R18A Rectangular Headwall Range by Althon is a single-piece precast concrete headwall system with separate toe extensions, designed for pipe outfalls up to 600mm in diameter, with a backwall height of 1080mm and options for single or multiple pipe openings, suitable for twin wall, uPVC, clay, or concrete pipes.

  • Precast concrete headwall for pipe outfalls up to 600mm in diameter

  • Single-piece structure with separate toe extensions in 300mm or 500mm thickness

  • Accommodates single or multiple pipe openings, with cast-in openings to suit pipe material and diameter

  • Backwall height of 1080mm, with three toe depths

  • Factory fitting options for gratings, flap valves, penstocks, handrails, baffle blocks, and orifice plates

  • Compliant with Sewers for Adoption guidelines for Section 104 Agreements

  • Wing wall options: 1 in 1, 1 in 2, 1 in 3 slopes, or horizontal at 90 degrees to backwall

Applications

  • Surface water outfalls

  • Drainage and sewerage systems

  • Adoptable sewer schemes

  • Flood management infrastructure

  • Water company projects

Dimensions

  • Backwall height 1080mm

  • Maximum pipe size 600mm (twin wall, uPVC, clay), 525mm (concrete)

  • Toe extension thickness 300mm or 500mm

Materials

Made from precast concrete

Installation

Toe extensions fixed using threaded rod, nuts, washers, and high strength non-shrink grout

Factory fitting available for gratings, flap valves, penstocks, handrails, baffle blocks, orifice plates

Accreditations

Sewers for Adoption compliant for Section 104 Agreements