A short roadbed transition section structure between highway bridges and tunnels and its construction method

Abstract

The present invention relates to the technical field of short roadbed transition section structure, and discloses a short roadbed transition section structure between a highway bridge and a tunnel, comprising a bridge casting section and a concrete platform, and also comprising a front steel platform cast and connected to the bridge casting section and a rear steel platform cast and connected to the concrete platform, a group of elastic follower components distributed in a linear array are arranged between the front steel platform and the rear steel platform, the elastic follower components include an L-shaped transition plate, a follower platform, a connecting guide groove opened in the front steel platform and a corrugated telescopic plate installed between the front steel platform and the rear steel platform, the L-shaped transition plate is fixedly connected to the corrugated telescopic plate, and a group of vertically arranged first elastic limiters are installed between the follower platform and the rear steel platform. The present invention effectively improves the structural strength of the telescopic follower structure between the front steel platform and the rear steel platform and improves the load-bearing capacity of the transition section structure by setting the ratio of the length of the L side of the top surface of the L-shaped transition plate to the width of the corrugated telescopic plate.

Description

Technical Field

[0001] The present invention relates to the technical field of short roadbed transition section structures, and more specifically, to a short roadbed transition section structure between a highway bridge and a tunnel and a construction method thereof. Background Art

[0002] In the construction of expressways, it is necessary to connect highway bridges and tunnels, but the existing connection methods and reinforcement methods are insufficient in stability and strength, and the highway bridges and tunnels are made of different materials, which are not easy to compact and have uneven settlement, resulting in vehicle jumping during later operations, affecting operational safety. In the prior art, a patent document with publication number CN114922023B discloses a short roadbed transition section structure between highway bridges and tunnels and a construction method thereof, comprising: a tunnel external connection road, one end of which is fixedly connected to a bridge connection road, a plug-in block, which is opened at one end of the tunnel external connection road, one end of which is fixedly connected to a connection groove, and the connection groove is movably plugged into the plug-in block. The above structure can improve the connection stability and stability strength between the tunnel external connection road and the bridge connection road, but the above structure has the following technical problems when used: 1. It is not easy to reduce the vehicle jumping and bumping when driving to the transition section; 2. It is not convenient to improve the structural strength of the transition section structure and the load-bearing capacity of the transition section structure on the basis of maintaining the elastic connection structure; 3. It is not convenient to realize the rapid compensation of the settlement of the transition section structure; Based on this, the present invention provides a short roadbed transition section structure between a highway bridge and a tunnel and a construction method thereof to solve the technical problems raised in the above-mentioned background technology. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a short roadbed transition section structure between a highway bridge and a tunnel and a construction method thereof. The present invention effectively improves the structural strength of the telescopic follow-up structure between the front steel platform and the rear steel platform and increases the load-bearing capacity of the transition section structure by setting the ratio of the length of the L side of the top surface of the L-shaped transition plate to the width of the corrugated telescopic plate.

[0004] To achieve the above object, the present invention provides the following technical solution: a short roadbed transition section structure between a highway bridge and a tunnel, comprising a bridge casting section and a concrete road platform, and also comprising a front steel platform cast and connected to the bridge casting section and a rear steel platform cast and connected to the concrete road platform, wherein a group of elastic follower components distributed in a linear array are arranged between the front steel platform and the rear steel platform; The elastic follower component includes an L-shaped transition plate, a follower platform, a connecting guide groove opened in the front steel platform, and a corrugated telescopic plate installed between the front steel platform and the rear steel platform. The L-shaped transition plate is fixedly connected to the corrugated telescopic plate. A group of vertically arranged first elastic limiters are installed between the follower platform and the rear steel platform. A group of horizontally arranged second elastic limiters are installed between the follower platform and the L-shaped transition plate. The L-shaped transition plate is slidably fitted with the connecting guide groove. The concrete road platform is provided with a roadbed slope, on which a base soil layer, a concrete interlayer, a grouting layer, a floating plate layer, a gravel layer and an asphalt base layer are arranged in sequence from bottom to top; It also includes an adjusting platform installed on the concrete road platform, a group of hydraulic rods are hinged between the adjusting platform and the front steel platform and the rear steel platform, two groups of distance measuring probes are installed on the adjusting platform, and the two distance measuring probes are respectively facing the front steel platform and the rear steel platform.

