WO2003102313A1 - Appareil pour supprimer les sediments et unite fonctionnelle a utiliser dans ce dernier - Google Patents

Appareil pour supprimer les sediments et unite fonctionnelle a utiliser dans ce dernier Download PDF

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Publication number
WO2003102313A1
WO2003102313A1 PCT/NL2003/000359 NL0300359W WO03102313A1 WO 2003102313 A1 WO2003102313 A1 WO 2003102313A1 NL 0300359 W NL0300359 W NL 0300359W WO 03102313 A1 WO03102313 A1 WO 03102313A1
Authority
WO
WIPO (PCT)
Prior art keywords
functional unit
channel
propellers
propeller
water flow
Prior art date
Application number
PCT/NL2003/000359
Other languages
English (en)
Inventor
Michiel Arthur Westermann
Frank Hoos
Original Assignee
Seatools B.V.
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 Seatools B.V. filed Critical Seatools B.V.
Priority to MXPA04012244A priority Critical patent/MXPA04012244A/es
Priority to EP03730909A priority patent/EP1513987A1/fr
Priority to AU2003241212A priority patent/AU2003241212A1/en
Publication of WO2003102313A1 publication Critical patent/WO2003102313A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
    • 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
    • E02F3/9206—Digging devices using blowing effect only, like jets or propellers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/003—Dredgers or soil-shifting machines for special purposes for uncovering conduits

