JP7745375B2 - Stringer Staircase - Google Patents

Description

The present invention relates to stringer stairs.

A stringer staircase is known that comprises a stringer and multiple treads supported by the stringer (see, for example, Patent Documents 1 to 3).

JP 2014-047526 A Japanese Patent Application Laid-Open No. 2015-135022 Japanese Patent Application Laid-Open No. 2006-009360

From a design perspective, it is possible to make stringer stairs thinner when viewed from the side. However, making stringer stairs thinner when viewed from the side could increase the vibration of the stringer stairs.

The present invention takes the above into consideration and aims to suppress the vibration of stringer stairs while making them appear thinner when viewed from the side.

The stringer staircase of the first aspect comprises a stringer, a plurality of treads arranged in a stepped manner on the stringer and extending on both sides from the stringer, and a handrail support arranged along the tip of the tread extending from the stringer, extending downward from the tip, and having its lower end positioned above the lower end of the stringer.

In the first aspect of the stringer staircase, the treads are arranged in a stepped manner on the stringers and extend from both sides of the stringers. The handrail support is provided along the tip of the tread that extends from the stringers.

Here, the handrail support extends downward from the tips of the multiple treads, with its lower end positioned higher than the lower end of the stringer. As a result, in this invention, the thickness of the stringer staircase is thinner in side view compared to when the lower end of the handrail support is positioned at the same height as the lower end of the stringer.

In addition, the lower end of the stringer is positioned further back than the lower end of the handrail support (towards the center of the stringer staircase). This makes the lower end of the stringer less visible and less noticeable when viewed from the side. Therefore, this invention makes the stringer staircase appear thinner when viewed from the side, thereby enhancing the design of the stringer staircase.

On the other hand, the lower end of the stringer is positioned lower than the lower end of the handrail support. In other words, the vertical width (beam depth) of the stringer is wider than the vertical width (beam depth) of the handrail support. As a result, in this invention, vibration of the stringer staircase is suppressed compared to when the vertical width of the stringer is narrowed and the lower end of the stringer is positioned at the same height as the lower end of the handrail support.

In this way, the present invention can suppress the vibration of stringer stairs while making the stringer stairs appear thinner when viewed from the side.

The stringer staircase of the second aspect is the stringer staircase of the first aspect , but is provided with a plurality of risers that are arranged on the stringers, extend on both sides from the stringers, connect adjacent treads above and below, and form a stepped cross section together with the treads.

In the stringer staircase of the second aspect , a plurality of risers are provided on the stringers. The risers extend from both sides of the stringers and connect adjacent treads vertically. This creates a stepped cross section with the plurality of treads and risers.

By forming a stepped cross section using multiple treads and risers in this way, the bending rigidity of the multiple treads and risers extending out from the stringers on both sides can be increased. This allows the treads and risers to extend out from the stringers on both sides to a greater extent.

In other words, with this invention, the stringers can be positioned closer to the center of the treads. As a result, the lower ends of the stringers are less noticeable when viewed from the side, making the stringer staircase appear even thinner.

The stringer staircase of the third aspect is a stringer staircase of the first or second aspect , which is provided with a panel-shaped handrail supported by the handrail support portion, and the handrail support portion has a U-shaped cross section that is open at the top and has a storage portion that stores the lower end of the panel-shaped handrail.

In the stringer staircase according to the third aspect , the handrail support has a receiving portion with a U-shaped cross section that is open at the top. The lower end of the panel-shaped handrail is received in this receiving portion, so that the panel-shaped handrail is supported by the handrail support.

By storing the lower end of the panel-shaped handrail in the handrail receiving section's storage compartment in this way, the panel-shaped handrail can be easily attached to stringer stairs.

As described above, the present invention makes it possible to suppress the vibration of stringer stairs while making the stringer stairs appear thinner when viewed from the side.

FIG. 1 is a side view of one embodiment of a stringer staircase. 2 is a cross-sectional view taken along line 2-2 of FIG. 1. FIG. 2 is an enlarged side view of the stringer shown in FIG. 1 . 3 is an enlarged cross-sectional view showing the handrail support portion shown in FIG. 2.

Below, we will explain one embodiment of a stringer staircase with reference to the drawings.

(Stringer Stairs)
Figure 1 shows a stringer staircase 10 according to this embodiment. The stringer staircase 10 is a steel-framed staircase. The stringer staircase 10 is installed diagonally on upper and lower structural members (not shown), such as beams and slabs.

