Smooth control and repair method for transition section of high-speed railway roadbed bridge

Abstract

A high-speed railway roadbed bridge transition section smoothness control and repair method is characterized in that a supporting body is arranged on the back of a bridge bearing platform to provide a supporting foundation for a smoothness adjusting plate, the arrangement of the smoothness adjusting plate solves the problem that the most unfavorable slab staggering deformation is formed between a bridge and a roadbed, and the smoothness adjusting plate is arranged about 1 m below the surface of the roadbed. The unfavorable deformation is obviously weakened or is not influenced when being reflected to the subgrade surface, the flexible filling body is arranged to prevent the subgrade structure at the upper part of the smooth adjusting plate from being cracked, damaged and arched upwards when the smooth adjusting plate is warped and deformed, and the soil pressure box and the grouting pipe are fixedly connected to the bottom of the smooth adjusting plate; the supporting range of the smooth adjusting plate can be judged, grouting filling reinforcement conditions are provided for multiple times of supporting, and the supporting beams provide lifting conditions for settlement deformation of a roadbed surface; the roadbed bridge transition section smoothness control and repair method has the advantages of being simple in construction, free of bridge and road deformation and slab staggering, easy in deformation overrun repair, economical, environmentally friendly, good in railway smoothness maintaining effect, beneficial to application and popularization and the like.

Description

Technical Field

[0001] The invention relates to geotechnical engineering, and in particular to a method and a device for controlling and repairing the smoothness of a transition section of a high-speed railway subgrade bridge. Background Art

[0002] High-speed railways are required to have high levels of safety, smoothness and comfort. The existing "High-speed Railway Design Specifications" require that the differential settlement of the ballastless track high-speed railway subgrade and the bridge transition section be less than 5 mm and the inflection angle be less than 1‰. Years of high-speed railway operations have shown that due to the large difference in the reinforcement depth of the bridge and subgrade foundation, the deformation requirements of the transition section between the subgrade and the bridge are difficult to meet, especially at the joints of the bridge and the subgrade, where deformation misalignment usually occurs. This is extremely unfavorable to the stress on the track structure, and the deeper the foundation soil layer, the more obvious it is. At present, when the deformation exceeds the limit, track pads are usually set to adjust the smoothness of the track structure. As more and more problems arise, the hidden dangers of setting up pads increase and the reliability decreases, especially with the continuous advancement and development of high-speed railways with a speed of 400 kilometers per hour and above, the requirements for deformation are stricter and the sensitivity to deformation is stronger, requiring higher reliability transition section smoothness control methods and technologies. Therefore, it is of great significance to propose a high-speed railway roadbed bridge transition section smoothness control and repair method, which has the characteristics of no deformation and dislocation of the bridge, good adaptability to local uneven deformation, easy repair of excessive deformation, simple construction and repair, economy and environmental protection, and conducive to promotion and application. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The technical problem to be solved by the present invention is to provide a method for controlling and repairing the smoothness of the transition section of a high-speed railway subgrade bridge, so as to solve the technical problems of repairing deformation, dislocation and excessive deformation of the transition section of the bridge subgrade, thereby ensuring that the transition section has good long-term smoothness.

[0005] (II) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for controlling and repairing the smoothness of a transition section of a high-speed railway roadbed bridge, wherein the smoothness control structure comprises a support body (3), a support beam (4), a smoothness adjustment plate (5), a transition section filling body (6), a flexible filling body (7), a grouting pipe (8), and an earth pressure box (9);

[0008] The specific construction steps are as follows:

[0009] Step A: Construct the bridge cap (2). A bridge beam body (1) is set above the bridge cap (2). A support body (3) is set at the upper middle part of the back of the bridge cap (2). The support body (3) is integrally connected with the bridge cap (2). The outer side of the top of the support body (3) is set as an arc chamfer.

[0010] Step B: Construct the transition section subgrade filling body in layers until the elevation of the top of the support body (3) set at the upper middle part of the back of the bridge cap (2) is reached.

[0011] Step C: Excavate a foundation pit groove along the cross-section direction of the subgrade on the subgrade filling body at the end of the transition section. Pour a reinforced concrete support beam in the foundation pit groove. The elevation of the support beam (4) is the same as that of the top of the support body (3), and both ends protrude outside the subgrade slope. The support beam (4) serves as the force-bearing support structure at the other end of the smooth adjustment plate (5). When the subgrade deforms too much, the smooth adjustment plate (5) can be lifted by the support beam (4) protruding outside the subgrade slope, providing conditions for grouting and filling at the bottom of the smooth adjustment plate (5).

