Lightweight drifting type bridge deck crane frame body and assembling method thereof

The invention discloses a lightweight drifting type bridge deck crane frame body and an assembling method thereof, and relates to the field of cranes. The light-weight roadway-penetrating type bridge deck crane frame body comprises two rails arranged in parallel, a base, a supporting frame connected with the top of the base and a frame connected with the top of the supporting frame. The base comprises two base main longitudinal beams arranged in parallel and at least one base cross beam connected with the two base main longitudinal beams. The bottom of the base is connected with a plurality of telescopic supporting mechanisms. The rack comprises two truss type main beams, a front cross beam and a rear cross beam, wherein the two ends of the front cross beam and the rear cross beam are connected with the two truss type main beams. The supporting frame comprises a pair of rear stand columns, a pair of diagonal bracing web frames, a pair of front stand columns and a pair of front diagonal bracing frames which ar