Existing high-speed railway ballastless track settlement disease treatment method

Abstract

The invention provides an existing high-speed railway ballastless track settlement disease treatment method which comprises the following steps: firstly, determining the lifting amount of a ballastless track and the arrangement position of a sectional type expandable bag body, then manufacturing the sectional type expandable bag body, performing curve drilling operation in a subgrade bed by taking the side surface of an embankment as a starting point, and taking the sectional type expandable bag body as the starting point. After the segmented expandable bag body is bundled to the minimum diameter and placed in the drill hole, grouting and lifting are conducted on the segmented expandable bag body; and in the grouting process, the deformation conditions of the roadbed bed and the ballastless track are monitored in real time, grouting is stopped after the concrete roadbed slab reaches the preset lifting height, the deformation conditions of the ballastless track continue to be monitored and detected again, and finally the treatment operation of the settlement disease is completed. The method has the advantages of being easy to construct, flexible in arrangement, high in lifting efficiency and low in treatment cost, and refined treatment lifting of the uneven settlement disease of the ballastless track is achieved on the premise that the track structure is not damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of railway settlement control methods, and specifically relates to a method for controlling settlement defects of an existing high-speed railway ballastless track. Background Art

[0002] Most of the existing high-speed railway tracks are ballastless track structures. Under the influence of multiple factors such as long-term traffic loads and deterioration of geological conditions, they are prone to problems such as reduced bearing capacity of the subgrade and uneven settlement of the track structure. The current railway line design specifications have very strict requirements on the settlement and deformation of the ballastless track subgrade, especially the uneven settlement. The allowable adjustment of the subgrade settlement during operation is only 15mm, and the allowable uneven settlement at the connection between different structures is only 5mm. At present, some of my country's operating high-speed railway lines have experienced uneven settlement that exceeds the requirements of the high-speed railway design specifications, which has seriously affected the safety, comfort and transportation efficiency of high-speed railway operations. Therefore, how to control the uneven settlement of ballastless tracks while ensuring the normal operation of existing high-speed railways is one of the key issues that need to be urgently solved in the current high-speed railway field.

[0003] The common methods for dealing with uneven settlement of ballastless tracks can be roughly divided into the following categories:

[0004] 1) The track smoothness and settlement can be adjusted by adjusting the fastener system, but the adjustment range of the fastener system is limited. When the settlement of a local section exceeds the allowable adjustment range of the fastener system, the only option is to limit the train speed. Moreover, this adjustment method is difficult to guarantee its long-term effectiveness under the influence of train running loads.

[0005] 2) The ballastless track is lifted by using polymer foam materials to treat the settlement disease. The polymer foam materials are injected into the graded crushed stone under the track slab support layer through drilling holes in the track slab, and the track slab is lifted by utilizing the expansion of the foam materials.

[0006] After searching, the invention patent with patent application number 201710013063.4 discloses a method for lifting and correcting the grouting of ballastless track, which uses a combination of polymer bags and jacks to achieve the lifting and correction of ballastless track. Although this method limits the spread of injected slurry in the supporting layer through polymer bags, it is necessary to cut and drill holes in the closed layer and track plate to achieve this, which causes great damage to the roadbed structure and track structure, and it is difficult to ensure the lifting effect during the drilling and grouting process.

[0007] After searching, the invention patent with patent application number 202111106080.5 discloses a high-speed railway ballastless track settlement bag grouting and lifting repair method. By calculating the relationship between the lifting force and the expansion force of polyurethane, expandable polyurethane is injected into the grouting bag tube to lift the track plate to a predetermined elevation. Although this method ensures the integrity of the track structure, the grouting bag is close to the track structure, and it is difficult to accurately control the lifting amount during the grouting process. It can only be lifted at one point above it, and it is impossible to achieve the treatment of long-distance ballastless track settlement diseases. The comprehensive treatment cost is high and the construction is complicated.

[0008] This method is difficult to achieve accurate lifting of ballastless track due to the fast reaction speed of polymer foam materials, high requirements for the surrounding environment, low controllability of expansion pressure, expansion degree and impact range during use; and it is easy to pollute the embankment and its pipeline accessories during the reaction and expansion process; at the same time, it is necessary to drill holes on the top of the track plate to open the grouting channel, which is easy to damage the track structure. Therefore, its implementation at the engineering level has certain limitations.

[0009] (3) Use mechanical equipment to lift the ballastless track. That is, after the ballastless track settles, use mechanical equipment to lift the track plate structure including the concrete roadbed plate and the base plate to a predetermined elevation, inject flexible grouting material between the base plate and the surface of the roadbed, and drop the track plate after the material solidifies to achieve the treatment of ballastless track settlement. In this method, the flexible grouting material has poor durability and high cost, and there is a problem of foaming when it comes into contact with water, so it cannot be used in a water environment; and because the longitudinal bending strength of the track plate structure is low, it is easy to cause tensile damage to the track plate structure during the process of mechanically lifting and dropping the track plate structure, and the technical implementation is difficult.