[0005] As a preferred technical solution of the present invention, it also includes two groups of symmetrically arranged protective parts, the protective parts include a protective tube, the tail end of the protective tube is hinged to the rear steel platform, the inner wall of the protective tube is slidably connected with an I-shaped pull rod, the I-shaped pull rod is hinged to the front steel platform, and a limit spring is sleeved on the I-shaped pull rod and at a position corresponding to the outer side of the protective tube.

[0006] As a preferred technical solution of the present invention, the first elastic limiting member includes a vertical guide rod installed on the bottom surface of the follow-up platform, the vertical guide rod is slidably connected to the rear steel platform, a vertical spring is sleeved on the vertical guide rod and corresponds to the position between the follow-up platform and the rear steel platform, and a first nut is threadedly installed on the vertical guide rod and corresponds to the position below the rear steel platform.

[0007] As a preferred technical solution of the present invention, the second elastic limit member includes a vertical slide groove opened on the front steel platform, a limit slider is slidably installed on the inner wall of the vertical slide groove, a flat guide rod is installed on the L-shaped transition plate, the flat guide rod is slidably connected to the limit slider, a flat spring is sleeved on the flat guide rod and corresponds to the positions on both sides of the limit slider, and a second nut is threadedly installed on the flat guide rod and corresponds to the outer side of the limit slider.

[0008] As a preferred technical solution of the present invention, a group of embedded steel bars are installed at the tail of the front steel platform and the rear steel platform and the bottom surface of the adjustment platform, the cross-section of the corrugated expansion plate is U-shaped, the corrugated expansion plate is made of stainless steel, and the length of the L side of the top surface of the L-shaped transition plate is 30-50 times the width of the corrugated expansion plate.

[0009] As a preferred technical solution of the present invention, each of the elastic follower components also includes a limit baffle, a limit opening opened on the front steel platform and a threaded rod fixed on the rear steel platform, and a third nut that cooperates with the limit baffle is threadedly installed on the threaded rod at a position corresponding to the outer side of the limit baffle.

[0010] As a preferred technical solution of the present invention, the angle between the roadbed slope and the horizontal plane is 45°, and the front steel platform and the rear steel platform are both made of steel.

[0011] As a preferred technical solution of the present invention, a construction method of a short roadbed transition section structure between a highway bridge and a tunnel comprises the following steps: SS01, pre-casting, before the front steel platform, the rear steel platform and the adjustment platform are cast and fixed, the roadbed template of the bridge casting section, the casting template of the concrete road platform and the casting template of the concrete road platform are pre-built. After the above multiple templates are built, the position of the front steel platform relative to the bridge casting section, the casting position of the rear steel platform relative to the concrete road platform and the position of the adjustment platform relative to the concrete road platform are positioned by external auxiliary positioning parts. After the above positions are defined, concrete is cast in the roadbed template of the bridge casting section, the casting template of the concrete road platform and the casting template of the concrete road platform. After the casting material is dried and cured, the position of the front steel platform, the rear steel platform and the adjustment platform is defined; SS02, installation: after step SS01, an elastic follower component is installed between the front steel platform and the rear steel platform. After the elastic follower component is installed, a corrugated expansion plate is installed between the front steel platform and the rear steel platform by welding; SS03, backfilling. After SS02, the base soil layer, concrete interlayer, grouting layer, floating plate layer, gravel layer and asphalt base layer are laid on the slope of the roadbed from bottom to top. After the asphalt base layer is laid, keep the asphalt base layer flush with the rear steel platform; SS04, maintenance, after step SS03, according to the settlement of the asphalt base, the grouting amount and thickness of the grouting layer are adjusted in real time, and the settlement compensation of the asphalt base is completed. According to the data feedback from the two sets of ranging probes, the extension and retraction of the two sets of hydraulic rods are adjusted respectively to keep the front steel platform and the rear steel platform flush.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, when the front steel platform and the rear steel platform undergo relative displacement or relative deformation, the corrugated telescopic plate undergoes driven telescoping, and the vehicle remains stable and is not prone to jumping or bumping when traveling between the front steel platform and the rear steel platform. By setting the first elastic limiter and the second elastic limiter, the top surface of the L-shaped transition plate is always flush with the top surface of the front steel platform, and the side surface of the L-shaped transition plate is always in contact with the front steel platform. By setting the above state, the gap between the front steel platform and the rear steel platform and the height difference between the front steel platform and the rear steel platform are effectively reduced. During actual layout, the length of the side L of the top surface of the L-shaped transition plate is times the width of the corrugated telescopic plate. By setting the ratio of the side length of the top surface L of the L-shaped transition plate to the width of the corrugated telescopic plate, the structural strength of the telescopic follow-up structure between the front steel platform and the rear steel platform is effectively improved, and the load-bearing capacity of the transition section structure is improved.