Definitions

  • the invention in the first place, relates to an apparatus for removing sediment, such as sand, clay and the like, from installations present below the water surface, such as pipelines or the like, comprising a functional unit which can be connected to a hoisting unit by means of hoisting and control cables, which functional unit is provided with a channel in which a driveable propeller is disposed for creating a water flow through the channel from an inlet side to an outlet side thereof.
  • Offshore installations present in or on the seabed, such as gas and oil pipes, are covered by sediment (such as sand, clay or the like) with the passage of time.
  • the apparatus according to the invention is characterized in that two independently driven propellers are disposed substantially coaxi- ally behind each other in said channel, the first of said propellers being designed to create a low-discharge, high- velocity water flow through the channel, and the second propeller being designed to create a high-discharge, low- velocity water flow through the channel .
  • the characterising aspects of the present invention are based on the recognition that the properties of the sediment play an important role in the removal thereof.
  • the most effective way of removing sediment not exhibiting any cohe- sion (sand, for example) is to use a high-discharge, low- velocity water flow. Sediment exhibiting a high degree of cohesion (clay, for example) , on the other hand, can be removed most effectively by means of a low-discharge, relatively high-velocity water flow.
  • the actual propeller design may be based on the constructional aspects that are known per se from the field of hydrodynamics.
  • An example of such an aspect is the fact that a propeller for cre- ating a low-discharge, high-velocity water flow has a small diameter, whereas a propeller for creating a high-discharge, low-velocity water flow has a large diameter. It is also conceivable, however, to use special channel contours in order to obtain the aforesaid characteristics.
  • Such aspects are known from the field of hydrodynamics, and consequently they need not be explained in more detail herein.
  • the first propeller is positioned nearest the outlet side of the channel .
  • the first and the second propeller preferably rotate in opposite directions.
  • the external moments generated by the rotating propellers are of opposite sign, so that said moments can offset each other in whole or in large measure.
  • the extent to which additional measures are required in order to stabilise the functional unit can be minimised. If the two propellers would rotate in the same direction, the external moment being generated would cause the functional unit to turn, which might constitute a risk as regards the control thereof by means of the hoisting cables and the control cables.
  • the functional unit is provided with at least two channels lying side by side, each channel housing a first and a second propeller.
  • Such channels lying side by side create different water flows, which makes it possible to further enhance the operating range and the effectiveness of the functional unit.
  • the angle between the two channels will furthermore be quite convenient for the angle between the two channels to be adjustable. If, for example, the channels do not extend at an angle with respect to each other (the generated water flows extend substantially parallel to each other in that case) , removal of the sediment can take place over a relatively great depth but small width. Adjusting an angle of the channels relative to each other (the water flows no longer extend parallel to each other in that case, but at an angle with respect to each other) makes it possible to reduce the depth over which the sediment is being removed and at the same time increase the width of the area being covered.
  • Such adjustability of the two channels with respect to each other can be realised e.g. by using a functional unit consisting of two functional unit halves which are pin-pivoted together, each unit half being provided with one of the aforesaid channels.
  • the two functional unit halves may e.g. also be interconnected by means of a driving unit, such as a cylin- der-piston assembly, at a position some distance away from said pivot pin. Operation of the cylinder-piston assembly will cause the unit halves to pivot about the aforesaid pivot pin relative to each other, so that a desired angle between the channels can be adjusted.
  • a driving unit such as a cylin- der-piston assembly
  • the propellers are preferably driven by hydraulic motors, al- though it should be understood that also other types of driving units are possible within the framework of the present invention. It would also be possible, therefore, to use electric motors, for example.
  • the hoisting unit comprises a telescoping arm, whose free end carries an auxiliary arm, which is pivotable about a substantially vertical pivot, over which auxiliary arm the hoisting cables for the functional unit are carried.
  • a pivotable auxiliary arm makes it possible to change the position of the functional unit in such a manner that pivoting about the top pivot thereof takes place. This may be convenient, for example if the hoisting unit is present on board a vessel and the vessel takes up a position in which the swell is minimised.
  • the functional unit can be pivoted about the aforesaid top pivot independently of the position of the vessel, such that the unit will take up the operationally most advantageous position with respect to the sediment to be removed.
  • the invention relates to a functional unit for use in an apparatus for removing sediment according to the invention.
  • Fig. 1 is a highly schematic view of an apparatus according to the invention, which is installed on board a vessel ;
  • Fig. 2 is a perspective view of an embodiment of a functional unit as used in an apparatus according to Fig. 1;
  • Fig. 3 is a longitudinal sectional view of the functional unit that is shown in Fig. 2;
  • Fig. 4 it is a perspective view of an embodiment of a hoisting unit as used in the apparatus according to Fig. 1.
  • Fig. 1 shows a vessel 1, on board of which a hoisting unit 2 is present.
  • the hoisting unit inter alia comprises a telescoping arm 3, whose free end carries an auxiliary arm 5, which is pivo- table about a substantially vertical pivot 4.
  • the hoisting cables for a functional unit 7, among other elements, pass over said auxiliary arm 5.
  • Fig. 1 does not show control cables for the functional unit 7.
  • the functional unit 2 which is suspended from the hoisting unit 2 by means of the hoisting cables 6, comprises two functional unit halves 8 and 9, which are pivoted together at their upper sides by means of a pivot pin 10.
  • Each functional unit half 8, 9 is provided with a channel 11, in each of which two independ- ently driven propellers 12, 13, respectively, are disposed substantially coaxially behind each other.
  • the sediment 14 can be removed from an installation disposed below the water surface, such as a pipeline 15, by means of the functional unit 7, in a manner to be described hereinafter.
  • FIG. 2 shows the functional unit 7 in perspective view.
  • the Figure shows the two functional unit halves 8 and 9, which are pivoted to- gether by means of a pivot pin 10.
  • a cylinder-piston assembly 16 is fixed to the functional unit halves 8 and 9 with both ends, and telescoping movement of the cylinder-piston assembly 16 will result in an adjustment of the angle between the two functional unit halves 8 and 9 (with the two unit halves pivoting relative to each other about the pivot pin 10) .
  • Fig. 2 furthermore shows the hoisting cables 6, by means of which the functional unit 7 is suspended from the hoisting unit 2.
  • Each functional unit half furthermore com- prises ballast means 17, tensioning means 18 for fixing the functional unit 7 to the deck of the vessel 1 in an inoperative position thereof, whilst furthermore an arm 20 is shown, on which monitoring means (such as a camera) for monitoring the process to be carried out can be mounted.
  • Fig. 2 shows the upper side (the inlet side) of the channels 11.
  • the propellers 12 are shown to be present in said channels.
  • each channel 11 Present in each channel 11 is an upper propeller 12 and a lower propeller 13.
  • the propeller 12 is disposed nearest the inlet side of the channel 11, whilst the propeller 13 is disposed nearest the outlet side of the channel 11.
  • Each propeller 12 is driven by a driving source 21, and each propeller 13 is driven by a driving source 22.
  • Said driving sources may be hydraulic motors, for example .
  • Each assembly 12, 21 and 13, 22, respectively, consisting of a propeller and an associated driving source is suspended inside the channel 11 via suspension means 23 and 24, respectively.
  • each upper propeller 12 is larger than the diameter of each lower propeller 13. Furthermore, each lower propeller 13 is disposed in a narrowed auxiliary channel 25.
  • Each upper propeller 12 creates a high-discharge, low-velocity water flow from the inlet side to the outlet side of the channel 11.
  • Each propeller 13, on the other hand, creates a low- discharge, high-velocity water flow.
  • the desired water flow for removing sediment from an installation 15 can be created at the outlet side of each channel 11 by selectively activating the driving sources 21 and 22. The selection of the type of water flow is made in dependence on the nature of the sediment to be removed.
  • the propellers 12 of the functional unit halves 8 and 9 are of opposite pitch, and consequently they rotate in opposite directions. As a result, any external moments that may occur will offset each other. This also applies with regard to the propellers 13.
  • Fig. 4 shows a hoisting unit 2 in perspective view.
  • the hoisting unit 2 has a telescoping arm 3, which can be operated by a cylinder- piston assembly 26, for example.
  • a telescoping arm 3 which can be operated by a cylinder- piston assembly 26, for example.
  • auxiliary arm 5 which is pivotable with respect to the arm 3 about a substantially vertical pivot 3 (see Fig. 1) .
  • Guide means 27 for the hoisting cables 6 are mounted on the auxiliary arm 5.
  • Fig. 4 furthermore shows control cables 28, by means of which various operative parts of the functional unit 7 can be operated in a manner which is not shown.
  • Such control cables may include hydraulic lines, for example .
  • the arm 3 takes up its fully telescoped position and the functional unit 7 is present on board the vessel that supports the hoisting unit 2.
  • the functional unit 7 is fixed to the deck of the vessel, e.g. by means of the tensioning devices 18 (see Fig. 2) in that position.
  • the arm 3 is telescoped out (possibly after being lifted slightly with its free end, for which purpose a pivot 29 may be used, for example) until the functional unit 7 extends beyond the board of the vessel. Subsequently, the hoisting cables 6 and the control cables 28 are paid out, so that the functional unit 7 can be lowered to the desired depth, a desired distance above the sediment 14.
  • the position of the functional unit 7 with respect to an installation present in the sediment 14 can be adjusted by pivoting the auxiliary arm 5 with respect to the arm 3 so as to obtain an optimum operation of the functional unit.
  • the propellers 12 and 13 are operated, as a result of which a water flow is created, by means of which the sediment 14 can be removed.
  • the angle between the functional unit halves 8 and 9 can be adjusted by means of the cylinder-piston assembly 16 for the purpose of controlling the water flow from the two channels 11.
  • the invention is not limited to the embodiment as described above, which can be varied in several ways without departing from the scope of the invention as defined in the claims .

