JP7150532B2 - Staircase structure and unit building - Google Patents

Description

TECHNICAL FIELD The present invention relates to a staircase structure and a unit building in which an iron staircase is adjacent to a parting wall.

Conventionally, a steel staircase structure is known (see Patent Document 1, for example). Patent Literature 1 discloses a structure in which a staircase portion made of iron construction members is fixed to a wall.

JP-A-5-311835

However, the staircase structure described in Patent Document 1 is a structure in which the staircase portion is fixed to the wall using bolts and nuts that pass through the wall. Therefore, in the staircase structure described in Patent Document 1, there is a problem that the staircase cannot be fixed to the parting wall.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a staircase structure and a unit building in which iron stairs can be fixed to a parting wall.

In order to achieve the above object, the staircase structure of the present invention is a staircase structure in which an iron stairway is adjacent to a wall of a fireproof structure, and the walls of the fireproof structure are each provided with two layers of fireproof boards. and a fireproof board, a noncombustible frame member and a noncombustible horizontal member that spans across the frame member, and the stairs are fixed to the horizontal member of the wall of the fireproof structure characterized by being

Here, in the stair structure of the present invention, the stair may be fixed to the horizontal member by dry connection.

Further, in the staircase structure of the present invention, the stairs may include a tread and a tie plate, and the tread plate may be fixed to the horizontal member via the tie plate.

Moreover, in the staircase structure of the present invention, the staircase forming one floor may be formed from a plurality of sub-staircase units. Furthermore, the unit building of the present invention may comprise the stair structure described above.

In the staircase structure of the present invention constructed in this way, the iron stairs are adjacent to the wall of the fire-resistant structure, and the walls of the fire-resistant structure are each provided with two layers of fire-resistant boards and fire-resistant boards. and a noncombustible frame member and a noncombustible horizontal member that spans across the frame member, and the stairs are fixed to the horizontal member of the wall of the fireproof structure . Therefore, the stairs can be attached to the cross members of the fire-resistant wall without penetrating the fire-resistant wall.

In addition, in the staircase structure of the present invention, the staircase is fixed to the horizontal member by dry connection, so that the weight can be reduced as compared with the case of welding.

Further, in the staircase structure of the present invention, the staircase includes the treads and the treads, and the treads are fixed to the horizontal members via the treads, thereby reducing the weight compared to the case of welding. be able to.

In addition, in the staircase structure of the present invention, the staircase that constitutes one story is formed from a plurality of sub-staircase units, so that the sub-staircase units divided into smaller sizes can be attached to the parting wall. Mounting workability can be improved.

Since it is the above-mentioned structure, it can be set as the unit building which shows the effect of the above-mentioned staircase structure of this invention.

1 is a configuration diagram showing the configuration of a unit building of Example 1. FIG. FIG. 2 is an explanatory diagram for explaining the configuration of the unit building of Example 1; 1 is an exploded perspective view showing the configuration of a unit building of Example 1. FIG. FIG. 3 is a perspective view showing the configuration of the building unit on the lowest floor of Example 1; FIG. 3 is a perspective view showing the configuration of the building unit on the upper floor of Embodiment 1; 2 is a perspective view showing the configuration of the building unit on the top floor of Example 1. FIG. 2 is a perspective view showing the configuration of the stair unit of Example 1. FIG. 4 is a plan view showing the configuration of the stair unit of Example 1. FIG. 4 is a perspective view showing the configuration of the boundary wall of Example 1. FIG. 4 is a cross-sectional view showing the configuration of a boundary wall of Example 1. FIG. FIG. 4 is a cross-sectional view showing the mounting structure of the staircase of Example 1 to the central wall. FIG. 4 is a cross-sectional view showing the mounting structure of the stairs to the partition wall of the first embodiment; FIG. 4 is a cross-sectional view showing the mounting structure of the stairs to the partition wall of the first embodiment; 14(a) is a perspective view showing the configuration of the jig of the stair unit of Example 1, FIG. 14(a) shows the first sub stair unit, FIG. 14(b) shows the second sub stair unit, and FIG. c) shows the third sub-stair unit. 4 is a cross-sectional view showing the configuration of the jig of the staircase unit of Example 1. FIG. FIG. 4 is an explanatory diagram for explaining the procedure for assembling the unit building of Example 1; FIG. 4 is an explanatory diagram for explaining the procedure for assembling the unit building of Example 1; FIG. 4 is an explanatory diagram for explaining the procedure for assembling the unit building of Example 1; FIG. 4 is an explanatory diagram for explaining the procedure for assembling the unit building of Example 1;

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which implement|achieves the staircase structure and unit building by this indication is described based on Example 1 shown on drawing.

