Fluorescent plugging agent visible at night and use method thereof

Abstract

The invention relates to a fluorescent plugging agent visible at night and a use method thereof, the fluorescent plugging agent comprises the following components in percentage by weight: 50%-60% of cement, 25%-35% of water glass, 8%-15% of fluorescent pigment and 2%-5% of high-molecular polymer. The fluorescent plugging agent visible at night has good plugging performance, can effectively prevent loss of water flow and silt, and enhances the stability and safety of a foundation pit; the grouting material has good permeability and can smoothly enter cracks and holes in stratums to fill gaps and increase the compactness of a soil body; good durability is achieved, and aging, cracking and falling are not prone to occurring; the fluorescent grouting material has good visual performance, can emit fluorescent light at night or in a dark place, facilitates observation of penetration and distribution conditions of the fluorescent grouting material, facilitates positioning of grouting positions, control of grouting amount and grouting effect, and facilitates inspection and maintenance after leaking stoppage.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and in particular relates to a fluorescent leak-proofing agent that is visible at night and a use method thereof. Background Art

[0002] Leakage in foundation pits is a common problem in engineering construction. It will affect the stability and safety of the foundation pit and even cause settlement and damage to surrounding buildings. When the foundation pit water-stop curtain leaks and the leakage is large and carries mud and sand, grouting outside the pit is usually used to stop the leak. Currently, the commonly used plugging agents for grouting outside the pit include cement slurry, water glass, polyurethane, etc. These plugging agents have a certain sealing effect, but there are also some disadvantages, such as slow coagulation of cement slurry and inaccurate positioning of leakage points. Foundation pit plugging must be carried out in time after the leakage is discovered, and nighttime construction is often required. When ordinary plugging agents are used at night or in the dark, it is difficult to observe their penetration and distribution, which is not conducive to judging the seepage situation, controlling the grouting volume and grouting effect, and is not convenient for inspection and maintenance after plugging.

[0003] Therefore, how to provide a fluorescent plugging agent that is visible at night and a method of using the same is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0004] The present invention provides a night-time visible fluorescent plugging agent and a method for using the same. When a foundation pit leaks and grouting outside the pit is used for plugging, the plugging agent can emit fluorescence at night or in the dark, making it convenient for construction workers to observe its penetration and distribution, facilitating the determination of foundation pit leakage flow, locating grouting positions, controlling grouting volume and grouting effects, and facilitating inspection and maintenance after plugging.

[0005] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0006] A night-time visible fluorescent plugging agent comprises cement, water glass, fluorescent pigment, and high molecular polymer, and the proportions thereof in weight percentage are as follows:

[0007] Cement 50% to 60%, water glass 25% to 35%, fluorescent pigment 8% to 15% and high molecular polymer 2% to 5%.

[0008] Furthermore, the cement used is either ordinary Portland cement or rapid-hardening Portland cement. After the cement slurry is injected outside the pit, it solidifies to form a solid structure that can fill the gaps and holes in the foundation pit's water-stopping curtain structure. Rapid-hardening Portland cement can be used to accelerate the setting of large leaks requiring rapid plugging.

[0009] Furthermore, the water glass is a sodium silicate aqueous solution, which has good waterproof and adhesive properties, and is conducive to forming a waterproof layer outside the leaking water-stop curtain to prevent water penetration.

[0010] Furthermore, the high molecular polymer is made of polyurethane or epoxy resin. The high molecular polymer has good waterproof, adhesive and corrosion resistance, which is conducive to quickly forming a waterproof layer outside the leaking water-stop curtain and improving the ability of the waterproof layer to resist corrosion damage caused by chemical substances.

[0011] Furthermore, the fluorescent pigment is a fluorescent pigment, selected from zinc oxide, zinc sulfide, or calcium sulfide. Fluorescent pigments fluoresce under nighttime illumination, facilitating rapid identification of the penetration and distribution of the fluorescent plugging agent during nighttime use. When using a multi-hole grouting method, the fluorescent pigment added to the slurry pools corresponding to different boreholes needs to be doped with an activator to produce different colors. For example, copper can produce green fluorescence, while manganese can produce yellow fluorescence.

