Method for replacing self-balancing backpressure type bridge single-support

The invention relates to a method for replacing a self-balancing backpressure type bridge single-support. The method mainly comprises the construction steps of leveling, installation and updating of the support, installation of a monitoring device, application of pre-pressure, locking of a jacking supporting device, pouring of a support cushion stone and the like. By means of the method, a new support can not become empty or shift under the effect of a live load in a later period after bearing dead-load pre-pressure, and it is guaranteed that a beam body at the support can not be subjected to forced displacement at the same time, so that generation of additional internal force between a cross bridge and the beam body is avoided, and sufficient emergency capacity is reserved; in the whole construction process of support replacement, operation is easy and convenient, and almost no influence is imposed on structural safety of the bridge; the construction process of single-support replacement is simplified to the maximum extent, construction cost is saved, and extremely high economic benefits are obtained.