防汛抢险螺旋桩设计与焊接过程分析

The Design and Weld Analysis of Spiral Pile for Preventing Flood and Rushing to Deal with an Emergency

本文提出了一种新型的防汛抢险螺旋桩机,桩体采用钢制螺旋桩,桩体在电机的旋转下被直接拧入地里。该桩机能够很好地解决了打击式沉桩方式造成的问题。防汛抢险螺旋桩机的一个关键技术是螺旋桩的设计。考虑到螺旋叶片与圆管焊接时变形过大造成桩沉入时摩擦阻力增大,本文基于有限元分析方法,利用大型有限元软件Ansys7.0对焊接过程进行了模拟,得出了焊接后整个螺旋桩体的变形情况。本文为解决薄壁复杂结构的建模分网提供了参考,并利用ANSYS软件实现了薄壁三维实体的焊接模拟过程。

Present institution of research on various pile driver systems for preventing flood and rushing to deal with an emergency is described, and a new type of pile driver system, named spiral pile driver system for preventing flood and rushing to deal with an emergency is put forward and developed. The spiral pile driver system is made up of a spiral pile driver and a spiral pile and can be used without causing the problems which the pile driver system causes. In the developing process of the spiral pile driver system, one of key technologies is the design of the spiral pile. The structure and basic parameters of the spiral pile are primarily determined according to its purposes. The spiral pile is made up of a thin steel spiral lamina, a thin steel tube and a thin taper-face tube through weld. Considering that weld distortions will increase the friction between the spiral pile and soil, the author simulates the weld process using the FEA software ANSYS on the basis of FEA theories. The result of the weld simulation shows the maximal distortion of the spiral pile is 1.65mm, which affects the structure slightly.