Airtight layer construction method

Abstract

To efficiently attach an object to a corner of a building where an airtight layer is formed. [Solution] A surface material structure SC is prepared, which includes a floor underlayment 4 having a lower surface 4a and an airtight member 5 having an inner surface 5a arranged so as to abut against the lower surface 4a, and a liquid adhesive for forming an airtight layer 9 is applied over the lower surface 4a and the inner surface 5a at least at the corner portion C1 where the lower surface 4a and the inner surface 5a intersect, and an airtight auxiliary device 6 attached to the surface material structure SC is adhered to at least one of the lower surface 4a and the inner surface 5a via the liquid adhesive.

Description

[Technical Field]

[0001] The present invention relates to a method for applying an airtight layer in a building. [Background technology]

[0002] In buildings having two facings that form a corner, an airtight layer may be formed to ensure airtightness between the facings. For example, Patent Document 1 below discloses that a seamless airtight layer (moisture-proof layer) is formed at the corner (inner corner or outer corner) formed at the joint of various facings such as a wall, floor, and ceiling by spraying an emulsion of acrylic resin or the like with a spray gun.

[0003] Furthermore, some kind of attachment object may be attached to the above-mentioned corner portion. For example, Patent Document 2 below discloses that a connecting plate is fixed to the corner portion between the wall portion and the structural slab of a building to enhance earthquake resistance. The connecting plate is fixed to the wall portion and the structural slab that constitute the corner portion using fastening members such as screws and bolts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-185128 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-190300 Summary of the Invention [Problem to be solved by the invention]

[0005] To ensure airtightness at corners where a joining plate such as that in Patent Document 2 is attached, it is conceivable to form an airtight layer using the method in Patent Document 1. In this case, it is conceivable to first spray emulsion onto the corners to form an airtight layer, and then fasten the joining plate to the corners using fastening members. However, this method requires that the formation of the airtight layer and the attachment of the joining plate (the attachment object) be performed in completely separate processes, leaving room for improvement in terms of work efficiency.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a construction method that allows for efficient attachment of attachment objects to corners of buildings where airtight layers are formed. [Means for solving the problem]

[0007] In order to solve the above problems, a first invention is a method for constructing an airtight layer in a building, which comprises preparing a panel structure including a first panel having a first inner surface facing the interior side of the room, and a second panel arranged so as to abut against the first inner surface of the first panel and having a second inner surface facing the interior side of the room, applying a liquid adhesive for forming an airtight layer over the first inner surface and the second inner surface at least at a corner where the first inner surface and the second inner surface intersect, and adhering an object to be attached to the panel structure to at least one of the first inner surface and the second inner surface via the liquid adhesive. The object is bonded in a state where the object is spaced apart from the intersection of the first inner surface and the second inner surface. , is something.

[0008] According to the first invention, a liquid adhesive is applied to a panel structure (first panel and second panel) that forms a corner where a first inner surface and a second inner surface intersect, covering both the first inner surface and the second inner surface. As the liquid adhesive hardens, an airtight layer that provides an airtight seal between the first panel and the second panel is formed. Furthermore, the liquid adhesive applied to form the airtight layer is used to bond an attachment to at least one of the first inner surface and the second inner surface. This allows for the attachment of the attachment to be performed quickly following the application of the liquid adhesive, and eliminates the need for dedicated fasteners (e.g., screws, bolts, etc.) to secure the attachment. This allows for efficient attachment of the attachment to the corner where an airtight layer is formed.

[0010] Also Since the attachment object is adhered away from the intersection of the first inner surface and the second inner surface, which is important for forming the airtight layer, the amount of liquid adhesive applied to the intersection can be maintained, and the attachment object can be attached to the corner portion while ensuring good airtightness.

[0011] Second Invention teeth, First Invention In preparing the panel structure, the panel structure is prepared to have the first panel arranged with the first inner surface facing downward to form a ceiling.

