ABSTRACT
ABSTRACT: Routine inspection detected a crack up to 10 mm in width in reinforced concrete (RC) pier C1-1034 of the Circular 1 Route (C1) of the Tokyo Metropolitan Expressway. As an emergency repair, the overhanging beam was removed and rebuilt. A subsequent inspection into the cause of the crack found that the anchor bolts used to install the brackets after the construction of the bridge had cut the reinforcing bars of the beam. Thus, for those piers to which a bracket was installed during the same installation project, further inspections of the reinforcing bars were conducted to look for defects. As a result, defects were confirmed in the reinforcing bar of many of the inspected piers. Reinforcement using outside cables was added to one pier (C1-1039), as 80% of the cross-section of its reinforcing bar was defective.
