JPS59164854A - Method of ground water collection and return - Google Patents

Abstract

PURPOSE:To prevent abnormal lowering of ground water level and settling of ground by collecting the ground water from a shaft of a well and returning the disposed water to the well after making use of the heat of the ground water. CONSTITUTION:A deep well is drilled in the ground, and a steel pipe 1 is inserted in it. Strainer pipes 2 through which ground water passes are connected respectively at depths of the upper water layer and the lower water layer to form the well. Then, the upper steel pipe 1 and the lower steel pipe 1' are partitioned with a separator 3 at a position in an impermeable layer so that it is closed to prevent the ground water in the layer 7 and in the layer 8 from mixing. A riser 4 for drawing the ground water is extended vertically through the center of the separator 3, and the lower part of the riser 4 is connected to a water pump 5, and the upper part to an area in which the heat is made use of. The water after the heat is made use of is led back into the well through a return pipe 6 so that it can be restituted naturally in the layer 7.

Description

[Detailed Description of the Invention] This invention relates to a groundwater extraction and reduction method, in particular, a method for pumping up groundwater from a well, utilizing the heat of this groundwater, and then returning the water after heat utilization to the well. The present invention relates to a groundwater extraction and reduction method characterized by the following.

In recent years, the population has been concentrated in small areas, and as a result, the demand for water has increased, and the supply has not been able to keep up. Underground water, which is the most familiar source for people, is being exploited in various places, and pollution problems such as abnormal declines in groundwater levels and ground subsidence are occurring.

On the other hand, conventional wells are mostly used only to pump up groundwater, and once the groundwater is pumped up, it is used for various purposes and then discarded as wastewater, and the amount of pumped water far exceeds the amount of natural underground seepage. As mentioned above, this is one of the causes of pollution problems such as abnormal declines in groundwater levels and ground subsidence. However, in order to prevent such pollution problems, surface water, rainwater, etc. are being returned underground, albeit to a small extent. In any case, the use of wells has been limited to one-sided use, either by pumping up groundwater or by injecting surface water, rainwater, etc. underground.

The characteristics of groundwater are: - Since the water temperature, water quality, and water quantity are stable throughout the year, it is used for cooling in industry, heating greenhouses in agriculture, and lightning suppression in road traffic. It is being used to take full advantage of its thermal constant temperature properties. In terms of heat utilization, although there is no water pollution, once used groundwater is discarded from drainage canals into gutters and flows from rivers to the ocean, resulting in lowering of the groundwater level and under ground laws. This will give further impetus to the situation.

Therefore, the purpose of this invention is to extract groundwater from a single well in view of the fact that conventional wells have been used only for one-sided and single-purpose use of groundwater, and there is no way to solve the problem of groundwater pollution. After pumping up and utilizing the heat of this groundwater,
This heat-used water is returned to the above-mentioned well again, making multiple use of a single well, and is characterized by the careful use of valuable groundwater resources.

Other objects, features, configurations, and effects of the present invention will become apparent from the following detailed description along with the accompanying drawings, which illustrate one embodiment of the groundwater collection and reduction method of the present invention.

The drawing shows one of the well facilities that implements the groundwater collection and reduction method of the present invention. Groundwater generally exists between the voids of multiple aquifers under the earth, but it is shown here for convenience. , shown as an upper aquifer and a lower aquifer with an impermeable layer in between. As shown in the drawing, according to the groundwater collection and reduction method of this invention, first a deep well is dug underground.
A strainer pipe through which groundwater passes through is inserted into the upper aquifer 7 and the lower aquifer at a predetermined depth position.
Build a well by connecting them to each other. Next, install the upper iron pipe / and the lower iron pipe l′ at the location of the underground impermeable layer.
are partitioned by an internal partition wall 3 and sealed to prevent the groundwater in the lower aquifer t from mixing with the surface of the underground trees in the upper aquifer. A pumping pipe t for pumping up groundwater extends vertically in the center of the partition wall 3, and the lower part is connected to the pump S, and the upper part is connected to the heat utilization area. Further, the water after being used for heat is guided into the well through the injection pipe 6.

In a well facility that implements the groundwater extraction and reduction method of the present invention, the groundwater passes from the lower aquifer through the gap between the strainer and the pipe, is sucked by the pump 5, and is pumped into the pump pipe. The water is pumped up above ground and sent to the heat utilization area. After performing various heat uses such as snow melting, lightning extinguishing, and greenhouse heating, the water is returned to the upper part of the same well through the injection pipe 3, since the inside of the well is partitioned by a partition wall 3. However, the water does not fall down to the bottom of the 9th well, and is naturally replenished into the upper aquifer.

As described above, according to the groundwater collection and reduction method of the present invention, in various fields of thermal utilization of groundwater, the conventional method of pumping up groundwater and disposing of it, which caused various groundwater pollution problems, can be improved. The contradictory actions of pumping up and returning water can be carried out in a single well, making use of precious groundwater with care, without causing pollution, and preventing abnormal declines in groundwater levels and ground subsidence. It is possible to achieve effects such as making it possible to do the following.

[Brief explanation of the drawing]

The drawings are cross-sectional views showing seven well facilities implementing the groundwater extraction and reduction method of the present invention. In the figure, /, /': Iron pipe, 2-way strainer pipe, 3: Partition wall, lI: Lifting pipe, S
: Lifting pump, B: Injection pipe, 7: Upper aquifer, g: Lower aquifer, q: Impermeable layer.

Claims (1)

[Claims] A groundwater extraction and reduction method characterized by pumping up groundwater through a well, utilizing the heat of this groundwater, and then returning the heat-used water to the well.