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"Landslides" can occur even on gentle slopes compared to slope collapses. They continue to slide slowly every day without stopping, and due to the depth of the sliding surface, the scale of the collapse can be many times larger. Even if they stabilize for a while, if the groundwater level rises, sliding can recur, leading to long-term impacts on the region's socio-economic activities. "Water drainage boring" is a construction method to remove water from the ground, as the name suggests. While "investigation boring" involves vertical drilling (downward), it is also called "horizontal boring" because it is drilled in a horizontal upward direction. The drilling diameter ranges from 60φ to 90φ, and the drilling length can be as short as 5m or exceed 80m for longer ones. Since the drilling holes would collapse if left as they are, PVC or iron pipes with 4mm holes are regularly arranged and inserted as "hole preservation pipes" down to the bottom of the hole. Water flowing into the holes of these "hole preservation pipes" is directed to an outlet, thereby discharging groundwater to the surface. "Water drainage boring" is a construction method aimed at suppressing the occurrence and reactivation of landslides. *For more details, please refer to the related links or feel free to contact us.
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.
At Hokuto Drill Co., Ltd., we are conducting "borehole (inside casing) cleaning" as a measure to restore the functionality of water collection and discharge effects. We offer a variety of injection nozzles, including the "Front Jet" advanced nozzle that probes the inside of the pipe while blowing water forward, and the "Back Jet" nozzle that blows water backward to discharge residual materials from the pipe. Please feel free to contact us if you have any requests. 【Product Lineup】 ■ FRONT JET Advanced Nozzle ■ BUCK JET Back Jet Nozzle ■ SIDE JET Swivel Nozzle *For more details, please download the PDF or feel free to contact us.
