Bridge cantilevered casting hanging basket controllable equivalent pre-load testing method

The invention discloses a bridge cantilevered casting hanging basket controllable equivalent pre-load testing method. The bridge cantilevered casting hanging basket controllable equivalent pre-load testing method comprises the following steps that 1, at least one anchor device is arranged at the two horizontal ends of the top face of a bridge bearing platform symmetrically in the bridge direction and in the longitudinal direction, center hole jacks are symmetrically installed on hanging baskets at the two sides of a main girder, a telescopic end of each center hole jack is connected with the corresponding anchor device through a steel strand, and each steel strand is tensed through the corresponding center hole jack; 2, the center hole jacks on hanging baskets at the two sides increase synchronously step by step, and a load deformation value is measured; 3, after no continuous deformation development of the hanging baskets is observed, unloading is conducted step by step, and the unloading deformation value is measured. The bridge cantilevered casting hanging basket controllable equivalent pre-load testing method adopts the center hole jack to tense the steel strand to exert pressure, the load is equivalent and controllable, the data are more real and reliable, meanwhile, the pre-pressing precision is improved, the testing cost is reduced, and the testing time is shortened.