JP2763443B2 - Beam and floor structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam and floor structure relating to the synthesis of a steel plate and a reinforced concrete as a load-bearing member also serving as a formwork.

[0002]

2. Description of the Related Art Various beam floor structures using a steel plate as a permanent form have been developed. And in general, a beam-shaped steel plate with a U-shaped cross section is combined with a slab floor formwork arranged between beams, reinforcing bars are arranged on the upper part, and concrete is cast, but it is difficult to expect the strength of the steel plate, In many cases, temporary support is required. Moreover, the beam and the slab may be considerably large. The present invention has been developed in view of the above circumstances, and provides a structure that can withstand the load at the time of placing concrete without using a temporary material, uses a steel plate as a structural material, and has a low beam structure. Aim.

[0003]

A beam and a floor structure according to the present invention are provided by arranging a reinforcing bar in a steel plate having a box-shaped cross section serving as a load-bearing member, and filling the steel plate with concrete from a concrete placing hole. The upper half of the steel plate having the box-shaped cross section is located in the concrete floor slab, and when the steel plate serving as the slab bottom is provided, it is provided between the intermediate heights of the beam side surfaces. Further, it may be constituted by a square wave steel plate obtained by connecting steel plates having a U-shaped cross section.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION A beam A has a reinforcing steel bar 2 arranged inside a box-shaped steel plate 1 serving as a load-bearing member having a closed cross section (FIG. 1a) or a U-shaped cross section open upward (FIG. 1b). The steel plate 1 is filled with concrete 5 from the casting hole 3 (FIG. 1a) or the concrete casting hole 4 (FIG. 2a) on the upper side surface of the steel plate 1. Note that the reinforcing bar 2 in the steel plate 1 may be an assembled reinforcing bar in which upper and lower chords are connected by ribs, or a plurality of other reinforcing bars.

The upper half of the steel plate having the box-shaped cross section of the beam A is located in the concrete floor slab B. Then, the reinforcing bar 6 of the slab is placed and arranged on the upper or upper side of the beam A. In addition, embossing is performed on the side surface of the steel plate 1 as necessary. In some cases, a number of holes are provided in the upper part of the side surface of the steel plate 1 to integrate the beam and the slab through concrete. Further, the steel sheet 1 may be a connected square wave steel sheet (FIG. 2).

A receiving flange 7 protrudes from the intermediate height of the side surface of the beam A, and a steel plate 8 such as a keystone plate and a corrugated iron plate is disposed on the receiving flange 7 to cast a slab concrete 9. . The receiving flange 7 can be formed to hang down from the connecting plate 10.

The steel sheet 1 of the beam A may be vertically separated and joined together in addition to the case where one sheet is bent and formed. (FIG. 2a)
In addition, it is also possible to introduce tension into the reinforcing bar 6 in advance and connect it to the steel plate 1 to support the steel plate 1 and to introduce prestress into the slab concrete after the concrete is poured and hardened. After the concrete is hardened, the reinforcing bar 6 can be tensioned.

Further, a steel plate 8 serving as a floor can be arranged between the respective parts of the steel plate 1 (FIG. 2B).

Other modifications are as shown in the drawings. The slab reinforcing bar 6 may be a mesh bar.

A hollow member 11 can be inserted into the upper part of the steel plate 1 to reduce the weight of the slab.

[0011]

According to the present invention, the upper half of a box-shaped steel plate serving as a load-bearing member of a beam is embedded in slab concrete, so that integration of the beam and the slab is ensured, and And the floor structure composed of slabs can be made smaller. Reinforcement and concrete are arranged in the steel plate of the beam, and the steel plate is also used as a load-bearing material.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

2 (a) and 2 (b) are longitudinal sectional views in another embodiment of the present invention.

FIG. 3 shows (a), (b), (c) and (d) in another embodiment of the beam part of the present invention.
(e), (f), (g), and (h) are perspective views of beam steel plates of different examples.

FIG. 4 shows (a), (b) and (c) of another embodiment of the beam portion of the present invention.
(d), (e) and (f) are perspective views of different embodiments.

[Explanation of symbols]

A: Beam, B: Slab 1 ... Steel plate, 2 ... Reinforcing bar, 3, 4 ... Concrete pouring opening, 5
... concrete, 6 ... rebar, 7 ... receiving flange, 8 ... steel plate, 9 ... slab concrete, 10 ... connecting material, 11 ... hollow material.

Claims (2)

(57) [Claims] 1. A steel bar having a box-shaped cross section serving as a load-bearing member, a reinforcing bar arranged therein, a concrete being filled in the steel plate from a concrete placing hole of the steel plate to form a beam, and a steel beam having the box-shaped cross section. A beam and floor structure wherein the upper half is embedded in a concrete floor slab. 2. The beam and floor structure according to claim 1, wherein a steel plate serving as a slab bottom is provided between the beam side intermediate heights.