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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)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

L'invention concerne un appareil pour supprimer les sédiments (14), tels que le sable, l'argile et similaire, dans des installations présentes au-dessous de la surface de l'eau, telles que des pipelines (15) ou similaire. Ledit appareil comprend une unité fonctionnelle (7) qui peut être raccordée à une unité de levage (2) au moyen de câbles de levage et de commande, unité comportant un canal (11) dans lequel une hélice commandée est placée pour créer un écoulement d'eau dans ledit canal d'un côté entrée à un côté sortie. Deux hélices commandées séparément (12, 13) sont disposées sensiblement coaxialement l'une derrière l'autre, la première étant conçue pour créer un flux d'eau à grande vitesse et faible décharge dans le canal et la seconde pour créer un flux d'eau faible vitesse, à grande décharge dans ledit canal.
PCT/NL2003/000359 2002-06-04 2003-05-16 Appareil pour supprimer les sediments et unite fonctionnelle a utiliser dans ce dernier WO2003102313A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
MXPA04012244A MXPA04012244A (es) 2002-06-04 2003-05-16 Aparato para remover sedimento y unidad funcional para su uso dentro de este.
EP03730909A EP1513987A1 (fr) 2002-06-04 2003-05-16 Appareil pour supprimer les sediments et unite fonctionnelle a utiliser dans ce dernier
AU2003241212A AU2003241212A1 (en) 2002-06-04 2003-05-16 Apparatus for removing sediment and functional unit for use therein

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1020754 2002-06-04
NL1020754A NL1020754C2 (nl) 2002-06-04 2002-06-04 Inrichting voor het verwijderen van sediment en functie-eenheid voor toepassing daarin.

