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GPR News September - December 19

 

GPR Field Methods for Minimizing Site Impact (Part 2)

Application 2:  Core holes with line stops 

Project 2:  Water main burst onto tennis courts

Challenges

  • New pavement (recently laid) so minimal impact key a low cost of reinstatement
  • Non-traceable water main (asbestos) at roughly 900mm
  • Leaking around T-joint to fire service connection. Difficult to determine if it was the water main, fire service or joint that was leaking
  • Water main valves were not close to leak and shutting them would affect many businesses. Also, it is a very old water main so valves may not work

Possible Solutions

  • Use water stops – install band on pipe; water stopper senses pressure then expands to shut water (look them up to understand)
  • Turn valve off – may or may not work and will affect businesses

Solution

  • GPR to determine path of water main
  • Small core hole pavement on either side of leak which was a much better solution than doing a square cut as it maintains structural integrity when core replaced.
  • Live repair (band aid) – suck down with dry vac, find cast joint that was split and had to be cut out.
  • Install water stops
  • Put in a new T-joint

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GPR Field Methods for Minimizing Site ImpactGPR Field Methods for Minimizing Site Impact



 

 

 

 

Project 3:  Connecting new water main & join into existing line

Challenges

  • Shut off valves far away and would affect 10 businesses that had just opened the same weekend
  • Brand new 400mm bitumen paving. Saw cut would be too intrusive.  To get through the 450mm bitumen, you would need a 500mm blade so minimum square hole would have been 1m x 1m
  • Miscommunication about connecting to existing line
  • Non detectable (EM wand) PVC water main

Solution

  • GPR to confirm path of new water main and existing water line. GPR was correct and drawings were slightly off hence off-centering in photos… 
  • Core hole through 400mm bitumen. Core was replaced to maintain road integrity
  • Water stop the line and core it at good spot on new road

GPR Field Methods for Minimizing Site ImpactGPR Field Methods for Minimizing Site Impact3

  

 

 

 

 

 

 

Product Focus: Proceq GP8800

We take a closer look at one of the most excting products to hit our shores this year. 

The Proceq GP8800 is a rugged, ultracompact single wheel GPR.  Small enough to fit in the palm of your hand it makes it possible to get into tight spots, close to walls and around columns.  Ideal for locating multiple layers of rebar, tendons, ducts, pipes and estimating slab thickness, the GP8800 can be used for hit prevention, as-built verification and structural investigation even in the tightest areas. 

The GP8800 produces high resolution scans up to a maximum depth of 650mm by using a stepped frequency antenna which covers a frequency range of 0.4 to 6.0 GHz.  For flexibility, the single-wheel connect on either side of the probe allowing for cross-polarization. 

The GPR probe connects wirelessly to your iPad and utilizes the user-friendly Proceq GPR Live App allowing for on-site reporting, 3D scans and Augmented Reality.

Here is a comparison of the data from the GP8800 and the GP8000
 
GPR Proceq
 
 
On the left we have the lower frequency data from the GP8000  and on  the right we have the higher frequency data from the GP8800. The GP8000 can see much deeper with PT at about 420mm, whilst the resolution on the GP8800 data is much higher with perfectly defined hyperbola. The next comparison set shows the top targets zoomed and highlights the difference in resolution.
 

 

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