Joint structure of building panels
The joint structure for building panels uses gaskets with specific density and compressive stress to ensure equal pressure sealing, addressing the challenge of maintaining watertightness in high-pressure environments without increasing installation difficulty or cost.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- NOZAWA CORP
- Filing Date
- 2024-11-22
- Publication Date
- 2026-06-03
AI Technical Summary
Existing joint structures for building panels struggle to maintain high watertightness in high-pressure environments without increasing installation difficulty or cost, as gaskets with high compressive stress are hard to insert, while those with low compressive stress may not provide adequate sealing.
A joint structure using vertical and horizontal gaskets with specific density and compressive stress properties, ensuring a minimal 10 kPa difference in compressive stress, made from materials like closed-cell ethylene propylene rubber and water-swellable polyurethane foam, which are easily insertable and maintain equal pressure sealing.
The joint structure achieves high watertightness in high-pressure environments by preventing air and water leakage, while maintaining ease of installation and avoiding cost increases, by using gaskets with defined density and compressive stress properties.
Smart Images
Figure 2026090753000001_ABST
Abstract
Description
[Technical Field]
[0001] This invention relates to a joint structure for exterior walls that has a waterproof function, and more particularly to a joint structure that improves the overall waterproof function of the joints of building panels that constitute an exterior wall. [Background technology]
[0002] In the joints of the building panels that make up the exterior walls, a backing material is inserted and then a sealant is filled in to maintain the waterproofing function. In such joint structures, a waterproof gasket is also sandwiched on the back side of the joint to enhance the waterproofing function of the exterior wall.
[0003] There are two methods for inserting a waterproof gasket into the joint on the back side: one is to insert the gasket into the joint after the building panel has been installed, and the other is to attach the gasket to the corresponding area of the building panel's joint beforehand before installation.
[0004] When installing building panels and then inserting gaskets into the joints on the back side, using high-density gaskets to achieve watertightness makes them difficult to compress, thus cumbersome to insert into the joints. Using low-density gaskets makes them easier to insert into the joints because they are softer, but high watertightness may not be achievable.
[0005] When installing building panels by pre-applying gaskets to the joints on the back side, using high-density gaskets makes it difficult to compress the gaskets, thus making adjustment between the joints difficult and time-consuming during installation. Using low-density gaskets makes adjustment between the joints easier due to their flexibility, but high watertightness may not be achievable.
[0006] In the joints of building panels, gaskets can be easily compressed by pre-attaching them to the shoulders of the protruding parts and compressing them during construction. However, in the butt joints, it is difficult to pre-attach gaskets, and the gaskets must be inserted during construction.
[0007] Patent Document 1 describes a joint structure for building panels in which a waterproof gasket is sandwiched along the joint on the back side of building panels that are laid vertically and horizontally, and this gasket has a density of 130 to 150 kg / m³ 3 The document describes a joint structure for building panels in which a gasket has physical properties of a compressive stress of 9-12 kPa at 30% compression, and is sandwiched in the back joint or void with a compression ratio of 20-40% relative to the joint width. [Prior art documents] [Patent Documents]
[0008] [Patent Document 1] Japanese Patent Publication No. 2019-214883 [Overview of the project] [Problems that the invention aims to solve]
[0009] The joint structure described in Patent Document 1 uses a gasket with a relatively low compressive stress of 9-12 kPa at 30% compression, making it easy to compress and work with, and ensuring watertightness even in a pressure environment of around 5000 Pa. However, if there is a pressure difference within the vertical joint, the horizontal joint, or both joints, water may flow in if air leaks from the joint in a pressure environment of around 5000 Pa. On the other hand, if a gasket with an excessively high compressive stress is used to achieve high watertightness, it becomes harder, making insertion during construction difficult, which reduces workability and increases costs.
