PROJECTS

Located in the center of Nagasaki City, the Nagasaki City Hall has been completed more than 60 years ago, and the reconstruction project was planned to resolve the issues of aging and earthquake resistance, and to make the building a disaster response center that will not stop functioning in the event of a large-scale disaster. The planned site is the former site of the former Nagasaki City Public Hall, a symbol of postwar reconstruction, and is located in the city’s old bustling and cultural center district. The city hall, which is visited by citizens on a daily basis, was considered important to contribute to the liveliness of the area, and we aimed to create a space where people can freely spend time before, after, or even after running errands, with a coherent plaza space, a waiting area facing the plaza, a multipurpose space with terrace and cafeteria, and a rooftop garden that offers a panoramic view of the Nagasaki cityscape. The building is made of RC lattice frames and CLAIR. The building’s “outer shell structure” of RC lattice frames and CLT earthquake-resistant panels enhances the effectiveness of the seismic isolation structure, while the lattice frames provide solar shielding and the CLT panels improve thermal insulation performance. Based on this external skin structure, combined with equipment systems such as ceiling radiant air conditioning, the building has received ZEB Ready certification. The building has been reborn as a new Nagasaki City Hall that combines earthquake resistance as a disaster prevention base and decarbonization as a social requirement.