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No copper infrastructure in UK so why is BT (British Telecum) Openroach in
R. Mark Clayton wrote:
As I understand it the issue is spoil removal. In small holes, you
simply compact the spoil into the side of the tunnel. As long as it's
not rock the subsoil is soft enough to allow that.
For bigger tunnels that is not a viable option and you have to get the
waste material out. For big tunnels ( 1M?) there is enough room for a
proper tunnelling machine with a conveyor to carry away the spoil.
The intermediate sizes where there is insufficient room for a adequate
conveyor system is the issue.
An idea that comes immediately to mind for holes around 25cm diameter is
to crush the spoil to granules and flush it through the hole it is
drilling using water.
That idea took less time to think of than to write.
There must be any number of other extraction & disposal mechanisms that
could be developed by a small team of people with experience in the
Like an air knife or similar https://www.airspade.com/
Already used in suitable locations.
Nice - doesn't damage big roots of trees.
Also there are ferris wheel type cutters that are hauled on the back of
tractors that simply cut a trench.
They use truck size vacuum cleaners with giant tubes
that take all the rubble leaving zero mess.
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