JP2001220874A - Turned stair and tread of turned stair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turned stair and treads of the turned stair capable of reducing a stock space when storing as stock, making selection work corresponding to the bending direction of the turned stair unnecessary, capable of improving the work efficiency during shipping, and making the assembly on the job site more easier. SOLUTION: When a turning direction is arranged at a turning portion 10 in the right direction, finish work is performed to one-side horizontal surfaces at the upper stair portion usable as treads, and on the other horizontal surfaces which become the upper surfaces when a reversal is made and the turning direction is made to create a turning portion to the left 10, the finish work as same as that of the one-side horizontal surfaces are carried out and a turned stair A is formed with treads 4, 5, 6, 7 which are asymmetrical with respect to the right and left.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved staircase and a step board of a curved staircase, and more particularly, to a straight section which is provided in a building such as a wooden house and in which a resident or the like goes up and down linearly. The present invention relates to a curved staircase having a curved portion that goes up and down while moving, and a step plate provided at the curved portion of the curved staircase.

[0002]

2. Description of the Related Art Stairs of a wooden house are composed of a plurality of step boards and side girders which are arranged at predetermined positions and supported from both sides. This type of stairs requires a relatively long time even for a skilled worker to process each step board and side girders at the time of construction, and has a disadvantage of poor working efficiency. Therefore, there is known a so-called precut staircase in which a staircase can be formed only by assembling each step board and a side beam at the time of construction. The precut stairs are shipped to a construction site by combining step boards and side girders precut at a factory according to the form of the stairs.
Thus, when assembling the stairs at the construction site, it is only necessary to assemble the stepped surface of each stepboard between the side girders with the finished tread surface facing the upper surface, and the worker processes each stepboard and the side girders at the time of construction. Compared with the case, the construction period can be shortened without depending on the skill of the operator, and waste of material due to a processing error can be eliminated.

[0003] The stairs of a wooden house include a straight stair that goes up and down in a straight line, and a curved stair that changes direction in the middle of going up and down. There is a right-turn stair that goes up (or turns) and a left-turn stair that goes up (or turns) to the left.

[0004] The straight stairs are formed by arranging a plurality of step boards in a straight line. The curved stairs are formed by connecting a straight section in which the step boards are arranged in a straight line and the step boards along a bending direction. It is formed by combining the arranged bent portions. Each step plate provided on the straight staircase and the straight portion of the curved staircase has a symmetrical shape and is formed in the same shape. On the other hand, each step plate provided at the bending portion of the bending stairs is formed asymmetrically in the left and right direction, and, as a specific example, an outer edge located on the outer peripheral side in the bending direction has an inner edge in the bending direction. It is formed in a substantially triangular shape in plan view, having a larger width dimension than the inner edge located on the peripheral side. And, although each step board used for the bent portion has the same shape as the one for the right-turn staircase and the one for the left-turn staircase, the finish processing as the tread surface is opposite on each side. It is applied to the surface.
That is, each step plate of the bent portion is disposed such that a side edge having a larger width dimension is located on the left side when viewed from the ascending direction in the bent portion of the right-turn staircase, and the side that becomes the upper surface at this time Finishing processing such as lacquer painting is applied only to the treads. Conversely, in the bent portion of the left-turn staircase, lacquer coating is provided such that the side edge with the larger width is located on the right side when viewed from the upward direction, and at this time, only the upper surface side is a tread surface. Etc. are applied.

[0005] As described above, since the step plate used for the curved portion of the right-turn staircase is different from the step plate used for the curved portion of the left-turn staircase, the precut staircase is different from each step plate for the right-turn staircase. In addition, both of the step boards for the left-turn stairs are stored in stock, and one of the stairs is selected and shipped to a construction site according to the design of the house to be constructed.

However, the pre-cut stairs require a plurality of types of stocks depending on the number of stairs, the presence or absence of a landing, and the like. Since the inventory for the curved stairs is required, there is a disadvantage that a large inventory space is required.

