Casing Liner Grouting
CASING LINER GROUTING USES CEMENTITIOUS AND FOAM GROUT TO FILL A PIPE CASING ANNULUS.
- CASING LINER GROUTING
- JACKED PIPE CASING
- FILL PIPE CASING ANNULUS
Casing liner grouting is performed within the pipe annulus of a jacked casing and the interior pipe. The grouting inhibits pipe water infiltration and stabilizes the pipe.
Grouts vary from cementitious to various foams. Bulkheads are usually installed with valves at either end. A viscous slurry is pumped from one end through the annulus until exiting the annulus valve at the opposite end.
In runs of several hundred feet, it is necessary to install a grout pipe to the center of the casing where it hangs from stringers attached to the top of the casing. The grout is then pumped through the grout pipe with options consisting of grouting in lifts, stages, form the center outwards, or as the grout pipe is extracted in stages.
Often casing liner installations, either slick lined or jacking, leaves voids in soil, some harmless in nature while others allow casing liner settlement.
Slurry Grouting and Compaction Grouting fill voids and densify soils following soil settlement.