Help Desk -
9958816305, 9810335381

Sanska Completes Empire State Building 102nd Floor Observatory Renovation

Infra News - Published on Wed, 06 Nov 2019

Image Source: usa.skanska
On Saturday, October 12, Skanska joined Empire State Realty Trust in celebrating the opening of the renovated Empire State Building 102nd Floor Observation Deck. Skanska served as construction manager for the $165 million renovation as part of a larger top-to-bottom effort to redesign the landmark’s Observatory experience. The centerpiece of the 102nd Floor renovation was replacing the old windows – which stopped at waist level – with 360-degree floor-to-ceiling windows offering unobstructed, panoramic views of the city. To complete this complex renovation without disrupting normal building operations – including access to the 86th Floor Observatory from 8am to 2am every day – Skanska employed an innovative “cocoon” enclosure system modeled after one first used by Skanska on a previous project to reinforce the building’s mast and broadcast tower.

To provide access for the team to complete the renovation while simultaneously protecting the public below, Skanska partnered with Plan B Engineering and Greg Beeche Logistics to design, fabricate, and install a fully enclosed scaffolding structure – the “cocoon” – around the 102nd Floor. In order to construct the cocoon, a structural “halo” with hoisting carriage was first built around the 103rd Floor; this system was then used to assemble and hoist sixteen trapezoidal modules from Level 90 to 102 where they were docked and connected to one another in succession. This exterior work was performed nightly between the hours of 2am to 7am. Upon completion, the cocoon was 26 feet tall, weighed roughly 30 tons, and provided 600 square feet of exterior work space across two deck levels. It was designed to withstand all construction live loads in addition to wind gusts of up to 98 miles per hour.

With the protective cocoon in place, the Skanska team was able to demolish the existing façade and replace it with the new glass exterior, which is comprised of two dozen 450-pound glass units each measuring 8 feet. The veneer curtain wall system is mounted to original building steel and incorporates custom exterior trim pieces that were designed to match the historic aesthetic of the iconic façade.

The team also removed several mechanical shafts and replaced them with transparent mesh enclosures to improve sightlines for Observatory guests. The 102nd Floor is now illuminated by miniature LED floodlights that are programmed to adjust color based on time of day, maximizing visual acuity during both day and night.

Source :

Posted By : Ratan Singh on Wed, 06 Nov 2019
Related News from Infra segment