JP7484645B2 - Joint side forming member, joint structure, and extension method - Google Patents

Description

The present invention relates to a joint side forming member that forms the side of a joint where exterior materials of different thicknesses are arranged adjacently, a joint structure using said joint side forming member, and an extension method that uses said joint structure to maintain waterproofing between an existing building and an extension.

Traditionally, joints have been formed between adjacent exterior materials to absorb displacement of the exterior wall. These joints are filled with wet or dry joint material, which primarily maintains the watertightness of the joint. In order to maintain the watertightness of the joint using the joint material, the length of the joint side in the indoor and outdoor directions with which the joint material is in contact is required.

Exterior walls are usually made of exterior materials of the same thickness, but for example, Patent Document 1 proposes using exterior materials of different thicknesses to change the texture of the building exterior. Also, Patent Document 2 describes an invention in which, when the exterior material becomes too thin to adequately hold the joint material, a notch groove is provided in the wooden base material of the exterior wall, and dry joint material is inserted into the notch groove to hold the joint material and maintain the watertightness of the joint.

JP 2000-257239 A JP 2001-336228 A

However, in the case of a joint structure like that of Patent Document 1, the joint is formed with exterior materials that are thick on one side and relatively thin on the other. However, even a thin exterior material needs to be thick enough to at least adequately seal the sides of the joint material, so when a thinner exterior material is used to form the joint, sufficient watertightness cannot be maintained. In addition, a joint structure like that of Patent Document 2 cannot be used in exterior walls that do not have a wooden base material placed behind the joint.

The present invention aims to provide a joint side forming member, a joint structure, and an extension method that utilizes said joint structure, which can adequately hold the joint material and maintain the watertightness of the joint even in joints where one of the exterior materials is thinly formed.

The first joint side forming member of the present invention is a joint side forming member that forms the side of the first exterior wall panel side of a vertical joint formed between a first exterior facing panel having a first exterior facing material that forms the exterior wall of a building and a first frame body provided on the back surface of the first exterior facing material, a second exterior facing panel that is thicker than the first exterior facing material, and a second frame body provided on the back surface of the second exterior facing material, and is a joint side forming member that forms the side of the first exterior wall panel side of a vertical joint formed between the first exterior facing panel and a second exterior facing panel that is arranged adjacent to the first exterior facing panel, and is characterized in that it has a fixed base that is fixed to the first frame body, and a side portion that is supported by the fixed base and extends from the indoor side edge of the surface of the first exterior facing material that faces the vertical joint in the indoor direction, and the indoor side edge of the side portion extends to a position equal to the indoor side edge of the surface of the second exterior facing material that faces the vertical joint in the indoor/outdoor direction.

The second joint side forming member of the present invention further comprises a connecting portion connecting the fixed base and the side portion, the first frame body is formed in a groove shape that opens toward the vertical joint, the fixed base is flat and fixed to the bottom surface of the first frame body, the connecting portion is formed by bending from the fixed base and is formed at an angle to the first exterior surface material, extending toward the indoor edge of the surface of the first exterior surface material that faces the vertical joint, and the side portion is formed by bending from the tip of the connecting portion and extending toward the indoor direction.

The first joint structure of the present invention is characterized by comprising a first exterior wall panel having a first exterior facing material and a first frame body provided on the back surface of the first exterior facing material, a second exterior wall panel having a second exterior facing material thicker than the first exterior facing material and a second frame body provided on the back surface of the second exterior facing material and disposed adjacent to the first exterior wall panel, a first joint side forming member or a second joint side forming member, and a joint material filled between the surface of the second exterior facing material facing the vertical joint and the side portion.

The extension method of the present invention is an extension method for constructing a new exterior wall by providing a first joint structure, and is characterized by including the steps of forming the framework of the extension section adjacent to the framework of the existing building, placing the new second exterior wall panel adjacent to the first exterior wall panel of the existing building and fixing it to the framework of the extension section, fixing a first joint side forming member or a second joint side forming member to the side of the first exterior wall panel adjacent to the second exterior wall panel, and filling the gap between the surface of the second exterior surface material facing the vertical joint and the side portion with the joint material.

According to the first joint side forming member of the present invention, the joint side forming member is a member that forms the side of the first exterior wall panel side of the vertical joint formed between the first exterior wall panel and the second exterior wall panel. The first exterior surface material of the first exterior wall panel and the second exterior surface material of the second exterior wall panel have different thicknesses, and the first exterior surface material is formed thinner than the second exterior surface material. As a result, when the joint material is filled, the contact area between the joint material and the first exterior surface material is smaller than the contact area between the joint material and the second exterior surface material. Therefore, since the indoor side edge of the side portion of the joint side forming member extends to a position equal to the indoor side edge of the surface of the second exterior surface material facing the vertical joint in the indoor/outdoor direction, by filling the joint material between the side portion of the joint side forming member and the surface of the second exterior surface material facing the vertical joint, the thinness of the first exterior surface material can be compensated for, and the vertical joint can be kept sufficiently watertight.