[0010] Based on this, a method for treating settlement damage of existing ballastless track of high-speed railway is proposed. Summary of the invention

[0011] The technical problem to be solved by the present invention is to provide a method for treating settlement defects of ballastless tracks of existing high-speed railways in view of the deficiencies of the above-mentioned prior art, so as to solve the problems raised in the above-mentioned background technology.

[0012] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for treating the settlement disease of an existing high-speed railway ballastless track, comprising the following steps:

[0013] S1. Determine the lifting amount of the ballastless track and the layout position of the segmented expandable bladder;

[0014] Use a high-precision level to inspect the ballastless track, determine the amount of ballastless track lift based on the measurement results, and determine the placement position of the segmented expandable bladders used;

[0015] S2, making a segmented expandable bladder;

[0016] Make and inspect the integrity and compactness of the segmented expandable bladders, and determine the number, length, burial position and burial depth parameters of the segmented expandable bladders according to the ballastless track lifting amount determined in S1;

[0017] S3, drilling operation;

[0018] Curved drilling is performed in the roadbed starting from the side of the embankment, and the drilling depth is consistent with the preset burial depth of the segmented expandable bladder;

[0019] S4, tying the expandable bladder;

[0020] Bundle the segmented expandable bladder to the minimum diameter to ensure that the bundling material can maintain the shape of the expandable bladder before grouting and does not affect the expansion of the bladder during the grouting process;

[0021] S5, segmented expandable bladder grouting and lifting;

[0022] The grouting connection end and the plugging end are respectively installed and connected with the segmented expandable bladder, and then the installed segmented expandable bladder is placed in the drilled hole of the roadbed subgrade; a segmented grouting pipe is arranged in the segmented expandable bladder, and the segmented grouting pipe is connected to the grouting equipment through a grouting main pipe, and grouting equipment is used to inject slurry into the segmented expandable bladder. During the grouting process, the deformation of the concrete roadbed slab, the concrete base slab and the roadbed subgrade is monitored in real time, and the grouting is stopped after the concrete roadbed slab reaches a preset lifting height;

[0023] S6, grouting pipe removal;

[0024] After the concrete slab is lifted to the preset height, the grouting pipe is removed, the grouting connection end is sealed, the deformation of the concrete slab is continuously monitored, and the track geometry is rechecked to complete the settlement disease control operation.

[0025] As a further illustration of the present invention, the surface material of the segmented inflatable bladder is made of a high-strength elastic material with an embedded anti-tensile reinforcement mesh, and the compressive strength of the segmented inflatable bladder is greater than 2 MPa.

[0026] As a further illustration of the present invention, the segmented inflatable bladder is also provided with an anti-scratch felt outside.

[0027] As a further explanation of the present invention, the two ends of the segmented expandable bladder are connecting ends, and the connecting ends of the segmented expandable bladder are provided with spiral connecting ends, and the spiral connecting ends are provided with grouting holes.

[0028] As a further illustration of the present invention, the drilling direction of the curved drilling path in S3 is parallel to the traveling direction of the track.

[0029] As a further illustration of the present invention, the segmented expandable bladder in S4 can be bundled to a minimum diameter of 6-10 cm, and the maximum diameter of the segmented expandable bladder after grouting and expansion is in the range of 20-40 cm.

[0030] As a further explanation of the present invention, the adjacent segmented expandable bladders and the grouting connection ends and the sealing ends are fixed to each other using throat clamps, and epoxy resin is used to seal and waterproof the gaps between the segmented expandable bladders and the grouting connection ends and the sealing ends.

[0031] As a further illustration of the present invention, the slurry is a slow-setting cement slurry.

[0032] As a further illustration of the present invention, the grouting pressure of the grouting equipment is between 0.2 and 0.4 MPa.

[0033] As a further illustration of the present invention, the segmented expandable bladder in S1 is arranged in the lower roadbed between the sleepers on both sides.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. The present invention adopts the active control technology of segmented expandable bladder grouting, flexibly arranges the segmented expandable bladder under the track sleeper structure, and realizes accurate treatment of settlement disease parts by controlling the grouting amount of the segmented expandable bladder at different positions. The expansion force generated by the bladder after grouting is used to squeeze and lift the surrounding soil, and compensate for the uneven settlement of the roadbed and ballastless track. During the lifting process, the deformation of the position to be treated is monitored in real time. After the concrete roadbed plate is lifted to a preset position, the grouting is stopped to ensure the displacement control accuracy, and the uneven settlement of the roadbed and ballastless track can be treated within a long mileage range.

