CN110144993A - A water filter pipe, groundwater monitoring well device and construction method - Google Patents

Abstract

According to a water filter pipe, groundwater monitoring well device and construction method of the present invention, the water filter pipe is arranged at the bottom of the groundwater sampling well, including a pipe body, having an upper part of the pipe wall and a lower part of the pipe wall, and the lower part of the pipe wall is provided with a plurality of through holes; At least one filter layer wrapping the lower part of the pipe wall; and the water stop ring is arranged around the upper part of the pipe wall, the size of the filter hole in the filter layer is smaller than the size of the through hole, and the water stop ring is made of water-swellable material. Because the water filter pipe of the present invention is arranged at the bottom of the groundwater sampling well for water quality detection of groundwater in a specific formation, the water filter pipe has at least one filter layer wrapped on the pipe body for filtering soil particles and suspended matter, There is no need to fill the filter layer between the filter pipe and the well wall, which not only saves material and transportation labor costs, but also facilitates the removal of the used groundwater well without affecting the subsequent development of the site.

Description

A water filter pipe, groundwater monitoring well device and construction method

technical field

The invention belongs to the field of environmental protection, and in particular relates to a novel water filter pipe, a groundwater monitoring well device and a construction method.

Background technique

With the rapid development of site environmental investigation, groundwater environmental investigation and restoration, the construction efficiency, technical requirements and economical efficiency of groundwater monitoring wells and extraction wells are getting higher and higher.

The traditional well construction method is generally to drill the well first to obtain the well hole, then place the well pipe and the water filter pipe, then fill the filter layer between the water screen pipe and the well wall, fill the sealing layer between the well pipe and the well wall, and finally install the wellhead protection cover , to complete the construction of the well.

In the investigation and remediation of polluted sites and groundwater environments, due to the large number of wells, short working hours, and many specific requirements, the above-mentioned well construction method has relatively low work efficiency, and because the well construction requires the use of filter layer filter materials, the operation is relatively complicated , the cost of well construction is also high; in addition, the traditional well construction method monitoring wells have been left in the site, it is difficult to remove, and it has a negative impact on the subsequent use of the site when the number is large.

Patent CN107816083A discloses an underground filter layer module. The filter layer is filled between the inner filter screen and the outer filter screen arranged on the fixed frame, so that a dense and regular filter layer can be formed around the permeable well pipe of the water well, and the filter layer can be avoided. The layer shift causes the disadvantage of entering the sediment waste water well. The downhole filter layer module of this patent not only has slow well construction efficiency, but also needs to excavate a large diameter hole.

Contents of the invention

In order to simplify the well construction process, improve the well construction efficiency and facilitate the subsequent use of the site, the invention provides a novel water filter pipe, a groundwater monitoring well device and a construction method.

The invention provides a water filter pipe, which is arranged at the bottom of a groundwater sampling well and is used for monitoring the water quality of groundwater in a specific stratum. The lower part of the pipe wall is provided with a plurality of through holes; at least one filter layer wrapped around the lower part of the pipe wall; and the water stop ring is arranged around the upper part of the pipe wall, wherein the size of the filter holes in the filter layer is smaller than that size, the water stop ring is made of a material that swells when exposed to water.

In the water filter pipe provided by the present invention, it may also have such a feature: wherein, the centerline of the through hole is perpendicular to the centerline of the pipe body, or the angle between the centerline of the through hole and the centerline of the pipe body in the downward direction is an acute angle, or, the angle between the centerline of the through hole and the upward direction of the centerline of the pipe body is an acute angle.

In addition, in the water filter pipe provided by the present invention, it may also have such a feature: wherein, the lower part of the pipe wall includes an upper wall part, a middle wall part and a lower wall part from top to bottom, and the plurality of through holes include respectively setting the upper wall The upper through hole on the part, the middle through hole on the middle wall part and the lower through hole on the lower wall part, the angle between the center line of the upper through hole and the downward direction of the center line of the pipe body is an acute angle, and the middle through hole The centerline of the hole is perpendicular to the centerline of the pipe body, and the angle between the centerline of the lower through hole and the upward direction of the centerline of the pipe body is an acute angle.

