以京唐港地区地质条件为模型，对大口径井点降水进行了详细的分析，对大口径井点降水在实际工程应用具有理论参考价值。
Taking the geological condition in the harbour district Jingtang Port as the model, the detail analysis on lowering water level by large diameter well point are given in the paper.
采用沉井法施工大口径水源井可解决施工用淡水的问题。
This problem can be resolved by using submerged well method for constructing big diameter water sources well.
可为大口径地热井和其他水文水井钻探工作借鉴。
These may be served as references for drilling in large geothermal and other hydrographic wells.
宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。
Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.
宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。
The large-diameter gas drainage well laid out in the Xuandong No. 2 Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.
宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。
The large-diameter gas drainage well laid out in the Xuandong No. 2 Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.
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