A splicing structure for new and old bridges in highway reconstruction and expansion

Abstract

This invention belongs to the field of highway expansion technology, specifically a splicing structure for new and old bridges in highway reconstruction and expansion. It includes a lifting frame, with a first lifting rope at the top of the lifting frame, a transition piece at the bottom of the first lifting rope, a transition plate at the bottom of the transition piece, and multiple second lifting ropes on the bottom surface of the transition plate. This invention's splicing structure for new and old bridges in highway reconstruction and expansion utilizes a top rod with a first braking block at its bottom. When the first braking block presses against the surface of the steel beam, friction is generated between the top rod and the steel beam. The top rod passes through a support plate, which is fixed to the lifting frame via a connecting frame. Since the lifting frame remains stationary when moving, the first braking block can limit the swaying of the steel beam through friction, causing the swaying steel beam to quickly come to a stop. Once stationary, the steel beam moves downwards to a designated position, achieving rapid splicing of the new and old steel beams and improving the splicing efficiency of the new and old steel beams.

Description

Technical Field

[0001] This invention belongs to the field of highway expansion technology, specifically a splicing structure for new and old bridges in the reconstruction and expansion of expressways. Background Technology

[0002] Expressways are multi-lane highways that are dedicated to the separate travel of automobiles in different directions and with fully controlled access. They are classified as high-grade highways. During the use of expressways, when the traffic volume is too large, it is necessary to expand the expressway. Since expressways have bridge sections, the bridges need to be expanded simultaneously when the expressway is expanded.

[0003] Specifically, during bridge expansion, a crane is used to lift the steel beams for the expansion. These beams are then moved to a position where they connect with the existing bridge beams, allowing the old and new beams to be joined together. The lifting structure used in this process is the same structure used to join the old and new beams. During actual lifting, as the beams are moved to the designated position by the hoisting ropes, they sway for a period due to inertia. When the swaying stops, the beams are continued to be lowered to the designated position, completing the joining process. This entire process takes considerable time, and the efficiency of joining the old and new beams needs further improvement.

[0004] Therefore, the present invention provides a splicing structure for new and old bridges in the reconstruction and expansion of highways. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a splicing structure for new and old bridges in highway reconstruction and expansion, including a lifting frame, a first lifting rope at the top of the lifting frame, a transition piece at the bottom end of the first lifting rope, a transition plate at the bottom end of the transition piece, and a plurality of second lifting ropes on the bottom surface of the transition plate; the bottom end of the second lifting rope is used to fix the steel beam.

[0007] A connecting frame is fixed to the top of the lifting frame, and a support plate is provided on the bottom surface of the connecting frame. A pair of first hydraulic cylinders are symmetrically installed on the bottom surface of the support plate based on the center line. The output end of the first hydraulic cylinder extends through to the top of the support plate. A connecting rod is provided at the end of the output end of the first hydraulic cylinder, and a push rod is provided at the end of the connecting rod away from the first hydraulic cylinder. The bottom end of the push rod passes through the support plate and the transition plate respectively. A first braking block is provided at the bottom end of the push rod.

[0008] Preferably, an extension rod is provided on the surface of the top rod and below the transition plate, and a first connecting member is provided between the extension rod and the top rod; a second braking block is provided at the bottom end of the extension rod, and the bottom surface of the second braking block is at the same height as the bottom surface of the first braking block.

[0009] Preferably, the top surface of the second brake block is provided with a pair of receiving holes; a suction cup is provided inside the receiving hole, the opening of the suction cup is located below the receiving hole, and multiple air pumps are installed on the top surface of the extension rod, and a conduit is provided between the air pump's suction end and the suction cup.

[0010] Preferably, the first connecting member includes a second hydraulic cylinder, and a connecting rod is provided between the second hydraulic cylinder and the extension rod; the extension rod passes through the top rod.

[0011] Preferably, the top rod includes a first connecting rod, a second connecting rod, and a third connecting rod; a second connecting member is provided between the first connecting rod and the second connecting rod; a third connecting member is provided between the second connecting rod and the third connecting rod; the second connecting member includes a support spring, and multiple support springs are provided, with the top end installed at the bottom end of the first connecting rod and the bottom end installed at the top end of the second connecting rod; the multiple support springs are arranged in a ring between the first connecting rod and the second connecting rod.