In addition, in the water filter pipe provided by the present invention, it is characterized in that it also includes an anti-blocking layer with a mesh structure, which is arranged around the lower part of the pipe wall and is located between the pipe wall and the filter layer, for supporting the filter layer and preventing the passage of the filter layer. Pore blockage, wherein the filter layer has multiple layers, the multi-layer filter layer has the same filter hole shape, the filter hole positions in two adjacent filter layers are staggered, or the multi-layer filter layer is composed of multiple different The filter layer is composed of filter hole shapes, and multiple filter layers with different filter hole shapes are intersected, and the filter layers are made of low adsorption stainless steel or organic polymer materials.

The invention provides a groundwater monitoring well device, which is used to be installed in a groundwater sampling well, and after filtering the groundwater in a specific formation, obtain the groundwater in a specific formation that needs to be monitored. It has such characteristics, including: from top to bottom A plurality of tubular well pipes and filter pipes connected in sequence, wherein the water filter pipe is arranged at the bottom of the groundwater sampling well, the bottom of the well is located in a specific formation, and the water filter pipe is any one of the above-mentioned water filter pipes.

The invention provides a groundwater monitoring well device, which is used to be installed in a groundwater sampling well, and after filtering the groundwater in a specific formation, obtain the groundwater in a specific formation that needs to be monitored. It has such characteristics, including: from top to bottom A plurality of cylindrical well pipes and water filter pipes, anti-blocking layers and water stop rings connected in sequence, wherein the water filter pipes are arranged at the bottom of the groundwater sampling well, and the bottom of the well is located in a specific formation. The water filter pipes include: cylindrical The pipe body has a pipe wall with a plurality of through holes, at least one filter layer wrapped on the pipe wall, the size of the filter holes in the filter layer is smaller than the size of the through hole, and has a mesh structure for anti-blocking The layer is arranged on the pipe wall and is located between the pipe wall and the filter layer, which is used to support the filter layer and prevent the through hole from being blocked. Made of water-swellable material.

In the groundwater monitoring well device provided by the present invention, it can also have such a feature: wherein, the centerline of the through hole is perpendicular to the centerline of the pipe body, or the centerline of the through hole is perpendicular to the downward direction of the pipe body centerline. The included angle is an acute angle, or the included angle between the centerline of the through hole and the upward direction of the centerline of the pipe body is an acute angle.

In addition, in the groundwater monitoring well device provided by the present invention, it may also have such a feature: wherein, the pipe wall includes an upper wall part, a middle wall part and a lower wall part from top to bottom, and a plurality of through holes include upper The upper through hole on the wall part, the middle through hole on the middle wall part and the lower through hole on the lower wall part, the angle between the center line of the upper through hole and the center line of the pipe body in the downward direction is an acute angle, and the middle The center line of the through hole is perpendicular to the center line of the pipe body, and the angle between the center line of the lower through hole and the center line of the pipe body in the upward direction is an acute angle.

In addition, in the groundwater monitoring well device provided by the present invention, it can also have such a feature: wherein, the filter layer has multiple layers, and the multi-layer filter layers have the same filter hole shape, and the filter hole positions in two adjacent filter layers It is staggered, or the multi-layer filter layer is composed of multiple filter layers with different filter hole shapes, and the multiple filter layers with different filter hole shapes are cross-set, and the filter layer is made of low adsorption stainless steel or organic Made of polymer materials.

A modular groundwater monitoring well construction method is characterized in that it comprises the following steps:

Select the location of the groundwater monitoring well, select the appropriate drilling method according to the geological structure of the soil layer, and start the drilling operation of the monitoring well. When the depth is below the predetermined depth, the drilling operation of the monitoring well hole is completed; multiple well pipes and filter pipes are connected in sequence, and the water stop ring is attached to the outer wall of the well pipe to assemble the groundwater monitoring well device; the groundwater monitoring The well device is placed in the monitoring well; the wellhead protection cover is installed to complete the rapid construction of the groundwater monitoring well device.

