The Job
This Ohio annular space grouting project is located in Akron. It is part of the Northside Interceptor, being constructed by Granite Construction. The total project budget is about $215 million, to construct 6,660 linear feet of 16.5′ diameter segmental liner tunnel.
While the main tunnel is single pass, there are multiple tie-ins to the structure, some of which are open cut, and another which is a microtunnel. The microtunnel is 530 linear feet of 48″ pipe.
The Challenge
Plans call to grout the annulus between the carrier pipe and microtunnel casing with 600psi at 28 day material. A lean concrete mix to achieve this compressive strength would be significantly heavier than water. This can cause significant headaches managing carrier pipe buoyancy, as the heavier the grout, the greater the uplift during grouting.
The Solution
CJGeo proposed a 55lb/cuft CJFill-Standard mix to meet the compressive strength requirement, while minimizing carrier pipe buoyancy. Because the proposed material is less dense than water, filling the carrier pipe with water during the grouting process keeps the carrier pipe in place.
A CJGeo dry batch cellular grout crew placed 119 cubic yards of 55lb/cuft CJFill-Standard over two hours to fill the annular space in a single lift. Cellular concrete is also referred to as foamed concrete fill.
Speak With An Expert
Facing a similar challenge to this Ohio annular space grouting project? Give us a shout or shoot us a text. Click the state marker for the location of your project for contact info for the appropriate rep.
