What is the function of drainage troughs located under open joints?

The function of drainage troughs located under open joints is primarily to divert runoff away from components. Open joints can allow water to enter various structural elements of the bridge, which might lead to deterioration, corrosion, or other types of damage over time. The drainage troughs effectively channel this water away from critical areas, helping to protect the integrity and longevity of the bridge’s components. By managing the water flow, they reduce the risk of pooling and ensure that the bridge remains safe and functional.

While structural integrity, water retention, and support systems are important considerations in bridge design and maintenance, these are not the primary functions of drainage troughs. Their essential role lies in directing water away, thus preventing potential issues associated with moisture buildup around sensitive areas of the bridge. This focus on water management underscores the need for proper drainage systems to maintain structural health.