EP0077898B1 - Methode for placing a conduit of pipes in the ground by pushing and pipe for use in such a method - Google Patents

Methode for placing a conduit of pipes in the ground by pushing and pipe for use in such a method Download PDF

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Publication number
EP0077898B1
EP0077898B1 EP82107657A EP82107657A EP0077898B1 EP 0077898 B1 EP0077898 B1 EP 0077898B1 EP 82107657 A EP82107657 A EP 82107657A EP 82107657 A EP82107657 A EP 82107657A EP 0077898 B1 EP0077898 B1 EP 0077898B1
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EP
European Patent Office
Prior art keywords
lining
pipe
pressing
sections
sealing strip
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Expired
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EP82107657A
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German (de)
French (fr)
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EP0077898A1 (en
Inventor
Heiner I. Hammer
Klaus Tornow
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Schlegel Lining Technology GmbH
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Schlegel Lining Technology GmbH
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Publication of EP0077898A1 publication Critical patent/EP0077898A1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
    • E21D11/385—Sealing means positioned between adjacent lining members
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/08—Casing joints
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

  • the invention relates to a method for laying a pipeline in the ground by pre-pressing a plurality of pipe pieces joined together with their ends, which have a thin, inner lining made of polymeric material such as polyethylene, which has a substantially axially extending end section at the joined pipe ends form mutually opposing liner end faces, and to establish a tight connection between these liner end faces.
  • the invention further relates to a pre-compression tube for carrying out this method, which has a jacket made of a load-bearing material such as concrete and, in comparison, a thin lining made of a polymeric material such as polyethylene, which has a lining end face at each tube end with a substantially axially extending end section forms.
  • pipe sections which consist of several pipe pieces joined together at their ends, are hydraulically pressed into a concavity which is simultaneously driven into the ground by means of a cutting head at the beginning of the pipe.
  • the compressive forces that occur are taken over by the load-bearing material of the pipe sections, usually concrete.
  • the lining which consists of a material that is soft in comparison with the load-bearing material, practically does not take part in the transfer of the pre-pressing forces.
  • the joined ends of adjacent pipe sections face each other with their end faces, the pre-pressing forces having to be transmitted between the end faces of the pipe part consisting of the supporting material.
  • a pressure compensation ring for example made of wood, is generally connected between these end faces.
  • an elastic ring can be inserted between the inner circumference of the sleeve and the outer circumference of the other pipe end located therein.
  • an inner lining to protect the pipes and a seal between adjacent pipe ends in addition to the elastic ring mentioned can be dispensed with (DE-U-1 939 089; GB-A-1 393 363).
  • the pipe ends in the area of the circumferential joint are each provided with inner steel linings which adjoin one another in the assembled state, are welded to one another and then covered on the inside with cement.
  • the invention requires those pipes which contain an inner polymeric lining which protects the supporting material from the corrosive attack of the medium to be expected in the pipeline. It is therefore necessary to connect the lining ends adjacent to one another at the joined ends of adjacent pipe sections in a sealed manner. It is known (German utility model 6 913 721) to accomplish this by welding the ends of the lining by means of extruder welding. This welding is carried out after laying the pipe and is cumbersome and time-consuming. Furthermore, this type of mutual tight connection of the lining of adjacent pipe sections precludes their use in areas in which qualified welding machines and welders are not available.
  • the invention is therefore based on the object of providing a method and a pre-compression tube of the type mentioned at the outset which enables a mutual tight connection of the tube linings with less effort.
  • the method according to the invention is characterized in that the end sections of each lining are thickened in comparison with their average thickness in the region between their end sections and in that an elastic sealing strip is inserted between the lining end faces of the joined pipe ends before the start of the pre-pressing and this by the pre-pressing force Generation of the sealing pressure compressed and then held in the compressed state by the pipe friction in the ground.
  • the pre-press tube according to the invention is characterized in that the end sections are thickened in comparison with the average thickness of the lining between the end sections.
  • the method according to the invention is extremely simple because the tight connection using pre-producible parts results automatically in one operation with the pre-pressing method.
  • the sealing quality is only dependent on the surface quality of the lining end faces, the surface quality of the sealing strips and the easy-to-calculate degree of compression of the sealing strip. With appropriate control and, if necessary, preparation of the interacting sealing surfaces, this results in a sealing reliability that can be easily calculated and guaranteed in advance.
  • the execution of the lining end sections with an increased thickness is functionally related to the process steps that ensure the sealing pressure, on the one hand a certain minimum size of the sealing surface in the form of the lining end face must be available in order to ensure adequate sealing security, and on the other hand the high sealing forces caused by this a corresponding resistance of the lining end ask for cuts. On the one hand, this resistance relates to the axially acting forces.
  • the axial compression of the lining end sections to be expected under the sealing forces must be so low that the sealing forces can be transmitted over a considerable axial length from the lining to the supporting tube part.
