JP7485245B1 - Fire-resistant coating structure - Google Patents

Abstract

A fire-resistant covering structure capable of supporting a fire-resistant covering portion while effectively absorbing manufacturing errors occurring in H-shaped steel is provided.
[Solution] The fire-resistant covering structure comprises an H-shaped steel having a pair of flanges and a web connecting the pair of flanges, an outer support part 50 supported by the H-shaped steel and disposed outside the pair of flanges in the forming direction of the H-shaped steel, a width side covering part 20 joined to the outer support part 50 by a joining material 53 and covering the H-shaped steel from the outside in the width direction, and a flange side covering part 30 joined to the outer support part 50 by a joining material 56 and covering the H-shaped steel from the outside in the forming direction. The outer support part 50 comprises a first outer support part 51 fixed to the flange 14, and a second outer support part 52 connected to the first outer support part 51, having a width side joint part 52a to which the width side covering part 20 is joined and a flange side joint part 52b to which the flange side covering part 30 is joined.
[Selected figure] Figure 3

Description

The present invention relates to a fire-resistant coating structure for H-shaped steel.

Patent Document 1 discloses a fire-resistant coating structure for an H-shaped steel beam that has a pair of flanges and a web that connects the pair of flanges. In Patent Document 1, the fire-resistant coating that covers the H-shaped steel beam is supported by the flanges by bonding.

JP 2013-011063 A

However, in the structure described in Patent Document 1, if there was a manufacturing error in the H-shaped steel, the manufacturing error had to be absorbed by the fire-resistant coating.

The fire-resistant covering structure that solves the above problem includes an H-shaped steel having a pair of flanges and a web connecting the pair of flanges, a width side covering part that covers the H-shaped steel from the outside in the width direction, a flange side covering part that covers the H-shaped steel from the outside in the forming direction, and an outer support part that is supported by the H-shaped steel and to which the width side covering part and the flange side covering part are joined on the outside of the pair of flanges in the forming direction of the H-shaped steel. The outer support part includes a first outer support material that is fixed to the flange, and a second outer support material that has a width side joint part where the width side covering part is joined by a width side joining material and a flange side joint part where the flange side covering part is joined by a flange side joining material and is connected to the first outer support material.

The present invention makes it possible to effectively absorb manufacturing errors in the H-shaped steel while supporting the fire-resistant coating.

FIG. 2 is a cross-sectional view showing a schematic configuration of a fire-resistant covering structure in the first embodiment. FIG. 2 is a diagram showing a schematic configuration of an intermediate support part in the first embodiment, and is an enlarged view of a portion surrounded by a dashed line 2 shown in FIG. 1 . FIG. 2 is a diagram showing a schematic configuration of an outer support part in the first embodiment, and is an enlarged view of a portion surrounded by a dashed line 3 shown in FIG. 1 . FIG. 4 is a diagram showing a preparation process for H-shaped steel in the first embodiment. 6A to 6C are diagrams showing a preparation step for a width side covering portion in the first embodiment. 10A to 10C are diagrams for explaining a width-side covering portion arranging step in the first embodiment. 10A to 10C are diagrams for explaining a flange side covering portion arrangement step in the first embodiment. 10A to 10C are diagrams for explaining a flange side covering portion arrangement step 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. 10 is a diagram showing a schematic configuration of an intermediate support part in the second embodiment, and is an enlarged view of a portion surrounded by a dashed line 4 shown in FIG. 9 . FIG. 10 is a diagram showing a schematic configuration of an outer support part in the second embodiment, and is an enlarged view of a portion surrounded by a dashed line 5 shown in FIG. 9 . FIG. 11 is a diagram showing a preparation process for H-shaped steel in the second embodiment. FIG. 11 is a diagram for explaining a first joining step in the second embodiment. FIG. 11 is a diagram for explaining a second joining step in the second embodiment.

