JP2019173447A - Flame-retardant treated woody material, and fireproof structural member - Google Patents

Abstract

To provide a flame-retardant treated woody material capable of securing sufficient adhesive force to a load support portion and protecting a load support portion more securely, and a fireproof structural member comprising the same.SOLUTION: A flame-retardant treated woody material is bonded to a surface of a load support portion of a fireproof structural member. The flame-retardant treated woody material comprises: a plate-shaped core material impregnated with a flame-retardant chemical; and an inner layer material which comprises a wooden plate including an adhesive surface bonded to the surface of the load support portion, which is laminated in a plate thickness direction with respect to the core material and which is thermally pressure-bonded to the core material. The inner layer material is flame-retardant untreated material which is not impregnated with the flame-retardant chemical.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a flame-retardant treated wood material and a fireproof structural member provided with the same.

  In recent years, interest in large-scale fireproof wooden buildings has increased, and along with that, development of building structural members having fireproof performance has been promoted. As one of such fire-resistant structural members, as disclosed in Patent Document 1, a fire-resistant structure including a load support portion that supports a load of a building and a flame stop layer that covers the surface of the load support portion. Glulam is known. According to this fireproof laminated material, by preventing the combustion from propagating to the load support portion by the flame stop layer, the load support portion can be protected in the event of a fire.

  The fireproof laminated material of patent document 1 is provided with the load support part and the plywood fixed as a flame stop layer on the surface of the load support part. This plywood is composed of a chemical-treated wood board and an untreated wood board (impregnated with a flame retardant chemical) so that at least one layer on the side in contact with the load supporting portion is a chemical-treated wood board impregnated with a phosphate-based flame retardant chemical. It is configured by adhering the wooden boards together. Then, this plywood is fixed to the surface with a fastener such as a wood screw or a nail in a state where the one layer on which the chemical treatment wood board is disposed is in contact with the surface of the load support portion, thereby providing a fireproof assembly. The material is composed.

JP 2009-174286 A

  As described above, in Patent Document 1, a flame retardant is impregnated on a wooden board that comes into contact with the surface of the load support portion among a plurality of wooden boards constituting the plywood. Here, when trying to bond the plywood to the surface of the load support part using an adhesive, the adhesive strength of the plywood may not be sufficiently secured due to the poor affinity between the flame retardant and the adhesive. is there. This is partly due to the need to bond at room temperature in addition to the poor affinity between the flame retardant and the adhesive. For this reason, in patent document 1, the plywood was fixed to the load support part using the fastener.

  However, in the refractory laminated material of Patent Document 1, there is a concern that a fastener such as a wood screw or a nail serves as a propagation path of combustion, and combustion is propagated to the load support portion. Therefore, with this fireproof laminated material, it is difficult to reliably protect the load support portion in the event of a fire.

  The present invention has been made in view of the above problems, and its purpose is to provide a flame retardant capable of ensuring sufficient adhesion to the load support portion and more reliably protecting the load support portion. It is to provide a treated wood material and a refractory structural member provided with the same.

  The flame-retardant treated wood material according to one aspect of the present invention is bonded to the surface of the load support portion of the fireproof structural member. This flame-retardant treated wood material is composed of a plate-like core material impregnated with a flame-retardant agent and a wooden board including an adhesive surface bonded to the surface of the load support portion, and in the thickness direction with respect to the core material. An inner layer material that overlaps and is heat-pressure bonded to the core material with a thermosetting adhesive. The inner layer material is a flame retardant untreated material that is not impregnated with the flame retardant agent.

  Since this flame-retardant-treated wood material is impregnated with a flame retardant agent in the core material, it can be used as a flame stop layer by adhering to the surface of the load support portion of the fire-resistant structural member. Thereby, when a load support part consists of combustibles (for example, wood, plastics, etc.), combustion of a load support part can be suppressed. Moreover, when a load support part consists of nonflammable materials (for example, steel etc.), the temperature rise of a load support part can be suppressed and the thermal deformation of the said load support part can be suppressed.

  Here, the inner layer material bonded to the surface of the load supporting portion is a flame retardant untreated material that is not impregnated with a flame retardant agent. For this reason, when adhering the inner layer material to the surface of the load support portion, it is possible to ensure a good adhesive force to the load support portion regardless of the affinity between the flame retardant and the adhesive. Therefore, since it can be securely fixed to the load support portion only by the adhesive, there is no need to use a fastener such as a wood screw or a nail, and there is a problem that the fastener becomes a combustion or heat propagation path. Does not occur. Therefore, combustion and heat propagation to the load support portion can be prevented, and the load support portion can be more reliably protected. Moreover, since the inner layer material is heat-pressure bonded to the core material with a thermosetting adhesive, the inner layer material is securely bonded to the core material, and the inner layer material is prevented from falling off the core material. Can do.

  The flame-retardant treated wood material is composed of a wooden board that sandwiches the core material in the thickness direction together with the inner layer material, and further includes an outer layer material that is heat-pressure bonded to the core material with a thermosetting adhesive. Also good. The outer layer material may be a flame retardant untreated material that is not impregnated with the flame retardant agent.

  According to this configuration, after the surface of the load support portion is coated with the flame retardant treated wood material, and further when the flame retardant treated wood material is coated with the decorative layer, the decorative layer is made of the flame retardant treated wood material only with the adhesive. It can be securely fixed to the material. This is because the outer layer material in contact with the decorative layer is not impregnated with a flame retardant, so even if the affinity between the flame retardant and the adhesive is poor, the adhesive force of the adhesive is less affected It is.

