Culvert pipe plugging method for overflow well

Abstract

The invention discloses a culvert pipe plugging method of an overflow well, and relates to the technical field of culvert pipe plugging, and the method comprises the following steps: S1, foundation preparation; s2, monitoring water leakage; s21, monitoring no overflow water at the outlet end of the culvert pipe; s22, monitoring that water leakage still exists at the outlet end of the culvert pipe; s3, secondary water leakage monitoring; s31, the lower section of the intra-tube air bag is free of water; and S32, water flow still exists in the section below the air bag in the pipe. Through cooperative operation of the pipeline 1, the pipeline 2 and the drainage grouting pipe, when drilling is conducted above the culvert pipe, exposed tailings cannot be discharged into the culvert pipe, and collapse caverns cannot be formed above the culvert pipe. Before a hole is drilled above the culvert pipe, high-strength grout injected in advance through the pipeline 1 and the pipeline 2 forms a sealing layer at the moment that tailings are exposed out of the drilled hole, and the tailings are prevented from flowing into the culvert pipe along cracks of the drilled hole.

Description

Technical Field

[0001] This invention relates to the field of culvert plugging technology, and in particular to a method for plugging overflow wells. Background Technology

[0002] Overflow wells are used in intercepting combined sewer systems to separate rainwater from sewage. When the mixed sewage upstream exceeds the capacity of the intercepting main pipe, the excess water overflows through the overflow well and is discharged into the water body, reducing the load on the sewage treatment plant. Common types include intercepting troughs, overflow weirs, and skip weirs, and are often located at the junction of the combined sewer and the intercepting main pipe. Overflow well culverts are pipes connecting the overflow wells and are used for functions such as flood discharge, sediment removal, and irrigation. They are mostly made of concrete, metal, or precast box culverts. Long-term operation can lead to leakage, cracks, or structural damage.

[0003] However, in existing overflow well culvert sealing processes, construction units drill holes into the culvert below the platform. When the borehole punctures the culvert, tailings exposed above it rapidly leak into the culvert, forming a collapse above it. This can result in a massive amount of tailings leakage. If the collapse above the culvert is not reinforced in time, it may continue to expand, causing wider ground subsidence or collapse, threatening the safety of surrounding buildings, roads, bridges, and other infrastructure. Furthermore, tailings leakage may alter the underground stress distribution, triggering landslides and crack expansion in the surrounding rock and soil, inducing secondary geological disasters such as landslides and debris flows.

[0004] There are already relevant invention patents concerning culvert sealing, as detailed below:

[0005] Chinese Patent Application No. CN202410642679.8, entitled "A Throttling and Blocking Structure and Method for Controlling the Flow Pattern of a Tailings Dam Drainage System," discloses a throttling and blocking structure and method for controlling the flow pattern of a tailings dam drainage system. This is achieved through a combination of counterweight piers, gate chute, throttling gate, blocking gate, gate support, throttling gate lifting electric hoist, blocking gate lifting electric hoist, and wire rope. The throttling gate controls the flow pattern of the tailings dam drainage system's return water, transforming the normal return water flow from free flow to semi-pressure or pressure flow. This ensures that the drainage culverts are completely filled with water and the drainage wells are partially filled with water in a balanced state. When tailings leak from the drainage system, they flow into the drainage culverts at a lower speed, effectively eliminating the water hammer effect. The blocking gate then seals the drainage system, safely containing the tailings and preventing leakage that could cause safety and environmental accidents. The entire construction process is fast and inexpensive, reducing production and operating costs for enterprises.

