32results about How to "Safe and fast construction" patented technology

The invention discloses a through prestress steel truss and concrete combined continuous steel structure bridge and a construction method of the bridge. Upper chord members and lower chord members of a steel truss beam are respectively in hollow structures, vertical prestress steel bundles are arranged inside the upper chord members of the steel truss beam for bearing the hogging moment, concrete is filled inside the lower chord members, concrete bottom plates are formed between the lower chord members in a cast-in-situ way, the concrete is filled in the upper chord members of the steel truss beam for bearing sagging moment, the lower chord members are fixedly connected for forming steel bridge panels, and the concrete bottom plates and the steel bridge panels form bridge surface bases. The concrete consumption is obviously reduced, because the bridge surface is positioned in a position corresponding to the lower chord rods, the steel structure bridge has higher universality and can be applicable to environment with confliction in height differences between the headway and the pavement at two ends of the bridge, the bridge surface height can be reduced and regulated according to environment requirements, the navigation under the bridge and the smooth butt joint between the bridge surface and the pavements at two ends can be ensured, great construction transformation on the pavements at two ends is avoided, and the construction cost is greatly saved.

A bridge magnetic levitation pushing system comprises a magnetic levitation pushing main beam hollow box-shaped structure and a magnetic levitation pushing platform. The magnetic levitation pushing platform comprises a pushing platform base, two bottom surface steel plates, two electromagnets, two Teflon sliding plates and a plurality of steel tube concrete rollers. The magnetic levitation pushing main beam hollow box-shaped structure comprises a steel truss abdomen bridge framework and two permanent magnets. According to the bridge magnetic levitation pushing system, by means of the repulsive force of a magnetic field, the magnetic levitation pushing main beam hollow box-shaped structure is pushed so that friction force and resistance in pushing-pulling traction can be reduced and continuous pushing operations can be carried out, pushing is needless to be interrupted, the construction progress is quick, construction is safe and efficient, construction cost is reduced, noise is low in pushing, fuel is needles, environment is protected, energy is saved, and operations are simple. The invention further relates to a two-stage cantilever manufacturing method.