Device and method for karst soil cave foundation multifunctional early warning and continuous plugging

Abstract

A device and method for karst soil cave foundation multifunctional early warning and continuous plugging, the device comprises a urease storage tank, a urea storage tank, a precipitation platform, a liquid delivery pipe, a foundation soil treatment area is arranged in the karst soil, a tower is installed in the foundation soil treatment area through a tower foundation, the urease storage tank and the urea storage tank are installed on the upper side of the foundation soil treatment area, the precipitation platform is connected with the urea storage tank through a liquid guide pipe, the precipitation platform is located on the upper side of the foundation soil treatment area, a side groove is formed in the periphery of the bottom of the foundation soil treatment area, a plurality of storage tanks are installed in the side groove, a heat-sensitive sensor is installed on the upper side of the storage tank, calcium oxide particles are filled in the storage tank, the liquid delivery pipe is installed in the foundation soil treatment area and is connected with the urease storage tank at both ends, the outer peripheral surface of the liquid delivery pipe is sequentially connected with side claws from high to low, and liquid injection holes are formed in the side claws. The present application can not only improve the stability of the tower, but also has good plugging effect and can inhibit the development of soil caves.

Description

Technical Field

[0001] The present invention relates to the technical field of pole tower protection, and in particular to a device and method for multifunctional early warning and continuous blocking of karst soil cave foundations. Background Art

[0002] With the widespread use of transmission towers in karst geological conditions, dissolved carbon dioxide in water forms carbonic acid, which reacts with calcium carbonate in the rock to produce soluble calcium carbonate. This reaction causes the rock surface to dissolve, forming caverns. These caverns have a strong tendency to expand, destroying the original soil skeleton structure and causing the tower foundation to sink, deform, or even overturn. This can lead to serious line operation problems and huge economic losses. Therefore, the safety and stability of transmission towers in karst soil caverns must be given great attention. Because karst soil caverns are natural cavities formed by dissolution, their geological characteristics require higher load-bearing and stability requirements for transmission towers. However, the commonly used transmission tower stabilization methods cannot effectively suppress the expansion of karst soil caverns while maintaining tower stability. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects and problems of poor tower stability in the prior art and to provide a device and method with higher stability for multifunctional early warning and continuous blocking of karst soil cave foundations.

[0004] In order to achieve the above purpose, the technical solution of the present invention is: a device for multifunctional early warning and continuous blocking of karst soil cave foundation, comprising a urease storage tank, a urea storage tank, a precipitation platform, and a liquid infusion pipe. A foundation soil treatment area is provided in the karst soil body, and the tower is installed in the foundation soil treatment area through the tower foundation. The urease storage tank and the urea storage tank are respectively installed on the upper side of the foundation soil treatment area and arranged relative to the outer circle of the tower legs. The precipitation platform is connected to the urea storage tank through a liquid guide pipe. The precipitation platform is located on the upper side of the foundation soil treatment area. The bottom of the foundation soil treatment area is provided with side grooves along the circumference. Multiple storage boxes are installed in the side grooves. The upper sides of the multiple storage boxes are provided with thermal sensors. The storage boxes are filled with calcium oxide particles. The infusion pipe is U-shaped and is installed in the foundation soil treatment area. Both ends of the infusion pipe are connected to the urease storage tank. The outer peripheral surface of the infusion pipe is connected with side claws in sequence from high to low, and the side claws are provided with spray holes.

[0005] The storage box includes a waterproof shell, cardboard, and a hot-melt plastic shell. An opening is provided on the lower side of the waterproof shell, and a baffle is inserted into the opening of the waterproof shell. The hot-melt plastic shell abuts the inner wall of the waterproof shell and has an opening on the lower side. The cardboard is connected to the opening of the hot-melt plastic shell and its lower side abuts the upper side of the baffle. The inner side wall of the hot-melt plastic shell is sequentially connected with a plurality of arched steel plates at intervals along the vertical direction. Calcium oxide particles are filled between the arched steel plate located at the bottom layer and the cardboard, and calcium oxide particles are filled between two adjacent arched steel plates.

