Box Culvert Formwork

Precast box culverts put drainage, cables and services into one buried box — and the box geometry has to repeat precisely for segment after segment to joint up underground.

Zhongbian builds box culvert moulds as outer frame plus adjustable inner core systems: cell dimensions follow the drawing, cores collapse and reset quickly, and joint faces are machined for watertight matching.

Single and multi-cell configurations are available, with external vibration provisions and lifting points cast into the design. Trial assembly and measurement precede every dispatch.

Box culvert moulds are used for precast utility tunnels, road and railway culverts, cable ducts and pedestrian underpasses, where identical segments are cast in battery lines and installed underground.

Utility tunnels and drainage. Prefabricated utility tunnels, storm drainage, service ducts and cable routes are assembled from identical units, so internal dimensions must be the same from the first cast to the last.

Underpasses and crossings. Pedestrian underpasses, farm crossings and small road bridges are cast as box units and placed in one lift, which requires a mould matched to the lifting scheme.