A method for constructing a groundwater environment monitoring well in different aquifers

Abstract

The present invention relates to the technical field of construction of groundwater environment monitoring wells, and discloses a method for constructing a groundwater environment monitoring well in different aquifers, including: determining the target aquifer to be monitored, drilling a hole according to the selected location of the monitoring well; lowering a well pipe into the hole, limiting the axis of the well pipe through a support limiting member, and arranging the filter pipe section of the well pipe corresponding to the target aquifer; between the hole and the well pipe, a sealing and water-stopping layer is formed at the corresponding positions of the vadose zone and the relatively impermeable layer, a clay layer and a fine quartz sand layer are sequentially formed on the side of the sealing and water-stopping layer close to the target aquifer, and a filter layer is formed at the corresponding position of the target aquifer. By arranging a support limiting member on the outer side of the well pipe, the well pipe can be supported to prevent the well pipe from contacting the inner wall of the hole; by forming a water seepage layer through the clay layer, the fine quartz sand layer and the filter layer, the disturbance of the monitoring well to the target aquifer is reduced; through the sealing and water-stopping layer, the infiltration of groundwater in non-target aquifers is isolated.

Description

Technical Field

[0001] The present invention relates to the technical field of construction of groundwater environment monitoring wells. More specifically, the present invention relates to a method for constructing groundwater environment monitoring wells in different aquifers. Background Art

[0002] Groundwater dynamic monitoring is a basic means to master various information such as groundwater pollution, distribution of groundwater resources, and geological stratification. By constructing groundwater monitoring wells at different depths and obtaining groundwater pollution information of different strata, it can effectively promote the development of key tasks such as tracing the source of groundwater pollution, determining the pollution range, and predicting the remediation effect, and assist in environmental remediation projects.

[0003] Due to the unreasonable well construction method, most of the groundwater samples taken from groundwater monitoring wells are mixed samples of different aquifers, rather than samples of individual aquifers, and cannot reflect the true groundwater pollution situation of each aquifer.

[0004] Therefore, it is necessary to propose a method for constructing groundwater environment monitoring wells in different aquifers to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Implementation section. The Summary of the Invention section of the present invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a method for constructing groundwater environment monitoring wells in different aquifers, including:

[0007] Determine the target aquifer to be monitored, and drill a hole according to the selected location of the monitoring well; wherein, the vadose zone or relatively impermeable layer is above the target aquifer, and the relatively impermeable layer is below it;

[0008] Lower a well pipe into the hole, limit the axis of the well pipe through a support limiting member, and arrange the filter pipe section of the well pipe corresponding to the target aquifer;

[0009] Between the hole and the well pipe, a sealing and water-stop layer is formed at the corresponding positions of the vadose zone and the relatively impermeable layer. A clay layer and a fine quartz sand layer are sequentially formed on the side of the sealing and water-stop layer close to the target aquifer, and a filter material layer is formed at the corresponding position of the target aquifer.

[0010] Preferably, the sum of the thickness of the formed filter material layer, the thicknesses of the two clay layers above and below the filter material layer, and the thicknesses of the two fine quartz sand layers is less than or equal to the thickness of the target aquifer.

[0011] Preferably, the well pipe includes: a water collecting pipe section, a filter pipe section, and a sand settling pipe section that are connected in sequence;

[0012] The length of the filter pipe section is greater than or equal to 75% of the thickness of the target aquifer, and the top and bottom ends of the filter pipe section do not exceed the target aquifer. The filter pipe section is surrounded by a filter material layer.

[0013] Preferably, before lowering the well pipe into the hole, a sealing and water-stopping layer is formed at the corresponding position of the relatively water-resistant layer below the target aquifer, and the top surface of the sealing and water-stopping layer is used to support the bottom of the well pipe;

[0014] After lowering the well pipe into the hole, a clay layer, a fine quartz sand layer, a filter material layer, a fine quartz sand layer, a clay layer, and a sealing and water-stopping layer are sequentially formed on the top of the formed sealing and water-stopping layer.

