Prefabricated steel beam laminated slab two-way stress hollow floor system

Abstract

The utility model discloses a prefabricated steel beam laminated slab two-way stress hollow floor which can be applied to a steel structure and comprises prefabricated steel beams, longitudinal steel bar truss floor bearing plates, transverse rib beams, filling bodies and steel bar meshes. According to the prefabricated steel beam superposed bidirectional stress hollow floor assembly type bidirectional stress hollow floor, transverse rib beams are bound on site on steel bar trusses and are arranged orthogonally with longitudinal steel bar trusses, light filling bodies are placed in grid spaces formed by the longitudinal steel bar trusses and the transverse rib beams, steel bar meshes are laid on the top faces of the filling bodies, and the prefabricated steel beam superposed bidirectional stress hollow floor assembly type bidirectional stress hollow floor is formed. And through cast-in-place concrete, a bi-directional stress hollow floor is assembled and formed, and a floor system which is large in span, large in load, free of secondary beams under the slab and capable of preventing fire and corrosion is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of building engineering, in particular to an assembled steel structure bidirectionally stressed hollow floor slab. Background Art

[0002] In multi-story and high-rise steel structure buildings, the floor structure mostly adopts the floor form of steel truss floor slab, corrugated steel plate composite floor slab, steel truss composite slab, etc. The above floor forms have been widely used in steel structure buildings due to their good economy and simple construction, but they also have the following disadvantages:

[0003] 1. During on-site construction, it is not easy to install steel beams when connected with steel truss floor slabs, corrugated steel plate composite slabs, steel truss composite slabs and other floor slabs because there is no gap in the size processing.

[0004] 2. The spanning capacity of general floor slabs is small. When the span of a room is large, secondary beams need to be set up. The secondary beams affect the indoor appearance and use effect. In addition, the column grid is relatively dense, making it difficult to give full play to the advantages of light weight, high strength and strong spanning capacity of steel structures, limiting the advantages of steel structures in buildings.

[0005] 3. The current floor structure has exposed steel beams, which require anti-corrosion and fire-proofing treatments. The aging of anti-corrosion and fire-proofing coatings also brings many problems to the maintenance of the steel structure in the later stage, limiting the application of steel structures in residential buildings.

[0006] The biggest advantage of steel structure is its high strength and light weight, which allows for larger spans and flexible layout. In addition, the biggest disadvantage of steel structure is poor sound insulation, corrosion resistance and fire resistance. Therefore, in order to better promote the application and development of prefabricated steel structure buildings, it is necessary to develop a new type of building system based on the traditional steel structure system. On the basis of giving full play to the advantages of steel structure, it is necessary to avoid the problems of poor sound insulation, corrosion resistance and fire resistance of steel structure, so that people can accept steel structure buildings, and on this basis, reduce the cost as much as possible and realize assembly. This is an important technical issue in the current research on steel structure. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a prefabricated bidirectional force-bearing hollow floor slab which is simple and quick, ensures installation quality, improves work efficiency, has wide applicability, can adapt to large spans, prefabricated construction and has strong seismic resistance. Its purpose is to overcome the defects of the current technology and solve the problems of the existing prefabricated composite floor slabs, such as complex construction, difficult transportation and hoisting of prefabricated panels, inability to adapt to large span structures, poor fire resistance and corrosion resistance.

[0008] In view of the above existing technical problems, the utility model provides a prefabricated steel beam composite slab bidirectional force-bearing hollow floor and its construction method. Specifically, the technical solution is:

[0009] A prefabricated steel beam composite slab bidirectional force-bearing hollow floor slab, characterized in that it comprises a prefabricated steel beam, a longitudinal steel truss floor slab, a transverse rib beam, a filling body and a steel mesh;

[0010] The prefabricated steel beam comprises a steel beam, a bolt, concrete and connecting steel bars; the connecting steel bars are in the shape of an inverted trapezoid with an upper opening, and are placed above the lower flange plate of the steel beam; the bolts are welded to the web plate of the steel beam and the upper part of the lower flange plate of the steel beam, and the bolts are fixed in the inverted trapezoid concrete to form an inverted trapezoid support wrapped by concrete; the inverted trapezoid support supports the two ends of the longitudinal steel bar truss floor deck;

[0011] Preferably, the prefabricated steel beams use reinforced concrete beams instead of steel beams.

[0012] The longitudinal steel bar truss floor deck comprises a bottom plate and a longitudinally arranged steel bar truss, which are arranged in parallel and supported at both ends on the inverted trapezoidal support; the upper part of the longitudinal steel bar truss floor deck is tied with the transverse rib beam arranged orthogonally to the steel bar truss;

[0013] The steel truss comprises steel truss upper chord steel bars, steel truss lower chord steel bars and steel truss web bars;

[0014] Preferably, the bottom plate of the steel truss floor deck is made of steel plate or reinforced concrete plate.

