The Conveyor Bridge Design
Cable Bridge Conveyor is based on an improved simple suspension bridge design. This particular type of suspension bridge was first built in 1970s, now commonly used in hydropower dam construction to cross rivers.
The characteristics of the conveyor bridge design include:
♦ Bridge decks are directly mounted on tensioned steel cables.
♦ Unlike typical suspension bridge or cable-stayed bridge, no high towers are required.
♦ The improved design uses extended deck beam beyond center bridge deck, with stabilizing cables at both ends. This increases the torsional stiffness and dynamic stability against wind-induced vibration.
♦ Long span, quick construction and low cost.
♦ Estimated current installations > 50, with longest span >400m
Actually, the well-known London Millennium Footbridge (http://en.wikipedia.org/wiki/Millennium_Bridge,_London) uses a similar design.
London Millennium FootbridgeSpan: 370m
Bridge deck width: 4m
Cables: 8 x 120mm diameter steel cables
Other Examples of Improved Simple Suspension Bridge
Yellow River Bailang Bridge (1985 ~ 2003)
Sag ratio: 1/39
Load rating: Dead load 671 kg/m, Live load 3 x 40 tons, 150m spacing
Bridge deck width: 4m; Total width 14m
Cables: 76 x 38mm diameter steel cables @ safety factor 2.5