Floor structure of building unit

Abstract

To achieve a structure where a corner floor plate can be easily and reliably fixed at a corner part of a floor part.SOLUTION: A floor structure of a building unit 1 includes: a floor plate 11 installed at a portion excluding a corner part 12 of a rectangular floor part 6 of the building unit 1; and a corner floor plate 14 installed at the corner part 12 of the floor part 6. The corner floor plate 14 includes a reinforcing wooden crosspiece 21 fixed to the floor plate 11 on a lower surface 14e. The reinforcing wooden crosspiece 21 is installed at the corner floor plate 14 so as to be movable toward the floor plate 11 so that it becomes the state where a part 21a protrudes to the outside of the corner floor plate 14 from the state where the whole is hidden inside the corner floor plate 14.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to floor construction of a building unit. [Background technology]

[0002] A modular building is a building that can be constructed in a short period of time by transporting building units manufactured in a factory to a construction site and assembling them there (see, for example, Patent Document 1).

[0003] The building unit has a floor section that is approximately rectangular in plan view, and floor panels are installed on the floor section at the factory. The floor section has openings for work at its corners. The openings are not blocked in the factory, but are manually blocked with corner panels by workers after the necessary work is completed at the construction site. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-193263 A Summary of the Invention [Problem to be solved by the invention]

[0005] When closing an opening formed in a corner of a floor section with a corner floor panel at a construction site, it is necessary to fix the corner floor panel to the corner. However, the structure of the corner section makes it difficult to fix the corner floor panel.

[0006] Therefore, a main object of the present invention is to contribute to improving the above-mentioned problems. [Means for solving the problem]

[0007] In response to the above problems, the present invention provides: A floor plate is installed in a portion of the rectangular floor portion of the building unit excluding the corner portions; A corner floor plate installed at the corner portion of the floor section; A floor structure of a building unit comprising: The corner floor board has a reinforcing wooden beam on the underside thereof for fixing to the floor board, The floor structure of the building unit is characterized in that the reinforcing wooden battens are installed on the corner floor boards so that they can move toward the floor boards from a state in which they are entirely hidden inside the corner floor boards to a state in which a part of them protrudes outside the corner floor boards. Effect of the Invention

[0008] With the above-described configuration, the present invention provides a structure that can easily and reliably fix a corner floor panel to a corner portion of a floor section. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a building unit to which the floor structure of this embodiment is applied. [Diagram 2] FIG. 2 is a partial plan view of a floor of a building unit. [Diagram 3] FIG. 2 is an exploded perspective view showing the attachment state of a corner floor panel to an opening provided in a corner portion of a floor section. [Figure 4] FIG. 13 is a perspective view of a stack of lower floor building units and upper floor building units. [Diagram 5] This is a part drawing of a corner floor panel. (a) is a plan view, and (b) is a side view. [Figure 6] FIG. 4 is a plan view showing the state of movement of the reinforcing wooden beam relative to the corner floor board. [Figure 7] FIG. 4 is a partially enlarged plan view showing the state in which the corner floor panel is attached to the corner portion. [Figure 8] 8 is a partially enlarged vertical cross-sectional view of the floor portion at the position of the floor board receiving material in FIG. 7. [Figure 9] 1A is a partially enlarged cross-sectional view of a corner of the floor section, showing the state in which the wall support rail and inner wall panel have been installed, and FIG. 1B is a partially enlarged vertical cross-sectional view of the position of the floor board support material in (a). [Figure 10] 9(a) is a partially enlarged horizontal cross-sectional view similar to FIG. 9(a) according to a comparative example, and FIG. 9(b) is a partially enlarged vertical cross-sectional view of the position of the floor board support material in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] This embodiment will be described in detail with reference to FIGS. EXAMPLES

[0011] <Configuration> The configuration of this embodiment is as follows.

[0012] Buildings such as detached houses and apartment buildings are constructed from unit buildings. As shown in Figure 1, a unit building is a building in which building units 1 manufactured in a factory are transported to the construction site and assembled there, so that it can be constructed in a short period of time.

[0013] The building unit 1 has a box-frame rigid-frame unit frame 5 as its skeletal part, which is formed by connecting the upper ends of four metal columns 2 extending in the vertical direction Z in a rectangular shape with four horizontal metal ceiling beams 3 and connecting the lower ends of the four columns 2 in a rectangular shape with four horizontal metal floor beams 4.

