Unite™ D400 manhole covers
Simply the best D400 access cover range available in the market. Packed full of design features that combine to give Unite the longest life and lowest whole life cost of any D400 access cover available. Designed and manufactured to exceed BS EN 124 and Highways England’s Design Manual for Roads and bridges (DMRB) specification CD 534 (formerly HA 104/09).
Over the course of 40 years we have a deep understanding of pavement and highway ironwork performance. Using the very latest tools and software, the Unite range of manhole covers have been engineered for extremely long life.
Key to Unite’s longevity is minimising seat wear between covers and frames. The range has the stiffest cover structure in its class and on top of this, seating which is less vulnerable to any movement caused by cover flexing which may take place.
Unite has been designed to work sympathetically with bedding mortars, reducing stresses on the frame foundation, which has been identified by WRC as a major cause of manhole cover failure.
Internal accessory receiver
Unite incorporates an internal skirt with a sealing face to mate with different specifications of seal plate, depending on the application requirements.
Mortar ‘gripper’ system
Unite’s ‘tread’ feature was developed in response to site observations, which often found mortar had failed to adhere to ironwork. The tread feature and accompanying mortar holes have proven more effective in interlocking with the bedding material than flat underside flange faces of other products.
Large cover seating area
To further increase asset life, resistance to wear has been increased by providing a large interface between covers and frame.
Locking bolt provision
In order to provide controlled access, manhole covers and gully gratings can be supplied with robust factory-fitted screw fasteners. A specifically formed recess is provided for this purpose
Manhole covers - Square