JP7193081B2 - stair structure - Google Patents

Description

The present invention relates to a stair structure.

Patent Literature 1 describes a folding staircase that connects the first and second floors of a building. This folding staircase has a structure in which the straight part on the first floor side and the straight part on the second floor side are connected by a curved part. In addition, the surrounding part of this turn-back staircase is formed by bending a sheet of metal plate to form two treads (treads) and a riser (racket) that connects the two treads. , the metal plate is placed on a force girder (stringer) and supported from below.

By the way, in the folding staircase disclosed in the prior art document, the force girder for supporting the straight part and the turning part of the staircase is integrally formed. Concretely, the stairs are arranged on the straight part and the circumference part on the first floor side by a pair of stringers that are spanned between the support frame erected on the foundation concrete of the first floor and the middle of the wall frame. A member is supported. The pair of stringers has an inclined portion that is inclined obliquely upward from the first floor side, and the inclined portion is horizontally bent from the upper end to the tip. In addition, a girder bridge is provided between the tip end portions of the pair of stringers and the bent portion. A staircase member that serves as a tread plate for the straight portion is fixed to the inclined portion, and a stair member made of a metal plate that forms a tread plate for the round portion is fixed to the upper portion of the horizontally bent stringer and the girders.

JP-A-11-148213

In the prior art described above, the treads and the riser of the staircase can be easily formed by using a single bent metal plate, and the structure is easy to install. However, since the force girder that supports the straight part and the round part of the stairs is integrally formed, the stringer becomes large and heavy. For this reason, it is necessary to use a large heavy machine such as a crane to construct the stairs, which increases the construction burden on site.

SUMMARY OF THE INVENTION In view of the above facts, the object of the present invention is to obtain a staircase structure that can reduce the construction burden at the site, in a staircase in which the straight part on the upper floor side and the straight part on the lower floor side are connected by a turn part. be.

The staircase structure according to the first aspect includes an upper floor straight portion arranged to incline from the floor of the upper floor to the lower side of the building, and a lower floor arranged to incline to the upper side of the building from the floor of the lower floor. a straight portion including a straight portion; a surrounding portion connecting the lower end of the upper straight portion and the upper end of the lower straight portion; A footboard portion extending in a substantially horizontal direction, a riser portion provided at one end of the footboard portion, and a riser portion provided at the other end of the footboard portion and arranged directly or indirectly through a member on the straight portion. at least one integrally formed stair member;

In the staircase structure according to the first aspect, the upper floor straight part arranged to incline from the floor of the upper floor to the lower side of the building, and the lower floor arranged to incline to the upper side of the building from the floor of the lower floor The straight portions are connected by the turning portion. Also, the surrounding portion includes at least one stepped member formed by bending a metal plate.

Here, the staircase member is integrally formed with a tread portion extending in a substantially horizontal direction, a riser portion provided at one end of the tread portion, and a mounting plate portion provided at the other end of the tread portion. there is Further, the mounting plate portion can be fixed directly or indirectly via a member to the girders and/or the building skeleton arranged in the straight portions including the straight portion on the upper floor and the straight portion on the lower floor. In this way, the staircase member is formed by easily forming the treads and the riser by bending the metal plate, and integrally forms the girder of the straight part and the mounting plate part fixed to the building frame at one end of the treads. Thus, the structure can be made independent of the straight portion. As a result, compared to a structure in which the circumference of the staircase is supported using girders formed integrally with the straight section, it is possible to assemble the straight section and the circumference section separately, reducing the construction burden on site. is reduced.

A staircase structure according to a second aspect is a staircase structure according to the first aspect, wherein the stair member includes a lower tread portion adjacent to the tread portion on the lower side of the building, and the riser portion includes the A fixed flange portion hangs down from one end of the tread portion and spans between the tread portion and the lower tread portion, and extends substantially horizontally from the lower end toward the tread portion directly or via a member. is fixed to the lower step plate portion.

In the staircase structure according to the second aspect, the riser of the stair member hangs down from one end of the tread and spans between the tread and the lower tread. Here, the riser plate portion and the lower tread plate portion are fixed directly or via a member using a fixed flange portion that extends substantially horizontally from the lower end portion of the riser plate portion toward the tread plate portion. As a result, the fixing portion of the riser plate is not exposed on the surface of the surrounding portion, and the workability is improved when setting the finishing material to be the design surface on the surface of the surrounding portion.

A staircase structure according to a third aspect is the configuration according to the second aspect, wherein the surrounding portion is arranged adjacent to the lower side of the building of the staircase member, and is substantially horizontally bent by bending a metal plate. It has a lower step member in which an extending lower step plate portion and a lower step mounting plate portion provided at one end of the lower step plate portion are integrally formed, and the lower step mounting plate portion is directly or indirectly via a member. It is fixed to the girder or the building frame or both which are arranged in the said straight part.

In the staircase structure according to the third aspect, the lower step member is arranged adjacent to the building lower side of the staircase member of the surrounding portion. The lower step member is formed by bending a metal plate to integrally form a lower tread portion extending in a substantially horizontal direction and a lower mounting plate portion provided at one end of the lower tread plate portion. Further, similarly to the staircase member described above, the lower mounting plate portion can be fixed directly or indirectly via a member to the girders and/or the building skeleton arranged in the straight portion. With the above configuration, in the surrounding portion, the staircase member and the lower step member each having the treads are fixed to the girders of the straight portion and the building frame as independent structures. As a result, compared to a structure in which a plurality of treads arranged around the staircase are integrally formed, the individual members of the staircase can be made lighter. Moreover, since the staircase member and the lower step member have a simple structure formed by bending a metal plate, the number of parts is small and the mounting work is easy. As a result, the work of assembling the entire surrounding portion can be easily performed.

A staircase structure according to a fourth aspect is a staircase structure according to the second aspect, wherein the surrounding portion is arranged adjacent to the lower side of the building of the stair member, and the flat plate-like lower tread portion and the lower tread plate A lower stage member having a frame-shaped body on which a section is placed, and the frame-shaped body is attached directly or indirectly via a member to the girder or the building frame or both arranged in the straight section. Fixed.

In the staircase structure according to the fourth aspect, the lower step member is arranged adjacent to the building lower side of the staircase member of the surrounding portion. The lower step member has a structure in which a flat plate-like lower step plate portion is placed on the upper portion of the frame-like body. Also, the frame-like body is fixed directly or indirectly via a member to the girders and/or the building skeleton arranged in the straight line portion. In this way, since the lower step member is supported from below while the lower step plate is placed on the frame-like body, the support rigidity of the lower step plate is enhanced. As a result, the rigidity of the entire surrounding portion including the lower stage member can be improved.

