Installation Guide

13
en
2. Borehole preparation
For use in case of: diamond cored boreholes, holes filled with standing water and / or under water applications,
observe the following steps prior to the borehole cleaning procedure.
•
Flush hole by inserting a water hose (water-line pressure) to the back of
the hole until water runs clear. Perform this step twice.
•
Brush the hole 2 times with the specified brush size (brush Ø ≥ bore-
hole Ø) by inserting the round steel brush to the back of the hole in a
twisting motion.
•
The brush shall produce natural resistance as it enters the anchor hole.
If this is not the case, use a new brush or a brush with a larger diameter.
•
See Table II for the corresponding round steel brush / drill bit combi-
nation.
•
If required, extend the reach of a steel brush, HIT-RB, by attaching it to
an extension HIT-RBV in order to reach the back of the borehole.
•
Attach the other extension end into the brush handle HIT-RBH, accord-
ing to Table III.
•
Flush the borehole again until water runs clear. Perform this step twice.
Special Case: Machine Brushing
0
0
•
Brush extensions HIT-RBS for machine brushing shall be used to acco-
modate cleaning of boreholes deeper than 250 mm (10”) (for d
s
= 8
mm (3/8")…12 mm (1/2") or deeper than 20 xd
s
(for d
s
> 12 mm (1/2")),
respectively.
•
Select the corresponding brush extension HIT-RBS according to Table
III.
•
Attach the round steel brush, HIT-RB, on to one end of the brush exten-
sion(s) HIT-RBS, in order to reach the back of the borehole.
•
Secure the other extension end into the TE-C/TE-Y (-T) holder.
Tips:
•
Start machine brushing operation slowly.
•
Start brushing operation once brush is inserted in borehole.
Flushing
Brushing
Flushing
02_BA_HIT_Profi_P1_en.qxd 13.12.2006 13:37 Uhr Seite 13