“声呐+电法测漏”组合技术对满水末端干管的内窥检测研究

Study on Endoscopy Detection of Water-filled End Trunk Pipe by Combined Technology of "Sonar + Electrical Leak Detection"

污水管网的末端干管通常在高水位或满水位状态下运行,需要通过封堵、导排以降低管道水位后方可采用CCTV、QV的手段进行内窥检测,这种方法存在效率低、成本高的缺点,因此探索在满水状态下的末端干管内窥检测技术具有十分重要的意义。采用“声呐+电法测漏”组合技术开展满水末端干管的内窥检测工作,并通过CCTV检测进行平行验证,以判断该组合技术的准确性和适用性,为污水管网的管养维护提供技术支持。通过实地试验,“声呐+电法测漏”组合技术可对满水末端干管内存在的主要结构性缺陷及功能性缺陷进行有效识别,最小目标分辨能力为0.1 m,理论误差为0.02 m;对于较小尺寸的异物穿入,“声呐+电法测漏”组合技术无法有效识别;对于穿入异物的材质,该组合技术无法识别,需要辅助其他手段予以确认。

The end trunk pipe of sewage pipe network usually runs in the state of high-water level or full-water level. CCTV and QV can be used for the endoscopy detection after blocking and drainage to reduce the pipeline water level. This method has the disadvantages of low efficiency and high cost.Therefore, it is of great significance to explore the endoscopic detection technology of end trunk pipe in the state of full water. The combined technology of "sonar + electrical leak detection" is used to carry out the endoscopy detection of water-filled end trunk pipe, and the parallel verification is conducted through CCTV detection to judge the accuracy and applicability of the combined technology, which can provide the technical support for the management and maintenance of the sewage pipe network. Through the field tests, the "sonar + electrical leak detection" combined technology can effectively identify the main structural and functional defects existing in the water-filled end trunk pipe. The minimum target resolution capability is 0.1 m, and the theoretical error is 0.02 m. For the penetration of smaller-sized foreign objects, the "sonar + electrical leak detection" combined technology is hard to effectively identify.For the materials penetrating foreign mater, this combined technology is hard to identify, the other means are required to assist for confirmation.