Backer and joint structure

Abstract

To provide a backer which is superior in water-tightness and drainage property.SOLUTION: A backer 1 supports a sealing material 6 placed at a joint 5 formed between two mutually adjacent panels P1 and P2. The backer 1 is a columnar body which has a length direction in the direction in which the joint 5 extends. The columnar body has two contact parts 10 and 10 which contact the two panels P1 and P2 respectively and a drain channel formation part 11 which forms a drain channel on the opposite side of the sealing material 6. In a section orthogonal to the length direction of the columnar body, the contact parts 10 and 10 are arcuate to be convex toward the panels P1 and P2, and the drain channel formation part 11 is concave.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a backer and a joint structure, and more particularly to a backer that supports a sealant placed in a joint formed between two adjacent panels and a joint structure using the same. [Background technology]

[0002] When an irregular sealant is placed in the joint between two adjacent panels, a backer (back-up material) is provided in the joint to support the sealant. Such a backer is usually columnar with a square or circular cross section.

[0003] Such a backer is required to have excellent watertightness, making it difficult for rainwater to pass between the panel and the backer, so that it can prevent rainwater from entering the building through gaps between the sealant and the panel from the joints. In addition, the backer is required to have not only excellent watertightness, but also excellent drainage, so that even if rainwater does enter through gaps between the panel and the backer, the infiltrated rainwater can be smoothly discharged to the outside of the panel.

[0004] Patent Document 1 discloses a backup material in which the upper surface of a rectangular tubular body made of soft synthetic resin is formed into a concave arc-shaped cross section, and both sides of the upper surface of the rectangular tubular body are formed into horn-shaped protrusions. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 6-8510 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the backup material described in Patent Document 1, the side that comes into contact with the panel has a horn-like shape, so its watertightness is still insufficient and its drainage function is also thought to be low.

[0007] An object of the present invention is to provide a backer that is excellent in both watertightness and drainage properties, and a joint structure using the same. [Means for solving the problem]

[0008] A backer according to one embodiment of the present disclosure is a backer that supports a sealant to be placed in a joint formed between two adjacent panels, and is a columnar body whose longitudinal direction is the direction in which the joint extends, the columnar body having two contact portions that contact each of the two panels and a drainage channel forming portion that forms a drainage channel on the opposite side of the sealant, and is characterized in that in a cross section of the columnar body in a direction perpendicular to the longitudinal direction, the contact portions are arc-shaped convex toward the panel, and the drainage channel forming portion is concave.

[0009] A backer according to another embodiment of the present disclosure is a backer that supports a sealant to be placed in a joint formed between two adjacent panels, the backer being a columnar body held by a retaining member that is placed in the joint and whose longitudinal direction is the direction in which the joint extends, the columnar body having two contact portions that contact each of the two panels and a first drainage channel forming portion that forms a drainage channel on the opposite side of the sealant, the retaining member having a second drainage channel forming portion on the first drainage channel forming portion side that forms a drainage channel, and in a cross section of the columnar body in a direction perpendicular to the longitudinal direction, the contact portions have a shape that is convex toward the panel, and the second drainage channel forming portion of the retaining member is concave.

[0010] A joint structure according to one embodiment of the present disclosure comprises two adjacent panels, a sealant placed in a joint formed between the two panels, and a backer placed deeper into the joint than the sealant. Effect of the Invention

[0011] According to the present disclosure, it is possible to provide a backer that is excellent in both watertightness and drainage properties, and a joint structure that uses the same. [Brief description of the drawings]

[0012] [Figure 1] Fig. 1A is a perspective view showing an example of a backer according to a first embodiment of the present disclosure, and Fig. 1B is a perspective view showing another example of the backer according to the same embodiment. [Diagram 2] 2A1 and 2A2 are horizontal cross-sectional views showing an example of the joint structure of this embodiment, and Fig. 2B is a side cross-sectional view showing another example of the joint structure of this embodiment. [Diagram 3] Fig. 3A is a perspective view showing an example of a backer according to a second embodiment of the present disclosure, and Fig. 3B is a perspective view showing another example of the backer according to the same embodiment. [Figure 4] 4A and 4B are perspective views showing an example of a panel that constitutes the above joint structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] <Backer> The backer 1 of the present embodiment is for supporting a sealant placed in a joint formed between two adjacent panels, that is, it is a backup material.

[0014] [First embodiment] The backer 1 of the first embodiment is a columnar body whose longitudinal direction is the direction in which the joints extend. The columnar body has two contact parts 10, 10 that contact each of the two panels, and a drainage channel forming part 11 that forms a drainage channel on the opposite side of the sealant. In a cross section perpendicular to the longitudinal direction of the columnar body, the contact part 10 is an arc shape that is convex toward the panel, and the drainage channel forming part 11 is concave.

