Inspection manhole cover in ductile iron EN-GJS-500-7 conforming to norm UNI EN 1563:2012
Made by casting, is composed of assembled elements with bolts. The modular structure of the frame allows the assembling of two or more pieces continuously, so that to obtain manhole covers of various lengths. The surfaces in contact with the cover are worked by machine, in order to have a perfect coupling and eliminate the gap between frame and cover. The height of 150 mm ensures stability in use, and the levelling screws ensure a correct installation.
Made by casting, it guarantees stability and absence of noise, due to the working by machine of all the contact surfaces; in addition, the interposition of a grease layer between frame and cover, together with the locking screws, create a watertight system. The surface of the cover is recessed, and presents a depth of the basin equal to 80 mm, so that it can easily be filled with concrete or other materials. The cover is provided with four slots for the insertion of suitable lifting keys.
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 5 (Class E600 minimum): areas subject to high loads, e.g. ports and airports..
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.