A constraint assembly and constraint mechanism for longitudinal elastic cables in a tower-beam bridge.

Abstract

This application relates to a constraint component and mechanism for a longitudinal elastic cable of a tower-beam bridge, belonging to the field of bridge constraint structure technology. It includes two constraint units arranged opposite each other along the longitudinal direction of the bridge. Each constraint unit includes a main tower anchorage and an elastic cable with foundation pretension. The main tower anchorage is located on the main tower. The elastic cable includes an anchoring end and a locking end. The anchoring end is used to anchor to the main beam at a predetermined distance from the main tower. When the anchoring end is in place or moves away from the main tower, the locking end locks onto the main tower anchorage. When the anchoring end moves closer to the main tower, the locking end remains relatively fixed relative to the main beam. Because the locking end locks onto the main tower anchorage when the anchoring end moves away from the main tower, it does not affect the tension of the elastic cable. When the anchoring end moves closer to the main tower, the locking end remains relatively fixed relative to the main beam. The length of the elastic cable remains unchanged as the anchoring end moves with the main beam, preventing unloading.

Description

Technical Field

[0001] This invention relates to the field of bridge restraint structure technology, specifically to a restraint component and restraint mechanism for longitudinal elastic cables of towers and beams. Background Technology

[0002] Based on the constraint state between the towers and the main girder, the longitudinal restraint structure of cable-stayed bridges can be divided into semi-floating structures, fixed-restraint structures, and elastic cable structures. A semi-floating structure involves no longitudinal restraint between the towers and the main girder. For long-span cable-stayed bridges (both highway and railway), under the influence of live loads, temperature, and longitudinal winds, the longitudinal horizontal displacement of the main girder is significant, exceeding the expansion and contraction capacity of conventional beam-end expansion joints, making its application difficult. A fixed-restraint structure restrains one side of the tower and the main girder while relaxing the other side. The zero point of temperature deformation of the main girder is located at the restrained side tower, resulting in a large temperature span and displacement at the relaxed side beam end. This may also present challenges in implementing beam-end expansion joints. Furthermore, it may result in large seismic bending moments on the fixed side tower and large temperature-induced bending moments on the relaxed side tower, making it difficult to apply in long-span cable-stayed bridges (both highway and railway). Elastic cable structure is an elastic cable structure with a specific stiffness set between the bridge tower and the main beam to constrain the horizontal displacement between the bridge and the main beam. By optimizing the stiffness of the elastic cable, an elastic cable with appropriate stiffness can be selected so that the expansion and contraction displacement of the beam end and the stress on the main tower are within a controllable range, making it an ideal constraint system.

[0003] In existing technologies, due to the relative displacement between the main beam and the bridge tower, which can be left or right, the elastic cable may be under tension or relaxed. In order to ensure that the elastic cable maintains a certain tension after maximum relaxation without being unloaded, the elastic cable is pre-tensioned in engineering, with the minimum pretension being the maximum relaxation force.

[0004] However, for long-span cable-stayed bridges for both highways and railways, the prestressing significantly increases the internal forces of the main girder under dead load. This raises the issue of reinforcing the main girder to cope with the increased internal forces of the main girder under dead load, thereby increasing the amount of material used in the main girder and raising the cost of the bridge. Summary of the Invention

[0005] This application provides a constraint component and constraint mechanism for the longitudinal elastic cable of the tower-beam bridge, which can solve the problem in the prior art that for long-span railway-highway cable-stayed bridges, the large pretension increases the internal force of the main beam's dead load, and there is a need to strengthen the main beam to cope with the increased internal force of the main beam's dead load, which increases the amount of material used in the main beam and increases the cost of the bridge.

[0006] In a first aspect, embodiments of this application provide a constraint assembly for a longitudinal elastic cable of a tower-beam structure, comprising two constraint units arranged opposite each other along the longitudinal direction of the bridge. Each constraint unit includes a main tower anchorage and an elastic cable with foundation pretension. The main tower anchorage is fixedly mounted on the main tower. The elastic cable includes an anchoring end and a snap-fit ​​end. The anchoring end is anchored to a main beam at a predetermined distance from the main tower. When the anchoring end is in its original position or moves away from the main tower, the snap-fit ​​end is snapped onto the main tower anchorage. When the anchoring end moves towards the main tower, the snap-fit ​​end is relatively fixed relative to the main beam.