[0012] Preferably, the top end of the second connecting rod is provided with a slot, and the bottom end of the first connecting rod is provided with a block, the diameter of which is smaller than the inner diameter of the slot.

[0013] Preferably, the annular inner wall of the card slot is evenly provided with multiple embedding slots, and an embedding block is inserted into the embedding slot. A buffer spring is provided between the embedding block and the inner wall of the embedding slot. The top surface of the embedding block located outside the embedding slot is set as an inclined surface. Multiple pressure plates are arranged in an annular shape on the side of the card block. When the card block is vertically inserted into the card slot, the end of the embedding block away from the embedding slot and the end of the pressure plate away from the card block do not have compressive contact.

[0014] Preferably, the third connecting member includes a receiving block, the top surface of which has a receiving groove, the bottom end of the second connecting rod is inserted into the receiving groove on the top surface of the receiving block and contacts the bottom wall of the receiving groove; the top end of the third connecting rod is fixedly connected to the bottom surface of the receiving block; a plurality of limiting springs are provided between the second connecting rod located in the receiving groove and the inner wall of the receiving groove, and the limiting springs are evenly distributed in a ring in the receiving groove.

[0015] Preferably, the limiting spring is an inflatable air spring; a connecting plate is provided on the side of the third link, and a connecting rod is provided on the top surface of the connecting plate; the same structure is symmetrically provided on the side of the second link based on the receiving block.

[0016] Preferably, the top rod, the support plate, and the connecting frame are all made of hard alloy steel.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The present invention discloses a splicing structure for new and old bridges in highway reconstruction and expansion. By setting up a top rod, when splicing new and old steel beams, the new steel beam is fixed by a second lifting rope. The steel beam is then moved to a designated position using a lifting frame. When the lifting frame stops moving, the steel beam will sway due to inertia. At this time, a first hydraulic cylinder is activated, and its output end drives the top rod downwards. The top rod stops when a first braking block at its bottom presses against the surface of the steel beam. Friction is generated between the first braking block and the steel beam when it presses against the surface. The top rod passes through a support plate, which is fixed to the lifting frame via a connecting frame. Since the lifting frame remains stationary when it stops moving, the first braking block can limit the swaying of the steel beam through friction, causing the swaying steel beam to quickly come to a stop. The stationary steel beam then moves downwards to the designated position, achieving rapid splicing of new and old steel beams and improving the splicing efficiency.

[0019] 2. The present invention provides a splicing structure for new and old bridges in highway reconstruction and expansion. By setting an extension rod, when the first brake block presses against the surface of the steel beam, since the bottom surface of the second brake block is at the same height as the bottom surface of the first brake block, the extension rod drives the second brake block to press against the surface of the steel beam simultaneously, thereby increasing the position of the steel beam that is restricted by friction and improving the braking efficiency of the steel beam. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure on the extension rod of the present invention;

[0023] Figure 3 This is a schematic diagram of the second braking block of the present invention;

[0024] Figure 4 This is a schematic diagram of the suction cup of the present invention;

[0025] Figure 5 This is the invention Figure 2 Enlarged diagram of part A in the middle;

[0026] Figure 6 This is a side view of the push rod of the present invention;

[0027] Figure 7 This is a schematic diagram showing the connection between the second link and the first link of the present invention;

[0028] Figure 8 This is the invention Figure 7 Enlarged diagram of section B;

[0029] Figure 9 This is a schematic diagram of the top of the second connecting rod of the present invention;

[0030] Figure 10 This is a schematic diagram of the embedded block connection structure of the present invention.

