Building

Abstract

To appropriately install staircases in buildings constructed using the unit construction method.SOLUTION: In a building 10, a first unit set X1 and a second unit set X2, which are a combination of an upper floor unit and a lower floor unit, are placed apart from each other with an intermediate region R1 between them, and a part of the intermediate region R1 forms an open-ceiling space S1 that spans the lower floor and the upper floor. A staircase portion 50 extending in the direction in which the units are placed apart is provided in the open-ceiling space S1. In a plan view, the open-ceiling space S1 is provided between the floor end portion on the intermediate region side of the floor portion provided in the upper floor unit of the first unit set X1 and the ceiling end portion on the intermediate region side of the ceiling portion provided in the lower floor unit of the second unit set X2. The staircase portion 50 is provided so that its upper end is fixed to the floor end portion of the upper floor unit of the first unit set X1 and its lower stage part is located on the floor portion of the lower floor unit of the second unit set X2.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a building comprising a plurality of building units. [Background technology]

[0002] In modular buildings (unit-construction buildings) that are made up of multiple building units, various techniques have been proposed for assembling staircases into building units. For example, a known configuration involves assembling a straight staircase within a building unit with the upper end of the staircase fixed to a ceiling beam in the building unit to which the staircase is to be assembled.

[0003] On the other hand, a modular building with a configuration in which building units are spaced apart from each other is known, and a technique has been proposed for installing a staircase between the spaced apart building units in such a modular building. For example, in the technique described in Patent Document 1, a long rectangular staircase is arranged between the spaced apart building units, extending in a direction perpendicular to the direction in which the opposing building units face each other. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5970306 Summary of the Invention [Problem to be solved by the invention]

[0005] In a configuration where a straight staircase is installed within a building unit, it is conceivable that the upper end of the staircase section is fixed to one of a pair of ceiling girders that face each other in the short side direction (gable direction) of the building unit, and the other ceiling girder is positioned above the middle part of the staircase section. In this case, the ceiling girders and the middle part of the staircase section will overlap in the vertical direction, and there is a concern that when a person goes up or down the staircase section, the ceiling structure near the ceiling girders will be in close proximity to the person.

[0006] Furthermore, the staircase installation structure described in Patent Document 1 is limited to a configuration in which a long rectangular staircase is arranged between spaced-apart building units in a direction perpendicular to the direction in which the units face each other. In this case, in a modular building, it may be difficult to install a staircase depending on the arrangement pattern of the building units. For example, if the site on which the building is to be constructed is narrow and the building has a small width, it is conceivable that the building units will be arranged in a single row, and in such a case, it will be difficult to arrange a staircase in a direction perpendicular to the direction in which the units face each other.

[0007] The present invention has been made in consideration of the above circumstances, and its main object is to provide a suitable installation method for a staircase section in a building constructed using the unit construction method. [Means for solving the problem]

[0008] In order to solve the above problems, the building of the first invention is: A building comprising a plurality of building units formed by connecting beams and columns, and having upper and lower floors adjacent to each other in the vertical direction, The building comprises a first unit set and a second unit set as a combination of an upper floor unit, which is the building unit on the upper floor side, and a lower floor unit, which is the building unit on the lower floor side, and the unit sets are spaced apart from each other across an intermediate area, and at least a part of the intermediate area is an open-ceiling space spanning the lower floor and the upper floor, A staircase section is provided in the atrium space, with the first unit set side on the upper side and the second unit set side on the lower side, and extending in a direction in which the unit sets are spaced apart, In a plan view, the atrium space is provided between a floor end portion of a floor portion provided in the upper floor unit of the first unit set on the side of the intermediate region and a ceiling end portion of a ceiling portion provided in the lower floor unit of the second unit set on the side of the intermediate region, The staircase section is characterized in that its upper end is fixed to the floor end of the upper floor unit of the first unit set, and its lower part, including at least the first step from the bottom, is positioned on the floor of the lower floor unit of the second unit set.

