JPH02296948A - Construction method of reinforced concrete construction slab - Google Patents

Abstract

PURPOSE:To reduce the weight and to improve the workability by disposing light buried material between ribs of a PC concrete half slab where ribs are projected side by side on the upper surface thereof, and depositing concrete after arranging upper end reinforcing bars thereon. CONSTITUTION:A pre-cast concrete half slab 1 is manufactured in such a manner that a lower end reinforcing bar is buried and ribs 1a are arranged side by side on the upper surface thereof. Light buried materials 8 such as rock wool or the like are disposed at spaces in the longitudinal direction between the ribs 1a. When it is necessary that the half slabs 1 are connected in the longitudinal direction, a joint bolt or PC steel material are inserted in insertion holes 1b provided in the ribs 1a to join them. After an upper end reinforcing bar is arranged thereon, concrete is placed to construct a slab. Thus, it is possible to construct a slab which is light and has high rigidity and workability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for constructing a reinforced concrete slab, which constructs a slab having a composite structure from a precast half slab and cast-in-place concrete.

(Problem to be solved by the invention) By making the slab a composite structure from precast concrete slabs and cast-in-place concrete, it is possible to save labor and shorten the construction period. Slab structures have been implemented in the past that have hollow sections and omit small beams, while at the same time increasing the thickness of the slabs to increase rigidity, improve work efficiency, and improve the sound insulation performance of the floor.

Conventionally, the precast floor slab of this composite slab has been made thinner for ease of transportation and lifting, and has a structure with protruding truss bars on the top side for integration with the poured concrete, and a structure in which the precast slab itself is There is a structure with ribs protruding in two directions to improve rigidity, but the former has low rigidity and requires shoring from the time of pouring concrete until it develops strength.
The latter, on the other hand, increases the weight and makes workability worse.
There is a problem.

This invention was made by focusing on these problems of conventional precast plates, and aims to propose a method of constructing a slab structure that overcomes both of the above-mentioned weaknesses.

(Means for Solving the Problems) In the present invention, the width of the half slab, which is a precast floor slab, is set to a size such that one slab or a plurality of slabs are connected to have l span length, and riffs are arranged in one direction on the upper surface of the half slab. A half slab is manufactured by protruding from the ribs, and with the buried material installed at intervals in the length direction between the ribs, the upper reinforcement is placed, concrete is poured, and the buried material is placed in two directions. By forming ribs on the half-slabs, the weight of each half-slab is reduced while increasing the rigidity of the slab. At the same time, workability and economic efficiency are improved by reducing support man-hours.

(Example) The present invention will be explained below based on the drawings showing one embodiment.

This invention consists of a half slab 1 made of precast concrete in which a lower end reinforcement 2 is buried and a rib LA protrudes in one direction.
This is a method of constructing a slab S made of reinforced concrete or steel-framed reinforced concrete.

The width of the half slab 1 is such that one plate or a plurality of plates are connected to form one span length as in the embodiment shown in FIG. They are connected by bolts 5 and the like passed through the insertion holes 1b and lb drilled in la and la, respectively.

In the slab S, buried materials 8 such as rock wool are installed between the ribs la of the half slab 1 at intervals in the length direction of the ribs 1a as shown in the figure, and further on the ribs 1a as shown in FIG. It is constructed by arranging upper end reinforcements 4 and pouring concrete 3.

In the rib 1a, as shown in FIG. 3, a loop bar 7 through which the upper end bar 4 is inserted is buried vertically with its upper part exposed from the upper end of the rib 1a, and an anchor bar is provided in the direction perpendicular to the rib 1a. 9 are protruded in parallel, and the half slab 1 is integrated with the cast-in-place concrete 3.

■If the span is relatively large, as shown in Figure 2, insert the PC steel material 6 into the insertion hole 1b drilled through the entire rib la.
By inserting the half slab 1. into the half slab 1 and introducing prestress into the half slab 1. The unity between l is supplemented.

In this case, the connecting bolt 5 becomes unnecessary.

The PCJgl material 6 is also arranged as necessary in the length direction of the four ribs 1a, which is the long side direction of the slab S, as shown in FIG.

The upper reinforcement 4 is arranged on the half slabs 1, 1 connected by the bolts 5 or the PC steel material 6, and the concrete 3
By casting, a hollow slab S is formed in which ribs are formed in two directions from the ribs 1a of the half slab I and the poured concrete 3 with the buried material 8 in between.

The half slab 1 that makes up this hollow slab S can also be manufactured on-site as a single plate with a width of 1 span, as shown in Figure 4. Bolts 5 are not required, making it more economical and labor-saving.

(Effects of the Invention) This invention is as described above, and a rib is provided protruding in one direction on a half slab of a precast floor slab, and a rib is formed by pouring concrete in a direction perpendicular to the rib, and two ribs are formed in a direction perpendicular to the rib. Because it constructs a slab with a structure in which ribs are arranged in one direction, it has higher rigidity than a slab with a conventional structure.Also, since the half slab has ribs in only one direction, the weight of each half slab is reduced, and Due to the rigidity of the half slab itself, support man-hours are reduced, and workability and economic efficiency are improved at the same time.

[Brief explanation of drawings]

Figure 1 is a plan view showing how the half slabs are connected;
The figure is a perspective view showing a part of it, Figure 3 is a sectional view showing the concrete placement situation, Figure 4 is a perspective view showing a single half slab, Figures 5 and 6 are FIG. 4 is a cross-sectional view taken along line X-X and Y-Y in FIG. 4, respectively, showing the state of concrete placement. S...Slab, 1...Half slough,
1a...Rib, ■b...Through hole, 2.
...Bottom reinforcement, 3...Concrete, 4.
...Top end reinforcement, 5...Bolt, 6...
...PCTM material, 7...Loop muscle, 8...
... Buried material, 9... Anchor reinforcement.

Claims (1)

[Claims] (1) A precast concrete half made of a single plate or multiple plates connected to form one span length, with ribs protruding in parallel in one direction on the top surface, and bottom reinforcement embedded. Embedded materials are installed between the ribs of the slab at intervals in the length direction, and upper reinforcement is placed on this half slab and concrete is poured to form ribs in two directions around the embedded materials. Reinforced concrete slab construction method to construct a slab with a reinforced concrete structure.