| 伊朗库姆大桥大口径基桩孔钻进工艺 |
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| 引用本文： | 曾铁军.伊朗库姆大桥大口径基桩孔钻进工艺[J].煤田地质与勘探,1996,24(4):59-61. |
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| 作者姓名： | 曾铁军 |
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| 作者单位： | 中国煤田地质总局１２９队 |
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| 摘 要： | 介绍了在伊朗库姆大桥工地利用泵吸反循环冲洗一次成孔工艺，施工大口径基桩孔的技术问题，包括埋设护筒、移机定位、对鱼尾导向和燕尾导向刮刀钻头镶焊角度的改进和变换泵轴密封材料等，提高了成孔效率和质量。
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| 关 键 词： | 大井径井，反循环钻进，钻进速度 |
DRILLING TECHNIQUES OF LARGE DIAMETER HOLES FOR THE FOUNDATION PILES OF QOM BRIDGE IN IRAN |
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| Zeng Tiejun.DRILLING TECHNIQUES OF LARGE DIAMETER HOLES FOR THE FOUNDATION PILES OF QOM BRIDGE IN IRAN[J].Coal Geology & Exploration,1996,24(4):59-61. |
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| Authors: | Zeng Tiejun |
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| Abstract: | he author introduced a successful experience of reverse circulation drilling with pumping in Iran. The technical problems in construction of large diameter holes were solved,including the covering of muff,shifting and positioning of the drilling rig,improving of the welding angles of the fishtailed and swallowtailed drag bits and the exchange of sealing materials of pumps etc.. The construction of the foundation piles of Qom Bridge reached a good result with high efficiency and fine quality. |
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| Keywords: | big hloe reverse circulation drilling drilling rate |
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