Fireproof structure and method for constructing fireproof structure

Abstract

To provide a fireproof structure having high workability and a method for constructing the fireproof structure.SOLUTION: A fireproof structure 30 has a steel material 31, an air layer 32 surrounding the steel material 31, a woody fireproof covering material 33 surrounding the air layer 32, and a connecting material 34 connecting the steel material 31 and the woody fireproof covering material 33 in the air layer 32. The woody fireproof covering material 33 is formed of a plurality of wood plate parts arranged to surround the steel material 31 and joined to each other. The connecting material 34 has a steel material-side connecting part 55 fixed to the steel material 31 and a woody fireproof covering material-side connecting part 60 fixed to the woody fireproof covering material 33. In the connecting material 34, the steel material-side connecting part 55 and the woody fireproof covering material-side connecting part 60 are engaged.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fire-resistant structure in which a wood-based fire-resistant covering material is disposed so as to surround a steel material, and a method for constructing the fire-resistant structure. [Background technology]

[0002] As an example of a fire-resistant structure in which a wood-based fire-resistant covering material is arranged to surround a steel material, Patent Document 1 discloses a fire-resistant structure in which a pair of half-split wood pieces are fitted to surround a steel pipe surrounded by a damage suppression material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-56202 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the fire-resistant structure of Patent Document 1, since it is difficult to fit half-split wood pieces into steel pipes at the construction site, the finished product had to be transported to the construction site, leaving room for improvement in terms of workability. [Means for solving the problem]

[0005] A fireproof structure that solves the above problem includes a steel material, an air space surrounding the steel material, and a wood fireproof covering material surrounding the air space, and the air space includes a connecting material that connects the steel material and the wood fireproof covering material, and the wood fireproof covering material is formed by joining a plurality of wood boards arranged to surround the steel material, and the connecting material has a steel-side connecting part fixed to the steel material and a wood fireproof covering material-side connecting part fixed to the wood board, and the steel-side connecting part and the wood fireproof covering material-side connecting part are engaged with each other. This configuration can improve the workability of the fireproof structure.

[0006] A construction method for a fire-resistant structure that solves the above-mentioned problems is a construction method for a fire-resistant structure having steel, an air layer surrounding the steel, a wood fire-resistant covering material surrounding the air layer, and a connecting material that connects the steel and the wood fire-resistant covering material at the air layer, wherein the wood fire-resistant covering material is formed by joining a plurality of wood board sections arranged to surround the air layer, and the connecting material has a steel-side connecting part fixed to the steel, and a wood fire-resistant covering material-side connecting part fixed to the wood board section, and the construction method includes the steps of: producing a steel-side connection part fixing unit in which the steel and the steel-side connection part are fixed in advance; producing a wood fire-resistant covering material-side connection part fixing unit in which the wood board section and the wood fire-resistant covering material-side connection part are fixed in advance; and engaging the steel-side connection part fixing unit and the wood fire-resistant covering material-side connection part fixing unit at a construction site.

[0007] A method for constructing a fire-resistant structure that solves the above-mentioned problems is a method for constructing a fire-resistant structure having a steel material, an air space surrounding the steel material, a wood fire-resistant covering material surrounding the air space, and a connecting material that connects the steel material and the wood fire-resistant covering material at the air space, wherein the wood fire-resistant covering material is formed by joining a plurality of wood boards arranged to surround the air space, and the connecting material has a steel-side connecting part fixed to the steel material, and a wood fire-resistant covering material-side connecting part fixed to the wood boards and engaged so as to be movable relative to the steel-side connecting part in an opposing direction in which the steel material and the wood boards face each other, and In the above, when the wooden board portion facing the steel in the opposing direction is referred to as the opposing wooden board portion, and the wooden board portion adjacent to the opposing wooden board portion is referred to as the adjacent wooden board portion, a flame penetration prevention corner that closes the inner corner formed by joining with the opposing wooden board portion is fixed to the adjacent wooden board portion, and with the steel side connecting portion and the wood fire-resistant coating material side connecting portion engaged for the adjacent wooden board portion and the opposing wooden board portion, the opposing wooden board portion is fixed to the flame penetration prevention corner and joined to the adjacent wooden board portion while being brought close to the steel in the opposing direction.

[0008] A method for constructing a fire-resistant structure that solves the above-mentioned problems is a method for constructing a fire-resistant structure having a steel material, an air space surrounding the steel material, a wood fire-resistant covering material surrounding the air space, and a connecting material that connects the steel material and the wood fire-resistant covering material in the air space, wherein the wood fire-resistant covering material is formed into a hollow rectangular prism shape by joining a plurality of wood board sections arranged to surround the air space, and the connecting material has a steel-side connecting part fixed to the steel material, and a wood fire-resistant covering material-side connecting part fixed to the wood board sections and engaging with the steel-side connecting part, and the fire-resistant structure further has flame penetration prevention corners fixed to adjacent wood board sections and closing inner corners formed by the adjacent wood board sections, and a first L-shaped unit formed by joining two adjacent wood board sections The first L-shaped unit and the second L-shaped unit are fabricated in advance, and the fire prevention corners include a first fire prevention corner fixed to the two wooden board portions and a second fire prevention corner provided on one of the two wooden board portions and fixed to the wooden board portion of the other L-shaped unit.At a construction site, the connecting materials are engaged for both the first L-shaped unit and the second L-shaped unit, and then the second fire prevention corner of the first L-shaped unit is fixed to the wooden board portion of the second L-shaped unit, the second fire prevention corner of the second L-shaped unit is fixed to the wooden board portion of the second L-shaped unit, and the wooden board portion of the first L-shaped unit is joined to the wooden board portion of the second L-shaped unit.