[0006] While the aforementioned existing patents can seal the drainage system by using a gate to safely contain tailings and prevent leakage, the gate's sliding groove needs to be precisely aligned with the drainage culvert's cross-section. Construction errors can lead to seal failure. Furthermore, in the event of a sudden tailings leak, the electric hoist's operation to lift the gate is time-consuming. Moreover, existing patents involve multiple components working together, including counterweights, gate sliding grooves, electric hoists, and wire ropes. Long-term operation in a humid and corrosive tailings dam environment can easily lead to mechanical wear, electric hoist malfunctions, and wire rope corrosion, increasing maintenance frequency and cost. Summary of the Invention

[0007] The purpose of this application is to provide a method for plugging overflow wells through culverts, which solves the problem that immediate plugging cannot be achieved in the prior art.

[0008] This invention involves installing two rubber airbags upstream of the culvert outlet for isolation, with polyurethane injected between the two airbags. The culvert outlet is sealed with masonry and M10 mortar. After both ends are sealed and isolated, holes are drilled into the drainage culvert from walkway platforms at different elevations, and sleeves are installed. The sealed section of the culvert is then filled and solidified by pressure grouting. The grout type is a two-component grout of cement mortar and water glass.

[0009] A method for sealing the culvert of an overflow well, specifically including the following steps:

[0010] S1, Basic Preparation: Personnel enter the overflow well and use a pneumatic pick to remove cement and water glass slurry stones. While cleaning, a submersible pump is used to drain the water. Grouting pipes 1 and 2 are sent into the culvert at the outlet end of the culvert. The condition of the culvert section with rubber airbags is checked. Rubber airbags are manually sent into the culvert at the bottom of the well and inflated to the design pressure. Drainage in the well is stopped, and the rise in water level is observed.

[0011] S2, Leakage Detection.

[0012] S21, monitoring for no overflow at the culvert outlet: After the airbag is inflated, the outlet of the culvert is sealed, and then the concrete is cured. Grouting is carried out through pipe 1. When grout overflows at the outer port of pipe 2, the valve at the outer port of pipe 1 is closed, and grouting is carried out through grouting pipe 2 until the grouting is completed.

[0013] S22, leakage is still detected at the outlet end of the culvert: personnel are arranged to enter the culvert, cut off the drill bit inserted into the pipe, and then send in a camera to observe the status of the culvert. After confirming that the conditions for installing an airbag are met, another airbag is pushed to a certain distance using a drilling rig, and finally inflated to the design pressure and kept stable.

[0014] S3, secondary leakage monitoring.

[0015] S31, No water in the section below the airbag in the pipe: After pushing the other airbag mentioned in S22 to a certain distance, the outlet end of the culvert is sealed, and then the concrete is cured. Grouting is carried out through pipe 1. When the grouting of pipe 2 begins to return, switch to grouting through pipe 2. The sealing is completed when the grouting reaches the position of the other airbag.

[0016] S32, water still flows in the section below the airbag in the pipe: After pushing the other airbag mentioned in S22 to a certain distance, add a drainage grouting pipe, then seal the outlet end and cure the concrete. Grout through pipe 1 under dynamic water conditions. When pipe 2 starts to return grout, switch to grouting through pipe 2. When grout appears in the drainage grouting pipe, stop grouting through pipe 2. Finally, cure for 24 hours. During the curing period, keep the drainage grouting pipe draining normally. When grouting is restored through the drainage pipe to the position of the other airbag, the sealing is completed.

[0017] As a further improvement of the present invention, in step S1, before removing the cement and water glass slurry stones at the bottom of the well, a water pump is installed at the bottom of the well to pump out the water flowing into the well. During the use of the pneumatic drill, the air supply pipeline is suspended by a suitable steel wire rope and firmly fixed to the ground. A 36V lighting device is pre-installed in the overflow well. Before entering the overflow well, personnel wear safety belts, which are secured to the ground using nylon ropes. During the lowering and installation of the rubber airbag, care must be taken to avoid scratching the airbag. Through integrated innovation of refined safety protection, systematic equipment protection, dynamic process response, and visualized treatment effects, the sustainable goal of safe, efficient, and precise overflow well leakage treatment is achieved.

