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[Ars]Elon Musk’s Boring Company is digging a 10-mile tunnel in Maryland - Page 3

post #21 of 65
Quote:
Originally Posted by epic1337 View Post

i see, but what about the opposite? would pile-driving new foundations on top of the tunnels potentially damage them?

There are plenty of tall buildings with foundations built on top, or around the vicinity of subway systems around the world. Assuming this tunnel is supported by steel or reinforced concrete, and tunneled through limestone, it would take a sizeable earthquake or explosion to damage the tunnel.
    
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post #22 of 65
Quote:
Originally Posted by chaosblade02 View Post

There are plenty of tall buildings with foundations built on top, or around the vicinity of subway systems around the world. Assuming this tunnel is supported by steel or reinforced concrete, and tunneled through limestone, it would take a sizeable earthquake or explosion to damage the tunnel.

its not exactly the same though, its like trying to hammer in a nail through an object, no matter how strong that object is the nail can still deal some damage or even penetrate it.
deep foundations are like that, they're pile-driven straight down and can even penetrate hard bedrocks to act as a strong footing, simply put they're very long nails to keep a tall building from toppling over.

i've already got a fair answer though, the way they seem to do it is to entirely evade pile-driving right on top of those tunnels, they simply form a thick slab to act as a mat foundation, and pile-drive around it instead.
pile-driving is still required in this case, since its relied on to resist lateral loads from toppling the building, and in the case of a tunnel running beneath it the stress can affect the tunnel if the piles are too shallow.
Edited by epic1337 - 10/21/17 at 9:29am
post #23 of 65
I liked it better when the plan was to build the hyperloops above existing road/railways. Maybe not as efficient for the distance but should have been less hurdles, expense, and time to build.
post #24 of 65
Quote:
Originally Posted by epic1337 View Post

well it isn't so easy it seems, theres hardly anything with relations to subways.

the closest thing i found is this image, which is self-explanatory.



in other words, they're probably required to design their buildings to build "around" the tunnels.

I imagine it will be deeper than that.
Edited by Mand12 - 10/21/17 at 11:29am
post #25 of 65
Quote:
Originally Posted by Mand12 View Post

Quote:
Originally Posted by epic1337 View Post

well it isn't so easy it seems, theres hardly anything with relations to subways.

the closest thing i found is this image, which is self-explanatory.



in other words, they're probably required to design their buildings to build "around" the tunnels.

I imagine it will be deeper than that.


My thought as well.
     
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post #26 of 65
Also remember he thinks SpaceX's new BFR rocket will be cheap enough to do site to site transport on earth. I don't think you're going to be building rocket launch sites in the middle of cities, so something like these tunnels to get to the launch sites from populated areas would be perfect.
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post #27 of 65
Quote:
Originally Posted by Crazy9000 View Post

Also remember he thinks SpaceX's new BFR rocket will be cheap enough to do site to site transport on earth. I don't think you're going to be building rocket launch sites in the middle of cities, so something like these tunnels to get to the launch sites from populated areas would be perfect.
Sure, waste future generation's resources while you pollute their drinking water with these tunnels then destroy the ozone with a ton of rockets. Sounds great.
How much energy is ok just to move a couple people quickly? A small town's yearly consumption? How about a medium town or small city? The amount of effort to build and maintain vacuum tunnels just for travel is preposterous. A vacuum pump to pull vac on a 2 semi trailer sized chemical reactor uses 9 kw power. https://www.buschvacuum.com/us/en/products/cobra+industry/cobra+nc/cobra+nc+0600+c If we use less it is inadequate. How many thousands will have to keep going 24/7? They probably have some custom large scale thing that is more efficient but it would still be in the mw of power for hardly any people to use it and that doesn't even count the crazy building costs. Just to travel in a tube. Go to Noah's Ark for crying out loud. And then rocket travel. Why don't we just blast mountains and forests for fun while we are at it.
I'm far from an environmentalist but I do care about waste. There is only so much we can do and we have better things to do with our money and communal efforts than this.
post #28 of 65
Quote:
Originally Posted by rluker5 View Post


Sure, waste future generation's resources while you pollute their drinking water with these tunnels then destroy the ozone with a ton of rockets. Sounds great.
How much energy is ok just to move a couple people quickly? A small town's yearly consumption? How about a medium town or small city? The amount of effort to build and maintain vacuum tunnels just for travel is preposterous. A vacuum pump to pull vac on a 2 semi trailer sized chemical reactor uses 9 kw power. https://www.buschvacuum.com/us/en/products/cobra+industry/cobra+nc/cobra+nc+0600+c If we use less it is inadequate. How many thousands will have to keep going 24/7? They probably have some custom large scale thing that is more efficient but it would still be in the mw of power for hardly any people to use it and that doesn't even count the crazy building costs. Just to travel in a tube. Go to Noah's Ark for crying out loud. And then rocket travel. Why don't we just blast mountains and forests for fun while we are at it.
I'm far from an environmentalist but I do care about waste. There is only so much we can do and we have better things to do with our money and communal efforts than this.

I don't know where to start with this.

   
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post #29 of 65
Power consumption is literally not a problem if we move to renewable resources. Solar is entirely free beyond maintenance once purchased and installed.

Rocket fuel is a bit less renewable, but I’m more upset by wasting crude oil by the tanker on disposable plastic nonsense than on the occasional rocket launch. Even then I don’t think hydrocarbons are typical. Nitrogen compounds and liquid oxygen/hydrogen are pretty good for that.
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post #30 of 65
Quote:
Originally Posted by andrews2547 View Post

Quote:
Originally Posted by rluker5 View Post

Sure, waste future generation's resources while you pollute their drinking water with these tunnels then destroy the ozone with a ton of rockets. Sounds great.

How much energy is ok just to move a couple people quickly? A small town's yearly consumption? How about a medium town or small city? The amount of effort to build and maintain vacuum tunnels just for travel is preposterous. A vacuum pump to pull vac on a 2 semi trailer sized chemical reactor uses 9 kw power. https://www.buschvacuum.com/us/en/products/cobra+industry/cobra+nc/cobra+nc+0600+c If we use less it is inadequate. How many thousands will have to keep going 24/7? They probably have some custom large scale thing that is more efficient but it would still be in the mw of power for hardly any people to use it and that doesn't even count the crazy building costs. Just to travel in a tube. Go to Noah's Ark for crying out loud. And then rocket travel. Why don't we just blast mountains and forests for fun while we are at it.

I'm far from an environmentalist but I do care about waste. There is only so much we can do and we have better things to do with our money and communal efforts than this.
I don't know where to start with this.

No kidding. It seemed like he was telling us to go get a horse.
     
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