Refractory wood construction

Abstract

To provide a fire-resistant timber structure that allows for the use of exposed CLT (Cross-Laminated Timber). [Solution] The invention comprises a plate-shaped main body 100 constructed by stacking multiple plate-shaped parallel layers 120, each formed from multiple pieces of wood with the fiber direction of the wood being substantially parallel to the longitudinal direction Y, and plate-shaped orthogonal layers 130, each formed from multiple pieces of wood with the fiber direction of the wood being substantially perpendicular to the longitudinal direction Y, in the thickness direction Z, and a piping 200 through which a refrigerant flows, located inside the main body 100.

Description

Technical Field

[0001] The present invention relates to a fire-resistant wood structure.

Background Art

[0002] In the construction field, the use of wood is being promoted for the purpose of effectively utilizing forest resources and fixing carbon dioxide. In particular, cross-laminated timber (hereinafter referred to as "CLT") having excellent strength and sound insulation is widely used as a structure. In addition, a construction method (hereinafter referred to as "exposed") in which wood is adopted for a structure and the structure is exposed without using a finishing material or the like is known as an effective method from the viewpoints of conditioning performance and design.

[0003] On the other hand, a structure in the construction field is required to have a self-extinguishing combustion performance, that is, a fire extinguishing performance, in accordance with the fire resistance performance standards defined by the Building Standards Law. Therefore, conventionally, when wood is adopted for a structure, fire resistance is ensured by measures such as coating with a fire-retardant material or using a composite material with a fire-retardant material.

[0004] For example, Patent Document 1 ensures fire resistance by a composite material in which wood is laminated on the surface of a cement composition.

[0005] Also, for example, Patent Document 2 ensures fire resistance by a wooden structure provided with a non-combustible coating on the surface.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, in order to use CLT as an exposed material, it is not possible to cover it with flame retardants or to create composite materials with flame retardants. Therefore, conventional technology has the problem of not being able to guarantee the fire resistance performance required for the exposed use of CLT.

[0008] The present invention aims to provide a fire-resistant timber structure that can utilize CLT (Cross-Laminated Timber) in an exposed state. [Means for solving the problem]

[0009] To achieve the above objectives, the present invention provides the following means. The fire-resistant wood structure of the present invention comprises a plate-shaped main body constructed by laminating multiple plate-shaped parallel layers formed from multiple pieces of wood, wherein the fiber direction of the wood is substantially parallel to the longitudinal direction, and plate-shaped orthogonal layers formed from multiple pieces of wood, wherein the fiber direction of the wood is substantially perpendicular to the longitudinal direction, in the thickness direction, and piping through which a refrigerant flows, arranged inside the main body.

[0010] In the fire-resistant wood structure of the present invention, the main body comprises a plurality of pipes, each pipe having a straight section extending parallel to the parallel layer inside the main body, and elbow sections positioned at both ends of the straight section, one end of which is connected to the straight section and the other end of which is positioned outside the main body. The end of the elbow portion, which is located on the outside of the main body, may be provided with a connecting joint.

[0011] In the fire-resistant wood structure of the present invention, the piping is connected to a fire-fighting water tank via the connecting joint, the fire-fighting water tank is equipped with a supply means for supplying the stored water stored inside as the refrigerant, the inside of the piping is arranged so that the stored water flows through the supply means, and the stored water may circulate between the main body and the fire-fighting water tank via the piping.

[0012] In the fire-resistant wood structure of the present invention, the main body comprises a laminated structure of three or more layers in the thickness direction, and the piping may be inserted into the interior of the orthogonal layers that are closest to the front and back planes of the laminated structure in the thickness direction.

[0013] In the fire-resistant wood structure of the present invention, the front surface and the back surface of the laminated structure may have the parallel layers arranged thereon.

[0014] In the fire-resistant wood structure of the present invention, the orthogonal layer through which the pipe is inserted has a concave pipe installation hole formed according to the position of the straight section, and when the pipe is placed in the pipe installation hole, adhesive is filled in and the opening of the hole in the concave upper part is closed with wood filler to fix the pipe in place.

[0015] In the fire-resistant wood structure of the present invention, the piping may be provided to bear a portion of the stress generated in the main body.

