Purpose gasket

Abstract

To provide a joint gasket with good appearance and guaranteed insertability into joints.SOLUTION: A joint gasket (1) is arranged in a joint (M) formed between two mutually adjacent exterior wall panels (300), and a first recess (71) is formed on an indoor side face of a connection portion between a lateral end (31) of a head (3) and a hollow lip (4).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a joint gasket and a joint sealing structure.

Background Art

[0002] Conventionally, in order to prevent water such as rainwater from entering the building through the joint formed between two adjacent outer wall panels and to keep the appearance of the building good, a joint gasket is used. The joint gasket is formed of a material having water tightness and elasticity such as rubber and resin. Further, the joint gasket is slightly wider than the joint width and has a longitudinal shape extending along the joint, and is inserted into the joint from the outdoor side and disposed in the joint.

[0003] In addition, the joint gasket is provided with a plurality of plate-like lips. This lip contacts the side surface of the outer wall panel forming the joint and serves to prevent rainwater or the like from entering the building through the joint. However, since the water stop by only the plate-like lip is insufficient, various research and developments have been conducted to improve the water stopping property and the like of the joint gasket.

[0004] For example, Patent Document 1 discloses a joint gasket including a column portion and a hollow seal portion provided on the outdoor side of the column portion, and a protrusion is formed on the head of the hollow seal portion toward the upper end portion of the column portion. Further, Patent Document 2 discloses a joint material in which a gap formed between a plate-like head and an outdoor side water stop lip and a gap formed between the outdoor side water stop lip and an indoor side water stop lip are each filled with a sealing material (foam). Furthermore, Patent Document 3 discloses a dry joint joiner including a top joint material in which a silicon-based coating layer is formed on the sealing surface of a cylindrical hollow seal portion.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, in the joint gasket disclosed in Patent Document 1, since the column part and the head part are separated, it is difficult to apply force from the outdoor side during insertion, and it is difficult to insert the joint gasket into the joint. Therefore, the insertability when inserting the joint gasket into the joint has been reduced. Further, in the joint material disclosed in Patent Document 2, since each of the gaps is filled with a sealing material, the degree of freedom of deformation is extremely low and the insertability has been reduced. In addition, in the joint material disclosed in Patent Document 2, since the head part is plate-shaped, the head part is likely to be curved concave on the indoor side in the state of being arranged at the joint, and there is a concern about deterioration of the appearance. Furthermore, in the dry joint joiner disclosed in Patent Document 3, in the state of being arranged at the joint, a relatively large gap may be formed between the outdoor side surface of the cylindrical hollow sealing part and the side surface of the outer wall panel. Therefore, a shadow is caused by the gap, and there is a concern about deterioration of the appearance.

[0007] One aspect of the present invention has been made in view of the above problems, and an object thereof is to provide a joint gasket having a good appearance and ensuring insertability into a joint. [Means for Solving the Problems]

[0008] In order to solve the above problems, the joint gasket according to Aspect 1 of the present invention is a joint gasket disposed in a joint formed between two adjacent outer wall panels, the joint gasket including: a column portion extending along the extending direction of the joint; a head portion connected to the outdoor-side end of the column portion, each of the side end portions facing the side surfaces of the two outer wall panels extending toward the side surfaces; and a lip extending from the side end portion and connected to the column portion on the indoor side of the outdoor-side end portion. A first recess is formed on the indoor-side surface of the connecting portion between the side end portion and the lip.

[0009] In the above configuration, since the column portion and the head portion are connected, it is easy to apply force from the head portion side during insertion, and the joint gasket can be easily inserted into the joint. Further, since the joint gasket is inserted into the joint so as to bend at the first recess formed on the indoor-side surface of the connecting portion between the side end portion of the head portion and the lip, the posture of the joint gasket during insertion is stabilized, and the joint gasket can be disposed in the joint in a desired arrangement mode. Further, in the above configuration, since the joint gasket is disposed in the joint in a state of being bent at the first recess, the amount and degree of the head portion being concave-curved toward the indoor side are reduced. Therefore, according to the above configuration, compared with the case where there is no first recess, the bending of the head portion can be suppressed, and the joint gasket can be disposed in the joint with the head portion being in a state close to flat.

[0010] Therefore, according to the above configuration, it is possible to realize a joint gasket having a good appearance and ensuring insertability into the joint.

[0011] The joint gasket according to Aspect 2 of the present invention may have a protrusion formed on the outdoor side near the connecting portion between the side end portion and the lip in Aspect 1.

[0012] When the joint gasket is disposed in the joint, a relatively large gap may be formed between the outdoor-side surface of the head portion and the side surface of the outer wall panel according to the size of the joint width, and a shadow may be generated. According to the above configuration, since a protrusion is formed on the outdoor side near the connecting portion between the side end portion of the head portion and the lip, the gap can be made relatively small, and it is difficult for a shadow to be generated.

[0013] In order to solve the above problems, the joint gasket according to Aspect 3 of the present invention is a joint gasket disposed at a joint formed between two adjacent outer wall panels, and includes a column portion extending along the extending direction of the joint, a head portion connected to the outdoor-side end of the column portion, and each of the side end portions facing the side surfaces of the two outer wall panels extending toward the side surfaces, and a lip extending from the side end portion and connected to the column portion on the indoor side of the outdoor-side end portion. A protrusion is formed on the outdoor side near the connection portion between the side end portion and the lip.

[0014] In the above configuration, since the column portion and the head portion are connected, it is easy to apply force from the head side during insertion, and the joint gasket can be easily inserted into the joint. Further, when the joint gasket is disposed at the joint, a relatively large gap may be formed between the outdoor-side surface of the head portion and the side surface of the outer wall panel according to the size of the joint width, which may cause a shadow. According to the above configuration, since a protrusion is formed on the outdoor side near the connection portion between the side end portion of the head portion and the lip, the gap is made relatively small, and it is difficult for a shadow to occur.

[0015] Therefore, according to the above configuration, it is possible to realize a joint gasket having a good appearance and ensuring insertability into the joint.

[0016] The joint gasket according to Aspect 4 of the present invention may have a first recess formed on the indoor-side surface of the connection portion between the side end portion and the lip in Aspect 3.

[0017] In the above configuration, since the joint gasket is inserted into the joint so as to bend at the first recess formed on the indoor-side surface of the connection portion between the side end portion of the head portion and the lip, the posture of the joint gasket during insertion is stabilized, and the joint gasket can be disposed at the joint in a desired arrangement mode. Therefore, according to the above configuration, the insertability when inserting the joint gasket into the joint is improved.

[0018] Further, in the above configuration, since the joint gasket is arranged at the joint in a bent state in the first recess, the amount and degree of the head being curved concavely toward the indoor side are reduced. Therefore, according to the above configuration, compared with the case where there is no first recess, the bending of the head can be suppressed, and the joint gasket can be arranged at the joint with the head in a state closer to being flat.

[0019] The joint gasket according to Aspect 5 of the present invention, in the above Aspect 2 or 4, further includes a design portion that covers the head and a part of the lip from the outdoor side, and a foam body provided at an interval from the design portion on the surface of the lip facing the side surface. In a state where the joint gasket is arranged at the joint, each of the design portion and the foam body may be in surface contact with the side surface.

[0020] The design portion can be made of a different material that is easier to color than the head. Therefore, according to the above configuration, by providing the design portion on the outdoor side of the head, the surface on the outdoor side of the joint gasket can be made a color close to the color of the outer wall panel, and the appearance of the building can be improved.

[0021] Further, since the foam body has relatively high flexibility, it has high followability even when the joint width increases or decreases, and it is easy to ensure the water-stopping property of the portion in surface contact. Therefore, in a state where the joint gasket is arranged at the joint, for example, the volume of the water-conducting space defined by the gap surrounded by the side surface of the outer wall panel, the design portion, and the foam body can be made relatively small, and the amount of water that can enter the water-conducting space can be made relatively small. Therefore, according to the above configuration, the amount of water that penetrates into the surface material inside the outer wall panel can be made relatively small, and it is easy to ensure the water-stopping property even when the joint width is different.

[0022] The joint gasket according to Aspect 6 of the present invention, in the above Aspect 5, the lip includes a first wall portion that extends obliquely inward from the side end portion toward the side surface, a second wall portion that bends from the first wall portion and extends inward, and a third wall portion that bends from the second wall portion, extends obliquely inward toward the column portion, and is connected to the column portion. The foam body may be provided across the second wall portion and the third wall portion.

[0023] In the above configuration, since there are more bending points of the lip, when the joint gasket is disposed at the joint, the lip is more likely to elastically deform at each bending point, and it becomes easier for the design portion and the foam to be more elastically in contact with the side surface of the outer wall panel by the lip. Further, since the foam is provided across the second wall portion and the third wall portion, the set length of the foam becomes longer, and the contact area of the foam with respect to the side surface of the outer wall panel can be increased. Therefore, according to the above configuration, the adhesion of the design portion and the foam to the side surface of the outer wall panel is further improved, and the water-stopping property is further improved.

[0024] In the joint gasket according to the aspect 7 of the present invention, in the above aspect 6, a second recess may be formed on the surface on the column portion side of the connecting portion between the first wall portion and the second wall portion.

[0025] In the above configuration, since the joint gasket bends at two points of the first recess and the second recess during insertion, the first wall portion is likely to be substantially parallel to the side surface of the outer wall panel. When the joint gasket elastically deforms in this way, the design portion provided on the outdoor side of the first wall portion is elastically in contact with the side surface of the outer wall panel while the joint gasket is inserted into the joint, and the posture of the joint gasket becomes more stable during insertion. Therefore, according to the above configuration, the insertability when inserting the joint gasket into the joint is further improved.

[0026] In the joint gasket according to the aspect 8 of the present invention, in the above aspect 6 or 7, the second wall portion is curved to be convex on the column portion side, the design portion is provided across the first wall portion and the second wall portion, and the maximum width in the joint width direction of the two foams facing each other with the column portion interposed therebetween may be larger than the maximum width in the joint width direction of the design portion.

[0027] In the above configuration, when the joint gasket is disposed at the joint, the second wall portion is more likely to bend toward the column portion side, and the distance between the design portion and the foam becomes smaller. At the same time, the angle formed by the side surface of the design portion covering the second wall portion and the outdoor side surface of the foam is bent and deformed so that it becomes even smaller (rotates) in the state of being disposed at the joint than before being disposed at the joint. Therefore, according to the above configuration, the volume of the water-conducting space can be made smaller, and the water-stopping property of the joint gasket is further improved.

[0028] In order to solve the above problems, a seal structure according to Embodiment 9 of the present invention includes two adjacent outer wall panels and a joint gasket disposed at a joint formed between the two outer wall panels. The joint gasket includes a column portion extending along the extending direction of the joint, a head portion connected to the outdoor side end of the column portion, and each of the side end portions facing the side surfaces of the two outer wall panels extending toward the side surfaces, and a lip extending from the side end portion and connected to the column portion on the indoor side of the outdoor side end portion. A first recess is formed on the indoor side surface of the connecting portion between the side end portion and the lip, or a protrusion is formed on the outdoor side near the connecting portion between the side end portion and the lip.

[0029] In the above structure, since the column portion and the head portion are connected, it is easy to apply force from the head portion side during insertion, and the joint gasket is easily inserted into the joint.

[0030] In addition, when a first recess is formed on the indoor side surface of the connecting portion between the side end portion of the head portion and the lip, the joint gasket is inserted into the joint so as to bend at the first recess formed at the connecting portion between the side end portion of the head portion and the lip. Therefore, the posture of the joint gasket during insertion is stable, and the joint gasket can be disposed at the joint in a desired arrangement. Further, since the joint gasket is disposed at the joint in a state of being bent at the first recess, the amount and degree of the head portion being curved inwardly in a concave shape are reduced. Therefore, according to the above structure, compared with the case where there is no first recess, the bending of the head portion can be suppressed, and the joint gasket can be disposed at the joint with the head portion being nearly flat.

[0031] In addition, when the joint gasket is disposed at the joint, a relatively large gap may be formed between the outdoor side surface of the head and the side surface of the outer wall panel according to the size of the joint width, which may cause a shadow. When a protrusion is formed on the outdoor side near the connecting portion between the side end portion and the lip, since the protrusion is formed on the outdoor side near the connecting portion between the side end portion of the head and the lip, the gap can be made relatively small, making it difficult for a shadow to occur.

[0032] Therefore, according to the above configuration, it is possible to realize a joint seal structure that has a good appearance and ensures insertability into the joint.

Effect of the Invention

[0033] According to one aspect of the present invention, it is possible to provide a joint gasket that has a good appearance and ensures insertability into the joint.

Brief Description of the Drawings

[0034]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0035] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. For the sake of convenience of explanation, members having the same functions as the members described in this embodiment are denoted by the same reference numerals in the following modification examples, and the description thereof will not be repeated.

[0036] 〔Outline and Configuration of Joint Gasket 1〕 <Outline of Joint Gasket 1> The joint gasket 1 according to an embodiment of the present invention is a joint material arranged at the joint M to prevent water such as rainwater from entering the building (not shown) from the joint M and to keep the appearance of the building good. The joint M is a gap formed between two adjacent outer wall panels 300 as shown by reference numeral 2001 in FIG. 2. The outer wall panel 300 includes a facing material 310, a base material 320, and a heat insulating board 330, and is arranged in the order of the facing material 310, the base material 320, and the heat insulating board 330 from the outdoor side (see reference numeral 3002 in FIG. 3).

[0037] In addition, in the state where the joint gasket 1 is disposed at the joint M, as shown by reference numeral 2001 in FIG. 2, a seal structure 500 of the joint M having the joint gasket 1 and the two outer wall panels 300 as essential components is established. This seal structure 500 has a good appearance and also ensures the insertability of the joint gasket 1. Further, according to this seal structure 500, some water that could not be prevented from entering in the design portion 5 described later is stopped by the first foam body 6 provided in the hollow lip described later, and the water enters from the side surface 312 of the outer wall panel 300 into the inside of the outer wall panel 300, It is possible to effectively reduce the deterioration of the outer wall panel 300. In other words, long-term continuous use of the outer wall panel 300 can be realized.

[0038] <Configuration of the joint gasket 1> The configuration of the joint gasket 1 will be described with reference to FIGS. 1 and 2. In the following description of the present embodiment, unless otherwise specified, the "outer wall panel 300" refers to the facing material 310. As shown by reference numeral 1001 in FIG. 1 and FIG. 2, the joint gasket 1 includes a column portion 2, a head portion 3, and a hollow lip 4. In the present embodiment, the joint gasket 1 is configured such that the column portion 2, the head portion 3, and the hollow lip 4 are connected in series. Further, the joint gasket 1 includes a design portion 5 that covers the head portion 3 and the hollow lip 4 from the outdoor side, and a first foam body (foam body) 6 provided on the surface of the hollow lip 4 facing the side surface 312 of the outer wall 100.

[0039] As the forming material of the column portion 2, the head portion 3, and the hollow lip 4 of the joint gasket 1, a rubber-like elastic body such as synthetic rubber or TPE (thermoplastic elastomer) is used. Examples of synthetic rubber include EPDM, and examples of TPE include TPO (olefin-based thermoplastic elastomer) and TPS (styrene-based thermoplastic elastomer), but are not limited thereto. Further, the rubber-like elastic body used as the forming material of the column portion 2, the head portion 3, and the hollow lip 4 of the joint gasket 1 may be a foamed material or a non-foamed material.

[0040] (Column portion 2) The column part 2 is a part that extends along the extending direction of the joint M. As shown by the reference numeral 1001 in FIG. 1, the column part 2 has a first column part 21 and a second column part 22. The first column part 21 is a part arranged on the outdoor side rather than the second column part 22. The first column part 21 includes an outdoor side end part 211 connected to the indoor side of the head part 3 and a column base part 212 continuous with the indoor side of the outdoor side end part 211. The outdoor side end part 211 is arranged at the outermost outdoor side among the respective parts constituting the column part 2. The width of the outdoor side end part 211 in the joint width W direction increases as going from the indoor side to the outdoor side. Thereby, the strength of the connection part between the column part 2 and the head part 3 can be enhanced. The column base part 212 is arranged on the indoor side of the outdoor side end part 211. The width of the column base part 212 in the joint width W direction is constant, and is the first column part width T1 in the present embodiment.

[0041] The second column part 22 is a part arranged on the indoor side rather than the first column part 21, and is formed wider than the first column part width T1 of the first column part 21. The second column part 22 includes a bulging part 221 connected to the indoor side of the first column part 21 and an indoor side end part 222 continuous with the indoor side of the bulging part 221.

[0042] The width of the bulging part 221 increases as going from the connection location with the first column part 21 toward the indoor side. In the present embodiment, the maximum width of the bulging part 221 is the second column part width T2. Also, the width of the bulging part 221 decreases as going from the part of the second column part width T2 toward the indoor side. The indoor side end part 222 is continuous with the indoor side of the bulging part 221. The indoor side end part 222 is arranged at the innermost indoor side among the respective parts constituting the column part 2. The width of the indoor side end part 222 in the joint width W direction is constant, is larger than the first column part width T1 of the column base part 212, and is smaller than the second column part width T2 of the bulging part 221.

[0043] In the column part 2, a metal core material 23 is embedded across the inside of the column base part 212 of the first column part 21 and the bulging part 221 of the second column part 22. One end of the core material 23 on the outdoor side is bent at one place. On the other hand, one end of the core material 23 on the indoor side is bent at three places so that the cross-sectional view seen from the extending direction of the joint M has substantially the same outer shape as the cross-sectional shape of the bulging part 221. Thereby, the rigidity of the second column part 22 arranged on the indoor side becomes higher than the rigidity of the first column part 21 arranged on the outdoor side. Therefore, in the process of inserting the joint gasket 1 into the joint M, it is possible to reduce the entire joint gasket 1 from tilting more than necessary or unintentionally. Therefore, the posture of the joint gasket 1 at the time of insertion becomes more stable.

