PHILADELPHIA | FMC Tower @ Cira Centre South | 736 FT | 49 FLOORS

[RWSMADCONC]

Originally Posted by Philly Fan

What will that be, about 50-60 truckloads? Or will they be using higher capacity trucks?

Started at 4 AM....Standard load is 10 CY per truck in PA (max load on the highway). Ran about 8 trucks an hour, one pump running pretty much non-stop, last clean-up load of 4 CY went in at 10:30.
Ambient was about 26 at 4, 35 at 10 AM, Concrete temps were about 45 deg F at delivery, as it sets up and starts to hydrate it will get much warmer. The middle of the concrete in the mat was 64 deg F at 12:30, will be read again at 4 or 5. This is what the engineer classified as a "mass pour" so he is very concerned about maximum temperature in the center, the difference between the center and at the sides and top, and how fast it cools down. The whole deal is being covered with insulation for the night to keep it warm.

The balance of the mat should be ready to pour just before or after Thanksgiving........there is a lot of reinforcing to set.

Any questions? Beuller? Beuller?

[RWSMADCONC]

Originally Posted by summersm343

When should we expect to see a tower crane installed? I assume just one crane correct?

Three cranes will be used. The first will be north-center inside the footprint next to the mat, should go up in December or January---the second one will be supported off steel framing just outside the footprint above the Walnut Street upper roadway, maybe set in February. Third crane will be in Northwest corner next to the parking structure--again, outside the main footprint---maybe February. Center crane will be to build the core to level 27, the other two will be for the steel frame. Once the frame hits 28 the center crane will take the northeast crane down, and the Walnut Street crane will take the center crane down. The remaining floors above 28 (all concrete) will be built using the Walnut Street crane. All three will be "luffing" jib tower cranes, two Manitowoc MR605B and one TG15000 or something equally as powerful. Luffers are used so they do not crash into each other when weathervaning.

[Philly Fan]

Originally Posted by RWSMADCONC

Started at 4 AM....Standard load is 10 CY per truck in PA (max load on the highway). Ran about 8 trucks an hour, one pump running pretty much non-stop, last clean-up load of 4 CY went in at 10:30.
Ambient was about 26 at 4, 35 at 10 AM, Concrete temps were about 45 deg F at delivery, as it sets up and starts to hydrate it will get much warmer. The middle of the concrete in the mat was 64 deg F at 12:30, will be read again at 4 or 5. This is what the engineer classified as a "mass pour" so he is very concerned about maximum temperature in the center, the difference between the center and at the sides and top, and how fast it cools down. The whole deal is being covered with insulation for the night to keep it warm.

The balance of the mat should be ready to pour just before or after Thanksgiving........there is a lot of reinforcing to set.

Any questions? Beuller? Beuller?

Yeah, not the greatest day for a massive concrete pour in terms of temperature. Thanks for all the details! I'll pass them on to Ferris when he's back in school.

[summersm343]

Originally Posted by RWSMADCONC

Three cranes will be used. The first will be north-center inside the footprint next to the mat, should go up in December or January---the second one will be supported off steel framing just outside the footprint above the Walnut Street upper roadway, maybe set in February. Third crane will be in Northwest corner next to the parking structure--again, outside the main footprint---maybe February. Center crane will be to build the core to level 27, the other two will be for the steel frame. Once the frame hits 28 the center crane will take the northeast crane down, and the Walnut Street crane will take the center crane down. The remaining floors above 28 (all concrete) will be built using the Walnut Street crane. All three will be "luffing" jib tower cranes, two Manitowoc MR605B and one TG15000 or something equally as powerful. Luffers are used so they do not crash into each other when weathervaning.

Awesome!! Thanks for all of the info!

[Philly Fan]

Originally Posted by RWSMADCONC

Three cranes will be used. The first will be north-center inside the footprint next to the mat, should go up in December or January---the second one will be supported off steel framing just outside the footprint above the Walnut Street upper roadway, maybe set in February. Third crane will be in Northwest corner next to the parking structure--again, outside the main footprint---maybe February. Center crane will be to build the core to level 27, the other two will be for the steel frame. Once the frame hits 28 the center crane will take the northeast crane down, and the Walnut Street crane will take the center crane down. The remaining floors above 28 (all concrete) will be built using the Walnut Street crane. All three will be "luffing" jib tower cranes, two Manitowoc MR605B and one TG15000 or something equally as powerful. Luffers are used so they do not crash into each other when weathervaning.

JEEEZ! Can we get someone here who actually know's what he's talking about, instead of all this BS guesswork?

[shakman]

Originally Posted by RWSMADCONC

...
Luffers are used so they do not crash into each other when weathervaning.

If the mast are of different heights and properly spaced-out, then the jibs would not crash into one another. Is it possible the swing radius is tight due to surrounding environment, hence why the luffers are being used? As well swing radius restrictions?

[shadowbat2]

Originally Posted by RWSMADCONC

the second one will be supported off steel framing just outside the footprint above the Walnut Street upper roadway,

Will it be bracketed/cantilevered like the one crane off the side here?
Freedom Tower by dylan-just2, on Flickr

[Plokoon11]

No pictures of the pour today?

[1487]

Originally Posted by Plokoon11

No pictures of the pour today?

too cold outside to take pics!

[Philly Fan]

Originally Posted by 1487

too cold outside to take pics!

But not too cold to pour almost 1,000 tons of concrete???

To quote our beloved former mayor and governor: Wimps!

[Plokoon11]

Hey If I lived and commute in Philly I would be taking pictures in a hurricane but unfortunately I'm only in Philly a few times a year.

[nateberry1]

Originally Posted by Plokoon11

No pictures of the pour today?

Here is one I got walking by. I can post a few more larger ones later if interested.

[Plokoon11]

Show them all! Thanks for the shot on this harsh cold day!

[Philly Fan]

Originally Posted by nateberry1

I can post a few more larger ones later if interested.

Definitely!

[nateberry1]

As requested, here are a few larger ones of the site post pour.

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[Philly Fan]

Thanks, Nate! GREAT photos!

Just like being there, but a helluva lot warmer!

[Philly-Drew]

Originally Posted by RWSMADCONC

Started at 4 AM....Standard load is 10 CY per truck in PA (max load on the highway). Ran about 8 trucks an hour, one pump running pretty much non-stop, last clean-up load of 4 CY went in at 10:30.
Ambient was about 26 at 4, 35 at 10 AM, Concrete temps were about 45 deg F at delivery, as it sets up and starts to hydrate it will get much warmer. The middle of the concrete in the mat was 64 deg F at 12:30, will be read again at 4 or 5. This is what the engineer classified as a "mass pour" so he is very concerned about maximum temperature in the center, the difference between the center and at the sides and top, and how fast it cools down. The whole deal is being covered with insulation for the night to keep it warm.

The balance of the mat should be ready to pour just before or after Thanksgiving........there is a lot of reinforcing to set.

Any questions? Beuller? Beuller?

Thanks for the details!!

[kraggman]

Great update nateberry1 !! That is one busy site.

[summersm343]

Awesome updates Nate!

[summersm343]

11/24/2014