Soil groundwater remediation agent injection device and method

Abstract

The invention discloses a soil groundwater remediation agent injection device and method.The device is arranged in an excavated soil layer hole and comprises a flexible air bag, the flexible air bag further comprises an air bag body, the upper end and the lower end of the air bag body are made of hard materials, and the wall face of the air bag body is made of flexible materials; a pipeline penetrates between the upper end and the lower end in a sealed manner and is used for accommodating a medicine injection pipeline, an inflation pipeline and an air pressure monitoring line; the injector is arranged on the outer side of the flexible wall surface of the air bag body and is communicated with the medicine injection pipeline; the whole injector is arc-shaped or annular, the inner side of the injector is attached to the flexible wall surface, and medicament injection holes are uniformly formed in the outer side of the injector; after the air bag body is inflated and expanded, in the medicament injection process, the injector abuts against the height position of the soil layer to be repaired, and the flexible wall face is tightly attached to the wall face of the hole. According to the device, injection repairing work of the medicament at different depths can be rapidly achieved only by drilling a proper simple hole underground, and recycling of the medicament injection device can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil and groundwater restoration, and in particular to a soil and groundwater restoration agent injection device and method. Background Art

[0002] With the development of industrialization, urbanization and agricultural modernization, the chemical industry, mining, metal smelting, the use of pesticides and fertilizers, and the discharge of domestic wastewater are constantly causing soil and groundwater environmental safety problems. The discharge of three wastes and accidental leakage of storage devices and transportation pipelines will pose a serious threat to soil and groundwater. For example, mine wastewater and industrial water from chemical plants will cause pollutants to deposit in soil and groundwater. In agriculture, there are more and more soil and groundwater pollution problems caused by the large-scale use of fertilizers and pesticides. Urban residential areas discharge a large amount of domestic sewage and solid waste every day, including organic matter containing microbial nutrients such as carbohydrates, nitrogen, phosphorus, and sulfur, and a variety of pathogenic microorganisms. When these pollutants enter the water body, they cause a large amount of dissolved oxygen in the water. Under the action of anaerobic bacteria, it is easy to produce odorous substances, and at the same time cause the growth and spread of pathogens and viruses. Therefore, soil and groundwater remediation needs to be implemented for a long time.

[0003] Soil and groundwater remediation can be carried out by chemical remediation, which requires the injection of chemicals into the soil layer. Existing injection devices generally require the construction of complex agent injection wells, and the injection devices are difficult to reuse. For example, Chinese patent application CN115159600A discloses a barrier and a multi-depth agent injection method for soil and groundwater remediation. The barrier in this scheme includes a tube body, the upper end of the tube body is connected to a first flange, the first flange is provided with an exhaust port, the lower surface of the first flange is connected to a sealing assembly, the tube body passes through the sealing assembly, the lower side of the sealing assembly is connected to a plate body, and the plate body is bent into a tubular shape and surrounds the outside of the tube body; the multi-depth agent injection method for soil and groundwater remediation includes connecting the barrier to the first pipe, and the first pipe passes through the barrier, and the first pipe with the barrier is extended into the interior of the well pipe, and the barrier blocks the well pipe. Although this solution can achieve chemical injection repair at different depths through a repair well, it requires the construction of a complex chemical injection well with high requirements on specifications and construction technology, a large amount of work, and after completion it can only be abandoned on site or the injection well needs to be excavated and cleaned; the barrier is complex in design, and the rubber sealing pad is easily worn during the up and down movement, resulting in a poor seal; the rubber hose is connected to the surface wellhead at the exhaust port, so that the air at the lower screen section is discharged from this exhaust port, which is prone to the problem of chemical backflow.

[0004] Therefore, there is an urgent need for a soil and groundwater remediation agent injection device and method, which can avoid the construction of complex agent injection wells and the injection device can be easily reused.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a soil and groundwater remediation agent injection device and method, which only requires drilling suitable simple holes underground to quickly implement agent injection and remediation work at different depths, and can also achieve the recycling and reuse of the agent injection device.

[0007] Another object of the present invention is to provide a soil and groundwater remediation agent injection device and method, which can not only prevent the hole wall from collapsing or soil from entering the well, but also effectively prevent the agent at the agent injector from flowing upward or downward to other deep soil layers.

