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Manilla Railway Underbridges
The Manilla railway underbridges are two heritage-listed railway bridges located on the Tamworth-Barraba railway line in the town of Manilla in the Tamworth Regional Council local government area of New South Wales, Australia. The underbridges are owned by Transport Asset Holding Entity, an agency of the Government of New South Wales. The two sites were added to the New South Wales State Heritage Register on 2 April 1999. Description The bridges includes two structures, one located at Upper Manilla across the Borah Creek; and the other across the Oakey Creek. Bora Creek underbridge The Borah Creek Bridge is a Howe timber truss railway underbridge located at Upper Manilla across the Borah Creek, situated from Sydney Central station, erected in 1908. The bridge is seven spans in length, with the three central spans constructed with span Howe-Deck timber trusses. The trestles are supported on concrete sills. Opened in 1908, it has three timber truss spans and is a good e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barraba Railway Line
The Barraba branch railway line is a closed railway line in New South Wales, Australia. The line, which was opened on 21 September 1908,Barraba branch – NSWrail.net ran for north along the Manilla valley to the town of Barraba, New South Wales, Barraba from the Main North railway line, New South Wales, Main North railway line at West Tamworth, New South Wales, West Tamworth. The railway line crossed the Namoi River at Manilla, New South Wales, Manilla over a large viaduct and crosses the Peel River (New South Wales), Peel River just before Attunga, New South Wales, Attunga. Manilla railway underbridges, Two Howe timber truss bridges, one over Borah Creek in Upper Manilla (575 km from Central railway station, Sydney, Sydney Central) and the other over Oakey Creek between Manilla and Attunga (539 km), are heritage list ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Span (architecture)
Span is the distance between two intermediate supports for a structure, e.g. a beam (structure), beam or a bridge. A span can be closed by a solid beam or by a rope. The first kind is used for bridges, the second one for power lines, overhead telecommunication lines, some type of Antenna (radio), antennas or for aerial tramways. The span is a significant factor in finding the strength and size of a beam as it determines the maximum bending moment and Deflection (engineering), deflection. The maximum bending moment M_ and deflection \delta_in the pictured beam is found using: :M_ = \frac :\delta_ = \frac = \frac where :q = Uniformly distributed load :L = Length of the beam between two supports (span) :E = Modulus of elasticity :I = Area moment of inertia Note that the maximum bending moment and deflection occur midway between the two supports. From this it follows that if the span is doubled, the maximum moment (and with it the tensile stress, stress) will quadruple, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wooden Bridges In Australia
Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. It is an organic materiala natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin that resists compression. Wood is sometimes defined as only the secondary xylem in the stems of trees, or it is defined more broadly to include the same type of tissue elsewhere such as in the roots of trees or shrubs. In a living tree it performs a support function, enabling woody plants to grow large or to stand up by themselves. It also conveys water and nutrients between the leaves, other growing tissues, and the roots. Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or woodchips or fiber. Wood has been used for thousands of years for fuel, as a construction material, for making tools and weapons, furniture and paper. More recently it emerged as a feedstock for the production ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
