Lumber

Abstract

To provide fire-resistant building lumber that excels in carbon dioxide emission suppression effect and recycling performance.SOLUTION: Building lumber comprises a finished surface and a flow passage for fire resistance, wherein the flow passage for fire resistance has: an introduction port; a hollow parallel flow passage in communication with the introduction port and extending parallel to the finished surface; and a discharge port in communication with the parallel flow passage and opening to the finished surface. This structure allows water introduced from the introduction port upon a fire to be discharged from the discharge port through the parallel flow passage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to building timber. [Background technology]

[0002] Fire-resistant building timber is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-208353 A Summary of the Invention [Problem to be solved by the invention]

[0004] It is preferable that the wood for construction has excellent carbon dioxide emission suppression effect and recyclability.

[0005] Therefore, an object of the present invention is to provide a building timber material that is excellent in the effect of reducing carbon dioxide emissions, is recyclable, and has fire resistance. [Means for solving the problem]

[0006] One aspect of the present invention is as follows.

[0007] [1] A finished surface and a refractory flow passage; The fire-resistant flow path has an inlet, a hollow parallel flow path that is connected to the inlet and extends parallel to the finished surface, and an outlet that is connected to the parallel flow path and opens to the finished surface, and in the event of a fire, water passed through the inlet can be discharged from the outlet through the parallel flow path.

[0008] [2] The building timber described in [1] above is capable of retaining water flowing through the fire-resistant flow path.

[0009] [3] The building timber described in [2], wherein the finished surface can retain water flowing through the fire-resistant flow path.

[0010] [4] The building timber according to [2] or [3], which is capable of absorbing water flowing through the fire-resistant flow path through the surfaces of the parallel flow paths.

[0011] [5] The lumber for construction according to any one of [1] to [4], wherein the inlet is provided on the surface opposite to the finished surface or on the finished surface.

[0012] [6] The parallel flow paths have a plurality of first flow paths aligned along the finished surface, parallel to each other and extending parallel to the finished surface, and a flow path connection portion that connects all of the first flow paths to each other. The building timber described in any one of [1] to [5].

[0013] [7] The flow path connection portion has a second flow path that is aligned along the finished surface and extends parallel to the finished surface from one end to the other of the multiple first flow paths.

[0014] [8] The building timber described in [6] or [7], wherein the parallel flow paths have a group of outlets consisting of a plurality of the outlets aligned along the first flow paths, corresponding to each of the first flow paths.

[0015] [9] The parallel flow paths include a first flow path group consisting of a plurality of first flow paths aligned along the finishing surface, parallel to each other, and extending parallel to the finishing surface, the first flow path group having an inner end opening at the discharge port, and a second flow path group consisting of a plurality of second flow paths aligned along the finishing surface and extending parallel to the finishing surface from one end to the other of the plurality of first flow paths, A building timber as described in any one of [1] to [8], wherein at least one of the first flow paths has a water-retaining layer that protrudes closer to the finished surface than all of the second flow paths connected to the first flow path, or at least one of the second flow paths has a water-retaining layer that protrudes closer to the finished surface than all of the first flow paths connected to the second flow path.

[0016]

[10] The first flow path group has, as the first flow path, a first discharge flow path having the discharge outlet and no water-retaining layer as the first flow path, and a first water-retaining flow path having the water-retaining layer and no discharge outlet as the first flow path.The building wood described in [9].

[0017]

[11] The building wood described in [9] or

[10] , wherein the first flow path group has a first flow path for draining retained water, the first flow path having the retained water layer and the drain outlet.

[0018]

[12] The building timber according to any one of [9] to

[11] , wherein the second flow path group has a second water-retaining flow path having the water-retaining layer and no outlet as the second flow path.

[0019]

[13] The fire-resistant flow path has a second inlet, a hollow second parallel flow path that is connected to the second inlet and extends parallel to the finished surface on the opposite side of the finished surface or on the side of the finished surface relative to the parallel flow path, and a second exhaust outlet that is connected to the second parallel flow path and opens to the finished surface, and water passed through the second inlet in the event of a fire can be discharged from the second exhaust outlet through the second parallel flow path. The building wood described in any one of [9] to

[12] .

[0020]

[14] The building timber according to any one of [9] to

[13] , wherein the second inlet is provided on an outer surface of the building timber.

[0021]

[15] A plate having a groove that forms the parallel flow path, The building timber according to any one of [1] to

[14] , which is formed from lumber, laminated veneer lumber, plywood, laminated timber, cross-laminated timber, or any combination thereof.

[0022]

[16] A fire-resistant wood structure comprising the wood for construction according to any one of [1] to

