Bridge cable expansion device

Abstract

The utility model discloses a bridge cable expansion device which comprises a bearing support, a base, a first base, a second base, a first multi-degree-of-freedom swing rod and a second multi-degree-of-freedom swing rod. The first multi-degree-of-freedom swing rod and the second multi-degree-of-freedom swing rod each comprise a middle connecting rod, a lower ball pin piece connected with the middle connecting rod and an upper hinge piece connected with the middle connecting rod, the two lower ball pin pieces are in ball hinge joint with the first base and the second base in a matched mode, and the two upper hinge pieces are in shaft hinge joint with the base in a matched mode. The bearing support comprises a door-shaped support arranged on the base, a first clamping wheel, a second clamping wheel and a third clamping wheel, wherein the first clamping wheel, the second clamping wheel and the third clamping wheel are sequentially arranged from bottom to top. The bridge cable expansion device is simple in structure, can adapt to expansion in the horizontal direction and can adapt to longitudinal deviation of a bridge through the arrangement of the first multi-degree-of-freedom swing rod and the second multi-degree-of-freedom swing rod, so that the expansion device can meet multi-direction continuous flexible compensation to meet the requirements of bridge cables.

Description

Technical Field

[0001] This utility model belongs to the technical field of bridge cable devices, and in particular relates to a bridge cable expansion joint device. Background Technology

[0002] Changes in climate, bridge load, and other factors can cause high-frequency, large-scale expansion and contraction of bridge expansion joints, leading to frequent elongation and compression of cables laid in that section. This can result in cable damage or even breakage, which is the biggest technical challenge in laying high-voltage cables across bridges. Bridges crossing rivers must be equipped with cable expansion compensation devices to eliminate the impact of bridge expansion and contraction on cables.

[0003] During cable operation, in addition to the thermal expansion and contraction of the cable itself, the expansion and contraction of the bridge itself must also be addressed. Due to temperature changes, the bridge itself will experience considerable expansion and contraction. If no measures are taken, when the bridge experiences significant contraction, the cable is prone to bending or twisting; when the bridge experiences significant tension, the cable is prone to excessive tension, leading to phenomena such as breakage of the cable's metal sheath and insulation breakdown, thus affecting the safe operation of the cable. Therefore, cable expansion and contraction compensation devices are needed to reduce cable damage caused by bridge tension.

[0004] However, current cable expansion compensation devices, such as those disclosed in patent 202010777224.9, do include a rotating part and an expansion mechanism. The rotating part has a through hole through which it can be hinged to the first or second connecting rod. After assembly, it is fixed in series with a pin, washer, and screw, leaving a rotational clearance. Alternatively, it can be connected to the first or second connecting rod through a bearing connection. However, the rotation of the first and second connecting rods is around the pin in the through hole of the rotating part. This only adapts to the horizontal expansion and contraction of the bridge. In reality, in addition to the horizontal expansion and contraction, the bridge will also experience longitudinal displacement due to combined loads. Therefore, the cable expansion compensation device cannot adapt to the longitudinal displacement of the bridge.

[0005] Therefore, there is an urgent need for a simple and reasonably designed bridge cable expansion joint. By setting a first multi-degree-of-freedom pendulum and a second multi-degree-of-freedom pendulum, it can not only adapt to horizontal expansion and contraction, but also adapt to longitudinal offset of the bridge, so that the expansion joint can meet the needs of bridge cables with continuous and flexible compensation in multiple directions. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a bridge cable expansion joint in view of the shortcomings of the prior art. The expansion joint has a simple structure. By setting a first multi-degree-of-freedom swing arm and a second multi-degree-of-freedom swing arm, it can not only adapt to the expansion and contraction in the horizontal direction, but also adapt to the longitudinal offset of the bridge, so that the expansion joint can meet the needs of bridge cables with continuous and flexible compensation in multiple directions.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a bridge cable expansion joint device, characterized in that: it includes a bearing bracket for clamping and passing through the bridge cable, a base set at the bottom of the bearing bracket, a first base set on one side of the bridge expansion joint, a second base set on the other side of the bridge expansion joint, a first multi-degree-of-freedom swing rod connecting the base and the first base, and a second multi-degree-of-freedom swing rod connecting the base and the second base.

