Doyleston Cattle Underpass

Johnston Civil have completed a number of these in the last three years, some more challenging than others and requiring differing levels of construction. A particularly interesting project was for Tony and Jolanda Ackeman of Doyleston. The Ackemans approached Johnston Civil to design an overpass to keep their valuable Ayrshire dairy herd safe while crossing the busy Drain Road during peak times.

The scope included raising the road height by two metres and diverting the drain on both sides, as well as installing two culverts and adding a cattle crossing over a stream. A Traffic Management Plan was drawn up and submiitted to Selwyn District Council (SDC). This allowed the road to be closed in order to complete the main works.

Installing ducting under the road allowed Johnston Civil to get power from the main line to the nearest power pole on the property.

A new vehicle entranceway runs adjacent to a cattle crossing. The crossing leads cows to a new underpass.

Subsequent beam test results showed compaction to be of a very high standard, exceeding the existing road construction.

Johnston Civil were able to help the client reduce costs by helping him use his own resources where practicable. Johnston Civil installed two chambers designed to contain any liquids draining from the underpass, allowing the farmer to pump them out when required. Drains on both sides of the road were shaped to reduce slope severity, increasing driver safety.