Electro-osmosis-micp combined foundation pit water stop reinforcement device and foundation pit water stop method

Abstract

An electroosmotic-MICP combined foundation pit water-stopping and reinforcement device and method are disclosed, relating to the field of foundation pit construction. The electroosmotic-MICP combined foundation pit water-stopping and reinforcement device includes a storage tank, at least two water pumps, and at least one probe. The probe includes an inner cylinder, an outer cylinder sleeved on the inner cylinder, and at least two sets of electrodes. Each set of electrodes is spaced apart along the axial direction of the outer cylinder. The top of the inner cylinder has an injection hole. The outer cylinder has a pumping chamber and an outlet hole communicating with the pumping chamber. The outer cylinder has an outlet chamber corresponding to each set of electrodes. The outer wall of the outer cylinder has multiple outlet holes communicating with the outlet chambers. The outer wall of the inner cylinder has a connecting port communicating with each outlet chamber. An expandable / contractable air bladder is provided within each outlet chamber. The outer wall of the outer cylinder has multiple pumping holes communicating with the pumping chamber. One water pump is connected to both the injection hole and the storage tank, and another water pump is connected to the outlet hole. The electroosmotic-MICP combined foundation pit water-stopping and reinforcement device and method can be used for water-stopping and reinforcement of foundation pits in low-permeability soil.

Description

Technical Field

[0001] This application relates to the field of foundation pit construction, and more specifically, to an electroosmotic-MICP combined foundation pit water-stopping and reinforcement device and a foundation pit water-stopping method. Background Technology

[0002] To fully utilize land space, current construction trends are increasingly focused on high-rise and underground structures, resulting in foundation pits that are often deep, large, and complex. This places higher demands on the seepage prevention and support of these pits. Currently, foundation pits are commonly supported using methods such as pile walls, diaphragm walls, cement-soil retaining walls, and soil nailing walls. When necessary, wellpoint drainage and cutoff walls are used for dewatering and seepage prevention. The application of large amounts of cement slurry and other chemical substances, along with the complex construction process, leads to high costs and significant pollution during foundation pit support.

[0003] Microbial-induced calcium carbonate deposition (MICP) technology involves injecting a microbial culture solution into the soil. During the metabolism of the microorganisms, they produce urease, which decomposes urea. After the urea is decomposed, carbonate ions and ammonium ions are produced. Among them, carbonate ions and calcium ions combine to form calcium carbonate, which fills the pores of the soil, thereby improving the mechanical properties of the soil and reducing the soil permeability coefficient.

[0004] However, the current MIP technology has two limitations: First, it is difficult to apply to soft soil treatment because the small size of soft soil particles results in a low permeability coefficient, making it difficult for microbial culture solutions to migrate in soft soil; Second, it may cause soil pollution because the MIP technology process generates ammonium chloride as a byproduct, which can lead to soil pollution. Summary of the Invention

[0005] The purpose of this application is to provide an electroosmotic-MICP combined foundation pit water-stopping and reinforcement device and a foundation pit water-stopping method, which can achieve water-stopping and reinforcement treatment of low-permeability soil foundation pits without pollution, and effectively improve the stability of the foundation pit.

[0006] This application is implemented as follows:

[0007] This application provides an electroosmotic-MICP combined foundation pit water-stopping and reinforcement device, which includes a liquid storage tank, at least two water pumps, and at least one probe rod. The probe rod includes an inner cylinder, an outer cylinder fixedly sleeved on the outer wall of the inner cylinder, and at least two sets of electrodes fixed on the outer wall of the outer cylinder. Each set of electrodes is arranged at intervals along the axial direction of the outer cylinder. The top of the inner cylinder is provided with an injection hole extending along its axial direction. The outer cylinder is provided with a pumping chamber. The top of the outer cylinder is provided with a water outlet hole communicating with the pumping chamber. The outer cylinder is provided with a liquid outlet chamber corresponding to each set of electrodes. The outer wall of the outer cylinder is provided with multiple liquid outlet holes communicating with the liquid outlet chambers. The outer wall of the inner cylinder is provided with a connecting port communicating with each liquid outlet chamber. Each liquid outlet chamber is provided with an expandable and contractible air bladder to cut off or connect it. The air bladder is connected to an air tube. The outer wall of the outer cylinder is provided with multiple pumping holes communicating with the pumping chamber. At least one water pump is connected to an injection hole and a liquid storage tank respectively, and at least one water pump is connected to a water outlet hole.

