US3893249A - Suction dredger with swell compensation - Google Patents

Suction dredger with swell compensation Download PDF

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Publication number
US3893249A
US3893249A US437761A US43776174A US3893249A US 3893249 A US3893249 A US 3893249A US 437761 A US437761 A US 437761A US 43776174 A US43776174 A US 43776174A US 3893249 A US3893249 A US 3893249A
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US
United States
Prior art keywords
vessel
cable
reversing
pulley
pairs
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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
US437761A
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English (en)
Inventor
Tjako Aaldrik Wolters
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Individual
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Individual
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Publication date
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Publication of US3893249A publication Critical patent/US3893249A/en
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Classifications

    • 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

  • This known earth dredger has the disadvantage that each long, often thick and heavy lifting cable having to position part of the duct under water moves during each movement of the vessel due to the waves along the reversing discs so that this expensive lifting cable is exposed to rapid wear particularly at the immersed lower reversing discs.
  • the cablelength varying device arranged in the known earth dredger between the winch and the upper reversing discs has a long stroke in order to compensate for high swell.
  • the invention provides an improvement in the earth dredger of the kind set forth in the preamble by arranging said plurality of cable portions via a cable-length varying device and via guide discs held by the vessel between the lower and upper reversing discs.
  • the cable is practically not displaced with respect to the lower reversing discs owing to said arrangement of the cablelength varying device.
  • the stroke of the cable-length varying device is materially shortened.
  • the cable When the two ends of the cable are wound on a winch drum, the cable has a minimum shift in place during the change of position of the duct.
  • FIG. I an earth dredger in accordance with the invention and FIG. 2 a plan view of an exploded view of the hoisting device of FIG. I.
  • the earth dredger 20 shown in FIG. 1 comprises a vessel 1, which is anchored by means of anchor cables 2I during dredging of earth, for example, sand, from a soil 9.
  • the earth dredger 20 comprises furthermore a flexible duct 3 mainly consisting of a hose accommodating a pump 5 immersed under the water level 18 and a pump 22 arranged in the vessel 1.
  • the duct 3 has a nozzle 6 to be inserted into the soil 9 and connected by a bridge piece 23 with an outlet 8 of a pump 7 pumping the water 18 into the soil 9.
  • the nozzle 6 of the duct 3 is suspended to the vessel I by means of a cable 10, six portions 80 of which extend, in accordance with the invention, via a cable-length varying device 26 and via six vessel-supported guide discs I5 between two upper reversing discs 14 anchored to the vessel I and three lower reversing discs 13 anchored to the duct 3.
  • the upper reversing discs I4 are journalled in bearings 25 rigidly secured to the vessel 1, whereas the lower reversing discs 13 are journalled in a block 24, which is connected by means of cables 81 with the bridge piece 23.
  • a swell compensator comprises a cable-length varying device formed by a hydraulic cylinder 27,
  • the portions of the cable I0 extend each along two guide discs 33 and I2 rotatably journalled in bearings 17 rigidly secured to the vessel I and along one movable guide disc 34 rotatably journalled on the piston 32.
  • the two ends of the cable I0 not passed along the upper reversing discs 14 are wound on two ganged winch drums 11 arranged on the vessel 1 and driven via a driving gear 2 by an engine 4.
  • each portion 80 of the cable 10 maintains approximately the same position relative to the winch drums I I, the upper reversing discs I4 and the lower reversing discs 13 and the guide discs 12, but the cable I0 will shift its position with respect to its guide discs I5, 33 and 34, whereas the piston 32 finds a position such that the cable 10 remains taut and the vessel I can follow the motion of the waves whilst the nozzle 6 substantially remains at its place.
  • the winch II is veered out so that the suction nozzle 19 of the nozzle 6 shifts to a greater depth in the soil 9.
  • the piston 32 moves against the air enclosed in the air vessel 30 so that the swell compensator I6 releases the cable 10 or takes up the same, whilst each lower reversing disc 13 can substantially remain stationary with respect to the cable 10.
  • the lifting cable 10 may have a plurality of portions differing from six.
  • the cable-length varying device 16 requires a displacement of not more than I/2S.
  • the duct 3 may consist of three rigid tube portions pivotally connected with each other, each of which is positioned by a cable 10 in accordance with the invention.
  • a suction dredger system comprising a buoyant vessel, and a suction dredger mounted on said vessel and including an elongate suction conduit terminating in a suction nozzle, the combination of:
  • a cable suspension system for suspending said nozzle from said vessel while the suction nozzle is inserted in the bottom below the vessel, said cable suspension system including at least one winch on said vessel, a cable wound on said winch and issuing therefrom, a reversing pulley connected to said suction nozzle whereby such reversing pulley is subject to an environment which is inherently dirty during dredging operation, said cable being trained over said reversing pulley and secured to said vessel whereby to present at least two cable portions extending from said vessel to said reversing pulley, guide pulley means carried by said vessel and over which said cable portions are trained to suspend said suction nozzle, further guide pulley means on said vessel for guiding and maintaining said cable portions in side-by-side relation; and
  • swell compensation means engaging said cable portions which are maintained in side-by-side relation by said further guide pulley means, for paying out and taking in said cable portions in unison as said vessel rises and falls due to wave action, whereby to move said cable relative to said guide pulley means only while obviating any significant movement of the cable over said reversing pulley.
  • a suction dredger system as defined in claim 1 including at least two reversing pulleys at said suction nozzle and a further reversing pulley on said vessel, said cable passing over one of said reversing pulleys at said suction nozzle back to and over said further reversing pulley and then back to and over the other reversing pulley at said suction nozzle and thence back to said vessel whereby to define two pairs of cable portions between the suction nozzle and the vessel, said further guide pulley means guiding and maintaining said two pairs of cable portions in side-by-side relation, and said swell compensating means engaging said two pairs of cable portions for paying them out and taking them in in unison as the vessel rises and falls.
  • said further guide pulley means comprises two sets of pulleys, one on either side of said swell compensation means.
  • a suction dredger system as defined in claim 4 including at least two reversing pulleys at said suction nozzle and a further reversing pulley on said vessel, said cable passing over one of said reversing pulleys at said suction nozzle back to and over said further reversing pulley and then back to and over the other reversing pulley at said suction nozzle and thence back to said vessel whereby to define two pairs of cable portions between the suction nozzle and the vessel.
  • said further guide pulley means guiding and maintaining said two pairs of cable portions in side-by-side relation, and said swell compensating means engaging said two pairs of cable portions for paying them out and taking them in in unison as the vessel rises and falls.
  • said further guide pulley means comprises two sets of pulleys, one on either side of said swell compen sation means.
  • a suction dredger system as defined in claim 8 including at least two reversing pulleys at said suction nozzle and a further reversing pulley on said vessel, said cable passing over one of said reversing pulleys at said suction nozzle back to and over said further reversing pulley and then back to and over the other reversing pulley at said suction nozzle and thence back to said vessel whereby to define two pairs of cable portions between the suction nozzle and the vessel.
  • said further guide pulley means guiding and maintaining said two pairs of cable portions in side-by-side relation, and said swell compensating means engaging said two pairs of cable portions for paying them out and taking them in in unison as the vessel rises and falls.
  • a suction dredger system as defined in claim 9 including a third reversing pulley on said nozzle and a second reversing pulley on said vessel, over both of which said cable is passed to form three pairs of cable portions all of which are engaged by said swell compensation means for movement in unison thereby.
  • a suction dredger system as defined in claim 7 including at least two reversing pulleys at said suction nozzle and a further reversing pulley on said vessel, said cable passing over one of said reversing pulleys at said suction nozzle back to and over said further reversing pulley and then back to and over the other reversing pulley at said suction nozzle and thence back to said vessel whereby to define two pairs of cable portions between the suction nozzle and the vessel, said further guide pulley means guiding and maintaining said two pairs of cable portions in side-by-side relation, and said swell compensating means engaging said two pairs of cable portions for paying them out and taking them in in unison as the vessel rises and falls.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Jib Cranes (AREA)
  • Earth Drilling (AREA)
  • Guides For Winding Or Rewinding, Or Guides For Filamentary Materials (AREA)
  • Wind Motors (AREA)
US437761A 1973-02-02 1974-01-30 Suction dredger with swell compensation Expired - Lifetime US3893249A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7301503.A NL158873B (nl) 1973-02-02 1973-02-02 Grondzuiger met een kabellengtevariator omvattende deiningscompensator.

