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Collecting SPT through 3.75 in. Driven Casing


Our customers have used the 3.75 in. probe rod and DT37 soil sampling system to collect continuous soil samples and SPT samples for several years. 

The example on the left depicts the standard DT37 Dual Tube Soil Sampling System being advanced to collect a continuous soil sample. The example on the right depicts using the same 3.75 in. casing to collect SPT samples ahead of the driven casing.

The example on the left depicts the standard DT37 Dual Tube Soil Sampling System being advanced to collect a continuous soil sample. The example on the right depicts using the same 3.75 in. casing to collect SPT samples ahead of the driven casing.

Now, we’ve made it possible to collect SPT data via split spoon sampler and automatic drop hammer within the same 3.75 in. driven casing. 

With some small tweaks to the system, operators now have access to two valuable pieces of information – continuous soil samples and SPT samples.  

This system is applicable anywhere driven casing can be advanced with a Geoprobe® machine.   

Mike Carlin, Geoprobe® Tools Group

Mike Carlin, Geoprobe® Tools Group

While ASTM D1586 makes no mention of a driven casing method, our preliminary findings have found it to be a promising method for collecting SPT data.  

We will continue to conduct field trials, collect scientific data with this method, and work with our friends at ASTM to better educate engineers, consultants, and drillers on best practices regarding the collection of SPT data.

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