Gasket for joints of architectural panels and waterproof structure for joints

Abstract

To provide a gasket for a joint part with an improved waterproof performance at the joint part of a building panel by assembling a plurality of gaskets.SOLUTION: A gasket for a joint part is used for a waterproof structure of a joint part of a building panel and has a predetermined length extending along the joint part and is assembled with a plurality of layers laminated alternately by isolated cell gaskets and open cell gaskets.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present application relates to a gasket for use in a joint portion of a building panel and a waterproof structure for the joint portion using the gasket. [Background technology]

[0002] Conventionally, the joints of building panels used in exterior wall materials have been waterproofed by inserting a backup material from the outside (also called the "outside") and then filling them with a sealant to maintain waterproof performance. In addition, in such waterproofing structures, waterproofing materials such as gaskets are inserted (sometimes sandwiched) into the joints on the inside (also called the "inside") of the building panels to further improve the waterproof performance of the joints.

[0003] Conventional waterproof joint structures include the longitudinal cross-sectional view of a first example of a conventional joint waterproof structure shown in Figure 10 and the cross-sectional view of the joint waterproof structure shown in Figure 11. The structure shown in Figures 10 and 11 is an example of a "horizontal installation" in which extruded cement boards serving as building panels are installed with their longitudinal axes oriented horizontally. The horizontally installed extruded cement boards 100 and 101 are attached to a horizontally extending L-shaped base material 121 attached to a building frame 120 with Z-clips 130. The horizontal and vertical joints 110 and 111 of adjacent extruded cement boards 100 and 101 are sealed on the exterior side with a sealant 114, while the interior side is sealed with weather-resistant gaskets 116 and 117, such as EPDM. The gaskets 116 and 117 are described below.

[0004] Also, there are structures such as the longitudinal cross-section of a second example of a conventional joint waterproofing structure shown in Figure 12 and the cross-section of the joint waterproofing structure shown in Figure 12 shown in Figure 13. The structures shown in Figures 12 and 13 are examples of "vertical installation" in which extruded cement boards serving as building panels are installed with their longitudinal direction vertically. Vertically installed extruded cement boards 100, 101 are attached to a horizontally extending L-shaped base material 121 attached to a building frame 120 with Z-clips 130. A flashing material 112 is sandwiched between adjacent extruded cement boards 100, 101 (Figure 12), and a backup material 113 is attached to the outer surface of the hanging piece of the flashing material 112. The horizontal joints 110 and vertical joints 111 of the vertically installed extruded cement boards 100, 101 are sealed on the exterior side with sealant 114 and on the interior side with gaskets 118. Typically, the body 120 is provided with a fire-resistant coating 122 .

[0005] Conventional gaskets used in such waterproof structures include those shown in Figs. 14(a), 14(b), and 14(c), which are perspective views of conventional joint gaskets. Fig. 14(a) is a perspective view of a gasket 116 for a horizontally installed vertical joint, Fig. 14(b) is a perspective view of a gasket 117 for a horizontally installed horizontal joint, and Fig. 14(c) is a perspective view of a gasket 118 for a vertically installed vertical joint. The gaskets 116 and 117 have different cross-sectional aspect ratios. In the conventional waterproof structures shown in Figs. 10 to 13, gaskets 116 to 118 for vertical and horizontal joints, respectively, are inserted into the horizontal and vertical joints 110 and 111 on the interior side. The gaskets 116 to 118 installed vary depending on the joints 110 and 111, but single-material gaskets or multi-material laminated gaskets are used depending on the required watertightness.

[0006] In the waterproof structure of the joints 110, 111 using conventional gaskets, either the architectural panel (extruded cement board 100, 101) is installed and then the gasket is inserted into the joints 110, 111, or the architectural panel is installed with the gasket attached in advance.

[0007] Prior art sealing materials used in this type of waterproof structure include, for example, a sealing material formed by bending and deforming a plate-shaped body made of foam at the center of its width, making both end faces in the width direction flush, and further forming a hollow portion inside the bend and fixing the flush side (see, for example, Patent Document 1).

[0008] Another prior art technology is a dry sealing material that is placed in the gap formed between adjacent panels to seal the gap, and is an inter-panel sealing material that is composed of a hydrophobic urethane foam material and a water-absorbing and swelling foam resin material (see, for example, Patent Document 2).

[0009] Another prior art is a joint gasket whose cross-sectional shape is formed to have a roughly V-shaped bend, and which is configured so that when this bend is inserted into the joint, the end away from the bend comes close to and deforms (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Publication No. 11-062036 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-231485 [Patent Document 3] Japanese Patent Application Publication No. 2018-031250 Summary of the Invention [Problem to be solved by the invention]

[0011] However, when inserting gaskets into the joints after installing the architectural panels (extruded cement boards 100, 101), if a high-density gasket is used to maintain watertightness, it is difficult to compress and therefore difficult to insert into the joints, while if a low-density gasket is used, it is easy to compress and therefore easy to insert into the joints, but high watertightness performance may not be expected.

