They can be spaced with a distance between the track lines of max 6 mt.
The structure consists of typical Y-section beams having a visible concrete gully on top for water channelling, thus creating a relevant slope of the wings and a channel of huge capacity (170 lt/min).
The beams usually have a distance between the track lines of 3 / 5 mt and uspport of top of their wings roofing some particular elements (ribbed, corrugated, curved domes made of various materials: fiber-concrete, steel plates with different protective coatings, aluminium-zinc or aluminium.
Beam height: 80 / 90 /100 /110 cm.
Extrados width: 120 cm.
Thickness of the vertical bulb: 8 / 10 cm.
Thickness of the foot: 30 / 35 cm.
Fire resistance: 30-60-90 min.