US3881530A - Plant for evacuating dredged material - Google Patents

Plant for evacuating dredged material Download PDF

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Publication number
US3881530A
US3881530A US347373A US34737373A US3881530A US 3881530 A US3881530 A US 3881530A US 347373 A US347373 A US 347373A US 34737373 A US34737373 A US 34737373A US 3881530 A US3881530 A US 3881530A
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United States
Prior art keywords
lighter
pump
plant
discharge
discharge connection
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Expired - Lifetime
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US347373A
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English (en)
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Giovanni Faldi
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EPI SpA
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Individual
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Assigned to EPI SOCIETA PER AZIONI reassignment EPI SOCIETA PER AZIONI ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FALDI, GIOVANNI
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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
    • E02F3/8833—Floating installations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/28—Barges or lighters
    • B63B35/30—Barges or lighters self-discharging
    • B63B35/303—Barges or lighters self-discharging discharging by suction, pressing or washing
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/04—Loading devices mounted on a dredger or an excavator hopper dredgers, also equipment for unloading the hopper

Definitions

  • ABSTRACT A plant for evacuating dredged material is disclosed, according to which the dredged material, in form of aqueous suspension of high solid content, is loaded into transporting lighters, of the type comprising a closed loading cavity, having an upper loading inlet and a lower discharge connection, and the lighters shuttle between the dredging apparatus and a flow floating station, provided with at least a pneumatic pump, per se known, and with means for connecting the intake duct of said pump with said discharge connection of the lighter.
  • the present invention relates to a plant for discharging and transporting to a distance refuse material of semi-solid or pulp form, particularly suitable for material dredged from submerged beds.
  • Dredging plants exist (the subject of previous patents and patent applications by the same applicant), mounted on pontoons and consisting of pumping units provided with dredging shovels which are submerged, the dredging shovels of which engage with the bed, disaggregating it and conveying the material towards pumping chambers or cylinders operating by compressed air, and from which the material mixed with water is conveyed to the surface by means of a flow pipe.
  • the main advantage of these dredging plants is the flexibility of application, both in terms of the depth of dredging and of the type of bed dredged, plus a high dredging efficiency and a reduced water content of the dredged material.
  • Flow plants are also known, and constitute the subject of a previous patent application by the same applicant, in which pneumatic pumps of the same type as the aforementioned are used in combination with loading tanks for conveying to a distance material in the form of an aqueous suspension of high solid content. These plants are particularly useful for conveying to a distance industrial waste, and for example for the reclaiming of beaches and the like.
  • a plant for conveying and discharging at a distance dredged material in the form of an aqueous suspension in which the dredged material is loaded into distance transporting lighters, of the closed type, characterised in that it comprises a floating flow station provided with a plurality of pneumatic flow pumps, the inlet pipe of each pump being arranged for removable connection to the outlet of a transporting lighter suitable for shuttling between the dredging plant and said flow station, further characterised in that said lighter, provided or not provided with autonomous drive means, comprises a completely closed loading cavity in which an upper aperture is provided for loading the dredged material, and a discharge connection situated on the bottom at one end of said cavity, in which there are also provided means for conveying to said connection the dredged material which fills the cavity of the lighter, and from there by way of a flexible pipe to said inlet pipe.
  • said means for conveying the dredged material which fills the loading cavity of the lighter consist of a conveying shovel mobile within the cavity from a position at the end of the lighter furthest from said end in which said discharge connection is formed, to this latter end of said cavity.
  • said conveying means consist of a header situated inside said cavity along its longitudinal axis, said header comprising a plurality of apertures distributed along its axis such as to allow the gradual discharge of the dredged material, one end of said header being connected to said discharge connection.
  • the flow station is characterised, besides the submerged flow pump, also by comprising a mooring system for the lighters, provided with fixed mooring points for disposing the lighter and in particular its discharge connection in a predetermined required position with respect to the submerged pump, and also in that means are provided for bringing the inlet pipe of the submerged pump into tight communication with the discharge connection of the lighter.
  • One of the main advantages of the present invention lies in the fact that it is possible to convey the dredged material away from the dredging zone with minimum transportation costs by lighters, and transporting a minimum quantity of superfluous water, since the concentration of solids in the dredged material transported by the lighters and pumped by the flow station can reach
  • a further similarly important advantage is that by this system, the dredged material passes from the dredging pump to the discharge zone without any loss, and hence if it should be polluted any repollution is consequently avoided.
