Interior wall installation structure

Abstract

To provide an interior wall installation structure capable of improving assembly accuracy and manufacturing efficiency for the entire interior wall.SOLUTION: In an interior wall installation structure in which an interior wall panel 30 is installed adjacent to an indoor side of an exterior wall of a building unit 10 with an exterior wall mounted, a transverse projection portion 136 protruding in a width direction toward an adjacent interior wall panel 30 is mounted on a side edge of the interior wall panel 30 integrated with a frame 32 by mounting a gypsum board, and the transverse projection portion 136 extends continuously in a height direction of the interior wall panel 30.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to an interior wall installation structure. [Background technology]

[0002] 2. Description of the Related Art Conventionally, it has been known to construct an interior wall by attaching an interior wall surface material such as a plaster board to a building unit (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a configuration in which an interior wall surface material such as a plaster board is attached to the interior side of an interior wall frame installed in a building unit by means of fastening fixtures such as screws. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-89196 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when installing an interior wall in a building unit, the interior wall is generally formed by attaching gypsum board to a wooden batten (or frame) that is attached to the side of the building unit as a base, using fastening fixtures such as screws. However, in this case, after the wooden batten is attached to the building unit, the gypsum board is attached to the wooden batten using a large number of screws, which is a manual task by a worker, and this creates a problem in that a lot of man-hours are required. In addition, since the wooden batten and gypsum board are attached to the building unit after the exterior wall is installed on the building unit, there is a restriction that the exterior wall prevents work from being done from the outside. Furthermore, nailing, which can be done in a relatively short time, has not been adopted much because there is a risk that it will not be possible to adjust the level difference by the amount of screwing in the interior wall.

[0006] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide an inner wall installation structure that can improve the assembly accuracy and manufacturing efficiency of the inner wall as a whole. [Means for solving the problem]

[0007] In order to achieve the above-mentioned objective, the interior wall installation structure of the present invention is an interior wall installation structure in which an interior wall panel is installed adjacent to the indoor side of an exterior wall attached to a building unit to which an exterior wall is attached, and is characterized in that a lateral protrusion portion that protrudes in the width direction toward the adjacent interior wall panel is attached to the side edge of the interior wall panel, which is integrated by attaching gypsum board to a frame, and the lateral protrusion portion extends continuously in the height direction of the interior wall panel. Effect of the Invention

[0008] In the interior wall installation structure of the present invention, since a lateral protrusion portion that is continuous in the height direction is provided, the step between the side edges of adjacent interior wall panels can be adjusted at any position in the height direction between the lateral protrusion portion and the interior wall panel. In this way, by providing a new step adjustment means between the interior wall panel and the lateral protrusion, the interior wall panel does not require step adjustment between the gypsum board and the frame. Therefore, there is no problem even if the interior wall panel is changed to one that does not allow step adjustment, in which the gypsum board is nailed to the frame instead of being screwed. Therefore, the assembly accuracy and manufacturing efficiency of the interior wall as a whole can be improved. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view showing the configuration of a unit building. [Diagram 2] FIG. 2 is a perspective view showing the configuration of a building unit used in the unit building of FIG. 1. [Figure 2A] FIG. 13 is a partially enlarged perspective view showing the installation of studs and corner studs to the side of the building unit. [Figure 2B] FIG. 2 is a plan view showing how the exterior wall panel is attached to the studs. [Figure 2C] 1 is a perspective view showing how multiple exterior wall panels are attached to studs to increase the size of the panel. FIG. [Figure 2D] FIG. 13 is a perspective view showing how an enlarged exterior wall panel is attached to a side surface of a building unit. [Diagram 3] FIG. 2 is an exploded perspective view of a side of the building unit for illustrating the interior wall installation method of the first embodiment. [Figure 4] FIG. 2 is a cross-sectional view for explaining an inner wall installation method in the first embodiment. [Diagram 5] 4 is a cross-sectional view for explaining an inner wall connecting step of the inner wall installation method of the first embodiment. FIG. [Figure 6] FIG. 11 is a cross-sectional view showing a first modified example of the inner wall installation method of the first embodiment. [Figure 7] FIG. 11 is a cross-sectional view showing a second modified example of the inner wall installation method of the first embodiment. [Figure 8] FIG. 11 is a cross-sectional view for explaining an inner wall installation method in the second embodiment. [Figure 9] FIG. 11 is a cross-sectional view for explaining an inner wall installation method in the third embodiment. [Figure 10] FIG. 11 is a cross-sectional view showing a modified example of the inner wall installation method of the third embodiment. [Figure 11] FIG. 11 is an exploded perspective view of the side of a building unit for illustrating the interior wall installation structure and method of the fourth embodiment. [Figure 12] FIG. 12 is a side longitudinal section of the building unit of FIG. 11 with the interior wall panels installed. [Figure 13] FIG. 13 is an enlarged view of the lower part of FIG. [Figure 14] FIG. 12 is a horizontal cross-sectional view of a fixing portion (building fixing part) for the building unit of FIG. 11. [Figure 15] FIG. 11 is a process diagram of an inner wall installation method according to a fourth embodiment. [Figure 16] FIG. 2 is a schematic plan view showing an interior wall panel manufactured by nailing. [Figure 17] 11 is a cross-sectional view showing another embodiment of the inner wall connecting step of the inner wall installation method. FIG. [Figure 18] 11 is a cross-sectional view showing another embodiment of the inner wall connecting step of the inner wall installation method. FIG. [Figure 19] 11 is a cross-sectional view showing another embodiment of the inner wall connecting step of the inner wall installation method. FIG. [Figure 20] 7 is a cross-sectional view similar to FIG. 5, showing still another embodiment of an inner wall connecting step of the inner wall installation method. [Figure 21] 13 is a cross-sectional view showing a state in which an interior wall panel adjacent to a lateral protrusion is attached using a fastening fixture having a straight portion between the threaded portions on the tip and base ends. FIG. [Figure 22] This is a cross-sectional view showing the state in which the side edge of the adjacent interior wall panel is attached to the horizontal protrusion with a general screw. (a) shows the initial state of attachment, and (b) shows the state after attachment. [Figure 23] 13 is a cross-sectional view showing the effect of a fastening fixture having a straight portion between the threaded portions on the distal end and proximal end. FIG. [Figure 24] FIG. 1A is a side view of a fastening fixture having a threaded portion on the tip end side and a straight portion on the base end side, and FIG. 1B is a cross-sectional view showing the fastening fixture of FIG. [Diagram 25] FIG. 13 is a cross-sectional view showing a state in which a fastening fixture having a straight portion is driven too deeply between the threaded portions on the distal end side and the proximal end side. [Figure 26] 7 is a cross-sectional view similar to FIG. 6, showing an example of application of a fastening fixture having a straight portion between the threaded portions on the distal and proximal ends to another portion. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the inner wall installation method and the inner wall installation structure of the present invention, specific examples 1 to 4, and modifications will be described with reference to the drawings.

[0011] The interior wall installation method according to the present embodiment is applied to a unit building that is constructed by transporting building units manufactured in advance in a factory to a construction site and assembling a plurality of building units at the construction site. Note that the above is similar in each of the embodiments.

[0012] [Unit building configuration] 1 is an overall perspective view showing the configuration of a unit building 1. The configuration of this unit building 1 will be described below.

[0013] For example, the unit building 1 in the figure has a two-story structure in which a plurality of building units 10 constituting the first floor and a plurality of building units 10 constituting the second floor are stacked side by side on a foundation 2, and a roof panel 5 is installed on the building units 10 of the second floor. However, the shape and structure of the unit building 1 are not limited to those described above.

[0014] [Building unit 10 configuration] 2 is an overall perspective view showing the basic structure of a building unit 10 used in the unit building 1. The structure of this building unit 10 will be described below.

[0015] The building unit 10 in the figure is rectangular parallelepiped, and has a box-shaped framework (unit frame) as its framework. This framework has four columns 11 arranged at the corners of the building unit 10, four floor girders 12 that are spanned between and connected to the lower ends of the four columns 11, and four ceiling girders 13 that are spanned between and connected to the upper ends of the four columns 11.

[0016] The four floor girders 12 and ceiling girders 13 are beams that respectively form a rectangular floor frame and ceiling frame. The floor frame and ceiling frame respectively form the lower surface and upper surface of the building unit 10. In addition, the four side surfaces of the building unit 10 are formed by two adjacent columns 11 and the floor girders 12 and ceiling girders 13 that are respectively spanned between the upper ends and lower ends of the two columns 11.

[0017] In addition to the above-mentioned box-frame frame structure framework, the main components of the building unit 10 include floor joists 14, ceiling joists 15, floor surface material 16, and ceiling surface material 17. The floor joists 14 and ceiling joists 15 are beams that are installed horizontally inside the floor and ceiling frames, respectively. The floor surface material 16 and ceiling surface material 17 are installed horizontally inside the floor and ceiling frames, respectively, so as to cover the floor and ceiling frames.

[0018] The columns 11 are formed, for example, from rectangular steel pipes extending vertically. The floor girders 12 and the ceiling girders 13 are formed, for example, from horizontal channel steel members that have a C-shaped cross section with a web portion, an upper flange portion, and a lower flange portion and are installed facing inward.

[0019] The floor joists 14 are formed to have approximately the same length as the pair of short floor girders 12 that make up the short sides of the floor frame. The floor joists 14 are connected in parallel at required intervals between the pair of long floor girders 12 that make up the long sides of the floor frame along the floor girders 12. The floor joists 14 are formed, for example, from horizontal rectangular steel pipes.

[0020] The ceiling joists 15 are formed to have approximately the same length as the pair of short ceiling girders 13 that make up the short sides of the ceiling frame. The ceiling joists 15 are connected by bridging the pair of long ceiling girders 13 that make up the long sides of the ceiling frame in parallel with each other at required intervals along the ceiling girders 13. The ceiling joists 15 are formed, for example, from square steel pipes that are horizontal and rectangular.

[0021] The floor surface material 16 is installed on the floor joists 14. The floor joists 14 support the floor surface material 16 from below. The ceiling surface material 17 is attached below the ceiling joists 15. The ceiling joists 15 support the ceiling surface material 17 from above.

[0022] [About the exterior walls] Then, exterior walls are attached to the periphery of the unit building 1. The exterior walls are provided on the side surfaces of the building units 10 that form the periphery of the unit building 1. On the side surfaces of the building units 10 to which the exterior walls are attached, as shown in Fig. 2A, one or more studs 18 are installed between the ceiling girder 13 and floor girder 12 that are suspended between two adjacent columns 11. Regarding the position of the columns 11, corner studs 19, which have almost the same function as the studs 18, are installed along the columns 11.

[0023] Studs 18 extend in the vertical direction with a length approximately equal to the distance between ceiling girders 13 and floor girders 12. Studs 18 are installed parallel to each other at required intervals along the longitudinal direction of ceiling girders 13 and floor girders 12. Studs 18 are formed, for example, by channel steel having a C-shaped cross section and installed facing inward. Corner studs 19 are formed, for example, by members with an L-shaped cross section that extend in the vertical direction with approximately the same length as studs 18.

[0024] The exterior wall is constructed by attaching a plurality of exterior wall panels 20 to studs 18 and corner studs 19 that are attached in advance to the side of the building unit 10, as shown in Fig. 2B. Both sides of the exterior wall panels 20 are attached to the studs 18 and corner studs 19. Alternatively, the exterior wall may be enlarged by connecting a plurality of exterior wall panels 20 via studs 18, as shown in Fig. 2C, and then attached to the side of the building unit 10 together with the studs 18 in the enlarged state, as shown in Fig. 2D. By connecting a plurality of exterior wall panels 20 to enlarge the size in advance, the exterior wall can be installed on the side of the building unit 10 all at once.

[0025] The exterior wall panels 20 are formed to have a width dimension approximately equal to the distance between adjacent studs 18, and are attached so as to straddle between adjacent studs 18. The exterior wall panels 20 located on both sides of the side surfaces of the building unit 10 are formed to have a width dimension approximately equal to the distance between a stud 18 and a corner stud 19, and are attached so as to straddle between the stud 18 and the corner stud 19.

[0026] The exterior wall panel 20 is installed on the side of the building unit 10 from the outside (or outdoor side). The exterior wall panel 20 is fixed to the studs 18 from the inside (or indoor side) with a fastener such as a rivet 120 (FIG. 2B).

[0027] The rivet 120 can be, for example, a shank with a ball-shaped or other bulging head at the tip that is fitted into a cylindrical body, and the tip of the cylindrical body is torn apart by pulling the shank, and the tip of the expanded cylindrical body is engaged. A flange is integrally provided at the middle or rear end of the cylindrical body. The cylindrical body and the shaft are disposed between the partition 18 and the exterior wall panel 20 (mounting frame 20a provided at the side edge or the like) and are disposed substantially perpendicularly from the interior side to the exterior side. At this time, the flange is engaged with the interior side surface of the partition 18. The tip of the expanded cylindrical body is engaged with the exterior wall panel 20 (inside the mounting frame 20a). The exterior wall panel 20 is fixed by sandwiching the partition 18 and the exterior wall panel 20 (mounting frame 20a) between the flange and the tip of the expanded cylindrical body. By fixing the exterior wall panel 20 from the inside of the room with the rivets 120, the exterior wall panel 20 does not have any mounting holes opening to the outer surface, so that the exterior wall panel 20 is less likely to leak rain.

[0028] Then, as shown in FIG. 3, an interior wall is installed from the indoor side of the building unit 10 against the side of the building unit 10 (to which the exterior wall panel 20 is attached) to which the exterior wall panel 20 and studs 18 have already been attached.

[0029] The reason why the exterior wall is installed first on the side of the building unit 10 is that the weight of the exterior wall is heavy (heavier than the weight of the interior wall), and the installation of the exterior wall causes a relatively large misalignment of the building unit 10 (deformation or displacement of the unit frame), which changes the construction accuracy of the interior wall, and therefore adjustment of the misalignment is necessary. Therefore, the interior wall is installed after the adjustment of the building unit 10 in which the exterior wall is installed first. This reduces the misalignment of the building unit 10 due to the installation of the interior wall, making it possible to eliminate or facilitate the adjustment of the misalignment after the installation of the interior wall. In contrast, if the interior wall is installed first and the exterior wall is installed later, it is necessary to adjust the misalignment of the building unit 10 twice, once after the installation of the interior wall and once after the installation of the exterior wall. Therefore, installing the exterior wall first and then the interior wall is advantageous in terms of construction because it requires less adjustment work.

[0030] In short, this embodiment is an interior wall installation method for installing an interior wall on the indoor side of an exterior wall in a building unit 10 to which an exterior wall is attached, an auxiliary part forming process for providing an auxiliary part (e.g., horizontal support members 21, 22, etc.) for assisting in the installation of the interior wall panel 30 from the indoor side to the building unit 10 or the interior wall panel 30 integrated by attaching the gypsum board 31 to the frame 32; an interior wall installation process for installing an interior wall panel 30 from the interior side of the building unit 10 provided with an installation auxiliary portion, or installing an interior wall panel 30 provided with the installation auxiliary portion from the interior side of the building unit 10; and a fastening step of fastening the interior wall panel 30 to the building unit 10 from the inside of the room via the mounting auxiliary portion.

[0031] The mounting aid may be provided on the building unit 10, on the interior wall panel 30, or on both the building unit 10 and the interior wall panel 30.

[0032] With the above configuration, even if the exterior wall has already been installed on the building unit 10 (i.e., it is not possible to work on the interior wall panel 30 from the outside of the room), the interior wall panel 30 can be attached to the building unit 10 all at once from the inside of the room via the attachment auxiliary part, and the interior wall can be formed by attaching multiple interior wall panels 30, thereby significantly reducing the amount of labor required.

[0033] Each of the above specific examples will be described below. EXAMPLES

[0034] The inner wall installation method of this embodiment will be described below.

