Its a Monster!

This is the biggest scanning project I have completed so far. Its back at the warehouse at Brisbane Airport which was featured in an earlier post.

BAC Warehouse. Brisbane Airport.

BAC Warehouse. Brisbane Airport.

I was contracted to scan the entire warehouse to capture detail in the first 20m of the roof as the whole building is in desperate need of roof strengthening. The bracing had to be captured along with all of the existing services and all of the purlins in the first third of  the roof.  I used 2 scanners and drafted my son to help. 15hrs of scanning later and 105 scans my poor HP workstation was put to work. Another day later and we had a registration within 3mm!

I had to down-sample the 2.5 million points to help my workstation. The resulting images are a bit grainy but you will see how large the warehouse is.

The job was not without problems. Firstly you get a lot of data and if you don't watch out in Trimble Realworks you end up with even bigger files and mine crept up to 85GB. Secondly I learned that if your target placement is a bit more regular than you intended Realworks struggles to pick one target from another. So in future be very random about target placement. Thirdly we found that using Realworks' Auto-extract Targets and register function we got 2 targets with the same number. We don't know how but it took about 5 hours head scratching to work it out. Lastly we could see that the scanning of this building shows all of the major problems with a scary reality. For example all building rafters can sag a little. The scan shows that in this buildings case its over 120mm and it stands out like a sore thumb.(See below).

Rafter Sag

Rafter Sag

The data has now been extracted and inserted into a Tekla Structures model for the new steel to be detailed. It will be a month before I have to go to site to set it out so I will report back once the steel starts going in.

Below are a couple of screen grabs showing the color point cloud in Tekla. This makes it so easy to convey all of the necessary information to the draftsmen that have to fit steel to this frame. it is also invaluable in helping the draftsmen avoid clashes for the beginning. Problems can be identified and solved before the steel is even ordered.