[0008] To achieve the above-mentioned purpose, according to the first aspect of the present invention, there is provided a soil and groundwater remediation agent injection device, which is arranged in an excavated soil hole and includes a flexible airbag, and the flexible airbag further includes: an airbag body, whose upper and lower ends are made of hard materials and the wall surface is made of flexible materials; a pipe is sealed and passes through the upper and lower ends, and the pipe is used to accommodate an injection pipeline, an inflation pipeline and an air pressure monitoring circuit; an injector, which is arranged on the outside of the flexible wall surface of the airbag body and is connected to the injection pipeline; the injector is arc-shaped or annular as a whole, and the inner side of the injector is in contact with the flexible wall surface, and agent injection holes are evenly arranged on the outside; after the airbag body is inflated and expanded and during the agent injection process, the injector rests on the height of the soil layer to be repaired and the flexible wall surface is in close contact with the wall surface of the hole.

[0009] Furthermore, in the above technical solution, the airbag body can be a single body structure, and the injector can be set at different heights for fixed-depth and layered injection of the repair agent.

[0010] Furthermore, in the above technical solution, the airbag body can also be composed of multiple monomer structures connected in series through pipelines, and the injector can be set in the middle of each monomer structure to repair the situation where the different usage depths of the medicine are far apart.

[0011] Furthermore, in the above technical solution, the airbag body can also be a single body structure including multiple sub-airbags, and adjacent sub-airbags share the end faces of hard materials. The injector can be arranged in the middle of each sub-airbag or at the end faces of adjacent sub-airbags, which is used to repair the situation where the different usage depths of the repair agent are far apart and the injection of the agent needs to be independently controlled at different depths.

[0012] Furthermore, in the above technical solution, the upstream of the drug injection pipeline can be connected to the medicine tank, the drug injection pump and the first pressure gauge in sequence.

[0013] Furthermore, in the above technical solution, an air pump and a valve may be provided in sequence upstream of the air filling pipeline.

[0014] Furthermore, in the above technical solution, the air pressure monitoring circuit may be provided with a pressure sensor located in the airbag body and a second pressure gauge for measuring the air pressure.

[0015] Furthermore, in the above technical solution, the injector can be connected to the injection pipeline through a branch pipe; the injection hole on the injector is a one-way hole.

[0016] Furthermore, in the above technical solution, the device of the present invention can be applied to the chemical remediation of the soil aeration zone and saturated zone.

[0017] To achieve the above-mentioned purpose, according to the second aspect of the present invention, there is provided a method for injecting a soil and groundwater remediation agent, using the aforementioned device, comprising the following steps: A. placing an uninflated airbag body into the excavated soil hole at the depth to be repaired; B. inflating the airbag body through an inflation pipeline to expand the airbag and reach a preset pressure, at which time the injector is against the height of the soil layer to be repaired and the flexible wall of the airbag body is in close contact with the hole wall; C. stopping inflation, starting the injection process and maintaining the set injection pressure; D. the agent passes through the airbag body through the injection pipeline and enters the injector, and then enters the contaminated soil layer through the injection hole; during the injection process, when the pressure near the injector increases and causes the airbag to be squeezed, it is re-inflated to ensure that the airbag is always in close contact with the hole wall to prevent the agent from flowing to other soil layer depths.

[0018] Furthermore, in the above technical solution, when the airbag body adopts a single body structure, the repair agent can be injected in layers at a fixed depth by injectors of different heights.

[0019] Furthermore, in the above technical solution, when the airbag body adopts a plurality of monomer structures connected in series, the repair agent can be injected into the contaminated soil layer at different depths by injectors arranged on different monomer structures.

[0020] Furthermore, in the above technical solution, each airbag monomer is inflated from bottom to top in sequence during the inflation process. After each airbag monomer is inflated, the water level in the hole rises briefly and slowly falls back to stabilize, and the preset pressure is reached in the airbag monomer before the next airbag monomer is inflated.

[0021] Furthermore, in the above technical solution, when the airbag body adopts a single structure including multiple sub-airbags, the repair agent can be injected into the contaminated soil layer at different depths by injectors arranged on different sub-airbag structures, and the agent injection on each sub-airbag can be independently controlled.