[0007] In conjunction with the first aspect, in one embodiment, the main tower anchorage is provided with a second through hole arranged along the bridge direction, the elastic cable passes through the second through hole, and when the anchorage end is in place or moves away from the main tower, the snap-fit ​​end is snapped at the end of the second through hole away from the anchorage end.

[0008] In conjunction with the first aspect, in one embodiment, a pressure-bearing pipe is provided in the second through hole, the pressure-bearing pipe passes through the main tower anchor seat for the elastic cable to pass through, and the snap-fit ​​end abuts against the end of the pressure-bearing pipe away from the anchor end. When the anchor end is moving towards the main tower, the position of the pressure-bearing pipe and the main beam is relatively fixed.

[0009] In conjunction with the first aspect, in one embodiment, the constraint unit further includes a beam support seat, which is used to be disposed on the main beam and to abut against the end of the pressure-bearing pipe near the anchoring end. The beam support seat is provided with a first through hole through which the elastic cable passes. When the anchoring end is moving towards the main tower, the beam support seat drives the pressure-bearing pipe to move, so that the snap-fit ​​end is relatively fixed relative to the position of the main beam.

[0010] In conjunction with the first aspect, in one embodiment, the snap-fit ​​end is provided with an anchor ring, and the end of the pressure-bearing pipe that snaps with the anchor ring is provided with a first pad. When the anchoring end is in its original position or moves away from the main tower, the first pad abuts against the main tower anchoring seat, and the anchor ring snaps with the first pad.

[0011] In conjunction with the first aspect, in one embodiment, when the main tower and the main beam undergo relative displacement, the elastic cable of one of the constraint units is stretched, the first pad is pressed against the main tower anchorage, the beam support seat is separated from the pressure pipe by a first predetermined distance, the elastic cable of the other constraint unit is at its initial length, the beam support seat is pressed against the end of the pressure pipe near the anchorage, the first pad is separated from the main tower anchorage by a second predetermined distance, and the first predetermined distance and the second predetermined distance are equal.

[0012] In conjunction with the first aspect, in one embodiment, the main tower anchorage is provided with a third pad, which is used to abut against the first pad.

[0013] In conjunction with the first aspect, in one embodiment, a second pad is provided at the end of the pressure-bearing pipe away from the anchor ring, the second pad being used to abut against the support seat on the beam.

[0014] In conjunction with the first aspect, in one embodiment, the constraint unit further includes a beam anchorage seat, which is used to be disposed on the main beam, and the anchorage end is disposed on the beam anchorage seat and located on the extension line of the axis of the second through hole.

[0015] Secondly, embodiments of this application also provide a constraint mechanism for a longitudinal elastic cable of a tower-beam, which includes a plurality of the aforementioned constraint components for longitudinal elastic cables of a tower-beam.

[0016] The beneficial effects of the technical solutions provided in this application include:

[0017] When using the constraint assembly for the longitudinal elastic cable of the tower-beam bridge, two constraint units are set opposite each other along the longitudinal direction of the bridge. The main tower anchorage is fixed on the main tower. The anchorage end of the elastic cable is used to anchor on the main beam at a set distance from the main tower. When the anchorage end is in place or moves away from the main tower, the snap-fit ​​end is snapped on the main tower anchorage. When the anchorage end moves towards the main tower, the snap-fit ​​end is fixed relative to the position of the main beam. When the anchorage end is in place or moves away from the main tower, the snap-fit ​​end is secured to the anchorage seat on the main tower, which does not affect the tension of the elastic cable. When the anchorage end moves closer to the main tower, the snap-fit ​​end is relatively fixed in position with the main beam, and the anchorage end moves with the main beam. That is, the length of the elastic cable remains unchanged, and there will be no unloading. Only the tension of the foundation needs to be preset in the elastic cable. There is no need to set the pretension to the maximum relaxation force of the conventional elastic cable. This solves the problem in the existing technology for long-span cable-stayed bridges for highways and railways that the pretension increases the internal force of the dead load of the main beam, which requires strengthening the main beam to cope with the increased internal force of the dead load, thus increasing the amount of material used in the main beam and increasing the cost of the bridge. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a constraint component for a longitudinal elastic cable of a tower-beam bridge according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a constraint component for a longitudinal elastic cable in a tower-beam bridge according to the present invention, in which the anchorage end is in place.

