EP2871291B1 - Extension piece for a cutting arm of a cutter-suction dredger and method for loosening the bed of a body of water - Google Patents

Extension piece for a cutting arm of a cutter-suction dredger and method for loosening the bed of a body of water Download PDF

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Publication number
EP2871291B1
EP2871291B1 EP14003699.7A EP14003699A EP2871291B1 EP 2871291 B1 EP2871291 B1 EP 2871291B1 EP 14003699 A EP14003699 A EP 14003699A EP 2871291 B1 EP2871291 B1 EP 2871291B1
Authority
EP
European Patent Office
Prior art keywords
extension piece
cutting arm
cutting
cutter
suction dredger
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.)
Active
Application number
EP14003699.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2871291A2 (en
EP2871291A3 (en
Inventor
Walter Dietens
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.)
Jan De Nul Nv
Original Assignee
Jan De Nul Nv
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 Jan De Nul Nv filed Critical Jan De Nul Nv
Priority to PL14003699T priority Critical patent/PL2871291T3/pl
Publication of EP2871291A2 publication Critical patent/EP2871291A2/en
Publication of EP2871291A3 publication Critical patent/EP2871291A3/en
Application granted granted Critical
Publication of EP2871291B1 publication Critical patent/EP2871291B1/en
Priority to HRP20181131TT priority patent/HRP20181131T1/hr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/968—Storing, handling or otherwise manipulating tools when detached from the machine
    • 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
    • E02F3/8841—Floating installations wherein at least a part of the soil-shifting equipment is mounted on a ladder or boom
    • 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
    • E02F3/905—Manipulating or supporting suction pipes or ladders; Mechanical supports or floaters therefor; pipe joints for suction pipes
    • 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
    • E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
    • E02F3/9225—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel with rotating cutting elements
    • E02F3/9231—Suction wheels with axis of rotation parallel to longitudinal axis of the suction pipe