[0022] Furthermore, in the above technical solution, each sub-airbag is inflated sequentially from bottom to top during the inflation process. After each sub-airbag is inflated, the water level in the hole rises briefly and slowly falls back to stabilize, and the preset pressure is reached in the sub-airbag before the next sub-airbag is inflated.

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

[0024] 1) By using the reagent injection device of the present invention, there is no need to build a complex reagent injection well. Only a suitable simple hole needs to be drilled underground to quickly realize the injection and repair work of the reagent at different depths, and the reagent injection device can be recycled and reused;

[0025] 2) The side wall of the airbag used in the present invention is made of flexible material, and the upper and lower ends are made of hard material; a cylindrical pipe runs through the middle of the airbag, which can be used for the injection pipeline, inflation pipeline and / or air pressure monitoring line to pass through. The flexible airbag is cylindrical in the inflated state, and will gradually expand as the internal pressure of the airbag increases, and can fit tightly to the borehole wall and hold it tightly to prevent the hole wall from collapsing or soil from entering the well, and at the same time prevent the agent at the agent injector from flowing upward or downward to other deep soil layers;

[0026] 3) When the airbag body used in the present invention is a monomer structure, the injector can be set at different heights to achieve fixed-depth and layered injection of the repair agent; when the longitudinal range of the pollution is relatively large, multiple airbag monomers can be set in series, which not only avoids the use of too long airbags, reduces the difficulty of customization, but also reduces the cost of use; when the longitudinal range of the pollution is relatively large, a monomer structure with multiple sub-airbags can also be used, which can not only cover a larger span of pollution depth, but also the injection of the agent can be controlled separately, and it is more adaptable to the pollution situation on site;

[0027] 4) When the present invention adopts a solution of multiple series-connected airbag monomers or one airbag monomer containing multiple sub-airbags, the inflation order is that the lower airbag (or lower sub-airbag) is inflated first, and then inflated upwards. Such an inflation order can effectively avoid the water in the inflation process from being unable to be discharged in time, requiring a higher inflation pressure to make the airbag close to the inner wall of the hole, and avoiding the risk of airbag rupture;

[0028] 5) The present invention monitors the air pressure in the airbag in real time during the injection process. When the pressure near the injector increases and causes the airbag to be squeezed, the inflation pump can be restarted to further inflate the airbag to ensure that the airbag is always close to the wall of the hole to prevent the agent from flowing to other soil layer depths.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a connection diagram of the soil and groundwater remediation agent injection device of the present invention (the airbag body adopts a single airbag, and two groups of agent injectors are arranged at different heights).

[0031] Figure 2 It is a schematic diagram of the structure of the airbag body of the present invention using multiple series-connected single airbags (each single airbag is provided with a group of drug injectors).

[0032] Figure 3 It is a schematic structural diagram of an airbag body of the present invention that adopts a single airbag with multiple sub-airbags (each sub-airbag is provided with a group of drug injectors).

[0033] Figure 4 It is a schematic diagram of the application of the soil groundwater remediation agent injection device of the present invention in the soil saturated zone.

[0034] Figure 5 It is a schematic diagram of the application of the soil groundwater remediation agent injection device of the present invention in different depth pollution of the soil aeration zone and saturated zone.

[0035] Figure 6 The schematic diagram of the structure of the drug injector of the present invention (wherein Figure 6 -A is a schematic diagram from top view; Figure 6 -B is a schematic diagram of the outer side of the arc-shaped injector).

[0036] Description of main reference numerals:

[0037] 1-airbag monomer, 11-upper end surface, 12-lower end surface, 13-pipeline, 131-drug injection pipeline, 1310-branch pipe, 132-inflation pipeline, 133-air pressure monitoring line, 14-injector, 140-outer side of the injector, 141-injection hole, 142-connecting thread, 15-pressure sensor;

[0038] 1-1-first airbag, 1-2-second airbag, 1-3-third airbag; 1A-first sub-airbag, 1B-second sub-airbag, 1C-third sub-airbag;

[0039] 2-air pump, 3-valve, 4-medicine tank, 5-medicine injection pump, 6-first pressure gauge, 7-second pressure gauge; 100-hole in the excavated soil layer. DETAILED DESCRIPTION

