Bay Park Annular Space Grouting

The Job

The Bay Park Conveyance Project is using a combination of microtunneling and slip-lining to redirect treated effluent discharge from Western Bay to an existing ocean outfall several miles away.

The Challenge

Approximately 7 miles of the discharge pipe is being sliplined into an existing 72″ riveted iron pipe running underneath the Sunset Highway. Access pits are between 700LF & 3000LF apart, requiring annular space grouting placements ranging from 200CY to 850CY.

Due to maintenance of traffic concerns, all grouting must be performed at night, and there is nowhere to stage materials onsite.

The Solution

Working with the design and construction teams, CJGeo designed a 30lb/cuft, 150psi at 28 day compressive strength cellular grout for the annular space grouting. By using dry batch mixing onsite, CJGeo is able to achieve the compressive strength required, and place the distances required in the very short nightly placement windows.

To address material logistics, each night’s cement consumption is staged locally during the day, and then shuttled in to each placement location during the pours.

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