Rail transit steel spring ballast bed hidden water leakage detection and treatment method

Abstract

The invention provides a detection and treatment method for water leakage of a rail transit steel spring ballast bed. The detection method for the water leakage of the rail transit steel spring ballast bed comprises the steps that partition flow monitoring is conducted on a steel spring ballast bed drainage system, and a potential leakage area is positioned; the spatial position of a leakage point is detected through electromagnetic wave reflection characteristics; and an endoscope system is adopted for visual verification. The treatment method for the leakage water of the rail transit steel spring ballast bed comprises the steps that the leakage grade is obtained on the basis of the method, and grouting treatment is carried out.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of leakage detection and treatment of rail transit facilities, and in particular to a method for detecting and treating hidden leakage of rail transit steel spring track bed. BACKGROUND

[0002] Steel spring floating slab track bed, as a high-efficiency vibration reduction structure, is widely used in subway lines, especially in lines with high vibration control requirements. With the continuous development of urban rail transit, the subway network is becoming increasingly large, and the application range of this high-efficiency vibration reduction structure is also continuously expanding. It can effectively isolate train operation vibration, provide passengers with a more comfortable ride environment, and also help reduce the impact on the surrounding environment. However, with the continuous rise of groundwater level, the leakage problem of subway steel spring track bed has gradually emerged. Leakage not only causes damage to the track bed structure and related equipment, but also affects the safe operation of the subway, becoming a problem that needs to be solved in the field of rail transit. SUMMARY

[0003] Therefore, the present disclosure provides a method for detecting leakage of rail transit steel spring track bed, which includes: partitioning flow monitoring to locate potential leakage areas for the steel spring track bed drainage system; detecting the spatial position of the leakage point through electromagnetic wave reflection characteristics; and using an endoscope system for visual verification.

[0004] According to an embodiment of the present disclosure, the partitioning flow monitoring to locate includes: measuring the instantaneous flow of adjacent drainage observation holes, and when the flow change of adjacent holes exceeds 20% and external interference is excluded, determining that the interval is a potential leakage area.

[0005] According to an embodiment of the present disclosure, the detecting the spatial position of the leakage point through electromagnetic wave reflection characteristics includes: using electromagnetic wave antennas of different frequencies to scan the track bed structure layer by layer to obtain reflected electromagnetic waves; and identifying the leakage point based on the intensity change and wavelength characteristics of the reflected electromagnetic waves.

[0006] According to an embodiment of the present disclosure, the above method further includes: setting the antenna frequency parameters according to the track bed structure design drawings, the scanning speed is 200-300 tracks per second, and the time window range is 40-60 ns.

[0007] According to an embodiment of the present disclosure, the visual verification using the endoscope system includes: extending the probe of the endoscope into the drainage ditch inside the steel spring track bed, recording the state of the leakage point, and determining the leakage level.

[0008] According to an embodiment of another aspect of the present disclosure, a method for treating leakage of rail transit steel spring track bed is provided, which includes: based on the leakage level obtained by using the method as described above, implementing grouting treatment.

[0009] According to embodiments of this disclosure, grouting treatment includes: selecting grouting materials according to the leakage level, using a segmented grouting process to advance from the periphery of the leakage to the center, and grouting pressure of 0.2-0.5 MPa.

[0010] According to embodiments of this disclosure, the grouting materials include epoxy resin materials, acrylate materials, and polyurethane materials.

[0011] According to embodiments of this disclosure, epoxy resin materials include any one of glycidyl ether epoxy resin, glycidyl ester epoxy resin, glycidyl amine epoxy resin, linear aliphatic epoxy resin, and alicyclic epoxy resin; acrylate materials include any one of acrylate grouting liquid and cement-acrylate composite material.

[0012] According to embodiments of this disclosure, multiple grouting holes are evenly distributed on the steel spring track bed, and the distance between each grouting hole and the leakage section is 1500-2000 mm.

