By determining rational fulcrum and force bearing point, and applying bending torque to cause the plastic deformation of the steel pipe, it can realize the cool bending of the pipe.
这种弯管机由钢制机架、下模、上模、夹具、液压系统和内胎等组成，其工作原理是通过确定合理的支点和受力点并施加弯曲力矩，使钢管发生塑性变形，实现钢管的冷弯曲。
For making the theoretic results close to the fact, two methods used to calculate the internal force of beams with finite length bearing several point loads and on soil foundation were compared.
为了使理论结果能尽可能准确地反应实际情况，就土质地基上受多个集中力作用的有限长梁的内力计算方法进行了对比分析。
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