[0016] In the fire-resistant wooden structure of the present invention, the plurality of pipes are formed in a cylindrical shape with a diameter of 12.6 mm or more, and are arranged in parallel in the short direction of the main body such that the distance between the centers of the pipes is 25 mm or less, and the temperature of the water stored in the fire-fighting water tank may be 30 degrees or less. [Effects of the Invention]

[0017] According to the present invention, a fire-resistant timber structure can be provided in which CLT can be used as an exposed material. [Brief explanation of the drawing]

[0018] [Figure 1] A perspective view of a fire-resistant timber structure according to an embodiment of the present invention is shown. [Figure 2] This shows a cross-sectional view AA of a fire-resistant wood structure according to an embodiment of the present invention. [Figure 3] This shows a cross-sectional view of a fire-resistant timber structure according to an embodiment of the present invention. [Figure 4]The piping installation method of the fire-resistant wood structure according to the embodiment of the present invention is shown. [Figure 5] The result of the heat conduction analysis of the fire-resistant wood structure according to the embodiment of the present invention is shown. [Figure 6] The heating conditions of the heat conduction analysis of the fire-resistant wood structure according to the embodiment of the present invention are shown.

Mode for Carrying Out the Invention

[0019] The fire-resistant wood structure 1 of the present invention will be described with reference to FIGS. 1-6. FIG. 1 shows a perspective view of the fire-resistant wood structure 1 according to the embodiment. The fire-resistant wood structure 1 according to this embodiment is a floor material that constitutes the structure of a building. The fire-resistant wood structure 1 includes a plurality of pipes 200 inside the main body portion 100. In the embodiment, the short side direction of the fire-resistant wood structure 1 is defined as the width direction X, the long side direction is defined as the depth direction (long side direction) Y, and the thickness direction is defined as the height direction (thickness direction) Z.

[0020] The main body portion 100 is a plate-shaped CLT (laminated structure) 110 constructed in multiple layers. The main body portion 100 has a front side plane 101 and a back side plane 102 orthogonal to the height direction Z, a longitudinal side surface 103 orthogonal to the width direction X, and a short side surface 104 orthogonal to the depth direction Y.

[0021] The CLT 110 is formed from a plurality of woods and has plate-shaped parallel layers 120 provided such that the fiber direction of the woods is substantially parallel to the depth direction Y. Further, the CLT 110 is formed from a plurality of woods and has plate-shaped orthogonal layers 130 provided such that the fiber direction of the woods is substantially parallel to the width direction X. The CLT 110 is alternately arranged in the height direction Z so that the planes of the four parallel layers 120 and the three orthogonal layers 130 are aligned, and each is joined to form the CLT 110. Therefore, the front side plane 101 and the back side plane 102 are provided with the parallel layers 120.

[0022] The pipe 200 is a cylindrical member formed from a steel member. The pipe 200 has a straight section 201 that extends parallel to the longitudinal direction. The pipe 200 also has elbow sections 202 that are located on the outside of the main body 100. The elbow sections 202 are arranged mainly toward the front plane 101, approximately perpendicular to the straight section 201. An elbow section 202, located on the outside of the main body 100, has a connecting joint 203 at one end. The connecting joint 203 is a steel joint that allows for the connection of a pipe 200.

[0023] Figure 2 shows a cross-sectional view AA of the fire-resistant timber structure 1 according to the embodiment. Multiple pipes 200 are arranged such that their straight sections 201 are inserted into the orthogonal layer 130 closest to the front plane 101 and the orthogonal layer 130 closest to the back plane 102, respectively.

[0024] The orthogonal layer 130 has pipe installation holes 210 formed therein. The pipe installation holes 210 are formed in a recessed shape on one of the planes of the orthogonal layer 130. The pipe installation hole 210 is formed to be slightly larger than the cross-section of the pipe 200.

[0025] The piping 200 is connected to the water storage route 301 via a connecting fitting 203. The water storage route 301 is a steel transport pipe with one end connected to the fire-fighting water tank 300. The fire-fighting water tank 300 is a fire-fighting system in a building that has the function of storing rainwater, etc., as stored water 302. The fire-fighting water tank 300 is equipped with a supply means 303 for supplying the stored water 302 to the water storage route 301. The stored water is water stored in the fire-fighting water tank 300 and is kept at a temperature of 30 degrees Celsius or lower.

[0026] One end of the piping 200 is supplied with stored water 302 via a stored water passage 301 by a supply means 303. The supply means 303 is, for example, a liquid transport machine such as a pump. Inside the piping 200, the stored water 302 flows from one end to the other. The other end of the piping 200 discharges the stored water 302 to the fire-fighting water tank 300 via the stored water passage 301. The stored water 302 is arranged to circulate between the fire-fighting water tank 300 and the inside of the main body 100 via the piping 200 and the stored water path 301.