Function and Effect of Invention

According to the water filter pipe, groundwater monitoring well device and construction method involved in the present invention, because the water filter pipe of the present invention is arranged at the bottom of the groundwater sampling well, it is used to monitor the water quality of groundwater in a specific formation, and the water filter pipe has at least one The filter layer wrapped on the pipe body is used to filter soil particles and suspended solids without filling the filter layer between the filter pipe and the well wall, which not only saves material and transportation labor costs, but also facilitates the The used groundwater wells will be removed without affecting the subsequent development of the site.

In addition, the groundwater monitoring well device is connected with multiple well pipes and filter pipes made of modularization, which is not only convenient for assembly and installation, but also the well pipes and water filter pipes can be retrieved after the monitoring well is used up, and can be recycled after treatment.

Further, the water-stop ring arranged between the well pipe and the well wall of the sampling well expands with water to seal the gap between the well pipe and the well wall of the sampling well, and the groundwater under the water-stop ring passes through the filter layer from the outside of the pipe. It flows into the pipe body, so there is no need to fill the sealing layer between the well pipe and the well wall, and it also has the beneficial effect of reducing groundwater disturbance.

Therefore, the groundwater monitoring well device of the present invention can not only effectively simplify the well construction process, improve the well construction efficiency, and shorten the well construction time, but also the well pipe and the water filter pipe can be removed conveniently, and can be recycled after treatment.

Description of drawings

Fig. 1 is the schematic diagram of groundwater monitoring well device in the embodiment of the present invention;

Fig. 2 is a schematic diagram of a water filter pipe body in an embodiment of the present invention;

3 is a schematic cross-sectional view of a through hole in an embodiment of the present invention;

4 is a schematic cross-sectional view of a through hole in an embodiment of the present invention;

Fig. 5 is a schematic view of the filter layer in an embodiment of the present invention; and

Fig. 6 is a schematic diagram of an anti-blocking layer in an embodiment of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the following embodiments will specifically describe the water filter pipe, groundwater monitoring well device and construction method of the present invention in conjunction with the accompanying drawings.

Embodiment one

The groundwater monitoring well device is used to be installed in the groundwater sampling well, and after filtering the groundwater in a specific formation, the groundwater in a specific formation that needs to be monitored is obtained.

As shown in FIG. 1 , the groundwater monitoring well device includes a plurality of cylindrical well pipes 7 , water filter pipes 11 , water stop rings 10 , wellhead protection covers 6 , and sampling well covers 8 connected sequentially from top to bottom.

The well pipe 7 is cylindrical, and its outer diameter is smaller than the inner diameter of the groundwater sampling well. Two adjacent well pipes 7 are connected by threaded connection or buckle connection. In the embodiment, the well pipe 7 is made of PVC material. 3 A section of about one meter, using threaded connection. When threaded connection is adopted, the upper end of the well pipe 7 is provided with an internal thread, and the outer diameter of the connection at the lower end is reduced and an external thread matching the internal thread is provided.

In addition, a connecting piece can also be used to connect two adjacent well pipes 7, and the two ends of the well pipe 7 are respectively provided with external threads, the connecting piece is in the shape of a ring, and an internal thread matching the external thread is provided inside the ring.

In the embodiment, the well pipe 7 and the filter pipe 11 are also assembled by threaded connection, and put together into the sampling well, thereby improving the well construction efficiency. The wellhead protection cover 6 is arranged on the uppermost well pipe 7, and the sampling well cover 8 is arranged in a ring shape. On the ground, the well pipe 7 passes through the sampling well cover 8, and the sampling well cover 8 is used to block the gap between the well pipe 7 and the well wall of the sampling well.