[0018] As a further improvement of the present invention, in step S21, the diameter of pipe 1 and pipe 2 is 40-50 mm, the length of pipe 1 is 5-10 m, the length of pipe 2 is 130-135 m, the curing time of the concrete is 48-72 hours, and pipe 1 and pipe 2 are connected by an internal joint, which is threaded to pipe 1 and pipe 2. The short pipe design of pipe 1 reduces the resistance to grout delivery, ensuring that the grout quickly reaches the leakage point during the initial grouting stage and avoiding pressure attenuation due to excessive pipe length. The long pipe design of pipe 2 balances the grout diffusion range and delivery efficiency.

[0019] As a further improvement of the present invention, the strength grade of the concrete is C20, an appropriate amount of concrete early-strength agent is added during the concrete production, the grouting slurry is a single-component cement slurry with a water-cement ratio of 0.75~1:1, the cement is fresh, lump-free P.O42.5 grade ordinary Portland cement, the mixing time of the cement slurry needs to be higher than 3 minutes, and the slurry aggregate needs to be solidified to a position of 185m~195m in the culvert. At a water-cement ratio of 0.75:1, the slurry viscosity is ≤30mPa·s, and the fluidity index is ≥25s, meeting the requirements for long-distance transportation and thus avoiding pipeline blockage or excessive pressure loss due to excessive viscosity.

[0020] As a further improvement of the present invention, in step S22, the certain distance is 185m~195m. After the drill bit is removed, a steel flat drill is used to clean the debris in the gap between the pipe wall and the drill bit annular wall. After cleaning, cotton is manually wedged into the annular wall gap. The cotton is wedged tightly with wooden wedges. The cotton wedging is used to ensure that it does not enter the tailings body outside the culvert during grouting in the annular wall gap. After the cotton is wedged into the gap, it absorbs the moisture of the grout and expands, filling the tiny cracks and forming a flexible sealing layer, thereby preventing the grout from penetrating into the tailings body. The wooden wedges compress the cotton to 60%~70% of its initial thickness through wedging force, ensuring that the cotton is tightly attached to the pipe wall and the drill bit annular wall, avoiding displacement or falling off of the cotton due to grouting pressure.

[0021] As a further improvement of the present invention, in step S3, the certain distance is 185m~195m, and the rubber airbag is inflated according to the designed inflation pressure.

[0022] As a further improvement of the present invention, an integrated intelligent monitoring module is provided in the pipeline 1 and the pipeline 2. The integrated intelligent monitoring module includes a pressure sensor array, an electromagnetic flow meter and a wireless data transmission module. The pressure sensors are arranged at intervals along the pipeline axis to collect grouting pressure data in real time. The flow monitoring unit uses an electromagnetic flow meter to accurately measure the instantaneous flow rate of the grout. The wireless module transmits the pressure and flow data to the ground control center in real time.

[0023] As a further improvement of the present invention, in step S32, the diameter of the drainage grouting pipe is 75~85mm, the length of the drainage grouting pipe is 185~190m, the end of the drainage grouting pipe away from the grouting port is in the shape of a flower tube, the length of the flower tube is 5~6m, the drainage grouting pipe adopts an adaptive drainage system, the adaptive drainage system includes a corrosion-resistant submersible pump set, a float level switch and an ultrasonic level gauge dual-mode monitoring unit, and an intelligent control cabinet with an integrated PLC controller. The adaptive drainage system automatically adjusts the start and stop frequency of the drainage pump according to the grout level change. The adjustment frequency is used to ensure that the water level in the culvert is maintained 30-50cm below the height of the airbag during the maintenance period.

[0024] Compared with the prior art, the beneficial effects of this invention are as follows:

[0025] 1. Through the coordinated operation of pipes 1 and 2 and the drainage grouting pipe, tailings exposed during drilling above the culvert will not leak into the culvert, and no collapse will form above the culvert. Before drilling above the culvert, high-strength grout pre-injected through pipes 1 and 2 forms a sealing layer the moment tailings are exposed during drilling, preventing tailings from flowing into the culvert along the drill hole cracks.

