旋挖钻机在岩溶地区干作业成孔方法与质量控制
投稿时间:2019-04-08  修订日期:2019-12-15  点此下载全文
引用本文:刘勇,李翠芝.旋挖钻机在岩溶地区干作业成孔方法与质量控制[J].探矿工程(岩土钻掘工程),2020,47(1):81-85.
LIU Yong,LI Cuizhi. Dry rotary borehole drilling and quality control in the karst area[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2020,47(1):81-85.
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作者单位E-mail
刘勇 中基发展建设工程有限责任公司 liuyong@solibase.com 
李翠芝 中基发展建设工程有限责任公司  
中文摘要:在沪昆铁路盘州站桩基施工中,采用旋挖钻机干作业成孔,成孔过程中近1/3的桩基遇到了溶洞。通过分析不同病害情况,针对在岩溶地层施工中遇到的无充填和半充填溶洞地质条件,分别采取了土石回填筑壁、反转复压,素混凝土挤扩成孔、分段成型,钢护筒护壁、挡截桩混凝土,斜岩找平、重新钻进,定位回填、水泥固化等技术措施,完成了桩基的施工任务。
中文关键词:岩溶地区  溶洞  旋挖钻机  桩基  干作业成孔
 
Dry rotary borehole drilling and quality control in the karst area
Abstract:In the construction of pile foundation at the Panzhou Station of the Shanghai-Kunming Railway, the rotary drill rig was used to dry-drill the holes, and dissolved caves were encountered in drilling of nearly 1/3 the foundation piles. Based on the analysis of different adverse situations, and according to the geological conditions of unfilled and semi-filled karst caves encountered, specific technical measures were adopted, including wall construction by backfilling soil and stone and compaction by reverse rotation, sinking boreholes section by section by squeezing plain concrete, protection of borehole walls and retaining of pile concrete with casing, leveling of uneven rock surface and re-drilling, point-backfilling and cementation; as a result, the pile foundation was successfully completed.
keywords:karst area  karst cave  rotary drill dig  pile foundation  dry-drill hole
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