Track, track manufacturing method and track repair method

Abstract

To provide a track, a track manufacturing method and a track repair method that can suppress the destruction of filled ballast 10 due to repeated displacement of sleepers 4.SOLUTION: A track has sleepers 4, filled ballast 10, and a sealing member 20. The filled ballast 10 is made by using ballast 12 as aggregates and filling it with a grout material 14, and supports the sleepers 4. The sealing member 20 covers a first boundary part A between the sleepers 4 and the filled ballast 10. The sealing member 20 is made of an elastic material.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a track, a track manufacturing method, and a track repair method. [Background technology]

[0002] Prepacked concrete trackbeds (hereinafter referred to as "filled trackbeds"), which are formed by using ballast as aggregate and filling it with grout, have been proposed as a labor-saving track for existing railway lines such as the Shinkansen. The filled trackbeds are formed inside formwork.

[0003] Rainwater and other water may seep into the boundary between the packed bed and the formwork. In cold, snowy regions, the freezing and thawing action of the infiltrated water may cause cracks in the packed bed. Therefore, a technique has been proposed in which excess grout material is applied to the boundary between the packed bed and the formwork (see, for example, Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Takahashi, Takazo, Momotani, Naotsugu, Ito, Ikki, Naganuma, Hikaru, Oikawa, Yuya, Suzuki, Minoru, Suzuki, Hiroaki: Development of existing Shinkansen ballastless track for cold regions, Railway Technical Research Institute Report, vol.28, No.6, June 2014. Summary of the Invention [Problem to be solved by the invention]

[0005] When a railway vehicle travels on the track, the sleepers are repeatedly displaced in the vertical direction. This repeated displacement of the sleepers causes the adhesion between the sleepers and the ballast bed to break, creating a gap between them. If rainwater or other liquids enter this gap, the repeated displacement of the sleepers causes pressure fluctuations in the infiltrated water, which can lead to the destruction of the ballast bed.

[0006] Furthermore, even if excess grout is applied to the boundary between the sleepers and the filled ballast, the grout cannot accommodate the repeated displacement of the sleepers. The bond between the sleepers and the grout breaks, allowing rainwater and other substances to seep into the boundary.

[0007] The problem to be solved by the present invention is to provide a track, a track manufacturing method, and a track repair method that can suppress destruction of the filled ballast due to repeated displacement of the sleepers. [Means for solving the problem]

[0008] A track according to a first aspect of the present invention comprises sleepers, a ballast track bed, and a sealing member. The ballast track bed is formed by using ballast as aggregate and filling it with grout, and supports the sleepers. The sealing member covers a first boundary portion between the sleepers and the ballast track bed. The sealing member is made of an elastic material.

[0009] The sealing member, which is made of an elastic material, deforms in response to the repeated displacement of the sleeper. This prevents the adhesion between the sleeper and the sealing member from breaking, allowing the sealing member to continue to cover the first boundary. Because moisture is prevented from entering the first boundary, moisture pressure fluctuations caused by repeated sleeper displacement do not occur. This makes it possible to prevent damage to the filled track bed caused by repeated sleeper displacement.

[0010] In a second aspect of the present invention, in the track according to the first aspect, the filling track is disposed horizontally inside the formwork, and the sealing member covers the entire upper surface of the filling track, including the second boundary between the formwork and the filling track. This prevents moisture from adhering to the upper surface of the filling bed and prevents moisture from entering the second boundary portion, thereby preventing deterioration of the filling bed due to the freezing and thawing action of moisture.

[0011] In a third aspect of the present invention, in the track according to the first or second aspect, the sealing member is a cement asphalt paste. Cement asphalt paste is an elastic material that can prevent damage to the filled track due to repeated sleeper displacement. In addition, cement asphalt paste is a waterproof material that can prevent deterioration of the filled track due to the freezing and thawing action of water.

[0012] A track manufacturing method according to a fourth aspect of the present invention includes a ballast formation step and a sealing step. In the ballast formation step, grout material is filled using ballast as aggregate to form a filled ballast that supports sleepers. In the sealing step, a first boundary between the sleepers and the filled ballast is covered with a sealing member made of an elastic material. This makes it possible to prevent damage to the filled ballast caused by repeated displacement of the sleepers.

[0013] In a fifth aspect of the present invention, in the track manufacturing method according to the fourth aspect, the track bed forming step forms a filled track bed inside the formwork in the horizontal direction, and the sealing step covers the entire upper surface of the filled track bed, including a second boundary portion between the formwork and the filled track bed, with a sealing member. This makes it possible to suppress deterioration of the packed bed due to the freezing and thawing action of moisture.

