PIPE RAMMING SYSTEM WITH HYDRAULIC CROWD

摘要

A horizontal pipe ramming system includes a hydraulic crowd system. A hydraulic percussive hammer is mounted on a carriage that is urged forward by hydraulic cylinders acting between the carriage and an abutment. The continuity of crowd is enhanced by a compressive resilient assembly that releases its energy to the hammer to keep it in contact with the pipe after impact.

主权项

1. In a pipe ramming system having a percussive hammer for repetitively transmitting an impact force to a pipe aligned with said percussive hammer, an improved crowd system for maintaining pressure of said hammer against said pipe wherein said crowd system is a hydraulic crowd system.