River and lake monitoring well construction process

Abstract

The application discloses a river and lake monitoring well construction process, adopts well drilling equipment to vertically drill downwards on the ground, stops drilling to form a base well after drilling into a silty stratum; fixes a base plate at the bottom of the base well, vertically sets a barrel mouth upwards on the side of the base plate away from the bottom of the base well, and enables a sliding barrel to extend into the filter pipe; vertically places the filter pipe into the base well, and enables one end of the filter pipe close to the bottom of the base well to be inserted into the sliding barrel; fills a filter layer between the side of the filter pipe close to the wall of the base well and the wall; makes a cleaning structure for cleaning the pipe cutting seam of the filter pipe at the end of the filter pipe away from the bottom of the base well; and performs sealing treatment on the end of the filter pipe away from the bottom of the base well. The application avoids and solves the problem that the filter pipe cannot take water after the pipe cutting seam of the filter pipe is blocked by silt, and maintains the detection of underground water quality by the monitoring well.

Description

Technical Field

[0001] This invention relates to the field of monitoring well construction technology, specifically to a construction process for monitoring wells in rivers and lakes. Background Technology

[0002] As a crucial component of the water resource system, the groundwater system is an indispensable regulator for maintaining the Earth's shallow surface water balance and preserving biodiversity. Groundwater not only plays a vital role in the sustainable economic development of arid regions but is also one of the most significant factors influencing their ecological environment. The most direct manifestation of changes in the groundwater flow system is the dynamic fluctuation of the groundwater level, and these changes, by altering the water cycle and water balance, affect the regional ecosystem.

[0003] Monitoring and understanding the dynamic changes of groundwater is an important foundation for scientifically evaluating groundwater resources, formulating rational development and utilization and effective protection measures, and mitigating and preventing groundwater pollution and related geological disasters.

[0004] Based on lithology, occurrence conditions, physical properties, and hydraulic characteristics, the groundwater type at the location of the monitoring well is pore water in a loose sedimentary layer. Atmospheric precipitation is the main source of groundwater recharge. Surface water and groundwater alternate, with surface water recharged for groundwater during periods of abundant water and groundwater recharged for surface water during periods of low water, exhibiting obvious seasonal variations. As the water level rises and falls, it causes sediment movement in the water, which can block the filtration structure of the monitoring well, resulting in the monitoring well being unable to draw water. Summary of the Invention

[0005] The main objective of this invention is to provide a construction process for river and lake monitoring wells, which aims to solve the technical problem in the prior art where the filter structure of monitoring wells is easily blocked by silt, resulting in the monitoring wells being unable to draw water.

[0006] To achieve the above objectives, the present invention proposes a construction process for river and lake monitoring wells, comprising the following steps:

[0007] Drilling equipment is used to drill vertically downwards into the ground. After reaching the silty sand stratum, drilling is stopped to form a foundation well.

[0008] The base plate is fixed to the bottom of the base well, and a sliding cylinder with the opening facing upwards is vertically installed on the side of the base plate away from the bottom of the base well, which allows the filter pipe to be inserted.

[0009] The filter tube is placed vertically into the base well, with one end of the filter tube closest to the bottom of the base well inserted into the slide tube;

[0010] A filter layer is filled between the filter pipe and the well wall on the side closest to the base well.

[0011] A cleaning structure is constructed at the end of the filter pipe away from the bottom of the base well for cleaning the pipe cuts.

[0012] Seal the end of the filter pipe that faces away from the bottom of the base well.

[0013] Preferably, the method involves using drilling equipment to drill a hole vertically downwards into the ground. After reaching a silty sandy stratum, drilling is stopped to form a foundation well. The specific process includes the following steps:

[0014] Transport the drilling rig to the location where drilling is to be carried out;

[0015] Replace the drill bit of the drilling rig with a spiral drill bit;

[0016] The drilling rig drives the auger bit vertically downwards toward the ground, using a rotary drilling method to drill;

[0017] The auger bit stops drilling downwards after it enters the silty sand layer.

[0018] The auger bit is removed from the borehole, and the mud and sand inside the borehole are cleaned out to obtain the base well.

[0019] Preferably, the step of vertically inserting the filter tube into the base well, with one end of the filter tube near the bottom of the base well inserted into the slide tube, specifically includes the following steps:

[0020] Place the sensor used to detect water quality into the filter tube;

[0021] Plug both ends of the filter tube with plugs;

[0022] The filter tube is lifted vertically using a lifting device;

[0023] When running the well casing, the filter pipe should be placed vertically in the center of the base well, and the upper end of the filter pipe should be kept horizontal.

