Patent ID: 7366634

Claim:
A gantry for use in the construction process of bridges, viaducts and other structures, said gantry comprising: an essentially elongated main structure; at least one unbonded cable with one end secured to said main structure by a first anchorage and the opposite end of said unbonded cable secured to a different location on said main structure by a second anchorage; an actuator resting permanently between said main structure and said unbonded cable; at least one sensor unit capable of noting measurements of physical variations on said main structure and communicating said measurements to an electronic interface which converts them into readable data accepted by a controller that controls the extension of said actuator, such that said actuator extends or retracts in order to increase or decrease, respectively, the tension of said unbonded cable in accordance with an increase or decrease of the loading or internal forces present on said main structure.