The station box excavation uses two different retaining wall configurations. The east and west walls used steel H-beam caissons lowered into bored holes. The pit was excavated to a depth of 90 feet. The caissons are 120 feet long with holes bored that deep. The bottom 30 feet are filled with concrete to provide a foundation for the caissons. The space between the caissons was filled with wooden timbers known as lagging. The north and south walls used bored holes filled with rebar and/or steel H beams and concrete. The areas where the light rail tunnels will be located used fiberglass rebar as reinforcing.
Moving the hydraulic jacking fixture.
Moving the hydraulic jacking fixture.
Moving the jacking fixture.
Workers cleaning the concrete pumping machine.
The boring rig at work.
Boring the retaining wall holes behind the Neptune theater.
The south end of the site being prepared for retaining wall boring.
Utility relocation underway.
Another view of the underground utility relocation.
A worker is measuring the depth of the trench being dug by the excavator.
A second boring rig at work in front of University Manor.
This is a simpler boring rig; it lacks the device to place steel casings.
A worker is measuring the depth of the hole by dropping a weighted steel tape measure into it.
The auger being lowered into the hole.
A view north up Brooklyn Ave.
A photographic archive of some recent UW construction projects
