In 2012 and 2013, the Oregon Department of Transportation had brought in a contractor who lowered the tunnel floor, repaired the tunnel liner
and rebuilt four half-viaducts that carry Highway 58 into the tunnel.
Progress on stations excavation is up to 80%; on precast work for viaducts and tunnel liner
is 20%; for viaduct pier construction 5%; and progress on tunnelling works is 75%.
A linear-elastic constitutive model was assigned for the tunnel liner
Technical Forum: Buckling of Steel Tunnel Liner
under External Pressure, Journal of Energy Engineering 124(3): 55-89.
had come up with a hybrid method--a tunnel boring machine and tunnel liner
A plastic polyethylene tunnel liner
, supposed to be impermeable, has torn in many places, leading to numerous leaks.
is expensive and has a high friction factor.
This year, the contractor expects to place the remaining foundation piles for the viaducts leading to the tunnel, build the viaducts using precast beams and decks, repair and seal the tunnel liner
, repair the tunnel lighting and build variable message signs and a weather station.
Before a single pipe section of the rigid-wall composite steel and concrete tunnel liner
was installed, Ameron worked closely with the Metropolitan Water District's engineers and conducted more than eight months of critical testing and analysis, which included:
4 million state Department of Transportation project at the tunnel includes replacing the viaducts or platforms that hold up the roadway leading into both ends of the tunnel, repairing the tunnel liner
and lowering the tunnel floor.
Of all the options, using tunnel liner
plate necessitated the smallest work pit; and
IT - Invitation to Bid (ITB):Metro Tunnel Liner