Rehabilitation of old masonry dams at full reservoir level A comparison of successful rehabilitation projects

摘要

At the beginning of the last century about 40 gravity dams were built in Germany. During the last years extensive rehabilitation measures were carried out at several old masonry dams. Rehabilitation concepts which called for the construction of inspection/drainage galleries inside the dams turned out to be rather cost-efficient. Different methods for the construction of these inspection galleries were used - from manual driving of the tunnel to the drill & blast method and the use of a tunnel boring machine. The specific costs of these galleries varied, depending on the construction method.