Precast concrete arch elements provide a cost-effective design solution for small bridging and tunnel-like applications. They may bridge across rivers, roads, railways, pedestrian underpasses, stormwater channels or stockpile recovery tunnels. They may support roads, pedestrian overpasses, railways, large fills and material stockpiles. Arch elements can also be used for tunnelling purposes such as for pedestrian subways or desalination plants.
Precast arches are predominantly produced as a single arch unit or as two-piece arch units connected at the crown with either a pin or moment type connection. Arch units are installed on an insitu concrete strip footing and are placed side by side to form the structure width. They can also be purpose built in many segments to suit.
Where large expanses are to be crossed, multiple arch spans placed one after the other can provide an aesthetically pleasing structure. Complete precast concrete arch systems are available and include spandrel walls running parallel to the arch ends and wingwalls to retain the backfill at the ends and sides of the structure.
Superior structural outcome
Off-site manufacture means high quality
High strength, factory produced, long life prestressed concrete offers the ultimate outcome with minimal maintenance
High load capacity
Reduction in formwork and propping
A sustainable solution
Significant sustainability advantages through de-materialisation
Faster construction time
Quick installation by highly skilled crews
Less weather dependent
Simplified and safer construction process
Less trades on site
Less exposure to OHS and industrial relations risks