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Old January 17th, 2009, 09:39 PM   #81
twilight_2008
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When are tower cranes going to be erected?
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Old January 17th, 2009, 10:00 PM   #82
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When are tower cranes going to be erected?
probably not until spring/summer, this is a guess question you are asking here
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Old January 25th, 2009, 12:19 AM   #83
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At least one tower crane will be erected in about three weeks.
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Old January 25th, 2009, 01:46 AM   #84
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Hurrah! I'm not going to go on the WTC 1 thread, I havent done for many weeks, Im focusing more on this beauty because progress is 100 times quicker.
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Old January 25th, 2009, 07:00 AM   #85
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When are tower cranes going to be erected?
lowermanhattan.info reports it will be installed Feb 14th.
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Old January 25th, 2009, 08:20 AM   #86
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lowermanhattan.info reports it will be installed Feb 14th.
approximately
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Old January 25th, 2009, 12:27 PM   #87
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Originally Posted by ZZ-II View Post
January 6th from wtc.com:

Massive updates
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Old February 6th, 2009, 07:03 AM   #88
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From lowermanhattan.org,

Feb 5, 2009
4 World Trade Center a Rising Reality

The muddy floor of the east bathtub has become mostly concrete at the site of 4 World Trade Center (WTC). It is a tangible sign of progress, and a long-awaited one for leaseholder Silverstein Properties. The developer has eagerly prepared for this phase of physical construction, spending months planning, finishing design documents, drawing up contracts, and procuring materials.

At the same time, the Port Authority, which owns the WTC, devoted countless man hours over the course of roughly two years to excavate the site down to bedrock -- an effort that allowed Silverstein’s groundwork to begin last winter, even as Port Authority crews continued digging on the site’s western edge.

“It’s a long duration, and there have been challenges,” says Scott Thompson, Silverstein’s project executive for the tower. “There are a lot of uncommon logistical issues, like coordinating our work with the [WTC Transportation Hub] project, and working next to the 1 train box. But we have a great architect and a great design team, and we are building.”

Located at the site’s southeast corner, with the future address 150 Greenwich Street, “T4” was designed by Japanese architect Fumihiko Maki. His minimalist vision for the 64-story tower completes Daniel Libeskind’s master plan, which uses the four WTC towers as an abstract spiral descending towards the National 9/11 Memorial.

At 975 feet, Maki’s is the shortest of the east-side towers, standing out for its sleek, glass façade and two distinctly shaped floor plates. From the base to floor 46, the 44,000-square-foot floors will take the shape of a parallelogram, echoing the shape of the WTC itself. From floors 47 to 63, the 34,000-square-foot floors form a trapezoid. The result is a major setback on the western side, like a single step downward toward the Memorial plaza. (Read more about the design here.)
Work on the tower’s foundations began in earnest in fall 2008, but only after a major pitfall was overcome -- or filled in, rather. This summer, Tishman Construction crews excavated the site’s soft schist to reach 40- to 60-ton bedrock, the sturdiest form of earth at the site, and the only kind that allows such a massive skyscraper to rise.

As test borings were done, geologists began seeing rocks considered unusual for this area, such as red shale, sandstone, and gray basalt. Knowing that Lower Manhattan is home to a glacial valley formed roughly one million years ago, geologists determined that the T4 rocks were deposits from a glacier that advanced from the Palisades an estimated 20,000 years ago.

When its ice began to melt, raging streams of water flowed in front of it. The sand, gravel, and boulders it carried downstream were caught in the currents, bouncing across the bedrock -- essentially sandblasting away the softer layers of rock. As a result, deep potholes and larger basins were carved out to form a “glacial swirl.”

“We thought we had hit a boulder,” says Thompson. “But the more we excavated, the more it was clear this was something very different.”

Construction crews continued to dig deeper, eventually uncovering the full pit the glacier left.

In order to build, the hole was filled with high-grade concrete. The level surface, surrounded by steel-and-concrete footings now being installed, forms the tower’s base slab and foundations at about 80 feet below the street. That base construction also includes the future WTC’s Vehicular Security Center ramp, which curves around the building’s southeast corner.

At the center of the site, the tower’s sub-cores are taking shape, and installation of the first of three tower cranes in mid-February will make construction progress even more obvious -- and faster.

Thompson says that as long as harsh winter weather doesn’t cause more concrete-curing delays, the next few months of building will bring the cores up several levels, creating the sub-grade mechanical floors and lower-level retail concourses that will link to other WTC structures.

