Disease treatment method for existing line elastic short sleeper monolithic track bed under space-time limited condition

Abstract

The invention relates to the technical field of track traffic track bed disease treatment, and discloses an existing line elastic short sleeper monolithic track bed disease treatment method under space-time limited conditions, which comprises the following steps of: performing inclined downward punching operation on track bed surfaces on two sides of an elastic short sleeper to form an included angle less than 90 degrees between a formed hole channel and the elastic short sleeper; a metal pouring needle is embedded in the hole channel; temporarily plugging the contact part of the elastic short sleeper and the ballast bed, and reserving an exhaust hole; a polymer pouring material is poured into gaps among the elastic short sleeper, the rubber sleeve shoe and the ballast bed through the hole channels under the pressure, and when the polymer pouring material overflows from the exhaust holes, the pouring work is completed; and after the polymer pouring material is cured, the pouring hole is blocked, and the temporary blocking material of the elastic short sleeper is removed. According to the method, under the condition that normal operation of a line is not affected, the problems of gap opening, empty hoisting and the like of the elastic short sleeper monolithic track bed can be rapidly and efficiently solved.

Description

Technical Field

[0001] The invention relates to the technical field of rail transit roadbed disease treatment, and in particular to a method for treating the disease of an existing linear elastic short rail sleeper integral roadbed under time and space constraints. Background Art

[0002] The elastic short sleeper integral ballast bed is mainly composed of reinforced concrete ballast bed, rubber boots and rubber pads under the sleepers, reinforced concrete short sleepers and other elements. The vertical elasticity of the track of this structure is mainly provided by the rubber pads under the sleepers, which belongs to the medium vibration reduction ballast bed. Since the elastic short sleeper integral ballast bed has good vibration reduction effect and low construction cost, it is widely used in the early construction of rail transit lines.

[0003] In recent years, with the increase of later operating mileage and operating time, the elastic short sleeper track bed is constantly impacted by trains, and gradually shows problems such as aging and deformation of rubber boots, hanging sleepers, gauge changes and reduced vibration reduction effect. If these problems continue to develop, they will seriously affect the geometric state and stability of the track, and then endanger operational safety. The gap between the elastic short sleeper and the track bed is complex, ranging from less than 1mm to more than 10mm, and the gap is uneven. There are impurities such as dust, concrete debris, and water in the gap. The upper part of the gap is mostly covered by the eaves of the elastic short sleeper, which is difficult to manage. At present, two main methods are used for treatment: one is to completely remove the aging rubber boots and short sleepers through replacement operations without affecting operations, replace them with new concrete short sleepers and fasteners, and cast and restore the overall track bed. The second is to only replace the elastic boots and replace the existing elastic boots with polymer damping materials. Although these two methods can fundamentally solve the problem of elastic short sleeper track bed diseases, there will be many problems. First, there are many construction procedures, and the laying equipment and construction technology are complicated; second, due to the short window period of the existing line, the overall renovation work has very strict time control for each process. Under the condition of not affecting the operation of the existing line, the existing renovation method has a slow construction speed and is difficult to adapt to the treatment of large-scale elastic short sleeper diseases. Third, due to the short treatment time, the filling materials of the existing technology cannot obtain strong compressive strength in a short time; fourth, due to the small void space of the treatment, the compressive strength and elastic modulus of the filling material after solidification are not only required to ensure the support strength of the track and promote the stability of the structure, but also to ensure the geometric shape of the track and prevent derailment; while flexibility is to prevent the brittle cracking or fracture of the solidified material and prevent secondary damage to the elastic short sleeper.

[0004] In order to improve the speed of treating the defects of elastic short sleepers on existing lines, improve the track foundation conditions of operating lines, and avoid potential safety hazards, it is urgent to combine the application of new materials, new processes and new technologies, and continuously explore innovative solutions to meet the treatment needs of large-scale elastic short sleeper defects. Therefore, in view of the fact that there are still many defects and deficiencies in the construction materials, construction processes, and construction efficiency in the prior art, the present invention proposes a method for treating the defects of the integral ballast bed of elastic short sleepers. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for treating the defects of the integral ballast bed of an existing line with elastic short rail sleepers under time and space constraints. The method of the present invention can quickly and efficiently solve the problems of the integral ballast bed of elastic short rail sleepers, empty hanging, etc. without affecting the normal operation of the line. The method can not only meet the pouring quality, but also effectively improve the construction efficiency and reduce the impact on the operation of the existing line.