[0027] Figure 3 shows a cross-sectional view of the fire-resistant timber structure 1 according to the embodiment. The piping 200 is cylindrical in shape with a diameter of 12.6 mm or more, so that a certain amount or more of stored water 302 can flow through it.

[0028] Multiple pipes 200 are arranged such that the center of the straight section 201 in the height direction Z is approximately the same as the center of the orthogonal layer 130. Furthermore, the multiple pipes 200 are arranged in parallel at equal intervals in the width direction X in the orthogonal layer 130 located closest to the front plane 101. Similarly, the multiple pipes 200 are arranged in parallel at equal intervals in the width direction X in the orthogonal layer 130 located closest to the back plane 102. In the width direction X, the spacing between the multiple pipes 200 is set such that the distance between the centers of the pipes 200 is 25 mm or less.

[0029] Figure 4 shows the method for installing the piping 200 in the fire-resistant wooden structure 1 according to the embodiment. Figure 4(a) shows the hole processing for the pipe installation location. The orthogonal layer 130 has a recessed pipe installation hole 210 formed on one side of the orthogonal layer plane 131. The pipe installation hole 210 has an opening 211 at the top and a bottom 212 at the bottom. The opening 211 has a shape that is slightly larger than the straight section in the depth direction Y. Also, the opening 211 is formed to be slightly larger than the diameter of the cylindrical shape of the straight section 201 in the width direction X. The bottom portion 212 of the hole is formed to be approximately the same shape as the cylindrical shape of the straight portion 201, but slightly larger. Therefore, the pipe installation hole 210 is provided so that a straight section 201 can be placed inside it.

[0030] Figure 4(b) shows the method of fixing the pipe 200 to the orthogonal layer 130 at the pipe installation location. Figure 4(b) is the next step in the installation method of pipe 200 as shown in Figure 4(a). The straight section 201 is placed inside the pipe installation hole 210. With the straight section 201 placed inside the pipe installation hole 210, adhesive 220 is filled in. The adhesive 220 is, for example, an epoxy resin-based adhesive that is applicable to metals. The adhesive 220 is filled so as to cover at least the entire surface of the straight section 201.

[0031] Figure 4(c) shows the method for closing the pipe installation hole 210 at the pipe installation location. Figure 4(c) is the next step in the pipe installation method for pipe 200, following Figure 4(b). The pipe installation hole 210 has a straight section 201 inside and is filled with adhesive 220. Before the adhesive 220 hardens, it is sealed with a wood filler 230. The wood filler 230 is a repair material made from the same type of wood as the orthogonal layer 130. The wood filler 230 is arranged so that its fiber direction is approximately parallel to the fiber direction of the orthogonal layer 130. The wood filler 230 is formed to a length that does not interfere with the pipe 200 in the depth direction Y. In addition, the wood filler 230 is formed in a rectangular shape in the width direction X that is approximately the same size as the opening 211 of the pipe installation hole 210. The wood filler 230 has an outer surface 231 and an inner surface 232 that are approximately parallel to the orthogonal layer plane 131. The wood filler 230 is inserted into the pipe installation hole 210 such that the outer surface 231 of the wood filler is at approximately the same height as the orthogonal layer plane 131. At this time, the wood filler 230 is formed to a thickness such that the inner surface 232 of the wood filler does not come into contact with the pipe 200. The adhesive 220 discharged from the pipe installation hole 210 as the wood filler 230 is inserted is removed before it hardens.

[0032] Figure 4(d) shows the method for forming the CLT110 at the piping installation site. Figure 4(d) is the next step in the installation method of the piping 200, following Figure 4(c). The orthogonal layer plane 131 of the orthogonal layer 130, which is fixed to the piping 200, is positioned to align with the parallel layer plane 121 of the parallel layer 120. The orthogonal layer plane 131 and the parallel layer plane 121 are joined together, for example, by applying an isocyanate-based bonding agent and then applying pressure in the height direction Z, thereby forming the CLT 110. Since the piping 200 is in contact with the orthogonal layer 130 via the adhesive 220, it is provided to bear a portion of the stress generated in the main body 100.

[0033] Therefore, it has been shown that a CLT110 with internal piping 200 can be formed by the method shown in Figures 4(a) to 4(d).

