Construction method for erecting prefabricated box girders through walking type bridge girder erection machine

The invention relates to the field of bridge construction, in particular to a construction method for erecting prefabricated box girders through a walking type bridge girder erection machine. The method includes the steps that the prefabricated box girders transported through a girder transporting vehicle are lifted at the rear end of the bridge girder erection machine; components such as front and rear supporting legs and middle and rear carrying wheels of the bridge girder erection machine are adjusted; the bridge girder erection machine is pushed to move forwards when the weight of the bridge girder erection machine is kept balanced; the front supporting legs of the bridge girder erection machine are moved to a pier cover beam to be erected and stridden at the front position, the rear supporting legs support the top faces of the font ends of the erected box girders, and therefore a hole passing purpose is achieved; and then a girder transporting crane on the bridge girder erection machine is used for lifting the box girders. By the adoption of the construction method, the defects that a crane needs to be repeatedly erected and moved, the construction efficiency is low, and the risk coefficient is high are overcome. A construction period can be guaranteed, normal construction and vehicle passage of a road under a bridge are guaranteed as well, meanwhile, the construction cost is reduced, the safety coefficient is high, social benefits and economic benefits are good, the method is suitable for being applied to urban prefabricated box girder lifting projects and particularly suitable for lifting of the relatively high prefabricated box girders of the bridge over water.