On November 29th, 2016, Ground Penetrating Radar Systems (GPRS) was requested on site by a general contractor to perform a Ground Penetrating Radar (GPR) survey at the Akron Children’s Hospital in Akron, Ohio. The contractor needed to saw cut and remove 2”-3” of the slab in multiple areas. The contractor needed to know where the top and bottom rebar was as well as how deep they were to determine how much reinforcement would need to be removed. GPRS located and marked the rebar with depth indications in the area of concern. The contractor was told that the top rebar was 3” deep. GPRS advised that the top rebar was only 1.5” deep. The contractor was able to chisel down to expose the top rebar and confirmed that the rebar was only 1.5” deep. Thanks to GPRS, the contractor was able to approve a 1” cut to prevent the rebar from being saw cut. Call GPRS before you saw cut or core drill the concrete to prevent reinforcement or conduits from being hit!
Below are pictures of the areas scanned with the top (dashed lines) and bottom (solid lines) rebar marked on site.
Ground Penetrating Radar (GPR)
- GSSI SIR – 3000
- GPRS uses a Geophysical Survey Systems Inc. (GSSI) SIR-3000 Radar unit. This is the most advanced GPR available. It allows for onsite interpretation, as well as stores data for later processing. This equipment is self-calibrating, allowing more precise depth and location measurements.
- 1600 MHz Antenna
- This antenna allows data collection to a maximum depth of approximately 18”, depending on concrete conditions
Ground Penetrating Radar Systems is the best way to ensure the locations of reinforcement and conduits prior to saw cutting/drilling through concrete. For more information on how GPRS, Inc. can help you on your next project, please contact Micah Stair at 330-639-8933 or by email at firstname.lastname@example.org. We also have the capabilities of locating underground utilities, UST’s, and voids.