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(Table: Material restrictions for gallery techniques (heading)) |
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(Table: Material restrictions for gallery techniques (heading)) |
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(Image: Documentation) Parallel to the ongoing construction measurement of the gallery, geotechnical measurements should be carried out before and during the construction process in order to confirm the positional stability of the gallery during the heading process. This is needed to detect potential ground deformations and to determine the effects on adjacent buildings. Surface levelings are suited for measurement methods to detect advancing or trailing … |
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(Image: Documentation) For the verification of the quality assurance of the applied materials and accomplished works, a QA-manual should be established by the contractor. The QA-manual should contain the following indications and verifications:
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Advantages of gallery techniques (heading):
Disadvantages of gallery techniques (heading):
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Congratulations! You have successfully finished this lesson. Next you will have the opportunity to review the newly acquired knowledge with an interactive questionnaire. You can of course still navigate back to any point in the lessons if you wish to review a specific point or subject. Stay curious! |
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Nov 04, 2016 This module focuses on the fundamentals of the trenchless replacement of gas, water, wastewater pipelines using the gallery techniques known from the mining industry. In addition, the individual steps of the gallery heading process with steel and timber support are described - from the preparatory measures to the final work. In addition, the areas of application and limitations of gallery heading, the measures for quality assurance as well as the advantages and disadvantages of this method are presented. After completing this module, you will have a sound knowledge of:
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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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Nov 04, 2016 AE-08 Replacement: Pipe Extraction Method Classification of Replacement Methods in Main Process Groups
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Nov 04, 2016 AE-08 Replacement: Pipe Extraction Method Classification of Replacement Methods in Main Process Groups (Image: Overview of replacement methods in trenchless construction) |
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Nov 04, 2016 AE-08 Replacement: Pipe Extraction Method Classification of Replacement Methods in Main Process Groups The pipe extraction - also called the pushing/pulling process - is a method for the trenchless replacement of existing pipelines. A characteristic of this process is the sectional pulling in of new product pipe and the simultaneous pushing out of the old pipe, with the aid of hydraulic pulling-equipment placed in the reception pit. During this process, the pipe to be replaced is completely removed out of the subsoil. (Image: Pushing-pulling process … |
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Nov 04, 2016 AE-08 Replacement: Pipe Extraction Method Classification of Replacement Methods in Main Process Groups Pipe Extraction The original pipe is extracted by pulling or pushing and is simultaneously replaced by a new one. When the diameter of the new pipe is significantly larger than the old one, an expander is used [DINEN12889:2000]. |
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The following guidelines can be references for pipe extraction:
In addition, the following European standards can also serve as a good guideline for pipe extraction process:
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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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