Abstract: The surrounding concrete of steel spiral case in the power station of Three Gorges Project(TGP) is constructed by means of keeping aspecific level of internal pressure during construction.

• 摘要： 防渗墙墙体槽段的连接部位是防渗墙防渗的薄弱环节，其连接质量是保证防渗墙整体防渗效果的关键，决定着防渗墙的成败。