Method for renovating rail cant of ballastless track

Abstract

The invention relates to a ballastless track bottom slope renovation method which comprises the following steps: a bad track bottom slope renovation preparation stage: collecting bad track bottom slope renovation parameters, and designing a renovation angle required by a bad track bottom slope of each track bearing table according to theoretical calculation and field test; an undesirable rail cant trimming implementation stage: on the basis of not influencing other parts of the original rail structure, trimming the angle of the rail cant by adopting a rail cant trimming device according to the trimming angle of the undesirable rail cant, so that the rail bearing table descends for a certain distance on the original foundation; the maximum grinding angle of the rail cant trimming device is 3 degrees, and the poor rail cant trimming range is-1: 40 to 1: 15; and a recovery stage after finishing of the bad rail cant: recovering the rail bearing table after finishing to meet the operation requirements. The method has the advantages that a construction method for polishing and finishing the bad rail cant of the ballastless track with the blocking shoulder by adopting the profile profiling of the rail bearing table is adopted, so that the purpose of eliminating the bad influence of the bad rail cant on the shaking of a high-speed rail crane, the abnormity of a steel rail light band and the like is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of high-speed railway ballastless track structure regulation, and in particular to a ballastless track bottom slope regulation method. Background Art

[0002] The main ballastless track structures in my country include CRTSⅠ double-block ballastless track, CRTSⅡ double-block ballastless track, CRTSⅠ slab ballastless track, CRTSⅡ slab ballastless track, and CRTSⅢ slab ballastless track.

[0003] Since the main contact part between the wheel tread and the top surface of the rail has a certain slope, the rail needs to be tilted inward when the track is laid to form a transverse slope between the rail bottom and the track plane, which is the rail bottom slope. The rail bottom slope of the ballastless line can be set through the track slab support rail groove or iron pad. Except for the CRTSⅠ type slab ballastless track, which sets the rail bottom slope through the iron pad, other types of ballastless track slabs are set with rail bottom slopes during prefabrication or cast-in-place. When the foundation below the ballastless track system is deformed under the influence of external environment such as water, temperature, and train dynamic load, it may cause the track slab to deform to varying degrees, resulting in an undesirable rail bottom slope. In addition, when the track slab itself is affected by temperature differences or is located at the end of a bridge beam with a large span, warping deformation may also occur, resulting in an abnormal rail bottom slope. The long-term existence of bad track bottom slope will have an adverse impact on high-speed rail and train operation. At present, the bad track bottom slope treatment solutions include rail grinding, wedge pad filling, and track plate replacement. However, rail grinding is limited in scope and only treats the symptoms rather than the root cause; wedge pad filling changes the fastener system and is difficult to implement; track plate replacement is expensive, has a high safety risk, and requires speed limits during construction, which greatly interferes with railway transportation. In view of the above shortcomings, a new ballastless track bottom slope treatment method is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to provide a method for regulating the bottom slope of a ballastless track based on the above-mentioned deficiencies in the prior art, and to achieve the overall improvement of the bottom slope of a ballastless track by reasonably planning the preparation for the repair of the bad bottom slope of the bad track, the implementation stage of the repair of the bad bottom slope of the bad track, and the recovery stage after the repair of the bad bottom slope of the bad track.

[0005] The purpose of the present invention is achieved by the following technical solutions: A method for regulating the bottom slope of a ballastless track, characterized in that the method comprises the following steps: Preparation stage for bad rail bottom slope repair: collect bad rail bottom slope repair parameters, and design the required repair angle of the bad rail bottom slope of each rail support platform based on theoretical calculation and on-site testing; Implementation stage of bad rail bottom slope correction: on the basis of not affecting other parts of the original track structure, according to the correction angle of the bad rail bottom slope, the rail bottom slope correction device is used to correct the angle of the rail bottom slope, so that the rail bearing platform is lowered a certain distance on the original basis; The maximum grinding angle of the rail bottom slope trimming device is 3°, and the range of bad rail bottom slope trimming is -1:40 to 1:15; Restoration phase after repair of bad rail bottom slope: restore the repaired rail support platform to meet operational requirements.

