JP7672129B2 - Staircase construction method and division unit for staircase construction - Google Patents

Description

The present invention relates to a staircase construction method for constructing stairs between left and right wall surfaces, and a staircase construction split unit that can be used in this construction method.

Stairs in wooden houses are generally
[1] Attach the upper frame.
[2] Mark out the left and right walls.
[3] Fix the side panels to the left and right walls.
[4] Fix the risers and treads to the left and right side panels, starting from the lower section to the upper section.
[5] Secure the baseboard.
It is constructed through the following steps.

However, the above construction is extremely time-consuming, as the dimensions of the treads and risers must be adjusted on-site. In addition, marking out each step is also time-consuming. Therefore, it takes a full day to a day and a half to construct a staircase with around 14 steps. In light of this reality, in the past, stairs have been constructed from multiple separate units manufactured in a factory.

For example, Patent Document 1 discloses a technique for constructing stairs by arranging multiple unit staircases (box-shaped split units) side by side. However, box-shaped split units like those in Patent Document 1 are large in size and are not easy to transport to the site or install. In particular, the split units in the upper section have a height that reaches from the first floor to the second floor. For this reason, depending on the conditions at the site, it may not be possible to transport or install the split units.

Patent Document 2 also discloses a technique for constructing stairs by connecting and fixing on-site boards (side boards) divided into multiple pieces to the left and right wall surfaces, and then fixing treads and risers to the left and right boards (side boards). However, with the construction method in Patent Document 2, because the treads and risers are fixed to the boards (side boards) one step at a time, adjustments on-site are still required. In fact, there is a risk that the amount of work on-site will increase due to the need to connect the boards (side boards).

Special Publication No. 52-029524 Publication No. 3202360

The present invention has been made to solve the above problems, and provides a staircase construction method that can significantly reduce on-site work, such as by eliminating the need to adjust the dimensions of the treads, risers, and side panels on-site, and can reduce the time and cost required to construct the stairs. Another object of the present invention is to provide a split unit for staircase construction that can be suitably used for this construction method.

The above issues are:
A method for constructing stairs between left and right wall surfaces, comprising:
The staircase is made up of several separate units, divided into upper and lower sections.
Each split unit is assembled in a factory from multiple steps, risers, and left and right side panels.
After fixing the rails to the left and right walls at an angle that matches the slope of the stairs,
This problem is solved by providing a staircase construction method characterized in that a plurality of split units are placed on the rail in order from the bottom up.

This eliminates the need to adjust the dimensions of the treads, risers, and side panels on-site. Also, marking only needs to be done at the locations necessary to determine the rail's inclination angle and position. This makes it possible to significantly reduce on-site work. Construction of stairs that previously took a full day to a day and a half can be completed in about two to three hours with the construction method of the present invention. This makes it possible to reduce the time and cost required for stair construction.

In the staircase construction method of the present invention, the treads, risers, and side panels that make up each split unit are usually made of wooden boards. This allows the split units to be fixed to the rails and each other by nailing or screws. Of the wooden boards, it is particularly preferable to use laminated lumber. This makes it possible to improve the dimensional accuracy of the treads, risers, and side panels. In addition, it also makes it possible to make the treads, risers, and side panels resistant to nailing or screws.

Here, the split units can be fixed to the rails by driving screws or nails from the underside of the rails. Split units can also be fixed to each other by driving screws or nails from the back side of the riser plate located at the bottom of one split unit, and fixing the riser plate to the end face of the tread plate located at the top of the other split unit located immediately below the first split unit.

In the construction method of the present invention for stairs, it is preferable to mount the split unit on the rail and then fix baseboards to the left and right of the split unit. This is because, in the construction method of the present invention, the split unit is inserted between the left and right wall surfaces, so the left and right width of the split unit needs to be narrower than the distance between the left and right wall surfaces. As a result, a gap will inevitably be formed between the split unit and the left and right wall surfaces, but this gap can be hidden by the baseboard.

In the staircase construction method of the present invention, it is preferable to form the rear corner of the side panel of at least one split unit into a rounded shape. This makes it easier for the rear corner of the side panel of the split unit to slide along the rail. Therefore, after the rear corner of the side panel of the split unit is placed against the rail, the split unit can be pushed up from below to slide the corner along the rail and move the split unit to the desired position. This makes it easier to place the split unit on the rail. This configuration is particularly preferable when used with the split unit arranged on the upper side.

