Construction method for ballastless track of steel base plate rail bearing table type

Abstract

The invention discloses a construction method for a ballastless track of a steel base plate bearing rail table type. The construction method comprises the following steps: collecting midline mileage data of a double-block sleeper on site, synchronously widening a transition area track bed, determining the geometric dimension of a steel base plate, carrying out in-plant finish machining, synchronously arranging the steel base plate bearing rail table, calculating coordinates and carrying out on-site lofting. Drilling a track bed in the transition area and arranging a track bearing table; shifting and connecting steel rails in a transition area; track fine adjustment and operation maintenance; the steel rail is shifted back to a main line; dismantling the temporary line; repairing the existing ballast bed and the waterproof layer; the invention relates to the technical field of railways. The method solves the problem that a ballastless track structure is difficult and complex to access a new line.

Description

Technical Field

[0001] The invention relates to the technical field of railways, and in particular to a construction method of a steel pad rail-bearing table type ballastless track. Background Art

[0002] When renovating railway stations or repairing some railway defects, it is often necessary to temporarily connect new tracks based on existing tracks. For ballasted tracks, the track splicing method can be used to manually and mechanically adjust the existing track and ballast bed linearly to connect them with the new tracks. For ballastless tracks, since the ballast bed structure is a rigid structure and is tightly connected to the offline structure, it is a locked structure in both horizontal and vertical directions, and the track line shape cannot be directly adjusted.

[0003] Usually, the connection of ballastless track to a new track requires the existing ballastless trackbed reinforced concrete structure to be broken down for a certain length, and then it is changed to a ballasted trackbed for connection. This process not only has a long implementation period and is difficult to construct, but also damages the existing ballastless trackbed structure. It is neither economical nor conducive to safety and quality control, and its shortcomings are very obvious. Summary of the invention

[0004] In order to solve the problem that it is difficult and complicated to connect a ballastless track structure to a new line, the purpose of the present invention is to provide a steel pad rail-bearing platform type ballastless track construction method.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: a steel pad rail support table type ballastless track construction method, comprising the following steps:

[0006] S1, collect the centerline mileage data of the double-block sleepers on site and simultaneously widen the transition zone trackbed;

[0007] S2, determine the geometric dimensions of the steel pad, perform fine processing in the factory, simultaneously lay out the steel pad rail platform, calculate the coordinates and lay out on site;

[0008] S3, drilling holes in the transition zone ballast to set up rail bearing platforms;

[0009] S4, rail connection in transition area;

[0010] S5, track fine-tuning and operation and maintenance;

[0011] S6, return the rails to the main line;

[0012] S7, dismantle temporary lines;

[0013] S8, repair the existing roadbed and waterproofing layer;

[0014] S9, fine-tune the line to resume normal traffic.

[0015] Preferably, for the widened transition zone ballast bed in S1, the outer shoulder sealing layer of the existing ballastless track is milled on the surface, anchor pins are drilled in the surface layer of the ballast bed, and steel bars are drilled on the side of the existing track structure to strengthen the connection, a geotextile isolation layer is laid on the side of the existing ballast bed, and a C40 reinforced concrete widened ballast bed is poured on the outer side of the existing ballast bed according to the position of the temporary track, a temporary track transition connection foundation is set, and the widened section of the transition zone ballast bed is determined according to the line shape of the inserted track.

[0016] Preferably, in S1, S2 and S3, positioning drilling is performed on the surface of the existing ballast and the newly widened ballast according to the position of the auxiliary line, and the drilling holes on the surface of the existing ballast should be located between the double-block sleepers;

[0017] A. Due to the construction error of the embedded sleepers in the existing double-block ballastless track ballast bed, the accumulated longitudinal spacing error may affect the layout of the rail support platform; therefore, it is necessary to first collect the centerline mileage data of the double-block sleepers on site, lay out the plane position of the steel pad rail support platform according to the actual mileage and the line position of the inserted track, determine the coordinates of the anchor bolts according to the plane position of the rail support platform structure, and organize on-site layout;

[0018] B. To ensure that the anchor bolts have a good fixing effect on the rail support structure and ensure the track structure accuracy during train operation, the anchor bolts use φ24 high-strength stainless steel screws, φ28 holes are reserved at the four corners of the rail support steel plate, and the track bed plate is drilled with a φ30 water-grinding drill. Due to the extremely high construction accuracy, the control of measurement errors is very important. The tooling fitting method is used in the construction project to reduce the construction error. The specific operations are as follows:

