Fire-resistive covering structure

Abstract

To provide a fire-resistive covering structure that can more securely restrain falling of a covering part that covers the lateral outside of a H-shaped steel.SOLUTION: A fire-resistive covering structure 10 comprises: a H-shaped steel 12 having a pair of flanges 13, 14 and a web 15 connecting the pair of flanges 13, 14; an intermediate support part 40 that is retained with the H-shaped steel 12 and arranged between the pair of flanges 13, 14; and a lateral-side covering part 20 that is fixed to the intermediate support part 40 with a fixer material 46 to cover the lateral outside of the H-shaped steel 12. The intermediate support part 40 comprises: a first intermediate support material that is fixed to the H-shaped steel 12; and a second intermediate support material that is connected to the first intermediate support material, and has a contact face with which the lateral-side covering part 20 is in contact, and to which the lateral-side covering part 20 is connected with a fixer material 46.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a fire-resistant coating structure for H-shaped steel.

Background Art

[0002] Patent Document 1 discloses a fire-resistant coating structure for H-shaped steel having a pair of flanges and a web connecting the pair of flanges. In Patent Document 1, a fire-resistant coating portion covering the H-shaped steel is supported at each end of the flange using various steel materials.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the structure described in Patent Document 1, the support points of the fire-resistant coating portion covering the H-shaped steel from the outside in the width direction are limited to the vicinity of the flange. Therefore, when the size of the H-shaped steel increases, the fire-resistant coating portion is likely to fall off during a fire or the like.

Means for Solving the Problems

[0005] The fire-resistant coating structure for solving the above problems includes an H-shaped steel having a pair of flanges and a web connecting the pair of flanges, an intermediate support portion supported by the H-shaped steel and disposed between the pair of flanges, and a fire-resistant coating portion joined to the intermediate support portion by a joining material and covering the H-shaped steel from the outside in the width direction. The intermediate support portion has a contact surface with which the fire-resistant coating portion contacts at a position away from the pair of flanges, and a joining portion to which the fire-resistant coating portion is joined by the joining material.

Effects of the Invention

[0006] According to the present invention, it is possible to more reliably suppress the peeling off of the covering portion that covers the H-shaped steel from the outer side in the width direction.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

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Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Mode for Carrying Out the Invention

[0008] (First Embodiment) With reference to FIGS. 1 to 8, a first embodiment of a fire-resistant coating structure will be described. As shown in FIG. 1, in the first embodiment, the fire-resistant coating structure 10 is applied to the H-shaped steel 12 installed as a beam supporting the floor slab 11. The H-shaped steel 12 has an upper flange 13, a lower flange 14, and a web 15. Hereinafter, the left-right direction in FIG. 1 is referred to as the width direction, and the up-down direction is referred to as the height direction (the height direction of the H-shaped steel). Also, the inner and outer sides in each direction are defined based on the H-shaped steel 12 in FIG. 1.

[0009] The fire-resistant coating structure 10 includes a width-side coating portion 20, a flange-side coating portion 30, an intermediate support portion 40, and an outer support portion 50. The width-side coating portion 20 is a fire-resistant coating portion that coats the H-shaped steel 12 from the outer side in the width direction. The flange-side coating portion 30 is a fire-resistant coating portion that coats the H-shaped steel 12 from the outer side in the height direction. The coating portions 20 and 30 have refractory materials 21 and 31 and wooden materials 22 and 32.

[0010] The refractory material 21 is provided so as to face the H-shaped steel 12 from the outer side in the width direction. The refractory material 21 is supported by the H-shaped steel 12 via the intermediate support portion 40 and the outer support portion 50. The refractory material 31 is provided so as to face the lower flange 14 from the outer side in the height direction with a space therebetween. The refractory material 31 is supported by the H-shaped steel 12 via the outer support portion 50.

[0011] The refractory materials 21 and 31 are composed of, for example, one or a plurality of laminated gypsum boards. In the first embodiment, the refractory material 21 is composed of an inner refractory material 21A and an outer refractory material 21B, and the refractory material 31 is composed of an inner refractory material 31A and an outer refractory material 31B. The inner refractory material 21A is provided so as to be on the winning side with respect to the inner refractory material 31A, and the outer refractory material 21B is provided so as to be on the winning side with respect to the outer refractory material 31B.

