Connecting rod and bridge

Abstract

The present invention provides a connecting rod and a bridge, comprising a central connecting rod, a front connecting rod connected to the central connecting rod, an inner elastic member sleeved on the central connecting rod, an outer elastic member, a front limit block, a rear limit guide block, a rear limit block, an outer sleeve, a front end cover, a rear end cover, and a rear connecting rod, wherein the outer elastic member sleeves over the inner elastic member, the outer sleeve sleeves over the outer elastic member, the front end cover and the rear end cover are respectively detachably fixedly connected to two sides of the outer sleeve, the rear connecting rod is connected to the rear end cover, the front limit block is used to limit the movement of the inner elastic member toward the side of the central connecting rod closer to the front connecting rod, the rear limit guide block is used to limit the movement of the inner elastic member and the outer elastic member toward the side of the central connecting rod closer to the rear connecting rod, the rear limit block is located on the side of the rear limit guide block closer to the rear connecting rod, the front end cover abuts against the side of the outer elastic member closer to the front connecting rod, and the rear end cover abuts against the side of the rear limit guide block closer to the rear connecting rod. The present invention can achieve automatic reset of the structure after an earthquake.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge vibration reduction, in particular to a connecting rod and a bridge. Background Art

[0002] Earthquakes are sudden and devastating, causing casualties and significant economic losses, undoing construction achievements, and triggering long-term social, political, and economic problems. Bridges are a crucial component of transportation lifeline systems. During earthquake relief efforts, transportation networks are crucial for saving lives and property, resuming production and rebuilding homes, and mitigating secondary disasters. Consequently, extensive research on bridge seismic isolation and mitigation technologies has been conducted both domestically and internationally, and various vibration reduction methods have been implemented.

[0003] Viscous dampers, or velocity lockers, are among the most commonly used bridge seismic isolation technologies. They are based on the principle that the viscous damping force generated when a fluid passes through a small hole in a piston or the gap between the piston and the cylinder is a velocity-dependent energy dissipation device. However, viscous dampers suffer from a short service life, high cost, and extensive maintenance and repair. Furthermore, currently used viscous dampers and velocity lockers lack an automatic reset function, making them difficult to restore and repair bridge structures after a major earthquake. Summary of the Invention

[0004] The object of the present invention is to provide a connecting rod and a bridge to solve the problem that the existing connecting rods and bridges have no automatic reset function, resulting in great difficulty in reset and repair.

[0005] The rear end cover is fixedly mounted on the front end of the center link, and the front end cover is fixedly mounted on the front end of the center link, wherein the front end cover and the rear end cover are respectively detachably connected to the front and rear end covers of the outer sleeve.

[0006] Optionally, the front limit block is detachably fixedly connected to the central connecting rod, and the front limit block abuts against a side of the inner elastic member close to the front connecting rod.

[0007] Optionally, the front limit block is threadedly connected to the center connecting rod, a first pin hole is provided on the outer circumference of the front limit block, a second pin hole connected to the first pin hole is provided on the outer circumference of the center connecting rod, and the connecting rod also has a first limit pin, which is inserted into the first pin hole and the second pin hole.

[0008] Optionally, the rear limit block is detachably fixedly connected to the central connecting rod, and the rear limit guide block is respectively in contact with the inner elastic member and the outer elastic member on one side close to the rear connecting rod.

[0009] Optionally, the rear limit block is threadedly connected to the center connecting rod, a third pin hole is provided on the outer circumference of the rear limit block, a fourth pin hole connected to the third pin hole is provided on the outer circumference of the center connecting rod, and the connecting rod also has a second limit pin, which is inserted into the third pin hole and the fourth pin hole.

[0010] Optionally, it further includes a front limit guide block sleeved on the central connecting rod, and the front limit guide block is located between the front end cover and the outer elastic member.

[0011] Optionally, the front limit block is further used to limit the outer elastic member from moving toward the side of the central link close to the front link.

