| 坚硬岩石地层钻孔桩旋挖钻机成孔技术 |
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| 引用本文： | 周外男,缪玉卢. 坚硬岩石地层钻孔桩旋挖钻机成孔技术[J]. 世界桥梁, 2019, 47(4): 27-31 |
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| 作者姓名： | 周外男 缪玉卢 |
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| 作者单位： | 中国中铁大桥局集团有限公司,湖北武汉,430050;中铁大桥局集团第四工程有限公司,江苏南京,210031 |
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| 摘 要： | 新建商合杭铁路芜湖长江公铁大桥主桥为(98+238+588+224+84) m钢箱板桁结合梁高低矮塔斜拉桥。主桥0号边墩和1号辅助墩均为22Ф2.5 m钻孔桩基础,设计桩长42~58m,入岩深度17~28m,岩石最大强度达151MPa,采用旋挖钻机施工成孔。旋挖钻机布置在水上钻孔平台上,钻孔过程中采用优质膨润土化学泥浆护壁。覆盖层中采用截齿钻头全断面钻进;倾斜或软硬交界岩面采用“稳定器+截齿钻头或取芯钻头”钻进1.2~1.5m;坚硬岩层中采用牙轮环切钻头和扩孔钻头按照? 1.5 m→Ф2.0 m→Ф2.5 m分3级钻进成孔。最后采用泵吸反循环清孔。
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| 关 键 词： | 斜拉桥 基础 岩石 钻孔桩 旋挖钻机 分级成孔 施工技术 |
Using Rotary Drilling Rigs to Make Holes for Bored Piles in Hard Rock Strata |
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| ZHOU Wai-nan,MIAO Yu-lu. Using Rotary Drilling Rigs to Make Holes for Bored Piles in Hard Rock Strata[J]. World Bridges, 2019, 47(4): 27-31 |
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| Authors: | ZHOU Wai-nan MIAO Yu-lu |
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| Affiliation: | (China Railway Major Bridge Engineering Group Co. , Ltd. , Wuhan 430050, China;The Fourth Engineering Co. , Ltd. , China Railway Major Bridge Engineering Group, Nanjing 210031, China) |
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| Abstract: | ZHOU Wai-nan;MIAO Yu-lu(China Railway Major Bridge Engineering Group Co. , Ltd. , Wuhan 430050, China;The Fourth Engineering Co. , Ltd. , China Railway Major Bridge Engineering Group, Nanjing 210031, China) |
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| Keywords: | cable-stayed bridge foundation rock bored pile rotary drilling rig step-by-step hole formation construction technique |
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