|
|
The static pipe bursting process is also 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 1000 and beyond. Also possible is the pulling in of pipelines made of welded steel pipe in lengths exceeding 1000 m. The use of the pulling- and pushing-rod assembly along with the vibration … |
||||||||
|
|
Advantages:
Disadvantages: |
||||||||
|
|
|||||||||
|
|
Dec 20, 2013 A hybrid of the static and pneumatic bursting is the ConSPLIT process. The existing steel, ductile cast iron or plastic pipeline is cut using cutting wheels and then displaced by an expander head into the surrounding soil. The new pipeline 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: … |
||||||||
|
|
|||||||||
|
|
The hydraulic bursting head consists of hydraulically expandable segments which are used to rupture the old pipeline 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 … |
||||||||
|
|
This method is suitable for pipelines with a nominal size range from DN 200 up to DN 400 . (Image: Hydraulic bursting head) (Image: Hydraulic bursting head) (Image: Hydraulic bursting head [FI-KMG]) |
||||||||
|
|
The expPRESS process was originally developed in Sweden and is available in four machine versions ranging in size from DN 180 to DN 900. It can also be used with larger pipes using additional equipment [FI-Entre] [Jürge90]. |
||||||||
|
|
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 [FI-Teerb] - In-situ situation) (Image: expPRESS pipe bursting [FI-Teerb] - Bursting head with hydraulic jacking arrangement) (Image: expPRESS pipe bursting [FI-Teerb] - bursting head in the starting pit) |
||||||||
|
|
The bursting forces are dependant on the device type and the expansion dimension.
(Image: Bursting forces during expPRESS pipe bursting (example) [Jürge05]) |
||||||||
|
|
Even though pipe bursting using the hydraulic bursting method is still utilised internationally, its use in the German market is negligible. The main reason for this is the development of the static pipe bursting, which does not require additional pit excavation but rather uses existing manhole structures in conjunction with accordingly dimensioned discrete pipes to deliver a much faster, continuous (single-phase), bursting process as opposed to that … |
||||||||
|
|
|||||||||
|
|
Dec 20, 2013 (Image: Documentation) For the quality assurance purposes, all of 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. The … |
||||||||
|
|
Dec 20, 2013 (Image: Documentation) On-site Documentation According to [DWAM143-15:2005] the on-site documentation should at least include the following documents:
|
||||||||
|
|
Dec 20, 2013 (Image: Leaktightness) Finishing work and Quality Testing In order to ensure that the sewers and pipelines replaced using pipe bursting maintain the same durability and performance as those replaced using the open cut method, the same finishing work and quality tests according to DIN EN 1610 also apply [DWAM143-15:2005]. Tests:
|
||||||||
|
|
Dec 20, 2013 Contractor Qualification Subject to EU-guideline from 17/09/1990 (Annex. C of DIN EN 1610), the client can make use of a reference system to check the qualifications of key suppliers or companies. In Germany the Güteschutz Kanalbau eV represents such a system. |
||||||||
|
|
|||||||||
|
|
Dec 20, 2013 Replacement refers to the installation of sewers and drains in place of existing pipelines, where the new pipeline takes over the functions of the old system. The focus of this module is the trenchless replacement method by the means of pipe bursting. In addition to the process description, the areas of application and limits as well as options for quality assurance are discussed.
Upon the successful completion of this module, you will be able to:
• identify and implement the most important rules and specifications,
• select the appropriate replacement methods based on the type of damage and limiting conditions, and
• identify possible causes of errors and describe quality assurance measures.
|
||||||||
|
|
Terms according to [DWA-M143-15]
|
||||||||
|
|
The insertion of the new pipeline using the bursting process can be performed by pulling-in of a continuous pipeline or through the pulling-in or pushing-in of discrete pipes. The former option requires the excavation of access pits and design calculations from an engineer. Therefore, the pulling-in of continuous pipelines will be discussed in greater detail. Pulling-in of a continuous pipe Pulling-in of discrete pipes with a smooth outer surface Pushing-… |
||||||||
|
|
The pulling-in of pipelines involves the continuous insertion of a pipeline into an existing sewer or pipeline. The process for the pulling-in of pipelines is identical to that of the pipeline rehabilitation method refered to as pipe lining. With pipe bursting however a determination of the load transverse to the pipeline axis is carried out according to [DWAA161:2010] (Image: Illustration of the pneumatic pipe bursting - pulling-in of a continuous … |
||||||||
|
|
Depending on its nominal size and material stiffness, the pipeline is either rolled up in its entirety on a coil reel, or is welded together on site using individual long pipe sections. (Image: HD-PE discrete long pipes DA 500) (Image: HD-PE-pipe on a as coil reel) |
||||||||
|
|
(Image: Conventional sliplining process with annular space with reference to [FI-Teerb] [Image: S&P GmbH] - Design of pulling heads for pipes DN 140 to DN 1200) The front tip of the pipeline is equipped with a pulling head which is in turn attached to the pulling cable and winch. The tensile forces are transferred from the pulling head to the pipeline through:
|
||||||||
|
|
(Image: Temperatur) Monitoring temperature variations when working with plastic pipes is of essential importance as they can lead to changes in length of the pipeline which can cause problems, particularly on hot summer days. To avoid this problem, the pipeline insertion should take place in the early mornings when the material temperature and the air temperature in the old pipeline are almost the same. |
||||||||
|
|
(Image: Plus/Minus) Depending on the depth of the old sewer or pipeline, the construction of relatively long insertion pits is necessary in order to prevent damage to the new pipeline as a result of the formation of very small bending radii.
(Image: Static pipe bursting - Pulling-in of the new pipeline) |
11094 search results:
