JP2020118022A - Fire proof wood - Google Patents

Abstract

To provide a fire proof wood having an excellent fire resistance and enhanced stable support property of finishing material.SOLUTION: The fire proof wood 10 has a prismatic core 12 constituting woody material, a thermal buffer material 14A mounted to a corner part of the core 12, a fire proof material 18A mounted to an outer side surface side of the core 12 and a finishing material 20 supported by the thermal buffer material 14A and covering the fire proof material 18A and the thermal buffer material 14A.SELECTED DRAWING: Figure 1

Description

The present invention relates to fireproof wood.

BACKGROUND ART Conventionally, as a wooden member that can be used as a pillar member or a beam member of a building and has improved fire resistance during a fire, a fire resistant wood as disclosed in Patent Document 1 is known. In the present specification, a state in which a fire has occurred is defined as "at the time of fire" and a state in which no fire has occurred as "normal time".

The fire-resistant wood of Patent Document 1 includes a wood load supporting portion as a core material (core material) arranged in the axial center, a fire resistant material layer provided over the entire outer surface of the wood load supporting portion, and a fire resistant material layer. It has a burnable wood layer provided on the outside through a spacer (coupling member). As the fireproof material layer, a fireproof coating material such as heat resistant rock wool is used. A gypsum board or the like is used as the connecting member. Further, the burnable wood layer is a finishing material of the outermost layer, and is fixed to the inner connecting member by adhesion, screws, or the like, and forms a part of the fire resistant wood.

JP, 2018-145654, A

However, in Patent Document 1, the finishing material is arranged so as to be fixed to the connecting member and surround the core material, but the connecting member is arranged in contact with the inner refractory covering material. It's just that. That is, since the connecting member is not attached to the fireproof coating on the inside, the connecting member is likely to come off from the fireproof coating, and as a result, the finishing material on the outside is also likely to come off.

The present invention has been made in view of the above problems, and an object thereof is to provide a fire-resistant wood having excellent fire resistance and improved stability of a finishing material.

In the first aspect of the present invention, a prismatic core material made of wood, a heat buffer material attached to a corner portion of the core material, a refractory material attached to an outer surface side of the core material, and a heat buffer material. And a finishing material covering the refractory material and the heat cushioning material.

In the first aspect, since the refractory material is attached to the outer surface side of the core material, the fire resistance of the outer surface is enhanced. In addition, a heat cushioning material that cushions heat transfer is provided at the corner portion of the core material. Normally, the corners of the pillars are at a disadvantageous position in terms of fire resistance because they are subjected to double-sided heating during a fire, but in the first aspect, the thermal shock-absorbing material suppresses the temperature rise of the corners, and therefore fire resistant wood is used. The fire resistance of is improved overall.

In addition to the function of buffering the transfer of heat, the thermal buffer material also functions as a support material for supporting the finishing material. For this reason, it becomes difficult for the finishing material to come off from the core material.

In the fireproof wood according to the second aspect of the present invention, in the first aspect, the heat buffer material is a steel material, an air layer is formed inside, and the finishing material is a fastening member whose tip is located in the air layer. It is attached to the cushioning material.

According to the refractory wood according to the second aspect, the heat cushioning material is a steel material having a relatively large heat capacity, so that the fire resistance of the refractory wood can be further enhanced. Further, since the air layer formed inside functions as a heat insulating layer, the fire resistance of the fire resistant wood is further improved.

In the second aspect, since the tip of the fastening member is located in the air layer of the thermal buffer and does not reach the core material, the heat of the fastening member exposed to the flame during a fire directly flows from the fastening member to the core material. Not transmitted. On the other hand, when the finishing material is attached by a metal fastening member so that the tip of the fastening member reaches the core material, the heat of the fastening member is directly transferred to the core material, which may promote carbonization or combustion of the core material. There is. In this respect, in the case of the second aspect, since heat is not directly transferred from the fastening members to the core material, the possibility of carbonization or combustion of the core material is reduced, and the fire resistance of the fire resistant wood can be further enhanced.