[15] . Effect of the Invention

[0023] According to the present invention, it is possible to provide a building timber material that is excellent in the effect of reducing carbon dioxide emissions, is recyclable, and has fire resistance. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a front view of a building timber according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a top view of the building timber shown in FIG. [Diagram 3] FIG. 2 is a right side view showing the building timber shown in FIG. [Figure 4] FIG. 4 is a partially enlarged view of FIG. [Diagram 5] FIG. 4 is a front view of a building timber according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a top view of the building timber shown in FIG. 5. [Figure 7] FIG. 6 is a right side view showing the construction timber shown in FIG. 5. [Figure 8] FIG. 4 is a front view of a building timber according to a third embodiment of the present invention. [Figure 9] FIG. 9 is a top view of the building timber shown in FIG. 8. [Figure 10] FIG. 9 is a right side view showing the construction lumber shown in FIG. 8. [Figure 11] FIG. 11 is a front view of a building timber according to a fourth embodiment of the present invention. [Figure 12] FIG. 12 is a top view of the building timber shown in FIG. [Figure 13] FIG. 12 is a right side view showing the building timber shown in FIG. [Figure 14]FIG. 11 is a front view of a building timber according to a fifth embodiment of the present invention. [Figure 15] FIG. 15 is a top view of the building timber shown in FIG. 14. [Figure 16] FIG. 15 is a right side view showing the building timber shown in FIG. [Figure 17] FIG. 13 is a front view of a building timber according to a sixth embodiment of the present invention. [Figure 18] FIG. 18 is a top view of the building timber shown in FIG. 17. [Figure 19] 18 is a cross-sectional view of the building timber shown in FIG. 17 along the line AA. [Figure 20] 18 is a cross-sectional view of the building timber shown in FIG. 17 . [Figure 21] FIG. 13 is a front view of a building timber according to a seventh embodiment of the present invention. [Figure 22] FIG. 22 is a top view of the building timber shown in FIG. 21. [Figure 23] FIG. 22 is a right side view showing the building timber shown in FIG. 21. [Figure 24] FIG. 13 is a front view of a building timber according to an eighth embodiment of the present invention. [Diagram 25] FIG. 25 is a top view of the building timber shown in FIG. 24. [Figure 26] FIG. 25 is a right side view showing the building timber shown in FIG. 24. [Figure 27] FIG. 13 is a front view of a building timber according to a ninth embodiment of the present invention. [Figure 28] FIG. 28 is a top view of the building timber shown in FIG. 27. [Figure 29] 28 is a CC cross-sectional view of the building timber shown in FIG. 27. [Diagram 30] FIG. 28 is a DD cross-sectional view of the building timber shown in FIG. 27. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0026] First Embodiment As shown in Figures 1 to 4, in the first embodiment of the present invention, a building timber material 1 has a finished surface 2 and a fire resistance flow path 3, and the fire resistance flow path 3 has an inlet 4, a hollow parallel flow path 5 which communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a which communicates with the parallel flow path 5 and opens to the finished surface 2, so that in the event of a fire, water passed through the inlet 4 can be discharged from the outlet 6a through the parallel flow path 5.

[0027] According to the above configuration, in the event of a fire, water passed through the inlet 4 is discharged from the outlet 6a through the parallel flow paths 5, whereby the water discharged from the outlet 6a is vaporized by the heat of the fire, and the heat of vaporization can cool the finished surface 2. At that time, the finished surface 2 can also be cooled by the water flowing through the parallel flow paths 5 extending parallel to the finished surface 2. Therefore, a building timber 1 having fire resistance that is excellent in the effect of reducing carbon dioxide emissions and in reusability, compared to a case in which fire resistance, semi-fire resistance, or other fire resistance is imparted by applying or absorbing a fire-resistant agent, can be realized. The building timber 1 may be configured to exhibit fire resistance, such as non-combustible material, semi-non-combustible material, or flame-retardant material, in addition to fire resistance.

[0028] The building timber 1 can retain the water flowing through the fire resistance flow path 3. According to the above configuration, the water flowing through the fire resistance flow path 3 is retained in the building timber 1, thereby improving the fire resistance.

[0029] In the building timber 1, the finished surface 2 can retain the water flowing through the fire resistance flow path 3. According to the above-mentioned configuration, the water flowing through the fire resistance flow path 3 is retained on the finished surface 2, thereby improving the fire resistance.

[0030] The building timber 1 can absorb the water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5. According to the above configuration, the water flowing through the fire resistance flow path 3 is absorbed into the building timber 1 through the surfaces of the parallel flow paths 5, thereby improving the fire resistance.

[0031] The inlet 4 is provided on the surface 7 opposite the finished surface 2. With the above configuration, it is possible to reduce the need to provide the inlet 4 on the finished surface 2, making it easier to ensure the design of the finished surface 2. The inlet 4 may be provided on the finished surface 2. With the above configuration, it is possible to reduce the need to provide the inlet 4 on the surface 7 opposite the finished surface 2, making it easier to ensure the design of the surface 7 opposite the finished surface 2.

[0032] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2, are parallel to each other, and extend parallel to the finishing surface 2, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. According to the above configuration, the finishing surface 2 can be efficiently cooled by flowing water through the plurality of first flow paths 5a and the flow path connection portion 5b.

[0033] The flow passage connection portion 5b has second flow passages 5b1 that are aligned along the finishing surface 2 and extend from one end of the plurality of first flow passages 5a to the other in parallel with the finishing surface 2. According to the above configuration, the finishing surface 2 can be efficiently cooled by flowing water through the plurality of first flow passages 5a and the second flow passages 5b1.

[0034] The flow passage connection portion 5b has a plurality of second flow passages 5b1 aligned along the finishing surface 2. According to the above configuration, the finishing surface 2 can be efficiently cooled by flowing water through the plurality of first flow passages 5a and the plurality of second flow passages 5b1.

[0035] The parallel flow paths 5 have an outlet group 6 (see FIG. 4) consisting of a plurality of outlets 6a aligned along the first flow paths 5a corresponding to each of the first flow paths 5a. According to the above configuration, the finishing surface 2 can be efficiently cooled by discharging water from the outlet group 6. The above-mentioned plurality of outlets 6a can be configured to be aligned at equal intervals as shown in FIG. 4, for example. Note that the outlet group 6 is not shown in FIGS. 1 to 3.

[0036] The building timber 1 has a board 9 with grooves 8 that form parallel flow paths 5, and is formed from a laminated timber 10. With the above-mentioned configuration, the building timber 1 can be easily manufactured to a desired size. Instead of the laminated timber 10, the building timber 1 may be formed from an orthogonal laminated timber having laminas stacked in the same direction as the laminated timber 10.

[0037] The laminated lumber 10 is formed from the above-mentioned boards 9. According to the above-mentioned configuration, it is possible to more easily realize a building timber 1 having a finished surface 2 of a desired size.