[0035] [Inner wall installation method] Fig. 3 is an exploded perspective view for explaining the inner wall installation method of Example 1. Fig. 4 is a partially enlarged vertical cross-sectional view for explaining the horizontal support mounting step, inner wall installation step, and fastening step of the inner wall installation method of Example 1. Fig. 5 is a partially enlarged horizontal cross-sectional view for explaining the inner wall connecting step of the inner wall installation method of Example 1. The inner wall installation method of Example 1 will be explained below. Note that the upper and lower parts of the inner wall can have the same installation structure, so in Example 1, only the installation structure of the upper part will be explained. The installation structure of the lower part will be interpreted as necessary.

[0036] (Horizontal support installation process) As shown in Figures 3 and 4 (mainly Figure 4), in the horizontal support member installation process, the horizontal support member 22 is attached to the ceiling beam 15 by fastening fixtures S1 such as screws or bolts. In this case, the horizontal support member 22 serves as an auxiliary attachment part that is attached to the building unit 10. The horizontal support member installation process also serves as an auxiliary part formation process.

[0037] The undersides of both ends of the ceiling beam 15 are stepped. The stepped shapes are, from the end side, step upper portion 15a, step portion 15b, and step lower portion 15c.

[0038] The one-step higher upper step portion 15a is inserted into the inside of the ceiling girder 13 (between the upper flange portion and the lower flange portion) and is placed and held on the ceiling girder 13 (above the lower flange portion). The one-step lower lower step portion 15c has a ceiling surface material 17 attached over almost the entire area. The one-step lower step portion 15c is lower than the ceiling girder 13 (its lower flange portion). The step portion 15b is formed at the end position of the ceiling surface material 17. The step portion 15b is formed at a position on the indoor side that protrudes outside the ceiling girder 13 by a required amount. This step shape allows the difference in height between the underside of the ceiling girder 13 and the ceiling surface material 17 to be formed with just one member (ceiling joist 15).

[0039] The horizontal support member 22 is formed, for example, from a wooden piece having a rectangular cross section that is elongated vertically. The horizontal support member 22 is installed horizontally so as to extend between two adjacent columns 11 in the longitudinal direction (direction perpendicular to the paper surface). The horizontal support member 22 is installed over an area at least approximately equal to or slightly wider than the width dimension of the entire interior wall. In other words, the horizontal support member 22 is formed to extend between two adjacent columns 11 without interruption. However, the horizontal support member 22 may be a single piece, or may be installed in multiple pieces. The horizontal support member 22 may be, for example, a plurality of members each having a length approximately equal to the width dimension of the interior wall panel 30 described later, arranged side by side to extend.

[0040] The horizontal support member 22 is attached to the end of the ceiling joist 15 by the fastening fixture S1 so as to protrude downward from the underside of the ceiling surface material 17. In other words, the lower part of the horizontal support member 22 protrudes downward from the underside of the ceiling surface material 17 when attached to the ceiling joist 15 (not the ceiling surface material 17).

[0041] More specifically, the horizontal support 22 is installed on the underside of the ceiling joist 15 in a state where its upper surface and upper side surface are abutted and engaged at the corner portion between the step upper portion 15a (which extends from the ceiling joist 13 to the room side) and the step portion 15b. The end portion of the ceiling surface material 17 is almost abutted against the side surface of the horizontal support 22. The horizontal support 22 protrudes downward from the end position of the ceiling surface material 17 below the underside of the ceiling surface material 17. By attaching the horizontal support 22 using the corner portion between the step upper portion 15a and the step portion 15b on the underside of the ceiling joist 15, the horizontal support 22 can be easily installed in the correct position with high accuracy. The position of the horizontal support 22 can also be adjusted by installing a spacer between the above-mentioned corner portion and the horizontal support 22.

[0042] The fastening fixture S1 is attached to the horizontal support member 22 from below toward the top. The fastening fixture S1 penetrates the horizontal support member 22 and penetrates into the interior of the ceiling joist 15 by a required amount or more, thereby fixing the horizontal support member 22 to the ceiling joist 15. In other words, the horizontal support member 22 is fastened vertically by the fastening fixture S1. Depending on the situation, the horizontal support member 22 may be fastened horizontally or diagonally by the fastening fixture S1.

[0043] (Inner wall installation process) 3 and 4, in the interior wall installation process, the interior wall panel 30 is oriented vertically and moved in a substantially horizontal direction from the interior side to the exterior side, and the upper part of the interior wall panel 30 is installed by abutting (from the interior side) the horizontal support material 22. In this way, the horizontal support material 22 is hidden by the upper part of the interior wall panel 30 so that it cannot be seen from the interior side.

[0044] The interior wall panels 30 are formed by dividing the interior wall into panels of a specified size in the width direction. The interior wall is constructed by installing a plurality of interior wall panels 30 side by side. The interior wall panel 30 is integrally constructed of a wooden frame 32 (interior wall frame) and gypsum board 31 attached to the surface of the frame 32 facing the room. The interior wall panel 30 is formed at a height approximately equal to the distance between the upper surface of the floor surface material 16 and the lower surface of the ceiling surface material 17.

[0045] The frame 32 is formed in a rectangular frame shape from an upper horizontal frame 32a, a lower horizontal frame 32b, a left vertical frame 32c, and a right vertical frame 32d. A plurality of horizontal bars 32e are bridged between the left vertical frame 32c and the right vertical frame 32d. For example, in FIG. 3, three horizontal bars 32e are installed substantially horizontally with a gap between them in the vertical direction. However, the number of horizontal bars 32e is not limited to the above.

[0046] In this way, when the frame 32 and the gypsum board 31 are integrated to form the interior wall panel 30, the frame 32 and the gypsum board 31 become easy to handle, but on the other hand, when the exterior wall is installed first, the exterior wall gets in the way and prevents work from being done from the outside, so there is a restriction that all work to attach the interior wall panel 30 to the inside of the exterior wall can only be done from the inside. Moreover, when the interior wall panel 30 is made, the gypsum board 31 gets in the way and the frame 32 cannot be directly accessed from either the outside or inside of the room, so in order to attach the interior wall panel 30 from the inside of the room, some ingenuity is required, such as providing an auxiliary attachment part.

[0047] In this embodiment, the gypsum board 31 is attached to the frame 32 so as to form a protruding portion 31a that protrudes upward from the upper end of the frame 32 (upper horizontal frame 32a).

[0048] The protruding portion 31a protrudes downward by approximately the same amount as the horizontal support member 22 protrudes downward from the underside of the ceiling surface material 17. Since the height of the interior wall panel 30 is fixed, the frame 32 is formed so that the position of its upper end (upper horizontal frame 32a) is lower by the amount of the protruding portion 31a. It is also preferable that the horizontal support member 22 and the frame 32 are formed to be approximately the same thickness. The gypsum board 31 is attached to the frame 32 approximately perpendicularly by a plurality of fastening fixtures S2 such as screws or bolts.

[0049] The reason why fastening fixtures S2 such as screws or bolts are used to secure the gypsum board 31 to the frame 32 is that the mounting position of the gypsum board 31 in the perpendicular direction to the frame 32 can be adjusted by adjusting the amount of screwing in the screws or bolts (for example, by tightening or loosening them).

[0050] In the interior wall installation process, the interior wall panel 30, which is formed by attaching the gypsum board 31 to the frame 32 and integrating it with the frame 32, is turned upright and moved in an almost horizontal direction from the inside of the room to the outside of the room, and is installed with the protruding portion 31a abutting (from the inside of the room) against the horizontal support material 22. At this time, the outside surface of the protruding portion 31a abuts against the side surface of the horizontal support material 22 on the inside of the room, the upper end of the frame 32 faces the lower surface of the horizontal support material 22 in a nearly abutting state, and the upper end of the gypsum board 31 nearly butts against the end of the ceiling surface material 17 from below.

[0051] In addition, before the interior wall panel 30 is installed against the horizontal support 22, a heat insulating material 41 such as glass wool may be installed between the exterior wall panel 20, the interior wall panel 30, and the partition 18.

[0052] (Fascinating process) As shown in Fig. 4, in the fastening step, the interior wall panel 30 is attached to the horizontal support 22 by fastening fixtures S3 such as screws or bolts, with the protruding portion 31a abutting against the side surface of the horizontal support 22 from the inside of the room. The fastening fixtures S3 are attached to the interior wall panel 30 almost perpendicularly from the inside of the room toward the outside of the room. Then, the fastening fixtures S3 penetrate the interior wall panel 30 and penetrate into the horizontal support 22 by a required amount or more, thereby fixing the upper part of the interior wall panel 30 to the horizontal support 22. In other words, the interior wall panel 30 is fastened horizontally by the fastening fixtures S3. In this manner, the upper part (or lower part) of the interior wall panel 30 is attached to the building unit 10.

[0053] (Inner wall connection process) In the interior wall connecting process, the interior wall panels 30 are installed adjacent to the indoor side of the exterior wall of the building unit 10 to which the exterior wall has been attached, and then connected to each other from the indoor side, and as shown in Fig. 5, the connecting portion between adjacent interior wall panels 30 is provided with a horizontal extension portion 36 that extends widthwise from the left vertical frame 32c of one (right) interior wall panel 30 toward the right vertical frame 32d of the other (left) interior wall panel 30. The horizontal extension portion 36 also serves as an auxiliary attachment portion that is attached to the interior wall panel 30.

[0054] In this embodiment, the lateral extension 36 is a connecting part formed of a separate member from the left vertical frame 32c. The lateral extension 36 is installed on the exterior surface of the left vertical frame 32c so as to protrude laterally (to the left) beyond the left vertical frame 32c. The lateral extension 36 is mainly provided on the side edge of the interior wall panel 30 (the right interior wall panel 30 in this embodiment) that is installed first with respect to the side surface of the building unit 10, close to the adjacent interior wall panel 30. Depending on the order of installation of the interior wall panels 30, the lateral extension 36 can also be provided on the side of the right vertical frame 32d so as to protrude to the right.

[0055] The horizontal extension 36 can be, for example, a small piece of wood (split horizontal extension) having a substantially rectangular surface when the inner wall panel 30 is viewed substantially horizontally from the inside to the outside of the room. The horizontal extension 36 is formed to have a width dimension substantially equal to the combined width dimension of the left vertical frame 32c and the right vertical frame 32d. A plurality of horizontal extensions 36 (four in FIG. 3) are installed at intervals in the vertical direction on the surface of the left vertical frame 32c opposite to the side where the gypsum board 31 is attached (the outside of the room). Each horizontal extension 36 is attached to the left vertical frame 32c substantially perpendicularly from the outside to the inside of the room by fastening fixtures S4 such as screws or bolts. For example, in FIG. 3, the horizontal extension 36 is provided at a position between the upper horizontal frame 32a and the horizontal beam 32e, between the horizontal beams 32e, or between the horizontal beam 32e and the lower horizontal frame 32b. The auxiliary portion forming process for attaching the lateral extension portion 36 to the frame 32 is carried out during the interior wall panel manufacturing process for manufacturing the interior wall panel 30.

[0056] The lateral extension 36 is disposed across the outdoor surface between the left vertical frame 32c of one interior wall panel 30 and the right vertical frame 32d of the other interior wall panel 30 in the two adjacent interior wall panels 30 installed in the interior wall installation process (fixed to the building unit 10 in the fastening process). In other words, the lateral extension 36 is disposed so as to span the width direction between the two adjacent interior wall panels 30 installed in the interior wall installation process. In this embodiment, the lateral extension 36 is disposed away from the partition 18 and is not directly attached to the partition 18.

[0057] In the interior wall connecting process, one interior wall panel 30 is attached to the side surface of the building unit 10, and then the other interior wall panel 30 is installed next to the first interior wall panel 30. At this time, the side edge of the other interior wall panel 30 is abutted and engaged from the inside of the room with the lateral extension 36 previously attached to one of the interior wall panels 30. Then, the side edge of the other interior wall panel 30 is fixed to the lateral extension 36 of the one interior wall panel 30 by fastening fixtures S5 such as screws or bolts.

[0058] More specifically, the fastening fixture S5 is attached substantially perpendicular to the side edge of the other interior wall panel 30, from the inside to the outside of the room. The fastening fixture S5 penetrates the gypsum board 31 and the right vertical frame 32d installed on the side edge and enters the inside of the horizontal protrusion 36 by a required amount or more, whereby one interior wall panel 30 is attached to the other interior wall panel 30, and at the same time the other interior wall panel 30 is connected to the one interior wall panel 30 in the width direction.

[0059] Note that, instead of or in addition to the fastening fixture S5, two adjacent interior wall panels 30 may be connected with staples T, for example, from the inside of the room using a tool such as a stapler. The staples T may be driven in a horizontally parallel position, or in a diagonally inclined position, or may be driven in such a way that the staples cross each other in a diagonally inclined position. The staples T are made to have a length that reaches the lateral projection 36.

[0060] In this way, the side edges of the interior wall panels 30 are connected in the width direction. Then, a plurality of interior wall panels 30 are attached adjacent to the side surfaces of the building unit 10 to construct an interior wall. Note that adjacent interior wall panels 30 mean that the side edges of adjacent gypsum boards 31 are butted against each other with their positions aligned (without misalignment) in the direction perpendicular to the surfaces.

[0061] [Modification 1 of Example 1] 6 is a partially enlarged vertical cross-sectional view showing Modification 1 of the inner wall installation method of Example 1. Modification 1 of the inner wall installation method of Example 1 will be described below. Note that the inner wall connecting step has the same configuration as in Example 1, so the description will be omitted.

[0062] (Horizontal support installation process) 6, in the horizontal support member installation step, the horizontal support member 122 is attached to the ceiling beam 15 by fastening fixtures S1 such as screws or bolts. In this case, the horizontal support member 122 serves as an auxiliary attachment part for attachment to the building unit 10. The horizontal support member installation step also serves as an auxiliary part formation step.

[0063] The undersides of both ends of the ceiling beam 15 are stepped. The stepped shapes are, from the end side, step upper portion 15a, step portion 15b, and step lower portion 15c.

[0064] The one-step higher upper step portion 15a is inserted into the inside of the ceiling girder 13 (between the upper flange portion and the lower flange portion) and is placed and held on the ceiling girder 13 (above the lower flange portion). The one-step lower lower step portion 15c has a ceiling surface material 17 attached over almost the entire area. The one-step lower step portion 15c is lower than the ceiling girder 13 (its lower flange portion). The step portion 15b is formed at the end position of the ceiling surface material 17. The step portion 15b is formed at a position on the indoor side that protrudes outside the ceiling girder 13 by a required amount. This step shape allows the difference in height between the underside of the ceiling girder 13 and the ceiling surface material 17 to be formed with just one member (ceiling joist 15).

[0065] The horizontal support member 122 is made of wood, for example. The horizontal support member 122 is formed with an L-shaped cross section by two members, a first horizontal support member 122a and a second horizontal support member 122b. The first horizontal support member 122a and the second horizontal support member 122b are fastened together by fastening fixtures S6 such as screws or bolts.

[0066] The horizontal support member 122 is installed horizontally so as to extend between two adjacent pillars 11 in the longitudinal direction (direction perpendicular to the paper surface). The horizontal support member 122 is installed over an area that is approximately equal to or slightly wider than the width dimension of the entire interior wall. In other words, the horizontal support member 122 is formed to extend between two adjacent pillars 11 without interruption. However, the horizontal support member 122 may be a single piece, or may be installed in multiple pieces. The horizontal support member 122 may be, for example, a plurality of pieces that are approximately the same length as the width dimension of the interior wall panel 30 and extend side by side.

[0067] The horizontal support member 122 is composed of a first horizontal support member 122a and a second horizontal support member 122b. The horizontal support member 122 is attached to the ceiling joist 15 by fastening fixtures S1 so that the lower surface of the first horizontal support member 122a is at approximately the same height as the lower surface of the ceiling surface member 17, and so that the second horizontal support member 122b protrudes downward from the lower surface of the ceiling surface member 17. In other words, the horizontal support member 122 (the first horizontal support member 122a) is attached to the ceiling joist 15 (not the ceiling surface member 17), and (the second horizontal support member 122b) protrudes downward from the lower surface of the ceiling surface member 17.

[0068] More specifically, the horizontal support member 122 is installed with the first horizontal support member 122a abutting and engaging with the corner portion between the step upper portion 15a (which extends from the ceiling girders 13 toward the room side) and the step portion 15b on the underside of the ceiling beam 15. The underside of the first horizontal support member 122a is nearly flush with the underside of the ceiling surface material 17. The end of the ceiling surface material 17 nearly abuts against the lower portion of the side of the first horizontal support member 122a. The first horizontal support member 122a is preferably formed to the same thickness as the upper horizontal frame 32a.

[0069] The second horizontal support member 122b is installed on the underside of the ceiling joist 15 at the position of the step upper part 15a (which extends from the ceiling girders 13 to the room interior) with its upper surface abutting and engaging. The second horizontal support member 122b protrudes downward from the underside of the ceiling surface material 17 at a position away from the end of the ceiling surface material 17 to the room exterior by the thickness of the first horizontal support member 122a and the upper horizontal frame 32a. The horizontal support member 122 is easily installed in the correct position with high accuracy by attaching the horizontal support member 122 using the corner part between the step upper part 15a and the step part 15b on the underside of the ceiling joist 15. The position of the horizontal support member 122 can also be adjusted by installing a spacer between the above-mentioned corner part and the horizontal support member 122.

[0070] The fastening fixture S1 is attached to the horizontal support member 122 from the bottom upward. Then, the fastening fixture S1 penetrates the first horizontal support member 122a and penetrates into the ceiling joist 15 by a required amount or more, thereby fixing the first horizontal support member 122a to the ceiling joist 15. In other words, the horizontal support member 122 is fastened vertically by the fastening fixture S1. Depending on the situation, the horizontal support member 122 may be fastened horizontally or diagonally by the fastening fixture S1.

[0071] (Inner wall installation process) 6, in the interior wall installation process, the interior wall panel 30 is oriented vertically and moved in an approximately horizontal direction from the interior side to the exterior side of the room, and the upper part of the interior wall panel 30 is installed by abutting against the horizontal support material 122 (from the interior side). As a result, the horizontal support material 122 is hidden by the upper part of the interior wall panel 30 so that it cannot be seen from the interior side.

[0072] The interior wall panels 30 are formed by dividing the interior wall into panels of a specified size in the width direction. The interior wall is constructed by installing a plurality of interior wall panels 30 side by side. The interior wall panel 30 is integrally constructed of a wooden frame 32 (interior wall frame) and gypsum board 31 attached to the surface of the frame 32 facing the room. The interior wall panel 30 is formed at a height approximately equal to the distance between the upper surface of the floor surface material 16 and the lower surface of the ceiling surface material 17.

[0073] The frame 32 is formed in a rectangular frame shape by an upper horizontal frame 32a, a lower horizontal frame 32b, a left vertical frame 32c, and a right vertical frame 32d. A plurality of horizontal bars 32e are provided between the left vertical frame 32c and the right vertical frame 32d.

[0074] In this way, when the frame 32 and the gypsum board 31 are integrated to form the interior wall panel 30, the frame 32 and the gypsum board 31 become easy to handle, but on the other hand, when the exterior wall is installed first, the exterior wall gets in the way and prevents work from being done from the outside, so there is a restriction that all work to attach the interior wall panel 30 to the inside of the exterior wall can only be done from the inside. Moreover, when the interior wall panel 30 is made, the gypsum board 31 gets in the way and the frame 32 cannot be directly accessed from either the outside or inside of the room, so in order to attach the interior wall panel 30 from the inside of the room, some ingenuity is required, such as providing an auxiliary attachment part.

[0075] In this embodiment, the gypsum board 31 is attached to the frame 32 so as to be aligned to be approximately flush with the upper end (upper horizontal frame 32a) of the frame 32. The gypsum board 31 is attached to the frame 32 approximately perpendicularly by a plurality of fastening fixtures S2 such as screws or bolts.

[0076] The reason why fastening fixtures S2 such as screws or bolts are used to secure the gypsum board 31 to the frame 32 is that the mounting position of the gypsum board 31 in the perpendicular direction to the frame 32 can be adjusted by adjusting the amount of screwing in the screws or bolts (for example, by tightening or loosening them).

[0077] In the interior wall installation process, the interior wall panel 30, which is formed by attaching the gypsum board 31 to the frame 32 and integrating it with the frame 32, is turned upright and moved in a substantially horizontal direction from the inside to the outside of the room, and the exterior surface of the upper end of the frame 32 is installed by abutting the interior surface of the second horizontal support member 122b. At this time, the upper end of the frame 32 faces the lower surface of the first horizontal support member 122a of the horizontal support member 122 in a substantially abutting state, and the upper end of the gypsum board 31 is substantially butted against the end of the ceiling surface material 17 from below.

[0078] In addition, before the interior wall panel 30 is installed against the horizontal support 122, a heat insulating material 41 such as glass wool may be installed between the exterior wall panel 20, the interior wall panel 30, and the studs 18.

[0079] (Fascinating process) 6, in the fastening step, the interior wall panel 30 is attached to the horizontal support 122 by fastening fixtures S3 such as screws or bolts with the upper end of the frame 32 abutting against the side surface of the second horizontal support 122b from the inside of the room. The fastening fixtures S3 are attached to the interior wall panel 30 almost perpendicularly from the inside of the room toward the outside of the room. Then, the fastening fixtures S3 penetrate the gypsum board 31 and the frame 32 and enter (or penetrate) into the second horizontal support 122b by a required amount or more, thereby fixing the upper part of the interior wall panel 30 to the horizontal support 122. That is, the interior wall panel 30 is fastened horizontally by the fastening fixtures S3.

[0080] In this manner, the upper part (or lower part) of the interior wall panel 30 is attached to the building unit 10 .

[0081] [Modification 2 of Example 1] 7 is a partially enlarged vertical cross-sectional view showing a modified example 2 of the inner wall installation method of the embodiment 1. The modified example 2 of the inner wall installation method of the embodiment 1 will be described below. Note that the inner wall connecting step has the same configuration as that of the embodiment 1, and therefore the description will be omitted.

[0082] (Horizontal support installation process) 7, in the horizontal support member installation step, the horizontal support member 222 is installed on the ceiling beam 15 by fastening fixtures S1 such as screws or bolts. In this case, the horizontal support member 222 serves as an auxiliary attachment part for installation on the building unit 10. The horizontal support member installation step also serves as an auxiliary part formation step.

[0083] The undersides of both ends of the ceiling beam 15 are stepped. The stepped shapes are, from the end side, step upper portion 15a, step portion 15b, and step lower portion 15c.

[0084] The one-step higher upper step portion 15a is inserted into the inside of the ceiling girder 13 (between the upper flange portion and the lower flange portion) and is placed and held on the ceiling girder 13 (above the lower flange portion). The one-step lower lower step portion 15c has a ceiling surface material 17 attached over almost the entire area. The one-step lower step portion 15c is lower than the ceiling girder 13 (its lower flange portion). The step portion 15b is formed at the end position of the ceiling surface material 17. The step portion 15b is formed at a position on the indoor side that protrudes outside the ceiling girder 13 by a required amount. This step shape allows the difference in height between the underside of the ceiling girder 13 and the ceiling surface material 17 to be formed with just one member (ceiling joist 15).

[0085] The horizontal support member 222 is formed, for example, of an L-shaped metal fitting (or angle member) with an L-shaped cross section. The horizontal support member 222 is installed horizontally so as to extend between two adjacent columns 11 in the longitudinal direction (direction perpendicular to the paper surface). The horizontal support member 222 is installed over an area that is approximately equal to or slightly wider than the width dimension of the entire interior wall. In other words, the horizontal support member 222 is formed to pass through between two adjacent columns 11 without interruption. However, the horizontal support member 222 may be a single piece, or may be installed in multiple pieces. The horizontal support member 222 may be, for example, a plurality of members with a length approximately equal to the width dimension of the interior wall panel 30 arranged to extend.

[0086] The horizontal support member 222 is attached to the ceiling joist 15 by the fastening fixture S1 so as to protrude downward from the lower surface of the ceiling surface material 17. In other words, the horizontal support member 222 protrudes downward from the lower surface of the ceiling surface material 17 when attached to the ceiling joist 15 (not the ceiling surface material 17).

[0087] More specifically, horizontal support 222 (L-shaped metal fitting) with an L-shaped cross section has a horizontal surface 222a and a vertical surface 222b. Horizontal support 222 is installed on the underside of ceiling beam 15 along the corner between step upper portion 15a (which extends from ceiling beam 13 to the room side) and step portion 15b with horizontal surface 222a and vertical surface 222b respectively abutting and engaging with each other.

[0088] The end of the ceiling surface material 17 is almost abutted against the vertical surface portion 222b of the horizontal support member 222. The vertical surface portion 222b protrudes downward from the end position of the ceiling surface material 17 below the underside of the ceiling surface material 17. By attaching the horizontal support member 222 using the corner portion between the step upper portion 15a and the step portion 15b on the underside of the ceiling joist 15, the horizontal support member 222 can be easily installed in the correct position with high accuracy. The position of the horizontal support member 222 can also be adjusted by installing a spacer between the above-mentioned corner portion and the horizontal support member 222.

[0089] The fastening fixture S1 is attached from below to above the horizontal support member 222. The fastening fixture S1 penetrates the lateral surface portion 222a of the horizontal support member 222 and penetrates into the interior of the ceiling joist 15 by a required amount or more, thereby fixing the horizontal support member 222 to the ceiling joist 15. In other words, the horizontal support member 222 is fastened in the vertical direction by the fastening fixture S1. Note that the horizontal support member 222 may be fastened in the horizontal direction or in an oblique direction by the fastening fixture S1 depending on the situation.

[0090] (Inner wall installation process) 7, in the interior wall installation process, the interior wall panel 30 is oriented vertically and moved in an approximately horizontal direction from the interior side to the exterior side of the room, and the upper part of the interior wall panel 30 is installed by abutting against the horizontal support material 222 (from the interior side). As a result, the horizontal support material 222 is hidden by the upper part of the interior wall panel 30 so that it cannot be seen from the interior side.

[0091] The interior wall panels 30 are formed by dividing the interior wall into panels of a specified size in the width direction. The interior wall is constructed by installing a plurality of interior wall panels 30 side by side. The interior wall panel 30 is integrally constructed of a wooden frame 32 (interior wall frame) and gypsum board 31 attached to the surface of the frame 32 facing the room. The interior wall panel 30 is formed at a height approximately equal to the distance between the upper surface of the floor surface material 16 and the lower surface of the ceiling surface material 17.

[0092] The frame 32 is formed in a rectangular frame shape by an upper horizontal frame 32a, a lower horizontal frame 32b, a left vertical frame 32c, and a right vertical frame 32d. A plurality of horizontal bars 32e are provided between the left vertical frame 32c and the right vertical frame 32d.

[0093] In this way, when the frame 32 and the gypsum board 31 are integrated to form the interior wall panel 30, the frame 32 and the gypsum board 31 become easy to handle, but on the other hand, when the exterior wall is installed first, the exterior wall gets in the way and prevents work from being done from the outside, so there is a restriction that all work to attach the interior wall panel 30 to the inside of the exterior wall can only be done from the inside. Moreover, when the interior wall panel 30 is made, the gypsum board 31 gets in the way and the frame 32 cannot be directly accessed from either the outside or inside of the room, so in order to attach the interior wall panel 30 from the inside of the room, some ingenuity is required, such as providing an auxiliary attachment part.

[0094] In this embodiment, the gypsum board 31 is attached to the frame 32 so as to form a protruding portion 31a that protrudes upward from the upper end (upper horizontal frame 32a) of the frame 32. The protruding portion 31a protrudes by approximately the same amount as the protruding amount downward from the lower surface of the ceiling surface material 17 at the vertical surface portion 222b of the horizontal support member 222. At this time, since the height of the interior wall panel 30 is fixed, the frame 32 is formed so that the position of the upper end (upper horizontal frame 32a) is lower by the amount of the protruding portion 31a. The gypsum board 31 is attached to the frame 32 approximately perpendicularly by a plurality of fastening fixtures S2 such as screws or bolts.

[0095] The reason why fastening fixtures S2 such as screws or bolts are used to secure the gypsum board 31 to the frame 32 is that the mounting position of the gypsum board 31 in the perpendicular direction to the frame 32 can be adjusted by adjusting the amount of screwing in the screws or bolts (for example, by tightening or loosening them).

[0096] In the interior wall installation process, the interior wall panel 30, which is formed by attaching the gypsum board 31 to the frame 32 and integrating it with the frame 32, is turned upright and moved in an almost horizontal direction from the inside of the room to the outside of the room, and the protrusion 31a is abutted against the horizontal support material 222 (from the inside of the room) and installed. At this time, the outside surface of the protrusion 31a abuts against the inside surface of the vertical surface 222b of the horizontal support material 222. Most of the upper end of the frame 32 is located outside the room relative to the vertical surface 222b of the horizontal support material 222. The upper end of the gypsum board 31 is almost abutted against the end of the ceiling surface material 17 from below.

[0097] In addition, before the interior wall panel 30 is installed against the horizontal support 222, a heat insulating material 41 such as glass wool may be installed between the exterior wall panel 20, the interior wall panel 30, and the studs 18.

[0098] (Fascinating process) As shown in Fig. 7, in the fastening step, the interior wall panel 30 is attached to the horizontal support 222 by fastening fixtures S3 such as screws or bolts with the protruding portion 31a abutted against the vertical surface 222b of the horizontal support 222 from the inside of the room. The fastening fixtures S3 are attached to the interior wall panel 30 almost perpendicularly from the inside of the room toward the outside of the room. The fastening fixtures S3 then penetrate the gypsum board 31 and further penetrate the vertical surface 222b of the horizontal support 222, thereby fixing the upper part of the interior wall panel 30 to the horizontal support 222. That is, the interior wall panel 30 is fastened horizontally by the fastening fixtures S3.

[0099] In this manner, the upper part (or lower part) of the interior wall panel 30 is attached to the building unit 10 .

[0100] [Inner wall installation structure] The inner wall installation structure created by the inner wall installation method of the first embodiment is, for example, as shown below (for example, when the top and bottom have the same structure). Horizontal supports 22, 122, 222 extending between the pillars 11 are attached to the beams (ceiling joists 15) so as to protrude downward beyond the ceiling surface material 17. Horizontal supports 22, 122, 222 extending between the pillars 11 and protruding above the floor surface material 16 are attached to the beams (floor joists 14). In addition, a plurality of lateral extensions 36 that extend widthwise toward the adjacent interior wall panel 30 (the surface facing the exterior side) are attached to the side edge of the interior wall panel 30 at intervals in the height direction.

[0101] The upper and lower ends of the interior wall panels 30 are fixed to the horizontal supports 22, 122, 222 from the inside of the room by fastening fixtures S3, respectively, almost perpendicular to their faces. Also, the side edge of one interior wall panel 30 is fixed to the lateral extension 36 of the side edge of the other interior wall panel 30 from the inside of the room by fastening fixtures S5, so that the side edges of adjacent interior wall panels 30 are connected at several points in the width direction via the multiple lateral extensions 36.

[0102] [Action and effect of interior wall installation method] The operation and effect of the interior wall installation method of the embodiment 1 will be described below. In the interior wall installation method of the embodiment 1, an interior wall is installed on the indoor side of an exterior wall attached to a building unit 10 having beams (ceiling joists 15, floor joists 14) and columns 11. This interior wall installation method includes a horizontal support member installation step of attaching horizontal supports 22, 122, 222 that extend between columns 11 and protrude below the ceiling surface material 17 or above the floor surface material 16 to the beams (ceiling joists 15, floor joists 14), an interior wall installation step of abutting an interior wall panel 30 with a gypsum board 31 attached to a frame 32 against the horizontal supports 22, 122, 222 (from the interior side of the room) and installing the interior wall panel 30, and a fastening step of fastening the interior wall panel 30 and the horizontal supports 22, 122, 222 (from the interior side to the exterior side of the room) (FIG. 3).