First, the configuration will be explained. The staircase structure and unit building in Example 1 are applied to a unit building of an apartment complex having a staircase structure connecting the floors of each floor of a three-story building consisting of the bottom floor, the upper floor and the top floor.

[Unit building configuration]
FIG. 1 is a configuration diagram showing the configuration of a unit building of Example 1. FIG. FIG. 2 is an explanatory diagram illustrating the configuration of the unit building of Example 1. FIG. 3 is an exploded perspective view showing the configuration of the unit building of Example 1. FIG. The configuration of the unit building of Example 1 will be described below with reference to FIGS. 1 to 3. FIG.

In the unit building 1, as shown in FIG. The building unit 210 on the top floor is installed on the building unit 110 on the top floor. A roof panel 3 is arranged above the building unit 210 on the top floor.

As shown in FIGS. 1 and 2, the unit building 1 includes a first dwelling unit H1 where a certain household lives, a second dwelling unit H2 where another household lives, a third dwelling unit H3 where another household lives, This is an apartment complex consisting of a fourth dwelling unit H4 in which another household lives.

As shown in FIG. 3, the lowest floor stair unit 50 is arranged inside the lowest floor building unit 10, and the upper floor stair unit 50 is arranged inside the upper floor building unit 110. be.

[Configuration of building unit]
FIG. 4 is a perspective view showing the configuration of the lowest floor building unit of the first embodiment. FIG. 5 is a perspective view showing the configuration of the upper floor building unit of the first embodiment. FIG. 6 is a perspective view showing the configuration of the building unit on the top floor of the first embodiment. The configuration of the building unit of the first embodiment will be described below with reference to FIGS. 4 to 6. FIG. In order to simplify the explanation, the explanation of the outer wall is omitted.

The building unit 10 on the bottom floor, the building unit 110 on the top floor, and the building unit 210 on the top floor all have columns 11 made of four rectangular steel pipes, and the lower ends of these columns 11 are connected. It comprises a frame structure having four channel steel floor girders 12 and four channel steel ceiling girders 13 connected between the upper ends of these columns 11 .

(bottom floor building unit)
As shown in FIG. 4, a plurality of small floor girders 14 made of square steel pipes are spanned substantially in parallel at substantially equal intervals between the floor girders 12 on the opposite long side of the building unit 10 on the lowest floor. A floor plate 15 is attached on these floor beams 14 . The upper surface of the floor board 15 constitutes a floor. The load of the floor plate 15 and the load applied to the floor plate 15 are transmitted to the foundation 2 from the small floor beams 14 and the large floor beams 12 .

A plurality of ceiling girders 16 made of channel steel are spanned substantially parallel between the ceiling girders 13 on the opposite long sides of the building unit 10 on the lowest floor. A ceiling plate 17 is attached to the lower surface of these ceiling beams 16 . The ceiling plate 17 of the building unit 10 on the lowest floor is opened so as to have an atrium space above the stairs.

In the building unit 10 on the lowest floor, the ceiling girders 16 are not provided inside the ceiling girders 13 and at the position where the stair unit 50 on the lowest floor is installed, and the second floor made of channel steel is installed. A first ceiling auxiliary beam 21 and a second ceiling auxiliary beam 22 made of channel steel are provided.

(upper floor building unit)
As shown in FIG. 5, a plurality of small floor girders 14 made of rectangular steel pipes are spanned substantially parallel to each other at substantially equal intervals between the floor girders 12 on the opposite long sides of the building unit 110 on the upper floor. A floor plate 115 is attached on these floor beams 14 . The upper surface of the floor board 115 constitutes a floor. The floor board 115 of the building unit 110 on the upper floor is opened so as to have an atrium space above the stairs. The load of the floor plate 115 and the load applied to the floor plate 115 are transmitted to the foundation 2 from the small floor beams 14 and the large floor beams 12 via the columns 11 on the lower floor.

A plurality of ceiling girders 16 made of channel steel are spanned substantially parallel between the ceiling girders 13 on the opposite long sides of the building unit 110 on the upper floor. A ceiling plate 17 is attached to the lower surface of these ceiling beams 16 . The ceiling plate 17 of the building unit 110 on the upper floor opens so as to have an atrium space above the stairs.