[0026] 2. By employing a tiered approach to address leakage, grouting methods are progressively upgraded based on the severity of the leak, avoiding indiscriminate grouting and thus preventing resource waste. This tiered approach prevents excessive grouting; initially, low-pressure grouting is used to treat minor leaks, consuming only a small amount of grout; as the leakage worsens, high-pressure grouting or chemical grout reinforcement is then employed. This on-demand supply model reduces grout waste and significantly lowers material costs. Furthermore, it avoids secondary damage to the culvert caused by excessive grouting.

[0027] 3. By using drainage grouting pipes and automated drainage control, the problems of grout being washed away and failing to solidify under dynamic water conditions in traditional grouting are solved. The drainage grouting pipes precisely control the grout injection position and pressure, and, in conjunction with the automated drainage system, adjust the water flow rate in real time to ensure rapid grout solidification in the target area. The automated system dynamically adjusts the initial setting time of the grout to adapt to dynamic water environments with different flow rates, preventing the grout from being dispersed by the water flow, thus ensuring that solidification is completed before the grout spreads.

[0028] 4. The short pipe design of Pipeline 1 reduces grout delivery resistance, ensuring the grout reaches the leak point quickly during the initial grouting stage and preventing pressure attenuation due to excessive pipe length. The long pipe design of Pipeline 2 balances the grout diffusion range and delivery efficiency. Furthermore, the 40-50mm pipe diameter maintains grout fluidity within a 130m pipe, while ensuring an end pressure ≥0.5MPa, meeting the requirements for deep leakage treatment. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart of the steps of the present invention.

[0031] Figure 2 This is a construction schematic diagram of Scheme 1 in this invention.

[0032] Figure 3 This is a partial schematic diagram of the culvert outlet end in Scheme 1 of the present invention.

[0033] Figure 4 This is a construction schematic diagram of Scheme 2 in this invention.

[0034] Figure 5 This is a partial schematic diagram of the culvert outlet end in Scheme 2 of the present invention.

[0035] Figure 6 This is a construction schematic diagram of Scheme 3 in this invention.

[0036] Figure 7 This is a partial schematic diagram of the culvert outlet end in Scheme 3 of the present invention.

[0037] Figure 8 For the present invention Figure 2 , Figure 4 and Figure 6 A magnified structural diagram of point A in the middle.

[0038] Figure 9 For the present invention Figure 2 , Figure 4 and Figure 6 A magnified structural diagram at point B in the middle. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] A method for sealing the culvert of an overflow well, such as Figure 1 As shown, it includes the following steps:

[0041] S1, Basic Preparation: Personnel enter the overflow well and use handheld pneumatic picks to remove cement and water glass slurry deposits. Simultaneously, a submersible pump is used to drain the water. Grouting pipes 1 and 2 are introduced into the culvert at the outlet end. The condition of the culvert section with the rubber airbag is checked. The rubber airbag is manually inserted into the culvert at the bottom of the well and inflated to the design pressure. Drainage in the well is stopped, and the water level rise is observed. Before removing the cement and water glass slurry deposits at the bottom of the well, a water pump is installed at the bottom to drain the water seeping into the well. During the use of the pneumatic pick, the air supply pipe is suspended by a suitable steel wire rope and securely fixed to the ground. A 36V lighting device is pre-installed in the overflow well. Personnel must wear safety belts before entering the overflow well, and the safety belts must be secured to the ground using nylon ropes. Care must be taken to avoid scratching the rubber airbag during its lowering and installation.

[0042] Integrated intelligent monitoring modules are installed in pipelines 1 and 2. The integrated intelligent monitoring modules include a pressure sensor array, an electromagnetic flow meter, and a wireless data transmission module. The pressure sensors are arranged at intervals along the pipeline axis to collect grouting pressure data in real time. The flow monitoring unit uses an electromagnetic flow meter to accurately measure the instantaneous flow rate of the grout. The wireless module transmits the pressure and flow data to the ground control center in real time.