[0012] Optionally, the front limit block includes an annular body detachably connected to the center link, and a flange extending from the annular body toward the rear link, the annular body abuts against the inner elastic member, and the flange abuts against the outer elastic member.

[0013] The present invention also provides a bridge, comprising a first main beam and a second main beam, piers for supporting the first main beam and the second main beam, and the above-mentioned connecting rod for connecting the first main beam and the second main beam.

[0014] The present invention also provides a bridge, comprising a continuous main beam, piers for supporting the continuous main beam, and the above-mentioned connecting rods arranged on both sides of the piers for connecting the continuous main beam and the piers.

[0015] The connecting rod and bridge provided by the present invention have the following beneficial effects:

[0016] Because both the external and internal elastic members have automatic reset functions, they can automatically reset the structure after a major earthquake, reducing residual deformation and making earthquake damage remediation easier. Furthermore, by arranging the external and internal elastic members on the central connecting rod, and by transmitting pressure to the rear connecting rod through the internal elastic member when the connecting rod is compressed and tension to the rear connecting rod through the external elastic member when the connecting rod is tensile, different elastic members are used to transmit both pressure and tension. This improves the recovery speed of the elastic member during alternating tension and compression, compared to a single elastic member that bears both tension and pressure. This prevents idle travel caused by the elastic member not recovering in time when under compression and continuing to bear the opposing force, ensuring frictional heat dissipation and effectively increasing the width of the hysteresis loop. Furthermore, energy dissipation capacity can be increased by up to two times compared to a single elastic member that bears both tension and pressure. Furthermore, this avoids the oil leakage problem associated with conventional viscous damping, reducing maintenance and repair work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the connecting rod in the original state in the first embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of the connecting rod in a compressed state in the first embodiment of the present invention;

[0019] Figure 3 is a cross-sectional view of the connecting rod in a tensioned state in the first embodiment of the present invention;

[0020] Figure 4 1 is a schematic structural diagram of a central connecting rod in a connecting rod according to a first embodiment of the present invention;

[0021] Figure 5 1 is a schematic structural diagram of the front limit block in the connecting rod in the first embodiment of the present invention;

[0022] Figure 6 1 is a schematic structural diagram of the front limit guide block in the connecting rod in the first embodiment of the present invention;

[0023] Figure 7 1 is a schematic structural diagram of the rear limit guide block in the connecting rod in the first embodiment of the present invention;

[0024] Figure 8 1 is a schematic structural diagram of the rear limit block in the connecting rod in the first embodiment of the present invention;

[0025] Figure 9 1 is a schematic structural diagram of the outer sleeve in the connecting rod in the first embodiment of the present invention;

[0026] Figure 10 1 is a schematic structural diagram of the front end cover in the connecting rod in the first embodiment of the present invention;

[0027] Figure 111 is a schematic structural diagram of the rear end cover in the connecting rod in the first embodiment of the present invention;

[0028] Figure 12 is a cross-sectional view of the connecting rod in the original state in the second embodiment of the present invention;

[0029] Figure 13 is a cross-sectional view of the connecting rod in a compressed state in the second embodiment of the present invention;

[0030] Figure 14 is a cross-sectional view of the connecting rod in a tensioned state in the second embodiment of the present invention;

[0031] Figure 15 1 is a schematic structural diagram of the front limit block in the connecting rod in the second embodiment of the present invention;

[0032] Figure 16 is a structural diagram of a bridge in a third embodiment of the present invention;

[0033] Figure 17 It is a structural diagram of the bridge in the fourth embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 100-connecting rod; 111-center connecting rod; 112-front connecting rod; 113-inner elastic member; 114-outer elastic member; 115-front limit block; 116-annular body; 117-flange; 118-rear limit guide block; 119-rear limit block; 120-outer sleeve; 121-front end cover; 122-rear end cover; 123-rear connecting rod; 124-front limit guide block; 210-first main beam; 220-second main beam; 230-bridge pier; 240-continuous main beam. DETAILED DESCRIPTION