[0015] The term "arc-shaped" refers not only to the arc shape of a perfect circle, but also to the arc shapes of ovals such as an ellipse, an oval, a rounded rectangle, and an egg. In cross section, "concave" refers to a shape that is concave toward the inside of the backer 1.

[0016] An example of the backer 1 of the first embodiment is shown in FIG. 1A and FIG. 1B. The backer 1 of FIG. 1A and FIG. 1B has a cross-sectional shape in a direction perpendicular to the longitudinal direction, which is a glasses-shaped shape. The "glasses-shaped shape" means the outer peripheral shape of two identical circles overlapping each other with a common chord. The concept of "circular shape" includes not only perfect circles, but also oval shapes such as ellipses, rounded rectangles, and egg shapes. The cross-sectional shape of the backer 1 of FIG. 1A is a shape in which two perfect circles are overlapped, and the cross-sectional shape of the backer 1 of FIG. 1B is a shape in which two ovals are overlapped. In the outer peripheral shape of the overlapped shapes, the angular parts may be rounded. By making the cross-sectional shape of the backer 1 a glasses-shaped shape, the backer 1 has a shape that is symmetrical left and right and vertically symmetrical, and the force at the contact points between the two contact parts 10, 10 and the two panels P1, P2 is applied perpendicularly and evenly to the surfaces of the two panels P1, P2. Therefore, the watertightness of the backer 1 can be further improved.

[0017] Details of Backer 1 will be described later in the section on [Backer] in the joint structure.

[0018] <Joint structure> A joint structure 100 using the backer 1 of this embodiment includes two adjacent panels P1, P2, a sealant 6 disposed in a joint 5 formed between the two panels P1, P2, and a backer 1 disposed on the back side of the joint 5 relative to the sealant 6. The joint structure 100 of Figs. 2A and 2B further includes a retaining member 7 disposed on the back side of the joint 5 relative to the backer 1.

[0019] An example of the joint structure 100 of this embodiment is shown in Figures 2A1, 2A2, and 2B. The joint structure 100 in Figures 2A1 and 2A2 uses the backer 1 in Figure 1A for the vertical joint 50, and the joint structure 100 in Figure 2B uses the backer 1 in Figure 1B for the horizontal joint 51.

[0020] According to the backer 1 and joint structure 100 of this embodiment, as shown in Figures 2A1, 2A2, and 2B, the two contact parts 10, 10 of the backer 1 are arc-shaped in cross section, so that the backer 1 contacts the panels P1, P2 at one place, each of which has a smaller area. Therefore, as shown by the water-stopping line T, the formation of gaps between the two contact parts 10, 10 and the panels P1, P2 is suppressed, and the infiltration of rainwater, etc. due to capillary action, etc. is suppressed, so that the backer 1 has excellent watertightness. In addition, two drainage channels S1, S2 are formed on the back side of the joint from the contact parts between the two contact parts 10, 10 and the panels P1, P2, and in addition, the backer 1 has a drainage channel forming part 11 on the opposite side to the sealant 6, and this drainage channel forming part 11 is concave in cross section, so that a drainage channel S3 is further formed. The three drainage channels S1, S2, and S3 formed further back into the joint 5 than the water stop line T allow rainwater, etc., to pass through the three drainage channels S1, S2, and S3 and fall to the lowest level where the drainage pipe is located, even if the rainwater, etc., seeps in through the drainage pipe and can be discharged to the outdoor side of the panels P1 and P2, making the backer 1 excellent in drainage properties.

[0021] The two panels P1, P2, the sealant 6, the backer 1, and the retaining member 7 that constitute the joint structure 100 will be described below.

[0022] [panel] The two panels P1 and P2 are sandwich panels of the same structure. The following describes one of the two panels, panel P1.

[0023] An example of a panel P1 is shown in Figures 4A and 4B. The panel P1 comprises a core material 2, a metal skin 3 covering the core material 2 from the front side, and a metal skin 4 covering the core material 2 from the rear side. The panel P1 is a building panel and is used, for example, as an exterior wall material. When the panel P1 is used as an exterior wall material, the metal skin 3 forms the outdoor surface of the panel P1, and the metal skin 4 forms the indoor surface of the panel P1.

[0024] The panel P1 is a rectangular plate. The panel P1 has a longitudinal direction parallel to the up-down direction, a lateral direction parallel to the left-right direction, and a thickness direction parallel to the front-rear direction. The panel P1 has, for example, a length in the up-down direction of 0.5 to 6.0 m, a length (width) in the left-right direction of 0.2 to 1.5 m, and a length (thickness) in the front-rear direction of 50 to 150 mm.

