Klohn Crippen Berger was retained to provide the conceptual and detailed design for the replacement of four bridges on Vancouver Island: the Robertson and Little Fork Bridges on the Pacific Marine Circle Route, the Horne Lake Bridge on the Horne Lake Caves Road, and the Wally Creek Bridge on Highway 4.
The new Robertson River #2 and Little Fork Bridges replace existing bridges which had come to the end of their service life, partly due to damage from scour. After a geotechnical investigation and hydrotechnical assessment, it was determined the new structures would be longer than the originals to increase the hydraulic openings to accommodate the design flows. The abutments were founded on piles protected by riprap to further reduce the risk of damage to the structures. PL-2 rated timber railings were incorporated into the design in keeping with the Ministry’s “use-of-timber” initiative.
The Horne Lake Bridge is a 2-lane, single-span bridge, which replaces a single lane Acrow bridge which was in poor condition. The new bridge was constructed in 2 stages in order to maintain traffic flow during construction. A 2-stage construction approach avoided extensive tree clearing and a costly detour bridge while still maintaining traffic flow for local residents.
Wally Creek Bridge replaces a timber stringer/crib bridge. The road was realigned to improve road safety and the bridge was replaced with a single span concrete box girder bridge founded on rock-socketed piles to eliminate the concern of future scour.
- Project management
- Structural engineering
- Geotechnical engineering
- Hydraulic assessment
- Construction services