(First embodiment)
A first embodiment of a fire-resistant covering structure will be described with reference to FIGS. 1 to 8. FIG.
As shown in Fig. 1, in the first embodiment, 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. In the following, the left-right direction in Fig. 1 is referred to as the width direction, and the up-down direction is referred to as the forming direction (height direction of the H-shaped steel). Also, the inside and outside of each direction are defined based on the H-shaped steel 12 in Fig. 1.

The fire-resistant covering structure 10 includes a width side covering portion 20 , a flange side covering portion 30 , an intermediate support portion 40 , and an outer support portion 50 .
The width side covering portion 20 is a fire-resistant covering portion that covers the H-shaped steel 12 from the outside in the width direction. The flange side covering portion 30 is a fire-resistant covering portion that covers the H-shaped steel 12 from the outside in the length direction. The covering portions 20, 30 have fire-resistant materials 21, 31 and wood materials 22, 32.

The fireproof material 21 is provided so as to face the H-shaped steel 12 from the outside in the width direction. The fireproof material 21 is supported by the H-shaped steel 12 via the intermediate support part 40 and the outer support part 50. The fireproof material 31 is provided so as to face the lower flange 14 from the outside in the construction direction across a space. The fireproof material 31 is supported by the H-shaped steel 12 via the outer support part 50.

The fireproof materials 21, 31 are composed of, for example, one sheet or multiple laminated sheets of gypsum board. In the first embodiment, the fireproof material 21 is composed of an inner fireproof material 21A and an outer fireproof material 21B, and the fireproof material 31 is composed of an inner fireproof material 31A and an outer fireproof material 31B. The inner fireproof material 21A is arranged so as to be the winning side relative to the inner fireproof material 31A, and the outer fireproof material 21B is arranged so as to be the winning side relative to the outer fireproof material 31B.

The wooden materials 22, 32 are made of, for example, CLT (Cross Laminated Timber). The wooden material 22 is arranged so as to abut against the fireproof material 21 from the outside in the width direction. The wooden material 22 is supported by the H-shaped steel 12 via the intermediate support part 40 and the outer support part 50.

The wooden material 32 is arranged so as to abut against the fireproof material 31 from the outside in the direction of construction. 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 on 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 intermediate support portion 40 is provided between the upper flange 13 and the lower flange 14. The intermediate support portion 40 is provided so that the second joint portion 42b described later is disposed at a different position in the forming direction. In the first embodiment, the intermediate support portion 40 is provided on both sides of the web 15 in the width direction. The outer support portions 50 are provided on the outer side of the H-shaped steel 12 in the forming direction, at each end of the H-shaped steel 12 in the width direction.

(Middle support part)
As shown in Fig. 2, the intermediate support portion 40 has a first intermediate support member 41 and a second intermediate support member 42. The first intermediate support member 41 is a steel material fixed to the H-shaped steel 12. The first intermediate support member 41 has a first fixing portion 41a and a first connecting portion 41b. The first fixing portion 41a is a portion fixed to the H-shaped steel 12 by, for example, welding. The first connecting portion 41b is a portion to which the second intermediate support member 42 is connected.

In the first embodiment, the first intermediate support member 41 is composed of an angle bar arranged so that the extension direction of the H-shaped steel 12 is the material axis direction. The first intermediate support member 41 has a first fixing portion 41a welded to the web 15 so that the first connecting portion 41b extends toward the outside in the width direction.

The second intermediate support member 42 is a steel material that is connected to the first intermediate support member 41 and to which the width side covering portion 20 is joined. The second intermediate support member 42 has a second connecting portion 42a and a second joining portion 42b.

The second connecting portion 42a is a portion that is connected to the first connecting portion 41b of the first intermediate support member 41. The second joint portion 42b is a planar portion that has an abutment surface against which the width side covering portion 20 abuts and to which the width side covering portion 20 is joined. After the position of the second joint portion 42b of the second intermediate support member 42 is adjusted so that the abutment surface is positioned at a desired position, the second connecting portion 42a is connected to the first connecting portion 41b.

