EP0000417B1 - Suction dredger and method of loading the same - Google Patents
Suction dredger and method of loading the same Download PDFInfo
- Publication number
- EP0000417B1 EP0000417B1 EP78200091A EP78200091A EP0000417B1 EP 0000417 B1 EP0000417 B1 EP 0000417B1 EP 78200091 A EP78200091 A EP 78200091A EP 78200091 A EP78200091 A EP 78200091A EP 0000417 B1 EP0000417 B1 EP 0000417B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hold
- suction dredger
- loading
- sand
- effluent
- 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
Links
Images
Classifications
-
- 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
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F7/00—Equipment for conveying or separating excavated material
- E02F7/06—Delivery chutes or screening plants or mixing plants mounted on dredgers or excavators
- E02F7/065—Delivery chutes or screening plants or mixing plants mounted on dredgers or excavators mounted on a floating dredger
Definitions
- the invention relates to a method of loading a suction dredger in which a suspension of sand and water is pumped into the hold of the suction dredger during a loading operation which is carried out in at least two steps, to wit
- the invention relates to and provides, in addition, a suction dredger for carrying out the method in accordance with the invention, said dredger comprising a hold, a pump for pumping a suspension of sand and water into the hold and effluent means to be set in a first loading step at a high level corresponding to the maximum volume of the hold and in a second loading step at a tower level, the proportions of the hold volume being such that in a first step the suction dredger can be loaded with the sand and water mixture substantially up to its maximum permissible carrying capacity, there being provided control-means for bringing the effluent means to lower and lower levels in dependence upon loading measuring means during the second loading step, said dredger being characterized in that said control-means are adapted to lower the effluent means intermittently in steps.
- Figure 1 is a schematic longitudinal sectional view of a preferred embodiment of a suction dredger in accordance with the invention in carrying out the method according to the invention
- Figures 2 and 3 are each a graph representing the volume of the hold and the weight of the load respectively, when the method according to the invention is carried into effect.
- the suction dredger 1 shown in Figure 1 is a trawl dredger especially equipped for carrying out the method in accordance with the invention.
- the suction dredger 1 comprises a hold 3 in a hull 2, a pump 4 for pumping a suspension of sand and water into the hold 3 and effluent means 9.
- the pump 4 communicates at one end with a suction pipe 5, a trailing suction head 10 of which is dragged on along the ground 11 below the water 12, when the suction dredger 1 is propelled in the direction of the arrow 14 by means of a propeller 13.
- the pump 4 communicates with a loading pipe 6, from which the water and sand suspension gets into the hold 3.
- the effluent means 9 comprise a vertical, fixed tube 15 communicating with the water 12, a tube 8 vertically displaceable in the former and having at the top end an overflow dish 7 and a hydraulic cylinder 16, the piston rod 17 of which is connected with the dish 7 for the vertical adjustment of the overflow rim 18 of the overflow dish 7.
- the hold 3 has very large proportions as compared with the carrying capacity of the suction dredger 1, that is to say, the hold 3 can be filled with sand only up to the level Z,,,.
- the loading operation is performed in at least two steps 21 and 22 (see Figures 2 and 3).
- the overflow rim 18 is held in its highest position 18"' indicated in Figure 1 by broken lines, at least at such a high level that the hold 3 is loaded essentially up to its maximum volume 19 and up to the maximum carrying capacity 20 of the suction dredger 1 with a suspension of sand and water pumped into the hold 3.
- the graphs drawn in broken lines represent the volume V t and the weight W, respectively of the total quantities of sand and water contained in the hold 3
- the solid lines V s and W s represent the volume and the weight respectively of sand settled down in the hold 3.
- second step 22 is carried out, in which additional suspension is pumped into the hold 3 and in which the effluent means are lowered in dependence upon the weight of the load in the hold 3 to an extent such that the suction dredger 1 remains essentially loaded up to its maximum permissible carrying capacity 20.
- the graph W t indicated by broken lines extends substantially horizontally along the dotted line 23. This dotted, straight line 23 and the naturally varying dotted line 24 of Figure 2 would be attained, if the overflow rim 18 were gradually lowered. According to the invention, however, the overflow rim 18 is lowered intermittently rather than gradually.
- the effluent means 9 comprise a control-rod 26 with a head 27, which moves along pulse generators 28 during the upward and downward movements of the overflow rim 18.
- the pulse generators 28 correspond each to, a level of the overflow rim 18, where it is retained for some time.
