Steel bar magnetic attraction feeding device and method in tunnel construction

The invention relates to the technical field of building construction, and discloses a steel bar magnetic attraction feeding device and method in tunnel construction. The technical problems that in the prior art, positioning and moving to the steel bar position cannot be achieved, manual assistance is needed, the working efficiency is low, and mechanical construction noise is large are solved. The device comprises a stand column, a longitudinal cross beam and a transverse navigation frame, the transverse navigation frame comprises a transverse cross beam, a longitudinal trolley and a transverse trolley, the transverse trolley is connected with material dragging mechanical arms, the lower portion of one material dragging mechanical arm is connected with a magnetic attraction assembly, the lower portion of the other material dragging mechanical arm is connected with auxiliary grippers, and the auxiliary grippers are distributed on the two sides of the magnetic attraction assembly. Full automation of steel bar f