In order to reduce manufacturing progress, a measure how to cut inward oriented hole is introduced.
还介绍了一种线切割内导柱孔方法，减少了制造过程中的一些环节。
The oriented hole construction technique is key in no dig engineering, it decides the success or defeated of no dig engineering.
导向孔的施工是非开挖施工的关键，它决定着非开挖的成功与否。
The construction of oriented hole, seepage prevention wall, and checking hole are introduced, briefly concerning about the special instance.
文中介绍先导孔、防渗墙、检查孔的施工，并就在施工遇到的特殊情况进行了简要性论述。
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