Precast reinforced concrete box culvert products are factory-produced reinforced concrete infrastructure elements used at water crossings beneath roads and railways and on site drainage routes to convey surface water and open-channel flows in a controlled manner. In production, moulds, concrete and curing conditions are controlled in the factory environment, resulting in elements that are ready for installation on site.
Box culverts consist of rectangular-section elements in which the bottom and top slabs and the side walls form a single-piece reinforced concrete frame. On site, the elements are laid one after another to form the required line length. Depending on project requirements, single-cell crossings can be arranged, or multi-cell crossings formed by placing units side by side.
The choice between a pipe and a box culvert is made by considering hydraulic capacity, available height, span, sediment transport and maintenance requirements together.
Typical Areas of Use
- Water crossings beneath roads and railways
- Water conveyance in stream beds and at flood crossings
- Flood control and drainage routes
- Agricultural irrigation and water conveyance lines
- Industrial facilities and large-site drainage systems
Key Advantages
- Rectangular section advantage: At crossings where base width and clear span are critical, it offers an efficient solution in terms of layout geometry.
- Precast production: By controlling moulds, concrete and curing conditions in the factory environment, it provides repeatable production quality.
- Rapid installation: Reduces in-situ formwork and lengthy on-site concrete work; elements that are ready for installation on site shorten the installation period.
- Modular configuration: The elements are placed in sequence to form the required culvert length; where necessary, a multi-cell crossing can be formed by placing units side by side.
- Load-bearing capacity suited to project loads: With a reinforced concrete section designed taking into account fill height, pavement loads and hydraulic conditions, the aim is safe use.
- Long service life: The reinforced concrete body and correct detailing are intended to provide long-term use and low maintenance requirements.