  • the thickness of the lining ensures that the compression of the lining material is kept low and a large circumferential surface is therefore available for the transmission of force.
  • the resistance of the lining end sections in the radial direction is just as important. If the lining in the end sections is as thin as in the rest of the lining area, it is to be feared that the lining bulges radially inwards under the sealing forces. As a result, the sealing pressure and thus the tightness are lost. On the other hand, the cohesion between the lining and the supporting tube part is destroyed. Damaging medium can penetrate from the inside of the pipe through the leak into the space between the partially detached lining and cause progressive detachment from there.
  • the thickening of the liner end sections has the advantage that the axial sealing forces can at least partially be transmitted axially at those interfaces between the liner and the supporting tube part at which the liner thickness decreases from the end sections to the normal thin dimension and which therefore have a radial directional component.
  • the use of the invention is particularly advantageous in connection with linings which are anchored to the supporting material by flexible projections, for example by pins, bristles, hair or loops which project from the lining and are anchored in the concrete.
  • This anchoring is expediently also in the area of the end sections.
  • At least one pipe end face can have a device for holding the elastic sealing strip, namely preferably an annular groove which interacts with a thickened cross-sectional part of the sealing strip.
  • the pipe ends are expediently provided with stop faces for maintaining a predetermined axial distance between the lining end faces.
  • the sealing surface can be machined in a manner suitable for improving the sealing effect. For example, it can be cut smoothly or grooved concentrically or corrugated.
  • a wooden ring 5 is inserted between the pipe end faces 4 'in order to transmit the pressing forces.
  • a steel ring 6 is arranged to form a protruding collar at the pipe end 1. It encompasses the tapered area 7 of the pipe end 2, including a rolling seal 8. As a result, the pipe ends are centered against one another and sealed against water from the outside.
  • the pipe linings 4 are thickened in the end regions at 12, so that they form sealing surfaces 13 in the pipe end faces 4 ', which cooperate with the sealing part 11 of the sealing strip.
  • the thickened parts 12 of the pipe linings are connected to the concrete part of the pipe walls in the same way as the lining in their normal thin area 4. However, this is not absolutely necessary in every case. Rather, it depends on the type of power transmission from the thickened lining part 12 to the concrete part of the wall. Forces must be transmitted, which are transmitted to the thickened lining part 12 by the compression of the sealing part 11 of the sealing strip as axial compressive forces.
  • the connection devices 15 projections, monofilaments, etc.
  • the axial projection of the annular surface 16 are available for power transmission.
  • the force transmission capacity over the devices 15 along the outer cylindrical surface of the thickened part 12 of the liner depends on the type of the connecting devices and the axial length of this surface. The less the end face 16 appears to be suitable for power transmission, the greater the axial length of the thickened lining part must be made and the less the flexibility of the connecting devices 15 must be.
  • the axial length of the thickened part 12 of the lining can be made small and the strength of the connecting devices 15 in this thickened lining region is less important, the larger and steeper the thickness jump between the regions 4 and 12 of the lining.
  • a thickened lining part of 30 mm thickness and 80 mm length has proven itself, the angle between the ring surface 16 and the axial direction was about 25 °.
  • the thickened lining part can be regarded as practically rigid with respect to the compression forces acting on the sealing strip.
  • the fastening devices 15 can optionally be dispensed with if the interface between this thickened part and the concrete part of the pipe - as indicated by dash-dotted lines at 17 - is designed such that a change in the position of the thickened part under the long-term effect of the sealing pressure is not to be expected, namely for example in the indicated undercut shape of the interface.
  • the sealing strip can be shaped such that the highest sealing pressure is developed in the area of the sealing surfaces 13. This is achieved, for example, in that the area of the sealing strip to be located between these sealing surfaces is made somewhat thicker in comparison with the remaining part 11.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Joints With Sleeves (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Verlegen einer Rohrleitung im Erdreich durch Vorpressen einer Mehrzahl von mit ihren Enden zusammengefügten Rohrstücken, die eine dünne, innenseitige Auskleidung aus polymerem Werkstoff wie Polyethylen aufweisen, die mit einem sich im wesentlichen axial erstrekkenden Endabschnitt an den zusammengefügten Rohrenden einander mit Abstand gegenüberstehende Auskleidungsstirnflächen bilden, und zum Herstellen einer dichten Verbindung zwischen diesen Auskleidungsstirnflächen. Die Erfindung bezieht sich ferner auf ein Vorpreßrohr zur Durchführung dieses Verfahrens, das einen Mantel aus tragendem Werkstoff wie Beton und eine im Vergleich damit dünne Auskleidung aus einem polymeren Werkstoff wie Polyethylen aufweist, der mit einem sich im wesentlichen axial erstreckenden Endabschnitt an jedem Rohrende eine Auskleidungsstirnfläche bildet.The invention relates to a method for laying a pipeline in the ground by pre-pressing a plurality of pipe pieces joined together with their ends, which have a thin, inner lining made of polymeric material such as polyethylene, which has a substantially axially extending end section at the joined pipe ends form mutually opposing liner end faces, and to establish a tight connection between these liner end faces. The invention further relates to a pre-compression tube for carrying out this method, which has a jacket made of a load-bearing material such as concrete and, in comparison, a thin lining made of a polymeric material such as polyethylene, which has a lining end face at each tube end with a substantially axially extending end section forms.

