Procedure esecutive in presenza di convogli eccezionali su ponti stradali privi di documenti progettuali

This paper concerns the procedures used to verify the allowability of the transit of track live loads on four existing bridges along the road S.S. 640 Agrigento-Caltanissetta, in order to move some parts of the Tunnel Boring Machine (TBM), used for the tunnel construction of the Galleria Caltanissetta. We describe the inspections and surveys performed, in order to obtain the geometric configurations, the tests on the concrete and on the reinforcing steel. Furthermore, with reference to design code at the time of construction, we scheduled the load tests by using tracks that induced stresses similar to TBM components loads.On the bases of the tests results the owner (ANAS) authorized the transit on the four bridges of convoys consisting of 20 axes, having a total weight not more than 3670 kN.