[0009] In a modular construction building, a first unit set and a second unit set, which are combinations of building units on upper and lower floors, are placed apart from each other with a middle area between them, with at least a portion of the middle area being an open-ceiling space, and a staircase section extending in the direction in which the unit sets are spaced apart is provided in the open-ceiling space. In this case, the open-ceiling space is provided, in a plan view, between the floor edge on the middle area side of the upper floor unit of the first unit set and the ceiling edge on the middle area side of the lower floor unit of the second unit set, and since there are no building units in the middle area between the unit sets, it is possible to expand the open-ceiling space in the direction in which the unit sets are spaced apart compared to a configuration in which building units are present in the middle area.

[0010] In a configuration in which the atrium space is expanded in the direction of the placement of the unit sets as described above, the expansion of the atrium space allows the staircase to be installed closer to one of the unit sets (the first unit set). Therefore, in a configuration in which the lower section of the staircase, including at least the first tread from the bottom, is positioned above the floor of the lower unit of the second unit set—in other words, in a configuration in which a portion of the staircase overlaps below the edge of the ceiling facing the atrium space in the second unit set—the height near the staircase entrance can be expanded. As a result, staircases can be conveniently installed in buildings constructed using the unit construction method.

[0011] In the second invention, the upper end of the staircase section is fixed to the floor structure of the upper floor unit of the first unit set.

[0012] In a configuration in which the upper end of the staircase is fixed to the floor structure of the upper unit in the first unit set, the staircase can be shifted to a position closer to the outside of the middle area, compared to a configuration in which the staircase is supported by a building unit in the middle area. This makes it possible to make the most effective use of the expandable atrium space and ideally increase the ceiling height of the middle part of the staircase on the second unit set side.

[0013] In the third invention, it is assumed that a virtual building unit is installed in the intermediate area, and when the boundary line between the building unit of each unit set and the virtual building unit is a virtual docking line, the open-air space is between the virtual docking line on the first unit set side and the virtual docking line on the second unit set side.

[0014] In a configuration where two unit sets are placed apart, an open-ceiling space can be formed with a virtual docking line, which is the boundary between the building units of each unit set and the virtual building unit (the virtual unit in the middle area), as its base point. This allows for the maximum expansion of the open-ceiling space in the direction of the unit separation in a modular building.

[0015] In the fourth invention, the stair section has a long and rectangular shape when viewed in a plane, a straight stair section in which the ascending and descending direction is linear, and a curved stair section provided at least at either the lower end or the upper end of the straight stair section, with the staircase entrance oriented in a direction that intersects with the ascending and descending direction of the straight stair section.

[0016] When comparing a straight staircase structure consisting of only straight staircase sections, which are long and rectangular in plan view, with a curved staircase structure consisting of a combination of straight staircase sections and curved staircase sections, it is expected that the length of the curved staircase structure will be longer even if the number of steps is the same.In this regard, by configuring the staircase section to be located in an open-ceiling space that is expanded in the direction of unit placement as described above, it is possible to preferably install a curved staircase structure, which has a relatively long length in the longitudinal direction.

[0017] In the fifth invention, the building unit has a rectangular shape with long sides and short sides when viewed in a plane, and the building units are arranged in a row on the upper floor and the lower floor with the long sides facing each other, and each unit set and the intermediate area have the same length dimension in the unit short side direction, and the length dimension in the long direction of the staircase section is greater than the length dimension in the unit short side direction of the intermediate area.

[0018] In modular buildings, by arranging multiple building units in a row with their long sides facing each other, the building can be constructed appropriately even on a narrow site. Furthermore, by making the length of the short sides of the units the same in each unit set and in the intermediate area, and making the length of the long side of the staircase longer than the length of the short sides of the units in the intermediate area, in modular buildings with spaced units, the basic structure of a modular building of the same size constructed without spaced units can be reused, and the staircase can be properly installed by extending from the intermediate area to the second unit set, regardless of the length of the long sides of the building units. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing the configuration of a modular building. [Figure 2] FIG. [Figure 3] FIG. 10 is a perspective view showing a configuration in which the units are placed separately. [Figure 4] A floor plan showing the layout of the first floor of the building. [Figure 5] Plan view of the staircase. [Figure 6] FIG. 10 is a front view showing the assembled state of the staircase section in the building. [Figure 7] 10A and 10B are diagrams for explaining the difference in staircase structure between the embodiment and a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the building is a two-story building constructed by a unit construction method. In other words, the building is a unit building formed by combining a plurality of building units. Figure 1 is a perspective view showing the configuration of the unit building in this embodiment.

