JPH0334410Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a floor slab using precast concrete plates.

As shown in FIG. 1, a conventional floor slab of this type uses a precast concrete plate 3 that incorporates reinforcing bars 1 and the lower part of a reinforcing bar truss 2, and this precast concrete plate 3 is not shown. Reinforcement trusses 2 lined up on beams and protruding upwards
Slab upper end reinforcements 4 are arranged on top, and the reinforcing bar trusses 2 of adjacent precast concrete plates 3 are connected with connecting bars 5, and then concrete is poured on top of these precast concrete plates 3. This was obtained by forming a post-cast concrete layer 6 and integrating the precast concrete plate 3 and the post-cast concrete layer 6 with a reinforcing bar truss 2.

However, in such conventional floor slabs, when concrete is poured into the post-cast concrete layer 6, the concrete often does not wrap around the connecting bars 5 sufficiently, and for this reason, the precast concrete plate 3 is placed under the connecting bars 5. , a void 8 leading to the gap 7 between the precast concrete plates 3 is formed, and the connecting bars 5 are exposed at the butt part of the precast concrete plates 3, rusting occurs, the strength of the reinforcing bars themselves decreases, and at the same time the bond between the reinforcing bars and the concrete deteriorates. There were disadvantages in that the adhesion force was significantly reduced and the mechanical strength of the slab was reduced.

The purpose of the present invention is to create a floor slab using precast concrete plates that can prevent the connection bars 5 from being exposed to the outside air and rust at the butt portions of the precast concrete plates, and prevent a decrease in the mechanical strength of the slab. is to provide.

The present invention provides a floor slab using precast concrete plates in which a plurality of precast concrete plates are lined up with their end faces butted against each other, and a post-cast concrete layer is placed on top of the precast concrete plates. Each precast concrete board is
The lower part of the reinforcing steel truss is buried in the upper part of the precast concrete plate, and a tapered surface is formed at the upper edge of the periphery of the precast concrete plate,
This tapered surface forms a V-shaped groove in the upper part of the abutting portion of the adjacent precast concrete plates, and the post-cast concrete layer is poured with concrete also in the V-shaped groove, and A floor slab using a precast concrete board, characterized in that the reinforcing bar trusses of the precast concrete board are connected by connecting bars.

Hereinafter, an embodiment of a floor slab using a precast concrete plate according to the present invention will be described in detail with reference to FIG. 2. As shown in the figure, the precast concrete plate 3 has a structure in which the reinforcing bars 1 are built in, and the lower part of the reinforcing bar truss 2 is embedded in the upper part. Moreover, this precast concrete plate 3 has a tapered surface 3A at the upper edge of its periphery.
is formed. Such precast concrete plates 3 are arranged on a beam (not shown) with their end faces butted against each other. Since a tapered surface 3A is formed on the upper edge of each precast concrete plate 3, a V-shaped groove 9 is formed in the upper part of the butt part of the precast concrete plates 3 by both tapered surfaces 3A. It is formed.
Slab top reinforcements 4 are arranged on top of each reinforcing bar truss 2 that protrudes upward. Furthermore, the reinforcing bar trusses 2 of adjacent precast concrete plates 3 are connected by connecting bars 5. The connecting bars 5 and the reinforcing bar truss 2 are connected by wire binding. A post-cast concrete layer 6 is placed on the precast concrete plate 3 spread in this manner so as to also fill the V-shaped groove 9.

Such a floor club is made of post-cast concrete layer 6
Even if a void 8 is created due to a failure of the concrete to wrap under the connecting bar 5 during pouring, this part becomes a V-shaped groove 9 as described above, and the post-cast concrete layer 6 fills this V-shaped groove. Since the wall thickness is increased by an amount 9 protruding toward the precast concrete plate 3, the space 8 is no longer exposed to the outside air, preventing rust from forming, and providing sufficient mechanical strength. .

As explained above, in the floor slab using precast concrete plates according to the present invention, a V-shaped groove is provided in the upper part of the butt part of the precast concrete plates, and the post-cast concrete layer is also placed in this V-shaped groove. At the same time, the reinforcement truss of the adjacent precast concrete plate was connected with connecting bars, so when pouring the post-cast concrete layer, there was a void under the connecting bars due to poor wrapping under the connecting bars. Even if this is done, this part is inside the V-shaped groove mentioned above, and the post-cast concrete layer protrudes toward the precast concrete plate by the amount of this V-shaped groove, making it a thick structure. Since the reinforcing bars are not exposed to the outside air, rust is prevented, and sufficient mechanical strength can be obtained at the abutting portions of the precast concrete plates.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a conventional floor slab, and FIG. 2 is a sectional view of a main part of an embodiment of a floor slab according to the present invention. 1...Reinforcement bar, 2...Reinforcement truss, 3...Precast concrete plate, 3A...Tapered surface, 4
...Slab top reinforcement, 5...Connection reinforcement, 6...Post-cast concrete layer, 7...Gap, 8...Vacancy, 9...
V-shaped groove.

Claims (1)

[Scope of utility model registration request] In a floor slab using precast concrete plates, which is formed by arranging a plurality of precast concrete plates with their end faces butted against each other, and placing a post-cast concrete layer on top of the plates,
Each precast concrete plate has a lower part of the reinforcing steel truss buried in the upper part of the precast concrete plate, and a tapered surface is formed at the upper edge of the periphery of the precast concrete plate, and this tapered surface allows the adjacent precast concrete plate to A V-shaped groove is formed in the upper part of the butt part of the cast concrete plates, and the post-cast concrete layer is poured by filling the V-shaped groove with concrete, and the reinforcing bar truss of the adjacent precast concrete plate is placed. is a floor slab using precast concrete plates that are connected by connecting bars.