[0012] Step D: Place grouting pipes (8) at intervals on the top of the layered transition section subgrade filling body. Both ends of the grouting pipes (8) protrude outside the subgrade slope. Earth pressure cells (9) are arranged at intervals along the longitudinal direction of the smooth adjustment plate between the grouting pipes (8), one every 0.5 m.

[0013] Step E: Construct the smooth adjustment plate (5) on the tops of the support body (3), the support beam (4), the grouting pipes (8), and the earth pressure cells (9). The width of the smooth adjustment plate (5) is the same as the widths of the bridge cap (2) and the support body (3). The grouting pipes (8) are fixed to the bottom of the smooth adjustment plate (5) through wire loops at intervals in the cross-section direction, and the earth pressure cells (9) are fixed to the bottom of the smooth adjustment plate (5) through wire mesh pockets.

[0014] Step F: Construct a flexible filling body (7) behind the bridge cap (2) on the top of the smooth adjustment plate. The height of the flexible filling body (7) is not less than 1.0 m and the width is not less than 0.5 m.

[0015] Step G: Construct the transition section filling body (6) on the top and both sides of the smooth adjustment plate.

[0016] Step H: When the number of earth pressure cells (9) with a pressure value of 0 in the direction from the bridge cap (2) to the support beam (4) is more than 3, start a certain grouting pipe (8) in the jacking area and grout and reinforce the jacking range. After grouting, clean the grouting pipe (8) and remove the cement slurry in the pipe.

[0017] Step I: Repeat Step H to continuously and dynamically fill and reinforce the newly formed jacking area; the grouting pipes (8) can be used multiple times.

[0018] Step J: When the settlement deformation of the subgrade surface at the top of the support beam (4) is detected to exceed the limit, the support beam (4) can be lifted on both sides of the subgrade, and then the void area formed by the lifting is grouted and reinforced through the grouting pipe (8). After the solidified body reaches the design strength, the lifting device is removed.

[0019] Preferably, the support body (3) described in Step A is fixedly connected to the bridge cap (2), which can provide a large support force for the smooth adjustment plate. The vertical deformation of the support body (3) is consistent with that of the bridge cap (2). After the smooth adjustment plate is arranged on the support body (3), when differential deformation occurs between the subgrade and the bridge, it is ensured that there will be no step. The outer side of the top of the support body (3) is set as an arc chamfer so that no stress concentration will be formed between the two structures when the smooth adjustment plate deforms;

[0020] Preferably, the grouting pipe (8) described in Step D provides conditions for subsequent void grouting. The two ends protruding outside the subgrade slope are convenient for cleaning the grouting pipe after grouting, so that multiple grouting constructions can be carried out; the setting of the earth pressure cell (9) can judge the void range at the bottom of the smooth adjustment plate.

[0021] Preferably, the smooth adjustment plate (5) described in Step E can adjust the uneven settlement of the filled subgrade, avoid the formation of a step between the filled subgrade and the bridge cap (2), and its width being the same as the widths of the bridge cap (2) and the support body (3) can save project investment; using a steel wire ring to fix the grouting pipe (8) to the bottom of the smooth adjustment plate can keep the grouting pipe (8) always connected to the smooth adjustment plate and always located above the void area, facilitating multiple grouting constructions without being blocked; using a steel wire mesh bag to fix the earth pressure cell (9) to the bottom of the smooth adjustment plate (5) can effectively judge whether the bottom of the smooth adjustment plate (5) is void and the void length; the grouting pipe (8) and the earth pressure cell (9) will not sink with the settlement of the subgrade filling body and the subsequent grouting body.

[0022] Preferably, the flexible filling body (7) described in Step F can be made of graded crushed stone mixed with water conservancy waterproof glue. The setting of the flexible filling body (7) can prevent the smooth adjustment plate from directly forming structural cracking, arching when warping deformation occurs, and will not be transmitted to the subgrade surface. Traditional graded crushed stone mixed with cement is prone to form cracking phenomena. When the height of the flexible filling body (7) is too small, the warping deformation of the smooth adjustment plate will directly affect the track structure on the subgrade surface, which is not conducive to track smoothness.

