CN104929294A - Concrete composite plate with built-in cross hollow square steel pipes - Google Patents

Abstract

The concrete composite slab with built-in cross hollow square steel pipes belongs to the technical field of building materials. The square steel pipe layer is composed of horizontal square steel pipes and longitudinal square steel pipes. The upper and lower layers of the steel pipe layer, the square steel pipe layer and the bottom formwork are connected by hanging steel bars, after the two-way steel bar layers are bound, and the concrete composite plate is formed after pouring concrete; The square steel pipe layer is placed between the two-way steel bar layers, which has a large bearing capacity and a smaller thickness, which increases the net height of the floor and reduces the cost. It can be applied to structures with large spans and heavy loads; the structure has good rigidity and integrity; the floor plan The internal bearing capacity is high, and the ability to resist horizontal earthquakes is strong; the cross hollow steel pipe can be prefabricated in a factory, the quality is easy to be guaranteed, and the construction mechanization rate is high; the formwork construction during construction is convenient, the construction period is shortened, and the formwork is saved.

Description

Concrete composite slab with built-in cross hollow square steel pipes

technical field

The invention belongs to the technical field of building materials, and relates to a concrete composite slab, in particular to a concrete composite slab with built-in cross hollow square steel pipes.

Background technique

At present, in my country's industrial and civil buildings, due to the wide range of raw materials, mature technology and low cost, reinforced concrete structures are still the most widely used building structure forms. However, with the improvement of living standards and my country's comprehensive national strength, modern buildings have increasingly urgent requirements for floor height, flexible intervals, large spans, and large spaces. This requires architectural structure designers to devote themselves to researching new, more comfortable A reinforced concrete structural system with better technical and economic effects. At present, slabs with beams or slabs without beams are generally used in building floors. Because the slabs with beams in this system cannot meet the requirements of the clear height of the building and increase the height of the building, it is not conducive to earthquake resistance; and the traditional slab without beams is easy to withstand earthquakes due to its own weight. Deflection and cracks occur, so it cannot be used for large space and large span requirements of buildings. Therefore, it is particularly important to find a new structural form that can meet the functional requirements of the building and reduce the cost of the project to solve the problem of large bays and long-span floors.

Contents of the invention

The purpose of the present invention is to solve the shortcomings of traditional cast-in-place concrete floor slabs, which are heavy, easy to generate disturbance, cracks, and cannot be used in large spaces and large spans, and propose a concrete composite slab with built-in cross hollow square steel pipes. The purpose is to realize a It is a new structural form with high bearing capacity, light weight and convenient construction, which not only meets the functional requirements of the building, but also reduces the cost.

The technical solution of the present invention is: a concrete composite slab with built-in cross hollow square steel pipes, including horizontal square steel pipes, vertical square steel pipes, steel bars, bottom formwork and concrete, characterized in that the square steel pipe layer is composed of horizontal square steel pipes and longitudinal square steel pipes , the transverse square steel pipe and the longitudinal square steel pipe are welded to each other to form a cross-shaped square steel pipe layer, the steel bars are arranged along the X and Y directions to form a two-way steel bar layer, and the two-way steel bar layer is laid on the square steel pipe Above and below the layer, the square steel pipe layer and the bottom formwork are connected by hanging steel bars. After the two-way steel bar layers are bound, the concrete is poured to form a concrete composite slab of cross hollow square steel pipes.

The inner side of the longitudinal square steel pipe is long, and the transverse square steel pipe is welded on both sides of the longitudinal square steel pipe to form a cross shape.

Both the transverse square steel pipe and the longitudinal square steel pipe are rectangular in section, and the cross-sectional height of the longitudinal square steel pipe is greater than that of the transverse square steel pipe.

The bottom formwork can be wood formwork or steel formwork.

The two-way reinforcing bar layer is composed of reinforcing bars arranged at regular intervals along the X direction and the Y direction.

The beneficial effects of the present invention are: the concrete composite slab with built-in cross hollow square steel pipes provided by the present invention structurally places cross hollow square steel pipe layers between two-way reinforcement layers, and its bearing capacity is large. Under certain conditions, it is lighter in weight and smaller in thickness than ordinary floor slabs, which increases the net height of the floor and reduces the cost, and can be applied to structures with large spans and heavy loads; the structure has good rigidity, the overall deformation of the floor is very small, and the integrity is good; the floor plan The internal bearing capacity is high, and the ability to resist horizontal earthquakes is strong; the cross hollow steel pipe can be prefabricated in a factory, the quality is easy to be guaranteed, and the construction mechanization rate is high; the formwork construction during construction is convenient for construction, shortens the construction period, and saves formwork.

Description of drawings

Fig. 1 is a structural schematic diagram of a square steel pipe layer in the present invention.

Fig. 2 is a structural schematic diagram of the present invention.

Fig. 3 is A-A sectional view of the composite board of the present invention.