[0014] As shown in FIG. 2, the building unit 1 has, at its lower part, a floor section 6 that is substantially rectangular in plan view. The floor section 6 is formed horizontally on a floor frame 7 that is composed of four floor beams 4. A plurality of floor joists 8 are installed inside the floor frame 7. The floor joists 8 extend in the short side direction X of the floor section 6 and are installed parallel to each other with a gap in the long side direction Y. The floor joists 8 are installed between a pair of floor beams 4 that form the long sides of the floor section 6.

[0015] A floor panel 11 is installed in a factory on the floor frame 7 and floor joists 8 that define the floor section 6. A work opening 13 is formed at a corner section 12 of the floor section 6, as shown in Fig. 3. After necessary work is completed at the construction site, the opening 13 is manually closed with a corner floor panel 14 by a worker.

[0016] The floorboards 11 are large surface materials that are installed singly or in multiples side-by-side on the floor frame 7 and floor joists 8 so as to cover almost the entire surface of the floor section 6 except for the openings 13 .

[0017] The corner sections 12 are the four corners of the rectangular floor section 6, and are formed around the portions where the ends of the floor beams 4 connect to the columns 2. Joint pieces 15 are used to connect the ends of the floor beams 4 to the columns 2.

[0018] The opening 13 is an open space formed by not installing floor panels 11 locally at a corner portion 12 in a factory. The opening 13 is formed, for example, in the floor portion 6 of the building unit 1 on a lower or upper floor as necessary. The opening 13 may have any shape, but in this embodiment, it is approximately rectangular in plan view.

[0019] The openings 13 are used for, for example, positioning the building units 1 horizontally, and connecting the building units 1 of the upper floor H and the lower floor L as shown in Fig. 4. The upper and lower building units 1 are fastened in the vertical direction Z by fasteners 16 such as bolts and nuts between the joint pieces 15.

[0020] The corner floor board 14 is a relatively small surface material that is installed in the opening 13 to close the opening 13. The corner floor board 14 has approximately the same shape and size as the opening 13. In this embodiment, the corner floor board 14 is a rectangular board that approximately matches the rectangular opening 13, as shown in FIG. 5. The rectangular corner floor board 14 has first to fourth sides 14a to 14d. The corner floor board 14 may be formed, for example, from a hard wood chip cement board.

[0021] The floor structure of the building unit 1 comprises floor panels 11 installed in the rectangular floor section 6 of the building unit 1 excluding the corner sections 12, and rectangular corner floor panels 14 installed in the corner sections 12 (the sections without the floor panels 11) of the floor section 6. In addition to the floor structure of the building unit 1 as described above, this embodiment may also have the following configuration.

[0022] (1) As shown in FIG. 5, the corner floor board 14 has a reinforcing wooden crosspiece 21 on the lower surface 14e for fixing to the floor board 11. As shown in Figure 6, the reinforcing wooden beam 21 is installed on the corner floor board 14 so that it can move toward the floor board 11 from a dashed line state in which it is completely hidden inside the corner floor board 14 to a virtual line state in which a portion 21a protrudes outside the corner floor board 14.

[0023] Here, the lower surface 14e is the downward facing surface of the main body of the corner floor board 14 installed horizontally on the floor part 6. In contrast, the upward facing surface of the main body of the corner floor board 14 installed horizontally on the floor part 6 is the upper surface 14f.

[0024] The reinforcing wooden crosspiece 21 is a wooden crosspiece (a long, thin piece of square timber) that reinforces the corner floor board 14 and the component to which the corner floor board 14 is attached (the component, floor board 11 in this embodiment). The reinforcing wooden crosspiece 21 is installed so that it can move relative to the corner floor board 14. One or more reinforcing wooden crosspieces 21 can be attached to the corner floor board 14. In this embodiment, one reinforcing wooden crosspiece 21 is used.

[0025] "Entirely hidden" refers to all parts of the reinforcing wooden crosspiece 21. "Entirely hidden" refers to a state in which the reinforcing wooden crosspiece 21 is not visible when the horizontally installed corner floor board 14 is viewed from directly above.

[0026] The portion 21a is a localized portion of the reinforcing wooden crosspiece 21. When the horizontally installed corner floor board 14 is viewed from directly above, the protruding portion 21a is in a state in which the reinforcing wooden crosspiece 21 appears to protrude locally from the corner floor board 14. The portion 21a protruding from the corner floor board 14 serves as an attachment allowance for the mating member. The reinforcing wooden crosspiece 21 protrudes toward the mating member (floor board 11). The remaining portion (other portion 21b) that does not protrude from the corner floor board 14 serves as an attachment allowance for the corner floor board 14.

[0027] The movement is a change in the relative position of the reinforcing wooden crosspiece 21 with respect to the corner floor board 14, and may be a translational movement or a rotational movement. The reinforcing wooden crosspiece 21 is moved along the lower surface 14e of the corner floor board 14.

