Joint structure and construction method

Abstract

To provide a joint structure capable of improving workability and securing fire resistance performance, and a method for constructing the same.SOLUTION: A joint structure 100 is formed in a joint part 16 of a fire-resistive covering material 14 provided on the outside of a structural member 12 and is provided with a first joint material 18 provided to cover the outside of the structural member 12 of the joint part 16 and composed of a paste-like shapeless fire-resistive material having thermal insulation, and a second joint material 20 provided on the outside of the first joint material 18 and composed of a paste-like shapeless material having deformation followability.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint structure having fire resistance and a construction method thereof. [Background technology]

[0002] Conventionally, in fire-resistant structures, when a fire-resistant covering material is applied to the outer surface of a structural member, the workability is improved by providing joints in the fire-resistant covering material. However, since it is necessary to ensure fire resistance in the joints as well, a structure is required in which the joints are filled with a joint material that has heat-shielding properties. One such structure is known to have a fixed joint material such as rock wool placed in the joints (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 3-122336 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of diagonal joints where the joints run diagonally, it is necessary to shape the standard joint material diagonally, which can reduce workability. For this reason, there was a need for a joint structure that could improve workability while also ensuring fire resistance.

[0005] The present invention has been made in consideration of the above, and aims to provide a joint structure and a construction method thereof that can improve workability and ensure fire resistance. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the joint structure of the present invention is a joint structure formed in a joint portion of a fire-resistant covering material provided on the outside of a structural member, and is characterized by comprising: a first joint material provided to cover the outside of the structural member at the joint portion and made of a paste-like amorphous fire-resistant material with heat-shielding properties; and a second joint material provided on the outside of this first joint material and made of a paste-like amorphous material with deformation-following properties.

[0007] Furthermore, another joint structure according to the present invention is characterized in that, in the above-mentioned invention, the joint portion is an oblique joint portion that runs diagonally with respect to the thickness direction of the fire-resistant coating material.

[0008] Another joint structure according to the present invention is characterized in that in the above-mentioned invention, the first joint material is a calcium carbonate-based sealant.

[0009] In addition, the construction method for a joint structure according to the present invention is a method for constructing the above-mentioned joint structure, characterized in that after filling a first joint material in the outer area of ​​the structural member of the joint portion, a second joint material is filled in the outer area of ​​this first joint material. [Effects of the Invention]

[0010] According to the joint structure of the present invention, the joint structure is formed in the joint portion of a fire-resistant covering material provided on the outside of a structural member, and is provided with a first joint material that is provided to cover the outside of the structural member at the joint portion and is made of a paste-like amorphous fire-resistant material with heat-shielding properties, and a second joint material that is provided on the outside of this first joint material and is made of a paste-like amorphous material with deformation-following properties, thereby achieving the effect of improving workability and ensuring fire-resistant performance.

[0011] In addition, according to another joint structure of the present invention, the joint portion is an oblique joint portion that runs diagonally relative to the thickness direction of the fire-resistant coating material, which has the effect of improving workability and ensuring fire resistance even in an oblique joint portion.

[0012] Furthermore, according to another joint structure of the present invention, the first joint material is a calcium carbonate-based sealing material, which is not likely to be burned down and has excellent heat-shielding properties, thereby achieving the effect of further improving fire resistance.

[0013] Furthermore, according to the construction method for a joint structure of the present invention, a method for constructing the above-mentioned joint structure is achieved in which a first joint material is filled in the area outside the structural member of the joint portion, and then a second joint material is filled in the area outside this first joint material, thereby achieving the effect of improving construction ease and ensuring fire resistance performance. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional view showing a joint structure and a construction method thereof according to a first embodiment of the present invention. [Figure 2] FIG. 2 shows a second embodiment of the joint structure and its construction method according to the present invention, where (1) is a plan view and (2) is a cross-sectional view. [Figure 3] FIG. 3 shows a third embodiment of the joint structure and its construction method according to the present invention, where (1) is a plan view and (2) is a cross-sectional view. [Figure 4] FIG. 4 is a cross-sectional view showing the test specimens used in the fire resistance test, (1) being an example and (2) being a comparative example. [Figure 5] FIG. 5 is a diagram showing the results of the fire resistance experiment (temperature transition). [Figure 6] FIG. 6 shows an example of a joint structure, where (1) is a plan view and (2) is a cross-sectional view. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of a joint structure and a construction method thereof according to the present invention will be described in detail with reference to the drawings, although the present invention is not limited to these embodiments.

[0016] (Embodiment 1) First, a first embodiment of the present invention will be described. As shown in Figure 1, the joint structure 100 of this embodiment 1 is a joint structure formed in a joint portion 16 of a fire-resistant coating material 14 provided on the outside of a structural member 12, and comprises a first joint material 18 provided to cover the outside of the structural member 12 at the joint portion 16, and a second joint material 20 provided on the outside of this first joint material 18.