Beim Vorpreßverfahren werden Rohrleitungsabschnitte, die aus mehreren, mit ihren Enden zusammengefügten Rohrstücken bestehen, hydraulisch in eine gleichzeitig mittels eines Schneidkopfs am Beginn der Rohrleitung ins Erdreich vorgetriebene Höhlung eingepreßt. Die dabei auftretenden Preßkräfte werden von dem tragenden Werkstoff der Rohrabschnitte, meistens Beton, übernommen. Die Auskleidung, die aus einem im Vergleich mit dem tragenden Werkstoff weichen Material besteht, nimmt an der Übernahme der Vorpreßkräfte praktisch nicht teil. Die zusammengefügten Enden benachbarter Rohrstücke stehen einander mit ihren Stirnflächen gegenüber, wobei die Vorpreßkräfte zwischen den Stirnflächen des aus dem tragenden Werkstoff bestehenden Rohrteils übertragen werden müssen. Zwischen diese Stirnflächen ist im allgemeinen ein Druckausgleichsring, beispielsweise aus Holz, eingeschaltet. Zur Aufrechterhaltung der Fügestellung der Rohrenden kann eines mit einer Stahlmanschette versehen sein, die das andere Rohrende umfaßt. Als Schutz gegen das Eindringen äußerer Verschmutzungen und zum Zweck des Druckausgleichs kann zwischen den Innenumfang der Manschette und den darin befindlichen Außenumfang des anderen Rohrendes ein elastischer Ring eingeschaltet sein.In the pre-pressing process, pipe sections, which consist of several pipe pieces joined together at their ends, are hydraulically pressed into a concavity which is simultaneously driven into the ground by means of a cutting head at the beginning of the pipe. The compressive forces that occur are taken over by the load-bearing material of the pipe sections, usually concrete. The lining, which consists of a material that is soft in comparison with the load-bearing material, practically does not take part in the transfer of the pre-pressing forces. The joined ends of adjacent pipe sections face each other with their end faces, the pre-pressing forces having to be transmitted between the end faces of the pipe part consisting of the supporting material. A pressure compensation ring, for example made of wood, is generally connected between these end faces. In order to maintain the joining position of the pipe ends, one can be provided with a steel sleeve which encompasses the other pipe end. To protect against the penetration of external dirt and for the purpose of pressure equalization, an elastic ring can be inserted between the inner circumference of the sleeve and the outer circumference of the other pipe end located therein.

In manchen Fällen kann auf eine innere Auskleidung zum Schutz der Rohre sowie auf eine Abdichtung zwischen benachbarten Rohrenden zusätzlich zu dem erwähnten elastischen Ring verzichtet werden (DE-U-1 939 089; GB-A-1 393 363). In einem anderen bekannten Fall (FR-A-2 365 073) sind die Rohrenden im Bereich der Umfangsfuge jeweils mit inneren Stahlauskleidungen versehen, die im montierten Zustand aneinander grenzen, miteinander verschweißt werden und anschließend innenseitig mit Zement abgedeckt werden.In some cases, an inner lining to protect the pipes and a seal between adjacent pipe ends in addition to the elastic ring mentioned can be dispensed with (DE-U-1 939 089; GB-A-1 393 363). In another known case (FR-A-2 365 073), the pipe ends in the area of the circumferential joint are each provided with inner steel linings which adjoin one another in the assembled state, are welded to one another and then covered on the inside with cement.

