CN114703701A - Ballast track closed structure based on waterproof and fatigue-resistant asphalt mixture - Google Patents
Ballast track closed structure based on waterproof and fatigue-resistant asphalt mixture Download PDFInfo
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- CN114703701A CN114703701A CN202210242574.4A CN202210242574A CN114703701A CN 114703701 A CN114703701 A CN 114703701A CN 202210242574 A CN202210242574 A CN 202210242574A CN 114703701 A CN114703701 A CN 114703701A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 159
- 239000000203 mixture Substances 0.000 title claims abstract description 85
- 241001669679 Eleotris Species 0.000 claims abstract description 6
- 239000004575 stone Substances 0.000 claims description 70
- 235000019738 Limestone Nutrition 0.000 claims description 69
- 239000006028 limestone Substances 0.000 claims description 69
- 239000002245 particle Substances 0.000 claims description 34
- 238000012546 transfer Methods 0.000 claims description 23
- 238000012360 testing method Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 18
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 14
- 239000004571 lime Substances 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 12
- 239000011707 mineral Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 6
- 239000011800 void material Substances 0.000 claims description 6
- 238000011284 combination treatment Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 101
- 230000009471 action Effects 0.000 description 4
- 239000011384 asphalt concrete Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/001—Track with ballast
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/01—Elastic layers other than rail-pads, e.g. sleeper-shoes, bituconcrete
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Railway Tracks (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a ballast track closed structure based on a waterproof fatigue-resistant asphalt mixture, which belongs to the technical field of railway engineering and aims to solve the technical problem of improving the fatigue resistance, the permanent deformation resistance and the integral bearing capacity of the ballast track closed structure, and the technical scheme is as follows: the structure of the road comprises a road bed, an emulsified asphalt macadam seal is paved on the upper portion of the road bed, a waterproof and fatigue-resistant dense asphalt mixture layer is paved on the upper portion of the emulsified asphalt macadam seal, a waterproof and permanent deformation-resistant dense asphalt gravel layer is paved on the upper portion of the waterproof and fatigue-resistant dense asphalt mixture layer, a waterproof load transmission dense asphalt mixture layer is paved on the upper portion of the waterproof and permanent deformation-resistant dense asphalt gravel layer, a ballast gravel layer covers the upper portion of the waterproof load transmission dense asphalt mixture layer, and a sleeper is paved on the upper portion of the ballast gravel layer.
Description
Technical Field
The invention relates to the field of railway engineering, in particular to a ballast track sealing structure based on a waterproof fatigue-resistant asphalt mixture.
Background
No matter new construction or existing railway ballast track railway, the off-line foundation structure is required to have good performances such as water resistance, vibration reduction, durability and maintainability. According to the traditional ballast track, the crushed stone ballast is directly paved on the surface layer of the flexible graded crushed stone foundation bed, so that the ground is easy to infiltrate underwater to form diseases such as dirt, hardening and slurry turning of the foundation bed, and the stability of the roadbed structure under the line is adversely affected.
As a typical viscoelastic material, the asphalt concrete is used as a base material under a full-section bearing layer rail, is beneficial to improving the dynamic behavior of a base structure, and has the advantages of vibration reduction, noise reduction, adaptation to roadbed deformation, easiness in maintenance, environmental friendliness, recyclability and the like. The dense asphalt concrete can be used as a waterproof layer of a railway structure, reduces the diseases of a track bed and a foundation bed, prolongs the maintenance period, saves manpower and material resources for maintenance, and is a material very suitable for being used as a railway track bed.
In recent years, full-face asphalt concrete foundation bed sealing layers are beginning to be applied in the railway field. For example, designing high-speed railways such as Hadamard, Zhengxu, Zhengwang and Jingzhang at the speed of 350km has related engineering application. However, the unified regulations for the track structure layer are not suitable for the asphalt sub-track foundation, and the layered combination of the asphalt mixture closed structure layer is also in urgent need of research.
