EP1182355A1 - Einrichtung zur Tiefbodendrainage - Google Patents

Einrichtung zur Tiefbodendrainage Download PDF

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Publication number
EP1182355A1
EP1182355A1 EP01440281A EP01440281A EP1182355A1 EP 1182355 A1 EP1182355 A1 EP 1182355A1 EP 01440281 A EP01440281 A EP 01440281A EP 01440281 A EP01440281 A EP 01440281A EP 1182355 A1 EP1182355 A1 EP 1182355A1
Authority
EP
European Patent Office
Prior art keywords
chamber
drain
liquid
compressed air
pipe
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
Application number
EP01440281A
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English (en)
French (fr)
Other versions
EP1182355B1 (de
Inventor
Jean-Claude Gress
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.)
Groupe Ress Sarl
Original Assignee
Groupe Ress Sarl
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Filing date
Publication date
Application filed by Groupe Ress Sarl filed Critical Groupe Ress Sarl
Publication of EP1182355A1 publication Critical patent/EP1182355A1/de
Application granted granted Critical
Publication of EP1182355B1 publication Critical patent/EP1182355B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
    • F04F1/06—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped
    • F04F1/08—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped specially adapted for raising liquids from great depths, e.g. in wells
    • 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 present invention relates to a device for draining deep soil at means of at least one drain, said drain comprising at least one chamber closed in its lower part by a lower partition comprising at least one valve arranged to open when the room is under vacuum and to close when the room is overpressure relative to the outside, the chamber comprising at least one detector level of the liquid to be evacuated through the drain within said chamber, at least one compressed air supply hose connected to a compressed air supply and at least one hose for discharging liquid discharged from said chamber by compressed air ending in the lower zone of said chamber.
  • a device of this kind can be particularly suitable for draining soil following a deep landslide. Indeed, during a landslide whose shear surface is located at a significant depth, that is to say greater at about ten meters, stabilization techniques are very limited and it is often necessary to be content to follow the deformation without being able to stabilize it. Given the huge masses to be stabilized, the mechanical stabilization solutions are much too heavy.
  • Pumping systems are also very useful for pumping more liquids lighter than the water floating on the surface of the water table.
  • Hydrocarbons being lighter than water, they float on the surface of the water table and form an upper layer.
  • the existing drainage and pumping systems pump a large amount of water from the possibly mixed groundwater to hydrocarbons. This mixture must therefore be treated in settling tanks bulky which considerably increases the cost and duration of the operation.
  • German patent DE-B-1 242 516 a device such as described in the preamble.
  • the pumping chamber extends to the upper part of the drain and therefore defines a large volume which must be supplied with compressed air to drain the liquid from the drain.
  • the device uses alternately in the room pumping compressed air or a vacuum, to continuously link the liquid filling and evacuation phases. There may then be a unnecessary air consumption if there is no liquid to pump in the ground so that compressed air consumption is not limited to drainage needs. More especially it can also cause a dysfunction of the drain when the flow to be extracted is discontinuous and if the liquid does not rise for a certain time down to the upper room area.
  • the drain is also connected to a suction source putting the outside of the pumping chamber under vacuum promoting the entry of liquid in the lower part of the drain which further complicates more operation of this drain. Due to its high energy consumption and particularly in compressed air, this drain is therefore expensive to implement and is not suitable for deep water use.
  • the present invention aims to overcome these drawbacks by proposing a device innovative, simple and economical which allows to drain a soil at great depth, able to operate at almost zero and / or discontinuous flow rates, usable with liquids contaminated with impurities, allowing to drain liquids floating on the surface another liquid deep in the ground while requiring only drilling of small diameters, by limiting energy consumption and in particular by adjusting the consumption of compressed air according to the quantity of liquid to be evacuated.
