US3329287A - Method and apparatus for suction unloading of sand barges - Google Patents

Method and apparatus for suction unloading of sand barges Download PDF

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Publication number
US3329287A
US3329287A US445395A US44539565A US3329287A US 3329287 A US3329287 A US 3329287A US 445395 A US445395 A US 445395A US 44539565 A US44539565 A US 44539565A US 3329287 A US3329287 A US 3329287A
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US
United States
Prior art keywords
sand
barge
suction
nozzle
suction nozzle
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
US445395A
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English (en)
Inventor
Koning Jan De
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.)
Ingenieursbureau voor Systemen en Octrooien Spanstaal BV
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Ingenieursbureau voor Systemen en Octrooien Spanstaal BV
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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
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9243—Passive suction heads with no mechanical cutting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/30—Conveying materials in bulk through pipes or tubes by liquid pressure
    • 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
    • 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

  • This invention relates to a method of suction-unloading at least one floating barge filled with sand or some other type of spoil, a washing medium being introduced into the barge and sand together with said washing medium being pumped as a suspension out of the barge to the required destination by means of at least one suction nozzle, the barge being displaced with respect to the suction nozzle during suction-unloading.
  • the present invention provides a still further developed method, which has the advantage that the suspension drawn in by the nozzle has a high sand concentration, while the barge is nevertheless completely or substantially completely emptied, this effect being achieved by the fact that a first part of the sand is pumped out of the barge to its destination in the form of a suspension having a high sand concentration, by means of a first suction nozzle, and the remainder of the sand is conveyed to a position near the first suction nozzle by means of a second suction nozzle.
  • the spilt sand which remains in the barge in the method according to the abovementioned proposal can nevertheless be sucked in, so that the method can be advantageously applied in every case, i.e., even if the distance covered by the barges is considerable.
  • the remainder of the sand in the same barge is being conveyed to the position near the first suction nozzle by means of the second suction nozzle.
  • the first part of the sand When a number of full barges are being successively suction-unloaded, it is preferable for the first part of the sand to be pumped from a specific barge to its destination by means of the first suction nozzle as hereinbefore described, and then for the remainder to be delivered from said barge to the next barge in the form of a washing medium while the first part of the sand from the next barge is being pumped to its destination in the form of a high-concentration suspension.
  • the invention also covers the novel suction-unloading installation specially adapted to the method of the invention.
  • the high sand concentration of the suspension which it is required to pump into the delivery pipe is controlled by pumping a quantity of suspension out of the smaller tank into the bottom of the large settling tank.
  • This known method is very complicated and in addition to four sand pumps requires two tanks, one of which is of enormous dimensions.
  • FIG. 1 is a diagrammatic top plan viiew of a barge suction-unloader, showing the known method in which a barge moving alongside the suction-unloader is unloaded;
  • FIG. 2 is a cross-section on the line I'III in FIG. 1, the suction-unloader being omitted;
  • FIG. 3 is a similar cross-section to FIG. 2, showing the first step of the method according to this invention
  • FIG. 4 is a similar cross-section to FIG. 2, showing the use of another method according to the invention.
  • FIGS. 5 and 6 are diagrammatic top plan views of a suction-unloading installation for the simultaneous unloading of two barges in accordance with two variants of the method according to the invention
  • FIGS. 7 and 8 are diagrammatic top plan views of a suction-unloading installation for the simultaneous unloading of two barges according to another variant of the method according to the invention, the valves in the two figures being shown in different positions;
  • FIG. 9 is a partial cross-section through a barge unloaded by suction according to yet another variant of the method according to the invention.
  • a suction unloader 1 comprising two water pipes 4 and 5 fed by a water pump 19, a nozzle 2 at the end of a suction pipe 3, and a sand pump 20 connected to the suction pipe 3, draws the sand from a barge 6 and conveys it to its destination via a delivery pipe 21 connected to the sand pump 20.
  • the barge 6 is hauled successive distances in the direction of the arrow 11 through the agency of a cable 8 which is partly wound on a driven winch 7 and which runs via a guide sheave 9 on the suction unloader to a bollard 10 on the barge, the mooring line 12 securing the barge 6 to the suction unloader 1 being paid out successively.
  • the nozzle 2 is held close to the gap 14.
  • the barge 6 is hauled continuously in order continuously to follow the gap 14 despite the fact that sand is continuously being sucked from and out of said gap, so that the suspension drawn in continuously has a high sand concentration.
  • this new method there is a considerably larger amount of spillage 18 behind the suction nozzle 2, but such spillage is not washed back with excess water as in the known method.
  • the barge 6 is filled with fine sand and the barge route is relatively short, it is more economic to leave the spilt sand in the barge 6 and return the barge only partly unloaded to the dredging site, than to transport the sand through the delivery pipe with an excess of water at the expense of a considerable power loss.
  • the barge is in any case not returned to the dredging site only partly unloaded.
  • the spilt sand 18 can in fact be very elegantly removed from the barge by sucking the same up as a suspension with, if necessary, a low concentration, by means of a second suction nozzle 22, and conveying it to close to the first suction nozzle 2 by means of a second sand pump 23 and a pipe 24.
  • This first suction nozzle 2 and the second suction nozzle 22 may be located in the same barge 1 as shown in FIG- URE 4 or the first suction nozzle 2a may be located in the one and the second suction nozzle 22a in the other of two barges described in connection with FIGURES through 8.
  • the spilt sand can be so conveyed indirectly, for example via the slope of the solid sand. In this way the suspension acts as a washing medium and the water supply via the pipe 4 can be reduced or stopped. In this way a high sand concentration is obtained in front of the sand suction nozzle 2.
