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Centre cutters are excavation tools arranged in advance in the centre of the boring head in order to release the pressure in the centre of the working face during boring and especially in cohesive soils such as clay and silt with low to high plastic properties to counteract sticking of the boring head. |
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(Image: Pros and cons) Backloading: The advantages of the backloading system:
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The soil mechanically loosened at the working face is transported into a suspension chamber through corresponding inlets. The suspension chamber is constantly supplied with water or a bentonite suspension by means of a feed pipe inside the pipe string. Over a second line (discharge line) the solid-fluid-mixture of soil and water/bentonite suspension is constantly absorbed and is transported to the ground surface. (Image: Hydraulic soil conveying) (… |
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May 18, 2020 Today, the installation of gas, water and wastewater pipelines is still predominantly carried out using open trenches. In view of the numerous disadvantages associated with this method, it is imperative that trenchless pipeline construction be considered much more strongly in the future than it has been to date as an alternative in the planning and construction of sewers and pipelines.
This module deals in detail with the procedure and the various components. Emphasis is placed on the different types of shield machines, excavation tools, separation systems, the control and steering station, injection/grouting agent and soil extraction and reprocessing.
After completing this module, you will have a sound knowledge of:
- all components of pipe jacking and
- their function and tasks.
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