Bridge approach ramp device

Abstract

The application relates to the technical field of road and bridge construction equipment, in particular to a bridge head clamping plate uphill device, which comprises a base, a ramp inclined plate arranged on the base, one end of the ramp inclined plate close to the base being hinged on the base, a driving piece arranged on the base and used for driving the ramp inclined plate to rotate, a supporting assembly arranged on the base and used for supporting the ramp inclined plate, the other end of the ramp inclined plate away from the base extending to outside of the base, a first hydraulic cylinder hinged at the other end of the ramp inclined plate away from the base, a supporting plate arranged at the bottom of the first hydraulic cylinder, and an adjusting assembly arranged on the ramp inclined plate and used for adjusting the width of the ramp inclined plate. The application has the effect of avoiding waste of mixed fillers.

Description

Technical Field

[0001] This application relates to the field of road and bridge construction technology, and in particular to a ramp device for bridge approach slabs. Background Technology

[0002] Due to the influence of geological forces and the difference in stiffness between roads and bridges, uneven settlement at bridge abutments is inevitable, resulting in differential settlement. This is especially true at the junction of newly constructed roads and bridges, where significant height differences frequently lead to vehicle bouncing, sometimes causing vehicles to leap into the air before landing heavily, particularly in cases of stepped drops between the bridge deck and the road surface. Therefore, approach slabs are typically installed at the bridge abutments to mitigate the adverse effects of settlement. The main body of the approach slab is constructed of reinforced concrete. A sleeper beam is pre-cast on the roadbed, and then the approach slab is erected on the roadbed before connecting to the bridge deck.

[0003] However, there is a height difference between the newly constructed bridge approach slab and the roadbed, which requires the use of mixed material to fill the ramp to facilitate the passage of vehicles and other construction equipment. However, during the subsequent road surface construction, the mixed filler needs to be removed before the road surface is formed, resulting in a large amount of waste of the mixed filler. Summary of the Invention

[0004] To avoid the waste of mixed filler, this application provides a ramp device for bridge approach slabs.

[0005] The technical solution for the bridge approach ramp device provided in this application is as follows:

[0006] A ramp device for a bridge approach includes a base, on which a ramp slope is disposed. One end of the ramp slope near the base is hinged to the base. A driving component for rotating the ramp slope is disposed on the base. A support assembly for supporting the ramp slope is disposed on the base. The end of the ramp slope away from the base extends beyond the base. A first hydraulic cylinder is hinged to the end of the ramp slope away from the base. A support plate is disposed at the bottom of the first hydraulic cylinder. An adjustment assembly for adjusting the width of the ramp slope is disposed on the ramp slope.

[0007] By adopting the above technical solution, the device is hoisted to the connection between the roadbed and the bridge approach slab. The angle of the ramp is adjusted by the drive component so that the upper part of the ramp is flush with the bridge approach slab. Then, the piston rod of the first hydraulic cylinder is extended to abut the support plate against the bolster beam, thus forming a temporary connection channel to facilitate the passage of vehicles and equipment. It is also convenient for disassembly and reuse, and there is no need to use mixed filler, thus avoiding the waste of mixed filler.

[0008] Optionally, the driving component includes a second hydraulic cylinder mounted on the base, a groove is provided at the bottom of the ramp, a first slider is slidably connected in the groove, the first slider slides along the length of the ramp, and the piston rod of the second hydraulic cylinder is hinged to the first slider.

[0009] By adopting the above technical solution, when it is necessary to adjust the angle of the ramp slab, the piston rod of the second hydraulic cylinder extends and drives the first slider to move upward. While the first slider slides in the groove, it drives the ramp slab to rotate and rise, thereby realizing the adjustment of the ramp slab angle to suit different height differences between the bridge approach slab and the roadbed.

[0010] Optionally, the support assembly includes a plurality of first support rods disposed on the base, a plurality of second sliders slidably disposed on the ramp plate, the second sliders being slidably connected to the slide groove, each of the plurality of second sliders being provided with a second support rod, the plurality of second support rods being provided in a one-to-one correspondence with the plurality of first support rods, the second support rods being slidably inserted through the first support rods, and the first support rods being provided with fasteners for fixing the second support rods.

