Spiral Stage

Abstract

To provide spiral stairs having a step board with high strength while preventing an accident of falling to the outside.SOLUTION: Spiral stairs have a foundation 1, a support pole 2, a plurality of step boards 3 and a plurality of stringers 4. The support pole 2 is erected on the foundation 1. Each step board 3 is in a long plate-like shape, has an insertion hole penetrating in a thickness direction at one end in a longitudinal direction and has the support pole 2 inserted into the penetration hole. Each step board 3 is spirally arranged and shifted in the same rotational direction so that it is partially overlapped and supported each other from the lowest stage to the uppermost stage on the foundation 1. Each stringer 4 is erected on the foundation 1 and connects and supports the other end in the longitudinal direction of the plurality of step boards 3 arranged at an interval in a vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a spiral staircase. [Background technology]

[0002] A conventional spiral staircase has been disclosed in which treads with holes for inserting a central pillar formed at the end of the center of the staircase are arranged in a spiral shape around an upright central pillar (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-78313 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the spiral staircase described in Patent Document 1 has a handrail attached to a handrail post that stands on the tread, but there is a risk of people falling over the handrail when using it. Also, because the tread is supported by the central pillar at the inside end and not at the outside end, there is also the problem that the strength is weak when a load is applied to the outside.

[0005] The present invention has been made in response to such problems, and aims to provide a spiral staircase that prevents accidents such as falling outside and has strong treads. [Means for solving the problem]

[0006] In order to achieve the above object, the spiral staircase of the present invention comprises a foundation, support posts, a plurality of treads, and a plurality of vertical members, the support posts being erected on the foundation, each of the treads being in the shape of an inverted box, with sides of the same height around the periphery of the elongated top surface, and an insertion hole penetrating in the thickness direction at one end in the longitudinal direction, the support posts being inserted into the insertion hole, and the treads are supported on the foundation from the lowest step to the highest step with some overlapping and arranged in a spiral with offsets in the same rotational direction, and each vertical member being erected on the foundation and arranged at the other end in the longitudinal direction of the plurality of treads arranged at intervals above and below. The above aspect are connected and supported at the side The side surface of the other end of the step is fixed to the vertical member by a bolt. This is a feature of the system.

[0007] In the spiral staircase of the present invention, the treads are surrounded by the vertical members, preventing them from falling off during use. In addition, the treads are supported on the foundation by inserting posts into insertion holes at one end of the longitudinal direction, and the other end of the longitudinal direction is connected to the side of the vertical member for support, so the strength of the treads is high even on the outside.

[0008] The spiral staircase of the present invention preferably has rings at the top and bottom ends of each vertical member to connect them, certain vertical members and certain treads are fixed to the wall of a building, and has an access opening on the side facing the lowest tread. The vertical members are removed from the opening. The opening may be provided with an openable door.

[0009] In this case, the upper ends of the vertical members are connected with rings, which increases the strength of the vertical members. Furthermore, certain vertical members and certain treads are fixed to the wall of the building, which increases the strength of the entire spiral staircase. In addition, it is possible to enter and exit the interior through an opening. The posts, treads, and vertical members are preferably made of lightweight non-ferrous metals such as FRP or aluminum, or high-strength engineering plastics, which increases the strength of the main body while reducing its weight. The support pillars may be configured by connecting a plurality of pillars vertically.

[0010] The spiral staircase of the present invention may be configured such that multiple spiral staircases are connected vertically, and the treads of the uppermost and lowermost spiral staircases are arranged in a spiral shape with the treads of the lower spiral staircase partially overlapping and offset in the same rotational direction. In this case, since the spiral staircase is configured by connecting multiple spiral staircases vertically, it is possible to easily construct a long spiral staircase by preparing multiple spiral staircases of a predetermined length in advance and connecting them vertically on site. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a spiral staircase that prevents accidents of people falling outside and has strong treads. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a front view showing a spiral staircase according to an embodiment of the present invention. [Figure 2] FIG. 2 is a view of the spiral staircase shown in FIG. 1 taken along line AA. [Figure 3] FIG. 2 is a plan view of the spiral staircase shown in FIG. 1. [Figure 4] 2A is a plan view of the tread of the spiral staircase shown in FIG. 1, (B) is a right side view, and (C) is a plan view. [Figure 5] FIG. 2 is an explanatory diagram showing the relationship between the treads and vertical members of the upper and lower steps of the spiral staircase shown in FIG. 1. [Figure 6] (A) Front view, (B) left side view, and (C) plan view showing the door of the spiral staircase shown in Figure 1. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 6 show a spiral staircase according to an embodiment of the present invention. As shown in Figures 1 and 2, the spiral staircase has a base 1, pillars 2, a plurality of treads 3, a plurality of vertical members 4, rings 5, and a door 6. The pillars 2, treads 3, vertical members 4, rings 5, and door 6 are made of FRP.