[0013] 2. When the transition section structure is actually used, it is equipped with a maintenance host. The data end of the distance measuring probe is connected to the maintenance host data. The maintenance host monitors the data feedback of the two distance measuring probes to detect the settlement of the front steel platform and the rear steel platform in real time. Through the detection of the settlement of the front steel platform and the rear steel platform, it is convenient to independently adjust the two groups of hydraulic rods and realize the settlement compensation of the front steel platform and the rear steel platform. Each group of distance measuring probes is arranged in a multi-point manner, thereby realizing multi-point monitoring of the roadbed transition section structure. Through the setting of protective parts, the maximum movable amount between the front steel platform and the rear steel platform is limited from the outside. Through the setting of limit baffles, the maximum movable amount between the front steel platform and the rear steel platform is limited from the inside, thereby effectively improving the safety of the transition section structure during operation from both inside and outside directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional structure diagram of a short roadbed transition section structure between a highway bridge and tunnel according to the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the local enlarged structure at point A in the middle; Figure 3 It is a schematic diagram of the structure of the front steel platform and the rear steel platform of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the local enlarged structure at B in the middle; Figure 5 It is a structural schematic diagram of the rear steel platform and the corrugated expansion plate of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the follower table and the rear steel table of the present invention; Figure 7 It is a schematic diagram of the structure of the corrugated expansion plate and the limit sliding block of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the front steel platform and the connecting guide groove of the present invention; Fig. 9 This is a schematic diagram of the structure of the adjustment platform.

[0015] In the figure: 1. Bridge casting section; 2. Concrete road platform; 3. Front steel platform; 4. Rear steel platform; 5. Corrugated expansion plate; 6. Follow-up platform; 7. Connecting guide groove; 8. Base soil layer; 9. Concrete interlayer; 10. Slurry layer; 11. Floating plate layer; 12. Gravel layer; 13. Asphalt base layer; 14. Adjustment platform; 15. Hydraulic rod; 16. Distance measuring probe; 17. Protective tube; 18. I-shaped pull rod; 19. Limit spring; 20. Vertical guide rod; 21. Vertical spring; 22. Vertical slide groove; 23. Limit slider; 24. Flat guide rod; 25. Flat spring; 26. Embedded steel bar; 27. Limit baffle; 28. Threaded rod; 29. ​​Limit opening; 30. L-shaped transition plate. DETAILED DESCRIPTION

[0016] 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.

