New and old roadbed transition buffer structure

Abstract

The invention relates to the technical field of roadbed transition, and discloses a new and old roadbed transition buffer structure which comprises an old road and a geogrid arranged below the old road, and further comprises two connecting parts which are both mounted on the old road; the number of the fixing parts is two, and the two fixing parts are both arranged on the old road; the number of the blocking parts is two, and the two blocking parts are both installed on the old road; the connecting part comprises a movable assembly, and the movable assembly is installed on an old road. By arranging the connecting part, the problems that in the using process of an existing buffer structure, stable and reliable connection between the geogrid and an old roadbed is difficult to form, and when a new roadbed settles and generates traction stress, an inserting rod is prone to loosening and disengaging or lateral deviation, and consequently the geogrid loses a stress fulcrum, displaces, loosens and even locally wrinkles are solved.

Description

Technical Field

[0001] This invention relates to the field of roadbed transition technology, specifically to a buffer structure for the transition between old and new roadbeds. Background Technology

[0002] With the increase in traffic flow and the upgrading of road networks, a large number of existing roads need to be widened, resurfaced, or renovated to improve their functionality. This creates a core engineering scenario of connecting old and new roadbeds. Old roadbeds have typically been in operation for more than 5 years and have completed primary consolidation settlement under vehicle loads and natural settlement. The fill material has high compaction and stable structural stiffness. On the other hand, new roadbeds are made of fresh fill material and need to undergo instantaneous settlement, primary consolidation settlement, and secondary consolidation settlement processes. Moreover, their initial compaction and stiffness are lower than those of the old roadbeds. The "settlement difference" and "stiffness difference" between the two have become engineering pain points. If they are directly connected, the settlement of the new roadbed in the later stage will be much greater than that of the old roadbed, which can easily lead to longitudinal cracks, misalignment, and other defects in the pavement. In severe cases, it can cause roadbed slippage, affecting driving safety and the service life of the road. According to highway maintenance data, in widened road sections without effective transition structures, the pavement cracking rate is as high as 60% or more within 1-2 years of opening to traffic, and maintenance costs increase by 30%-50%.

[0003] However, existing buffer structures make it difficult for geogrids to form a stable and reliable connection with the old subgrade during use. When the new subgrade settles and generates tensile stress, the insert rods are prone to loosening and falling out or shifting laterally, causing the geogrid to lose its load-bearing support, resulting in displacement, loosening, or even local wrinkling. Summary of the Invention

[0004] The purpose of this invention is to provide a transition buffer structure between old and new roadbeds. By setting up a connecting part, it solves the problem that existing buffer structures are difficult to form a stable and reliable connection between the geogrid and the old roadbed during use. When the new roadbed settles and generates tensile stress, the insert rod is easy to loosen and fall out or undergo lateral displacement, causing the geogrid to lose its stress support point and resulting in displacement, loosening or even local wrinkling.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a transition buffer structure for old and new roadbeds, comprising an old road and a geogrid installed beneath the old road, and further comprising: two connecting parts, both of which are installed on the old road; two fixing parts, both of which are installed on the old road; two sealing parts, both of which are installed on the old road; each connecting part includes a movable component installed on the old road; and a transmission component installed on the old road. The movable component includes a pre-reserved groove in the old road, within which a hollow threaded rod is installed. The outer wall of the hollow threaded rod has two connecting rings. The upper connecting ring is slidably connected to the hollow threaded rod, and the lower connecting ring is fixedly connected to it. Each of the two connecting rings has several hinge blocks fixedly connected to its outer wall. Each hinge block has a hinge rod hinged to its side away from the hollow threaded rod. The movable component and the transmission component are both located inside the old road, and the hinge blocks and hinge rods are arranged in a circular array.

[0006] Furthermore, the fixing part includes a pressing component mounted on the movable component; and a limiting component disposed on the movable component. The pressing component is located inside the hollow threaded rod, and the limiting component is located at the bottom of the hollow threaded rod.

[0007] Furthermore, the sealing part includes a sealing assembly installed on the old road; and an inner support assembly, wherein a plurality of inner support assemblies are provided, and the plurality of inner support assemblies are all disposed on the sealing assembly, and the inner support assemblies are located inside the sealing assembly.