Further, since the tip of the fastening member 22 is located in the air layer, the area in which the outer surface of the fastening member contacts the surroundings is reduced as compared with the case where the tip reaches the core material 12 and is located. For this reason, the frictional force that the fastening member receives from the surroundings at the time of insertion and removal is reduced, so that the fastening member can be easily inserted and removed, and the burden of the work of attaching and removing the finishing material can be reduced.

A fire resistant wood according to a third aspect of the present invention is the fire resistant wood according to the first aspect or the second aspect, wherein a lath net as a base material for supporting the refractory material is attached to the outer surface side of the core material, and the fire resistant material is the lath net. Is a foamable fireproof coating applied to.

In the fire-resistant wood according to the third aspect, the fire-resistant material is a foamable fire-resistant coating film that expands when a certain amount of heat is applied, so the thickness of the fire-resistant wood is kept small during normal times when no fire occurs. To be Therefore, the fireproof wood can be designed to be compact in size while enhancing the fireproofness of the fireproof wood. Further, since the base material of the fire-resistant coating film is lath net, the fire-resistant coating film is entangled in the mesh of the lath net and firmly supported. Therefore, according to the third aspect, even if the refractory coating expands and its volume increases, it is possible to prevent the expanded refractory coating from falling off the base material.

According to the fire-resistant wood according to the present invention, it is possible to provide the fire-resistant wood having excellent fire resistance and improved stability of the finishing material.

It is a perspective view which fractures|ruptures a part of finishing material and demonstrates the structure of the fireproof wood which concerns on this embodiment. It is sectional drawing at the time of seeing from above from the cross section of the fireproof wood which concerns on this embodiment perpendicular|vertical with respect to the axial direction (vertical direction in FIG. 1). It is sectional drawing explaining the state which the fireproof coating which is a fireproof material expanded in the fireproof wood which concerns on this embodiment. It is a sectional view of fire-resistant wood concerning a comparative example. It is a sectional view of fireproof wood concerning the 1st modification of this embodiment. It is sectional drawing explaining the state which the fireproof coating which is a fireproof material expanded in the fireproof wood which concerns on a 1st modification. (A) is a partial cross-sectional view of the fire-resistant wood according to the second modification, and (B) is a partial cross-sectional view of the fire-resistant wood according to the third modification. (A) is a partial cross-sectional view of the fire-resistant wood according to the fourth modification, and (B) is a partial cross-sectional view of the fire-resistant wood according to the fifth modification. It is sectional drawing at the time of seeing from above from the cross section of the fireproof wood which concerns on a 6th modification perpendicular|vertical to an axial direction.

Embodiments of the present invention will be described below. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the relationship between the thickness and the plane size in the drawings, the ratio of the thickness of each device or each member, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Further, there are included portions in which dimensional relationships and ratios are different between the drawings.

<Structure of fireproof wood>
As shown in FIG. 1, the refractory wood 10 according to the present embodiment has a prismatic core material 12 made of wood, a plurality of heat buffer materials 14A attached so as to cover the corner portions of the core material 12, and a core material 12 The refractory material 18A attached to the outer surface side of the. Further, the fireproof wood 10 has a finish 20 supported by the heat cushioning material 14A and covering the fireproof material 18A and the heat cushioning material 14A.

The core material 12 has a rectangular column shape, and as the tree species, for example, cedar, cypress, etc. can be appropriately adopted. In the present invention, the shape of the core material is not limited to the quadrangular prism, but may be another polygonal prism such as an octagonal prism. Further, as the shape of the core material, the corners of the prism may be chamfered, or may be a shape other than the prism, such as a cylinder. Further, the core material is not limited to a single material, and a laminated material may be used.

As shown in FIG. 2, the thermal buffer material 14A is a rectangular steel tube having a rectangular outer edge in cross section, and is attached so as to cover the corners of two adjacent surfaces at each of the four corners of the core material 12. Specifically, one square steel pipe is arranged on each of the two adjacent surfaces of the corners, and the corners are arranged so as to make substantially linear contact with each other.