[0008] Both the first and second multi-degree-of-freedom swing arm include an intermediate connecting rod, a lower ball pin connected to the intermediate connecting rod, and an upper hinge connected to the intermediate connecting rod. The two lower ball pins and the first base are ball-hinged with the second base, and the two upper hinges are hinged with the base shaft.

[0009] The support bracket includes a portal frame mounted on a base and a first clamping wheel, a second clamping wheel, and a third clamping wheel arranged sequentially from bottom to top within the portal frame. The first clamping wheel is fixed within the portal frame. The portal frame is provided with a first adjustment mechanism for adjusting the second clamping wheel to move closer to or further away from the first clamping wheel and a second adjustment mechanism for adjusting the third clamping wheel to move closer to or further away from the second clamping wheel.

[0010] In the aforementioned bridge cable expansion joint, the first base and the second base each include a mounting plate, a vertical rod disposed on the mounting plate, a carrier plate sleeved on the vertical rod, a bearing spring sleeved on the vertical rod, and a locking nut locked on the vertical rod. The bearing spring is located between the mounting plate and the carrier plate, with the lower end of the bearing spring abutting against the top surface of the mounting plate and the upper end of the bearing spring abutting against the bottom surface of the carrier plate.

[0011] In the aforementioned bridge cable expansion joint, the lower ball pin includes a lower connecting rod with one end detachably inserted into the lower end of the intermediate connecting rod and a lower ball head integrally formed with the lower connecting rod. The carrier plate is provided with a lower ball seat for ball hinge connection of the lower ball head. The lower ball seat is provided with a lower ball seat cover plate for limiting the lower ball head. The lower ball seat cover plate is provided with a lower through hole for the lower ball head to pass through.

[0012] The upper hinge includes an upper connecting rod with one end detachably inserted into the upper end of the intermediate connecting rod, and an upper collar connected to the upper connecting rod. The bottom of the base is provided with a hinge shaft for fitting two upper collars together.

[0013] In the aforementioned bridge cable expansion joint, a lower channel is formed between the first clamping wheel and the second clamping wheel for the lower bridge cable to be clamped and passed through, and an upper channel is formed between the second clamping wheel and the third clamping wheel for the upper bridge cable to be clamped and passed through.

[0014] A first intermediate shaft is inserted through the first clamping wheel, and both ends of the first intermediate shaft are disposed inside the portal bracket.

[0015] The second clamping wheel is provided with a second intermediate shaft, and the third clamping wheel is provided with a third intermediate shaft. The first clamping wheel, the second clamping wheel, and the third clamping wheel can rotate around the first intermediate shaft, the second intermediate shaft, and the third intermediate shaft, respectively.

[0016] In the aforementioned bridge cable expansion joint, a left connecting block and a right connecting block are provided at both the left and right ends of the second intermediate shaft and the third intermediate shaft.

[0017] The first adjustment mechanism includes a first adjustment screw and a first screwing part disposed on the top of the first adjustment screw extending out of the top of the portal bracket. When the first adjustment screw passes through the left connecting block of the third intermediate shaft, it is in clearance engagement; when the first adjustment screw passes through the left connecting block of the second intermediate shaft, it is in thread engagement.

[0018] The second adjustment mechanism includes a second adjustment screw and a second screwing part disposed on the top of the portal frame through which the second adjustment screw passes. The second adjustment screw is threadedly connected when it passes through the right connecting block of the third intermediate shaft, and is clearance-fitted when it passes through the right connecting block of the second intermediate shaft.

[0019] In the aforementioned bridge cable expansion joint, the portal frame includes two columns and a horizontal plate connected to the top of the two columns. An extension plate connected to the base is provided at the bottom of the columns, and the length direction of the horizontal plate is perpendicular to the extension direction of the bridge cable.