A staircase structure according to a fifth aspect is the configuration according to the fourth aspect, wherein the surrounding portion connects the mounting plate portion of the stair member and the frame-shaped body of the lower step member in the vertical direction of the building. It has a fixing member that

In the staircase structure according to the fifth aspect, the fixing member that connects the mounting plate portion of the stair member and the frame-shaped body of the lower step member in the vertical direction of the building is provided in the surrounding portion. As a result, the tread portion of the stair member is supported by the frame-like body via the fixing member. As a result, the supporting rigidity of the footboard portion as well as the lower footboard portion can be increased, and the rigidity of the entire surrounding portion can be further improved.

A staircase structure according to a sixth aspect is the configuration according to the fourth aspect or the fifth aspect, wherein the fixed flange portion extends in the vertical direction of the building, and one end is fixed to the fixed flange portion, The other end is fixed to the lower step plate portion via a plurality of connecting members fixed to the lower step plate portion via the frame-shaped body, and a gap is formed between the riser plate portion and the lower step plate portion. ing.

In the staircase structure according to the sixth aspect, a gap is formed between the riser and the lower tread by fixing the fixed flange to the lower tread through the connecting member and the frame-shaped body. . Therefore, when finishing materials are set on the surfaces of the riser portion and the lower tread portion, it is possible to carry the finishing materials of the riser side and the tread side separately to the surrounding portion and then fix them.

For example, after placing the finishing material on the riser side erected along the riser and the finishing material to be placed on the lower tread at the installation location, It is possible to fix the finishing materials to each other by driving a screw or the like into the abutting part between the part and the rear end of the finishing material on the tread side. Therefore, even when finishing materials are set at a construction site with a narrow construction space, the finishing materials for the riser side and the tread side can be brought in separately and then fixed. It does not require a working space as compared with the case of Therefore, even at a construction site where the construction space is relatively narrow, it is possible to easily set the finishing material around the staircase.

As described above, according to the staircase structure according to the first aspect, in the staircase in which the straight portion on the upper floor side and the straight portion on the lower floor side are connected by the winding portion, it is possible to reduce the construction burden on the site. It has the excellent effect of being able to

The staircase structure according to the second aspect has an excellent effect of improving the workability when setting the finishing material to be the design surface on the surface of the surrounding portion.

The staircase structure according to the third aspect has the excellent effect of facilitating the assembly work of the surrounding portion.

The staircase structure according to the fourth aspect has an excellent effect of improving the rigidity of the entire surrounding portion including the lower step member.

According to the staircase structure according to the fifth aspect, by increasing the supporting rigidity of the tread portion and the lower tread portion, it is possible to further improve the rigidity of the entire surrounding portion.

According to the staircase structure according to the sixth aspect, there is an excellent effect that finishing materials can be easily set around the staircase even at a construction site where the construction space is relatively narrow.

It is a side view of a staircase to which the staircase structure according to the first embodiment is applied. FIG. 2 is a plan view of the stairs shown in FIG. 1; 4 is a perspective view of a surrounding portion according to the first embodiment; FIG. 4A is a developed view of a steel plate forming the upper step member shown in FIG. 3, and FIG. 4B is a perspective view of the upper step member shown in FIG. 3; FIG. 4A is a developed view of a steel plate forming the lower stage member shown in FIG. 3, and FIG. 4B is a perspective view of the lower stage member shown in FIG. 3; 4 is a perspective view corresponding to FIG. 3 showing a surrounding portion according to a second embodiment; FIG. (A) is a developed view of a steel plate forming the lower stage member shown in FIG. 6, and (B) is a perspective view of the lower stage member shown in FIG. FIG. 11 is a perspective view corresponding to FIG. 3 showing a surrounding portion according to a third embodiment; (A) is a developed view of a steel plate forming the upper stage member shown in FIG. 8, and (B) is a perspective view of the upper stage member shown in FIG. 9A is a plan view of a lower tread plate portion forming the lower step member shown in FIG. 8, and FIG. 9B is a perspective view showing a frame-like body forming the lower step member; FIG. FIG. 11 is a perspective view corresponding to FIG. 3 showing a surrounding portion according to a fourth embodiment; FIG. 12 is an exploded perspective view of the surrounding portion shown in FIG. 11; FIG. 10 is a partial perspective view for explaining a method of setting the finishing material on the surrounding portion; It is a top view which shows the stairs which concern on a modification.

[First Embodiment]
A staircase 22 to which the staircase structure according to the first embodiment is applied will be described below with reference to FIGS. 1 to 5. FIG. In FIG. 1 a building 10 to which a staircase 22 is applied is schematically shown in side view. FIG. 2 also shows the stairs 22 in a plan view. In addition, in FIG. 1, illustration of the left side wall 12A, the front side wall 12B, the right side wall 12C, and the intermediate wall 12D of the staircase 12 is omitted for convenience of explanation.

As shown in these figures, the staircase 22 is a folded staircase that is substantially U-shaped in plan view. The staircase 22 is installed inside the staircase 12 of the building 10 and connects the lower floor space 14 and the upper floor space 16 of the building 10 . The staircase 12 is surrounded by a left side wall 12A, a front side wall 12B, and a right side wall 12C on three sides excluding the ascending and descending sides of the stairs 22, and an intermediate wall 12D is provided between the ascending and descending sides. is provided. In the staircase 12, a plurality of pillars 13 as a building frame are arranged along the front wall 12B. Specifically, pillars 13A, 13B, and 13C are arranged in this order from the corners of the left side wall 12A and the front side wall 12B. The pillars 13A, 13B, and 13C are each rectangular and arranged parallel to each other with the building height direction as the longitudinal direction.

The staircase 22 includes a straight portion 23 having an upper straight portion 24 and a lower straight portion 26 and a pair of winding portions 28 . An upper floor straight portion 24 of the straight portion 23 is arranged along the left side wall 12A of the staircase 12, and is a straight staircase that is inclined downward from the upper floor portion 20 forming the descending mouth of the staircase 22. Department. The upper floor straight portion 24 is composed of a pair of force beams 30 arranged in parallel with a predetermined interval, and a plurality of step plate members 32 fixed on the force beams 30 . The force girder 30 of the upper floor straight portion 24 is fixed at its upper end to the floor beam 25 that supports the upper floor portion 20, and is arranged to be inclined toward the lower side of the building. The tread member 32 is a plate material having a tread portion and a riser portion, and is bolted while being placed on the force girder 30 . A finishing material 34 serving as a design surface is set on the surface of the step plate member 32 . Note that the force girder 30 corresponds to the "girder" in the present invention.

On the other hand, the lower floor straight portion 26 of the straight portion 23 is arranged along the right side wall 12C of the staircase 12 and extends obliquely upward from the lower floor portion 18 forming the entrance of the stairs 22. is. Further, the lower straight line portion 26 is arranged substantially parallel to the upper straight line portion 24 in plan view. The lower straight section 26 includes a pair of force girders 30 and a plurality of step plate members 32 in the same manner as the upper straight section 24 described above. The lower end of the force girder 30 of the lower straight portion 26 is connected to the lower floor portion 18, and is arranged to incline toward the upper side of the building. Since the structure of the step plate member 32 is the same as that of the step plate member 32 of the upper floor straight part 24, description is omitted.

