Pipeline Bridge Uses Timber Arches

An arch bridge is utilized for the purpose of providing a river crossing for a water supply pipe. Tidal influence, an unfavorable riverbed situation complicated by estuarial and other environmental considerations made a standard concrete-encased riverbed crossing difficult and expensive. An esthetically pleasing and economical solution is provided by an arch bridge with a 200 ft span and 16 ft rise. Two glued-laminated timber arches of 320 degree radius are placed on a stance 8 feet apart. A horizontal truss system is provided with timber struts and steel rod cross-bracing. Abutments consist of a glued-laminated pile cap, a concrete bearing pad and uplift piles.