JP6283556B2 - Stair structure - Google Patents

Description

  The present invention relates to a staircase structure in which, for example, a pair of folded stairs is overlapped to form an X staircase.

  Conventionally, an X staircase in which two folded staircases are stacked in a staircase room of a building may be arranged. The advantage of having an X staircase in the staircase is that it is possible to secure two direct staircases from each floor to the evacuation floor at once by providing only one staircase, and the effective use of the space in the staircase increases the rentable ratio. Is directly connected to. On the other hand, when the X staircase is provided in the building, it is generally considered that the floor height is required to be about 4600 mm in order to match the entrance / exit landing on the X staircase with the height position of each floor. Such a relatively high floor height leads to a significant increase in the overall height as the building becomes taller.

  Therefore, as shown in FIG. 12 (A), the floor height of each floor 51 is designed to be low without matching the height dimension of the X stairs 52, and between the entrance landing 53 and the floor 51 in the X stairs 52. At a place where there is a step (height difference), a step adjustment unit 54 (see FIG. 12A) including a stair (a step different from the X stair 52) 54a for allowing access to the landing 53 from the floor 51. ) And (B)) (see Patent Document 1).

JP 2011-84955 A

  However, when the step adjustment portion 54 is provided as described above, the rentable ratio is reduced by that amount, and when the X stairs are used, it is necessary to raise and lower the extra stairs 54a.

  The present invention has been made in consideration of the above-mentioned matters. The purpose of the present invention is to achieve an increase in the rentable ratio by taking in the X staircase and also to suppress the floor height, and requires an extra lift when using the X staircase. The aim is to provide an unobstructed staircase structure.

  In order to achieve the above object, a staircase structure according to the present invention is a staircase structure in which a pair of folded stairs are overlapped to constitute an X staircase, and each folded stairs is a staircase as a landing that constitutes a folded portion of the stairs. There is an intermediate landing that does not communicate with the outside, and a landing for entrance and exit that is provided above and below the intermediate landing, and is located on the outer peripheral side of a pair of side girders that support the step board of each folded stairs from both sides. In the side girders, the portion constituting the intermediate landing is a reverse beam (Claim 1).

  In the above staircase structure, of the pair of side girders, the intermediate landing place or the entrance / exit in the side girders located on the outer peripheral side of the intermediate landing place or the entrance / exit landing place in the side girder located on the inner peripheral side You may make it have a small up-down width compared with the site | part which comprises the business landing (Claim 2).

  In the above staircase structure, among the plurality of kick plates supported by the pair of side girders, the kick plates located at the uppermost and lowermost steps are joined to columns or beams arranged on the outer periphery of the pair of folded stairs. In the staircase that is vertically connected across the intermediate landing or the landing hall, the kick plate provided at the top of the lower staircase and the kickboard provided at the bottom of the upper staircase May be joined to each other (claim 3).

  In the present invention, a staircase structure that achieves the suppression of the floor height while increasing the rentable ratio by incorporating the X staircase, and does not require an extra elevation when using the X staircase, is obtained.

  That is, in the staircase structure of the invention according to each claim of the present application, it is possible to suppress the floor height to the intermediate floor while ensuring the effective height on each floor floor that requires an entrance to the outside of the staircase. Accordingly, the degree of freedom of the outer wall line is increased even under severe conditions of height restriction, and the construction cost can be reduced by suppressing the floor height. In addition, unlike the conventional staircase structure shown in FIG. 12, the staircase structure of the present invention does not require an extra staircase or a space in order to suppress the floor height. Therefore, it is not necessary to move up and down when using the X stairs.

  In the staircase structure of the invention according to claim 3, the uppermost and lowermost kick plates can be used as staircase beams (folded beams) for transmitting force to the columns or beams on the outer peripheral portion of the X staircase. Even when the vertical width of the side spar on the inner peripheral side for suppressing the height is reduced, the accompanying strength reduction can be efficiently compensated with a few kick plates.

