As part of the Earthworks Monitoring (Southwest Territory) Contract, MLM Consulting Engineers Ltd, working on behalf B&M McHugh Ltd & Network Rail, tasked Vision with Monitoring the movement of two areas of cliff face, both adjacent to Brighton Train Station, in a safe and controlled manner.
This initially presented three challenges that we had to overcome; ensuring the safety of our staff carrying out these works, the method of measurement of the actual cliff face, ensuring that there was no disruptions to the train services utilising the adjacent tracks.
In collaboration with Leica Geosystems, Vision presented an innovative method to eliminate the H&S risks traditionally associated with this type of work, safeguard our staff and prevent any disruption to train services. This was achieved through utilising a new instrument, the Laser Scanning Leica NOVA MS50.
With this new technology, surveyors were able to provide a solution that would fulfil all the requirements of our client, MLM Consulting Engineers Ltd., whilst also realising other benefits;
* Improved Efficiency & Accuracy
* Reduction of site-based time
*Substantial Cost Savings to the Project
The LEICA NOVA MS50allowed us to undertake this monitoring by scanning the cliff from a series of positions away from the track. Each position was referenced to a network of control points created with the same instrument, allowing the scans to be based on the same reference after processing the data. Subsequent visits to the site, at agreed intervals, allowed future scans to be overlaid on the previous scans, so a comparison could be made and any movement of the cliff face identified
The advantages of using the new instrument LEICA NOVA MS50, basically an instrument, was that Vision were able to setup the network of control points, process the results, carry out a basic topographic survey of the boundary of the site, process the data, and finally on the same set-up carry out a laser scan of the cliff faces. In being able to process the scanned data on site using the instrument screen, we were able to confirm and check that all areas relating to this project had been captured before finally leaving site.
The precision in terms of the monitoring had been specified as detecting any movements higher than 10 mm over a given period of time. The LEICA NOVA MS50 is more than capable of meeting and exceeding the required specification and is a fantastic addition to Vision