3.7m (12ft) up to 25.6m (84ft)
Single Leaf Arch
For the smaller spans up to 12.8m a single arch element forms a complete arch ring. The thickness of the concrete section along the development is constant.
Twin Leaf Arch
For the larger spans from 14.6m upwards two elements form one arch ring. The thickness of the concrete section is constant except for the crown area. The connection of the two arch elements, the patented crown joint, incorporates a locally thickened section to allow for easy in-situ casting of the monolithic connection (no formwork required).
The standard range of overfill above the arch crown is 0.6m (minimum) to 5.0m (maximum). Some BEBO E-Series arches can handle higher overfill heights. Such non-standard applications are designed on a project-by-project basis by the BEBO technical staff.