hlb
RIP
Or, how did they build them in 1600 or whatever. Surely they did not have underwater brick layers.
Hows a harbour wall built
- Thread starter hlb
- Start date
GrowingLad
New member
Wait for the tide to go out and work bleeding quickly /forums/images/graemlins/grin.gif
hlb
RIP
Yes, thats ok for shallow harbours, but what about deap ones.
I presume they had to dig some foundations first, then start on the wall. But how did they do that, ten or twenty metres down.
I've always wondered, just never got around to ask before.
I presume they had to dig some foundations first, then start on the wall. But how did they do that, ten or twenty metres down.
I've always wondered, just never got around to ask before.
nimbusgb
Active member
Temporary earth coffer dams?
jhr
Well-known member
Coffer dams? Or maybe very, very large beavers /forums/images/graemlins/smile.gif.
No Regrets
Active member
Large wooden shutters perhaps?
[2068]
...
Keep dropping blocks over the side, until the blocks stop disappearing?
hlb
RIP
But the walls are all dead straight fro way below low water.
sailorman
Well-known member
Dan Doesnt like talk of Beavers on here /forums/images/graemlins/blush.gif
mjf
Active member
JC water walkers?
DinghyMan
Well-known member
Probably using caisons - http://en.wikipedia.org/wiki/Caisson_(engineering)
Probably the best example of using them; http://www.history.navy.mil/library/online/miracleharbor.htm
Probably the best example of using them; http://www.history.navy.mil/library/online/miracleharbor.htm
mainshiptom
Active member
Just sink a large boat !
DinghyMan
Well-known member
I wonder if there are any ports on the northern french coast that need better harbour walls? There are a few boats lined up at the entrances at the moment just ripe for sinking... /forums/images/graemlins/grin.gif
D
Deleted User YDKXO
Guest
Possibly using timber piles installed with a drop hammer mounted on a floating barge to construct a watertight or near watertight coffer dam and then pumping out the water with a manual or horse driven pump
hlb
RIP
Dont think they could build Mulberys 100 or two years ago.
The pile driving might have worked, but would think it would leak like a sive.
The pile driving might have worked, but would think it would leak like a sive.
DinghyMan
Well-known member
I think variations on the caisson theme have been used for a long time - see http://www.absoluteastronomy.com/topics/Caisson_(Asian_architecture) as they reckon its been used for over 2,000 years below ground and since 984 above ground. They probably didn't use the pressurised ones though and just went with the open top coffer dam style.
Oddly enough I've just finished a book about Dr Haldane who diagnosed what caused the bends that workers got when working in pressurised caissons amongst other things.
Oddly enough I've just finished a book about Dr Haldane who diagnosed what caused the bends that workers got when working in pressurised caissons amongst other things.
BOATKID
New member
sailorman
Well-known member
so they had sheet piles 300 yrs ago /forums/images/graemlins/shocked.gif
DJE
Well-known member
Diving Bells or caissons as others have mentioned.
No Regrets
Active member
In engineering terms, the Pyramids exceed anything we have today, given the bare essentials they had to work with.
Even the bronze archimedes screws used to water the hanging gardens of Babylon were astonishing.
Chucking a wall up in 30ft Water is a piece of p1ss by comparison /forums/images/graemlins/tongue.gif
Even the bronze archimedes screws used to water the hanging gardens of Babylon were astonishing.
Chucking a wall up in 30ft Water is a piece of p1ss by comparison /forums/images/graemlins/tongue.gif