[0020] The first adjusting screw and the second adjusting screw are arranged along the height direction of the column and pass through the horizontal plate at the top. The column is provided with a first lower seat bearing and a second lower seat bearing for the bottom ends of the first adjusting screw and the second adjusting screw to be rotatably mounted. The horizontal plate is provided with an internal bearing for the upper part of the first adjusting screw and the second adjusting screw to be rotatably mounted.

[0021] In the aforementioned bridge cable expansion joint, the column is further provided with a sliding groove for the left and right connecting blocks to slide in, and a locking bolt is provided in the left and right connecting blocks so that after the second and third intermediate shafts are adjusted to the correct position, the locking bolt is tightened to make tight contact with the column, thereby locking the second and third intermediate shafts.

[0022] This utility model has the following advantages compared with the prior art:

[0023] 1. This utility model is provided with a first adjustment mechanism and a second adjustment mechanism. The first adjustment mechanism pushes the second clamping wheel to move, thereby adjusting the lower channel distance between the second clamping wheel and the first clamping wheel; the second adjustment mechanism pushes the third clamping wheel to move, thereby adjusting the upper channel distance between the third clamping wheel and the second clamping wheel, until the upper and lower channels meet the diameter requirements of the bridge cable. This improves the convenience of adjustment and adapts to bridge cables of different diameters, thus having great adaptability.

[0024] 2. This utility model is equipped with a portal-shaped bracket to realize the installation of the first clamping wheel, the second clamping wheel and the third clamping wheel, and facilitates the integrated installation of the first adjustment mechanism and the second adjustment mechanism. The whole is compact and adaptable to the requirements of cable passing through and clamping on the upper and lower bridges.

[0025] 3. In this utility model, the intermediate connecting rod of the first multi-degree-of-freedom swing rod and the second multi-degree-of-freedom swing rod is connected to the first base and the second base through the lower ball pin to realize ball hinge. The bottom ball hinge is relative to the previous bottom axle pin hinge, which can rotate in multiple degrees of freedom, thereby adapting to the expansion and contraction of bridge cables under the composite load scenario of bridge expansion joint.

[0026] In summary, this utility model has a simple structure. By setting a first multi-degree-of-freedom swing arm and a second multi-degree-of-freedom swing arm, it can not only adapt to horizontal expansion and contraction, but also adapt to longitudinal offset of the bridge, so that the expansion device can meet the needs of bridge cables with continuous and flexible compensation in multiple directions.

[0027] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0028] Fig. 1 This is a schematic diagram of the structure of this utility model.

[0029] Fig. 2 This is a schematic diagram of the structure of the first and second multi-degree-of-freedom pendulum rods of this utility model.

[0030] Fig. 3 This is a structural schematic diagram of the support bracket of this utility model.

[0031] Fig. 4 This is a schematic diagram of the structure of the column of the portal frame of this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1—Base; 1-1—Hinge shaft;

[0034] 2—First multi-degree-of-freedom pendulum rod; 2-1—Intermediate connecting rod;

[0035] 2-2—Lower ball head; 2-3—Upper collar; 2-4—Lower connecting rod;

[0036] 2-5—Upper connecting rod; 3—Second multi-degree-of-freedom pendulum rod; 4—First base;

[0037] 4-1—Lower ball seat; 4-2—Lower ball seat cover plate; 4-3—Carrier plate;

[0038] 4-4—Mounting plate; 4-5—Vertical rod; 4-6—Load-bearing spring;

[0039] 4-7—Locking nut; 5—Second base; 6—End bracket;

[0040] 7—Bridge expansion joint; 8—Bridge cable; 9—Gantry support;

[0041] 9-1—First intermediate axis; 9-2—Second intermediate axis; 9-3—Third intermediate axis;

[0042] 9-4—First clamping wheel; 9-5—Second clamping wheel; 9-6—Third clamping wheel;

