JP7506595B2 - How to renovate a stairwell - Google Patents

Description

The present invention is a method for renovating a stairwell that has a stair section and a landing.

Conventionally, there is known a staircase that has a lower stair section that connects a lower floor (such as a lower floor) to a landing, and an upper stair section that connects an upper floor (such as an upper floor) to the landing, and that is arranged so that the lower stair section and the upper stair section extend in a manner that turns around at the landing (see, for example, Patent Document 1).

JP 2018-184704 A

In this type of stairwell, the lower and upper stairwell sections are arranged side by side along one of the four sides of the rectangular landing, and the remaining three sides are covered by walls or the like. For example, when renovating a stairwell to reinforce a building against earthquakes, it may be necessary to reinforce the wall at the back of the landing, opposite the front side where the lower and upper stairwell sections are arranged.

In order to reinforce the wall at the back of the landing, it is necessary to secure reinforcing space at the back end of the landing, for example, space to install reinforcement against the back wall. However, if reinforcing space is secured at the back end of the landing, the width of the landing in the depth direction will be reduced, and the minimum width required for a landing will not be secured. This may have made it impossible to carry out renovations such as reinforcing the wall at the back of the landing.

In light of this situation, the main objective of the present invention is to provide a method for renovating a stairwell that allows for renovations such as reinforcing the wall at the back of the landing.

A first characteristic configuration of the present invention is a method for renovating a staircase, which is provided with a lower staircase section connecting a lower floor side and a landing, and an upper staircase section connecting an upper floor side and the landing, and is arranged so that the lower staircase section and the upper staircase section extend in a state of turning back at the landing,
In the landing, the side where the lower staircase and the upper staircase are arranged is the front side, and the opposite side is the back side,
A reinforcement space securing process of removing a portion of the lower staircase portion and the upper staircase portion adjacent to the landing, expanding the landing to the removed portion, and securing a reinforcement space at the rear end of the landing;
The present invention provides a circular staircase construction process in which a staircase corresponding to the removed portions of the lower staircase and the upper staircase is provided on the landing, and the landing is provided as a circular staircase.

According to this configuration, by performing the reinforcing space securing process, the reinforcing space at the rear end of the landing can be utilized to reinforce the rear wall of the landing. Moreover, by removing a portion of the lower staircase and the upper staircase adjacent to the landing and expanding the landing to the removed portion, the width of the landing in the depth direction can be prevented from becoming narrower and the minimum width that should be secured as a landing can be secured. Furthermore, by performing the spiral staircase construction process, a staircase corresponding to the removed portion of the lower staircase and the upper staircase can be provided on the landing as a spiral staircase, so that the removed staircase can be secured as a spiral staircase. In this way, the reinforcing space at the rear end of the landing can be utilized to reinforce the rear wall of the landing, while the landing can be provided as a spiral staircase with the minimum width in the depth direction secured. Therefore, it is possible to suitably carry out renovations such as reinforcing the rear wall of the landing.

The second characteristic feature of the present invention is that a wall reinforcement process is carried out at the rear end of the landing, in which the reinforcement space is utilized to reinforce the existing wall by building additional reinforcement walls inside the existing wall.

According to this configuration, the existing wall can be reinforced by utilizing the reinforcement space at the rear end of the landing to install additional reinforcing wall sections inside the existing wall section, so that the existing wall section at the rear of the landing can be appropriately reinforced while still utilizing the existing wall section at the rear of the landing.

(A) is a plan view of the existing stairwell, and (B) is a plan view of the stairwell showing the process of securing reinforcement space. (A) is a plan view of a staircase showing a wall reinforcement process, and (B) is a plan view of a staircase showing a spiral staircase construction process. A perspective view of the staircase after renovation

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a staircase renovation method according to the present invention will be described with reference to the drawings.
As shown in Figure 1 (A), the existing staircase 1 has a lower staircase section 2 that connects the lower floor side, such as a lower floor, to a landing 4, and an upper staircase section 3 that connects the upper floor side, such as an upper floor, to the landing 4, and is arranged so that the lower staircase section 2 and the upper staircase section 3 extend in a manner that turns around at the landing 4.

The landing 4 is formed in a rectangular shape in a plan view, with the lower staircase section 2 and the upper staircase section 3 arranged adjacent to one of the four sides of the rectangular landing 4, and the remaining three sides being covered by walls 5 to 7. In the following description, the side of the landing 4 on which the lower staircase section 2 and the upper staircase section 3 are arranged will be referred to as the front side (the left side in Figures 1 and 2), and the opposite side will be referred to as the back side (the right side in Figures 1 and 2).

In the left-right direction when viewed from the depth direction of the landing 4 (the up-down direction in Figs. 2 and 3), the first side wall 5 on the side where the lower stair section 2 is arranged extends to cover one side of the side of the landing 4 and the side of the lower stair section 2 that extends continuously from that side. In the left-right direction when viewed from the depth direction of the landing 4 (the up-down direction in Figs. 1 and 2), the second side wall 6 on the side where the upper stair section 3 is arranged extends to cover one side of the side of the landing 4 and the side of the upper stair section 3 that extends continuously from that side. The rear wall 7 on the rear side of the landing 4 extends to cover one side of the rear of the landing 4.

