Ballastless track bed sleeper and track bed gap repairing method and repairing tool

Abstract

The invention discloses a method and tool for repairing a ballastless track bed sleeper and a track bed gap, and belongs to the technical field of railway engineering maintenance. The method includes: determining a gap position and cleaning impurities; a special mold is installed to form a closed cavity, and the closed cavity is fixed through a wedge-shaped pressing tool; pre-heated low-viscosity repairing materials are pressurized and injected in a staged mode, the grouting pressure is controlled and maintained, the temperature of the materials is adjusted in combination with a heating wire in the mold, and it is guaranteed that the material penetration depth is larger than or equal to 0.3 mm; and recycling redundant materials, removing the mold, and checking and accepting. The repairing tool is formed by connecting a U-shaped mold and an I-shaped mold through a spring buckle, a heating wire and a pressure and temperature monitor are arranged in the repairing tool, an inflatable air bag or a flexible sealing strip is arranged at the contact part, and a mold framework is made of high-strength composite aluminum alloy. The problems that traditional repairing filling is not full, sealing is not tight and efficiency is low are solved through sealing pressurization, precise temperature control and material recycling, and the method has the advantages of being convenient and fast to operate, high in repairing quality, environmentally friendly and economical and is suitable for repairing complex open joints.

Description

Technical Field

[0001] The present invention relates to a repair method and a repair tool, and in particular to a repair method and a repair tool for a gap between a ballastless track bed sleeper and a track bed. Background Art

[0002] Over the long-term operation of ballastless trackbeds, factors such as foundation settlement, temperature fluctuations, and train loads can cause gaps to form between the sleepers and the trackbed. These gaps not only affect the geometry and stability of the track but can also further impact the safety and operational quality of the railway line. Traditional repair methods often suffer from low repair efficiency, difficulty ensuring repair quality, incomplete filling, and high recurrence rates. Therefore, the development of efficient, precise, and environmentally friendly repair methods and tooling is crucial.

[0003] Prior art 1CN116815560A discloses a method for repairing ballastless track gaps, comprising: arranging holes in a plum blossom pattern along the laying direction of the track slab at a position avoiding steel bars, and drilling holes through the track slab to the surface of the filling layer to form a plurality of grouting holes; sealing the gaps with edge sealing members and setting a plurality of exhaust holes at intervals; inserting a grouting pipe into the grouting hole and injecting a flexible cement-based grouting material having mechanical properties similar to those of the raw materials of the filling layer into the gap through the grouting pipe in a skip-hole grouting manner; after the flexible cement-based grouting material hardens, removing the grouting pipe and the edge sealing member; cleaning the grouting hole and injecting a high-strength, slightly expansive cement-based material having mechanical properties similar to those of the track slab into the grouting hole.

[0004] Prior art 2CN107476149B discloses a method for sealing the gaps in the mortar layer of a trenchless ballastless track. The method determines the edge grouting area on the track plate sealing layer according to the gap grouting area of the mortar layer, then arranges grouting holes and pressure relief holes in the edge grouting area, and installs a glue injection pipe in each grouting hole. Grouting equipment is used to connect each grouting hole in turn to complete the grouting, thereby forming a sealing curtain located on the side of the mortar layer.

[0005] Prior art 3CN115748334A discloses a method for grouting and repairing vertical reflective cracks in a ballastless track filling layer, comprising: when the track slab is covered, drilling transverse holes at the slit positions of the base plate / support layer; using a cleaning device connected to a hollow pipe to clean the slits and cavities; injecting flexible filling material into the slits and cavities to form a flexible filling; drilling overflow holes or grouting holes on the top of the track slab to the vertical reflective cracks; installing a pressure grouting head at the position corresponding to the vertical reflective cracks, and pouring repair material into the vertical reflective cracks through the pressure grouting head until the material overflows and the grouting is stopped; grouting through the grouting holes to ensure full grouting, and then repairing the overflow holes or grouting holes.