- the suction dredger 1 In order to maintain the suction dredger 1 essentially loaded up to its maximum permissible carrying capacity 20, it is equipped with a draught gauge 29, from which a signal is applied to a comparator 30, in which a value of the maximum permissible carrying capacity is set.
- the comparator 30 applies a pulse to a control-means 31 of a hydraulic valve 32, which governs the fluid flow to and from both ends of the hydraulic cylinder 16.
- the overflow dish 7 then moves down by one level difference until the head 27 of the rod 26 reaches a pulse generator 28, which applies a pulse to a control-member 33 for setting the control-valve 32 in a stop position in order to prevent the overflow dish 7 from moving further downwards.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Description
- The invention relates to a method of loading a suction dredger in which a suspension of sand and water is pumped into the hold of the suction dredger during a loading operation which is carried out in at least two steps, to wit
- a first step in which effluent means are kept at such a high level that the hold is loaded essentially up to its maximum volume and the suction dredger is loaded substantially up to its maximum permissible carrying capacity by pumping a suspension of sand and water into the hold and
- a subsequent second step in which additional suspension is pumped into the hold and in which the effluent means are lowered in dependence upon the weight of the load in the hold to an extent such that the suction dredger remains loaded substantially up to its maximum permissible carrying capacity.
- Such a method is known from Dutch patent specification 138,182. Since the quantity of sand in the hold constantly increases, the effluent means are constantly lowered in order to keep the suction dredger at its maximum permissible carrying capacity. Slow adjustment of the effluent means is performed only with difficulty, since they are likely to be retained. The invention provides a more reliable method in which the hold can yet be loaded rapidly. According to the invention the effluent means are intermittently moved to lower and lower levels.
- Intermittent lowering of the effluent means can be easily performed in a reliable manner. Although in the method according to the invention the suction dredger is transiently loaded slightly below its maximum permissible carrying capacity, it appears that the suction dredger is loaded largely as rapidly as in the case in which it is endeavoured to hold the suction dredger constantly exactly at its maximum permissible carrying capacity. This may be attributable to the fact that in accordance with the invention there are loading periods in which the flow of effluent is comparatively slight, so that the sand of the suspension contained in the hold has more time to settle down or to the fact that owing to the higher reliability of this method the margin between the standard applied during loading to the maximum permissible carrying capacity and the degree of loading at which the ship may founder can be lower.
- The invention relates to and provides, in addition, a suction dredger for carrying out the method in accordance with the invention, said dredger comprising a hold, a pump for pumping a suspension of sand and water into the hold and effluent means to be set in a first loading step at a high level corresponding to the maximum volume of the hold and in a second loading step at a tower level, the proportions of the hold volume being such that in a first step the suction dredger can be loaded with the sand and water mixture substantially up to its maximum permissible carrying capacity, there being provided control-means for bringing the effluent means to lower and lower levels in dependence upon loading measuring means during the second loading step, said dredger being characterized in that said control-means are adapted to lower the effluent means intermittently in steps.
- The invention will be described more fully hereinafter by way of example with reference to the accompanying drawing.
- In the drawing:
- Figure 1 is a schematic longitudinal sectional view of a preferred embodiment of a suction dredger in accordance with the invention in carrying out the method according to the invention, and
- Figures 2 and 3 are each a graph representing the volume of the hold and the weight of the load respectively, when the method according to the invention is carried into effect.
