JP6752188B2 - Construction method of stairs, stair components and stairs - Google Patents

Description

The present invention relates to a staircase preferably installed in a detached house or the like in which a tread plate and a riser plate are assembled between a pair of side plates, a member constituting the staircase, and a method of constructing the staircase.

In an indoor staircase installed in a detached house or the like, side plates that support the treads and risers on their sides are arranged in parallel with each other, and a plurality of treads and risers are assembled between these pair of side plates. .. In such a staircase, a tread plate accommodating groove extending horizontally and opening toward the rear of the stairs and a riser plate accommodating groove extending vertically and opening downward are provided on the inner surface facing the side plates. It is formed. When constructing such a staircase at a construction site, the end of the tread plate is inserted into the tread plate accommodating groove of the side plate from the rear of the stairs toward the front, and the tread plate accommodating groove of the side plate is kicked from below the staircase. The end of the plate was inserted upward, and the tread plate and riser plate were assembled to the side plate.

However, when assembling the lowermost (first from the bottom) riser plate to the side plate, the open portion on the lower end side of the riser plate accommodating groove is blocked by the floor surface, so the above-mentioned simple method is used. The end of the riser plate cannot be inserted into the riser plate accommodating groove. For example, the lower ends of the pair of side plates are once lifted from the floor surface, and in this state, the riser plate is inserted into the riser plate accommodating groove from below. Troublesome work was done, such as doing.

In response to such a problem, in Patent Document 1 below, the front side communicates with the riser plate mounting groove behind the riser plate mounting groove (kick plate accommodating groove) on the inner side surface of the side plate, and the rear side opens toward the rear. By forming a work groove and guiding the end of the riser plate from the rear on the back side of the stairs to the riser plate mounting groove through the work groove, the end of the riser plate is accommodated and arranged in the riser plate mounting groove. The points made are disclosed.
The one described in Patent Document 1 allows the end portion of the lowermost riser plate to be accommodated in the riser plate mounting groove without lifting the side plate, but when the riser plate is inserted into the work groove. Regarding the work of assembling the riser board, such as the work area is limited to the vicinity of the floor surface behind the stairs, and the tread board must be placed directly above the riser board prior to insertion, making it difficult to see the riser board. There was still room for improvement.

Japanese Unexamined Patent Publication No. 2006-299630

Against the background of the above circumstances, the present invention even if the lower end side of the groove to be accommodated is blocked by a floor surface or the like, such as a riser plate located at the bottom (first step from the bottom). It is an object of the present invention to provide a staircase, a staircase component, and a method for constructing a staircase, in which such a riser plate can be easily assembled between a pair of side plates.

Therefore, claim 1 is a method of constructing a staircase in which a tread plate and a riser plate connected to the tread plate are assembled between a pair of side plates.
On the inner side surface of each of the pair of side plates, a first tread plate accommodating groove extending horizontally and opening rearward to accommodate the end portion of the tread plate,
The upper end is communicated with the first tread plate accommodating groove to form a first riser plate accommodating groove for accommodating the end portion of the riser plate.
At least one of the side plates is dug down from the bottom surface of the first riser plate accommodating groove, straddling the first riser plate accommodating groove and the first tread plate accommodating groove, and the end portion of the riser plate is formed. An opening is formed so that it can be inserted deeper than the bottom surface.
When assembling the riser plate between the pair of side plates arranged parallel to each other,
With one end of the riser inserted into the opening, the riser is rotated around the one end, and the other end of the riser is inserted into the first riser accommodating groove. It is characterized in that both ends of the riser plate are accommodated in the first riser plate accommodating groove by moving one end portion of the riser plate to a facing position and then pulling out one end portion of the riser plate from the opening.

