CN Tower

CN Tower

From 1997 to January 2004, TrizecHahn Corporation managed the building and instituted several expansion projects including a $26 million entertainment expansion and revitalization that included the addition of two new elevators (to a total of six) and the relocation of the staircase from the north side leg to inside the core of the building, a conversion that also added nine stairs to the climb.

Structure
The CN Tower consists of several substructures. The main portion of the Tower is a hollow concrete hexagonal pillar containing the six elevators, stairwells, and power and plumbing connections. On top of this is a 102 metres (334.6 ft) metal broadcast antenna, carrying TV and radio signals. There are two visitor areas: the main deck level (formerly known as SkyPod) located at 346 metres (1,135 ft), and the higher Sky Pod (formerly known as Space Deck) at 446.5 metres (1,465 ft),[6] just below the metal antenna. The hexagonal shape can be seen between the two areas; however, below the main deck, three large supporting legs give the tower the appearance of a large tripod.

The main level is seven stories, some of which are open to the public. Below the public areas — at 338 metres (1,108.9 ft) — is a large white donut-shaped radome containing the structure's microwave receivers. The Glass Floor and Outdoor Observation Deck are at 342 metres (1,122.0 ft). The glass floor has an area of 24 square metres (258 sq ft) and can withstand a pressure of 4,100 kilopascals (595 psi). The floor's thermal glass units are 64 millimetres (2.5 in) thick, consisting of a pane of 25-millimetre (1.0 in) laminated glass, 25 millimetres (1.0 in) airspace and a pane of 13-millimetre (0.5 in) laminated glass. Some people experience acrophobia when standing on the glass floor and looking down at the ground 342 metres (1,122.0 ft) below. In 2008, one elevator was upgraded to add a glass floor panel, believed to have the highest vertical rise of any elevator so equipped.[7] The Horizons Cafe and the Look Out level are at 346 metres (1,135.2 ft). The 360 Restaurant, a revolving restaurant that completes a full rotation once every 72 minutes, is at 351 metres (1,151.6 ft). When the tower first opened, it also featured a disco named Sparkles, billed as the highest disco and dance floor in the world.

The Sky Pod is the highest public observation deck in the world.[citation needed] On a clear day, it is possible to see 100 to 120 kilometres (62--75 mi) away, to the city of Rochester across Lake Ontario in the United States, the mist rising from Niagara Falls, or the shores of Lake Simcoe.[citation needed]

A metal staircase with 1,776 steps reaches the main deck level,[8] reaching 2,579 steps by the Sky Pod, and is the tallest metal staircase on Earth.[citation needed] These stairs are intended for emergency use only and are not open to the public, except for three times per year for charity stair-climb events.[9][10][citation needed] The average climber takes approximately 30 minutes to climb to the base of the radome, but the fastest climb on record is 7 minutes and 52 seconds in 1989 by Brendan Keenoy, an Ontario Provincial Police Officer.[10] The fastest record for a woman belongs to Chrissy Redden, who climbed the stairs in 2000 in 11 minutes and 52 seconds.[citation needed] In 2002, Canadian Olympian and Paralympic champion Jeff Adams climbed the stairs of the CN Tower in a specially designed wheelchair.[8]


[edit] Falling ice danger
A freezing rain storm on March 2, 2007 had resulted in a layer of ice several centimetres thick forming on the side of the tower and other downtown buildings. The sun thawed the ice, and winds of up to 90 kilometres per hour (56 mph) blew some of it away from the structure. There were fears that cars and windows of nearby buildings would be smashed by large chunks of ice. In response, police closed some streets surrounding the CN Tower. During morning rush hour on March 5, police expanded the area of closed streets to include the Gardiner Expressway 310 metres (1,017 ft) away from the tower, as increased winds blew the ice farther away, as far north as King Street, 490 metres (1,608 ft) away, where a taxicab window was shattered.

On March 6, the Gardiner Expressway was reopened after winds died down.[11] It was the first time such an event had posed a threat to public safety

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