GPRS Enterprises Inc. of British Columbia was contacted by a local solar panel installation company who was planning on drilling anchor locations into multiple areas of a suspended slab prior to installing new office walls and dividers. The client had been previously informed that the building was heating using radiant heating floor tubes, and hot water. Radiant tube heating systems are very popular in British Columbia, and many small businesses, condos, and houses use this system due to its efficiency and cost savings when compared with central air heating. GPRS mobilized to the site the morning after receiving the call, and completed the survey of the entire 60’ proposed wall area in under an hour. After more thorough inspection of the underside of the slab, along with unique data results, it was determined that the slab consisted of hollow core panels. Each panel contained hollow spaces, with pre-stressed cable reinforcement in between, instead of typical rebar. There was also a wire mesh reinforced topping slab in addition to the hollow core structural, which was where the heating tubes were located.
The photo above shows the first proposed wall section that was surveyed. Details of the slab were marked next to the layout, as this was a more unique type of slab that needed extra communication between GPRS and the client. Red markings note the location of heating tubes in the floor, as shallow as 2” in some areas. Even though anchors were only 1 ¼” long, we took the extra time to mark the pre-stressed cables and hollow areas in the structural slab for further clarification. Hollow core slabs save weight and cost compared to typical rebar or post tension slabs, and are popular in shopping mall and tilt-up style construction.
The photo below shows the data gathered on site which was first taken perpendicular to the hollow and cable orientation, and then parallel (divide of two scans at approx. 60”). Radiant heating conduit is highlighted with red arrows, hollow cores with yellow, and cables in the panel slab with blue arrows. The hollow cores and cable only run in one direction (lengthwise) within each panel, and therefore cannot be viewed in the parallel scan.
Avoid potential safety risks, costs, and frustrations, and gain peace of mind by having us survey your locations prior to drilling, cutting, coring or destructively testing. GPRS can be on site within 24 hours of a request in order to keep these important concrete drilling/cutting projects running smoothly.
If your company is in need of any of our concrete scanning services which include plastic or steel conduit location, rebar locating, post tension cable locating, concrete void detection, or buried drain and utility location in the Lower Mainland or greater Vancouver area, please contact:
Jesse Moorhouse at (604) 671-1829 or at email@example.com.