Standard Penetration Testing Tools

Geoprobe® direct push machines outfitted with a DH-Series Automatic Drop Hammer can be used to perform the Standard Penetration Test (SPT).

Use either a hollow stem auger setup or our 3.25 in. probe rod system.

Automatic Drop Hammer on a 7720DT Automatic Drop Hammer on a 8040DT Automatic Drop Hammer on a 6620DT

Split-Barrel Soil Sampling Systems
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Hollow Stem Augers
Hollow stem augers are turned to the desired depth with a pilot bit blocking the rod ID. The pilot bit is pulled and a split barrel sampler (split spoon) is lowered. The drop hammer is then placed on top of the rod string and the number of blows to advance the sampler is counted. The pilot bit can then be placed back in the augers and the auger string advanced to the next testing depth.

Geoprobe® 3.25 in. Probe Rods
3.25 in. probe rods are driven to the desired testing depth. The solid drive tip is pulled and a split barrel sampler is lowered. The drop hammer is then placed on top of the rod string and the number of blows to advance the sampler is counted. The solid drive tip can then be placed back in the cutting shoe and the rod string advanced to the next testing depth.

20739 Split Barrel Sampler
Split Barrel Soil Sampler
20739

This sampler is commonly referred to as a split spoon sampler. Used for sampling with the DH-Series Automatic Drop Hammers and SPT Systems. The SPT blow count is the number of blows of the automatic hammer required to advance the split barrel sampler 12 inches (305 mm).

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Drive Cap, Centering
16914

The Centering Drive Cap centers the 1.5 in. probe rods during driving. The dirve cap is placed on the top 1.5 in. probe rod and fits the ID of the 3.25 in. outer probe rods.

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Adapter
17320

1.5 in. Pin x AW Pin. Used to adapt AW thread to Geoprobe® 1.5 in. probe rod thread. The Split Barrel Sampler (20739) has an AW box at the top. Adapter is required if 1.5 in. probe rods are used.

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Drive Cap, Threaded
15590

Threaded Drive Cap for 1.5 in. Probe Rods. For use with GH40 Series Hammers and with the DH-Series Automatic Drop Hammers.

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SPT Cutting Shoe
20737

2.38 in. (60.5 mm) ID. This Cutting Shoe threads into the leading 3.25 in. probe rod and provides an opening for the Split Barrel Sampler (20739) during the SPT test. Requires a 21114 SPT Solid Drive Tip to seal tool string while advancing outer casing to SPT interval.

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SPT Solid Drive Tip Assembly
21114

2.37 in. (60.2 mm) OD. Seated in the 3.25 in. SPT Cutting Shoe Assembly (20737) as the 3.25 in. probe rods are driven to testing depth. 1.5 in. rods hold the point in place. Requires O-rings.

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O-rings for SPT Solid Drive Tip Assembly
19744

Replacement O-rings for Solid Drive Tip Assembly (21114). Pkg. of 25.

 

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