[0021] Figure 3 This is a schematic diagram of the structure of a constraint component for a longitudinal elastic cable of a tower-beam bridge according to the present invention, when the anchor end moves away from the main tower.

[0022] Figure 4 This is a schematic diagram of the structure of a constraint component for a longitudinal elastic cable of a tower-beam bridge according to the present invention, when the anchor end moves toward the main tower.

[0023] Figure 5 This is a schematic diagram of an embodiment of a constraint mechanism for a longitudinal elastic cable of a tower-beam bridge according to the present invention.

[0024] In the figure: 11, main tower anchorage; 111, third pad; 12, pressure pipe; 121, first pad; 122, second pad; 2, elastic cable; 21, anchor ring; 3, main tower; 4, main beam; 5, beam support; 6, beam anchorage; 10, constraint unit. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0026] This application provides a constraint component and constraint mechanism for the longitudinal elastic cable of the tower-beam bridge, which can solve the problem in the prior art that for long-span railway-highway cable-stayed bridges, the large pretension increases the internal force of the main beam's dead load, and there is a need to strengthen the main beam to cope with the increased internal force of the main beam's dead load, which increases the amount of material used in the main beam and increases the cost of the bridge.

[0027] like Figures 1-5As shown, this application provides a constraint assembly for a longitudinal elastic cable of a tower-beam structure, which includes two constraint units 10 arranged opposite each other along the longitudinal direction of the bridge. Each constraint unit 10 includes a main tower anchorage 11 and an elastic cable 2 with foundation pretension. The main tower anchorage 11 is fixedly mounted on the main tower 3. The elastic cable 2 includes an anchoring end and a snap-fit ​​end. The anchoring end is used to anchor to the main beam 4 at a predetermined distance from the main tower 3. When the anchoring end is in place or moves away from the main tower 3, the snap-fit ​​end is snapped onto the main tower anchorage 11. When the anchoring end moves towards the main tower 3, the snap-fit ​​end is relatively fixed relative to the main beam 4.

[0028] When using the constraint assembly for the elastic cable in the longitudinal direction of the tower and beam, two constraint units 10 are arranged opposite each other in the longitudinal direction of the bridge, and the main tower anchorage 11 is fixed on the main tower 3. The anchorage end of the elastic cable 2 is used to anchor on the main beam 4 at a set distance from the main tower 3. When the anchorage end is in place or moves away from the main tower 3, the snap-fit ​​end is snapped on the main tower anchorage 11. When the anchorage end moves towards the main tower 3, the snap-fit ​​end is fixed relative to the position of the main beam 4. When the anchoring end is in place or moves away from the main tower 3, the snap-fit ​​end is snapped onto the anchoring seat 11 of the main tower, which will not affect the tension of the elastic cable 2. When the anchoring end moves towards the main tower 3, the snap-fit ​​end and the main beam 4 are relatively fixed in position, and the anchoring end moves with the main beam 4. That is, the length of the elastic cable 2 remains unchanged and there will be no unloading. Only the tension of the foundation needs to be preset in the elastic cable 2. There is no need to set the pretension to the maximum relaxation force of the conventional elastic cable. This solves the problem in the existing technology that for long-span cable-stayed bridges, the pretension increases the internal force of the dead load of the main beam. In order to cope with the increased internal force of the dead load of the main beam, the main beam needs to be reinforced, the amount of material used in the main beam is increased, and the bridge construction cost is increased.

[0029] like Figures 2-4 As shown, in some optional embodiments, the main tower anchorage 11 is provided with a second through hole arranged along the bridge direction. The elastic cable 2 passes through the second through hole. When the anchorage end is in place or moves away from the main tower 3, the snap-fit ​​end is snapped at the end of the second through hole away from the anchorage end.

[0030] In this embodiment, a second through hole is provided on the main tower anchorage 11 along the bridge direction. The elastic cable 2 passes through the second through hole. When the anchorage end is in place or moves away from the main tower 3, the snap-fit ​​end is snapped at the end of the second through hole away from the anchorage end. Passing the elastic cable 2 through the second through hole can prevent the elastic cable 2 from detaching from the main tower anchorage 11, thereby improving the stability of the constraint component for the elastic cable along the bridge direction of the tower beam.