[0034] Figure 5 shows the results of the heat conduction analysis of the fire-resistant wood structure 1 according to the embodiment. Figure 6 shows the heating conditions for the heat conduction analysis of the fire-resistant wood structure according to the embodiment. Figures 5(a) and 5(b) show the temperature distributions resulting from heat conduction analyses performed under similar conditions for different test specimen models 400. The heating conditions in Figure 5 followed the temperature conditions inside the refractory furnace in the standard heating test specified by ISO standards, with the lower part of the test specimen model heated for 60 minutes in the temperature-time relationship shown in Figure 6, followed by cooling in the furnace. Furthermore, since wood generally undergoes thermal decomposition when its temperature exceeds 200 degrees Celsius, the areas in the temperature distribution shown in Figure 5 that exceed 200 degrees Celsius are defined as having been burned.

[0035] Figure 5(a) shows the results of a thermal conduction analysis performed on CLT110 without a water cooling function via piping 200, which was used as test specimen model 400a. Figure 5(b) shows the results of a thermal conduction analysis performed on CLT110 in the fire-resistant wood structure 1 of the embodiment, which has internal piping 200 and a water cooling function, using the test specimen model 400b. The upper figures in Figures 5(a) and 5(b) show the temperature distribution of the test specimen model 400 immediately after heating its heating surface 410 for 60 minutes; this is the 60-minute temperature distribution 510. The lower figures in Figures 5(a) and 5(b) show the temperature distribution of the test specimen model after heating its heating surface 410 for 60 minutes, then stopping the heating, and allowing another 30 minutes to pass; this is the 90-minute temperature distribution 520.

[0036] In Figure 5(a), the upper figure shows the 60-minute temperature distribution 510a of test specimen model 400a, and the lower figure shows the 90-minute temperature distribution 520a of test specimen model 400a. From the 60-minute temperature distribution of test specimen model 400a (510a), it can be seen that the majority of test specimen model 400a is burning. Furthermore, the 90-minute temperature distribution 520a of test specimen model 400a shows that the combustion region expands toward the opposite side of the heated surface 410 compared to the 60-minute temperature distribution 510a of test specimen model 400a. Therefore, it can be seen that combustion is progressing more rapidly than in the 90-minute temperature distribution 520a. Therefore, it is clear that CLT110 without a water cooling function via piping 200 has low fire resistance and lacks fire-stopping properties.

[0037] In Figure 5(b), the upper figure shows the 60-minute temperature distribution 510b of test specimen model 400b, and the lower figure shows the 90-minute temperature distribution 520b of test specimen model 400b. From the 60-minute temperature distribution 510b of test specimen model 400b, it can be seen that combustion occurred in the region between the heated surface 410 and the pipe 200, but not in the region above the pipe 200. Furthermore, the 90-minute temperature distribution 520b for test specimen model 400b shows that the combustion region does not expand as much as the 60-minute temperature distribution 510b for test specimen model 400b, and the temperature is lower. Therefore, it can be seen that the combustion is more converged in the 90-minute temperature distribution 520b. Therefore, it can be seen that the CLT110 in the fire-resistant wood structure 1 of the embodiment, which has internal piping 200 and a water cooling function, has significantly higher fire resistance and fire-stopping performance.

[0038] Therefore, it was shown that the fire-resistant wood structure 1 of the embodiment has internal piping 200 through which stored water 302 flows, and is equipped with a water cooling function to ensure fire resistance.

[0039] As described above, the fire-resistant wood structure 1 according to this embodiment is equipped with a plurality of pipes 200 inside the main body 100. The main body 100 is a multi-layered, plate-shaped CLT 110. The CLT 110 has plate-shaped parallel layers 120 formed from a plurality of woods, with the wood fiber direction being substantially parallel to the depth direction Y. The CLT 110 also has plate-shaped orthogonal layers 130 formed from a plurality of woods, with the wood fiber direction being substantially parallel to the width direction X. One end of the pipe 200 is supplied with stored water 302 by a supply means 303 via a stored water path 301. Stored water 302 flows inside the pipe 200 from one end to the other. The fire-resistant wood structure 1 is provided with a water cooling function by having pipes 200 through which stored water 302 flows, thereby ensuring fire resistance. Therefore, the fire-resistant wood structure 1 can ensure fire resistance without using special woods such as those coated with flame-retardant materials or composite materials with flame-retardant materials. For this reason, the fire-resistant wood structure 1 can utilize CLT110 in its exposed state.