[0012] Second Invention According to this, an airtight layer can be easily applied to corners at high altitudes. That is, when the first panel constitutes a downward-facing ceiling surface, the work of forming the airtight layer between this first panel and the second panel is done at high altitudes, but because the airtight layer can be formed by applying the above-mentioned liquid adhesive, the airtight layer can be applied relatively easily even at high altitudes.

[0013] Third Invention teeth, First or second invention In the bonding of the attachment object in the above, the attachment object is bonded to the first inner surface to restrict movement of the second surface material toward the interior side of the room.

[0014] Third Invention According to the present invention, the second face material can be positioned in a desired position while simplifying the attachment of the second face material. For example, the second face material may be attached by a simple method such as fitting it adjacent to the first face material. Even in such cases, the attachment object is adhered as a member for restricting the movement of the second face material, so the second face material can be positioned in a desired position and the attachment position of the second face material can be stabilized. [Effects of the Invention]

[0015] As described above, according to the airtight layer construction method of the present invention, it is possible to efficiently attach an object to be attached to the corner of a building on which an airtight layer is formed. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a side cross-sectional view of a building to which a construction method according to an embodiment of the present invention is applied. [Figure 2] FIG. [Figure 3] FIG. 2 is an enlarged side cross-sectional view of a part of FIG. [Figure 4] FIG. 2 is a perspective view showing the airtightness aid alone. [Figure 5] FIG. 10 is a side cross-sectional view showing the application of liquid adhesive to the corners of the surface material structure. [Figure 6] FIG. 10 is a side cross-sectional view showing the state in which the airtightness aid is adhered using the applied liquid adhesive. [Figure 7] FIG. 4 is a view equivalent to FIG. 3, showing a modification of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the following embodiments are examples that embody the present invention and are not intended to limit the technical scope of the present invention.

[0018] [Building structure] 1 is a side cross-sectional view of a building 1 to which a construction method according to one embodiment of the present invention is applied. As shown in this figure, the building 1 includes a perimeter beam 2, an exterior wall 3, a floor underlayment 4, an airtight member 5, an airtight auxiliary device 6, and a ceiling structure 7.

[0019] The perimeter beams 2 are structural members that extend horizontally along the perimeter of the building 1, and are positioned at a height corresponding to the ceilings of the lower floors. The perimeter beams 2 are supported on foundations (not shown) that are cast into the ground via columns and the like that are arranged horizontally at a predetermined pitch. The perimeter beams 2 are made of H-shaped steel that has a pair of upper and lower flanges 21 and a web 22 that connects the centers of both flanges 21 together.

[0020] A soft heat insulating material 23 is attached between both flanges 21 of the outer perimeter beam 2. The heat insulating material 23 is made of, for example, glass wool.

[0021] The exterior wall 3 comprises an exterior wall panel 31 that forms the outermost periphery of the building 1, an under-beam insulation material 32 provided inside the exterior wall panel 31, and a soft insulation material 33 provided between the exterior wall panel 31 and the under-beam insulation material 32.

[0022] The upper part of the exterior wall panel 31 is fixed to the lower flange 21 of the outer perimeter beam 2 via a mounting bracket 31a. The lower part of the exterior wall panel 31 is fixed to the foundation via a similar mounting bracket (not shown).

[0023] The under-beam insulation material 32 is disposed below the peripheral beams 2. Specifically, the under-beam insulation material 32 is sandwiched between the flange 21 on the lower side of the peripheral beams 2 and the foundation, and is fixed in a state where it is positioned relative to the flange 21 by a predetermined positioning member or the like. The under-beam insulation material 32 is a hard insulation material made of, for example, urethane foam or the like.