[0007] Also, in the case where the right and left sets described above are assembled in the precut stairs, there is a possibility that a selection error such as an incorrect selection of a step board used for a bent portion for the right-turn stairs and the left-turn stairs may occur. There is.

Further, when shipping the precut stairs, it is necessary to select not only a right turn or a left turn but also a selection according to the number of stairs and the presence or absence of a landing. Is complicated, the work efficiency at the time of shipment is reduced, and there is a disadvantage that the shipment is delayed.

[0009]

According to the present invention, by solving such inconveniences, it is possible to reduce the stock space when storing the stock, and to eliminate the need for a selection operation according to the bending direction of the bending stairs. An object of the present invention is to provide a curved staircase and a stepboard of the curved staircase, which can improve work efficiency at the time of shipping and can be easily assembled at a construction site.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a linear portion provided with a symmetrical step plate and a curved portion provided with a left-right asymmetrical step plate. In the curved staircase provided with, the step board of the left-right asymmetric shape,
When one of the horizontal planes that becomes the upper surface when the bending direction is disposed in the rightward bending portion has been subjected to a finishing process that can be used as a tread surface, and the stepboard is reversed, and the bending direction is a leftward bending. The same finishing process as that of the one horizontal surface is performed on the other horizontal surface that becomes the upper surface when disposed in the portion.

In the curved staircase of the present invention, since a left-right asymmetrical step plate in which the same finishing process is performed on one horizontal plane and the other horizontal plane is disposed in the curved portion, one of the horizontal plates is provided. A right-handed staircase can be formed by disposing the horizontal surface as a tread surface in the curved portion, and a left-handed staircase can be formed by inverting the step plate and disposing the other horizontal surface on the curved portion as a tread surface. Can be formed. In addition, since the step board provided in the linear portion has a symmetrical shape, the straight portion can be formed by any of the left and right curved stairs without inverting the step plate.

Thus, in the curved staircase of the present invention, the stepboard for the right-turn staircase and the stepboard for the left-turn staircase are shared, so that, for example, when precut and stored in a factory, the right-turn staircase is used. It is not necessary to store both the step board for use and the step board for the left-turn staircase, and the inventory space can be reduced. Furthermore, when shipping to the construction site, the troublesome selection of whether the step board is for right-turning or for left-turning is not required, so that shipping at the time of shipment can be reduced and shipping can be reduced. .

Further, in the present invention, the step plate having the left-right asymmetric shape is provided with a concave groove of the same shape in both horizontal planes along the nose, and the concave groove of one horizontal plane selected as the tread surface is provided with a non-slip member. It is characterized in that it is a mounting groove, and the other horizontal groove is a connecting groove of the riser plate.

According to the present invention, the anti-slip member is mounted on the concave groove on the side that is turned upside down and becomes the lower side, irrespective of whether the right-turned stairs or the left-turned stairs are formed. Connect the riser to the groove. This eliminates the necessity of processing the groove at the construction site, thereby facilitating the assembly of the stairs and shortening the construction period.

The present invention also provides a curved staircase having a straight portion provided with a symmetrically shaped step plate and a bent portion provided with a left-right asymmetrically shaped step plate, wherein at least the bent portion is formed. The side girders provided on both sides of each step board to support the side edge of each step board, when the bending direction of the bent part is rightward, the side girders of each step board arranged in the bent part When an assembling recess for assembling and supporting one side edge is formed in one of the vertical surfaces, and when the bending direction of the bent portion is the left direction, each step plate disposed in the bent portion An assembling recess for assembling and supporting the other side edge portion is formed on the other vertical surface.

In the curved staircase of the present invention, since the side spar having the concave portion is provided on both the one vertical surface and the other vertical surface, each step board is formed by one vertical surface of the side spar. By supporting, a right-turn stair can be formed, and by supporting each step board by the other vertical surface of the side beam, a left-turn stair can be formed.

