Fire-resistant covering structure

Abstract

To suppress a decrease in fire resistance performance due to the burning of a wood-based fire-resistant covering material in a joint portion where the outside of the fire-resistant covering material of at least one of a steel column and a steel beam is made of the wood-based fire-resistant covering material.SOLUTION: In a fire-resistant covering structure 100 at a joint portion 11 between a steel column 20 fire-resistant coated with a column-side fire-resistant coating material 120 and a steel beam 50 fire-resistant coated with a beam-side fire-resistant coating material 150, a column-side fire-resistant base material 122 and a beam-side fire-resistant base material 152 are in contact with each other at the joint portion 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fire-resistant covered structure. [Background technology]

[0002] Patent Document 1 discloses a technique for a fire-resistant structure having a lath sheet fixed to a reinforcing material and a fire-resistant coating material sprayed onto the surface of the lath sheet on which the lath is formed. In this prior art, the reinforcing material is arranged horizontally between the steel beam and the partition wall, extending from the steel beam to the position of the partition wall, the surface on which the lath is formed is the underside of the lath sheet, and the fire-resistant coating material on the underside of the lath sheet and the fire-resistant coating material sprayed onto the steel beam are continuous.

[0003] Patent Document 2 discloses a technique relating to a joint structure and a joint method between a dry-construction fire-resistant partition wall and a column / beam, which is constructed between upper and lower horizontal fire-resistant compartments. In this prior art, the end or upper end of the fire-resistant partition wall cuts the fire-resistant coating of the column or beam and reaches the surface of the column or beam. In the hollow part of the fire-resistant partition wall, an intra-wall fire-resistant material that is connected to the wall material is arranged. The intra-wall fire-resistant material is fire-resistantly continuous with the fire-resistant coating material via the wall material, and the fire-resistant coating that completely covers the column or beam is formed by the fire-resistant coating material, the wall material, and the intra-wall fire-resistant material. The fire-resistant coating material of the column or beam is installed after the wall material of the fire-resistant partition wall and the intra-wall fire-resistant material are installed.

[0004] Patent Document 3 discloses a technique relating to a structure and method for assembling a fire-resistant partition wall to a column or beam made of a steel structural member. In this prior art, the upper end of the fire-resistant partition wall is butted against the lower surface of the steel structural member, and multiple molded fire-resistant coating materials are arranged around the steel structural member via multiple bases attached to the steel structural member. The molded fire-resistant coating material covering the lower part of the steel structural member is divided into two parts with the fire-resistant partition wall in between, and the ends of the divided molded fire-resistant coating materials are connected to the surface of the fire-resistant partition wall, so that the molded fire-resistant coating material and the fire-resistant partition wall are integrated to ensure the specified fire resistance of the steel structural member and form a fire compartment.

[0005] Patent Document 4 discloses a technology relating to a sound-insulating and fire-resistant structure in which a sound-insulating wall is provided within a framework made up of steel members with fire-resistant coating. In this prior art, a sound-insulating material is provided at the end of the sound-insulating wall that abuts against the fire-resistant coating, and the sound-insulating material is formed to protrude outward from the end of the sound-insulating wall in the wall thickness direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7267473 [Patent Document 2] JP 2003-064804 A [Patent Document 3] JP 2008-240355 A [Patent Document 4] JP 2011-163042 A Summary of the Invention [Problem to be solved by the invention]

[0007] In some cases, the exterior of the fire-resistant covering material of at least one of the fire-resistant covered steel columns and the fire-resistant covered steel beams is made of a wood-based fire-resistant covering material. In such a joint between a fire-resistant covered steel column and a fire-resistant covered steel beam, if the wood-based fire-resistant covering material is burned down and a gap is created in the fire-resistant covering material, there is a risk that the fire resistance performance will be significantly reduced.

[0008] In view of the above-mentioned facts, the present invention aims to suppress the deterioration of fire resistance performance due to the burning of wood fire-resistant covering material in joints where the outer surface of the fire-resistant covering material of at least one of the steel columns and steel beams is made of wood fire-resistant covering material. [Means for solving the problem]

[0009] The first aspect is a fire-resistant coating structure for a joint between a fire-resistant coated steel column and a fire-resistant coated steel beam, in which a column-side fire-resistant base material is provided around the steel column, a beam-side fire-resistant base material is provided around the steel beam, and a wood-based fire-resistant coating material is provided around at least one of the column-side fire-resistant base material and the beam-side fire-resistant base material, and the column-side fire-resistant base material and the beam-side fire-resistant base material are in contact with each other at the joint.

[0010] In the fire-resistant covered structure of the first embodiment, the column-side fire-resistant base material and the beam-side fire-resistant base material are in contact with each other at the joint between the fire-resistant covered steel column and the fire-resistant covered steel beam, so that the fire-resistant covering does not have gaps even if the wood fire-resistant covering material is burned down. Therefore, the deterioration of fire resistance is suppressed compared to the case where gaps are created when the wood fire-resistant covering material is burned down.