[0040] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0041] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0042] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0043] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0044] like Figure 1 As shown, the present invention provides a soil groundwater repair agent injection device, which is arranged in an excavated soil hole 100, including a flexible airbag, and the flexible airbag further includes: an airbag body ( Figure 1 The airbag monomer 1) and the injector 14 in it. The upper and lower ends of the airbag body (i.e., the upper end surface 11 and the lower end surface 12) are made of hard materials and the wall surface is made of flexible materials. A pipe 13 is sealed and penetrated between the upper end surface 11 and the lower end surface 12, and the pipe 13 is used to accommodate the injection pipeline 131, the inflation pipeline 132 and the air pressure monitoring line 133. Furthermore, the upstream of the injection pipeline 131 is connected to the medicine tank 4, the injection pump 5 and the first pressure gauge 6 in sequence. The inflation pipeline 132 is provided with an inflation pump 2 and a valve 3 in sequence upstream. The air pressure monitoring line 133 is provided with a pressure sensor 15 located in the airbag body and a second pressure gauge 7 for measuring air pressure. The injector 14 is arranged on the outside of the flexible wall surface of the airbag body and is connected to the injection pipeline 131; further reference Figure 6 (include Figure 6-A and 6-B), the injector 14 is arc-shaped or annular as a whole, the inner side of the injector is in contact with the flexible wall surface, and the outer side surface 140 is evenly provided with agent injection holes 141. After the airbag body is inflated and the agent is injected, the injector 14 is against the height of the soil layer to be repaired and the flexible wall surface is in close contact with the wall surface of the hole 100.

[0045] The flexible airbag used in the present invention has the characteristics of high strength and high flexibility. The upper and lower ends are made of hard materials. A cylindrical pipe runs through the middle of the airbag. The pipe material is preferably aluminum, or other high-strength hard materials can be used to connect the upper and lower ends of the airbag. The upper and lower ends of the pipe can be opened for the passage of injection pipelines, inflation pipelines and / or air pressure monitoring lines, but the gas space inside the airbag is sealed. When a single airbag unit is used, only the cylindrical pipe opening is provided at the lower end of the airbag unit, and a pressure sensor (sensing part is provided inside the airbag) and an inflation pipe interface are provided at the upper end of the airbag unit. The flexible airbag is cylindrical in the inflated state, and will gradually expand as the pressure inside the airbag increases. It can fit tightly against the borehole wall and hold tightly to prevent the hole wall from collapsing or soil from entering the well, and at the same time prevent the agent at the agent injector from flowing upward or downward to other deep soil layers. When the device of the present invention is used, extraction wells can be arranged around the excavated hole to increase the diffusion radius of the agent.

[0046] Further Figure 1 As shown, when the airbag body used is a single body structure, the injector 14 can be set at different height positions ( Figure 1 Two groups of injectors 14 are shown, which are located at different heights respectively, and are used for fixed-depth and layered injection of repair agents. Specifically, the airbag monomer 1 is inflated through the sequentially connected air pump 2, valve 3, and air filling pipeline 132. After the internal pressure of the airbag monomer reaches a preset value as measured by the pressure sensor 15 and the second pressure gauge 7, the air pump 2 stops working and the air filling valve 3 is closed. The present invention realizes the injection of agents through the sequentially connected medicine tank 4, injection pump 5, first pressure gauge 6, injection pipeline 131, branch pipe 1310 and injector 14. The arc-shaped or annular injector 14 can ensure that its inner surface can be tightly attached to the outer surface of the flexible airbag. The inner surface is provided with a connecting port (not shown in the figure), which can be connected to the agent injection branch pipe 1310 through the connecting port (not shown in the figure) on the side wall of the flexible airbag. That is, the injector 14 is connected to the injection pipeline 131 through the branch pipe 1310. In order to avoid the backflow of the agent, the injection hole 141 on the injector 14 is a one-way hole (reference Figure 6 ).

