破碎带⁃硬岩复杂地层桩基成孔技术研究与应用  

Research and Application on Pore⁃forming Technology of Pile Foundation in Fractured Zone and Hard Rock Complex Stratum

作　　者：王绅皓 吴亚丽[1] 邱思宇 张振鹏 WANG Shenhao;WU Yali;QIU Siyu;ZHANG Zhenpeng(Beijing Engineering Consultants Co.,Ltd.,Beijing 100038,China)

机构地区：[1]北京市勘察设计研究院有限公司,北京100038

出　　处：《施工技术（中英文）》2024年第13期88-92,共5页Construction Technology

摘　　要：破碎带⁃硬岩地层具有破碎带层岩土体稳定性差,硬岩层强度高的特点。为解决破碎带⁃硬岩复杂地层桩基成孔问题,提出了旋挖引孔、潜孔锤凿岩的分层成孔技术,结合潜孔锤强大的破碎能力,并引入旋挖跟进护筒穿透破碎岩层,充分发挥了各自工艺的优势。以北京市西山南麓大直径桩基础工程为例,阐述了空压机风量、风压以及潜孔锤机械配置、钻进规程以及钻进效率等重要施工参数,总结分析了潜孔锤成孔过程中常见问题及原因,提出了相应的处理办法。旋挖⁃潜孔锤分层成孔技术有效提高了钻进效率和成孔质量,为复杂岩层桩基成孔技术提供一定的理论基础和实践经验。The fracture zone⁃hard rock stratum has the characteristics of poor stability of rock and soil in the fracture zone and high strength of the hard rock stratum.To solve the hole⁃forming problem of pile foundation in complex strata of fracture zone⁃hard rock,this paper proposes a layered hole⁃forming technology of rotary drilling and down⁃the⁃hole hammer drilling,which combines the powerful crushing ability of the down⁃the⁃hole(DTH)hammer and introduces the rotary drilling follow⁃up casing to penetrate the broken rock strata,giving full play to the advantages of their respective processes.Taking the large⁃diameter foundation pile project at the southern foot of the Xishan Mountain in Beijing as an example,this paper expounds on important construction parameters such as air volume and air pressure of the air compressor,mechanical configuration of the DTH hammer,drilling procedure and drilling efficiency,summarizes and analyzes the common problems and causes in the process of DTH hammer drilling,and puts forward corresponding treatment methods.The layered hole⁃forming technology of the rotary drilling⁃DTH hammer effectively improves the drilling efficiency and hole⁃forming quality,and provides a certain theoretical basis and practical experience for the pile foundation hole⁃forming technology in complex rock strata.

关 键 词：桩基础 潜孔锤 旋挖 风压 施工技术 

分 类 号：TU753[建筑科学—建筑技术科学]