[0017] The structural members 12 may be, for example, beams made of wooden members. The fire-resistant covering material 14 may be, for example, a fire-resistant covering material such as reinforced gypsum board, or a fire-resistant covering material such as a laminated structure of reinforced gypsum board, a fire-resistant sheet, and a wood-based decorative material.

[0018] The joints 16 are oblique joints that run diagonally relative to the thickness direction D (material thickness direction) of the fire-resistant covering material 14. The dimensions of the joints 16 can be, for example, a joint width W of 126 mm or less, a thickness d1 of the first joint material 18 of 30 mm or more, and an oblique angle θ of the joints 16 of 25°. Note that the joints of the present invention are not limited to oblique joints, and may be, for example, joints that run in the thickness direction D of the fire-resistant covering material 14.

[0019] The first joint material 18 is a paste-like, heat-shielding, unshaped refractory material that fills the recessed area defined by the outer surface 12A of the structural member 12 and the side end surface 14A of the fire-resistant covering material 14 in the joint 16. This first joint material 18 can be composed of, for example, a calcium carbonate-based sealant. Unlike conventional shaped joint materials, calcium carbonate-based sealants offer excellent workability because they do not need to be molded to fit the shape of the joint 16. Furthermore, the calcium carbonate, which is the primary material, is inorganic and therefore does not burn. Furthermore, the decomposition of calcium carbonate at temperatures around 600°C initiates an endothermic reaction, providing excellent heat-shielding properties. These benefits enable improved workability and guaranteed fire resistance, even in diagonal joints that were difficult to install using conventional technology.

[0020] The second joint material 20 is made of a paste-like amorphous material that has deformation-following properties, and is placed in the recessed area defined by the outer surface 18A of the first joint material 18 and the side end surface 14A of the fire-resistant covering material 14 in the joint portion 16. This second joint material 20 can be made of, for example, a silicone-based sealant that has excellent deformation-following properties.

[0021] When constructing the joint structure 100, for example, a fire-resistant coating material 14 is attached to the outer surface 12A of the structural member 12 to form a joint 16, and a first joint material 18 is filled and leveled in the area of ​​this joint 16 outside the structural member 12. Then, a second joint material 20 is filled and leveled in the area outside the first joint material 18. In this manner, the joint structure 100 can be constructed.

[0022] Furthermore, since it becomes difficult to install the second joint materials 18 and 20 as the joint depth increases, when multiple sheets of fire-resistant coating material 14 are stacked, it is desirable to fill and install the first joint material 18 and the second joint material 20 into the joint portion 16 after each sheet of fire-resistant coating material 14 is laid.

[0023] According to the first embodiment, it is possible to improve workability and ensure fire resistance. In particular, it is possible to improve workability and ensure fire resistance even in diagonal joints, which have been difficult to work with conventional techniques.

[0024] (Embodiment 2) Next, a second embodiment of the present invention will be described. As shown in FIG. 6, when joining a steel material such as a steel rod 22 diagonally to a structural member 12 (e.g., a beam made of wood), a conceivable structure is one in which the steel rod 22 is inserted diagonally into the structural member 12 through a diagonal joint 16 formed in the fire-resistant covering material 14. This example shows a case in which two layers of fire-resistant covering material 14 are stacked on the outside of the structural member 12. Also shown is a case in which the base portion 16 of the fire-resistant covering material 14 has a substantially rectangular shape when viewed from the front. A joint material is filled into the joint 16 to ensure fire resistance, so as to completely cover the periphery of the steel rod 22. Rock wool 24 is used as the joint material for the joint 16 of the first layer of fire-resistant covering material 14 attached to the structural member 12, and a silicone-based sealant 26 is used as the joint material for the joint 16 of the second layer of fire-resistant covering material 14 attached to the outside of the first layer. This makes it difficult for heat from the joint 16 to be transmitted to the structural member 12.

[0025] However, in the structure shown in Figure 6, because steel rods 22 are placed in the diagonal joints 16, processing the rock wool 24 may be time-consuming. Also, it is difficult to fill the rock wool 24 without leaving any gaps, which reduces workability. Therefore, in order to solve these problems, the joint structure according to the following second embodiment is applied.

[0026] As shown in Figure 2, a joint structure 200 according to the second embodiment is the same as the structure shown in Figure 6 except that a calcium carbonate-based sealant 28 is used instead of the rock wool 24. The calcium carbonate-based sealant 28 corresponds to the first joint material of the present invention, and the silicone-based sealant 26 corresponds to the second joint material of the present invention. In addition, a fire-resistant paint 30 is applied to the portion where the steel rod 22 penetrates the joint 16. The gap width W1 between the fire-resistant paint 30 and the fire-resistant covering material 14 can be, for example, 7 mm.

[0027] According to the second embodiment, the processing of the rock wool 24 is eliminated, improving workability. In addition, the heat-absorbing effect of the calcium carbonate-based sealant 28 makes it possible to achieve heat-shielding performance equivalent to that of the structure shown in FIG. 6. Furthermore, the foaming of the fire-resistant paint 30 applied to the steel rod 22 makes it possible to prevent gaps from occurring between the steel rod 22 and the joint material. Therefore, it is possible to improve workability and ensure fire resistance.