[0006] Prior art 4CN116005498B discloses a pulsating grouting device for repairing cracks in high-speed rail tracks. This pulsating grouting device uses slurry as the working medium and utilizes the coanda effect of a jet in a specifically shaped coanda cavity. The slurry flowing out of the outlet has a wide diffusion range and high grouting efficiency. When multiple jets are superimposed, the slurry ejected from the jet oscillation outlet is ejected at a faster rate. However, both prior art 1 and 2 repair cracks between the filling layer and the track slab of CRSTI I ballastless track. Document 1 uses grouting through the track slab for repair, while Document 2 uses grouting from the side edge sealing. Their purpose is to fill the cracks between the layers. The grouting repair material is matched to the properties of the mortar layer. This method cannot repair non-planar cracks and can damage the track structure. Traditional crack and crack repair technologies are not adaptable to the irregular surfaces of sleepers, prone to poor sealing and leakage. They also lack effective pressurization, resulting in incomplete filling of the repair material and insufficient interface penetration.

[0007] Existing technology 3 is to repair vertical cracks in the filling layer of the CRSTI I type slab ballastless track, which is mainly done by drilling and setting pipes to assist the side plane edge sealing and grouting filling. This method cannot be used to repair non-planar cracks.

[0008] The prior art 4 is a flat seam repair tool, which cannot adapt to irregular and non-flat seam repair methods, and it is difficult to ensure that the seam can be filled fully. Summary of the Invention

[0009] In order to solve the defects in the prior art, the present invention discloses a method for repairing a gap between a sleeper and a ballastless track bed, and the technical solution is as follows:

[0010] A method for repairing a gap between a sleeper and a ballastless track bed, characterized by comprising the following steps:

[0011] (1) Determine the repair area: Based on the on-site disease statistics, determine the location and number of gaps between the sleeper and the trackbed;

[0012] (2) Clean the gap: Use a powerful vacuum cleaner to clean the impurities and loose materials within 3-5 cm of the gap and the edge;

[0013] (3) Installing and fixing the mold: insert the U-shaped mold part from the outside of the sleeper, and connect and fix the I-shaped part to the U-shaped part through a spring buckle to form a closed cavity that matches the sleeper and the track bed, and use a wedge-shaped pressing tool to press the mold;

[0014] (4) Pressurized grouting: Open the vent hole and inject the preheated low-viscosity repair material at a pressure of 0.2 MPa. After the vent hole overflows, close the vent hole, pressurize to 0.5-0.8 MPa and maintain the pressure for 2-3 minutes;

[0015] (5) Heating materials: Heat the repair material in the mold to 15°C-50°C according to the ambient temperature and monitor the temperature in real time;

[0016] (6) Continuous pressure maintenance: After the pressure is constant, maintain it for 2-3 minutes to ensure that the repair material is fully filled and the penetration depth is ≥0.3mm;

[0017] (7) Recycling of excess materials: Turn off the grouting equipment, discharge the excess repair materials through the exhaust holes and filter and recycle them;

[0018] (8) Remove the mold and inspect it: After removing the mold, check the repair quality and restore the circuit.

[0019] Preferably, the repair material in step (4) is a polymer resin or epoxy resin with a viscosity of ≤150 mPa·s at 25° C., a 1d strength of ≥30 MPa, a final strength of ≥60 MPa, and a bonding strength of ≥3 MPa.

[0020] Preferably, the cavity formed by the mold, the sleeper and the track bed in step (3) has a width of 10-15 mm and a height of 30-35 mm, and an inflatable airbag or a flexible sealing strip is provided at the contact portion between the mold, the sleeper and the track bed.

[0021] Preferably, in step (4), the grouting pressure is monitored in real time by a pressure monitor provided in the cavity, and the heating temperature is feedback-controlled by a temperature monitor, and the heating temperature is ≤50°C.

[0022] Preferably, the excess repair material recovered in step (7) is filtered through a filter and then reused.

[0023] The present invention further discloses a tool for repairing a gap between a sleeper and a ballastless track bed, the tool being applied to the repair method according to claim 1 and characterized in that it comprises:

[0024] A special mould, consisting of a U-shaped part and an I-shaped part connected and fixed by spring clips, which matches the shape of the sleeper to form a closed cavity with a width of 10-15mm and a height of 30-35mm;

[0025] Sealing device, located at the contact point between the mold and the sleeper or trackbed, including an inflatable airbag or a flexible sealing strip;

[0026] Wedge-shaped pressing fixture uses the steel rail to provide reaction force to press the mold;

[0027] The inlet and outlet ports and the air inlet and outlet ports are located at the bottom of the U-shaped section and the top of the I-shaped end respectively;

[0028] The heating wire, pressure monitor and temperature monitor are integrated in the cavity.

