我国以往电厂工程盾构隧道直径大多数是4 000 mm左 右，而三门核电厂取水工程采用的自流引水管盾构隧道内径 达6 200 mm，在我国核电厂取水工程中尚属首次应用。分析 了取水构筑物工程地质条件，对工程盾构法隧道设计和施工 工艺进行了介绍，为今后类似工程提供借鉴。

The diameters of most of shield tunnels in power plants of China are about 4 000 mm, while that of artesian water diversion shield tunnel, applied firstly in China, is up to 6 000 mm in Sanmen Nuclear Power Plant. In this paper, the geological conditions of water intake project is analyzed, and engineering design and construction technology of shield tunnel are introduced, providing reference for future similar projects.