US3585740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and suction dredging installation for sucking up dredging spoil
Assignee: INGBUREAU VOOR SYSTEM EN OCTRO
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Filing: 1968-10-07
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Granted: 1971-06-22
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Expires: 1988-10-07
Abstract
Abstract In dredging sand from an underwater body of sand, the lower end of a suction pipe is inserted into the sand and water under pressure is introduced into the pipe at a level above the lower end of the pipe while suction is maintained at the upper end of the pipe to withdraw a suspension of sand in water having a desired concentration of sand in it which is less than the concentration entering the lower end of the pipe. To lessen the energy required to maintain the suction, the relation between the pressure of the water introduced and the level of its introduction is controlled so that the predetermined concentration of sand exists in the pipe above such level while the level lies well below the top of the body of sand and relatively close to the lower end of the pipe.
Inventors
- 👤 Jan De Koning
- 👤 Tjako Aaldrik Wolters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:55
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9243; E02F3/925
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
241 words
The method of dredging sand or like material, which comprises the steps of: a. inserting the lower end of a pipe into an underwater body of sand whereby a column of sand tends to rise in said pipe due to the static head of said body of sand above said lower end of the pipe; b. introducing water into said pipe above the lower end thereof at a pressure sufficient to prevent the column of sand from rising in said pipe to that one level to which said static head tends to force it, thereby to depress the top of said column of sand to an operating level within said pipe which is well below said one level and is relatively close to said lower end of the pipe; c. withdrawing a column of a suspension of sand in water which extends from a point within said pipe upwardly to a point of discharge by maintaining suction on such column of suspension; and d. adjusting said point within the pipe at which said column of suspension is withdrawn in step (c) to a position near or at said operating level such that a controlled concentration of sand exists in said column of suspension upwardly from said point so that said point lies well below the top of the body of sand and relatively close to said lower end of the pipe whereby to lessen the energy required to maintain said suction.
Claim 2
Independent Claim
241 words
The method of dredging sand or like material, which comprises the steps of: a. inserting the lower end of a pipe into an underwater body of sand whereby a column of sand tends to rise in said pipe due to the static head of said body of sand above said lower end of the pipe; b. introducing water into said pipe above the lower end thereof at a pressure sufficient to prevent the column of sand from rising in said pipe to that one level to which said static head tends to force it, thereby to depress the top of said column of sand to an operating level within said pipe which is well below said one level and is relatively close to said lower end of the pipe; c. withdrawing a column of a suspension of sand in water which extends from a point within said pipe upwardly to a point of discharge by maintaining suction on such column of suspension; and d. adjusting said point within the pipe at which said column of suspension is withdrawn in step (c) to a position near or at said operating level such that a controlled concentration of sand exists in said column of suspension upwardly from said point so that said point lies well below the top of the body of sand and relatively close to said lower end of the pipe whereby to lessen the energy required to maintain said suction.
Claim 3
Dependent Claim
215 words
A suction dredging installation comprising, in combination; a pump having an inlet for inducting a suspension of dredging spoil in water and an outlet for discharging said suspension; a suction pipe having a lower end defining a first suction mouth for dredging spoil and adapted to be inserted into an underwater body of dredging spoil whereby a column of dredging spoil tends to rise therein due to the static head of the dredging spoil above said lower end of the suction pipe; means forming a second suction mouth within said suction pipe above said first suction mouth, said means being connected to said inlet of the pump; means for introducing water into said pipe at a pressure sufficient to prevent the column of dredging spoil from rising in said pipe to that one level to which said static head tends to force it, thereby to depress the top of said column of dredging spoil to an operating level within said pipe which is well below said one level and is relatively close to said first suction mouth; and means for adjusting said second suction mouth to a position at or near said operating level such that a controlled concentration of dredging spoil exists in said suspension whereby to lessen the energy required of said pump.
Claim 4
Dependent Claim
215 words
A suction dredging installation comprising, in combination; a pump having an inlet for inducting a suspension of dredging spoil in water and an outlet for discharging said suspension; a suction pipe having a lower end defining a first suction mouth for dredging spoil and adapted to be inserted into an underwater body of dredging spoil whereby a column of dredging spoil tends to rise therein due to the static head of the dredging spoil above said lower end of the suction pipe; means forming a second suction mouth within said suction pipe above said first suction mouth, said means being connected to said inlet of the pump; means for introducing water into said pipe at a pressure sufficient to prevent the column of dredging spoil from rising in said pipe to that one level to which said static head tends to force it, thereby to depress the top of said column of dredging spoil to an operating level within said pipe which is well below said one level and is relatively close to said first suction mouth; and means for adjusting said second suction mouth to a position at or near said operating level such that a controlled concentration of dredging spoil exists in said suspension whereby to lessen the energy required of said pump.
Claim 5
Dependent Claim
21 words
A suction dredging installation according to claim 2, characterized in that said means for introducing water comprises a water jet pump.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |