Bent stairs

Abstract

We provide a L-shaped staircase with excellent ease of installation. [Solution] The L-shaped staircase according to the present invention is a L-shaped staircase 1 comprising a lower staircase 2, an upper staircase 3, and a landing 4 provided between the lower staircase 2 and the upper staircase 3, wherein the landing 4 comprises a frame 5 and a plate portion 6 provided on the frame 5, and the frame 5 is characterized in that it is formed by connecting a lower staircase stringer extension portion 20A, which is an extension of the stringers 20, 20 of the lower staircase, and an upper staircase stringer extension portion 30A, which is an extension of the stringers 30, 30 of the upper staircase.

Description

Technical Field

[0001] The present invention relates to a quarter-turn staircase, and more particularly to a frame structure for a landing of a quarter-turn staircase.

Background Art

[0002] A quarter-turn staircase including a lower flight, an upper flight, and a landing provided between the lower flight and the upper flight is known (see Patent Document 1). A landing is an intermediate portion of a staircase provided for purposes such as changing the direction of the staircase, allowing a short rest, and reducing the risk of falling. A quarter-turn staircase is a staircase configured such that the extending direction of the lower flight and the extending direction of the upper flight change direction by 90° at the landing. In the quarter-turn staircase disclosed in Patent Document 1, the detailed structure of the landing is not disclosed. Note that, as a structure of a landing for a half-turn staircase, for example, a structure including a frame and a plate portion provided on the frame is known (see Patent Document 2). The frame of the landing for a half-turn staircase disclosed in Patent Document 2 is constituted by a rectangular frame body formed by erection of four joists between a pair of front and rear joist receiving members to integrate them by joining; the lower surface of a rectangular plate portion (flat plate) is placed on this rectangular frame body and the plate portion is fixed to the frame body, thereby forming the landing. A conventional quarter-turn staircase is configured, for example, by connecting the frame body constituting the landing frame disclosed in the above-mentioned Patent Document 2 or the like to the stringer of the lower flight and the stringer of the upper flight.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the conventional L-shaped staircase described above, the landing frame, the stringer of the lower staircase, and the stringer of the upper staircase are constructed separately. The stringer of the upper staircase is connected to the landing frame, and the landing frame is connected to the stringer of the lower staircase. This configuration makes construction complicated and presents challenges in terms of ease of construction.

[0005] To solve the above problems, this invention provides a L-shaped staircase with excellent constructability. [Means for solving the problem]

[0006] The L-shaped staircase according to the present invention is a L-shaped staircase comprising a lower staircase, an upper staircase, and a landing provided between the lower staircase and the upper staircase, wherein the landing comprises a frame and a plate provided on the frame, and the frame is characterized in that it is constructed by connecting a lower staircase stringer extension, which is an extension of the stringer of the lower staircase, and an upper staircase stringer extension, which is an extension of the stringer of the upper staircase. Furthermore, the extended end of the lower staircase stringer is fixed to the building wall via a mounting part. Furthermore, the framework is characterized by being fixed to the building's floor via support columns. Furthermore, the lower staircase stringer extension is composed of a pair of left and right first plate-like members having plate surfaces formed integrally with the lower staircase stringer and extending vertically and horizontally, with mutually parallel upper and lower edges extending horizontally, and the upper staircase stringer extension is composed of a pair of left and right second plate-like members having plate surfaces formed integrally with the upper staircase stringer and extending vertically and horizontally, with mutually parallel upper and lower edges extending horizontally, the first plate-like member has an upper opening slit extending downward from the upper edge of the first plate-like member, and the second plate-like member has a lower opening slit extending upward from the lower edge of the second plate-like member, and the frame is composed of the upper opening slit of the first plate-like member and the second The invention is characterized by comprising: a frame in which the first plate-shaped member and the second plate-shaped member are combined so that the plate surface of the first plate-shaped member and the plate surface of the second plate-shaped member are perpendicular to each other, by fitting the lower opening slit of the plate-shaped member with the lower opening slit of the first plate-shaped member, inserting the plate portion located below the upper opening slit of the first plate-shaped member into the lower opening slit of the second plate-shaped member, and inserting the plate portion located above the lower opening slit of the second plate-shaped member into the upper opening slit of the first plate-shaped member, thereby forming a frame in which the plate surface of the first plate-shaped member and the plate surface of the second plate-shaped member are perpendicular to each other; and joining means for joining the first plate-shaped member and the second plate-shaped member at the intersection of the first plate-shaped member and the second plate-shaped member in the frame so that the upper edge of the first plate-shaped member and the upper edge of the second plate-shaped member in the frame are located on the same horizontal plane. In the L-shaped staircase according to the present invention, the frame is constructed by connecting an extended lower staircase stringer section, which is an extension of the lower staircase stringer, with an extended upper staircase stringer section, which is an extension of the upper staircase stringer, thus providing a L-shaped staircase with excellent constructability. [Brief explanation of the drawing]