[0043] Using integrated intelligent monitoring module technology as a comparison, the data advantages of this invention are analyzed in detail, and the specific comparison table is as follows:

[0044] Table 1 Comparison of Integrated Intelligent Monitoring Module Technology with Existing Technologies

[0045]

[0046] Based on Table 1 above, it can be concluded that, compared with existing technologies, the integrated intelligent monitoring module technology of this solution achieves a comprehensive upgrade in the monitoring of core data during grouting construction. At the data acquisition level, it transforms from a single-point, coarse-grained, manually intervened mode to array-based, precise, automated, and real-time acquisition; at the data flow level, wireless transmission eliminates the delays and errors associated with manual aggregation; ultimately, relying on real-time and reliable data support, it significantly improves the timeliness and accuracy of construction management, providing stronger technical support for the safety and quality stability of overflow well culvert grouting construction.

[0047] S2, Leakage Detection.

[0048] S21, monitoring for no overflow at the culvert outlet: After inflating the airbag, seal the culvert outlet. Then, cure the concrete and grout through pipe 1. When grout overflows from the outer port of pipe 2, close the valve at the outer port of pipe 1 and switch to grouting pipe 2 until grouting is complete. The diameter of pipes 1 and 2 is 40~50mm, the length of pipe 1 is 5~10m, and the length of pipe 2 is 130~135m. The curing time for concrete is 48~72 hours. Pipes 1 and 2 are connected by an internal joint, which is threaded to pipes 1 and 2. The concrete strength grade is C20. An appropriate amount of concrete early strength agent is added during concrete production. The grouting slurry type is single-component cement slurry with a water-cement ratio of 0.75 to 1:1. Fresh, lump-free P.O42.5 grade ordinary Portland cement is selected. The mixing time of the cement slurry must be higher than 3 minutes. The slurry aggregate must be solidified to a position of 185m to 195m in the culvert.

[0049] S22, leakage is still detected at the outlet end of the culvert: Personnel are dispatched to enter the culvert, remove the drill bit inserted into the pipe, and then a camera is sent in to observe the culvert's condition. After confirming that the conditions for installing an airbag are met, another airbag is pushed to a certain distance using a drilling rig, and finally inflated to the design pressure and kept stable. The certain distance is 185m~195m. After the drill bit is removed, a steel flat drill is used to clean the debris in the gap between the pipe wall and the drill bit's annular wall. After cleaning, cotton is manually wedged into the annular wall gap using a wedging method. Wooden wedges are used to tighten the cotton, which is used to ensure that it does not enter the tailings sand body outside the culvert during grouting in this annular wall gap.

[0050] Using leakage detection technology as a comparison, the data advantages of this invention are analyzed in detail, and the specific comparison table is as follows:

[0051] Table 2 Comparison of Leakage Detection Technology with Existing Technologies

[0052]

[0053] Based on Table 2 above, it can be concluded that compared with existing conventional leakage monitoring technologies, the leakage monitoring technology of this invention has significant advantages. First, it offers more precise scenario-based processing, developing differentiated solutions for the two core situations of "no overflow" and "still leaking," avoiding the drawbacks of the "one-size-fits-all" approach of conventional technologies. Second, it boasts stronger process standardization and controllability, with clear operational standards for each step from airbag sealing and concrete curing to staged grouting, and the introduction of auxiliary means such as camera observation and refined drilling tool processing to form a closed-loop management system. Third, it features a high degree of standardization of material and equipment parameters, clearly defining key indicators such as concrete strength, grout ratio, and pipeline specifications, solving the problems of vague parameters and reliance on experience in existing technologies. Fourth, it offers stricter precision control, effectively ensuring grouting quality and reducing residual leakage risks by limiting the grout consolidation range and using detailed measures such as cotton wedging.

