Secant winged case-in-place piles with rectangular case and soil dragline

A significant difference between the rectangular cross-section pile and the circular cross-section pile in performance is that the former has higher bending resistance . Based on this, a new technology for secant winged case-in-place piles is proposed, and its construction process is introduced. The pile formation by this new technology is as follows: first, the winged steel pipe which is welded with steel convex is used to support the wall; secondly, a special soil dragline is applied to draw the soil out clearly in the steel pipe; thirdly, the reinforcement cage is put in and the concrete is poured into the pipe; finally, the steel pipe is remove d and the pile is formed. In addition, jointless interlocking with the former pile is realized through cutting its convex concrete. T his technology, which can replace the current traditional circular cross-section pile, is a conserving energy and reducing emission technology due to non-mud emission construction. The construction efficiency is improved gre atly by the special rectangular soil dragline and fast pole connecting technology.