EP0860556A1 - Method for making a trench under water and device therefor - Google Patents
Method for making a trench under water and device therefor Download PDFInfo
- Publication number
- EP0860556A1 EP0860556A1 EP98200227A EP98200227A EP0860556A1 EP 0860556 A1 EP0860556 A1 EP 0860556A1 EP 98200227 A EP98200227 A EP 98200227A EP 98200227 A EP98200227 A EP 98200227A EP 0860556 A1 EP0860556 A1 EP 0860556A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- trench
- water
- water jet
- carrier head
- bed material
- 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.)
- Withdrawn
Links
Images
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
- E02F3/9206—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
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
- E02F5/104—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water
- E02F5/107—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water using blowing-effect devices, e.g. jets
-
- 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
- E02F5/287—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways with jet nozzles
Definitions
- the invention relates to a method for making a trench under water, wherein bed material of the trench for excavating is processed by means of water under pressure flowing out of at least one water jet.
- This known method requires a considerable amount of time since water is sprayed onto the bed material in a manner which is difficult to control, wherein an additional transporting operation is necessary to remove eroded bed material, whereby this known method has a low efficiency.
- the invention improves the known method as stated in the characteristic of claim 1.
- the thrust force of the water is used efficiently for displacing bed material out of the trench so that no, or less, transport is required later.
- the invention also provides a device as stated in claim 7.
- the invention further provides preferred embodiments of the device in the claims 8-12.
- the device 1 comprises a vessel 2 in the form of a dredger having at least one pump 3 for supplying water under pressure via a conduit 5 adjustable by suspension means 4 to water jets 7 and auxiliary water jets 8 supported by a carrier head 6.
- Such a device 1 allows a trench 9 to be made of for instance about 1 m deep and 10 m wide per water jet in one movement.
- Conduit 5 comprises a water feed 11 and an auxiliary water feed 12 for supplying water under pressure respectively to water jets 7 and auxiliary water jets 8, which feeds 11, 12 can be controlled individually by means of valves (not shown). It is also possible to provide the auxiliary water jets 8 with water via the auxiliary water feed 12 by means of another pump.
- the direction arrow 13 indicates the direction in which carrier head 6 is further towed by the vessel 2 defining the direction of the displacement path of trench 9.
- Carrier head 6 and conduit 5 are held in a suitable position respectively via support member 16 adjustable with adjusting means 14 and via suspension means 4.
- the adjusting means 17 allow the carrier head 6 to be positioned via a control member 15 and water jets 7 and auxiliary water jets 8 to thus be directed by pivoting of carrier head 6 over its longitudinal axis 18.
- the auxiliary water jets 8 serve to clear away bed material in front of the carrier head 6 in the direction 13 of the path of movement of water jets 7.
- auxiliary water jets 8 extend roughly axially relative to the trench for excavating, whereby bed material is eroded axially of the trench 9 for excavating by water under pressure from auxiliary water jets 8 so that carrier head 6 can be moved by vessel 2 via suspension means 4 in the displacement direction 13 of the trench for excavating.
- Water jets 7 spray water under pressure in a spraying direction (arrow 18) lying transversely of the trench direction along the bed material of the trench 9 for excavating as well as the bed material eroded by auxiliary water jets 8 and displace this material from the trench 9 to the side edges 20.
- the carrier head 6 is preferably hydraulically adjustable so that:
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Abstract
Description
- the angle a of the water jet relative to the horizontal plane can be adapted as a function of the working depth;
- the angle b of the water jet relative to the axis of the trench for excavating can be adapted as a function of the angle between the axis of the ship and the axis of the trench; and
- the
carrier head 6 can make oscillations round a vertical axis in order to have a favourable effect on productivity.
Claims (12)
- Method for making a trench under water, wherein bed material of the trench for excavating is processed by means of water under pressure flowing out of at least one water jet supported by a carrier head, characterized in that the water jet is displaced in an at least partially dug-in position along the path of the trench, that water under pressure is sprayed from the water jet in a spraying direction lying transversely of the trench direction along the bed material of the trench for excavating and that by means of at least one auxiliary water jet water under pressure is sprayed at bed material of the trench for excavating such that the displacement path for the water jet is cleared.
- Method as claimed in claim 1, characterized in that the water jet encloses an angle relative to its direction of displacement of at least 45° but preferably an angle in the order of magnitude of 60°.
- Method as claimed in claim 1 or 2, characterized in that water under pressure is sprayed in two spraying directions lying transversely of the trench direction along bed material of the excavated trench located on either side of the displacement path of the carrier head.
- Method as claimed in claim 1, 2 or 3, characterized in that the displacement path of each water jet is cleared by means of a plurality of auxiliary water jets directed in diverse directions.