[0011] A second aspect is a fire-resistant coating structure described in the first aspect, in which one side of the column-side fire-resistant base material and the beam-side fire-resistant base material having a large thermal expansion coefficient is in contact with the other end face having a small thermal expansion coefficient.

[0012] In the fireproof covering structure of the second embodiment, the end face of the other fireproof base material (the one with the smaller thermal expansion coefficient of the column side fireproof base material and the beam side fireproof base material) having a smaller thermal expansion coefficient is in contact with the side face of the one fireproof base material (the one with the larger thermal expansion coefficient of the column side fireproof base material and the beam side fireproof base material) having a larger thermal expansion coefficient of the column side fireproof base material and the beam side fireproof base material. In other words, the other end face of the column side fireproof base material and the beam side fireproof base material having a smaller thermal expansion coefficient is in contact with one side face of the column side fireproof base material and the beam side fireproof base material having a larger thermal expansion coefficient. Therefore, even if the one fireproof base material having a larger thermal expansion coefficient thermally expands, the other fireproof base material having a smaller thermal expansion coefficient is not damaged, so that the deterioration of fireproof performance is prevented or suppressed.

[0013] A third aspect is a fire-resistant coating structure according to the first aspect, in which one end face of the column-side fire-resistant base material and the beam-side fire-resistant base material having flexibility is in contact with the other end face.

[0014] In the fireproof covering structure of the third embodiment, the end face of one of the fireproof underlayments (the flexible one of the column-side fireproof underlayment and the beam-side fireproof underlayment) that has flexibility is in contact with the side face of the other fireproof underlayment (the other of the column-side fireproof underlayment and the beam-side fireproof underlayment). Even if the other fireproof underlayment expands due to heat, the one of the fireproof underlayments that has flexibility simply follows and deforms, and is not damaged. Therefore, deterioration of fireproof performance is prevented or suppressed.

[0015] The fourth aspect is a fire-resistant coating structure for a joint between a fire-resistant coated steel column and a fire-resistant coated steel beam, in which a column-side fire-resistant base material is provided around the steel column, a beam-side fire-resistant base material is provided around the steel beam, and a wood-based fire-resistant coating material is provided around at least one of the column-side fire-resistant base material and the beam-side fire-resistant base material, the outer periphery of the joint is composed of a joint-side fire-resistant member, and in the joint, the column-side fire-resistant base material and the beam-side fire-resistant base material are each in contact with the joint-side fire-resistant member.

[0016] In the fourth embodiment of the fire-resistant covering structure, in the joint between the fire-resistant covered steel column and the fire-resistant covered steel beam, the column-side fire-resistant base material and the beam-side fire-resistant base material are in contact with the joint-side fire-resistant member, so that no gaps will be created in the fire-resistant covering even if the wood fire-resistant covering material is burned down. Therefore, the deterioration of fire resistance is suppressed compared to the case where gaps are created when the wood fire-resistant covering material is burned down. Effect of the Invention

[0017] According to the present invention, it is possible to suppress the deterioration of fire resistance performance caused by burning of a wood fire-resistant coating material. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a vertical cross-sectional view taken along the X direction of a joint portion to which the fire-resistant covering structure of the first embodiment is applied. [Diagram 2] 1 is a horizontal cross-sectional view of a joint portion to which the fire-resistant covering structure of the first embodiment is applied. FIG. [Diagram 3]FIG. 11 is a vertical cross-sectional view taken along the X direction of a joint portion to which a fire-resistant covering structure according to a modified example of the first embodiment is applied. [Figure 4] 1 is a horizontal cross-sectional view of a joint portion to which a fire-resistant covering structure according to a modified example of the first embodiment is applied. FIG. [Diagram 5] FIG. 11 is a vertical cross-sectional view taken along the X direction of a joint portion to which the fire-resistant covering structure of the second embodiment is applied. [Figure 6] 6 is a horizontal cross-sectional view of a joint portion to which a fire-resistant covering structure of a second embodiment is applied. FIG. [Figure 7] 13 is a horizontal cross-sectional view of a joint portion to which a fire-resistant covering structure of a third embodiment is applied. FIG. [Figure 8] A horizontal cross-section of a fire-resistant coated steel column. [Figure 9] FIG. 2 is a vertical cross-section of a fire-resistant coated steel beam. [Figure 10] FIG. 2 is an enlarged view of a main part of FIG. [Figure 11] FIG. 11 is an enlarged view corresponding to FIG. 10 of a first comparative example. [Figure 12] FIG. 11 is an enlarged view corresponding to FIG. 10 of a second comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] First Embodiment A fire-resistant covering structure according to a first embodiment of the present invention will be described. Two directions perpendicular to the horizontal direction are designated as X-direction and Y-direction, and are indicated by arrows X and Y, respectively. A vertical direction perpendicular to the X-direction and Y-direction is designated as Z-direction, and is indicated by arrow Z.