[0012] The wood materials 22 and 32 are composed of, for example, CLT (Cross Laminated Timber). The wood material 22 is provided so as to abut against the refractory material 21 from the outside in the width direction. The wood material 22 is supported by the H-shaped steel 12 via the intermediate support portion 40 and the outer support portion 50.

[0013] The wood material 32 is provided so as to abut against the refractory material 31 from the outside in the longitudinal direction. The wood material 32 is joined to the lower end portion of the wood material 22 by a joining material 33 so that the wood material 22 is on the winning side. The joining material 33 is, for example, a screw. After the joining material 33 is inserted into the joining edge 34 formed in the wood material 22, it is driven into the wood material 32 so as to penetrate the wood material 22. After the joining of the wood material 22 and the wood material 32, a plug 35 is disposed in the joining edge 34 so as to cover the joining material 33.

[0014] 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 arranged at different positions in the longitudinal 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 portion 50 is provided at each end of the H-shaped steel 12 in the width direction on the outside of the H-shaped steel 12 in the longitudinal direction.

[0015] (Intermediate support portion) As shown in FIG. 2, the intermediate support portion 40 includes 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.

[0016] In the first embodiment, the first intermediate support member 41 is constituted by an angle member disposed such that the extending direction of the H-shaped steel 12 is the material axis direction. The first fixing portion 41a of the first intermediate support member 41 is welded to the web 15 such that the first connecting portion 41b extends outward in the width direction.

[0017] The second intermediate support member 42 is a steel material 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.

[0018] The second connecting portion 42a is a portion connected to the first connecting portion 41b of the first intermediate support member 41. The second joining portion 42b has a contact 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. After the position of the second joining portion 42b is adjusted so that the contact surface is disposed at a desired position, the second connecting portion 42a is connected to the first connecting portion 41b of the first intermediate support member 41.

[0019] In the first embodiment, the second intermediate support member 42 is constituted by an angle steel pipe disposed such that the extending direction of the H-shaped steel 12 is the material axis direction. The second intermediate support member 42 only needs to have a second connecting portion 42a and a second joining portion 42b, and may be an angle member or a channel member. The second connecting portion 42a of the second intermediate support member 42 is connected to the first connecting portion 41b of the first intermediate support member 41 by a fastening member 45 composed of a bolt and a nut.

[0020] The first connecting portion 41b and the second connecting portion 42a are formed with fastening holes through which the bolts of the fastening member 45 pass. One of the first connecting portion 41b and the second connecting portion 42a is formed with an oblong hole that is long in the width direction as the fastening hole. Thereby, when the fastening member 45 is in a temporarily fixed state, the position of the second intermediate support member 42 with respect to the first intermediate support member 41 can be adjusted in the width direction.

[0021] The width-side covering portion 20 is joined to the second joining portion 42b by a joining material 46. The joining material 46 is, for example, a screw. The joining material 46 is an intermediate joining material that joins the width-side covering portion to the intermediate support portion. After being inserted into a joining groove 47 formed in the woody material 22, the joining material 46 is joined to the second joining portion 42b so as to penetrate the width-side covering portion 20. After the width-side covering portion 20 is joined, a plug 48 is disposed in the joining groove 47 so as to cover the joining material 46.

[0022] Regarding each intermediate support portion 40, it is sufficient that a plurality of second joining portions 42b are arranged at intervals in the extending direction of the H-shaped steel 12. Therefore, the first intermediate support member 41 may be a member provided locally according to the position of the second joining portion 42b, or may be a continuous member extending from one end portion to the other end portion of the H-shaped steel 12. The same applies to the second intermediate support member 42.

[0023] (Outer support portion) As shown in FIG. 3, the outer support portion 50 includes a first outer support member 51 and a second outer support member 52. The first outer support member 51 is a steel material fixed to the lower flange 14 of the H-shaped steel 12.

[0024] 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 fixed to the lower flange 14 of the H-shaped steel 12 by, for example, 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.

