Movement, Vibration, Noise & Dust
A Typical Smaller Monitoring Project
Where Movement & Environmental Monitoring are required, this study details a typical project requirement.
The below details a regime that may be used on a smaller project. It details a manual monitoring solution for movement readings. A larger project could be set up with a ‘real time’ automated web based system.
3D Movement Monitoring of Adjacent Assets using a Total Station.
This involves adhering small reflective monitoring targets to the existing buildings. This would usually be the façade that faces or is closest to the site. A number of survey control points would be set up away from the monitoring targets and ‘outside of the zone of influence’ of the works. Periodic monitoring readings would be taken, related to the position of these control points.
Typical Installation Points
Trigger Levels – that amount of movement that is deemed to be a problem, should be calculated by the contractors consultant engineer prior to works commencing.
Prior to work beginning a minimum of three sets of base readings should be taken to the monitoring targets, ideally over a couple of weeks before any site work starts. The resultant readings would be used as base readings to compare to subsequent readings, taken during the works.
Results would be provided in an excel spreadsheet report showing differences to base in both tabular and graphical formats – see below – as well as target location photos. Any trigger levels that are breached will be highlighted.
We would normally expect readings to be taken periodically, on a shedule supplied by the structural engineers. Additional readings can be taken when particularly invasive activity is being undertaken close to the existing buildings – deep excavation or piling works being examples.
This usually involves installing a triaxial vibration sensor in the building on the basement (if there is one) or ground floor slab. This sensor will detect any changes in the vibration levels at the existing property.
The sensor would be running 24 hours a day and can be set up to record data during the working hours of the site. Data is presented on a live webpage in graphical format for “real-time” viewing. Email and text message alerts can be sent out should trigger levels be breached. Mains power is required.
Noise and Dust Monitoring
Similarly to the vibration monitoring, noise and dust can be monitored 24 hours a day if it is thought that the site activities will cause issues. These sensors would be installed between the existing building and the site.
The sensors would be running 24 hours a day and can be set up to record data during the working hours of the site. Data is presented on a live webpage in graphical format for “real-time” viewing. Email and text message alerts can be sent out should trigger levels be breached. Mains power is required.
Contact Clif Webb HERE or call +44 (0)203 651 7549 to discuss how we can assist your project.