[0015] Preferably, the installation position of the support and limit member on the well pipe is determined according to the position of the relatively water-resistant layer above the target aquifer. When lowering the well pipe into the hole, the outer side of the support and limit member is abutted against the side wall of the relatively water-resistant layer in the hole.

[0016] Preferably, before lowering the well pipe into the hole, a vibration generating member is installed on the support and limit member. The vibration generating member is connected to a control part outside the hole through a connecting wire, and the guide rod of the support and limit member extends downward.

[0017] Preferably, after lowering the well pipe into the hole, when forming the filter material layer, the control part controls the vibration generating member to generate vibration, and the vibration is transmitted through the guide rod to uniformly fill the filter material;

[0018] After the filter material is filled, the vibration generating member is disconnected from the support and limit member, and the vibration generating member is removed.

[0019] Preferably, at least four support and limit members are arranged circumferentially on the well pipe. The top of the support and limit member is provided with an installation area for detachably connecting with the vibration generating member; two symmetrically arranged vibration generating members have opposite vibration directions during operation.

[0020] Preferably, a pressure sensor is provided on the vibration generating member, and whether the axis position of the well pipe meets the requirements is determined through the pressure information fed back by the pressure sensor.

[0021] Preferably, the support and limit member includes: an elastic main body, on one side of which close to the well pipe, there is a first support plate. On one side of the first support plate, there are two elastic plates. The elastic plates are provided with second support plates extending outward. The second support plates are in limit connection with the installation blocks on the well pipe. A guide rod is detachably connected to the elastic main body; an elastic support located between the two elastic plates, one end of which abuts against the first support plate, and the other end abuts against the installation blocks on the well pipe in a limit manner, stretching the elastic plates;

[0022] The installation area is formed on the elastic support. When the vibration generating member works, it can make the elastic support, the elastic plate and the elastic main body expand and contract in the radial direction of the well pipe, and the elastic support and the first support plate can always be in contact.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] In the method for constructing a groundwater environment monitoring well with different aquifers of the present invention, by arranging a support and limiting member on the outer side of the well pipe, when lowering the well pipe, the support and limiting member can support the side of the well pipe to prevent the well pipe from contacting the inner wall of the hole, and ensure that the sealing and water-stop layer, the clay layer, the fine quartz sand layer and the filter layer are evenly filled between the hole and the well pipe;

[0025] By forming a water-permeable layer with the clay layer, the fine quartz sand layer and the filter layer, it helps to improve the structural stability of the constructed groundwater monitoring well, reduces the disturbance of the constructed groundwater monitoring well to the target aquifer, and ensures the stability of the groundwater information of the obtained target aquifer; through the arranged sealing and water-stop layer, the infiltration of groundwater in the non-target aquifer is effectively isolated, the interference of non-target aquifer information is avoided, and the accuracy of the groundwater in the obtained target aquifer is guaranteed.

[0026] In the method for constructing a groundwater environment monitoring well with different aquifers of the present invention, other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0028] Figure 1 It is a schematic structural diagram of a monitoring well with the target aquifer being the first aquifer in the method for constructing a groundwater environment monitoring well with different aquifers of the present invention;

[0029] Figure 2 It is a schematic structural diagram of a monitoring well with the target aquifer being the second aquifer in the method for constructing a groundwater environment monitoring well with different aquifers of the present invention;

[0030] Figure 3 It is a schematic structural diagram of a monitoring well with the target aquifer being the nth aquifer in the method for constructing a groundwater environment monitoring well with different aquifers of the present invention;

[0031] Figure 4Schematic structural diagram of the support and limit member and the vibration generating member used in the borehole in the construction method of the groundwater environment monitoring well for different aquifers according to the present invention;

[0032] Figure 5 Schematic connection structure diagram of the support and limit member and the vibration generating member in the construction method of the groundwater environment monitoring well for different aquifers according to the present invention;

[0033] Figure 6 Schematic three - dimensional structure diagram of the installation of the support and limit member and the well pipe in the construction method of the groundwater environment monitoring well for different aquifers according to the present invention;