[0014] In a sixth aspect of the present invention, in the track manufacturing method according to the fifth aspect, the sealing material is a cement asphalt paste. In the sealing step, a mixture of asphalt emulsion and cement is applied to the entire upper surface of the filled track bed to form the sealing material. Asphalt emulsion has excellent mixing properties with cement, so the mixture can be easily mixed using ordinary power tools. In addition, asphalt emulsion has excellent fluidity after mixing, so the mixture can be applied simply by pouring it onto the top surface of the filled roadbed.

[0015] A track repair method according to a seventh aspect of the present invention is a method for repairing a track having sleepers, a filled track bed, and a sealing member. The filled track bed is formed by filling ballast as aggregate with grout material and supports the sleepers. The sealing member covers a first boundary between the sleepers and the filled track bed. The sealing member is a cement asphalt paste. The area around a crack in the sealing member is heated to melt the sealing member and repair the crack. Cement asphalt paste has thermoplastic properties, so when the area around the crack in the sealing material is heated, the sealing material melts and seals the crack, making it easy to repair the crack in the sealing material. [Effects of the Invention]

[0016] The track and track manufacturing method of the present invention can prevent damage to the filled ballast caused by repeated sleeper displacement. Furthermore, the track repair method of the present invention can easily repair cracks in sealing members. [Brief explanation of the drawings]

[0017] [Figure 1] Plan view of the track. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] Enlarged view of the right half of Figure 2. [Figure 4] An explanatory diagram of the first specimen for the freeze-thaw test. [Figure 5] An explanatory diagram of the second specimen for the freeze-thaw test. [Figure 6] An explanatory diagram of the third specimen for the freeze-thaw test. [Figure 7] FIG. 10 is an explanatory diagram of a follow-up test of a sealing member. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a track, a track manufacturing method, and a track repair method according to an embodiment will be described with reference to the drawings. Fig. 1 is a plan view of a track 1. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. The track 1 is a road made up of structures for running railway vehicles. The track 1 has rails 2, sleepers 4, and a filled trackbed 10.

[0019] In this application, the Z direction, X direction, and Y direction of the Cartesian coordinate system are defined as follows: The Z direction is the vertical direction. The X direction and Y direction are horizontal directions. The X direction is the direction in which the rails 2 extend. The Y direction is the direction in which the pair of rails 2 move apart. In the Y direction, the side closer to the center of the pair of rails 2 is called the inside, and the side farther away from the center of the pair of rails 2 is called the outside.

[0020] The rails 2 extend in the X direction. A pair of rails 2 are arranged parallel to each other and spaced apart in the Y direction. The rails 2 are arranged above the sleepers 4. The rails 2 are fixed to the sleepers 4 by fastening devices 6. The fastening devices 6 are arranged on both the inside and outside of the rails 2 in the Y direction.

[0021] The sleepers 4 are made of prestressed concrete (PC). PC is concrete prestressed by prestressing steel. The sleepers 4 may be synthetic sleepers made of glass fiber and rigid urethane foam. When viewed vertically, the sleepers 4 have a rectangular shape with the short side in the X direction and the long side in the Y direction. The sleepers 4 extend to the outside of the pair of rails 2 in the Y direction. Multiple sleepers 4 are arranged approximately parallel to each other and spaced apart in the X direction.

[0022] The ballast bed 10 supports the sleepers 4. As shown in FIG. 2, the ballast bed 10 is arranged vertically between the sleepers 4 and the roadbed 8. The roadbed 8 may have an upper roadbed 8a and a lower roadbed 8b. The upper roadbed 8a is, for example, an asphalt roadbed formed from an asphalt mixture.

[0023] Fig. 3 is an enlarged view of the right half of Fig. 2. In Fig. 3, the rail 2 and the fastening device 6 are omitted. The ballast 10 is a prepacked concrete ballast that uses ballast 12 as aggregate and is filled with grout 14. The ballast 12 is crushed stone with a maximum particle size of approximately 40 mm. The grout 14 is mortar. Mortar is made from a mixture of water and a premix of cement and fine aggregate. The upper end of the ballast 10 in the Z direction is located at the middle of the sleeper 4 in the Z direction. The ballast 10 covers the lower half of the side surfaces of the sleeper 4 in the X and Y directions.

