Patented Grout through System for foundation and bridge drilling.
Holte’s grout through technology comes standard in all our reverse circulation down hole hammers. By eliminating the traditional check valve in the top and distributing them around the bottom of the inner barrel, Holte Hammers virtually prevent water and debris from entering the operating parts concealed within the hammer. This patented innovation allows grout to be pumped in at the top head where it flows through the center tube of a dual wall pipe and on through the hammer from above. It also contributes to extending the life of working parts within the hammer since they remain protected from contamination during all phases of drilling.
Using a Holte Reverse Circulation System with a custom top head or conversion allows holes to be drilled and grouted using any of our RC hammers. When drilling and the desired depth is achieved a valve is opened in the top head allowing grout to be pumped in through the top head as the drill string, which can also be designed to be the casing in overburden conditions, is retracted to the surface. Simply tram to the next hole and repeat the process while rebar and pile reinforcement is added as the rig remains working.
Advanced monitoring systems are available to ensure integrity of the finished hole while using such things as portable grout plants or cutting containment systems can further simplify the process.