[0031] In the diagram: 1. Lifting frame; 11. First lifting rope; 12. Transition piece; 13. Transition plate; 14. Second lifting rope; 2. Connecting frame; 21. Support plate; 22. First hydraulic cylinder; 23. Top rod; 231. First connecting rod; 232. Second connecting rod; 233. Third connecting rod; 24. First brake block; 3. Second hydraulic cylinder; 31. Linkage rod; 32. Extension rod; 33. Second brake block; 34. Suction cup; 35. Air pump; 4. Receiving block; 41. Receiving groove; 42. Restriction spring; 43. Linkage plate; 44. Connecting rod; 5. Support spring; 6. Slot; 61. Locking block; 62. Embedding block; 63. Buffer spring; 64. Pressure plate. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0033] like Figures 1 to 2 As shown in the figure, a splicing structure for new and old bridges in highway reconstruction and expansion according to an embodiment of the present invention includes a lifting frame 1. A first lifting rope 11 is provided at the top of the lifting frame 1. A transition piece 12 is provided at the bottom end of the first lifting rope 11. A transition plate 13 is provided at the bottom end of the transition piece 12. A plurality of second lifting ropes 14 are provided on the bottom surface of the transition plate 13. The bottom ends of the second lifting ropes 14 are used to fix the steel beam.

[0034] A connecting frame 2 is fixed to the top of the lifting frame 1. A support plate 21 is provided on the bottom surface of the connecting frame 2. A pair of first hydraulic cylinders 22 are symmetrically installed on the bottom surface of the support plate 21 based on the center line. The output end of the first hydraulic cylinder 22 extends through to the top of the support plate 21. A connecting rod is provided at the end of the output end of the first hydraulic cylinder 22. A push rod 23 is provided at the end of the connecting rod away from the first hydraulic cylinder 22. The bottom end of the push rod 23 passes through the support plate 21 and the transition plate 13 respectively. A first brake block 24 is provided at the bottom end of the push rod 23.

[0035] In this embodiment of the invention, when splicing new and old steel beams, the new steel beam is fixed by the second lifting rope 14, and then the new steel beam is lifted by the first lifting rope 11 in conjunction with the transition piece 12 and the transition plate 13. The steel beam is then moved to the designated position above the lifting frame 1. When the lifting frame 1 stops moving, the steel beam will sway under the action of inertia. At this time, the first hydraulic cylinder 22 is activated. The output end of the first hydraulic cylinder 22 drives the push rod 23 to move downward. The push rod 23 stops when the first brake block 24 at the bottom of the push rod 23 presses against the surface of the steel beam. When the first brake block 24 presses against the surface of the steel beam, friction is generated between it and the steel beam. The push rod 23 passes through the support plate 21, and the support plate 21 is fixed to the lifting frame 1 by the connecting frame 2. Since the lifting frame 1 remains stationary when it stops moving, the first brake block 24 can limit the swaying of the steel beam through friction, so that the swaying steel beam quickly comes to a stop. After coming to a stop, the steel beam moves downward to the designated position, realizing the rapid splicing of new and old steel beams and improving the splicing efficiency of new and old steel beams.

[0036] like Figures 1 to 5 As shown, an extension rod 32 is provided on the surface of the top rod 23 and below the transition plate 13. A first connecting member is provided between the extension rod 32 and the top rod 23. A second braking block 33 is provided at the bottom end of the extension rod 32. The bottom surface of the second braking block 33 is at the same height as the bottom surface of the first braking block 24. When the first braking block 24 presses against the surface of the steel beam, since the bottom surface of the second braking block 33 is at the same height as the bottom surface of the first braking block 24, the extension rod 32 drives the second braking block 33 to press against the surface of the steel beam simultaneously, increasing the position of the steel beam that is restricted by friction and improving the braking efficiency of the steel beam.

[0037] The top surface of the second brake block 33 has a pair of receiving holes; a suction cup 34 is provided inside the receiving holes, and the opening of the suction cup 34 is located below the receiving holes. Multiple air pumps 35 are installed on the top surface of the extension rod 32. A conduit is provided between the air pump 35 and the suction cup 34. When the second brake block 33 presses against the surface of the steel beam, the air pump 35 is activated. The air pump 35 draws air from the suction cup 34 through the conduit. The opening of the suction cup 34 presses against the surface of the steel beam. When the suction cup 34 is drawn, it will adhere to the surface of the steel beam, thereby improving the braking effect of the second brake block 33 on the steel beam.

