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May 27, 2019 This lesson focuses on the trenchless replacement of pipelines using the pipe extraction method. The aim is to provide a quick introduction to the subject with regard to process variations and operating limits and limits, as well as to convey the advantages and disadvantages of this replacement process. |
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May 27, 2019
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May 27, 2019 (Image: Overview of replacement methods in trenchless construction) |
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May 27, 2019 The pipe extraction - also called the pushing/pulling process - is a method for the trenchless replacement of existing pipelines. A characteristic of this process group is the sectional pulling-in of the new product pipeline and the simultaneous pushing-out of the old pipeline with the aid of hydraulic pulling-equipment situated in the reception pit. During this process, the pipeline to be replaced is completely removed out of the subsoil. (Image: Pushing-… |
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May 27, 2019 |
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DIN EN 12889 Pipe Extraction The original pipeline is extracted by pulling or pushing and simultaneously replaced by a new one. When the diameter of the new pipe is significantly larger than the old, an expander is used [DINEN12889:2000]. |
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May 27, 2019 |
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European Standards: DIN EN 752-5: Drain and sewer systems outside buildings (04.2008) DIN EN 12889: Trenchless construction and testing of drains and sewers (03.2000) |
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May 27, 2019 |
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(Image: Overview over pipe extraction processes) |
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Preparatory work contains: (Image: Inspection) Acquisition of the actual condition of the pipeline to be replaced (pipe diameter, material, depth of cover, directional changes, branches and connections, fittings, clamps, etc.) (Image: Laterals) Removal of obstacles (change of nominal size, directional changes, branches and connections, fittings, clamps, etc.) (Image: Planning) Acquisition of the line's geometry |
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(Image: Pipe extraction with splitter cone - Replacement of cast iron pipelines [FI-Weiss]) |
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(Image: Pipe extraction for the replacement of cast iron pipelines (Hydros System) [FI-Klug] - Adapter) (Image: Pipe extraction for the replacement of cast iron pipelines (Hydros System) [ATVA127a] - Splitter cone) |
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If an intermediate pit is installed, a splitter cone and a container for pipe fragments are integrated. The discrete pipe sections are continually pulled by the pulling-equipment in the reception pit over the splitter cone, placed in the particular intermediate pit, and destroyed one after the other. (Image: Hydros®-PLUS process - Splitter cone in the intermediate pit [FI-Weiss]) (Image: Hydros®-PLUS process - Destroyed pipeline (grey cast iron pipe … |
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This special technique is used to remove existing lead pipelines out of the soil through axial pulling and subsequent pulling-in of a casing pipe. In order to prevent the breaking of the old pipeline, a special form-fitting tube is inserted through its entire length in order to evenly distribute the necessary tensile force. Pipe extraction with a pulling tube is carried out in four steps. (Image: Hydros®-LEAD process for the replacement of service … |
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