they started building the cn tower in 1989.
they started building the cn tower in 1989.
when did they start building the cn tower?
1989
construction on the cn tower began on february 6, 1973, with massive excavations at the tower base for the foundation. by the time the foundation was complete, of earth and shale were removed to a depth of in the centre, and a base incorporating of concrete with of rebar and of steel cable had been built to a thickness of . this portion of the construction was fairly rapid, with only four months needed between the start and the foundation being ready for construction on top.
cn tower
"guinness world records" has called the cn tower "the world's tallest self-supporting tower" and "the world's tallest free-standing tower". although guinness did list this description of the cn tower under the heading "tallest building" at least once, it has also listed it under "tallest tower", omitting it from its list of "tallest buildings." in 1996, guinness changed the tower's classification to "world's tallest building and freestanding structure". emporis and the council on tall buildings and urban habitat both listed the cn tower as the world's tallest free-standing structure on land, and specifically state that the cn tower is not a true building, thereby awarding the title of world's tallest building to taipei 101, which is shorter than the cn tower. the issue of what was tallest became moot when burj khalifa, then under construction, exceeded the height of the cn tower in 2007 (see below).
cn tower