Treatment methods for defects in the integral track bed of existing linear elastic short sleepers under time and space constraints

Abstract

This invention relates to the field of track bed defect treatment technology for rail transit, and discloses a method for treating integral track bed defects of existing lines with flexible short sleepers under time and space constraints. The method includes the following steps: drilling downwards at an angle on both sides of the track bed surface of the flexible short sleeper, forming an angle of less than 90° between the holes and the elastic short sleeper; embedding metal injection needles in the holes; temporarily sealing the contact point between the flexible short sleeper and the track bed, and leaving vent holes; injecting polymer injection material through the holes under pressure into the gap between the flexible short sleeper, rubber boots, and the track bed; when polymer injection material overflows from the vent holes, the injection work is complete; after the polymer injection material has solidified, sealing the injection holes and removing the temporary sealing material from the flexible short sleeper. This method can quickly and efficiently solve problems such as gaps and empty suspension in the integral track bed of the flexible short sleeper without affecting the normal operation of the line.

Description

Technical Field

[0001] This invention relates to the field of track bed defect treatment technology, and in particular to a method for treating integral track bed defects of existing lines with elastic short sleepers under time and space constraints. Background Technology

[0002] The flexible short sleeper integral track bed mainly consists of reinforced concrete track bed, rubber boots and rubber pads under the sleepers, and reinforced concrete short sleepers. The vertical elasticity of this track structure is mainly provided by the rubber pads under the sleepers, classifying it as a medium-vibration-damping track bed. Due to its good vibration reduction effect and low construction cost, the flexible short sleeper integral track bed was widely used in early-stage rail transit lines.

[0003] In recent years, with the increase in operating mileage and time, the track bed of the flexible short sleeper has been continuously impacted by trains, gradually revealing problems such as aging and deformation of the rubber boots, sleeper gaps, gauge changes, and reduced vibration damping effect. If these problems continue to develop, they will seriously affect the geometry and stability of the track, thereby endangering operational safety. The gaps between the flexible short sleepers and the track bed are complex, ranging from less than 1mm to more than 10mm, and are uneven. These gaps are mixed with dust, concrete debris, water, and other impurities, and the upper part of the gaps is mostly covered by the caps of the flexible short sleepers, making them difficult to manage. Currently, two main methods are used to address this: one is through track replacement, where the aging rubber boots and short sleepers are completely removed and replaced with new concrete short sleepers and fasteners, and the track bed is restored by pouring concrete. The other is to replace only the elastic boots, replacing the existing elastic boots with high-polymer damping materials. Although these two methods can fundamentally solve the problems of the flexible short sleeper track bed, they have many inherent challenges. First, the construction process involves numerous steps, complex laying equipment, and intricate construction techniques. Second, due to the short maintenance window period for existing lines, the overall renovation work places extremely stringent time controls on each step. Existing renovation methods, while ensuring no disruption to existing line operations, are slow and ill-suited for treating large-scale elastic short sleeper defects. Third, due to the short treatment time, existing filling materials cannot achieve sufficient compressive strength in a short period. Fourth, because the treatment area has small gaps, the compressive strength and modulus of elasticity of the cured filling material must not only ensure the support strength for the track and promote structural stability but also ensure the track's geometric alignment to prevent derailment. Flexibility is crucial to prevent brittleness or fracture after curing, thus avoiding secondary damage to the elastic short sleepers.

[0004] To accelerate the treatment of defects in existing flexible short sleepers, improve track foundation conditions, and avoid potential safety hazards, it is urgent to explore innovative solutions by combining the application of new materials, processes, and technologies to meet the needs of treating large-scale defects in flexible short sleepers. Therefore, given the numerous deficiencies and shortcomings in existing construction materials, processes, and efficiency, this invention proposes a method for treating defects in the integral track bed of flexible short sleepers. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for treating defects in the integral track bed of existing railway lines under time and space constraints. This method can quickly and efficiently resolve issues such as gaps and empty sections in the integral track bed of elastic short sleepers without affecting normal line operation. This method satisfies both the quality requirements of the grouting process and effectively improves construction efficiency, minimizing the impact on the operation of existing lines.

[0006] This invention provides a method for treating defects in the integral track bed of existing linear elastic short sleepers under time and space constraints, comprising the following steps:

[0007] S1: Drill holes at an angle downwards on the track bed on both sides of the elastic short sleeper, so that the holes form an angle of less than 90° with the elastic short sleeper.