[0054] S3, secondary leakage monitoring.

[0055] S31, No water below the airbag in the pipe: After pushing the other airbag of S22 to a certain distance, the outlet end of the culvert is sealed, and then the concrete is cured. Grouting is carried out through pipe 1. When the grouting of pipe 2 begins to return, switch to grouting through pipe 2. The sealing is completed when the grouting reaches the position of the other airbag.

[0056] S32, water flow still exists below the airbag in the pipe: After pushing the other airbag in S22 to a certain distance, add a drainage grouting pipe, then seal the outlet end and cure the concrete. Grout through pipe 1 under flowing water conditions. When grout begins to return from pipe 2, switch to grouting through pipe 2. When grout appears in the drainage grouting pipe, stop grouting through pipe 2. Finally, cure for 24 hours, during which time the drainage grouting pipe should be kept in normal drainage. When grouting is resumed through the drainage pipe to the position of the other airbag, the sealing is completed. The certain distance is 185m~195m. Inflate the rubber airbag according to the design inflation pressure. The diameter of the drainage grouting pipe is 75~85mm, and the length of the drainage grouting pipe is 185~190m. The end of the drainage grouting pipe away from the grouting port is shaped like a flower tube, and the length of the flower tube is 5~6m. The drainage grouting pipe adopts an adaptive drainage system, which includes a corrosion-resistant submersible pump set, a float level switch and an ultrasonic level gauge dual-mode monitoring unit, and an intelligent control cabinet with an integrated PLC controller. The adaptive drainage system automatically adjusts the start and stop frequency of the drainage pump according to the grout level change. The frequency adjustment is used to ensure that the water level in the culvert is maintained 30-50cm below the height of the airbag during the maintenance period.

[0057] Using secondary leakage monitoring technology as a comparison, the data advantages of this invention are analyzed in detail, and the specific comparison table is as follows:

[0058] Table 3 Comparison of Secondary Leakage Detection Technology with Existing Technologies

[0059]

[0060] Based on Table 3 above, it can be concluded that the secondary leakage monitoring technology overcomes the dependence of existing technologies on waterless / micro-seepage environments. Through the combined design of "dual airbags + adaptive drainage system," it achieves full coverage of both flowing water and waterless scenarios, solving the pain point of existing technologies requiring additional temporary drainage facilities under complex water flow conditions. The S3 technology designs differentiated construction processes for different water flow states, and combines the perforated pipe structure of the drainage grouting pipe to enhance grout collection capacity. Through the closed-loop operation of "grouting-drainage-re-grouting," it effectively avoids the grout leakage problem of existing technologies under flowing water conditions, improving the durability of the sealing.

[0061] Example 1, taking the construction of the walkway on the 982m platform as an example. A rubber airbag installed at the bottom of the overflow well maintains the design pressure during inflation, completely isolating the reservoir water from the culvert. This ensures no water flow within the culvert and maintains this state for at least 24 hours after the culvert filling and consolidation grouting is completed. The culvert at the bottom of the overflow well is sealed using the rubber airbag, completely isolating the reservoir water from the culvert. Two grouting pipelines, each with a diameter of 40-50mm, are introduced into the culvert from the outlet. One pipeline is approximately 5-10m long, and the other is 130-135m long, ensuring the grout outlet extends 30-35m beyond the culvert cavity formed by the borehole on the 982m platform. Subsequently, concrete is used to seal the culvert outlet. After the concrete has cured for 48-72 hours, single-component cement grout is injected into the culvert through grouting pipeline 1 and grouting pipeline 2, filling and consolidating the culvert to the originally designed 190m position.

