Nitsch Engineering provided structural engineering services to support the evaluation and inspection of an existing two-span timber bridge crossing on Winnetuxet Road in Plympton. The existing bridge superstructure was replaced in 2002 and the substructure has had some recent repairs, including the placement of concrete to fill large scour holes near both abutments. The latest available bridge rating and inspection report from the Massachusetts Department of Transportation, recommends that the bridge timber pile bent should be replaced or strengthened.
We performed a field inspection, identified structural deteriorations, and prepared a rating calculation of the timber pile bent. Nitsch Engineering used the results and findings of the inspection and rating to evaluate multiple repair and replacement options of the timber pile bent. Preliminary designs, sketches, and cost estimates were combined into a structural report and submitted to the Town of Plympton. In the report, we recommended that two of the four timber piles should be repaired by jacketing the piles and that the concrete cap should be repaired by adding steel plates to the sides of the cap.
The Town reviewed the report and requested that Nitsch Engineering provide structural engineering services to repair the timber piles and concrete cap. Nitsch Engineering is currenty preparing conceptual repair designs, cost estimates, and specifications. After the design phase is complete, Nitsch Engineering will prepare bid documents to advertise the project for construction.