Collins Engineers, Inc. (Collins) was the prime consultant on the Massachusetts Department of Transportation-Highway Division contract for statewide design and review services, which included the full replacement of Bridge No. T-10-007 (08G) carrying Monterey Road over Hop Brook in Tyringham.
Design and review services were performed in accordance with MassDOT’s Project Development & Design Guide, Project Controls, and LRFD Bridge Manual – 2013 Edition. Services included:
- Development of an abbreviated functional design report and a bridge type selection worksheet (BTSW)
- Traffic management
- 25% through 100% highway design submission, bridge sketch plans, bridge submission plans, and PS&E submission which included contract time determination (CTD), special provisions, cost estimate, quantities, and design calculations
- Review of shop drawing submissions and responding to contractor RFIs, in addition to providing support services during construction
Efforts also included coordination with subconsultants and the department for development of a geotechnical report, preliminary right-of-way plans and easements, environmental permitting, hydraulic report, and survey base plans. Collins presented the proposed bridge replacement to local officials and residents as part of a public outreach program, and a load rating report was required on the new structure as part of the project closeout.
Due to its isolated location, the bridge had to remain open during construction. A three-phase stage construction plan was developed using a single lane with alternating one-way traffic over half the bridge width while the other half was closed to traffic during construction.
The new structure, Bridge No. T-10-007 (C3B), is a 52-foot, single span bridge composed of precast prestressed concrete box beams made composite with a cast-in-place reinforced concrete deck slab and bituminous concrete pavement. The superstructure is supported on integral abutments using steel H-piles located behind the partially-demolished original concrete abutments that now help to provide scour protection for the substructure.