螺锁式连接预应力异型抗拔管桩抗拔性能研究

Study on anti-pulling performance of prestressed special-shaped anti-pulling pipe pile with screw-locked connection

文章介绍螺锁式连接预应力异型抗拔管桩(简称“异型管桩”)的外形特点和接桩技术,通过单个连接件抗拉实验研究其接头抗拉能力,与普通预应力管桩(简称“普通管桩”)进行现场抗拔承载力对比试验,研究异型管桩抗拔承载能力。研究结果表明:螺锁连接件抗拉性能优良,接桩技术操作简单、可靠;异型管桩的单桩竖向极限抗拔承载力比普通管桩提高66%以上。该文分析表明,异型管桩特有的凹凸外形改变了桩-土接触方式,可有效增加桩与土体的握裹能力,大大提高抗拔承载能力,经济效益显著。

In this paper,a prestressed special-shaped anti-pulling pipe pile with screw-locked connection(referred to as special-shaped pipe pile)is proposed.The shape characteristics and pile connection technology of special-shaped pipe pile are introduced,and the tensile strength of joints and the anti-pulling bearing capacity of special-shaped pipe pile are studied through the tensile test of a single connector and the comparative test of the anti-pulling bearing capacity of the traditional prestressed pipe pile(referred to as traditional pipe pile)in the field.The research shows that the screw-locked connector has excellent tensile performance,the operation of pile connection technology is simple and reliable,and the ultimate anti-pulling bearing capacity of the special-shaped pipe pile is improved by more than 66%compared with that of the traditional pipe pile.It is indicated that the unique concave-convex shape of the special-shaped pipe pile changes the pile-soil contact mode,effectively increases the gripping capacity of the pile and soil,greatly improves the anti-pulling bearing capacity,and has significant economic benefits.