We also can also join up with link up approved geotechnical engineers to proved borehole sampling, Piezometers and inclinometers.

Our service to you:

• Innovative solutions to monitoring problems since 1991
• All staff are PTS qualified, and we are Proof Audit / Linkup / BSI / TSA / RICS / ICES accredited
• Cost effective construction of targets
• Stable Monitoring Pillars contracted to minimise errors.
• 24 hrs / day track monitoring (two or three surveyors working in rotation)
• Hourly, daily, weekly or monthly intervals
• Real time solutions available
• Working countrywide
• Using latest Trimble S6 magdrive robotic total stations for accuracy and efficiency

Monitoring visits are manned by surveyors with systems set up to provided checks on potential observational errors - making sure false alarms are not raised. We are well aware of the speed restriction / line blocking implications of track movement.

Since 1991, we have developed a particular specialisation in the field of remote monitoring of rail track during construction work. In 1997 we introduced a remote system and have been using it regularly ever since. Our remote system of monitoring is not fully automated; but in most construction projects it is not possible to leave expensive survey instruments unattended day and night. We prefer to carry out the monitoring measurements, using a reflectorless total station, in person, transmitting appropriate information to our clients as soon as the have been measured. All staff are PTS trained.

A sample of successful monitoring projects includes:

• Crewe - Pipe jacking below WCRM. 7 days, 80 targets, every 30mins.
• Standish - Pipe Jacking below WCRM. 5 days, 60 targets, every 30 mins.
• Althorp embankment - Wooden stakes in sloping ground, monthly measurements for 1 year.
• Bedford - Bridge structure monitoring, monthly for 2 years.
• New Street Station - Stour Tunnel. 150 targets. Emergency monitoring regime every night for 8 weeks.
• Paddington Station - Bishops Bridge Road project. Project surveyors on and & off for 2 years. Up to 300 monitoring targets total for tunnelling going under full width of station.
• Llanelli - 2 sites on same project. 300 targets. Set up monitoring regime then taught client engineer to continue twice daily measurements. Ongoing project
• Cardiff - 80 targets. Ongoing project. Measurements every 2 hours for 4-5 days.

All monitoring projects depend on a stable monitoring location. We build concrete pillars where possible. Our survey system checks the position of this survey station prior to each set of monitoring readings and makes use of the updated geospatial position; thus an unstable monitoring point will still produce good results.

Deliverables include:

• Real time movement reports
• Onsite spreadsheet analysis (X, Y, Z changes)
• 3D DXF of rail alignment changes
• Isopachyte contours for surface deviations (in ‘mm’ or ‘m’ depending on areas covered)
• 3D scan clouds for complex surfaces – see laser scanning page