Abstract: in this paper, the integral cast-in-place construction technology of steel-concrete composite beam deck concrete is described, including the installation and welding of steel box girder in sections, cantilever hanger formwork construction of box girder flange plate, integral cantilever pouring concrete, synchronous lifting and dropping beam to complete the bridge, and solves the key technology of integral cast-in-place construction of cantilever end of bridge flange plate and hanging formwork between boxes, as well as synchronous lifting and dropping beam technology, Steel box girder on the top of pier is installed with pre lifting value to form extrusion stress and improve the service life of bridge deck, so as to accumulate and exchange experience in the construction of similar bridges.<br>
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