Tower Cranes Marriott HQ

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Two tower cranes are erected over a weekend for the new Marriott Headquarters building in Bethesda, Maryland.
This video shows the erection of the mast of the south tower crane on Saturday morning, and the erection of the jib of the north tower crane on Sunday morning.
Produced by John Z Wetmore, producer of "Perils For Pedestrians".

[@joenewman6939]

My hat goes out to you guys great job crane operator persition my friend

[@David-cv1vh]

Great

[@alistairmacrae4870]

Not wishing to be a spoil sport, the guys with the hammers, if one of these hammers were to drop? The crane driver is something to behold.

[@flick22601]

I've seen thousands of these cranes in my life but, this is the first time I've seen how they're erected. How large is the concrete base and how long must it cure before they assemble the crane? Thanks for posting.

[@JohnZWetmore]

I don't know the exact dimensions, but it is a pretty massive slab several feet thick. There is a photo in this blog post that shows the four mounting points for the north tower protruding from the middle of the slab. (Click on the photo for a larger version.) pedestrianadvocate.blogspot.com/2019/08/construction-in-bethesda-tower-cranes.html

[@JohnZWetmore]

On another site they were pouring the foundation today (Wednesday) for a tower crane that will be erected Saturday. So they only needed a few days for the concrete to cure, even though it might take a bit longer to reach full strength.

[@user-oc8pf2hf4z]

ก่อสร้างไรครับ

[@miguelainaga7658]

Todos mis respetos para esas personas,yo jamas me subiria a esas alturas

[@bertferri-5685]

Huge respect to these riggers. I get vertigo on a step stool reaching for the cereal box on the top shelf!😊

[@Ifantoys]

Sungguh sangat luarbiasa...,dan saya merasa hormat kepada para pekerjanya yang sangat pandai sekali,salam dari Indonesia 🇮🇩🇮🇩🙏🙏

[@gerardochacon1743]

Kiero montar una torre grua autoestable de espamex j 47 ns

[@AM-dn4lk]

So how did they assemble the other crane which lifted the components for this crane?

[@JohnZWetmore]

They use a "small" crane to assemble the big crane, which assembles the tower crane. The rigging crew starts very early in the morning.

[@lrmuanpuia9929]

Fulll sport😮😮

[@philcollins2289]

rien de compliqué 👏🇨🇵🖐️

[@user-ph8ge7fy3b]

👏👏👏👍👍

[@marcneville42]

Los trabajadores: a sus cojones estan muy grande.