Therefore, how to improve the fatigue resistance, the permanent deformation resistance and the overall bearing capacity of the closed structure of the ballast track is a technical problem to be solved urgently at present.
Disclosure of Invention
The technical task of the invention is to provide a ballast track closed structure based on a waterproof fatigue-resistant asphalt mixture, so as to solve the problem of how to improve the fatigue resistance, the permanent deformation resistance and the overall bearing capacity of the ballast track closed structure.
The technical task of the invention is realized according to the following mode, the ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture comprises a roadbed, an emulsified asphalt macadam sealing layer is paved on the upper part of the roadbed, a waterproof fatigue-resistant dense asphalt mixture layer is paved on the upper part of the emulsified asphalt macadam sealing layer, a waterproof permanent deformation-resistant dense asphalt gravel layer is paved on the upper part of the waterproof fatigue-resistant dense asphalt mixture layer, a waterproof load transfer dense asphalt mixture layer is paved on the upper part of the waterproof permanent deformation-resistant dense asphalt gravel layer, a ballast gravel layer covers the upper part of the waterproof load transfer dense asphalt mixture layer, and a sleeper is paved on the upper part of the ballast gravel layer; bonding layers for enhancing interface bonding are respectively arranged between the waterproof fatigue-resistant dense asphalt mixture layer, the waterproof permanent deformation-resistant dense asphalt gravel layer and the waterproof load transfer dense asphalt mixture layer.
Preferably, the roadbed adopts a natural or treated roadbed meeting the required bearing capacity, and the bearing capacity of the roadbed meets the requirement that the deflection value is less than 120(0.01 mm);
the top of the roadbed is synchronously spread with limestone wet material with the maximum grain diameter less than 4.75mm and emulsified asphalt and is subjected to interface combination treatment.
Preferably, the waterproof fatigue-resistant dense asphalt mixture layer is prepared by mixing SBS modified asphalt, limestone stone with the maximum particle size of less than 13.2 and lime mineral powder and then heating; the method comprises the following specific steps:
the SBS modified asphalt accounts for 5-5.5 percent;
the aggregate is limestone stone, and specifically comprises the following components:
5-10% of limestone stone with the grain diameter of 10-15 mm, 25-35% of limestone stone with the grain diameter of 5-10 mm, 30-40% of limestone stone with the grain diameter of 3-5 mm and 10-15% of limestone stone with the grain diameter of 0-3 mm;
the proportion of the lime mineral powder is 3 to 5 percent;
the design void fraction is less than 2.5%.
Preferably, the waterproof and permanent deformation-resistant dense-graded asphalt crushed stone layer is produced by mixing and heating No. 70 matrix asphalt, limestone stone with the maximum particle size of less than 31.5mm and limestone ore powder; the method comprises the following specific steps:
the proportion of No. 70 matrix asphalt is 4-4.2%;
the aggregate is limestone stone, and specifically comprises the following components:
5-10% of limestone stone with the particle size of 20-30 mm, 5-10% of limestone stone with the particle size of 15-20 mm, 10-15% of limestone stone with the particle size of 10-15 mm, 25-35% of limestone stone with the particle size of 5-10 mm, 30-35% of limestone stone with the particle size of 3-5 mm and 10-15% of limestone stone with the particle size of 0-3 mm;
the proportion of the lime mineral powder is 3 to 5 percent;
the design void fraction is less than 3%.
Preferably, the waterproof load transfer dense-graded asphalt mixture layer is produced by mixing and heating SBS modified asphalt, limestone stone with the maximum particle size of less than 26.5mm and lime mineral powder; the method comprises the following specific steps:
SBS pitch accounts for 4.2% -4.4%;
the aggregate is limestone stone, 5-10% of the limestone stone with the particle size of 15-25 mm, 30-35% of the limestone stone with the particle size of 10-15 mm, 25-30% of the limestone stone with the particle size of 5-10 mm, 20-30% of the limestone stone with the particle size of 3-5 mm and 10-15% of the limestone stone with the particle size of 0-3 mm;
the proportion of the lime mineral powder is 3 to 5 percent;
the design void fraction is less than 3%.
