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A special form of pipe bursting is referred to as Calibre Bursting. Calibre bursting is an application of the static and dynamic pipe bursting methods which are discussed in the subsequence sections. Calibre bursting uses a bursting head with a smaller outside diameter than the nominal diameter of the old pipeline. Thus, applying force on the old pipe walls, and their subsequent displacement, is limited only to sections with cross-sectional reductions … |
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Pulling-in of a continuous pipeline Pulling-in of segmental pipes with a smooth outer surface (Image: Pneumatic pipe bursting process - pulling-in of discrete pipes) Pushing-in of segmental pipes with a smooth outer surface (Image: Hydraulic pipe bursting process - pushing-in of discrete pipes) |
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Requirements for the implementation of pipe bursting:
(Table: Areas of application for pipe bursting) |
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Pipe bursting can be used for the replacement of pipes which are made of various types of materials (with the exception of pre-stressed and reinforced concrete with heavy reinforcement) exhibiting the following issues:
(Image: Longitudinal crack in the pipe joint area resulting in positional … |
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(Table: Bursting lengths - gravity pipelines [FI-Tracta]) |
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The International Pipe Bursting Association (IPBA) classifies pipe bursting work into four classes, i.e., A-B-C-D, according to the degree of difficulty or complexity for work execution. This classification is meant to be used as a general guideline in the design and preconstruction phase of a pipe bursting replacement. Project success depends on the qualifications of the project team, geotechnical conditions, existing pipe material and condition, … |
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(Table: Bursting lengths for pressure pipelines [FI-Tracta]) |
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Application limits are affected by:
(Image: Encasement and special supports of vitrified clay pipes with concrete … |
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Advantages of pipe bursting:
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Disadvantages of pipe bursting:
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May 13, 2020 |
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The pneumatic bursting unit generally consists of an expander head and a pneumatic driving device. An auxiliary bursting cap can be added if required. (Image: Expanding head for pneumatic pipe bursting) (Image: Pneumatic bursting unit) (Image: Pneumatic pipe bursting unit with an auxiliary bursting cap and expander head in the rear; replacement with a HDPE continuous pipe from the insertion pit to the reception pit) |
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In the standard bursting unit arrangement, the expander head is located at the front. (Image: Pneumatic bursting unit as per [FI-Tracta] - Forward mounted expander head with cutting knives) (Image: Pneumatic bursting unit as per [FI-Tracta] - Forward mounted expander head with cutting knives) |
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In order to increase the directional stability, the expander head can be placed further back on the bursting unit. (Image: Pneumatic bursting unit as per [FI-Tracta] - Rear mounted expander head with cutting knives) (Image: Pipe bursting in combination with annular space grouting as per [FI-Tracta] - Arrangement of the lining adaptor when pulling-in discrete pipes) |
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Shown here is a typical setup used for the pulling-in of continuous pipe using the pneumatic pipe bursting method. (Image: Equipment for the pulling-in of a continuous pipe with pneumatic pipe bursting) |
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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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Advantages:
Disadvantages:
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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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