- The
suction dredger 1 shown in Figure 1 is a trawl dredger especially equipped for carrying out the method in accordance with the invention. - The
suction dredger 1 comprises a hold 3 in a hull 2, a pump 4 for pumping a suspension of sand and water into the hold 3 and effluent means 9. The pump 4 communicates at one end with a suction pipe 5, atrailing suction head 10 of which is dragged on along the ground 11 below the water 12, when thesuction dredger 1 is propelled in the direction of the arrow 14 by means of apropeller 13. At the other end the pump 4 communicates with a loading pipe 6, from which the water and sand suspension gets into the hold 3. - The effluent means 9 comprise a vertical,
fixed tube 15 communicating with the water 12, a tube 8 vertically displaceable in the former and having at the top end an overflow dish 7 and ahydraulic cylinder 16, thepiston rod 17 of which is connected with the dish 7 for the vertical adjustment of theoverflow rim 18 of the overflow dish 7. - The hold 3 has very large proportions as compared with the carrying capacity of the
suction dredger 1, that is to say, the hold 3 can be filled with sand only up to the level Z,,,. - In the method according to the invention the loading operation is performed in at least two
steps 21 and 22 (see Figures 2 and 3). In thefirst step 21 theoverflow rim 18 is held in itshighest position 18"' indicated in Figure 1 by broken lines, at least at such a high level that the hold 3 is loaded essentially up to its maximum volume 19 and up to themaximum carrying capacity 20 of thesuction dredger 1 with a suspension of sand and water pumped into the hold 3. In Figures 2 and 3 the graphs drawn in broken lines represent the volume Vt and the weight W, respectively of the total quantities of sand and water contained in the hold 3, whereas the solid lines Vs and Ws represent the volume and the weight respectively of sand settled down in the hold 3. On the abscissa is plotted in Figures 2 and 3 the time. From Figures 2 and 3 it will be apparent that during thefirst step 21 there is first a period in which the hold 3 is filled with a suspension of sand and water, after which, when the hold 3 is already filled, further suspension of sand and water is pumped into the hold 3 whilst the effluent means 9 are still kept at the highest level so that the total volume V, remains at its maximum. Subsequently the next,second step 22 is carried out, in which additional suspension is pumped into the hold 3 and in which the effluent means are lowered in dependence upon the weight of the load in the hold 3 to an extent such that thesuction dredger 1 remains essentially loaded up to its maximumpermissible carrying capacity 20. From Figure 3 it will be seen that in the course of time t during thesecond loading step 22 the graph Wt indicated by broken lines extends substantially horizontally along the dotted line 23. This dotted, straight line 23 and the naturally varying dotted line 24 of Figure 2 would be attained, if theoverflow rim 18 were gradually lowered. According to the invention, however, theoverflow rim 18 is lowered intermittently rather than gradually. For this purpose the effluent means 9 comprise a control-rod 26 with ahead 27, which moves alongpulse generators 28 during the upward and downward movements of theoverflow rim 18. Thepulse generators 28 correspond each to, a level of theoverflow rim 18, where it is retained for some time. - From Figure 1 it will be apparent that the level difference of the
upper pulse generators 28 may be larger than that of the subsequently lower pulse generator 2P - In order to maintain the
suction dredger 1 essentially loaded up to its maximumpermissible carrying capacity 20, it is equipped with adraught gauge 29, from which a signal is applied to acomparator 30, in which a value of the maximum permissible carrying capacity is set. When themaximum carrying capacity 20 of thesuction dredger 1 is attained, thecomparator 30 applies a pulse to a control-means 31 of a hydraulic valve 32, which governs the fluid flow to and from both ends of thehydraulic cylinder 16. The overflow dish 7 then moves down by one level difference until thehead 27 of therod 26 reaches apulse generator 28, which applies a pulse to a control-member 33 for setting the control-valve 32 in a stop position in order to prevent the overflow dish 7 from moving further downwards. During this downward movement of the overflow dish 7 the supernatant layer of water is at once removed from the hold 3, since it flows across theoverflow rim 18 and through thetubes 8 and 15 into the outboard water 12. Then additional suspension is constantly pumped into the hold 3 and after some time the permissible carrying capacity of thesuction dredge 1 is again attained or in other words, the broken lines meet the dotted lines of Figures 2 and 3. At this instant thecomparator 30 again applies a signal to the control-member 31 and thehydraulic cylinder 16 is reactuated for lowering the overflow dish 7 by a further step. .Thus loading is continued in the second loading step until the hold 3 is substantially filled with sand up to the maximum permissible carrying capacity. During thesecond loading step 22 the sand level rises from the level Z, via the level ZII to the level ZIII, to which correspond thepositions