It is a longitudinal section showing roughly the composition of the staircase structure concerning one embodiment of the present invention. It is a cross-sectional view which shows the structure of the said staircase structure roughly. FIG. 3 is an end view taken along line X1 in FIG. 2. FIG. 3 is a sectional view taken along line X2 in FIG. 2. FIG. 3 is a sectional view taken along line Y1 in FIG. It is a disassembled perspective view which shows schematically the structure of the step part of the said staircase structure. It is an enlarged view of the a part of FIG. It is an enlarged view of the b section of FIG. (A) And (B) is explanatory drawing which shows roughly the structure of the side beam of the outer peripheral side of the step structure of the prior art and the said embodiment. (A) And (B) is explanatory drawing which shows roughly the structure of the side girder of the inner peripheral side of the step structure of the prior art and the said embodiment. It is explanatory drawing which shows the structure of the step structure of the prior art and the said embodiment side by side. (A) And (B) is the longitudinal cross-sectional view and cross-sectional view which show the structure of the conventional staircase structure roughly.

  Embodiments of the present invention will be described below with reference to the drawings.

  The staircase structure according to the present embodiment shown in FIG. 1 and FIG. 2 includes an X staircase (steel frame staircase) 2 configured by overlapping a pair of folded staircases 1A and 1B in a staircase room S of a building. Each turn-up staircase 1A, 1B is provided as a landing that constitutes the turn-up section of the staircase, and is provided on the upper and lower sides of the intermediate landing 3 that does not communicate with the outside of the staircase and the outside of the staircase (outside the staircase room S) And a landing 4. In FIG. 2, reference numeral 5 denotes an entrance to the inside and outside of the X stairs 2 (step room), which is provided at a position facing the entrance / exit landing 4. Moreover, in FIG. 4, R is a handrail and is omitted in other drawings.

  As shown in FIG. 6, the stair portions of the folded stairs 1 </ b> A and 1 </ b> B include a step board 6 and a kick board 7 that are alternately and repeatedly arranged, and a pair of left and right side girders 8 and 9 that support the tread board 6 and the kick board 7 from both sides. And have. And in this embodiment, the part which comprises the intermediate landing 3 which does not require the entrance / exit 5 to the staircase S is reversed in the side beam 8 (refer FIG. 2) located in the outer peripheral side among a pair of side beam 8,9. A beam is used (see FIGS. 3 and 9). Moreover, in the side beam 9 (refer FIG. 2) located in the inner peripheral side among a pair of side beams 8 and 9, the site | part which comprises the intermediate landing 3 is a forward beam (refer FIG. 4, FIG. 10). The “outer peripheral side” is a side that is the outer side of the spiral when each folding staircase 1A, 1B is regarded as a spiral, and the “inner peripheral side” indicates a side that is the inner side of the spiral.

  Of the pair of side girders 8 and 9, the vertical width t9 of the portion constituting the intermediate landing 3 and the landing landing 4 in the side girder 9 located on the inner circumferential side is the middle in the side girder 8 located on the outer circumferential side. It is smaller than the vertical width t8 of the parts constituting the landing 3 and the landing landing 4 (see FIG. 4). In this embodiment, the vertical width t8 is 300 mm, the vertical width t9 is 150 mm, which is half of the vertical width t8, and the vertical widths of the side girders 8, 9 are substantially uniform throughout.

  Here, in the conventional staircase structure having X stairs, as shown in FIGS. 9 (A), 10 (A), and 11, the entrance / exit 4 for each floor 10 that requires the entrance / exit 5 to the staircase. In order to secure an effective height e1 (for example, 2000 mm), the floor height h1 up to the intermediate floor is a height obtained by adding the landing height t1 (for example, 300 mm) to the effective height e1 of the landing area 4 2300 mm), and the floor height H1 is relatively large, such as twice that (for example, 4600 mm).

  On the other hand, in the present embodiment, as shown in FIGS. 9B and 11, in the side beam 8, a portion constituting the intermediate landing 3 that does not require the entrance 5 to the staircase S is used as a reverse beam. As shown in FIGS. 10 (B) and 11, the intermediate landing 3 in the side girder 8 located on the outer peripheral side is the portion constituting the intermediate landing 3 or the landing landing 4 in the side girder 9 located on the inner peripheral side. Alternatively, since it has a smaller vertical width compared to the parts constituting the entrance / exit landing 4, the effective height e2 of the entrance / exit 4 on each floor 10 where the entrance 5 to the staircase S is necessary (for example, 2000 mm) ), The floor height h2 up to the intermediate floor can be suppressed to a height (for example, 2150 mm) obtained by adding a small vertical width t9 (for example, 150 mm) to the effective height e2, and the floor height H2 can be reduced accordingly. Low (eg 4300m ) Can be suppressed.