[0044] However, it is not essential to design the shape and internal structure of the column part 2 as in this embodiment. For example, the width T1 of the first column part and the width T2 of the second column part may be substantially the same. Also, for example, the core material 23 does not have to be made of metal, and the core material 23 does not have to be embedded inside the column part 2. Furthermore, the shape and size of the core material 23 may be arbitrarily designed and changed.

[0045] (Head part 3) As shown by reference numeral 1001 in FIG. 1, the head part 3 is a part that is connected to the outdoor side end part 211 of the column part 2 and extends along the extending direction of the joint M so as to cover the joint M. The head part 3 is connected to the outdoor side end part 211 of the column part 2 so that the cross-sectional view seen from the extending direction of the joint M has a substantially T-shaped cross section. As shown by reference numeral 2001 in FIG. 2, in the head part 3, each of the two side end parts 31 facing the side surfaces 312 of the two outer wall panels 300 extends toward the side surfaces 312. As shown in FIG. 1, the head part 3 becomes thinner toward the side end part 31. Specifically, the outdoor side surface of the head part 3 is gently curved so as to be convex toward the outdoor side, and the indoor side surface of the head part 3 is substantially flat.

[0046] In this way, as the head 3 becomes thinner toward the side end 31, the head 3 becomes more easily deformable toward the side end 31, and the joint gasket 1 is more easily bent at the first recess 71 described later. However, it is not essential to design the shape of the head 3 as in this embodiment. For example, the head 3 may have a substantially constant thickness.

[0047] (Hollow lip 4) The hollow lip 4 extends from the side end 31 of the head 3 and is a lip connected to the column part 2 inside the house rather than the outdoor side end 211. As shown by the reference numeral 2001 in FIG. 2, this hollow lip 4 is a lip protruding toward the outer wall panel 300 and serves to prevent water from entering the joint M from the outdoor side. Specifically, the joint gasket 1 includes two hollow lips 4, namely, a hollow lip 4 facing the side surface 312 of one outer wall panel 300 and a hollow lip 4 facing the other outer wall panel 300 and extending toward it.

[0048] As shown in FIG. 1, the hollow lip 4 has a first wall portion 41, a second wall portion 42, and a third wall portion 43. The first wall portion 41 is a wall portion that extends obliquely inward from the side end 31 of the head 3 toward the side surface 312 of the outer wall 100. The second wall portion 42 is a wall portion that bends from the first wall portion 41 and extends inward. The third wall portion 43 is a wall portion that bends from the second wall portion 42, extends obliquely inward toward the column part 2, and is connected to the column part 2. In this embodiment, the third wall portion 43 is connected to the connecting portion between the bulging portion 221 and the indoor side end 222 of the second column portion 22. The second wall portion 42 is gently curved so as to be convex toward the column part 2 side. On the other hand, the third wall portion 43 is gently curved so as to be concave toward the column part 2 side.

[0049] In the joint gasket 1, a first recess 71 is formed on the indoor side surface of the connecting portion between the side end portion 31 of the head 3 and the first wall portion 41 of the hollow lip 4. Further, in the joint gasket 1, in addition to the first recess 71, a second recess 72 is formed on the surface on the pillar portion 2 side of the connecting portion between the first wall portion 41 and the second wall portion 42 of the hollow lip 4. As a result, when inserting, the joint gasket 1 bends at two points, the first recess 71 and the second recess 72, so that the first wall portion 41 is likely to be substantially parallel to the side surface 312 of the outer wall panel 300 (see reference numeral 2001 in FIG. 2). When the joint gasket 1 elastically deforms in this way, the design portion 5 provided on the outdoor side of the first wall portion 41 is elastically abutted against the side surface 312 of the outer wall panel 300 while the joint gasket 1 is inserted into the joint M, and the posture of the joint gasket 1 becomes more stable during insertion. Therefore, the insertability when inserting the joint gasket 1 into the joint M is further improved.

[0050] (Design portion 5) The design portion 5 is a coating layer that covers a part of the head 3 and the hollow lip 4 from the outdoor side. The outdoor side surface of the design portion 5 is color - adjusted by coating or covering with a coloring material, and forms the design surface of the joint gasket 1. That is, the outdoor side surface of the design portion 5 is formed so as to have less incongruity with respect to the outdoor side surface 314 of the outer wall panel 300. That is, the design portion 5 can be made of a different material that is easier to color than the head 3. Therefore, by providing the design portion 5 on the outdoor side of the head 3, the outdoor side surface of the joint gasket 1 can be made a color close to the color of the outer wall panel 300, and the appearance of the building can be improved.

[0051] In the present embodiment, the design portion 5 is provided so as to straddle the head 3 and the first wall portion 41 and the second wall portion 42 of the hollow lip 4 connected to the head 3. A part of the design portion 5 provided on the first wall portion 41 elastically deforms so as to be in surface contact with the side surface 312 of the outer wall panel 300 in a state where the joint gasket 1 is arranged at the joint M. The forming material of the design portion 5 may be different from the forming material of the joint gasket 1 as long as it does not inhibit the bending of the head 3 and the hollow lip 4 when the joint gasket 1 is inserted into the joint M. Of course, it may be the same forming material as the forming material of the joint gasket 1.

[0052] Further, in the design portion 5, two protrusions 51 extending parallel to each other are formed near the connecting portion between the lateral end portion 31 of the head portion 3 and the hollow lip 4, that is, near the first recess 71, on the outdoor side. By forming this protrusion on the design portion 5, as will be described later, the gap between the outdoor side surface of the head portion 3 and the side surface 312 of the outer wall panel 300 can be made relatively small, making it difficult for shadows to occur.

[0053] Note that the design portion 5 is not essential and may be omitted. When the design portion 5 is omitted, the protrusion 51 may be directly formed on the outdoor side of the connecting portion between the lateral end portion 31 of the head portion 3 and the hollow lip 4.

[0054] (First foam 6) The first foam 6 is composed of, for example, a highly flexible high-foam sponge or the like. The first foam 6 is provided between the foam outdoor end P2, which is the outdoor side end of the first foam 6, and the foam indoor end P3, which is the indoor side end of the first foam 6, across the second wall portion 42 and the third wall portion 43 on the surface of the hollow lip 4 facing the side surface 312 of the outer wall panel 300. The design portion 5 and the first foam 6 are arranged with a gap L5 therebetween, as shown by reference numeral 1002 in FIG. 1. The gap L5 is the distance in the depth direction of the joint M between the design portion indoor end P1, which is the indoor side end of the design portion 5, and the foam outdoor end P2. As shown in FIG. 2, in the state where the joint gasket 1 is arranged at the joint M, each of the design portion 5 and the first foam 6 is in surface contact with the side surface 312 of the outer wall panel 300. Since the first foam 6 has relatively high flexibility, it has high followability even when the joint width W increases or decreases, and it is easy to ensure the water tightness of the surface contact portion.

[0055] Also, when inserting the joint gasket 1 into the joint M, first, the first foam 6 elastically deforms so as to be in surface contact with the side surface 312 of the outer wall panel 300. Next, since the joint gasket 1 is formed with the first recess 71 and the second recess 72 described above, when the joint gasket 1 is inserted, it bends at two points, namely the first recess 71 and the second recess 72, and elastically deforms so that the first wall portion 41 becomes substantially parallel to the side surface 312 of the outer wall panel 300, and a part of the design portion 5 provided on the outdoor side of the first wall portion 41 comes into surface contact with the side surface 312 of the outer wall panel 300. As a result, the angle θ formed by the surface on the side surface 312 side of the second wall portion 42 of the design portion 5 and the outdoor side surface of the first foam 6 becomes smaller. Specifically, the angle θ2 (refer to reference numeral 2002 in FIG. 2) after being arranged at the joint M is smaller than the angle θ1 (refer to reference numeral 1002 in FIG. 1) before being arranged at the joint M. Further, as described above, since the second wall portion 42 is gently curved so as to be concave on the column portion 2 side, when the joint gasket 1 is inserted into the joint M, the second wall portion 42 deflects and deforms toward the column portion 2 side. As a result, the angle θ2 after being arranged at the joint M is smaller than the angle θ1 before being arranged at the joint M. From the above, in the state where the joint gasket 1 is arranged at the joint M, the volume of the water conduction space S defined by the gap surrounded by the side surface 312 of the outer wall panel 300, the design portion 5, and the first foam 6 becomes relatively small, and the amount of water that can enter the water conduction space S can be made relatively small. Therefore, the amount of water seeping into the surface material 310 of the outer wall panel 300 can be made relatively small, and it becomes easier to ensure water tightness even when the joint width W is different. is smaller. From the above, in the state where the joint gasket 1 is arranged at the joint M, the volume of the water conduction space S defined by the gap surrounded by the side surface 312 of the outer wall panel 300, the design portion 5, and the first foam 6 becomes relatively small, and the amount of water that can enter the water conduction space S can be made relatively small. Therefore, the amount of water seeping into the surface material 310 of the outer wall panel 300 can be made relatively small, and it becomes easier to ensure water tightness even when the joint width W is different.

