Layered water-stopping device

Abstract

The utility model discloses a layered water-stopping device, belonging to the technical field of geological exploration equipment; it comprises an end pipe arranged at the upper end of a drilling hole, used for sending a water-stopping component to a target aquifer and guiding it to a center, and a water-stopping component installed at the lower end of the end pipe, used for consolidating the hole wall of the target aquifer, performing layered water-stopping on the target aquifer and guiding the water of the target aquifer out of the drilling hole; the lower end of the end pipe is threadedly connected with at least one group of water-stopping components; the utility model can play a certain filtering effect on the collected water body, reduce the difficulty of water quality evaluation, and in order to smoothly implement the layered water pumping experiment in the underground wellbore and prevent the collapse of the pumping wellbore, the water-stopping component can also support the hole wall of the aquifer, so that the geological structure maintains a certain stability, the water-stopping performance is highly reliable, and the application conditions are not demanding.

Description

Technical Field

[0001] The utility model relates to a layered water-stopping device, in particular to a layered water-stopping device for hydrogeological exploration, belonging to the technical field of geological exploration equipment. Background Art

[0002] Mineral exploration is a practical geology that studies the geological conditions of mineral formation and distribution, the occurrence law of mineral deposits, the characteristics of ore body changes, and the most effective identification and evaluation methods of industrial mineral deposits. It is highly comprehensive, practical, economical, and policy-oriented. In the process of developing mineral resources, the local hydrogeological conditions should be fully understood first, so the work of hydrogeological exploration is of great significance. Hydrogeological exploration aims to understand the causes, distribution, and movement laws of groundwater and surface water. In hydrogeological exploration, pumping test is an important means to obtain hydrogeological parameters and study the relationship between groundwater recharge and discharge. It can provide basic parameters for water-rich division and groundwater resource calculation. When conducting geological exploration and water extraction or hydrogeological drilling in multi-layer aquifer areas, in order to obtain the water volume, water level, water quality, and water temperature data of each aquifer, it is necessary to observe and pump water tests for each aquifer, so stratified water stopping is required.

[0003] In traditional technology, layered waterstopping generally adopts cement waterstopping, clay waterstopping and other methods. This method is very cumbersome and inconvenient to use, and it is necessary to control the amount of clay and part of cement to ensure excellent isolation effect. It cannot be reused after use, and clay and cement are easy to cause pipeline blockage, thereby reducing work efficiency. In areas with poor rock properties, the supporting structure is unstable, which may cause collapse and seriously affect the smooth progress of geological survey work. Therefore, layered waterstopping devices are used.

[0004] The traditional layered water-stopping device needs to drill the step hole first, and then block the water distribution groove with a rubber ring to achieve the purpose of water stopping and pumping. When extracting water at multiple levels and different depths, it is necessary to drill the step hole and stop the water pumping multiple times, which is inefficient and the water-stopping operation is very inconvenient. In addition, the layered water-stopping device cannot be adjusted according to the required drilling depth during use, especially it is difficult to adapt to the water-stopping requirements of aquifers of different thicknesses, and it is difficult to adjust or freely assemble according to the thickness of the aquifer. Therefore, the flexibility is reduced during use, it is inconvenient to use, and the layered water-stopping effect is not good. In addition, most layered water-stopping devices are equipped with water inlet holes and a filter screen is added to the water inlet hole to filter the water body of the aquifer, but the sediment in the water body will be adsorbed on the filter screen, and the filter screen area is small, which is easy to cause blockage of the mesh and the filter screen, resulting in the inability to collect water, which greatly reduces the working efficiency of the device. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a layered water-stopping device.

[0006] The technical solution adopted by the utility model is: design a layered water-stopping device, which is installed in a drilling hole for use, and includes:

[0007] End pipe: It is set at the upper end of the drilling hole and is used to send the water-stop assembly to the target aquifer and guide it to the center;

[0008] Water-stop assembly: installed at the lower end of the end pipe, used to consolidate the hole wall of the target aquifer, perform stratified water-stopping on the target aquifer, and guide the water of the target aquifer out of the drilling hole;

[0009] The lower end of the terminal pipe is threadedly connected to at least one set of water-stopping components.