[0007] [Figure 1] A perspective view showing a L-shaped staircase according to the present invention (Embodiment 1). [Figure 2] A perspective view showing the framework of the landing (Embodiment 1). [Figure 3] An exploded perspective view showing the framework of the landing (Embodiment 1). [Figure 4]A diagram showing the construction method of the frame (Embodiment 1). [Figure 5] A perspective view showing the framework of the landing (Embodiment 2). [Figure 6] A perspective view showing the framework of a two-tiered landing (Embodiment 3). [Figure 7] A perspective view showing the framework of a landing with a three-tiered structure (Embodiment 4). [Modes for carrying out the invention]

[0008] Embodiment 1 As shown in Figure 1, the L-shaped staircase 1 according to Embodiment 1 is configured to include a lower staircase 2, an upper staircase 3, and a landing 4 provided between the lower staircase 2 and the upper staircase 3. The L-shaped staircase 1 according to Embodiment 1 is constructed of, for example, metal, wood, or a combination of metal and wood. The lower staircase 2 is constructed with a pair of left and right stringers 20, 20, multiple treads 21, 21... and a handrail 22, and the upper staircase 3 is similarly constructed with a pair of left and right stringers 30, 30, multiple treads 31, 31... and a handrail 32. The landing 4 is composed of a frame 5 and a plate 6 provided on top of the frame 5. The plate portion 6 is a component that makes up the floor plate (tread) of the landing 4, and is made up of a plate-like member such as a flat plate.

[0009] The stringer 20 of the lower staircase 2 has, for example, a plate surface 20a that extends diagonally upward from below and extends vertically and horizontally, and the upper edge 20b and lower edge 20c are made of plate-like members such as flat plates formed on multiple step edges of the staircase. Similarly, the stringer 30 of the upper staircase 3 has, for example, a plate surface 30a that extends diagonally upward from below and extends vertically and horizontally, and its upper edge 30b and lower edge 30c are made of plate-like members such as flat plates formed on multiple step edges of the staircase.

[0010] As shown in Figures 2 and 3, the frame 5 is formed by connecting a lower stair stringer extension 20A formed by extending stringers 20, 20 of a lower stair 2 and an upper stair stringer extension 30A formed by extending stringers 30, 30 of an upper stair 3.

[0011] The lower stair stringer extension 20A comprises: a left first plate-like member 20E provided to extend from the upper end side of the left stringer 20 of the lower stair 2, a left mounting portion 20H provided at the extended end (tip end) of the left first plate-like member 20E for mounting to a wall (wall skeleton) W, a right first plate-like member 20E provided to extend from the upper end side of the right stringer 20 of the lower stair 2, and a right mounting portion 20H provided at the extended end (tip end) of the right first plate-like member 20E for mounting to the wall (wall skeleton) W. The left first plate-like member 20E is formed to extend integrally with the left stringer 20 of the lower stair 2, has a plate surface 20x extending in the horizontal direction and the vertical direction, and is a plate-like member in which an upper edge 20y and a lower edge 20z parallel to each other extend in the horizontal direction. For example, the left first plate-like member 20E and the left stringer 20 are formed of a single flat plate. Similarly, the right first plate-like member 20E is formed to extend integrally with the right stringer 20 of the lower stair 2, has a plate surface 20x extending in the horizontal direction and the vertical direction, and is a plate-like member in which an upper edge 20y and a lower edge 20z parallel to each other extend in the horizontal direction. For example, the right first plate-like member 20E and the right stringer 20 are formed of a single flat plate. The mounting portion 20H is formed of a plate-like member such as a flat plate having a flat surface in contact with the surface of the wall W. The mounting portion 20H is joined to the extended end of the first plate-like member 20E by welding or the like, or is formed integrally with the first plate-like member 20E, or is formed by bending the extended end side of the first plate-like member 20E.

