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Drill hole cleaning
Manual Cleaning (MC)
Compressed air cleaning (CAC) For all drill hole diameters d
Compressed air cleaning (CAC) For all drill holes deeper than 250 mm (for ϕ 8 to ϕ 12) or deeper than 20·ϕ
04 / 2016
The drill hole must be free of dust, debris, water, ice, oil, grease and other
contaminants prior to mortar injection.
Just before setting the bar, the drill hole must be free of dust and debris
by one of two cleaning methods described below.
Inadequate hole cleaning = poor load values.
For drill hole diameters d
Blow at least 4 times from the back of the drill hole until return air
stream is free of noticeable dust.
Brush 4 times with the specified brush by inserting the steel brush
Hilti HIT-RB to the back of the hole (if needed with extension) in a
twisting motion and removing it.
The brush shall produce natural resistance as it enters the drill hole
(brush Ø ≥ drill hole Ø) - If this is not the case, please use a new
brush or a brush with a larger diameter.
Blow at least 4 times from the back of the drill hole until return air
stream is free of noticeable dust.
Blow 2 times from the back of the hole (if needed with nozzle
extension) over the whole length with oil-free compressed air (min. 6
)
bar at 6 m³/h
until return air stream is free of noticeable dust.
Brush 2 times with the specified brush by inserting the steel brush
Hilti HIT-RB to the back of the hole (if needed with extension) in a
twisting motion and removing it.
The brush shall produce natural resistance as it enters the drill hole
(brush Ø ≥ drill hole Ø) - If this is not the case, please use a new
brush or a brush with a larger diameter.
Blow 2 times again with compressed air until return air stream is free
of noticeable dust.
If required use additional accessories and extensions for air nozzle
and brush to reach back of hole.
(for ϕ > 12 mm)
Use the appropriate air nozzle Hilti HIT-DL.
Blow two times from the back of the hole over the hole length with oil-
free compressed air until return air stream is free of noticeable dust.
Safety tip:
Do not inhale concrete dust.
Use of the dust collector Hilti HIT-DRS is recommended.
Hilti HIT-RE 100 mortar w/
rebar (as post-installed conn.)
≤ 20mm and drill hole depths h
0
and all drill hole depths h
0
≤ 10·d.
0
≤ 20· d
0
5
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