The invention relates to a method for assisting a cutter suction dredger to pass through a
narrow channel by a grab dredger. Comprising the following steps that S1, the
stern of the cutter suction dredger is adjusted to face a channel, when the
vertical distance between the center of three cable columns of the
stern and an inlet of the channel is d1, the cutter suction dredger stops moving, a lower steel
pile keeps the position of the dredger, two transverse moving anchors of the bow are thrown, two transverse moving cables are tightened, and anchor braking is completed; s2, the grab dredger slowly gets close to a channel outlet under the assistance of the auxiliary ship, the direction of the grab dredger is adjusted, the body of the grab dredger is transversely arranged at the channel outlet, and when the distance between the
stern of the cutter suction dredger and the side of the grab dredger is L1, the lower steel
pile of the grab dredger is positioned; s3, the cutter suction dredger lifts the steel
pile, a near-side anchor cable
winch of the grab dredger takes up a cable, the cutter suction dredger transversely moves a
winch to synchronously pay off the cable, the cutter suction dredger slowly moves into the channel, and when the distance between the stern of the cutter suction dredger and the ship side of the grab dredger is L2, the grab dredger stops taking up the cable, the cutter suction dredger stops paying off the cable, and the cutter suction dredger descends the steel pile to be positioned; s4, the grab dredger lifts the steel pile, a far-side anchor cable
winch of the grab dredger takes up a cable, a near-side anchor cable is synchronously paid off, the grab dredger slowly gets away from the cutter suction dredger, when the distance between the stern of the cutter suction dredger and the ship side of the grab dredger is L1, the grab dredger stops moving, and the grab dredger is positioned under the steel pile; and S5, repeating the steps S3 and S4. According to the method for assisting the cutter suction dredger in passing through the
narrow channel through the grab dredger, the feasibility and safety of operation when the suction dredger passes through the
narrow channel are improved.