GRIZZLY Dynamic Probing Super Heavy (DPSH) and Drilling Rig Overview
The GRIZZLY Instrumented Dynamic Probing Super Heavy (DPSH) is a self propelled dynamic probing and drilling rig. This constant energy heavyweight dynamic cone penetrometer is used for soil investigation and compaction control 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. The GRIZZLY provides immediate repeatable results so that on-site decisions can be made straight away and adheres to EN ISO 22476-2. Attachments available include a geotechnical drilling head and auger (diameter 63 mm) for soil investigation at depth, window sampling and windowless sampling and a Standard Penetration Test (SPT) core sampler.
Advantages of the GRIZZLY Dynamic Probing Super Heavy (DPSH) include:
- In situ ground investigation and compaction control with continuous measurement providing results with on-screen display and on-site analysis, enabling immediate decision making and eliminating human error during data capture.
- 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).
- For compaction control, the embedded GRIZZLY data acquisition and analysis software has an integrated compaction control data base for various soil types – the measurement of the driving depth in mm per strike 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 database of more than 2500 data points 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.
- For soil investigation, a geological profile (database available) can be associated with the penetrogram.
- Good at measuring the interface between hard and soft “pathogenic” zones which are of great interest to geo-technicians.
- Data export using a USB key enables further interpretation, analysis and presentation using the PC based GeoSprint software.
- GPS-System for immediate test position location and recording and integration with Google Earth / Google Maps
- One person operation
- Geotechnical drilling head option allows for 2 machines in one (drilling rig and DPSH). One can also do window sampling, windowless sampling and the Standard Penetration Test (SPT) with the GRIZZLY.
- Fast to setup once you have arrived on-site (10 mins) and complete a test (5 mins).
- Typical dynamic probing maximum measuring depth of 10m but depending on the soil, you may be able to investigate deeper.
- Integrated powerful hydraulic rod extractor for dynamic probing rod extraction.
- Hydraulic vertical and lateral pole adjustment
- GRIZZLY can easily be loaded in a commercial vehicle for transport (no need to have a specific driver’s licence)
- 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.
- Dimensions of the GRIZZLY DPSH (L 2.03m x W 0.89m x H 1.22m) enable it to work where there is a problem of 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.)
- Weight of the GRIZZLY (~950kg) facilitates its transport by crane, excavator or helicopter.
Applications using the Dynamic Probing Super Heavy (DPSH) constant energy heavyweight dynamic cone penetrometer method include:
- Soil investigation studies (buildings, houses, foundations, 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, geotechnical drilling and site investigation and 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.