In brief
- A low column alignment bid often omits survey time, setting-out checks and hold-down points rather than pricing the work cheaply.
- Ask for the setting-out method, the survey instrument and the inspection points before comparing totals.
- Eccentric loading comes from columns placed off the grid line, and it shows up later as cracking and uneven load paths.
Contents
A low column alignment bid in Garowe can hide omitted work rather than a lower price for the same job. The risks a Garowe client should look for in a low column alignment bid are missing survey time, missing setting-out checks and missing hold-down points. The total looks small because the bidder has left out the steps that keep columns on the grid line.
What work does a low column alignment bid leave out?
The usual omissions are survey, setting out and re-checking. A complete alignment price covers establishing the grid, marking each column position, checking the starter bars against that mark, and holding the column while concrete sets. A low bid can drop the survey instrument, drop the second check before the pour, or drop the brace that stops the column moving.
Look for these gaps in the priced method:
- No line item for setting out or a survey check.
- No allowance for re-checking positions after the pour.
- No bracing or template in the method statement.
- Only one person named for setting out, with no independent check.
- Column positions taken from a wall line rather than from the approved grid.
Ask the bidder to show the method statement and the inspection points for each column. If the method has no check before the pour, the omission is in the bid, not in the price level.
How does eccentric loading start at the setting-out stage?
Eccentric loading starts when a column sits off the grid line and the load no longer passes through the centre of the support. A small offset at the base grows as the column rises, and the beam or slab above then carries a turning force the design did not plan for. The defect comes from the setting-out stage, not from the concrete.
General practice is to set out from the approved grid, mark each column, check the mark before fixing the starter bars, and check again before the pour. Confirm the tolerances and the number of checks against the project specification and the structural engineer, because they vary with the frame type.
In Garowe, you can ask the municipal engineer's office what records exist for the site, and walk a recently completed building to see how columns meet the grid line. Compare the positions with the approved drawing. A frame that leans away from the line over two or three floors shows the setting-out gap before any crack appears.
How do you close the gap before you award the work?
Close the gap by pricing the checks as separate items and naming who signs each one. Ask every bidder to break out setting out, survey, templates or bracing, and the pre-pour check as their own lines. When those lines appear, the totals become comparable and the missing work shows up.
Then agree the hold points in writing. State who inspects, what they record, and what happens if a column is out of position. Check what the contract allows for rework and for a rejected pour before you sign, rather than deciding later.
Ask two bidders for a written method statement and a written quote for the same scope, then compare the check lists side by side. A laboratory or survey firm can confirm what a setting-out check costs, and its written rate gives you a figure to compare. Do not rely on a verbal assurance that the checks are included.
What to do next
Request the setting-out method and the inspection points in writing from every bidder before you compare totals. Make the pre-pour column check a named hold point in the contract, and ask the municipal engineer's office what records exist for the site. Walk one recent building and compare its columns with the approved grid line.
Frequently asked questions
Does a low column alignment bid always mean the work is missing?
No. A bidder can be efficient and still price the full method. Check the written method for survey, setting out, bracing and a pre-pour inspection point. If those steps are absent, the low total reflects omitted work rather than a cheaper way of doing the same job.
Who should sign off column positions before a pour in Garowe?
The contract should name the person who inspects and records each column position before the concrete goes in. Ask the structural engineer and the municipal engineer's office which records they expect, then write that name into the hold point list before work starts.
Local reporting: this article is written for building work in Garowe and Puntland. Ground conditions, prices and rules differ between places; confirm the details for your own site.