Thus, in the curved staircase of the present invention, the side beam for the right-turned staircase and the side beam for the left-turned stairway are shared, so that, for example, when the pre-cut and stored at a factory, the right-turned staircase is used. There is no need to store both the side beam for the left turn stair and the side beam for the left-turn staircase, and the inventory space can be reduced. Further, when shipping to the construction site, there is no need to select between right and left turns for the side girders, so that the work at the time of shipping can be reduced and shipping can be performed quickly.

According to the present invention, there is provided a step board having an asymmetric shape disposed on a curved portion of a curved staircase, wherein the step board is provided with the same finishing work that can be used as a tread on both upper and lower horizontal planes. When one of the horizontal surfaces is positioned on the upper surface and the tread surface is formed, the bending direction forms a rightward bent portion, and when the step is inverted, the other horizontal surface is positioned on the upper surface and the tread surface is bent. It is characterized in that the direction forms a leftward bend.

Since the step board of the present invention has the same finishing work that can be used as a tread on both upper and lower horizontal planes,
By selecting one of the horizontal planes as the tread,
A desired bent portion can be easily formed in any of the right and left bending directions.

That is, the step board can be formed on the curved portion with one horizontal plane as a tread surface to form a right-turn staircase. In addition, the step board can be inverted to use the other horizontal plane as a tread surface. By disposing in the bent portion, a left-turn staircase can be formed. As described above, in the step board, the step board for the right turn stairs and the step board for the right turn stairs can be used in common when precut and stored in a factory, for example, for the right turn stairs and the left turn stairs. It is not necessary to store both the step board for the stairs and the inventory space can be reduced. Furthermore, when shipping to the construction site, there is no need to select between right and left bending for the step board,
The work at the time of shipping can be reduced, and the product can be shipped quickly.

In addition, when the step board is precut at the factory, the work of performing the same processing on both horizontal surfaces may be performed, so that the work efficiency at the time of precut can be improved.

In addition, the step board has concave grooves of the same shape in both horizontal planes along the nose, and the concave groove of one horizontal plane which is a tread surface is a mounting groove for a non-slip member, and the groove of the other horizontal plane is formed. The concave groove serves as a connecting groove of the riser.

By providing the groove on the step board, when one horizontal surface is used as a tread surface, a non-slip member can be attached to the groove on the tread surface side, and the groove is kicked into the groove on the other horizontal surface. Boards can be mounted. As described above, since the concave grooves may be provided in both horizontal planes in the same shape, it is possible to improve work efficiency when the step board is precut at a factory or the like. In addition, since there is no need to process the groove at the construction site, the assembling of the stairs can be facilitated and the construction period can be shortened.

[0024]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1A is an explanatory plan view showing a right-handed staircase in the curved staircase of the present embodiment, FIG. 1B is an explanatory plan view showing a left-handed staircase in the curved staircase of the present embodiment, and FIG. ) Is an explanatory perspective view of a part of the bent part in FIG. 1A, FIG. 2B is an explanatory perspective view of a part of the bent part in FIG. 1B, and FIG. 4 (a) is an explanatory plan view showing a right-turn staircase in another embodiment, and FIG. 4 (b) is an explanatory side view of a right-hand staircase in another embodiment. Explanatory plan view showing a left-turn staircase, FIG. 5 is an explanatory side view of a side girder adopted in a turn staircase of another embodiment, and FIG. 6 is an explanatory view showing one of the step boards provided in a bent portion. It is a perspective view.

The curved staircase A of this embodiment is provided in a wooden house (not shown), and is called a precut staircase in which components are precut at a factory and assembled at a construction site. Then, according to the design of the wooden house, the curved staircase A of the present embodiment is a right-turned staircase 1 that rises while turning 180 ° to the right as shown in FIG. As shown in the figure, a left-turn staircase 2 which turns 180 ° to the left and rises can be selectively formed.