[0025] In the first embodiment, the first outer support member 51 is composed of an angle member arranged such that the extending direction of the H-shaped steel 12 is the material axis direction. The first fixing portion 51a of the first outer support member 51 is welded to the lower flange 14 such that the first connecting portion 51b extends outward in the forming direction from slightly inside the outer end surface of the lower flange 14 in the width 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.

[0026] The second outer support member 52 is a steel material that is connected to the first outer support member 51 and to which the refractory material 31 of the width-side covering portion 20 and the flange-side covering portion 30 is joined. The second outer support member 52 is connected to the first outer support member 51 by a joining material 53 that joins the width-side covering portion 20 to the first outer support member 51 and the second outer support member 52. The joining material 53 is a width-side joining material that joins the width-side covering portion to the outer support portion.

[0027] The second outer support member 52 has a width-side joint portion 52a and a flange-side joint portion 52b. The width-side joint portion 52a has a contact surface that extends outward in the forming direction from the outside of the first outer support member 51 in the width direction and 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 portion 52b has a contact surface that extends in the width direction from the outside of the first outer support member 51 in the forming direction and against which the flange-side covering portion 30 abuts, and is a planar portion to which the refractory material 31 of the flange-side covering portion 30 is joined. In the first embodiment, the second outer support member 52 is composed of, for example, an angle member arranged such that the extending direction of the H-shaped steel 12 is the material axis direction.

[0028] The width-side joint portion 52a is joined with the width-side covering portion 20 by a joining material 53. The joining material 53 is, for example, a screw. After the joining material 53 is inserted into a joining end opening 54 formed in the woody material 22, it penetrates the width-side covering portion 20 and is joined to the width-side joint portion 52a and the first connecting portion 51b of the first outer support member 51. After the width-side covering portion 20 is joined, a plug 55 is disposed in the joining end opening 54 so as to cover the joining material 53. The flange-side joint portion 52b is joined with the refractory material 31 by a joining material 56. The joining material 56 is composed of, for example, a screw and a washer. The joining material 56 is a flange-side joining material that joins the flange-side covering portion to the outer support portion.

[0029] (Construction method of refractory covering structure) With reference to FIGS. 4 to 7, an example of the construction method of the refractory covering structure 10 will be described. Here, a case where the H-shaped steel 12 is covered with the width-side covering portion 20 and the flange-side covering portion 30 in a factory or the like will be described.

[0030] The construction method of the refractory covering structure 10 includes a preparation step, a width-side covering portion arrangement step, a flange-side covering portion arrangement step, and a joining step. As shown in FIG. 4, in the preparation step, various operations are performed on the H-shaped steel 12. In FIG. 4, the H-shaped steel 12 is shown with the lower flange 14 positioned upward.

[0031] Specifically, the first intermediate support member 41 of the intermediate support portion 40 and the first outer support member 51 of the outer support portion 50 are welded at a predetermined position. Further, the second intermediate support member 42 of the intermediate support portion 40 is temporarily attached to the first intermediate support member 41 using a fastening member 45. Thereafter, 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-like material against the upper flange 13, the lower flange 14, and the second intermediate support member 42 from the outside in the width direction. Also, the position adjustment is performed, for example, based on the result 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 tightening the fastening member 45.

[0032] Also, as shown in FIG. 5, in the preparation step, a width-side covering set is produced. Specifically, a refractory material 21 is attached to the wooden material 22 formed with each small end 34, 47, 54 using screws or the like not shown in the figure. Further, a second outer support member 52 of the outer support portion 50 is attached to a predetermined position of the refractory material 21 and the wooden material 22 using screws or the like not shown in the figure.

[0033] As shown in FIG. 6, in the width-side covering portion arrangement step, the width-side covering portion 20 is arranged at a position where it can be joined to each support portion 40, 50 using joining materials 46, 53. Specifically, the H-shaped steel 12 is arranged with the lower flange 14 facing upward. Then, the width-side covering set is brought closer from above, the second outer support member 52 is hooked on the first outer support member 51 of the outer support portion 50, and then the position of the width-side covering set in the extending direction of the H-shaped steel 12 is adjusted.