  • a further advantage is that the mooring and discharge operations of the lighters at the flow station are facilitated and made rapid, independently of the conditions of the sea, lake, river and the like.
  • FIG. 1 is a schematic view of the plant according to the present invention.
  • FIG. 2 is an analogous view of the plant in the working stage
  • FIG. 3 is a view of a detail of a possible variation
  • FIGS. 4 and 5 are a frontal and lateral schematic view respectively of the particular embodiment of the flow station for the mooring and discharge of the lighters loaded with dredged material, of which FIG. 6 shows a variation.
  • FIG. 1 shows the essential parts of the plant according to the present invention, i.e. the transporting lighter B and the pumping station P.
  • This latter comprises a floating pontoon 10 on which are mounted the air compressor and distributor 12 for the operation of the submerged pumping unit 13.
  • This latter suspended by a cable 16 from a support arm 14, comprises a plurality of pneumatic pumping chambers or cylinders (normally three in number) to which, according to a sequence determined by the distributor 12 of known type, compressed air arrives through the pipe 17, whereas the pipes 18 and 19 constitute the inlet and discharge respectively for the dredged material.
  • the floating pontoon or platform P may comprise a plurality of submerged pumping units 13, according to the capacity of the plant and especially of the hourly capacity of the dredging section.
  • this comprises a hull 21 with an internal cavity 22 for filling with the dredged material 23, closed upperly by a cover or bridge 24 comprising a funnel loading mouth 25 (possibly closable by a gate valve) so as to avoid the emergence of polluting gases which are released from the dredged material.
  • a flanged discharge connection 26 to which a flexible pipe 27 is connected, its free end being suspended in an adjustable manner by means of a cable 28 from a raising arm 29 mounted on the bridge 24.
  • a conveying shovel 30 mobile along the longitudinal axis of the lighter by means of dragging cables 31 passing around intermediate pulleys 32 and driven by the winch 33. Return cables 34 are driven by the winch 35.
  • the front surface of the shovel 30 is shaped so as to cause the dredged material 23 to be conveyed towards the discharge connection 26.
  • the material 23 may reach a solid content of up to 85%, a figure which enables the advantage attained by the present invention to be completely appreciated.
  • Suitable sliding guides are provided for the sliding of the shovel 30. Any equivalent solution may also be provided, for example the discharge connection 26 in a central position and two symmetrical shovels which approach from the ends towards the centre.
  • any analogous system for example a system with pneumatic or hydraulic pistons, may be employed for pushing the shovel 30 during the discharge stage of the dredged material 23.
  • FIG. 3 shows a variation concerning essentially the lighter and useful in those cases in which the dredged material has a less high solid content and hence a considerably lower viscosity.
  • a pipe or header 36 is fitted provided with apertures 37 through which the dredged and fairly fluid material passes by gravity into the pumping cylinders of the pneumatic pumping station P.
  • the discharge pipe connected to the discharge connection of the lighter must be connected to the inlet pipe of the submerged flow pump.
  • This system has the advantage of flexibility and rapidity of transfer from one place of work to another, jointly with the movements of the actual dredging plant, but in practice a certain time may be necessary for connecting the two sections of pipe, as they are normally of a certain size and hence not easily manageable, especially under rough sea conditions.
  • the purpose of the modification shown in FIGS. 4 and 5 is to make the connecting operations much more rapid, even though it requires a more complex and preferably fixed installation, which is however economically justified in the case of work of a certain size, because of the saving in time, the saving of labour and the possibility of removing the connecting operation from dependence on the ability of the operators.
  • the principle on which the system shown in FIGS. 4 and 5 is based is that of providing mooring points for the lighters so that they are always in the correct position with respect to the submerged flow pump.
  • the lighter 21 has its discharge connection 26 controlled by a discharge valve 50 (in its turn controlled hydraulically, pneumatically or manually), provided with a wide flange 51 against which the flat flange 52 complete with a rubber seal gasket 53, and at which the inlet pipe 18 of the submerged pump 13 finishes, is tightly fitted.
  • the flange 52 constitutes the final part of a funnel connection 54 to which the pipe 18 is generally coaxially fixed.
  • the funnel connection 54 is in its turn rigid with an annular floating element 55, preferably a tubular ring full of air and having such a volume as to guarantee the tendency of the entire assembly (tubular ring, funnel and inlet pipe of the pump) to float.
  • the floating tubular element is anchored at the bottom by a set of four cables 56 controlled by way of intermediate pulleys 57 by four synchronised drums 58 or a single winch with four drums.
  • Both the pulleys S7 and winches 58 are mounted either on two palisade structures 59, preferably of the type comprising foundation piles 60 sunk into the bed and supporting the platfonns 61, which also support the other equipment necessary both for the operation of the submerged pump (motor driven compressor, distributor etc.) and for its raising and lowering (for example shears and cable) or on two pontoons provided with retractable legs resting on the marine bed.
  • the palisade structure or pontoons 59 form a corridor of predetermined dimensions into which one or more lighters enter one after the other and moor in a precise predetermined central position with respect to the floating assembly comprising tubular ring, funnel and flange.
