Schierstein Bridge - Renovation

Renovation

Over the years, the bridge has had to handle an ever-increasing traffic load, but, with the exception of re-painting, conservation measures were not carried out. In 1995, testing indicated that there had been extensive damage to the bridge, primarily from corrosion. It was concentrated mainly the areas of transition between structures and expansion joints, where water was able to infiltrate. Surface cracks and damaged areas of the deck sealing also allowed localized high chloride stress in the concrete. Although the viability and stability of the bridge were only partially affected, urgent repairs were needed to ensure its continued usability and durability.

These were carried out between 1997 and 2000 at a cost of 21 million euros. The repair work was carried out in three stages. In Stage 1, the entire deck sealing, pavement, and walking/cycling paths were completely renewed. The areas of the road surface with chloride damage were removed. The upper 4 to 6 cm of the surface was replaced and a new waterproofing system installed. Subsequently, an asphalt surface was laid.

In the second stage, the bearings of Structures 1 through 5 were repaired. The heavily polluted roller bearings were completely replaced. The needle bearings (compact roller bearings) were opened and cleaned and the abrasive contact surfaces were reground. The bearings were then greased and closed again.

In the third stage, the sidewalks in the steel bridge area were replaced. Also the existing 1.00 m high aluminum railings without ropes were replaced with 1.20 m high steel railings with ropes in order to satisfy current safety codes. The old rubber seals on the expansion joints were also replaced.