As shown in Figure 2, the stringer staircase 10 comprises a pair of stringers 20, a plurality of treads 30, a plurality of risers 32 (see Figure 3), a pair of handrail supports 40, and a pair of glass handrails 60.

(stringer)
The pair of stringers 20 are made of metal plates such as steel plates and are installed diagonally on the upper and lower structural members (not shown) described above. The pair of stringers 20 are arranged along the length of the stringer staircase 10 (the direction of the arrow X) with their thickness direction aligned with the width of the stringer staircase 10 (the direction of the arrow Y). The pair of stringers 20 are arranged facing each other across the width of the stringer staircase 10.

As shown in Figure 3, in side view, the lower end 20L of the stringer 20 extends linearly along the longitudinal direction of the stringer staircase 10 (in the direction of arrow X) and is inclined relative to the horizontal plane in accordance with the gradient of the stringer staircase 10. Meanwhile, in side view, the upper part of the stringer 20 is formed with a plurality of stepped (lightning bolt-shaped) steps 22. Each step 22 has an upper end surface 22U that supports a tread 30 and a side end surface 22S that supports a riser 32.

(Steps and risers)
The treads 30 and risers 32 are formed of metal plates such as steel plates, and are arranged on a pair of stringers 20 with their longitudinal direction aligned with the width direction of the stringer staircase 10 (the direction of arrow Y in Figure 2).

The tread 30 is positioned approximately horizontally and is joined by welding or the like while overlapping the upper end surface 22U of the step portion 22. On the other hand, the riser 32 is positioned approximately vertically and is joined by welding or the like while overlapping the side end surface 22S of the step portion 22.

The multiple treads 30 and risers 32 are integrated. These treads 30 and risers 32 form a stepped cross section that conforms to the multiple steps 22 of the stringer 20. Specifically, the treads 30 and risers 32 are integrally formed by bending a single metal plate 34 into an L-shape.

In one metal plate 34, the lower end of the riser plate 32 is integrally connected to the end of the tread 30 via a bent portion. Meanwhile, the upper end of the riser plate 32 is butted against the end of the tread 30 of another adjacent metal plate 34, and joined (connected) by welding (continuous welding) or the like. In this way, the riser plate 32 connects the vertically adjacent treads 30. As a result, the corners (bent portions and joints) of the integrated treads 30 and riser plate 32 increase the bending rigidity (out-of-plane rigidity) of the treads 30 and riser plate 32.

In this embodiment, the tread 30 and riser 32 are integrally formed by bending a single metal plate 34 into an L-shape. However, the tread 30 and riser 32 may be separate pieces and then integrated by welding or the like.

As shown in Figure 2, each tread 30 is positioned across a pair of stringers 20. Each tread 30 extends from the pair of stringers 20 on both sides of the stringer staircase 10 in the width direction (arrow Y direction). In other words, the pair of stringers 20 are positioned away from the longitudinal end (tip 30T) of each tread 30 toward the center, supporting the longitudinal middle of each tread 30.

In this embodiment, the stringers 20 are positioned toward the center of each tread 30 from both longitudinal ends (tips 30T) of the tread 30, at a distance of at least one-third of the longitudinal length L of the tread 30. Although not shown, the risers 32, like the treads 30, extend out from the pair of stringers 20 on both sides of the stringer staircase 10 in the width direction.

(Handrail support)
A handrail support 40 is provided at each end 30T on both sides of the step 30 that extends from the stringer 20. The handrail support 40 is provided along the end 30T of the step 30. The handrail support 40 also extends downward from the end 30T of the step 30, with the lower end 40L positioned above the lower end 20L of the stringer 20.

As shown in Figure 4, the handrail support 40 has a storage section 40V that stores the lower end 60L of the glass handrail 60. Specifically, the handrail support 40 has a U-shaped cross section that is open at the top. This handrail support 40 has a pair of inner and outer plates 50 and 52, and a bottom plate 54.

The pair of inner and outer plates 50 and 52 are formed from metal plates such as steel plates, and face each other in the width direction (arrow Y direction) of the stringer staircase 10. The outer plate 52 is positioned outside the inner plate 50.

The lower ends of the pair of inner and outer plates 50 and 52 are connected via a bottom plate 54. The inner plate 50, outer plate 52, and bottom plate 54 form a storage section 40V. The lower end 60L of the glass handrail 60 is stored (fitted) in this storage section 40V via a sealing material or the like (not shown).

