On the afternoon of December 4, under the pull of the hoist and the full "escort" of the builders, the first main cable strand of the G3 Tongling Yangtze River Railway Bridge was erected, and the bridge officially entered the construction stage of the main cable erection。The steady progress of the main cable construction will lead to a firm "red line" for the subsequent suspension cable construction of the bridge.。

　 G3 Bridge is the world's first kilometer-level double-deck cable-suspension cooperative system bridge, the main cable for the main load-bearing components of the suspension bridge, suspension bridge "backbone" known。The G3 bridge consists of two main cables, each of which is anchored to the south and north respectively, connecting the south span, north span and main span of the bridge。Each main cable in the middle span is composed of 169 cable strands, the diameter of the main cable is 879 mm;Each main cable consists of 179 cable strands, the main cable diameter of 905 mm。Among them, the single strand is 1805 by 127.7 meters, diameter 5.4 mm galvanized aluminum alloy high strength steel wire with a standard strength of 2000 mpa。Two high-strength steel wire end to end of the main cable is about 80,000 kilometers long, can circle the earth about 2 times;Total weight up to 1.440,000 tons, equivalent to the weight of more than 280 high-speed rail cars。

　 How does such a heavy main cable fit？China Railway Bridge Bureau G3 Bridge branch, deputy chief engineer Zou Duan introduced，The main cable is constructed by prefabricated parallel strand method，"A number of wires are pre-combined into a parallel wire bundle with a regular hexagonal cross-section，Bind up parallel wire strands with fiber strength tape，Install anchor heads at both ends，The two-line reciprocating traction system was used for cable strand erection，After the erection of all rope strands，Then use the tightening machine to form all strands into one main cable，Become the main load-bearing structure of the bridge。Zou Duan introduced that in order to ensure the accuracy of the main cable shape, the vertical adjustment of the main span behind the main span of the cable strand will also be carried out, and no less than 3 days of linear observation will be required after the adjustment is completed。

　 On the waters of the Yangtze River, the main tower of the G3 Bridge is far away from each other, and the "red long dragon" composed of catways and cables will closely connect the north and south sides, and the bridge across the river is emerging, and the main cable is expected to be completed in early February 2024。