed to the H-shaped steel beam and supporting the inner fire-resistant covering portion. The inner support portion supports the inner fire-resistant covering portion with vertical members extending in the direction of the H-shaped steel beam and horizontal members extending in the extension direction of the H-shaped steel beam, the vertical members being positioned to sandwich the inner fire-resistant covering portion in the extension direction of the H-shaped steel beam, and the horizontal members being positioned to sandwich the inner fire-resistant covering portion in the direction of the H-shaped steel beam. [Effects of the Invention]

[0006] According to the present invention, the inner fire-resistant covering portion can be supported more reliably. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic configuration of a fire-resistant covering structure in a first embodiment. [Figure 2] FIG. 2 is a side view showing an inner support part as seen from the outer side in the width direction of the H-beam in the first embodiment. [Figure 3] FIG. 10 is a cross-sectional view showing a schematic configuration of a fire-resistant covering structure in a second embodiment. [Figure 4] FIG. 11 is a side view showing an inner support part as seen from the outer side in the width direction of the H-beam in the second embodiment. [Figure 5] FIG. 10 is a side view showing the inner covering portion and the inner supporting portion as viewed from the outside in the width direction of the H-shaped steel in a modified example of the first embodiment. [Figure 6] FIG. 10 is a side view showing the inner covering portion and the inner supporting portion as viewed from the outside in the width direction of the H-shaped steel in a modified example of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] (First embodiment) A first embodiment of a fire-resistant covering structure will be described with reference to FIGS. As shown in Fig. 1, the fire-resistant covering structure 10 is applied to an H-beam 12 installed as a beam supporting a floor slab 11. The H-beam 12 has an upper flange 13, a lower flange 14, and a web 15. The web 15 has openings 16 formed therein for passing various pipes and the like. Note that, hereinafter, the left-right direction in Fig. 1 will be referred to as the width direction, the up-down direction as the height direction (the height direction of the H-beam), and the direction perpendicular to the plane of the paper in Fig. 1 as the extension direction.

[0009] 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 an 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.

[0010] The covering portions 20, 30 have fire-resistant materials 21, 31 and wooden materials 22, 32. The fire-resistant materials 21, 31 are composed of, for example, one sheet of gypsum board or multiple stacked sheets of gypsum board. The fire-resistant 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 fire-resistant material 31 is provided so as to face the lower flange 14 from the outside in the height direction, separated by a space.

[0011] The wooden pieces 22, 32 are made of, for example, CLT (Cross Laminated Timber). The wooden piece 22 is arranged so as to abut against the fire-resistant material 21 from the outside in the width direction. The wooden piece 32 is arranged so as to abut against the fire-resistant material 31 from the outside in the height direction. The wooden piece 32 is joined to the lower end of the wooden piece 22 with a joining material 33 so that the wooden piece 22 is on the leading 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 piece 22 and then driven into the wooden piece 32 so as to penetrate the wooden piece 22. After the wooden pieces 22 and 32 are joined, a filler wood 35 is placed in the joining edge 34 so as to cover the joining material 33.

[0012] The inner fire-resistant covering portion 50 covers the H-beam 12 from the inside, including the opening 16. The inner fire-resistant covering portion 50 is formed of a fire-resistant material, such as gypsum or calcium silicate. In the first embodiment, the inner fire-resistant covering portion 50 is a cylindrical fire-resistant material extending in the width direction between the pair of width-side covering portions 20 (see FIG. 2). The inner fire-resistant covering portion 50 is inserted into the opening 16 and is provided so that each end abuts against the fire-resistant material 21.

[0013] (inner support part) The inner support parts 60 are fixed to the H-shaped steel 12. The inner support parts 60 support the inner fire-resistant covering parts 50. The inner support parts 60 are provided between the upper flange 13 and the lower flange 14 on both sides of the web 15 in the width direction.

[0014] Furthermore, the width side covering portion 20 is joined to the inner support portion 60 by means of 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 portion 60 so as to penetrate the width side covering portion 20. After joining the width side covering portion 20, a filler wood 48 is placed in the joining edge 47 so as to cover and conceal the joining material 46.

[0015] 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 formation 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 in the extension direction of the H-shaped steel 12 between the upper flange 13 and the lower flange 14. The vertical members 61 are arranged 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.

[0016] 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 portions 20 are joined to the horizontal members 62 by connecting members 46. The horizontal members 62 are arranged to abut against the inner fire-resistant covering portions 50, thereby sandwiching the inner fire-resistant covering portions 50 in the extension direction of the H-shaped steel 12. The horizontal members 62 are made of angle members, square steel pipes, channel members, etc.

[0017] The horizontal members 62 are connected to the vertical members 61 via connecting members 65. The connecting members 65 are disposed at the corners formed by the vertical members 61 and the horizontal members 62. The connecting members 65 are formed, for example, by angle members. The connecting members 65 are preferably connected to the vertical members 61 and the horizontal members 62 by fastening members (not shown).

[0018] (Fire-resistant covering construction method) In the fire-resistant covering structure 10 configured as described 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 through 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.

[0019] 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. With this configuration, the inner fire-resistant covering part 50 is sandwiched between the inner support parts 60 in both the height direction and the extension direction of the H-shaped steel 12. As a result, the inner fire-resistant covering part 50 can be supported more reliably.

[0020] (1-2) The fire-resistant covering structure 10 includes width-side covering portions 20 that cover the H-shaped steel 12 from the outside in the width direction of the H-shaped steel 12. The width-side covering portions 20 are joined to the cross members 62 by joining members 46. With this configuration, the cross members 62 can be used as support members that support the width-side covering portions 20.

[0021] (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, parts that are different from the first embodiment will be described in detail, and parts that are the same as those in the first embodiment will be denoted by the same reference numerals and will not be described in detail again.