[0008] In some alternative embodiments, at least one first permeable stone is provided inside the outer cylinder, the first permeable stone being located between the liquid outlet chamber and the liquid outlet hole.

[0009] In some alternative embodiments, at least one second permeable stone is provided inside the outer cylinder, the second permeable stone being located between the pumping chamber and the pumping hole.

[0010] In some alternative implementations, the outer wall of the outer cylinder is connected with insulating rubber corresponding to each electrode, and the electrodes are embedded in the surface of the insulating rubber.

[0011] In some alternative implementations, each group of electrodes is arranged at circumferential intervals along the outer cylinder.

[0012] In some alternative implementations, a flow rate sensor is provided between the water pump and the storage tank.

[0013] In some alternative implementations, the top of the inner cylinder is provided with an inner cylinder top cover for opening and closing the injection hole.

[0014] In some alternative implementations, the top of the outer cylinder is provided with an outer cylinder top cover for opening and closing the water outlet.

[0015] In some alternative implementations, at least one photovoltaic panel is also included, with the positive and negative electrodes of the photovoltaic panel electrically connected to two sets of electrodes, respectively.

[0016] This application also provides a method for sealing foundation pits, which uses the aforementioned electroosmosis-MICP combined foundation pit sealing and reinforcement device, and includes the following steps:

[0017] Step 1: Insert multiple probes at intervals into both sides of the pre-set excavation area of ​​the foundation pit;

[0018] Step 2: Connect the power supply to the electrodes of each probe rod, and alternately connect the positive and negative terminals of the power supply to the corresponding electrodes of the probe rods set in sequence. Inflate the corresponding air bladder through the air tube, so that the air bladder in the probe rod connected to the negative terminal of the power supply expands and seals the corresponding liquid outlet chamber. Use a water pump to pass the microbial culture medium in the storage tank into the liquid injection hole in the probe rod connected to the positive terminal of the power supply.

[0019] Step 3: Use a water pump to extract water from the outlet holes of each probe until the soil strength on both sides of the pre-set excavation area of ​​the foundation pit reaches the standard, then pull out the probes and seal the boreholes.

[0020] The beneficial effects of this application are as follows: The electroosmotic-MICP combined foundation pit water-stopping reinforcement device provided by this application includes a liquid storage tank, at least two water pumps and at least one probe rod; the probe rod includes an inner cylinder, an outer cylinder fixedly sleeved on the outer wall of the inner cylinder and at least two sets of electrodes fixed on the outer wall of the outer cylinder, each set of electrodes is arranged at intervals along the axial direction of the outer cylinder, the top of the inner cylinder is provided with an injection hole extending along its axial direction, the outer cylinder is provided with a pumping chamber, the top of the outer cylinder is provided with an outlet hole communicating with the pumping chamber, the outer cylinder is provided with an outlet chamber corresponding to each set of electrodes, the outer wall of the outer cylinder is provided with multiple outlet holes communicating with the outlet chambers, the outer wall of the inner cylinder is provided with a connecting port communicating with each outlet chamber, each outlet chamber is provided with an expandable and contractible airbag to cut off or connect it, the airbag is connected to an air tube, the outer wall of the outer cylinder is provided with multiple pumping holes communicating with the pumping chamber; at least one water pump is connected to an injection hole and a liquid storage tank respectively, and at least one water pump is connected to an outlet hole. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device and foundation pit water-stopping method provided in this application can achieve water-stopping and reinforcement treatment of low-permeability soil foundation pits without pollution, and effectively improve the stability of the foundation pit. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a partial cross-sectional structural schematic diagram of the electroosmosis-MICP combined foundation pit water-stopping and reinforcement device provided in Embodiment 1 of this application;

[0023] Figure 2 This is a structural schematic diagram of the electroosmosis-MICP combined foundation pit water-stopping and reinforcement device provided in Embodiment 1 of this application from one perspective.

