*공중 브릿지 [ SOLID architecture ] Skywalk Rennweg 44-46

두건물을 공중에서 연결하는 브릿지는
단순히 건물을 연결하는 것 이상의 도시 스펙트럼을 담아
도시의 다양한 뷰를 관망할 수 있는 전망대로 재구성된다.
레인웨그 44번지와 46번지 두 건물을 연결하는 브릿지는
물리적인 22미터의 거리를 5층 높이에서 연결하는 이상의
확장성을 우리에게 보여준다.
특히 항공산업에서 사용되는 철골프레임의 접합방식은 
일반적인 건축구조양식에서 진보된 구조미를 보여 주며
투명한 글래스 튜브를 통하여 도시를 관찰할 수 있는 옵저베이션
역활 또한 수행한다.
 
우리나라에서 이와 같은 사례가 있는지 먼저 궁금하다.
일반적으로 공중에 통행이 되는 도로위에는 
어떠한 건축행위를 해서는 안돼는 것으로 알고 있는데
어떻게 할 수 있는지...
평범한 두개의 건축물이 한개의 브릿지로 색다른 장소성을
갖게 되는 신선한 프로젝트이다.

reviewed by SJ

 
SOLID architecture designed a bridge that is enclosed on all sides to connect the two buildings Rennweg 44 and 46 at the fifth upper floor, 17 metres above the Kleistgasse in the third district of Vienna. The bridge with a span length of 22 metres was completed in May 2009.

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Architecture

In reference to its outward appearance, the bridge adds a third and formally individual element to the two existing buildings dating back to the 1980ies. The fair grey metallic colour of the exterior surfaces of the bridge assimilates with the grey-green colour spectrum of the two already existing building structures.

Large-area glazed sidewalls make the supporting construction of the bridge, which is arranged inside, visible from the outside, and they make the bridge appear light and transparent.

The interior area of the bridge has its own individual character, independent of the two already existing buildings.

If you cross the bridge, you will experience space that is dominated by the dynamic alignments of the supporting construction and the bottom and top plate. There may also be made out a colour difference between the interior area of the bridge on the one and the existing building structure on the other side. With the exception of the fair grey floor, all surfaces are white.

Extending from the building Rennweg 46, there is created a horizontal plane into the road space, 17 metres above ground level of the Kleistgasse. From this horizontal area, there is presented a wonderful view onto the road space situated beyond and as far as the towers of the Arsenal. Following a bend in the botton plate, a slightly inclined ramp counterbalances the difference in height between the two building structures and leads into the building Rennweg 44.

The construction of the details is reduced and simply supports the view and the atmosphere and the effect of the space created.

Statical System of the Bridge

The main supporting structure of the bridge is formed by means of two supporter trusses spanned beyond.

The top chords of these trusses – welded hollow profiles with a lower flange projecting on one side – are integrated in the roof plane. The trussed beams consist of welded rectangular hollow steel tubes.

There are integrated welded I-beams as supports in the walking plane. These I-beams are suspended by means of tension rods from the main supporters, and they are attached to the supporter trusses of the main supporters in the bend of the bridge.

Roof and floor level are formed as horizontal latticed framework and transmit the horizontal load into the already existing buiding structures.

Geometry of the Bridge

From the buildings Rennweg 44 and Rennweg 46, there is extended a horizontal plane into the road space:
The bottom plate of the 5th upper floor Rennweg 46 as bottom plate of the bridge, the ceiling above the 5th upper floor Rennweg 44 as roof of the bridge.

The bottom plate with a 6% inclined ramp and the bridge roof with its inclined roof area extend over to the 1.04 m-offset level of the neighbouring building. The bends of the two levels – bottom plate and roof – are situated on top of each other.

In ground view, the bridge is tapering from 2.70m down to a width of 2.35m at the middle of the bridge.  In combination with the bends in the roof and the bottom plate there is created a bridge structure, which extends across the road space in a rather elegant way; furthermore, its interior area is clearly dominated by the perspective dynamics of the strongly aligned lines.

Illumination

The bridge is illuminated by means of two parallel light panels extending alongside the glass walls. These two light bands imitate the bends in the roof and the sidewalls.

+ Project credits / data

Project: Skywalk Rennweg 44 – 46
Location: Skywalk, Rennweg 44 – 46, 1030 Vienna
Purpose: Skywalk / Connecting Bridge between building Rennweg 44 and Rennweg 46

Architecture: SOLID architecture ZT GmbH | http://www.solid.ac/
Project Management: Arch. DI Christoph Hinterreitner
Collaborators: Arch DI Christine Horner
Client: Österreichische Lotterien GmbH
Structural Engineering: RWT PLUS ZT GmbH
Building Physics: RWT PLUS ZT GmbH
Construction Supervision: CF SER/IM/BPM der Österreichischen Lotterien

Contractors
Builder: SAN AS BAU
Steel / Glass Construction: Stahlbau Kamper GmbH
Plumber: Ing. Ledermüller GmbH
Electrician: Fleck Elektroinstallationen GmbH
Fire Protection Gate: Peneder Feuerschutz GmbH
Photographer of the Project: Günter Kresser
Holder of the Copyright: SOLID architecture ZT GmbH

Planning Data
Direct Commission: no, 1stprize in invited competition
Project Status: Project completed
Competition: July / September 2008
Start of Planning: October 2008
Start of Construction: April 2009
Completion: May 2009

Project Data
Gross Area: 54 m²
Built up Area: 54 m²
Useable Surface: 44 m²
Building Volume: 189 m²
Construction Costs: 40.000 € without bearing
Construction: Stahlkonstruktion, Seitenwände verglast
Spatial Program: Skywalk / Connecting Bridge

Awards, Prizes: Exhibition “Gebaut 2009“, Architektonische Begutachtungen der MA 19

from  plusmood