JP7372752B2 - Backup material and wall structure - Google Patents

Description

The present invention relates to backup materials and wall structures. More specifically, the present invention relates to a back-up material that supports a sealant placed in a joint formed between adjacent wall materials, and a wall structure using the back-up material.

Patent Document 1 describes an exterior wall joint structure of a building. This exterior wall joint structure relates to a joint structure when an exterior plate material having a hollow portion penetrating from one side end to the other side end is used.

FIG. 6 shows a wall structure in the case of using an outer wall material having a hollow part, similar to Patent Document 1. In this wall structure, a plurality of wall materials 40 are provided on the outdoor side of a base 50. The wall material 40 is a ceramic-based exterior wall material, and as shown in FIG. 7, it is formed into a plate shape having two sides lined up in the thickness direction. The wall material 40 is provided with a hollow portion 41 that penetrates in the lateral direction. An end portion of the hollow portion 41 is open to a side end surface 44 of the wall material 40. A plurality of hollow portions 41 are formed in the wall material 40, and the plurality of hollow portions 41 are arranged in the vertical direction. A convex part 42 is provided at the upper end of the wall material 40, and a concave part 43 is provided at the lower end of the wall material 40.

As shown in FIG. 6, the plurality of wall materials 40 are attached to a base 50 using fasteners 51. Wall materials 40 that are adjacent in the vertical direction are connected by fitting a convex part 42 and a concave part 43 into each other. Wall materials 40 that are adjacent in the horizontal direction are arranged with their side end surfaces 44 facing each other. The space between the opposing side end surfaces 44 is formed as a joint 20. The joint 20 is filled with a sealant 30 to improve waterproofness. In this case, a backup material (hat-shaped joiner) 10 is used to support (back up) the sealing material 30.

As shown in FIG. 8A, the backup material 10 extends in the vertical direction and has a hat-shaped cross section. The backup material 10 has a support part 102 formed with a U-shaped cross section from a receiving part 103 and two leg parts 104, and a fixing part 101 that projects outward from the end of each leg part 104. There is. The surface of the receiving portion 103 is formed as a receiving surface 11 with which the sealing material 30 comes into contact.

After fixing the fixing part 101 to the base 50 and attaching the backup material 10, the wall material 40 is attached laterally so as to sandwich the supporting part 102 to form the joint 20. After this, the joint 20 is attached from the outdoor side. The sealing material 30 is filled. As a result, as shown in FIGS. 8B and 8C, the sealing material 30 is brought into contact with the receiving surface 11 of the backup material 10 disposed within the joint 20, and the sealing material 30 is supported by the support portion 102. The backup material 10 keeps the width and depth of the sealing material 30 appropriate, so that the appearance of the wall is not impaired.

By the way, when the wall material 40 has the hollow part 41, the air in the hollow part 41 may expand due to a rise in temperature or the like. Therefore, the air in the hollow part 41 is discharged from the opening at the end of the hollow part 41 through the gap 53 to the ventilation layer 52 formed between the back surface of the wall material 40 and the surface of the base 50. Here, the gap 53 is provided between the side end surface 44 of the wall material 40 and the leg portion 104 of the backup material 10.

Japanese Patent Application Publication No. 2002-54243

However, in the above-mentioned conventional example, since the gap 53 is small, it depends on the relative position between the wall material 40 and the backup material 10, the viscosity of the backup material 10, the filling amount, the formation position, the filling method, the change over time, etc. In some cases, the gap 53 was not formed (closed). If the gap 53 is not formed, the sealing material 30 will be pushed by the pressure of the air expanded within the hollow part 41, and the sealing material 30 will be deformed so as to swell to the front side, or partially from the joint 20 to the front side. In some cases, they could fly out, damaging the appearance of the wall.

The present invention has been made in view of the above reasons, and an object of the present invention is to provide a backup material and a wall structure in which the appearance of a wall is less likely to be impaired.

