Refractory wood

Abstract

We provide fire-resistant wood that offers excellent carbon dioxide emission reduction and circularity benefits. [Solution] A fire-resistant wood comprising a main body made of wood and a first fire-resistant part laminated together, wherein the first fire-resistant part is laminated in the same order as the main body and the first fire-resistant part, comprising: a first inner adhesive layer made of an adhesive that adheres to the main body; a first fire-stopping layer made of one or more layers of paulownia wood that adheres to the first inner adhesive layer; a first outer adhesive layer made of an adhesive that adheres to the first fire-stopping layer; and a first burn-out layer made of one or more layers of wood that adheres to the first outer adhesive layer.

Description

Technical Field

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

Background Art

[0002] Fire-resistant wood formed by incorporating a flame retardant into wood is known (see, for example, paragraph

[0004] of Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, fire-resistant wood as described above has problems in terms of, for example, the amount of carbon dioxide emissions required during production exceeding the amount of carbon dioxide fixed by the wood, and the recyclability.

[0005] Therefore, an object of the present invention is to provide fire-resistant wood having an excellent carbon dioxide emission reduction effect and recyclability.

Means for Solving the Problems

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

[0007] [1] It has a main body part made of wood and a first fire-resistant part laminated thereon. The first fire-resistant part includes, in the lamination direction of the main body part and the first fire-resistant part, a first inner adhesive layer made of an adhesive that adheres to the main body part, one or more paulownia wood layers that adhere to the first inner adhesive layer and form a first fire-stopping layer, a first outer adhesive layer made of an adhesive that adheres to the first fire-stopping layer, and one or more wood layers that adhere to the first outer adhesive layer and form a first charring layer, laminated in this order.

[0008] [2] The main body is made of thick planks as a wood material, as described in [1], fire-resistant wood.

[0009] [3] The fire-resistant wood according to [1] or [2], wherein the thickness of one layer of wood in the first burnable layer in the lamination direction is 12 to 50 mm.

[0010] [4] In the aforementioned lamination direction, the thickness of one layer of paulownia wood in the first fire-stopping layer is 12 to 50 mm, as described in any one of items [1] to [3].

[0011] [5] In the aforementioned lamination direction, the thickness of the main body is greater than the thickness of the first fire-stopping layer, as described in any one of items [1] to [4].

[0012] [6] The first fire-resistant section, the main body section, and the second fire-resistant section are stacked in this order. The fire-resistant wood according to any one of [1] to [5], wherein the second fire-resistant part is laminated in the same order as the main body and the second fire-resistant part, comprising: a second inner adhesive layer made of an adhesive that adheres to the main body; a second fire-stopping layer made of one or more layers of paulownia wood that adheres to the second inner adhesive layer; a second outer adhesive layer made of an adhesive that adheres to the second fire-stopping layer; and a second burn-out layer made of one or more layers of wood that adheres to the second outer adhesive layer.

[0013] [7] Fire-resistant wood as described in any one of items [1] to [6], which is used as wall material, floor material, or ceiling material. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide fire-resistant wood that is excellent in reducing carbon dioxide emissions and in terms of recyclability. [Brief explanation of the drawing]

[0015] [Figure 1] It is a side view showing the fire-resistant wood of the first embodiment of the present invention. [Figure 2] It is a side view showing the fire-resistant wood of the second embodiment of the present invention.

Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be illustrated and described with reference to the drawings.

[0017] As shown in FIG. 1, in the first embodiment of the present invention, the fire-resistant wood 1 has a main body portion 2 made of wood and a first fire-resistant portion 3A laminated thereon. The first fire-resistant portion 3A includes a first inner adhesive layer 4A made of an adhesive that adheres to the main body portion 2 in the lamination direction of the main body portion 2 and the first fire-resistant portion 3A, a first flame-retardant layer 5A made of one or more layers (one layer in the example shown in FIG. 1) of paulownia wood that adheres to the first inner adhesive layer 4A, a first outer adhesive layer 6A made of an adhesive that adheres to the first flame-retardant layer 5A, and one or more layers (one layer in the example shown in FIG. 1) of wood that adheres to the first outer adhesive layer 6A. The first flame-retardant layer 5A is laminated in this order and has a first charring layer 7A. When the first flame-retardant layer 5A is composed of two or more layers of paulownia wood, two adjacent layers in the lamination direction are joined via an adhesive layer made of an adhesive. When the first charring layer 7A is composed of two or more layers of wood, two adjacent layers in the lamination direction are joined via an adhesive layer made of an adhesive.

