Abstract: The proposed Chashan Highway was designed as the First-Class Highway elements and considering the Urban Artery functions. It under crosses the Jiangzhao Expressway at K9+082 with an acute intersection angle 30 degrees on a gentle profile with an oval geometry. Piers of the Jiangzhao Expressway Overpass were located in the median area of divided Chashan Highway. In order to maintain a safe operation of Jiangzhao Expressway during the construction, a bridge stability monitoring system was established at the bridge piers with the active traffic above them. The monitoring results were analyzed for the stability evaluation of the existing bridge structures. The monitoring and evaluation results could also provide the basis for the design and construction of necessary stability mitigation measures. To ensure the safety of the construction activities and the safety of the traveling public, safety facilities, such as, reinforced concrete crash barriers, speed limit signs, deceleration markings, isolation barriers, were installed in the construction zone on the Jiangzhao Expressway Overpass.

Key words: Bridge Piers, Monitoring System, Stability Evaluation, Safety Facilities