[0020] [composition] First, the configuration of the fire-resistant covered structure 100 of this embodiment at a joint portion where a fire-resistant covered steel column and a fire-resistant covered steel beam are joined will be described.

[0021] Fig. 1 shows a vertical cross section of a joint 11 at which a fire-resistant coated steel column 20 and fire-resistant coated steel beams 50A, 50B, 50C, and 50D (see also Fig. 2) are joined, and Fig. 2 shows a horizontal cross section. In this embodiment, as shown in Fig. 2, the steel column 20 is made of a square steel pipe (see also Fig. 8), and as shown in Fig. 1, the steel beams 50A, 50B, 50C, and 50D (see also Figs. 2 and 9) are made of H-shaped steel, but the present invention is not limited to these.

[0022] In the following description, when there is no need to distinguish between the steel beams 50A, 50B, 50C, and 50D, the letters A, B, C, and D after the reference numerals may be omitted and the beams may be described as steel beam 50. Furthermore, the letters A, B, C, and D after the reference numerals of other members may also be omitted and the beams may be described as steel beam 50.

[0023] 1, the steel beam 50 is an H-shaped steel as described above, and is a steel material that forms an H shape with an upper flange 52, a lower flange 54, and a web 56. A reinforced concrete slab 15 is provided on the upper flange 52 of the steel beam 50. In this embodiment, the steel beam 50C extending to the left in FIGS. 1 and 2 has a smaller beam depth than the other steel beams 50A, 50B, and 50C, but this is not limited to this.

[0024] As shown in Figures 1 and 2, steel beams 50A, 50B, 50C, and 50D are each joined to each side surface 22 of a steel column 20. As shown in Figure 1, a steel diaphragm 12 corresponding to the beam configuration is provided inside the steel column 20. Note that the joint structure between the steel column 20 and the steel beam 50 is a structure using existing technology, so detailed illustration and description will be omitted.

[0025] As shown in FIG. 1, FIG. 2 and FIG. 8, a column side fire-resistant coating material 120 is provided around the steel column 20. As shown in FIG. 2 and FIG. 8, the column side fire-resistant coating material 120 is provided at a distance from the side surface 22 of the steel column 20. As shown in FIG. 8, in this embodiment, the column side fire-resistant coating material 120 is fixed to a fixing bracket 190 made of a lip channel steel joined to the side surface 22 of the steel column 20 with a screw 192, but this is one example and is not limited thereto. For example, the technology of JP 2023-084597 A can be used.

[0026] As shown in Fig. 8, the column-side fire-resistant covering material 120 has a cylindrical horizontal cross section and is configured by laminating a cylindrical column-side fire-resistant base material 122 and a cylindrical column-side wood fire-resistant covering material 124. The column-side fire-resistant base material 122 and the column-side wood fire-resistant covering material 124 are joined by adhesive, screws, or the like.

[0027] In this embodiment, the column-side fire-resistant base material 122 is composed of multiple metal plates 121. In addition, the column-side wood fire-resistant covering material 124 in this embodiment is composed of multiple laminated lumber 123. Furthermore, a countersunk hole 194 into which a screw 192 is inserted is formed on the outer surface of the column-side wood fire-resistant covering material 124. In this embodiment, the outer surface of the column-side wood fire-resistant covering material 124 is covered with a decorative board 102. It is not necessary for it to be covered with the decorative board 102.

[0028] As shown in Fig. 9, beam-side fire-resistant covering materials 150A, 150B, 150C, and 150D are provided on the upper side of each steel beam 50A, 50B, 50C, and 50D (see Fig. 2), i.e., around the periphery except for the slab 15 side. Note that Fig. 9 shows the cross-sectional structure of the steel beam 50B, but the other steel beams 50A, 50C, and 50D have the same cross-sectional structure. Therefore, in the following explanation of Fig. 9, the "B" after the reference numerals will be omitted.

[0029] As shown in FIG. 9, the beam-side fire-resistant coating material 150 is provided at intervals from the side end of the upper flange 52 of the steel beam 50, the side end of the lower flange 54, and the lower surface of the lower flange 54. In this embodiment, the beam-side fire-resistant coating material 150 is fixed to a fixing bracket 190 made of a lip channel steel joined to the lower surface of the upper flange 52 of the steel beam 50, the upper surface of the lower flange 54, and the lower surface of the lower flange 54 with a screw 192, similar to the column-side fire-resistant coating material 120 described above (see FIG. 8), but this is one example and is not limited thereto. Similarly, the technology of JP 2023-084597 A can be used.

