Well sealing method and well sealing device for ultrahigh-layer high-water-pressure deep precipitation well

Abstract

The invention discloses a well sealing method and a well sealing device for a ultrahigh-layer high-water-pressure deep precipitation well. The method comprises the following steps: a water sealing plate is manufactured according to the inner diameter of a precipitation well; a grouting pipe, a drainage pipe and a sleeve are seamlessly welded on the water sealing plate; when a submersible pump pumps water, the water sealing plate is fully welded in the precipitation well; after welding lines are cooled, the submersible pump is closed, and the grouting pipe, the drainage pipe and the sleeve arequickly blocked to observe if the welding lines generate water seepage; after the welding lines do not generate water seepage, the grouting pipe is opened for high-pressure grouting in the precipitation well, and the drainage pipe is opened for drainage; after thick cement paste overflows from the drainage pipe, the overflowing thick cement paste is sampled to manufacture test blocks, and the drainage pipe is blocked; the grouting pipe grouts with stable pressure to reach a set value; the test blocks are cured by adopting the same conditions of solidification of the thick cement paste in the precipitation well; and after the test blocks achieve the set strength, concrete is cast on the water sealing plate for well sealing. The method is high in well sealing quality, excellent in well sealing efficiency and low in well sealing cost, and achieves energy conservation and environmental protection.

Description

technical field [0001] The invention relates to the field of well sealing technology for deep well dewatering wells, in particular to a well sealing method and well sealing device for super high-rise high water pressure deep well dewatering wells. Background technique [0002] With the development of urban construction, the depth of the basement of the building is increasing, and the foundation pit is getting deeper and deeper. The requirements for the precipitation of the foundation pit are also getting higher and higher. If the water level does not fall below the requirement, the foundation pit is prone to danger. The dewatering well is exactly a well drilled for lowering the groundwater level. After drilling, it is put into a water pump to extract the groundwater to reduce the water level of the groundwater. It is one of the commonly used measures to ensure the smooth construction of the foundation pit. However, for super-high-rise high-pressure deep wells, it is extremel...

AI Technical Summary

Problems solved by technology

[0006] 2. While the water glass glue is coagulating, the water level in the dewatering well will still rise rapidly and under high pressure, which will have a huge impact on the water glass glue, causing the water glass glue to split and segregate and splash on the staff, posing a great safety hazard

[0007] 3. Under the impact of high-pressure water level, the condensation shape of water glass glue is an inverted concave shape with thick sides on both sides and thin center. When there are gaps in the welding of the upper sealing water cover plate, the high-pressure water in the precipitation well cannot be static and will gradually hit the water. The weak point of the glass glue, if it is light, seeps water, and if it is serious, it will break the water sealing cover and gushing water. Since the water glass glue and the water sealing cover have been placed at the wellhead of the precipitation well, it is impossible to add another seal on the top, which is basically a construction operation. No possibility of remediation, poor plugging durability

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