CPT Rig: The Ultimate Choice for Site Characterisation

Photo Source: Probedrill
Summary:

This article discusses the debate between Cone Penetration Testing (CPT) and Standard Penetration Testing (SPT) in site characterisation.

  • CPT provides real-time digital in-situ soil behaviour type (SBT) data, is cost-effective, faster, and offers high precision compared to other methods. It aids in making swift geotechnical design and field characterisation decisions. Examples of CPT rigs include the S4 Sounding System by Vertek and others by Geomill Equipment, Insitutek, Royal Eijkelkamp, and Geoprobe.
  • SPT, though cost-effective, may not offer precision especially with materials like coarse sand or clay. It is a method that helps determine the angle of shearing resistance, cohesionless soils’ relative density, and stiff cohesive soils’ strength.

The article concludes that CPT rigs are a superior choice for site characterisation due to their speed, efficiency, and accuracy. With numerous reliable manufacturers and suppliers available, and excellent drilling services in Australia, the article urges the adoption of CPT rigs for site characterisation.

CPT ConeTec

In the world of site characterisation, there’s an ongoing debate about the best method to use. The central point of discussion is often between Cone Penetration Testing (CPT) and Standard Penetration Testing (SPT). This article will provide a comprehensive look at both methods, focusing on the superiority of CPT rigs.

Table of Contents

  1. Understanding CPT Testing
  2. The Appeal of SPT Testing
  3. CPT vs SPT: A Comparative Analysis
  4. CPT Rig Manufacturers & Suppliers
  5. CPT Drilling Services in Australia
  6. Final Thoughts

Insitu Site InvestigationUnderstanding CPT Testing

Cone Penetration Testing, commonly known as CPT, is a method that provides real-time digital in-situ soil behaviour type (SBT) data. It is swift, secure, and its digital-sounding files can immediately inform geotechnical design and field characterisation decisions.

CPT is not only highly precise but also cost-effective compared to other testing methods. It is three times faster than SPT site characterisation, which triples productivity and reduces waste generated. The data obtained can be exported and utilised in various modelling software to assess risk accurately in design and inform geotechnical decisions.

Several companies offer excellent options for soil testing rigs, such as the S4 CPT Sounding System by Vertek. It is a cost-effective push system that works well with construction equipment and comes with a dedicated trailer system. The S4 offers exceptional soil testing capabilities, making it a suitable alternative to SPT Testing in almost any location.

The Appeal of SPT Testing

The Standard Penetration Test (SPT) is a cost-effective geotechnical examination method. It helps determine the angle of shearing resistance, cohesionless soils’ relative density, and stiff cohesive soils’ strength.

To conduct an SPT test, a thick sample tube is placed at the base of a borehole and hit repeatedly with a heavy slide hammer. The number of strikes needed to drive the tube 6 inches into the soil is noted. The test concludes when the tube reaches a depth of 18 inches.

Despite its simplicity and cost-effectiveness, SPT Testing has limitations. It may not be as precise as advanced methods, particularly when dealing with materials like coarse sand or clay. On the other hand, CPT can offer a faster and more efficient way to conduct seismic soundings.

CPT vs SPT: A Comparative Analysis

As Otto Holmquist, President and Principal Engineer of GEOLINES, stated,

Every time a geotechnical engineer sees how efficient it is, they are hooked.

He was referring to the efficiency and accuracy of CPT testing.

Choose CPT over SPT for the following reasons:

  • Speed and Efficiency: CPT is three times faster than SPT, leading to increased productivity.
  • Accuracy: CPT provides high-resolution in-situ results, while SPT often utilises variable intervals and limited grab samples from various depths.
  • Cost-Effectiveness: CPT is relatively inexpensive compared to other testing methods.
  • Versatility: CPT can obtain shear wave velocity, sediment pore pressure dissipation, and discrete sampling.

Popular CPT Rig Manufacturers & Suppliers

Geomill Equipment

Geomill’s Panther-150-Flex-200 is a model from their Panther series well worth considering. This rig can be deployed as a standalone unit or as a Truck/Panther combination while positioned and locked onto the customised carrier truck. It can access any terrain, whether it be road surface or soft grounds.