[0028] (2) In the above, as shown in Figure 7, based on the state in which the corner floor board 14 is installed at the corner portion 12, the reinforcing wooden crosspiece 21 may be supported by a pivot shaft 31 so as to rotate from a perpendicular state to the edges 14a, 14b of the corner floor board 14 adjacent to the floor board 11 to a parallel state in which a portion 21a of the width protrudes outside the corner floor board 14.

[0029] Here, the sides 14a, 14b adjacent to the floorboard 11 are the sides 14a, 14b among the four sides 14a to 14d of the rectangular corner floorboard 14 that are substantially butted against the floorboard 11. The sides 14a, 14b of the corner floorboard 14 are in line contact with the floorboard 11 or face each other with a small gap. The reinforcing wooden crosspiece 21 may be installed on either one or both of the sides 14a, 14b, but in this embodiment, only the side 14a is used. Below, an example in which the reinforcing wooden crosspiece 21 is installed on only the side 14a will be described.

[0030] The vertical state is a state in which the reinforcing wooden crosspiece 21 is arranged at a right angle to the side 14a of the corner floor board 14 and is completely hidden inside the corner floor board 14. It is sufficient that one end of the reinforcing wooden crosspiece 21 is inside the side 14a of the corner floor board 14, but it is also possible to align one end with the side 14a of the corner floor board 14.

[0031] The width portion 21a is a portion that becomes one side in the width direction of the reinforcing wooden crosspiece 21. By rotating the reinforcing wooden crosspiece 21 to a state parallel to the side 14a, the width portion 21a becomes a portion of approximately uniform width that extends continuously in the longitudinal direction of the reinforcing wooden crosspiece 21. As described above, the portion 21a of the reinforcing wooden crosspiece 21 that is parallel to the side 14a and protrudes from the corner floor board 14 becomes an attachment allowance for the floor board 11, and the remaining portion (other portion 21b) hidden by the corner floor board 14 ultimately becomes an attachment allowance for the corner floor board 14. Therefore, the portion 21a and the other portion 21b are formed to have a width (approximately 1 / 3 to 2 / 3 of the total width of the reinforcing wooden crosspiece 21) and a length that are at least as large as an attachment allowance.

[0032] The parallel state is a state in which the width center line of the reinforcing wooden crosspiece 21 is approximately parallel to the side 14a of the corner floor board 14. At this time, the boundary line between the part 21a and the other part 21b is also parallel to the width center line of the reinforcing wooden crosspiece 21 and the side 14a of the corner floor board 14.

[0033] The pivot shaft 31 can be a screw or bolt that is approximately perpendicular to the corner floor board 14. The pivot shaft 31 becomes rotatable by fixing the reinforcing wooden crosspiece 21 to the corner floor board 14 at one point. The pivot shaft 31 enables the reinforcing wooden crosspiece 21 to move with the simplest configuration.

[0034] In addition, the reinforcing wooden crosspiece 21 can move in parallel or by sliding it by providing a long hole in the corner floor board 14 and fixing it to the corner floor board 14 with an axial member such as a screw or bolt through the long hole. The long hole can be, for example, linear, arc-shaped, folded line-shaped, or free curve-shaped.

[0035] (3) In the above, the floor board 11 has an L-shaped cutout 41 at the corner portion 12 to accommodate the corner floor board 14, and the corner floor board 14 may be installed in the L-shaped cutout 41 so that its two sides 14a, 14b are adjacent to the floor board 11. A floor joist 8 may be provided below one side 14b of the corner floor board 14 adjacent to the floor board 11 and the cutout portion 41. A floor board support 43 for supporting the floor board 11 may be provided under the end of the other side 14a of the corner floor board 14 adjacent to the floor board 11 and the cutout portion 41 opposite the floor joist 8. The other side 14a of the corner floor board 14 may be bridged between the floor beam 8 and the floor board support material 43. The reinforcing wooden crosspiece 21 may be moved so as to be parallel to the other side 14a during installation, and installed in the middle of the other side 14a.

[0036] Here, the cutout 41 is a missing portion formed at the position of the corner of the floorboard 11. The cutout 41 is approximately the same size and shape (rectangular) as the corner floorboard 14 so that the corner floorboard 14 fits in. The L-shaped cutout 41 has two cutout sides 41a, 41b corresponding to the two sides 14a, 14b of the corner floorboard 14. The cutout 41 may be formed by cutting out a corner of the floorboard 11, or may be formed into an L shape by combining multiple floorboards 11. The cutout 41 forms an opening 13 in the floor portion 6, and the corner floorboard 14 is accommodated inside the cutout 41 to close the opening 13.

