EP0329500B1 - Verfahren und Einrichtung zur Bodenkonsolidierung - Google Patents
Verfahren und Einrichtung zur Bodenkonsolidierung Download PDFInfo
- Publication number
- EP0329500B1 EP0329500B1 EP89400217A EP89400217A EP0329500B1 EP 0329500 B1 EP0329500 B1 EP 0329500B1 EP 89400217 A EP89400217 A EP 89400217A EP 89400217 A EP89400217 A EP 89400217A EP 0329500 B1 EP0329500 B1 EP 0329500B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- drains
- layer
- draw
- tubes
- 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.)
- Expired - Lifetime
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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 the consolidation of soft soils with low permeability, impregnated with water.
- the layer of soil to be treated for example a layer 1 of soft clay about twenty meters thick resting on a layer 2 of subsoil overlying, a layer 3 of embankment, for example pebbles or earth, thus loading the site to be built.
- the backfill brings to the ground a pressure constraint generally higher than that of the planned construction.
- the presence of the embankment causes a compaction of layer 1, forcing the water contained in this layer to escape along a general path indicated by arrows 4.
- drains 5 shown vertical in FIG. 2.
- These drains can be formed for example by drilling small diameters filled with sand, in a fairly tight mesh, for example from 2 to 8 meters.
- the layer 1 is loaded by the embankment 3, as before.
- drains formed from porous plastic tubes with an internal diameter of the order of 50 mm.
- sand As a permeable material, sand is usually provided, which is deposited on the ground in a layer of about 20 to 60 cm thick, and in this mass of sand, a vacuum of around 60 is established. at 80 kPa. As can be understood, the load applied on the ground depends on the surface thus covered.
- a channel 11 which is hollowed out at the periphery of the zone to be treated and then filled with a fluid material, such as a bentonite mud, in which one comes to drown the outer edges 9a of the membrane.
- drains which have been again identified 5, these will be of the same type as those previously described. They always open at the top at the level of layer 8 of permeable material.
- Patent FR-A-995 251 discloses a method of consolidating by soil compaction an area of soft ground with low permeability, impregnated with water, of the type in which a partial air vacuum is established in a layer. surface of permeable material disposed substantially over the entire surface of the area of land to be consolidated and surmounted by an impermeable waterproofing membrane, there is produced in said terrain a mesh network of hollow drains with permeable walls sinking into the ground and s 'stopping before entering a sub-layer of permeable ground and said drains are unblocked at said surface layer of permeable material.
- Also known from patent FR-A-1 475 244 is a system for vertically draining a soil.
- a filter tube is inserted into a peat soil where it is surrounded by a filtering mass.
- the peat is surmounted by a layer of clay intended to prevent the penetration of atmospheric air into the filter tube.
- the clay layer is joined to the outer wall of the tube for example by clay soaked in water.
- the problem which the present invention proposes to solve is to improve the evacuation efficiency of the water having penetrated into the drains without disturbing the operating principle of the depressurization of the surface layer of permeable material, this in efficiency conditions suitable for industrial use.
- each drain is fitted with a tube connected to a means, such as a pump, of evacuation of water to the outside, said tubes descending into the drains over the greater part of the height of the latter with which they communicate in the lower part, and said evacuation means are controlled so as to cause the evacuation of water out of these drains, in the presence of water, and to prevent a drop in pressure, via the tubes, from inside the drains, when there is a lack of water.
- a means such as a pump
- the period during which the maintenance of the partial vacuum maintenance of the layer of permeable material and where the evacuation of the water will be controlled will be approximately half an hour, with a periodicity of once or twice a day.
- a characteristic of the invention provides that in addition to the pressure constraint exerted on the area of ground to be consolidated by the partial vacuum of the layer of permeable material. , one comes to exert on the zone in question an additional pressure by placing on it, on the surface, a distributed load, such as a load of water or fill material.
- the invention also relates to a device for implementing this process, the characteristics of this device appearing clearly in the appended claim 7.
- sensors of all known types will also be arranged towards the bottom of at least some of the drains, at the lower end of the tubes, and connected to the pump control means, in order to stop the latter. once the drains are emptied of their water.
- drains 13 constituted for example by porous plastic sheaths, strainer tubes, that is to say perforated, or others.
- These drains 13 form wells having a diameter of the order of 50 mm and stop at a certain distance above the draining layer 12 which they must not reach.