  In the flame-retardant treated wood material, the inner layer material may have a thickness of 0.5 mm to 10 mm.

  When the thickness of the inner layer material is less than 0.5 mm, the flame retardant impregnated in the core material may ooze out to the outermost surface of the flame retardant treated wood material, and it may be hot-pressure bonded to the core material. Is difficult. On the other hand, when the thickness of the inner layer material exceeds 10 mm, the inner layer material exposed to the butt surfaces of the flame-retardant treated wood materials becomes a combustion and heat propagation path, and the combustion and heat propagate to the load support portion. There is a fear. For this reason, it is preferable that the thickness of the inner layer material is 0.5 mm or more and 10 mm or less.

  In the flame-retardant treated wood material, the core material includes a plurality of wooden boards impregnated with the flame retardant agent, and the plurality of wooden boards overlap each other in the thickness direction and are thermo-pressure bonded to each other with a thermosetting adhesive. May be configured.

  According to this structure, after impregnating a flame retardant to each of a plurality of wooden boards, a core material is obtained by stacking them and applying heat and pressure. Thereby, a flame-retardant chemical | medical agent can be uniformly impregnated in the whole core material.

  A fireproof structural member according to another aspect of the present invention is used as a structural member of a fireproof wooden building. This fire-resistant structural member is bonded to cover the surface of the load support portion that supports the load of the building, and the flame stop layer that prevents combustion or heat propagation to the load support portion, It has. The flame stop layer is composed of the flame-retardant treated wood material of the present invention.

  In this fire-resistant structural member, the flame-retardant treated wood material of the present invention is adhered to the surface of the load supporting portion as a fire-stopping layer, so that it does not use a fastener such as a wood screw or a nail, and it stops burning only with an adhesive. The layer can be securely fixed to the surface of the load support portion. For this reason, it becomes possible to prevent combustion and heat from propagating to the load support portion by the above-mentioned fastener serving as a combustion or heat propagation path, and the load support portion can be more reliably protected.

  As is clear from the above description, according to the present invention, a flame-retardant treated wood material capable of ensuring sufficient adhesion to the load support portion and more reliably protecting the load support portion and A fireproof structural member provided with this can be provided.

It is a perspective view which shows typically the structure of the fireproof structural member which concerns on Embodiment 1 of this invention. It is a figure which shows typically the cross section of the fireproof structure member in alignment with line segment II-II in FIG. It is a perspective view which shows typically the structure of the flame-retardant processing wooden material which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows a mode that a laminated body is hot-pressed. It is a figure which shows typically the cross section of the fireproof structural member which concerns on Embodiment 2 of this invention. It is a figure which shows typically the cross section of the fireproof structural member which concerns on other embodiment of this invention. It is a figure which shows typically the cross section of the fireproof structural member which concerns on other embodiment of this invention. It is a schematic diagram which shows the attachment position of the thermocouple to the surface of the load support part in a fireproof performance evaluation test. It is a graph which shows the temperature change of the corner part of the load support part in the upper side measurement position in an Example. It is a graph which shows the temperature change of the side part of the load support part in the upper side measurement position in an Example. It is a graph which shows the temperature change of the corner part of the load support part in the intermediate | middle measurement position in an Example. It is a graph which shows the temperature change of the side part of the load support part in the intermediate | middle measurement position in an Example. It is a graph which shows the temperature change of the corner part of the load support part in the lower side measurement position in an Example. It is a graph which shows the temperature change of the side part of the load support part in the lower side measurement position in an Example. It is a graph which shows the temperature change of the load support part in the upper side measurement position in a comparative example. It is a graph which shows the temperature change of the load support part in the intermediate measurement position in a comparative example. It is a graph which shows the temperature change of the load support part in the lower side measurement position in a comparative example.

  Hereinafter, based on the drawings, a flame-retardant treated wood material according to an embodiment of the present invention and a fireproof structural member including the same will be described.

(Embodiment 1)
<Fireproof structural member>
First, the structure of the refractory structural member 1 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view schematically showing the external appearance of the fireproof structural member 1. FIG. 2 is a diagram schematically showing a cross section of the refractory structural member 1 along the line segment II-II in FIG. 1.

  The fire-resistant structural member 1 is used as a structural member (for example, a column or a beam) of a fire-resistant wooden building, and is a wooden structural member having a substantially quadrangular prism shape as shown in FIG. The fire-resistant structural member 1 covers a load support portion 10 that supports a load of a building, a flame stop layer 20 that is bonded so as to cover a surface 11 of the load support portion 10, and a surface 22 of the flame stop layer 20. And a decorative layer 30 bonded in this manner.

  The fireproof structural member 1 of the present embodiment is a pillar of a building, and as shown in FIGS. 1 and 2, the entire circumference of the load support portion 10 is covered with a flame stop layer 20. Moreover, in this embodiment, although the load support part 10, the flame-stopping layer 20, and the decorative layer 30 are all made of cedar, the type of wood is not particularly limited. Further, the decorative layer 30 is not an essential component in the fireproof structural member of the present invention, and may be omitted. Hereinafter, each component of the fireproof structural member 1 will be described.

