Skip to comments.Wilshire Grand Breaks Record For Largest Concrete Pour
Posted on 02/16/2014 4:31:57 PM PST by BenLurkin
LOS ANGELES (CBSLA.com) Developers made history Sunday at the site of the former Wilshire Grand hotel in downtown Los Angeles.
Adjudicator for the Guinness Book of World Records Michael Empric announced just after 11:30 a.m. that workers had broken the world record for the longest continuous pour.
The Wilshire Grand has a largest pour of 21,200 cubic yard, which is a new Guinness World Records title, Empric said.
The Associated Press reports that the concrete pour of 82 million pounds of concrete lasted over 18 hours. The concrete was poured into a massive pit in order to build the foundation for the much-anticipated, 73-story tower.
Its a symbol of a Los Angeles thats coming back, Los Angeles Mayor Eric Garcetti said Saturday. Its putting the recession in the rear-view mirror, creating jobs.
Along with breaking the world record, planners had also expected to save funds due to the consecutive pouring as opposed to taking breaks in between.
The $1 billion project includes office space, restaurants, retail, and 900 hotel rooms.
The hotel is scheduled to open in 2017.
Hoover dam was bigger, and it was continuous.
How would it feel to be that high during an earthquake?
Hoover dam was a lot of separate pours. They allowed the concrete to dry before pouring the next level.
The vibrators had the biggest and hardest job
Now ... if they were going to pour 73 stories of WALL ... now THERE'S a Guiness World Book of Record !!
OOPS ... write (pun intended) in front of my eyes ... 21,200 yds
A whole lotta shakin’ goin’ on.
“Hoover dam was a lot of separate pours.”
They had to keep stopping to fish bodies out:-)
“They had to keep stopping to fish bodies out:-)”
I’m not certain that they actually did fish the bodies out.
As I recall reading about the building of the dam, they became part of the foundation.
That’s a lot of kickbacks.
The following is a excerpt from a previous post.
73 floors? In LA? Doesn’t seem wise.
How would it feel to be that high during an earthquake?
This been an excerpt from a previous post.
The following is the entire text of my reply
The previous was the entire text of my replay.
I’ve seen that hole at 7th and Fig here in downtown L.A (the better part of DT LA). Didn’t dawn on me that construction for the building required that much amount but I think the building is just to top the opposite building across it.
1,177 yards per hour.
118 trucks an hour.
looks like they have 11 boom pumps.
107 cy per pump per hour.
that's dumping some concrete.
if they were pouring a 4" thick driveway that would be 1,696,000 SF.
73 stories in one of the most seismically active places in America??
Kinda scary, if you ask me.
It was always my understanding that if you pour too much concrete at once the heat would make it take forever to set. I read the reason they poured the Hoover Dam in sections is that if they had poured it all at once it would still be curing today. I imagine concrete has gotten better in the last 80 years but I would think the general principle woudl still be the same
That’s what I was wondering. Certainly the dam couldn’t have been continuous from bottom to top, could it? How would the bottom of the forms withstood the concreto-static pressure till it cured? I’d have assumed they’d pour it like a layer cake in maybe 20-foot layers. Even if it wasn’t, I could still see single pours bigger than this one. But how would Guinness have missed such an obvious one? And what about 3-gorges dam in China? That one’s immense.
A body would a been a problem with structural integrity.
I understand from both civil engineers and concrete companies that all concrete indeed cures forever.
But for max. strength, it has to cure a certain percentage, and that can be delayed with too large a pour......
I can’t believe they did pours in inches at a time. Sheesh, they’d still be pouring the thing today. I’m thinking more like 10 or 20 ft of height at a time. Reasonable balance of required form strength and progress rate.
7th and Fig? They didn’t tear out The Pantry, did they? Great restaurant. My uncle tiled the place.
I think The Pantry is at about 4th or 5th, isn’t it?
Actually, the damn concrete IS STILL curing.
They used cooling pipes and pumped chilled water through them. They also poured the concrete in sections. Supposedly the concrete is still curing.