When the end of the riser plate is accommodated and arranged in the riser plate accommodating groove formed on the inner side surface of the side plate, the length of the riser plate is equal to the predetermined amount of the hooking allowance with respect to the distance between the inner side surfaces of the opposite side plates. Normally, it is difficult to fit the riser plate into the accommodating groove from the front side of the stairs because of the length, but in the present invention, one end of the riser plate is inserted into the first riser plate accommodating groove of one side plate. By inserting it into the opening formed in, the other end of the riser plate can be moved further inward than the inner side surface of the side plate, so that the riser plate can be moved while avoiding interference with the inner side surface of the side plate. The other end can be moved to a position facing the first riser plate accommodating groove, and both ends of the riser plate can be accommodated in the first riser plate accommodating groove.
That is, according to the construction method of the present invention, even when the lower end side of the groove to be accommodated is blocked by a floor surface or the like, such as a riser plate located at the lowest stage (first stage from the bottom), the work area is widened. It is possible to easily assemble a riser plate such as the lowest stage from the front side of the stairs (and in some cases from the back side of the stairs) between the pair of side plates without being limited to the vicinity of the floor surface on the back side of the stairs.

According to a second aspect of the present invention, the front wall of the first riser plate accommodating groove is formed in the vertical direction, and the rear wall facing the front wall is arranged along the rear wall. In order to prevent the upper end of the riser plate from protruding into the first tread plate accommodating groove, the riser plate is inclined in a direction away from the front wall as it advances upward.
The riser plate accommodated in the first riser plate accommodating groove is placed along the rear wall, and the front end of the tread plate inserted into the first tread plate accommodating groove is passed directly above the riser plate. After that, the tread plate and the riser plate are connected to each other.

In this way, if the riser plate is first accommodated in the accommodating groove prior to the tread plate directly above, the workability of assembling the riser plate can be improved. Further, it is possible to satisfactorily prevent the interference between the riser plate first accommodated in the accommodating groove and the tread plate immediately above the riser plate accommodating in the accommodating groove later.

A third aspect of the present invention relates to a staircase component, which includes a first tread plate accommodating groove extending horizontally and opening rearward to accommodate an end portion of the tread plate on an inner surface surface.
A staircase component including a pair of side plates formed with a first riser plate accommodating groove having an upper end communicating with the first tread accommodating groove and accommodating an end portion of the riser plate.
At least one of the side plates is dug down from the bottom surface of the first riser plate accommodating groove, straddling the first riser plate accommodating groove and the first tread plate accommodating groove, and the end portion of the riser plate is formed. It is characterized in that an opening is formed so that it can be inserted deeper than the bottom surface.

By using such a staircase component, according to the construction method of claim 1, the work area is not limited to the vicinity of the floor surface on the back side of the stairs, and the riser plate such as the bottom step is placed on a pair of sides from the front side of the stairs. It can be easily assembled between the boards.

According to a fourth aspect of the present invention, the front wall of the first riser plate accommodating groove is formed in the vertical direction, and the rear wall facing the front wall forms the riser plate along the rear wall. It is characterized in that the upper end portion of the riser plate is inclined in a direction away from the front wall as it advances upward so as not to protrude into the first tread plate accommodating groove when it is arranged.
If such a staircase component is used, the riser plate can be first accommodated in the accommodating groove prior to the tread plate directly above by the construction method according to claim 2, thereby improving the workability of assembling the riser plate. Can be done.

Claim 5 is a staircase in which a tread plate and a riser plate connected to the tread plate are assembled between a pair of side plates.
On the inner side surface of each of the pair of side plates, a first tread plate accommodating groove extending horizontally and opening rearward to accommodate the end portion of the tread plate,
The upper end is communicated with the first tread plate accommodating groove, and a first riser plate accommodating groove accommodating the end portion of the riser plate is formed.
At least one of the side plates is dug down from the bottom surface of the first riser plate accommodating groove, straddling the first riser plate accommodating groove and the first tread plate accommodating groove, and the end portion of the riser plate is formed. It is characterized in that an opening is formed so that it can be inserted deeper than the bottom surface.

In the case of such a staircase, according to the construction method of claim 1, the work area is not limited to the vicinity of the floor surface on the back side of the stairs, and a riser plate such as the lowest stage is placed between the pair of side plates from the front side of the stairs. It can be easily assembled.

According to a sixth aspect of the present invention, the front wall of the first riser plate accommodating groove is formed in the vertical direction, and the rear wall facing the front wall forms the riser plate along the rear wall. It is characterized in that the upper end of the riser plate is inclined in a direction away from the front wall as it advances upward so that the upper end of the riser plate does not protrude into the first tread plate accommodating groove when arranged.