The bottom plate 54 is formed from a metal plate such as a steel plate and is arranged approximately horizontally. One end of the bottom plate 54 is joined by welding (fillet welding) or the like while abutting against the inner surface 50A of the lower end of the inner plate 50. The other end of the bottom plate 54 is joined by welding (groove welding) or the like while abutting against the inner surface 52A of the lower end of the outer plate 52. A groove 56 is formed on the underside of the other end of the bottom plate 54.

The inner plate 50 is positioned outside the tip 30T of the tread 30 and the tip of the riser plate 32 (not shown). The outer surface 50B of the upper part of this inner plate 50 is butted against the tip 30T of the tread 30 and the tip of the riser plate 32 (not shown) and joined by welding (continuous welding) or the like. In this way, the handrail support 40 is supported by multiple treads 30 and risers 32.

In this embodiment, the upper ends of the inner and outer plates 50 and 52 protrude higher than the tread 30. However, the upper ends of the inner and outer plates 50 and 52 may also be positioned at the same height as the tread 30.

As shown in Figure 1, in a side view, the lower ends of the pair of inner and outer panels 50 and 52, i.e., the lower end 40L of the handrail support portion 40, extend linearly along the longitudinal direction of the stringer staircase 10 (direction of arrow X).

On the other hand, from a side view, multiple steps 42 are formed on the upper parts of the pair of inner and outer plates 50 and 52, i.e., the upper parts of the handrail support parts 40, from a design perspective. The multiple steps 42 are formed in a staircase (lightning bolt) shape along the steps 22 of the stringer 20. Note that the upper end of the handrail support part 40 may also be linear, extending, for example, along the longitudinal direction (direction of arrow X) of the stringer staircase 10.

(glass handrail)
The glass handrail 60 is made of, for example, transparent plate glass, etc. The upper end 60U of the glass handrail 60 extends linearly in the longitudinal direction of the stringer staircase 10 (the direction of the arrow X) and is inclined relative to the horizontal plane according to the gradient of the stringer staircase 10.

The lower end 60L of the glass handrail 60 (see Figure 2) extends linearly in the longitudinal direction of the stringer staircase 10 (direction of arrow X) and is inclined relative to the horizontal plane in accordance with the gradient of the stringer staircase 10.

As shown in Figure 2, the lower end 60L of the glass handrail 60 is housed in the handrail support 40 on both sides of the stringer staircase 10. The glass handrails 60 also extend upward from the handrail support 40 on both sides of the stringer staircase 10. These glass handrails 60 face each other in the width direction (arrow Y direction) of the stringer staircase 10. The glass handrails 60 are an example of a panel-type handrail.

(Finishing materials)
A central finishing material 70 and a pair of outer finishing materials 72 are attached to the underside of the stringer staircase 10. The central finishing material 70 and the pair of outer finishing materials 72 are formed, for example, from wood panels or the like.

The central finishing material 70 is positioned approximately horizontally across the lower ends 20L of the pair of stringers 20. The central finishing material 70 is attached to the pair of stringers 20 via base materials 74. Outer finishing materials 72 are positioned on both sides of the central finishing material 70 in the width direction (direction of arrow Y) of the stringer staircase 10.

The outer finishing material 72 is positioned diagonally across the stringer 20 and the handrail support 40. This outer finishing material 72 is attached to the stringer 20 and the handrail support 40 via a base material 74.

The central finishing material 70 and outer finishing material 72 can be provided as needed and can be omitted as appropriate.

(effect)
Next, the operation of this embodiment will be described.

As shown in Figure 3, in the stringer staircase 10 of this embodiment, multiple treads 30 and risers 32 are arranged in a stepped pattern on a pair of stringers 20. As shown in Figure 2, each tread 30 extends out on both sides from the pair of stringers 20. Similarly, each riser 32 (see Figure 3) extends out on both sides from the pair of stringers 20.

The handrail support 40 is provided along the tip 30T of the tread 30 that protrudes from the stringer 20 and the tip of the riser 32 (not shown). The handrail support 40 extends downward from the tip 30T of the multiple treads 30 and the tip of the riser 32, with the lower end 40L positioned above the lower end 20L of the stringer 20.

As a result, in this embodiment, the thickness G of the stringer staircase 10 is thinner in side view than when the lower end 40L of the handrail support 40 is positioned at the same height as the lower end 20L of the stringer 20, as shown in Figure 1.

In addition, the lower end 20L of the stringer 20 is positioned further back (towards the center of the stringer staircase 10) than the lower end 40L of the handrail support 40. This makes the lower end 20L of the stringer 20 less visible and less noticeable when viewed from the side. This makes the stringer staircase 10 appear thinner when viewed from the side, thereby enhancing the design of the stringer staircase 10.