[0025] (Core material) The core material 2 has an overall shape of a rectangular plate. The term "overall shape being plate-like" does not necessarily mean a single plate, but also includes a plurality of members arranged to form a single plate.

[0026] The core material 2 is made of a fibrous inorganic material such as rock wool or glass wool. The core material 2 has heat insulating properties. The core material 2 is made of a plurality of blocks arranged in the left-right direction. Each of the plurality of blocks is made by solidifying a fibrous inorganic material into a block shape with a binder or the like. The longitudinal direction of the fibrous inorganic material of each of the plurality of blocks is aligned along the front-rear direction.

[0027] (metal shell) Each of the metal skins 3 and 4 is obtained by forming a metal plate into a desired shape by rolling, pressing, etc. The metal plate has a thickness of, for example, 0.25 to 2.0 mm. The metal plate may be, but is not limited to, a painted steel plate, a zinc-plated steel plate, an aluminum-zinc alloy-plated steel plate, a Galvalume steel plate (registered trademark), an SGL (registered trademark) steel plate, etc.

[0028] The metal skins 3 and 4 will be described in the case of the panel P1 in Fig. 4A. The metal skin 3 is a rectangular box-like shape that opens toward the rear. The metal skin 3 has a rectangular plate-like main body 30 that covers the front surface 204 of the core material 2, an upper wall 31 that covers the upper surface 200 of the core material 2, a lower wall 32 that covers the lower surface 201 of the core material 2, a left side wall 33 that covers the left side surface 202 of the core material 2, and a right side wall 34 that covers the right side surface 203 of the core material 2.

[0029] The upper wall 31 protrudes rearward from the upper edge of the main body 30, the lower wall 32 protrudes rearward from the lower edge of the main body 30, the left side wall 33 protrudes rearward from the left edge of the main body 30, and the right side wall 34 protrudes rearward from the right edge of the main body 30. Each of the four walls 31, 32, 33, 34 is perpendicular to the main body 30. Each of the upper and lower walls 31, 32 is rectangular flat plate-shaped. The left and right side walls 33, 34 have rectangular flat plate portions 330, 340 and rectangular plate-shaped protrusions 331, 341 protruding from the rear ends of the flat plate portions 330, 340 outward in the left-right direction at approximately right angles. The upper and lower walls 31, 32 are longer in the front-rear direction than the left and right side walls 33, 34.

[0030] Of the four wall portions 31, 32, 33, 34 in the two panels P1, P2, a joint 5 is formed between two adjacent wall portions in the left-right or up-down direction. The joint 5 formed between the left side wall portion 33 of the panel P1 and the right side wall portion 34 of the panel P2 is a vertical joint 50, and the joint 5 formed between the lower wall portion 32 of the panel P1 and the upper wall portion 31 of the panel P2 is a horizontal joint 51.

[0031] The metal skin 4 has a rectangular plate-shaped main body 40 covering the rear surface 205 of the core material 2, a left side wall 41 covering the left side surface 202 of the core material 2, and a right side wall 42 covering the right side surface 203 of the core material 2. The left side wall 41 protrudes forward from the left edge of the main body 40, and the right side wall 42 protrudes forward from the right edge of the main body 40. The metal skin 4 does not have any portion covering the upper surface 200 or the lower surface 201 of the core material.

[0032] The main body portions 30, 40 of the metal skins 3, 4 are bonded to the front and rear surfaces 204, 205 of the core material 2, respectively, and are integrated with the core material 2 to form the panel P1.

[0033] Next, the case of panel P1 in FIG. 4B will be described. A box-folded portion is formed in the metal skin 3, and the box-folded portion is formed with a joint side piece portion 35 bent substantially vertically from the side end portion of the flat portion of the metal skin 3 toward the rear, and a joint bottom piece portion 36 bent substantially vertically from the rear end portion of the joint side piece portion 35 toward the side. The box-folded portion is provided over substantially the entire length of the panel P1 in the vertical direction. In addition, a sealing tape 37 is provided on the joint bottom piece portion 36. The sealing tape 37 is folded and attached so as to cover the front surface of the joint bottom piece portion 36 and a part of the tip surface and rear surface.

[0034] A joint 5 is formed between two side wall portions adjacent to each other in the left-right direction of the two panels P1, P2. That is, a vertical joint 50 is formed between the left side wall portion of the panel P1 and the right side wall portion of the panel P2.

[0035] [Sealing material] The sealant 6 is supported by the backer 1. The sealant 6 is placed in front of the backer 1 in the joint 5 formed between the two panels P1, P2. Specifically, the sealant 6 is formed by placing a retaining member 7 at the innermost side of the joint 5, placing the backer 1 in front of it, and then filling the material of the sealant 6 in front of the backer 1.

