Composite bridge design and pile freeze back time test in cold and high-altitude permafrost region.pdf

After sixty years service of Qinghai-Tibet Road, highway joining Golmud and Lhasa was about

to build. The design scheme for bridge constructed in cold and high-altitude environment needed to be

analyzed. Given the complicated geological and ecological conditions plus high seismic-risk, steelconcrete

composite bridge was recommended. An integral concrete-steel composite girder (ICG)

scheme for permafrost region application was proposed, whose highlights mainly included millfabrication,

overall-girder-erection, fast construction, less labour consumed by cast-in-situ. Field test

for pile freeze back in permafrost region was carried out to investigate the solid bond formation time.

Freeze back test was in the backdrop of the construction of Chala Ping Bridge. Pile freeze back field

test could be a practical reference for the small-span bridge construction schedule drafting in

permafrost region.