Paired wellhead device of infiltration recharge well

Abstract

The invention belongs to the technical field of water retention and discloses a paired wellhead device of an infiltration recharge well. The wellhead device comprises a hard well lid and a geotextile infiltration layer fixedly arranged on the outer side of the well lid, the well lid comprises an upper well lid portion and a lower well lid portion which are in paired arrangement, the upper well lid portion is provided with water inlet orifices, the lower well lid portion is buried below a river bottom ground or a canal bottom ground, the well lid is a hollow bottomless cylinder integrally, and the upper well lid portion is divided into two symmetrical portions by an elongated slot formed in the upper center of the well lid so as to form a left pairing body and a right pairing body. Round water inlet orifices are formed in the surfaces of the left pairing body and the right pairing body and the bottom of the elongated slot, the lower well lid portion is a watertight body, the elongated slot and water flow are the same in direction, and the geotextile infiltration layer is arranged on the outer side of the well lid and is identical to the elongated slot in shape. The paired wellhead device of the infiltration recharge well has the advantages that on the condition that the wellhead device is unchanged in overall dimension, discharge capacity and silt-preventing wash-resistant capacity of a recharge pond can be improved remarkably, and service life of the recharge pond is prolonged.

Description

technical field [0001] The invention relates to a reinjection well for self-seepage pressureless groundwater recharge, in particular to a wellhead device for a dual water-inflow self-permeation 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-infiltration recharge well,...

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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