[0024] The filling track 10 is arranged inside the formwork 16 in the Y direction. The formwork 16 is made of concrete. The formwork 16 is formed in the shape of a plate with its thickness direction in the Y direction. The formwork 16 extends in the X direction. The lower end of the formwork 16 in the Z direction is fixed to the roadbed 8. The upper end of the formwork 16 in the Z direction is positioned above the upper end of the filled track bed 10 in the Z direction. A pair of formworks 16 are positioned on both outer sides of the sleeper 4 in the Y direction.

[0025] Conventional ballasted track has a ballasted trackbed. The ballast on the ballasted trackbed is deformed by repeated passage of railway vehicles. Therefore, the ballasted trackbed requires periodic maintenance. In contrast, the track of the embodiment is a ballastless track with a fillable trackbed 10. The fillable trackbed 10 hardly deforms even when railway vehicles pass over it repeatedly. Therefore, the fillable trackbed 10 allows for labor-saving maintenance.

[0026] In general, concrete structures deteriorate due to the freeze-thaw action of water, causing cracks and other problems. The freeze-thaw action is a process in which the water contained in hardened concrete repeatedly expands due to freezing and contracts due to thawing. Since the filling track bed 10 also deteriorates due to the freeze-thaw action, it is necessary to prevent moisture from adhering to and entering the filling track bed 10. The Y-direction side of the filling track bed 10 is covered with formwork 16.

[0027] Meanwhile, the entire upper surface of the filling track bed 10 in the Z direction is covered with a sealing member (protective layer) 20. The sealing member 20 is a waterproof material that is waterproof (non-permeable). The sealing member 20 is formed to a thickness of 1 mm or more in the Z direction. This prevents moisture from adhering to the upper surface of the filling track bed 10.

[0028] The sealing member 20 is formed between the formwork 16 and the sleeper 4 in the horizontal direction. The sealing member 20 is adhered to the formwork 16 and the sleeper 4. The sealing member 20 covers the second boundary portion B between the formwork 16 and the refrigerated track bed 10. This prevents moisture from entering the second boundary portion B between the formwork 16 and the refrigerated track bed 10. The sealing member 20 covers the first boundary portion A between the sleeper 4 and the refrigerated track bed 10. This prevents moisture from entering the first boundary portion A between the sleeper 4 and the refrigerated track bed 10. This makes it possible to prevent deterioration of the refrigerated track bed due to the freezing and thawing action of moisture.

[0029] The sealing member 20 is composed of a coating film, sheet, or the like. When the sealing member 20 is a coating film, a preferred coating material is cement asphalt paste. The main components of cement asphalt paste are special asphalt emulsion, cement, and admixtures. The special asphalt emulsion contains straight asphalt, SBR latex, and water. The cement asphalt paste is a waterproof material.

[0030] The inventors of the present application conducted a freeze-thaw test to confirm the waterproofing properties of the cement asphalt paste for the filled roadbed 10. The freeze-thaw test was conducted in accordance with JIS A 1148 "Test method for freeze-thawing of concrete."

[0031] Figure 4-6 is an explanatory diagram of a specimen 30 for a freeze-thaw test. In Figure 4-6, the left figure is a cross-sectional view taken along line LL in the right figure, and the right figure is a cross-sectional view taken along line RR in the left figure. Figure 4 shows the first specimen 31, Figure 5 shows the second specimen 32, and Figure 6 shows the third specimen 33. The cross-section of specimen 30 is square, with each side measuring 100 mm. The length of specimen 30 is 400 mm. Specimen 30 has a specimen body 30a made of the same material as the filled track bed 10.

[0032] In the first specimen 31 shown in Fig. 4, a first side surface 34 of the specimen body 30a is exposed, and the other surfaces are covered with a coating material 36. The coating material 36 is a material that is completely waterproof.

[0033] In the second specimen 32 shown in Figure 5, a second side surface 35 adjacent to a first side surface 34 of the specimen body 30a is covered with a concrete board 37, leaving the first side surface 34 exposed, and the other surfaces are covered with a coating material 36. The concrete board 37 corresponds to the formwork 16 of the track 1.

[0034] In the third test piece 33 shown in Figure 6, the second side surface 35 of the test piece main body 30a was covered with a concrete board 37, the first side surface 34 was covered with a protective layer 38 of cement asphalt paste, and the other surfaces were covered with a coating material 36. The protective layer 38 corresponds to the sealing member 20 of the track 1. Two types of the third test piece 33 were created, with the protective layer 38 having thicknesses of 1 mm and 5 mm.

