EP2959062B1 - Konsolidierung von böden - Google Patents

Konsolidierung von böden Download PDF

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Publication number
EP2959062B1
EP2959062B1 EP14708110.3A EP14708110A EP2959062B1 EP 2959062 B1 EP2959062 B1 EP 2959062B1 EP 14708110 A EP14708110 A EP 14708110A EP 2959062 B1 EP2959062 B1 EP 2959062B1
Authority
EP
European Patent Office
Prior art keywords
drain element
drain
pump
ground
providing
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.)
Not-in-force
Application number
EP14708110.3A
Other languages
English (en)
French (fr)
Other versions
EP2959062A1 (de
Inventor
Catrinus VAN DER MEER
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.)
Van Oord Dredging And Marine Contractors Bv
Original Assignee
Van Oord Dredging And Marine Contractors Bv
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Publication date
Application filed by Van Oord Dredging And Marine Contractors Bv filed Critical Van Oord Dredging And Marine Contractors Bv
Publication of EP2959062A1 publication Critical patent/EP2959062A1/de
Application granted granted Critical
Publication of EP2959062B1 publication Critical patent/EP2959062B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water

Definitions

  • the invention relates to a method for consolidating water-containing ground by extracting and discharging water from the ground.
  • Known methods may apply a load onto the ground by an additional thickness of a (ground) material, such as sand.
  • the additional layer that can several meters thick applies a vertical force onto the ground, by which the water is pushed out of the ground.
  • Such process can be assisted by providing drains into the ground. It is known to vertically provide prefabricated drains into the ground. Such drains have a relatively small cross-sectional surface.
  • An example is a corrugated plate having a width of about 10 centimeters with corrugations of about 5 millimeters deep, which may surrounded by a cloth-like material that is permeable to water to allow water to be collected into but keep ground substantially out of the corrugations.
  • Ground water is collected within the drains and expelled at their top sides.
  • the prefabricated drains are applied into the ground by a known method for driving a hollow mandrel into the ground and can be provided into the ground to depths of several tens of meters, for instance, 60 meters. However, it requires rather long time spans in the order of several months or even more than a year to have extracted a sufficient amount of water from the ground such that it has substantially consolidated.
  • drainage trenches are provided in the ground by removing ground material.
  • the drainage trenches are filled with a draining material, like sand, and a pump can be provided at the bottom of the trenches within a surrounding tube like structure.
  • Ground water is collected within the trench and around the pump to be pumped away and expelled at top level.
  • a vacuum provided by the pumps within the trenches will assist in collecting water into the trenches, but leakage readily occurs through which vacuum will be lost.
  • This known method has a limited depth range of only 7 to 8 meters in which it can be applied for consolidating ground. Removal of ground material further requires to material to be transported away or to be left on site where it may obstruct or hinder on-site activities.
  • drains are applied vertically in the ground.
  • the drains are connected at their top sides collectively to a pump for entraining ground water from the drains. This can be done by connecting the vertical channels to a horizontal drain that is connected to a pump or otherwise connect the individual drains to a collective pump.
  • leakage of the known drain system easily occurs, which drastically reduces the pumping capacity.
  • the drains and their connections at the top have to be installed individually in the ground in a non-continuous process, which is not efficient and only a limited amount of water can be pumped away.
  • At least one of these objects is achieved by a method for consolidating water-containing ground, the method comprising
  • the pump is provided to a bottom end of the drain element, which is effective is very effective in pumping ground water out of the full drain element and providing a vacuum along the drain element to efficiently and effectively provide a vacuum in the ground.
  • the drain element is provided into the ground in a substantially vertical orientation to reach largest depths and not to damage drain element with the pump and its connections.
  • the pump is a gas-driven Venturi pump, especially an air-driven Venturi pump.
  • a gas-driven Venturi pump especially an air-driven Venturi pump.
  • Such pump can be made quite small and proves very effective with respect to its size, although an air-driven Venturi pump is generally not considered for pumping away liquid.
  • the drain element comprises a drain member having a corrugated cross-section transverse to the longitudinal direction of the drain element.
  • Such drain element can be made cost-effectively and with small overall cross-section for easy and efficient application in the ground, while providing very good collection and transport characteristics for water and air. Further, it has shown to be effective in combination with a pump.
  • the drain member has a plate-like configuration having corrugations of the corrugated cross-section in a width direction and having a thickness corresponding a height of the corrugations of the corrugated cross-section.
  • Such drain member proves most efficient in manufacturing, application in the ground and fluid collection and transport properties.
  • the drain element comprises a fluid-permeable covering that is impermeable to the ground, and wherein the pump is provided inside the covering.
  • the drain member is provided inside the covering.
  • Such covering keeps the pump and also corrugation of the drain member free from the ground and ground particles to not obstruct the pump or the channels formed by the corrugations.
  • each drain element is provided with a pump in dependence of the permeability and water level in the ground.
  • the method further comprises
  • the method further comprises separating the determined length(s) of drain element(s) from the continuous stretch of drain element, to have the required length(s) immediately available.
  • a corresponding drain element for use in a method according to any one of the preceding claims, the drain element having an elongated configuration, allowing both collection and transport of fluid along a longitudinal direction of the drain element, and comprising a pump constructed and arranged to discharge collected fluid from the drain element, the drain element being configured to be provided with the pump into the ground to be consolidated.