[0006] The preparation stage for repairing the bad rail bottom slope includes the following steps: The rail bottom slope measurement determines the abnormal distribution of rail bottom slope and the specific mileage range, designs the angle correction scheme for the bad rail bottom slope within the mileage range, and determines the correction angles of different rail bearing platforms; Determine the mileage range of construction and improvement operations, and mark the rail supports and rail vehicle parking locations where the track bottom slope needs to be improved; Rail temperature measurement in the construction area; Remove the power railside equipment, loosen the fasteners of the two rails, lift the rails and remove the rubber pads under the rails, and move the rails inwards; The double-line power supply unit within the construction area is out of power and rail car transportation operations are carried out.

[0007] The track bottom slopes of the two rails of the line are manually measured using a track bottom slope measuring instrument. Any track bottom slope that exceeds the allowable range (1:37-1:43) is defined as a poor track bottom slope. The poor track bottom slope is trimmed to the standard track bottom slope of 1:40, setting it as the remediation target, to determine the track bottom slope trimming amount and trimming range.

[0008] The seamless line locking rail temperature detection system is used to obtain the locking temperature of the ballastless line rails in the current section. The rail internal shifting operation can only be carried out when the difference between the locking rail temperature and the locking rail temperature during laying is between -20℃ and +5℃.

[0009] The bad rail bottom slope implementation stage includes the following steps: Hoist the bad rail bottom slope repair device adjacent to the track plate; Adjust the position of the bad rail bottom slope repair device and fix the embedded sleeves of the legs and track plates; On-site grinding and washing.

[0010] According to the method for regulating the bottom slope of ballastless track as described in claim 1, it is characterized in that the specific steps of adjusting the position of the bad bottom slope repairing device during the bad bottom slope repairing implementation stage are vertical adjustment, lateral adjustment, and vertical adjustment.

[0011] The recovery phase after the bad rail bottom slope repair includes the following steps: Recycling of bad rail bottom slope repairing device; The line is restored and the power railside equipment is restored; The ballastless line was fine-tuned and the overhead line was energized; Personnel, machinery, materials and rail vehicles were evacuated from the line.

[0012] After the bad rail bottom slope is corrected, the quality evaluation is carried out. The quality evaluation criteria include static evaluation and dynamic evaluation. The static evaluation includes the rail bearing groove profile, rail bottom slope and rail bearing platform flatness after grinding; The dynamic evaluation includes the change of the position and width of the rail light band.

[0013] The advantages of the present invention are: the method overcomes the shortcomings of rail grinding, wedge pad filling, and track plate replacement to rectify the bad rail bottom slope, can achieve continuous or intermittent bad rail bottom slope rectification of ballastless track plates, and improve the running quality of high-speed train sets and the quality of rail equipment, specifically including the following aspects: First, the proposed method of trimming the bad rail bottom slope by profiling and grinding the rail bearing platform can quickly achieve the trimming of the bad rail bottom slope of the ballastless track plate, and permanently solve the adverse effects of the bad rail bottom slope on the rails and driving; Second, the bad track bottom slope repair device of the ballastless track slab involved in the construction method has a simple structure, which is convenient for operation implementation, small workload for on-site module installation, high degree of automation, high functional integration, high operation efficiency, and low cost for disease treatment; Thirdly, the method is scientific and safe, and can be applied to the repair and improvement of bad track bottom slopes of ballastless track bearing platforms with shoulders, with a wide range of adaptability. Fourthly, the method causes minimal change in the contour of the track plate track bearing platform's track groove profile, and has minimal impact on the track plate's structural strength. After grinding, there is no need for large-scale ballastless line fine-tuning and section speed limits, and there is little interference with transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the bad rail bottom slope repairing operation of the ballastless track in the present invention; Figure 2 It is a schematic diagram of the ballastless line rail inner shifting device of the present invention; Figure 3 It is a detailed dimension drawing of the rail bearing groove of the rail bearing platform of the track plate in the present invention; Figure 4 It is a parameter diagram corresponding to the repair of different bad rail bottom slopes in the present invention; Figure 5 It is a schematic diagram of the flatness detection of the rail support platform after the defective track plate is repaired in the present invention; Figure 6 This is a diagram of fastener installation after the defective track plate is repaired in the present invention; Figure 7 The present invention is a flowchart of the repair of the bad rail bottom slope of the ballastless track. DETAILED DESCRIPTION

[0015] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-7 As shown, the numbers 1-7 in the figure respectively represent: carbon steel frame 1, water tank 2, grinding module 3, control module 4, rail support platform 5, steel rail 6, ballastless track plate 7.

