Precast box girder is an alternative to in situ box girder when the access to site is restricted.
Bridge deck like
this is suitable for span length from 40m to 150m.
Constant depth
deck is feasible for span lower than 70m, with span-to-depth ratio of 20:1.
For longer span,
haunched profile with span-to-depth ratio of 16:1 at support, and 35:1 at the
mid-span is commonly used.
The width of box
girder usually varies from 6m to 16m.
Other than individual
unit, full length precast box girder deck can also be casted in yard.
This further
hastens the construction process and minimize the site disruption.
The dimension of
full length precast deck usually governed by the capacity of transportation,
lifting and site access.
0 Comments