[0023] Preferably, the number of earth pressure cells (9) with a pressure value of 0 described in step H is greater than 3, indicating that the length of the void is greater than 1.5 m. The smooth adjustment plate forms a large suspended force, and the long-term stability of the smooth adjustment plate structure is affected. Therefore, it is necessary to grout and reinforce its bottom in time to form a new support (3). Before grouting, one end of the grouting pipe (8) is sealed, and the other end is grouted. After grouting, the grouting pipe (8) is cleaned to remove the cement slurry inside the pipe. The grouting pipe (8) can also be used for grouting construction later.

[0024] Preferably, when the settlement deformation of the roadbed surface at the top of the support beam (4) described in step J exceeds the limit, the earth pressure of the adjacent earth pressure cells is not 0, but the roadbed-bridge fold angle formed exceeds the limit. Only by lifting the support beam (4) and then grouting and reinforcing the lifted void at the bottom of the smooth adjustment plate can the structure have a larger application range.

[0025] Preferably, the embedded grouting pipe (8) is opened at the bottom of the smooth adjustment plate, and is not opened outside the two sides of the smooth adjustment plate. A closing valve is provided outside the pipe at the opening position of the grouting pipe (8). The hole is opened when there is pressure in the pipe during grouting, and the hole is closed when there is no pressure in the pipe and there is pressure outside the pipe.

[0026] (III) Beneficial effects

[0027] The beneficial effects of the present invention are as follows: setting a support at the back of the bridge abutment can provide a support foundation for the smooth adjustment plate. The setting of the smooth adjustment plate solves the most unfavorable step deformation formed between the bridge and the roadbed. The smooth adjustment plate is set about 1 m below the roadbed surface, and its unfavorable deformation is significantly weakened or has no effect when reflected to the roadbed surface. Setting a flexible filling body avoids the cracking and arching of the roadbed structure above the smooth adjustment plate when the smooth adjustment plate warps. Setting a fixed connection between the earth pressure cell and the grouting pipe at the bottom of the smooth adjustment plate can judge the void range of the smooth adjustment plate and provide the condition for grouting filling and reinforcement for multiple voids. The setting of the support beam can provide the condition for lifting when the settlement deformation of the roadbed surface exceeds the limit too much. The proposed method for controlling and repairing the smoothness of the roadbed-bridge transition section has the characteristics of simple construction, no deformation and step between the bridge and the road, easy repair of deformation exceeding the limit, economic and environmental protection, good effect of maintaining the smoothness of the railway, and being conducive to popularization and application. Description of the drawings

[0028] Figure 1 is a schematic cross-sectional view of a method and device for controlling and repairing the smoothness of a high-speed railway roadbed-bridge transition section of the present invention.

[0029] The figure shows the names of the components and their corresponding marks: bridge beam body 1, bridge abutment 2, support 3, support beam 4, smooth adjustment plate 5, transition section filling body 6, flexible filling body 7, grouting pipe 8, earth pressure cell 9. Specific embodiments

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figure 1 , a smoothness control and repair method for the transition section between a high-speed railway subgrade and a bridge, wherein the smoothness control structure includes a support body 3, a support beam 4, a smoothness adjustment plate 5, a transition section filling body 6, a flexible filling body 7, a grouting pipe 8, and an earth pressure cell 9;

[0032] The specific construction steps are as follows:

[0033] Step A: Construct the bridge abutment 2. A bridge beam body 1 is arranged above the bridge abutment 2. A support body 3 is arranged at the upper middle part of the back of the bridge abutment 2. The support body 3 is integrally connected with the bridge abutment 2. The outer side of the top of the support body 3 is set as an arc chamfer.

[0034] Step B: Construct the transition section subgrade filling body in layers until the elevation of the top of the bridge abutment 2 is reached.

[0035] Step C: Excavate a foundation pit groove in the subgrade filling body at the end of the transition section along the cross-section direction of the subgrade. Pour a reinforced concrete support beam in the foundation pit groove. The elevation of the support beam 4 is the same as that of the top of the support body 3, and both ends protrude outside the subgrade slope; the support beam 4 serves as the other end force-bearing support structure for the smoothness adjustment plate 5. When the subgrade deforms too much, the smoothness adjustment plate 5 can be lifted by the support beam 4, providing conditions for grouting and filling at the bottom of the smoothness adjustment plate 5.

[0036] Step D: Place grouting pipes 8 at intervals on the top of the layered transition section subgrade filling body. Both ends of the grouting pipes 8 protrude outside the subgrade slope. Earth pressure cells 9 are arranged at intervals along the longitudinal direction of the smoothness adjustment plate between the grouting pipes 8, with a spacing of 0.5 m for each.