[0017] like Figures 1 to 9 As shown, the present invention provides a short roadbed transition section structure between a highway bridge and a tunnel, comprising a bridge casting section 1 and a concrete road platform 2, and also comprising a front steel platform 3 cast and connected to the bridge casting section 1 and a rear steel platform 4 cast and connected to the concrete road platform 2; The front steel platform 3 and the rear steel platform 4 are both made of steel; A group of elastic follower components distributed in a linear array are arranged between the front steel platform 3 and the rear steel platform 4; The elastic follower component includes an L-shaped transition plate 30, a follower platform 6, a connecting guide groove 7 provided in the front steel platform 3, and a corrugated expansion plate 5 installed between the front steel platform 3 and the rear steel platform 4. The cross section of the corrugated expansion plate 5 is U-shaped. The L-shaped transition plate 30 is fixedly connected to the corrugated expansion plate 5, and the corrugated expansion plate 5 is made of stainless steel; When the front steel platform 3 and the rear steel platform 4 are relatively displaced or deformed, the corrugated expansion plate 5 is driven to expand and contract, so that the vehicle remains stable when traveling between the front steel platform 3 and the rear steel platform 4 without jumping or bumping. A set of vertically arranged first elastic limiting members is installed between the follower platform 6 and the rear steel platform 4; The first elastic limiter includes a vertical guide rod 20 installed on the bottom surface of the follower platform 6, the vertical guide rod 20 is slidably connected to the rear steel platform 4, a vertical spring 21 is sleeved on the vertical guide rod 20 and corresponds to the position between the follower platform 6 and the rear steel platform 4, and a first nut is threadedly installed on the vertical guide rod 20 and corresponds to the position below the rear steel platform 4; A set of horizontally arranged second elastic limiters is installed between the follower table 6 and the L-shaped transition plate 30, and the L-shaped transition plate 30 is slidably fitted with the connecting guide groove 7; The second elastic limiter comprises a vertical slide groove 22 provided on the front steel platform 3, a limit slider 23 is slidably mounted on the inner wall of the vertical slide groove 22, a flat guide rod 24 is mounted on the L-shaped transition plate 30, the flat guide rod 24 is slidably connected with the limit slider 23, a flat spring 25 is sleeved on the flat guide rod 24 and at positions corresponding to both sides of the limit slider 23, and a second nut is threadedly mounted on the flat guide rod 24 and at a position corresponding to the outer side of the limit slider 23; By setting the first elastic stopper and the second elastic stopper, the top surface of the L-shaped transition plate 30 is always flush with the top surface of the front steel platform 3, and the side surface of the L-shaped transition plate 30 is always in contact with the front steel platform 3. By setting the above state, the gap between the front steel platform 3 and the rear steel platform 4 and the height difference between the front steel platform 3 and the rear steel platform 4 are effectively reduced; In actual layout, the length of the top side L of the L-shaped transition plate 30 is 30 times the width of the corrugated expansion plate 5; By setting the ratio of the length of the top side L of the L-shaped transition plate 30 to the width of the corrugated telescopic plate 5, the structural strength of the telescopic follower structure between the front steel platform 3 and the rear steel platform 4 is effectively improved and the load-bearing capacity of the transition section structure is increased; A roadbed slope is provided on the concrete road platform 2, and the angle between the roadbed slope and the horizontal plane is 45°; The roadbed slope is provided with a base soil layer 8, a concrete interlayer 9, a grouting layer 10, a floating plate layer 11, a gravel layer 12 and an asphalt base layer 13 in order from bottom to top; By setting the concrete interlayer 9, the bottom limit of the grouting layer 10 is effectively defined. When the transition section structure is maintained, the position of the floating plate layer 11 can be adjusted by adjusting the grouting amount in the grouting layer 10. By adjusting the position of the floating plate layer 11, the settlement compensation of the asphalt base layer 13 can be achieved. It also includes an adjusting platform 14 installed on the concrete road platform 2, a group of hydraulic rods 15 are hinged between the adjusting platform 14 and the front steel platform 3 and the rear steel platform 4, and two groups of distance measuring probes 16 are installed on the adjusting platform 14, and the two distance measuring probes 16 are respectively facing the front steel platform 3 and the rear steel platform 4.

