A method and apparatus for the underground installation of pipelines. The underground installation of pipelines is carried out by driving pipe sections into the ground. The earth is loosened at the driving face via a liquid jet, and the excess earth is transported away from the removal zone. Only so...http://www.google.es/patents/US4673312?utm_source=gb-gplus-sharePatente US4673312 - Method and apparatus for the underground installation of pipelines
Method and apparatus for the underground installation of pipelines
