Main machine shield body of assembly type shell-discarding disintegration shield tunneling machine and assembly and disassembly method of main machine shield body

The invention discloses a main machine shield body of an assembly type shell-discarding disintegration shield tunneling machine and a mounting and dismounting method thereof.The main machine shield body of the shield tunneling machine comprises a front shield, a middle shield and a tail shield which are fixedly connected, the front shield is composed of a front shield outer shield body and a front shield inner shield body, the front portion of the front shield inner shield body is fixed to the front shield outer shield body, and the middle shield is composed of a middle shield outer shield body and a middle shield inner shield body; the rear portion of the middle shield inner shield body is fixed to the middle shield outer shield body, the tail shield comprises a tail shield body, a *-shaped beam and a *-shaped beam outer partition plate are arranged at the combination portion of the middle shield and the tail shield, the front portion of the annular *-shaped beam outer partition plate is embedded in a middle