[0030] The beam-side fireproof covering material 150 is constructed by laminating a non-combustible beam-side fireproof base material 152 having a U-shaped vertical cross section perpendicular to the beam direction and a U-shaped beam-side wood fireproof covering material 154. The beam-side fireproof base material 152 and the beam-side wood fireproof covering material 154 are joined by adhesive, screws, or the like.

[0031] In this embodiment, the beam-side fire-resistant base material 152 is composed of a plurality of gypsum boards 151. Moreover, in this embodiment, the beam-side wood fire-resistant covering material 154 is composed of a plurality of laminated lumber 153. A countersunk hole 194 into which a screw 192 is inserted is formed on the outer surface of the beam-side wood fire-resistant covering material 154. Furthermore, in this embodiment, the outer surface of the beam-side wood fire-resistant covering material 154 is covered with the decorative board 102, but it does not have to be covered with the decorative board 102.

[0032] In addition, the fixing brackets 190, the screws 192, the countersunk holes 194, and the decorative panels 102 are omitted from the drawings other than Figures 8 and 9. This also applies to the following modified examples and embodiments. In addition, the joining structures of the column-side fire-resistant covering material 120 and the beam-side fire-resistant covering material 150 to the steel column 20 and the steel beam 50 shown in Figures 8 and 9 are merely examples, and are not limited to these.

[0033] As described above, the column-side fire-resistant base material 122 is made of the metal plate 121 and has a large thermal expansion coefficient. In contrast, the beam-side fire-resistant base material 152 is made of the gypsum board 151 and has a very small thermal expansion coefficient and hardly expands at all. In other words, the thermal expansion coefficient of the column-side fire-resistant base material 122 is larger than that of the beam-side fire-resistant base material 152.

[0034] As shown in Fig. 1, the lower end portions of the column-side fire-resistant covering material 120 above the slab 15, that is, the lower end portion 127 of the column-side fire-resistant base material 122 and the lower end portion 129 of the column-side wood fire-resistant covering material 124, are in contact with or embedded in the slab 15. If gaps are generated during construction, they may be filled with the same material or with a fire-resistant material, such as fire-resistant putty, rock wool, or AES wool.

[0035] 1 and 9, the upper ends of the beam-side fire-resistant covering material 150 below the slab 15, that is, the upper ends of the beam-side wood fire-resistant covering material 154 and the upper ends of the beam-side fire-resistant base material 152, are in contact with or embedded in the slab 15. Similarly, if gaps occur during construction, they may be filled with the same material or with a fire-resistant material, such as fire-resistant putty, rock wool, and AES wool.

[0036] (Fit of fireproof coating material at joints) Next, the fit of the column-side fire-resistant covering material 120 and the beam-side fire-resistant covering material 150 in the joint portion 11, which is the main part of the invention, will be explained.

[0037] 2, openings 119A, 119B, 119C, and 119D are formed in the column-side wood fire-resistant covering material 124 of the column-side fire-resistant covering material 120 at the portions where it interferes with the steel beam 50. The portions of the column-side wood fire-resistant covering material 124 other than the openings 119 at the joint portion 11 are referred to as an upper portion 139. Also, slits 118A, 118B, 118C, and 118D are formed in the beam-side fire-resistant base material 152 of the beam-side fire-resistant covering material 150 at the portions where it interferes with the bottom flange 54 and web 56 of the steel beam 50.

[0038] As shown in Figures 1, 2 and 10, in the joint portion 11, the end faces 156A, 156B, 156C, 156D of the beam side wood fire-resistant coating materials 154A, 154B, 154C, 154D of each beam side fire-resistant coating material 150A, 150B, 150C, 150D are in contact with and joined to the side surface 126 of the column side wood fire-resistant coating material 124 of the column side fire-resistant coating material 120.

[0039] Furthermore, at the joint portion 11, the end faces 132A, 132B, 132C, 132D of the beam side wood fire-resistant coating materials 152A, 152B, 152C, 152D of each beam side fire-resistant coating material 150A, 150B, 150C, 150D are in contact with and joined to the side surface 130 of the column side fire-resistant base material 122 of the column side fire-resistant coating material 120.

[0040] In this way, the joint section 11 is surrounded by the column side wood fireproof covering material 124 of the column side fireproof covering material 120 and the beam side wood fireproof covering material 154 of the beam side fireproof covering material 150. In addition, in the space surrounded by the column side wood fireproof covering material 124 and the beam side wood fireproof covering material 154, the end face 132 of the beam side fireproof covering material 152 is in contact with the side face 130 of the column side fireproof base material 122 and joined. In other words, in the joint section 11, the non-combustible column side fireproof covering material 122 and the non-combustible beam side fireproof covering material 152 are always in contact with each other, and there is no non-contact portion, that is, there is no gap between them. In addition, if a gap is formed between the end face 132 of the beam side fireproof covering material 152 and the side face 130 of the column side fireproof covering material 122 due to construction, the gap is filled with the same material as the beam side fireproof covering material 152. This case also includes a configuration in which the end face 132 of the beam side fire-resistant base material 152 is in contact with and joined to the side face 130 of the column side fire-resistant base material 122.