[0006] The infusion tube includes an inner tube and an outer tube arranged coaxially, a support frame is provided between the inner tube and the outer tube, a support frame is provided inside the inner tube, both ends of the inner tube are connected to the urease storage tank, the side claws pass through the outer tube and are connected to the inner tube, the bottom of the outer tube is connected to the sand and gravel cushion layer of the karst soil through a notch, and the outer tube is filled with sand.

[0007] A notch is formed at the bottom of the inner tube, a first baffle is rotatably connected to the notch of the outer tube, and a second baffle is rotatably connected to the notch of the inner tube, and one end of the first baffle and the second baffle are connected to a power device;

[0008] The power device is used to control the sealing and opening of the outer tube and the inner tube by controlling the rotation of the first baffle plate and the second baffle plate.

[0009] A pressure pump is installed on the urease storage tank, and a water filter is provided at the notch of the inner tube. The water filter is located on the upper side of the second baffle plate.

[0010] One-way valves are arranged in each of the side claws, and the lengths of the side claws decrease in sequence from high to low.

[0011] A method for multifunctional early warning and continuous blocking of karst soil cave foundations, the method being applied to a device for multifunctional early warning and continuous blocking of karst soil cave foundations, the method comprising the following steps:

[0012] Step 1: After the tower foundation soil is excavated, lay the sand and gravel cushion layer;

[0013] Step 2: After the paving is completed, the initial soil replacement treatment is carried out, and the soil area near the tower legs is defined as the foundation soil treatment area;

[0014] Step 3: dig side trenches around the bottom of the foundation soil treatment area, place the storage box and thermal sensor, and fill the storage box with calcium oxide particles;

[0015] Step 4: pre-buried the infusion pipe in the foundation soil treatment area, installed multiple side claws at intervals along the vertical direction on the outside of the infusion pipe, connected the two ends of the inner pipe to the urease storage tank, and set a precipitation platform on the outer ring of the tower;

[0016] Step 5: When soil holes develop around the foundation soil treatment area, water seeps from the bottom of the storage box, and the calcium oxide particles inside the storage box react with water to release heat, stimulating the thermal sensor to alarm;

[0017] Step 6: Spray the pre-mixed urea solution through the precipitation platform according to the alarm information;

[0018] Step 7: When the urea solution has successfully infiltrated into the soil at different levels, the urease storage tank is opened, the urease solution is controlled to flow through the infusion tube and delivered to the soil at different levels through the side claws;

[0019] Step 8: Repeat steps 6 and 7, and determine the degree of solidification of the urea solution and urease solution combined with the calcium ion reaction. When the solidification degree is the same as the set solidification degree, stop spraying the urea solution and stop delivering the urease solution, and the karst soil cave foundation is sealed.

[0020] The specific steps of judging the degree of solidification of the urea solution and the urease solution combined with the calcium ion reaction in step eight are as follows:

[0021] The first and second baffles of the infusion tube are closed by controlling the power equipment, and two openings are respectively drawn out from the upper part of the outer tube. Air pressure is injected into one of the openings, and the air pressure of the second opening is tested. If the difference between the injected air pressure and the tested air pressure of the opening is not greater than the set threshold, it indicates that the degree of solidification is the same as the set degree of solidification.

[0022] After pre-burying the infusion pipe, sand is poured into the outer tube of the infusion pipe. When soil holes appear around the foundation soil treatment area, the degree of soil hole development is judged by observing the height of sand in the outer tube in real time and sand is added to the outer tube. After adding, the filling effect of the sand is judged.

