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二滩水电站拱坝泄洪中孔出口弧形工作闸门支承结构的预应力锚索由直线形改为环形，锚索穿过预埋在坝体内的环形护管安装，达到了不削弱坝体结构，又使其周围应力趋于均匀的目的。但锚索长度增加１倍以上，单束长达７４ｍ，且为环形，施工难度大。为此，在设计与施工技术上进行了一系列开拓性的工作以保证工程质量，现已完成６个中孔的７２束环形预应力锚索的施工。
The prestressed anchor cable for the supporting structure of the discharge gate of Ertan hydropower station flood discharge center is changed from linear to annular shape and the anchor cable is installed through the annular protective pipe embedded in the dam body so as to achieve the purpose of not weakening the dam structure, Also make its stress around the uniform purpose. However, the length of the anchor cable more than doubled, a single bundle up to 74m, and the ring, construction difficult. To this end, a series of pioneering work on design and construction technology has been carried out to ensure the quality of the project. Construction of 72 ring-shaped prestressed anchorage cables with 6 mesoposses has been completed.