EP0414120B1 - Verfahren zum Herstellen einer Dichtwand sowie Vorrichtung zum Durchführen des Verfahrens - Google Patents

Verfahren zum Herstellen einer Dichtwand sowie Vorrichtung zum Durchführen des Verfahrens Download PDF

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Publication number
EP0414120B1
EP0414120B1 EP90115659A EP90115659A EP0414120B1 EP 0414120 B1 EP0414120 B1 EP 0414120B1 EP 90115659 A EP90115659 A EP 90115659A EP 90115659 A EP90115659 A EP 90115659A EP 0414120 B1 EP0414120 B1 EP 0414120B1
Authority
EP
European Patent Office
Prior art keywords
wall
channel
sealing
shuttering
sealing wall
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
Application number
EP90115659A
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German (de)
English (en)
French (fr)
Other versions
EP0414120A1 (de
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.)
Walter Bau AG
Original Assignee
Dyckerhoff and Widmann AG
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 Dyckerhoff and Widmann AG filed Critical Dyckerhoff and Widmann AG
Priority to AT90115659T priority Critical patent/ATE99371T1/de
Publication of EP0414120A1 publication Critical patent/EP0414120A1/de
Application granted granted Critical
Publication of EP0414120B1 publication Critical patent/EP0414120B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18—Bulkheads or similar walls made solely of concrete in situ
    • E02D5/182—Bulkheads or similar walls made solely of concrete in situ using formworks to separate sections

