EISENHOWER & JOHNSON TUNNELS

ACC was hired to remove and replace pavement in the Eisenhower and Johnson Tunnels. The tunnels are at an elevation of 11,000 feet. The work was accomplished over a three-week period by shifting traffic into the eastbound or westbound tunnel that was not being worked on. Every weekend the traffic had to be returned to both tunnels. The removal and repaving work also corrected the finish grades inside of both structures. Other work included lining 2,000 lineal feet of water line inside of the tunnels and placing 24,000 lineal feet of cable barrier guardrails on the approach to the tunnels.

SAN FANCISCO BAY BRIDGE SEISMIC RETROFIT PROJECT

This project involved marine work in the San Francisco Bay utilizing a fleet including: two tugs, two crane barges, two material barges, two crew boats and two personnel crafts. All of the Bay Bridge Tower Anchorages at Piers W2, W3, W5, and W6 between San Francisco and Yerba Buena Island were retrofitted with new concrete and steel anchorages, pre-stressed reinforced concrete jackets, diaphragm walls and steel tower base reinforcements. In addition, 120-foot long cable tie down anchors were installed at Pier 2 through the existing tower foundation and into the bedrock below. At the Pier W4 Center anchorage for the two suspension spans, a two-foot thick by 90 foot tall continuous reinforced concrete jacket was installed at the base of the anchorage to strengthen the tower base. The anchorage for the Bridge Suspension Cable at Yerba Buena was strengthened with a heavy steel framed bent structure installed inside the existing cable anchorage vault.

VAIL FRONT DOOR PROJECT

The Vail Front Door involved mass excavation and structure backfill in downtown Vail, CO to create a new parking garage, 13 chalets and other miscellaneous buildings. To complete the Vail Front Door there was 200,000 cubic yards of structure excavation and export, excavation for 50 foot high permanent shoring walls, drill and blasting next to existing buildings, backfill and grading work, utility work and temporary and permanent dewatering.

CALTRANS SEISMIC DESIGN PROJECT

CalTrans Seismic Design Engineers openly acknowledge that the most challenging portion of the San Francisco Bay Bridge retrofit effort was Toll Bridge Retrofit Project 16. For over eight years, after the Loma Prieta earthquake, the state designers worked to develop a retrofit design that would allow the target span to move up to 18 inches east and west during an earthquake event. The resulting design required the retrofit of the supports for the west end continuous truss span. The project included Bent A and Bent B on Main Street in downtown San Francisco, installation of dynamic isolation bearings, reconstruction of Pier W1 and installation of a new pump station to service all of the potable water needs for Yerba Buena Island. The major feature of the project involved jacking the bridge at Bent A and subsequently at Bent B without stopping traffic, shortening the existing column supports and installation of dynamic isolation bearings. The jacking load was 3,300,000 pounds…the largest ever done by ACC.

TARRYALL ROAD PROJECT

To reconstruct the eight and a half mile roadway in Pike National Forest, Park County, CO, a variety of complex needs had to be met. The reconstruction required the development of 51-culvert crossings, the creation of six structural plate boxes, the excavation of 98,000 cubic yards of roadway and 50,000 tons of base coarse, and the application of 22,000 Tons of Superpave Asphalt Concrete Pavement.

DIAMOND PROFILE GRINDING

The Diamond Profile Grinding is a Concrete Pavement Restoration (CPR) technique that corrects a variety of surface imperfections on concrete pavements and should be used in conjunction with other CPR techniques, including full-depth repair and dowel bar retrofit. Diamond grinding involves the removal of a thin layer of the concrete surface using diamond saw blades. The level surface is achieved by running an assembly of closely spaced blades across the pavement surface. This produces saw cut grooves; the uncut surface between the saw cuts breaks off more or less at a constant level leaving a smooth surface (at a macroscopic level). The result is significant improvement in pavement ride-quality and skid-resistant characteristics. The longitudinal texture produced has been shown to be highly effective in reducing accidents in problem areas.

DOWEL BAR RETROFIT

Dowel Bar Retrofit is a process where undoweled-faulted pavements are retrofitted with dowels on transverse control joints. This process restores the load transfer between the pavement panels. After installation and diamond grinding, the ride quality is greatly improved and noise levels are decreased substantially.

Additional CPR technical data, specifications are available at www.igga.net

ORVIS SHOREFOX DEVELOPMENT PROJECT

The construction of Orvis Shorefox Development along the Colorado River in Granby, CO required 2.3 million yards of earthmoving, development of an 18-hole golf course, creation of over six miles of new road construction, overlot grading, creation of eight major lake or ponds for fly casting and fishing, construction of a new bridge over the Colorado River and the development of diversion structures and erosion control.