Bridge Projects
Project Highlights
NIANTIC RIVER BRIDGE (top photo)
This 1,800 foot long structure completed in 1991 is constructed of twin steel box girders with a concrete deck. The steel boxes are curved to accommodate the horizontal geometry of the highway. The typical span is approximately 160 foot. The center span is a bascule structure constructed of steel girders with a filled steel grate deck. Several retaining walls with a height of up to 25 feet were constructed.
Total Project Cost: $15 Million
Macchi Engineers performed the inspection and evaluation of the existing structure and the design of the replacement of the existing bridge deck and modifications to the existing stone masonry abutments.. Responsibilities also included hydraulic and scour analyses including the design of revetment measures. Installation of temporary traffic controls including a traffic signal was also included. Performed construction administration including review of shop drawings.
Completed: 2007
Total Project Cost: $400,000
The original four-barrel masonry and concrete arched structure was constructed in the 1800s over the Roaring Brook, and later widened in 1928. Over time, the condition of the structure became poor due to the deterioration of the concrete, and the bridge required a complete replacement.
Macchi Engineers designed a new clear span structure to minimize instream disturbance and the impact to fisheries. All utilities were relocated under the sidewalk slabs between the new concrete beams. The new, 95 foot single span, prestressed concrete beam structure includes an arched fascia beam with a cut stone facing. The metal bridge rail is an anodized brown, with the approach rail consisting of weathering steel. The overall affect of the design of the bridge is aesthetically pleasing to the surrounding area. Additionally, an historical plaque, marking the site of the Stocking Gunpowder Mill (1777) was incorporated into the stonework on the parapet.
Completion Date: 1996
Project Cost: $1.5 Million
The original bridge, constructed in 1909, had deteriorated over time and since rehabilitation was not a cost-effective alternative, Macchi engineers designed a new structure for a twin box culvert with a 50 foot span crossing over Wharton Brook.
Macchi Engineers provided the conceptual layout, utility relocation and construction inspection. Topographic surveys, soil borings and hydraulic studies were arranged by Macchi Engineers, including permit applications for preliminary design drawings to the DEP. Macchi Engineers, a liaison between the town and the contractor, also provided complete full-time, on-site construction inspection.
Completion Date: 1992
Project Cost: $300,000
The original reinforced concrete slab bridge was built in 1914 and over time, developed large longitudinal and diagonal cracks and mortar in the masonry abutments is missing, which has caused stones to shift. It was recommended that the entire structure be replaced.
Macchi Engineers designed a replacement bridge consisting of a 10’ X 5’ precast concrete box culvert and cast-in-place wingwalls. The existing structure was utilized to handle flow during the excavation for the proposed box culvert west of the existing bridge and temporary cofferdams were used to isolate flow through the existing structure.
Completion Date: 1996
Project Cost: $200,000
