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In order to comply with the local economic development and reduce the project investment, the UHV line projects are mostly along the hilly areas, and the mountainous areas are mostly difficult to construct. At the same time, the mountainous environment is complex, the traffic is inconvenient, and it is difficult for large machinery to transport to the operation site, which makes the construction of UHV line foundation pile less mechanized, and has always relied on manpower and small tools. With the large-scale development of power grid construction, the problems of labor intensity, poor operation safety and low construction efficiency caused by relying on human construction are increasingly apparent. In view of this kind of problem, the micro pile drilling machine realizes the mechanized construction of micro pile foundation in UHV transmission line project through modular design scheme. Micro pile foundation is a new type of light foundation pile foundation (pile diameter is generally 300-400mm) specially designed for mountainous UHV transmission line engineering. It has the advantages of small pile diameter, small working surface, small hole digging torque, high bearing capacity, and small excavation volume, which is conducive to environmental protection. It is a special equipment suitable for the construction of micro pile foundation under complex mountain conditions.

Design and Research of Micro Pile Drilling Rig for UHV Transmission Line in Mountainous Area