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(Image: Distribution of damages in pipe jacking in Germany (source: IFB, Hanover 1993)) |
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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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The components required for pipe jacking depend on the variant used to support the workface or convey excavated soil. However, the following key components are essential:
(Image: Schematic presentation of a pipe jacking - NEU) (Video: Pipe jacking in Bahrain) |
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Jacking station: Main jacking station: (Image: Technical components in pipe jacking - main jacking station) |
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View into the starting shaft. The individual components are clearly visible: the jacking pipe (1), the main press station consisting of the jacking cylinders (3) including all necessary hydraulic equipment as well as the thrust wall (4) and the thrust ring made of steel (2). (Image: View into the starting shaft - Arrangement for pipe jacking) (Image: Damage to the jacking abutment due to inadequate dimensioning - Jacking forces cannot be absorbed by … |
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(Image: Attention!) By means of the thrust ring, the jacking forces are evenly transferred to the circumference of the pipe face of the respectively last installed jacking pipe The thrust ring normally consists of torsion-resistant and low-deformation unperforated weldments of steel plates. In most cases, the pipe ring is designed as an annular, reinforced box girder with parallel, flat front faces. The jacking cylinders that transfer the forces to … |
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Intermediate jacking station: (Image: Technical components in pipe jacking - intermediate jacking station) Intermediate jacking stations (IJS) also called interjack (stations), consist of several jacking cylinders that are … |
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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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