[0037] The two sides 14a, 14b are the sides 14a, 14b farther from the floor beam 4 among the four sides 14a to 14d of the rectangular corner floor board 14, and are adjacent to each other and perpendicular to each other.

[0038] One side 14b is the side 14b along the floor joist 8 of the two sides 14a, 14b of the corner floor board 14 that are farther from the floor beam 4. The cutout portion 41 of the floor board 11 is cut along the floor joist 8 at a position directly above the floor joist 8 that is closest to the floor beam 4, forming the cutout side 41b. One side 14b of the corner floor board 14 is adjacent to the cutout side 41b of the cutout portion 41. Note that if the cutout side 41b of the cutout portion 41 is formed at a position shifted from above the floor joist 8, the floor joist 8 will not exist directly below the cutout side 41b, so the corner floor board 14 may have another reinforcing wooden crosspiece 21 similar to the other side 14a for the one side 14b.

[0039] The opposite end is the end of the other side 14a of the corner floor board 14 that is closer to the floor beam 4.

[0040] The floor board support 43 is a member that is attached to the floor beams 4 and supports the edge of the floor board 11 that runs along the floor beams 4. As shown in FIG. 8, the floor board support 43 is a long member (angle member) with an L-shaped cross section having a vertical surface and a horizontal surface, and extends along the floor beams 4. The floor board support 43 is fixed to the floor beams 4 by beam mounting parts 44. The beam mounting parts 44 are C-shaped members that form a closed cross section between themselves and the floor beams 4. Multiple beam mounting parts 44 are provided on the floor board support 43 (FIG. 2).

[0041] 2, the floor board support 43 is attached to the floor beam 4 parallel to the floor joists 8, so that the horizontal surface supports from below almost the entire edge of the floor board 11 along the floor board support 43. The vertical surface of the floor board support 43 attaches the beam mounting part 44 to the floor beam 4 and sets the height of the horizontal surface and the floor board 11.

[0042] The building units 1 are automatically assembled by a robot in a factory. At this time, the robot grasps the end of the floor beam 4 with its arm 45 as shown in Fig. 8. Therefore, a portion where the floor board support 43 cannot be installed is set at the end of the floor beam 4 to avoid interference with the robot's arm 45 (support installation prohibited portion). This support installation prohibited portion almost coincides with the part that will be the inside of the opening 13 of the corner portion 12, and the floor board support 43 can only be installed to the extent that it slightly intrudes into the opening 13 (opening intrusion portion 47, Fig. 7).

[0043] The other side 14a is the side 14a without the floor joist 8, of the two sides 14a, 14b of the corner floor board 14 that are farthest from the floor beam 4. When the corner floor board 14 is attached to the opening 13 of the corner portion 12, the other side 14a is supported from below at both ends by the floor joist 8 and the floor board support 43. The other side 14a is left unsupported in the middle. Therefore, a reinforcing wooden crosspiece 21 is provided on the floor board support 43 so that the reinforcing wooden crosspiece 21 can move to a state parallel to the other side 14a, and the reinforcing wooden crosspiece 21 can support the middle part of the other side 14a.

[0044] In this case, the reinforcing wooden crosspiece 21 may be moved or rotated so that both ends come into contact with the floor beam 8 and the floor board support 43. In this case, the reinforcing wooden crosspiece 21 is made to have the same length as the distance between the floor beam 8 and the floor board support 43. In addition, the reinforcing wooden crosspiece 21 may have an interference prevention clearance 48 between both ends and the floor beam 8 and the floor board support 43 (opening entry portion 47) so that the reinforcing wooden crosspiece 21 does not interfere with the floor beam 8 and the floor board support 43 when it is moved or rotated. The size of the clearance 48 is arbitrary, but it is preferable to make it smaller. In this case, the reinforcing wooden crosspiece 21 is made to have a length slightly shorter than the distance between the floor beam 8 and the floor board support 43. In addition, it is preferable that the reinforcing wooden crosspiece 21 is made to have a length at least 1 / 2 or more of the distance between the floor beam 8 and the floor board support 43.

[0045] The pivot shaft 31 is provided near one of the ends of the reinforcing wooden beam 21. More specifically, for example, as shown by the imaginary line in FIG. 6, the reinforcing wooden beam 21 is arranged parallel to the side 14a so that a part 21a of the width of the reinforcing wooden beam 21 extends outside the side 14a by a required amount with respect to the corner floor board 14. At this time, the reinforcing wooden beam 21 is arranged in a position where a clearance 48 can be secured between both ends and the floor joist 8 and the floor board support material 43 in the longitudinal direction of the side 14a of the corner floor board 14. In this state, a 45-degree line is drawn from the intersection of one end of the reinforcing wooden beam 21 and the boundary line between the part 21a and the other part 21b toward the other part 21b. The pivot shaft 31 is provided at a position on this 45-degree line that is approximately in the middle of the width of the other part 21b.

