GRIZZLY® Dynamic Probing Super Heavy (DPSH) and Drilling Rig Overview
- Self propelled DPSH rig with geotechnical drilling capability
- Used for compaction control, site investigation, geotechnical drilling and soil sampling (windowless push tube sampling and Standard Penetration Test (SPT) split spoon sampling) for chemical and geotechnical analysis
- Immediate repeatable results so that on-site decisions can be made straight away
- Meets EN ISO 22476-2 standard
The GRIZZLY® Instrumented Dynamic Probing Super Heavy (DPSH) is a constant energy heavyweight dynamic cone penetrometer is used to measure the in-situ strength of fine- grained and granular subgrades, base and sub base materials, and weakly cemented materials.
Depths of 10-15m or more can be achieved, depending on the soil type.
Using the data acquisition system, results can be presented as:
- Depth per blow (mm/blow)
- Cone resistance (MPa)
- N10 or N20
GRIZZLY® data is downloaded to WebSprint©, the cloud based software for securely storing, processing and interpreting your geotechnical data. WebSprint© facilitates easy collaboration across your team. WebSprint© gives you access to compaction control, soil investigation and correlations modules.
Site characterisation is unarguably the most important, but also most “difficult”, component of geo-engineering. The GRIZZLY® is designed to improve the quality of site characterisation and reduce the difficulties involved.
The GRIZZLY® meets NF P94-115 – Soil investigation and trials – Type B sounding with a dynamic cone penetrometer and EN ISO 22476-2 – Geotechnical engineering – Field testing – Part 2: Dynamic probing – DPSH-B.
The GRIZZLY® DPSH compares favourably with Cone Penetration Test (CPT) because it can test in materials that you cannot test with a CPT (e.g. course gravels up to 150mm) and does not have high cost wearing parts (like CPT sensors and their calibration).
A geological profile (database available) can be associated with the penetrogram, giving a pictorial representation of the geology and stiffness of the ground.
In a world first, the Variable Energy option converts the GRIZZLY® from a constant dynamic energy penetrometer (DPSH) into a Variable Energy version, providing high resolution, reliability and accurate measurements in soft or very soft soils whilst automatically adapting to the resistance of the soils encountered during the test. Hence with the Variable Energy option, the GRIZZLY® DPSH is very good at measuring the interface between hard and soft zones which are of great interest to geotechnical engineers.
Attachments available include a geotechnical drilling head and auger (diameter 63 mm) for soil investigation at depth and soil sampling attachments (windowless push tube sampling and Standard Penetration Test (SPT) split spoon sampling) for chemical and geotechnical analysis.
Being light and compact, the GRIZZLY® is particularly good for testing in challenging conditions (difficult to access locations or confined spaces).
The GRIZZLY® is used to monitoring layer thickness, and to assess compaction homogeneity. It’s also used for layer identification.
Now you can see real time when doing the test if your material meets the compaction specification or not.
An integrated compaction control database for various soil types is used where the measurement of the driving depth (mm) and cone tip resistance (qd) is compared to a database based on the type of soil (soil classification), its water content and the required compaction quality (%OPN or OPM).
The related pre-calibrated reference and refusal lines, when compared to the test data, allow an assessment of the quality of the compaction to be made.
The database is catalogued in terms of plasticity, grain size distribution, water content, and level of compaction for both natural and artificial (crushed gravels) material types. Anomalies calculation is done automatically with the embedded GRIZZLYWIN software.
The GRIZZLY® DPSH meets NF P94-063 – Compaction quality control – Constant energy dynamic penetrometer method.
The advantages of the GRIZZLY® Dynamic Probing Super Heavy (DPSH) include:
- Provides immediate results so that on-site decisions can be made straight away.
- Fast to setup once you have arrived on-site (10 mins) and complete a test (5-10 mins) per test typical with results viewable on site.
- Without errors
- Equipment is instrumented (data is automatically and accurately recorded)
- Results are machine produced (overcoming manual data recording, transposition or calculation errors and fictitious results)
- Improved data flow and integrity
- Data export using a USB key enables further interpretation; analysis and presentation using the cloud based WebSprint©
- GPS located and time stamped – know where and when every test is done
- Visually presented results
- Graphical representation of the data (penetrogram) on the on-screen display, potting depth and cone tip resistance (qd) and your compaction control specification (reference and refusal lines)
- Improved safety
- To eliminate the need walk directly behind the GRIZZLY® in travelling mode, a remote wire controller allows the operator to be significantly distanced from the GRIZZLY®, whilst the rig is in motion.
- Versatile rubber tracked lightweight rig with a low centre of gravity, due to low height and tread width that matches the maximum width, provides the rig with great stability on difficult terrain and enables access to most site locations.
- Integrated support plate for better stability during penetration, extraction and drilling.
- Cost effective
- One person operation
- Compares favourably with Cone Penetration Test (CPT) because the GRIZZLY® can test in materials that you cannot test with a CPT (e.g. course gravels) and does not have high cost wearing parts (like CPT sensors and their calibration).
- Geotechnical drilling head option allows for 2 machines in one (drilling rig and DPSH). One can also do windowless push tube sampling and the Standard Penetration Test (SPT) with the GRIZZLY®.
- Compact highly capable DPSH rig
- Integrated powerful 11 tonnes hydraulic rod extractor
- Hydraulic vertical and lateral pole adjustment – allowing for slopes or inclinations of 25° longitudinally and 20° laterally.
- Variable Energy GRIZZLY® option increases the site characterisation range from medium to stiff materials to loose, soft soil and/or saturated sands, silts and clays.
- Good in challenging conditions, like limited physical space (e.g. buildings to be demolished), or difficult access (e.g. interior courtyards, hanging terraces, mountainous areas with no access route etc.)
- Dimensions in transport mode (L 1.86m x W 0.89m x H 1.23m)
- Weight of the GRIZZLY®(~850kg) facilitates its transport by crane, earthmoving machine or helicopter.
- GRIZZLY® can easily be loaded in a commercial vehicle for transport (no need to have a specific driver’s licence)
Applications using the GRIZZLY® Dynamic Probing Super Heavy (DPSH) constant energy heavyweight dynamic cone penetrometer method include:
- Soil investigation studies (buildings, houses, foundations and temporary works platforms, towers, platforms etc)
- Site preparation works (roads, pipes etc)
- Geotechnical diagnostics evaluations (subsidence, slope stability)
- Inaccessible sites (slopes, rough terrain etc).
Clients include those involved in pavement construction, pavement rehabilitation and investigation, material testing, site classification, soil investigation, site investigation, compaction control, geotechnical testing and geotechnical drilling. They include road authorities, councils, asset managers, mines, mobile crane operations, engineering and construction groups, subcontractors, geotechnical consultancies and research organisations.
To find out more, Contact Us.