EP0360145B1 - Method for sealing off existing waste sites or polluted areas - Google Patents

Method for sealing off existing waste sites or polluted areas Download PDF

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Publication number
EP0360145B1
EP0360145B1 EP89116983A EP89116983A EP0360145B1 EP 0360145 B1 EP0360145 B1 EP 0360145B1 EP 89116983 A EP89116983 A EP 89116983A EP 89116983 A EP89116983 A EP 89116983A EP 0360145 B1 EP0360145 B1 EP 0360145B1
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EP
European Patent Office
Prior art keywords
sealing
drawn
blade
tubes
mineral
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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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EP89116983A
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German (de)
French (fr)
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EP0360145A3 (en
EP0360145A2 (en
Inventor
Josef Ofenstein
Edmund Hertle
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Alfred Kunz GmbH and Co
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Alfred Kunz GmbH and Co
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Priority claimed from DE19893900391 external-priority patent/DE3900391A1/en
Application filed by Alfred Kunz GmbH and Co filed Critical Alfred Kunz GmbH and Co
Priority to AT89116983T priority Critical patent/ATE83022T1/en
Publication of EP0360145A2 publication Critical patent/EP0360145A2/en
Publication of EP0360145A3 publication Critical patent/EP0360145A3/en
Application granted granted Critical
Publication of EP0360145B1 publication Critical patent/EP0360145B1/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/002Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/006Sealing of existing landfills, e.g. using mining techniques

