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Jul 01, 2021 This presentation is part of the series of presentations "Utility Tunnelling" and deals with the various types of shield machines, the removal of obstacles and possible errors in pipe jacking.
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Underground pipelines and utilities are predominantly installed by using the tradition open-cut (i.e., cut and fill) method: a trench is dug, the lines are installed by constructing proper embankment or sheeting or using a trench box, and the trench is filled afterwards. In the face of the numerous challenges (e.g., urbanization, densely populated areas) as well as growing environmental consciousness, it is important to consider trenchless technology … |
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(Image: Manned techniques) (Image: Steerable techniques) Pipe jacking: |
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Jacking station: Main jacking station: (Image: Technical components in pipe jacking - main jacking station) |
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(Image: Intermediate jacking station - view of the jacking cylinders) (Image: Design and arrangement of intermediate jacking stations - Detail view of the jacking cylinders) (Image: Intermediate jacking station before installation of the cylinders) (Image: Built-in and activated cylinders of an intermediate jacking station) (Image: Intermediate jacking station before the installation in the pipeline tract)Intermediate jacking stations are integrated … |
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Intermediate jacking stations are divided into two groups
The recoverable IJS are installed from nominal size DN/ID 500 either immediately behind or at a short distance behind the jacking or shield machine and are pushed out of the target shaft with the pipe string or they are placed in the jacking string in such a way that the IJS is positioned exactly in an intermediate shaft after the end of the jacking and can be recovered … |
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With intermediate jacking stations (IJS), the pipe string is divided into separate jacking sections, which are driven in cycles with a correspondingly reduced skin friction if necessary. This means that the intermediate jacking station only drives the advance section that lies in front of the IJS in the direction of advance. The rear part of the pipe string remains at rest. When the IJS is activated, it uses the rear pipe string including the main … |
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(Video: Arrangement and development of the forces of intermediate jacking stations during pipe jacking) Video:Arrangement and development of the forces of intermediate jacking stations during pipe jacking [Image: S&P GmbH]. This interactive object is only visible online. |
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For long jacking distances the single intermediate jacking stations are either supplied
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(Image: Overview of shield machine types) |
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