US3631997A - Method of loading the hold of a vessel with dredging spoil - Google Patents

Method of loading the hold of a vessel with dredging spoil Download PDF

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Publication number
US3631997A
US3631997A US875650A US3631997DA US3631997A US 3631997 A US3631997 A US 3631997A US 875650 A US875650 A US 875650A US 3631997D A US3631997D A US 3631997DA US 3631997 A US3631997 A US 3631997A
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US
United States
Prior art keywords
hold
level
tube
sand
suspension
Prior art date
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
US875650A
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English (en)
Inventor
Jan De Koning
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.)
Nv Ingenieursbureau Voor Systemen En Octrooien Spanstaa
SPANSTAAL
Original Assignee
SPANSTAAL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SPANSTAAL filed Critical SPANSTAAL
Application granted granted Critical
Publication of US3631997A publication Critical patent/US3631997A/en
Anticipated expiration legal-status Critical
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
    • E02F3/907—Measuring or control devices, e.g. control units, detection means or sensors
    • 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

  • This invention relates to a method of loading the hold of a vessel with dredging spoil, in which a suspension of water and dredging spoil is admitted into the hold, even after the latter overflows, until the hold has been completely or substantially completely filled with dredging spoil.
  • pumps having a very high output are provided in order to reduce the loading time, so that the flow of the spoil through the openings situated at depth below the settled sand is not fast enough.
  • the object of the invention is to ensure that an adequate amount of spoil can be handled while reducing the amount of dredging spoil which flows overboard.
  • the invention provides a method of loading a hold of a vessel with dredging spoil, in which a suspension of water and dredging spoil is admitted into the hold after the hold overflows until the required amount of dredging spoil is situated in the hold, wherein the suspension is deposited in a tube which is so kept in the hold that it is surrounded by the hold on all sides, and which is kept at such a depth in the hold that the bottom of the tube always remains above the level of the settled part of the spoil, while the tube penetrates into the liquid.
  • the invention further provides a method of loading a hold, wherein said tube is drawn up as the hold fills with settled dredging spoil, care being taken to ensure that the bottom edge of said tube remains just above the settled dredging spoil.
  • Another preferred method according to the invention relates to the drawing up of the tube controlled in dependence on the load of the vessel.
  • the load may be picked up by load pickups, providing signals to a computing unit controlling operation means for raising the tube. This last method can be advantageously applied to vessels having a large hold and overflow means, so that a constant tonnage can be loaded.
  • the invention also improves a vessel having a hold for the transportation of dredging spoil so that it is specially adapted for performing the method according to the invention.
  • This vessel is characterized by a tube receiving the discharge pipe, said tube being open at the top and being surrounded by said hold on all sides, the space inside the tube communicating with the space of the hold, while the bottom edge of said tube has an adjustable depth in said hold.
  • the invention also provides an improved suction dredging installation, comprising a discharge pipe for filling at least one hold of a vessel, wherein the discharge pipe is provided with a tube which is connected to said discharge pipe and which can be so adjusted that the bottom edge of said tube penetrates into the liquid of said hold but remains above the settled dredging spoil of said hold, while the top of the tube communicates with atmosphere.
  • FIG. 1 is a diagrammatic side elevation of a preferred embodiment of a suction dredging installation according to the invention
  • FIGS. 2a and 2b are enlarged details of other preferred embodiments
  • FIGS. 3a and 3b are diagrammatic side elevations of preferred methods of filling barges.
  • the vessel 1 has a suction pipe 3 with a suction head 4 by means of which suspension of water with sand from the bed 12 is sucked up by a pump 5 and deposited into a tube 7 via the discharge pipe 6, said tube 7 being kept in the hold 2.
  • the advantage of the method according to the invention during filling of the hold 2 becomes apparent when the entire hold 2 has been filled with suspension 19, the suspension surface being indicated by reference 8.
  • the tube 7 is so kept in the hold 2 that it is surrounded by the hold 2 on all sides, the said tube 7 being kept at such a depth in the hold 2 that the bottom edge 18 of the tube 7 always remains above the level 10 of the settled part 20 of the spoil, while the bottom edge 18 of the tube 7 penetrates into the liquid 19.
  • the vessel 1 is provided with valves 9 for discharging the dredging spoil from the hold 2.
  • the tube 7 is suspended from the discharge pipe 6.
  • the discharge pipe 6 comprises a stationary part 6a, a swingable end part 6c communicating with said part 6a via a flexible tube part 6b and pivotably attached to said part 6a by means of hinges 16, a jack 13 operating the swinging movement of said end part 6c.
  • the bottom edge 18 moves from the position 18 upwards during swinging movement of end part 6c.
  • the tube part 7b of telescopic tube 7 is fixed rigidly to the tube 6.
  • the lower tube part 7a having a bottom edge 18 is telescopically slidable on said tube part 7b, a jack 13 operating the sliding movement of tube part 7a.
  • the height of the spoil level 10 in the hold can be determined accurately by load gauges and a computer unit. This will be explained with reference to FIG. 2a.
  • the load of the vessel is measured with a pressure pickup 22 arranged at the bottom of the suction dredger l and comprising a pressure-sensitive membrane 33, limiting a chamber 17 connected to the outboardwater 32.
  • the pressure pickup picks up the pressure corresponding with its depth in the outboardwater 32, which is a measure for the draught of the suction dredger l and the weight of the load.
  • the pressure pickup 22 provides signals to receiver 3I. From these signals the draught of the vessel 1 is determined in calculating unit 30 providing signals to the draught indicator 28.
  • the calculating unit 30 preferably also provides signals concerning the draught to the signal converter 29. This signal converter 29 provides signals to the control valves 27 for controlling the hydraulic jack 13 of tube 7.
  • the invention can also advantageously be applied to the filling of barges 15 by means of a suction dredger 14 as will be apparent from FIGS. 3a and 3b.
  • FIGS. 3a and 3b a barge 15 having a hold 2 is filled with a suspension of water and sand from the bed 12, which is sucked up by pump 5, a suction dredger 14 through a suction head 4 and suction pipe 3 and which is discharged through discharge pipe 6 into a tube 7.
  • a tube 7 consists of a tube part 7b connected to the barge 15 by means of studs 25 and of a slidable lower tube part 7a having a lower edge 18, a jack 13 operating the sliding movement of said tube part 7a.
  • the discharge pipe consists of a stationary pipe part 6a, a midpipe part 6b pivotably connected to pipe part 60 and an end pipe part 6c pivotably connected to pipe part 6b, jacks 13 operating the swinging movement of pipe parts 61; and 6c.
  • a tube 7 is fixed to end pipe part 6c.
  • the tube 7 communicates with atmosphere through the gap 26 between discharge pipe 6 and tube 7.
  • a method of depositing and rapidly settling sand in the hold of a vessel from a suspension of sand in water directed into the hold as a stream which comprises the steps of:
  • step (b) continuing the overflow filling of step (b) while raising the lower end of the tube to retain the aforesaid positioning thereof with respect to the rising level of settled sand until a selected quantity of sand has been settled in the hold.
  • the method according to claim 1 including the step of measuring the draught of the vessel and controlling the raising of the lower end of the tube in response to such measurement.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
US875650A 1968-11-15 1969-11-12 Method of loading the hold of a vessel with dredging spoil Expired - Lifetime US3631997A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6816373A NL6816373A (enrdf_load_stackoverflow) 1968-11-15 1968-11-15