[0012] Furthermore, when pre-attaching gaskets to architectural panels, high-density gaskets are difficult to compress, making it difficult to adjust the spacing between joints and requiring time for installation.On the other hand, low-density gaskets are easy to compress and make it easy to adjust the spacing between joints, but they may not provide high-performance watertightness.

[0013] Thus, while conventional urethane gaskets made from open-cell or semi-open-cell foam used as gaskets for joints are inexpensive, they have the drawback of leaking air or water when subjected to high pressure. Increasing the compressive stress to improve watertightness increases the resilience of the gasket, resulting in poor workability (high-resilience urethane gaskets make it difficult to adjust the spacing dimensions of joints between extruded cement boards) and increased material costs.

[0014] In addition, although the structure of Patent Document 1 can ensure the minimum compression required for sealing by bending, since it is a foam, the compressive stress is low, making it difficult to use in joints where high watertightness is required.

[0015] Furthermore, the structure of Patent Document 2 uses a combination of a water-swellable gasket and a hydrophobic gasket, which increases the cost compared to a single gasket.

[0016] Furthermore, although the structure of Patent Document 3 makes it easy to insert the gasket and to install, the adhesion force to the building panel at the joint is solely due to the repulsive force of the gasket, so it may be difficult to apply when better watertightness at the joint is required.

[0017] Therefore, the present application aims to provide a joint gasket that improves the waterproofing performance of the joints of building panels by combining multiple gaskets, and a joint waterproof structure using the same. [Means for solving the problem]

[0018] In order to achieve the above-mentioned object, the gasket for joints of architectural panels according to the present application is a gasket for joints used in the waterproof structure of the joints of architectural panels, which has a predetermined length extending along the joints and is combined with multiple layers of alternating closed-cell gaskets and open-cell gaskets.

[0019] With this configuration, the joint gasket is made up of multiple layers of two types of gaskets, closed-cell gaskets and open-cell gaskets, alternately combined, so when inserted into the joint, the open-cell gasket compresses and deforms, making it easier to insert and improving workability.After insertion into the joint, the closed-cell gasket adheres to the building panel, and the repulsive force of the open-cell gasket further improves adhesion, thereby improving watertightness.In other words, the repulsive force of the two types of materials makes the joint gasket easier to insert into the joint or easier to compress in the joint, improving workability and watertightness.

[0020] A film may be attached to the surface of the open-cell gasket. With this configuration, by folding the open-cell gasket with the film attached inward, the joint gasket can be easily inserted into the joint using an insertion jig, and the jig can also be easily removed.

[0021] Furthermore, a folding portion extending in the longitudinal direction may be provided in the widthwise center of the surface to which the film is attached. In this specification and claims, the term "folding portion" includes crease lines, slits, grooves, etc. With this configuration, the joint gasket can be easily folded in the widthwise center along the folding portion extending in the longitudinal direction of the film side.

[0022] On the other hand, the waterproof joint structure of the architectural panel according to the present application is a joint waterproof structure in which a sealant is filled in the joints on the outer surface of the architectural panel and a joint gasket is provided in the joints on the inner surface of the architectural panel. The joint gasket is a combination of multiple layers of alternating closed-cell gaskets and open-cell gaskets, and is provided in the joints on the inner surface by folding it longitudinally at the center of the width direction. In this specification and claims, "joint" includes the space between the architectural panels and the gap between the architectural panel and the base material. Furthermore, "joint gasket" includes those provided by either "insertion" or "sandwiching" methods.

[0023] With this configuration, in a waterproof joint structure in which a sealant is filled in the joints on the front side of the architectural panel and a joint gasket is provided in the joints on the back side of the architectural panel, the joint gasket is made up of multiple layers in which two types of gaskets, closed-cell gaskets and open-cell gaskets, are alternately combined.As a result, when the open-cell gasket is inserted into the joint, it is compressed and deformed, making it easier to insert and improving workability.After insertion into the joint, the closed-cell gasket adheres to the architectural panel, and the improved adhesion due to the repulsive force of the open-cell gasket further improves watertightness.

[0024] The joint gasket may be bent so that the closed-cell gasket is in contact with the building panel. With this configuration, the repulsive force of the open-cell gasket provided in the joint brings the closed-cell gasket into close contact with the building panel, thereby improving watertightness.

[0025] The joint gasket may have a film attached to the surface of the open-cell gasket and be folded so that the film faces inward when installed in the joint. With this configuration, the joint gasket can be easily inserted into the joint by folding it with an insertion jig so that the film faces inward, and the insertion jig can be easily removed, making installation of the joint gasket easier.

