Wellhead device for self-seepage, reverse filtration, and back-injection wells

Abstract

The invention relates to a wellhead of a frustum-shaped internal-external water-inflow permeable inverted-filtering recharge well and belongs to the technical field of water retention. The wellhead comprises a well lid, a geotextile inverted filter and a pressurizing mechanism, the well lid is composed of a well lid top and a well lid bottom, the well lid top is arranged as a hollow-core annulus groove and provided with water inlet orifices, the well lid bottom is buried under a river bottom or trench bottom ground, the well lid is integrally a hollow-core bottomless frustum, and the hollow-core annulus groove arranged in the center of the well lid top is a cube-shaped groove with a groove bottom. The round water inlet orifices are arranged in the outer side of the well lid top, the inner side of the hollow-core annulus groove and the groove bottom. The well lid bottom is an impermeable body. The geotextile inverted filter is arranged on the outer side of the well lid and fits the outer side of the well lid and the hollow-core annulus groove in shape. The pressurizing mechanism comprises a vertical shaft and blades. Under the condition that the appearance and the size of the wellhead device are unchanged, flow capacity and silt prevention and antiseep capacity of a recharge pool can be improved obviously, service life of the recharge pool is prolonged, recharge is quickened, and recharge efficiency is improved beneficially.

Description

technical field [0001] The invention relates to a recharge well for self-seepage type non-pressure groundwater recharge, in particular to a wellhead device for a table-shaped inner and outer water inlet self-seepage reverse filtration recharge well, which belongs to the technical field of water conservation. Background technique [0002] How to preserve water in some water-deficient areas or how to prevent seawater backflow caused by excessive exploitation of groundwater in coastal areas is a major issue that restricts local people's life and economic development. The means to solve this issue are to strengthen people's awareness of water conservation. Effective use of rain and flood resources is also one of the important measures. [0003] In order to make full use of rain and flood resources, in seasonal rivers with no pollution or slight pollution, a kind of recharge well with the function of filtering particulate impurities in water is often arranged, that is, self-infil...

AI Technical Summary

Problems solved by technology

However, the problems of this self-seepage-recharge well are: 1. The self-seepage-recharge well is placed at the bottom of the river or the bottom of the canal, which is very easy to be silted up and washed away by the water flow, which affects the service life; 2. The recharge tank is buried in Underground, there is only a free water inlet section on the top of the recharge tank. In order to ensure sufficient recharge volume, the recharge tank requires a large cross-sectional area and a large amount of construction; 3. To build an ordinary recharge tank requires backfilling 10m 3 Left and right sand and gravel consume a lot of building materials; 4. The use of concrete manhole covers affects the amount of recharge; 5. Only the top surface can enter water, and the recharge capacity of the recharge well is low

[0005] However, since most of the rainfall is showers, the time for rainwater to flow in the river is short, and the permeable holes on the roof and side walls cannot meet the needs of recharge. However, the size of the permeable hole increases, which not only reduces the strength of the wellhead device, but also puts forward higher requirements for the strength of the geotextile filter layer, otherwise the impact of sand on the geotextile filter layer will easily damage the geotextile. The fabric filter layer, the sand and stone entering the reinjection well will reduce the water seepage function of the reinjection well; some technicians also try to increase the number of permeable holes in the wellhead device, and increasing the number of permeable holes will inevitably reduce the size of the permeable holes, although It can solve the strength problem of the wellhead device, but the overall reinjection volume is reduced; therefore, improving the reinjection volume and ensuring the strength and reliability of the wellhead device in this field have always been the bottleneck affecting the scale development of self-infiltration reinjection wells

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