[0010] In view of the problems of the prior art, the present invention aims to provide a joint structure for building panels that can always maintain high watertightness even in high-pressure environments of about 5000 Pa, while at the same time not causing an increase in cost. [Means for solving the problem]
[0011] The joint structure for building panels of the present invention is a joint structure for building panels that comprises waterproof vertical and horizontal gaskets sandwiched in the vertical and horizontal joints on the back side of building panels that are laid vertically and horizontally, the front vertical and horizontal gaskets having a density of 120 to 160 kg / m³ 3 The gasket has physical properties such as a compressive stress of 20 to 36 kPa when compressed by 25 to 30%, and is sandwiched between the vertical and horizontal joints when compressed to 25 to 30%, and is characterized in that the difference in compressive stress between the vertical gasket and the horizontal gasket in the sandwiched state is 10 kPa or less.
[0012] According to the present invention, the difference in compressive stress between the vertical and horizontal gaskets, which are sandwiched in the vertical and horizontal joints respectively with a compressibility of 25-30%, is 10 kPa or less. Therefore, the vertical and horizontal joints are sealed with approximately equal pressure, and the internal wall pressure and external air pressure can be brought closer to equal pressure. As a result, there is no airflow within the joint structure, air leakage from the joint is prevented, airtightness is maintained, and water intrusion can be prevented even in high-pressure environments of around 5000 Pa. Furthermore, the density of the vertical and horizontal gaskets is 120-160 kg / m³. 3 Because it is a versatile gasket with physical properties of a compressive stress of 20-36 kPa at 25-30% compression, it is easy to insert during installation and does not lead to increased costs.
[0013] By making the vertical gasket and the horizontal gasket from different materials, the watertight performance can be significantly improved. Examples of the vertical gasket and horizontal gasket include closed-cell ethylene propylene rubber or water-swellable polyurethane foam.
[0014] It is preferable that the vertical and horizontal gaskets are provided with a low-friction film on the leading edge surface that is inserted into the vertical and horizontal joints, respectively, to reduce friction. In this case, the vertical and horizontal gaskets can be easily inserted into the joints.
[0015] The vertical gasket or the horizontal gasket may be sandwiched in the gap between the building panel and the base material for attaching the building panel. Thereby, the effect of reducing air leakage from the joint portion is further enhanced, and the intrusion of water can be surely suppressed.
Advantages of the Invention
[0016] According to the present invention, the vertical joint portion and the horizontal joint portion are sealed with substantially equal pressure, and the internal wall pressure and the external air pressure can be brought close to an equal pressure. Therefore, the flow of air in the joint structure is eliminated, air leakage from the joint portion does not occur, airtightness is maintained, and the intrusion of water can be prevented. The vertical and horizontal gaskets have physical properties with a density of 120 to 160 kg / m 3 and a compression stress of 20 to 36 KPa when compressed by 25 to 30%. They are versatile gaskets, so the insertion work during construction is easy and does not cause cost increases.
Brief Description of the Drawings
[0017] <着 [Figure 1] T It is a longitudinal sectional view showing a joint portion structure (horizontal laying) of a building panel according to a first embodiment of the present invention. [Figure 2] It is a cross-sectional view of FIG. 1. [Figure 3] It is an exploded perspective view of the joint portion. [Figure 4] (a) is a perspective view showing a vertical gasket, and (b) is a perspective view showing a horizontal gasket. [Figure 5] It is a longitudinal sectional view showing a joint portion structure (vertical laying) of a building panel according to a second embodiment of the present invention. <着 [Figure 6] It is a cross-sectional view of FIG. 4. [Figure 7] It is an exploded perspective view of the joint portion. [Figure 8] (a) is a front view of an example and a comparative example with horizontal laying, and (b) is a front view of an example and a comparative example with vertical laying. C
Modes for Carrying Out the Invention
[0018] This invention improves watertightness by using a gasket made of closed-cell ethylene propylene rubber or water-swellable polyurethane foam having a specific density and compression performance in the joints on the back side of building panels that are laid vertically and horizontally, and by compressing the gasket at a specific compression ratio.