[0009] A method for constructing a fire-resistant structure that solves the above-mentioned problems is a method for constructing a fire-resistant structure having steel material, an air space surrounding the steel material, a wood fire-resistant covering material surrounding the air space, and a connecting material that connects the steel material and the wood fire-resistant covering material at the air space, wherein the wood fire-resistant covering material is formed into a hollow rectangular prism shape by joining a plurality of wood board parts that are arranged to surround the air space, and the connecting material has a steel-side connecting part fixed to the steel material, and a wood fire-resistant covering material-side connecting part that is fixed to the wood board part and engages with the steel-side connecting part, and the fire-resistant structure is a method for constructing a fire-resistant structure having steel material, an air space surrounding the steel material, a wood fire-resistant covering material surrounding the air space, and a connecting material that connects the steel material and the wood fire-resistant covering material at the air space. a channel-type unit having adjacent wood board portions joined together and fixed at the flame penetration prevention corners, and a channel-type unit having adjacent wood board portions joined together and fixed at the flame penetration prevention corners is fabricated in advance, and at a construction site, the channel-type unit and the remaining wood board portions are engaged with the connecting members, and then the wood board portions of the channel-type unit are fixed to the remaining wood board portions using the flame penetration prevention corners, and the wood board portions of the channel-type unit are joined to the remaining wood board portions.

[0010] According to the above-described fire-resistant structure and the method for constructing the fire-resistant structure, the ease of construction of the fire-resistant structure can be improved. The fire-resistant structure may have a fire-resistant material provided on the air layer side of the wood-based fire-resistant covering material, and the wood-based fire-resistant covering material side connection part may be fixed to the fire-resistant material and the wood board part. With this configuration, the fire resistance of the fire-resistant structure can be improved.

[0011] In the above fire-resistant structure, the connecting member may have a rod fixed to one of the steel-side connecting portion or the wood fire-resistant covering material-side connecting portion, and a loose hole provided in the other of the steel-side connecting portion or the wood fire-resistant covering material-side connecting portion, with which the rod engages and which allows the steel-side connecting portion and the wood fire-resistant covering material-side connecting portion to move relatively. With this configuration, the positions of the steel-side connecting portion and the wood fire-resistant covering material-side connecting portion can be adjusted.

[0012] In the above fire-resistant structure, the direction in which the relative movement is possible is preferably the direction in which the steel material and the wooden board part face each other. With this configuration, the positions of the steel material side connection part and the wooden fire-resistant covering material side connection part can be adjusted in the facing direction.

[0013] In the above fireproof structure, the direction in which the relative movement is possible is preferably a perpendicular direction perpendicular to the opposing direction in which the steel material and the wooden board part face each other. With this configuration, the positions of the steel material side connection part and the wooden fireproof covering material side connection part can be adjusted in the perpendicular direction.

[0014] In the above fire-resistant structure, the direction in which the relative movement is possible is preferably the axial direction of the steel material. With this configuration, the positions of the steel-material-side connection part and the wood-based fire-resistant covering material-side connection part can be adjusted in the axial direction of the steel material.

[0015] The fireproof structure may have a concrete material inside the steel material, and the steel material and the concrete material may form a steel pipe concrete structure. With this configuration, a part of the heat received by the steel material can be transferred to the concrete material. This improves the fireproof property of the steel material.

[0016] In the above fire-resistant structure, it is preferable that the wooden fire-resistant covering material side connection part is fixed to the wooden board part via a base material, and the steel material side connection part and the wooden fire-resistant covering material side connection part are engaged with each other at the upper part of the steel material. With this configuration, the weight of the wooden fire-resistant covering material can be distributed and transmitted to the wooden fire-resistant covering material side connection part.

[0017] In the above fireproof structure, it is preferable that the base material is fixed to the wooden board portion at a plurality of points. With such a configuration, the fireproof material can be supported at many points, and the fireproof material can be prevented from falling off.

[0018] In the construction method for the fire-resistant structure having the above-mentioned configuration, it is preferable that the adjacent wooden boards are joined with the end face of the losing wooden board abutting the side of the winning wooden board, and the flame penetration prevention corner is pre-fixed to the end of the losing wooden board so as to be flush with the end face. With this configuration, it is easy to align the flame penetration prevention corner when fixing it to the losing wooden board.

[0019] In the construction method for a fireproof structure having the above-mentioned configuration, the wooden board section is provided with a fireproof material facing the air layer side, the wooden fireproof covering material side connection section is fixed to the fireproof material and the wooden board section, and further has a flame penetration prevention corner that is fixed to the adjacent wooden board section and closes the inner corner formed by the adjacent wooden board section, and the fireproof material is preferably such that the small end surface of the fireproof material on the losing side abuts against the side surface of the fireproof material on the winning side at the inner corner of the adjacent wooden board section, and the flame penetration prevention corner is pre-fixed to the end of the fireproof material on the losing side so as to be flush with the small end surface. With this configuration, it is easy to align the flame penetration prevention corner when fixing it to the fireproof material on the losing side. [Brief description of the drawings]

