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This lecture deals with the fundamentals of trenchless replacement of supply and disposal lines by means of gallery techniques (heading). |
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(Image: Overview of replacement methods in trenchless construction) |
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During gallery techniques or heading, the sewer or pipeline to be replaced is exposed, with the provision of a temporary protection, dismantled and replaced by a new one. The removal of the soil and the sewer or pipeline to be replaced is carried out manually with the aid of appropriate tools or machines e.g. excavators. Support arches of steel rods or special steel profiles that are placed into the gallery cross-section provide temporary support. … |
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The gallery techniques, or heading, requires the application of the following material, equipment and machinery:
(Image: Support arches (special steel profile) to protect the gallery) (Image: Steel shuttering) (Image: Converted mini-excavator with conveyor belt) (Image: Diffuser … |
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Support arches have increasingly been fabricated of steel since the beginning of the 20th century because steel permits a typing and prefabrication of these safety elements. Steel support arches are made of e.g. rolled sections, groove profiles, special mining profiles or combined profiles as closed arches or as arches that are open at the bottom [Maidl84c]. For a better or easier handling, the support arches can be produced in two or more separate … |
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The soil at the working face is excavated either manually by using auxiliary tools or automatically by means of machines. The loosened soil is removed by pushcarts, conveyor belts or wagons with or without rails depending on the size of the gallery. (Image: Converted mini-excavator with conveyor belt) (Image: Converted mini-excavator with conveyor belt) (Image: Rails with dump truck to remove the excavated soil and spoil) (Image: Dump truck for soil … |
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(Image: Fan for ingesting fresh air in the range of the starting pit) (Image: Pipelines for the distribution of fresh air) (Image: Diffuser fan for the distribution of fresh air) For the artificial ventilation, the following devices are applied:
During the gallery heading, special … |
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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 lecture deals with the different procedure steps of gallery techniques (heading) with steel and wood shuttering, from preparation to finished work. |
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The construction consists of the following:
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