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Platinum Award: It took courage for a developer and his infrastructure team to take on a site that others had avoided for nearly a century.
Robert Cassidy, editor-in-chief
Photo: Nick Ulivieri Photography, courtesy of Clark Construction
The construction of the pencil. This is what passers-by already call 150 North Riverside, the newly opened 54-story construction along the river in downtown Chicago.
No wonder. Seen from the north or south, its silhouette resembles a giant stylus stabbed on an urban plot.That design can balance such height and mass on a point base 39 feet wide defies imagination.
This 150-century North Riverside, built effectively, despite technical limitations that frightened underage mortals for nearly a century, is a testament to the developer’s value, Riverside Investment
Building Team Awards judges were so inspired by the team’s determination to surpass each and every one of the possibilities that unanimously revered the 150 North Riverside with this year’s only Platinum Award.
Let’s see what made this task so exceptional, starting with our own.
The gigantic crane coming out of a barge on the river. Photo: Nick Ulivieri.
Five years ago, after retiring as President of John Buck Company, John O’Donnell, CEO of the new Riverside Investment Company
– Tony Scacco, Riverside Investment
To save space for paintings, the team proposed to build a 1 1/2 acre “bridge”, or platform, on the tracks.Usually, the bell boxes would have provided sufficient structure for such a platform.But general contractor Clark Construction knew, through his paintings at a nearby structure site, that digging bell boxes can produce a lot of messy debris that they want to be removed; They also require a giant platform that requires time to demobilize.Since the piles can only be trilled from 1 a.m.at 5 a.m. to avoid hitting amtrak service, doorbell boxes were excluded as a structural option.
MKA and geotechnical representative GEI redesigned the foundations into a nine-inch-diameter “micropilot” system.This allowed Clark Construction to use a smaller platform that did not cause damage and can only be maneuvered temporarily in and out of the yard.But they also knew they had to restrict the total number of bets, which meant that bets had to be as strong as possible.”We went out with micropilots at 400 kip, but GEI said the less we had to dig, the better, so we continue to expand,” said Robert Chmielowski, PE, SE of MKA.
In the area of approximately 4 months, Clark Construction sank more than one hundred and six hundred kip micropilots – the largest capacity piles ever installed in Chicago – between the tracks.”In terms of resistance, six hundred kip are out of standard,” Chmielowski For the base of the tower, MKA designed 16 fully reinforced boxes, 10 feet in diameter, that were drilled six feet into the rock bed.The team also planned ahead of time the design of the base reinforcement so that only one terrain could be added.to the structure halfway through the structure at the request of the developer.
The street-level bridge allowed Clark Construction to provide advanced application service and heavy appliances to the site, speeding up work.As for Amtrak’s service, “we had no interruptions,” said Chris Phares, PE, Clark Construction’s assignment manager.
This supported the Amtrak component of the project. In front of the riverside site has a brand new problem solving exercise.
An elaborate micropilot, box and metal frame the tower. Magnusson Klemencic Associates.
Goettsch Partners and MKA had designed buildings that rose from a narrow pedestal: Goettsch, in their design for Sowwah Square, Abu Dhabi; MKA, in his paintings at Rainier Tower, Seattle.In consultation with Clark Construction and GEI, they used this experiment to create the four-story inclined metal farms that the 28,000-square-foot earth plates in the tower.
Again, the area was limited. Amtrak insisted that the installer crane will need to be able to raise 150% of the load (130,000 pounds of prefabricated concrete platform beams at a time) at a distance of 225 feet from the center.There was no way for a crane of this length to maneuver in the limited area available.
The structure team sought inspiration in the east.”We made a decision about the river, not as a liability, but as an asset,” Phares said.”We said, let’s put the crane in the river and make it as big as possible.”
That’s what they did. Clark Construction has tied 31 Poseidon barges in combination to shape a floating platform.They installed a two-million pound Manitowoc 888 Ringer crane capable of lifting 1.3 million pounds at a time.
“We assemble the giant portions that can be transported on the road, 60,000 pounds each, and assemble them on site as a set of installers, in sets of a quarter of a million pounds,” Phares said.Chicago Steel Construction was able to seamlessly lift the huge farms instead.”We attracted giant crowds on the street and on the bridges when we did that,” Phares said.
– Chris Phares, Clark Construction Group
All these rivers required the cooperation of the city, the Coast Guard, the Army Corps of Engineers and the Metropolitan Water Recovery District.
“Without this point of cooperation, we would make a big hole here,” said Erik Harris, AIA, CDT, associate director of Goettsch Partners.
The team addressed the structure’s ability to cope with wind acceleration and swinging at higher levels, which is very important for occupant comfort, Chmielowski said.They specified high-strength, high-rigidity concrete to harden the core of the structure.
The design team also designed 12 water-filled tanks in 3 equipment on the roof to serve as a regulated liquid surprise absorber.Once the design was completed, MKA monitored the design dynamics as built to determine the maximum effective water height.which turned out to be 3 feet, five inches, not 4 feet, as estimated in the first place.”Now the tanks are in tune with the way the design behaves in front of the wind,” Chmielowski said.
In general, inventions brought through the structure equipment, such as the use of bolted connections that are welded into metal components, have reduced 60,000 hours of paints and $3 million in costs, according to Clark Construction.
LEED Gold pre-certified (Core
– Robert Chmielowski, MKA
“We don’t build monuments for ourselves,” said Anthony Scacco, executive vice president of Riverside Investment.
Turns out, in more tactical than one, 150 North Riverside was drawn.
Construction Team – Bidder, General Contractor Clark Construction Group – Chicago Riverside Investment Developer
Overview – Size 1.2 million Cost $270 million Construction time September 2014 to January 2017 Cm delivery mode at risk
Back to the home of the Building Team Awards 2017
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Illustration: NBBJ
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