[0046] As a result, when the reinforcing wooden crosspiece 21 is rotated around the pivot shaft 31 from a state parallel to the side 14a as shown by the imaginary line to a vertical state as shown by the broken line, the side surface of the reinforcing wooden crosspiece 21 that becomes the other part 21b moves to the same position in the direction along the side 14a as the one end of the reinforcing wooden crosspiece 21 that is parallel to the side 14a, and the one end moves to a position where it overlaps with the side 14a. Also, when the reinforcing wooden crosspiece 21 is rotated from a state perpendicular to the side 14a to a parallel state, the part 21a of the width of the reinforcing wooden crosspiece 21 protrudes in an elongated manner along the longitudinal direction outside the side 14a. Note that the reinforcing wooden crosspiece 21 is movable (rotatable) before being attached to the opening 13 of the corner floor board 14, but after attachment, it is fixed so that it cannot move (rotate) relative to the corner floor board 14.

[0047] (4) In the above, as shown in FIG. 9, the floor portion 6 may have a wall support rail 53 for mounting an inner wall panel 52 to the edge portion of the floor board 11. The wall support rail 53 may be extended toward the interior side 54 beyond the inner wall panel 52 . The corner floor panel 14 may be installed at the corner portion 12 so as to be substantially flush with the wall support rail 53 and the floor panel 11 .

[0048] Here, the edge of the floor panel 11 is the side portion of the floor panel 11 that roughly follows the floor beam 4 , and is positioned on the floor beam 4 that forms the outer periphery of the floor portion 6 or slightly inward from the floor beam 4 .

[0049] The interior wall panel 52 is a panel that constitutes the interior wall of the building. The interior wall panel 52 is made to a height that reaches from the floor beams 4 to the ceiling beams 3 of the building unit 1. The interior wall panel 52 is provided at any one of the four side surfaces of the building unit 1 according to the building plan. The interior wall panel 52 is a member in which a surface material 52b such as plaster board is attached to the surface of a panel frame 52a that faces the interior side 54. The interior wall panel 52 may have an opening such as a window.

[0050] The wall support rail 53 is a long guide member used when attaching the interior wall panel 52 to the building unit 1. The wall support rail 53 is provided on the edge of the floor board 11 so as to follow the floor beam 4. The wall support rail 53 is installed on the end of the floor joist 8 or on the side surface of the floor board support material 43, aligned with the edge of the floor board 11. Note that in the drawing, only the portion of the wall support rail 53 inside the opening 13 is drawn, but in reality it is also provided on the outside of the opening 13. Also, the floor joist 8, floor board support material 43, interior wall panel 52, etc. are omitted and only a portion of the drawing is shown.

[0051] A plurality of the interior wall panels 52 are installed on the side surface of the building unit 1 along a wall support rail 53, and are fixed to the wall support rail 53 from the room side 54. By attaching the interior wall panels 52 along the wall support rail 53, the interior wall panels 52 can suppress and prevent the occurrence of surface differences between adjacent interior wall panels 52.

[0052] The indoor side 54 is the inside of the building unit 1. The outside of the building unit 1 is the outdoor side or the outdoor side, etc. (hereinafter referred to as the outdoor side). "Protruding toward the indoor side 54" means that the wall support rail 53 has a width large enough to protrude toward the indoor side 54 compared to the indoor side 54 surface of the interior wall panel 52. It is sufficient that the portion of the wall support rail 53 protruding toward the indoor side 54 (protruding portion 53a) is only slight.

[0053] The term "flush" refers to aligning the top surface 14f of the corner floor panel 14 to the top surfaces of the wall support rail 53 and floor panel 11 at approximately the same height level. This makes the floor section 6 flat. However, some degree of error is permitted.

[0054] <Function> The function of this embodiment is as follows.

[0055] The rectangular floor section 6 of the building unit 1 is formed by installing floor panels 11 and corner floor panels 14 on the floor frame 7. The floor panels 11 are large-sized surface materials 52b installed on the rectangular floor section 6 of the building unit 1 except for the corner sections 12, and are automatically installed by a robot in a factory. The corner floor panels 14 are small plate-like members installed in the cutouts 41 formed in the corner sections 12 of the floor section 6 to close the openings 13. The corner floor panels 14 are manually installed in the corner sections 12 by workers at the construction site after the openings 13 of the corner sections 12 are used as work space. The corner floor panels 14 are installed flush with the floor panels 11 in the openings 13.