[0022] (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-inside 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.

[0023] The first plate-type fire-resistant material 71 is a fire-resistant material whose thickness direction is 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 fire-resistant material 72 is a fire-resistant material whose thickness direction is the extension direction of the H-shaped steel 12 and is joined to the horizontal member 82 by a joining material 85.

[0024] The rectangular plate-shaped annular refractory material 73 has an opening 75 in the center that is smaller than the opening 16, and is sandwiched between the plate-shaped refractory materials 71, 72 and the web 15 in the width direction. The rectangular plate-shaped annular refractory material 73 is attached to the web 15 by being attached from the outside in the width direction. The opening-inside annular refractory material 74 is a refractory material disposed inside the opening 16. The opening-inside annular refractory material 74 is sandwiched between the rectangular plate-shaped annular refractory materials 73. For example, the opening-inside annular refractory material 74 is a refractory material filled between a pair of rectangular plate-shaped annular refractory materials 73. Alternatively, the opening-inside annular refractory material 74 is a refractory material attached to the inner circumferential surface of the opening 16.

[0025] (Inner support part) As shown in Fig. 4, in the inner support part 80, each end of the vertical member 81 in the extension direction of the H-shaped steel 12 is connected to a horizontal member 82. The horizontal member 82 is fixed to the web 15 on the outside 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.

[0026] (Fire-resistant covering construction method) In the fire-resistant covering structure 10 configured as described above, a pair of rectangular plate-shaped 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-shaped annular fire-resistant materials 73. An inner support part 80 is also installed. Then, the first plate-shaped fire-resistant material 71 is joined to the vertical member 81, and the second plate-shaped fire-resistant material 72 is joined to the horizontal member 82.

[0027] 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 fire-resistant covering part 70 includes a first plate-type fire-resistant material 71 whose thickness direction is the extension direction of the H-shaped steel 12 and a second plate-type fire-resistant material 72 whose thickness direction is the formation direction of the H-shaped steel 12. The inner support part 80 supports the inner fire-resistant covering part 70 by joining the first plate-type fire-resistant material 71 to the vertical member 81 and joining the second plate-type fire-resistant 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 fire-resistant covering part 70. Furthermore, the plate-type fire-resistant materials 71, 72 can be more firmly supported by the inner support part 80.

[0028] The first and second embodiments can be modified as follows: The first and second embodiments and the following modifications can be combined and implemented within the scope of technical compatibility.

[0029] The inner support portion 80 is only required 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.

[0030] The vertical members 61 may be disposed outside the horizontal members 62 in the width direction. The horizontal members 62 may be disposed outside the vertical members 61 in the width direction. The fire-resistant covering 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.

[0031] As shown in Fig. 5, when the H-shaped steel 12 has a plurality of openings 16 aligned in the extension direction, the inner support part 60 of the first embodiment may be configured to support a plurality of inner fire-resistant covering parts 50 with a pair of horizontal members 62 connected at both ends to vertical members 61. With this configuration, the inner support part 60 can efficiently support a plurality of inner fire-resistant covering parts 50 from the viewpoint of ease of installation. The inner covering parts 50 are fixed in the left-right direction in Fig. 5 with, for example, screws.

[0032] As shown in FIG. 6 , when a plurality of openings 16 are formed in the H-shaped steel 12, the inner fire-resistant covering portion 70 of the second embodiment may have rectangular plate-shaped annular fire-resistant materials 73 having openings 75 corresponding to each of the openings 16, and inner-opening annular fire-resistant materials 74 corresponding to each of the openings 16. [Explanation of symbols]

[0033] 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 portion, 21...fire-resistant material, 22...wooden material, 23...through hole, 30...flange side covering portion, 31...fire-resistant material, 32...wooden material, 33...joint material, 34...joint edge, 35...filler wood, 46...joint material, 47...joint Edge, 48... Embedded wood, 50... Inner fireproof covering part, 60... Inner support part, 61... Vertical member, 62... Horizontal member, 65... Connecting member, 70... Inner fireproof covering part, 71... First plate type fireproofing material, 72... 2nd plate type refractory material, 73... rectangular plate type annular refractory material, 74... annular refractory material inside the opening, 75... opening, 80... inner support part, 81... vertical member, 82... horizontal member, 85... joining material, 86... fixing material.

Claims

1. 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 portion fixed to the H-shaped steel and supporting the inner fire-resistant covering portion, The inner support portion supports the inner fire-resistant covering portion with vertical members extending in the direction of the H-shaped steel and horizontal members 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 horizontal members are provided at positions that sandwich the inner fire-resistant covering portion in the direction of the H-shaped steel. Fire-resistant coated structure.

2. 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 inner support portion supports the cylindrical refractory material by the vertical members and the horizontal members being in contact with the cylindrical refractory material. The fire-resistant coated structure of claim 1.

3. 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 inner support portion supports the cylindrical refractory materials by the cross member abutting against the plurality of cylindrical refractory materials. The fire-resistant coated structure of claim 1.

4. The inner fire-resistant covering portion includes a first plate-type fire-resistant material whose thickness direction is the extension direction of the H-shaped steel and a second plate-type fire-resistant material whose thickness direction is the forming direction of the H-shaped steel, The inner support portion supports the inner fire-resistant covering portion by joining the first plate-type fire-resistant material to the vertical member and joining the second plate-type fire-resistant material to the horizontal member. The fire-resistant coated structure of claim 1.

5. A width-side fire-resistant covering portion is provided to cover the H-shaped steel from the outside in the width direction of the H-shaped steel, The width-side fire-resistant covering portion is joined to at least one of the vertical members and the horizontal members. The fire-resistant coated structure according to any one of claims 1 to 4.

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