[0020] [Figure 1] 1 is a diagram showing a schematic configuration of a fireproof structure having an embodiment of a fireproof structure. FIG. [Diagram 2] FIG. 2(a) is a schematic diagram showing a cross section of a fireproof structure, and FIG. 2(b) is an enlarged view of a portion surrounded by line 2b. [Diagram 3] FIG. 2 is a perspective view showing a schematic view of an upper part of a steel material. [Figure 4] 1 is an oblique view showing a schematic view of a fixing unit for a connection portion on the first wood fire-resistant covering material side. FIG. [Diagram 5] FIG. 13 is a diagram showing a schematic diagram of an example of a construction method for a fire-resistant structure, illustrating how one of the first wood fire-resistant covering material side connection portion fixing units is connected to a steel material. [Figure 6] 13 is a diagram showing a schematic diagram of the steel material side connection part and the wood fire-resistant covering material side connection part engaging with each other. FIG. [Figure 7] This is a view from above of the steel material side connection part and the wood fire-resistant covering material side connection part in an engaged state. [Figure 8] 13 is a diagram showing a schematic diagram of one of the second wood fire-resistant covering material side connection portion fixing units being connected to a steel material. FIG. [Figure 9] 13 is a diagram showing a schematic diagram of the state in which the other first wood fire-resistant covering material side connection portion fixing unit is connected to the steel material. FIG. [Figure 10] FIG. 2 is a diagram showing a schematic diagram of a state in which gaps in a wooden board are thermally decomposed. [Figure 11] FIG. 10 is a diagram showing a schematic diagram of an example of a construction method for a fire-resistant structure in a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The fireproof structure and the method of constructing the fireproof structure will be described with reference to Figs. 1, the standing structure 10 has a lower structure 11, an upper structure 12, and a fireproof structure 30. In this embodiment, the fireproof structure 30 is a column having a rectangular prism-shaped appearance and installed to connect the lower structure 11 and the upper structure 12.

[0022] The lower structure 11 is composed of, for example, a joint member 13, a beam 14, and a slab 15. The joint member 13 is a member that connects the beam 14 to the fireproof structure 30. The beam 14 is formed by using, for example, H-shaped steel. The slab 15 is formed by, for example, concrete.

[0023] The upper structure 12 is composed of, for example, joint members 17, beams 18, slabs (not shown), and the like, similar to the lower structure 11. The joint members 17 are members that connect the beams 18 and the fireproof structure 30. The beams 18 are formed, for example, using H-shaped steel.

[0024] (Fireproof structure) The fire-resistant structure 30 includes steel material 31, an air layer 32, a wood-based fire-resistant covering material 33, connecting materials 34, and pillow materials 35.

[0025] The steel material 31 is, for example, a steel pipe material having a rectangular cross section and a length direction in the axial direction of the fireproof structure 30. When the steel material 31 is a steel pipe material, a concrete material may be formed inside the steel material 31 to form a steel pipe concrete structure. The air layer 32 is formed so as to surround the steel material 31. The wood fireproof coating material 33 is formed in a hollow rectangular column shape that surrounds the air layer 32 and contains the steel material 31. The connection material 34 connects the steel material 31 and the wood fireproof coating material 33 in the air layer 32. The connection material 34 is composed of a steel material side connection part 55 provided on the steel material 31 side and a wood fireproof coating material side connection part 60 provided on the wood fireproof coating material 33 side. The steel material side connection part 55 and the wood fireproof coating material side connection part 60 are engaged at the upper end of the fireproof structure 30 and also function as a spacer at the upper end of the fireproof structure 30. The bolster material 35 acts as a spacer at the lower end of the fire resistant structure 30 .

[0026] (Wood fireproof covering material) As shown in Figs. 2(a) and 2(b), the wood fire-resistant covering material 33 is made up of a number of wood boards 41 joined together.

[0027] The wooden boards 41 are finishing materials that constitute the side portions of the wooden fireproof covering material 33. The wooden boards 41 are boards whose length direction is orthogonal to the paper surface, i.e., the axial direction of the fireproof structure 30. The wooden boards 41 are formed, for example, from CLT (Cross Laminated Timber). The wooden boards 41 are provided so that their peripheries are continuous. Each wooden board 41 forms each corner of the wooden fireproof covering material 33 that has a hollow rectangular column shape together with the adjacent wooden boards 41. The wooden boards 41 may be made of laminated lumber, lumber, plywood, etc., in addition to CLT. Since the wooden boards 41 are fireproof covering materials, there is no need to ensure structural performance. For this reason, materials other than JAS (Japanese Agricultural Standard) certified materials, for example, CLT materials of 2 ply or less, can be used. As a result, it is possible to reduce production costs and promote the use of wood.

[0028] In the following description, the losing side wooden board part 41 facing the left-right direction of the paper is referred to as the first wooden board part 41A, and the winning side wooden board part 41 facing the top-bottom direction of the paper is referred to as the second wooden board part 41B. When there is no need to distinguish between the first wooden board part 41A and the second wooden board part 41B, they are simply referred to as the wooden board part 41.

[0029] The first wooden board 41A and the second wooden board 41B are joined by a board joint material 45. The board joint material 45 is, for example, a screw. The board joint material 45 is inserted into a board joint edge 46 formed in the second wooden board 41B, and then driven into the first wooden board 41A so as to penetrate the second wooden board 41B. After the wooden boards 41A and 41B are joined, a filler wood 47 is placed in the board joint edge 46 so as to cover and hide the board joint material 45. The filler wood 47 functions as a part of the wood fire-resistant covering material 33.

[0030] The fire-resistant structure 30 also includes fire-resistant material 42 and fire-penetration prevention corners 43 . The fireproof material 42 is joined to the inner surface of each wooden board 41 so as to face the air layer 32. The fireproof material 42 is provided so as to be continuous at the inner corner formed by the adjacent wooden boards 41. More specifically, the first wooden board 41A is provided with the losing fireproof material 42, and the second wooden board 41B is provided with the winning fireproof material 42. The fireproof material 42 is composed of, for example, gypsum board, reinforced gypsum board, fireproof paint, fireproof spray material, etc. When the fireproof material 42 is gypsum board or reinforced gypsum board, the fireproof material 42 may be joined to the wooden board 41 by a screw (not shown) or the like, or may be joined by an adhesive. By joining the fireproof material 42 to the wooden board 41 by an adhesive, the wooden board 41 is easily peeled off from the fireproof material 42 during burning. This makes it possible to suppress the thermal effect from the wooden board 41 to the fireproof material 42.