Definitions

  • the invention relates to a method for sealing existing garbage dumps or contaminated areas, in which pipes are driven under the garbage dump or contaminated area and a sword is preferred between each two pipes running approximately parallel to one another and in which the sealing layer lying side by side between the soil layers separated from the sword Plastic geomembranes are drawn in, which are sealed together along their edges.
  • landfills were often built with inadequate waterproofing towards the groundwater or no waterproofing at all, so that pollutants could seep into the ground with the surface water and get into the groundwater. It is therefore an urgent task today to subsequently seal existing landfill sites that have become leaky or that have no sealing at all to protect the groundwater.
  • the sealing sheets used for sealing are attached directly to the bar and are drawn forward between two tubes in the longitudinal direction of the tubes.
  • the known method still has problems with the sealing connection of the edge region of the sealing sheet that was last drawn in to the edge area of the previously drawn sealing sheet. Apart from these difficulties in pulling in the sealing sheets, the known method does not allow a reliable control as to whether the inserted sealing sheets form a tight layer and a safe barrier against the groundwater. After all, a plastic seal is only a relatively thin barrier that can easily be damaged by subsidence and displacement in the floor.
  • the object of the invention is therefore to provide a method of the type specified, which controls the proper retraction of the sealing membrane and the tight connection of the Paths to a sealing layer allowed and this enables the creation of a sealing layer largely insensitive to ground movements.
  • this object is achieved in a method of the generic type in that the sword is pulled forward by approximately one sealing membrane width and the sealing membrane is drawn in through a gap space of the sword, that an edge of the last inserted plastic sealing membrane in the gap space with the free edge of the preceding one Plastic sealing membrane connected and that a mineral sealing compound is introduced at least on one side of the sealing membrane while the sword is preferred.
  • the mineral sealing compound is expediently installed on both sides of the sealing membrane.
  • tubes which are essentially parallel to one another are first pressed under the area or landfill to be underpinned.
  • These pipes can be pre-pressed from construction pits created on the side of the landfill or surface, or can also be driven directly from the surface if the pipes take an arcuate curve and thereby undercut the landfill or contaminated area in an approximately shell-like manner.
  • the tubes which are successively pre-pressed at a distance of about 10 to 20 m, therefore expediently have a diameter of about 2 m or more.
  • the pipes are pre-pressed in sections, with the soil at the front the pipes can be dismantled and discharged through the pipes. Pipe sections can be successively welded to the pipe section being driven. The pipes can be pressed in in a known manner by means of suitable feed presses.
  • the sword is drawn between two pipes, preferably between the two last pressed pipes, so that progressive pipe jacking can be carried out with the creation of the sealing layer.
  • the sword is provided with an approximately horizontally running gap, through which, after the sword is preferred, the sealing membrane can be drawn in transversely in a controllable manner by approximately one sealing membrane width.
  • the sealing membrane is expediently drawn in such that the last inserted with its side edge overlaps the free side edge of the previously inserted sealing sheet, so that this overlap area can then be welded under the protection of the gap space of the sword.
  • the method according to the invention thus once allows a reliable check that the sealing sheets are drawn in without damage and are tightly connected to one another.
  • the introduction of the mineral sealing compound turns it into a composite seal created, which offers high security against the passage of liquid pollutants and water.
  • the tubes previously drawn in are expediently slit laterally when the sword is pulled forward and the top and bottom shells of the tubes are supported against one another.
  • conventional pulling presses can be used, which are gradually shifted forward and articulated on anchors correspondingly gradually shifted forward.
  • the tubular shells which are slotted on one or both sides can be supported by appropriately curved supports and presses connecting them, or else by appropriate expansion.
  • the pipes can also be stiffened with a steel frame so that there is no need for support.
  • a sliding formwork sealing the slotted lateral gap of the tube is expediently drawn with the sword. This prevents the injected mineral sealant from entering the tube before it hardens.
  • a rapidly hardening mineral sealing compound is expediently used, which is able to absorb the earth pressure relatively quickly. Because the mineral sealant is also introduced as a replacement for the soil removed by the advanced sword, so that it must absorb the ground pressure after pulling the sword.
  • the mineral sealant expediently presents liquids with such a great resistance that its flow velocity in the sealant is in the range of 10 ⁇ 9 m / sec.
  • the flow rate can also be lower.
  • the sealing compound therefore also acts as a seal itself and not only as protection for the plastic seal enclosed by it.
  • the thickness of the layer of the mineral sealing compound is expediently about 50 to 100 cm and preferably about 65 cm. If the sealing compound is installed on one side, the thickness of the mineral sealing layer can range from 25 to 70 cm and the total thickness can range from 50 to 100 cm.
  • the sealing strips are expediently drawn in with their edge regions overlapping one another and connected to one another by weld seams running parallel to one another. These weld seams, as it were, delimit a tubular part of the plastic seal, which can be inflated with compressed air to check tightness and strength.
  • a particular advantage of the method according to the invention is that the weld seam can be checked for its tightness and strength and that the weld seam can be separated and the sealing membrane can be re-welded in the event of a faulty welded joint.
  • the plastic sealing membrane can also be cut to size if the position is inaccurate.
  • the geomembranes are expediently introduced into the tubes in rolls so that they are unwound from them when they are pulled through the gap of the sword. To unwind and process the geomembranes facilitate, they can be heated by appropriate heating devices.
  • the sealing sheets within the pipes can be tightly connected to one another by plastic sealing sections.
  • the plastic sealing sheets can in turn be connected to one another in a verifiable manner.
  • two sealing sheets are drawn in transversely through the gap of the sword. These two sealing sheets, the edges of which are connected in the manner described to the edges of the previously drawn-in sealing sheets, form a two-layer seal which creates a double barrier against possible leakage points.
  • a filler is expediently introduced between the two sealing sheets. This filler supports the two sealing layers and can also have a sealing effect.
  • a mineral sealant can preferably be used as the filler.
  • the pipes can be kept in a walk-on form so that subsequent checks are possible.
  • the tubes are expediently filled with a filler material, at least in the lower region liquid-permeable material is introduced which serves as a filter and / or drainage layer. It can hardly be avoided that liquid collects in the tubes, which can then be drawn off and disposed of through this filter and / or drainage layer.
  • the pipes are expediently installed in such a way that they lie on a spherically curved, shell-shaped surface. At As already mentioned, this arrangement avoids lateral excavation pits from which the pipes would otherwise have to be pressed. With such a bowl-shaped arrangement of the pipes, it is only necessary to provide the deepest pipes with drainage devices.
  • the floor in front of the shield can be removed and removed through the pipes if a gap is preferred.
  • a device for carrying out the method according to the invention is characterized in that the sword consists of a ridge-side and a bottom-side plate-shaped shell which, starting from a front cross member, are supported by fork-shaped carriers which run out towards the rear.
  • the gap through which the sealing membrane can be drawn in is formed between these fork-shaped supports.
  • This gap space is expediently designed to widen towards its rear end, so that it creates the necessary freedom in the rear area for the performance of work, for example welding work.
  • the bottom shell is expediently provided in its rear region with a transversely extending table-like web, which serves as an abutment for a transversely movable welding carriage.
  • This table-like web is expediently heatable in order to give the edge regions of the plastic sealing sheets to be welded the necessary flexibility and suppleness.
  • the table-like web can be designed to oscillate in height, as a result of which the layer thickness of the sealing compound above and below the plastic sealing membrane can be adapted to the requirements.
  • a transversely extending strip-shaped apron made of flexible and / or elastic material is fastened in the rear region of the upper shell.
  • This apron prevents nozzles attached from the rear end region of the sword when the mineral sealant is being injected or introduced and penetrates into the gap space of the sword.
  • the seal can be formed on the underside of the sealing membrane by the web-like table itself.
  • ejection nozzles for introducing the mineral sealing compound are provided in the rear end region of the upper and lower shell.
  • the upper and lower bowl-shaped plates of the sword can be provided with nozzle-shaped bores for ejecting lubricants.
  • the front of the sword or shield can be provided with a scraper conveyor or other mining device, the endless chains of which run around vertical axes in the area of the lateral tubes.
  • the material released from the scraper conveyor and conveyed into the tube can then be discharged through a tube in the usual way.
  • the geomembrane which is drawn off the roll in accordance with the preference of the sword or shield and emerges therefrom consists of a suitable thermoplastic material or else of a composite gasket with corresponding inlays.
  • the seal can also consist of other plastic materials with or without additives.
  • the geomembranes drawn in in this way can then be connected to one another in a sealed manner in the region of the tubes serving the preference of the sword.
  • sealing sheets are drawn in according to the preference of the sword or shield without relative movement to the adjacent soil layers, no frictional forces damaging these can act on the sealing sheets.
  • proper pull-in can be checked so that the plastic webs drawn in by the method according to the invention ensure a secure seal.
  • the sword 2 consists of a front support structure 4, which forms a cross member stiffened by welded-in metal sheets, the end regions 5 of which protrude through lateral slots 6 in the guide and the tubes 1 serving as a preference.
  • the support structure 4 can consist of sections 7 screwed together in the manner shown in FIG.
  • Upper and lower cover plates 8, 9, between which a gap space 10 is formed, are connected to the upper flange and lower flange of the support structure 4.
  • the upper and lower support plates 8, 9 are braced by inclined beams and plates 11 and welded-in web plates in such a way that the gap space 10 extends from the front support structure 4 towards its end in a wedge shape.
  • a sheet 16 is arranged on transverse pedestal-shaped webs 12, 13, 14, which forms a sliding surface for the plastic sealing sheets 15 to be drawn in transversely.
  • the back of this one The sheet 16 provided with a sliding surface above the transverse base 14 serves as an abutment for the transversely movable plastic welding device 17, with which the overlapping side regions of the drawn-in sealing sheets are connected by two weld seams running parallel to one another.
  • a scraper conveyor or other mining device 19 On the front of the support structure 4 there is a scraper conveyor or other mining device 19, the endless chains of which run around vertical axes in the area of the pipes 1. The material released from the scraper conveyor 19 and conveyed into a tube is then discharged through a tube in a conventional manner.
  • nozzle-forming bores 21 are provided through which lubricants can be ejected.
  • the hydraulic cylinders of the hydraulic presses 3 are articulated to the end regions 5 of the support structure 4 projecting through the slots into the pipes.
  • the piston rods 24 are hinged to anchors 25, which are moved forward according to the preference of the sword 2.
  • the sword and / or the preferred presses can be supported by support structures 26 'provided with rollers in relation to the region of the lower surface line of the tubes.
  • the sealing membrane 15 is drawn in transversely by traction means, not shown.
  • the sealing membrane is unwound from the roller 26, the shaft of which is mounted in holders of the sword 2 within the outer tube 1 in the manner shown in FIGS. 1 and 4.
  • the geomembrane is drawn in in such a way that the last geomembrane drawn in is the edge of the previous one retracted section overlaps with its edge region in the manner shown in FIGS. 1 and 2.
  • Two parallel weld seams 27 are then introduced into this overlap area by the transversely displaceable plastic welding device 17.
  • the shield 2 is pulled forward by one sheet width.
  • mineral sealing compounds are pressed out of nozzles 28, 29 which are arranged in the rear end region of the sword below the upper cover plate and above the lower cover plate, which replace the previously discharged base and form a composite seal together with the plastic seal enclosed by them.
  • a strip-shaped apron 30 made of elastic and / or elastomeric material is attached to a transverse holding plate of the cover plate 8, which strips as a sealing lip over the retracted plastic sealing strips and penetration of the pressed-in mineral sealing compound prevented in the gap space 10.
  • a sealing lip can be dispensed with below the sealing sheets 15 because the web-shaped base 14 and the sliding plate 16 can take over the corresponding sealing function.
  • the upper and lower tubular shells 33, 34 formed by the longitudinal slots 6 are supported against one another by arcuate supports 35, 36 and hydraulic supports 37 connecting them.
  • a slide formwork 39 sealing the gap is dragged along by the sword 2.
  • the sliding formwork can be connected to the sword structure in an articulated or movable manner and additionally pressed against the gap. This configuration allows changes in distance to be compensated for in a simple manner.
  • the end regions of the drawn-in sealing sections 15 projecting into these are connected to one another by sealing sheet sections 40, the overlapping edge regions of which are also welded to one another in the manner described.
  • the tubes 1 can also be filled with a filling material 41, the filling material 41 being supported by a formwork 42.

Description

Die Erfindung betrifft ein Verfahren zum Abdichten bestehender Mülldeponien oder kontaminierter Flächen, bei dem unter die Mülldeponie oder kontaminierte Fläche Rohre vorgetrieben werden und zwischen jeweils zwei etwa parallel zueinander verlaufenden Rohren ein Schwert vorgezogen wird und bei dem zwischen die von dem Schwert getrennten Bodenschichten nebeneinander liegende dichtende Kunststoff-Dichtungsbahnen eingezogen werden, die längs ihrer Ränder miteinander dichtend verbunden werden.The invention relates to a method for sealing existing garbage dumps or contaminated areas, in which pipes are driven under the garbage dump or contaminated area and a sword is preferred between each two pipes running approximately parallel to one another and in which the sealing layer lying side by side between the soil layers separated from the sword Plastic geomembranes are drawn in, which are sealed together along their edges.