[0056] 〔Behavior of the hollow lip of the joint gasket 1 during the insertion process〕 Next, with reference to FIG. 2, the behavior of the hollow lip 4 in the process of inserting the joint gasket 1 into the joint M will be described. First, the indoor-side end 222 of the column portion 2 is inserted into the room from the opening of the joint M, thereby starting the insertion of the joint gasket 1 into the joint M. At this time, since the column portion 2 and the head portion 3 are connected to each other in the joint gasket 1, it is easy to apply a force from the head portion 3 side, and the joint gasket 1 can be easily inserted into the joint M. The opening of the joint M is formed by the inclined surfaces 311 of the two outer wall panels 300, as indicated by reference numeral 2001 in FIG. 2.

[0057] Immediately after the start of the insertion, the first foam 6 comes into contact with the inclined surface 311. As the insertion progresses further, surface contact between the first foam 6 and the side surface 312 of the outer wall panel 300 begins. As the insertion progresses, the contact area between the first foam 6 and the side surface 312 increases, and when the first foam 6 is disposed on the indoor side of the boundary line between the inclined surface 311 and the side surface 312, the contact area between the first foam 6 and the side surface 312 becomes maximum.

[0058] From the start of the surface contact between the first foam 6 and the side surface 312 until the contact area becomes maximum, as the insertion progresses, the hollow lip 4 is pressed by the first foam 6 toward the column portion 2 side, and the third wall portion 43 and the second wall portion 42 are bent toward the column portion 2 side in this order. As a result, the second wall portion 42 becomes convex toward the column portion 2 side so that the angle θ formed by the design portion 5 and the first foam 6 becomes smaller, the interval L5 becomes shorter, and the design portion 5 and the first foam 6 approach each other.

[0059] After the contact area between the first foam body 6 and the side surface 312 reaches its maximum and further insertion progresses, the design portion 5 comes into surface contact with the side surface 312. More specifically, the hollow lip 4 is pressed by the design portion 5 toward the column portion 2 side and bends toward the column portion 2 side in the order of the second wall portion 42 and the first wall portion 41. At this time, the joint gasket 1 bends at two points, the first recess 71 and the second recess 72, and the first wall portion 41 elastically deforms so as to be substantially parallel to the 312 side surface, and the design portion 5 provided on the outdoor side of the first wall portion 41 comes into surface contact with the side surface 312. When the joint gasket 1 elastically deforms in this way, the design portion 5 provided on the outdoor side of the first wall portion 41 comes into elastic contact with the side surface 312 while the joint gasket 1 is inserted into the joint M, and the posture of the joint gasket 1 becomes more stable during insertion. Therefore, the insertability when inserting the joint gasket 1 into the joint M is further improved.

[0060] When the design portion 5 provided on the outdoor side of the first wall portion 41 is disposed at a position near the boundary line between the inclined surface 311 and the side surface 312, the insertion of the joint gasket 1 into the joint M is completed, and the joint gasket 1 is in a state of being disposed in the joint M as shown by reference numeral 2001 in FIG. 2. Here, the water conduction space S decreases in volume as the insertion of the joint gasket 1 into the joint M progresses, and the water conduction space S is minimized when the insertion of the joint gasket 1 into the joint M is completed.

[0061] Also, since the joint gasket 1 is disposed at the first recess 71 in a bent state, the amount and degree of the head 3 curving concave toward the indoor side are reduced. Therefore, the bending of the head 3 can be suppressed, and the joint gasket 1 can be disposed in the joint M with the head 3 being close to flat.

[0062] Furthermore, in a state where the joint gasket is disposed in the joint, a relatively large gap may be formed between the outdoor side surface of the head and the side surface of the outer wall panel according to the size of the joint width, and a shadow may be generated. According to the above configuration, since a protrusion is formed on the outdoor side near the connecting portion between the side end portion of the head and the lip, the gap is made relatively small and it is difficult for a shadow to be generated.

[0063] 〔Merits of the joint gasket 1〕 Since the target gasket 1 has the characteristic configuration described above, it has various advantages in terms of water stoppage and insertability. Hereinafter, the advantages of the target gasket 1 will be described with reference to FIGS. 1 and 2. In the target gasket 1 according to the present embodiment, it is preferable that the column portion 2 and the head portion 3 are connected. If the column portion 2 and the head portion 3 are separated, it is difficult to apply force from the outdoor side during insertion, and it becomes difficult to insert the target gasket 1 into the joint M. In this regard, in the target gasket 1, since the column portion 2 and the head portion 3 are connected, it is easy to apply force from the head portion 3 side during insertion, and the target gasket 1 can be easily inserted into the joint M. 1 will be described.

[0064] <Connection between the column portion 2 and the head portion 3> In the target gasket 1 according to the present embodiment, it is preferable that the column portion 2 and the head portion 3 are connected. If the column portion 2 and the head portion 3 are separated, it is difficult to apply force from the outdoor side during insertion, and it becomes difficult to insert the target gasket 1 into the joint M. In this regard, in the target gasket 1, since the column portion 2 and the head portion 3 are connected, it is easy to apply force from the head portion 3 side during insertion, and the target gasket 1 can be easily inserted into the joint M.

[0065] <Formation of the first recess 71> In the target gasket 1 according to the present embodiment, it is preferable that the first recess 71 is formed on the indoor side surface of the connection portion between the side end portion 31 of the head portion 3 and the hollow lip 4. As a result, since the target gasket 1 is inserted into the joint M so as to bend at the first recess 71, the posture of the target gasket 1 during insertion is stabilized, and the target gasket 1 can be arranged in the joint M in a desired arrangement mode. Further, since the target gasket 1 is arranged in the joint M in a state of being bent at the first recess 71, the amount and degree of the head portion 3 being curved concavely toward the indoor side are reduced. Therefore, compared with the case where the first recess 71 is not provided, the bending of the head portion 3 can be suppressed, and the target gasket 1 can be arranged in the joint M with the head portion 3 being close to flat.

[0066] <Formation of the second recess 72> In the joint gasket 1 according to the present embodiment, it is preferable that a second recess 72 is formed on the surface on the column portion side of the connecting portion between the first wall portion 41 and the second wall portion 42 of the hollow lip 4. Thereby, when inserting, the joint gasket 1 bends at two points of the first recess 71 and the second recess 72, so that the first wall portion 41 is likely to be substantially parallel to the side surface 312 of the outer wall panel 300. When the joint gasket 1 elastically deforms in this way, the design portion 5 provided on the outdoor side of the first wall portion 41 is elastically contacted with the side surface 312 of the outer wall panel 300 while the joint gasket 1 is inserted into the joint, and the posture of the joint gasket 1 becomes more stable during insertion. Therefore, the insertability when inserting the joint gasket 1 into the joint M is further improved.

[0067] Note that it is not essential that the second recess 72 is formed on the surface on the column portion side of the connecting portion between the first wall portion 41 and the second wall portion 42 of the hollow lip 4. Even if the second recess 72 is not formed, since the joint gasket 1 bends at the first recess 71 during insertion, the joint gasket 1 is ensured to have a good appearance and insertability.

[0068] <4. Formation of the protrusion 51> In the joint gasket 1 according to the present embodiment, it is preferable that a protrusion 51 is formed near the connecting portion between the side end portion 31 of the head portion 3 and the hollow lip 4, that is, on the outdoor side near the first recess 71. In a state where the joint gasket 1 is arranged at the joint M, a relatively large gap may be formed between the outdoor side surface of the head portion 3 and the side surface 312 of the outer wall panel 300 according to the size of the joint width W, and a shadow may be generated. In this regard, in the joint gasket 1, since the protrusion 51 is formed on the outdoor side near the connecting portion between the side end portion 31 of the head portion 3 and the hollow lip 4, the gap can be made relatively small and it is difficult to generate a shadow.

[0069] Note that the protrusion 51 may have any shape as long as it is difficult to generate the shadow. The protrusion 51 may be, for example, a shape protruding to the outdoor side, or a shape extending to the inclined surface 311 or the side surface 312 side of the outer wall panel 300.

[0070] <5. Surface contact between the design portion 5 and the first foam 6 and the side surface 312 of the outer wall panel 300> In the state where the joint gasket 1 according to this embodiment is disposed at the joint M, it is preferable that each of the design portion 5 and the first foam 6 is in surface contact with the side surface 312 of the outer wall panel 300. Since the first foam 6 is relatively highly flexible, even if the joint width W increases or decreases, it has high followability and it is easy to ensure the water stoppage property of the portion in surface contact. Therefore, in the state where the joint gasket 1 is disposed at the joint M, the volume of the water-conducting space S defined by the gap surrounded by the side surface 312 of the outer wall panel 300, the design portion 5, and the first foam 6 can be made relatively small, and the amount of water that can enter the water-conducting space S can be made relatively small. Accordingly, the amount of water that penetrates into the facing material 310 of the outer wall panel 300 can be made relatively small, and it becomes easy to ensure the water stoppage property even when the joint width W is different.