Die Erfindung setzt jedoch solche Rohr voraus, die eine innere polymere Auskleidung enthalten, die den tragenden Werkstoff vor dem korrosiven Angriff des in der Rohrleitung zu erwartenden Mediums schützt. Deshalb ist es erforderlich, die an den zusammengefügten Enden benachbarter Rohrabschnitte benachbarten Auskleidungsenden dicht miteinander zu verbinden. Es ist bekannt (deutsches Gebrauchsmuster 6 913 721) dies durch Verschweißung der Auskleidungsenden mittels Extruderverschweißung zu bewerkstelligen. Diese Verschweißung wird nach der Verlegung des Rohrs vorgenommen und ist umständlich und aufwendig. Ferner schließt diese Art der gegenseitigen dichten Verbindung der Auskleidung benachbarter Rohrstücke deren Anwendung in solchen Bereichen aus, in denen qualifizierte Schweißgeräte und Schweißer nicht zur Verfügung stehen.However, the invention requires those pipes which contain an inner polymeric lining which protects the supporting material from the corrosive attack of the medium to be expected in the pipeline. It is therefore necessary to connect the lining ends adjacent to one another at the joined ends of adjacent pipe sections in a sealed manner. It is known (German utility model 6 913 721) to accomplish this by welding the ends of the lining by means of extruder welding. This welding is carried out after laying the pipe and is cumbersome and time-consuming. Furthermore, this type of mutual tight connection of the lining of adjacent pipe sections precludes their use in areas in which qualified welding machines and welders are not available.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und ein Vorpreßrohr der eingangs genannten Art zu schaffen, das eine gegenseitige dichte Verbindung der Rohrauskleidungen mit geringerem Aufwand ermöglicht.The invention is therefore based on the object of providing a method and a pre-compression tube of the type mentioned at the outset which enables a mutual tight connection of the tube linings with less effort.

Das erfindungsgemäße Verfahren zeichnet sich dadurch aus, das die Endabschnitte jeder Auskleidung verdickt sind im Vergleich mit ihrer durchschnittlichen Dicke im Bereich zwischen ihren Endabschnitten und daß zwischen die Auskleidungsstirnflächen der zusammengefügten Rohrenden vor dem Beginn des Vorpressens ein elastischer Dichtstreifen eingelegt wird und dieser durch die Vorpreßkraft zur Erzeugung der Dichtpressung zusammengedrückt und anschließend durch die Rohrreibung im Erdreich im zusammengedrückten Zustand gehalten wird.The method according to the invention is characterized in that the end sections of each lining are thickened in comparison with their average thickness in the region between their end sections and in that an elastic sealing strip is inserted between the lining end faces of the joined pipe ends before the start of the pre-pressing and this by the pre-pressing force Generation of the sealing pressure compressed and then held in the compressed state by the pipe friction in the ground.

Das erfindungsgemäße Vorpreßrohr zeichnet sich dadurch aus, daß die Endabschnitte im Vergleich mit der durchschnittlichen Dicke der Auskleidung zwischen den Endabschnitten verdickt ausgeführt sind.The pre-press tube according to the invention is characterized in that the end sections are thickened in comparison with the average thickness of the lining between the end sections.

Das erfindungsgemäße Verfahren ist äußerst einfach, weil sich die dichte Verbindung unter Verwendung vorproduzierbarer Teile in einem Arbeitsgang mit dem Vorpreßverfahren selbsttätig ergibt. Die Dichtqualität ist nur abhängig von der Oberflächenqualität der Auskleidungsstirnflächen der Oberflächenqualität der Dichtstreifen und dem leicht zu errechnenden Grad der Zusammenpressung des Dichtstreifens. Bei entsprechender Kontrolle und ggf. Vorbereitung der zusammenwirkenden Dichtflächen ergibt sich daher eine im voraus ohne weiteres kalkulierbare und gewährleistbare Dichtsicherheit.The method according to the invention is extremely simple because the tight connection using pre-producible parts results automatically in one operation with the pre-pressing method. The sealing quality is only dependent on the surface quality of the lining end faces, the surface quality of the sealing strips and the easy-to-calculate degree of compression of the sealing strip. With appropriate control and, if necessary, preparation of the interacting sealing surfaces, this results in a sealing reliability that can be easily calculated and guaranteed in advance.

