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These units recess the inflow and outflow end of the pipe or culvert into the slope to improve entrance flow conditions, to anchor the pipe and prevent disjointing due to excessive velocities, to control erosion and scour resulting from excessive velocities and turbulences and to prevent adjacent soil from sloughing into the watercourse opening. These units also assist in locating outfall pipes that may otherwise be hidden by vegetation. Althon Headwalls can accommodate pipework with an internal diameter of up to and including 1650mm ID and PCC Box Culverts up to 2400mm wide x 1500mm deep. Multiple pipe outlets can also be accommodated.
Where one of the standard Althon Headwalls isn't suitable due to size of pipe, slope of embankment or skew of wing walls, we can now offer our Culvert Wingwalls. The system comprises of “L” shaped supports that are located on a lattice framework which is set into the concrete base cast on site. Front and side walls up to 150mm thick are secured to the supports by means of angle brackets which are at the rear of the structure and not seen from the front. The front walls can be cast to accommodate single or multiple pipe openings, box culverts and corrugated steel culverts. The Wingwalls can be set at any angle in relation to the Culvert end, and up to a maximum height of 4m, this means that pipe sizes up to 2400mm ID and Pcc Box Culverts up to 3000mm High (Internal) can be accommodated. Wherever water is to be fed from an open watercourse into a pipe outlet, an Althon Silt Trap Inlet should be provided. The sloped grating minimises the risk of blockage from floating material, and silt will be collected by the Silt Chamber prior to the outfall pipe. Althon manufacture a range of Silt Trap Inlets to cater for pipework with an internal diameter of up to and including 1200mm. Althon can offer a comprehensive range of accessories for outlet structures such as Flap Valves, Penstocks etc. These can either be supplied fitted to our Headwalls or separately for fitting to existing or cast insitu units. Our units can also be modified to provide features such as weir walls, baffles, "V" Notch Weirs etc. Modification and Accessory Information Althon Headwalls and Silt Traps have been used on contracts requiring approval from organisations such as the Environment Agency, Local Authorities and the Highways Agency. Althon Headwalls and Silt Traps are quick and simple to install and reduce the need for skilled labour.
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Althon Headwalls offer a cost effective alternative to in-situ structures for connecting Pipework discharging into open watercourses. All drainage pipes discharging into open watercourses, such as Swales, Ditches, Ponds and Rivers, should be fitted with a suitable headwall. 