US3589040A - Mechanism for anticipating the concentration of sand in a dredging suspension - Google Patents

Mechanism for anticipating the concentration of sand in a dredging suspension Download PDF

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Publication number
US3589040A
US3589040A US729229A US3589040DA US3589040A US 3589040 A US3589040 A US 3589040A US 729229 A US729229 A US 729229A US 3589040D A US3589040D A US 3589040DA US 3589040 A US3589040 A US 3589040A
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United States
Prior art keywords
pressure
suction
sand
pipe
water
Prior art date
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Expired - Lifetime
Application number
US729229A
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English (en)
Inventor
Jan De Koning
Romke Van Der Veen
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Ingenieursbureau voor Systemen en Octrooien Spanstaal BV
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Ingenieursbureau voor Systemen en Octrooien Spanstaal BV
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Publication of US3589040A publication Critical patent/US3589040A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/907—Measuring or control devices, e.g. control units, detection means or sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S37/00—Excavating
    • Y10S37/906—Visual aids and indicators for excavating tool

Definitions

  • the invention relates to a suction dredger installation, comprising a suction pipe connected to a pump.
  • a known suction dredger installation of the kind specified is used in many cases for sucking up dredger spoil, the end of the suction pipe being inserted in the soil.
  • the suction process is then influenced by the particular varying circumstances present adjacent the end of the suction pipe.
  • the output which can be obtained with the prior art suction dredger installation depends considerably on the technical skill and experience of the dredging supervisor in groping in the dark.
  • the invention provides an improved suction dredger installation which is characterized by at least one pressure-sensitive element which senses the pressure, in the soil adjacent the end of the suction pipe.
  • a larger output can be obtained with the improved suction dredger installation according to the invention if the pressure in the soil adjacent the end of the suction pipe is known.
  • This is an important indication which is not available with the prior art suction'dredger installation.
  • a quantity to be regulated e.g., the conveyed concentration of dredger spoil in the suspension sucked up
  • the suction dredger installation accordingto the invention enables the future value of the quantity to be regulated to be predicted by taking into account the pressure in the soil adjacent the end of the suction pipe, thus also enabling this particular quantity to be regulated in anticipation, in dependence on the pressure in the soil.
  • At least one regulating member for regulating the suction process is acted upon by the sensed value emanating from the first-mentioned pressure-sensitive element.
  • the pressure-sensing element forms part of a depth-measuring system for measuring the depth at which the end of the suction pipe is situated below the surface of the soil.
  • the suction pipe can be duly displaced, or duly inserted more deeply into the soil, to prevent clay and other impurities floating on the sand from being sucked up instead of sand.
  • the suction mouth may be clogged by large objects which are otten to be found on the surface of the soil. Stagnation caused by clogging of this kind can be substantially obviated by using the suction dredger installation according to the invention.
  • the suction dredger installation according to the invention is so constructed that the depth-measuring system comprises a pressure-difference pickup, one side of which is acted upon by the first-mentioned pressure-sensing element disposed adjacent the end of the suction pipe, the other side being acted upon by a second pressure-sensitive element which senses the water pressure above the soil.
  • the depth-measuring system comprises a pressure-difference pickup, one side of which is acted upon by the first-mentioned pressure-sensing element disposed adjacent the end of the suction pipe, the other side being acted upon by a second pressure-sensitive element which senses the water pressure above the soil.
  • FlG. i is s drawing illustrating a suction dredger installation according to thc invention during the sucking up of sand and FIG. 2, 3 and 4 each show the lower end of the suction pipe of variant embodiments of the suction dredger installation according to the invention.
  • the suction dredger installation according to the invention shown in FIG. 1 comprises a ship 10, a pump ii, a pressure line 12 connected to the pressure side of the pump ii, and s suction pipe 13 which has a suction mouth 20 and is connected to the suction side of the pump 11.
  • the pump 11 is disposed at. the level of the water 14, and the suction pipe 13 can pivot around the center line of the pump 11.
  • P10. 1 shows (counting upwards) a layer of sand 15, a layer of clay 16, and water 18.
  • the free end of the suction pipe 13 is inserted into the soil, to a great depth, for instance 20 m.
  • the soil shown enclosed by a chaindot line 19 and surrounding the end of the suction pipe 13 is brought into suspension by underdigging. Outside the line 19, the :soil is in its normal undisturbed condition.
  • the suction dredger installation shown in FIG. 1 has a measuring system mainly consisting of a pressure pickup 21 at the end of the suction pipe 13 and an indicator 22.
  • the pressure pickup 21 measures, by means of a pressure-sensitive element forming part of the pressure pickup 21 and not shown in detail, the local prevailing pressure produced by a column of sand H a column of clay li and a column of water H,.
  • the indicator 22 consists of a pointer 23 which is attached to the suction pipe 13 and has a graduated scale 24 from which the angle a can be read off, which the suction pipe 13 encloses with the horizontal plane.