  As shown in FIG. 1, the load support portion 10 is a wood material having a regular quadrangular prism shape. As shown in FIG. 2, the load support portion 10 in this embodiment is a structural laminated material in which a plurality of wooden boards 13 having a rectangular cross section are assembled and bonded. That is, the fireproof structural member 1 according to the present embodiment is a fireproof laminated material in which the load support portion 10 is composed of a laminated material. In addition, the load support part 10 is not limited to what consists of such a laminated material, You may be comprised by the single wooden board. Moreover, the cross-sectional shape orthogonal to the axis of the load support portion 10 is not limited to a square, and an arbitrary shape can be used.

  The flame stop layer 20 is a layer that prevents combustion or heat propagation to the load support portion 10 in the event of a fire in a building, and is composed of a plurality of flame-retardant treated wood materials 21 as shown in FIG. . This flame-retardant treated wood material 21 is made of, for example, a wood board that has been non-combusted by impregnation with a phosphoric acid or boric acid flame retardant.

  As shown in FIG. 2, the flame stop layer 20 is bonded so as to cover a plurality of inner flame-retardant treated wood materials 21A adhered to the surface 11 of the load support portion 10 and the inner flame-retardant treated wood material 21A. A plurality of outer flame-retardant treated wood materials 21B. That is, the flame stop layer 20 in the present embodiment is configured such that the flame-retardant treated wood material 21 has a multilayer (two-layer) structure. As a result, even if combustion or heat is to propagate from the decorative layer 30 side toward the load support portion 10 along the flame retardant untreated material described later, the load support portion is complicated by making the propagation path complicated. Combustion and heat propagation up to 10 can be prevented. The flame stop layer 20 is not limited to the two-layer structure as in the present embodiment, and may be a structure in which three or more layers of the flame-retardant treated wood material 21 are arranged, or the flame-retardant treated wood material. A single-layer structure in which only one layer 21 is arranged may be used.

  As shown in FIG. 2, the inner flame-retardant treated wood material 21 </ b> A is fixed to the four surfaces 11 via an adhesive so as to cover the entire circumference of the load support portion 10. Specifically, in the cross-sectional view of FIG. 2, two inner flame-retardant treated wood materials 21 </ b> A are fixed to one surface 11 of the load support portion 10 with an adhesive. At the four corners of the load support portion 10, the surface of one inner flame retardant treated wood material 21A (the surface facing the load support portion 10 side) is opposite to the end surface of another inner flame retardant treated wood material 21A. It is faced.

  As the adhesive used for fixing the inner flame-retardant treated wood material 21A, for example, a thermosetting adhesive such as resorcinol resin or phenol resin can be used. From the viewpoint of further increasing the adhesive force, the resorcinol resin adhesive. Is preferably used. However, this adhesive is not limited to a thermosetting adhesive, and any adhesive can be used.

  In addition, in the cross-sectional view of FIG. 2, it is not limited to the case where a plurality of inner flame-retardant treated wood materials 21A are fixed to one surface 11 of the load support portion 10, but one inner flame-retardant treated wood material. 21A may be fixed.

  As with the inner flame-retardant treated wood material 21A, two outer flame-retardant treated wood materials 21B are provided for each surface 11 of the load support portion 10 in the cross-sectional view of FIG. At the four corners of the load support portion 10, the end face of one outer flame retardant treated wood material 21B is abutted against the surface of another outer flame retardant treated wood material 21B adjacent thereto. Further, the surface of the one outer flame-retardant treated wood material 21B is abutted against the surface and the end face of the inner flame-retardant treated wood material 21A. And in each of four corners of the load support part 10, the butt | matching part of inner side flame-retardant treated wood material 21A and the butt | matching part of outer flame-retardant treated wood material 21B become the state which mutually shifted | deviated around the axis | shaft. Yes. Thereby, the path along the surface of the flame-retardant treated wood material 21 from the decorative layer 30 side toward the load support portion 10 becomes intricate, and as described above, combustion and heat propagation to the load support portion 10 can be prevented. it can.

  The outer flame-retardant treated wood material 21B is bonded to the surface of the inner flame-retardant treated wood material 21A using, for example, an adhesive of resorcinol resin or phenol resin. The outer flame-retardant treated wood material 21B has basically the same configuration as the inner flame-retardant treated wood material 21A.

  As shown in FIG. 2, the decorative layer 30 is provided so as to cover the entire periphery of the flame stop layer 20, and the surface thereof is decorated. The decorative layer 30 is made of untreated wood (flame retardant untreated material) that is not impregnated with a flame retardant agent.

  Here, in a general fireproof structure member, the adhesive force of the flame-retardant treated wood material (inner flame-retardant treated wood material) to the surface of the load support portion may be a problem. Specifically, the affinity between the adhesive used for adhesion to the load support portion and the flame retardant impregnated in the inner flame retardant treated wood material may be poor, and due to this, the load support portion It may be difficult to ensure sufficient adhesion of the inner flame-retardant treated wood material to the surface. In this case, there is a possibility that the inner flame-retardant treated wood material may fall off from the surface of the load support portion in the event of a fire, making it difficult to reliably protect the load support portion.

  On the other hand, the flame-retardant-treated wood material 21 according to the present embodiment improves the adhesion to the surface 11 by adopting a configuration in which the portion that contacts the surface 11 of the load support portion 10 is not impregnated with the flame-retardant agent. , And can be prevented from falling off from the surface 11. Hereinafter, the configuration of the flame-retardant treated wood material 21 will be described in detail.