[0008] S2: A metal injection needle is embedded in the duct;

[0009] S3: Temporarily seal the contact point between the flexible short sleeper and the track bed surface, and leave vent holes;

[0010] S4: Under pressure, the polymer injection material is injected through the channel of S1 into the gap between the elastic short sleeper, rubber boot and track bed. When polymer injection material overflows from the vent hole, it indicates that the injection work is completed.

[0011] S5: After the polymer injection material has cured, seal the injection hole and remove the temporary sealing material of the elastic short sleeper in S3.

[0012] Furthermore, in S1, during the drilling operation, the hole needs to penetrate the track bed and the rubber boot, and the hole connects the gap between the elastic short sleeper, the rubber boot and the track bed.

[0013] Furthermore, the pressure in S4 is greater than 0 MPa and not greater than 4 MPa.

[0014] Furthermore, the diameter of the channel is 0.8cm-1.2cm.

[0015] Furthermore, the polymer infusion material is a polymer infusion material with a compressive strength of 50MPa-70MPa after curing, an elastic modulus of 149MPa-297MPa, and a flow spread of not less than 350mm.

[0016] Furthermore, the polymer infusion material includes acid anhydride compounds, alcohols, dispersants, and curing agents.

[0017] Furthermore, by mass, the ratio of the acid anhydride compound, alcohol, dispersant, and curing agent is 1 part : (0.35 parts - 5.5 parts ): (0.035 parts - 0.205 parts ): (0.005 parts - 0.02 parts).

[0018] Furthermore, the acid anhydride compounds include one or more of maleic anhydride, polymaleic anhydride, cyclohexanediol anhydride, phthalic anhydride, ethyl propionic anhydride, and acetic propionic anhydride.

[0019] Furthermore, the alcohols include one or more of methanol, polymethanol, polyvinyl alcohol, polyethylene glycol, polypropylene glycol, polyethylene adipate, and polybutylene succinate.

[0020] Furthermore, the dispersant includes one or more of dichloromethane, trichloromethane, tetrachloromethane, styrene, stilbene, DMF (dimethylformamide), and DMA (dimethylacetamide).

[0021] Furthermore, the curing agent includes one or more of aliphatic amines, cycloaliphatic amines, aromatic amines, polyamides, and polyether amines.

[0022] Furthermore, the polymer infusion material comprises maleic anhydride, polyethylene adipate, stilbene, and fatty amine, wherein the ratio of maleic anhydride, polyethylene adipate, stilbene, and fatty amine by mass is 1:4:0.15:0.01.

[0023] Furthermore, the time from the injection of the polymer injection material to its curing is ≤30 minutes, and the time for the compressive strength of the cured polymer injection material to reach 50% of the compressive strength of the fully cured polymer injection material is ≤1.5 hours.

[0024] This invention also provides the application of the method for treating defects in the integral track bed of existing linear elastic short sleepers under time and space constraints in the treatment of track bed defects.

[0025] The embodiments of the present invention have the following technical effects:

[0026] 1. In this invention, the drilling operation is performed obliquely downwards from both sides of the track bed surface of the elastic short sleeper. Firstly, this improves the efficiency of the treatment process. Secondly, while still achieving the treatment, the resulting treatment channel is smaller, reducing the impact of the treatment process on the overall structure of the elastic short sleeper. Thirdly, the formation of the treatment channel facilitates the complete entry of the polymer injection material into the elastic short sleeper. During the treatment process, a polymer injection material with a cured compressive strength of 50MPa-70MPa and an elastic modulus of 149MPa-297MPa is further selected. This material not only allows for treatment of defects through a smaller treatment channel within narrow gaps, but also enhances the supporting strength and reduces cracking after curing due to its increased compressive strength and elastic modulus. Since both the drilling-formed channels and track bed defects are narrow spatial environments, the polymer injection material in this invention also has good fluidity. Furthermore, by controlling the pressure during the injection process, not only can the polymer injection material flow to the track bed defects, but it can also fully fill the track bed defects, avoiding unfilled gaps at the defects.

[0027] 2. The proposed method for treating defects in the integrated track bed using elastic short sleepers eliminates the need to remove the elastic short sleepers. Instead, it requires drilling small holes (1cm in diameter) into the track bed and injecting polymer material through metal injection needles. This addresses issues such as poor fit between the sleeper and the track bed, and gaps around the elastic sleeves during vertical sleeper movement. Compared to existing modification processes, this method effectively reduces interference with the existing track structure, reduces construction steps, simplifies the process, and speeds up construction.