[0024] The soft insulation material 33 is arranged below the perimeter beams 2 so as to follow the outer surface of the under-beam insulation material 32. The soft insulation material 33 is fixed to the lower flange 21 of the perimeter beams 2 at a distance from the exterior wall panel 31 to form a ventilation passage between the soft insulation material 33 and the exterior wall panel 31. The soft insulation material 33 is made of, for example, glass wool. Note that the soft insulation material 33 is not essential and may be omitted.

[0025] The underfloor material 4 is a structure that constitutes the floor of the upper floor (the second floor in this embodiment), and its peripheral edge is supported by the perimeter beams 2. The underfloor material 4 includes a floor surface material placed on the perimeter beams 2. In this embodiment, the floor surface material is made of, for example, lightweight aerated concrete such as ALC.

[0026] The ceiling structure 7 comprises hanging bolts 71 fixed in a suspended state to the underfloor material 4 or beams (not shown), joist supports 72 extending horizontally (a direction perpendicular to the plane of the paper in FIG. 1) and fixed to the lower ends of the hanging bolts 71, joist supports 73 extending in a direction perpendicular to the joist supports 72 (the left-right direction in FIG. 1) and fixed to the joist supports 72, and ceiling panels 74 fixed to the undersides of the joist supports 73. The ceiling panels 74 are boards that make up the ceiling surface of the lower floor (the first floor in this embodiment), and are arranged to extend horizontally at a height below the outer perimeter beams 2.

[0027] The airtight member 5 is a member for ensuring airtightness between the exterior wall 3 and the underfloor material 4, and is arranged on the indoor side of the outer perimeter beam 2. The airtight member 5 comprises a panel-shaped beam crossing heat material 51 arranged so as to be sandwiched between the underside 4a of the underfloor material 4 and the upper surface 32a of the under-beam insulation material 32, and an airtight sheet 52 covering the beam crossing heat material 51. The beam crossing heat material 51 is a hard heat insulating material made of, for example, urethane foam. The airtight sheet 52 is a flexible sheet made of a thermoplastic resin such as polyethylene, polypropylene, or polyvinyl chloride.

[0028] 2 is a side view of the airtight member 5. As shown in this figure, the beam-crossing thermal material 51 has an upper surface 51a facing the lower surface 4a of the underfloor material 4, an inner surface 51b perpendicular to the upper surface 51a and facing the indoor side, and an outer surface 51c facing the opposite side of the inner surface 51b.

[0029] The airtight sheet 52 has a clamped portion 52a that is clamped between the underside 4a of the floor underlayment 4 and the upper surface 51a of the beam-crossing heat material 51, an extending portion 52b that covers the inner surface 51b of the beam-crossing heat material 51 and extends below the beam-crossing heat material 51, and a fixed portion 52c that is fixed to the outer surface 51c of the beam-crossing heat material 51 while covering a portion of the upper side of the outer surface 51c of the beam-crossing heat material 51.

[0030] 1, the extension portion 52b has a length in the vertical direction that is sufficient to cover the entire vertical surface of the inner surface 51b of the beam crossing heat material 51 and the entire vertical surface of the inner surface 32b of the beam under-insulation material 32. This makes it possible to prevent humid indoor air from entering the beam crossing heat material 51 and the beam under-insulation material 32 in situations where the indoor temperature is higher than the outdoor temperature, such as in winter.

[0031] FIG. 3 is a side cross-sectional view of an enlarged portion of FIG. 1. As shown in this figure, a corner portion C1 is formed at the interface between the underfloor material 4 and the airtight member 5. The corner portion C1 is an internal corner formed by the horizontal lower surface 4a of the underfloor material 4 and the vertical inner surface 5a of the airtight member 5. That is, a surface material structure SC having a corner portion C1 (internal corner portion) is formed by the underfloor material 4 having the lower surface 4a facing the interior side of the room and the airtight member 5 arranged to abut against the lower surface 4a and having the inner surface 5a facing the interior side of the room. In this case, the underfloor material 4 corresponds to an example of the "first surface material" of the present invention, and the lower surface 4a of the underfloor material 4 corresponds to an example of the "first inner surface" of the present invention. Furthermore, the airtight member 5 corresponds to an example of the "second surface material" of the present invention, and the inner surface 5a of the airtight member 5 corresponds to an example of the "second inner surface" of the present invention.

