JP2017020208A - Unit type building structure - Google Patents

Abstract

A support for supporting an indoor side structure is suitably attached. A building unit is formed by connecting beams (ceiling beams, floor beams) and columns made of steel, and a unit type building is constructed using a plurality of building units. The web portion of the ceiling beam 22 is provided with a plurality of through-holes 22a for fixing the outer wall at predetermined intervals in the beam longitudinal direction, and the outer wall member is fixed using the through-holes 22a. The ceiling beam 22 is made of channel steel, and a bracket 37 for supporting the indoor side structure is fixed to the opening side of the channel portion of the channel steel so as to straddle the upper and lower flange portions, The bracket 37 is fixed at a position where it does not interfere with the through hole 22 a in the longitudinal direction of the ceiling beam 22. [Selection] Figure 5

Description

  The present invention relates to a structure of a unit type building.

  In a unit type building constructed by using a plurality of building units made of steel, channel steel is used as a beam (ceiling beam and floor beam) of the building unit. In addition, in a unit type building, when providing an atrium space from the lower floor to the upper floor, a technology for attaching a bracket (support) for supporting an indoor side structure provided in the atrium space to the groove opening side of the beam is known. It has been. Here, in the unit type building, it is regarded as important to increase the industrialization rate of building construction, and in a unit manufacturing factory for manufacturing a building unit, a bracket is fixed to a beam by welding.

  Further, for example, in Patent Document 1, as a reinforcing structure that can be easily realized at the time of renovation of a unit type building, a reinforcing member is arranged along the longitudinal direction of the beam on the opening side of the beam made of grooved steel. There has been proposed a technique for connecting a web of a beam and a reinforcing member using a bent plate-like connecting member and a fastening member (screw). With this technique, it is possible to easily attach the reinforcing member to the beam without performing a welding operation using a firearm.

JP 2011-208396 A

  However, in a unit type building, the outer wall member is fixed to the outer surface of the web of the beam (the ceiling beam and the floor beam) of the building unit as the outer wall structure. It is conceivable that the work of fixing the outer wall member becomes impossible or extremely difficult due to the attachment of the bracket and the reinforcing member to the opening side of the outer wall member.

  Further, as described in Patent Document 1, when the beam web and the reinforcing member are connected using a connecting member and a fastening member (screw), the reinforcing member is attached after the outer wall member is attached. Although it becomes possible, since the fixing method of the reinforcing member is a limited method using the connecting member and the fastening member, there is a concern that the working efficiency is lowered as compared with, for example, a welding operation. Moreover, there is a concern that the cost will increase.

  This invention is made | formed in view of the said situation, and makes it the main objective to provide the structure of the unit type building which can attach the support tool which supports an indoor side structure suitably.

  Hereinafter, means and the like effective for solving the above-described problems will be described while showing functions and effects as necessary. In the following, for ease of understanding, the reference numerals of the corresponding components in the embodiments of the invention are appropriately shown in parentheses, but are not limited to the specific configurations shown in parentheses.

1st invention is constructed | assembled using the building unit (20) formed by connecting the beam (22,23) and pillar (21) which consist of steel materials, and the longitudinal direction of the said beam is carried out to the web part of the said beam. A plurality of holes (22a) for fixing the outer wall are provided at predetermined intervals in the direction, and applied to the unit type building (10) to which the outer wall member (40) is fixed using the holes,
The beam is made of channel steel, and a support (37) for supporting the indoor side structure is fixed on the opening side of the channel of the channel steel so as to straddle the upper and lower flanges. And
The support is fixed at a position where it does not interfere with the hole in the longitudinal direction of the beam.

  Since the support that supports the indoor side structure is configured to be fixed at a position that does not interfere with the hole for fixing the wall in the longitudinal direction of the beam, the fixing work is hindered when the outer wall member is fixed to the beam. It can be suppressed. Further, since any fixing method including welding can be adopted for fixing the support tool, it is advantageous even in consideration of the work efficiency of the fixing. As a result, it is possible to suitably attach the support that supports the indoor side structure.

  According to a second aspect of the present invention, the length of the support in the longitudinal direction of the beam is smaller than the interval between the holes.

  Convenient configuration for avoiding positional interference between the hole for fixing the beam wall and the support by making the length of the support in the longitudinal direction of the beam smaller than the distance between the holes. Can be realized.

