孔口管的安设方法有预埋式和后埋式。

Borehole orifice-pipe can be installed using pre-bury or later-bury method.

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三峡工程大坝泄洪深孔孔口数量多、尺寸大，且具有操作频繁、水头高、变幅大等特点。在技术设计阶段，对深孔长、短管方案进行过深入的比选研究。

The bottom release outlets of the Three Gorges dam are characterized by a considerable number of outlets, large size, frequent operation, high water head and great variation in water head, etc.

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