In the staircase construction method of the present invention, it is also preferable to fix soundproofing materials to the outer surface of the side panels. This makes it possible to reduce the reverberation of sounds made when ascending and descending the stairs, thereby suppressing the generation of noise. The soundproofing materials may be attached on-site, but if they are attached when the split units are assembled in a factory, the amount of work on-site can be reduced.

In addition, the above problem is
A staircase construction split unit that constructs stairs by installing a plurality of units along the slope of the stairs,
This problem can also be solved by providing a split unit for staircase construction, characterized in that the treads and risers for a plurality of steps and the left and right side panels are integrated together.
This split unit for staircase construction can be suitably used as the "split unit" in the construction method described above.

As described above, the present invention makes it possible to provide a staircase construction method that can significantly reduce on-site work, such as by eliminating the need to adjust the dimensions of the treads, risers, and side panels on-site, and that can reduce the time and cost required to construct the stairs. It is also possible to provide a split unit for staircase construction that can be suitably used with this construction method.

FIG. 2 is a perspective view showing each split unit that constitutes the staircase. 2 is a perspective view showing a first split unit among the split units shown in FIG. 1 . FIG. 2 is a perspective view showing a second split unit among the split units shown in FIG. 1 . FIG. 2 is a perspective view showing a third split unit among the split units shown in FIG. 1 . FIG. FIG. 2 is a perspective view showing the rails fixed to the left and right wall surfaces. FIG. 11 is a perspective view showing how the first split unit is placed on the left and right rails. FIG. 4 is a perspective view showing a state after the first split unit has been placed on the left and right rails. FIG. 11 is a perspective view showing how the second split unit is placed on the left and right rails. FIG. 11 is a perspective view showing a state after the second split unit has been placed on the left and right rails. FIG. 11 is a perspective view showing how the third split unit is placed on the left and right rails. FIG. 11 is a perspective view showing a state after the third split unit has been placed on the left and right rails. FIG. 11 is a side view showing how the third split unit is placed on the rail. FIG. 11 is a side view showing the state after the third split unit has been placed on the rail. FIG. 13 is a perspective view showing how baseboards and the like are attached. This is a perspective view showing the stairs after construction. This is a side view showing the stairs after construction. FIG. 13 is a perspective view showing a modified example of the split unit.

1. Overview of the staircase construction method of the present invention A preferred embodiment of the staircase construction method of the present invention will be described in more detail with reference to the drawings. The configuration described below is merely an example, and the technical scope of the construction method of the present invention is not limited to the configuration described below. The construction method of the present invention can be modified as appropriate within the scope of the invention.

Figure 1 is a perspective view showing each of the split units 10 that make up the staircase 1. For ease of illustration, in Figure 1, of the pair of left and right walls 2, 3, the wall 3 that is closest to the page (the right wall 3) is shown with a dashed line. The wall 3 is also shown with a dashed line in Figures 5 to 11, 14, and 15 shown below.

As shown in Figure 1, the construction method of the present invention involves constructing a staircase 1 between left and right wall surfaces 2 and 3. The staircase 1 is made up of a number of split units 10 divided into upper and lower parts, and is constructed by placing these split units 10 on a pair of left and right rails 20 fixed to the wall surfaces 2 and 3. Since each split unit 10 is constructed between a pair of left and right walls 2 and 3, the left and right width of each split unit 10 (the distance between the outer surfaces of a pair of side panels 10c) is set slightly smaller (usually around 10 mm smaller) than the inner width of the wall surfaces 2 and 3.

Figures 2, 3, and 4 are perspective views showing the first split unit 11, the second split unit 12, and the third split unit 13, respectively, of the split units 10 shown in Figure 1. As shown in Figures 2 to 4, each split unit 10 is composed of multiple steps of footboards 10a and risers 10b, and a pair of left and right side panels 10c. These split units 10 are assembled in a factory, and transported in that assembled state to the construction site for installation.

In this way, multiple steps of treads 10a and risers 10b and a pair of left and right side panels 10c are preassembled at the factory, and then transported and installed as separate units 10, reducing on-site work. For example, there is no need to adjust the dimensions of the treads 10a and risers 10b on-site. In addition, by using the rails 20, there is no need to mark out each tread 10a, and it is sufficient to mark out only the points necessary to determine the inclination angle and position of the rails 20.

As a result, the construction method of the present invention can significantly reduce on-site work. Specifically, the construction of staircase 1, which previously took a full day to a day and a half, can be completed in about 2 to 3 hours with the construction method of the present invention. This makes it possible to reduce the time and cost required to construct staircase 1.