  • the invention relates to a device of the kind indicated in the preamble, characterized in that the chamber is closed in its upper part by a partition upper disposed deep in the drain, said upper partition comprising at least two passages to receive at least the level detector and the hose compressed air inlet, in that said compressed air inlet pipe ends in the upper zone of the chamber, and in that the level detector is constituted by a electric cable three conductors each terminating in a contact and leading to different levels, respectively a first contact in the vicinity of the game bottom of the chamber below the liquid discharge pipe, a second contact slightly above the liquid discharge pipe then a third contact near the end of the compressed air supply hose.
  • the level detector is connected to a control of electrically powered solenoid valve and itself connected to a three solenoid valve channels arranged to inject compressed air when the level of liquid in the chamber reaches the third contact and to stop the injection of compressed air when the liquid level drops below the second contact.
  • the solenoid valve can be connected to a reserve of compressed air supplied by a compressor.
  • the liquid discharge pipe advantageously comprises at least one non-return valve on the side of its end terminating in the chamber.
  • This drain pipe liquid can be directed into a drop zone below its exit level of the drain to constitute a siphoning cane.
  • the drain advantageously comprises a U-shaped pumping tube outside the chamber with a small branch connected to the lower partition opposite the valve and a large branch oriented so that the opening of its free end is located at least at the level above said chamber.
  • the pumping tube comprises preferably length variation means and sound flotation means free end at the surface of the liquid present in the drain, the means for varying length and flotation being arranged to cooperate so as to maintain the orifice above the surface of the liquid in the drain.
  • this pumping tube can be constituted at least two tube portions arranged to fit at least partially one inside the other in a nesting zone and that at least one of the portions of tube is movable in translation relative to the other, these tube portions and their area socket forming said length variation means.
  • These tube portions preferably include sealing means arranged to seal the nesting area and the free end has at least a filter covering the orifice, the filter being arranged to allow only the entry of liquid in the pumping tube through this orifice.
  • the drain advantageously comprises at at least two superimposed rooms, the rooms being separated by at least one intermediate partition arranged to allow the passage of the liquid present in the drain in at least the upper room, the upper partition of each room comprising at least two passages for receiving at least one level detector and a compressed air inlet pipe, and the lower partition of each comprising at minus a passage to receive a liquid discharge pipe.
  • the device can include a series of drains as defined above, each drain having its own solenoid valve control and its own solenoid valve, the assembly solenoid valves being supplied by a single reserve of compressed air supplied by a compressor.
  • the drainage device 20, 20a, 20b comprises a drain 1, 1a, 1b positioned in a wellbore.
  • This drain 1, 1a, 1b could of course be launched, that is to say pushed in by injection of liquid or put in place by any other known method.
  • the drain 1, 1a, 1b is placed vertically but can also be tilted.
  • a protective pipe 15 in which opens the drain 1, 1a, 1b is dug substantially perpendicular to this drain 1, 1a, 1b. It includes manholes 2 allowing access to the drain 1, la, 1b. It is of course possible to provide that the drain 1, 1a, 1b opens directly at ground level, its upper end being held by a collar for example.
  • the drain 1, 1a, 1b comprises on the side of its lower end at least one chamber 3, 3a, 3b, 3c constituting a closed volume.
  • This chamber 3, 3a, 3b, 3c is closed in its lower part by a lower partition 17, 17a, 17b, 17c comprising at least a valve 4, 4a, 4b, 4c and in its upper part by an upper partition 16, 16a, 16b, 16c.
  • Chamber 3, 3a, 3b, 3c is positioned deep inside the drain 1, 1a, 1b so that its lower partition 17, 17a, 17b, 17c is close to the lower end of the drain 1, 1a, 1b in contact with the liquid to be pumped and that the upper partition 16, 16a, 16b, 16c is itself arranged in depth and sufficiently far from the ground depending on the depth of the borehole.