The water filter pipe 11 is arranged at the bottom of a groundwater sampling well in a specific formation at a predetermined depth, including a cylindrical pipe body 3, at least one filter layer 4, and an anti-blocking layer 5. The length of the water filter pipe 11 is set according to the hydrogeological structure and water intake requirements. , usually 100mm-20000mm.

The tube body 3 is a cylindrical tube body with a tube wall on which a plurality of through holes 2 are arranged. The bottom of the tube body 3 may or may not be closed. In the embodiment, the bottom of the tube body 3 is closed.

As shown in Figure 2, the upper end of the pipe body 3 is provided with an internal thread 1, and the pipe wall of the pipe body 3 is provided with a plurality of through holes 2, and the cross section of the through holes 2 can be circular, oval or elongated. any kind.

The direction of the through hole 2 is designed according to different pollutants in the groundwater. In one case, the centerline of the through hole 2 is perpendicular to the centerline of the pipe body 3, so that the direction of water flow through the through hole 2 is perpendicular to the centerline of the pipe body 3. .

Alternatively, the downward angle between the centerline of the through hole 2 and the centerline of the pipe body 3 is an acute angle.

When the water flow direction A passes through the through hole 2 as shown in Figure 3, it is suitable for the groundwater containing oil, because the oily substance is easy to float up and pass through this kind of hole easily.

Alternatively, the upward angle between the centerline of the through hole 2 and the centerline of the pipe body 3 is an acute angle.

When the water flow direction B passes through the through hole 2 as shown in FIG. 4 , it is suitable for heavy non-aqueous phase liquid pollutants to pass through this kind of through hole.

When the acute angle is 45 degrees, the flow of water has a better effect.

Further, the through hole 2 is in the shape of a circular arc at the edge of the pipe wall, that is, the connection between the through hole 2 and the pipe wall is in a circular arc shape, so that it is not easy for the suspended matter in the groundwater to deposit at the connection.

In this embodiment, the pipe body 3 is cylindrical and made of PVC material. The cross-sectional size of the pipe body 3 is the same as that of the well pipe 7. The centerline of the through hole 2 is perpendicular to the centerline of the pipe body 3. The cross section of the hole 2 is in the shape of a long strip, and the long strips can be cut horizontally on the pipe body 3 with an electric saw, and the intervals between the long strips are parallel and staggered. The length of the long slit is 30mm-120mm, the width is 0.15-3mm, and the spacing is 3mm-12mm.

At least one filter layer 4 as shown in FIG. 4 is wrapped on the pipe wall of the pipe body 3 , and the size of the filter holes in the filter layer 4 is smaller than the size of the through hole 2 .

Wherein, filter layer 4 has multiple layers,

The multi-layer filter layers 4 have the same shape of filter holes, and the positions of the filter holes in two adjacent filter layers 4 are staggered;

Alternatively, the multi-layer filter layer 4 is composed of a plurality of filter layers 4 with different filter hole shapes, and the plurality of filter layers 4 with different filter hole shapes are arranged crosswise.

According to the hydrogeology and water intake requirements of the water intake layer, the filter layer 4 can have 5-20 layers. The filter layer 4 is made of low adsorption stainless steel or organic polymer material.

In the embodiment, the filter layer 4 is wrapped by filter cloths with the same shape of multi-layer filter holes, or wrapped by filter cloths with different shapes of multi-layer filter holes. Organic polymer materials, such as any one of polyester, polypropylene, nylon (nylon), vinylon, polyethylene, mixed fibers, and resins.

The shape of the filter holes in the filter cloth can be rectangular, rhombus, etc. The shapes of the filter holes of each layer of filter cloth can be the same, and the positions of the filter holes in two adjacent filter layers 4 are alternately arranged.

Alternatively, the shapes of the filter holes of each layer of filter cloth may also be different, and a plurality of filter layers 4 with different filter hole shapes are intersected.

The filter layer 4 after multi-layer stacking can obtain smaller filter holes, and can perform the filtering function more effectively.

