CATHODIC PROTECTION OF CONCRETE CAISSONS AND DECK OF A SHIP REPAIR YARD

摘要

Two types of impressed current cathodic protection and a sacrificial method were used to protect over 100,000m2 of reinforced concrete caissons and deck slab of a new ship repair yard. The structures comprised of 53 caissons weighing 4,000 tonnes each forming over 2km of quays and piers. The specification required that the systems were monitored using Reference Electrodes and current pick up probes. All current adjustments and monitoring was carried out from one central location. This paper describes the CP and monitoring systems used and compares the monitoring results from the different types of CP system and monitoring probe. Slip forming of the pre cast caissons presented unique problems that had to be overcome and the sheer size of the installation made monitoring and performance testing a challenge. The performance of the CP systems and the remote monitoring and control system are discussed in detail.