Stoneham, MA
MWRA, Spot Pond
Scope/Solutions
SGH developed an emergency repair for a 48 in. dia. prestressed concrete cylinder pipeline penetrating the concrete core of the Spot Pond Dam. The pipe was cracked at the penetration point due to ground movement at a nearby bend in the pipeline.
SGH developed emergency repairs to reduce the risk of pipeline burst and stop leakage during a very short window of pipeline down time. We then designed a permanent repair for the pipe going through the dam core. Highlights of our work on this project include the following:
- Inspected the pipe at its interface with the shore face of a wall
- Performed finite element soil-structure interaction analyses of the pipeline, which indicated that the pipe leakage was caused by differential movement of the pipe and thrust block
- Designed external and internal emergency repairs, including immediate installation of circumferential post-tensioning tendons to strengthen the pipe and prevent pipe rupture under pressure along with installation of a continuous inner seal system to stop the leak
- Designed a permanent repair with a specially designed closure piece that would allow pipe movement relative to the wall
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Project Summary
1998
Completion Date
Solutions
Failure Investigation | Repair & Rehabilitation
Services
Structures | Advanced Analysis
Markets
Infrastructure & Transportation
Client(s)
Massachusetts Water Resource Authority
Specialized Capabilities
Repair & Strengthening | Buried Infrastructure
Key team members
Additional Projects
Northeast
Eastern Maine Medical Center Parking Garage
The Eastern Maine Medical Center expansion included a new parking garage to connect to the existing garage and the addition of snow-melt units to facilitate snow removal. SGH was the prime consultant, structural engineer of record, and the precast concrete specialty engineer for the project.
Northeast
Reservoir Place Garage
When the owner observed cracked and spalled concrete throughout the garage, they asked SGH to perform a condition assessment and develop a rehabilitation program to extend the useful life of the structure.