[0036] The following is a detailed description of the connecting rod and bridge proposed by the present invention, with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are highly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0037] Example 1

[0038] refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 , Figure 1is a cross-sectional view of the connecting rod 100 in the original state in the first embodiment of the present invention, Figure 2 is a cross-sectional view of the connecting rod 100 in a compressed state in the first embodiment of the present invention. Figure 3 is a cross-sectional view of the connecting rod 100 in a tensioned state in the first embodiment of the present invention. Figure 4 1 is a structural diagram of the central connecting rod 111 in the connecting rod 100 in the first embodiment of the present invention. Figure 5 1 is a structural diagram of the front limit block 115 in the connecting rod 100 in the first embodiment of the present invention. Figure 6 1 is a schematic structural diagram of the front limiting guide block 124 in the connecting rod 100 in the first embodiment of the present invention. Figure 7 1 is a structural diagram of the rear limit guide block 118 in the connecting rod 100 in the first embodiment of the present invention. Figure 8 1 is a structural diagram of the rear limit block 119 in the connecting rod 100 in the first embodiment of the present invention. Figure 9 1 is a structural diagram of the outer sleeve 120 in the connecting rod 100 in the first embodiment of the present invention. Figure 10 1 is a schematic structural diagram of the front end cover 121 in the connecting rod 100 in the first embodiment of the present invention. Figure 11 11. It is a structural schematic diagram of the rear end cover 122 in the connecting rod 100 in the first embodiment of the present invention. This embodiment provides a connecting rod 100, including a central connecting rod 111, a front connecting rod 112 connected to the central connecting rod 111, an inner elastic member 113, an outer elastic member 114, a front limit block 115, a rear limit guide block 118, a rear limit block 119, an outer sleeve 120, a front end cover 121 and a rear end cover 122, and a rear connecting rod 123, wherein the outer elastic member 114 is sleeved on the inner elastic member 113, the outer sleeve 120 is sleeved on the outer elastic member 114, the front end cover 121 and the rear end cover 122 are respectively sleeved on both sides of the outer sleeve 120. Disassemble the fixed connection, the rear link 123 is connected to the rear end cover 122, the front limit block 115 is used to limit the movement of the inner elastic member 113 toward the side of the center link 111 close to the front link 112, the rear limit guide block 118 is used to limit the movement of the inner elastic member 113 and the outer elastic member 114 toward the side of the center link 111 close to the rear link 123, the rear limit block 119 is located on the side of the rear limit guide block 118 close to the rear link 123, the front end cover 121 abuts against the side of the outer elastic member 114 close to the front link 112, and the rear end cover 122 abuts against the side of the rear limit guide block 118 close to the rear link 123.

[0039] refer to Figure 2When the front link 112 and the rear link 123 are close to each other, that is, when the connecting rod 100 is compressed, since the front link 112 is connected to the center link 111, the outer sleeve 120 is provided on the center link 111, the front end cover 121 and the rear end cover 122 are fixedly connected to the two sides of the outer sleeve 120, and the rear link 123 is connected to the rear end cover 122, the center link 111 can be moved relative to the outer sleeve 120, the front end cover 121 and the rear end cover 122, so that the center link 111 can be moved relative to the outer sleeve 120, the front end cover 121 and the rear end cover 122. The free end (the end connected to the front link 112) moves toward the direction close to the rear link 123; since the rear end cover 122 abuts against the side of the rear limit guide block 118 close to the rear link 123, the rear limit guide block 118 moves relative to the center link 111 toward the direction close to the front link 112; since the rear limit guide block 118 is used to limit the movement of the inner elastic member 113 and the outer elastic member 114 toward the side of the center link 111 close to the rear link 123, the rear limit guide block 118 pushes The inner elastic member 113 moves toward the direction close to the front link 112; since the front limit block 115 is used to limit the movement of the inner elastic member 113 toward the side of the center link 111 close to the front link 112, the inner elastic member 113 is limited by the front limit block 115 and is pushed by the rear limit guide block 118, so that the pressure is transmitted along the direction of the front link 112, the center link 111, the front limit block 115, the inner elastic member 113, the rear limit guide block 118, the rear end cover 122, and the rear link 123; due to the The front end cover 121 abuts against the side of the outer elastic member 114 close to the front connecting rod 112, and the rear limit guide block 118 is used to limit the movement of the inner elastic member 113 and the outer elastic member 114 toward the side of the center connecting rod 111 close to the rear connecting rod 123, and the rear limit guide block 118 does not move relative to the rear end cover 122, so the outer elastic member 114 located between the front end cover 121 and the rear limit guide block 118 is not affected by external force, so the outer elastic member 114 does not participate in the transmission of pressure when the connecting rod 100 is under pressure.