[0103] In this case, the mounting auxiliary part is a horizontal support 22, 122, 222 that protrudes below the ceiling surface material 17 installed on the beams (ceiling joists 15, floor joists 14) provided on the upper or lower surface of the building unit 10, or above the floor surface material 16, and extends between adjacent columns 11 provided on the building unit 10, and the auxiliary part formation process is a horizontal support installation process in which the horizontal support 22, 122, 222 is attached to the beams (ceiling joists 15, floor joists 14), and in the interior wall installation process, the interior wall panel 30 is installed by abutting it against the horizontal support 22, 122, 222 from the inside of the room, and in the fastening process, the interior wall panel 30 and the horizontal support 22, 122, 222 are fastened from the inside of the room.

[0104] This allows the interior wall to be formed by attaching the interior wall panel 30, which is previously integrated by attaching the gypsum board 31 to the frame 32, to the horizontal supports 22, 122, 222 installed on the beams (ceiling beam 15, floor beam 14) at once. Therefore, for example, after attaching the wooden battens (or frames) that serve as the base to the sides of the building unit 10 in a factory, a worker does not need to attach the gypsum board 31 to the wooden battens with a large number of fastening fixtures S3 such as screws or bolts, or, for example, attach the frame 32 and the gypsum board 31 separately to the building unit 10 in a factory. This makes it possible to significantly reduce the labor required to attach the gypsum board 31 to the building unit 10.

[0105] In addition, since the gypsum boards 31 are attached to the frame 32 in advance to form the interior wall panel 30, the manufacture of the interior wall panel 30 can be automated, for example, by using a machine. In addition, the work of attaching the gypsum boards 31 to the frame 32 and attaching the integrated interior wall panel 30 to the building unit 10 can also be automated. This improves work efficiency. Furthermore, the automation makes it possible to accurately attach the gypsum boards 31 to the desired positions on the frame 32. As a result, work efficiency can be improved and quality can be stabilized.

[0106] In addition, the interior wall panel 30 is installed in contact with the horizontal supports 22, 122, 222 attached to the beams (ceiling beam 15, floor beam 14). Therefore, the interior wall panel 30 can be positioned by the horizontal supports 22, 122, 222. As a result, the interior wall panel 30 can be installed at a desired position. In this case, if the horizontal supports 22, 122, 222 are accurately positioned and attached to the building unit 10, the interior wall panel 30 can be accurately positioned simply by attaching it to the horizontal supports 22, 122, 222. Therefore, it is not necessary to position the interior wall panel 30 relative to the building unit 10. Also, it is not necessary to position and attach the members (frame 32 and gypsum board 31) to the building unit 10 one by one, and the number of positioning operations can be reduced overall.

[0107] Furthermore, by previously attaching and integrating the gypsum board 31 to the frame 32, the gypsum board 31 can be protected by the frame 32. Therefore, damage to the gypsum board 31 during transportation can be prevented.

[0108] Then, the interior wall panel 30 is attached to the horizontal supports 22, 122, 222 from the indoor side. Therefore, even if an exterior wall is attached to the building unit 10, the interior wall panel 30 can be attached without being hindered by the exterior wall.

[0109] Incidentally, in the existing unit building 1, the interior wall (interior wall panel 30) was integrated with the exterior wall at multiple points via wooden bricks attached to the partition 18. In this configuration, the exterior wall and the interior wall affect each other, so that adjusting the surface step of the exterior wall makes it impossible to get through the interior wall surface. In other words, the existing unit building 1 had a problem in that adjusting the surface step of the exterior wall would result in steps appearing on the interior wall surface.

[0110] In the first embodiment, the upper part (or lower part) of the interior wall panel 30 is fastened to the horizontal support members 22, 122, 222 attached to the beams (ceiling beams 15, floor beams 14). Therefore, it is not necessary to integrate the interior wall and the exterior wall via the wooden bricks described above. Therefore, the exterior wall and the interior wall do not affect each other, so that even if the surface step of the exterior wall is adjusted, no step is generated on the interior wall surface. Furthermore, the interior wall and the exterior wall can be separated and adjusted independently.

[0111] The interior wall installation method of the first embodiment includes an interior wall connecting step of connecting two adjacent interior wall panels 30 installed in the interior wall installation step from the interior side in the width direction (FIG. 5).

[0112] This makes it possible to reduce the step between two adjacent interior wall panels 30. Therefore, a smooth interior wall panel 30 without a step can be constructed. In this case, the step between adjacent interior wall panels 30 can be adjusted by adjusting the screw-in amount of the fastening fixture S2 that attaches the gypsum board 31 to the frame 32 in each interior wall panel 30 from the inside of the room. Also, the attachment position of the upper or lower part of the interior wall panel 30 relative to the building unit 10 can be adjusted by adjusting the screw-in amount of the fastening fixture S3 from the inside of the room.

[0113] In the interior wall installation method of Example 1, in the interior wall connecting process, a lateral protrusion 36 is provided in two adjacent interior wall panels 30, protruding from one interior wall panel 30 toward the other interior wall panel 30, and the lateral protrusion 36 is connected to the other interior wall panel 30 (Figure 5).

[0114] As a result, the lateral projection 36 projecting in the width direction from one interior wall panel 30 and the side edge of the other interior wall panel 30 are overlapped in the direction perpendicular to the surface of the interior wall panel 30, and two adjacent interior wall panels 30 can be easily connected and fixed in the width direction from the inside of the room with fastening fixtures S5 such as screws or bolts. At this time, the step between the side edges of the interior wall panels 30 can also be adjusted from the inside of the room by adjusting the screw-in amount of the fastening fixtures S5 that attach the side edge of the other interior wall panel 30 to the lateral projections 36 provided at multiple points in the vertical direction. EXAMPLES

[0115] The interior wall installation method of Example 2 differs from the interior wall installation method of Example 1 in that it does not have a horizontal support mounting step by using an edge member 35 instead of the horizontal support member 22, etc. In this case, the edge member 35 serves as an auxiliary mounting part for mounting to the interior wall panel 30.

[0116] [Inner wall installation method] 8 is a partially enlarged vertical cross-sectional view for explaining the interior wall installation method of Example 2. The interior wall installation method of Example 2 will be explained below. Note that the same terms or the same symbols are used for explanations of the same or equivalent parts as those explained in the above examples. Also, since the upper and lower parts of the interior wall panel 30 can have the same installation structure, in Example 2, the installation structure of the upper part will be explained. The installation structure of the lower part will be interpreted as necessary.

[0117] (Inner wall installation process) As shown in FIG. 8, in the interior wall installation process, the interior wall panel 30 is oriented vertically and moved approximately horizontally from the inside of the room to the outside of the room, and the upper part of the interior wall panel 30 is installed by abutting it against the ceiling beam 15 (from the inside of the room).

[0118] The interior wall panel 30 is a panel formed by dividing the interior wall into a predetermined size in the width direction. The interior wall is constructed by arranging a plurality of interior wall panels 30 side by side. The interior wall panel 30 is integrally formed of a wooden frame 32 (interior wall frame) and a gypsum board 31 attached to the surface of the frame 32 facing the room. An edge member 35 is further attached to the frame 32. The auxiliary part forming process for attaching the edge member 35 to the frame 32 is performed when manufacturing the interior wall panel 30 (or in the interior wall panel manufacturing process). Compared to Example 1, the interior wall panel 30 is larger in the vertical direction by at least the thickness of the ceiling surface material 17 (or the floor surface material 16), and has a height that reaches the position of the upper surface of the ceiling surface material 17 (or the step lower part 15c of the ceiling joist 15).

[0119] The frame 32 is formed in a rectangular frame shape by an upper horizontal frame 32a, a lower horizontal frame 32b, a left vertical frame 32c, and a right vertical frame 32d. A plurality of horizontal bars 32e are provided between the left vertical frame 32c and the right vertical frame 32d.

[0120] In this way, when the frame 32 and the gypsum board 31 are integrated to form the interior wall panel 30, the frame 32 and the gypsum board 31 become easy to handle, but on the other hand, when the exterior wall is installed first, the exterior wall gets in the way and prevents work from being done from the outside, so there is a restriction that all work to attach the interior wall panel 30 to the inside of the exterior wall can only be done from the inside. Moreover, when the interior wall panel 30 is made, the gypsum board 31 gets in the way and the frame 32 cannot be directly accessed from either the outside or inside of the room, so in order to attach the interior wall panel 30 from the inside of the room, some ingenuity is required, such as providing an auxiliary attachment part.

[0121] In this embodiment, the gypsum board 31 is attached to the frame 32 so as to be aligned to be approximately flush with the upper end (upper horizontal frame 32a) of the frame 32. The gypsum board 31 is attached to the frame 32 approximately perpendicularly by a plurality of fastening fixtures S2 such as screws or bolts.

[0122] The reason why fastening fixtures S2 such as screws or bolts are used to secure the gypsum board 31 to the frame 32 is that the mounting position of the gypsum board 31 in the perpendicular direction to the frame 32 can be adjusted by adjusting the amount of screwing in the screws or bolts (for example, by tightening or loosening them).

[0123] The edge member 35 is a long, narrow, horizontal, strip-like member having a length in the longitudinal direction (perpendicular to the paper surface) approximately equal to the width dimension of the interior wall panel 30. The edge member 35 is placed on the upper ends of the gypsum board 31 and the frame 32 (so as to protrude upward), and is attached from the top to the bottom to the upper end of the frame 32 (upper horizontal frame 32a) with fastening fixtures S7 such as screws or bolts.

[0124] Edge member 35 is placed and fixed to the upper ends of gypsum board 31 and frame 32 with its exterior edge nearly flush with the exterior surface of frame 32 and its interior edge protruding horizontally toward the interior side beyond the interior surface of gypsum board 31. Edge member 35 is formed to have a thickness nearly equal to the height of step portion 15b of ceiling beam 15.

[0125] In the interior wall installation process, the gypsum board 31 is attached to the frame 32 to form an integrated unit, and then the interior wall panel 30 equipped with the edge member 35 is oriented vertically and moved substantially horizontally from the inside of the room, and the edge member 35 is installed by abutting it from below against the ceiling joist 15.

[0126] At this time, the upper surface of the edge member 35 is abutted from below against the portion of the step upper portion 15a on the lower surface of the ceiling joist 15 that protrudes further into the room than the ceiling girders 13. Note that, if necessary, a spacer may be installed between the upper surface of the edge member 35 and the step upper portion 15a to adjust the position.

[0127] The edge of the edge member 35 on the indoor side may be abutted against the corner between the step upper part 15a and the step part 15b on the underside of the ceiling joist 15, or may be separated with a small gap. Note that a spacer may be installed in this gap to adjust the position, if necessary.

[0128] As a result, edge member 35 fits into step upper portion 15a of ceiling joist 15, and is hidden from view from the inside of the room except for the portion protruding toward the inside of the room by ceiling surface material 17 and the upper portion of interior wall panel 30. In addition, the portion of edge member 35 protruding toward the inside of the room is hidden from view from the inside of the room by attaching extension ceiling surface material 117.

[0129] To allow for the installation of edge member 35, step upper portion 15a on the underside of ceiling joist 15 is formed over a wider area than in Example 1. Step portion 15b is displaced toward the interior side compared to Example 1 by the amount of the protruding portion of edge member 35 toward the interior side. At the same time, the position of the end portion of ceiling surface material 17 is also positioned toward the interior side compared to Example 1.

[0130] On the other hand, the upper end of the gypsum board 31 is installed in approximately the same position as in Example 1 in the thickness direction of the interior wall panel 30. Therefore, the upper end of the gypsum board 31 and the end of the ceiling surface material 17 are separated (in the longitudinal direction of the ceiling joist 15) by approximately the amount of the protruding portion of the edge member 35. Therefore, the above-mentioned extension ceiling surface material 117 is installed from below between the upper end of this gypsum board 31 and the end of the ceiling surface material 17.

[0131] The extension ceiling surface material 117 is an elongated horizontal strip-shaped member having the same width as the distance between the upper end of the gypsum board 31 and the end of the ceiling surface material 17, the same thickness as the ceiling surface material 17, and the same length as the width dimension of the interior wall panel 30. It is preferable to use the same material as the ceiling surface material 17 for the extension ceiling surface material 117. The extension ceiling surface material 117 connects the ceiling surface material 17 and the gypsum board 31.

[0132] In addition, before the interior wall panel 30 is installed against the ceiling beams 15, a heat insulating material 41 such as glass wool may be installed between the exterior wall panel 20, the interior wall panel 30, and the partition 18.

[0133] (Fascinating process) As shown in FIG. 8, in the fastening process, the edge member 35 is abutted against the underside of the ceiling joist 15 from below, and the interior wall panel 30 is attached to the ceiling joist 15 via the extension ceiling surface material 117 by fastening fixtures S8 such as screws or bolts. The extension ceiling surface material 117 is attached to the ceiling joist 15 from the inside of the room together with the edge member 35 by the fastening fixtures S8. The fastening fixtures S8 are attached to the extension ceiling surface material 117 and the edge member 35 from the bottom upward. Then, the fastening fixtures S8 penetrate the extension ceiling surface material 117 and the edge member 35 and penetrate into the interior of the ceiling joist 15 by more than the required amount, so that the upper part of the interior wall panel 30 is fixed to the ceiling joist 15.

[0134] That is, the edge members 35 of the interior wall panel 30 are fastened in the vertical direction (up-down direction) by the fastening fixtures S8. Note that the interior wall panel 30 may be fastened in an oblique direction by the fastening fixtures S8 depending on the situation.

[0135] [Inner wall installation structure] The inner wall installation structure created by the inner wall installation method of the second embodiment is, for example, as shown below (for example, when the top and bottom have the same structure). An edge member 35 protruding into the room is attached to the upper end of the interior wall panel 30. An edge member 35 protruding toward the inside of the room is attached to the lower end of the interior wall panel 30. In addition, a plurality of lateral extensions 36 that extend widthwise toward the adjacent interior wall panel 30 (the surface facing the exterior side) are attached to the side edge of the interior wall panel 30 at intervals in the height direction.

[0136] The upper and lower edge members 35 of the interior wall panels 30 are fixed to the beams (ceiling joists 15, floor joists 14) in abutment with fastening fixtures S8 in a substantially vertical direction from the inside of the room. The side edge of one interior wall panel 30 is fixed to the lateral projection 36 of the side edge of the other interior wall panel 30 in a substantially perpendicular manner from the inside of the room by fastening fixtures S5, so that the side edges of adjacent interior wall panels 30 are connected in the width direction at several points via the multiple lateral projections 36.

[0137] [Action and effect of interior wall installation method] The function and effect of the interior wall installation method of Example 2 will be described below. In the interior wall installation method of Example 2, an interior wall is installed on the indoor side of an exterior wall attached to a building unit 10 having beams (ceiling joists 15, floor joists 14) and a column 11. This interior wall installation method includes an interior wall installation step of installing a gypsum board 31 on a frame 32 and installing an interior wall panel 30 having an edge member 35 protruding from the gypsum board 31 to the upper or lower end of the gypsum board 31 in a state in which the edge member 35 abuts against the beams (ceiling joists 15, floor joists 14) (from the lower or upper side), and a fastening step of fastening the beams (ceiling joists 15, floor joists 14) and the edge member 35 (from the indoor side in the vertical direction) (FIG. 8).

[0138] In this case, the mounting auxiliary portion is an edge member 35 that protrudes from the interior wall panel 30 toward the inside of the room, and in the auxiliary portion forming process, the edge member 35 is attached to the upper or lower end of the interior wall panel 30 when the interior wall panel 30 is manufactured (interior wall panel manufacturing process), and in the interior wall installation process, the interior wall panel 30 is installed from the inside of the room with the edge member 35 abutting the beams (ceiling joists 15, floor joists 14) provided on the upper or lower surface of the building unit 10 from the lower or upper side, and in the fastening process, the beams (ceiling joists 15, floor joists 14) and the edge member 35 are fastened upward or downward from the inside of the room.