[0012] Further, the upper stair stringer extension 30A includes a left second plate-shaped member 30E provided to extend from the lower end side of the left stringer 30 of the upper stair 3, and a right second plate-shaped member 30E provided to extend from the lower end side of the right stringer 30 of the upper stair 3. The left second plate-shaped member 30E is formed to extend integrally with the left stringer 30 of the upper stair 3, has a plate surface 30x extending in the horizontal direction and the vertical direction, and is a plate-shaped member in which an upper edge 30y and a lower edge 30z parallel to each other extend in the horizontal direction. For example, the left second plate-shaped member 30E and the left stringer 30 are configured as a single flat plate. Similarly, the right second plate-shaped member 30E is formed to extend integrally with the right stringer 30 of the upper stair 3, has a plate surface 30x extending in the horizontal direction and the vertical direction, and is a plate-shaped member in which an upper edge 30y and a lower edge 30z parallel to each other extend in the horizontal direction. For example, the right second plate-shaped member 30E and the right stringer 30 are configured as a single flat plate.

[0013] As shown in FIG. 3, the first plate-shaped member 20E is formed with an upper opening slit 25 extending downward from the upper edge 20y of the first plate-shaped member 20E to a position about 1 / 2 of the height dimension of the plate-shaped member 20E. Two upper opening slits 25 are respectively formed in each of the left and right first plate-shaped members 20E, 20E. That is, the upper opening slits 25 are formed at predetermined positions spaced apart from each other in the front and rear in the extension direction of the first plate-shaped member 20E. The slit width of the upper opening slit 25 is formed to have a width dimension corresponding to the plate thickness of the second plate-shaped member 30E so that the second plate-shaped member 30E can be fitted therein. The second plate-shaped member 30E is formed with a lower opening slit 35 extending upward from the lower edge 30z of the second plate-shaped member 30E to a position about 1 / 2 of the height dimension of the plate-shaped member 30E. Two lower opening slits 35 are respectively formed in each of the left and right second plate-shaped members 30E, 30E. That is, the lower opening slits 35 are formed at predetermined positions spaced apart from each other in the front and rear in the extension direction of the second plate-shaped member 30E. The width of the lower opening slit 35 is formed to a width dimension corresponding to the thickness of the first plate-like member 20E, so that the first plate-like member 20E can be fitted into it. Furthermore, if the height dimension of the first plate-shaped member 20E and the height dimension of the second plate-shaped member 30E are different, the height dimensions of the upper opening slit 25 and the lower opening slit 35 are set so that when the lower stair stringer extension 20A and the upper stair stringer extension 30A are combined, the height position of the upper edge of the first plate-shaped member 20E and the height position of the upper edge of the second plate-shaped member 30E are aligned. In other words, the sum of the height dimensions of the lower opening slit 35 and the upper opening slit 25 should be equal to the height dimension of the second plate-like member 30E. For example, if the height of the lower opening slit 35 is half the height of the second plate-like member 30E, then the height of the upper opening slit 25 will be half the height of the second plate-like member 30E, regardless of the height of the first plate-like member 20E. Also, if the height of the lower opening slit 35 is one-third the height of the second plate-like member 30E, then the height of the upper opening slit 25 will be two-thirds the height of the second plate-like member 30E, regardless of the height of the first plate-like member 20E. Furthermore, if the height of the lower opening slit 35 is two-thirds the height of the second plate-like member 30E, then the height of the upper opening slit 25 will be one-third the height of the second plate-like member 30E, regardless of the height of the first plate-like member 20E.

