JP2009263870A - Backup member for joint and joint structure using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backup member easily attachable even to joint sections with different opening widths without a gap and reduced in the variation of the insertion positions thereof in the depth direction of the joint section. <P>SOLUTION: This backup member 5 for joint is attached to the joint section 3 formed between outer walls 1 adjacent to each other before the joint section is filled with a sealing material 7. The backup member 5 includes band tabular foam synthetic resin layers 10. Slit parts 12 for guiding the bending are formed at the lateral intermediate part of one surface of the foam synthetic resin layer 10 in the longitudinal direction. The foam synthetic resin layer is foldable in a generally U-shape along the slit parts 12. Also, a nonfoam synthetic resin layer 11 is placed on the other surface of the foam synthetic resin layer 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a joint backup material that is loaded and used at the back of a joint part of an outer wall material adjacent to a building, and a joint structure using the same.

  As a joint structure of a building, after loading a long backup material made of synthetic resin foam into the back part of the joint part formed between adjacent outer wall materials, a sealing material is placed inside the joint part outside the backup material. By filling, a joint structure that can absorb the fluctuation of the joint portion due to expansion and contraction of the outer wall material while ensuring the water tightness and air tightness of the joint portion is widely adopted. For example, when a ceramic siding board is used as an outer wall material, such a joint structure is widely adopted because the ceramic siding board itself tends to shrink gradually due to secular change.

  As the backup material, circular cross-sections made of a synthetic resin foam that is slightly wider than the joint opening width and rectangular string-like ones are widely used. It is applied to the joint part of a building and is press-fitted and installed in the back part of the joint part with a spatula or the like (for example, see Patent Document 1).

JP-A-10-219960

  By the way, since the opening width of the joint portion is usually set within a range of 5 to 40 mm, a plurality of types of backup materials having different widths are produced according to the opening width of the joint portion of the building. When manufacturing multiple types of backup materials, the manufacturing cost is higher than when manufacturing one type of backup material, and it is necessary to individually store, manage, and transport products. Therefore, there is a problem that those operations become complicated. In addition, when the opening width of the joint portion is narrow, the backup material was forcibly fitted by pressing with a spatula, but the backup material was damaged at the contact portion with the spatula, and air entered the damaged portion when filling the sealing material. In some cases, the air expands due to an increase in the outside air temperature and the sealing material expands. Furthermore, when the press-fitting resistance of the backup material with respect to the joint portion is increased, there is a problem in that the insertion position of the backup material in the depth direction of the joint portion is likely to vary.

  An object of the present invention is to provide a backup material that can be easily loaded without gaps on joints having different opening widths, and that can reduce variation in the insertion position in the depth direction of the joints, and a joint structure using the same. Is to provide.

  The joint backup material according to the present invention is a joint backup material that is loaded in a joint portion formed between adjacent outer wall materials prior to the filling of the sealing material, and includes a strip-shaped foamed synthetic resin layer. And forming a notch for bending guidance along the length direction in the middle of the width direction of one surface of the foamed synthetic resin layer, and bends in a substantially U shape along the notch. It has become possible.

  In this joint backup material, the folded portion is located on the opening side of the joint portion with the notch portion positioned on the inner side and the backup material is bent in a substantially U shape along the cut portion. The back-up material is loaded into the back part of the joint part so that the part side is located on the back side of the joint part, and the back-up material is applied to the joint part. At this time, the foamed synthetic resin layer is compressed and deformed inside the bent portion of the backup material, and a repulsive force is generated in the bent portion to return the backup material to a flat original shape. And by this repulsive force, both ends of the backup folded in a substantially U shape are pressed against the end face of the outer wall material facing the joint, and the backup material is connected to the joint so that no gap is formed between the backup material and the outer wall material. Can be installed properly. Since the back-up material is applied to the joint part by utilizing the repulsive force generated in the bent part as described above, the distance between both ends of the back-up material becomes the opening width even for the joint part having a different opening width. By following and changing, both ends of the backup material can be pressed against the end face of the outer wall material facing the joint portion, and the backup material can be appropriately applied to the joint portion.

