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Cable Bridge Conveyor, Llc YIJUN ZHANG, Ph.D, PE CABLE BRIDGE CONVEYOR, LLC. CONVEYOR DYNAMICS, INC. 1 CABLE BRIDGE CONVEYOR What Is It . Conventional trough or pipe conveyor supported by suspension bridge. The suspension bridge uses steel cables as main tension members to support loads. Span of 200m~600m between supports are typical; longer span is also possible depending on wind conditions. Suitable for crossing valleys, rivers, forests, structures and other difficult terrains, with minimal footprint and environmental impact. 2 CABLE BRIDGE CONVEYOR 3 CABLE BRIDGE CONVEYOR Conveyor on Suspension Bridge . Suspension bridges were built to support conveyors crossing Columbia river during hydropower dam construction in 1930s. 4 CABLE BRIDGE CONVEYOR Conveyor on Suspension Bridge . Similkameen ore conveyor bridge in BC, Canada, built in 1980. 404m span, 174m high truss tower; 1600 tph copper ore. 5 CABLE BRIDGE CONVEYOR RopeCon by DoppelMayr . Ropecon by DoppelMayr, a conveyor with a special flex wall belt. Instead of using idlers, Ropecon belt has fixed axles in belt with wheels moving on steel cables, 6 CABLE BRIDGE CONVEYOR Tacoma Narrow s Bridge . Old Tacoma Narrows Bridge is 850m long, 12m wide, steel girder construction, commissioned in 1940. 2nd order twisting motion at 0.2 Hz modal frequency, from wind vortex shedding. 7 CABLE BRIDGE CONVEYOR Limitation of Current Long Span Conveyor Solutions . Conventional suspension bridge requires high truss towers. Conventional suspension bridge uses arrow bridge deck that is close to the conveyor belt width. Weak torsional stiffness from narrow deck, prone to wind- induced dynamic instability. Ropecon from Doppelmayr is single-source supply and requires special belt, which is not compatible with conventional conveyor. Ropecon can’t accommodate horizontal curves. 8 CABLE BRIDGE CONVEYOR 9 CABLE BRIDGE CONVEYOR Improved Simple Suspension Bridge . Bridge decks are directly mounted on steel cables. Extended deck beam with stabilizing cables at the end. No high towers required. 10 CABLE BRIDGE CONVEYOR Improved Simple Suspension Bridge . Started in 1970s, now commonly used in hydropower dam construction to cross rivers. Long span, quick construction and low cost. Estimated >50 installations; longest span >400m 11 CABLE BRIDGE CONVEYOR Construction of Suspension Bridge 12 CABLE BRIDGE CONVEYOR London Millennium Bridge . The London Millennium Bridge uses a similar but not identical design. 13 CABLE BRIDGE CONVEYOR 14 CABLE BRIDGE CONVEYOR Cable Bridge Conveyor . Conventional trough or pipe conveyor is supported by simple suspension bridge. Conveyor belt line is in concave curve in the center, and convex curve near the support point. 15 CABLE BRIDGE CONVEYOR Cross Section View Stabilizing Cable Bridge Deck . Typical conveyor structure can be supported by the bridge 16 CABLE BRIDGE CONVEYOR Isotropic View . Conveyor structure is supported on deck beam. Deck beam supported by steel cables, with stabilizing cables at the two ends. 17 CABLE BRIDGE CONVEYOR Maintenance Vehicle Option Temporary walkway . Using modified ATV as maintenance vehicle to replace walkway can save structural cost and increase the efficiency of maintenance. Temporary walkway can be transported by the maintenance vehicle and installed on CBC if needed. 18 CABLE BRIDGE CONVEYOR Pipe Conveyor Option Temporary walkway . Tubular pipe conveyor with frame panel arrangement, is also compatible with Cable Bridge Conveyor 19 CABLE BRIDGE CONVEYOR Side View –Near Support Conveyor Belt line Bridge line . The conveyor belt line near support points is in convex curve. The convex curve is controlled by the leg height of the conveyor structure. The bridge cables can go over support with curve radius 35X ~ 40X cable diameter 20 CABLE BRIDGE CONVEYOR Side View –Center Conveyor Belt line Bridge line . The conveyor belt line in the center is concave curve, fitting closely to the bridge line. The arc lengths and radii of the convex and concave curve are related to the bridge line, which is also related to the span and sag. The belt radii are designed to control belt tension and safety factor. 21 CABLE BRIDGE CONVEYOR Versatility from Long Span . For CBC with 360m span and 40 sag ratio, transporting 2500T/H material, bridge structural weight is ~200kg/m or 134lb/ft. 22 CABLE BRIDGE CONVEYOR Finite Element Analysis . Finite Element Model is used to study displacement (left figure) and stress (right figure)in the bridge structure. 23 CABLE BRIDGE CONVEYOR Modal Analysis 2nd Mode Freq=0.55 1st Mode Freq=0.37 3rd Mode 4th Mode Freq=0.57 Freq=0.70 . Vibration Analysis is done to study the modal frequency of the bridge structure. Wind tunnel testing will be done during detail engineering stage. 24 CABLE BRIDGE CONVEYOR Summary . Cable Bridge Conveyor is a new type of bridge based, elevated, long span conveyor. Good solution for crossing rivers, valleys, structures. Minimal structural footprint to protect environment . The bridge design is a mature technology with >50 installations. Conventional trough and pipe conveyor can be used. Can accommodate horizontal curves. Licensing is available from Cable Bridge Conveyor, LLC. US and multinational patents pending. Overland conveyor design is available from Conveyor Dynamics, Inc. 25 Thank You CABLE BRIDGE CONVEYOR www.cablebridgeconveyor.com cbc@cablebridgeconveyor.com 1-866-771-2258 26.
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