[0031] The flame penetration prevention corners 43 are provided at each of the inner corners formed by the adjacent fireproof materials 42. The flame penetration prevention corners 43 extend in the axial direction (perpendicular to the paper surface) of the fireproof structure 30 along each inner corner, and close the gaps between the adjacent fireproof materials 42. The flame penetration prevention corners 43 are provided so as to be flush with the small end surface of the fireproof material 42 on the losing side. This makes it easy to align the fireproof material 42 with the flame penetration prevention corners 43 when the flame penetration prevention corners 43 are fixed in advance to the wooden board part 41 having the fireproof material 42 on the losing side. The flame penetration prevention corners 43 are formed of a material that is less flammable than the wooden board part 41, such as a high heat capacity material (iron material such as steel pipes and angle bars, mortar bars, etc.), a non-combustible material (calcium silicate material), or wood with a high specific gravity. In this embodiment, the flame penetration prevention corners 43 are angle bars.

[0032] The fire penetration prevention corner 43 is joined to the first wooden board part 41A and the fire-resistant material 42 attached to the first wooden board part 41A by a joining material 51. The joining material 51 is, for example, a screw. The joining material 51 is driven into the first wooden board part 41A from the side of the fire penetration prevention corner 43 so as to penetrate the fire penetration prevention corner 43 and the fire-resistant material 42.

[0033] The fire-penetration prevention corner 43 is fixed to the second wooden board 41B and the fire-resistant material 42 attached to the second wooden board 41B by a fixing material 52. The fixing material 52 is, for example, a screw. The fixing material 52 is inserted into a fixing edge 53 formed in the second wooden board 41B, and then driven into the fire-penetration prevention corner 43 so as to penetrate the second wooden board 41B and the fire-resistant material 42. As a result, the fire-penetration prevention corner 43 is provided so as to press the joints of the adjacent fire-resistant materials 42 and to close the joints of the adjacent fire-resistant materials 42. After fixing with the fixing material 52, a filler wood 54 is disposed in the fixing edge 53 so as to cover the fixing material 52. The filler wood 54 functions as a part of the wood fire-resistant covering material 33.

[0034] (Connecting material) As shown in FIG. 3, the steel-side connection part 55 constituting the connection material 34 is provided on the steel material 31. The steel-side connection part 55 is provided at one end of the steel material 31 in the center of each side part. The steel-side connection part 55 has an angle material 56 and a bar material 57. The angle material 56 and the bar material 57 are made of metal. The angle material 56 has a joint side part joined to the steel material 31 by welding, and a protruding side part protruding toward the wood fire-resistant covering material 33. The bar material 57 is joined to the center of the protruding side part of the angle material 56 by welding. The bar material 57 extends upward from the protruding side part of the angle material 56.

[0035] Next, a description will be given of the wood fire-resistant covering material side connection part 60 constituting the connection material 34. The wood fire-resistant covering material side connection part 60 is provided with the same structure for each of the first wood board part 41A and the second wood board part 41B. Here, the wood fire-resistant covering material side connection part 60 will be described using the first wood board part 41A.

[0036] As shown in FIG. 4, the wooden fire-resistant covering material side connection part 60 is fixed to the first wooden board part 41A and the fire-resistant material 42 via a base material 61. The base material 61 has a pair of side frame portions 62, a lower frame portion 63, and a middle frame portion 64. The pair of side frame portions 62 extend on both sides of the widthwise center of the first wood board portion 41A in the axial direction of the fireproof structural body 30. The lower frame portion 63 connects the other ends of the pair of side frame portions 62. The middle frame portion 64 connects the middle portions of the pair of side frame portions 62.

[0037] The base material 61 is composed of metal angle members joined together by welding. The angle members have fixed sides that are fixed to the first wooden board portion 41A and the fireproof material 42 at multiple points by base fixing members 65 such as screws, and protruding sides that protrude toward the steel material 31.

[0038] The wooden fire-resistant covering material side connection part 60 is composed of a metal angle bar. This angle bar has a joint side part joined to a pair of side frame parts 62 and a protruding side part protruding toward the steel material 31. The wooden fire-resistant covering material side connection part 60 is joined at the upper end part of each side frame part 62 to the fixed side part of the angle bar constituting the side frame part 62 by welding. The wooden fire-resistant covering material side connection part 60 is fixed to the first wooden board part 41A and the fire-resistant material 42 in a state where it is joined to the base material 61.

[0039] The wood fire-resistant covering material side connection part 60 has a loose hole 68 in the center of the protruding edge part into which the rod 57 of the steel material side connection part 55 can be inserted. The state in which the rod 57 of the steel material side connection part 55 is inserted into the loose hole 68 of the wood fire-resistant covering material side connection part 60 is called an engaged state. The loose hole 68 is formed in a circular shape with a larger diameter than the rod 57. In other words, the loose hole 68 is formed so that the steel material side connection part 55 and the wood fire-resistant covering material side connection part 60 can move relative to each other in the engaged state.

[0040] The bolster material 35 is fixed to the first wooden board portion 41A and the fireproof material 42 joined to the first wooden board portion 41A with fixing materials such as screws. The bolster material 35 secures a space between the steel material 31 and the fireproof wooden covering material 33 at the other end of the fireproof structure 30. If the center of gravity of the wooden board portion 41 is eccentric with respect to the engagement position of the connecting material 34, the lower part of the wooden board portion 41 will approach the steel material 31. In order to correct such an inclination of the material axis direction of the wooden board portion 41, the thickness of the bolster material 35 is adjusted on-site. The bolster material 35 is preferably made of a non-combustible material (for example, gypsum board, calcium silicate board, metal angle bar, etc.).

[0041] (Fireproof structure construction method) A description will now be given of an example of a method for constructing the fireproof structure 30. The method for constructing the fireproof structure 30 includes a manufacturing step, an erection step, and an enclosing step.