[0032] An airtight layer 9 is formed at the corner portion C1 of the surface material structure SC. The airtight layer 9 is formed by natural hardening of a liquid adhesive 100 (Fig. 5), and has a horizontal portion 91 formed on the underside 4a of the floor underlayment 4 and a vertical portion 92 formed on the inner surface 5a of the airtight member 5. The inner surface 5a of the airtight member 5 is synonymous with the surface of the extension portion 52b of the airtight sheet 52 covering the inner surface 51b of the beam-crossing thermal material 51.

[0033] The horizontal portion 91 and vertical portion 92 of the airtight layer 9 are continuous at the intersection X1 of the surface material structure SC, that is, the intersection X1 where the underside 4a of the underfloor material 4 and the inner surface 5a of the airtight member 5 intersect (are perpendicular to each other). This causes the intersection X1 to be sealed by the airtight layer 9, preventing air from passing through the gap between the underfloor material 4 and the airtight member 5. In other words, the airtight layer 9 has the function of airtightly sealing the gap between the underfloor material 4 and the airtight member 5.

[0034] The airtightness aid 6 functions as a fall prevention device to prevent the airtightness member 5 (beam-crossing heat-insulating material 51) from falling toward the interior of the room and is attached to the corner portion C1. FIG. 4 is a perspective view showing the airtightness aid 6 alone. As shown in FIGS. 3 and 4, the airtightness aid 6 has a base portion 61 fixed to the underside 4a of the floor underlayment 4 via a horizontal portion 91 of the airtight layer 9, and an extension portion 62 extending diagonally downward from an inner end 61b, which is the end of the base portion 61 opposite the airtightness member 5 (indoor side), toward the airtightness member 5. The width dimension W of the airtightness aid 6 shown in FIG. 4, in other words, the dimension of the airtightness aid 6 in a direction perpendicular to the plane of FIG. 3, is smaller than the dimension of the airtightness member 5 in the same direction. The airtightness aid 6 corresponds to an example of the "object to be attached" in the present invention.

[0035] 3, the outer end 61a of the base portion 61, which is the end portion closer to the airtight member 5, is located near the intersection X1 between the undersurface 4a of the underfloor material 4 and the inner surface 5a of the airtight member 5. However, the outer end 61a of the base portion 61 does not contact the intersection X1, but is spaced a distance L1 from the intersection X1.

[0036] The lower end 62a of the extension portion 62 is located near the inner surface 5a of the airtight member 5. The position of the lower end 62a of the extension portion 62 in a direction perpendicular to the inner surface 5a is approximately the same as the position of the outer end 61a of the base portion 61 in the same direction. Although the positions of the two may be completely the same, in this embodiment, the extension portion 62 is formed so that the lower end 62a of the extension portion 62 is closer to the inner surface 5a of the airtight member 5 than the outer end 61a of the base portion 61. In other words, the lower end 62a of the extension portion 62 extends to the outside of the room to a position beyond the reference line RL hanging down from the outer end 61a of the base portion 61. Note that, although the lower end 62a of the extension portion 62 is located slightly away from the inner surface 5a of the airtight member 5 in FIGS. 1 and 3, the lower end 62a may be in contact with the inner surface 5a.

[0037] Here, multiple airtight members 5 can be arranged inside the perimeter beam 2 so as to be lined up in the horizontal direction (the direction perpendicular to the paper surface of Figures 1 and 3). In this case, multiple airtight auxiliary devices 6 are attached to the corner portions C1 so as to be lined up in the horizontal direction at an appropriate pitch so as to be able to prevent all of the airtight members 5 from tipping over. Preferably, the airtight auxiliary devices 6 are attached so as to be located at the boundary between adjacent airtight members 5 (beam-crossing heat members 51). In this way, one airtight auxiliary device 6 can prevent two beam-crossing heat members 51 from tipping over.

