WO2016055119A1 - Procédé de dragage par érosion - Google Patents

Procédé de dragage par érosion Download PDF

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Publication number
WO2016055119A1
WO2016055119A1 PCT/EP2014/071735 EP2014071735W WO2016055119A1 WO 2016055119 A1 WO2016055119 A1 WO 2016055119A1 EP 2014071735 W EP2014071735 W EP 2014071735W WO 2016055119 A1 WO2016055119 A1 WO 2016055119A1
Authority
WO
WIPO (PCT)
Prior art keywords
deposit
water
sediment
vibrating plate
force
Prior art date
Application number
PCT/EP2014/071735
Other languages
German (de)
English (en)
Inventor
Egon Prexl
Original Assignee
Egon Prexl
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 Egon Prexl filed Critical Egon Prexl
Priority to PCT/EP2014/071735 priority Critical patent/WO2016055119A1/fr
Publication of WO2016055119A1 publication Critical patent/WO2016055119A1/fr

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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/006—Dredgers or soil-shifting machines for special purposes adapted for working ground under water not otherwise provided for
    • 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 and a device for removing stagnant sandy / schiuffige to silty deposits on the bottom surfaces of bodies of water.
  • sediments are made more fluid over a large area and can be combined with - or without hydropneumatic
  • the invention contributes to the solution of these problems.
  • the dredging method according to the invention can generally be used in combination with the known hydropneumatic methods, such as the suction dredger method or the water injection method, as well as independently.
  • Suction dredger methods are suitable for almost all types of sediment and have been widely described. Today, such methods are used in which the sucked mixture of solid and liquid components in the hold of the ships is partially separated, so that a portion of the sucked water can be returned to the water (Suction Hopper Dredging).
  • the layer thus treated (also referred to as a density layer) may have a suitable level difference on the
  • Dredging with the water injection device (WI-Sprayer) and the hopper dredger are reaching the limits of their performance especially in sandy / low silty sediments, with a linear grain distribution (especially of the sand fraction).
  • sandy / silty in the context of this description is meant the presence of sand together with clay particles.
  • FR 2 860 532 relates to methods for hydropneumatic removal of deposits i. W. by suction dredging. This is a technique for recovering the dredged material
  • the sediment to be removed can be loosened by means of a (possibly separate) vibrating device ("aiguilles vibrantes").
  • this proposal relates specifically and expressly not sandy sediments, but deposited silt and clay or clay, so deposits that consist essentially of the smallest particles and have a narrow particle size distribution (below 1 to a maximum of about 100 microns).
  • DE-OS 2 256 627 discloses a method for removing mud, but not sand. A "vibration effect" takes place here in that the entire cutting head is vibrated.
  • US 5,146,699 discloses a method for removing toxic sludge, so also not sand. There is no vibratory effect on the sediment here.
  • the apparently comparable devices (vibrator 86, frame 23) instead serve only for lateral movement of the shear device for cutting sediment chunks.
  • the state of the art can be significantly improved in terms of effort and effect.
  • An essential object of the invention is this improvement.
  • the aim is an effective mechanical energy input for all sediment compositions.
  • An essential aspect of the invention is to make variable the printing of the vibrating plate on the sediment surface (for example, by inflatable buoyancy bodies).
  • the vibrating plate without buoyancy deep into solid fine sands, but at the other extreme with much buoyancy to slide flat over mud surfaces. It can with little energy of
  • the necessary imprint on the sediment is roughly a few kg / m up to about 250 kg / m and may be e.g. can be easily controlled with inflatable commercial round fenders.
  • the mechanical force is preferably applied by shearing and shaking on the sediment surface. To optimize the energy use is in the
  • the optimal parameters can be easily determined by preliminary tests.
  • the technical device for reducing the viscosity is preferably installed on Wasserinj tion excavators, hopper dredgers and tractors. It consists for example of a bar-like lowerable device, which is up to 12 m long and is carried along the direction of travel of the ships resting on the sediment. Through this device, the mechanical energy is transmitted via vibrators, shaving heads, vibrators and eccentrics to the thixotropic sediment.
  • the respective use of the aforementioned various devices 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 method in processing processing direction before, and approximately parallel to, the water injection bar and reduces the viscosity.
  • the sediment is injected into the following injector nozzles
  • the effectiveness of the method is improved by variable pressure of the device on the sediment to be removed during the energy input.
  • the vibrating devices in particular vibrating plates, described in greater detail below and shown in the drawings, serve for this purpose. These are preferably mounted near the suction head or the water injection bar.