[0042] The manufacturing step is a process in which the components of the wood fire-resistant coating material 33 are transported to the construction site or a manufacturing facility outside the construction site, and the wood fire-resistant coating material side connection fixing unit is manufactured by fixing the fire-resistant material 42 etc. to the wood board portion 41.

[0043] Specifically, a first wood fire-resistant covering material side connection part fixing unit is produced by fixing the fire-resistant material 42, a pair of fire penetration prevention corner parts 43, base material 61, and wood fire-resistant covering material side connection part 60 to the first wooden board part 41A. Also, a second wood fire-resistant covering material side connection part fixing unit is produced by fixing the fire-resistant material 42, base material 61, and wood fire-resistant covering material side connection part 60 to the second wooden board part 41B. Figure 4 shows the first wood fire-resistant covering material side connection part fixing unit.

[0044] In addition, in the production step, the first and second wood fire-resistant coating material side connection fixing units can be arranged so as to form a hollow rectangular pillar and the dimensional values ​​of each part can be measured, thereby enabling inspection of the first and second wood fire-resistant coating material side connection fixing units.

[0045] The fabrication step may also include a process of fabricating a steel-side connection portion fixing unit in a fabrication facility by fixing the steel-side connection portion 55 to the steel material 31. Fig. 3 shows the steel-side connection portion fixing unit.

[0046] The erection step is a process in which the steel material 31 is installed in a predetermined position at a construction site of the construction facility. Specifically, the steel material 31 is installed in a predetermined position by joining the steel material 31 to the joint member 13. Note that the steel-material-side connection part 55 may be joined to the steel material 31 after it has been installed. In this case, the erection step may be performed prior to the fabrication step.

[0047] The surrounding step is a process of surrounding the installed steel material 31 with the first and second wood fire-resistant covering material side connection portion fixing units at the construction site of the building facility. First, as shown in FIG. 5, one of the first wood fire-resistant covering material side connection portion fixing units 70A is disposed so as to face the first side surface portion of the steel material 31.

[0048] 6, the first wood fire-resistant covering material side connection part fixing unit 70A is lifted and aligned, and then the rod 57 of the steel material side connection part 55 is inserted into the loose hole 68 of the wood fire-resistant covering material side connection part 60. This brings the steel material side connection part 55 and the wood fire-resistant covering material side connection part 60 into an engaged state, and the first wood fire-resistant covering material side connection part fixing unit 70A is in a temporary placement state. In the temporary placement state, the bolster material 35 prevents the lower part of the first wood fire-resistant covering material side connection part fixing unit 70A from displacing toward the steel material 31.

[0049] As shown in Fig. 7, in the temporary placement state, it is possible to move the wood fire-resistant covering material side connection part 60 relative to the steel material side connection part 55, i.e., to adjust the position of the first wood fire-resistant covering material side connection part fixing unit 70A relative to the steel material 31. More specifically, it is possible to adjust the position in the axial direction of the steel material 31 and in a planar direction perpendicular to the axial direction of the steel material 31. The planar direction is a direction that includes the facing direction (left-right direction in Fig. 7) in which the side part of the steel material 31 and the first wood board part 41A face each other, and the orthogonal direction (up-down direction in Fig. 7) perpendicular to the facing direction.

[0050] Next, the first wood fire-resistant covering material side connection part fixing unit 70A and one of the second wood fire-resistant covering material side connection part fixing units 70B are connected as shown in Fig. 8. At this time, the second wood board part 41B of the second wood fire-resistant covering material side connection part fixing unit 70B functions as the opposing wood board part, and the first wood board part 41A of the first wood fire-resistant covering material side connection part fixing unit 70A functions as the adjacent wood board part adjacent to the opposing wood board part.

[0051] First, the second wood fire-resistant covering material side connection part fixing unit 70B is placed so as to face the second side surface part of the steel material 31. Then, similarly to the first wood fire-resistant covering material side connection part fixing unit 70A, the rod material 57 of the steel material side connection part 55 is inserted into the loose hole 68 of the wood fire-resistant covering material side connection part 60. This places the second wood fire-resistant covering material side connection part fixing unit 70B in a temporary placement state.

[0052] Then, an end of the first wooden fire-resistant covering material side connection fixing unit 70A is fitted to an end of the second wooden fire-resistant covering material side connection fixing unit 70B, and then the second wooden board 41B and the fire-resistant material 42 attached to the second wooden board 41B are fixed to the flame penetration prevention corner 43 using fixing material 52. The first wooden board 41A and the second wooden board 41B are joined using board joint material 45. This allows the first wooden board 41A and the second wooden board 41B to be joined together with the second wooden board 41B fixed to the flame penetration prevention corner 43 and in close contact with the first wooden board 41A. The joining using the plate joint material 45 and the fixing using the fixing material 52 are performed while bringing the second wood fire-resistant covering material side connection part fixing unit 70B close to the steel material 31 so as to be aligned with the opposing direction of the second wood fire-resistant covering material side connection part fixing unit 70B. When the second wood fire-resistant covering material side connection part fixing unit 70B is connected to the first wood fire-resistant covering material side connection part fixing unit 70A in this manner, fillers 47, 54 are placed on the small ends 46, 53, respectively.

[0053] Next, as shown in Figure 9, in the same manner as the second wood fire-resistant coating material side connection portion fixing unit 70B, the other second wood fire-resistant coating material side connection portion fixing unit 70C is connected to the first wood fire-resistant coating material side connection portion fixing unit 70A so as to face the third side portion of the steel material 31.

