JP7760149B2 - spiral staircase - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies ・Exhibition name: Construction technology exhibition “EE Tohoku ’21” ・Exhibition date: June 21, 2021

The present invention relates to a spiral staircase.

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

JP 2017-78313 A

However, the spiral staircase described in Patent Document 1 has handrails attached to handrail posts that are erected on the treads, but there is a risk of people falling over the handrail when using it. Furthermore, because the treads are supported by the central pillar at the inner end and not at the outer end, there is also the issue of their strength being weak when a load is applied to the outside.

The present invention was developed to address these issues, and aims to provide a spiral staircase that prevents accidents such as falling outside and has strong treads.

In order to achieve the above-mentioned 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 tread being shaped like an inverted box, with sides of the same height around the periphery of its long top surface, and having an insertion hole penetrating through the thickness direction at one end of its length, the support posts being inserted into the insertion hole, and the treads being supported on the foundation from the lowest to the highest step with some overlapping and arranged in a spiral with offset in the same rotational direction, each vertical member being erected on the foundation and connecting and supporting the side faces of the other longitudinal ends of the plurality of treads arranged at intervals above and below, and the side faces of the other ends of the treads being fixed to the vertical members with bolts .

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

The spiral staircase of the present invention preferably has rings at the upper and lower ends of each vertical member that connect the vertical members, 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 also be equipped with an openable door.

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 and 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.

The spiral staircase of the present invention may be configured such that multiple spiral staircases are connected vertically, and the treads of the topmost step of the lower spiral staircase and the bottommost step of the upper spiral staircase are arranged in a spiral pattern with partial overlap and offset in the same rotational direction. In this case, since multiple spiral staircases are connected vertically, long spiral staircases can be easily constructed by preparing multiple spiral staircases of a specified length in advance and connecting them vertically on site.

This invention provides a spiral staircase that prevents accidents such as falling outside and has strong treads.

1 is a front view showing a spiral staircase according to an embodiment of the present invention. 2 is a view of the spiral staircase shown in FIG. 1 taken along line AA. FIG. 2 is a plan view of the spiral staircase shown in FIG. 1. 2A is a plan view of a tread of the spiral staircase shown in FIG. 1, FIG. 2B is a right side view, and FIG. 2C is a plan view. 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. 2A is a front view, FIG. 2B is a left side view, and FIG. 2C is a plan view showing the door of the spiral staircase shown in FIG. 1.

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.
1 and 2, the spiral staircase has a base 1, columns 2, a plurality of treads 3, a plurality of vertical members 4, rings 5, and a door 6. The columns 2, treads 3, vertical members 4, rings 5, and door 6 are made of FRP.

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 post 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.

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 surrounding the top surface 31. Each step 3 has an insertion hole 33 with a circular cross section that penetrates through the thickness of the top surface 31 at one end of the narrowing side of the sector. 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 with a predetermined angle, preferably 30 degrees, offset in the same rotational direction. If the steps 3 are offset by 30 degrees, the structure will have 12 steps that make one revolution.

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 and supports the other longitudinal ends of multiple treads 3, which are spaced apart vertically. The three lowest treads 3 are secured to the vertical member 4 with bolts from the outside, while higher treads 3 have nuts embedded in the vertical member 4 and are secured to the treads 3 with bolts from the inside. The multiple vertical members 4 surround the tread 3, for example, with 24 members in a circumference.

As shown in FIG. 3, a predetermined vertical member 4 and a predetermined tread 3 facing the wall side are fixed to the wall of the building by brackets 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 at the opening 42. The door 6 is a rectangular plate with a key 62 on its vertical edge.

This spiral staircase prevents accidents of the treads 3 falling outside during use because they are surrounded by the vertical members 4. Furthermore, 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.
This spiral staircase has high strength because the upper and lower ends of each vertical member 4 are connected by rings 5. Furthermore, certain vertical members 4 and certain treads 3 are fixed to the building wall, which increases the strength of the entire spiral staircase. Also, people can 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.

1 Foundation, 2 Support, 3 Step, 4 Vertical member, 5 Ring, 6 Door, 11 Crushed stone,
12 concrete, 13 hole, 31 top surface, 32 side surface, 33 insertion hole,
34 Cylinder portion, 41 Bracket, 42 Opening, 43 Horizontal member, 61 Hinge, 62 Key portion

Claims (2)

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. 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.