Mavi Srl Deploy their Enerpac EVO Multi-Point Synchronous Lifting System for Retro Fit Work on E25 Bridge Bearings
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Leading Italian civil engineering company, Mavi Srl, has deployed its Enerpac EVO multi-point synchronous lifting system for bridge bearing retrofit work on the Savio viaduct between km 168 and 222 of the SS3 bis “Tiberina”, or E45, route in the region of Emilia-Romagna, Italy. Operating 12 Enerpac high tonnage, hydraulic cylinders, the EVO system is enabling Mavi to safely install new seismic isolators by synchronously lifting, holding and finally lowering the bridge decks.
Located above the Savio riverbed, the 1,890m long viaduct follows the narrow, winding valley with spans ranging from 85m to 110m resting on piers between 7m and 60m in height. Retrofitting the viaduct involves replacing all existing bearings with unidirectional and multidirectional seismic isolators designed and manufactured by Mavi Srl, and with friction pendulum isolators manufactured and supplied by another leading Italian company.
Scaffolding in position on pier 19 of the Savio viaduct ahead of installation of Mavi seismic isolators.
Working from pier to pier, Mavi uses the Enerpac EVO and 600 tonne capacity cylinders to simultaneously raise the two bridge deck ends resting on each pier, allowing access to the new bridge bearings. Loads at the end of each span range from 1,224t to 6,300t for piers 17 and 18, and 6,600t for pier 6.
“Lifting the bridge decks is a precise operation that requires careful and accurate control,” said a Mavi Srl spokesperson. “The combination of Enerpac’s EVO synchronous lifting system and high capacity cylinders means we are able to confidently lift loads that in some situations exceed 6,000t.”
The Enerpac EVO systems combines high-pressure hydraulics with a PLC-system to monitor and control precise movement and positioning of heavy loads. It allows a single device to control the entire lifting operation, providing status updates at every point of the process, without the need for manual monitoring.
Synchronised control of the hydraulic cylinders from the Enerpac EVO system.
For the Savio viaduct project, the Enerpac EVO control unit allows the 12 cylinders to be operated at differentiated pressures and constant volumetric rate, ensuring controlled lifts without inducing flexural-torsional stresses to the bridge deck.
The other key EVO features for this project include the pump’s ability to read stroke sensors, allowing the computer to read exactly how high the deck has been lifted, as well as control the pressure in each jacking cylinder to ensure a synchronous lift. Lifting is carried out with constant control and monitoring by means of centesimal measurement transducers and remote reading on digital equipment, up to a maximum of 10/12mm.
Featured Title Photograph
High capacity hydraulic cylinders controlled by the Enerpac EVO system supporting a Savio viaduct bridge deck
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