[0011] By adopting the above technical solution, the second support rod is slidably connected inside the first support rod. When the ramp plate rotates, the second slider drives the second support rod to slide inside the first support rod. The second support rod is then fixed inside the first support rod by a fixing member, thereby achieving support for the ramp plate and improving the load-bearing capacity of the ramp plate.

[0012] Optionally, the fixing member includes a plurality of support blocks slidably disposed within the first support rod. The support blocks are arranged symmetrically in pairs and stacked along the length direction of the first support rod. The second support rod abuts against the uppermost support block. The first support rod is provided with an elastic element for driving the support block to slide toward the middle of the first support rod. The first support rod is also provided with an adjusting element for adjusting the position of the support block.

[0013] By adopting the above technical solution, when the second support rod moves upward, the support block that is separated from the side wall of the second support rod moves toward the middle of the first support rod, so that the bottom of the second support rod remains in contact with the support block, thereby adapting to the adjustment of the second support rod at different heights.

[0014] Optionally, the elastic element includes a plurality of springs disposed within the first support rod, wherein the plurality of springs are disposed corresponding to a plurality of support blocks, one end of the spring is connected to the support block, and the other end is connected to the first support rod.

[0015] By adopting the above technical solution, the spring drives the support block to move toward the inside of the first support rod. After the second support rod rises, the support block automatically moves to the bottom of the second support rod under the action of the spring force, so as to support the second support rod.

[0016] Optionally, the adjusting component includes a bidirectional lead screw rotatably mounted on the first support rod, with adjusting rods threaded to both ends of the bidirectional lead screw. An adjusting groove is provided on the support block, and a connecting rod is provided on the adjusting rod. The connecting rod slides through the support block located on the same side of the first support rod, and slides through the adjusting groove. The sliding direction of the connecting rod is parallel to the sliding direction of the support block.

[0017] By adopting the above technical solution, rotating the bidirectional lead screw causes the two adjusting rods to slide relative to each other, and the two adjusting rods cause the connecting rod to slide relative to each other, thereby causing the support blocks on both sides to slide to both sides, separating the support blocks from the second support rod, so as to facilitate the descent of the second support rod.

[0018] Optionally, the adjustment assembly includes widening plates disposed on both sides of the ramp slab, the widening plates being hinged to both sides of the ramp slab, and diagonal bracing rods being hinged to the widening plates. A vertical plate is disposed at the bottom of the side of the ramp slab, and a fixing block is disposed on the vertical plate. A fixing groove is provided on the fixing block, and the end of the diagonal bracing rod is inserted into the fixing groove.

[0019] By adopting the above technical solution, the widening plate is rotated parallel to the ramp slope, and the diagonal bracing rod is inserted into the fixing groove to fix the widening plate, thereby facilitating the widening of the ramp slope and improving the applicability of the device.

[0020] Optionally, a connecting shaft is slidably passed through the widening plate, the diagonal brace is connected to the connecting shaft, a limiting groove is opened on the side of the ramp slab, the limiting groove is an L-shaped groove, and a limiting block is provided on the diagonal brace. When the diagonal brace is located in the limiting groove and the limiting block abuts against the top wall of the ramp slab, the widening plate is located above the ramp slab.

[0021] By adopting the above technical solution, the widened plate is rotated above the ramp slab, the diagonal brace is rotated into the limiting groove, and the connecting shaft is moved to move the diagonal brace into the L-shaped interior of the limiting groove. The limiting block abuts against the ramp slab, thereby using the widened plate as a guardrail.

[0022] Optionally, the base is provided with a guide plate, the bottom of which is cut into an inclined surface. One end of the upper surface of the guide plate is flush with the end of the ramp plate near the base, and the other end is flush with the ground.

[0023] By adopting the above technical solution, the guide plate is located between the height difference between the hinged end of the ramp slab and the ground roadbed, eliminating the existence of steps and thus facilitating vehicle passage.

[0024] Optionally, an extension plate is provided at the end of the ramp plate away from the base, and the extension plate is hinged to the ramp plate.

[0025] By adopting the above technical solution, the extension plate overlaps with the bridge approach plate, thereby avoiding the gap between the ramp slab and the bridge approach plate, so as to facilitate vehicle passage.