[0021] As shown in Figure 1, building 10 has a building body 12 disposed on foundation 11 and a roof 13 disposed above building body 12. Building body 12 is two-story, consisting of a first floor portion 14 as the lower floor and a second floor portion 15 as the upper floor. Building body 12 is constructed by connecting a plurality of rectangular parallelepiped building units 20 to each other. For convenience in the following explanation, building unit 20 of first floor portion 14 will also be referred to as lower floor unit 20A, and building unit 20 of second floor portion 15 will also be referred to as upper floor unit 20B.

[0022] The building units 20 are rectangular parallelepipeds with long and short sides in plan view, and the building 10 is constructed by arranging the building units 20 in a row with their long sides facing each other on the first floor 14 and second floor 15. This makes it possible to construct the building 10 conveniently even on a narrow lot.

[0023] 1 was constructed using a unit separation construction method, and the separation of the building units 20 forms an intermediate region R1 where no building units 20 exist. Here, if a combination of a lower floor unit 20A and an upper floor unit 20B adjacent to each other in the vertical direction is called a unit set X, the building 10 has a plurality of unit sets X, and is configured such that an intermediate region R1 is formed between a first unit set X1 and a second unit set X2 in the unit arrangement direction in which the building units 20 are lined up. In other words, the unit sets X1 and X2 are placed apart from each other with the intermediate region R1 in between.

[0024] The intermediate area R1 may be provided as an area of ​​the same size as each of the unit sets X1 and X2. In the building 10, the building body 12 is constructed using a total of six building units 20, but the interior space of the building is substantially the same size as if it were constructed using eight building units 20.

[0025] Fig. 2 shows a perspective view of a building unit 20. As shown in the figure, the building unit 20 comprises four pillars 21 arranged at its four corners, and four ceiling girders 22 and floor girders 23 that connect the upper and lower ends of each pillar 21, respectively. These pillars 21, ceiling girders 22, and floor girders 23 form a rectangular parallelepiped skeleton (frame). The pillars 21 are made of rectangular steel tubes. The ceiling girders 22 and floor girders 23 are made of channel steel with a U-shaped cross section, and are installed so that their openings face each other.

[0026] A plurality of ceiling joists 25 are spanned at predetermined intervals between opposing ceiling girders 22 on the long sides of the building unit 20. Similarly, a plurality of floor joists 26 are spanned at predetermined intervals between opposing floor girders 23 on the long sides of the building unit 20. The ceiling joists 25 and floor joists 26 are each provided at equal intervals and in corresponding positions above and below. For example, the ceiling joists 25 are made of lip channel steel, and the floor joists 26 are made of square steel. The ceiling joists 25 support a ceiling surface material 27, and the floor joists 26 support a floor surface material 28.

[0027] FIG. 3 is a perspective view showing a configuration in which units are spaced apart. As shown in FIG. 3, a plurality of connecting members are spanned between each of the building units 20 spaced apart from one another. The connecting members include connecting ceiling girders 31 attached between the ceiling girders 22 on the end sides of each of the spaced apart building units 20 so as to be aligned with the ceiling girders 22, and connecting floor girders 32 attached between the floor girders 23 on the end sides of each of the building units 20 so as to be aligned with the floor girders 23. FIG. 3 shows the connecting ceiling girders 31 and connecting floor girders 32 separated one by one. The connecting ceiling girders 31 and connecting floor girders 32 are made of channel steel, like the ceiling girders 22 and floor girders 23. Although not shown, the connecting ceiling girders 31 and connecting floor girders 32 are connected to the columns 21 of each building unit 20 (more specifically, to the joints of the columns 21) by brackets.

