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Home Drilling Rigs Geotechnical Dando Dual Mast Terrier


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The Dando Dual Mast Terrier has been designed to use a wide range of drilling techniques in the same borehole, using the tried and tested Terrier drive sampling system and powerful rotary drill alternately without having to change masts.

Designed to trip out drilling equipment in 4m lengths using the telescopic winch system, the Dual Mast Terrier operates by hydraulically sliding the drive sampler or rotary drill into position over the borehole when required. With this new innovative machine it is possible to sample and perform a standard penetration test to a depth of 20m+ and core to approximately 50m.

Occupying a small footprint, the compact and extremely versatile rig is designed to still be easily transportable and simple to manoeuvre through tight spaces with difficult access, causing very little disturbance to its surroundings.

See also:

Standard Dando Terrier

Lightweight Dando Terrier

Angle Drilling Terrier with Track Mounted Compressor

Drive Sampling

MAIN STRUCTURE

A fabricated box section sub-frame incorporating drop hammer support, controls, engine mounting and tool storage.

DROP HAMMER

A two-piece drop hammer runs on two guide bars. The weight is fully guarded and can be quickly changed for  SPT or dynamic probing standards. Next to the drilling controls a blow counter is installed which is illuminated with large digits for easy reading. An extension loom is provided when operating the mast remotely. Attached to the mast is a 1m measurement scale for the easy monitoring of progress.

Trip Hammer Speed: 0-50 blows per minute
Trip Hammer Drop: 500mm - 750mm
Trip Hammer Weight: 50kg or 63.5 kg

DRILL MAST ASSEMBLY

A fabricated, welded steel box section construction, hinge pin mounted to main superstructure, hydraulically raised and lowered.

Overall height: 2500mm (transit) ; 4500mm (deployed with stinger)
Pull down capacity: 1000 kgf
Pull back capacity: 7000 kgf
Width: 930mm (transit)

CARRIER

A purpose built crawler chassis with rubber tracks fitted with tilt mechanism.

Total weight: 1460 kg
Crawler width: 800mm; 900mm (with control box)

ENGINE AND HYDRAULIC PTO

Hydraulic system powered by a 16.8HP water-cooled diesel engine, provides power for drilling, rigging and tracking:

Flow for PTO: 38.88 l/min
Maximum Working Pressure: 152 bar

WINCH

Maximum single line pull: 400-475kg

Rotary

HYDRAULIC ROTARY DRILLING MAST AND HEAD

Driven by a hydraulic motor fitted with a 7 : 1 ratio gearbox with manual gear change, providing full controlled power and rotational speeds in forward or reverse. Integral side inlet water swivel and BW Rod connection fitted to travelling carriage plate with bolts. Dando offer a number of motor options to cater for specific customer requirements. See standard specification below:

High Range

Maximum Torque 155.6 ft-lb, 211Nm
Maximum Spindle Speed 360 rpm

Low Range

Maximum Torque 1089 ft-lb, 1477Nm
Maximum Spindle Speed 52 rpm

Guide Ring: 280mm effective ID (other options available)

MAST AND CARRIAGE ASSEMBLY

A fabricated welded steel box section construction fitted with a pair of wheels and two levelling jacks. Hydraulically raised and lowered by a single double-acting ram on the main Terrier undercarriage and attached via the pivot frame assembly.

Length= 2750mm
Height= 1962mm (1.6m stroke)

FEED AND HOIST SYSTEM

Provided by a single double-acting ram transmitting adjustable hydraulic load to the rotary head.

Stroke: 1.6m to accommodate 1.0m effective length drill rods. Extendable option available to accommodate 1.5m effective length drill rods.
Feed force: 1000kgf
Pullback: 7000kgf

CONTROLS AND HYDRAULIC POWER

Hydraulic functions of the hoist/feed and rotation are controlled from the main hydraulic control valve on the Terrier. Hydraulic power is supplied via PTO from the main Terrier hydraulic power pack.

Weights: Base Unit: 754kg 1.6m Rotary Attachment: 265kg

JACK LEGS

Set of stabilising jacks.

OPTIONS

Rotary concrete coring head

Casing Extractor

Lifting kit

Chalwyn Valve and Spark Arrestor

Wireless Remote for Tracking

Equipped for Texas Cone Penetration Standards

Please note: All figures and claims made here are indicative and Dando Drilling International reserves the right to make alterations to specification detail without notice. 

Photos

Gold Tailings Project, Escondida Mine, Chile

A Dando Dual Mast Terrier with 35hp engine and expanded tracks for use in a tailing project at Escondida, one of the largest mines in Chile. 

Dando Dual Mast Terrier, Philippines

Site Investigation, Australia

Dando Dual Mast Terrier, Hawaii 

Dando Dual Mast Terrier with Expanded Tracks

Dando Dual Mast Terrier 

Video

Drilling with the Dando Dual Mast Terrier