Interconnection structure between wooden structural members and partition walls

Abstract

To provide a fitting structure between a wooden structural member and a partition wall that ensures fire resistive performance.SOLUTION: A fitting structure 10 is at a fitting section between a wooden structural member 12 and a partition wall 14 fitted on outside thereof, the wooden structural member comprising a core material 16 made of a load-supporting laminate lumber, a second flame-stopping layer 18 provided on outside of the core material 16 and made of an inorganic material having heat absorbing and heat insulating properties, and a sheet-form first flame-stopping layer 20 fitted on outside of the second flame stopping layer 18 and demonstrating the heat insulating property by increasing in thickness when heated, and the partition wall 14 is fitted directly on an outer surface of the first flame-stopping layer 20, with a filler 38 provided in a gap between an underlayer material 32 of the partition wall 14 and the first flame-stopping layer 20, the filler disappearing or reducing in volume when heated.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a coupling structure between a wooden structural member provided with a fire-resistant sheet, for example, and a partition wall.

Background Art

[0002] Conventionally, the applicant of this patent has developed "Slim Fireproof Wood (registered trademark)" as a wooden structural member having fire resistance, and has received approval from the Minister of Land, Infrastructure, Transport and Tourism for columns and beams. This wooden structural member has a structure in which two 15-mm-thick reinforced gypsum boards and one 2-mm-thick fire-resistant sheet are attached as fire-resistant coating materials around the wood that is a load-bearing member, and a decorative material for the wood is provided thereon.

[0003] Regarding such a configuration, the applicant of this patent has already proposed Patent Document 1. The fireproof laminated wood described in this Patent Document 1 includes a core material made of laminated wood that supports a load, a second fire-stopping layer made of an inorganic material provided on the outside of the core material and having heat absorption and heat insulation properties, a sheet-shaped first fire-stopping layer provided on the outside of the second fire-stopping layer and having increased thickness by heating to exhibit heat insulation properties, and a finishing material provided on the outside of the first fire-stopping layer. The second fire-stopping layer, the first fire-stopping layer, and the finishing material correspond to the reinforced gypsum board, the fire-resistant sheet, and the decorative material of the above-described wooden structural member, respectively.

[0004] On the other hand, secondary members such as sashes and partition walls are often attached to columns and beams. In a structure in which a secondary member is attached to a column or beam of the above-described wooden structural member, it is necessary to ensure a predetermined fire resistance. In particular, regarding the coupling portion with the secondary member, it is required to have a specification in which the fire resistance does not deteriorate. [[ID=二十一]]

[0005] As a conventional technique for solving such a problem, there is known a technique in which a reinforced gypsum board is provided at the joint portion between a wooden member and a wall to suppress the temperature rise of the wooden member and prevent the intrusion of flames to the non-heated surface side (for example, see Patent Document 2).

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2015-129431 [Patent Document 2] Japanese Patent Publication No. 2015-40431 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Incidentally, when partition walls are attached to the columns and beams of the above-mentioned wooden structural members, the following factors may prevent the guaranteed fire resistance performance from being ensured at the joints of the partition walls and their surroundings. For example, if runners, studs, or boards within the partition wall hinder the foaming of the fire-resistant sheet during fire heating, the guaranteed fire resistance performance cannot be ensured. Also, if the fire-resistant sheet does not foam at the joint between the fire-resistant sheet and the partition wall, and flame penetration to the unheated side or a rapid temperature rise occurs, the guaranteed fire resistance performance cannot be ensured. For this reason, it was required to ensure the guaranteed fire resistance performance at the joints of the partition walls and their surroundings.

[0008] The present invention has been made in view of the above, and aims to provide a joint structure between a wooden structural member and a partition wall that can ensure fire resistance. [Means for solving the problem]

[0009] To solve the above-mentioned problems and achieve the objective, the joint structure between a wooden structural member and a partition wall according to the present invention is a structure for the joint portion of a partition wall attached to the outside of a wooden structural member, comprising a core material made of laminated timber that supports a load, a second fire-stopping layer made of an inorganic material having heat-absorbing and heat-insulating properties and provided on the outside of the core material, and a sheet-like first fire-stopping layer provided on the outside of the second fire-stopping layer that thickens upon heating to exhibit heat insulation properties, wherein the partition wall is directly attached to the outer surface of the first fire-stopping layer, and a filler material that disappears or decreases in volume upon heating is provided in the gap between the overlay material of the partition wall and the first fire-stopping layer.