A backup material according to one aspect of the present invention is a backup material that supports a sealing material placed in a joint formed between laterally adjacent wall materials, and the backup material extends in the vertical direction. It has a support part that is elongated and has a U-shaped cross section from a receiving part and two legs, and a fixing part that projects outward from the end of the leg part, The surface is formed as a receiving surface with which the sealing material comes into contact, a part of the receiving surface is recessed toward the rear, and a plurality of recesses opening in the front surface and both side surfaces are formed in a line in the vertical direction, The bottom surface of the recess is formed as an inclined surface with the upper end located further rearward than the lower end, and a ventilation hole penetrating the receiving part and opening into the recess is formed above the recess. The recess is arranged so as to correspond to the opening of the hollow section that passes through the wall material in the horizontal direction with the backup material disposed at the joint, and the sealing material expands at the recess. A possible space is formed, and the opening of the hollow part and the ventilation hole are configured to communicate through the space.
A backup material according to another aspect of the present invention is a backup material that supports a sealing material placed in a joint formed between laterally adjacent wall materials, wherein the backup material is arranged in a vertical direction. The support part is elongated and has a U-shaped cross section formed from a receiving part and two leg parts, and a fixing part protrudes outward from the end of the leg part. The surface of the part is formed as a receiving surface with which the sealing material comes into contact, and a part of the flat receiving surface is recessed toward the rear, and a plurality of recesses opening in the front surface and both side surfaces are lined up and down in the vertical direction. a bottom surface of the recess is formed as a flat surface, a ventilation hole passing through the receiving part and opening into the recess is formed above the recess, and the recess is formed so that the backup material is in the joint. In the arranged state, the sealing material is disposed so as to correspond to the opening of the hollow part that passes through the wall material in the horizontal direction, and a space in which the sealing material can expand is formed at the location of the recess, and a space in which the sealing material can expand is formed in the hollow part. The opening and the ventilation hole are configured to communicate through the space.
A backup material according to another aspect of the present invention is a backup material that supports a sealing material placed in a joint formed between laterally adjacent wall materials, wherein the backup material is arranged in a vertical direction. The support part is elongated and has a U-shaped cross section formed from a receiving part and two leg parts, and a fixing part protrudes outward from the end of the leg part. The surface of the part is formed as a receiving surface with which the sealing material comes into contact, and the receiving surface has a curved surface shaped like the outer surface of an upwardly facing cannonball that is convexly curved toward the front side, and a flat surface located above the curved surface. A recessed portion having a bottom surface configured of , the recess is formed above the recess, and the recess is arranged to correspond to the opening of the hollow part that passes through the wall material in the horizontal direction with the backup material disposed at the joint; A space in which the sealing material can expand is formed at the location, and the opening of the hollow portion and the ventilation hole are configured to communicate through the space.
A backup material according to another aspect of the present invention is a backup material that supports a sealing material placed in a joint formed between laterally adjacent wall materials, wherein the backup material is arranged in a vertical direction. The support part is elongated and has a U-shaped cross section formed from a receiving part and two leg parts, and a fixing part protrudes outward from the end of the leg part. The surface of the part is formed as a receiving surface with which the sealing material comes into contact, and a part of the flat receiving surface is recessed toward the rear, and a plurality of recesses opening in the front surface and both side surfaces are lined up and down in the vertical direction. a bottom surface of the recess is configured with a curved surface concavely curved toward the front side, a ventilation hole penetrating the receiving part and opening into the recess is formed above the recess, and the recess is With the backup material placed at the joint, the backup material is placed so as to correspond to the opening of the hollow section that passes through the wall material in the lateral direction, and a space in which the sealing material can expand is formed at the recess. In addition, the opening of the hollow portion and the ventilation hole are configured to communicate with each other via the space.

