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. 

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.   

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.