[0012] The present invention also provides a method for using a night-time visible fluorescent plugging agent, which comprises the following steps:

[0013] Step S1, finding and cleaning the leaking area of the foundation pit: finding the location inside the foundation pit that is predicted to be the source of the leak, and cleaning the inside of the predicted leaking point and the surrounding area of the hole;

[0014] Step S2, drilling outside the foundation pit: Position the drilling rig outside the leaking area of the foundation pit and adjust the verticality to drill the first hole to a depth of about 1 m below the predicted leaking point;

[0015] Step S3, placing the grouting pipe: after drilling to the depth, lift the drill rod and place the grouting pipe; connect a three-way Y-shaped pipe with two valves to the grouting pipe;

[0016] Step S4, locating the grouting position and determining the foundation pit leakage flow rate: The observer observes near the leaking point inside the foundation pit; measures the coordinates and height of the exact location of the leaking point, and adjusts the grouting pipe to the leaking point; closes the grouting pipe, and after the water flowing out of the foundation pit stops fluorescing, reopens the grouting pipe and injects 50L of a fluorescent mixture of cement slurry and fluorescent pigment; the observer in the pit records the time from the start of fluorescence to the cessation of fluorescence in the water flowing out of the foundation pit, and calculates the foundation pit leakage flow rate according to the following formula:

[0017] Q = V / t, where Q is the flow rate in liters per second; V is the volume of cement slurry injected in liters.

[0018] t: flow time, in seconds;

[0019] Step S5, adjusting the height of the grouting pipe: with the first borehole as the center, drill other boreholes along the edge of the foundation pit, with the same spacing between the boreholes; place a grouting pipe in each borehole, connect the three-way Y-shaped pipe and the grouting pump; adjust the height of the grouting pipes of all boreholes according to the measured coordinates and height of the exact location of the leak point;

[0020] Step S6, preparing a fluorescent leak-proofing agent that is visible at night;

[0021] Step S7, formal grouting: first, inject a fluorescent mixture of cement slurry and fluorescent pigment into the first grouting pipe, use an ultraviolet lamp or other light source to illuminate the leaking point, and confirm that the fluorescent mixture flows out continuously; then inject a second mixture of water glass and high molecular polymer into the second grouting pipe, so that the two slurries are mixed in the terminal of the three-way Y-shaped pipe to form a fluorescent plugging agent that is visible at night. The grouting pressure during plugging is 0.5-1MPa, and the two grouting pumps inject at the same pump pressure; at the same time, the observer uses an ultraviolet lamp or other light source to illuminate the leaking point near the leaking point on the inside of the foundation pit to observe the overflow of slurries of different colors; for slurry with a large overflow volume, determine the source borehole based on the color, and maintain the grouting volume of the corresponding grouting equipment; for slurry with a small overflow volume, determine the source borehole based on the color, and gradually reduce the grouting volume of the corresponding grouting equipment to save slurry;

[0022] Step S8, grouting is completed: when a viscous mixed slurry appears at the leaking point, accompanied by bubbles, the leaking point is sealed with a woven bag. When the water flow gradually decreases until it stops, the grouting is stopped. After observing for 1 hour, it is decided whether to continue grouting;

[0023] Step S9, check after grouting: If no new leakage occurs, the plugging construction is completed; if a large flow of water appears again near the leakage point and no fluorescence is emitted, it proves that the foundation pit leakage has not been completely blocked and the plugging construction needs to be performed again.

[0024] Furthermore, step S6 includes:

[0025] The first step is to mix the cement slurry and the fluorescent pigment in proportion to obtain a fluorescent mixed solution;

[0026] Step 2: Evenly mix the water glass and the high molecular polymer in proportion to obtain a second mixed solution;

[0027] The third step is to use the fluorescent mixed liquid alone during the period of locating the grouting position and determining the leakage flow rate of the foundation pit; after the grouting position is located, the fluorescent mixed liquid and the second mixed liquid are mixed evenly in proportion during the formal grouting to obtain a fluorescent plugging agent that is visible at night.

