장대한 드라마틱한 시퀀스를 연출하는 캐노피의 오가닉한 형상은 도시를 대표하는 아이콘으로 역사;철도와 버스를 연계, 환승하는 인프라스트럭쳐로 제안된다. 스위스 아라우시의 새로운 명물인 캐노피는 탑승객들의 안전한 환승을 도모하는 쉘터로 외부환경; 눈, 비, 바람, 태양으로 부터 보호한다. 오가닉한 형상은 이용자들의 동선과 태양의 일주가 반영된 결과물로 건축적 조형미와 기능공간을 확보한다. 특히 캐노피의 외피를 담당하는 막구조는 블루 컬러의 버블형상 패턴과 내부공간을 지지하는 하지재의 드라마틱한 결합으로 거대한 구름을 형상화하며 캐노피를 도시의 랜드마크로 발전시킨다.
reviewed by SJ
Recently, the Swiss city of Aarau, a cantonal capital, has gained its
own cloud in the shape of an organically formed bus station canopy with a
reflective and semi-translucent skin. The roof hovers, so to speak,
above the forecourt of the railway station. However, unlike its
meteorological namesake, this cloud provides protection from the rain
and snow.
Architects: Vehovar & Jauslin Architektur
Location: Aarau, Switzerland
Area: 1070.0 sqm
Year: 2014
Photographs: Niklaus Spoerri
Structural Planning: formTL
Planning And Civil Engineering: suisseplan Ingenieure AG
Lighting: Atelier Derrer
Executing Firms: Membrane roof consortium comprising Ruch AG Altdorf, Switzerland and Vector Foiltec GmbH, Bremen, Germany
As part of the construction of Theo Hotz’s new railway station in Aarau,
the station forecourt and bus station have been given a new face.
Existing fixtures have been removed and the underground car park
relocated so that the bus stops can now all be accommodated within
Bahnhofplatz. Mateja Vehovar and Stefan Jauslin have designed a bus
station canopy which looks as light as a feather, with the idea of
creating a haven of calm between the busy Bahnhofstrasse and the new
railway station. This has created a welcoming zone for commuters
transferring between the Swiss Federal Railways and Aarau’s regional
buses, and a hangout for night owls which radiates metropolitan flair.
At the centre of the air-cushioned membrane canopy is an organically
shaped opening. The contrast between the semi-transparent surface and
the open air intensifies the impression of lightness and the feeling of
being out in the open, yet essentially protected from the elements. This
impression has been encouraged by a series of strategic decisions: the
use of a translucent membrane, both clear and blue-dyed, with a finely
balanced print (by Stefan Jauslin with Paolo Monaco), the supports with
their slight slant towards one axis which disappear into the cushion and
carry the “cloud”, the varying distances between the membranes and the
support structure inside, a technical infrastructure fully integrated
into the steel construction carrying water, air, electrical and sensor
technology, as well as the irregular network of stainless steel cables
below the cushion which is designed to give the membrane the required
span. These multiple amorphous membrane bays break up the overall shape.
They provide the numerous reflections and plays of light on the
membrane skin, triggered by the linear luminaires arranged in line with
the supports. The internal supporting structure is faintly discernible.
Viewed obliquely, the supports fade into the background and the canopy
gains volume.
Regardless of how light and simple the cloud appears, its design
necessitated a skilled team of planners good at communicating, and close
coordination of all the parties involved. For this reason, the
architects Vehovar & Jauslin Architektur brought in formTL at an
early stage as a specialist to deal with the support structure and
membrane skin. formTL had a particular interest in ensuring that the
design provided by Vehovar & Jauslin Architektur AG would be
feasible, and in bringing out its lightness and filigree nature. This
was achieved by basing the planning and realisation on three factors:
the planning team directed by suisseplan consistently pursued the aim of
building the most airtight cushion with the most economical form of
operation. The consortium entrusted with the membrane cushion now
consisted of committed specialist firms. Moreover, formTL was given full
control of the structural planning, integration with the building
services engineers, invitation to tender, management of specialist
construction work and quality control.
By fastening the three-part upper and lower membranes to the curved
outside tubing separately, it was possible to achieve the simple and
structurally clean detailing of the cloud. With 1070 m² of covered area
and a volume of 1810 m³, the roof of the bus station is the world’s
largest single-chamber membrane air cushion. Four 120-metre long
polyethylene tubes under the road supply the pneumatic air cushion with
recirculated clean, dry air, and another four tubes take the air back to
the air control unit. Depending on the weather, the entire system
comprising support air system, tubing and membrane cushion is maintained
by sensors at 300 – 850 pascals above the outside air pressure. As only
the moisture has to be removed that is diffused over the 2140 m²
cushion surface, and both the cushion and the tubing are more or less
airtight, the roof is highly economical to operate.
Immediately after it was commissioned, the bus station canopy was included as an exhibit at the “architektur 0.13″ exhibition held in Zurich. Between 26 April and 27 July 2014 the bus station roof can be seen at the exhibition entitled “Bauen mit Luft” (Building with Air) to be held in conjunction with a 10-year retrospective of formTL at the Air Museum in Amberg, Germany.
from archdaily