Abstract: To monitor displacement of the concrete double-curvature arch dam, 10 vertical lines and 8 inverted vertical lines were laid. Later, corrosion of the inverted vertical lines happened because of quality problems. 8 inverted vertical lines were replaced. Technical measures and construction experience were described in this paper for reference to similar projects.

摘要： 为监测二滩混凝土双曲拱坝水平位移变化情况，布置了10 条正垂线和8 条倒垂线。后由于垂线线体锈蚀，对所有垂线线体都进行了更换。本文主要介绍倒垂线体更换的主要技术措施和施工经验，为其它大坝的倒垂线体更换提供参考。