[0028] Furthermore, the grouting position positioning method in step S4 is: injecting a fluorescent mixture of cement slurry and fluorescent pigment into the grouting pipe, and the observer uses an ultraviolet lamp or other light source to illuminate the leaking point near the leaking point inside the foundation pit for observation; if no fluorescence can be observed, it is necessary to adjust the drilling position and re-place the grouting pipe; if the water flowing out of the leaking point is observed to emit fluorescence, it proves that the grouting pipe is located near the leaking point, and the outflow position of the fluorescent water flow is the exact position of the leaking point; the observer uses measuring equipment to measure the coordinates and height of the exact position of the leaking point; after the leaking point position is positioned, the grouting pipe is adjusted to the leaking point according to the measured coordinates and height of the exact position of the leaking point.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] The present invention provides a night-time visible fluorescent plugging agent and a method for using the same. The agent comprises cement, water glass, fluorescent pigment, and a polymer, wherein the weight percentages are as follows: 50% to 60% cement, 25% to 35% water glass, 8% to 15% fluorescent pigment, and 2% to 5% polymer. The night-time visible fluorescent plugging agent has excellent sealing performance, effectively preventing the loss of water and sediment, and enhancing the stability and safety of foundation pits. The agent has excellent permeability, enabling it to smoothly penetrate cracks and holes in the stratum, fill gaps, and increase the density of the soil. The agent has excellent durability, resisting corrosion from groundwater, acids, alkalis, and salts, and is not susceptible to aging, cracking, or shedding. The agent has excellent visibility, emitting fluorescence at night or in the dark, making it easy to observe its penetration and distribution, facilitating the positioning of grouting, controlling the grouting volume and grouting effect, and facilitating inspection and maintenance after plugging. The agent also has excellent environmental performance, containing no toxic or harmful substances, and causing no pollution or harm to the environment or human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of drilling a hole outside a foundation pit in a method for using a night-time visible fluorescent plugging agent according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of grouting in a method for using a fluorescent plugging agent that is visible at night according to an embodiment of the present invention.

[0033] In the picture:

[0034] 1- Leaking area, 2- Drilling rig, 3- Leaking point, 4- Water-stop curtain, 5- Grouting pipe, 6- Three-way Y-type pipe, 7- Valve one, 8- Valve two, 9- Grouting pump, 10- Fluorescent mixed liquid slurry pool, 11- Second mixed liquid slurry pool, 12- Measuring equipment, 13- Drill pipe. DETAILED DESCRIPTION

[0035] The following is a further detailed description of a night-time visible fluorescent plugging agent and its use method provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description.

[0036] The following combination Figure 1 and Figure 2 , describe in detail the night-time visible fluorescent plugging agent of the present invention and its use method.

[0037] refer to Figure 1 and Figure 2 A night-time visible fluorescent plugging agent includes cement, water glass, fluorescent pigment, and high molecular polymer. The proportions by weight are as follows: 50% to 60% cement, 25% to 35% water glass, 8% to 15% fluorescent pigment, and 2% to 5% high molecular polymer.

[0038] In this embodiment, the preferred cement is ordinary Portland cement or rapid-hardening Portland cement. After the cement slurry is injected outside the pit, it solidifies to form a solid structure that can fill the gaps and holes in the foundation pit water-stop curtain structure at the leakage point. Rapid-hardening Portland cement can be used to accelerate the cement setting speed when large leaks require rapid plugging.

[0039] In this embodiment, more preferably, the water glass is a sodium silicate aqueous solution. The sodium silicate aqueous solution has good waterproof and adhesive properties, which is conducive to forming a waterproof layer outside the leaking water-stop curtain 4 to prevent water penetration.

[0040] In this embodiment, the polymer is preferably made of polyurethane or epoxy resin. The polymer has good waterproof, adhesive, and corrosion resistance properties, which facilitates the rapid formation of a waterproof layer outside the leaking water-stop curtain and improves the waterproof layer's ability to resist chemical corrosion damage.

[0041] In this embodiment, the fluorescent pigment is preferably a fluorescent pigment, such as zinc oxide, zinc sulfide, or calcium sulfide. The fluorescent pigment fluoresces under nighttime illumination, facilitating rapid identification of the penetration and distribution of the fluorescent plugging agent during nighttime use. When using a multi-hole grouting method, the fluorescent pigment added to the slurry pool corresponding to different boreholes needs to be doped with an activator to produce different colors. For example, copper can produce green fluorescence, while manganese can produce yellow fluorescence.