[0019] a. According to the geometric dimensions of the rail support platform, a 10mm thick steel plate positioning fixture is processed. The bolt holes of the fixture are concentric with the four corners of the rail support platform steel plate and have a diameter of 30mm. A round steel handle is welded on one side of the fixture to facilitate the positioning and displacement of the fixture. The center line of the bolt holes at the four corners of the fixture and its extension line are engraved on the fixture using laser engraving technology;

[0020] b. Use a high-precision total station and CPI II control points to lay out the center position of the anchor bolts of the rail platform on the ballast plate, use ink lines to connect the measurement and layout points, and compare and fit the tooling hole line position with the layout point ink line. If the fitting error Dd exceeds 4mm, it is necessary to use the total station again to lay out the four holes until the fitting error is less than 4mm. When the fitting errors of the four corners are qualified, fix the tooling position, use the tooling hole position as the guide hole, use a water-grinding drill to drill the ballast plate to the designed depth, remove the tooling, install the steel plate under the rail platform after cleaning the hole, implant a sufficient amount of rebar glue into the hole, and insert the stainless steel anchor screw;

[0021] c. Steel plate processing. The key to the success of steel plate bearing rail table ballastless track construction is not only the position accuracy control of the anchor bolts, but also the processing accuracy of the steel plate;

[0022] d.Ⅰ. Re-arrange the rail support structure according to the center mileage of the double-block ballastless track sleepers actually collected on site, strictly control the position relationship between various structures, and prevent conflicts;

[0023] e.Ⅱ. Number the rail bearing platforms, and determine the geometric dimensions of each steel pad according to the layout plan, including the length A of the steel pad, the center distance B of the four corner bolt holes, the eccentricity e between the fastener fixing bolt hole and the center line of the steel pad, and the eccentricity D between the center line of the fastener fixing bolt and the center line of the steel pad. Use data fitting methods to reduce the number of e values ​​as much as possible, thereby reducing the types of steel pad processing. Laser cutting technology is required for steel pad processing to ensure that the processing accuracy is controlled within the range of ±1mm.

[0024] Preferably, in S4, after removing the main line rails, install the steel plate on the rail support platform, fix the rail support platform to the drilled position on the surface of the ballast bed by chemical anchor bolts, lay WJ-7 type special adjustment fasteners on the rail support platform, lock the rails by WJ-7 type special adjustment fasteners, and perform geometric shape and position arrangement on the rail surface to complete the new line connection. WJ-8 type special adjustment fasteners are used before and after the transition zone of the existing main line to raise the slope, and the bottom of the rail in the transition section after the slope should be higher than the existing double-block sleeper shoulder by at least 5mm.

[0025] Preferably, in S5, after the connection is completed, the new line in operation needs to be tested, and the train can only be operated after the driving conditions are met. During the operation of the train, the track structure should be checked regularly and the track geometry should be sorted out.

[0026] Preferably, in S6, after the new line is used, the rails are returned to the main line, the rail surface condition is tidied, and the line continues to run at a speed within the construction period.

[0027] Preferably, in S7, the new rails, fasteners, rail supports and the outer widened ballast bed in the transition zone are removed, and attention is paid to protecting the existing ballast bed during the removal process.

[0028] Preferably, in S8, the drilled holes on the existing ballast slab in the transition zone are covered, and the damaged ballast slab and the waterproof layer between the tracks are repaired.

[0029] Preferably, in S9, after the track bed repair is completed and meets the strength requirements, the line is fine-tuned, and after the fine-tuning is completed, it needs to be tested, and according to the test results, the line is gradually put into operation at a high speed according to relevant management measures.

