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Concrete Bridge Scanning for Rebar - St. Louis, MissouriConcrete Bridge Scanning for Rebar - St. Louis, Missouri

Ground Penetrating Radar Systems, Inc. (GPRS) was contacted by a local contractor to perform a GPR scan at the Poplar Street Bridge in St. Louis. The contractor needed to locate rebar in pier 2 and 5 in order to anchor into each side without hitting any rebar. The company contacted GPRS of St. Louis in order not to hit any rebar or unknown utilities in the column walls. GPRS performed GPR in the areas of concern the contractor indicated.

Isaiah Runkle of GPRS was contacted in order to perform the survey at this location. Using our 1600MHz antenna radar equipment, we were able to map out rebar, and any other anomalies which were running through the areas of concern. GPRS was able to find locations that were clear of rebar, conduit or any unknown utilities in order for the contractor to drill in anchor bolts. The client was pleased with our results and felt relieved that they were able to work in the areas knowing where any rebar, conduit or any other anomalies were located. We scanned each area in a north/south, east/west pattern at each location. All findings were marked out directly on the surface with marker. Each anomaly was labeled accordingly with a depth to the top of each anomaly. The findings were explained clearly to the onsite contact, and GPRS was able to recommend the best path to drill in anchors safely.

Upon arriving onsite, Isaiah met with the site contact and went over the areas of concern that needed to be scanned with GPR. The areas needed to be clear of debris and clearly marked. The contractor needed to drill into column walls that were approx. 12’ thick, and reinforced with heavy rebar. In order to reach the locations to perform the scan, we needed a boom lift. The contractor provided a boom lift and operator to reach these areas. The contractor marked out each location on the surface with a chalk line marker. Each anomaly was labeled accordingly such as unknown, conduit, power or communications. After the scan, Isaiah explained the findings of the scan to the contractor, and advised where to drill in order so they would not hit anything prior to anchoring to the column walls.

Below is a photo taken on-site which depicts Isaiah locating any rebar or unknown utilities located in the area of concern. Isaiah was on a boom lift that was provided and operated by the contractor. Isaiah was wearing his safety harness and was tied off correctly in order to perform each scan. If you have a need for utility locating or concrete imaging prior to core drilling or saw cutting contact, Isaiah Runkle (314-412-9806) or Isaiah.runkle@gp-radar.com who works out of the St. Louis office and covers the greater St. Louis area. GPRS is your GPR resource, so feel free to contact us with any questions or concerns on current and future projects.


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