As the nation's pipeline infrastructure continues to age, more emphasis must be placed on repairing these underground systems. Sliplining and relining are two solutions that allow the installation of new pipe without having to dig a new trench. The existing pipe becomes “the host” for a new carrier pipe which is slipped into place. The annular space between the two pipes is then grouted to protect against shock and corrosion. The result is a “good as new” pipeline installed at substantial savings compared to traditional installation methods.
Whenever annular space grouting is required, the choice of material to be used is critical. Geofill LD is
the product of choice to fill annular spaces, because of its highly flowable characteristic and ability to completely fill the void. In addition, its lightweight nature allows it to be pumped longer distances at lower pressures which decreases the chance of floating or damaging the liner. Geofill LD is also energy absorbent which offers added protection for the liner from ground movement.
Both the density and strength of Geofill LD can be adjusted to meet the specific needs of projects. Certain conditions and project requirements may dictate the use of neat cement or other specialized grouts.
We offer mix design support and production planning to successfully complete your project.
Geofill LD
Annular Space Grouting
Lower Northwest Interceptor Sacramento, CA
This project consisted of a 19-mile sewage conveyance pipeline and pump station system that required micro-tunneling methods to install the new lines anywhere pipe could not be installed in an open-cut trench, such as under the Sacramento River or I-80.
The micro-tunneling operation was completed by filling the annular space around the pipe with Geofill LD cellular concrete to prevent corrosion and movement. This flowable material also reduced potential flotation or collapse of the carrier pipe.