[0036] 2. The present invention has the advantages of simple construction, flexible layout, high lifting efficiency and low treatment cost, and avoids the pollution of the surrounding soil by the slurry, and realizes the refined treatment and lifting of the uneven settlement disease of the ballastless track without damaging the ballastless track. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a cross-sectional view of the layout of the segmented expandable bladder of the present invention;

[0038] Figure 2 It is a side view of the segmented expandable bladder arrangement structure of the present invention;

[0039] Figure 3It is a schematic diagram of the connection structure of the segmented expandable bladder of the present invention.

[0040] Description of reference numerals:

[0041] 1-sleeper; 2-concrete ballast plate; 3-concrete base plate; 4-roadbed base; 5-segmented expandable bladder; 6-drilling hole; 7-grouting connection end; 8-screw connection end; 9-sealing end; 10-segmented grouting pipe; 11-grouting main pipe; 12-grouting equipment. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figure 1-3 As shown, the present invention provides a technical solution: a method for treating settlement damage of an existing high-speed railway ballastless track, characterized in that it comprises the following steps:

[0044] S1, determining the lifting amount of the ballastless track and the layout position of the segmented expandable bladder 5;

[0045] Use a high-precision level to detect the ballastless track, determine the lifting amount of the ballastless track according to the measurement results and actual conditions, and determine the layout position of the segmented expandable bladder 5;

[0046] In order to ensure the lifting effect and reduce the impact on the roadbed, the segmented expandable bladder 5 is arranged in the lower roadbed between the sleepers 1 on both sides.

[0047] S2, making a segmented expandable bladder 5;

[0048] The integrity and compactness of the segmented inflatable bladder 5 are manufactured and tested. The surface material of the segmented inflatable bladder 5 is made of a high-strength elastic material with an embedded tensile reinforcement mesh. The compressive strength of the segmented inflatable bladder 5 is greater than 2 MPa.

[0049] In order to improve the puncture resistance of the segmented inflatable bladder 5 , an anti-scratch felt is provided outside the segmented inflatable bladder 5 .

[0050] The two ends of the segmented expandable bladder 5 are connecting ends, and the connecting ends of the segmented expandable bladder 5 are provided with spiral connecting ends 8, and the spiral connecting ends 8 are provided with grouting holes. A segmented grouting pipe 10 is respectively installed in each segmented expandable bladder 5, which is convenient for controlling the grouting operation of each segmented expandable bladder 5.

[0051] According to the ballastless track lifting amount determined in S1, the number of capsules to be buried is determined to be 2, each consisting of 3 segmented capsules, each segment is 6m long and buried at a depth of 1.5m;

[0052] S3, drilling operation;

[0053] Curved drilling operations are performed in the roadbed starting from the side of the embankment, the drilling depth of the borehole 6 is consistent with the preset burial depth of the segmented expandable bladder 5, and the drilling direction of the borehole 6 is parallel to the direction of track travel.

[0054] S4, tying the expandable bladder;

[0055] The segmented expandable bladder 5 is bundled to the minimum diameter to ensure that the bundling material can maintain the shape of the expandable bladder before grouting and does not affect the expansion of the bladder during the grouting process; the segmented expandable bladder 5 can be bundled to a minimum diameter of 6-10cm, and the maximum diameter range of the segmented expandable bladder 5 after grouting and expansion is 20-40cm.

[0056] S5, grouting and lifting of segmented expandable bladder 5;

[0057] The segmented inflatable bladder 5 is fixed to the grouting connection end 7 and the plugging end 9 by a throat clamp, and the gap between the segmented inflatable bladder 5 and the grouting connection end 7 and the plugging end 9 is blocked and waterproofed by epoxy resin. The grouting connection end 7 and the plugging end 9 are respectively installed and connected to the segmented inflatable bladder 5 at the front end and the rear end, and then the segmented inflatable bladder 5 after the grouting connection end 7 and the plugging end 9 are placed in the Placed in the drilled hole of the roadbed, the segmented expandable bladder 5 has a segmented grouting pipe 10 built in it, and then the segmented grouting pipe 10 is connected to the grouting equipment 12 through the grouting main pipe 11, and the grouting equipment 12 is used to inject slurry into the segmented expandable bladder 5. The grouting pressure is between 0.2 and 0.4 MPa. The slurry is a slow-setting cement slurry. The lifting amount can be controlled by different injection times and different injection speeds, so as to achieve supplementary correction of uneven settlement of the ballastless track.

[0058] During the grouting process, the deformation of the concrete ballast plate 2, the concrete base plate 3 and the roadbed 4 is monitored in real time, and the grouting is stopped when the preset lifting height is reached;

[0059] S6, grouting pipe removal;

[0060] After the concrete ballast plate 2 is lifted to the preset height, the grouting pipe is removed, the grouting connection end 7 is sealed, and the deformation of the concrete ballast plate 2 is continuously monitored, and the track geometry is rechecked to complete the settlement disease control operation.