[0034] Figure 7 Partial top - view structure diagram of the installation of the support and limit member and the well pipe in the construction method of the groundwater environment monitoring well for different aquifers according to the present invention;

[0035] Figure 8 Exploded structure diagram of the support and limit member in the construction method of the groundwater environment monitoring well for different aquifers according to the present invention;

[0036] Figure 9 Cross - sectional structure diagram of the support and limit member in the construction method of the groundwater environment monitoring well for different aquifers according to the present invention;

[0037] Figure 10 Internal structure diagram of the vibration generating member in the construction method of the groundwater environment monitoring well for different aquifers according to the present invention. Detailed implementation mode

[0038] The following further describes the present invention in detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it according to the description in the specification.

[0039] It should be understood that the terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0040] As Figures 1 - 3 shown, the present invention provides a construction method for a groundwater environment monitoring well for different aquifers, including:

[0041] Determine the target aquifer 1 to be monitored, and drill a hole according to the selected location of the monitoring well; wherein, above the target aquifer 1 is the vadose zone 2 or the relatively impermeable layer 3, and below is the relatively impermeable layer 3;

[0042] Lower the well pipe into the hole, limit the axis of the well pipe through the support and limit member 8, and arrange the filter pipe section 12 of the well pipe corresponding to the target aquifer 1;

[0043] Between the hole and the well pipe, an isolation and water-stop layer 4 is formed at the corresponding positions of the vadose zone 2 and the relatively impermeable layer 3. On the side of the isolation and water-stop layer 4 close to the target aquifer 1, a clay layer 5 and a fine quartz sand layer 7 are sequentially formed, and a filter layer 10 is formed at the corresponding position of the target aquifer 1.

[0044] Among them, the vadose zone 2 is a geological medium located below the earth's surface and above the water table; the relatively impermeable layer 3 refers to a layer with relatively poor water permeability compared with other rock layers during the groundwater flow process.

[0045] The material of the isolation and water-stop layer 4 can be impermeable materials such as bentonite and cement without secondary pollution and with strong stability. Preferably, it is a cement material, which can effectively isolate the vadose zone 2 or the relatively impermeable layer 3 and prevent the groundwater from non-target aquifers 1 from mixing in.

[0046] The filling material of the fine quartz sand layer 7 is fine quartz sand, and its thickness is preferably set to 250 mm. The thickness of the clay layer 5 is greater than that of the fine quartz sand layer 7.

[0047] The filter used in the filter layer 10 is composed of spherical particles that have been cleaned with clean water or steam, screened in proportion, have stable chemical properties, known composition, and uniform size. It does not react with substances in the environment and does not produce secondary pollution.

[0048] As Figure 1 shown, the target aquifer 1 is the first aquifer, with the vadose zone 2 above it and the relatively impermeable layer 3 below it; as Figure 2 and Figure 3 shown, the target aquifer 1 is the second aquifer or the nth aquifer, where n is greater than or equal to 3, and the relatively impermeable layer 3 is above and below it.

[0049] After drilling and forming the hole, the hole is cleaned by the mud replacement method, and then the well pipe is lowered into the hole. A support and limit member 8 is arranged on the outside of the well pipe. Thus, when lowering the well pipe, the support and limit member 8 can support the side of the well pipe, prevent the well pipe from contacting the inner wall of the hole, and ensure the uniform filling of the isolation and water-stop layer 4, the clay layer 5, the fine quartz sand layer 7, and the filter layer 10 between the hole and the well pipe.

[0050] The clay layer 5, the fine quartz sand layer 7, and the filter layer 10 form a water-permeable layer, which helps to improve the structural stability of the constructed groundwater monitoring well, reduces the disturbance of the constructed groundwater monitoring well to the target aquifer 1, and ensures the stability of the groundwater information obtained from the target aquifer; through the arranged isolation and water-stop layer 4, the infiltration of groundwater from non-target aquifers is effectively isolated, the interference of non-target aquifer information is avoided, and the accuracy of the groundwater obtained from the target aquifer 1 is guaranteed.

