We drilled about 500 mini-piles (aka screw piles) through a subway and then excavated under it. The mini-piles supported the structure during excavation and construction. As excavation proceeded, additional bracing was added to the piles. The load held by the mini-piles has now been transferred to 4 supercolumns and two arched trusses. This area will be the transition from the Transit Hall to the PATH station (a grand entrance from the grand entrance under the MTA subway).
So, time for the mini-piles to go.
While the 5 tracks of our subway station were in operation we built a roof composed of a Vierendeel truss (I do not like Arthur Vierendeel) and ribs composed of 57 individual 250 foot long curved arches. Now that we are removing the falsework you can get a hint of the finished product.
While all of that was proceeding we removed two tracks and are in the process of installing new tracks. A view of the removed 2 track cluttered with construction material.
The new 1 track with concrete ties before the concrete placement. The concrete ties and track are jacked to grade set on center and braced with cross bars.
After the pour we check each running rails alignment and grade.
Special emphasis is taken checking the clothoid spiral entering the platform.
Outside the station, the grand entrance - the Oculus takes shape.
The two levels of plates which will carry the rafters are obvious here.
The rafters will reach 250 feet up and 160 feet out from the top plate.
Multiple levels of Monster steel at one of the abutments
Checking camber on the steel.
The "boss" occupies the third rail in a tunnel under the Hudson river.
Don't try this at home...
Occupying a tunnel plaque station.
These plaques are every twenty feet through the tunnel system on both sides of the track. The tablet tells you all you need to know about the centerline station as measured from the bolt. Round for elevation only, square for horizontal curves and diamonds for vertical curves.
Really awesome!
how do you pour for the track?
How do they get the mud down there?
anyway thanks, you got me to google and wiki Virendeel. Intersting.
Yes, I would think that the load calcs on a Virendeel truss for a structural engineer could get very weighty. (no pun intended)
Scott,
great pictures, gives a good impression of the work you're doing,
thanks to keep us posted.
Is there allready some known date for the project to be really finished?
Chr.
Very nice, Scott.
Thanks for taking the time to share them.
Rick
Fascinating Scott, Thank you for posting.:good:
Thanks Scott for sharing with us, really neat.
There must be a ton of pre layout math to do getting it all into your DC. How do you keep your control and move it around the project to where the work is?
T.W.
Thanks again for posting Scott, I look forward to your posts; they are one of the best thing about this board......and the old one.
The man power involved in a project like this must be huge. I commend a man that can handle that.
I hope you have a great week, I know I will.
Radar
Very interesting, thank you. You can see the experience of the guys in the details. For example, the construction surveyor with a hat full of stickers and a good size cleaning brush attached to its pouch. That's not his first job...
This a very big project. It must be very rewarding to be part of it, congratulations. Call Letterman, he may be interested in having you on the show.
Scott-
Phenomenal how you are able to keep all the pieces in relation !
The upcoming book you are writing (Please ??) will be a must read for all surveyors and engineers.
Cheers
Derek
> The upcoming book you are writing (Please ??) will be a must read for all surveyors and engineers.
:good:
WOW!
Thanks, Scott, for letting us see into your world. It takes a special kind of surveyor to thrive in that environment, as you do.
All I have to say is: You are up, Mr. Moistner.
JA, PLS SoCal