Slipform Paving
Slot Drain
Continuous insitu slipformed slot drain provides a new, innovative, positive water drainage system for highways, trunk roads and airport aprons and runways.
The section design maximises water capacity and flow, yet minimises the unit size.
The system is primarily self-cleaning. However access is provided for routine maintenance at nominal 80 linear metre centres via opening covers incorporated within insitu surrounds.
The low installation and maintenance costs provide a positive drainage system with an attractive overall whole life cost.
Slot drain may be formed fully free-standing in advance of adjacent slab construction or scabbed-on against a fully or partially constructed slab. The profiles may incorporate caged reinforcement.
Concrete is placed over a void former providing the drain. The slot is formed insitu by the paving mould.
The void former may either comprise an inflatable tube, which is subsequently removed following the initial set of the concrete or a plastic pipe that remains inside the concrete section. The plastic pipe is cut longitudinally following the initial set of the concrete at the base of the slot to provide access to the drain.
Slipformed Slot Drainage systems are becoming increasingly popular as designers and contractors alike realise the advantages the system offers. Significant quantities have already been constructed within many prestigious schemes including aprons and runways at Heathrow, Stansted, Manchester and Birmingham airports together with sections of major roads including A720 Edinburgh City Bypass, A55 in Anglesey, M25 motorway and A1 trunk road.