Dellboy wrote:Would an underground range be an easier answer ?
I have been thinking along the lines of a 200 metre pipe sunk into the ground or made in situ around 10 feet deep at its highest point .
Planning permission is vague regarding under land development
10 metres wide 5 metres tall ,plenty of natural noise suppression no better backstop
just a thought
That's 10,000 cubic metres of earth to dispose of not to mention the amount you would have to shift to sink it 10 feet down. I hope that you are good on the shovel or know a couple of mates who are. :lol:
Earth, loam, dry, excavated - 1.25 tonne/cubic meter
Earth, moist, excavated - 1.44 tonne/cubic meter
Earth, wet, excavated - 1.60 tonne/cubic meter
Earth, dense - 2.00 tonne/cubic meter
Earth, soft loose mud - 1.73 tonne/cubic meter
Earth, packed - 1.52 tonne/cubic meter
Tube ranges are not exactly rare and as you say from a safety and noise suppression point of view are very good but they are not exactly cheap to construct. I believe that an underground range of 200 metres or so in length is planned or currently being built at Stirling lines but that will cost us the tax payer millions of pounds.
3 foot diameter tubes are much more feasible for most of us but box sections of roughly 2.5mm section that they use to build pedestrian underpasses could be a consideration. I have no idea on the costings though.