According to the second joint side forming member of the present invention, the joint side forming member is formed of a flat fixed base, a connecting portion formed by bending from the fixed base, and a side portion formed by bending from the tip of the connecting portion, and can be formed by bending a single flat plate. The connecting portion of the joint side forming member is formed by bending from the fixed base, and is formed at an angle to the first exterior facing material, extending toward the indoor side edge of the surface of the first exterior facing material that faces the vertical joint. Because the connecting portion is provided at an angle to the first exterior facing material, there is no interference between the connecting portion and the head of a screw or rivet used to join one side panel of the first frame body and the back surface of the first exterior facing material.

According to the joint structure of the present invention, the side of the vertical joint on the side of the first exterior wall panel is extended toward the interior using any of the joint side forming members described above, and the joint material is filled between the surface of the second exterior facing material facing the vertical joint and the side portion of the joint side forming member. Therefore, even if the first exterior facing material is thin and the side of the joint material cannot be sufficiently adhered, the thinness of the first exterior facing material can be compensated for and the vertical joint can be kept sufficiently watertight.

According to the extension method of the present invention, a second exterior wall panel is newly placed adjacent to the first exterior wall panel of the existing building and fixed to the framework of the extension, a joint side forming member is fixed to the side of the first exterior wall panel adjacent to the second exterior wall panel, and joint material is filled between the surface of the second exterior facing material facing the vertical joint and the side portion, so that even if the existing first exterior wall panel is thin, the waterproof performance of the vertical joint that forms the boundary with the extension can be sufficient.

A diagram showing the exterior shape of the building after the extension. FIG. 4 is a horizontal cross-sectional view illustrating a vertical joint before a joint side forming member is placed. FIG. 4 is a horizontal cross-sectional view illustrating a vertical joint with a joint side forming member attached. A diagram showing the dimensions of each part of a vertical joint. FIG. FIG. 2 is a horizontal cross-sectional view illustrating a vertical joint with a dry joint material pressed in. FIG. 2 is a horizontal cross-sectional view illustrating a vertical joint filled with a wet joint material.

The following describes an embodiment of the joint side forming member 1, joint structure 2, and extension method according to the present invention with reference to the drawings. The joint structure 2 of this embodiment is, as shown in FIG. 1, an exterior wall joint joint structure 2 formed at the boundary between an existing building 4 and an extension part 5 when an extension part 5 is added to an existing building 4, and a joint side forming member 1 used in the joint structure 2. As shown in FIG. 2, the existing building 4 is, for example, a lightweight steel frame structure in which a structural body 8 is formed by binding together a rectangular frame 9, and the exterior wall surface is formed by fixing a first exterior wall panel 6 to the structural body 8. In addition, the extension part 5 has an exterior wall surface formed by fixing a second exterior wall panel 7 to a new structural body 8 formed by joining to the structural body 8 of the existing building 4.

As shown in Figures 6 and 7, the joint structure 2 is a structure that includes a first exterior wall panel 6 having a first exterior facing material 10 and a first frame body 11 provided on the back surface of the first exterior facing material 10, a second exterior facing material 12 that is thicker than the first exterior facing material 10, and a second frame body 13 provided on the back surface of the second exterior facing material 12, a second exterior wall panel 7 that is arranged adjacent to the first exterior wall panel 6, a joint side forming member 1 that supplements the side surface of the vertical joint 3 on the first exterior facing material 10 side and forms the side surface of the first exterior wall panel 6, and joint materials 14a, 14b that are filled between the surface of the second exterior facing material 12 facing the vertical joint 3 and the side surface formed by the joint side forming member 1.

