Cleaning method

The purpose is to create a moderate gap on the outside of the hole opened for water collection in the pipe to encourage the inflow of groundwater.

We would like to introduce the "Cleaning Method" of Hokuto Drill Co., Ltd. In the first step, water is sprayed forward while probing the inside of the pipe with the nozzle, crushing deposits, cutting roots, and detaching scale. The internal condition can be inferred from the measurements taken before cleaning and during this process, as crushed materials, cut roots, and scale fragments are discharged. Next, in the second step, water is sprayed backward to discharge any remaining materials inside the pipe. The nozzle is quickly brought to the bottom of the hole and retracted, completing the cleaning to eliminate contaminants. In the third step, this method is not effective for all soil types. In cohesive soil mixed with gravel up to medium grain size, the discharge of recovered spring water continues for a while after cleaning, indicating its effectiveness. However, silt layers and sandy layers have smaller particle sizes, and materials like pumice expand, so excessive water application can lead to the inflow of unnecessary sediment. Washing away small sand from gravel layers can cause the gaps between the gravel to clog, resulting in pipe breakage or rupture due to flow and soil pressure. This process should be determined based on the soil type at the location and the outflow from inside the pipe, rather than theoretically. *For more details, please refer to the related links or feel free to contact us.

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