As shown in FIG. 1 (a), the right-turn staircase 1 includes a plurality of step plates 3 having a symmetrical shape (rectangular shape in plan view).
(Eight sheets are provided in the present embodiment, but the same symbols are used because the shapes are all the same), and four step plates 4, 5, 6, and 7 having an asymmetric shape are provided. I have. A predetermined number (four each) of the left-right symmetric step board 3 is disposed on the first straight portion 8 on the ascending start side and the second straight portion 9 on the up end side. 5, 6 and 7 are disposed on the bending portion 10 which rises while changing the direction. The first
A landing 11 is provided between the straight part 8 and the bent part 10,
The second straight portion 9 is provided continuously to the bent portion 10.
The left and right asymmetric step plates 4, 5, 6, and 7 are each formed in a substantially triangular shape in plan view in which the width dimension on the outer peripheral side is larger than the inner peripheral side in the bending direction.

Each step board 3 of the first straight portion 8 is supported on both side edges thereof by a first side beam 12 and a second side beam 13. Each of the step plates 3, 5, 5 of the bent portion 10 and the second straight portion 9
Reference numerals 6 and 7 denote the outer peripheral side edges in the bending direction supported by the third side girders 14 and the fourth side girders 15, and the inner peripheral side edges in the bending direction 16 square and the fifth side girders 17. Supported by

The landing 11 is supported by a support (not shown), and a skirting board 18 is provided on the outer peripheral side of the landing 11. Although not shown, each side girder 12, 14,.
15 is integrally fixed to the interior wall of the staircase,
17 and 16 are integrally fixed to the partition wall of the staircase.

Then, the left-turn staircase 2 shown in FIG.
Is different from the right-turn staircase 1 shown in FIG. 1A only in the bending direction of the bending portion 10, and each of the step plates 3, 4, 5, 6, 7, and each of the side girders 12, 13, 14, 15, 17. , And the square 16
The same thing as the right-turn staircase 1 is used.

That is, the asymmetric step plates 4, 5, 6,
As shown in FIGS. 2A and 2B, the same finish processing is applied to the upper and lower horizontal surfaces of each of 7. In the finishing process, for example, lacquer coating is performed so that both upper and lower horizontal surfaces can be used as tread surfaces. When one horizontal surface of each of the step plates 4, 5, 6, and 7 is disposed facing upward, as shown in FIG. 2A, a bent portion 10 whose bending direction is rightward is formed. When the step plates 4, 5, 6, and 7 are inverted and the other horizontal surface faces upward, as shown in FIG. 2B, a bent portion 10 whose bending direction is a left direction is formed. Is done.

In the symmetric step board 3,
As shown in FIGS. 1 (a) and 1 (b), a right-turn staircase 1
Or the left-turn staircase 2 can be used without being inverted, so that the finishing process for the tread is performed only on one horizontal surface. In addition, each step board 3,
As shown in FIGS. 2 (a) and 2 (b), a riser plate 19 is provided between 4, 5, 6, and 7.

As shown in FIG. 3A, the fourth side girders 15 extend from the bent portion 10 to the second linear portion 9 to form one of the step plates 5, 6, 7, 3 (see FIG. 1). A step board supporting recess 20 for engaging and supporting the side edge, and each of the step boards 5, 6, 7, 3;
A kick plate support recess 21 is provided for engaging and supporting one side edge of the kick plate 19 (see FIG. 2) provided therebetween. As shown in FIG. 3B, the fifth side girder 17 faces the fourth side girder 15 from the bent portion 10 to the second straight portion 9.
Plate supporting recess 20 for engaging and supporting the other side edge of each of the step plates 6, 7, 3 and the other side edge of the step plate 5
And a kick plate support recess 21 for engaging and supporting the other side edge of the kick plate 19 provided between the step plates 5, 6, 7, and 3. As shown in FIG. 3 (c), the third side spar 14 is a step supporting recess 20 for engaging and supporting one side edge of each of the steps 4 and 5 of the bent portion 10. And each plate 4,5
A kick plate supporting recess 21 is provided for engaging and supporting one side edge of the kick plate 19 provided therebetween. 16 square
As shown in FIG. 3 (d), a step which engages and supports the other side edge of each of the step plates 4, 5 of a part of the bent portion 10 in opposition to the third side spar 14, The plate supporting recess 20 and each of the step plates 4 and 5
A kick plate support recess 21 is provided for engaging and supporting the other side edge of the kick plate 19 provided therebetween.