  • the pipe 3 should be of a length such that any overflow from the suction pipe or the sand pump 20 in conjunction with the vacuum and the required concentration are at the correct level so that the required concentration cannot be exceeded.
  • the floating suction unloader 1a illustrated in FIG. 5 is intended for the performance of a more developed method according to the invention and is completed by a spud barge 25 both ahead and astern. Two mooring stages are thus provided for the barges 6a and 6b.
  • the suction unloader 1a Apart from the usual sand pump 20a, which pumps the sand to its destination by means of the suction nozzle 2a, suction pipe 3a containing the valve 29, and the delivery pipe 21a, and the usual water pump 19a which, when the valves 26, 27 and 28 are open can pump Water to the delivery pipe 21a, water pipe 5a and water pipe 5b respectively, the suction unloader 1a also includes a second sand pump 23a which can convey a suspension of water and sand from the barge 6b to the barge 6a by means of the second suction nozzle 22a and the pipe 24a.
  • the barges are unloaded by suction as follows: firstly, barge 6b is tied up to the suction unloader 1a in the position of barge 6a beneath the suction nozzle 2a and valve 27 is opened while water is pumped into the barge to act as a washing medium. The suction nozzle 2a is then lowered into the barge 6b, which is partly emptied as described in connection with FIG. 3, so that the spilt sand 18 remains in the barge because of the continuous dis placement of barge 6b with respect to nozzle 2a. The barge 6b and the still completely full barge 6a are subsequently tied up in the positions shown in FIG. 5 and respectively beneath the second and first suction nozzles 22a and 2a.
  • valve 29 is closed and valve 26 is opened to deliver water in the delivery pipe 21a to maintain conveyance in said pipe.
  • valve 28 is opened to supply water to barge 6b, the spillage sand 18 is delivered to barge 6a by means of the second suction nozzle 22a, pump 23a and pipe 24a, and the sand from barge 6a is pumped to its destination, through the agency of nozzle 2a, suction pipe 3a, sand pump 20a and delivery pipe 21a, in the form of a high-concentration suspension, by the barges 6b and 6a being moved at a speed such that the suction nozzle 2a is continuously situated in a high-concentration suspen- SlOIl.
  • the barge 6b must be moved at a constant speed if the barges 6a and 6b are situated fairly close together, to avoid obstruction of barge 6a by barge 6b.
  • the two barges may for example be secured to a single haulage system.
  • the suction nozzles 2a and 22a may be disposed far apart or on either side of the suction unloader if the barges 6a and 6b are required to be displaced at independent speeds.
  • the suction unloader 1a is situated in the Water at such a distance from the quay that barges 6 can be tied up on each side.
  • four mooring stations 32 are thus created for barges 6, stations 32a and 32a being the same in principle as station 32a, while stations 32b and 32b" are the same as station 32b in FIG. 5.
  • valves 29' and 29" With the valves 29' and 29" open, the sand pump 20a and the suction nozzles 2a and 2a" respectively can draw sand in a high concentration from the barges 6 at the respective stations 32a and 32a", while in the latter barges, with the valves 30a and 30a" respectively open, and depending upon whether the valves 30b and 30b" are open or closed, washing water together with spillage sand can be conveyed out of the barges 6 at the respective stations 32b and 32b by means of the said pump 23a and the respective nozzles 22a and 22a".
  • the spillage sand may or may not be pumped over crosswise.
  • the suction unloader shown in FIGS. 7 and 8 has a mooring station 320 on each side, such station being arranged in the same way as station 32 in FIG. 5.
  • the connection of the sand suction nozzles 2c, sand pumps 200, water pump 19c, pipes 240 and delivery pipe 21 is variable through the agency of a number of valves, as shown in FIGS. 7 and 8.
  • the identical sand pumps 20c are each driven by a separate electric motor (not shown), the two motors being supplied with current by a single generator (not shown).
  • the pipe 24 leading from the second suction nozzle 22 to the first suction nozzle 2 need not necessarily contain a sand pump 23. If the second suction nozzle 22d has its pipe 24d connected to the first suction nozzle 2d (see FIG. 9), the normal sand pump 20 will draw in a considerable amount of sand through the first suction nozzle 2d and a relatively considerable amount of water through the second nozzle 22d. If the barge 6 is drawn along too rapid- 1y, a large plug of sand will form in the first nozzle 2d so that the resistance in the latter increases and more suspension is drawn in by the second nozzle 22d. This suspension containing a relatively low concentration of sand then dissolves sand from the top part of the first suction nozzle 2d.
  • a valve 31 may be provided in pipe 24d and/ or in the first suction nozzle 2d. A suitable place for this valve 31 is, for example, the
  • barge 6' After insertion of the suction nozzle 2, barge 6' can immediately be hauled along with respect to this nozzle, because the sand sticking to the leading edge 17 behind the nozzle 2 is sucked in by the second suction nozzle which is subsequently introduced into the barge 6'.
  • a method of suction-unloading at least one float ng barge filled with sand or the like comprising the steps of:
  • the initial pumping operation of the first nozzle being of a suspension containing a high ratio of sand to pumping medium
  • a method of suction-unloading a plurality of floating barges filled with sand or the like comprising the steps of:
  • the initial pumping operation of the first nozzle of each barge being of a suspension consisting of a high ratio of sand to pumping medium
  • the actions of the second nozzles are performed simultaneously with the actions of the first nozzles.
  • the advance of the barges with respect to one another is continuous and is synchronized with the action of the respective suction nozzles.
  • Apparatus for the suction-unloading of floating barges filled with sand or the like comprising:
  • washing pump having an inlet connected to a source of washing medium and an outlet;
  • a first sand pump having an inlet and an outlet leading to a sand accumulation region
  • a first suction nozzle connected to the inlet of said first sand pump
  • a discharge nozzle connected to the outlet of said washing pump and disposed to direct washing medium against a mass of sand within a barge at a point adjacent said first suction nozzle;
  • a second sand pump having an inlet and an outlet; 21 second suction nozzle connected to the inlet of said second sand pump and disposed to draw sand suspended in washing medium from a barge remote from said first suction nozzle; and
  • a second discharge nozzle connected to the outlet of said second sand pump and disposed to discharge sand suspended in washing medium against a mass of sand adjacent said first suction nozzle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Ship Loading And Unloading (AREA)
US445395A 1964-04-07 1965-04-05 Method and apparatus for suction unloading of sand barges Expired - Lifetime US3329287A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6403663A NL6403663A (enrdf_load_stackoverflow) 1964-04-07 1964-04-07