The step board 10a, riser board 10b, and side board 10c that make up each split unit 10 are usually made of wood (wooden board material). In the construction method of this embodiment, the step board 10a, riser board 10b, and side board 10c are made of laminated wood. The rail 20 is also made of wood (wooden longitudinal material). This makes it possible to fix the rail 20 to the wall surfaces 2, 3, fix the split unit 10 to the rail 20, and fix the split units 10 to each other by driving screws or nails.

The step height of each step of the staircase 1 (the height from one tread 10a to the next tread 10a) is determined appropriately depending on the construction location and type of the staircase 1. However, the staircase 1 of a typical house often has 10 to 20 steps with a step height of about 15 to 25 cm, and usually has 12 to 16 steps with a step height of about 18 to 22 cm. The staircase 1 constructed using the construction method of this embodiment has a total of 14 steps, including the top step formed by the upper step frame 50, and the step height of all steps is standardized (divided evenly) at about 20.8 cm.

The number of steps (number of treads 10a) of each split unit 10 is two or more. The specific number of steps varies depending on the step height of each step, and is not particularly limited. However, if the number of steps of each split unit 10 is too small, the number of split units 10 required to construct one staircase 1 (one floor's worth of staircase 1) increases, and the installation of the split units 10 becomes more time-consuming. For this reason, the number of steps of each split unit 10 is preferably three or more, and more preferably four or more.

However, if the number of steps (the number of treads 10a) of each split unit 10 is too large, each split unit 10 may become too large, which may make it difficult to transport the split unit 10 to the site or to install the split unit 10. For this reason, if the step height of each step is as described above, the number of steps of each split unit 10 is usually set to 10 steps or less. The number of steps of each split unit 10 is preferably set to 7 steps or less, and more preferably set to 6 steps or less.

In the construction method of this embodiment, as shown in FIG. 1, the staircase 1 is constructed using a first split unit 11 constituting the lower part of the staircase 1, a second split unit 12 constituting the middle part of the staircase 1, and a third split unit 13 constituting the upper part of the staircase 1. The number of steps of the first split unit 11 (FIG. 2) is five, and the number of steps of the second split unit 12 (FIG. 3) and the third split unit 13 (FIG. 4) are each four. When constructing the staircase 1 of a general house, it is preferable to set the number of steps of each split unit 10 to about four to five steps. Split units 10 with this number of steps can be constructed by two people. However, depending on the site, there may be cases where one carpenter must work. In such a case, it is preferable to further divide each split unit 10 into two or three units, and limit the number of steps of the split units 10 to about two steps, as shown in FIG. 17. FIG. 17 is a perspective view showing a modified example of the split unit 10. This makes it possible for one person to easily construct the split units 10.

The number of split units 10 constituting one staircase 1 is two or more. The specific number varies depending on the construction location and type of staircase 1, and is not particularly limited. However, if the number of split units 10 constituting the staircase 1 is too small, each split unit 10 may become too large, which may make it difficult to transport the split units 10 to the site or to construct the split units 10. For this reason, the number of split units 10 constituting one staircase 1 is usually three or more.

However, if the number of split units 10 constituting one staircase 1 is too large, it will be time-consuming to install the split units 10. For this reason, it is preferable that the number of split units 10 constituting one staircase 1 is 10 or less. It is more preferable that the number of split units 10 constituting one staircase 1 is 7 or less, and even more preferable that the number is 5 or less. As already mentioned, in the staircase construction method of the present invention, one staircase 1 is composed of three split units 10 (first split unit 11, second split unit 12, and third split unit 13).

2. Specific Construction Procedure of the Staircase Construction Method of the Present Invention The steps for constructing the staircase 1 using the construction method of the present invention will be described in order.

2.1 Fixing the rails Fig. 5 is a perspective view showing the state in which the rails 20 are fixed to the left and right wall surfaces 2, 3. First, as shown in Fig. 5, the rails 20 are fixed to the left and right wall surfaces 2, 3 at an angle that follows the inclination of the staircase 1 (Fig. 1). The rails 20 can be fixed to the walls 2, 3 by screwing or nailing. Each of the rails 20 fixed to the walls 2, 3 may have a structure in which they are divided in the longitudinal direction, but in the construction method of this embodiment, each of the rails 20 is made of a single continuous piece of square timber.