  According to a third aspect of the present invention, the outer wall member has a width dimension determined based on a module size of the unit type building, and a plurality of the outer wall members are arranged side by side in the building outer wall portion, and the outer wall members are The support is fixed at a reference position that can be a parting.

  When the outer wall member is fixed to the beam, the wall fixing position in the beam, that is, the position of the hole for fixing the wall is a position away from the parting (boundary portion) between the outer wall members. Therefore, by fixing the support tool at a reference position where the outer wall members can be closed, position interference between the beam wall fixing hole and the support tool can be suitably avoided.

  4th invention is a multi-story building, Comprising: It applies to the said unit type building which has the staircase structure part (17) which connects an upper floor part and a lower floor part as the said indoor side structure, The said upper floor part and the said A lower ground material (51) for fixing the tread board (18a) in the staircase structure portion is provided at a boundary portion of the lower floor portion in a direction extending in the vertical direction, and the support is configured by the indoor side structure. It is characterized by supporting the base surface material as an object.

  When a staircase structure part is provided in a unit type building, it may be necessary to fix the tread board to a part corresponding to the boundary part of the upper and lower floors in the atrium space that blows through on the upper and lower floors. Is supported by In such a case, by adopting the structure of the support as described above, a structure suitable for constructing the staircase structure part at the boundary between the upper and lower floors can be realized.

  According to a fifth aspect of the present invention, the beam is at least one of a ceiling beam (22) and a floor beam (23) of the building unit, and the staircase structure portion is inserted between the beams in the building unit. It has the said footboard arrange | positioned at a corner part, The said support tool is being fixed to each said large beam extended along two sides of the footboard arrange | positioned at the said corner part, It is characterized by the above-mentioned.

  In the staircase structure, the footboard may be supported at the corners of the large beams of the building unit. To increase the strength of the footboard, the footboard is supported by the large beams extending along the two sides of the footboard. Good. In this configuration, the staircase structure can be conveniently supported by fixing the support to the two large beams that support the footboard. In this case, even if the staircase structure is provided adjacent to the outer wall of the building, the outer wall member can be attached without hindrance.

  According to a sixth aspect of the present invention, the building unit includes a small beam (35a) that has at least one of a large beam of a ceiling (22) and a large floor beam (23) as the beam, and is attached in a direction orthogonal to the large beam. The staircase structure portion includes the step board disposed at a corner portion of the large beam and the small beam in the building unit, and along two sides of the foot plate disposed at the corner portion. The support is fixed to each of the large beam and the small beam that extend in the direction.

  In the staircase structure, the footboard may be supported at the corner of the building unit between the large beam and the small beam. To increase the supporting strength of the footboard, the large beam and the small beam extending along the two sides of the footboard may be used. The footboard should be supported. In such a configuration, the stair structure portion can be conveniently supported by fixing the support to the large beam and the small beam on the two sides that support the tread. In this case, even if the staircase structure is provided adjacent to the outer wall of the building, the outer wall member can be attached without hindrance.

  The seventh invention is characterized in that the step board disposed at the corner portion is a landing board for changing the direction of elevation.

  Since it is necessary to change the direction of the landing footboard when a person moves up and down, the size of the footboard in both the vertical and horizontal directions is larger than that of a footboard other than the landing. In this respect, a suitable support structure can be realized by adopting the above support structure.

Schematic which shows the structure of the vertical direction of a building. The perspective view which shows the structure of a building unit. Top view of stairs. The top view which shows the structure of the framework of a ceiling part about the building unit of the 1st floor part. (A) is a front view which shows the structure of a ceiling girder, (b) is a longitudinal cross-sectional view of a ceiling girder. AA line sectional view of Drawing 3. BB sectional drawing of FIG. The top view which shows the structure of the framework of a ceiling part about the building unit of the 1st floor part.

  Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. In the present embodiment, the present invention is embodied in a unit-type building having a steel frame ramen structure constructed using a plurality of building units. First, a unit building will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic view of the building 10, and FIG. 2 is a perspective view showing the configuration of the building unit 20.

  As shown in FIG. 1, a building 10 such as a house has a building main body 12 provided on a foundation 11, and a roof is provided on the building main body 12. The building body 12 has a first floor portion 14 as a lower floor portion and a second floor portion 15 as an upper floor portion, and the first floor portion 14 and the second floor portion 15 are adjacent to each other in the vertical direction. In the first floor portion 14, the floor surface is formed by the first floor 14a, and in the second floor portion 15, the floor surface is formed by the second floor 15a. Both the first floor portion 14 and the second floor portion 15 have a plurality of building units 20.

