Access covers for tunnel installation

"Tunnel covers" are designed to meet the specific criteria prescribed for installation inside tunnels such as: easy installation/exchange/operation and conforming to the fire protection regulations. They come in stainless steel or hot-galvanized mild steel filled with concrete.

• Cable duct cover for installation in tunnel berms and footwalks
• In conformity with DIN EN/124, class B 125, static computation as per DIN 1072, dimensioned as per DIN 1055 (passable by passenger cars)
• Optionally: class D 400, static computation as per DIN 1072/SLW60 (passable by trucks)
• Dimensions as per customers requirements
• Frame and cover made of stainless steel mat. grade 1.4571 (AiSi 316) and conforming to (German) ZTV-ING, part 5
• Cover with concrete surface of nonskid class "R12"
• Single or double leaf cover units with overhead seal - w/o cross beam
• Surface-watertight
• With locking devices NW VK 17 (width across bolt head flats 17 mm), with plastic caps and chambered key holes
• Optionally: with Telekom lifting chambers or threaded lifting holes
• Complete cover system designed to meet fire protection class F 90 (90min. tightness against egress of smoke and resistance to open fire from above and from below)
• Successfully tested as per DIN 1363 by "MPA" Dresden (an independent material test institute)
• Guaranteed protection of cable cords E 90 (RABT 2006 point 7.3.4)
• Cover raisable by 60 mm
• With perma-elastic encircling sealing strip as protection against top concrete
• All stainless steel elements pickled and passivated
• Verifiable static computation