Each of the side girders 15, 17, 14 and the square building 16 shown in FIGS. 3 (a) to 3 (d) has one vertical surface opposite to the illustrated vertical surface (not shown). The middle and back sides also have the step board supporting recess 20 and the riser board supporting recess 2.
1 and a step board supporting recess and a riser supporting recess of the same shape are provided at the same position as 1. Thus, when the right-turn staircase 1 shown in FIG. 1A is formed, FIGS.
The step boards 4, 5, 6, 7, and 3 are formed by the step board support recess 20 and the riser board support recess 21 on one of the illustrated vertical surfaces of the side girders 15, 17, 14 and the square 16 shown in FIG. Supported. When forming the left-turn staircase 2 shown in FIG. 1 (b), the respective side girders 15, 1 shown in FIGS. 3 (a) to 3 (d) are used.
The step boards 4, 5, 6, 7, and 3 are supported by the step board support recesses and the riser board support recesses on the other vertical surface of the building 7, 14 and the square building 16.

As shown in FIG. 3 (e), the first side girders 12 are stepped plate supporting recesses for engaging and supporting one side edge of each stepped plate 3 of the first linear portion 8. 20 and a kick plate support concave portion 21 that engages and supports one edge of the kick plate 19 provided between the step plates 3. Similarly, the second side girders 13 are provided so as to face the first side girders 12, and as shown in FIG. Step plate supporting recess 20 for engaging and supporting a side edge
And a kick plate support concave portion 21 that engages and supports the other side edge of the kick plate 19 provided between the step plates 3. Each of the step boards 3 disposed on the first linear portion 8 has a symmetrical shape in the left and right direction. Therefore, the first side beam 12 and the second side beam 13 are provided with the step board supporting recesses 20 and Riser support recess 21
Can be used in common for both the right-handed staircase 1 shown in FIG. 1A and the left-handed staircase 2 shown in FIG. 1B.

As described above, the curved stairs A of the present embodiment
Since the step plates 4, 5, 6, and 7 arranged in the bent portion 10 have the same finish processing on one horizontal plane and the other horizontal plane, the respective step boards 4, 5, 6, Even if 7 has a left-right asymmetric shape, as shown in FIGS. 2 (a) and 2 (b),
By simply reversing according to the bending direction, either the left or right bending section 1
Even if it is 0, it can be easily formed. Further, FIG.
Each of the side girders 15, 17, 14 and the square building 16 shown in (a) to FIG. 3 (d) is provided with a step board supporting concave portion 20 and a kick plate supporting concave portion 21 of the same shape at the same position on both vertical surfaces. Therefore, any of the right-handed staircase 1 shown in FIG. 1A and the left-handed staircase 2 shown in FIG. 1B can be easily formed. Since the right-turn staircase 1 and the left-turn staircase 2 are shared, for example, when precutting and storing at a factory, it is not necessary to store both the right-turn staircase 1 and the left-turn staircase 2 separately. Thus, the inventory space can be reduced.

Next, another embodiment will be described. According to the design of the wooden house, the curved staircase B of another embodiment is a right-turned staircase 22 that rises while turning 90 ° rightward as shown in FIG. 4A, and as shown in FIG. 4B. 90 ° to the left
It is possible to selectively form the left-handed stairs 23 that go up while bending.