[0029] Preferably, the mold frame is made of high-strength composite aluminum alloy material with a strength of ≥300 MPa and a density of 2.7 g / cm 3 , temperature resistance range is -20℃-80℃.

[0030] Preferably, the sealing device is made of elastic material and can adapt to the irregular surfaces of the sleepers and the track bed plate.

[0031] Preferably, the air inlet and outlet are connected to an air blowing device for inflating and discharging excess repair material after grouting.

[0032] Preferably, the heating wire adjusts the temperature of the repair material to 15°C-50°C according to the ambient temperature, and performs real-time feedback control through a temperature monitor.

[0033] Beneficial effects

[0034] (1) The present invention uses a specially designed mold, including a mold body that matches the shape of the crack and is slightly larger in size, an inflatable / flexible sealing strip at the bottom, and a reasonable pressurized injection repair material method to ensure that the repair material can fill the crack and penetrate into the concrete, thereby enhancing the adhesion to the concrete interface and the strength of the concrete, and effectively improving the repair quality.

[0035] (2) The present invention prevents the grouting repair material from overflowing by providing a sealed tool, and can also recycle the repair material, thereby avoiding waste of the repair material and achieving environmentally friendly repair.

[0036] (3) The viscosity and curing effect of the repair material are crucial to the quality of the repair. The present invention uses a heating device to heat the mold, accurately controlling the heating temperature and time according to the characteristics of the repair material, reducing the viscosity of the repair material, promoting its diffusion in the crack and penetration into the concrete, thereby better utilizing the performance of the repair material and improving the quality of the crack repair.

[0037] (4) The special repair tooling of the present invention has a simple structure, the shape of the mold body matches the rail sleeper and the gap, and the various components such as the heating device, sealing device, and clamping mechanism are reasonably designed, making the operation more convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 : Flowchart for repairing the gap between sleeper and trackbed plate;

[0039] Figure 2 : Schematic diagram of the gap between the sleeper and the trackbed;

[0040] Figure 3 : Schematic diagram of special mold installation;

[0041] Figure 4 : Schematic diagram of constant pressure grouting repair;

[0042] Figure 5 : Schematic diagram of repair effect;

[0043] Description of the drawings and corresponding numbers in the drawings;

[0044] 1. Rails; 2. Sleepers; 3. Trackbed slabs; 4. Gap; 5. Special molds; 5-1. Frame; 5-2. Inflatable airbag or flexible sealing strip; 5-3. Inlet and outlet; 5-4. Air inlet and outlet; 5-5. Heating belt; 5-6. Pressure monitor; 5-7. Temperature monitor; 5-8. Wedge-shaped pressing device; 6. Repair materials. DETAILED DESCRIPTION

[0045] Traditional crack and gap repair technologies are unable to adapt to the irregular surface of sleepers, and are prone to poor sealing, leading to slurry leakage. Effective pressurization cannot be achieved, resulting in incomplete filling of the repair material and insufficient interface penetration. Since sleepers are irregular in shape, the height and slope of the protruding portion of the sleeper's bottom edge vary. Therefore, the upper edge of the special mold skeleton that fits the sleeper needs to be machined to the shape of the sleeper protrusion. Due to the errors between the sleeper and the processing tooling, a layer of plastic and deformable material is required between the special mold skeleton and the sleeper to accommodate the poor fit caused by the errors. The bottom of the special mold skeleton contacts the trackbed surface. Since the trackbed is cast-in-place on site, the height of the top surface of the trackbed slab and the protruding portion of the sleeper vary, and the trackbed surface is uneven. Therefore, a plastic and deformable material is required at the bottom of the special mold skeleton to ensure the special mold fits tightly to the trackbed surface. The plastic and deformable material can be selected as an inflatable seal or a flexible sealing material, which has strong adaptability to irregular surfaces.

[0046] In addition, the traditional low-pressure grouting method for repairing cracks is more difficult to repair cracks with a width of less than 0.2mm. It requires a long time (15 to 20 minutes) of low-pressure penetration and cannot fill small cracks in a short time. Through this method, under relatively high pressure, the cracks can be filled in a short time (3 to 5 minutes). At the same time, the grouting filling material can penetrate into the roadbed concrete, ensuring full filling while enhancing the bonding between the filling material and the concrete.