[0028] 3. This invention proposes the use of a high-fluidity polymer injection material, which has the advantages of high strength, strong adhesion, good fluidity, short setting time, and high durability; it can effectively balance the setting speed and construction efficiency, so that it will not fail to meet the injection operation requirements due to rapid setting, nor will it affect normal operation due to slow setting.

[0029] 4. The method for treating defects in the integral track bed with elastic short sleepers proposed in this invention has lower construction costs and saves about 80% of the project cost compared with the existing method of removing all rubber boots and short sleepers with elastic short sleepers, replacing them with new concrete short sleepers and fasteners and pouring concrete to restore the integral track bed. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the integral track bed with flexible short sleepers provided in the embodiment;

[0032] Figure 2 This is a schematic diagram of the joint gap and empty suspension defects of the integral track bed with elastic short sleepers provided in the embodiment;

[0033] Figure 3 This is a schematic diagram of the drilling operation in the method for treating defects in the integral track bed of the elastic short sleeper provided in the embodiment;

[0034] Figure 4 This is a top view of the reserved vent location in the method for treating defects in the integral track bed with flexible short sleepers provided in the embodiment;

[0035] Figure 5 This is a schematic diagram showing the location of the embedded metal injection needles in the method for treating defects in the integral track bed using elastic short sleepers provided in the embodiment; wherein... Figure 5 In the middle 'a', a metal injection needle is embedded. Figure 5 Figure b is a top view of the embedded metal injection needle;

[0036] Figure 6 This is a schematic diagram of pressurized grouting for the treatment of defects in the integral track bed using elastic short sleepers provided in the embodiment.

[0037] In the diagram, 1-rail; 2-fastener; 3-elastic short sleeper; 4-rubber boot; 5-elastic pad; 6-track bed; 7-vent hole; 8-defect; 9-sealing material; 10-metal injection needle. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0039] In a first aspect, some embodiments of the present invention provide a method for treating defects in the integral track bed of existing linear elastic short sleepers under time- and space-constrained conditions, comprising the following steps:

[0040] S1: Drill holes at an angle downwards on the track bed on both sides of the elastic short sleeper, so that the holes form an angle of less than 90° with the elastic short sleeper.

[0041] S2: A metal injection needle is embedded in the duct;

[0042] S3: Temporarily seal the contact point between the flexible short sleeper and the track bed surface, and leave vent holes;

[0043] S4: Under pressure, the polymer injection material is injected through the channel of S1 into the gap between the elastic short sleeper, rubber boot and track bed. When polymer injection material overflows from the vent hole, it indicates that the injection work is completed.

[0044] S5: After the polymer injection material has cured, seal the injection hole and remove the temporary sealing material of the elastic short sleeper in S3.

[0045] The method for treating defects in the integral track bed with elastic short sleepers proposed in this invention can be completed during nighttime track maintenance windows, ensuring that the normal operation of the line is not affected. At the same time, this method has virtually no impact on subsequent maintenance and renovation, providing an effective guarantee for the long-term stability and safety of the track.

[0046] The construction process of the present invention does not require the removal of the elastic short sleepers. Instead, it only requires filling the gap between the elastic short sleepers and the track bed through the formed channels, thereby reducing interference with the existing track structure.

[0047] The method of this invention, apart from drilling small holes with a diameter of 1 cm, does not negatively impact the existing track structure throughout the entire construction process. Because the polymer injection material used has high fluidity, it can smoothly flow through the channels to the damaged area. During construction, under relatively low pressure, the polymer injection material can not only fully fill the damaged area, but also avoid damaging the elastic short sleeper track structure or adversely affecting the existing track geometry, thus ensuring train safety.

[0048] In this invention, the prepared polymer injection material is not only applicable to the method of this invention, but can also flow in the formed channels (meeting the injection requirements for gaps with a diameter of less than 1 mm), thereby realizing the filling of the defect area with polymer injection material; in addition, the polymer injection material of this invention is also applicable to the treatment of defects in the overall track bed of elastic short sleepers. After curing, the polymer injection material has good compressive strength and elastic modulus, so that the treated elastic short sleepers have good support strength and reduce the occurrence of cracks.

[0049] The method of this invention will not affect the replacement of the elastic track shoes later. When the elastic track shoes age further, resulting in loss of vibration damping performance or inability to meet the vibration damping requirements along the line, improvements can be made by replacing the elastic track shoes and elastic short sleepers with ordinary short sleepers and adding vibration damping fasteners. This flexible modification scheme provides more options for subsequent maintenance and optimization.