[0036] The material for forming the sealant 6 may be a suitable resin material such as modified silicone, silicone, polysulfide, polyisobutylene, or the like.

[0037] [Backer] The backer 1 is disposed on the inner side of the joint 5 relative to the sealing material 6. Specifically, after the retaining member 7 is disposed on the innermost side of the joint 5, the backer 1 is disposed in front of it.

[0038] The backer 1 is a columnar body whose longitudinal direction is the direction in which the joints 5 extend. The term "columnar body" refers to a solid body obtained by translating a certain planar figure along a straight line perpendicular to the planar figure. However, the diameter of the columnar body may or may not be constant in the axial direction. The columnar body may also be a cylindrical body having a cavity inside.

[0039] The columnar body constituting the backer 1 has two contact portions 10, 10 and a drainage channel forming portion 11.

[0040] (Contact part) The two contact portions 10, 10 are portions that come into contact with each of the two panels P1, P2 when the backer 1 is placed in the joint 5. The two contact portions 10, 10 are portions of the backer 1 that normally face the two panels P1, P2.

[0041] The two contact portions 10, 10 have an arc shape that protrudes toward the panel in a cross section perpendicular to the longitudinal direction of the columnar body.

[0042] Since the two contact parts 10, 10 of the backer 1 are arc-shaped in cross section, the backer 1 contacts the panels P1, P2 at one location each, which is a smaller contact part. As a result, as shown by the water-stopping line T, the formation of gaps between the two contact parts 10, 10 and the panels P1, P2 is suppressed, and the infiltration of rainwater, etc. due to capillary action, etc. is suppressed, so that the backer 1 has excellent watertightness. In addition, two drainage channels S1, S2 are formed on the back side of the joint 5 from the contact parts between the two contact parts 10, 10 and the panels P1, P2.

[0043] (Drainage channel forming part) The drainage channel forming portion 11 is a portion that is on the opposite side of the sealing material 6 when the backer 1 is placed in the joint 5. The drainage channel forming portion 11 is a portion of the backer 1 that is usually between the two contact portions 10, 10 and faces the retaining member 7.

[0044] The drainage channel forming portion 11 has a concave shape in a cross section perpendicular to the longitudinal direction of the columnar body. The number of recesses constituting the concave cross section of the drainage channel forming portion 11 may be one or two or more.

[0045] The backer 1 has a drainage channel forming portion 11 on the side opposite the sealing material 6, and this drainage channel forming portion 11 has a concave cross section, so that even if the surface of the retaining member 7 that contacts the backer 1 is flat, a drainage channel S3 is formed in addition to the above-mentioned drainage channels S1 and S2. Even if rainwater or the like infiltrates into the joint 5 from the water stop line T, the three drainage channels S1, S2, and S3 formed on the back side of the joint 5 can pass through these three drainage channels S1, S2, and S3 and fall to the lowest level where the drainage pipe is located, so that the rainwater or the like that infiltrates from this drainage pipe can be discharged to the outdoor side of the panels P1 and P2, and the backer 1 has excellent drainage properties.

[0046] The cross-sectional shape of the backer 1 in a direction perpendicular to the longitudinal direction of the columnar body may be the above-mentioned shape of the two contact parts 10, 10 and the drainage channel forming part 11. Examples of the cross-sectional shape of the backer 1 include a glasses shape, a Daruma shape, and a shape with a recess formed on one side of a rounded rectangle.

[0047] The dimension of the backer 1 in the width direction of the joint 5 is, for example, 1.1 times or more, and preferably 1.3 times or more, the width dimension of the joint 5. In this case, the contact between the backer 1 and the two panels P1, P2 can be more appropriately strengthened, and as a result, the watertightness of the backer 1 can be further improved.

[0048] The backer 1 is preferably made of an elastic material. An "elastic material" refers to a material that can be pressed against the contacting panels P1, P2 by the restoring force from elastic deformation. If the backer 1 is made of an elastic material, the backer 1 can be easily arranged in the joint 5, and the pressing force at the contact points between the contact parts 10, 10 of the backer 1 and the two panels P1, P2 can be more appropriately strengthened, so that the watertightness of the backer 1 can be further improved.

[0049] Examples of the elastic body include synthetic resins or their foams, synthetic rubbers, etc. Examples of the synthetic resins include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyurethane, ethylene-propylene-terpolymer (EPT), etc. Examples of the synthetic rubbers include ethylene-propylene-diene (EPDM) rubber, butyl rubber, chloroprene rubber, styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), silicone rubber, etc. The synthetic resin foams may be closed-cell foams, open-cell foams, or foams containing a mixture of closed and open cells. The expansion ratio is, for example, 10 times or more.

