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Old April 14th, 2012, 04:44 PM   #901
Swiddle
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I've been wondering about the choice too. Also, they have just switched back to the original boom tip. It's a slightly darker yellow than the other tip that they had switched to when they moved the crane to the slider.
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Old April 14th, 2012, 07:52 PM   #902
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They have finally started removing the temporary supports:

[IMG]http://i43.************/2dt0mxg.png[/IMG]

Also looks like the lower part of that super column has been encased in concrete.
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Old April 15th, 2012, 02:11 AM   #903
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Quote:
Originally Posted by Beber View Post
Can someone explain why they chose a "sliding tower crane" (or whatever its name is) instead of a crawler crane?
For what I've seen in the past the biggest reason is clearance. With a crawler you have to lower the entire boom to extend your reach which could interfere with other structures. With a tower crane like this the majority of the tower stays vertical and just the boom on the top changes its angle to work in different locations which probably gives a lot more flexibility in a cramped location like this.
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Old April 15th, 2012, 10:37 PM   #904
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Quote:
Originally Posted by Msradell View Post
For what I've seen in the past the biggest reason is clearance. With a crawler you have to lower the entire boom to extend your reach which could interfere with other structures. With a tower crane like this the majority of the tower stays vertical and just the boom on the top changes its angle to work in different locations which probably gives a lot more flexibility in a cramped location like this.
You can do the exact functions with a crawler crane. You don't have to just lower the boom to get more radius.

The cost to bring in a crawler crane to the site is alot more then it is to keep the existing Favco 760 tower crane and put it on rails. The reason why the favco is there and a crawler isn't. Plus rent on a 400-600T crane is lots of $$!
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Old April 15th, 2012, 10:44 PM   #905
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Also did anyone notice they are building what looks to be a ramp with DCM's crane mats? Possibly for trucks to back in?
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Old April 16th, 2012, 02:58 AM   #906
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Quote:
Originally Posted by 325ccr View Post
Also did anyone notice they are building what looks to be a ramp with DCM's crane mats? Possibly for trucks to back in?
I have been wondering about this too...
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Old April 16th, 2012, 04:26 PM   #907
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Now they have some decking (concrete?) coming in at an angle from the north. What is that?
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Old April 16th, 2012, 05:27 PM   #908
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Yes I had exactly the same question for the DCM mats. What is going on with that? because they do not extend towards the street side but just seem to be floating there as a platform. Maybe for piling up steel?
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Old April 16th, 2012, 06:47 PM   #909
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I have one question.
What is this on the picture?

what's going on there?

thank you

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Old April 16th, 2012, 07:16 PM   #910
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This most likely is an access ramp for deliveries.

I'm assuming that they (re)changed the boom on the crane just to build that ramp, and when it'll be finished, they'll reswitch it to the smaller version.

When the east side of the Hub will undergo construction, the crane will not have close access to Church St like it has now, so in order to unload big deliveries, truck will have to get close one way or the other, and that's what I'm assuming that ramp is for.

And by getting delivery truck near the middle of the structure, it'll be easier for the crane to move stuff around. If everything was getting delivered from Church St, it would take so much time to move pieces of steel from east to west.
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Old April 16th, 2012, 07:22 PM   #911
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Quote:
Originally Posted by Beber View Post
This most likely is an access ramp for deliveries.

I'm assuming that they (re)changed the boom on the crane just to build that ramp, and when it'll be finished, they'll reswitch it to the smaller version.

When the east side of the Hub will undergo construction, the crane will not have close access to Church St like it has now, so in order to unload big deliveries, truck will have to get close one way or the other, and that's what I'm assuming that ramp is for.

And by getting delivery truck near the middle of the structure, it'll be easier for the crane to move stuff around. If everything was getting delivered from Church St, it would take so much time to move pieces of steel from east to west.

Ok, so ultimately that gets removed? What we are seeing in not part of the structure?
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Old April 16th, 2012, 08:52 PM   #912
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Quote:
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Ok, so ultimately that gets removed? What we are seeing in not part of the structure?
This is definately temporary, to avoid that the sliding crane has to slide back and forth with every piece of steel which is a little bit more on the heavy side..
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Old April 16th, 2012, 08:54 PM   #913
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Correct that the boom was changed for the ramp. The boom right now has a whipline (single line hook). The other boom is the heavy lift boom tip and has 3 parts of line. Changing the boom allows for the hook to move 3x's as quick.
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Old April 16th, 2012, 09:11 PM   #914
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so does this mean they are about to start bringing in some big heavy pieces like the ribs?
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Old April 16th, 2012, 10:13 PM   #915
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A couple of pics from WTC Progress Facebook Page.

Path hub east west connector – fit out.




Path Hub Transit Hall – pouring concrete slab.


Last edited by pnapp1; April 17th, 2012 at 12:01 AM.
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Old April 17th, 2012, 03:45 AM   #916
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Once it gets the shorter boom he will be able to unload more heavy pieces
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Old April 17th, 2012, 08:02 PM   #917
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wow, a whole bunch more columns up on the south side!!

They are flying on this.
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Old April 17th, 2012, 10:41 PM   #918
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It's finally taking shape!
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Old April 17th, 2012, 11:04 PM   #919
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Those are amazing photos, pnapp1. The east-west connector reminds me of the marching hammers from Pink Floyd—The Wall.
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Old April 18th, 2012, 03:03 AM   #920
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Quote:
Originally Posted by Swiddle View Post
Those are amazing photos, pnapp1. The east-west connector reminds me of the marching hammers from Pink Floyd—The Wall.
LOL, It Does!
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