[0038] The laminated lumber 10 is made up of a number of boards 9, each having a groove 8 that forms a parallel flow path 5. With the above-described configuration, it is easy to realize a building timber 1 having a finished surface 2 of a desired size that can be cooled efficiently.

[0039] The laminated lumber 10 is made up of the above-mentioned multiple plates 9, each having a groove 8 that forms the first flow path 5a and a through hole 11 that forms the second flow path 5b1. With the above-mentioned configuration, it is possible to easily realize a building lumber 1 having a finished surface 2 of a desired size that can be efficiently cooled by the above-mentioned multiple first flow paths 5a and second flow paths 5b1.

[0040] The laminated lumber 10 is made up of the plurality of plates 9, each having a groove 8 constituting the first flow passage 5a and a plurality of through holes 11 constituting the plurality of second flow passages 5b1. With the above configuration, it is possible to easily realize a building timber 1 of a desired size having a finished surface 2 that can be efficiently cooled by the plurality of first flow passages 5a and the plurality of second flow passages 5b1.

[0041] The building timber 1 has a plurality of first plugs 12 that plug the plurality of through holes 11 in the first board 9 that forms a first end of the building timber 1, and a plurality of second plugs 12 that plug the plurality of through holes 11 in the second board 9 that forms a second end of the building timber 1. With the above configuration, the plurality of second flow paths 5b1 that can efficiently cool the finishing surface 2 can be easily realized.

[0042] In this embodiment, the wood-based fireproof structure 13 includes building timber 1. With the above configuration, it is possible to realize a wood-based fireproof structure 13 that is excellent in terms of reducing carbon dioxide emissions and recyclability. Note that the fireproof structure 13 may be configured so that the building timber 1 provides fire resistance as well as non-combustibility.

[0043] <Second embodiment> As shown in Figures 5 to 7, in the second embodiment of the present invention, a building timber 1 has a finished surface 2 and a fire resistance flow path 3, and the fire resistance flow path 3 has an inlet 4, a hollow parallel flow path 5 that communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a that communicates with the parallel flow path 5 and opens to the finished surface 2, so that water passed through the inlet 4 in the event of a fire can be discharged from the outlet 6a through the parallel flow path 5.

[0044] The building timber 1 can retain water flowing through the fire resistance flow path 3. The building timber 1 can retain water flowing through the fire resistance flow path 3 at the finished surface 2. The building timber 1 can absorb water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5.

[0045] The inlet 4 is provided on the finishing surface 2. The inlet 4 may be provided on the surface 7 opposite to the finishing surface 2.

[0046] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 while being parallel to each other, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The flow path connection portion 5b has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0047] The parallel flow paths 5 have an outlet group 6 (see FIG. 7) made up of a plurality of outlets 6a aligned along the first flow paths 5a in correspondence with each of the first flow paths 5a. The plurality of outlets 6a may be configured to be aligned at equal intervals as shown in FIG. 7. The outlet group 6 is not shown in FIGS. 5 and 6.

[0048] The building timber 1 has a board 9 with grooves 8 that form parallel flow paths 5, and is formed from a laminated timber 10. Instead of the laminated timber 10, the building timber 1 may be formed from an orthogonal laminated timber having laminas stacked in the same direction as the laminated timber 10.

[0049] The laminated lumber 10 is formed from the above-mentioned boards 9. With the above-mentioned configuration, a building timber 1 of a desired size can be easily produced.

[0050] The board 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a. According to the above configuration, it is easy to realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a. The board 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a groove 8 constituting the second flow path 5b1. According to the above configuration, it is easy to realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a and the second flow path 5b1. The board 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a plurality of grooves 8 constituting the plurality of second flow paths 5b1. According to the above configuration, it is easy to realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a and the plurality of second flow paths 5b1.

[0051] In this embodiment, the wood fireproof structure 13 has a piece of building timber 1. The wood fireproof structure 13 has a plurality of pieces of building timber 1 joined together in a direction along a finished surface 2. With the above-mentioned configuration, a wood fireproof structure 13 having a finished surface 2 of a desired size can be easily realized.

[0052] <Third embodiment> As shown in Figures 8 to 10, in the third embodiment of the present invention, a building timber 1 has a finished surface 2 and a fire resistance flow path 3, and the fire resistance flow path 3 has an inlet 4, a hollow parallel flow path 5 that communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a that communicates with the parallel flow path 5 and opens to the finished surface 2, so that water passed through the inlet 4 in the event of a fire can be discharged from the outlet 6a through the parallel flow path 5.

[0053] The building timber 1 can retain water flowing through the fire resistance flow path 3. The building timber 1 can retain water flowing through the fire resistance flow path 3 at the finished surface 2. The building timber 1 can absorb water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5.

[0054] The inlet 4 is provided on the finishing surface 2. The inlet 4 may be provided on the surface 7 opposite to the finishing surface 2.

[0055] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 while being parallel to each other, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The flow path connection portion 5b has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0056] The parallel flow paths 5 have an outlet group 6 (see FIG. 10) made up of a plurality of outlets 6a aligned along the first flow paths 5a in correspondence with each of the first flow paths 5a. The plurality of outlets 6a may be configured to be aligned at equal intervals as shown in FIG. 10. The outlet group 6 is not shown in FIGS. 8 to 9.

[0057] The building timber 1 has boards 9 with grooves 8 that form parallel flow paths 5, and is formed from cross-laminated timber 14. The cross-laminated timber 14 is formed from the boards 9. Alternatively, the boards 9 as lumber may be joined to the cross-laminated timber 14. With the above-mentioned configuration, the building timber 1 can be easily produced in a desired size. The number of layers that form the cross-laminated timber 14 can be set as appropriate, and may be either an even number or an odd number.

