Method for maintaining bearings of crane span structures of cutter suction dredgers

The invention discloses a method for maintaining bearings of crane span structures of cutter suction dredgers. The method comprises the following steps: mounting a bearing maintaining device (4) on anoriginal reamer crane span structure (3), wherein the bearing maintaining device (4) has a cylindrical structure, can support the reamer crane span structure (3) and can serve as a rolling shaft forlongitudinal rolling of the reamer crane span structure (3), the mounting position of the bearing maintaining device (4) is close to a bearing (5), and the bearing maintaining device (4) can stretch out or retract in relative to the reamer crane span structure (3); and calculating the weight of the reamer crane span structure (3), determining the mounting position of the bearing maintaining device(4), calculating the size of the bearing maintaining device (4), mounting a stopping block (9) on a main hull deck (8) as an accurate limiter for the longitudinal rolling distance of the reamer cranespan structure (3) so as to ensure that the bearing (5) can smoothly slip out from a bearing block upwards obliquely at an angle of 30 degrees and to maintain or change the bearing (5). The method for maintaining bearings of crane span structures of cutter suction dredgers has the beneficial effects that when required to be repaired or changed, the bearing does not need to be dragged to a repairsite with the aid of external force or a floating crane, but the bearing can be repaired or changed effectively and rapidly at low cost.