EP2959062A1 - Verfahren zur konsolidierung von wasserhaltigem boden und abflusselement zur verwendung in diesem verfahren - Google Patents
Verfahren zur konsolidierung von wasserhaltigem boden und abflusselement zur verwendung in diesem verfahrenInfo
- Publication number
- EP2959062A1 EP2959062A1 EP14708110.3A EP14708110A EP2959062A1 EP 2959062 A1 EP2959062 A1 EP 2959062A1 EP 14708110 A EP14708110 A EP 14708110A EP 2959062 A1 EP2959062 A1 EP 2959062A1
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining 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.
- ground a material that can several meters thick.
- 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
- drain element allowing both collection and transport of fluid along a longitudinal direction of the drain element
- the drain elements can be applied into the ground by known methods and prove to be very efficient in consolidating ground and also very cost-effective. It allows collection, transport and pumping away of both water and air as fluids from the ground. A vacuum is created within the ground for enhanced consolidation. Since the ground water level is lowered, water flow towards the drains will be assisted by gravity forces.
- 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
- a continuous stretch of drain element without pumps can be effectively provided on such roll.
- the required length(s) can be determined on-site. On-site the stretch is easily unrolled and the pump(s) added to the required length(s) of drain element(s).
- Such roll can be prepared both on-site or off-site, as required, and subsequently provided to the actual location where the drain element(s) are to provided into the ground for effective handling of the drain element(s).
- 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.
- Figure 1 schematically shows a drain element according to the invention provided in ground to be consolidated
- Figure 2 shows a detail of a bottom end of the drain element of figure 1, part of a coverage of the drains shown removed;
- Figure 3 shows a cross-section of the drain element of figures 1 and 2;
- Figure 4 schematically shows a pump of the drain element in a detailed view
- Figure 5 shows an installation to provide drain elements into the ground and multiple drain elements provided in the ground
- Figure 6 shows rolls on which a continuous stretch of drain element according to the invention is provided.
- 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
- 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 11 A 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 Wl of, for instance, also 3 to 5 millimeters.
- the corrugations 11 A provide channels 1 IB 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 1 IB of the drain element through the covering while ground particles are blocked.
- the covering is provided such that it keeps the channels 1 IB formed by the corrugations 11 A 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 21 A 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 20 A of the pump towards its outlet 20B and into the discharge connection 22.
- the water and air is transported upwards through discharge connection 22, shown by arrow Ao, towards and out into the basin 26. Air will enter into the atmosphere but the water will be collected in the basin.
- the discharged water may be provided elsewhere as well when leaving the discharge connection 22.
- a top side 1 lb 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 1 IB 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.
- Figure 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)
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 true EP2959062A1 (de) | 2015-12-30 |
EP2959062B1 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)
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)
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 |
-
2013
- 2013-02-22 NL NL2010349A patent/NL2010349C2/en not_active IP Right Cessation
-
2014
- 2014-02-21 SG SG11201506594VA patent/SG11201506594VA/en unknown
- 2014-02-21 WO PCT/NL2014/050107 patent/WO2014129899A1/en active Application Filing
- 2014-02-21 EP EP14708110.3A patent/EP2959062B1/de not_active Not-in-force
- 2014-02-21 MY MYPI2015002081A patent/MY175229A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2014129899A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2014129899A1 (en) | 2014-08-28 |
MY175229A (en) | 2020-06-16 |
EP2959062B1 (de) | 2017-06-14 |
NL2010349C2 (en) | 2014-08-25 |
SG11201506594VA (en) | 2015-09-29 |
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