In this guide 6 sections
Schedule precast work backwards from the delivery date on the dispatch plan. For each element, set the stripping time, the curing hours the mix needs, the pour slot, the mould and the bed. Then check that no mould or bed is double booked, and that rebar cages and inserts arrive before the pour.
Start from the delivery date, not the pour date
A precast plant sells delivery dates. The site crane is booked, the trailer is booked and the erection crew is waiting. So the schedule starts at the date an element must leave the yard.
Count backwards. Take the loading day, then the days the element must sit in the stockyard for final curing and inspection. Then take the strip date, the curing hours and the pour date.
Write each step in its own column. A planner who sees only the pour date cannot spot that a slab will still be wet on the day the trailer arrives. Add the column.
- Project and element mark, such as beam B14 or wall panel WP-07
- Site delivery date and trailer slot
- Stockyard days before loading
- Strip date and target strength at stripping
- Pour date and bed number
Treat each mould as a limited asset
A steel mould for a hollow-core slab or a double tee costs real money and takes weeks to fabricate. Timber and fibreglass moulds wear out after a set number of casts. Your sheet should count them.
Give every mould a code, a cast count and a repair flag. When a mould has served twenty casts and the surface is rough, the planner should see it before it spoils a visible face.
Reuse is where the schedule earns its keep. One mould cast twice a week finishes a project far sooner than three moulds sitting idle beside a bed that is still curing. Count them.
Plan curing hours as a block that cannot be cut short
Curing hours depend on the mix, the weather and whether the bed has heating or steam. A winter pour with an accelerator behaves very differently from a summer pour with a retarder.
Do not give every element the same curing time. Record the mix code, the target stripping strength and the cube test result that releases the element. Hours alone are a guess.
Keep the cube crushing slot in the plan. If the lab result is late, the bed stays blocked. That delay should show on the schedule, not surprise the next pour, the crane crew and the trailer driver waiting at the gate.
- Mix code and admixture used
- Curing method: ambient, covered, steam or heated bed
- Cube test date and strength reading
- Release signed by the quality engineer
- Bed free time after stripping and cleaning
Check the clashes before you release the plan
A schedule fails in a few predictable places. Two elements want the same bed. A mould is under repair. A rebar cage is still at the bending shop. Cast-in sockets or lifting anchors have not arrived.
Add a readiness column for each pour. It should show cage, inserts, embedded conduit, mould clean and release agent applied. A pour with an empty cell stays off the plan.
Short sentences help here. Is the crane free at the strip time? Is the bed cleaned? Is the next mould waiting? Each question gets a yes or a name.
Move from a sheet to a system when the sheet breaks
A spreadsheet is fine for one yard with a few beds. It starts to fail when planners edit it in parallel, when a project change shifts forty elements, or when the yard office cannot see the shop floor status.
Software helps most with linking the pieces. A pour record points to its mould, its bed, its mix, its cube results and its delivery slot, so a change in one place updates the rest.
Start this week by copying the column list above into a sheet and filling one project. Count how many beds the next fortnight really needs.
Precast bed and curing planner
A single sheet listing every element on its own line. Columns run from element mark and project to delivery date, stockyard days, strip date, curing method, cube test result, pour date, bed number and mould code. A second block lists moulds with their cast count and repair flag. A readiness strip at the right shows cage, inserts and release agent as ticks.
Open a blank worksheet to printQuestions owners ask
How do I decide how many beds a precast yard needs?
List the elements due in the next four weeks, their pour dates and their curing blocks. Count how many beds are occupied on the busiest day. That number, plus a spare for repairs, is your working need.
Should curing time be the same for every element?
No. It depends on the mix, the weather, the curing method and the strength needed at stripping. Record the cube result that releases each element and use hours only as a planning estimate.
How do I track mould reuse?
Give each mould a code and add one to its cast count at every pour. Flag it for inspection at a set count and when the face finish starts to degrade.
When is a spreadsheet no longer enough?
When several people edit the plan at once. When one project change moves many pours. When the yard office cannot see which beds are free.