In der Vergangenheit wurden Mülldeponien häufig mit unzureichender Abdichtung zum Grundwasser hin oder überhaupt ohne Abdichtung errichtet, so daß aus diesen mit dem Oberflächenwasser Schadstoffe in den Boden einsickern und in das Grundwasser gelangen konnten. Es ist daher heute eine vordringliche Aufgabe, bestehende Mülldeponien, die undicht geworden sind, oder die überhaupt keine Abdichtung aufweisen, nachträglich zum Schutz des Grundwassers abzudichten.In the past, landfills were often built with inadequate waterproofing towards the groundwater or no waterproofing at all, so that pollutants could seep into the ground with the surface water and get into the groundwater. It is therefore an urgent task today to subsequently seal existing landfill sites that have become leaky or that have no sealing at all to protect the groundwater.

Darüber hinaus gibt es zahlreiche durch gefährliche Chemikalien und Schwermetalle kontaminierte Flächen, insbesondere in der Umgebung von Industrieanlagen mit entsprechenden gefährlichen Emissionen, die ebenfalls zum Grundwasser hin abgedichtet werden müssen, um dessen weitere Verseuchung zu verhindern.In addition, there are numerous areas contaminated by hazardous chemicals and heavy metals, especially in the vicinity of industrial plants with corresponding hazardous emissions, which must also be sealed off from the groundwater to prevent its further contamination.

Bei einem aus der EP-A-189 158 bekannten Verfahren der eingangs angegebenen Art werden die der Abdichtung dienenden Dichtungsbahnen unmittelbar an das Schwert angehängt und in Längsrichtung der Rohre jeweils zwischen zwei Rohren vorgezogen.In a method of the type specified at the outset, which is known from EP-A-189 158, the sealing sheets used for sealing are attached directly to the bar and are drawn forward between two tubes in the longitudinal direction of the tubes.

Bei diesem bekannten Verfahren treten zwischen der jeweils vorgezogenen Dichtungsbahn und den angrenzenden Bodenschichten erhebliche Reibungskräfte auf, so daß die Dichtungsbahn selbst dann aus sehr festem und durch Einlagen, vorzugsweise Gewebeeinlagen, verstärktem Material bestehen muß, auch wenn beidseits der Dichtungsbahn die Reibung vermindernde Gleitmittel aufgebracht werden.In this known method, considerable frictional forces occur between the respective preferred sealing membrane and the adjacent floor layers, so that the sealing membrane must then consist of very strong material reinforced by inserts, preferably fabric inserts, even if the friction-reducing lubricant is applied to both sides of the sealing membrane .

Problematisch ist bei dem bekannten Verfahren weiterhin der dichtende Anschluß des Randbereiches der zuletzt eingezogenen Dichtungsbahn an den Randbereich der zuvor eingezogenen Dichtungsbahn. Abgesehen von diesen Schwierigkeiten bei dem Einziehen der Dichtungbahnen gestattet das bekannte Verfahren keine sichere Kontrolle, ob die eingezogenen Dichtungsbahnen eine dichte Schicht und sichere Barriere gegenüber dem Grundwasser bilden. Schließlich ist eine Kunststoffdichtung eine nur relativ dünne Barriere, die bei Setzungen und Verschiebungen im Boden leicht beschädigt werden kann.The known method still has problems with the sealing connection of the edge region of the sealing sheet that was last drawn in to the edge area of the previously drawn sealing sheet. Apart from these difficulties in pulling in the sealing sheets, the known method does not allow a reliable control as to whether the inserted sealing sheets form a tight layer and a safe barrier against the groundwater. After all, a plastic seal is only a relatively thin barrier that can easily be damaged by subsidence and displacement in the floor.

Aufgabe der Erfindung ist es daher, ein Verfahren der eingangs angegebenen Art zu schaffen, das eine Kontrolle des ordnungsgemäßen Einzugs der Dichtungsbahn und der dichten Verbindung der Bahnen zu einer dichtenden Schicht erlaubt und über dies die Erstellung einer gegen Bodenbewegungen weitgehend unempfindlichen dichtenden Schicht ermöglicht.The object of the invention is therefore to provide a method of the type specified, which controls the proper retraction of the sealing membrane and the tight connection of the Paths to a sealing layer allowed and this enables the creation of a sealing layer largely insensitive to ground movements.

Erfindungsgemäß wird diese Aufgabe bei einem Verfahren der gattungsgemäßen Art dadurch gelöst, daß das Schwert um jeweils etwa eine Dichtungsbahnbreite vorgezogen und die Dichtungsbahn guer durch einen Spaltraum des Schwertes eingezogen wird, daß ein Rand der zuletzt eingezogenen Kunststoffdichtungsbahn in dem Spaltraum mit dem freien Rand der vorhergehenden Kunststoffdichtungsbahn verbunden und daß während des Vorzugs des Schwertes mindestens auf einer Seite der Dichtungsbahn eine mineralische Dichtungsmasse eingebracht wird. Zweckmäßigerweise wird die mineralische Dichtmasse jedoch beidseits der Dichtungsbahn eingebaut. Weiterhin besteht die Möglichkeit, ein Filtervlies einzubauen.According to the invention, this object is achieved in a method of the generic type in that the sword is pulled forward by approximately one sealing membrane width and the sealing membrane is drawn in through a gap space of the sword, that an edge of the last inserted plastic sealing membrane in the gap space with the free edge of the preceding one Plastic sealing membrane connected and that a mineral sealing compound is introduced at least on one side of the sealing membrane while the sword is preferred. However, the mineral sealing compound is expediently installed on both sides of the sealing membrane. There is also the option of installing a filter fleece.

Nach dem erfindungsgemäßen Verfahren werden unter die zu unterfangende Fläche oder Deponie zunächst im wesentlichen zueinander parallele Rohre vorgepreßt. Diese Rohre können ausgehend von seitlich der Deponie oder Fläche erstellten Baugruben aus vorgepreßt oder aber auch direkt von der Oberfläche her vorgetrieben werden, wenn die Rohre einen bogenartig gekrümmten Verlauf einnehmen und dadurch die Deponie oder kontaminierte Fläche etwa schalenförmig unterfangen.According to the method of the invention, tubes which are essentially parallel to one another are first pressed under the area or landfill to be underpinned. These pipes can be pre-pressed from construction pits created on the side of the landfill or surface, or can also be driven directly from the surface if the pipes take an arcuate curve and thereby undercut the landfill or contaminated area in an approximately shell-like manner.

Da die Rohre die Vorzugseinrichtungen für das Schwert aufnehmen müssen und gleichzeitig auch als Arbeitsraum und der Abförderung und dem Einbringen von Material dienen, müssen sie einen ausreichend großen Durchmesser aufweisen, um begehbar zu sein. Die Rohre, die aufeinanderfolgend in einem Abstand von etwa 10 bis 20 m vorgepreßt werden, weisen daher zweckmäßigerweise einen Durchmesser von etwa 2 m oder mehr auf. Die Rohre werden dabei abschnittweise vorgepreßt, wobei das Erdreich an der Stirnseite der Rohre abgebaut und durch die Rohre ausgetragen werden kann. An die jeweils vorgetriebene Strecke der Rohre können aufeinanderfolgend Rohrabschnitte angeschweißt werden. Das Einpressen der Rohre kann in bekannter Weise durch geeignete Vorschubpressen geschehen.Since the pipes must accommodate the preferred devices for the sword and at the same time also serve as a work area and the removal and introduction of material, they must have a sufficiently large diameter to be accessible. The tubes, which are successively pre-pressed at a distance of about 10 to 20 m, therefore expediently have a diameter of about 2 m or more. The pipes are pre-pressed in sections, with the soil at the front the pipes can be dismantled and discharged through the pipes. Pipe sections can be successively welded to the pipe section being driven. The pipes can be pressed in in a known manner by means of suitable feed presses.

