Abstract: At present, the transport and assembly of lined steel pipe in tunnel is characterized by large construction difficulty, low efficiency and low assembly accuracy, which needs prelaid track. Hence, in order to suit the rapiddeveloped pipe laying of longdistance water diversion project, a lined steel pipe transportation and adjustment integrated machine in tunnel is designed based on existing lined steel pipe transportation and assembly technology and the characteristics of Hexi Branch Line project. The machine has the advantages of convenient assembly and disassembly, high construction efficiency, high automation and simple assembling process, which does not need prelaid track. And then the finite element analysis is carried out on the structure of the machine, the key components and the dynamic system of the walking mechanism are analyzed, and internal structure and design scheme of the machine are optimized to ensure reasonable structure and safe and stable operation. The applicable results of the machine to Hexi Branch Line project show that the steel pipe transportation is stable and reliable with high assembly precision, construction efficiency and quality, which can provide a new technical solution for the safety control, quality control, scheme feasibility and cost control of lined steel transportation and adjustment integrated machine production process.

Key words: tunnel, lined steel pipe, lined steel pipe transportation and adjustment integrated machine, transport, assembly, structural design, finite element analysis