In the upper floor building unit 110, the floor girders 14 are not provided inside the floor girders 12 and at the position where the upper floor stair unit 50 is installed. A beam 31 and a second floor auxiliary beam 32 made of square steel pipe are provided.

In the upper-floor building unit 110, no ceiling girders 16 are provided inside the ceiling girders 13 and at positions where the upper-floor staircase units 50 are to be installed. Similarly, a first auxiliary ceiling beam 21 and a second auxiliary ceiling beam 22 made of channel steel are provided.

(top floor building unit)
As shown in FIG. 6, a plurality of small floor girders 14 made of square steel pipes are spanned substantially parallel to each other at substantially equal intervals between the floor girders 12 on the opposite long sides of the building unit 210 on the top floor. A floor plate 115 is attached on these floor beams 14 . The upper surface of the floor board 115 constitutes a floor. The floor board 115 of the building unit 210 on the top floor is opened so as to have an atrium space above the stairs. The load of the floor plate 115 and the load applied to the floor plate 115 are transmitted to the foundation 2 from the small floor beams 14 and the large floor beams 12 via the pillars 11 on the upper floor and the pillars 11 on the lowest floor.

A plurality of ceiling girders 16 made of channel steel are spanned substantially parallel between the ceiling girders 13 on the opposite long sides of the building unit 210 on the top floor. A ceiling plate 117 is attached to the lower surface of these ceiling beams 16 .

In the building unit 210 on the top floor, the floor girders 14 are not provided inside the floor girders 12 and at the position where the stair unit 50 on the upper floor is to be installed, which is the same as the building unit 110 on the upper floor. , a first floor auxiliary beam 31 and a second floor auxiliary beam 32 made of square steel pipes are provided.

[Composition of the stair unit]
FIG. 7 is a perspective view showing the configuration of the stair unit of Example 1. FIG. FIG. 8 is a plan view showing the configuration of the stair unit of Example 1. FIG. FIG. 9 is a perspective view showing the configuration of the boundary wall of Example 1. FIG. 10 is a cross-sectional view showing the configuration of the boundary wall of Example 1. FIG. FIG. 11 is a cross-sectional view showing the mounting structure of the stairs to the central wall of the first embodiment. FIG. 12 is a cross-sectional view showing a structure for attaching a staircase to a parting wall according to the first embodiment. The configuration of the staircase unit of Example 1 will be described below with reference to FIGS. 7 to 12. FIG. Since the stair unit on the lowest floor and the stair unit on the upper floor have the same configuration, the stair unit on the lowest floor will be explained, and the explanation on the stair unit on the upper floor will be omitted.

As shown in FIGS. 7 and 8, the stair unit 50 includes a central wall 60 arranged in the center of the stair unit 50, a winding staircase 51 installed so as to surround the outside of the central wall 60, and a winding staircase 51. It is composed of a boundary wall 70 and a partition wall 80 installed on the outer periphery.

(Composition of central wall)
The central wall 60 is formed in a rectangular panel shape by attaching two wall members 62 made of gypsum boards or the like to a frame member 61 made of channel steel formed in a frame shape. Inside the frame member 61 , there are a plurality of inner support members 63 made of channel steel that support the winding staircase 51 .

(Structure of winding stairs)
The round staircase 51 is composed of a plurality of treads 52 , a plurality of risers 53 , and a plurality of strips 55 as support means arranged at both ends of the riser 53 .

The tread plate 52 is formed of a plate material, and a back plate 52a made of iron is attached to the back surface thereof. The riser 53 is made of iron plate material. The riser 53 is attached to the footboard 52 with a mounting bracket such as a nail.

Each support plate 55 is made of an iron plate material, and as shown in FIGS. 7 and 15, has a rectangular shape comprising a base portion 55a and projecting portions 55b extending from both ends of the base portion 55a in a direction perpendicular to the base portion 55a. It is formed in a U shape (cono shape). The support plates 55 are arranged at both ends in the width direction of the footboard 52 and support the footboard 52 from below.

As shown in FIG. 8, the circular staircase 51 is formed in a G shape by turning 270 degrees so as to surround the outside of the central wall 60, and is configured to allow access from the lowest floor to the upper floor. be done.

The end portion of the winding staircase 51 on the inner peripheral side in the width direction is supported by the central wall 60 via a tie plate 55 . The end portion of the winding staircase 51 on the outer peripheral side in the width direction is supported by the boundary wall 70 via the support plate 55 .