Die Ausführung der Auskleidungsendabschnitte mit vergrößerter Dicke steht insofern mit den die Dichtpressung gewährleistenden Verfahrensschritten in einem funktionellen Zusammenhang als einerseits eine gewisse Mindestgröße der Dichtfläche in Gestalt der Auskleidungsstirnfläche zur Verfügung stehen muß, um eine hinreichende Dichtsicherheit zu gewährleisten, und weil andererseits die dadurch bedingten hohen Dichtkräfte eine entsprechende Widerstandsfähigkeit der Auskleidungsendabschnitte verlangen. Diese Widerstandsfähigkeit bezieht sich einerseits auf die axial wirkenden Kräfte. Die unter den Dichtkräften zu erwartende axiale Kompression der Auskleidungsendabschnitte muß so gering sein, daß die Dichtkräfte auf einer beträchtlichen axialen Länge von der Auskleidung auf den tragenden Rohrteil übertragen werden können. Die Dicke der Auskleidung sorgt dafür, daß die Kompression des Auskleidungswerkstoffs gering gehalten wird und somit eine große Umfangsfläche zur Kraftübertragung zur Verfügung steht. - Ebenso wichtig ist andererseits die Widerstandsfähigkeit der Auskleidungsendabschnitte in radialer Richtung. Wenn die Auskleidung in den Endabschnitten so dünn ist wie im übrigen Auskleidungsbereich, so ist zu befürchten, daß die Auskleidung sich unter den Dichtkräften radial nach innen ausbeult. Dadurch geht einerseits die Dichtpressung und damit die Dichtheit verloren. Andererseits wird dadurch der Zusammenhalt zwischen der Auskleidung und dem tragenden Rohrteil zerstört. Schädigendes Medium kann aus dem Rohrinneren durch die undichte Stelle in den Zwischenraum zwischen die teilweise abgelöste Auskleidung dringen und von dort aus eine fortschreitende Ablösung bewirken. - Schließlich hat die Verdikkung der Auskleidungsendabschnitte den Vorteil, daß die axialen Dichtkräfte zumindest teilweise an denjenigen Grenzflächen zwischen Auskleidung und tragendem Rohrteil axial übertragen werden können, an denen die Auskleidungsdicke von den Endabschnitten auf das normale dünne Maß zurückgeht und die daher eine radiale Richtungskomponente aufweisen.The execution of the lining end sections with an increased thickness is functionally related to the process steps that ensure the sealing pressure, on the one hand a certain minimum size of the sealing surface in the form of the lining end face must be available in order to ensure adequate sealing security, and on the other hand the high sealing forces caused by this a corresponding resistance of the lining end ask for cuts. On the one hand, this resistance relates to the axially acting forces. The axial compression of the lining end sections to be expected under the sealing forces must be so low that the sealing forces can be transmitted over a considerable axial length from the lining to the supporting tube part. The thickness of the lining ensures that the compression of the lining material is kept low and a large circumferential surface is therefore available for the transmission of force. - On the other hand, the resistance of the lining end sections in the radial direction is just as important. If the lining in the end sections is as thin as in the rest of the lining area, it is to be feared that the lining bulges radially inwards under the sealing forces. As a result, the sealing pressure and thus the tightness are lost. On the other hand, the cohesion between the lining and the supporting tube part is destroyed. Damaging medium can penetrate from the inside of the pipe through the leak into the space between the partially detached lining and cause progressive detachment from there. - Finally, the thickening of the liner end sections has the advantage that the axial sealing forces can at least partially be transmitted axially at those interfaces between the liner and the supporting tube part at which the liner thickness decreases from the end sections to the normal thin dimension and which therefore have a radial directional component.

Besonders vorteilhaft ist die Anwendung der Erfindung im Zusammenhang mit solchen Auskleidungen, die durch nachgiebige Vorsprünge am tragenden Werkstoff verankert sind, beispielsweise durch Stifte, Borsten, Haare oder Schlaufen, die von der Auskleidung vorspringen und im Beton verankert sind. Diese Verankerung befindet sich zweckmäßigerweise auch im Bereich der Endabschnitte.The use of the invention is particularly advantageous in connection with linings which are anchored to the supporting material by flexible projections, for example by pins, bristles, hair or loops which project from the lining and are anchored in the concrete. This anchoring is expediently also in the area of the end sections.

Nach einem weiteren Merkmal der Erfindung kann wenigstens eine Rohrstirnfläche eine Einrichtung zum Halten des elastischen Dichtstreifens aufweisen, nämlich vorzugsweise eine Ringnut, die mit einem verdickten Querschnittsteil des Dichtstreifens zusammenwirkt.According to a further feature of the invention, at least one pipe end face can have a device for holding the elastic sealing strip, namely preferably an annular groove which interacts with a thickened cross-sectional part of the sealing strip.

Damit der Dichtstreifen nicht durch die Vorpreßkraft beschädigt werden kann und mit einer vorbestimmten Zusammendrückung gerechnet werden kann, sind die Rohrenden zweckmäßigerweise mit Anschlagflächen zur Einhaltung eines vorbestimmten Axialabstandes der Auskleidungsstirnflächen versehen.So that the sealing strip cannot be damaged by the pre-pressing force and a predetermined compression can be expected, the pipe ends are expediently provided with stop faces for maintaining a predetermined axial distance between the lining end faces.