[0054] The other first wood fireproof covering material side connection fixing unit 70D is placed so as to face the fourth side surface of the steel material 31. After alignment, the rod 57 of the steel material side connection part 55 is inserted into the loose hole 68 of the wood fireproof covering material side connection part 60. This puts the first wood fireproof covering material side connection fixing unit 70D in a temporary placement state. Then, the two second wood board parts 41B and the fireproof materials 42 attached to the second wood board parts 41B are fixed to the flame penetration prevention corner parts 43 of the first wood fireproof covering material side connection fixing unit 70D using the fixing material 52. In addition, the two second wood board parts 41B are joined to the first wood board part 41A using the board part joint material 45. After these operations, filler wood 47, 54 are placed on each end 46, 53, respectively. When the second wood fire-resistant coating material side connection portion fixing units 70B, 70C and the first wood fire-resistant coating material side connection portion fixing unit 70D are connected in this manner, the steel material 31 is surrounded by the wood fire-resistant coating material 33 with an air layer 32 in between, as shown in Figure 2.

[0055] The effects of this embodiment will be described. (1) In the fireproof structure 30, when the wooden fireproof covering material 33 is applied, the engagement between the steel-side connecting portion 55 and the wooden fireproof covering material-side connecting portion 60 allows each wooden fireproof covering material-side connecting portion fixing unit 70A-70D to be placed in a temporary state. This allows easy alignment of each wooden fireproof covering material-side connecting portion fixing unit 70A-70D, as well as easy connection between the wooden fireproof covering material-side connecting portion fixing units. Furthermore, the first wooden fireproof covering material-side connecting portion fixing unit 70A and the second wooden fireproof covering material-side connecting portion fixing unit 70B are connected to each other while the second wooden fireproof covering material-side connecting portion fixing unit 70B is brought close to the second wooden fireproof covering material-side connecting portion fixing unit 70B in the opposing direction of the second wooden fireproof covering material-side connecting portion fixing unit 70B with respect to the steel material 31. This prevents the need to drive screws or the like from the outside wall side, even if there is an exterior wall behind the first wooden fireproof covering material-side connecting portion fixing units 70A and 70D and no working space can be secured. For these reasons, the workability of the fireproof structure 30 can be improved.

[0056] (2) The fireproof material 42 is provided on the wooden board portion 41 facing the air layer 32. This can improve the fire resistance of the fireproof structure 30 in addition to improving workability. (3) In addition, the fire-resistant structure 30 is provided with flame penetration prevention corners 43 that press against the joints of adjacent fire-resistant materials 42.

[0057] Here, as shown in FIG. 10, when a fire breaks out, the fire-resistant structure 30 is susceptible to heat at the outer corners of the wooden fire-resistant covering material 33. In particular, the gaps between the wooden boards 41A and 41B are susceptible to heat. In the fire-resistant structure 30, when the wooden boards 41A and 41B burn in the gaps, the fire-resistant material 42 is exposed. At this time, the flame penetration prevention corners 43, the joint material 51, and the fixing material 52 prevent gaps from being formed at the joints of the fire-resistant material 42, and by supporting the fire-resistant material 42, they prevent the fire-resistant material 42 from falling off. This makes it possible to suppress the penetration of flames into the inside of the wooden fire-resistant covering material 33. As a result, the fire resistance of the fire-resistant structure 30 can be further improved. In addition, since the first wooden board 41A and the second wooden board 41B are joined by the board joint material 45, when a fire breaks out, the second wooden board 41B, which is the winning side, is less likely to warp. In other words, it is possible to reduce the gap that occurs between the wooden boards 41A and 41B in the event of a fire.

[0058] (4) In the connecting material 34, a rod 57 is provided in the steel-side connecting part 55, and a loose hole 68 into which the rod 57 engages is provided in the wood fire-resistant covering material side connecting part 60. This allows relative movement between the steel-side connecting part 55 and the wood fire-resistant covering material side connecting part 60. As a result, even when the steel-side connecting part 55 and the wood fire-resistant covering material side connecting part 60 are engaged, the position of the steel material 31 in the axial direction and the position of the steel material 31 in a planar direction perpendicular to the axial direction can be adjusted.

[0059] (5) The wooden fire-resistant covering material side connection part 60 is fixed to the wooden board part 41 via the base material 61. The base material 61 is also fixed to the wooden board part 41 at multiple locations. In this way, many support points for the fire-resistant material 42 can be provided, making it difficult for the fire-resistant material 42 and the wooden fire-resistant covering material side connection part 60 to fall off.

[0060] (6) The steel material side connection part 55 and the wood fire-resistant covering material side connection part 60 are engaged with each other at the upper part of the steel material 31. The weight of the wood fire-resistant covering material 33 can be distributed and transmitted to the wood fire-resistant covering material side connection part 60.

[0061] (7) By forming the concrete material inside the steel material 31, a part of the heat received by the steel material 31 can be transferred to the concrete material. As a result, a decrease in the strength of the steel material 31 due to the influence of heat can be suppressed.

[0062] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. The wood fire-resistant covering material side connection part 60 may be fixed to the wood board part 41 without using the base material 61 therebetween.

[0063] The base material 61 is not limited to a frame-like shape, and may be, for example, a vertical material extending downward from the connection part 60 on the wood fire-resistant covering material side. The connecting material 34 may be configured, for example, such that the steel-side connecting portion 55 and the wood fire-resistant covering material-side connecting portion 60 engage with each other at multiple points on the upper portion of the steel material 31. With this configuration, the load acting on the base material 61 can be effectively distributed.

[0064] The connecting material 34 may be configured such that the steel material side connecting portion 55 and the wood fire-resistant covering material side connecting portion 60 engage with each other at the lower portion of the steel material 31 or in the middle portion of the steel material 31 . The connecting member 34 may be made of a ready-made product, such as an interlocking metal fitting. By using a ready-made product, the manufacturing cost can be reduced.

[0065] The loose hole 68 may be an elongated hole extending in a specific direction as long as the rod 57 can be inserted therein. The fireproof structure 30 does not have to include the fireproof material 42. In other words, the fireproof corners 43 and the base material 61 may be directly fixed to the wooden boards 41. In this case, it is preferable that the fireproof corners 43 are provided so as to be flush with the end face of the losing wooden board 41.

