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Before the excavation of the foundation pit, the engineering precipitation always keeps the groundwater level lower than 500mm below the bottom of the pit, and the methods of engineering precipitation have many forms, such as light vacuum well points, jet well points, tube wells, seepage wells, radiation wells, electroosmotic wells and buried wells, according to the formation soil quality, permeability and precipitation depth of the construction site, the vacuum well point is pumped by pumping the air in the well pipe to form a pressure difference, so it is called a vacuum well point, if the power of vacuum pumping is increased, it is a jet well point, Because the precipitation depth of the vacuum well point is 6m and the multi-stage is 12m, the jet well point increases the power on the basis of the vacuum well point to increase the precipitation depth to 20m, and the buried well point is a shrunken version of the vacuum well point, which reduces the length of the well pipe, resulting in the precipitation depth of less than 2m, the precipitation principle of the tube well is to increase the diameter of the well pipe and put the submersible pump into the well pipe to pump water, the precipitation depth is not limited, if the soil permeability of the formation around the tube well is low, the surrounding groundwater recharge rate is slow after precipitation, Then increase the flow speed of the surrounding groundwater to the tube well by applying the horizontal filter pipe in the filter pipe part, this is the principle of radiation wells, and the electroosmosis is also used for this low permeability formation, so that the groundwater with a negative charge accelerates the flow to the precipitation well pipe through electrification, and the seepage well is to drive the well pipe into the formation, and the water in the foundation pit is introduced into the ground, the above is the principle of different forms of well point precipitation, we mainly learn vacuum well point precipitation and tube wells, we are learning for the exam, and we must simplify the understanding of the knowledge points. If you want to increase your knowledge of municipal theory, you can study it comprehensively after passing the exam.
Vacuum well point
Jet well points
tube well
Yui-hsien
Chinjai
Electroosmosis wells
Buried wells
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