The Helix Bridge, officially The Helix,
and previously known as the Double Helix Bridge, is a pedestrian
bridge
A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually somethi ...
linking
Marina Centre with
Marina South in the
Marina Bay area in
Singapore
Singapore (), officially the Republic of Singapore, is a sovereign island country and city-state in maritime Southeast Asia. It lies about one degree of latitude () north of the equator, off the southern tip of the Malay Peninsula, borde ...
. It was officially opened on 24 April 2010, however, only half was opened due to ongoing construction at the Marina Bay Sands.
[ The bridge was fully opened on 18 July. It is located beside the ]Benjamin Sheares Bridge
The Benjamin Sheares Bridge (; ms, Jambatan Benjamin Sheares; ta, பென்ஜமின் ஷியர்ஸ் பாலம்) is the longest bridge in Singapore, spanning 1.8 km, and the tallest, at .
It is named after Benjamin Sheares ...
and is accompanied by a vehicular bridge, known as the Bayfront Bridge.
Architecture
The design consortium is an international team comprising Australia
Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
n architects the Cox Architecture
Philip Sutton Cox (born 1 October 1939) is an Australian architect. Cox is the founding partner of Cox Architecture, one of the largest architectural practices in Australia.
He commenced his first practice with Ian McKay in 1962, and ...
and engineers Arup, and Singapore based Architects 61.
Canopies (made of fritted-glass and perforated steel mesh) are incorporated along parts of the inner spiral to provide shade for pedestrians. The bridge has four viewing platforms sited at strategic locations which provide views of the Singapore skyline and events taking place within Marina Bay. At night, the bridge will be illuminated by a series of lights that highlight the double-helix structure, thereby creating a special visual experience for the visitors.
Pairs of coloured letters c and g, as well as a and t on the bridge which are lit up at night in red and green represent cytosine
Cytosine () ( symbol C or Cyt) is one of the four nucleobases found in DNA and RNA, along with adenine, guanine, and thymine (uracil in RNA). It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an am ...
, guanine
Guanine () ( symbol G or Gua) is one of the four main nucleobases found in the nucleic acids DNA and RNA, the others being adenine, cytosine, and thymine (uracil in RNA). In DNA, guanine is paired with cytosine. The guanine nucleoside is called ...
, adenine
Adenine () ( symbol A or Ade) is a nucleobase (a purine derivative). It is one of the four nucleobases in the nucleic acid of DNA that are represented by the letters G–C–A–T. The three others are guanine, cytosine and thymine. Its derivati ...
and thymine
Thymine () ( symbol T or Thy) is one of the four nucleobases in the nucleic acid of DNA that are represented by the letters G–C–A–T. The others are adenine, guanine, and cytosine. Thymine is also known as 5-methyluracil, a pyrimidine nu ...
, the four bases of DNA. The intentional left handed DNA-like design, which is the opposite of normal DNA on earth, earned it a place in The Left Handed DNA Hall of Fame in 2010.
The Land Transport Authority
The Land Transport Authority (LTA) is a statutory board under the Ministry of Transport of the Government of Singapore.
History Incorporation of Land Transport Authority
Land Transport Authority (LTA) was established on 1 September 1995, f ...
claimed it is a world first in architectural and engineering bridge design. It won the 'World's Best Transport Building' award at the World Architecture Festival Awards in the same year. It has also been recognised by the Building and Construction Authority (BCA) at the BCA Design and Engineering Safety Excellence Awards in 2011.
Construction
The Helix is fabricated from approximately 650 tonnes of Duplex Stainless Steel and 1000 tonnes of carbon steel used in the temporary structure and also helping the bridge to get the helix shape. The construction began in 2007. It was officially opened on 24 April 2010 but partially accessible. The entire bridge was opened on 18 July 2010 to complete the entire walkway around Marina Bay.
Fabrication
Before any work began on the actual bridge, a mock-up was made of carbon steel to try and preempt certain difficulties. Fabrication of the elements worked from the North to the South, components being assembled into segments that could manage the Singapore roads. A trial assembly was done before delivery to site to identify any prefabrication errors.[The Institution of Engineers, Singapore. (August 2010). The Helx. The Singapore Engineer, pp. 8 - 17.]
Quality control
The duplex stainless steel used is susceptible to contamination by carbon or zinc dust. So a dedicated workshop was specially set up to keep members for the Helix separate from other carbon and nitrogen steels.
Temporary works
A temporary truss bridge was built to support the bridge and provide access. The key issue was in launching the trusses over the central 50m wide navigation channel that had to be kept clear during construction to give safe access to other users of the bay.
The truss was launched in segments in a synchronised lift with two mobile crane units. This was done at night to minimise disturbance caused by closing the channel.
Permanent works
A mobile gantry crane was positioned on the temporary bridge to lift elements into place. Erection started from the North Abutment starting with the horizontal prefabricated segments (av. 11m long). Then the horizontal deck components were bolted on, and then cross members, hoop members, tension rods, and other loose members were installed working upwards from deck level.
The helices and their struts were installed. The individual elements of the helices being welded on the entire span had been erected. These crucial connections were very closely supervised and controlled to ensure the properties of the duplex steel were maintained. Finally a passivation process removed any surface iron compounds which are a potential source of corrosion.
In popular culture
The bridge is featured in HBO
Home Box Office (HBO) is an American premium television network, which is the flagship property of namesake parent subsidiary Home Box Office, Inc., itself a unit owned by Warner Bros. Discovery. The overall Home Box Office business unit is ba ...
series Westworld, as part of the third season.
References
External links
360° Interactive VR image of the Helix Bridge
{{DEFAULTSORT:Helix Bridge
Bridges in Singapore
Tourist attractions in Singapore
Downtown Core (Singapore)
Marina Bay, Singapore
2010 establishments in Singapore
Philip Cox buildings
Bridges completed in 2010