[0006] The present invention provides a method for treating defects of an existing linear elastic short rail sleeper integral track bed under time and space constraints, comprising the following steps: S1: Drill holes obliquely downward on the ballast surface on both sides of the elastic short sleeper, so that the formed holes form an angle of less than 90° with the elastic short sleeper; S2: burying a metal perfusion needle in the hole; S3: Temporarily block the contact point between the elastic short rail sleeper and the roadbed surface, and reserve exhaust holes; S4: The polymer pouring material is poured into the gap between the elastic short rail sleeper, the rubber boot and the ballast bed through the hole of S1 under pressure. When the polymer pouring material overflows from the exhaust hole, it indicates that the pouring work is completed; S5: After the polymer injection material is solidified, the injection hole is sealed and the temporary sealing material of the elastic short sleeper in S3 is removed.

[0007] Furthermore, in the above S1, during the drilling operation, the hole needs to penetrate the ballast bed and the rubber boot, and the hole connects the gaps between the elastic short sleeper, the rubber boot and the ballast bed.

[0008] Furthermore, the pressure in S4 is greater than 0 MPa and not greater than 4 MPa.

[0009] Furthermore, the diameter of the pore is 0.8 cm-1.2 cm.

[0010] Furthermore, the polymer infusion material has a compressive strength of 50MPa-70MPa, an elastic modulus of 149MPa-297MPa, and a flow expansion of not less than 350mm after curing.

[0011] Furthermore, the polymer injection material includes anhydride compounds, alcohol substances, dispersants and curing agents.

[0012] Furthermore, by mass, the ratio of the anhydride compound, the alcohol substance, the dispersant and the curing agent is 1 part: (0.35 parts-5.5 parts): (0.035 parts-0.205 parts): (0.005 parts-0.02 parts).

[0013] Furthermore, the acid anhydride compound includes one or more of maleic anhydride, polymaleic anhydride, cyclohexanecarboxylic anhydride, phthalic anhydride, ethylpropionic anhydride, and acetic propionic anhydride.

[0014] Furthermore, the alcohol substance includes one or more of methanol, polymethanol, polyvinyl alcohol, polyethylene glycol, polypropylene glycol, polyethylene adipate glycol, and polybutylene succinate glycol.

[0015] Furthermore, the dispersant includes one or more of dichloromethane, chloroform, tetrachloromethane, styrene, stilbene, DMF (dimethylformamide), and DMA (dimethylacetamide).

[0016] Furthermore, the curing agent includes one or more of aliphatic amines, alicyclic amines, aromatic amines, polyamides, and polyether amines.

[0017] Furthermore, the polymer infusion material includes maleic anhydride, polyethylene adipate, diphenylethylene and fatty amine, and the ratio of maleic anhydride, polyethylene adipate, diphenylethylene and fatty amine is 1:4:0.15:0.01 by mass.

[0018] Furthermore, the time from the injection of the polymer perfusion material to the curing of the polymer perfusion material is ≤30 minutes, and the time from the compressive strength of the cured polymer perfusion material to 50% of the compressive strength of the fully cured polymer perfusion material is ≤1.5 hours.

[0019] The present invention also provides the application of the method for treating defects of an existing linear elastic short rail sleeper integral track bed under the conditions of time and space constraints in treating track bed defects.