Fig. 4 is a schematic diagram of the lower-hanging structure of the bottom formwork in the present invention.

In the figure: horizontal square steel pipe 1, vertical square steel pipe 2, concrete 3, steel bar 4, two-way steel bar layer 5, bottom formwork 6, hanging steel bar 7.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1-4, the concrete composite slab with built-in cross hollow square steel tubes includes horizontal square steel tubes 1, longitudinal square steel tubes 2, steel bars 4, bottom formwork 6 and concrete 3, and consists of horizontal square steel tubes 1 and longitudinal square steel tubes 2. To form a square steel pipe layer, the horizontal square steel pipe 1 and the longitudinal square steel pipe 2 are welded to each other to form a cross-shaped square steel pipe layer, and the steel bars 4 are arranged along the X and Y directions to form a two-way steel bar layer 5, and the two-way steel bar layer 5 is laid on the square steel pipe layer Above and below, the square steel pipe layer and the bottom formwork 6 are connected through the hanging steel bar 7, after the two-way steel bar layer 5 is bound, the concrete composite slab that forms the cross hollow square steel pipe after pouring the concrete 3.

As shown in Figure 1-4, the concrete composite slab with built-in cross hollow square steel pipes, the longitudinal square steel pipe 2 has a long inner side, and the horizontal square steel pipe 1 is welded on both sides of the longitudinal square steel pipe 2 to form a cross-shaped square steel pipe layer; Square steel pipe 1 and longitudinal square steel pipe 2 are both rectangular in cross-section, and the cross-section height of longitudinal square steel pipe (long-span direction) 2 is greater than the cross-section height of horizontal square steel pipe (short-span direction) 1, and the selection of long-span and short-span should be based on the use of composite panels The occasion is determined, usually long spans in the length direction and short spans in the width direction; the entire cross hollow square steel pipe layer forms a whole, which improves the bearing capacity in the floor plane, and two-way reinforcement layers are arranged at the top and bottom of the square steel pipe layer, The two-way reinforcement layer 5 is evenly arranged by the reinforcement bars 4 along the X direction and the Y direction; the square steel pipe layer is placed between the two-way reinforcement layers; at the same time, the hollow square steel pipe can be arched according to actual needs to reduce the disturbance of the large-span cast-in-place slab. Spend.

As shown in Figure 1-4, for the concrete composite slab with built-in cross hollow square steel pipes, the cross hollow square steel pipe layer is hoisted first in the construction process, and then the bottom hanging steel bar 7 is welded on the square steel pipe layer, and the bottom hanging steel bar is used 4 Lift the bottom formwork 6, and the gravity load of the entire bottom formwork 6 is transmitted to the cross hollow square steel pipe layer through the hanging steel bars 7. After the bottom formwork 6 is hoisted, the double-layer two-way reinforcement layer 5 of the binding plate is arranged. Because the thickness of the large-span cast-in-place slab is often thicker, the hanging steel bar 7 cannot bear the load produced by the one-time pouring of concrete, so the concrete can be poured twice.

Claims (5)

1. Concrete composite slab with built-in cross hollow square steel pipes, including horizontal square steel pipes (1), longitudinal square steel pipes (2), steel bars (4), bottom formwork (6) and concrete (3), characterized in that: The square steel pipe (1) and the longitudinal square steel pipe (2) form a square steel pipe layer, and the transverse square steel pipe (1) and the longitudinal square steel pipe (2) are mutually welded to form a cross-shaped square steel pipe layer, and the steel bars ( 4) Arranging along the X and Y directions to form a two-way reinforcement layer (5), laying the two-way reinforcement layer (5) above and below the square steel pipe layer, the square steel pipe layer and the bottom formwork (6) The two-way steel bar layer (5) is bound through the connection of the down-hanging steel bars (7), and the concrete (3) is poured to form a concrete composite slab of cross hollow square steel pipes. 2. The concrete composite slab with built-in cross hollow square steel pipes according to claim 1, is characterized in that: the inner sides of the horizontal and vertical square steel pipes (2) are long, and the horizontal square steel pipes (1) are welded to the longitudinal square steel pipes ( 2) The two sides form a cross shape. 3. The concrete composite slab with built-in cross hollow square steel pipes according to claim 1, characterized in that: the transverse square steel pipes (1) and the longitudinal square steel pipes (2) have rectangular sections, and the longitudinal square steel pipes (2) The cross-section height is greater than the cross-section height of the transverse square steel pipe (1). 4. The concrete composite slab with built-in cross hollow square steel pipes according to claim 1, characterized in that: the bottom formwork (6) can be a wood formwork or a steel formwork. 5. The concrete composite slab with built-in cross hollow square steel pipes according to claim 1, characterized in that: the two-way reinforcing bar layer (5) is made of reinforcing bars (4) arranged at regular intervals along the X direction and the Y direction.