Heavy Highway and Bridge Construction

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Construction of the I-93 Exit 1 Interchange

Salem, NH

This project was the first of the New Hampshire Department of Transportation’s “Rebuilding I-93” initiative in which a 20 mile stretch of I-93, from the Massachusetts state border to Manchester, NH will be widened for improved safety and mobility. SPS New England was awarded the contract for construction of the Exit 1 ramps and bridges in Salem, NH., involving the replacement of the existing southbound on/off ramp bridges over the I-93 northbound and southbound barrels, as well as the rehabilitation of the ramp bridges over a local collector road. The project included a five (5) phase traffic management plan; reconfiguration of the existing ramp approaches to the bridges; installation of a “Smart Work Zone” real time traffic data collection system which notifies the public via message boards the actual drive times through the construction zone several miles before they reach the job site; 116,000 cubic yards of earth excavation; 222,000 cubic yards of embankment; and 355 square yards of aggregate pier ground improvements. Other project highlights include, jacking of a 48” diameter reinforced concrete pipe underneath two active I-93 ramps, removal of five (5) existing bridges in their entirety, installation of earth support in twelve (12) separate locations; installation of 19,000 square feet of mechanically stabilized earth wall bridge abutments; and a 2,400 linear foot sound wall, consisting of drilled shaft foundations, precast concrete posts, and timber wall panels.

This project also included an extremely aggressive schedule, as defined by the NHDOT, with four (4) separate and distinct contractual interim milestones required to be completed by November 14, 2008, a mere 14 months from the Notice to Proceed (NTP).

For the six (6) month period between June 1st and November 15th, SPS and its subcontractors worked 6 days a week, 2 shifts per day to successfully construct three new bridge structures and opened the new alignment to traffic on time. This achievement was made possible by SPS’s ability to first identify, and then dedicate the resources required to complete the work, including over 40 SPS laborers, carpenters and operators. During this accelerated period, SPS managers would update the project schedule weekly to identify which activities fell on the critical path, and properly allocate the resources necessary to complete the project on time.

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