[0047] The present invention will be further explained below with reference to specific embodiments.

[0048] During the long-term operation of ballastless track, various factors may cause gaps between the sleepers and the cast-in-place roadbed slab. These gaps not only affect the structural integrity of the sleepers and roadbed slab, but may also further affect the stability and safety of the railway line. The construction process of using this patented technology to repair the gaps between the sleepers and roadbed slabs by low-pressure grouting is as follows: Figure 1 The specific contents are as follows:

[0049] A method for repairing a gap between a sleeper and a ballastless track bed, the technical solution of which is as follows:

[0050] (1) Determine the repair area

[0051] Based on the statistical results of the on-site investigation of the defects, the location and quantity of the defects 4 between the sleeper 2 and the trackbed slab 3 to be repaired are determined, and the amount of repair materials 6 and the required tools and machinery are reasonably arranged according to the construction characteristics of the skylight points.

[0052] (2) Clean the gap 4

[0053] Use a powerful vacuum cleaner to clean the impurities and loose materials on the roadbed slab 3 inside the gap 4 and within 3 to 5 cm from the edge of the gap 4 to ensure that the repair material 6 can be fully filled and can be well combined with the concrete of the roadbed slab 3. If the impurities in the gap 4 are not cleaned up, it may cause the gap 4 to be incompletely filled and the adhesion strength of the roadbed concrete interface to be low or even no adhesion strength.

[0054] (3) Install and fix special molds

[0055] First, the U-shaped frame 5-1 of the special mold 5 is inserted around the sleeper 2 from the outside of the line. The I-shaped frame 5-1 and the U-shaped frame 5-1 of the special mold 5 are then connected and secured to the other side of the sleeper 2 using spring clips, allowing the mold to be installed and removed within one minute. The special mold 5 matches the shape of the sleeper 2, forming a cavity 10-15mm wide and 30-35mm high with the sleeper 2 and the trackbed slab 3. However, the upper portion of the special mold 5 in contact with the sleeper 2 is completely consistent with the sleeper 2, while the lower portion in contact with the trackbed slab 3 is flat. Inflatable airbags or flexible sealing strips 5-2 are installed in the contact areas with the sleeper 2 and trackbed slab 3 to ensure a tight fit and form a sealed cavity. The rail 1 provides a counterforce, and a wedge-shaped clamping device 5-8 is used to clamp the mold to prevent the mold from running during pressurized grouting, causing the repair material 6 to overflow and affecting the gap filling and repair effect.

[0056] Special mold 5 frame 5-1 is made of high-strength composite aluminum alloy material, which has high strength (≥300MPa), rigidity and temperature resistance (-20℃~80℃), ensuring the compression and deformation resistance of smaller structures within a certain temperature range; its density is low (2.7g / cm 3 ), which makes the weight of the mold small and meets the requirements of lightweight skylight point construction.

[0057] The special mold 5 has a pre-set inlet and outlet 5-3 at the bottom of the U-shaped section to facilitate the injection of repair material 6 and the recovery of excess material. A gas inlet and outlet 5-4 is provided at the top of the I-shaped end to facilitate the discharge of gas from the cavity during grouting. After grouting is completed, gas is added to flush out excess material. A heating belt 5-5 is also installed within the cavity to heat the repair material 6 when the ambient temperature is low. A pressure monitor 5-6 and a temperature monitor 5-7 are also provided to monitor the grouting pressure and material temperature within the cavity in real time.

[0058] (4) Pressurized injection of repair material 6

[0059] Before grouting, open the air inlet and outlet 5-4 and pressurize the preheated low-viscosity repair material 6 (such as a polymer resin or epoxy resin) into the special mold 5 through the air inlet and outlet 5-3 at a pressure of 0.2 MPa until slurry flows out of the air inlet and outlet 5-4. Close the exhaust valve to create a sealed space. The grouting pressure should be controlled within 0.5 MPa to 0.8 MPa and maintained for 2 to 3 minutes to ensure that the repair material 6 fills the entire gap 4 and penetrates 0.3 to 1 mm at the concrete interface of the trackbed slab 3 to ensure adhesion between the grouting repair material 6 and the concrete.