Die Erfindung wird im folgenden näher unter Bezugnahme auf die Zeichnung erläutert, die ein vorteilhaftes Ausführungsbeispiel veranschaulicht. In einer Figur ist ein Teilschnitt durch den Stoßbereich zweier Rohrstücke in einer axial und radial verlaufenden Schnittebene dargestellt.The invention is explained in more detail below with reference to the drawing, which illustrates an advantageous embodiment. In one figure, a partial section through the butt region of two pipe sections is shown in an axially and radially extending sectional plane.

Die Dichtfläche kann in einer zur Verbesserung der Dichtwirkung geeigneten Weise bearbeitet sein. Sie kann beispielsweise glatt geschnitten oder konzentrisch genutet oder geriefelt sein.The sealing surface can be machined in a manner suitable for improving the sealing effect. For example, it can be cut smoothly or grooved concentrically or corrugated.

Die Erfindung wird im folgenden näher unter Bezugnahme auf die Zeichnung erläutert, die in einer Figur einen Radialschnitt durch den Stoßbereich zweier Rohrstücke darstellt.The invention is explained in more detail below with reference to the drawing, which in a figure represents a radial section through the joint region of two pipe sections.

Es handelt sich um Rohre großen Durchmessers und großer Wanddicke, beispielsweise für Abwassersammler mit einem lichten Durchmesser von einigen Metern und einer Wanddicke von beispielsweise 20 bis 50 cm. Die Darstellung ist also etwas verkleinert. Man erkennt die einander benachbarten Enden 1 und 2 zweier Rohrstücke, deren Wand jeweils überwiegend aus Beton 3 besteht und an der Innenfläche eine Auskleidung 4 aus polymerem Werkstoff wie beispielsweise Polyethylen oder Polypropylen besitzt, die fest mit dem Beton verbunden ist, und zwar vorzugsweise durch die Mittel, die in den eingangs genannten Schriften offenbart sind. Die Rohre sind zur Verlegung im Vorpreßverfahren bestimmt, bei welchem Rohrschüsse beträchtlicher Länge, die aus einer Vielzahl von einzelnen Rohrstücken bestehen, hydraulisch im Erdreich in einem gleichzeitig durch Schildvortrieb geschaffenen Tunnel vorgeschoben werden. Zwischen die Rohrstirnflächen 4' ist zur Übertragung der Preßkräfte ein Holzring 5 eingelegt. Ein Stahlring 6 ist zur Bildung eines überstehenden Kragens am Rohrende 1 angeordnet. Er umfaßt den verjüngten Bereich 7 des Rohrendes 2 unter Einschluß einer Rolldichtung 8. Dadurch werden die Rohrenden gegeneinander zentriert und gegen von außen anstehendes Wasser abgedichtet.These are pipes of large diameter and large wall thickness, for example for waste water collectors with a clear diameter of a few meters and a wall thickness of, for example, 20 to 50 cm. The display is therefore somewhat reduced. One recognizes the mutually adjacent ends 1 and 2 of two pieces of pipe, the wall of which consists predominantly of concrete 3 and on the inner surface has a lining 4 made of polymeric material such as polyethylene or polypropylene, which is firmly connected to the concrete, preferably through the Means that are disclosed in the writings mentioned. The pipes are intended for laying in the pre-pressing process, in which pipe sections of considerable length, which consist of a large number of individual pipe pieces, are hydraulically advanced in the ground in a tunnel created simultaneously by shield driving. A wooden ring 5 is inserted between the pipe end faces 4 'in order to transmit the pressing forces. A steel ring 6 is arranged to form a protruding collar at the pipe end 1. It encompasses the tapered area 7 of the pipe end 2, including a rolling seal 8. As a result, the pipe ends are centered against one another and sealed against water from the outside.

Die Rohrstirnflächen 4' enthalten je eine Nut 9 in mäßigem Abstand von der Rohrinnenfläche zur Aufnahme des verdickten Teils 10 eines ringförmigen Dichtstreifens, dessen Dichtteile 11 zwischen demjenigen Bereich der Rohrstirnfläche 4' liegen, die radial innerhalb der Nuten 9 liegen.The tube end faces 4 'each contain a groove 9 at a moderate distance from the tube inner surface for receiving the thickened part 10 of an annular sealing strip, the sealing parts 11 of which lie between that region of the tube end face 4' which lies radially within the grooves 9.