  • the valve 4, 4a, 4b, 4c is arranged to open and allow entry into the chamber 3, 3a, 3b, 3c the liquid to be pumped when the chamber 3, 3a, 3b, 3c is in depression by outside and close when the chamber 3, 3a, 3b, 3c is overpressure. Any other system providing the same functions can of course be used.
  • the chamber 3 is integrated into the drain 1.
  • the wall of the drain 1 on the height of the chamber 3 is full and not screened to constitute a closed volume.
  • bedroom 3 can be dissociated from the drain and carried by a support, the drain then being able to present a strainer part.
  • the upper partition 16 of the chamber 3 has three passages for receiving a level detector 5 of the liquid to be evacuated, a compressed air inlet pipe 6 of which the lower end ends in the upper zone of chamber 3 and a pipe evacuation 7 of the liquid discharged from the chamber 3, the lower end of which ends in the lower zone of chamber 3.
  • the level detector 5 of the liquid to be evacuated consists of an electric cable comprising three conducting wires, each wire being stopped at different depths and the end of which is stripped and terminated by a contact. So a wire is stopped at near the lower part of the chamber 3, below the exhaust pipe 7 defining a first contact A. Another wire is stopped at a level slightly higher (about 10 cm) at the end of the exhaust pipe 7 defining a contact B and the last wire is stopped in the upper part of the chamber 3 defining a third contact C.
  • the contacts A, B, C are intended to detect the level of liquid in the chamber 3 respectively slightly above the inlet of the exhaust pipe 7 liquid and at the compressed air inlet pipe 6.
  • contacts electrical contacts A and B must be immersed in the liquid contained in the chamber 3 to trigger the evacuation of the liquid and the contacts A and C must be immersed in the liquid to trigger the stop of this evacuation.
  • the level detector 5 is connected to a powered solenoid valve control 9 electrically and activating a three-way solenoid valve 10.
  • the air inlet pipe 6 compressed passes through protective line 15 and its other end is connected to the three-way solenoid valve 10, itself connected, by means of a valve 11 to a reserve 12 of compressed air supplied by a compressor 13.
  • Reserve 12 is regulated between a minimum pressure and a maximum pressure.
  • the solenoid valve 10 is arranged to inject compressed air into the chamber 3 through the compressed air inlet pipe 6 when the liquid level in said chamber 3 reaches contact C near the end of the compressed air inlet pipe 6, to stop the injection of compressed air when the liquid level drops below of the second contact B and to return the chamber 3 to atmospheric pressure.
  • the discharge pipe 7 comprises at least one non-return valve 8 chosen for support the weight of the column of evacuated liquid.
  • the drain hose 7 passes in the protective pipe 15 and goes towards an outlet 14 located at a level and at an indifferent distance. I1 can however be interesting to use the pipe outlet 7 as a siphon pipe if the difference in level of the outlet 14 allows it. For that, it will be led in a zone in uneven lower compared to the point top of the siphon. Its end can then be treated either by raising it upwards, either by immersing it in a tank filled with liquid, the assembly then allowing to work according to a siphoning principle.
  • the device according to the invention constitutes an electropneumatic drain which operates from as follows: when the liquid column within the borehole reaches a certain height, the chamber 3 is then in depression relative to the pressure exerted by the liquid. As a result, the valve 4 opens, the drilling liquid can then enter chamber 3 by the hydrostatic pressure of the column only liquid. At the same time, the chamber 3 is brought to atmospheric pressure by through the pipe 6 and the solenoid valve 10, the path to which is open. This device thus makes it possible not to keep the chamber 3 under pressure or in depression.
  • the regulatory system is therefore simplified, more economical and more reliable, even with liquids contaminated with impurities.
  • the passage of the liquid in front of the contact B opens the circuit of the solenoid valve 10. When the chamber 3 is full of liquid, contact C opens solenoid valve 10 so as to inject compressed air through the pipe 6. The chamber 3 is then overpressure relative to the outside and the valve 4 closes.