  • the lighter When the lighter arrives in the discharge zone it is directed by its own means or is pushed into the corridor formed between the two palisade structures until it strikes against a point of arrest previously constructed (indicated by the reference numeral 62) so giving the assurance that the discarge connection 26 and relative plate 51 lie in a position corresponding with the funnel which tends to rise by the action of the floating tubular ring full of air. Any slight differences may be neglected in that the funnel has an inlet mouth of much greater diameter than the diameter of the discharge connection of the lighter.
  • the floating assembly (floating tubular ring, pipe and funnel) will be anchored below the bottom of the lighter when it arrives, by the set of cables 56.
  • the raising winch is operated so as to enable the inlet pipe of the pump to be raised and hence the terminal cone or funnel by the action of the floating tubular ring until the plate of the cone rests with its rubber gasket on the plate surrounding the discharge pipe positioned on the bottom of the lighter.
  • the floating tubular ring automatically maintains the contact between the cone and discharge tube by rising, so avoiding any dispersion of material, which may be polluted, into the zone where the work is carried out.
  • the lighter may be immediately re-transported back to the dredging plant.
  • one of the systems described hereinafter may be applied in order to facilitate unloading, or water may be added by a suitable pump.
  • the corridor which has been described as formed from palisade structures may also be constructed in the form of two or a series of strong pontoons provided with retractable legs for resting on the bed or from pontoons firmly anchored, but this system is less practical in the case of zones with large tide differences, because it requires the continual variation of the length of the cables fixing the pipes which would have to maintain a perfectly rigid corridor for the entry of the lighters.
  • FIG. 6 shows diagrammatically the modification in which instead of a corridor a mooring pontoon is pro vided, to which the lighters to be discharged are brought alongside.
  • FIG. 6 can be more practical and more easily adaptable even in the case of open sea, especially using pontoons with retractable legs, because it avoids disturbances due to the difference in level of the tide, and the need to construct fixed works which are difficult to recover, and further it enables very rapid dislocation both at the beginnig and at the end of the work in the case of a sea storm.
  • pontoons With a suitable system for raising the conveyed pump body and the relative floating and conveying equipment so that it may be raised without altering the profile of the watercraft in the water and hence without hindrance to its movement.
  • a further solution especially for lighters which are not self-propelled and which would enable one or more lighters to be easily towed by a single tug, or with a further tug at the rear in the case of a number of lighters, and which facilitates a more rapid mooring is represented by one or more pontoons in a row so as to construct a quay, moored either by means of anchorages or on retractable legs resting on the bed, in which the pump body and the systems for raising the floating tubular ring to be applied to the bottom of the lighter are firmly supported by the pontoons.
  • the present invention provides an excellent solution to the problem of eliminating dredged material, especially enabling the wasteful transport and flow of large quantities of water to be avoided and reducing considerably the shuttle times of the lighters.
  • a plant for conveying and discharging at a distance dredged material in the form of an aqueous suspension, in which the dredged material is loaded into lighters at a dredging station for transport to a distance characterized in that said plant comprises a floating flow pumping station provided with at least one and preferably a plurality of submerged pneumatic flow pumps, having, respectively, a plurality of inlet pipes at least one transporting lighter selectively operatively connected to or disconnected from said floating flow pumping station, said transporting lighter having a discharge connection, the inlet pipe of each pump being removably connected to the discharge connection of the transporting lighter arranged for shuttling between the dredging station and said floating flow pumping station, further characterized in that said lighter, provided preferably with its own drive means, comprises a completely closed loading cavity with an upper aperture for receiving the dredged material and a discharge aperture situated in the bottom of the cavity, said discharge aperture being arranged for connection by way of said discharge connection to said flow pump inlet pipe in said floating station,
  • said mooring corridor comprises palisade elements anchored to the bed of a body of water and supporting two platforms on which the necessary equipment for the operation of the submerged pump is mounted.
  • a plant as claimed in claim 2, in which said means which ensure that the funnel part floats consist of an annular tube element suitable for filling with air, cables fixed to said tube element and operatively connected to synchronised members mounted on said platforms and by which said float may be pulled downwards by said synchronised members.
  • said mooring corridor comprises two or more floating pontoons provided with telescopic legs for resting on the bed of a body of water so as to make the entire assembly stable, said pontoons being adapted to support equipment associated with said pump.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Pipeline Systems (AREA)
  • Ship Loading And Unloading (AREA)
  • Fertilizing (AREA)
US347373A 1972-05-17 1973-04-03 Plant for evacuating dredged material Expired - Lifetime US3881530A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT24498/72A IT956280B (it) 1972-05-17 1972-05-17 Impianto di evacuazione di materiale dragato

