A storage facility for archiving furniture, products, and artwork in Miyota-machi, Nagano Prefecture, with a guesthouse attached. Located in a quiet and nature-rich environment where streams weave through a thick forest of red pine, the tunnel-like architecture took shape through a combination of precast and prestressed construction methods.
For precast construction, common parts are molded in a factory and assembled on site. An example of its applications in infrastructure projects is the box culvert (box-shaped concrete structures), used to store waterways, pathways, power lines, and communication lines buried underground. However, since the method itself does not provide a leak-free composition nor does it allow for stacking, both necessary for this architecture, prestressing was also used to connect the parts together.
The prestressing method is a technique used in civil engineering structures such as bridges, in which the parts are aligned and then tightened with wires to connect them. This results in a seamless and smooth surface finish, obtaining a tight seal, and durability.
常见的方形部件每个重约12吨，建筑总共使用了63个零件。部件的尺寸根据送货卡车的装载尺寸和起重机可以负荷的重量而定。项目的入口角落采用一般的箱形涵洞中常见的45度钢筋，作为支撑并增强抗震性。通过连接这些部件，创建了一个内部尺寸约为2 x 2.3 m的细长隧道形空间。使用十四根钢索连接每个“隧道”，并对每根钢索施加均匀的张力。随着时间的推移，钢索逐渐收紧，最终对每根钢索施加的张力将达到46吨。
The common square-shaped parts weigh approximately 12 tons each, and a total of 63 of these parts were used. The size of the parts was derived from the loading size of the delivery truck and the weight that could be lifted by a crane. The 45-degree reinforcement at the entry corner, which is also found in general box culverts, serves as a brace and enhances earthquake resistance. By connecting these parts, a slender, tunnel-shaped space with an internal dimension of approximately 2 x 2.3 m was created. Fourteen wires were used to connect each “tunnel” and care was taken to apply uniform tension to each wire at all times. The work involved gradually tightening the wires over time until a tension of 46 tons was finally applied to each.
The building is composed of four stacked “tunnels” covered with a roof in the center. In addition to a long, narrow storage room with a depth of approximately 40 meters, there are two smaller storage rooms, but it is envisioned that more will be added to the site in the future as the collection grows. The kitchen, bathroom, toilet, and other water facilities are concentrated on the first floor, and a compact bedroom and a study are located on the second floor.
The windows were made without metal frames as much as possible, and high-transparency glass measuring up to 10 meters in length was fixed into the grooves in the same manner as shoji screens. The gravel and plantings used in the exterior were also arranged in the interior to draw the outside environment into the interior. To make it easier to walk on, the gravel was partially hardened with resin. Instead of just pouring resin over the gravel, which is usually the case, the resin was applied to the base first and then gravel was laid on it so that the surface wouldn’t become glossy. In addition, the door handles would have looked abrupt if installed as-is, so an original handle was designed, which hides in the small gap between the door and the wall. The bathtub is carved into the floor, such that the water surface aligns with the floor, creating the appearance that the tunnel shape is continuous.
The resulting space is less architectural, but rather a project that combines civil engineering concepts with product design details.
Collaborator: Noritaka Ishibayashi, Ryota Maruyama, Daisuke Maeda, NIITSU-GUMI, P. S. Mitsubishi Construction
Photographer: Daici Ano, Takumi Ota
filming and editing : Toru Shiomi
filming: Takahisa Araki, Masaya Yoshimura
更新日期：2022-08-03 15:28:49非常感谢 nendo 带来的精彩项目， 查阅更多