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7707770 | 1977-07-12 | ||
NL7707770.A NL165527B (en) | 1977-07-12 | 1977-07-12 | SUCTION DREDGING VESSEL AND METHOD FOR LOADING A SUCTION DREDGING VESSEL. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0000417A1 EP0000417A1 (en) | 1979-01-24 |
EP0000417B1 true EP0000417B1 (en) | 1981-01-07 |
Family
ID=19828862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78200091A Expired EP0000417B1 (en) | 1977-07-12 | 1978-07-10 | Suction dredger and method of loading the same |
Country Status (8)
Country | Link |
---|---|
US (1) | US4245932A (en) |
EP (1) | EP0000417B1 (en) |
JP (1) | JPS5438088A (en) |
AU (1) | AU528582B2 (en) |
BR (1) | BR7804494A (en) |
DE (1) | DE2860408D1 (en) |
EG (1) | EG15425A (en) |
NL (1) | NL165527B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI66669C (en) * | 1983-02-28 | 1984-11-12 | Waertsilae Oy Ab | OEVERSTROEMNINGSROER FOER LASTRUMSFOERSETT SUGMUDDERVERK |
BE1005478A3 (en) * | 1991-10-30 | 1993-08-03 | Dredging Int | Procedure and equipment for selective removal of contaminated anduncontaminated dredged material |
BE1018577A4 (en) * | 2009-04-22 | 2011-04-05 | Dredging Int | Dredging vehicle and method for loading the dredging vehicle with dredging spoil. |
NL2013368B1 (en) * | 2014-08-26 | 2016-09-26 | Ihc Holland Ie Bv | Adjustable overflow system. |
NL2015858B1 (en) * | 2015-11-26 | 2017-06-13 | Ihc Holland Ie Bv | Panflute overflow system. |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE154328C (en) * | 1900-01-01 | |||
US1706035A (en) * | 1926-11-24 | 1929-03-19 | Nacey James | Vessel |
DE484808C (en) * | 1929-10-22 | Werft Nobiskrug G M B H | Float for cargo of wet gravel or sand | |
NL6815921A (en) * | 1968-11-08 | 1970-05-12 | ||
NL7513264A (en) * | 1975-11-12 | 1977-05-16 | Spanstaal | SUCTION DREDGING VESSEL AND METHOD FOR LOADING A WIDE OF A SUCTION DREDGE VESSEL. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL6816373A (en) * | 1968-11-15 | 1970-05-20 | ||
NL6816677A (en) * | 1968-11-21 | 1970-05-25 | ||
NL6902178A (en) * | 1969-02-12 | 1970-08-14 | ||
NL145011B (en) * | 1970-05-14 | 1975-02-17 | Ballast Nedam Groep Nv | METHOD FOR LOADING A DREDGING VESSEL WITH DREDGERS. |
JPS5114799A (en) * | 1974-07-25 | 1976-02-05 | Shinchuo Kogyo Kk | KOSENJUYO HYOTEKISOCHI |
-
1977
- 1977-07-12 NL NL7707770.A patent/NL165527B/en not_active Application Discontinuation
-
1978
- 1978-07-10 EP EP78200091A patent/EP0000417B1/en not_active Expired
- 1978-07-10 DE DE7878200091T patent/DE2860408D1/en not_active Expired
- 1978-07-11 US US05/923,566 patent/US4245932A/en not_active Expired - Lifetime
- 1978-07-12 BR BR7804494A patent/BR7804494A/en unknown
- 1978-07-12 AU AU37965/78A patent/AU528582B2/en not_active Expired
- 1978-07-12 EG EG78436A patent/EG15425A/en active
- 1978-07-12 JP JP8564178A patent/JPS5438088A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE154328C (en) * | 1900-01-01 | |||
DE484808C (en) * | 1929-10-22 | Werft Nobiskrug G M B H | Float for cargo of wet gravel or sand | |
US1706035A (en) * | 1926-11-24 | 1929-03-19 | Nacey James | Vessel |
NL6815921A (en) * | 1968-11-08 | 1970-05-12 | ||
NL7513264A (en) * | 1975-11-12 | 1977-05-16 | Spanstaal | SUCTION DREDGING VESSEL AND METHOD FOR LOADING A WIDE OF A SUCTION DREDGE VESSEL. |
Non-Patent Citations (3)
Title |
---|
HANSA SCHIFFAHRT - SCHIFFBAU - HAFEN, 1961, No. 23 PGES 2462 AND 2463 * |
NAVIREES, PORTS ET CHANTIERS, MARS 1951, M. RICHARD "LES NOUVELLES DRAGUES ASPIRATRICES, PIERRE-DUREPAIRE ET PIERRE-HENRY-WATIER" * |
PORTS AND DREDGING, No. 48 1965, "YOLANDA KLEINER LAADRUIM EN GROTERE CAPACITEIT", PAGES 7 TO 9 * |
Also Published As
Publication number | Publication date |
---|---|
EP0000417A1 (en) | 1979-01-24 |
AU528582B2 (en) | 1983-05-05 |
EG15425A (en) | 1986-06-30 |
DE2860408D1 (en) | 1981-02-26 |
JPS5438088A (en) | 1979-03-22 |
NL7707770A (en) | 1979-01-16 |
AU3796578A (en) | 1980-01-17 |
NL165527B (en) | 1980-11-17 |
US4245932A (en) | 1981-01-20 |
JPS6153277B2 (en) | 1986-11-17 |
BR7804494A (en) | 1979-04-03 |
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