1, pipeline periscope inspection (QV)

In the rough survey of pipelines, pipeline periscope inspection (hereinafter referred to as QV) obviously occupies an advantage. First, it is convenient to connect; Second, the operation is simple; Third, the lens is put into the inspection well, and the situation inside the tube is clear at a glance; Fourth, it is more portable than other musical instruments. QV is undoubtedly the best choice to get a preliminary understanding of the pipeline situation. However, due to its limitations, it can not meet the requirements of carefully detecting pipeline defects.

2, pipeline closed circuit television detection (CCTV)

Closed circuit television inspection (CCTV) of pipelines (CCTV here is not CCTV) is mainly to understand the specific situation of pipelines by crawling inside them. Its obvious advantage is that we can have a clear understanding of the situation in the pipeline with the help of the lens of the crawler. If there is any problem in the pipeline, the crawler can carefully judge the problem with the help of the lens when going to the defect. Of course, its limitation is that there is a lot of water and sediment in the pipeline, and its capacity is limited when there are large obstacles in the pipeline.

3. Sonar detection

Sonar detection is mainly used to solve the problems of detecting the amount of sediment in the pipeline and the deformation of the flexible pipeline when the water level in the pipeline is high. The sonar probe is moved in the pipeline by the traction of the traction rope to measure the siltation in the pipeline, which has a significant effect on the statistics of siltation in the pipeline and the prediction before dredging.

Second, what are the detection methods for municipal pipeline detection?

1. Manual observation method: professional technicians directly observe with naked eyes, and underground professionals touch with their limbs, supplemented by necessary measurements, to obtain the situation and corresponding data in drainage pipes, inspection wells and the ground. Specific methods include ground patrol, well opening adjustment, personnel entering the pipeline inspection, well entry or pipeline inspection.

2. Simple instrument method: use simple tools to assist professional and technical personnel to check or inspect drainage pipes. Specific tools are: reflector, ditching cow, mud bucket, laser pen, etc.

3. Determination method of pipeline detection equipment: use pipeline detection equipment to detect drainage pipelines. These instruments include: CCTV (television) pipeline inspection robot, 3D sonar inspection system, pipeline Q ⅴ periscope, drainage pipeline leak detector, etc. These methods are commonly used detection methods at present.

4. Test and verification method: physical or chemical methods are used to test and obtain the verification of specific requirements. It mainly includes: closed water test, closed air test, smoke test, dyeing test, slope decline test, COD determination, etc.

These municipal pipeline detection methods are complementary and interoperable in practical application, which can make up for the shortcomings of various methods and ensure the internal problems of pipelines to be solved.

Precautions:

Because most people are on the road during pipeline inspection, safety is undoubtedly the most important. After the road safety measures are in place, open the manhole cover. When the manhole cover is opened and there is a strong odor in the well, open the manhole cover connected with it as soon as possible for ventilation until the odor is reduced or gone. After the manhole cover is opened, in addition to placing equipment, people should leave the well slightly to prevent people from accidentally falling into the well. Smoking is not allowed within 5 meters of the well site after well opening, so safe operation is very important.