[0041] [Effect] Next, the operation of this embodiment will be described.

[0042] In the event of a fire, the column-side wood fire-resistant covering material 124 of the column-side fire-resistant covering material 120 and the beam-side wood fire-resistant covering material 154 of the beam-side fire-resistant covering material 150 burn and carbonize, thereby functioning as a heat insulating layer. Therefore, the fire resistance performance of the steel column 20 and the steel beam 50 is improved compared to when the column-side wood fire-resistant covering material 124 and the beam-side wood fire-resistant covering material 154 are not present.

[0043] In addition, even if a gap occurs at the joint section 11 between the column-side wood fire-resistant coating material 124 and the beam-side wood fire-resistant coating material 154 during a fire or if part of the joint opens or is burned, fire resistance is ensured by the non-combustible column-side fire-resistant base material 122 and the non-combustible beam-side fire-resistant base material 152.

[0044] In the joint 11, the non-combustible column-side fire-resistant base material 122 and the non-combustible beam-side fire-resistant base material 152 are always in contact with each other, with no non-contacting portions, i.e., no gaps between them. This prevents the deterioration of fire resistance caused by gaps arising from opening or partial burnout of the joint between the column-side wood fire-resistant covering material 124 and the beam-side wood fire-resistant covering material 154.

[0045] In addition, in the joint section 11, an end face 132 of the beam-side fire-resistant base material 152 made of gypsum board and having a small coefficient of linear thermal expansion is in contact with a side face 130 of the column-side fire-resistant base material 122 made of metal plate 121 and having a large coefficient of linear thermal expansion. Therefore, even if the column-side fire-resistant base material 122 made of metal plate 121 thermally expands and stretches due to the heat of a fire, the beam-side fire-resistant base material 152 made of gypsum board 151 is not damaged, and a decrease in fire resistance is prevented or suppressed.

[0046] (First Comparative Example) Here, a first comparative example shown in FIG. 11 will be described, in which there is a portion in the joint portion 11 where the non-combustible column-side fire-resistant base material 122 and the beam-side fire-resistant base material 152 are not in contact with each other.

[0047] 11, the end face 132 of the beam-side fire-resistant base material 152 is in contact with the side face 126 of the column-side wooden fire-resistant coating material 124. Therefore, when the contact area between the side face 126 of the column-side wooden fire-resistant coating material 124 and the end face 132 of the beam-side fire-resistant base material 152 burns and is burned away, a gap is generated in the fire-resistant coating (see part S), and the fire resistance performance is significantly reduced.

[0048] 1, 2 and 10, the non-combustible column-side fire-resistant base material 122 and beam-side fire-resistant base material 152 are in contact with each other as described above. Therefore, even if the column-side wood fire-resistant covering material 124 and the beam-side wood fire-resistant covering material 154 are burned down, no gaps are generated in the fire-resistant covering, so that the deterioration of fire resistance is suppressed.

[0049] (Second Comparative Example) Next, we will explain the second comparative example shown in Figure 12, in which, at the joint section 11, the end face 232 of the column-side fire-resistant base material 122, which is made of a metal plate and has a large coefficient of linear thermal expansion, is in contact with the side of the beam-side fire-resistant base material 152, which is made of gypsum board and has a small coefficient of linear thermal expansion.

[0050] In the second comparative example of Figure 12, when the column-side fire-resistant base material 122 made of a metal plate stretches due to the heat of a fire, the beam-side fire-resistant base material 152 made of gypsum board 151 is pushed and damaged (see part H), which may result in a decrease in fire resistance.

[0051] 1, 2 and 10, as described above, the end face 132 of the beam-side fire-resistant base material 152 made of gypsum board and having a small coefficient of linear thermal expansion is in contact with the side surface 130 of the column-side fire-resistant base material 122 made of a metal plate and having a large coefficient of linear thermal expansion. Therefore, even if the column-side fire-resistant base material 122 made of a metal plate stretches due to the heat of a fire, the beam-side fire-resistant base material 152 made of gypsum board 151 is not damaged, and thus a decrease in fire resistance is prevented or suppressed.

[0052] [Variations] Next, a modification of this embodiment will be described.

[0053] In the modification shown in Fig. 4, the beam-side fire-resistant base material 152 of the beam-side fire-resistant covering material 150 has openings 117A, 117B, 117C, and 117D formed in the portions that interfere with the steel beam 50, similar to the column-side wood fire-resistant covering material 124. In other words, the end face 232 of the upper end of the beam-side fire-resistant base material 152 is located below the lower flange 54, as shown in Fig. 3.

[0054] Therefore, an upper portion 139, which is a portion other than the opening 119 at the joint portion 11 of the column-side wood fire-resistant coating material 124 in FIG. 2, is not shown in FIG.