[0056] Many of the assembly steps of the building unit 1 are automatically performed by robots. Therefore, structures suitable for robotic assembly work are adopted throughout. On the other hand, this affects the parts where robots are not used. For example, the floor board support 43 that supports the edge of the floor board 11 cannot be extended to the end of the floor beam 4 to avoid interference with the robot arm 45. Therefore, although the floor board support 43 can support the corner part between the side 14a and the side 14d of the corner floor board 14 at a point, it cannot stably support the side 14a or the side 14d of the corner floor board 14. Therefore, at the construction site, work such as separately attaching a member to be attached to the side 14a or the side 14d to the opening 13 is required, but for example, it is time-consuming to attach the member to be attached to the position of the notch 41 (the notch side 41a) of the floor board 11.

[0057] Therefore, the corner floor board 14 is provided with a reinforcing wooden crosspiece 21 fixed to the floor board 11 on the underside 14e of the plate-shaped main body that closes the opening 13 formed in the corner portion 12. The reinforcing wooden crosspiece 21 is installed on the main body so that it can move toward the floor board 11 from a state in which it is entirely hidden inside the main body of the corner floor board 14 to a state in which a portion 21a protrudes outside the main body.

[0058] 3, a corner floor panel 14 is installed in the opening 13 of the corner portion 12 of the floor section 6. Then, one side 14b of the corner floor panel 14 is engaged and held from below by the floor joist 8, adjacent to the notch 41 (notch side 41b) of the floor panel 11. The other side 14a of the corner floor panel 14 is attached to the notch side 41a of the floor panel 11 by the reinforcing wooden crosspiece 21, adjacent to the notch 41 (notch side 41a) of the floor panel 11.

[0059] The corner floor board 14 is adhered to the reinforcing wooden beam 21, floor joist 8, and opening insertion portion 47 of the floor board support material 43 with its sides 14a, 14b, and 14d resting on and supported from below, and is then fixed from above with fasteners such as screws 61. Thus, the corner floor board 14 is fixed at the three corners and at least two sides 14a and 14b, so it can be easily and reliably attached to the opening 13 in a stable state.

[0060] <Effects> The effects of this embodiment are as follows.

[0061] (Effect 1) The corner floor board 14 is provided with a reinforcing wooden crosspiece 21 on the underside 14e of the plate-like body that closes the opening 13 formed in the corner portion 12 of the floor portion 6, so that the corner floor board 14 can be easily fixed to the floor board 11 even if there is no other member to be attached to the corner portion 12. By fixing the corner floor board 14 to the floor board 11, the corner floor board 14 is integrated with the floor board 11 via the reinforcing wooden crosspiece 21, and is simply, reliably and stably installed in the corner portion 12 of the floor portion 6. The reinforcing wooden crosspiece 21 reinforces the attachment portion (side 14a and notched side 41a) between the corner floor board 14 and the floor board 11. This makes it unnecessary to separately attach a member to be attached to the corner portion 12 of the floor portion 6 at the construction site.

[0062] At this time, by attaching the reinforcing wooden crosspieces 21 to the corner floor boards 14 in advance, the work of attaching the reinforcing wooden crosspieces 21 to the corner floor boards 14 at the construction site is eliminated, and the accuracy of the attachment of the reinforcing wooden crosspieces 21 to the corner floor boards 14 is ensured. This also prevents forgetting to attach the reinforcing wooden crosspieces 21 due to careless mistake or lack of awareness (or installing the corner floor board 14 with the reinforcing wooden crosspieces 21 missing). And by attaching the reinforcing wooden crosspieces 21 to the corner floor boards 14, which are smaller than the floor boards 11, management of the components becomes easier and loss of the reinforcing wooden crosspieces 21 can be prevented.

[0063] By attaching the reinforcing wooden crosspiece 21 to the corner floor board 14 so that it can move toward the floor board 11, the reinforcing wooden crosspiece 21 can be entirely hidden inside the corner floor board 14 so that it does not get in the way before the corner floor board 14 is fixed to the corner portion 12. When the corner floor board 14 is fixed to the corner portion 12, the reinforcing wooden crosspiece 21 is moved from its retracted state to a state in which a portion 21a protrudes outward from the corner floor board 14. This allows the reinforcing wooden crosspiece 21 to be fixed to the floor board 11 using the portion 21a protruding outward from the corner floor board 14.