In the case of such a staircase, the workability of assembling the riser plate can be improved by first accommodating the riser plate in the accommodating groove prior to the tread plate directly above by the construction method of claim 2. ..

It is a perspective view which showed the stairs of one Embodiment of this invention. It is the figure which showed the cross section passing through the center of the stairs in the left-right direction. It is the figure which showed the tread plate and the riser plate in a separated state. (A) is a figure which showed the shape of the groove formed on the inner side surface of a side plate. (B) is a cross-sectional view corresponding to the BB portion of (A). (A) is a figure which showed the state which the tread plate was accommodated in the 1st tread plate accommodating groove. FIG. (B) is a diagram showing a state in which the riser plate is accommodated in the first riser plate accommodating groove. (A) is a figure which showed the state which the tread plate was accommodated in the 2nd tread plate accommodating groove. FIG. (B) is a diagram showing a state in which the riser plate is accommodated in the second riser plate accommodating groove. It is explanatory drawing which shows the construction procedure of the stairs of FIG. It is explanatory drawing which shows the construction procedure following FIG. It is explanatory drawing which shows the construction procedure following FIG. It is explanatory drawing which shows the construction procedure following FIG. It is explanatory drawing which shows the construction procedure following FIG. It is explanatory drawing which shows the construction procedure following FIG. It is a figure which showed the main part which concerns on the stairs of the reference example different from this invention. It is explanatory drawing which shows the assembling procedure of the lowermost riser plate in a reference example.

Next, an embodiment of the present invention will be described in detail below with reference to the drawings.
In FIG. 1, reference numeral 10 denotes a wooden box-shaped staircase (hereinafter, simply referred to as “staircase”), which is provided between a pair of left and right side plates 12 and 12 arranged in parallel with each other and a pair of side plates 12 and 12. A plurality of tread plates 14 and riser plates 16 are provided.

As shown in FIGS. 1 and 2, each side plate 12 has a floor installation surface 23 mounted on the floor surface F on the lower floor and a lower end portion 20 having a front vertical surface 24 rising vertically from the floor installation surface 23. And an upper end portion 22 connected to the upper floor side constituent member 18. The inner side surface 26 and the outer side surface 28 of the side plate 12 extending from the lower end portion 20 to the upper end portion 22 are formed of flat surfaces, and the plate thickness between them is substantially constant. Each side plate 12 is fixed to a structure 19 such as a wall in contact with the outer surface 28 by a fixture such as a nail (not shown).

As shown in FIG. 3, the tread plate 14 has a square plate shape and is arranged between the side plates 12 and 12 in a substantially horizontal direction, and the upper surface 30 thereof is a tread surface. On the lower surface 32 side of the tread plate 14, a fitting groove 36 extending in the longitudinal direction (left-right direction) is formed in the vicinity of the front end 34.

As shown in FIG. 3, the riser plate 16 has a thickness thinner than that of the tread plate 14 and has a square plate shape. By fitting the upper end portion 40 of the riser plate 16 into the fitting groove 36 formed in the lower surface 32 of the tread plate 14, the tread plate 14 and the riser plate 16 can be connected at a right angle. As shown in FIGS. 1 and 2, the riser plate 16 is located below each tread plate 14 in a state of being assembled to the side plate 12 together with the tread plate 14, and hides the back surface side of the stairs 10.

In this example, the width dimension W _{1 in} the left-right direction of the tread plate 14 and the width dimension W _{2 in} the left-right direction of the riser plate 16 have the same width dimension, and the tread plate 14 and the riser plate 16 are connected to each other. , The left-right end surface 38 of the tread plate 14 and the left-right end surface 42 of the riser plate 16 are configured to be flush with each other.

