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Model of Swing Bridge

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Swing Bridge- Newcastle

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The Swing Bridge in Newcastle is made from wood and stone however most swing bridges are made primarily from concrete and steel.

Concrete has a relatively high compressive strength and significantly lower tensile strength. Also used is reinforced concrete which is mixed with steel and rebar (mesh, spiral, bars and other forms)

Properties:
strength & durability
versatility
low maintenance
affordability

Steel has good tensile and yield strength, great formability and durability and is resistant to corrosion

Scots Pine and Mountain Pine were used on the Victoria Swing Bridge (Leith Docks)Wrought Iron was also used on the Victoria Swing Bridge. This is an iron alloy with a very low carbon content in contrast to cast iron. Wrought Iron is tough, malleable, ductile, corrosion-resistance and easily welded.

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https://wikipeda.org/wiki/Swing_bridge

Youtube - "Remembering the Ebey Slough Swing Bridge"

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-Puente de la mujer located in Argentina
-pymont bridge located in Sydney
-Kincardine bridge located in Scotland
-river tyne bridge located in Newcastle
- el ferdan railway bridge located in Egypt  is the longest swing bridge in the world at 640m
- memorial bridge located in Virginia is an example of a double swing bridge
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A swing bridge has a primary structural support called a vertical locating pin and a support ring. These are located usually at or near it's centre of gravity. This allows the bridge to rotate horizontally approximately 90degrees.
Swing bridges use hydraulic power to move. Electrically driven pumps feed the hydraulic accumulator which is a pressure storage reservoir, it works when pressure is applied by an external source which could be a spring, a raised weight or compressed gas. The hydraulic accumulator is sunk into the ground below the bridge and then water is released under pressure which runs the machinery to turn the bridge.

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Bridge bearings are components on a bridge.

They are usually located between the bridge pier and the bridge deck.

They allow controlled movement and reduce the stresses involved.

Bridge bearings transfer forces from the superstructure to the substructure.

They are made out of steel.

Bridge bearings allow for transational and rotational movements.

Different types of bearing:
Pin bearings
Rocker bearings
Roller bearings
Sliding bearings
Knuckle pinned bearings
Pot bearings
Elastomeric bearings

The first bridge bearings were made to support timber bridges and were just simple wooden blocks.

References:
www.bridge-bearings.co.uk

civildigital.com/types-functions-bearings-bridges

www.steelconstruction.info/Bridge_articulation_and_bearing_specification

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The oldest swing bridge still in operation is the Belize City Swing Bridge. The original wooden bridge was in operation from 1859 and it connected the north side of the City with the south side over the Belize River.  The bridge was replaced rebuilt as a swing bridge in 1922.  It was built to allow the passage of fishermen from the main harbor.  It was manually turned by men to allow the river traffic to pass twice a day. It went under major repairs in 1998.