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How does the drilling with Wassara technology influence the quality of the borehole wall for this important succeeding grouting procedure?

Answer:

Drilling with Wassara results in clean holes (especially compared to drilling with air-powered equipment), ensuring high quality in the following grouting procedure allowing the cement grout to reach longer into the cavities. This is due to the low up-hole water velocity that minimises borehole erosion. The good borehole wall surface is also optimal for usage of packers.