| 摘要 |
An improved method for dredging by means of a pair of spuds provided on the respective sides of the stern of a dredger and adapted to be alternately driven into the bottom of the water, a ladder projected from the bow portion of the dredger and a suction port member that is mounted at the extreme end portion of the ladder. The improvements are in the repetitive cycles of operation, each consisting of the steps of at first dredging while the suction port member is successively retracted from the foremost position of its stroke to the rearmost position as the ladder is swinging from one side towards the other about the spud on the other side, then driving the spud on the one side and retracting of the spud on the other side, advancing the suction port member to the middle position in its stroke, thereafter dredging as the ladder is swinging towards the one side, then advancing the suction port member to the foremost position of its stroke, and thereafter again dredging as the ladder is swinging from one side towards the other side. Preferable structures of a dredging apparatus to be used in the above method are also disclosed.
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