[0037] Step E: Construct a smoothness adjustment plate 5 on the top of the support body 3, the support beam 4, the grouting pipes 8, and the earth pressure cells 9. The width of the smoothness adjustment plate 5 is the same as the widths of the bridge abutment 2 and the support body 3. Fix the grouting pipes 8 to the bottom of the smoothness adjustment plate 5 through spaced wire rings in the cross-section direction, and fix the earth pressure cells 9 to the bottom of the smoothness adjustment plate 5 through wire mesh bags.

[0038] Step F: Construct a flexible filling body 7 behind the bridge abutment 2 on the top of the smoothness adjustment plate. The height of the flexible filling body 7 is not less than 1.0 m and the width is not less than 0.5 m.

[0039] Step G: Fill the transition section embankment 6 at the top and both sides of the smooth adjustment plate;

[0040] Step H: When the number of earth pressure cells 9 with a pressure value of 0 from the bridge cap 2 towards the support beam 4 is more than 3, start one of the grouting pipes 8 in the void area to grout and reinforce the void range. After grouting, clean the grouting pipe 8 to remove the cement slurry inside the pipe;

[0041] Step I: Repeat Step H to continuously and dynamically fill and reinforce the newly formed void area; the grouting pipe 8 can be reused multiple times;

[0042] Step J: When the settlement deformation of the roadbed surface at the top of the support beam 4 is monitored to exceed the limit, the support beam 4 can be lifted on both sides of the roadbed, and then the void area formed by the lifting is grouted and reinforced through the grouting pipe 8. After the solidified body reaches the design strength, remove the lifting device.

[0043] In the specific implementation process, the support body 3 described in Step A is fixedly connected to the bridge cap 2, which can provide a large support force for the smooth adjustment plate. The vertical deformation of the support body 3 is consistent with that of the bridge cap 2. After setting the smooth adjustment plate on the support body 3, when differential deformation occurs between the roadbed and the bridge, it is ensured that there will be no step. The outer side of the top of the support body 3 is set as an arc chamfer so that no stress concentration will be formed between the two structures when the smooth adjustment plate deforms;

[0044] In the specific implementation process, the grouting pipe 8 described in Step D provides conditions for subsequent void grouting. The two ends protruding outside the roadbed slope are convenient for cleaning the grouting pipe after grouting, so that multiple grouting constructions can be carried out; the setting of the earth pressure cell 9 can judge the void range at the bottom of the smooth adjustment plate.

[0045] In the specific implementation process, the smooth adjustment plate 5 described in Step E can adjust the uneven settlement of the filled roadbed, avoid the formation of a step between the filled roadbed and the bridge cap 2, and its width being the same as the widths of the bridge cap 2 and the support body 3 can save project investment; using a steel wire ring to fix the grouting pipe 8 to the bottom of the smooth adjustment plate can keep the grouting pipe 8 always connected to the smooth adjustment plate and always located above the void area, facilitating multiple grouting constructions without being blocked; using a steel wire mesh bag to fix the earth pressure cell 9 to the bottom of the smooth adjustment plate 5 can effectively judge whether the bottom of the smooth adjustment plate 5 is void and the void length; the grouting pipe 8 and the earth pressure cell 9 will not sink with the settlement of the roadbed filling body and the subsequent grouting body.

[0046] During the specific implementation process, the flexible filling body 7 described in step F can be made of graded crushed stone mixed with water-proof glue. The setting of the flexible filling body 7 can prevent the smooth adjustment plate from directly causing structural cracking, arching when warping and deforming, and will not be transmitted to the roadbed top surface. Traditional graded crushed stone mixed with cement is prone to cracking. When the height of the flexible filling body 7 is too small, the warping and deformation of the smooth adjustment plate will directly affect the track structure on the roadbed surface, which is not conducive to track smoothness.

[0047] During the specific implementation process, the number of earth pressure cells 9 described in step H with a pressure value of 0 is greater than 3, indicating that the length of the void is greater than 1.5 m, and the smooth adjustment plate forms a large suspended force. The long-term stability of the smooth adjustment plate structure is affected. Therefore, it is necessary to grout and reinforce its bottom in time to form a new support body 3; before grouting, one end of the grouting pipe 8 is closed and the other end is grouted; after grouting, the grouting pipe 8 is cleaned to remove the cement slurry in the pipe. The grouting pipe 8 can also be used for grouting construction later.

