JPH075137Y2 - Precast concrete board for stairs - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a precast concrete board for stairs.

[0002]

2. Description of the Related Art In a conventional precast concrete board for stairs, a stairway portion is manufactured in advance, and then, at a landing portion, a frame is constructed by welding a reinforcing bar on site and concrete is placed there. .

[0003]

However, in the conventional precast concrete plate for stairs as described above, only the stairs are manufactured in advance, and the stairway landing is separately attached later at the site. It was For this reason, it was necessary to pour concrete after assembling the complicated formwork of the step board on site. Further, in the conventional precast concrete board for stairs, it has to be welded to the reinforcing bar in the landing, and a special skill worker such as a welder is required on site.

The present invention is a conventional precast concrete for stairs.
It was made in view of the problems of cleats.
The purpose is a reinforcing bar for building the landing part on site.
There is no need to re-bar or concrete placement,
It is an object of the present invention to provide a precast concrete plate for stairs , which has a structure in which a part and a landing part are integrated and can be used for various stairs.

[0005]

In order to achieve the above object, the present invention connects a top muscle and a bottom muscle, which are three-dimensionally parallel to a stairway portion and a landing connected thereto, in a triangular shape. It is characterized in that truss muscles composed of lattice muscles are embedded so that upper surfaces of the top muscles and the lattice muscles are partially exposed.

With the precast concrete board for stairs according to the present invention, a precast concrete board with a landing can be manufactured in a factory. Therefore, the complicated form of the step plate can be omitted. In addition, since the landing is integrally manufactured with precast concrete boards, it is not necessary to carry out work such as welding on the site by complicated special skill workers. So
Then, the structure where the upper surface of a part of the rebar of the landing part is exposed
As a result, precast concrete board with landing
When installing the precast concrete board
For forming a floor over the landing part that forms part
It is only necessary to place a concrete layer.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a precast concrete plate for stairs according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an example of a stairway part of a building used for the precast concrete plate for stairs of the present invention. . In the figure,
The precast concrete board 10 for stairs has a stair part 11
The top muscles 14 are arranged in parallel in three dimensions to the landing 12 connected to the niizumasuji muscles 13 as well as arranged.
Lattice muscle 16 connecting the bottom muscle 15 with the triangle
With the truss line consisting of and, in the landing 12,
The top muscles 14 and the lattice muscles 16 are buried so that the upper surfaces thereof are partially exposed.

Next, the construction method using the precast concrete board 10 for stairs constructed as described above will be explained. First, as shown in FIG. 2, the staircase precast concrete plate 10 is laid between the adjacent beams 20 and 20 for positioning. Next, a concrete layer is integrally cast by cast-in-place so that the heights of the landing 12 and the upper surface of the floor 17 are the same. When the floor 17 is constructed in this way, the landing 1 of the precast concrete board 10 for stairs
2 The truss bar 14 exposed on the upper surface is buried in cast-in-place concrete. Most of the precast concrete boards for stairs used here are manufactured at the factory, and since only part of the landing is cast on site, the stairway construction accuracy can be significantly improved.

Another embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a vertical sectional view of a precast concrete board for stairs according to another embodiment of the present invention, and FIG. 4 is a perspective view showing an example of a stairway part of a building used for the precast concrete board for stairs of the present invention. is there. In FIG. 3, the precast concrete plate 10a for stairs includes a lattice line 16 connecting a top line 14 and a bottom line 15 which are three-dimensionally arranged in parallel to the stair part 11 and the landing line 12 connected to the stair part 11 and a land line 16. In the landing 12, the truss streaks consisting of the above are arranged so that the upper surfaces of the top streaks 14 and the lattice streaks 16 are partially exposed.

Next, the construction method using the precast concrete board 10a for stairs constructed as described above will be explained. First, as shown in FIG. 4, the precast concrete plate 10a for stairs is positioned between the adjacent beams 20 and 20 for positioning. Next, the landing 12 and each floor 1
A concrete layer is cast by casting in one place so that the height of 7 and the height of the top surface are the same. When the floor 17 is constructed in this manner, part of the truss streaks exposed on the upper surface of the landing 12 of the precast concrete board 10a for stairs is buried in cast-in-place concrete. The precast concrete board 10a for stairs used here is mostly manufactured in a factory like the precast concrete board 10 for stairs, and since only a part of the landing is cast on site, the accuracy of the staircase construction is improved. It can be significantly improved.

In the above embodiments, the combination of the internal muscle and the truss muscle and the combination of the truss muscle and the truss muscle have been described. However, only the top muscle 14 and the bottom muscle 15 which are three-dimensionally arranged parallel to each other only in the stair portion 11 are described. It may be a precast concrete board for stairs, in which truss reinforcements composed of lattice reinforcements 16 connecting in a triangular shape are buried and the landing part connected to the truss reinforcements is partially exposed so that the upper surface of the reinforcement is exposed.

[0012]

[Effects of the Invention] As described above, in the precast concrete plate for stairs of the present invention, the stairs use the inuzuma streak, and the top streak and the bottom streak are three-dimensionally arranged parallel to each other at the landing connected thereto. The truss muscles, which consist of latticed muscles that connect the muscles in a triangular shape, were buried so that the top muscles and part of the upper surface of the latticed muscles were exposed, so concrete was cast on site using a complex formwork. You don't have to. Therefore, the construction work of the stairs can be remarkably streamlined. Further, since it is not necessary to join the joint by a special skill worker such as welding at the site, the work period can be shortened. Furthermore, when trusses are used for the stairs, the strength of the stairs can be increased.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a precast concrete plate for stairs according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example in which a staircase portion of a building is constructed by using the precast concrete board for stairs of the present invention.

FIG. 3 is a vertical cross-sectional view of a precast concrete board for stairs according to another embodiment of the present invention.

FIG. 4 is a perspective view showing an example in which a staircase portion of a building is constructed by using another precast concrete board for stairs of the present invention.

[Explanation of symbols]

 10 Precast concrete board for stairs 11 Stairs 12 Landing 13 Inazuma muscle 14 Top muscle 15 Bottom muscle 16 Lattice muscle 17 Floor 20 Beam

Claims (3)

[Scope of utility model registration request] 1. A truss reinforcer comprising an indama streak for a staircase part and a lattice reciprocal line connecting three-dimensionally parallel top and bottom reciprocal lines in a landing connected thereto. Is a precast concrete plate for stairs, in which the top reinforcement and the lattice reinforcement are partially exposed so that the upper surfaces are exposed. 2. A stairway portion and a landing portion connected to the landing portion are embedded with truss muscles composed of three-dimensionally parallelly arranged top and bottom muscles that connect in a triangular shape to latticed muscles. A precast concrete board for stairs, characterized in that it is embedded so that the upper surfaces of the top muscles and lattice muscles are exposed. 3. A truss reinforcement consisting of a lattice reinforcement connecting a top reinforcement and a bottom reinforcement, which are three-dimensionally arranged parallel to each other, is embedded in the stairs, and a reinforcing bar is connected to a landing portion connected to the truss reinforcement. A precast concrete board for stairs, which is buried so that its upper surface is partially exposed.