This is a renovation project on the occasion of a change of ownership of a building complex for which no certificate of confirmation remains. The owner, who is also a bicycle racer, named the building 'RIM' in the initial stages of the project, with the hope that it would be a place that firmly supports the local area and its people, like 'RIM' (the name of the wheel of a bicycle). TOKIWADAIRA, CHIBA Pref., where the project site is located, is an area with rich pedestrian space, crossed by rows of cherry blossom trees, selected as one of the '100 best roads in Japan', and rows of zelkova trees, selected as one of the '100 new Japanese roadside trees'. On the other hand, the existing building had a layout plan with a garden space at the rear, which is rarely seen recently. The design concept was prepared to see if elements of this rich street environment could be incorporated into the characteristic existing building layout.
Specifically, the design was based on creating a communal space that is enjoyable to walk through, with surprised back-garden space that appears when you pass through the narrow entrance approach. In particular, as the existing back-garden had a slightly dark impression, we created a place where users of cafés and shops can take a break and hold events by creating an approach that is easy for people to enter. (tree-lined fence and stone tiles) High-luminosity corrugated plates makes brighten up back-garden and works as a handrail. Functionally, a large eave is added at the top of the building to reduce rainfall in the corridor and to secure an appropriate rainwater drainage route, thereby improving the durability and convenience of the structure. The plan was also to replace the existing decaying handrail with steel columns between the layers, to ensure the strength of the handrail, while also rationalizing it as a large eaves structure.
確認済証が残っていない複合ビルのオーナーチェンジに際したリノベーション計画である。競輪選手でもあるオーナーからは、「RIM（自転車の車輪のわっか部分の名称）」の様に地域や人をしっかりと支える場所になってほしいとの願いを込めて、計画の最初期段階で建物名が「RIM」と命名された。
計画地のある常盤平は、「日本の道百選」に選ばれた桜並木と、「新・日本街路樹百景」に選ばれたケヤキ並木が交差する、豊かな歩行者空間のある地域である。一方で、既存建物は現在ではあまり見られない奥側に庭スペースのある建物配置計画であった。
設計方針としては、この豊かな街路環境の要素を特徴的な既存建物配置に取り入れられないかと考えた。
具体的には、細いエントランスアプローチを抜けると多く開けた裏庭スペースがドンッと表れる様な、歩いて楽しい共用空間の演出をベースに考えた。特に裏庭は既存では少し暗い印象があったため、人が入りやすいアプローチ（並木フェンスと飛び石状のタイル）、明度の高い波板を反射板的に手摺機能として配置する等して、カフェや店舗などの利用者が一息ついたり、イベント開催などがしやすい場所とした。
機能的には、建物最上部に大庇を追加し、廊下の雨掛かりを低減しつつ、雨水排水経路を適切に確保することで、躯体の耐久性向上や利便性向上を図った。また、既存の腐朽した手摺を層間の鉄骨柱に置き換え、手摺の強度を確保しつつ、大庇の構造としても兼用・合理化する計画とした。
This is a renovation project on the occasion of a change of ownership of a building complex for which no certificate of confirmation remains. The owner, who is also a bicycle racer, named the building 'RIM' in the initial stages of the project, with the hope that it would be a place that firmly supports the local area and its people, like 'RIM' (the name of the wheel of a bicycle).
TOKIWADAIRA, CHIBA Pref., where the project site is located, is an area with rich pedestrian space, crossed by rows of cherry blossom trees, selected as one of the '100 best roads in Japan', and rows of zelkova trees, selected as one of the '100 new Japanese roadside trees'. On the other hand, the existing building had a layout plan with a garden space at the rear, which is rarely seen recently.
The design concept was prepared to see if elements of this rich street environment could be incorporated into the characteristic existing building layout.
Specifically, the design was based on creating a communal space that is enjoyable to walk through, with surprised back-garden space that appears when you pass through the narrow entrance approach. In particular, as the existing back-garden had a slightly dark impression, we created a place where users of cafés and shops can take a break and hold events by creating an approach that is easy for people to enter. (tree-lined fence and stone tiles) High-luminosity corrugated plates makes brighten up back-garden and works as a handrail.
Functionally, a large eave is added at the top of the building to reduce rainfall in the corridor and to secure an appropriate rainwater drainage route, thereby improving the durability and convenience of the structure. The plan was also to replace the existing decaying handrail with steel columns between the layers, to ensure the strength of the handrail, while also rationalizing it as a large eaves structure.