Jiaolingqian Bridge is 306.4m long, and it starts from the pile K108+372.8 to pile K108+679.2. The bridge span is 10x30(m), pier height ranges from 11m to 34m.Jiaolingqian Bridge is the No.1 high bridge in East China. It is a separate double bridge. Each bridge has 2 lanes. The upper part uses prestressed continuous steel structure, and the lower part uses double concrete thin-wall rectangle piers. It is not suitable to use drilling machine as there are karst caves in the ground and pile foundations are close to each other, which has high risks and technical difficulties. Finally, the project uses manual excavating and cast-in-place concrete piles, which guarantees the construction quality and safety. It saved cost of 780,000 Yuan and shortened the construction period by 53 days.