In the first embodiment, the second intermediate support member 42 is composed of a square steel pipe arranged so that the extension direction of the H-shaped steel 12 is the material axis direction. The second intermediate support member 42 may be an angle material or a channel material as long as it has a second connecting portion 42a and a second joint portion 42b. The second intermediate support member 42 has the second connecting portion 42a connected to the first connecting portion 41b of the first intermediate support member 41 by a fastening member 45 consisting of a bolt and a nut.

The first connecting portion 41b and the second connecting portion 42a are formed with fastening holes through which the bolts of the fastening members 45 pass. One of the first connecting portion 41b and the second connecting portion 42a is formed with a long hole that is long in the width direction as the fastening hole. This makes it possible to adjust the position of the second intermediate support member 42 relative to the first intermediate support member 41 in the width direction when the fastening member 45 is in a temporary fastening state.

The width side covering part 20 is joined to the second joint part 42b by a joint material 46. The joint material 46 is, for example, a screw. The joint material 46 is an intermediate joint material that joins the width side covering part to the intermediate support part. The joint material 46 is inserted into a joint edge 47 formed in the wood material 22, and then joined to the second joint part 42b 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 joint edge 47 so as to cover and hide the joint material 46.

For each intermediate support portion 40, it is sufficient that multiple second joint portions 42b are arranged so as to be spaced apart in the extension direction of the H-shaped steel 12. Therefore, the first intermediate support member 41 may be a member that is provided locally according to the position of the second joint portion 42b, or may be a through member that extends from one end of the H-shaped steel 12 to the other end. The same applies to the second intermediate support member 42.

(Outer support part)
3 , the outer support portion 50 has a first outer support member 51 and a second outer support member 52. The first outer support member 51 is a steel material that is fixed to the lower flange 14 of the H-shaped steel 12.

The first outer support member 51 has a first fixing portion 51a and a first connecting portion 51b. The first fixing portion 51a is a portion that is fixed to the lower flange 14 of the H-shaped steel 12, for example, by welding. The first connecting portion 51b is a portion to which the second outer support member 52 is connected and to which the width side covering portion 20 is joined.

In the first embodiment, the first outer support member 51 is composed of an angle member arranged so that the extension direction of the H-shaped steel 12 is the material axis direction. The first outer support member 51 has a first fixing portion 51a welded to the lower flange 14 so that the first connecting portion 51b extends from slightly inside the outer end face of the lower flange 14 in the width direction to the outside in the height direction. Specifically, the first outer support member 51 is provided at a position where the width side joint portion 52a of the second outer support member 52 described later can be arranged at the corner formed by the lower flange 14 and the first connecting portion 51b.

The second outer support material 52 is a steel material that is connected to the first outer support material 51 and that joins the width side covering portion 20 and the fireproof material 31 of the flange side covering portion 30. The second outer support material 52 is connected to the first outer support material 51 by a joining material 53 that joins the width side covering portion 20 to the first outer support material 51 and the second outer support material 52. The joining material 53 is a width side joining material that joins the width side covering portion to the outer support portion.

The second outer support member 52 has a width side joint 52a and a flange side joint 52b. The width side joint 52a extends in the width direction outside the first outer support member 51, has an abutment surface against which the width side covering portion 20 abuts, and is a planar portion to which the width side covering portion 20 is joined. The flange side joint 52b extends in the width direction outside the first outer support member 51, has an abutment surface against which the flange side covering portion 30 abuts, and is a planar portion to which the fireproof material 31 of the flange side covering portion 30 is joined. In the first embodiment, the second outer support member 52 is, for example, composed of an angle bar arranged so that the extension direction of the H-shaped steel 12 is the material axis direction.

The width side covering part 20 is joined to the width side joint 52a by a joint material 53. The joint material 53 is, for example, a screw. The joint material 53 is inserted into a joint edge 54 formed in the wood material 22, and then passes through the width side covering part 20 to be joined to the width side joint 52a and the first connecting part 51b of the first outer support material 51. After joining the width side covering part 20, a filler wood 55 is placed on the joint edge 54 so as to cover and hide the joint material 53. The fireproof material 31 is joined to the flange side joint 52b by a joint material 56. The joint material 56 is, for example, a screw and a washer. The joint material 56 is a flange side joint material that joins the flange side covering part to the outer support part.