More preferably, the uniaxial compression dynamic modulus of the waterproof fatigue-resistant dense-graded asphalt mixture layer is 3000 MPa-5000 MPa, the bending tensile strength is 1-1.2 MPa, the number of times of 400 microstrain fatigue loading is 30 ten thousand, and the water permeability coefficient is less than 100 ml/min.
Preferably, the uniaxial compression dynamic modulus of the waterproof and permanent deformation resistant dense-graded asphalt crushed stone layer is 7000MPa to 11000MPa, the dynamic stability of a rutting test is more than 2000 times/mm, and the water permeability coefficient is less than 100 ml/min.
More preferably, the uniaxial compression dynamic modulus of the waterproof load transfer dense-graded asphalt mixture layer is 8000 MPa-12000 MPa, the dynamic stability of a rutting test is more than 3000 times/mm, and the water seepage coefficient is less than 100 ml/min.
Preferably, the bonding layer is sprayed emulsified asphalt.
Preferably, the thickness of the waterproof fatigue-resistant dense-graded asphalt mixture layer is 50-70 mm, the thickness of the waterproof permanent deformation-resistant dense-graded asphalt gravel layer is 100-120 mm, and the thickness of the waterproof load transmission dense-graded asphalt mixture layer is 80 mm.
The ballast track sealing structure based on the waterproof fatigue-resistant asphalt mixture has the following advantages:
according to the invention, through carrying out structural combination design on the closed structure layer of the ballast track, the waterproof fatigue-resistant dense-graded asphalt mixture is used as the lowest layer structure, so that the fatigue resistance of the closed structure layer of the ballast track under the action of dynamic load of a travelling crane is improved;
according to the invention, the waterproof and permanent deformation resistant dense-graded asphalt gravel layer is used as the middle layer structure, so that the overall bearing capacity of the closed structure layer of the ballast track is improved;
according to the invention, the waterproof load transfer dense-graded asphalt mixture layer is used as an upper structure, so that the load transfer capability of the closed structure layer of the ballast track downwards is improved;
the three structural layers of the waterproof fatigue-resistant dense-graded asphalt mixture layer, the waterproof permanent deformation-resistant dense-graded asphalt gravel layer and the waterproof load transfer dense-graded asphalt mixture layer are all made of waterproof materials, so that water is prevented from permeating into a roadbed together, and the stability of the roadbed is protected;
the invention realizes the function layered combination of the ballast track closed structure layer based on the asphalt mixture, improves the fatigue life of the ballast track asphalt closed structure layer through the layered combination design of the ballast track asphalt closed structure layer, greatly improves the fatigue resistance and prolongs the service life;
the ballast track closed structure layer can obviously improve the fatigue resistance and the permanent deformation resistance.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a ballast track closed structure based on a waterproof fatigue-resistant asphalt mixture;
FIG. 2 is a graph of the fatigue loading test results of a waterproof fatigue-resistant dense-graded asphalt mixture layer;
FIG. 3 is a graph showing the dynamic modulus test results of a waterproof permanent deformation-resistant dense-graded asphalt gravel layer at different temperatures at 10 Hz;
FIG. 4 is a graph of the dynamic stability test results of the rutting test of the waterproof permanent deformation-resistant dense-graded asphalt gravel layer;
FIG. 5 is a graph showing the test results of the dynamic modulus of a waterproof load transmission dense-graded asphalt mixture layer.
In the figure, 1, a roadbed, 2, a waterproof fatigue-resistant dense asphalt mixture layer, 3, a waterproof permanent deformation-resistant dense asphalt gravel layer, 4, a waterproof load transfer dense asphalt mixture layer, 5, a sleeper, 6, an emulsified asphalt gravel seal layer, 7, a bonding layer, 8 and a railway ballast gravel layer.
