Our experience working for transport and infrastructure related projects – including for Irish Rail, LUAS, Dart, Crossrail, Network Rail, DLR and London Underground – enables us to deliver on survey requirements for the preliminary design, establishment of a control network, monitoring, laser scanning and BIM.
Murphy Surveys are experts in monitoring of railway, ground and building movement, settlement, and vibration and noise, with reporting and alerting capabilities. We monitor and investigate geo-referenced movements and displacements in 2D or 3D, above and below ground.
Providing Monitoring Survey Services, we have sucessfully completed projects at
- Bond Street Station
- Tottenham Court Road
- Farringdon Station
- Pudding Mill Lane
Exclusive Monitoring Survey Techniques
We combine a variety of monitoring sensors through our Monitoring Surveys, e.g. total stations, level sensors, laser scanners, tilt sensors, and geotechnical sensors, to monitor displacement, deformation, strain, and vibration. All data is recorded and analysed in one geo-referenced monitoring database, from which we can generate reports, raise alarms, and share data online with the client.
Our monitoring services are critical to ensure that construction works stay safely within the specified limits for projects and tasks such as:
- Tunnel construction
- Rail and road
- Bridges and structures
- Quarries and surface mining
- Landfill settlement
- Post Construction
- Demolition Works
- Pyrite Damage
- Settlement and displacement
- Naturally caused land movements
Benefits of Monitoring Surveys
- Prevent disaster with real-time data and alert systems.
- Reduce insurance premiums with proactive control of a hazard related to possible change or failure of a structure. Policy holders can reduce risk exposure before and during construction, and throughout the life-cycle of the structure.
- Enable safe underground construction, tunnelling and excavation.
- Virtual spatial recording of an excavation profile enables significant cost savings due to quality improvements and the optimisation of concrete strength. The accurate measurement data produced can also be used for billing, geological purposes, evidence, and deformation analysis.
- Optical 3D displacement and deformation monitoring supports the graphical interpretation of a structure’s behaviour with accurate measurements, whilst not disrupting construction works.
- Fully automated monitoring systems available with real-time alarm functionality in our Monitoring surveys.
Monitoring Survey Solutions
Our monitoring solutions help asset owners to protect their structures and installations. The client can access the monitoring data online and can receive alarm messages via email and SMS. In most cases, ground movement monitoring systems are provided with remote access to the data and the ability to generate alarms (by email or SMS) if trigger levels are exceeded so that remedial action can be taken if necessary.
Wall Movement | Settlement | Ovalisation | Escalator | Elevator | BIM | Line & Level | Track Monitoring
All the data are stored in one monitoring data base which can be accessed over the internet and provides interfaces to 3rd parties as Crossrails UCIMS.
We offer monitoring solutions for the construction of new tunnels, shafts and cross passages or for deep excavation and piling works near any buildings and structures which could compromise their structural geometry and stability.
Primary & Secondary Systems
We design and provide independent primary and secondary tunnel and site monitoring systems to ensure that a robust backup system is present in the event of any alarming reading therefore ensuring the double check of movements and preventing loss of data in case of any technical failure of a monitoring component.
Our staff has been trained for site works as well as NR, LUL, DLR and other railway services to carry out installation works of monitoring sensors and equipment and to manually survey and monitor.
All data are collected in Geodata’s KRONOS tunnel monitoring database which can be accessed over the internet. The monitoring software caters for alarming and sophisticated alarm filtering in conjunction with daily update of the construction progress for small to large scale construction projects
Bridge and Track Monitoring
We provide solutions for initial bridge laser- and hydrographical surveys, pier and deck monitoring as well as scour- and sonar monitoring.
Our hydro graphic department enables us to access and inspect river bridges and costal viaducts and the BIM team can carry out above water Laser scanning and collect condition data by using our Field BIM software.
Our tilt sensors and strain gauges are highly reliable and are ruggedised to withstand weather and seawater. Usually we combine horizontal and vertical tilt sensors with seismic sensors and possible ATS (automatic total stations) which are employed in locations of potential settlement or even collapse to detect any movement. Tilt sensors are typically installed on the abutments and piers and ATS used to monitor the road deck or railway tracks.
The measurements to the observation points are carried out at arbitrary intervals from mobile total stations at fixed positions. The measuring points are fitted with suitable targets (glass prisms). The survey is controlled via the EUPALINOS software system and is based on the automatic target recognition capability of modern total stations. Consoles or pillars are used to accommodate the instruments and, if necessary, they can be re-calculated and controlled by free stationing in the course of the measurements. Instability of observation points is strictly compensated via a balancing calculation, optionally also taking into account the distance scale. In this way, given a suitable survey configuration, meteorological data are not necessary.
If required, multiple total stations can be combined in a network to monitor widely dispersed areas. In this case the data from the individual measuring stations are transmitted to a central server via (radio) LAN or ISDN and administered in a database. The data are also independently stored on the specific control computer of the individual measuring stations. Depending on the configuration, output of diagrams and the triggering of various alarm procedures are handled locally by the EUPALINOS software, or centrally by the KRONOS database system.