Precast Concrete Components Assembled On-Site
Shorter Construction Periods and Uniform Quality Expected
Adoption Rate for Apartment Underground Parking Lots Doubled
Lotte Construction announced on September 22 that it has achieved significant results in the off-site construction (OSC) sector by registering a total of 14 patents related to precast concrete (PC) modular (prefabricated) and PC construction methods over the past two years.
The PC construction method involves manufacturing concrete components in a factory and then assembling them on-site. It is mainly used for underground parking lots and large-scale structures. The expanded PC modular method allows for the completion of three-dimensional spaces, such as rooms or bathrooms, in the factory, so that on-site construction can be finished simply by combining the modules. Both methods are attracting attention as core technologies for the future of construction, as they help shorten construction periods, ensure uniform quality, and reduce carbon emissions.
Lotte Construction is using the precast concrete method to construct underground parking lots at multi-family housing sites. Lotte Construction
One of the key patents registered by Lotte Construction is the "Construction Method for Buildings Applying a Wet Joint Method Between PC Modules" (Registration No. 10-2691184). This method involves leaving a gap between modules and filling it with non-shrink mortar to join them, which compensates for errors that may occur during manufacturing or assembly. When modules are vertically stacked, a double-floor structure is formed, which can help reduce noise between floors. Since existing architectural design standards can be applied as they are, even designers with little experience in modular design can easily utilize this method.
Another patent, "Construction Method for Buildings Using PC Modules" (Registration No. 10-2740074), enhances transport stability, allowing interior materials to be installed at the factory. Previously, interior finishes were installed on-site due to concerns about damage from vibrations and shocks during transportation, but Lotte Construction addressed this issue by reinforcing the support structure. As a result, the company has established a foundation for improving both quality and work efficiency.
On-site application has also expanded. Lotte Construction has more than doubled the adoption rate of the PC method for underground parking lots in apartment complexes, increasing it from 23% to 46%, and has introduced the Double Wall method to the lower sections of major buildings. The Double Wall method involves pouring concrete on-site between two thin reinforced concrete panels, which serve as formwork, making it effective for shortening construction periods.
A representative from the Lotte Construction Technology Research Institute stated, "By securing these patents, we aim to change the paradigm of construction methods, achieving both shorter construction periods and reduced safety accidents. We will continue to develop technology and strengthen our competitiveness to provide the highest quality to our customers."
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