[0038] [Airtight layer construction method] Next, a method for constructing the airtight layer 9 (FIG. 3) in the building 1 having the above-described structure will be described with reference to FIGS.

[0039] First, the basic structure of the building 1 is prepared as shown in Fig. 5. The basic structure includes a perimeter beam 2, an exterior wall 3 (Fig. 1), an underfloor material 4, and an airtight member 5. Of these, the underfloor material 4 and the airtight member 5 form a surface material structure SC having a corner portion C1.

[0040] Next, a liquid adhesive 100 is sprayed onto the corner C1 using a spray gun 101. The liquid adhesive 100 is, for example, an uncured paint that has fluidity and stickiness, and is sprayed in the form of a mist from the spray gun 101. By this spraying, the liquid adhesive 100 is continuously applied over the underside 4a of the floor underlayment 4 and the inner surface 5a of the airtight member 5.

[0041] The liquid adhesive 100 applied to the corner portion C1 as described above forms a first adhesive film 100a along the underside 4a of the floor underlayment 4 and a second adhesive film 100b along the inner surface 5a of the airtight member 5, as shown in Figure 6.

[0042] Next, while the liquid adhesive 100 is still in an uncured state, the airtightness aid 6 is attached to the corner portion C1 using the first adhesive film 100a. That is, the airtightness aid 6 is attached to the corner portion C1 by adhering the base portion 61 of the airtightness aid 6 to the underside 4a of the underfloor material 4 via the first adhesive film 100a. At this time, the adhesive position of the base portion 61 is adjusted so that the outer end 61a of the base portion 61 is slightly separated from the intersection X1 between the underside 4a of the underfloor material 4 and the inner surface 5a of the airtight member 5.

[0043] Thereafter, the liquid adhesive 100 hardens over time. That is, the first adhesive film 100a formed on the underside 4a of the underfloor material 4 and the second adhesive film 100b formed on the inner surface 5a of the airtight member 5 each harden. The hardened adhesive films 100a, 100b form an L-shaped airtight layer 9 (FIG. 3) that continuously covers the underside 4a of the underfloor material 4 and the inner surface 5a of the airtight member 5. That is, the hardened first adhesive film 100a forms a horizontal portion 91 of the airtight layer 9, and the hardened second adhesive film 100b forms a vertical portion 92 of the airtight layer 9. As a result, the intersection X1 is sealed by the airtight layer 9, and the gap between the underfloor material 4 and the airtight member 5 is airtightly sealed.

[0044] Furthermore, as the liquid adhesive 100 hardens, the base portion 61 of the airtightness aid 6 is fixed to the underfloor material 4. That is, the base portion 61 is fixed to the underfloor material 4 by the hardened first adhesive film 100a (i.e., the horizontal portion 91 of the airtight layer 9). This completes the attachment of the airtightness aid 6 to the corner portion C1. As shown in FIG. 3, the attached airtightness aid 6 is positioned so that the outer end 61a of its base portion 61 is spaced a distance L1 from the intersection X1.

[0045] [Action and effect] As explained above, in this embodiment, in order to form an airtight layer 9 in a corner portion C1 of a surface material structure SC including an underfloor material 4 and an airtight member 5, a liquid adhesive 100 is applied to the undersurface 4a of the underfloor material 4 and the inner surface 5a of the airtight member 5. In addition, an airtight auxiliary device 6 for preventing the airtight member 5 from collapsing is adhered to the underfloor material 4 via the liquid adhesive 100 (first adhesive film 100a) applied to the undersurface 4a of the underfloor material 4. This method has the advantage of allowing the airtight auxiliary device 6 to be efficiently attached to the corner portion C1 of the building 1 where the airtight layer 9 is to be formed.