[0020] The embodiments of the present invention have the following technical effects: 1. In the present invention, the drilling operation is performed obliquely downward from the roadbed surface on both sides of the elastic short rail sleeper. First, the treatment efficiency is improved; second, on the basis of being able to achieve treatment, the treatment channel formed is smaller, which can reduce the impact of the treatment process on the overall structure of the elastic short rail sleeper; third, a treatment channel can be formed, which is conducive to the polymer injection material to fully enter the elastic short rail sleeper. In the treatment process, a polymer injection material with a compressive strength of 50MPa-70MPa and an elastic modulus of 149MPa-297MPa after curing is further selected, which can meet the requirements of not only treating the diseased parts through a smaller treatment channel in a narrow gap, but also the compressive strength and elastic modulus after curing can improve the support strength and reduce cracks. Since the holes formed by drilling and the roadbed defects are both narrow space environments, the polymer pouring material in the present invention also has good fluidity; on this basis, by controlling the pressure during the pouring process, not only can the polymer pouring material flow to the roadbed defects, but the polymer pouring material can also be fully filled in the roadbed defects to avoid unfilled gaps in the defects.

[0021] 2. The elastic short sleeper integral ballast bed disease treatment method proposed in the present invention does not need to remove the elastic short sleeper. It only needs to punch a small hole with a diameter of 1 cm in the ballast bed and inject polymer materials into it through a metal injection needle to solve the problems of loose fit between the sleeper and the ballast bed and gaps around the elastic boots when the sleeper moves vertically. Compared with the existing transformation process, the interference with the existing track structure is effectively reduced during the entire construction process, with fewer construction processes, simpler construction process and faster construction speed.

[0022] 3. The present invention proposes to use a high-fluidity polymer perfusion material, which has the advantages of high strength, strong adhesion, good fluidity, short setting time, and high durability; it can effectively balance the solidification speed and construction efficiency, and will not fail to meet the perfusion operation requirements due to rapid solidification, nor will it affect normal operations due to too slow solidification.

[0023] 4. The elastic short sleeper integral track bed defect treatment method proposed in the present invention has low construction cost compared with the reconstruction method of the existing elastic short sleeper, which is to remove all rubber boots and short sleepers, replace them with new concrete short sleepers and fasteners, and cast and restore the integral track bed. The project cost is saved by about 80% year-on-year. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a schematic structural diagram of an integral ballast bed of elastic short sleepers provided in an embodiment; Figure 2 It is a schematic diagram of the gap separation and empty hanging disease of the elastic short rail sleeper integral ballast provided in the embodiment; Figure 3 It is a schematic diagram of the punching operation of the elastic short rail sleeper integral track bed disease treatment method provided in the embodiment; Figure 4 It is a schematic top view of the position of the reserved exhaust holes in the method for treating the defects of the integral ballast bed of the elastic short rail sleeper provided in the embodiment; Figure 5 Schematic diagram of the buried metal injection needle position of the elastic short rail sleeper integral track bed disease treatment method provided in the embodiment; Figure 5 The middle a is the buried metal perfusion needle. Figure 5 Middle b is a top view schematic diagram of the buried metal perfusion needle; Figure 6 It is a schematic diagram of pressurized pouring of the elastic short rail sleeper integral track bed disease treatment method provided in the embodiment.

[0026] In the figure, 1-rail; 2-fastener; 3-elastic short sleeper; 4-rubber boot; 5-elastic pad; 6-ballast bed; 7-vent; 8-disease; 9-sealing material; 10-metal perfusion needle. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0028] In a first aspect, some embodiments of the present invention provide a method for treating defects in an existing linear elastic short rail sleeper integral track bed under time and space constraints, comprising the following steps: S1: Drill holes obliquely downward on the ballast surface on both sides of the elastic short sleeper, so that the formed holes form an angle of less than 90° with the elastic short sleeper; S2: burying a metal perfusion needle in the hole; S3: Temporarily block the contact point between the elastic short rail sleeper and the roadbed surface, and reserve exhaust holes; S4: The polymer pouring material is poured into the gap between the elastic short rail sleeper, the rubber boot and the ballast bed through the hole of S1 under pressure. When the polymer pouring material overflows from the exhaust hole, it indicates that the pouring work is completed; S5: After the polymer injection material is solidified, the injection hole is sealed and the temporary sealing material of the elastic short sleeper in S3 is removed.

[0029] The elastic short rail sleeper integral track bed defect treatment method proposed by the method of the present invention can complete the operation during the nighttime skylight, ensuring that the normal operation of the line is not affected; at the same time, the method has basically no effect on subsequent maintenance and transformation, providing effective protection for the long-term stability and safety of the track.