(Structure of parting wall)
A parting wall is a technical term that generally means "a wall that separates each dwelling unit such as a tenement house, a row house, an apartment house" (Architectural Dictionary, 2nd Edition). In this embodiment, a wall of a fire-resistant structure exhibiting high fire resistance equivalent to that of the above-described partition wall is referred to as a partition wall to distinguish it from an ordinary partition wall. A wall of fireproof structure equivalent to this parting wall (parting wall in this embodiment) is installed between adjacent building units in a unit building to separate the building units. As shown in FIGS. 9 and 10, the partition wall 70 is composed of a frame member 71 formed in a frame shape, a horizontal member 72 horizontally spanning the frame member 71, and a fireproof board attached to the frame member 71. A fireproof structure comprising a gypsum board 73 and a heat insulating material 75 is used. A plurality of boundary walls 70 are installed so as to surround the outer circumference of the winding staircase 51 .

The frame member 71 is made of channel steel and formed into a substantially rectangular frame shape when viewed from the front. The horizontal member 72 is made of channel steel and is horizontally spanned on the frame member 71 . The horizontal members 72 are provided corresponding to the positions where the footboards 52 and the risers 53 are attached.

Two gypsum boards 73 are provided on the frame member 71 . In addition, when the parting wall 70 is provided between the building units, the gypsum board 73 is provided on the frame member 71 on the indoor side of the parting wall 70 . The heat insulating material 75 is glass wool, for example, and is provided between the gypsum boards 73 . That is, two gypsum boards 73 are provided on both sides of the partition wall 70 .

(Configuration of partition wall)
As shown in FIG. 13, the partition wall 80 is formed in the shape of a rectangular panel by attaching a wall member 82 made of a sheet of gypsum board or the like to a frame member 81 made of channel steel formed in a frame shape. be. Inside the frame member 81 , there are a plurality of cross members 83 made of channel steel that support the round staircase 51 .

(Mounting structure to the central wall of the round staircase)
The treads 52 of the circular staircase 51 are attached to the central wall 60 by means of dry connections via strips 55, as shown in FIG. The footboard 52 is placed on the projecting portion 55 b of the support plate 55 . The footboard 52 placed on the projecting portion 55b is fixed at a plurality of locations with screws S. As shown in FIG. The base 55a of the tie plate 55 is fixed to the inner support member 63 with a plurality of screws S via the wall material 62 of the central wall 60. As shown in FIG. That is, the tread 52 is attached to the tie plate 55 by a dry connection. Also. The tie plate 55 is fixed to the central wall 60 by a dry connection.

(Mounting structure to the parting wall of the round staircase)
As shown in FIG. 12, the treads 52 of the winding staircase 51 are attached to the horizontal members 72 of the parting wall 70 via the strips 55 by dry connection. The footboard 52 is placed on the projecting portion 55 b of the tie plate 55 . The footboard 52 placed on the projecting portion 55b is fixed by a plurality of screws S. As shown in FIG.

The base portion 55a of the tie plate 55 is fixed to the horizontal member 72 with a plurality of screws S via the gypsum board 73 of the partition wall 70 . That is, the tie plate 55 is fixed to the boundary wall 70 by dry connection. Thereby, the tie plate 55 is attached to the boundary wall 70 without penetrating the boundary wall 70 and supports the outer peripheral side of the winding staircase 51 .

(Mounting structure to the partition wall of the circular staircase)
As shown in FIG. 13, the treads 52 of the circular staircase 51 are attached to the horizontal members 83 of the partition walls 80 through the strips 55 by dry connection. The tread plate 52 is fixed to the tie plate 55 with a plurality of screws S. The base portion 55a of the tie plate 55 is fixed to the horizontal member 83 via the wall member 82 of the partition wall 80 with a plurality of screws S.

The parting wall 70 and the partition wall 80 of the building unit 10 on the lowest floor are placed on the floor board 15 of the building unit 10 on the lowest floor. That is, the parting wall 70 and the partition wall 80 are supported by the floor board 15 of the floor on which the parting wall 70 and the partition wall 80 are arranged.

[Construction of Jig for Stair Unit]
14A and 14B are perspective views showing the configuration of the jig of the stair unit of Example 1, FIG. 14(a) showing the first sub-stair unit, and FIG. 14(b) showing the second sub-stair unit. , FIG. 14(c) shows a third sub-stair unit. FIG. 15 is a cross-sectional view showing the configuration of the jig of the stair unit of Example 1. FIG. The configuration of the jig of the staircase unit of Example 1 will be described below with reference to FIGS. 14 and 15. FIG. Since the jig for the stair unit 50 on the lowest floor and the jig for the stair unit 50 on the upper floor have the same configuration, the jig for the stair unit 50 on the lowest floor will be explained, and the jig for the stair unit 50 on the upper floor will be explained. A description of the jig is omitted.

