Why Scan Concrete Before Core Drilling in Dubai

Core drilling is a committed cut. Once the barrel is in the slab, you cannot unread what it hits. Concrete scanning is the step that shows rebar, post-tension cables and sometimes conduits before that happens. On Dubai towers it is the difference between a moved mark and a stopped floor.

We treat concrete scanning as part of the same conversation as the drill, not as a separate trade the main contractor has to remember later.

What the scan is looking for

Ground-penetrating radar, used by a technician who reads concrete rather than just a screen, is there to map steel. Ordinary rebar tells you the hole will be slower and the bit will wear. A post-tension tendon tells you the hole may have to move. A live conduit tells you the penetration was drawn through someone else’s service.

The useful output is not a vague “slab is reinforced”. It is marks on the concrete: drill here, do not drill here, and the depth the reading is confident about.

When to book it

• The drawing says post-tension, or nobody can find the drawing
• The hole is in a transfer slab, a beam, or a waffle rib
• The floor is occupied below, and a burst conduit would be serious
• The consultant has asked for a report before approving centres
• You are stitch-drilling a large opening and every core is another chance to hit steel you cannot afford to cut

A single 50 mm hole in a block wall with a clear drawing is a different decision. Scanning everything by habit is wasteful. Skipping it on a PT slab is not a saving.

How it should sit in the programme

If the consultant must approve the marks, scan first and drill later. If the engineer is on site and can accept a shifted centre, scan and core drilling can be the same mobilisation. Say which one you need when you book, because the second case only works when someone with authority is there to move the mark.

Our note on post-tension slabs covers what to ask the structural engineer before the crew arrives.

What to do with the marks

Photograph them. Do not let the next trade mop them off. If a centre moves, update the drawing the MEP coordinator is using, or the next floor will be set out from the old point. The driller should be allowed to stop if the cuttings do not match the scan. Pushing on “because the sleeve is already fabricated” is how tendons get cut.

Send the slab type and a photo of the set-out when you ask for a scan and drill quote. If you only need the survey, say that too.

Common questions

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