Construction Technology of Stepped Hollow Ring Impact Reverse Circulation Drill for Super-long Pile Foundation in Shallow Sea Area
Based on the drilling pile formation technology of weakly weathered granite stratum across Xijiang fault zone of Jinhai Super-large Bridge from Zhuhai City to Zhuhai Airport intercity rail transit project,aimming at 80 #26-#29 piers with a diameter of 3.00 m and a hole depth of 50.00-100.00 m,the drill type selection,platform requirements,supporting equipment,power consumption and cost analysis and comparative study are carried out.The stepped hollow ring impact reverse circulation drill was developed,and structural equipment such as drill bit structure,drill form,slag discharge mode and drilling slag separation sediment box were optimized.The drill has small weight,convenient operation,high hole formation efficiency and stable construction quality,which effectively solved the problem of low efficiency and high risk of conventional percussion drilling in the construction of large-diameter long pile foundation.
shallow sea areacomplex geologylarge-diameter pile foundationselection of equipment typesuper-deepholeformingsafetyeconomy
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