[0035] The test method was an underwater freeze-thaw test (Method A). That is, the entire surface of the test specimen 30 was always covered with water approximately 3 mm thick. In one freeze-thaw cycle, the temperature at the center of the test specimen 30 dropped from 5°C to -18°C, and then rose from -18°C to 5°C. This freeze-thaw cycle was repeated 300 times. After the freeze-thaw cycle, the primary resonance frequency of the flexural vibration of the test specimens 30 was measured, and the relative dynamic modulus of elasticity and durability index were calculated. The durability index of each test specimen 30 is shown in Table 1.

[0036] [Table 1]

[0037] The target durability index was set at 85 or above. 4, the first side surface 34 of the specimen body 30a is exposed to water, and therefore the freeze-thaw performance is insufficient even if the other surfaces are covered with a coating material. As a result, the durability index of the first specimen 31 was slightly below the target value.

[0038] In the second specimen 32 shown in Figure 5, the second side surface 35 of the specimen body 30a is covered with a concrete board 37, and the first side surface is exposed to water. Because water penetrates into the boundary between the second side surface 35 of the specimen body 30a and the concrete board 37, the freeze-thaw performance of the second specimen 32 is poor. As a result, the durability index of the second specimen 32 was significantly lower than the target value.

[0039] In the third specimen 33 shown in FIG. 6, the boundary between the second side surface 35 of the specimen body 30a and the concrete board 37 is covered with a protective layer 38 of cement asphalt paste. Because water is prevented from entering the boundary, the third specimen 33 has high freeze-thaw performance. As a result, the durability index of the third specimen 33 exceeded the target value. This confirmed the waterproofing properties of the cement asphalt paste.

[0040] The durability index of the third specimen 33 exceeded the target value when the thickness of the protective layer 38 was both 5 mm and 1 mm. This confirmed that when the sealing member 20 of the track 1 is made of cement asphalt paste, the thickness in the Z direction should be 1 mm or more.

[0041] When a railway vehicle travels on the track 1, the sleepers 4 are repeatedly displaced in the vertical direction. The magnitude of the repeated displacement of the sleepers 4 is approximately 0.1 to 0.5 mm. The sealing member 20 is made of an elastic material so that it can follow the repeated displacement of the sleepers 4. That is, the sealing member 20 is made of a material that is waterproof and elastic. The cement asphalt paste described above is a material that is waterproof and elastic. This allows the sealing member 20 to follow the repeated displacement of the sleepers 4. Peeling (breaking of adhesion) of the sealing member 20 from the sleepers 4 is suppressed.

[0042] The inventors of the present application measured the Young's modulus (elastic modulus) of a cement asphalt paste suitable for use as the sealing member 20. To measure the Young's modulus, a uniaxial compression test was conducted on a cylindrical specimen of the cement asphalt paste. The cylindrical specimen had a diameter of 50 mm and a height of 100 mm. The Young's modulus was measured at a vertical strain of 2000 με (corresponding to a vertical displacement of 0.2 mm) on the cylindrical specimen. The Young's moduli measured for two cylindrical specimens were 114 MPa and 126 MPa. From these results, it is clear that the Young's modulus of the sealing member 20 is between 100 MPa and 130 MPa, with approximately 120 MPa being preferred.

[0043] FIG. 7 is an explanatory diagram of a follow-up test of the sealing member 20. The inventors of the present application conducted a follow-up test to confirm the follow-up ability of the sealing member 20 in response to repeated displacement of the sleeper 4. As shown in FIG. 7, concrete corresponding to the sleeper 4 was placed above the roadbed 8, with an elastic material 9 sandwiched between them. Concrete corresponding to the filled track bed 10 was placed around the sleeper 4 in the X and Y directions. A sealing member 20 made of cement asphalt paste was placed on top of the filled track bed 10. The thickness of the sealing member 20 was 5 mm. The sealing member 20 was adhered to the side surfaces of the sleeper 4 in the X and Y directions.

[0044] In the state shown in Figure 7, sleeper 4 was displaced repeatedly in the Z direction. The amplitude of the repeated displacement was 0.2 mm, and the number of times was 1.5 million. The reason for setting the number of repeated displacements at 1.5 million is as follows. For railway vehicles, the number of wheels per vehicle is assumed to be 4 axles, the number of cars per train set is assumed to be 10,000, and the number of train sets passing per day is assumed to be 250. In this case, the number of passing wheels per day is 4 axles x 10 cars x 250 train sets = 10,000 times. Assuming the number of passing wheels for 150 days, the number of repeated displacements is 1.5 million times.