[0061] The invention has the advantages of simple construction, flexible arrangement, high lifting efficiency and low treatment cost, and avoids the pollution of surrounding soil by slurry, and realizes the refined treatment and lifting of uneven settlement disease of ballastless track without damaging the ballastless track.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for treating settlement damage of an existing high-speed railway ballastless track, characterized in that: The following steps are involved: S1, determining the lifting amount of the ballastless track and the layout position of the segmented expandable bladder (5); Using a high-precision level to detect uneven settlement of the ballastless track, determining the lifting amount of the ballastless track based on the measurement results, and determining the layout position of the segmented expandable bladder (5) to be used; S2, manufacturing a segmented expandable bladder (5); Produce and inspect the integrity and compactness of the segmented expandable bladder (5), and determine the number, length, burial position and burial depth parameters of the segmented expandable bladder (5) according to the ballastless track lifting amount determined in S1; S3, drilling operation; Starting from the side of the embankment, a curved drilling operation is performed in the roadbed subgrade, and the drilling depth of the formed borehole (6) is consistent with the preset burial depth of the segmented expandable bladder (5); S4, tying the expandable bladder; Bundling the segmented expandable bladder (5) to a minimum diameter, ensuring that the bundling material can maintain the shape of the expandable bladder before grouting and does not affect the expansion of the bladder during the grouting process; S5, grouting and lifting of the segmented expandable bladder (5); The grouting connection end (7) and the plugging end (9) are respectively installed and connected to the segmented expandable bladder (5), and then the installed segmented expandable bladder (5) is placed in the roadbed subgrade borehole (6). The segmented expandable bladder (5) is preset with a segmented grouting pipe (10), and the segmented grouting pipe (10) is connected to the grouting equipment (12) through a grouting main pipe (11). The grouting equipment (12) is used to inject slurry into the segmented expandable bladder (5); during the grouting process, the deformation of the concrete roadbed plate (2), the concrete base plate (3) and the roadbed subgrade (4) is monitored in real time, and the grouting is stopped after the concrete roadbed plate (2) reaches a preset lifting height; S6, grouting pipe removal; After the concrete ballast plate (2) is lifted to a preset height, the grouting pipe is removed, the grouting connection end (7) is sealed, and the deformation of the concrete ballast plate (2) is continuously monitored. Finally, the geometric dimensions of the track are rechecked to complete the settlement disease control operation.

2. The method for treating settlement damage of an existing high-speed railway ballastless track according to claim 1 is characterized in that: The surface material of the segmented inflatable bladder (5) is made of a high-strength elastic material with an embedded anti-tensile reinforcement mesh, and the compressive strength of the segmented inflatable bladder (5) is greater than 2 MPa.

3. The method for treating settlement damage of an existing high-speed railway ballastless track according to claim 1 is characterized in that: The segmented expandable bladder (5) is also provided with anti-scratch felt outside.

4. The method for treating settlement damage of an existing high-speed railway ballastless track according to claim 1 is characterized in that: The two ends of the segmented expandable bladder (5) are connection ends, and the connection ends of the segmented expandable bladder (5) are provided with spiral connection ends (8), and the spiral connection ends (8) are provided with grouting holes.

5. The method for treating settlement damage of existing high-speed railway ballastless track according to claim 1, characterized in that: The drilling direction of the curved drilling path (6) in S3 is parallel to the direction of track travel.

6. The method for treating settlement damage of existing high-speed railway ballastless track according to claim 1, characterized in that: The segmented expandable bladder (5) in S4 can be bundled to a minimum diameter of 6-10 cm, and the maximum diameter of the segmented expandable bladder (5) after grouting expansion is 20-40 cm.

7. The method for treating settlement damage of existing high-speed railway ballastless track according to claim 3 is characterized in that: The adjacent segmented expandable bladders (5) and the grouting connection ends (7) and the plugging ends (9) are fixed to each other by means of throat clamps, and epoxy resin is used to seal and waterproof the gaps between the segmented expandable bladders (5) and the grouting connection ends (7) and the plugging ends (9).

8. The method for treating settlement damage of existing high-speed railway ballastless track according to claim 1, characterized in that: The slurry is a slow-setting cement slurry.

9. The method for treating settlement damage of existing high-speed railway ballastless track according to claim 1, characterized in that: The grouting pressure of the grouting equipment (12) is between 0.2 and 0.4 MPa.

10. The method for treating settlement damage of existing high-speed railway ballastless track according to claim 1, characterized in that: The segmented expandable bladder (5) in S1 is arranged in the lower roadbed between the sleepers (1) on both sides.

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