Page 21 of European Technical Approval ETA-11/0390, issued on 27.08.2012
English translation prepared by CSTB
of the European
Technical Approval
ETA - 11/0390
Injection System Hilti HIT-CT 1 for rebar connection
Compressed air cleaning (CAC):
Just before setting an rebar the hole must be cleaned
of dust and debris by one of the two cleaning
methods described below:
Blowing
2 times from the back of the hole with oil-free
compressed air (min. 6 bar at 100 litres per minute
(LPM)) until return air stream is free of noticeable
dust.
Brushing
2 times with the specified brush size (brush Ø larger
than borehole 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, please use a new
brush or a brush with a larger diameter.
Blowing
2 times again with compressed air until return air
stream is free of noticeable dust.
Deep Boreholes – Blowing
For boreholes deeper than 250mm use the
appropriate air nozzle Hilti HIT-DL (see Table 7 or
Table 9).
Deep boreholes – brushing
For boreholes deeper than 250mm use machine
brushing and brush extensions HIT-RBS.
Screw the round steel brush HIT-RB in one end of
the brush extension(s) HIT-RBS, so that the overall
length of the brush is sufficient to reach the base of
the borehole. Attach the other end of the extension to
the TE-C/TE-Y chuck.
Compressed air cleaning (CAC):
Air nozzle with an orifice opening of minimum 3,5mm
in diameter recommended for blowing out with
compressed air (min. 6 bar at 6 m³/h).
Annex 11
Installation instruction III
Clean bore hole - Compressed air cleaning (CAC)
min. 2x
min. 2x