[0066] The engagement structure of the connection member 34 is not limited to a structure in which the rod 57 is inserted into the loose hole 68, but may be realized by, for example, a fitting structure between a convex portion and a concave portion. The engagement between the steel side connection portion 55 of the connecting material 34 and the wood fire-resistant covering material side connection portion 60 may be performed for all of the wood fire-resistant covering material side connection portion fixing units 70A-70D before connecting the wood fire-resistant covering material side connection portion fixing units 70A-70D.

[0067] The fire-resistant structure 30 may be applied not only to columns but also to beams. When the fireproof structure is applied to a beam, an H-shaped steel having a pair of upper and lower flanges and a web between the flanges is arranged as a steel material, and a steel-side connection part is fixed to both ends of the upper flange of the H-shaped steel, and a pair of wood board parts to which a wood fireproof covering material side connection part that engages with the steel-side connection part is fixed are arranged on both sides of the H-shaped steel, separated by an air layer. Also, a wood board part that forms the bottom surface of the beam is arranged separated by an air layer from the bottom surface of the lower flange of the H-shaped steel. When this beam is installed under a concrete floor, a concrete floor is installed on the top surface of the upper flange of the H-shaped steel via studs or the like, and an air layer is formed on three sides of the beam, both sides and the bottom surface. Note that when the fireproof structure is installed in contact with an exterior wall, the air layer is omitted on the exterior wall surface side, and the steel material is partially surrounded on two or three sides, etc.

[0068] In the above embodiment, the engagement of the connecting members 34 and the fixing and joining of the wooden boards 41 are performed one by one in order. However, the present invention is not limited to this, and the construction method of the fireproof structure may be as follows.

[0069] For example, as shown in Fig. 11, a first L-shaped unit 75A and a second L-shaped unit 75B are manufactured in advance by joining and fixing one first wooden board part 41A and one second wooden board part 41B. Then, after engaging the first L-shaped unit 75A and the second L-shaped unit 75B with the connecting material 34, the L-shaped units 75A and 75B are joined and fixed to form the fireproof structure 30. In each of the L-shaped units 75A and 75B, the flame penetration prevention corner 43 that fixes the first wooden board part 41A and the second wooden board part 41B is the first flame penetration prevention corner. The flame penetration prevention corner 43 that is fixed only to the first wooden board part 41A is the second flame penetration prevention corner.

[0070] 9, a channel type unit may be fabricated in advance by connecting one first wooden board part 41A and a pair of second wooden board parts 41B. Then, after engaging the channel type unit and the other first wooden board part 41A with a connecting member 34, the wooden board part 41B of the channel type unit and the other first wooden board part 41A are fixed and joined to each other, thereby forming the fireproof structure 30. [Explanation of symbols]

[0071] 10...Upright structure, 11...Lower structure, 12...Upper structure, 13...Connection member, 14...Beam, 15...Slab, 17...Connection member, 18...Beam, 30...Fireproof structure, 31...Steel material, 32...Air layer, 33...Wood fireproof covering material, 34...Connection material, 35...Pillow material, 40...Fireproof structure, 41...Wood board section, 41A...First wood board section, 41B...Second wood board section, 42...Fireproof material, 43...Flame penetration prevention corner, 45...Board section joint material, 46...Board section joint edge, 47...Pin wood, 51... Jointing material, 52...fixing material, 53...small fixing edge, 54...filler, 55...steel side connection part, 56...angle iron, 57...bar, 60...wooden fire-resistant covering material side connection part, 61...base material, 62...side frame part, 63...bottom frame part, 64...middle frame part, 65...base fixing material, 68...loose hole, 70A, 70D...first woody fire-resistant covering material side connection part fixing unit, 70B, 70C...second woody fire-resistant covering material side connection part fixing unit, 75A...first L-shaped unit, 75B...second L-shaped unit.

Claims

1. Steel and An air space surrounding the steel material; A fire-resistant structure having a wood fire-resistant covering material surrounding the air layer, A connecting material is provided in the air layer to connect the steel material and the wood fire-resistant covering material, The wood fire-resistant coating material is The steel member is formed by joining a plurality of wooden boards arranged so as to surround the steel member, The connecting material is A steel material side connection portion fixed to the steel material; A wood fireproof covering material side connection part fixed to the wood board part, The steel material side connection portion and the wood fire-resistant covering material side connection portion are engaged with each other. Fireproof construction.

2. A fireproof material is provided facing the air layer side of the wood fireproof covering material, The wooden fire-resistant covering material side connection portion is fixed to the fire-resistant material and the wooden board portion.

2. The fire resistant structure of claim 1.

3. The connecting material is A rod material fixed to one of the steel material side connection portion or the wood fire-resistant covering material side connection portion; A loose hole is provided in the other of the steel material side connection part or the wood fire-resistant covering material side connection part, and the rod is engaged with the loose hole, allowing the steel material side connection part and the wood fire-resistant covering material side connection part to move relatively.

3. A fire-resistant structure according to claim 1 or 2.

4. The direction in which the relative movement is possible is the direction in which the steel material and the wooden board portion face each other.

4. The fire-resistant structure according to claim 3.

5. The direction in which the relative movement is possible is a direction perpendicular to the direction in which the steel material and the wooden board portion face each other.

4. The fire-resistant structure according to claim 3.

6. The direction in which the relative movement is possible is the axial direction of the steel material.

4. The fire-resistant structure according to claim 3.

7. A concrete material is provided inside the steel material, and the steel material and the concrete material form a steel pipe concrete structure.

2. The fire resistant structure of claim 1.

8. The wood fire-resistant covering material side connection portion is fixed to the wood board portion via a base material, The steel material side connection portion and the wood fire-resistant covering material side connection portion are engaged with each other at the upper portion of the steel material.