In the embodiment, the pores of the filter cloth are divided into three specifications: coarse, medium and fine, and their mass per unit area are 100g/m ² , 450g/m ² , 800g/m ² respectively, and their equivalent pore diameters are 0.2mm, 0.14 mm, 0.07mm, under the normal temperature of groundwater (15-17 degrees Celsius), the filter cloth material is insoluble and organic pollutants, and acid and alkali resistant.

Therefore, the size of the filter holes in the filter layer 4 is smaller than the size of the through holes 2, that is, the largest size of the equivalent pore diameters of the filter layer 4 is smaller than the smallest size of the through holes 2.

In order to avoid fouling of the through hole 2 , an anti-blocking layer 5 is arranged between the pipe body 3 and the filter layer 4 .

The anti-blocking layer 5 with a net-like structure is arranged around the pipe wall and is located between the pipe wall and the filter layer 4 for supporting the filter layer 4 and preventing the through holes 2 from being blocked.

The anti-blocking layer 5 has the functions of supporting and isolating anti-blocking. As shown in FIG. 6 , the anti-blocking layer 5 is provided with a plurality of through holes. In the embodiment, an anti-blocking layer 5 made of a plastic mesh is used to separate the filter layer 4 from the outer wall of the pipe body 3 .

The water stop ring 10 is arranged around the lower end of the outer surface of the well pipe 7 located on the upper part of the water filter pipe 11, and is located between the well pipe 7 and the well wall of the sampling well.

As shown in Figure 1, the water stop ring 10 is arranged on the well pipe 7, and the water stop ring 10 is made of a rubber material that expands when encountering water. The expansion coefficient of the rubber material is 1.5-3, and there is no secondary pollution; or use a water permeable material It is made and wrapped with bentonite after physical and chemical modification in the water-permeable material. The bentonite has good water-swellability at a pH of 2-13, and the expansion coefficient is 0.5-1.5. It is light in weight and has good plasticity. No secondary pollution.

In the embodiment, the water stop ring 10 is made of water-swellable rubber material, and the water stop ring 10 is connected to the well pipe 7 by bonding.

The water-swelling water-stop ring 10 is similar to the sealing layer in the traditional well construction method, and expands after encountering water to play the effect of water-stopping. The water-stop ring 10 expands in case of water to block the gap between the well pipe 7 and the well wall of the sampling well, and the groundwater below the water-stop ring 10 flows into the pipe body 3 from the outside of the pipe body 3 through the filter layer 4 .

The installation method of the water stop ring 10 is simple and convenient, which can effectively improve the well construction efficiency. In addition, the water-swelling water-stop ring 10 will shrink slowly after being dehydrated. After the monitoring well is used, the well pipe can be removed conveniently, which facilitates its retrieval, and can be recycled after treatment, saving cost.

A method for constructing a modular groundwater monitoring well, comprising the following steps:

Select the location of the groundwater monitoring well, select the appropriate drilling method according to the geological structure of the soil layer, and start the drilling operation of the monitoring well. The diameter of the monitoring well is greater than the sum of the outer diameter of the well pipe and the thickness of the two water stop rings;

When drilling to a predetermined depth below the water intake layer, the drilling operation of the monitoring wellbore is completed;

Connect multiple well pipes and filter pipes in sequence, and attach the water stop ring to the outer wall of the well pipe to assemble the groundwater monitoring well device;

Place the groundwater monitoring well device in the monitoring well;

The wellhead protection cover is installed to complete the rapid construction of the groundwater monitoring well device.

Embodiment two

The other structures of this embodiment are the same as those of the first embodiment, except that the body structure of the filter pipe is different from that of the first embodiment.

In this embodiment, the tube body is a cylindrical tube body with a tube wall, and a plurality of through holes are arranged on the tube wall, and the bottom of the tube body may or may not be closed. In an embodiment, the bottom of the tube is closed.