Nach dem erfindungsgemäßen Verfahren wird das Schwert jeweils zwischen zwei Rohren vorgezogen, und zwar vorzugsweise zwischen den beiden jeweils zuletzt eingepreßten Rohren, so daß ein fortschreitender Rohrvortrieb mit nachgeführter Erstellung der Dichtungsschicht erfolgen kann.According to the method of the invention, the sword is drawn between two pipes, preferably between the two last pressed pipes, so that progressive pipe jacking can be carried out with the creation of the sealing layer.

Das Schwert ist mit einem etwa horizontal verlaufenden Spaltraum versehen, durch den nach Vorzug des Schwertes um etwa eine Dichtungsbahnbreite die Dichtungsbahn in kontrollierbarer Weise quer eingezogen werden kann. Dabei wird die Dichtungsbahn zweckmäßigerweise so eingezogen, daß die zuletzt eingezogene mit ihrem Seitenrand den freien Seitenrand der zuvor eingezogenen Dichtungsbahn überlappt, so daß dann dieser Überlappungsbereich im Schutze des Spaltraumes des Schwertes verschweißt werden kann.The sword is provided with an approximately horizontally running gap, through which, after the sword is preferred, the sealing membrane can be drawn in transversely in a controllable manner by approximately one sealing membrane width. The sealing membrane is expediently drawn in such that the last inserted with its side edge overlaps the free side edge of the previously inserted sealing sheet, so that this overlap area can then be welded under the protection of the gap space of the sword.

Nach dem Anschluß eines Dichtungsbahnabschnittes wird sodann der durch das Schwert gebildete freie Raum beidseits der Folie mit einer mineralischen Dichtungsmasse verpreßt, so daß sich eine Verbunddichtung ergibt, die aus der mineralischen Dichtungsmasse und der von diesen eingefaßten Kunststoffdichtung besteht. Dadurch wird eine Verbunddichtung geschaffen, die weitgehend auch gegen Erdbewegungen unempfindlich ist.After the connection of a sealing membrane section, the free space formed by the sword is then pressed on both sides of the film with a mineral sealing compound, so that a composite seal results which consists of the mineral sealing compound and the plastic seal encased by it. This creates a composite seal that is largely insensitive to earth movements.

Das erfindungsgemäße Verfahren erlaubt also einmal eine sichere Kontrolle, daß die Dichtungsbahnen beschädigungsfrei eingezogen und dicht miteinander verbunden sind. Zum andern wird durch das Einbringen der mineralischen Dichtungsmasse eine Verbunddichtung geschaffen, die eine hohe Sicherheit gegen Durchtritt von flüssigen Schadstoffen und Wasser bietet.The method according to the invention thus once allows a reliable check that the sealing sheets are drawn in without damage and are tightly connected to one another. On the other hand, the introduction of the mineral sealing compound turns it into a composite seal created, which offers high security against the passage of liquid pollutants and water.

Der Quereinzug von Dichtungsbahnen zwischen zwei im wesentlichen zueinander parallelen Rohren durch eine Schicht aus noch nicht erhärtertem Dichtungsmaterial ist an sich aus der DE-A-35 24 720 bekannt. Dieses bekannte Verfahren erlaubt aber keine sichere Kontrolle des Einzugs der Dichtungsbahnabschnitte und der Verbindungen der aufeinander folgend eingezogenen Dichtungsbahnabschnitte miteinander.The transverse insertion of sealing sheets between two substantially parallel pipes through a layer of sealing material which has not yet hardened is known per se from DE-A-35 24 720. However, this known method does not allow reliable control of the pull-in of the sealing sheet sections and the connections of the sealing sheet sections drawn in one after the other.

Zweckmäßigerweise werden die zuvor eingezogenen Rohre beim Vorziehen des Schwertes seitlich geschlitzt und die Kopf- und Bodenschalen der Rohre gegeneinander abgestützt. Zum Vorziehen des Schwertes können übliche Vorzugpressen verwendet werden, die schrittweise nach vorne versetzt und an entsprechend schrittweise nach vorne versetzten Verankerungen angelenkt werden. Die Abstützung der einseitig oder beidseitig geschlitzten Rohrschalen kann durch entsprechend bogenförmig gekrümmte Träger und diese verbindende Pressen, oder aber auch durch einen entsprechenden Ausbau erfolgen. Die Rohre können auch mit einem Stahlrahmen ausgesteift werden, so daß eine Abstützung entfällt.The tubes previously drawn in are expediently slit laterally when the sword is pulled forward and the top and bottom shells of the tubes are supported against one another. For pulling the sword forward, conventional pulling presses can be used, which are gradually shifted forward and articulated on anchors correspondingly gradually shifted forward. The tubular shells which are slotted on one or both sides can be supported by appropriately curved supports and presses connecting them, or else by appropriate expansion. The pipes can also be stiffened with a steel frame so that there is no need for support.

Zweckmäßigerweise wird mit dem Schwert eine den geschlitzten seitlichen Spalt des Rohres abdichtende Gleitschalung nachgezogen. Diese verhindert, daß die eingespritzte mineralische Dichtungsmasse vor ihrem Erhärten in das Rohr eindringt.A sliding formwork sealing the slotted lateral gap of the tube is expediently drawn with the sword. This prevents the injected mineral sealant from entering the tube before it hardens.

Zweckmäßigerweise wird eine schnell aushärtende mineralische Dichtungsmasse verwendet, die verhältnismäßig schnell in der Lage ist, den Erddruck aufzunehmen. Denn die mineralische Dichtungsmasse wird auch als Ersatz des durch das vorgezogene Schwert entfernten Bodens eingebracht, so daß diese nach dem Durchziehen des Schwertes den Bodendruck aufnehmen muß.A rapidly hardening mineral sealing compound is expediently used, which is able to absorb the earth pressure relatively quickly. Because the mineral sealant is also introduced as a replacement for the soil removed by the advanced sword, so that it must absorb the ground pressure after pulling the sword.

Zweckmäßigerweise setzt die mineralische Dichtungsmasse Flüssigkeiten einen so großen Widerstand entgegen, daß dessen Fließgeschwindigkeit in der Dichtungsmasse im Bereich von 10⁻⁹ m/sec liegt. Die Fließgeschwindigkeit kann aber auch kleiner sein. Die Dichtungsmasse wirkt daher auch selbst als Dichtung und nicht nur als Schutz für die von dieser eingefaßten Kunststoffdichtung.The mineral sealant expediently presents liquids with such a great resistance that its flow velocity in the sealant is in the range of 10⁻⁹ m / sec. The flow rate can also be lower. The sealing compound therefore also acts as a seal itself and not only as protection for the plastic seal enclosed by it.

Die Dicke der Schicht aus der mineralischen Dichtungsmasse einschließlich der von dieser eingefaßten Kunststoffdichtungsbahn beträgt zweckmäßigerweise etwa 50 bis 100 cm und vorzugsweise etwa 65 cm. Bei einseitigem Einbau der Dichtungsmasse kann die Stärke der mineralischen Dichtungsschicht im Bereich von 25 bis 70 cm und die Gesamtstärke bei 50 bis 100 cm liegen.The thickness of the layer of the mineral sealing compound, including the plastic sealing sheet enclosed by this, is expediently about 50 to 100 cm and preferably about 65 cm. If the sealing compound is installed on one side, the thickness of the mineral sealing layer can range from 25 to 70 cm and the total thickness can range from 50 to 100 cm.