[0042] Please continue to refer to Figure 1 and Figure 2 The present invention also provides a method for using a night-time visible fluorescent plugging agent, which comprises the following steps:

[0043] Step S1, finding and cleaning the foundation pit leaking area 1: finding the location predicted to be the source of the leak inside the foundation pit, and cleaning the inside of the predicted leaking point 3 and the surrounding area of the hole;

[0044] Step S2, drilling outside the foundation pit: Position the drilling rig 2 outside the leaking area of the foundation pit and adjust the verticality to drill the first hole to a depth of about 1 m below the predicted leaking point 3;

[0045] Step S3, placing the grouting pipe 5: After drilling to the depth, lift the drill rod 13 and place the grouting pipe 5; connect the tee Y-shaped pipe 6 with two valves to the grouting pipe; the two valves are valve 1 7 and valve 2 8;

[0046] Specifically, a fluorescent mixed solution is prepared by uniformly mixing ordinary Portland cement slurry and fluorescent pigment in proportion according to the components;

[0047] Step S4, locating the grouting position and determining the foundation pit leakage flow rate: a fluorescent mixture of cement slurry and fluorescent pigment is injected into the grouting pipe 5, and the observer uses an ultraviolet lamp or other light source to illuminate the leaking point near the leaking point inside the foundation pit for observation; if no fluorescence is observed, it is necessary to adjust the drilling position and re-place the grouting pipe 5; if the water flowing out of the leaking point is observed to emit fluorescence, it is proved that the grouting pipe is indeed located near the leaking point 3, and the gushing position of the fluorescent water flow is the exact position of the leaking point; the observer uses the measuring equipment 12 to measure the coordinates and height of the exact position of the leaking point; after the leaking point position is located, the grouting pipe 5 is adjusted to the leaking point according to the measured coordinates and height of the exact position of the leaking point;

[0048] Determining the foundation pit leakage flow rate involves closing the grouting pipe 5, waiting for the water flowing out of the foundation pit to stop fluorescing, then reopening the grouting pipe 5 and injecting 50L of fluorescent mixed liquid. Observers in the pit record the time from the beginning to the end of fluorescence in the water flowing out of the foundation pit, and calculating the foundation pit leakage flow rate according to the following formula:

[0049] Q=V / t

[0050] Where, Q: flow rate, unit is liter / second (L / s); V: volume of injected cement slurry, unit is liter (L);

[0051] t: flow time, in seconds (s).

[0052] For example, if it takes 25 seconds to inject 50 liters of cement slurry, the flow rate is Q = 50 / 25 = 2 L / s.

[0053] When the foundation pit leakage flow rate is greater than 5L / s, the rapid plugging mode should be adopted, that is, the cement in the fluorescent plugging agent should be fast-hardening silicate cement.

[0054] Step S5, adjusting the height of the grouting pipe: with the first borehole as the center, drill other boreholes along the edge of the foundation pit, with the same spacing between the boreholes; place a grouting pipe in each borehole, connect the three-way Y-shaped pipe and the grouting pump; adjust the height of the grouting pipes of all boreholes according to the measured coordinates and height of the exact location of the leak point;

[0055] Step S6, preparing a fluorescent leak-proofing agent that is visible at night;

[0056] Step S7, formal grouting: first, a grouting pump 9 is used to inject a fluorescent mixture of cement slurry and fluorescent pigment into the first grouting pipe through the fluorescent mixture slurry pool 10, and an ultraviolet lamp or other light source is used to illuminate the leaking point to confirm that the fluorescent mixture flows out continuously; then another grouting pump is used to inject a second mixture of water glass and high molecular polymer into the second grouting pipe through the second mixture slurry pool 11, so that the two slurries are mixed in the terminal of the three-way Y-tube 6 to form a fluorescent plugging agent that is visible at night. The grouting pressure during plugging is 0.5-1MPa, and the two grouting pumps inject at the same pump pressure; at the same time, the observer uses an ultraviolet lamp or other light source to illuminate the leaking point near the leaking point on the inside of the foundation pit to observe the overflow of slurries of different colors; for slurries with a large amount of overflow, the borehole from which it originates is determined based on the color, and the grouting amount of the corresponding grouting equipment is maintained; for slurries with a small amount of overflow, the borehole from which it originates is determined based on the color, and the grouting amount of the corresponding grouting equipment is gradually reduced to save slurry;

[0057] Step S8, grouting is completed: when a viscous mixed slurry appears at the leaking point, accompanied by bubbles, the leaking point is sealed with a woven bag. When the water flow gradually decreases until it stops, the grouting is stopped. After observing for 1 hour, it is decided whether to continue grouting;

[0058] Step S9, check after grouting: If no new leakage occurs, the plugging construction is completed; if a large flow of water appears again near the leakage point and no fluorescence is emitted, it proves that the foundation pit leakage has not been completely blocked and the plugging construction needs to be performed again.

