Customer Stories

Achievable Monitoring

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"The S9 and T4D Lite have enabled us to deliver exactly what the structural engineers require, all within their specified 24 hour period." Jordan Knight, Greenhatch Group Case Study Customer: Greenhatch Group Project: 5 year monitoring project in an historic part of London Solution: Trimble S9 and the Trimble Access Monitoring Module area, along with surrounding restaurants, offices and listed buildings are closely monitored during the early demolition and piling work. Access on site is restricted and additionally the client required all the information to be in the hands of its structural engineers within 24 hours of collection. The deliverable was to include 2D analysis graphs and x,y,z values for any detected 3D movement along with their delta values. Jordan decided that the best monitoring method for this work would be a semi-automated system using a Trimble S9 1" Total Station and a TSC3 logger running Trimble's specially developed Monitoring Module which can be added onto Trimble's Access field survey software, along with Trimble T4D Lite to present the data and create the deliverables. Jordan knew from previous experience that the Trimble S9 was a fast and above all, reliable instrument thanks to its MagDrive, SurePoint and FineLock technology* and that when combined with the Trimble Access Monitoring Module 1** and TD4 Lite, he would have a solution that would deliver exactly to the client's specification. Convinced of the system's speed and reliability, he felt confident that all the survey work could be undertaken with just one day on site rather than the two days predicted by other companies. This time saving would not only reduce cost for the client but also the additional logistics that two days on site would require and Jordan believes that this helped secure the contract for Greenhatch. As with many monitoring projects, this job did not require the continuous, real-time 24/7 measurements a fully remote system would supply. Therefore, during the early stages of the work Greenhatch engineers would visit the site once a week. On each visit, the engineer would use the Trimble Access Monitoring Module to collect the data, analyse it whilst still in the field to pick Demand for monitoring is on the rise. Ageing infrastructure, construction projects, particularly those in built-up areas, and natural events require improved awareness of movement if sites and surrounding buildings are to be kept safe. It's a critical component in today's project environment and for those survey practices prepared to undertake this work, an opportunity to expand services and add new clients. For Greenhatch Group, an evolving practice that offers a range of survey and engineering services through its three UK and one European office, it is not unusual to have between ten and fifteen monitoring projects running simultaneously. Governing the choice of system for each of these projects is the level of sophistication required for the deliverable along with each individual site's logistics. Whilst Greenhatch Group has an extensive survey portfolio at its disposal, it has a 'horses for courses' approach when it comes to selecting the most suitable monitoring system for the client's requirements. These choices range from fully automated real-time systems using Trimble's high accuracy S9 1" Total Stations combined with Trimble 4D Control monitoring software (T4D) to semi- automated systems using a very cost- effective web portal version of the software, T4D Lite. The company also has a Trimble SX10 Scanning Total Station which is used on monitoring jobs where there is no clear indication as to where targets should be placed such as on a bowing building, retaining wall, or simply as a backup to other methods. One of Greenhatch's current monitoring projects sees Engineering Manager Jordan Knight running a 5 year job in an historic part of London where the original Roman settlement was based. The work involves the demolition of old buildings and the construction of new student accommodation and public exhibition spaces which will showcase the area's renowned Roman Wall. Site logistics and client deliverables dictate system choice This project is still in its initial phases and therefore Jordan's current focus is to ensure that the Roman Wall and basement Achievable Monitoring A move into monitoring can be achieved on almost any budget thanks to a new era of software that allows for the collection, display and analysis of data without the need for a real-time monitoring system.

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