Answer if you are a genius.Try it out
Long bridges are constructed as different spans .Why?
Answers
Selection of the most appropriate erection method is consequently a key issue for the engineer during the design stage and subsequently should be agreed with the contractor during implementation.
This paper reviews the construction methods on a number of recently completed long span bridges, including Stonecutters Bridge in Hong Kong, where a span of 1 018 m has been erected using advanced erection techniques while subject to potentially severe typhoon wind loading. The method of deck erection needs to remain structurally robust, while practicality and safety are also fundamental factors in determining how best to erect the bridge deck.
Options are also considered for construction of the substructure, where maximising the use of precast concrete elements can lead to considerable savings in both programme and cost. In a marine environment, casting pier bases in a dry dock not only ensures an improved level of quality, it also drives cost effectiveness and enhances safe working practices.
When developing a scheme for a proposed bridge, whether it is a long span or a shorter bridge, devising a workable method of erection is an essential part of the design process.
For shorter span bridges the form of the bridge dictates a common form of practice that has regularly been adopted for similar bridges in the past. For long span bridges, each bridge will require a unique approach.
All bridges have individual challenges, whether it is the geotechnical conditions dictating the foundation type, or the environmental conditions leading to a specific form of deck construction.
Foundations