A pair of surrounding parts 28 are provided in the middle part of the staircase 22 in the vertical direction of the building, and connect the above-described upper floor linear part 24 and lower floor linear part 26 . The pair of surrounding portions 28 includes a surrounding portion 28A provided on the lower end portion side of the upper floor straight portion 24 and a surrounding portion 28B arranged on the upper end portion side of the lower floor straight portion 26. As shown in FIG. The surrounding portion 28B is arranged adjacent to the surrounding portion 28A, and is arranged below the surrounding portion 28A in the vertical direction of the building. The surrounding portion 28B is structurally the same as the surrounding portion 28A, and is installed on the upper end portion side of the lower floor linear portion 26 in the direction in which the surrounding portion 28A shown in FIG. 2 is rotated clockwise by 90°. is.

In addition, the surrounding portions 28A and 28B each form a two-step staircase portion, and each of them can be raised and lowered in a substantially L shape in a plan view. As described above, the surrounding portions 28A and 28B are installed in directions different from each other by 90°, thereby forming a staircase portion that can be ascended and descended so as to be folded back in a substantially U shape in plan view. Thereby, the upper floor linear portion 24 and the lower floor linear portion 26 are folded back and connected by the surrounding portions 28A and 28B.

The configuration of the pair of surrounding portions 28 will be described in detail below. Since the structures of the surrounding portion 28A and the surrounding portion 28B are the same, the following description will focus on the surrounding portion 28A arranged on the lower end portion side of the upper floor linear portion 24. As shown in FIG.

(Circumference part 28A)
As shown in FIG. 3, the turnaround portion 28A includes an upper step member 36 that forms a step on the upper side of the building and a lower step member that is positioned adjacent to the upper step member 36 and forms a step on the lower side of the building. 38. Here, FIG. 4A shows a developed view of the steel plate forming the upper stage member 36. As shown in FIG. 4(B) shows a perspective view of the upper stage member 36 formed by bending the steel plate shown in FIG. 4(A) along the broken line in FIG. 4(A).

As shown in these figures, the upper stage member 36 is formed by bending a steel plate punched into a predetermined shape. Specifically, the upper step member 36 includes an upper step plate portion 40 extending along a substantially horizontal plane, a riser plate portion 42 provided at one end of the upper step plate portion 40, and an upper step plate portion 40 provided at the other end of the upper step plate portion 40. The upper mounting plate portion 44 is integrally formed. The upper step member 36 corresponds to the "stair member", the upper step plate portion 40 to the "tread plate portion", and the upper mounting plate portion 44 to the "mounting plate portion" in the present invention.

As shown in FIGS. 2 and 4A, the upper tread portion 40 is arranged on the upper side portion 40A constituting one end arranged on the upper floor linear portion 24 side, and on the left side wall 12A of the staircase 12. It has a left side portion 40B forming one end and a lower side portion 40C forming one end disposed on the lower stage member 38, and has a substantially triangular shape in plan view.

As shown in FIG. 4B, the riser portion 42 extends substantially vertically downward from the lower side portion 40C of the upper tread portion 40 and has a substantially rectangular shape when viewed from the front. The riser plate portion 42 constitutes a riser plate portion that connects the upper step plate portion 40 and a lower step plate portion 62, which will be described later, in the vertical direction of the building. The step width dimension of the riser plate portion 42 is set shorter than the length of the lower side portion 40C. Therefore, in the upper stage member 36, spaces 43 communicating with the lower side of the upper tread section 40 are formed on both sides of the riser section 42 in the stair width direction (see FIG. 3).

A fixed flange portion 46 is formed at the lower end portion of the riser portion 42 and extends substantially horizontally from the lower end portion toward the upper tread portion 40 side. The fixed flange portion 46 serves as a mounting surface for bolting the upper stage member 36 to the lower stage member 38, and is formed with three flange holes 48 penetrating in the plate thickness direction.

On the other hand, the upper mounting plate portion 44 includes a first plate portion 50 and a second plate portion 52 . The first plate portion 50 extends substantially vertically downward from the upper side portion 40A of the upper step plate portion 40 and is formed in a substantially rectangular shape when viewed from the front. The first plate portion 50 has a longitudinal direction in the direction in which the upper side portion 40A extends, and two first holes 54 penetrating in the plate thickness direction are formed on both sides in the longitudinal direction. The first holes 54 correspond to the through holes 31 formed in the pair of force girders 30 of the upper straight portion 24, and bolts (not shown) passing through the through holes 31 are tightened. As a result, the first plate portion 50 is fixed to the force girder 30 of the upper straight portion 24 (see FIG. 3).

As shown in FIGS. 3 and 4B, the second plate portion 52 extends substantially vertically downward from the left side portion 40B of the upper tread portion 40 and has a substantially rectangular shape when viewed from the front. The second plate portion 52 has a longitudinal direction in the extending direction of the left side portion 40B, and two second holes 56 penetrating in the plate thickness direction are formed at one end of the longitudinal direction. This second hole 56 corresponds to the through hole 60 of the first bracket 58 . The first bracket 58 is an angle having a substantially L-shaped cross section, and one side surface of the first bracket 58 is fixed by welding or the like to the pillar 13A arranged at the corner between the left side wall 12A and the front side wall 12B of the staircase 12. ing. The other side surface of the first bracket 58 is arranged substantially parallel to the second plate portion 52, and has a through hole 60 extending therethrough in the plate thickness direction. A bolt (not shown) passing through a through hole 60 of the first bracket 58 is screwed into the second hole 56 . Thereby, the second plate portion 52 is fixed to the column 13A via the first bracket 58 .

With the above configuration, the upper step member 36 is fixed and supported by the upper mounting plate portion 44 to the power girder 30 of the upper straight portion 24 and the column 13A.

Further, as shown in FIG. 3, in this embodiment, the upper step member 36 is provided with a stiffening member 61 to increase the support rigidity of the upper step plate portion 40 . The stiffening member 61 is, for example, an angle having a substantially L-shaped cross section, and extends so as to bridge between the riser plate portion 42 and the first plate portion 50 . The stiffening member 61 includes a vertical surface portion 61A extending in the height direction of the building in a longitudinal cross-sectional view, and a horizontal surface portion 61B bending at right angles from the upper end of the vertical surface portion 61A and extending substantially horizontally. At both ends in the longitudinal direction of this stiffening member 61, the ends of the vertical surface portion 61A are welded to the riser plate portion 42 and the first plate portion 50, respectively, and the ends of the horizontal surface portion 61B are welded to the upper step plate portion 40. there is The upper surface of the horizontal surface portion 61B is in contact with the lower surface of the upper step plate portion 40 and supports the upper step plate portion 40 from the lower side of the building. Furthermore, the surface of the upper tread plate portion 40 and the riser plate portion 42 of the upper step member 36 is provided with a finishing material 34 that constitutes a design surface (see FIGS. 1 and 2). 2 and 4 to 5, the stiffening member 61 is omitted for convenience of explanation.