[0139] This allows the interior wall to be formed by attaching the interior wall panel 30, to which the gypsum board 31 has already been attached to the frame 32 and the edge member 35 has also been attached, to the beams (ceiling joists 15, floor joists 14) all at once. Therefore, for example, after attaching the wooden battens (or frames) that serve as the foundation to the sides of the building unit 10 in a factory, a worker does not need to attach the gypsum board 31 to the wooden battens with a large number of fastening fixtures S3 such as screws or bolts, or, for example, to attach the frame 32 and the gypsum board 31 separately to the building unit 10 in a factory. This makes it possible to significantly reduce the man-hours required to attach the gypsum board 31 to the building unit 10.

[0140] In addition, since the gypsum board 31 is attached to the frame 32 in advance to form the interior wall panel 30, the manufacture of the interior wall panel 30 can be automated, for example, by a machine. The edge member 35 can also be easily attached to the interior wall panel 30. In addition, the work of attaching the gypsum board 31 to the frame 32 to form an integrated interior wall panel 30 to the building unit 10 can also be automated. This improves work efficiency. Furthermore, the automation allows the gypsum board 31 to be accurately attached to the desired position of the frame 32. As a result, work efficiency can be improved and quality can be stabilized.

[0141] Then, the interior wall panel 30 is attached to the beams (ceiling joists 15, floor joists 14) from the inside of the room in the vertical direction via the edge members 35. Therefore, even if an exterior wall is attached to the building unit 10, the interior wall panel 30 can be attached without being hindered by the exterior wall.

[0142] Other configurations and functions and effects are substantially the same as those of the above embodiment, so description thereof will be omitted. EXAMPLES

[0143] The inner wall installation method of the third embodiment differs from the inner wall installation method of the first embodiment in that the mounting positions of the horizontal supports 21, 121 are different.

[0144] [Inner wall installation method] 9 is a partially enlarged vertical cross-sectional view for explaining the inner wall installation method of Example 3. The inner wall installation method of Example 3 will be explained below. Note that the same terms or the same symbols are used for explanations of the same or equivalent parts as those explained in the above examples. Also, since the upper and lower parts of the inner wall can have the same installation structure, only the installation structure of the lower part will be explained in Example 3. The installation structure of the upper part will be interpreted as necessary.

[0145] (Horizontal support installation process) As shown in Fig. 9, in the horizontal support installation process, the horizontal support 21 is attached to the floor surface material 16 (not the floor beam 14) by means of fastening fixtures S1 such as screws or bolts. In this case, the horizontal support 21 becomes the installation auxiliary part that is attached to the building unit 10. The horizontal support installation process also becomes the auxiliary part formation process. The floor beam 14 has a straight, flat surface over its entire upper surface, and the floor surface material 16 is installed up to a position near the end of the floor beam 14 (near the floor beam 12). The floor beam 14 is attached to the floor beam 12 via stiffeners 14a.

[0146] The horizontal support member 21 is formed, for example, from wood having a rectangular cross section. The horizontal support member 21 is installed horizontally so as to extend between two adjacent pillars 11 in the longitudinal direction (direction perpendicular to the paper surface). The horizontal support member 21 is installed over at least an area that is approximately equal to or slightly wider than the width dimension of the entire interior wall. In other words, the horizontal support member 21 is formed to extend between two adjacent pillars 11 without interruption. However, the horizontal support member 21 may be a single piece, or may be installed in multiple separate members. The horizontal support member 21 may be, for example, a plurality of members each having a length approximately equal to the width dimension of the interior wall panel 30, arranged to extend.

[0147] The horizontal support member 21 is attached to the upper end surface of the floor joist 14 via the floor surface material 16 by the fastening fixture S1 so as to protrude upward from the upper surface of the floor surface material 16. In other words, the horizontal support member 21 is attached to the upper surface of the floor surface material 16 so as to protrude upward from the upper surface of the floor surface material 16.

[0148] The fastening fixture S1 is attached to the horizontal support member 21 from above downward. Then, the fastening fixture S1 penetrates the horizontal support member 21 and the floor surface material 16 and penetrates into the floor joist 14 by a required amount or more, thereby fixing the horizontal support member 21 to the floor joist 14 via the floor surface material 16. In other words, the horizontal support member 21 is fastened in the vertical direction by the fastening fixture S1. Note that the horizontal support member 21 may be fastened in an oblique direction inclined from the vertical direction by the fastening fixture S1 depending on the situation.

[0149] (Inner wall installation process) 9, in the interior wall installation process, the interior wall panel 30 is oriented vertically and moved in an approximately horizontal direction from the interior side to the exterior side, and the lower part of the interior wall panel 30 is installed by abutting (from the interior side) the horizontal support material 21. In this way, the horizontal support material 21 is hidden by the lower part of the interior wall panel 30 so that it cannot be seen from the interior side.

[0150] The interior wall panels 30 are formed by dividing the interior wall into panels of a specified size in the width direction. The interior wall is constructed by installing a plurality of interior wall panels 30 side by side. The interior wall panel 30 is integrally constructed of a wooden frame 32 (interior wall frame) and gypsum board 31 attached to the surface of the frame 32 facing the room. The interior wall panel 30 is formed at a height approximately equal to the distance between the upper surface of the floor surface material 16 and the lower surface of the ceiling surface material 17.

[0151] The frame 32 is formed in a rectangular frame shape by an upper horizontal frame 32a, a lower horizontal frame 32b, a left vertical frame 32c, and a right vertical frame 32d. A plurality of horizontal bars 32e are provided between the left vertical frame 32c and the right vertical frame 32d.

[0152] In this way, when the frame 32 and the gypsum board 31 are integrated to form the interior wall panel 30, the frame 32 and the gypsum board 31 become easy to handle, but on the other hand, when the exterior wall is installed first, the exterior wall gets in the way and prevents work from being done from the outside, so there is a restriction that all work to attach the interior wall panel 30 to the inside of the exterior wall can only be done from the inside. Moreover, when the interior wall panel 30 is made, the gypsum board 31 gets in the way and the frame 32 cannot be directly accessed from either the outside or inside of the room, so in order to attach the interior wall panel 30 from the inside of the room, some ingenuity is required, such as providing an auxiliary attachment part.

[0153] In this embodiment, the gypsum board 31 is attached to the frame 32 so as to form a protruding portion 31a that protrudes downward from the lower end of the frame 32 (lower horizontal frame 32b).

[0154] The protruding portion 31a protrudes upward by approximately the same amount as the protruding amount of the horizontal support member 21 from the upper surface of the floor material 16. Since the height of the interior wall panel 30 is fixed, the frame 32 is formed so that its lower end (lower horizontal frame 32b) is higher by the amount of the protruding portion 31a. The gypsum board 31 is attached to the frame 32 approximately perpendicularly by a plurality of fastening fixtures S2 such as screws or bolts.

[0155] The reason why fastening fixtures S2 such as screws or bolts are used to secure the gypsum board 31 to the frame 32 is that the mounting position of the gypsum board 31 in the perpendicular direction to the frame 32 can be adjusted by adjusting the amount of screwing in the screws or bolts (for example, by tightening or loosening them).

[0156] The protruding portion 31a may be provided with a cushioning material 33 so as to cover the surface on the exterior side. That is, the cushioning material 33 is attached to the side of the protruding portion 31a to which the frame 32 is attached. The cushioning material 33 may be provided on the protruding portion 31a of the above-mentioned embodiment.

[0157] The cushioning material 33 may be, for example, wood. The cushioning material 33 is a member that is approximately the same height as the protruding portion 31a and thinner than the frame 32 (the lower horizontal frame 32b thereof). The cushioning material 33 is attached to the protruding portion 31a by fastening fixtures (not shown), such as screws or bolts. The cushioning material 33 may also be attached to the protruding portion 31a by adhesive or the like. It is not necessary to provide the cushioning material 33 on the protruding portion 31a.

[0158] In the interior wall installation process, the interior wall panel 30, which is formed by attaching the gypsum board 31 to the frame 32 and integrating it, is turned upright and moved almost horizontally from the inside of the room to the outside of the room, and the cushioning material 33 or the protruding part 31a is installed by abutting it against the horizontal support material 21 (from the inside of the room). At this time, the outside surface of the cushioning material 33 or the protruding part 31a is abutted against the indoor surface of the horizontal support material 21 (from the inside of the room). At least a part of the lower end of the frame 32 faces and is in almost abutting contact with the upper surface of the horizontal support material 21. The lower end of the gypsum board 31 is almost butted against the vicinity of the end of the floor material 16 from above.

[0159] In addition, before the interior wall panel 30 is installed in contact with the horizontal support 21, a heat insulating material 41 such as glass wool may be installed between the exterior wall panel 20, the interior wall panel 30, and the partition 18.

[0160] (Fascinating process) As shown in FIG. 9, in the fastening process, the buffer material 33 is abutted against the side surface of the horizontal support material 21 from the indoor side, and the interior wall panel 30 is attached to the horizontal support material 21 by fastening fixtures S3 such as screws or bolts. The fastening fixtures S3 are attached from the indoor side of the interior wall panel 30 toward the outdoor side, almost perpendicular to the surface. The fastening fixtures S3 penetrate the gypsum board 31 and the buffer material 33 and penetrate into the horizontal support material 21 by a required amount or more, so that the lower part of the interior wall panel 30 is fixed to the horizontal support material 21. That is, the interior wall panel 30 is fastened horizontally by the fastening fixtures S3. Depending on the situation, the interior wall panel 30 may be fastened by the fastening fixtures S3 in an oblique direction inclined with respect to the horizontal direction.

[0161] [Modification of Example 3] 10 is a partially enlarged vertical cross-sectional view showing a modified example of the inner wall installation method of the embodiment 3. The modified example of the inner wall installation method of the embodiment 3 will be described below. Note that the inner wall connecting step has the same configuration as the above embodiment, so the description will be omitted.

[0162] (Horizontal support installation process) As shown in Fig. 10, in the horizontal support mounting step, the horizontal support 121 is mounted to the floor surface material 16 by means of fastening fixtures S1 such as screws or bolts. In this case, the horizontal support 121 serves as a mounting auxiliary part that is mounted to the building unit 10. The horizontal support mounting step serves as an auxiliary part forming step. The floor joists 14 have a straight, flat surface over the entire upper surface, and the floor surface material 16 is installed up to a position near the end of the floor joists 14 (near the floor girders 12). The floor joists 14 are mounted to the floor girders 12 via stiffeners 14a.

[0163] The horizontal support member 121 is formed, for example, of an L-shaped metal fitting (or angle member) with an L-shaped cross section. The horizontal support member 121 is installed horizontally so as to extend between two adjacent columns 11 in the longitudinal direction (direction perpendicular to the paper surface). The horizontal support member 121 is installed over at least an area that is approximately equal to or slightly wider than the width dimension of the entire interior wall. In other words, the horizontal support member 121 is formed to pass through between two adjacent columns 11 without interruption. However, the horizontal support member 121 may be a single piece, or may be installed in multiple pieces. The horizontal support member 121 may be, for example, a plurality of members with a length approximately equal to the width dimension of the interior wall panel 30 arranged to extend.

[0164] The horizontal support member 121 is attached to the upper surface of the end portion of the floor joist 14 via the floor surface material 16 by the fastening fixture S1 so as to protrude upward from the upper surface of the floor surface material 16. In other words, the horizontal support member 121 is attached to the upper surface of the floor surface material 16 so as to protrude upward from the upper surface of the floor surface material 16. Note that the portion of the end portion of the floor joist 14 where the horizontal support member 121 is attached may be formed from a separate member from the other portions.

[0165] More specifically, horizontal support member 121 (L-shaped metal fitting) having an L-shaped cross section has horizontal surface portion 121a and vertical surface portion 121b. Vertical surface portion 121b is installed at a position near the end of floor surface material 16. Horizontal surface portion 121a extends from the lower end of vertical surface portion 121b toward the room side, and is placed and fixed in a state of abutting against the upper surface of floor surface material 16 near the end. Vertical surface portion 121b protrudes upward from the upper surface of floor surface material 16 at a position near the end of floor surface material 16. Horizontal surface portion 121a has a width dimension approximately the same as the thickness of lower horizontal frame 32b of frame 32.

[0166] The fastening fixture S1 is attached to the horizontal support member 121 from above downward. The fastening fixture S1 penetrates the horizontal support member 121 (the lateral surface portion 121a) and the floor surface material 16 and penetrates into the floor joist 14 by a required amount or more, thereby fixing the horizontal support member 121 to the floor joist 14 via the floor surface material 16. In other words, the horizontal support member 121 is fastened in the vertical direction by the fastening fixture S1. Note that the horizontal support member 121 may be fastened in an oblique direction inclined from the vertical direction by the fastening fixture S1 depending on the situation.

[0167] (Inner wall installation process) As shown in Fig. 10, in the interior wall installation process, the interior wall panel 30 is oriented vertically and moved in an approximately horizontal direction from the interior side to the exterior side, and the lower part of the interior wall panel 30 is installed by abutting (from the interior side) the horizontal support member 121 (the vertical surface part 121b of the horizontal support member 121). As a result, the horizontal support member 121 is hidden by the lower part of the interior wall panel 30 so that it cannot be seen from the interior side.

[0168] The interior wall panels 30 are formed by dividing the interior wall into panels of a specified size in the width direction. The interior wall is constructed by installing a plurality of interior wall panels 30 side by side. The interior wall panel 30 is integrally constructed of a wooden frame 32 (interior wall frame) and gypsum board 31 attached to the surface of the frame 32 facing the room. The interior wall panel 30 is formed at a height approximately equal to the distance between the upper surface of the floor surface material 16 and the lower surface of the ceiling surface material 17.

[0169] The frame 32 is formed in a rectangular frame shape by an upper horizontal frame 32a, a lower horizontal frame 32b, a left vertical frame 32c, and a right vertical frame 32d. A plurality of horizontal bars 32e are provided between the left vertical frame 32c and the right vertical frame 32d.

[0170] In this way, when the frame 32 and the gypsum board 31 are integrated to form the interior wall panel 30, the frame 32 and the gypsum board 31 become easy to handle, but on the other hand, when the exterior wall is installed first, the exterior wall gets in the way and prevents work from being done from the outside, so there is a restriction that all work to attach the interior wall panel 30 to the inside of the exterior wall can only be done from the inside. Moreover, when the interior wall panel 30 is made, the gypsum board 31 gets in the way and the frame 32 cannot be directly accessed from either the outside or inside of the room, so in order to attach the interior wall panel 30 from the inside of the room, some ingenuity is required, such as providing an auxiliary attachment part.

[0171] In this embodiment, the lower end of the gypsum board 31 is attached to the frame 32 so as to be aligned to be at approximately the same height as the lower end (lower horizontal frame 32b) of the frame 32. The gypsum board 31 is attached to the frame 32 approximately perpendicularly by a plurality of fastening fixtures S2 such as screws or bolts.

[0172] The reason why fastening fixtures S2 such as screws or bolts are used to secure the gypsum board 31 to the frame 32 is that the mounting position of the gypsum board 31 in the perpendicular direction to the frame 32 can be adjusted by adjusting the amount of screwing in the screws or bolts (for example, by tightening or loosening them).

[0173] In the interior wall installation process, the interior wall panel 30, which is formed by attaching the gypsum board 31 to the frame 32 and integrating it with the frame 32, is turned upright and moved in an almost horizontal direction from the inside of the room to the outside of the room, and the frame 32 is installed by abutting (from the inside of the room) the horizontal support 121. At this time, the outside surface of the lower part of the frame 32 abuts against the vertical surface 121b of the horizontal support 121, the lower end of the frame 32 faces and almost abuts against the horizontal surface 121a of the horizontal support 121, and the lower end of the gypsum board 31 is almost butted against the vicinity of the end of the floor surface material 16 from above.

[0174] Before the interior wall panel 30 is installed against the horizontal support 121, a heat insulating material 41 such as glass wool may be installed between the exterior wall panel 20, the interior wall panel 30, and the studs 18.

