Hidden Arches PDF
Preview Hidden Arches
Hidden Arches - supporting public roads Unseen Assets. – infrastructural and heritage Gary Salter BE, MSc, C.Eng, MICE, MCIWEM, MIHT. Conservation Accredited Engineer Delivered to and at the request of TII/NRA National Roads Conference, Killarney, 23rd September 2015 23 9 2015 gsalter c NRA TII 1 Plan for talk • Significance of bridges • A glance at arch bridge history • Conservation not demolition is a win win scenario for LA’s, NRA, DoTTS and Society • Stone bridges form the vast bulk of Ireland’s road bridge stock (c75%) • Examples of arch bridge repairs in Sligo 23 9 2015 gsalter c NRA TII 2 Bridges are more than just physical structures. • Bridges link communities, peoples and even countries. • Bridges are often large and/or striking structures which are focal points both spatially and psychologically. • Whilst most of our old bridges are not huge or iconic, many are regionally or locally significant • It is no coincidence that arches dominate all the Euro Bank notes. 23 9 2015 gsalter c NRA TII 3 Bridges have many roles, some symbolic. Spanning the millennia. Joining together the EU nations The Romans were masters of masonry arch building. Pont du Gard, a world heritage site, celebrating it’s 2000th birthday in 20 years! 23 9 2015 gsalter c NRA TII 5 Court Cairn 23 9 2015 gsalter c NRA TII 6 Very early lintel bridging and corbelled arch/dome. Circa 5000 years ago 23 9 2015 gsalter c NRA TII 7 1800’s road bridge versions of post and lintol 23 9 2015 gsalter c NRA TII 8 s p a n d r e l Arch Bridge Components copings pilaster parapet String course Springing course capping extrados newel intrados voussoirs Wing wall (angled) Dressed base course abutment bed pitching 23 9 2015 gsalter c NRA TII 9 Arch Bridge Components II Parallel wingwall parapet extrados spandrel capping intrados keystone buttress Arch barrel Springing cutwater course cutwater pier 23 9 2015 gsalter c NRA TII 10
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