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EP0235353A2 - Protection de rupture pour parafouille - Google Patents

Protection de rupture pour parafouille Download PDF

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Publication number
EP0235353A2
EP0235353A2 EP86112600A EP86112600A EP0235353A2 EP 0235353 A2 EP0235353 A2 EP 0235353A2 EP 86112600 A EP86112600 A EP 86112600A EP 86112600 A EP86112600 A EP 86112600A EP 0235353 A2 EP0235353 A2 EP 0235353A2
Authority
EP
European Patent Office
Prior art keywords
diaphragm wall
wall according
sealing
protective layer
sealing membrane
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
EP86112600A
Other languages
German (de)
English (en)
Other versions
EP0235353A3 (en
EP0235353B1 (fr
Inventor
Aloys Schlütter
Klaus Kaewert
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.)
Niederberg-Chemie GmbH
Original Assignee
Niederberg-Chemie GmbH
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 Niederberg-Chemie GmbH filed Critical Niederberg-Chemie GmbH
Priority to AT86112600T priority Critical patent/ATE48863T1/de
Publication of EP0235353A2 publication Critical patent/EP0235353A2/fr
Publication of EP0235353A3 publication Critical patent/EP0235353A3/de
Application granted granted Critical
Publication of EP0235353B1 publication Critical patent/EP0235353B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material