Die Rohrauskleidungen 4 sind in den Endbereichen bei 12 verdickt, so daß sie in den Rohrstirnflächen 4' Dichtungsflächen 13 bilden, die mit dem Dichtteil 11 des Dichtstreifens zusammenwirken. Im dargestellten Beispiel sind die verdickten Teile 12 der Rohrauskleidungen in derselben Weise mit dem Betonteil der Rohrwandungen verbunden wie die Auskleidung in ihrem normal dünnen Bereich 4. Dies ist jedoch nicht in jedem Fall unbedingt erforderlich. Es kommt vielmehr an auf die Art der Kraftübertragung von dem verdickten Auskleidungsteil 12 auf den Betonteil der Wand. Übertragen werden müssen Kräfte, die durch die Kompression des Dichtteils 11 des Dichtungsstreifens als axiale Druckkräfte auf den verdickten Auskleidungsteil 12 übertragen werden. Zur Kraftübertragung stehen einerseits die Verbindungseinrichtungen 15 (Vorsprünge, Monofilamente etc.) und andererseits die axiale Projektion der Ringfläche 16 zur Verfügung. Je größer der Dickenunterschied zwischen den Teilen 4 und 12 der Auskleidung ist, um so größer ist auch die radiale Erstreckung der Ringfläche 16 und damit deren Vermögen, die Dichtungskräfte zu übertragen. Andererseits ist dieses Vermögen um so geringer, je kleiner der Winkel zwischen dieser Fläche und der Axialrichtung ist. Das Kraftübertragungsvermögen über die Einrichtungen 15 entlang der äußeren Zylinderfläche des verdickten Teils 12 der Auskleidung hängt von der Art der Verbindungseinrichtungen und der axialen Länge dieser Fläche ab. Je weniger die Stirnfläche 16 zur Kraftübertragung geeignet erscheint, um so größer muß die axiale Länge des verdickten Auskleidungsteils gemacht werden und um so geringer muß die Nachgiebigkeit der Verbindungseinrichtungen 15 sein. Umgekehrt kann die axiale Länge des verdickten Teils 12 der Auskleidung gering bemessen werden und kommt es weniger auf die Festigkeit der Verbindungseinrichtungen 15 in diesem verdickten Auskleidungsbereich an, je größer und steiler der Dickensprung zwischen den Bereichen 4 und 12 der Auskleidung ist. Praktisch bewährt hat sich beispielsweise bei der Verwendung von Polypropylen als Auskleidungsmaterial und Polyethylen als Material der die Verbindungseinrichtungen 15 bildenden Monofilamente sowie bei einer normalen Dicke der Auskleidung von 3 mm ein verdickter Auskleidungsteil von 30 mm Dicke und 80 mm Länge, wobei der Winkel zwischen der Ringfläche 16 und der Axialrichtung bei etwa 25° lag. Unter diesen Verhältnissen kann der verdickte Auskleidungsteil gegenüber den am Dichtungsstreifen wirkenden Kompressionskräften als praktisch starr betrachtet werden. Beim Zusammenschieben der Rohrstücke im Verlegeverfahren wird der Dichtungsstreifen zur Erzeugung einer hinreichenden Dichtpressung komprimiert. Tritt er dabei - wie bei 14 angedeutet - nach innen über die Rohrinnenfläche hinaus, so kann der überstehende Teil weggeschnitten werden.The pipe linings 4 are thickened in the end regions at 12, so that they form sealing surfaces 13 in the pipe end faces 4 ', which cooperate with the sealing part 11 of the sealing strip. In the example shown, the thickened parts 12 of the pipe linings are connected to the concrete part of the pipe walls in the same way as the lining in their normal thin area 4. However, this is not absolutely necessary in every case. Rather, it depends on the type of power transmission from the thickened lining part 12 to the concrete part of the wall. Forces must be transmitted, which are transmitted to the thickened lining part 12 by the compression of the sealing part 11 of the sealing strip as axial compressive forces. The connection devices 15 (projections, monofilaments, etc.) and the axial projection of the annular surface 16 are available for power transmission. The greater the difference in thickness between parts 4 and 12 of the lining, the greater the radial extent the annular surface 16 and thus their ability to transmit the sealing forces. On the other hand, the smaller the angle between this surface and the axial direction, the smaller this capacity. The force transmission capacity over the devices 15 along the outer cylindrical surface of the thickened part 12 of the liner depends on the type of the connecting devices and the axial length of this surface. The less the end face 16 appears to be suitable for power transmission, the greater the axial length of the thickened lining part must be made and the less the flexibility of the connecting devices 15 must be. Conversely, the axial length of the thickened part 12 of the lining can be made small and the strength of the connecting devices 15 in this thickened lining region is less important, the larger and steeper the thickness jump between the regions 4 and 12 of the lining. For example, when using polypropylene as the lining material and polyethylene as the material of the monofilaments forming the connecting devices 15 and with a normal thickness of the lining of 3 mm, a thickened lining part of 30 mm thickness and 80 mm length has proven itself, the angle between the ring surface 16 and the axial direction was about 25 °. Under these conditions, the thickened lining part can be regarded as practically rigid with respect to the compression forces acting on the sealing strip. When the pipe sections are pushed together in the laying process, the sealing strip is compressed to produce a sufficient sealing pressure. If he steps inwards - as indicated at 14 - beyond the inner surface of the pipe, the protruding part can be cut away.