[0026] The joint gasket may also have a bent portion extending in the longitudinal direction at the widthwise center of the surface to which the film is attached. With this configuration, the joint gasket can be inserted into the joint efficiently by bending it along the bent portion, thereby improving the ease of installation of the joint gasket. [Effects of the Invention]

[0027] According to the present application, by combining two types of gaskets, an open-cell gasket and a closed-cell gasket, to form a gasket for joints, it is possible to improve the waterproof performance of the joints of building panels. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a perspective view showing a first joint gasket according to a first embodiment of the present application. [Figure 2] FIG. 2 is a perspective view showing a second joint gasket according to a second embodiment of the present application. [Figure 3] FIG. 3 is a diagram showing a gasket for a third joint portion according to a third embodiment of the present application, where (a) is a perspective view and (b) is a partial cross-sectional view of the upper surface portion. [Figure 4] FIG. 4 is a side view showing a state in which the third joint gasket shown in FIG. 3 is inserted into the joint. [Figure 5] FIG. 5 is a vertical cross-sectional view showing the first joint waterproof structure according to the first embodiment of the present application. [Figure 6]FIG. 6 is a cross-sectional view of the first joint waterproof structure shown in FIG. [Figure 7] FIG. 7 is a vertical cross-sectional view showing a second joint waterproof structure according to a second embodiment of the present application. [Figure 8] FIG. 8 is a cross-sectional view of the second joint waterproof structure shown in FIG. [Figure 9] FIG. 9 is a diagram showing the arrangement of extruded cement boards in the first joint waterproof structure on which the watertightness test was conducted. [Figure 10] FIG. 10 is a vertical cross-sectional view showing a first example of a conventional joint waterproof structure. [Figure 11] FIG. 11 is a cross-sectional view of the joint waterproof structure shown in FIG. [Figure 12] FIG. 12 is a vertical cross-sectional view showing a second example of a conventional joint waterproof structure. [Figure 13] FIG. 13 is a cross-sectional view of the joint waterproof structure shown in FIG. [Figure 14] 14(a), (b), and (c) are perspective views showing a conventional gasket for a joint portion. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, an embodiment of the present application will be described with reference to the drawings. In the following embodiment, an example will be described in which extruded cement boards 100, 101 (FIGS. 6 and 7) are used as building panels.

[0030] (Gasket for joint portion according to the first embodiment) 1 is a perspective view showing a first joint gasket 10 according to the first embodiment. The first joint gasket 10 is shown in a state cut to a predetermined length.

[0031] The first joint gasket 10 is a two-layer gasket consisting of a laminated closed-cell gasket 11 and an open-cell gasket 12. The closed-cell gasket 11 and the open-cell gasket 12 are bonded together using an adhesive or the like. The closed-cell gasket 11 is harder than the open-cell gasket 12. The closed-cell gasket 11 contacts the extruded cement boards 100, 101 at the joint 110, and the repulsive force of the open-cell gasket 12 improves adhesion. The open-cell gasket 12 serves as a cushioning material that is compressed when the first joint gasket 10 is folded at the center widthwise and inserted into the joint 110, facilitating insertion. The open-cell gasket 12 also serves as a retaining material that holds the first joint gasket 10 in place inside the joint 110 after insertion.

[0032] The thickness T of the first joint gasket 10 is preferably a thickness that allows it to be compressed 30 to 70%, and more preferably 40 to 60%, in the folded state relative to the gap spacing V of the joint 110 (FIG. 4). This is related to the thickness ratio of the closed-cell gasket 11 and the open-cell gasket 12, which will be described later, and the compressive load of each gasket. If the compression is less than 30%, the gasket will not be held in place in the joint 110 sufficiently, while if the compression is more than 70%, it will be difficult to insert the gasket into the joint 110, resulting in poor workability.

[0033] Materials that can be used for the closed-cell gasket 11 and the open-cell gasket 12 include polyurethane, EPDM (ethylene-propylene-diene rubber), CR prene rubber, PVC (polyvinyl chloride), EP (ethylene-propylene rubber), and Si (silicon rubber). The closed-cell gasket 11 and the open-cell gasket 12 can be configured such that the thickness t2 of the open-cell gasket 12 is greater than the thickness t1 of the closed-cell gasket 11.

[0034] The ratio of the thickness t2 of the open-cell gasket 12 to the thickness t1 of the closed-cell gasket 11 is preferably 3 (open-cell gasket):1 (closed-cell gasket) to 1 (open-cell gasket):1 (closed-cell gasket). If the ratio of the closed-cell gasket 11 to the open-cell gasket 12 is greater than 1:1, meaning the proportion of closed-cell gasket 11 increases, compression becomes difficult and workability deteriorates. If the ratio of the closed-cell gasket 11 to the open-cell gasket 12 is less than 3:1, meaning the proportion of open-cell gasket 12 increases, the balance between the holding power for sealing the closed-cell gasket 11 in the joint 110 and the watertightness performance is poor, and the desired watertightness may not be achieved.

[0035] The compression load of the closed-cell gasket 11 is 0.02 to 0.15 N / mm at 25% compression. 2 It is desirable that the compression load is in the range of 0.02N / mm 2 If it is smaller than this, the joint 110 may not be held sufficiently and the desired watertightness may not be achieved. 2 If it is larger, it will be difficult to insert it into the joint 110, which will result in poor workability.