[0010] Furthermore, the end tube of the present design includes an extension portion extending into the drilling hole and a guide portion clamped at the upper end of the drilling hole, the extension portion and the guide portion are integrally formed, the extension portion is a circular tube, and the guide portion is a trumpet shape.

[0011] Furthermore, the water-stop assembly described in the present design includes an inner tube and a water-stop sleeve coaxially arranged with the inner tube, the water-stop sleeve is covered on the outside of the inner tube, the water-stop sleeve is an inflatable and deflated structure, when the water-stop sleeve is inflated, the water-stop sleeve blocks the upper and lower ends of the target aquifer; the inner tube is provided with dense filter holes connected to the water-stop sleeve, the water-stop sleeve is connected to the target aquifer, the water of the target aquifer passes through the water-stop sleeve and flows into the inner tube, and a layer of filter net is also provided outside the inner tube.

[0012] Furthermore, the water-stop assembly of the present design also includes a water pipe, and sealing plates are respectively provided inside the upper and lower ends of the inner pipe. One end of the water pipe passes through the sealing plate at the upper end of the inner pipe, and the other end extends out of the drilling hole.

[0013] Furthermore, the water-stop sleeve of the present design includes an upper water-stop bag, a lower water-stop bag, a connecting pipe and a consolidation cage. The outer edges of the upper water-stop bag and the lower water-stop bag are connected by a consolidation cage. The upper water-stop bag and the lower water-stop bag are connected by a connecting pipe. The upper water-stop bag and the lower water-stop bag are respectively provided with inflation nozzles. The upper water-stop bag and the lower water-stop bag are respectively arranged at the upper and lower ends of the inner tube to seal the upper and lower ends of the target aquifer.

[0014] Furthermore, a group of water-stopping components is provided at the lower end of the end pipe of the present design, wherein an inflation tube is provided on one inflation nozzle of the water-stopping component, and a plugging cap is provided on the other inflation nozzle.

[0015] Furthermore, the present design also includes a ventilation pipe, at least two groups of water-stop components are arranged at the lower end of the end pipe, the water-stop components are threadedly connected to each other, adjacent inflation nozzles between two adjacent groups of water-stop components are connected through the ventilation pipe, an inflation pipe is arranged on the inflation nozzle above the topmost water-stop component, and a plugging cap is arranged on the inflation nozzle below the bottommost water-stop component, and the water pipes of the water-stop components located below pass through the sealing plates of the water-stop components above them in sequence and then extend out of the drilled holes.

[0016] Furthermore, in the present design, 3-6 connecting holes are arranged on the sealing plate, and the water pipe passes through the sealing plate through the connecting holes, and plugs are arranged on the connecting holes that are not penetrated by the water pipe.

[0017] Furthermore, the guide portion of the end tube of the present design is provided with a clearance window, and the inflation tube passes through the clearance window to pass through the drilling hole; two ring plates are respectively provided at the upper and lower ends of the inner tube, and a groove is formed between the two ring plates, and the upper water-stop bag and the lower water-stop bag are respectively clamped in the groove.

[0018] Furthermore, the design also includes a probe, the probe is threadedly connected to the inner tube of the bottom layer, and the lower end of the probe is a conical head.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The utility model sends the water-stop component to the target aquifer and guides it to the center by arranging the end pipe; consolidates the hole wall of the target aquifer, performs layered water-stopping on the target aquifer, and guides the water of the target aquifer out of the drilling hole by arranging the water-stop component; and the water-stop component and the end pipe, as well as the water-stop component and the water-stop component can be freely assembled to meet the water-stopping requirements of different levels and depths; when extracting water at multiple levels and different depths, drilling and water-stopping pumping can be performed at one time, the efficiency is low, the water-stopping operation is high, and it is convenient and quick.

