Method for constructing water injection well

Abstract

A water injection well with an expanded filter layer built in a building method for water injection well is characterized in that the forming of the expanded filter layer enlarges the seepage area of the lower bottom of the well such that rain water infiltrate down fast to reach the aim of rain water quick recirculation from the ground surface to the underground. Further, the building method for water injection well is characterized in that the well body is expanded with a high speed water gun at the part of well 2-30 meters away from the ground surface. Gravel stratum is expanded with a highpressure water gun, leading the gravels in expanded part to sink into a burying area so as to form a large scale ellipsoidal collapse pit on the bottom of the well. After the well construction, quartz sands are used to refill the expanded filter layer. The filling step in the building method for water injection well of the invention makes use of a straight-through cloth barrel with two open ends to directly transfer the quartz sands to the expanded filter layer from a filling bag such that the quartz sands in the filling process does not bring soil of mud layers to the bottom. The building method for water injection well is applicable to the occasion requiring fast rain water infiltration.

Description

technical field [0001] The invention relates to a construction method of a water injection well, which uses a brand-new technology to expand the interior of the water injection well, increases the infiltration area of ​​the water injection well, and achieves the effect of rapid infiltration. Background technique [0002] The water injection well is a simple and practical device for injecting water into the ground. The basic construction method of a traditional water injection well is: drill a well body with a drilling rig, bury a PVC pipe in the well body, and fill in sand and gravel around it, or use steel pipes and concrete to protect the well. It is used to infiltrate the surface to collect confluent rainwater during the rainy season, conserve groundwater, reduce the pressure of waterlogging caused by difficult drainage in cities or regions, eliminate flood peaks, and reduce flood disasters in rainy seasons. [0003] There are several problems in traditional water inject...

AI Technical Summary

Problems solved by technology

[0003] There are several problems in traditional water injection wells: 1. The filtration area is small and the infiltration speed is slow, which is difficult to meet the purpose of rapid infiltration of rainwater in the rainy season

2. The dirt-holding capacity is small and the service life is low. Generally, after 1 to 2 years of water seepage, it is difficult to meet the original design water seepage requirements

3. Rainwater filtration may not be complete and may pollute the groundwater layer

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