The opportunity: faster inspections, better documentation
The current inspection process
Contractors frequently inspect the site prior to pouring concrete. They walk the area by foot, make observations and any necessary changes, confirm final layouts and placements, and then begin pouring. They also bring in a city inspector and a special inspector for a final review of rebar and embedded elements. Having accurate aerial data and documentation can help speed up the inspection process and clear up any misunderstandings on-site.
Before pouring concrete slabs, subcontractors laid the rebar, cans, and PT (post-tension) cables needed in order to support the concrete. For those not familiar with concrete construction, PT cables are important because they enable thinner slabs of concrete to be poured, and allow for greater span lengths between support columns. They’re a vital part of modern concrete construction, with significant cost savings and greater flexibility.
The opportunity: faster inspections, better documentation
However, Since PT cables are tensioned after the concrete is poured, it can cause significant damage if they get hit. Contractors occasionally need to drill, core, or chip concrete, depending on the need. They typically do so to fix the placement of a can, which sometimes are out of place when the concrete gets poured. This is costly and time-consuming enough, but they also run the risk of accidentally hitting a PT cable, which can cause major structural issues, safety risks, and costly delays.
Pre-pour aerial inspections of PT cables
Solutions
1. Pre-pour inspections with 3DR Site Scan
The WEST Builders team discovered that they could streamline their inspection workflow by using drones — and the data and analytics that drone software provides — to collect aerial data and photos and easily share them with various inspectors and other stakeholders. This helped them quickly get a bird’s eye view of their job site, and it enhanced their final inspections to ensure they avoided mistakes.
PT Cable overlays using Site Scan
2. Post-pour PT cable documentation
The possibility of having to drill or core concrete creates a second key use case for aerial data: documentation of PT cables that can be referenced after the concrete has already been poured. This removes the need for using GPR or any sort of concrete scanning: WEST Builders captured detailed, high-resolution imagery that made it easy for them to document PT cables and know exactly where they would have to drill. The imagery from Site Scan can also be overlaid onto site plans and shop drawings, helping avoid costly errors and omissions in the field.
Significant savings, actionable aerial data
By regularly collecting useful, actionable aerial data, WEST Builders has made their inspection process simpler and more efficient, and can also safely pour concrete without worrying about having to drill and accidentally hit PT cables. This helps them minimize risk along their critical path and save time and money on-site, from start to finish.
Want to learn more about Site Scan? Visit 3DR.com