Partial cable-stayed bridge of steel truss web type concrete composite beam and construction method thereof

Abstract

The invention discloses a partial cable-stayed bridge of a steel truss web type concrete composite beam and a construction method thereof. The cable-stayed bridge comprises main beams, each main beamcomprises a tower beam consolidation area, a beam end area and a steel truss web area, a main tower is arranged at the tower beam consolidation area, stay cables are arranged between the main tower and the main beams, each main beam steel truss web area comprises a concrete top plate and a concrete bottom plate, and a steel truss web is arranged between the concrete top plate and the concrete bottom plate. The construction method comprises the steps of assembling the steel truss web sections; hanging stay cables between the main tower and the main beams, and completing initial tensioning; pouring a concrete top plate by taking the steel truss web sections as supports of a cast-in-place platform; pouring a concrete bottom plate by taking the steel truss web sections as a support of the cast-in-place platform; curing the concrete top plate and the concrete bottom plate; tensioning the transverse retard-bonded prestressed steel beams; and carrying out next section construction. The earthquake working condition applicability of a traditional concrete partial cable-stayed bridge is broadened, and the cable-stayed bridge has wide application prospects in large-span bridges in high-intensity earthquake areas.

Description

technical field [0001] The invention belongs to the field of bridge spanning systems, in particular to a partial cable-stayed bridge with steel truss webbed concrete composite beams and a construction method thereof. Background technique [0002] Concrete partial cable-stayed bridge is a commonly used bridge structure. Generally, the bearing capacity of the structure is improved by setting bridge towers and cable-stayed cables on continuous beams or rigid structures. The main concrete beam is the main force-bearing component, and the cable-stayed cables are auxiliary The effective tower height is generally 1 / 8~1 / 12 of the main span. The main girder of this type of bridge has a large self-weight. When the main span is large and it is located in a high-intensity earthquake zone, its seismic response is very large. It is necessary to install super-large-tonnage shock-absorbing and isolation bearings, and the substructure such as piers and foundations is large in scale and econo...

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Problems solved by technology

The main girder of this type of bridge has a large self-weight. When the main span is large and it is located in a high-intensity earthquake zone, its seismic response is very large. It is necessary to install super-large-tonnage shock-absorbing and isolation bearings, and the substructure such as piers and foundations is large in scale and economical. sexual irrationality

At the same time, the transverse prestressing of concrete main girders generally adopts conventional steel strands. After tensioning, the prestressed tunnels need to be grouted and closed. When located in cold regions, it is difficult to control the quality of grouting

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