[0014] The frame 5 consists of a frame 50 formed in a grid shape by combining the lower stair stringer extension 20A and the upper stair stringer extension 30A, and a joining means 7 that joins the first plate-shaped member 20E and the second plate-shaped member 30E at the intersection of the first plate-shaped member 20E and the second plate-shaped member 30E that constitute the frame 50.

[0015] The frame 50 is constructed by fitting the upper opening slits 25 of the left and right first plate-like members 20E, 20E together with the lower opening slits 35 of the second plate-like members 30E, 30E, inserting the plate portion located below the upper opening slit 25 of the first plate-like member 20E into the lower opening slit 35 of the second plate-like member 30E, and inserting the plate portion located above the lower opening slit 35 of the second plate-like member 30E into the upper opening slit 25 of the first plate-like member 20E, so that the plate surfaces 20x of the first plate-like members 20E, 20E and the plate surfaces 30x of the second plate-like members 30E, 30E are perpendicular to each other, and the first plate-like members 20E, 20E and the second plate-like members 30E, 30E are assembled in a grid-like manner. Specifically, the lower opening slits 35, 35 formed in the left second plate-shaped member 30E are fitted together with the upper opening slits 25, 25 formed on the left and right first plate-shaped members 20E on the side closer to the wall W, and the lower opening slits 35, 35 formed in the right second plate-shaped member 30E are fitted together with the upper opening slits 25, 25 formed on the left and right first plate-shaped members 20E on the side further from the wall W, thereby forming a grid-like frame 50.

[0016] As shown in Figures 2 and 3, the joining means 7 is configured to include, for example, a joining plate 7P and fixing means for fixing the joining plate 7P to the plate surface 20x of a first plate-shaped member 20E and the plate surface 30x of a second plate-shaped member 30E, which are adjacent to each other orthogonally. The fastening means consists, for example, a bolt 70 and a nut 71. The joining plate 7P is a joining plate fixed to the plate surface 20x of the first plate-like member 20E and the plate surface 30x of the second plate-like member 30E at the intersection of the first plate-like member 20E and the second plate-like member 30E in the lattice-shaped frame 50, such that the upper edge 20y of the first plate-like member 20E and the upper edge 30y of the second plate-like member 30E are aligned and positioned on the same horizontal plane. The joining plate is, for example, formed in an L-shape in cross-section. For example, as shown in Figure 2, connecting plates 7P are placed at each inner corner of the frame 50 (the four inner corners of the square frame of the grid that constitutes the frame 50), and these connecting plates 7P are fixed with bolts 70 and nuts 71. As a result, each inner corner, which is the intersection of the frame 50, is joined by connecting means 7, 7..., and the frame 5 is constructed. Alternatively, connecting plates 7P may be placed at each outer corner of the frame 50 to form the frame structure 5.

[0017] Next, an example of a construction method for the framework 5 of the landing 4 of the L-shaped staircase 1 according to Embodiment 1 will be described. The frame construction method comprises a lower member installation step and an upper member installation step.

[0018] First, in the lower member installation step, a pair of left and right lower members 23L and 23R are installed, which are integrally formed with the first plate-shaped member 20E and upper end mounting member 20H that constitute the lower staircase stringer extension 20A, and the stringer 20 and lower end mounting member 20L of the lower staircase 2 (see Figure 3). Specifically, the lower end mounting member 20L, which is provided at the lower end of the left lower member 23L, is fixed to the floor (floor structure) F at the designed mounting position using screws 20N or the like, and the mounting portion 20H, which is provided at the upper end of the left lower member 23L, is fixed to the wall (wall structure) W at the designed mounting position using screws 20N or the like. Similarly, the lower end mounting member 20L provided at the lower end of the right lower member 23R is fixed to the floor (floor structure) F at the designed mounting position with screws 20N or the like, and the mounting portion 20H provided at the upper end of the right lower member 23R is fixed to the wall (wall structure) W at the designed mounting position with screws 20N or the like.