  • the pump is arranged within the drain element.
  • the drain element is configured such that the pump is provided at a bottom end of the drain element.
  • the pump is a gas-driven Venturi pump, especially an air-driven Venturi pump.
  • the drain element comprises a drain member having a corrugated cross-section transverse to the longitudinal direction of the drain element.
  • the drain member has a plate-like configuration having corrugations of the corrugated cross-section in a width direction and having a thickness corresponding a height of the corrugations of the corrugated cross-section.
  • the drain element comprises a fluid-permeable covering that is impermeable to the ground, and wherein the pump is provided inside the covering.
  • the drain member is provided inside the covering.
  • a drain element 10 is shown provided in ground G to be consolidated in figure 1 .
  • the elongated drain element has a length D of, for instance, 60 meters in its longitudinal vertical direction.
  • a bottom side 10A of the drain element is therefore provided at a depth D of 60 meters below a top level of the ground G. Water present in the ground will be collected by the drain element as is shown by arrows C in the figure.
  • the drain element is provided with a pump 20 having a supply connection 21 and a discharge connection 22.
  • the discharge connection 22 is connected to pump 20 by a corner piece 22A, which prevents the discharge connection from being bend.
  • the supply connection 21 is connected to a control system 25 and the discharge connection 22 discharge water collected into a discharge basin 26 in the embodiment shown.
  • FIGs 2 and 3 shows the drain element 10 in more detail.
  • Figure 2 shows the bottom end 10A of the drain element and figure 3 shows a cross-section.
  • the drain element 10 comprises a plate-like drain member 11 that is corrugated in a cross-section transverse to the longitudinal direction.
  • the drain member 11 has a width W of, for example, 10 centimeters in a direction transverse to the longitudinal direction.
  • the corrugations 11A of the corrugated cross-section have a height H of, for instance 3 to 5 millimeters in a direction transverse to both the width direction and the longitudinal direction.
  • a corrugation has a width W1 of, for instance, also 3 to 5 millimeters.
  • the corrugations 11A provide channels 11B in the longitudinal direction.
  • the drain element 11 further comprises a covering 12 of cloth-like material, which geotextile or geotextile-like materials are known as such, that is permeable to water and air but substantially not permeable to ground or ground particles. Water and air contained in the ground can thus enter into the channels 11B of the drain element through the covering while ground particles are blocked.
  • the covering is provided such that it keeps the channels 11B formed by the corrugations 11A open for transport of water and air along the channels in the longitudinal direction.
  • the pump 20 is provided at the bottom end 10A of the drain element.
  • the pump is an air-driven Venturi pump, which is shown in more detail in figure 4 .
  • Compressed air is supplied in the direction of arrow Ai through supply line 21 from a known control system 25 shown in figure 1 .
  • the compressed air enters the pump through a nozzle 21A in the direction of an outlet 20A of the pump.
  • the pump action is in the direction of arrow Ap.
  • An underpressure or vacuum is created at entrance 20A of the pump by the action of compressed air leaving the nozzle.
  • water and air at the bottom of the drain element 10 is pumped through the inlet 20A of the pump towards its outlet 20B and into the discharge connection 22.
  • a top side 11b of the drain element is provided more than 0.5 meters below the surface level of the ground G, for instance, by 2 meters, so that the channels 11B are closed at their tops ends by a layer of ground.
  • the top ends of the drain elements can be closed-off by, for instance, applying a foil, or in any other suitable fashion, when sticking out above or ending close to the surface level of the ground. Loss of vacuum at the top end of the drain elements is therefore prevented in an easy manner. Would any leakage occur for one drain element. It will not affect any other drain element.
  • FIG. 5 shows multiple drain elements 10 provided in the ground G.
  • a pump 20 and supply and discharge connections 21 and 22 are not shown in figure 5 .
  • a crane 50 with a mast 51 is used to bring the drain elements into the ground by a driving method which is known as such.
  • the drain elements are provided on a roll, as shown in figure 6 , to the crane. At the location where the drain elements are to be provided into the ground a drain element is taken from the roll, provided into the crane and subsequently applied into the ground.
  • a continuous stretch of prefabricated drain element yet without pump is initially provided on a roll 61 as shown in figure 6 .
  • a length D of the continuous stretch is taken from the roll.
  • the length D corresponds to the length of a drain element to be provided into the ground as shown in figure 1 .
  • the covering 12 of the continuous stretch is opened at the top and bottom sides of that length D.
  • a pump 20 with supply and discharge connections 21, 22 is provided to the length D of drain element within the covering such that the pump is at the bottom side and the connections 21, 22 exit the drain element at the top side.
  • the continuous stretch of drain element is provided on another roll 62.
  • the length D of drain element is completely separated from the continuous stretch and provided onto roll 62.
  • separated lengths of drain elements with pumps are collected in another manner and provided to the locations where the drain elements are to be provided into the ground. This can all be carried out under controlled circumstances, like in a separate building or container on the project location.
  • a continuous stretch of drain element is easily provided on a roll, and such roll and pumps and connections are easily provided to the area of which the ground is to be consolidated for preparation of drain elements with pumps on the spot.
  • the roll 62 with prepared drain elements can be provided onto the crane 50 to supply drain elements from the roll as required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Agronomy & Crop Science (AREA)
  • Soil Sciences (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (16)

  1. Verfahren zum Verfestigen von wasserhaltigem Boden (G), wobei das Verfahren umfasst:
    - Bereitstellen eines länglichen Ableitelementes (10), wobei das Ableitelement sowohl Auffangen als auch Transport von Flüssigkeit in einer Längsrichtung des Ableitelementes zulässt;
    - Anordnen einer Pumpe (20) an einem unteren Ende (10A) des Ableitelementes, wobei die Pumpe eine gasbetriebene Venturi-Pumpe, insbesondere eine luftbetriebene Venturi-Pumpe, ist;
    - Anordnen des Ableitelementes mit der Pumpe in dem zu verfestigenden Boden (G); und
    - Antreiben der Pumpe, um aufgefangene Flüssigkeit aus dem Ableitelement auszuleiten.
  2. Verfahren nach Anspruch 1, wobei das Ableitelement (10) in einer im Wesentlichen vertikalen Ausrichtung in dem Boden (G) angeordnet wird.
  3. Verfahren nach einem der vorangehenden Ansprüche, wobei das Ableitelement (10) ein Ableitteil (11) umfasst, das einen gewellten Querschnitt quer zu der Längsrichtung des Ableitelementes hat.
  4. Verfahren nach Anspruch 3, wobei das Ableitteil (11) eine plattenartige Form hat, die Wellen des gewellten Querschnitts in einer Breitenrichtung aufweist und eine Dicke hat, die einer Höhe (H) der Wellen (11A) des gewellten Querschnitts entspricht.
  5. Verfahren nach einem der vorangehenden Ansprüche, wobei das Ableitelement (10) eine flüssigkeitsdurchlässige Abdeckung (12) umfasst, die für den Boden (G) undurchlässig ist, und sich die Pumpe (20) im Inneren der Abdeckung befindet.
  6. Verfahren nach Anspruch 5 und Anspruch 3 oder 4, wobei sich das Ableitteil (11) im Inneren der Abdeckung (12) befindet.
  7. Verfahren nach einem der voran- gehenden Ansprüche, wobei mehrere Ableitelemente (10) in dem Boden (G) angeordnet werden und jedes Ableitelement mit einer Pumpe (20) versehen wird.
  8. Verfahren nach einem der vorangehenden Ansprüche, wobei das Verfahren des Weiteren umfasst:
    - Anordnen eines oberen Endes (10B) des Ableitelementes (10) wenigstens 0,5 m unterhalb eines Oberflächeniveaus des Bodens (G); und/oder
    - Verschließen eines oberen Endes (10B) des Ableitelementes (10), so beispielsweise durch Anordnen einer Folie über dem oberen Ende.
  9. Verfahren nach einem der vorangehenden Ansprüche, wobei das Verfahren des Weiteren umfasst:
    - Bereitstellen eine Rolle (61) eines durchgehenden Abschnitts des Ableitelementes (10) ohne Pumpe/n;
    - Bestimmen einer erforderlichen Länge bzw. erforderlicher Längen (D) des Ableitelementes/der Ableitelemente, die einer Tiefe des Bodens (G) entspricht/entsprechen, in dem das/die Ableitelement/e angeordnet werden soll/sollen;
    - Abrollen von Teilen des durchgehenden Abschnitts des Ableitelementes von der Rolle entsprechend der/den bestimmten Länge/n; und
    - Anordnen von Pumpen (20) an Positionen, die der/den bestimmten Länge/n des Ableitelementes/der Ableitelemente entsprechen.
  10. Verfahren nach Anspruch 9, wobei das Verfahren des Weiteren umfasst:
    - Aufrollen des Ableitelementes/der Ableitelemente mit Pumpe/n auf eine Rolle (62);
    - Bereitstellen der Rolle an Positionen, an denen Ableitelemente in dem Boden angeordnet werden sollen.
  11. Verfahren nach Anspruch 9 oder 10, wobei das Verfahren des Weiteren umfasst:
    - Abtrennen der bestimmten Länge/n des Ableitelementes/der Ableitelemente von dem durchgehenden Abschnitt des Ableitelementes.
  12. Ableitelement (10) zum Einsatz bei einem Verfahren nach einem der vorangehenden Ansprüche, wobei das Ableitelement eine längliche Form hat, die sowohl Auffangen als auch Transport von Flüssigkeit in einer Längsrichtung des Ableitelementes zulässt, und eine Pumpe (20) umfasst, die so aufgebaut und eingerichtet ist, dass sie aufgefangene Flüssigkeit aus dem Ableitelement ausleitet, das Ableitelement so ausgeführt ist, dass sich die Pumpe (20) an einem unteren Ende (10A) des Ableitelementes (10) befindet, und so ausgeführt ist, dass es mit der Pumpe in dem zu verfestigenden Boden (G) angeordnet ist, wobei die Pumpe (20) eine gasbetriebene Venturi-Pumpe, insbesondere eine luftbetriebene Venturi-Pumpe, ist.
  13. Ableitelement nach Anspruch 12, wobei die Pumpe (20) innerhalb des Ableitelementes angeordnet ist.
  14. Ableitelement nach Anspruch 12 oder 13, wobei das Ableitelement (10) ein Ableitteil (11) umfasst, das einen gewellten Querschnitt quer zu der Längsrichtung des Ableitelementes hat, und das Ableitteil (11) optional eine plattenartige Form hat, die Wellen des gewellten Querschnitts in einer Breitenrichtung aufweist und eine Dicke hat, die einer Höhe (H) der Wellen (11A) des gewellten Querschnitts entspricht.
  15. Ableitelement nach einem der Ansprüche 12 bis 14, wobei das Ableitelement (10) eine flüssigkeitsdurchlässige Abdeckung (12) umfasst, die für den Boden (G) undurchlässig ist, und wobei sich die Pumpe (20) im Inneren der Abdeckung befindet.
  16. Ableitelement nach den Ansprüchen 14 und 15, wobei sich das Ableitteil (11) im Inneren der Abdeckung (12) befindet.
EP14708110.3A 2013-02-22 2014-02-21 Konsolidierung von böden Not-in-force EP2959062B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2010349A NL2010349C2 (en) 2013-02-22 2013-02-22 Method for consolidating water-containing ground, and drain element for use in such method.
PCT/NL2014/050107 WO2014129899A1 (en) 2013-02-22 2014-02-21 Method for consolidating water-containing ground, and drain element for use in such method

Publications (2)

Publication Number Publication Date
EP2959062A1 EP2959062A1 (de) 2015-12-30
EP2959062B1 true EP2959062B1 (de) 2017-06-14

Family

ID=48142892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14708110.3A Not-in-force EP2959062B1 (de) 2013-02-22 2014-02-21 Konsolidierung von böden

Country Status (5)

Country Link
EP (1) EP2959062B1 (de)
MY (1) MY175229A (de)
NL (1) NL2010349C2 (de)
SG (1) SG11201506594VA (de)
WO (1) WO2014129899A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6439110B2 (ja) * 2014-10-31 2018-12-19 五洋建設株式会社 エジェクターポンプを使用した地盤改良用負圧駆動装置
JP6622502B2 (ja) * 2015-07-30 2019-12-18 東洋建設株式会社 水底地盤の地下水吸引装置、水底部の泥土及びヘドロの減容化方法、海底地盤中のメタンハイドレート回収装置、及び方法
CN108894240A (zh) * 2018-06-26 2018-11-27 兰州理工大学 可回收基坑排水系统及回收方法
CN109537570A (zh) * 2018-07-25 2019-03-29 广州市盛洲地基基础工程有限公司 一种软土地基排水固结用强排水板
CN109056693A (zh) * 2018-07-25 2018-12-21 广州市盛洲地基基础工程有限公司 一种强排水预压方法及装置
CN109537571B (zh) * 2018-11-09 2021-04-30 广州市盛洲地基基础工程有限公司 一种软土地基处理用的强排泵

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2627202B1 (fr) * 1988-02-15 1992-04-17 Menard Soltraitement Procede et dispositif de consolidation de terrains

Also Published As

Publication number Publication date
WO2014129899A1 (en) 2014-08-28
MY175229A (en) 2020-06-16
NL2010349C2 (en) 2014-08-25
EP2959062A1 (de) 2015-12-30
SG11201506594VA (en) 2015-09-29

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