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The Grundoburst process implements a hydraulically driven pulling- and pushing unit to generate the forces required for pipe bursting, displacement, and the insertion of the new pipe using a locking ladder-type rod linkage [FI-Tracta]. First, the hydraulically driven push and pull unit is placed and secured in the reception pit. (Image: Pulling- and pushing-rod passing through the manhole) (Image: Installation of the pulling- and pushing-rod [FI-Tracta]) |
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Then, the guide rod and the pulling rods are pushed from the reception pit through the host pipe and into the insertion pit. The manual connection of the rod elements is carried out continuously in the reception pit using a screw or interlocking type system. (Image: Illustration of the static pipe bursting - pulling-in of a continuous pipe) (Image: Guide head) (Image: Pulling- and pushing-rod passing through the manhole) |
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In the insertion pit, the guide head is replaced by a bursting head (expander head plus cutting and roller blades if necessary). The new HDPE-continuous pipe is then subsequently fixed to the bursting head via an expanding nipple or a PE connection adapter. Through the retraction of the bursting rod in the direction of the reception pit, the old pipe is fragmented and displaced into the surrounding soil by the bursting head. As a result, the new, … |
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Advantages:
Disadvantages: |
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The static pipe bursting process is suitable for the replacement of ductile pipe materials due to the possibility of adding knife/roller cutters to the expander head. Hydraulic power stations with outputs up to 500 t allow for the replacement of pipe diameters DN 40 in (1000 mm) and beyond. Additionally, the pulling in of welded steel pipes in lengths exceeding 3300 ft (1000 m) is possible. The use of the pulling and pushing rod assembly, along with … |
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May 13, 2020 |
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A hybrid of the static and pneumatic bursting is the ConSPLIT process. The existing steel, ductile cast iron or plastic pipe is cut using cutting wheels and then displaced by an expander head into the surrounding soil. The new pipe is pulled in directly behind the expander head. If necessary, the cutting process is supported by a pneumatic hammer. (Image: ConSPLIT - Schematic construction with reference to [FI-PIM] [Image: S&P GmbH]) (Image: Pipe splitting - … |
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May 13, 2020 |
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The hydraulic bursting head consists of hydraulically expandable segments which are used to rupture the old pipe and displace its fragments into the surrounding soil, and thus expand the cross section. (Image: Hydraulic pipe bursting - Bursting head with 3 expandable segments (closed)) (Image: Hydraulic pipe bursting - Bursting head with 3 expandable segments (opened)) There exists the risk that the joints of the expansion mechanism may become blocked … |
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This method is suitable for pipelines with a nominal size range from DN 8 in (200 mm) up to DN 16 in (400 mm). (Image: Hydraulic bursting head) (Image: Hydraulic bursting head) (Image: Hydraulic bursting head [FI-KMG]) |
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The expPRESS process was originally developed in Sweden and is available in four versions, ranging in size from DN 7 in to DN 36 in (180 mm - 900 mm). It can also be used with larger pipes using additional equipment [FI-Entre] [Jürge90].
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On site setup of the expPRESS pipe bursting system. (Image: Schematic description of the expPRESS pipe bursting with reference to [FI-Teerb] [Image: S&P GmbH]) (Image: expPRESS pipe bursting - Construction site) (Image: expPRESS pipe bursting [FI-Teerb] - Bursting head with hydraulic jacking arrangement) (Image: expPRESS pipe bursting [FI-Teerb] - bursting head in the starting pit) |
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The bursting forces may vary according to the device type and the expansion dimension.
(Image: Bursting forces during expPRESS pipe bursting (example) [Jürge05]) |
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Even though hydraulic pipe bursting is still used internationally, its use in some jurisdictions is limited. The main reason for this is the development of the static pipe bursting. Static pipe bursting does not require additional pit excavation; it uses existing manhole structures in conjunction with properly designed segmental pipes to deliver a much faster, continuous (single-phase) bursting process, as opposed to the hydraulic methods' two-phase (… |
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May 13, 2020 |
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May 13, 2020 (Image: Documentation) For quality assurance purposes, all the equipment used for the pulling-in of the new pipeline is to be used in accordance with the manufacturer’s recommendations and within the limits of the expected forces. In addition, the contractor must document all relevant working steps, whereby the exact type and scope of the documentation must be defined between the owner and the contractor prior to the commencement of work. It is good … |
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May 13, 2020 (Image: Documentation) On-site Documentation The on-site documentation should include at least the following documents:
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May 13, 2020 (Image: Leaktightness) Finishing work and quality testing In order to ensure that the pipelines replaced using the pipe bursting method maintain the same durability and performance as those replaced by open cut, the same finishing work and quality tests apply: Tests:
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May 13, 2020 |
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Congratulations! You have successfully finished this module. Next you will have the opportunity to review the newly acquired knowledge with an interactive questionnaire. You can navigate back to any point in the modules if you wish to review a specific point or subject. Stay curious! |
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May 13, 2020 Replacement of supply and disposal pipelines (gas, water, wastewater) means the construction of new pipelines in the same alignment, whereby the new installations incorporate the function of the original pipeline.
This module covers the pipe bursting replacement technique associated with the trenchless construction method.
After completing this module, you will have a sound knowledge of:
- rules and regulations;
- pipe bursting methods, their areas and limits of application and their advantages and disadvantages;
- selection of suitable pipe bursting methods depending on pipe defects and boundary conditions.
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Mar 13, 2019 Important: Pipelines and manholes are civil engineering structures in which the proper interaction of components, embedment, initial and final backfill as well as the surrounding soil is the basis for stability and operational safety. Therefore, an understanding of soil (or rock)
is an indispensable prerequisite for its use in civil engineering in the … |
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Mar 13, 2019 To the field of Geotechnology belong, amongst others, the following scientific disciplines:
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Mar 13, 2019 Owing to its varying behaviour when loaded by structures, [ [EN1997-1:2009]] classifies the subsoil into undisturbed and disturbed soil (subsequently altogether called soil) as well as rock (solid rock). In practice, however, a distinction between undisturbed and disturbed soil is not made. Consequently, all loose material is covered by the collective term “soil”, whereas all solid material is called “rock”. The different types of soil are to be...… |
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Mar 13, 2019 The following slides will look at soil characteristics in greater detail. |
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