Wherein, the pipe wall includes an upper wall part, a middle wall part and a lower wall part from top to bottom,

The plurality of through holes include an upper through hole disposed on the upper wall portion, a middle through hole disposed on the middle wall portion, and a lower through hole disposed on the lower wall portion.

The angle between the centerline of the upper through hole and the downward direction of the centerline of the pipe body is an acute angle.

The centerline of the through hole is perpendicular to the centerline of the pipe body.

The angle between the centerline of the lower through hole and the upward direction of the centerline of the pipe body is an acute angle.

Embodiment three

The other structures of this embodiment are the same as those of the first embodiment, except that the structure of the filter pipe and the installation position of the water stop ring are different from those of the first embodiment.

The water filter pipe includes a pipe body, at least one filter layer and a water stop ring.

The cylindrical pipe body has a pipe wall, including an upper part of the pipe wall and a lower part of the pipe wall, and the lower part of the pipe wall is provided with a plurality of through holes;

At least one filter layer is wrapped around the lower part of the pipe wall;

The water stop ring is arranged around the upper part of the pipe wall and is located between the well pipe 7 and the well wall of the sampling well.

Wherein, the center line of the through hole is perpendicular to the center line of the pipe body,

Alternatively, the downward angle between the centerline of the through hole and the centerline of the pipe body is an acute angle,

Or, the angle between the centerline of the through hole and the upward direction of the centerline of the pipe body is an acute angle.

Embodiment four

The other structures of this embodiment are the same as those of the third embodiment, except that the structure of the pipe body is different from that of the third embodiment.

In this embodiment, the lower part of the tube wall includes an upper wall part, a middle wall part and a lower wall part from top to bottom.

The plurality of through holes include an upper through hole disposed on the upper wall portion, a middle through hole disposed on the middle wall portion, and a lower through hole disposed on the lower wall portion.

The angle between the centerline of the upper through hole and the downward direction of the centerline of the pipe body is an acute angle.

The centerline of the through hole is perpendicular to the centerline of the pipe body.

The angle between the centerline of the lower through hole and the upward direction of the centerline of the pipe body is an acute angle.

Example 1

In view of the possible impact of a tailings pond on the groundwater environment in the surrounding area, it is necessary to conduct a groundwater environment investigation. According to the characteristics of the tailings, it is inferred that the possible main pollutants in the groundwater include sulfate radicals and heavy metal ions. According to the geological exploration results of the site, the strata of the site from top to bottom are miscellaneous fill, gravel sand, strongly weathered granite, and moderately weathered granite. The groundwater of the site mainly exists in the gravel sand layer, and the grain size of the gravel sand is 2mm-5mm. Groundwater environment investigation needs to establish a groundwater monitoring well for sampling and detection. After confirming that there are no underground facilities at the drilling point, according to the method of this patent, take a 25m deep water well as an example, drill a hole as deep as 25m, and assemble a new type of PVC water filter pipe 18m and a new type of PVC The well pipe is 7.5m and put into the well with a pipe diameter of 100mm. According to the pollutants that may exist in the groundwater and the particle size of the gravel, the filter cloth is selected with a specification of 100g/m ² and wrapped in 5 layers. The length of the water leakage crack is 80mm, the width is 2mm, and the distance is 4mm. Install the wellhead protection cover and ring to complete the well construction.

Example 2

In view of the possible impact of a pesticide factory on the groundwater environment in the surrounding area, it is necessary to conduct a groundwater environment investigation. According to the production process of the pesticide factory, it is inferred that the possible main pollutants in the groundwater include organophosphorus pesticides and organochlorine pesticides. The groundwater on the site mainly exists in the silt layer, and the silt particle size is 0.02mm-0.05mm. Groundwater environment investigation needs to establish a groundwater monitoring well for sampling and detection. After confirming that there are no underground facilities at the drilling point, according to the method of this patent, take a 25m deep water well as an example, drill a hole as deep as 25m, and assemble a new type of PVC water filter pipe 18m and a new type of PVC The well pipe is 7.5m and put into the well with a pipe diameter of 100mm. According to the pollutants that may exist in groundwater and the particle size of silt, the filter cloth is selected with a specification of 800g/m ² and wrapped in 10 layers. The leaking cracks have a length of 12mm, a width of 1mm, and a spacing of 5mm. Install the wellhead protection cover and ring to complete the well construction.

