Rigidity-variable foundation pit support system with interphase locking H-shaped steel and U-shaped sheet piles

The utility model relates to a rigidity-variable foundation pit support system with interphase locking H-shaped steel and U-shaped sheet piles, which comprises a plurality of pieces of locking H-shaped steel, and a plurality of U-shaped sheet piles are connected between two adjacent pieces of locking H-shaped steel; the locking opening H-shaped steel comprises an H-shaped steel body, first locking openings are formed in the two sides of a web of the H-shaped steel body, and the first locking openings are in bilateral symmetry about the web. The U-shaped plate pile comprises a U-shaped steel plate, second locking openings are formed in the two ends of the U-shaped steel plate, and the second locking openings of the U-shaped steel plate are in butt joint with the first locking openings of the corresponding locking opening H-shaped steel or in butt joint with the second locking openings of the adjacent U-shaped steel plate. According to the utility model, the problem that the Lassen steel sheet pile supporting f