EP0235353B1 - Protection de rupture pour parafouille - Google Patents

Protection de rupture pour parafouille Download PDF

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Publication number
EP0235353B1
EP0235353B1 EP86112600A EP86112600A EP0235353B1 EP 0235353 B1 EP0235353 B1 EP 0235353B1 EP 86112600 A EP86112600 A EP 86112600A EP 86112600 A EP86112600 A EP 86112600A EP 0235353 B1 EP0235353 B1 EP 0235353B1
Authority
EP
European Patent Office
Prior art keywords
sealing
protective layer
sealing sheet
curtain wall
soil
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
Application number
EP86112600A
Other languages
German (de)
English (en)
Other versions
EP0235353A2 (fr
EP0235353A3 (en
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 method for producing a diaphragm wall for sealing liquid or gas-bearing layers of earth, the plastic sealing membrane being subjected to shear at a break point of the diaphragm wall, a slot being made in the soil and filled with sealing material, a plastic material being used as the sealing material inserted into the earth slot, the sealing membrane is lowered therein and the plastic material 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 e.g. Bring in under contaminated areas of the contaminated area. However, they can also be produced by drilling and / or pressing and / or pulling in sealing elements or sealing sheets.
  • 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 a significant amount 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 generally has an astonishing elongation, e.g. 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 if it is subjected to shear at the break point of the diaphragm wall.
  • the object of the invention is therefore to avoid damaging the sealing membrane in the case of shear stresses at the load point.
  • this is achieved in that a protective layer or a laminated sliding layer which at least dissolves in the event of shear stress or a laminated sliding layer is applied to the sealing sheet at least on one side or predetermined breaking points are generated in the diaphragm wall by thickening the sealing sheet.
  • Both the protective layer and the sliding layer prevent the sealing membrane from being clamped on both sides of the demolition point and from having to take account of the breaking movement solely by stretching in the very narrow breaking area. In spite of the advantageous elasticity of plastic sealing sheets, this would lead to an excessive load on the sealing sheets.
  • DE-A-34 30 789 describes a method for introducing and connecting membranes in diaphragm walls, in which multi-layer sealing systems are used.
  • the multi-layer systems have a different task. For example, for the disposal of leachate a filter fleece and a drainage layer are provided.
  • 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.
  • 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 fleece or fabric according to the invention is preferably installed 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. When 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 sealing membrane comes into play over a large part of the total length of the sealing membrane.
  • plastic webs have a low sliding resistance, polyethylene, for example, a friction factor that decreases with increasing pressure, i.e. 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 strengths is expected to be for nonwovens or fabrics with 2000 g / m2.
  • 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 sealing 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.e.
  • 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 there the material thickness of the diaphragm wall has been considerably reduced.
  • 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. 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.
  • 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 z.
  • the diameter is 10 mm.
  • the glue was created by hot gluing.
  • he fabric protection layers have a basis weight of 1000 g / M 2 , the waterproofing membrane a thickness of 3 mm.
  • the sealing membrane 6 is spaced at intervals with a thickening, e.g. provided 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.

Claims (8)

1. Procédé pour la construction d'une paroi rideau destinée à fermer de façon étanche des couches de terrain perméables aux liquides ou aux gaz, la feuille d'étanchéité en matière plastique étant soumise au cisaillement à un point de rupture de la paroi rideau, pour la construction de laquelle on ménage dans le terrain (1) une saignée que l'on remplit de matériau d'étanchéité (2) étant un matériau plastique, dans lequel on fait descendre la feuille d'étanchéité (3) et on fait durcir le matériau plastique, en appliquant sur au moins d'un côté de la feuille d'étanchéité (3) une couche de protection (4) au moins amovible en cas d'un effort au cisaillement ou une couche de glissement laminée sur la feuille avant la faire descendre ou dans la paroi rideau des points de rupture préférentielle ont été consitutés à intervalle par l'épaississement de la feuille d'étanchéité (3).
_2. Procédé conforme à la revendication 1, caractérisé en ce que l'on utilise comme couche de protection (4) une nappe non tissée et/ou un tissu et/ou des nappes de fragments de caoutchouc.
3. Procédé conforme à l'une des revendications 1 ou 2, caractérisée en ce que la couche de protection (4) est constituée de fibres et/ou filaments de polyester et/ou de polypropylène et/ou de polyéthylène et/ou de polyamide.
4. Procédé conforme à une ou à plusieurs des revendications 1 à 3, caractérisée en ce que la couche de protection (4) a un poids d'au moins 500 g/m2.
5. Procédé conforme à une ou à plusieurs des revendications 1 à 4, caractérisée en ce que la couche de protection (4) est collée à la feuille d'étanchéité.
6. Procédé conforme à la revendication 5, caractérisée par un collage de façon point par point.
7. Procédé conforme à la revendication 6, caractérisée en ce que les points de collage sont au nombre de 0,5 à 2,5/m2 et en ce que les points de collage (5) ont un diamètre compris entre 5 et 25 mm.
8. Procédé conforme à la revendications 1, caractérisée par l'utilisation d'un épaississement pareil à un profilé creux.
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 EP0235353A2 (fr) 1987-09-09
EP0235353A3 EP0235353A3 (en) 1987-10-14
EP0235353B1 true 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)

Families Citing this family (6)

* 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
DE8900103U1 (fr) * 1989-01-05 1989-02-23 Niederberg-Chemie Gmbh, 4133 Neukirchen-Vluyn, De
DE4011157A1 (de) * 1990-04-06 1991-10-17 Beck Wolfgang Verlegeform von kunststoffdichtungsbahnen
EP0461472A3 (en) * 1990-06-12 1992-04-08 Friedrich Wilhelm Paurat Construction for sealing a waste dump and method for making said construction
EP0461471A3 (en) * 1990-06-12 1992-04-08 Friedrich Wilhelm Paurat Method and apparatus for sealing a waste dump
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
GB1498691A (en) * 1974-01-09 1978-01-25 Ruhrkohle Ag Waterproof sealing means
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

Also Published As

Publication number Publication date
DE3607525A1 (de) 1987-09-10
ATE48863T1 (de) 1990-01-15
DE3667681D1 (de) 1990-01-25
EP0235353A2 (fr) 1987-09-09
EP0235353A3 (en) 1987-10-14

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