With the development of social economy, the improvement of people's living level, and the improvement of supporting facilities in residential quarters, the comprehensive management of the underground pipe network of residential quarters has been paid more and more attention. Because the control, management, maintenance, and improvement of water, electricity, gas and other living facilities are directly related to people's quality of life, underground pipeline detection in residential communities is becoming more and more popular.
Different from the underground pipelines in the roads, there are many types of pipelines in the residential community, such as many branches and small branches, and the signals are weak and dense, which makes the detection more difficult.
In order to ensure the detection accuracy and improve the work efficiency, I have summarized a very effective detection method through work practice.
1. Master the regularity of cell detection
The community pipeline is dense and complicated. If you blindly measure it, you will have the feeling of “the sky and the earthâ€, but if you master the rules, you will be strategizing and working in the chest.
1.1 power cable
The 10kV high-voltage cable (or high-voltage power pole) on the road adjacent to the cell is introduced into the cell, usually two cables side by side, and connected to the total transformer room in the cell. The transformer is led out from the transformer room to the power distribution cabinet at the entrance of the building or the entrance of the corridor.
The 10kV high-voltage cable signal is sometimes not very strong, but the cable signal after the transformer is strong, so be sure to distinguish it from other pipelines such as water, gas, etc.
1.2 Sheung Shui
The water main pipe from the adjacent road of the community is introduced into the cell through the general section door, and the branch is led out to the front of the building in the main road, and then branches to the household through the water meter well or directly to the household.
The main signal is medium, and the branch signal is weak and easily flooded by other pipeline signals.
1.3 gas
The gas main pipe from the adjacent road of the residential area is introduced into the residential area. If there is a gas pressure regulating station in the residential area, the medium pressure pipe is introduced through the pressure regulating and the low pressure pipe is introduced. If there is no pressure regulating station, the low pressure pipe is directly introduced, and the low pressure gas is directly introduced. The pipe leads the branch to the front of the building in the main road, and then branches to the household or directly branches to the household. The low-pressure pipe regulated by the pressure regulating station may also additionally lead out the community for other community gas.
The gas signal is generally strong, and the inductivity is also strong. The signal is easy to sense on other pipelines.
1.4 heating
Overhead or underground pipelines enter the community (the individual districts also have their own heating boiler rooms), branching to the building on the main roads through the heat wells to enter the household or directly into the household.
The heat pipe is arranged side by side for the two pipes for heating and returning water, and the signal is strong.
Some districts have geothermal pipelines, and the buried pipelines are similar to the heating pipelines. They are both heat and return water pipes, and the signals are similar to the heating pipes.
1.5 communication, cable TV, internet network
The cell is introduced from the communication well (or overhead) of the adjacent road of the cell, and passes through the communication well to the building, and then enters the corridor through the communication well.
Although the signal is weak, it generally passes through the communication well.
1.6 launching
Rainwater is generally introduced from the rainwater main pipe of the adjacent roads of the community to the main road of the community, and then branches to some rain rafts on the main road, and generally does not enter the building.
The sewage is generally introduced into the community from the sewage main pipe of the adjacent road of the community, and branches to the septic tank in the building on the main road of the community, and then branches to the sewage well in the building to enter the household.
The launching of the water is mainly a well survey.
1.7 street lights and community facilities cable, watering hose
The general transformer room is led out to the distribution box (or directly to the street lamp or community facility). The watering pipe is generally led to the green space by the water main pipe on the community.
These pipeline signals are weak, but the location where they are buried is generally located in the open space of the cell, there is no other pipeline interference, and there are generally obvious signs of exposure.
After understanding the laying rules of these pipelines in the community, the targeted detection will be carried out in an orderly manner and the detours will be reduced.
2. Basic steps from shallow and deep detection
Although it is known that the law of burial is generally buried, it is detected from the dense branches to the main pipe. The so-called "rural encircling the city" is easy to sense each other because of the dense pipeline signals, and sometimes it feels like entering the maze. From simple to complex, from known to unknown, from trunk to branch, this is the shortcut to detection.