[0036] The compression load of the open-cell gasket 12 is 0.0015 to 0.15 N / mm at 25% compression. 2 It is preferable that the compression load is in the range of 0.0015 N / mm 2 If it is smaller than this, the joint 110 may not be held sufficiently and the desired watertightness may not be achieved. 2 If it is larger, it will be difficult to insert it into the joint 110, which will result in poor workability.

[0037] This first joint gasket 10 is used by folding it with the open-cell gasket 12 facing inward so that the closed-cell gasket 11 abuts against the extruded cement boards 100, 101 (as in Figure 4). As a result, the soft open-cell gasket 12 is folded inside the hard closed-cell gasket 11 abutting against the extruded cement boards 100, 101, and the extrusion force of the open-cell gasket 12 can keep the closed-cell gasket 11 in close contact with the extruded cement boards 100, 101. Furthermore, when the first joint gasket 10 is folded and inserted into the joint 110, the soft open-cell gasket 12 on the inside is crushed, making it easier to insert.

[0038] That is, the closed-cell gasket 11 utilizes the repulsive force of the open-cell gasket 12, which tends to return to its original shape when bent, to be tightly attached to the extruded cement boards 100, 101 within the joint 110. Furthermore, because the outer closed-cell gasket 11 is closed-cell, water does not penetrate inside even when it gets wet, ensuring waterproofing.

[0039] In this way, with the first joint gasket 10, the open-cell gasket 12 can be crushed and inserted from the surface side of the joint 110 of the extruded cement boards 100, 101 so that the closed-cell gasket 11 comes into contact with the extruded cement boards 100, 101, thereby improving the watertightness of the joint 110.

[0040] (Gasket for joint portion according to second embodiment) 2 is a perspective view showing a second joint gasket 20 according to the second embodiment. The second joint gasket 20 is also shown cut to a predetermined length. The second joint gasket 20 will be described with reference to components different from the first joint gasket 10. Components identical to those in the first joint gasket 10 will be designated by the same reference numerals, and descriptions thereof will be omitted.

[0041] The second joint gasket 20 is made up of two layers, a closed-cell gasket 21 and an open-cell gasket 22, laminated together, with a film 23 attached to the surface of the open-cell gasket 22. The second joint gasket 20 has the same configuration as the first joint gasket 10 except for the film 23, so further explanation will be omitted.

[0042] Films such as polyethylene, polypropylene, and acrylic can be used as the film 23. The film 23 may be made of any material that allows the second joint gasket 20 to be easily pushed in and pulled out by the folding plate 41 (FIG. 4) of the insertion jig 40 when inserting the second joint gasket 20 into the joint 110, as shown in FIG. 4 described later.

[0043] Like the first joint gasket 10, the thickness T of the second joint gasket 20 is preferably a thickness that allows 30 to 70% compression, and more preferably 40 to 60% compression, of the gap distance V (FIG. 4) between the joints 110, 111 when folded. The reason for this is the same as for the first joint gasket 10. The ratio of the open-cell gasket 22 to the closed-cell gasket 21 in the thickness direction is preferably 3:1 to 1:1. The reason for this is the same as for the first joint gasket 10. The compressive loads of the closed-cell gasket 21 and the open-cell gasket 22 are also the same as for the first joint gasket. The reason for this is the same as for the first joint gasket 10.

[0044] This second joint gasket 20 is also used by folding the open-cell gasket 22 on the inside so that the closed-cell gasket 21 abuts against the extruded cement boards 100, 101 (FIG. 4). This allows the soft open-cell gasket 22 to be folded inside the hard closed-cell gasket 21 abutting against the extruded cement boards 100, 101, so the extrusion force of the open-cell gasket 22 can keep the closed-cell gasket 21 in close contact with the extruded cement boards 100, 101. Furthermore, when the second joint gasket 20 is folded and inserted into the joint 110, the soft open-cell gasket 22 on the inside is crushed, facilitating insertion. Furthermore, with the second joint gasket 20, the film 23 attached to the surface of the open-cell gasket 22 reduces frictional resistance with the folding plate 41 (FIG. 4) of the insertion jig 40, making it easy to insert and remove.

[0045] That is, the closed-cell gasket 21 utilizes the repulsive force of the open-cell gasket 22, which tends to return to its original shape when bent, to be tightly attached to the extruded cement boards 100, 101 within the joint 110. Furthermore, because the outer closed-cell gasket 21 is made of closed cells, water does not penetrate to the interior even when it gets wet, ensuring waterproofing.

[0046] In this way, with the second joint gasket 20, the open-cell gasket 22 can be crushed and inserted from the surface side of the joint 110 of the extruded cement boards 100, 101 so that the closed-cell gasket 21 comes into contact with the extruded cement boards 100, 101, thereby improving the watertightness of the joint 110.