[0071] Further, even if a part of the water from the outside passes through the contact portion between the design portion 5 and the side surface 312 of the outer wall panel 300, most of them can be blocked at the portion where the first foam 6 and the side surface 312 are in surface contact.

[0072] For example, the side surface 312 of the outer wall panel 300 has fine irregularities instead of a uniform flat surface. Therefore, if the first foam 6 and the side surface 312 are in line contact, fine openings are formed at these contact portions, and water passes through these openings and penetrates more into the indoor side. On the other hand, in the state where the joint gasket 1 is disposed at the joint M, as shown by reference numeral 2001 in FIG. 2, since the first foam 6 and the side surface 312 are in surface contact, the openings are not formed continuously as compared with the case where they are in line contact. Therefore, it is possible to reduce the infiltration of a part of the water that could not be completely prevented from infiltrating at the design portion 5 into the indoor side more than in the case where the first foam 6 and the side surface 312 are in line contact.

[0073] From these aspects, the joint gasket 1 according to the present embodiment can effectively reduce the water that has entered the joint M from passing through, for example, the side surface 312 of the outer wall panel 300 and reaching the back surface 313 of the outer wall panel 300. Further, the joint gasket 1 according to the present embodiment can also effectively reduce the water that has entered the joint M from entering the inside of the outer wall panel 300 from the side surface 312.

[0074] <6. Formation of the water conduction space S> In the state where the joint gasket 1 according to the present embodiment is disposed at the joint M, it is preferable that each of the design portion 5 and the first foam body 6 is in surface contact with the side surface 312, and the water conduction space S formed by the gap surrounded by the side surface 312 of the outer wall panel 300, the design portion 5, and the first foam body 6 is minimized.

[0075] Since the first foam body 6 has relatively high flexibility, it has high followability even when the joint width M increases or decreases, and it is easy to ensure the water stoppage property of the portion in surface contact with the side surface 312. Therefore, in the state where the joint gasket 1 is disposed at the joint M, the volume of the water conduction space S can be made relatively small, and the amount of water that can enter the water conduction space S can be made relatively small. Accordingly, the amount of water that penetrates into the facing material 310 inside the outer wall panel 300 can be made relatively small, and it becomes easy to ensure the water stoppage property even when the joint width M is different.

[0076] Note that, in the state where the joint gasket 1 is disposed at the joint M, the design portion 5 and the first foam body 6 may be in contact with each other. Thereby, it is possible to reduce the water conduction space S and make the amount of water that can enter the water conduction space S relatively small.

[0077] <7. Arrangement of the hollow lip 4, the design portion 5, and the first foam body 6> In the joint gasket 1 according to this embodiment, it is preferable that the hollow lip 4 includes a first wall portion 41, a second wall portion 42, and a third wall portion 43. Further, the design portion 5 is provided across the first wall portion 41 and the second wall portion 42, and it is preferable that the first foam body 6 is provided across the second wall portion 42 and the third wall portion 43. As a result, since the number of bending points of the hollow lip 4 increases, when the joint gasket 1 is arranged at the joint M, the lip is more easily elastically deformed at each bending point, and the design portion 5 and the first foam body 6 are more easily elastically contacted with the side surface 312 of the outer wall panel 300 by the hollow lip 4. Further, since the first foam body 6 is provided across the second wall portion 42 and the third wall portion 43, the set length of the first foam body 6 becomes longer, and the contact area of the first foam body 6 with respect to the side surface 312 of the outer wall panel 300 can be increased. Therefore, the adhesion of the design portion 5 and the first foam body 6 to the side surface 312 of the outer wall panel 300 is further improved, and the water-stopping property is further improved.

[0078] <8. Dimension design of the joint width W direction of the joint gasket 1> As shown by the reference numeral 1001 in FIG. 1, in the joint gasket 1 according to this embodiment, in the state before the joint gasket 1 is arranged at the joint M, the widths of the two first foam bodies 6 facing each other across the column portion 2 in the joint width W direction are the largest in the vicinity of the connecting portion between the second wall portion 42 and the third wall portion 43, and the maximum width is L1. Similarly, the widths of the two hollow lips 4 facing each other across the column portion 2 in the joint width W direction are also the largest in the vicinity of the connecting portion, and the maximum width is L2. Further, the width of the head portion 3 in the joint width W direction, that is, the distance between the tips of the two side end portions 31, is the maximum width L3. Furthermore, the width of the design portion 5 in the joint width W direction is the largest in the vicinity of the connecting portion between the first wall portion 41 and the second wall portion 42, and the maximum width is L4. In the joint gasket 1 according to this embodiment, it is preferable that the dimensions of each part in the joint width W direction are designed so as to increase in the order of the maximum width L3, the maximum width L2, the maximum width L4, and the maximum width L1, but this is not essential. For example, the maximum width L2 and the maximum width L4 may be the same, or the maximum width L4 may be larger than the maximum width L2.

[0079] In the joint gasket 1 according to this embodiment, the second wall portion 42 is gently curved so as to be convex toward the column portion 2 side, the design portion 5 is provided across the first wall portion 41 and the second wall portion 42, and the first foam body 6 is provided across the second wall portion 42 and the third wall portion 43. As described above, it is preferable that the maximum width L1 of the first foam body 6 is larger than the maximum width L4 of the design portion 5. Thereby, in the state where the joint gasket 1 is arranged at the joint M, the second wall portion 42 is more likely to bend toward the column portion 2 side, and the distance L5 between the design portion 5 and the first foam body 6 becomes smaller. At the same time, the angle θ formed by the surface on the side surface 312 side of the design portion 5 covering the second wall portion 42 and the outdoor side surface of the first foam body 6 is smaller (rotates) in the state arranged at the joint M (angle θ2) than before being arranged at the joint M (angle θ1). Therefore, the volume of the water conduction space S can be made smaller, and the water-stopping property of the joint gasket 1 is further improved.

[0080] <9. Arrangement design of the design portion 5 and the first foam body 6> Further, in the joint gasket 1 according to this embodiment, it is preferable that the design portion 5 and the first foam body 6 are separated from each other before the joint gasket 1 is arranged at the joint M. This is because, if the design portion 5 and the first foam body 6 are connected, the degree of freedom of deformation of the hollow lip 4 is hindered, and the insertability of the joint gasket 1 is reduced. In that regard, in the joint gasket 1 according to this embodiment, before the joint gasket 1 is arranged at the joint M, as shown by reference numeral 1001 in FIG. 1, the design portion 5 and the first foam body 6 are separated by a distance L5. Therefore, the insertability of the joint gasket 1 according to this embodiment is ensured.

[0081] Note that it is not essential that the design portion 5 and the first foam body 6 are separated from each other before the joint gasket 1 is arranged at the joint M. Even if the design portion 5 and the first foam body 6 are in contact with each other in the state before the arrangement, the joint gasket 1 has good insertability ensured, although the degree of the effect is slightly inferior compared to the case where the design portion 5 and the first foam body 6 are separated.

[0082] 〔Modification example〕 Regarding the joint gasket 1 and the seal structure 500 according to this embodiment, a plurality of modified examples are assumed. Hereinafter, with reference to FIG. 3, modified examples of the joint gasket 1 and the seal structure 500 according to this embodiment will be described. As a modified example of the joint gasket 1, for example, a joint gasket 11 as shown in FIG. 3 is assumed.

[0083] As shown by reference numeral 3001 in FIG. 3, the joint gasket 11 includes a column portion 8 having an outdoor side column portion 81 and an indoor side column portion 82. The outdoor side column portion 81 is formed on the outdoor side of the indoor side column portion 82 and is the same part as the column portion 2 of the joint gasket 1 described above. Further, all parts of the joint gasket 11 on the outdoor side of the tip of the outdoor side end of the indoor side column portion 82 (the broken line portion in reference numeral 3001 in FIG. 3) correspond to the joint gasket 1. The column portion 8 is configured such that the indoor side end of the outdoor side column portion 81 (that is, the indoor side end 222 of the column portion 2) and the outdoor side end of the indoor side column portion 82 are continuous and seamless.

[0084] An outdoor side water stop lip 9 is provided on the side surface of the indoor side column portion 82. Also, an indoor side water stop lip 10 is provided at the indoor side end of the indoor side column portion 82. Both the outdoor side water stop lip 9 and the indoor side water stop lip 10 extend toward the two outer wall panels 300. Both the outdoor side water stop lip 9 and the indoor side water stop lip 10 serve to prevent a part of the water that could not be prevented from entering by the hollow lip 4 from further entering the indoor side.