[0008] Furthermore, the transmission assembly includes several hinge blocks 2, each hinged to one side of several hinge rods 1 away from the hollow threaded rod. Several friction plates are provided in the reserved groove. Several hinge blocks 2 are fixedly connected to several friction plates. Limiting components are provided on the hollow threaded rod. The friction plates are arranged in a circumferential array. Anti-slip pads are provided on the friction plates. The limiting component includes a hexagonal block 1 threadedly connected to the outer wall of the hollow threaded rod. A fixing ring is fixedly connected to the outer wall of the hollow threaded rod. A spring is sleeved on the outer wall of the hollow threaded rod. The top of the spring is fixedly connected to the fixing ring. A lower pressure ring is slidably connected to the outer wall of the hollow threaded rod. The bottom of the spring is fixedly connected to the lower pressure ring. A connecting rod is fixedly connected to the bottom of the lower pressure ring. The connecting rod passes through the hexagonal block 1, and the hexagonal block 1 contacts the connecting ring located above it.

[0009] Furthermore, the pressing assembly includes a fixing block fixedly connected to the inner wall of the hollow threaded rod, a threaded rod threadedly connected to the fixing block, a hexagonal block II fixedly connected to the top of the threaded rod, the threaded rod passing through the fixing block, and the threaded rod passing through the hollow threaded rod.

[0010] Furthermore, the limiting component includes a hinge block three fixedly connected to the bottom of the hollow threaded rod, a hinge block four hinged to the bottom of the hinge block three, a limiting plate fixedly connected to the bottom of the hinge block four, the threaded rod contacting the limiting plate, and the limiting plate contacting the geogrid.

[0011] Furthermore, the sealing assembly includes a sealing plate disposed above the old highway, a transmission rod passing through the sealing plate and rotatably connected to the sealing plate, a connecting plate fixedly connected to the bottom of the transmission rod, a conical spring sleeved on the outer wall of the transmission rod, the top of the conical spring fixedly connected to the sealing plate, the bottom of the conical spring fixedly connected to the connecting plate, and a limit box fixedly connected to the bottom of the sealing plate, the limit box extending into a reserved groove.

[0012] Furthermore, the inner support assembly includes a hinge block five fixedly connected to the outer wall of the connecting plate. A hinge rod two is hinged to the side of the hinge block five away from the transmission rod. A limit rod is hinged to the side of the hinge rod two away from the transmission rod. The limit rod extends to the outside of the limit box and contacts the inner wall of the reserved groove.

