Anchored precision: Bridge over River Tweed, Aberdeenshire

Architect: Addison Conservation and Design

Image: Addison Conservation and Design

Anchored precision

Bridge over River Tweed, Scottish Borders

The new footbridge, designed by Addison Conservation and Design sits over the River Tweed. Guaranteed to be highly popular with cyclists and walkers alike, the bridge extends the Sustrans National Cycle Network between the towns of Peebles and Innerleithen, providing splendid views of the river and forested hills on either side of the valley.

The bridge which is designed for pedestrians and horseriders, cleverly combines timber, galvanized steel and a series of unique post tensioned Macalloy stabilisers which were designed to run parallel to the timber deck.

The bridge deck consists of 2 m wide by 100 mm thick timber planks, selected as a balance between weight and stability. The deck is supported by a fully galvanized steel structure to provide long term durability, with four overpainted raking pylons. Its main span is 55 m long at a height of 5.5 m above the river. The side (anchor) spans are 18 m each.

The reinforced concrete footings are anchored into the dense gravel substrate using driven-ground anchors. The anchors support the backstays and two post-tensioned Macalloy stabilisers which run longitudinally parallel to the deck and work with the Macalloy plan-bracing and stays to give lateral sway resistance and an ability to deal with flood driven river debris.

The galvanized Macalloy stabilisers are unique features which were also designed to assist stability during construction by being strung over first and tensioned. They also allowed the stays to be pretensioned ahead of the completion of the deck and carry the horizontal components of the stay forces, thus allowing the deck structure to expand and contract without affecting the stiffness of the supports.

The handrails are 1.4 m high to accommodate cyclists and horses. With more than 2,000 miles of cycleway in Scotland, the new bridge has helped to expand the network, providing huge benefit for visitors and communities along the route.

Order a Free Copy of the Hot Dip Galvanizing Magazine

Architect: Addison Conservation and Design

Image: Addison Conservation and Design

Posted on June 20, 2019 by Galvanizers Association

Read next…

Belize Civic Center

A multi-million-dollar civic centre constructed from prefabricated steel sections manufactured 5,000 miles away in Dorset, England has recently been completed in the heart of Belize City. Christchurch based REIDsteel has performed the structural design, detailing and fabrication, including the cladding…

Read more

EN 10348‑2:2018 – Galvanized reinforcing steel products

The implementation of a new standard for galvanized rebar will greatly enhance the performance of many concrete structures built across the UK and Ireland. The importance of correctly protecting steel reinforcement should not be under estimated. Steel reinforcement is used…

Read more

European Patent Office, The Hague

A dramatic, slimline glass block forms the new building for the European Patent Office (EPO) in Rijswijk near The Hague. Ateliers Jean Nouvel, Paris and Dam & Partners Architecten, Amsterdam collaborated to design the new building that rises from the…

Read more

Ringsend Container House, Dublin

The project represents an experiment in low cost, context-appropriate, family housing with the use of ISO shipping containers (seven in phase one – 90 m2 completed 2017, four in phase two – 40 m2 for 2018) facilitating growth over time.…

Read more