Inspection manhole cover in ductile iron EN-GJS-500-7 conforming to norm UNI EN 1563:2012
It can be square or circular in shape, with a circular net opening. It has a EPDM gasket placed inside a groove, in order to increase stability and eliminate any rocking or noise. Furthermore, the hinge seating of the cover is obtained through casting. Externally, the outside border is flanged to optimise its hold in the cement and the insertion of the anchoring bolts.
It is round-shaped, hinged to the frame with maximum opening of 110°, 90° is the safety position (automatic locking), there is the possibility to remove the same cover without disassembling the hinge. It presents an elastic closing system provided with an elastic bar built into the cover, which creates an automatic opening/closing system. This can be carried out using building clays. A high stability is guaranteed by the machine-working of the contact surfaces(turning process), by self-centering guides, placed under the cover with double stops. The upper surface is designed to be non-skid to allow the complete flow of water and avoid the creation of ice.
STANDARD EN 124 CLASSIFICATIONS AND PLACES OF EMPLOYMENT
Manhole covers, gullies and gratings can be distinguished into the following classes: A15, B125, C250, D400, E600 ed F900.
Group 4 (Class D 400 minimum): road carriageways (including pedestrian streets), hard shoulders and parking areas for all types of road vehicles.
THE APPROPRIATE LOADING CLASS CHOICE IS UP TO THE WORKS DIRECTOR. IN CASE OK DOUBT (SUCH AS PARTICULARLY INTENSE TRAFFIC OR VERY HIGH LOADS AREA), IT WOULD BE APPROPRIATE TO CHOOSE A SUPERIOR LOADING CLASS