Definitions

  • Extension piece for a cutting arm of a cutter-suction dredger, cutter-suction dredger and method for loosening the bed of a body of water is a first extension piece for a cutting arm of a cutter-suction dredger, cutter-suction dredger and method for loosening the bed of a body of water.
  • the present invention relates to an extension piece for a cutting arm of a cutter-suction dredger, a cutter-suction dredger and a method for loosening the bed of a body of water.
  • a cutter-suction dredger is a vessel that is used for deepening waterways, ports, etc, by loosening a hard, for example rocky, bed by means of a powerful cutting head and then sucking up the loosened residues. They can include relatively large pieces of stone and other hard materials.
  • a cutter-suction dredger is provided with a cutting arm on its underside, also known as a ladder, at the end of which the cutting head is provided.
  • a driveshaft for the cutting head runs along or through this cutting arm and a suction pipe for the material to be removed from the water bed, in which suction pipe a pump is affixed.
  • a cutting arm is constructed as a heavy steel construction.
  • a cutter-suction dredger is designed to work within a certain interval of water depth due to the cutting arm having a certain length. There are limited possibilities for adjustment because a cutter-suction dredger is generally provided with two possible anchor points at different heights for the cutting arm. When the lowest of these two anchor points is used, the maximum depth at which a cutter-suction dredger can operate is obtained.
  • the angle at which the cutting arm is held below the cutter-suction dredger can only be of limited use for adjusting the operating depth because there is an optimum value of this angle for the good operation of the cutting head, whereby only relatively small departures from this optimum value are allowed.
  • an existing cutter-suction dredger is not suitable for supporting a longer and thus heavier cutting arm, and due to a changed weight and a changed weight distribution the seaworthiness of such a cutter-suction dredger is jeopardised.
  • a complicating factor is the fact that a cutter-suction dredger is provided with a work platform at the back to enable the replacement of the cutting head or sections thereof or other maintenance at the end of the cutting arm. With a longer cutting arm on an existing ship the existing embodiments of this work platform would have to protrude further backwards, which is also undesirable for reasons of ship stability and weight distribution.
  • cutter-suction dredgers with a telescopic cutting arm known, as described in NL 7015790 , are known.
  • the purpose of the present invention is to provide a solution to the aforementioned and other disadvantages by providing an extension piece according to claim 1. This has the advantage that an existing cutter-suction dredger can be made suitable for removing material from the bed at a greater depth with relatively low costs and difficulty, in a limited amount of time and with only limited consequences for the sailing properties.
  • the driveshaft comprises at least three parts in the extension piece, i.e. a first part that is arranged to be screwed onto the driveshaft of the cutting arm, a second part that is mounted on bearings at the first end of the extension piece, and a third part to detachably connect the two other parts, whereby preferably the third part can be connected to the first part and the second part by the first and second part both being provided with a flange at an end and the third part being provided with a complementary flange at both ends.
  • Such a construction of the driveshaft of the extension piece enables the existing coupling facility for coupling a cutting head to the driveshaft of the unextended cutting arm to be used for the coupling to the driveshaft of the extension piece, whereby, thanks to the third part, the connection to the first part of the driveshaft can be completed, so that the cutting head can be driven.
  • the invention also concerns a cutter-suction dredger with a raisable and lowerable cutting arm for cutting material loose from the bed of a body of water, whereby the lowerable cutting arm is provided with an extension piece as described above.
  • the extension piece is preferably constructed as a steel structure that is provided with a flange for coupling to the cutting arm and the cutting arm is also provided with such a flange.
  • the cutter-suction dredger is provided with two suspension points at different heights for the cutting arm and a work platform at its back to gain access to the free end of the cutting arm in the raised position without an extension piece, whereby the work platform can be moved between two working positions at different heights, whereby the lowest working position is suitable for gaining the said access when the cutting arm is suspended from the lowest suspension point and the highest working position is suitable for gaining the said access when the cutting arm is suspended from the highest suspension point, whereby the work platform is provided with an auxiliary platform that is lower than the work platform and which protrudes backwards from the work platform, and that, with the work platform in the highest working position, has such a position that access is gained to the first end of the extension piece from the auxiliary platform when the cutting arm is suspended from the lowest suspension point.
  • the known work platform has at least two secured positions or working positions, respectively a highest and lowest one, corresponding to the position of the cutting head when an unextended cutting arm is suspended from the highest or lowest suspension point respectively.
  • the invention further concerns a method for loosening a bed of a body of water up to a specific depth below the water surface, characterised in that a cutter-suction dredger with a raisable and lowerable cutting arm is used that is designed to operate up to a depth that is less than the specific depth, whereby the cutting arm is provided with an extension piece as described above, and whereby the bed is loosened by means of a cutting head on the first end of the extension piece.
  • the cutter-suction dredger 1, or cutter-suction dredge, shown in figures 1 to 3 is a ship that is provided with a spud 2 near its front, a cutting arm 3, or ladder, on its underside and a work platform 4 on its back.
  • the cutting arm 3 can be raised and lowered again by means of a lifting device 5.
  • the spud 2 is anchored in the seabed 7 to be able to apply sufficient force to the cutting arm to be able to effectively loosen material from the seabed 7.
  • the cutter-suction dredger 1 is provided with two possible suspension points for the cutting arm 3, i.e. a top suspension point 8 and a bottom suspension point 9. In the drawings the cutting arm 3 is suspended from the bottom suspension point 9.
  • the cutting arm 9 is provided with an extension piece 10.
  • a cutting head 12 is affixed at a first end 11, more specifically the free end, of the extension piece 10.
  • a suction pipe 13 runs from the cutting head 12 for the transport of loosened bed material to the hull of the cutter-suction dredger.