[0043] 9-7—Extension board; 9-8—Upright post; 9-9—Horizontal board;

[0044] 10—First adjusting mechanism; 10-1—First adjusting screw;

[0045] 10-2—First lower bearing with mounting bracket; 10-3—First screwing part; 11—Second adjusting mechanism;

[0046] 11-1—Second adjusting screw; 11-2—Second lower bearing with seat; 11-3—Second tightening part;

[0047] 12—Left connecting block; 13—Right connecting block; 14—Locking bolt;

[0048] 15—Slide groove. Detailed Implementation

[0049] like Figs. 1 to 4 As shown, this utility model includes a support bracket for clamping and threading bridge cables 8, a base 1 set at the bottom of the support bracket, a first base 4 set on one side of the bridge expansion joint 7, a second base 5 set on the other side of the bridge expansion joint 7, a first multi-degree-of-freedom swing rod 2 connecting the base 1 and the first base 4, and a second multi-degree-of-freedom swing rod 3 connecting the base 1 and the second base 5.

[0050] The first multi-degree-of-freedom swing arm 2 and the second multi-degree-of-freedom swing arm 3 both include an intermediate connecting rod 2-1, a lower ball pin connected to the intermediate connecting rod 2-1, and an upper hinge connected to the intermediate connecting rod 2-1. The two lower ball pins and the first base 4 are ball-hinged with the second base 5. The two upper hinges are shaft-hinged with the base 1.

[0051] The support bracket includes a portal frame 9 mounted on a base 1 and a first clamping wheel 9-4, a second clamping wheel 9-5, and a third clamping wheel 9-6 arranged sequentially from bottom to top within the portal frame 9. The first clamping wheel 9-4 is fixed within the portal frame. The portal frame is provided with a first adjustment mechanism 10 for adjusting the second clamping wheel 9-5 to move closer to or further away from the first clamping wheel 9-4, and a second adjustment mechanism 11 for adjusting the third clamping wheel 9-6 to move closer to or further away from the second clamping wheel 9-5.

[0052] In this embodiment, both the first base 4 and the second base 5 include a mounting plate 4-4, a vertical rod 4-5 disposed on the mounting plate 4-4, a carrier plate 4-3 sleeved on the vertical rod 4-5, a bearing spring 4-6 sleeved on the vertical rod 4-5, and a locking nut 4-7 locked on the vertical rod 4-5. The bearing spring 4-6 is located between the mounting plate 4-4 and the carrier plate 4-3. The lower end of the bearing spring 4-6 abuts against the top surface of the mounting plate 4-4, and the upper end of the bearing spring 4-6 abuts against the bottom surface of the carrier plate 4-3.

[0053] In this embodiment, the lower ball pin includes a lower connecting rod 2-4 with one end detachably inserted into the lower end of the intermediate connecting rod 2-1 and a lower ball head 2-2 integrally formed with the lower connecting rod 2-4. The carrier plate 4-3 is provided with a lower ball seat 4-1 for ball hinge connection of the lower ball head 2-2. The lower ball seat 4-1 is provided with a lower ball seat cover plate 4-2 for limiting the lower ball head 2-2. The lower ball seat cover plate 4-2 is provided with a lower through hole for the lower ball head 2-2 to pass through.

[0054] The upper hinge includes an upper connecting rod 2-5 with one end detachably inserted into the upper end of the intermediate connecting rod 2-1, and an upper collar 2-3 connected to the upper connecting rod 2-5. The base 1 has a hinge shaft 1-1 for fitting two upper collars 2-3 inside the bottom.

[0055] In this embodiment, a lower channel is formed between the first clamping wheel 9-4 and the second clamping wheel 9-5 for clamping and passing through the lower bridge cable, and an upper channel is formed between the second clamping wheel 9-5 and the third clamping wheel 9-6 for clamping and passing through the upper bridge cable.