  • FIG. 1 A loading space suction dredge according to a first embodiment of the invention
  • Fig. 2 A water-injection excavator according to another embodiment of the invention.
  • FIGS. 3a-c show details of a preferred embodiment of a vibrating plate according to the invention
  • Fig. 1 shows a loading space suction dredger 1, which is provided with a suction tube 2.
  • the suction tube 2 carries a suction head 3, which receives sediment from the surface of the water bottom 4.
  • Fig. 2 shows a water injection excavator 5, which is provided with an injection tube 6.
  • the injection tube 6 carries a water injection bar 7, which enters water under pressure in the sediment.
  • Fig. 3 a shows such Trottelblech 9 in top view.
  • the Studttelblech is mainly (1 1) flat and has two upwardly inclined metal strips 1 l a, b at its (in the direction of movement) leading or trailing edge. Approximately in the center, a growing area 12 is provided for a vibrator (not shown). Near two opposite side edges are
  • Means 14 for attachment to a strut (10, see Fig. 1 and 2) are provided.
  • Fig. 3b shows the same Haittelblech 9 in view from below.
  • the flat lower major surface 15 rests on the sediment during use.
  • the metal strips 1 la, b (which can be produced by bending the sheet) prevent unwanted penetration into the sediment.
  • the vibrating plate 9 is provided on the underside with vibration lamellae 16, which penetrate into the sediment.
  • Fig. 3c shows the Hinttelblech 9 in side view (transverse to the direction of movement).
  • the croquttelbleche be fined on the struts 10 from the dredger 1, 2 on the sediment 4,8. It can be provided to adjust the pressure exerted by the Haittelbleche on the sediment. Via a pathogen, mechanically dynamic pulses are induced in the resonance area in the soil.
  • the Studttelbleche 9 are in certain, sufficiently large distances in front of the suction head 3 of the hopper dredger or before
  • a vibrating plate 9 consists in principle of steel plates from 2 sizes and a thickness of 8 mm. At the front I Ia and rear II b side of the sheets 9 are folded so that they can slide over the ground. Several of these Hinttelbleche 9 are movably attached to each other and pulled over the sediments at the bottom - up to the width of the working track of the dredgers. The size and thickness may vary depending on the nature of the sediment and speed of travel. At the sediment 4,8 facing the main surface 15 of the Hinttelbleche 9 steel flanges 6 are welded at different distances and dimensions along the pulling direction of the dredgers.
  • the dimensions and the distances are chosen so that these flanges completely penetrate into the sediment on this, and the supernatant water can penetrate tangentially into the loosened sediment mainly on the side of the vibrating plate.
  • the directed pressure of the protruding water body substantially supports the force of each on the
  • Pulse generator 12 By these cyclic impulses, the pore water pressure is successively increased, the sediment volume increases, the grain-to-grain pressure, the shear strength and thus the internal friction decreases. A quasi-soil liquefaction is created, which substantially facilitates the erosion and rearrangement by the conventional methods. As a result, consolidated, hard as well as thixotropic sediments in the water-saturated zone are faster, larger, more environmentally friendly and easier to relocate using the water injection process or the hopper dredger.
  • the vibrating plates 9 are mounted so far before the too strong water suction and pressure that animals are baffled and can escape.
  • the dredging work in the relevant time can only be done with the vibrating plate 9, without use of hydropneumatic agents are performed.
  • the currents in tidal waters and the respective water power counteract the sedimentation.
  • small sediment banks which hinder the navigation.
  • the sedimentation at these points can be temporarily counteracted with the dredging method according to the invention alone (ie without suction dredger or WI device), so as to obtain the necessary navigation depth.
  • the invention can be used as needed in solid sandy to muddy soils. Characteristic of the sedimentary sediments are predominantly fine sand fractions, which have a straight grain distribution. Experience has shown that this
  • Excavator method worked mostly with this optimal frequency. This can be determined in laboratory tests. The aim is to reduce the energy input when using the hydraulics. In pilot plant experiments is in the ratio of mechanical dynamic - to hydraulic energy input of 1: 700 KW / m 2 a performance increase of the excavator performance of 100% has been determined.
  • the resonance of the sediments to be relocated is sought. After initial measurements, these are usually 9 to 20 Hz.
  • the pore water in the sediment contributes to the depth of the sediment layer during the transmission of the fractions.
  • Sediment formations - crests to sediment valleys - may have a height difference of> 10 m and often have to be deepened quickly.
  • the crests are often removed with the dredgers and transferred to the wells.
  • Excavator method according to the invention can be worked faster, more spacious and cheaper in these areas. This is especially beneficial in tidal currents, where working hours are severely limited.
  • the pressure on the sediment is controllable, e.g. through the use of buoyancy bodies.