[0038] The first connecting component includes a second hydraulic cylinder 3, and a connecting rod 31 is provided between the second hydraulic cylinder 3 and the extension rod 32; the extension rod 32 passes through the top rod 23; when the opening of the suction cup 34 aligns with the mounting hole on the surface of the steel beam, the position of the extension rod 32 is adjusted by the second hydraulic cylinder 3 and the connecting rod 31, and the extension rod 32 drives the second brake block 33 to move, so that the suction cup 34 on the second brake block 33 moves synchronously away from the mounting hole of the steel beam, thus avoiding air leakage when the suction cup 34 is adsorbed onto the surface of the steel beam.

[0039] like Figures 5 to 10As shown, the top rod 23 includes a first connecting rod 231, a second connecting rod 232, and a third connecting rod 233; a second connecting member is provided between the first connecting rod 231 and the second connecting rod 232; a third connecting member is provided between the second connecting rod 232 and the third connecting rod 233; the second connecting member includes a support spring 5, and multiple support springs 5 ​​are provided, with the top end installed at the bottom end of the first connecting rod 231 and the bottom end installed at the top end of the second connecting rod 232; the multiple support springs 5 ​​are arranged in a ring between the first connecting rod 231 and the second connecting rod 232; when the uppermost surface of the steel beam tilts, the top rod 23 drives the first brake block 24 to press against the uppermost surface of the steel beam, and the first brake block 24 drives the second connecting rod 232 and the third connecting rod 233 to tilt relative to the first connecting rod 231, and the support spring 5 between the first connecting rod 231 and the second connecting rod 232 deforms. As the top rod 23 moves further downward, the bottom surface of the first brake block 24 can fully contact the surface of the steel beam to ensure the braking effect.

[0040] The top end of the second connecting rod 232 is provided with a slot 6, and the bottom end of the first connecting rod 231 is provided with a block 61. The diameter of the block 61 is smaller than the inner diameter of the slot 6. When the support spring 5 is compressed, since the diameter of the block 61 is smaller than the inner diameter of the slot 6, the block 61 can be inserted into the slot 6 when the first brake block 24 causes the second connecting rod 232 and the third connecting rod 233 to tilt relative to the first connecting rod 231. Then, as the tilt deepens, the end of the block 61 presses against the inner wall of the slot 6 to limit the tilt angle, thus avoiding excessive tilting that would affect the use of the push rod 23.

[0041] The annular inner wall of the slot 6 is evenly provided with multiple embedding slots, and an embedding block 62 is inserted into the embedding slot. A buffer spring 63 is provided between the embedding block 62 and the inner wall of the embedding slot. The top surface of the embedding block 62 located outside the embedding slot is set as an inclined surface. Multiple pressure plates 64 are arranged in annular shape on the side of the card block 61. When the card block 61 is vertically inserted into the slot 6, the end of the embedding block 62 away from the embedding slot and the end of the pressure plate 64 away from the card block 61 do not have compressive contact. During the process of the bottom end of the card block 61 being inserted into the slot 6, the card block 61 is inclined relative to the first connecting rod 231. Therefore, when the card block 61 is inserted into the slot 6, the pressure plate 64 on the side will press against the inclined surface of the top of the embedding block 62. When the inclined surface is compressed, it retracts into the embedding slot. Afterwards, when the pressure plate 64 moves below the embedding block 62, the embedding block 62 is compressed by the action of the buffer spring 63. When the lower reset movement occurs, the pressure plate 64 is engaged by the embedded block 62, achieving the engagement effect between the locking block 61 and the slot 6. Consequently, when the locking block 61 tilts inside the slot 6, the side pressure plate 64 is blocked by the embedded block 62. That is, when the bottom end of the locking block 61 presses against the inner wall of the slot 6, the pressure plate 64 simultaneously presses against the bottom surface of the embedded block 62, strengthening the engagement effect of the locking block 61 with the slot 6 and preventing the bottom end of the locking block 61 from being excessively compressed and deformed. The engagement effect of the deformed locking block 61 is reduced. Therefore, setting the embedded block 62 and the pressure plate 64 can optimize the engagement effect between the locking block 61 and the slot 6. Furthermore, when the first connecting rod 231 returns to its initial position with the second connecting rod 232, since the end of the embedded block 62 away from the slot and the end of the pressure plate 64 away from the locking block 61 do not have compressive contact when the locking block 61 is vertically inserted into the slot 6, the movement of the pressure plate 64 is not blocked by the embedded block 62.

