Abstract：
Due to the fact that large-diameter bored filling pile has obviously greater pile hole, dregs quantity, specification of reinforced cage and concrete quantity for single pile than ordinary bored filling pile, so the pile body has low stability, its construction and quality control are difficult. During the construction of D34-19 turning branch tower pole foundation bored filling pile with 3400mm pile diameter in the 110kV Qixin-Chenqiao electric transmission line engineering, appropriate drilling machine is used and measures for protection of hole wall, control of bottom hole dregs thickness and underwater concrete pouring are adopted to guarantee successful formation of pile.
