HandoverHandover: The last month…
Before it's buried
Stevie, the site engineer, surveys from the ground while the trenches are open: the cable, and the manhole that moved 1.2 metres to dodge it.
Stage 6 · Hand it over · Stop 1 of 6 · The right way
As-built
The back alley's bill so far: 140 weeks · See the bill
The right way
Measured, not stamped
Drawing 042 goes back on the published shelf as the record of what's really built. Its label says C03 and A6.
Stevie: Measured. Not stamped.
In useIn use: Two years later…
First time
The crew digs where the record says the manhole is. It's there. They're home for lunch.
StampedForty drawings in an afternoon, and a manhole under a van.
MeasuredSurveyed before backfill, and found first time.
Now there is: Measured, not stamped (the as-built record, carried into the asset information model).
What's going on here
The record of what was built is only worth anything if it was measured. Changes made on site, like a manhole moved to dodge a cable, have to reach the drawing before the trench is filled in. A stamp on a design drawing is a promise nobody checked.
New at this stop
- Measured, not stamped
- The record of what was really built, from surveys, not a design drawing with AS BUILT stamped on it. (The as-built record.)
In the town See it in the town: what does a tape measure know that a stamp doesn't?
Drawing 042 has lived on the published shelf all year as an A5, telling people what to build. Now it has to go back on the shelf as the truth about what was built: C03, A6, measured, not stamped. Stevie's survey while the trenches are open catches the manhole that moved 1.2 metres to dodge the cable, so the record matches the ground. That record leaves the Site Office as part of the data the owner runs on, and two years later it sends the crew straight to the right spot.
Fix it Stamping AS BUILT? Put the stamp down.
- List every site change that hasn't reached a drawing yet.
- Survey anything still open before it is backfilled.
- Mark each record drawing with what it was measured from.
A note for the information manager: Put survey before backfill on the parts list as a named task with a date, because once the trench is filled the only evidence is somebody's memory.
Try it on your job
Pick one drawing marked as built on your job. Can anyone show you what it was measured from?
ISO 19650 From the drawing to the owner's record
| ISO 19650 says | Means | In the town |
|---|---|---|
| Project information model (PIM) | All the information about the job built up during design and construction, including what was actually put in the ground | The information model in the Site Office |
| Asset information model (AIM) | The information the owner keeps and uses to run and maintain what was built | The data the owner runs on |
| Asset information requirements (AIR) | What the owner needs to know about each asset, which the record of what was built has to satisfy | Measured, not stamped |
Based on the ISO 19650 series: the ideas come from the standard; the plain-English wording, examples and advice are InfoTown's. ISO 19650 and its UK National Annex are © ISO and BSI. You'll hear the same language across the industry. Read more for free in the Information Management Initiative (IMI) Framework guidance from BSI and nima. For the full requirements, use the standard itself.