In order to solve the torsional problem of precast concrete screw pile in construction,the torsional behaviors of precast concrete pile body were designed strongly and studied by experimental method.

,Ltd",through two kinds of foundation building experiments: digging and injection stake by human power,prefabricated concrete square stake,to explore solutions to foundation building in wet sink earth area,and provide reference to future foundation building in such earth.

Based on some engineering practical experience in Nanjing Economical Technical Development Zone,the article introduces the construction method of static pressure process for the prefabricated concrete pipe pile,and under the different geological conditions,some problems should be paid attention under the construction.

cop accomplished the in-situ test of RC prefab pile、vibrate tube cast-in-place pile and vibroflotation gravel pile composite subgrade for the third project of Shajiao firepower plant because the stratum condition did not meet the requirement of nature subgrad.