[0047] Further Figure 2 As shown, when the longitudinal range of the pollution is relatively large, multiple airbag monomers can be arranged in series ( Figure 2Three airbag monomers are shown, namely the first airbag 1-1, the second airbag 1-2 and the third airbag 1-3), to ensure that the entire contaminated cross-section can be covered. Specifically, the airbag body is composed of multiple monomer structures connected in series through a pipe 13, and the injector 14 is arranged in the middle of each monomer structure, which is used to repair the situation where the different use depths of the repair agent are far apart. When the span of the contamination depth is relatively large, if one airbag monomer is used for repair, the length of the airbag needs to be increased. In this scenario, multiple airbag monomers can be placed at different contamination depths of the hole, which not only avoids the use of too long airbags and reduces the difficulty of customization, but also reduces the cost of use. The inflation order is that the lower airbag is inflated first, and then upward.

[0048] Further Figure 3 As shown, when the longitudinal range of the pollution is relatively large, a single body structure with multiple sub-airbags can also be used ( Figure 3 An airbag monomer with three sub-airbags is shown, namely, the first sub-airbag 1A, the second sub-airbag 1B and the third sub-airbag 1C. Adjacent sub-airbags share the end face of the hard material. The injector 14 can be set in the middle of each sub-airbag or at the end face of the adjacent sub-airbag (not shown in the figure). The use of such an airbag structure can not only cover a larger span of pollution depth, but also the injection of the agent can be controlled separately, and it is more adaptable to the pollution situation on site. That is, when the span of the pollution depth is large or small, the use of an airbag monomer with multiple sub-airbags can adapt to the on-site situation. When the span is not large, one sub-airbag can be inflated and the agent can be injected. When the span is large, two or more sub-airbags can be selected according to the on-site situation to be inflated and the agent can be injected into the soil layers at different heights. The inflation order is still to inflate the lower sub-airbags first, and then upwards.

[0049] It should be noted here that the above-mentioned different forms of the agent injection device of the present invention can be applied to the agent remediation of the soil aeration zone and saturated zone.

[0050] The present invention also provides a method for injecting a soil and groundwater remediation agent, using any of the above-mentioned agent injection devices, comprising the following steps:

[0051] Step S101, placing the uninflated airbag body into the excavated soil hole at the depth to be repaired. The airbag body can be one airbag monomer, multiple airbag monomers connected in series, or one airbag monomer including multiple sub-airbags;

[0052] Step S102, inflate the airbag body through the inflation pipeline to expand the airbag and reach the preset pressure. At this time, the injector is against the height of the soil layer to be repaired and the flexible wall of the airbag body is close to the wall of the hole. Specifically, when multiple airbag monomers are used in series, each airbag monomer is inflated from bottom to top in the inflation process. After each airbag monomer is inflated, the water level in the hole rises briefly and slowly falls back to stabilize, and the preset pressure is reached in the airbag monomer, and then the next airbag monomer is inflated; when a structure in which an airbag monomer includes multiple sub-airbags is used, each sub-airbag is also inflated from bottom to top in the inflation process. After each sub-airbag is inflated, the water level in the hole rises briefly and slowly falls back to stabilize, and the preset pressure is reached in the sub-airbag, and then the next sub-airbag is inflated.

[0053] Step S103, stop inflation, start the injection process and maintain the set injection pressure. Specifically, when the airbag body adopts a single structure, the repair agent is injected in layers at a fixed depth by injectors at different heights; when the airbag body adopts multiple single structures connected in series, the repair agent is injected into the contaminated soil layer at different depths by injectors set on different single structures; when the airbag body adopts a single structure including multiple sub-airbags, the repair agent is injected into the contaminated soil layer at different depths by injectors set on different sub-airbag structures, and the agent injection on each sub-airbag can be independently controlled.

[0054] Step S104, the agent passes through the airbag body through the injection pipeline into the injector, and then enters the contaminated soil layer through the injection hole; during the injection process, when the pressure near the injector increases and causes the airbag to be squeezed, it is re-inflated to ensure that the airbag is always close to the wall of the hole to prevent the agent from flowing to other soil layer depths.

