| 岩溶地层超长钻孔桩护筒跟进成孔施工技术 |
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| 引用本文： | 牛慧敏.岩溶地层超长钻孔桩护筒跟进成孔施工技术[J].国防交通工程与技术,2013(6):62-64,3. |
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| 作者姓名： | 牛慧敏 |
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| 作者单位： | 中铁十二局集团有限公司,山西太原030024 |
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| 摘 要： | 岩溶地区桩基施工面临成孔难、易漏浆、常塌孔等技术难题，结合贵广铁路大塘口双线特大桥岩溶区超长钻孔桩基的施工，介绍了采用多层钢套筒跟进．抛投片石、黏土、水泥封堵小洞和混凝土封堵大洞等方法，成功解决各项技术难题，保证了桩基的成孔质量，为类似地区桩基施工提供了可借鉴经验。
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| 关 键 词： | 岩溶地层 超长钻孔桩 钢护筒 |
Construction Techniques for the Casing-Followed Hole-Shaping Operation for Super-Long Bored Piles in the Karst Stratum |
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| Niu Huimin.Construction Techniques for the Casing-Followed Hole-Shaping Operation for Super-Long Bored Piles in the Karst Stratum[J].Traffic Engineering and Technology for National Defence,2013(6):62-64,3. |
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| Authors: | Niu Huimin |
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| Institution: | Niu Huimin (The 12th Bureau Group Co. lad. of the Zhongtie Corporation of China,Taiyuan 030024,China) |
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| Abstract: | The construction of pile foundation in the karst stratum is often faced with the technical problems of being difficult in hole-shaping, being liable to mortar leakage, and frequently collapsing of bored holes. With the construction ot the foundation of super long bored piles for the Datangkou Dual-line Mega Bridge in the karst stratum of the Gui-Guang Railway as a practical ex- ample,introduced in the paper are the techniques of the muhi-layer-steel-casingfollowing drilling,casting rugstones, clay and cement to fill up small holes and pouring concrete to block big holes,etc. ,all of which help success- fully solve the various technical problems faced in the construction and ensure the quality of the bored holes. The paper may provides valuable experience for the construction of other pile-foundation projects in similar areas. |
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| Keywords: | Karst formations super-long bored pile steel guard casing |
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