[0019] Next, in the upper member installation step, a pair of left and right upper members 24L and 24R are installed, in which the second plate-shaped member 30E constituting the upper staircase stringer extension 30A and the stringer 30 of the upper staircase 3 are integrally formed. Specifically, as shown in Figure 2, the left second plate-shaped member 30E of the left upper member 24L is assembled to the left and right first plate-shaped members 20E, 20E that constitute the lower staircase stringer extension 20A. Then, the upper end of the left stringer 30 is fixed to the design mounting position on the upper floor, and the left second plate-shaped member 30E and the left and right first plate-shaped members 20E, 20E are joined using the joining means 7. Similarly, the right second plate-shaped member 30E of the right upper member 24R is assembled to the left and right first plate-shaped members 20E, 20E that constitute the lower staircase stringer extension 20A. Then, the upper end of the right stringer 30 is fixed to the design mounting position on the upper floor, and the right second plate-shaped member 30E and the left and right first plate-shaped members 20E, 20E are joined using the joining means 7.

[0020] Specifically, in the upper member installation step, the left second plate-shaped member 30E and the left and right first plate-shaped members 20E, 20E are joined using the upper opening slit 25 and the lower opening slit 35 and the joining means 7, and the right second plate-shaped member 30E and the left and right first plate-shaped members 20E, 20E are joined using the upper opening slit 25 and the lower opening slit 35 and the joining means 7. As a result, the installation of the stringers 20, 20 of the lower staircase 2 and the stringers 30, 30 of the upper staircase 3 is completed, and the framework 5 of the lattice-shaped landing 4 is completed.

[0021] Then, the plate portion 6 is placed on the completed frame 5, and the plate portion 6 is fixed to the plate portion mounting members 56, 56... provided on the frame 5 using fastening means such as screws (not shown). Furthermore, the plate mounting member 56 is composed of an L-shaped plate member with a cross-section, provided so that its plate surface is in contact with the lower surface of the plate portion 6, as shown in Figures 2 and 3, for example, and is attached to the left first plate member 20E and the left and right second plate members 30E, 30E respectively by fastening means such as welding or bolts and nuts. Furthermore, the treads 21, 21... and handrail 22 of the lower staircase 2 are installed, as well as the treads 31, 31... and handrail 32 of the upper staircase 3. With the above steps, the L-shaped staircase 1 is completed.

[0022] In the first embodiment of the L-shaped staircase 1, the frame 5 is composed of a grid-like frame 50 formed by combining the lower staircase stringer extension 20A and the upper staircase stringer extension 30A, and a joining means 7 that joins the first plate-like member 20E and the second plate-like member 30E that constitute the frame 50, thus providing a L-shaped staircase 1 with excellent constructability.

[0023] In particular, by forming an upper opening slit 25 extending downward from the upper edge 20y of the first plate-shaped member 20E constituting the lower staircase stringer extension 20A, and a lower opening slit 35 extending upward from the lower edge 30z of the second plate-shaped member 30E constituting the upper staircase stringer extension 30A, the assembly accuracy and constructability of the lower staircase stringer extension 20A and the upper staircase stringer extension 30A are improved, and the constructability when constructing the frame 5 is also improved.

[0024] Furthermore, the positioning of the stringers 20,20 of the lower staircase 2 and the stringers 30,30 of the upper staircase 3 can now be easily performed, making the construction of the L-shaped staircase quick and easy.

[0025] Embodiment 2 In Embodiment 1, the frame 5 was exemplified as being composed of a well-shaped frame 50 formed by combining the lower staircase stringer extension 20A and the upper staircase stringer extension 30A. However, as shown in Figure 5, the frame 5A may be formed of a square frame formed by connecting the lower staircase stringer extension 8 and the upper staircase stringer extension 9, and fixed to the building's floor (floor structure) F (see Figure 1) via support columns 10, 10....