[0021] And because the water-stop components can be assembled freely, the layered water-stop device can be adjusted according to the required drilling depth when in use, especially to adapt to the water-stopping needs of aquifers of different thicknesses. It can be adjusted or freely assembled according to the thickness of the aquifer. Therefore, its flexibility during use is greatly improved, it is easy to use, and the layered water-stopping effect is good.

[0022] In addition, the utility model sets filter holes in the inner tube, and combined with the filter screen, most of the inner tube body can be used to filter the water in the aquifer. The filter screen area is large, and the mud and sand in the water body are not easy to cause blockage to the filter holes and the filter screen, which does not affect the collection of the aquifer water, thereby ensuring the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the utility model being installed in a drilling hole (detection well).

[0025] Figure 2 It is a schematic diagram of the axonometric drawing of the utility model.

[0026] Figure 3 It is a schematic diagram of the water-stop assembly of the utility model.

[0027] In the figure: 1. drilling hole; 2. end pipe; 3. water-stop assembly; 4. inner pipe; 5. water-stop sleeve; 6. filter screen; 7. water guide pipe; 8. sealing plate; 9. upper water-stop bag; 10. lower water-stop bag; 11. connecting pipe; 12. consolidation cage; 13. inflation nozzle; 14. plugging cap; 15. ventilation pipe; 16. plug; 17. make way window; 18. ring plate; 19. probe; 20. inflation pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] like Figure 1-Figure 3 As shown: a layered water-stopping device, installed in a drilling hole 1, is used to perform layered water-stopping and pumping tests on each aquifer during geological exploration, and includes:

[0032] End pipe 2: arranged at the upper end of the drilling hole 1, used to deliver the water-stop assembly 3 to the target aquifer and has a certain function of guiding the water-stop assembly 3 to the center in the drilling hole 1;

[0033] Water-stop assembly 3: installed at the lower end of the end pipe 2, used to consolidate the hole wall of the target aquifer, perform stratified water-stopping on the target aquifer, and guide the water of the target aquifer out of the drilling hole 1;

[0034] The lower end of the end pipe 2 is threadedly connected to at least one set of water-stopping components 3, such as one set, two sets, three sets or even four sets, for situations where one, two, three or even four target aquifers need to be water-stopped. The end pipe 2 and the water-stopping components 3, and the water-stopping components 3 are connected by threads, respectively, for flexible assembly and use.

[0035] Example 2

[0036] This embodiment is based on the embodiment 1, and further optimizes and refines the structure of the end pipe 2, specifically:

[0037] The end pipe 2 includes an extension portion extending into the drilling hole 1 and a guide portion clamped at the upper end of the drilling hole 1. The extension portion and the guide portion are integrally formed, the extension portion is a round tube, and the guide portion is a trumpet. When in use, a water stop assembly 3 is installed at the lower end of the end pipe 2, and then the entire water stop device is lowered into the drilling hole 1 through the end pipe 2 until the water stop assembly 3 reaches the target aquifer position. At this time, the guide portion of the end pipe 2 is clamped at the upper end of the drilling hole 1, so that the entire water stop device is centered in the drilling hole 1.

[0038] Example 3

[0039] This embodiment further optimizes and refines the structure of the water stop assembly 3 on the basis of the embodiment 2, specifically:

[0040] The water-stop assembly 3 includes an inner tube 4 and a water-stop sleeve 5 coaxially arranged with the inner tube 4, the water-stop sleeve 5 is coated on the outside of the inner tube 4, and the water-stop sleeve 5 is an inflatable and deflated structure. When the water-stop sleeve 5 is inflated, the water-stop sleeve 5 blocks the upper and lower ends of the target aquifer. Specifically, a gap is formed between the inner tube 4 and the drilling hole 1, and the upper and lower ends of the gap between the inner tube 4 and the drilling hole 1 at the target aquifer are blocked by the water-stop sleeve 5 to achieve the purpose of stratified water stopping; the inner tube 4 is provided with dense filter holes connected with the water-stop sleeve 5, and the water-stop sleeve 5 is connected with the target aquifer. The water of the target aquifer flows into the inner tube 4 after passing through the water-stop sleeve 5, and the inner tube 4 is located at the target aquifer. The pipe body has dense filter holes throughout, the filtration area is large, not easy to be blocked, and the use is more durable. A layer of filter net 6 is also provided outside the inner tube 4 to improve the sediment filtering effect, so that the water in the inner tube 4 is purer.