[0028] The connecting members also include connecting ceiling joists 33 attached between the ceiling girders 22 on the girder side of each of the spaced-apart building units 20, and connecting floor joists 34 attached between the floor girders 23 on the girder side of each of the building units 20. The connecting ceiling joists 33 and connecting floor joists 34 are made of square steel, just like the ceiling joists 25 and floor joists 26. Although not shown in the figures, the connecting ceiling joists 33 and connecting floor joists 34 are connected to the ceiling girders 22 and floor girders 23 on the girder side of each of the building units 20, respectively, by brackets.

[0029] Fig. 4 is a plan view showing the floor plan of the first floor of the building 10. Fig. 4 shows the floor plan of the portion corresponding to the unit sets X1 and X2 and the intermediate area R1 between the unit sets X1 and X2. In Fig. 4, the unit sets X1 and X2 are spaced apart in the left-right direction, which is the direction in which the units are spaced apart.

[0030] In Fig. 4, DL1 to DL3 are docking lines indicating the boundary lines between the building units 20. In this embodiment, it is assumed that a building unit 20 (unit set X) is installed in the intermediate region R1, and the boundary line between the first unit set X1 and the intermediate region R1 (virtual building unit) is set as docking line DL1, and the boundary line between the second unit set X2 and the intermediate region R1 (virtual building unit) is set as docking line DL2. In this case, the intermediate region R1 is the region between the docking lines DL1 and DL2. Note that docking line DL3 is the boundary line between adjacent unit sets X (building units 20).

[0031] As shown in Figure 4, the first floor of the building 10 is provided with an entrance hall 41, living rooms 42, a corridor 43, a staircase space 44, a toilet 45, a storage room 46, and the like. The staircase space 44 and the storage room 46 are arranged side by side in the direction in which the units are spaced apart, and a partition wall 47 is provided between them. The staircase space 44 is provided with a stair section 50 made up of stair units. The stair section 50 has an elongated, rectangular shape in a plan view. A toilet 45 is provided in the under-stair space below each tread of the staircase section 50.

[0032] Additionally, the building 10 has an open-ceiling space S1 spanning the lower and upper floors of the building 10, in a position that overlaps with the staircase space 44 in a plan view. The open-ceiling space S1 is located above the staircase section 50. The open-ceiling space S1 is located close to the exterior wall on the gable side of the building unit 20, with its longitudinal direction extending in the direction in which the units are placed apart (left and right in the figure). When people go up and down the staircase section 50, they can move between the first floor section 14 and the second floor section 15 in the open-ceiling space S1.

[0033] Next, the configuration of the stair section 50 will be described. Fig. 5 is a plan view of the stair section 50 in this embodiment, and Fig. 6 is a front view showing the assembled state of the stair section in the building 10. In Fig. 6, (a) shows the stair structure of this embodiment, and (b) shows a comparative stair structure for comparison. Fig. 6(a) is a cross-sectional view taken along line AA in Fig. 4. In addition to docking lines DL1 and DL2, Fig. 6 also shows module lines ML indicating the reference positions of each pillar 21 of the building unit 20. The module lines ML are positions determined based on a reference dimension of 1000 mm in the case of meter modules, and based on a reference dimension of 910 mm in the case of shaku modules.

[0034] As shown in Figure 6(a), an open-ceiling space S1 is formed between the unit sets X1 and X2 on the left and right sides of the figure. In the open-ceiling space S1, in the inter-floor portion between the first and second floors, an open-ceiling opening 71 is formed between the floor edge E1 of the upper-floor unit 20B on the first unit set X1 side and the waist wall 48 of the upper-floor unit 20B on the second unit set X2 side, and the open-ceiling opening 71 has a horizontal opening dimension W1. In this case, the opening dimension W1 is determined by the docking line DL1 on the first unit set X1 side and the docking line DL2 on the second unit set X2 side, and more specifically, by the effective width between the docking lines DL1 and DL2 (the width dimension minus the thickness of walls, columns, etc. provided on the docking lines).