[0040] refer to Figure 3, when the front link 112 and the rear link 123 move away from each other, that is, when the connecting rod 100 is pulled, since the front link 112 is connected to the center link 111, the outer sleeve 120 is provided on the center link 111, the front end cover 121 and the rear end cover 122 are fixedly connected to the two sides of the outer sleeve 120, respectively, and the rear link 123 is connected to the rear end cover 122, so that the center link 111 can be moved relative to the outer sleeve 120, the front end cover 121 and the rear end cover 122, so that the free end of the center link 111 (located at the end connected to the front link 112) moves toward the direction close to the front link 112; Since the rear limit block 119 is located on the side of the rear limit guide block 118 close to the rear link 123, the rear limit block 119 can limit the movement of the rear limit guide block 118 toward the side close to the rear link 123; since the rear limit guide block 118 is used to limit the movement of the inner elastic member 113 and the outer elastic member 114 toward the side of the center link 111 close to the rear link 123, the outer elastic member 114 can be pushed by the rear limit block 119 and the rear limit guide block 118 to move toward the direction close to the front link 112; since the front end cover 121 and the rear end cover 122 are respectively fixed to the two sides of the outer sleeve 120 The rear connecting rod 123 is connected to the rear end cover 122, so the positions of the outer sleeve 120, the front end cover 121 and the rear end cover 122 remain relatively unchanged. Since the front end cover 121 abuts against the side of the outer elastic member 114 close to the front connecting rod 112, the outer elastic member 114 is compressed under the action of the rear limit block 119, the rear limit guide block 118 and the front end cover 121; so that the pressure is transmitted along the direction of the front connecting rod 112, the center connecting rod 111, the rear limit block 119, the rear limit guide block 118, the outer elastic member 114, the front end cover 121, the outer sleeve 120, the rear end cover 122 and the rear connecting rod 123; The rear limit block 119 and the rear limit guide block 118 do not move relative to the center link 111. The front limit block 115 is used to limit the movement of the inner elastic member 113 toward the side of the center link 111 close to the front link 112. The rear limit guide block 118 is used to limit the movement of the inner elastic member 113 and the outer elastic member 114 toward the side of the center link 111 close to the rear link 123. The rear limit block 119 is located on the side of the rear limit guide block 118 close to the rear link 123. Therefore, the inner elastic member 113 is not affected by external force. Therefore, the inner elastic member 113 does not participate in the transmission of tension when the connecting rod 100 is pulled.

[0041] In this embodiment, since both the outer elastic member 114 and the inner elastic member 113 have an automatic reset function, they can achieve automatic reset of the structure after an earthquake, reducing residual deformation and making earthquake damage remediation easier. Furthermore, by arranging the outer elastic member 114 and the inner elastic member 113 on the central link 111, and by transmitting pressure to the rear link 123 via the inner elastic member 113 when the connecting rod 100 is under compression, and transmitting tension to the rear link 123 via the outer elastic member 114 when the connecting rod 100 is under tension, different elastic members are used to transmit both pressure and tension. Compared to a single elastic member that bears both tension and pressure, this improves the elastic member's recovery speed during alternating tension and compression, avoiding idle travel caused by the elastic member failing to recover in time when under compression and continuing to bear the opposing force. This ensures frictional heat dissipation, effectively increases the width of the hysteresis loop, and increases energy dissipation capacity by up to two times compared to a single elastic member that bears both tension and pressure. Furthermore, this avoids the oil leakage problem associated with conventional viscous damping, reducing maintenance and repair work.