[0031] like Figures 2-4As shown, in some optional embodiments, a pressure-bearing pipe 12 is provided in the second through hole. The pressure-bearing pipe 12 passes through the main tower anchor seat 11 and is used to allow the elastic cable 2 to pass through. The snap-fit ​​end abuts against the end of the pressure-bearing pipe 12 away from the anchor end. When the anchor end is moving towards the main tower 3, the position of the pressure-bearing pipe 12 and the main beam 4 is relatively fixed.

[0032] In this embodiment, a pressure-bearing tube 12 is provided in the second through hole. The pressure-bearing tube 12 passes through the main tower anchorage 11 and can slide in the second through hole. The elastic cable 2 passes through the pressure-bearing tube 12, and the snap-fit ​​end abuts against the end of the pressure-bearing tube 12 away from the anchorage end. When the anchorage end is moving towards the main tower 3, the position of the pressure-bearing tube 12 and the main beam 4 is relatively fixed. As the main beam 4 moves, the position of the snap-fit ​​end and the main beam 4 is relatively fixed. When the anchorage end is in place or moving away from the main tower 3, the end of the pressure-bearing tube 12 away from the anchorage end abuts against the main tower anchorage 11, reducing the possible loss caused by the contact between the snap-fit ​​end and the main tower anchorage 11, and improving the stability of the constraint component for the longitudinal elastic cable of the tower beam.

[0033] like Figures 1-4 As shown, in some optional embodiments, the constraint unit 10 also includes a beam support 5, which is used to be mounted on the main beam 4 and to abut against the end of the pressure pipe 12 near the anchoring end. The beam support 5 is provided with a first through hole through which the elastic cable 2 passes. When the anchoring end is moving towards the main tower 3, the beam support 5 drives the pressure pipe 12 to move, so that the snap-fit ​​end is relatively fixed relative to the position of the main beam 4.

[0034] In this embodiment, the constraint unit 10 also includes a beam support 5, which is used to be installed on the main beam 4 and to abut against the end of the pressure-bearing pipe 12 near the anchoring end. The beam support 5 is provided with a first through hole through which the elastic cable 2 passes. When the anchoring end is moving towards the main tower 3, the beam support 5 drives the pressure-bearing pipe 12 to move, so that the snap-fit ​​end is relatively fixed with the position of the main beam 4. When the anchoring end is in the original position, the beam support 5 abuts against the end of the pressure-bearing pipe 12 near the anchoring end. When the anchoring end is moving away from the main tower 3, the beam support 5 separates from the pressure-bearing pipe 12. The use of the beam support 5 to drive the pressure-bearing pipe 12 to move does not affect the tensioning use of the elastic cable 2, and the beam support 5 is not easily damaged.

[0035] like Figures 2-4 As shown, in some optional embodiments, the snap-fit ​​end is provided with an anchor ring 21, and the end of the pressure pipe 12 that snaps with the anchor ring 21 is provided with a first pad 121. When the anchoring end is in place or moves away from the main tower 3, the first pad 121 abuts against the main tower anchoring seat 11, and the anchor ring 21 snaps with the first pad 121.

[0036] In this embodiment, an anchor ring 21 is provided on the snap-fit ​​end. A first pad 121 is provided at the end of the pressure-bearing pipe 12 that snaps into the anchor ring 21. The anchor ring 21 is used to snap into the first pad 121. When the anchoring end is in place or moves away from the main tower 3, the first pad 121 abuts against the main tower anchor seat 11, and the anchor ring 21 snaps into the first pad 121. When the anchoring end is moving towards the main tower 3, the anchor ring 21 and the first pad 121 move away from the main tower anchor seat 11 simultaneously. The structure is simple and easy to snap into.

[0037] like Figures 1-4 As shown, in some optional embodiments, when the main tower 3 and the main beam 4 undergo relative displacement, the elastic cable 2 of one of the constraint units 10 is stretched, the first pad 121 is pressed against the main tower anchor seat 11, the beam support seat 5 is separated from the pressure pipe 12 by a first predetermined distance, the elastic cable 2 of the other constraint unit 10 is at its initial length, the beam support seat 5 is pressed against the end of the pressure pipe 12 near the anchor end, the first pad 121 is separated from the main tower anchor seat 11 by a second predetermined distance, and the first predetermined distance and the second predetermined distance are equal.

