ABSTRACT
Mechanical equipment such as crushers, pneumatic drills and oxygen welding machines were used to break and clean the bridge deck structure of the main span. Large hydraulic shears were used to shear and break the 15 m long main girders over the sewage pipe. This served three functions. First, the cable forces of the causative bridge decreased considerably for the decrease in the bridge deck load. Second, the waves would decrease for the decrease of the possible collapsing objects. Third, the mechanics of the approximate balance between the main span and the side span would be achieved when the main girders over the sewage pipe had been broken.