[0050] The proposed method for treating defects in integral track beds using flexible short sleepers requires simple construction machinery and significantly improves construction efficiency. Specifically, this method primarily employs manual labor in conjunction with small machinery, greatly enhancing operational flexibility and adaptability, and enabling it to cope with different construction environments and conditions.

[0051] The proposed method for treating defects in integral track beds using flexible short sleepers has a low engineering cost. This invention provides a more economical and feasible solution for treating defects in integral track beds using flexible short sleepers, effectively reducing project budgets.

[0052] In some embodiments, during the drilling operation in S1, the hole needs to penetrate the track bed and the rubber boot, and the hole connects the gap between the elastic short sleeper, the rubber boot and the track bed.

[0053] In this invention, the drilling operation is to connect the gaps between the sleeper, track shoe, and track bed through the hole, so that when filling with polymer injection material, the polymer injection material can be fully filled into the defect, thereby achieving effective treatment of the defect.

[0054] In some embodiments, the pressure in S4 is greater than 0 MPa and not greater than 4 MPa.

[0055] In this invention, by controlling the pressure and the flowability of the polymer injection material, not only can the polymer injection material flow to the defects in the track bed, but it can also fully fill the defects in the track bed.

[0056] In some embodiments, the diameter of the channel is 0.8cm-1.2cm.

[0057] In some embodiments, the polymer infusion material is a polymer infusion material with a compressive strength of 50MPa-70MPa after curing, an elastic modulus of 149MPa-297MPa, and a flow spread of not less than 350mm.

[0058] The polymer injection material obtained by this invention has good fluidity and the setting time of the polymer injection material of this invention can be controlled. It has a suitable working time in construction and can effectively balance the setting speed and construction efficiency. It will not fail to meet the injection operation requirements due to rapid setting, nor will it affect normal operation due to slow setting.

[0059] The polymer grouting material exhibits superior adhesion to the concrete structure and rubber boots at the contact points, significantly improving the overall integration of the polymer grouting material with the track bed structure and effectively reducing the risks of gaps and voids caused by temperature changes or mechanical vibrations.

[0060] Polymer injection materials can cure at damp interfaces. Furthermore, because the density of the repair material is greater than that of water, if the interface to be repaired is damp, the water will be drained out before the repair material is applied during the injection process.

[0061] The polymer injection material has a stable curing effect, which can ensure durability and consistency under various environmental conditions, and ensure that the sealant is not affected by external factors during long-term use, thereby improving the durability and reliability of the overall structure.

[0062] The polymer injection material has good adhesion to concrete and rubber boots. After peeling off the bonding part with the rubber boot, the failure interface is at the rubber boot, and there is no uncured adhesion.

[0063] In some embodiments, the polymer infusion material includes anhydride compounds, alcohols, dispersants, and curing agents.

[0064] In the polymer infusion material of this invention, a relatively closed treatment environment is formed through the method of this invention. In this closed environment, the lack of oxygen may further promote the polymerization reaction of acid anhydrides, while alcohols can interact with acid anhydrides through hydrogen bonds, affecting the electron density or spatial structure of the acid anhydrides, thereby altering their reaction and indirectly affecting the polymerization reaction of acid anhydrides. Therefore, the infusion environment and alcohols result in a cured polymer infusion material that not only has good strength but also a certain degree of flexibility. The dispersant can improve the dispersion effect between raw materials, thus contributing to the uniformity of the raw materials. The curing time of the polymer infusion material can be adjusted by adjusting the curing agent.

[0065] In some embodiments, the ratio of the anhydride compound, alcohol, dispersant, and curing agent, by mass, is 1 part : (0.35 parts - 5.5 parts ): (0.035 parts - 0.205 parts ): (0.005 parts - 0.02 parts).

[0066] In some embodiments, the time from the injection of the polymer injection material to its curing is ≤30 minutes, and the time for the compressive strength of the cured polymer injection material to reach 50% of the compressive strength of the fully cured polymer injection material is ≤1.5 hours.

[0067] Within the above-mentioned raw material ratio range of the present invention, the ratio of curing agent and dispersant can be adjusted according to the construction environment temperature to ensure that after the polymer injection material is injected, the time for it to begin gelling and lose fluidity is ≤30min, and the time required for the polymer injection material to reach 50% of its compressive strength is ≤1.5h.

