CN101173542A - Two-way steel-laminated slab concrete composite floor - Google Patents

Abstract

The two-way steel-laminated slab concrete composite floor relates to a new type of large-span floor structure. The two-way steel-laminated slab concrete composite floor is composed of cross steel beams, prefabricated slabs and post-cast concrete. The intersecting steel girder is an I-shaped cross-section or a box-shaped cross-section steel girder; the prefabricated slab is an ordinary reinforced concrete slab or a prestressed concrete slab, supported on the upper flange of the crossing steel girder and covering the grid between the steel girders; The post-cast concrete is the concrete poured on the prefabricated slab and the steel beam. The two-way steel-laminated slab concrete composite floor of the present invention can exert the force bearing effect of two-way support, has the characteristics of low structural height, high bearing capacity and high rigidity, can save the process of formwork and formwork, and reduce the amount of wet concrete work on site. It is convenient for three-dimensional construction and shortens the construction period.

Description

Two-way steel-laminated slab concrete composite floor

technical field

The invention relates to a novel long-span floor structure (15m≤span L≤70m), which belongs to the field of structural engineering.

Background technique

In building structures, reinforced concrete rib beam floors, reinforced concrete well-shaped floors or unidirectionally supported steel-concrete composite beam floors are usually used. However, when the plane size and column distance of the building are significantly increased or vertical support members are not allowed indoors, these traditional floor structure forms cannot meet the requirements of the development of long-span structures in terms of bearing capacity, seismic performance, and construction speed. Require.

Contents of the invention

The purpose of the present invention is to provide a two-way supporting steel-concrete composite floor structure with large bearing capacity, convenient construction and low structural height.

Technical scheme of the present invention is as follows:

A two-way steel-laminated slab concrete composite floor is characterized in that it is composed of cross steel beams 1, prefabricated slabs 3 and post-cast concrete 4, and the various parts are combined into a whole through a shear connector 2; The cross steel beam 1 adopts I-shaped steel beam or box-shaped steel beam, and is located on the lower floor of the floor; The poured concrete 4 is the concrete poured on the prefabricated slab and the steel beam.

The prefabricated slab of the present invention is an ordinary reinforced concrete slab or a prestressed concrete slab. Steel bars are arranged in the post-cast concrete.

Compared with the prior art, the present invention has the following advantages and outstanding effects:

Compared with the reinforced concrete rib beam type floor and the reinforced concrete well-shaped floor, the two-way steel-laminated slab concrete composite floor can save formwork and formwork, reduce the amount of wet concrete work on site, facilitate three-dimensional construction, and shorten the construction period . Compared with the traditional one-way supporting steel-concrete composite beam floor, it can greatly reduce the structural height and improve the structural bearing capacity and rigidity.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of cross steel beams in the present invention.

Fig. 2 is a three-dimensional schematic view of the installation of prefabricated panels in the construction stage of the present invention.

Fig. 3 is a three-dimensional schematic diagram of the poured concrete after pouring in the embodiment of the present invention.

In the figure: 1-cross steel beam; 2-shear connector; 3-prefabricated slab; 4-post-cast concrete.

Detailed ways

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

The two-way steel-laminate slab concrete composite floor provided by the present invention is composed of three parts: cross steel beam 1, prefabricated slab 3 and post-cast concrete 4, and each part is combined into a whole to work together through shear connector 2. The cross steel beam 1 can be an I-shaped steel beam or a box-shaped steel beam, and is located on the lower floor of the floor; the connection method of the cross steel beam can be bolted or welded, and the number of steel beams, the cross-sectional size and the spacing of the steel beams are determined according to the application requirements . The shear connector 2 can be in the form of studs, channel steel, etc., and is a component that connects the steel beam and the concrete slab to work together. The upper and side surfaces of the prefabricated slab 3 should be rough to improve the degree of bonding with the post-cast concrete 4; less than 5cm; the prefabricated slab 3 can be ordinary reinforced concrete slab or prestressed reinforced concrete slab; the thickness of the prefabricated slab 3 should be determined according to the spacing of steel beams, when the prefabricated slab 3 is thin or the span of the prefabricated slab is large and does not meet the requirements of the construction process When the deformation requirements are met, a temporary support should be set under the prefabricated slab 3 during construction. The post-cast concrete 4 is the concrete poured above the prefabricated slab and the steel beam; the post-cast concrete 4 should ensure the compactness of the concrete at the notch. In order to prevent shrinkage and temperature cracks and from the perspective of floor stress, a certain number of steel bars should be arranged in the post-cast concrete 4 .

Construction procedure of the present invention is:

(1) Manufacture steel beams and welded shear connectors 2 in the factory;

(2) On-site installation of the cross steel beam 1;

(3) Install prefabricated slab 3 on the steel beam after cross steel beam 1 is installed in place;

(4) After the prefabricated slab 3 is installed, the post-cast steel bars are bound and the post-cast concrete 4 is poured.

Claims (3)

1. a bidirectional steel-stacked plate concrete composite building roof is characterized in that: be made up of intersection girder steel (1), precast plate (3) and last layer concrete (4), and by shear connector (2) described each several part be combined into integral body; Described intersection girder steel (1) adopts i section steel beam or box steel beam, is positioned at the lower floor of superstructure; Described precast plate (3) is supported on the top flange of intersection girder steel and covers the district's lattice that intersect between girder steel; Described last layer concrete (4) is for building in the concrete of precast plate and girder steel top.

2. bidirectional steel-stacked plate concrete composite building roof according to claim 1 is characterized in that: described precast plate (3) is ordinary reinforced concrete plate or prestressed concrete plate.

3. bidirectional steel-stacked plate concrete composite building roof according to claim 1 is characterized in that: dispose reinforcing bar in described last layer concrete (4).

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