[0048] During the specific implementation process, when the settlement deformation of the roadbed surface at the top of the support beam 4 described in step J exceeds the limit, the pressure of the adjacent earth pressure cells is not 0, but the formed roadbed-bridge fold angle exceeds the limit. Only by lifting the support beam 4 and then grouting and reinforcing the lifted void at the bottom of the smooth adjustment plate, the structure has a greater scope of application.

[0049] During the specific implementation process, the embedded grouting pipe 8 is opened at the bottom of the smooth adjustment plate, and is not opened outside the two sides of the smooth adjustment plate. A closing valve is provided outside the pipe at the opening position of the grouting pipe 8. The hole is opened when there is pressure in the pipe and closed when there is no pressure in the pipe and pressure outside the pipe.

[0050] To illustrate in detail the possible application scenarios, technical principles, specific implementable solutions, achievable objectives and effects of this application, etc., the following will be described in detail with reference to the specific examples listed and in conjunction with the drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application, so they are only examples and cannot be used to limit the protection scope of this application.

[0051] In this article, referring to "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of this application. The term "embodiment" appearing in various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0052] Unless otherwise defined, the meanings of technical terms used herein are the same as those commonly understood by those skilled in the technical field to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling and repairing the smoothness of a high-speed railway embankment bridge transition section, characterized in that: The smoothness control structure comprises a support body (3), a support beam (4), a smoothness adjustment plate (5), a transition section filling body (6), a flexible filling body (7), a grouting pipe (8), and an earth pressure box (9); The construction steps are as follows: Step A, constructing a bridge cap (2), arranging a bridge beam (1) on the bridge cap (2), arranging a support body (3) on the upper middle part of the back of the bridge cap (2), the support body (3) being integrally connected to the bridge cap (2), and the outer side of the top of the support body (3) being arranged to be an arc chamfer; Step B, constructing the transition section roadbed filling body in layers, and setting the top elevation of the support body (3) at the middle and upper part of the back of the bridge cap (2); Step C, excavating a foundation pit trench on the roadbed filling body at the end of the transition section along the cross-sectional direction of the roadbed, and pouring a reinforced concrete support beam in the foundation pit trench, wherein the top elevations of the support beam (4) and the support body (3) are consistent, and both ends are exposed outside the roadbed slope; the support beam (4) serves as the other end force-bearing support structure of the smoothing adjustment plate (5), and both ends of the support beam (4) are exposed outside the roadbed slope. When the roadbed is deformed too much, the smoothing adjustment plate (5) can be lifted by the support beam (4), thereby providing conditions for grouting filling at the bottom of the smoothing adjustment plate (5); Step D: grouting pipes (8) are placed at intervals on the top of the layered transition section roadbed fill body, with both ends of the grouting pipes (8) exposed outside the roadbed slope, and earth pressure boxes (9) are arranged at intervals of 0.5 m between the grouting pipes (8) along the longitudinal direction of the smooth adjustment plate; Step E, constructing a smooth adjustment plate (5) on the top of the support body (3), the support beam (4), the grouting pipe (8), and the earth pressure box (9), wherein the width of the smooth adjustment plate (5) is consistent with the width of the bridge abutment (2) and the support body (3), the grouting pipe (8) and the bottom of the smooth adjustment plate (5) are fixed together by steel wire rings spaced apart in the cross section, and the earth pressure box (9) and the bottom of the smooth adjustment plate (5) are fixed together by a steel wire mesh bag; Step F, constructing a flexible filling body (7) behind the bridge cap (2) at the top of the smooth adjustment plate, wherein the height of the flexible filling body (7) is not less than 1.0 m and the width is not less than 0.5 m; Step G, constructing the transition section filling body (6) on the top and both sides of the smooth adjustment plate; Step H, when the number of pressure values ​​of the earth pressure boxes (9) in the direction from the bridge pedestal (2) to the support beam (4) that are 0 is greater than 3, a grouting pipe (8) in the empty area is started to perform grouting reinforcement on the empty area, and after grouting, the grouting pipe (8) is cleaned to remove the cement slurry in the pipe; Step I and step H are repeated to continuously and dynamically fill and reinforce the re-formed hollow area; the grouting pipe (8) can be used multiple times; Step J: When it is detected that the settlement deformation of the roadbed surface at the top of the support beam (4) exceeds the limit, the support beam (4) can be lifted on both sides of the roadbed, and then the hollow area formed by the lifting is reinforced by grouting through the grouting pipe (8). After the reinforced body reaches the designed strength, the lifting device is removed.