On the other hand, as shown in FIG. 3 , a lower stage member 38 is arranged on the building lower side of the upper stage member 36 and adjacent to the lower side portion 40C of the upper step plate portion 40 . Here, FIG. 5A shows a developed view of the steel plate forming the lower stage member 38. As shown in FIG. 5(B) shows a perspective view of a lower stage member 38 formed by bending the steel plate shown in FIG. 5(A) along the broken line in FIG. 5(A).

As shown in these figures, the lower step member 38 is also formed by bending a steel plate punched into a predetermined shape, similarly to the upper step member 36 described above. Specifically, the lower step member 38 is integrally formed with a lower step plate portion 62 extending along a substantially horizontal plane and a lower mounting plate portion 64 provided at one end of the lower step plate portion 62 .

As shown in FIGS. 2 and 5A, the lower tread portion 62 includes a riser side portion 62A arranged along the riser plate portion 42 in a plan view, and a front side wall 12B side of the staircase 12. It has a front side portion 62B that constitutes one end, and a right side portion 62C that constitutes one end disposed on the right side wall 12C side of the staircase 12, and has a substantially triangular shape in plan view.

As shown in FIG. 5B, the riser side portion 62A is arranged so as to overlap the lower side portion 40C of the upper tread portion 40 in plan view, and the riser portion 42 suspended from the lower side portion 40C is fixed. A flange portion 46 is placed. A through hole 66 corresponding to the flange hole 48 of the fixed flange portion 46 is formed in the riser side portion 62A. A bolt 68 passing through the through hole 66 and the flange hole 48 is inserted through the lower step plate portion 62 from the lower side of the building, and the bolt 68 is screwed to a nut 69 arranged on the upper surface of the fixed flange portion 46 . As a result, the riser plate portion 42 of the upper step member 36 is fixed to the lower step plate portion 62 via the fixing flange portion 46 (see FIG. 3). Alternatively, the riser plate portion 42 may be fixed to the lower step plate portion 62 by inserting the bolt 68 from the upper surface side of the fixed flange portion 46 and placing the nut 69 on the lower surface of the lower step plate portion 62 .

As shown in FIGS. 3 and 5B, the lower mounting plate portion 64 includes a third plate portion 70, a fourth plate portion 72, a fifth plate portion 74, and a sixth plate portion 76. I have. The third plate portion 70 and the fourth plate portion 72 are formed on both sides of the riser side portion 62A of the lower tread portion 62 and hang substantially vertically downward. The third plate portion 70 is arranged substantially parallel to the force girder 30 of the upper straight portion 24, and is formed with two third holes 71 penetrating in the plate thickness direction. The third hole 71 corresponds to the through hole 31 formed in the force girder 30 of the upper floor straight portion 24, and a bolt (not shown) passing through the through hole 31 is tightened. Thereby, the third plate portion 70 is fixed to the power girder 30 of the upper straight portion 24 .

On the other hand, the fourth plate portion 72 is arranged substantially parallel to the first bracket 58 described above, and is formed with two fourth holes 73 penetrating in the plate thickness direction. The fourth hole 73 corresponds to the through hole 60 of the first bracket 58, and a bolt (not shown) penetrating through the through hole 60 is tightened. Thereby, the fourth plate portion 72 is fixed to the pillar 13A via the first bracket 58 .

Further, the fifth plate portion 74 hangs substantially vertically downward from the front side portion 62B of the lower step plate portion 62 . Also, the sixth plate portion 76 hangs substantially vertically downward from the right side portion 62</b>C of the lower step plate portion 62 . A sixth hole 79 penetrating in the plate thickness direction is formed at one longitudinal end of the sixth plate portion 76 . The sixth hole 79 corresponds to the through hole 82 of the second bracket 80 .

The second bracket 80 is formed of an angle having an L-shaped cross section, like the first bracket 58 described above, and one side surface thereof is fixed to the column 13B by welding or the like. The other side surface of the second bracket 80 is arranged substantially parallel to the sixth plate portion 76 . A bolt (not shown) passing through the through hole 82 of the second bracket 80 is screwed into the sixth hole 79 . Thereby, the sixth plate portion 76 is fixed to the pillar 13B via the second bracket 80 .

With the above configuration, the lower step member 38 is fixed and supported by the lower mounting plate portion 64 to the power girder 30 of the upper straight portion 24 and the pillars 13A and 13B.

Further, as shown in FIG. 3, the lower stage member 38 is provided with a stiffening member 61 similar to the above-described upper stage member 36 to increase the support rigidity of the lower step plate portion 62 . The stiffening member 61 of the lower stage member 38 extends so as to bridge between the fifth plate portion 74 and the sixth plate portion 76 of the lower mounting plate portion 64 . At both ends of the stiffening member 61 in the longitudinal direction, the ends of the vertical surface portion 61A are welded to the fifth plate portion 74 and the sixth plate portion 76, respectively, and the ends of the horizontal surface portion 61B are welded to the lower step plate portion 62. there is The upper surface of the horizontal surface portion 61B is in contact with the lower surface of the lower step plate portion 62 and supports the lower step plate portion 62 from the lower side of the building. Further, the surfaces of the lower step plate portion 62 and the sixth plate portion 76 of the lower step member 38 are provided with the finishing material 34 in the same manner as the upper step member 36 described above (see FIGS. 1 and 2).

(Circumference part 28B)
As described above, the configuration of the surrounding portion 28B is the same as that of the surrounding portion 28A, so detailed description thereof will be omitted. The encircling portion 28B is arranged on the upper end side of the lower floor linear portion 26 in a direction obtained by rotating the encircling portion 28A shown in FIG. 2 clockwise by 90°.

As shown in FIG. 2, in the upper step member 36 of the surrounding portion 28B, the left side portion 40B of the upper step plate portion 40 is arranged on the side of the front wall 12B of the staircase 12. Therefore, the left side portion 40B hangs down. The second plate portion 52 serves as an attachment surface for the columns 13B and 13C. As an example, both ends in the longitudinal direction of the second plate portion 52 are bolted to the columns 13B and 13C via brackets (reference numerals omitted). In addition, it is good also as a structure by which the 1st board part 50 is fixed to the column 13B via a bracket.

Further, in the lower stage member 38 of the surrounding portion 28B, the fourth plate portion 72 is arranged in the vicinity of the column 13C and serves as an attachment surface to the column 13C. As an example, the fourth plate portion 72 is bolted to the column 13C via a bracket (reference numerals omitted). In addition, it is good also as a structure by which the 5th board part 74 is fixed to 13 C of columns via a bracket.

Further, in the lower step member 38, the right side portion 62C of the lower step plate portion 62 is arranged on the lower straight portion 26 side. Therefore, the sixth plate portion 76 suspended from the right side portion 62C serves as a mounting surface for the power girder 30 of the lower floor linear portion 26. As shown in FIG. As an example, the sixth plate portion 76 is directly bolted to the force girder 30 of the lower straight portion 26 . In addition, it is good also as a structure by which the 3rd board part 70 or the 5th board part 74 is fixed to the force girder 30 via a bracket.

