Construction Technology of Mechanical Punching Piles in Folded and Reverse Deep Zones
In traditional bridge engineering pile foundation construction,mechanical drilling pile method is often used for large-diameter deep hole piles.The reverse deep fault zone in Honghe Prefecture,Yunnan Province is characterized by the interweaving of folds and faults.This geological formation occurred late,with a complex geological structure and a height difference of up to 440m in geographical environment.Under the above conditions,conventional deep hole pile punching construction methods are difficult to achieve.Taking the pile foundation engineering of the civil engineering project of the Yuanjiang to Manhua Expressway as the background,this paper summarizes the construction technology of mechanical drilling piles for 25～40m deep holes in folded and reverse depth sections.The main aspects are detailed from the technical characteristics,process principles,construction process flow and operation points,materials and equipment,and quality control.
NETL
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