[0035] As shown in Figures 5 and 6(a), the stair section 50 includes multiple treads 51, a pair of side panels 52 supporting both ends of the multiple treads 51, and multiple risers 53 between each tread 51. The stair section 50 also includes a straight stair section A1, whose ascending / descending direction is linear, and a curved stair section A2, located below the straight stair section A1 and at the top of the stair section 50. The straight stair section A1 is configured with multiple treads 51 that are rectangular (e.g., elongated square) in plan view and arranged parallel to each other, while the curved stair section A2 is configured with multiple treads 51 that are generally fan-shaped and arranged radially in plan view. The curved stair section A2 is configured with multiple treads 51 (specifically, the first to third steps) from the bottom. The downward-curving stair section 50 allows the top of the staircase to be oriented perpendicular to the ascending / descending direction of the straight stair section A1.

[0036] The upper end of the staircase section 50 is fixed to the floor structure of the upper floor unit 20B in the first unit set X1. Specifically, the upper floor unit 20B has, as its floor structure, floor girders 23 and a floor surface material 28 fixed to the upper side of the floor girders 23, and the upper end of the side panel 52 of the staircase section 50 is fixed to the end (floor end E1) of the floor surface material 28. Note that the fixing structure of the upper staircase upper end to the floor structure of the upper floor unit 20B can be changed. For example, the upper staircase upper end may be fixed to the floor girders 23 of the upper floor unit 20B. Furthermore, although not shown, a bracket (support member) may be provided on the staircase section 50, and the bracket may be used to fix the upper floor unit 20B to the floor structure.

[0037] Furthermore, the lower end of the staircase section 50 is fixed to the floor of the lower floor unit 20A in the second unit set X2. Specifically, the lower end of the side panel 52 of the staircase section 50 is fixed to the floor surface material 28 of the lower floor unit 20A. The staircase section 50 is preferably supported by a partition wall 54 at its middle portion in the vertical direction. A toilet space may be defined below the staircase section 50 by the partition wall 54. The staircase section 50 is preferably designed to be assembled after each building unit 20 has been installed on the foundation 11 at the construction site during construction of the building 10.

[0038] The staircase section 50 is provided so as to straddle the docking line DL2 on the second unit set X2 side. In other words, the staircase section 50 is configured so that the bottom several steps (for example, two steps) extend beyond the intermediate region R1 toward the second unit set X2. Therefore, when a person ascends or descends the staircase section 50, they pass under the first-floor ceiling of the second unit set X2 at a position higher than the first-floor floor surface. In this case, the height dimension near the entrance of the staircase section 50, i.e., the vertical distance between a predetermined step near the entrance of the staircase section 50 (the third step 51 in the figure) and the first-floor ceiling surface on the second unit set X2 side, is H1.

[0039] On the other hand, in the configuration shown in Fig. 6(b), another intermediate unit set X11 is provided between the unit sets X1 and X2, and the intermediate unit set X11 is provided with a staircase section 60. The staircase section 60 shown in Fig. 6(b) has a straight staircase structure.

[0040] In the configuration of Figure 6(b), an open-ceiling space S2 is formed in the intermediate unit set X11. Here, in the intermediate unit set X11, an open-ceiling opening 72 is formed in the inter-story portion between a pair of ceiling girders 22 facing each other in the gable direction in the lower floor unit 20A, and between a pair of floor girders 23 facing each other in the gable direction in the upper floor unit 20B, and the horizontal opening dimension of the open-ceiling opening 72 is W2. In this case, the opening dimension W2 is determined by the module line ML of the building units 20 in the intermediate unit set X11, and more specifically, by the effective width between the module lines ML.

