Millau Viaduct slightest movement in the Viaduct, and measure its resistance to wear-and-tear over time. Anemometers, accelerometers, inclinometers, temperature sensors are all used for the instrumentation network. Twelve fibre optic extensometers were installed in the base of pylon P2. Being the tallest of all, it is therefore under the most intense stress. These sensors detect movements on the order of a micrometre. Other extensometers, electrical this time, are distributed on top of P2 and P7. This apparatus is capable of taking up to 100 readings per second. In high winds, they continuously monitor the reactions of the Viaduct to extreme conditions. Accelerometers
Russky Bridge name. The bridge to Russky Island is the world's longest cable-stayed bridge, with a 1104 m long central span. The bridge also has the second highest pylons after the Millau Viaduct and the longest cable stays. The design of the bridge crossing has been determined on the basis of two primary factors: The piles were driven as deep as 77 m below ground and on the island side 120 auger piles were piled under each of the two 320 m high bridge towers. The pylons were concreted using custom self-climbing forms in pours of 4.5 m. A crane was used