We build based on safety and trust.
We build based on safety and trust.
As demonstrated by some of the high-rise buildings around Lake Michigan in Chicago in the U.S., the safety of these types of buildings has been proven through geology and civil engineering.
To construct Lotte World Tower, 30 meter long 108 piles with a diameter of 1 meter were installed in bedrocks for reinforcement, and 72 meter wide and long mats with a thickness of 6.5 meter were laid as a foundation.
This massive foundation consists of 4,200 tons of steel reinforcement, including those with a diameter of 5.1 cm, and 80,000 tons of high strength concrete. They are much thicker than those used for Burj Khalifa, which are 3.7 meters thick, and 2.5 times more concrete was used.
In the building’s surrounding area, 1 meter thick and 27 meter long cutoff collars were installed through the bedrock in order to keep underground water from leaking in.
An extensive site survey was carried to make sure that 750,000 tons of tower weight can be supported.
1) Precision Logging of Collected Core and 2) Face Mapping with Excavation of Bedrocks were undertaken jointly with an overseas soil inspector followed by 3) Resistivity Survey and 4) Plate Load Test to identify geological structure, the types of bedrock, soil strength, and deformation for designing the mat foundation.
For the steel reinforcement for the mat foundation, HD500 D51mm large caliber steel reinforcement was used. 5 layers of HD51 were installed at an interval of @200mm for the lower part, and 3 layers of HD35 were laid at an interval of @200mm for the upper part.
At a height of 555 meters, the average wind velocity is 55m/sec. (the maximum wind speed during Typhoon Maemi in 2003). Lotte World Tower is designed to withstand an instantaneous wind velocity of 83m/sec. That means that it can withstand an instantaneous wind velocity of 75m/sec., which was recorded when Hurricane Katrina hit the U.S. in 2005.
It can also withstand earthquake up to a Richter magnitude of 9, which is higher than Burj Khalifa.
The core wall and 8 mega columns support against vertical gravity while outriggers and belt trusses were installed for every 40 levels to serve as a node to ensure that the building stays strong against lateral pressure created by wind or earthquake.
Although small fissures on the mega columns were found during the construction, Korea Infrastructure Safety & Technology Corporation and Architectural Institute of Korea concluded that they were caused by the concrete’s characteristics, and they did not compromise safety in any way.
The structural health monitoring system maintains the safety of Lotte World Tower.
The system monitors the safety and risk level of the building against structural issues and terrorism as well as natural disasters such as typhoon and earthquake at all times.
More than 400 sensors, accelerometers, and clinometers installed in every part of the building to constantly monitor the building’s safety and stability. The integrated monitoring system responds to these risks in real-time.
The perpendicularity of the building is under constant surveillance using the GPS displacement measuring system within 75mm, even during the construction.
More than 7,000 workers a day, 5 million a year, were mobilized for the construction at the site.
We apply strict safety measures in compliance with the manuals to prevent any accidents.
Our multilayer safety measures consist of an ACS vertical safety net, protective screens, fall protection net, protective deck, safety fence, and risk detection sensor for tower cranes. We also enact full safety measures to ensure the safety of workers and the lotteworldmall which have been completed.
We incorporate safety into our daily operation and raise the awareness of safety monitoring staff and security agents through the security reinforcement gate, safety inspection and training, installation of CCTVs, and fire extinguishers.
In addition, external inspectors make sure that there are no safety risks in all our operation processes.
Lotte World Tower is constructed in full compliance with the requirements set by the International Building Code and International Fire Safety Association and reinforced after 9/11.
In case of fire, the fireproof concrete can withstand at least 3 hours while the 19 high speed elevators are set to evacuate people to the 5 designated safety zones.
Furthermore, the emergency staircases are designed to offer a path that is wider than the standard while evacuation guidelines and signs are installed to expedite the evacuation process.
The fireproof structure is designed to contain fire, and its effect has been fully tested and proven by the Korea Institute of Civil Engineering and Building Technology.
To prevent toxic gas and smoke from leaking in, the international standard pressure application system is used for pressurizing smoke exhaustion to ensure safety.
Thanks to these safety systems, it takes less than 15 minutes for 15,000 people inside the building to evacuate to the safe zones on each floor.
A combination of fireproof shutters, 161,000 sprinklers, more than 30,000 fire alarms, a water capacity that lasts up to 60 minutes, and 5 firefighting tanks are utilized to maintain firefighting for 300 minutes in addition to internal fire engines, evacuation facilities, and measures including public and private fire training programs.
At Lotte World Mall, where there is a high level of traffic flow, three evacuation zones are established for the safety of our customers, a first for shopping malls.
All these disaster response activities are managed in an effective and consistent manner at the emergency room located in the control tower.
There are many high-rise buildings in flight safety areas such as John Hancock Tower located near Boston Logan Airport and Taipei 101 near Taipei Songshan.
Lotte World Tower is situated outside any flight safety area and meets all 9 requirements for flight safety set by the Korean Society for Aviation and Aeronautics and reviewed by international inspectors.
The Ministry of National Defense, Air Force, and other related authorities announced that it had changed the angle of runway by 3 degrees to secure the safety distance of 1.8 Km.
In addition, a precision approach radar and terrain recognition alert system were installed in consultation with the Air Force while an aviation safety system equipped with aircraft detectors and warning lamps has been established for safety.