2.1 look at the picture after the test
"Talking on paper", before looking at the map, look at the map, understand the location pattern of the community, and investigate the existing data will be very helpful for detection. In addition, from the topographical features identified in the figure, the well position can be a good overall understanding of the detection situation.
2.2 first look at the scene and then detect
After entering the site, look at the site as a whole, so that you can find the entrance of the substation, the pressure regulating room, and the main trunk of the road, so that it is easy to determine the main pipe.
2.3 Measuring the main road of the main trunk
Firstly, the main pipe of the entering the community will be measured, and the important facilities such as the substation and the pressure regulating room will be measured as clearly as possible, and then the main road of the community will be clearly solved, and the source of the branch detection will be found.
2.4 Look at the branch before the building
Investigate clearly the various visible wells, visible pipeline access points, and visible signs, and open more wells to see, so that you can master the rich information, which will greatly help the next detection.
2.5 from easy to difficult
Start with a good signal pipeline, and then gradually test the pipeline one by one.
2.6 problem solving
Don't hang around in the face of difficulties, first solve the problem that can be solved, and finally focus on solving the difficult problem.
This is a steady and steady pace, and we believe that our eyes will not be a "maze."
3, continuous practice can get practical detection technology
More accurate and faster detection of pipelines is the detection technology we are pursuing. This requires in-depth research, a large amount of practical experience, and further integration and proficiency.
3.1 first and last determine the middle
When the pipeline is dense and complex, the pipeline is not easy to distinguish, but in the detection of the community pipeline, we can easily find the branch point of the main trunk and the entry point of the branch pipe. The tracking of the middle can be simplified by the first and last tracking.
3.2 Signal strength
According to the pipeline characteristics in the same cell, the strength and weakness of the pipeline in the region can be roughly grasped, and the detection progress can be greatly accelerated in the detection, and it is also helpful in solving the problem.
3.3 low power close range detection
Cell detection often has a narrow detection range. By narrowing the power, detecting it at close range, and accumulating experience to distinguish the target signal from the primary field sensing signal, the problem is solved.
3.4 Frequency response
Different pipelines in a certain area have different signals for different frequencies, and effectively use their differences to distinguish them by different characteristics.
3.5 cross induction
Some pipelines do not have good sensing signals. We can cross the pipeline with the ground inductively, so that the sensing signal is enhanced to achieve the purpose of detection.
Each area in the actual detection has its own characteristics. Sometimes the performance of the same pipeline in different regions is quite different, so it should be detected according to the actual situation.
4. Research on common problems in community detection
4.1 Adjacent pipeline distance
Adjacent pipelines are too close or even overlapping, and they can be identified by “first-to-tail tracking†and by their small quantitative differences.
4.2 pipeline signal is too strong to submerge other pipeline signals
The line can be shielded by a crimping method to measure other lines, and sometimes two identical line meters can be used for simultaneous crimping and tracking.
4.3 weak signal
If the material, depth and tube diameter are too small, the signal will be weak, and the power of the transmitter itself will be insufficient. The use of the large coil method will increase the power and make the signal stronger.
4.4 non-excavation crossing pipe
This type of pipe is generally on the road and is rarely seen in the community. The solution to this type of pipe is mainly to find the corresponding completion data, which can be solved. Guides and gyroscopes can also be used if there is no power-up and tube-through method available, although they are slightly more complicated to use but the data is accurate.
For the difficulties, we should not blindly test. When we have a problem, we think about instruments, power, etc. Sometimes we find out the things around the difficulties and have a more reasonable inference. Let’s try again along this line of thought. There are new discoveries.
Conclusion
The above is some experience and experience of the underground pipeline detection method in the community. Let us work together to make the underground pipelines more accurate and perfect. This will make the residential community more complete and more convenient to maintain, and our life will be More comfortable.
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