Secant winged case-in-place piles with rectangular case and soil dragline
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摘要: 矩形截面桩与圆形截面桩性能上的一个显著差别是前者的抗弯能力强。基于此,提出了矩形钢模管护壁干取土咬合灌注桩方法,并详细介绍了施工工艺新技术。新技术是通过在模管侧边焊接钢凸边形成的带翼矩形钢模管护壁,用专用提土器取净钢模管内土体,置入钢筋骨架,灌入混凝土,再振动拔出钢模管即成桩；通过邻桩切割前桩凸边混凝土,与前桩实现无接缝咬合。该技术是能替代目前传统的圆形截面支护桩的节能减排低碳技术,实施无泥浆排放施工。专用矩形取土装置和快速接管 ( 杆 ) 技术,使得施工效率大大提高。Abstract: 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.
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