[0055] Second Embodiment Next, a second embodiment will be described. Note that the same members as those in the first embodiment are given the same reference numerals, and duplicated descriptions will be omitted or simplified.

[0056] [composition] First, the configuration of a fire-resistant covered structure 104 of this embodiment at a joint portion where a fire-resistant covered steel column and a fire-resistant covered steel beam are joined will be described.

[0057] FIG. 5 shows a vertical cross section of a joint 11 where a fire-resistant coated steel column 20 is joined to fire-resistant coated steel beams 50A, 50B, 50C, and 50D (see FIG. 6), and FIG. 6 shows a horizontal cross section.

[0058] 5 and 6, a column-side fire-resistant covering material 120 is provided around the steel column 20. The column-side fire-resistant covering material 120 has the same structure as that of the first embodiment except for the main parts described later, and therefore the description thereof will be omitted.

[0059] 5 and 6, a beam-side fire-resistant covering material 250 is provided on the upper side of each steel beam 50, i.e., on the periphery excluding the slab 15 side. The beam-side fire-resistant covering material 250 is configured by laminating a non-combustible beam-side fire-resistant base material 252 having a U-shaped vertical cross section perpendicular to the beam direction and a U-shaped beam-side wood fire-resistant covering material 154. The beam-side fire-resistant base material 252 in this embodiment is configured of flexible glass wool 251.

[0060] The beam-side wood fire-resistant covering material 154 is similar to that in the first embodiment, and therefore a description thereof will be omitted. Although not shown, the beam-side fire-resistant covering material 250 is wrapped around the steel beam 50 and fixed with a heat-resistant adhesive or the like. Thus, the beam-side fire-resistant covering material 250 is in contact with the steel beam 50. The beam-side wood fire-resistant covering material 154 is also fixed with a fixing bracket 190 joined to the steel beam 50 with a screw 192 (see FIG. 9). The screw 192 penetrates the beam-side fire-resistant covering material 250.

[0061] (Fit of fireproof coating material at joints) Next, the fit of the column-side fire-resistant covering material 120 and the beam-side fire-resistant covering material 250 at the joint portion 11, which is the main part of the invention, will be explained.

[0062] As shown in Figures 5 and 6, in the joint section 11, the end faces 156A, 156B, 156C, and 156D of the beam side wood fire-resistant coating materials 154A, 154B, 154C, and 154D of each beam side fire-resistant coating material 150A, 150B, 150C, and 150D are in contact with the side surface 126 of the column side wood fire-resistant coating material 124 of the column side fire-resistant coating material 120.

[0063] Furthermore, at the joint portion 11, the end faces 232 of the column side fire-resistant base material 122 of the column side fire-resistant coating material 120 are in contact with and joined to the side surfaces 230A, 230B, 230C, 230D of the beam side fire-resistant base materials 252A, 252B, 252C, 252D of each beam side fire-resistant coating material 250A, 250B, 250C, 250D.

[0064] In this way, in the joint section 11, the end face 232 of the column-side fire-resistant base material 122 contacts and is joined to the side face 230 of the beam-side fire-resistant base material 252 within the space surrounded by the column-side wood fire-resistant base material 124 of the column-side fire-resistant base material 120 and the beam-side wood fire-resistant base material 154 of the beam-side fire-resistant base material 150. In other words, in the joint section 11, the non-combustible column-side fire-resistant base material 122 and the non-combustible beam-side fire-resistant base material 252 are always in contact with each other, and there is no non-contact portion, that is, there is no gap between them.

[0065] In addition, slits 218A, 218B, 218C, and 218D are formed in the beam side fire-resistant base material 252 of the beam side fire-resistant covering material 250 so as not to interfere with the lower flange 54 and web 56 of the steel beam 50.

[0066] [Effect] Next, the operation of this embodiment will be described.

[0067] In the event of a fire, the column-side wood fire-resistant covering material 124 of the column-side fire-resistant covering material 120 and the beam-side wood fire-resistant covering material 154 of the beam-side fire-resistant covering material 150 burn and carbonize, thereby functioning as a heat insulating layer. Therefore, the fire resistance performance of the steel column 20 and the steel beam 50 is improved compared to when the column-side wood fire-resistant covering material 124 and the beam-side wood fire-resistant covering material 154 are not present.

[0068] In addition, in the joint 11, the non-combustible column-side fire-resistant base material 122 and the non-combustible beam-side fire-resistant base material 252 are always in contact with each other, with no non-contacting portions, i.e., no gaps between them. This prevents the deterioration of fire resistance caused by gaps arising from opening or partial burnout of the joint between the column-side wood fire-resistant covering material 124 and the beam-side wood fire-resistant covering material 154.

