Deck and approaches of BR 1-680 on SR 141 over US 13
There is significant spalling and delaminating of the existing concrete deck. The deck has full depth spalls and exposed rebar at multiple locations. The existing steel girders have been impacted by over height trucks multiple times per year because of the substandard under clearance. Due to the under clearance, the bridge is classified as Functionally Obsolete.
This project involves the replacement of the existing concrete deck with a pre-cast concrete deck. The sidewalk on the SB side will be removed to allow the sidewalk on the NB side to be widened. Existing vertical clearance will be increased a few inches by jacking the bridge up. The project will be done under a full road closure with detours for vehicles and pedestrians.
Design work has been completed.
The bridge was closed to traffic on October 9th and was planned to be closed for 45 day however due to unforeseen and technical issues, the project will not be completed on schedule. Since construction began in October, the project has encountered a number of issues that will extend the closure of the bridge. During the initial demolition work, asbestos conduit pipe was discovered by the contractor inside both the north and southbound sidewalks that had not been identified in the project plans for appropriate removal and disposal. As a result, the contractor needed to pause demolition so all of the pipe, about 1200 feet total, could be safely removed before continuing demolition. Additionally, technical issues with the project schematics have also impacted the work schedule.
DelDOT is working with its contractor, Mumford & Miller Concrete, Inc., and its design consultant, McCormick Taylor, Inc. to address these issues and keep progressing on the project.
This will be an accelerated project and the contractor will be awarded incentive payments for early completion and disincentive charges for late completion. Lane modifications will be made to eliminate stop conditions at the on-ramps.
Similar construction was recently performed on Bridge 1-717 carrying I-95 Northbound over SR1/SR7. A time lapse video of construction can be found here. (YouTube Video)
(Reviewed and Updated on 11/27/2017)