The paper introduced how to solve surface leakage of excavated pile with double protective casing and the better results have been achieved.

本文介绍采用双护筒解决挖孔桩地表水渗漏问题，取得了较好的效果。

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Sutong Bridge located in the tidal reach adopts the pile-group foundation with large-diameter and over-length bored piles working with the steel casing together.

位于潮汐河段的苏通大桥采用大直径、超长钻孔灌注群桩基础，而且需要考虑钢护筒的共同作用。

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