US3585740A - Method and suction dredging installation for sucking up dredging spoil - Google Patents

Method and suction dredging installation for sucking up dredging spoil Download PDF

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Publication number
US3585740A
US3585740A US765415A US3585740DA US3585740A US 3585740 A US3585740 A US 3585740A US 765415 A US765415 A US 765415A US 3585740D A US3585740D A US 3585740DA US 3585740 A US3585740 A US 3585740A
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United States
Prior art keywords
pipe
suction
sand
dredging
column
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US765415A
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English (en)
Inventor
Jan De Koning
Tjako Aaldrik Wolters
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
INGBUREAU VOOR SYSTEM EN OCTRO
Nv Ingenieursbureau Voor System En Octrooien
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INGBUREAU VOOR SYSTEM EN OCTRO
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Application filed by INGBUREAU VOOR SYSTEM EN OCTRO filed Critical INGBUREAU VOOR SYSTEM EN OCTRO
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Publication of US3585740A publication Critical patent/US3585740A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9243—Passive suction heads with no mechanical cutting means
    • E02F3/925—Passive suction heads with no mechanical cutting means with jets

Definitions

  • Crowder A trorney Snyder Butrum 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.
  • the invention relates to improvements in that method of sucking up dredging spoil which involves a suction pipe which is connected at its proximal end to a pump and which has a first suction mouth at its distal end.
  • a second suction mouth is provided to allow water to flow into the pipe at a selected distance and adjustable above the first suction mouth, the first suction mouth sucking essentially only dredging spoil and the second suction mouth sucking essentially only water into the suction pipe.
  • the end of the suction pipe is inserted into a body of the dredging spoil to be sucked up and the distance between the second suction mouth and the first suction mouth being adjusted during operation such that the second suction mouth is disposed essentially at that level to which the static head on the spoil tends to elevate same within the suction pipe.
  • the improvement in this method according to the present invention involves the introduction of water under pressure to the second suction mouth, the distance between the first and second suction mouths being adjusted in dependence on the pressure of the water so introduced.
  • This method results in the advantage that in addition to regulation of the concentration in the suspension sucked up, the total weight of the column in suspension is lighter because the second suction mouth may be adjusted closer to the end of the suction pipe.
  • the suction pump to which the suction pipe is connected produces a higher output in these circumstances.
  • FIG. 1 shows diagrammatically the position of a suction dredging installation during the performance of the method according to the invention
  • FIG. 2 shows the lower end of a suction pipe of a suction dredging installation further developed according to the invention
  • FIG. 3 shows a section, taken along the line lII-lll in FIG. 2;
  • FIG. 4 is a view similar to FIG. 3 but showing the inner pipe retracted.
  • the suction dredging installation consists essentially of a supporting vessel It), a driven sand pump 11, a suction pipe 12 connected to the intake side of the sand pump 11, a pressure pipe 13 connected to the delivery side of the sand pump 11, a water pump 14, a suction line 15 connected to the intake line of the water pump 14, and a pressure line 16 connected to the delivery side of the water pump 14.
  • the suction pipe 12 is pivotably connected to the vessel 10 about the center line of the sand pump 11 whereas the pressure line 16 is connected to the water pump 14 via a flexible member 17.
  • the suction pipe 12 includes an inner pipe 18, a jacket 19 which is rigidly connected thereto and which projects beyond the inner pipe 18, and a sliding pipe 20 which can be slid telescopically in relation to the inner pipe 18 by means of a hydraulic cylinder 21 as is shown more particularly in FIG. 2.
  • the pressure line 16 is connected to a jet nozzle 22 of a water jet pump 23 by means of which outside water is inducted in large amounts through inlet apertures 24 of the jet pump and forced into the jacket 19, see particularly FIG. 2.
  • the jacket 19 is open at its lower end to present a first suction mouth 25 through which dredging spoil enters.
  • the water introduced under pressure into the jacket 19 passes into the sliding pipe 20 via an annular aperture between the sliding pipe 20 and the jacket 19, said annular aperture forming a second suction mouth 26.
  • That portion 19a of the jacket 19 which is disposed below the lower end of the sliding pipe 20 contains a relatively high concentration of dredging spoil which, after admixture with water from above the lower end of the pipe 20, is delivered at the desired concentration to the inlet of the sand pump 11.
  • the end of the suction pipe 12 is inserted deeply below the surface of the body of sand 27 while sand is sucked up.
  • the sand surrounding and above the lower end of the suction pipe 12, for instance that sand within the chain-dot line 28, is fluidized so that it tends to rise in the suction pipe 12 to that level above the first suction mouth 25 to which the static head thereon forces it.
  • the jacket 19 is filled with water under pressure, however, the sand cannot rise to such level, but may rise only to that level established by the differential between the water pressure and the static head.
  • the pressure in the jacket 19 is kept during the dredging operation to a value such that the sand on the one hand cannot rise past that level to which the lower edge of the sliding pipe 20 is adjusted, and on the other hand is able to enter through the first suction mouth 25.
  • the telescopic pipe20 is adjusted so that the level at which water is introduced through the mouth 26, relative to the first suction mouth 25, such that the spacing between these mouths together with the prevailing pressure of the water under pressure in the jacket 19 establish a suspension of sand and water from the lower end of the pipe 20 to the inlet of the pump 11 in which the concentration of sand has the required value. If too much or too little water is sucked into the sliding pipe 20, this can be corrected by its being lowered or raised respectively.
  • the suction pipe is inserted deeply into the sand, the required travel of the sliding pipe 20 is substantially smaller than that required of the telescopic pipe in the prior art suction pipe.
  • the reason for this is that since in both instances the rimer or sliding pipe is extended to or beyond the outer pipe while the suction pipe is being inserted and during initiation of the dredging operation, the pipe must be retracted a much greater distance in the prior art device, i.e. the end of the inner pipe in the present instance is disposed ultimately much closer to the lower end of the outer pipe.
  • the jacket 119 is narrowed at its lower end as illustrated clearly in FIG. 3, presenting central portions having semicircular duct 129 on either side.
  • the sliding pipe 120 is provided at its lower end with semicircular nozzles I30 communicating with the space within the jacket 119 so that when the nozzles 130 are within the ducts 129, the water introduced into the jacket 119 is constrained to issue only through the nozzles 130 at a relatively high velocity as compared with the velocity of water flow which exists through the mouth 126 when the pipe 120 is retracted as shown in FIG. 4.
  • the FIG. 4 position corresponds to that shown in FIG.
  • the first suction mouth then being defined by the open lower end of the jacket 119 whereas the second suction mouth 126 is defined not only by the areas of the nozzles but also by the annular space surrounding the lower extremity of the pipe 120.
  • the telescopic pipe 120 is projected outwardly as shown in FIG. 3.
  • the spout nozzles 130 are thus connected via the ducts 129 to the jacket 119 so that water issues through the nozzles at a high pressure during the inserting of the suction pipe 112 into the-sand.
  • the pipe 120 is retracted as in FIG. 4 during the sucking up of sand so that a very large amount of water can be supplied at a relatively low overpressure.
  • step (c) 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.
  • 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;
  • said means for introducing water comprises a waterjet pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Treatment Of Sludge (AREA)
US765415A 1967-10-16 1968-10-07 Method and suction dredging installation for sucking up dredging spoil Expired - Lifetime US3585740A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL676714006A NL147218B (nl) 1967-10-16 1967-10-16 Werkwijze en zuigbaggerinstallatie voor het opzuigen van baggerspecie.