[0030] Compared with the prior art, the present invention achieves the following beneficial effects: the present invention solves the difficulty of connecting the ballastless track structure to the new line without destroying the existing ballastless track bed, and achieves minimum interference with the passage of trains on the operating line, optimal control of safety risks, efficient guarantee of construction quality, and low investment in construction operation and maintenance costs throughout the construction process, which has good guiding significance for the construction of similar projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0032] Figure 1 It is a schematic diagram of the construction method process of the present invention;

[0033] Figure 2 It is a structural schematic diagram of the rail support platform of the present invention;

[0034] Figure 3 It is a schematic structural diagram of the transition zone ballast of the present invention;

[0035] Figure 4 It is a schematic structural diagram of a top view of the transition zone ballast of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the 10 mm steel plate positioning tool of the present invention;

[0037] Figure 6 It is a structural schematic diagram of the steel plate positioning tooling of the present invention for measuring and setting out points;

[0038] Figure 7 It is a structural schematic diagram of the steel pad of the present invention. DETAILED DESCRIPTION

[0039] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0040] See also Figures 1 to 4. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0041] The present invention provides a technical solution: a steel pad rail-bearing table-type ballastless track construction method, comprising the following steps:

[0042] S1, collect the centerline mileage data of the double-block sleepers on site and simultaneously widen the transition zone trackbed;

[0043] S2, determine the geometric dimensions of the steel pad, perform fine processing in the factory, simultaneously lay out the steel pad rail platform, calculate the coordinates and lay out on site;

[0044] S3, drilling holes in the transition zone ballast to set up rail bearing platforms;

[0045] S4, rail connection in transition area;

[0046] S5, track fine-tuning and operation and maintenance;

[0047] S6, return the rails to the main line;

[0048] S7, dismantle temporary lines;

[0049] S8, repair the existing roadbed and waterproofing layer;

[0050] S9, fine-tune the line to resume normal traffic.

[0051] The widened transition zone ballast bed in S1 is to perform surface milling treatment on the outer shoulder sealing layer of the existing ballastless track, drill holes in the surface layer of the ballast bed and implant anchor pins, drill holes in the side of the existing track structure and implant steel bars to strengthen the connection, lay a geotextile isolation layer on the side of the existing ballast bed, cast C40 reinforced concrete widened ballast bed on the outer side of the existing ballast bed according to the position of the temporary track, set the temporary track transition connection foundation, and the widened section of the transition zone ballast bed is determined according to the line shape of the inserted track.

[0052] In S1, S2 and S3, positioning holes are drilled on the surface of the existing ballast and the newly widened ballast according to the position of the auxiliary line. The holes drilled on the surface of the existing ballast should be located between the double-block sleepers.

[0053] A. Due to the construction error of the embedded sleepers in the existing double-block ballastless track ballast bed, the accumulated longitudinal spacing error may affect the layout of the rail support platform; therefore, it is necessary to first collect the centerline mileage data of the double-block sleepers on site, lay out the plane position of the steel pad rail support platform according to the actual mileage and the line position of the inserted track, determine the coordinates of the anchor bolts according to the plane position of the rail support platform structure, and organize on-site layout;

[0054] B. To ensure that the anchor bolts have a good fixing effect on the rail support structure and ensure the track structure accuracy during train operation, the anchor bolts use φ24 high-strength stainless steel screws, φ28 holes are reserved at the four corners of the rail support steel plate, and the track bed plate is drilled with a φ30 water-grinding drill. Due to the extremely high construction accuracy, the control of measurement errors is very important. The tooling fitting method is used in the construction project to reduce the construction error. The specific operations are as follows:

[0055] a. According to the geometric dimensions of the rail support platform, a 10mm thick steel plate positioning fixture is processed. The bolt holes of the fixture are concentric with the four corners of the rail support platform steel plate and have a diameter of 30mm. A round steel handle is welded on one side of the fixture to facilitate the positioning and displacement of the fixture. The center line of the bolt holes at the four corners of the fixture and its extension line are engraved on the fixture using laser engraving technology;

[0056] b. Use a high-precision total station and CPI II control points to lay out the center position of the anchor bolts of the rail platform on the ballast plate, use ink lines to connect the measurement and layout points, and compare and fit the tooling hole line position with the layout point ink line. If the fitting error Dd exceeds 4mm, it is necessary to use the total station again to lay out the four holes until the fitting error is less than 4mm. When the fitting errors of the four corners are qualified, fix the tooling position, use the tooling hole position as the guide hole, use a water-grinding drill to drill the ballast plate to the designed depth, remove the tooling, install the steel plate under the rail platform after cleaning the hole, implant a sufficient amount of rebar glue into the hole, and insert the stainless steel anchor screw;

[0057] c. Steel plate processing. The key to the success of steel plate bearing rail table ballastless track construction is not only the position accuracy control of the anchor bolts, but also the processing accuracy of the steel plate;