(action/effect)
Next, the operation and effects of this embodiment will be described.

In the staircase 22 according to the present embodiment, the upper floor linear portion 24 arranged to incline from the upper floor portion 20 to the lower side of the building, and the lower floor arranged to incline to the upper side of the building from the lower floor portion 18 A straight portion 26 is connected by a pair of turning portions 28 . The surrounding portion 28 includes an upper stage member 36 formed by bending a steel plate.

Here, the upper step member 36 includes an upper step plate portion 40 extending in a substantially horizontal direction, a riser plate portion provided at one end of the upper step plate portion 40, and an upper mounting plate portion 44 provided at the other end of the step plate portion. , are integrally formed. In addition, the upper mounting plate portion 44 can be fixed directly or indirectly via a member to the force girder 30 and/or the column 13 arranged in the straight portion 23 including the upper straight portion 24 and the lower straight portion 26. It is said that

In this way, the upper step member 36 can easily form the upper step plate portion 40 and the riser plate portion 42 by bending a steel plate, and at one end of the upper step plate portion 40 is fixed to the power girder 30 and the pillar 13 of the straight portion 23 . By integrally forming the upper mounting plate portion 44 , the structure can be made independent of the straight portion 23 . As a result, compared to a structure in which the circumference of the staircase is supported using girders integrally formed with the straight section, the work of assembling the straight section 23 and the circumference section 28 can be performed separately. Construction burden is reduced.

In this embodiment, the riser portion 42 of the upper step member 36 hangs down from one end of the upper step plate portion 40 and spans between the upper step plate portion 40 and the lower step plate portion 62 . Here, the riser plate portion 42 and the lower step plate portion 62 are fixed via a fixed flange portion 46 extending substantially horizontally from the lower end portion of the riser plate portion 42 toward the upper step plate portion 40 side. As a result, the fixing portion of the riser plate portion 42 is not exposed on the surface of the surrounding portion 28, and workability can be improved when setting the finishing material 34, which will be the design surface, on the surface of the surrounding portion 28.

In addition, in this embodiment, a lower step member 38 is arranged adjacent to the upper step member 36 on the lower side of the building. It is formed by processing. The lower step member 38 is integrally formed with a lower step plate portion 62 extending in a substantially horizontal direction and a lower mounting plate portion 64 provided at one end of the lower step plate portion 62 . In addition, the lower mounting plate portion 64 can be fixed directly or indirectly via a member to the force girder 30 and/or the column 13 arranged on the straight portion 23 .

Thus, in this embodiment, the upper stage member 36 and the lower stage member 38 each having a tread are fixed to the force girder 30 of the straight section 23 and the column 13 as independent structures. As a result, compared to a structure in which a plurality of treads arranged around the staircase are integrally formed, the individual members of the surrounding portion 28 are lightened. Moreover, since the upper stage member 36 and the lower stage member 38 are simply constructed by bending a steel plate, the number of parts is small and the mounting work is easy. As a result, the assembly work of the entire surrounding portion 28 can be easily performed.

Further, in this embodiment, the upper stage member 36 and the lower stage member 38 are bolted to the force girder 30 of the straight portion 23 and the column 13 . Therefore, the horizontal positions of the upper step plate portion 40 and the lower step plate portion 62 can be finely adjusted by adjusting the degree of tightening of the bolts. As a result, compared to a staircase structure in which the treads are welded to the force beams of the surrounding portion, the assembly accuracy of the surrounding portion of the staircase can be improved.

In this embodiment, spaces 43 communicating with the lower side of the upper tread portion 40 are provided on both sides of the riser plate portion 42 in the stair width direction when the upper step member 36 and the lower step member 38 are assembled. ing. Therefore, the fixing portion can be confirmed from the back side of the upper mounting plate portion 44 through the space 43, and workability in fixing the upper mounting plate portion 44 to the force girder 30 or the column 13 can be improved.

[Second embodiment]
A staircase 84 to which the staircase structure according to the second embodiment is applied will be described below with reference to FIGS. 6 and 7. FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached|subjected and the description is omitted. In addition, FIG. 6 shows a perspective view of the mounting structure of the surrounding portion 86A arranged on the lower end portion side of the upper floor straight portion 24, the force girder 30, and the column 13. As shown in FIG. Further, FIG. 7A shows a developed view of the steel plate forming the lower stage member 88. As shown in FIG. 7(B) shows a perspective view of a lower stage member 88 formed by bending the steel plate shown in FIG. 7(A) along the broken line in FIG. 7(A).

As shown in these figures, in the staircase 84, the shape of the lower stage member 88 forming the surrounding portion 86 is different from that of the lower stage member 38 of the first embodiment.

As shown in FIGS. 7(A) and 7(B), the lower step member 88 is formed by bending a steel plate punched into a predetermined shape, and extends along a substantially horizontal plane. A portion 90 and a lower mounting plate portion 92 provided at one end of the lower step plate portion 90 are integrally formed. The lower tread portion 90 is configured as a portion corresponding to the lower tread portion 62 of the first embodiment, and has a riser side portion 90A, a front side portion 90B, and a right side portion 90C. It has a triangular shape.

The lower mounting plate portion 92 includes a third plate portion 94 that hangs substantially vertically downward from one longitudinal end of the riser side portion 90A, and a fifth plate portion 96 that hangs substantially vertically downward from the front side portion 90B. and The third plate portion 94 corresponds to the third plate portion 70 of the first embodiment, and is fastened to the force girder 30 of the upper straight portion 24 using bolts (not shown). Further, the fifth plate portion 96 is configured as a portion corresponding to the fifth plate portion 74 of the first embodiment.

Here, a horizontal flange portion 98 is provided at the lower end portion of the fifth plate portion 96 and extends substantially horizontally from the lower end portion toward the lower step plate portion 90 side. Two seventh holes 100 penetrating in the plate thickness direction are formed at both ends of the horizontal flange portion 98 in the longitudinal direction. The seventh hole 100 corresponds to through holes 104 formed in the pair of third brackets 102 .

The third bracket 102 includes joint portions 102A fixed to the side surfaces of the pillars 13A and 13B, respectively, and a mounting surface portion 102B formed at the upper end portion of the joint portion 102A and on which the horizontal flange portion 98 is mounted. . The joint portion 102A is a plate having a substantially L-shaped cross section, and one side surface of the joint portion 102A is fixed to the columns 13A and 13B by welding or the like. The mounting surface portion 102B extends in a plate shape substantially horizontally from the upper end portion of the other side surface of the third bracket 102, and has two through holes 104 extending therethrough in the plate thickness direction.

