Have Mud, Will Travel
Sliplines and Annular Space Grouting
Low-density cellular concrete, or grout is used to fill the annular space between an older damaged host pipe and a new plastic liner pipe, usually HDPE. The pipes can be for sewer lines, or culverts under roads or railroads. The grout density is usually kept between 40-55 pcf which is lighter than water so that the water-filled liner will not float. It also needs to be extremely flowable to keep injection pressure to a minimum, around 5 psi and travel long distances (800’) or very small spaces (1-2”) and still achieve 100-500 psi. QC is very critical on every load.
Project Gallery
Juneau - Preparing and cleaning host pipe to receive a sliplined liner pipe in Jordan Cr under Juneau Airport.
Juneau - Brian with pipe plug holding out seawater at high tide.
Juneau - Sliplined aluminum 7' dia pipe x 140' long, inside of an 8' host pipe. The bulkhead is in place with injection and drain ports situated for 4 lifts along with center bracing.
AIA - Grouting the 2nd lift keeping pressure below 5 psi.
Adak - Grouting equipment and materials had to be flown in and mixed at site.
Adak - Inserted 2" fill pipes inside of 6" host pipes in 4' sections glued together to extend 100' under 4 fuel tanks. Pipes were bulkheaded and annular space filled.
AIA - Injection pit for 54" x 400' sliplined HDPE pipe under the taxiway.
Juneau-3rd pour of 4 total to fillo the annular space.
Hiland Rd-Pre-grouting for ground stabilization on jack and bore.
Hiland Rd- Injecting cellular grout into a 2 stage sliplined pipe.