As shown in FIG. 4 (a), the right-turn stairs 22 are provided with a plurality of step plates 3 each having a symmetrical shape (rectangular shape in plan view).
(The shapes are the same), and four step plates 4, 5, 6, and 7 having an asymmetric shape in the left-right direction. The left and right asymmetric step plates 4, 5, 6, and 7 are disposed at the bent portion 10 on the up start side, and the left and right symmetric step plate 3 is disposed at the straight portion 24 following the bent portion 10 and up to the end. Is established. The bending part 1
In the lower part of 0, a single step board 25 for starting to ascend is provided. The same as in the above-described embodiment is used as each of the symmetric step plates 3 and the left and right asymmetric step plates 4, 5, 6, and 7. That is, the asymmetric step plates 4, 5, 6, 7
The same finishing is applied to each of the upper and lower horizontal planes, and the left-right symmetric step board 3 is subjected to finishing only to one horizontal plane.

The step plates 4 and 5 of the bent portion 10 have one side edge on the outer peripheral side in the bending direction supported by the first side girders 26.
The other side edge on the inner peripheral side in the bending direction is supported by the square building 27. Step plates 5, 6, of the bent portion 10 and the straight portion 24
The outer peripheral side of each of the outer peripheral sides 7 and 3 is supported by the second lateral girder 28, and the inner peripheral side of the other peripheral side is supported by the third lateral girder 29.

The step board 25 for starting to ascend has one side edge supported by a first side beam 26 and the other side edge supported by a square building 27. In addition, each step board 25, 4, 5, 6,
A riser plate (not shown) (see the riser plate 19 of the curved staircase A described in the above embodiment) is provided between 7, 7. Further, although not shown, the side girders 26 and 28 are integrally fixed to the interior wall of the staircase, and the side girders 29 and the square building 27 are integrally fixed to the partition wall of the staircase.

Then, the left-turn stairs 23 shown in FIG.
Is different from the right-turning stairs 22 shown in FIG. 4A in the bending direction of the bending portion 10, but each of the step plates 25, 4, 5, 6, 7, 3,
Each of the side girders 26, 28, and 29 is the same as the right-turn staircase 22.

As shown in FIG. 5A, the second side girder 28 engages one side edge of each of the step plates 5, 6, 7, 3 from the bent portion 10 to the straight portion 24. Plate supporting concave portion 20 for supporting the same, and a kick plate supporting concave portion 21 for engaging and supporting one side edge of a kick plate provided between each of the step plates 5, 6, 7, and 3.
And The third side girder 29 faces the second side girder 28 as shown in FIG.
A step supporting recess 20 for engaging and supporting the other side edge of each of the step plates 6, 7, 3 and a part of the other side edge of the step plate 5 from the to the straight portion 24; A kick plate support recess 21 is provided between the plates 5, 6, 7, and 3 for engaging and supporting the other side edge of the kick plate. The first side girder 26 is shown in FIG.
As shown in (c), the step board supporting recess 2 which engages and supports one side edge of each of the step boards 4 and 5 of the bent portion 10.
0, and a kick plate support concave portion 21 that engages and supports one side edge of the kick plate provided between the step plates 4 and 5. As shown in FIG. 5 (d), the square building 27 faces each of the first side girders 26 and a part of each of the step plates 4, 5 of the bent portion 10.
A plate supporting recess 20 for engaging and supporting the other side edge,
A kick plate support recess 21 is provided between the step plates 4 and 5 to engage and support the other edge of the kick plate on the other side.