[0010] Furthermore, the joint structure between another wooden structural member and a partition wall according to the present invention is a joint structure for a partition wall attached to the outside of a wooden structural member, which comprises a core material made of laminated timber that supports a load, a second fire-stopping layer made of an inorganic material having heat-absorbing and heat-insulating properties and provided on the outside of the core material, and a sheet-like first fire-stopping layer provided on the outside of the second fire-stopping layer that thickens upon heating to exhibit heat-insulating properties, wherein the partition wall is attached to a base material provided on the outer surface of the first fire-stopping layer, and this base material is made of an inorganic material having heat-absorbing and heat-insulating properties.

[0011] Furthermore, the joint structure between other wooden structural members and partition walls according to the present invention is characterized in that the thickness of the base material is 15 mm or more, as in the invention described above. [Effects of the Invention]

[0012] The present invention provides a joint structure for a wooden structural member and a partition wall, comprising a core material made of laminated timber that supports a load, a second fire-stopping layer made of an inorganic material having heat-absorbing and heat-insulating properties and provided on the outside of the core material, and a sheet-like first fire-stopping layer provided on the outside of the second fire-stopping layer that thickens upon heating to exhibit heat insulation properties, wherein the partition wall is directly attached to the outer surface of the first fire-stopping layer, and a filler material that disappears or decreases in volume upon heating is provided in the gap between the overlay material of the partition wall and the first fire-stopping layer, so that when heated by fire the filler material disappears or decreases in volume, a space is formed for the first fire-stopping layer to thicken. As a result the first fire-stopping layer can perform its normal function, and therefore the fire-resistant performance of the joint portion of the partition wall can be ensured.

[0013] Furthermore, according to another joint structure between a wooden structural member and a partition wall according to the present invention, the joint structure of a partition wall attached to the outside of a wooden structural member comprises a core material made of laminated timber that supports a load, a second fire-stopping layer made of an inorganic material having heat-absorbing and heat-insulating properties and provided on the outside of the core material, and a sheet-like first fire-stopping layer provided on the outside of the second fire-stopping layer that thickens upon heating to exhibit heat-insulating properties. In this structure, the partition wall is attached to a base material provided on the outer surface of the first fire-stopping layer, and since this base material is made of an inorganic material having heat-absorbing and heat-insulating properties, it is possible to suppress flame penetration and rapid temperature rise from the joint between the first fire-stopping layer and the partition wall to the unheated surface side during fire heating. Therefore, it has the effect of ensuring the fire resistance performance of the joint of the partition wall.

[0014] Furthermore, according to the joint structure between other wooden structural members and partition walls of the present invention, since the thickness of the base material is 15 mm or more, it has the effect of improving the fire resistance performance of the joint. [Brief explanation of the drawing]

[0015] [Figure 1]FIG. 1 is a schematic cross-sectional view showing Embodiment 1 of the attachment structure between a wooden structural member and a partition wall according to the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view showing Embodiment 2 of the attachment structure between a wooden structural member and a partition wall according to the present invention. [Figure 3] FIG. 3 is a list view showing the specifications of the test specimens. [Figure 4] FIG. 4 is a view showing the temperature measurement positions of the test specimens. [Figure 5] FIG. 5 is a view showing the time change of the core material temperature of the test specimens.

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the attachment structure between a wooden structural member and a partition wall according to the present invention will be described in detail based on the drawings. Note that the present invention is not limited by this embodiment.

[0017] (Embodiment 1) First, Embodiment 1 of the present invention will be described.

[0018] As shown in FIG. 1, the attachment structure 10 between the wooden structural member and the partition wall according to the present embodiment is a structure of the attachment portion of the partition wall 14 directly attached to the outside of the wooden structural member 12.

