DRILLING AND SLOTTING OF HARD ROCK WITH ABRASIVE SUSPENSION WATER JET

摘要

In densely populated area such as downtown Seoul, the removal of hard rocks for the building or structural foundation requires an extra effort due to complaint from the residents and the owners of neighboring buildings. The conventional methods, such as hydraulic breaker, drill & blast, diamond saw cutting instantly raise the complaint level and usually result in delayed construction schedule. The abrasive suspension water jet system has been developed for the hard-rock drilling, slotting, and notching operations in an attempt to replace the conventional methods. Various types of nozzle heads and manipulators had been designed and field tested in construction sites. Different types of manipulators are covered in this paper with some of the basic working parameters.