The length of the heat buffer material 14A in the longitudinal direction (vertical direction in FIG. 1) is the same as the length of the core material 12 in the longitudinal direction, and the heat buffer material 14A buffers heat applied to the core material 12 at the time of fire. .. The thermal buffer material 14A and the core material 12 are integrated by, for example, an adhesive agent or a drift pin. An air layer is formed inside the steel pipe of the heat buffer material 14A, and the formed air layer functions as a heat insulating layer in the event of a fire.

The refractory material 18A is, for example, a foamable refractory coating that expands when heated and exceeds a certain temperature. The thickness of the fire-resistant coating film can expand to more than 5 times the normal thickness in the event of a fire. A lath net 16 as a base material for supporting the refractory material 18A is attached to the outer surface side of the core material 12.

The lath net 16 is attached to the pair of thermal buffer materials 14A and 14A by being bridged between the pair of thermal buffer materials 14A and 14A, which are respectively attached to the corners at both ends of one side of the core material 12 in FIG. ing. Similarly, on the other side of the four sides of the core material 12, the lath net 16 is attached by being bridged over the pair of thermal buffer materials 14A and 14A at both ends. The arrangement pattern of the lath net 16 is not limited to the one illustrated in FIG. 2 that is bridged between the pair of thermal buffer materials 14A and 14A, and for example, the entire outer surface of the thermal buffer material 14A may be covered. , May be arranged on the heat cushioning material 14A. The refractory material 18A is continuously applied with a constant thickness on the lath net 16 and on the outer surface of the thermal buffer material 14A. The refractory material 18A can be applied, for example, by spraying a refractory paint using a spraying device such as a spray or brush coating.

Here, for example, instead of using a fire-resistant coating film, a method of applying a fire-resistant coating around the core material 12 to improve the fire resistance of wood is known. However, in the case of a fireproof coating, in order to secure the fireproofness of the wood that is easily combustible for a predetermined time, it is often necessary to construct it relatively thick, for example, 60 mm or more. Therefore, there is a problem that the construction work is troublesome and the cost is high. Further, there are also known a method of providing a fire-stop layer around the core material 12 and a method of realizing a so-called hybrid type fire-resistant wood by combining a wood material and a steel frame member. There is a problem that it takes time and effort.

In this respect, in the present embodiment, it is only necessary to spray the refractory paint onto the entire outer surface of the core material 12 at one time by using the spraying device, so that the work load related to the fireproof treatment can be reduced. In this embodiment, the fire-resistant material 18A of the fire-resistant paint is coated with a relatively large thickness of about 5 mm or more, whereby the fire resistance equivalent to the fire-resistant coating can be realized without using the fire-resistant coating.

Further, the lath net 16 may be formed, for example, by bending and intertwining an iron wire or a steel wire, or may be formed by combining reinforcing bars so as to intersect each other. Alternatively, a lath net formed by punching an iron plate or a steel plate to form a mesh pattern may be used. Further, as the mesh pattern, in addition to the diamond shape illustrated in FIG. 1, other shapes such as a rectangular shape and a circular shape can be appropriately adopted. Further, as the lath net 16, linear members such as iron wires, steel wires or reinforcing bars may be arranged orthogonally to each other so that the whole is in a lattice shape when viewed from the front.

Further, in the present invention, a material other than metal may be used for the lath net. Further, the plurality of linear members may be arranged in parallel along one direction without intersecting each other. However, like the lath net 16 illustrated in FIG. 1, when the linear members intersect, the shape of the intersecting portion is not flat, and a certain unevenness is formed at the intersecting position. At the intersecting positions of the irregularities, the refractory coating is likely to be entangled with the linear member, so that the refractory material 18A can be held more firmly.