[0056] A first intermediate shaft 9-1 is inserted through the first clamping wheel 9-4, and both ends of the first intermediate shaft 9-1 are disposed inside the portal bracket.

[0057] The second clamping wheel 9-5 is provided with a second intermediate shaft 9-2, and the third clamping wheel 9-5 is provided with a third intermediate shaft 9-3. The first clamping wheel 9-4, the second clamping wheel 9-5, and the third clamping wheel 9-5 can rotate around the first intermediate shaft 9-1, the second intermediate shaft 9-2, and the third intermediate shaft 9-3, respectively.

[0058] In this embodiment, a left connecting block 12 and a right connecting block 13 are provided at both the left and right ends of the second intermediate shaft 9-2 and the third intermediate shaft 9-3;

[0059] The first adjustment mechanism 10 includes a first adjustment screw 10-1 and a first screwing part 10-3 provided on the first adjustment screw 10-1 extending out of the top of the portal bracket. When the first adjustment screw 10-1 passes through the left connecting block 12 of the third intermediate shaft 9-3, it is in clearance engagement. When the first adjustment screw 10-1 passes through the left connecting block 12 of the second intermediate shaft 9-2, it is in thread engagement.

[0060] The second adjustment mechanism 11 includes a second adjustment screw 11-1 and a second screwing part 11-3 provided on the second adjustment screw 11-1 extending out of the top of the portal bracket. The second adjustment screw 11-1 is threadedly connected when it passes through the right connecting block 13 of the third intermediate shaft 9-3, and is clearance-fitted when it passes through the right connecting block 13 of the second intermediate shaft 9-2.

[0061] In this embodiment, the portal frame includes two columns 9-8 and a horizontal plate 9-9 connected to the top of the two columns 9-8. The bottom of the columns 9-8 is provided with an extension plate 9-7 connected to the base 1. The length direction of the horizontal plate 9-9 is perpendicular to the extension direction of the bridge cable.

[0062] The first adjusting screw 10-1 and the second adjusting screw 11-1 are arranged along the height direction of the column 9-8 and their tops pass through the horizontal plate 9-9. The column 9-8 is provided with a first lower seat bearing 10-2 and a second lower seat bearing 11-2 for the bottom ends of the first adjusting screw 10-1 and the second adjusting screw 11-1 to be rotatably mounted. The horizontal plate 9-9 is provided with an internal bearing for the upper part of the first adjusting screw 10-1 and the second adjusting screw 11-1 to be rotatably mounted.

[0063] In this embodiment, the interior of the column 9-8 is provided with a sliding groove 15 for the left connecting block 12 and the right connecting block 13 to slide. Locking bolts 14 are inserted in the left connecting block 12 and the right connecting block 13 so that after the second intermediate shaft 9-2 and the third intermediate shaft 9-3 are adjusted into place, the locking bolts 14 are tightened to make tight contact with the column 9-8, thereby locking the second intermediate shaft 9-2 and the third intermediate shaft 9-3.

[0064] In this embodiment, the load-bearing spring 4-6 is in a compressed state. Furthermore, the load-bearing spring 4-6 is replaceable to meet requirements. The vertical rod 4-5 is provided with a threaded section that mates with the locking nut 4-7.

[0065] The mounting plate 4-4 is installed on the bridge deck so that the first base 4 and the second base 5 can be installed on both sides of the bridge expansion joint.

[0066] The vertical rod 4-5, the load-bearing spring 4-6, and the carrier plate 4-3 are provided for the installation of the lower ball seat 4-1. This is done for several reasons: First, to avoid directly installing the lower ball seat 4-1 on the mounting plate 4-4, and to prevent unevenness of the bridge structure from affecting the horizontal installation of the lower ball seat 4-1. Second, to allow the carrier plate 4-3 to move up and down along the vertical rod 4-5 according to the required installation height of the bridge cable, and to lock the carrier plate 4-3 in place using the locking nut 4-7, thus improving adaptability. Third, the load-bearing spring 4-6, added between the carrier plate 4-3 and the mounting plate 4-4, not only provides upward force support for the carrier plate 4-3, but also forms an elastic base with the carrier plate 4-3. This allows the bridge cable 8 to compensate for its deformation when it expands or contracts by squeezing the elastic base through the load-bearing bracket.