[0024] One end of the filter tube near the bottom of the base well is inserted into the slide tube, with a clearance fit between the filter tube and the slide tube, and the end of the filter tube away from the slide tube is located above the base well.

[0025] After accurately measuring the installation depth of the filter tube, the filter tube is lowered.

[0026] Preferably, the step of filling the filter layer between the filter pipe and the well wall on the side of the filter pipe near the base well specifically includes the following steps:

[0027] Prefabricated first and second isolation pipes are used;

[0028] Multiple first water passage holes are opened on the wall of the first isolation pipe;

[0029] Multiple second water passages are opened on the wall of the second isolation pipe;

[0030] The first isolation pipe and the second isolation pipe are vertically placed into the foundation well using lifting equipment. The first isolation pipe is sleeved on the outer wall of the filter pipe, and the second isolation pipe is sleeved on the outer wall of the first isolation pipe.

[0031] The first gravel is filled between the second isolation pipe and the wellbore wall of the base well;

[0032] A second type of gravel is filled between the second isolation pipe and the first isolation pipe;

[0033] A third type of gravel is filled between the first isolation tube and the filter tube.

[0034] Preferably, the diameter of the third gravel is smaller than the diameter of the second gravel, and the diameter of the second gravel is smaller than the diameter of the first gravel.

[0035] Preferably, the first isolation pipe extends out of the wellhead near the base well, and the second isolation pipe is located inside the base well at the end near the wellhead; the step of creating a cleaning structure at the end of the filter pipe away from the bottom of the base well for cleaning the pipe cuts of the filter pipe specifically includes the following steps:

[0036] Within the area jointly defined by the side of the second isolation pipe away from the bottom of the base well and the side of the first isolation pipe near the well wall, rammed earth is filled using a ramming machine.

[0037] A casting mold is fitted onto the outer wall of the end of the first isolation pipe that extends out of the foundation well.

[0038] An isolation sleeve is fitted onto the outer wall of the end of the filter pipe that extends out of the base well.

[0039] Concrete is poured into the casting mold so that the concrete wraps around the outer wall of the first isolation pipe extending from the foundation well and the outer wall of the isolation cylinder.

[0040] After the concrete has hardened into a concrete block, the isolation cylinder is removed, so that a sliding hole is formed between the outer wall of the filter tube and the concrete block;

[0041] The inner wall of the sliding hole on the side away from the base well is symmetrically provided with sliding grooves on both sides;

[0042] A slider for sliding within the chute is connected to the side of the filter tube near the chute.

[0043] A spring is installed inside the chute, with one end of the spring connected to the side wall of the chute near the base well and the other end connected to the slider.

[0044] Preferably, the step of creating a cleaning structure at the end of the filter pipe away from the bottom of the base well for cleaning the pipe cuts further includes the following steps:

[0045] A sealing ring is fitted on the side of the filter tube that contacts the wall of the sliding hole;

[0046] The wall of the sliding hole is smoothed to ensure a tight fit between the hole wall and the sealing ring.

[0047] Preferably, the end of the filter tube facing away from the base well extends out of the sliding hole, and the sealing treatment at the end of the filter tube facing away from the bottom of the base well specifically includes the following steps:

[0048] A sealing pipe is embedded on the side of the concrete block away from the foundation well to accommodate one end of the filter pipe extending out of the sliding hole.

[0049] The gap between the sealing tube and the concrete block is filled with sealant;

[0050] A manhole cover is installed on the sealing pipe to seal the end of the pipe that faces away from the concrete block.

[0051] Preferably, the construction process for river and lake monitoring wells also includes the following steps:

[0052] A shelf is provided around the outer wall of the concrete block for contact with the ground.

[0053] In the technical solution of this invention, the filter pipe extends into the silty sand layer, which significantly increases the water content of the silty sand layer, solving the problem of the monitoring well not being able to draw water during the dry season. The filter layer can filter the groundwater before it enters the filter pipe, thereby reducing the chance of the pipe cut being blocked. After the pipe cut is blocked by mud and sand, the blockage is cleared by the cleaning structure, thus avoiding and solving the problem of the filter pipe not being able to draw water after the pipe cut is blocked by mud and sand, and maintaining the monitoring well's ability to detect groundwater quality. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0055] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0056] Figure 2 This is a schematic diagram of the base well structure of the present invention;

[0057] Figure 3 This is a schematic diagram of the cleaning structure of the present invention;

[0058] Figure 4 This is a schematic diagram of the first isolation tube and the second isolation tube of the present invention.

