casing collar

In this paper the three dimensional stress field of the CD350 casing elevator was analysed and stressintensity factors Of the crack with different depth and shape on the critical section was solved by FEM displacementmethods.

首先对ＣＤ３５０套管吊卡三维应力场进行分析，进而采用有限元位移法，求解危险截面处不同深度和形态表面角裂纹的应力强度因子。

Suspender presetting technology of PVC suspender casing and steel inserted bar are adopted.

结合工程实际情况,针对机电吊杆生根于预应力楼板的特点,采用PVC吊杆套管+钢筋插杆的吊杆预设施工方法。