The four pylons were formed out of concrete and each house one of the four counterweights that balance the bridge. he span support machinery comprises the counterweight ropes, counterweight sheaves and bearings and the counterweights. The span weight is approximately 2720 tonnes (tram-train phase) and is balanced at the four corners of the lift span by the counterweights. The counterweights are comprised of a central spine plate and four quadrant boxes. Each quadrant box is filled with steel ingots specially cast for the interior shape of the quadrant boxes. The ingots are sized to provide the necessary balance with adjustment for final balancing and any future modifications..
A total of four counterweights, each weighing about 50 tonnes, are required to balance the lift span
Digitally controlled variable speed motor drives were used for the span drive system.
positioning of electrical components in machine rooms 25 m above the water level enclosures for mechanical machinery and components
positioning of mechanica components in machine rooms 25 m above thewater level
Two box beams (lift beams) support the longitudinal box girders at the ends of the lift span and are used to lift the span during operation with the use of 32 - 38mm diameter wire ropes. The ropes are supported on 3.0m sheaves and are connected to counterweights within the tower. A total of four counterweights, each weighing about 50 tonnes, are required to balance the lift span.
The operating machinery is traditional in layout and is mounted in the lower level of the concrete plinth on which the two pylons are founded. The machinery includes two electric drive motors (A and B motors) connected to a primary reducer and a secondary reducer
The span operating machinery utilizes a two-way operating rope system with uphaul ropes connected to the bottom of the counterweight. The downhaul ropes extend from the operating drum over a deflector sheave at the pylon top and connect to the top of the individual counterweights
Varies, Top pylon, and at concrete plinth