[0050] [Holding material] The retaining member 7 is a member that retains the backer 1. The retaining member 7 is usually placed on the back side of the joint 5 relative to the backer 1, and retains the backer 1 by contacting it. Specifically, the retaining member 7 is placed on the backmost side of the joint 5. The retaining member 7 is usually a columnar or cylindrical body whose longitudinal direction is the extension direction of the joint 5, and is placed in parallel to the backer 1 in the joint 5. An example of the retaining member 7 is a packing.

[0051] The shape of the cross section of the holding member 7 in the direction perpendicular to the longitudinal direction is not particularly limited, but may be, for example, a square shape. The holding member 7 may be provided in a rectangular frame shape in a front view so as to surround the entire periphery of the panels P1, P2. Examples of the material of the holding member 7 include synthetic resin or its foam, synthetic rubber, metal, and wood.

[0052] According to Backer 1, watertightness can be achieved up to 1700 Pa without leakage.

[0053] <Backer> [Second embodiment] The backer 1' of the second embodiment is held by a retaining member 7' arranged in the joint 5. The backer 1' is a columnar body whose longitudinal direction is the direction in which the joint extends. The columnar body has two contact portions 10', 10' that contact each of the two panels, and a first drainage channel forming portion 11' that forms a drainage channel on the opposite side of the sealant 6. The retaining member 7' has a second drainage channel forming portion on the first drainage channel forming portion 11' side that forms a drainage channel. In a cross section perpendicular to the longitudinal direction of the columnar body, the contact portion 10' has a shape that is convex toward the panel, and the second drainage channel forming portion of the retaining member 7' is concave.

[0054] "A shape that is convex toward the panel" means a shape in which the entire side facing the panel is not parallel to the panel and the width of the shape closer to the panel is smaller than that farther from the panel. Examples of convex shapes include an arc shape, a trapezoid shape, a convex shape, a triangular shape, etc. In cross section, "concave" means a shape that is concave toward the inside of the holding member 7.

[0055] An example of the backer 1' of the second embodiment is shown in FIG. 3A and FIG. 3B. The backer 1' in FIG. 3A has a cross-sectional shape in a direction perpendicular to the longitudinal direction that is a chamfered rectangle. A "chamfered rectangle" refers to a shape in which one to four corners of a rectangle such as a square, rectangle, parallelogram, or trapezoid are removed. Examples of the chamfered rectangle include an R-chamfered rectangle and a C-chamfered rectangle. By making the cross-sectional shape of the backer 1' a chamfered rectangle, the backer 1' comes into contact with the two panels P1 and P2 at contact points with a smaller area. Therefore, the watertightness of the backer 1' can be further improved. The backer 1' in FIG. 3B has a cross-sectional shape in a direction perpendicular to the longitudinal direction that is a circle.

[0056] Details of the backer 1' and the retaining member 7' will be described later in the section on [Backer] and [Retaining member] in the joint structure.

[0057] <Joint structure> A joint structure 100' using a backer 1' of the second embodiment comprises two adjacent panels P1, P2, a sealant 6 placed in a joint 5 formed between the two panels P1, P2, a backer 1' placed further back into the joint 5 than the sealant 6, and a retaining member 7' placed further back into the joint 5 than the backer 1'.

[0058] The two panels P1, P2 and the sealant 6 constituting the joint structure 100' are similar to those in the joint structure 100 using the backer 1 of the first embodiment described above.

[0059] [Backer] The backer 1' is placed on the back side of the joint 5 relative to the sealing material 6 and in front of the retaining member 7'. Specifically, after the retaining member 7' is placed at the backmost side of the joint 5, the backer 1' is placed in front of it.

[0060] The backer 1' is a columnar body whose longitudinal direction is the extension direction of the joints 5. The columnar body constituting the backer 1' has two contact portions 10', 10' and a first drainage channel forming portion 11'.

[0061] (Contact part) The two contact portions 10', 10' of the backer 1' have a shape that protrudes toward the panel in a cross section perpendicular to the longitudinal direction of the columnar body.

[0062] The two contact parts 10', 10' of the backer 1' have a convex cross-sectional shape, so that the backer 1' contacts the panels P1, P2 at one point each. As a result, as shown by the water-stopping line T, the formation of gaps between the two contact parts 10', 10' and the panels P1, P2 is suppressed, and the infiltration of rainwater, etc. due to capillary action, etc. is suppressed, so that the backer 1' has excellent watertightness. In addition, two drainage channels S1, S2 are formed on the back side of the joint 5 from the contact points between the two contact parts 10', 10' and the panels P1, P2.