[0015] Preferably, the steel trusses of the longitudinal steel truss floor deck are made of steel mesh.

[0016] The transverse rib beam comprises an upper transverse rib beam steel bar, a lower transverse rib beam steel bar and transverse rib beam stirrups, and the transverse rib beam is tied to the upper part of the longitudinal steel bar truss floor deck and is arranged orthogonally to the longitudinal steel bar truss;

[0017] Preferably, the transverse rib beam stirrups are U-shaped stirrups or S-shaped steel bar hooks.

[0018] Preferably, the upper steel bars of the transverse rib beam are located above the upper chord steel bars of the longitudinal steel bar truss, and the lower steel bars of the transverse rib beam are located above the lower chord steel bars of the longitudinal steel bar truss.

[0019] The filling body is arranged inside the square space formed by the longitudinal steel bar trusses and the transverse rib beams;

[0020] Preferably, the filler is made of a lightweight material or a hollow filler, or may be a plastic mold box in a trapezoidal shape.

[0021] The steel mesh is laid on the top surface of the filling body.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The utility model directly uses the prefabricated panels of assembled steel structure composite floor as the template. The inverted trapezoidal supports formed by the prefabricated steel beams enable the prefabricated panels to adapt to larger span requirements. There are no secondary beams under the panels, and it is convenient to connect the prefabricated panels with the steel beams. The connection between the steel bars and the steel beams is simpler and faster, eliminating the need for formwork and demolding construction, ensuring quality while speeding up construction, and fully adapting to the requirements and characteristics of the development of assembled steel structures.

[0024] The utility model can effectively reduce the floor thickness and the amount of steel beams used when applied to steel structure projects; the web of the steel beam and the upper part of the lower flange plate of the steel beam are wrapped with cast-in-place concrete, thereby increasing the fire resistance and corrosion resistance of the steel beam.

[0025] In the design of the utility model, when the design load of the floor slab is large, a reserved connecting steel bar connection is used instead of the bolt welding method to form an inverted trapezoidal symmetrical support with an upper width greater than the lower width. The symmetrical support is used to increase the connecting steel bars, which are tied to the steel bars in the longitudinal steel truss floor decking plate to form a force-bearing structure similar to the cap beam in the bridge structure, and the shear resistance of the steel beam is increased, which has a good earthquake-resistant effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0028] The serial numbers in the figure are: 101, bottom plate of steel truss floor deck; 102, lower chord steel bars of steel truss; 103, web bars of steel truss; 104, upper chord steel bars of steel truss; 201, lower steel bars of transverse rib beam; 202, U-shaped stirrups of transverse rib beam; 203, upper steel bars of transverse rib beam; 3, filling body; 4, steel mesh; 5, cast-in-place concrete; 601, steel beam; 602, connecting steel bars; 603, bolts. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] This embodiment provides a prefabricated steel beam assembled bidirectional force-bearing hollow floor slab, see Figure 1Specifically, the prefabricated steel beam includes a steel beam, bolts, concrete, and connecting steel bars. According to the thickness requirement of the longitudinal steel bar truss floor deck, bolts are welded on the web of the steel beam and the upper part of the lower flange plate of the steel beam, which are thicker than the longitudinal steel bar truss floor deck, to fix the inverted trapezoidal connecting steel bars with upper openings, and a formwork is set outside the lower flange plate of the steel beam, and concrete is poured on site to form an inverted trapezoidal support.

[0031] The utility model inverted trapezoidal support is prefabricated in a factory according to design structural requirements by fixing inverted trapezoidal connecting steel bars through bolts welded on an I-shaped steel beam and pouring concrete.

[0032] When the design load of the floor slab is large, when the design load of the longitudinal steel truss floor deck is large, the reserved connecting steel bars are used instead of the bolt welding method to fix it. This method can increase the binding of the connecting steel bars and the steel bars in the longitudinal steel truss floor deck. The shape is a symmetrical support with a larger width on the upper side than on the lower side, forming a force-bearing structure similar to the cap beam in the bridge structure, and also increases the shear resistance of the steel beam, with good earthquake resistance.

[0033] At the construction site, the supports at both ends of the longitudinal steel truss floor deck are directly installed on the inverted trapezoidal supports without the need for additional formwork.

[0034] Transverse ribs are tied on site to the longitudinal steel truss floor deck and arranged orthogonally to the longitudinal steel trusses. Filling bodies are placed in the squares formed by the longitudinal steel trusses and the transverse ribs. Steel mesh is laid on the top of the filling bodies. Concrete is poured on site to assemble and form a hollow floor slab subject to bidirectional forces.