(Fire-resistant covering construction method)
4 to 7, an example of a method for constructing the fire-resistant covering structure 10 will be described. Here, a case will be described in which an H-shaped steel 12 is covered with a width side covering portion 20 and a flange side covering portion 30 in a factory or the like.

The construction method of the fire-resistant covering structure 10 includes a preparation process, a width side covering portion arrangement process, a flange side covering portion arrangement process, and a joining process.
As shown in Fig. 4, in the preparation process, various operations are performed on the H-shaped steel 12. Note that Fig. 4 shows the H-shaped steel 12 so that the bottom flange 14 is located at the top.

Specifically, the first intermediate support member 41 of the intermediate support section 40 and the first outer support member 51 of the outer support section 50 are welded to a predetermined position. In addition, the second intermediate support member 42 of the intermediate support section 40 is temporarily attached to the first intermediate support member 41 using fastening members 45. After that, the position of the second intermediate support member 42 in the width direction is adjusted. The position adjustment is performed, for example, by pressing a plate-shaped material against the upper flange 13, the lower flange 14, and the second intermediate support member 42 from the outside in the width direction. In addition, the position adjustment is performed, for example, based on the results of measuring the dimensions of the H-shaped steel 12. After the position adjustment, the second intermediate support member 42 is connected to the first intermediate support member 41 by fully tightening the fastening members 45.

As shown in FIG. 5, in the preparation process, a width side covering set is prepared. Specifically, the fireproof material 21 is attached to the wooden material 22 on which the ends 34, 47, and 54 are formed, using screws (not shown) or the like. The second outer support material 52 of the outer support part 50 is attached to the fireproof material 21 and the wooden material 22 in a predetermined position, using screws (not shown) or the like.

As shown in FIG. 6, in the width side covering part placement process, the width side covering part 20 is placed in a position where it can be joined to each support part 40, 50 using the joining materials 46, 53. Specifically, the H-shaped steel 12 is placed with the lower flange 14 facing upward. Then, the width side covering set is brought close from above to hook the second outer support member 52 onto the first outer support member 51 of the outer support part 50, and the position of the width side covering set in the extension direction of the H-shaped steel 12 is adjusted.

As shown in FIG. 7, in the flange side covering portion placement process, first, the fireproof material 31 is joined to the second outer support material 52 of the outer support portion 50. Specifically, the fireproof material 31 is fitted from above between a pair of fireproof materials 21 in the width direction. Then, the fireproof material 31 is joined to the second outer support material 52 of the outer support portion 50 using a joining material 56.

Next, as shown in FIG. 8, in the flange side covering portion arrangement process, the wooden material 32 is arranged. Specifically, the wooden material 32 is arranged so as to be fitted from above between a pair of wooden materials 22 in the width direction.

In the joining process, the width side covering part 20 is joined to the intermediate support part 40 using the joining material 46, and the width side covering part 20 is joined to the outer support part 50 using the joining material 53. In addition, the wooden material 22 and the wooden material 32 are joined using the joining material 33. Then, filler wood 35, 48, 55 is placed on each end 34, 47, 54. The H-shaped steel 12 thus fire-resistant-coated with the width side covering part 20 and the flange side covering part 30 is transported to the installation site and then installed in the desired position.

The operation and effects of the first embodiment will be described.
(1-1) The width side covering portion 20 is supported by the H-shaped steel 12 via an intermediate support portion 40. The intermediate support portion 40 has a first intermediate support member 41 fixed to the H-shaped steel 12, and a second intermediate support member 42 connected to the first intermediate support member 41, having an abutment surface against which the width side covering portion 20 abuts, and to which the width side covering portion 20 is joined by a joining material 46.