[0013] According to embodiments of this disclosure, leak points can be precisely located through combined detection (positioning error ≤3cm), and combined with graded grouting treatment, the water flow path can be quickly blocked, preventing continuous corrosion of the steel structure by leaks. Actual engineering data shows that after adopting this technology, the service life of steel spring vibration isolators can be extended by 5-8 years, and the incidence of track bed structural defects can be reduced by more than 60%, fundamentally ensuring the safe operation of subway lines. Through the "precise positioning-graded treatment" model, the amount of grouting material used can be reduced by 30%-50%; at the same time, the detection process shortens the leak point investigation time from the traditional 7-10 days to 2-3 days, and the treatment period for a single section is shortened by more than 60%. Deeply integrating technologies such as ground-penetrating radar and endoscopy with engineering practice, and combining leak level classification standards with grouting material matching systems, provides quantifiable and replicable technical specifications, solving the long-standing problem of "unable to assess and trace" treatment effects. The above technical solution offers high positioning accuracy. By combining zoned flow monitoring, electromagnetic wave detection, and endoscopic verification in a three-level combination mode, it overcomes the limitations of single methods, achieving a leakage point positioning error of ≤3cm. The treatment is highly targeted, selecting appropriate grouting materials based on the leakage level, and using a segmented grouting process to avoid structural damage, thus improving treatment efficiency by over 40%. The effect is verifiable; comparison of electromagnetic wave detection before and after grouting allows for quantitative evaluation of the treatment effect, improving the efficiency of water leakage treatment in steel spring track beds and avoiding indiscriminate treatment. Attached Figure Description

[0014] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0015] Figure 1 This is a schematic cross-sectional view of a steel spring track bed according to an embodiment of the present disclosure;

[0016] Figure 2 This is a top view of a steel spring track bed according to an embodiment of this disclosure.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Grouting hole; 2. Leakage section. Detailed Implementation

[0019] To make the objectives, technical solutions and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0020] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0021] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0022] When using expressions such as "at least one of A, B, and C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0023] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this disclosure.

[0024] Currently, the detection and remediation of water leakage in steel spring track beds typically employ either ground-penetrating radar (GPR) detection or traditional manual inspection methods. GPR utilizes the propagation characteristics of electromagnetic waves in different media to detect underground targets and has certain applications in geological structure exploration and engineering inspection. However, in the special structure of steel spring track beds, the presence of numerous metal components makes GPR detection susceptible to shielding effects, leading to misjudgments. Traditional manual inspection relies on direct observation and judgment. While it may detect some obvious leakage points, the presence of air gaps in the lower part of the steel spring track bed, and the fact that leakage points are often hidden within the structure, prevents manual inspection from reaching these cavities and thus hinders the discovery of concealed leakage points. These conventional methods suffer from limitations in their versatility and cannot fully cover the concealment and complexity of leakage points. The unique structural design of steel spring track beds, such as the air gaps, creates physical barriers that geophysical waves cannot penetrate, making conventional geophysical methods ineffective in detecting deep leakage points. Furthermore, the use of concealed drainage ditches makes it impossible to directly observe changes in drainage volume to analyze leakage locations, further increasing the difficulty of detection. Single detection methods are insufficient to address the complex leakage situations in steel spring track beds, resulting in low accuracy in locating leakage points and poor targeted treatment, failing to meet the needs of practical engineering projects. Therefore, this disclosure proposes a method for detecting and treating leakage in steel spring track beds.

[0025] Specifically, this disclosure provides a method for detecting water leakage in steel spring track beds for rail transit, including: performing zoned flow monitoring of the steel spring track bed drainage system to locate potential leakage areas; detecting the spatial location of leakage points through electromagnetic wave reflection characteristics; and using an endoscope system for visual verification.

[0026] By adopting the above technical solutions, the limitations of single detection methods are overcome, and the leakage points are accurately located. The treatment is highly targeted and efficient, and the treatment effect can be quantitatively evaluated. It is applicable to steel spring track beds with different construction methods, which improves the safety of rail transit operation, reduces the maintenance cost throughout the entire life cycle, and promotes the upgrading of rail transit maintenance technology.

[0027] According to embodiments of this disclosure, zoned flow monitoring and location includes: measuring the instantaneous flow rate of adjacent drainage observation holes; when the flow rate change of adjacent holes exceeds 20%, and external interference is excluded, the zone is determined to be a potential leakage area. Further, the instantaneous flow rate is calculated using the formula Q=A×v, where A is the cross-sectional area of ​​the drainage ditch and v is the flow velocity.

[0028] By measuring and calculating the instantaneous flow rate of adjacent drainage observation holes, and determining the potential leakage area based on the sudden changes in flow rate at adjacent holes, the leakage range can be preliminarily delineated, providing a target for subsequent precise detection. This overcomes the problem that traditional detection methods cannot fully cover the concealment and complexity of leakage points, and improves the accuracy of leakage point location.