[0051] In one embodiment, the sum of the thickness of the formed filter media layer 10, the thicknesses of the two clay layers 5 above and below the filter media layer 10, and the thicknesses of the two fine quartz sand layers 7 is less than or equal to the thickness of the target aquifer 1.

[0052] The filter media layer 10, the clay layers 5, and the fine quartz sand layers 7 are used to allow the groundwater in the target aquifer 1 to permeate. Preferably, the sum of the thickness of the filter media layer 10, the thicknesses of the two clay layers 5, and the thicknesses of the two fine quartz sand layers 7 is less than the thickness of the target aquifer 1, so that the part of the sealing and water-stopping layer 4 in contact with the clay layer 5 can cover the upper and lower ends of the target aquifer 1, further preventing the infiltration of groundwater from non-target aquifers.

[0053] In one embodiment, the well pipe includes: a water collecting pipe section 11, a filter pipe section 12, and a sand settling pipe section 13 connected in sequence;

[0054] The length of the filter pipe section 12 is greater than or equal to 75% of the thickness of the target aquifer 1, and the top and bottom ends of the filter pipe section 12 do not exceed the target aquifer 1, and the filter pipe section 12 is surrounded by the filter media layer 10.

[0055] The water collecting pipe section 11, the filter pipe section 12, and the sand settling pipe section 13 can all be made of PVC plastic pipes, and adjacent pipe sections are connected by threads, and a sealing ring or Teflon tape is added at the thread connection for sealing; the filter pipe section 12 is located in the middle of the target aquifer 1 and is surrounded by the filter media layer 10. The groundwater in the target aquifer 1 will infiltrate into the filter pipe section 12 through the filter media layer 10 and be collected in the water collecting pipe section 11.

[0056] In one embodiment, before lowering the well pipe into the hole, a sealing and water-stopping layer 4 is formed at the corresponding position of the relatively water-resistant layer 3 below the target aquifer 1, and the top surface of the sealing and water-stopping layer 4 is used to support the bottom of the well pipe;

[0057] After lowering the well pipe into the hole, a clay layer 5, a fine quartz sand layer 7, a filter media layer 10, a fine quartz sand layer 7, a clay layer 5, and a sealing and water-stopping layer 4 are formed in sequence on the top of the formed sealing and water-stopping layer 4.

[0058] The sealing and water-stopping layer 4 is first formed below the target aquifer 1, and the top surface of the sealing and water-stopping layer 4 can support the bottom of the well pipe. After the well pipe is lowered, the bottom of the well pipe can contact the top surface of the sealing and water-stopping layer 4, so as to ensure that the filter pipe section 12 is at the corresponding position of the target aquifer 1; after the well pipe is lowered, the well pipe is kept at the center of the hole by a support and limiting member, and then a clay layer 5, a fine quartz sand layer 7, a filter media layer 10, a fine quartz sand layer 7, a clay layer 5, and a sealing and water-stopping layer 4 are formed in sequence on the top of the sealing and water-stopping layer 4.

[0059] In one embodiment, the installation position of the support and limit member 8 on the well pipe is determined according to the position of the relatively water-resistant layer 3 above the target aquifer 1. When lowering the well pipe into the hole, the outer side of the support and limit member 8 is abutted against the side wall of the relatively water-resistant layer 3 in the hole.

[0060] Since the relatively water-resistant layer 3 is a layer with poor water permeability, the support and limit member 8 can form a good supporting effect with the relatively water-resistant layer 3; and the sealing and water-stop layer 4 is also formed correspondingly here. The formed sealing and water-stop layer 4 can be combined with the support and limit member 8 to ensure the structural strength of the sealing and water-stop layer 4, further prevent the groundwater from non-target aquifers from mixing into the target aquifer 1, and ensure the accuracy of obtaining groundwater information in the target aquifer.

