Innovative Solutions to a Highly Skewed Railway Overhead Built on Compressible Clay

The Roberts Bank Rail Corridor Program comprises a series of road and rail network upgrades designed to improve safety and access to the Roberts Bank Terminal in Delta. A key component is the new Mufford Crescent Interchange in Langley, which will replace an at-grade crossing of the CP Railway connecting Mufford Crescent to Highway 10 with a railway overhead. The site is underlain by deep deposits of soft silt and very sensitive compressible clay which are prone to settlement. The geometry of the interchange is determined by a number of important land use factors which place challenging geometric constraints on the road and bridge design. The bridge is on a short radius curve, and has end skews of up to 70 degrees. A ‘trellis’ beam concept is utilized in order to minimize superstructure depth and approach fill height. The articulation of settlement slabs becomes problematic on highly skewed abutments; therefore two cast-in-place side spans were created to reduce the skews to 30 degrees. Precast deck panels, supported on the precast box stringers, act both as the forms for the deck and as part of the final deck slabstructure, thus eliminating formwork over the operating railway.

Hamersley, B., W. Wu and D. Lawson. 2014. “Innovative Solutions to a Highly Skewed Railway Overhead Built on Compressible Clay,” in 9th International Conference on Short and Medium Span Bridges, Calgary, Alberta, July 15-18.

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