Hatem Bridge Substructure Repairs
This challenging $48 million project located on the Susquehanna River featured deep underwater rehabilitation and scour protection to the foundation and substructure of the Thomas J. Hatem Memorial Bridge (US 40) in Harford and Cecil counties. This preservation project consisted of underwater repairs to 10 concrete piers supporting the Hatem Bridge. The work zone will be in the Susquehanna River.
Work sequencing occurs as follows:
- Excavation of the river bottom surrounding the piers to remove stone and debris.
- Install steel cofferdams around the piers. Cofferdams were constructed using steel sheet piles as well as steel sheet pile combi-walls. The combi-wall designs utilized various diameter pipe piles ranging from 38” to 72” driven to bedrock with drilled shaft rock sockets to anchor them into the bedrock.
- Remove material inside the cofferdam to expose existing bridge foundations.
- Pour tremie seal inside the excavated cofferdam.
- Pier repairs included removing and replacing deteriorated concrete, reinforcing steel, repairing cracks, strengthening columns and constructing a protective reinforced concrete encasement around the repaired foundations.
- Removing the cofferdams and restoring the river bottom to its original condition.
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