[0026] In the L-shaped staircase 1 according to Embodiment 2, as shown in Figure 5, the lower staircase stringer extension 8 comprises a left extension (one extension) 8L formed to extend integrally with the left stringer 20 of the lower staircase 2, and a right extension (the other extension) 8R formed to extend integrally with the right stringer 20 of the lower staircase 2. The upper staircase stringer extension 9 comprises a left extension (one extension) 9L formed to extend integrally with the left stringer 30 of the upper staircase 3, and a right extension (the other extension) 9R formed to extend integrally with the right stringer 30 of the upper staircase 3.

[0027] The left extension 8L, which constitutes the lower staircase stringer extension 8, is composed of a plate-shaped member 80 integrally provided to extend from the upper end of the left stringer 20 of the lower staircase 2, and a connecting plate 81 provided at the extended end of the plate-shaped member 80. The plate-like member 80 is, for example, a plate-like member such as a flat plate having plate surfaces that extend in the horizontal and vertical directions, and whose upper and lower edges, which are parallel to each other, extend in the horizontal direction. The joining plate 81 is formed so that its surface is perpendicular to the surface of the plate-shaped member 80. The connecting plate 81 is formed, for example, by bending the extended end of the plate-shaped member 80 at a right angle, or by integrally molding it with the plate-shaped member 80. For example, the left stringer beam 20 and the plate-shaped member 80 of the left extension 8L are made from a single flat plate. The right-side extension 8R, which constitutes the lower staircase stringer extension 8, is made up of a connecting plate 82 that is integrally provided to extend from the upper end side of the right stringer 20 of the lower staircase 2. The joining plate 82 is formed so that its surface is perpendicular to the surface of the stringer beam 20. The connecting plate 82 is formed, for example, by bending a plate portion that protrudes from the extended end of the stringer beam 20 at a right angle, or by integrally molding it with the stringer beam 20.

[0028] The left extension 9L, which constitutes the upper staircase stringer extension 9, is composed of a plate-shaped member 90 and a connecting plate 91, which are integrally provided to extend from the lower end side of the left stringer 30 of the upper staircase 3. The plate-like member 90 is, for example, a plate-like member such as a flat plate having plate surfaces that extend in the horizontal and vertical directions, and whose upper and lower edges, which are parallel to each other, extend in the horizontal direction. For example, the left stringer beam 30 and the left extension 9L plate-shaped member 90 are made from a single flat plate. The joining plate 91 is formed so that its surface is perpendicular to the surface of the plate-shaped member 90. The connecting plate 91 is joined to the plate-shaped member 90 by welding or the like, or is integrally molded with the plate-shaped member 90, so that it is located at the boundary between the landing and the upper staircase on the plate-shaped member 90. The right-side extension 9R, which constitutes the upper staircase stringer extension 9, is composed of a plate-shaped member 90 integrally provided to extend from the lower end side of the right stringer 30 of the upper staircase 3, and a connecting plate 92 and a connecting plate 93 provided at the extended end of the plate-shaped member 90. For example, the right stringer beam 30 and the plate-shaped member 90 of the right extension 9R are made from a single flat plate. The joining plate 92 is formed so that its surface is perpendicular to the surface of the plate-shaped member 90. The joining plate 92 is formed, for example, by bending the extended end of the plate-shaped member 90, or by integrally molding it with the plate-shaped member 90. The joining plate 93 is formed so that its surface is perpendicular to the surface of the plate-shaped member 90. The joining plate 93 is joined to the plate-shaped member 90 by welding or the like, or is integrally molded with the plate-shaped member 90, so that it is located at the boundary between the landing and the upper staircase on the plate-shaped member 90.