[0047] (Gasket for joint portion according to the third embodiment) FIG. 3 is a drawing showing a third joint gasket according to a third embodiment, where (a) is a perspective view and (b) is a partial cross-sectional view of the top surface. FIG. 4 is a side view of the third joint gasket 30 shown in FIG. 3 when being folded. The third joint gasket 30 is also shown cut to a predetermined length. The third joint gasket 30 will be described with respect to configurations that differ from the second joint gasket 20. The same components as those in the second joint gasket 20 are designated by the same reference numerals, and their description will be omitted.

[0048] The third joint gasket 30 is made up of two layers, a closed-cell gasket 31 and an open-cell gasket 32, laminated together, with a film 33 attached to the surface of the open-cell gasket 32, and a folded portion 34 extending longitudinally is provided in the center of the film 33 in the width direction W (FIG. 3(b)). The third joint gasket 30 has the same configuration as the second joint gasket 20 except for the folded portion 34, so further description will be omitted.

[0049] The folding portions 34 provided on the third joint gasket 30 include those in which crease lines are provided in the film 33, and those in which recesses such as slits or grooves are provided in the film 33. Providing such folding portions 34 serves as a guide for the folding position when folding the third joint gasket 30 at the center in the width direction to insert it into the joint 110, making it easier to fold the entire third joint gasket 30 evenly.

[0050] 4, when the third joint gasket 30 is inserted into the joint 110 and the central portion in the width direction is folded with the folding plate 41 of the insertion jig 40, the leading end of the folding plate 41 of the insertion jig 40 can be placed along the folding portion 34 of the film 33 to easily fold it. Therefore, the third joint gasket 30 can be inserted into the joint 110 more efficiently than the first joint gasket 10 and the second joint gasket 20.

[0051] Moreover, with the third joint gasket 30 (similar to the second joint gasket 20), the folding operation can be easily performed by pushing in and pulling out the folding plate 41 of the insertion jig 40 using the film 33. Therefore, with the third joint gasket 30 (similar to the second joint gasket 20), the insertion operation into the joint 110 can be performed more efficiently than with the first joint gasket 10.

[0052] Like the first joint gasket 10, the thickness T of the third joint gasket 30 is preferably a thickness that allows 30 to 70% compression, and more preferably 40 to 60% compression, of the gap distance V (FIG. 4) between the joints 110, 111 when folded. The reason for this is the same as for the first joint gasket 10. The ratio of the open-cell gasket 32 ​​to the closed-cell gasket 31 in the thickness direction is preferably 3:1 to 1:1. The reason for this is the same as for the first joint gasket 10. The compressive loads of the closed-cell gasket 31 and the open-cell gasket 32 ​​are also the same as for the first joint gasket 10. The reason for this is the same as for the first joint gasket 10.

[0053] This third joint gasket 30 is also used by folding the open-cell gasket 32 ​​on the inside so that the closed-cell gasket 31 abuts against the extruded cement boards 100, 101 (FIG. 4). This allows the soft open-cell gasket 32 ​​to be folded inside the hard closed-cell gasket 31 that contacts the extruded cement boards 100, 101, so the extrusion force of the open-cell gasket 32 ​​can keep the closed-cell gasket 31 in close contact with the extruded cement boards 100, 101. Furthermore, when the third joint gasket 30 is folded and inserted into the joint 110, the soft open-cell gasket 32 ​​on the inside is crushed, facilitating insertion. Furthermore, with the third joint gasket 30, the film 33 attached to the surface of the open-cell gasket 32 ​​reduces frictional resistance with the folding plate 41 (FIG. 4) of the insertion jig 40, making it easy to insert and remove.

[0054] That is, the closed-cell gasket 31 utilizes the repulsive force of the open-cell gasket 32, which tends to return to its original shape when bent, to be tightly attached to the extruded cement boards 100, 101 within the joint 110. Furthermore, because the outer closed-cell gasket 31 is made of closed cells, water does not penetrate to the interior even when it gets wet, ensuring waterproofing.

[0055] Furthermore, the third joint gasket 30 has a bent portion 34 pre-formed in the center in the width direction, which serves as a guide for the bending position when bending the third joint gasket 30, and allows the third joint gasket 30 to be bent evenly in the longitudinal direction using the bending plate 41 of the insertion jig 40, and then inserted into the joint 110 for proper installation. Therefore, the third joint gasket 30 can be inserted into the joint 110 more efficiently than the second joint gasket. The improved efficiency of the insertion work allows for shorter work time and reduced labor.

[0056] In this way, with the third joint gasket 30, the open-cell gasket 32 ​​can be crushed and inserted onto the back side of the joint 110 of the extruded cement boards 100, 101 so that the closed-cell gasket 31 comes into contact with the extruded cement board 100, thereby improving the watertightness of the joint 110.

[0057] The first joint gasket 10, the second joint gasket 20, and the third joint gasket 30 are all two-layer examples, each including one closed-cell gasket 11, 21, 31 and one open-cell gasket 12, 22, 32. The present application is applicable as long as the closed-cell gaskets 11, 21, 31 and the open-cell gaskets 12, 22, 32 are alternately stacked in multiple layers. In other words, the closed-cell gaskets 11, 21, 31 and the open-cell gaskets 12, 22, 32 are not limited to being stacked in two layers, and may be stacked in more than two layers. For example, if closed-cell gaskets 11, 21, 31, open-cell gaskets 12, 22, 32, and closed-cell gaskets 11, 21, 31 are stacked together to form a three-layer structure, the open-cell gaskets 12, 22, 32 sandwiched between the closed-cell gaskets 11, 21, 31 will be compressed more evenly when folded, thereby further improving watertightness.

