After 13 years of planning and site preparation,
the tower gained final approval to start construction by the government in November 2010
and the first groundbreaking activities of piling and frame assembly were observed at the construction site in March.
At New Year 2016 the LED-pixels of the facade showed "2016".
On April 2, 2017, Lotte shot off fireworks to celebrate its official opening.
On Jan 1, 2018, Lotte shot off fireworks with LED laser show for 7 minutes to celebrate New Year's Day
and the 2018 PyeongChang Winter Olympics.
Design
In 1989, the first design was made and there was a plan. Design changed again in 1994,
1995 and 1997. The design that came out of the second Lotte World in 2002 was similar to that of France,
which literally copied the Eiffel Tower. Following the revision of the bird's eye view from 2004 to 2006,
the bird's eye view was changed seven times in 2008 and the design
was changed in 2009 and the Lotte World Tower began to break ground.
The Shard of England is said to be similar in design. The Shard,
the design of renowned Italian architect Renzo Piano, was launched in 2008 and completed in 2012 and opened in 2013.
Its interior and elevator atmosphere are similar. In addition, space externally on the roof tower is similar.
Height
On March 17, 2016, prior to the final phase of external construction, the Diagrid lantern-shaped roof structure was completed.
The roof structure was constructed with steel counterparts that are each 12 meters and weigh 20 tons.
The counterparts were made up of bent metal panels that are 6 cm thick,
and the structure itself is 120 meters high, and it covers floors 107–123.
Approximately 3,000 tons of steel parts, a high-precision 64t tower crane,
high-precision GPS alignment systems and highly skilled welding technicians were used in the construction of the roof itself.
The roof structure is engineered to withstand its weight without reinforcing pillars,
and endure earthquakes up to a magnitude of 9 under the Richter magnitude scale and winds up to 80 m/s.
[Source, Wikipedia]