  • Compressed air pumps the liquid out of chamber 3 through the hose evacuation 7 leading to the emptying of said chamber 3, until the liquid returns to contact B, causing the solenoid valve 10 to close and the return of chamber 3 to atmospheric pressure.
  • drain pipe 7 is used as a siphon pipe, said pipe evacuation 7 is then initiated, the volume evacuated from the chamber 3 being calibrated for be greater than the volume necessary for the discharge pipe 7 to prime. The the siphon then flows until it can be defused.
  • the operation can thus be repeated periodically a large number of times to end up draining the borehole.
  • the chamber 3a is dissociated from the drain la and is carried by a support (not shown).
  • the drain then has a screened part over all or part of its height.
  • the upper partition 16a of the chamber 3a has three passages for receiving a level detector 5a of the liquid to be evacuated, a compressed air inlet pipe 6a and a discharge pipe 7a for the discharged liquid out of room 3a.
  • the level detector 5a of the liquid to be evacuated is similar to that described previously and defines the contacts Aa, Ba and Ca intended to detect the level of liquid in chamber 3a respectively slightly above the inlet of the pipe liquid discharge 7a and at the compressed air inlet pipe 6a.
  • This drain 1a further comprises a pumping tube 19 in the shape of a U outside the chamber 3a and provided with a short branch 23 connected to the lower partition 17a in look of the valve 4a and of a long branch 24 substantially vertical and oriented so that the opening 21 of its free end 22 is located substantially at the most top of bedroom 3a.
  • This pumping tube 19 includes length variation means 25 allowing to vary for example the length of the long branch 24 and more particularly the height of its orifice 21.
  • the pumping tube 19 is for example consisting of two portions of tubes 26, 27, a first portion of tube 26 connected to the lower partition 17a and forming the short branch 23 and the bottom of the long branch 24 and a second portion of tube 27 arranged in the extension of the first portion of tube 26 forming the top of the long branch 24.
  • These tube portions 26, 27 have dimensions allowing them to fit one into the other by sliding in a nesting zone 28 variable so that the second portion of tube 27 is movable in substantially vertical translation by compared to the first tube portion 26.
  • the first and second tube portions 26, 27 thus form the length variation means 25 of the pumping tube 19.
  • the fitting zone 28 may include sealing means 29, for example sliding seals or any other equivalent means, preventing any liquid or body solid to enter the pumping tube 19 through this socket area 28 and particularly during the relative movements of the second portion of tube 27 relative to at the first 26.
  • the free end 22 of the pumping tube 19 includes flotation means 30, for example a float, allowing it to float on the surface of the water table, the pumping tube 19 lengthening or shortening depending on the height of the means buoyancy 30.
  • the length variation means 25 and the buoyancy means 30 thus cooperate so that the orifice 21 is permanently located above the level of the water table. In this way, hydrocarbons, or any other substance lighter than water and forming a layer on the surface of the water table, can freely penetrate through the orifice 21 into the pumping tube 19.
  • the free end 22 of the pumping tube 19 may include a filter (not shown) covering orifice 21 and preventing the entry of any type of agglomerates into the tube pumping 19.
  • This filter can for example have a semi-spherical shape, the part of which curved is oriented upwards and perforated with holes whose dimension is adjusted to allow the passage of oil and prevent the passage of dirt or agglomerates that can disrupt the proper functioning of the drainage system 20a.
  • This drain 1a is similar to the previous one.
  • Room 3a is set to atmospheric pressure.
  • the pressure of the hydrocarbon column forming in the pumping tube 19 opens the valve 4a letting the hydrocarbons enter the room 3a by simple gravity.
  • the passage of hydrocarbons before the contact Ba opens the solenoid valve circuit (not shown in this figure).
  • contact Ca opens the solenoid valve of such so as to inject compressed air through the pipe 6a. Chamber 3a is then in overpressure with respect to the pumping tube 19 and the valve 4a closes.
  • Compressed air pushes hydrocarbons out of chamber 3a through the hose evacuation 7a leading to the emptying of said chamber 3a, until these hydrocarbons pass in front of the contact Ba, thus inducing the closure of the solenoid valve and the return of the chamber 3a to atmospheric pressure.