- the network mesh can respect a distance between drains for example from 4 to 6 meters. In practical, the denser the mesh, the faster the consolidation can be.
- the drains 13 open into a surface layer 14 of relatively thin permeable material, such as a mass of sand about 30 to 50 cm thick, which has been extended substantially over the entire surface of the zone of land to consolidate.
- the layer 14 is covered with a tarpaulin or membrane 15 made of a substantially airtight synthetic material, at least in air, the peripheral outer edges 15a of which are immersed in a channel 16 filled with a material sufficiently viscous to hold the edges in position of the membrane and ensure its tightness.
- a tarpaulin or membrane 15 made of a substantially airtight synthetic material, at least in air, the peripheral outer edges 15a of which are immersed in a channel 16 filled with a material sufficiently viscous to hold the edges in position of the membrane and ensure its tightness.
- a conduit 17 connected to a means of evacuating water such as a "vacuum” suction pump 18 of the liquid ring type, so that it is possible to establish under the membrane.
- a partial air vacuum of the order of 60 to 80 kPa.
- the conduit 17 will come out of the membrane without adversely affecting the seal.
- each drain 13 inside each drain 13, a tube 19 of smaller diameter will be lowered, such as a plastic tube of the polyamide type of approximately 4 to 8 mm in diameter.
- these tubes are in communication with the drains and, in practice, will descend in the latter to approximately 1 to 2 meters from the bottom, so as to terminate at a level higher than the deposit layer 20 of various materials. which generally forms at the bottom of drains.
- Each tube 19 is essentially connected to the surface to a common flexible conduit 21, itself connected to an external means for discharging water, which, in the example illustrated, is the vacuum pump 18 which serves to maintain the partial vacuum in layer 14 of permeable material.
- switching means shown diagrammatically 28, are provided, controlled by a control unit, marked 38, allowing the pump to suck through either the conduit 17 or the conduit 21.
- This lower part is bent upwards in the shape of a hook and ends in a cage 22 open on the drain, in which cage the tube opens out through an orifice 23.
- a float 24 mounted movable in the cage and equipped with a valve or a ball 25 capable of closing the orifice 23.
- the switching means 28 is controlled so that the pump 18 ensures the depression of the layer 14.
- a pressure of about 60 to 80 kPa therefore prevails in this layer and in the non-submerged part of the drains 13.
- the conduit 21 is substantially at atmospheric pressure.
- a level sensor 30 such as a contactor connected to an electrical supply means (not shown) and which may have been fixed to the tube 19.
- This sensor 30 which is also connected (not shown) to the pump control unit 38 triggers the switching of this pump, the connection of which "switches" from line 17 to line 21.
- Maintaining the partial vacuum of layer 14 is therefore temporarily interrupted. A pressure lower than that prevailing in the layer 14 and at the top of the drains 13 is then established in the tubes 19 in order to stabilize in general around 60 to 80 kPa.
- the water contained in the drains is then sucked through the openings of the cage 22, passes through the orifice 23 and rises in the tubes to be evacuated on the surface, outside the membrane 15.
- another level sensor 31 such as an electrical sensor connected to its supply means (not shown) as well as to the unit 38 pump 18, so that as soon as this sensor 31 is no longer immersed in water, the pump again "switches” from line 21 to line 17 and thus restores the partial vacuum in the layer 14.
- FIG. 6 first of all, provision has been made to deposit directly on the layer 1 of ground, a layer of backfill 32 which has been covered with the layer 14 of permeable material surmounted by its membrane 15 whose outer edges 15a plunge into the peripheral sealing channel 16.
- the drains 13 pass through the layer 1 to be treated, but also through the backfill layer 32 to open out under the layer 14 in which, as before, partial vacuum has been established.
- FIG. 8 illustrates a third possibility of additional loading.
- the bottom of the bowl and the merlon 33 were covered with the layer 14 of permeable material which was itself covered with its sealing membrane 15.
- the bowl 34 thus formed was filled with a liquid 35, such as water, so as to ensure an additional loading of the ground, in the manner of the embankment of FIGS. 6 and 7.
- a waterproof membrane will be chosen.
- FIGS. 6 to 8 are also provided with means for discharging water from the drains.
- each drain could be equipped, towards its base, with a discharge pump which can be controlled from the surface continuously or intermittently, cyclically, by means of a compressed air duct connected to a compressor for evacuating on the surface, by an annex discharge pipe, the water collected at the bottom of the drains (not shown).
