Underwater magic

Article Abstract:

The US Army Corps of Engineers (COE) has developed an innovative system to effectively install durable geomembrane systems underwater. The installation of geomembranes can help control leakage from structures such as dams, tunnels, canals, and reservoirs. The former method of installing geomemebrane system is by dewatering structures because installation can only be performed in the dry which is expensive and sometimes impossible. Geomembrane system is proven to help structures from deterioration. Thus, installation of geomembrane system underwater offers permanent rehabilitation which can be economical.

Installation, Dams, Reservoirs, Reservoirs (Water), Water leakage, Canals, Geomembranes

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Seepage stoppers

Article Abstract:

The rehabilitation project initiated in 1993 successfully corrected the leakage and infiltration problems through the Detroit-Windsor vehicular tunnel with a two-phase investigative and grouting program. The first phase discovered two seepage mechanisms, one common to the sunken-tube subaqueous section of the tunnel, and the other common to the shield-driven approaches to the tunnel. A testing program identified less than five infiltration sources. Phase II undertook remediation of the sunken tube and the shield-driven sections to prevent infiltration.

Seepage, Seepage (Hydrology)

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Tunnel takes cathodic protection

Article Abstract:

The discovery of spalling within the lower roadway of the Brooklyn-Battery Tunnel (BBT) required a repair method that would ensure long-term structural safety and minimum traffic disruption. Cathodic protection was determined as the most cost-effective option in arresting the corrosion of the steel embedded in chloride-contaminated concrete. The method of tracking the corrosion and the different rehabilitation options considered against the objectives of the repair program are discussed. A performance assessment is also provided.

Evaluation, Public works, New York, New York, Cathodic protection

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