[0034] As shown in FIG. 7, in the flange-side covering portion arrangement step, first, a refractory material 31 is joined to the second outer support member 52 of the outer support portion 50. Specifically, the refractory material 31 is fitted from above between a pair of refractory materials 21 in the width direction. Then, the refractory material 31 is joined to the second outer support member 52 of the outer support portion 50 using a joining material 56.

[0035] Next, as shown in FIG. 8, in the flange-side covering portion arrangement step, a 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.

[0036] In the joining step, the width-side covering portion 20 is joined to the intermediate support portion 40 using the joining material 46, and the width-side covering portion 20 is joined to the outer support portion 50 using the joining material 53. Also, the wooden material 22 and the wooden material 32 are joined using the joining material 33. Then, inserts 35, 48, 55 are disposed at each small end 34, 47, 54. In this way, the H-shaped steel 12 covered with fireproof material by the width-side covering portion 20 and the flange-side covering portion 30 is transported to the installation location and then installed at a desired position.

[0037] 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 the intermediate support portion 40. The intermediate support portion 40 includes a first intermediate support member 41 fixed to the H-shaped steel 12, and a second intermediate support member 42 that is connected to the first intermediate support member 41, has a contact 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.

[0038] According to such a configuration, since the degree of freedom regarding the arrangement of the second joint portion 42b in the forming direction is improved, even if the forming direction of the H-shaped steel 12 becomes larger, support points of the width-side covering portion 20 can be provided at appropriate positions in the forming direction. Further, since the second intermediate support member 42 has a contact surface, the width-side covering portion 20 can be firmly joined to the intermediate support portion 40. As a result, even if a fire occurs, the dropping of the width-side covering portion 20 can be more reliably suppressed.

[0039] Also, the second intermediate support member 42 can be connected after adjusting the position with respect to the first intermediate support member 41. Thereby, the contact surface against which the width-side covering portion 20 abuts can be arranged without depending on the positions of the outer end portions of the flanges 13, 14 in the width direction. That is, the second joint portion 42b can be easily arranged at a desired position according to the manufacturing error of the H-shaped steel 12.

[0040] (1-2) The second intermediate support member 42 is connected to the first intermediate support member 41 by a fastening member 45. A long hole-shaped fastening hole 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. According to such a configuration, the position adjustment of the second intermediate support member 42 with respect to the first intermediate support member 41 can be easily performed.

[0041] (1-3) The first intermediate support member 41 is fixed to the web 15. According to such a 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 constituted by an angle material. Thereby, since one side portion of the angle material can be fixed to the web 15, the joining strength between the web 15 and the first intermediate support member 41 can be increased.

[0042] (1-5) The second intermediate support member 42 is composed of a square steel pipe. Thereby, the strength of the second intermediate support member 42 to which the width-side covering portion 20 is joined can be increased. (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 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. According to such a configuration, the manufacturing errors occurring in the H-shaped steel 12 can be effectively absorbed by the outer support portion 50.

[0043] (1-7) The first outer support member 51 and the second outer support member 52 are connected by a joining member 53. Thereby, the second outer support member 52 can be joined to the width-side covering portion 20 before connecting the first outer support member 51 and the second outer support member 52. Therefore, by arranging the H-shaped steel 12 such that the lower flange 14 is positioned upward, the second outer support member 52 can be hooked on the first outer support member 51 to support the width-side covering portion 20. As a result, the workability when covering the H-shaped steel 12 with the width-side covering portion 20 can be improved. In addition, since the width-side joint portion 52a can be arranged at a position away from the first outer support member 51, the manufacturing errors occurring in the H-shaped steel 12 can be more effectively absorbed.

[0044] (1-8) The second outer support member 52 of the outer support portion 50 is a through member extending from one end to the other end of the H-shaped steel 12. Thereby, even if the joint portion between the refractory material 21 and the refractory material 31 disappears during a fire, the intrusion of flames into the interior can be suppressed.

[0045] (Second Embodiment) Referring to FIGS. 9 to 14, a second embodiment of the fireproof coating structure will be described. In the second embodiment, parts different from the first embodiment will be described in detail, and parts the same as those in the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0046] (Refractory material) As shown in FIG. 9, in the refractory material 21, the inner refractory material 21A is provided such that the end in the forming direction faces the flanges 13 and 14 from the outside in the width direction. Further, in the refractory material 31, the inner refractory material 31A is provided such that the end face abuts against the outer refractory material 21B of the refractory material 21.