[0059] Explanation of icon numbers:

[0060] 1. Base well; 2. Filter pipe; 3. Plug; 4. Base plate; 5. Slide cylinder; 6. First isolation pipe; 6a. First water passage hole; 7. Second isolation pipe; 7a. Second water passage hole; 8. Third gravel; 9. Second gravel; 10. First gravel; 11. Rammed earth; 12. Concrete block; 13. Slide groove; 14. Sliding block; 15. Spring; 16. Sealing pipe; 17. Well cover; 18. Shelf.

[0061] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0063] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0064] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0067] This invention proposes a construction process for monitoring wells in rivers and lakes.

[0068] Please refer to Figures 1 to 4 The construction process for monitoring wells in this river and lake includes the following steps:

[0069] S10, using drilling equipment to drill vertically downwards into the ground, and stopping drilling after reaching the silty sandy stratum to form the foundation well 1;

[0070] S20, fix the base plate 4 to the bottom of the base well 1, and vertically install a sliding cylinder 5 with the cylinder opening facing upward on the side of the base plate 4 away from the bottom of the base well 1, which allows the filter pipe 2 to be inserted.

[0071] S30, vertically insert the filter tube 2 into the base well 1, and insert the end of the filter tube 2 near the bottom of the base well 1 into the slide tube 5;

[0072] S40, a filter layer is filled between the filter pipe 2 and the well wall on the side of the filter pipe 2 near the well wall of the base well 1;

[0073] S50, a cleaning structure is made at the end of the filter pipe 2 away from the bottom of the base well 1 for cleaning the pipe cut of the filter pipe 2;

[0074] S60, a sealing treatment is performed on the end of filter pipe 2 that is away from the bottom of base well 1.

[0075] In the technical solution of this invention, the filter pipe 2 extends into the silty sand layer, which significantly increases the water content of the silty sand layer, solving the problem of the monitoring well not being able to obtain water during the dry season. The filter layer can filter the groundwater before it enters the filter pipe 2, thereby reducing the probability of the pipe cut of the filter pipe 2 being blocked. After the pipe cut of the filter pipe 2 is blocked by mud and sand, the blockage is cleared by the cleaning structure, thereby avoiding and solving the problem that the filter pipe 2 cannot obtain water after the pipe cut is blocked by mud and sand, and maintaining the monitoring well's ability to detect groundwater quality.

[0076] Please refer to the appendix. Figure 1-2 The process involves drilling a hole vertically downwards into the ground using drilling equipment. After reaching a silty sandy stratum, drilling is stopped to form the foundation well 1. The specific process includes the following steps:

[0077] S11, transporting the drilling rig to the drilling location;

[0078] S12, replace the drill bit of the drilling rig with a spiral drill bit;

[0079] S13, the drilling rig drives the auger drill bit vertically downwards toward the ground and drills using the rotary drilling method;

[0080] S14, stop drilling downwards after the auger bit enters the silty sand layer;

[0081] S15, remove the auger bit from the borehole and clean the mud and sand inside the borehole to obtain the base well 1.

[0082] Specifically, the spiral blade drilling method is adopted, without the use of mud circulation technology, to avoid polluting the original state of groundwater and make the monitoring data more accurate. The drilled foundation well is at least 10 meters deep to reach the underground silty sand strata. To protect the water quality, no flushing fluid is used during drilling. The drilling rig is a fully hydraulic crawler-type water well drilling rig, which does not require tower dismantling. Under the condition of ensuring no safety hazards, only the tower cylinder needs to be retracted.

[0083] Please refer to the appendix. Figure 2 The step of vertically inserting the filter tube 2 into the base well 1, with one end of the filter tube 2 near the bottom of the base well 1 inserted into the slide tube 5, specifically includes the following steps:

[0084] S31, Place the sensor used to detect water quality into filter tube 2;

[0085] S32, the two ends of the filter tube 2 are blocked by the plug 3;

[0086] S33, the method of lifting and lowering the tube is adopted, and the filter tube 2 is vertically lifted by lifting equipment;

[0087] S34, When running the well casing, the filter pipe 2 is upright in the center of the base well 1, and the upper end of the filter pipe 2 is kept horizontal;

[0088] S35, insert the end of the filter pipe 2 near the bottom of the base well 1 into the slide cylinder 5, with a clearance fit between the filter pipe 2 and the slide cylinder 5, and the end of the filter pipe 2 away from the slide cylinder 5 located above the base well 1;

[0089] S36. After accurately measuring the installation depth of filter tube 2, the lowering of filter tube 2 is completed.