[0019] Generally, increasing the compression ratio of a gasket improves its watertightness, but it also increases the gasket's resilience, worsening joint width adjustment and reducing workability when inserting it into the joint. Therefore, in this invention, without significantly increasing the compression ratio, the difference in compressive stress between a general-purpose vertical gasket installed in vertical joints and a general-purpose horizontal gasket installed in horizontal joints is reduced, maintaining high watertightness without reducing workability. Furthermore, by appropriately changing the material of the general-purpose gasket for vertical and horizontal joints, it is possible to maintain high watertightness in both vertical and horizontal installations while maintaining workability.
[0020] Embodiments of the present invention will be described with reference to the drawings. Figure 1 is a vertical cross-sectional view showing the joint structure (horizontal) K1 of a building panel according to the first embodiment of the present invention, Figure 2 is a cross-sectional view of Figure 1, and Figure 3 is an exploded perspective view of the joint. In this embodiment, an example will be described in which extruded cement boards 1 are used horizontally as building panels installed vertically and horizontally.
[0021] Extruded cement board 1 is manufactured by extruding a mixture of cement, aggregate, fibers, admixtures, water, etc., through an extrusion molding machine and cutting it to a predetermined size. The extruded cement board 1 has multiple hollow sections formed in a rectangular cross-section, which are arranged parallel to each other in the longitudinal direction, which is the extrusion direction. The outer wall is made up of extruded cement boards 1 laid vertically and horizontally, and the spaces between adjacent extruded cement boards 1 are vertical joints 2 and horizontal joints 3 that are continuous in the vertical and horizontal directions.
[0022] Regarding the mounting structure of the extruded cement board 1, the extruded cement boards arranged vertically are provided so that their end protrusions and recesses fit together. The back side base material 1a of the extruded cement board 1 is sandwiched from the inside and outside, and the extruded cement board 1 is attached to the vertically continuous base material (CT steel material) 6 connected to the building's frame using Z-clips 7. As shown in Figure 3, the joints on the surface side of the upper and lower extruded cement boards 1 are filled from the outside with sealant 8 and backing material 9.
[0023] In this embodiment, vertical gaskets 10, which are continuous in the vertical direction, are filled into the vertical joints 2 on the back side of the upper and lower extruded cement boards 1, and horizontal gaskets 11, which are continuous in the horizontal direction, are filled into the horizontal joints 3. In this embodiment, the vertical gaskets 10 are continuous vertically without interruption across the multiple extruded cement boards 1. The horizontal gaskets 11 are provided so that their ends abut against the vertical gaskets 10 in the vertical joints 2. A fire-resistant and non-combustible material 12 is filled between the vertical gaskets 10 and the sealing material 8.
[0024] The vertical gasket 10 is made of water-expandable polyurethane foam, and the horizontal gasket 11 is made of closed-cell ethylene propylene rubber (EPDM). The vertical gasket 10 and the horizontal gasket 11 are made of different materials, and both have high compressive stress to make them impermeable to water and air. The closed-cell ethylene propylene rubber gasket has a high density and is difficult to compress by hand in the joint, so it is used as a gasket for the mating part.
[0025] In the fitting portion of the horizontal joint 3, by attaching the horizontal gasket 11 to the shoulder of the protrusion in advance, when installing the upper extruded cement board 1 after installing the lower extruded cement board 1, the horizontal gasket 11 can be attached while being compressed by the upper extruded cement board 1.
[0026] Figure 4(a) is a perspective view showing the vertical gasket, and (b) is a perspective view showing the horizontal gasket. In this embodiment, a PET film 13 is attached to the leading edge surface of the vertical gasket 10 that is pressed into the vertical joint 2, as a low-friction film to reduce friction during installation. The PET film 13 acts as a lubricant when inserted into the vertical joint 2, making insertion into the vertical joint 2 easier and facilitating position adjustment after insertion. Butyl tape 14 for attachment is provided on the mounting surface of the horizontal gasket 11.