[0040] In the fire-resistant wooden structure 1 according to this embodiment, the piping 200 has a straight section 201 that extends parallel to the longitudinal direction. The piping 200 also has an elbow section 202 located on the outside of the main body 100. The elbow sections 202 are arranged mainly toward the front plane 101, approximately perpendicular to the straight section 201. A connecting joint 203 is provided at one end of the elbow section 202 located on the outside of the main body 100. The connecting joint 203 is a steel joint provided to connect the piping 200. Therefore, the fire-resistant wood structure 1 can circulate a large amount of refrigerant. As a result, the fire-resistant wood structure 1 can have more suitable cooling performance.

[0041] In the fire-resistant wooden structure 1 according to this embodiment, the piping 200 is connected to the water storage path 301 via a connecting joint 203. The fire-fighting water tank 300 is equipped with a supply means 303 for supplying stored water 302 to the water storage path 301. One end of the piping 200 is supplied with stored water 302 by the supply means 303 via the water storage path 301. The other end of the piping 200 discharges the stored water 302 to the fire-fighting water tank 300 via the water storage path 301. The stored water 302 is arranged to circulate between the fire-fighting water tank 300 and the inside of the main body 100 via the piping 200 and the water storage path 301. Therefore, the fire-resistant timber structure 1 is supplied with stored water 302 through a supply means 303 provided in the building's fire-fighting equipment. As a result, the fire-resistant timber structure 1 can be easily introduced by utilizing the existing fire-fighting equipment.

[0042] In the fire-resistant timber structure 1 according to this embodiment, the CLT 110 is formed by alternately arranging parallel layers 120 and orthogonal layers 130 so that their planes align in the height direction Z, and then joining them together. The multiple pipes 200 are arranged so that their straight sections 201 are inserted through the orthogonal layer 130 closest to the front plane 101 and the orthogonal layer 130 closest to the back plane 102, respectively. Therefore, the fire-resistant wood structure 1 is equipped with piping 200 that is perpendicular to the fiber direction while circulating a coolant near the surface. As a result, the fire-resistant wood structure 1 can have suitable cooling performance while ensuring rigidity.

[0043] In the fire-resistant timber structure 1 according to this embodiment, the CLT 110 is formed by alternately arranging four parallel layers 120 and three orthogonal layers 130 so that their planes align in the height direction Z, and then joining them together. The front plane 101 and the back plane 102 are made up of parallel layers 120. Therefore, the surface of the CLT110 in the fire-resistant wood structure 1 exposes the parallel fiber direction. As a result, the fire-resistant wood structure 1 has high aesthetic appeal.

[0044] In the fire-resistant wood structure 1 according to this embodiment, the orthogonal layer 130 has a recessed pipe installation hole 210 formed on one side of the orthogonal layer plane 131. The pipe installation hole 210 is provided so that a straight section 201 can be placed inside. With the straight section 201 placed inside the pipe installation hole 210, adhesive 220 is filled in. Then, with the straight section 201 placed inside, the pipe installation hole 210 is filled with adhesive 220, and before the adhesive 220 has hardened, it is closed with a wood filler 230. The wood filler 230 is inserted into the pipe installation hole 210 such that the outer surface 231 of the wood filler 230 is at approximately the same height as the orthogonal layer plane 131. The adhesive 220 discharged from the pipe installation hole 210 upon insertion of the wood filler 230 is removed before it hardens. Then, the orthogonal layer plane 131 of the orthogonal layer 130, which is fixed to the piping 200, is positioned to align with the parallel layer plane 121 of the parallel layer 120. The orthogonal layer plane 131 and the parallel layer plane 121 are joined together, for example, by applying an isocyanate-based bonding agent and then applying pressure in the height direction Z, thereby forming the CLT 110. Therefore, the fire-resistant wooden structure 1 can be suitably equipped with piping 200 inside by a simple method of filling the piping installation hole 210 with adhesive 220.

[0045] In the fire-resistant wood structure 1 according to this embodiment, the pipes 200 are in contact with the orthogonal layer 130 via the adhesive 220, and are therefore provided to bear a portion of the stress generated in the main body 100. Therefore, the fire-resistant timber structure 1 can have suitable rigidity.