[0019] The wooden structural member 12 includes a core material 16 made of laminated wood that supports a load, a second fire-stopping layer 18 made of an inorganic material provided on the outer surface of the core material 16 and having heat absorption and heat insulation properties, a sheet-like first fire-stopping layer 20 provided on the outer surface of the second fire-stopping layer 18 and thickening by heating to exhibit heat insulation properties, and a finishing material 22 provided outside the first fire-stopping layer 20. The spaces between the core material 16, the second fire-stopping layer 18, and the first fire-stopping layer 20 are joined with an adhesive or the like. The wooden structural member 12 of the present embodiment assumes a column made of the above-mentioned "Slim Fireproof Wood (registered trademark)", but the present invention is not limited thereto.

[0020] The second fire-stopping layer 18 is composed of two layers of reinforced gypsum boards 18A laminated in the thickness direction. The first fire-stopping layer 20 is composed of a foaming refractory sheet 20A that foams upon heating. Although the thickness of one reinforced gypsum board is assumed to be about 15 mm and the thickness of the refractory sheet is assumed to be about 2 mm, the present invention is not limited thereto. The finish material 22 is composed of a wooden decorative material and is attached to the outer surface of the refractory sheet 20A via a wooden edge 24.

[0021] The partition wall 14 is a wall body including a runner 26, a stud 28, a bottom material 30, a top material 32, and a heat insulating material 34, and is attached to a part outside the wooden structure member 12. The finish material 22 is not provided at the attachment location of the partition wall 14. In the present embodiment, it is assumed that a space of about 10 to 30 mm is provided between the partition wall 14 and the end of the finish material 22.

[0022] The runner 26 is a channel steel arranged in the wall width direction (left-right direction in the figure) at the upper and lower ends of the wall body. The stud 28 is a channel steel arranged in the vertical direction between the upper and lower runners 26, and a plurality of them are provided at intervals in the wall width direction. The bottom material 30 is composed of a reinforced gypsum board and is attached to both outer sides of the stud 28. The top material 32 is composed of a hard gypsum board and is pasted on the outer surface of the bottom material 30. The heat insulating material 34 is composed of glass wool and is filled and arranged in the space surrounded by the bottom materials 30 on both sides. Although the thickness of the reinforced gypsum board is assumed to be about 20 mm and the thickness of the hard gypsum board is assumed to be about 10 mm, the present invention is not limited thereto.

[0023] The gap (joint) between the underlayment material 30 and the fire-resistant sheet 20A is filled with fire-resistant joint material 36. The gap (joint) between the overlayment material 32 and the fire-resistant sheet 20A is filled with sealing material 38. These measures improve sound insulation. Furthermore, this sealing material 38 is a filler that disappears when heated. For the sealing material 38, for example, a urethane-based sealing material may be used, or an organic sealing material other than urethane may be used. Alternatively, a sealing material combining these may be used.

[0024] According to this embodiment, when heated by fire, the sealing material 38 disappears, creating a gap in this area. This provides space for the fire-resistant sheet 20A to expand. As a result, the fire-resistant sheet 20A can perform its normal function and its fire resistance can be guaranteed. Therefore, even if the partition wall 14 is directly attached to the fire-resistant sheet 20A, the same fire resistance performance as that of individual columns or beams can be ensured at the joints of the partition wall 14 and its surroundings. Furthermore, because this embodiment involves directly attaching the partition wall to the fire-resistant sheet, it offers superior workability and construction cost compared to specifications where the partition wall is not directly attached to the fire-resistant sheet.

[0025] (Embodiment 2) Next, Embodiment 2 of the present invention will be described.

[0026] As shown in Figure 2, the joint structure 100 between the wooden structural member and the partition wall according to this second embodiment is a structure in which a base material 40 is joined to the surface of the fire-resistant sheet 20A in the joint structure 10 of the first embodiment described above, and the partition wall 14 is attached to this base material 40. Therefore, in this second embodiment, the partition wall 14 is attached to the wooden structural member 12 via the base material 40.

[0027] The base material 40 is an inorganic material having heat absorption and heat insulation properties, and in this embodiment, it is made of reinforced gypsum board with a rectangular cross-section. The thickness D of the base material 40 is preferably as thick as possible, but to ensure fire resistance for one hour, it is desirable to have a thickness of, for example, 15 mm or more. The base material 40 is fixed to the underlayment material 30 with screws and adhesive.

