Research on Key Construction Techniques for Extra Long Piles in Collapsible Loess Regions
Based on the 100-meter super-long pile project of Yuhuangge No.2 Bridge and Approach Line Project in Tongchuan City,Shaanxi Province,various hole-forming methods and drilling rigs are compared and selected.The construction technology of the rotary drilling hole-forming method and the XCMG XR800E rotary drilling rig were selected to complete the construction of 100-meter super-long piles.The key technical points and quality control measures of 100-meter super-long piles were introduced,and the reliability of the super-long pile construction was guaranteed from the aspects of pretreatment before drilling,comprehensive treatment during drilling,and reinforcement cage construction control measures.The bearing capacity and settlement characteristics of the 100-meter super-long pile in the collapsible loess site were determined through the test pile.The key links,such as drilling parameters of the soil layer,mud circulation system,sediment thickness,safety and stability checking of the steel cage,and underwater concrete pouring,were strictly controlled during the construction process,which provides a solution for the construction of 100-meter super-long piles in similar collapsible loess areas.
万方数据
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