Excavating – Peat excavators
Patent
1988-08-09
1990-06-12
Massie, IV, Jerome W.
Excavating
Peat excavators
37 75, 7386423, 299 8, 4152111, E02F 388
Patent
active
049321447
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of excavating and sampling materials under any depth of water utilizing a machine capable of generating and directing a water column.
BACKGROUND OF THE INVENTION
Present methods of underwater excavation using a water column rely on diverting the water flow from a ship's propeller, vertically downwards through a tube and washing a crater in the river, lake or seabed. This system cannot be used to sample the washed out materials or outside shallow water or where access for the ship is not possible. The present invention concerns an excavation machine that can be deployed remotely from a ship or other vehicle in any depth of water and having an additional capability of sampling washed out materials.
SUMMARY OF THE INVENTION
According to the present invention there is provided a cylindrical tube through which a water column is generated by means of either a propeller or multiple venturi pipes. A water intake is fitted to the top of the tube in such a configuration as to enable the suction from the intake to oppose the thrust from the outlet thereby stabilizing the machine while in operation. When in the propeller mode, vertical vanes 11 in the water outlet act to prevent the swirling motion of the water column normally produced by a propeller so that a laminar flow of water is produced, and small deflectors can be fitted at the bottom of the vanes to oppose the torque developed by the propeller and assist preventing the machine from rotating. An anchor leg extending from the base of the machine is used to keep the machine at a fixed distance from the surface on which it is operating. Fins attached to the base of the anchor leg by sinking into the ground assist in maintaining the machine in position and when in the propeller mode also prevent the machine from rotating. Filter baskets can be attached to these fins to sample materials washed out during excavation. A buoyancy tank on top of the machine maintains the machine in an upright position. A lifting eye can be incorporated for ease of deployment and the machine can be constructed in such a way as to be easily dismantlable.
BRIEF DESCRIPTION OF THE DRAWING
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in FIG. 1, which is generally a perspective view of an excavator constructed in accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, when power is received by a motor 1, such as an hydraulic motor, from a power source via an umbilical connection 2, a propeller 3 is set in motion, water is drawn in through a water intake 4, then through a cylindrical tube 5 and expelled as a water column at a water outlet 6. The suction force developed at the water intake helps to oppose the thrust developed at the water outlet by the water column and keeps the machine in contact with the seabed 7. The speed of the propeller and thereby the velocity of the water column jet can be controlled from the surface using a valve set in the umbilical. It is thereby possible at an illustrative velocity of say five meters per second for the water column to be sufficiently powerful to mobilize and displace solid materials such as sand, gravel, pebbles and rocks from underneath the invention to a radius of at least two meters. As excavation continues a crater 8 is formed and continues to deepen until a steady state is achieved, whereby excavation of the crater is equalized by infill of the crater's sides. Heavy objects such as large rocks, or dense materials, such as metals, will generally remain in the crater and can be collected separately, for example, by divers. The machine is maintained in an upright position during deployment by use of a buoyancy tank 9, the buoyancy of which is alterable to make the machine negatively, neutrally or positively buoyant, and the machine is kept on location away from the seabed over which it is being deployed by means of an anchor 10.
1. A remote underwater excavator comprising a tube having a w
REFERENCES:
patent: 4073078 (1978-02-01), Leitz
patent: 4073079 (1978-02-01), Klinefelter
patent: 4386473 (1983-06-01), Amann et al.
patent: 4694645 (1987-09-01), Flyborg et al.
patent: 4761096 (1988-08-01), Lin
Bagnell David J.
Consortium Resource Management Limited
Massie IV Jerome W.
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