On the other hand, the lower end 20L of the stringer 20 is positioned lower than the lower end 40L of the handrail support 40. In other words, the vertical width (beam depth) of the stringer 20 is wider than the vertical width (beam depth) of the handrail support 40. As a result, in this embodiment, vibration of the stringer staircase 10 is suppressed compared to when the vertical width of the stringer 20 is narrowed and the lower end 20L of the stringer 20 is positioned at the same height as the lower end 40L of the handrail support 40.

In this way, this embodiment suppresses vibration of the stringer staircase 10 while making the stringer staircase 10 appear thinner when viewed from the side.

Also, as shown in Figure 3, a plurality of risers 32 are provided on the pair of stringers 20. The risers 32 extend outward from both sides of the pair of stringers 20 and connect adjacent treads 30 vertically. As a result, the plurality of treads 30 and risers 32 form a stepped cross section.

By forming a stepped cross section using multiple treads 30 and risers 32 in this way, the bending rigidity of the multiple treads 30 and risers 32 that extend outward from the pair of stringers 20 can be increased. Therefore, the amount of extension of the multiple treads 30 and risers 32 that extend outward from the pair of stringers 20 can be increased. If there are concerns about the treads 30 and risers 32 bending, the thickness of the treads 30 and risers 32 may be increased as needed.

In other words, the pair of stringers 20 can be positioned closer to the center of the longitudinal direction (direction of arrow Y) of the multiple treads 30 and risers 32. As a result, as shown in Figure 1, the lower ends 20L of the pair of stringers 20 become even less visible in side view, making the stringer staircase 10 appear thinner.

Furthermore, the design of the stringer staircase 10 can be further enhanced by covering the underside of the stringer staircase 10 with a central finishing material 70 and a pair of outer finishing materials 72.

As shown in Figure 4, the handrail support 40 has a storage section 40V that has a U-shaped cross section and is open at the top. By storing the lower end 60L of the glass handrail 60 in this storage section 40V, the glass handrail 60 is supported by the handrail support 40.

By accommodating the lower end 60L of the glass handrail 60 in the accommodating portion 40V of the handrail support portion 40 in this way, the panel-shaped handrail can be easily attached to the stringer staircase 10.

In addition, by attaching a transparent glass handrail 60 to the stringer staircase 10, the design of the stringer staircase 10 can be further enhanced.

(Modification)
Next, a modification of the above embodiment will be described.

In the above embodiment, the panel-like handrail is a glass handrail 60. However, the panel-like handrail is not limited to a glass handrail 60 and may be, for example, a panel-like handrail made of resin, wood, or metal.

In addition, in the above embodiment, the multiple treads 30 and risers 32 are integrated to form a stepped cross section. However, the multiple treads 30 and risers 32 may not be integrated, but may be separate. Furthermore, the risers 32 may be provided as needed and may be omitted as appropriate.

Furthermore, in the above embodiment, the stringer staircase 10 is provided with a pair of stringers 20. However, the stringer staircase 10 is not limited to a pair (two) of stringers 20; it may be provided with one stringer 20 or three or more stringers 20. In other words, the stringer staircase 10 can be provided with at least one stringer 20.

The above describes one embodiment of the present invention, but the present invention is not limited to this embodiment. One embodiment and various modified versions may be used in appropriate combination, and the present invention can of course be implemented in various forms without departing from the spirit of the present invention.

10 Girder staircase 20 Stringer 20L Lower end (lower end of stringer)
30 Tread 30T Tip (tip of tread)
32 Riser 40 Handrail receiving portion 40L Lower end portion 40V Storage portion 60 Glass handrail 60L Lower end portion

Claims (3)

Stringers and
a plurality of treads provided in a stepped manner on the stringer and extending from both sides of the stringer;
a handrail support provided continuously along the tip ends of the plurality of treads extending from the stringer, extending downward from the tip ends, and having a lower end located above the lower end of the stringer;
Stringer staircase with. a plurality of risers provided on the stringers, extending from both sides of the stringers, connecting adjacent treads in the vertical direction and forming a stepped cross section together with the treads;
2. The stringer staircase of claim 1. A panel-shaped handrail is provided which is supported by the handrail receiving portion,
The handrail receiving portion has a U-shaped cross section that is open at the top and has a receiving portion that receives the lower end of the panel-shaped handrail.
Stringer staircase according to claim 1 or claim 2.