[0064] In addition, by attaching the reinforcing wooden crosspieces 21 to the side of the corner floorboards 14, the reinforcing wooden crosspieces 21 do not need to be attached to the side of the floorboards 11 that are larger than the corner floorboards 14. The floorboards 11 cannot be stacked if the reinforcing wooden crosspieces 21 are attached. Therefore, the reinforcing wooden crosspieces 21 hinder the automatic installation of the floorboards 11 by a robot, but by not attaching the reinforcing wooden crosspieces 21 to the floorboards 11, the floorboards 11 can be automatically installed by a robot.

[0065] (Effect 2) The reinforcing wooden crosspiece 21 is supported by the pivot shaft 31 on the corner floor panel 14. This allows the reinforcing wooden crosspiece 21 to move by rotating relative to the corner floor panel 14. Then, based on the state where the corner floor panel 14 is installed in the corner portion 12, the reinforcing wooden crosspiece 21 is perpendicular to the sides 14a, 14b of the corner floor panel 14 that are adjacent to the floor panel 11. This allows the reinforcing wooden crosspiece 21 to be completely hidden inside the corner floor panel 14 and to be stored small inside the corner floor panel 14. Therefore, the corner floor panel 14 can be easily temporarily placed in the corner portion 12 in an unfixed state. In addition, the temporarily placed corner floor panel 14 can be easily removed from the corner portion 12.

[0066] At the construction site, the corner floor panel 14 is removed from the corner portion 12, and the opening 13 of the corner portion 12 is used as a work space to carry out necessary work (such as connecting and fixing the upper and lower building units 1), and then the corner floor panel 14 is permanently fixed to the corner portion 12 to close the opening 13. As a result, the floor portion 6 is finished in a rectangular shape with the opening 13 of the corner portion 12 closed.

[0067] At this time, by rotating the reinforcing wooden crosspiece 21 so that it is parallel to the sides 14a, 14b of the corner floor board 14 that are adjacent to the floor board 11, a portion 21a of the reinforcing wooden crosspiece 21 along its longitudinal width protrudes outward from the corner floor board 14. Therefore, the corner floor board 14 is attached to the floor board 11 via the reinforcing wooden crosspiece 21 by using the elongated protruding portion 21a of the reinforcing wooden crosspiece 21 as an attachment margin and overlapping and fixing the attachment margin to the floor board 11. Specifically, the side 14a of the corner floor board 14 is attached to the floor board 11 (the notched side 41a).

[0068] When attaching the corner floor board 14 to the floor board 11, for example, the reinforcing wooden battens 21 are fixed to the corner floor board 14 and the floor board 11 with adhesive, and the corner floor board 14 and the reinforcing wooden battens 21, and the floor board 11 and the reinforcing wooden battens 21 are fixed (from above) with fasteners such as screws 61.

[0069] (Effect 3) The corner floor board 14 is accommodated and installed in the L-shaped cutout portion 41 of the floor board 11. At this time, the two sides 14a, 14b of the corner floor board 14 are adjacent to the L-shaped cutout portion 41 of the floor board 11 (the cutout sides 41a, 41b).

[0070] One side 14b of the corner floor board 14 adjacent to the floor board 11 is supported from below by the floor beam 8 together with the cutout 41 (cutout side 41b) of the floor board 11. The other side 14a of the corner floor board 14 adjacent to the floor board 11 has its end on the side of the floor beam 8 supported from below by the floor beam 8 at a point, and its end opposite the floor beam 8 is supported from below by the floor board support material 43 together with the end of the L-shaped cutout 41 (cutout side 41a) of the floor board 11 at a point.

[0071] During installation, the reinforcing wooden crosspiece 21 is moved to a state parallel to side 14a and extends along side 14a below the other side 14a of the corner floor board 14, thereby being installed in the middle of the other side 14a, connecting the floor joist 8 and the floor board support material 43 in an approximately linear manner.

[0072] As a result, the other side 14a of the corner floor board 14 is attached to (the notch side 41a of) the L-shaped cutout 41 in the floor board 11 via the reinforcing wooden crosspiece 21, and the reinforcing wooden crosspiece 21 reinforces the area between the other side 14a of the corner floor board 14 and the cutout 41 in the floor board 11. Therefore, the two sides 14a, 14b of the corner floor board 14 are securely fixed inside the L-shaped cutout 41 in the floor board 11 along (the cutout sides 41a, 41b of) the L-shaped cutout 41.

