Application of XCMG XR580HD and XR400E Rotary Drilling Rigs in Super-long Pile Foundation of Hard Mudstone
The exposed stratum of No.16 main pier pile foundation project of Huoxianggou Bridge in Qingyang transit section of G244 line is Quaternary aeolian loess with ancient soil,underlying Cretaceous mudstone.The silty clay layer in the loess geology of the upper part of the pile body is easy to collapse.In addition,the compressive strength of the lower mudstone layer is large,which has many difficulties such as large number of pile foundations,deep pile length,large pore size,complex geology,difficult hole forming and tight construction period.According to the technical analysis,Xugong XR580 HD and XR400 E rotary drilling rigs were selected for hole forming,and good results were achieved.On this basis,the main construction technologies of large-diameter super-long pile foundation under the above adverse conditions are summarized,aiming to provide reference for the rotary drilling hole construction of the mudstone layer at the bottom of super-long pile foundation in loess area in the future.
rotary drilling righard mudstonesuper-long pile foundationcretaceous mudstonerotary drilling into holescomposite drill bitrelay sleeve play