1. The Prussian "customs union" industrial zone, located in the North Rhine Westfalen zone, completely retains the infrastructure of coal mines in history, and some 20th century buildings there also show outstanding architectural values. The landscape of the industrial zone has witnessed the rise and decline of the coal mining industry, which used to be the local pillar industry in the past 150 years. The customs union coal mining industrial zone was once the largest, most efficient and most modern coal mining base in the world. At the same time, because of its simple appearance and practical "Bauhaus" style, it was known as the most modern and beautiful coal mine building complex in the world at that time.

2. It is planned to develop 17 cities in the traditional industrial zone into a coherent "ecological landscape park": retain industrial buildings as historic sites, transform the heavily polluted Rhine Hearn canal into a "living space", and transform the land in the past industrial zone into a modern science park, industrial development park and related service industrial Park, The renewal and modernization of new houses and old houses will drive the renewal of small-scale urban areas, and create new cultural activities to drive local activation.

3. The reconstructed industrial area is divided into three areas a, B and C. These three landscape sites bear their own functions and are orderly connected together to form an organic chain of industrial landscape. Among them, A District: where the essence of building is in the entire coal mining area, Norman, Forster, the famous architect of the UK, chaired the original boiler room into a famous red dot design museum. Area B: it provides local people to live and work in peace and contentment, including a kindergarten, a ceramic workshop and mining area office. It is the main building here. Zone C: it is reconstructed from the original coking plant and gathers many recreational facilities.

4. The predecessor of the red dot design museum is the boiler room in the industrial zone. The architectural transformation and design skillfully combine the old mine facilities with the new exhibition space, and effectively combine the slightly rusty and corroded original mine facilities and the old buildings with the new architectural space, so as to create an architectural language with both classical and contemporary feeling. Through the reorganization and function replacement of the original space, the large "U" factory building with only two floors in appearance is transformed into a five storey functional space. In the exhibition hall, the original tall steel frame structure of boiler equipment is retained, and the surrounding walls are covered with transmission pipes and giant exposed steel skeleton, with red rust spots on the surface.

5. Ruhr museum is located in a reconstructed coal washing plant. The strategy adopted by Koolhaas in the reconstruction design is to use the old building as a mold, increase the spatial performance without changing the architectural state, and form a strong visual effect through the decoration of the building skin and the combination and construction of the building space. There is a large square in front of the exhibition hall. After planning, it has become a very good distribution center. In front of the main entrance, there is a glass ceiling orange escalator tens of meters long, which goes directly to the fifth floor space. The historical red brick facing of the exhibition hall is superimposed with the transparent sightseeing escalator with the characteristics of the times, forming a sharp contrast between "new" and "old" in form.

6. Located at the entrance of the landscape site in area a, the twin axis tower is in the shape of a human house, about tens of meters high. It spans a 5-storey and 6-storey building. There is a steel frame stair pan at the bottom of the tower and rises to the top. The tower used to be the winch derrick of the coal mine. At present, four mechanical runners are still reserved on the tower, which are symmetrically distributed on the top of the tower. The U-shaped main steel frame structure and L-shaped steel structure supports are combined into a rhythmic steel frame structure system, which constitutes a unique landscape form and landscape sign.

7. Case summary: industrial site reconstruction projects such as Ruhr district in Germany can: start from the industrial attribute itself, develop a tourism industry with characteristic advantages and bring popular consumption; The creative industry with heritage characteristics is suitable for the regional space for the gathering of creative talents; Combine with local culture, take root in local life and improve the spatial quality of local cities and towns.

[1]https://mp.weixin.qq.com/s/W4vA1YX8IFg7FvmWBn3RlA

[2]https://www.sohu.com/a/197844075_201359

[3]https://www.metalocus.es/en/news/walled-city-zollverein-oma