CN105649249A - Bidirectional profiled steel sheet and concrete composite floor slab internally provided with hollow circular steel pipes - Google Patents

Abstract

The invention discloses a bidirectional profiled steel sheet and concrete composite floor slab internally provided with hollow circular steel pipes. The bidirectional profiled steel sheet and concrete composite floor slab internally provided with the hollow circular steel pipes comprises a profiled steel sheet, the hollow circular steel pipes and a truss type reinforcement mesh. The profiled steel sheet is fixed to steel beams to serve as a lower formwork and a lower carrying bar. The hollow circular steel pipes are arranged in grooves and rib tops of the profiled steel sheet and the upper portions of the grooves. Every two hollow circular steel pipes are connected in a welded mode through steel bars so as to form the truss type reinforcement mesh and be fixed into a whole. Upper plate distribution steel bars are arranged in the direction perpendicular to the hollow circular steel pipes at intervals. The bidirectional composite floor slab is formed by supporting the formwork on the side face of the profiled steel sheet and pouring concrete. According to the bidirectional profiled steel sheet and concrete composite floor slab internally provided with the hollow circular steel pipes, the bearing capacity of the internal hollow circular steel pipes is high, the weight is lower, the thickness is smaller, the clear height of a storey is increased, and the construction cost is reduced; through the truss type steel bars, the shear resistance and bearing capacity of the oblique section of the floor slab are improved, and meanwhile the integrity of the composite floor slab and the binding force between the profile steel sheet and concrete are improved; and the bidirectional profiled steel sheet and concrete composite floor slab is particularly suitable for serving as large-span and large-load bidirectional slabs.

Description

Two-way composite floor with profiled steel plate and concrete with built-in hollow circular steel pipe

technical field

The invention belongs to the technical field of buildings, in particular to a profiled steel plate concrete two-way composite floor with built-in hollow circular steel pipes.

Background technique

At present, in my country's industrial and civil buildings, reinforced concrete structure is still the most widely used architectural structure form due to its wide range of raw materials, mature technology and low cost. However, with the improvement of building height and anti-seismic requirements, as well as the increasing requirements of modern buildings for storey height, large span and large space, the application of reinforced concrete structures has been more restricted. In recent years, the development of reinforced concrete composite structures has brought many advantages, and more and more pressed steel plate concrete composite floors are used as building floor systems in composite structures. The profiled steel plate concrete composite floor can give full play to the advantages of steel tensile strength and concrete compression resistance according to the location and characteristics of its components, and has good seismic performance and construction performance. Technology has developed rapidly. In particular, the promulgation and implementation of "Code for Design and Construction of Composite Floor Slabs" (CECS273:2010) has greatly promoted the development of profiled steel plate concrete composite floors.

There are some technical problems in the traditional reinforced concrete floor slab and the composite steel plate concrete composite floor system as follows: (1) Cast-in-place reinforced concrete floor slab: the self-weight is too large, it is easy to generate disturbance and cracks, and it is troublesome to install and remove the formwork Moreover, the construction period is long, and the beam slabs often cannot meet the requirements of the clear height of the building and increase the storey height, and the non-beam slabs have poor seismic performance and are prone to disturbance and cracks. In particular, if the floor slabs with large spans and heavy loads adopt the above-mentioned type of floor slabs and are designed according to the current "Code for Design of Reinforced Concrete Structures", they will face the problems of too thick slabs, too heavy self-weight and difficult to meet the requirements of cracks. (2) Profiled steel plate concrete composite floor: The thickness of the long-span profiled steel plate concrete composite floor is too thick and the self-heavy, the bonding ability between the profiled steel plate and concrete is poor. Research on longitudinal shear bond bearing capacity of steel plate composite floor, "Sichuan Building Science Research" 2012, 38 (02): 52-54) verified through experiments that one of the main failure modes of profiled steel composite floor is longitudinal horizontal shear bond If the joint is damaged, the lack of sufficient bonding capacity will make the composite floor of the profiled steel plate lose its combined effect.

Contents of the invention

The object of the present invention is to provide a profiled steel plate concrete two-way composite floor with built-in hollow circular steel pipes with high bearing capacity, light weight and convenient construction.

