Wave-shaped arc sheet pile assembly for foundation pit supporting system

The utility model discloses a wave-shaped arc sheet pile assembly for a foundation pit supporting system, which comprises a main sheet pile and a secondary sheet pile which are connected with each other to form an annular structure. U-shaped bending parts are arranged at the two ends of each main plate pile, every two adjacent main plate piles are connected together in a clamped mode through the corresponding U-shaped bending part, and the adjacent main plate piles and the secondary plate piles are connected together in a clamped mode through the corresponding U-shaped bending parts. A clamping column is arranged at the tail of each U-shaped bent part, a clamping groove is formed in a U-shaped groove of each U-shaped bent part, and when the two U-shaped bent parts are clamped together, the clamping columns are clamped into the clamping grooves to form a self-locking fastening structure. During construction, only the clamping column between the two U-shaped bending parts needs to be clamped into the clamping g