DREDGING DEVICE FOR MANHOLE OF GREAT DEPTH

摘要

PROBLEM TO BE SOLVED: To provide a dredging device for a manhole, making an elevating post extensible further in multiple stages while maintaining slenderness to cope with the great depth of a manhole and reducing the height of a ground part for supporting and guiding the elevating post. SOLUTION: A dredging device for a manhole of great depth comprises a turning frame part 1 derrickingly fitted onto an underframe of a vehicle; an elevating guide part 2 mounted to the turning frame part 1 and provided with twin ascending and descending frames ascending and descending independently; an elevating post part 3 gripped by the elevating guide part 2 and put in expanding/contracting action and a dredging busket part 4 mounted to the lower end of the elevting post part 3. The descending frame is provided with a movable clamp 40 vertically moved interlocked with the descending frame. The elevating post part is extensible in three or more stages. A hydraulic cylinder is disposed between a first stage post and a second stage post, and expansion mechanism comprising a sheave and a wire is disposed between the respective posts.