Bowen Bridge

Template:Short description Template:For Template:Use Australian English Template:Use dmy dates Template:Main other{{#invoke:Infobox|infobox}}Template:Template other{{#invoke:Check for unknown parameters|check|unknown=Template:Main other|preview=Page using Template:Infobox bridge with unknown parameter "_VALUE_"|ignoreblank = 1| also_known_as | alt | aqueduct_name | architect | begin | below | bridge_name | builder | built | capacity | caption | carries | child | clearance | clearance_above | clearance_below | closed | collapsed | demolished | complete | contracted_designer | coord_format | coordinates | cost | crosses | dedicated | depth | design | designer | destroyed | diameter | downstream | electrification | embed | embedded | ends | engineering | extra | fabricator | fetchwikidata |first_length | first_diameter | followed | gauge | height | heritage | id | id_type | image | image_caption | image_size | image_upright | inaugurated | lanes | length | life | load | locale | location | mainspan | maint | maintained | mapframe | mapframe-caption | mapframe-custom | mapframe-id | mapframe-coord | mapframe-wikidata | mapframe-point | mapframe-shape | mapframe-frame-width | mapframe-frame-height | mapframe-shape-fill | mapframe-shape-fill-opacity | mapframe-stroke-color | mapframe-stroke-colour | mapframe-stroke-width | mapframe-marker | mapframe-marker-color | mapframe-marker-colour | mapframe-geomask | mapframe-geomask-stroke-color | mapframe-geomask-stroke-colour | mapframe-geomask-stroke-width | mapframe-geomask-fill | mapframe-geomask-fill-opacity | mapframe-zoom | mapframe-length_km | mapframe-length_mi | mapframe-area_km2 | mapframe-area_mi2 | mapframe-frame-coordinates | mapframe-frame-coord | mapframe-switcher | material | material1 | material2 | name | named_for | native_name | native_name_lang | notrack | num_track | number_spans | official_name | onlysourced | open | opened | opening | os_grid_reference | other_name | owner | passable | piers_in_water | pierswater | preceded | qid | rebuilt | references | refs | replaced_by | replaces | second_length | second_diameter | spans | starts | structure_gauge | third_length | third_diameter | toll | towpath | track_gauge | traffic | traversable | upstream | website | width | winner }}Template:Main other The Bowen Bridge is a segmental cantilever road bridge crossing the River Derwent in Tasmania, Australia. The bridge serves as a vital transportation link in the state capital of Hobart, facilitating the movement of vehicles, pedestrians, and cyclists between the local government areas of Clarence on the eastern shore and Glenorchy on the western shore. The Bowen Bridge links the East Derwent Highway with the Brooker Highway (as Goodwood Road) at Glenorchy, approximately Template:Convert from the Hobart city centre.

The Bowen Bridge is composed of eight river spans, each measuring Template:Convert. The end spans are Template:Convert and Template:Convert long. It maintains a consistent deck width of Template:Convert, accommodating a Template:Convert divided highway with two lanes each, along with two separated shared-use walkways.<ref name="leighton" />

The Bowen Bridge takes its name from British colonist John Bowen, who founded the first European settlement in Tasmania (then Van Diemen's Land) at Risdon Cove on the eastern shore. Bowen subsequently moved the colony to the western side of the River Derwent, where the Hobart city centre is located today.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Prime Minister Malcolm Fraser revealed the bridge's name at a public ceremony at Dowsings Point on 10 October 1980.Template:Sfn

History

Situated approximately halfway between the Tasman Bridge and the Bridgewater Bridge, the Bowen Bridge was constructed to mitigate any future failure of the city's bridges following the Tasman Bridge disaster. The State and Federal Governments established the Joint Committee in November 1975 to oversee the design and construction of a bridge across the River Derwent near Dowsings Point.Template:Sfn Maunsell and Partners served as consulting engineers and Leighton-Candac, awarded the contract in 1980, completed the construction.Template:Sfn<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="Freight page 5">Second Hobart bridge contract awarded Freight & Container Transportation July 1980 page 5</ref>

Design

The foundational design primarily aimed to ensure the river piers could withstand impacts from barges traveling at operating speeds (Template:Convert) assisted by the current (Template:Convert). All piers were specifically engineered to endure an impact force of Template:Convert at an angle of up to 45 degrees from the pile cap centre line, while other directions could sustain a force of Template:Convert. This approach accounted for potential impact from future river barges of up to Template:Convert of deadweight tonnage. The underlying philosophy involved creating substantial gravity-based foundation structures capable of generating adequate force to absorb the energy and deform the bows of barges during impact.<ref name="leighton" />

The design strategy also allowed for future reinforcement to withstand a force of Template:Convert, accommodating potential deadweight tonnage impact of Template:Convert. To meet these ship impact criteria, the river pier foundations were constructed as massive reinforced concrete caisson structures, measuring Template:Convert in outer diameter with Template:Convert wall thickness, built from the ground up.<ref name="leighton" />

The deepest among the nine piers extended to Template:Convert below mean sea level. Noteworthy statistics include a total concrete mass of Template:Convert, a reinforcing steel mass of Template:Convert, and a cumulative length of steel tendons reaching Template:Convert.<ref name="leighton" />Template:Sfn

Construction

Leighton Contractors implemented a highly efficient balanced cantilever construction technique, notably avoiding the use of falsework within the river – a pioneering approach in Australia at that time.<ref name="leighton" /> To streamline the construction process, segments were match cast, enabling the deck to be constructed concurrently with the establishment of substantial foundations. This segmental design facilitated swift assembly of the superstructure. The superstructure itself consists of two individual box girders that were erected side by side and connected by an in situ longitudinal joint. The segments were cast in the sequence of their installation. Subsequent segments were directly cast against preceding adjacent segments, utilising a debonding agent on the adjacent surface to allow for separation.<ref name="leighton" /><ref name="Freight page 5"/>

The bridge cost Template:AUD49 million to construct and was officially opened on 23 February 1984 by Prime Minister Bob Hawke.<ref>Hobart Electric Traction May 1984 page 93</ref><ref>Template:Citation</ref>

Gallery

• Bowen Bridge.jpg

  The bridge from the Derwent River (facing south).

Sources

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External links

• History