[0030] The method of the present invention does not need to take out the elastic short sleeper during the construction process, and only needs to pour into the gap between the elastic short sleeper and the ballast bed through the formed hole, thereby reducing the interference with the existing track structure.

[0031] The method of the present invention does not have a negative impact on the existing track structure during the entire construction process except for drilling a small hole with a diameter of 1 cm. Since the polymer injection material used has high fluidity and can smoothly flow through the hole to the defect, the polymer injection material can be fully filled in the defect under a relatively small pressure during the construction process, and the relatively small pressure will not damage the elastic short rail sleeper track structure, nor will it have an adverse effect on the existing geometric shape of the track, thereby ensuring driving safety.

[0032] In the present invention, the prepared polymer pouring material is not only suitable for the method of the present invention, but can also flow in the formed pores (satisfying the pouring requirements of gaps with a pore size of less than 1 mm), thereby achieving the filling of the defective parts with the polymer pouring material; in addition, the polymer pouring material of the present invention is also suitable for the treatment of defects in the integral ballast bed of elastic short rail sleepers. After curing, the polymer pouring material has good compressive strength and elastic modulus, so that the treated elastic short rail sleepers have good supporting strength and reduce the occurrence of cracks.

[0033] The method of the present invention will not affect the replacement of the elastic overshoes in the later stage. When the elastic overshoes further age, resulting in the loss of vibration reduction performance or failure to meet the vibration reduction requirements along the line, improvements can be made by replacing the elastic overshoes and elastic short sleepers with ordinary short sleepers and adding vibration reduction fasteners. This flexible transformation plan provides more options for subsequent maintenance and optimization.

[0034] The elastic short rail sleeper integral track bed disease treatment method proposed by the present invention requires simple construction machinery configuration and significantly improves the construction efficiency. Specifically, the method mainly uses manual labor with small machines and tools during construction, which greatly improves the flexibility and adaptability of the operation and can cope with different construction environments and conditions.

[0035] The elastic short rail sleeper integral track bed disease treatment method proposed by the invention has low engineering cost. The invention provides a more economical and feasible solution for the elastic short rail sleeper integral track bed disease treatment, which can effectively reduce the project budget.

[0036] In some embodiments, in said S1, during the drilling operation, the hole needs to penetrate the ballast bed and the rubber boot, and the hole connects the gaps between the elastic short sleeper, the rubber boot and the ballast bed.

[0037] In the present invention, the purpose of the punching operation is to penetrate the gap between the sleeper-shoe-ballast bed through the hole, so that when the polymer injection material is filled, the polymer injection material can be fully filled in the defective area, thereby achieving effective treatment of the defect.

[0038] In some embodiments, the pressure in S4 is greater than 0 MPa and not greater than 4 MPa.

[0039] In the present invention, by controlling the pressure and the fluidity of the polymer injection material, not only the polymer injection material can be made to flow to the defective part of the ballast bed, but also the polymer injection material can be fully filled in the defective part of the ballast bed.

[0040] In some embodiments, the diameter of the hole is 0.8 cm-1.2 cm.

[0041] In some embodiments, the polymer infusion material has a compressive strength of 50 MPa-70 MPa, an elastic modulus of 149 MPa-297 MPa, and a flow expansion of not less than 350 mm after curing.

[0042] The polymer perfusion material obtained in the present invention has good fluidity, the setting time of the polymer perfusion material of the present invention is controllable, and it has a suitable operable time during construction, and can effectively balance the solidification speed and construction efficiency. It will neither fail to meet the perfusion operation requirements due to rapid solidification, nor affect normal operation due to too slow solidification.

[0043] The polymer grouting material has excellent bonding performance at the contact points with the concrete structure and rubber boots, which significantly improves the overall integration of the polymer grouting material and the ballast bed structure, and effectively reduces the risks of separation and empty suspension caused by temperature changes or mechanical vibrations.

[0044] The polymer injection material can be cured on a wet interface. At the same time, since the density of the repair material is greater than the density of water, if the interface to be repaired is a wet interface with water, as the polymer injection material is poured, the water will be discharged before the repair material.

