【威廉懷特小教室】之四十一。旋轉門

「好地方必須是方便進出的，但大多地方並不是」
旋轉門是常見的建築入口形式，但門本身並不旋轉，需要人力推動，需要相當的能量。有時甚至旋轉門之後有第二層的門，為了氣候控制而設計。這些門少數運作良好之時，是當有足夠的人大量出入，動態的人流與旋轉的門形成高效率的組合。會這樣，是因為大多數人在有選擇的地方，會跟隨一個開門的人。即使有很多門，多數時間大量的交通總還是集中在其中的一兩個。隨著人群變多，另外一扇門可能被打開，然後人與人之間的距離縮短。結論是：提供一個好的入口的方法是擁有足夠多的人群。

Revolving Doors
“A good place is an easy place to walk in and out. Most places are not.” Typically building entrances have revolving doors. They don’t revolve themselves; you have to revolve them. From a standing start this requires considerable foot-pounds of energy. As does opening swinging doors. And sometime there is a second set of doors 15 or 20 feet inside the first. According to engineers this is all necessary for climate control.

The only time they function well is when there are enough people so they can move faster and easily through the doors. The reason for this lies in the impulse to the open door. Most people are not natural door openers. Where there is a choice, they will follow someone who’s opening a door. Even when there are many doors, most of the time the bulk traffic will be self channelled through one or two of them. As the crowd swells an additional door will be opened, then another and the headway between people shortens.

Conclusion: one way to provide a good entrance is to have a big enough crowd.

圖片來源：https://www.nps.gov/wica/learn/news/images/Revolving-Door-with-Tour-low-res.jpg