[0023] The first barrier plate of the infusion tube is opened and the second barrier plate is closed by controlling the power equipment. Two openings are respectively led out from the upper part of the outer tube. Air pressure is injected into one of the openings, and the air pressure of the other opening is tested. If the air pressure of one of the openings is obviously unable to be injected or the detected air pressure of the other opening is very small, it indicates that the sand filling effect is good.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides a multifunctional early warning and continuous sealing device and method for karst soil cave foundations. Water seepage, which occurs after soil cave development, triggers an exothermic reaction between water and calcium oxide, thereby detecting the location of the soil cave development. A thermal sensor provides an early warning. Simultaneously, calcium oxide, as a substance already present in the soil cave, undergoes an exothermic chemical reaction, creating a thermal environment that inhibits the erosion of calcium carbonate rock and promotes the decomposition of calcium bicarbonate. A novel microbial induction technology is employed to allow urease and urea solutions to react within the soil, effectively sealing the soil's existing pores and improving its bearing capacity and shear resistance. This method also isolates the corrosion path between the tower foundation and the soil cave, thereby inhibiting the development of soil caves. Therefore, the present invention can improve the stability of the tower and inhibit the development of soil caves.

[0026] 2. In the present invention, a multifunctional early warning and continuous sealing device and method for karst soil cave foundations is implemented. After the hot-melt plastic shell in the storage box is melted, the remaining plastic shell, due to its own thermal shrinkage, can still cooperate with the arched steel plate to form a wrap around each layer of calcium oxide particles, fully preparing for the next early warning and sealing of the cave groundwater development. At the same time, the cardboard absorbs water, and even a small amount of groundwater flows normally. The cardboard can absorb and lock in water, avoiding false warnings and activating the device. When there is abundant water, the cardboard's own shrinkage function is insufficient, and it acts as a medium to transfer water into the internal plastic shell, causing a reaction, thereby improving the accuracy of early warnings. Therefore, the present invention has a high reuse rate and high accuracy.

[0027] 3. In the present invention, a multifunctional early warning and continuous sealing device and method for karst soil cave foundations employs an inner and outer infusion tube. The inner tube delivers the urease solution, while the outer tube allows for timely assessment of soil cave development by the height of the sand within the tube, enabling subsequent sustainable filling and remedial measures. The sealing effect is further verified using an air pressure detection method, thereby improving the sealing quality. A pressure pump can be used to extract some groundwater, reducing runoff and rock erosion, thereby inhibiting the development of soil caves. Therefore, the present invention provides a good sealing effect and can inhibit the development of soil caves. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view schematic diagram of a device for multifunctional early warning and continuous blocking of karst soil cave foundations in the present invention.

[0029] Figure 2 It is a top view schematic diagram of a device for multifunctional early warning and continuous blocking of karst soil cave foundations in the present invention.

[0030] Figure 3 It is a structural schematic diagram of the infusion tube and side claws in the present invention.

[0031] Figure 4 It is a partial cross-sectional schematic diagram of the infusion tube in the present invention.

[0032] Figure 5 It is a schematic cross-sectional view of the material storage box in the present invention.

[0033] In the figure: tower 1, tower foundation 2, infusion pipe 3, inner pipe 31, outer pipe 32, support frame 33, first baffle 34, second baffle 35, side claws 4, gravel cushion 5, storage box 6, waterproof shell 61, hot-melt plastic shell 62, cardboard 63, arched steel plate 64, baffle 65, thermal sensor 7, side trough 8, urease storage tank 9, urea storage tank 10, liquid guide pipe 11, precipitation platform 12, pressure pump 13, water filter net 14, foundation soil treatment area 15, karst soil cave 16. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example 1

