PRESS RELEASE
15 June 1995
Compact unit provides probe drill
logging and deviation measurement
in a single package

A new combined logging and deviation measurement system designed to
evaluate the quality and integrity
of bed rock during tunnelling
operations has been released by the
Swedish company Transtronic AB. The Inklinator Devilog is said to be
the first unit of its kind to combine automatic rock condition logging and hole deviation measurement in a
single package. According to the manufacturer, the system can provide considerable savings for contractors who are able to gauge blast depths, equipment needs and water-seepage precautions with considerable accuracy. It is also possible to verify that
the original tender specifications correspond with result data while providing detailed documentation about the completed tunnel thereby easing future maintenance.

The Inklinator Devilog logging system is simply connected to most types of drill rig. Transducers are used to measure pressures and flows in the rig’s hydraulic system and using these parameters as a basis, the unit records and measures deviations in the drilling process.
Run on its own PC field computer using a simple-to-understand software package, parameters are plotted in real-time on the monitor as the holes are drilled. Drill information can be stored on a diskette and read on any PC using graphic programmes such as Microsoft Excel. It can also be produced in print form for later evaluation. Once drilling is completed, plot analysis shows where cracked zones lie. The likelihood is that if a cracked zone is registered, the hole will not be straight.
Data interpretation is done by measuring parameters such as torque, feed force, rotation and penetration rates. Variations in torque indicate a cracked or shattered zone in the rock. The penetration rate, which is calculated by measuring the forward movement of the drill on a time axis, is a good indicator as to what kind of rock is being drilled, its quality and whether the drilling process has been correctly carried out. This information is valuable for the contractor who is thereby better able to guarantee the quality of his work.

Deviation
Probe holes are usually between 15 to 25 metres in length. When drilling over these kinds of distances it is not un- usual for metre-wide deviations to occur. Log data analysis shows if hole deviations have been caused by cracked zones or too high a feed force. If drilling was done properly then the cause of the deviation must be the condition of the rock. If so, changing the drilling equipment or altering the drilling set-up can make a considerable difference, avoiding costly and time consuming problems.
Studies carried out by Transtronic have shown that, in tests, the logged data gathered by the Inklinator Devilog corresponds well with the actual integrity of the rock through which the tunnel was blasted.

Founded in 1973
Transtronic was founded in 1973 developing and marketing simple directional instrumentation for the Swedish tunnelling market. Since then, the company's range has grown to include advanced angle measurement equipment for above-ground and tunnelling rigs and for under-ground production drilling as well as a wide selection of monitoring systems for all kinds of above ground and subterranean rock drilling operations. The company is currently expanding internationally through agreements with local agents.


Caption:
The Inklinator Devilog is said to be the first unit of its kind to combine automatic rock condition logging and hole deviation in a single package.


For further information contact:
Transtronic AB, Magnus Thele
Box 175
S-731 24 Köping,Sweden
Tel: +46 221 138 30
Fax: +46 221 190 50
















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