[0046] That is, in this embodiment, the liquid adhesive 100 is applied to the corner portion C1 of the surface material structure SC so as to cover both the underside 4a and the inner side 5a, which are the forming surfaces of the corner portion C1, and as the liquid adhesive 100 hardens, an airtight layer 9 that airtightly seals between the underfloor material 4 and the airtight member 5 can be formed. Moreover, the liquid adhesive 100 applied to form this airtight layer 9 is used to adhere the airtight auxiliary device 6 to the underside 4a of the underfloor material 4, so that the adhesive application of the liquid adhesive 100 can be followed quickly by the adhesion of the airtight auxiliary device 6, and there is no need to prepare dedicated fasteners (such as screws or bolts) for fixing the airtight auxiliary device 6. This allows the airtight auxiliary device 6 to be efficiently attached to the corner portion C where the airtight layer 9 is to be formed.

[0047] In addition, in this embodiment, the airtightness aid 6 is adhered while being spaced apart from the intersection X1 between the underside 4a of the floor underlayment 4 and the inner surface 5a of the airtight member 5, so that the airtightness aid 6 can be attached to the corner portion C1 while ensuring good airtightness.

[0048] That is, to ensure airtightness between the underfloor material 4 and the airtight member 5, it is important to apply a required amount of liquid adhesive 100 to the intersection X1 between the undersurface 4a of the underfloor material 4 and the inner surface 5a of the airtight member 5, thereby reliably covering the intersection X1 with the airtight layer 9. In this embodiment, the airtight auxiliary device 6 is adhered while being spaced apart from the intersection X1, which is important for ensuring airtightness, so that the amount of liquid adhesive 100 applied to the intersection X1 can be maintained, and the airtight auxiliary device 6 can be attached to the corner portion C1 while ensuring good airtightness.

[0049] Furthermore, in this embodiment, the liquid adhesive 100 is applied (sprayed) using a spray gun 101 to the high corner portion C1 formed by the floor underlayment material 4 and the airtight member 5, so that the application of the liquid adhesive 100 can be easily performed even though the work is done at a high altitude, and the airtight layer 9 can be easily constructed.

[0050] Furthermore, in this embodiment, the airtightness auxiliary device 6 is attached to the corner portion C1 so as to prevent the airtight member 5 from falling over, so that the airtight member 5 can be positioned at a desired position while simplifying the attachment of the airtight member 5.

[0051] That is, in this embodiment, the airtight member 5 is attached by a simple method of being fitted adjacent to the underfloor material 4. Even in such a case, according to this embodiment in which the airtight auxiliary device 6 is attached to the corner portion C1 as a fall prevention device that restricts the fall (movement) of the airtight member 5, it is possible to position the airtight member 5 at a desired position along the inner surface of the perimeter beam 2, and the attachment position of the airtight member 5 can be stabilized.

[0052] Moreover, in this embodiment, the airtightness aid 6 has a base portion 61 that is adhered to the underfloor surface 4a of the underfloor material 4 while being spaced apart from the intersection X1 between the underfloor surface 4a and the inner surface 5a, and an extension portion 62 that extends obliquely downward from an inner end 61b of the base portion 61 that is opposite the airtight member 5 toward the airtight member 5. This makes it possible to space the base portion 61 of the airtightness aid 6 away from the intersection X1, while the extension portion 62 extending obliquely downward from the base portion 61 appropriately prevents the airtight member 5 from falling over.

[0053] In particular, in this embodiment, the lower end 62a of the extension portion 62 extends to a position closer to the inner surface 5a of the airtight member 5 than the outer end 61a, which is the end of the base portion 61 closer to the airtight member 5, so that the lower end 62a of this extension portion 62 can effectively prevent the airtight member 5 from falling over, and the mounting position of the airtight member 5 can be more stabilized.

[0054] [Variations] Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in the following manner, for example.