  For this reason, since it is not necessary to produce a plurality of types of backup materials according to the opening width of the joint portion, the production cost of the backup materials can be reduced, and the backup materials can be stored and managed easily. In addition, the press-fit resistance when loading the backup material into the joint is not significantly affected by the opening width of the joint, and hardly changes even if the opening width of the joint changes. Therefore, even when the backup material is inserted or the opening width of the joint part varies due to construction errors of the outer wall material, the backup material can be constructed with almost no change in the force applied by the spatula. It becomes possible to press-fit with accuracy in the depth direction.

  Here, it is a preferred embodiment that a non-foamed synthetic resin layer is provided in a laminated form on the other surface of the foamed synthetic resin layer. In this case, the backup material can be loaded into the joint portion in a state of being bent in a substantially U shape so that the non-foamed synthetic resin layer is positioned on the outer surface side. And when loaded in this way, the non-foamed synthetic resin layer allows the outer surface side of the backup material to be formed into a smooth surface, so when filling the sealing material to the joints, the non-foamed synthetic resin of the sealing material Air can be effectively prevented from being mixed into the interface with the resin layer, and the swelling of the sealing material due to air being mixed into the interface can be prevented. In addition, the non-foamed synthetic resin layer also functions as a protective film that protects the backup material, preventing the backup material from being damaged or wrinkled when the backup material is stored and transported or loaded into the joint. Therefore, the swelling of the sealing material due to air mixed into the interface can be more effectively prevented.

  In a preferred embodiment, a synthetic resin film is attached to the other surface of the strip-shaped synthetic resin foam to form the foamed synthetic resin layer and the non-foamed synthetic resin layer. With this configuration, the backup material can be manufactured at low cost. Affixing can be performed by using a pressure-sensitive adhesive, an adhesive, or fusion. However, at the time of molding the synthetic resin foam, it is possible to form a skin layer on the other surface to form a foamed synthetic resin layer and a non-foamed synthetic resin layer.

  In a preferred embodiment, a plurality of the cut portions are formed along the length direction at intervals in the width direction of one surface of the foamed synthetic resin layer. In this case, since the backup material can be bent in a U shape step by step by a plurality of cut portions, the outer surface of the bent portion of the backup material becomes a semicircular cross section with the opening width of the joint portion as the diameter, The gap between the end surfaces of the backup material and the outer wall material can be reduced.

  A V-shaped notch may be formed as the notch. As the incision part, it is sufficient to cut the foamed synthetic resin layer with a blade, but when the foamed synthetic resin layer is cut into a V shape to form the incision part, the backup material can be easily and cleanly substantially U-shaped. Can be folded into a letter shape. Although the cutting depth of the foamed synthetic resin layer can be arbitrarily set, it is preferably formed up to the vicinity of the synthetic resin sheet.

  Backup lines for joints are formed by forming cut lines along the length direction on both sides of the backup material for joints, and providing a height adjustment part having a constant width outside the cut lines, and cutting the height adjustment parts along the cut lines. It is also a preferred embodiment that the height of the material can be adjusted. If comprised in this way, it will become possible to adjust the sealing material filled to a joint part uniformly by adjusting the height of a backup material according to the depth of a joint part.

  The joint structure of a building according to the present invention is a joint structure of a building using the joint backup material according to the present invention, and the joint backup material is formed in a joint portion formed between adjacent outer wall materials. With the non-foamed synthetic resin layer on the outside, folded in a substantially U shape along the notch, and loaded so that both ends are located on the back side of the joint, than the joint backup material A sealing material is filled on the opening side of the joint. In this joint structure, the same effect as the joint backup material according to the present invention can be obtained.

  According to the joint backup material according to the present invention, it is possible to realize a backup material that can be properly constructed even for joint portions having different opening widths, and it is necessary to produce a plurality of types of backup materials according to the joint opening width. Therefore, the production cost of the backup material can be reduced and the backup material can be stored and managed easily. In addition, the press-fit resistance when loading the backup material into the joint is not significantly affected by the opening width of the joint, and hardly changes even if the opening width of the joint changes. Therefore, even when the backup material is inserted or the opening width of the joint part varies due to construction errors of the outer wall material, the backup material can be constructed with almost no change in the force applied by the spatula. It becomes possible to press-fit with accuracy in the depth direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Explaining the joint structure of the building, as shown in FIG. 1, a plurality of outer wall materials 1 made of ceramic siding boards and the like are provided at regular intervals, and the back side (indoor side) of each outer wall material 1 A base plate 2 is provided, and a joint portion 3 is provided between the adjacent outer wall material 1 and the base plate 2. A frame material 4 is provided along the joint portion 3 on the back side of the base plate 2, and the indoor side of the joint portion 3 is closed by the frame material 4. A back-up material 5 is loaded in the back of the joint portion 3, and a sealing material 7 is filled on the front side of the back-up material 5 with the primer 6 applied to the side surface of the outer wall material 1. However, as long as the joint structure itself of the building has the backup material 5 and the sealing material 7, a joint structure having an arbitrary configuration other than the configuration shown in FIG. 1 can be adopted.

