顶管中纠偏角度过大对顶力的影响

Effect of Excessive Deviation Adjustment Angle on Pushing Force in Pipe Pushing Operation

在宁波市北渡—雅戈尔原水DN1800mm钢管复线工程顶管施工中,出现主顶动力站顶力异常增大的现象,影响继续顶进施工,文章针对这一情况进行分析研究,通过理论顶力曲线与实际顶力曲线以及工具管所经轨迹与管道在土层中静止时的形态图的分析比较,得出主顶动力站顶力过大是因为在纠偏过程中纠偏角度过大,使管道在短距离内过度弯曲引起的。在采取了相应的有效措施后,顺利完成了顶管施工任务。通过本次施工,得出的经验是:在顶管时,如果管道轴线出现偏差,在纠偏时应采取勤测量、勤纠偏且小量纠的方法,限制纠偏角度,防止导向过急。

During the pipe pushing construction of the parallel steel water pipeline of Beidu-Yanger pipeline project in Ningbo, the pushing force in main pushing power station appeared unusual increasing and the construction had to be interrupted. Through the analytical comparison between theoretical and practical pushing curves as well as the analytical comparison between the tool pipe track and the form map of pipeline resting in soil, it was found that the excessive pushing force in main pushing power station was caused by excessive deviation adjustment angle which enabled the pipeline to over bend in a short distance. After taking the proper measures, the construction of pipe pushing has been successfully fulfilled. The experiences gained from this construction is, when pipeline axis appears deviation during pushing, the measures including frequent measuring and frequent but small adjustments should be taken in order to avoid jerky guiding.