  The building 10 includes a staircase space 16 provided across the first floor portion 14 and the second floor portion 15 and a staircase 17 provided in the staircase space 16. The stair space 16 forms an atrium space from the lower floor to the upper floor. The staircase 17 has a plurality of footboards 18 and a plurality of kicking plates 19, and allows the first floor portion 14 and the second floor portion 15 to go back and forth.

  As shown in FIG. 2, the building unit 20 includes columns 21 arranged at four corners, a ceiling beam 22 connected to an upper end portion (upper end) of the column 21, and a lower end portion (lower end) of the column 21. The column 21, the ceiling beam 22 and the floor beam 23 form a rectangular parallelepiped skeleton (unit housing). The column 21 is made of a square tube-shaped square steel. Further, the ceiling beam 22 and the floor beam 23 are made of channel steel having a U-shaped cross section, and are arranged toward the inside of the unit so that the groove opening sides face each other.

  In the building unit 20, a plurality of ceiling beams 25 are bridged between the ceiling large beams 22 extending along the long side portion (girder surface) and facing each other at a predetermined interval. Similarly, a plurality of floor beams 26 are bridged at predetermined intervals between the large floor beams 23 that extend along the long side portion and face each other. The ceiling beam 25 and the floor beam 26 extend in parallel to the ceiling beam 22 and the floor beam 23 on the short side (wife side) at the same interval. The ceiling beam 25 and the floor beam 26 are made of, for example, square steel pipes. A ceiling member 28 is supported by the ceiling beam 25 and a floor member 29 is supported by the floor beam 26.

  FIG. 3 is a plan view of the staircase 17. The staircase 17 is a staircase in which the ascending / descending direction has a substantially square shape in plan view. In the stairs 17, a substantially square landing board 18 a is provided below the second floor 15 a, and the raising and lowering direction can be changed by 90 degrees on the landing board 18 a. In addition, step plates 18 for each step are provided at predetermined intervals below the landing plate 18a. The second floor 15a adjacent to the landing tread 18a in plan view is a passage floor 31 leading to the landing tread 18a. In FIG. 3, the passage floor 31 is indicated by dot hatching.

  The building 10 includes a peripheral wall portion 32 extending along the peripheral portion of the staircase space 16, and an intermediate wall portion 33 provided at a folded central portion of the staircase 17. The staircase 17 includes the wall portions 32. 33 are fixed in the building unit 20. In the present embodiment, the stairs 17 and the walls 32 and 33 correspond to the indoor side structure.

  Next, the support structure of the stairs 17 will be described by extracting the configuration of the boundary portion between the first floor portion 14 and the second floor portion 15 in particular. FIG. 4 is a plan view showing the structure of the framework of the ceiling portion of the building unit 20 of the first floor portion 14. In FIG. 4, the landing plate 18a and the passage floor 31 are virtually shown.

  As shown in FIG. 4, a plurality of small beams 35 for supporting the stairs 17 are fixed to a portion of the building unit 20 of the first floor portion 14 surrounded by the ceiling beams 22. The small beam 35 is perpendicular to the pair of ceiling large beams 22 on the long side and spans between the pair of large ceiling beams 22 and is provided between the two small beams 35a and 35b on the left and right sides of the figure. And a small beam 35c provided across the small beams 35a and 35b. Each beam 35 is made of channel steel having a U-shaped cross section, and is arranged such that the groove opening side faces the center of the unit. The grooved steel used as the small beam 35 has the same height as the ceiling beam 22 and the web portion, but the flange width is shorter than that of the ceiling beam 22.

  Each small beam 35 is arranged according to the dimension of the staircase 17. In other words, each small beam 35 is arranged so as to surround the staircase space 16 in a plan view. In this case, the four peripheral wall portions 32 are supported by the three small beams 35a to 35c and the remaining one ceiling large beam 22.

  In the present embodiment, the landing plate 18a of the staircase 17 is disposed at the corner of the ceiling large beam 22 and the small beam 35a in plan view, and the landing plate 18a and the passage floor 31 are arranged side by side along the small beam 35a. Is arranged in.

