CN204919932U - Assemble integral non -reinforced concrete ribbed floor - Google Patents

Abstract

The utility model discloses an assembled integral unreinforced concrete densely ribbed floor, which comprises a steel plate girder forming a cross beam system and a prefabricated plate installed on the cross beam. The cross section of the steel plate beam is U-shaped, and the U-shaped steel plate beam Square anti-slip connectors are fixed at intervals on the inner side of the cross beam system, and the four corners of the cross beam system are connected with the surrounding frame columns. Because the span of the prefabricated slab grid is small in the utility model, the slab thickness can be reduced to about half of the thickness of the common reinforced concrete floor, and because the height of the U-shaped steel plate girder is lower than the beam height of the traditional reinforced concrete floor with the same span, thus The self-weight of the floor is significantly reduced, and the structural height of the floor is effectively reduced; the on-site construction is convenient and fast, without any formwork, and is green and environmentally friendly.

Description

Assembled monolithic unreinforced concrete ribbed floor

technical field

The utility model relates to the field of civil engineering, in particular to a densely ribbed floor.

Background technique

Due to the large primary and secondary beam sections and floor thickness of ordinary reinforced concrete floors, the structural self-weight usually accounts for 30% to 40% of the total building weight. In high-rise reinforced concrete buildings, the floor self-weight accounts for 50% of the total self-weight. ~60%, and in large column net buildings with a span of more than 9m, the proportion will reach 60%~80%. Therefore trying to reduce the weight of the floor is very important for reducing the weight of the whole building. The higher primary and secondary beam sections also affect the practical headroom of the floors.

Ordinary reinforced concrete cast-in-place beam-slab floors require a large number of formwork to be erected on the construction site, and cracks are prone to occur when large-area cast-in-place concrete is carried out, and the construction period is long, which does not meet my country's "building industrialization" and "green construction " requirements.

Contents of the invention

Purpose of the invention: The purpose of this utility model is to address the deficiencies of the prior art and provide an assembled integral unreinforced concrete dense rib floor with reasonable force, light weight, high rigidity, and no formwork required on site.

Technical solution: The utility model provides an assembled integral unreinforced concrete densely ribbed floor, which includes steel plate beams forming a cross beam system and prefabricated panels installed on the cross beams. The cross section of the steel plate beams is U-shaped. On the inner side of the U-shaped steel plate beams, quadrilateral anti-slip connectors are fixed at intervals, and the four corners of the cross beam system are connected with the surrounding frame columns.

Preferably, the steel plate girder is provided with anti-slip connectors at intervals of 300-500 mm along the length direction inside the steel plate girder, which can prevent slippage between the steel plate girder and the post-cast concrete, so as to ensure that the two work together.

Further, the steel plate girder is formed by bending thin steel plates of 3-5 mm, and the longitudinal and transverse steel plate girders are spliced into a cross beam system by bolts or welding.

Further, the periphery of the prefabricated panel is provided with an angle steel frame so as to be connected with the flange of the steel plate girder.

Further, the prefabricated panel is a steel fiber cement reinforced prefabricated panel, which is made of fine steel mesh and steel fiber cement.

Further, since the span of the prefabricated slabs described in the present invention is 1-2m, the thickness is 40-60mm, which is only about half of the thickness of ordinary reinforced concrete slabs, so that the structural height and self-weight of the slabs are significantly reduced, which is different from traditional slabs. Compared with the cover, it can reduce the weight by about 40%, and increase the headroom by more than 200mm.

Preferably, the frame column is a reinforced concrete frame column or a steel frame column.

Beneficial effects: 1. The floor is light in weight; the utility model is composed of steel plate girders, which greatly reduces the span of the prefabricated slab, so its thickness can be reduced to about half of the thickness of ordinary reinforced concrete floors; on the other hand, The bearing capacity of the U-shaped steel plate girder of the utility model is higher than that of the traditional reinforced concrete beam, so its girder height is smaller than the traditional beam of the same span, so the dead weight is also reduced; Concrete traditional floors can reduce weight by more than 40%, and the corresponding foundation reaction force and earthquake force will also be significantly reduced, which will directly lead to the reduction of foundation depth and earthwork excavation, and the cost savings of foundation pit support will be very obvious ;

2. The structure height is low; because in the floor of the utility model, the height of the U-shaped steel plate girder is obviously lower than the beam height of the traditional reinforced concrete floor, thereby reducing the structural height of the floor and directly compressing the building floor height. Under the constant situation of keeping the total height of the building, the number of floors can be increased; for example, a 30-story high-rise building, if the novel floor of the utility model is adopted, the average floor height of each floor can be reduced by at least 200mm. The additional construction area of two standard floors will bring considerable direct economic benefits;

3. There is no need for formwork on site; because the U-shaped steel plate girder in the utility model not only replaces the stressed steel bar, but also acts as a formwork, so the new floor structure of the utility model does not need any formwork, which saves formwork engineering The cost, and greatly shorten the construction period;

4. The construction is fast and environmentally friendly; compared with the existing reinforced concrete floor structure, only a small amount of concrete pouring work in the steel plate girder is left on site, so that the workload of the operators on the site is reduced to a minimum. Realized rapid green construction and brought significant economic and social benefits.

