Chicago Residential Towers - (Page 7) SPECIAL ADVERTISING SECTION the sloping concrete shear walls and the curtainwall. The garage is from levels 2 through 12, and the residential units begin on level 13. Penthouses are on levels 37 through 40 and the amenities floor is on level 41. The concrete is mostly exposed throughout the units (shear walls, ceilings, columns) and common areas. There were specific procedures put in place to eliminate markings from deck layout and mechanical layout. All mechanical/electrical/plumbing rough-ins had to be well coordinated because there were exposed ceilings in all the residential units. The hoist had to be located in the alley to the west of the building, which limited the size of delivery trucks for materials and dumpsters. The concrete pump had to be located in the lobby area, and protection had to be placed around exposed concrete columns to allow concrete ➤ Those who worked at or below grade on 600 North Fairbanks had a very small site in a highly congested area. It was not always possible for the excavator to work during normal hours, due to traffic and jobsite conditions-sometimes not enough room on site for it to work along with other trades. The excavator, Roy Strom Company, employed smaller equipment than normal to work in tight spaces during the day. Much of the digging was done on weekends and evenings so as not to disrupt daytime construction on site or traffic in the public right of way. Scheduling work under these conditions was tricky at times, but Strom spokesman Mark Parus said they were always there when needed, and always finished on time. One Museum Park presented a totally different set of obstacles. The original shoreline of Lake Michigan ran north to south directly under the center of the new building. Back in the 1800s a seawall was constructed in this location using timber piles and large limestone boulders. Eventually, the lake was filled from this location eastward to create land for Lake Shore Drive, The Museums, Soldier Field, Burnham Park, and Northerly Island. To facilitate installation of caissons and earth retention, the Roy Strom people had to excavate down to the old shoreline structures and remove them as much as possible. To do so, they excavated holes as deep as 30 ft, putting them 15 to 20 ft below the water table. Groundwater filled the holes almost as quickly as they were excavated, so it became necessary to feel around with the excavators under water to locate the piles, boulders and other obstructions. Once removed, the crew backfilled the holes with dry imported material, as the soil from the excavation was too wet to re-use. As the project was so close to the lake the Strom team was working on very soft silty clay, so had to utilize low ground-pressure equipment for much of the work. Subsequently Roy Strom Company has begun work on Museum Park West, with a topdown excavation method as shown in the photo. ■ EXCITING EXCAVATIONS 600 N. Fairbanks Electrical: ABCO Electrical Contractors Concrete: Adjustable Forms, Inc. Carpentry: ALCA Carpentry Granite & natural stone: Chicago Marble Glazing/curtain wall: Permasteelisa CS Scaffolding: Prime Scaffold Foundation/caisson/earth retention: Revcon Construction Excavation: Roy Strom Company Consultants & testing: STS Consultants Earth rtntn/foundation: Thatcher Foundations Plumbing: Thomas H. Litvin Midwest Construction 7 http://midwest.construction.com
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