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(Image: Pipe extraction based on pipe splitting - Working steps) |
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The pipe extraction with auxiliary pipes is a modification of the pipe extraction method based on pipe splitting. It is a non-destructive technique for the removal of pipelines from the subsoil. In the first step, the pipeline to be replaced is pressed out of the subsoil by means of recoverable, pressure-resistant steel pipes (so-called "casings"). For this purpose, the pushing- and pulling-equipment is installed in the reception pit, which presses … |
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(Table: Overview of the different pipe extraction variants) |
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(Image: Overview of different pipe extraction processes) |
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May 27, 2019 |
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Preconditions for the application of pipe extraction:
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May 27, 2019 |
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May 27, 2019 |
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May 27, 2019 Advantages of pipe extraction compared to the open cut method:
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May 27, 2019 This module deals with the trenchless replacement of gas, water, wastewater pipelines by means of the pipe extraction method. The pipe extraction methods with split cone, pull hose, auxiliary pipe, and based on the split and cut method are presented. After completing this module, you will have knowledge of:
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May 27, 2019 The excavation of utility trenches and their safe construction belong to the field of geotechnology. In geotechnology, the soil (or rock) forms the subsoil and serves as construction material. It can also act as a load or form the load-bearing and stabilising material. In other words, geotechnology deals with the requirements that have to be given in order to use the soil (or rock) in the form of stable and functional civil engineering structures [… |
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May 27, 2019 To the field of Geotechnology belong, amongst others, the following scientific disciplines:
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May 27, 2019 Owing to its varying behaviour when loaded by structures, [EN1997-1:2009] classifies the subsoil into undisturbed and disturbed soil (subsequently altogether called soil) as well as rock (solid rock), while [[ASTM D2487-06]] just distinguishes between the various types of soil (gravels, sands, silts, clays, and organic soils). In practice, however, a distinction between undisturbed and disturbed soil is not made. Consequently, all loose material is … |
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May 27, 2019 The following will look at soil characteristics in greater detail. |
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May 27, 2019
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May 27, 2019 Soil is called backfill, if “it has been artificially placed”. Backfill is divided into:
[DIN1054:1976], [[ASTM D2321–05]] (Image: Compacted backfill under a motorway) Most of the areas below the surface of traffic ways and … |
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May 27, 2019 The following categories will be used for a more detailed description: (Image: Unconsolidated soil categories) |
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May 27, 2019 |
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May 27, 2019 The main types of soil are:
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May 27, 2019 By non-cohesive soil, the individual mineral or rock grains form a loose cluster as a result of frictional forces that occur when the grain surfaces rub against each other. The characteristics of non-cohesive soil are influenced by the following parameters:
(Image: Non-cohesive soil particles, held loosely together through the grain surface friction) Sands, gravels, stones and their … |
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