JPS58106042A - Hollow slab - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforced concrete hollow slab, a hollow slab having improved shear reinforcement.

The hollow slab is considered to have a structure in which Xg beams are continuously gathered in the direction of the hole, and the main reinforcing bars are placed in the direction of the holes, and shear reinforcement is arranged between the upper and lower reinforcing bars to act as a beam, and the main reinforcing bars are placed orthogonally to the main reinforcing bars. The design is such that secondary reinforcing bars are arranged in the direction of the slab and integrated as a slab.

However, in the conventional structure, as shown in FIG. 1, the upper and lower ends of the shear reinforcing bars are attached to the main reinforcing bars in a winding manner, which requires a considerable amount of time and effort.

By the way, general reinforced concrete slabs have low shear stress, so there is no need for shear reinforcement. In addition, the shear stress due to long-term stress in reinforced concrete beams is not very large except for large spans, so minimal reinforcement is sufficient, and shear reinforcement is used to increase the ultimate strength during earthquakes.

As a result of taking the above matters into consideration, this invention aims to save labor at the construction site by prefabricating shear reinforcing bars, which do not necessarily need to be connected to the main reinforcing bars.

The details will be explained below with reference to illustrated embodiments.

Hollow pipes 1 are arranged at specified intervals at the slab construction position, and main reinforcing bars 2 are arranged in the upper and lower parts between the hollow pipes 1.1 in a direction parallel to the hollow pipes 1. Secondary reinforcing bars 5 are arranged in the orthogonal direction, and prefabricated lattice reinforcement bars 4 are arranged vertically between the hollow pipes 1 and 1 as shear reinforcing bars in parallel with the hollow pipes 1. It is set up in a circle.

This lattice-shaped reinforcing bar 4 can be a welded wire mesh, a mesh reinforced expanded band section, or a lattice-like structure in which upper and lower horizontal reinforcing bars are welded together with vertical reinforcing bars.

Alternatively, the main reinforcing bars 2 may be deposited in advance on the upper and lower ends of the lattice-like reinforcing bars 4 to form a truss shape.

The lattice-shaped reinforcing bars 4 can be placed away from the main reinforcing bars 2 by using appropriate pillows or by suspending them from wires.

Further, it can be made equal to the height between the upper and lower main reinforcing bars 2, 2, and can also serve as a space.

This invention has the above configuration, and since the shear reinforcing bars are in a prefabricated lattice shape, they can be arranged in parallel with the hollow tubes and arranged between the hollow tubes, making site work extremely easy, and moreover, The usefulness of the system can be further improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the conventional example, Fig. 2 is a sectional view of the present invention,
Figure 5 is a front view of the shear reinforcement, Figures 4, 5, 6 and 7 are side views and front views of other embodiments of the shear reinforcement. It is. 1. Hollow pipe, 2. Main reinforcing bar, 5. Secondary reinforcing bar, 4. Lattice reinforcement, 5. Concrete. Kurimoto Iron Works Co., Ltd. Patent Applicant Kazu 1) Tsutomu Agent Satoshi Hisakado Figure 1 Figure 4 Figure 2 1 Figure 51N l□

Claims (1)

[Claims] Hollow pipes are placed at intervals, main reinforcing bars are arranged parallel to the hollow pipes in the upper and lower parts between the hollow pipes, secondary reinforcing bars are arranged in the direction orthogonal to the main reinforcing bars, and the upper and lower 4111 A hollow slab in which prefabricated lattice-shaped reinforcing bars are longitudinally arranged between the main reinforcing bars and between the hollow pipes in parallel with the hollow pipes, and each is installed at a concrete conversion site.