<Flame-resistant wood material>
FIG. 3 is a perspective view schematically showing a configuration of the flame-retardant treated wood material 21 (inner flame-retardant treated wood material 21A) according to the present embodiment. As shown in FIG. 3, the flame-retardant treated wood material 21 includes a plate-like core material 26 impregnated with a flame retardant agent, and an inner layer material 25 made of a single wood board that overlaps the core material 26 in the thickness direction. And an outer layer material 24 made of a single wood board that sandwiches the core material 26 in the thickness direction together with the inner layer material 25.

  The core material 26 has a plurality (six in this embodiment) of wood boards 27 (drug-treated wood boards) impregnated with, for example, a phosphoric acid or boric acid flame retardant, and these wood boards 27 are the boards. They are configured by overlapping in the thickness direction and being bonded together by heat and pressure. The wooden boards 27 are heat-pressure bonded to each other with a thermosetting adhesive (for example, resorcinol resin or phenol resin adhesive) applied to the surface of the boards. Each wooden board 27 has a rectangular shape, for example, and has the same size.

  In addition, the number of the wooden boards 27 which comprise the core material 26, the shape of the wooden board 27, etc. are not specifically limited, It can select arbitrarily. The flame retardant agent impregnated in the wooden board 27 is not limited to phosphoric acid or boric acid.

  As shown in FIG. 3, the inner layer material 25 constitutes one outermost layer in the plate thickness direction of the flame-retardant treated wood material 21, and is hot-pressure bonded to the core material 26. Specifically, the inner layer material 25 has a rectangular shape having the same size as each of the wooden boards 27 constituting the core material 26 and is bonded to the surface 11 (FIG. 2) of the load support portion 10. 25A and a second inner layer adhesive surface 25B (surface opposite to the first inner layer adhesive surface 25A) bonded to the core member 26. The first inner layer adhesion surface 25A is one outermost surface in the thickness direction of the flame-retardant treated wood material 21. The inner layer material 25 is bonded to the core material 26 with a thermosetting adhesive such as resorcinol resin or phenol resin.

  Here, the inner layer material 25 bonded to the surface 11 of the load support portion 10 is a flame retardant untreated material (untreated wood board 28) that is not impregnated with the flame retardant agent. For this reason, when the inner layer material 25 is bonded to the surface 11 of the load support portion 10 as shown in FIG. 2, the problem of poor adhesion due to the poor affinity between the flame retardant and the adhesive as described above occurs. Hateful. Therefore, the flame-retardant treated wood material 21 can be reliably fixed to the surface 11 of the load support portion 10 with only the adhesive. Thereby, it becomes possible to prevent the flame-retardant treated wood material 21 from falling off from the surface 11 of the load support portion 10, and the load support portion 10 can be reliably protected by the flame-retardant treated wood material 21.

  Here, the “flame-retardant untreated material” in the present embodiment means a solid material, but is not limited thereto. For example, what is not impregnated with a flame retardant and contains a preservative is also included in the “flame retardant untreated material” in the present invention. The same applies to the outer layer material 24 and the decorative layer 30.

  In the present embodiment, the flame retardant treated wood material 21 is fixed to the surface 11 of the load support portion 10 only by an adhesive, but unless it causes combustion or heat propagation to the load support portion 10, You may use together fasteners, such as a screw and a nail. These fasteners function as fail-safe when the adhesive force due to the adhesive is insufficient.

  The thickness (plate thickness) of the inner layer material 25 is smaller than the thickness of each wooden board 27 which comprises the core material 26, for example, 0.5 mm or more and 10 mm or less. When the thickness of the inner layer material 25 is less than 0.5 mm, the flame retardant impregnated in the core material 26 may ooze out to the outermost surface of the flame retardant treated wood material 21. On the other hand, when the thickness of the inner layer material 25 exceeds 10 mm, the combustion propagates along the inner layer material 25 to the load support portion 10 at the abutting portion between the flame-retardant treated wood materials 21, and functions as the non-burning layer 20. May be disturbed. From such a viewpoint, the thickness of the inner layer material 25 in the present embodiment is 0.5 mm to 10 mm, preferably 1.0 mm to 5.0 mm, and preferably 1.5 mm to 3.0 mm. Or less, more preferably 2.0 mm or more and 3.0 mm or less. In addition, the said thickness range of the inner layer material 25 prescribes | regulates a preferable range, and is not limited to this.

  The outer layer material 24 constitutes the other outermost layer in the plate thickness direction of the flame-retardant treated wood material 21, and is bonded to the core material 26 by heat and pressure in the same manner as the inner layer material 25. The outer layer material 24 has a rectangular shape having the same size as each of the wooden boards 27 constituting the core material 26 and the wooden board constituting the inner layer material 25, and the first outer layer adhesive surface 24 </ b> A bonded to the core material 26 and the opposite side thereof. The second outer layer adhesion surface 24B. The second outer layer adhesion surface 24 </ b> B is the other outermost surface in the plate thickness direction of the flame-retardant treated wood material 21. Further, the thickness of the outer layer material 24 is substantially the same as the thickness of the inner layer material 25.

