As-Builts Verification with Laser Scan

As-Builts Verification with Laser Scan

Posted by Ignacio Chiesura
Jan 19, 2022

One of the latest projects we have taken up at Corbis was a three-building creative mixed-use complex located in the heart of LA's fashion district.

For more than 50 years, this building has been regarded as the retailer's essential resource to discover fashion brands, housing hundreds of premier Women's, Men's & Children's lines, and the most comprehensive variety of fashion resources in the LA Fashion District. As part of a $170-million redevelopment plan, January 2020 welcomed a highly anticipated reopening of the newly renovated building.

Surveying the interiors of the building with Laser Scan.

Every project in this post-pandemic context shares the same pattern: a tight schedule and high pressure for go-to-market deadlines. The proverbial Napoleon quote “dress me slowly, I am in hurry” could not describe this better. The project developer leadership quickly realized the potential delay and cost-overruns that could come from assuming the as-builts as accurately reflecting the existing conditions.

Before engaging the architects that were to work on the design and drawings, Corbis was tasked with a fast-tracked laser scan of the spaces in the scope of this TI renovation, to confirm the accuracy of the as-built drawings.

The scan included the exteriors and interiors of the building for floors 2, 4, and 5. The key was to properly sequence the job to connect the scans. Being a vacant space made the coordination with the owner much easier than when dealing with occupied spaces and tenants.

To do the scan, we utilized the Leica RTC360 3D laser scanner to document and capture their environments in 3D, improving efficiency and productivity in the field and in the office and providing a very reliable color scan of materials and textures for future reference.

Leica RTC360 3D laser scanner

These FARO scanners have a new location technology that allows them to interconnect as you scan, without the need to place markers on site. This makes it a lot easier to scan each room or space and as long as each subsequent scan can “see” the other scan, then the magic happens: the software interlaces all the scans and “creates” the point cloud.

My biggest challenge this time was to mobilize the team in a short time frame, get the scan of all three levels right, coordinate the team at the office to review the scan vs the as-builts, and prepare a report for the client to quickly understand where the issues were.

Sitemap showing each scan location (CONFIDENTIAL PROJECT, Hollywood, LA)

The report was created including views of the 3D point cloud, pictures were taken with the scan, and portions of the drawings, for ease of understanding and sharing later with other project stakeholders.

On another job, a historical building in Wall Street (New Haven, CT), the job included transforming the point cloud into a BIM Model. The output is a true, accurate representation of the existing conditions in a digital BIM Model, for any further use -be it a renovation, a facility management implementation, or the assessment of the conditions for demolition.

Sequence of a project in New Haven, CT from Point Cloud to BIM Model.

The sequence shows the existing building, the point cloud captured with the scans, the BIM model created overlaying with the point cloud, and the end result: the accurate BIM model reflecting the existing conditions.

Another fulfilling experience working with Laser Scan to BIM was collaborating in a landmark building in LA. Under the command of a prestigious Project Management Firm appointed by the client to run the project, Corbis was brought to the team to do the reality capture and to create accurate base BIM Models of the existing conditions.

Point Cloud interior view of an iconic entertainment building in LA.

The scan included the exteriors and interiors of the complex, comprised of a geodesic dome of 316 interlocking concrete panels, as the centerpiece, a building with traditional theaters, a retail building, and a parking structure. The key was to properly sequence the job in coordination with the owner and the resident tenants, but also with the engineering group in charge of the cinema buildings, as the lights are centralized and they had to turn on/off lights for proper color scanning.

A job like this would have taken months to develop with a traditional survey, and representing the existing conditions of such a complex building would have been extremely difficult and likely quite inaccurate. With laser scan and BIM modeling, we were able to do the whole job in less than 8 weeks, delivering buildings in the sequence required by design priorities, to help the project move smoothly and within schedule, knowing the architects will now have a reliable base for their design and delivery work.

Do you want to learn more about reality capture/Laser scan and BIM Modeling of existing conditions?

Converting a project's Point Cloud, surveyed with Laser Scan into a BIM Model.

Let’s talk, we can set up a meeting at your convenience, go through all the benefits of surveying an existing building and prepare BIM model for your project.

CATEGORIES: CorbisStudio