- Such a device is well known, in particular from patent FR-A-2 564 500 to which reference may be made, and in which is described a pump essentially comprising a cylindrical body of diameter generally equivalent to that of the drains, an inlet valve. of water mounted on the body in question and allowing the entry of overpressure water into the body, a flexible compressed air supply duct connected to said body and to a ground compression station, and a chamber accumulation of water formed in said body, which chamber is connected through a non-return valve to another flexible conduit for discharging the water back up, through the drain, to the surface.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Paper (AREA)
Claims (11)
dadurch gekennzeichnet, daß sie ferner aufweist:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89400217T ATE75273T1 (de) | 1988-02-15 | 1989-01-26 | Verfahren und einrichtung zur bodenkonsolidierung. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8801757 | 1988-02-15 | ||
FR8801757A FR2627202B1 (fr) | 1988-02-15 | 1988-02-15 | Procede et dispositif de consolidation de terrains |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0329500A1 EP0329500A1 (de) | 1989-08-23 |
EP0329500B1 true EP0329500B1 (de) | 1992-04-22 |
Family
ID=9363260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89400217A Expired - Lifetime EP0329500B1 (de) | 1988-02-15 | 1989-01-26 | Verfahren und Einrichtung zur Bodenkonsolidierung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0329500B1 (de) |
AT (1) | ATE75273T1 (de) |
DE (1) | DE68901277D1 (de) |
FR (1) | FR2627202B1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103711117A (zh) * | 2014-01-17 | 2014-04-09 | 邓立新 | 真空预压自动化智能监测系统 |
CN106869107A (zh) * | 2017-02-28 | 2017-06-20 | 河北工业大学 | 一种加固软土地基的新型立体排水系统及其降水施工方法 |
DE102014214718B4 (de) | 2013-07-26 | 2022-02-17 | Soletanche Freyssinet | System und Verfahren zum Trockenlegen feuchter Böden |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2663373B1 (fr) * | 1990-06-18 | 1993-05-28 | Cognon Jean Marie | Procede et dispositif pour etablir une depression dans une zone de terrain permeable isolee de l'atmosphere par une membrane etanche. |
BE1004706A4 (nl) * | 1991-03-22 | 1993-01-12 | Oosterhof Holman Milieutechnie | Werkwijze en inrichting voor het reinigen van een verontreinigd bodemgebied. |
BE1006637A3 (nl) * | 1993-01-25 | 1994-11-03 | Verstraeten Funderingstech Bv | Werkwijze voor het versneld konsolideren van een terrein. |
FR2756303B1 (fr) * | 1996-11-25 | 1998-12-31 | Robinet Jean Claude | Dispositif d'echange et de consolidation hydrique des sols |
BE1011446A3 (nl) * | 1997-06-10 | 1999-09-07 | Applic Of Cleaning Tech On Soi | Inrichting voor het onttrekken van vloeistof, o.m. voor het verlagen van het grondwaterniveau of voor drijflaagverwijdering. |
NL1009792C1 (nl) * | 1998-03-17 | 1999-09-20 | Hollandsche Betongroep Nv | Werkwijze voor het consolideren van een voor vloeistof slecht doorlatende waterhoudende grondlaag, bijvoorbeeld een klei- of veenhoudende laag. |
NL1008617C2 (nl) * | 1998-03-17 | 1999-09-20 | Hollandsche Betongroep Nv | Werkwijze voor het consolideren van een waterhoudende grondlaag, zoals een klei- of veenhoudende laag. |
GB2338006A (en) * | 1998-06-02 | 1999-12-08 | Isis Innovation | Consolidation of sedimentary beds |