[0029] According to embodiments of this disclosure, detecting the spatial location of a leak point by means of electromagnetic wave reflection characteristics includes: using electromagnetic wave antennas of different frequencies to scan the track bed structure layer by layer to obtain reflected electromagnetic waves; and identifying the leak point based on the intensity change and wavelength characteristics of the reflected electromagnetic waves. Further, using electromagnetic wave antennas of different frequencies to scan the track bed structure layer by layer, high-frequency antennas are used for shallow, high-precision detection, and low-frequency antennas are used for deep, penetrating detection; the leak point is identified by analyzing the intensity change and wavelength characteristics of the reflected electromagnetic waves.

[0030] The above technical solution involves zoned flow monitoring to locate potential leakage areas in the drainage system of steel spring track beds. Electromagnetic wave antennas of different frequencies are then used to scan the track bed structure layer by layer. High-frequency antennas are used for shallow, high-precision detection, while low-frequency antennas are used for deep, penetrating detection. The changes in electromagnetic wave reflection intensity and wavelength characteristics are analyzed to identify leakage points. An endoscope system is then used for visual verification. Based on the leakage level, corresponding types of grouting treatment are implemented. The treatment effect is verified through electromagnetic wave detection comparison. This approach overcomes the limitations of single methods, achieves precise location of leakage points, and effectively solves the problems of strong concealment and difficulty in locating leakage points within the enclosed structure of steel spring track beds.

[0031] According to embodiments of this disclosure, the method further includes: setting antenna frequency parameters based on the track bed structure design drawings, with a scanning speed of 200-300 channels / second and a time window range of 40-60 ns. Preferably, the scanning speed is 256 channels / second, and the data excitation path is controlled by a ranging wheel during measurement.

[0032] By using the above technical solutions and setting the antenna frequency parameters according to the track bed structure design drawings, more accurate detection can be achieved by combining the thickness of each layer of the track bed and the position of the components; controlling the scanning speed at 256 tracks / second can ensure the speed and quality of data acquisition; setting the time window range to 40-60ns can adapt to different detection depth requirements; controlling the data excitation path through the ranging wheel can ensure the accuracy of the data acquisition path, thereby improving the accuracy and reliability of electromagnetic wave detection of leakage points, and helping to more accurately locate the hidden leakage points of steel spring track beds in rail transit.

[0033] According to embodiments of this disclosure, visualization verification using an endoscopic system includes: inserting the endoscope probe into the drainage ditch of the steel spring track bed, recording the state of the leakage points, and determining the leakage level. Further, a high-definition probe with 360° horizontal rotation and 180° vertical rotation capabilities is inserted into the track bed drainage ditch to record the water flow pattern, wetting marks, and component condition at the leakage points, and thereby determine the leakage level.

[0034] The above technical solution involves inserting a high-definition probe with a specific rotation function into the drainage ditch of the track bed. This allows for the recording of water flow patterns, wetting marks, and component conditions at leakage points, thereby determining the leakage level and enabling visual verification of suspected leakage points. This overcomes the limitation of radar being susceptible to interference from metal components, achieving cross-verification of geophysical data and visual evidence, and providing a basis for subsequent targeted grouting treatment.

[0035] According to another embodiment of this disclosure, a method for treating water leakage in a steel spring track bed for rail transit is provided, comprising: grouting treatment based on the leakage level obtained using the method described above. Further, the leakage level determination includes: dry stains: cracks on the structural surface, damp spots disappear after ventilation, leaving marks; wet stains: damp spots do not disappear, dripping frequency < 1 drop / min, leakage volume < 0.1 L / d; dripping: 1 drop / min < dripping frequency < 300 drops / min, 0.1 L / d ≤ leakage volume ≤ 20 L / d; linear flow: leakage in a linear pattern, 20 L / d < leakage volume ≤ 1000 L / d; stream flow: continuous stream flow, 1000 L / d < leakage volume ≤ 10000 L / d; and gushing flow: spraying or gushing water, leakage volume > 10000 L / d. These correspond to different water conditions and leakage volume standards, serving as the basis for selecting grouting materials.

[0036] According to embodiments of this disclosure, grouting treatment includes: selecting grouting materials according to the leakage level, using a segmented grouting process to advance from the periphery of the leakage to the center, and grouting pressure of 0.2-0.5 MPa.

[0037] According to embodiments of this disclosure, the grouting materials include epoxy resin materials, acrylate materials, and polyurethane materials. Further, for minor leaks (dry or wet), penetrating grouting liquids such as epoxy resin materials are used to penetrate and seal tiny cracks; for moderate leaks (dripping or linear flow), gel-type grouting liquids such as acrylate materials are used to quickly form a gel to block water flow; for severe leaks (surges or gushing flows), quick-setting grouting liquids such as polyurethane materials are used to rapidly solidify and stop the water.

