Pipe bursting is a method for the replacement of existing fracturable pipes (e.g. earthenware, vitrified clay, cast iron, asbestos cement, unreinforced concrete, PVC).
- The minimum specification for pipe bursting shall be as follows:
- The manholes at each end of the pipe shall be prepared for bursting by removal of the benching at the two pipe entry points.
- If there are no manholes, pits shall be excavated at each end and the pipe to be replaced shall be cut at each end, typically 5m-100 m apart.
- A bursting or splitting head shall then be drawn through the pipe, fracturing the old pipe and drawing in the new pipe behind it.
- A maximum of 10mm shall result between the burst pipe and the inserted lever pipe. Any space in excess of the 10mm shall be grouted.
- On reaching the reception manhole, the bursting head shall be disconnected and the benching in the two manholes repaired.
- Where PVC-U pipes with restrained rubber ring joints are used for bursting, the maximum length of bursting shall be 120m or as recommended by the pipe manufacturer.
- Any bending of the pipes, bursting or tensile loads applied to the pipe during insertion into the bored hole shall not exceed the manufacturers recommendation.