Definitions

  • the invention relates to two methods for producing a sealing wall according to the preambles of claims 1 and 2 and two devices for performing these methods.
  • sealing walls in the ground is becoming increasingly important, particularly when coating landfills, particularly contaminated sites.
  • a high diffusion resistance must above all be striven for in the sealing materials to be used.
  • Sealing walls in the form of diaphragm walls made of concrete or reinforced concrete are usually manufactured in sections according to the classic diaphragm wall construction. After lifting out a diaphragm wall section, a formwork element is inserted into the slit section, with the support of the floor being supported by a supporting liquid as formwork for the joint surface delimiting this section in the direction of production.
  • This formwork element usually has the shape of a joint pipe, which creates a concave recess for the manufacture of the subsequent sections. The concrete is then poured in from the bottom up, displacing the support liquid upwards. The consumption of support fluid is relatively large.
  • the materials forming the sealing wall are premixed dry and, as a dry mixture, progressively introduced into the slit from bottom to top in sections extending over the entire height of the wall; the moisture required for the effectiveness of the mixture as a sealing layer is supplied after installation.
  • a formwork element dividing the slot in the transverse direction is again used.
  • the invention has for its object to provide an economical possibility for the production of a tight and thus secure sealing wall from mineral sealing materials, in particular to avoid construction joints in the manufacture of such a sealing wall in the floor.
  • the invention is based on the knowledge that when a mineral sealing material, in particular a clay mineral is installed as a dry, free-flowing mixture in the dry state, when the formwork element is pushed forward, a kind of basic fracture is generated in the dry mass behind it, as a result of which the top layer is fed Sealing material slips.
  • a specific basic fracture figure can be achieved by a specific shape of the wing walls, a possible inclination of the formwork wall or by exerting a vertical pressure on the freshly introduced material.
  • the internal friction of the material plays a major role; it can have the consequence that, from a certain depth, the limit value of the vertical pressure becomes smaller than the fluid pressure in the supporting fluid.
  • the angle of the internal friction is reduced in the material forming the sealing wall, for example by application of vibrations, as a result of which a denser bearing and also a larger one are achieved Pressure against the support fluid can be caused.
  • the active application of vertical and horizontal pressure by means of a rotating screw extending into the depth of the sealing wall material to be installed appears to be particularly advantageous.
  • the sealing wall material can also be subjected to a vertical force according to claim 2.
  • the dry preparation and introduction of the sealant create the preconditions for the individual components of the mixture to be classified according to grain size and type of substance and to be put together according to appropriate recipes. In this way, not only a particularly dense storage of the sealants, but also a composition of the same can be achieved both according to the grain size and according to the type, which are matched to a particular extent to any pollutants that occur can.
  • the coarse grain structure which can consist of one or more grain fractions, has a sufficiently large permeability for the fine grain and the volume of the fine grain fraction is equal or slightly larger is the pore volume of the coarse grain fraction.
  • the confluence of the two material components can also be improved by using materials in the fine grain fraction which have a particularly small internal angle of friction, such as Montmorillonite. It has been shown that with such a mixture structure it is technically possible to achieve a pore volume of less than 15%. This allows a pore volume of 25 to 20% to be achieved, taking into account the scatter in the final sealing layer.
  • the dry constituents of the mixture hydrophobic, i.e. to be water-repellent.
  • a hydrophobizing agent e.g. Stearic acid can be used.
  • Such hydrophobizing agents are expediently mixed in during the preparation of the dry mixture.
  • the components of the dry mix have a very high internal friction, so that the added hydrophobizing agents are distributed evenly during mixing and form a thin film on the surface of the individual grains.
  • Hydrophobing agents are generally organic compounds that degrade relatively quickly in the soil, so that the clay minerals can then absorb the moisture required for the sealing layer to function.
  • the devices according to claims 3 and 4 are specially adapted to introduce a dry mixture of a mineral sealing material so that the horizontal pressure of this material is equal to or greater than the hydraulic pressure of the supporting fluid, so that no flow around the formwork wall can occur through it , which could lead to defects in the sealing wall to be produced.
  • the formwork wall forms with side Wing walls an approximately U-shaped space for the sealing material to be introduced, which is a kind of funnel with a direct connection to the sealing wall to be produced. Due to the fact that the vibrating devices are not arranged on the formwork wall itself, but rather are arranged on or into the sealing wall extending pipes, it is possible to compress the dry material located within this space on the one hand and on the other hand when advancing the formwork element if there is one behind it Basic fracture figure forms to connect the newly installed material with the one already in place so that a faultless sealing wall is created.
  • FIG. 1 A first embodiment of the invention is shown in FIG. 1 in a horizontal section and in FIG. 2 in a vertical section through a slot in which there is a device for introducing dry mineral sealing wall material.
  • a shuttering element 3 dividing the slot 1 in the transverse direction and extending over its entire depth.
  • the shuttering element 3 consists of a box-shaped Housing 4 made of steel with a front wall 5 facing the supporting liquid 2, a rear wall 6 and side walls 7. The cavity formed by these walls is closed at the bottom by a base plate 8. The base plate 8 continues forward in a runner 9. The cavity enclosed by this box-shaped housing 4 is accessible from above.
  • the rear wall 6 of the housing 4 also serves as a partition or formwork wall for the sealing wall material 10, which fills the slot 1 behind the direction of advance indicated by an arrow 11.
  • the box-shaped housing 4 is provided on its rear side with side wing walls 12 which, together with the rear or formwork wall 6, form a space 13 which is approximately U-shaped in cross section (FIG. 1).
  • the wing walls 12 have a backward and outward slope; they can also slope from top to bottom to facilitate sagging of the sealant.
  • the space 13 formed by the wing walls 12 and the rear wall 6 is closed by a drag plate 14 which extends the base plate 8.
  • an apron 15 can be provided, which creates the seal to the sole 16 of the slot 1 in the event of unevenness.
  • At the upper end of the U-shaped space 13 there is a storage container 17 for the sealing wall material 10 in the form of a filling funnel.
  • the compression of the sealing wall material 10 is achieved by means of vibration devices (not shown) which are accommodated in support tubes 18.
  • the support tubes 18 pass through the rear wall 6 and are supported against the front wall 5 of the housing 4 by cylinder-piston units 19. In this way, the advance can be achieved by extending the cylinder-piston units 19 while supporting the tubes 18 with respect to the sealing material 10 that has already been introduced and compressed of the entire formwork element 3 are effected.
  • the tubes 18 can also be telescoped or provided with special support devices.
  • the formwork element 3 ' consists of a housing 4' with a front wall 5 ', a rear wall 6' and side walls 7 'and a base plate 8'. Lateral wing walls 12 ', a lower drag plate 14' and a storage container 17 'are also provided, as are tubes 18' with vibration devices (not shown) arranged therein.
  • the feed takes place by means of cylinder-piston units 20 which are arranged between the rear wall 6' and a special formwork wall 21 which can be displaced in the U-shaped space 13 'between the side wing walls 12'.
  • This formwork wall 21 thus forms an abutment on the sealing wall for the cylinder-piston units 20, so that by means of the cylinder-piston units 20 the housing 4 'can be moved in the direction of arrow 11.
  • the form of the formwork element 3 ′′ and the housing 4 ′′ follows the embodiment of FIGS. 3 and 4, in particular also with regard to the feed with between the rear wall 6 ′′ and a cylinder wall / piston unit 20 arranged in a formwork wall 22.
  • a helical compression screw 23 with a vertical axis of rotation 24 in the U-shaped space 13 ′′ formed by the wing walls 12 ′′ and the formwork wall 22 arranged.
  • the worm 23 is driven by a drive indicated at 25 with a conveying direction directed in the depth.
  • the compression screw 23 can be designed as a screw conveyor. However, a design of the screw 23 in the manner of a baroque spiral column with a circular cross section appears to be particularly expedient.
  • Such a screw not only causes material to be conveyed in the direction of its longitudinal axis, but is also capable of exerting pressure on the material in the horizontal direction, so that the material moving in from above through the hopper 17 '' also usually moves sideways to press unavoidable unevenness into the slot walls.
  • care must be taken to ensure that the horizontal feed of the screw 23 and the housing 4 ′′ take place synchronously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP90115659A 1989-08-24 1990-08-16 Verfahren zum Herstellen einer Dichtwand sowie Vorrichtung zum Durchführen des Verfahrens Expired - Lifetime EP0414120B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90115659T ATE99371T1 (de) 1989-08-24 1990-08-16 Verfahren zum herstellen einer dichtwand sowie vorrichtung zum durchfuehren des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3927933A DE3927933A1 (de) 1989-08-24 1989-08-24 Verfahren zum herstellen einer dichtwand sowie vorrichtung zum durchfuehren des verfahrens
DE3927933 1989-08-24

