17
V1.4 March 15
7.0 INSTALLATION - Vertical borehole
7.1 Borehole depth & cleanliness
The borehole should be drilled as vertical as possible, preferably within 1 degree.
Once drilled to final depth the borehole should be flushed out with clean water and checked
that it is open to the bottom.
CHECK THE DEPTH BEFORE INSTALLING
ENSURE DEPTH ALLOWANCE FOR GROUT VALVES IF USED
6.2 Alignment
One set of grooves should be aligned with the expected direction of movement as below.
NEVER TRY TO TWIST OR PUSH THE CASING FROM THE TOP AS THIS
WILL CAUSE TORSION, TWIST AND SPIRALLING OF THE GROOVES
Direction of expected
ground movement
Groove alignment
