Research on Typical Design Scheme for Mechanized Construction of 220 kV Overhead Transmission Line Foundation

The level of mechanization of overhead transmission lines is an important symbol of modern power construction. Good design and planning of road construction and typical planning of construction foundation can minimize the disturbance of mechanical equipment to the foundation and reduce the impact on the environment, and improving the reliability of soil and water conservation measures. Based on the sorting of commonly used mechanical construction foundation types in mountainous areas, through equipment research, this paper discuss the typical schemes for temporary road on plain area, coastal area, river area and mountain area, and use the typical design on tower site with different equipment to optimise the arrangement of construction and quantitative evaluation on excavation. The results show that: (1) the scheme of plain area are wooden boards and old tires, the scheme of coastal areas and river area are filling and temporary steel trestle, the scheme of mountain area are expand the original road and excavating new road. (2) The excavation quantity of rock anchor foundation with slope ≤10° is the less than that of pile foundation and micro pile foundation, The excavation quantity of split equipment is less than integral equipment because of the requirement of the road width. (3) the slope is an important factor to the excavation quantity, the excavation quantity of rock anchor foundation with slope 25° is 2.33 times than that on slope 10°. The amount of earthwork on the tower site increases by 2.33 times with slope 25° of split equipment on pile and micro pile foundation.