[0042] refer to Figure 1 The front limit block 115 is detachably fixedly connected to the central connecting rod 111 , and the front limit block 115 abuts against a side of the inner elastic member 113 close to the front connecting rod 112 .

[0043] The front stopper 115 is threadedly connected to the center link 111. A first pin hole is defined on the outer circumference of the front stopper 115, and a second pin hole is defined on the outer circumference of the center link 111, communicating with the first pin hole. The connecting rod 100 also includes a first stopper pin, which is inserted into both the first and second pin holes. This prevents the front stopper 115 from loosening its connection to the center link 111.

[0044] refer to Figure 1 The rear limit block 119 is detachably fixedly connected to the central connecting rod 111, and the rear limit guide block 118 is respectively in contact with the inner elastic member 113 and the outer elastic member 114 on one side close to the rear connecting rod 123.

[0045] The rear stopper 119 is threadedly connected to the center link 111. A third pin hole is defined on the outer circumference of the rear stopper 119, and a fourth pin hole is defined on the outer circumference of the center link 111, communicating with the third pin hole. The connecting rod 100 also includes a second stopper pin, which is inserted into the third and fourth pin holes. This prevents the connection between the rear stopper 119 and the center link 111 from loosening.

[0046] The rear limiting guide block 118 is preferably slidably connected to the inner wall of the outer sleeve 120 .

[0047] The front connecting rod 112 is threadedly connected to the central connecting rod 111. The front connecting rod 112 is provided with a first through hole for hinged connection with other components, and the rear connecting rod 123 is provided with a second through hole for hinged connection with other components.

[0048] The rear connecting rod 123 is threadedly connected to the rear end cover 122 .

[0049] refer to Figure 1 、 Figure 2 and Figure 3 The connecting rod 100 further includes a front limit guide block 124 mounted on the center link 111 and positioned between the front end cover 121 and the outer elastic member 114. When the outer elastic member 114 is compressed, the front limit guide block 124 is configured to restrict movement of the outer elastic member 114 toward the front link 112, thereby compressing the outer elastic member 114 between the front limit guide block 124 and the rear limit guide block 118. The provision of the front limit guide block 124 facilitates force transmission and evenly distributes force to the outer elastic member 114, thereby improving the stability of the connecting rod.

[0050] The front limiting guide block 124 is preferably slidably connected to the inner wall of the outer sleeve 120. For example, a keyway is provided on the inner wall of the outer sleeve 120, and a guide key that slides with the keyway is provided on the outer peripheral surface of the front limiting guide block 124.

[0051] The outer elastic member 114 and the outer elastic member 114 can be an annular spring. The annular spring has the characteristics of high rigidity, high strength, convenient adjustment, small installation space, strong buffering and shock absorption ability, and a certain energy dissipation function.

[0052] Example 2

[0053] refer to Figure 12 、 Figure 13 、 Figure 14 and Figure 15 , Figure 12 is a cross-sectional view of the connecting rod 100 in the original state in the second embodiment of the present invention, Figure 13 is a cross-sectional view of the connecting rod 100 in a compressed state in the second embodiment of the present invention. Figure 14 is a cross-sectional view of the connecting rod 100 in a tensioned state in the second embodiment of the present invention. Figure 15 1 is a schematic structural diagram of a front stopper 115 in a connecting rod 100 according to a second embodiment of the present invention. This embodiment provides a connecting rod 100. The connecting rod 100 in this embodiment differs from the connecting rod 100 in the first embodiment in that the front stopper 115 in this embodiment is not used as the front stopper 115 in the first embodiment.

