Design and Practice of Prestressed Concrete Servo Support for Deep Foundation Pit in Soft Soil

Combined with a deep foundation pit in Hongkou District of Shanghai, the application of a prestressed servo control system in deep foundation pit concrete support is introduced. The practical case shows that: The double ring beam combined with the support and jack system can effectively ensure the clear force transmission and deformation coordination of the concrete support system; The servo control technology of prestressed concrete support can significantly eliminate the deformation of the concrete support system, and can effectively control the displacement of foundation pit support structure, to reduce the impact on sensitive protection objects around foundation pit; Dynamic monitoring should be strengthened during the implementation of prestressed concrete support and attention should be paid to the interaction and influence of different support loads, the prestress should be dynamically adjusted according to the monitoring results.