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1. Index
2. CMCS at BRE
3. Development of AMS
4. Non-destructive testing of Marine Jetties
5. Fixed sensor monitoring of Diaphragm walls
6. Monitoring Buildings during Redevelopment
7. Tunnel Monitoring
8. Embankment Systems
9. Loggers
10. Tunnel Distortion Monitoring
11. In-place tilt monitoring system
12. Tunnels Interaction System
13. Re-Development of Small Properties
14. Viaducts
15. DLR at Mansion House
16. Tunnel Monitoring System (Discrete beams)
17. CTRL 240
18. Dams
19. Electro-levels
20. Movement indicators
21. Results of Charing Cross Load Cells
22. Non-destructive testing of concrete structures
23. Radio in Construction Monitoring
24. Settlement Reducing Piles
25. Land Surveying and Total Station Monitoring
26. Vibration Monitoring
27. Monitoring the complete strain history of concrete elements
28. Past CMCS Projects

Full x-y profile monitoring

In the late 1980s G Price designed and installed 18 tunnel convergence-monitoring systems in London Underground Limited (LUL) running tunnels at the Angel. The systems were designed to monitor distortion of the lining during the construction of three new step plate junctions. The photograph below on the left shows the curved beams used to monitor convergence fitted into the lining segments of the LUL running tunnels. The diagram below on the right shows the large 6 m diameter step plate tunnel capturing the smaller 3 m running tunnel. To monitor the convergence each of the five beams making up the system was fitted with an electro-level (EL) with a resolution of 1-arc seconds and linear movement transducers, resolution 0.01mm. The system could detect movements from 0.1 to 100 mm change in tunnel profile.

As the step plates were constructed and the lining of the running tunnels captured, the systems were moved to new locations in advance of the step-plate working face. The photograph (right) shows an 8m Railtrack tunnel in which 6 systems were installed for Gleeson Ltd during grouting behind the lining. The curved stainless steel beams were fitted to the profile of the brick tunnel.