When I am drilling holes for pipework I use some attachment to the power tool that drills one guide hole in the middle and a big pip-sized disk. The material inside that disk is not ground up to pieces, it comes out of the hole whole.
At the moment boring machines do not work like that, a conveyor belt of small pieces comes out. What if A380 fuselage sized pieces of rock came out instead and were conveyed off to the coast for coastal defence purposes, or even land reclamation? Carrying objects weighing thousands of tonnes to the sea is not simple but the amount of material excavated the hard way - ground to pieces first - would be significantly lower.
Maybe they have a 'coring machine' rather than a 'boring machine'?
It's quite possible they could reduce the cost if they found a way to pipe the excavated rock into surrounding regions of less dense rock, through pipes drilled at intervals along the tunnel. Meaning the excavated rock never needs to go up to the surface, it can just be digested and fed as a slurry into neighbouring areas.
He has said he thinks he can reduce the costs by a factor of ten, but except for having spare parts on hand to reduce downtime I don't think he has been specific about his ideas. He bought a conventional boring machine recently (I don't know if it has been delivered yet) to get more data.
When I am drilling holes for pipework I use some attachment to the power tool that drills one guide hole in the middle and a big pip-sized disk. The material inside that disk is not ground up to pieces, it comes out of the hole whole.
At the moment boring machines do not work like that, a conveyor belt of small pieces comes out. What if A380 fuselage sized pieces of rock came out instead and were conveyed off to the coast for coastal defence purposes, or even land reclamation? Carrying objects weighing thousands of tonnes to the sea is not simple but the amount of material excavated the hard way - ground to pieces first - would be significantly lower.
Maybe they have a 'coring machine' rather than a 'boring machine'?
I think they experimented with these coring designs at some point.
Also, if you accept the assumption that energy will get cheaper in the future, some boring project may become financially feasible.
It's quite possible they could reduce the cost if they found a way to pipe the excavated rock into surrounding regions of less dense rock, through pipes drilled at intervals along the tunnel. Meaning the excavated rock never needs to go up to the surface, it can just be digested and fed as a slurry into neighbouring areas.
He has said he thinks he can reduce the costs by a factor of ten, but except for having spare parts on hand to reduce downtime I don't think he has been specific about his ideas. He bought a conventional boring machine recently (I don't know if it has been delivered yet) to get more data.