[0059] Furthermore, step S6 includes:

[0060] The first step is to mix the cement slurry and the fluorescent pigment in proportion to obtain a fluorescent mixed solution;

[0061] Step 2: Evenly mix the water glass and the high molecular polymer in proportion to obtain a second mixed solution;

[0062] The third step is to use the fluorescent mixed liquid alone during the period of locating the grouting position and determining the leakage flow rate of the foundation pit; after the grouting position is located, the fluorescent mixed liquid and the second mixed liquid are mixed evenly in proportion during the formal grouting to obtain a fluorescent plugging agent that is visible at night.

[0063] In particular, the grouting position positioning method in step S4 is: injecting a fluorescent mixture of cement slurry and fluorescent pigment into the grouting pipe, and the observer uses an ultraviolet lamp or other light source to illuminate the leaking point near the leaking point inside the foundation pit for observation; if no fluorescence can be observed, it is necessary to adjust the drilling position and re-place the grouting pipe; if the water flowing out of the leaking point is observed to emit fluorescence, it proves that the grouting pipe is located near the leaking point, and the outflow position of the fluorescent water flow is the exact position of the leaking point; the observer uses a measuring device to measure the coordinates and height of the exact position of the leaking point; after the leaking point position is positioned, the grouting pipe is adjusted to the leaking point according to the measured coordinates and height of the exact position of the leaking point.

[0064] The components were weighed according to the formula in Table 1 and mixed evenly according to the preparation method of the present invention to obtain the night-time visible fluorescent plugging agent of the present invention. A plugging agent without fluorescent pigment was used as a control group.

[0065] Table 1 is the plugging agent formula of Examples 1 to 3 and the control group

[0066] raw material Example 1 (kg) Example 2 (kg) Example 3 (kg) Control group (kg) cement 1000 1000 1000 1200 water glass 700 700 700 700 Fluorescent pigments 160 200 240 0 polymers 140 100 60 100 total 2000 2000 2000 2000

[0067] Using the method described herein for applying a night-visible fluorescent plugging agent, simulated plugging tests were conducted using the plugging agents from Examples 1 to 3 and a control group to verify their effectiveness. Key tests included the plugging agent's nighttime visibility, total grouting time, and plugging agent consumption. Table 2 shows the results.

[0068] Table 2 shows the test results of simulated plugging using the plugging agents of Examples 1 to 3 and the control group.

[0069] Night visibility Total grouting time (min) Sealing agent consumption (kg) Example 1 good 152 1521 Example 2 good 164 1586 Example 3 good 166 1596 control group Difference 193 1890

[0070] It can be seen that the night-visible fluorescent plugging agent provided by the embodiment of the present invention has good night visibility effect, which not only saves grouting time but also significantly reduces the consumption of plugging agent, and has good promotion value.

[0071] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only express several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations and improvements can be made, which all fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the attached claims.

Claims

1. A fluorescent plugging agent visible at night, characterized in that: It includes cement, water glass, fluorescent pigment and high molecular polymer, and the proportions by weight are as follows: Cement 50% to 60%, water glass 25% to 35%, fluorescent pigment 8% to 15% and high molecular polymer 2% to 5%.

2. The night-time visible fluorescent plugging agent according to claim 1, characterized in that: The cement is selected from ordinary Portland cement or rapid hardening Portland cement.

3. The night-time visible fluorescent plugging agent according to claim 1, characterized in that: The water glass is a sodium silicate aqueous solution.

4. The night-time visible fluorescent plugging agent according to claim 1, characterized in that: The high molecular polymer is selected from polyurethane or epoxy resin material.

5. The night-time visible fluorescent plugging agent according to claim 1, characterized in that: The fluorescent pigment is a pigment with fluorescent properties, and is selected from zinc oxide, zinc sulfide or calcium sulfide.

