Drilling a new tower base on a rock

Building a tower base on regular soil is a relatively easy task. But what if the “soil” is hard uneven rock?

Here is a photo of  my situation. The starting point is an uneven rock measuring 1,6 x 1,6 meters. The blue stand offs are the old tower base.

The challenge is how to drill vertically over 16 holes 30 cm  into the rock? Professionals do it by big diamond cutters/drill machines that are vertically positioned. Hilti, Huskvarna etc makes these. However, this requires a flat surface to mount these on. So it wont work in my situation…:(

So use a regular SDS Max drill and attach a horizontal libel (see photo below).

 

This is how it is done. Of course you would need a steel template for the hole pattern to allow you to drill vertically.

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