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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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In the following, jacking pipes used for pipe jacking will be understood to be prefabricated pipes with compressive force-fit, movable or rigid connections within the wall thickness and a smooth even external contour, which are pressed into the subsoil or cavity. Jacking pipe for pipe jacking: |
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Jacking pipes have a double function: They constantly support the excavated cavity and, in the case of a single shell lining, they provide the structure of the pipeline (final lining). (Image: View into the jacking pipes) (Image: Reinforced concrete jacking pipes) |
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(Image: Materials for jacking pipes used in pipe jacking) |
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A shield machine is a steerable shoring construction, in the protection of which the soil / rock on the working face is excavated manually, mechanically or hydraulically. It consists of at least two flexible connected steel pipe pieces, the front shield segment and the trailing shield segment, which is supported by the jacking pipe string. A distinction is made here between open and closed shields or shields with partial and full face excavation.… |
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(Image: Overview of shield machine types) |
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Open shields: Open shields do not have a pressure-tight seal between the working face and the subsequent pipe string. They are characterized by relatively good access to the working face and easy-to-use machine technique. (Image: Hand shields - Overall view of a hand shield (external diameter 2098 mm) [FI-Nishi]) (Image: Open shield) (Image: … |
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