As shown in Figures 2 and 3, the first exterior wall panel 6 is an exterior wall panel of an old specification used for an existing building 4. The first exterior wall panel 6 has a first exterior surface material 10 that forms the exterior wall surface of the building, a rectangular first frame body 11 provided on the back surface of the first exterior surface material 10, and a back plate 15 that forms the indoor surface of the first exterior wall panel 6, and a polystyrene insulation material 16 is stored inside. The first exterior surface material 10 is a thin plate material, for example, about 4 mm thick, with a design pattern and paint applied to the surface. The first frame body 11 and the insulation material 16 are formed to a thickness of about 30 mm in the outward direction of the first exterior wall panel 6, and the back plate 15 is formed to a thickness of about 4 mm. The first frame body 11 is formed in a groove shape along the periphery of the first exterior wall panel 6, and is formed to open outward in the inward direction of the first exterior wall panel 6. The first frame 11 has a bottom plate 11a that abuts against the insulation material 24, an outdoor side plate 11b that abuts against and is fixed to the first exterior facing material 10, and an indoor side plate 11c that abuts against and is fixed to the back plate 15. The first frame 11 is fixed by driving rivets from the outdoor side plate 11b of the first exterior facing material 10 to the first exterior facing material 10, and the rivet heads 16 are exposed to the inside of the first frame 11.

As shown in Figs. 2 to 4, the second exterior wall panel 7 is an exterior wall panel of current specifications to be used in a building to be newly expanded. The second exterior wall panel 7 has a second exterior surface material 12 that is thicker than the first exterior surface material 10, and a rectangular second frame body 13 provided on the back surface of the second exterior surface material 12. The second exterior surface material 12 is a surface material that is formed, for example, with a textured pattern and paint on the surface and has a thickness of at least 10 mm. The second exterior surface material 12 needs to have a thickness α of at least 10 mm on the side that forms the joint, and for example, when a chamfered portion 17 of about 2 mm is formed in the thickness direction on the outer peripheral edge on the outdoor side, the thickness of the second exterior surface material 12 is at least 12 mm. The second frame body 13 is formed so that the thickness in the out-of-plane direction of the second exterior wall panel 7 is, for example, about the same as the thickness of the second exterior surface material 12. It is preferable that the overall thickness of the second exterior wall panel 7, including the second exterior facing material 12 and the second frame body 13, is equal to the thickness of the first exterior wall panel 6, including the first exterior facing material 10 and the first frame body 11. The second frame body 13 is groove-shaped and formed along the periphery of the second exterior wall panel 7, and is formed to open outward in the in-plane direction of the second exterior wall panel 7.

As shown in FIG. 2, the first exterior wall panel 6 and the second exterior wall panel 7 are attached to a frame 9 that constitutes the structural frame 8 of the building. The frame 9 is formed into a rectangular frame shape using C-shaped steel that opens on the inside. Adjacent frame parts 9 are connected to each other with horizontal bolts 18, and the first frame body 11 of the first exterior wall panel 6 and the second frame body 13 of the second exterior wall panel 7 are engaged and fixed by exterior wall mounting hardware 19 inserted between the adjacent frame parts 9.

As shown in FIG. 4, a gap δ of, for example, 11 mm is formed between the first exterior wall panel 6 and the second exterior wall panel 7 adjacent to each other, and this gap δ is the vertical joint 3. As shown in FIG. 2, the first exterior facing material 10 is thinner than the second exterior facing material 12, so the surface β of the first exterior facing material 10 facing the vertical joint 3 is formed shorter in the depth direction of the joint than the surface α of the second exterior facing material 12 facing the vertical joint 3. Therefore, when filling the vertical joint 3 with the joint materials 14a and 14b, the side of the vertical joint 3 formed by the first exterior facing material 10 is short, and the area of contact between the joint materials 14a and 14b and the first exterior facing material 10 is short, so that the joint materials 14a and 14b cannot be filled appropriately.

As shown in Figures 3 and 5, the joint side forming member 1 supplements the side of the vertical joint 3 on the first exterior facing material 10 side to form the side of the first exterior wall panel 6. The joint side forming member 1 includes a fixed base 20 fixed to the first frame 11, a side portion 21 supported by the fixed base 20 and extending from the indoor side edge of the surface of the first exterior facing material 10 facing the vertical joint 3 toward the interior, and a connecting portion 22 connecting the fixed base 20 and the side portion 21. The fixed base 20 is flat and abuts against the bottom plate 11a of the first frame 11 and is fixed with fixing screws 23.

As shown in Figures 3 and 4, the side portion 21 is arranged such that its outdoor end is close to the indoor edge of the surface facing the vertical joint 3 of the first exterior surface material 10, and its indoor end is formed to extend to a position equal to the indoor/outdoor direction on the indoor edge of the surface facing the vertical joint 3 of the second exterior surface material 12. In this embodiment, the indoor/outdoor length γ of the side portion 21 is 11.5 mm. Note that the indoor/outdoor length γ of the side portion 21 must be at least 10 mm or more. The vertical length of the side portion 21 is equal to the vertical lengths of the first exterior surface material 10 and the second exterior surface material 12.

