| 摘要 |
An improved apparatus is disclosed for the driving of a string of pipe joints into the earth. A derrick is erected with a hammer 33, a self- propelled gear driven carriage 26 for the hammer, and an independently controlled pipe handling mechanism 41 mounted on the carriage. Pipe joints stacked at the base of the derrick are lifted up by the pipe handling mechanism and positioned under the hammer. The carriage continuously positions the hammer near the top of the pipe joint as it is being driven into the earth. <IMAGE> |
