Precipitation well blocking method

Abstract

The invention relates to the technical field of engineering construction, solves the problem that in the prior art, a precipitation well is not prone to being blocked, and particularly discloses a precipitation well blocking method. Multiple pieces of water absorption resin are put into the precipitation well to form a water absorption layer, and water in the precipitation well is converted into colloid through a coagulant; the characteristics of the colloid are utilized to settle sand grains and broken stones in the water, so that the quicksand phenomenon is reduced; when the colloid is adsorbed on the inner wall of the precipitation well, some sand grains, broken stones and water absorption resin can be adsorbed on the inner wall, so that the quicksand phenomenon is further inhibited, and water seepage can be reduced; and a mixture and a pre-blocking material are added into the precipitation well in sequence and are tamped in sequence, so that the water absorption resin expands to the periphery, soil on the side edge of the precipitation well is extruded and tamped, the density of the precipitation well is improved, the water permeability is reduced, the mixture is prevented from losing efficacy, and a relatively dry environment can be provided for final blocking.

Description

technical field [0001] The invention relates to the technical field of engineering construction, in particular to a method for plugging a dewatering well. Background technique [0002] A precipitation well is a well drilled for precipitation, and the groundwater is drawn through a water pump to reduce the water level of the groundwater; in the construction of underground structures, it is a common precipitation facility, such as: deep foundation pit (or basement) construction often In case of water seepage or water gushing, in order to ensure dry land construction, dewatering wells are generally used to lower the groundwater level within the construction range, so as to ensure normal construction outside the dewatering well range. After the construction is completed, the dewatering well needs to be blocked. [0003] During the construction, it was found that since the pouring of the plugging concrete cannot be carried out with water, the final pouring of the plugging concre...

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Problems solved by technology

[0003] During the construction, it was found that since the pouring of the plugging concrete cannot be carried out with water, the final plugging concrete pouring can only be carried out under the condition of completely controlling the accumulated water. Strengthen the vibration quality at the same time to avoid internal holes, but the underground soil layer is under the action of the groundwater head and the quicksand phenomenon. The quicksand phenomenon refers to when the excavated soil of the foundation pit reaches below the groundwater level, and the soil is fine sand or silt. When a sump is used for dewatering, under a certain dynamic water pressure, the soil under the pit will form a flowing state, and flow into the pit together with the groundwater. The phenomenon that occurs is called the quicksand phenomenon; and it is easy to cause filling after filling. Soil seepage, subsequent pouring of concrete for sealing is very difficult, and in the rainy season or when it is close to the water source, the groundwater is more permeable, which makes the quicksand phenomenon more serious, and the subsoil is more loose, which further makes the sealing more difficult

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