Publications (2)

Publication Number Publication Date
EP0414120A1 EP0414120A1 (de) 1991-02-27
EP0414120B1 true EP0414120B1 (de) 1993-12-29

Family

ID=6387764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115659A Expired - Lifetime EP0414120B1 (de) 1989-08-24 1990-08-16 Verfahren zum Herstellen einer Dichtwand sowie Vorrichtung zum Durchführen des Verfahrens

Country Status (3)

Country Link
EP (1) EP0414120B1 (enrdf_load_stackoverflow)
AT (1) ATE99371T1 (enrdf_load_stackoverflow)
DE (2) DE3927933A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321730C2 (de) * 1993-06-30 1998-07-02 Bilfinger Berger Bau Kombinationsabdichtung für Abfalldeponien mit Steil- bis Senkrechtwandungen und/oder -böschungen als Deponiebegrenzungen
GB9514814D0 (en) * 1995-07-19 1995-09-20 Bicc Plc Formwork for construction in concrete

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048710A (en) * 1932-11-25 1936-07-28 Ranney Leo Process for building underground structures and apparatus therefor
AT225629B (de) * 1955-03-03 1963-01-25 Tito Dipl Ing Ognibeni Verfahren und Einrichtung zur Herstellung von Gräben und zur Bildung von Dichtungsschürzen
FR1260016A (fr) * 1959-12-12 1961-05-05 Costa Fu Ernanio Flli Procédé et dispositif pour l'exécution d'infrastructures en béton, béton armé ou similaires par forages parallèles, et coulée simultanée de béton ou de ciment
US3603099A (en) * 1968-01-22 1971-09-07 Przed Specjalistyczne Gornictw Process of making intraground waterproof baffles and a device therefor
CH503847A (de) * 1969-02-27 1971-02-28 Mengis Geb Vorrichtung zum Ziehen eines Grabens und Verfahren zum Betrieb derselben
DE2019170B2 (de) * 1970-04-21 1972-02-17 Siemens AG, 1000 Berlin u. 8000 München Wickeldorn
US3893302A (en) * 1973-10-25 1975-07-08 Rapidex Inc Machine and method for excavating trenches and for constructing walls in trenches
DE3604736A1 (de) * 1986-02-14 1986-07-17 Andert, Kurt, Dipl.-Ing., 2900 Oldenburg Fraeswand
DE3717885C3 (de) * 1987-05-27 1994-12-15 Dyckerhoff & Widmann Ag Verfahren und Vorrichtung zum Herstellen einer Dichtungsschicht aus mineralischen Dichtungsmaterialien
DE3740156A1 (de) * 1987-08-11 1989-02-23 Heinz Hertig Verfahren zur herstellung einer schlitzwand
DE3823874C1 (en) * 1988-07-14 1989-11-16 Dyckerhoff & Widmann Ag, 8000 Muenchen, De Dry mixture for producing a flat-spread sealing layer

Also Published As

Publication number Publication date
EP0414120A1 (de) 1991-02-27
DE59004016D1 (de) 1994-02-10
ATE99371T1 (de) 1994-01-15
DE3927933A1 (de) 1991-03-21
DE3927933C2 (enrdf_load_stackoverflow) 1991-11-07

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