[0055] Combine the following Figure 2 The implementation method of the device is described as follows through two application examples:

[0056] Example 1

[0057] Application of pollution treatment at different depths in the saturated zone: e.g. Figure 4As shown, the saturated zone is also called the saturated zone, which is located below the groundwater surface. The first airbag 1-1, the second airbag 1-2, and the third airbag 1-3 are placed at different pollution depths in the saturated zone, respectively. The valve is opened, and the air pump first inflates the third airbag 1-3 through the inflation pipeline. The third airbag 1-3 gradually expands, and the groundwater around it is discharged. The water level in the hole rises briefly and then slowly falls back to stabilize. After the third airbag 1-3 reaches the preset pressure, the inflation pipeline of the third airbag 1-3 is closed; the inflation pipeline of the second airbag 1-2 is opened, and the air pump inflates the second airbag 1-2 through the inflation pipeline. The second airbag 1-2 gradually expands, and the groundwater around it is discharged. The water level in the hole rises briefly and then slowly falls back to stabilize, reaching the preset pressure. After the pressure is reached, the inflation pipeline of the second airbag 1-2 is closed; the inflation pipeline of the first airbag 1-1 is opened, and the inflation pump inflates the first airbag 1-1 through the inflation pipeline. The first airbag 1-1 gradually expands, and the groundwater around it is discharged. The water level in the hole rises briefly and then slowly falls back to stabilize. After reaching the preset pressure, the inflation pipeline of the first airbag 1-1 is closed, and the inflation pump stops working; the injection pump is started to maintain the set injection pressure. The medicine passes through the first airbag 1-1, the second airbag 1-2, and the third airbag 1-3 through the injection pipe and enters the injector on each airbag, and then enters the contaminated aquifer in the saturated zone through the injection hole. The medicine diffuses with the groundwater to achieve the purpose of repair. In this saturated zone embodiment, the inflation order of the airbags is the third airbag-the second airbag-the first airbag. Otherwise, the water in the inflation process may not be discharged in time, and a higher inflation pressure is required to make the airbag close to the inner wall of the hole. In this case, the airbag also has the risk of rupture.

[0058] Example 2

[0059] Simultaneous repair of pollution treatment at different depths in the aeration zone and saturated zone Applications: Figure 5As shown, the aeration zone refers to the unsaturated zone from the surface to the phreatic level, that is, the part above the groundwater level. The second airbag 1-2 and the third airbag 1-3 are placed at different pollution depths in the saturated zone, respectively, and the first airbag 1-1 is placed in the aeration zone above the groundwater level. The valve is opened, and the air pump first inflates the third airbag 1-3 through the inflation pipeline. The third airbag 1-3 gradually expands, and the groundwater around it is displaced. After the water level in the hole rises briefly, it will slowly fall back and stabilize. After the third airbag 1-3 reaches the preset pressure, the inflation pipeline of the third airbag 1-3 is closed; the inflation pipeline of the second airbag 1-2 is opened, and the air pump inflates the second airbag 1-2 through the inflation pipeline. The second airbag 1-2 gradually expands, and the groundwater around it is displaced. After the water level in the hole rises briefly, it will slowly fall back and stabilize. After reaching the preset pressure, the inflation pipeline of the second airbag 1-2 is closed; The inflation pipeline of the first airbag 1-1 is opened, and the inflation pump inflates the first airbag 1-1 through the inflation pipeline. The first airbag 1-1 gradually expands, and the groundwater around it is discharged. The water level in the hole rises briefly and then slowly falls back to stabilize. After reaching the preset pressure, the inflation pipeline of the first airbag 1-1 is closed, and the inflation pump stops working; the injection pump is started to maintain the set injection pressure, and the medicine passes through the first airbag 1-1, the second airbag 1-2, and the third airbag 1-3 through the injection pipeline to enter the injector on each airbag, and then enters the contaminated strata in the aeration zone and the saturated zone through the injection hole to achieve the purpose of repair. In this embodiment with both the aeration zone and the saturated zone, the inflation order of the airbags is preferably the aforementioned "third airbag-second airbag-first airbag", or it can be "first airbag-third airbag-second airbag", and it only needs to ensure that the second airbag is inflated after the third airbag.

[0060] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A soil and groundwater remediation agent injection device, characterized in that: The device is arranged in a hole of an excavated soil layer, and comprises a flexible air bag, and the flexible air bag further comprises: The airbag body has hard materials at the upper and lower ends and a flexible material at the wall; a pipeline is sealed between the upper and lower ends and passes through the pipeline, which is used to accommodate the injection pipeline, the inflation pipeline and the air pressure monitoring circuit; An injector, which is arranged outside the flexible wall of the airbag body and connected to the injection pipeline; the injector is arc-shaped or ring-shaped as a whole, the inner side of the injector is in contact with the flexible wall, and the outer side is evenly provided with drug injection holes; After the airbag body is inflated and during the injection of the agent, the injector is against the height of the soil layer to be repaired and the flexible wall surface is in close contact with the hole wall surface.