Zweckmäßigerweise werden die Dichtungsbahnen mit ihren Randbereichen einander überlappend eingezogen und durch zueinander parallel verlaufende Schweißnähte miteinander verbunden. Diese Schweißnähte begrenzen gleichsam einen schlauchförmigen Teil der Kunststoffdichtung, der mit Preßluft zur Dichtigkeits- und Festigkeitskontrolle aufgeblasen werden kann. Ein besonderer Vorteil des erfindungsgemäßen Verfahrens liegt darin, daß sich die Schweißnaht auf ihre Dichtigkeit und Festigkeit hin prüfen läßt und daß bei einer fehlerhaften Schweißverbindung die Schweißnaht abgetrennt und die Dichtungsbahn neu verschweißt werden kann. Auch läßt sich bei einer Lageungenauigkeit die Kunststoffdichtungsbahn passend zuschneiden.The sealing strips are expediently drawn in with their edge regions overlapping one another and connected to one another by weld seams running parallel to one another. These weld seams, as it were, delimit a tubular part of the plastic seal, which can be inflated with compressed air to check tightness and strength. A particular advantage of the method according to the invention is that the weld seam can be checked for its tightness and strength and that the weld seam can be separated and the sealing membrane can be re-welded in the event of a faulty welded joint. The plastic sealing membrane can also be cut to size if the position is inaccurate.

Die Dichtungsbahnen werden zweckmäßigerweise in Rollen in die Rohre eingebracht, so daß diese von diesen beim Durchziehen durch den Spaltraum des Schwertes abgewickelt werden. Um ein Abwickeln und eine Verarbeitung der Dichtungsbahnen zu erleichtern, können diese durch entsprechende Heizeinrichtungen erwärmt werden.The geomembranes are expediently introduced into the tubes in rolls so that they are unwound from them when they are pulled through the gap of the sword. To unwind and process the geomembranes facilitate, they can be heated by appropriate heating devices.

Um eine durchgehende Kunststoffdichtung zu schaffen, können die Dichtungsbahnen innerhalb der Rohre durch Kunststoff-Dichtungs-Abschnitte dicht miteinander verbunden werden. Die Kunststoffdichtungsbahnen lassen sich wiederum nachprüfbar miteinander verbinden.In order to create a continuous plastic seal, the sealing sheets within the pipes can be tightly connected to one another by plastic sealing sections. The plastic sealing sheets can in turn be connected to one another in a verifiable manner.

Nach einer besonders vorteilhaften Ausgestaltung ist vorgesehen, daß zwei Dichtungsbahnen quer durch den Spaltraum des Schwertes eingezogen werden. Diese beiden Dichtungsbahnen, deren Ränder in der beschriebenen Weise die Ränder der zuvor eingezogenen Dichtungsbahnen angeschlossen werden, bilden eine zweilagige Abdichtung, die eine doppelte Barriere gegen eventuelle Leckstellen schafft.According to a particularly advantageous embodiment, it is provided that two sealing sheets are drawn in transversely through the gap of the sword. These two sealing sheets, the edges of which are connected in the manner described to the edges of the previously drawn-in sealing sheets, form a two-layer seal which creates a double barrier against possible leakage points.

Zweckmäßigerweise wird zwischen die beiden Dichtungsbahnen ein Füllstoff eingebracht. Dieser Füllstoff stützt die beiden Dichtungslagen ab und kann zusätzlich eine Dichtwirkung besitzen. Als Füllstoff kann vorzugsweise ein mineralischer Abdichtstoff verwendet werden.A filler is expediently introduced between the two sealing sheets. This filler supports the two sealing layers and can also have a sealing effect. A mineral sealant can preferably be used as the filler.

Die Rohre können in begehbarer Form beibehalten werden, so daß nachträgliche Kontrollen möglich sind. Zweckmäßigerweise werden die Rohre jedoch mit einem Füllmaterial verfüllt, wobei zumindest in den unteren Bereich flüssigkeitsdurchlässiges Material eingebracht wird, das als Filter- und/oder Drainageschicht dient. Es wird sich kaum vermeiden lassen, daß sich in den Rohren Flüssigkeit sammelt, die dann durch diese Filter- und/oder Drainageschicht abgezogen und entsorgt werden kann.The pipes can be kept in a walk-on form so that subsequent checks are possible. However, the tubes are expediently filled with a filler material, at least in the lower region liquid-permeable material is introduced which serves as a filter and / or drainage layer. It can hardly be avoided that liquid collects in the tubes, which can then be drawn off and disposed of through this filter and / or drainage layer.

Zweckmäßigerweise werden die Rohre derart eingebaut, daß sie auf einer sphärisch gekrümmten schalenförmigen Fläche liegen. Bei dieser Anordnung werden, wie bereits gesagt, seitliche Baugruben vermieden, von denen aus andernfalls die Rohre eingepreßt werden müßten. Bei einer derartigen schalenförmigen Anordnung der Rohre ist es weiterhin nur erforderlich, die am tiefsten liegenden Rohre mit Entwässerungseinrichtungen zu versehen.The pipes are expediently installed in such a way that they lie on a spherically curved, shell-shaped surface. At As already mentioned, this arrangement avoids lateral excavation pits from which the pipes would otherwise have to be pressed. With such a bowl-shaped arrangement of the pipes, it is only necessary to provide the deepest pipes with drainage devices.

Um ein möglichst störungsfreies Vorziehen des Schildes zu gewährleisten, kann bei dem Vorzug zur Bildung eines Spaltes der Boden vor dem Schild ausgetragen und durch die Rohre abgefördert werden.In order to ensure that the shield can be pulled out as smoothly as possible, the floor in front of the shield can be removed and removed through the pipes if a gap is preferred.

Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens ist erfindungsgemäß dadurch gekennzeichnet, daß das Schwert aus einer firstseitigen und einer bodenseitigen plattenförmigen Schale besteht, die ausgehend von einem vorderen Querträger durch nach hinten auslaufende gabelförmig angeordnete Träger abgestützt sind. Zwischen diesen gabelförmigen Trägern ist der Spaltraum gebildet, durch den die Dichtungsbahn eingezogen werden kann. Dieser Spaltraum wird zweckmäßigerweise sich zu seinem hinteren Ende hin erweiternd ausgestaltet, so daß er in seinem hinteren Bereich für die Ausübung von Arbeiten, beispielsweise Schweißarbeiten, den nötigen Freiraum bildet.A device for carrying out the method according to the invention is characterized in that the sword consists of a ridge-side and a bottom-side plate-shaped shell which, starting from a front cross member, are supported by fork-shaped carriers which run out towards the rear. The gap through which the sealing membrane can be drawn in is formed between these fork-shaped supports. This gap space is expediently designed to widen towards its rear end, so that it creates the necessary freedom in the rear area for the performance of work, for example welding work.

Zweckmäßigerweise ist die Bodenschale in ihrem hinteren Bereich mit einem quer verlaufenden tischartigen Steg versehen, der als Widerlager für einen quer verfahrbaren Schweißwagen dient. Zweckmäßigerweise ist dieser tischartige Steg beheizbar, um den zu verschweißenden Randbereichen der Kunststoffdichtungsbahnen die erforderliche Flexibilität und Schmiegsamkeit zu verleihen.The bottom shell is expediently provided in its rear region with a transversely extending table-like web, which serves as an abutment for a transversely movable welding carriage. This table-like web is expediently heatable in order to give the edge regions of the plastic sealing sheets to be welded the necessary flexibility and suppleness.

