Abstract: The adaptability challenges and various geologies are often encountered during longdistance pipe jacking in complex geology. As a result, the geological adaptability of pipe jacking machine is improved and the safe and efficient jacking process is guaranteed by reforming the internal structure and improving the jacking equipment system of pipe jacking machine. Based on Shenzhen 110 kV overhead line transformation into ground cable tunnel project, the key points and difficulties in the process of reforming and assembling of open pipe jacking machine are analyzed; and the technical method of using open pipe jacking machine to pass through part of granite strata first, then reforming the power system and the cutterhead diameter of the pipe jacking machine to form a slurry balanced pipe jacking machine, and assembling the pipe jacking machine in tunnel to pass through the subsequent gravel clayey soil layer is proposed. By analyzing and studying the applicability of the power system and the feasibility of cutterhead diameter expansion, the cutterhead disassembly, the transportation of cutterhead and power system in tunnel, the modified tunnel expansion and the machine assembly in tunnel, a suit of complete and reliable pipe jacking machine transformation, assembling and construction technology in tunnel with good applicable effect is formed.

Key words: open pipe jacking machine, slurry balanced pipe jacking machine, disassembly and transformation, assembly in tunnel, continuous jacking