CHANNEL DREDGING METHOD AND DEVICE Russian patent published in 2006 - IPC E02F3/88 

FIELD: dredgers and soil-shifting machines with arrangements acting by a sucking or forcing effect, for instance suction dredgers.

SUBSTANCE: method involves cutting ground with working blades of mechanical cutting tools installed on rotary cutting head, which performs horizontal intermittent movement in both directions transversely to axis of rotation; simultaneously supplying high-velocity high-pressure water jets to area of mechanical cutting tool cooperation with ground to be cut and removing cut ground. Angular dimension α of area in which high-pressure water jets are supplied in horizontal cutting head movement direction is in the following range: where H is depth, D is cutting head diameter. Device for above method realization comprises high-pressure water source installed in basic ship. The water source is provided with rotary drive and mechanisms providing adjusting movement and controlled reverse horizontal displacement. Device also has executive mechanism made as hollow shaft carried by rotary supports on load-bearing frame and provided with cutting head connected to outlet end thereof. The cutting head has mechanical cutting tools and jet-forming nozzle, which are connected to high-pressure water source through water supply channels, rotary pipeline arranged inside hollow shaft, hydraulic puller and non-rotating pipeline. Distribution device body is fixedly connected to inlet end of the hollow shaft. Rotary pipeline has multi-channel part including several channels. Jet-forming nozzles are connected in several groups. Number of groups is equal to number of channels made in the rotary pipeline and each group is attached to outlet of one of the channels. Channel inlets are fastened with distribution device. Multi-channel pipeline part is arranged in body, which compensates hollow shaft curling and is linked to distribution device body by one end and to hollow shaft outlet by another end.

EFFECT: increased operational efficiency.

7 cl, 10 dwg