trench layering meaning in Chinese

开沟压条法

This paper depicts the engineering outline of the pipeline crossing project as well as a series of new construction methods such as integral pipeline prefabrication , trenching layer by layer , integral lowering pipeline into trench and integral pressure testing , which speed up the construction progress and reduce the construction cost
文章介绍了穿越段的工程概况以及管道整体预制、管沟分层开挖、管道整体下沟和整体试压等一系列新的施工方法，该方法加快了施工进度，节约了施工费用。