[0061] As Figure 4 shown, in one embodiment, before lowering the well pipe into the hole, a vibration generating member 9 is installed on the support and limit member 8. The vibration generating member 9 is connected to the control part outside the hole through a connecting wire 14, and the guide rod 85 of the support and limit member 8 extends downward.

[0062] Wherein, the guide rod 85 extends downward close to the bottom of the area to be filled with filter material; the guide rod 85 is an environmentally friendly material with good vibration transmission effect and no pollution; in addition, a plurality of transverse support rods can be formed on the side surface of the guide rod 85 to promote the uniform filling of the filter material.

[0063] Furthermore, as Figure 4 shown, after lowering the well pipe into the hole and forming the filter material layer 10, the control part is used to control the vibration generating member 9 to generate vibration, and the vibration is transmitted through the guide rod 85 to make the filter material fill evenly;

[0064] After the filter material is filled, the vibration generating member 9 is disconnected from the support and limit member 8, and the vibration generating member 9 is taken out.

[0065] The vibration generating member 9 can be detachably connected to the support and limit member 8, and the connection and disconnection between the two can be controlled by the control part; the vibration generating member 9 does not come into contact with the filter material layer 10, and other components of the support and limit member 8 except the guide rod 85 also do not come into contact with the filter material layer 10;

[0066] When filling the filter material, the guide rod 85 of the support and limit member 8 can be vibrated through the vibration generating member 9. The guide rod 85 is located in the middle of the filter material, so that the filter material is filled more evenly under the vibration, preventing voids from appearing inside the filter material layer 10, ensuring the stability of the formation position and thickness of the quartz fine sand layer 7, clay layer 5 and sealing and water-stop layer 4 above it subsequently, and preventing the phenomenon of sinking due to the voids in the filter material layer 10, thereby reducing the water isolation effect on non-target aquifers, and further reducing the probability of groundwater from non-target aquifers mixing into the target aquifer 1;

[0067] After the filter media filling is completed, the control unit is used to disconnect the vibration generating member 9 from the support and limit member 8, then the connection line 14 is lifted upward, and the vibration generating member 9 can be taken out and recycled.

[0068] As Figure 6 shown, in one embodiment, at least four support and limit members 8 are arranged in the circumferential direction of the well pipe, and an installation area for detachably connecting with the vibration generating member 9 is provided at the top of the support and limit member 8; two symmetrically arranged vibration generating members 9 have opposite vibration directions during operation.

[0069] In order to reduce the influence of vibration on the offset of the well pipe position in the hole, the vibration generating members 9 are arranged in an even number and are symmetrically arranged in pairs, and the vibration directions of the two symmetrically arranged vibration generating members 9 are opposite, so that it can be ensured that when vibrating, the forces on the well pipe in the symmetric directions (such as the left and right directions) are balanced, preventing the position of the well pipe from changing.

[0070] As Figure 10 shown, in one embodiment, a pressure sensor 93 is provided on the vibration generating member 9, and whether the axis position of the well pipe meets the requirements is determined through the pressure information fed back by the pressure sensor 93.

[0071] The pressure sensor 93 is provided at one or both ends of the vibration generating member 9 in the radial direction of the well pipe. When the well pipe is lowered into the hole, the information fed back by the pressure sensor 93 can be used to know whether the axis position of the well pipe corresponds to the axis of the hole, and it can be judged by comparing the pressure values detected by the pressure sensors 93 in four directions; for example, if the difference between the two pressure values detected by the pressure sensors 93 in the left and right directions exceeds the threshold, it indicates that the well pipe is offset in the left and right directions and the position of the well pipe needs to be adjusted.

[0072] As Figures 5 - 9 shown, in one embodiment, the support and limit member 8 includes: an elastic main body 81, on one side close to the well pipe, a first support plate 82 is provided, on one side of the first support plate 82, two elastic plates 83 are provided, on the elastic plate 83, a second support plate 84 extending outward is provided, the second support plate 84 is in limit connection with the installation block 15 on the well pipe, and a guide rod 85 is detachably connected to the elastic main body 81; an elastic support 86 located between the two elastic plates 83, one end of which abuts against the first support plate 82 and the other end abuts against the installation block 15 on the well pipe in a limit manner, stretching the elastic plate 83;

[0073] The installation area is formed on the elastic support 86. When the vibration generating member 9 works, the elastic support 86, the elastic plate 83 and the elastic main body 81 can expand and contract in the radial direction of the well pipe, and the elastic support 86 and the first support plate 82 can always be in contact.