[0041] Similar to the staircase section 50 shown in Fig. 6(a), the staircase section 60 comprises a plurality of treads 61, a pair of side panels 62 supporting both ends of the treads 61, and a plurality of risers 63 provided between the treads 61. The upper end of the staircase section 60 is fixed to the floor structure of the upper floor unit 20B in the intermediate unit set X11. The lower end of the staircase section 60 is fixed to the floor of the lower floor unit 20A in the second unit set X2.

[0042] The stairway section 60 is provided so as to straddle the docking line DL2 on the second unit set X2 side, similar to the stairway section 50. In this case, the height dimension near the entrance of the stairway section 60, i.e., the vertical distance between a predetermined step near the entrance of the stairway section 60 (the third step 51 in the figure) and the first floor ceiling surface of the intermediate unit set X11, is H2.

[0043] Here, the differences between the staircase structures in Figures 6(a) and (b) will be explained. Figure 7 is a diagram for explaining the differences between the staircase structures in Figures 6(a) and (b). In Figure 7, for convenience, the step-like slopes of the staircase sections 50, 60 are shown as straight lines, with the solid lines corresponding to the staircase structure of this embodiment (the staircase structure in Figure 6(a)) and the dashed lines corresponding to the comparative staircase structure (the staircase structure in Figure 6(b)). The module lines ML1 and ML2 in the figure are respectively the module lines of the column portions of the building units 20 in the intermediate unit set X11.

[0044] 7, in the configuration of this embodiment, the open-ceiling opening 71 has an opening dimension W1 approximately between the docking lines DL1 and DL2 between the unit sets X1 and X2 that are spaced apart from each other, whereas in the configuration of the comparative example, the open-ceiling opening 72 has an opening dimension W2 approximately between the module lines ML1 and ML2 in the middle unit set X11. In this case, the opening dimensions W1 and W2 have a relationship of W1>W2.

[0045] In the configuration of this embodiment, the support position for supporting the staircase upper end is P11 on the docking line DL1, whereas in the configuration of the comparative example, the support position for the staircase upper end is P21 on the module line ML1. As a result, in the staircase section 50 of this embodiment, the upper end is fixed at a position closer to the first unit set X1 than in the staircase section 60 of the comparative example. In this case, as shown in FIG. 7, the installation position of the staircase section 50 can be shifted toward the first unit set X1 in the unit spacing direction. This makes it possible to increase the height clearance (headroom when ascending or descending the stairs) relative to the first floor ceiling surface near the staircase entrance.

[0046] That is, in the configuration of this embodiment, the height dimension H1 to the first floor ceiling surface near the staircase entrance is determined by the height position P12 of the first floor ceiling surface and the tread height position P13 of the staircase section 50 on the docking line DL2. On the other hand, in the configuration of the comparative example, the height dimension H2 to the first floor ceiling surface near the staircase entrance is determined by the height position P22 of the first floor ceiling surface and the tread height position P23 of the staircase section 60 on the module line ML2. In this case, the height dimensions H1 and H2 have a relationship of H1 > H2. Therefore, when a person goes up or down the staircase section 50, the person's head or the like is prevented from coming into contact with the first floor ceiling surface or coming into contact with the first floor ceiling surface.

[0047] Furthermore, in the configuration in which the position of the upper end of the stairs (P11) is on the docking line DL1 as described above, it is possible to make the inclination angle of the stair section 50 gentler than in the configuration in which the position of the upper end of the stairs (P21) is on the module line ML1.

[0048] In this embodiment, as shown in Figure 5, the stair section 50 has a downward curved structure consisting of a straight stair section A1 and a curved stair section A2, and in the curved stair section A2, a plurality of roughly fan-shaped treads 51 are arranged radially. In this case, in a stair section 50 with a downward curved structure having, for example, three steps of roughly fan-shaped treads 51 as the curved stair section A2, the total length of the stair section 50 is longer than that of a straight stair section in which all the treads 51 are rectangular (e.g., elongated). However, in this embodiment, the support position supporting the upper end of the stairs is shifted toward the first unit set X1, so that the stair section 50 can be suitably installed in the intermediate region R1 even if the total length of the stair section 50 is longer.