Each of the side girders 28, 29, and 26 shown in FIGS. 5A to 5C has one vertical surface opposite to the illustrated vertical surface (the back side in the drawing (not shown)). In both cases, a step board support recess and a riser board support recess of the same shape are provided at the same position as the step board support recess 20 and the riser board support recess 21. Thereby, the right-turn staircase 2 shown in FIG.
5 is formed by the step board supporting concave portion 20 and the riser plate supporting concave portion 21 on one of the illustrated vertical surfaces of the side girders 28, 29, 26 shown in FIGS. 5 (a) to 5 (c). Step plates 4, 5, 6, 7, 3 are supported. When the left-turn stairs 23 shown in FIG. 4B are formed, the other vertical surfaces of the side girders 28, 29 and 26 shown in FIGS. The step plates 4, 5, 6, 7, and 3 are supported by the concave portions and the kick plate supporting concave portions.

A support step 30 for supporting the step board 25 for starting climbing is formed on the lower side of the square building 27, and a kick plate (not shown) is provided at the tip of the support step 30. Another riser plate support concave portion 31 for supporting is formed. The other riser plate support recesses 31 may be provided on both vertical surfaces of the square building 27, but one side of the support step 30 extends outside the partition wall of the staircase (not shown). Therefore, it is preferable that the other riser plate support concave portion 31 is provided on one of the vertical surfaces depending on the bending direction, or is formed at a construction site. Furthermore,
In the step board 25 for starting to ascend, by performing the same finishing process on both upper and lower horizontal planes, both the left and right curved stairs 22 and 23 can be provided inverted.

As described above, the curved staircase B of another embodiment
Since the step plates 4, 5, 6, and 7 arranged in the bent portion 10 have the same finish processing on one horizontal plane and the other horizontal plane, the respective step boards 4, 5, 6, Even if 7 has a left-right asymmetric shape, as shown in FIGS. 4 (a) and 4 (b),
By simply reversing according to the bending direction, either the left or right bending section 1
Even if it is 0, it can be easily formed. Further, FIG.
(A) to each side girder 28, 29, 26 shown in FIG.
Are provided at the same position on both vertical surfaces in the stepped support recesses 20 of the same shape.
4 and the riser support recess 21 are provided.
Any of the right-handed stairs 22 shown in FIG. 4A and the left-handed stairs 23 shown in FIG. 4B can be easily formed. Then, except for at least the square building 27, the right-turning stairs 22 and the left-turning stairs 23 are commonized. For example, when precut and stored in a factory, both the right-turning stairs 22 and the left-turning stairs 23 are used. There is no need to store them separately, and the inventory space can be reduced.

In each of the above-described embodiments, the stepped plates 4, 5, 6, and 7 having asymmetrical shape on the left and right sides have finished both flat horizontal surfaces. In this case, although not shown, a concave groove for mounting the riser plate 19 is machined at the construction site along the nose of the horizontal plane which is a lower side when the bending section 10 is disposed. Although not shown, at the time of pre-cutting at the factory, relatively shallow grooves for preventing slippage may be formed along both sides of the step nose on both horizontal surfaces of the step plates 4, 5, 6, and 7 having asymmetric shapes. . Also in this case, a concave groove for mounting the riser plate 19 is machined at the construction site along the nosing of the horizontal plane, which is the lower side when arranging the bent portion 10.

Further, left and right asymmetric step plates 4, 5, 6,
7A and 7B, concave grooves 33 and 34 of the same shape are formed at the same position along the step nose 32 on both horizontal planes, as shown in FIG. 6A and FIG. May be. 6 (a) shows a case where one horizontal surface of the step board 4 is used as a tread surface, and FIG. 6 (b) shows a case where the step plate 4 of FIG. 6 (a) is inverted and the other horizontal surface is used as a tread surface. Is shown.
The concave grooves 33 and 34 are formed in a shape in which the non-slip member 35 (for example, made of rubber) and the kick plate 19 can be mounted at the time of pre-cutting at the factory. Then, as shown in FIG. 6A, when one of the horizontal surfaces of the step board 4 is used as a tread surface, the non-slip member 35 is attached to the upper groove 33 exposed as the tread surface, and the lower groove is provided. The riser 19 is attached to 34. On the other hand, as shown in FIG. 6B, when the step plate 4 is turned over and the other horizontal surface is used as a tread surface, the non-slip member 35 is attached to the concave groove 34 set to the upper side, and The kick plate 19 is mounted in the concave groove 33. By doing so, the double concave grooves 33, 34 can be accurately provided at the time of pre-cutting at the factory, and moreover, at the construction site, the double concave grooves 33, 34 are provided.
Since it is possible to save time and labor for processing 34, not only the assembling work of the curved stairs A and B becomes easy, but also the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing a curved staircase according to an embodiment.