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 d'élimination de dépôts de sable et/ou de limon sur des surfaces au fond de cours d'eau, le cas échéant au moyen de procédés hydropneumatiques, en particulier par injection d'eau, dragage par succion ou similaire, dans lequel on soumet le dépôt de sable de limon, éventuellement avant l'application du procédé d'élimination hydropneumatique, à l'action d'une force qui réduit la viscosité du dépôt ; on fait varier la pression que les dispositifs, servant à l'action de la force, exercent sur le dépôt.
PCT/EP2014/071735 2014-10-10 2014-10-10 Procédé de dragage par érosion WO2016055119A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/071735 WO2016055119A1 (fr) 2014-10-10 2014-10-10 Procédé de dragage par érosion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/071735 WO2016055119A1 (fr) 2014-10-10 2014-10-10 Procédé de dragage par érosion

Publications (1)

Publication Number Publication Date
WO2016055119A1 true WO2016055119A1 (fr) 2016-04-14

Family

ID=51703150

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/071735 WO2016055119A1 (fr) 2014-10-10 2014-10-10 Procédé de dragage par érosion

Country Status (1)

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WO (1) WO2016055119A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10167609B1 (en) 2018-01-12 2019-01-01 Cashman Dredging & Marine Contracting Co., LLC Carouseling articulated dredge and barge
CN112942472A (zh) * 2021-02-01 2021-06-11 宁夏锦虹建设工程有限公司 一种水利工程作业面清淤设备及其使用方法
DE102020129000B3 (de) 2020-11-04 2022-02-24 Voith Patent Gmbh Vorrichtung zur Aufnahme von Sedimenten in Gewässern
DE102020133515B3 (de) 2020-12-15 2022-02-24 Voith Patent Gmbh Vorrichtung zur Aufnahme von Sedimenten in Gewässern

Citations (5)

* 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
FR2860532A1 (fr) * 2003-10-03 2005-04-08 Michel Poteur Dispositif pour le devasement sans pollution ni consommation d'eau notables
US20100083542A1 (en) * 2008-10-07 2010-04-08 Powers James M Remotely operated submerged dredging system
EP2484838A1 (fr) * 2011-02-08 2012-08-08 Egon Prexl Procédé d'excavation
US20130015696A1 (en) * 2010-03-30 2013-01-17 Zhongsheng Tang Hydraulic resonant breaking hammer

Patent Citations (5)

* 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
FR2860532A1 (fr) * 2003-10-03 2005-04-08 Michel Poteur Dispositif pour le devasement sans pollution ni consommation d'eau notables
US20100083542A1 (en) * 2008-10-07 2010-04-08 Powers James M Remotely operated submerged dredging system
US20130015696A1 (en) * 2010-03-30 2013-01-17 Zhongsheng Tang Hydraulic resonant breaking hammer
EP2484838A1 (fr) * 2011-02-08 2012-08-08 Egon Prexl Procédé d'excavation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10167609B1 (en) 2018-01-12 2019-01-01 Cashman Dredging & Marine Contracting Co., LLC Carouseling articulated dredge and barge
US10920398B2 (en) 2018-01-12 2021-02-16 Cashman Dredging & Marine Contracting Co., LLC Carouseling articulated dredge and barge
DE102020129000B3 (de) 2020-11-04 2022-02-24 Voith Patent Gmbh Vorrichtung zur Aufnahme von Sedimenten in Gewässern
DE102020133515B3 (de) 2020-12-15 2022-02-24 Voith Patent Gmbh Vorrichtung zur Aufnahme von Sedimenten in Gewässern
CN112942472A (zh) * 2021-02-01 2021-06-11 宁夏锦虹建设工程有限公司 一种水利工程作业面清淤设备及其使用方法

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