SPT Soil Testing Investigation Drilling Machine Hollow Auger Process and Direct Push Process Hydraulic Core Drilling Rig

A soil sampling coring drill is a specialized piece of drilling equipment designed for extracting undisturbed, cylindrical samples of soil, sediment, or soft rock from the ground. This equipment is essential for geotechnical site investigations, environmental assessments, and agricultural research. It typically consists of a robust mechanical or hydraulic drive system that rotates and advances a hollow core barrel into the substrate. The core barrel, often lined with a plastic or metal sleeve (a liner), cuts and retains a precise, continuous sample that preserves the natural stratification and structure of the material.
Environmental drilling is a way to investigate and delineate subsurface conditions and monitor them over time.
The data collected may be used to identify areas of soil or groundwater contamination, log water table depths, or monitor and confirm the efficacy of remediation efforts.

High-Precision Sampling: Retrieves intact core samples for accurate laboratory analysis of composition, density, moisture content, and contamination levels.
Versatile Applications: Suitable for a wide range of soil conditions, from soft clays to more compacted soils and weathered rock.
Portable Designs: Many models are lightweight and portable, allowing for easy transport and operation in remote or confined sites. 
This equipment provides critical data for foundation design, construction planning, and environmental monitoring.

Hollow-Stem Auger Drilling

A hollow-stem auger rotates to drill into the ground, allowing soil samples to be retrieved through the hollow center of the drill stem. This method is widely used for environmental sampling and geotechnical soil investigations. Unlike down-the-hole percussion rock drilling, it excavates soil through auger cutting action and is particularly suitable for soft soil, silt, and fill layers.

Direct-Push Method

No rotation or impact is required. The drill rod is pushed directly into the ground by hydraulic cylinder pressure. Because it relies solely on static force without rotation, this technique is most commonly used in environmental soil sampling equipment.