Publications (1)

Publication Number Publication Date
US3631997A true US3631997A (en) 1972-01-04

Family

ID=19805169

Family Applications (1)

Application Number Title Priority Date Filing Date
US875650A Expired - Lifetime US3631997A (en) 1968-11-15 1969-11-12 Method of loading the hold of a vessel with dredging spoil

Country Status (5)

Country Link
US (1) US3631997A (enrdf_load_stackoverflow)
JP (1) JPS4929674B1 (enrdf_load_stackoverflow)
BE (1) BE741546A (enrdf_load_stackoverflow)
GB (1) GB1291494A (enrdf_load_stackoverflow)
NL (1) NL6816373A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245932A (en) * 1977-07-12 1981-01-20 Ingenieursbureau voor Systemen en Octrooien "Spanstaal" B. V. Suction dredger and method of loading the same
US4807373A (en) * 1987-05-08 1989-02-28 Sloan Pump Company, Inc. Loop circuit dredging apparatus
US4854058A (en) * 1987-05-08 1989-08-08 Sloan Pump Company, Inc. Dredging apparatus having a diver-operated hand-held dredge head for quasi-closed loop system
GB2309940A (en) * 1996-02-07 1997-08-13 Lim Tung Method and Apparatus for forming a dyke, dam or river bank from sludge
WO2000038975A1 (en) * 1998-12-23 2000-07-06 Pevatec As Loading and unloading of solid substance having high degree of water content
CN111636502A (zh) * 2020-06-15 2020-09-08 中交天航南方交通建设有限公司 一种基于绞吸挖泥船的采砂施工工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1708176A (en) * 1926-05-01 1929-04-09 Holly Pneumatic Systems Inc Apparatus and method for loading loose-bulk cargoes
US2215736A (en) * 1940-03-26 1940-09-24 Pennsylvania Railroad Co Bulk material handling
GB1111519A (en) * 1965-12-07 1968-05-01 Konink Mij Tot Het Uitvoeren V Process and apparatus for filling the hold of a ship with sand

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1708176A (en) * 1926-05-01 1929-04-09 Holly Pneumatic Systems Inc Apparatus and method for loading loose-bulk cargoes
US2215736A (en) * 1940-03-26 1940-09-24 Pennsylvania Railroad Co Bulk material handling
GB1111519A (en) * 1965-12-07 1968-05-01 Konink Mij Tot Het Uitvoeren V Process and apparatus for filling the hold of a ship with sand

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245932A (en) * 1977-07-12 1981-01-20 Ingenieursbureau voor Systemen en Octrooien "Spanstaal" B. V. Suction dredger and method of loading the same
US4807373A (en) * 1987-05-08 1989-02-28 Sloan Pump Company, Inc. Loop circuit dredging apparatus
US4854058A (en) * 1987-05-08 1989-08-08 Sloan Pump Company, Inc. Dredging apparatus having a diver-operated hand-held dredge head for quasi-closed loop system
GB2309940A (en) * 1996-02-07 1997-08-13 Lim Tung Method and Apparatus for forming a dyke, dam or river bank from sludge
WO2000038975A1 (en) * 1998-12-23 2000-07-06 Pevatec As Loading and unloading of solid substance having high degree of water content
US6575692B2 (en) 1998-12-23 2003-06-10 Pevatec As Method of unloading of solid substance having high degree of water content
CN111636502A (zh) * 2020-06-15 2020-09-08 中交天航南方交通建设有限公司 一种基于绞吸挖泥船的采砂施工工艺

Also Published As

Publication number Publication date
JPS4929674B1 (enrdf_load_stackoverflow) 1974-08-06
NL6816373A (enrdf_load_stackoverflow) 1970-05-20
BE741546A (enrdf_load_stackoverflow) 1970-05-12
GB1291494A (en) 1972-10-04
DE1957142A1 (de) 1970-05-21

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