Fabricated annular supporting structure for deep foundation pit supporting

The utility model relates to the technical field of geotechnical engineering foundation pit supporting, in particular to an assembly type annular supporting structure for deep foundation pit supporting, which comprises an assembly type crown beam, four wide steel members and arc-shaped steel members, an arc-shaped steel member is arranged between each wide steel member and the fabricated crown beam, tenons are fixed to the middles of the arc-shaped steel members, the wide steel members jointly form a nearly-circular structure, an acting point can be provided for deep foundation pit supporting, and if the annular supporting structure is not arranged at the ground position, the tenons are fixed to the middle of the arc-shaped steel members. The device can also be arranged at the waist or other height positions of the deep foundation pit concrete column according to actual conditions; the assembly type crown beam can be disassembled into the cross beams and the longitudinal beams, the cross beams and the longitu