[0028] (Embodiment 3) Next, a third embodiment of the present invention will be described. As shown in FIG. 3 , the joint structure 300 of the third embodiment is similar to the second embodiment, except that calcium carbonate sealant 28 replaces the silicone sealant 26 and rock wool 24 is also used as a shock absorber for vibration absorption. Therefore, the calcium carbonate sealant 28 corresponds to the first and second joint materials of the present invention. The calcium carbonate sealant 28 used as a filler for the joint 16 is susceptible to vibration, and using it alone may cause cracks on the surface and reduce thermal insulation performance. Therefore, the calcium carbonate sealant 28 is used as a filler and rock wool 24 is also used as a shock absorber for vibration absorption. The rock wool 24 is filled around the space between the side end surface 14A of the second fire-resistant coating material 14 and the calcium carbonate sealant 28.

[0029] According to the third embodiment, it is possible to improve workability and ensure fire resistance. In particular, by using the calcium carbonate-based sealant 28 instead of the silicone-based sealant 26, it is possible to improve heat-shielding performance and reduce construction costs. It is also possible to prevent cracking of the calcium carbonate-based sealant 28 due to vibration and a decrease in heat-shielding performance.

[0030] (Verification of the effects of the present invention) Next, a fire resistance experiment conducted to confirm the effects of the present invention will be described. The specifications of the test specimens used in the fire resistance experiment and the temperature measurement position P near the joint on the unheated side are shown in Figure 4. Figure 4(1) shows the test specimen of the example, and Figure 4(2) shows the test specimen (comparison example) with rock wool filling, which is a conventional technology.

[0031] The fire resistance test was a heating test in which the test specimens were placed in a fire resistance test furnace and heated for one hour according to the heating temperature-time curve specified in ISO 834-1. After heating, each test specimen was allowed to cool in the furnace.

[0032] As shown in the temperature measurement results in Figure 5, the maximum temperature near the joint on the non-heated side was 125°C for the Example and 188°C for the Comparative Example. Furthermore, in the Example, no gaps penetrating from the heated side to the non-heated side occurred. From the above, it was confirmed that the joint structure of the Example has the required fire resistance performance.

[0033] As described above, the joint structure of the present invention is a joint structure formed in a joint portion of a fire-resistant covering material provided on the outside of a structural member, and comprises a first joint material that is provided to cover the outside of the structural member at the joint portion and is made of a paste-like amorphous fire-resistant material with heat-shielding properties, and a second joint material that is provided on the outside of this first joint material and is made of a paste-like amorphous material with deformation-following properties, thereby making it possible to improve workability and ensure fire-resistant performance.

[0034] Furthermore, according to another joint structure of the present invention, the joint portion is an oblique joint portion that runs diagonally relative to the thickness direction of the fire-resistant coating material, so that even in an oblique joint portion, it is possible to improve workability and ensure fire resistance performance.

[0035] In addition, according to another joint structure of the present invention, the first joint material is a calcium carbonate-based sealing material, which is not likely to be burned down and has excellent heat-shielding properties, thereby further improving fire resistance.

[0036] Furthermore, according to the construction method for a joint structure of the present invention, a method for constructing the above-mentioned joint structure is provided in which a first joint material is filled in the outer area of ​​the structural member of the joint portion, and then a second joint material is filled in the outer area of ​​this first joint material, thereby improving workability and ensuring fire resistance. [Industrial Applicability]

[0037] As described above, the joint structure and construction method of the present invention are useful for joints to be provided in fire-resistant covering materials, and are particularly suitable for improving workability and ensuring fire resistance performance. [Explanation of symbols]

[0038] 12 Structural members 12A outer surface 14 Fireproof cladding 14A side end face 16 Joint 18 First joint material 20 Second joint material 22 Steel Rod 24 Rockwool 26 Silicone sealant 28 Calcium carbonate sealant 30 Fireproof paint D thickness direction 100~300 joint structure

Claims

1. A joint structure formed at a joint portion of a fire-resistant covering material provided on the outside of a structural member, A joint structure characterized by comprising a first joint material made of a paste-like amorphous fire-resistant material with heat-shielding properties, which is arranged to cover the outside of the structural member of the joint portion, and a second joint material made of a paste-like amorphous material with deformation-following properties, which is arranged on the outside of the first joint material.

2. 2. The joint structure according to claim 1, wherein the joint is an oblique joint that runs obliquely with respect to the thickness direction of the fire-resistant covering material.

3. 3. The joint structure according to claim 1, wherein the first joint material is a calcium carbonate-based sealing material.

4. A method for constructing the joint structure according to claim 1 or 2, A construction method for a joint structure, characterized in that a first joint material is filled in the outer area of ​​the structural member of the joint portion, and then a second joint material is filled in the area outside the first joint material.

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