[0063] (First drainage channel forming part) The first drainage channel forming portion 11' is a portion that is on the opposite side of the sealing material 6 when the backer 1' is placed in the joint 5. The first drainage channel forming portion 11' is usually a portion of the backer 1' that is between the two contact portions 10', 10' and faces the retaining member 7'. The shape of the first drainage channel forming portion 11' in a cross section perpendicular to the longitudinal direction of the columnar body is not particularly limited, and may be concave or flat.

[0064] [Holding material] The retaining member 7' is a member that retains the backer 1'. The retaining member 7' is usually placed on the back side of the joint 5 relative to the backer 1', and retains the backer 1' by contacting it. The retaining member 7' is usually a columnar or cylindrical body whose longitudinal direction is the direction in which the joint 5 extends, and is placed in parallel to the backer 1' in the joint 5. An example of the retaining member 7' is a packing. The retaining member 7' may be made of one member, or may be made of a combination of two or more members.

[0065] (Second drainage channel formation part) The retaining member 7' has a second drainage channel forming portion that forms a drainage channel on the side of the first drainage channel forming portion 11' of the backer 1' arranged in front of the joint 5. The second drainage channel forming portion is concave in cross section perpendicular to the longitudinal direction of the columnar body of the backer 1' and the retaining member 7'. In the second drainage channel forming portion, the number of recesses that form the concave cross section may be one or may be two or more. The second drainage channel forming portion having a concave cross section may be formed from two or more retaining members 7'.

[0066] The backer 1' has a second drainage channel forming portion on the first drainage channel forming portion 11' side of the backer 1', and this second drainage channel forming portion has a concave cross section, so that in addition to the above-mentioned drainage channels S1 and S2, a drainage channel S3 is formed. Even if rainwater or the like infiltrates into the joint 5 from the water stop line T, the three drainage channels S1, S2, and S3 formed on the back side of the joint 5 can pass through these three drainage channels S1, S2, and S3 and fall to the lowest level where the drainage pipe is located. Therefore, the rainwater or the like that infiltrates from this drainage pipe can be discharged to the outdoor side of the panels P1 and P2, and the backer 1' has excellent drainage properties.

[0067] Examples of the retaining member 7' that provides the second drainage channel forming portion with a concave cross-section include a single gasket having a concave cross-section, two gaskets with chamfered rectangular cross-sections arranged side by side, and two members with flat cross-sections arranged on top of each other with a staggered arrangement.

[0068] <Modification> Next, modified examples of the backers 1, 1' and joint structure described above will be explained. The modified examples described below can be appropriately combined.

[0069] The panel P2 is not limited to a sandwich panel having the same structure as the panel P1. The panel P2 may be a sandwich panel having a different structure from the panel P1, and may be any other panel other than a sandwich panel.

[0070] 1A and 1B has a cross-sectional shape of a pair of glasses, but the cross-sectional shape of the backer 1 is not limited to this and various shapes are possible. Other cross-sectional shapes of the backer 1 include the above-mentioned Daruma shape and a shape with a recess formed on one side of a rounded rectangle, but other shapes that can be considered include, for example, a shape in which three or more circles are overlapped with a common chord in the width direction of the joint 5, and a shape in which a square recess is formed in an ellipse.

[0071] 3A and 3B has a cross-sectional shape of a chamfered rectangle or a circle, but the cross-sectional shape of the backer 1' is not limited to these and various shapes are possible. Other cross-sectional shapes of the backer 1' include, for example, oval shapes such as an ellipse, an oval, a rounded rectangle, and an egg shape, polygons other than a rectangle such as a triangle, a pentagon, and a hexagon, quadrangles other than a square and a rectangle such as a trapezoid and a parallelogram, a glasses shape, a Daruma shape, and the like.

[0072] 2A and 2B includes a retaining member 7, but any member other than the retaining member 7 may be used as long as it is a member that can suppress the movement of rainwater or the like toward the back side of the joint 5. Also, the retaining member 7 does not have to be used.

[0073] In the second embodiment, the backer 1' is held by a retaining member 7', which is a member such as a gasket, but it may also be anything other than a member that is within the joint and holds the backer 1', such as a part formed from the metal outer skin of the panel, or this part covered with sealing tape, etc.

[0074] (summary) Like the backer 1 of the embodiment and its modified examples described above, the backer (1) of the first aspect has the following configuration.

