Sockets must often be drilled to port delaminations or cracks so tightly packed with dirt that they cannot be injected from the surface. If conventional masonry bits are used to drill a porting socket, debris from the process is likely to be impacted into the void, obstructing the flow of the resin.
Lily-built Hydro-Vac Drilling Assemblies avoid impaction by evacuating the drilling debris as it is generated. Vacuum or water flushing are used for the purpose. Both techniques use hollow carbide spade bits. Water is introduced to flush the debris from the hole in hydro drilling, and a vacuum is created to evacuate the debris by suction.
If the concrete is dry, and the fault is .010” in width or greater, vacuum is preferred over hydro simply because it is a dry process. And besides, production is increased when drilling into slabs because debris that would otherwise accumulate and cushion the impact of the bit is quickly removed.
If the concrete is damp, the hydro feature works well. Water is introduced through supple nylon tubing connected to a Delrin swivel. The water flushes the debris from the socket as it is generated. The hydro system is very thorough, keeping fine hairline fissures free of impacted debris.
The Hydro/Vac Hollow Drill Bits (P-400) are sturdy, and the carbide is the best quality. The may be re-sharpened numerous times. The Hydro/Vac Hollow Drill Bit drills a nominal 1/2″ hole to a 4″ maximum depth.