[0018] For example, in the case of cedar wood, the ignition point is 180°C, the fire point is 238°C, and the red heat temperature is 230 - 270°C. On the other hand, in the case of paulownia wood, the ignition point is 270°C, the fire point is 475°C, and moreover, since the thermal conductivity is low and the heat insulation property is excellent, it exhibits excellent performance as a flame-retardant layer while being wood, and can suppress the spread of fire to the main body portion 2 made of wood. Further, by appropriately setting the material, the number of laminations, and the thickness T in the lamination direction of one layer of the first charring layer 7A made of one or more layers of wood, a desired fire resistance time, such as a 30-minute fire resistance specification, can be easily realized. The first inner adhesive layer 4A and the first outer adhesive layer 6A (and other adhesive layers provided as appropriate) may each be configured to contain a flame retardant as needed.

[0019] The first fire-resistant section 3A described above reduces carbon dioxide emissions during manufacturing compared to conventional methods that incorporate flame retardants into the wood. Furthermore, paulownia trees grow quickly and reach maturity in 15 to 25 years. Therefore, the above configuration makes it possible to realize fire-resistant wood 1 with excellent carbon dioxide emission reduction and circularity. Fire-resistant wood 1 with the above configuration is suitable for use as a construction material, and is particularly suitable for use as a surface material such as wall material, floor material, and ceiling material.

[0020] The main body 2 is preferably constructed from thick planks of wood. Examples of wood materials include cross-laminated timber (CLT), laminated timber, laminated veneer lumber (LVL), dowel-laminated timber (DLT) with one or more layers joined with wooden dowels, or nail-laminated timber (NLT) with one or more layers joined with nails.

[0021] When the main body 2 is constructed from orthogonal glued timber, the orthogonal glued timber is constructed by laminating sawn timber with the fiber direction perpendicular to that direction in the lamination direction. When the main body 2 is constructed from glued timber, the glued timber is constructed by laminating sawn timber with the fiber direction aligned to that direction in the lamination direction. When the main body 2 is constructed from veneer laminated timber, the veneer laminated timber is constructed by laminating veneers with the fiber direction aligned to that direction in the lamination direction. When the main body 2 is constructed from one or more layers of dowel-jointed glued timber, the dowel-jointed glued timber is constructed by joining sawn timber aligned in a direction perpendicular to the lamination direction with wooden dowels. When the main body 2 is constructed from one or more layers of nail-jointed glued timber, the nail-jointed glued timber is constructed by joining sawn timber aligned in a direction perpendicular to the lamination direction with nails. In the example shown in Figure 1, the main body 2 is made from orthogonal glued timber.

[0022] According to the above configuration, by taking advantage of the high strength characteristics of the thick wood plate material, a high-strength fire-resistant wood 1 can be realized that is particularly suitable for use as a large-area surface material such as a wall material, floor material, or ceiling material. When used as a surface material, the thickness of the thick wood plate material is preferably 60 to 270 mm. From the viewpoint of the main body 2 bearing the load of the structure as a construction material, it is preferable that the thickness of the main body 2 is greater than the thickness of the first fire-stopping layer 5A in the lamination direction.

[0023] In the stacking direction, the thickness T of one layer of wood in the first burnt layer 7A. 1A The thickness is preferably 12 to 50 mm. With the above configuration, a 30-minute fire-resistant specification can be easily achieved with one layer of wood in the first burnable layer 7A.

[0024] In the lamination direction, the thickness T of one layer of paulownia wood in the first fire-stopping layer 5A. 2A The thickness is preferably 12 to 50 mm. With the above configuration, the performance as a fire-stopping layer can be easily achieved with one layer of paulownia wood in the first fire-stopping layer 5A.