[0027] The vertical gasket 10 and horizontal gasket 11 have a density of 120-160 kg / m³. 3 The material has a compressive stress of 20-36 kPa when compressed by 25-30%. The vertical gasket 10 is sandwiched in the vertical joint 2 with a compression ratio of 25-30% relative to the joint width. The horizontal gasket 11 is sandwiched in the horizontal joint 3 with a compression ratio of 25-30% relative to the joint width. The dimensions of the sandwiched vertical and horizontal gaskets 10 and 11 are set during gasket molding so that they have the above compression ratios.
[0028] The vertical gasket 10 in Figure 4(a) is formed with a width m: 20 mm and a height h: 15 mm, and the horizontal gasket 11 in Figure 4(b) is formed with a width m: 13 mm and a height h: 13.5 mm. These gaskets 10 and 11 are sandwiched in the vertical joint 2 and the horizontal joint 3, respectively.
[0029] In this embodiment, the width t1 of the vertical joint 2 is 15 mm, and a vertical gasket 10 with a width m of 20 mm is sandwiched there. By providing the 20 mm wide vertical gasket 10 in a 15 mm wide area, it is compressed by about 25%. In this embodiment, the width t2 of the horizontal joint 3 is 10 mm, and a horizontal gasket 11 with a width m of 13 mm is sandwiched there. By providing the 13 mm wide horizontal gasket 11 in a 10 mm wide area, it is compressed by about 23%.
[0030] The difference in compressive stress between the vertical gasket 10 and the horizontal gasket 11 is 3 kPa, so that the vertical joint 2 and the horizontal joint 3 are sealed with approximately equal pressure, and the internal wall pressure and external air pressure can be brought close to equal pressure. As a result, there is no airflow within the joint structure, no air leakage from the joint occurs, airtightness is maintained, and water intrusion can be prevented. By adjusting the material, shape, and dimensions of the vertical and horizontal gaskets 10 and 11, the difference in compressive stress can be reduced to 10 kPa or less, thereby achieving high watertightness.
[0031] The density of the vertical and horizontal gaskets 10 and 11 should be 120-160 kg / m³. 3 Furthermore, by setting the compressive stress of the gaskets 10 and 11 at 25-30% compression to 20-36 kPa, watertight performance in a pressure environment of approximately 5000 Pa can be ensured, and compression becomes easier, facilitating insertion into the joint.
[0032] Since the vertical and horizontal gaskets 10 and 11 are sandwiched in the vertical joint section 2 and horizontal joint section 3, respectively, with a compression ratio of 25-30% relative to the joint width, the rebound force during compression is increased, improving watertightness, while at the same time preventing the rebound force during compression from becoming excessively high, thus avoiding a decrease in workability.
[0033] By using different materials for the vertical gasket 10 and the horizontal gasket 11, the watertight performance can be significantly improved. The vertical and horizontal gaskets 10 and 11 have a density of 120-160 kg / m³. 3 Because it is a versatile gasket with physical properties of a compressive stress of 20-36 kPa at 25-30% compression, it is easy to insert during installation and does not lead to increased costs.
[0034] Figure 5 is a vertical cross-sectional view showing the joint structure (vertical installation) K2 of a building panel according to the second embodiment of the present invention, Figure 6 is a cross-sectional view of Figure 1, and Figure 7 is an exploded perspective view of the joint. In this embodiment, an example is given in which extruded cement boards 1 are used vertically as building panels installed vertically and horizontally.
[0035] The exterior wall is constructed of extruded cement boards 1 laid vertically and horizontally, with vertical and horizontal joints 2 and horizontal joints 3 forming continuous vertical and horizontal joints between adjacent extruded cement boards 1. The back side base material 1a of the extruded cement boards 1 is sandwiched from the inside and outside, and the extruded cement boards 1 are attached to horizontally continuous base material (CT steel material) 6 connected to the building's frame using Z clips 7. The joints on the surface side of the extruded cement boards 1 are filled from the outside with sealant 8 and backing material 9.