[0038] The above technical solution classifies leakage levels into six categories, corresponding to different water body conditions and leakage volume standards, providing a basis for the selection of grouting materials. This allows for the selection of appropriate grouting materials based on the leakage level, avoiding material waste or incomplete treatment caused by traditional methods, making the treatment more targeted and improving efficiency.

[0039] According to embodiments of this disclosure, epoxy resin materials include any one of glycidyl ether epoxy resin, glycidyl ester epoxy resin, glycidyl amine epoxy resin, linear aliphatic epoxy resin, and alicyclic epoxy resin; acrylate materials include any one of acrylate grouting liquid and cement-acrylate composite material.

[0040] Figure 1 This is a schematic cross-sectional view of a steel spring track bed according to an embodiment of this disclosure. Figure 2 This is a top view of a steel spring track bed according to an embodiment of this disclosure.

[0041] According to embodiments of this disclosure, such as Figures 1-2 As shown, multiple grouting holes 1 are evenly distributed on the steel spring track bed. The distance between each grouting hole 1 and the leakage section 2 is 1500-2000 mm, for example, it can be 1600, 1700, 1800 and 1900 mm.

[0042] According to embodiments of this disclosure, the above method further includes: after grouting treatment, repeating electromagnetic wave detection and comparing waveform characteristics before and after grouting; if the abnormal water content signal attenuates, the treatment is deemed effective.

[0043] Through the aforementioned technical solution, concealed water leakage in rail transit steel spring track beds is monitored by zoned flow rate, electromagnetic wave detection, and endoscopic verification. Based on the leakage level, corresponding types of grouting treatment are implemented. Electromagnetic wave detection is repeated after a preset time following grouting completion, and the waveform characteristics before and after grouting are compared. If the signal attenuation is abnormal due to water content, the treatment is deemed effective, achieving a quantitative assessment of the treatment effect, ensuring that leakage channels are effectively sealed, and guaranteeing treatment quality. Furthermore, this method has broad applicability and can be used for steel spring track bed structures constructed using various methods such as cut-and-cover and shield tunneling. Simultaneously, by densifying the detection layout of the track bed top surface survey lines and covering construction joints and expansion joints with the side wall survey lines, a more comprehensive detection and treatment of leakage points can be achieved.

[0044] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A method for detecting water leakage in a rail transit steel spring track bed, comprising: The steel spring ballast drainage system is monitored by partition flow to locate potential leakage area; The spatial position of the leakage point is detected by electromagnetic wave reflection characteristics; Endoscope system is used for visual verification.

2. The method of claim 1, wherein, The partition flow monitoring and positioning includes measuring the instantaneous flow of adjacent drainage observation holes, and when the flow of adjacent holes changes by more than 20% and external interference is excluded, the interval is determined as a potential leakage area.

3. The method of claim 1, wherein, The spatial position of the leakage point is detected by electromagnetic wave reflection characteristics, including using electromagnetic wave antennas of different frequencies to scan the ballast structure layer by layer to obtain reflected electromagnetic waves; and identifying the leakage point based on the reflected electromagnetic wave intensity change and wavelength characteristics.

4. The method of claim 3, wherein, Further comprising: The antenna frequency parameters are set according to the ballast structure design drawings, the scanning speed is 200-300 channels per second, and the time window range is 40-60 ns.

5. The method of claim 1, wherein, The visual verification using the endoscope system includes extending the probe of the endoscope into the drainage ditch inside the steel spring ballast, recording the state of the leakage point and determining the leakage grade.

6. A method for treating water leakage of a rail transit steel spring ballast bed, comprising: Based on the leakage grade obtained by the method of any one of claims 1-5, grouting treatment is implemented.

7. The method of claim 6, wherein, The grouting treatment includes selecting grouting materials according to the leakage grade, advancing from the periphery to the center through multiple grouting holes, and the grouting pressure is 0.2-0.5 MPa.

8. The method of claim 7, wherein, The grouting materials include epoxy resin materials, acrylic salt materials, and polyurethane materials.

9. The method of claim 8, wherein, The epoxy resin materials include any one of glycidyl ether epoxy resin, glycidyl ester epoxy resin, glycidyl amine epoxy resin, linear aliphatic epoxy resin, and alicyclic epoxy resin; the acrylic salt materials include any one of acrylic salt grouting fluid and cement-acrylic salt composite material.

10. The method of claim 7, wherein, The multiple grouting holes are uniformly distributed on the steel spring ballast, and the distance between each grouting hole and the leakage cross section is 1500-2000 mm.

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