Stripping type self-walking control device of tunnel internal arc-shaped piece erector

The utility model discloses a spanning type self-walking control device of an assembling machine for arc-shaped pieces in a tunnel, which comprises a walking mechanism, and the walking mechanism is used for longitudinally penetrating into a hollow space of the arc-shaped pieces and automatically walking in the hollow space in a spanning mode. Comprising an auxiliary rack and a main rack, the auxiliary rack can longitudinally move on the main rack in a reciprocating mode, and supporting legs of the auxiliary rack can upwards leave the ground or downwards make contact with the ground; when the supporting legs of the main rack upwards leave the ground, the supporting legs of the auxiliary rack are in contact with the ground to form support; when the supporting legs of the auxiliary rack are in contact with the ground, the main rack is pushed to move forwards in the longitudinal direction; when the supporting legs of the main machine frame make contact with the ground, the auxiliary machine frame is pulled to mov