English：

In the process of construction of underground diaphragm wall in water-rich and weak strata, theanti-flow around measures of wall joint are the key to enhance the overall stiffness and anti-seepageperformance of the underground diaphragm wall and improve the construction quality of the wall. Based onthe project of Lüdao Lake Middle Station of Foshan Metro, a new type of anti-flow around water sactechnology is proposed on the basis of traditional anti-flow around measures. The water sac is used to fillthe interior of the I-shaped steel web, block the concrete circulation channel, and provide temporarysupport for the soft soil layer. Compared with the traditional anti-flow around measures, the pouring rateof underground diaphragm wall with anti-flow around water sac technology is significantly improved, andthe construction quality and overall waterproof performance of I-steel joints of underground diaphragm wallare significantly improved.