A wall structure according to one aspect of the present invention is a wall structure using the above-mentioned backup material, in which a plurality of wall materials each having a hollow portion penetrating in the lateral direction are arranged adjacent to each other in the lateral direction so that the joints are The recessed portion of the backup material is arranged at the joint so that the position of the hollow portion corresponds to the position of the recessed portion, and a space in which the sealing material can expand is formed at the location of the recessed portion. At the same time, the opening of the hollow portion in the wall material and the ventilation hole communicate with each other via the space .

According to the present invention, there is an advantage that even if the sealing material receives pressure from expanded air, it can expand to the back side due to the recessed portion on the back side, and is less likely to deform to the front side, so that the appearance of the wall is less likely to be damaged.

FIG. 1A is a partially omitted perspective view showing an embodiment of a backup material according to the present invention. FIG. 1B is a cross-sectional view showing one embodiment of a wall structure according to the present invention. FIG. 1C is a longitudinal cross-sectional view showing one embodiment of a wall structure according to the present invention. FIG. 2A is a partially omitted perspective view showing another embodiment of the backup material according to the present invention. FIG. 2B is a longitudinal sectional view showing another embodiment of the backup material according to the present invention. FIG. 3A is a partially omitted perspective view showing another embodiment of the backup material according to the present invention. FIG. 3B is a longitudinal sectional view showing another embodiment of the backup material according to the present invention. FIG. 4A is a partially omitted perspective view showing another embodiment of the backup material according to the present invention. FIG. 4B is a longitudinal sectional view showing another embodiment of the backup material according to the present invention. FIG. 5A is a partially omitted perspective view showing another embodiment of the backup material according to the present invention. FIG. 5B is a longitudinal sectional view showing another embodiment of the backup material according to the present invention. FIG. 5C is a partial vertical sectional view showing yet another embodiment of the backup material according to the present invention. FIG. 6 is a perspective view showing an example of a wall structure. FIG. 7 is a perspective view showing an example of a wall material. FIG. 8A is a partially omitted perspective view showing a conventional backup material. FIG. 8B is a cross-sectional view of a conventional wall structure. FIG. 8C is a longitudinal cross-sectional view showing a conventional wall structure.

(Embodiment)
FIG. 1A shows a backup material 10 according to this embodiment. The material of the backup material 10 is resin, metal such as aluminum or steel plate, or the like.

The backup material 10 is elongated and extends in the vertical direction. The backup material 10 has a support part 102 formed with a U-shaped cross section from a receiving part 103 and two leg parts 104, and a fixing part 101 that projects outward from the end of each leg part 104. There is. The surface of the receiving portion 103 is formed as a receiving surface 11 with which the sealing material 30 comes into contact.

The backup material 10 has a recess 12. The backup material 10 has a plurality of recesses 12. The plurality of recesses 12 are formed side by side in the vertical direction. The recess 12 is open at the front and both side surfaces. The bottom surface 121 of the recess 12 is formed such that the upper end is located further back than the lower end. That is, the bottom surface 121 of the recessed portion 12 is formed as an inclined surface that is positioned further back as it goes upward. Therefore, the lower end of the bottom surface 121 is located further forward than the upper end. Note that the front is a direction facing away from the base 50 when the backup material 10 is attached to the base 50 of the wall, and is usually a direction facing outdoors from the base 50. The term "backward" refers to the direction facing the base 50 of the wall when the backup material 10 is attached to the base 50 of the wall, and is usually the direction facing indoors.

The backup material 10 has a ventilation hole 13 above the recess 12. The ventilation holes 13 are formed to correspond to each of the recesses 12. That is, the backup material 10 has a plurality of ventilation holes 13. The ventilation hole 13 is formed to penetrate the receiving part 103. Therefore, the recess 12 communicates with the space behind the receiving part 103 (the space between the opposing legs 104) via the ventilation hole 13. The ventilation hole 13 has an opening surface parallel to an imaginary plane orthogonal to the longitudinal direction of the backup material 10.

The backup material 10 according to this embodiment is constructed in the same manner as conventional backup materials. That is, the backup material 10 according to the present embodiment is applied to a wall structure using a wall material 40 having a hollow portion 41, as shown in FIG.