[0047] (Intermediate support part) The intermediate support part 60 has a first intermediate support member 61 and a second intermediate support member 62. The first intermediate support member 61 is a fixing member made of a steel material fixed to each of the upper flange 13 and the lower flange 14, for example, by welding. The second intermediate support member 62 is composed of an erection member 63 and a covering part 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 long in the width direction is formed as a fastening hole through which the bolt of the fastening member 45 penetrates in one of the first intermediate support member 61 and the erection member 63. The erection member 63 is configured to be position-adjustable in the width direction when the fastening member 45 is in a temporarily fixed state. The erection member 63 supports the covering part support member 64. The covering part support member 64 is a steel material fixed to the erection member 63 by welding or the like.

[0048] As shown in FIG. 10, in the second embodiment, the first intermediate support member 61 is formed by a channel member that opens toward the inside in the forming direction and is arranged such that the width direction of the H-shaped steel 12 becomes the material axis direction. The bottom surface portion of the channel member is the first fixing portion 61a, and the side surface portion of the channel member is the first connecting portion 61b.

[0049] In addition, the erection member 63 is composed of an angle steel pipe arranged such that the forming direction of the H-shaped steel 12 is the material axis direction. In the erection member 63, each end portion in the forming direction is the second connecting portion 62a. The covering portion support member 64 is composed of an angle steel pipe arranged such that the extending direction of the H-shaped steel 12 is the material axis direction. In the covering portion support member 64, the side surface portion facing the outside in the width direction is the second joining portion 62b. The covering portion support member 64 may be a locally provided member or a through member extending from one end portion to the other end portion of the H-shaped steel 12. Also, in FIG. 9, two covering portion support members 64 are joined to one erection member 63, but it is also possible to join three or more covering portion support members 64 to one erection member 63.

[0050] (Outer support portion) 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 joining portion 52a of the second outer support member 52 are joined by welding.

[0051] The first outer support member 51 is fixed to the lower flange 14 after position adjustment in the width direction. The first fixing portion 51a of the first outer support member 51 is welded to the lower flange 14 such that the first connecting portion 51b extends outward in the forming direction from slightly outside the outer end surface of the lower flange 14 in the width direction. Specifically, the first outer support member 51 is welded to the lower flange 14 after position adjustment in the width direction such that the width-side joining portion 52a of the second outer support member 52 is arranged outside the inner refractory material 21A in the forming direction and abuts against the outer refractory material 21B of the width-side covering portion 20.

[0052] The width-side joining portion 52a of the second outer support member 52 is joined to the first connecting portion 51b of the first outer support member 51 by welding. Specifically, the second outer support member 52 is adjusted in position in the forming direction while the width-side joining portion 52a is brought into contact with the first connecting portion 51b of the first outer support member 51. After position adjustment, the width-side joining portion 52a of the second outer support member 52 is welded to the first connecting portion 51b of the first outer support member 51. Note that the position adjustment of the outer support members 51 and 52 is performed based on, for example, the result of measuring the dimensions of the H-shaped steel 12.

[0053] (Construction method of fireproof coating structure) With reference to FIGS. 12 to 14, an example of the construction method of the fireproof coating structure 10 will be described. Here, the case where the H-shaped steel 12 is coated with the width-side coating portion 20 and the flange-side coating portion 30 in a factory or the like will be described.

[0054] The construction method of the fireproof coating structure 10 includes a preparation process, a first joining process, and a second joining process. As shown in FIG. 12, in the preparation process, various operations are performed on the H-shaped steel 12. In FIG. 12, the H-shaped steel 12 is shown with the lower flange 14 positioned upward.

[0055] Specifically, the first intermediate support member 61 of the intermediate support portion 60 is welded to predetermined positions of the respective flanges 13 and 14. Further, a coating portion support member 64 is welded to a predetermined position of the erection member 63 to fabricate the second intermediate support member 62. Then, the second intermediate support member 62 is erected in a temporarily fixed state on the pair of first intermediate support members 61 using the fastening member 45. Thereafter, the position of the second intermediate support member 62 in the width direction is adjusted so that the width-side coating portion 20 can abut against the coating 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 member 45.