The present embodiment has only described two examples of the monitoring well construction of groundwater inorganic pollution and organic pesticide pollution sampling, but the present invention is not limited thereto, and those skilled in the art should know that can be obtained without departing from the scope of claims of the present invention. make any changes and modifications.

Function and effect of embodiment

According to the water filter pipe, groundwater monitoring well device and construction method involved in this embodiment, because the water filter pipe of the present invention is arranged at the bottom of the groundwater sampling well, it is used to monitor the water quality of groundwater in a specific formation, and the water filter pipe has at least one layer. The filter layer wrapped on the pipe body is used to filter soil particles and suspended solids, without filling the filter layer between the filter pipe and the well wall, which simplifies the well construction process and saves material and transportation labor costs.

In addition, the groundwater monitoring well device is connected with multiple well pipes and filter pipes made of modularization, which is not only convenient for assembly and installation, but also the well pipes and water filter pipes can be retrieved after the monitoring well is used up, and can be recycled after treatment.

Further, the water-stop ring arranged between the well pipe and the well wall of the sampling well expands with water to seal the gap between the well pipe and the well wall of the sampling well, and the groundwater under the water-stop ring passes through the filter layer from the outside of the pipe. It flows into the pipe body, so there is no need to fill the sealing layer between the well pipe and the well wall, and it also has the beneficial effect of reducing groundwater disturbance.

Further, due to the structure of the groundwater monitoring well device, the inner diameter of the groundwater sampling well needs to be drilled to be small, which saves costs.

Therefore, the groundwater monitoring well device of this embodiment can not only effectively improve the efficiency of well construction and prevent the filter layer from blocking the water filter pipe, but also the well pipe and the water filter pipe can be recycled after treatment.

The above embodiments are preferred examples of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (10)