[0055] In the above embodiment, the airtightness aid 6 used to prevent the airtight member 5 from tipping over includes a base portion 61 adhered to the underside 4a of the underfloor material 4 and an extension portion 62 extending diagonally downward from the inner end 61b of the base portion 61 toward the airtight member 5. However, the shape of the airtightness aid 6 is not limited to this. For example, an L-shaped airtightness aid 600 as shown in FIG. 7 may be used. That is, the airtightness aid 600 includes a base portion 601 adhered to the underside 4a of the underfloor material 4 and a hanging portion 602 extending downward from an outer end 601a, which is the end of the base portion 601 closer to the airtight member 5. In this case, the outer end 601a of the base portion 601 and the hanging portion 602 are preferably located slightly away from the inner surface 5a of the airtight member 5 (or the intersection X1).

[0056] In the above embodiment, the liquid adhesive 100 is applied to the corner C1 between the underfloor material 4 and the airtight member 5 using the spray gun 101, but the method of applying the liquid adhesive 100 is not limited to this. For example, the liquid adhesive 100 may be applied to the corner C1 using a brush or the like.

[0057] In the above embodiment, the airtight layer 9 is formed at the corner C1 between the underfloor material 4 and the airtight member 5, but the object on which the airtight layer 9 is formed is not limited to this. For example, the liquid adhesive may be applied to the corner where two wall materials having vertical inner surfaces intersect.

[0058] In the above embodiment, the airtight auxiliary tool 6 for preventing the airtight member 5 from falling over is adhered to the corner C1 via the liquid adhesive 100 (airtight layer 9), but the object (attachment object) that can be attached to the corner C1 by adhesion using the liquid adhesive 100 is not limited to this. For example, an additional insulating material for improving thermal insulation may be attached to the corner C1 as the attachment object. Alternatively, a reinforcing member for improving earthquake resistance may be attached to the corner C1.

[0059] In the above embodiment, the airtightness auxiliary device 6 as the attachment object is adhered only to the underside 4a of the underfloor material 4, which is one constituent surface of the corner portion C1, but the attachment object can also be adhered to the inner surface 5a of the airtight member 5, which is the other constituent surface of the corner portion C1. In other words, the attachment object only needs to be adhered to at least one of the two surfaces (first inner surface and second inner surface) that intersect with each other to form the corner portion, and which of the two surfaces (either one or both of the first inner surface and second inner surface) the attachment object is adhered to can be selected appropriately depending on the shape, structure, etc. of the attachment object. [Explanation of symbols]

[0060] 1. Building 4. Underfloor material (first surface material) 4a Bottom surface (first inner surface) 5 Airtight material (second surface material) 5a Inner surface (second inner surface) 6. Airtight auxiliary equipment (object to be attached) 9 Airtight Layer 100 Liquid Adhesive C1 corner SC surface material structure X1 intersection

Claims

1. A method for constructing an airtight layer in a building, A panel structure is prepared, the panel structure including a first panel having a first inner surface facing the interior side of the room, and a second panel arranged to abut against the first inner surface of the first panel and having a second inner surface facing the interior side of the room; applying a liquid adhesive for forming an airtight layer over the first inner surface and the second inner surface at least at a corner portion where the first inner surface and the second inner surface intersect; an object to be attached to the surface material structure is adhered to at least one of the first inner surface and the second inner surface via the liquid adhesive; The method for constructing an airtight layer includes bonding the object to be attached in a state where the object to be attached is spaced apart from the intersection of the first inner surface and the second inner surface.

2. The method for constructing an airtight layer according to claim 1, wherein in preparing the surface material structure, the surface material structure is prepared having the first surface material arranged so that the first inner surface faces downward to form a ceiling.

3. 3. The method for constructing an airtight layer according to claim 1 or 2, wherein the attachment object is attached to the first inner surface to restrict movement of the second surface material toward the indoor side.

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