The length L ₁ of each rail 20 (see FIG. 16 below) varies depending on the overall length L ₀ of the staircase 1 (see FIG. 16 below), and is not particularly limited. However, if the rail 20 is made too short with respect to the overall length L ₀ of the staircase 1, the rail 20 will not be able to support all of the split units 10. For this reason, it is preferable to set the length L ₁ of each rail 20 in a range such that the ratio L ₁ /L ₀ to the overall length L ₀ of the staircase 1 is 0.5 or more. It is more preferable that the ratio L ₁ /L ₀ is 0.6 or more, and even more preferable that it is 0.7 or more. The ratio L ₁ /L ₀ has no upper limit as long as it is 1 or less, but is usually set to 0.95 or less.

The width (left-right width) of each rail 20 is not particularly limited. However, if the width of the rail 20 is too narrow, it becomes difficult to place the split unit 10 on the upper side of the rail 20. For this reason, the width of the rail 20 is usually set to 10 mm or more. The width of the rail 20 is preferably 20 mm or more, and more preferably 30 mm or more. However, if the width of the rail 20 is made too wide, the rail 20 will simply become heavier and there will be no effect on the ease of placing the split unit 10. For this reason, the width of the rail 20 is usually set to 50 mm or less. In the construction method of this embodiment, the width of the rail 20 is set to 36 mm.

The vertical width (top-bottom width) of each rail 20 is not particularly limited. However, if the vertical width of the rail 20 is made too narrow, the strength of the rail 20 decreases, and there is a risk that the rail 20 may break when the split unit 10 is placed on the rail 20. For this reason, the vertical width of the rail 20 is usually set to 10 mm or more. The vertical width of the rail 20 is preferably 30 mm or more, and more preferably 50 mm or more. However, if the vertical width of the rail 20 is made too wide, the rail 20 becomes heavy and difficult to handle. For this reason, the vertical width of the rail 20 is usually set to 100 mm or less. In the construction method of this embodiment, the vertical width of the rail 20 is set to 60 mm.

Furthermore, the inclination angle θ of the rail 20 (see FIG. 16 below) is set to the same as the inclination angle of the staircase 1. When constructing the staircase 1 of a typical house, the inclination angle θ of the rail 20 is usually set to 30° or more. The inclination angle θ of the rail 20 is often set to 35° or more, and often set to 40° or more. On the other hand, if the inclination angle θ of the rail 20 becomes too large (too close to 90°), the staircase 1 becomes too steep. For this reason, the inclination angle θ of the rail 20 is usually set to 60° or less. The inclination angle θ of the rail 20 is often set to 55° or less, and often set to 50° or less. In the construction method of this embodiment, the inclination angle θ of the rail 20 is set to about 45°.

Incidentally, when fixing the rail 20 to the wall surfaces 2 and 3, the wall surfaces 2 and 3 are usually marked in advance. This marking is performed at the points required to specify the position and inclination angle of the rail 20. The position and inclination angle of the rail 20 relative to each of the wall surfaces 2 and 3 can be determined by marking two points on each of the wall surfaces 2 and 3. However, the rail 20 is long, and even if the marks are made at the points at both ends, the center part may bend downward. For this reason, in the construction method of this embodiment, each rail 20 is marked at three points (a point near the lower end of the rail 20, a point near the center of the rail 20, and a point near the upper end of the rail 20). When marking, it is recommended to temporarily fix the upper frame 50 (see FIG. 16 below) to the beam 60.

2.2 Placing the split units Once the rails 20 have been fixed to the wall surfaces 2 and 3 as shown in Fig. 5, the split units 10 are then placed from below on the rails 20 as shown in Figs. 6 to 11. Figs. 6 to 11 are perspective views showing how the split units 10 are placed on the left and right rails 20, with Fig. 6 showing how the first split unit 11 is placed, Fig. 7 showing the state after the first split unit 11 has been placed, Fig. 8 showing how the second split unit 12 is placed, Fig. 9 showing the state after the second split unit 12 has been placed, Fig. 10 showing how the third split unit 13 is placed, and Fig. 11 showing the state after the third split unit 13 has been placed.

First, as shown in Figures 6 and 7, the first split unit 11 is placed near the lower end of a pair of left and right rails 20. The first split unit 11 can be easily transported by one person holding the lower front part with both hands and the other person holding the upper part at the back with both hands. When placing the first split unit 11 on the rails 20, the first split unit 11 is placed with the inclined end surface α of its side panel 10c aligned with the inclined end surface β of the rail 20. The bottom part of the first split unit 11 is in contact with the floor surface. This allows the first split unit 11 to be positioned in the front-to-rear direction, and the inclination angle of the first split unit 11 to match the inclination angle of the rail 20.

