Wellhead device for circular inner and outer water self-seepage reverse filtration recharge well

Abstract

A wellhead device for a round inside and outside water inflow self-infiltration inverted filter recharge well belongs to the technical field of water retention. The wellhead device comprises a well lid, a geotextile inverted filter layer and a pressing mechanism, the well lid is composed of a well lid upper portion and a well lid lower portion, the well lid upper portion is provided with water inlet holes arranged in a mode of a hollow ring-shaped groove, the well lid lower portion is buried at the bottom of a river or underground, the well lid is a hollow bottomless cylinder on the whole, the center of the well lid upper portion is provided with a hollow ring-shaped groove which is a cylinder with a groove bottom; the outside of the well lid upper portion, the inside of the hollow core ring-shaped groove and the groove bottom are all provided with round water inlet holes; the well lid lower portion is a water-impermeable body; the geotextile inverted filter layer is arranged outside the well lid and is matched with the shape of the outside of the well lid and the hollow ring-shaped groove. The wellhead device for the round inside and outside water inflow self-infiltration inverted filter recharge well can evidently improve discharge capacity and slit-prevention and antishock capacity of a recharge pond under the condition that a boundary dimension of the wellhead device is unchanged, prolong service life of the recharge pond and remarkably improve recharge speed and efficiency.

Description

technical field [0001] The invention relates to a recharge well for self-permeable pressureless groundwater recharge, in particular to a circular wellhead device for self-permeable reverse filtration recharge wells with internal and external water inflow, and 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-i...

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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