[0026] In summary, the ramp device for bridge approach slabs according to the embodiments of this application has at least the following beneficial effects:

[0027] 1. The device is hoisted to the connection between the roadbed and the bridge approach slab. The angle of the ramp is adjusted by the drive mechanism so that the height of the upper part of the ramp is flush with the bridge approach slab. Then, the piston rod of the first hydraulic cylinder is extended to abut the support plate against the bolster beam, thus forming a temporary connection channel to facilitate the passage of vehicles and equipment. It is easy to disassemble and reuse, and there is no need to use mixed filler, thus avoiding the waste of mixed filler.

[0028] 2. When the second support rod moves upward, the support block, which is separated from the side wall of the second support rod, moves toward the middle of the first support rod, so that the bottom of the second support rod remains in contact with the support block, thereby adapting to the adjustment of the second support rod at different heights. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of the ramp device on the bridge approach slab according to an embodiment of this application;

[0031] Figure 2 yes Figure 1 Enlarged structural diagram of section A;

[0032] Figure 3 This is a partial cross-sectional view of the ramp device on the bridge approach slab according to an embodiment of this application;

[0033] Figure 4 This is a cross-sectional view of the first support rod according to an embodiment of this application;

[0034] Figure 5 yes Figure 1 Enlarged structural diagram of section B.

[0035] Explanation of reference numerals in the attached figures:

[0036] 01-Bridge approach slab; 02-Sleeper beam; 1-Base; 2-Ramp ramp; 3-First hydraulic cylinder; 4-Support plate; 5-Second hydraulic cylinder; 6-Slide groove; 7-First slider; 8-First support rod; 9-Second slider; 10-Second support rod; 11-Support block; 12-Spring; 13-Double lead screw; 14-Adjusting rod; 15-Connecting rod; 16-Wide plate; 17-Diagonal brace; 18-Vertical plate; 19-Fixing block; 20-Fixing groove; 21-Connecting shaft; 22-Limiting groove; 23-Guide plate; 24-Extension plate; 25-Connecting groove; 26-Moving groove; 27-Limiting block; 28-Adjusting groove. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] This application discloses a ramp device for bridge approach slabs. Please refer to... Figure 1 and Figure 2 The ramp device on the bridge approach slab includes a base 1, on which a ramp slab 2 is connected. The ramp slab 2 is a steel plate, and reinforcing ribs are welded and fixed to the bottom of the steel plate to improve its load-bearing capacity. One end of the ramp slab 2 near the base 1 is rotatably connected to the base 1. For example, the end of the ramp slab 2 near the base 1 is hinged to the base 1 via a hinge or similar structure, and the hinge axis of the ramp slab 2 is parallel to the width direction of the base 1. A drive unit for rotating the ramp slab 2 is installed on the base 1, and a support assembly for supporting the ramp slab 2 is provided on the base 1. The end of the ramp slab 2 away from the base 1 extends beyond the base 1, and the projected length of the ramp slab 2 on the base 1 is greater than the length of the base 1. Thus, when the sleeper beam 02 under the bridge approach slab 01 protrudes onto the roadbed, the ramp slab 2 can still overlap the bridge approach slab 01. A first hydraulic cylinder 3 is hinged to the end of the ramp slab 2 away from the base 1. The piston rod of the first hydraulic cylinder 3 is hinged to the bottom end of the ramp slab 2, and a support plate 4 is welded and fixed to the bottom of the first hydraulic cylinder 3. When the bolster beam 02 protrudes from the roadbed, the support plate 4 abuts against the bolster beam 02; when the bolster beam 02 does not protrude from the roadbed, the support plate 4 abuts against the roadbed. An adjustment assembly for adjusting the width of the ramp slab 2 is provided on the ramp slab 2.

[0044] Please refer to Figure 1 and Figure 3The driving component includes a second hydraulic cylinder 5 fixedly mounted on the base 1, with one end of the second hydraulic cylinder 5 close to the first hydraulic cylinder 3. A groove 6 is provided at the bottom of the ramp slab 2, extending along the length of the ramp slab 2. A first slider 7 is slidably connected within the groove 6, sliding along the length of the ramp slab 2 within the groove 6. The piston rod of the second hydraulic cylinder 5 is hinged to the first slider 7. Optionally, the first hydraulic cylinder 3 and the second hydraulic cylinder 5 can be hand-cranked jacks, or hydraulic cylinders with an external power source can be used. When the angle of the ramp slab 2 needs to be adjusted, the piston rod of the second hydraulic cylinder 5 extends, causing the first slider 7 to move upwards. As the first slider 7 slides within the groove 6, it simultaneously causes the ramp slab 2 to rotate and rise, thereby achieving adjustment of the angle of the ramp slab 2 to accommodate different height differences between the bridge approach slab 01 and the roadbed.

