Deformation Control Method for Cross-steel Joints of the Diaphragm Wall in Super Deep Foundation Pits

Taking the construction of diaphragm walls in the super deep foundation pit group at East Railway Station of Hangzhou Metro Line 6 Phase II as the example, this paper summarizes and analyzes the types and causes of the deformation of the cross-steel joints of the diaphragm wall, and introduces the comprehensive deformation control method composed of adding diagonal bars to the steel plate joints, welded reinforcing the longitudinal steel plate joints and optimizing the backfill materials outside the steel plate joint. The effectiveness of the method is verified by the field practice, providing important reference value for the design and construction of steel reinforcement cages of similar diaphragm walls in the super deep foundation pits in China.