[0058] The board 9 has grooves 8 that form part of the plurality of first flow paths 5a. With the above configuration, it is possible to easily realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a. The board 9 has a plurality of grooves 8 that form part of the plurality of first flow paths 5a. With the above configuration, it is even more possible to easily realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a.

[0059] The board 9 has grooves 8 constituting a part of the plurality of first flow paths 5a and grooves 8 constituting the second flow paths 5b1. With the above configuration, it is easy to realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a and the second flow paths 5b1. The board 9 has grooves 8 constituting a part of the plurality of first flow paths 5a and grooves 8 constituting the plurality of second flow paths 5b1. With the above configuration, it is easy to realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a and the plurality of second flow paths 5b1.

[0060] The board 9 has a plurality of grooves 8 constituting a part of the plurality of first flow paths 5a and a groove 8 constituting the second flow path 5b1. With the above configuration, it is possible to more easily realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a and the second flow paths 5b1. The board 9 has a plurality of grooves 8 constituting a part of the plurality of first flow paths 5a and a plurality of grooves 8 constituting the plurality of second flow paths 5b1. With the above configuration, it is possible to more easily realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a and the plurality of second flow paths 5b1.

[0061] The board 9 has an inlet 4. According to the above-mentioned configuration, the finishing surface 2 can be cooled more efficiently by utilizing the multiple inlets 4 formed in the building timber 1.

[0062] In this embodiment, the fireproof wooden structure 13 has wooden construction pieces 1 .

[0063] <Fourth embodiment> As shown in Figures 11 to 13, in the fourth embodiment of the present invention, a building timber 1 has a finished surface 2 and a fire resistance flow path 3, and the fire resistance flow path 3 has an inlet 4, a hollow parallel flow path 5 that communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a that communicates with the parallel flow path 5 and opens to the finished surface 2, so that water passed through the inlet 4 in the event of a fire can be discharged from the outlet 6a through the parallel flow path 5.

[0064] The building timber 1 can retain water flowing through the fire resistance flow path 3. The building timber 1 can retain water flowing through the fire resistance flow path 3 at the finished surface 2. The building timber 1 can absorb water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5.

[0065] The inlet 4 is provided on the surface 7 opposite to the finishing surface 2. The inlet 4 may be configured to be provided on the finishing surface 2.

[0066] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 while being parallel to each other, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The flow path connection portion 5b has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0067] The parallel flow paths 5 have an outlet group 6 (see FIG. 13) made up of a plurality of outlets 6a aligned along the first flow paths 5a in correspondence with each of the first flow paths 5a. The plurality of outlets 6a may be configured to be aligned at equal intervals as shown in FIG. 13. The outlet group 6 is not shown in FIGS. 11 and 12.

[0068] The building timber 1 has first and second layer boards 9 each having a groove 8 forming a parallel flow path 5, and is formed from a cross-laminated timber 14. The cross-laminated timber 14 is formed from the boards 9. Instead of such a configuration, the boards 9 as lumber may be joined to the cross-laminated timber 14.

[0069] The first layer plate 9 has grooves 8 which form part of the first flow paths 5a. The first layer plate 9 has grooves 8 which form part of the first flow paths 5a.

[0070] The first layer board 9 has grooves 8 that form part of the plurality of first flow paths 5a, and the second layer board 9 has grooves 8 that form the second flow paths 5b1. With the above configuration, it is possible to easily realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a and the second flow paths 5b1.

[0071] The board 9 has a plurality of grooves 8 that form part of the plurality of first flow paths 5a, and the second layer board 9 has grooves 8 that form the second flow paths 5b1. With the above configuration, it is possible to more easily realize a building timber 1 having a finished surface 2 that can be efficiently cooled by the plurality of first flow paths 5a and the second flow paths 5b1.

[0072] In this embodiment, the fireproof wooden structure 13 has wooden construction pieces 1 .

[0073] <Fifth embodiment> As shown in Figures 14 to 16, in the fifth embodiment of the present invention, a building timber 1 has a finished surface 2 and a fire-resistant flow path 3, and the fire-resistant flow path 3 has an inlet 4, a hollow parallel flow path 5 that communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a that communicates with the parallel flow path 5 and opens to the finished surface 2, so that water passed through the inlet 4 in the event of a fire can be discharged from the outlet 6a through the parallel flow path 5.

[0074] The building timber 1 can retain water flowing through the fire resistance flow path 3. The building timber 1 can retain water flowing through the fire resistance flow path 3 at the finished surface 2. The building timber 1 can absorb water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5.

[0075] The inlet 4 is provided on the finishing surface 2. The inlet 4 may be provided on the surface 7 opposite to the finishing surface 2.

[0076] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 while being parallel to each other, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The flow path connection portion 5b has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0077] The parallel flow paths 5 have an outlet group 6 (see FIG. 16) made up of a plurality of outlets 6a aligned along the first flow paths 5a in correspondence with each of the first flow paths 5a. The plurality of outlets 6a may be configured to be aligned at equal intervals as shown in FIG. 16. The outlet group 6 is not shown in FIGS. 14 and 15.

[0078] The building timber 1 has a board 9 with grooves 8 that form parallel flow paths 5, and is formed from a laminated timber 10. The board 9, as a sawn piece of lumber, is joined to the laminated timber 10. With the above-mentioned configuration, the building timber 1 can be easily manufactured to a desired size. Instead of the laminated timber 10, the building timber 1 may be formed from an orthogonal laminated timber having laminas stacked in the same direction as the laminated timber 10.

[0079] The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a. The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a groove 8 constituting the second flow path 5b1. The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a plurality of grooves 8 constituting the plurality of second flow paths 5b1.

[0080] In this embodiment, the fire-resistant wooden structure 13 has a piece of timber for construction 1. The fire-resistant wooden structure 13 has a plurality of pieces of timber for construction 1 arranged in a direction along a finished surface 2 and joined together.