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JP (1) JPS5019855B2 (en))
AR (1) AR205690A1 (en))
CA (1) CA979840A (en))
CH (1) CH574020A5 (en))
DE (1) DE2316763A1 (en))
ES (1) ES414263A1 (en))
FR (1) FR2184616B1 (en))
GB (1) GB1425344A (en))
IL (1) IL42287A (en))
IT (1) IT956280B (en))
SE (1) SE400795B (en))
ZA (1) ZA732240B (en))

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307525A (en) * 1979-08-16 1981-12-29 Amtec Development Company Pneumatic-hydraulic pump dredge
US4321720A (en) * 1978-01-17 1982-03-30 Odd Havre Method of transferring a fluid from a station on the sea bed to a vessel, or vice-versa, and a means and a vessel for carrying out the method
US4353174A (en) * 1980-08-11 1982-10-12 Amtec Development Company Electronic control system for pneumatic-hydraulic pump dredge
US4753554A (en) * 1978-07-28 1988-06-28 Westinghouse Electric Corp. Submerged flexible piping system with neutral buoyancy
US5042178A (en) * 1990-04-13 1991-08-27 Dutra Bill T Apparatus and process for solid dredge material disposal
DE4108161A1 (de) * 1991-03-14 1992-09-17 Muesing Anton Gmbh Co Kg Loeschsystem zum loeschen des baggergutes eines baggerschiffes und eine leitungsfuehrung, vorzugsweise als bestandteil eines loeschsystems
US5381751A (en) * 1993-11-17 1995-01-17 Oceaneering Technologies, Inc. Transportation and discharge of waste to abyssal depths
NL2000090C2 (nl) * 2006-06-07 2007-12-11 Oord N V Van Werkwijze en vaartuig voor het aanwinnen van land.
US20120128449A1 (en) * 2010-11-22 2012-05-24 Halliburton Energy Services, Inc. Proppant Transfer System
US20160159439A1 (en) * 2014-12-08 2016-06-09 HiLoad LNG AS Method and System for Cargo Fluid Transfer at Open Sea
US9482060B2 (en) 2014-07-29 2016-11-01 Susanne F Vaughan Adjustable conduit
CN108222106A (zh) * 2018-02-01 2018-06-29 丁建兵 一种河道清污装置及其清污方法
US20240254723A1 (en) * 2023-01-30 2024-08-01 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use
US12241223B2 (en) 2023-01-30 2025-03-04 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use
US12264453B2 (en) 2023-01-30 2025-04-01 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use
US12305358B2 (en) 2023-01-30 2025-05-20 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367298A (en) * 1965-08-25 1968-02-06 Dredging Ind Aust Pty Ltd Bottom dump hopper barge
US3426715A (en) * 1967-08-29 1969-02-11 Valentino L Balbi Refuse disposal system and apparatus
US3528462A (en) * 1968-03-04 1970-09-15 Underwater Storage Inc Sewage disposal
US3595278A (en) * 1969-09-11 1971-07-27 North American Rockwell Transfer system for suboceanic oil production