[0042] The third connecting component includes a receiving block 4, with a receiving groove 41 on its top surface. The bottom end of the second connecting rod 232 is inserted into the receiving groove 41 on the top surface of the receiving block 4 and contacts the bottom wall of the receiving groove 41. The top end of the third connecting rod 233 is fixedly connected to the bottom surface of the receiving block 4. Multiple limiting springs 42 are provided between the second connecting rod 232 located in the receiving groove 41 and the inner wall of the receiving groove 41. The limiting springs 42 are evenly distributed in a ring within the receiving groove 41. When the first braking block 24 presses against the surface of the steel beam, the swaying of the steel beam is restricted. Due to the large mass of the steel beam, the swaying of the steel beam is limited. The impact force generated by the movement is relatively large, so a support block 4 is set. When the impact force generated by the swaying of the steel beam reaches a certain level, the friction between the first brake block 24 and the surface of the steel beam drives the support block 4 at the top of the third link 233 to move relative to the second link 232. When the second link 232 moves, the part located in the support groove 41 squeezes the limiting spring 42. The third link 233 and the second link 232 are interleaved, which avoids the top rod 23 being subjected to excessive interleaved friction force when the steel beam is restricted by the first brake block 24, thus preventing structural damage. In other words, there is a buffer when the steel beam is restricted from swaying.

[0043] The limiting spring 42 is specifically an inflatable air spring; a connecting plate 43 is provided on the side of the third link 233, and a connecting rod 44 is provided on the top surface of the connecting plate 43; the side of the second link 232 is symmetrically provided with the same structure based on the receiving block 4; after repeated use, the limiting spring 42 will undergo plastic deformation, that is, it is difficult to return to its original position after deformation, which causes the center lines of the third link 233 and the second link 232 to intersect. Therefore, the limiting spring 42 is set as an air spring. When adjusting the position of the third link 233 and the second link 232, the air spring is inflated and the docking of the pair of docking rods 44 is observed. When the ends of the pair of docking rods 44 are completely docked, the air spring is inflated. At this time, the center lines of the second link 232 and the third link 233 coincide, thereby realizing the adjustment of the position of the third link 233 and the second link 232, which is convenient for subsequent use.

[0044] The push rod 23, the support plate 21, and the connecting frame 2 are all made of hard alloy steel, which helps to improve the service life of the push rod 23.

[0045] During operation, when splicing new and old steel beams, the new steel beam is fixed by the second lifting rope 14. Then, the new steel beam is lifted by the first lifting rope 11 in conjunction with the transition piece 12 and the transition plate 13. The lifting frame 1 moves the steel beam to a designated position. When the lifting frame 1 stops moving, the steel beam will sway due to inertia. At this time, the first hydraulic cylinder 22 is activated. The output end of the first hydraulic cylinder 22 drives the push rod 23 downward. It stops when the first brake block 24 at the bottom of the push rod 23 presses against the surface of the steel beam. When the first brake block 24 presses against the surface of the steel beam, friction is generated between it and the steel beam. Meanwhile, the push rod 23 passes through the support plate 21. 1. The steel beam is fixed to the lifting frame 1 by the connecting frame 2. Since the lifting frame 1 remains stationary when it stops moving, the first brake block 24 can limit the swaying of the steel beam through friction, so that the swaying steel beam can quickly come to a stop. After the steel beam comes to a stop, it moves down to the designated position, realizing the rapid splicing of the old and new steel beams and improving the splicing efficiency of the old and new steel beams. When the first brake block 24 presses against the surface of the steel beam, since the bottom surface of the second brake block 33 is at the same height as the bottom surface of the first brake block 24, the extension rod 32 drives the second brake block 33 to press against the surface of the steel beam simultaneously, increasing the position of the steel beam that is restricted and braked by friction, and improving the braking efficiency of the steel beam.

