A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Waterstop technology for the 21st Century
This paper introduces a new method of repairing failed waterstops in aging concrete dams. Waterstops are an integral part of joints for concrete dams. Concrete structures are subdivided into independent monoliths. The presence of joint control cracking of the mass concrete by focusing monolith movement and thermal volume changes at the monolith joints. As a result the joints are vulnerable locations were leakage through the structure is probable. To prevent leakage, materials in various configurations have been installed at monolith joints to block the migration of water along the joint. Typically waterstops for mass concrete gravity dams are installed in conjunction with downstream joint drain systems. The drains intercept any water that may bypass the waterstop and divert it to an appropriate location; often to a drainage gallery at a low elevation in the structure. Waterstops materials and other joint systems have included copper, rubber, asphalt, and more recently PVC. The success of these materials is probably more dependent on the installation techniques and the range and frequency of joint movement than the actual material forming the waterstop. There have been many situations where waterstops have failed to perform. In most cases, repair of these waterstop failures has been a difficult and expensive process that may include extensive drilling and complex mixing and pumping of grout materials. Commercial diving is necessary for installation of surface-applied membranes and other upstream face treatments. While there have been many successful waterstop repairs, success has been limited and very costly for the more challenging conditions.
Waterstop technology for the 21st Century
This paper introduces a new method of repairing failed waterstops in aging concrete dams. Waterstops are an integral part of joints for concrete dams. Concrete structures are subdivided into independent monoliths. The presence of joint control cracking of the mass concrete by focusing monolith movement and thermal volume changes at the monolith joints. As a result the joints are vulnerable locations were leakage through the structure is probable. To prevent leakage, materials in various configurations have been installed at monolith joints to block the migration of water along the joint. Typically waterstops for mass concrete gravity dams are installed in conjunction with downstream joint drain systems. The drains intercept any water that may bypass the waterstop and divert it to an appropriate location; often to a drainage gallery at a low elevation in the structure. Waterstops materials and other joint systems have included copper, rubber, asphalt, and more recently PVC. The success of these materials is probably more dependent on the installation techniques and the range and frequency of joint movement than the actual material forming the waterstop. There have been many situations where waterstops have failed to perform. In most cases, repair of these waterstop failures has been a difficult and expensive process that may include extensive drilling and complex mixing and pumping of grout materials. Commercial diving is necessary for installation of surface-applied membranes and other upstream face treatments. While there have been many successful waterstop repairs, success has been limited and very costly for the more challenging conditions.
Waterstop technology for the 21st Century
Dichtungstechnologie für das 21. Jahrhundert
Tatro, Stephan (author) / Harrison, William (author)
2009
5 Seiten, 7 Bilder, 3 Quellen
Conference paper
English
Damm , Dammbau , Staudamm , Fuge (Bauwesen) , Dehnungsfuge , Spalt , Konstruktion , Wärmeausdehnung , Bauingenieurwesen , Kupfer , Gummi , Asphalt , PVC (Polyvinylchlorid) , Abdichten , Abdichtmasse , Schaden , Reparatur
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