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Costain's Geotechnical Services Division (GSD) is expanding its services to include state-of-the-art surveying instrumentation and the sensor, known as a 'mote', is an example of the type of service it increasingly plans to offer clients.
The mote measures inclination, or movement, in structures and detects any widening of cracks. Such sensors already exist, but the selling point of the mote is that several can be linked together in a 'mesh wireless' network. This means that they can communicate via each other and then to a gateway that transmits data to a monitoring station via 3G modem.
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Should a problem arise with the wireless link between two sensors, they will create a new wireless pathway that avoids the problem area.
Other advantages of the sensors include high resolution – they can measure changes in inclination to 0.01° – very low power consumption that means their batteries last around a year and their ability to be installed very quickly.
The devices are the result of research by Cambridge University's engineering department, a member of which set up a company called Wisen to exploit the invention. Costain's Technical Director, Bill Hewlett, who has links with the University, came across the mote and realised it could be of use to the Group.
"We have a trial installation using four motes at one of the shafts in the Brighton and Hove project to bring cleaner seas to Sussex," said Senior Survey Manager, Nigel Drayton.
A group of 13 motes and two gateways is also operational at the Crossrail tunnel portal project at Pudding Mill Lane, East London, measuring any movement in two axes on a retaining wall.
Costain is also in the early stages of a project with Cambridge University to develop a mote using an infra-red laser to measure convergence in tunnels and shafts. This would be utilised on the National Grid London Power Tunnels project to monitor existing tunnels during tunnelling.
(CD/GK)