  • a cutting arm 3 with an extension piece 10 is of course still a cutting arm, for completeness in this description the term cutting arm is used for the original unextended cutting arm 3, and the combination of cutting arm 3 and extension piece 10 is denoted an extended cutting arm.
  • the extension piece 10 essentially consists of a steel casing 14 in two parts that are connected by partitions 15 that are provided with a cutaway that is oriented towards the top of the extension piece 10.
  • the length L of the casing is approximately 10 metres.
  • the extension piece 10 is provided with an internal flange 17 at its second end 16.
  • the cutting arm 3 is provided with an external flange 19 close to its free end 18. These two flanges 17, 19 are coupled together to thereby structurally couple the extension piece 10 and the cutting arm 3 together.
  • a multipart driveshaft 20 for the drive of the cutting head 12 is provided through the cutting arm 3 and the extension piece 10.
  • this driveshaft 20 is formed by the original driveshaft. This is mounted on bearings at the free end 18 of the cutting arm 3 and is provided with a coupling 21 for fasting a cutting head 12 thereto.
  • the driveshaft 20 is formed from three parts, i.e. a first part 22 at the second end 16, a second part 23 at the first end 11, and a third part 24.
  • the first part 22 is constructed as a coupling 25, as is usually present at a cutting head 12, and is affixed, more specifically screwed, to the complementary coupling 21 of the driveshaft of the cutting arm. At its other end the first part 22 is provided with a flange.
  • the second part 23 is mounted on bearings close to the first end 11 of the extension piece 10, and protrudes partially outside the casing 14, where it is provided with a coupling 21 for a cutting head 12, and in the drawings shown also with this cutting head 12. At its other end the second part 23 is provided with a flange.
  • the third part 24 is a cylindrical shaft part that is provided with a flange at both ends.
  • the third part 24 is affixed between the first part 22 and the second part 23, whereby the flanges of the said parts 22, 23, 24 are coupled together.
  • An inlet piece 26 for a suction pipe 13 is fastened to the extension piece 10, as well as a partial suction pipe 13 that is coupled to the suction pipe 13 of the cutting arm 3.
  • FIGS 4 and 5 show an unmounted extension piece 10. This extension piece 10 is already provided with a cutting head 12.
  • the work platform 4 at the back of the cutter-suction dredger is shown in more detail in figures 6 and 7. It essentially consists of a supporting construction 27 fastened to the cutter-suction dredger on which guide rails 28 are mounted.
  • the U-shaped work platform 4 is mounted on these guide rails 28. Thanks to the guide rails 28 the work platform 4 can be moved upwards and downwards, whereby it has two working positions in which it can be fastened so that it can be entered safely.
  • the first, highest, working position is shown in figure 6 .
  • This working position is at such a height and such a distance from the suspension points 8,9 of the cutting arm that the cutting head 12, if mounted, on a raised unextended cutting arm 23 that is suspended from the top suspension point 8, is accessible from the work platform 4 at this working position.
  • the second, lowest, working position that is not shown in figure 6 is at such a height and such a distance from the suspension points 8, 9 of the cutting arm 3 that the cutting head 12, if mounted, on a raised unextended cutting arm 3 that is suspended from the bottom suspension point 9, is accessible from this working position.
  • the work platform 4 is set at its highest working position.
  • the work platform 4 is provided with a U-shaped auxiliary platform 29 that is fastened to the work platform 4 but which is lower and further to the back, so that the cutting head 12 on the extension piece 10 is accessible from the auxiliary platform 29 for maintenance, in particular for the replacement of the cutting teeth of the cutting head 12.
  • a cutter-suction dredger 1 without extension piece, that is intended to be able to operate up to a certain water depth, is modified to this end.
  • the cutting arm 3 of the cutter-suction dredger 1 is fastened to the lowest suspension point 9 provided to this end. Then the cutting head 12 is detached from the cutting arm and temporarily set to one side.
  • the cutting arm 3 is now provided with a flange 19.
  • An extension piece 10 manufactured beforehand is mounted by its flange 17 on the flange 19 of the cutting arm 3.
  • first part 22 of the driveshaft 20 of the extension piece 10 is mounted on the cutting arm 3, more specifically on the coupling 21 for the cutting head 12.
  • the second part 23 of this driveshaft 20 is hereby already present in the first end 11 of the extension piece 10.
  • the third part 24 of the driveshaft 20 of the extension piece 10 is slid between the first part 22 and the second part 23 of this driveshaft 20 and fastened to the first part 22 and second part 23 by means of the flanges present on the parts.
  • the cutting head 12 is again affixed to the second part 23 of the driveshaft 20.
  • the cutting head 12 can of course be affixed to the extension piece 10 earlier.
  • the cutter-suction dredger 1 is now suitable for operation seven metres deeper below the water surface than previously.
  • the spud 2 is lowered and secured in the seabed 7.
  • the cutting arm 3 is also lowered.
  • the cutting arm 3 can now loosen material from the seabed 7, whereby this material is immediately sucked up by the suction pipe 13 to the hull of the cutter-suction dredger 1.
  • the necessary counter pressure for the cutting head 12 is hereby provided by the spud 2.
  • the cutter-suction dredger 1 When removing bed material the cutter-suction dredger 1 makes a turning movement around the spud 2, so that a circular track of material is removed from the seabed 7. Then thanks to a movable carriage in the cutter-suction dredger 1, to which the spud is fastened, the cutter-suction dredger 1 moves a small distance backwards with respect to the spud 2, after which a new circular track of material is removed from the seabed 7.
  • the work platform 4 When the cutting elements on the cutting head 12 have to be replaced or when for another reason access is required to the cutting head 12, it is raised, the work platform 4 is placed in its highest working position and the desired access can be obtained via the auxiliary platform 29.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Control Of Cutting Processes (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP14003699.7A 2013-11-05 2014-11-03 Extension piece for a cutting arm of a cutter-suction dredger and method for loosening the bed of a body of water Active EP2871291B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL14003699T PL2871291T3 (pl) 2013-11-05 2014-11-03 Przedłużenie ramienia frezującego pogłębiarki ssącej z głowicą frezującą i sposób rozluźniania dna zbiornika wodnego
HRP20181131TT HRP20181131T1 (hr) 2013-11-05 2018-07-19 Dio za produljivanje sječivnog kraka jaružala sa sječenjem i usisavanjem i postupak labavljenja dna vodene površine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE2013/0750A BE1021787B1 (nl) 2013-11-05 2013-11-05 Verlengstuk voor een snijarm van een cutterzuiger, cutterzuiger en werkwijze om een bodem van een watermassa los te maken

