Method of the cast-in-place friction pile well walls local soil compaction

For improving the bearing capacity of the foundations on cast-in-place friction piles, the well walls local soil compaction technology is proposed to be used. The idea of the local soil compaction technology is to form the well having a cross-section different from the traditional round one. The application prospects theoretical justification of the shortened hypocycloid as a cast-in-place friction pile cross-section shape was carried out. The possibility of the cast-in-place friction pile bearing capacity considerable improvement is shown. The pile bearing capacity as compared to the traditional circle section without additional costs can theoretically be increased by the value of up to 80%. The basic arrangement of the attached working body for forming the well having a cross section in the shortened hypocycloid shape is presented. The proposed technical solution application when constructing foundations only in housing construction will make it possible to save annually on the piles material over 400 million rubles.