  • the depth H of the pressure pickup 21 below the surface 14 of the water is equal to k sin a, where k :is the length of the suction pipe from the surface 14 of the water to the pressure pickup 21.
  • the height H of the column of sand can now be calculated by the equation:
  • P is the pressure measured by the pressure pickup 2i
  • l! is the water column 8,, is the specific weight of the clay H, is the column of clay and S, is the specific weight of the sand.
  • the column of clay l-i, and the specific weight 5, are measured by carrying out drillings.
  • the specific weight 8,, of the drifting sand is a value known for a particular kind of sand, for instance, l.8 kgJdm".
  • the column of sand H can be measured considerably more simply and accurately by means of a known pressure-difference pickup 25 which is used in the suction pipe 45 illustrated in FIG. 2; in the pressure-difference pickup 25 one pressure chamber 28 is acted upon by the local pressure in the soil the other pressure chamber 26 being connected via a line 27 to the water 18 above the soil. in this case the relative pressure pickup 25 measures a pressure
  • the pressure chamber 28 is separated from the soil by a diaphragm 17. Thus the measuring diaphragm 47 is protected from damage.
  • the diaphragm 17 forms a first pressure-sensing element which is directly acted upon by the pressure in the soil and transmits this pressure via the liquid in the chamber 28 to the measuring diaphragm 47, while the inlet aperture 46 of the line 2.7 forms the second pressure-sensing element, from which the sensed pressure is transmitted via the liquid in the line 27 and in the chamber 26 to the measuring diaphragm 47.
  • the suction pipe 323 shown in F116. 3 has a measuring system formed by a pressure water line 29 which is connected to a pressure source and branches into two narrow branches 3t 31 which have respectively a first outflow aperture 32 in the soil adjacent the suction mouth 34, thus forming a first pressuresensing element, and an outflow aperture 33 which discharges above the soil into the water 18, thus forming a second pressure-sensitive element, Adjacent the outflow apertures 32, 33 the branches 3th, 311 are connected to either side of the pres sure-difference pickup 3'7 via measuring lines 35 and 36 respectively. The pressuredifference pickup 37 thus measures the difference in pressure between the apertures 32 and 33.
  • the column of sand H above the outflow aperture 3?. can be derived therefrom.
  • the suction pipe 325 shown in FIG. 3 comprises a pipe 39 which is connected to the pump ill, and a telescopic pipe 40 which can be moved axially in the pipe 39 by a hydraulic ram 41.
  • the measuring system is very useful for regulating the concentration of dredge: spoil in the suckedup suspension.
  • the aperture 32, and the pressure pickups 2H and 25 are preferably not disposed in exactly the same place as the suction mouth, but at a small distance m thereabove, where the flows around the suction mouth have little effect on the pressure measured, if any. when determining the depth of the suction mouth, the depth of the pressure pickup is then added with m sin a.
  • the pressure pickup 21 and the relative pressure pickups 25 and 37 are, for instance, of the known electric type and are each connected via electric wires to an indicating system (not shown) disposed on the control panel on board of the ship.
  • the members of the suction pipe 138 shown in FIG. 4 corresponding with members of the suction pipe 38, have like reference numbers that are MW higher however.
  • the suction pipe 138 has a measuring system formed by a pressure water line 129 which is connected to a water source and has an outflow aperture 132 in the soil adjacent the suction mouth 13 1, the outflow aperture 132 forming a pressuresensitive element connected via a measuring line 135 to a pressure pickup 137 whose diaphragm 144 picks up the pressure sensed in the soil.
  • the electric output signal from the pressure pickup 137 is fed via a line 148 to a measuring member 149 which operates a hydraulic regulating valve 150.
  • This regulating valve 150 controls a hydraulic ram 141 for adjusting the height of telescopic pipe 140.
  • the output signal from the pressure pickup 137 can also be controlled by other regulating members (not shown) for regulating the suction process, for instance, the governor (not shown) of the pump motor.
  • the height of the telescopic pipe M0 in relation to the suction mouth 134 can be adjusted in dependence on other measured values (not indicated in detail).
  • a suction dredger assembly of the type including a fluid pump having a suction inlet and a pressure outlet, and
  • dredging conduit means havingone end connected to said suction inlet and having an opposite end inserted below the bottom of a body of water into a region of material desired to be dredged so as to deliver a suspension of said material in water at said outlet of the pump, the improvement of which comprises,
  • pressure sensing means supported on said opposite end of the conduit means for producing an output signal proportional to the pressure in said material outside said opposite end of the conduit means whereby the depth at which said opposite end of the conduit means is situated in said material may be determined;
  • control means for controlling said dredger assembly to maximize the output of said material delivered by said pump in accordance with the pressure sensed by said pressure sensing means.
  • conduit means comprises an outer pipe defining, at its lower extremity, said opposite end of the conduit means, and having its upper extremity above the level of said bottom and within said body of water, an inner pipe connected at its upper end to said suction inlet and having a lower end portion presenting a lower extremity disposed within the confines of said outer pipe;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Treatment Of Sludge (AREA)
  • Paper (AREA)
  • Manipulator (AREA)
  • Measuring Fluid Pressure (AREA)
US729229A 1967-05-24 1968-05-15 Mechanism for anticipating the concentration of sand in a dredging suspension Expired - Lifetime US3589040A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL676707167A NL145919B (nl) 1967-05-24 1967-05-24 Zuigbaggerinstallatie.