  • the drain 1a described in this alternative embodiment generally makes it possible to pump all liquids lighter than water.
  • the drain 1b has several superimposed rooms and for example two: one room upper 3c superimposed on a lower chamber 3b. Rooms 3b and 3c can be or not dissociated from the drain 1b. In the case shown, the lower chambers 3b and higher 3c are dissociated from the drain 1b and are carried by a support (not shown), the drain 1b having a screened part over all or part of its height.
  • the wall of the drain 1b is full and not screened over the height of each chamber 3b, 3c and comprises an intermediate zone (not shown) strainer located between rooms 3b and 3c as well as an additional area (not shown) strainer under the lower chamber 3b to let the liquid pass through said bedrooms 3b and 3c.
  • the lower 3b and upper 3c chambers are separated by a partition intermediate 18 disposed between the upper partition 16b of the lower chamber 3b and the lower partition 17c of the upper chamber 3c.
  • This intermediate partition 18 has orifices allowing the passage of the liquid present in the drain 1b or in the ground, towards the inside of the upper chamber 3c via the valve 4c.
  • An additional partition 18 'also comprising orifices allowing passage the liquid can also be placed under the lower chamber 3b.
  • the orifices of intermediate 18 and complementary 18 'partitions are provided to serve as a filter and do not let only the liquid and fine particles. The agglomerates for example of earth cannot enter the lower 3b and upper 3c chambers and can thus disturb the operation of the drainage device 1b.
  • the upper partitions 16b, 16c of the chambers 3b and 3c each have two passages to receive at least one level detector 5b, 5c and a pipe 6b, 6c compressed air inlet.
  • the lower partitions 17b, 17c each have at at least one valve 4b, 4c and a passage for receiving a discharge pipe 7b, 7c from liquid from chambers 3b and 3c.
  • the passages made in the lower partitions 17b, 17c and higher 16b, 16c open laterally so as not to hinder the superposition of rooms 3b and 3c.
  • Level detectors 5b, 5c of the liquid to be evacuated are similar to that of drains 1, la and respectively define the contacts Ab, Bb, Cb and Ac, Bc, Cc intended for detect the liquid level in the lower 3b and upper 3c chambers respectively slightly above the inlet of the discharge pipes 7b, 7c of the liquid and at the level of pipes 6b, 6c of compressed air inlet.
  • each of the chambers 3b and 3c is identical to that of the bedrooms 3, 3a.
  • This variant allows advantageously to combine several rooms 3a, 3b in order to obtain a maximum flow of the drain 1b proportional to the number of rooms while not soliciting each of the rooms individually only when each of them must be emptied.
  • the number of these rooms can of course be greater than two.
  • the electropneumatic drainage device 20, 20a, 20b according to the invention makes it possible to pump liquids at great depth, by acting on the pressure of the compressed air, almost zero flow rates up to flow rates, for example multiples of 1.5 m 3 / h depending on the number of superimposed chambers, while only requiring boreholes of small diameters, which is particularly advantageous for boreholes of great depth.
  • the injection of compressed air is done only when the or chambers 3, 3a, 3b, 3c are full and must be emptied to evacuate the liquid present in the drain 1, 1a, 1b.
  • the drain 1, 1a, 1b on the height of the delivery, is empty, it can remain empty, without the need for compressed air. This allows a great saving of compressed air.
  • it is possible to optimize consumption compressed air by precisely determining the compressed air requirement just required depending on the volume of liquid to be evacuated.
  • the atmospheric pressure of the upper zone of the chamber 3, 3a, 3b, 3c after the liquid is discharged from the chamber allows a new reentry liquid in the chamber 3, 3a, 3b, 3c by the valve 4, 4a, 4b, 4c only by the weight of the liquid outside the drain 1, 1a, 1b. This avoids the use of air in depression, resulting in significant savings in terms of drilling equipment.
  • each drain having its own solenoid valve control and its own solenoid valve, the solenoid valve being supplied by a single reserve of compressed air supplied by a compressor.
EP01440281A 2000-08-23 2001-08-21 Einrichtung zur Tiefbodendrainage Expired - Lifetime EP1182355B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0010832A FR2813327B1 (fr) 2000-08-23 2000-08-23 Dispositif pour drainer un sol en profondeur
FR0010832 2000-08-23