[0085] The outdoor side water stop lip 9 has a root portion 91 protruding from the side surface of the indoor side column portion 82 toward the outer wall panel 300, and a tip portion 92 provided with a second foam body 61 on the tip surface. A bent portion 93 is formed at the connecting portion between the root portion 91 and the tip portion 92. A third recess 73 is formed on the outdoor side surface of this bent portion 93. The outdoor side water stop lip 9 has a shape bent at the bent portion 93, and the tip portion 92 extends obliquely outward from the bent portion 93.

[0086] The indoor-side water stop lip 10 has a base portion 101 protruding from the side surface of the indoor-side column portion 82 toward the outer wall panel 300, and a tip portion 102 provided with a third foam body 62 on the indoor-side surface. A fourth recess 74 is formed on the outdoor-side surface of the connecting portion between the indoor-side column portion 82 and the base portion 101. Further, a bent portion 103 is formed at the connecting portion between the base portion 101 and the tip portion 102. The indoor-side water stop lip 10 has a shape bent at the bent portion 103, and the tip portion 102 extends obliquely inward from the bent portion 103.

[0087] The shapes of the base portion 91 and the tip portion 92 of the outdoor-side water stop lip 9 and the base portion 101 and the tip portion 102 of the indoor-side water stop lip 10 are all substantially plate-shaped. Further, the indoor-side column portion 82, the outdoor-side water stop lip 9, and the indoor-side water stop lip 10 are all formed of a rubber-like elastic body, and it is preferable but not essential that they are made of the same forming material as the portion corresponding to the joint gasket 1, and they may be made of different forming materials. Furthermore, it is preferable but not essential that the forming materials of the second foam body 61 and the third foam body 62 are also the same as the forming material of the first foam body 6, and they may be made of different forming materials.

[0088] In the state where the joint gasket 11 is disposed at the joint M, the arrangement mode of the portion corresponding to the above-described joint gasket 1 is the same as the arrangement mode of the joint gasket 1 as shown by reference numeral 3002 in FIG. 3. Regarding the indoor-side column portion 82, in the state where the joint gasket 11 is disposed at the joint M, it is disposed in the space formed between the two base materials 320 and between the two heat insulating boards 330.

[0089] In the state where the joint gasket 11 is disposed at the joint M, the outdoor-side water stop lip 9 and the indoor-side water stop lip 10 bring the second foam body 61 and the third foam body 62 into surface contact with the outer wall panel 300 as shown by reference numeral 3002 in FIG. 3. Specifically, regarding the outdoor-side water stop lip 9, the second foam body 61 provided on the tip surface of the tip portion 92 is in surface contact with the back surface 313 of the facing material 310. Regarding the indoor-side water stop lip 10, the third foam body 62 provided on the indoor-side surface of the tip portion 102 is in surface contact with the outdoor-side surface 331 of the heat insulating board 330.

[0090] In the state where the joint gasket 11 is disposed at the joint M, as indicated by reference numeral 3002 in FIG. 3, a seal structure 510 of the joint M having the joint gasket 11 and the two outer wall panels 300 as essential components is established.

[0091] 〔Supplementary Notes〕 The present invention is not limited to the above-described embodiments and modified examples, and various modifications are possible within the scope indicated in the claims. Embodiments obtained by appropriately combining the technical means disclosed in each of the embodiments and modified examples are also included in the technical scope of the present invention.

[0092] 〔Examples〕 Hereinafter, with reference to FIGS. 4 to 11, the results of evaluating the performance of the seal structures 520, 500, and 540 of the joint M according to the first to third embodiments of the present invention, and the seal structures 600, 610, 700, 800, and 810 of the joint M according to the first to fifth comparative examples of the present invention will be described. In the following description, "the seal structure of the joint M ···" may be abbreviated as "the seal structure ···".

[0093] When evaluating the performance of each of the examples and comparative examples, four evaluation items, namely "water stoppage property", "retention property", "insertability", and "appearance", were set. The "retention property" refers to the degree to which the arrangement position of the joint gasket disposed at the joint M is difficult to be displaced even by an external force and the passage of time. The performance was evaluated as follows. First, for each of the four evaluation items, the performance was subjectively evaluated in four levels: "very good", "good", "ordinary", and "poor". Next, a comprehensive evaluation considering the evaluation results of the four evaluation items was shown in the above four levels, and this comprehensive evaluation was used as the final evaluation result of the performance in each of the examples and comparative examples.

[0094] As shown in FIGS. 4 to 6, for all of the seal structures 520, 500, and 540 according to the first to third embodiments, the joint gasket 1 according to the present embodiment and the two outer wall panels 300 are essential components. In the seal structure 520 according to the first embodiment, as shown in FIG. 4, the joint width of the joint M is set to the narrow width W1. Also, in the seal structure 500 according to the second embodiment, as shown in FIG. 5, the joint width of the joint M is set to the central width W2. Further, in the seal structure 540 according to the third embodiment, as shown in FIG. 6, the joint width of the joint M is set to the wide width W3. Here, the length of the central width W2 is defined as the design joint width (median value). Also, the length of the narrow width W1 is defined as the lower limit value of the tolerance of the design joint width. Further, the length of the wide width W3 is defined as the upper limit value of the tolerance of the design joint width.

[0095] <Example 1> First, the performances of the seal structure 520 according to the first embodiment were compared with the performances of the seal structure 600 according to the first comparative example and the seal structure 800 according to the fourth comparative example. For the seal structure 600, as shown in FIG. 7, the joint gasket 230 according to Patent Document 1 and the two outer wall panels 300 are essential components, and the joint width of the joint M is set to the narrow width W1'. Also, for the seal structure 800, as shown in FIG. 10, the joint gasket 270 according to Patent Document 3 and the two outer wall panels 300 are essential components, and the joint width of the joint M is set to the narrow width W1'. Here, the length of the narrow width W1' is defined as the lower limit value of the tolerance of the design joint width, similar to the length of the narrow width W1. Also, the length of the narrow width W1 in the first embodiment was made the same as the length of the narrow width W1' in the first comparative example and the fourth comparative example. Further, for the joint gasket 230 and the joint gasket 270, the overall size was made approximately the same as that of the joint gasket 1, and the forming material of all parts in the joint gasket 230 and the joint gasket 270 was made the same as the corresponding parts in the joint gasket 1.

[0096] Regarding water tightness, it was found that the seal structure 520 is very good, the seal structure 600 is ordinary, and the seal structure 800 is good. In the seal structure 520, as shown in FIG. 4, a water-conducting space S1 was formed in a state where the joint gasket 1 was arranged in the joint M with a narrow width W1. In the seal structure 520, the design part 5 and the first foam 6 are strongly adhered to the side surface 312 of the outer wall panel 300, and the water-conducting space S1 has a small volume such that water cannot pass through, that is, the water tightness can be evaluated as very good. Therefore, it was found that the seal structure 520 has very good water tightness.

[0097] On the other hand, in the seal structure 600, as shown in FIG. 7, a water-conducting space S1' was formed in a state where the joint gasket 230 was arranged in the joint M with a narrow width W1'. However, since the joint gasket 230 does not have a member corresponding to the first foam 6, the contact area between the hollow lip 234, the outdoor side water stop lip 237, the indoor side water stop lip 239 and the side surface 312 of the outer wall panel 300 is small, and the degree of adhesion to the side surface 312 is lower than that of the joint gasket 1. Therefore, it was found that the seal structure 600 has ordinary water tightness.

[0098] Also, in the seal structure 800, as shown in FIG. 10, a water-conducting space S1'' was formed in a state where the joint gasket 270 was arranged in the joint M with a narrow width W1'. The volume of the water-conducting space S1'' was equivalent to that of the water-conducting space S1. However, since the joint gasket 270 does not have a member corresponding to the first foam, the degree of adhesion between the hollow lip 284 in which the design part 285 is formed and the side surface 312 of the outer wall panel 300 is lower than that of the joint gasket 1. Therefore, it was found that the seal structure 810 has good water tightness.

[0099] Regarding the retention property, it was found that the seal structure 520 is very good, and the seal structures 600 and 800 are good. In the seal structure 520, since the joint gasket 1 includes the first foam 6, when the joint gasket 1 is arranged in the joint M with a narrow width W1, the first foam 6 closely adheres to the side surface 312 of the outer wall panel 300. Therefore, it was found that the seal structure 520 has very good retention property.

[0100] On the other hand, the evaluation of the seal structures 600 and 800 is lower than that of the seal structure 520. It is presumed that the reason is that the joint gaskets 230 and 270 do not have a member corresponding to the first foam 6, so the degree of adhesion to the side surface 312 of the outer wall panel 300 is lower than that of the joint gasket 1.

[0101] Regarding the insertability, there is almost no difference between the seal structure 520 and the seal structure 600, and it was found that the seal structure 800 is defective. The insertability of the seal structure 520 is normal because when inserted, frictional resistance occurs between the first foam 6 and the side surface 312 of the outer wall panel 300. However, since the joint gasket 1 is inserted into the joint M so as to bend at the first recess 71 and the second recess 72, the posture when inserting the joint gasket 1 into the joint M with a narrow width W1 is stable, and one of the reasons is that the frictional resistance is reduced.