[0028] The gap (joint) between the underlayment 30 and the base material 40 is filled with fire-resistant joint material 36. The gap (joint) between the overlayment 32 and the base material 40 is filled with sealant 38. These measures improve sound insulation. Furthermore, the sealant 38 is a filler that disappears when heated. For the sealant 38, for example, a urethane-based sealant may be used, or an organic sealant other than a urethane-based sealant may be used. Alternatively, a sealant combining these may be used.

[0029] According to this embodiment, since the runners 26, studs 28, underlayment 30, and overlayment 32 remain during and after fire heating, foaming of the fire-resistant sheet 20A is suppressed. However, by providing the base material 40, it is possible to suppress flame penetration and rapid temperature rise from the joint between the fire-resistant sheet 20A and the partition wall 14 to the non-heated side during fire heating. Therefore, the same fire resistance performance as that of individual columns and beams can be ensured at the joint of the partition wall 14 and its surroundings. As a result, even if the fire-resistant sheet 20A does not foam during fire heating, it is possible to prevent the core material temperature of the columns and beams at the joint from exceeding 260°C and carbonizing.

[0030] (Verification of the effects of the present invention) Next, we will describe the tests and results conducted to verify the effects of the present invention.

[0031] As test specimens, specimens with the cross-sectional shapes shown in Figures 1 and 2 were prepared. Figure 3 shows the specifications of the test specimens. As shown in this figure, specimen A has a structure without a base material 40, and specimen B has a structure with a base material 40. The wooden structural member 12 was made of the above-mentioned "Slim Fire-Resistant Wood (registered trademark)". For the partition wall 14, a fire-resistant partition wall with 1-hour fire resistance performance was used. The partition wall 14 was installed by first attaching the runner 26 and then erecting the studs 28, then attaching the underlayment 30 (reinforced gypsum board GB-F(V), 21 mm thick) and the toplayment 32 (hard gypsum board GB-RH, 9.5 mm thick) in that order to one side, and then filling the gaps of the studs 28 with glass wool (24 kg / m³) as insulation material 34. 3 The process involved inserting a 50mm thick sheet and then attaching the underlayment and toplay to the remaining side. Fire-resistant joint material 36 was provided at the junction between the underlayment 30 and the base material 40 or fire-resistant sheet 20A, and gaps were filled with urethane-based sealant 38 at the junction between the toplayment 32 and the base material 40 or fire-resistant sheet 20A. For the base material 40 of test specimen B, a 15mm thick reinforced gypsum board was used and attached to the fire-resistant sheet 20A. The reinforced gypsum board was attached using a combination of gypsum board screws and adhesive (vinyl acetate resin adhesive).

[0032] Fire resistance tests were conducted on the prepared test specimens A and B, and the internal temperature of the test specimens was measured. This allowed us to investigate the 1-hour fire resistance performance at the joints of the partition walls. Figure 4 shows the temperature measurement locations in test specimen A. The temperature measurement locations in test specimen B were set similarly. Figure 5 shows the time course of the core material temperature at each measurement location in test specimen A. As shown in this figure, in the case of test specimen A, the core material temperature at the joint reached a maximum of 100.1°C, which was below the temperature at which the core material would carbonize. The back surface temperature at the joint reached a maximum of 67.2°C and an average of 62.7°C, which was below the allowable temperature (maximum temperature 208°C, average temperature 168°C). Furthermore, visual observation after the experiment revealed no discoloration or carbonization of the core material around the joints of the partition walls in both test specimens A and B. In addition, no flame penetration or temperature rise exceeding 100°C was observed at the joints in either test specimen A or B.

[0033] These experimental results show that, as in test specimen A, when a partition wall is attached directly to a fire-resistant sheet without a base material such as reinforced gypsum board, applying an organic sealant to the gap between the overlay material and the fire-resistant sheet ensures fire resistance because the sealant disappears during fire heating, creating space for the fire-resistant sheet to expand. Therefore, the same fire resistance performance as that of individual columns and beams can be ensured at the joints of partition walls and their surroundings.