  As shown in FIGS. 1 to 3, the backup material 5 is a strip-shaped foamed synthetic resin in which a notch 12 for bending guidance is formed along the length direction in the middle of the width direction of one surface. A layer 10 and a non-foamed synthetic resin layer 11 provided on the other surface of the foamed synthetic resin layer 10 in a laminated form, with the non-foamed synthetic resin layer 11 on the outer surface side, and a substantially U shape along the notch 12 It can be bent into a shape. The backup material 5 is stored or transported, for example, spirally wound or cut into a certain length. However, the non-foamed synthetic resin layer 11 is not an essential component and can be omitted.

  The foamed synthetic resin layer 10 and the non-foamed synthetic resin layer 11 constituting the backup material 5 constitute the non-foamed synthetic resin layer 11 on the surface of the strip-shaped synthetic resin foam constituting the foamed synthetic resin layer 10. The synthetic resin film is attached by adhering with an adhesive, a pressure-sensitive adhesive, or fusion. However, it is also possible to form a smooth and non-breathable skin layer formed on the surface of the foamed synthetic resin foam by heating and melting it, and use this as the non-foamed synthetic resin layer 11. . The width BW of the backup material 5 is set to 8 mm or more and 100 mm or less, preferably 10 mm or more and 60 mm or less in consideration of the depth of the joint portion 3 of the building and the ease of folding the backup material 5 into a substantially U shape. It is preferable. The thickness BT of the backup material 5 is set to, for example, 2 mm or more and 15 mm or less, preferably 2 mm or more and 5 mm or less in consideration of the opening width W1 of the joint part 3 of the building.

  The foamed synthetic resin layer 10 is made of a synthetic resin foam such as polystyrene, vinyl chloride resin, polyurethane, polyethylene, neoprene, chloroprene, EPDM, or polypropylene. The expansion ratio is set to 10 to 25 times. The foam may be an independent foam, may be a continuous foam, or may be a foam in which closed cells and open cells are mixed. It is also possible to employ a foam that foams in one or two stages. In particular, the polyethylene foam is rich in elasticity, solvent resistance, and chemical resistance, and does not adhere to the sealing material 7, thereby preventing the sealing material 7 from adhering to the three surfaces in the joint portion 3. This is preferable because the sealing material 7 can be prevented from being damaged by the variation in the opening width W1 of the joint portion 3.

  The non-foamed synthetic resin layer 11 is composed of a polyolefin resin film such as polyethylene or polypropylene, or a synthetic resin film such as a vinyl chloride resin film. The thickness of the non-foamed synthetic resin layer 11 can be arbitrarily set, but is 0.02 mm or more and 1.0 mm or less, preferably 0. 0 mm so that the backup material 5 can be easily bent along the cut portion 12. It is preferable to set it to 05 mm or more and 0.2 mm or less.

  The notch 12 is formed in the middle of the backup material 5 in the width direction along the length direction of the backup material 5. The formation position and the number of the cut portions 12 are arbitrary as long as the substantially central portion in the width direction of the backup material 5 can be easily bent into a substantially U shape along the cut portions 12. It is possible to form an arbitrary number of positions. In the present embodiment, at the center in the width direction of the backup material 5, approximately the same interval as the thickness of the foamed synthetic resin layer 10 is opened, and the four cut portions 12 are arranged in the length direction of the backup material 5. The three elongated divided portions 10a having a substantially square cross section formed of the foamed synthetic resin layer 10 are formed. However, it is also possible to form the number of cut portions 12 other than four. However, when the even number of cut portions 12 are formed so that an odd number of divided portions 10a are formed, the top of the bent portion 5a becomes flat, and the bent portion 5a is bent into an arc as a whole. Therefore, it is preferable. Moreover, although the space | interval of the adjacent notch part 12 was set substantially the same, it differs, for example, setting the space | interval of the two notch parts 12 of a center part wider than the space | interval of the outer two notch parts 12, It is also possible to set the interval.