Insitutek

Insitutek’s Midi CPT Crawler is suitable for restricted access locations where large CPT vehicles cannot be deployed making this unit a standout. Despite being compact, there is ample space for storage of cones, rods, friction reducers, and wrenches.

Royal Eijkelkamp

The Boxed Crawler 100 kN series from Royal Eijkelkamp is a fully contained crawler mounted unit for CPT testing. It can traverse any ground and is rail track ready. It can be ballasted for up to 130 kN pushing force. This was our favourite from the Eijkelkamp range.

Geoprobe

Geoprobe’s 2060CPT rig is designed for drillers who want to rely on static weight for their CPT machine. It offers 20-tons of downforce and 30-tons of pull with weight evenly distributed over the entire platform. 

Some Reputable CPT Drilling Services in Australia

In Australia, there are several reputable companies that provide CPT drilling services. When starting out your research, looking through contractors in your area is a great start. See who uses what and look for any gaps in the CPT demand that you could possibly fill.

Here are some of the best in the industry:

Legion Drilling Services

Edge Drilling Western Australia

Stratacore Drilling

Terratest

Black Insitu Testing

ConeTec

These companies have a proven track record of delivering excellent service and accurate results. Most of these contractors have information on their own project experience with CPT rigs and their preferred rig. If you have an interest in adding CPT services to your business it is well worth researching who uses what rig and why. Not every rig is perfect for every project. Start small, buy a used CPT rig or lease /borrow one until you find what is a good fit for your business.

Final Thoughts

When it comes to site characterisation, CPT rigs have proven to be a superior choice over SPT. Not only are they faster and more efficient, but the data they provide is also more accurate and can be used immediately to inform geotechnical decisions. With numerous reliable manufacturers and suppliers available, and excellent drilling services in Australia, the choice for CPT is clear.

The future of site characterisation is here, and it’s time to embrace the convenience and accuracy of CPT rigs.

Cone Penetration Testing (CPT) is a method that provides real-time digital in-situ soil behaviour type (SBT) data, which is swift, secure, and highly precise. It is three times faster than SPT site characterisation, making it more cost-effective and efficient. Despite the simplicity and cost-effectiveness of SPT Testing, it may not be as precise as CPT, particularly when dealing with materials like coarse sand or clay.

CPT offers several advantages over SPT, including:

  1. Speed and Efficiency: CPT is three times faster than SPT, leading to increased productivity.
  2. Accuracy: CPT provides high-resolution in-situ results, while SPT often utilises variable intervals and limited grab samples from various depths.
  3. Cost-Effectiveness: CPT is relatively inexpensive compared to other testing methods.
  4. Versatility: CPT can obtain shear wave velocity, sediment pore pressure dissipation, and discrete sampling.

Some reliable manufacturers and suppliers of CPT Rigs are Geomill Equipment, Insitutek, Royal Eijkelkamp, and Geoprobe. Each of these manufacturers offers unique features and capabilities in their CPT rigs, catering to different site requirements and conditions.

Yes, in Australia, there are several reputable companies that provide CPT drilling services. These include Legion Drilling Services, Edge Drilling Western Australia, Stratacore Drilling, Terratest, Black Insitu Testing, and ConeTec. These companies have a proven track record of delivering excellent service and accurate results.

SELL YOUR DRILLS WITH RIG SALES

Well established network - 40 YEARS

No BS approach
Driller for nearly 20 years
Reputation built on integrity
Transparent process from start to finish

SELL WITH PEACE OF MIND

Protection for both seller and buyer
Transparent Process - So we are all on the same page
JotForm + DocuSign Secured
GET STARTED

FUTURE RIVER PTY LTD – Licenced Dealer # 4752385

PAUL STEVEN COOMBS – Licenced Dealer # 4720719 

© 2024 Rig Sales Australia. All Rights Reserved.

Shopping cart

0
image/svg+xml

No products in the cart.

×