[0016] Example: Figure 1 As shown, the ballastless track bottom slope repair method in the embodiment involves a ballastless track plate bad track bottom slope repair device, which includes a carbon steel frame 1, a water tank 2, a grinding module 3, and a control module 4. Among them, the water tank 2 and the control module 4 are located on both sides of the carbon steel frame 1, and the grinding module 3 is located in the middle of the carbon steel frame 1 and can move forward and backward. The ballastless track plate track bottom slope repair device can eliminate the vibration effect when the grinding wheel repairs the bad track bottom slope of the rail support platform under the condition of deadweight and bolt anchoring force. The ballastless track plate bad track bottom slope repair device meets the requirements of the three ballastless track plate rail support platforms under a single steel rail in each operation. In the specific implementation, a spare grinding module 3 and a spare water source need to be placed in the rail car as an emergency; in some cases, in order to improve the tool alignment accuracy of the grinding wheel, when the laser alignment device is used to find the center of the rail support platform, it can be measured and verified by an artificial steel ruler.

[0017] like Figure 2 As shown, the ballastless track rail bottom slope treatment method of this embodiment involves a ballastless track rail inner shifting device, which is mainly composed of a main slideway carbon steel frame, a slideway connector, a spacing adjustment seat, a top rail protection block, a hydraulic cylinder flange, a rail limit block, a nylon block, etc., and provides a working surface for the bad rail bottom slope treatment of the ballastless track plate through rail inner shifting. The ballastless track rail inner shifting devices are evenly arranged on the ballastless track before and after the bad rail bottom slope repairing device of the ballastless track plate, and the number of them is determined according to the length of the shifting rail.

[0018] like Figure 4 As shown, this embodiment provides parameters for repairing bad rail bottom slopes of ballastless track plates, provides the maximum grinding depth and grinding angle required for repairing different bad rail bottom slopes to standard rail bottom slopes, and guides the arrangement of rail padding when the ballastless line is restored later. Since the rail bottom slope repair operation involves a rail vehicle, at least two pairs of legs and square timbers must be placed after the rail vehicle stops before the hoisting operation can be carried out. Considering the working safety of the grinding module and the ability to adjust the grinding wheel angle, the superelevation value of the curve section should not be too large.

[0019] like Figure 6 As shown in the figure, after the bad rail bottom slope of the rail support platform is repaired, the fastener installation should meet the requirements that the front end lower jaw of the middle part of the spring clip should not contact the insulating block, and the gap between the two should not be greater than 1mm; the spring clip torque should comply with the high-speed railway ballastless repair regulations; the gauge baffle should be tightly attached to the rail bearing groove shoulder, and the gap should not be greater than 1mm; the sum of the gaps between the rail and the insulating block, and between the insulating block and the iron pad shoulder should not be greater than 1mm.

[0020] This embodiment provides a ballastless track bottom slope repair construction process, the bad track bottom slope repair construction process is as follows Figure 7 As shown, it includes the preparation stage for repairing the bad rail bottom slope, the implementation stage for repairing the bad rail bottom slope, and the recovery stage after repairing the bad rail bottom slope.

[0021] Among them, the first stage, the preparation stage for repairing the bad rail bottom slope, specifically includes: (1.1) The rail bottom slope is measured to determine the abnormal distribution and specific mileage range of the rail bottom slope, determine the mileage range of the construction and rectification operation, and mark the rail support platform 5 and rail vehicle parking location where the rail bottom slope needs to be rectified; (1.2) Measure the rail temperature of rail 6. When the difference between the rail temperature and the designed locking temperature is between -20℃ and +5℃, the bad rail bottom slope treatment operation can be carried out; (1.3) Remove the electrical and mechanical trackside equipment, loosen the fasteners of the two rails 6, remove the rails 6 and the rubber pads under the rails, install the ballastless track rail inward shifting device, and lock the rails 6 when the gap between the two rails 6 is 2mm. Manually measure and obtain the rail bottom slope and flatness data of the rail support platform 5; (1.4) The double-line power supply unit within the construction area will be shut down and rail vehicle transportation operations will be carried out.

[0022] The second stage, the implementation stage of bad rail bottom slope repair, specifically includes: (2.1) After the railcar stops at the ballastless track marking location, the bad rail bottom slope trimming device is hoisted onto the adjacent track slab 7 through the railcar hook connection lug. During the hoisting process, manual cooperation is required to ensure that the main frame is perpendicular to the center line of the ballastless track slab 7; (2.2) The frame legs and fixed legs of the bad rail bottom slope repair device are fixed with the pre-buried sleeves of the track plate 7. The control module 4 controls the lead screw and the slide groove to move the grinding base to the rail support platform to be repaired, and then controls the grinding wheel to align with the rail support groove of the rail support platform through the remote control; (2.3) According to the rail bottom slope defects of each rail support platform of the track slab on site, adjust the grinding wheel to the appropriate dressing angle through the angle adjustment module, then grind the rail support platform and flush it at the same time; (2.4) Measure the rail groove profile, rail bottom slope and rail platform flatness after grinding.

