Our
projects
PROJECT
Client
> Taylor Woodrow
Sector/Market
> Infrastructure
Services
> Monitoring – Structural Health
Location
> Leyton Station, Leyton High Road, London – UK
Project summary
Leyton Station (The Site) is located at Leyton High Road, London, E15 2BY. The project will entail the demolition and alteration of several existing structures, and the new scheme will be built in the area between platform 2 and the A12 retaining wall whilst a bridge structure will provide access to platform 1, with staircases at both platforms and lifts to ensure step free access is achieved throughout.
Leyton Station is a Zone 3, above ground, London Underground station which serves the Central Line. It is situated within the London borough of Waltham Forest and is located to the north of Stratford adjacent to the A12 and the A112 High Road Leyton. The Station is believed to have been built in the 19th century and there have been various alterations historically.
In its current form, the station comprises a Ticket Hall structure at A112 High Road level, with stair access provided down to the two platforms which serve the eastbound and westbound underground services.
The brief
Murphy Geospatial was appointed by Taylor Woodrow to carry out Track and Structural monitoring of buildings on the Transport for London (TfL) Central Line related to the construction phases of the renovation and improvement scheme for the Leyton Station Upgrades and Step Free Access (SFA) project, located in Leyton Station.
The instrumentation consisted of automated tilt sensors and monitoring reflector prisms for quarterly manual monitoring purposes. This enabled the Designer/ Engineer to control and manage risks to the Central Line eastbound and westbound tracks, retaining walls and station assets during the piling and construction of the proposed step free access project.
The challenges
We encountered several challenges during the installation phase:
- Rail track access time limitation: Only 4 hours of track access for installation which has significant impact to the installation work schedule.
- Rail track clearance: Leyton Station Upgrades specify that there is a track clearance of 63mm, measured from the top of the rail; any instrument installed on the track should not exceed the track clearance, but upon test measures, it was clear that this tolerance could not be met regarding the GMP104 monitoring prisms.
For this reason, a subsequent track clearance certificate submission was made to Leyton Station Upgrades, reducing clearance to 45mm from top of rail. This was approved subject to the necessary on site clearance checks by a T002 Handback Engineer.
- Relocation of Monitoring Points: Relocation of Monitoring Points are needed to stick with the construction sequence as hoarding established obstructing the Monitoring Points for baseline measurement.
Our work
For structural health monitoring, Murphy Geospatial installed a total of:
- 15 Tri-Axial Tilt Sensors
- 52 Angled Retro Targets
For track monitoring, Murphy Geospatial installed a total of:
- 44 Tri-Axial Tilt Sensors
- 42 Right-angled Retro Targets for platform monitoring
- 108 Track Prism along eastbound and westbound track
The Tri-Axial Tilt sensors were fully automated and connected to a Gateway, powered by a solar panel, providing real-time data through an online portal. The retro targets and track prism were manually surveyed by a Murphy Geospatial engineer.
Our team
Our monitoring team was structured to ensure efficient installation, maintenance, and data management. A project engineer was responsible for preparing and supervising the installation work, while two installation technicians carried out the instrumentation installation and provided ongoing maintenance. The survey team handled the setup, installation, and surveying of the monitoring network.
Overseeing the entire project, a designated project manager ensured that all instrumentation was installed in line with the client’s specifications. Finally, there was seamless communication with Taylor Woodrow, the client, providing them with project updates and regular updates on monitoring results.
Results
All tilt sensors and monitoring points were successfully installed and are fully operational at the designated locations. Baseline readings were completed before construction work commenced. Tilt sensor data can be accessed through a web portal, enabling real-time, seamless monitoring. In the event of a trigger breach or a critical incident, the client was prepared to take immediate action, ensuring timely interventions.
The success of this project underscores our reputation for delivering services that equip our clients with the data and information they need to make decisions at every stage. We draw on the experience and skills of our people to deliver certainty our clients can trust.
Contact
For more information on this project, please email info@murphygs.com or call us on +44 (0)192 362 4800