[0041] Example 4

[0042] This embodiment further optimizes and refines the structure of the water stop assembly 3 on the basis of the embodiment 3, specifically:

[0043] The water-stop assembly 3 also includes a water pipe 7, and sealing plates 8 are respectively provided inside the upper and lower ends of the inner pipe 4. The upper and lower ends of the inner pipe 4 located in the target aquifer are sealed by the sealing plates 8 to collect water from the target aquifer. One end of the water pipe 7 passes through the sealing plate 8 at the upper end of the inner pipe 4 to enter the inner pipe 4, and the other end extends out of the drilling hole 1 to extract the water from the target aquifer. It can be understood that a water pump is usually connected to the water pipe 7 to extract the water from the target aquifer.

[0044] Example 5

[0045] This embodiment is based on the embodiment 4, and further optimizes and refines the structure of the water stop sleeve 5, specifically:

[0046] The water-stopping sleeve 5 includes an upper water-stopping bag 9, a lower water-stopping bag 10, a connecting pipe 11 and a consolidation cage 12. The outer edges of the upper water-stopping bag 9 and the lower water-stopping bag 10 are connected by the consolidation cage 12. When the water-stopping sleeve 5 is inflated, the consolidation cage 12 is close to the pore wall of the target aquifer to form a support. The consolidation cage 12 can be surrounded by multiple columns made of the same material as the airbag; the upper water-stopping bag 9 and the lower water-stopping bag 10 are connected by the connecting pipe 11. The upper water-stopping bag 9 and the lower water-stopping bag 10 are respectively provided with an inflation nozzle 13. The upper water-stopping bag 9 and the lower water-stopping bag 10 are respectively provided at the upper and lower ends of the inner tube 4 to block the upper and lower ends of the target aquifer. Specifically, when the water-stopping device is installed in place, the upper water-stopping bag 9 and the lower water-stopping bag 10 swell and block the upper and lower ends of the target aquifer by inflating the water-stopping sleeve 5.

[0047] Example 6

[0048] In this embodiment, a set of water stop components 3 is arranged at the lower end of the end pipe 2, wherein one of the air nozzles 13 of the water stop component 3 is provided with an air pipe 20, and the other air nozzle 13 is provided with a plugging cap 14. This embodiment is aimed at the case where there is only one target aquifer.

[0049] Example 7

[0050] In this embodiment, the water stop device also includes a vent pipe 15, at least two groups of water stop components 3 are arranged at the lower end of the end pipe 2, the water stop components 3 are threadedly connected to each other, and the adjacent air nozzles 13 between two adjacent groups of water stop components 3 are connected through the vent pipe 15, the air nozzle 13 above the uppermost water stop component 3 is provided with an air pipe 20, and the air nozzle 13 below the lowermost water stop component 3 is provided with a plugging cap 14, and the water guide pipe 7 of the water stop component 3 located below passes through the sealing plate 8 of the water stop component 3 above it in sequence and then extends out of the drilling hole 1. This embodiment is for the case where there are two or more target aquifers.

[0051] Example 8

[0052] This embodiment further optimizes and refines the structure of the sealing plate 8 on the basis of Embodiment 6 or 7, specifically:

[0053] In this embodiment, six communication holes are arranged in an array on the sealing plate 8, and the water pipe 7 passes through the sealing plate 8 through the communication holes, and a plug 16 is arranged on the communication hole that is not penetrated by the water pipe 7. A nut column may be arranged outside the communication hole, and then the plug 16 is threadedly connected to the nut column. A dredging hole is also arranged in the middle of the sealing plate 8 at the lower end of the inner tube 4, and a plug cover is arranged on the dredging hole to facilitate cleaning of the inner cavity of the inner tube 4.

