Continued from page 15 new bridge that was constructed.


 Coordinating street closures and traffic flow with the Golden One Center, which was concurrently under construction just a few block away from this jobsite.


 Managing project access and pedestrian and vehicle traffic flow through the project site during several special planned public events, including the California Amgen bike tour.


 Accommodating multiple levels of falsework and ensuring access to the parking garage.


Foundation drilling was particularly


challenging due to the small, congested area the contractor had available to build the 2nd


Street bridge in the “boat”


section of Sacramento, which is set below river level. In order to place the drill rig to drill the 85-ft.-deep foundations, crews had to carefully remove five sections of a five-foot-thick concrete seal slab that not only forms the roadway for Neasham Circle but also acts as a plug to prevent water from coming up out of the ground. “Te drill rig itself was taller than the building that it was next to, and it was going down 85 feet,” Carr said. “Tis was probably the best year we could have done this due to the drought, which helped lower the water table and minimize any dewatering that we had to do.”


Multi-Tiered Falsework Another challenge was tied to


the falsework that was required for constructing the 2nd


Street connector


bridge, which hangs out over I-5. Te falsework design and construction required multiple tiers, with part of it sitting up 14 ft. higher than other portions that sat lower on I-5. “We had falsework pads sitting on I-5 and falsework pads up above on Neasham circle as well,” Carr said. “It was pretty tight down on I-5 to be able to construct the falsework and make sure we had clearance.”


www.AGC-CA.org Associated General Contractors of California 15 Installing all the


reinforcing steel in the bridge bent caps was another key challenge in the field. “It was very, very tight to get everything in there, with maybe an eighth- inch clearance,” he said. “We worked with our rebar subcon- tractor to come up with a quick solution to make it work, using 2x4s that were the same width as the rebar. We modeled the rebar layout to ensure our solution would physically fit in there. It was pretty tight little bridge (374-lineal ft. long) to get all the rebar in, but they did a great job.”


Protecting Historic Buildings Te proximity of several histori-


cally significant buildings to the jobsite proved to be another challenge. During foundation construction, the team performed seismic and structural monitoring of all buildings within 100 feet of the work area to ensure they stayed below a strict vibration


threshold. “Tat was successful, and there were no repairs required on any of the buildings,” Dion noted. Ultimately Myers & Sons


completed the job on schedule, within budget and safely, with no lost time accidents recorded. “We had a good working relationship with the owner and the CM team, and we were able to work through any issues and deal with them as or before they came up,” Carr concluded. “Everyone was happy with the end product, and it is a big win for the residents and visitors to Sacra- mento.” 


Photo by Auburn Photography


Photo courtesy Myers & Sons Construction LP


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