The jig 85 is used in the process of attaching the tread 52 , the riser 53 and the tie plate 55 to the boundary wall 70 .

The jig 85 has a first jig 85a, a second jig 85b, and a third jig 85c. As shown in FIG. 14(a), the first jig 85a supports three treads 52, three risers 53, and two outer peripheral side strips 55 to form a first sub-stair unit. This constitutes the sub-stair unit 50a. As shown in FIG. 14(b), the second jig 85b supports two treads 52, two risers 53, and one tie plate 55 on the outer peripheral side to form a second sub-stair unit. This constitutes the sub-stair unit 50b. As shown in FIG. 14(c), the third jig 85c supports the two outer peripheral side strips 55 to form a third sub-stair unit 50c.

The jig 85 is formed of a plurality of square steel pipes, as shown in FIG. The jig 85 supports the projecting portion 55b on the lower side of the tie plate 55 from below.

A plurality of mounting holes 86 are formed in the upper surface of the jig 85 that contacts the projecting portion 55 b on the lower side of the tie plate 55 . A plurality of mounting holes 55c corresponding to the mounting holes 86 of the jig 85 are formed in the projecting portion 55b on the lower side of the tie plate 55. As shown in FIG.

The tie plate 55 is temporarily fixed to the jig 85 by inserting the bolt B into the attachment hole 86 of the jig 85 through the attachment hole 55 c of the tie plate 55 . The attachment hole 55c of the tie plate 55 and the attachment hole 86 of the jig 85 are formed to be sufficiently larger in diameter than the bolt B so that the attachment hole 55c of the tie plate 55 and the attachment hole 86 of the jig 85 can be attached and detached. Thereby, the operator can easily remove the jig 85 from the stair unit 50 .

[Assembly procedure of unit building]
16 to 19 are explanatory diagrams explaining the assembly procedure of the unit building of the first embodiment. The procedure for assembling the unit building of Example 1 will now be described with reference to FIGS. 16 to 19. FIG.

(Wall mounting process)
In the wall mounting process, as shown in FIG. 16, one parting wall 70 and one partitioning wall 80 are mounted on the building unit 10 on the lowest floor.

(Sub-stair unit installation process)
In the sub-stair unit installation step, as shown in FIG. 17, a first sub-stair unit 50a, a second sub-stair unit 50b, and a third sub-stair unit 50c are installed in the building unit 10 on the lowest floor. . At this time, the strips 55 provided in the first sub-stair unit 50a, the second sub-stair unit 50b, and the third sub-stair unit 50c are attached to the boundary wall 70 with screws S. Further, in the sub-stair unit installation process, a plurality of other strips 55 are attached to the boundary wall 70 with screws S. As shown in FIG.

(Central wall mounting process)
In the central wall mounting process, as shown in FIG. 18, the central wall 60 is installed in the building unit 10 on the lowest floor. In addition, in the central wall mounting process, the plurality of footboards 52 and the risers 53 are placed on the support plate 55 attached to the boundary wall 70 and fixed with screws S. As shown in FIG.

(Jig removal process)
In the jig removing process, as shown in FIG. 19, the first jig 85a, the second jig 85b, and the third jig 85c are removed from the building unit 10 on the lowest floor. Then, in the jig removing process, the remaining parting wall 70 is attached to the lowest building unit 10 .

Similarly, the upper floor building unit 110 is assembled through a wall mounting process, a sub-stair unit installation process, a central wall mounting process, and a jig removing process.

(Building unit installation process)
In the building unit installation process, the lowest floor building unit 10 is installed on the foundation 2, as shown in FIG. A building unit 110 on the upper floor is installed on the building unit 10 on the lowest floor. The building unit 210 on the top floor is installed on the building unit 110 on the upper floor.
A roof panel 3 is installed on top of the building unit 210 on the top floor.

In this way, the unit building 1 is assembled through the wall mounting process, the sub-stair unit installation process, the central wall mounting process, the jig removal process, and the building unit installation process.

Next, the operation of the staircase structure and the unit building of Example 1 will be described. The staircase structure of Example 1 is a staircase structure in which an iron staircase (circumferential staircase 51 ) is adjacent to the parting wall 70 . In this staircase structure, the parting wall 70 is composed of a noncombustible frame material 71 and a noncombustible material laterally across the frame material 71 between fireproof boards (gypsum boards 73) and fireproof boards (gypsum boards 73). A staircase (circumferential staircase 51) is fixed to the horizontal member 72 (FIG. 8).

