埋地管道凹坑缺陷开挖验证

Excavated verification technology of pit defects of buried pipeline

埋地管道凹坑缺陷开挖验证时,发现内检测结果与现场开挖验证结果间存在较大差异,因而为内检测数据的评估及修复判定带来困难。研究发现,这是由于缺少统一、规范的开挖验证程序和有效的测量方法造成的。结合目前国内外凹坑现场开挖验证方法及现场实践经验,提出了一套凹坑缺陷开挖验证程序,并根据现场实际进行开挖验证,结果表明该凹坑缺陷开挖验证程序具有可行性。着重对不同凹坑测量方法的结果进行了比较,结果表明三维激光扫描法能够得到准确的凹坑深度值和整体轮廓,并可基于输出结果直接进行应变分析等进一步的评估工作。(图6,参6)

As to pit defects of a buried pipeline, it is found that there is a big difference between the inner inspection result and the excavated verification result, which makes it difficult to assess the data from inner inspection and determine the necessity of repair. Investigation revealed that this is due to the lack of a unified and standard excavated verification procedure and effective measuring method. Combining the existing excavated verification methods and field practices in China and abroad, a set of excavated verification procedure is proposed in this paper, and it is applied under practical conditions. The results show that the excavated verification procedure is feasible. Moreover, the results of different pit measurement methods are especially compared, indicating that accurate pit depth value and overall outline can be obtained using 3D laser scanning method, and further evaluation like strain analysis can be carried out based on the output result. （6 Figures, 6 References）