Solid Top Covers and Frames

Advantages include: 1. Increased flange area in the seating areas. 2. Overall flange area gives a much reduced bearing pressure. 3. Inverted T flange design resulting in reduced stress on mortar. The possibility of crack propagation is much reduced due to a reduced lever arm effect. 4. Various design points reduce the possibility of sideways under breaking and luring traffic. Max Power For high density traffic areas, Clark-Drain a market leader in drainage solutions for the construction and civils engineering markets - has introduced the new High Max heavy duty manhole cover and frame. Manufactured from ductile iron and kitemarked to BS EN 124: 1994 it has a 400kN loading duty and, with the 150mm deep frame, meets the criteria of the Highways Agency Advice Note: HA 104/02 Design Manual for Roads and Bridges. Soon to become available with hinge and integrated locking features. The design of the High Max manhole cover helps to overcome some of the common causes of manhole cover failure. The design of the High Max manhole cover helps to overcome some of the common causes of manhole cover failure. The design provides low bearing pressure which helps to extend bedding life. More central downward forces base flange reduce the stress on the mortar. The inverted T base flange give central loading less chance of overturning movement. There is also a high degree of torsional stiffness for a more stable installation and good resistance to lateral movement. The hinged cover provides for easier access for drain maintenance purpose whilst the integrated locking system provides added security and safety. The High Max manhole cover is available in a number of different versions. Complementary High Max Gully Grates, mortar and manhole cover lifters are also available

High Max EN 124 Loading D400kN