FIG. 4A is a diagram showing the shape of the groove formed on the inner side surface 26 of the side plate 12. When the pair of side plates 12 and 12 are arranged in parallel, the tread plate accommodating groove 44 and the riser plate accommodating groove 52 accommodating the respective ends of the tread plate 14 and the riser plate 16 are provided on the inner side surfaces 26 which are facing surfaces. It is formed mirror-symmetrically. In this example, the tread plate accommodating groove corresponding to the tread plate 14 located at the first step from the bottom is the first tread plate accommodating groove 44A, and the other tread plate accommodating groove corresponding to the tread plate 14 located at the second step or higher from the bottom is provided. The second tread plate accommodating groove 44B is used, and the riser plate accommodating groove corresponding to the riser plate 16 located in the first step from the bottom is located in the first riser plate accommodating groove 52A, and other than that, in the second step or higher from the bottom. The riser plate accommodating groove corresponding to the riser plate 16 is referred to as a second riser plate accommodating groove 52B.

The first tread accommodating groove 44A has a rear open edge 48 that opens rearward on the back side of the upper wall 45, the lower wall 46, the front wall 47, and the stairs 10, and the inner surface surface in the area surrounded by these. A bottom surface 49 having a predetermined depth is formed with respect to 26. The first tread plate accommodating groove 44A extends in a substantially horizontal direction with the side plate 12 installed on the floor surface so that the end portion of the tread plate 14 can be inserted forward from the rear open edge portion 48. It is configured.

The lower wall 46 of the first tread accommodating groove 44A is inclined diagonally downward as it advances backward, and as shown in FIG. 2, the tread 14 inserted into the first tread accommodating groove 44A. By pushing the wedge member 65 between the lower surface 32 and the lower wall 46, the upper surface 30 of the tread 14 housed in the first tread accommodating groove 44A is pressed against the upper wall 45 to fix the tread 14. .. In some cases, the first tread accommodating groove 44A may be formed in a parallel groove having the same dimension width as the thickness t ₁ of the tread 14 (see FIG. 3), and the wedge member 65 may be omitted.

FIG. 5A is a diagram showing a state in which the tread plate 14 located in the first step from the bottom is housed in the first tread plate accommodating groove 44A. As shown in the figure, the movement of the inserted tread plate 14 in the left-right direction is restricted by the bottom surface 49 of the first tread plate accommodating groove 44A facing the end surface 38 of the tread plate 14. Further, the forward movement of the tread plate 14 is regulated by the front wall 47 of the first tread plate accommodating groove 44A, and a hooking allowance S ₁ is set between the tread plate 14 and the front wall 47 of the first tread plate accommodating groove 44A. Will be done.

As shown in FIG. 4A, the first riser plate accommodating groove 52A communicates with the front wall 53 extending in the vertical direction, the rear wall 54 facing the anterior wall 53, and the first tread accommodating groove 44A directly above. It has an upper communication edge portion 55 and a lower open edge portion 56 that opens downward, and a bottom surface 57 having a predetermined depth is formed with respect to the inner side surface 26 in a region surrounded by these. In this example, the bottom surface 57 has the same depth as the bottom surface 49 of the first tread accommodating groove 44A that communicates with the bottom surface 57.

The rear wall 54 facing the front wall 53 is inclined obliquely backward by an angle α from the imaginary line in the vertical direction, that is, in a direction away from the front wall 53 as it advances upward. The inclination α is set so that the length L ₁ from the lower end to the upper end of the rear wall 54 is longer than the height h ₂ of the riser plate 16 (see FIG. 3). As a result, the groove width of the first riser plate accommodating groove 52A defined by the front wall 53 and the rear wall 54 is the groove width W ₃ of the lower open edge portion 56 and the plate thickness t _{2 of the} riser plate 16. (See FIG. 3), on the other hand, the groove width W ₄ of the upper communication edge portion 55 is set to be slightly larger than the groove width W ₃ .

The rear wall 54 may be formed at an inclination so that the upper end 40 of the riser plate 16 does not protrude into the first tread plate accommodating groove 44A when the riser plate 16 is arranged along the rear wall 54. The rear wall 54 of this example extends linearly to the upper end with a constant inclination, but the inclination may be changed at a position on the way to the upper end, or the inclination angle may be gradually changed to form a curved shape. It is possible.