[0038] In this embodiment, when the main tower 3 and the main beam 4 undergo relative displacement, the elastic cable 2 of one of the constraint units 10 is stretched, the first pad 121 is pressed against the main tower anchorage 11, the position of the pressure pipe 12 remains unchanged, the support seat 5 on the beam separates from the pressure pipe 12 by a first set distance, which is the extension length of the elastic cable 2. The elastic cable 2 of the other constraint unit 10 is at its initial length, the support seat 5 on the beam is pressed against the end of the pressure pipe 12 near the anchorage end, causing the pressure pipe 12 to move away from the anchorage end. The first pad 121 separates from the main tower anchorage 11 by a second set distance. The first set distance and the second set distance are equal. The first set distance is affected by the tensile capacity of the elastic cable 2, and the second set distance is affected by the length of the pressure pipe 12 extending out of the second through hole when the anchorage end is in its original position. The first set distance and the second set distance are equal, which can prevent the elastic cable 2 from being overstretched and damaged.

[0039] like Figures 2-4 As shown, in some optional embodiments, the main tower anchorage 11 is provided with a third pad 111, which is used to abut against the first pad 121.

[0040] In this embodiment, a third pad 111 is provided on the main tower anchorage 11. The third pad 111 is used to abut against the first pad 121 to prevent the first pad 121 from contacting the main tower anchorage 11 too many times, causing structural damage. This would result in the first pad 121 being unable to abut against the main tower anchorage 11 when the anchorage end is moving away from the main tower 3, causing the pressure-bearing pipe 12 to be dislodged from the second through hole, thus affecting the structural stability of the constraint component used for the longitudinal elastic cable of the tower beam.

[0041] like Figures 2-4 As shown, in some optional embodiments, the end of the pressure pipe 12 away from the anchor ring 21 is provided with a second pad 122, which is used to abut against the support seat 5 on the beam.

[0042] In this embodiment, a second pad 122 is provided at the end of the pressure-bearing pipe 12 away from the anchor ring 21. The second pad 122 is used to abut against the beam support seat 5. When the anchoring end is in place or moves towards the main tower 3, the beam support seat 5 abuts against the second pad 122 to prevent excessive contact between the pressure-bearing pipe 12 and the beam support seat 5, which would cause structural damage and affect the length of the pressure-bearing pipe 12 extending out of the second through hole. When the anchoring end moves towards the main tower 3, the elastic cable 2 is unloaded, which affects the structural stability of the constraint component for the elastic cable in the longitudinal direction of the tower and beam.

[0043] like Figures 2-4 As shown, in some optional embodiments, the constraint unit 10 further includes a beam anchorage 6, which is used to be installed on the main beam 4, and the anchorage end is installed on the beam anchorage 6 and located on the extension line of the axis of the second through hole.

[0044] In this embodiment, the constraint unit 10 also includes a beam anchorage 6, which is used to be installed on the main beam 4. The anchorage end is installed on the beam anchorage 6 and is located on the extension line of the axis of the second through hole, which facilitates the connection between the anchorage end and the main beam 4 and makes it easier to realize that the anchorage end is located on the extension line of the axis of the second through hole, thereby improving the structural stability of the constraint component used for the longitudinal elastic cable of the tower beam.

[0045] like Figures 1-5 As shown, this application also provides a constraint mechanism for longitudinal elastic cables of a tower-beam bridge, which includes a plurality of the above-described constraint components for longitudinal elastic cables of a tower-beam bridge.

[0046] When using the constraint assembly for the elastic cable in the longitudinal direction of the tower and beam, two constraint units 10 are arranged opposite each other in the longitudinal direction of the bridge, and the main tower anchorage 11 is fixed on the main tower 3. The anchorage end of the elastic cable 2 is used to anchor on the main beam 4 at a set distance from the main tower 3. When the anchorage end is in place or moves away from the main tower 3, the snap-fit ​​end is snapped on the main tower anchorage 11. When the anchorage end moves towards the main tower 3, the snap-fit ​​end is fixed relative to the position of the main beam 4. When the anchoring end is in place or moves away from the main tower 3, the snap-fit ​​end is snapped onto the anchoring seat 11 of the main tower, which will not affect the tension of the elastic cable 2. When the anchoring end moves towards the main tower 3, the snap-fit ​​end and the main beam 4 are relatively fixed in position, and the anchoring end moves with the main beam 4. That is, the length of the elastic cable 2 remains unchanged and there will be no unloading. Only the tension of the foundation needs to be preset in the elastic cable 2. There is no need to set the pretension to the maximum relaxation force of the conventional elastic cable. This solves the problem in the existing technology that for long-span cable-stayed bridges, the pretension increases the internal force of the dead load of the main beam. In order to cope with the increased internal force of the dead load of the main beam, the main beam needs to be reinforced, the amount of material used in the main beam is increased, and the bridge construction cost is increased.