Detailed Description
The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture is described in detail below with reference to the attached drawings and specific embodiments of the specification.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description. And are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
[ examples ] A method for producing a compound
As shown in the attached drawing 1, the ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture comprises: the method comprises the steps of paving a waterproof fatigue-resistant dense-graded asphalt mixture layer 2 with the thickness of 50mm, a waterproof permanent deformation-resistant dense-graded asphalt gravel layer 3 with the thickness of 100mm and a waterproof load transmission dense-graded asphalt mixture layer 4 with the thickness of 80mm from bottom to top after the top of a natural or treated roadbed 1 meeting the condition that the bearing capacity deflection value is less than 120(0.01mm) is subjected to interface bonding treatment, and spraying bonding layers 7 for enhancing interface bonding between the waterproof fatigue-resistant dense-graded asphalt mixture layer 2, the waterproof permanent deformation-resistant dense-graded asphalt gravel layer 3 and the waterproof load transmission dense-graded asphalt mixture layer 4 respectively. And spreading an emulsified asphalt macadam seal 6 between the roadbed 1 and the waterproof fatigue-resistant dense-graded asphalt mixture layer 2. And a railway ballast gravel layer 8 covers the upper part of the waterproof load transfer dense-graded asphalt mixture layer 4, and a sleeper rail 5 is laid on the upper part of the railway ballast gravel layer 8.
[ WATER-PROOF FATIGUE-RESISTANT DEGREE MIXED MATERIALS FOR ADMIXING ASPHALT
The waterproof fatigue-resistant dense asphalt mixture layer 2 is produced by mixing SBS modified asphalt, limestone stone with the maximum grain diameter smaller than 13.2 and lime mineral powder and then heating; the method comprises the following specific steps:
the SBS modified asphalt comprises 5% of SBS modified asphalt, aggregate is limestone stone, the limestone stone with the grain size of 10-15 mm accounts for 10%, the limestone stone with the grain size of 5-10 mm accounts for 35%, the limestone stone with the grain size of 3-5 mm accounts for 40%, the limestone stone with the grain size of 0-3 mm accounts for 12%, the limestone ore powder accounts for 3%, the designed porosity is less than 2.5%, and the SBS modified asphalt is produced by adopting a heating and mixing mode. The uniaxial compression dynamic modulus of the waterproof fatigue-resistant dense-graded asphalt mixture layer 2 is 5000MPa, the bending tensile strength is 1.19MPa, and the bending tensile strength test results of the waterproof fatigue-resistant dense-graded asphalt mixture layer are shown in Table 1; as can be seen from Table 1, the bending test at 15 ℃ is carried out on the waterproof fatigue-resistant dense-graded asphalt mixture layer, and the maximum bending tensile strength of three groups of parallel test pieces is 1.33MPa, the minimum bending tensile strength is 0.96MPa, the average bending tensile strength is 1.19MPa, the average bending tensile strain can reach 0.061, and the average bending stiffness modulus is 21.3 MPa. The bending tensile strength and the strain of the waterproof fatigue-resistant dense-graded asphalt mixture layer show remarkable bending resistance, and the larger bending tensile strength and the strain ensure that the waterproof fatigue-resistant dense-graded asphalt mixture layer can effectively resist cracks generated under the action of load, and indirectly improve the fatigue crack resistance of the waterproof fatigue-resistant dense-graded asphalt mixture layer; the fatigue loading times of 400 microstrain are 30 ten thousand, wherein, the fatigue loading test result of the waterproof fatigue-resistant dense-graded asphalt mixture layer is shown as the attached figure 2, under the larger strain level of 400 microstrain, the modulus of the waterproof fatigue-resistant dense-graded asphalt mixture layer is attenuated to 1600MPa from 3800MPa, and 30 ten thousand load cycles are required. Therefore, when the waterproof fatigue-resistant dense-graded asphalt mixture layer is subjected to the repeated action of large strain load, the waterproof fatigue-resistant dense-graded asphalt mixture layer has stronger damage resistance and slower crack propagation, the reaction shows slower modulus attenuation on modulus, and the fatigue resistance is obvious; the water permeability coefficient is less than 95 ml/min.