[0056] Further, after adjusting the position of the first outer support member 51 of the outer support portion 70, the first outer support member 51 is welded to the lower flange 14. Further, 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.

[0057] Furthermore, in the preparation process, the width-side coating portion 20 is fabricated. Specifically, the refractory 21 is attached to the wooden material 22 in which each end edge 34, 47, 54 is formed using screws or the like (not shown). As shown in FIG. 13, in the first joining step, the refractory material 31 is joined to the second outer support member 52 of the outer support portion 50. Specifically, after arranging the H-shaped steel 12 with the lower flange 14 facing upward, the refractory material 31 is brought closer from above and placed on the flange-side joining portion 52b of the second outer support member 52. Then, after the position of the refractory material 31 is adjusted, the refractory material 31 is joined to the flange-side joining portion 52b by the joining material 56.

[0058] As shown in FIG. 14, in the second joining step, the width-side covering portion 20 is joined to the intermediate support portion 60 using the joining material 46, and the width-side covering portion 20 is joined to the outer support portion 50 using the joining material 53. Also, the wooden material 22 and the wooden material 32 are joined using the joining material 33. Then, the blocking timbers 35, 48, 55 are disposed at the respective ends 34, 47, 54. In this way, the H-shaped steel 12 covered with fire resistance by the width-side covering portion 20 and the flange-side covering portion 30 is transported to the installation location and then installed at a desired position.

[0059] According to the fire-resistant covering 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.

[0060] (2-1) The intermediate support portion 60 includes a second intermediate support member 62 composed of a first intermediate support member 61 fixed to each of the flanges 13, 14, a bridging member 63 installed on the first intermediate support member 61, and a covering portion support member 64 joined to the bridging member 63. According to such a configuration, it is possible to join three or more covering portion support members 64 to one bridging member 63. That is, since the degree of freedom of the second joining portion 62b that can be arranged with respect to the two first intermediate support members 61 is improved, the load of the fixing work of the first intermediate support member 61 to the H-shaped steel 12 can be reduced.

[0061] (2-2) By adjusting the position of the bridging member 63 in the width direction, it is possible to simultaneously adjust the positions of a plurality of second joining portions 62b arranged in the forming direction. (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 such that the lower flange 14 is positioned upward, the joining operation of the refractory material 31 can be performed in a state where it is placed on the second outer support member 52. As a result, the workability during the joining of the refractory material 31 can be improved.

[0062] (2-4) The refractory material 21 is composed of an inner refractory material 21A and an outer refractory material 21B laminated in the width direction. Further, the outer support portion 70 is provided so as to protrude from the outer end surface of the lower flange 14 in the width direction. According to such a configuration, the positions of the covering portions 20, 30 can be adjusted by the joining position of the first outer support member 51 with respect to the H-shaped steel 12 in the width direction and the joining position of the second outer support member 52 with respect to the first outer support member 51 in the longitudinal direction. As a result, while covering the H-shaped steel 12 with the refractory material, the outer support portion 70 can be provided so that the manufacturing error of the H-shaped steel 12 is more reliably absorbed.

[0063] The first and second embodiments can be implemented with the following modifications. The first embodiment, the second embodiment, and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0064] · The refractory coating structure may be realized by combining the intermediate support portion 40 of the first embodiment and the outer support portion 70 of the second embodiment, or may be realized by combining the outer support portion 50 of the first embodiment and the intermediate support portion 60 of the second embodiment.

[0065] · In the intermediate support portion 60 of the second embodiment, the erection member 63 may be fixed to the fixing member by welding or the like to serve as the first intermediate support member, and the covering portion support member 64 connected to the erection member 63 by the fastening member 45 may serve as the second intermediate support member.

[0066] ·In the above embodiment, the floor slab 11 covers the upper flange 13 of the H-shaped steel 12 from the outside in the forming direction. However, the present invention is not limited to this, and a 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 forming direction. Further, in the flange-side covering portion 30, the refractory material 31 and the wood material 32 may be joined to the flange-side joint portion 52b by the joining material 56.