[0024] Figure 3 This is a schematic diagram of the structure of the electro-osmosis-MICP combined foundation pit water-stopping and reinforcement device provided in Embodiment 1 of this application when it is driven into the soil layer for soil treatment.

[0025] Figure 4 This is a schematic diagram of the structure of the foundation pit water-stopping method provided in Embodiment 2 of this application, which uses an electro-osmosis-MICP combined foundation pit water-stopping and reinforcement device to treat the soil layer in the excavation area of ​​the foundation pit.

[0026] Figure 5 This is a schematic diagram of the structure of the foundation pit water-stopping method provided in Embodiment 2 of this application, which uses an electro-osmosis-MICP combined foundation pit water-stopping and reinforcement device to treat the soil layer outside the foundation pit.

[0027] Figure 6 This is a schematic diagram of the structure when two adjacent electroosmotic-MICP combined foundation pit water-stopping and reinforcement devices are driven into the soil layer for soil treatment in the foundation pit water-stopping method provided in Embodiment 2 of this application.

[0028] In the diagram: 100, storage tank; 110, pressure pump; 120, water pump; 130, flow sensor; 140, cable; 150, cable outlet; 160, water inlet pipe; 170, water outlet pipe; 200, probe; 210, inner cylinder; 220, outer cylinder; 230, electrode; 240, injection hole; 250, pumping chamber; 260, water outlet; 270, liquid outlet chamber; 280, liquid outlet. 290. Connecting port; 300. Airbag; 310. Air pipe; 320. Pumping hole; 330. First permeable stone; 340. Second permeable stone; 350. Insulating rubber; 360. Inner cylinder top cover; 370. Outer cylinder top cover; 380. Photovoltaic panel; 390. Third permeable stone; 400. Pre-set excavation area of ​​foundation pit; 410. Groundwater migration path; 420. Microbial culture medium migration path. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The following describes in further detail the features and performance of the electroosmotic-MICP combined foundation pit water-stopping and reinforcement device and foundation pit water-stopping method of this application with reference to the embodiments.

[0037] Example 1

[0038] like Figure 1 , Figure 2 and Figure 3As shown, this application provides an electroosmosis-MICP combined foundation pit water-stopping and reinforcement device, which includes a liquid storage tank 100, a pressure pump 110 and a water pump 120, a set of probes 200 and a photovoltaic panel 380.

[0039] The probe 200 includes an inner cylinder 210, an outer cylinder 220 fixedly sleeved on the outer wall of the inner cylinder 210, and four sets of electrodes 230 fixed on the outer wall of the outer cylinder 220. The bottom of the outer cylinder 220 is conical. The four sets of electrodes 230 are arranged at intervals along the axial direction of the outer cylinder 220. Each set of electrodes 230 is arranged at intervals along the circumference of the outer cylinder 220. The outer wall of the outer cylinder 220 is connected with insulating rubber 350 corresponding to each electrode 230. Each electrode 230 is embedded and connected to the surface of the corresponding insulating rubber 350. The top of the inner cylinder 210 is provided with a liquid injection hole 240 extending along its axial direction. The outer cylinder 220 is provided with a water pumping chamber 250. The top of the outer cylinder 220 is provided with a water outlet hole 260 communicating with the water pumping chamber 250. The outer cylinder 220 is provided with four liquid outlet chambers 270 corresponding to each set of electrodes 230. Each liquid outlet chamber 270 is located at the bottom of the corresponding set of electrodes 230. The electrodes 230 are graphite electrodes. Pressure pump 110 is connected to injection port 240 through inlet pipe 160, and water pump 120 is connected to outlet port 260 through outlet pipe 170.