TABLE 1 flexural tensile strength test results of waterproof fatigue-resistant dense-graded asphalt mixture layer
[ WATERPROOF PERMANENT-DEFORMATION-RESISTANT DENSITY GRADED ASPHALT CRUSH LAYER ]
The waterproof and permanent deformation resistant dense-graded asphalt crushed stone layer 3 is produced by mixing and heating No. 70 matrix asphalt, limestone stone with the maximum grain size of less than 31.5mm and lime mineral powder; the method comprises the following specific steps:
the asphalt comprises 4% of No. 70 matrix asphalt, aggregate is limestone stone, 8% of limestone stone with the particle size of 20-30 mm, 10% of limestone stone with the particle size of 15-20 mm, 14% of limestone stone with the particle size of 10-15 mm, 25% of limestone stone with the particle size of 5-10 mm, 30% of limestone stone with the particle size of 3-5 mm, 10% of limestone stone with the particle size of 0-3 mm, 3% of lime ore powder and the designed porosity of less than 3%, and the asphalt is produced by adopting a heating and mixing mode. The dynamic modulus test results of the waterproof and permanent deformation resistant dense-graded asphalt gravel layer 3 under the conditions of the uniaxial compression dynamic modulus of 10300MPa and different temperatures under 10Hz are shown in the attached figure 3, the dynamic modulus of the waterproof and permanent deformation resistant dense-graded asphalt gravel layer under different temperatures and loading frequency of 10Hz is analyzed, the dynamic modulus of 10300MPa under 20 ℃ shows performance of certain high modulus, and along with temperature increase, the dynamic modulus of the waterproof and permanent deformation resistant dense-graded asphalt gravel layer under the high temperature state can still reach about 1000MPa, so that the waterproof and permanent deformation resistant dense-graded asphalt gravel layer still has certain deformation maintaining capacity under the high temperature, and can effectively resist the combined action of temperature and load; the dynamic stability of the rutting test is 4300 times/mm, and the test result of the rutting test of the waterproof permanent deformation-resistant dense-graded asphalt gravel layer is shown in the attached figure 4; the water permeability coefficient is 98 ml/min.
[ waterproof load transfer dense-graded asphalt mixture layer ]
The waterproof load transfer dense-graded asphalt mixture layer 4 is prepared by mixing SBS modified asphalt, limestone stone with the maximum grain diameter smaller than 26.5mm and lime mineral powder and then heating; the method comprises the following specific steps:
the SBS modified asphalt comprises 4.3% of SBS modified asphalt, aggregate is limestone stone, 7% of limestone stone with the particle size of 15-25 mm, 30% of limestone stone with the particle size of 10-15 mm, 25% of limestone stone with the particle size of 5-10 mm, 20% of limestone stone with the particle size of 3-5 mm, 15% of limestone stone with the particle size of 0-3 mm, 3% of limestone ore powder and the designed porosity of less than 3%. The uniaxial compression dynamic modulus of the waterproof load transfer dense-graded asphalt mixture is 12700MPa, the dynamic modulus test result of the waterproof load transfer dense-graded asphalt mixture layer is shown in figure 5, the dynamic modulus of the waterproof load transfer dense-graded asphalt mixture layer at different temperatures and loading frequency of 10Hz is analyzed, the dynamic modulus at 20 ℃ exceeds 12000MPa, the obvious high-modulus characteristic is shown, and along with the increase of the temperature, the dynamic modulus can still reach about 2000MPa at high temperature, the capability of maintaining deformation at high temperature is proved, the common effect of temperature and load can be effectively resisted, and the load transfer effect is realized; the dynamic stability of the rut test is 3000 times/mm, and the water permeability coefficient is 95 ml/min.
