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Delaware Memorial Bridge
Project description
The Delaware Memorial Bridges is a twin suspension bridge crossing the Delaware River. The toll bridges carry Interstate 295 and U.S. Route 40 between Delaware and New Jersey.
It is one of only two crossings of the Delaware River with both U.S. Highway and Interstate Highway designations, the other being the Benjamin Franklin Bridge.
Scope of this project was to replace the existing pin & links, with modern uplift spherical bearings which offer lower friction as well as a robust uplift restraint.
mageba scope
In 2019 mageba supplied sixteen RESTON®SPHERICAL bearings, designed to resist frequent service limit state uplift loads of up to 302 kips (1,344 kN).
All bearings are equipped with modern structural health monitoring system, comprising of embedded pressure sensors, tiltmeter, displacement sensor and proximity sensors, that measure the load, rotation, movement and wear of sliding material respectively. The monitoring system is accessible 24/7 by the owner, through a user friendly web interface.
A full scale production bearing was tested to 150 % proof tension load, as well as
cyclic tension compression loading to simulate the frequent uplift load case.
In November 2020 mageba installed two flexible plug expansion joints to replace some of the aging and damaged strip seal joints on the bridge.
A RESTON-SPHERICAL bearing after assembly
One of the bearings ready for shipping
Installation of the POLYFLEX plug expansion joint on two lanes at a time allowing traffic to remain flowing on the other two lanes of the bridge
Pouring a layer of the flexible plug joint material
The project team is discussing the next steps coming up during the installation of the POLYFLEX plug expansion joint
Installed flexible plug expansion joint on two lanes
En bref
Products: | TENSA®POLYFLEX® Advanced PU flexible plug expansion joints, RESTON® SPHERICAL bearings with up-lift control |
Feature: | Bearings equipped with Structural Health Monitoring System |
Installation: | 2019 |
City: | Wilmington, DE |
Structure: | Suspension bridge |
Span: | 2,150 ft. (655 m) |
Length: | 10,765 ft. (3,281 m) |
Owner: | Delaware River and Bay Authority |
Contractor: | American Bridge Company |
Engineer: | HNTB Corporation |
