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The Thrill of Victory - Structure Tone Inc.

The Thrill of Victory - Structure Tone Inc.

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18©John Baer/PDM PicturesSo It Growsby Jason VesuvioThroughout summer and fall, spring isin full swing at Pavarini McGovern’sNew York Law School project at185 West Broadway. After months <strong>of</strong> belowgrade construction activity, steel hassprung above ground, bringing with it thepublic’s first glimpse <strong>of</strong> the building-to-beearly next year.Construction began in earnest last year withthe installation <strong>of</strong> the bathtub/slurrywallfoundation, structural columns and loadbearing elements (LBEs). For 12 hours perday over a period <strong>of</strong> many months, threelarge cranes, as well as assorted excavators,backhoes and trucks, danced around oneanother on this tiny site. <strong>The</strong> flurry <strong>of</strong> constructionactivity was impressive—but all <strong>of</strong>it out <strong>of</strong> sight.<strong>The</strong> 209,000sf building was designed withfour below and five above-grade levels. Dueto a high water table, pre-trenching and installation<strong>of</strong> a slurry wall system was requiredto create a waterpro<strong>of</strong> concretebathtub. <strong>The</strong> foundation walls and LBEsreach bedrock at approximately 100ft.So it grows…Several months ago, the team completed thefoundation and transitioned into the “topdown”phase, a method <strong>of</strong> constructionwhereby the erection <strong>of</strong> floors above andbelow-grade proceed simultaneously. First,the team poured the ground floor concreteslab, which provided massive rigidity andbracing for the slurry walls as excavationproceeded underground. <strong>The</strong> team thencreated two, temporary, large square voidsnear the center <strong>of</strong> the slab so that a crawlercrane, affixed with a clamshell bucket, couldremove earth from beneath the slab. <strong>The</strong>team poured concrete every 15 feet, andcontinued to mine downward until fourconcrete slabs had been poured, essentially“bottoming out” the project approximately60 feet below ground.So it grows… With steel erection, the superstructure begins to take shapeWith mining activities complete and thelower slabs poured, the team sealed thevoids created for mining and began upwardconstruction <strong>of</strong> the superstructure steeland metal deck. <strong>The</strong> interior constructionprogram also got underway and includeselectrical, HVAC and framing work inunderground levels, as well as a perimeterwall <strong>of</strong> masonry block on each floor that concealsthe foundation.By autumn, 185 West Broadway will bewatertight and the interior fit-out and finishesprogram long underway. <strong>The</strong> new buildingwill primarily be a curtainwall-clad box,accented with stone and painted metalcladding, as well as somestainless steel details atthe base. <strong>The</strong> buildingwill house academic andadministrative spaces, alaw library, student andfaculty dining, and state<strong>of</strong>-the-artA/V and technologysystems.By early 2009, thoughdecidedly cold in Manhattan,New York LawSchool’s 185 WestBroadway building willbe in full bloom. So itgrows…©John Baer/PDM Pictures Clamshell bucket removes earth frombeneath the slab through temporary voids inthe slab <strong>The</strong> clamshell bucket is lowered 60ftbelow ground, hollowing out the groundbeneath the slab©John Baer/PDM Pictures ©John Baer/PDM PicturesV O L U M E I V | Q III | 2 0 0 8

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