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“Fly” into a defected pile

“Fly” into a defected pile

A 3D “flight” into a defected pile to visualize all the hidden defects
Data logged by the CHUM – CrossHole Ultrasonic Monitor

 

 

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You are probably spending too much time on your testing!

You are probably spending way too much time on your testing!
Why is this happening?
And what am I doing wrong?
Read the following article to find out!

“My boss did not believe how fast I tested this 100-pile retaining wall”

He figured it would take me 2-3 minutes per pile which is over 3-5 hours, but I finished in half that time thanks to the following PET features:

 

I first used [Pile]-[Insert multiple piles] – it is a bulk-insert feature. When I need to test a long series of piles this feature saves me repetitive and tedious typing. This feature can be accessed from the Pile tab on the top menu. I can even define complex pile-name series.

My tip: if the series isn’t continuous (for example, 1..5, 10..15, 20..25, … .90..95) – I simply fill the whole range (1-95)  – it is faster the delete untested piles later on.

 

The piles were names 1E to 100E and were all 11m deep (planned) – adding them took less than a minute.

I started testing them piles, knowing that I still have to produce a report today, I wanted the data I collect to be as close as possible to final, so that I would need very little office time to work on them later on.

 

Next thing I did was to make sure the SmartTrigger is ON, when moving around the pile head, many false impacts are triggered by random accelerometer movement. The SmartTrigger looks at the trigger shape, and removes most  of the false triggers, while still passing nearly all the good ones.

With SmartTrigger on I could set the trigger to a very low and sensitive level and still filter out most of the random noise. My hammer taps could now be fast and gentle and I still get more quality data in less time.

 

In addition, why keep irregular impacts? With Auto-Sort I can set the desired numbers of impacts to collect. Once this number is reached, the impacts are sorted and the most irregular one are removed to the recycle bin. The remaining set of impacts is regular and consistent. The piles were quite easy to test and I have set the AutoSort to 15 impacts. This may sound like a lot, but tapping 2-3 times per second meant I could collect a repetitive set of 15 impacts in less than 30 seconds

 

I also switched on the [Signal options]-[Convergence] message – it pops up when the collected data is sufficient – As soon as 1) a sufficient number of impact traces have been collected and 2) adding additional impact traces has only a marginal effect on the average result. I selected 15 impacts and 5%

With all this set up – I just started and finished testing the whole wall in under 1.5 hours. A couple of pile were giving me irregular results and needed more attention.

I did not bother with analysis – I just took a brief look to see that I collected good data, and went to the next pile, knowing that I have very little office time on it.

Coming next – how to save on Analysis and Report time

Posted by admin in Inclination Testing, Pile Testing, 2 comments
Defects Library

Defects Library

Unsorted library of defected piles and other deep foundations

All found with CHUM and PET

 

Posted by admin in Pile Testing, 0 comments
3DT Note

3DT Note

Animated 3DT (part of the 3D package)

Why real 3 Dimensional Tomography (3DT) is important?

Drawings or graphs can only display 2D data. In order to be able to view 3D data optimally an animated display solution that supports interactive 3D rotation of the 3D object (pile) is needed. Detected flaws can be viewed from different angles and perspectives thus providing essential information for the decision makers.

Piletest 3DT solution for CHUM software offers unique interactive 3D display for CSL system test results.

When do you need to run 3DT?

1 – 3DT provides a more tangible view of the detected flaw in the pile, that can be readily presented to the customer.

2 – When the standard 1D presentation (in either Waterfall, FAT or Relative Energy) or even Piletest unique 2DT presentation do not provide enough information to assess a marginal anomaly in the pile.

 Note3DT has limitations, resulting from many factors, which you can read about here. Piletest recommends that decision makers should use 3DT and “Effective Area” in particular, only as a decision supporting tools, and not  by itself for “go/no-go” decisions.

Posted by admin in Pile Testing, 1 comment