Installation Guide

ManualsBrandsHilti ManualsTools & Hardware3/4 in. x 11 in. HAS-E Threaded Steel Rod (10-Piece)

3. Borehole cleaning

Load performances of chemical anchors are strongly influenced by the cleaning method. Inadequate borehole

cleaning = poor load values. For safety relevant applications, please verify with the design engineer

which cleaning method was assumed in the design phase. The borehole must be free of dust, debris, water when

applicable, ice, oil, grease and other contaminants prior to mortar injection.

•

Blow from the back of the borehole with oil-free compressed air [min.

90 psi at 3.5 CFM (6 bar at 6 m

/hour)] until return air stream is free of

noticeable dust. Perform this step 2 times.

•

For boreholes deeper than 250 mm (10") (for d

= 8 mm (3/8") …12 mm

(1/2")) or deeper than 20xd

(for d

>12 mm (1/2")), respectively, use the

appropriate air nozzle Hilti HIT-DL (oil free compressed air ≥ 6 bar) – see

Table II for the corresponding air nozzle / drill bit combination.

•

Connect the selected air nozzle with the appropriate air cleaning exten-

sion:

HIT-DL 12–16 (HIT-DL 1/2" – 11/16") with HIT-DL 10/0.8 or HIT-DL V10/1

HIT-DL 18–32 (HIT-DL 3/4" – 1 3/8") with HIT-DL 16/0.8 or HIT-DL B and/or

HIT-VL 16/0.7 and/or HIT-VL 16.

See Table II for the corresponding air nozzle / drill bit combination.

For applications with an effective embedment depth 

inst

> 0.7 m (28"),

please connect two or more blowing extensions HIT-DL with the connect-

or HIT-DL K (See Table IV).

For element diameter > 25 mm (1") the compressor must be rated to sup-

ply a minimum air flow of at least 140 m

/hour (82 CFM).

Tips:

•

Keep away from dust cloud, do not inhale concrete dust.

•

Hilti recommends a dust collector or other equipment to be used to col-

lect the dust during the blowing operation.

•

Brush the borehole with an appropriately sized round steel brush. Per-

form this step 2 times.

•

See above for details.

•

Blow out the hole again from the back of the hole with compressed air

until return air stream is free of noticeable dust. Perform this step 2 times.

Compressed air

Brushing

Compressed air

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