[0045] The polymer infusion material has a stable curing effect, which can ensure durability and consistency under various environmental conditions, ensure that the caulking material is not affected by external factors and its performance will not deteriorate during long-term use, and improve the durability and reliability of the overall structure.

[0046] The polymer pouring material has good bonding performance with concrete and rubber boots, and after the bonding part with the rubber boots is peeled off, the broken interface is at the rubber boots, and there is no uncured adhesion phenomenon.

[0047] In some embodiments, the polymer injection material includes anhydride compounds, alcohol substances, dispersants and curing agents.

[0048] In the polymer perfusion material of the present invention, a relatively closed treatment environment is formed by the method of the present invention. In a closed environment, when there is a lack of oxygen, the polymerization reaction of anhydride compounds may be further promoted, and alcohol substances can interact with anhydrides through hydrogen bonds, affecting the electron density or spatial structure of anhydrides, thereby changing their reactions and indirectly affecting the polymerization reaction of anhydride compounds. Therefore, the perfused environment and alcohol substances make the cured polymer perfusion material not only have good strength, but also have certain flexibility. Dispersants can enhance the dispersion effect between raw materials, which is beneficial to the uniformity of raw materials. The curing time of the polymer perfusion material can be adjusted by adjusting the curing agent.

[0049] In some embodiments, the ratio of the anhydride compound, the alcohol substance, the dispersant and the 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).

[0050] In some embodiments, the time from the injection of the polymer perfusion material to the curing of the polymer perfusion material is ≤30 minutes, and the time for the compressive strength of the cured polymer perfusion material to reach 50% of the compressive strength of the fully cured polymer perfusion material is ≤1.5 hours.

[0051] Within the ratio range of the above raw materials of the present invention, the ratio of curing agent to dispersant can be adjusted according to the construction environment temperature to ensure that after the polymer perfusion material is perfused, the time for gelation and loss of fluidity is ≤30min, and the time required for the strength of the polymer perfusion material that begins to solidify to reach 50% of the compressive strength is ≤1.5h.

[0052] Those skilled in the art should understand that the obtained polymer perfusion material can fully diffuse in the gaps after perfusion, so that the polymer perfusion material can achieve the filling effect on the gaps. Therefore, the time from the perfusion of the polymer perfusion material to the beginning of the solidification of the polymer perfusion material is controlled to be ≤30min; and when the inflowing polymer perfusion material can be rapidly solidified, it can achieve support for rail transit. Therefore, in the present invention, it is also necessary to control the polymer perfusion material to be able to be rapidly solidified to achieve better compressive strength.

[0053] In some embodiments, the acid anhydride compound includes one or more of maleic anhydride, polymaleic anhydride, cyclohexanecarboxylic anhydride, phthalic anhydride, ethylpropionic anhydride, and acetic propionic anhydride.

[0054] In some embodiments, the alcohol substance includes one or more of methanol, polymethanol, polyvinyl alcohol, polyethylene glycol, polypropylene glycol, polyethylene adipate glycol, and polybutylene succinate glycol.

[0055] In some embodiments, the dispersant includes one or more of dichloromethane, chloroform, tetrachloromethane, styrene, stilbene, DMF (dimethylformamide), and DMA (dimethylacetamide).

[0056] In some embodiments, the curing agent includes one or more of aliphatic amines, alicyclic amines, aromatic amines, polyamides, and polyether amines.

[0057] In some embodiments, the polymer injection material includes maleic anhydride, polyethylene adipate, diphenylethylene and fatty amine, and the ratio of maleic anhydride, polyethylene adipate, diphenylethylene and fatty amine is 1:4:0.15:0.01 by mass.

[0058] In the second aspect, some embodiments of the present invention also provide the application of the method for treating the defects of the existing linear elastic short rail sleeper integral track bed under the conditions of time and space constraints in treating the defects of the track bed.

[0059] In the application process of the present invention, as an example, the disease control construction can be completed by three teams in collaboration. 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 proportioning and mixing of the polymer injection material on site. Each team constructs in a streamlined operation mode. This is conducive to improving the efficiency of roadbed disease control.