Der tischartige Steg kann in einer weiteren Variante in der Höhe pendelnd gestaltet werden, wodurch die Schichtstärke der Dichtmasse über und unter der Kunststoffdichtungsbahn den Erfordernissen angepaßt werden kann.In another variant, the table-like web can be designed to oscillate in height, as a result of which the layer thickness of the sealing compound above and below the plastic sealing membrane can be adapted to the requirements.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß im hinteren Bereich der oberen Schale eine quer verlaufende streifenförmige Schürze aus flexiblem und/oder elastischem Material befestigt ist. Diese Schürze verhindert, daß beim Eindüsen oder Einbringen der mineralischen Dichtungsmasse aus dem hinteren Endbereich des Schwertes angebrachten Düsen diese in den Spaltraum des Schwertes eindringt. Auf der Unterseite der Dichtungsbahn kann die Dichtung durch den stegartigen Tisch selbst gebildet werden.In a further embodiment of the invention it is provided that a transversely extending strip-shaped apron made of flexible and / or elastic material is fastened in the rear region of the upper shell. This apron prevents nozzles attached from the rear end region of the sword when the mineral sealant is being injected or introduced and penetrates into the gap space of the sword. The seal can be formed on the underside of the sealing membrane by the web-like table itself.

Zweckmäßigerweise sind im hinteren Endbereich der oberen und unteren Schale Ejektionsdüsen zum Einbringen der mineralischen Dichtungsmasse vorgesehen.Expediently, ejection nozzles for introducing the mineral sealing compound are provided in the rear end region of the upper and lower shell.

Die oberen und unteren schalenförmigen Platten des Schwertes können mit düsenförmigen Bohrungen zum Ejizieren von Gleitstoffen versehen sein.The upper and lower bowl-shaped plates of the sword can be provided with nozzle-shaped bores for ejecting lubricants.

Das Schwert oder Schild kann an seiner Vorderseite mit einem Kratzförderer oder einem anderen Abbaugerät versehen sein, dessen endlosen Ketten im Bereich der seitlichen Rohre um vertikale Achsen umlaufen. Das von dem Kratzförderer gelöste und in das Rohr geförderte Material kann sodann in üblicher Weise durch ein Rohr ausgetragen werden.The front of the sword or shield can be provided with a scraper conveyor or other mining device, the endless chains of which run around vertical axes in the area of the lateral tubes. The material released from the scraper conveyor and conveyed into the tube can then be discharged through a tube in the usual way.

Die von der Rolle entsprechend dem Vorzug des Schwertes oder Schildes abgezogene und aus diesem austretende Dichtungsbahn besteht aus einem geeigneten thermoplastischem Material oder aber auch aus einer Verbunddichtung mit entsprechenden Einlagen. Die Dichtung kann auch aus anderen Kunststoffmaterialien mit oder ohne Zusätzen bestehen.The geomembrane which is drawn off the roll in accordance with the preference of the sword or shield and emerges therefrom consists of a suitable thermoplastic material or else of a composite gasket with corresponding inlays. The seal can also consist of other plastic materials with or without additives.

Die in dieser Weise eingezogenen Dichtungsbahnen können sodann im Bereich der dem Vorzug des Schwertes dienenden Rohre dichtend miteinander verbunden werden.The geomembranes drawn in in this way can then be connected to one another in a sealed manner in the region of the tubes serving the preference of the sword.

Da die Dichtungsbahnen entsprechend dem Vorzug des Schwertes oder Schildes ohne Relativbewegung zu den benachbarten Bodenschichten eingezogen werden, können auf die Dichtungsbahnen keine diese beschädigenden Reibungskräfte einwirken. Darüber hinaus läßt sich der ordnungsgemäße Einzug kontrollieren, so daß die nach dem erfindungsgemäßen Verfahren eingezogenen Kunststoffbahnen eine sichere Abdichtung gewährleisten.Since the sealing sheets are drawn in according to the preference of the sword or shield without relative movement to the adjacent soil layers, no frictional forces damaging these can act on the sealing sheets. In addition, the proper pull-in can be checked so that the plastic webs drawn in by the method according to the invention ensure a secure seal.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. In dieser zeigt

  • Fig.1 einen Horizontalschnitt durch das äußere Rohr und den in diesem vorgezogenen Schwert in der Ebene der eingezogenen Dichtungsbahn,
  • Fig.2 einen Längsschnitt durch das Rohr und das Schwert längs der Linie A-A in Fig.1,
  • Fig.3 einen Querschnitt durch das Schwert und das Rohr längs der Linie B-B in Fig.1,
  • Fig.4 einen Querschnitt durch das Rohr und den Schild längs der Linie C-C in Fig.1,
  • Fig.5 einen Querschnitt durch das Rohr mit Gleitschalung,
  • Fig. 6+7 einen Querschnitt durch das Rohr mit innerhalb des Rohres befindlichen Dichtungsabschnitten, die mit den quer eingezogenen Kunststoffbahnen verschweißt sind, und
  • Fig.8 einen vertikalen Längsschnitt durch das Rohr.
An embodiment of the invention is explained below with reference to the drawing. In this shows
  • 1 shows a horizontal section through the outer tube and the sword advanced in this in the plane of the drawn-in sealing membrane,
  • 2 shows a longitudinal section through the tube and the sword along the line AA in Fig.1,
  • 3 shows a cross section through the sword and the tube along the line BB in FIG. 1,
  • 4 shows a cross section through the tube and the shield along the line CC in Figure 1,
  • 5 shows a cross section through the tube with sliding formwork,
  • Fig. 6 + 7 shows a cross section through the tube with sealing sections located within the tube, which are welded to the transversely drawn plastic sheets, and
  • 8 shows a vertical longitudinal section through the tube.

Aus Fig.1 ist ein horizontaler Schnitt durch einen Abschnitt des zuletzt unter der nachträglich abzudichtenden Deponie eingezogenen Rohres dargestellt, in dem die äußere Seite des Schwertes 2 durch eine hydraulische Vorzugpresse 3 vorgezogen wird. Die nicht dargestellte gegenüberliegende Seite des Schwertes 2 wird in entsprechender Weise durch eine Vorzugpresse in dem davor liegenden Rohr vorgezogen.1 shows a horizontal section through a section of the pipe last drawn in under the landfill to be subsequently sealed, in which the outer side of the bar 2 is pulled forward by a hydraulic press 3. The opposite side of the sword 2, which is not shown, is correspondingly advanced by a preferred press in the tube in front of it.

Der Schwert 2 besteht aus einer vorderen Tragkonstruktion 4, die einen durch eingeschweißte Bleche ausgesteiften Querträger bildet, dessen Endbereiche 5 durch seitliche Schlitze 6 in der Führung und dem Vorzug dienenden Rohre 1 ragen. Die Trägerkonstruktion 4 kann in der aus Fig.3 ersichtlichen Weise aus miteinander verschraubten Abschnitten 7 bestehen.The sword 2 consists of a front support structure 4, which forms a cross member stiffened by welded-in metal sheets, the end regions 5 of which protrude through lateral slots 6 in the guide and the tubes 1 serving as a preference. The support structure 4 can consist of sections 7 screwed together in the manner shown in FIG.

