JPH0524764U - Precast concrete board for stairs - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a precast concrete board for stairs that can be used for various stairs without the work of placing landings on site. [Structure] Staircase 11 and landing 12 connected to it
In order to expose a part of upper surface of the top muscle 14 and the lattice 16 muscle, a truss muscle composed of a top muscle 13 and a lattice muscle 15 that connects the bottom muscle 14 in a three-dimensional manner in a triangular shape Since it is buried, it is easy to build the stairs.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a precast concrete plate for stairs.

[0002]

[Prior Art]

 In the conventional precast concrete board for stairs, the stairway part was manufactured in advance, and then the landing part was constructed by welding the reinforcing bars on site and the concrete was placed there.

[0003]

[Problems to be solved by the device]

 However, in the conventional precast concrete board for stairs as described above, only the stairs are manufactured in advance, and the landing of the stairs was separately attached later at the site. For this reason, it was necessary to install the concrete formwork of the step board on site before pouring the concrete. Moreover, in the case of the conventional precast concrete board for stairs, it was necessary to weld it to the reinforcing bar in the landing area, and special skill workers such as welders were required on site.

In view of the problems of the conventional precast concrete board for stairs, an object of the present invention is to provide a precast concrete board for stairs that can be used for various stairs without the work of placing a landing on site. To provide.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a truss muscle consisting of a stairway portion and a lattice muscle connecting a top muscle and a bottom muscle, which are three-dimensionally arranged parallel to each other, to a landing connected to the stairway portion, and a lattice muscle. It is characterized in that it was embedded so that the upper surfaces of the top muscles and the lattice muscles were partially exposed.

[0006]

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, it is possible to omit the complicated formwork of the step plate. Also, since the landing is integrally manufactured from precast concrete boards, it is not necessary to carry out on-site work such as welding by complicated special skill workers.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a precast concrete board 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 board for stairs of the present invention. .. In the figure, a precast concrete plate 10 for stairs has a stair part 11 with a stirrup bar 13, and between a top streak 14 and a bottom streak 15 which are vertically arranged parallel to each other on a landing 12 connected to the stair part 11. Truss muscles composed of lattice muscles 16 that connect to each other in a triangular shape are provided, and in the landing 12, the top muscles 14 and the lattice muscles 16 are buried so that part of their upper surfaces are exposed.

Next, a construction method using the precast concrete board 10 for stairs configured as described above will be described. First, as shown in FIG. 2, the staircase precast concrete plate 10 is laid between the adjacent beams 20 and 20 for positioning. Next, the concrete layers are integrally cast by cast-in-place so that the height of the landing 12 and the upper surface of the floor 17 coincide with each other. When the floor 17 is constructed in this manner, the truss bars 14 exposed on the upper surface of the landing 12 of the precast concrete plate for stairs 10 are buried with cast 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 longitudinal sectional view of a precast concrete plate for stairs according to another embodiment of the present invention, and FIG. 4 is a perspective view showing an example of a staircase part of a building used for the precast concrete plate for stairs of the present invention. is there. In FIG. 3, the precast concrete board 10a for stairs is a lattice reinforcement 16 that connects a top reinforcement 14 and a bottom reinforcement 15 that are three-dimensionally arranged in parallel to the staircase 11 and the landing 12 connected to it. In the landing 12, the truss muscles consisting of and are embedded so that the upper surfaces of the top muscles 14 and the lattice muscles 16 are partially exposed.

Next, a construction method using the precast concrete board 10a for stairs configured as described above will be described. First, as shown in FIG. 4, the precast concrete plate for a staircase 10a is positioned between the adjacent beams 20 and 20 for positioning. Next, concrete layers are integrally cast by cast-in-place so that the heights of the landing 12 and the upper surfaces of the floors 17 coincide with each other. When the floor 17 is constructed in this manner, a part of the truss streaks exposed on the upper surface of the landing 12 of the stair precast concrete plate 10a is buried in cast-in-place concrete. The precast concrete board 10a for stairs used here is mostly manufactured at the factory like the precast concrete board 10 for stairs, and only part of the landing is cast on site, so how to build the stairs. The accuracy 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, but 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 consisting of lattice reinforcements 16 connecting between them in a triangular shape are embedded and the landing portion connected to this is embedded so that a part of the upper surface of the reinforcement is exposed. ..

[0012]

[Effect of the device]

 As described above, in the precast concrete plate for stairs of the present invention, the stairs are provided with the Inazuma streaks, and the landing strips connected to the stairs are three-dimensionally arranged in parallel with each other between the top and bottom streaks. The tras bars, which consist of the lattice muscles connected to the shape, were buried so that the top muscles and part of the upper surface of the lattice muscles were exposed.Therefore, it was necessary to place concrete using a complex formwork in the field. Absent. Therefore, the construction work on the floor can be remarkably streamlined. In addition, it is possible to shorten the construction period because there is no need to join the joint by a special skill worker such as welding on site. 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 board 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 muscle comprising a streak muscle and a lattice muscle connecting a top muscle and a bottom muscle, which are three-dimensionally arranged parallel to each other, to a landing connected to the stair muscle. Is a precast concrete plate for stairs, in which the top reinforcement and the lattice reinforcement are partially exposed to expose their upper surfaces. 2. A landing part is provided in which a truss line made up of a stair part and a lattice line connecting a top line and a bottom line, which are three-dimensionally parallel to each other, is connected to the land line connected to the step line and a triangle line. The precast concrete board for stairs, which is buried so that the upper surfaces of the top muscles and the lattice muscles are partially 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 the landing portion connected to the truss reinforcement. A precast concrete board for stairs, which is buried so that its upper surface is partially exposed.