[0047] In this example, the amount of elastic cable used in this invention is only half that of conventional elastic cables, thus saving on engineering costs.

[0048] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0049] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A restraint assembly for longitudinal elastic cables in a tower-beam bridge, characterized in that, The system includes two constraint units (10) arranged opposite each other along the bridge direction. Each constraint unit (10) includes a main tower anchorage (11) and an elastic cable (2) with foundation pretension. The main tower anchorage (11) is used to be fixedly installed on the main tower (3). The elastic cable (2) includes an anchoring end and a snap-fit ​​end. The anchoring end is used to anchor on the main beam (4) at a set distance from the main tower (3). When the anchoring end is in place or moves away from the main tower (3), the snap-fit ​​end is snapped onto the main tower anchorage (11). When the anchoring end moves towards the main tower (3), the snap-fit ​​end is fixed relative to the position of the main beam (4). The main tower anchorage (11) is provided with a second through hole along the bridge direction. The elastic cable (2) passes through the second through hole. When the anchorage end is in place or moves away from the main tower (3), the snap-fit ​​end is snapped at the end of the second through hole away from the anchorage end. The second through hole is provided with a pressure-bearing pipe (12), which passes through the main tower anchor seat (11) to allow the elastic cable (2) to pass through. The snap-fit ​​end abuts against the end of the pressure-bearing pipe (12) away from the anchor end. When the anchor end is moving towards the main tower (3), the position of the pressure-bearing pipe (12) and the main beam (4) is relatively fixed. The constraint unit (10) also includes a beam support seat (5), which is used to be installed on the main beam (4) and to abut against the end of the pressure pipe (12) near the anchoring end. The beam support seat (5) is provided with a first through hole through which the elastic cable (2) passes. When the anchoring end is moving towards the main tower (3), the beam support seat (5) drives the pressure pipe (12) to move, so that the snap-fit ​​end is relatively fixed relative to the position of the main beam (4).

2. The constraint assembly for the longitudinal elastic cable of the tower-beam bridge as described in claim 1, characterized in that, The snap-fit ​​end is provided with an anchor ring (21), and the end of the pressure pipe (12) that snaps with the anchor ring (21) is provided with a first pad (121). When the anchor end is in its original position or moves away from the main tower (3), the first pad (121) abuts against the main tower anchor seat (11), and the anchor ring (21) snaps with the first pad (121).

3. A constraint assembly for longitudinal elastic cables of a tower-beam bridge as described in claim 2, characterized in that, When the main tower (3) and the main beam (4) undergo relative displacement, the elastic cable (2) of one of the constraint units (10) is stretched, the first pad (121) is pressed against the main tower anchorage (11), the beam support (5) is separated from the pressure pipe (12) by a first set distance, the elastic cable (2) of the other constraint unit (10) is at its initial length, the beam support (5) is pressed against the end of the pressure pipe (12) near the anchorage end, the first pad (121) is separated from the main tower anchorage (11) by a second set distance, and the first set distance and the second set distance are equal.

4. A constraint assembly for longitudinal elastic cables of a tower-beam bridge as described in claim 2, characterized in that, The main tower anchorage (11) is provided with a third pad (111), which is used to abut against the first pad (121).

5. A constraint assembly for longitudinal elastic cables of a tower-beam bridge as described in claim 2, characterized in that, The end of the pressure pipe (12) away from the anchor ring (21) is provided with a second pad (122), which is used to abut against the support seat (5) on the beam.

6. A constraint assembly for longitudinal elastic cables of a tower-beam bridge as described in claim 1, characterized in that, The constraint unit (10) also includes a beam anchorage (6), which is used to be installed on the main beam (4). The anchorage end is installed on the beam anchorage (6) and is located on the extension line of the axis of the second through hole.

7. A constraint mechanism for longitudinal elastic cables in a tower-beam bridge, characterized in that, It includes multiple constraint components for longitudinal elastic cables of tower beams as described in any one of claims 1-6.

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