[0073] (Effect 4) When a construction method is used in which prefabricated interior wall panels 52 are attached to the building units 1 in a factory, a wall support rail 53 may be attached to the building units 1, and the interior wall panels 52 may be installed on the wall support rail 53. The wall support rail 53 is attached to the ceiling or floor 6 of the building units 1. The wall support rail 53 of the floor 6 is installed so as to extend along the edge of the floorboard 11. The wall support rail 53 also extends into the corner portion 12.

[0074] At this time, for example, as shown in the comparative example of Figure 10, if a narrow wall support rail 71 is used, the wall support rail 71 will be recessed toward the outside of the room relative to the interior wall panel 52. Therefore, the corner floor board 14 will be slightly recessed under the interior wall panel 52 in the corner portion 12 (recessed portion 72), making it difficult to remove the corner floor board 14.

[0075] Therefore, as shown in Fig. 9, the width of the wall support rail 53 is widened so that the wall support rail 53 projects toward the room side 54 relative to the inner wall panel 52 (projection portion 53a). As a result, the corner floor board 14 projects from the inner wall panel 52, and the corner floor board 14 can be easily removed from the opening 13. When the removability of the corner floor board 14 is ensured in this way, the overlapping allowance 47a of the corner floor board 14 with the floor board support material 43 (the opening insertion portion 47) is reduced by the amount that the width of the wall support rail 53 is widened (overhanging allowance 47a (Fig. 9(a)) < overlapping allowance 73 (Fig. 10(a))). Therefore, it becomes difficult for the floor board support material 43 to support the corner floor board 14 (the corner portion) with the opening insertion portion 47.

[0076] Therefore, a reinforcing wooden crosspiece 21 is attached to the corner floor board 14 so that the corner floor board 14 can be fixed directly to the floor board 11 by the reinforcing wooden crosspiece 21. This makes it possible to fix the corner floor board 14 directly to the floor board 11 by the reinforcing wooden crosspiece 21 even if the floor board support material 43's overlapping allowance 47a with the corner floor board 14 becomes small due to the wide wall support rail 53. At this time, the corner floor board 14 is installed in a state where it is almost flush with the wall support rail 53 and the floor board 11 at the corner portion 12. In addition, the adjacent sides (side 14a and notched side 41a) of the corner floor board 14 and the floor board 11 are reinforced by the reinforcing wooden crosspiece 21. This provides a structure in which the interior wall panel 52 can be attached using the wall support rail 53. [Explanation of symbols]

[0077] 1 Building unit 4 Floor beam 6 Floor 8 Floor beam 11 Floorboards 12 Corner 14 Corner floor board 14a The other side 14b One side 14e Bottom side 21 Reinforced wooden beam 21a part 31 Rotating shaft 41 Notch 43 Floor plate receiving material 52 Interior wall panel 54 Indoor 71 Wall support rail

Claims

1. A floor plate is installed in a portion of the rectangular floor portion of the building unit excluding the corner portions; A corner floor plate installed at the corner portion of the floor section; A floor structure of a building unit comprising: The corner floor board has a reinforcing wooden beam on the underside thereof for fixing to the floor board, The floor structure of a building unit is characterized in that the reinforcing wooden battens are installed on the corner floor boards so that they can move toward the floor boards from a state in which they are completely hidden inside the corner floor boards to a state in which a portion of them protrudes outside the corner floor boards.

2. A floor structure of a building unit according to claim 1, A floor structure of a building unit, characterized in that, based on the state in which the corner floor board is installed at the corner portion, the reinforcing wooden batten is supported by a pivot shaft so as to rotate from a perpendicular state to a side of the corner floor board adjacent to the floor board, to a parallel state in which a part of the width of the corner floor board protrudes outside the corner floor board.

3. A floor structure of the building unit according to claim 1 or 2, The floor panel is provided with an L-shaped cutout portion at the position of the corner portion to accommodate the corner floor panel, and the corner floor panel is installed in the L-shaped cutout portion so that the two sides are adjacent to the floor panel; A floor beam is provided under one of the edges of the corner floor board adjacent to the floor board and the cutout portion, A floor board support member is provided under the end of the other side of the corner floor board adjacent to the floor board and the cutout portion opposite the floor beam, The other side of the corner floor board is bridged between the floor beam and the floor board support material, A floor structure of a building unit, characterized in that the reinforcing wooden beam is moved so as to be parallel to the other side when installed, and is installed in the middle of the other side.

4. A floor structure of the building unit according to claim 1 or 2, The floor portion has a wall support rail for attaching an interior wall panel to an edge portion of the floor plate, The wall support rail protrudes toward the interior side of the room beyond the interior wall panel, A floor structure of a building unit, characterized in that the corner floor panel is installed flush with the wall support rail and the floor panel at the corner portion.

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