JPH0352350Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to treads for steel-frame stairs that are often used outdoors, and belongs to the industrial field that deals with steel-frame stairs.

(Prior art) Conventionally used treads are shown in Figures 7 and 8.
As shown in the figure, vertical ribs 21 are provided on the lower surface of the steel plate 20, both edges 20a and 20b of the steel plate are folded vertically, and one side is welded to the central support 22.
The other side is welded to the strip plate 23.

(Problems to be solved through innovation) According to the conventional structure, the treads are fixed by welding, so in the case of mass production in a factory, transportation and installation are large-scale, and handling and other problems are required. In the case of on-site welding, there are many restrictions.
Not only do welding engineers have to go to the site, but welding efficiency is poor, strength reliability is reduced, and there are difficulties with the construction period (e.g., efficient use of engineers, work delays due to rain, etc.) Ta.

Additionally, metal treads have the problem of generating noise when used.

(Means for Solving the Problems) This invention solves the above-mentioned problems of the conventional art by making it possible to connect the tread with bolts and the like, and by making the tread a reinforced concrete plate.

That is, in this invention, a vertical rib is provided on the lower surface of the bottom plate, a bolt connecting piece with the platen is provided on one side of the bottom plate, a bolt connecting part with the fixing member on the other side is provided on the vertical rib, and A reinforced concrete plate was integrally formed on the bottom plate to form a steel stair tread.

In the above, the concrete plate is, for example, lightweight concrete (for example, containing lightweight aggregate such as whitebait or low-foam concrete), fiber concrete, or lightweight concrete containing fibers, but the reinforcing bars fixed to the bottom plate are not inserted into the concrete. By burying it, it becomes a high-strength tread.

In addition, the fixing member is a fixing plate of a cylindrical support in the case of a cylindrical spiral staircase, and a plate in the case of a non-spiral staircase. The tread has a planar fan shape (in the case of a spiral staircase) or a planar rectangular shape (in the case of an ordinary staircase), but in either case, a bottom plate is provided at the lower center in the plan view over the entire length.

The vertical ribs are vertically wide on the fixed member side and narrow on the plate side, so that a moment of inertia corresponding to the load can be obtained.

In the above, the strip and the bottom plate are attached with bolts, and the fixing member and the vertical rib are attached with bolts, but both ends of the vertical rib may be fixed with bolts to the fixing member and the strip.

(Function of the invention) That is, according to this invention, the tread and the plate, etc. are fixed with bolts, so it is possible to assemble on-site, and the column, the outer cover, and the tread can be transported separately, and welding or other means are required. It can be easily assembled without using it.

In addition, the treadle is lightweight, strong, and noiseless.

(Example) Next, an example of this invention will be described with reference to the drawings.

A vertical rib 2 cut to an appropriate size is fixed to the lower surface of a bottom plate 1 made of a steel plate, and a connecting piece 3 is vertically connected to one side of the bottom plate 1, and a rising piece 4 is connected to the other side.
Reinforcing bars 5 and 5a are laid vertically and horizontally on the bottom plate 1, the ends of the vertical reinforcing bars 5 are fixed to the rising piece 4 and the connecting piece 3, and the horizontal reinforcing bars 5a are fixed to the bottom plate 1. A fiber concrete plate 6 is placed above the bottom plate 1.
and is provided integrally with the reinforcing bars 5, 5a, and the tread plate 7
It consists of One side of the vertical rib 2 can be fixed to a fixing plate 10 of the cylindrical support 9 with a bolt 11 via the joint plates 8 and 8a.
Further, the connecting piece 3 provided on the bottom plate 1 can be fixed to a strip plate 13 via bolts 12. That is, bolt holes are provided in the connecting piece 3 and the plate 13.

The tread 7 of this embodiment has a planar fan shape and is a tread for a spiral staircase. To construct a spiral staircase using the tread 7, a fixed plate 10 of the cylindrical support 9;
One side of the vertical rib 2 is brought into contact with the joint plates 8, 8a on both sides of the joint, and the fixing plate 10, the vertical rib 2, and the joint plates 8, 8a are integrally tightened and fixed with bolts 11. , the connecting piece 3 and the plate 13
are integrally tightened and fixed with bolts 12.
In this case, the guide rods 14, 14, which are arranged in parallel on the outside of the footboard 7, are clamped between the mounting strip 15 and the plate 13, and are tightened and fixed with the bolts 12. In the figure, 16 is the handrail support rod, 17 is the handrail rod,
18 is a landing, and 19 is a foundation of the cylindrical support 9.
As shown in FIG. 5, the treads 7 in the embodiment have a slight overlap between the top and bottom, and are also fixed to the guide rod 14 via the mounting strip 15, so that a solid staircase is constructed. ing.

In the embodiment described above, a fiber concrete plate 6 was provided, but a lightweight concrete plate may be used instead. It can also be a lightweight concrete plate with fibers.

(Effects of the invention) According to this invention, the treads are fastened and fixed to the straddle board etc. with bolts, so there is an effect that stairs can be easily constructed by on-site assembly regardless of the dimensions. In addition, since the tread can be mass-produced in a factory, quality control is easy, and since it is installed by tightening and fixing with bolts, it has high strength and reliability, and does not require special technology unlike welding. It has various effects.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted front view of a spiral staircase using the treads of this invention, Fig. 2 is a partially enlarged front view showing the fixed state of the treads, and Fig. 3 is a partially enlarged plan view. Fig. 4 is a partially enlarged plan view showing the fixed state of the guide rod, Fig. 5 is a partially enlarged side view of Fig. 1, Fig. 6 is a partially enlarged plan view of the landing, and Fig. 7 is a partially enlarged plan view of the landing. FIG. 8, which is a front view of the conventional stepboard in its installed state, is also an enlarged partial cross-sectional view. 1... Bottom plate, 2... Vertical rib, 3... Connecting piece, 6
...Fiber concrete board, 7...Treadboard, 9
... Cylindrical support, 10 ... Fixed plate, 13 ... Saddle board.

Claims (1)

[Claims for Utility Model Registration] 1. A vertical rib is provided on the lower surface of the bottom plate, a bolt connecting piece with the platen is provided on one side of the bottom plate, and a bolt connecting piece with the fixing member on the other side is provided on the vertical rib. and place a reinforced concrete plate on the bottom plate.
A steel stair tread integrally formed with the bottom plate. 2. A tread for steel-framed stairs as set forth in claim 1 of the utility model registration claim, in which the tread has a planar fan shape. 3. The steel stair tread according to claim 1, wherein the vertical rib is higher on the fixed member side and lower on the side of the plate, and is provided in the center of the bottom plate. 4. The steel stair tread according to claim 1, wherein the concrete plate is a fiber concrete plate or a lightweight concrete plate containing fibers. 5. The steel stair tread according to claim 1 of the utility model registration claim, in which the fixing member is a mounting plate for the central column or a ribbed plate.