Description of drawings

Fig. 1 is the structure schematic diagram of the utility model assembled monolithic unreinforced concrete dense rib floor;

Fig. 2 is the top view of assembling integral unreinforced concrete densely ribbed floor;

Fig. 3 is a schematic cross-sectional view of a U-shaped steel plate girder.

Detailed ways

The technical solutions of the utility model are described in detail below, but the protection scope of the utility model is not limited to the embodiments.

Embodiment: An assembled monolithic unreinforced concrete ribbed floor, as shown in Figures 1 and 2, includes steel plate girders 1, anti-slip connectors 2, prefabricated slabs 4 and frame columns 3. The span of the floor in this embodiment is 6m×6m, and the live load of the floor is 2KN per square meter. and height are 150mm and 220mm respectively. Horizontal and longitudinal steel plate girders 1 are spliced into a cross-beam structure. An anti-slip connector 2 is welded every 300mm on the inner side of the steel plate girder 1. As shown in Figure 3, the anti-slip connector 2 is a The quadrilateral part prevents slippage between the steel plate and the post-cast concrete 6 to ensure that the two work together. The prefabricated slab 4 is a steel fiber cement reinforced prefabricated slab 4 with a thickness of 40 mm. It is made of fine steel mesh and steel fiber cement, and is equipped with an angle steel frame 5 around it. between cells. The four corners of the cross beam system are respectively connected with reinforced concrete frame or steel frame column 3.

The construction method of the above-mentioned assembled integral unreinforced concrete densely ribbed floor: firstly, the thin steel plate is formed into a U-shaped steel plate girder 1 by a bending machine, and the inner side of the steel plate girder 1 is spot-welded at regular intervals along the longitudinal direction for anti-skid Move the connecting piece 2, and then transport the steel plate girder 1 to the construction site. By means of bolts or welding, the longitudinal and transverse U-shaped steel plate girders 1 are assembled into a cross beam system, and connected to the side of the surrounding reinforced concrete frame or steel frame column 3 . Between the grids of the cross-beam system, install the prefabricated slab 4 reinforced by steel brazing cement. Then pour concrete 6 in the U-shaped steel plate beam 1, so that the beam and the plate are effectively connected to form an integral floor, that is, all the installation work of the floor is completed.

This embodiment assembles the integral unreinforced concrete ribbed floor, which not only absorbs the advantages of "industrialized production" of the fabricated floor and "good integrity" of the cast-in-place floor, but also avoids the large-area cast-in-place concrete that is easy to crack and construction Disadvantages such as long cycle time. Only limited concrete is poured in the steel plate girder 1, so that the workload on site is reduced to a minimum. The structure has the characteristics of large span, light weight, no need for any formwork, convenient and quick construction, and low overall cost. It is a new type of floor structure system suitable for large column nets and large bays.

Since the U-shaped steel plate girder 1 in the ribbed girder relies on the built-in anti-slip connector 2 to cooperate with the concrete, there is no need to configure the stressed steel bars in the girder. Previous experimental studies have shown that the new composite floor structure has high overall rigidity and high bearing capacity, showing typical ductile failure characteristics. Under the same design load, the self-weight is reduced by about 40% compared with the reinforced concrete floor with the same span, and the headroom of each floor can be increased by more than 200mm, which has good comprehensive economic benefits.

Claims (7)

1. an assembled integral plain concrete close rib building roof, it is characterized in that: comprise the plate girder forming grillage and the precast plate be arranged on cross coupling, the cross section of described plate girder is U-shaped, U-shaped plate girder clear width be fixed with the resistant slide connector of quadrangle, the corner of described grillage is connected with the frame column of periphery.

2. assembled integral plain concrete close rib building roof according to claim 1, is characterized in that: described plate girder arranges resistant slide connector every 300 ~ 500mm within it along its length.

3. assembled integral plain concrete close rib building roof according to claim 1, is characterized in that: described plate girder is by the steel sheet bending forming of 3 ~ 5mm, and longitudinal and horizontal plate girder is spliced into grillage by bolt or welding.

4. assembled integral plain concrete close rib building roof according to claim 1, is characterized in that: the periphery of described precast plate is provided with angle steel frame.

5. assembled integral plain concrete close rib building roof according to claim 1, is characterized in that: described precast plate is that steel fiber feinforced cement strengthens precast plate, is cast form by fine steel rib net and steel fiber feinforced cement.

6. assembled integral plain concrete close rib building roof according to claim 1 or 5, is characterized in that: the span of described precast plate is 1 ~ 2m, and thickness is 40 ~ 60mm.

7. assembled integral plain concrete close rib building roof according to claim 1, is characterized in that: described frame column is reinforced concrete frame column or Steel Frame Column.