FIG. 5B is a diagram showing a state in which the riser plate 16 located in the first stage from the bottom is accommodated in the first riser plate accommodating groove 52A. The left-right movement of the riser plate 16 arranged at a predetermined position close to the front wall 53 is regulated by the bottom surface 57 of the first riser plate accommodating groove 52A facing the left-right end surface 42 of the riser plate 16. There is. Further, the forward movement of the riser plate 16 is regulated by the front wall 53 of the first riser plate accommodating groove 52A, and a hooking allowance S ₂ is formed between the riser plate 16 and the front wall 53 of the riser plate accommodating groove 52A. Set. In this example, the hooking allowance S ₂ of the riser plate 16 is set to have the same dimensions as the hanging allowance S ₁ of the tread plate 14.

Further, as shown in FIG. 4A, in this example, the opening 60 is formed across the first riser plate accommodating groove 52A and the first tread plate accommodating groove 44A. The opening 60 has a substantially elongated square shape when viewed from the front, the width of the opening 60 in the longitudinal direction is larger than the height h ₂ of the riser plate 16, and the width of the opening 60 in the lateral direction is the riser plate. The plate thickness is set to be larger than t _{2 of} 16, and the opening shape is such that one end of the riser plate 16 can be inserted. Similar to the rear wall 54, the opening 60 is inclined obliquely rearward as it goes upward, and is formed at a position close to the rear wall 54.

As shown in FIG. 5, in this example, the opening 60 is formed only on one side plate 12A, but instead, it can be formed only on the other side plate 12B, or both 12A and 12B. It is also possible to form an opening 60 in the side plate of the. Further, the opening 60 of this example is formed as a through hole penetrating the side plate 12A in the plate thickness direction, but in some cases, it can be formed as a bottomed concave hole.

Next, the second tread accommodating groove 44B corresponding to the tread 14 located at the second step or higher from the bottom is the upper wall 45, the lower wall 46, the front wall 47, and the stairs 10 as shown in FIG. 4 (A). On the back surface side, there is a rear side open edge portion 48 that opens rearward, and a bottom surface 49 having a predetermined depth is formed with respect to the inner side surface 26 in the area surrounded by these. The second tread plate accommodating groove 44B extends in a substantially horizontal direction, and is configured so that the end portion of the tread plate 14 can be inserted forward from the rear open edge portion 48. That is, the second tread accommodating groove 44B has a groove shape similar to that of the first tread accommodating groove 44A. Note that FIG. 6A shows a state in which the tread plate 14 is housed in the second tread plate accommodating groove 44B.

Further, as shown in FIG. 4A, the second riser plate accommodating groove 52B corresponding to the riser plate 16 located at the second stage or higher from the bottom is a front wall 53, a rear wall 54, both of which extend in the vertical direction. It has an upper communication edge 55 that communicates with the second tread accommodating groove 44B directly above, and a lower open edge 56 that is open downward, and a bottom surface having a predetermined depth with respect to the inner surface 26 in the area surrounded by these. 57 is formed. Unlike the first riser plate accommodating groove 52A, the second riser plate accommodating groove 52B is formed as a parallel groove, and the groove width W ₅ defined by the front wall 53 and the rear wall 54 is the riser plate. The thickness of the riser plate 16 is set to be slightly larger than t ₂ so that the 16 can be inserted. Note that FIG. 6B shows a state in which the riser plate 16 is accommodated in the second riser plate accommodating groove 52B.

Next, the construction method of the stairs 10 will be described.
(A) A pair of side plates 12 and 12, a plurality of tread plates 14 and a riser plate 16 which are staircase constituent members are prepared. In order to improve on-site assembly workability, it is preferable to use each staircase component that has been processed into a predetermined shape at the factory before it is brought into the site, but in some cases, it is processed after it is brought into the site. It is also possible.
(B) Next, the pair of side plates 12, 12 are placed on the floor surface F so as to be parallel to each other, and fixed to a structure such as a wall.

