Canning wins a further contract for CEMEX at Bramshill Quarry.

Following a successful project at neighbouring Eversley Quarry, Canning Conveyor is to supply equipment for the CEMEX sand and gravel operation at Bramshill Quarry in Hampshire.

Canning have received an order to design, manufacture and supply a new 35 tonne dump hopper/feeder which will accept up to 35 tonnes of sand and gravel from reversing dump trucks.

Fitted with flare plates to decrease the possibility of spillage the hopper will be fully fabricated from 6mm thick mild steel plate suitably stiffened with RSA/PFC sections. All internal sloping surfaces will be fully lined with 10mm low friction white perplas. Inlet dimensions of the hopper are 4 metres wide x 3 metres deep, with the hopper fitted with a hinged sloping product grid to accept the material whilst rejecting any oversize. The hopper outlet will feed onto a short 5 metre troughed belt feeder which will be designed to discharge onto the loading point of a new field conveyor (also by Canning) at the rate of up to 200 tph. This feeder will be driven by a 15 kW drive unit and will feature close pitched rubber covered impact idlers, multiblade scraper at discharge, vee-type return belt plough and emergency stop pull wire system all around.

Both the hopper and feeder will be mounted onto a braced and stiffened supporting structure which will be fitted on one side with heavy duty reinforced plates to accept the load of the oversize coming off the product grid.

The new 160 metre long troughed belt conveyor on installation will elevate as a standard field conveyor at surface level, up graded ground before elevating above the surface as an open ‘dog house' type lattice gantry structure . The conveyor will then run horizontally inside a totally enclosed gantry bridge over the A30. At the north side of the road the conveyor will again be of open ‘dog house' type lattice gantry structure approx 60m long, in 12m long sections. This section of the conveyor will be elevated above ground on lattice trestles from the totally enclosed bridge to clear the existing quarry bund and will then slope down towards the quarry floor where the head end discharge section of this gantry will cantilever to discharge on to an existing radial stockpile.

The tail end impact area of this conveyor will be fitted with close pitched heavy duty rubber covered impact idlers, skirt plates and a return belt plough. A Westweigh belt weigher will be fitted to this section of the conveyor complete with recorder and continuous indicator.

The elevated gantry sections will be fitted with 750mm wide walkways both sides of the galvanised open mesh on the ‘dog house' sections and will consist of fully sealed durbar plate over the bridge. The bridge will be sealed at both ends and fitted with lockable accessible doors. A three-sided platform will be fitted at the discharge with all walkways being accessed from the ground at the south side and via a stair at the north side. A gravity take up system will also be fitted locally to one of the support trestles within the quarry.

The drive/discharge will be fitted with a 630mm diameter, ceramic lagged, 37kw Canning SuperDrive^TM motorized drum, primary and secondary belt scrapers and a discharge chute including a crash box to direct all material including the scrapings onto the existing radial stockpiler.

The installation of the conveyor bridge will entail closing the A30 overnight whilst the structure is lifted by crane into its final position. Local diversions will be in place for a maximum of 12 hours.

Installation is scheduled for April - May 2010 when the equipment will be tested and commissioned by Canning engineers.

Author JVMS Ltd