[0074] Furthermore, asFigure 8 As shown, the cross-section of the elastic main body 81 is hexagonal, and a through hole 811 is provided at the bottom thereof. A threaded hole is provided at the top of the guide rod 85, and the guide rod 85 is installed on the elastic main body 81 by screws; the screws pass through the through hole 811 and are connected to the threaded hole of the guide rod 85 to fix the guide rod 85.

[0075] The elastic plate 83 is made of elastic rubber material.

[0076] As Figure 8 and Figure 9 As shown, the elastic support 86 includes two abutting plates 861. The bottoms of the two abutting plates 861 are connected by an elastic connecting plate 862, and the elastic connecting plate 862 is inclined or arc-shaped; a T-shaped limiting block 863 is provided on the outside of one of the abutting plates 861, and a limiting protrusion 864 is provided on the outside of the T-shaped limiting block 863. The limiting protrusion 864 is made of rubber material and has elasticity, and the limiting protrusion 864 can limit the installation position of the elastic support 86.

[0077] The mounting block 15 is provided with limiting grooves 151 corresponding to the two second support plates 84. A T-shaped groove 152 corresponding to the T-shaped limiting block 863 is provided on the side of the limiting groove 151 away from the elastic main body 81, and a groove 153 corresponding to the limiting protrusion 864 is provided on the side of the T-shaped groove 152 away from the elastic main body 81.

[0078] The mounting block 15 is clamped, threadedly connected to the well pipe, or a plurality of mounting blocks 15 are installed on a clamp, and the clamp is connected to the well pipe.

[0079] The elastic main body 81 of the support limiting member 8 is detachably connected to the elastic support 86, the elastic support 86 is detachably connected to the mounting block 15, and the elastic main body 81 is detachably connected to the mounting block 15; when installing the support limiting member 8, insert the second support plate 84 into the limiting groove 151, insert the T-shaped limiting block 863 into the T-shaped groove 152. When inserted in place, the limiting protrusion 864 is inserted into the groove 153 to limit the position of the T-shaped limiting block 863. Then, the two abutting plates 861 of the elastic support 86 respectively abut against the first support plate 82 and the mounting block 15, exerting a tensile force on the elastic plate 83. Under the elastic restoring force of the elastic plate 83 and the elastic supporting force of the elastic support 86 on the two abutting plates 861, the elastic support 86 always abuts between the first support plate 82 and the mounting block 15.

[0080] The support limiting member 8 can replace the elastic main body 81 with different sizes according to different hole diameters or different well pipe diameters. Connecting the elastic main body 81 to the mounting block 15 through the elastic support 86 can realize the installation of the support limiting member 8, which is convenient to use.

[0081] When the vibration generating member 9 generates vibration, it can drive the elastic support 86, the elastic plate 83 and the elastic main body 81 to expand and contract in the radial direction of the well pipe, so that the guide rod 85 vibrates in the radial direction. Since the upper and lower ends of the elastic main body 81 in the vertical direction also move up and down when it expands and contracts in the radial direction, that is, as Figure 5 shown in the upper and lower ends of the elastic main body 81, the guide rod 85 installed at the bottom end of the elastic main body 81 will also vibrate vertically. Thus, the guide rod 85 can form radial and vertical vibration effects on the filled filter material to promote uniform filling of the filter material and prevent the generation of voids; after the filter material layer 10 is formed, the guide rod 85 is buried in the filter material layer 10 and can play a role in stabilizing the structure of the filter material layer 10.

