At 9:00 on July 30, with the safety of the last steel box beam, the key project of the expansion of the Third Ring Road in Chengdu – the complete project of the Yangxi Interchange, the main structure was smoothly completed.

At the scene, Tian Yonghui, the person in charge of the construction party, told the reporter that the project applied prefabricated bridge piers for the first time in the southwest region. The steel box girder of the project also adopted prefabricated assembly technology. After completion, seven new ramps will be added to realize four directions. Fully interoperable, and strive to open to traffic at the end of August, and return to the people.

On February 4 this year, the Yangxi Interchange Complete Reconstruction Project welcomed the first prefabricated pier of the prefabricated pier. It is reported that this is the first application of prefabricated piers in the southwest.

Due to the long transport length and wide width of the ex-factory components of the steel box girder, the assembly precision of the steel box girder is high, the number of sections is large, the workshop and the site need to be assembled, and the welding capacity of the factory and the site is large. Strictly control the quality, the whole workshop is pre-assembled, and the perforated connection positioning gussets that are convenient for the construction site are set up. The transportation and assembly must be carried out in strict accordance with the construction plan to prevent the deformation of the steel box girder.

The above structures of the sheep and the ramie are all prefabricated and assembled. The piers and steel beams are uniformly assembled in the prefabricated yard and assembled on site by using “building blocks” construction technology.

"At present, these bridges are installed for 12 days according to the traditional construction, and it takes only half a day to adopt the new technology." Tian Yonghui said that in the complete reconstruction project of the Yangxi interchange, a total of 110 piers were installed with this technology.

"Before it was semi-interoperable, after the opening of the vehicle at the end of August, it will achieve full interoperability in all four directions." Tian Yonghui introduced. The Yangxu Interchange Comprehensive Reconstruction Project will add six bypass lanes and a distribution lane. Upon completion, it will greatly enhance the capacity of the Third Ring Road to transform, drive the construction and development of the commercial circle around the Third Ring Road, and improve the traffic pressure in Chengdu West.

Among the seven new ramps, there are four ramps for right turn, two ramps for left turn, and one forglow lanes. The standard width of the ramp is 9m, the standard span is 25m and 30m, and the span of some of the auxiliary roads across the ground is appropriately increased.