1. A water filter pipe is arranged at the bottom of a groundwater sampling well, and is used for water quality detection of groundwater in a specific formation, characterized in that, comprising: A cylindrical pipe body with a pipe wall, including an upper part of the pipe wall and a lower part of the pipe wall, and the lower part of the pipe wall is provided with a plurality of through holes; at least one filter layer wrapped around the lower part of the pipe wall; and A water stop ring is arranged around the upper part of the pipe wall, Wherein, the size of the filter holes in the filter layer is smaller than the size of the through holes, The water stop ring is made of water-swellable material. 2. The water filter pipe according to claim 1, characterized in that: Wherein, the centerline of the through hole is perpendicular to the centerline of the pipe body, Alternatively, the angle between the centerline of the through hole and the centerline of the pipe body in the downward direction is an acute angle, Alternatively, the angle between the centerline of the through hole and the upward direction of the centerline of the pipe body is an acute angle. 3. The water filter pipe according to claim 1, characterized in that: Wherein, the lower part of the pipe wall includes an upper wall part, a middle wall part and a lower wall part from top to bottom, The plurality of through holes include an upper through hole provided on the upper wall part, a middle through hole provided on the middle wall part and a lower through hole provided on the lower wall part, The angle between the centerline of the upper through hole and the downward direction of the centerline of the pipe body is an acute angle, The centerline of the through hole is perpendicular to the centerline of the pipe body, The angle between the centerline of the lower through hole and the upward direction of the centerline of the pipe body is an acute angle. 4. The water filter pipe according to claim 1, characterized in that: It also includes an anti-blocking layer with a mesh structure, which is arranged around the lower part of the pipe wall and is located between the pipe wall and the filter layer, for supporting the filter layer and preventing the through holes from being blocked, Wherein, the filter layer has multiple layers, The multiple filter layers have the same shape of filter holes, and the positions of the filter holes in two adjacent layers of the filter layers are staggered, Alternatively, the multi-layer filter layer is composed of a plurality of filter layers with different filter hole shapes, and the plurality of filter layers with different filter hole shapes are arranged crosswise, The filter layer is made of low adsorption stainless steel or organic polymer material. 5. A groundwater monitoring well device, used to be arranged in a groundwater sampling well, after filtering the groundwater of a specific formation, obtain the groundwater of the specific formation that needs to be detected, it is characterized in that, comprising: A plurality of cylindrical well pipes and water filter pipes connected in sequence from top to bottom, Wherein, the water filter pipe is arranged at the bottom of the groundwater sampling well, and the bottom of the well is located in the specific formation, The water filter pipe is the water filter pipe described in any one of claims 1-4. 6. A groundwater monitoring well device, used to be arranged in a groundwater sampling well, after filtering the groundwater of a specific formation, obtain the groundwater of the specific formation that needs to be detected, it is characterized in that, comprising: A plurality of cylindrical well pipes and water filter pipes, anti-blocking layers and water-stop rings connected in sequence from top to bottom, Wherein, the water filter pipe is arranged at the bottom of the groundwater sampling well, and the bottom of the well is located in the specific formation, and the water filter pipe has: The cylindrical pipe body has a pipe wall, and a plurality of through holes are arranged on the pipe wall, at least one filter layer wrapped on the pipe wall, The size of the filter holes in the filter layer is smaller than the size of the through holes, An anti-blocking layer with a mesh structure is arranged around the pipe wall and is located between the pipe wall and the filter layer for supporting the filter layer and preventing the through holes from being blocked, The water stop ring is arranged around the lower end of the outer surface of the well pipe located at the upper part of the water filter pipe, The water stop ring is made of water-swellable material. 7. The groundwater monitoring well device according to claim 6, characterized in that: Wherein, the centerline of the through hole is perpendicular to the centerline of the pipe body, Alternatively, the angle between the centerline of the through hole and the centerline of the pipe body in the downward direction is an acute angle, Alternatively, the angle between the centerline of the through hole and the upward direction of the centerline of the pipe body is an acute angle. 8. The groundwater monitoring well device according to claim 6, characterized in that: Wherein, the pipe wall includes an upper wall part, a middle wall part and a lower wall part from top to bottom, The plurality of through holes include an upper through hole provided on the upper wall part, a middle through hole provided on the middle wall part and a lower through hole provided on the lower wall part, The angle between the centerline of the upper through hole and the downward direction of the centerline of the pipe body is an acute angle, The centerline of the through hole is perpendicular to the centerline of the pipe body, The angle between the centerline of the lower through hole and the upward direction of the centerline of the pipe body is an acute angle. 9. The groundwater monitoring well device according to claim 6, characterized in that: Wherein, the filter layer has multiple layers, The multiple filter layers have the same shape of filter holes, and the positions of the filter holes in two adjacent layers of the filter layers are staggered, Alternatively, the multi-layer filter layer is composed of a plurality of filter layers with different filter hole shapes, and the plurality of filter layers with different filter hole shapes are arranged crosswise, The filter layer is made of low adsorption stainless steel or organic polymer material. 10. A modular groundwater monitoring well construction method is characterized in that, comprising the following steps: Select the location of the groundwater monitoring well, select a suitable drilling method according to the geological structure of the soil layer, and start the drilling operation of the sampling well. The aperture of the sampling well is greater than the sum of the outer diameter of the well pipe and the thickness of the water stop ring; When drilling to 1-3m below the target layer, the drilling operation of the sampling hole is completed; Connecting a plurality of well pipes and filter pipes in sequence, and attaching the water stop ring to the outer wall of the well pipes to form a groundwater monitoring well device; placing the groundwater monitoring well device in the sampling well; The wellhead protection cover is installed to complete the rapid construction of the groundwater monitoring well device.