As shown in FIG. 6 , both ends of the horizontal flange portion 98 are mounted on the mounting surface portions 102B of the pair of third brackets 102 . The seventh hole 100 of the horizontal flange portion 98 is fastened with a bolt (not shown) inserted into the through hole 104 from the lower side of the mounting surface portion 102B. Thereby, the fifth plate portion 96 is fixed to the pillars 13A and 13B via the pair of third brackets 102 .

(action/effect)
Since the staircase 84 having the above configuration basically follows the configuration of the staircase 22 according to the first embodiment, similar actions and effects can be obtained.

Further, in the present embodiment, a horizontal flange portion 98 extending substantially horizontally is formed at the lower end portion of a fifth plate portion 96 integrally formed with the lower step plate portion 90, and the horizontal flange portion 98 extends toward the third bracket. It is fixed to the pillars 13A and 13B while being placed on the 102. As shown in FIG. As a result, the lower step plate portion 90 can be fixed with the horizontal flange portion 98 placed on the third bracket 102, so that the fastening portion between the force girder 30 and the column 13 can be easily positioned. can improve sexuality.

[Third Embodiment]
A staircase 200 to which the staircase structure according to the third embodiment is applied will be described below with reference to FIGS. 8 to 10. FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached|subjected and the description is omitted. 8 shows an exploded perspective view of the mounting structure of the surrounding portion 202A arranged on the lower end portion side of the upper floor straight portion 24, the force girder 30, and the column 13. As shown in FIG. Further, FIG. 9A shows a developed view of the steel plate forming the upper stage member 204. As shown in FIG. 9(B) shows a perspective view of an upper stage member 204 formed by bending the steel plate shown in FIG. 9(A) along the broken line in FIG. 9(A). 10(A) shows a plan view of a lower step plate portion 210 that constitutes the lower step member 206, and FIG. 10(B) shows a frame-like body 212 that constitutes the lower step member 206. FIG. is shown in perspective view.

As shown in these figures, in the surrounding portion 202 of the staircase 200, the lower step plate portion 210 is placed on the frame-like body 212, and the upper step member 204 and the frame-like body 212 are connected by a pair of fixing members 224. It is characterized by being

As shown in FIGS. 9A and 9B, the upper step member 204 is formed by bending a steel plate punched into a predetermined shape, like the upper step member 36 of the first embodiment. , the upper step plate portion 40, the riser plate portion 42, and the upper mounting plate portion 44 are integrally formed. Further, in the present embodiment, one ends of a pair of fixing members 224 described later are bolted to the second plate portion 208 of the upper mounting plate portion 44 . The second plate portion 208 corresponds to the second plate portion 52 of the first embodiment, and extends substantially vertically downward from the left side portion 40B of the upper tread portion 40, and is formed in a substantially rectangular shape when viewed from the front. The second plate portion 208 is formed with two fastening holes 226 penetrating in the plate thickness direction at one end in the longitudinal direction and at the central portion.

The lower step member 206 includes a plate-like lower step plate portion 210 made of a steel plate, and a frame-like body 212 formed in a substantially rectangular frame shape in a plan view. The lower step plate portion 210 is configured as a portion corresponding to the lower step plate portion 62 of the first embodiment, has a riser side portion 210A, a front side portion 210B and a right side portion 210C, and has a substantially triangular shape in plan view. None. A through hole 214 corresponding to the flange hole 48 of the fixed flange portion 46 is formed in the riser side portion 210A.

As shown in FIG. 10(B), the frame-shaped body 212 has a configuration in which four channel steels 216A, 216B, 216C, and 216D are joined to form a rectangular frame by a method such as welding. In this embodiment, one reinforcing beam 218 made of channel steel is bridged between the channel steels 216A and 216C arranged parallel to each other. Note that the frame-shaped body 212 may be configured without the reinforcing beams 218 .

As shown in FIG. 8, the web portions of the channel steels 216A, 216B, 216C, and 216D forming the frame-shaped body 212 are appropriately provided with through-holes 220 penetrating in the plate thickness direction. 30 and column 13 are bolted using bolts (not shown). As an example, in the frame-shaped body 212 arranged in the surrounding portion 202A, the longitudinal direction end portions of the channel steel 216B arranged facing the upper floor straight portion 24 are provided with the force beams 30 passing through the upper floor straight portion 24. A through hole 220 corresponding to the hole 31 is formed. Thereby, the channel steel 216B is fixed to the force girder 30 of the upper straight part 24. As shown in FIG. In addition, channel steel 216C and channel steel 216D are each provided with a through hole 220 at one end in the longitudinal direction. It corresponds to the through holes 60 and 82 of the bracket 58 and the second bracket 80 . Thereby, the channel steel 216C and the channel steel 216D are fixed to the columns 13A and 13B via the first bracket 58 and the second bracket 80, respectively.

On the other hand, the lower tread portion 210 is placed on the upper portion of the frame-like body 212 with the corners of the front side portion 210B and the right side portion 210C aligned with the corners of the frame-like body 212 . The lower step plate portion 210 is fixed to the upper portion of the frame-like body 212 by a method such as welding. In this state, substantially half of the frame-shaped body 212 is covered by the lower tread portion 210 in plan view.

The pair of fixing members 224 are long plate bodies (angles) having a substantially L-shaped cross section, and include a vertical wall portion 224A extending in the vertical direction of the building and a vertical wall portion 224A extending substantially horizontally from the lower end of the vertical wall portion 224A. horizontal portion 224B. A through hole (not numbered) corresponding to the fastening hole 226 of the second plate portion 208 is formed in the upper portion of the vertical wall portion 224A. It is

On the other hand, the horizontal portion 224B can be placed on the upper flange portion 216C1 of the channel steel 216C arranged along the second plate portion 208 in plan view. The horizontal portion 224B is formed with two angle holes 230 penetrating in the plate thickness direction. The angle holes 230 correspond to through holes 232 formed in the upper flange portion 216C1 of the channel steel 216C, and are fixed to the channel steel 216C using bolts (not shown). As a result, the upper step member 204 and the frame-like body 212 are connected in the vertical direction of the building by a pair of fixing members 224 .

In this embodiment, the fixing member 224 is bridged between the second plate portion 208 and the channel steel 216C, but the fixing member 224 is bridged between the first plate portion 50 and the channel steel 216B. may be configured. Alternatively, the fixing member 224 may span both between the second plate portion 208 and the channel steel 216C and between the first plate portion 50 and the channel steel 216B.

(action/effect)
The staircase 200 having the above configuration can obtain the same functions and effects as the staircase 22 according to the first embodiment in that the winding portion 202 of the staircase 200 is a structure different from the linear portion 23. .

Further, in this embodiment, the lower step plate portion 210 of the lower step member 206 is supported from below while being placed on the frame-shaped body 212 . Therefore, the support rigidity of the lower step plate portion 210 is enhanced. As a result, the rigidity of the entire surrounding portion 202 including the lower stage member 206 can be improved.