The finishing material 20 can be made of wood (general wood) used for general wooden construction such as cedar and cypress. The finishing material 20 is attached to and supported by the heat cushioning material 14A using a metal fastening member 22 having a relatively high thermal conductivity such as a screw or a nail. It should be noted that a prepared hole for inserting the fastening member 22 may be formed in advance in the heat buffer material 14A.

As shown in FIG. 2, the fastening member 22 is inserted from the outside, the tip is located in the air layer inside the steel pipe that is the heat buffer material 14A, and does not reach the inside of the core material 12. The method of attaching the finishing material 20 to the thermal buffer material 14A is not limited to the fastening member 22, and other means such as an adhesive may be used.

Further, in the present invention, as the finishing material, a material other than general wood can be appropriately adopted. In particular, for the purpose of enhancing fire resistance, a layer capable of exhibiting a flame-retardant effect (a flame-retardant layer) can be suitably adopted as a finishing material. The flame-retardant layer includes a layer having flame retardancy and a layer capable of suppressing heat conduction. Specifically, for example, as the flame-retardant layer, a flame-retardant agent injection layer obtained by injecting a flame-retardant agent into wood to make it incombustible can be used. The layer capable of suppressing heat conduction may be formed of a material having a larger heat capacity than general wood, a material having a higher heat insulating property than general wood, or a material having a higher thermal inertia than general wood, or these materials. And general wood may be combined and formed.

As the material having a larger heat capacity than general wood, for example, mortar, stone material, glass, fiber reinforced cement, inorganic materials such as gypsum, and various metal materials can be used. Further, examples of the material having a higher heat insulating property than general wood include calcium silicate board, gypsum board, rock wool, glass wool and the like. Further, as a material having a higher thermal inertia than general wood, wood such as serra ganba, jara, bongosi and the like can be used. By thus increasing the fire resistance of the finishing material 20, the fire resistance of the fire resistant wood 10 can be further enhanced.

The fireproof wood 10 according to the present embodiment can be used as various members in a fireproof building such as a pillar, a beam, a floor, and a wall. Then, as shown in FIG. 3, when a fire occurs, even if the finishing material 20 located outside the fireproof wood 10 disappears, the heatproof material 18A1 expands for a certain period of time. The expanded 18A1 covers the entire outer surface of the refractory wood 10 and protects the core material 12 and the heat cushioning material 14A from the flame.

(Action effect)
In the refractory wood 10 according to the present embodiment, since the refractory material 18A is attached to the outer surface side of the core material 12, the fire resistance of the outer surface is enhanced. In addition, a thermal buffer material 14A that buffers heat transfer is provided at the corner of the core material 12 so as to cover the corner. Normally, the corners of the pillars are in a disadvantageous position in terms of fire resistance because they are subjected to two-sided heating in the event of a fire, but in the present embodiment, the thermal shock-absorbing material 14A suppresses the temperature rise of the corners, and thus the fire resistance is improved. The fire resistance of the wood 10 is generally improved.

In addition to the function of buffering heat transfer, the thermal buffer material 14A also functions as a support material for supporting the finishing material 20. In the present embodiment, since the thermal cushioning material 14A is attached to both the core material 12 and the finishing material 20, the finishing material 20 is compared with the structure in which the supporting material is only in contact with and supported by the inner member. It's hard to come off from 12.

Therefore, according to the fire-resistant wood 10 according to the present embodiment, it is possible to provide the fire-resistant wood 10 having excellent fire resistance and improved stable support of the finishing material 20. In addition, since the heat cushioning material 14A is a member that also serves as a support for the finishing material 20, a support material different from the heat cushioning material 14A is not required, so that the number of members constituting the refractory wood 10 can be reduced. become.

Further, according to the present embodiment, since the heat buffer material 14A is a steel material having a relatively large heat capacity, the fire resistance of the fire resistant wood 10 can be further enhanced. Further, the air layer formed inside functions as a heat insulating layer, so that the fire resistance of the fire resistant wood 10 is further improved.