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367298A (en) * 1965-08-25 1968-02-06 Dredging Ind Aust Pty Ltd Bottom dump hopper barge
US3426715A (en) * 1967-08-29 1969-02-11 Valentino L Balbi Refuse disposal system and apparatus
US3528462A (en) * 1968-03-04 1970-09-15 Underwater Storage Inc Sewage disposal
US3595278A (en) * 1969-09-11 1971-07-27 North American Rockwell Transfer system for suboceanic oil production

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321720A (en) * 1978-01-17 1982-03-30 Odd Havre Method of transferring a fluid from a station on the sea bed to a vessel, or vice-versa, and a means and a vessel for carrying out the method
US4753554A (en) * 1978-07-28 1988-06-28 Westinghouse Electric Corp. Submerged flexible piping system with neutral buoyancy
US4307525A (en) * 1979-08-16 1981-12-29 Amtec Development Company Pneumatic-hydraulic pump dredge
US4353174A (en) * 1980-08-11 1982-10-12 Amtec Development Company Electronic control system for pneumatic-hydraulic pump dredge
US5042178A (en) * 1990-04-13 1991-08-27 Dutra Bill T Apparatus and process for solid dredge material disposal
DE4108161A1 (de) * 1991-03-14 1992-09-17 Muesing Anton Gmbh Co Kg Loeschsystem zum loeschen des baggergutes eines baggerschiffes und eine leitungsfuehrung, vorzugsweise als bestandteil eines loeschsystems
US5381751A (en) * 1993-11-17 1995-01-17 Oceaneering Technologies, Inc. Transportation and discharge of waste to abyssal depths
NL2000090C2 (nl) * 2006-06-07 2007-12-11 Oord N V Van Werkwijze en vaartuig voor het aanwinnen van land.
US20120128449A1 (en) * 2010-11-22 2012-05-24 Halliburton Energy Services, Inc. Proppant Transfer System
US8882428B2 (en) * 2010-11-22 2014-11-11 Halliburton Energy Services, Inc. Proppant transfer system
US9482060B2 (en) 2014-07-29 2016-11-01 Susanne F Vaughan Adjustable conduit
US20160159439A1 (en) * 2014-12-08 2016-06-09 HiLoad LNG AS Method and System for Cargo Fluid Transfer at Open Sea
US9902471B2 (en) * 2014-12-08 2018-02-27 HiLoad LNG AS Method and system for cargo fluid transfer at open sea
CN108222106A (zh) * 2018-02-01 2018-06-29 丁建兵 一种河道清污装置及其清污方法
CN108222106B (zh) * 2018-02-01 2020-06-16 江苏国盛华清环保科技有限公司 一种河道清污装置及其清污方法
US20240254723A1 (en) * 2023-01-30 2024-08-01 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use
US12241223B2 (en) 2023-01-30 2025-03-04 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use
US12264453B2 (en) 2023-01-30 2025-04-01 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use
US12270180B2 (en) * 2023-01-30 2025-04-08 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use
US12305358B2 (en) 2023-01-30 2025-05-20 Sonny's Hfi Holdings, Llc Pneumatic excavator and methods of use

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Publication number Publication date
JPS4955138A (en)) 1974-05-29
IT956280B (it) 1973-10-10
SE400795B (sv) 1978-04-10
CA979840A (en) 1975-12-16
IL42287A (en) 1976-08-31
AU5425073A (en) 1974-10-10
CH574020A5 (en)) 1976-03-31
IL42287A0 (en) 1973-07-30
FR2184616A1 (en)) 1973-12-28
ES414263A1 (es) 1976-01-16
AR205690A1 (es) 1976-05-31
GB1425344A (en) 1976-02-18
DE2316763A1 (de) 1973-11-29
JPS5019855B2 (en)) 1975-07-10
ZA732240B (en) 1974-01-30
FR2184616B1 (en)) 1977-02-04

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Owner name: EPI SOCIETA PER AZIONI, VIA DELLA CUPOLA 243-5-7,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FALDI, GIOVANNI;REEL/FRAME:003842/0356

Effective date: 19810303