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Home Page > PRODUCTS > CPT EQUIPMENT > CPT ACCESSORIES > CPT RODS AND CASING PIPES 
CPT RODS AND CASING PIPES

CPT RODS AND CASING PIPES


For Cone Penetration Tests and placing casing pipes, several types of rods are available, with several different diameters, lengths and screw threads. The corresponding clamping blocks, dirt wipers and pre-push cones are available for all mentioned diameters.

 

The types most used are shown below.

 

Types of threads

 

AR-thread

An improved type with rounded threads. Thanks to the absence of sharp edges the screwthread connection is almost as strong as the rod's cross section.

 

2R-thread

The latest type which is equal in strength to the AR-type. The difference is that 2R-threaded rods need to be turned 3 times to tighten them instead of 6 times in case of the AR-thread. 2R-thread rods are available in 1 metre working length. Adaptor pieces between 2R-threaded rods and other types are also available.

 

Cone Penetration Testing rods

 

Ø45/23,5 mm

Can be used in combination with the 15 cm2 cone. The large diameter is less vulnarable to buckling and therefore excellently suited for heavy Cone Penetration Tests.

 

Ø36/16 mm

Standard Cone Penetration Testing rods, used in combination with the 10 cm2 or 15 cm2 cones. The special alloy used for this rod guarantees a high strength and a long lifetime.

 

Ø25/12 mm

To be used in combination with the 5 cm2 cone. Special connectors for lengthening the measuring cable are also available for this smaller diameter. The rods are available in working lengths of 500 and 1000 mm. This type is standard provided with AR-thread.

 

Ø16/9 mm

For use in combination with the 2 cm2 cone, most commonly used offshore.

 

Casing pipes

 

Ø56/39 mm

The casing pipe is mostly used to protect the Cone Penetration Testing rods against buckling. The inner diameter lets the CPT rods pass easily. Several accessories are available to facilitate the use of casing pipes, like cutting mouths, dirt wipers and cutting mouths combined with dirt wipers functioning as catching mechanism at the same time.

 

Ø60/44 mm

These casing pipes are mostly used for installing closed vertical ground loops. They can also be used as support casing.

 

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