[0068] Those skilled in the art should understand that the obtained polymer injection material must be able to fully diffuse into the voids after injection in order to achieve the function of filling the voids. Therefore, the time from injection to the start of curing of the polymer injection material should be controlled to be ≤30 minutes. Furthermore, the polymer injection material must be able to cure rapidly in order to support the rail transit. Therefore, in this invention, it is also necessary to control the polymer injection material to cure rapidly to achieve better compressive strength.

[0069] In some embodiments, the anhydride compounds include one or more of maleic anhydride, polymaleic anhydride, cyclohexanediol anhydride, phthalic anhydride, ethylpropionic anhydride, and acetic propionic anhydride.

[0070] In some embodiments, the alcohols include one or more of methanol, polymethanol, polyvinyl alcohol, polyethylene glycol, polypropylene glycol, polyethylene adipate, and polybutylene succinate.

[0071] In some embodiments, the dispersant includes one or more of dichloromethane, trichloromethane, tetrachloromethane, styrene, stilbene, DMF (dimethylformamide), and DMA (dimethylacetamide).

[0072] In some embodiments, the curing agent includes one or more of aliphatic amines, cycloaliphatic amines, aromatic amines, polyamides, and polyether amines.

[0073] In some embodiments, the polymeric infusion material comprises maleic anhydride, polyethylene adipate, stilbene, and aliphatic amine, wherein the ratio of maleic anhydride, polyethylene adipate, stilbene, and aliphatic amine by mass is 1:4:0.15:0.01.

[0074] Secondly, some embodiments of the present invention also provide the application of the method for treating defects in the integral track bed of existing linear elastic short sleepers under time and space constraints in the treatment of track bed defects.

[0075] In the application of this invention, as an example, the treatment of track bed defects can be completed collaboratively by three work teams. The first team is responsible for steps S1, S2, S3, and S5; the second team is responsible for step S4; and the third team is responsible for the on-site mixing and blending of the polymer injection material. Each team operates according to a streamlined workflow, which helps improve the efficiency of track bed defect treatment.

[0076] The following is a detailed explanation using specific embodiments:

[0077] Example 1, combined with Figures 1-6 To elaborate in detail:

[0078] There are gaps under the flexible short sleepers in rail transit, such as Figures 1-2 As shown, the method of the present invention is used for treatment. Figure 2 In the process, it can be seen that there is peeling and widening of gaps between the sleeper, elastic boot, and track bed, resulting in sleeper separation, empty suspension, and aging and loss of elasticity of the rubber boot, which leads to gaps between the sleeper, elastic boot, and track bed.

[0079] The proposed renovation and repair project for the integrated track bed defects using flexible short sleepers can be completed through the collaboration of three work teams. Specifically, the first team is responsible for processes S1, S2, S3, and S5; the second team is responsible for process S4; and the third team is responsible for the on-site mixing and proportioning of the polymer injection material. This streamlined operation not only improves construction efficiency but is also more suitable for on-site renovation projects involving large areas of flexible short sleeper defects.

[0080] S1: Drill holes at an angle downwards on the track bed surface on both sides of the flexible short sleeper, so that the resulting holes form an angle of less than 90° with the flexible short sleeper. Figure 3 As shown;

[0081] Specifically, the process involves drilling downwards at an angle (approximately 1 cm in diameter) into the track bed on both sides of the flexible short sleeper in the direction perpendicular to the track. The drilling angle is inclined from the track bed surface towards the flexible short sleeper, and the hole diameter must penetrate the track bed and rubber boots without damaging the flexible short sleeper. This angled drilling increases the fluidity and coverage of the polymer injection material in the gaps, allowing it to more effectively fill the voids between the flexible short sleeper, the elastic boots, and the track bed, thus improving the repair effect. Simultaneously, the downward-angled drilling method allows the injection material to fill from bottom to top, effectively avoiding voids and uneven filling, ensuring a dense seal.

[0082] S2: A metal injection needle is embedded in the duct to facilitate subsequent injection of polymer injection materials, such as... Figure 5 As shown;

[0083] S3: Temporarily seal the contact point between the flexible short sleeper and the track bed surface, and leave vent holes, such as... Figure 4 As shown;

[0084] Specifically, the area around the sleepers is temporarily sealed off, and vent holes are provided. These vent holes effectively prevent air bubbles from accumulating, ensuring that the polymer injection material fills the gaps around and at the bottom of the elastic short sleepers evenly and densely, thus improving the overall stability of the structure. To save construction time within the same work window, processes S1, S2, and S3 can also be completed in advance within one work window before the injection of the polymer injection material.