This configuration allows for greater freedom in the positioning of the second joint 42b in the construction direction, so that even if the construction direction of the H-shaped steel 12 increases, the support point of the width side covering part 20 can be provided at an appropriate position in the construction direction. In addition, because the second intermediate support member 42 has an abutment surface, the width side covering part 20 can be firmly joined to the intermediate support part 40. As a result, even if a fire breaks out, the width side covering part 20 can be more reliably prevented from falling off.

The second intermediate support member 42 can be connected after adjusting the position of the first intermediate support member 41. This allows the abutment surface with which the width side covering portion 20 abuts to be positioned regardless of the position of the outer ends of the flanges 13, 14 in the width direction. In other words, the second joint portion 42b can be easily positioned at the desired position according to the manufacturing error of the H-shaped steel 12.

(1-2) The second intermediate support member 42 is connected to the first intermediate support member 41 by a fastening member 45. A fastening hole having an oblong shape that is long in the width direction is formed in one of the first intermediate support member 41 and the second intermediate support member 42. This configuration makes it easy to adjust the position of the second intermediate support member 42 relative to the first intermediate support member 41.

(1-3) The first intermediate support member 41 is fixed to the web 15. With this configuration, the width side covering portion 20 can be supported by the web 15 via the intermediate support portion 40.
(1-4) The first intermediate support member 41 is made of an angle bar. This allows one side of the angle bar to be fixed to the web 15, thereby increasing the bonding strength between the web 15 and the first intermediate support member 41. In addition, the area occupied by the first intermediate support member 41 in the space between the pair of flanges 13, 14 can be reduced.

(1-5) The second intermediate support member 42 is made of a square steel pipe. This increases the strength of the second intermediate support member 42 to which the width side covering portion 20 is joined.
(1-6) The fire-resistant covering structure 10 includes an outer support portion 50 that supports the width side covering portion 20 and the flange side covering portion 30. The outer support portion 50 includes a first outer support member 51 that is fixed to the lower flange 14, and a second outer support member 52 that is connected to the first outer support member 51 and has a width side joint portion 52a to which the width side covering portion 20 is joined and a flange side joint portion 52b to which the flange side covering portion 30 is joined. With this configuration, the outer support portion 50 can effectively absorb manufacturing errors occurring in the H-shaped steel 12.

(1-7) The first outer support member 51 and the second outer support member 52 are connected by a joint member 53. This allows the second outer support member 52 to be joined to the width side covering portion 20 before the first outer support member 51 and the second outer support member 52 are connected. Therefore, by arranging the H-shaped steel 12 so that the lower flange 14 is located above, the second outer support member 52 can be hooked onto the first outer support member 51 to support the width side covering portion 20. As a result, the workability of covering the H-shaped steel 12 with the width side covering portion 20 can be improved. In addition, since the width side joint member 52a can be arranged at a position away from the first outer support member 51, manufacturing errors occurring in the H-shaped steel 12 can be absorbed more effectively.

(1-8) The second outer support member 52 of the outer support section 50 is a through member that extends from one end of the H-shaped steel 12 to the other end. This makes it possible to prevent flames from entering the interior even if the joint between the fire-resistant material 21 and the fire-resistant material 31 is lost in the event of a fire.

Second Embodiment
A second embodiment of the fire-resistant covering structure will be described with reference to Figures 9 to 14. 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.

(Fireproof material)
9 , in the fire-resistant material 21, the inner fire-resistant material 21A is provided so that an end portion in the direction of height faces the flanges 13, 14 from the outside in the width direction. In the fire-resistant material 31, the inner fire-resistant material 31A is provided so that an end face thereof abuts against the outer fire-resistant material 21B of the fire-resistant material 21.

