US3826023A - Wave motion compensating assembly for suction dredger - Google Patents

Wave motion compensating assembly for suction dredger Download PDF

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Publication number
US3826023A
US3826023A US00327875A US32787573A US3826023A US 3826023 A US3826023 A US 3826023A US 00327875 A US00327875 A US 00327875A US 32787573 A US32787573 A US 32787573A US 3826023 A US3826023 A US 3826023A
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United States
Prior art keywords
cable
winch
assembly
pulley
suction dredger
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Expired - Lifetime
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US00327875A
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English (en)
Inventor
Koning J De
Der Veen R Van
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/06—Floating substructures as supports
    • E02F9/067—Floating substructures as supports with arrangements for heave compensation

Definitions

  • ABSTRACT A Suction dredger comprising a vessel and a conduit suspended on the vessel by means of at least one lifting cable guided over a guide pulley beared in a support, the lifting cable being connected via a dashing compensator comprising a cable length variator with a winch mounted on the vessel is improved for considerably reducing the wear of the expensive lifting cable.
  • a dashing compensator comprising a cable length variator with a winch mounted on the vessel
  • the invention relates to a suction dredger comprising a vessel to be anchored during sucking up ground from a bottom lying under water and a flexible conduit suspended on the vessel by means of at least one lifting cable guided over a guide pulley beared in a support, said flexible conduit having a nozzle to be inserted into the bottom, said lifting cable being connected via a dashing compensator comprising a cable length variator with a winch mounted on the vessel.
  • This known suction dredger has the disadvantage, that each long, mostly thick and heavy lifting cable, which must adjust a part of the suction pipe under water, moves during each movement of the vessel owing to a sea level movement over the guide pulley resulting in that this expensive lifting cable is exposed to a quick wear, particularly with the dashing compensator.
  • the invention improves the known suction dredger in this respect, in that the support of the guide pulley of the lifting cable is suspended on the vessel by means of at least one support cable connected to the vessel through the cable length variator.
  • said lifting cable is not considerably shifted with respect to the guide pulley with a sea level movement, so that only the vessel moves with the waves and the suction pipe remains nearly at its place then together with the guide pulley and the lifting cable.
  • two lifting points of the nozzle axially spaced from each other are suspended on the vessel by means of separate guide pulleys beared in separate supports. Said supports can be suspended then on the vessel by means of separate support cables which are connected with the vessel via separate cable length variators.
  • FIGS. 1, 2 and 3 each schematically represent a suction dredger according to the invention being each time further developed.
  • the suction dredger 20 of FIG. 1 comprises a vessel 1 which is anchored by means of anchoring cables 21 during sucking up ground, e.g., sand from a bottom 9.
  • the suction dredger 20 comprises further a flexible conduit 3, mainly consisting of a flexible tube, in which flexible conduit 3 a pump 5 positioned under water 18 and a pump 22 positioned in the vessel 1 are mounted.
  • the conduit 3 has a nozzle 6 to be inserted into the bottom 9 which is connected via a bridge part 23 with an outlet 8 of a pump 7 pumping water 18 into the bottom 9.
  • the nozzle 6 of the conduit 3 is suspended on the vessel 1 by means of a lifting cable engaging the bridge part 23 and guided over a guide pulley ll rotatably beared in a support 24 and which lifting cable 10 is wound partly upon a winch drum 25 of a winch l3.
  • the guide pulley l1 and its support 24 constitute part of a wave motion compensating assembly including the compensator l6 piston/cylinder arrangement 26.
  • the assembly 26 consists of a hydraulic cylinder 27 communicating via a conduit 28 with an air barrel or pneumatic accumulator 30, which is filled to such an extent with liquid 29 and air 31, that the upward pressure upon the piston 32 is sufficient for taking up the force in the lifting cable 10.
  • the support 24 is suspended on the vessel 1 by means of a support cable 14, said support cable 14 running over a guide pulley 15 being rotatably beared in a frame 2 and said support cable 14 running via the compensator 16 while being attached to an eye 17 of the vessel 1.
  • the support cable 14 carries nearly the same weight as the lifting cable 10.
  • the support cable 14 is guided over a stationary rotatable pulley 33 and over a movable pulley 34 rotatably beared on the piston 32.
  • each lifting cable 10 keeps about the same position with respect to the guide pulley 11, but the support cable 14 will move with respect to its guide pulleys 15, 33 and 34, while the piston 32 chooses such a position, that the support cable 14 remains tightly and the vessel 1 may follow the sea level movement while the nozzle 6 and the support 24 remain nearly at a same place.
