How do you check prop removal before a slab is loaded?

A prop removal skills gap in Bosaso does not announce itself. A slab or beam looks hard, the props come out early, and the load that follows, blockwork or screed or tiles or a water tank, lands on concrete that has not reached its specified strength. Early striking can cause deflection or cracking, and may leave repair work that the engineer of record has to assess.

What does premature structural loading actually do?

Concrete gains strength over days and weeks, and the props carry the wet weight until the concrete can carry it. General practice ties removal to the strength the project's specification or engineer requires, and that strength is confirmed by cube or cylinder tests, not by how the surface feels. Ask the engineer what strike strength the design uses. When props release before that strength, the slab can sag under its own weight before any floor finishes arrive, and early loading adds stress that the young concrete was not checked for. Cracks can start at supports, run across the soffit, or open at the top of a beam. Some damage closes and hides. Deflection may stay. The engineer of record decides whether the element needs monitoring, propping or repair, and that assessment depends on records, so the check is documentary: pour date, test results, strike date and the person who authorised the strike.

How can a prop removal skills gap turn into early striking?

The gap can sit in planning and authority rather than in muscle. One crew may fix and strip the formwork under time pressure from the next trade, with no named person checking test results first. Where props are hired and the hire period is tight, release pressure can build, and where the shutters are needed on another job, they can go back before the concrete is ready. A supervisor who has never seen a striking record may work from the pour date alone, so ask the site team how strike decisions are recorded and who signs them. A reader can check the local situation: ask the municipal engineer's office what documentation it expects for suspended slabs, and ask the project's testing laboratory how long it takes to return cube results. That answer tells you whether a strength-based strike fits the programme here. A test record that arrives after the props are gone has no value.

What competence should a supervisor verify before striking?

Competence shows in records and in the sequence on site, not in years served. Ask for a method statement that names who authorises each strike and what test result is needed. Core boxes and isolated props may follow different rules from a full bay, so the stripping sequence belongs in the drawing set, not in a foreman's memory. Curing needs checking against the project's specification and the engineer's instruction: concrete that dried out early can test lower than expected even when the mix was correct, so ask who kept the slab wet and for how long, and whether the specification calls for anything different under the site's conditions. Walk a recent site of suspended slab work and watch a strike. Note whether props are released in the planned order, whether the slab is protected from early loads, and whether the record is filled in on the day or reconstructed later. Also confirm what the contract says about testing, records and hold points, because that is what you can hold the work to.

What to do next

Pick one suspended slab on the job. Ask the site team for the pour date, the cube results, the specified strike strength and the signed striking record, and check that the strike date follows the test date. If any of those documents is missing, stop the next strike and ask the engineer of record to confirm the requirement in writing before props are released.