(Middle support part)
The intermediate support portion 60 has a first intermediate support member 61 and a second intermediate support member 62 .
The first intermediate support member 61 is a fixed member made of a steel material fixed to each of the upper flange 13 and the lower flange 14 by, for example, welding. The second intermediate support member 62 is composed of an erection member 63 and a covering portion support member 64. The erection member 63 is a steel material erected between the first intermediate support member 61 fixed to the upper flange 13 and the first intermediate support member 61 fixed to the lower flange 14. The erection member 63 is connected to the first intermediate support member 61 by a fastening member 45. A long hole that is long in the width direction is formed on one of the first intermediate support member 61 and the erection member 63 as a fastening hole through which the bolt of the fastening member 45 passes. The erection member 63 is configured to be positionally adjustable in the width direction when the fastening member 45 is in a temporary fastening state. The erection member 63 supports the covering portion support member 64. The covering portion support member 64 is a steel material fixed to the erection member 63 by welding or the like.

As shown in FIG. 10, in the second embodiment, the first intermediate support member 61 is formed of a channel member that opens toward the inside in the construction direction and is arranged so that the width direction of the H-shaped steel 12 is the material axis direction. The bottom surface of the channel member is the first fixing portion 61a, and the side surface of the channel member is the first connecting portion 61b.

The erection material 63 is made of a square steel pipe arranged so that the direction of the H-shaped steel 12 is the material axis direction. In the erection material 63, each end in the erection direction is the second connecting portion 62a. The covering support material 64 is made of a square steel pipe arranged so that the extension direction of the H-shaped steel 12 is the material axis direction. In the covering support material 64, the side portion facing the outside in the width direction is the second joint portion 62b. The covering support material 64 may be a member provided locally, or may be a through member extending from one end of the H-shaped steel 12 to the other end. In FIG. 9, two covering support materials 64 are joined to one erection material 63, but it is also possible to join three or more covering support materials 64 to one erection material 63.

(Outer support part)
As shown in FIG. 11, in the outer support portion 70, the first connecting portion 51b of the first outer support member 51 and the width side joint portion 52a of the second outer support member 52 are joined by welding.

The first outer support member 51 is fixed to the lower flange 14 after its position is adjusted in the width direction. The first outer support member 51 has the first fixing portion 51a welded to the lower flange 14 so that the first connecting portion 51b extends from slightly outside the outer end face of the lower flange 14 in the width direction to the outside in the construction direction. Specifically, the first outer support member 51 is welded to the lower flange 14 after its position is adjusted in the width direction so that the width side joint portion 52a of the second outer support member 52 is disposed outside the inner fireproof material 21A in the construction direction and abuts the outer fireproof material 21B of the width side covering portion 20.

The second outer support member 52 is joined by welding at the width side joint 52a to the first connecting portion 51b of the first outer support member 51. Specifically, the second outer support member 52 is adjusted in position in the construction direction while the width side joint 52a is in contact with the first connecting portion 51b of the first outer support member 51. After the position adjustment, the width side joint 52a of the second outer support member 52 is welded to the first connecting portion 51b of the first outer support member 51. The position adjustment of the outer support members 51, 52 is performed, for example, based on the results of measuring the dimensions of the H-shaped steel 12.

(Fire-resistant covering construction method)
12 to 14, an example of a method for constructing the fire-resistant covering structure 10 will be described. Here, a case will be described in which an H-shaped steel 12 is covered with a width side covering portion 20 and a flange side covering portion 30 in a factory or the like.

The construction method of the fire-resistant covering structure 10 includes a preparation step, a first joining step, and a second joining step.
As shown in Fig. 12, in the preparation process, various operations are performed on the H-shaped steel 12. Note that Fig. 12 shows the H-shaped steel 12 so that the lower flange 14 is located at the top.

Specifically, the first intermediate support member 61 of the intermediate support portion 60 is welded to a predetermined position of each flange 13, 14. The covering portion support member 64 is welded to a predetermined position of the installation member 63 to create the second intermediate support member 62. The second intermediate support member 62 is then temporarily fastened to the pair of first intermediate support members 61 using fastening members 45. Thereafter, the position of the second intermediate support member 62 in the width direction is adjusted so that the width side covering portion 20 can abut against the covering portion support member 64. After the position adjustment, the second intermediate support member 62 is connected to the first intermediate support member 61 by fully tightening the fastening members 45.