As a result, the stairs (circumferential stairs 51 ) can be attached to the horizontal member 72 of the partition wall 70 without penetrating the partition wall 70 . Therefore, the stairs (circumferential stairs 51) can be attached to the parting wall 70 while maintaining the fire resistance and sound insulation of the parting wall 70. - 特許庁Moreover, since the stairs (circumferential stairs 51) can be attached to the parting wall 70, flexible design can be accommodated. Further, since the iron staircase (circumferential staircase 51) is attached to the noncombustible horizontal member 72 attached to the noncombustible frame member 71, the fire resistance can be improved. Therefore, it is possible to secure an evacuation route in the event of a fire.

In the stair structure of Example 1, the stair is fixed to the transverse members by dry joints (Fig. 12).

As a result, the staircase (circumferential staircase 51) can be fixed to the horizontal member 72 by dry connection. Therefore, the weight can be reduced as compared with the case of welding. In addition, the stairs (circumferential stairs 51) can be attached to the parting wall 70 without time-consuming welding work. Therefore, the construction time can be shortened and the cost can be reduced.

In the staircase structure of Example 1, the stair comprises a tread 52 and a tie plate 55 , and the tread plate 52 is fixed to the horizontal members 72 via the tie plate 55 ( FIG. 12 ).

As a result, the staircase (circumferential staircase 51) can be fixed to the horizontal member 72 by dry connection. Therefore, the weight can be reduced as compared with the case of welding.

In the staircase structure of Example 1, the staircase (circumferential staircase 51) that constitutes one floor is composed of a plurality of sub-staircase units (first sub-staircase unit 50a, second sub-staircase unit 50b, third sub-staircase unit 50c). formed (FIG. 14).

As a result, sub-stair units (first sub-stair unit 50a, second sub-stair unit 50b, third sub-stair unit 50c) divided into smaller sizes can be attached to the boundary wall 70. FIG. Therefore, attachment workability can be improved. In particular, when the staircase (circumferential staircase 51) is fixed to the boundary wall 70 by dry connection, the mounting workability is improved.

The unit building 1 of Example 1 has the above-described staircase structure (FIGS. 1 and 2). This makes it possible to design a unit building with a degree of freedom corresponding to, for example, an apartment complex.

The staircase structure and unit building of the present disclosure have been described above based on the first embodiment. However, the specific configuration is not limited to this embodiment, and design changes, additions, and the like are permitted as long as they do not depart from the gist of the invention according to each claim.

In Example 1, an example was shown in which the outer peripheral wall of the winding staircase was used as the parting wall. However, part of the outer peripheral wall may be used as the boundary wall. That is, at least a part of the winding staircase should be adjacent to the parting wall.

In Example 1, an example was shown in which the staircase is a circular staircase. However, the staircase may be a straight staircase, a turnaround staircase, a bent staircase, or the like.

Example 1 shows an example in which the present invention is applied to a three-story unit building. However, the present invention can be applied to two-story buildings and buildings of four or more stories.

In Example 1, an example of applying the present invention to a unit building was shown. However, the present invention is also applicable to general steel-framed buildings, conventionally constructed buildings, and two-by-four buildings.

1 Unit building 50a First sub-stair unit (an example of sub-stair unit)
50b Second sub-stair unit (an example of sub-stair unit)
50c Third sub-stair unit (an example of sub-stair unit)
51 Round stairs (an example of stairs)
52 Footboard 55 Sasara board 70 Parting wall 71 Frame member 72 Horizontal member 73 Gypsum board (an example of fireproof board)

Claims (5)

A staircase structure in which the steel staircase is adjacent to a wall of fire-resistant construction ,
The wall of the fire-resistant structure includes a frame member made of a non-combustible material and a horizontal member made of a non-combustible material that spans across the frame member between the fire-resistant boards that are provided in two layers. prepared,
A staircase structure, characterized in that said staircase is fixed to said cross member of said wall of fire-resistant structure. The staircase structure according to claim 1, characterized in that the staircase is fixed to the cross member by dry connection. The stair comprises a tread and a board,
3. The staircase structure according to claim 2, wherein the treads are fixed to the horizontal members via the straps. The staircase structure according to any one of claims 1 to 3, characterized in that the staircase constituting one floor is formed from a plurality of sub-staircase units. A unit building comprising the staircase structure according to any one of claims 1 to 4.

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