
ETA 19/0665 v03 of 22/01/2020 page 13 of 18
Splicing applications
Measure and control concrete cover c.
c
drill
= c + d
0
/2.
Drill parallel to edge and to existing rebar.
Where applicable use Hilti drilling aid HIT-BH
.
Drilling aid
For holes l
b
> 20 cm use drilling aid.
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
Drill hole cleaning
Just before setting the bar the drill hole must be free of dust and debris.
Inadequate hole cleaning = poor load values.
Manual Cleaning (MC)
For drill hole diameters d
0
≤ 20 mm and drill hole depths l
b
≤ 10
ϕ .
The Hilti hand pump may be used for blowing out drill holes up to diameters
d
0
≤ 20 mm and embedment depths up to l
b
≤ 10 ϕ .
Blow out 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 (see Table B6) 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 out again with the Hilti hand pump at least 4 times until return air stream is
free of noticeable dust.
Annex B8/2
of ETA N° 19/0665
Intended Use
Installation instructions