  The outer layer material 24 is bonded to the core material 26 with a thermosetting adhesive such as resorcinol resin or phenol resin. Further, as shown in FIG. 2, the outer layer material 24 of the inner flame-retardant treated wood material 21A is bonded to the inner layer material 25 of the outer flame-retardant treated wood material 21B with the above-mentioned adhesive. Further, the outer layer material 24 of the outer flame-retardant treated wood material 21B is bonded to the decorative layer 30 with the adhesive.

  Similar to the inner layer material 25, the outer layer material 24 is a flame retardant untreated material (untreated wood board 28) that is not impregnated with the flame retardant agent. For this reason, as in the case of the inner layer material 25, it is possible to obtain an effect of preventing adhesion failure due to poor affinity between the flame retardant and the adhesive. Specifically, in FIG. 2, the adhesion force of the outer flame-retardant treated wood material 21B to the surface of the inner flame-retardant treated wood material 21A and the adhesion force of the decorative layer 30 to the surface of the outer flame-retardant treated wood material 21B are ensured. be able to.

  Furthermore, when the decorative layer 30 is omitted, the surface of the outer flame-retardant treated wood material 21B is exposed to the outside. Here, when the outer layer material 24 is not provided, the core material 26 impregnated with the flame retardant is exposed to the outside. In this case, the flame retardant agent may absorb moisture from the outside air and crystallize. On the other hand, by providing the outer layer material 24, the flame retardant can be prevented from being exposed to the outside air, and crystallization of the flame retardant can be prevented. However, in the flame-retardant treated wood material of the present invention, the outer layer material is not an essential component and can be omitted.

  The flame-retardant treated wood material 21 in the present embodiment is obtained by laminating and heat-treating a plurality of wood boards so that the fiber directions of the plurality of wood boards (wood boards constituting the inner layer material 25, the core material 26 and the outer layer material 24) are parallel to each other. It is a single plate laminated material (LVL; Laminated Veneer Number) constituted by pressure bonding. However, the flame-retardant treated wood material of the present invention is not limited to LVL, and may be, for example, a plywood in which a plurality of wood boards are alternately laminated so that fiber directions differ by 90 °, The inner layer material 25 and the outer layer material 24 may be bonded to the front and back surfaces of a plate-like core material made of particle board or the like by hot-pressure bonding.

  Moreover, although this embodiment demonstrated the case where both the inner-layer material 25 and the outer-layer material 24 were comprised with one wood board, it is not limited to this. One or both of the inner layer material 25 and the outer layer material 24 may be composed of a plurality of wood boards.

<Method for manufacturing fire-resistant structural member>
Next, a method for manufacturing the fireproof structural member 1 will be described. First, the regular quadrangular columnar load support portion 10 shown in FIGS. 1 and 2 is prepared (preparation step). Subsequently, the flame-retardant treated wood material 21 (the inner flame-retardant treated wood material 21A and the outer flame-retardant treated wood material 21B) is produced by the following procedure (production process).

  First, the drug-treated wood board 27 and the untreated wood board 28 are respectively prepared (wood board preparation process). Specifically, first, the wooden board is cut into a rectangular shape of a predetermined size, and the cut wooden board is put into a pouring can (not shown) filled with a phosphoric acid or boric acid flame retardant. To do. And the pressurization and pressure reduction of a flame retardant chemical | medical agent are repeated in the said injection can. Thereby, a flame retardant chemical | medical agent is uniformly inject | poured with respect to the whole wooden board, and the chemical | medical agent processing wooden board 27 is obtained. On the other hand, the wood board not subjected to the impregnation treatment is used as the untreated wood board 28 in the following steps. In the present embodiment, six chemical-treated wood boards 27 and two untreated wood boards 28 are prepared for the production of one flame-retardant treated wood material 21.

  Next, a plurality of drug-treated wood boards 27 and a plurality of untreated wood boards 28 are stacked in the thickness direction, and the wood boards are bonded to each other with an adhesive applied to the board surface, thereby producing a laminate 90 ( Laminating step). Specifically, first, the first unprocessed wood board 28 is placed on an arbitrary table (not shown). And the 1st chemical | medical-treatment wood board 27 which apply | coated the adhesive agent to one board surface is piled up on the said un-processed wood board 28 in the state which faced the said adhesive agent below. Next, an adhesive is applied to one surface of the second chemical-treated wooden board 27, and this adhesive is placed on the first chemical-treated wooden board 27 with the adhesive facing downward. By repeating this procedure, the remaining four chemical-treated wood boards 27 are sequentially stacked.

  Finally, an adhesive is applied to one surface of the second untreated wood board 28, and the adhesive is placed on the uppermost chemical-treated wood board 27 with the adhesive facing downward. In this way, a laminate 90 (FIG. 4) is prepared in which the two untreated wood boards 28 are arranged so as to be one of the outermost layers in the thickness direction. The adhesive used in the laminating process is a thermosetting adhesive such as resorcinol resin or phenol resin. As shown in FIG. 3, two untreated wood boards 28 constitute an inner layer material 25 and an outer layer material 24, respectively, and six drug-treated wood boards 27 constitute a core material 26.

