Construction World December 2021

PROJECT INFORMATION

• Company entering: Sika South Africa for AECOM • Main Contractor: Haw & Inglis Civil Engineering • Client: Western Cape Government, Department Transport & Public Works, Roads Branch • Temporary Works Designer: Mafeiss Engineering • Launch System Designer: Nyeleti Consulting • Concrete Supplier: Afrimat • Specialist Product Supplier: Sika South Africa • Consulting Engineer: AECOM • Scaffolding: Formscaff • Subcontractor: Amsteel • Subcontractor: Allweld Marine & Industrial

stabi l i ty to the arch ribs , post-tens ioned t ie-beams complete the arch structural form. • Post-tens ioned t ie-beams complete the arch structural form. • Post-tens ioned longi tudinal and transverse beams support the integral deck road slab and transfers load to the t ie-beam. • Twenty- four ful ly locked coi l strand-type hangers connect the arch rib and t ie-beam by cast steel fork sockets , to welded metal anchor plates fixed wi th strength stress bars . Structural modelling for design and construction State-of-the-art bridge analys i s sof tware packages were used by AECOM’s complex bridge special i sts for

largely el iminated the poss ibi l i ty of debri s bui ld up and provided the shal lowest deck depth opt ion (key cons iderat ions) . Construct ion adjacent to exi st ing bridge and transverse launching af ter complet ion minimi zed traf fic di srupt ion during construct ion. Design considerations related to the concrete tied-arch The New Ashton Arch has a s ingle t ied-arch structural configurat ion, wi th a span of 110 metres between support bearings . The typical cross -sect ion of the arch bridge deck provides for four 3,4 m traf fic lanes and two 2,4 m s idewalks . • The overal l height of the bridge i s 23 m. • The twin paral lel arch ribs are connected via five 15,5 m wi shbone beams that provide lateral

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20 th Best Project Awards 2021