The preferred method of trenchless infrastructure replacement, allowing size on size, or even a larger pipe than original to be installed in situ. It involves simultaneous destruction of existing pipe, and replacement with new pipe. An oversized hardened steel cone is pulled through an existing pipe which fractures the old pipe and displaces it outwards into the soil. The new HDPE pipe follows, attached to the back of the steel cone.
How does pipe bursting work?
Two small pits are dug to gain access to either end of the existing pipe. At the launch pit, a seamless HDPE pipe is attached to the bursting head in preparation for installation. A heavy duty cable is inserted through the existing line ready to be replaced. At one end, the bursting head and new pipe is attached, along with a pulling unit at the other end. Using hydraulic force, the machine tensions the cable and the bursting head and new HDPE line are pulled through the existing pipe. The new line is connected and inspected, and the entry pits are filled and returned to their original condition.
The advantages of pipe bursting
Pipe bursting is the ultimate solution in cases where there is existing infrastructure that needs to be replaced. It is cost effective and surprisingly quick, with projects as long as 200 meters being completed within one day.
The limited amount of excavation required makes this technique environmentally
friendly, and allows for the preservation of landscaping, asphalt, curb and gutter, and other features in busy metropolitan areas. Pipe bursting can be used to replace cast iron, clay tile, asbestos cement, concrete, and even ductile iron mains.