[0045] Reference Figure 2 and Figure 3 The support assembly includes multiple first support rods 8 welded and fixed to the base 1. Each first support rod 8 is a hollow rod. Multiple second sliders 9 are slidably connected to the ramp plate 2. The multiple second sliders 9 are slidably disposed in the slide groove 6, that is, each second slider 9 can slide along the length direction of the slide groove 6. Each second slider 9 is hinged with a second support rod 10. The multiple second support rods 10 are arranged one-to-one with the multiple first support rods 8. The second support rods 10 slide through the first support rods 8. The sliding direction of the second support rods 10 is vertical. The first support rods 8 are provided with fixing members for fixing the second support rods 10.

[0046] The second support rod 10 is slidably connected inside the first support rod 8. When the ramp slab 2 rotates, the second slider 9 drives the second support rod 10 to slide inside the first support rod 8. Then, the second support rod 10 is fixed inside the first support rod 8 by a fixing member, thereby achieving support for the ramp slab 2 and improving the load-bearing capacity of the ramp slab 2.

[0047] Reference Figures 2-4 The fixing component includes multiple support blocks 11 that are slidably connected within the first support rod 8. The first support rod 8 has connecting grooves 25 on both opposite sides. The support blocks 11 are slidably connected within the connecting grooves 25. The support blocks 11 are arranged symmetrically in pairs and stacked along the length of the first support rod 8. The bottom of the second support rod 10 abuts against the uppermost support block 11. The first support rod 8 is provided with an elastic element for driving the support blocks 11 to slide toward the middle of the first support rod 8. The first support rod 8 is also provided with an adjusting element for adjusting the position of the support blocks 11.

[0048] Reference Figures 2-4The elastic element includes multiple springs 12 connected within the first support rod 8. Each spring 12 corresponds to a multiple support block 11, which is a T-shaped block. The springs 12 are located on opposite sides of each support block 11, with one end fixedly connected to the support block 11 and the other end fixedly connected to the first support rod 8. The adjusting element includes a bidirectional lead screw 13 rotatably connected to the first support rod 8. The threads at both ends of the bidirectional lead screw 13 have opposite directions. Adjusting rods 14 are threaded to both ends of the bidirectional lead screw 13. An adjusting groove 28 is provided on the support block 11, penetrating the support block 11. A connecting rod 15 is welded and fixed to the adjusting rod 14. The connecting rod 15 is a ring-shaped rod that slides through multiple support blocks 11 located on the same side of the first support rod 8. The sliding direction of the connecting rod 15 is parallel to the sliding direction of the support block 11. In this application, the thickness of the support block 11 can be set according to the actual situation to minimize the gap between the bottom of the second support rod 10 and the support block 11.

[0049] Reference Figure 2 , Figure 3 and Figure 4 Spring 12 drives support block 11 to move inward toward the interior of first support rod 8, causing support block 11 to abut against the side of the portion of second support rod 10 inserted into first support rod 8. Support block 11 at the bottom of second support rod 10 moves to the middle of first support rod 8 under the action of spring 12, and the bottom of second support rod 10 abuts against support block 11 below it. When ramp 2 rises, second support rod 10 moves upward, and support block 11, which abuts against the side of second support rod 10, disengages from second support rod 10 and moves inward toward the interior of first support rod 8 under the action of spring 12. This automatic adjustment keeps the bottom of second support rod 10 abutting against support block 11, providing support and adapting to different height adjustments. When the ramp slab 2 needs to descend, first rotate the double-acting screw 13. The double-acting screw 13 drives the two adjusting rods 14 to slide relative to each other. The two adjusting rods 14 drive the connecting rod 15 to slide relative to each other. The connecting rod 15 first drives the bottom support block 11 to move to both sides, freeing up the space inside the first support rod 8 so that the second support rod 10 can move downward. Then adjust the position of the second support rod 10, and then adjust the double-acting screw 13 so that the connecting rod 15 separates from the end wall of the adjusting groove 28 of the support block 11. Under the action of the spring 12, the support block 11 returns to abutting against the side wall of the second support rod 10 or moves to the middle of the first support rod 8, thus supporting the second support rod 10.

