Hilti HIT-RE 500 V4 Mode D'emploi page 20

European technical assessment E T A - 2 0 / 0 5 4 1
English translation prepared by CSTB
Drill hole cleaning:
Compressed Air Cleaning (CAC): For all drill hole diameters d
Injection system Hilti HIT-RE 500 V4
Intended use
Installation instructions
Just before setting the steel element, the drill hole must be free of dust and debris.
Inadequate hole cleaning = poor load values.
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.
For drill hole diameters ≥ 32 mm the compressor has to supply a minimum air flow of
140 m³/h.
Brush 2 times with the specified brush (see Table B8 and 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
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Annex B10