DYWI® Drill Hollow Bar System
Grout Swivels, also known as Rotary Injection Adaptors, are used for simultaneous drill and grout installation, to inject grout into the bore of a rotating DYWI® Drill Hollow Bar. The unit comprises of a heat treated shaft (to withstand the impact energy from the hammer drive) and a housing into which the grout is pumped. Inlet ports within the shaft enable grout to be pumped into the bore of the bar.
A bracket is required (attached to the drifter) to prevent the housing from rotating with the shaft, as well as positioning it at the correct location to enable unrestricted operation of the hammer.
A range of drill accessories are available to permit a connection between the output drive of the drilling head and the different DYWI® Drill Bar diameters.