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Steering cylinder: By extending/drawing in single steering cylinders, the shield machine is steered out of the direction of the jacking pipes. (Video: Steering of the shield machine by means of steering cylinders) |
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Mixing plant: (Image: Mixing plant with supply pump) |
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Mixers are available in various sizes and consist mostly of:
Most mixing plants are designed in a modular fashion in order to be able to be placed into service in a relatively simple and flexible fashion with reference to the required capacity. This approach also allows easy combinations with separation plants. (Image: Model … |
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As regards the injection technology, a differentiation is made between:
(Image: Lubricating the pipe string in the ULTIMATE METHOD (… |
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The manual injection in an accessible pipe string can also be referred to as manual lubrication. The lubricant is injected into the annular gap by manually activated upstream valves via individual injection nozzles which are evenly installed in the pipe circumference and the pipe string. This procedure is today only applied in very short tunneling sections, especially with shield machines with partial excavation. Disadvantages of manual grouting via … |
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Common values in practice, for instance, are a maximum of 5 bar injection pressure or 20 second injection duration per grouting nozzle. The spacing of the so-called lubrication stations - jacking pipes with works-installed injection nozzles - is based on experience and, when using a bentonite suspension as lubrication and support medium, and for long jacking distances, is between 9 to 15 m. Example: Every third jacking pipe (3 m) is equipped with … |
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(Image: Technical components in pipe jacking - separation plant) Separation plants: |
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(Image: Attention!) The separation of solids particles from the flushing medium is carried out in several steps in the separation plant corresponding to the particle fraction of the spoil, for instance by means of:
As a rule, the first two methods mentioned above are always used. … |
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(Video: Schematic illustration of a two-stage hydrocyclone separation plant with subsequent centrifuge) Video: Schematic illustration of a two-stage hydrocyclone separation plant with subsequent centrifuge with reference to [Rubar99] [Image: S&P GmbH]. This interactive object is only visible online. |
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Jul 01, 2021 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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Today, supply and discharge lines are still predominantly installed by using the open-cut method: a trench is dug, the lines are installed. Under the protection of an embankment or sheeting and the trench is filled afterwards. In the face of the numerous disadvantages as well as the citizens' growing environmental consciousness in the future it is urgently necessary to take trenchless technology into account much stronger than until today as an alternative … |
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