Be present in the rehabilitation of the underground without disrupting the surface activity.

Riabilitazione Condotte - Pipe Bursting

Pipe Bursting

Pipe bursting is a well-established trenchless method that is widely used for the replacement of deteriorated pipes with a new pipe of the same or larger diameter. Pipe bursting is an economic pipe replacement alternative that reduces social disturbance to business and residents, if compared to open cut   or other rehabilitation techniques.

Pipe bursting is defined as a trenchless replacement method in which an existing pipe is broken either by brittle fracture or by splitting, using an internal force mechanically applied by a bursting tool. At the same time, a new pipe of the same or larger diameter is pulled in order to replace the existing pipe. The back end of the bursting head is connected to the new pipe, and the front end is connected to a cable or pulling rod. The new pipe and bursting head are fed in from an insertion pit, and the cable or pulling rod is pulled out of the receiving pit. The energy (or power ) which moves the bursting tool forward into the existing pipe comes from pulling cables or rods, hydraulic power to the head, or pneumatic power to the head, depending on the bursting system design. This energy (or power) is converted to a fracturing force in the existing pipe and temporarily expands the diameter of the cavity. The bursting head is pulled through the pipe debris creating a temporary cavity and pulling the new pipe behind it from the insertion pit.

The leading or nose portion of the bursting head is often smaller in diameter than the existing pipe, to maintain alignment and to ensure a uniform burst. The base of the bursting head is larger than the inside diameter of the existing pipe to be burst, to fracture it. It is also slightly larger than the outside diameter of the replacement pipe, to reduce friction on the new pipe and to provide space for maneuvering the pipe.

Pipe bursting is especially effective if the existing pipe has inadequate capacity and has substantial structural damages preventing other trenchless methods from being utilized. This method can be used advantageously to reduce damage to pavements and disruptions to traffic, hence reducing the social costs associated with traditional pipeline replacement, as well as providing a significantly smaller environmental footprint. This method is considered a favorable alternative to other trenchless rehabilitation methods such as CIPP that relines an existing pipe with a liner matching the profile of the existing pipe ID while reducing it by the thickness of the lining material installed.

Pipe bursting is often used in comparative analysis with other rehabilitation methods. However, it should be considered as a replacement method because it actually involves the installation of  a new pipe.