Large-span prestress concrete continuous beam deepwater pier construction process

The invention discloses a large-span prestress concrete continuous beam deepwater pier construction process, which comprises the following steps of: crushing and excavating of an underwater bed rock: conducting impact crushing on the underwater bed rock by adopting impact crushing equipment, excavating and transporting impact-crushed rocks by adopting a long-boom excavator until the underwater bed rock is excavated to the designed depth; construction of an underwater cushion cap including the following steps: determining cofferdam structure and size, measuring payed off, lowering the cofferdam, installing a steel casing, constructing cofferdam bottom sealing, constructing a bored pile, pumping in the cofferdam, cutting the steel casing and constructing the cushion cap; and construction of pier stud at the upper part of the cushion cap: constructing a reinforced concrete pier body on the underwater cushion cap formed by construction. The large-span prestress concrete continuous beam deepwater pier construction process is reasonable in construction step design, convenient to construct, low in construction cost, short in construction period, and good in construction effect, and can ensure the construction quality of underwater piers of constructed railway terminal bridges, and has small interference on the construction process on the running process of the existing line.