The client came to us in early 2018, expecting to build a landmark multi-function architecture in a valley. The area of available land in the mountain is relatively larger, so it is freer to select the location. In this design, the selection of location and the deduction of architectural form were conducted simultaneously.
As an artificial thing was to be added to the undeveloped nature, "the form that dialogue with the site" was the biggest concern at the beginning of design. It was started with the strategy of "concealment", while we gradually approached to "theme-highlighted appearance” during the evolution of design.
Valley, stream and the seasonality of vegetation, as well as the changes of them in the natural light have their "beauty of being", which will not be increased or decreased by people. We believed that people's "reflection" on such kind of beauty was more valuable than "concealment" or "modification". Therefore, the purpose of our design was to use this architecture to express people's understanding of such "beauty of being" and to present it dramatically. This idea also coincided with the client's.
The theme "Bridge-pavilion" was soon determined, and the features of the architecture were also developed:
The architecture should span over the valley: point out the barrier of the valley to the access passage. Linear volume: demarcate an "absolute horizontal" reference in the undulant natural environment. Hipped roof: make the architecture more like a classical pavilion, thus having a sense of scale that can be grasped. Lightness and transparency: provide those who stay in the architecture with the viewpoints of "seeing and being seen". White: make the shape more abstract to contrast with the complex texture of the mountain and the large area of black pine forest covering the top of the mountain.
"Bridge" is a floating passage to get by, and “Pavilion" is a space to stay and serves as an observation point.
In order to make the completed Bridge-pavilion more like an abstract building with a hipped roof floating in the landscape, how to realize a 42-meter span without any trace and hide all the equipment and pipelines had become the focus of collaborative design of architecture, structure and equipment professions.
In the final structural plan, the steel-concrete composite system was selected. The piers on both sides are concrete columns with 1.2m x 2.5m section, and a beam with a width of 0.6m and a height of 2.2m is used as the main beam to realize the span. The core of the main beam is H-shaped steel wrapped with reinforced concrete. On both sides are a series of triangular overhung secondary beams perpendicular to the main one. The floor is suspended on the secondary beams through the tensile steel columns. In order to balance the bending moment in the middle of the main beam, a row of grounding tensile columns is placed at both outer sides of the piers.
The advantage of this structural system is that the main beam and all the equipment and pipelines can be concealed in the interior of the hipped roof, while only few tensile steel columns of small section will be exposed in the main space. In this way, the central hall on the middle bridge deck can be very transparent.
The indoor unit and air duct of the air conditioner are arranged in the gap between the secondary beams, while the outdoor unit is arranged in the equipment room at both ends of the volume. The exterior of the equipment room is covered with white perforated aluminum plates.
In order to reduce the visual size of the frame of the floor-to-ceiling windows, no openable window sash is set in the central hall, and the natural ventilation and smoke exhaust are realized by the skylight on the top that can be electrically opened.
Project name: Bridge-pavilion
Architecture Firm: SpaceStation
Completion Year: 2019
Gross Built Area: 500㎡
Project location: Design Valley, Wendeng District, Weihai, China
Project type：multifunction space
Lead Architects: LI Ling, WANG Zheng, LI Jiutai
Design Team: FENG Chen, LU Fang, XU Lili, LIAO Huiqin, DI Chenyang
Strategist: LI Jiutai
Site architect of Party A: SHI Hanyu
Structure design: WANG Duomin, MA Bin
Electrical Engineering: YAN Tianxiong
Water Supply and Drainage Engineering: ZHANG Sha
HVAC Engineering: WANG Daibing
Architectural Drawing: Weihai Architectual Design Institute Co. Ltd
Interior Drawing: YANG Mengmeng
Construction: Weihai Construction Group Co. Ltd
Client: Weihai Design Valley Co. Ltd