[0060] The viscosity of the grouting repair material is less than 150mPa·s at 625℃, and it has good fluidity and permeability. Its gelation time is 50-60min. Its viscosity will decrease after heating. At 35℃, its viscosity is 100-120mPa·s, and the gelation time is 40-50min. At 50℃, its viscosity is 50-70mPa·s, and the gelation time is 30-40min. The lower the temperature, the higher the viscosity. At 15℃, its viscosity is 170-185mPa·s, and the gelation time is 60-70min. While ensuring good workability, its 1d strength is greater than 30MPa, the final strength is greater than 60MPa, and the bonding strength is greater than 3MPa. It also meets the maintainability within the skylight time, ensuring that the operation of the skylight is not affected after the skylight is completed.

[0061] (5) Heating material

[0062] Depending on the site's environmental requirements, if the site temperature is low (below 15°C), the repair material 6 is first heated and insulated offline. Then, a heating tape 5-5 is used online to heat the repair material 6 within the special mold 5 to ensure optimal performance. This increases the temperature of the repair material 6, reduces its viscosity, promotes its filling and penetration into the gap 4, and improves its adhesion to the concrete. However, the heating temperature must not exceed 50°C. Excessively high temperatures can cause the material to react too quickly, resulting in insufficient working time or the inability to recover excess material. The heating temperature and time must be precisely controlled based on the characteristics of the repair material 6.

[0063] (6) Continuous pressure maintenance

[0064] After the repair material 6 is injected to make the pressure in the cavity constant, a certain pressure is maintained for 2 to 3 hours, and the filling degree of the gap 6 reaches 100%. At the same time, the repair material 6 penetrates well into the concrete, and the penetration depth reaches more than 0.2mm.

[0065] (7) Recycling of excess repair materials

[0066] After the pressure is maintained, the grouting machine is turned off, the receiving pipe is connected to the inlet and outlet 5-3, and air is inflated through the inlet and outlet 5-4 to discharge and recycle the excess grouting repair material 6. A filter is provided in the recycling device to filter out granular impurities for subsequent use.

[0067] (8) Remove the mold and restore the circuit

[0068] After the materials are collected, the special mold 5 is removed and the state of the gap 4 after grouting is visually inspected to ensure that the repair quality meets the requirements and the line is restored.

[0069] The present invention also discloses a tool for repairing a gap between a sleeper and a ballastless track bed, comprising:

[0070] The main body of the special mold 5 is made of high-strength composite aluminum alloy material, including a U-shaped frame 5-1 part and an I-shaped frame 5-1 part. The U-shaped frame 5-1 part is inserted around the sleeper 2 from one side of the sleeper 2 outside the line, and the I-shaped frame 5-1 part and the U-shaped frame 5-1 part are fixed with a snap connection on the other side of the sleeper 2. The shape of the special mold 5 matches the shape of the sleeper 2, forming a cavity with a width of 10 to 15 mm and a height of 30 to 35 mm with the sleeper 2 and the track bed plate 3. The upper part of the special mold 5 that contacts the sleeper 2 is in contact with the sleeper 2. The dimensions are completely consistent, the lower part in contact with the 3-surface roadbed plate is flat, an inflatable airbag or a flexible sealing strip 5-2 is provided at the part in contact with the sleeper 2 and the 3-surface roadbed plate, a feed inlet and outlet 5-3 is preset at the bottom of the U-shaped section, an air inlet and outlet 5-4 is provided at the top of the I-shaped end, a heating belt 5-5, a pressure monitor 5-6 and a temperature monitor 5-7 are provided in the cavity; a sealing device, made of elastic material, is used to seal and reinforce the special mold 5; a wedge-shaped pressing device 5-8 uses the rail 1 to provide a reaction force for pressing the mold.

[0071] The cavity size is determined by the characteristics of the skylight point operation. Time savings are essential for each process, so the cavity size must be controlled to minimize grouting, heating, and material recovery times. Therefore, the smaller the cavity, the better. Because the cavity will house the heating tape 5-5, the receiving end of the pressure monitor 5-6, and the receiving end of the temperature monitor 5-7, the cavity width is 10-15 mm. The cavity height is based on the ballastless track structural design drawings, with the protruding edge of the sleeper 2 30 mm from the top surface of the trackbed slab 3.

[0072] The inlet and outlet ports 5-3 of the special mold 5 are used to inject the repair material 6 and recover excess material. The air inlet and outlet ports 5-4 are used to exhaust gas from the cavity during grouting and to add air to flush out excess material after grouting. The heating belt 5-5 is used to heat the material when the ambient temperature is low. The pressure monitor 5-6 and temperature monitor 5-7 are used to monitor the grouting pressure and material temperature in the cavity in real time.