- Method as claimed in any of the foregoing claims, characterized in that the water jet or water jets is/are placed in an at least partly dug-in position by directing the auxiliary water jet or auxiliary water jets in a mainly downward direction onto the bed material.
- Method as claimed in any of the foregoing claims, characterized in that the carrier head is supported relative to the bottom of the excavated trench by means of support means adjusting the height of the carrier head.
- Device for performing the method as claimed in any of the foregoing claims, comprising:a vessel,a pump carried by the vessel for supplying water under pressure,a carrier head adjustable in depth relative to the vessel,at least one water jet supported by the carrier head and connected to the pump, characterized in that the water jet can be displaced in an at least partly dug-in position along the path of the trench, while water under pressure is sprayed from the water jet in a spraying direction lying transversely of the trench direction along the bed material of the trench for excavating and that the carrier head bears at least one auxiliary water jet which is connected to a pump supplying water under pressure and which is positioned and directed such that the bed material is thereby sprayed in order to clear the displacement path of the water jet.
- Device as claimed in claim 7, characterized in that each water jet encloses an angle relative to its direction of displacement of at least 45° but preferably an angle in the order of magnitude of 60°.
- Device as claimed in claim 7 or 8, characterized in that the device comprises an auxiliary water feed for feeding water to the auxiliary water jet(s).
- Device as claimed in claim 7, 8 or 9, characterized in that the device comprises a control member for directing the carrier head.
- Device as claimed in any of the claims 7-10, characterized in that the device comprises support elements for adjusting the height of the carrier head relative to the bed of the trench for excavating.
- Device as claimed in any of the claims 7-11, characterized in that the parameters of the water flowing out of the carrier head in pressure, flow rate and speed lie respectively between 5 and 20 bar, 1 and 10 m3/s and 30 and 60 m/s.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1005330A NL1005330C2 (en) | 1997-02-20 | 1997-02-20 | Method for making a trench below the waterline and device for this. |
NL1005330 | 1997-02-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0860556A1 true EP0860556A1 (en) | 1998-08-26 |
Family
ID=19764461
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98200227A Withdrawn EP0860556A1 (en) | 1997-02-20 | 1998-01-27 | Method for making a trench under water and device therefor |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0860556A1 (en) |
NL (1) | NL1005330C2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002090667A1 (en) * | 2001-05-09 | 2002-11-14 | Progenitive Services Limited | Apparatus for and method of propelling fluid |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29195C (en) * | R. STONE in New-York, V. St. A | Hydraulic dredging apparatus for clearing sandbanks and the like | ||
US1698515A (en) * | 1926-03-18 | 1929-01-08 | Stewart Robert Thomson | Method of and means for use in dredging |
GB2038902A (en) * | 1979-01-04 | 1980-07-30 | Vnii Gidrotekh Meliorat | Machine for Cleaning Reclamation Channels from Deposits |
EP0243994A1 (en) * | 1986-04-14 | 1987-11-04 | Reijer Nicolaas Van Weezenbeek | Device for the displacement of sediment under water and process for the use of such a device |
EP0548707A1 (en) * | 1991-12-24 | 1993-06-30 | ANTON MÜSING GmbH & CO. KG | Method and device to increase the water depth of a watercourse |
-
1997
- 1997-02-20 NL NL1005330A patent/NL1005330C2/en not_active IP Right Cessation
-
1998
- 1998-01-27 EP EP98200227A patent/EP0860556A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29195C (en) * | R. STONE in New-York, V. St. A | Hydraulic dredging apparatus for clearing sandbanks and the like | ||
US1698515A (en) * | 1926-03-18 | 1929-01-08 | Stewart Robert Thomson | Method of and means for use in dredging |
GB2038902A (en) * | 1979-01-04 | 1980-07-30 | Vnii Gidrotekh Meliorat | Machine for Cleaning Reclamation Channels from Deposits |
EP0243994A1 (en) * | 1986-04-14 | 1987-11-04 | Reijer Nicolaas Van Weezenbeek | Device for the displacement of sediment under water and process for the use of such a device |
EP0548707A1 (en) * | 1991-12-24 | 1993-06-30 | ANTON MÜSING GmbH & CO. KG | Method and device to increase the water depth of a watercourse |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002090667A1 (en) * | 2001-05-09 | 2002-11-14 | Progenitive Services Limited | Apparatus for and method of propelling fluid |
Also Published As
Publication number | Publication date |
---|---|
NL1005330C2 (en) | 1998-08-24 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE DK ES FR GB IE IT NL PT |
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AX | Request for extension of the european patent |
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17P | Request for examination filed |
Effective date: 19990225 |
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AKX | Designation fees paid |
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RBV | Designated contracting states (corrected) |
Designated state(s): BE DE DK ES FR GB IE IT NL PT |
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17Q | First examination report despatched |
Effective date: 20001013 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20010224 |