Publications (2)

Publication Number Publication Date
EP1182355A1 true EP1182355A1 (de) 2002-02-27
EP1182355B1 EP1182355B1 (de) 2003-10-22

Family

ID=8853672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01440281A Expired - Lifetime EP1182355B1 (de) 2000-08-23 2001-08-21 Einrichtung zur Tiefbodendrainage

Country Status (4)

Country Link
EP (1) EP1182355B1 (de)
AT (1) ATE252689T1 (de)
DE (1) DE60101030T2 (de)
FR (1) FR2813327B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102828521A (zh) * 2012-08-16 2012-12-19 中交第二航务工程局有限公司 一种预制承台水下止水方法
EP3064649A1 (de) 2015-03-05 2016-09-07 Hydro Geotechnique Drainagevorrichtung fuer tiefe böden
CN107504262A (zh) * 2017-08-07 2017-12-22 上海公路桥梁（集团）有限公司 一种软土地层中越江顶管管道退管施工方法
CN114086581A (zh) * 2021-05-07 2022-02-25 上海洋源建设发展有限公司 一种井点降水装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105201000A (zh) * 2015-09-28 2015-12-30 中国十七冶集团有限公司 一种能远程监测的大面积基坑降水方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1242516B (de) * 1956-07-11 1967-06-15 Wilhelm Degen Dipl Ing Unterdruckbrunnen
US4717284A (en) * 1986-01-20 1988-01-05 Hydrogeo S.A. Device for draining soils in depth
FR2615014A1 (fr) * 1987-05-04 1988-11-10 Couaud Maurice Electronique et electromecanique appliquees aux chasses d'eau
US5301749A (en) * 1992-09-16 1994-04-12 Qed Environmental Systems, Inc. Dual pump floating layer recovery apparatus
WO1999064742A1 (en) * 1998-06-11 1999-12-16 Marvel John E Fluid well pump
US6048175A (en) * 1997-09-24 2000-04-11 Corlew; Edward A. Multi-well computerized control of fluid pumping

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5074758A (en) * 1988-11-25 1991-12-24 Mcintyre Glover C Slurry pump
FR2758162B1 (fr) * 1997-01-06 1999-04-16 Alain Duffau Pompe hydropneumatique immergee pour le pompage ou le relevement en niveau de liquides

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1242516B (de) * 1956-07-11 1967-06-15 Wilhelm Degen Dipl Ing Unterdruckbrunnen
US4717284A (en) * 1986-01-20 1988-01-05 Hydrogeo S.A. Device for draining soils in depth
FR2615014A1 (fr) * 1987-05-04 1988-11-10 Couaud Maurice Electronique et electromecanique appliquees aux chasses d'eau
US5301749A (en) * 1992-09-16 1994-04-12 Qed Environmental Systems, Inc. Dual pump floating layer recovery apparatus
US6048175A (en) * 1997-09-24 2000-04-11 Corlew; Edward A. Multi-well computerized control of fluid pumping
WO1999064742A1 (en) * 1998-06-11 1999-12-16 Marvel John E Fluid well pump

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102828521A (zh) * 2012-08-16 2012-12-19 中交第二航务工程局有限公司 一种预制承台水下止水方法
CN102828521B (zh) * 2012-08-16 2014-09-10 中交第二航务工程局有限公司 一种预制承台水下止水方法
EP3064649A1 (de) 2015-03-05 2016-09-07 Hydro Geotechnique Drainagevorrichtung fuer tiefe böden
FR3033341A1 (fr) * 2015-03-05 2016-09-09 Hydro Geotechnique Dispositif pour drainer un sol en profondeur
CN107504262A (zh) * 2017-08-07 2017-12-22 上海公路桥梁（集团）有限公司 一种软土地层中越江顶管管道退管施工方法
CN114086581A (zh) * 2021-05-07 2022-02-25 上海洋源建设发展有限公司 一种井点降水装置
CN114086581B (zh) * 2021-05-07 2023-06-06 上海洋源建设发展有限公司 一种井点降水装置的操作方法

Also Published As

Publication number Publication date
ATE252689T1 (de) 2003-11-15
EP1182355B1 (de) 2003-10-22
FR2813327B1 (fr) 2003-04-11
DE60101030T2 (de) 2004-07-08
FR2813327A1 (fr) 2002-03-01
DE60101030D1 (de) 2003-11-27

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