Moulds for water drainage systems

Construx Precast offers a comprehensive range of formwork solutions and tilting tables for the precast production of water drainage infrastructure. Whether for slotted drainage channels, culvert headwalls, or junction boxes, our moulds combine adjustability, surface precision, and efficient demoulding to meet the highest industry standards.

Slotted drain moulds - precision-made circular gutters

Construx Precast provides a system of four fixed moulds for producing slotted drainage channels with integrated openings and high surface finish.

Element specifications:

• Length: 4m
• Outer Section: 600mm × 600mm
• Inner Diameter: 300mm

Mould configuration:

• Outer mould: Adjustable steel panels to allow variation in cross-section shapes
• Inner form: Machined steel tube placed between two precision end plates
• Plastic wedges placed between the tube and base plate to create drainage slots

Once the concrete has set, the tube is pulled out using a winch system, enabling fast, damage-free demoulding.

Culvert headwalls – made on tilting tables

For large box culverts, custom-made headwalls are produced using two 13m × 4m tilting tables equipped with:

• Adjustable side forms
• Detachable sides
• Box magnets
• Extensions to cast elements up to 4m wide

Production occurs in two phases to ensure accuracy and handling efficiency.

Standard headwalls for round culverts – modular moulds

Construx Precast offers three modular moulds for standard headwall production, suitable for rectangular and V-shaped profiles, allowing quick, repeatable casting in one single pour.

Adjustable dimensions:

• Width: 1600mm to 2550mm
• Height: 1150mm to 1800mm

These cassette-style moulds accommodate different shapes and features and enable top-down casting, ensuring fair-faced finishes on all sides.

Adjustable junction box moulds

Custom-designed junction box moulds are available with:

• Fully adjustable geometry
• Connection ports on all four sides for easy integration with slotted drains and culverts

Ideal for stormwater networks, infrastructure drainage, and urban utility systems.

Key benefits

• Complete mould system for drainage channels, headwalls, and junction boxes
• High-precision machining ensures fair-faced finishes and dimensional accuracy
• Modular moulds with adjustable inserts for multiple size variations
• Efficient top-down or tilt casting with smooth demoulding
• Custom solutions for infrastructure, roadworks, and utility projects