DYWI® Drill Hollow Bar System - Grouting
The grout injection technique used for the installation of DYWI® Drill Hollow Bars is dependent on the type of drilling and the respective application. The most popular method is simultaneous drill and grout. This method ensures that all points of the borehole are homogeneously grouted as drilling is advanced.
For simultaneous drilling and grouting, pressure requirements are not high (up to 7 bar), but constant supply is necessary to ensure that grout circulates within the borehole during drilling. For granular soils, a small return of grout at the mouth of the borehole is all that is required; for cohesive soils, greater flush is necessary.