In addition, since the tip of the metal fastening member 22 is located in the air layer of the thermal buffer material 14A and does not reach the core material 12, the heat of the fastening member 22 exposed to the flame during a fire is No direct transmission from 22 to the core 12. On the other hand, as shown in FIG. 4, in the case of the fire-resistant wood 10Z according to the comparative example, the finishing material 20 is attached by the metal fastening member 22 so that the tip of the fastening member 22 reaches the core material 12. There is.

In the case of the comparative example, the heat of the fastening members 22 may be directly transferred to the core material 12, and the carbonization and combustion of the core material 12 may be promoted. In this respect, in the case of the present embodiment, as shown in FIG. 3, since the heat buffer material 14A is interposed, heat is not directly transferred from the fastening members 22 to the core material 12, so that the core material 12 can be carbonized or burned. Therefore, the fire resistance of the fireproof wood 10 can be further improved. Further, since the tip of the fastening member 22 may damage or damage the core material 12 in some cases, the core material 12 may be vulnerable to heat. However, according to the present embodiment, the core material 12 is prevented from being damaged or damaged. it can.

Further, since the tip of the fastening member 22 is located in the air layer, the area in which the outer side surface of the fastening member 22 contacts the surroundings is reduced as compared with the case where the tip reaches the core material 12 and is located. For this reason, the frictional force that the fastening members 22 receive from the surroundings during insertion/removal is reduced, so that the fastening members 22 can be easily inserted/removed, and the work of attaching/detaching the finishing material 20 can be reduced. Therefore, according to the present embodiment, in combination with not damaging the core material 12, the finishing material 20 can be easily replaced during repair or the like.

Further, in the present embodiment, the refractory material 18A is a foamable refractory coating that expands when a certain amount of heat is applied, so the thickness of the refractory wood 10 is kept small during normal times when no fire occurs. To be Therefore, the fireproof wood 10 can be designed to be compact in size while enhancing the fireproofness of the fireproof wood 10.

Further, since the base material of the fire-resistant coating film is the lath net 16 having irregularities, the fire-resistant coating film is entangled in the mesh of the lath net 16 and is firmly supported. Therefore, according to the present embodiment, even if the refractory coating expands and its volume increases, it is possible to prevent the expanded refractory coating from falling off the base material. Further, the lath net 16 allows the refractory material 18A to be coated relatively thickly on the outer surface side of the core material 12. For this reason, it becomes possible to realize the necessary fire resistance even with only the refractory material 18A of the fire-resistant coating film, and to reduce the time and effort for performing the fire-resistant treatment such as the fire-resistant coating other than the refractory material 18A.

Further, in the present embodiment, a steel pipe is used as the heat buffer material 14A, and the steel material including the steel pipe has a large heat capacity, but also has a relatively high thermal conductivity. However, since the refractory material 18A is coated on the outer surface of the heat buffer material 14A of the steel pipe, it is possible to suppress the transfer of heat from the heat buffer material 14A to the core material 12 during a fire.

<First Modification>
Next, fire resistant woods 10A to 10E according to first to fifth modifications of the present embodiment will be described. In the following description of the refractory woods 10A to 10E according to the modification, differences from the refractory wood 10 shown in FIGS. 1 to 3 will be mainly described, and duplicate description of equivalent members having the same name will be omitted.

In the refractory wood 10 shown in FIGS. 1 to 3, the refractory material 18A was continuously provided on the lath net 16 and on the outer side surface of the heat cushioning material 14A, but as shown in FIG. 18B may not be provided on the outer side surface of the heat cushioning material 14A. In the refractory wood 10A according to the first modified example illustrated in FIG. 5, the refractory material 18B is provided only on the lath net 16, and on the outer surface of the thermal buffer material 14A, a region near the lath net 16 is provided. Other than that, it is not provided.