[0081] Sixth embodiment As shown in Figures 17 to 20, in the sixth embodiment of the present invention, a building timber 1 has a finished surface 2 and a fire resistance flow path 3, and the fire resistance flow path 3 has an inlet 4, a hollow parallel flow path 5 which communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a which communicates with the parallel flow path 5 and opens to the finished surface 2, so that water passed through the inlet 4 in the event of a fire can be discharged from the outlet 6a through the parallel flow path 5.

[0082] The building timber 1 can retain water flowing through the fire resistance flow path 3. The building timber 1 can retain water flowing through the fire resistance flow path 3 at the finished surface 2. The building timber 1 can absorb water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5.

[0083] The inlet 4 is provided on the finishing surface 2. The inlet 4 may be provided on the surface 7 opposite to the finishing surface 2.

[0084] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 while being parallel to each other, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The flow path connection portion 5b has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0085] The parallel flow paths 5 include a first flow path group 5A consisting of a plurality of first flow paths 5a arranged along the finished surface 2 and extending parallel to the finished surface 2 while being parallel to each other, and an inner end of the outlet 6a is open, and a second flow path group 5B1 consisting of a plurality of second flow paths 5b1 arranged along the finished surface 2 and extending parallel to the finished surface 2 from one end of the plurality of first flow paths 5a to the other, and at least one first flow path 5a has a water-retaining layer 5c that protrudes toward the finished surface 2 beyond all of the second flow paths 5b1 connected to the first flow path 5a. According to the above configuration, the fire resistance of the finished surface 2 can be increased by the water held in the water-retaining layer 5c by passing water through the parallel flow paths 5.

[0086] The first flow passage group 5A has, as the first flow passage 5a, a first discharge flow passage 5a1 having a discharge port 6a without a water-retaining layer 5c, and a first water-retaining flow passage 5a2 having a water-retaining layer 5c without a discharge port 6a as the first flow passage 5a. According to the above configuration, by passing water through the parallel flow passages 5, the finishing surface 2 can be cooled by discharging water from the discharge port 6a of the first discharge flow passage 5a1, while the fire resistance of the finishing surface 2 can be increased by the water retained in the water-retaining layer 5c of the first water-retaining flow passage 5a2.

[0087] The parallel flow paths 5 have a discharge port group 6 consisting of a plurality of discharge ports 6a arranged along the first discharge flow paths 5a1 in correspondence with each of the first discharge flow paths 5a1. The plurality of discharge ports 6a may be arranged at equal intervals as shown in FIG.

[0088] The building timber 1 has a board 9 having grooves 8 forming parallel flow paths 5, and is formed of cross-laminated timber 14. The board 9 as lumber is joined to the cross-laminated timber 14. Instead of this configuration, the board 9 as lumber may be joined to the cross-laminated timber 14.

[0089] The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a. The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a groove 8 constituting the second flow path 5b1. The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a plurality of grooves 8 constituting the plurality of second flow paths 5b1.

[0090] In this embodiment, the fireproof wooden structure 13 has wooden construction pieces 1 .

[0091] Seventh embodiment As shown in Figures 21 to 23, in the seventh embodiment of the present invention, a building timber 1 has a finished surface 2 and a fire resistance flow path 3, and the fire resistance flow path 3 has an inlet 4, a hollow parallel flow path 5 that communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a that communicates with the parallel flow path 5 and opens to the finished surface 2, so that water passed through the inlet 4 in the event of a fire can be discharged from the outlet 6a through the parallel flow path 5.

[0092] The building timber 1 can retain water flowing through the fire resistance flow path 3. The building timber 1 can retain water flowing through the fire resistance flow path 3 at the finished surface 2. The building timber 1 can absorb water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5.

[0093] The inlet 4 is provided on the surface 7 opposite to the finishing surface 2. The inlet 4 may be configured to be provided on the finishing surface 2.

[0094] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 while being parallel to each other, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The flow path connection portion 5b has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0095] The parallel flow paths 5 include a first flow path group 5A consisting of a plurality of first flow paths 5a aligned along the finished surface 2 and extending parallel to the finished surface 2 while being parallel to each other, and an inner end of the outlet 6a is open, and a second flow path group 5B1 consisting of a plurality of second flow paths 5b1 aligned along the finished surface 2 and extending parallel to the finished surface 2 from one end of the plurality of first flow paths 5a to the other end, at least one first flow path 5a has a water-retaining layer 5c that protrudes toward the finished surface 2 side more than all the second flow paths 5b1 connected to the first flow path 5a. Each first flow path 5a has a water-retaining layer 5c that protrudes toward the finished surface 2 side more than all the second flow paths 5b1 connected to the first flow path 5a.

[0096] The first flow passage group 5A has a first flow passage 5a3 for draining accumulated water, which has a water-retaining layer 5c and an outlet 6a as the first flow passage 5a. According to the above configuration, the finishing surface 2 can be cooled by draining water from the outlet 6a of the first flow passage 5a3 for draining accumulated water by passing water through the parallel flow passages 5, while the fire resistance of the finishing surface 2 can be increased by the water held in the water-retaining layer 5c of the first flow passage 5a3 for draining accumulated water. The above-mentioned multiple first flow passages 5a are arranged vertically, and the first flow passage group 5A has the first flow passage 5a3 for draining accumulated water only at the upper end of the building timber 1. The first flow passage group 5A has only one first flow passage 5a3 for draining accumulated water only at the top of the building timber 1. According to the above configuration, the entire finishing surface 2 can be efficiently cooled by draining water from the outlet 6a of the first flow passage 5a3 for draining accumulated water with a small amount of water passing through. In this embodiment, the building timber 1 is used as a wall material, but it may also be used as a ceiling material or a floor material. That is, the finishing surface 2 may be horizontal, for example. The number and arrangement of the first pooled water drainage flow paths 5a3 provided in the first flow path group 5A can be set according to conditions.

