Wednesday, December 9, 2015

News: Macalloy continues to span the globe


Super strength stainless steel bars manufactured by Macalloy in Rotherham are being used to create the railway bridge with the largest reinforced concrete arch span in the world.

Dinnington-based Macalloy are world leaders in design, manufacture and supply of threaded bar and cable systems to engineering and construction projects across the globe. Approximately 80% of the company's turnover is from export.

Work is well underway to build Spain's 996m long Almonte Viaduct to carry the AVE high speed railway over the Alcantara reservoir, on the Madrid to Extremadura route. The bridge, designed by Spanish engineering firm Arenas y Asociados, is part of a high-speed rail line proposed to connect the two European capitals of Madrid, Spain and Lisbon, Portugal.

Once complete, the bridge will also be the largest high-speed railway arch bridge and third largest concrete arch bridge in the world.

Macalloy 1030 bars in 75mm and 40mm have been used as part of the anchorage system to anchor/tension the stay cables which provide provisional support to the arch of Almonte Bridge.

FCC are constructing the bridge using eight groups of stay cables – four for pulling and four for retaining operations – all are assembled on the ground and lifted into position using cranes. Before the segments of the arch are concreted, the stay cables are stressed in a synchronised sequence, applying force to the pulling and retaining cables at the same time.

Macalloy bars have also been used to create the "Solhjulet" (Sun-wheel) sculpture in Denmark, a 12 m high wheel located an the centre of a roundabout in Give.

Designed by artist Bo Karberg, it is now the new symbol of the town having opened earlier this year. The outer ring is made of steel, covered with a fibreglass shell, and the inner grid consists of prestressed Macalloy 460 Stainless Steel bars. Glass plates are integrated into the grid structure, similar to the glass pyramid of the Louvre in Paris.

It is inspired by 5,000 year old disc wheels from the late Neolithic period, which were found in Pilkmosen near Give in 1948. They are now classified as the oldest known wheel, and is on display at the National Museum.

Macalloy website

Images: FCC /


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