multi hole directional drilling 多开眼定向钻井 directional drilling machine 定向钻机 directional drilling crossing method 定向钻穿越法 ..
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The proposed approach was applied in the product development of horizontal directional drilling machine and its feasibility was verified.
最后给出了水平定向钻机完整产品总体设计方案的配置实例，并验证了所提方法的可行性。
The basic work principle and equipment composition of non-excavation technique of directional drilling machine have been introduced in this paper.
介绍了采用定向钻非开挖技术的基本工作原理与设备组成。
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