[0046] When the second brake block 33 presses against the surface of the steel beam, the vacuum pump 35 is activated. The vacuum pump 35 evacuates air from the suction cup 34 through a conduit. The opening of the suction cup 34 presses against the surface of the steel beam, and the suction cup 34 adheres to the surface of the steel beam when air is drawn in. When the opening of the suction cup 34 aligns with the mounting hole on the surface of the steel beam, the position of the extension rod 32 is adjusted by the second hydraulic cylinder 3 and the connecting rod 31. The extension rod 32 drives the second brake block 33 to move, causing the suction cup 34 on the second brake block 33 to move synchronously away from the mounting hole of the steel beam. When the uppermost surface of the steel beam tilts, the push rod 23 drives the first brake block 24 to press against the uppermost surface of the steel beam. The first brake block 24 causes the second link 232 and the third link 233 to tilt relative to the first link 231, and the support spring 5 between the first link 231 and the second link 232 deforms. As the top rod 23 moves further downward, when the support spring 5 is compressed, since the diameter of the locking block 61 is smaller than the inner diameter of the slot 6, the locking block 61 can be inserted into the slot 6 when the first brake block 24 causes the second link 232 and the third link 233 to tilt relative to the first link 231. Then, as the tilt deepens, the end of the locking block 61 presses against the inner wall of the slot 6, limiting the tilt angle.

[0047] During the process of inserting the bottom end of the locking block 61 into the slot 6, the pressure plate 64 on the side of the locking block 61 presses against the inclined surface of the top of the embedding block 62. When the inclined surface is squeezed, it retracts into the embedding slot. Afterwards, when the pressure plate 64 moves below the embedding block 62, the embedding block 62 is reset and moved by the action of the buffer spring 63. The pressure plate 64 is locked by the embedding block 62, realizing the effect of locking the locking block 61 and the slot 6. And when the first connecting rod 231 returns to the initial position of the second connecting rod 232, due to the locking block 61 When vertically inserted into the slot 6, the end of the insert block 62 furthest from the slot and the end of the pressure plate 64 furthest from the block 61 do not have compressive contact, so the movement of the pressure plate 64 is not blocked by the insert block 62; when the first brake block 24 presses against the surface of the steel beam, the swaying of the steel beam is restricted. Due to the large mass of the steel beam, the impact force generated by the swaying of the steel beam is large, so a support block 4 is set. When the impact force generated by the swaying of the steel beam reaches a certain magnitude, the friction between the first brake block 24 and the surface of the steel beam drives the third link. The receiving block 4 at the top of rod 233 moves relative to the second connecting rod 232. When the second connecting rod 232 moves, the part located in the receiving groove 41 squeezes the limiting spring 42. The third connecting rod 233 and the second connecting rod 232 intersect, preventing the top rod 23 from being subjected to excessive frictional force when the steel beam swayed by the first brake block 24, thus preventing structural damage. That is, there is a buffer when the steel beam sways. However, after repeated use, the limiting spring 42 will undergo plastic deformation, that is, it is difficult to return to its original position after deformation, which causes the third connecting rod to... Since the center lines of the third link 233 and the second link 232 intersect, the limiting spring 42 is set as an air spring. When adjusting the position of the third link 233 and the second link 232, the air spring is inflated and the docking of the pair of docking rods 44 is observed. When the ends of the pair of docking rods 44 are fully docked, the inflation of the air spring is stopped. At this time, the center lines of the second link 232 and the third link 233 coincide, thereby realizing the adjustment of the position of the third link 233 and the second link 232, which is convenient for subsequent use.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A splicing structure for new and old bridges in the reconstruction and expansion of a highway, characterized in that: The system includes a lifting frame (1), with a first lifting rope (11) at the top, a transition piece (12) at the bottom end of the first lifting rope (11), a transition plate (13) at the bottom end of the transition piece (12), and a plurality of second lifting ropes (14) on the bottom surface of the transition plate (13); the bottom ends of the second lifting ropes (14) are used to fix the steel beam. The top of the lifting frame (1) is fixedly connected to a connecting frame (2), and a support plate (21) is provided on the bottom surface of the connecting frame (2). A pair of first hydraulic cylinders (22) are symmetrically installed on the bottom surface of the support plate (21) based on the center line. The output end of the first hydraulic cylinder (22) extends through to the top of the support plate (21). A connecting rod is provided at the end of the output end of the first hydraulic cylinder (22). A push rod (23) is provided at the end of the connecting rod away from the first hydraulic cylinder (22). The bottom end of the push rod (23) passes through the support plate (21) and the transition plate (13) respectively. A first brake block (24) is provided at the bottom end of the push rod (23). The top rod (23) includes a first connecting rod (231), a second connecting rod (232), and a third connecting rod (233); a second connecting member is provided between the first connecting rod (231) and the second connecting rod (232); a third connecting member is provided between the second connecting rod (232) and the third connecting rod (233); the second connecting member includes a support spring (5), and multiple support springs (5) are provided, with the top end installed at the bottom end of the first connecting rod (231) and the bottom end installed at the top end of the second connecting rod (232); multiple support springs (5) are arranged in a ring between the first connecting rod (231) and the second connecting rod (232); The third connector includes a receiving block (4), the top surface of which is provided with a receiving groove (41), the bottom end of the second connecting rod (232) is inserted into the receiving groove (41) on the top surface of the receiving block (4) and contacts the bottom wall of the receiving groove (41); the top end of the third connecting rod (233) is fixed to the bottom surface of the receiving block (4); a plurality of limiting springs (42) are provided between the second connecting rod (232) located in the receiving groove (41) and the inner wall of the receiving groove (41), and the limiting springs (42) are evenly distributed in a ring in the receiving groove (41).