[0060] The following is described in conjunction with specific embodiments: Embodiment 1, combination Figure 1-Figure 6 To elaborate: There is a gap under the elastic short sleeper of rail transit, such as Figure 1-Figure 2 As shown, the treatment is carried out by the method of the present invention. Figure 2 In the test, it can be seen that there is peeling and widening of the gap between the sleeper, elastic boot and ballast bed, which causes the sleeper to separate and hang in the air, and the rubber boot to age and lose elasticity, resulting in gaps between the sleeper, elastic boot and ballast bed.

[0061] The proposed elastic short sleeper integral track bed disease treatment and reconstruction construction can be completed through the collaboration of three teams. Specifically, the first team is responsible for S1, S2, S3 and S5 processes, the second team is responsible for S4 process, and the third team is responsible for the on-site proportioning and mixing of polymer injection materials. Each team constructs in a streamlined operation mode, which not only improves construction efficiency, but is also more suitable for on-site reconstruction projects of large-area elastic short sleeper diseases.

[0062] S1: Drill holes obliquely downward on the ballast surface on both sides of the elastic short sleeper, and the formed holes form an angle of less than 90° with the elastic short sleeper, such as Figure 3 As shown; Specifically, the oblique downward drilling operation (hole diameter is about 1 cm) is carried out on the roadbed surface on both sides of the elastic short sleeper in the vertical line direction. The drilling angle is inclined from the roadbed surface to the elastic short sleeper. The hole diameter needs to penetrate the roadbed and rubber boots, but does not damage the elastic short sleeper. Oblique drilling can increase the fluidity and coverage of the polymer injection material in the gap, so that the polymer injection material can be more effectively filled into the gap between the elastic short sleeper-elastic boot-roadbed, thereby improving the repair effect; at the same time, the use of oblique downward drilling can make the injection material fill from bottom to top, effectively avoiding the problem of gaps and uneven filling, and ensuring the density of the filling.

[0063] S2: A metal perfusion needle is buried in the hole to facilitate subsequent perfusion of polymer perfusion materials, such as Figure 5 As shown; S3: Temporarily seal the contact point between the elastic short rail sleeper and the roadbed surface, and reserve exhaust holes, such as Figure 4 As shown; Specifically, the sleepers are temporarily sealed around and vent holes are reserved. By reserving vent holes, bubbles are effectively prevented from being trapped, ensuring that the polymer injection material is evenly and densely filled around the elastic short sleepers and in the bottom gaps, thereby improving the overall stability of the structure. In order to save construction time within the same window period, the S1, S2 and S3 processes can also be completed in advance within a window period before the injection of the polymer injection material.

[0064] S4: Under a pressure of 3MPa, the polymer injection material is injected into the gap between the elastic short rail sleeper, the rubber boot and the ballast bed through the hole of S1. When the polymer injection material overflows from the exhaust hole, it indicates that the injection work is completed. Figure 6 Specifically, a small epoxy resin-based pressurized injection device (for example, about 1 kg of injection material can be injected at a time) is used to inject the polymer injection material into the gap between the elastic short rail sleeper, the rubber boot and the ballast bed through the pre-buried injection needle. When the injection material overflows from the exhaust hole, it indicates that the injection work is completed.

[0065] S5: After the polymer pouring material solidifies, the pouring hole is sealed and the temporary sealing material of the elastic short sleeper in S3 is removed. Specifically, after the polymer pouring material solidifies, the pouring hole is sealed to ensure that it is tightly combined with the surrounding ballast structure to prevent the intrusion of moisture and impurities; and the temporary sealing material around the sleeper is removed. In order to ensure that the pouring material has sufficient solidification time and improve the efficiency of the streamlined operation, this process can also be carried out during the next skylight time.

[0066] In the offline elastic short sleeper reconstruction construction test, three teams with a total of 15 people can complete the construction task of a single 50-meter steel rail in each skylight, which is nearly 10 times faster than the existing elastic short sleeper trackbed reconstruction construction speed. This allows the problems of gap separation and empty hanging of the entire trackbed of dozens of kilometers of elastic short sleepers on the existing line to be efficiently solved in a short period of time.

