Wellhead device for internal and external water inflow self-seepage reverse filtration recharge well

Abstract

The invention discloses an internal-and-external-inflow well head device of a self-infiltration filtration recharge well and belongs to the technical field of water retention The internal-and-external-inflow well head device of the self-infiltration filtration recharge well comprises a well cover and a geotextile inverted filter layer, and is characterized in that the well cover is composed of an upper well cover portion and a lower well cover portion, the upper well cover portion is shaped in a hollow ring groove and is provided with water inlet orifices, the lower well cover portion which is an impermeable body is buried in the ground of a river bottom or a channel bottom, the well cover is integrally shaped in a hollow bottomless cylinder, the hollow ring groove of the upper well cover portion is provided with a groove bottom, the round water inlet orifices are formed in the outer side of the upper well cover portion, the inner side of the hollow ring groove and the groove bottom, and the geotextile inverted filter layer is arranged on the outer side of the well cover and is identical to the outer side of the well cover and the hollow ring groove in shape. The internal-and-external-inflow well head device of the self-infiltration filtration recharge well has the advantages that on the premise that the outline dimension of the well head device is not changed, flow capacity and silt controlling and anti-impact capabilities of a recharge pool are improved remarkably, and the service life of the recharge pool is prolonged.

Description

technical field [0001] The invention relates to a recharge well for self-seepage type pressureless groundwater recharge, in particular to a wellhead device for self-seepage and reverse filtration recharge of internal and external water, belonging to the technical field of water conservation. Background technique [0002] How to preserve water in some water-deficient areas or how to prevent seawater intrusion caused by over-exploitation of groundwater in coastal areas is a major issue that restricts local people's lives and economic development. The effective use of rainwater resources is also one of the important measures. [0003] In order to make full use of rainwater resources, in seasonal rivers without pollution or slight pollution, a recharge well with the function of filtering granular impurities in water is often arranged, that is, self-seepage recharge well, also known as reverse filtration recharge well , Machine seepage well. The self-infiltration and reverse fi...

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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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