Drilling Shafts for Bridge Construction

(music) We are actually replacing this old bridge. This bridge was originally built in 1965, and it is outdated. It’s.


(music) We are actually
replacing this old bridge. This bridge was originally built
in 1965, and it is outdated. It’s only two lanes, and we’re getting
ready to build a five-lane structure. This project is unique because it
has drilled shafts under this bridge, and quite large in diameter. They are ten foot in diameter,
and some 100 feet deep, and they provide a wonderful, stable
foundation to build the bridge upon. Normally, you would drive
steel piling down in the ground underneath of your piers. Because of the karst terrain, you have
jagged rocks and an uneven keel underneath the ground, so piling
could glance off of that rock and go in different directions. So, it’s not really feasible. The drilling is the hard part. These shafts go from 80
to 110 feet in the ground. One shaft would probably,
from start to finish, take a month. We’re here where they’re
working, you’ll see the oscillator. It’ll work back and forth, and works
that casing down into the ground. It’s a 10-foot diameter pipe. It has
cutting teeth on the bottom of it. There’s probably 80 feet of that casing
down in the ground that you can’t see right now. That cage actually gets added to and,
you’ll build a column that same size, on up, and then you’ll have a
great big pier up on top of that. You’ll see that old bridge
only has two beams on it. This one will have nine beams on it. You’ve only got five piers. There
will be seven on this new bridge. You don’t have river bridges
being built all the time. We got three and a half miles of roadway
to build as well, so it takes a little bit. And it won’t be over
until the summer of 2021.

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