Application of Key Technology for Construction of on-Water Vibration Sinking-Pipe Gravel Piles

In view of the problems such as the less of application of on-water construction of vibration sinking-pipe gravel piles, the lack of suitable ship and equipment and the difficulty in quality control, and so on, a set of effective on-water construction techniques and quality control measures are formed by transforming the ship and equipment for the construction, optimizing the key technical parameters and construction technology, which are fast in feeding rate, accurate in gravel addition and measurement and high in automation level and construction efficiency. The results from the tests have indicated that the formed piles have large diameter, good drainage effect, high bearing capacity of foundation and small late settlement. As a result, many technical difficulties occurring in the construction of on-water vibration sinking-pipe gravel piles can be solved, for instance, obstruction of gravel falling, insufficient irrigation amount, poor compactness, and or so. And also, the efficiency of piling can be improved, the quality of piling can be ensured and the construction cost can be reduced. The techniques formed in this study are suitable for reinforcing and treating the soft soil foundation which needs to meet the construction requirement of superstructure fast loading.