[0058] When laminating multiple layers of closed-cell gaskets 11, 21, 31 and open-cell gaskets 12, 22, 32, the closed-cell gaskets 11, 21, 31 must be the ones that come into contact with the extruded cement boards 100, 101. Furthermore, when laminating closed-cell gaskets 11, 21, 31 and open-cell gaskets 12, 22, 32, it is preferable that the thickness ratio of the open-cell gaskets 12, 22, 32 to the closed-cell gaskets 11, 21, 31 be as described above.

[0059] The above-described embodiment is merely an example, and various modifications are possible within the scope of the present application without departing from the spirit of the present application, and the present application is not limited to the above-described embodiment.

[0060] (Waterproof structure for joints according to the first embodiment) FIG. 5 is a longitudinal cross-sectional view showing a first joint waterproof structure 1 according to the first embodiment. FIG. 6 is a transverse cross-sectional view of the first joint waterproof structure 1 shown in FIG. 5. The first joint waterproof structure 1 is an example of a waterproof structure for a structure in which extruded cement boards 100, 101 are installed horizontally. The concepts of up, down, left, and right in these figures refer to the direction in which the hollow portion 102 of the horizontally installed extruded cement boards 100, 101 extends as the left-right direction, and the direction perpendicular to the hollow portion 102 as the up-down direction, as shown in FIG. 6. The outer surface of the extruded cement boards 100, 101 is also referred to as the "outdoor side," and the inner surface is also referred to as the "indoor side." This embodiment will be described using a third joint gasket 30, but the same applies when using the first joint gasket 10 or the second joint gasket 20.

[0061] As shown in Figure 5, the upper and lower extruded cement boards 100, 101 that are laid horizontally are attached with Z-clips 130 to a horizontally continuous L-shaped base material 121 attached to a body 120. The Z-clips 130 are fixed with fixing bolts 132 to square nuts 131 inserted into hollow portions 102 of the extruded cement boards 100, 101. The horizontally laid extruded cement boards 100, 101 are attached with the hollow portions 102 extending in the left-right direction.

[0062] The horizontal joints 110 on the exterior surfaces of the extruded cement boards 100, 101 that are laid horizontally and adjacent to each other in the vertical direction are sealed on the outdoor side with a sealant 114. The horizontal joints 110 on the interior surfaces of the extruded cement boards 100, 101 are fitted with horizontally extending joint gaskets 116 made of EPDM or other materials with excellent weather resistance.

[0063] 6, the vertical joint 111 extending vertically between the horizontally adjacent extruded cement boards 100, 101 is sealed on the outdoor side with sealant 114 and rock wool 115, and a third joint gasket 30 is inserted on the indoor side. The third joint gasket 30 is inserted by folding the width direction W (short side direction) equally at the center.

[0064] Thus, according to the first joint waterproofing structure 1, the third joint gasket 30 is inserted into the vertical joint 111, which extends vertically across the horizontally laid extruded cement boards 100, 101. The inserted third joint gasket 30 is folded and compressed with the open-cell gasket 32 ​​facing inward, and inserted from the outside of the room so that the closed-cell gasket 31 contacts the extruded cement boards 100, 101. The open-cell gasket 32 ​​is easily compressed, allowing it to be inserted efficiently in a folded state. After the third joint gasket 30 is inserted into the vertical joint 111, the outside of the room is sealed with rock wool 115 and sealant 114.

[0065] The third joint gasket 30 inserted into the joint 110 presses the closed-cell gasket 31 against the extruded cement boards 100, 101 with the repulsive force of the inwardly bent open-cell gasket 32 ​​as it tries to return to its original shape, and this state can be maintained. This makes it possible to improve the waterproof performance of the joint 110.

[0066] (Waterproof structure for joints according to the second embodiment) FIG. 7 is a longitudinal cross-sectional view showing a second joint waterproof structure 2 according to a second embodiment. FIG. 8 is a transverse cross-sectional view of the second joint waterproof structure 2 shown in FIG. 7. The second joint waterproof structure 2 is an example of a waterproof structure for a structure in which extruded cement boards 100, 101 are installed vertically. Regarding the concepts of up, down, left, and right in these figures, the vertical direction refers to the direction in which the hollow portion 102 of the vertically installed extruded cement boards 100, 101 extends, and the left and right direction refers to the direction perpendicular to the hollow portion 102, as shown in FIG. 8. The outdoor side of the extruded cement boards 100, 101 is referred to as the outside, and the indoor side is referred to as the inside. In this embodiment, the third joint gasket 30 will be used for explanation, but the same applies when the first joint gasket 10 or the second joint gasket 20 is used.