[0035] See also Figures 1 to 5 A multifunctional early warning and continuous blocking device for karst soil cave foundations includes a urease storage tank 9, a urea storage tank 10, a precipitation platform 12, and a liquid infusion pipe 3. A foundation soil treatment area 15 is provided in the karst soil body. The tower 1 is installed in the foundation soil treatment area 15 through the tower foundation 2. The urease storage tank 9 and the urea storage tank 10 are respectively installed on the upper side of the foundation soil treatment area 15 and arranged relative to the outer circle of the tower leg of the tower 1. The precipitation platform 12 is connected to the urea storage tank 10 through a liquid guide pipe 11. The precipitation platform 12 is located on the upper side of the foundation soil treatment area 15. A side groove 8 is provided at the bottom of the foundation soil treatment area 15 along the circumferential direction, and a plurality of storage boxes 6 are installed in the side groove 8. A thermal sensor 7 is installed on the upper side of the plurality of storage boxes 6. The storage box 6 is filled with calcium oxide particles. The infusion pipe 3 is U-shaped and is installed in the foundation soil treatment area 15. Both ends of the infusion pipe 3 are connected to the urease storage tank 9. The outer peripheral surface of the infusion pipe 3 is connected with side claws 4 in sequence from high to low. A spray hole is provided on the side claws 4. A one-way valve is provided in each of the plurality of side claws 4, and the lengths of the plurality of side claws 4 become shorter from high to low.

[0036] In this embodiment, the precipitation platform 12 can utilize a spray pipe with multiple spray holes. Multiple spray holes are evenly spaced on the side claws 4. When the thermal sensor 7 detects a change in soil temperature and issues an alarm, the one-way valve can be controlled to open for subsequent delivery of the urease solution. The liquid delivery pipe 3 is buried within the foundation soil treatment area 15 according to the calculated influence line. The liquid delivery pipe 3 is welded to the side claws 4 at different levels along the calculated influence line. When the minimum burial depth of the liquid delivery pipe 3 is less than or equal to 6m, the side claws 4 should be densely packed at different heights. As the minimum burial depth of the liquid delivery pipe 3 increases, the number of side claws 4 can be reduced as appropriate. In this embodiment, based on engineering experience and design specifications, the recommended minimum burial depth of the liquid delivery pipe 3 is 14-18m. In accordance with the safety influence line of the soil cave top, the side claws 4 are evenly spaced approximately 1m apart. Example 2

[0037] The basic content is the same as Example 1, except that:

[0038] See also Figure 5 The storage box 6 includes a waterproof shell 61, a cardboard 63, and a hot-melt plastic shell 62. The lower side of the waterproof shell 61 is provided with an opening, and a baffle 65 is inserted at the opening of the waterproof shell 61. The hot-melt plastic shell 62 abuts against the inner wall of the waterproof shell 61 and has an opening on the lower side. The cardboard 63 is connected to the opening of the hot-melt plastic shell 62 and the lower side abuts against the upper side of the baffle 65. The inner side wall of the hot-melt plastic shell 62 is connected with a plurality of arched steel plates 64 in sequence along the vertical direction. Calcium oxide particles are filled between the arched steel plate 64 located at the bottom layer and the cardboard 63, and calcium oxide particles are filled between two adjacent arched steel plates 64.

[0039] In this embodiment, the waterproof shell 61 is made of iron sheet material, and the cardboard 63 allows external water to seep in. The waterproof shell 61 made of iron sheet material cooperates with the internal hot-melt plastic shell 62 to isolate the internal and external environments and prevent external water seepage and oxygen oxidation. After the cardboard 63 absorbs water, the calcium oxide particles in the bottom layer react with water to release heat, and then the hot-melt plastic shell 62 shrinks to the upper layer. When the groundwater in the cave develops to the point where calcium oxide meets water again, the calcium oxide continues to react and release heat, and then the hot-melt plastic shell 62 continues to shrink to the upper layer, thereby achieving repeated reactions and allowing the thermal sensor 7 to continuously alarm. Example 3

[0040] The basic content is the same as Example 1, except that:

[0041] See also Figure 3 and Figure 4The infusion tube 3 includes a coaxially arranged inner tube 31 and outer tube 32. A support frame 33 is provided between the inner tube 31 and the outer tube 32. The support frame 33 is provided inside the inner tube 31. Both ends of the inner tube 31 are connected to the urease storage tank 9. The side claws 4 pass through the outer tube 32 and are connected to the inner tube 31. The bottom of the outer tube 32 is connected to the sand and gravel cushion 5 of the karst soil through a notch. The outer tube 32 is filled with sand. The bottom of the inner tube 31 is provided with a notch. A first baffle plate 34 is rotatably connected to the notch of the outer tube 32. A second baffle plate 35 is rotatably connected to the notch of the inner tube 31. One end of the first baffle plate 34 and the second baffle plate 35 are connected to the power equipment.