Also in the case of the fireproof wood 10A according to the first modification, the fireproof material 18B provided on the lath net 16 expands during a fire. As shown in FIG. 6, the refractory material 18B1 expands outward from each of the four sides of the core material 12. Then, at the corners at both ends of each side of the core material 12, the expanded refractory materials 18B1 wrap around and join together to cover the outer surface of the thermal buffer material 14A. That is, in the first modified example, the coating film of the refractory material 18B in the normal state is arranged so that the refractory material 18B1 expanded during the fire joins at the corners of the adjacent side surfaces so that the outer surface of the heat cushioning material 14A is not exposed. Is set.

According to the first modified example, normally, the refractory material 18B is not provided in the portion of the outer surface of the heat cushioning material 14A facing the finishing material 20, and the outer surface of the heat cushioning material 14A is exposed, so The prepared hole for inserting the attaching member 22 can be easily processed. Further, as compared with the fireproof wood 10 shown in FIGS. 1 to 3, it is possible to suppress the amount of the fireproof material 18B used within a range in which the necessary fire resistance of the fireproof wood 10A can be realized.

In FIG. 5, the refractory material 18B was not applied to the outer surfaces of the two adjacent thermal buffer materials 14A that are adjacent to each other at the corners and that face each other. However, by partially applying the refractory material 18B on the opposing outer surfaces, the resistance to the heat from the side of the finishing material 20 toward the center of the core material 12 at the corners may be further enhanced.

Further, the fire resistance may be enhanced by filling (filling) the hollow portion inside the steel pipe of the heat buffer material 14A with a fire resistant material such as rock wool. The refractory material may be other than rock wool. For example, the refractory material may be formed by pouring mortar or gypsum into the hollow portion after inserting the fastening member 22. By thus filling the hollow portion of the heat buffer material 14A with the refractory material and increasing the fire resistance of the corners, the fire resistance of the refractory wood 10A can be further reinforced while suppressing the amount of the refractory material 18B used. .. The configuration in which the hollow portion of the heat buffer material is filled with the refractory material is not limited to the case of the refractory wood 10A according to the first modified example, and all the refractory wood 10 shown in FIG. Applicable to refractory wood.

<Second Modification>
In the refractory wood 10 shown in FIGS. 1 to 3, the heat buffer material 14A was a rectangular steel pipe. However, as shown in FIG. 7(A), a channel material made of steel having a C-shaped cross section is provided as a thermal buffer material 14B so as to be adjacent to each other at a corner portion of the core material 12, and inside the thermal buffer material 14B. An air layer may be formed between the core material 12 and the core material 12. As in the case of the refractory wood 10B according to the second modified example illustrated in FIG. 7(A), as long as it is a bent or curved steel material capable of forming an air layer inside, the present invention is not limited to the rectangular steel pipe. Can be used as a heat buffer material.

<Third Modification>
Further, it is not essential that two heat buffer materials are arranged for one corner portion of the core material 12, and as shown in FIG. 7B, the heat buffer material 14C is one heat buffer material. One may be arranged for each corner portion of the. In the refractory wood 10C according to the third modified example illustrated in FIG. 7B, the thermal buffer material 14C is a channel material, and an air layer is formed inside the core material 12 with the thermal buffer material 14C. In the case of the third modified example, by disposing the thermal buffer material 14C so that the corner portion of the core material 12 is located inside the C-shape of the thermal buffer material 14C, it is possible to alleviate the two-sided heating of the corner portion, The amount of the thermal buffer material 14C used can be suppressed within a range in which the required fire resistance can be realized.

<Fourth Modification>
In the case of the refractory wood 10D according to the fourth modified example illustrated in FIG. 8A, the channel material as the heat cushioning material 14D has three C-shaped outer surfaces, and one of the three outer surfaces. The outer surface of each piece is joined to the outer surface of the core material 12. Even if the closed air layer is not formed inside the heat cushioning material 14D as in the case of the fire resistant wood 10D according to the fourth modification, in other words, even if the open air layer is formed, The invention is realized. Further, according to the fourth modified example, the thermal buffer material 14D is joined to the core material 12 by using the outer side surface wider than the end surface. Therefore, as compared with the case where the end surfaces of the thermal buffer materials 14B and 14C are joined to the outer surface of the core material 12 as shown in FIG. 7, the integrity of the thermal buffer material 14D and the core material 12 can be enhanced.