[0036] In this embodiment, vertical waterproof gaskets 10, which are continuous in the vertical direction, are filled into the vertical joints 2 on the back side of the extruded cement board 1, and horizontal waterproof gaskets 11, which are continuous in the horizontal direction, are filled into the horizontal joints 3. In this embodiment, the vertical gaskets 10 are continuous vertically without interruption across multiple extruded cement boards 1. The horizontal gaskets 11 in the horizontal joints 3 are provided so that their ends abut against the vertical gaskets 10 in the vertical joints 2. A fire-resistant and non-combustible material 12 is filled between each gasket 10, 11 and the sealing material 8.
[0037] A horizontal gasket 11 is continuously provided in the horizontal direction in the gap 16 between the base material 6 and the extruded cement board 1. This further enhances the effect of reducing air leakage from the joint and reliably prevents water intrusion.
[0038] The vertical gasket 10 is made of closed-cell ethylene propylene rubber, and the horizontal gasket 11 is made of water-swellable polyurethane foam. In this embodiment, butyl tape for adhesion is provided on the mounting surface of the vertical gasket 10. A PET film is attached to the leading edge surface of the horizontal gasket 11 that is pushed into the horizontal joint 3 as a low-friction film to reduce friction. The PET film acts as a lubricant when inserted into the horizontal joint 3, making insertion easier and facilitating position adjustment after insertion.
[0039] The vertical gasket 10 and the horizontal gasket 11 have physical properties with a density of 120 - 160 kg / m 3 and a compressive stress of 20 - 36 KPa when compressed by 25 - 30%. The vertical gasket 10 is sandwiched in the vertical joint portion 2 with a compression ratio of 25 - 30% with respect to the joint width. The horizontal gasket 11 is sandwiched in the horizontal joint portion 3 with a compression ratio of 25 - 30% with respect to the joint width.
[0040] The dimensions are set during gasket molding so that the sandwiched vertical and horizontal gaskets 10 and 11 have the above compression ratio. Also in this embodiment, the difference in compressive stress between the vertical gasket 10 sandwiched in the vertical joint portion 2 and the horizontal gasket 11 sandwiched in the horizontal joint portion 3 is set to 10 KPa or less. The vertical joint portion 2 and the horizontal joint portion 3 are sealed with substantially equal pressure, and the internal wall pressure and the external atmospheric pressure can be made closer to equal pressure. Therefore, the flow of air within the joint structure stops, leakage from the joint portion does not occur, airtightness is maintained, and water intrusion can be prevented. Since the vertical gasket 10 and the horizontal gasket 11 are made of different materials from each other, the watertight performance can be significantly improved.
Example
[0041] Based on JIS 1414 "Watertight Performance", the performance of the structure using the gasket of the density of the present invention as an example and the gasket of the conventional density as a comparative example was confirmed. In both the example and the comparative example, as shown in FIGS. 8(a) horizontal stretch and (b) vertical stretch, a base was assembled on a frame 100 with a width of 1980 mm and a height of 1980 mm (inner width of 1780 mm and height of 1780 mm), and a plurality of extruded cement boards 101 were attached. The structure was configured such that the width of the horizontal joint portion of the horizontal stretch was 10 mm, the width of the vertical joint portion was 15 mm, the width of the horizontal joint portion of the vertical stretch was 15 mm, and the width of the vertical joint portion was 10 mm.
