Project Summary
PROJECT NAME: Dunlaoghaire Central Library. YEAR: 2012
CLIENT: John Sisk & Son Ltd – Irish Rail
Overview
NVM Limited was requested to provide a structural and environmental monitoring proposal to John Sisk Builders with reference to the continuous real time monitoring of the Dun Laoghaire Bray Rail Line at the proposed development of a new Central Library for Dun Laoghaire Town Centre.
NVM Limited installed a series of independent monitoring instruments at pre determined locations on the Tunnel structure on the Irish Rail (Wexford Line) Dun Laoghaire, to monitor movement of the tunnel wall during the initial ground works of the proposed Dun Laoghaire Library Development
Monitoring
The purpose of the installation was to set up instrumentation which will enable the company to provide a real time (Structure Diagnostics ) monitoring system to the client and Iarnród Éireann, in relation to the Tunnel structure, this will provide constant monitoring for the effects of movement during the initial ground works and rock breaking schedule of the proposed works.
Pre determined limits were set on the logger and if tolerances exceeded an email/text alert was sent to relevant parties.
Products Used
- Svan 977 Environmental Noise Monitoring
- Instrumentation. Vibrock Structural
- Vibration Monitoring
- Instrumentation.
- Geosense Tilt monitors Geosense Data logger system
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Project Summary
PROJECT NAME: Lansdowne Road Bridge, Dublin YEAR: 2011
CLIENT: Irish Rail
Overview
NVM was asked to propose a monitoring system to aid with the stabilization of a live rail bridge in Dublin.
This monitoring was required during the stabilization and remedial works following flood damage to the bridge structure after heavy rains in October 2011.
The bridge is a single-span under bridge on the Dodder River, south of Lansdowne Road in Dublin 4.
Monitoring
NVM Ltd was commissioned to supply and install tilt and settlement monitors for the duration of the contract.
24/7 monitoring of the bridge was required during the works.
Daily reporting on bridge movement was done through a data logger which also triggered an alarm if tolerances were exceeded.
Products Used
• Bi-axial MEMS Tilt monitors • Electrolevels monitors
• Data Logger
• Vibration system
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Project Summary
PROJECT NAME: UCD Science Centre, Dublin YEAR: 2011
CLIENT: John Sisk & Son Ltd
Overview
The development consisted of the construction of a state-of-the-art scientific building.
Due to its close proximity to the existing UCD campus, environmental monitoring was required during the construction phase.
Monitoring
NVM Ltd was commissioned to supply and install environmental monitors for the duration of the contract.
The project achieved a BREEAM Excellent Rating at Design Stage.
As construction works were to take place quite close to existing laboratories used by UCD, NVM Ltd was asked to install a vibration system sensitive enough to measure activities in the laboratories.
Due to this requirement, NVM Ltd employed a Svantek hurricane vibration monitoring system. NVM Ltd was responsible for the monitoring of all environmental instruments. Weekly reporting was carried out on all aspects of monitoring.
Products Used
• Noise monitors
• Vibration monitors • Dust monitors
• Hurricanesystem
Testimonial
“NVM were contracted to undertake environmental and vibration monitoring within UCD science facility on behalf of John Sisk and Son LTD. This involved complex interfaces and monitoring within existing research science facilities, which were always performed to an excellent standard, for both technical support and on-site and off-site consultation. We would highly recommend them and look forward to working with them in the near future.”
Pat Braham,
Assistant Contracts Manager, John Sisk & Son Ltd
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Project Summary
PROJECT NAME: Fullabrook Wind Farm, Bittadon, Devon YEAR: 2010
CLIENT: John Sisk & Son Ltd
Overview
Fullabrook Wind Farm in Devon is operated by Devon Wind Power Ltd, a subsidiary of ESB International and consists of 22 turbines. It is England’s largest onshore wind farm and ESB Wind Development’s first wind farm construction project in Great Britain. Construction of the 66MW wind farm took place in 2010 and the wind farm has been producing green electricity for export to the grid since autumn 2011.
Each turbine is 65 metres high to the hub with 45 metre blades, making the total height of the turbines 110 metres to the tip of the blade.
Monitoring
NVM Ltd was commissioned to supply and install thermistors in the concrete base and pedestal of each turbine.
Each thermistor was monitored by a datalogger and results were downloaded daily.
NVM Ltd designed a user-friendly plug-and-play system for the client. Results from testing could, therefore, be accessed immediately.
Products used
• Thermistor strings: 10 thermistors on each string, 22 strings (pedestal), 22 strings (base)
• G222 thermistors 3kohm 25c +/- 0.1k accuracy
• Cable, 10 pairs
• X20-103 multi-point connection
• 20pt connector for logger case
• 10 channel vibrating wire data logger • Weather-proof enclosure
Testimonial
“We have recently used NVM on two consecutive wind farm projects in the UK. We were provided with an excellent on-site setup service as well as good off- site backup and technical support. We found the apparatus and equipment supplied to be very robust and reliable in extreme environments. We look forward to working with NVM Ltd in the future.”
Alan Donnelly,
Site Agent, John Sisk & Son Ltd
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Project Summary
CLIENT: Trinity College Dublin
Overview
NVM Ltd was commissioned by Eric Farrell of Trinity College Dublin and the National Roads Authority (TCD/NRA) to provide the instrumentation and expertise to carry out the Vacuum Preloading Field Trial at Ballydermot Bog.
NVM Ltd, in close affiliation with Geosense Instrumentation UK, provided monitoring instrumentation and in situ backup during the trial. The main objective was to evaluate vacuum preloading as a technique for improving peat ground and its feasibility for improving conditions and reducing the maintenance costs for bog roads and rampart roads.
Vacuum preloading is a construction method used to accelerate settlement and increase shear strength by applying a vacuum pressure to the ground by means of prefabricated vertical drains, an impervious tight sheet and a vacuum pump. Consolidating the ground by applying a vacuum load has several advantages over other techniques, for example, no fill material is required, construction periods are generally shorter and there is no need for chemical admixtures.
Monitoring
The TCD/NRA Vacuum Preloading Field Trial commenced on
30th November 2009.
The vacuum preloading field trial test covered a 10x10m surface area. Initially, 0.4m depth of the fill layer was excavated over a 12x12m area and levelled. It is important to note that all depths are taken from the original ground level. Ninety-eight prefabricated vertical drains (PVDs) were pushed vertically into the peat to a depth of 2.65m using the bucket of a bog digger and an aluminium box section as the lance. This left approximately 1.35m depth of peat between the base of the PVDs and the peat-clay interface to prevent the escape of the vacuum.
The TCD/NRA Vacuum Preloading Field Trial was implemented by NVM Ltd and showed that this technique can be successfully used in peat soils. This was the first time that this technique was used in Ireland.
Products Used
• Push-in vibrating wire settlement cells
• Push-in vibrating wire piezometers (calibrated for both positive and negative pressures)
• Surface barometer/thermometer • Stand pipes to monitor the
ground water table level
• Water meter and rain gauge • Datalogger
Testimonial
“On top of reliable, accurate and easy-to-use instruments, I have always found somebody willing to help me every step of the way, from the system design to the installation and monitoring, with a friendly attitude, whether over the phone or on site, even in the worst winter we have seen in 40 years.”
J.P. Osorio Salas (BEng, MEng), Geotechnical Research Group, Department of Civil, Structural and Environmental Engineering, Trinity College Dublin
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