Projects · Package 01
Retaining wall
240 t tank base raft fixed over 5 weeks, water treatment, North West England.
- Water treatment
- North West England
- 5 weeks on site, as-built
What we
fixed
A tank base raft on a water treatment site, fixed as a single package from setting out to sign-off.
The raft was fixed as a double mat: bottom steel laid, spaced and tied first, then chairs and top steel worked off the same setting-out lines. Bar marks came off the client’s schedules and were checked against the drawing before each section was closed out.
Cover was held on proprietary spacers and chairs to the values on the engineer’s drawing. Laps were positioned to the schedule rather than the gang’s convenience, and starter bars for the tank wall were set and tied off before the pour so nothing had to be moved later.
Access was sequenced with the groundworker so the gang worked away from the concrete gang, and the raft was handed over as complete sections rather than one inspection at the end.
- Element
- Ground beams
- Tonnage
- 17 t
- Programme
- 2 weeks
- Sector
- Industrial
- Location
- East of England
How it ran
Four stages, worked back from the pour dates on the contractor’s programme.
Week 1
Setting out and bottom steel
Schedules checked against the drawing, setting-out lines agreed with the site engineer, bottom mat laid and spaced.
Weeks 2–3
Chairs and top steel
Chairs set to hold cover, top mat tied out section by section, laps positioned to the schedule.
Week 4
Wall starters
Tank wall starters set and tied off in position, so the wall gang inherited steel that did not need adjusting.
Week 5
Inspection and pour
Sections walked with the engineer, snags closed the same day, raft released for the pour on the programme date.
Scope and standards
What was in our package, and what it was worked to. Anything not listed sat with another trade.
- Package type
- Labour supply against the client’s steel
- In scope
- Bottom mat, chairs, top mat, wall starters, tying and spacing
- Not in scope
- Groundworks, formwork, concrete, steel supply
- Tonnage fixed
- 240 t
- Weeks on site
- 5
- Reinforcing steel
- BS 4449, grades B500B and B500C
- Bar shapes and scheduling
- BS 8666, to the client’s bar schedules
- Documentation
- RAMS issued before start; cards submitted with the package
Cover, lap and centre values are design values from the engineer’s drawings and are not published here. Client name withheld until we have sign-off to publish it.
Next on
the record
Retaining wall starters on a highways scheme, fixed to the formwork cycle. The full record lists element, tonnage, programme, sector and region for every package.
Need
steel
fixers
on site?
Send the drawings and bar bending schedules.
We come back with a price or a labour rate.