This wall structure is an external wall structure, and a plurality of wall materials 40 are provided on the outdoor side of the base 50. The wall material 40 is a ceramic-based exterior wall material, and as shown in FIG. 7, it is formed into a plate shape having two sides lined up in the thickness direction. The wall material 40 is provided with a hollow portion 41 that penetrates in the lateral direction. The ends of the hollow portion 41 are open to both side end surfaces 44 of the wall material 40 . A plurality of hollow portions 41 are formed in the wall material 40, and the plurality of hollow portions 41 are arranged in the vertical direction. A convex part 42 is provided at the upper end of the wall material 40, and a concave part 43 is provided at the lower end of the wall material 40.

The plurality of wall materials 40 are attached to the base 50 using fasteners 51. Wall materials 40 that are adjacent in the vertical direction are connected by fitting a convex part 42 and a concave part 43 into each other. Wall materials 40 that are adjacent in the horizontal direction are arranged with their side end surfaces 44 facing each other. The space between the opposing side end surfaces 44 is formed as a joint 20. The joint 20 is filled with a sealant 30 to improve waterproofness.

After fixing the fixing part 101 to the base 50 and attaching the backup material 10, a plurality of wall materials 40 are attached laterally with the supporting part 102 in between to form the joint 20. After this, the joint 20 is formed from the outdoor side. 20 is filled with sealing material 30. As a result, as shown in FIGS. 1B and 1C, the sealing material 30 is brought into contact with the receiving surface 11 of the backup material 10 disposed within the joint 20, and the sealing material 30 is supported by the support portion 102.

Here, the wall material 40 has a plurality of hollow parts 41, and the wall material 40 and the backup material 10 are arranged so that at least one recess 12 corresponds to each hollow part 41. Further, in a side view, the lower end portion of the bottom surface 121 of the recess 12 overlaps the opening of the hollow portion 41 in the front-rear direction. Therefore, each hollow portion 41 is in communication with at least one recess 12 via the gap 53. Furthermore, since the recess 12 is formed in the receiving surface 11, the sealing material 30 is not filled until the recess 12 is closed. That is, as shown in FIG. 1C, the sealing material 30 is caught on the lower end of the bottom surface 121 of the recess 12 and is difficult to penetrate deep into the recess 12 (toward the rear side when viewed from the outside). Moreover, since the backup material 10 according to the present embodiment has a bottom surface 121 that is inclined toward the rear as it goes upward, it is difficult for the sealing material 30 to penetrate deep into the upper part of the recess 12 .

In the backup material 10 according to the present embodiment, a part of the receiving surface 11 with which the sealing material 30 comes into contact has a recess 12 formed by being recessed. Therefore, even if the sealing material 30 receives pressure from the air expanded in the hollow part 41 due to a rise in temperature, the presence of the recess 12 on the back side (indoor side) of the sealing material 30 causes the sealing material 30 to remain in the recess 12. It becomes possible to expand to the back side while entering the inside. Therefore, the sealing material 30 is less likely to deform toward the front side (towards the outdoors), and the appearance of the wall is less likely to be impaired.

That is, in the conventional example shown in FIGS. 8B and 8C, since the back surface of the sealing material 30 is in full contact with the receiving surface 11, the sealing material 30 is exposed to pressure from the side (of the air expanded in the hollow part 41). When subjected to pressure (pressure), there was space for expansion only on the front side, and therefore, the sealing material 30 was easily deformed toward the front side (towards the outdoors). On the other hand, in the backup material 10 according to the present embodiment, since the recess 12 is formed in the receiving surface 11, the back surface of the sealing material 30 is unlikely to come into contact with the receiving surface 11 over the entire surface, and the sealing material Thirty inflatable spaces are formed. Therefore, when the sealing material 30 receives pressure from the side, the sealing material 30 can expand even on the back side, which is difficult to see from the outside, so that the sealing material 30 is less likely to deform toward the front side.