[0042] The power device is used to control the sealing and opening of the outer tube 32 and the inner tube 31 by controlling the rotation of the first baffle plate 34 and the second baffle plate 35;

[0043] A pressure pump 13 is installed on the urease storage tank 9 , and a water filter net 14 is provided at the notch of the inner tube 31 . The water filter net 14 is located on the upper side of the second baffle plate 35 .

[0044] In this embodiment, the support frame 33 adopts a lattice structure, which can provide strength so that the infusion tube 3 can be used under complex geological conditions, and can transport sand and gravel particles and various solutions in the tube. The power equipment can use a drive motor and be waterproofed. Example 4

[0045] See also Figure 1 and Figure 2 A method for multifunctional early warning and continuous blocking of karst soil cave foundations according to Example 3 is applied to a device for multifunctional early warning and continuous blocking of karst soil cave foundations, and the method comprises the following steps:

[0046] Step 1: After the foundation soil of the tower 1 is excavated, a sand and gravel cushion layer 5 is laid;

[0047] Step 2: After the paving is completed, the initial soil replacement treatment is carried out, and the soil area near the tower leg of the tower 1 is defined as the foundation soil treatment area 15;

[0048] Step 3: dig side trenches 8 around the bottom of the foundation soil treatment area 15, place the storage box 6 and the thermal sensor 7, and fill the storage box 6 with calcium oxide particles;

[0049] Step 4: pre-buried the infusion pipe 3 in the foundation soil treatment area 15, installed multiple side claws 4 at intervals along the vertical direction on the outside of the infusion pipe 3, and connected the two ends of the inner pipe 31 to the urease storage tank 9, and set a precipitation platform 12 on the outer ring of the tower 1;

[0050] Step 5: When soil holes appear around the foundation soil treatment area 15, water seeps from the bottom of the storage box 6, and the calcium oxide particles inside the storage box 6 react with water to release heat, stimulating the thermal sensor 7 to alarm;

[0051] Step 6: spraying the pre-mixed urea solution through the precipitation platform 12 according to the alarm information;

[0052] Step 7: When the urea solution has successfully infiltrated into the soil at different levels, the urease storage tank 9 is opened, and the urease solution is controlled to flow through the liquid delivery tube 3 and delivered to the soil at different levels through the side claws 4;

[0053] Step 8. Repeat steps 6 and 7, and determine the degree of solidification of the urea solution and urease solution combined with the calcium ion reaction. The first baffle 34 and the second baffle 35 of the infusion tube 3 are closed by the power equipment. Two openings are respectively drawn out from the upper part of the outer tube 32. Air pressure is injected into one of the openings, and the air pressure is detected at the second opening. If the difference between the injected air pressure and the detected air pressure of the opening is not greater than the set threshold value, it indicates that the degree of solidification is the same as the set degree of solidification. When the degree of solidification is the same as the set degree of solidification, stop spraying the urea solution and stop delivering the urease solution, and the karst soil cave foundation is sealed.