Further, in the surrounding portion 202 of the present embodiment, the upper step plate portion 40 of the upper step member 204 is supported by the frame-like body 212 via a pair of fixing members 224 . As a result, the support rigidity of the upper step plate portion 40 as well as the lower step plate portion 210 can be increased, and the rigidity of the entire surrounding portion can be further improved.

Further, according to the above configuration, the frame-like body 212 supports the entire surrounding portion 202 including the upper step member 204 and the lower step plate portion 210 from the lower side of the building. Therefore, the surrounding part 202 can be brought into the construction site after being pre-assembled at the manufacturing factory. Therefore, the construction period at the construction site can be shortened, and the productivity of the stairs 200 can be improved.

Further, according to the structure of the surrounding portion 202 described above, the upper step member 204 and the lower step plate portion 210 can be sequentially assembled on the upper portion of the frame-like body 212 placed on the workbench in the manufacturing factory. Therefore, the surrounding portion 202 can be formed while maintaining the horizontal positions of the upper step plate portion 40 and the lower step plate portion 210 with the frame-shaped body 212, and the quality at the time of shipment can be improved.

[Fourth Embodiment]
A staircase 300 to which the staircase structure according to the fourth embodiment is applied will be described below with reference to FIGS. 11 to 13. FIG. In addition, about the same component as 1st Embodiment and 3rd Embodiment which were mentioned above, the same number is attached|subjected and the description is omitted. 11 shows a perspective view of a surrounding portion 302A disposed on the lower end portion side of the upper straight portion 24. As shown in FIG. Also, FIG. 12 shows an exploded perspective view of the surrounding portion 302A.

As shown in these figures, the surrounding portion 302 of this embodiment basically follows the surrounding portion 202 of the third embodiment, but the riser plate portions 306 of the upper stage member 304 are connected to a pair of joints. It is characterized in that it is fixed to the lower step plate portion 310 of the lower step member 308 via the member 314 and the frame-shaped body 212 .

The upper step member 304 includes a riser plate portion 306 that hangs substantially vertically downward from the lower side portion 40C of the upper step plate portion 40 . The riser plate portion 306 is configured as a portion corresponding to the riser plate portion 42 of the first embodiment, but the dimension of the riser plate portion 306 in the vertical direction of the building is set slightly smaller than that of the riser plate portion 42 . there is A fixed flange portion 46 similar to that of the first embodiment is provided at the lower end portion of the riser plate portion 306 .

As shown in FIG. 12, the lower step member 308 is made of a steel plate, and includes a substantially triangular lower tread portion 310 in a plan view and a frame-like body having a rectangular frame shape in a plan view to support the lower step plate portion from below. 212. Since the frame-shaped body 212 has the same configuration as the frame-shaped body 212 of the third embodiment, detailed description thereof will be omitted. In the frame-like body 212, a reinforcing beam 312 is laid across between channel steels 216A and 216D arranged so as to be orthogonal to each other. The reinforcing beam 312 is formed of channel steel, and a web portion 312A of the channel steel is arranged along the lower side portion 40C of the upper tread portion 40 in plan view, and formed at both upper and lower end portions of the web portion 312A. A flange portion (not referenced) is arranged to extend in a direction away from the lower side portion 40C.

The lower step plate portion 310 is mounted on the upper portion of the frame-shaped body 212 described above. Specifically, the peripheral edge portion of the lower tread portion 310 is placed on the channel steels 216A and 216D of the frame-shaped body 212 and the upper surface of the reinforcing beam 312 and fixed by a method such as welding (see FIG. 11). .

On the other hand, the lower portions of a pair of connecting members 314 are fixed to the side surface of the web portion 312A of the reinforcing beam 312 on the upper stage member 304 side. The pair of connecting members 314 is a long plate body having a substantially L-shaped cross section, and includes a vertical wall portion 314A extending in the vertical direction of the building and a horizontal wall portion extending substantially horizontally from the upper end portion of the vertical wall portion 314A. A portion 314B is provided.

A through hole (reference numeral omitted) is formed in the lower end portion of the vertical wall portion 314A of the connecting member 314 and penetrates in the plate thickness direction. (reference numeral omitted), bolts 316 are inserted through both through holes, and the lower portion of the connecting member 314 is bolted to the reinforcing beam 312 . A through-hole 318 is formed in the horizontal portion 314B of the connecting member 314 so as to extend therethrough in the plate thickness direction. The through-holes 318 correspond to the through-holes (reference numerals omitted) provided in the fixed flange portion 46 of the riser plate portion 306. With the fixed flange portion 46 placed on the horizontal portion 314B, bolts 320 are used to secure the through-holes 318. have been concluded. In this way, the connecting member 314 has an upper end (one end) fixed to the fixed flange portion 46 and a lower end (the other end) fixed to the lower step plate portion 310 via the reinforcing beams 312 of the frame-shaped body 212 . . As a result, the riser plate portion 306 is fixed to the lower step plate portion 310 of the lower step member 308 via the pair of connecting members 314 and the frame-like body 212 .

In this state, the riser plate portion 306 is supported by the connecting member 314 in a state slightly floating from the lower step plate portion 310, and a gap 322 is formed between the riser plate portion 306 and the lower step plate portion 310 ( See Figure 11).

Here, FIG. 13 shows a partial perspective view of the riser plate portion 306 seen from the back side of the upper stage member 304. As shown in FIG. As shown in this figure, the surface of the riser portion 306 and the lower tread portion 310 is provided with the finishing material 34 . The finishing materials 34 are a riser finishing material 34A that stands upright in the vertical direction of the building and constitutes the design surface of the riser plate portion 306, and a footboard finishing material that is placed on the lower step plate portion 310 and constitutes the design surface of the lower step plate portion 310. 34B form a substantially L shape when viewed from the side.

The riser finish material 34A and the tread plate finish material 34B are configured such that the rear end portion of the tread plate finish material 34B is abutted against the lower end portion of the riser finish material 34A to form an abutting portion 34C. The tread plate finishing material 34B is fixed to the riser finishing material 34A by a plurality of screws 324 driven substantially horizontally into the abutting portion 34C.

In setting the finishing materials 34 , first, the riser finishing materials 34 A and 34 A are arranged so as to cover the surfaces of the riser portion 306 and the lower tread portion 310 . After that, an operator enters the back side of the surrounding portion 302 (the back side of the riser plate portion 306) and drives a screw 324 into the abutment portion 34C through the gap 322 between the riser plate portion 306 and the lower step plate portion 310. complete. Note that the finishing material 34 may be configured so that the footboard finishing material 34B is fixed to the riser finishing material 34A in advance, and the finishing material 34 is set to the riser plate portion 306 and the lower step plate portion 310 .

(action/effect)
Since the staircase 300 having the above configuration basically follows the configuration of the staircase 200 according to the third embodiment, similar actions and effects can be obtained.

In this embodiment, the fixed flange portion 46 is fixed to the lower tread plate portion 310 via the connecting member 314 and the frame-shaped body 212, thereby forming a gap 322 between the riser plate portion 306 and the lower tread plate portion 310. It is Therefore, when the finishing materials 34 are set on the surfaces of the riser portion 306 and the lower tread portion 310, the finishing materials on the riser side and the tread plate side can be carried separately to the surrounding portion and then fixed.

