Dismounting structure of shield tunneling machine A ring

The utility model discloses a dismounting structure of an A ring of a shield tunneling machine. COMPRISING A RING, a cutting line is arranged on the ring A; the device further comprises a positioningdevice, the positioning devices are symmetrically arranged on the two sides of the cutting line, the corresponding positioning devices on the two sides of the cutting line are arranged in a stacked mode, the stacked positioning devices are fixedly connected through a detachable structure, a middle plate is arranged between the stacked positioning devices, and a gap is formed between the middle plate and the ring A; according to the utility model, the A ring of the shield tunneling machine is disassembled and repaired in an existing cutting mode; the positions of the cut rings A are quickly positioned through the positioning device, so that the rings A can be welded and repaired, the problem that the rings A of the shield tunneling machine cannot be used repeatedly after being cut is solved, and the manufacturing c