[0102] On the other hand, the evaluation of the seal structure 600 is at the same level as that of the seal structure 520. The reason is that the joint gasket 230 does not have a member corresponding to the first foam 6, so frictional resistance caused by the first foam 6 does not occur. However, since the column portion 232 and the head portion 233 of the hollow lip 234 covering the column portion 232 from the outdoor side are separated, it is difficult to apply force from the outdoor side during insertion, and it is presumed that the reason is that the joint gasket 230 is difficult to insert into the joint.

[0103] In addition, the reason why the evaluation of the seal structure 800 was lower than that of the seal structure 520 is presumably that the top joint member 280 of the joint gasket 270 does not have a member corresponding to the first recess 71 and the second recess 72, so the hollow lip 284 does not bend, and one of the factors is that the frictional resistance between the design part 285, which is a silicon-based coating layer, and the side surface 312 is large.

[0104] Regarding the appearance, it was found that while the seal structures 520 and 800 are defective, the seal structure 600 is good. The seal structure 600 was evaluated higher than the seal structures 520 and 800 because the width of the head 233 of the joint gasket 230 was smaller than that of the head 3 of the joint gasket 1, and since the column part 232 and the head 233 of the hollow lip 234 covering the column part 232 from the outdoor side are separated, the head 233 is not pulled by the column part 232 (not restricted in the bending form), and when the joint gasket 230 is arranged in the joint M with the narrow width W1', the amount and degree of bending of the head 233 are small. This is presumably the factor.

[0105] From the above, when comparing the seal structure 520 with the seal structures 600 and 800, the seal structure 600 has normal water-stopping performance and insertability, and the seal structure 800 has poor insertability and appearance, resulting in low evaluation. On the other hand, the seal structure 520 has poor appearance, but its water-stopping performance and retention performance are very good.

[0106] <Example 2> Next, each performance of the seal structure 500 according to the second embodiment was compared with each performance of the seal structure 610 according to the second comparative example and the seal structure 700 according to the third comparative example. For the seal structure 610, as shown in FIG. 8, the joint gasket 230 according to Patent Document 1 and the two outer wall panels 300 were used as essential components, and the joint width of the joint M was set to the central width W2'. Further, for the seal structure 700, as shown in FIG. 9, the joint gasket 250 according to Patent Document 2 and the two outer wall panels 300 were used as essential components, and the joint width of the joint M was set to the central width W2'. Here, the length of the central width W2' is defined as the designed joint width (median value), similar to the length of the central width W2. Also, the length of the central width W2 of the second embodiment was made the same as the length of the central width W2' of the second and third comparative examples. Furthermore, for the joint gasket 230 and the joint gasket 250, the overall size was made approximately the same as that of the joint gasket 1, and the forming material of all parts in the joint gasket 230 and the joint gasket 250 was made the same as the forming material of the corresponding parts in the joint gasket 1.

[0107] Regarding water tightness, it was found that the seal structure 500 was good, the seal structure 610 was poor, and the seal structure 700 was very good. In the seal structure 500, as shown in FIG. 5, the water conduction space S2 was formed in a state where the joint gasket 1 was disposed in the joint M having the central width W2. In the seal structure 500, the design part 5 and the first foam 6 were in close contact with the side surface 312 of the outer wall panel 300, and the water conduction space S2 had a small volume such that water could hardly pass through, that is, the water tightness could be evaluated as good. Therefore, it was found that the seal structure 500 had good water tightness.

[0108] On the other hand, in the seal structure 610, as shown in FIG. 8, a water conduction space S2' was formed in a state where the joint gasket 230 was disposed at the joint M having the central width W2'. The volume of the water conduction space S2' is larger than that of the water conduction space S2. Moreover, since the joint gasket 230 does not have a member corresponding to the first foam 6, the contact areas of the hollow lip 234, the outdoor side water stop lip 237, and the indoor side water stop lip 239 with the side surface 312 of the outer wall panel 300 are small and the adhesion is low. Therefore, it was found that the seal structure 610 has poor water stopping performance.

[0109] Also, in the seal structure 700, as shown in FIG. 9, no water conduction space was formed in a state where the joint gasket 250 was disposed at the joint M having the central width W2'. Moreover, the contact area between the foam 256 and the side surface 312 of the outer wall panel 300 is large and the adhesion is high. Therefore, it was found that the seal structure 700 is superior in water stopping performance to the seal structure 500 and has very good water stopping performance.

[0110] Regarding the retention, it was found that the seal structure 500 is good, the seal structure 610 is ordinary, and the seal structure 700 is very good. The reason why the evaluation of the seal structure 500 is lower than that of the seal structure 700 is presumably because, as shown in FIG. 1, a space surrounded by the column portion 2, the head portion 3, and the hollow lip 4 is formed in the joint gasket 1 before being disposed at the joint M of the joint gasket 1. That is, although the space after the arrangement is smaller than the space before the arrangement as shown in FIG. 5 due to the formation of the space, the space has not disappeared, so the adhesion between the design portion 5 and the first foam 6 and the side surface 312 of the outer wall panel 300 after the arrangement is inferior to that of the joint gasket 250.

[0111] On the other hand, regarding the joint gasket 250, as shown in FIG. 9, the foam 256 is filled in substantially the entire space between the head portion 253 provided on the column portion 252, the outdoor side water stop lip 257, and the indoor side water stop lip 259, and no space like the joint gasket 1 is formed. This is presumably the reason for the high retention of the seal structure 700.

[0112] Also, the reason why the sealing structure 610 was evaluated lower than the sealing structure 500 is presumably that the contact area between the joint gasket 230 and the side surface 312 of the outer wall panel 300 was small and the adhesion was low.

[0113] Regarding the insertability, it was found that the sealing structure 500 was good, the sealing structure 610 was normal, and the sealing structure 700 was poor. The reason why the insertability of the sealing structure 500 became good is presumably that since the joint gasket 1 is inserted into the joint M so as to bend at the first recess 71 and the second recess 72, the first wall portion 41 becomes substantially parallel to the side surface 312 of the outer wall panel 300, and the posture of the joint gasket 1 at the time of insertion is stable.

[0114] On the other hand, the reason why the insertability of the sealing structure 610 became normal is presumably that since the column portion 232 and the head portion 233 of the hollow lip 234 provided on the outdoor side of the column portion 232 are separated from each other, it is difficult to apply force from the outdoor side during insertion, and it is difficult to insert the joint gasket 230 into the joint.

[0115] Also, the reason why the insertability of the sealing structure 700 became poor is presumably that since the foam 256 is filled in substantially the entire area of the space surrounded by the head portion 253, the outdoor side water stop lip 257, and the indoor side water stop lip 259, the degree of freedom of deformation is extremely low.

[0116] Regarding the appearance, while the seal structure 500 is very good, the seal structure 610 is good, and it has been found that the seal structure 700 is poor. The reason why the appearance of the seal structure 500 is very good is that the joint gasket 1 is arranged at the joint M in a state of being bent at the first recess 71, so the amount and degree of the head 3 curving concavely toward the indoor side are small, suppressing the curvature of the head 3, and it is speculated that one of the factors is that the joint gasket 1 is arranged at the joint M with the head 3 being in a state close to flat. In addition, since the protrusion 51 is formed in the design part 5, it is also speculated that one of the factors is that the gap between the outdoor side surface of the head 3 and the side surface 312 of the outer wall panel 300 becomes small, making it difficult for a shadow to occur.

[0117] On the other hand, the reason why the appearance of the seal structure 610 is good is that the column part 232 and the head 233 of the hollow lip 234 covering the column part 232 from the outdoor side are separated, so the head 233 is not pulled by the column part 232 (not restricted in the bending form). Although the amount and degree of the head 233 curving are small in the state where the joint gasket 230 is arranged at the joint M with a central width W2', there are no members corresponding to the first recess 71 and the protrusion 51 formed at the connecting part between the head 233 and the hollow lip 234, and the gap between the hollow lip 234 and the side surface 312 of the outer wall panel 300 when viewed from the outdoor side becomes large, which is speculated to be the factor causing the shadow. Also, the reason why the appearance of the seal structure 700 is poor is that since the head 253 is plate-shaped, it is speculated that the factor is that the head 253 is likely to curve concavely toward the indoor side in the state of being arranged at the joint M.

[0118] From the above, when comparing the seal structure 500, the seal structure 610, and the seal structure 700, the seal structure 610 has poor water tightness and is rated low, and the seal structure 700 has poor insertability and appearance and is rated low. On the other hand, the seal structure 500 has evaluations above good in terms of water tightness, retention, insertability, and appearance, and has received a highly balanced and high evaluation.

