In brief
- Supervision gaps in rebar bending show up as wrong bar geometry that is buried in concrete before anyone measures it.
- Ask for the bar bending schedule, bench checks and cover readings before the pour, not after.
- A named checker with the schedule in hand is the cheapest fix on a Qardho site.
Contents
Rebar bending supervision gaps in Qardho let incorrect bar geometry reach the pour, and once concrete covers the steel the error is permanent. The check is simple: compare the bars on the ground against the bar bending schedule, with a tape and a level, before the formwork closes. Supervision fails when nobody owns that comparison.
Where does the supervision gap start?
The gap starts when the steel fixer works from memory instead of a checked bar bending schedule. A schedule sets each mark, bar size, shape, crank length and lap. If the drawing set is incomplete or the schedule was never issued for construction, the fixer decides shapes on site, and the checker has nothing to measure against.
On a busy Qardho site the supervisor may be covering several plots or splitting time between procurement and inspection. Rebar work then runs without a hold point. Ask the project manager which document the fixer is bending to, who issued it, and when it was last revised. Ask the local permitting authority which structural drawings it requires for a permitted build. Confirm the lap lengths and bend diameters against the project's specification or engineer, since these are general practice and vary by bar size, grade and code.
What goes wrong in the steel?
Four defects pass most often when supervision is thin: wrong lap length, bent corners that do not close, stirrup spacing that drifts, and cover that varies from face to face. Each one is measurable only before the pour.
A lap left short cuts the load path at the point of maximum tension. A column starter bent at the wrong radius can crack at the bend. Stirrups placed by eye leave a wide gap in a shear zone. Cover lost at one face leaves steel exposed to moisture and salt, so confirm the exposure conditions for the plot and the cover the project's specification or engineer requires. Bars also get cut short when the cutting list is verbal. Set a hold point: the fixer stops, the checker measures laps, crank lengths and stirrup spacing against the schedule, and both sign a short record. Photograph the steel with a tape in frame before the formwork closes.
How do you catch it before the pour?
Catch it by walking the steel with the bar bending schedule in hand and a tape, not by trusting a progress photo. Work mark by mark from the schedule and tick each one.
- Measure three laps per member and write the numbers down.
- Check every bent bar against the schedule shape, including cranks and hooks.
- Count stirrup spacing over a full bay, not one gap.
- Use cover blocks and check the gap at each face with a tape.
- Confirm the fixer has the current drawing revision, not a superseded sheet.
Ask the site for its rebar inspection record for the last completed slab and check whether it was signed. General practice is to record the check, the date and who signed it, and to confirm acceptable tolerances against the project's specification or engineer rather than a site rule of thumb.
What to do next
Pick the next pour on your project and set a rebar hold point before it: the fixer stops, you or your engineer walks the steel with the bar bending schedule, measures laps, spacing and cover, and signs a one page record with photos. If the schedule is missing, ask the designer to issue it before tying starts.
Frequently asked questions
Who should check rebar before a pour in Qardho?
Name one person, usually the site supervisor or the project engineer, who holds the bar bending schedule and signs a record after measuring laps, stirrup spacing and cover. The client can ask to see that record.
What if the bar bending schedule is missing?
Ask the designer to issue a checked schedule before tying starts. Without it the fixer bends from memory and no one can verify bar geometry against a document.
Local reporting: this article is written for building work in Qardho and Puntland. Ground conditions, prices and rules differ between places; confirm the details for your own site.