Capabilities
Our civil engineering expertise has contributed to the construction of many of the nation’s major new highways, tunnels, bridges, ports and commuter railroad lines. Even on the most challenging projects, our experienced engineers and expert personnel have worked in conjunction with some of the country’s preeminent engineering professionals to design/construct site-specific solutions.
Cashman developed and executed an innovative solution that allowed for the completion of Boston’s Deer Island Wastewater Treatment Plant effluent outfall tunnel. In what the Boston Globe called “an unprecedented engineering feat,” Cashman positioned a jack-up barge in 120 feet of water to ventilate the 9.25 mile tunnel 950 feet below the water-line with fresh air - allowing construction workers to remove safety plugs from diffusers.
On Boston’s Central Artery Tunnel Project (CA/T), a Cashman-led joint venture adapted deep soil mixing technologies to meet the challenges of the Fort Point Channel, a vital link along the CA/T’s critical path. Cashman/PKA created a block of earth with the density and compressive strength to accommodate the three tunneling methods (cut and cover, tunnel jacking ad immersed tube) used to complete the link between the Mass Pike and the Ted Williams Tunnel, which leads to Logan Airport.
In one of our most notable projects, we constructed 1,800 feet of the Central Artery Tunnel from Chardon Street to the Charles River, where eight lanes (four northbound and four southbound) emerge from below grade at the Fleet Center and under Causeway Street to meet the 10-lane, cable stay bridge that crosses the Charles River. Extensive underpinning of 19 bents was required to support 1,400 feet of the elevated artery while work progressed safely below grade. Major utility relocations, temporary facilities and service connections played important roles in clearing the path for the cut-and-cover tunneling operation.
| Heavy Civil | Marine | Dredging |
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| Demolition | Wind Power | |
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