[0082] Furthermore, as Figure 10 shown, the vibration generating member 9 includes: a housing 91, inside which there is a vibration main body. One end of the vibration main body extending out of the housing 91 is connected to a movable block 92. Pressure sensors 93 and third electromagnets 94 are provided on one side of the movable block 92 and the two abutting plates 861 of the housing 91 close to the elastic support 86;

[0083] Both of the two abutting plates 861 can be adsorbed by the third electromagnet 94.

[0084] When installing the vibration generating member 9, place it between the two abutting plates 861, and then make the third electromagnet 94 generate magnetism through the control unit, so as to adsorb with the two abutting plates 861 to realize the installation of the vibration generating member 9;

[0085] The pressure sensor 93 is in contact with the abutting plate 861. When the vibration main body is not working, the inner side of the movable block 92 is in contact with the end face of the housing 91. If the axis of the well pipe is offset, it will squeeze the pressure sensor 93 in a certain direction, and the detected pressure value will become larger, and the position of the well pipe needs to be adjusted;

[0086] When the vibration main body works, it will drive the movable block 92 to generate reciprocating motion in the radial direction of the well pipe, that is, the movable block 92 makes reciprocating push and pull on one side of the abutting plate 861 ( Figure 10 the left side in Figure 10 ). Since the abutting plate 861 is always in contact with the first support plate 82 under the elastic action of the elastic plate 83 and the elastic connecting plate 862, the first support plate 82 will move synchronously with the abutting plate 861 ( Figure 10 the left side in Figure 10 that is in contact with it. Thus, the elastic main body 81 expands and contracts in the radial direction, and its upper and lower ends move up and down in the vertical direction, and further the guide rod 85 generates vibration.

[0087] Furthermore, as Figure 10As shown in the figure, the vibration main body includes: a rod 95 slidably arranged in a housing 91, with a permanent magnet 96 provided on the outer side of the middle of the rod 95. A first electromagnet 97 and a second electromagnet 98 are respectively provided on both sides of the permanent magnet 96 inside the housing 91; the first electromagnet 97, the second electromagnet 98, the third electromagnet 94 and the pressure sensor 93 are all connected to a control part outside the hole through wires. The wires are inside a connecting wire 14, and the connecting wire 14 is connected to the housing 91.

[0088] Assume that the left side of the permanent magnet 96 in Figure 10 is the N pole and the right side is the S pole. Then when the side of the first electromagnet 97 on the left close to the permanent magnet 96 is the S pole and the side of the second electromagnet 98 on the right close to the permanent magnet 96 is the S pole, a force is generated on the permanent magnet 96 to make it move to the left, thereby driving the rod 95 and the movable block 92 to move to the left synchronously; when the side of the first electromagnet 97 on the left close to the permanent magnet 96 is the N pole and the side of the second electromagnet 98 on the right close to the permanent magnet 96 is the N pole, a force is generated on the permanent magnet 96 to make it move to the right, thereby driving the rod 95 and the movable block 92 to move to the right synchronously;

[0089] By changing the magnetic poles of the first electromagnet 97 and the second electromagnet 98, an effect is exerted on the permanent magnet 96, thereby realizing the reciprocating movement of the rod 95 and generating a vibration effect.

[0090] When the vibration main body needs to be disassembled, the first electromagnet 97, the second electromagnet 98 and the third electromagnet 94 are all powered off through the control part. Then the third electromagnet 94 loses the adsorption effect on the abutting plate 861. Then, by lifting the connecting wire 14 upward with force, the entire vibration generating part 9 can be taken out between the two abutting plates 861, which is convenient for next use.

[0091] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0092] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to specific details and the examples shown and described herein.