After adjusting the position of the first outer support member 51 of the outer support section 70, the first outer support member 51 is welded to the lower flange 14. After adjusting the position of the second outer support member 52, the second outer support member 52 is welded to the first outer support member 51.

Furthermore, in the preparation step, the width side covering portion 20 is prepared. Specifically, the fireproof material 21 is attached to the wood material 22 on which the ends 34, 47, and 54 are formed, using screws (not shown) or the like.
13 , in the first joining step, the fireproof material 31 is joined to the second outer support member 52 of the outer support portion 50. Specifically, the H-shaped steel 12 is arranged with the lower flange 14 facing upward, and then the fireproof material 31 is moved close from above and placed on the flange side joint portion 52b of the second outer support member 52. Then, after the position of the fireproof material 31 is adjusted, the fireproof material 31 is joined to the flange side joint portion 52b by the joint material 56.

As shown in FIG. 14, in the second joining step, the width side covering part 20 is joined to the intermediate support part 60 using the joining material 46, and the width side covering part 20 is joined to the outer support part 50 using the joining material 53. The wooden materials 22 and 32 are joined using the joining material 33. Then, filler wood 35, 48, 55 is placed on each end 34, 47, 54. The H-shaped steel 12 thus fire-resistant-coated with the width side covering part 20 and the flange side covering part 30 is transported to the installation site and then installed in the desired position.

According to the fire-resistant coating structure of the second embodiment, in addition to the actions and effects described in (1-1), (1-2), (1-6), and (1-8) of the first embodiment, the following actions and effects can be obtained.

(2-1) The intermediate support portion 60 has a first intermediate support member 61 fixed to each of the flanges 13, 14, and a second intermediate support member 62 composed of an erection member 63 erected on the first intermediate support member 61 and a covering support member 64 joined to the erection member 63. With this configuration, it is possible to join three or more covering support members 64 to one erection member 63. In other words, the degree of freedom of the second joint portion 62b that can be arranged on the two first intermediate support members 61 is improved, so that the load of the work of fixing the first intermediate support member 61 to the H-shaped steel 12 can be reduced.

(2-2) By adjusting the position of the construction material 63 in the width direction, the positions of the multiple second joints 62b arranged in the height direction can be adjusted simultaneously.
(2-3) In the outer support portion 70, the second outer support member 52 is connected to the first outer support member 51 by welding. Therefore, by arranging the H-shaped steel 12 so that the lower flange 14 is located above, the joining work of the fireproof material 31 can be performed in a state where it is placed on the second outer support member 52. As a result, the workability when joining the fireproof material 31 can be improved.

(2-4) The fireproof material 21 is composed of an inner fireproof material 21A and an outer fireproof material 21B that are laminated in the width direction. The outer support part 70 is provided so as to protrude from the outer end face of the lower flange 14 in the width direction. With this configuration, the positions of the covering parts 20, 30 can be adjusted by the joining position of the first outer support material 51 to the H-shaped steel 12 in the width direction and the joining position of the second outer support material 52 to the first outer support material 51 in the construction direction. As a result, the outer support part 70 can be provided so that the manufacturing error of the H-shaped steel 12 is more reliably absorbed while covering the H-shaped steel 12 with the fireproof material.

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 fire-resistant coating structure may be realized by combining the intermediate support part 40 of the first embodiment with the outer support part 70 of the second embodiment, or by combining the outer support part 50 of the first embodiment with the intermediate support part 60 of the second embodiment.

- In the second embodiment of the intermediate support section 60, the erection material 63 may be fixed to the fixing material by welding or the like to form the first intermediate support material, and the covering section support material 64 connected to the erection material 63 by the fastening member 45 may be formed as the second intermediate support material.

