automatic tripped hammer type standard penetration test drilling

1. Concept:

The Standard Penetration test (SPT) is a common in situ testing method used to determine the geotechnical engineering properties of subsurface soils. It is a simple and inexpensive test to estimate the relative density of soils and approximate shear strength parameters.

2.SPT equipment includes:

3.Standard Penetration Test Prcess

SPT, involves driving a standard thick-walled sample tube into the ground at the bottom of a borehole by blows from a slide hammer with standard weight and falling distance. The sample tube is driven 150 mm into the ground and then the number of blows needed for the tube to penetrate each 150 mm (6 in) up to a depth of 450 mm (18 in) is recorded. The sum of the number of blows required for the second and third 6 in. of penetration is reported as SPT blowcount value, commonly termed  "standard penetration resistance" or the "N-value".

4.Standard Penetration Test Drilling equipment manufacturer---Zhengzhou DEFY

Since 1970s, Zhengzhou Defy has been one of the most powerful drilling rig manufacturers in China. In the meantime, she has large market share in Africa, Asia, South America, and other Europe areas, especially Kenya, Ghana, Tanzania, Chili. With average production of 200 set per month, Zhengzhou Defy has been one of the biggest exporters in China. She has earn her good reputation with high quality drilling equipment, systematic after sales service and sophisticated technical power.

5. Service

Zhengzhou DEFY is proud to offer support through the entire process, including engineering, manufacturing, installation and commissioning. In addition, we provide drilling life-cycle services to our customers, including spare parts, technical support, overhaul/modifications and professional rig training.

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