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European technical assessment ETA-0 8 / 0 2 0 2
English translation prepared by CSTB
Splicing applications
Drilling aid
Drill hole cleaning
Compressed Air Cleaning
(CAC) for hammer drilled holes
Injection system Hilti HIT-HY 150 MAX
Product description
Installation instruction
Measure and control concrete cover c.
c
= c + d
/2.
drill
0
Drill parallel to surface edge and to existing rebar.
Where applicable use Hilti drilling aid HIT-BH.
For holes l
> 20 cm use drilling aid.
v
Ensure that the drill hole is parallel to the existing rebar.
Three different options can be considered:
Hilti drilling aid HIT-BH
Lath or spirit level
Visual check
Just before setting the bar the drill hole must be free of dust and debris.
Inadequate hole cleaning = poor load values.
For all drill hole diameters d
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 (see Table B9) 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 must produce natural resistance as it enters the drill hole
(brush Ø ≥ drill hole Ø) - if not the brush is too small and must be replaced with
the proper brush diameter.
Blow again with compressed air 2 times until return air stream is free of
noticeable dust.
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and all drill hole depths h
0
Annex B12
≤ 20 · ϕ.
0
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