[0097] The parallel flow paths 5 have an outlet group 6 consisting of a plurality of outlets 6a arranged along the first accumulated water discharge flow path 5a3 in correspondence with the first accumulated water discharge flow path 5a3. The plurality of outlets 6a may be arranged at equal intervals, for example, as shown in Fig. 22. The number and arrangement of the outlets 6a in the outlet group 6 may be set according to conditions.

[0098] The building timber 1 has a board 9 having grooves 8 forming parallel flow paths 5, and is formed by cross-laminated timber 14. The board 9 as sawn lumber is joined to the cross-laminated timber 14.

[0099] The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a. The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a groove 8 constituting the second flow path 5b1. The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a plurality of grooves 8 constituting the plurality of second flow paths 5b1.

[0100] In this embodiment, the fireproof wooden structure 13 has wooden construction pieces 1 .

[0101] Eighth embodiment As shown in Figures 24 to 26, in the eighth embodiment of the present invention, a building timber 1 has a finished surface 2 and a fire resistance flow path 3, and the fire resistance flow path 3 has an inlet 4, a hollow parallel flow path 5 which communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a which communicates with the parallel flow path 5 and opens to the finished surface 2, so that water passed through the inlet 4 in the event of a fire can be discharged from the outlet 6a through the parallel flow path 5.

[0102] The building timber 1 can retain water flowing through the fire resistance flow path 3. The building timber 1 can retain water flowing through the fire resistance flow path 3 at the finished surface 2. The building timber 1 can absorb water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5.

[0103] The inlet 4 is provided on the surface 7 opposite to the finishing surface 2. The inlet 4 may be configured to be provided on the finishing surface 2.

[0104] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 while being parallel to each other, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The flow path connection portion 5b has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0105] The parallel flow paths 5 include a first flow path group 5A consisting of a plurality of first flow paths 5a arranged along the finished surface 2 and extending parallel to the finished surface 2 while being parallel to each other, and an inner end of the outlet 6a is opened, and a second flow path group 5B1 consisting of a plurality of second flow paths 5b1 arranged along the finished surface 2 and extending parallel to the finished surface 2 from one end of the plurality of first flow paths 5a to the other end, and at least one second flow path 5b1 has a water-retaining layer 5c that protrudes toward the finished surface 2 side more than all the first flow paths 5a connected to the second flow path 5b1. Each second flow path 5b1 has a water-retaining layer 5c that protrudes toward the finished surface 2 side more than all the first flow paths 5a connected to the second flow path 5b1. According to the above configuration, the fire resistance of the finished surface 2 can be increased by the water held in the water-retaining layer 5c by passing water through the parallel flow paths 5.

[0106] The first flow passage group 5A has a first discharge flow passage 5a1 that does not have a water-retaining layer 5c and has a discharge port 6a as the first flow passage 5a. The above-mentioned multiple first flow passages 5a are arranged vertically, and the first flow passage group 5A has a first discharge flow passage 5a1 only at the upper end of the building timber 1. The first flow passage group 5A has only one first discharge flow passage 5a1 only at the top of the building timber 1. With the above configuration, the entire finishing surface 2 can be efficiently cooled by discharging water from the discharge port 6a of the first discharge flow passage 5a1 with a small amount of water passing through. In this embodiment, the building timber 1 is used as a wall material, but it may also be used as a ceiling material or a floor material. That is, the finishing surface 2 may be used, for example, horizontally. The number and arrangement of the first discharge flow passages 5a1 provided in the first flow passage group 5A can be set according to conditions.

[0107] The parallel flow paths 5 have a discharge port group 6 consisting of a plurality of discharge ports 6a arranged along the first discharge flow path 5a1 in correspondence with the first discharge flow path 5a1. The number and arrangement of the discharge ports 6a provided in the discharge port group 6 can be set according to conditions.

[0108] The building timber 1 has a board 9 having grooves 8 forming parallel flow paths 5, and is formed by cross-laminated timber 14. The board 9 as sawn lumber is joined to the cross-laminated timber 14.

[0109] The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a. The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a groove 8 constituting the second flow path 5b1. The plate 9 has a plurality of grooves 8 constituting the plurality of first flow paths 5a and a plurality of grooves 8 constituting the plurality of second flow paths 5b1.

[0110] In this embodiment, the fireproof wooden structure 13 has wooden construction pieces 1 .

[0111] <Ninth embodiment> As shown in Figures 27 to 30, in the ninth embodiment of the present invention, a building timber 1 has a finished surface 2 and a fire-resistant flow path 3, and the fire-resistant flow path 3 has an inlet 4 (first inlet 4'), a hollow parallel flow path 5 (first parallel flow path 5') that communicates with the inlet 4 and extends parallel to the finished surface 2, and an outlet 6a (first outlet 6a') that communicates with the parallel flow path 5 and opens to the finished surface 2, and in the event of a fire, water passed through the inlet 4 can be discharged from the outlet 6a through the parallel flow path 5.

[0112] The building timber 1 can retain water flowing through the fire resistance flow path 3. The building timber 1 can retain water flowing through the fire resistance flow path 3 at the finished surface 2. The building timber 1 can absorb water flowing through the fire resistance flow path 3 through the surfaces of the parallel flow paths 5.

[0113] The inlet 4 is provided on the surface 7 opposite to the finishing surface 2. The inlet 4 may be configured to be provided on the finishing surface 2.

