• Optimal dynamic stability: The tripod support system of the triangular covers eliminates the risk of rocking and the resulting road noise when commercial vehicles pass.
• Security against vandalism: The presence of a security lock on the first cover, combined with the forced sequential closing of the other three, prevents unauthorized access to the network infrastructure.
• Operator protection during inspection: The integrated hinges are equipped with an automatic 90° locking system that prevents accidental closing of the covers during maintenance activities in the manhole.
• Definitive structural anchoring: The continuous slotted external flange allows the concrete to flow and grip firmly to the frame structure, reducing settlement of the surrounding road surface.
• Compliance with Telecom specifications: Compliance with specification 1480/2015 ensures immediate acceptance of the product during testing of civil works for national telephone networks.

This cast iron manhole cover finds its natural application in road telecommunication infrastructures, positioned over inspection chambers and junction nodes for optical fiber or copper lines. It is specifically designed for installation on fast-flowing roads, main urban arteries, highways and parking areas for heavy vehicles, where static and dynamic loads require a D400 resistance class. Standard compliance makes it the mandatory choice in primary urbanization sites and ultra-broadband network laying.

Choosing the h638_15 model is correct when the project requires a road inspection component that meets the strict approval standards of the main telephone operators. It represents the ideal investment for companies that want to avoid disputes during the testing phase and are looking for a product with maximum durability (157 kg of structural cast iron). It is the technical solution to be preferred if the primary need is to combine a wide clear opening (120x60 cm), suitable for the easy passage of technicians and equipment, with a system of fractional and assisted opening that lightens physical effort compared to traditional heavy one-piece covers.

What is meant by sequential closing of the 4 triangular covers?

It means that the covers are structured to fit together in a precise order. The keyed lock is present only on the first element: once the latter is tightened, its geometry mechanically locks the remaining three covers, simplifying the operations of securing the manhole.

What is the advantage of the 90° locking of the hinges during road operations?

The 90° lock is a life-saving device for operators. When the cover is lifted, it stops stably in a vertical position, preventing gusts of wind, ground vibrations, or accidental impacts from causing it to fall suddenly onto the technician’s passage area.

Does the D400 load class allow for the installation of the manhole cover in cargo loading areas or port docks?

The D400 class is certified to withstand a load of 400 kN (approx. 40 tons) and is suitable for all normal carriageable roads, including hard shoulders. For areas with exceptional concentrated loads, such as port docks or airport runways, it is instead necessary to opt for higher classes E600 or F900.