Definitions

  • the invention relates to a diaphragm wall for sealing liquid-carrying and / or gas-carrying layers of earth, a slot being made in the soil and filled with sealing material, a plastic material being introduced into the earth slot as sealing material, a sealing membrane being lowered therein, and the plastic material preferably being added and / or mixture proportions of cement is solidified.
  • the other remedial concept involves encapsulating the soil.
  • An essential part of this encapsulation is a diaphragm wall that surrounds the contaminated area.
  • This diaphragm wall can be supplemented with a horizontal seal. With the horizontal seal underneath the contaminated soil and a cover provided at the top there is a complete encapsulation.
  • the horizontal seal below the contaminated area can be formed by natural, dense layers of soil. Clay layers are particularly suitable for this.
  • the horizontal seal can also be brought about by an artificial seal. Such seals can, for. B. bring under mining undercutting of the contaminated area.
  • a vertical seal can also be useful without a cover if contaminated water or the ingress of groundwater by pumping and / or pressing water are prevented.
  • the invention is based on the knowledge that an intervention in the water balance in the area of the earth slots leads to a change in the soil mechanics and, as a result, to more or less large settling movements. As soon as the soil on one side or the other of the diaphragm wall dries, corresponding voids are created in the layers of the earth, which previously had significant amounts of water, which easily lead to strong settling movements.
  • a diaphragm wall can be subjected to bending.
  • the diaphragm wall cannot adapt to this if the bentonite slurry has been solidified by adding cement. Without reinforcement with structural steel or the like, the solidified diaphragm wall must break.
  • the plastic material usually has an amazing elongation, e.g. B. 500 to 600%.
  • the high elongation of the plastic material will nevertheless not be sufficient in most cases, since the sealing membrane is clamped on both sides of the break point by the solidified bentonite and only a few millimeter wide strips of the sealing membrane have to bridge a slightly several centimeter wide break point.
  • the plastic waterproofing membrane is particularly sensitive when it is subjected to shear at the break point of the diaphragm wall.
  • the sealing sheet has an at least detachable protective layer and / or a sliding layer on at least one side and / or predetermined breaking points are provided in the diaphragm wall and / or joints in the diaphragm wall.
  • the protective layer offers a particularly advantageous solution.
  • the protective layer is formed by a fleece and / or a fabric and / or rubber shot mats.
  • fibers and / or threads made of polyester and / or polypropylene and / or polyethylene can be used.
  • the fleece the fibers or threads lie in disorder, while the fabric differs from them by the systematic arrangement of the threads. The systematic arrangement gives the fabric greater strength than the fleece.
  • Nonwovens are known in connection with plastic waterproofing membranes, but they are glass nonwovens. Glass fleece would not be suitable as a protective layer here, since the glass fibers would break at the breaking point of a diaphragm wall under the expected load. In that the nonwovens and fabrics according to the invention hold the diaphragm wall together at the breaking point, they have a function similar to that of a steel mesh as reinforcement in a concrete wall. i
  • the nonwovens and fabrics according to the invention are preferably detachably attached to the plastic sealing membrane. This facilitates the introduction of the fleece or fabric.
  • the nonwoven or fabric according to the invention is preferably laid together with the waterproofing membrane. A completely loose laying of the fleece or fabric in relation to the waterproofing membrane can also be considered. A connection between the fleece or fabric and the sealing membrane, however, simplifies assembly and reduces the effort required for this.
  • the fleece or fabric is attached to the sealing membrane, the fleece or fabric is forcibly carried along when the sealing membrane is gripped and assembled. No separate equipment has to be purchased for the existing equipment for the introduction of the waterproofing membrane.
  • the at least detachable connection between the waterproofing membrane and the protective layer - this also includes the loose laying of the protective layer relative to the waterproofing membrane - ensures that the material of the waterproofing membrane continues to flow to the breaking point if the diaphragm wall breaks. Then the high elasticity of the waterproofing membrane comes into play over a large part of the total length of the waterproofing membrane.
  • plastic webs have a low sliding resistance, while polyethylene, for example, has a friction factor that decreases with increasing pressure, ie. H. the clamping of the waterproofing membrane in the solidified bentonite only slightly counteracts the flow process according to the invention towards the breaking point.
  • a minimum strength is provided for the protective layer.
  • the strength of the protective layer formed by fleece or fabric is determined by its weight. Sufficient strength is already given at 500 g / m 2 . The upper limit of the necessary strength is likely to be for nonwovens or fabrics with 2,000 g / m 2 .
  • the releasable connection between the protective layer and the sealing sheet according to the invention is preferably brought about by gluing. Adhesive dots are sufficient. Their number is between 0.5 and 2.5 / m 2 with a diameter of 5 to 25 mm.
  • An alternative to the protective layer according to the invention is formed by a lubricant laminated onto the sealing membrane.
  • the lubricant only promotes the flow of material of the waterproofing membrane, but does not have the reinforcement-like function of the protective layer according to the invention.
  • a further alternative is given according to the invention with predetermined breaking points in the diaphragm wall, at which the sealing membrane is provided with a thickening.
  • the predetermined breaking point arises from the formation of a weak point on the diaphragm wall. In the event of a break at this weak point, significantly more material is then available for an expansion of the waterproofing membrane than at other points, i. H.
  • a joint with a multiple of the width of other joints can form at breaking points before the waterproofing membrane breaks.
  • the thickening is formed by a hollow profile. With sufficiently large dimensions of the thickening or the hollow profile, a predetermined breaking point inevitably arises at these points in the diaphragm wall without additional Measures, since the material thickness of the diaphragm wall has been reduced considerably.
  • the hollow profile provides additional security against shearing off of the waterproofing membrane, in that the breaking edges which possibly cause the shearing action are at a distance corresponding to the external dimension of the hollow profile, i.e. H. Before a shear effect occurs, the broken diaphragm wall must have shifted by this amount at the breaking point transversely to the diaphragm wall plane.
  • the thickening or the hollow profile is put together with the connection point between two sealing sheets if the diaphragm wall is manufactured in sections.
  • one-piece or welded joint profiles can also be used with the membrane.
  • Fig. 1 shows a horizontal section through a diaphragm wall according to the invention.
  • the diaphragm wall is in soil 1 and has a depth of 30 m.
  • the diaphragm wall is formed by bentonite 2 and a sealing membrane 3, which is provided on both sides with a protective layer 4.
  • the sealing membrane 3 consists of a high-pressure polyethylene or an ethylene copolymer.
  • the fabric fibers of the fabric protective layers 4 made of polyethylene or polyamide 2 enclose the sealing sheet with the two protective layers 4 and are solidified as a result of a cement admixture.
  • Adhesive points 5 are provided between the fabric protection layers 4 and the sealing membrane 3.
  • the number of glue points is 1 / m 2 .
  • the diameter is 10 mm.
  • the glue was created by hot gluing.
  • the fabric protection layers have a basis weight of 1,000 g / m 2 , the waterproofing membrane has a thickness of 3 m ⁇ .
  • the sealing sheet 6 is provided at intervals with a hollow profile 7. Due to its large dimensions, the diaphragm wall solidified by cement is reduced in its material thickness in such a way that setting movements which load the diaphragm wall transversely to the diaphragm wall plane lead to a break in the region of the hollow profile 7. The hollow profile deforms in the resulting fracture gap without tearing. This keeps the seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Slot Machines And Peripheral Devices (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Insulating Bodies (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Processing Of Solid Wastes (AREA)
EP86112600A 1986-03-07 1986-09-11 Protection de rupture pour parafouille Expired EP0235353B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86112600T ATE48863T1 (de) 1986-03-07 1986-09-11 Bruchsicherung an einer schlitzwand.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863607525 DE3607525A1 (de) 1986-03-07 1986-03-07 Bruchsicherung an einer schlitzwand
DE3607525 1986-03-07