An den Obergurt und Untergurt der Trägerkonstruktion 4 sind obere und untere Deckbleche 8,9 angeschlossen, zwischen denen ein Spaltraum 10 gebildet ist. Die oberen und unteren Stützbleche 8,9 sind durch schräg verlaufende Träger und Bleche 11 sowie eingeschweißte Stegbleche in der Weise ausgesteift, daß sich der Spaltraum 10 ausgehend von der vorderen Trägerkonstruktion 4 zu seinem Ende hin keilförmig erweitert. Etwa in der Mittelebene des Spaltraumes 10 ist ein auf quer verlaufenden sockelförmigen Stegen 12,13,14 gehaltertes Blech 16 angeordnet, das eine Gleitfläche für die quer einzuziehenden Kunststoffdichtungsbahnen 15 bildet. Der hintere Bereich dieses mit einer Gleitfläche versehenen Bleches 16 dient oberhalb des quer verlaufenden Sockels 14 als Widerlager für das quer verfahrbare Kunststoffschweißgerät 17, mit dem die einander überlappenden Seitenbereiche der eingezogenen Dichtungsbahnen durch zwei parallel zueinander verlaufende Schweißnähte verbunden werden.Upper and lower cover plates 8, 9, between which a gap space 10 is formed, are connected to the upper flange and lower flange of the support structure 4. The upper and lower support plates 8, 9 are braced by inclined beams and plates 11 and welded-in web plates in such a way that the gap space 10 extends from the front support structure 4 towards its end in a wedge shape. Approximately in the middle plane of the gap space 10, a sheet 16 is arranged on transverse pedestal-shaped webs 12, 13, 14, which forms a sliding surface for the plastic sealing sheets 15 to be drawn in transversely. The back of this one The sheet 16 provided with a sliding surface above the transverse base 14 serves as an abutment for the transversely movable plastic welding device 17, with which the overlapping side regions of the drawn-in sealing sheets are connected by two weld seams running parallel to one another.

Auf der Vorderseite der Trägerkonstruktion 4 ist ein Kratzförderer oder anderes Abbaugerät 19 angeordnet, dessen endlosen Ketten im Bereich der Rohre 1 um vertikale Achsen umlaufen. Das von dem Kratzförderer 19 gelöste und in ein Rohr geförderte Material wird sodann in üblicher Weise durch ein Rohr ausgetragen.On the front of the support structure 4 there is a scraper conveyor or other mining device 19, the endless chains of which run around vertical axes in the area of the pipes 1. The material released from the scraper conveyor 19 and conveyed into a tube is then discharged through a tube in a conventional manner.

In den oberen und unteren Deckblechen 8,9 des Schwertes 2 sind Düsen bildende Bohrungen 21 vorgesehen, durch die Gleitmittel ejiziert werden kann.In the upper and lower cover plates 8, 9 of the sword 2, nozzle-forming bores 21 are provided through which lubricants can be ejected.

An den durch die Schlitze in die Rohre ragenden Endbereiche 5 der Trägerkonstruktion 4 sind die Hydraulikzylinder der hydraulischen Pressen 3 angelenkt. Die Kolbenstangen 24 sind an Verankerungen 25 angelenkt, die entsprechend dem Vorzug des Schwertes 2 nach vorne versetzt werden. Der Schwert und/oder die Vorzugpressen können durch mit Rollen versehene Tragkonstruktionen 26′ gegenüber dem Bereich der unteren Mantellinie der Rohre abgestützt sein.The hydraulic cylinders of the hydraulic presses 3 are articulated to the end regions 5 of the support structure 4 projecting through the slots into the pipes. The piston rods 24 are hinged to anchors 25, which are moved forward according to the preference of the sword 2. The sword and / or the preferred presses can be supported by support structures 26 'provided with rollers in relation to the region of the lower surface line of the tubes.

Nach dem Vorzug des Schwertes 2 um eine Strecke, die der Breite der Kunststoffdichtungsbahnen 15 entspricht, wird durch nicht dargestellte Zugmittel die Dichtungsbahn 15 quer eingezogen. Hierzu wird die Dichtungsbahn von der Rolle 26 abgewickelt, deren Welle in Halterungen des Schwertes 2 innerhalb des äußeren Rohres 1 in der aus den Fig.1 und 4 ersichtlichen Weise gelagert ist. Dabei erfolgt der Einzug der Dichtungsbahn in der Weise, daß die zuletzt eingezogene Dichtungsbahn den Rand des zuvor eingezogenen Abschnitts mit ihrem Randbereich in der aus den Fig.1 und 2 ersichtlichen Weise überlappt. In diesen Überlappungsbereich werden anschließend durch das quer verfahrbare Kunststoffschweißgerät 17 zwei zueinander parallele Schweißnähte 27 eingebracht.After the sword 2 has been preferred by a distance which corresponds to the width of the plastic sealing membrane 15, the sealing membrane 15 is drawn in transversely by traction means, not shown. For this purpose, the sealing membrane is unwound from the roller 26, the shaft of which is mounted in holders of the sword 2 within the outer tube 1 in the manner shown in FIGS. 1 and 4. The geomembrane is drawn in in such a way that the last geomembrane drawn in is the edge of the previous one retracted section overlaps with its edge region in the manner shown in FIGS. 1 and 2. Two parallel weld seams 27 are then introduced into this overlap area by the transversely displaceable plastic welding device 17.

Nach der Verbindung des zuletzt eingezogenen Dichtungsbahnabschnitts mit dem Randbereich des zuvor eingezogenen Dichtungsbahnabschnitts wird der Schild 2 um eine Bahnbreite vorgezogen. Während dieses Vorzugs werden aus Düsen 28,29 die im hinteren Endbereich des Schwertes unterhalb des oberen Deckbleches und oberhalb des unteren Deckbleches angeordnet sind, mineralische Dichtungsmassen ausgepreßt, die den zuvor ausgetragenen Boden ersetzen und zusammen mit der von diesen eingeschlossenen Kunststoffdichtung eine Verbunddichtung bilden.After the connection of the last inserted sealing sheet section with the edge area of the previously drawn sealing sheet section, the shield 2 is pulled forward by one sheet width. During this preference, mineral sealing compounds are pressed out of nozzles 28, 29 which are arranged in the rear end region of the sword below the upper cover plate and above the lower cover plate, which replace the previously discharged base and form a composite seal together with the plastic seal enclosed by them.

Um zu verhindern, daß die Dichtungsmassen in den Spaltraum 10 eindringen, ist an einem quer verlaufenden Halteblech des Deckblechs 8 eine streifenförmige Schürze 30 aus elastischem und/oder elastomerem Material befestigt, die als Dichtungslippe über die eingezogenen Kunststoffdichtungsbahnen streicht und ein Eindringen der eingepreßten mineralischen Dichtungsmasse in den Spaltraum 10 verhindert.In order to prevent the sealing compounds from penetrating into the gap space 10, a strip-shaped apron 30 made of elastic and / or elastomeric material is attached to a transverse holding plate of the cover plate 8, which strips as a sealing lip over the retracted plastic sealing strips and penetration of the pressed-in mineral sealing compound prevented in the gap space 10.

Unterhalb der Dichtungsbahnen 15 kann auf eine Dichtungslippe verzichtet werden, weil der stegförmige Sockel 14 und das Gleitblech 16 die entsprechende Dichtungsfunktion übernehmen können.A sealing lip can be dispensed with below the sealing sheets 15 because the web-shaped base 14 and the sliding plate 16 can take over the corresponding sealing function.

Die durch die Längsschlitze 6 gebildeten oberen und unteren Rohrschalen 33,34 werden durch bogenförmige Träger 35,36 und diese verbindende hydraulische Stützen 37 gegeneinander abgestützt.The upper and lower tubular shells 33, 34 formed by the longitudinal slots 6 are supported against one another by arcuate supports 35, 36 and hydraulic supports 37 connecting them.