The connecting portion 22 is bent from the fixed base 20 and is formed at an angle to the first exterior surface material 10, extending toward the indoor edge of the surface of the first exterior surface material 10 facing the vertical joint 3. The side surface portion 21 is formed by bending from the tip of the connecting portion 22 and extending toward the indoor direction. In this way, the joint side forming member 1 is formed of the fixed base 20, the connecting portion 22 formed by bending from the fixed base 20, and the side surface portion 21 formed by bending from the tip of the connecting portion 22, so it can be formed by bending a single metal plate. And, since the connecting portion 22 of the joint side forming member 1 is provided at an angle to the first exterior surface material 10, it is possible to prevent the rivet head 16 used to join one side plate of the first frame body 11 and the back surface of the first exterior surface material 10 from interfering with the connecting portion 22.

As shown in FIG. 6, the joint materials 14a and 14b filled in the vertical joint 3 are, for example, dry joint material 14a. Dry joint material 14a is a resin gasket that has elasticity and is pressed into the vertical joint 3 to make the vertical joint 3 waterproof. Dry joint material 14a is formed such that the length in the joint width direction is longer than the width of the vertical joint 3 before being inserted into the vertical joint 3, and when pressed into the vertical joint 3, it elastically deforms and adheres closely to both side surfaces of the vertical joint 3. In this embodiment, in order to ensure the watertightness of the vertical joint 3, both side surfaces of the vertical joint 3 are flat surfaces with a length in the depth direction of 10 mm or more, and both side surfaces of dry joint material 14a need to abut against both side surfaces of the vertical joint 3.

A joint clip material 23 is inserted into the back of the vertical joint 3. The joint clip material 23 is a positioning material that positions the joint material 14a when it is pressed in and prevents the joint material 14a from falling off to the indoor side of the first exterior surface material 10. A receiving groove is formed in the center of the joint clip material 23, and a convex portion formed on the indoor side tip of the dry joint material 14a is fitted into the receiving groove, thereby holding the joint material 14a in an appropriate position. Then, one side of the joint material 14a abuts against the side portion 21 of the joint side forming member 1, and the other side of the joint material 14a is pressed into the vertical joint 3 so that it abuts against the side surface of the second exterior surface material 12 facing the vertical joint 3. At this time, the side portion 21 of the joint side forming member 1 has a length in the depth direction of the joint of 10 mm or more, and the length in the depth direction of the joint of the side facing the vertical joint 3 of the second exterior surface material 12 is also 10 mm or more, so that both sides of the joint material 14a can abut against a flat surface with a length in the depth direction of 10 mm or more, ensuring the watertightness of the vertical joint 3.

The joint materials 14a and 14b filled in the vertical joints 3 are not limited to the dry joint material 14a, and as shown in FIG. 7, a wet joint material 14b may be used. The wet joint material 14b fills the vertical joints 3 with a highly viscous liquid resin and hardens it within the vertical joints 3 to make the vertical joints 3 waterproof. In order for the wet joint material 14b to ensure the watertightness of the vertical joints 3, both sides of the vertical joints 3 must be flat surfaces with a depth length of 10 mm or more, and the wet joint material 14b must be adhered to both sides of the vertical joints 3.

A joint backup material 26 is inserted into the back of the vertical joint 3. The joint backup material 26 is a backup material for preventing the wet joint material 14b from falling off the indoor side of the first exterior wall panel 6 and the second exterior wall panel 7 when the wet joint material 14b is filled, and for filling the joint material 14b evenly and sufficiently. The wet joint material 14b is filled into the groove formed by the joint backup material 26, the side portion 21 of the joint side forming member 1, and the side surface facing the vertical joint 3 of the second exterior wall surface material, thereby waterproofing the vertical joint 3. At this time, the side portion 21 of the joint side forming member 1 has a length in the depth direction of the joint of 10 mm or more, and the length in the depth direction of the joint of the side surface facing the vertical joint 3 of the second exterior surface material 12 is also 10 mm or more, so that the wet joint material 14b can be filled to a thickness of 10 mm or more, and the watertightness of the vertical joint 3 can be ensured for a long period of time.

