Photo taken on Jan. 25, 2016 shows the construction site of steel truss girder of Jinan Yellow River railway and highway combined bridge in Jinan, east China's Shandong Province. The double-deck bridge, with a two-way six-lane highway and four railway tracks, is a part of Shijiazhuang-Jinan passenger railway line. (Xinhua/Liu Junxi)

JINAN, Jan. 25, 2016 (Xinhua) -- Photo taken on Jan. 25, 2016 shows the construction site of steel truss girder of Jinan Yellow River railway and highway combined bridge in Jinan, east China's Shandong Province. The double-deck bridge, with a two-way six-lane highway and four railway tracks, is a part of Shijiazhuang-Jinan passenger railway line. (Xinhua/Liu Junxi)

Photo taken on Jan. 25, 2016 shows the construction site of steel truss girder of Jinan Yellow River railway and highway combined bridge in Jinan, east China's Shandong Province. The double-deck bridge, with a two-way six-lane highway and four railway tracks, is a part of Shijiazhuang-Jinan passenger railway line. (Xinhua/Liu Junxi)

Photo taken on Jan. 25, 2016 shows the construction site of steel truss girder of Jinan Yellow River railway and highway combined bridge in Jinan, east China's Shandong Province. The double-deck bridge, with a two-way six-lane highway and four railway tracks, is a part of Shijiazhuang-Jinan passenger railway line. (Xinhua/Liu Junxi)

A worker checks hydraulic device at the construction site of steel truss girder of Jinan Yellow River railway and highway combined bridge in Jinan, east China's Shandong Province, Jan. 25, 2016. The double-deck bridge, with a two-way six-lane highway and four railway tracks, is a part of Shijiazhuang-Jinan passenger railway line. (Xinhua/Xu Suhui)

Photo taken on Jan. 25, 2016 shows the construction site of steel truss girder of Jinan Yellow River railway and highway combined bridge in Jinan, east China's Shandong Province. The double-deck bridge, with a two-way six-lane highway and four railway tracks, is a part of Shijiazhuang-Jinan passenger railway line. (Xinhua/Xu Suhui)

The combined photo taken on Jan. 25, 2016 (upper), on Aug. 5, 2015, and on May 7, 2015 (lower) shows the construction process of steel truss girder of Jinan Yellow River railway and highway combined bridge in Jinan, east China's Shandong Province. The double-deck bridge, with a two-way six-lane highway and four railway tracks, is a part of Shijiazhuang-Jinan passenger railway line. (Xinhua/Xu Suhui)