[0067] ·The fire-resistant covering structure is not limited to the H-shaped steel 12 installed as a beam, and may be applied to the H-shaped steel 12 installed as a column. ·The intermediate support portion may have a contact surface where the width-side covering portion 20 contacts at a position away from the flanges 13 and 14, and a second joint portion 42b where the width-side covering portion 20 is joined by the joining material 46. Therefore, the intermediate support portion may be constituted by, for example, an angle steel pipe or a channel material joined to the web 15 with the extending direction of the H-shaped steel 12 as the material axis direction.

[0068] ·The outer support portion may have a configuration in which the width-side covering portion 20 and the flange-side covering portion 30 are joined to the second outer support member on the outside of the pair of flanges 13 and 14 in the forming direction of the H-shaped steel 12. Therefore, the outer support portion may have, for example, a configuration in which the first fixing portion 51a of the first outer support member 51 is fixed to the lower flange 14 inside the pair of flanges 13 and 14 in the forming direction of the H-shaped steel 12.

[0069] The technical idea grasped from the above embodiment and the modification example will be described. (Appendix 1) In the fire-resistant covering structure, the first intermediate support member is constituted by an angle material, and the second intermediate support member is constituted by an angle steel pipe.

[0070] (Appendix 2) In the fire-resistant covering structure, the first outer support member and the second outer support member are connected by welding.

[0071] (Appendix 3) In the fireproof coating structure, the second outer support member is a continuous member that extends from one end to the other end of the H-shaped steel in the extending direction of the H-shaped steel.

Explanation of reference numerals

[0072] 10…Fireproof coating structure, 11…Floor slab, 12…H-shaped steel, 13…Upper flange, 14…Lower flange, 15…Web, 20…Width-side coating part, 21…Refractory material, 21A…Inner refractory material, 21B…Outer refractory material, 22…Wooden material, 30…Flange-side coating part, 31…Refractory material, 31A…Inner refractory material, 31B…Outer refractory material, 32…Wooden material, 33…Joining material, 34…Joint end, 35…Embedded wood, 40…Intermediate support part, 41…First intermediate support member, 41a…First fixing part, 41b…First connecting part, 42…Second intermediate support member, 42a…Second connecting part, 42b…Second joint part, 45…Fastening member, 46…Joining material, 47…Joint end, 48…Embedded wood, 50…Outer support part, 51…First outer support member, 51a…First fixing part, 51b…First connecting part, 52…Second outer support member, 52a…Width-side joint part, 52b…Flange-side joint part, 53…Joining material, 54…Joint end, 55…Embedded wood, 56…Joining material, 60…Intermediate support part, 61…First intermediate support member, 61a…First fixing part, 61b…First connecting part, 62…Second intermediate support member, 62a…Second connecting part, 62b…Second joint part, 63…Erection material, 64…Coating part support member, 70…Outer support part.

Claims

1. An H-shaped steel having a pair of flanges and a web connecting the pair of flanges, an intermediate support portion supported by the H-shaped steel and disposed between the pair of flanges, and a fireproof coating portion joined to the intermediate support portion by a joining material and covering the H-shaped steel from the outside in the width direction. The intermediate support portion has a contact surface with which the fireproof coating portion abuts at a position away from the pair of flanges, and has a joint portion to which the fireproof coating portion is joined by the joining material. A fireproof coating structure.

2. A first intermediate support member fixed to the H-shaped steel, and a second intermediate support member connected to the first intermediate support member and having the joint portion. The fireproof coating structure according to Claim 1.

3. The second intermediate support member is connected to the first intermediate support member by a fastening member. A long hole-shaped fastening hole that is long in the width direction is formed in one of the first intermediate support member and the second intermediate support member. The fireproof coating structure according to Claim 2.

4. The first intermediate support member is fixed to the web. The fireproof coating structure according to Claim 2 or 3.

5. The first intermediate support member includes a fixing member fixed to each of the pair of flanges. The second intermediate support member includes a coating support member to which the fireproof coating portion is joined. One of the first intermediate support member and the second intermediate support member includes a bridging member bridged over the pair of fixing members and supporting the coating support member. The fireproof coating structure according to Claim 2 or 3.

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