Translation glossary: Civil Engineering and Building

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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

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Translation glossary: Civil Engineering and Building

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