  Next, pressure is applied to the laminate 90 in the thickness direction while the laminate 90 is heated (hot pressing process). Specifically, as shown in FIG. 4, a laminate 90 is disposed between an upper press portion 82 having a flat upper press surface 82A and a lower press portion 83 having a flat lower press surface 83A. . Then, at least one of the upper press portion 82 and the lower press portion 83 is moved by a drive source (not shown) so that the upper press surface 82A and the lower press surface 83A approach each other. Thereby, the laminate 90 is pressed in the plate thickness direction by the upper press surface 82A and the lower press surface 83A. During this pressing, the laminate 90 is heated at a predetermined temperature, whereby the adhesive applied to the plate surface is thermally cured, and the adjacent wooden boards are firmly bonded to each other.

  In the hot-pressing step, the heating temperature of the laminated body 90 is preferably 80 to 180 ° C. from the viewpoint of curing the thermosetting adhesive in a shorter time to achieve reliable bonding between the wooden boards. More preferably, the temperature is 150 ° C. For the same reason, the pressing pressure is preferably 0.5 to 1.0 MPa, and the pressing time is preferably 10 to 30 minutes.

  Next, in order to flatten the front and back surfaces of the laminate 90, a cutting process is performed. As a result, the untreated wood board 28 becomes thinner than the drug-treated wood board 27. The flame-retardant treated wood material 21 is produced by the procedure as described above.

  Next, the flame-retardant-treated wood material 21 is affixed to the surface 11 of the load support part 10 (an affixing process). Specifically, an adhesive (resorcinol resin or phenol resin adhesive) is applied to the first inner layer adhesive surface 25A (FIG. 3) of the flame-retardant treated wood material 21, and the length direction of the flame-retardant treated wood material 21 is The first inner layer adhesive surface 25 </ b> A is affixed to the surface 11 of the load support portion 10 in a state that matches the length direction of the load support portion 10. Then, pressing is performed by pressing the flame-retardant treated wood material 21 against the surface 11 of the load support portion 10 using a hydraulic press mechanism (not shown) or the like.

  By continuing this pressed state for a predetermined time, the adhesive is cured, whereby the flame-retardant treated wood material 21 (inner flame-retardant treated wood material 21A) is adhered to the surface 11 of the load support portion 10. Thereafter, in the same procedure, the outer flame-retardant treated wood material 21B is bonded to the surface of the inner flame-retardant treated wood material 21A, and the decorative layer 30 is further bonded to the surface of the outer flame-retardant treated wood material 21B. The fireproof structural member 1 is produced by the procedure as described above.

  The outline of the manufacturing method of the refractory structural member according to the present embodiment is as follows. That is, this method produces a flame-retardant treated wood material 21 in which a drug-treated wood board 27 impregnated with a flame-retardant agent and an untreated wood board 28 not impregnated with a flame-retardant agent are stacked in the thickness direction. It has a process. This production process includes a wood board preparation process for preparing the drug-treated wood board 27 and the untreated wood board 28, respectively, and the untreated wood board 28 and the drug-treated wood board 27 so that the untreated wood board 28 becomes one of the outermost layers in the board thickness direction. Are laminated in the plate thickness direction, and the wooden boards are bonded to each other by a thermosetting adhesive applied to the plate surface, and the laminate 90 is manufactured while the laminate 90 is heated. And a hot pressing step of applying pressure to the body 90 in the thickness direction.

  This method also includes a preparation step for preparing the load support portion 10 and a pasting step for attaching the flame-retardant treated wood material 21 to the surface 11 of the load support portion 10. In the attaching step, the flame-retardant treated wood material 21 is attached to the surface 11 of the load support portion 10 so that the untreated wood board 28 is adhered to the surface 11 of the load support portion 10 via an adhesive.

  According to this method, after impregnating a wooden board (single board) with a flame retardant, the wooden board 21 is obtained by stacking and adhering the wooden boards together. For this reason, compared with the case where a flame retardant chemical | medical agent is impregnated after carrying out laminated adhesion of wooden boards, a flame retardant chemical | medical agent can be impregnated uniformly. Moreover, since the wooden boards are bonded to each other by hot-pressure bonding using a thermosetting adhesive, it is possible to reliably bond the wooden boards regardless of the affinity between the flame retardant and the adhesive. .

(Embodiment 2)
Next, the fireproof structural member 2 according to Embodiment 2 of the present invention will be described with reference to FIG. This refractory structural member 2 basically has the same configuration as the refractory structural member 1 according to the first embodiment and has the same effect, but is the same as the first embodiment in that it is a building beam. It differs from the fireproof structural member 1 which concerns. Only differences from the first embodiment will be described below.

  As shown in FIG. 5, in the fire-resistant structural member 2, among the four surfaces 11 of the load support portion 10, three surfaces 11 are covered with the inner flame-retardant treated wood material 21 </ b> A, while the remaining one surface 11 is the inner surface. It is not covered with the flame-retardant treated wood material 21A. That is, the one surface 11 is exposed to the outside. Further, the end surfaces of the inner flame-retardant treated wood material 21A and the outer flame-retardant treated wood material 21B are flush with the exposed surface 11 of the load support portion 10. Even in such a configuration, as in the case of the first embodiment, it is possible to sufficiently secure the adhesive force of the inner flame-retardant treated wood material 21 </ b> A to the surface 11 of the load support portion 10.

(Other embodiments)
In the said Embodiment 1, 2, although the load support part 10 demonstrated the fireproof laminated material which consists of a laminated material (wood), the fireproof structural member of this invention is not limited to this. A configuration in which the flame-retardant treated wood material 21 is bonded to the surface 11 of the load support portion 10A made of, for example, a square steel pipe or the like may be employed as in the fireproof structural member 3 shown in FIG. In this case, the flame-retardant-treated wood material 21 can suppress the temperature rise of the load support portion 10A, and the thermal deformation of the load support portion 10A can be suppressed.