Publications (1)

Publication Number Publication Date
US3893249A true US3893249A (en) 1975-07-08

Family

ID=19818137

Family Applications (1)

Application Number Title Priority Date Filing Date
US437761A Expired - Lifetime US3893249A (en) 1973-02-02 1974-01-30 Suction dredger with swell compensation

Country Status (7)

Country Link
US (1) US3893249A (nl)
BE (1) BE810382A (nl)
DE (1) DE2404897C3 (nl)
FR (1) FR2216399B1 (nl)
GB (1) GB1454132A (nl)
NL (1) NL158873B (nl)
ZA (1) ZA74625B (nl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4204347A (en) * 1977-03-08 1980-05-27 Ballast-Nedam Groep N.V. Device for cutting loose hard ground material
US4919393A (en) * 1988-02-01 1990-04-24 Mcdermott International, Inc. Deepwater subsea lowering/lifting system
US5285587A (en) * 1993-03-29 1994-02-15 Krenzler Leo M Underwater mining dredge
US20160107867A1 (en) * 2013-06-19 2016-04-21 Macgregor Norway As Load Handling Device and Method for Using the Same
WO2021099074A1 (en) * 2019-11-18 2021-05-27 Harwich Haven Authority Dredging method and apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL194554C (nl) * 1994-12-20 2002-07-02 Ihc Holland Nv Zuiginrichting die door middel van een zuigbuis met een baggervaartuig kan worden verbonden.

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US318859A (en) * 1885-05-26 Machine
US2984455A (en) * 1957-08-06 1961-05-16 California Research Corp Multiple-cable tensioning device
US3309065A (en) * 1965-08-24 1967-03-14 Rucker Co Transloader
US3343810A (en) * 1966-05-25 1967-09-26 Paul E Parnell Dynamic load compensation system
US3352540A (en) * 1964-07-07 1967-11-14 Wolff Maschinenfabrik Und Eise Drag-line winch
US3388070A (en) * 1967-02-23 1968-06-11 Abex Corp Method and apparatus for highline tension control
US3512281A (en) * 1966-11-28 1970-05-19 Mineraal Technologisch Inst Swell compensator for a drag suction dredger
US3530998A (en) * 1967-09-30 1970-09-29 Blohm Voss Ag Cargo loading device
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 (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US318859A (en) * 1885-05-26 Machine
US2984455A (en) * 1957-08-06 1961-05-16 California Research Corp Multiple-cable tensioning device
US3352540A (en) * 1964-07-07 1967-11-14 Wolff Maschinenfabrik Und Eise Drag-line winch
US3309065A (en) * 1965-08-24 1967-03-14 Rucker Co Transloader
US3343810A (en) * 1966-05-25 1967-09-26 Paul E Parnell Dynamic load compensation system
US3512281A (en) * 1966-11-28 1970-05-19 Mineraal Technologisch Inst Swell compensator for a drag suction dredger
US3388070A (en) * 1967-02-23 1968-06-11 Abex Corp Method and apparatus for highline tension control
US3530998A (en) * 1967-09-30 1970-09-29 Blohm Voss Ag Cargo loading device
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 (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4204347A (en) * 1977-03-08 1980-05-27 Ballast-Nedam Groep N.V. Device for cutting loose hard ground material
US4919393A (en) * 1988-02-01 1990-04-24 Mcdermott International, Inc. Deepwater subsea lowering/lifting system
US5285587A (en) * 1993-03-29 1994-02-15 Krenzler Leo M Underwater mining dredge
US20160107867A1 (en) * 2013-06-19 2016-04-21 Macgregor Norway As Load Handling Device and Method for Using the Same
US10087055B2 (en) * 2013-06-19 2018-10-02 Macgregor Norway As Load handling device and method for using the same
WO2021099074A1 (en) * 2019-11-18 2021-05-27 Harwich Haven Authority Dredging method and apparatus
AU2020385538B2 (en) * 2019-11-18 2022-03-03 Harwich Haven Authority Dredging method and apparatus
US11578472B2 (en) 2019-11-18 2023-02-14 Harwich Haven Authority Dredging method and apparatus
TWI841799B (zh) * 2019-11-18 2024-05-11 哈里奇港灣管理局 疏浚方法及設備及疏浚設備的用途

Also Published As

Publication number Publication date
AU6512374A (en) 1975-08-07
GB1454132A (en) 1976-10-27
FR2216399B1 (nl) 1978-10-13
FR2216399A1 (nl) 1974-08-30
ZA74625B (en) 1974-12-24
NL158873B (nl) 1978-12-15
BE810382A (nl) 1974-07-30
DE2404897A1 (de) 1974-08-15
NL7301503A (nl) 1974-08-06
DE2404897B2 (de) 1978-05-11
DE2404897C3 (de) 1979-01-11

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