[0018] When the transition section structure is actually used, it is equipped with a maintenance host, and the data end of the distance measuring probe 16 is connected to the maintenance host data. The maintenance host monitors the data feedback of the two distance measuring probes 16 to detect the settlement of the front steel platform 3 and the rear steel platform 4 in real time. Through the detection of the settlement of the front steel platform 3 and the rear steel platform 4, it is convenient to independently adjust the two groups of hydraulic rods 15 and realize the settlement compensation of the front steel platform 3 and the rear steel platform 4. Each set of distance measuring probes 16 is arranged in a multi-point manner, thereby realizing multi-point monitoring of the roadbed transition section structure; It also includes two groups of symmetrically arranged protective parts, which include a protective tube 17. The tail end of the protective tube 17 is hinged to the rear steel platform 4. The inner wall of the protective tube 17 is slidably connected with an I-shaped pull rod 18. The I-shaped pull rod 18 is hinged to the front steel platform 3. A limit spring 19 is sleeved on the I-shaped pull rod 18 and corresponds to the position of the outer side of the protective tube 17.

[0019] By setting the protective piece, the maximum movable amount between the front steel platform 3 and the rear steel platform 4 is limited from the outside; A group of embedded steel bars 26 are installed at the tail of the front steel platform 3 and the rear steel platform 4 and the bottom surface of the adjustment platform 14 .

[0020] Each elastic follower component further includes a limit baffle 27, a limit opening 29 opened on the front steel platform 3 and a threaded rod 28 fixed on the rear steel platform 4, and a third nut matching the limit baffle 27 is threadedly installed on the threaded rod 28 at a position corresponding to the outer side of the limit baffle 27; By setting the limit baffle 27, the maximum movable amount between the front steel platform 3 and the rear steel platform 4 is limited internally.

[0021] A construction method for a short roadbed transition section structure between a highway bridge and a tunnel comprises the following steps: SS01, pre-casting, before the front steel platform 3, the rear steel platform 4 and the adjusting platform 14 are cast and fixed, the roadbed template of the bridge casting section 1, the casting template of the concrete road platform 2 and the casting template of the concrete road platform 2 are pre-constructed. After the above multiple templates are constructed, the external auxiliary positioning parts are used to locate the position of the front steel platform 3 relative to the bridge casting section 1, the casting position of the rear steel platform 4 relative to the concrete road platform 2 and the position of the adjusting platform 14 relative to the concrete road platform 2. After the above positions are defined, concrete is cast in the roadbed template of the bridge casting section 1, the casting template of the concrete road platform 2 and the casting template of the concrete road platform 2. After the casting material is dried and cured, the position definition of the front steel platform 3, the rear steel platform 4 and the adjusting platform 14 is then realized; SS02, installation, after step SS01, an elastic follower component is installed between the front steel platform 3 and the rear steel platform 4. After the elastic follower component is installed, a corrugated expansion plate 5 is installed between the front steel platform 3 and the rear steel platform 4 by welding; SS03, backfilling, after step SS02, the base soil layer 8, the concrete interlayer 9, the grouting layer 10, the floating plate layer 11, the gravel layer 12 and the asphalt base layer 13 are laid on the roadbed slope from bottom to top. After the asphalt base layer 13 is laid, the asphalt base layer 13 is kept flush with the rear steel platform 4; SS04, maintenance, after step SS03, according to the settlement of the asphalt base layer 13, the grouting amount and the thickness of the grouting layer 10 are adjusted in real time, and the settlement compensation of the asphalt base layer 13 is completed. According to the data feedback of the two sets of ranging probes 16, the extension and retraction amounts of the two sets of hydraulic rods 15 are adjusted respectively to keep the front steel platform 3 and the rear steel platform 4 flush.