[0014] The foundation 1 is made of a thick disc-shaped concrete 12 laid on crushed stone 11 or the like. A hole 13 for supporting the support column 2 is formed in the center of the plane of the concrete 12. The support pillar 2 is made of a cylindrical straight rod, the lower end of which is supported by a hole 13, and is erected on the foundation 1 and fixed to the concrete 12 therein.

[0015] As shown in Figures 3 to 5, each step 3 has an elongated top surface, specifically a sector shape with a central angle of approximately 20 to 45 degrees, preferably approximately 30 degrees. Each step 3 is shaped like an inverted box, with side surfaces 32 of the same height around the periphery of the top surface 31. Each step 3 has an insertion hole 33 with a circular cross section that penetrates through the thickness direction at one end of the narrowing side of the sector of the top surface 31. A tubular portion 34 of the same height as the side surface 32 is integrally connected to the insertion hole 33 perpendicular to the top surface 31. Each step 3 has internal ribs to increase its strength. Each step 3 has a support 2 inserted into an insertion hole 33. As shown in Figures 3 and 5, the steps 3 are supported on the base 1 with some overlapping from the bottom to the top, and are arranged in a spiral shape with a predetermined angle, preferably staggered by 30 degrees, in the same rotational direction. If the steps 3 are staggered by 30 degrees, the structure will have 12 steps that make one revolution.

[0016] Each vertical member 4 is made of a square pipe and stands on the foundation 1. As shown in Figure 4, each vertical member 4 connects to the side to support the other longitudinal ends of multiple treads 3, which are arranged at intervals above and below. The three lowest treads 3 are fixed with bolts from the outside of the vertical member 4, and higher treads 3 have nuts embedded in the vertical member 4 and are fixed with bolts from the inside of the tread 3. The multiple vertical members 4 surround the tread 3, for example, 24 members in a circumference.

[0017] As shown in FIG. 3, a predetermined vertical member 4 and a predetermined step 3 facing the wall side are fixed to the wall of the building by a bracket 41. Rings 5 ​​are attached to the upper and lower ends of each vertical member 4, connecting them together. The upper ring 5 has a U-shaped cross section and is fixed to the vertical member 4 with bolts from the inside of the spiral staircase. The lower ring 5 is made of an angle member with an L-shaped cross section and is fixed to the vertical member 4 with bolts from the outside of the spiral staircase. On the side facing the lowest tread 3, the vertical members 4 are removed at a predetermined height to provide an opening 42 for access. A horizontal member 43 is fixed to the lower ends of the vertical members 4 at the position of the opening 42. A door 6 (see Figure 6) that can be opened and closed by a hinge 61 is provided in the opening 42. The door 6 is a rectangular plate with a key 62 on its vertical edge.

[0018] In this spiral staircase, the treads 3 are surrounded by the vertical members 4, preventing them from falling outside during use. In addition, the treads 3 are supported on the foundation 1 by inserting the support posts 2 into the insertion holes 33 at one end of the longitudinal direction, and the other end of the longitudinal direction is connected to the side of the vertical members 4 for support, so the strength of the treads 3 is high even on the outside. In this spiral staircase, the upper and lower ends of each vertical member 4 are connected by rings 5, which gives the vertical members 4 great strength. Furthermore, certain vertical members 4 and certain treads 3 are fixed to the building wall, which increases the strength of the entire spiral staircase. People can also enter and exit the interior through a door 6 in the opening 42. The spiral staircase according to the embodiment of the present invention is attached to, for example, a bridge pier. [Explanation of symbols]

[0019] 1 foundation, 2 support posts, 3 treads, 4 vertical members, 5 rings, 6 doors, 11 crushed stone, 12 concrete, 13 hole, 31 top surface, 32 side, 33 insertion hole, 34 barrel, 41 bracket, 42 opening, 43 cross member, 61 hinge, 62 key

Claims

1. The structure has a foundation, a support, a plurality of treads, and a plurality of vertical members, The support pillar is erected on the foundation, Each step is in the shape of an inverted box, has sides of the same height around the periphery of its elongated top surface, has an insertion hole at one end in the longitudinal direction that penetrates in the thickness direction, and the support is inserted into the insertion hole, and is supported on the base from the bottom to the top with some overlapping and arranged in a spiral with a shift in the same rotational direction, Each vertical member is erected on the foundation and connects and supports the side surfaces of the other ends of the plurality of treads arranged at intervals in the vertical direction at their sides, and the side surfaces of the other ends of the treads are fixed to the vertical members by bolts. A distinctive spiral staircase.

2. each of the longitudinal members has a ring at its upper end and lower end that joins the longitudinal members together; the predetermined vertical members and the predetermined treads are fixed to a wall of the building; The side facing the lowest step has an opening for easy access.

2. The spiral staircase according to claim 1.

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