Abstract: There is a great development of underground space in the Yujiapu area, in Tianjin. The problem of anti-float is serious, because of the buried depth of the basement is deep and the groundwater table is higher. The monolayer area is about 30,000 m2; and the buried depth of the basement is about 16 m. Based on the Yujiapu north-south underground garage, the tests on pedestal uplift piles and side-grouting uplift piles are canied out. The tests show that, compared with the normal uplift piles, the pedestal uplift piles and side-grouting uplift piles have advantages of greater uplift bearing capacity and shorter pile length; so that its economic benefit is notable. The pedestal pile is better than the side-grouting piles in the aspects of ultimate bearing capacity and displacement controlling. The pedestal uplift pile is used in the garage; full hydraulic swivel-driven construction technology is used too. The successful using of the pedestal uplift piles has great significance and practical engineering value; it will be a good practical case for similar projects.

Key words: pedestal uplift pile, Yujiapu, underground garage, anti-float