2. The splicing structure for new and old bridges in highway reconstruction and expansion according to claim 1, characterized in that: An extension rod (32) is provided on the surface of the top rod (23) and below the transition plate (13). A first connecting member is provided between the extension rod (32) and the top rod (23). A second brake block (33) is provided at the bottom end of the extension rod (32). The bottom surface of the second brake block (33) is at the same height as the bottom surface of the first brake block (24).

3. The splicing structure for new and old bridges in highway reconstruction and expansion according to claim 2, characterized in that: The top surface of the second brake block (33) is provided with a pair of receiving holes; a suction cup (34) is provided inside the receiving hole, the opening of the suction cup (34) is located below the receiving hole, and multiple air pumps (35) are installed on the top surface of the extension rod (32), and a conduit is provided between the air pump (35) and the suction cup (34).

4. The splicing structure for new and old bridges in highway reconstruction and expansion according to claim 3, characterized in that: The first connecting member includes a second hydraulic cylinder (3), and a connecting rod (31) is provided between the second hydraulic cylinder (3) and the extension rod (32); the extension rod (32) passes through the top rod (23).

5. The splicing structure for new and old bridges in highway reconstruction and expansion according to claim 1, characterized in that: The second connecting rod (232) has a slot (6) at its top end, and the first connecting rod (231) has a block (61) at its bottom end. The diameter of the block (61) is smaller than the inner diameter of the slot (6).

6. The splicing structure for new and old bridges in highway reconstruction and expansion according to claim 5, characterized in that: The inner wall of the slot (6) is evenly provided with multiple embedding slots, and an embedding block (62) is inserted into the inside of the embedding slot. A buffer spring (63) is provided between the embedding block (62) and the inner wall of the embedding slot. The top surface of the embedding block (62) located outside the embedding slot is set as an inclined surface. Multiple pressure plates (64) are arranged in a ring on the side of the card block (61). When the card block (61) is vertically inserted into the slot (6), the end of the embedding block (62) away from the embedding slot and the end of the pressure plate (64) away from the card block (61) do not have extrusion contact.

7. The splicing structure for new and old bridges in highway reconstruction and expansion according to claim 1, characterized in that: The limiting spring (42) is specifically an inflatable air spring; the third link (233) has a connecting plate (43) on its side, and the top surface of the connecting plate (43) has a connecting rod (44); the second link (232) has the same structure symmetrically arranged on its side based on the receiving block (4).

8. The splicing structure for new and old bridges in highway reconstruction and expansion according to claim 1, characterized in that: The top rod (23), the support plate (21), and the connecting frame (2) are all made of hard alloy steel.

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