[0040] The outer wall of the outer cylinder 220 has four sets of liquid outlet holes 280 corresponding to each liquid outlet chamber 270. Each set of liquid outlet holes 280 is arranged circumferentially around the outer cylinder 220 and connects to the corresponding liquid outlet chamber 270. The outer wall of the inner cylinder 210 is provided with a connecting port 290 connecting each liquid outlet chamber 270. Each liquid outlet chamber 270 is provided with an expandable air bladder 300 that can cut off or connect to it. The air bladder 300 is connected to an air pipe that extends out of the inner cylinder 210 through the injection hole 240. 310. The outer wall of the outer cylinder 220 is provided with four sets of water extraction holes 320. Each set of water extraction holes 320 is arranged at intervals along the circumference of the outer cylinder 220 and is connected to the water extraction chamber 250. Each set of water extraction holes 320 is located at the top of a set of electrodes 230. The pressure pump 110 is connected to an injection hole 240 and a storage tank 100 respectively. A flow rate sensor 130 is provided between the pressure pump 110 and the storage tank 100. The water pump 120 is connected to the water outlet hole 260 of each probe 200. The outer cylinder 220 is provided with four first permeable stones 330 and four second permeable stones 340. Each first permeable stone 330 is located between the liquid outlet chamber 270 and a set of liquid outlet holes 280. Each second permeable stone 340 is located between the water extraction chamber 250 and a set of water extraction holes 320. The top of the inner cylinder 210 is provided with an inner cylinder top cover 360 for opening and closing the liquid injection hole 240, and the top of the outer cylinder 220 is provided with an outer cylinder top cover 370 for opening and closing the water outlet hole 260. The positive and negative electrodes of the photovoltaic panel 380 are electrically connected to two sets of electrodes 230 through cables 140 respectively. The outer cylinder top cover 370 is provided with an outlet hole 150 that communicates with the pumping chamber 250 for the cable 140 to pass through. A third permeable stone 390 is provided at the connection port 290, and the airbag 300 is located between the corresponding first permeable stone 330 and third permeable stone 390.

[0041] The electroosmotic-MICP combined foundation pit water-stopping and reinforcement device provided in this application embodiment can be used alone to treat soil. In use, the probe 200 is inserted into the soil layer to be treated. The positive and negative electrodes of the photovoltaic panel 380 are electrically connected to each set of electrodes 230 via cables 140. Two adjacent sets of electrodes 230 are also electrically connected to the positive and negative electrodes of the photovoltaic panel 380, respectively. Air is then introduced through the air pipe 310 into the air bladders 300 in the corresponding outlet chambers 270 of the two sets of electrodes 230 electrically connected to the negative electrode of the photovoltaic panel 380, causing the air bladders 300 to inflate. The expansion blocks and seals the liquid outlet chambers 270 corresponding to the two sets of electrodes 230 electrically connected to the negative electrode of the photovoltaic panel 380. Then, the microbial culture solution stored in the storage tank 100 is transported to the injection hole 240 of the inner cylinder 210 via the pressure pump 110 and corresponding pipeline. The microbial culture solution then enters the liquid outlet chambers 270 corresponding to the two sets of electrodes 230 electrically connected to the positive electrode of the photovoltaic panel 380 through the injection hole 240 and the connecting port 290, and further exits through the liquid outlet hole 280 connecting the two corresponding liquid outlet chambers 270, permeating into the soil through the outer wall of the outer cylinder 220. Simultaneously, since the positive and negative electrodes of the photovoltaic panel 380 are electrically connected to each set of electrodes 230, the microbial culture solution that has infiltrated into the soil layer moves from the two sets of electrodes 230 connected to the positive electrode of the photovoltaic panel 380 towards the two sets of electrodes 230 connected to the negative electrode of the photovoltaic panel 380 through electroosmosis. This forms a groundwater transport path 410 and a microbial culture solution transport path 420 in the soil layer, effectively promoting the infiltration and diffusion of the microbial culture solution in the soil layer and improving the soil in the area through which it flows. At the same time, the soil is pumped by the water pump 120 through the corresponding pipeline. The water is drawn out of the ground through the pumping hole 320, the pumping chamber 250 and the outlet hole 260. On the one hand, it promotes the flow and diffusion of the microbial culture solution in the soil. On the other hand, it can extract the ammonium chloride produced by the microbial culture solution in the process of improving the soil to the bottom surface for treatment to reduce pollution. In addition, when the microbial culture solution penetrates and diffuses in the soil through electroosmosis, it can also decompose some of the ammonium chloride at the electrode 230 through electrolysis to form ammonia, chlorine and hydrogen, thereby further reducing the pollution effect of ammonium chloride produced by the microbial culture solution on the soil.