  Further, as in the fire-resistant structural member 4 shown in FIG. 7, a configuration is adopted in which a flame-retardant treated wood material 21 is adhered to the surface 11 of a load support portion 10B made of, for example, carbon fiber reinforced plastic (CFRP: Carbon Fiber Reinforced Plastics). May be. In this case, as in the first and second embodiments, the flame retardant treated wood material 21 can prevent combustion of the load support portion 10B.

  In order to confirm the effect of the present invention, the following tests were conducted.

(Adhesion performance evaluation test)
First, a flame-retardant treated wood material (flame-retardant treated LVL) was produced by the following procedure. First, eight cedar veneers having a thickness of 3.8 mm were prepared as untreated wood boards. Then, 6 sheets of cedar veneer were impregnated with a flame retardant chemical (New Barnex S) to obtain 6 pieces of chemical-treated wood board (chemical weight 250 kg, 300 kg).

  Next, a laminate was produced in which six drug-treated wooden boards were sandwiched between two untreated wooden boards. At this time, the main agent (resorcinol resin, TW-28), the curing agent slurry (curing agent 30S for D) and the filler (hot P-2) are 100: 20: 10-13 as adhesives for bonding the wooden boards together. What was mix | blended in the ratio of was used. Moreover, what was mix | blended so that the ratio of the hardening agent 30S for D and water might be set to 9:11 was used as a hardening | curing agent slurry.

The application amount of the adhesive was 160 g / m ² or more, and the production time of the laminate was within 10 minutes. And the laminated body was arrange | positioned in a press apparatus, and the hot pressure was performed on the conditions of the heating temperature of 140 degreeC, the press pressure of 0.8 MPa, and the pressurization time for 20 minutes. Thereafter, the front and back surfaces (untreated wood board) of the laminate were ground so that the thickness of the laminate was 25 mm. A plurality of flame-retardant treated LVLs were produced by such a procedure.

  Next, as shown in FIG. 2, the prepared flame retardant treatment LVL was bonded to the surface of a load support portion made of a 120 mm square laminated material so as to have a two-layer structure. At this time, the secondary adhesion part (reference sign “LS” in FIG. 2) between the load support part and the inner flame retardant treatment LVL and the secondary adhesion part (in FIG. 2) between the inner flame retardant treatment LVL and the outer flame retardant treatment LVL. In this case, an adhesive in which the main agent (TW-36) and a powdery curing agent (D curing agent) were blended at a ratio of 100: 15 was used.

The application amount of the adhesive was about 800 g / m ^2, and the time from the start of application of the adhesive to the start of pressing was within 20 minutes. Thereafter, the flame retardant treatment LVL was pressed against the surface of the load support portion at a pressure of 1 MPa overnight to produce a fireproof laminated material.

  About the produced fireproof laminated material, the block shear test and the knife test were each performed. The block shear test was performed by collecting test pieces including the secondary adhesion portions LS and LL in FIG. 2 in accordance with the Japanese Agricultural Standard (JAS) of the single-plate laminated material. The knife test is performed by cutting a 5 cm square test piece so as to include the secondary bonded portions LS and LL, and confirming the rupture rate (%) of the wood portion when forcedly peeling off at the secondary bonded portions LS and LL. went.

  In addition, as a comparative example, a flame retardant treatment LVL in which a flame retardant was impregnated into all eight cedar veneers was also produced. And this flame-retardant process LVL was adhere | attached on the surface of the load support part, and the block shear test and the knife test were each performed similarly to the said Example.

  Table 1 shows the results of the block shear test and the knife test performed for the above-described Examples and Comparative Examples for each chemical treatment amount. “Adhesive layer surface” in Table 1 indicates the secondary adhesive portions LS and LL viewed from the A1 direction in FIG. 2, and “Laminated surface” indicates the secondary adhesive portions LS and LL viewed from the A2 direction. Each is shown.

  As shown in Table 1, in the examples, an improvement in shear strength was observed in any secondary bonded portion as compared with the comparative example. Further, in the case of the comparative example, there was a secondary bonded portion having a xylem rupture rate of less than 100% in both the block shear test and the knife test, whereas in the case of the example, all the secondary bond portions were present. The rupture rate of the xylem at the bonded part was 100%. From this test result, by using a flame retardant untreated wood board not impregnated with a flame retardant agent for a secondary adhesion part (an adhesion part between a load support part and a flame retardant treatment LVL and an adhesion part between flame retardant treatment LVLs). It was found that the adhesive strength was improved.

(Fire resistance test)
First, in the same manner as the above-mentioned adhesion performance evaluation test, a fireproof laminated material that was fireproof coated with the flame retardant treatment LVL was produced. As the load support portion, a cedar laminated material for structure having a size of 600 mm square and a height of 3300 mm was used. As the flame retardant treatment LVL, two types having a thickness of 30 mm and a thickness of 35 mm were prepared in the same manner as in the adhesion performance evaluation test. And this flame-retardant treatment LVL was adhere | attached on the surface of the load support part so that it might become 2 layer structure. As the decorative layer, a cedar KD material having a thickness of 5 mm was used. Resorcinol resin adhesive (TW-28) was used for adhesion between the load supporting portion and the flame retardant treatment LVL, adhesion between the flame retardant treatment LVLs, and adhesion between the flame retardant treatment LVL and the decorative layer.