  The cut depth of the cut portion 12 may be set to be the same as the thickness of the foamed synthetic resin layer 10, but is set slightly shallower than the thickness of the foamed synthetic resin layer 10, and the molding error of the cut portion 12, etc. Therefore, it is possible to prevent a problem that the cut portion 12 is formed up to the non-foamed synthetic resin layer 11. In the present embodiment, the foamed synthetic resin layer 10 is cut with a blade so as not to cut out the foamed synthetic resin layer 10 to form the cut portion 12. However, like the backup material 5A shown in FIG. It is also possible to form a cut portion 12A formed by cutting a part of the foamed synthetic resin layer 10 into, for example, a V shape or a U shape. When the non-foamed synthetic resin layer 11 is omitted, the foamed synthetic resin layer 10 is half-cut leaving a part on the other surface side.

  As the sealing material 7, a one-component or two-component amorphous sealing material made of a known material such as polyurethane, acrylic, polyisobutylene, silicone, modified silicone, polysulfide, and modified polysulfide is used. Depending on the outer wall material 1 and the like, it can be appropriately selected and employed.

Next, the construction method of the joint structure will be described.
First, as shown in phantom lines in FIG. 3, the non-foamed synthetic resin layer 11 is disposed on the outer side and the foamed synthetic resin layer 10 is disposed on the inner side of the belt-like backup material 5 as shown in FIGS. As shown in FIG. 4 (a), the folded back-up material 5 </ b> A is folded in a substantially U shape along the notch 12, and the folded portion 5 a is formed on the joint 3. The backup material 5 is applied to the joint part 3 by being loaded in the back part of the joint part 3 so that the both end parts 5b are located on the back side of the joint part 3. In this state, at the bent portion 5a of the backup material 5, the foamed synthetic resin layer 10 is compressed and deformed inside the non-foamed synthetic resin layer 11 curved in a substantially U shape, and the foamed synthetic resin layer 11 and the foamed synthetic resin layer 11 are foamed. In cooperation with the synthetic resin layer 10, a repulsive force is generated to return the backup material 5 to a flat original shape. And by this repulsive force, both end portions 5b of the backup folded in a substantially U shape are pressed against the end face of the outer wall material 1 facing the joint portion 3, so that no gap is formed between the backup material 5 and the outer wall material 1. The backup material 5 is appropriately applied to the joint portion 3.

  Next, as shown in FIG. 4B, the primer 6 is applied to the side surface of the outer wall material 1 with the masking tape 15 attached to the surface of the outer wall material 1 in the vicinity of the joint portion 3. The primer 6 increases the bonding strength between the sealing material 7 and the outer wall material 1, but depending on the material of the outer wall material 1, the bonding strength between the sealing material 7 and the outer wall material 1 can be sufficiently ensured, and is omitted. It is also possible.

  Next, as shown in FIG. 4C, after the primer 6 is dried, the sealing material 7 is filled into the joint portion 3, and then the sealing material 7 is pressed with a spatula to smooth the surface. Thereafter, the masking tape 15 is removed, and the construction of the joint structure is completed.

  In this way, the backup material 5 is folded in a substantially U shape, and the backup material 5 is appropriately applied to the joint portion 3 by utilizing the repulsive force generated in the bent portion 5a of the backup material 5, For example, as shown in FIG. 5, the curvature radius of the bent portion 5a of the backup material 5 becomes large even for the joint portion 3 having a different opening width W2, and the interval between the both end portions 5b changes following the opening width W2. By doing so, both ends 5b of the backup material 5 are brought into pressure contact with the end surface of the outer wall material 1 facing the joint portion 3, and the backup material 5 can be appropriately applied to the joint portion 3. For this reason, since it is not necessary to manufacture a plurality of types of backup material 5 according to the opening width of the joint portion 3, the production cost of the backup material 5 can be reduced, and the storage and management of the backup material 5 are facilitated.