[0069] Furthermore, the end face 232 of the column side fireproof base material 122 made of metal plate 121 and having a large coefficient of linear thermal expansion is in contact with the side surface 230 of the beam side fireproof base material 252 made of flexible glass wool 251. Therefore, even if the column side fireproof base material 122 made of metal plate 121 thermally expands and stretches due to the heat of a fire, the beam side fireproof base material 252, made of flexible glass wool 251, easily follows and deforms (compresses in this example) and is not damaged. This prevents or suppresses a decrease in fire resistance.

[0070] <Third embodiment> Next, a third embodiment will be described. Note that the same members as those in the first embodiment are given the same reference numerals, and duplicated descriptions will be omitted or simplified.

[0071] [composition] First, the configuration of the fire-resistant covered structure 106 of this embodiment at a joint portion where a fire-resistant covered steel column and a fire-resistant covered steel beam are joined will be described.

[0072] FIG. 7 shows a vertical cross section of a joint 11 at which a fire-resistant coated steel column 20 and fire-resistant coated steel beams 50A, 50B, 50C, and 50D are joined.

[0073] As shown in Fig. 7, a column-side fire-resistant covering material 120 is provided around a steel column 20. The column-side fire-resistant covering material 120 has the same structure as that of the first embodiment except for the main parts described later, and therefore the description thereof will be omitted.

[0074] A beam-side fire-resistant covering material 150 is provided on the upper side of each steel beam 50A, 50B, 50C, and 50D, i.e., on the periphery except for the side of the slab 15. Note that the beam-side fire-resistant covering material 150 has the same structure as that of the first embodiment except for the main parts described later, and therefore the description thereof will be omitted.

[0075] The outer periphery of the joint 11 is made up of a non-combustible joint-side fire-resistant member 300. In this embodiment, the joint-side fire-resistant member 300 is constructed by pouring concrete around the joint 11. From another perspective, this embodiment has a structure in which the joint portion between the steel column 20 and the steel beam 50 is embedded in the joint-side fire-resistant member 300 made of concrete.

[0076] The configuration in which the outer periphery of the joint portion 11 is made of the noncombustible joint-side fire-resistant member 300 is merely an example and is not limited thereto. For example, the joint portion between the steel column 20 and the steel beam 50 may be surrounded by gypsum board or covered with glass wool 251. A column-side fire-resistant covering material 120 is provided around the steel column 20, and a beam-side fire-resistant covering material 150 is provided around the steel beam 50. The column-side fire-resistant covering material 120 and the beam-side fire-resistant covering material 150 have the same structure as in the first embodiment except for the main parts described later, and therefore description thereof will be omitted.

[0077] (Fit of fireproof coating material at joints) Next, the fit of the column-side fire-resistant covering material 120 and the beam-side fire-resistant covering material 150 in the joint portion 11, which is the main part of the invention, will be explained.

[0078] 7, in the joint section 11, an end face of the column-side wood fire-resistant covering material 124 of the column-side fire-resistant covering material 120 contacts the peripheral face 302 of the joint-side fire-resistant member 300. Also, an end face 156 of the beam-side wood fire-resistant covering material 154 of each beam-side fire-resistant covering material 150 contacts the peripheral face 302 of the joint-side fire-resistant member 300 or the side face 126 of the column-side wood fire-resistant covering material 124.

[0079] Furthermore, in the joint section 11, the end face 232 of the column side fireproof base material 122 of the column side fireproof covering material 120 and the end face 132 of the beam side fireproof base material 152 of each beam side fireproof covering material 150 contact the peripheral face 302 of the joint side fireproof member 300. In other words, in the joint section 11, the non-combustible column side fireproof base material 122 and the non-combustible beam side fireproof base material 152 always contact the joint side fireproof member 300, and there is no non-contact portion, that is, there is no gap between them. Note that, if there is a gap between the end face 232 of the column side fireproof base material 122 and the end face 132 of the beam side fireproof base material 152 and the peripheral face 302 of the joint side fireproof member 300, it is filled with the same material.

[0080] [Effect] Next, the operation of this embodiment will be described.

[0081] In the event of a fire, the column-side wood fire-resistant covering material 124 of the column-side fire-resistant covering material 120 and the beam-side wood fire-resistant covering material 154 of the beam-side fire-resistant covering material 150 burn and carbonize, thereby functioning as a heat insulating layer. Therefore, the fire resistance performance of the steel column 20 and the steel beam 50 is improved compared to when the column-side wood fire-resistant covering material 124 and the beam-side wood fire-resistant covering material 154 are not present.

[0082] In addition, in the joint 11, the non-combustible column-side fire-resistant base material 122 and the non-combustible beam-side fire-resistant base material 152 are always in contact with the peripheral surface 302 of the non-combustible joint-side fire-resistant component 300, and there are no non-contacting portions, that is, there are no gaps between them. Therefore, the deterioration of fire resistance caused by gaps occurring due to opening or partial burnout of the joint portion between the column-side wood fire-resistant covering material 124 and the beam-side wood fire-resistant covering material 154 is suppressed.