6. A method for using a night-time visible fluorescent plugging agent, characterized in that: The steps include: Step S1, finding and cleaning the leaking area of the foundation pit: finding the location inside the foundation pit that is predicted to be the source of the leak, and cleaning the inside of the predicted leak point and the surrounding area of the hole; Step S2, drilling a hole outside the foundation pit: positioning the drilling rig outside the leaking area of the foundation pit and adjusting the verticality, and drilling a first hole; Step S3, placing the grouting pipe: after drilling to the depth, lift the drill rod and place the grouting pipe; connect a three-way Y-shaped pipe with two valves to the grouting pipe; Step S4, locating the grouting position and determining the foundation pit leakage flow rate: The observer observes near the leaking point inside the foundation pit; measures the coordinates and height of the exact location of the leaking point, and adjusts the grouting pipe to the leaking point; closes the grouting pipe, and after the water flowing out of the foundation pit stops fluorescing, reopens the grouting pipe and injects 50L of a fluorescent mixture of cement slurry and fluorescent pigment; the observer in the pit records the time from the start of fluorescence to the cessation of fluorescence in the water flowing out of the foundation pit, and calculates the foundation pit leakage flow rate according to the following formula: Q = V / t, where Q is flow rate in liters per second; V: volume of cement slurry injected, in liters; t: flow time, in seconds; Step S5, adjusting the height of the grouting pipe: with the first borehole as the center, drill other boreholes along the edge of the foundation pit, with the same spacing between the boreholes; place a grouting pipe in each borehole, connect the three-way Y-shaped pipe and the grouting pump; adjust the height of the grouting pipes of all boreholes according to the measured coordinates and height of the exact location of the leak point; Step S6, preparing a fluorescent leak-proofing agent that is visible at night; Step S7, formal grouting: first, inject a fluorescent mixture of cement slurry and fluorescent pigment into the first grouting pipe, use an ultraviolet lamp or other light source to illuminate the leaking point, and confirm that the fluorescent mixture flows out continuously; then inject a second mixture of water glass and high molecular polymer into the second grouting pipe, so that the two slurries are mixed in the terminal of the three-way Y-shaped pipe to form a fluorescent plugging agent that is visible at night. The grouting pressure during plugging is 0.5-1MPa, and the two grouting pumps inject at the same pump pressure; at the same time, the observer uses an ultraviolet lamp or other light source to illuminate the leaking point near the leaking point on the inside of the foundation pit to observe the overflow of slurries of different colors; for slurry with a large overflow volume, determine the source borehole based on the color, and maintain the grouting volume of the corresponding grouting equipment; for slurry with a small overflow volume, determine the source borehole based on the color, and gradually reduce the grouting volume of the corresponding grouting equipment to save slurry; Step S8, grouting is completed: when a viscous mixed slurry appears at the leaking point accompanied by bubbles, grouting is stopped; Step S9, check after grouting: if no new leakage occurs, the plugging construction is completed; If the foundation pit leakage is not completely blocked, it is necessary to carry out the plugging work again.

7. The method of use according to claim 6, characterized in that: The step S6 comprises: The first step is to mix the cement slurry and the fluorescent pigment in proportion to obtain a fluorescent mixed solution; Step 2: Evenly mix the water glass and the high molecular polymer in proportion to obtain a second mixed solution; The third step is to use the fluorescent mixed liquid alone during the period of locating the grouting position and determining the leakage flow rate of the foundation pit; after the grouting position is located, the fluorescent mixed liquid and the second mixed liquid are mixed evenly in proportion during the formal grouting to obtain a fluorescent plugging agent that is visible at night.

8. The method of use according to claim 6, characterized in that: The grouting position positioning method in step S4 is as follows: a fluorescent mixture of cement slurry and fluorescent pigment is injected into the grouting pipe, and an observer uses an ultraviolet lamp or other light source to illuminate the leaking point near the leaking point inside the foundation pit for observation; if fluorescence cannot be observed, the drilling position needs to be adjusted and the grouting pipe needs to be re-placed; if the water flowing out of the leaking point is observed to emit fluorescence, it proves that the grouting pipe is located near the leaking point, and the outflow position of the fluorescent water flow is the exact position of the leaking point; the observer uses a measuring device to measure the coordinates and height of the exact position of the leaking point; after the leaking point position is positioned, the grouting pipe is adjusted to the leaking point according to the measured coordinates and height of the exact position of the leaking point.

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