FAQ

Do FIBERTOP manhole covers have a blocking system?

The EN124:2015 standard establishes a concept of fixing avoid tampering with manhole covers and to make sure that the “suction effect” caused by the passing vehicles does not lift the cover from the frame.

This requirement is established for manhole covers which are placed in road traffic areas, so from class C250 on.

M.M. manhole covers are blocked by screws or by a hinge and have a closing system made of stainless steel.

The type of blocking system depends on the manhole cover model.

The “pull out” test is established by the norm in order to check the blocking system, i. e. applying a vertical force which is proportional to the surface of the manhole cover and check that the shifting of the cover is less than the established limit which is 25 mm.

M.M.’s FRP round manhole cover, class D400, with a 600 mm-diameter stepping area was tested with a vertical force of 1440 and the shifting was equal to zero, demonstrating in this way the safety of the blocking system.