On April 26, the main bridge line A of luoanjiang river bridge was successfully closed and the east and west sides of the bridge were connected.It is reported that the bridge is the first application of the long-span full suspension without auxiliary technology in bridge construction in China.

Luo 'an river bridge is located at the intersection of xintian east road and luo 'an river, xinpu economic development zone, zunyi city, guizhou province.The main line of the bridge is designed as two-way six lanes, with variable section continuous steel box girder structure and ABCD four lines. The total construction length is 1220 meters.Among them, lines A and B are the main line Bridges, and lines C and D are the ramp Bridges.When the bridge is completed and opened to traffic, it will boost the development of local economy, culture and tourism.

According to the site engineer, luoan river is the drinking water source of zunyi city. In order to avoid the pollution of river water source caused by temporary buttress erection, the construction of the bridge adopts the whole cantilever erection process without auxiliary in the middle of the span.That is, the crawler crane works forward one segment at a time on the bridge deck. No temporary piers, supports or other auxiliary measures are set in the river below the bridge.

For the large span cantilever process at home without precedent, construction process, main backer has carried out the large span steel box girder across without auxiliary cantilever erection key technology research, scientific research project, solved the difficult problem dozens of construction technology, and formed the large span steel box girder highway across without auxiliary cantilever erection construction method ", declared "a steel box girder cantilever erection mobile hanging basket" patent, etc., for domestic large span without auxiliary gives reference to the cantilever type steel box girder construction technique.