[0062] Example 2, taking the construction of the walkway on the 982m platform as an example. By utilizing the combined water-blocking effect of two airbags installed at the bottom of the overflow well and 190m inside the culvert, ensuring no water leakage in the section of the culvert below 190m, rubber airbags are used to seal the bottom of the culvert at the overflow well. After partially or largely isolating the water in the reservoir from the hydraulic connection of the culvert, according to the original design, a drilling rig is used to send the rubber airbags as far as possible above the culvert outlet to a position 190m above the culvert outlet and inflates them according to the design pressure. If the leakage in the section of the culvert below the original design airbags completely disappears, two grouting pipelines with a diameter of 40-50mm welded steel pipes are directly introduced into the culvert from the outlet. One pipeline is approximately 5-10m long, and the other is 135m long, so that the grout outlet extends 30-35m beyond the culvert cavity formed by the borehole on the 982m platform. Subsequently, concrete is used to seal the culvert outlet. After the concrete has been cured for 48 to 72 hours, single-component cement grout is injected into the culvert through grouting pipe 1 and grouting pipe 2 to fill and solidify the culvert to the original design position of 190m.

[0063] Example 3, taking the construction of the walkway on the 982m platform as an example. When the site conditions do not meet the implementation conditions of Examples 1 and 2, rubber airbags are used to seal the bottom culvert of the No. 3 overflow well. After partially or mostly isolating the water in the reservoir from the hydraulic connection of the culvert, the rubber airbags are then driven as far as possible to a position 190m above the culvert outlet end using a drilling rig, and inflated according to the design inflation pressure, according to the original design plan. If leakage still exists in the culvert section below the original design airbag, the culvert cavity punctured by the borehole at the 982m platform will be effectively sealed using manual plugging methods. Then, the following will be introduced into the culvert from the outlet: one 40-50mm diameter, 5-10m long welded steel pipe grouting pipeline; one 40-50mm diameter, 135m long steel pipe grouting pipeline (with a filter outlet in section 130-135m); and one 80mm diameter, 188m long filter / grouting pipeline (with a perforated pipe in section 183-188m). The culvert outlet will then be sealed with concrete. After the concrete has cured for 48-72 hours, single-component cement grout will be injected into the culvert under flowing water conditions through grouting pipeline 1, grouting pipeline 2, or the filter pipeline to fill and solidify the culvert to the original design position of 190m.

[0064] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of plugging a culvert of an overflow well, characterized in that, Specifically comprises the following steps: S1, basic preparation: personnel into the overflow well, hand-held pick to remove the cement and water glass slurry stone body, while cleaning simultaneously using a submersible pump drainage, into the culvert outlet end to the culvert inside send grouting pipeline 1 and pipeline 2, check the rubber air bag section culvert state, artificial send rubber air bag to the bottom of the well culvert, inflate to the design pressure, stop wellbore drainage, observe the water level rise; S2, leakage monitoring; S21, culvert outlet end monitoring no overflow water: after the air bag inflation, close the outlet end of the culvert, then the concrete curing, through pipeline 1 grouting, when the grouting to the pipeline 2 outside port appears slurry overflow, close the pipeline 1 outside port valve, use grouting pipeline 2 grouting until the end of grouting; S22, culvert outlet end monitoring still exists leakage: arrange personnel into the culvert, cut off the drill into the pipe, then send camera to observe the culvert state, confirm the installation of air bag conditions, use the drill to push another air bag to a certain distance, finally inflate to the design pressure and keep stable; S3, secondary leakage monitoring; S31, pipe air bag below segment no water: push another air bag to a certain distance after S22, close the culvert outlet end, then the concrete curing, through pipeline 1 grouting, when the pipeline 2 begins to return slurry, switch to pipeline 2 grouting, complete the plugging when grouting to another air bag position; S32, pipe air bag below segment still exists water flow: push another air bag to a certain distance after S22, increase 1 drainage grouting pipe, then close the outlet end, and the concrete curing, under the condition of moving water through pipeline 1 grouting, when the pipeline 2 begins to return slurry, switch to pipeline 2 grouting, when the drainage grouting pipe appears slurry, terminate the pipeline 2 grouting, finally curing for 24 hours, keep the drainage grouting pipe normal drainage during the curing period, restore grouting through the drainage pipe to another air bag position to complete the plugging.

