Vehicle underpasses can be manufactured in either Helibore pipe
(up to 3.6m span/diameter), or bolted plate (up to 12m span/diameter).
The common profiles are either underpass, pipe or arch.
A sealant gasket or gunned mastic is incorporated in the plate overlaps
of the bolted plate systems to ensure a high degree of watertightness.
The invert is normally paved with either blacktop or concrete to provide
an even walking surface. The inside surface can be painted with anti
graffiti paint.
Corrugated steel crash barriers are usually mounted internally along
the
sides and at the mouth of the structure to protect against collision damage.