[0067] The raw materials of the polymer infusion material used in Example 1 are maleic anhydride, polyethylene adipate, diphenylethylene, and fatty amine. The mass ratio of maleic anhydride, polyethylene adipate, diphenylethylene, and fatty amine is 1:4:0.15:0.01.

[0068] Table 1 Test results of polymer infusion materials of Example 1:

[0069] The test results of the polymer injection material show that the polymer injection material in the present invention can not only be used for treatment, but also improve the support strength and reduce cracks, etc. In addition, the polymer injection material in the present invention also has good fluidity; it can promote the polymer injection material to flow to the roadbed defect, and can also make the polymer injection material fully fill the roadbed defect.

[0070] Finally, an embodiment of the present invention provides a method for treating defects of an integral ballast bed with elastic short sleepers, which performs an oblique downward drilling operation on the ballast bed surface on both sides of the elastic short sleepers in the direction perpendicular to the line, and embeds metal injection needles at the drilling positions; at the same time, the sleepers are temporarily sealed around and exhaust holes are reserved. During the construction process, a small-scale pressurized injection equipment is used to inject polymer injection materials into the gaps between the elastic short sleepers, rubber boots and ballast beds through pre-buried injection needles, thereby achieving an integral combination of the sleepers, elastic boots and ballast beds, and completely solving the problems of gap separation and empty hanging of the integral ballast bed with elastic short sleepers. The construction process is simple, the transformation cost is low, and it has good economy and operability.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A method for treating the defects of the existing linear elastic short rail sleeper integral track bed under time and space constraints, characterized in that: The steps include: S1: Drill holes obliquely downward on the ballast surface on both sides of the elastic short sleeper, so that the formed holes form an angle of less than 90° with the elastic short sleeper; S2: burying a metal perfusion needle in the hole; S3: Temporarily block the contact point between the elastic short rail sleeper and the roadbed surface, and reserve exhaust holes; S4: The polymer pouring material is poured into the gap between the elastic short rail sleeper, the rubber boot and the ballast bed through the hole of S1 under pressure. When the polymer pouring material overflows from the exhaust hole, it indicates that the pouring work is completed; S5: After the polymer injection material is solidified, the injection hole is sealed and the temporary sealing material of the elastic short sleeper in S3 is removed.

2. The treatment method according to claim 1, characterized in that: In S1, during the drilling operation, the hole needs to penetrate the ballast bed and the rubber boot, and the hole connects the elastic short rail sleeper, the rubber boot and the ballast 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 pores is 0.8 cm to 1.2 cm.

5. The treatment method according to claim 1, characterized in that: The polymer perfusion material has a compressive strength of 50MPa-70MPa, an elastic modulus of 149MPa-297MPa, and a flow expansion of not less than 350mm after curing.

6. The treatment method according to claim 5, characterized in that: The polymer infusion material includes anhydride compounds, alcohol substances, dispersants and curing agents; by mass, the ratio of the anhydride compounds, alcohol substances, dispersants and curing agents is 1 part: (0.35 parts-5.5 parts): (0.035 parts-0.205 parts): (0.005 parts-0.02 parts).

7. The treatment method according to claim 6, characterized in that: The acid anhydride compound includes one or more of maleic anhydride, polymaleic anhydride, cyclohexanecarboxylic anhydride, phthalic anhydride, ethyl propionic anhydride, and acetic propionic anhydride; The alcohol substance includes one or more of methanol, polymethanol, polyvinyl alcohol, polyethylene glycol, polypropylene glycol, polyethylene adipate glycol, and polybutylene succinate glycol.

8. The treatment method according to claim 6, characterized in that: The dispersant includes one or more of dichloromethane, chloroform, tetrachloromethane, styrene, stilbene, DMF, and DMA; the curing agent includes one or more of aliphatic amines, alicyclic amines, aromatic amines, polyamides, and polyether amines.

9. The treatment method according to claim 1, characterized in that: The time from the infusion of the polymer perfusion material to the curing of the polymer perfusion material is ≤30min, and the time from the compressive strength of the cured polymer perfusion material to 50% of the compressive strength of the fully cured polymer perfusion material is ≤1.5h.

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