[0054] Example 9

[0055] This embodiment is based on the embodiment 8, and further optimizes and refines the structure of the end pipe 2, specifically:

[0056] The guide portion of the end tube 2 is provided with a clearance window 17, and the inflation tube 20 passes through the clearance window 17 to pass through the drilling hole 1; two ring plates 18 are respectively provided at the upper and lower ends of the inner tube 4, and a groove is formed between the two ring plates 18, and the upper water-stopping bag 9 and the lower water-stopping bag 10 are respectively stuck in the groove, so that the connection is more reliable.

[0057] In this embodiment, the water-stopping device further comprises a probe 19 , and the probe 19 is threadedly connected to the inner tube 4 of the lowest layer. The lower end of the probe 19 is a conical head, which is convenient for passing through obstacles and entering the drilling hole 1 .

[0058] It is understandable that in the above embodiments, threaded structures are respectively provided at the lower end of the end tube 2, the upper and lower ends of the inner tube 4, etc., so as to realize threaded connection, and the specific threaded structures are not shown in the drawings; the water pipe 7 and the connecting hole can be sealed by using a sealing ring, a threaded cap, a sealant or an interference fit, etc., and the plug cap 14 and the inflation nozzle 13, and the plug 16 and the connecting hole can also be connected by threaded connection for quick disassembly and assembly; the connection between the connecting pipe 11 and the water-stop bag, the connection between the vent pipe 15 and the inflation nozzle 13, and the connection between the inflation pipe 20 and the inflation nozzle 13 can also be connected by threaded connection for easy disassembly and assembly. The above connections can all adopt existing technical means, which will not be repeated.

[0059] When using the water-stop device provided by the present application, select the appropriate number and height of water-stop components 3 as needed, then assemble the water-stop components 3 with the water-stop components 3 (including the connection between the water-stop sleeves 5 of the two), and the water-stop components 3 with the end pipe 2, install the inflation tube 20 and seal the redundant connecting holes, inflation nozzles 13, etc. (at this time, the water-stop sleeve 5 is in an uninflated and contracted state, and the consolidation cage 12 is not propped up, so that a certain gap will be reserved between the water-stop component 3 and the wall of the drilling hole 1 to ensure the smooth lowering of the water-stop device.), and then lower it. The water-stop device enters the borehole 1, and after being lowered into place, the water-stop sleeves 5 of each water-stop component 3 are inflated through the inflation device and the inflation pipe 20, and all the water-stop bags swell up and drive the consolidation cages 12 and the like to be propped up. The water-stop bags and the consolidation cages 12 are tightly attached to the hole wall of the target aquifer (the consolidation cages 12 can provide certain support to the hole wall of the pumping well or the borehole 1, and the borehole at the aquifer is not easy to collapse and break, thereby ensuring the smooth progress of the entire operation process), thereby achieving layered water-stopping, and then a pumping test can be carried out on each target aquifer through the water conduit 7.

[0060] It is understandable that water-stopping components 3 of different heights can be selected for matching use according to aquifers of different thicknesses.

[0061] Waterstopping in stratified pumping tests is an important task in the field of engineering geological surveys. Usually, the quality of the waterstopping effect can directly affect the accuracy of the entire pumping test. The waterstopping device of the present application has a good waterstopping effect, is easy to operate, and can consolidate the aquifer to prevent collapse from affecting operations; it can quickly collect hydrological data of each underground aquifer and avoid mixing of water in different aquifers.