[0090] Specifically, the two ends of the filter pipe 2 are blocked by the plug 3 to prevent sediment from entering the filter pipe 2 through the two ends. The filter pipe 2 is made of PVC-U well pipe with an outer diameter of φ200mm and a wall thickness of 7mm. It uses threaded connection with good quality joints and does not use traditional glue bonding method, which can more effectively protect the original state of groundwater from damage. The filter pipe 2 adopts a transverse slit process with a slit width of 3mm and a slit length of 15cm. The compressive strength is 80KN / m² and the porosity is 15%. The outside of the pipe is wrapped with 60-mesh 304 stainless steel mesh with a thickness of more than 3mm to avoid friction damage between the filter pipe 2 and gravel.

[0091] Please refer to the appendix. Figure 4 The step of filling the filter layer between the filter pipe 2 and the well wall near the base well 1 specifically includes the following steps:

[0092] S41, using a prefabricated first isolation pipe 6 and second isolation pipe 7;

[0093] S42, multiple first water passage holes 6a are opened on the pipe wall of the first isolation pipe 6;

[0094] S43, multiple second water passage holes 7a are opened on the pipe wall of the second isolation pipe 7;

[0095] S44, the first isolation pipe 6 and the second isolation pipe 7 are vertically placed into the foundation well 1 using a lifting device. The first isolation pipe 6 is sleeved on the outer wall of the filter pipe 2, and the second isolation pipe 7 is sleeved on the outer wall of the first isolation pipe 6.

[0096] S45, fill the space between the second isolation pipe 7 and the well wall of the base well 1 with the first gravel 10;

[0097] S46, fill the space between the second isolation pipe 7 and the first isolation pipe 6 with the second gravel 9;

[0098] S47, fill the space between the first isolation tube 6 and the filter tube 2 with the third gravel 8.

[0099] Specifically, groundwater sequentially passes through the first gravel 10, the second water passage 7a, the second gravel 9, the second water passage 7a, and the third gravel 8 into the filter pipe 2. The groundwater is filtered through three layers of gravel to reduce the amount of sediment entering the filter pipe 2, thus reducing the chance of the filter pipe 2 being blocked by sediment. After the groundwater enters the filter pipe 2, the sensor located in the filter pipe 2 detects the water quality of the groundwater.

[0100] Please refer to the appendix. Figure 4 The diameter of the third gravel 8 is smaller than that of the second gravel 9, and the diameter of the second gravel 9 is smaller than that of the first gravel 10. The diameter of the first gravel 10 is between 8 mm and 1.2 cm, the diameter of the second gravel 9 is between 5 mm and 7 mm, and the diameter of the third gravel 8 is between 2 mm and 4 mm. The gradually decreasing diameter of the gravel plays a role in filtering impurities in the water layer by layer.

[0101] Please refer to the appendix. Figure 3-4 The first isolation pipe 6 extends out of the wellhead of the base well 1 at one end, and the second isolation pipe 7 is located inside the base well 1 at one end near the wellhead of the base well 1; the cleaning structure for cleaning the pipe cut of the filter pipe 2 at the end away from the bottom of the base well 1 is specifically made by the following steps:

[0102] S51, within the area jointly defined by the side of the second isolation pipe 7 away from the bottom of the foundation well 1 and the side of the first isolation pipe 6 near the well wall of the foundation well 1, the soil 11 is filled by a soil rammer.

[0103] S52, a casting mold is fitted on the outer wall of the end of the first isolation pipe 6 that extends out of the base well;

[0104] S53, an isolation sleeve is installed on the outer wall of the end of the filter pipe 2 that extends out of the base well 1;

[0105] S54, pour concrete into the casting mold so that the concrete wraps around the outer wall of the first isolation pipe 6 extending out of the foundation well 1 and the outer wall of the isolation cylinder.

[0106] S55, after the concrete has solidified into concrete block 12, the isolation tube is removed, so that a sliding hole is formed between the outer wall of the filter tube 2 and the concrete block 12.