[0045] When the sleeper 4 was repeatedly displaced in the Z direction, no deformation occurred in the sealing member 20. In other words, no cracks or the like occurred in the sealing member 20. Furthermore, the adhesion of the sealing member 20 to the sleeper 4 was maintained.

[0046] The inventors of the present application conducted a water permeability test to confirm the waterproofing of the sealing member 20 before and after repeated displacement of the sleepers 4. As shown in Figure 7, in the water permeability test, walls 18 are provided around the sealing member 20 and the filled track bed 10 in the X and Y directions. Water is poured inside the walls 18 and left for a certain period of time. After the water is removed, the sealing member 20 is removed and it is confirmed whether water has entered the bottom surface of the sleeper 4.

[0047] As a result of the water permeability test, no water entered the bottom surface of the sleeper 4 before or after the repeated displacement of the sleeper 4. This confirmed that the waterproof properties of the sealing member 20 were maintained before and after the repeated displacement of the sleeper 4. From the above, it was confirmed that the sealing member 20 made of cement asphalt paste has the ability to follow the repeated displacement of the sleeper 4.

[0048] As the material of the sealing member 20, it is also possible to adopt a material other than cement asphalt paste. When the sealing member 20 is a coating, urethane-based, asphalt-based, chloroprene-based, or other materials can be used as the coating material. Urethane-based materials are primarily composed of polyisocyanate / polyol. Asphalt-based materials are primarily composed of asphalt. Chloroprene-based materials are primarily composed of chloroprene rubber or chlorosulfonated polyethylene rubber. These materials are applied to the top surface of the filled roadbed 10 by brushing or the like.

[0049] When the sealing member 20 is a sheet, it is possible to use a vinyl chloride sheet, a rubber sheet, a thermoplastic elastomer (TPE) sheet, an asphalt sheet, or the like.

[0050] The vinyl chloride sheets are mainly composed of vinyl chloride resin and are bonded to adjacent vinyl chloride sheets, formwork 16, and sleepers 4 with an epoxy resin adhesive.

[0051] The rubber sheets are mainly composed of synthetic rubber such as ethylene propylene rubber, butyl rubber, etc. The rubber sheets are bonded to adjacent rubber sheets, formwork 16, and sleepers 4 with a rubber or resin adhesive.

[0052] The TPE sheet is mainly composed of polyolefin resin and is bonded to adjacent TPE sheets, formwork 16, and sleepers 4 by heating and melting.

[0053] The asphalt sheets are made by impregnating a base material such as paper or nonwoven fabric with asphalt. The asphalt sheets are bonded to adjacent asphalt sheets, formwork 16, and sleepers 4 by heat melting or self-adhesion.

[0054] As described above in detail, the track 1 of the embodiment has sleepers 4, a fillable track bed 10, and a sealing member 20. The fillable track bed 10 is formed by filling grout material 14 with ballast 12 as aggregate, and supports the sleepers 4. The sealing member 20 covers the first boundary portion A between the sleepers 4 and the fillable track bed 10. The sealing member 20 is made of an elastic material.

[0055] The sealing member 20, which is made of an elastic material, deforms in response to the repeated displacement of the sleeper 4. This prevents the adhesion between the sleeper 4 and the sealing member 20 from breaking, and the sealing member 20 continues to cover the first boundary portion A. Because moisture is prevented from entering the first boundary portion A, no fluctuations in moisture pressure occur due to the repeated displacement of the sleeper 4. This makes it possible to prevent damage to the filled track bed 10 due to the repeated displacement of the sleeper 4.

[0056] A manufacturing method of the track 1 of the embodiment will be described with reference to Figures 2 and 3. Below, a method of converting an existing ballast track into a ballastless track of the embodiment will be described. First, the ballast bed of the ballasted track is removed. Specifically, the rails 2 and sleepers 4 are temporarily supported. Next, the ballast is removed from below the sleepers 4. This exposes the roadbed 8.

[0057] Next, grout material 14 is filled using ballast 12 as aggregate to form a filled track bed 10 that supports sleepers 4 (track bed forming step). Specifically, first, a pair of formworks 16 are installed on the upper surface of the roadbed 8 on both outer sides of the sleeper 4 in the Y direction. Next, ballast 12 is introduced above the roadbed 8 inside the pair of formworks 16. Next, the ballast 12 is filled below the sleepers 4 using a tie tamper or the like, and the ballast 12 is tamped down.