Claims

1. A method for constructing a groundwater environmental monitoring well in different aquifers, characterized in that, Including: Determine the target aquifer (1) to be monitored, and drill a hole according to the selected monitoring well location; wherein, above the target aquifer (1) is the vadose zone (2) or relatively impermeable layer (3), and below is the relatively impermeable layer (3); Lower a well pipe into the hole, limit the axis of the well pipe through the support and limit member (8), and arrange the filter pipe section (12) of the well pipe corresponding to the target aquifer (1); Between the hole and the well pipe, a sealing and water-stop layer (4) is formed at the corresponding positions of the vadose zone (2) and the relatively impermeable layer (3). A clay layer (5) and a fine quartz sand layer (7) are sequentially formed on the side of the sealing and water-stop layer (4) close to the target aquifer (1), and a filter layer (10) is formed at the corresponding position of the target aquifer (1); Wherein, before lowering the well pipe into the hole, a vibration generating member (9) is installed on the support and limit member (8). The vibration generating member (9) is connected to the control part outside the hole through a connecting wire (14), and the guide rod (85) of the support and limit member (8) extends downward; After lowering the well pipe into the hole, when forming the filter layer (10), control the vibration generating member (9) to generate vibration through the control part, and transmit the vibration through the guide rod (85) to evenly fill the filter material; After the filter material is filled, disconnect the vibration generating member (9) from the support and limit member (8), and take out the vibration generating member (9); The well pipe includes: a water collecting pipe section (11), a filter pipe section (12) and a sand settling pipe section (13) connected in sequence; The length of the filter pipe section (12) is greater than or equal to 75% of the thickness of the target aquifer (1), and the top and bottom ends of the filter pipe section (12) do not exceed the target aquifer (1), and the filter pipe section (12) is surrounded by the filter layer (10); At least four support and limit members (8) are arranged in the circumferential direction of the well pipe. The top of the support and limit member (8) is provided with an installation area for detachably connecting with the vibration generating member (9); two symmetrically arranged vibration generating members (9) have opposite vibration directions during operation; The support and limit member (8) includes: an elastic main body (81), on the side close to the well pipe, there is a first support plate (82). On one side of the first support plate (82), there are two elastic plates (83). The elastic plates (83) are provided with second support plates (84) extending outward. The second support plates (84) are in limit connection with the installation blocks (15) on the well pipe, and a guide rod (85) is detachably connected to the elastic main body (81); an elastic support (86) located between the two elastic plates (83), one end of which abuts against the first support plate (82), and the other end abuts against the installation block (15) on the well pipe in a limit manner, stretching the elastic plates (83); The installation area is formed on the elastic support (86). When the vibration generating member (9) works, it can make the elastic support (86), the elastic plates (83) and the elastic main body (81) expand and contract in the radial direction of the well pipe, and the elastic support (86) and the first support plate (82) can always be in contact.

2. The well construction method for groundwater environment monitoring wells in different aquifers according to claim 1, characterized in that, The sum of the thickness of the formed filter media layer (10), the thicknesses of the two clay layers (5) above and below the filter media layer (10), and the thicknesses of the two fine quartz sand layers (7) is less than or equal to the thickness of the target aquifer (1).

3. The well construction method for groundwater environment monitoring wells in different aquifers according to claim 1, characterized in that, Before lowering the well pipe into the hole, a sealing and water-stopping layer (4) is formed at the corresponding position of the relatively impermeable layer (3) below the target aquifer (1), and the top surface of the sealing and water-stopping layer (4) is used to support the bottom of the well pipe; After lowering the well pipe into the hole, a clay layer (5), a fine quartz sand layer (7), a filter media layer (10), a fine quartz sand layer (7), a clay layer (5), and a sealing and water-stopping layer (4) are sequentially formed on the top of the formed sealing and water-stopping layer (4).

4. The well construction method for groundwater environment monitoring wells in different aquifers according to claim 1, characterized in that, The installation position of the support and limit member (8) on the well pipe is determined according to the position of the relatively impermeable layer (3) above the target aquifer (1). When lowering the well pipe into the hole, the outer side of the support and limit member (8) is brought into contact with the side wall of the relatively impermeable layer (3) in the hole.

5. The method for constructing a groundwater environmental monitoring well in different aquifers according to claim 4, characterized in that, A pressure sensor (93) is provided on the vibration generating member (9), and whether the axis position of the well pipe meets the requirements is determined by the pressure information fed back by the pressure sensor (93).

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