[0058] d.Ⅰ. Re-arrange the rail support structure according to the center mileage of the double-block ballastless track sleepers actually collected on site, strictly control the position relationship between various structures, and prevent conflicts;

[0059] e.Ⅱ. Number the rail bearing platforms, and determine the geometric dimensions of each steel pad according to the layout plan, including the length A of the steel pad, the center distance B of the four corner bolt holes, the eccentricity e between the fastener fixing bolt hole and the center line of the steel pad, and the eccentricity D between the center line of the fastener fixing bolt and the center line of the steel pad. Use data fitting methods to reduce the number of e values ​​as much as possible, thereby reducing the types of steel pad processing. Laser cutting technology is required for steel pad processing to ensure that the processing accuracy is controlled within the range of ±1mm.

[0060] In S4, after removing the main line rails, install the steel plate on the rail support, fix the rail support to the drilled position on the surface of the ballast bed by chemical anchor bolts, lay WJ-7 type special adjustment fasteners on the rail support, lock the rails by WJ-7 type special adjustment fasteners, and perform geometric shape and position arrangement on the rail surface to complete the new line connection. WJ-8 type special adjustment fasteners are used before and after the transition area of ​​the existing main line to raise the slope. After the slope, the bottom of the rail in the transition section should be higher than the existing double-block sleeper shoulder by at least 5mm.

[0061] In S5, after the connection is completed, the new line needs to be tested and can only be operated after the driving conditions are met. During the operation of the train, the track structure should be checked regularly and the track geometry should be sorted out.

[0062] In S6, after the new line is used, the rails are returned to the main line, the rail surface state is adjusted, and the line continues to run at a speed within the construction period.

[0063] In S7, the new rails, fasteners, rail supports and the widened ballast bed on the outer side of the transition zone are removed, and attention is paid to protecting the existing ballast bed during the removal process.

[0064] In the above S8, the drilled holes on the existing ballast plate in the transition zone are covered, and the damaged ballast plate and the waterproof layer between the tracks are repaired.

[0065] In S9, after the track bed is repaired and meets the strength requirements, the line is fine-tuned. After the fine-tuning is completed, it needs to be tested. Based on the test results, the line is gradually put into operation at full speed in accordance with relevant management measures.

[0066] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

Claims

1. A method for constructing a steel plate rail-bearing table-type ballastless track, characterized in that: The following steps are included: S1, collect the centerline mileage data of the double-block sleepers on site and simultaneously widen the transition zone trackbed; S2, determine the geometric dimensions of the steel pad, perform fine processing in the factory, simultaneously lay out the steel pad rail platform, calculate the coordinates and lay out on site; S3, drilling holes in the transition zone ballast to set up rail bearing platforms; S4, rail connection in transition area; S5, track fine-tuning and operation and maintenance; S6, return the rails to the main line; S7, dismantle temporary lines; S8, repair the existing roadbed and waterproofing layer; S9, fine-tune the line to resume normal traffic.

2. The method for constructing a steel plate rail-bearing table-type ballastless track according to claim 1, characterized in that: For the widened transition zone ballast bed in S1, the outer shoulder sealing layer of the existing ballastless track is milled on the surface, anchor pins are drilled in the surface layer of the ballast bed, and steel bars are drilled in the side of the existing track structure to strengthen the connection. A geotextile isolation layer is laid on the side of the existing ballast bed, and a C40 reinforced concrete widened ballast bed is poured on the outer side of the existing ballast bed according to the position of the temporary track. A temporary track transition connection foundation is set, and the widened section of the transition zone ballast bed is determined according to the line shape of the inserted track.

