Because of the deteriorating bridge deck and expansion joints on the upper deck of the Richmond/San Rafael Bridge, it was necessary for Caltrans to issue an emergency contract for the repair work. The work consisted of replacing the joint seals on the upper bridge deck using rapid setting concrete. The work was completed in three months.
The Project included construction of a single-lane roundabout at the intersection of Rte 12 and Rte 113. The Project components consisted of approach legs, splitter islands, center island, traversable apron, roadway, intersection widening, drainage system, guard rail replacement, lighting installation, construction staging and site clean-up and restoration. The concrete structures constructed consisted of a round retaining wall, barrier transitions and a structural curb. The retaining wall required colored concrete, aesthetic texture and stain.
The bridge work completed, in general, included widening and rehabilitating two existing bridges over Union Pacific Railroad tracks, constructing road approaches; removing portions of two existing bridges; installing carbon fiber reinforced polymer girder strengthening; installing a structure corrosion protection system; installation of micropiles; bridge bent infill walls, pier wall extensions, bridge widening, bridge footings, catcher blocks, polyester polymer concrete, barrier rails, grading; paving; applying signing and striping and erosion control.
This project provides the installation of ramp metering systems for four on-ramps/connectors along I-680 in Alameda County from 0.3 miles south of Scott Creek Road Undercrossing to 0.3 mile north of Alcosta Boulevard Overcrossing from Post Miles (PM) M0.0 to PM R21.9. The structures consisted of two retaining walls, barrier slabs, gore paving and vegetation control.
The project rehabilitated the existing westbound I-80 bridge over Dan Wilson Creek, which was constructed in 1951 and widened in 1961. The existing concrete bridge deck was approximately 57 feet long, 84 feet wide, and 18 inches thick. The top six to nine inches of the existing lightweight concrete on the 1951 deck structure was rehabilitated with a full strength reinforced concrete deck-to-deck overlay, and the 1961 portion of the bridge deck was rehabilitated by removing four inches of the existing concrete deck and replacing it with reinforced concrete. The existing bridge rails were also replaced. Demolition of the top four to nine inches of the bridge deck and portions of the bridge approach slabs was also required.
No substructure or foundation work was necessary, but the 1961 portion of
the bridge was supported by falsework for temporary support during the deck replacement work.
This project replaced the existing bridge which was built in 1930. The profile of the new bridge raised and widened the roadway. The project required a creek diversion and extension roadway construction along with the new bridge structure. The project was completed in one season.
Hinges 12 and 15 of the connector ramp were upgraded under this project. The work required temporary support (40’ tall +/-), bridge jacking, expansion joint replacement, bridge demolition, concrete crack repair, rapid setting concrete placement and traffic control.
The Project involves both: work to repair and armor the banks along a 222-foot reach of
Pismo Creek where it flows westerly beneath State Route 101 and its appurtenant
bridges; and construction of new piers to fortify an existing bent supporting the
westernmost of the three bridges. The work included extension dewatering operations of the Pismo Creek for access, wet CIDH and rock socket construction, permanent casings, sheet pile walls, bridge columns, falsework, bent cap construction (with self-consolidating concrete) and pre-stressing concrete.
The retrofit includes 3 locations on Rte 152 and Rte 5 near Los Banos, CA. There are 92 column casings, concrete catcher blocks, structure steel, concrete paving, excavation, backfill and bridge bent cap extensions.
Chase Center is an indoor arena in the Mission Bay neighborhood of San Francisco, California. The building is the home venue for the Golden State Warriors of the National Basketball Association (NBA) and occasionally for San Francisco Dons men’s basketball. We constructed over 200 concrete site walls with colored concrete and an architectural finish. The schedule was accelerated in order to meet opening deadlines. Access and coordination challenges were met and overcome for a successful project.
