From Construction.com
2000 Renovation Project of the Year
Chrysler East Building
Tishman Speyer Properties of New York, N.Y., has transformed the former Kent Building into the Chrysler East Building Addition, and with adjoining properties, including the Chrysler Building, created Chrysler Center - changing both the streetscape and skyline on "the other 42nd Street."
To create this $53 million transformation - which took place while the building was occupied - a new facade was added following a build-out rather than a buildup of the existing building. The buildout added 150,000-sq.-ft. to the west side of the building, turning it from a side core building into a central core structure.
Because the building was occupied, nights and weekend work became the rule of thumb for this project's construction crew. To add the 150,000 sq. ft. of new construction, existing columns at the building, 666 Third Avenue, were stripped to bare steel and then enclosed in concrete.
And, because of the new load created by the additional space, the building's existing columns, from the foundations to the 14th floor, had to be reinforced. To reinforce the columns, a composite structure was developed. The composite structure encased the existing columns with concrete and included the addition of rebar and shear studs to increase the load capacity of the columns to add more than 20 floors on top of them.
In addition, some of the footings were underpinned. To achieve this, three of the existing footings were enlarged by adding new concrete and footings under the existing footings. This required rock excavation inside and below the existing structure.
At the 14th floor, the existing structure at the north side of the building required a two-story-high truss system to transfer the load of 22 floors above it.
Other challenges included recladding the facade and construction of pyramids on grade. The new facade, consisting of dark gray curtain wall glass with a "bustle" or big bay window that orients the tower toward the Chrysler Building, was reclad to make the addition and the existing building appear as if it were one. The three 65-ft.-high glazed glass pyramids, located id-block at street level, were designed to provide cohesion to the block. The idea of the pyramids is to recall the top of the Chrysler Building, which at night, has been described as chards of light. The windows at the top of the Chrysler Building are triangular. Therefore, the street level pyramids help bring the image of the top of the Chrysler Building to street level and add to the cohesiveness and identity of Chrysler Center.
One of the project's biggest design challenges was to figure out how to put a new skin on the building within four inches of the existing facade without removing the existing exterior. The solution was to allow the existing skin to remain because the design and construction team was legally limited to four in. beyond that with which to install a new skin and to have a custom-made curtain wall that met the design specifications. The curtain wall was installed using Hek machines. These consist of a moving platform mounted to the building with tracks around the entire perimeter of the existing building to allow workers access to the outside skin without disrupting tenants' day-to-day operations inside. It also provided for a lot safer operation than a typical hanging scaffold.
The jury said the Chrysler East Building was a difficult project to execute because of its logistics, design specifications and the fact that all of the work had to be performed in the building while it was occupied, including the construction of an addition on one side of the building. They praised the project team for its efforts in helping the owner transform the streetscape and skyline to create Chrysler Center.
Chrysler Trylons during construction on 26 November 2000.
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