  Therefore, in the present embodiment, the degree of freedom of the outer wall line is increased even under severe conditions of height restriction, and the construction cost can be reduced by suppressing the floor height. In addition, unlike the conventional staircase structure shown in FIG. 12, the staircase structure of this embodiment does not require an extra staircase or space to suppress the floor height. Can be greatly increased, and no extra lifting is required when the X-step 2 is used.

  Further, in the present embodiment, as shown in FIG. 2, among the plurality of kick plates 7 supported by the pair of side girders 8 and 9, the kick plates 7 </ b> A and 7 </ b> B positioned at the uppermost stage and the lowermost stage are replaced by a pair of It joins to the pillars or beams (in this example, the steel pillar 11 which is a steel pillar) arranged on the outer periphery of the folding staircases 1A and 1B, and as shown in FIG. In the continuous stairs, the kick plate 7A provided at the uppermost step of the lower stairs and the kick plate 7B provided at the lowermost of the upper stairs are joined to each other by appropriate means (for example, welding). It is. Specifically, it is conceivable that the kick plates 7A and 7B are made of, for example, a flat bar (flat steel) having a thickness of 25 mm, and the flat bar is joined to the intermediate pillar 11.

  With such a configuration, the uppermost and lowermost kick plates 7A and 7B can be used as staircase beams (folded beams) for transmitting force to the columns or beams on the outer peripheral portion of the X staircase 2. It is possible to efficiently compensate for a decrease in strength due to a decrease in the vertical width of the side girder 9 on the inner peripheral side for suppressing the height with a small number of kick plates 7A and 7B.

  Then, as shown in FIG. 2, this effect is achieved by joining both ends of the side girder 9 on the inner peripheral side to columns or beams (in this example, the intermediate column 12) arranged on the outer periphery of the pair of folded stairs 1A and 1B. Thus, further enhancement can be achieved. For example, as shown in FIG. 7 and FIG. 8, this joining is performed by attaching side girders 9 to mounting members (for example, bolts) 14 on a pair of metal plate members 13 joined to the studs 12 by welding or the like. It can be done by attaching.

  As shown in the center of the right side of FIG. 11, there is a height difference between the pair of side girders 8 and 9 that support the tread board 6 and the kick board 7 on the intermediate floor, and thus the pair of side girders 8 and 9 has a height difference. Where there is a difference, for example, an extension portion extending in the vertical direction is provided at the longitudinal end portion of the tread plate 6 or the kick plate 7, and this extension portion is joined to the side girders 8 and 9. Should be kept horizontal.

  Of course, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1A Folding stairs 1B Folding stairs 2 X stairs 3 Intermediate landing 4 Entrance landing 5 Entrance 6 Tread board 7 Kick board 7A Top kick board 7B Bottom kick board 8 Outer side girder 9 Inner side girder 10 Floor 11 Spacer 12 Spacer 13 Plate-like member 14 Mounting member 51 Floor 52 X stair 53 Entrance / destination landing 54 Step adjustment part 54a Stair e1 Effective height e2 Effective height H1 Floor height H2 Floor height R Handrail S Staircase t1 Landing area Thickness t8 Vertical width t9 Vertical width

Claims (3)

A staircase structure in which a pair of folded stairs are stacked to form an X staircase,
Each folding staircase has an intermediate landing that does not lead to the outside of the staircase as a landing that constitutes the folding portion of the staircase, and a landing for entrance that is provided above and below the intermediate landing and leads to the outside of the staircase,
A staircase structure characterized in that, in a side girder located on the outer peripheral side of a pair of side girders that support the step plates of each folded staircase from both sides, a portion constituting the intermediate landing is a reverse beam.   Of the pair of side girders, the portion constituting the intermediate landing or the entrance / exit landing for the side girders located on the inner peripheral side constitutes the intermediate landing or the entrance landing for the side girders located on the outer peripheral side. The staircase structure according to claim 1, wherein the staircase structure has a smaller vertical width than that of the portion. Among the plurality of kick plates supported by the pair of side girders, the kick plates located at the uppermost and lowermost stages are joined to the columns or beams arranged on the outer periphery of the pair of folded stairs,
In the staircase portion that is vertically connected across the intermediate landing or the landing hall, the kick plate provided at the top of the lower staircase, and the kick plate provided at the bottom of the upper staircase The staircase structure according to claim 1 or 2, wherein the two are joined together.