  Next, the fire resistance performance test was performed in the following procedure using the fire resistance laminated material produced. First, as shown in FIG. 8, an upper measurement position P1 that is 850 mm away from the upper end of the refractory laminate, an intermediate measurement position P2 that is 1650 mm away from the upper end, and a lower measurement position P3 that is 850 mm away from the lower end of the refractory laminate. In Fig. 8, eight thermocouples were installed at equal intervals on the surface of the load supporting portion (24 in total). The numbers from “1 to 24” in FIG. 8 indicate the thermocouples installed at the respective measurement positions. And the refractory laminated material in which the thermocouple was installed was arrange | positioned in a furnace, and the four surfaces of the refractory laminated material were each heated for 60 minutes according to the heating temperature curve of ISO834.

  9 and 10 are graphs showing temperature changes at the upper measurement position P1, FIGS. 11 and 12 are graphs showing temperature changes at the intermediate measurement position P2, and FIGS. 13 and 14 are graphs at the lower measurement position P3. It is a graph which shows a temperature change. The numbers given to the curves in the graphs of FIGS. 9 to 14 correspond to the thermocouple numbers in FIG. 8. In each graph, the curve indicated by the number with “′” indicates the result when the flame retardant treatment LVL with a thickness of 35 mm is used, and the curve indicated with the number without “′” indicates a difficulty with a thickness of 30 mm. The result at the time of using fuel processing LVL is shown.

  In addition, as a comparative example, a fire-resistant laminated material in which the surface of the load support portion is covered with a flame-retardant treatment LVL in which all of the eight cedar veneers are impregnated with a flame retardant agent is prepared, and the fire resistance performance test is similarly performed. It was. 15 is a graph showing the temperature change at the upper measurement position P1 of the comparative example, FIG. 16 is a graph showing the temperature change at the intermediate measurement position P2 of the comparative example, and FIG. 17 is at the lower measurement position P3 of the comparative example. It is a graph which shows a temperature change. In addition, the number attached | subjected to each curve in the graph of FIGS. 15-17 respond | corresponds with the number of the thermocouple in FIG. 8 similarly to the above.

  Based on the graphs of FIGS. 9 to 17, the following can be considered. In FIGS. 15 to 17 of the comparative example, the tendency of the temperature change is different on each of the upper side, middle and lower sides, and the temperature rise is remarkable at the four corners of the load support portion (the temperature is about 300 ° C. on the upper side and the lower side). Rose). On the other hand, in FIGS. 9 to 14 of the example, the same tendency of temperature change is observed on each of the upper side, the middle side, and the lower side, and a remarkable temperature rise is recognized at any position on the surface of the load support portion. There wasn't. Specifically, the average temperature at the four corners of the load support portion is about 175 ° C. in the case of the flame retardant treatment LVL having a thickness of 35 mm, and about 200 ° C. in the case of the flame retardant treatment LVL having a thickness of 30 mm. However, it was below the carbonization temperature (about 210-260 degreeC) of wood. From this result, it was found that the fire resistance performance of 60 minutes can be realized by using the flame retardant treatment LVL in which the untreated wood board not impregnated with the flame retardant agent is the front and back layers as the flame stop layer.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1, 2, 3, 4 Fire-resistant structural member 10, 10A, 10B Load support portion 11 Surface 20 Flame-stopping layer 21 Flame-retardant treated wood material 21A Inner flame-retardant treated wood material 21B Outside flame-retardant treated wood material 24 Outer layer material 25 Inner layer material 26 Core material 27 Wood board

Claims (5)

It is a flame-retardant treated wood material that is bonded to the surface of the load supporting part of the fire-resistant structural member,
A plate-like core material impregnated with a flame retardant agent;
An inner layer material made of a wooden board including an adhesive surface bonded to the surface of the load supporting portion, which overlaps the core material in the thickness direction and is heat-pressure bonded to the core material with a thermosetting adhesive. And comprising
The flame retardant treated wood material, wherein the inner layer material is a flame retardant untreated material not impregnated with the flame retardant agent. It comprises a wooden board that sandwiches the core material in the thickness direction together with the inner layer material, and further comprises an outer layer material that is heat-pressure bonded to the core material with a thermosetting adhesive,
The flame retardant treated wood material according to claim 1, wherein the outer layer material is a flame retardant untreated material not impregnated with the flame retardant agent.   3. The flame-retardant treated wood material according to claim 1, wherein a thickness of the inner layer material is 0.5 mm or more and 10 mm or less.   The core material includes a plurality of wooden boards impregnated with the flame retardant agent, and the plurality of wooden boards overlap each other in the thickness direction and are heat-bonded to each other with a thermosetting adhesive. The flame-retardant treated wood material according to any one of claims 1 to 3, wherein A fire-resistant structural member used as a structural member of a fire-resistant wooden building,
A load support part for supporting the load of the building;
A flame stop layer that is bonded to cover the surface of the load support portion and prevents combustion or heat propagation to the load support portion, and
A fireproof structural member, wherein the flame stop layer is composed of the flame-retardant treated wood material according to any one of claims 1 to 4.

Images