About the author:

1. China Railway 14th Bureau Group Co., Ltd., Jinan, Shandong 250101, China;2. Beijing Urban & Rural Construction Group Co., Ltd., Beijing 100067, China

Abstract:

The pouring period of reinforced concrete supports in deep foundation excavtion is long.Reinforced concrete support is difficult to break and cannot be reused. Steel supports are prone todetachment and have poor structural integrity. Based on the foundation excavtion project of a subwaystation, a modular steel support system structure with axial tension compression bi,directional stressperformance and reusability is proposed from the perspectives of design rationality and practicalapplication. The supporting structure includes flexible ends, connectors, and high wall bolts. This paperanalyzed the stress characteristics and component node connection methods of prefabricated steelsupports, and elaborated on on,site installation and construction techniques. Through engineeringapplication, the first prefabricated steel support is stable with a maximum axial force of -1451.4kN.During the excavation of the first layer of soil in the deep foundation excavtion, the maximum settlementof the adjacent surface is about 5.5mm, and the overall stability is good,which verifies the effectivenessof this construction method.