[0013] The present invention has the following beneficial effects: 1. This invention, by setting a connecting part, first excavates a reserved groove in the old roadbed and lays the geogrid on the new roadbed, and clarifies the installation and positioning of the hollow threaded rod; after inserting the hollow threaded rod into the reserved groove, rotate the hexagonal block one that is threaded with the rod body, so that it slides down along the rod body and pushes the upper connecting ring down; when the connecting ring moves down, through the hinge block one, hinge rod one and hinge block two, under the limiting action of the relevant components below, the axial thrust is converted into radial expansion force, and the friction plate is continuously pushed outward until the friction plate is completely attached to the inner wall of the reserved groove. The hollow threaded rod is anchored and fixed by frictional resistance. The stable fixing of the hollow threaded rod can form a rigid connection between the geogrid and the old roadbed. When the new roadbed settles, the geogrid can effectively transfer the stress to the old roadbed through the fixing point, avoid the geogrid displacement and relaxation, give full play to the reinforcement constraint effect, and reduce the lateral extrusion of the new roadbed. 2. This invention, by setting a fixing part, first places one end of the geogrid on the limiting plate, ensuring that the part of the geogrid to be limited is precisely aligned with the limiting plate; then, rotating hexagonal block two, because hexagonal block two is linked with the threaded rod, and the threaded rod and the fixing block are threadedly engaged, the rotation will cause the threaded rod to rotate synchronously on the fixing block and slide downward; during the downward movement of the threaded rod, it will apply downward pressure to one side of the limiting plate, and the limiting plate forms a linked support structure through hinge block three and hinge block four. When one side is pressed, the other side will tilt up accordingly, forming a " The lever-like action of "one-sided downward pressure and one-sided upward lifting" is used. As the threaded rod continues to apply downward pressure, the downward pressure side of the limiting plate will gradually approach the geogrid, eventually pressing one end of the geogrid firmly in the preset position, thus completing the limiting and fixing of the geogrid. The limiting plate achieves rigid pressure on the geogrid through the continuous pressure of the threaded rod. Compared with traditional backfilling or simple clips, it can prevent the geogrid from shifting or loosening due to uneven stress. Especially for the tensile stress generated by the geogrid during the settlement of new roadbeds, a stable constraint can be formed through the pressing point to prevent the geogrid from wrinkling locally or falling out of the fixed position. 3. This invention, by setting a sealing part, after limiting the geogrid, first initiates a pre-adjustment action by rotating the transmission rod: when the transmission rod rotates, it drives the connecting plate to rotate synchronously. The rotation of the connecting plate causes the conical spring to be subjected to torsional force and deform to store energy. At the same time, the hinge block five connected to the connecting plate rotates with it, thereby causing the hinge rod two to deflect at an angle; the angle change of the hinge rod two generates an inward pulling force, pulling the limiting rod to an inward retracted state, making room for the sealing component to enter the groove. Then, the sealing plate and the limiting box are placed into the reserved groove as a whole, and the previously rotated transmission rod is released: at this time, the energy-stored cone spring... The spring releases elastic potential energy, causing the connecting plate and transmission rod to rotate in the opposite direction and reset. The hinge block five and hinge rod two then return to their initial angles, while simultaneously generating an outward thrust on the limiting rod, causing the limiting rod to gradually reset and make tight contact with the inner wall of the reserved groove. The sealing plate and limiting box are fixed by the friction between the limiting rod and the groove wall, thus completing the sealing of the reserved groove. This effectively covers the opening of the reserved groove, preventing rainwater and debris from entering the groove and causing the roadbed fill to become damp, soften, or corrode. At the same time, the elastic fixing method of the limiting rod will not cause rigid compression damage to the inner wall of the reserved groove, ensuring the stability of the original structure of the old roadbed.

[0014] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial cross-sectional view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a partial cross-sectional view of the connecting part of the present invention; Figure 4 This is a partial cross-sectional view of the fixing part of the present invention. Figure 5 This is a partial cross-sectional view of the transmission assembly of the present invention; Figure 6 This is a partial cross-sectional view of the sealing part of the present invention; Figure 7 For the present invention Figure 5 A magnified structural diagram of A in the middle; Figure 8 For the present invention Figure 6 A magnified structural diagram of B in the diagram.

[0017] The attached diagram lists the components represented by each number as follows: In the diagram: 111, old road; 112, geogrid; 2, connecting part; 21, movable component; 211, reserved groove; 212, hollow threaded rod; 213, connecting ring; 214, hinge block one; 215, hinge rod one; 22, transmission component; 221, hinge block two; 222, friction plate; 223, hexagonal block one; 224, fixing ring; 225, spring; 226, pressure ring; 227, connecting rod; 3, fixing part; 31. 311. Pressing component; 312. Fixing block; 313. Threaded rod; 314. Hexagonal block two; 32. Restricting component; 325. Hinge block three; 326. Hinge block four; 327. Limiting plate; 4. Sealing part; 41. Sealing component; 418. Sealing plate; 419. Transmission rod; 410. Connecting plate; 411. Conical spring; 411. Limiting box; 42. Inner support component; 421. Hinge block five; 422. Hinge rod two; 423. Limiting rod. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-8As shown, the present invention is a transition buffer structure for new and old roadbeds, including an old road 111 and a geogrid 112 disposed below the old road 111, and further including: a connecting part 2, two of which are provided and both of which are installed on the old road 111; a fixing part 3, two of which are provided and both of which are installed on the old road 111; and a sealing part 4, two of which are provided and both of which are installed on the old road 111. The connecting part 2 includes a movable component 21, which is installed on the old road 111; and a transmission component 22, which is also installed on the old road 111. The movable component 21 includes a pre-reserved groove 211 formed in the old road 111, in which a hollow threaded rod 212 is provided. Two connecting rings 213 are provided on the outer wall of the hollow threaded rod 212. The upper connecting ring 213 is slidably connected to the hollow threaded rod 212, and the lower connecting ring 213 is fixedly connected to the hollow threaded rod 212. The outer wall of component 3 is fixedly connected with several hinge blocks 214. Each hinge block 214 has a hinge rod 215 hinged to the side away from the hollow threaded rod 212. The movable component 21 and the transmission component 22 are both located inside the old highway 111. The hinge blocks 214 and hinge rods 215 are arranged in a circular array. The transmission component 22 includes several hinge blocks 221 hinged to the side of each hinge rod 215 away from the hollow threaded rod 212. Several friction plates 222 and several hinge blocks are arranged in the reserved groove 211. The hollow threaded rod 212 is fixedly connected to several friction plates 222. A limiting component is provided on the hollow threaded rod 212. The friction plates 222 are arranged in a circumferential array and have anti-slip pads. The limiting component includes a hexagonal block 223 threaded to the outer wall of the hollow threaded rod 212. A retaining ring 224 is fixedly connected to the outer wall of the hollow threaded rod 212. A spring 225 is sleeved on the outer wall of the hollow threaded rod 212, with the top of the spring 225 fixedly connected to the retaining ring 224. A downward pressure ring 226 is slidably connected to the outer wall of the hollow threaded rod 212. The bottom of the spring 225 is fixedly connected to the lower pressure ring 226. The bottom of the lower pressure ring 226 is fixedly connected to the connecting rod 227. The connecting rod 227 passes through the hexagonal block 223. The hexagonal block 223 contacts the connecting ring 213 located above. By setting the connecting part 2, the stable fixation of the hollow threaded rod 212 can make the geogrid 112 form a rigid connection with the old roadbed. When the new roadbed settles, the geogrid can effectively transfer the stress to the old roadbed through the fixed point, avoid the geogrid displacement and relaxation, give full play to the reinforcement constraint effect, and reduce the lateral extrusion of the new roadbed.

