Method for construction of bridge cast-in-situ pre-stressed concrete continuous beam

The invention belongs to the technical field of bridge engineering construction, particularly relates to a method for the construction of a bridge cast-in-situ pre-stressed concrete continuous beam, which solves the problems that the existing construction method is incapable of meeting the requirements for construction period, imposes strict requirements for the bearing capacity and operation space of a foundation, and has high-workload and uneconomic foundation reinforcement. The method comprises the following steps: building a tied-arch support below the position where the concrete continuous beam is arranged; arranging a vertical supporting structure below the position of the tip of the concrete continuous beam; then, building a formwork system above the tied-arch support; and sequentially constructing the beam 'from middle to two sides', and reserving closure segments at two sides of the beam, wherein the tied-arch support comprises an arch part and a tie bar connected in a hinged way, and a support is arranged at the bottom of the tie bar. Accordingly, the invention has the following beneficial effects: the method which is not restricted by the construction environment and conditions can reduce the construction period, save the construction cost, meet the requirements for cast-in-situ construction and prevent the existing structure from being damaged by the stress system; and the method has the advantages of wide applicable range, high material recovery rate and obvious economic benefit.