Um zu verhindern, daß vor dem Aussteifen der mineralischen Dichtungsmassen 38 diese in die Rohre 1 eindringen können, wird von dem Schwert 2 eine den Spalt abdichtende Gleitschalung 39 mitgeschleppt. Die Gleitschalung kann gelenkig oder beweglich an der Schwertkonstruktion angeschlossen werden und zusätzlich gegen den Spalt angepreßt werden. Durch diese Ausgestaltung können Abstandsänderungen in einfacher Weise ausgeglichen werden.To prevent the mineral from stiffening Sealing compounds 38 that can penetrate into the pipes 1, a slide formwork 39 sealing the gap is dragged along by the sword 2. The sliding formwork can be connected to the sword structure in an articulated or movable manner and additionally pressed against the gap. This configuration allows changes in distance to be compensated for in a simple manner.

Innerhalb der Rohre 1 werden die in diese hineinragenden Endbereiche der eingezogenen Dichtungsabschnitte 15 durch Dichtungsbahnabschnitte 40 miteinander verbunden, deren überlappenden Randbereiche ebenfalls in der beschriebenen Weise miteinander verschweißt werden.Within the tubes 1, the end regions of the drawn-in sealing sections 15 projecting into these are connected to one another by sealing sheet sections 40, the overlapping edge regions of which are also welded to one another in the manner described.

Nach dem Einzug der Kunststoffdichtung können auch die Rohre 1 mit einem Füllmaterial 41 verfüllt werden, wobei das Füllmaterial 41 durch eine Schalung 42 abgestützt wird.After the plastic seal has been drawn in, the tubes 1 can also be filled with a filling material 41, the filling material 41 being supported by a formwork 42.

Claims (19)

  1. A method for sealing already existing refuse tips or contaminated areas, in the case of which tubes (1) are installed generally parallel to each other underneath the refuse tip or the contaminated area and between each two respective tubes a blade (2) is drawn forwards and in the case of which between the earth layers separated by the blade adjacently arranged sealing synthetic resin sealing webs (15) are drawn in, which along their edges are sealingly connected together,
       characterized in that
       in that the blade is drawn forwards by respectively approximately one breadth of the sealing web at a time and the sealing web is drawn in transversely through a gap space (10) of the blade,
       in that one edge of the last drawn in sealing web is connected in the gap space with the free edge of the preceding sealing web and in that during the drawing forwards of the blade a mineral sealing composition is introduced at least on one side of the sealing web.
  2. The method as claimed in claim 1, characterized in that during forward movement of the blade the tubes are laterally slit and the top and bottom shells (38 and 34) of the tubes are supported in relation to each other.
  3. The method as claimed in claim 1 or in claim 2, characterized in that a sliding shell (39) is drawn trailing behind the blade, which shell seals the slit lateral gap (6) of the tube.
  4. The method as claimed as claimed in any one of the claims 1 through 3, characterized in that a rapid cure sealing mineral composition is pressed on at least one side of the drawn in sealing web.
  5. The method as claimed as claimed in any one of the claims 1 through 4, characterized in that the mineral sealing composition opposes liquids with such a resistance that the speed of flow thereof is of the order of 10⁻⁵ m/sec. at the most.
  6. The method as claimed as claimed in any one of the claims 1 through 5, characterized in that the thickness of the layer of mineral sealing composition is 50 to 100 cm and preferably approximately 65 cm.
  7. The method as claimed as claimed in any one of the claims 1 through 6, characterized in that the synthetic resin sealing webs are drawn in with their edges parts overlapping each other and are connected by weld seams (27) running parallel to each other.
  8. The method as claimed as claimed in any one of the claims 1 through 7, characterized in that the synthetic resin sealing webs are connected with each other within the tubes by means of synthetic resin sealing sections (40).
  9. The method as claimed as claimed in any one of the claims 1 through 8, characterized in that two sealing webs are drawn in transversely through the gap space of the blade.
  10. The method as claimed in claim 9, characterized in that a filler is introduced between the two sealing webs.
  11. The method as claimed in any one of the claims 1 through 10, characterized in that the tubes are filled with a filler material (41), liquid-permeable material being introduced in at least the lower part of the tubes, which material serves as a filter and/or draining layer.
  12. The method as claimed in any one of the claims 1 through 11, characterized in that the tubes are so installed that they rest on a spherical curved, shell-like surface.
  13. The method as claimed in any one of the claims 1 through 12, characterized in that in front of the blade being drawn along in order to form a gap earth is removed and led off through the tubes.
  14. An apparatus for performing the method as claimed in any one of the claims 1 through 13, characterized in that the blade consists of an upper and a lower plate (8 and 9) which starting at a front transverse support beam (4) are supported by support beams (11) tapering to the rear in a forked manner.
  15. The apparatus as claimed in claim 14, characterized in that in a rear part thereof the lower shell (9) is provided with a transversely extending table-like yoke (14), which functions as an abutment for a welding carriage (17) able to be moved transversely.
  16. The apparatus as claimed in claim 14 or in claim 15, characterized in that a transversely extending strip-like apron (30) of flexible and/or plastic material is secured in the rear part of the upper shell (8).
  17. The apparatus as claimed in any one of the claims 14 through 16, characterized in that ejection nozzles (28 and 29) for mineral sealing compositions are provided in the upper and the lower plates of the blade.
  18. The apparatus as claimed in any one of the claims 14 through 17, characterized in that the upper and the lower covering and bottom plates of the blade are provided with nozzle-like holes (24) for the injection of lubricants.
  19. The apparatus as claimed in claim 15, characterized in that the table-like yoke is suspended for a vertical pendulum movement.
EP89116983A 1988-09-21 1989-09-13 Method for sealing off existing waste sites or polluted areas Expired - Lifetime EP0360145B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116983T ATE83022T1 (en) 1988-09-21 1989-09-13 METHOD OF SEALING EXISTING LANDFILLS OR CONTAMINATED LAND.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE3832091 1988-09-21
DE3832091 1988-09-21
DE3833292 1988-09-30
DE3833292 1988-09-30
DE3900391 1989-01-09
DE19893900391 DE3900391A1 (en) 1988-09-21 1989-01-09 Method of sealing existing landfill sites or contaminated surfaces

Publications (3)

Publication Number Publication Date
EP0360145A2 EP0360145A2 (en) 1990-03-28
EP0360145A3 EP0360145A3 (en) 1991-02-27
EP0360145B1 true EP0360145B1 (en) 1992-12-02

Family

ID=27198250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116983A Expired - Lifetime EP0360145B1 (en) 1988-09-21 1989-09-13 Method for sealing off existing waste sites or polluted areas

Country Status (3)

Country Link
EP (1) EP0360145B1 (en)
DE (1) DE58902883D1 (en)
DK (1) DK464289A (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3407382C2 (en) * 1984-02-29 1994-08-04 Zueblin Ag Process for producing an approximately horizontal sealing layer and device for carrying out the process
DE3670519D1 (en) * 1985-01-21 1990-05-23 Kunz Alfred & Co METHOD AND DEVICE FOR SEALING EXISTING WASTE DEPOSITS OR CONTAMINATED AREAS.
WO1986007107A1 (en) * 1985-05-28 1986-12-04 Hans Richter Method and device for post-setting a liquid impervious layer in extended dumping grounds and contaminated areas in order to protect ground waters

Also Published As

Publication number Publication date
DK464289D0 (en) 1989-09-20
EP0360145A3 (en) 1991-02-27
DE58902883D1 (en) 1993-01-14
EP0360145A2 (en) 1990-03-28
DK464289A (en) 1990-03-22

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