selection of the composite girder making full use of the high compression of concrete and high tensile of steel, As steel is easy for factory process and site assembly, the structure with the bottom steel plate can be used both for the formwork and for part of the deck and main girder.

2 quay of a shipyard The covering slabs were provided with mooring anchors on the inner side and precast on large steel plate bottom formwork,i.

Anticorrosion treatment of exposed reinforcement under concrete floor;