Refsheet-Delaware-Memorial-Bridge-mainimg

USA

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.

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A RESTON-SPHERICAL bearing after assembly

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One of the bearings ready for shipping

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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

Key Data

Products:

RESTON SPHERICAL bearings with up-lift control, TENSA POLYFLEX Advanced flexible plug expansion joints

Feature:

Bearings equipped with Structural Health Monitoring System

Installation:

2019

City:

Wilmington, DE

Type:

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