[0054] Specifically, the front limit block 115 is used to limit the inner elastic member 113 and the outer elastic member 114 from moving toward the side of the central link 111 close to the front link 112 .

[0055] refer to Figure 13 When the front link 112 and the rear link 123 are close to each other, that is, when the connecting rod 100 is compressed, since the front link 112 is connected to the center link 111, the outer sleeve 120 is provided on the center link 111, the front end cover 121 and the rear end cover 122 are fixedly connected to both sides of the outer sleeve 120, and the rear link 123 is connected to the rear end cover 122, so that the center link 111 can be relatively close to the outer sleeve 120, the front end cover 121 and the The rear end cover 122 moves, so that the free end of the central link 111 (located at the end connected to the front link 112) moves toward the direction close to the rear link 123; since the rear end cover 122 abuts against the side of the rear limit guide block 118 close to the rear link 123, the rear limit guide block 118 moves relative to the central link 111 toward the direction close to the front link 112; since the rear limit guide block 118 is used to limit the inner elastic member 113 and the outer elastic member 114 from moving toward the The center link 111 moves closer to the side of the rear link 123, so the rear limit guide block 118 pushes the inner elastic member 113 to move closer to the front link 112; since the front limit block 115 is used to limit the inner elastic member 113 and the outer elastic member 114 from moving toward the side of the center link 111 closer to the front link 112, the inner elastic member 113 and the outer elastic member 114 are limited by the front limit block 115 and the rear limit guide block 118. , so that the pressure is transmitted along the direction of the front connecting rod 112, the center connecting rod 111, the front limit block 115, the inner elastic part 113, the rear limit guide block 118, the rear end cover 122, and the rear connecting rod 123, or along the direction of the front connecting rod 112, the center connecting rod 111, the front limit block 115, the outer elastic part 114, the rear limit guide block 118, the rear end cover 122, and the rear connecting rod 123. Therefore, the outer elastic part 114 and the inner elastic part 113 both participate in the transmission of pressure when the connecting rod 100 is under pressure.

[0056] refer to Figure 14When the front link 112 and the rear link 123 move away from each other, that is, when the connecting rod 100 is pulled, the force transmission condition of the connecting rod 100 is the same as the force transmission condition of the connecting rod 100 in the first embodiment, that is, the outer elastic member 114 is compressed under the action of the rear limit block 119, the rear limit guide block 118 and the front end cover 121, so that the pressure is transmitted along the direction of the front link 112, the center link 111, the rear limit block 119, the rear limit guide block 118, the outer elastic member 114, the front end cover 121, the outer sleeve 120, the rear end cover 122 and the rear link 123. At the same time, since the rear limit block 119 and the rear limit guide block 118 do not move relative to the center link 111, the front limit block 115 is used to limit the movement of the inner elastic member 113 toward the side of the center link 111 close to the front link 112, and the rear limit guide block 118 is used to limit the movement of the inner elastic member 113 and the outer elastic member 114 toward the side of the center link 111 close to the rear link 123. The rear limit block 119 is located on the side of the rear limit guide block 118 close to the rear link 123. Therefore, the inner elastic member 113 is not affected by external force, and therefore the inner elastic member 113 does not participate in the transmission of tension when the connecting rod 100 is pulled.

[0057] In this embodiment, since both the outer elastic part 114 and the inner elastic part 113 participate in the transmission of pressure when the connecting rod 100 is compressed, and only the outer elastic part 114 participates in the transmission of pressure when the connecting rod 100 is pulled, and the inner elastic part 113 does not participate in the transmission of pressure, the stiffness of the connecting rod 100 when it is compressed is greater than the stiffness when it is pulled by hand. It can be used for bridges with high collision requirements under earthquakes, such as the connection between bridges and abutments. The concrete abutments have limited tensile capacity but strong compressive capacity, and can prevent collision damage between bridges and abutments under earthquakes.