[0054] In this embodiment, the difference between the injection pressure and the detection pressure of the opening is the larger value minus the smaller value. The range of the threshold value can be set according to the actual detection environment and with reference to existing data. Example 5

[0055] The basic content is the same as that of Example 4, except that:

[0056] After the infusion pipe 3 is pre-buried, sand is poured into the outer tube 32 of the infusion pipe 3. When soil holes appear around the foundation soil treatment area 15, the degree of soil hole development is judged by observing the height of the sand in the outer tube 32 in real time and sand is added to the outer tube 32. After addition, the first baffle plate 34 of the infusion pipe 3 is controlled to open and the second baffle plate 35 is closed by the power equipment. Two openings are respectively drawn out from the upper part of the outer tube 32, and air pressure is injected into one of the openings, and the air pressure is tested on the other opening. If the air pressure of one of the openings is obviously not injected or the detected air pressure of the other opening is very small, it indicates that the sand filling effect is good.

Claims

1. A multifunctional early warning and continuous blocking device for karst soil cave foundations, characterized by: The invention comprises a urease liquid storage tank (9), a urea liquid storage tank (10), a precipitation platform (12), and a liquid infusion pipe (3); a foundation soil treatment area (15) is provided in the karst soil body; a pole tower (1) is installed in the foundation soil treatment area (15) through a pole tower foundation (2); the urease liquid storage tank (9) and the urea liquid storage tank (10) are respectively installed on the upper side of the foundation soil treatment area (15) and arranged relative to the outer circle of the tower leg of the pole tower (1); the precipitation platform (12) adopts a spray pipe with multiple spray holes; the precipitation platform (12) is connected to the urea liquid storage tank (10) through a liquid guide pipe (11); the precipitation platform (12) is located On the upper side of the foundation soil treatment area (15), a side groove (8) is provided at the bottom of the foundation soil treatment area (15) along the circumferential direction, a plurality of storage boxes (6) are installed in the side groove (8), a thermal sensor (7) is installed on the upper side of the plurality of storage boxes (6), and the storage boxes (6) are filled with calcium oxide particles. The liquid infusion pipe (3) is U-shaped and installed in the foundation soil treatment area (15). Both ends of the liquid infusion pipe (3) are connected to the urease storage tank (9), and the outer peripheral surface of the liquid infusion pipe (3) is connected to side claws (4) in sequence from high to low, and the side claws (4) are provided with spray holes; The storage box (6) includes a waterproof shell (61), a cardboard (63), and a hot-melt plastic shell (62). The lower side of the waterproof shell (61) is provided with an opening, and a baffle (65) is inserted into the opening of the waterproof shell (61). The hot-melt plastic shell (62) abuts against the inner wall of the waterproof shell (61) and has an opening on the lower side. The cardboard (63) is connected to the opening of the hot-melt plastic shell (62) and its lower side abuts against the upper side of the baffle (65). The inner side wall of the hot-melt plastic shell (62) is sequentially connected with a plurality of arched steel plates (64) at intervals in the vertical direction. Calcium oxide particles are filled between the arched steel plate (64) located at the bottom layer and the cardboard (63), and calcium oxide particles are filled between two adjacent arched steel plates (64). The infusion tube (3) comprises an inner tube (31) and an outer tube (32) which are coaxially arranged. A support frame (33) is provided between the inner tube (31) and the outer tube (32). The support frame (33) is provided inside the inner tube (31). Both ends of the inner tube (31) are connected to the urease storage tank (9). The side claws (4) pass through the outer tube (32) and are connected to the inner tube (31). The bottom of the outer tube (32) is connected to the sand and gravel cushion layer (5) of the karst soil body through a notch. The outer tube (32) is filled with sand. A notch is provided at the bottom of the inner tube (31); a first baffle plate (34) is rotatably connected to the notch of the outer tube (32); a second baffle plate (35) is rotatably connected to the notch of the inner tube (31); one end of each of the first baffle plate (34) and the second baffle plate (35) is connected to a power device; The power device is used to control the sealing and opening of the outer tube (32) and the inner tube (31) by controlling the rotation of the first baffle plate (34) and the second baffle plate (35).

