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Pulling-in of a continuous pipe Pulling-in of discrete pipes with a smooth outer surface (Image: Pneumatic pipe bursting process - pulling-in of discrete pipes) Pushing-in of discrete 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 pipelines which are made of various types of materials (with the exception of pre-stressed and reinforced concrete with heavy reinforcement) exhibiting the following damages:
(Image: Longitudinal crack in the region of the pipe joint resulting positional … |
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(Table: Bursting lengths - gravity pipelines [FI-Tracta]) |
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(Table: Bursting lengths - pressure pipelines [FI-Tracta]) |
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Application limits are affected by:
(Image: Encasement and special supports of vitrified clay pipes with concrete with … |
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Advantages of pipe bursting:
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Disadvantages of pipe bursting:
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The pneumatic bursting unit generally consists of the following components: 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] - Read 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 discrete 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 discrete pipes it is necessary to form a tensile unit with the expander head. A tensile-force-tight connection between the discrete pipes is established using a chain, which is connected to the expander head. This can be done with the help of a e.g. hydraulic chain tensioner. (Image: Fixing of discrete non-tensile pipes during pneumatic pipe bursting using a hydraulic chain tensioner) |
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(Image: Full embedment of the pipe using concrete) (Image: Partial embedment of the pipe using concrete) The pneumatic bursting process is especially suitable for high-density non displaceable soils. Therefore, it is also used in instances where the old pipe is partially or completely surrounded with concrete (Fig.). The rehabilitation lengths are, amongst other factors, dictated by the length of the compressed air hose of the pneumatic hammer. To avoid … |
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Advantages:
Disadvantages:
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Bursting and Expander head (Image: Bursting and expanding body for static pipe bursting) The bursting head consists only of the expander head 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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Here you can see the equipment used for the pulling and placement of a pipeline using the static bursting method. (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 discrete pipes. (Image: Clamping system for the laying of discrete pipes during static pipe bursting (Burstfix) with reference to [FI-Tracta] [Image: S&P GmbH]) |
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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 [FI-Tracta] implements a hydraulically driven pulling- and pushing unit to generate the forces required for the pipe bursting, displacement, and the insertion of the new pipe using a locking ladder-type rod linkage. 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 [… |
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Then the guide rod and the pulling-rods are pushed from the reception pit, through the host pipeline 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. |
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