[0046] In the fire-resistant wood structure 1 according to this embodiment, the stored water 302 is cooling water stored in a fire-fighting water tank 300 and is kept at a temperature of 30 degrees Celsius or lower. The pipes 200 are cylindrical in shape with a diameter of 12.6 mm or more, so that a certain amount or more of the stored water 302 can be circulated. The spacing between the multiple pipes 200 in the width direction X is set so that the distance between the centers of the pipes 200 is 25 mm or less. From Figure 5(b), it can be seen that the CLT 110 in the fire-resistant wood structure 1 of this embodiment, which has pipes 200 inside and is equipped with a water cooling function, has superior fire resistance and fire-stopping performance. Therefore, with the cooling equipment configuration shown in this embodiment, the fire-resistant timber structure 1 can ensure that the fire resistance performance standards stipulated in the Building Standards Act are met.

[0047] Although embodiments of the fire-resistant wood structure 1 according to the present invention have been described above, the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit of the invention.

[0048] In the present invention, the fire-resistant wood structure 1 may be used as a structural member other than a flooring material. For example, the fire-resistant timber structure 1 may be a load-bearing wall. In this case as well, since fire resistance is guaranteed and it has fire-stopping properties, it can be used as a component that meets the fire resistance performance standards stipulated in the Building Standards Act.

[0049] In the present invention, the fire-resistant wood structure 1 may be used for purposes other than structural members. For example, the fire-resistant wood structure 1 may be used as an interior finishing material. In this case as well, since fire resistance is guaranteed and it has fire-stopping properties, it contributes to improving the fire resistance of the building.

[0050] In the present invention, the fire-resistant wood structure 1 may have piping 200 only in the orthogonal layer 130 closest to either the front surface 101 or the back surface 102. Furthermore, the fire-resistant wood structure 1 may use special wood such as a coating with a flame retardant or a composite material with a flame retardant. For example, in the fire-resistant timber structure 1, only the front surface 101 is used as an exposed member. In this case, the piping 200 may be located only in the orthogonal layer 130 closest to the front surface 101. Since the back surface 102 is not used as an exposed member, its fire resistance may be ensured by covering it with a flame-retardant material. As described above, the fire-resistant timber structure 1 can be used as a component for various applications.

[0051] In the present invention, the pipe installation hole 210 may be closed without using the wood filler 230. For example, the pipe installation hole 210 may be closed by the surface of the overlapping parallel layers 120.

[0052] In the present invention, the refrigerant may be something other than the stored water 302, and may be supplied from a source other than the fire-fighting water tank 300. For example, the refrigerant may be carbon dioxide, which has a low environmental impact and low flammability. In that case, the refrigerant is supplied to the piping 200 by a compressor. Both ends of the piping 200 are connected to the compressor and are configured to allow the refrigerant to circulate.

[0053] In the present invention, the pipe 200 does not have to be made of steel, as long as it is made of a material that can withstand the combustion temperature of wood. For example, it may be made from a highly heat-resistant non-ferrous metal, or from a super heat-resistant resin.

[0054] In the present invention, the piping 200 does not need to be in contact with the orthogonal layer 130, nor does it need to be provided in such a way as to bear the stress on the main body 100, provided that the fire-resistant wood structure 1 can maintain its rigidity. Furthermore, the piping 200 may be provided in the parallel layer 120. For example, the fire-resistant wood structure 1 is formed from nine or more layers of CLT 110. In this case, since the fire-resistant wood structure 1 has high rigidity, the pipes 200 may be inserted into the pipe installation holes 210 formed in the parallel layers 120 without being filled with adhesive 220. In this case, the pipes 200 do not come into contact with the main body 100 and do not bear any stress.

[0055] In the present invention, the pipes 200 do not need to be formed in a cylindrical shape with a diameter of 12.6 mm or more, as long as they can meet the fire resistance performance standards stipulated in the Building Standards Act, and they do not need to be arranged in parallel so that the distance between the centers of the cylindrical shapes is 25 mm or less. For example, in cases where the refrigerant temperature is low and high cooling efficiency is ensured, the piping 200 may meet the fire resistance performance standards stipulated in the Building Standards Act by having a diameter of 12.6 mm or more and arranging the cylindrical sections with a distance of 25 mm or more between their centers.

[0056] In the present invention, the refrigerant temperature of the piping 200 does not need to be 30 degrees Celsius or lower, as long as it can meet the fire resistance performance standards stipulated in the Building Standards Act. For example, if the piping 200 is densely arranged and high cooling efficiency is ensured, the fire resistance performance standards stipulated in the Building Standards Act may be met by using a refrigerant at a temperature higher than 30 degrees.

