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Shown here is a typical pneumatic bursting construction site setup for the pulling in of segmental pipes. (Image: Hydraulic chain tensioner) (Image: Pneumatic pipe bursting in combination with pulling-in of discrete pipes with reference to [FI-Tracta]) |
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During the pulling-in of segmental pipes, it is necessary to form a tensile unit with the expander head. A tensile-force-tight connection between the pipe segments is established using a chain, which is connected to the expander head. One example of how this can be done is by using a hydraulic chain tensioner. (Image: Fixing of discrete non-tensile pipes during pneumatic pipe bursting using a hydraulic chain tensioner) |
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(Image: Virtual construction site: Dynamic Pipe Bursting Screenshot) Click here for the virtual construction site on dynamic pipe bursting. |
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(Image: Full pipe embedment using concrete) (Image: Partial pipe embedment using concrete) The pneumatic bursting process is especially suitable for high-density and non displaceable soils. Therefore, it is also used in instances where the old pipe is partially or completely surrounded with concrete (see figure). The rehabilitation lengths are, amongst other factors, determined by the length of the compressed air hose of the pneumatic hammer. To avoid … |
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May 13, 2020 |
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Bursting and Expander head (Image: Bursting and expanding body for static pipe bursting) The bursting head consists of the expander head only, when working with brittle pipe materials. Cutter / Roller knife (optional) (Image: Roller knife for static pipe bursting) The bursting head additionally has a cutter / roller knife at the front when working with flexible and ductile pipe materials. |
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Tthe equipment used for the pulling and placement of a pipe using the static bursting method is shown below. (Image: Equipment for pulling-in a continuous pipe using static pipe bursting) (Image: Static pipe bursting - Expander head) (Image: Static pipe bursting - pushing/pulling carriage) (Image: Pushing- and pulling-equipment with carriage) (Image: Hydraulic drive control station) |
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A special clamping system is used for the pulling-in of segmental pipes. (Image: Clamping system for the laying of discrete pipes during static pipe bursting (Burstfix) with reference to [FI-Tracta]) |
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Equipment used in the Grundoburst method
(Image: Grundoburst process [FI-Tracta] - Pushing- and pulling-equipment with carriage in the starting excavation) (Image: Grundoburst method-… |
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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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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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