Multipurpose Rotary Drilling Rigs

Comacchio GEO305HT

Drilling with the Comacchio GEO305HT Multipurpose Rotary Drilling Rigs.

Medium in size, large in power and performance, the Comacchio GEO305HT is as capable conducting SPT’s as it is drilling 50m rotary cored and open boreholes. The Comacchio GEO305HT rig, weighing in at 5.50-6.00t (variant dependent) is transported to site by ADP Group’s own LGV transport truck and supported by an Iveco 7ton van containing all the drilling equipment and site specific materials.

With the ability to hollow stem augur and dynamic sample to 25m, rotary core and open hole to depths of up to 100m, and undertake a wide variety of geotechnical and environmental in-situ tests, the Comacchio GEO305HT is the answer to all your SI problems. The Comacchio “slide-o-matic” head allows the transition between the high torque, high speed rotary head and the high power hydraulic impact hammer in a matter of seconds – meaning borehole progression, sampling and tests in any geology!

The perfect geotechnical borehole rig is complemented by a rig mounted SPT hammer, not only making the process more efficient but also eliminating the requirement to lift the hammer manually – reducing manual handling onsite! The GEO305HT is equipped with a high pressure mist/wash-down pump and a TR200 (150lpm) mud recirculation pump. In compliance with all HSE and client requirements all of our rotary drilling rigs are fully guarded, giving ultimate protection to all drillers and public.

GEO305HT Rig Dimensions (when working)

Width: 1.63m Length: 4.00m Height: 6.35m (reduced height 4.85m)

Weight: 5.20-5.50 tonne Minimum Working Area: 3m wide x 8m long

Rig Feed: 3.50 tonne Rig Pull Back: 5.00 tonne Engine Power: 75hp

Noise Levels: Engine Idle @ 1m = 88dB / DS Hammer @ 1m = 115dB

Maximum Gradient (access and working): 36% (20 degree)

Rigs in fleet: DR3 & DR10

Dynamic Windowless Sampling
Windowless sampling barrels between 86mm and 146mm diameter contain plastic liners to retain soil samples. Liners are removed from sample barrels after drilling. The use of a plastic liner allows for excellent presentation of high quality samples.

In-Situ Geotechnical Testing (all hammers calibrated annually)
Standard Penetration Testing, weight of 63.5kgs is dropped over a calibrated distance of 760mm, the number of blows taken to drive the sampler over a set distance is recorded. ADP Group’s GEO305’s have rigmounted, manual handling reducing SPT hammers.

Undisturbed Sampling (U100, UT100, U70)
Undisturbed samples with either thin walled (class 1) or standard undisturbed sample barrels can be taken with the rig.

Hollow/Solid Stem Augering (Fully guarded)
The rotary drive heads on our rigs can be set to a low speed high torque setting to allow for both hollow and solid stem auguring 8”, 10” & 12” diameters to depths of 25m, in the case of hollow stem auguring we can also advance windowless sampling barrels through them to allow for soil samples to be taken at any stage of the location during drilling.

Rotary Open Hole Drilling (fully guarded)
Down the hole hammer (DTHH), tri-cone rock roller, PDC and drag bits can be used for rotary open hole drilling. DTHH is used with air flush for open hole drilling in rock and hard strata. Tri-cone, PCD and drag bits can be operated with air, air mist or water flush. Open boreholes can be formed to depths in the order of 100m making the GEO305 the ideal rig for GSHP and water boreholes where access is a problem.

Conventional Rotary Coring (Fully guarded)
Thin wall double tube core barrels incorporating a plastic liner are used to retrieve cores up to 123mm diameter.
The rigs can use water or air flush as required.
The ability of our rigs to soil sample and rotary core allows for borehole progression in most ground conditions to depths in the order of 100m.

Wireline Coring (Fully guarded)
Wireline coring can be carried out with the use of Geobor-S. Wireline cored boreholes can be formed to depths in the order of 100m, with fantastic core recovery in unbeatable speeds!

Symmetrix Over Burden Casing System (Fully guarded)
Symmetrix casing systems can be utilised where overburden or unconsolidated sands/gravels can become a problem, the Symmetrix casing system is available in an OD of 168mm, providing an ID of 132mm through the ring bit.

Common Applications for the GEO305HT Rig

  • Monitoring well installations
  • Recovery well installations
  • Piezometer installations
  • Geotechnical & geoenvironmental drilling
  • Water well installations
  • GSHP/Geothermal loop installations

Other drilling services

  • Industry Sectors

  • Window Sampling

  • Borehole Grouting

Our Certifications