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US3329287A true US3329287A (en) 1967-07-04

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Application Number Title Priority Date Filing Date
US445395A Expired - Lifetime US3329287A (en) 1964-04-07 1965-04-05 Method and apparatus for suction unloading of sand barges

Country Status (5)

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US (1) US3329287A (enrdf_load_stackoverflow)
BE (1) BE661976A (enrdf_load_stackoverflow)
DE (1) DE1634902A1 (enrdf_load_stackoverflow)
GB (1) GB1054504A (enrdf_load_stackoverflow)
NL (2) NL6403663A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB531753I5 (enrdf_load_stackoverflow) * 1974-12-11 1976-03-02
US4354778A (en) * 1978-10-30 1982-10-19 Shell Oil Company Waterfall technique for removing settled coal solids from a storage facility
JP2013173468A (ja) * 2012-02-27 2013-09-05 Kurimoto Ltd アンローディングシステム
WO2014133462A1 (en) * 2013-03-01 2014-09-04 Riverton Group (S) Pte. Ltd. Unloading system for sand and the method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3407475C2 (de) * 1984-02-29 1995-08-31 Plochingen Neckarhafen Verfahren zur Aufbereitung von aus Gewässern gefördertem angeschwemmten Erdmaterial

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US512865A (en) * 1894-01-16 Earth
US1012196A (en) * 1910-06-01 1911-12-19 Otto Fruehling Apparatus for discharging dredge-hoppers and the like.
US1337279A (en) * 1918-05-06 1920-04-20 Jacob R Sensibar Method of and apparatus for collecting and delivering sand

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US512865A (en) * 1894-01-16 Earth
US1012196A (en) * 1910-06-01 1911-12-19 Otto Fruehling Apparatus for discharging dredge-hoppers and the like.
US1337279A (en) * 1918-05-06 1920-04-20 Jacob R Sensibar Method of and apparatus for collecting and delivering sand

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB531753I5 (enrdf_load_stackoverflow) * 1974-12-11 1976-03-02
US3988843A (en) * 1974-12-11 1976-11-02 The International Nickel Company, Inc. Mining transition chamber
US4354778A (en) * 1978-10-30 1982-10-19 Shell Oil Company Waterfall technique for removing settled coal solids from a storage facility
JP2013173468A (ja) * 2012-02-27 2013-09-05 Kurimoto Ltd アンローディングシステム
WO2014133462A1 (en) * 2013-03-01 2014-09-04 Riverton Group (S) Pte. Ltd. Unloading system for sand and the method thereof

Also Published As

Publication number Publication date
NL125627C (enrdf_load_stackoverflow)
BE661976A (enrdf_load_stackoverflow) 1965-08-02
GB1054504A (enrdf_load_stackoverflow)
NL6403663A (enrdf_load_stackoverflow) 1965-10-08
DE1634902A1 (enrdf_load_stackoverflow) 1970-07-23

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