十字形沉管灌注桩的成桩工艺技术

改变桩截面形状，增加桩周面积，可提高桩承载力，因此导致了异形截面桩的诞生。目前我国研究较多的多种异形截面桩如X桩、Y桩等，均是采用全长等截面的异形截面模管沉管成桩。由于这些异形截面模管抗变形能力相对较弱，在应用到长桩或超长桩的施工上可能会受到一定的限制。十字形桩成桩模管为底部加翼的圆形截面钢模管，抗变形能力强，能成大桩长桩或超长桩、混凝土素桩或钢筋混凝土桩、挤土桩或非挤土桩，既可用于地基处理，也可作为基桩施工。非挤土桩成桩时，采用专用管内取土装置，施工快捷，成桩效率高，成本低。

Pile-formed technology for cross tube-sinking cast-in-place pile

The change of pile cross section can increase the lateral area of pile, and pile bearing capacity can be improved. Based on this, the piles with abnormal section were developed. At present, a variety of special shaped section piles on which research or application is more, such as X and Y pile, are formed by the casing with uniform section and tube sinking method in China. Because the deformation resistance capability of these casings is weak, application of these casings on construction of long piles or super long piles is limited. The casing for the cross shaped pile is the circular steel casing with bottom wings, and has strong resistance to deformation. So, it can be used in construction of big piles, long piles or super long piles, concrete or reinforced concrete piles, soil squeezing piles and soil borrowing piles, which can be used for foundation treatment, and also for construction of the foundation piles. When the special soil borrowing devices are used for non soil squeezing piles, quick construction, high efficient pile forming and low cost can be able to realize.