  Moreover, the press-fit resistance when the backup material 5 is loaded into the joint portion 3 is not significantly affected by the opening width W1 of the joint portion 3, and hardly changes even if the opening width W1 of the joint portion 3 changes. As shown in FIG. 5, even when the backup material 5 is inserted into the joint portion 3 having a different opening width W2, or when the opening width W1 of the joint portion 3 varies due to the construction error of the outer wall material 1, Since the backup material 5 can be constructed with almost no change in force, the backup material 5 can be accurately press-fitted in the depth direction of the joint portion 3.

  Further, since the outer surface side of the backup material 5 can be formed into a smooth surface by the non-foamed synthetic resin layer 11, the non-foamed synthetic resin of the sealing material 7 is filled when the sealing material 7 is filled into the joint portion 3. Air can be effectively prevented from being mixed into the interface with the layer 11, and swelling of the sealing material 7 due to air being mixed into the interface can be prevented. In addition, the non-foamed synthetic resin layer 11 also functions as a protective film for protecting the backup material 5, and the surface of the backup material 5 is damaged or wrinkled when the backup material 5 is stored and transported or loaded into the joint portion 3. Therefore, it is possible to more effectively prevent the sealing material 7 from swelling due to air mixed into the interface.

  As shown by phantom lines in FIG. 2, one or a plurality of cut lines 8 are formed along the length direction on both sides of the backup material 5, and the height adjustment with a constant width is arranged outside the cut lines 8. It is also a preferred embodiment that the portion 5 c is cut along the cut line 8 so that the height of the joint backup material 5 can be adjusted according to the depth of the joint portion 3. The cut line 8 can be formed by cutting the entire thickness of the foamed synthetic resin layer 10 in the same manner as the cut portion 12 and by forming a half cut or a perforation for the non-foamed synthetic resin layer 11.

Cross-sectional view of main part of joint structure using backup material according to the present invention Perspective view of the backup material End view of the backup material (A)-(c) is explanatory drawing of the construction method of a joint joint structure Cross-sectional view of joint structure of other configuration with wide opening width of joint part End view of backup material with other configurations

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer wall material 2 Base plate 3 Joint part 4 Frame material 5 Backup material 5a Bending part 5b Both ends 5c Adjustment part 6 Primer 7 Sealing material 8 Cut line 10 Foam synthetic resin layer 10a Dividing part 11 Non-foam synthetic resin layer 12 Cut part 5A Backup material 12A Cutting part 15 Masking tape

Claims (7)

In a joint formed between adjacent outer wall materials, a joint backup material loaded prior to filling with a sealing material,
A strip-shaped foamed synthetic resin layer is provided, and a notch for bending guidance is formed in the middle of the width direction of one surface of the foamed synthetic resin layer along the length direction. It became possible to bend in a substantially U shape along
This is a backup material for joints.   The joint backup material according to claim 1, wherein a non-foamed synthetic resin layer is provided in a laminated form on the other surface of the foamed synthetic resin layer.   The joint backup material according to claim 2, wherein a synthetic resin film is attached to the other surface of the strip-shaped synthetic resin foam to form the foamed synthetic resin layer and the non-foamed synthetic resin layer.   The said cut | notch part formed in the middle part of the width direction of one surface of a foamed synthetic resin layer in multiple numbers along the length direction at intervals mutually. Backup material for joints.   The joint backup material according to any one of claims 1 to 4, wherein a V-shaped cut portion is formed as the cut portion.   Backup lines for joints are formed by forming cut lines along the length direction on both sides of the backup material for joints, and providing a height adjustment part having a constant width outside the cut lines, and cutting the height adjustment parts along the cut lines. The joint backup material according to any one of claims 1 to 5, wherein the height of the material can be adjusted. It is the joint structure of the building using the backup material for joints of any one of Claims 1-6,
In the joint portion formed between the adjacent outer wall materials, the joint backup material is folded in a substantially U shape along the cut portion with the non-foamed synthetic resin layer on the outside, and both ends are joint portions. Load so that it is located on the back side,
Filling the opening side of the joint part with the sealing material than the joint backup material,
The joint structure of a building characterized by this.

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