avance en voladizos sucesivos progressive cantilever (construction) method

Creator:	Nikki Graham
Language pair:	Spanish西班牙语译成English英语
Discipline:	-
Definition / notes:	Progressive Cantilever: Progressive placement is similar to the span-by-span method. In progressive placement the precast segments are placed from one end of the structure to the other in successive cantilevers on the same side of the various piers rather than by balanced cantilever on each side of pier. Because of the lenght of cantilever (one span) in relation to construction depth, a movable temporary stay arrangement must be used to limit the cantilever stresses during construction to a reasonable level. Following are economical span ranges for various types of segmental construction. For overlapping ranges, the site constraints will dictate the use of the segmental construction technique. Construction Method Superstructure Depth (ft) Economical Span Range (ft) Span-by-span Precast Constant 6 up to 110 Precast Constant 6 to 8 110- 150 Precast/ Cast-in-place Constant 7 to 12 120- 160 Incremental Launch Cast-in-place Constant 8 to 12 up to 240 Progressive Cantilever Precast Constant 8 to 10 up to 200 Balanced Cantilever Precast Constant 6 to 12 160 - 260 Precast Variable 6 to 20 200 - 450* Cast-in-place Variable 6 to 40 260 - 750 Cable Stay Precast or Cast-in-place by cantilever erection Constant 6 to 15 500-1500
URL:	http://www.fhwa.dot.gov/bridge/segmental/task60.htm