2. The soil and groundwater remediation agent injection device according to claim 1, characterized in that: The airbag body is a single body structure, and the injectors are arranged at different heights for the fixed-depth and layered injection of the repair agent.

3. The soil and groundwater remediation agent injection device according to claim 1, characterized in that: The airbag body is composed of a plurality of monomer structures connected in series through the pipeline, and the injector is arranged in the middle of each monomer structure, and is used to repair the situation where different use depths of the medicine are far apart.

4. The soil and groundwater remediation agent injection device according to claim 1, characterized in that: The airbag body is a single body structure including a plurality of sub-airbags, and adjacent sub-airbags share end faces of hard material. The injector is arranged in the middle of each sub-airbag or at the end faces of adjacent sub-airbags, and is used to repair situations where the different usage depths of the repair agent are far apart and the injection of the agent needs to be independently controlled at different depths.

5. The soil and groundwater remediation agent injection device according to claim 1, characterized in that: The upstream of the drug injection pipeline is sequentially connected to a medicine tank, a drug injection pump and a first pressure gauge.

6. The soil and groundwater remediation agent injection device according to claim 1, characterized in that: An air pump and a valve are arranged in sequence upstream of the air charging pipeline.

7. The soil and groundwater remediation agent injection device according to claim 1, characterized in that: The air pressure monitoring circuit is provided with a pressure sensor located in the airbag body and a second pressure gauge for measuring air pressure.

8. The soil and groundwater remediation agent injection device according to claim 1, characterized in that: The injector is connected with the drug injection pipeline through a branch pipe; the injection hole on the injector is a one-way hole.

9. The soil and groundwater remediation agent injection device according to claim 1, characterized in that: The device is suitable for the chemical restoration of the aeration zone and saturated zone of the soil.

10. A method for injecting a soil and groundwater remediation agent, characterized in that: Using the device as claimed in any one of claims 1 to 9, comprising the following steps: A. Place the uninflated airbag body into the hole in the excavated soil layer at the depth to be repaired; B. Inflate the airbag body through the inflation pipeline to expand the airbag and reach the preset pressure. At this time, the injector is against the height of the soil layer to be repaired and the flexible wall of the airbag body is close to the wall of the hole; C. Stop inflation, start the injection process and maintain the set injection pressure; D. The agent passes through the airbag body through the injection pipeline and enters the injector, and then enters the contaminated soil layer through the injection hole. During the injection process, when the pressure near the injector increases and causes the airbag to be squeezed, it is re-inflated to ensure that the airbag is always close to the wall of the hole to prevent the agent from flowing to other soil layer depths.

11. The method for injecting a soil and groundwater remediation agent according to claim 10, characterized in that: When the airbag body adopts a single body structure, the repair agent is injected in layers at a fixed depth by injectors at different heights.

12. The method for injecting a soil and groundwater remediation agent according to claim 10, characterized in that: When the airbag body adopts a plurality of monomer structures connected in series, the repair agent is injected into the contaminated soil layer at different depths by injectors arranged on different monomer structures.

13. The method for injecting a soil and groundwater remediation agent according to claim 12, characterized in that: Each airbag monomer is inflated from bottom to top in sequence during the inflation process. After each airbag monomer is inflated, the water level in the hole rises briefly and slowly falls back to stabilize, and the preset pressure is reached in the airbag monomer before the next airbag monomer is inflated.

14. The method for injecting a soil and groundwater remediation agent according to claim 10, characterized in that: When the airbag body adopts a single structure including a plurality of sub-airbags, the repair agent is injected into the contaminated soil layer at different depths by injectors arranged on different sub-airbag structures, and the agent injection on each sub-airbag can be independently controlled.

15. The method for injecting a soil and groundwater remediation agent according to claim 14, characterized in that: Each sub-airbag is inflated from bottom to top in sequence during the inflation process. After each sub-airbag is inflated, the water level in the hole rises briefly and slowly falls back to stabilize, and the preset pressure is reached in the sub-airbag before the next sub-airbag is inflated.

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