Deduced from caisson method, this article puts forward, a new method of constructing underground pipe in densely built area the Sinking Trough method.

为解决在建筑密集地区修筑地下管道的问题 ，受“沉井法”的启发 ，提出一种新的施工方法——“沉槽法”。

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The paper compares the methods dealing with water leakage from trough bottom of water-sealed gasholder, and introduces the construction way and effect of excavation method.

对湿式燃气储气罐水槽底板漏水的处理方法进行了比较，介绍了挖掘法的施工方法和效果。

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During programming for the trough and cavity, programming of arc method is used for some typical positions of trough and cavity to improve the machining precision.

在编制槽和型腔加工数控程序的过程中，针对槽和型腔的典型部位采用趋近圆弧的编程方法进行编程，提高加工精度。

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