[0042] As the structure of Example 1, an extruded cement board was horizontally stretched. With a density of 150 kg / m 3A horizontal gasket made of closed-cell ethylene propylene rubber with a compressive stress of 34 kPa at 25% compression was fabricated to a height of 13.5 mm and a width of 13 mm. This horizontal gasket was pre-attached to the shoulder of the protrusion corresponding to the horizontal joint of the lower extruded cement board. The upper extruded cement board was fitted, and the horizontal gasket was adjusted to a thickness of 10 mm when compressed, and the upper extruded cement board was attached. Density: 150 kg / m³ 3 Vertical gaskets made of water-expandable polyurethane foam with a compressive stress of 24.5 kPa at 25% compression were fabricated to a height of 15 mm and a width of 20 mm. After all the extruded cement boards were installed, the vertical gaskets were installed in the vertical joints so that their width was compressed to 15 mm. The compressive stress of the gaskets at this time was 34 kPa in the horizontal joints and 24.5 kPa in the vertical joints.
[0043] In Example 2, extruded cement boards were installed vertically. Density: 150 kg / m³ 3 A vertical gasket made of closed-cell ethylene propylene rubber with a compressive stress of 34 kPa at 25% compression was processed to a height of 13.5 mm and a width of 13 mm. This vertical gasket was pre-attached to the shoulder of the protrusion corresponding to the vertical joint of one extruded cement board. The other extruded cement board was fitted, and the vertical gasket was compressed to a thickness of 10 mm, and then the other extruded cement board was attached. Density: 150 kg / m³ 3 A horizontal gasket made of water-expandable polyurethane foam with a compressive stress of 24.5 kPa at 25% compression was fabricated to a height of 15 mm and a width of 20 mm. After all the extruded cement boards were installed, the horizontal gasket was installed in the horizontal joints so that its width was compressed to 15 mm. The compressive stress of the gasket at this time was 34 kPa in the vertical joints and 24.5 kPa in the horizontal joints.
[0044] Comparative Example 1 used extruded cement boards laid horizontally. Density: 130 kg / m³ 3A urethane horizontal gasket with a compressive stress of 10 kPa at 30% compression was fabricated to a height of 14.3 mm and a width of 13 mm. This horizontal gasket was pre-attached to the shoulder of the protrusion corresponding to the horizontal joint of the lower extruded cement board. The upper extruded cement board was fitted, and the horizontal gasket was adjusted to a thickness of 10 mm when compressed, and the upper extruded cement board was attached. Density: 150 kg / m³ 3 A vertical gasket made of urethane with a compressive stress of 10 kPa at 30% compression was fabricated to a height of 15 mm and a width of 21.5 mm. After all the extruded cement boards were installed, the vertical gasket was installed in the vertical joints so that its width was compressed to 15 mm. The compressive stress of the gasket at this time was approximately 10 kPa in both the horizontal and vertical joints.
[0045] Comparative Example 2 used a structure in which extruded cement boards were installed vertically. Density: 130 kg / m³ 3 A vertical urethane gasket with a compressive stress of 10 kPa at 30% compression was fabricated to a height of 14.3 mm and a width of 13 mm. This vertical gasket was pre-attached to the shoulder of the protrusion corresponding to the vertical joint of one of the extruded cement boards. The other extruded cement board was fitted, adjusted so that the vertical gasket was compressed to a thickness of 10 mm, and then the other extruded cement board was attached. Density: 150 kg / m³ 3 A urethane horizontal gasket with a compressive stress of 10 kPa at 30% compression was fabricated to a height of 15 mm and a width of 21.5 mm. After all the extruded cement boards were installed, the horizontal gasket was installed in the horizontal joints so that its width was compressed to 15 mm. The compressive stress of the gasket at this time was approximately 10 kPa in both the horizontal and vertical joints.
[0046] Comparative Example 3 used extruded cement boards laid horizontally. Density: 130 kg / m³ 3A vertical urethane gasket with a compressive stress of 10 kPa at 30% compression was fabricated to a height of 14.3 mm and a width of 13 mm. This vertical gasket was pre-attached to the shoulder of the protrusion corresponding to the vertical joint of one extruded cement board. The other extruded cement board was fitted, and the vertical gasket was adjusted to a thickness of 10 mm when compressed, and then the other adjacent extruded cement board was attached. Density: 150 kg / m³ 3 A urethane horizontal gasket with a compressive stress of 34 kPa at 25% compression was fabricated to a height of 15 mm and a width of 20 mm. After all the extruded cement boards were installed, the horizontal gasket was installed in the horizontal joints so that its width was compressed to 15 mm. The compressive stress of the gasket at this time was 10 kPa in the horizontal joints and 24.5 kPa in the vertical joints.
