BRIDGE CONSTRUCTION PRACTICES USING INCREMENTAL LAUNCHING

BRIDGE CONSTRUCTION PRACTICES USING INCREMENTAL LAUNCHING - Printable Version

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BRIDGE CONSTRUCTION PRACTICES USING INCREMENTAL LAUNCHING - mowafi3m - 02-21-2011

SUMMARY
Bridge construction over deep valleys, water crossings with steep slopes or environmentally protected regions offer many challenges to owners, designers and contractors. The incremental launching method (ILM) for bridge construction may offer advantages over conventional construction, including creating minimal disturbance to surroundings, providing a more concentrated work area for superstructure assembly, and possibly increased worker safety given the improved erection environment. The ILM involves assembly of the bridge superstructure on one side of an obstacle to be crossed, and then movement (or launching) of the superstructure longitudinally into its final position.
Despite potential advantages for certain situations, usage of the ILM for bridge construction has been very limited in the United States. In recognition of this fact, the AASHTO Highway Subcommittee on Bridge and Structures commissioned a study to investigate potential reasons for the lack of application of this construction method. The work summarized in this paper presents the results of this investigation including applications, limitations and benefits of this innovative construction method.

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