  Here, the landing tread 18a is located one step below the passage floor 31 that forms a part of the second floor 15a. In the height direction, near the boundary between the first floor unit and the second floor unit, that is, near the stacking line SL. It is in. In this case, it is necessary to fix the landing footplate 18a to the ceiling beam 22 and the small beam 35a, and the ceiling large beam 22 and the small beam 35a have a plurality of brackets 37, 38 as support members on the opening side of the grooved steel. And the landing plate 18a and the surrounding structural members are supported via the brackets 37 and 38. That is, in this embodiment, as shown in FIG. 4, the landing tread 18a is arranged at the corner of the ceiling large beam 22 and the small beam 35a, and the ceiling large beam 22 extending along the two sides of the landing tread 18a is small. Brackets 37 and 38 are fixed to the beam 35a, respectively.

  By the way, as shown in FIG. 5A, the web of the ceiling beam 22 is provided with a plurality of through holes 22a for fixing the outer wall at predetermined intervals in the longitudinal direction, and the outer wall member is formed using the through holes 22a. Is supposed to be fixed. In this case, the outer wall member is fixed by inserting a fastener such as a bolt into the through hole 22a, but the bracket 37 is provided on the opening side of the ceiling beam 22 at a position that matches the through hole 22a in the longitudinal direction of the ceiling beam 22. If it exists, it may be impossible or extremely difficult to fix the outer wall member. Therefore, in the present embodiment, the bracket 37 is arranged at a position that does not interfere with the through hole 22a of the ceiling beam 22.

  More specifically, as shown in FIG. 5 (b), the bracket 37 has bent portions 37 a at both upper and lower ends of a long metal plate, and the bent portions 37 a are located above and below the ceiling beam 22. Are fixed to the ceiling girder 22 by being welded to the front ends of the flanges. That is, the bracket 37 is fixed to the opening side of the ceiling beam 22 so as to straddle the upper and lower flange portions. In addition, the bracket 37 may be fixed by a technique other than welding, and may be fixed to the ceiling beam 22 by a fastener such as a screw.

  As shown in FIG. 5A, the brackets 37 are fixed at intervals D <b> 1 in the longitudinal direction of the ceiling beam 22. In the present embodiment, four brackets 37 are fixed to the ceiling beam 22 at intervals of 250 mm. The length of the bracket 37 in the beam longitudinal direction is smaller than the interval between the through holes 22a. Note that the four brackets 38 are fixed in the same manner in the small beam 35a.

  By the way, in the building 10, the module dimension by a meter module etc. is defined, and the outer wall member has the width dimension prescribed | regulated based on the module dimension. And when attaching a plurality of outer wall members side by side to the ceiling beam 22 and the floor beam 23, the mounting position (parting position) of the outer wall member is determined according to the module dimensions of the building 10, A through hole 22a is formed at a position corresponding to the mounting position of the outer wall member. More specifically, as shown in FIG. 5 (a), the through holes 22a are formed as a set with a predetermined distance D2 therebetween, one of which is a fixing hole for the left outer wall member and the other is the right side. This is a fixing hole for the outer wall member. In this case, the position of each L1 is a reference position that can be a parting between the outer wall members, and in this embodiment, the bracket 37 is fixed at a position that can be a parting between the outer wall members (L1 position).

  A specific accommodation for supporting the landing plate 18a will be described. 6 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 7 is a cross-sectional view taken along line BB in FIG. In addition, floor beams 26a and 26b are provided on the floor portion of the upper floor side building unit in a direction orthogonal to each other as a configuration for supporting the passage floor 31. Therefore, in FIGS. Cross sections of the floor beams 26a and 26b are shown respectively.

  As shown in FIG. 6, an outer wall panel 40 as an outer wall member is attached to the outer wall portion of the building 10. The outer wall panel 40 includes an outer wall surface material 41 and a base frame 42 fixed to the back surface thereof. The base frame 42 is formed by assembling light-weight shaped steel into a square frame shape. The outer wall panel 40 is attached to the building unit 20 by fixing the upper end portion and the lower end portion of the base frame 42 to the ceiling beam 22 and the floor beam 23 in the first floor portion 14 and the second floor portion 15, respectively.