In addition, in the backup material 10 according to the present embodiment, the ventilation hole 13 formed above the recess 12 is less likely to be blocked by the sealing material 30, and the ventilation path from the hollow portion 41 to the ventilation hole 13 is easily secured. . Therefore, even if the air in the hollow part 41 expands, it is discharged from the opening at the end of the hollow part 41 through the gap 53 to the ventilation layer 52 formed between the back surface of the wall material 40 and the surface of the base 50. . Therefore, in the wall structure according to the present embodiment, the air in the hollow portion 41 is easily discharged to the ventilation hole 13 through the recess 12, the sealing material 30 is less likely to swell, and the appearance of the wall is less likely to be impaired.

Furthermore, when filling the joint 20 with the sealant 30 from the outdoor side, the sealing gun is moved downward from the upper end of the joint 20. Therefore, the sealing material 30 is filled into the joints 20 while being subjected to downward stress. However, in the backup material 10 according to the present embodiment, the ventilation holes 13 are located above the recesses 12 (near the upper part, that is, above the recesses 12). Even with the filling method of the sealant 30 as described above, it is difficult for the sealant 30 to reach the ventilation hole 13 and the ventilation hole 13 is difficult to be blocked by the sealant 30.

(Modified example)
The embodiment is only one of various embodiments of the invention. The embodiments can be modified in various ways depending on the design, etc., as long as the objective of the present disclosure can be achieved.

(Modification 1)
The backup material 10 according to Modification 1 is different from the backup material 10 of the above embodiment in the shape and size of the ventilation holes 13. Hereinafter, the same configurations as those in the embodiment will be given the same reference numerals and the description will be omitted as appropriate.

As shown in FIGS. 2A and 2B, the backup material 10 according to Modification 1 is formed so that the ventilation hole 13 extends above the recess 12 and above the bottom surface 121, which is an inclined surface. Therefore, compared to the embodiment described above, the opening area of the vent hole 13 is increased, and exhaust can be more smoothly carried out.

(Modification 2)
The backup material 10 according to Modification 2 is different from the backup material 10 of the above embodiment in the shape and size of the ventilation holes 13. Hereinafter, the same configurations as those in the embodiment will be given the same reference numerals and the description will be omitted as appropriate.

As shown in FIGS. 3A and 3B, in the backup material 10 according to Modification 2, the bottom surface 121 of the recess 12 is formed to be flat. The ventilation hole 13 is formed above the recess 12. In this case, the number of planes in contact with the sealing material 30 is larger than in the above embodiment, and the sealing material 30 can be sufficiently backed up.

(Modification 3)
The backup material 10 according to the third modification is different from the backup material 10 according to the second modification in the shape and size of the ventilation holes 13. Hereinafter, the same configurations as those in the embodiment will be given the same reference numerals and the description will be omitted as appropriate.

As shown in FIGS. 4A and 4B, the backup material 10 according to the third modification is formed such that the ventilation hole 13 extends above the recess 12 and above the bottom surface 121. Therefore, compared to the second modification described above, the opening area of the vent hole 13 is increased, and exhaust can be more smoothly carried out.

(Modification 4)
The backup material 10 according to Modification 4 has a different shape of the bottom surface 121 compared to the backup material 10 of the above embodiment. Hereinafter, the same configurations as those in the embodiment will be given the same reference numerals and the description will be omitted as appropriate.

As shown in FIGS. 5A and 5B, in the backup material 10 according to the fourth modification, the bottom surface 121 of the recess 12 is composed of a curved surface convexly curved toward the front side and a flat surface. The curved surface has a shape similar to the outer surface of a cannonball. Therefore, compared to the embodiments described above, both the exhaust from the ventilation holes 13 and the support of the sealing material 30 can be sufficiently performed.