[0067] In this embodiment, the lower ball seat cover plate 4-2 is detachably connected to the lower ball seat 4-1 by bolts. This is so that the lower ball head 2-2 is installed in the lower ball seat 4-1 first, and then the lower ball seat cover plate 4-2 is installed, thereby realizing the ball pin hinge. In addition, the lower ball seat cover plate 4-2 is set to limit the lower ball head 2-2 in order to limit the exposed volume of the lower ball head 2-2 and the upper ball head 2-3, so that the exposed volume is less than 1 / 2 of the volume of the ball head, so that the ball head will not slip when rotating around the ball seat in multiple degrees of freedom.

[0068] In this embodiment, the lower end of the intermediate connecting rod 2-1 is threadedly connected to the lower connecting rod 2-4, and the upper end of the intermediate connecting rod 2-1 is threadedly connected to the upper connecting rod 2-5.

[0069] In this embodiment, by setting the intermediate connecting rod 2-1 to connect the lower connecting rod 2-4 and the upper connecting rod 2-5, the lower ball head 2-2 and the upper collar 2-3 are set at both ends of the intermediate connecting rod 2-1. The intermediate connecting rod 2-1 is detachably connected to the lower connecting rod 2-4 and the upper connecting rod 2-5, which facilitates the adjustment of the length of the intermediate connecting rod 2-1 to adapt to expansion joints of different sizes, effectively improving adaptability.

[0070] In this embodiment, both the lower connecting rod 2-4 and the upper connecting rod 2-5 include a screw section extending into the threaded hole of the intermediate connecting rod 2-1 and an outer rod portion integrally formed with the screw section. The outer diameter of the outer rod portion is the same as the outer diameter of the intermediate connecting rod 2-1.

[0071] In this embodiment, in actual use, the two ends of the bridge cable 8 are provided with end brackets 6, which are set on the bridge surface. The end brackets 6 can be the end brackets in patent 202010777224.9.

[0072] In this embodiment, a first adjustment mechanism 10 and a second adjustment mechanism 11 are provided. The first adjustment mechanism 10 pushes the second clamping wheel 9-5 to move, thereby adjusting the lower channel spacing between the second clamping wheel 9-5 and the first clamping wheel 9-4. The second adjustment mechanism 11 pushes the third clamping wheel 9-6 to move, thereby adjusting the upper channel spacing between the third clamping wheel 9-6 and the second clamping wheel 9-5, until the upper and lower channels meet the diameter requirements of the bridge cable. This improves the convenience of adjustment and adapts to bridge cables of different diameters, making it highly adaptable.

[0073] In this embodiment, a portal frame 9 is provided to install the first clamping wheel 9-4, the second clamping wheel 9-5 and the third clamping wheel 9-6, and facilitates the integrated installation of the first adjustment mechanism 10 and the second adjustment mechanism 11. The overall structure is compact and adaptable to the requirements of cable threading and clamping on upper and lower bridges.

[0074] In this embodiment, the arc-shaped grooves of the first clamping wheel 9-4, the second clamping wheel 9-5, and the third clamping wheel 9-6 are set to clamp the upper and lower bridge cables 8. When the state of the two multi-degree-of-freedom swing rods changes, the bridge cables 8 can be moved without being damaged.

[0075] In this embodiment, the first adjusting screw 10-1 is rotated by the first screwing part 10-3. Under the threaded connection of the first adjusting screw 10-1 and the left connecting block 12 of the second intermediate shaft 9-2 and the sliding of the right connecting block 13 of the second intermediate shaft 9-2 embedded in the sliding groove 15, the second clamping wheel 9-5 on the second intermediate shaft 9-2 is driven to move closer to or away from the first clamping wheel 9-4.