[0020] The fixing part 3 includes a pressing component 31, which is mounted on the movable component 21; and a limiting component 32, which is disposed on the movable component 21. The pressing component 31 is located inside the hollow threaded rod 212, and the limiting component 32 is located at the bottom of the hollow threaded rod 212. The pressing component 31 includes a fixing block 311 fixedly connected to the inner wall of the hollow threaded rod 212. A threaded rod 312 is threadedly connected to the fixing block 311. A hexagonal block 313 is fixedly connected to the top of the threaded rod 312. The threaded rod 312 passes through the fixing block 311 and the hollow threaded rod. 212, the limiting component 32 includes a hinge block 321 fixedly connected to the bottom of the hollow threaded rod 212, a hinge block 4 322 hinged to the bottom of the hinge block 321, a limiting plate 323 fixedly connected to the bottom of the hinge block 4 322, the threaded rod 312 is in contact with the limiting plate 323, and the limiting plate 323 is in contact with the geogrid 112. By setting the fixing part 3, displacement and loosening of the geogrid due to uneven stress can be avoided. In particular, for the tensile stress generated by the geogrid when the new subgrade settles, a stable constraint can be formed by the pressing point to prevent the geogrid from wrinkling locally or falling out of the fixed position.

[0021] The sealing section 4 includes a sealing assembly 41, which is installed on the old road 111; and several inner support assemblies 42, each mounted on the sealing assembly 41 and located inside the sealing assembly 41. The sealing assembly 41 includes a sealing plate 411 positioned above the old road 111. A transmission rod 412 passes through the sealing plate 411 and is rotatably connected to it. A connecting plate 413 is fixedly connected to the bottom of the transmission rod 412. A conical spring 414 is fitted onto the outer wall of the transmission rod 412. The top of the conical spring 414 is fixedly connected to the sealing plate 411, and the bottom of the conical spring 414 is fixedly connected to the connecting plate 413. The bottom of the sealing plate 411... The inner support assembly 42 includes a hinge block 421 fixedly connected to the outer wall of the connecting plate 413. A hinge rod 422 is hinged to the side of the hinge block 421 away from the transmission rod 412. A limit rod 423 is hinged to the side of the hinge rod 422 away from the transmission rod 412. The limit rod 423 extends to the outside of the limit box 415 and contacts the inner wall of the reserved groove 211. By setting the sealing part 4, the opening of the reserved groove can be effectively covered to prevent rainwater and debris from entering the groove and causing the roadbed fill to become damp, softened or corroded. At the same time, the elastic fixing method of the limit rod will not cause rigid compression damage to the inner wall of the reserved groove, thus ensuring the stability of the original structure of the old roadbed.