[0058] Next, the inside of the pair of formwork 16 is filled with grout material 14. Specifically, a mixture of water and premix material, which is the raw material for the grout material, is prepared. This raw material is filled into the gaps in the ballast 12 inside the pair of formwork 16. As the grout material 14 hardens, the filled track bed 10 is formed. As the sleepers 4 are supported by the filled track bed 10, the temporary support of the rails 2 and sleepers 4 is released.

[0059] Next, the entire upper surface of the filled track bed 10 is covered with a sealing material 20 (sealing process). A case where a coating of cement asphalt paste is used as the sealing material 20 will be described. A mixture of special asphalt emulsion, cement, and admixtures, which are the raw materials for cement asphalt paste, is prepared. The mixture is applied to the entire upper surface of the filled track bed 10. The asphalt and water contained in the special asphalt emulsion separate, and the asphalt hardens, forming the sealing material 20. The sealing material 20 covers the second boundary B between the formwork 16 and the filled track bed 10. The sealing material 20 covers the first boundary A between the sleeper 4 and the filled track bed 10.

[0060] As mentioned above, a special asphalt emulsion is used in the sealing process. Because the special asphalt emulsion has excellent mixability with cement, the mixture can be easily mixed using standard power tools. Furthermore, because the special asphalt emulsion has excellent fluidity after mixing, the mixture can be applied simply by pouring it onto the top surface of the packed roadbed 10. Additionally, the use of the special asphalt emulsion allows the cement-asphalt paste seal member 20 to be formed at room temperature. This completes the manufacturing of the track 1 of the embodiment.

[0061] As described above in detail, the track manufacturing method of the embodiment includes a track bed forming process and a sealing process. In the track bed forming process, grout material 14 is filled using ballast 12 as aggregate to form a filled track bed 10 that supports sleepers 4. In the sealing process, a first boundary portion A between the sleepers 4 and the filled track bed 10 is covered with a sealing member 20 made of an elastic material. This makes it possible to prevent damage to the filled ballast 10 due to repeated displacement of the sleepers 4.

[0062] A method of repairing a track when a coating of cement asphalt paste is used as the sealing member 20 will be described. Cracks may occur on the surface of the sealing member 20 due to deterioration caused by ultraviolet rays, etc. Cement asphalt paste has thermoplastic properties. Therefore, if the area around the crack in the sealing member 20 is heated, the sealing member 20 melts and seals the crack. This makes it easy to repair cracks in the sealing member 20.

[0063] As described above, the upper roadbed 8a constituting the roadbed 8 is an asphalt roadbed formed from, for example, an asphalt mixture. The asphalt mixture may be a cement asphalt paste. Even if cracks occur on the surface of the asphalt roadbed, the cracks can be sealed by heating and melting the asphalt roadbed.

[0064] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and configuration changes, combinations, deletions, etc. are also included within the scope that does not deviate from the gist of the present invention. [Explanation of symbols]

[0065] A...first boundary portion, B...second boundary portion, 1...track, 4...sleeper, 10...filled track bed, 12...ballast, 14...grout material, 16...formwork, 20...sealing material.

Claims

1. Sleepers and a filled track bed formed by using ballast as aggregate and filling grout material, and supporting the sleepers; a seal member covering a first boundary portion between the sleeper and the filled track bed, The sealing member is made of an elastic material. orbit.

2. The filling dam is arranged inside the formwork in the horizontal direction, The sealing member covers the entire upper surface of the filling track bed including a second boundary portion between the formwork and the filling track bed. The track of claim 1 .

3. The sealing member is a cement asphalt paste. A track according to claim 1 or 2.

4. a track bed formation process in which grout material is filled using ballast as aggregate to form a filled track bed that supports sleepers; a sealing step of covering a first boundary portion between the sleeper and the filled ballast with a sealing member made of an elastic material. Track manufacturing method.

5. In the ballast formation step, the filled ballast is formed inside the formwork in the horizontal direction, In the sealing step, the entire upper surface of the filling track bed, including a second boundary portion between the formwork and the filling track bed, is covered with the sealing member.

5. The method of claim 4.

6. The sealing member is a cement asphalt paste, In the sealing step, an asphalt emulsion is applied to the entire upper surface of the filled roadbed to form the sealing member.

6. The method of claim 5.

7. Sleepers and a filled track bed formed by using ballast as aggregate and filling grout material, and supporting the sleepers; a seal member covering a first boundary portion between the sleeper and the filled track bed; A method for repairing a track having The sealing member is a cement asphalt paste, heating the area around the crack in the sealing member to melt the sealing member and repair the crack; Track repair methods.

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