Wednesday, August 17, 2011

New Zealand's Bridges: Groynes Footbridge in Christchurch (2)

March 2011 (-43.451 Degrees, 172.606 Degrees) Groynes Bridge

A groyne, according to a book on 'Bridge Scour' by Melville and Coleman, is a projection into a channel to reduce flow velocities through sedimentation. There is a rocky projection on the south bank of Otukaikino Stream just to the west of this bridge; perhaps to prevent scouring around the tower legs. 
Note the rectangular steel frame a little past the tower to keeps the cables in position. The ends of the cables are swaged into eye bars that are attached to fancy turnbuckles and connected to steel rings that are cast into the anchors. This is quite different than the cables on the suspension footbridges in Ecuador that were attached to the anchors by unravelling the ends of the cables and weaving them back further up the cable to form a loop.
Creative Commons License
New Zealand's Bridges: Groynes Footbridge in Christchurch (2) by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

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