[0076] The second adjusting screw 11-1 is rotated by the second screwing part 11-3. When the second adjusting screw 11-1 passes through the right connecting block 13 of the third intermediate shaft 9-3, the threaded connection and the sliding groove 15 embedded in the left connecting block 12 of the third intermediate shaft 9-3 cause the third clamping wheel 9-6 on the third intermediate shaft 9-3 to move closer to or away from the first clamping wheel 9-4, thereby adapting to bridge cables of different diameters.

[0077] In this embodiment, when adjustment is required, first loosen the locking bolt 14 to release the locking of the second intermediate shaft 9-2 and the third intermediate shaft 9-3; after the second intermediate shaft 9-2 and the third intermediate shaft 9-3 are adjusted into place, tighten the locking bolt 14 to make it tightly contact the column 9-8, thereby locking the second intermediate shaft 9-2 and the third intermediate shaft 9-3.

[0078] In practical application, when the bridge expansion joint 7 expands and contracts, the expansion and contraction of the bridge expansion joint 7 can be converted into changes at the hinged ends of the first multi-degree-of-freedom swing arm 2 and the second multi-degree-of-freedom swing arm 3, thereby adjusting the support state of the bridge cable 8. The lower ball head 2-2 can rotate freely in the lower ball seat 4-1, thus adapting to different motion states. It can adapt not only to expansion and contraction in the horizontal direction, but also to longitudinal offset of the bridge, so that the expansion device can meet the requirements of flexible compensation in multiple directions.

[0079] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A bridge cable expansion joint, characterized in that: It includes a support bracket for clamping and threading bridge cables (8), a base (1) set at the bottom of the support bracket, a first base (4) set on one side of the bridge expansion joint (7), a second base (5) set on the other side of the bridge expansion joint (7), a first multi-degree-of-freedom swing rod (2) connecting the base (1) and the first base (4), and a second multi-degree-of-freedom swing rod (3) connecting the base (1) and the second base (5); The first multi-degree-of-freedom pendulum (2) and the second multi-degree-of-freedom pendulum (3) both include an intermediate connecting rod (2-1), a lower ball pin connected to the intermediate connecting rod (2-1), and an upper hinge connected to the intermediate connecting rod (2-1). The two lower ball pins and the first base (4) are ball-hinged with the second base (5). The two upper hinges are shaft-hinged with the base (1). The support bracket includes a portal frame (9) mounted on a base (1) and a first clamping wheel (9-4), a second clamping wheel (9-5), and a third clamping wheel (9-6) arranged sequentially from bottom to top within the portal frame (9). The first clamping wheel (9-4) is fixed within the portal frame. The portal frame is provided with a first adjustment mechanism (10) for adjusting the second clamping wheel (9-5) to move closer to or further away from the first clamping wheel (9-4) and a second adjustment mechanism (11) for adjusting the third clamping wheel (9-6) to move closer to or further away from the second clamping wheel (9-5).

2. A bridge cable expansion joint according to claim 1, characterized in that: The first base (4) and the second base (5) both include a mounting plate (4-4), a vertical rod (4-5) set on the mounting plate (4-4), a carrier plate (4-3) sleeved on the vertical rod (4-5), a bearing spring (4-6) sleeved on the vertical rod (4-5), and a locking nut (4-7) locked on the vertical rod (4-5). The bearing spring (4-6) is located between the mounting plate (4-4) and the carrier plate (4-3). The lower end of the bearing spring (4-6) abuts against the top surface of the mounting plate (4-4), and the upper end of the bearing spring (4-6) abuts against the bottom surface of the carrier plate (4-3).