[0022] The working principle and use process of the present invention: In the present invention, when the front steel platform 3 and the rear steel platform 4 are relatively displaced or deformed, the corrugated telescopic plate 5 is driven to telescope, and the vehicle remains stable and is not prone to jumping or bumping when traveling between the front steel platform 3 and the rear steel platform 4. By setting the first elastic limiter and the second elastic limiter, the top surface of the L-shaped transition plate 30 is always flush with the top surface of the front steel platform 3, and the side surface of the L-shaped transition plate 30 is always in contact with the front steel platform 3. By setting the above state, the gap between the front steel platform 3 and the rear steel platform 4 and the height difference between the front steel platform 3 and the rear steel platform 4 are effectively reduced. During actual layout, the length of the side L of the top surface of the L-shaped transition plate 30 is 30 times the width of the corrugated telescopic plate 5. By setting the ratio of the side length L of the top surface of the L-shaped transition plate 30 to the width of the corrugated telescopic plate 5, the structural strength of the telescopic follow-up structure between the front steel platform 3 and the rear steel platform 4 is effectively improved and In order to improve the load-bearing capacity of the transition section structure, when the transition section structure is actually used, it is equipped with a maintenance host, and the data end of the distance measuring probe 16 is connected to the data of the maintenance host. The maintenance host monitors the data feedback of the two distance measuring probes 16 to detect the settlement of the front steel platform 3 and the rear steel platform 4 in real time. Through the detection of the settlement of the front steel platform 3 and the rear steel platform 4, it is convenient to independently adjust the two groups of hydraulic rods 15 and realize the settlement compensation of the front steel platform 3 and the rear steel platform 4. When each group of distance measuring probes 16 is arranged, it is arranged in a multi-point shape, thereby realizing multi-point monitoring of the roadbed transition section structure. Through the setting of the protective part, the maximum movable amount between the front steel platform 3 and the rear steel platform 4 is limited from the outside. Through the setting of the limit baffle 27, the maximum movable amount between the front steel platform 3 and the rear steel platform 4 is limited from the inside, thereby effectively improving the safety of the transition section structure during operation from both inside and outside directions.

[0023] 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.

[0024] 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 short roadbed transition section structure between a highway bridge and a tunnel, comprising a bridge casting section (1) and a concrete road platform (2), characterized in that: It also includes a front steel platform (3) connected to the bridge casting section (1) by casting, and a rear steel platform (4) connected to the concrete road platform (2) by casting, wherein a group of elastic follower components distributed in a linear array are arranged between the front steel platform (3) and the rear steel platform (4); The elastic follower component comprises an L-shaped transition plate (30), a follower platform (6), a connecting guide groove (7) provided in the front steel platform (3), and a corrugated telescopic plate (5) installed between the front steel platform (3) and the rear steel platform (4); the L-shaped transition plate (30) is fixedly connected to the corrugated telescopic plate (5); a group of vertically arranged first elastic stoppers are installed between the follower platform (6) and the rear steel platform (4); a group of horizontally arranged second elastic stoppers are installed between the follower platform (6) and the L-shaped transition plate (30); and the L-shaped transition plate (30) is slidably fitted with the connecting guide groove (7); The concrete road platform (2) is provided with a roadbed slope, and the roadbed slope is provided with a base soil layer (8), a concrete interlayer (9), a grouting layer (10), a floating plate layer (11), a gravel layer (12) and an asphalt base layer (13) in sequence from bottom to top; It also includes an adjustment platform (14) installed on the concrete road platform (2), a group of hydraulic rods (15) are hinged between the adjustment platform (14) and the front steel platform (3) and the rear steel platform (4), and two groups of distance measuring probes (16) are installed on the adjustment platform (14), and the two distance measuring probes (16) are respectively facing the front steel platform (3) and the rear steel platform (4).

2. A short roadbed transition section structure between a highway bridge and a tunnel according to claim 1, characterized in that: It also includes two groups of symmetrically arranged protective parts, the protective parts including a protective tube (17), the rear end of the protective tube (17) is hinged to the rear steel platform (4), the inner wall of the protective tube (17) is slidably connected with an I-shaped pull rod (18), the I-shaped pull rod (18) is hinged to the front steel platform (3), and a limit spring (19) is sleeved on the I-shaped pull rod (18) and at a position corresponding to the outer side of the protective tube (17).

