Outcome This was a complex and highly sensitive project, which required the use of remote monitoring solutions to enable measurement without attaching reflectors to the building façade, and other technical innovations to transmit data wirelessly from various sensor types.
Solution In addition to the building and environmental monitoring, Murphy Geospatial was also required to monitor the structural health of 600 m London Underground tunnels. They did this by installing 250 Senceive tilt sensors in sections of five sensors around the circumference of the Jubilee Line tunnels and optical automatic total stations for the larger open tunnel sections of the Hammersmith and City Line. The long distance to the next station required ingenuity for the monitoring data transmission. The limited diameter of the tunnels and the proximity of excavation works needed special, newly developed algorithms to automatically calculate the deformation, heave and settlement of the tunnel structures. All sensors were managed remotely from Murphy Geospatial’s London office and the three integrated cameras enabled visual oversight of the site works.
In order to reliably relay sensor data to communications gateways located at tube
stations many hundreds of metres away, Senceive recommended the use of a fibre optic cable. This enabled the FlatMesh™ tilt sensors to report at high frequency and was found to be “a reliable and elegant solution” by the Murphy Geospatial team. By combining technology and software from Leica Geosystems and Senceive, Murphy Geospatial was able to developed the so-called ‘patch scan’ solution. This has been adapted by the industry in new specifications for large-scale monitoring projects, avoiding drilling holes into a façade and reducing installation times.
This project was shortlisted for both construction and tunnel awards.
Figure 3: Jubilee Line 3D model with Senceive’s tilt sensors
Figure 1 & 2: 3D movement model from Senceive’s tilt sensor data before and after demolition, showing heave of tunnel
Source: Bowles & Wyer
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