[0022] In use, first, a pre-reserved groove 211 is drilled on the old roadbed, then the geogrid 112 is laid on the new roadbed. Next, the hollow threaded rod 212 is inserted into the pre-reserved groove 211. After insertion, the lower pressure ring 226 is pulled upwards. The lower pressure ring 226 then moves the connecting rod 227 upwards. As the lower pressure ring 226 moves upwards, it compresses the spring 225 through the fixing ring 224. With the upward movement of the connecting rod 227, it disengages from the hexagonal block 223. Then, the hexagonal block 223 is rotated, causing it to slide downwards on the hollow threaded rod 212. As it slides, it contacts the connecting ring 213 located above. Upon contact, the hexagonal block 223 pushes the connecting ring 213 downwards. At this point, the connecting ring 213 is hinged... Connecting block 214, hinge rod 215, and hinge block 221 push the friction plate 222 outward. At this time, the lower connecting ring 213, hinge block 214, hinge rod 215, and hinge block 221 restrict the friction plate 222, continuously pushing it outward. This pushing causes the friction plate 222 to adhere to the inner wall of the pre-reserved groove 211, thus fixing the hollow threaded rod 212. After fixing, the lower pressure ring 226 is released, and the spring 225 resets, pushing the lower pressure ring 226 downward. This push causes the connecting rod 227 to re-insert into hexagonal block 223, limiting its position and thus fixing the hollow threaded rod 212. After fixing, the geogrid is installed... The geogrid 112 is placed on the limiting plate 323. Then, the hexagonal block 313 is rotated, and the threaded rod 312 rotates on the fixed block 311. As it rotates, it slides downward, pressing down on the limiting plate 323. When one side of the limiting plate 323 is pressed, the other side of the limiting plate 323 is lifted by the hinge block 321 and hinge block 322. As the limiting plate 323 is pressed down, one end of the geogrid 112 is pressed down, thus achieving the effect of restricting the geogrid 112. After the geogrid 112 is restricted, the sealing plate 411 and the limiting box 415 are placed in the reserved slot 211 to seal it. When placing them, first rotate the transmission rod 412. At this time, the transmission rod 412 will rotate with the connecting plate 413. When the connecting plate 413 rotates, the conical spring 414 is subjected to a torsional force. As the connecting plate 413 rotates, it causes the hinge block 421 to rotate as well. Simultaneously, the hinge rod 422 is affected by the hinge block 421, causing a certain angle change. This angle change pulls the limiting rod 423 inward. After the limiting rod 423 retracts inward, the limiting box 415 is placed into the pre-reserved slot 211. Then, the transmission rod 412 is released. At this point, the conical spring 414, along with the connecting plate 413 and the transmission rod 412, returns to its original position. Consequently, the limiting rod 423 is pushed outward. As the limiting rod 423 returns to its original position, it contacts the inner wall of the pre-reserved slot 211, thus securing the sealing plate 411 and the limiting box 415.This achieves the effect of sealing the reserved slot 211.

[0023] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A transition buffer structure between old and new roadbeds, comprising an old road (111) and a geogrid (112) disposed beneath the old road (111), characterized in that, Also includes: Two connecting parts (2) are provided, and both connecting parts (2) are installed on the old highway (111); Fixing part (3), two fixing parts (3) are provided, and both fixing parts (3) are provided on the old highway (111); Two blocking parts (4) are provided, and both blocking parts (4) are installed on the old highway (111); The connecting part (2) includes a movable component (21) which is mounted on the old road (111); and A transmission assembly (22) is installed on the old road (111); The active component (21) includes a reserved slot (211) opened on the old road (111). A hollow threaded rod (212) is provided in the reserved slot (211). Two connecting rings (213) are provided on the outer wall of the hollow threaded rod (212). The upper connecting ring (213) is slidably connected to the hollow threaded rod (212), and the lower connecting ring (213) is fixedly connected to the hollow threaded rod (212). A plurality of hinge blocks (214) are fixedly connected to the outer wall of each of the two connecting rings (213). A hinge rod (215) is hinged on the side of each hinge block (214) away from the hollow threaded rod (212). Among them, the active component (21) and the transmission component (22) are both located inside the old road (111), and the first articulated block (214) and the first articulated rod (215) are both arranged in a circular array.