Publications (3)

Publication Number Publication Date
EP2871291A2 EP2871291A2 (en) 2015-05-13
EP2871291A3 EP2871291A3 (en) 2015-05-20
EP2871291B1 true EP2871291B1 (en) 2018-06-27

Family

ID=49916751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14003699.7A Active EP2871291B1 (en) 2013-11-05 2014-11-03 Extension piece for a cutting arm of a cutter-suction dredger and method for loosening the bed of a body of water

Country Status (8)

Country Link
EP (1) EP2871291B1 (nl)
BE (1) BE1021787B1 (nl)
CY (1) CY1120965T1 (nl)
DK (1) DK2871291T3 (nl)
ES (1) ES2687261T3 (nl)
HR (1) HRP20181131T1 (nl)
PL (1) PL2871291T3 (nl)
PT (1) PT2871291T (nl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113175016A (zh) * 2021-04-26 2021-07-27 江苏省水利机械制造有限公司 一种复合型水下动力清淤拖耙

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2242520A (en) * 1937-09-09 1941-05-20 Grundborg Olaf Hydraulic mining apparatus
NL129899C (nl) * 1968-03-12
DE2051941A1 (de) * 1969-11-05 1971-05-13 Dan Ionescu Sisesti, Bukarest Schwimmsaugbagger mit beweglichem Saugrohr
NL156204B (nl) * 1973-08-01 1978-03-15 Bos Kalis Westminster Inrichting voor het baggeren op variabele diepte.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
PT2871291T (pt) 2018-10-16
BE1021787B1 (nl) 2016-01-18
EP2871291A2 (en) 2015-05-13
CY1120965T1 (el) 2019-12-11
ES2687261T3 (es) 2018-10-24
EP2871291A3 (en) 2015-05-20
DK2871291T3 (en) 2018-09-24
HRP20181131T1 (hr) 2018-10-05
PL2871291T3 (pl) 2019-07-31

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