[0057] In the present invention, the stored water 302 may be cooled by a cooling device. For example, the fire-fighting water tank 300 may have a cooling means for cooling the stored water 302. In that case, the stored water 302 stored in the fire-fighting water tank 300 will be cooled to 30 degrees Celsius or lower by the cooling means when its temperature exceeds 30 degrees Celsius in summer or other environmental conditions. As described above, the fire-resistant timber structure 1 is not limited in its composition as long as its rigidity and fire resistance can be ensured.

[0058] In the present invention, the installation position of the elbow portion 202 is not limited. For example, the elbow portions 202 may be arranged so as to be approximately perpendicular to the straight portions 201 toward the back plane 102, or they may be arranged so as to be approximately perpendicular to the straight portions 201 toward the nearest plane. Alternatively, the elbow portion 202 may be located inside the main body portion 100. In that case, through holes are formed in the front and back surfaces, and only one end of the elbow portion 202 is positioned outside the main body portion 100 and connected to the water storage path 301.

[0059] In this invention, the pipe 200 does not necessarily have to have an elbow section 202. Also, the straight section of the pipe 200 may be curved. For example, a connecting joint 203 may be provided at the end of the straight section 201 and connected to the water storage path 301. In this case, the end of the straight section 201 may be curved to adjust the connection position with the water storage path 301.

[0060] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the UN Summit in September 2015. The fire-resistant timber structure 1 according to this embodiment can contribute to achieving some of the 17 SDGs, such as Goal 9, "Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation." [Explanation of Symbols]

[0061] 1 Fireproof wood construction Y: Depth direction (long side direction) Z (height direction / thickness direction) 100 Main body 101 Front plane 102 Back side plane 110 CLT (Laminated Tissue) 120 parallel layers 130 orthogonal layers 200 piping 201 Straight section 202 Elbow section 203 Connecting fittings 210 Pipe installation hole 211 Hole opening 220 Adhesive 230 Wood inlay 300 Fire protection water tank 302 Stored water 303 Supply means

Claims

1. A plate-like parallel layer formed from multiple pieces of wood, wherein the fiber direction of the wood is substantially parallel to the longitudinal direction, A plate-like orthogonal layer, formed from multiple pieces of wood, is provided such that the fiber direction of the wood is approximately perpendicular to the longitudinal direction. A plate-like main body constructed by stacking multiple layers in the thickness direction, The main body includes a pipe through which a refrigerant flows, Fireproof wood construction.

2. The main body comprises a plurality of the aforementioned pipes, The aforementioned piping has a straight section that extends parallel to the parallel layer inside the main body, It has elbow portions located at both ends of the straight section and on the outside of the main body, The end of the elbow portion, which is located on the outside of the main body, is provided with a connecting joint. The fire-resistant wood structure according to claim 1.

3. The aforementioned piping is connected to the fire-fighting water tank via the aforementioned connecting fitting. The fire-fighting water tank is equipped with a supply means for supplying the stored water inside as the refrigerant. The inside of the aforementioned piping is provided so that the stored water can flow through it by the supply means. The stored water circulates between the main body and the fire-fighting water tank via the piping. The fire-resistant wood structure according to claim 2.

4. The main body has a laminated structure of three or more layers in the thickness direction, The aforementioned piping is inserted in the thickness direction into the interior of the orthogonal layer that is closest to the front and back planes of the laminated structure, respectively. The fire-resistant wood structure according to claim 1.

5. The front and back surfaces of the laminated structure are arranged such that the parallel layers are placed on them. The fire-resistant wood structure according to claim 4.

6. The orthogonal layer through which the aforementioned piping is inserted is It has a concave pipe installation hole formed according to the position of the straight section, With the pipe positioned in the pipe installation hole, the adhesive is filled in. The hole opening at the concave upper part is sealed with wood filler, thereby fixing the pipe in place. The fire-resistant wood structure according to claim 3.

7. The aforementioned piping is provided to bear a portion of the stress generated in the main body, The fire-resistant wood structure according to claim 1.

8. Multiple of the aforementioned pipes are formed in a cylindrical shape with a diameter of 12.6 mm or more. In the shorter direction of the main body, the pipes are arranged in parallel such that the distance between their centers is 25 mm or less. The temperature of the water stored in the fire-fighting water tank is 30 degrees Celsius or lower. The fire-resistant wood structure according to claim 6.

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