Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

The Ipanema Beach offshore sewage pipeline was installed thirty years ago in water depths up to 31m, in Rio de Janeiro, Brazil. It has a unique design, because steel piles were driven every 41 to 50m at joint along its length, in order to support it, keeping a constant gradient flow. These piles maintain the pipeline above mudline. After only a few years a first of these pile supports collapsed, allowing the pipeline to drop on the seabed, because of the occurrence of micro-cracks triggered by corrosion and environmental loads. Similar failures took place again before corrective measures could be taken. The main challenge faced at the end of 1999 was to solve the problem, thus avoiding any major consequence to the environment in the vicinity of the City of Rio de Janeiro, without having to interrupt the sewage pumping. This challenge was met by designing a non-conventional foundation reinforcement. In December 2001 the final support was reinforced. It is estimated that the entire life of the structure was increased by at least 30 years.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Foundation Reinforcement of the Ipanema Beach Offshore Sewage Pipeline

New York, New York

The Ipanema Beach offshore sewage pipeline was installed thirty years ago in water depths up to 31m, in Rio de Janeiro, Brazil. It has a unique design, because steel piles were driven every 41 to 50m at joint along its length, in order to support it, keeping a constant gradient flow. These piles maintain the pipeline above mudline. After only a few years a first of these pile supports collapsed, allowing the pipeline to drop on the seabed, because of the occurrence of micro-cracks triggered by corrosion and environmental loads. Similar failures took place again before corrective measures could be taken. The main challenge faced at the end of 1999 was to solve the problem, thus avoiding any major consequence to the environment in the vicinity of the City of Rio de Janeiro, without having to interrupt the sewage pumping. This challenge was met by designing a non-conventional foundation reinforcement. In December 2001 the final support was reinforced. It is estimated that the entire life of the structure was increased by at least 30 years.