[0119] <Example 3> Next, each performance of the seal structure 540 according to the third embodiment was compared with each performance of the seal structure 810 according to the fifth comparative example. For the seal structure 810, as shown in FIG. 11, the joint gasket 270 according to Patent Document 3 and the outer wall panel 300 were used as essential components, and the joint width of the joint M was set to a wide width W3'. Here, the length of the wide width W3' is defined as the upper limit value of the tolerance of the designed joint width, similar to the length of the wide width W3. Also, the length of the wide width W3 in the third embodiment was made the same as the length of the wide width W3' in the third comparative example.

[0120] Regarding water tightness, it was found that the seal structure 540 was normal and the seal structure 810 was defective. In the seal structure 540, as shown in FIG. 6, when the joint gasket 1 was disposed in the joint M of the wide width W3, the water conduction space S3 was formed. In the seal structure 540, the design portion 5 and the first foam 6 were in contact with the side surface 312 of the outer wall panel 300 to some extent, and the water conduction space S1 had a small volume such that the water tightness could be evaluated as normal. Therefore, it was found that the seal structure 540 had normal water tightness. The reason why the water tightness of the seal structure 540 became normal was that the followability of the first foam 6 provided on the hollow lip 4 was high, so that surface contact could be ensured between the first foam 6 and the side surface 312 of the outer wall panel 300, and even though the joint M was the wide width W3, the volume of the water conduction space S3 did not become too large due to the presence of the first foam 6.

[0121] On the other hand, in the seal structure 810, as shown in FIG. 11, when the joint gasket 270 was disposed in the joint M of the wide width W3', the water conduction space S3' was formed. Here, the volume of the water conduction space S3' was larger than that of the water conduction space S3, and since the joint gasket 270 did not have a member corresponding to the first foam 6, it is presumed that the contact area between the hollow lip 284 in which the design portion 285 was formed and the side surface 312 of the outer wall panel 300 was small and the adhesion degree was low.

[0122] Regarding the retention property, there was almost no difference between the seal structure 540 and the seal structure 810, and both were found to be normal. Such a result was obtained because the joint gasket 1 has the highly followable first foam 6, while the joint gasket 270 is locked to the vertical plate 291 of the base joint material 290 that is clamped and fixed between the indoor side surface of the facing material 310 of the outer wall panel 300 and the outdoor side surface of the heat insulation board 330. It is speculated that this is due to the fact that the joint gasket 270 has a ridge (buttocks-like portion) 288.

[0123] Regarding the insertability, it was found that the seal structure 540 is very good and the seal structure 810 is good. The insertability of the seal structure 540 became very good because the joint gasket 1 is inserted into the joint M so as to bend at the first recess 71 and the second recess 72. As a result, the first wall portion 41 becomes substantially parallel to the side surface 312 of the outer wall panel 300, the posture of the joint gasket 1 at the time of insertion is stabilized, and the joint width is the wide width W3. It is speculated that these are the reasons.

[0124] On the other hand, the insertability of the seal structure 810 became normal because the joint width is the wide width W3, so the amount of deflection of the hollow lip 284 is small, and the frictional resistance between the design portion 285, which is a silicon-based coating layer provided on the outdoor side of the hollow lip 284 of the joint gasket 270, and the side surface 312 is small. It is speculated that this is the reason.

[0125] Regarding the appearance, it was found that the seal structure 540 is good while the seal structure 810 is normal. The appearance of the seal structure 540 became good because the joint gasket 1 is arranged at the joint M in a state of being bent at the first recess 71. Therefore, the amount and degree of the head 3 being curved concavely toward the indoor side are small, the curvature of the head 3 is suppressed, and the joint gasket 1 is arranged at the joint M in a state where the head 3 is close to being flat. This is speculated to be one of the reasons. In addition, since the protrusion 51 is formed on the design portion 5, the gap between the outdoor side surface of the head 3 and the side surface 312 of the outer wall panel 300 becomes slightly smaller, and it is speculated that this is also one of the reasons that it is difficult for a shadow to occur.

[0126] On the other hand, it is presumed that the appearance of the seal structure 810 became ordinary because members corresponding to the first recess 71 and the protrusion 51 were not formed at the connecting portion between the head 283 of the column portion 282 and the hollow lip 234, and the gap between the hollow lip 234 and the side surface 312 of the outer wall panel 300 with the wide width W3' became large when viewed from the outdoor side, resulting in the formation of a shadow.

[0127] When comparing the seal structure 540 and the seal structure 810, the evaluation of the water-stopping property of the seal structure 810 is poor and low, while the seal structure 540 has no indicators for poor evaluation and has obtained a well-balanced evaluation.

[0128] <Overall Evaluation>

[0129]

Table 1

[0130] On the other hand, for the joint gasket 230, the evaluation of the appearance was relatively high, but the evaluation of the water-stopping property was relatively low. Therefore, it was found that the overall evaluation of the joint gasket 230 for water-stopping property, retention, insertability, and appearance was ordinary. Also, for the joint gasket 250, the evaluations of the water-stopping property and retention were relatively high, but the evaluations of the insertability and appearance were relatively low. Therefore, it was found that the overall evaluation of the joint gasket 250 for water-stopping property, retention, insertability, and appearance was poor. Furthermore, for the joint gasket 270, the evaluations of the water-stopping property and retention were relatively high, but the evaluations of the insertability and appearance were relatively low. Therefore, it was found that the overall evaluation of the joint gasket 270 for water-stopping property, retention, insertability, and appearance was ordinary.

Explanation of Reference Numerals

[0131] 1. Gasket for the purpose of 11 2. Column part of 8 3. Head part 4. Hollow lip (lip) 5. Design part 6. First foam (foam) 21. First column part 22. Second column part 31. Lateral end part 41. First wall part 42. Second wall part 43. Third wall part 51. Protrusion 71. First concave part 72. Second concave part 81. Outdoor side column part 82. Indoor side column part 211. Outdoor side end part 212. Column base part 221. Bulging part 222. Indoor side end part 300. Outer wall panel 330. Heat insulation board 500, 510, 520, 540. Seal structure L1 to L4. Maximum width L5. Spacing M. Purpose P1. Indoor end of the design part P2. Outdoor end of the foam P3. Indoor end of the foam T1. Width of the first column part T2. Width of the second column part W, W1 to W3. Purpose width θ, θ1, θ2. Angle

Claims

1. A joint gasket disposed at a joint formed between two adjacent outer wall panels, comprising: a column portion extending along the extending direction of the joint; a head portion connected to the outdoor-side end of the column portion, each of the side end portions facing the side surfaces of the two outer wall panels extending toward the side surfaces; a lip extending from the side end portion and connected to the column portion on the indoor side of the outdoor-side end; a design portion covering the head portion and a part of the lip from the outdoor side; a foam provided on the surface of the lip facing the side surface, with a space from the design portion; a first recess is formed on the indoor-side surface of the connecting portion between the side end portion and the lip; the lip comprises: a first wall portion extending obliquely inward from the side end portion toward the side surface; a second wall portion bent from the first wall portion and extending inward; the design portion is provided across the first wall portion and the second wall portion; a joint gasket, wherein, in a state before the joint gasket is disposed at the joint, an angle formed between the side-surface side surface of the design portion provided on the second wall portion and the outdoor-side surface of the foam is an acute angle.

2. The joint gasket according to claim 1, wherein a protrusion is formed on the outdoor side near the connecting portion between the side end portion and the lip.

3. A joint gasket disposed at a joint formed between two adjacent outer wall panels, comprising: a column portion extending along the extending direction of the joint; a head portion connected to the outdoor-side end of the column portion, each of the side end portions facing the side surfaces of the two outer wall panels extending toward the side surfaces; a lip extending from the side end portion and connected to the column portion on the indoor side of the outdoor-side end; a design portion covering the head portion and a part of the lip from the outdoor side; a foam provided on the surface of the lip facing the side surface, with a space from the design portion; a protrusion is formed on the outdoor side near the connecting portion between the side end portion and the lip; the lip comprises: a first wall portion extending obliquely inward from the side end portion toward the side surface; a second wall portion bent from the first wall portion and extending inward; the design portion is provided across the first wall portion and the second wall portion; a joint gasket, wherein, in a state before the joint gasket is disposed at the joint, an angle formed between the side-surface side surface of the design portion provided on the second wall portion and the outdoor-side surface of the foam is an acute angle.

4. The joint gasket according to claim 3, wherein a first recess is formed on the indoor side surface of the connecting portion between the side end portion and the lip.

5. In a state where the joint gasket is disposed at the joint, each of the design portion and the foam is in surface contact with the side surface, and the joint gasket according to claim 2 or 4, wherein the angle is smaller than in a state before the joint gasket is disposed at the joint.

6. The lip bends from the second wall portion, extends obliquely inward toward the column portion, and further includes a third wall portion connected to the column portion, and the joint gasket according to claim 5, wherein the foam is provided across the second wall portion and the third wall portion.

7. The joint gasket according to claim 6, wherein a second recess is formed on the surface of the connecting portion between the first wall portion and the second wall portion on the column portion side.

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