Specifically, first, the riser finishing material 34A erected along the riser plate portion 306 and the footboard finishing material 34B placed on the lower footboard portion are placed at the installation location. After that, an operator who has entered the back side of the riser plate portion 306 drives a screw 324 into the abutting portion 34C between the lower end portion of the riser finishing member 34A and the rear end portion of the tread plate finishing member 34B to fix the finishing members together ( See Figure 13).

By setting the finishing material 34 in this way, even when working at a construction site with a narrow construction space, the riser finishing material 34A and the footboard finishing material 34B can be fixed after separately brought in, and fixed in advance. It does not require a working space compared to the case where it is carried in in a state where it is packed. Therefore, even at a construction site where the construction space is relatively narrow, the finishing material 34 can be easily set on the surrounding portion 302 of the stairs 300 .
[supplementary explanation]
As described above, the configurations of the respective embodiments described above can be appropriately combined.

For example, in each of the above-described embodiments, the upper mounting plate portion 44 and the force girder 30 of the straight portion 23 are directly bolted, but the present invention is not limited to this, and the upper mounting plate portion and the force girder of the straight portion are connected by bolts. may be fixed via a bracket.

Further, in each of the above-described embodiments, the surrounding portions 28, 86, 202, 302 are configured to include one upper step member 36, 204, 304, but the present invention is not limited to this, and the surrounding portion may include a plurality of upper step members. It is good also as a structure provided with a member. For example, another upper step member may be arranged adjacent to one upper step member on the lower side of the building, and a lower step member may be arranged on the lower side of the building of the other upper step member.

Further, in each of the above-described embodiments, the constituent members of the surrounding portions 28, 86, 202, and 302 are bolted together, but the present invention is not limited to this, and may be fixed by a method such as welding.

In addition, in each of the above embodiments, the surrounding portions 28, 86, 202, and 302 are applied to the surrounding portions of the folded stairs, but the present invention is not limited to this, and the turning portions 28, 86, 202, and 302 are applied to the folded stairs. may apply. For example, as in a staircase 400 shown in FIG. 14, the lower end portion of the upper floor linear portion 402 and the upper end portion of the lower floor linear portion 404, which are perpendicular to each other in the ascending/descending direction, are connected by the same surrounding portion 28A as in the first embodiment. good too.

In each of the above-described embodiments, the number of bolts and nuts used to fasten members together can be increased or decreased as appropriate.

In the first embodiment, the stiffening member 61 is provided on the upper step member 36 and the lower step member 38 to increase the support rigidity of the upper step plate portion 40 and the lower step plate portion 62. However, the present invention is not limited to this. Not exclusively. If the support rigidity of the upper step plate portion 40 and the lower step plate portion 62 can be ensured by the plate thicknesses thereof, the stiffening member 61 may not be provided. On the contrary, in the above embodiment, one stiffening member 61 is provided for each of the upper step member 36 and the lower step member 38, but a plurality of stiffening members 61 may be provided.

Furthermore, the stiffening member 61 is not limited to the first embodiment, and can be used in the upper stage members 36, 204, 304 and the lower stage members 88, 206, 308 described in the second to fourth embodiments. It is also possible to provide In each embodiment, the stiffening member 61 is appropriately set according to the plate thickness of the upper tread portion 40 and the lower tread portions 90, 210, and 310, so that the support rigidity thereof can be increased.

In the third and fourth embodiments, the upper stage members 204, 304 are connected to the frame-like body 212 by a pair of fixing members 224. , or three or more fixing members 224 may be used for connection.

Further, in the fourth embodiment, the fixed flange portion 46 and the lower step plate portion 310 are fixed via a pair of connecting members 314, but the present invention is not limited to this. 314 may be fixed.

13 pillar 18 lower floor (floor of lower floor)
20 upper floor (upper floor)
22 Stairs 23 Straight part 24 Upper straight part 26 Lower straight part 28 Surrounding part 30 Force girder 36 Upper step member (stair member)
38 Lower step member 40 Upper step plate portion (tread plate portion)
42 riser plate portion 44 upper mounting plate portion (mounting plate portion)
46 Fixed flange portion 62 Lower step plate portion 64 Lower mounting plate portion 84 Stairs 86 Surrounding portion 88 Lower step member 90 Lower step plate portion 92 Lower mounting plate portion 200 Stairs 202 Surrounding portion 204 Upper step member 206 Lower step member 210 Lower step plate portion 212 Frame Shaped body 224 Fixing member 300 Stairs 302 Surrounding part 304 Upper step member 306 Risers 308 Lower step member 310 Lower step plate part 314 Connecting member 322 Gap 400 Stairs 402 Upper straight part 404 Lower straight part

Claims (3)

a straight part including an upper straight part arranged to incline from the floor of the upper floor to the lower side of the building, and a straight part to the lower floor arranged to incline from the floor of the lower floor to the upper side of the building;
a surrounding portion that connects the lower end portion of the upper straight portion and the upper end portion of the lower straight portion;
A tread portion that constitutes a part of the surrounding portion and extends substantially horizontally by bending a metal plate, a riser portion that is provided at one end of the tread portion, and a riser portion that is provided at the other end of the tread portion. at least one staircase member integrally formed with a mounting plate portion fixed to a girder or building frame or both directly or indirectly arranged on the straight portion ,
The stair member is arranged such that the lower tread portion is adjacent to the tread portion on the lower side of the building,
The riser portion hangs down from one end of the tread portion and bridges between the tread portion and the lower tread portion, and a fixed flange extending substantially horizontally from the lower end portion toward the tread portion. is fixed to the lower tread portion directly or via a member,
The surrounding part is arranged adjacent to the lower side of the building of the stair member, and has a lower step member having a flat plate-like lower tread portion and a frame-shaped body on which the lower tread portion is placed,
The frame-shaped body is fixed directly or indirectly via a member to a girder or building frame or both arranged in the straight section,
The fixed flange portion extends in the vertical direction of the building, and has one end fixed to the fixed flange portion and the other end fixed to the lower tread portion via the frame-like body via a plurality of connecting members. It is fixed to the lower step plate portion, and a gap is formed between the riser plate portion and the lower step plate portion .
staircase structure. The surrounding part is arranged adjacent to the lower side of the building of the stair member, and includes a lower tread portion extending substantially horizontally by bending a metal plate, and a lower mounting plate provided at one end of the lower tread portion. and a lower stage member integrally formed with said section, and
The lower mounting plate portion is fixed directly or indirectly via a member to a girder or building frame or both arranged in the straight portion,
The staircase structure according to claim 1 . The surrounding portion includes a fixing member that connects the mounting plate portion of the stair member and the frame-shaped body of the lower step member in the vertical direction of the building.
The staircase structure according to claim 1 or 2 .

Images