SFA6 Headwall Range Up to 500mm Pipework 750mm - 1470mm Backwall Height 300 and 500mm Thick Toe Althon Sewers for Adoption precast headwalls should be used when a concrete headwall is part of a Section 104 Agreement and the sewers are to be adopted once completed by the local Water Company. The materials used and installation must comply with the ‘Sewers for Adoption’ guidelines. Althon SFA precast concrete headwalls offer a cost effective alternative to in-situ structures for connecting pipework discharging into open watercourses. There are five sizes of Sewers for Adoption concrete headwalls available catering for pipe sizes up to and including 1500mm. Each size of SFA precast concrete headwall comes with three depths of toe and four back wall heights offering wing wall profiles to suit most applications. Althon Sewers for Adoption precast concrete headwalls are cast to suit the diameter and type of pipe being used and can be provided with fixings cast in at the time of manufacture to accommodate gratings, trash screens, flap valves, penstocks, ladders, Kee Klamp® handrails and flow and depth monitoring equipment. Our Sewers for Adoption compliant precast headwalls are available with toe extensions either 300 or 500mm thick with depths ranging from 450 to 1000mm. We also manufacture Sewers for Adoption compliant outfall safety grilles to suit our concrete headwalls. Optional Kee Klamp handrail Maximum pipe size 500mm Specifiable pipe invert levels Single or multiple pipe openings Optional pre-fitted grating Optional pre-fitted flap valve Optional pre-fitted penstock

Althon SFA6 Headwall Range Up to 500mm Pipework 750mm - 1470mm Backwall Height 300mm Thick Toe

Back fill with as dug material in 150mm compacted layers Installation Guidelines Earthworks adjusted locally to match headwall slope 50mm sand binding layer Min 150mm well compacted selected, uniformly graded granular fill Geotextile Ensure that first or last spigot/butt or socket/butt pipe that is to be fitted to the Headwall is in position and free from backfill. Dig out the bank of the watercourse to take the size of the headwall making sure that the Headwall will not protrude into the path of the water flow. The angle of the excavation to the rear of the Headwall should be roughly the same...

Rapid-Lift Lifting Anchors All Althon SFA Headwalls and Toes are fitted with Rapid-Lift lifting anchors. The Althon Rapid-Lift system allows the SFA Headwalls & Toes to be offloaded, transported and located in their final position without the need for any specialised lifting equipment. lifting hooks and chains can be used with the three lifting points (two lifting points on Toes). The minimum chain leg length for all units is 1500mm. Althon Precast Concrete SFA Headwall Safety Sheet Althon Limited manufacture pre-cast concrete SFA Headwalls using :6 - 14mm aggregate . 0/4mm Sharp sand . Portland...