However, there may be cases where the step 10a of the first split unit 11 is not level. For this reason, when installing the first split unit 11, the step 10a is leveled using a level or the like. If the step 10a is not level, adjust it so that it is level by inserting a wedge (spacer) between the first split unit 11 and the rail 20. The wedge (spacer) can also be inserted in the gap between the first split unit 11 and the wall surfaces 2, 3. This makes it possible to prevent the first split unit 11 from wobbling in the left-right direction. Sound insulation material or sound absorption material can also be inserted in the gap between the first split unit 11 and the wall surfaces 2, 3. These procedures can also be adopted when installing other split units 10 (second split unit 12 and third split unit 13).

Once it has been confirmed that the footboard 10a is horizontal, the first split unit 11 is fixed to the rail 20. The first split unit 11 can be fixed to the rail 20 by driving screws or nails into the underside of the rail 20 (the side of the inclined end surface facing opposite to the inclined end surface β).

After the first split unit 11 is installed, the second split unit 12 is placed near the center of the pair of left and right rails 20, as shown in Figures 8 and 9. The transportation and installation methods for the second split unit 12 are the same as those for the first split unit 11, but the bottom of the second split unit 12 is placed against the top of the first split unit 11. In the construction method of this embodiment, the bottom of the second split unit 12 is fitted into the notch 10d provided at the top of the first split unit 11. This allows the second split unit 11 to be accurately positioned adjacent to the upper side of the first split unit 11. After being placed on the rail 20, the second split unit 11 is fixed to the rear end surface of the footboard 10a located at the top of the first split unit 11 by screwing or nailing from the back side of the riser 10b located at the bottom of the second split unit 11, and is fixed to the rail 20 by screwing or nailing from the underside of the rail 20.

After the installation of the second split unit 12 is completed, the third split unit 13 is placed near the upper ends of the pair of left and right rails 20, as shown in Figures 10 and 11. The method of transporting and installing the third split unit 13 is almost the same as that of the second split unit 11. The bottom part of the third split unit 13 is also fitted into the notch 10d provided at the top part of the second split unit 12. However, a person lifting the upper part at the back of the third split unit 13 will be unable to reach it from a lower floor, and will have to bend down from a higher floor. For this reason, the task of placing the third split unit 13 on the rails 20 is more difficult than in the case of the first split unit 11 or the second split unit 12.

Therefore, in the construction method of this embodiment, as shown in FIG. 12, first, the corner 10e on the rear side (the right side as you face the paper in the figure) of the third split unit 13 is placed on the inclined end surface β of the rail 20, and then the third split unit 13 is pushed up from the front side (the left side as you face the paper in the figure) to slide the rear corner 10e of the third split unit 13 against the rail 20 and move it to the position shown in FIG. 13. FIG. 12 is a side view showing the state in which the third split unit 13 is placed on the rail 20. FIG. 13 is a side view showing the state after the third split unit 13 has been placed on the rail 20. In FIGS. 12 and 13, the wall surfaces 2 and 3 are omitted from illustration.

By constructing the third split unit 13 in this manner, once it has reached the state shown in FIG. 12, the third split unit 13 can be constructed without having to hold the upper part of the rear side with one's hand. In this regard, in the construction method of this embodiment, the rear corner 10e of the third split unit 13 is formed in a rounded shape, making it easier for the third split unit 13 to slide against the inclined end surface β of the rail 20. A low-friction sheet or the like can be attached to the inclined end surface β of the rail 20 and the rear corner 10e of the third split unit 13. These configurations can be used not only for the third split unit 13, but also for the other split units 10 (the first split unit 11 and the second split unit 12).

After being placed on the rail 20, the third split unit 13 is fixed to the rear end face of the footboard 10a located at the topmost part of the second split unit 12 by driving screws or nails into the back side of the riser plate 10b located at the bottommost part of the third split unit 13, and is also fixed to the rail 20 by driving screws or nails into the underside of the rail 20.

2.3 Installation of Baseboards, etc. After all the split units 10 have been placed on the rails 20, the baseboard 30, the top riser 40, and the upper step frame 50 are then attached to the stairs 1, as shown in Fig. 14. Fig. 14 is a perspective view showing how the baseboard 30, etc. is attached to the stairs 1. In Fig. 14, the baseboard 30 is illustrated as being attached only to some of the steps that make up the stairs 1, but in reality, the baseboard 30 is attached to all of the steps. Also, in Fig. 14, the baseboard 30 is illustrated as being attached only to the wall 2 side (left side) of the stairs 1, but in reality, the baseboard 30 is also attached to the wall 3 side (right side) of the stairs 1.

