Case Study of Pipe Jacking with Pressure Into Cabin in High Water Pressure Composite Stratum

Abstract

The construction of large-diameter pipe jacking within high water pressure composite stratum is a complex undertaking, fraught with numerous uncertainties. Should driving parameters such as mud tank pressure and torque prove to be abnormal, it may become necessary to consider cabin inspection. In cases where the cabin cannot be opened at normal pressure, operational inspections may be conducted by entering the cabin under pressure. Within the context of the Jiaoliu River pipe jacking section of the sixth bid of the Chuo to Liao water diversion project, the ZTPΦ4400mm mud-water balance pipe jacking machine was utilized. During the construction process, abnormal noise and sudden torque increases were observed within the cabin, rendering the opening of the cabin impossible at normal pressure. In light of these challenges, this paper presents a detailed description of the cabin-opening under pressure construction utilized in this project. This includes a thorough analysis of the key technologies involved, such as the selection of the cabin-opening mode, the working principles of cabin entry under pressure, and preparations before construction. Additionally, this paper provides a comprehensive overview of mud film preparation, mud film establishment, and pipe wall grouting, all of which are essential components of the cabin-opening under pressure construction process. Through a rigorous examination of these critical factors, this paper aims to provide valuable insights into the challenges and best practices associated with large-diameter pipe jacking in high water pressure composite stratum.