[0049] By making the stair section 50 a curved-down structure, people can enter and exit the stair section 50 at a side position (corridor 43 in Figure 4) perpendicular to the longitudinal direction of the stair section 50. In this case, if the stair section 50 were a straight staircase structure, it would be necessary to extend the corridor 43 in the longitudinal direction of the stair section 50 just before the first tread 51 (to the right of the stair section 50 in Figure 4). In contrast, by making the stair section 50 a curved-down structure, it is no longer necessary to extend the corridor 43 in the longitudinal direction of the stair section 50. Therefore, as shown in Figure 4, it is possible to provide a storage room 46 or the like in the longitudinal direction of the stair section 50, separated by a partition wall 47.

[0050] According to the configuration of this embodiment described above in detail, the following excellent effects can be obtained.

[0051] In a building 10 constructed using the unit spacing method, a portion of the intermediate region R1 between each of the unit sets X1 and X2 is made into an open-ceiling space S1, and a staircase section 50 extending in the unit spacing direction is provided in the open-ceiling space S1. In this case, in a plan view, the open-ceiling space S1 is provided between the floor edge on the intermediate region side of the upper floor unit 20B of the first unit set X1 and the ceiling edge on the intermediate region side of the lower floor unit 20A of the second unit set X2, and since no building units 20 are present in the intermediate region R1, it is possible to expand the open-ceiling space S1 in the unit spacing direction compared to a configuration in which the building units 20 are present in the intermediate region R1.

[0052] In the above-described configuration in which the open-ceiling space S1 is expanded in the direction in which the units are spaced apart, the expansion of the open-ceiling space S1 allows the staircase section 50 to be installed closer to one of the unit sets (first unit set X1). Therefore, in a configuration in which the lower section of the staircase section 50, including at least the first tread 51 from the bottom, is positioned on the floor of the lower-floor unit 20A of the second unit set X2—in other words, in a configuration in which a portion of the staircase section 50 overlaps below the edge of the ceiling on the open-ceiling space S1 side of the second unit set X2—the height near the staircase entrance can be expanded. As a result, the staircase section 50 can be conveniently installed in a unit-construction building 10.

[0053] In the configuration in which the upper end of the staircase section 50 is fixed to the floor structure of the upper floor unit 20B in the first unit set X1, it is possible to shift the staircase section 50 to a position closer to the outside of the intermediate region R1, compared to a configuration in which the staircase section 50 is supported by the building units 20 present in the intermediate region R1. This makes it possible to make the most effective use of the expandable open-ceiling space S1, and to preferably increase the ceiling height of the middle part of the staircase on the second unit set X2 side.

[0054] In a configuration in which the two unit sets X1 and X2 are spaced apart, an open-ceiling space S1 can be formed with the virtual docking lines (docking lines DL1 and DL2) that are the boundary lines between the building units 20 of each unit set X1 and X2 and the virtual building units as the base ends. This allows the open-ceiling space S1 to be expanded to the maximum extent possible in the building 10 in the direction in which the units are spaced apart.

[0055] In a configuration in which the stair section 50 is a curved staircase structure having a straight staircase section A1 and a curved staircase section A2, the longitudinal length of the staircase section 50 becomes relatively long, but as described above, the staircase section 50 is provided in the open-ceiling space S1 that is expanded in the direction in which the units are placed apart, so that the curved staircase structure staircase section 50 can be suitably installed.

[0056] In the building 10, by arranging a plurality of building units 20 in a row with their long sides facing each other, the building 10 can be constructed suitably even on a narrow lot. Furthermore, in a configuration in which the length dimension in the short side direction of the units in each unit set X1, X2 and the intermediate region R1 is the same, and the length dimension in the long direction of the staircase section 50 is made larger than the length dimension in the short side direction of the units in the intermediate region R1, in a modular building with a spaced-unit structure, the staircase section 50 can be properly installed in a state where it protrudes from the intermediate region R1 into the second unit set X2, regardless of the length dimension of the long sides of the building units 20, while still utilizing the basic structure of a modular building of the same size constructed without spaced-unit placement.