[0107] S56, symmetrical grooves 13 are provided on both sides of the inner wall of the sliding hole on the side away from the base well 1;

[0108] S57, a slider 14 for sliding within the slide groove 13 is connected to the side of the filter tube 2 near the slide groove 13;

[0109] S58, a spring 15 is provided in the chute 13, one end of the spring 15 is connected to the side wall of the chute 13 near the base well 1, and the other end is connected to the slider 14.

[0110] Specifically, the rammed earth 11 is used to prevent groundwater from leaking out of the well 1 through the gaps between the first gravel 10 and the second gravel 9. After the pipe cut of the filter pipe 2 is blocked by mud and sand, the filter pipe 2 is pressed and slid towards the bottom of the well 1. During the process, the slider 14 and the spring 15 are squeezed, causing the spring 15 to be compressed. During the sliding process, the outer wall of the filter pipe 2 rubs against the third gravel 8. Then the filter pipe 2 is released, and the spring 15 releases its elastic potential energy to drive the filter pipe 2 to slide away from the bottom of the well 1. During the sliding process, the outer wall of the filter pipe 2 rubs against the third gravel 8. This process is repeated. During the friction between the filter pipe 2 and the third gravel 8, the mud and sand attached to the outer wall of the filter pipe 2 will be removed from the filter pipe 2, thus clearing the pipe cut of the filter pipe 2.

[0111] Please refer to the appendix. Figure 3 The method of constructing a cleaning structure at the end of the filter pipe 2 away from the bottom of the base well 1 for cleaning the pipe cut of the filter pipe 2 also includes the following steps:

[0112] S59, a sealing ring is fitted on the side of the filter tube 2 that contacts the wall of the sliding hole;

[0113] S510, a smooth surface is applied to the wall of the sliding hole so that the wall of the sliding hole can fit tightly with the sealing ring.

[0114] Specifically, through the cooperation between the sealing ring and the sliding mechanism, groundwater can be prevented from flowing out of the well 1 between the filter pipe 2 and the sliding hole.

[0115] Please refer to the appendix. Figure 3 The filter pipe 2 extends out of the sliding hole at one end away from the base well 1. The sealing treatment at the end of the filter pipe 2 away from the bottom of the base well 1 specifically includes the following steps:

[0116] S61, a sealing pipe 16 is embedded on the side of the concrete block 12 away from the foundation well 1 for fitting one end of the filter pipe 2 that extends out of the sliding hole into the casing.

[0117] S62, fill the gap between the sealing tube 16 and the concrete block 12 with sealant;

[0118] S63, a manhole cover 17 is provided on the sealing pipe 16 to seal the end of the sealing pipe 16 facing away from the concrete block 12.

[0119] Specifically, 201 stainless steel manhole cover 17 is selected. The manhole cover 17 has a diameter of 273mm and is 500mm above the ground. The manhole cover 17 is sealed with a special-shaped lock. The manhole cover 17 is equipped with a sign. The manhole cover 17 is made of stainless steel and is used in conjunction with a sealing ring. This can effectively protect the monitoring well from damage caused by silt and river sand flowing into the well after it is submerged during the high water season.

[0120] Please refer to the appendix. Figure 1 The construction process for river and lake monitoring wells also includes the following steps:

[0121] S70, a shelf 18 for contacting the ground is provided around the outer wall of the concrete block 12. The shelf 18 is used to increase the contact area between the concrete block 12 and the ground and prevent the concrete block 12 from sinking.

