DRILLING TECHNOLOGY OF MORE THAN 100 METERS DEEP CAST-IN-PLACE PILE FOR CABLE-STAYED BRIDGE IN COMPLEX STRATA
The traditional drilling methods for cast-in-place piles include impact drilling,grabbing drilling,forward and reverse circulation drilling,and rotary drilling.The terrain adaptability of impact drilling is good,and it can meet various geological conditions such as pebbles,gravel,block stones,bedrock,etc.It can handle drilling construction of isolated stones or isolated stone groups well.However,according to local policies and regulations,the construction of bridge pile foundations near water source riverbanks is prohibited from using construction tech-niques with high vibration such as impact and hammering,so the difficulty of drilling for cast-in-place piles of this bridge increases.Based on engineering practice,a drilling construction technology for over 100 meters deep cast-in-place piles in complex strata cable-stayed bridges is proposed.The construction process and operation points are summarized,and the goal of drilling over 100 meters deep cast-in-place piles in complex strata is ultimately achieved.
complex formationcable-stayed bridgecast-in-place piledrill a hole
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