Infrastructure, including T4’s fuel cell, electrical, and other utilities, is being built as well. That work includes details like finalizing contracts with the various subcontractors and trades to keep the project moving ahead towards substantial completion in 2012.

By this September, Thompson says the tower base will begin to rise above street level, with the steel superstructure following soon after. His team also is coordinating with the Port Authority’s excavation on the building’s west side, expected to wrap up in late February.

“This job is unique not just because of the site’s history,” Thompson says. “It’s unique in its own right for the level of complexity. Beyond the regular construction, we’re building 36-inch-thick core walls, redundant safety systems, green-building components -- and there’s tremendous coordination through all of it. Most other buildings in New York are simply not like this.”
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Old February 6th, 2009, 07:34 AM   #89
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street level by september he had better live up to that or he want be able to live it down.
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Old February 7th, 2009, 07:31 PM   #90
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posted by NYguy on SSP:





Silverstein’s crews are pouring the Tower 4 (“T4”) slabs and footings.


Steel rebar is prepped for installation.


The tower’s fuel-cell basin is at the lowest point of the foundation


Silverstein’s T4 Project Executive Scott Thompson says the tower’s superstructure will be above street level by September 2009.





Workers place a rebar cage that will form the base of a footing.


Concrete is lowered into the T4 site by crane.


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Old February 7th, 2009, 08:03 PM   #91
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Good pictures. We should be seeing the first tower crane in one week.
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Old February 7th, 2009, 08:12 PM   #92
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As i've seen these are mostly mobile cranes. The BIG mobile crane that was next to the PATH entrance is gone and replaced by a much smaller mobile crane. THe site seems to be swarming with much more activity as well. I'll take more photos next week but post the few i got here & tower 1 thread because they show the whole site.
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Old February 8th, 2009, 12:54 PM   #93
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Nice progress
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Old February 9th, 2009, 11:57 AM   #94
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There will be a fuel-cell in the basement?
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Old February 9th, 2009, 02:46 PM   #95
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There will be a fuel-cell in the basement?
Yes, it's their contribution to reducing their carbon footprint. The hydrogen will be trucked in after being generated at a remote site with electricity produced by windmills. Personally I think the idea of putting fuel cells in the heart of Manhattan is just inviting a terrorist attack.
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Old February 9th, 2009, 10:51 PM   #96
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Yes, it's their contribution to reducing their carbon footprint. The hydrogen will be trucked in after being generated at a remote site with electricity produced by windmills. Personally I think the idea of putting fuel cells in the heart of Manhattan is just inviting a terrorist attack.
is this just a wild-ass guess or do you have some knowledge that fuel cells pose a special hazard?
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Old February 10th, 2009, 12:02 AM   #97
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wow what a close up of the work. Those concrete at the foot of the tower must be dense.
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Old February 10th, 2009, 05:46 AM   #98
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Yes, it's their contribution to reducing their carbon footprint. The hydrogen will be trucked in after being generated at a remote site with electricity produced by windmills. Personally I think the idea of putting fuel cells in the heart of Manhattan is just inviting a terrorist attack.
It's not just a contribution to reduce co2 emissions, it is simply a way to store energy. Just like most other skyscrapers have oil tanks with generators for emergency situations,to keep up emergency systems and vital functions such as fire alarms, lighting and other things. Depending on the storage system and generator used to transform the hydrogen into electricity, it will be less/more/same advantage compared to oil storage. As for chemical instability, it depends on the storage system used to store the hydrogen (and I'm pretty sure the engineers have thought about it enough time, since it is their job). Same problematic can be found with oil (highly flammable as well), therefore it depends on the technology used. If it was riskier than oil, engineers wouldn't have used hydrogen in a multi-billion dollar project for absolutely no reason.
As for the risk in a terroristic attack, it is stupid even to consider: it will be in an underground chamber made out of reinforced concrete as a plus other than the reinforced container that will keep the hydrogen. A risk that is not even worth to discuss in an internet forum for skyscrapers.
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Old February 10th, 2009, 01:22 PM   #99
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Hydrogen is definitely a lot more riskier than oil, but i agree there will be a good fail safe system.
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Old February 10th, 2009, 03:30 PM   #100
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is this just a wild-ass guess or do you have some knowledge that fuel cells pose a special hazard?
Fuel cells are fueled by hydrogen which is extremely hazardous to handle and use. Even in very small concentrations it can explode or burn. In addition it's molecules size is very small so it's very hard to contain leaks at any joints in the system. Detection systems are absolutely required to detect leakage.
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