本发明的Q345B矩形管芯棒作成为上下自由弯曲，它是利用侧面约为新月形的每个模块在其左右两半部分上的中心加工的通孔中穿过绞合钢丝绳的方法，将每个模块叠合捆束连接而成.每个模块的前弯凸部下半侧成形为倾斜向下的倾斜面.将上述连接的模块群枢轴式连接到基杆的前端，在弯曲加工Q345B矩形管时，预先插入芯棒，由于其从内部支撑Q345B矩形管，所以能够防止Q345B矩形管的断面不会被破坏，或变成扁平形，或发生龟裂和皱纹.
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