Page 20 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
Clean hole
The borehole must be free of dust, debris, water, ice,
oil, grease and other contaminants prior to mortar
injection. Inadequate borehole cleaning = poor load
values.
Automatic Cleaning (AC)
Automatic Cleaning (AC):
Cleaning is performed during hollow drilling (HDB) with
Hilti TE-CD and TE-YD drilling system including
vacuum cleaner.
Manual cleaning (MC)
Manual
cleaning
is
permitted
for
hammer
drilled
boreholes up
to
hole diameters d
0
≤ 20mm and depths
v
resp.
e,ges.
≤ 10xd
s
.
Blowing
4 strokes with
Hilti blow-out
pump from the back of the
hole until return air stream is free of noticeable dust.
Brushing
4
times with
the specified
brush size (brush diameter ≥
borehole
diameter d
0
) by inserting the
round
steel
wire
brush to the back of the hole with 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
4 strokes with
Hilti blow-out
pump from the back of the
hole until return air stream is free of noticeable dust.
Manual Cleaning (MC):
Hilti hand pump is recommended for blowing out
boreholes with diameters d
0
≤ 20mm and borehole depth
h
0
≤ 10d
S
.
Annex 10
Installation instruction II
Clean bore hole – Automatic (AC) / Manual cleaning (MC)
