U.S. Patent No. 5,186,263

Open-Tube Sampling
The simplest use of the Macro-Core® sampler is the open-tube method. Coring starts at the ground surface with an open-ended sampler. In stable soils, the open-tube sampler is inserted back down the same hole to obtain the next core.

A. Sampler driven to proper depth.

B. Open hole from previous sample.

C. Open-tube sampler driven back down previous hole.

D. Sampler driven to proper depth for sampling second interval.

Closed-Piston/Protected Sampling
In unstable soils that collapse after sampling, the Macro-Core sampler can be equipped with a stop-pin and piston rod system to prevent unwanted soil from entering the sampler as it is being advanced to the next sampling interval.

A. Previously cored or pre-probed hole with sloughed soil.

B. MC Closed-Piston Sampler driven through slough to top of sampling interval.

C. Removing stop-pin and piston rod to release point assembly.

D. MC Closed-Piston Sampler driven to collect representative soil core.

Macro-Core® is a Registered Trademark of Kejr, Inc.