In FIG. 8(A), the refractory material 18A is applied to the outer surface of the heat cushioning material 14D facing the finishing material 20, and the finishing material 20 is thermally buffered via the applied refractory material 18A. The case where it is supported by the member 14D has been illustrated. However, the present invention is not limited to this, and for example, the refractory material 18A is not applied to the outer surface of the thermal cushioning material 14D facing the finishing material 20, and the finishing material 20 is directly supported by the thermal cushioning material 14D. Good. That is, the refractory material 18A may be partially omitted as long as the required fire resistance can be realized.

<Fifth Modification>
Further, as shown in FIG. 8B, the heat buffer material 14E may be an angle material (equilateral angle steel) having an L-shaped cross section. In the case of the refractory wood 10E according to the fifth modified example illustrated in FIG. 8B, the thermal cushioning material 14E has two L-shaped outer surfaces, and one of the two outer surfaces has an outer surface. , The outer surface of the core material 12 is joined. An auxiliary support member 26 is attached to a portion of the heat cushioning material 14E where the other outer surface is located, via a fixture 28 such as a screw or a nail.

The auxiliary support member 26 has an L-shaped cross section, and connects the thermal buffer material 14E and the finishing material 20. The auxiliary support member 26 has two L-shaped outer surfaces, like the heat buffer material 14E, and one outer surface of the two is joined to the inner surface of the heat buffer material 14E. The other outer side surface of the auxiliary support member 26 is joined to the inner side surface of the finishing material 20. The auxiliary support member 26 is attached to the finishing material 20 by the fastening member 22.

The length of the auxiliary support member 26 in the longitudinal direction may be the same as that of the heat buffer material 14E or may be shorter than that of the heat buffer material 14E as long as it can support the finishing material 20. Further, in FIG. 8B, the fixing tool 28 having a sharp tip like a screw or a nail is illustrated, but the present invention is not limited to this. As the fixing tool, it is sufficient that the heat buffer material 14E and the auxiliary supporting member 26 can be integrally fixed, and for example, a bolt and a nut may be used. Alternatively, the thermal buffer material 14E and the auxiliary support member 26 may be bonded with an adhesive.

<Sixth Modification>
In FIG. 1 to FIG. 8, the case where the structure of the refractory materials 18A and 18B of the refractory wood 10, 10A to 10E is one layer is illustrated, but the present invention is not limited to this, and the refractory material has two or more layers. May be For example, as shown in FIG. 9, a fireproof wood 10F according to the sixth modification has a fireproof material 18C having a two-layer structure including an inner layer 18C1 and an outer layer 18C2.

The inner layer 18C1 of the refractory material 18C is, for example, a gypsum board, and is arranged in the central area of the outer surface (peripheral surface) of the core material 12 excluding the corners where the heat buffer material 14A is arranged. That is, in the fireproof wood 10F, the four inner layers 18C1 of the gypsum board are attached to the four outer surfaces of the core material 12 at the portions where the heat cushioning material 14A is not arranged. The inner layer 18C1 is fixed to the core 12 directly or indirectly via a rafter or the like by a fixing member (not shown) such as a screw.

The inner layer 18C1 is a layer having fire resistance while enhancing heat insulation. In addition, in the present invention, the inner layer is not limited to the gypsum board, and other materials can be appropriately adopted. For example, calcium silicate board, precast concrete board, ALC board, water glass impregnated cork, roll type rock wool mat, water glass impregnated rock wool mat, or sprayed rock wool can be used as the inner layer. .. That is, it is preferable that the inner layer is a material that is normally in a solid state and supports moisture in an air-dried state.

