Straightness Monitoring
Lotte world Tower, which is currently under construction in Jamsil, Seoul, will become the nation’s first building to use the Global Navigation Satellite System (GNSS). This technology is currently used in the Burj Khalifa of Dubai and One World Trade Center in New York.
The 2nd Lotte World Safety Management Committee held a conference for construction technology with the theme of “technology of measurement and a straightness management system for the Lotte World Tower skyscraper” in the promotion hall of Lotte World Tower on May 26.
The conference was attended by Gachon University Civil and Environmental Engineering Department Professor Park Hong-ki; former Chairman at the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography, Kyungdong University Architecture and Civil Engineering Department Professor Lee Young-do; and Vice Chairman at the Korea Institute of Building Construction, Tais Engineering Co. CEO Park Tae-sik. They presented technologies of measurement and straightness management for the Lotte World Tower skyscraper.
Prof. Park Hong-ki said, “Lotte World Tower is the nation’s first building to use both a GNSS and Structural Behavior Monitoring System by inclinometer at the same time.”
GNSS is the satellite navigation system that provides 3-dimensional (3D) positioning of any object on the Earth. This technology is used for the Burj Khalifa of Dubai and One World Trade Center in New York. For Lotte World Tower, both measurements observed by at least four satellites and measurements by seven inclinometers, which show how much a building tilts, will be monitored. Based on these measurements, Lotte World Tower will be constructed with the highest accuracy possible, reflecting the movement of the building, said Lotte Engineering & Construction Co.
Prof. Park. He also said, “The technology to measure straightness management using the GNSS allows not only for managing the building’s straightness but also shortening the construction period. Moreover, it enables stable maintenance and management of the building through steady long-term monitoring. After reviewing the measurement data of Lotte World Tower’s structural verticality, we have found out that it is within acceptable standards. Through advanced measurement technologies just like GNSS, the straightness of the skyscraper is being strictly controlled.”
He also stressed, “The surveying working rules of domestic construction companies are limited to the roads, rivers and building lots sectors. So, new work regulations and applications for general measurement in buildings, which need precise construction like skyscrapers, are urgent.”
In a bid to ease public concerns and better understand the construction of Lotte World Tower, the 2nd Lotte World Safety Management Committee has been regularly conducting briefing sessions with specialized organizations and professors in related areas from Dec. last year.