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Priority to NO924331ApriorityCriticalpatent/NO924331D0/en
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For å tilveiebringe en ledning med adskilte ledningsføringer for forskjel-lige transportformål, så som av overvann og spillvann, anbringes i et varerør () et rør (3) og over dette et U-krununet rør (2) av formbar plast, som anbringes slik at det underliggende rør (3) ligger inne i krumningen. Det kan i tillegg i varerøret også være anbragt ytterligere ledninger for vann, samt kabler. Det er også beskrevet en fremgangsmåte til rehabilitering av rørledninger ved innlegging av minst to rør.In order to provide a pipe with separate pipe guides for different transport purposes, such as of surface water and waste water, a pipe (3) is placed in a commodity pipe () and above this a U-crowned pipe (2) of moldable plastic, which is arranged as that the underlying pipe (3) lies inside the curvature. In addition, additional pipes for water and cables can also be arranged in the product pipe. A method for rehabilitating pipelines by laying at least two pipes is also described.