White Horse Ridge Viaduct External Prestressing

The bridge construction development is connected with the bridge structure and the new material development. Along with anticorrosion technology progressing by leaps and bounds, the technology of external prestressed concrete (EPC) was eagerly anticipating the new turn application by its clear technical characteristic. External prestressed concrete technology full display through removable and re-stressed, will impel the bridge structure the big development, to will study the new bridge structure, the great span bridge structure has the enormous direction function. Develops external prestressed bridge the design and the construction engineering research, may use external prestressed for the similar bridge to provide the model, to impels the newly built bridge technology and the old bridge reinforcement technology development all has the profound significance. In the reading massive science and technology literature foundation, the main research work includes:(1) the external prestressed structure concept and the system were discussed, the development history and the present situation were also discuussed; the external prestressed bridge the stress characteristic and the method of calculation were analyzed, the external prestressed system composition and the main construction craft was introduced, the external prestressed realization process and the technical key point were summarized.(2) according to the design of the internal pre-stressed mixed with the external prestressed system, according to the structure different stage mechanics characteristic value determined in internal prestressed and external prestressed quantity, declare about that the internal prestressed mainly guarantee beam the intensity and the rigidity in the construction period, external prestressed satisfies the intensity and the rigidity request through the whole operation period. Contrast on the function between the internal prestressed and the external prestressed, for later similar bridge design accumulation experience.(3) based on the erection of T-beam, between the gantry crane and the bridging machine—the two construction organization way,to carry on the contrast, and to installed the plan according to the contrast result to carry on the optimized choice. How on guaranteed the structure security, enhances the efficient two aspects to carry on analyzes and suggested.(4) based on the control situation of the external prestressed on BaiMaLong viaduct, from erects, integrates, external prestressed infliction,to integrated examines and so on, launches external prestressed bridge construction research, will hope for the later similar bridge construction accumulation experience. (5) through the moving load experiment, the structure in the experimental load temporary lodging in the elasticity active status, indicated the design method of external prestressed, the job practice are feasible, the external prestressed technology of BaiMaLong viaduct has the obvious economic efficiency.