The technical solution to realize the purpose of the present invention is: a profiled steel plate concrete two-way composite floor with built-in hollow circular steel pipes, including profiled steel plates, hollow circular steel tubes and truss-type steel mesh, and the profiled steel plates are fixed on steel beams as the lower part The formwork and the lower part of the plate are stressed, and hollow round steel pipes are arranged on the groove, rib top and upper part of the groove of the profiled steel plate. The hollow round steel pipes are welded in pairs to form a truss-type steel mesh and fixed into a whole. The direction perpendicular to the hollow circular steel pipe is arranged at intervals to distribute steel bars on the slab, and concrete is poured on the side support formwork of the profiled steel plate to form a two-way composite floor slab.

Compared with the prior art, the present invention has significant advantages: (1) The built-in hollow circular steel pipe has a large bearing capacity, and under the same bearing capacity, it is lighter in weight and thinner than ordinary profiled steel plate concrete composite floors, improving the The net height of the floor reduces the cost, and the truss-type steel bars improve the shear bearing capacity of the oblique section of the floor, and also improve the integrity of the composite floor and the bonding force between the profiled steel plate and the concrete, especially suitable for two-way slabs with large spans and heavy loads In, such as stadiums, large exhibition halls, railway stations and so on. (2) Hollow round steel pipes and profiled steel plates can be prefabricated in factories, the quality is easy to be guaranteed, and the construction mechanization rate is high. (3) During the construction, the self-supporting profiled steel plate serves as the lower formwork, which is convenient for construction, shortens the construction period and saves formwork.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a structural schematic diagram of a profiled steel plate concrete two-way composite floor with built-in hollow circular steel pipes according to the present invention.

Fig. 2 is a sectional view of the present invention.

detailed description

1 and 2, the profiled steel plate concrete two-way composite floor with built-in hollow circular steel pipes of the present invention includes profiled steel plates 2, hollow circular steel tubes 3 and truss-type steel mesh 4, and the profiled steel plates 2 are fixed on steel beams to act as The lower formwork and the stress ribs at the lower part of the plate, the hollow round steel pipes 3 are arranged in the groove 6, the rib top 7 and the upper part of the groove of the profiled steel plate 2, and the hollow round steel pipes 3 are connected in pairs by steel bars to form a truss-type steel mesh 4 and fixed To form a whole, the steel bars 5 are arranged at intervals in the direction perpendicular to the hollow circular steel pipe 3, and the formwork is poured with concrete 1 on the side of the profiled steel plate 2 to form a two-way composite floor.

A concrete protection layer is arranged on the distributed reinforcing bars 5 on the board of the present invention.

Example

Combined with Figure 1 and Figure 2, the profiled steel plate 2 is first laid during the construction process, and the profiled steel plate 2 is fixed on the steel beam as the lower formwork and the stress ribs at the lower part of the plate (the profiled steel plate is placed at the bottom of the plate). The groove 6, the rib top 7 and the upper part of the groove of 2 are arranged with hollow round steel pipes 3, and then they are welded two by two to form a truss type steel mesh 4 and fixed to become a whole, and then the hollow round steel pipe 3 is perpendicular to the hollow round steel pipe 3. Arrange the reinforcement bars 5 on the upper part of the board at intervals in the direction and leave an appropriate concrete protective layer, and finally pour the concrete 1 with the side formwork.

Claims (2)

1. the profiled sheet concrete bidirectional composite floor of a built-in open circles steel pipe, it is characterized in that including profiled sheet (2), open circles steel pipe (3) and trussed reinforcing bar network (4), this profiled sheet (2) is fixed on girder steel and serves as bottom template and plate bottom principal rod, groove (6) in profiled sheet (2), open circles steel pipe (3) is arranged on rib top (7) and groove top, each open circles steel pipe (3) is fixed by reinforcement welding connection formation trussed reinforcing bar network (4) between two and is become an entirety, on the installation plate top, interval, direction distribution bar (5) being perpendicular to open circles steel pipe (3), lateral support template casting concrete (1) at profiled sheet (2) forms bi-directional combination floor.

2. the profiled sheet concrete bidirectional composite floor of built-in open circles steel pipe according to claim 1, it is characterised in that on plate top distribution bar (5), concrete cover is set.