According to wikipedia regarding Hoover Dam: “Concrete cores were removed from the dam for testing in 1995; they showed that ‘Hoover Dam’s concrete has continued to slowly gain strength’.” So, it seems to still be curing. I’ve read that somewhere else.
And because when concrete sets up, its an exothermic ( heat producing) process, deep inside Hoover it’s still HOT. The dam actually has hundreds of miles of piping inside the concrete..water runs through it to cool it..
Pantry Is 9th and Fig
“...concrete blocks in columns were poured, some as large as 50 feet (15 m) square and 5 feet (1.5 m) high. Each five-foot form contained a series of 1 inch (25 mm) steel pipes through which first cool river water, then ice-cold water from a refrigeration plant was run. Once an individual block had cured and had stopped contracting, the pipes were filled with grout.”
Look at the bright side: If it comes down, lots and lots of ‘Rats are gonna get squished.
I think that’s now called Engine No 28, and it’s right after you get off the subway or Red Line. If that’s it, then it’s still there.
When the Big One hits — some water is likely to get sloshed out of that 73rd floor pool.
If each area is, lets say 20' x 20', that's 400 sq ft. That means each bucket would drop 6" of concrete.
The Pantry is a block south of there — was still in business several years ago.
I wasn’t disagreeing.
with all the rebar and cooling pipe and only dropping in 8 yd at a time, It would have been near impossible for someone to get poured over
Oh yeah, inches per bucket load, sure. I was talking about the depth of concrete that would be liquid at one time.
the heat of hydration actually makes the concrete set faster. It also makes it expand too much and crack. The heat is a problem with thick structures.
Actually, some of the tallest buildings in San Francisco and LA have the greatest structural integrity thanks to isolation pads and dampers as part of their design, which most older masonry buildings lack.
When my friend put an addition on his West LA house, the addition was built on an isolation pad and expansion joints were designed to allow for lateral movement. He got me an invitation to see the dampers in one of the LA skyscrapers and meet with one of the structural engineers. Even the plumbing and electrical allow for severe vertical and lateral changes. As an architect I would feel more comfortable in that skyscraper than most of the old multi-family apartment buildings in LA.
Many years ago, I visited a temple in Kyoto that has withstood numerous earthquakes since being built 400 years ago. There wasn’t a single nail or spike in the structure nor any mortar or grout. All the walls were connected to a central support, allowing for severe lateral movement - pretty amazing.
Well, if they were worried about concrete setting up in the bucket, I'd imagine within a few buckets poured, that the first bucket would start setting up.
Also, rebar would have to be set in place, as well as cooling pipes. So, I imagine they might only do a couple of feet a day per cube. But I really don't know.
Most of the time it is impossible to get the body out when someone falls into a large live pour such as they would do on a dam. 20 to 25 cubic yards or more in one dump is a lot of concrete to be trying to fish out a corpse from.
Lots of fun.
“There are no bodies in the dam.”
But, but , but... There was a song about it.
I was a dam builder across the river deep and wide
Where steel and water did collide
A place called Boulder on the wild Colorado
I slipped and fell into the wet concrete below
They buried me in that great tomb that knows no sound
But I am still around..I’ll always be around..and around and around and
around and around
Respectfully, they have pretty much mastered how to build skyscrapers in SoCal that withstand quakes. I was in one, in 1990 during a seismic event, it shook like crazy, but no damage. They are built on gigantic rollers. You may recall the 94 event in Northridge. Most of the fatalities were in a three story apartment building. There were freeway collapses, the scoreboard at Anaheim Stadium tumbled into the seats, damage occurred as far as 80 miles from the epicenter, and it was felt in Las Vegas, nearly 300 miles away. None of the high rise buildings in the zone were catastrophically damaged.
When the light hits the face of the dam just right.... you can make out the impressions of the faces....
Hoover dam serendipitously utilized non-reactive aggregate in the mix, and that concrete turned out to be just about some of the best concrete you could make, even to today’s standards.