[0035] The transverse rib beam is arranged orthogonally to the longitudinal reinforcement truss. The upper reinforcement of the transverse rib beam is located above the upper chord reinforcement of the longitudinal reinforcement truss, and the lower reinforcement of the transverse rib beam is located above the lower chord reinforcement of the longitudinal reinforcement truss. The stirrups of the transverse rib beam adopt U-shaped stirrups or S-shaped reinforcement hooks.

[0036] According to the stress distribution change area and node position, lightweight materials or hollow filling bodies of different models and specifications are arranged, and cast on site to form an integrated and intact assembled two-way stressed hollow floor.

[0037] Among them, lightweight materials or hollow filling bodies are processed by the factory, and the plane size is determined according to the steel truss floor, generally between 350-550mm, and the height is generally between 50-600mm depending on the load size.

[0038] The upper reinforcement of the longitudinal steel truss floor deck is directly made of steel mesh, which reduces the amount of on-site work, improves work efficiency, and is more in line with prefabricated requirements.

[0039] This embodiment provides an inverted trapezoidal support connection method between a steel truss floor deck and a prefabricated steel beam, which eliminates the installation of a template when connecting the steel beam to the steel truss floor deck and does not require bolt fixation, making installation more convenient.

[0040] In actual construction, corrugated steel plate composite slabs, reinforced truss composite slabs and other floor forms can be used to replace reinforced truss floor slabs, which are more widely used.

[0041] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can use the above technical content to make possible changes and modifications to the technical solution of the utility model without departing from the scope of the technical solution of the utility model, or modify it into an equivalent implementation plan with equivalent changes. Therefore, any changes and modifications made to the above implementation plan based on the technology of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope of the technical solution of the utility model.

Claims

1. A prefabricated steel beam composite slab bidirectional load-bearing hollow floor, characterized in that: It includes prefabricated steel beams, longitudinal steel truss floor decks, transverse rib beams, infills and steel meshes; The prefabricated steel beam comprises a steel beam, a bolt, concrete and connecting steel bars; the connecting steel bars are in the shape of an inverted trapezoid with an upper opening, and are placed above the lower flange plate of the steel beam; the bolts are welded to the web plate of the steel beam and the upper part of the lower flange plate of the steel beam, and the bolts are fixed in the inverted trapezoid concrete to form an inverted trapezoid support wrapped by concrete; the inverted trapezoid support supports the two ends of the longitudinal steel bar truss floor deck; The longitudinal steel bar truss floor deck comprises a bottom plate and a longitudinally arranged steel bar truss, which are arranged in parallel and supported at both ends on the inverted trapezoidal support; the upper part of the longitudinal steel bar truss floor deck is tied with the transverse rib beam arranged orthogonally to the steel bar truss; The transverse rib beam is tied to the upper part of the longitudinal steel bar truss floor deck and is arranged orthogonally to the longitudinal steel bar truss; The filling body is arranged in the square space formed by the longitudinal steel bar trusses and the transverse rib beams; The steel mesh is laid on the top surface of the filling body.

2. The prefabricated steel beam composite slab bidirectional load-bearing hollow floor according to claim 1, characterized in that: The steel truss comprises steel truss upper chord steel bars, steel truss lower chord steel bars and steel truss web bars; The transverse rib beam includes an upper transverse rib beam steel bar, a lower transverse rib beam steel bar and transverse rib beam stirrups. The upper transverse rib beam steel bar is located above the upper chord steel bar of the longitudinal steel bar truss, and the lower transverse rib beam steel bar is located above the lower chord steel bar of the longitudinal steel bar truss.

3. The prefabricated steel beam composite slab bidirectional load-bearing hollow floor according to claim 2, characterized in that: The transverse rib beam stirrups are U-shaped stirrups or S-shaped steel bar hooks.

4. The prefabricated steel beam composite slab bidirectional load-bearing hollow floor according to claim 1, characterized in that: The bottom plate of the steel bar truss floor deck is made of steel plate or reinforced concrete plate.

5. The prefabricated steel beam composite slab bidirectional load-bearing hollow floor according to claim 1, characterized in that: The filler is made of light material or a hollow filler and has a trapezoidal shape.

6. The prefabricated steel beam composite slab bidirectional load-bearing hollow floor according to claim 1, characterized in that: The steel trusses of the longitudinal steel truss floor deck are made of steel mesh.

7. The prefabricated steel beam composite slab bidirectional load-bearing hollow floor according to claim 1, characterized in that: The prefabricated steel beams use reinforced concrete beams instead of steel beams.

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