It is a public library in Tonami City, Fukuoka Prefecture, Japan. In combination with the local characteristics, it provides people with gathering and leisure places. In order to achieve this idea, we adopted the design concept of“The One-Roomed Library Under the Big Roof”. Tonami plain, once a granary area, inherits the beautiful rural scenery known as "scattered villages". Taking the appearance of the local traditional main house "azumadachi" as the theme, we conceived the appearance of the library's big roof. The interior decoration adopts the bright color of tulip, the flower of Tonami city.
We built the front of the building towards the west to form a landmark expression with the main road. In order to prevent the book paper from yellowing and deterioration, it is necessary to prevent the Western sunlight from directly shining into the library. We simulated the sunshine in the west, adjusted the height of the eaves for many times, and finally determined the gentle slope roof shape from high to low.
The trees planted on the west side have also been carefully selected. According to the different seasons, trees create different atmosphere appearance for the whole facility, and also have the effect of blocking the Western sunlight.
In order to create the indoor space effect of "one room", we use steel truss beam to minimize the number of pillars. Because the roof is a steric curved surface, the shape of each section of the beam inside is different. While we accurately measure the height of each part through 3D CAD, we carried out the construction.