[0042] Specifically, air is introduced into the air bladders 300 within the liquid outlet chambers 270 corresponding to the two sets of electrodes 230 electrically connected to the negative electrode of the photovoltaic panel 380 via the air tube 310. This inflation of the air bladders 300 blocks and seals the liquid outlet chambers 270 corresponding to the two sets of electrodes 230 electrically connected to the negative electrode of the photovoltaic panel 380. This ensures that the microbial culture medium is only delivered to the liquid outlet chambers 270 corresponding to the two sets of electrodes 230 electrically connected to the positive electrode of the photovoltaic panel 380 and then discharged to the two sets of electrodes 230 electrically connected to the positive electrode of the photovoltaic panel 380 via electroosmosis diffusion. The outer cylinder... The outer wall of 220 is connected with insulating rubber 350 corresponding to each electrode 230. Each electrode 230 is embedded in the surface of the corresponding insulating rubber 350, which can ensure that the electrode 230 is stably energized and cooperates to carry out electroosmosis operation. A flow rate sensor 130 is provided between the pressure pump 110 and the storage tank 100. The flow rate sensor 130 can be used to detect the flow rate of the microbial culture medium in the storage tank 100 into the injection hole 240 by the pressure pump 110, so that the operator can adjust the injection volume of the microbial culture medium.

[0043] In addition, the outer cylinder 220 is provided with a first permeable stone 330 located between the liquid outlet chamber 270 and a set of liquid outlet holes 280, and a second permeable stone 340 located between the water pumping chamber 250 and a set of water pumping holes 320. The first permeable stone 330 and the second permeable stone 340 can be used to filter and block the liquid outlet holes 280 and the water pumping holes 320, preventing external mud and sand from entering the liquid outlet chamber 270 and the water pumping chamber 250 through the liquid outlet holes 280 and the water pumping holes 320 and causing blockage and affecting the operation. The outer cylinder 220 is provided with a third permeable stone 390, and the airbag 300 is located between the first permeable stone 330 and the third permeable stone 390. The first permeable stone 330 and the third permeable stone 390 can be used to limit the position of the airbag 300, ensuring that the inflated airbag 300 can stably cut off the liquid outlet chamber 270 when needed.

[0044] Example 2

[0045] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, this application embodiment also provides a method for sealing foundation pits, which is carried out using the electroosmosis-MICP combined foundation pit sealing and reinforcement device provided in several embodiments 1, and includes the following steps:

[0046] Step 1: Geological survey to determine the stratum distribution of the pre-excavation area 400 of the foundation pit, and mark the boundary of the pre-excavation area 400. Insert probes 200 at intervals 1-3m from the boundary inside the pre-excavation area 400 of the foundation pit. When inserting the probes 200 into the stratum, conventional static penetration testing equipment combined with a borehole device can be used to drive the probes 200 into the hard stratum.

[0047] Step 2: Connect the photovoltaic panel 380 to the electrodes 230 of each probe rod 200 in sequence, so that the positive and negative electrodes of the photovoltaic panel 380 are alternately connected to the corresponding electrodes 230 of the probe rods 200. Inflate the corresponding air bladder 300 through the air tube 310, so that the air bladder 300 in the probe rod 200 connected to the negative electrode of the photovoltaic panel 380 expands and seals the corresponding liquid outlet chamber 270. Use the pressure pump 110 to pass the microbial culture medium in the storage tank 100 into the liquid injection hole 240 in the probe rod 200 connected to the positive electrode of the power supply.

[0048] Step 3: Use water pump 120 to draw water from the outlet holes 260 of each probe 200, and use flow rate sensor 130 to check the flow rate of the microbial culture medium in the storage tank 100 into the injection hole 240 through the pressure pump 110, and control the pressure pump 110 to adjust the injection volume of the microbial culture medium.

[0049] Step 4: Measure the soil strength of the pre-excavation area 400 of the foundation pit through in-situ exploration. When the soil strength of the pre-excavation area 400 of the foundation pit reaches the expected target standard, turn off the pressure pump 110 and water pump 120, pull out the probe 200 to seal the borehole, and complete the reinforcement of the passive zone soil inside the boundary of the pre-excavation area 400 of the foundation pit.

