Three-layer cantilever steel structure fast to build and capable of saving land and construction method thereof

Abstract

The invention relates to the technical field of structures covering large-area spaces, and discloses a three-layer cantilever steel structure fast to build and capable of saving land and a construction method thereof. The three-layer cantilever steel structure comprises a plurality of cross-layer trusses, a top bearing floor slab, a bottom floor slab, a hanging floor slab, and inhaul cables; one ends of the cross-layer trusses are anchored to a vertical installation foundation; the other ends of the cross-layer trusses are overhung outwards; the top bearing floor slab is laid on upper chord members of the cross-layer trusses; the bottom floor slab is laid on lower chord members of the cross-layer trusses; the hanging floor slab is hung below the cross-layer trusses; the lower ends of the inhaul cables are connected to the cross-layer trusses; the upper ends of the inhaul cables are connected to the vertical installation foundation in an obliquely upward mode; every two inhaul cables are combined into an inhaul cable pair; davits and the inhaul cable pairs are arranged in a one-to-one correspondence mode; each davit and the corresponding inhaul cable pair are connected to the same position of the lower chord members; the two inhaul cables in each inhaul cable pair are symmetrically connected to two sides of a node lower chord member; and the projections of the inhaul cables in the vertical direction fall outside the projections of the connected node lower chord members in the vertical direction. According to the structure, the available building area is obviously enlarged, and extra land occupation is not needed.

Description

technical field [0001] The invention relates to the technical field of structures covering a large space, in particular to a three-story cantilevered steel structure that can be erected quickly and saves land and a construction method thereof. Background technique [0002] Buildings such as exhibition halls have high requirements on the area, and at the same time, they must be able to be built quickly when there is a need for exhibitions, and may be expanded at any time due to changes in exhibition needs. The building with truss structure can meet the two requirements of large span and fast construction at the same time, so the building with truss structure is widely used in the exhibition hall. [0003] The main reason why the building with truss structure is built quickly is that its roof and supporting structure are prefabricated and can be built at one time. However, if it involves multi-layer structures, it still needs to be built layer by layer. Compared with ordinary ...

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Problems solved by technology

And if it is necessary to build each floor of a multi-storey truss building at the same time, its stress situation will become more complicated.

[0006] Taking a cross-floor truss with upward-pull cables and downward-pull suspenders as an example, the applicant found through force analysis that in such a truss, it is not appropriate to simultaneously bear a load perpendicular to the direction of the truss between the upper chord and the lower chord of the truss. The force of external pull, such a force is easy to break the truss into two pieces like bamboo; the same chord of the truss cannot bear too much shear, otherwise it will break; the various rods that make up the truss cannot be connected with the cables. There is cross contact between components such as / dangling column, otherwise it will not only affect the transmission of force in the cable / daviting column (the impact is especially serious when using prestressed cable), but also cause damage due to different materials (electrochemical corrosion) and easy dust accumulation. Severe rust at cross-contact locations

[0007] Because there are many problems to be solved, such as the suspension cable structure is not suitable for hanging loads, and the cables are not suitable for crossing with other chords (CN104775524B, CN101265727B and other documents point out various stress problems of trusses in this scenario) , the design of such a cantilevered steel structure with hangers and cables is particularly difficult

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