3. The short roadbed transition section structure between a highway bridge and a highway tunnel according to claim 1 is characterized by: The first elastic limiting member comprises a vertical guide rod (20) mounted on the bottom surface of the follower platform (6), the vertical guide rod (20) being slidably connected to the rear steel platform (4), a vertical spring (21) being sleeved on the vertical guide rod (20) and corresponding to a position between the follower platform (6) and the rear steel platform (4), and a first nut being threadedly mounted on the vertical guide rod (20) and corresponding to a position below the rear steel platform (4).

4. The short roadbed transition section structure between a highway bridge and a highway tunnel according to claim 1, characterized in that: The second elastic limiting member comprises a vertical slide groove (22) provided on the front steel platform (3); a limiting slider (23) is slidably mounted on the inner wall of the vertical slide groove (22); a flat guide rod (24) is mounted on the L-shaped transition plate (30); the flat guide rod (24) is slidably connected to the limiting slider (23); a flat spring (25) is sleeved on the flat guide rod (24) at positions corresponding to both sides of the limiting slider (23); and a second nut is threadedly mounted on the flat guide rod (24) at a position corresponding to the outer side of the limiting slider (23).

5. The short roadbed transition section structure between a highway bridge and a highway tunnel according to claim 1, characterized in that: A group of embedded steel bars (26) are installed at the tails of the front steel platform (3) and the rear steel platform (4) and the bottom surface of the adjustment platform (14); the cross section of the corrugated expansion plate (5) is U-shaped; the corrugated expansion plate (5) is made of stainless steel.

6. The short roadbed transition section structure between a highway bridge and a highway tunnel according to claim 1, characterized in that: Each of the elastic follower components further comprises a limit baffle (27), a limit opening (29) formed on the front steel platform (3), and a threaded rod (28) fixed on the rear steel platform (4); a third nut cooperating with the limit baffle (27) is threadedly mounted on the threaded rod (28) at a position corresponding to the outer side of the limit baffle (27).

7. The short roadbed transition section structure between a highway bridge and a highway tunnel according to claim 1 is characterized by: The angle between the roadbed slope and the horizontal plane is 45°, and the front steel platform (3) and the rear steel platform (4) are both made of steel material.

8. A construction method for a short roadbed transition section structure between a highway bridge and a tunnel according to any one of claims 1 to 7, characterized in that: The following steps are involved: SS01, pre-casting, before the front steel platform (3), the rear steel platform (4) and the adjustment platform (14) are cast and fixed, the roadbed template of the bridge casting section (1), the casting template of the concrete road platform (2) and the casting template of the concrete road platform (2) are pre-constructed. After the above-mentioned multiple templates are constructed, the position of the front steel platform (3) relative to the bridge casting section (1), the casting position of the rear steel platform (4) relative to the concrete road platform (2) and the position of the adjustment platform (14) relative to the concrete road platform (2) are positioned by using external auxiliary positioning parts. After the above-mentioned positions are defined, concrete is cast in the roadbed template of the bridge casting section (1), the casting template of the concrete road platform (2) and the casting template of the concrete road platform (2). After the casting material is dried and cured, the position of the front steel platform (3), the rear steel platform (4) and the adjustment platform (14) is defined; SS02, installation: after step SS01, an elastic follower component is installed between the front steel platform (3) and the rear steel platform (4). After the elastic follower component is installed, a corrugated expansion plate (5) is installed between the front steel platform (3) and the rear steel platform (4) by welding. SS03, backfilling, after step SS02, laying the base soil layer (8), concrete interlayer (9), grouting layer (10), floating plate layer (11), gravel layer (12) and asphalt base layer (13) on the roadbed slope from bottom to top. After the asphalt base layer (13) is laid, the asphalt base layer (13) is kept flush with the rear steel platform (4); SS04, maintenance, after step SS03, the grouting amount and thickness of the grouting layer (10) are adjusted in real time according to the settlement amount of the asphalt base layer (13), and the settlement compensation of the asphalt base layer (13) is completed. According to the data feedback of the two sets of distance measuring probes (16), the extension and retraction amounts of the two sets of hydraulic rods (15) are adjusted respectively, so that the front steel platform (3) and the rear steel platform (4) are kept flush.

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