(C) Next, the tread plate 14 and the riser plate 16 at the bottom (first stage from the bottom) are attached. As shown in FIG. 7 (A), one end 61 of the riser plate 16 was inserted into the first riser plate accommodating groove 52A of the left side plate 12A in the drawing in which the opening 60 was formed from the front side of the stairs. After that, as shown in FIG. 7B, one end 61 is inserted into the opening 60. Specifically, one end 61 of the riser plate 16 is inserted into the opening 60 to a depth at which the other end 62 of the riser plate 16 is inside the inner side surface 26 of the side plate 12B. After that, as shown in FIG. 7B, the riser plate 16 is rotated around one end portion 61, and the other end portion 62 is set to the first side plate 12B on the right side in the drawing as shown by the alternate long and short dash line. The riser plate accommodating groove 52A is moved to a position facing it (see FIG. 7C). After that, as shown in FIG. 8, by pulling out one end 61 from the opening 60, both ends 61 and 62 of the riser plate 16 are accommodated in the first riser plate accommodating groove 52A, respectively. Then, as shown in FIG. 9, the riser plate 16 having both ends accommodated in the first riser plate accommodating groove 52A is held along the rear wall 54. At this time, in this example, since the length L ₁ from the lower end to the upper end of the rear wall 54 is longer than the height h _{2 of} the riser plate 16, the first tread accommodating groove 44A of the upper end portion 40 of the riser plate 16 The protrusion to the inside is prevented.

Next, as shown in FIG. 10A, the tread plate 14 is inserted from the rear side of the first tread plate accommodating groove 44A. Subsequently, as shown in FIG. 10B, the front end 34 of the tread plate 14 is passed directly above the riser plate 16, and then the upper end portion 40 of the riser plate 16 is fitted into the fitting groove 36 of the tread plate 14. , The tread plate 14 and the riser plate 16 are connected. Further, as shown in FIG. 11 (A), the tread plate 14 is moved forward while maintaining the connected state of the tread plate 14 and the riser plate 16, and the front end 34 of the tread plate 14 becomes the first tread plate accommodating groove 44A. It is moved to a predetermined position where it abuts on the front wall 47. At this time, the riser plate 16 rotates forward about the lower end portion 41 and is arranged at a predetermined position in contact with or close to the front wall 53 of the first riser plate accommodating groove 52A (FIG. 11 (B). )reference). Then, with the tread plate 14 and the riser plate 16 at predetermined positions, the wedge member 65 is inserted between the tread plate 14 and the lower wall 46 to fix the tread plate 14. The wedge member 65 is fixed to the side plate 12 with a fixing tool such as a nail (not shown) so as not to come off. As a result, the tread plate 14 and the riser plate 16 at the bottom (first stage from the bottom) are firmly fixed.

(D) Next, the tread plate 14 and the riser plate 16 on the second stage from the bottom are attached. As shown in FIG. 12 (A), the tread plate 14 is inserted from behind the second tread plate accommodating groove 44B formed in the side plate 12, and is moved to a predetermined position in contact with the front wall 47. Subsequently, a wedge member 65 is inserted between the tread plate 14 and the lower wall 46 of the second tread plate accommodating groove 44B from behind the second tread plate accommodating groove 44B (see FIG. 12B), and the tread plate 14 is fixed. To do. Next, as shown in FIG. 12 (C), the riser plate 16 is inserted from below on the back side of the stairs so as to match the second riser plate accommodating groove 52B formed in the side plate 12. Then, the upper end portion 40 of the riser plate 16 is fitted into the fitting groove 36 of the tread plate 14 directly above, and is erected so as to be in contact with the rear end surface of the lower tread plate 14, and is placed below the lower end portion 41 of the riser plate 16. The located tread plate 14 is fixed with a nail 67 from the back side of the stairs.

(E) The tread plate 14 and the riser plate 16 at the third and higher stages from the bottom can be assembled in the same procedure as in (d) above.

According to the stairs 10 of the present embodiment as described above, in a state where the pair of side plates 12 and 12 are placed on the floor surface F, the lowermost riser plate 16 is stairs without lifting the side plates 12 and 12. It can be accommodated in the first riser plate accommodating groove 52A from the front side of the above. The work area when accommodating the lowermost riser plate 16 in the first riser plate accommodating groove 52A is not limited to the vicinity of the floor surface on the back side of the stairs, and a pair of the lowermost riser plates 16 are paired from the front side of the stairs. It can be assembled between the side plates 12 and 12. In the above construction method, the lowermost riser plate 16 is assembled between the pair of side plates 12 and 12 from the front side of the stairs, but in some cases, the lowermost riser plate 16 is attached from the rear side (back side) of the stairs. It is also possible to assemble between the pair of side plates 12, 12.