[0047] In each example and comparative example, the surface side was filled with sealant after inserting a conventional backing material. In each example and comparative example, two plates with a width of 25 mm, a length of 50 mm, and a thickness of 1 mm, each with a 0.25 mm protrusion on its surface, were used as a defect plate with a 0.5 mm gap between the protrusions. This defect plate was inserted at three locations each in the vertical and horizontal joints, at the positions marked with a triangle (see Figures 8(a) and (b)), so that it was at least 5% of the length of the sealant applied on the surface side. The defect rate in the joints at this time was 8.4%.
[0048] The test specimens for each example and each comparative example were attached to the dynamic air pressure device, and 4 liters / mm·m of air was applied to the test specimens. 2 Pressure was applied while spraying water. As a result, the watertight performance of the vertical and horizontal joints was 5000 Pa in Comparative Example 1 and Comparative Example 2. Slight water seepage occurred in the vertical joints in Comparative Example 1, in the horizontal joints in Comparative Example 2, and in a part of the horizontal joints in Comparative Example 3. In Example 1 and Example 2, the watertight performance of both the vertical and horizontal joints was 5000 Pa, and no water seepage occurred.
[0049] The present invention is not limited to the embodiments and examples described above. The joint width and gap width can be appropriately changed depending on the shape of the building panel, the layout of the building panel, the type of substrate, etc., and are not limited to these widths. The building panel is not limited to extruded cement board, and other building panels such as ALC can also be used. The joint structure of the building panel according to the present invention can be modified within the technical scope described in the claims. The various members used in the joint structure of the building panel may be of any form as long as they do not impair the effects of the present invention. [Explanation of Symbols]
[0050] 1. Extruded cement board 1a Back side base material 2. Vertical joint section 3. Horizontal joint section 6. Substrate 7 Z Clip 8. Sealant 9. Backup material 10 Vertical gasket 11. Side gasket 12 Fireproof and noncombustible materials 13 PET film 14 Butyl Tape 16 Cavity t1 Width of vertical joint t2 Width of horizontal joint Joint structure for K1 and K2 building panels
Claims
1. A joint structure for building panels, comprising vertical and horizontal waterproof gaskets sandwiched in the vertical and horizontal joints on the back side of building panels that are laid vertically and horizontally, The front longitudinal and transverse gaskets have a density of 120-160 kg / m³. ３ It has physical properties such that the compressive stress at 25-30% compression is 20-36 kPa, and is sandwiched between the vertical and horizontal joints, respectively, when the compression ratio is set to 25-30%. A joint structure for building panels, characterized in that the difference in compressive stress between the vertical gasket and the horizontal gasket when they are sandwiched together is 10 kPa or less.
2. The joint structure for a building panel according to claim 1, characterized in that the vertical gasket and the horizontal gasket are made of different materials.
3. The aforementioned vertical gasket is made of closed-cell ethylene propylene rubber or water-swellable polyurethane foam. The joint structure for a building panel according to claim 2, characterized in that the transverse gasket is made of closed-cell ethylene propylene rubber or water-swellable polyurethane foam.
4. The joint structure for a building panel according to claim 1, characterized in that a low-friction film for reducing friction is provided on the leading edge surface of the vertical and horizontal gaskets that is inserted into the vertical and horizontal joint portions.
5. The joint structure for a building panel according to claim 1, characterized in that the vertical gasket or the horizontal gasket is sandwiched in the gap between the building panel and the base material for attaching the building panel.