[0067] As shown in Figure 7, vertically laid extruded cement boards 100, 101 are attached with Z-clips 130 to horizontally continuous L-shaped base material 121 attached to a framework 120. The Z-clips 130 are fixed with fixing bolts 132 to square nuts 131 inserted into hollow portions 102 of the extruded cement boards 100, 101. The vertically laid extruded cement boards 100, 101 are attached with the hollow portions 102 extending in the vertical direction.

[0068] A water-repellent material 112 is sandwiched between the upper and lower extruded cement boards 100, 101, and a backup material 113 is attached to the outer surface of the hanging piece of the water-repellent material 112. A sealing material 114 is filled on the outdoor side of the horizontal joints 110 of these extruded cement boards 100, 101.

[0069] A third joint gasket 30 is inserted in a folded state between the vertically adjacent extruded cement boards 100, 101 on the indoor side of the horizontal joint 110. The third joint gasket 30 is inserted so as to contact the lower extruded cement board 101 and the base material 121 supporting the upper extruded cement board 100. The third joint gasket 30 is inserted with the center in the width direction W (short side direction) folded equally.

[0070] 8, the joints 110 of the vertically-attached extruded cement boards 100, 101 adjacent to each other in the left-right direction are sealed on the outside of the room with a sealant 114. The joints 110 extending vertically on the indoor side are fitted with a joint gasket 118 made of EPDM or other material with excellent weather resistance.

[0071] Thus, according to the second joint waterproofing structure 2, the third joint gasket 30 is inserted into the horizontal joint 110, which extends horizontally when the extruded cement boards 100, 101 are laid vertically. The inserted third joint gasket 30 is folded and compressed with the open-cell gasket 32 ​​facing inward, and inserted from the outside of the room so that the closed-cell gasket 11 contacts the base material 121 supporting the extruded cement board 100 and the extruded cement board 101. The open-cell gasket 12 is easily compressed, allowing it to be inserted efficiently in a folded state. After the third joint gasket 30 is inserted into the horizontal joint 110, the outside of the room is sealed with a backup material 113 and a sealant 114.

[0072] The third joint gasket 30 inserted into the joint 110 presses the closed-cell gasket 31 against the extruded cement boards 100, 101 with the repulsive force of the folded open-cell gasket 32 ​​as it tries to return to its original shape, and this state can be maintained. This makes it possible to improve the waterproof performance of the joint 110.

[0073] (Example of comparison of watertightness) Fig. 9 is a diagram showing the arrangement of the extruded cement boards 100, 101 of the first joint waterproofing structure 1 on which the watertightness test was conducted. In the test shown in Fig. 9, six extruded cement boards 100, 101 (test specimens) were installed horizontally to form a joint 110. The structures of the horizontal joint 110 and vertical joint 111 formed between the extruded cement boards 100, 101 are the structures shown in Figs. 5 and 6, and will be explained using the reference numerals in Figs. 5 and 6.

[0074] Below, using the arrangement of extruded cement boards 100, 101 shown in Figure 9 as an example, we will explain a test based on JIS-A1414 ``Performance test method for architectural panels'' to confirm the watertightness of an exterior wall material (Example) using the third joint gasket 30 of the present application and an exterior wall material (Comparative Example) using conventional gaskets 116, 117 (Figure 14).

[0075] In both the comparative example and the working example, a base was assembled on a frame 1980 mm wide and 1980 mm high (internal dimensions: width 1780 mm, height 1780 mm), and six extruded cement boards 100, 101 (test specimens) were attached horizontally as shown in Figure 9 to form joint section 110. Note that the drawing only shows the layout of extruded cement boards 100, 101 and the position of defect plate 119, which will be described below, and omits the frame for attaching the test specimens, etc.

[0076] In the comparative example, the compression load is 0.02 N / mm when compressed by 25%. 2 The closed-cell EPDM gasket was processed to a height of 15 mm, width of 50 mm, and length of 1780 mm for the extruded cement boards 100 and 101, and inserted into the vertical joint 111 so that the width direction (20 mm side) was compressed. The horizontal joint 110 was inserted into the vertical joint 111 so that the compressive load was 0.02 N / mm at 25% compression. 2 The closed-cell EPDM gasket was attached to the horizontal joint 110 of the extruded cement board 100, 101, measuring 15 mm high x 10 mm wide x approximately 870 mm long (862 mm), so that it was compressed in the height direction (15 mm side).

[0077] In the example, the structure is 10 mm high x 50 mm wide, and the compressive load is 0.002 N / mm when compressed by 25%. 2 The open-cell EPDM gasket has a height of 5 mm and a width of 50 mm, and the compressive load is 0.02 N / mm when compressed by 25%. 2 The closed-cell gaskets were laminated, and a polyethylene film was attached to the open-cell gasket surface. The third joint gasket 30 was then processed into a length of 1780 mm for the extruded cement boards 100 and 101, folded in half, and inserted into the vertical joint 111. The horizontal joint 110 was then fitted with a gasket that could withstand a compressive load of 0.02 N / mm at 25% compression. 2The closed-cell EPDM gasket was attached to the horizontal joint 110 so that the height direction (15 mm side) was compressed, with dimensions of 15 mm height x 10 mm width x approximately 870 mm length (862 mm) of the extruded cement boards 100, 101. Then, from the surface side, rock wool was inserted into the vertical joint 111, and backup material 113 was inserted into the vertical joint 111 and horizontal joint 110, and sealant 114 was filled in.