[0073] The present invention aims to provide a method for repairing the gap 4 between the sleeper 2 and the track bed plate 3 of a ballastless track bed and a special repair tool. The method can efficiently and accurately repair the gap 4 between the sleeper 2 and the track bed plate 3, while ensuring the full utilization of the repair material 6 and improving the repair quality and efficiency.

[0074] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for repairing a gap between a sleeper and a ballastless track bed, characterized in that: The following steps are involved: (1) Determine the repair area: Based on the on-site disease statistics, determine the location and number of gaps between the sleeper and the trackbed; (2) Clean the gap: Use a powerful vacuum cleaner to clean the impurities and loose materials within 3-5 cm of the gap and the edge; (3) Installing and fixing the mold: insert the U-shaped mold part from the outside of the sleeper, and connect and fix the I-shaped part to the U-shaped part through a spring buckle to form a closed cavity that matches the sleeper and the track bed, and use a wedge-shaped pressing tool to press the mold; (4) Pressurized grouting: Open the vent hole and inject the preheated low-viscosity repair material at a pressure of 0.2 MPa. After the vent hole overflows, close the vent hole, pressurize to 0.5-0.8 MPa and maintain the pressure for 2-3 minutes; (5) Heating materials: Heat the repair material in the mold to 15°C-50°C according to the ambient temperature and monitor the temperature in real time; (6) Continuous pressure maintenance: After the pressure is constant, maintain it for 2-3 minutes to ensure that the repair material is fully filled and the penetration depth is ≥0.3mm; (7) Recycling of excess materials: Turn off the grouting equipment, discharge the excess repair materials through the exhaust holes and filter and recycle them; (8) Remove the mold and inspect it: After removing the mold, check the repair quality and restore the circuit.

2. The repair method according to claim 1, characterized in that: The repair material in step (4) is a polymer resin or epoxy resin with a viscosity of ≤150 mPa·s at 25° C., a 1d strength of ≥30 MPa, a final strength of ≥60 MPa, and a bonding strength of ≥3 MPa.

3. The repair method according to claim 1, characterized in that: In step (3), the cavity formed by the mold, the sleeper and the roadbed has a width of 10-15 mm and a height of 30-35 mm, and an inflatable airbag or a flexible sealing strip is provided at the contact portion between the mold, the sleeper and the roadbed.

4. The repair method according to claim 1, characterized in that: In step (4), the grouting pressure is monitored in real time by a pressure monitor provided in the cavity, and the heating temperature is feedback-controlled by a temperature monitor, and the heating temperature is ≤50°C.

5. The repair method according to claim 1, characterized in that: The excess repair material recovered in step (7) is filtered through a filter and then reused.

6. A tool for repairing a gap between a sleeper and a ballastless track bed, the tool being applied to the repair method according to claim 1, characterized in that: include: Special mould, consisting of U-shaped and I-shaped parts connected and fixed by spring clips. The mould matches the shape of the sleeper to form a closed cavity with a width of 10-15mm and a height of 30-35mm. Sealing device, located at the contact point between the mold and the sleeper or trackbed, including an inflatable airbag or a flexible sealing strip; Wedge-shaped pressing fixture uses the steel rail to provide reaction force to press the mold; The inlet and outlet ports and the air inlet and outlet ports are located at the bottom of the U-shaped section and the top of the I-shaped end respectively; The heating wire, pressure monitor and temperature monitor are integrated in the cavity.

7. The repair tool according to claim 6, characterized in that: The mold frame is made of high-strength composite aluminum alloy material with a strength of ≥300MPa and a density of 2.7g / cm 3 , temperature resistance range is -20℃-80℃.

8. The repair tool according to claim 6, characterized in that: The sealing device is made of elastic material and can adapt to the irregular surfaces of the sleepers and trackbed.

9. The repair tool according to claim 6, characterized in that: The air inlet and outlet are connected to the air blowing device, which is used to inflate and discharge excess repair materials after grouting.

10. The repair tool according to claim 6, characterized in that: The heating wire adjusts the temperature of the repair material to 15℃-50℃ according to the ambient temperature, and is controlled by real-time feedback through the temperature monitor.

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