US6254308B1 (en) * | 1999-02-25 | 2001-07-03 | Menard Soltraitement | Equipment and a method for partially drying a zone of ground containing a liquid |
KR20020068988A (ko) * | 2002-07-12 | 2002-08-28 | 김윤상 | 바닷물을 재하 하중으로 이용한 대규모 부지의 연약지반개량공법 |
US7198430B2 (en) * | 2002-10-31 | 2007-04-03 | Maruyama Kougyo Kabushikikaisha | Reformation of soft soil and system therefor |
NL1023555C2 (nl) * | 2003-05-28 | 2004-12-03 | Bos & Kalis Baggermaatsch | Werkwijze en samenstel voor het onttrekken of toevoeren van stoffen uit/aan een bodemlichaam. |
CN100549304C (zh) * | 2007-08-01 | 2009-10-14 | 汤连生 | 一种无密封快速真空预压法 |
CN101949153B (zh) * | 2010-09-14 | 2012-07-04 | 刘远锋 | 地基排水控制法 |
CN103321276B (zh) * | 2012-03-22 | 2015-12-16 | 甘肃第一建设集团有限责任公司 | 节能供水无负压管路 |
CN102787613B (zh) * | 2012-08-30 | 2015-06-10 | 中国水利水电第十四工程局有限公司 | 一种地下洞室排水盲沟装置 |
NL2010349C2 (en) * | 2013-02-22 | 2014-08-25 | Oord Dredging And Marine Contractors B V Van | Method for consolidating water-containing ground, and drain element for use in such method. |
CN104652409B (zh) * | 2014-12-24 | 2016-08-24 | 中交天津港湾工程研究院有限公司 | 一种连续强排水联合夯密软基处理技术方法 |
CN105804044B (zh) * | 2016-03-21 | 2017-12-19 | 温州大学 | 辐射式正负压联合真空预压地基处理系统以及进行真空预压地基处理的方法 |
CN110593288A (zh) * | 2019-09-06 | 2019-12-20 | 河北中基华工程项目管理有限公司 | 一种用于深基坑的井点降水与排水装置 |
CN110984117B (zh) * | 2019-11-25 | 2021-03-26 | 浙江大学 | 一种用于软土地基处理的装置及方法 |
CN113175004B (zh) * | 2021-04-25 | 2022-06-07 | 中国长江三峡集团有限公司 | 海上风电单桩基础防冲刷装置及方法 |
CN113186961A (zh) * | 2021-04-29 | 2021-07-30 | 中国一冶集团有限公司 | 一种减小对周边建筑物影响的基坑降排水方法 |
CN113931656B (zh) * | 2021-09-16 | 2022-12-09 | 中国科学院武汉岩土力学研究所 | 一种隧道衬砌渗漏水病害真空注浆治理方法及系统 |
CN114606927B (zh) * | 2022-01-24 | 2024-05-03 | 中交第二航务工程局有限公司 | 真空降水联合气压劈裂进行地基处理的施工方法 |
CN115434301A (zh) * | 2022-08-03 | 2022-12-06 | 上海渊丰地下工程技术有限公司 | 一种真空预压排水系统及地基处理方法 |
CN117090219B (zh) * | 2023-09-01 | 2024-07-30 | 山东正元建设工程有限责任公司 | 钢筋混凝土基坑支护支撑系统 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2202223A (en) * | 1938-10-08 | 1940-05-28 | Thomas F Moore | Water mop |
FR995251A (fr) * | 1949-09-13 | 1951-11-29 | Procédé pour la compression et/ou la stabilisation de terrains | |
FR1475244A (fr) * | 1966-04-07 | 1967-03-31 | Procédé pour drainer verticalement le sol et installation pour la mise en oeuvre de ce procédé | |
FR2564500B1 (fr) * | 1984-05-21 | 1987-06-12 | Intrafor Cofor | Procede de consolidation d'un sol mou a faible permeabilite et dispositif pour sa mise en oeuvre |
-
1988
- 1988-02-15 FR FR8801757A patent/FR2627202B1/fr not_active Expired - Lifetime
-
1989
- 1989-01-26 EP EP89400217A patent/EP0329500B1/de not_active Expired - Lifetime
- 1989-01-26 DE DE8989400217T patent/DE68901277D1/de not_active Expired - Lifetime
- 1989-01-26 AT AT89400217T patent/ATE75273T1/de not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014214718B4 (de) | 2013-07-26 | 2022-02-17 | Soletanche Freyssinet | System und Verfahren zum Trockenlegen feuchter Böden |
CN103711117A (zh) * | 2014-01-17 | 2014-04-09 | 邓立新 | 真空预压自动化智能监测系统 |
CN106869107A (zh) * | 2017-02-28 | 2017-06-20 | 河北工业大学 | 一种加固软土地基的新型立体排水系统及其降水施工方法 |
Also Published As
Publication number | Publication date |
---|---|
FR2627202B1 (fr) | 1992-04-17 |
EP0329500A1 (de) | 1989-08-23 |
FR2627202A1 (fr) | 1989-08-18 |
DE68901277D1 (de) | 1992-05-27 |
ATE75273T1 (de) | 1992-05-15 |
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