Construction of a new concrete utility vault along East 48th Avenue created a significant temporary-support challenge. The vault intersected an existing sewer main that needed to remain operational through most of the construction process.
Before excavation began, the project team needed a dependable way to support the sewer main, maintain its elevation and preserve clear access for installation of the vault and its permanent reinforcing system.
Project Challenge
The new vault would encase the existing sewer main. To complete the work, crews needed to suspend the line temporarily while they excavated, installed reinforcing and constructed the concrete vault around it.
The installation sequence played a critical role in the project. Crews needed to establish the temporary support system before excavation exposed the active sewer main. After exposing the line, the project team had to keep it supported and level while workers completed construction beneath and around it.
The project also required a fully removable system so crews could backfill the completed vault without leaving temporary foundation components in place.
MAGNUM Geo Solutions’ Role
MAGNUM Geo Solutions provided engineering for the complete temporary support structure and developed the recommended sequence for pile installation, excavation, sewer support, vault construction and removal of the temporary system.
This coordinated approach addressed the structural requirements of supporting an active sewer main while allowing construction to proceed beneath and around it.
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