AH4C LH
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Althon AH4C LH Headwall Range Up to 300mm Pipework 600mm - 950mm Backwall Height The AH4C Headwall is a two part Pcc Headwall that allows water to discharge at a 45 Deg. angle, the Environment Agency's preferred method when discharging into a watercourse. The AH4C headwall fully meets the Environment Agency’s ‘Standard rules SR2015 No 27 - Constructing an outfall pipe of 300mm diameter through a headwall into a main river’ & Exempt flood risk activities: environmental permits section FRA12 ‘Outfall pipes less than 300mm diameter through a headwall’. The AH4C is available with three different backwall heights and three different toe depths for Twin Wall or Clay Pipes up to & including 300mm ID. Having a separate toe makes it easier to handle and more importantly ensures the foundation around the toe and beneath the Headwall structure can be well compacted.

Althon AH4C RH Headwall Range Up to 300mm Pipework 600mm - 950mm Backwall Height The AH4C Headwall is a two part Pcc Headwall that allows water to discharge at a 45 Deg. angle, the Environment Agency's preferred method when discharging into a watercourse. The AH4C headwall fully meets the Environment Agency’s ‘Standard rules SR2015 No 27 - Constructing an outfall pipe of 300mm diameter through a headwall into a main river’ & Exempt flood risk activities: environmental permits section FRA12 ‘Outfall pipes less than 300mm diameter through a headwall’. The AH4C is available with three...

Back full with as dug material in 150mm compacted layers 50mm sand blinding layer Installation Guidelines Earthworks adjusted locally to match headwall slope Min 200mm well compacted selected, uniformly graded granular fill 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 as the...

AH4C Headwall Lifting Guide M20 LIFTING LOOP M20 CAST-IN LIFTING SOCKET RD20 Threaded Lifting Loop Safe Working Load: 2000kg each Manufactured from zinc plated steel wire rope with a precision bright steel threaded portion. Threaded lifting loops are ideally suited to axial lifting procedures but can be used up to and including angled lifts of 30 degrees. Use and Operation The threaded lifting loop must be fully threaded into the lifting socket prior to commencing a lifting operation. It is imperative that the two mating surfaces are parallel to each other. Althon Precast Concrete AH4C...