Road Bridges

Blackwater Viaduct, Fermoy Bypass, Ireland

Design of a 450m long viaduct, under a PPP contract. Two parallel externally prestressed concrete box girder decks with spans ranging from 51m to 58m launched over intermediate temporary steel towers and prestressed from end to end after launching, using an innovative prestress system and 450m long cables.

Broadmeadow Estuary Bridge, Dublin, Ireland

Alternative design of a 315m long, twin deck bridge with spans ranging from 52m to 69m constructed using an innovative incremental launching method employing intermediate temporary towers and externally prestressed from end to end after launching.  The number of prestress cables was reduced from 660 to 24 (photo to the right).

Sungai Dinding Bridges, Malaysia

Design for the contractor of 3 river bridges – total length 2.2km, including a landmark, multi-arch bridge. The two other bridges were built using incrementally launched decks, the longest being 600m long – the first incrementally launched bridges in Malaysia. 

Guangzhou–Shenzhen-Zhuhai Superhighway, China

Detailed design of a 17km dual carriageway viaduct over the Pearl River Delta, including 3 major river crossings with spans up to 70m and 3 interchanges. Designed for very rapid construction and constructed in 22 months. 

Ecclefechan Railway Bridge, A74(M), Scotland

Alternative detailed design for the contractor of a 190m long, two-pin, precast reinforced concrete arch with a clear span of 21m and a rise of 8m to clear the overhead electrification. The arch was constructed in two halves and stitched together at the crown. The design and method of construction were then patented.

M74 Maryville to Fullarton Road, Scotland

Alternative detailed designs for three bridges, including a 140m long, 17m span precast reinforced concrete arch, which required 114 precast half-span units that were placed in a total of 56 hours during railway possessions. The contract included the design of a 60m long, 4-span reinforced concrete flat slab bridge with integral abutments - believed to be the first in the modern era of this size and type in the UK,

River Dee Viaduct, A483, Newbridge By-Pass

Post-tender alternative design of a 5-span, 350m long prestressed concrete bridge built using in-situ, balanced cantilever construction. At 60m above the River Dee, it is thought to be the highest road bridge over a river in the UK.