[0050] Step 5: Insert probe rods 200 at intervals along the boundary of the pre-excavation area 400 of the foundation pit, 1-3m away from the boundary. Repeat steps 2 and 3 until the water pumping volume of the outlet hole 260 of the probe rod 200 is significantly reduced. Pull out the probe rod 200 and seal the borehole to complete the construction of the waterstop outside the boundary of the pre-excavation area 400 of the foundation pit.

[0051] Step 6: Drive support piles into the outer boundary of the pre-excavation area of ​​the foundation pit (400 mm).

[0052] Step 7: Excavate the pre-designated excavation area of ​​the foundation pit.

[0053] The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device and foundation pit water-stopping method provided in this application realize the application of MICP technology in low-permeability soil by combining electroosmosis and MICP technology. It can be applied to the treatment of foundation pits of any soil type, and can be combined with photovoltaic power generation technology to perform water-stopping and reinforcement treatment of foundation pits under the premise of green and environmental protection, thereby improving the stability of foundation pit projects and reducing pollution generated during foundation pit support.

[0054] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A combined electroosmosis-MICP foundation pit water-stopping and reinforcement device, characterized in that, It includes a storage tank, at least two water pumps, and at least one probe. The probe includes an inner cylinder, an outer cylinder fixedly sleeved on the outer wall of the inner cylinder, and at least two sets of electrodes fixed to the outer wall of the outer cylinder. Each set of electrodes is spaced apart along the axial direction of the outer cylinder. The top of the inner cylinder has an injection hole extending along its axial direction. The outer cylinder has a pumping chamber. The top of the outer cylinder has an outlet hole communicating with the pumping chamber. The outer cylinder has an outlet chamber corresponding to each set of electrodes. The outer wall of the outer cylinder has multiple outlet holes communicating with the outlet chambers. The outer wall of the inner cylinder has a connecting port communicating with each outlet chamber. Each outlet chamber has an expandable air bladder that can cut off or connect to it. The air bladder is connected to an air tube. The outer wall of the outer cylinder has multiple pumping holes communicating with the pumping chamber. At least one water pump is connected to an injection hole and the storage tank, and at least one water pump is connected to the outlet hole.

2. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device according to claim 1, characterized in that, The outer cylinder is provided with at least one first permeable stone, which is located between the liquid outlet cavity and the liquid outlet hole.

3. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device according to claim 1, characterized in that, The outer cylinder is provided with at least one second permeable stone, which is located between the pumping chamber and the pumping hole.

4. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device according to claim 1, characterized in that, The outer wall of the outer cylinder is connected to insulating rubber corresponding to each of the electrodes, and the electrodes are embedded in the surface of the insulating rubber.

5. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device according to claim 1, characterized in that, Each group of electrodes is arranged at circumferential intervals along the outer cylinder.

6. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device according to claim 1, characterized in that, A flow rate sensor is installed between the water pump and the liquid storage tank.

7. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device according to claim 1, characterized in that, The top of the inner cylinder is provided with an inner cylinder top cover for opening and closing the injection hole.

8. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device according to claim 1, characterized in that, The top of the outer cylinder is provided with an outer cylinder top cover for opening and closing the water outlet.

9. The electroosmosis-MICP combined foundation pit water-stopping and reinforcement device according to claim 1, characterized in that, It also includes at least one photovoltaic panel, the positive and negative electrodes of which are electrically connected to the two sets of electrodes, respectively.

10. A method for sealing water in a foundation pit, characterized in that, It is carried out using the electroosmosis-MICP combined foundation pit water-stopping and reinforcement device as described in any one of claims 1 to 9, and includes the following steps: Step 1: Insert multiple probes at intervals into both sides of the pre-set excavation area of ​​the foundation pit; Step 2: Connect the power supply to the electrodes of each probe rod, and alternately connect the positive and negative terminals of the power supply to the corresponding electrodes of the probe rods arranged in sequence. Inflate the corresponding air bladder through the air tube, so that the air bladder in the probe rod connected to the negative terminal of the power supply expands and seals the corresponding liquid outlet chamber. Use a water pump to pass the microbial culture medium in the storage tank into the liquid injection hole in the probe rod connected to the positive terminal of the power supply. Step 3: Use a water pump to extract water from the outlet holes of each probe until the soil strength on both sides of the pre-set excavation area of ​​the foundation pit reaches the standard, then pull out the probe and seal the borehole.

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