doi:10.3850/978-981-08-7920-4_S1-C22-cd
Construction of the Chelsea Street Vertical Lift Drawbridge Utilizing Modern Construction Techniques
John M. Pecora III1, Franklin M. Grynkewicz1 and Jerry M. Pfuntner2
1Framingham, MA, USA.
2Finley Engineering Group, Tallahassee, FL, USA.
ABSTRACT
The Chelsea Street Drawbridge is an existing single leaf bascule bridge which connects the cities
of Boston and Chelsea, Massachusetts over the Chelsea Creek. The existing structure is being
replaced with a vertical lift drawbridge due to the hazard to marine navigation posed by the
existing structure as well as structural deficiencies. Through the use of modern construction
techniques, the replacement of the movable bridge structure was executed while minimizing
the impacts to the community. The installation of the liftspan truss was engineered as a preassembled
bridge span constructed on land adjacent to the existing bridge. The upper tower
sections of the bridge were also pre-assembled on the project and erected as single two-hundred
ton column elements. Computer aided structural analysis was performed to review of the
stresses induced on the liftspan truss due to the liftspan launch methods. Geotechnical analysis
was also performed for loads induced by cranes and truss launch. The geotechnical engineering
was also performed using computer modeling software. The innovations implemented through
the use of modern construction methods and equipment during the construction of the Chelsea
Street Drawbridge allowed the project construction team to reduce the risks to personnel while
meeting project requirements.
Keywords: Vertical lift drawbridge, Bridge construction, Geotechnical, Bridge launch.
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