When extending a building, first, the structural frame 8 of the extension section 5 is formed adjacent to the structural frame 8 of the existing building 4. At this time, the first exterior wall panel 6 of the existing building 4 is not removed from the structural frame 8 for the portion that will remain as an exterior wall after the extension. Then, as shown in FIG. 2, an exterior wall mounting hardware 19 is installed at a position where the frame 9 of the existing building 4 and the frame 9 of the extension section 5 are adjacent to each other, and a second exterior wall panel 7 is newly placed adjacent to the first exterior wall panel 6 of the existing building 4, and the second frame 13 of the second exterior wall panel 7 is engaged with the exterior wall mounting hardware 19 to fix the second exterior wall panel 7 to the structural frame 8 of the extension section 5. Then, as shown in FIG. 3, the fixing base 20 of the joint side forming member 1 is abutted against the bottom plate 11a of the first frame 11 on the side adjacent to the second exterior wall panel 7 of the first exterior wall panel 6, and fixed with a fixing screw 23 to form a vertical joint 3. Then, as shown in FIG. 6, in the case of dry joint material 14a, a joint clip material 23 is inserted between the surface of second exterior facing material 12 facing vertical joint 3 and the side portion 21 of joint side forming member 1, and dry joint material 14a is pressed into the vertical joint 3 to complete the exterior wall. In the case of wet joint material 14b, as shown in FIG. 7, a joint backup material 26 is inserted between the surface of second exterior facing material 12 facing vertical joint 3 and the side portion 21 of joint side forming member 1, and wet joint material 14b is filled into the vertical joint 3 and hardened to complete the exterior wall.

In this way, the joint materials 14a, 14b are filled between the surface of the second exterior surface material 12 facing the vertical joint 3 and the side portion 21. Even if the existing first exterior wall panel 6 is thin and the waterproof performance of the joint materials 14a, 14b cannot be fully demonstrated, the side of the vertical joint 3 is formed by the side portion 21 of the joint side forming member 1, so the waterproof performance of the vertical joint 3, which is the boundary between the existing building 4 and the extension 5, can be sufficiently ensured.

It goes without saying that the embodiment of the present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate without departing from the scope of the concept of the present invention.

The joint side forming member 1, joint structure 2, and expansion method of the present invention are suitable as joint side forming member 1, joint structure 2, and expansion method that can ensure the watertightness of the vertical joint 3 when the exterior surface material of the existing exterior wall panel and the exterior surface material of the newly installed exterior wall panel have different thicknesses.

REFERENCE SIGNS LIST 1 Joint side forming member 2 Joint structure 3 Vertical joint 4 Existing building 5 Extension 6 First exterior wall panel 7 Second exterior wall panel 10 First exterior facing material 11 First frame 12 Second exterior facing material 13 Second frame 14a Joint material (dry type)
14b Joint material (wet type)
20 Fixed base portion 21 Side portion 22 Connection portion

Claims (4)

A joint side forming member that forms a side surface on the first exterior wall panel side of a vertical joint formed between a first exterior wall panel having a first exterior facing material that forms an exterior wall of a building and a first frame body provided on the back surface of the first exterior facing material, and a second exterior wall panel that has a second exterior facing material that is thicker than the first exterior facing material and a second frame body provided on the back surface of the second exterior facing material and is disposed adjacent to the first exterior wall panel,
A fixed base portion fixed to the first frame body;
A side surface portion supported by the fixed base and extending toward the interior from an indoor end edge of a surface of the first exterior surface material facing the vertical joint;
Equipped with
A joint side forming member characterized in that the indoor side edge of the side portion extends to a position equal in the indoor/outdoor direction to the indoor side edge of the surface of the second exterior surface material that faces the vertical joint. A connecting portion is further provided to connect the fixed base portion and the side surface portion,
The first frame is formed in a groove shape that opens toward the vertical joint, and one side plate is fixed to the back surface of the first exterior surface material,
The fixed base is flat and fixed to a bottom surface of the first frame,
The connecting portion is bent from the fixed base portion and is formed at an angle to the first exterior surface material, and extends toward an indoor edge of a surface of the first exterior surface material facing the vertical joint,
The joint side forming member according to claim 1 , wherein the side portion is bent from a tip of the connecting portion and extended toward an interior of the building. A first exterior wall panel having a first exterior facing material and a first frame body provided on a back surface of the first exterior facing material;
A second exterior wall panel having a second exterior surface material thicker than the first exterior surface material and a second frame body provided on a back surface of the second exterior surface material, the second exterior wall panel being disposed adjacent to the first exterior wall panel;
The joint side forming member according to claim 1 or 2,
A joint material is filled between a surface of the second exterior surface material facing the vertical joint and the side surface portion;
A joint structure comprising: A method for constructing a new exterior wall by providing the joint structure according to claim 3,
forming a structure for an extension adjacent to the structure of an existing building;
a step of newly disposing the second exterior wall panel adjacent to the first exterior wall panel of the existing building and fixing the second exterior wall panel to a framework of the extension;
A step of fixing the joint side forming member according to claim 1 or 2 to a side of the first exterior wall panel adjacent to the second exterior wall panel;
A step of filling the joint material between a surface of the second exterior surface material facing the vertical joint and the side surface portion;
A method for extension comprising the steps of:

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