  • the winch 13 is veered, so that the suction mouth 19 of the nozzle 6 moves then deeper into the bottom 9.
  • the piston 32 moves against the air locked in the air barrel 30, so that the wave motion compensator 16 veers or hauls support cable 14, while the guide pulley l 1 can nearly stand still with respect to the nozzle 6.
  • the lifting cable 10 can be one single thick cable or can consist of a number of rather thick cables, because said lifting cable 10 does not move so frequently, whereas the support cable 14 preferably consists of a number of rather thin cables which run parallelly side by side because said support cable 14 runs frequently over guide pulleys 34, 33 and 15.
  • FIGS. 2 and 3 Each suction dredger of FIGS. 2 and 3 is identical to the suction dredger 20 of FIG. 1 with the understanding that said suction dredger differs from the suction dredger 20 as far as is described below.
  • the flexible conduit 3 consists of three rigid tube parts 3a, 3b and 6 being swingably connected with each other by means of hinges 35, namely a tube part 3a communicating with the pump 22, a nozzle 6 carrying a suction mouth 19 and a tube part 3b lying between said tube parts 3a and 6.
  • the nozzle 6 is adjusted by means of two separate lifting cables 10, which engage two lifting points 36 of the nozzle 6 lying axially from each other.
  • Each-lifting cable 10 of FIG. 2 is controlled independently by means of a winch l3 and is suspended by means of a support cable 14 via separate compensators 16 in the same way as the lifting cable 10 of FIG. 1.
  • the supports 24 of the guide pulleys 11 are combined to one single, common support 24 constituting a tongue.
  • the guide pulleys 11 are positioned on a distance from each other.
  • This support 24 is again suspended on the vessel 1, just like the support 24 of FIG. 1, by means of a support cable 14 via a compensator 16.
  • the tube part 3a is suspended on the vessel 1 by means of a lift- 3 ing cable 37 via a motion compensator 38 and a winch 39.
  • a suction dredger assembly comprising, in combination:
  • suction dredging means including a nozzle adapted to be inserted into the bottom below said hull and a flexible conduit portion between said nozzle and the hull whereby the flexible conduit portion is free to flex as the hull rises and falls due to wave action without significantly affecting the position of said nozzle;
  • a wave motion compensating assembly comprising a length of motion-compensating cable secured to said hull, a first pulley fixed to said hull and over which said motion-compensating cable is trained, a support fixed to said motion-compensating cable below said pulley, and load-responsive means for paying out and reeling in said motioncompensating cable over said first pulley;
  • a winch cable issuing from said winch means and connected to said nozzle to support same in desired bottom-penetrating position, and a load-bearing pulley carried by said support and over which said winch cable is trained whereby the load imposed on said winch cable is imparted to said motioncompensating cable;
  • said motion-compensating cable being of a length to position said load-bearing pulley to define a substantially horizontal winch cable section between such load bearing pulley and said winch means whereby minimally to travel said winch cable over said load-bearing pulley in response to paying out and reeling in of said motion-compensating cable.
  • a suction dredger assembly as defined in claim 1 including a frame mounted on said hull and projecting upwardly and outboard therefrom, said first pulley being carried by the outboard end of said frame whereby to provide a substantial length of said horizontal winch cable section.
  • a suction dredger assembly as defined in claim 2 including second winch means mounted on said hull and a second winch cable issuing therefrom, said second winch cable being connected to said nozzle in spaced relation to the point of attachment of the firstmentioned winch cable thereto.
  • a suction dredger assembly as defined in claim 4 including a second wave motion compensating assembly associated with said second winch cable.
  • a suction dredger assembly as defined in claim 7 including second winch means mounted on said hull and a second winch cable issuing therefrom, said second winch cable being connected to said nozzle in spaced relation to the point of attachment of the firstmentioned winch cable thereto.
  • a suction dredger assembly as defined in claim 8 including a second wave motion compensating assembly associated with said second winch cable.
  • a suction dredger assembly as defined in claim 1 including second winch means mounted on said hull and a second winch cable issuing therefrom, said second winch cable being connected to said nozzle in spaced relation to the point of attachment of the firstmentioned winch cable thereto.
  • a suction dredger assembly as defined in claim 11 including a second wave motion compensating assembly associated with said second winch cable.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Guides For Winding Or Rewinding, Or Guides For Filamentary Materials (AREA)
  • Earth Drilling (AREA)
US00327875A 1972-01-28 1973-01-29 Wave motion compensating assembly for suction dredger Expired - Lifetime US3826023A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL727201216A NL153628B (nl) 1972-01-28 1972-01-28 Grondzuiger met deiningscompensator.