Further, as shown in FIG. 5C, the bottom surface 121 of the recess 12 may be formed to be concavely curved toward the front side. In this case, a protruding portion corresponding to the recess 12 is formed on the back side of the receiving portion 103. Also in this modification, the ventilation hole 13 is formed above the bottom surface 121.

(summary)
As explained above, the backup material 10 according to the first aspect supports the sealing material 30 disposed at the joint 20 formed between adjacent wall materials 40. A part of the receiving surface 11 with which the sealing material 30 comes into contact has a recess 12 formed by being recessed. A ventilation hole 13 opening into the recess 12 is provided.

According to this aspect, even if the sealing material 30 is brought into contact with the receiving surface 11 and receives pressure from the air expanded within the hollow part 41 provided in the wall material 40, the recess 12 remains on the back side of the sealing material 30. This allows it to expand on the back side. Therefore, the sealing material 30 is less likely to deform to the front side, and the appearance of the wall is less likely to be impaired. Further, the sealing material 30 disposed at the joint 20 is less likely to fill the recess 12, and the ventilation hole 13 is less likely to be blocked by the sealing material 30. Therefore, when the wall material 40 has the hollow part 41, the air in the hollow part 41 is easily discharged to the ventilation hole 13 through the recess 12, the sealing material 30 is less likely to swell, and the appearance of the wall is less likely to be impaired. , there is an advantage.

In the backup material 10 according to the second aspect, in the first aspect, the bottom surface 121 of the recess 12 has at least one of a flat surface, an inclined surface, and a curved surface.

According to this aspect, the sealing material 30 placed at the joint 20 is less likely to be filled into the recess 12, and the air in the recess 12 flows more easily to the ventilation hole 13, so that the air in the hollow part 41 passes through the recess 12. This has the advantage that it can be easily discharged smoothly into the ventilation hole 13.

In the backup material 10 according to the third aspect, in the first or second aspect, the ventilation hole 13 is formed so as to be located above the recess 12 when placed in the joint 20.

According to this aspect, there is an advantage that the sealing material 30 disposed at the joint 20 is less likely to block the vent hole 13, and the discharge of air from the vent hole 13 is less likely to be impaired.

The backup material 10 according to the fourth aspect has a plurality of recesses 12 in any one of the first to third aspects.

According to this aspect, when the wall material 40 has a plurality of hollow parts 41, the air in the plurality of hollow parts 41 is easily discharged to the plurality of ventilation holes 13 through the plurality of recesses 12, and the sealing material 30 There is an advantage that swelling can be further reduced.

The wall structure according to the fifth aspect uses the backup material 10 of any one of the first to fourth aspects. A joint 20 is formed by disposing a plurality of wall materials 40 having hollow portions 41 adjacent to each other. The recess 12 is arranged in the joint 20 so that the position of the hollow part 41 and the position of the recess 12 correspond. The opening of the hollow part 41 in the joint 20 and the ventilation hole 13 are in communication.

According to this aspect, even if the sealing material 30 receives pressure from the air expanded in the hollow part 41 due to a rise in temperature, etc., the sealing material 30 can expand to the back side due to the recess 12 on the back side. . Therefore, the sealing material 30 is less likely to deform to the front side, and the appearance of the wall is less likely to be impaired. Further, the sealing material 30 disposed at the joint 20 is less likely to fill the recess 12, and the ventilation hole 13 is less likely to be blocked by the sealing material 30. Therefore, there is an advantage that the air in the hollow portion 41 is easily discharged to the ventilation hole 13 through the recess 12, and the swelling of the sealing material 30 can be reduced.