  More specifically, the upper end portion of the base frame 42 is fixed to the ceiling cross beam 22 by bolts and nut fasteners 43 inserted into the through holes 22 a of the ceiling cross beam 22, and the lower end portion of the base frame 42 is fixed to the floor cross beam 23. It is fixed to the floor girder 23 by bolts and nut fasteners 44 inserted into the through holes 23a. A decorative body difference 45 is attached to a parting portion of the outer wall material 41 on the upper and lower floors.

  Further, as a configuration on the indoor side, a stair base material 51 is provided on the indoor side of the ceiling girder 22 on the first floor side and the floor girder 23 on the second floor side. Specifically, the stair base material 51 is a plate material having a larger vertical dimension than the lower end to the upper end of the first floor side ceiling beam 22 and the second floor side beam 23 arranged in the vertical direction. The bracket 37 is fixed to the bracket 37 by screws or the like, and is fixed to the joists 52 placed on the floor beam 23 by screws or the like. The stair base material 51 forms a wall base surface that is flush with the indoor side surfaces of the inner wall frames 53, 54 provided below the ceiling beam 22 and above the floor beam 23. An inner wall surface material 55 made of gypsum board or the like is fixed. Thereby, the peripheral wall part 32 is formed in the part along an outer wall.

  A stair support member 56 is fixed to the overlapping portion of the stair base material 51 and the inner wall material 55 from the side of the inner wall material 55 with screws or the like. In addition, tread board receiving members 57 and 58 are fixed on the stair support member 56, and the landing tread board 18a is supported by these tread board receiving members 57 and 58. The passage floor 31 is supported by the floor beam 26a of the building unit 20 on the upper floor side.

  Moreover, in FIG. 7, unlike the structure of FIG. 6, the beam 35a of the lower floor side building unit and the floor beam 26b of the upper floor side building unit are arranged side by side. A stair base material 61 is fixed to the floor beam 26b. Specifically, the stair base material 61 is a plate material similar to the stair base material 51 shown in FIG. 6 and is fixed to the bracket 38 provided on the opening side of the small beam 35a by screws or the like. It is fixed with screws or the like to the floor beam 26b on the upper floor side. An inner wall surface material 62 made of gypsum board or the like is fixed to the stair base material 61, thereby forming a part of the peripheral wall portion 32.

  A stair support member 63 is fixed to the overlapping portion of the stair base material 61 and the inner wall material 62 from the inner wall material 62 side with screws or the like. Further, tread board receiving members 64 and 65 are fixed on the stair support member 63, and the landing foot board 18a is supported by these tread board receiving members 64 and 65.

  As shown in FIGS. 6 and 7, the landing plate 18a is supported so that the landing plate 18a located near the boundary between the upper and lower floors is firmly held in a stable state from two directions on the wall side. Yes.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  Since the bracket 37 for supporting the staircase 17 and its peripheral members is fixed at a position that does not interfere with the through hole 22 a for fixing the wall in the longitudinal direction of the ceiling beam 22, the outer wall member is fixed to the ceiling beam 22. In doing so, it is possible to prevent the fixing operation from being hindered. Further, since any fixing method including welding can be adopted for fixing the bracket 37, it is advantageous even in consideration of the work efficiency of the fixing. As a result, the bracket 37 can be suitably attached to the ceiling beam 22.

  The length of the bracket 37 in the beam longitudinal direction is set to be smaller than the interval between the through holes 22a. Thereby, in avoiding the positional interference between the through hole 22a of the ceiling beam 22 and the bracket 37, an advantageous configuration can be realized.

  When a plurality of outer wall members are fixed to the ceiling beam 22, the wall fixing position in the ceiling beam 22, that is, the position of the through hole 22 a for fixing the wall is a position away from the parting (boundary portion) between the outer wall members. . Focusing on this point, the bracket 37 is fixed at a reference position that can be used as a parting between the outer wall members, so that position interference between the wall fixing through hole 22a and the bracket 37 can be preferably avoided.

  At the boundary between the upper and lower floors of the building 10, the stair base materials 51 and 61 for fixing the landing plate 18a are supported by the brackets 37 and 38 provided on the ceiling beam 22 and the small beam 35a. In such a case, a configuration suitable for constructing the staircase 17 at the boundary between the upper and lower floors can be realized by adopting the configuration of the brackets 37 and 38 as described above.