[0025] As shown in the second embodiment in Figure 2, the fire-resistant wood 1 has a first fire-resistant section 3A, a main body section 2, and a second fire-resistant section 3B laminated in this order. The second fire-resistant section 3B may have a configuration in which a second inner adhesive layer 4B made of adhesive that adheres to the main body section 2, a second fire-stopping layer 5B made of one or more layers of paulownia wood that adheres to the second inner adhesive layer 4B, a second outer adhesive layer 6B made of adhesive that adheres to the second fire-stopping layer 5B, and a second burn-through layer 7B made of one or more layers of wood that adheres to the second outer adhesive layer 6B are laminated in this order. With the above configuration, in addition to the effects described above, excellent fire resistance can be achieved on both sides of the main body section 2.

[0026] The second fire-resistant section 3B may have the same layer structure and thickness as the first fire-resistant section 3A, but is not limited to this. Thickness T of one layer of wood in the second burnable layer 7B. 1B It is preferable that the thickness is 12 to 50 mm. Thickness T of one layer of paulownia wood in the second fire-stopping layer 5B. 2BIt is preferable that the length is between 12 and 50 mm.

[0027] As described above, the fire-resistant wood 1 of the first and second embodiments is particularly suitable for forming a surface material, but it is not limited to this and may also be used to form axial members such as columns and beams. In this case, the main body 2 may be made of thick wooden board material (preferably 90 mm or thicker) or of sawn lumber.

[0028] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and the embodiments described above can be modified in various ways without departing from the spirit of the present invention. [Explanation of symbols]

[0029] 1 Fireproof wood 2 Main body 3A 1st fireproof section 3B 2nd fireproof section 4A 1st inner adhesive layer 4B Second inner adhesive layer 5A First fire-stopping layer 5B Second fire containment layer 6A 1st outer adhesive layer 6B Second outer adhesive layer 7A First Combustion Layer 7B Second Burning Layer T 1A The thickness of one layer of wood in the first burnt layer T 1B The thickness of one layer of wood in the second burnt layer. T 2A The thickness of one layer of paulownia wood in the first fire-stopping layer. T 2B The thickness of one layer of paulownia wood in the second fire-stopping layer.

Claims

1. It has a main body made of wood and a first fire-resistant part laminated together, The first fire-resistant part is a fire-resistant wood having, in the stacking direction of the main body and the first fire-resistant part, a first inner adhesive layer made of an adhesive that adheres to the main body, a first fire-stopping layer made of one or more layers of paulownia wood that adheres to the first inner adhesive layer, a first outer adhesive layer made of an adhesive that adheres to the first fire-stopping layer, and a first burn-out layer made of one or more layers of wood that adheres to the first outer adhesive layer, stacked in this order.

2. The fire-resistant wood according to claim 1, wherein the main body is made of a thick board material as a wood material.

3. The fire-resistant wood according to claim 1, wherein in the aforementioned stacking direction, the thickness of one layer of wood in the first burnable layer is 12 to 50 mm.

4. The fire-resistant wood according to claim 1, wherein in the lamination direction, the thickness of one layer of paulownia wood in the first fire-stopping layer is 12 to 50 mm.

5. The fire-resistant wood according to claim 1, wherein in the lamination direction, the thickness of the main body is greater than the thickness of the first fire-stopping layer.

6. The first fire-resistant part, the main body part, and the second fire-resistant part are stacked in this order, The fire-resistant wood according to claim 1, wherein the second fire-resistant part is laminated in the same order as the main body and the second fire-resistant part, comprising: a second inner adhesive layer made of an adhesive that adheres to the main body; a second fire-stopping layer made of one or more layers of paulownia wood that adheres to the second inner adhesive layer; a second outer adhesive layer made of an adhesive that adheres to the second fire-stopping layer; and a second burn-through layer made of one or more layers of wood that adheres to the second outer adhesive layer.

7. The fire-resistant wood material according to claim 1, which is a wall material, floor material, or ceiling material.

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