In the sixth modified example, as in the case of the refractory material 18A of the refractory wood 10 illustrated in FIG. 2, a pair of heat buffer materials 14A and 14A are attached to the corner portions of both ends of one side of the core material 12, respectively. A lath net 16 is laid between the heat buffer materials 14A and 14A. However, as shown in FIG. 9, in the refractory material 18C of the sixth modified example, since the inner layer 18C1 is provided, the lath net 16 is illustrated in FIG. 2 on the outer surface of the heat buffer material 14A. It is attached to the outside of the case of the refractory material 18A of the fireproof wood 10.

The outer layer 18C2 of the refractory material 18C is a foamable refractory paint continuously applied with a constant thickness, as in the case of the refractory material 18A of the refractory wood 10 illustrated in FIG. Similarly, the outer layer 18C2 can be applied on the outer peripheral surfaces of the inner layer 18C1 and the heat buffer material 14A by spraying or brushing using a spraying device such as a spray. The outer layer 18C2 is formed of a material capable of containing bubbles at least at a predetermined temperature or higher.

The “predetermined temperature” is a temperature at which the moisture carried on the inner layer 18C1 is vaporized by a flame or heat, and specifically, a temperature of 100° C. Also in the sixth modified example, when the outer layer 18C2 is heated to a predetermined temperature or higher during a fire, the outer layer 18C2 foams to form bubbles, thereby increasing the volume of the outer layer 18C2. Then, as shown in FIG. 3, the outer layer 18C2 expands and the fire resistance is realized.

In the sixth modified example, a gypsum board that further enhances heat insulation is provided as the inner layer 18C1 inside the outer layer 18C2 of the fire-resistant paint. Therefore, compared with the case where the refractory material is composed of only one layer of the refractory paint, it is possible to favorably achieve both enhancement of heat insulation and improvement of fire resistance.

<Other embodiments>
Although the present invention has been described by the above disclosed embodiments, this description is not intended to limit the present invention. It should be considered that various alternative embodiments, examples, and operation techniques will be apparent to those skilled in the art from the present disclosure.

For example, in the present embodiment, the heat buffer materials 14A to 14E are all steel materials, but the present invention is not limited to this, and examples thereof include concrete, ceramic, wood, gypsum, gypsum board, calcium silicate board, and the like. Materials other than steel may be adopted as the heat buffer material. As other materials, various materials that can be used as the flame-retardant layer mentioned in the description of the finishing material 20 can be adopted.

Further, in the present embodiment, as the refractory material 18A, a foamable refractory coating film supported by the lath net 16 is exemplified, but the present invention is not limited to this combination, and for example, a refractory paint of the core material 12 is used. It may be directly coated on the outer surface. Further, the refractory material 18A does not need to be a refractory paint, and a material other than the refractory paint such as a fireproof coating may be adopted.

Further, the present invention can be configured by combining the members in the respective refractory woods 10 and 10A to 10F shown in FIGS. 1 to 9. The present invention includes various embodiments not described above, and the technical scope of the present invention is defined only by the matters specifying the invention in the scope of claims appropriate from the above description.

10, 10A to 10F Fireproof wood 12 Core material 14A to 14E Heat buffer material 16 Lath net 18A, 18A1 Fireproof material 18B, 18B1 Fireproof material 18C Fireproof material 20 Finishing material 22 Fastening member 22

Claims (3)

A prismatic heartwood made of wood,
A thermal shock absorber attached to a corner of the core material;
A refractory material attached to the outer surface side of the core material,
A finishing material which is supported by the thermal buffer material and covers the refractory material and the thermal buffer material,
Fire resistant wood with. The heat buffer material is a steel material, an air layer is formed inside,
The fireproof wood according to claim 1, wherein the finishing material is attached to the heat cushioning material by a fastening member having a tip located in the air layer. A lath net as a base material for supporting the refractory material is attached to the outer surface side of the core material,
The fireproof wood according to claim 1 or 2, wherein the fireproof material is a foamable fireproof coating film applied to the lath net.