[0114] The parallel flow paths 5 have a plurality of first flow paths 5a that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 while being parallel to each other, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The flow path connection portion 5b has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0115] The parallel flow paths 5 include a first flow path group 5A consisting of a plurality of first flow paths 5a arranged along the finished surface 2 and extending parallel to the finished surface 2 while being parallel to each other, and an inner end of the outlet 6a is opened, and a second flow path group 5B1 consisting of a plurality of second flow paths 5b1 arranged along the finished surface 2 and extending parallel to the finished surface 2 from one end of the plurality of first flow paths 5a to the other end, and at least one second flow path 5b1 has a water-retaining layer 5c that protrudes toward the finished surface 2 side more than all the first flow paths 5a connected to the second flow path 5b1. Each second flow path 5b1 has a water-retaining layer 5c that protrudes toward the finished surface 2 side more than all the first flow paths 5a connected to the second flow path 5b1. According to the above configuration, the fire resistance of the finished surface 2 can be increased by the water held in the water-retaining layer 5c by passing water through the parallel flow paths 5.

[0116] The first flow passage group 5A has a first discharge flow passage 5a1 that does not have a water-retaining layer 5c and has a discharge port 6a as the first flow passage 5a. The first flow passage group 5A has a plurality of first discharge flow passages 5a1. The plurality of first discharge flow passages 5a1 are arranged in a vertical direction. The parallel flow passages 5 have a discharge port group 6 consisting of a plurality of discharge ports 6a arranged along the first discharge flow passage 5a1 in correspondence with each of the first discharge flow passages 5a1.

[0117] The fire-resistant flow passage 3 has a second inlet 4'', a hollow second parallel flow passage 5'' that is connected to the second inlet 4'' and extends parallel to the finished surface 2 on the opposite side of the finished surface 2 from the first parallel flow passage 5', and a second outlet 6a'' that is connected to the second parallel flow passage 5'' and opens to the finished surface 2, so that water passed from the second inlet 4'' in the event of a fire can be discharged from the second outlet 6a'' through the second parallel flow passage 5''. According to the above configuration, the finished surface 2 can be cooled not only by the first parallel flow passage 5' but also by the second parallel flow passage 5'', so that the fire resistance can be further improved. In addition, since the second parallel flow passage 5'' is provided on the opposite side of the finished surface from the first parallel flow passage 5' having the aquifer 5c, the aquifer 5c of the first parallel flow passage 5' can be provided near the finished surface 2, so that the fire resistance can be further improved. The second parallel flow passage 5'' may be configured to communicate with the second inlet 4'' and extend parallel to the finishing surface 2 on the side of the finishing surface 2 closer to the finishing surface 2 than the first parallel flow passage 5'.

[0118] The second parallel flow path 5" has a plurality of first flow paths 5a that are aligned along the finishing surface 2, are parallel to each other, and extend parallel to the finishing surface 2, and a flow path connection portion 5b that connects all of the first flow paths 5a to each other. The flow path connection portion 5b of the second parallel flow path 5" has second flow paths 5b1 that are aligned along the finishing surface 2 and extend parallel to the finishing surface 2 from one end to the other of the plurality of first flow paths 5a of the second parallel flow path 5". The flow path connection portion 5b of the second parallel flow path 5" has a plurality of second flow paths 5b1 that are aligned along the finishing surface 2.

[0119] The second parallel flow paths 5" have a first flow path group 5A consisting of a plurality of first flow paths 5a aligned along the finished surface 2, parallel to each other, and extending parallel to the finished surface 2, with the inner ends of the second outlets 6a" being open, and a second flow path group 5B1 consisting of a plurality of second flow paths 5b1 aligned along the finished surface 2 and extending parallel to the finished surface 2 from one end of the plurality of first flow paths 5a to the other end of the plurality of first flow paths 5a. The first flow path group 5A of the second parallel flow paths 5" has a first discharge flow path 5a1 as the first flow path 5a, which does not have a water-retaining layer 5c and has a second outlet 6a". The first flow path group 5A of the second parallel flow paths 5" has a plurality of first discharge flow paths 5a1. The plurality of first discharge flow paths 5a1 of the second parallel flow paths 5" are arranged in a horizontal line. The second parallel flow paths 5" have an outlet group 6 consisting of a plurality of second outlets 6a" aligned along the first discharge flow path 5a1, corresponding to each first discharge flow path 5a1.

[0120] The second inlet 4 ″ is provided on the finished surface 2 of the building timber 1 . The second inlet 4 ″ may be provided on the surface 7 opposite to the finished surface 2 .

[0121] The building timber 1 has a first layer of boards 9 having grooves 8 that form a first parallel flow path 5' and a second layer of boards 9 having grooves 8 that form a second parallel flow path 5", and is formed by cross-laminated timber 14. The first layer of boards 9 as lumber are joined to the second layer of boards 9 as lumber. The second layer of boards 9 are joined to the cross-laminated timber 14.

[0122] The first layer plate 9 has a groove 8 that constitutes a part of the first parallel flow path 5'. The first layer plate 9 has a plurality of grooves 8 that constitute a part of the plurality of first flow paths 5a of the first parallel flow path 5'. The first layer plate 9 has a plurality of grooves 8 that constitute a part of the plurality of second flow paths 5b1 of the first parallel flow path 5'. With the above configuration, the first parallel flow path 5' can be easily realized.

[0123] The second layer plate 9 has a groove 8 which constitutes a part of the second parallel flow path 5". The second layer plate 9 has a plurality of grooves 8 which constitute a part of the plurality of first flow paths 5a of the second parallel flow path 5". The second layer plate 9 has a plurality of grooves 8 which constitute a part of the plurality of second flow paths 5b1 of the second parallel flow path 5". With the above configuration, the second parallel flow path 5" can be easily realized.

[0124] In this embodiment, the fireproof wooden structure 13 has wooden construction pieces 1 .

[0125] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be modified in various ways without departing from the gist of the present invention.