[0075] That is, the backer (1) of the first embodiment supports a sealant (6) disposed in a joint (5) formed between two adjacent panels (P1, P2). The backer (1) is a columnar body with the direction in which the joint (5) extends as the longitudinal direction, and the columnar body has two contact parts (10, 10) that contact each of the two panels (P1, P2) and a drainage channel forming part (11) that forms a drainage channel on the opposite side of the sealant (6). In a cross section perpendicular to the longitudinal direction of the columnar body, the contact parts (10, 10) are arc-shaped convex toward the panels (P1, P2), and the drainage channel forming part (11) is concave.

[0076] The backer (1) of the first embodiment having the above-mentioned configuration has two contact parts (10, 10) that are arc-shaped in cross section, and therefore contacts the two panels (P1, P2) at one location each with a smaller area. This prevents the formation of gaps between the two contact parts (10, 10) and the two panels (P1, P2), and prevents the infiltration of rainwater and the like due to capillary action, etc., so that the backer (1) has excellent watertightness. In addition, two drainage channels (S1, S2) are formed on the back side of the joint from the contact points between the two contact parts (10, 10) and the two panels (P1, P2), and in addition, the backer (1) has a drainage channel forming part (11) on the opposite side to the sealant (6), and this drainage channel forming part (11) has a concave cross section, so that a drainage channel (S3) is further formed. These three drainage channels (S1, S2, S3) allow rainwater or other water to pass through and fall to the bottom level where the drainage pipe is located, even if the water seeps into the back of the joint (5). This allows the rainwater or other water that seeps in through the drainage pipe to be discharged to the outdoor side of the panels (P1, P2), giving the backer (1) excellent drainage properties.

[0077] Furthermore, like the backer 1 of the embodiment and its modified example described above, the backer (1) of the second aspect additionally has the following configuration in addition to the configuration of the first aspect.

[0078] That is, the backer (1) of the second embodiment has a cross-sectional shape like glasses.

[0079] The backer (1) of the second embodiment having the above-mentioned configuration has a cross section in the shape of glasses, and is symmetrical both left and right and up and down, so that the force at the contact points between the two contact parts (10, 10) and the two panels (P1, P2) is applied perpendicularly and evenly to the surfaces of the two panels (P1, P2). This further improves the watertightness of the backer (1).

[0080] Also, like the backer 1' of the embodiment and its modified example described above, the backer (1') of the third aspect has the following configuration.

[0081] That is, the backer (1') of the third embodiment supports a sealant (6) placed in a joint (5) formed between two adjacent panels (P1, P2). The backer (1') is held by a retaining member (7') placed in the joint (5). The backer (1') is a columnar body whose longitudinal direction is the direction in which the joint (5) extends, and the columnar body has two contact portions (10', 10') that contact each of the two panels (P1, P2) and a first drainage channel forming portion (11') that forms the drainage channels (S1, S2) on the opposite side of the sealant (6). The retaining member (7) has a second drainage channel forming portion that forms the drainage channel on the first drainage channel forming portion (11') side. In a cross section perpendicular to the longitudinal direction of the columnar body, the contact portions (10', 10') are convex toward the panels (P1, P2), and the second drainage channel forming portion of the retaining member (7') is concave.

[0082] The backer (1') of the third embodiment having the above-mentioned configuration has two contact parts (10', 10') with a convex cross-sectional shape, and thus contacts the two panels (P1, P2) at one contact point each. This prevents the formation of gaps between the two contact parts (10', 10') and the two panels (P1, P2), and inhibits the infiltration of rainwater, etc., due to capillary action, etc., so that the backer (1') has excellent watertightness. In addition, two drainage channels (S1, S2) are formed on the back side of the joint from the contact points between the two contact parts (10', 10') and the two panels (P1, P2), and in addition, the backer (1') is held by a holding member (7') arranged in the joint (5), and the holding member (7') has a second drainage channel forming part on the first drainage channel forming part (11') side of the backer (1'), and this second drainage channel forming part has a concave cross section, so that a drainage channel (S3) is further formed. Even if rainwater or the like infiltrates into the back side of the joint (5), these three drainage channels (S1, S2, S3) allow it to fall through the three drainage channels (S1, S2, S3) to the lowest level where the drainage pipe is located, so that the rainwater or the like that infiltrates from this drainage pipe can be discharged to the outdoor side of the panels (P1, P2), and the backer (1') has excellent drainage properties.

[0083] Like the backer 1' of the embodiment and its modified example described above, the backer (1') of the fourth aspect additionally has the following configuration in addition to the configuration of the third aspect.

[0084] That is, the backer (1') of the fourth embodiment has a cross-sectional shape of a chamfered rectangle.

[0085] The backer (1') of the fourth embodiment having the above-mentioned configuration has a cross section of a beveled rectangle, so that it comes into contact with the two panels (P1, P2) at a smaller contact area, which can further improve the watertightness of the backer (1').

