Zetica unveils MagDrill-Plus, a safer, faster and cheaper method of UXB detection.
Zetica has introduced MagDrill-Plus for more efficiently clearing pile or borehole locations of potential unexploded bombs (UXB) where surface based geophysical methods and a CPT-based MagCone technique are unsuitable.
MagDrill-Plus is a result of over 2 years of research and development with the University of Liverpool and involving our drilling partners, Norwest Holst, which has resulted in a wireless detection system which utilises novel magnetometer technology and advanced material technology to scan while drilling.
In soft soil conditions, MagCone is the technology of choice. However, where a thin layer of soft soils overlies dense materials or dense materials occur close to surface, MagCone is not able to penetrate to the required depths to clear a location of the threat of UXB. It is estimated that approximately 40% of the Greater London area is thus affected.
The current alternative to MagCone to locate deep-seated UXB which are beyond the detection range of surface methods, is MagDrill. This is based on rotary percussive or similar drilling techniques and involves scanning the borehole in stages as it is drilled. The method is relatively slow and costly.
Alarmingly, some in the industry have compromised on safety by offering a ‘blind’ drilling service. This involves drilling a borehole without regard to the presence or absence of a UXB within its zone of influence and then scanning the hole for bomb targets only once the borehole has been completed. This is a very dangerous activity no matter what reassurance is provided about the possibility of detonating a bomb if you hit one!
In some cases, where ground conditions are anticipated to be variable, both MagCone and MagDrill techniques are used together. The big disadvantage is the cost of operating two rigs and the impact on productivity.
MagDrill-Plus is a new service providing a single technique that can cope with dense soils and which offers up to 3 times the productivities achievable using current accepted MagDrill practice. The improved productivities are based on continuous detection during drilling which also makes the drilling process safer.
For more details contact Mike Sainsbury at email@example.com.