Publications (1)

Publication Number Publication Date
US3585740A true US3585740A (en) 1971-06-22

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ID=19801457

Family Applications (1)

Application Number Title Priority Date Filing Date
US765415A Expired - Lifetime US3585740A (en) 1967-10-16 1968-10-07 Method and suction dredging installation for sucking up dredging spoil

Country Status (7)

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US (1) US3585740A (da)
BE (1) BE722324A (da)
DE (1) DE1802158C3 (da)
DK (1) DK120070B (da)
FR (1) FR1587516A (da)
GB (1) GB1243064A (da)
NL (1) NL147218B (da)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479741A (en) * 1981-05-04 1984-10-30 Snamprogetti S.P.A. Device for laying underground or digging up subsea conduits
US4991321A (en) * 1990-06-21 1991-02-12 M-B-W Inc. Pneumatic device for excavating and removing material
US4991997A (en) * 1988-05-13 1991-02-12 Cowper Norman T Method and apparatus for the transport of particulate solids using a submerged fluid induction device
US4995175A (en) * 1987-04-28 1991-02-26 Johann Winter Pneumatic extraction head
US5212891A (en) * 1991-01-25 1993-05-25 The Charles Machine Works, Inc. Soft excavator
US6017400A (en) * 1997-05-15 2000-01-25 Orange County Water District Method and system for cleaning a water basin floor
US6446365B1 (en) 2000-09-15 2002-09-10 Vermeer Manufacturing Company Nozzle mount for soft excavation
DE19546845B4 (de) * 1994-12-20 2004-04-29 Ihc Holland N.V. Saugbaggerschiff mit einer an einem Kabel aufgehängten Saugvorrichtung, die mit einem Dünungskompensator versehen ist
US6751893B2 (en) 2000-09-15 2004-06-22 Vermeer Manufacturing Company Nozzle mount for soft excavation
EP2034096A1 (en) * 2007-09-06 2009-03-11 IHC Holland IE B.V. Suction dredger with dredging tube of variable length
BE1018278A3 (nl) * 2008-09-08 2010-08-03 Ihc Holland Ie Bv Baggerzuiger met baggerbuis met variabele lengte.
CN101560781B (zh) * 2009-05-19 2011-03-23 俞建国 一种疏浚吸头