[0023] The third stage, the recovery stage after the bad rail bottom slope is repaired, specifically includes: (3.1) After grinding is completed, the grinding wheel is returned to its original position, the frame legs and fixed legs are loosened, and the bad rail bottom slope dressing device is hoisted to the rail car and reinforced; (3.2) Install the rubber pad under the rail, reset the rail 6, remove the ballastless line rail internal shifting device, and restore the power railside equipment; (3.3) Install fasteners, measure line geometry, fine-tune ballastless lines, and energize the overhead line; (3.4) The rail vehicle carrying the bad rail bottom slope repair device leaves the construction area, and all personnel, tools and materials leave the track.

[0024] In addition, this embodiment also provides an evaluation standard for repairing the bad rail bottom slope of the rail support platform, which is applied to the quality evaluation after the repair of the bad rail bottom slope, including static evaluation and dynamic evaluation. The static evaluation includes: the rail groove profile after grinding, the rail bottom slope and the flatness of the rail support platform; the dynamic evaluation includes: the position and width change of the rail light band. The error between the rail groove profile after grinding and the profile before grinding shall not exceed 1mm, and the contour trend shall be consistent without mutations or defects; the rail bottom slope shall be controlled between 1: (X-5) and 1: (X+5); the flatness of the rail support platform after grinding shall not exceed 2mm. The positions of the light bands of the two rails shall be symmetrical and centered on the left and right, and the width of the light bands shall be between 20-30mm.

[0025] like Figure 3 The detailed drawing of the jaw dimensions of the rail support platform and rail support groove shown in the figure can be used to check the profile changes of various parts of the rail support groove after grinding through the rail support platform profile mold and feeler gauge; the rail bottom slope value before and after grinding can be manually measured by the rail bottom slope measuring instrument; the height from the four corners of the rail support platform and the two pre-buried sleeve holes to the top surface of the rail support platform before grinding can be measured by an electronic vernier caliper and a level ruler. Assuming that they are A1, A2, B1, B2, C1, and C2 respectively, and the height from the four corners of the rail support platform and the two pre-buried sleeve holes to the top surface of the rail support platform after grinding are ΔA1, ΔA2, ΔB1, ΔB2, ΔC1, and ΔC2 respectively, then the flatness is |(A1+A2+B1+B2+C1+C2)-(ΔA1+ΔA2+ΔB1+ΔB2+ΔC1+ΔC2)| / 6, as shown in Figure 2. Figure 5 shown.

[0026] The embodiment of the present application provides a method for repairing the bad track bottom slope of a ballastless track, which is easy to operate, has high working efficiency and good repair accuracy, but is only suitable for situations where the structure of the track slab support platform is relatively good. When the track slab support platform is falling off or severely damaged, it is recommended to adopt plate replacement or other repair solutions.

[0027] During the specific implementation of this embodiment: the maximum grinding depth of the track support platform is mainly determined by two factors: the design value from the bottom of the track groove to the track bed slab surface, and the design value from the bottom of the track groove to the upper steel bar. The design value from the bottom of the track groove to the track bed slab of the SK-II double-block type is 26mm, and the design value from the bottom of the track groove to the upper steel bar is 34mm. The design value from the bottom of the track groove to the track bed slab of the CRTSII type plate is 22mm, and the design value from the bottom of the track groove to the upper steel bar is 92mm. The design value from the bottom of the track groove to the track bed slab of the CRTSIII type plate is 22mm, and the design value from the bottom of the track groove to the upper steel bar is 60mm. The thickness of the steel bar protective layer is 20mm. Considering that other parts of the original track structure are not affected, the track support platform structure is reduced by a maximum of 40mm on the original basis.