[0029] Next, an example of a method for constructing the framework of the landing of the L-shaped staircase 1 according to Embodiment 2 will be described. First, the three support columns 10, 10, 10 for supporting the landing 4 are fixed to the design mounting positions of the floor (floor structure) F. Next, the left upper member, which is an integrated unit consisting of the left stringer 30 and the left extension 9L of the upper staircase 3, is installed, and the right upper member, which is an integrated unit consisting of the right stringer 30 and the right extension 9R of the upper staircase 3, is installed. Specifically, the upper end of the left stringer 30 of the upper staircase 3 is fixed to the design mounting position on the upper floor, and the plate-shaped member 90 of the left extension 9L is fixed to the upper ends of the two support columns 10, 10 on the wall W side with bolts and nuts, etc. Furthermore, the upper end of the right stringer 30 of the upper staircase 3 is fixed to the design mounting position on the upper floor, and the plate-shaped member 90 of the right extension 9R is fixed to the upper end of the remaining support column 10 with bolts and nuts, etc. Furthermore, the connecting plate 95 is joined to the connecting plate 91 of the left extension 9L and the connecting plate 93 of the right extension 9R using bolts and nuts, thereby connecting the left extension 9L and the right extension 9R with the connecting plate 95.

[0030] Then, the left lower member, which is an integrated unit consisting of the left stringer 20 and the left extension 8L of the lower staircase 2, is installed, and the right lower member, which is an integrated unit consisting of the right stringer 20 and the right extension 8R of the lower staircase 2, is installed. Specifically, the surface of the plate-shaped member 80 of the left extension 8L and the connecting plate 92 of the right extension 9R are joined with bolts and nuts, and the connecting plate 81 of the left extension 8L and the extension end side of the plate-shaped member 90 of the left extension 9L are joined with bolts and nuts. Furthermore, the upper end of the right stringer 20 of the lower staircase 2 is fixed to the support column 10 with bolts and nuts, and the connecting plate 82, which is the right extension 8R, and the plate-shaped member 90, which is the right extension 9R, are joined together with bolts and nuts. As described above, the frame 5A is formed by connecting the lower staircase stringer extension 8 and the upper staircase stringer extension 9.

[0031] According to Embodiment 2, the L-shaped staircase 1 is made easier to construct by connecting the lower staircase stringer extension 8, which is integrally formed with the stringer 20 of the lower staircase 2, and the upper staircase stringer extension 9, which is integrally formed with the stringer 30 of the upper staircase 3, thereby providing a L-shaped staircase 1 with excellent constructability.

[0032] Embodiment 3 Embodiments 1 and 2 illustrate a single-step landing frame structure, but a double-step landing frame structure can also be constructed. As shown in Figure 6, the framework 5B of the two-tiered landing according to Embodiment 3 is composed of a frame 50B formed by connecting the lower staircase stringer extension 8 and the upper staircase stringer extension 9, and is supported by columns 10, 10, 10.

[0033] Embodiment 4 Furthermore, a three-tiered landing structure can also be constructed. As shown in Figure 7, the framework 5C of the three-tiered landing according to Embodiment 4 is composed of a frame 50C formed by connecting the lower staircase stringer extension 8 and the upper staircase stringer extension 9, and is supported by columns.

[0034] In Figures 6 and 7, parts identical to or corresponding to those in Figure 5 are denoted by the same reference numerals, and their descriptions are omitted.

[0035] In other words, in the frame 5B, in order to create a two-step landing, the left extension (one extension) 9L that constitutes the upper staircase stringer extension 9 is equipped with a plate-shaped member 90 whose extension end is formed into a step-down plate section 90a, and the right extension (the other extension) 9R is equipped with a plate-shaped member 90 whose upper and lower edges are formed into a step-down staircase edge 90b. Furthermore, in the frame structure 5C, in order to create a three-step landing, the left extension (one extension) 9L that constitutes the upper staircase stringer extension 9 is equipped with a plate-shaped member 90 whose upper and lower edges are formed on a stepped edge 90c that is one step lower, the right extension (one extension) 9R is equipped with a plate-shaped member 90 whose upper and lower edges are formed on a stepped edge 90d that is two steps lower, and the left extension (one extension) 8L that constitutes the lower staircase stringer extension 8 is equipped with a plate-shaped member 90 whose upper and lower edges on the extension end are formed on a stepped edge 80e that is one step higher.

[0036] Furthermore, the construction methods for frame structures 5B and 5C are the same as those for frame structure 5A of the single-step landing described above, so the explanation will be omitted.