[ construction method ]
S1, spreading crushed stone and emulsified asphalt on the compacted roadbed 1 to form an emulsified asphalt crushed stone seal 6;
s2, paving a waterproof fatigue-resistant dense-graded asphalt mixture layer 2 with the thickness of 50mm on the upper part of the emulsified asphalt macadam seal coat 6;
s3, compacting the waterproof fatigue-resistant dense-graded asphalt mixture layer 2, and spraying an emulsified asphalt bonding layer 7;
s4, after the emulsified asphalt bonding layer 7 is sprayed, a waterproof permanent deformation-resistant dense-graded asphalt gravel layer 3 with the thickness of 100mm is paved;
s5, compacting the waterproof and permanent deformation resistant dense-graded asphalt gravel layer 3, and spraying an emulsified asphalt bonding layer 7;
s6, after the emulsified asphalt bonding layer 7 is sprayed, a waterproof load transfer dense-graded asphalt mixture layer 4 with the thickness of 80mm is paved;
s7, transmitting the waterproof load to the dense-graded asphalt mixture layer 4, compacting, and paving a ballast gravel layer 8;
and S8, paving the sleeper 5 on the upper part of the ballast gravel layer 8.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A ballast track sealing structure based on a waterproof fatigue-resistant asphalt mixture is characterized by comprising a roadbed, wherein an emulsified asphalt macadam sealing layer is paved on the upper portion of the roadbed, a waterproof fatigue-resistant dense asphalt mixture layer is paved on the upper portion of the emulsified asphalt macadam sealing layer, a waterproof permanent deformation-resistant dense asphalt gravel layer is paved on the upper portion of the waterproof fatigue-resistant dense asphalt mixture layer, a waterproof load transfer dense asphalt mixture layer is paved on the upper portion of the waterproof permanent deformation-resistant dense asphalt gravel layer, a ballast gravel layer covers the upper portion of the waterproof load transfer dense asphalt mixture layer, and a sleeper is paved on the upper portion of the ballast gravel layer; bonding layers are respectively arranged between the waterproof fatigue-resistant dense asphalt mixture layer, the waterproof permanent deformation-resistant dense asphalt gravel layer and the waterproof load transfer dense asphalt mixture layer.
2. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1, wherein the roadbed adopts a natural or treated roadbed meeting the required bearing capacity, and the roadbed bearing capacity meets the requirement that the deflection value is less than 120(0.01 mm);
the top of the roadbed is synchronously spread with limestone wet material with the maximum grain size less than 4.75mm and emulsified asphalt and subjected to interface combination treatment.
3. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1, wherein the waterproof fatigue-resistant densely-mixed asphalt mixture layer is produced by mixing SBS modified asphalt, limestone stone with the maximum particle size of less than 13.2 and lime ore powder and then heating; the method comprises the following specific steps:
the SBS modified asphalt accounts for 5-5.5 percent;
the aggregate is limestone stone, and specifically comprises the following components:
5-10% of limestone stone with the grain diameter of 10-15 mm, 25-35% of limestone stone with the grain diameter of 5-10 mm, 30-40% of limestone stone with the grain diameter of 3-5 mm and 10-15% of limestone stone with the grain diameter of 0-3 mm;
the proportion of the lime mineral powder is 3 to 5 percent;
the design void fraction is less than 2.5%.
4. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1, wherein the waterproof permanent deformation-resistant dense-graded asphalt gravel layer is produced by mixing and heating 70# matrix asphalt, limestone stone with the maximum particle size of less than 31.5mm and limestone ore powder; the method comprises the following specific steps:
the proportion of No. 70 matrix asphalt is 4-4.2%;
the aggregate is limestone stone, and specifically comprises the following components:
5-10% of limestone stone with the particle size of 20-30 mm, 5-10% of limestone stone with the particle size of 15-20 mm, 10-15% of limestone stone with the particle size of 10-15 mm, 25-35% of limestone stone with the particle size of 5-10 mm, 30-35% of limestone stone with the particle size of 3-5 mm and 10-15% of limestone stone with the particle size of 0-3 mm;
the proportion of the lime mineral powder is 3 to 5 percent;
the design void fraction is less than 3%.
5. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1, wherein the waterproof load transfer dense-graded asphalt mixture layer is produced by mixing SBS modified asphalt, limestone stone with the maximum particle size of less than 26.5mm and lime mineral powder and then heating; the method comprises the following specific steps:
SBS pitch accounts for 4.2% -4.4%;
the aggregate is limestone stones, 5-10% of the limestone stones with the grain sizes of 15-25 mm, 30-35% of the limestone stones with the grain sizes of 10-15 mm, 25-30% of the limestone stones with the grain sizes of 5-10 mm, 20-30% of the limestone stones with the grain sizes of 3-5 mm and 10-15% of the limestone stones with the grain sizes of 0-3 mm;
the ratio of the lime mineral powder is 3-5 percent;
the design void fraction is less than 3%.
6. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1 or 3, wherein the uniaxial compression dynamic modulus of the waterproof fatigue-resistant dense-graded asphalt mixture layer is 3000MPa to 5000MPa, the bending tensile strength is 1 MPa to 1.2MPa, the number of 400 microstrain fatigue loading times is 30 ten thousand, and the water permeability coefficient is less than 100 ml/min.
7. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1 or 4, wherein the waterproof permanent deformation-resistant dense-graded asphalt gravel layer has a uniaxial compression dynamic modulus of 7000MPa to 11000MPa, a dynamic stability of a rutting test of more than 2000 times/mm, and a water permeability coefficient of less than 100 ml/min.
8. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1 or 5, wherein the uniaxial compression dynamic modulus of the waterproof load transfer dense-graded asphalt mixture layer is 8000MPa to 12000MPa, the dynamic stability of a rutting test is more than 3000 times/mm, and the water permeability coefficient is less than 100 ml/min.
9. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1, wherein the bonding layer is sprayed emulsified asphalt.
10. The ballast track closed structure based on the waterproof fatigue-resistant asphalt mixture according to claim 1, wherein the thickness of the waterproof fatigue-resistant dense-graded asphalt mixture layer is 50-70 mm, the thickness of the waterproof permanent deformation-resistant dense-graded asphalt gravel layer is 100-120 mm, and the thickness of the waterproof load transfer dense-graded asphalt mixture layer is 80 mm.
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| FR1390085A (en) * | 1964-04-23 | 1965-02-19 | Shell Int Research | Improved permanent track and process to increase the stability of its ballast |
| CN107558309A (en) * | 2017-09-26 | 2018-01-09 | 武汉理工大学 | A kind of vibration damping thermal insulation type unit plate type ballastless track structure |
| CN111270569A (en) * | 2020-02-10 | 2020-06-12 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | High-speed railway roadbed structure |
| CN113250010A (en) * | 2021-04-20 | 2021-08-13 | 东南大学 | Large-particle-size asphalt macadam flexible ballast bed and construction method thereof |
| CN113789691A (en) * | 2021-08-20 | 2021-12-14 | 山东高速基础设施建设有限公司 | Stress-compensated high-toughness asphalt pavement and construction method |
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2022
- 2022-03-11 CN CN202210242574.4A patent/CN114703701A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1390085A (en) * | 1964-04-23 | 1965-02-19 | Shell Int Research | Improved permanent track and process to increase the stability of its ballast |
| CN107558309A (en) * | 2017-09-26 | 2018-01-09 | 武汉理工大学 | A kind of vibration damping thermal insulation type unit plate type ballastless track structure |
| CN111270569A (en) * | 2020-02-10 | 2020-06-12 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | High-speed railway roadbed structure |
| CN113250010A (en) * | 2021-04-20 | 2021-08-13 | 东南大学 | Large-particle-size asphalt macadam flexible ballast bed and construction method thereof |
| CN113789691A (en) * | 2021-08-20 | 2021-12-14 | 山东高速基础设施建设有限公司 | Stress-compensated high-toughness asphalt pavement and construction method |
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