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Old April 24th, 2015, 11:44 PM   #5661
weidncol
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This will allow the podium crane to do roughly half of the tower steel.

Also, I'm assuming they will be switching from a 1-fall line to 2-fall.
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Old April 24th, 2015, 11:52 PM   #5662
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Quote:
Originally Posted by NYStruct View Post
Boom inserts to lengthen the boom from 135' to 195' on the podium Crane.
The lengthening of the boom is supposed to happen tomorrow.
Oh, awesome. Thanks!
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Old April 25th, 2015, 12:39 AM   #5663
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Quote:
Originally Posted by weidncol View Post
This will allow the podium crane to do roughly half of the tower steel.

Also, I'm assuming they will be switching from a 1-fall line to 2-fall.
To the best of my knowledge, there is no plan to switch to 2-fall as it would only increase the capacity for lifting radius < 80'.

Tandem picks with the Potain will be used to set some of the steel on the North and South sides of the building. I'm not sure if the Potain has enough capacity for the steel erection on the East side, or if that will be done later once the NE crane (Wolff) gets installed.
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Old April 25th, 2015, 01:45 AM   #5664
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Construction for WTC Tower 3 has reached the 15th floorhttps://www.facebook.com/wtcprogress?ref=ts&fref=ts
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Old April 25th, 2015, 03:12 AM   #5665
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Will the concrete "core" of the tower get "thiner" as it rises more? It seems that on the West side the core of cement is "inching" eastward. Will it inch westward on the East side as well?

Maybe they are waiting to have a "thiner" core, and therefore having more space before installing the new cranes? Just an idea...
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Old April 25th, 2015, 03:50 AM   #5666
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No the size of the core does not affect the crane installation.
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Old April 25th, 2015, 06:32 AM   #5667
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Quote:
Originally Posted by NYStruct View Post
To the best of my knowledge, there is no plan to switch to 2-fall as it would only increase the capacity for lifting radius < 80'.

Tandem picks with the Potain will be used to set some of the steel on the North and South sides of the building. I'm not sure if the Potain has enough capacity for the steel erection on the East side, or if that will be done later once the NE crane (Wolff) gets installed.
I didn't know the Potain would be helping with steel at all.

Also, it would make sense to change to a 2-fall as the longer boom slightly decreases max lift capacity, plus that 80' radius increase would still help. The tower steel is a bit more heavy than the podium.
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Old April 25th, 2015, 04:54 PM   #5668
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At what speed/rate does the core grow? How many stories per month? I have heard that they are already at floor 15...
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Old April 26th, 2015, 07:31 PM   #5669
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http://kerrigan.synology.me/earthcam.php?view=memorial
New longer boom now installed. Hopefully we see new steel starting this week?
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Old April 26th, 2015, 07:40 PM   #5670
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Yes, they are installing perimeter columns today.
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Old April 26th, 2015, 08:52 PM   #5671
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Really, they need both cranes just to lift 1 beam? I knew they should've made the Favco have a 2-fall line...

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Old April 26th, 2015, 10:34 PM   #5672
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Wow ! Now the progress is really visible (both core and levels)
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Old April 27th, 2015, 02:26 AM   #5673
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It's really starting to come together... hopefully WTC2 will be joining on a rapid ascent soon!
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Old April 27th, 2015, 05:57 AM   #5674
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Photo provided by kznyc2k @SSP.
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Old April 27th, 2015, 06:11 AM   #5675
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I'm confused as to why they need both cranes as well... It seems that the podium crane had no problem lifting the heavier tower columns near the podium? So why can't it lift these?
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Old April 27th, 2015, 01:22 PM   #5676
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Because they increased the boom length without making the hook a 2-fall, meaning the max lift capacity is less than before.
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Old April 27th, 2015, 07:51 PM   #5677
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Quote:
Originally Posted by weidncol View Post
I didn't know the Potain would be helping with steel at all.

Also, it would make sense to change to a 2-fall as the longer boom slightly decreases max lift capacity, plus that 80' radius increase would still help. The tower steel is a bit more heavy than the podium.
Quote:
Originally Posted by weidncol View Post
Because they increased the boom length without making the hook a 2-fall, meaning the max lift capacity is less than before.

Doesn't really work like that - the only benefit from going with 2 falls would be for picks weighing more than 70,000lbs at short radius - and there isn't any on that building. The columns are the heaviest picks and are around 40,000lbs - 50,000lbs tops.

The capacity of the podium crane is limited by range and stability (overturning moment) - not the strength of the rope or the winch capacity (which does not control for long-range picks). So even with 2 falls, the Favco would not be able to make that pick by itself as it is too far away (it would be different if the crane was installed in the NE corner).
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Old April 27th, 2015, 10:15 PM   #5678
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A Visit to the World Trade Center Showroom (Read more in link)
http://tribecacitizen.com/2015/04/27...nter-showroom/

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The folks at Silverstein Properties invited me to join a tour of the World Trade Center showroom on the 10th floor of 7 World Trade Center. There are exhibits not unlike you’d find at a museum telling the story of the area’s rebuilding—and terrific views of the World Trade Center Transportation Hub and down toward the 9/11 Memorial






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Old April 28th, 2015, 01:20 AM   #5679
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ok question, what's the reasoning behind having the 3rd crane on the NE corner?
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Old April 28th, 2015, 02:02 AM   #5680
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Based on the pictures provided by Vertical_Gotham it can be seen that all podium floors are completed right?
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