2. The multifunctional early warning and continuous blocking device for karst soil cave foundation according to claim 1 is characterized in that: A pressure pump (13) is installed on the urease storage tank (9), and a water filter (14) is provided at the notch of the inner tube (31). The water filter (14) is located on the upper side of the second baffle plate (35).

3. The multifunctional early warning and continuous blocking device for karst soil cave foundation according to claim 1 is characterized in that: One-way valves are provided in each of the plurality of side claws (4), and the lengths of the plurality of side claws (4) decrease in order from high to low.

4. A multifunctional early warning and continuous blocking method for karst soil cave foundations, characterized by: The method is applied to the device for multifunctional early warning and continuous blocking of karst soil cave foundations as described in claim 1, and the method comprises the following steps: Step 1: After the foundation soil of the tower (1) is excavated, a sand and gravel cushion layer (5) is laid; Step 2: After the laying is completed, the initial soil replacement treatment is carried out, and the soil area near the tower legs of the tower (1) is defined as the foundation soil treatment area (15); Step 3: excavate side trenches (8) around the bottom of the foundation soil treatment area (15), place the storage box (6) and the thermal sensor (7), and fill the storage box (6) with calcium oxide particles; Step 4: pre-buried the liquid delivery pipe (3) in the foundation soil treatment area (15), installed multiple side claws (4) at intervals along the vertical direction on the outside of the liquid delivery pipe (3), and simultaneously connected the two ends of the inner pipe (31) to the urease storage tank (9), and set a precipitation platform (12) on the outer ring of the tower (1); Step 5: When soil holes develop around the foundation soil treatment area (15), water seeps from the bottom of the storage box (6), and the calcium oxide particles inside the storage box (6) react with the water to release heat, stimulating the thermal sensor (7) to sound an alarm; Step 6: spraying the pre-mixed urea solution through the precipitation platform (12) according to the alarm information; Step 7: When the urea solution has successfully infiltrated into the soil at different levels, the urease storage tank (9) is opened, the urease solution is controlled to flow through the liquid delivery tube (3) and the urease solution is delivered to the soil at different levels through the side claws (4); Step 8: Repeat steps 6 and 7, and determine the degree of solidification of the urea solution and urease solution combined with the calcium ion reaction. When the solidification degree is the same as the set solidification degree, stop spraying the urea solution and stop delivering the urease solution, and the karst soil cave foundation is sealed.

5. The multifunctional early warning and continuous blocking method for karst soil cave foundation according to claim 4 is characterized in that: The specific steps of judging the degree of solidification of the urea solution and the urease solution combined with the calcium ion reaction in step eight are as follows: The first baffle plate (34) and the second baffle plate (35) of the liquid infusion tube (3) are both closed by controlling the power device, and two openings are respectively drawn out from the upper part of the outer tube (32). Air pressure is injected into one of the openings, and the air pressure of the second opening is detected. If the difference between the injected air pressure and the detected air pressure of the opening is not greater than a set threshold value, it indicates that the curing degree is the same as the set curing degree.

6. The multifunctional early warning and continuous blocking method for karst soil cave foundation according to claim 4 is characterized in that: After the infusion pipe (3) is pre-buried, sand is poured into the outer pipe (32) of the infusion pipe (3). When soil holes are developed around the foundation soil treatment area (15), the degree of soil hole development is judged by observing the height of the sand in the outer pipe (32) in real time, and sand is added to the outer pipe (32). After the addition, the sealing effect of the sand is judged.

7. The multifunctional early warning and continuous blocking method for karst soil cave foundation according to claim 6 is characterized in that: The specific steps of judging the filling effect of sand are as follows: The first baffle plate (34) of the liquid infusion tube (3) is opened and the second baffle plate (35) is closed by controlling the power device. Two openings are respectively drawn out from the upper part of the outer tube (32). Air pressure is injected into one of the openings, and the air pressure of the other opening is tested. If the air pressure of one opening is obviously not injected or the air pressure of the other opening is very small, it indicates that the sand filling effect is good.

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