Building materials company Cemex has lifted a new 21.6metre bridge over the A30 at its Bramshill Quarry in Hampshire.
The bridge will allow access to Cemex’s reserves of 1.2m tonnes of sand and gravel at the quarry. It’s unusual for a local authority to allow a bridge rather than a tunnel or a roundabout, however the bridge option was the most cost effective e and least disruptive.
“The quarry site covers over 250 hectares and is intersected by the A30. As mineral extraction to the north of the A30 has been completed and re-forestation of the area taken place, we have had to move extraction to the other side of the highway,” said Rob Doody, Cemex’s southern regional director.
“But we still require easy access to our processing plant in the north of the site which grades and washes the sand. The bridge with conveyor is the most cost effective, sustainable and efficient solution.”
The bridge, which weighs 12 tonnes, incorporates a conveyor belt and a walkway required for maintenance. The conveyor will transport 200 tonnes an hour of the sand and gravel 6.6metres above the highway and forms the vital link of the excavation area of the quarry with the processing plant.
The relevant section of the A30 was closed from 8pm and the crane used to lift the bridge into place parked and rigged in the middle of the road. The work scheduled was completed shortly after midnight. Overnight closure was granted on condition that the road could be re-opened at 45 minutes notice in the event that there were problems on the nearby M3 motorway.