2. A method for controlling and repairing the smoothness of a high-speed railway embankment bridge transition section according to claim 1, characterized in that: The support body (3) described in step A is fixedly connected to the bridge pedestal (2), which can provide a large supporting force for the smooth adjustment plate. The vertical deformation of the support body (3) and the bridge pedestal (2) is consistent. After the smooth adjustment plate is arranged on the support body (3), when the roadbed and the bridge produce differential deformation, it is ensured that there will be no misalignment. The outer side of the top of the support body (3) is arranged to be an arc chamfer so that when the smooth adjustment plate is deformed, no stress concentration will be formed between the two structures.

3. The method for controlling and repairing the smoothness of the transition section of a high-speed railway subgrade bridge according to claim 1 is characterized in that: The grouting pipe (8) described in step D provides conditions for the later hollow grouting. The two ends are exposed outside the roadbed slope, which makes it easy to clean the grouting pipe after grouting, so that multiple grouting constructions can be carried out; the setting of the earth pressure box (9) can determine the hollow range of the smooth adjustment of the slab bottom.

4. A method for controlling and repairing the smoothness of a high-speed railway subgrade bridge transition section according to claim 1, characterized in that: The smooth adjustment plate (5) described in step E can adjust the uneven settlement of the filled roadbed, avoid the formation of misalignment between the filled roadbed and the bridge pedestal (2), and its width is consistent with the width of the bridge pedestal (2) and the support body (3), which can save engineering investment; the use of a wire ring to fix the grouting pipe (8) and the bottom of the smooth adjustment plate together can make the grouting pipe (8) always connected to the smooth adjustment plate and always located at the upper part of the empty area, which is convenient for multiple grouting construction without being blocked; the wire mesh bag fixes the earth pressure box (9) and the bottom of the smooth adjustment plate (5) together, which can effectively determine whether the bottom of the smooth adjustment plate (5) is empty and the empty length; the grouting pipe (8) and the earth pressure box (9) will not sink with the sinking of the roadbed filled body and the later grouting body.

5. The method for controlling and repairing the smoothness of the transition section of a high-speed railway subgrade bridge according to claim 1 is characterized in that: The flexible filling body (7) described in step F can be made of graded crushed stone mixed with water-conservancy waterproof glue. The setting of the flexible filling body (7) can prevent the smooth adjustment plate from warping and deformation, and will not directly cause structural cracking and damage, arching, and will not be transmitted to the top surface of the roadbed. Traditional graded crushed stone mixed with cement will easily cause cracking. When the height of the flexible filling body (7) is too small, the warping and deformation of the smooth adjustment plate will directly react on the track structure of the roadbed surface, which is not conducive to the smoothness of the track.

6. The method for controlling and repairing the smoothness of the transition section of a high-speed railway subgrade bridge according to claim 1 is characterized in that: In step H, the number of pressure values ​​of the earth pressure box (9) being 0 is greater than 3, indicating that the length of the support is greater than 1.5 m, and the smooth adjustment plate forms a large suspended force. The long-term stability of the smooth adjustment plate structure is affected by long-term action, so it is necessary to promptly perform grouting reinforcement on the bottom to form a new support body (3); before grouting, one end of the grouting pipe (8) is closed, and grouting is performed on the other end; after grouting, the grouting pipe (8) is cleaned to remove the cement slurry in the pipe, and the grouting pipe (8) can also be used for grouting construction at a later stage.

7. The method for controlling and repairing the smoothness of the transition section of a high-speed railway subgrade bridge according to claim 1 is characterized in that: When the settlement deformation of the roadbed surface at the top of the support beam (4) in step J exceeds the limit, the pressure of the adjacent earth pressure box is not 0, but the formed roadbed bridge angle exceeds the limit. The only way is to lift the support beam (4) and then perform grouting reinforcement on the lifted support at the bottom of the smooth adjustment plate, so that the structure has a wider range of application.

8. The method for controlling and repairing the smoothness of a high-speed railway subgrade bridge transition section according to claim 1 is characterized in that: The pre-buried grouting pipe (8) is opened at the bottom of the smooth adjustment plate, and no holes are opened outside the two sides of the smooth adjustment plate. A closing valve is provided outside the grouting pipe (8) at the opening position of the grouting pipe, and the hole is opened when there is pressure in the grouting pipe, and the hole is closed when there is no pressure in the pipe and there is pressure outside the pipe.

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