Further, in the stairs 10 of the present embodiment, the rear wall 54 of the first riser plate accommodating groove 52A facing the front wall 53 is inclined in a direction away from the front wall 53 as it goes upward, and is along the rear wall 54. When the riser plate 16 is arranged, the upper end portion of the riser plate 16 is configured so as not to protrude into the first tread plate accommodating groove 44A. Therefore, in the stairs 10, the workability of assembling the lowermost riser plate 16 can be improved by first accommodating the lowermost riser plate 16 in the accommodating groove 52A prior to the tread plate 14 directly above. .. Further, it is possible to satisfactorily prevent the interference between the upper end portion 40 of the lowermost riser plate 16 housed in the accommodation groove 52A first and the tread plate 14 immediately above the riser plate 14 housed in the accommodation groove 44A later.

The embodiments of the present invention have been described in detail above, but this is merely an example. Although the stairs of the above embodiment constitute a straight staircase, the present invention can also be applied to a round staircase or a turn-back staircase whose direction is changed on the way. Further, in the above embodiment, the first riser plate accommodating groove 52A is applied to the lowermost stage, but for example, in a staircase having a structure in which a landing is provided at an intermediate position between the upper and lower floors, an intermediate position between the upper and lower floors is provided. In the above, it is possible to apply the configuration of the first riser plate accommodating groove 52A to the riser plate accommodating groove whose lower end side is blocked by the plate material constituting the landing, and various within the range not deviating from the purpose. It can be configured in a modified form.

Next, a reference example different from the present invention will be described. In this example, unlike the above embodiment, the lowermost riser plate 16 can be accommodated in the first riser plate accommodating groove 52A without using an opening. In the reference example, the components corresponding to the above-described embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 13 is a diagram showing the groove shape of the inner side surface 26 of the side plate 12 used for the stairs 70 of this reference example. The first riser plate accommodating groove 52A formed below the first tread accommodating groove 44A has a front wall 53 extending in the vertical direction and a rear wall 54 facing the front wall 53, as in the case of the stairs 10. It has an upper communication edge 55 that communicates with the first tread accommodating groove 44A directly above and a lower open edge 56 that is open downward, and a bottom surface having a predetermined depth with respect to the inner surface 26 in the area surrounded by these. 57 is formed. In this example, the bottom surface 57 has the same depth as the bottom surface 49 of the first tread accommodating groove 44A that communicates with the bottom surface 57.

The rear wall 54 facing the front wall 53 is inclined obliquely backward by an angle α from the imaginary line in the vertical direction, that is, in a direction away from the front wall 53 as it advances upward. Further, in this example, a notch 72 is formed at the upper end of the rear wall 54, and the groove width W ₄ at the upper communication edge 55 is widened.
The groove width W ₄ in the upper communication edge portion 55 is a groove width in which the riser plate 16 inserted into the first tread plate accommodating groove 44A can move into the first riser plate accommodating groove 52A through the upper communication edge portion 55. In other words, the riser plate 16 is set to have a groove width that allows the direction to be changed downward by approximately 90 °. If the riser plate 16 can be moved into the first riser plate accommodating groove 52A through the upper communication edge portion 55, the notch portion 72 can be abolished.

In the stairs 70 configured in this way, as shown in FIG. 14A, the end portion of the lowermost riser plate 16 is inserted from the rear open edge portion 48 of the first tread plate accommodating groove 44A to the tread plate accommodating groove. After being inserted into the 44A, the end portion of the riser plate 16 is changed in the vicinity of the upper communication edge portion 55 of the first riser plate accommodating groove 52A by changing the direction of the riser plate 16 so that the tip thereof faces downward. It can be accommodated in the riser plate accommodating groove 52A of No. 1 (see FIG. 14B). After that, the lowermost riser plate 16 can be assembled in the same procedure as in the case of the stairs 10.