[0086] Further, like the backers 1, 1' of the above-mentioned embodiment and its modified examples, the backer (1, 1') of the fifth aspect additionally has the following configuration in addition to the configurations of the first to fourth aspects.

[0087] That is, the backer (1, 1') of the fifth embodiment is formed of an elastic body.

[0088] The backer (1, 1') of the fifth embodiment having the above-mentioned configuration is made of an elastic body, and therefore can further increase the pressing force at the contact points between the contact portions (10, 10) and the panels (P1, P2). Therefore, the backer (1, 1') of the fifth embodiment can further improve the watertightness.

[0089] Furthermore, like the joint structures of the above-mentioned embodiments and their modified examples, the joint structure (100, 100') of the sixth aspect has the following configuration.

[0090] That is, the sixth embodiment of the joint structure comprises two adjacent panels (P1, P2), a sealant (6) placed in a joint (5) formed between the two panels (P1, P2), and a backer (1, 1') of any one of the first to fifth embodiments placed on the rear side of the joint (5) relative to the sealant (6).

[0091] The sixth embodiment of the joint structure (100, 100') having the above-mentioned configuration uses the above-mentioned backer (1, 1') which is excellent in both watertightness and drainage properties, so that it is possible to prevent rainwater, etc. from penetrating into the building through gaps, etc. that occur between the sealant (6) and the two panels (P1, P2) from the joint (5). Even if rainwater, etc. does penetrate through gaps, etc. between the two panels (P1, P2) and the backer (1, 1'), it can be made to pass through the three drainage channels (S1, S2, S3) and fall to the lowest level where the drainage pipe is located. Therefore, the rainwater, etc. that penetrates through this drainage pipe can be discharged to the outdoor side of the panels (P1, P2), and the backer (1') also has excellent drainage properties.

[0092] Furthermore, like the joint structures of the above-mentioned embodiment and its modified example, the joint structure (100) of the seventh aspect additionally has the following configuration in addition to the configuration of the sixth aspect.

[0093] That is, the joint structure (100) of the seventh embodiment further includes a retaining member (7) that is arranged on the inner side of the joint (5) relative to the backers (1, 1').

[0094] The seventh embodiment of the joint structure (100) having the above-mentioned configuration has a retaining member (7) on the rear side of the joint (5) of the backer (1), so that the three drainage channels (S1, S2, S3) formed are narrower, which further promotes the discharge of infiltrated rainwater, etc., and improves drainage performance.

[0095] The present disclosure has been described above based on the form shown in the attached drawings, but the present disclosure is not limited to the above form, and appropriate design changes are possible within the intended scope of the present disclosure. [Explanation of symbols]

[0096] 1 Backer 10,10' Contact 11 Drainage channel forming part 11' First drainage channel forming part 5 Joint 50 Vertical joint 51 Horizontal joint 6 Sealing materials 7,7' Retaining member (packing) P1, P2 Panel S1,S2,S3 Drainage channel T Water Stop Line

Claims

1. A backer for supporting a sealant disposed in a joint formed between two adjacent panels, A columnar body having a longitudinal direction in the direction in which the joints extend, The pillar has two contact portions that contact the two panels, respectively, and a drainage channel forming portion that forms a drainage channel on the opposite side of the sealant, A backer characterized in that, in a cross section of the columnar body in a direction perpendicular to the longitudinal direction, the contact portion is arc-shaped convex toward the panel, and the drainage channel forming portion is concave.

2. The backer according to claim 1 , wherein the cross-sectional shape is a glasses shape.

3. A backer for supporting a sealant disposed in a joint formed between two adjacent panels, The joint is held by a holding member disposed in the joint, A columnar body having a longitudinal direction in the direction in which the joints extend, The pillar has two contact portions that contact the two panels, respectively, and a first drainage channel forming portion that forms a drainage channel on an opposite side of the sealant, The holding member has a second drainage channel forming portion that forms a drainage channel on the first drainage channel forming portion side, A backer characterized in that, in a cross section of the columnar body in a direction perpendicular to the longitudinal direction, the contact portion has a convex shape toward the panel, and the second drainage channel forming portion of the retaining member is concave.

4. The backer of claim 3 wherein said cross-sectional shape is a chamfered square.

5. 5. The backer according to claim 1, which is formed of an elastic material.

6. Two panels adjacent to each other, a sealant disposed in a joint formed between the two panels; The backer according to any one of claims 1 to 5, which is disposed on the back side of the joint relative to the sealant. A joint structure having:

7. The joint structure according to claim 6 , further comprising a retaining member arranged on the back side of the joint relative to the backer.

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