- In the above embodiment, the floor slab 11 covers the upper flange 13 of the H-shaped steel 12 from the outside in the construction direction. This is not limited to the above, and the flange side covering portion 30 may be provided so as to cover the upper flange 13 of the H-shaped steel 12 from the outside in the construction direction. In addition, the flange side covering portion 30 may be formed by joining the fireproof material 31 and the wood material 32 to the flange side joint portion 52b with the joining material 56.

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.
The intermediate support portion only needs to have a second joint portion 42b at a position away from the flanges 13, 14, which has a contact surface against which the width side covering portion 20 contacts and to which the width side covering portion 20 is joined by the joining material 46. Therefore, the intermediate support portion may be formed of, for example, a square steel pipe or a channel material joined to the web 15 with the extension direction of the H-shaped steel 12 as the material axis direction.

The outer support portion may be configured such that the width side covering portion 20 and the flange side covering portion 30 are joined to the second outer support material on the outside of the pair of flanges 13, 14 in the forming direction of the H-shaped steel 12. Therefore, the outer support portion may be configured such that the first fixing portion 51a of the first outer support material 51 is fixed to the lower flange 14 on the inside of the pair of flanges 13, 14 in the forming direction of the H-shaped steel 12, for example.

The technical ideas that can be understood from the above-described embodiment and modified examples will be described.
(Appendix 1)
In the fire-resistant coated structure, the first intermediate support member is made of an angle bar, and the second intermediate support member is made of a square steel pipe.

(Appendix 2)
In the fire-resistant covering structure, the first outer support member and the second outer support member are connected by welding.

(Appendix 3)
In the fire-resistant coating structure, the second outer support member is a through member extending from one end to the other end of the H-shaped steel in the extension direction of the H-shaped steel.

10...fire-resistant covering structure, 11...floor slab, 12...H-shaped steel, 13...upper flange, 14...lower flange, 15...web, 20...width side covering portion, 21...fire-resistant material, 21A...inner fire-resistant material, 21B...outer fire-resistant material, 22...wooden material, 30...flange side covering portion, 31...fire-resistant material, 31A...inner fire-resistant material, 31B...outer fire-resistant material, 32...wooden material, 33...joint material, 34...joint edge, 35...filler wood, 40...intermediate support portion, 41...first intermediate support material, 41a...first fixing portion, 41b...first connecting portion, 42...second intermediate support material, 42a...second connecting portion, 42b...second connecting portion , 45...fastening member, 46...jointing material, 47...joint edge, 48...filling wood, 50...outer support part, 51...first outer support part, 51a...first fixing part, 51b...first connecting part, 52...second outer support part, 52a...width side joint part, 52b...flange side joint part, 53...jointing material, 54...joint edge, 55...filling wood, 56...jointing material, 60...intermediate support part, 61...first intermediate support part, 61a...first fixing part, 61b...first connecting part, 62...second intermediate support part, 62a...second connecting part, 62b...second connecting part, 63...construction material, 64...covering part support material, 70...outer support part.

Claims (3)

An H-shaped steel having a pair of flanges and a web connecting the pair of flanges;
A width side covering portion that covers the H-shaped steel from the outside in the width direction;
A flange side covering portion that covers the H-shaped steel from the outside in the forming direction;
an outer support portion supported by the H-shaped steel and to which the width side covering portion and the flange side covering portion are joined on the outer sides of the pair of flanges in the forming direction of the H-shaped steel;
The outer support portion is
a first outer support secured to the flange;
a second outer support material connected to the first outer support material, the second outer support material having a width side joint portion where the width side covering portion is joined by a width side joining material and a flange side joint portion where the flange side covering portion is joined by a flange side joining material. The fire-resistant covered structure of claim 1 , wherein the second outer support is connected to the first outer support by the width side connectors. The width side covering portion includes an inner fireproofing material and an outer fireproofing material laminated in the width direction of the H-shaped steel,
The fire-resistant covering structure according to claim 1 or 2, wherein the width-side joints are disposed outside the inner fire-resistant material in the direction of construction of the H-shaped steel, and the outer fire-resistant material is joined by the width-side joints.

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