3. The method for constructing a steel plate rail-bearing table-type ballastless track according to claim 2, characterized in that: In S1, S2 and S3, positioning holes are drilled on the surface of the existing ballast and the newly widened ballast according to the position of the auxiliary line. The holes drilled on the surface of the existing ballast should be located between the double-block sleepers. A. Due to the construction error of the embedded sleepers in the existing double-block ballastless track ballast bed, the accumulated longitudinal spacing error may affect the layout of the rail support platform; therefore, it is necessary to first collect the centerline mileage data of the double-block sleepers on site, lay out the plane position of the steel pad rail support platform according to the actual mileage and the line position of the inserted track, determine the coordinates of the anchor bolts according to the plane position of the rail support platform structure, and organize on-site layout; B. To ensure that the anchor bolts have a good fixing effect on the rail support structure and ensure the track structure accuracy during train operation, the anchor bolts use φ24 high-strength stainless steel screws, φ28 holes are reserved at the four corners of the rail support steel plate, and the track bed plate is drilled with a φ30 water-grinding drill. Due to the extremely high construction accuracy, the control of measurement errors is very important. The tooling fitting method is used in the construction project to reduce the construction error. The specific operations are as follows: a. According to the geometric dimensions of the rail support platform, a 10mm thick steel plate positioning fixture is processed. The bolt holes of the fixture are concentric with the four corners of the rail support platform steel plate and have a diameter of 30mm. A round steel handle is welded on one side of the fixture to facilitate the positioning and displacement of the fixture. The center line of the bolt holes at the four corners of the fixture and its extension line are engraved on the fixture using laser engraving technology; b. Use a high-precision total station and CPIII control points to lay out the center position of the anchor bolts of the rail platform on the ballast plate, use ink lines to connect the measurement points, and compare and fit the tooling hole positions with the ink lines of the layout points. If the fitting error Dd exceeds 4mm, it is necessary to use the total station again to lay out the four hole positions until the fitting error is less than 4mm; When the fitting errors of the four corners are qualified, fix the position of the tooling, use the tooling hole as the guide hole, use a water drill to drill the roadbed plate to the designed depth, remove the tooling, install the steel plate under the rail support platform after cleaning the hole, implant a sufficient amount of rebar glue into the hole, and insert the stainless steel anchor screw; c. Steel plate processing. The key to the success of steel plate bearing rail table ballastless track construction is not only the position accuracy control of the anchor bolts, but also the processing accuracy of the steel plate; d.Ⅰ. Re-arrange the rail support structure according to the center mileage of the double-block ballastless track sleepers actually collected on site, strictly control the position relationship between various structures, and prevent conflicts; e.Ⅱ. Number the rail bearing platforms, and determine the geometric dimensions of each steel pad according to the layout plan, including the length A of the steel pad, the center distance B of the four corner bolt holes, the eccentricity e between the fastener fixing bolt hole and the center line of the steel pad, and the eccentricity D between the center line of the fastener fixing bolt and the center line of the steel pad. Use data fitting methods to reduce the number of e values ​​as much as possible, thereby reducing the types of steel pad processing. Laser cutting technology is required for steel pad processing to ensure that the processing accuracy is controlled within the range of ±1mm.

4. The method for constructing a steel plate rail-bearing table-type ballastless track according to claim 1, characterized in that: In S4, after removing the main line rails, a steel plate is installed on the track support platform, the track support platform is fixed to the drilled position on the ballast surface by chemical anchor bolts, WJ-7 special adjustment fasteners are laid above the track support platform, the rails are locked by the WJ-7 special adjustment fasteners, and the rail surface is geometrically arranged to complete the new line connection. WJ-8 special adjustment fasteners are used before and after the transition zone of the existing main line to raise the slope. After the slope, the bottom of the rail in the transition section should be at least 5mm higher than the existing double-block sleeper shoulder.

5. The method for constructing a steel plate rail-bearing table type ballastless track according to claim 4, characterized in that: In S5, after the connection is completed, the new line needs to be tested and can only be operated after meeting the driving conditions. During the train operation, the track structure must be checked regularly and the track geometry must be sorted out.

6. The method for constructing a steel plate rail-bearing table type ballastless track according to claim 5, characterized in that: In S6, after the new line is used, the rails are returned to the main line, the rail surface is tidied up, and the line continues to run at a speed within the construction period.

7. The method for constructing a steel plate rail-bearing table type ballastless track according to claim 6, characterized in that: In S7, the new rails, fasteners, rail supports and the outer widened ballast in the transition zone are removed, and attention is paid to protecting the existing ballast during the removal process.

8. The method for constructing a steel plate rail-bearing table type ballastless track according to claim 7, characterized in that: In the above S8, the cover of the drilled holes on the existing ballast plate in the transition zone is repaired, and the damaged ballast plate and the waterproof layer between the lines are repaired.

9. The method for constructing a steel plate rail-bearing table-type ballastless track according to claim 1, characterized in that: In S9, after the track bed is repaired and meets the strength requirements, the line is fine-tuned. After the fine-tuning is completed, it needs to be tested. Based on the test results, the line is gradually put into operation at full speed in accordance with relevant management measures.

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