[0085] S4: Under a pressure of 3MPa, the polymer injection material is injected through the channels of S1 into the gaps between the elastic short sleepers, rubber boots, and the track bed. When polymer injection material overflows from the vent holes, it indicates that the injection work is complete. Figure 6 As shown in the figure. Specifically, a small pressurized injection device for injecting epoxy resin (for example, an injection volume of about 1 kg of injection material can be used at a time) is used to inject polymer injection material into the gaps between the elastic short sleepers, rubber boots and the track bed through pre-embedded injection needles. When the injection material overflows from the vent hole, it indicates that the injection work is completed.

[0086] S5: After the polymer grouting material has cured, seal the grouting holes and remove the temporary sealing material from the elastic short sleepers in S3. Specifically, after the polymer grouting material has cured, seal the grouting holes to ensure a tight bond with the surrounding track bed structure to prevent the intrusion of moisture and impurities; and remove the temporary sealing material around the sleepers. To ensure sufficient curing time for the grouting material and improve the efficiency of streamlined operations, this process can also be performed during the next track maintenance window.

[0087] In the offline flexible short sleeper renovation construction test, three teams of 15 people were able to complete the construction of a single 50-meter rail in each track window. This is nearly 10 times faster than the existing flexible short sleeper track bed renovation construction speed, which enables the efficient resolution of gaps and empty suspension problems in the overall track bed of tens of kilometers of existing flexible short sleeper tracks in a short period of time.

[0088] The raw materials of the polymer injection material used in Example 1 are maleic anhydride, polyethylene adipate, stilbene, and fatty amine. By mass, the ratio of maleic anhydride, polyethylene adipate, stilbene, and fatty amine is 1:4:0.15:0.01.

[0089] Table 1. Test results of the polymer infusion material in Example 1:

[0090]

[0091] Test results of the polymer injection material revealed that the polymer injection material of this invention can not only treat the damage but also improve the supporting strength and reduce cracks. Furthermore, the polymer injection material of this invention also has good fluidity, allowing it to flow to the affected areas of the track bed and fully fill them.

[0092] Finally, this invention provides a method for treating defects in the integral track bed of the elastic short sleeper. The method involves drilling downward-sloping holes on both sides of the track bed surface perpendicular to the track direction of the elastic short sleeper, and embedding metal injection needles at the drilled locations. Simultaneously, temporary sealing is applied around the sleeper, with vent holes provided. During construction, a small pressurized injection device is used to inject polymer injection material into the gaps between the elastic short sleeper, rubber boots, and track bed through the pre-embedded injection needles, achieving an integral connection between the sleeper, elastic boots, and track bed, completely resolving the issues of gaps and loose sections in the integral track bed of the elastic short sleeper. This construction process is simple, has low modification costs, and exhibits good economic efficiency and operability.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A method for treating defects in the integral track bed of existing linear elastic short sleepers under time and space constraints, characterized in that, Includes the following steps: S1: Drill holes at an angle downwards on the track bed on both sides of the elastic short sleeper, so that the holes form an angle of less than 90° with the elastic short sleeper. S2: A metal injection needle is embedded in the duct; S3: Temporarily seal the contact point between the flexible short sleeper and the track bed surface, and leave vent holes; S4: Under pressure, the polymer injection material is injected through the channel of S1 into the gap between the elastic short sleeper, rubber boot and track bed. When polymer injection material overflows from the vent hole, it indicates that the injection work is completed. S5: After the polymer injection material has cured, seal the injection hole and remove the temporary sealing material of the elastic short sleeper in S3; The polymer infusion material comprises maleic anhydride, polyethylene adipate, stilbene, and fatty amine, wherein the ratio of maleic anhydride, polyethylene adipate, stilbene, and fatty amine by mass is 1:4:0.15:0.

01. The polymer infusion material is a polymer infusion material with a compressive strength of 50MPa-70MPa, an elastic modulus of 149MPa-297MPa after curing, and a flow spread of not less than 350mm. The time from the injection of the polymer injection material to its curing is ≤30 minutes, and the time for the compressive strength of the cured polymer injection material to reach 50% of the compressive strength of the fully cured polymer injection material is ≤1.5 hours.

2. The treatment method according to claim 1, characterized in that, In S1, during the drilling operation, the hole needs to penetrate the track bed and the rubber boot, and the hole connects the elastic short sleeper, the rubber boot and the track bed.

3. The treatment method according to claim 1, characterized in that, The pressure in S4 is greater than 0 MPa and not greater than 4 MPa.

4. The treatment method according to claim 1, characterized in that, The diameter of the channel is 0.8cm-1.2cm.

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