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 oriented hole construction technique is key in no dig engineering, it decides the success or defeated of no dig engineering.
目前最流行的非开挖铺管技术为导向钻进法，但这种施工法在流砂地层施工时容易发生塌孔。
At present, the most popular trenchless pipeline installation method is guided boring, but in the guided boring cave-in of the borehole wall eternally are encountered in quicksand formation.
目前最流行的非开挖铺管技术为导向钻进法，但这种施工法在流砂地层施工时容易发生塌孔。
At present, the most popular trenchless pipeline installation method is guided boring, but in the guided boring cave-in of the borehole wall eternally are encountered in quicksand formation.
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