[0078] Additionally, two plates measuring 25 mm wide, 50 mm long, and 1 mm thick with multiple 0.25 mm protrusions spaced at regular intervals on their surfaces were used as defect plates 119, with a 0.5 mm gap between the protrusions. Defect plates 119 were inserted into three locations (positions indicated by arrows in the figure) in the vertical joints 111 and horizontal joints 110 of the extruded cement boards 100 and 101 of the example and comparative example, so that the defect plates 119 accounted for at least 5% of the length of the sealant poured on the exterior side. With defect plates 119 inserted, the defect rate of joints 110 and 111 was 8.4%.

[0079] Then, the extruded cement boards 100 and 101 having the joint structures of the comparative example and the example were attached to the dynamic air pressure device, and a wind pressure of 4 liters / min m was applied to the extruded cement boards 100 and 101. 2 Pressure was applied while spraying with water.

[0080] As a result of such testing, it was confirmed that the watertightness performance of the joint portion 110 in the structure of the comparative example was 3000 Pa, but in the structure of the example, the watertightness performance of the joint portion 110 was improved to 5000 Pa. Therefore, the third joint gasket 30 of the present application makes it possible to improve the watertightness of the joint portion 110. It can be said that the first joint gasket 10 and the second joint gasket 20, which have similar configurations, can also improve the watertightness in a similar manner.

[0081] (Summary) As described above, the joint gaskets 10, 20, and 30 according to the present application are easily compressed and improve watertightness due to the repulsive forces of the two types of materials: the open-cell gaskets 12, 22, and 32 and the closed-cell gaskets 11, 21, and 31. Moreover, the open-cell gaskets 12, 22, and 32 make them easier to bend and insert into the joint 110, improving workability.

[0082] Furthermore, with the joint gaskets 20, 30, the films 23, 33 provided on the surfaces of the open-cell gaskets 22, 32 enable them to be easily folded using the folding plate 41 of the insertion jig 40. Moreover, after folding the joint gaskets 20, 30, the folding plate 41 of the insertion jig 40 can be easily removed with little frictional resistance. Therefore, the joint gaskets 20, 30 enable further improvement in workability.

[0083] Furthermore, when two or more layers of closed-cell gaskets 11, 21, 31 and open-cell gaskets 12, 22, 32 are alternately stacked, the entire gasket is more easily compressed evenly during installation of the joint gaskets 10, 20, 30, improving installation efficiency. Moreover, after insertion into the joint 110, the open-cell gaskets 12, 22, 32 sandwiched between the closed-cell gaskets 11, 21, 31 rebound evenly, allowing the closed-cell gaskets 11, 21, 31 to more appropriately adhere to the joint 110, further improving watertightness. [Explanation of symbols]

[0084] 1 First joint waterproof structure 2 2nd joint waterproof structure 10. First joint gasket 11 Closed-cell gasket 12 Open-cell gasket 20 Second joint gasket 21 Closed-cell gasket 22 Open-cell gasket 23 Film 30 Third joint gasket 31 Closed-cell gasket 32 Open-cell gasket 33 Film 34 Bending section 40 Insertion jig 41 Bent Plate 100 Extruded cement board 101 Extruded cement board 110 Horizontal joint 111 Vertical joint 114 Sealant 116 Gasket 117 Gasket 118 Gasket 121 Base material 130 Z-Clip

Claims

1. A gasket for a joint used in a waterproof structure of a joint of an architectural panel, A predetermined length extending along the joint portion, It is made up of multiple layers of alternating closed-cell and open-cell gaskets. a film is attached to a surface of the open-cell gasket; a folded portion extending in the longitudinal direction is provided in the widthwise center of the surface to which the film is attached; Gasket for joints in architectural panels.

2. A waterproof joint structure in which a sealant is filled in the joints on the outer surface of a building panel, and a joint gasket is provided in the joints on the inner surface of the building panel, The joint gasket is a combination of multiple layers in which closed-cell gaskets and open-cell gaskets are alternately laminated, and is folded in the longitudinal direction at the center in the width direction to be provided in the joint on the inner surface side, The joint gasket has a film attached to a surface of the open-cell gasket, The waterproof structure for the joints of an architectural panel, wherein the gasket for the joints is folded so that the closed-cell gasket is on the contact side with the architectural panel and the film is on the inside and is installed in the joints.

3. The joint gasket has a folded portion extending in the longitudinal direction at the center in the width direction of the surface to which the film is attached. The waterproof structure for joints of a building panel according to claim 2.

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