3. A bridge cable expansion joint according to claim 2, characterized in that: The lower ball pin includes a lower connecting rod (2-4) that is detachably inserted into the lower end of the intermediate connecting rod (2-1) and a lower ball head (2-2) integrally formed with the lower connecting rod (2-4). The carrier plate (4-3) is provided with a lower ball seat (4-1) for ball hinge of the lower ball head (2-2). The lower ball seat (4-1) is provided with a lower ball seat cover plate (4-2) for limiting the lower ball head (2-2). The lower ball seat cover plate (4-2) is provided with a lower through hole for the lower ball head (2-2) to pass through. The upper hinge includes an upper connecting rod (2-5) that is detachably inserted into the upper end of the intermediate connecting rod (2-1), and an upper collar (2-3) connected to the upper connecting rod (2-5). The base (1) has a hinge shaft (1-1) at the bottom for fitting two upper collars (2-3).

4. A bridge cable expansion joint according to claim 1, characterized in that: A lower channel is formed between the first clamping wheel (9-4) and the second clamping wheel (9-5) for clamping and passing through the lower bridge cable, and an upper channel is formed between the second clamping wheel (9-5) and the third clamping wheel (9-6) for clamping and passing through the upper bridge cable. A first intermediate shaft (9-1) is inserted through the first clamping wheel (9-4), and both ends of the first intermediate shaft (9-1) are arranged inside the portal frame; The second clamping wheel (9-5) is provided with a second intermediate shaft (9-2), and the third clamping wheel (9-6) is provided with a third intermediate shaft (9-3). The first clamping wheel (9-4), the second clamping wheel (9-5), and the third clamping wheel (9-6) can rotate around the first intermediate shaft (9-1), the second intermediate shaft (9-2), and the third intermediate shaft (9-3), respectively.

5. A bridge cable expansion joint according to claim 4, characterized in that: The left and right ends of the second intermediate shaft (9-2) and the third intermediate shaft (9-3) are each provided with a left connecting block (12) and a right connecting block (13); The first adjustment mechanism (10) includes a first adjustment screw (10-1) and a first screwing part (10-3) provided on the first adjustment screw (10-1) extending out of the top of the portal bracket. The first adjustment screw (10-1) passes through the through hole of the left connecting block (12) of the third intermediate shaft (9-3) with clearance fit. The first adjustment screw (10-1) passes through the threaded hole of the left connecting block (12) of the second intermediate shaft (9-2) with thread fit. The second adjustment mechanism (11) includes a second adjustment screw (11-1) and a second screwing part (11-3) disposed on the second adjustment screw (11-1) passing through the top of the portal frame. The second adjustment screw (11-1) is threadedly connected when it passes through the right connecting block (13) of the third intermediate shaft (9-3), and is clearance-fitted when it passes through the right connecting block (13) of the second intermediate shaft (9-2).

6. A bridge cable expansion joint according to claim 5, characterized in that: The portal frame includes two columns (9-8) and a horizontal plate (9-9) connected to the top of the two columns (9-8). The bottom of the columns (9-8) is provided with an extension plate (9-7) connected to the base (1). The length direction of the horizontal plate (9-9) is perpendicular to the extension direction of the bridge cable. The first adjusting screw (10-1) and the second adjusting screw (11-1) are arranged along the height direction of the column (9-8) and their tops pass through the horizontal plate (9-9). The column (9-8) is provided with a first lower seat bearing (10-2) and a second lower seat bearing (11-2) for rotatably mounting the bottom ends of the first adjusting screw (10-1) and the second adjusting screw (11-1). The horizontal plate (9-9) is provided with an internal bearing for rotatably mounting the upper parts of the first adjusting screw (10-1) and the second adjusting screw (11-1).

7. A bridge cable expansion joint according to claim 6, characterized in that: The column (9-8) is provided with a sliding groove (15) for the left connecting block (12) and the right connecting block (13) to slide. Locking bolts (14) are provided in the left connecting block (12) and the right connecting block (13) so that after the second intermediate shaft (9-2) and the third intermediate shaft (9-3) are adjusted into place, the locking bolts (14) are tightened to make them tightly contact the column (9-8) and lock the second intermediate shaft (9-2) and the third intermediate shaft (9-3).

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