초록 ▼

The sea sled includes a pair of pontoons mounting depending rollers for straddling a pipeline disposed on the sea bottom. Water jets fluidize the sea bottom to form a trench in which the pipeline settles. The slurry formed by the water jets is removed from the trench by the eductor system which incl

The sea sled includes a pair of pontoons mounting depending rollers for straddling a pipeline disposed on the sea bottom. Water jets fluidize the sea bottom to form a trench in which the pipeline settles. The slurry formed by the water jets is removed from the trench by the eductor system which includes a pair of conduits each having a suction inlet at its lower end for location within the trench, a discharge at its upper end, a pair of pump nozzles each having an inlet external to the associated conduit and an outlet within the conduit directed toward the corresponding discharge, and a pair of primary nozzles respectively spaced from the inlet ends of the pump nozzles. A high pressure, low volume, fluid is pumped from the surface through the jet nozzles. The fluid emanating from the jet nozzles entrains ambient fluid and delivers low pressure, high volume, fluid through the respective pump nozzles to their corresponding discharges. The action of the pump nozzles in the conduits creates a suction whereby the slurry from the trench is pumped from the trench through the conduit and discharged to opposite sides of the trench.

대표청구항 ▼

A device for making a trench in a sea bottom and for removing slurry formed during making such trenches, adapted for use in conjunction with a sled drawn by a vessel and moving on the sea bottom, said device comprising: at least one outlet nozzle with means for supplying high pressure water through

A device for making a trench in a sea bottom and for removing slurry formed during making such trenches, adapted for use in conjunction with a sled drawn by a vessel and moving on the sea bottom, said device comprising: at least one outlet nozzle with means for supplying high pressure water through same by means of a hose from the vessel for production of a trench by swilling: at least one suction tube having associated therewith a jet pump operated also from the same high pressure water supply used to displace slurry made up of spoil mixed with water; said jet pump comprising two nozzles which are arranged substantially coaxially in tandem with an adjustable spacing between the nozzles providing a free intermediate space which is in communication with surrounding water in trenching operation, the forward of these nozzles being introduced from the side of such suction tube into the same substantially coaxially at a bent portion of the suction tube.