In this embodiment, in order to reinforce the earthquake resistance of a building, the existing staircase 1 shown in Figure 1 (A) is renovated (see Figure 3) to reinforce the rear wall 7 at the rear of the landing 4. Incidentally, Figure 3 shows the state after renovation to reinforce the rear wall 7 at the rear of the landing 4. The method of renovating the staircase is to reinforce the rear wall 7 at the rear of the landing 4 by carrying out the steps of securing a reinforcing space (see Figure 1 (B)), reinforcing the wall (see Figure 2 (A)), and constructing the circular staircase (see Figure 2 (B)).

In the reinforcement space securing process, as shown in FIG. 1B, a part of the lower staircase section 2 and the upper staircase section 3 adjacent to the landing 4 is removed, and the landing 4 is expanded forward to the removed part, and a reinforcement space 8 is secured at the rear end of the landing 4. For example, in the removal of the staircase section, only the top step adjacent to the landing 4 in the lower staircase section 2 (the step indicated by 2a in FIG. 1A) is removed, and only the bottom step adjacent to the landing 4 in the upper staircase section 3 (the step indicated by 3a in FIG. 1A) is removed. In addition, one step of the wall between the lower staircase section 2 and the upper staircase section 3 is also removed. By removing the staircase section in this way, the range in which the landing 4 is expanded forward can be set to the range from the top step to the second step on the lower staircase section 2 side, and the range from the bottom step to the second step on the upper staircase section 3 side. This allows the front end of the landing 4 to be expanded forward by one stair step (width B shown in Figs. 1(A) and (B)), and a reinforcing space 8 for one stair step can be secured at the rear end of the landing 4 (the space from the rear wall 7 to the dotted line in Fig. 1(B)). Therefore, regarding the width of the landing 4 in the depth direction, the width A2 of the landing 4 in the depth direction excluding the reinforcing space 8 in Fig. 1(B) can be prevented from becoming smaller than the width A1 of the landing 4 in the depth direction in the existing staircase 1 shown in Fig. 1(A), and the minimum width that should be secured for the landing 4 can be secured.

In the wall reinforcement process, as shown in FIG. 2(A), the reinforcement space 8 is utilized to reinforce the existing rear wall 7 at the rear end of the landing 4 by building additional reinforcement wall 10 on the inside of the existing rear wall 7 to reinforce the existing rear wall 7. In this way, the reinforcement wall 10 is built on the inside of the rear wall 7, so that the reinforcement wall 10 is provided in a state where it overhangs the front reinforcement space 8, and the rear wall 7 can be suitably reinforced.

In the circular staircase construction process, as shown in FIG. 2(B), staircases corresponding to the removed areas of the lower staircase 2 and the upper staircase 3 are provided on the landing 4, and the landing 4 is provided as a circular staircase 9. In the reinforcing space securing process, one step is removed from each of the lower staircase 2 and the upper staircase 3, so in the circular staircase construction process, a total of three staircases are provided on the landing 4: one step 9a on the lower staircase 2 side, one step 9b on the upper staircase 3 side, and one step 9c at the original height of the landing 4, and the landing 4 is provided as a circular staircase 9.

In this staircase renovation method, as described above, the reinforcement space securing process, wall reinforcement process, and circular staircase construction process are performed, but the construction order can be, for example, as shown in Figures 1(B), 2(A), and 2(B) in the order of reinforcement space securing process, wall reinforcement process, and circular staircase construction process. In this way, the reinforcement space securing process and circular staircase construction process are performed in the order of the reinforcement space securing process, followed by the circular staircase construction process. The construction order of the wall reinforcement process can be changed as appropriate, and is not limited to being performed between the reinforcement space securing process and the circular staircase construction process as described above, but can also be performed last after the reinforcement space securing process and the circular staircase construction process, or can be performed in parallel with the reinforcement space securing process and the circular staircase construction process.

[Another embodiment]
Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the wall reinforcement process is performed to reinforce the existing rear wall 7 at the rear end of the landing 4 by adding reinforcement wall 10 inside the existing rear wall 7 using the reinforcement space 8, but the way in which the rear wall 7 is reinforced can be changed as appropriate.

(2) In the above embodiment, in the reinforcement space securing process, only the top step adjacent to the landing 4 in the lower staircase section 2 is removed, and only the bottom step adjacent to the landing 4 in the upper staircase section 3 is removed. However, the number of steps removed in the lower staircase section 2 and the upper staircase section 3 can be changed as appropriate depending on, for example, how much space is to be secured as the reinforcement space 8.

2 Lower staircase 3 Upper staircase 4 Landing 8 Reinforcement space 9 Circumferential staircase 10 Reinforcement wall

Claims (2)

A method for renovating a staircase, which is provided with a lower staircase section connecting a lower floor side and a landing, and an upper staircase section connecting an upper floor side and the landing, and is arranged so that the lower staircase section and the upper staircase section extend in a turning back state at the landing,
In the landing, the side where the lower staircase and the upper staircase are arranged is the front side, and the opposite side is the back side,
A reinforcement space securing process of removing a portion of the lower staircase portion and the upper staircase portion adjacent to the landing, expanding the landing to the removed portion, and securing a reinforcement space at the rear end of the landing;
A method for renovating a staircase, comprising a process of constructing a circular staircase by providing the landing with staircase sections corresponding to the removed portions of the lower staircase section and the upper staircase section, and providing the landing as a circular staircase section. The method for renovating a stairwell as described in claim 1, in which a wall reinforcement process is carried out at the rear end of the landing, utilizing the reinforcement space to reinforce the existing wall by building additional reinforcement walls inside the existing wall.

Images