Engineered to perform under pressure, these features maximise rigidity, distribute loads effectively and protect the surrounding road surface from fatigue and failure.
Feature
Description
Beam in beam design
Both covers of the double triangular grating feature universal beams that interlock to provide high rigidity while still allowing the grating to hinge as one unit.
Enlarged frame corners
Enlarged corners spread loads evenly across the foundation, enhancing reliability and lifespan.
Frame gussets
Strengthened corners dissipate loading stresses effectively, providing long-term durability and preventing damage to the frame and cover.
High seating position
Directs forces vertically to convert traffic loads into mortar-compatible compression forces.
Mortar apertures
Frame holes allow mortar to flow through the flange, creating a strong mechanical bond for added stability.
Rounded flange
Smooth, rounded edges reduce stress points and help prevent cracking around the frame.
Textured mortar engagement flange
Texturing above and below the flange improves mortar grip and reduces lateral movement and cracking.
Three-point seating
Non-rocking three-point suspension provides stable seating for silent, reliable operation.
Universal beam
I-beam structure increases rigidity and reduces seat wear for a longer service life.
This advanced structural design, typically featured in D400 and above manhole covers and double triangular gratings, utilises universal beams (I-beams) to maximise rigidity across the cover. Typically used in bridge design, this structure increases strength while reducing weight and allows the covers to function as a highly stable unit under heavy traffic loads, while retaining the capability for safe, opening during necessary maintenance.
Safety and handling
Designed to protect maintenance crews and road users, these features simplify lifting, reduce manual handling risk and prevent accidental movement during operation.
Feature
Description
High skid resistance
Independently tested by a UKAS-accredited laboratory to achieve a PSRV value of 70+ on the chequer surface.
Hinged in three directions
Can be hinged in any one of three directions, provided at the point of order.
Keyway lifting
Integrated keyway frame lifting points provide safe and secure handling.
Lightweight design allows safe installation by a single person, reducing labour costs.
Pedestrian and cycle safe
Smaller openings increase safety for pedestrians and cyclists compared with standard gratings.
Reversible hinge
Allows the grating to hinge in the direction of traffic flow, improving safety during access.
Safety keyways
Safety keyways prevent accidental lifting key disengagement during handling for safer operation.
Safety-stop hinges
Hold covers securely open to prevent accidental closure during access.
Sequential cover opening
Covers open in sequence using standard BS 7903 lifting keys for safe, controlled access.
Slide out cover
Designed with tapered sides and centralised lifting points to allow the cover to slide out of the frame.
Security and access control
Keeping infrastructure protected and secure, these features prevent theft, tampering and unauthorised entry while maintaining safe and reliable access.
Features
Description
Chained cover
The cover is connected to the frame with a chain, reducing the risk of theft.
LPCB lock
Features an LPCB Level 3 lock, offering an unrivalled level of high security.
Spring bar
A low-security spring bar lock provides quick, reliable cover retention.
Turnbuckle locked
Covers are secured with a turnbuckle lock for simple, reliable closure.
Longevity and maintenance efficiency
Built for the long haul, these features reduce lifetime maintenance, improve inspection access and ensure the product performs flawlessly for years to come.
Feature
Description
10-year warranty
Available with a 10-year warranty for lasting confidence and proven performance (subject to terms).
Anti-blockage keyway
GritBlocker comes pre-installed, preventing debris build-up in the keyway, maintaining easy maintenance access.
