❚ 大堂：利用體塊穿插，營造區域標誌

酒店大堂是新建，它位於四棟客房建築與西餐廳中間，起到了公共區域和私密區域阻隔和轉換的作用。建築分為兩層，由四個建築體塊互相穿插構成。首層為酒店大堂，包含前台，休息等待區等功能，通過橙色的酒廊，大堂空間與西餐廳的三層相連。二層則是環形展廳，可以舉辦活動和展覽。從一層到二層除了可以走室內樓梯，也可以使用室外的大階梯。

在建築師看來，新建大堂應該成為新 809 的地標。它需要被從遠處清晰的捕捉到，並吸引客人進入新 809 區域。為了達到這個目的，建築被刻意設計的具有視覺張力：超尺度的幾何體塊相互穿插，不同材料和強烈顏色的對撞，形成了不同於日常生活的視覺與感官體驗。一層大堂不規則的形式既與場地地形有關，又避讓了空間中原有的樹木。二層的環形展廳採用全玻璃幕牆，它「飛架」在一層之上，為使用者提供了 360 度的觀景面。彎折的酒廊，南側插入西餐廳建築體塊中，北側挑出於混凝土陡坎之上，形成強烈動勢，其標高與西餐廳三樓的早餐廳一致，起到了連接大堂及早餐廳的交通功能。酒廊外皮由橙色的金屬網覆蓋，室內也同樣被橙色覆蓋，強調了建築體塊的同時也顛覆著使用者的感官。斜向的室外大樓梯被深褐色的金屬表皮包裹，成為一個斜插向天空的方筒，表皮上的圓孔讓內部形成豐富的光影效果，營造了一種「不真實」感。這一切都與原 809 廠的老三線風格不一樣，新老建築形成了強烈的視覺對沖，但正是因為這種對沖，讓舊者更舊，新者更新。

為了實現大堂建築特殊的形態，建築師與結構工程師付出了巨大的努力。建築整體採用鋼結構，為了得到一個盡量通透的環形展廊，並保證一層建築室內的舒適性，環形展廳的由三組巨型鋼柱支撐，它們呈 120 度排布，分別隱藏在大堂的服務型空間和酒廊空間內，從室外無法察覺。環形展廳由 9 組鋼柱支撐，它如同一個環形「盒子」放置在一層結構上。斜向的大階梯及包裹它的筒則如同一根巨大的方柱斜插於圓環中，起到了不同高程的交通聯繫。四個建築體塊看似相互倚靠堆疊，實則結構相互獨立，自成系統，這樣的處理保證了建築結構的安全性。場地複雜的高差、不確定的地質條件（喀斯特地貌），毗鄰的老建築基礎的避讓和場地內原始樹木的保留等問題都給項目實施過程帶來了巨大的挑戰，建築師、結構工程師及施工單位面臨並一一克服這些問題，最終完成了建築複雜形體的建造及表達。

❚ Lobby: using body blocks to create regional signs

The lobby of the hotel is newly built. It is located between the four guest buildings and the western restaurant, which acts as a barrier and transformation between public areas and private areas. The building is divided into two layers, which are composed of four building blocks interpenetrating with each other. The first floor is the lobby of the hotel, including the functions of front desk, waiting area and so on. Through the orange lounge, the lobby space is connected with the third floor of the western restaurant. On the second floor is the circular exhibition hall, where activities and exhibitions can be held. From the first floor to the second floor, you can not only take the indoor stairs, but also use the outdoor large stairs.

According to architects, the new lobby should be the landmark of the new 809. It needs to be clearly captured from a distance and attract guests into the new 809 area. In order to achieve this goal, the architecture is deliberately designed with visual tension: super scale geometric blocks interpenetrate with each other, different materials and strong colors collide, forming a visual and sensory experience different from daily life. The irregular form of the first floor lobby is not only related to the site topography, but also avoids the original trees in the space. The circular exhibition hall on the second floor adopts the full glass curtain wall, which is "flying" over the first floor, providing users with a 360 degree view. The crooked lounge is inserted into the building block of the western restaurant in the south, and lifted from the concrete steep ridge in the north, forming a strong momentum. Its elevation is the same as that of the western restaurant on the third floor, which plays the traffic function of connecting the lobby and the early restaurant. The outer skin of the lounge is covered with orange metal mesh, and the interior is also covered with orange, which emphasizes the building block and subverts the user's senses. The slanting outdoor staircase is wrapped by dark brown metal skin, which becomes a square tube leading into the sky. The round holes on the skin endow the interior with rich light and shadow effects, creating a sense of "unreality". All these are different from the old third-front style of the original 809 factory. The new and old buildings form a strong visual hedge, but it is precisely because of this hedge that the old ones are older and the new ones are newer.

In order to realize the special form of lobby architecture, architects and structural engineers have made great efforts. The whole building is of steel structure. In order to get a transparent circular exhibition gallery as much as possible and ensure the indoor comfort of the first floor building, the circular exhibition hall is supported by three groups of giant steel columns, which are arranged at 120 degrees, hidden in the service-oriented space and the lounge space of the lobby respectively, and cannot be detected from the outside. The circular exhibition hall is supported by 9 sets of steel columns, which is placed on the first floor like a circular "box". The oblique large ladder and the tube surrounding it are like a huge square column which is inserted in the ring obliquely, playing a traffic connection of different elevations. The four building blocks seem to rely on each other for stacking, but in fact, the structure is independent and self-contained, which ensures the safety of the building structure. The complex height difference, uncertain geological conditions (karst landform), the avoidance of the adjacent old building foundation and the reservation of the original trees in the site all brought great challenges to the project implementation process. Architects, structural engineers and construction units faced and overcome these problems one by one, and finally completed the construction and expression of the complex building shape.