2. The fire resistant structure of claim 1.

9. The base material is fixed to the wooden board at multiple points.

9. The fire resistant structure of claim 8.

10. A construction method for a fire-resistant structure having a steel material, an air space surrounding the steel material, a wood fire-resistant covering material surrounding the air space, and a connecting material connecting the steel material and the wood fire-resistant covering material in the air space, comprising: The wood fire-resistant coating material is The air gap is formed by joining a plurality of wooden boards arranged to surround the air gap, The connecting material is A steel material side connection portion fixed to the steel material; A wood fire-resistant covering material side connection part fixed to the wood board part, A step of manufacturing a steel material side connection portion fixing unit in which the steel material and the steel material side connection portion are fixed in advance; A step of manufacturing a wood fire-resistant covering material side connection part fixing unit in which the wood board part and the wood fire-resistant covering material side connection part are fixed in advance; and engaging the steel material side connection portion fixing unit and the wood fire-resistant covering material side connection portion fixing unit at a construction site. How to construct fire-resistant structures.

11. A construction method for a fire-resistant structure having a steel material, an air space surrounding the steel material, a wood fire-resistant covering material surrounding the air space, and a connecting material connecting the steel material and the wood fire-resistant covering material in the air space, comprising: The wood fire-resistant coating material is The air gap is formed by joining a plurality of wooden boards arranged to surround the air gap, The connecting material is A steel material side connection portion fixed to the steel material; a wood fireproof covering material side connection part that is fixed to the wood board portion and engages with the steel material side connection part so as to be movable relative to the steel material side connection part in a direction in which the steel material and the wood board portion face each other; Among the adjacent wooden board parts, the wooden board part facing the steel material in the facing direction is defined as an opposing wooden board part, and the wooden board part adjacent to the opposing wooden board part is defined as an adjacent wooden board part. A flame penetration prevention corner is fixed to the adjacent wooden board portion to close the inner corner formed by joining with the opposing wooden board portion, With the steel-side connecting portion and the wood-based fire-resistant covering material-side connecting portion engaged with each other for the adjacent wood board portion and the opposing wood board portion, the opposing wood board portion is brought close to the steel material in the opposing direction, and the opposing wood board portion is fixed to the flame penetration prevention corner portion and joined to the adjacent wood board portion. How to construct fire-resistant structures.

12. A construction method for a fire-resistant structure having a steel material, an air space surrounding the steel material, a wood fire-resistant covering material surrounding the air space, and a connecting material connecting the steel material and the wood fire-resistant covering material in the air space, comprising: The wood fire-resistant coating material is A hollow rectangular prism is formed by joining a plurality of wooden boards arranged so as to surround the air layer, The connecting material is A steel material side connection portion fixed to the steel material; A wood fireproof covering material side connection part that is fixed to the wood board part and engages with the steel material side connection part, The fireproof structure is The wooden board further includes a flame penetration prevention corner portion fixed to the adjacent wooden board portions and closing an inner corner portion formed by the adjacent wooden board portions, a first L-shaped unit and a second L-shaped unit in which two adjacent wooden boards are joined together, the first L-shaped unit and the second L-shaped unit having, as the flame penetration prevention corners, a first flame penetration prevention corner fixed to the two wooden boards and a second flame penetration prevention corner provided on one of the two wooden boards and fixed to the wooden board of the other L-shaped unit; At a construction site, the connecting members are engaged for both the first L-shaped unit and the second L-shaped set, and then the second fire prevention corner of the first L-shaped unit is fixed to the wooden board portion of the second L-shaped unit, the second fire prevention corner of the second L-shaped unit is fixed to the wooden board portion of the second L-shaped unit, and the wooden board portion of the first L-shaped unit is joined to the wooden board portion of the second L-shaped unit. How to construct fire-resistant structures.

13. A construction method for a fire-resistant structure having a steel material, an air space surrounding the steel material, a wood fire-resistant covering material surrounding the air space, and a connecting material connecting the steel material and the wood fire-resistant covering material in the air space, comprising: The wood fire-resistant coating material is A hollow rectangular prism is formed by joining a plurality of wooden boards arranged so as to surround the air layer, The connecting material is A steel material side connection portion fixed to the steel material; A wood fireproof covering material side connection part that is fixed to the wood board part and engages with the steel material side connection part, The fireproof structure is The wooden board further includes a flame penetration prevention corner portion fixed to the adjacent wooden board portions and closing an inner corner portion formed by the adjacent wooden board portions, A channel-type unit is prefabricated in which the adjacent wooden board portions are joined and fixed at the flame penetration prevention corners, At the construction site, the connection material is engaged between the channel-type unit and the remaining wooden board portion, and then the wooden board portion of the channel-type unit is fixed to the remaining wooden board portion using the flame penetration prevention corner portion, and the wooden board portion of the channel-type unit is joined to the remaining wooden board portion. How to construct fire-resistant structures.

14. The adjacent wooden boards are joined together in such a manner that the side surface of the winning wooden board is in contact with the end surface of the losing wooden board, The fire prevention corner is fixed in advance to the end of the wooden board portion that is the losing side so as to be flush with the end surface. A method for constructing a fire-resistant structure according to any one of claims 10 to 13.

15. A fireproof material is provided on the wooden board portion facing the air layer side, The wood fire-resistant covering material side connection portion is fixed to the fire-resistant material and the wood board portion, The wooden board further includes a flame penetration prevention corner portion fixed to the adjacent wooden board portions and closing an inner corner portion formed by the adjacent wooden board portions, At the inner corners of the adjacent wooden boards, the end surface of the fireproof material on the losing side abuts against the side surface of the fireproof material on the winning side, The fire prevention corner is fixed in advance to the end of the fireproof material on the losing side so as to be flush with the end face. A method for constructing a fire-resistant structure according to any one of claims 10 to 13.

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