Publications (3)

Publication Number Publication Date
EP0235353A2 true EP0235353A2 (fr) 1987-09-09
EP0235353A3 EP0235353A3 (en) 1987-10-14
EP0235353B1 EP0235353B1 (fr) 1989-12-20

Family

ID=6295751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86112600A Expired EP0235353B1 (fr) 1986-03-07 1986-09-11 Protection de rupture pour parafouille

Country Status (3)

Country Link
EP (1) EP0235353B1 (fr)
AT (1) ATE48863T1 (fr)
DE (2) DE3607525A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4863638A (en) * 1988-04-01 1989-09-05 Harper Iii Raymond F Process for hazardous waste containment
US5180251A (en) * 1990-06-12 1993-01-19 Paurat F Underground protection underneath a dump
US5199816A (en) * 1990-06-12 1993-04-06 Paurat F System for isolating a dump

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8900103U1 (de) * 1989-01-05 1989-02-23 Geotex Ingenieurberatungsgesellschaft, 8011 Putzbrunn Dehnungssicherung
DE4011157A1 (de) * 1990-04-06 1991-10-17 Beck Wolfgang Verlegeform von kunststoffdichtungsbahnen
DE4304425A1 (de) * 1993-02-13 1994-08-18 Dernbach Heinrich Gmbh Verfahren und Vorrichtung zur Herstellung einer abdichtenden Masse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB727936A (en) * 1953-03-06 1955-04-13 Leroy Francis Harza Improvements in a sealing strip for a joint between structures
DE1239993B (de) * 1961-12-22 1967-05-03 Polensky & Zoellner Rohrfoermige Kopfschalung zum Begrenzen eines Arbeitsabschnittes einer im Erdboden herzustellenden Betonwand
FR2257010B1 (fr) * 1974-01-09 1977-07-01 Ruhrkohle Ag
DE3430789A1 (de) * 1984-08-22 1986-03-06 Ed. Züblin AG, 7000 Stuttgart Verfahren zum einbringen und verbinden von membranen in schlitzwaenden und vorrichtung zur durchfuehrung des verfahrens
DE3432642A1 (de) * 1984-09-05 1986-03-13 Schlegel Lining Technology GmbH, 2000 Hamburg Folienmaterial zum kontrollierbar dichten trennen der auf seinen beiden seiten befindlichen bereiche

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4863638A (en) * 1988-04-01 1989-09-05 Harper Iii Raymond F Process for hazardous waste containment
US5180251A (en) * 1990-06-12 1993-01-19 Paurat F Underground protection underneath a dump
US5199816A (en) * 1990-06-12 1993-04-06 Paurat F System for isolating a dump

Also Published As

Publication number Publication date
EP0235353A3 (en) 1987-10-14
DE3607525A1 (de) 1987-09-10
ATE48863T1 (de) 1990-01-15
DE3667681D1 (de) 1990-01-25
EP0235353B1 (fr) 1989-12-20

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