[0057] The present invention is not limited to the above-described embodiment, and may be implemented, for example, as follows.

[0058] In the above embodiment, the stair section 50 is configured to use a stair unit with a downward curved structure as shown in Figure 5, but this may be modified. For example, it is also possible to use a stair section with a straight stair section, a stair section with an upward curved structure in which a curved stair section is provided at the upper end of the straight stair section, or a stair section with a double curved structure in which a curved stair section is provided at both the lower and upper ends of the straight stair section. In any case, it is preferable that the stair section 50 has a structure that is long and rectangular in plan view.

[0059] In the above embodiment, the open-ceiling space S1 is configured to be located close to the exterior wall on the gable side of the building unit 20, with its length extending in the direction in which the units are placed apart (left and right in the drawing), but this may be changed. For example, the open-ceiling space S1 may be configured to be located away from the exterior wall on the gable side of the building unit 20.

[0060] In the above embodiment, a part of the intermediate area R1 between the unit sets X1 and X2 in the building 10 is defined as the open-ceiling space S1, but this may be changed so that the entire intermediate area R1 is defined as the open-ceiling space S1.

[0061] In the above embodiment, the intermediate area R1 in the building 10 is set as an area of ​​the same size as each of the unit sets X1 and X2, but this may be changed. For example, the dimension of the intermediate area R1 in the unit spacing direction may be smaller than the dimension of each of the unit sets X1 and X2 in the unit gable direction. Alternatively, the dimension of the intermediate area R1 in the unit spacing direction may be larger than the dimension of each of the unit sets X1 and X2 in the unit gable direction. [Explanation of symbols]

[0062] 10...building, 20...building unit, 20A...lower floor unit, 20B...upper floor unit, 50...staircase section, X1, X2...unit set, S1...open-air space.

Claims

1. A building comprising a plurality of building units formed by connecting beams and columns, and an upper floor and a lower floor adjacent to each other vertically, A first unit set and a second unit set are provided as a combination of an upper floor unit, which is the building unit on the upper floor side, and a lower floor unit, which is the building unit on the lower floor side, and the unit sets are spaced apart from each other across an intermediate area, and at least a portion of the intermediate area is an open-ceiling space spanning the lower floor and the upper floor, A staircase portion is provided in the atrium space, with the first unit set side on an upper side and the second unit set side on a lower side, and extending in a direction in which the unit sets are spaced apart, The atrium space is provided, in a plan view, between a floor end portion of a floor portion provided in the upper floor unit of the first unit set on the side of the intermediate region and a ceiling end portion of a ceiling portion provided in the lower floor unit of the second unit set on the side of the intermediate region, A building in which the staircase section is arranged so that its upper end is fixed to the floor end of the upper floor unit of the first unit set and its lower portion, including at least the first step from the bottom, is positioned on the floor portion of the lower floor unit of the second unit set.

2. The building of claim 1 , wherein an upper end of the staircase section is fixed to a floor structure of the upper unit of the first set of units.

3. The building described in claim 1, wherein, assuming that a virtual building unit is installed in the intermediate area, and when the boundary line between the building unit of each unit set and the virtual building unit is taken as a virtual docking line, the open-air space is between the virtual docking line on the first unit set side and the virtual docking line on the second unit set side.

4. A building as described in any one of claims 1 to 3, wherein the staircase section is elongated and rectangular in a plan view, and has a straight staircase section with a linear ascending and descending direction, and a curved staircase section is provided at least at either the lower or upper end of the straight staircase section, with the staircase entrance oriented in a direction that intersects with the ascending and descending direction of the straight staircase section.

5. The building unit has a rectangular parallelepiped shape having long sides and short sides in a plan view, and the building units are arranged in a row on the upper floor and the lower floor with the long sides facing each other, A building as described in any one of claims 1 to 3, wherein each unit set and the intermediate area have the same length dimension in the unit short side direction, and the length dimension in the long direction of the staircase section is greater than the length dimension in the unit short side direction of the intermediate area.

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