[0062] In addition, in the description of the present utility model, unless otherwise specified, if the terms "multiple", "multiple roots", "multiple groups" are used, they mean two or more than two, and "several", "several roots", "several groups" mean one or more than one. In the description of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, it is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, if the terms "first", "second", "third" are used, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0063] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A layered water-stopping device installed in a drilling hole, characterized in that: include: End pipe: It is set at the upper end of the drilling hole and is used to send the water-stop assembly to the target aquifer and guide it to the center; Water-stop assembly: installed at the lower end of the end pipe, used to consolidate the hole wall of the target aquifer, perform stratified water-stopping on the target aquifer, and guide the water of the target aquifer out of the drilling hole; The lower end of the terminal pipe is threadedly connected to at least one set of water-stopping components.

2. The layered water-stopping device according to claim 1, characterized in that: The end pipe comprises an extension portion extending into the drilling hole and a guide portion clamped at the upper end of the drilling hole, the extension portion and the guide portion are integrally formed, the extension portion is in the shape of a circular tube, and the guide portion is in the shape of a trumpet.

3. The layered water-stopping device according to claim 1 or 2, characterized in that: The water-stop assembly includes an inner tube and a water-stop sleeve coaxially arranged with the inner tube, the water-stop sleeve is coated on the outside of the inner tube, and the water-stop sleeve is an inflatable and deflated structure. When the water-stop sleeve is inflated, the water-stop sleeve blocks the upper and lower ends of the target aquifer; the inner tube is provided with dense filter holes connected with the water-stop sleeve, the water-stop sleeve is connected with the target aquifer, and the water of the target aquifer flows into the inner tube after passing through the water-stop sleeve, and a layer of filter net is also provided outside the inner tube.

4. The layered water-stopping device according to claim 3 is characterized in that: The water-stop assembly also includes a water pipe, and sealing plates are respectively arranged inside the upper and lower ends of the inner pipe. One end of the water pipe passes through the sealing plate at the upper end of the inner pipe, and the other end extends out of the drilling hole.

5. The layered water-stopping device according to claim 4, characterized in that: The water-stop sleeve includes an upper water-stop bag, a lower water-stop bag, a connecting pipe and a consolidation cage. The outer edges of the upper water-stop bag and the lower water-stop bag are connected by a consolidation cage. The upper water-stop bag and the lower water-stop bag are connected by a connecting pipe. The upper water-stop bag and the lower water-stop bag are respectively provided with inflation nozzles. The upper water-stop bag and the lower water-stop bag are respectively arranged at the upper and lower ends of the inner tube to seal the upper and lower ends of the target aquifer.

6. The layered water-stopping device according to claim 5, characterized in that: A set of water-stopping components is arranged at the lower end of the end pipe, wherein one of the inflation nozzles of the water-stopping components is provided with an inflation tube, and the other inflation nozzle is provided with a plugging cap.

7. The layered water-stopping device according to claim 5, characterized in that: It also includes a ventilation pipe, at least two groups of water-stop components are arranged at the lower end of the end pipe, the water-stop components are threadedly connected to each other, and the adjacent inflation nozzles between two adjacent groups of water-stop components are connected through the ventilation pipe, the inflation nozzle above the uppermost water-stop component is provided with an inflation pipe, and the inflation nozzle below the lowermost water-stop component is provided with a plugging cap, and the water pipes of the water-stop components located below pass through the sealing plates of the water-stop components above them in sequence and then extend out of the drilling holes.

8. The layered water-stopping device according to claim 7, characterized in that: The sealing plate is provided with 3-6 communicating holes, and the water pipe passes through the sealing plate through the communicating holes, and plugs are provided on the communicating holes that are not penetrated by the water pipe.

9. The layered water stopping device according to claim 8, characterized in that: The guide portion of the end tube is provided with a clearance window, and the inflation tube passes through the clearance window to pass through the drilling hole; two ring plates are respectively provided at the upper and lower ends of the inner tube, and a groove is formed between the two ring plates, and the upper water-stopping bag and the lower water-stopping bag are respectively clamped in the groove.

10. The layered water stopping device according to claim 9, characterized in that: It also includes a probe, which is threadedly connected to the inner tube of the lowest layer, and the lower end of the probe is a conical head.

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