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8104791A (nl) * 1981-10-22 1983-05-16 Berk Hendrikus Van Werkwijze voor het opzuigen van onder water gelegen bodemmateriaal en een inrichting voor het uitvoeren van de werkwijze.
DE3412970C2 (de) * 1984-04-06 1995-09-14 Winter Johann Förderkopf
NO318582B1 (no) * 2001-12-21 2005-04-11 Gto Subsea As Sugehode for mudring
CN104878780A (zh) * 2015-05-28 2015-09-02 中交一航局第二工程有限公司 沉管隧道基床整平过程中定时清淤防淤系统及方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US521883A (en) * 1894-06-26 Excavator and elevator
US661609A (en) * 1897-03-05 1900-11-13 Frank K Hoover Dredging-machine.
US1461240A (en) * 1922-10-24 1923-07-10 Bert O Godfrey Dredge
US1530654A (en) * 1923-01-02 1925-03-24 Fred A Daley Agitator, cutter, and feeder
US2125740A (en) * 1934-12-24 1938-08-02 William H Schacht Hydraulic excavating device or booster
US2906040A (en) * 1958-06-26 1959-09-29 Hefling Frank Air lift dredge
GB837669A (en) * 1958-12-05 1960-06-15 Blankevoort En Zoon N V D A method and apparatus for suction dredging
NL6501404A (da) * 1965-02-04 1966-08-05
NL6501405A (da) * 1965-02-04 1966-08-05

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US521883A (en) * 1894-06-26 Excavator and elevator
US661609A (en) * 1897-03-05 1900-11-13 Frank K Hoover Dredging-machine.
US1461240A (en) * 1922-10-24 1923-07-10 Bert O Godfrey Dredge
US1530654A (en) * 1923-01-02 1925-03-24 Fred A Daley Agitator, cutter, and feeder
US2125740A (en) * 1934-12-24 1938-08-02 William H Schacht Hydraulic excavating device or booster
US2906040A (en) * 1958-06-26 1959-09-29 Hefling Frank Air lift dredge
GB837669A (en) * 1958-12-05 1960-06-15 Blankevoort En Zoon N V D A method and apparatus for suction dredging
NL6501404A (da) * 1965-02-04 1966-08-05
NL6501405A (da) * 1965-02-04 1966-08-05

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479741A (en) * 1981-05-04 1984-10-30 Snamprogetti S.P.A. Device for laying underground or digging up subsea conduits
US4995175A (en) * 1987-04-28 1991-02-26 Johann Winter Pneumatic extraction head
US4991997A (en) * 1988-05-13 1991-02-12 Cowper Norman T Method and apparatus for the transport of particulate solids using a submerged fluid induction device
US4991321A (en) * 1990-06-21 1991-02-12 M-B-W Inc. Pneumatic device for excavating and removing material
US5212891A (en) * 1991-01-25 1993-05-25 The Charles Machine Works, Inc. Soft excavator
US5361855A (en) * 1991-01-25 1994-11-08 The Charles Machines Works, Inc. Method and casing for excavating a borehole
DE19546845B4 (de) * 1994-12-20 2004-04-29 Ihc Holland N.V. Saugbaggerschiff mit einer an einem Kabel aufgehängten Saugvorrichtung, die mit einem Dünungskompensator versehen ist
US6017400A (en) * 1997-05-15 2000-01-25 Orange County Water District Method and system for cleaning a water basin floor
US6446365B1 (en) 2000-09-15 2002-09-10 Vermeer Manufacturing Company Nozzle mount for soft excavation
US6751893B2 (en) 2000-09-15 2004-06-22 Vermeer Manufacturing Company Nozzle mount for soft excavation
EP2034096A1 (en) * 2007-09-06 2009-03-11 IHC Holland IE B.V. Suction dredger with dredging tube of variable length
BE1018278A3 (nl) * 2008-09-08 2010-08-03 Ihc Holland Ie Bv Baggerzuiger met baggerbuis met variabele lengte.
CN101560781B (zh) * 2009-05-19 2011-03-23 俞建国 一种疏浚吸头

Also Published As

Publication number Publication date
DE1802158C3 (de) 1979-04-26
GB1243064A (en) 1971-08-18
DK120070B (da) 1971-03-29
BE722324A (da) 1969-04-15
DE1802158B2 (de) 1978-08-31
DE1802158A1 (de) 1969-06-04
NL147218B (nl) 1975-09-15
FR1587516A (da) 1970-03-20
NL6714006A (da) 1969-04-18

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