According to the stairs 70, the side plates 12 and 12 are not lifted while the pair of side plates 12 and 12 are left on the floor surface F while using a simple structure in which the opening is not processed into the side plates 12. The lowermost riser plate 16 can be accommodated in the first riser plate accommodating groove 52A.
Further, since the lowermost riser plate 16 can be accommodated in the first riser plate accommodating groove 52A prior to the tread plate 14 directly above, the workability of assembling the lowermost riser plate 16 can be improved.

10 Stairs 12 Side plate 14 Tread plate 16 Rising plate 26 Inner side surface 34 Front end 40 Upper end 44A First tread plate accommodating groove 52A First riser plate accommodating groove 53 Front wall 54 Rear wall 57 Bottom surface 60 Opening 61 One end 62 The other end

Claims (6)

It is a construction method of stairs in which a tread plate and a riser plate connected to the tread plate are assembled between a pair of side plates.
On the inner side surface of each of the pair of side plates, a first tread plate accommodating groove extending horizontally and opening rearward to accommodate the end portion of the tread plate,
The upper end is communicated with the first tread plate accommodating groove to form a first riser plate accommodating groove for accommodating the end portion of the riser plate.
At least one of the side plates is dug down from the bottom surface of the first riser plate accommodating groove, straddling the first riser plate accommodating groove and the first tread plate accommodating groove, and the end portion of the riser plate is formed. An opening is formed so that it can be inserted deeper than the bottom surface.
When assembling the riser plate between the pair of side plates arranged parallel to each other,
In a state where one end of the riser plate is inserted into the opening, the riser plate is rotated around the one end portion, and the other end portion of the riser plate is inserted into the first riser plate accommodating groove. A staircase characterized in that both ends of the riser plate are accommodated in the first riser plate accommodating groove by moving one end portion of the riser plate to a facing position and then pulling out one end portion of the riser plate from the opening. Construction method. When the front wall of the first riser plate accommodating groove is formed in the vertical direction and the rear wall facing the front wall is arranged along the rear wall, the upper end portion of the riser plate is formed. In order not to protrude into the first tread accommodating groove, it is inclined in a direction away from the front wall as it advances upward.
The riser plate accommodated in the first riser plate accommodating groove is placed along the rear wall, and the front end of the tread plate inserted into the first tread plate accommodating groove is passed directly above the riser plate. The method for constructing stairs according to claim 1, wherein the tread plate and the riser plate are subsequently connected to each other. On the inner surface, a first tread accommodating groove that extends horizontally and opens rearward to accommodate the end of the tread,
A staircase component including a pair of side plates formed with a first riser plate accommodating groove having an upper end communicating with the first tread accommodating groove and accommodating an end portion of the riser plate.
At least one of the side plates is dug down from the bottom surface of the first riser plate accommodating groove across the first riser plate accommodating groove and the first tread plate accommodating groove, and the end portion of the riser plate is formed. A staircase component characterized by having an opening that allows it to be inserted deeper than the bottom surface. The front wall of the first riser plate accommodating groove is formed in the vertical direction, and the rear wall facing the front wall is the upper end portion of the riser plate when the riser plate is arranged along the rear wall. The staircase component according to claim 3, wherein the staircase component member is inclined in a direction away from the front wall as it advances upward so that the staircase does not protrude into the first tread plate accommodating groove. A staircase in which a tread plate and a riser plate connected to the tread plate are assembled between a pair of side plates.
On the inner side surface of each of the pair of side plates, a first tread plate accommodating groove extending horizontally and opening rearward to accommodate the end portion of the tread plate,
The upper end is communicated with the first tread plate accommodating groove, and a first riser plate accommodating groove accommodating the end portion of the riser plate is formed.
At least one of the side plates is dug down from the bottom surface of the first riser plate accommodating groove across the first riser plate accommodating groove and the first tread plate accommodating groove, and the end portion of the riser plate is formed. A staircase characterized by an opening that allows it to be inserted deeper than the bottom surface. The front wall of the first riser plate accommodating groove is formed in the vertical direction, and the rear wall facing the front wall is the upper end portion of the riser plate when the riser plate is arranged along the rear wall. The staircase according to claim 5, wherein the staircase is inclined in a direction away from the front wall as it goes upward so as not to protrude into the first tread accommodating groove.

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