PHC pile and water flush gas lift static pressure pile-sinking method

Abstract

The present invention is new type of PHC pile and its water flushing-air lifting hydrostatic pile sinking process. The water flushing-air lifting hydrostatic pile sinking process includes the following steps: hydrostatic pile sinking in the surface soft soil layer; water flushing and air lifting hydrostatic pile sinking in the sand and pebble layer; and hydrostatic pile sinking in the soft soil layer or sandstone layer below sand and pebble layer until reaching the designed level. Compared with available perforating and pile grouting process, the present invention has 40-50 % lower cost and is superior in engineering quality, construction period and environment protection. The pile can penetrate any covering layer and its end can be reach ideal bearing course fast.

Description

Technical field: [0001] The invention relates to a new type of PHC pile and a water-pulverized air-lift static pressure pile driving method. Background technique: [0002] In urban construction pile foundation projects, the noise generated by hammering piles is not conducive to environmental protection. In recent years, the method of static pressure sinking PHC piles has been widely used. This method is suitable for soft soil foundations without sand or gravel hard interlayer. For foundations with a hard layer of sand or crushed pebbles and pure sand or crushed pebbles, because the sand and gravel layer has too much resistance to the pile driving, the static pressure PHC pile cannot pass through the sand or crushed pebbles layer, so this method is useless. When the pile sinking becomes an unsolvable problem. [0003] In soft soil foundations, there is often a soft soil layer under the hard layer of sand or gravel. For buildings with large loads or important buildings, due t...

AI Technical Summary

Problems solved by technology

[0002] In urban construction pile foundation projects, the noise generated by hammering piles is not conducive to environmental protection. In recent years, the method of sinking PHC piles under static pressure has been widely used. This method is suitable for soft soil foundations without sand or broken pebble hard interlayers. For foundations with hard layers of sand or crushed pebbles and foundations of pure sand or crushed pebbles, the static pressure PHC pile cannot pass through the sand or crushed pebbles because the sand layer has too much resistance to pile sinking, so this method is useless. Pile sinking becomes an unsolvable problem

Images