水平定向穿越大口径管道起吊仿真分析

Simulation of lifting large diameter pipelines in horizontal directional crossing

水平定向穿越管道起吊过程中,管道的吊点位置决定管道入土角度,如果入土角度偏大或者偏小,都可能导致管道在入土时发生卡管或瘪管事故。通过对管道起吊过程中入土角度、吊点位置对管道应力的影响进行仿真分析,得到:吊点2与管道前端相距10m,入土角为10°时,两吊点的许用间距为22~28m;入土角为12°时,两吊点的许用间距为28~36m;入土角为14°时,两吊点的许用间距为30~36m,此时管道起吊过程中,管道处于安全状态。当入土角度超过16°时,管道应力超出了管道的屈服应力,因此管道入土角度不宜超过16°。

During hoisting of the pipeline in horizontal directional drilling, the hoisting point on the pipeline determines the entry angle into ground. If the entry angle is too large or too small, it may cause either sticking or collapse of the pipeline. Through the simulating analysis for the influence of the entry angle and the lifting point during the lifting process, it is obtained that with the distance between the lifting point No.2 and the front end of the pipeline at 10m, when the entry angle is 10°, the allowable space between the two lifting points is 22~28m;when the entry angle is 12°, the allowable space between the two lifting points is 28~36m;when the entry angle is 14°, the allowable space between the two lifting points is 30~36m. In such a way, the pipeline is in a safe state during the lifting process. When the entry angle exceeds 16°, the pipeline stress exceeds its yield stress;thus, the entry angle should not exceed 16°.