24-04-2014, 02:25 PM
VERTICAL LIFT BRIDGE
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MOTIVATION
The motivation behind the project is the KATTWYK BRIDGE, HAMSBERG, GERMANY.
The bridge was built in 1972. The bridge has a unique feature that it based on the “Vertical Lift
Mechanism”, its middle (movable) part lifts to give way to the ship passing by thus maintaining
waterways transport. Till now no bridge such has been built in India.
ADVANTAGE OF MOVABLE BRIDGE
Movable A moveable bridge is a Bridge, that moves to allow passage (usually) for boats or
barges. An advantage of making bridges moveable is the lower price, due to the absence of
high piers and long approaches
ADVANTAGE OF VERTICAL LIFT BRIDGE
They cost less to build for longer moveable spans.
The counterweights in a vertical lift are required to be equal to the weight of the deck
whereas bascule bridge counterweights must weigh several times as much as the span
being lifted.
and so this type of bridge is especially suited for heavy railroad use.
[b]MECHANISM
[/b]
Movable portion of the bridge is connected to Counter weight on both end by Wire rope
passing over pulley, Pulleys are fixed on Bridge Supporting frame structure.
A water Tank is fixed below Movable portion of the bridge.
A small water pump to be fixed on Structure Below Bridge supporting Frame, Water
pump Inlet /outlet to tank will be common and to be connected with Pump discharge
throu Flexible Hose connection.
Bridge Supporting frame structure to be fixed on Foundation pillar projecting above
water surface of the river
In normal condition, Movable portion of the bridge is in Lowered position with filled water
tank and locked for Safety, thus Bridge is open to Road Traffic
When we want to lift bridge Up, We need to Unlock Safety Latch from Bridge, then drain
out the water from Water tank attached to Movable bridge, As Water is drained out,
Total weight movable part of bridge (with empty water tank) becomes lesser than total
weight of Counter weight, resulting Lifting up the Bridge,
Again to lower Bridge we need to pump water in water tank using small pump, Pumping
water in Tank attached to Movable bridge will increase total weight of Bridge and thus
bridge will start lowering down.
Refer attached sketch showing bridge in lowered and Lifted condition.
SAFETY FEATURE OF MODEL
Rubber Bumpers are placed below Lift structure to absorb any shocks during lowering of Bridge.
Safety latch used to lock the bridge in Position
When Bridge is in lifted position, Counter weight plate will act as barricade on Fixed part of bridge to
prevent any Road traffic.