[0034] Furthermore, in test specimen B, foaming of the fire-resistant sheet is suppressed because runners, studs, and boards remain during and after fire heating. However, by providing a 15mm thick reinforced gypsum board base material, flame penetration and rapid temperature rise from the junction between the fire-resistant sheet and the partition wall to the unheated side can be suppressed. Therefore, the same fire resistance performance as that of individual columns and beams can be ensured at the junction of the partition wall and its surroundings.

[0035] As described above, the joint structure between a wooden structural member and a partition wall according to the present invention is a structure for the joint portion of a partition wall attached to the outside of a wooden structural member, which comprises a core material made of laminated timber that supports a load, a second fire-stopping layer made of an inorganic material having heat absorption and heat insulation properties and provided on the outside of the core material, and a sheet-like first fire-stopping layer provided on the outside of the second fire-stopping layer that thickens when heated to exhibit heat insulation properties. The partition wall is directly attached to the outer surface of the first fire-stopping layer, and a filler material that disappears or decreases in volume when heated is provided in the gap between the overlay material of the partition wall and the first fire-stopping layer. As a result, when heated by fire, the filler material disappears or decreases in volume, creating a space for the first fire-stopping layer to thicken. This allows the first fire-stopping layer to perform its normal function. Therefore, the fire resistance performance of the joint portion of the partition wall can be ensured.

[0036] Furthermore, according to another joint structure between a wooden structural member and a partition wall according to the present invention, the joint structure of a partition wall attached to the outside of a wooden structural member comprises a core material made of laminated timber that supports a load, a second fire-stopping layer made of an inorganic material having heat absorption and heat insulation properties and provided on the outside of the core material, and a sheet-like first fire-stopping layer provided on the outside of the second fire-stopping layer that thickens when heated and exhibits heat insulation properties, wherein the partition wall is attached to a base material provided on the outer surface of the first fire-stopping layer, and since this base material is made of an inorganic material having heat absorption and heat insulation properties, it is possible to suppress flame penetration and rapid temperature rise from the joint between the first fire-stopping layer and the partition wall to the unheated surface side when heated by fire.Therefore, the fire resistance performance of the joint of the partition wall can be ensured.

[0037] Furthermore, according to the other wood structural member and partition wall joint structure of the present invention, since the thickness of the base material is 15 mm or more, the fire resistance performance of the joint can be improved. [Industrial applicability]

[0038] As described above, the joint structure between a wooden structural member and a partition wall according to the present invention is useful when a partition wall is attached to the outside of a fire-resistant wooden structural member, and is particularly suitable for ensuring the fire resistance of the joint portion of the partition wall. [Explanation of Symbols]

[0039] 10,100 Interconnection structure between wooden structural members and partition walls 12. Wooden structural members 14 Partition walls 16 Core material 18. Second fire-stopping layer 18A Reinforced gypsum board 20. First fire-stopping layer 20A Fireproof Sheet 22 Finishing materials 24 purlins 26 Runners 28 studs 30 Underlayment 32 Upholstery material 34. Insulation 36 Fireproof joint material 38. Sealing material (filler) 40. Underlayment D Thickness

Claims

1. A structure for the joint portion of a partition wall attached to the outer surface of the first fire-stop layer of a wooden structural member, comprising a core material made of laminated timber that supports a load, a second fire-stop layer made of an inorganic material having heat-absorbing and heat-insulating properties provided on the outside of the core material, and a sheet-like first fire-stop layer provided on the outside of the second fire-stop layer that thickens upon heating to exhibit heat insulation properties, The partition wall is a wall structure comprising an underlayment and an overlayment attached to the outer surface of the underlayment, and is attached to a base material provided on the outer surface of the first fire-stopping layer, and this base material is made of an inorganic material having heat-absorbing and heat-insulating properties. A filler material that disappears or decreases in volume due to heating is filled between the end of the overlay material and the outer surface of the base material. A joint structure between a wooden structural member and a partition wall, characterized in that a fire-resistant joint material is filled between the end of the underlayment material and the outer surface of the base material.

2. The joint structure between a wooden structural member and a partition wall according to Claim 1, characterized in that the thickness of the base material is 15 mm or more.

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