Precast drains are cheaper and easier to install
Method of construction is determined by location, size, cost and performance requirements. Trench drains can be constructed by either:[/vc_column_text][/vc_column][/vc_row][vc_row column_spacing=”60″ css=”.vc_custom_1743480645968{margin-top: 0px !important;padding-top: 0px !important;}”][vc_column width=”1/2″][vc_column_text]
Cast-in-situ
Formwork used to create trench in surrounding concrete
- Used only in concrete pavements
- Costly, complex formwork to construct on site
- Care required to ensure frames and grates are fully supported by surrounding concrete – good vibration essential during concrete pour
- Difficulties in achieving level grate seating
- Hydraulic performance poor due to rough internal finish. Trenches susceptible to biological growth
- Difficulties creating a hydraulically efficient ‘U’ or ‘V’ shape bottom (cast in-situ usually has square base design with poor hydraulic characteristics)
- Difficulties in achieving sloped system – formwork becomes even more complex adding to installation time and labour
- Quality of finish can vary greatly, depending on contractor
Precast modular systems
Off-the-shelf factory produced channel units that connect together to create trench drain
- Some products can be used in a variety of pavement types
- Neat aesthetic appearance
- Quick to install
- Hydraulically efficient due to smooth surface and curved profile bottom
- Easier to secure grates
- Consistent quality due to factory controlled production of channels
- Cost effective when labour and material costs taken into account
- Easier to estimate costs
- Less maintenance required