FIG. 2 is an explanatory perspective view of a part of a curved portion in the curved staircase of the embodiment.

FIG. 3 is an explanatory side view of a side girder employed in a curved staircase of the embodiment.

FIG. 4 is an explanatory plan view showing a curved staircase according to another embodiment.

FIG. 5 is an explanatory side view of a side beam used in a curved staircase according to another embodiment.

FIG. 6 is an explanatory perspective view showing one of the step boards provided in the bent portion.

[Explanation of symbols]

A, B: curved stairs, 1, 22 ... right-turned stairs, 2, 23 ...
Left-turn staircase, 3 ... symmetric step board, 4, 5, 6, 7
... Asymmetrical step boards, 8, 9, 24 ... Linear parts, 10
... bends, 14, 15, 17, 26, 28, 29 ... side girders, 19 ... riser plate, 20 ... step board support recess (assembly recess), 32 ... step nose, 33, 34 ... groove, 35 ... slide Stop member.

Claims (5)

[Claims] 1. A curved staircase comprising a straight portion provided with a symmetrical step board and a curved portion provided with a left-right asymmetrical step board, wherein the left-right asymmetrical step board has a curved portion. One horizontal surface that becomes the upper surface when the direction is disposed in the rightward bent portion has been subjected to finish processing that can be used as a tread surface, and the stepped plate is reversed and the bending direction is the leftward bent portion. A curved staircase, characterized in that the same horizontal plane as the one horizontal plane has been subjected to the same finishing processing as the other horizontal plane which is to be the upper surface when disposed on the staircase. 2. The left-right asymmetrical step board has a concave groove of the same shape on both horizontal planes along the nose, and the concave groove of one horizontal plane selected as the tread surface is a mounting groove for a non-slip member. 2. The curved staircase according to claim 1, wherein the concave groove on the other horizontal plane is a connecting groove of the riser. 3. A curved staircase including a straight portion provided with a symmetrically shaped step plate and a curved portion provided with a left-right asymmetrically shaped step plate, wherein at least each of the step plates constituting the bent portion The side girders provided on both sides of the side plate and supporting the side edge portions of the respective step boards are provided with one side edge of each step board disposed in the bent section when the bending direction of the bent section is the right direction. When an assembling concave portion for assembling and supporting the portion is formed on one of the vertical surfaces, and when the bending direction of the bent portion is the left direction, the other end of each step board disposed in the bent portion A curved staircase, wherein an assembling recess for assembling and supporting an edge is formed in the other vertical surface. 4. A step board having a left-right asymmetrical shape disposed at a curved portion of a curved staircase, wherein the step board has the same finishing work that can be used as a tread on both upper and lower horizontal planes. When the horizontal surface is positioned on the upper surface and the tread surface is used, the bending direction forms a rightward bent portion, and when the step surface is inverted and the other horizontal surface is positioned on the upper surface and the tread surface is used, the bending direction is the left direction A curved plate of a curved staircase, wherein the curved portion forms a curved portion. 5. The step board has a concave groove of the same shape in both horizontal planes along the step nose, the concave groove of one horizontal plane which is a tread surface is a mounting groove for a non-slip member, and the groove of the other horizontal plane is formed. 5. The step board of a curved staircase according to claim 4, wherein the concave groove is a connecting groove of the riser.