2. The transition buffer structure between old and new roadbeds according to claim 1, characterized in that, The fixing part (3) includes a pressing component (31), which is mounted on the movable component (21); as well as A limiting component (32) is disposed on the active component (21); The pressing component (31) is located inside the hollow threaded rod (212), and the limiting component (32) is located at the bottom of the hollow threaded rod (212).

3. The transition buffer structure between old and new roadbeds according to claim 2, characterized in that, The sealing part (4) includes a sealing assembly (41) installed on the old road (111); and An inner support assembly (42) is provided in a plurality of such assemblies, and each of the plurality of inner support assemblies (42) is provided on a sealing assembly (41); The inner support assembly (42) is located inside the sealing assembly (41).

4. The transition buffer structure between old and new roadbeds according to claim 3, characterized in that, The transmission assembly (22) includes several hinge blocks (221) that are respectively hinged to a number of hinge rods (215) on the side away from the hollow threaded rod (212). Several friction plates (222) are provided in the reserved groove (211). Several hinge blocks (221) are respectively fixedly connected to several friction plates (222). Limiting elements are provided on the hollow threaded rod (212). Among them, the friction plates (222) are arranged in a circular array, and anti-slip pads are provided on the friction plates (222).

5. A transition buffer structure between old and new roadbeds according to claim 4, characterized in that, The pressing assembly (31) includes a fixing block (311) fixedly connected to the inner wall of the hollow threaded rod (212), the threaded rod (312) is threadedly connected to the fixing block (311), and a hexagonal block (313) is fixedly connected to the top of the threaded rod (312). Among them, the threaded rod (312) passes through the fixed block (311), and the threaded rod (312) passes through the hollow threaded rod (212).

6. A transition buffer structure between old and new roadbeds according to claim 5, characterized in that, The limiting component (32) includes a hinge block three (321) fixedly connected to the bottom of the hollow threaded rod (212), and a hinge block four (322) is hinged to the bottom of the hinge block three (321), and a limit plate (323) is fixedly connected to the bottom of the hinge block four (322). Among them, the threaded rod (312) is in contact with the limiting plate (323), and the limiting plate (323) is in contact with the geogrid (112).

7. A transition buffer structure between old and new roadbeds according to claim 6, characterized in that, The sealing assembly (41) includes a sealing plate (411) disposed above the old road (111), a transmission rod (412) passing through the sealing plate (411), the transmission rod (412) being rotatably connected to the sealing plate (411), a connecting plate (413) being fixedly connected to the bottom of the transmission rod (412), a conical spring (414) being sleeved on the outer wall of the transmission rod (412), the top of the conical spring (414) being fixedly connected to the sealing plate (411), the bottom of the conical spring (414) being fixedly connected to the connecting plate (413), and a limit box (415) being fixedly connected to the bottom of the sealing plate (411). The limiting box (415) extends into the reserved slot (211).

8. A transition buffer structure between old and new roadbeds according to claim 7, characterized in that, The inner support assembly (42) includes a hinge block five (421) fixedly connected to the outer wall of the connecting plate (413). A hinge rod two (422) is hinged on the side of the hinge block five (421) away from the transmission rod (412). A limit rod (423) is hinged on the side of the hinge rod two (422) away from the transmission rod (412). The limiting rod (423) extends outside the limiting box (415) and contacts the inner wall of the reserved groove (211).

9. A transition buffer structure between old and new roadbeds according to claim 8, characterized in that, The limiting component includes a hexagonal block (223) threaded to the outer wall of a hollow threaded rod (212), a fixing ring (224) fixedly connected to the outer wall of the hollow threaded rod (212), a spring (225) sleeved on the outer wall of the hollow threaded rod (212), the top of the spring (225) fixedly connected to the fixing ring (224), a lower pressure ring (226) slidably connected to the outer wall of the hollow threaded rod (212), the bottom of the spring (225) fixedly connected to the lower pressure ring (226), and a connecting rod (227) fixedly connected to the bottom of the lower pressure ring (226), the connecting rod (227) passing through the hexagonal block (223). Among them, hexagonal block 1 (223) is in contact with the connecting ring (213) located above.

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