As part of large water main installation, a 970′ tunnel, ranging from 60 to 78″ in diameter was mined through a small mountain. A 42″ DIP carrier pipe was then installed by the tunneling contractor.
The annular space needed to be filled with grout to ensure long term stability of the carrier pipe, and of the surrounding ground in an area where the tunnel was hand mined through soil with rib and lagging.
CJGeo proposed and installed 25lb/cuft cellular grout for the annular space grouting. By generating material onsite directly from bulk cement, using a dry batch plant, the 425CY annular space was filled in fewer than five hours.