[0028] For operational safety, the maximum grinding amount D is 35mm. At the same time, when the minimum number of spikes is 4.152, the embedded sleeve anti-pullout test meets the TBT 3395.5-2015 standard, and the fastener combination fatigue test meets the TBT 3396.4-2015 standard. The maximum grinding angle of the rail bottom slope dressing device is 3°, the length L of the track plate support platform is 319mm, when the bad rail bottom slope is repaired from -1:40 to 1:40, the maximum grinding depth is 16mm, and the grinding wheel rotation angle is 2.86°, when the bad rail bottom slope is repaired from -1:40 to 1:40, the maximum grinding depth is 16mm, and the grinding wheel rotation angle is 2.86°, when the bad rail bottom slope is repaired from 1:15 to 1:40, the maximum grinding depth is 13.3mm, and the grinding wheel rotation angle is 2.39°, considering the grinding depth and grinding angle, the reasonable treatment range of the bad rail bottom slope is -1:40 to 1:15.

[0029] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A method for regulating the bottom slope of a ballastless track, characterized in that: The remediation method includes the following steps: Preparation stage for bad rail bottom slope repair: collect bad rail bottom slope repair parameters, and design the required repair angle of the bad rail bottom slope of each rail support platform based on theoretical calculation and on-site testing; Implementation stage of bad rail bottom slope correction: on the basis of not affecting other parts of the original track structure, according to the correction angle of the bad rail bottom slope, the rail bottom slope correction device is used to correct the angle of the rail bottom slope, so that the rail bearing platform is lowered a certain distance on the original basis; The maximum grinding angle of the rail bottom slope trimming device is 3°, and the range of bad rail bottom slope trimming is -1:40 to 1:15; Restoration phase after repair of bad rail bottom slope: restore the repaired rail support platform to meet operational requirements.

2. The method for regulating the bottom slope of a ballastless track according to claim 1, characterized in that: The preparation stage for repairing the bad rail bottom slope includes the following steps: The rail bottom slope measurement determines the abnormal distribution of rail bottom slope and the specific mileage range, designs the angle correction scheme for the bad rail bottom slope within the mileage range, and determines the correction angles of different rail bearing platforms; Determine the mileage range of construction and improvement operations, and mark the rail supports and rail vehicle parking locations where the track bottom slope needs to be improved; Rail temperature measurement in the construction area; Remove the power railside equipment, loosen the fasteners of the two rails, lift the rails and remove the rubber pads under the rails, and move the rails inwards; The double-line power supply unit within the construction area is out of power and rail car transportation operations are carried out.

3. The method for regulating the bottom slope of a ballastless track according to claim 2, characterized in that: The track bottom slopes of the two rails of the line are manually measured using a track bottom slope measuring instrument. Any track bottom slope that exceeds the allowable range (1:37-1:43) is defined as a poor track bottom slope. The poor track bottom slope is trimmed to the standard track bottom slope of 1:40, setting it as the remediation target, to determine the track bottom slope trimming amount and trimming range.

4. The method for regulating the bottom slope of a ballastless track according to claim 2, characterized in that: The seamless line locking rail temperature detection system is used to obtain the locking temperature of the ballastless line rails in the current section. The rail internal shifting operation can only be carried out when the difference between the locking rail temperature and the locking rail temperature during laying is between -20℃ and +5℃.

5. The method for regulating the bottom slope of a ballastless track according to claim 1, characterized in that: The bad rail bottom slope implementation stage includes the following steps: Hoist the bad rail bottom slope repair device adjacent to the track plate; Adjust the position of the bad rail bottom slope repair device and fix the embedded sleeves of the legs and track plates; On-site grinding and washing.

6. The method for regulating the bottom slope of a ballastless track according to claim 5, characterized in that: According to the method for regulating the bottom slope of ballastless track as described in claim 1, it is characterized in that the specific steps of adjusting the position of the bad bottom slope repairing device during the bad bottom slope repairing implementation stage are vertical adjustment, lateral adjustment, and vertical adjustment.

7. The method for regulating the bottom slope of a ballastless track according to claim 1, characterized in that: The recovery phase after the bad rail bottom slope repair includes the following steps: Recycling of bad rail bottom slope repairing device; The line is restored and the power railside equipment is restored; The ballastless line was fine-tuned and the overhead line was energized; Personnel, machinery, materials and rail vehicles were evacuated from the line.

8. The method for regulating the bottom slope of a ballastless track according to claim 1, characterized in that: After the bad rail bottom slope is corrected, the quality evaluation is carried out. The quality evaluation criteria include static evaluation and dynamic evaluation. The static evaluation includes the rail bearing groove profile, rail bottom slope and rail bearing platform flatness after grinding; The dynamic evaluation includes the change of the position and width of the rail light band.

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