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David B Crafts

Robert Ward Carter

Maxwell Frank Darrow

A pipe bursting system and method, and components thereof, are described wherein a bursting head assembly pulled by a cable employs a relatively small pneumatic impactor (hammer) and a relatively large cable tension to impose a cyclical stress on the pipe being burst to cause fatigue failure of the pipe, resulting in lower size and power requirements, and higher efficiency for a given set of job requirements.

Method and apparatus for replacing underground pipe

A pipe bursting system and method are described wherein a bursting head pulled by a cable employs a relatively small pneumatic hammer and a relatively large cable tension to impose a cyclical hoop stress on the pipe being burst to cause fatigue failure of the pipe, resulting in lower size and power requirements, and higher efficiency for a given set of job requirements.

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Vallejo, CA, United States of America

David B Crafts