[0175] (Fascinating process) 10, in the fastening step, with the frame 32 abutting against the vertical surface 121b of the horizontal support 121 from the inside of the room, the interior wall panel 30 is attached to the horizontal support 121 by fastening fixtures S3 such as screws or bolts. The fastening fixtures S3 are attached to the interior wall panel 30 almost perpendicularly from the inside of the room toward the outside of the room. The fastening fixtures S3 then penetrate the gypsum board 31 and the frame 32, and further penetrate the vertical surface 121b of the horizontal support 121, thereby fixing the lower part of the interior wall panel 30 to the horizontal support 121. That is, the interior wall panel 30 is fastened horizontally by the fastening fixtures S3.

[0176] Depending on the situation, the interior wall panel 30 may be fastened in an oblique direction inclined with respect to the horizontal direction by the fastening fixture S3.

[0177] [Inner wall installation structure] The inner wall installation structure created by the inner wall installation method of the third embodiment is, for example, as shown below (for example, when the top and bottom have the same structure). Horizontal supports 21, 121 are attached to the ceiling surface material 17, protruding downward from the ceiling surface material 17 and extending between the pillars 11. Horizontal supports 21, 121 are attached to the floor surface material 16, protruding above the floor surface material 16 and extending between the pillars 11. In addition, a plurality of lateral extensions 36 that extend widthwise toward the adjacent interior wall panel 30 (the surface facing the exterior side) are attached to the side edge of the interior wall panel 30 at intervals in the height direction.

[0178] The upper and lower ends of the interior wall panels 30 are fixed to the horizontal supports 21, 121 from the inside of the room by fastening fixtures S3, respectively, almost perpendicular to their faces. Also, the side edge of one interior wall panel 30 is fixed to the lateral protrusion 36 of the side edge of the other interior wall panel 30 from the inside of the room by fastening fixtures S5, so that the side edges of adjacent interior wall panels 30 are connected in the width direction at several points via the multiple lateral protrusions 36.

[0179] In the above, the upper end side and the lower end side of the inner wall panel 30 are the same as each other, but the upper end side and the lower end side do not necessarily have to have the same structure. For example, in the inner wall installation structure of Fig. 3, the upper end side of the inner wall panel 30 is the horizontal support member 22 (Fig. 3) of Example 1, and the lower end side of the inner wall panel 30 is the horizontal support member 21 (Fig. 9) of Example 3. In other words, the inner wall installation structure of Fig. 3 is a combination of Example 1 and Example 3. The structures of the respective examples can be combined as appropriate.

[0180] [Action and effect of interior wall installation method] The operation and effect of the interior wall installation method of the third embodiment will be described below. In the interior wall installation method of the third embodiment, an interior wall is constructed on the indoor side of an exterior wall attached to a building unit 10 having beams (floor joists 14 or ceiling joists 15) and columns 11. This interior wall installation method includes a horizontal support member installation step of attaching horizontal supports 21, 121 extending between the columns 11 to a floor surface material 16 or a ceiling surface material 17 attached to the beams (floor joists 14 or ceiling joists 15) so as to protrude above the floor surface material 16 or below the ceiling surface material 17, and an interior wall installation step of installing an interior wall panel 30 having a gypsum board 31 attached to a frame 32 by abutting the horizontal supports 21, 121 from the indoor side (FIG. 9).

[0181] In this case, the mounting auxiliary part is a horizontal support member 21, 121 extending between adjacent columns 11 provided on the building unit 10 so as to protrude above the floor surface material 16 or below the ceiling surface material 17 installed on the beams (ceiling joists 15, floor joists 14) provided on the upper or lower surface of the building unit 10, and the auxiliary part formation process is a horizontal support member installation process in which the horizontal support member 21, 121 is attached to the floor surface material 16 or ceiling surface material 17, and in the interior wall installation process, the interior wall panel 30 is installed by abutting it against the horizontal support member 21, 121 from the inside of the room, and in the fastening process, the interior wall panel 30 and the horizontal support member 21, 121 are fastened from the inside of the room.

[0182] This allows the interior wall to be formed by attaching the interior wall panel 30, on which the gypsum board 31 has been attached to the frame 32 in advance, to the horizontal support members 21, 121 installed on the floor surface material 16 or the ceiling surface material 17 at one time. Therefore, for example, after attaching the wooden battens (or frames) that serve as the foundation to the sides of the building unit 10 in a factory, a worker does not need to attach the gypsum board 31 to the wooden battens with a large number of fastening fixtures S3 such as screws or bolts, or, for example, to attach the frame 32 and the gypsum board 31 separately to the building unit 10 in a factory. This makes it possible to significantly reduce the man-hours required to attach the gypsum board 31 to the building unit 10.

[0183] In addition, the work of attaching the gypsum board 31 to the frame 32 in advance and the work of attaching the gypsum board 31 to the frame 32 and the integrated interior wall panel 30 to the building unit 10 can be automated, for example, by a machine, etc. Therefore, the efficiency of the work can be improved and the quality can be stabilized.

[0184] Then, the interior wall panel 30 is attached to the horizontal support members 21, 121 from the indoor side. Therefore, even when an exterior wall is attached to the building unit 10, the interior wall panel 30 can be attached without being hindered by the exterior wall.

[0185] In the interior wall installation method of Example 3, the gypsum board 31 has a protrusion 31a that protrudes from the upper or lower end of the frame 32, and a cushioning material 33 is attached to the side of the protrusion 31a to which the frame 32 is attached (Figure 9).

[0186] This makes it possible to protect the protruding portion 31a of the gypsum board 31 with the buffer material 33. Therefore, when the interior wall panel 30 is transported, the buffer material 33 can prevent the gypsum board 31 from being damaged.

[0187] In addition, when the interior wall panel 30 abuts against the horizontal support 21, 121, the cushioning material 33 can protect the interior wall panel 30. Therefore, the interior wall panel 30 can be slid while abutting against the horizontal support 21, 121. As a result, the position of the interior wall panel 30 can be finely adjusted while protecting the interior wall panel 30.

[0188] Other configurations and functions and effects are substantially the same as those of the above embodiment, so description thereof will be omitted. EXAMPLES

[0189] A preferred interior wall installation structure and an interior wall installation method using the configuration of the above embodiment will be specifically described below. Fig. 11 is a partially exploded perspective view showing the state in which the interior wall panel 30 is attached to the side of the building unit 10, for explaining the interior wall installation structure. Fig. 12 is a vertical cross-sectional view seen from the side showing the side of the building unit 10 to which the interior wall panel 30 is attached. Fig. 13 is a view showing the lower part of the side of the building unit 10. Fig. 14 is a horizontal cross-sectional view showing the building fixing part 43 provided at the middle part in the height direction of the interior wall panel 30. Fig. 15 is a process diagram for explaining the interior wall installation method. Fig. 16 is a schematic plan view showing the interior wall panel 30 manufactured by nailing.

[0190] [Inner wall installation structure] The inner wall installation structure of this embodiment is as follows. An interior wall is formed by installing a plurality of interior wall panels 30 on the indoor side of an exterior wall attached to a building unit 10 having beams (floor beams 14 or ceiling beams 15) and columns 11. A horizontal support member 122 is attached to the beam (ceiling joist 15), protruding below the ceiling surface material 17 and extending between the pillars 11. An edge member 135 protruding inside the room is attached to the lower end of the interior wall panel 30, which has a plaster board 31 attached to a frame 32.

[0191] The upper end of the interior wall panel 30 is fixed to the horizontal support member 122 from the inside of the room by fastening fixtures S3 in a substantially perpendicular manner. The edge member 135 at the lower end of the interior wall panel 30 is fixed to the beam (floor joist 14) from the inside of the room in a substantially vertical direction by fastening fixtures S8.

[0192] Here, horizontal support member 122 (Fig. 12) attached to ceiling joist 15 is an auxiliary attachment part attached to building unit 10, and for example, the same one as in Fig. 6 is used. Horizontal support member 122 is attached by utilizing the stepped shape of the underside of the end of ceiling joist 15, so it is easy to position and fix. Note that horizontal support member 122 may be one of the other embodiments or modified examples (horizontal support members 22, 222).

[0193] The edge member 135 (Fig. 13) is an auxiliary attachment part attached to the interior wall panel 30, and is basically similar to the edge member 35 in Fig. 8 and is attached to the lower end side of the interior wall panel 30. The auxiliary part forming process for attaching the edge member 135 to the (frame 32 of) the interior wall panel 30 is performed when manufacturing the interior wall panel 30 (in the panel manufacturing process). The end of the floor surface material 16 is displaced toward the interior side by the amount of the edge member 135 so that the edge member 135 abuts from above against the part of the upper surface of the end of the floor joist 14 that is exposed to the outside of the room. The edge member 135 is positioned by abutting against the end of the floor surface material 16 from the outside of the room. The edge member 135 is attached by utilizing the step between the end of the floor surface material 16 and the floor joist 14, so that it is easy to position and fix it.

[0194] In this case, the edge member 135 has the same plate thickness as the floor surface material 16, and the portion protruding from the lower end of the interior wall panel 30 into the room is attached from the top to the bottom with fastening fixtures S8 to the top surface of the floor joist 14. As a result, the top surface of the edge member 135 is almost flush with the top surface of the floor surface material 16, so there is no particular need to use the extension ceiling surface material 117 in Figure 8. Furthermore, in the interior wall installation structure of this embodiment, a lateral extension 136 that extends widthwise toward the adjacent interior wall panel 30 may be attached to the side edge of the interior wall panel 30. The lateral projection 136 may extend continuously in the height direction of the interior wall panel 30 .

[0195] The side edge of one interior wall panel 30 is fixed almost perpendicularly to the lateral extension 36 of the side edge of the other interior wall panel 30 from the inside of the room by fastening fixture S5, so that the side edges of adjacent interior wall panels 30 are connected in the width direction via the lateral extension 136 that extends continuously in the vertical direction.

[0196] Here, the horizontal extension 136 (FIG. 14) is an auxiliary attachment part attached to the interior wall panel 30, and may be the same as the horizontal extension 36 (split horizontal extension) in FIG. 5, but it is preferable to use a long piece of wood (continuous horizontal extension) that has a cross-sectional shape similar to that of the horizontal extension 36 in FIG. 5 and extends continuously over almost the entire height of the interior wall panel 30. However, the upper and lower ends of the horizontal extension 136 are long enough not to interfere with the horizontal support member 122 or the edge member 135. The horizontal extension 136 is installed on the exterior surfaces of the adjacent left vertical frame 32c and right vertical frame 32d of the adjacent interior wall panels 30. The horizontal extension 136 may be a single member, or may be provided as a plurality of separate members. When it is divided into a plurality of members, it may be installed with some gaps as long as it can be said that the members are generally in a continuous state. The horizontal extension 136 can be used in other embodiments. The auxiliary portion forming process for attaching the lateral extension portion 136 to the interior wall panel 30 (the frame 32 thereof) is carried out when the interior wall panel 30 is manufactured (in the panel manufacturing process).

[0197] In this case, the width of the horizontal extension 136 may be slightly narrower than the sum of the widths of the adjacent left vertical frame 32c and right vertical frame 32d of the adjacent interior wall panels 30. The horizontal extension 136 is installed so that the position of its end in the width direction is slightly offset (recessed to the left) from the position of the inner surface of the left vertical frame 32c in the frame 32 constituting one of the interior wall panels 30. In this state, the horizontal extension 136 may be attached to the left vertical frame 32c to form a step 42 between the end of the horizontal extension 136 and the left vertical frame 32c.

[0198] As a result, when one of the interior wall panels 30 is attached to the building fixing part 43 described below, the step 42 can suppress and prevent the heat insulating material 41 installed inside the frame 32 from protruding from the left vertical frame 32c and being pinched between the left vertical frame 32c and the building fixing part 43 (pinching prevention part). A similar step 42 may be formed between the right vertical frame 32d of the other interior wall panel 30 and the end of the horizontal protrusion 136.

[0199] Furthermore, a building fixing part 43 (FIG. 14) that fixes one position of the middle part in the height direction at the side edge of the interior wall panel 30 may be attached to the building unit 10. Then, one position of the middle part in the height direction of the lateral projection part 136 that is attached to the side edge of the interior wall panel 30 and extends continuously in the height direction is fixed to the building fixing part 43 of this building unit 10.

[0200] Here, the building fixing part 43 is a wooden brick provided at the middle (approximately the center) in the height direction of the partition 18. The partition 18 is installed at the side edge position of the interior wall panel 30. The building fixing part 43 is fitted into the opening surface facing the interior side of the partition 18 made of an inwardly C-shaped channel steel from the inside of the room, and is fixed from the outside of the room (by a fastening fixture not shown). The building fixing part 43 is formed to be wider than the lateral projection part 136.

[0201] The indoor surface of the building fixing part 43 protrudes a required amount from the opening surface of the partition 18, and the outdoor surface of the horizontal extension part 136 abuts against it. The horizontal extension part 136 abuts against the indoor surface of the building fixing part 43, so that the side surface of the interior wall panel 30 is positioned in a direction substantially perpendicular to the surface. In this state, the fastening fixture S9 is attached from the indoor side so as to penetrate the gypsum board 31 and the frame 32 (the adjacent left vertical frame 32c and the right vertical frame 32d) constituting the side edge parts of a pair of adjacent interior wall panels 30, and enter the inside of the building fixing part 43. As a result, the middle part in the height direction of the side edge parts of the adjacent interior wall panels 30 is fixed to the building fixing part 43 from the indoor side by the fastening fixture S9 substantially perpendicular (horizontally) (panel middle part building fixing process).

[0202] A plurality of building fixing parts 44 (FIG. 11) similar to the building fixing part 43 are installed at intervals in the height direction at positions along the pillar 11 of the building unit 10. The interior wall panel 30 installed at the position closest to the pillar 11 has a plurality of parts in the height direction of the right vertical frame 32d installed along the pillar 11 attached to the plurality of building fixing parts 44 from the inside of the room by fastening fixtures S10, substantially perpendicular (horizontally).

[0203] [Inner wall installation method] In this embodiment, as shown in FIG. 15, the inner wall installation method is carried out in sequence from the left side to the right side of the figure.

[0204] First, in the panel manufacturing process, a frame 32 is assembled, and a plaster board 31 is attached to the frame 32 to form an interior wall panel 30. To attach the plaster board 31 to the frame 32, a fastening fixture S2 such as a screw or a bolt may be used as in the above-mentioned embodiments, but in this embodiment, a driving fixture such as a nail N is used as shown in Fig. 16 instead of a fastening fixture S2 such as a screw or a bolt.

[0205] In each of the above-mentioned embodiments, fastening fixtures S2 such as screws or bolts were used to fix the gypsum board 31 to the frame 32 because, as mentioned above, the attachment position of the gypsum board 31 in the perpendicular direction to the frame 32 can be adjusted by adjusting the amount of screwing in the screws or bolts (for example, by tightening or loosening them).

[0206] In this case, about 80 fastening fixtures S2 such as screws or bolts are used to manufacture one interior wall panel 30. This is because the weight of the gypsum board 31 is large, and the fastening fixtures S2 must be driven in at a very fine pitch to suppress deformation due to external forces such as earthquakes.

[0207] However, when manufacturing the interior wall panels 30, if screws are used, it takes five seconds to screw in one screw. Therefore, it takes a considerable amount of time to manufacture one interior wall panel 30. Moreover, one building unit 10 uses approximately 70 interior wall panels 30. Therefore, improving the manufacturing efficiency of the interior wall panels 30 is a very important issue.

[0208] In contrast, it takes one second to drive a nail N into one location. Therefore, by changing from screwing to nailing, the manufacturing time of the interior wall panel 30 can be significantly shortened. However, nailing makes it impossible to adjust the mounting position of the gypsum board 31 in the direction perpendicular to the surface of the frame 32 (or adjust the step). Therefore, nailing was not adopted in the above-mentioned embodiments. However, in this embodiment 4, it is possible to manufacture the interior wall panel 30 by nailing for reasons that will be described later.

