The welding procedure of steel box girders for the auxiliary municipal works of metro Line 7 in Chengdu, fabricated by CRBBG's Tianyuan Company, passed the review in Chengdu on April 24.

The contract for fabrication and erection of steel box girders for the municipal works of Chengdu metro Line 7 includes the projects of Yipintianxia Interchage, Qingshui River Bridge, Wuhou & Shuangnan Interchange, Wannianchang Interchange, Science & Engineering University Crossing Interchange and Erxianqiao Interchange. The total weight is up to 23,000 tons and the scheduled construction period is 12 months.