  In the structure in which the landing plate 18a of the staircase 17 is provided at the corner of the ceiling beam 22 and the small beam 35a, brackets 37 and 38 are provided on the ceiling beam 22 and the small beam 35a extending along two sides of the landing plate 18a. The landing plate 18a is supported by the ceiling beams 22 and the beams 35a. Therefore, the support strength of the landing footboard 18a can be increased, and the stairs 17 can be supported conveniently.

  Since it is necessary to change the direction of the landing footboard 18a when a person moves up and down, the footboard dimensions in the vertical and horizontal directions are larger than those of the footboard 18 other than the landing. In this respect, a suitable support structure can be realized by adopting the above support structure.

[Other Embodiments]
The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  In the above embodiment, as shown in FIG. 4, the landing plate 18 a of the staircase 17 is arranged at the corner of the ceiling beam 22 and the small beam 35 a, but instead of this, as shown in FIG. 8. Thus, it is good also as a structure which arrange | positions the landing tread 18a in the corner part of the ceiling beams 22 between. In this case, the bracket 37 is fixed to each ceiling beam 22 extending along two sides of the landing plate 18a, and the landing plate 18a is supported by each ceiling beam 22. As a result, the support strength of the landing plate 18a can also be increased, and the stairs 17 can be conveniently supported.

  In the above embodiment, the bracket 37 as a support is fixed to the ceiling beam 22 of the building unit 20, but instead, the bracket 37 is fixed to the floor beam 23, or the ceiling beam 22 and the floor. The structure which fixes the bracket 37 to the big beam 23 may be sufficient.

  In the stairs 17, the structure which supports the another footboard 18 which is not the landing footboard 18a with the brackets 37 and 38 may be sufficient.

  -In a multi-story building having an atrium space (other than the staircase), an inner wall of the atrium space may be provided as an indoor structure, and the inner wall may be supported by a bracket as a support.

  DESCRIPTION OF SYMBOLS 10 ... Building, 17 ... Stairs (indoor structure), 18a ... Landing step board, 20 ... Building unit, 21 ... Pillar, 22 ... Ceiling girder, 22a ... Through-hole, 23 ... Floor girder, 37 ... Bracket (support) 38 ... Bracket (support), 40 ... Outer wall panel (outer wall member), 51 ... Stair base material.

Claims (7)

It is constructed using a building unit formed by connecting beams and columns made of steel, and the web portion of the beam has a plurality of holes for fixing the outer wall at predetermined intervals in the longitudinal direction of the beam. And is applied to a unit type building to which an outer wall member is fixed using the hole,
The beam is made of channel steel, and on the opening side of the channel of the channel steel, a support for supporting the indoor side structure is fixed so as to straddle the upper and lower flanges,
The structure of a unit type building, wherein the support is fixed at a position that does not interfere with the hole in the longitudinal direction of the beam.   2. The unit building structure according to claim 1, wherein the support has a length in the longitudinal direction of the beam smaller than an interval between the holes. The outer wall member has a width dimension determined based on a module dimension of the unit type building,
A plurality of the outer wall members are arranged side by side in the building outer wall,
The structure of the unit type building according to claim 1 or 2, wherein the support is fixed at a reference position where the outer wall members can be closed. It is a multi-story building, and is applied to the unit type building having a staircase structure part connecting the upper floor part and the lower floor part as the indoor side structure,
At the boundary between the upper floor part and the lower floor part, a lower ground material for fixing a footboard in the staircase structure part is provided in a direction extending in the vertical direction,
The structure of the unit type building according to any one of claims 1 to 3, wherein the support tool supports the base surface material as the indoor side structure. The beam is at least one of a ceiling beam and a floor beam of the building unit,
The staircase structure portion includes the tread plate disposed in a corner portion between the large beams in the building unit,
The structure of the unit type building according to claim 4, wherein the support is fixed to each of the large beams extending along two sides of the tread board disposed in the corner portion. The building unit has at least one of a ceiling large beam and a floor large beam as the beam, and has a small beam attached in a direction orthogonal to the large beam,
The staircase structure portion includes the tread plate disposed at a corner portion of the large beam and the small beam in the building unit,
The structure of the unit type building according to claim 4, wherein the support is fixed to each of the large beam and the small beam extending along two sides of the tread plate disposed in the corner portion. .   The structure of the unit type building according to claim 5 or 6, wherein the tread board arranged at the corner portion is a landing tread board for changing the direction of elevation.

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