Auf die Befestigungseinrichtungen 15 kann ggf. verzichtet werden, wenn die Grenzfläche zwischen diesem verdickten Teil und dem Betonteil des Rohres - wie bei 17 strichpunktiert angedeutet - so ausgebildet ist, daß eine Lageveränderung des verdickten Teils unter der Langzeitwirkung der Dichtpressung nicht zu erwarten ist, nämlich beispielsweise bei der angedeuteten hinterschnittenen Gestalt der Grenzfläche.The fastening devices 15 can optionally be dispensed with if the interface between this thickened part and the concrete part of the pipe - as indicated by dash-dotted lines at 17 - is designed such that a change in the position of the thickened part under the long-term effect of the sealing pressure is not to be expected, namely for example in the indicated undercut shape of the interface.

Der Dichtungsstreifen kann so geformt sein, daß die höchste Dichtpressung im Bereich der Dichtflächen 13 entwickelt wird. Dies gelingt beispielsweise dadurch, daß der zwischen diesen Dichtflächen zu liegen bestimmte Bereich des Dichtstreifens etwas dicker im Vergleich mit dem übrigen Teil 11 ausgeführt wird.The sealing strip can be shaped such that the highest sealing pressure is developed in the area of the sealing surfaces 13. This is achieved, for example, in that the area of the sealing strip to be located between these sealing surfaces is made somewhat thicker in comparison with the remaining part 11.

Claims (6)

1. Process for laying a pipeline in the ground by forward-pressing of a plurality of pipe sections assembled end to end and having a thin internal lining of a polymeric material such as polyethylene, which sections form, by means of an essentially axial end portion at the assembled pipe ends, opposite and spaced-apart lining end faces, and for producing a tight connection between these lining end faces, characterised in that the end portion (12) of each lining (4) is thickened relative to the average thickness of the lining in the zone between the end portions (12), and that between the lining end faces (13) of the assembled pipe ends there is inserted, before the start of the forward-pressing, an elastic sealing strip (11) which strip is compressed, by the forward-pressing force, so as to cause it to be pressed into a leaktight state, and is subsequently kept in the compressed state by the pipe friction in the ground.
2. Forward-pressing pipe for performing the process according to claim 1, which pipe possesses a jacket (3) of a load-bearing material such as concrete and a thin lining (4) of a polymeric material such as polyethylene, which lining forms, by means of an essentially axial end portion (12) at each pipe end, a lining end face (13), characterised in that the end sections (12) are thickened compared to the average thickness to the lining between the end sections.
3. Forward-pressing pipe according to claim 2, characterised in that the lining (4) is also anchored to the load-bearing material (3) in the zone of the end portions (12) by yielding projections (15).
4. Forward-pressing pipe according to claim 2 or 3, characterised in that at least one pipe end face (4') has a device (9) for holding an elastic sealing strip (10, 11) in cooperation with the sealing face (13).
5. Forward-pressing pipe according to claim 4, characterised in that the device for holding an elastic sealing strip (10, 11) is formed by an annular groove (9) cooperating with a thickened portion (10) of the sealing strip.
6. Forward-pressing pipe according to one of claims 2 to 5, characterised in that the pipe ends have stop faces (4') for maintaining a predetermined axial distance of the lining end face (13).
EP82107657A 1981-10-23 1982-08-21 Methode for placing a conduit of pipes in the ground by pushing and pipe for use in such a method Expired EP0077898B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813142177 DE3142177A1 (en) 1981-10-23 1981-10-23 "CONCRETE PIPE WITH A POLYMER LINING"
DE3142177 1981-10-23

Publications (2)

Publication Number Publication Date
EP0077898A1 EP0077898A1 (en) 1983-05-04
EP0077898B1 true EP0077898B1 (en) 1985-07-31

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EP82107657A Expired EP0077898B1 (en) 1981-10-23 1982-08-21 Methode for placing a conduit of pipes in the ground by pushing and pipe for use in such a method

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US (1) US4552485A (en)
EP (1) EP0077898B1 (en)
JP (1) JPS58180894A (en)
DE (2) DE3142177A1 (en)

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Also Published As

Publication number Publication date
DE3142177A1 (en) 1983-05-11
EP0077898A1 (en) 1983-05-04
JPS58180894A (en) 1983-10-22
US4552485A (en) 1985-11-12
DE3265079D1 (en) 1985-09-05

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