Publications (1)

Publication Number Publication Date
WO2003102313A1 true WO2003102313A1 (fr) 2003-12-11

Family

ID=29707805

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2003/000359 WO2003102313A1 (fr) 2002-06-04 2003-05-16 Appareil pour supprimer les sediments et unite fonctionnelle a utiliser dans ce dernier

Country Status (5)

Country Link
EP (1) EP1513987A1 (fr)
AU (1) AU2003241212A1 (fr)
MX (1) MXPA04012244A (fr)
NL (1) NL1020754C2 (fr)
WO (1) WO2003102313A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008065360A1 (fr) * 2006-11-29 2008-06-05 Rotech Holdings Limited Appareil d'excavation subaquatique
WO2009133373A2 (fr) * 2008-05-01 2009-11-05 Rotech Holdings Limited Améliorations à un appareil d'excavation sous-marin ou associées audit appareil
CN102425203A (zh) * 2011-08-23 2012-04-25 陈景顺 可控式水动力自动清淤机及其控制系统
CN103321264A (zh) * 2012-03-19 2013-09-25 张玉林 螺旋借力河道破淤扬沙清淤装置
EP2317016B2 (fr) † 2009-10-30 2019-12-18 James Fisher MFE Limited Appareil d'excavation sous-marine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0134312A1 (fr) * 1983-07-13 1985-03-20 Dosbouw v.o.f. Méthode et dispositif pour déblayer des matériaux au dessous de la surface d'eau
US4728256A (en) * 1985-07-26 1988-03-01 Toshinobu Araoka Underwater pump
US5480291A (en) * 1990-02-05 1996-01-02 Underwater Excavation Limited Underwater excavation apparatus
JPH09125450A (ja) * 1995-10-27 1997-05-13 Mitsubishi Heavy Ind Ltd ヘドロ等の吸引装置
US6053663A (en) * 1995-02-07 2000-04-25 Dikken; Jacob Jan Device for creating a local water flow
GB2359103A (en) * 2000-02-12 2001-08-15 Nicholas Victor Sills Balanced thrust underwater excavation apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0134312A1 (fr) * 1983-07-13 1985-03-20 Dosbouw v.o.f. Méthode et dispositif pour déblayer des matériaux au dessous de la surface d'eau
US4728256A (en) * 1985-07-26 1988-03-01 Toshinobu Araoka Underwater pump
US5480291A (en) * 1990-02-05 1996-01-02 Underwater Excavation Limited Underwater excavation apparatus
US6053663A (en) * 1995-02-07 2000-04-25 Dikken; Jacob Jan Device for creating a local water flow
JPH09125450A (ja) * 1995-10-27 1997-05-13 Mitsubishi Heavy Ind Ltd ヘドロ等の吸引装置
GB2359103A (en) * 2000-02-12 2001-08-15 Nicholas Victor Sills Balanced thrust underwater excavation apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 09 30 September 1997 (1997-09-30) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008065360A1 (fr) * 2006-11-29 2008-06-05 Rotech Holdings Limited Appareil d'excavation subaquatique
GB2455958A (en) * 2006-11-29 2009-07-01 Rotech Holdings Ltd Underwater excavation apparatus
GB2455958B (en) * 2006-11-29 2011-07-20 Rotech Holdings Ltd Underwater excavation apparatus
US8893408B2 (en) 2006-11-29 2014-11-25 Rotech Limited Underwater excavation apparatus
WO2009133373A2 (fr) * 2008-05-01 2009-11-05 Rotech Holdings Limited Améliorations à un appareil d'excavation sous-marin ou associées audit appareil
WO2009133373A3 (fr) * 2008-05-01 2010-04-01 Rotech Holdings Limited Améliorations à un appareil d'excavation sous-marin ou associées audit appareil
US8522460B2 (en) 2008-05-01 2013-09-03 Rotech Holdings Limited Underwater excavation apparatus
EP2317016B2 (fr) † 2009-10-30 2019-12-18 James Fisher MFE Limited Appareil d'excavation sous-marine
CN102425203A (zh) * 2011-08-23 2012-04-25 陈景顺 可控式水动力自动清淤机及其控制系统
CN103321264A (zh) * 2012-03-19 2013-09-25 张玉林 螺旋借力河道破淤扬沙清淤装置

Also Published As

Publication number Publication date
NL1020754C2 (nl) 2003-12-08
MXPA04012244A (es) 2005-08-26
EP1513987A1 (fr) 2005-03-16
AU2003241212A1 (en) 2003-12-19

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