Concrete Scanning used to Locate Pre-Stressed Cables Prior to Core Drilling Holes inside a Nursing Home in Ann Arbor, MI

Ann Arbor Cover

It’s always essential to have as much information as possible prior to making any floor penetrations. There are many unknowns prior to core drilling holes in an elevated slab such as what type of reinforcing steel is present, potential for beams being in the area & embedded conduits possibly passing through proposed coring locations. Ground Penetrating Radar (GPR) is an excellent source to provide some answers to those unknowns.

A general contractor had a project inside a nursing home being renovated in Ann Arbor MI where they had to core drill numerous holes in an elevated slab. The nursing home was being transformed in to an updated space for the residents. The new plans had bathrooms, sinks & janitor closets that were going to be added along with numerous floor boxes. The contractor had to connect the new plumbing to the existing plumbing on the floor below. They also had to connect new electrical for the floor boxes. Before making any floor penetrations, the contractor needed to know the type of floor that was present & if any existing utilities were in the slab. Ground Penetrating Radar Systems of Ann Arbor MI was contacted to scan the areas for the future floor penetrations. While scanning in real time, GPRS was able to determine the concrete slab was of hollow core construction. That was important information since hollow core slabs have pre-stressed cables that run in the grouted portions of the slab. It’s essential to avoid cutting any pre-stressed cables when core drilling since doing so would compromise the structural integrity of the floor & could potentially injure the drillers. GPRS was able to mark the hollows directly on the surface & explained to the plumbers to core drill in the hollow portions (labeled by the H). The project was able to continue without having any setbacks.

Ann ArborIt’s always a good practice to scan prior to core drilling or saw cutting concrete structures. Please contact Regional Manager of Michigan, Thaddeus Bullock, for more information on the capabilities of GPRS at 734.377.4551 or Thaddeus.bullock@gp-radar.com.

 

GPRS Locates Electrical Conduits at Kent State University

On December 19th 2016, Ground Penetrating Radar Systems (GPRS) was requested on site by a general contractor to perform a Ground Penetrating Radar (GPR) survey at Kent State University.  The contractor needed to saw cut a trench to install new sanitary lines to replace the existing sanitary.  The contractor needed to know if there were any conduits in the area to avoid saw cutting through them.  GPRS located many live electrical conduits that would have been damaged during saw cutting operations.  The conduits were painted on the surface with depth indications so that the contractor could safely saw cut over or around them without hitting the conduits.  The site had no knowledge of the electrical conduits found.  Without GPRS on site, there could have been serious damage to the electrical lines.  Before you saw cut or core drill, call GPRS to know what’s underground!

The picture below shows live electrical conduits in red along with the contractor’s saw cutting in orange.

Kent State University1
Kent State University2

Equipment

Equipment

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 micah.stair@gp-radar.com.  We also have the capabilities of locating underground utilities, UST’s, and voids.

GPRS Locates Rebar at the Akron Children’s Hospital

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.

GPRS Locates Rebar at the Akron Children’s Hospital1

GPRS Locates Rebar at the Akron Children’s Hospital2

Equipment

Equipment

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 micah.stair@gp-radar.com.  We also have the capabilities of locating underground utilities, UST’s, and voids.

GPRS Ensures Safe Excavation

Ground Penetrating Radar Systems (GPRS) Inc. of Pittsburgh was contacted by the owner of a private residence to locate utilities on the property to ensure safe excavation for the installation of a retaining wall around the driveway.

Ground Penetrating Radar (GPR) was used to locate the existing gas lines from the valve near the street to the gas meter at the house.  The GPR was able to clearly see 4 feet into the ground to locate the line at 2.5 feet.  A foreign line was also located which, when excavated, turned out to be an inactive gas line that was previously replaced.  Both of these lines crossed into the work area which, if left undetected, could have potentially led to a dangerous accident.

For this residential utility locate job, the GPRS technician also used radio detection and induction methods to locate the water line and sewer lines into the home.  These methods require the technician to directly connect to a conduit with wire passing through it or a metal line and send a signal along it.  The water and sewer lines were found to not pass through the work area, giving peace of mind that no interaction with these utilities was possible and costly accidents due to hitting these lines were not going to occur.

Using these methods, the GPRS technician was able to locate the gas lines, water line and sewer line at the residence.  With the field markings clearly in place and communicated with the owner and the construction foreman, excavation was able to be completed quickly and safely.

Water line located using induction method and flagged to indicate path.

Water line located using induction method and flagged to indicate path.

In construction, professionalism is everything, and completing your projects without incidents can make or break your bottom line. When you are excavating, it is important to have utilities privately and publicly located. Utilizing GPRS for your project will help reduce injury, increase productivity, and maintain incident-free professionalism that your clients demand.

GPRS uses the latest and greatest technology to locate power lines, fiber lines, water lines, UST’s, storm drains, and sewer drains under the surface. Utilizing GPRS on your project can help mitigate costly repairs, prevent severe injuries, and maintain the integrity of your project.

Ground Penetrating Radar Systems of Pittsburgh is available to service the private utility locating and concrete scanning needs of Western Pennsylvania.

Urgent Request Met By GPRS Technicians At Pittsburgh International Airport

Ground Penetrating Radar Systems (GPRS) Inc. was contacted to locate underground utilities by a construction company that is completing an overhaul of the communications and power stations around the Pittsburgh International Airport.

An urgent request was made by the contractor to have a same day underground utility locate done, and with over 150 GPRS technicians across the country, the request was met by the GPRS technicians out of Pittsburgh.

The job required the location of an underground power line that would be tapped into and run directly to the energy shelter to reduce redundancy and material.  Ground Penetrating Radar (GPR) along with passive and direct connect radio detection were used to locate the power line and the communication lines that crossed through the prospective trench dig path.

The GPR and direct connect radio detection methods were able to accurately locate the position of four underground lines that would impact the project.  Along with location, GPRS technicians were able to determine the depths of the lines as well.  Knowing the location and depths of the lines helped the contractor save time and eliminate potential stress, injury and additional costs for this project.  Communicating with the contractor and documenting the utility locations with clear and accurate field markings and site photos were helpful methods to ensure the safe completion of the project.

pittsburgh

In construction, professionalism is everything, and completing your projects without incidents can make or break your bottom line. When you are excavating, it is important to have the utilities privately and publicly located. Utilizing GPRS for your project will help reduce injury, reduce lost productivity, and maintain incident-free professionalism that your clients demand.

GPRS uses the latest and greatest technology to locate power lines, fiber lines, water lines, UST’s, storm drains, and sewer drains under the surface. Utilizing GPRS on your project can help mitigate costly repairs, prevent severe injuries, and also maintain the integrity of your project.

Ground Penetrating Radar Systems of Pittsburgh is available to service the private utility locating and concrete scanning needs of Western Pennsylvania.