Wellhead device of platform-shaped dual self-seepage reverse filtration reinjection well

Abstract

The invention discloses a platform-shaped dual-type well head of a self-permeation recharge well with a filter layer, and belongs to the technical field of water retention. The well head comprises a hard well lid, the geotextile invert filter layer and a compression mechanism. The well lid is composed of an upper well lid portion and a lower well lid portion. The well lid is integrally of a hollow bottom-free frustum-shaped column. A long groove formed in the center of the upper well lid portion divides the upper well lid portion into a left platform-shaped dual body and a right platform-shaped dual body which are symmetrical. The outer surface of the left dual body, the outer surface of the right dual body and the bottom of the long groove are respectively provided with a round water inlet. The direction of the long groove is coincident with the water flow direction. The geotextile invert filter layer is arranged on the outer side of the well lid and is matched with the long groove in shape. The compression mechanism comprises a vertical shaft and blades, the blade at the upper end can drive the blade at the lower end to rotate synchronously under action of water flow, the blade at the lower end downwards applies force on water entering the recharge well, and the recharge speed is increased. Under the situation of keeping the boundary dimension of the well head changeless, the discharge capacity and the silt preventing and impact resisting capacity of a recharge pool can be 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 non-pressure groundwater recharge, in particular to a wellhead device of a platform-shaped dual 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-infiltration r...

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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