10 Backup material 11 Receiving surface 12 Recessed portion 121 Bottom surface 13 Ventilation hole 20 Joint 30 Sealing material 40 Wall material 41 Hollow portion

Claims (5)

A backup material that supports a sealant placed in a joint formed between horizontally adjacent wall materials,
The backup material is formed to be elongated and extends in the vertical direction, and includes a support part formed in a U-shape in cross section from a receiving part and two legs, and a fixing part that protrudes outward from the ends of the legs. and has a
The surface of the receiving part is formed as a receiving surface with which the sealing material comes into contact,
A part of the receiving surface is recessed toward the rear, and a plurality of recesses opening on the front surface and both side surfaces are formed in a line in the vertical direction,
The bottom surface of the recess is formed as an inclined surface such that the upper end is located further back than the lower end,
A ventilation hole penetrating the receiving part and opening into the recess is formed above the recess,
The recess is arranged so as to correspond to the opening of the hollow section that passes through the wall material in the horizontal direction when the backup material is placed at the joint, and the sealing material can expand at the recess. A space is formed, and the opening of the hollow part and the ventilation hole are configured to communicate through the space.
Backup material. A backup material that supports a sealant placed in a joint formed between horizontally adjacent wall materials,
The backup material is formed to be elongated and extends in the vertical direction, and includes a support part formed in a U-shape in cross section from a receiving part and two legs, and a fixing part that protrudes outward from the ends of the legs. and has a
The surface of the receiving part is formed as a receiving surface with which the sealing material comes into contact,
A part of the flat receiving surface is recessed toward the rear, and a plurality of recesses opening on the front surface and both side surfaces are formed in line in the vertical direction,
The bottom surface of the recess is formed as a flat surface,
A ventilation hole penetrating the receiving part and opening into the recess is formed above the recess,
The recess is arranged so as to correspond to the opening of the hollow section that passes through the wall material in the horizontal direction when the backup material is placed at the joint, and the sealing material can expand at the recess. A space is formed, and the opening of the hollow part and the ventilation hole are configured to communicate through the space.
Backup material. A backup material that supports a sealant placed in a joint formed between horizontally adjacent wall materials,
The backup material is formed to be elongated and extends in the vertical direction, and includes a support part formed in a U-shape in cross section from a receiving part and two legs, and a fixing part that protrudes outward from the ends of the legs. and has a
The surface of the receiving part is formed as a receiving surface with which the sealing material comes into contact,
A recess is formed in the receiving surface, and the recess has a bottom surface composed of a curved surface shaped like the outer surface of an upward-facing cannonball that is convex toward the front side, and a flat surface located above the curved surface. and both sides, and are formed in multiple lines in the vertical direction,
A ventilation hole penetrating the receiving part and opening into the recess is formed above the recess,
The recess is arranged so as to correspond to the opening of the hollow section that passes through the wall material in the horizontal direction when the backup material is placed at the joint, and the sealing material can expand at the recess. A space is formed, and the opening of the hollow part and the ventilation hole are configured to communicate through the space.
Backup material. A backup material that supports a sealant placed in a joint formed between horizontally adjacent wall materials,
The backup material is formed to be elongated and extends in the vertical direction, and includes a support part formed in a U-shape in cross section from a receiving part and two legs, and a fixing part that protrudes outward from the ends of the legs. and has a
The surface of the receiving part is formed as a receiving surface with which the sealing material comes into contact,
A part of the flat receiving surface is recessed toward the rear, and a plurality of recesses opening on the front surface and both side surfaces are formed in line in the vertical direction,
The bottom surface of the recess is configured with a curved surface concavely curved toward the front side,
A ventilation hole penetrating the receiving part and opening into the recess is formed above the recess,
The recess is arranged so as to correspond to the opening of the hollow section that passes through the wall material in the horizontal direction when the backup material is placed at the joint, and the sealing material can expand at the recess. A space is formed, and the opening of the hollow part and the ventilation hole are configured to communicate through the space.
Backup material. A wall structure using the backup material according to any one of claims 1 to 4,
A plurality of wall materials having hollow portions penetrating in the lateral direction are arranged adjacent to each other in the lateral direction to form the joint,
The recess of the backup material is arranged at the joint so that the position of the hollow part corresponds to the position of the recess,
A space in which the sealing material can expand is formed at the recess, and the opening of the hollow part in the wall material and the ventilation hole communicate with each other via the space.
wall structure.

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