[0050] Reference Figure 1 and Figure 2The adjustment assembly includes widening plates 16 connected to both sides of the ramp slab 2. The widening plates 16 are hinged to both sides of the ramp slab 2 in the width direction of the base 1, with the hinge axis of the widening plates 16 parallel to the length direction of the ramp slab 2. Diagonal braces 17 are hinged to the widening plates 16, with their hinge axes parallel to the hinge axis of the widening plates 16. Vertical plates 18 are welded and fixed to the bottom side of the ramp slab 2, and fixing blocks 19 are welded and fixed to the vertical plates 18. Fixing slots 20 are provided on the fixing blocks 19. The diagonal braces 17 are L-shaped rods, with their ends inserted into the fixing slots 20. Rotating the widening plates 16 parallel to the ramp slab 2 and inserting the diagonal braces 17 into the fixing slots 20 secures the widening plates 16, thereby facilitating the widening of the ramp slab 2 and improving the applicability of the device.

[0051] Reference Figure 1 , Figure 2 and Figure 5 A connecting shaft 21 slides through the widened plate 16, and a diagonal brace 17 is fixedly connected to the connecting shaft 21. Multiple moving slots 26 are formed on the widened plate 16, each corresponding to a diagonal brace 17. The diagonal brace 17 is located within the moving slot 26. A limiting slot 22 is formed on the side of the ramp slab 2. The limiting slot 22 is L-shaped, and the width of the moving slot 26 is greater than or equal to the length of the L-shaped side of the limiting slot 22. A limiting block 27 is welded and fixed to the diagonal brace 17. When the diagonal brace 17 is located within the limiting slot 22, the L-shaped end of the diagonal brace 17 abuts against the bottom of the limiting slot 22, and the limiting block 27 abuts against the top wall of the ramp slab 2. The widened plate 16 is located above the ramp slab 2.

[0052] Rotate the widened plate 16 above the ramp slab 2, rotate the connecting shaft 21, rotate the diagonal brace 17 into the limiting groove 22, and move the connecting shaft 21 laterally to move the diagonal brace 17 into the L-shaped interior of the limiting groove 22. The L-shaped end of the diagonal brace 17 abuts against the bottom of the limiting groove 22, and the limiting block 27 abuts against the top wall of the ramp slab 2, thereby using the widened plate 16 as a guardrail.

[0053] Reference Figure 1 , Figure 2 and Figure 5 A guide plate 23 is welded and fixed to the end of the base 1. The bottom of the guide plate 23 is cut into a bevel. One end of the upper surface of the guide plate 23 is flush with the end of the ramp slab 2 near the base 1, and the other end is flush with the ground. The guide plate 23 is located between the height difference between the hinged end of the ramp slab 2 and the ground roadbed, eliminating the presence of steps. An extension plate 24 is connected to the end of the ramp slab 2 away from the base 1. The extension plate 24 is hinged to the ramp slab 2. The cross-section of the extension plate 24 is triangular, which allows the ramp slab 2 to smoothly transition to the bridge approach slab 01, thereby avoiding the gap between the ramp slab 2 and the bridge approach slab 01, so as to facilitate vehicle passage.

[0054] The implementation principle of the bridge approach ramp device in this application embodiment is as follows:

[0055] The device is hoisted to the connection point between the roadbed and the bridge approach slab 01. The second hydraulic cylinder 5 is controlled to extend its piston rod, adjusting the angle of the ramp slab 2 so that the height of the upper end of the ramp slab 2 is flush with the bridge approach slab 01. The second support rod 10 automatically completes the adjustment and forms a stable support. Then, the first hydraulic cylinder 3 is adjusted to extend its piston rod, and the support plate 4 is abutted against the sleeper beam 02, thus forming a temporary connecting passage to facilitate the passage of vehicles and equipment, and to facilitate disassembly, assembly, and reuse.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A ramp device for bridge approach slabs, characterized in that, include: A base (1) is provided with a ramp (2), one end of the ramp (2) near the base (1) is hinged to the base (1), and an adjustment component for adjusting the width of the ramp (2) is provided on the ramp (2). The end of the ramp (2) away from the base (1) extends outside the base (1), and a first hydraulic cylinder (3) is rotatably connected to the end of the ramp (2) away from the base (1). A support plate (4) is provided at the bottom of the first hydraulic cylinder (3). The base (1) is provided with a driving component for driving the ramp (2) to rotate and a support component for supporting the ramp (2). The support assembly includes a plurality of first support rods (8) disposed on the base (1), a plurality of second sliders (9) slidably disposed on the ramp plate (2), the second sliders (9) slidably connected in the groove (6), a second support rod (10) is disposed on each of the plurality of second sliders (9), the plurality of second support rods (10) are disposed in a one-to-one correspondence with the plurality of first support rods (8), the second support rods (10) slidably pass through the first support rods (8), and the first support rods (8) are provided with fixing members for fixing the second support rods (10); The fixing component includes a plurality of support blocks (11) slidably disposed within the first support rod (8). The plurality of support blocks (11) are arranged symmetrically in pairs. The symmetrical support blocks (11) are stacked along the length direction of the first support rod (8). The second support rod (10) abuts against the uppermost support block (11). The first support rod (8) is provided with an elastic element for driving the support block (11) to slide toward the middle of the first support rod (8). The first support rod (8) is provided with an adjusting element for adjusting the position of the support block (11).

2. The ramp device for bridge approach slabs according to claim 1, characterized in that: The driving component includes a second hydraulic cylinder (5) mounted on the base (1), a groove (6) is provided at the bottom of the ramp (2), a first slider (7) is slidably connected in the groove (6), the first slider (7) slides along the length of the ramp (2), and the piston rod of the second hydraulic cylinder (5) is hinged to the first slider (7).

3. The ramp device for bridge approach slabs according to claim 1, characterized in that: The elastic element includes a plurality of springs (12) disposed in the first support rod (8). The plurality of springs (12) are disposed corresponding to a plurality of support blocks (11). One end of the spring (12) is connected to the support block (11) and the other end is connected to the first support rod (8).

4. The ramp device for bridge approach slabs according to claim 1, characterized in that: The adjusting component includes a bidirectional lead screw (13) rotatably mounted on the first support rod (8). Both ends of the bidirectional lead screw (13) are threadedly connected to adjusting rods (14). An adjusting groove (28) is provided on the support block (11). A connecting rod (15) is provided on the adjusting rod (14). The connecting rod (15) slides through the support block (11) located on the same side of the first support rod (8). The connecting rod (15) slides through the adjusting groove (28). The sliding direction of the connecting rod (15) is parallel to the sliding direction of the support block (11).

5. The ramp device for bridge approach slabs according to claim 1, characterized in that: The adjustment assembly includes widening plates (16) set on both sides of the ramp slab (2), the widening plates (16) are hinged to both sides of the ramp slab (2), the widening plates (16) are hinged to the diagonal bracing rods (17), the bottom side of the ramp slab (2) is provided with a vertical plate (18), the vertical plate (18) is provided with a fixing block (19), the fixing block (19) is provided with a fixing groove (20), and the end of the diagonal bracing rod (17) is inserted into the fixing groove (20).

6. The ramp device for bridge approach slabs according to claim 5, characterized in that: A connecting shaft (21) is slidably passed through the widened plate (16), and the diagonal brace (17) is connected to the connecting shaft (21). A limiting groove (22) is opened on the side of the ramp slab (2). The limiting groove (22) is an L-shaped groove. A limiting block (27) is provided on the diagonal brace (17). When the diagonal brace (17) is located in the limiting groove (22) and the limiting block (27) abuts against the top wall of the ramp slab (2), the widened plate (16) is located above the ramp slab (2).

7. The ramp device for bridge approach slabs according to claim 1, characterized in that: A guide plate (23) is provided on the base (1). The bottom of the guide plate (23) is cut into a bevel. One end of the upper surface of the guide plate (23) is flush with the end of the ramp (2) near the base (1), and the other end is flush with the ground.

8. The ramp device for bridge approach slabs according to claim 1, characterized in that: An extension plate (24) is provided at one end of the ramp slab (2) away from the base (1), and the extension plate (24) is hinged to the ramp slab (2).

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