Publications (1)

Publication Number Publication Date
US3589040A true US3589040A (en) 1971-06-29

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Family Applications (1)

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US729229A Expired - Lifetime US3589040A (en) 1967-05-24 1968-05-15 Mechanism for anticipating the concentration of sand in a dredging suspension

Country Status (6)

Country Link
US (1) US3589040A (forum.php)
BE (1) BE715482A (forum.php)
DE (1) DE1759588C3 (forum.php)
FR (1) FR1565971A (forum.php)
GB (1) GB1174706A (forum.php)
NL (1) NL145919B (forum.php)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020573A (en) * 1974-02-25 1977-05-03 Ballast-Nedam Group N.V. Method and device for sucking up a solid substance from a stock
US4217709A (en) * 1978-02-24 1980-08-19 The Research Corporation Of The University Of Hawaii Submarine sand sampler
US4242815A (en) * 1977-04-28 1981-01-06 Koninklijke Bos Kalis Westminster Group N.V. Suction pipe position control
DE19534882A1 (de) * 1995-09-20 1997-03-27 Abb Patent Gmbh Verfahren zur Grundwasser- und Bodensanierung

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US934031A (en) * 1908-09-16 1909-09-14 Charles B Askew Hydraulic excavator.
US1255034A (en) * 1916-07-29 1918-01-29 Archibald O Mason Automatic sounding device.
US2328954A (en) * 1942-04-18 1943-09-07 Mary W Conley Liquid depth indicator system
US2645128A (en) * 1951-02-09 1953-07-14 Harold N Walker Apparatus for measuring water pressures in earth embankments
US2661550A (en) * 1951-05-02 1953-12-08 Instr Inc Method and apparatus for controlling a dredging operation
US2931225A (en) * 1954-08-24 1960-04-05 Pleuger Friedrich Wilhelm Instrument for indicating oil level, ground pressure, and temperature in an oil well
GB999635A (en) * 1962-05-10 1965-07-28 Stamicarbon Process and installation for transporting solid material with the aid of compressed air
US3224121A (en) * 1963-01-29 1965-12-21 Rick A Denning Apparatus for optimizing dredge production
NL6501405A (forum.php) * 1965-02-04 1966-08-05
NL6501404A (forum.php) * 1965-02-04 1966-08-05

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US934031A (en) * 1908-09-16 1909-09-14 Charles B Askew Hydraulic excavator.
US1255034A (en) * 1916-07-29 1918-01-29 Archibald O Mason Automatic sounding device.
US2328954A (en) * 1942-04-18 1943-09-07 Mary W Conley Liquid depth indicator system
US2645128A (en) * 1951-02-09 1953-07-14 Harold N Walker Apparatus for measuring water pressures in earth embankments
US2661550A (en) * 1951-05-02 1953-12-08 Instr Inc Method and apparatus for controlling a dredging operation
US2931225A (en) * 1954-08-24 1960-04-05 Pleuger Friedrich Wilhelm Instrument for indicating oil level, ground pressure, and temperature in an oil well
GB999635A (en) * 1962-05-10 1965-07-28 Stamicarbon Process and installation for transporting solid material with the aid of compressed air
US3224121A (en) * 1963-01-29 1965-12-21 Rick A Denning Apparatus for optimizing dredge production
NL6501405A (forum.php) * 1965-02-04 1966-08-05
NL6501404A (forum.php) * 1965-02-04 1966-08-05

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020573A (en) * 1974-02-25 1977-05-03 Ballast-Nedam Group N.V. Method and device for sucking up a solid substance from a stock
US4242815A (en) * 1977-04-28 1981-01-06 Koninklijke Bos Kalis Westminster Group N.V. Suction pipe position control
US4217709A (en) * 1978-02-24 1980-08-19 The Research Corporation Of The University Of Hawaii Submarine sand sampler
DE19534882A1 (de) * 1995-09-20 1997-03-27 Abb Patent Gmbh Verfahren zur Grundwasser- und Bodensanierung

Also Published As

Publication number Publication date
DE1759588A1 (de) 1971-09-16
NL145919B (nl) 1975-05-15
GB1174706A (en) 1969-12-17
FR1565971A (forum.php) 1969-05-02
DE1759588B2 (de) 1973-02-22
NL6707167A (forum.php) 1968-11-25
BE715482A (forum.php) 1968-11-21
DE1759588C3 (de) 1973-09-13

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