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This document provides a history of down-the-hole drilling methods, including both air-powered and water-powered hammers. It discusses how down-the-hole drilling has been used for decades for dam anchoring and rock grouting in the US, starting with compressed air but more recently shifting to using water-powered hammers. Water hammers provide advantages like using water for flushing cuttings instead of compressed air. The document outlines the development of water hammers and their advantages over air hamme

Author

Reza

Language

EN