Publications (1)

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US3826023A true US3826023A (en) 1974-07-30

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US00327875A Expired - Lifetime US3826023A (en) 1972-01-28 1973-01-29 Wave motion compensating assembly for suction dredger

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US (1) US3826023A (nl)
BE (1) BE794562A (nl)
DE (1) DE2303848A1 (nl)
FR (1) FR2169379B1 (nl)
GB (1) GB1422023A (nl)
NL (1) NL153628B (nl)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157812A (en) * 1977-08-15 1979-06-12 Bunker Ramo Corporation Ship motion compensator for recovery of oceanographic instrumentation
EP0009516A1 (en) * 1978-09-29 1980-04-16 Ballast-Nedam Groep N.V. Method and device for maintaining tools at a level below a water surface
EP1039041A1 (en) * 1999-03-22 2000-09-27 Marine Structure Consultants (MSC) B.V. Method for positioning a digging tool relative to a vessel, and vessel with digging tool
WO2012060691A3 (en) * 2010-10-06 2012-06-21 Baggermaatschappij Boskalis B.V. Dredging assembly

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2418841A2 (fr) * 1978-03-01 1979-09-28 Petroles Cie Francaise Systeme d'excavation en mer a guidage horizontal de la benne preneuse au moyen de cables
US4179233A (en) * 1977-07-14 1979-12-18 National Advanced Drilling Machines, Inc. Vertical motion compensated crane apparatus
CA1100447A (en) * 1977-07-14 1981-05-05 Raymond J. Bromell Hook-mounted vertical motion compensation apparatus
FR2531692A1 (fr) * 1982-08-13 1984-02-17 Bretagne Atel Chantiers Dispositif de suspension d'elinde de drague avec compensation de pilonnement
NL8302006A (nl) * 1983-06-06 1985-01-02 Hydraudyne Bv Hijsinrichting met gecompenseerde takel.
GB2177995B (en) * 1985-07-19 1988-07-27 Ferranti Subsea Systems Marine umbilical connection arrangement

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US417353A (en) * 1889-12-17 Callen
GB851333A (en) * 1959-02-17 1960-10-12 Verschure & Co S Scheepswerf E Improvements in or relating to suction and/or expulsion dredgers
US3001396A (en) * 1958-02-14 1961-09-26 James L Cleveland Apparatus for maintaining proper depth correlation in well logging apparatus
US3512281A (en) * 1966-11-28 1970-05-19 Mineraal Technologisch Inst Swell compensator for a drag suction dredger
US3681862A (en) * 1968-11-20 1972-08-08 Ingbureau Voor Systems En Octr Suction dredger having plural pumps and plural articulated pipe sections
US3734564A (en) * 1970-04-27 1973-05-22 Mckay C Endless bucket dredge with articulated ladder and swell compensator
US3739503A (en) * 1970-08-11 1973-06-19 G Barker Hydraulic dredge having articulated ladder and swell compensator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US417353A (en) * 1889-12-17 Callen
US3001396A (en) * 1958-02-14 1961-09-26 James L Cleveland Apparatus for maintaining proper depth correlation in well logging apparatus
GB851333A (en) * 1959-02-17 1960-10-12 Verschure & Co S Scheepswerf E Improvements in or relating to suction and/or expulsion dredgers
US3512281A (en) * 1966-11-28 1970-05-19 Mineraal Technologisch Inst Swell compensator for a drag suction dredger
US3681862A (en) * 1968-11-20 1972-08-08 Ingbureau Voor Systems En Octr Suction dredger having plural pumps and plural articulated pipe sections
US3734564A (en) * 1970-04-27 1973-05-22 Mckay C Endless bucket dredge with articulated ladder and swell compensator
US3739503A (en) * 1970-08-11 1973-06-19 G Barker Hydraulic dredge having articulated ladder and swell compensator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157812A (en) * 1977-08-15 1979-06-12 Bunker Ramo Corporation Ship motion compensator for recovery of oceanographic instrumentation
EP0009516A1 (en) * 1978-09-29 1980-04-16 Ballast-Nedam Groep N.V. Method and device for maintaining tools at a level below a water surface
US4584784A (en) * 1978-09-29 1986-04-29 Wolters Tjako A Method and device for maintaining tools at a level
EP1039041A1 (en) * 1999-03-22 2000-09-27 Marine Structure Consultants (MSC) B.V. Method for positioning a digging tool relative to a vessel, and vessel with digging tool
NL1011629C2 (nl) * 1999-03-22 2000-09-27 Marine Structure Consul Werkwijze voor het positioneren van een graafgereedschap ten opzichte van een vaartuig alsmede een vaartuig met graafgereedschap.
WO2012060691A3 (en) * 2010-10-06 2012-06-21 Baggermaatschappij Boskalis B.V. Dredging assembly

Also Published As

Publication number Publication date
NL153628B (nl) 1977-06-15
FR2169379A1 (nl) 1973-09-07
DE2303848A1 (de) 1973-08-02
BE794562A (nl) 1973-07-26
FR2169379B1 (nl) 1976-11-05
GB1422023A (en) 1976-01-21
NL7201216A (nl) 1973-07-31

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