Auxiliary device for monitoring section deformation of U-shaped steel sheet pile

The utility model provides an auxiliary device for monitoring section deformation of a U-shaped steel sheet pile, and belongs to the technical field of deformation tests of foundations or foundation components. Comprising a U-shaped steel sheet pile, a first fixing semi-ring, a second fixing semi-ring, a first fixed pulley, a second fixed pulley, a first supporting steel frame, a second supporting steel frame, a steel sheet platform, an automatic alarm device and a steel wire rope. The fixed semi-ring and the fixed pulley are respectively welded on two sides of the steel sheet pile and a web, and the distances from the fixed semi-ring and the fixed pulley to the corner of the U-shaped steel sheet pile are equal; the supporting steel frames are horizontally and symmetrically welded on a web plate of the steel sheet pile; the steel plate platform is welded on the two supporting steel frames; the automatic alarm device is pasted on the steel plate platform through super glue. The steel wire rope penetrates throu