[0126] For example, the building timber 1 may have a board 9 having grooves 8 forming parallel flow paths 5, and may be formed of lumber, laminated veneer lumber, plywood, laminated timber 10, orthogonal laminated timber 14, or any combination thereof. The building timber 1 may have a finished surface 2 on both sides. When fire resistance is required on both sides, for example, the building timber 1 may have a first finished surface 2, a first fire-resistant flow path 3, a second finished surface 2 which is the surface 7 opposite to the first finished surface 2, and a second fire-resistant flow path 3, and the first fire-resistant flow path 3 has a first inlet 4, a hollow first parallel flow path 5 which communicates with the first inlet 4 and extends parallel to the first finished surface 2, and a first outlet 6a which communicates with the first parallel flow path 5 and opens into the first finished surface 2, and the first inlet 4 is formed as the ... outlet 6a, and the first inlet 4 is formed as the first outlet 6a, and the first inlet 4 is formed as the first outlet 6a, and the first parallel flow path 5 is formed as the first outlet 6a, and the first outlet 6a is formed as the first outlet 6a, and the first inlet 4 is formed as the first outlet 6a, and the first parallel flow path 5 is formed as the first outlet 6a, and the first outlet 6a is formed as the first outlet 6a, and the first outlet 6a is formed as the first outlet 6a, and the first outlet 6a is formed as the first outlet 6a, and the first parallel flow path 5 is formed as the first outlet 6a, and the first parallel flow path The second fire-resistant flow path 3 may have a second inlet 4, a hollow second parallel flow path 5 which communicates with the second inlet 4 and extends parallel to the second finished surface 2, and a second outlet 6a which communicates with the second parallel flow path 5 and opens to the second finished surface 2, so that water passed through the second inlet 4 in the event of a fire can be discharged from the second outlet 6a through the second parallel flow path 5. [Explanation of symbols]

[0127] 1 Architectural wood 2 Finishing Surface 3 Fireproof channel 4. Introduction 4' First entrance 4” Second inlet 5 Parallel flow paths 5' First parallel channel 5” Second parallel channel 5a First flow path 5A First flow path group 5a1 First discharge flow path 5a2 First water passage 5a3 First flow path for draining accumulated water 5b Flow path connection 5b1 Second flow path 5B1 Second flow path group 5c aqueous layer 6 Outlet group 6a Outlet 6a' First outlet 6a” Secondary Outlet 7 surface 8 grooves 9 boards 10 Laminated wood 11 Through hole 12 Plug body 13 Wooden fireproof structure 14 Cross-laminated timber

Claims

1. A finished surface and a refractory flow passage; The fire-resistant flow path has an inlet, a hollow parallel flow path that is connected to the inlet and extends parallel to the finished surface, and an outlet that is connected to the parallel flow path and opens to the finished surface, and in the event of a fire, water passed through the inlet can be discharged from the outlet through the parallel flow path.

2. 2. The building timber of claim 1, capable of retaining water flowing through said fire-resistant channels.

3. 3. The building lumber of claim 2, wherein said facing surface is capable of retaining water flowing through said fire-resistant channels.

4. The building timber according to claim 2, wherein water flowing through said fire-resistant flow passages can be absorbed through the surfaces of said parallel flow passages.

5. The building timber according to claim 1 , wherein the inlet is provided on the surface opposite to the finished surface or on the finished surface.

6. The building timber according to claim 1, wherein the parallel flow paths have a plurality of first flow paths aligned along the finished surface, parallel to each other and extending parallel to the finished surface, and a flow path connection portion that connects all of the first flow paths to each other.

7. The building timber according to claim 6 , wherein the flow passage connection portion has second flow passages arranged along the finished surface and extending parallel to the finished surface from one end to the other of the plurality of first flow passages.

8. The building timber according to claim 6 , wherein the parallel flow paths have a group of outlets, each of the outlets corresponding to each of the first flow paths, the group being made up of a plurality of the outlets arranged along the first flow paths.

9. The parallel flow paths include a first flow path group consisting of a plurality of first flow paths aligned along the finishing surface, parallel to each other, and extending parallel to the finishing surface, the first flow path group having an inner end opening at the discharge port, and a second flow path group consisting of a plurality of second flow paths aligned along the finishing surface and extending parallel to the finishing surface from one end to the other of the plurality of first flow paths, 2. The building timber described in claim 1, wherein at least one of the first flow paths has a water-retaining layer that protrudes closer to the finished surface than all of the second flow paths connected to the first flow path, or at least one of the second flow paths has a water-retaining layer that protrudes closer to the finished surface than all of the first flow paths connected to the second flow path.

10. The building timber described in claim 9, wherein the first flow path group includes a first flow path for discharge having the discharge outlet without the water-retaining layer as the first flow path, and a first flow path for water retention having the water-retaining layer without the discharge outlet as the first flow path.

11. The building timber according to claim 9 , wherein the first flow passage group includes a first flow passage for draining retained water, the first flow passage having the retained water layer and the drain outlet.

12. The building timber according to claim 9 , wherein the second flow passage group includes a water-retaining second flow passage having the water-retaining layer and no outlet as the second flow passage.

13. The building timber described in claim 9, wherein the fire-resistant flow path has a second inlet, a hollow second parallel flow path that communicates with the second inlet and extends parallel to the finished surface on the opposite side or side of the finished surface from the parallel flow path, and a second exhaust outlet that communicates with the second parallel flow path and opens to the finished surface, and wherein water passed through the second inlet in the event of a fire can be discharged from the second exhaust outlet through the second parallel flow path.

14. The building timber according to claim 9, wherein the second inlet is provided on an outer surface of the building timber.

15. A plate having a groove that forms the parallel flow path, The building timber according to claim 1, which is formed by lumber, laminated veneer lumber, plywood, laminated lumber, cross-laminated lumber, or any combination thereof.

16. A fire-resistant wood structure comprising the building lumber according to claim 1.

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