EP2683878A1 - Procédé d'excavation tix - Google Patents

Procédé d'excavation tix

Info

Publication number
EP2683878A1
EP2683878A1 EP12703693.7A EP12703693A EP2683878A1 EP 2683878 A1 EP2683878 A1 EP 2683878A1 EP 12703693 A EP12703693 A EP 12703693A EP 2683878 A1 EP2683878 A1 EP 2683878A1
Authority
EP
European Patent Office
Prior art keywords
deposit
water
silty
sandy
hydropneumatic
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Withdrawn
Application number
EP12703693.7A
Other languages
German (de)
English (en)
Inventor
Egon Prexl
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP12703693.7A priority Critical patent/EP2683878A1/fr
Publication of EP2683878A1 publication Critical patent/EP2683878A1/fr
Withdrawn legal-status Critical Current

Links

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
    • E02F3/9287—Vibrating suction heads

Definitions

  • the invention relates to a method and a device for removal
  • water is injected under pressure into the surface layer of the waterbed to be removed in order to reduce the viscosity of the same
  • the layer thus treated (also referred to as a density layer) can flow off over a suitable level difference at the bottom of the water.
  • Fine sands are common because of the naturally occurring longitudinal classification in waters. They are difficult to mobilize with the known hydropneumatic process mentioned above.
  • Dredging impedes what statistically leads to a greater risk of accidents.
  • a method is defined for better mobilization of fine-grained, sandy and / or silty sediments in bodies of water during the rearrangement, which makes use of the thixotropic properties of such sediments.
  • thixotropy refers to a state in fine-grained, mostly sandy / clayey sediments in which reversible viscosity differences occur due to mechanical stress. Typical is a change from solid to liquid by vibration with subsequent return to the solid state.
  • Grain packets are reduced by induced water.
  • the Reynolds number provides information about the flow state. Physically important is the boundary layer analysis of the solid-liquid phase. Within longitudinal flowed Walls (particle walls) act in a very thin layer, the boundary layer or friction layer, strong frictional forces.
  • the boundary layer thickness is essential for the frictional forces that must be expended when transporting the sediments.
  • the kinematic and dynamic viscosity of the semi-stable sediment is significantly reduced in the short term by targeted mechanical forces acting on the thixotropic medium before the hydropneumatic action by the aforementioned dredging method on the sediment.
  • the mechanical force is preferably applied by shearing and shaking on the sediment surface.
  • a resonance is sought in the relocated sediments. The optimal parameters can be easily determined by preliminary tests.
  • Influence on the physical boundary layers reduces the energy input as the stability and the inertia of the sediments to be relieved are reduced.
  • shocks and shears in thixotropic sediments temporarily and partially decrease their viscosity, which makes them difficult to remove by conventional excavator methods
  • Deposits can be done faster and more energy efficient.
  • the technical device for reducing the viscosity is preferably installed on water injection dredgers, hopper dredgers and tractors. It consists of an example bar-like lowerable
  • Different equipment depends on the sediment quality to be processed and is selected according to the best efficiency.
  • the device is z. B. in the water injection process in
  • An advantage of this combination method is that, compared to the known WI and Hopper method, significantly more thixotropic sediment per unit time can be mobilized.
  • Impact number term from physical chemistry; a mathematical formula by which the frequency of two or more chemical reactants can be calculated.
  • V volume [m 3 ]
  • n number [1]
  • T temperature in ° Kelvin
  • ⁇ kinematic viscosity [m 2 / s]

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un procédé destiné à retirer des dépôts de sable et/ou de limon sur des surfaces de cours d'eau au moyen de procédés hydropneumatiques, en particulier d'injection d'eau, d'un dragage suceur ou similaire, caractérisé en ce qu'on expose le dépôt de sable/de limon à retirer à l'exercice d'une force diminuant la viscosité du dépôt, avant d'appliquer le procédé de retrait hydropneumatique.
EP12703693.7A 2011-02-08 2012-02-01 Procédé d'excavation tix Withdrawn EP2683878A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12703693.7A EP2683878A1 (fr) 2011-02-08 2012-02-01 Procédé d'excavation tix

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11153674A EP2484838A1 (fr) 2011-02-08 2011-02-08 Procédé d'excavation
EP12703693.7A EP2683878A1 (fr) 2011-02-08 2012-02-01 Procédé d'excavation tix
PCT/EP2012/000449 WO2012107180A1 (fr) 2011-02-08 2012-02-01 Procédé d'excavation tix

Publications (1)

Publication Number Publication Date
EP2683878A1 true EP2683878A1 (fr) 2014-01-15

Family

ID=44201175

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11153674A Withdrawn EP2484838A1 (fr) 2011-02-08 2011-02-08 Procédé d'excavation
EP12703693.7A Withdrawn EP2683878A1 (fr) 2011-02-08 2012-02-01 Procédé d'excavation tix

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP11153674A Withdrawn EP2484838A1 (fr) 2011-02-08 2011-02-08 Procédé d'excavation

Country Status (2)

Country Link
EP (2) EP2484838A1 (fr)
WO (1) WO2012107180A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016055119A1 (fr) * 2014-10-10 2016-04-14 Egon Prexl Procédé de dragage par érosion

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2256627A1 (de) * 1972-11-17 1974-05-22 Held & Francke Bau Ag Verfahren zum mischen von schlammartigen medien mit wasser und zum transport solcher mischungen und vorrichtung zur durchfuehrung solcher verfahren
US5146699A (en) * 1991-12-05 1992-09-15 Ellicott Machine Corporation Auger dredge specially adapted to removal of toxic sediment
FR2860532B1 (fr) * 2003-10-03 2007-04-27 Michel Poteur Dispositif pour le devasement sans pollution ni consommation d'eau notables
DE202009018834U1 (de) 2009-06-12 2014-02-21 Thorsten Bolls Schleppkopfsaugbagger zur Durchführung der Sediment-Transport-Baggerung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012107180A1 *

Also Published As

Publication number Publication date
WO2012107180A1 (fr) 2012-08-16
EP2484838A1 (fr) 2012-08-08

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