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On an arch bridge, the '''''capstone''''' or '''''topping stone''''' is a horizontal layer of stone or concrete supported by the arch and in turn supporting the road or rail bed of the bridge, or acting as a protective layer at the top of the ["headwall"]. On an arch bridge, the '''''capstone''''' or '''''topping stone''''' is a horizontal layer of stone or concrete supported by the arch and in turn supporting the road or rail bed of the bridge, or acting as a protective layer at the top of the [[headwall]].
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[http://www.holoscenes.com/images/bmwiki/bridge2.png] [[http://www.holoscenes.com/images/bmwiki/bridge2.png]]

On an arch bridge, the capstone or topping stone is a horizontal layer of stone or concrete supported by the arch and in turn supporting the road or rail bed of the bridge, or acting as a protective layer at the top of the headwall.

http://www.holoscenes.com/images/bmwiki/bridge2.png

topping stone (last edited 2009-03-22 11:16:46 by JimIrwin)