In the construction method of this embodiment, the baseboard 30 is a plate material that is L-shaped in side view, and is attached by fitting horizontally from the front side to the nosing of the tread 10a of each step. As already mentioned, there are gaps between each split unit 10 and the wall surface 2, and between each split unit 10 and the wall surface 3, but by attaching the baseboard 30 along the left and right edges of the staircase 1, these gaps can be hidden. There are no particular limitations on the means for fixing the baseboard 30, but in the construction method of this embodiment, the baseboard 30 is fixed to the walls 2 and 3 using an adhesive.

Figure 15 is a perspective view of the staircase 1 after construction, and Figure 16 is a side view of the staircase 1 after construction. As shown in Figures 15 and 16, the top step riser 40 is inserted into the gap between the third split unit 13 and the beam 60. The riser 40 is fixed to the rear end surface of the tread 10a of the third split unit 13 by screwing or nailing from the back side. A gap of about 10 mm is formed between the riser 40 and the beam 60. Without this gap, the third split unit 13 would need to be positioned as close as possible to the beam 60, and as shown in Figure 10, when installing the third split unit 13 above the second split unit 12, the third split unit 13 may interfere with the beam 0, making it difficult to install.

Once the top riser 40 is fixed, the upper frame 50 is placed over it and fixed to the beams 60 etc. A recess is formed on the underside of the upper frame 50, into which the upper end of the riser 40 can be fitted. The upper frame 50 is fixed to the beams 60 etc. by driving in screws or nails. Once the upper frame 50 has been fixed, the construction of the staircase 1 is complete. If it is necessary to apply an anti-slip coating or finish to the riser 40 etc., this is done separately.

2.4 Summary As described above, the construction method of this embodiment allows the staircase 1 to be constructed with a very small number of steps, and the time and cost required for constructing the staircase 1 can be significantly reduced. All of the procedures described above can be completed in about 2 to 3 hours. In addition, each split unit 10 is assembled in a factory, and has high dimensional accuracy. Therefore, it is possible to construct a high-quality staircase 1 that is not dependent on the skill of the craftsman. The construction method of the present invention can be used when constructing a curved staircase, but is preferably used when constructing a straight staircase.

REFERENCE SIGNS LIST 1 staircase 2 left wall surface 3 right wall surface 10 split unit 10a tread 10b riser 10c side panel 10d notch 10e rear corner 11 first split unit 12 second split unit 13 third split unit 20 rail 30 baseboard 40 top riser 50 upper frame 60 beam

Claims (6)

A method for constructing stairs between left and right wall surfaces, comprising:
The staircase is made up of several separate units, divided into upper and lower sections.
Each split unit is assembled in a factory from multiple steps, step boards and risers made of wooden boards , and left and right side panels made of wooden boards .
After fixing the rails to the left and right walls at an angle that matches the slope of the stairs,
A plurality of split units are placed on the rail in order from the bottom ,
The split unit is fixed to the rail by driving screws or nails into the underside of the rail.
A method for constructing stairs characterized by the above.
A method for constructing stairs as described in claim 1, in which a riser plate located at the lowest stage of one split unit is fixed to the end face of a tread plate located at the highest stage of another split unit arranged immediately below the one split unit by driving screws or nails into the back side of the riser plate.
3. The method for constructing stairs according to claim 1 or 2 , further comprising the step of fixing baseboards to the left and right sides of the split unit after the split unit is placed on the rail.
The method for constructing stairs according to any one of claims 1 to 3 , wherein a corner portion on the inner side of the side panel of at least one of the split units is formed into a round shape.
A method for constructing stairs between left and right wall surfaces, comprising:
The staircase is made up of several separate units, divided into upper and lower sections.
Each split unit is assembled in a factory from multiple steps, risers, and left and right side panels.
A sound-proofing material is fixed to the outer surface of the side panel,
After fixing the rails to the left and right walls at an angle that matches the slope of the stairs,
A staircase construction method comprising the steps of: placing a plurality of split units on the rail in order from the bottom up.
A staircase construction split unit that constructs stairs by installing a plurality of units along the slope of the stairs,
The step boards and risers for multiple steps are made of wooden boards , and the left and right side panels are also made of wooden boards .
Sound-proofing material is fixed to the outer surface of the side panel.
A split unit for staircase construction.

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