[0209] Next, an auxiliary part forming process is performed as part of the panel manufacturing process (or as a subsequent process of the panel manufacturing process), and an edge member 135 serving as an attachment auxiliary part is attached from below to the lower end of the interior wall panel 30 with fastening fixtures S7. Also, a lateral extension part 136 serving as an attachment auxiliary part is attached to the side edge part of the interior wall panel 30 from the outside of the room with fastening fixtures S4 almost perpendicular to the surface. Since the interior wall panel 30 is sufficiently smaller than the building unit 10, it is relatively easy to attach the edge member 135 and the lateral extension part 136 to the interior wall panel 30, and attachment precision can be easily achieved.

[0210] Next, in the horizontal support installation process, the horizontal support 122 is attached from below to the underside of the end of the ceiling joist 15 with fastening fixtures S1. Since the underside of the end of the ceiling joist 15 has a stepped shape, the installation of the horizontal support 122 to the ceiling joist 15 can be easily achieved by utilizing the stepped shape, and installation accuracy can be easily achieved. At this time, the exterior wall and studs 18 have already been installed to the building unit 10.

[0211] Then, in the interior wall installation process, the interior wall panel 30 is installed between the floor girders 12 and the ceiling girders 13 from the inside of the room.

[0212] Furthermore, in a fastening process, the upper end of the interior wall panel 30 is attached to the horizontal support member 122 from the inside of the room with fastening fixtures S3, approximately perpendicular to the surface. Also, the edge member 135 at the lower end of the interior wall panel 30 is attached downward from the inside of the room to the floor joist 14 with fastening fixtures S8. Furthermore, as a panel middle part building fixing process, one position in the middle part in the height direction of the side edge of the interior wall panel 30 is attached to the building fixing part 43 from the inside of the room with fastening fixtures S9, approximately perpendicular to the surface. In this way, one of the interior wall panels 30 is attached to the side surface of the building unit 10 with high precision.

[0213] Then, in the same manner as above, one interior wall panel 30 is attached to the side surface of the building unit 10 adjacent to the other interior wall panel 30. The other interior wall panel 30 is fixed to the building unit 10 at the top and bottom ends and at one position in the middle of the height direction of the side edge.

[0214] Furthermore, in the interior wall connecting process, the right vertical frame 32d of the other interior wall panel 30 is attached perpendicularly to the horizontal extension 136 attached to one of the interior wall panels 30 from the inside of the room using a fastening fixture S5. At this time, since the horizontal extension 136 extends continuously in the height direction, it can be attached at any position in the height direction, so the fastening fixture S5 is attached at the optimal position that can eliminate the step between the side edges of the interior wall panels 30 depending on the situation on site.

[0215] At this time, as a panel middle part building fixing process, one position in the middle part in the height direction of the side edge part (right vertical frame 32d) of the other interior wall panel 30 is attached from the inside of the room with a fastening fixture S9 to the same building fixing part 43 as the side edge part of one interior wall panel 30, almost perpendicular to the surface. Also, one position in the middle part in the height direction of the opposite side edge part (left vertical frame 32c) of the other interior wall panel 30 is attached from the inside of the room with a fastening fixture S9 to another building fixing part 43, almost perpendicular to the surface. In this way, the other interior wall panel 30 is attached to the side surface of the building unit 10 with high precision.

[0216] Then, by repeating the above process and attaching the interior wall panels 30 sideways, an interior wall without any steps is formed along the entire side surface of the building unit 10.

[0217] The details of each step are almost the same as those in the above-mentioned embodiments.

[0218] [Effects of interior wall installation structure and method] The effects of the interior wall installation structure and method of Example 4 will be described below. In the interior wall installation method of Example 4, the installation auxiliary parts are horizontal support members 22, 122, 222 that protrude below the ceiling surface material 17 installed on the beam (ceiling joist 15) installed on the upper surface of the building unit 10 and extend between adjacent columns 11 installed on the building unit 10, and an edge member 135 that protrudes from the lower end of the interior wall panel 30 toward the room side, and the auxiliary part formation process includes a horizontal support member installation process for attaching the horizontal support members 22, 122, 222 to the beam (ceiling joist 15) on the upper surface of the building unit 10, and a step of ... interior wall panel 30 during the manufacture of the interior wall panel 30 (interior wall panel manufacturing process). In the interior wall installation process, the upper end of the interior wall panel 30 is installed by abutting it against the horizontal supports 22, 122, 222 from the inside of the room, and the lower end of the interior wall panel 30 is installed from the inside of the room with the edge member 135 abutting from above against the beams (floor joists 14) provided on the underside of the building unit 10. In the fastening process, the interior wall panel 30 and the horizontal supports 22, 122, 222 are fastened together from the inside of the room, and the beams (ceiling joists 15) and the edge member 135 are fastened together upwards or downwards from the inside of the room, thereby forming the above-mentioned interior wall installation structure.

[0219] The horizontal support 122 (attached to the beam (ceiling beam 15)) may support the upper end of the interior wall panel 30 from the outside of the room. By abutting the upper end of the interior wall panel 30 against the horizontal support 122 from the inside of the room, the upper end of the interior wall panel 30 can be accurately positioned and fixed by the horizontal support 122. At this time, by attaching the upper end of the interior wall panel 30 to the horizontal support 122 from the inside of the room almost perpendicularly with the fastening fixture S3, the attachment position relative to the upper end of the interior wall panel 30 can be adjusted from the inside of the room by the screwing amount of the fastening fixture S3. Also, by forming the upper end of the interior wall panel 30 at the same height as the upper end of the frame 32 and the gypsum board 31, the frame 32 prevents damage to the gypsum board 31, and the interior wall panel 30 becomes easy to transport and install.

[0220] The edge member 135 may be attached to the lower end of the interior wall panel 30. The edge member 135 can be easily attached with high precision to the lower end of the interior wall panel 30. Moreover, it is easier to position the edge member 135 than to attach the horizontal support member 122 to the upper surface of the floor surface material 16.

[0221] The lower end of the interior wall panel 30 may be supported from the outside of the room by the end of the floor surface material 16 (installed on the beam (floor joist 14)) via the edge member 135. By moving the interior wall panel 30 from the outside to the inside of the room and abutting the edge member 135 of the lower end against the end of the floor surface material 16, the lower end of the interior wall panel 30 can be positioned with high precision and fixed to the beam (floor joist 14). The positioning of the lower end of the interior wall panel 30 is performed by the position of the end of the floor surface material 16. When attaching the floor surface material 16 to the floor joist 14, a jig is used to accurately position the end.

[0222] Attaching the edge member 135 to the lower end of the interior wall panel 30 makes the work of attaching the member easier than attaching the horizontal support member 122 that protrudes upward from the upper surface of the floor material 16 or the cushioning material 33. Furthermore, by installing the edge member 135 at the lower end of the interior wall panel 30, it is no longer necessary to attach the horizontal support members 21, 121 to the upper surface of the floor material 16 or to attach the cushioning material 33 to the lower end of the gypsum board 31, and therefore costs can be reduced accordingly.

[0223] The lower end of the interior wall panel 30 is formed at the same height as the lower end of the frame 32 and the gypsum board 31, and an edge member 135 is attached, so that the frame 32 and the edge member 135 protect the lower end of the interior wall panel 30. Thus, the frame 32 and the edge member 135 prevent damage to the lower end of the gypsum board 31, making it easier to transport and install the interior wall panel 30.

[0224] With the edge member 135 at the lower end of the interior wall panel 30 abutting against the end of the floor surface material 16 from the outside to the inside of the room, the edge member 135 is attached downward to the beam (floor joist 14) with fastening fixtures S8. This allows the lower end of the interior wall panel 30 to be attached while visually checking the position from the inside of the room. In addition, since the attachment is from a different direction than the upper end and side edges of the interior wall panel 30, the interior wall panel 30 can be installed in a well-balanced manner as a whole and attached with high precision.

[0225] The lateral extension 136 may be a member that extends continuously in the height direction of (one of) the interior wall panels 30. As a result, the side edge of the interior wall panel 30 is supported (backed) continuously in the height direction (up and down direction) from the outside of the room by the lateral extension 136. Then, almost the entire side edge of the interior wall panel 30 is reinforced by the lateral extension 136, and almost the entire side edge of the interior wall panel 30 has a stable shape. At the same time, the rigidity of the lateral extension 136 is also increased.

[0226] Furthermore, by abutting the side edge of the other interior wall panel 30 against the lateral extension 136 from the inside of the room, the lateral extension 136 receives almost the entire side edge of the other interior wall panel 30 continuously in the height direction from the outside of the room. As a result, almost the entire side edge of the other interior wall panel 30 is positioned almost perpendicular to the surface by the lateral extension 136. Therefore, the side edge of the other interior wall panel 30 can be attached to the lateral extension 136 with high precision.

[0227] Furthermore, by making the lateral extension portion 136 a component that extends continuously in the height direction of the interior wall panel 30, the side edge portion of the other interior wall panel 30 can be fixed to the lateral extension portion 136 from the inside of the room at any position in the height direction using fastening fixture S5, almost perpendicular to the surface.

[0228] Then, the fixing position of the fastening fixture S5 relative to the side edge of the other interior wall panel 30 is optimally selected according to the on-site conditions, and the screw-in amount at each fixing position is optimally adjusted. This allows the step adjustment of the joint between the side edges of the adjacent interior wall panels 30 to be performed from the inside of the room. In other words, the height adjustment of the joint between the vertically long horizontal protrusion 136 and the interior wall panel 30 can be freely performed.

[0229] Moreover, the vertically long horizontal extension portion 136 provides more positions at which the step can be adjusted than when multiple horizontal extension portions 36 (divided horizontal extension portions) are provided at several points spaced apart in the height direction, and the step can be freely adjusted at any position other than the fixed position, making it possible to make finer step adjustments.

[0230] In the manufacture of the interior wall panel 30, screwing takes about 5 seconds per location, whereas nailing takes about 1 second per location, so the manufacturing time of the interior wall panel 30 can be shortened accordingly, and the manufacturing efficiency of the interior wall panel 30 can be significantly improved. Moreover, by automating the assembly of the interior wall panel 30, even if screwing is changed to nailing, the variation in the assembly accuracy of the interior wall panel 30 can be suppressed, so that the interior wall panel 30 with relatively high accuracy can be obtained in a short time and at low cost. However, as described above, with nailing, it is not possible to adjust the step by changing the amount of screwing in the interior wall panel 30, so nailing has not been used in the manufacture of the interior wall panel 30 so far.

[0231] In this embodiment, as described above, by providing the lateral projection 136 that is continuous in the height direction, it is possible to adjust the step between the side edges of the adjacent interior wall panels 30 at any position in the height direction between the lateral projection 136 and the interior wall panel 30. In this way, by providing a new step adjustment means between the interior wall panel 30 and the lateral projection 136, the interior wall panel 30 does not require step adjustment between the gypsum board 31 and the frame 32. Therefore, there is no problem even if the interior wall panel 30 is changed to one in which the gypsum board 31 is nailed to the frame 32 instead of being screwed. Therefore, the manufacturing efficiency of the interior wall panel 30 is improved accordingly.

[0232] Even when the lateral projection 136 that continues in the height direction is provided, the vertical alignment adjustment of the step at the joint between adjacent interior wall panels 30 only needs to be performed for the necessary portion between the interior wall panel 30 and the lateral projection 136, so the adjustment man-hours do not increase more than necessary. Therefore, the alignment adjustment in the height direction for the step can be efficiently performed, and wallpaper can be applied without any step between adjacent interior wall panels 30. The lateral projection 136 that continues in the height direction can be used in each of the above-mentioned embodiments to obtain the same effect.

[0233] In addition, a horizontal support member 122 is attached to the top of the building unit 10, and an edge member 135 and a horizontal protrusion 136 are attached to the lower end and side edge of the interior wall panel 30. This makes it possible to improve the assembly accuracy and manufacturing efficiency of the interior wall as a whole without increasing the number of materials used to install the interior wall panel 30. Also, it is possible to more effectively prevent the occurrence of steps at the joints between the side edges of adjacent interior wall panels 30. Furthermore, even if an exterior wall is attached to the building unit 10, the interior wall panel 30 can be attached without being hindered by the exterior wall.

[0234] The interior wall panel 30 may be fixed to the building unit 10 at one position in the middle of the height direction of the side edge. This reduces the portion of the side edge of the interior wall panel 30 that is directly fixed to the building unit 10 and ensures the minimum number of fixing points. This reduces the effect of the exterior wall attached to the building unit 10.

[0235] The side edge of the interior wall panel 30 is fixed to the building unit 10 by fastening fixtures S9 via building fixing parts 43 attached to the studs 18. Since an exterior wall is attached to the studs 18, if there are many fixing points of the side edge of the interior wall panel 30 to the building unit 10 (of the building fixing parts 43), the interior wall panel 30 becomes more susceptible to influence from the exterior wall. Therefore, by limiting the fixing point of the side edge of the interior wall panel 30 to the building unit 10 to one point, it is possible to minimize the influence from the exterior wall.

[0236] Conversely, if there is no portion at all to fasten the side edge of the interior wall panel 30 to the building unit 10, the interior wall panel 30 will easily bulge toward the interior side of the room. If the interior wall panel 30 bulges toward the interior side of the room, it will be difficult to straighten the side edge of the interior wall panel 30 over the entire vertical range and to make adjustments (alignment adjustments) to eliminate steps at the joints of the side edges of adjacent interior wall panels 30.

[0237] Therefore, by providing only one fixing point of the interior wall panel 30 to the building unit 10 at the middle part in the height direction of the side edge of the interior wall panel 30, it is possible to effectively correct the bulge of the interior wall panel 30. Then, by correcting the bulge of the interior wall panel 30, it becomes easier to adjust the alignment of the side edge of the interior wall panel 30, reducing the number of steps and reducing costs.

[0238] Furthermore, the fixing point to the building unit 10 (to the building fixing part 43) is one point in the height direction of the side edge of the interior wall panel 30. This reduces the number of points between the building fixing part 43 and the lateral extension part 136 where the insulation material 41 is likely to get pinched, and reduces the work required to remove the pinched insulation material 41. Other configurations and effects are substantially the same as those of the above embodiment, so explanations will be omitted.

[0239] The inner wall installation method and inner wall installation structure of the present disclosure have been described above based on Examples 1 to 4. However, the specific configurations are not limited to these Examples, and design changes and combinations of the Examples are permitted as long as they do not deviate from the gist of the invention according to the claims of the present invention.

[0240] (Another embodiment of the inner wall connecting process) In the first embodiment, a plurality of lateral projections 36 made of a separate member from the inner wall panels 30 are attached to the frame 32 for widthwise connection between the inner wall panels 30. In the fourth embodiment, a lateral projection 136 made of a separate member from the inner wall panels 30 is attached to the frame 32 as a member that extends continuously in the height direction. However, as shown in FIG. 17, in two adjacent inner wall panels 30, one of the inner wall panels 30 may have a left vertical frame 132c formed with an L-shaped cross section to form a lateral projection 236 that projects to the side. The lateral projection 236 is an auxiliary mounting part integrated with the inner wall panel 30. In this case, the other inner wall panel 30 may have a right vertical frame 132d cut out with an L-shaped cross section to form a cutout portion that receives the lateral projection 236. As a result, the lateral projection 236 (and the cutout) becomes integral with the interior wall panel 30 and extends continuously over the entire height direction of the interior wall panel 30. In this case, the manufacture of the interior wall panel 30 itself becomes the auxiliary portion forming process.

[0241] Then, after one of the interior wall panels 30 is attached to the side surface of the building unit 10, the other interior wall panel 30 is installed next to the first interior wall panel 30. At this time, the horizontal extension 236 provided on the left vertical frame 132c of one of the interior wall panels 30 is matched with the cutout provided on the right vertical frame 132d of the other interior wall panel 30. In this state, the fastening fixture S5 is attached to the other interior wall panel 30 almost perpendicularly from the inside to the outside of the room, penetrating the gypsum board 31 and the right vertical frame 132d and entering the inside of the horizontal extension 236 by a predetermined amount or more. As a result, the one interior wall panel 30 and the other interior wall panel 30 are connected in the width direction.

