As far as pipe well construction is concerned, if the construction quality of the pipe well drilling is poor, the design requirements are not met, the well inclination exceeds the regulation, or the well pipe installation process and the gravel process do not meet the design requirements, resulting in uneven thickness of the filter material, and the well washing is also There is no way to meet the specified sand content standards for well water.

The inspection standard of well effluent effect is discussed as the tube well acceptance acceptance standard. The size of the pipe well water is discussed, which is directly related to the correct design of the tube well, especially related to the design of the tube well filter. If the tube filter design is unreasonable, the filter is effective. If the water area is too small or the filter material size is too small, the head loss will increase, and the water output of the single well southwest water supply and drainage station will be small.

In terms of tube well construction, the quality of tube well drilling, well pipe installation and gravel processing will also affect the water output of the tube well. Therefore, the amount of water in the tube well is also a comprehensive reflection of the design and construction quality of the tube well, not simply washing the well. A process can be determined, which shows that it is not appropriate to use the tube well quality standard as the inspection standard for the well washing and discharging effect.

The above discussion shows that although the quality standard of tube well is closely related to the quality standard of well washing, the two are not equal. It is unfair to use the quality standard of tube well as the quality standard of well washing process, and it does not meet the actual situation of tube well engineering. It is unreasonable to apply the well quality standard for well quality standards, which confuses the difference between the quality standard of well pipe and the quality standard of well washing, and brings many drawbacks of practice.

The quality inspection of well washing should be carried out in the stage of the well washing process. As mentioned above, the technical standards of the Ministry of Construction’s standard “Code for design, construction and acceptance of water supply pipe wells” CJJ10-86 and national standard “Technical specifications for water supply pipe wells” GB50296-99 The inspection standard for water content of sand is stipulated whether it is necessary to check whether the stable value of sand content in well water meets the requirements after pumping is stable, that is, it is worthwhile to examine the quality of well washing in the pumping test stage.

The purpose of the well cleaning quality inspection is to verify whether the effect of the well washing meets the requirements, and to find out the problem in time to ensure the quality of the well washing. Therefore, the quality inspection of the well should be carried out at the stage of the well washing process, instead of waiting for the next process to pump water. Inspection is carried out during the test phase, which may result in rework. In addition, it is uneconomical to require the tube well to pump water for a long time and to stabilize the measured sand content of the well water after stabilization.

According to the purpose of well washing and the characteristics of the well washing process, the quality standards for pipe well washing should be: 1) Well water does not contain pipe well construction materials such as mud. 2) During the 24-hour continuous well washing process, the unit water output no longer increases, and the sand content of the well water is no longer reduced.

The above-mentioned well cleaning quality standards are described as follows: For the first article, it should be said that it is the basic requirement for well washing. Well washing, as the name implies, is to wash away the pollutants in the aquifer from the construction of the pipe well, including the attachment to the well wall. Mud and mud or other flushing medium that penetrates into the aquifer. During the well washing process, some fine particles of the aquifer are extracted, and a well-permeated ring zone is formed around the filter pipe to increase the water output of the pipe well. . Well washing well, the pipe well water will naturally not contain mud and other pipe well construction materials, that is, the effluent after washing the well should be restored to the original physical and chemical properties of the groundwater. Its inspection should be observed and identified during repeated well washing.

Conclusion Washing well is one of the key processes of tube well forming technology. Well washing quality standards are undoubtedly of great significance for correctly guiding engineering practice and ensuring the quality of well washing. So far, the quality standards for well washing are still the subject of disagreement and controversy at home and abroad. At present, there are many quality standards for well washing in China, and the differences are different. There are many problems worth discussing, which not only lead to confusion in engineering practice, but also affect the quality of well washing. Correctly setting the quality standards for well washing is obviously a theoretical and practical issue that needs to be solved urgently in tube well engineering and hydrogeological exploration engineering.

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