[0122] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A construction technique for monitoring wells in rivers and lakes, characterized in that, Includes the following steps: Drilling equipment is used to drill vertically downwards into the ground. After reaching the silty sand stratum, drilling is stopped to form a foundation well. The base plate is fixed to the bottom of the base well, and a sliding cylinder with the opening facing upwards is vertically installed on the side of the base plate away from the bottom of the base well, which allows the filter pipe to be inserted. The filter tube is placed vertically into the base well, with one end of the filter tube closest to the bottom of the base well inserted into the slide tube; A filter layer is filled between the filter pipe and the well wall on the side closest to the base well. A cleaning structure is constructed at the end of the filter pipe away from the bottom of the base well for cleaning the pipe cuts. Seal the end of the filter pipe that faces away from the bottom of the base well. The process of filling a filter layer between the filter pipe and the well wall on the side of the filter pipe closest to the base well specifically includes the following steps: Prefabricated first and second isolation pipes are used; Multiple first water passage holes are opened on the wall of the first isolation pipe; Multiple second water passages are opened on the wall of the second isolation pipe; The first isolation pipe and the second isolation pipe are vertically placed into the foundation well using lifting equipment. The first isolation pipe is sleeved on the outer wall of the filter pipe, and the second isolation pipe is sleeved on the outer wall of the first isolation pipe. The first gravel is filled between the second isolation pipe and the wellbore wall of the base well; A second type of gravel is filled between the second isolation pipe and the first isolation pipe; A third type of gravel is filled between the first isolation tube and the filter tube; The first isolation pipe extends out of the wellhead near the base well, while the second isolation pipe is located inside the base well at the same end as the wellhead. The step of creating a cleaning structure at the end of the filter pipe away from the bottom of the base well for cleaning the pipe cuts specifically includes the following steps: Within the area jointly defined by the side of the second isolation pipe away from the bottom of the base well and the side of the first isolation pipe near the well wall, rammed earth is filled using a ramming machine. A casting mold is fitted onto the outer wall of the end of the first isolation pipe that extends out of the foundation well. An isolation sleeve is fitted onto the outer wall of the end of the filter pipe that extends out of the base well. Concrete is poured into the casting mold so that the concrete wraps around the outer wall of the first isolation pipe extending from the foundation well and the outer wall of the isolation cylinder. After the concrete has hardened into a concrete block, the isolation cylinder is removed, so that a sliding hole is formed between the outer wall of the filter tube and the concrete block; The inner wall of the sliding hole on the side away from the base well is symmetrically provided with sliding grooves on both sides; A slider for sliding within the chute is connected to the side of the filter tube near the chute. A spring is installed inside the chute, with one end of the spring connected to the side wall of the chute near the base well and the other end connected to the slider.

2. The construction technology for river and lake monitoring wells according to claim 1, characterized in that, The process involves drilling vertically downwards into the ground using drilling equipment. After reaching a silty sandy stratum, drilling is stopped to form a foundation well. The specific process includes the following steps: Transport the drilling rig to the location where drilling is to be carried out; Replace the drill bit of the drilling rig with a spiral drill bit; The drilling rig drives the auger bit vertically downwards toward the ground, using a rotary drilling method to drill; The auger bit stops drilling downwards after it enters the silty sand layer. The auger bit is removed from the borehole, and the mud and sand inside the borehole are cleaned out to obtain the base well.

3. The construction technology for river and lake monitoring wells according to claim 1, characterized in that, The process of vertically inserting the filter tube into the base well, with one end of the filter tube near the bottom of the base well inserted into the slide tube, specifically includes the following steps: Place the sensor used to detect water quality into the filter tube; Plug both ends of the filter tube with plugs; The filter tube is lifted vertically using a lifting device; When running the well casing, the filter pipe should be placed vertically in the center of the base well, and the upper end of the filter pipe should be kept horizontal. One end of the filter tube near the bottom of the base well is inserted into the slide tube, with a clearance fit between the filter tube and the slide tube, and the end of the filter tube away from the slide tube is located above the base well. After accurately measuring the installation depth of the filter tube, the filter tube is lowered.

4. The construction technology for river and lake monitoring wells according to claim 1, characterized in that, The diameter of the third gravel is smaller than the diameter of the second gravel, and the diameter of the second gravel is smaller than the diameter of the first gravel.

5. The construction technology for river and lake monitoring wells according to claim 1, characterized in that, The method of creating a cleaning structure at the end of the filter pipe away from the bottom of the base well for cleaning the pipe cuts also includes the following steps: A sealing ring is fitted on the side of the filter tube that contacts the wall of the sliding hole; The wall of the sliding hole is smoothed to ensure a tight fit between the hole wall and the sealing ring.

6. The construction technology for river and lake monitoring wells according to claim 1, characterized in that, The end of the filter tube facing away from the base well extends out of the sliding hole, and the sealing treatment of the end of the filter tube facing away from the bottom of the base well specifically includes the following steps: A sealing pipe is embedded on the side of the concrete block away from the foundation well to accommodate one end of the filter pipe extending out of the sliding hole. The gap between the sealing tube and the concrete block is filled with sealant; A manhole cover is installed on the sealing pipe to seal the end of the pipe that faces away from the concrete block.

7. The construction technology for river and lake monitoring wells according to claim 1, characterized in that, It also includes the following steps: A shelf is provided around the outer wall of the concrete block for contact with the ground.

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