[0242] (Another embodiment of the inner wall connecting process) 18, in two adjacent interior wall panels 30, the left vertical frame 32c of one interior wall panel 30 and the right vertical frame 32d of the other interior wall panel 30 may be provided so as to be shifted inward from the peripheral portion of the gypsum board 31. In this case, the width dimension of the frame 32 of the interior wall panel 30 is formed smaller than the width dimension of the gypsum board 31. As a result, a step edge portion 31b protruding laterally from the left vertical frame 32c is formed at the edge portion of the gypsum board 31 of one interior wall panel 30. Similarly, a step edge portion 31b protruding laterally from the right vertical frame 32d is formed at the edge portion of the gypsum board 31 of the other interior wall panel 30.

[0243] A horizontal extension 336 made of a separate member from the left vertical frame 32c may be attached to the exterior side surface of the step edge 31b of the edge of the gypsum board 31 of one of the interior wall panels 30 (and the outer surface of the left vertical frame 32c). The horizontal extension 336 is an auxiliary attachment part attached to the interior wall panel 30. The horizontal extension 336 is formed to a size that protrudes laterally from the gypsum board 31 by the step edge 31b of the other interior wall panel 30. The horizontal extension 336 may be a small piece provided with a plurality of intervals in the vertical direction, or may extend continuously over the entire height of the interior wall panel 30, similar to the horizontal extensions 136 and 236. The horizontal extension 336 is attached to the left vertical frame 32c of one of the interior wall panels 30 almost horizontally from the outer surface side to the inner surface side by the fastening fixture S4. The lateral extension 336 is attached from the indoor side to the gypsum board 31 (the outdoor side surface of the step edge 31b) approximately perpendicularly by a fastening fixture S4. The auxiliary part forming process for attaching the lateral extension 336 to the frame 32 is performed when the interior wall panel 30 is manufactured (in the interior wall panel manufacturing process).

[0244] In this case, in the interior wall connecting step, after one interior wall panel 30 is attached to the building unit 10, the other interior wall panel 30 is installed next to the one interior wall panel 30. At this time, the step edge portion 31b of the other interior wall panel 30 is abutted against the horizontal protrusion portion 336 attached to the left vertical frame 32c of one interior wall panel 30. Then, the other interior wall panel 30 is attached to the horizontal protrusion portion 336 attached to the one interior wall panel 30 by the fastening fixture S5, thereby connecting the one interior wall panel 30 and the other interior wall panel 30. Specifically, the fastening fixture S5 is attached to the outdoor surface of the step edge portion 31b of the other interior wall panel 30 from the indoor side toward the outdoor side, almost perpendicular to the surface. Then, the fastening fixture S5 penetrates the gypsum board 31 and enters the interior of the lateral projection portion 336 by a predetermined amount or more, thereby connecting one interior wall panel 30 and the other interior wall panel 30 in the width direction.

[0245] (Yet another embodiment of the inner wall connecting process) As shown in FIG. 19, for two adjacent interior wall panels 30, the gypsum board 31 is attached with its side edge shifted inward relative to the frame 32 so that the left vertical frame 32c of one interior wall panel 30 and the right vertical frame 32d of the other interior wall panel 30 are partially exposed (or overhang) to the indoor side. This exposed portion of the frame 32 functions as an attachment auxiliary portion similar to the above-mentioned horizontal overhang portion 136. The width dimension of the frame 32 of the interior wall panel 30 is formed larger than the width dimension of the gypsum board 31 by the amount of overhang or exposure of the side edge. As a result, the exposed portion of the frame 32 is formed continuously over the entire height direction of the interior wall panel 30. In this case, the manufacture of the interior wall panel 30 itself becomes the auxiliary portion forming process.

[0246] Then, after one of the interior wall panels 30 is attached to the building unit 10, the other interior wall panel 30 is installed next to the first interior wall panel 30, and the exposed portions (lateral projections) are butted together horizontally. Next, extension members 37 are installed so as to straddle the portions (lateral projections) exposed from the side edges of the gypsum boards 31 of the frame 32, and the extension members 37 may be attached perpendicularly to the surfaces of the exposed portions of the frame 32 from the interior side with fastening fixtures S5 such as screws or bolts. The extension members 37 are vertically elongated members having the same width as the combined spacing of the exposed portions, the same thickness as the gypsum boards 31, and the same length as the height of the interior wall panels 30. As a result, two adjacent interior wall panels 30 (their horizontal protruding portions) are connected in the width direction via the extension material 37, and the step in the gypsum board 31 between two adjacent interior wall panels 30 can be made less noticeable by filling it from the inside of the room with the extension material 37. In this case, the side edges of the gypsum board 31 between the two interior wall panels 30 are not directly butted together, but are separated by the extension material 37, and two joints are formed between both side edges of the extension material 37.

[0247] (Yet another embodiment of the inner wall connecting process) 20 to 26 are diagrams for explaining still another embodiment of the inner wall connecting step, etc. The structure of this embodiment can be similarly applied to all other embodiments.

[0248] That is, as shown in Figure 20, the fastening fixture S51, which overlaps the side edge of an adjacent interior wall panel 30 with the indoor side of a lateral extension portion 36 (including lateral extension portions 136, 236, 336; hereinafter referred to simply as lateral extension portion 36) attached to the side edge portion of an interior wall panel 30 and fastens from the indoor side, may have threaded portions 502, 503 at the tip and base ends of a body portion 501, and may also have a straight portion 504 between the threaded portions 502, 503 at the tip and base ends. In this case, the threaded portion 502 on the tip side is formed on the tip side of a position separated from the base end of the body portion 501 by a distance 505 equivalent to the thickness of the entire inner wall panel 30. Further, the screw portion 503 on the base end side is formed in a range from the base end of the body portion 501 to a position exceeding a distance 506 corresponding to the thickness of the gypsum board 31 constituting the interior wall panel 30 . The intermediate straight portion 504 is formed in a range from a position that is a distance 506 greater than the thickness of the gypsum board 31 from the base end of the body portion 501 to a position that is a distance 505 greater than the thickness of the frame 32 that constitutes the interior wall panel 30.

[0249] Here, the fastening fixture S51 has a length that is at least more than half the thickness of the lateral projection 36 from the surface of the interior wall panel 30. Preferably, the fastening fixture S51 has a length that is at least enough to reach the rear surface side of the lateral projection 36. The base end of the body 501 is the head 507 of the fastening fixture S51. The threaded portion 502 on the tip side may start slightly before the position of distance 505 from the base end. The threaded portion 503 on the base end side is formed so as to extend at least 2 to 3 turns beyond the position of distance 506 from the base end.

[0250] As a result, the fastening fastener S51 becomes a special screw, and as shown in Figure 21, when the fastening fastener S51 is screwed in from the inside of the room to the correct depth (a position where the head 507 of the fastening fastener S51 is flush with the surface of the plasterboard 31), the screw portion 502 at the tip is screwed into the lateral protrusion 36, the straight portion 504 in the middle penetrates into the frame 32 of the interior wall panel 30, and the screw portion 503 at the base end is screwed into a part of the front side of the plasterboard 31 and frame 32 of the interior wall panel 30.

[0251] Therefore, even if the lateral extension 36 is temporarily separated from the interior wall panel 30 by being pushed by the fastening fixture S51 and deformed toward the outdoor side when the fastening fixture S51 is screwed in, the straight portion 504 rotates freely within the frame 32 and does not advance while the threaded portion 502 at the tip end is screwed into the lateral extension 36, so that the lateral extension 36 is finally returned to a state in close contact with the interior wall panel 30, thereby preventing a gap from being generated between the lateral extension 36 and the side edge of the adjacent interior wall panel 30, which causes a difference in surface level between the interior wall panels 30. Therefore, it is no longer necessary to use a material that is difficult to deform, such as metal or hard resin, for the lateral extension 36 in order to prevent the occurrence of a difference in surface level, and wood, particularly plywood with a small volume, which is relatively inexpensive and strong, can be used.

[0252] In contrast, for example, when a general JIS standard screw is used for the fastening fixture S5, the fastening fixture S5 has a continuous threaded portion over the entire length of the body, which causes the following problems. That is, as shown in Fig. 22(a), when the fastening fixture S5 is screwed in, the lateral extension 36 is pushed and deformed toward the outside by the fastening fixture S5, and if the lateral extension 36 separates from the interior wall panel 30, the middle part of the threaded portion continues to advance inside the frame 32 while the tip of the threaded portion is being screwed into the lateral extension 36. Then, the lateral extension 36 remains separated from the interior wall panel 30 without being corrected, so that a gap 508 remains between the lateral extension 36 and the side edge (right vertical frame 32d) of the adjacent interior wall panel 30, and finally, as shown in Fig. 22(b), the deformation of the lateral extension 36 returns to its original state, which may cause a surface step 509 between the adjacent interior wall panels 30. Therefore, by using the fastening fixture S51 having the straight portion 504 in the middle, the occurrence of such surface step 509 between the interior wall panels 30 can be reliably prevented.

[0253] In addition, the screw portion 502 at the tip end is screwed into the lateral projection 36 or penetrates the lateral projection 36, so that the fastening fixture S51 is stronger against a pull-out force in the direction perpendicular to the surface (the pull-out resistance is greater) than when it is simply nailed. At the same time, the whole or part of the straight portion 504 is in surface contact with the entire circumference of the frame 32, so that the fastening fixture S51 is stronger against a shear force in the direction perpendicular to the surface (the shear resistance is greater) than when the threaded portion is in line contact with the frame 32 as with a general JIS standard screw, so that the advantages of both nailing and screwing can be obtained at the same time. Therefore, by using the fastening fixture S51 having the straight portion 504 in the middle, the resistance in both the direction perpendicular to the surface and the direction perpendicular to the surface can be secured. Therefore, the wallpaper can be prevented from becoming wrinkled or torn.

[0254] Furthermore, by providing a screw portion 503 on the base end side of the fastening fixture S51, even after adjacent interior wall panels 30 have been fastened to the lateral projection portion 36 with the fastening fixture S51, a portion of the screw portion 503 on the base end side is screwed into the frame 32, so that the fastening fixture S51 can be pulled back slightly by rotating it in the reverse direction, making it possible to adjust the surface step 509 between the interior wall panels 30 even after the fact.

[0255] In contrast, as shown in Fig. 24(a), for example, a fastening fixture S52 having two parts, a threaded part 502 at the tip end and a straight part 504a extending to the base end, and no threaded part 503 at the base end can be used. However, in this case, as with the fastening fixture S51 described above, the function of preventing the surface step 509 between the interior wall panels 30 and the function of ensuring strength in both the surface direction and the direction perpendicular to the surface can be obtained, but, for example, as shown in Fig. 24(b), if the fastening fixture S51 is driven too deeply into the interior wall panel 30 (into the gypsum board 31) and the threaded part 502 at the tip end completely penetrates the lateral extension part 36, etc., only the straight part 504 enters the lateral extension part 36 and the interior wall panel 30, and the threaded part 502 is no longer caught by either the lateral extension part 36 or the interior wall panel 30, so that the fastening fixture S52 cannot be advanced or retracted. For this reason, the fastening fixture S52 needs to be fastened carefully, and it becomes impossible to adjust the surface step 509 between the interior wall panels 30 later. Therefore, by using a fastening fixture S51 having a screw portion 503 on the base end side of the straight portion 504 as shown in Fig. 25, even if the fastening fixture S52 is driven too deeply, it can be returned by the screw portion 503 on the base end side, or the screw portion 502 on the tip end side can be returned so as to be caught again, which makes the fastening work easier and makes it possible to adjust the surface step 509 between the interior wall panels 30 later, improving workability and making it more preferable.

[0256] It should be noted that the above-mentioned special screw having a straight portion 504 between the tip-end and base-end screw portions 502, 503 similar to the fastening fixture S51 can also be used for other parts. For example, by using a special screw having a straight portion 504 between the tip-end and base-end screw portions 502, 503 similar to the fastening fixture S51 as the fastening fixture S3 for fixing the upper and lower portions of the interior wall panel 30 shown in Figs. 4 and 6 to the horizontal support member 21 (horizontal support member 22, 121, 122, 222, etc.) as shown in Fig. 26, the same effect as above can be obtained.

[0257] The configurations of the above-mentioned embodiments can be used in appropriate combination. For example, in the first and second embodiments, the upper part of the interior wall panel 30 is attached to the building unit 10. However, these structures can be applied to the structure in which the lower part of the interior wall panel 30 is attached to the building unit 10.

[0258] In the first and second embodiments, a mounting structure for mounting the upper part of the interior wall panel 30 to the building unit 10 is shown, and in the third embodiment, a mounting structure for mounting the lower part of the interior wall panel 30 to the building unit 10 is shown. However, these structures can be applied to the mounting structure for the upper part of the interior wall panel 30 and the mounting structure for the lower part of the interior wall panel 30, and can further be applied in combination.

[0259] In the first to third embodiments, the horizontal support members 22, 122, 222, etc. are provided on the outdoor side of the interior wall panel 30. However, the horizontal support members 22, 122, 222 can also be provided on the indoor side of the interior wall panel 30.

[0260] In the first to third embodiments, the interior wall panel 30 is attached to the building unit 10 by fastening fixtures S3, S5, S8 such as screws. However, the interior wall panel 30 can also be attached to the building unit 10 by adhesive or the like. [Explanation of symbols]

[0261] 1 unit building 10 Building Units 11 Pillars 13 Ceiling beam (example of beam) 14 Floor beam (example of beam) 16 Floor material 17 Ceiling surface materials 21 Horizontal support (attachment auxiliary part) 22 Horizontal support (attachment auxiliary part) 30 Interior wall panels 31 Gypsum board 31a Protrusion 32 Frames 32a Upper horizontal frame 32b Upper horizontal frame 32c Left vertical frame 32d Right vertical frame 33 Cushioning material 35 Edge member (attachment auxiliary part) 36 Horizontal extension part (attachment auxiliary part) 43 Building fixed part 121 Horizontal support (attachment auxiliary part) 122 Horizontal support (attachment auxiliary part) 135 Edge member (attachment auxiliary part) 136 Horizontal extension part (attachment auxiliary part) 222 Horizontal support (attachment auxiliary part) 236 Horizontal extension part (attachment auxiliary part) 336 Horizontal extension part (attachment auxiliary part) 501 Torso 502 Screw part 503 Threaded part 504 Straight section 505 distance 506 distance 507 Head

Claims

1. An interior wall installation structure in which an interior wall panel is installed adjacent to an interior side of an exterior wall attached to a building unit, A lateral protrusion protruding in a width direction toward the adjacent inner wall panel is attached to a side edge of the inner wall panel that is integrated by attaching a gypsum board to a frame, The lateral projection extends continuously in the height direction of the interior wall panel. An inner wall installation structure.

2. A building fixing part is attached to the building unit to fix one position of the intermediate part of the lateral extension part in the height direction. The inner wall installation structure according to claim 1 .

3. The fastening fixture, which is fastened from the indoor side by overlapping the side edge of the adjacent interior wall panel with the indoor side of the lateral projection portion attached to the side edge portion of the interior wall panel, has threaded portions at the tip and base ends of a body portion and has a straight portion between the threaded portions at the tip and base ends, The threaded portion on the tip side is formed on the tip side of a position separated from the base end of the body portion by a distance corresponding to the thickness of the entire inner wall panel, The screw portion on the base end side is formed in a range from the base end of the body to a position exceeding a distance corresponding to the thickness of the gypsum board constituting the interior wall panel, The intermediate straight portion is formed in a range from a position that is beyond the distance of the thickness of the gypsum board from the base end of the body portion to a position that is away from the distance of the thickness of the frame that constitutes the inner wall panel. The inner wall installation structure according to claim 1 or 2, characterized in that

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