In-place underwater dredging apparatus of the crater sink type

Details In-place underwater dredging apparatus of the crater sink type In-place underwater dredging apparatus of the crater sink type

1985-01-07

1986-03-11

Crowder, Clifford D.

Excavating

Peat excavators

37 66, 405 74, E02B 302, E02F 388

Patent

active

045745013

ABSTRACT:
In-place underwater dredging apparatus for dredging solid material from an underwater area by pumping a mixture of water and solids from the area and discharging the mixture at a remote location to thereby clear and deepen the area. The apparatus includes an upstanding pipe having at its upper end a hydraulically driven pump with a discharge conduit for conducting said mixture to a remote location, auger screws extending generally laterally outwardly from the lower end of said upstanding pipe and delivering material at a selected rate to the upstanding pipe, and a variable speed hydraulic motor connected with and for rotating said auger screws. Thus the percentage of solids to water which is delivered is variable depending on variable conditions and circumstances. The pump draws the mixture from the auger screws and through the upstanding pipe and discharges it at a remote location. The apparatus also includes a dirty water intake pipe for dredge water which fluidizes the material coming from the auger screws and resulting in easier handling by the pump. The apparatus also includes a clean water intake pipe for insuring the system is clean before starting and can be purged after use.

REFERENCES:
patent: 3638432 (1972-02-01), Schoonmaker
patent: 4074535 (1978-02-01), Schoonmaker
patent: 4217212 (1980-08-01), Deal
patent: 4312762 (1982-01-01), Blackburn et al.

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