This technique bursts and displaces the existing corroded/encrusted cast iron main allowing a new pipe to be pulled into its path.

HIGH BANDWIDTH RECOMMENDED

Mainsbursting benefits mainly due to its comparative:-

	Reduced Cost.
	Minimized surface disruption to the highway & costly restoration.
	Minimized disruption to traffic and reduced congestion.

Operation

The pipe, to be replaced is exposed and cut at two points 100m apart. The hydraulic pipebursting rig is positioned in the 'reception pit' and steel rods are individually connected and pushed through the middle of the existing main.

Once inserted to the 'launch pit' the cutting head and expander are attached to the solid steel rods and the new PE pipe is connected via a towing head to the rear.

The hydraulic pipebursting rig is switched into reverse and the steel rods withdrawn and removed whilst pulling the cutting head, expander and new PE pipe into the path of the old main.

This action splinters and cracks the existing main and the expander displaces the fragments into the surrounding soil.