[0083] <Other> The present invention is not limited to the above embodiment.

[0084] For example, in the above embodiment, the column side fire-resistant base material 122 is composed of the metal plate 121, but is not limited to this. The column side fire-resistant base material 122 may be, for example, a gypsum board, glass wool, rock wool, calcium silicate board, AES wool, or the like.

[0085] In addition, for example, in the above embodiment, the beam side fireproof base material 152 is the gypsum board 151 or the glass wool 251, but is not limited thereto. The beam side fireproof base material 152 may be a metal plate, glass wool, rock wool, calcium silicate board, AES wool, or the like.

[0086] In addition, for example, in the above embodiment, the column side fire-resistant covering material 120 is composed of the column side fire-resistant base material 122 and the column side wood fire-resistant covering material 124, and the beam side fire-resistant covering material 150 is composed of the beam side fire-resistant base material 152 and the beam side wood fire-resistant covering material 154, but this is not limited thereto. Either the column side wood fire-resistant covering material 124 or the beam side wood fire-resistant covering material 154 may be omitted.

[0087] In the first embodiment, the end face of the beam-side fireproof base material having a small thermal expansion coefficient is in contact with the side face of the column-side fireproof base material having a large thermal expansion coefficient, but the present invention is not limited to this. The end face of the column-side fireproof base material having a small thermal expansion coefficient may be in contact with the side face of the beam-side fireproof base material having a large thermal expansion coefficient.

[0088] In the second embodiment, the end face of the column side fireproof base material is in contact with the side face of the beam side fireproof base material having flexibility, but this is not limited to this. The end face of the beam side fireproof base material may be in contact with the side face of the column side fireproof base material having flexibility. In addition to the glass wool 251, examples of flexible non-combustible fireproof base materials include rock wool and AES wool.

[0089] In addition, for example, in the above embodiment, the steel column 20 is a square steel pipe, but is not limited to this. The steel column may be, for example, a round steel pipe, an H-shaped steel pipe, a concrete-filled steel pipe, or the like.

[0090] The present invention can be embodied in various forms without departing from the spirit and scope of the present invention. A plurality of embodiments and modifications can be implemented in appropriate combination. [Explanation of symbols]

[0091] 11 Joint 20 Steel column 50A Steel beam 50B Steel beam 50C Steel beam 50D Steel Beam 100 Fire-resistant coating structure 104 Fire-resistant covering structure 106 Fire-resistant covering structure 120 Column side fireproof covering material 122 Pillar side fireproofing material 124 Wooden fireproof coating on column side 126 Side 130 Side 132A End face 132B End face 132C End face 132D end face 150A Beam side fireproof covering material 150B Beam side fireproof covering material 150C Beam side fireproof covering material 150D beam side fireproof cladding 152A Beam side wood fireproof covering material 152B Beam side wood fireproof covering material 152C Beam side wooden fire-resistant covering material 152D Beam side wooden fire-resistant covering material 154A Beam side wooden fire resistant covering material 154B Beam side wooden fire-resistant covering material 154C Beam side wooden fire-resistant covering material 154D Beam side wooden fire-resistant covering material 156A End Face 156B End face 156C End face 156D End Face 230A Side 230B Side 230C Side 230D Side 232 End face 250A beam side fire resistant covering material 250C Beam side fire resistant covering material 300 Socket side refractory parts

Claims

1. A fire-resistant coating structure for a joint between a fire-resistant coated steel column and a fire-resistant coated steel beam, A column side fireproof base material is provided around the steel column, A beam-side fireproof base material is provided around the steel beam, A wood fire-resistant covering material is provided around at least one of the column side fire-resistant base material and the beam side fire-resistant base material, In the connection portion, The column side fireproof base material and the beam side fireproof base material are in contact with each other. Fire-resistant coated construction.

2. The column side fireproof base material and the beam side fireproof base material have a large thermal expansion coefficient, and the other end face having a small thermal expansion coefficient is in contact with the side face having a large thermal expansion coefficient. The fire-resistant coated structure of claim 1.

3. The other end surface is in contact with one side surface having flexibility in the column side fireproof base material and the beam side fireproof base material, The fire-resistant coated structure of claim 1.

4. A fire-resistant coating structure for a joint between a fire-resistant coated steel column and a fire-resistant coated steel beam, A column side fireproof base material is provided around the steel column, A beam-side fireproof base material is provided around the steel beam, A wood fire-resistant covering material is provided around at least one of the column side fire-resistant base material and the beam side fire-resistant base material, The outer periphery of the joint is composed of a joint side fireproof material, In the connection portion, The column side fireproof base material and the beam side fireproof base material are in contact with the joint side fireproof member, Fire-resistant coated construction.

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