[0037] According to the L-shaped staircase 1 of Embodiments 3 and 4, similar to the L-shaped staircase 1 of Embodiment 2, by connecting the lower staircase stringer extension 8, which is integrally formed with the stringer 20 of the lower staircase 2, and the upper staircase stringer extension 9, which is integrally formed with the stringer 30 of the upper staircase 3, the frame 5B and frame 5C can be easily constructed, and a L-shaped staircase 1 with excellent constructability can be provided.

[0038] Furthermore, in the L-shaped staircase 1 of embodiments 2 to 4 shown in Figures 5, 6, and 7, a configuration in which the frame is supported by three support columns 10 is illustrated. However, in embodiments 2 to 4, the frame may be supported by four support columns 10, or by two support columns.

[0039] Embodiment 5 In Embodiment 1, a frame structure 5 was illustrated in which the extended end of the lower staircase stringer extension is fixed to the building wall (wall structure) W via a mounting member 20H. However, the frame structure configured in the grid pattern described in Embodiment 1 may also be fixed to the building floor (floor structure) F via support columns. In this case, as described in Embodiments 2 and 3, the frame may be supported by three support columns, or it may be supported by four or two support columns.

[0040] Embodiment 6 In embodiments 2, 3, and 4, a configuration in which the frame structures 5A, 5B, and 5C are supported by the support columns 10 is illustrated. However, instead of supporting the frame structures 5A, 5B, and 5C with the support columns 10, they may be fixed to the building wall (wall structure) W. [Explanation of Symbols]

[0041] 1. L-shaped staircase 2 lower stairs 3 Upper stairs 4 Landing 5. The framework of the landing 6. The wooden part of the landing 7 Joining means 20 Stringer of the lower staircase 20A Lower staircase stringer extension 20E First plate-shaped member 25 Upper opening slit 30. Stringer of the upper staircase 30A Upper staircase stringer extension 30E Second plate-shaped member 35 Lower opening slit 50 Lattice-shaped frame

Claims

1. A L-shaped staircase comprising a lower staircase, an upper staircase, and a landing provided between the lower and upper staircases, The landing is constructed with a frame and a board section installed on top of the frame. The frame of this L-shaped staircase is characterized by being constructed by connecting an extended lower staircase stringer section, which is an extension of the lower staircase stringer, with an extended upper staircase stringer section, which is an extension of the upper staircase stringer.

2. The L-shaped staircase according to claim 1, characterized in that the extended end of the lower staircase stringer extension is fixed to the building wall via a mounting part.

3. The L-shaped staircase according to claim 1, characterized in that the frame is fixed to the floor of the building via support columns.

4. The lower staircase stringer extension is formed integrally with the lower staircase stringer and consists of a pair of left and right first plate-like members, each having a plate surface that extends vertically and horizontally, with an upper and lower edge parallel to each other that extends horizontally. The upper staircase stringer extension is formed integrally with the upper staircase stringer and has plate surfaces that extend vertically and horizontally, and is composed of a pair of left and right second plate-like members, with mutually parallel upper and lower edges that extend horizontally. The first plate-like member has an upper opening slit that extends downward from the upper edge of the first plate-like member. The second plate-like member has a lower opening slit that extends upward from the lower edge of the second plate-like member. The frame is, The upper opening slit of the first plate-shaped member and the lower opening slit of the second plate-shaped member are fitted together, and the plate portion located below the upper opening slit of the first plate-shaped member is inserted into the lower opening slit of the second plate-shaped member, and the plate portion located above the lower opening slit of the second plate-shaped member is inserted into the upper opening slit of the first plate-shaped member, thereby combining the first plate-shaped member and the second plate-shaped member to form a frame in a grid pattern where the plate surfaces of the first plate-shaped member and the plate surfaces of the second plate-shaped member are perpendicular to each other. A joining means for joining the first plate-shaped member and the second plate-shaped member at the intersection of the first plate-shaped member and the second plate-shaped member in the frame, such that the upper edge of the first plate-shaped member and the upper edge of the second plate-shaped member of the frame are positioned on the same horizontal plane, A L-shaped staircase according to any one of claims 1 to 3, characterized by being configured to include the following:

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