[0058] refer to Figure 12 、 Figure 13 、 Figure 14 and Figure 15 The front limit block 115 includes an annular body 116 detachably connected to the central link 111, and a flange 117 extending from the annular body 116 toward the rear link 123. The annular body 116 abuts against the inner elastic member 113, and the flange 117 abuts against the outer elastic member 114.

[0059] Example 3:

[0060] refer to Figure 16 , Figure 16It is a structural schematic diagram of the bridge in Example 3 of the present invention. This embodiment provides a bridge, including a first main beam 210 and a second main beam 220, a pier 230 for supporting the first main beam 210 and the second main beam 220, and a connecting rod 100 in the above embodiment for connecting the first main beam 210 and the second main beam 220.

[0061] Example 4:

[0062] refer to Figure 17 , Figure 17 It is a structural schematic diagram of the bridge in Example 4 of the present invention. This embodiment provides a bridge, including a continuous main beam 240, a pier 230 for supporting the continuous main beam 240, and a connecting rod 100 in the above embodiment arranged on both sides of the pier 230 for connecting the continuous main beam 240 and the pier 230.

[0063] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A connecting rod, characterized in that: The rear end cover is located on a side of the rear limit guide block close to the rear link, the front end cover abuts against the side of the outer elastic member close to the front link, and the rear end cover abuts against the side of the rear limit guide block close to the rear link; When the connecting rod is under pressure, the front limit block limits the inner elastic member from moving toward the side of the central connecting rod close to the front connecting rod, the rear limit guide block abuts against the rear end cover, the inner elastic member is compressed, and the outer elastic member does not participate in the transmission of pressure; When the connecting rod is pulled, the rear limit guide block limits the inner elastic part and the outer elastic part from moving toward the side of the central connecting rod close to the rear connecting rod, the front limit block abuts against the front end cover, the outer elastic part is compressed, and the inner elastic part does not participate in the transmission of pressure.

2. The connecting rod according to claim 1, wherein: The front limit block is detachably fixedly connected to the central connecting rod, and the front limit block abuts against a side of the inner elastic member close to the front connecting rod.

3. The connecting rod according to claim 2, wherein: The front limit block is threadedly connected to the center connecting rod, and a first pin hole is provided on the outer circumference of the front limit block. A second pin hole connected to the first pin hole is provided on the outer circumference of the center connecting rod. The connecting rod also has a first limit pin, which is inserted into the first pin hole and the second pin hole.

4. The connecting rod according to claim 1, wherein: The rear limiting block is detachably fixedly connected to the central connecting rod, and the rear limiting guide block is respectively in contact with one side of the inner elastic member and the outer elastic member close to the rear connecting rod.

5. The connecting rod according to claim 4, characterized in that The rear limit block is threadedly connected to the center connecting rod, and a third pin hole is provided on the outer circumference of the rear limit block. A fourth pin hole connected to the third pin hole is provided on the outer circumference of the center connecting rod. The connecting rod also has a second limit pin, which is inserted into the third pin hole and the fourth pin hole.

6. The connecting rod according to claim 1, wherein: It also includes a front limit guide block sleeved on the central connecting rod, and the front limit guide block is located between the front end cover and the outer elastic member.

7. The connecting rod according to claim 1, wherein: The front limit block is also used to limit the outer elastic member from moving toward the side of the central link close to the front link.

8. The connecting rod according to claim 7, wherein: The front limit block includes an annular body detachably connected to the central link, and a flange extending from the annular body toward the rear link, the annular body abuts against the inner elastic member, and the flange abuts against the outer elastic member.

9. A bridge, characterized in that: The bridge comprises a first main beam and a second main beam, a pier for supporting the first main beam and the second main beam, and a connecting rod according to any one of claims 1 to 8 for connecting the first main beam and the second main beam.

10. A bridge, characterized in that: It comprises a continuous main beam, a pier for supporting the continuous main beam, and a connecting rod according to any one of claims 1 to 8, which is arranged on both sides of the pier and is used to connect the continuous main beam and the pier.

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