2. A method of plugging a culvert of an overflow well as claimed in claim 1, characterized in that: In step S1, before removing the well bottom cement and water glass slurry stone body, install water pump to drain the water in the well, the air supply pipeline used in the process of pick uses suitable steel wire rope suspension and is fixed firmly on the ground, the illumination device with illumination voltage of 36v is arranged in advance in the overflow well, the personnel wears safety belt before entering the overflow well, and the safety belt is made of nylon fiber rope and is fixed firmly on the ground, the rubber air bag needs to be avoided during the process of lowering and installing.

3. A method of plugging a culvert of an overflow well as claimed in claim 1, wherein: In step S21, the diameter of pipeline 1 and pipeline 2 is 40-50mm, the length of pipeline 1 is 5-10m, the length of pipeline 2 is 130-135m, the curing time of concrete curing is 48-72 hours, pipeline 1 and pipeline 2 are connected in the form of inner joint, and the inner joint is connected with pipeline 1 and pipeline 2 in the form of thread.

4. A method of plugging a culvert of an overflow well as claimed in claim 3, wherein: The strength grade of the concrete is C20, the concrete is added with appropriate amount of concrete early strength agent during production, the grouting slurry type is single-liquid cement slurry, the water-cement ratio of the single-liquid cement slurry is 0.75-1:1, the cement is selected from fresh P.O42.5 grade ordinary portland cement without agglomeration, the mixing time of the cement slurry is higher than 3 min, and the slurry rock mass needs to be consolidated to the position of 185 m-195 m of the culvert.

5. A method of plugging a culvert of an overflow well as claimed in claim 4, wherein: In step S22, the distance is 185 m-195 m, after the drilling tool cutting is completed, the steel flat drill is used to clean the gap between the pipe wall and the drilling tool ring wall, after the cleaning is completed, the artificial wedge method is used to wedge cotton into the gap between the ring wall, the cotton is wedged tightly by using a wooden wedge, and the cotton wedging is used to ensure that the gap between the ring wall does not enter the tail sand body outside the culvert during grouting.

6. A method of plugging a culvert of an overflow well as claimed in claim 5, wherein: In step S3, the distance is 185 m-195 m, and the rubber air bag is inflated according to the design inflation pressure.

7. A method of plugging a culvert of an overflow well as defined in claim 1, characterized in that: The integrated intelligent monitoring module is arranged in the pipeline 1 and the pipeline 2, the integrated intelligent monitoring module includes a pressure sensor array, an electromagnetic flowmeter and a wireless data transmission module, the pressure sensor is arranged along the pipeline axial direction at intervals for real-time acquisition of grouting pressure data, the flow monitoring unit accurately measures the instantaneous flow of the slurry by using the electromagnetic flowmeter, and the wireless module transmits the pressure and flow data to the ground control center in real time.

8. A method of plugging a culvert of an overflow well as claimed in claim 7, characterized in that: In step S32, the drain grouting pipe has a diameter of 75-85 mm, the length of the drain grouting pipe is 185-190 m, the drain grouting pipe is in a flower pipe shape away from the grouting port end, the length of the flower pipe shape is 5-6 m, the drain grouting pipe adopts a self-adaptive drainage system, the self-adaptive drainage system includes a corrosion-resistant submersible pump group, a floating ball liquid level switch and an ultrasonic liquid level meter double-mode monitoring unit, and an intelligent control cabinet integrated with a PLC controller, the self-adaptive drainage system automatically adjusts the start-stop frequency of the drainage pump according to the slurry level change, and the adjustment frequency is used to ensure that the water level in the culvert is maintained below 30-50 cm of the air bag height during maintenance.

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