Abstract
With the development of transportation in major cities across China, the proportion of large-scale highway tunnel construction within urban underground rail transit organizational systems has gradually increased. Highway tunnels constructed using large-diameter shield tunneling methods are characterized by numerous critical difficulties, extended construction periods, high costs, and substantial risks. When large-diameter shield machines are received within a working shaft for subsequent re-launching, conventional practice has typically involved dismantling the shield machine and disassembling the trailing gantries to accomplish station passage, which is both time-consuming and labor-intensive. This paper presents a case study of the successful passage of the shield machine for the highway tunnel of Section VⅢ of the Shanghai North Horizontal Passage New Construction Project through the Yangshupu Port working shaft. By integrating the secondary structural construction of the working shaft and adopting an innovative approach combining permanent and temporary structures, the shield machine and its trailing gantries were pushed through the working shaft as an integral unit. The paper elaborates on the relevant techniques employed in shield machine station passage and discusses aspects such as construction duration, aiming to provide valuable reference for similar projects.
Full Text
Key Technical Measures for Super Large-Diameter Slurry Shield Tunneling through Stations
Dai Cunshan¹
¹Shanghai Tunnel Engineering Co., Ltd., Shanghai 200000, China
Abstract
With the rapid development of urban transportation systems across China, large-diameter highway tunnels have become increasingly prevalent in underground rail transit networks. However, such projects are characterized by numerous technical challenges, extended construction periods, high costs, and significant risks. Conventionally, when large-diameter slurry shields need to pass through working shafts, the shield machine and its trailing gear must be disassembled and reassembled—a process that is both time-consuming and labor-intensive. This paper presents a case study of the Shanghai North Cross Passage New Construction Project (Section VⅢ), where a super large-diameter slurry shield successfully passed through the Yangshupu Port working shaft. By integrating permanent and temporary structural elements, an innovative approach was implemented to push the entire shield machine and its trailing gear through the working shaft as a single unit. The paper details the associated construction techniques, implementation procedures, and project timeline, offering valuable insights and reference points for similar future engineering projects.
Keywords: integral pushing through station; permanent-temporary combination; construction measures