Anti-overturning system and method for construction of a swing bridge

Abstract

This application relates to an over-rotation prevention system and method for the construction of a swing bridge. The system includes an annular track fixed to a concrete lower turntable, a fixed limiting device, and a movable limiting device used in conjunction with the fixed limiting device to limit the over-rotation of the support legs fixed to the upper turntable. During the rotation of the upper turntable, the movable limiting device is pushed by the support legs and rotates along the center of the annular track above the annular track. During limiting, the movable limiting device is pushed by the support legs and ultimately abuts against the fixed limiting device. During this abutment, the movable limiting device buffers and dissipates the kinetic energy of the support legs and the swing bridge, reducing impact loads. The system of this application effectively prevents over-rotation during the construction of the swing bridge. By using buffer materials and buffer devices at the collision location, it buffers and reduces the collision force, preventing collision damage to the bridge piers or support legs.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, specifically relating to an anti-over-rotation system and method for the construction of rotating bridges. Background Technology

[0002] Continuous beam rotation construction is generally used for the construction of railway bridges on existing lines. This construction process is usually carried out within a maintenance window, but the maintenance window is very short, sometimes as short as 30 minutes on some busy lines. During construction, the ability of the continuous beam rotation construction device to reasonably connect various processes and quickly respond to emergencies is a major challenge currently encountered in the rotation construction process.

[0003] In a novel continuous beam rotation construction assist and anti-over-rotation device (patent number 201710886898.0), foundations are constructed on both sides of the support legs, and the main beam is placed in a groove. Jacks are used to push the support legs to assist the rotation. A limiting main beam is installed at the rotation endpoint, and a limiting block is used to lock the main beam against the protruding part of the foundation to prevent over-rotation. If over-rotation occurs, the limiting main beam can be moved backward, and jacks are added between the main beam and the support legs. The jacks then push the main beam back to its original position.

[0004] The aforementioned patent achieves the function of preventing over-rotation through the limiting main beam and stop blocks. However, the limiting main beam needs to be installed when the body is about to reach the designed position, which cannot be carried out in advance, resulting in low construction efficiency. Furthermore, no buffer device is set at the collision point between the support legs and the limiting main beam, which may cause damage to the support legs or the limiting main beam during the collision, thus failing to achieve the limiting function.

[0005] In a bridge rotation anti-overturning and anti-tipping system with patent number 201720586103.X, a concrete block and a rubber block located behind the concrete block are used. By setting the rubber block, the rigid impact between the vertical beam and the concrete block is buffered, reducing the probability of impact damage to the vertical beam and the concrete block.

[0006] The aforementioned patent uses simple concrete blocks and rubber blocks to prevent over-rotation. However, due to the composition of its vertical and inclined beam structures, the rigid impact is very large when the massive swing bridge rotates, resulting in poor buffering effect and easy damage. Therefore, it cannot effectively prevent over-rotation of the swing bridge. Summary of the Invention

[0007] The purpose of this invention is to solve the above problems. This application provides an anti-over-rotation system for the construction of a rotating bridge, including an annular slide fixed on the lower concrete turntable, a fixed limiting device and a movable limiting device used in conjunction with the fixed limiting device to limit the over-rotation of the support legs fixed on the upper rotating plate.

[0008] During the rotation of the upper plate of the rotating body, the movable limiting device is pushed by the support foot and rotates along the center of the circular track above the circular slide; when the limiting device is in place, the movable limiting device is pushed by the support foot and finally abuts against the fixed limiting device; when abutting, the movable limiting device buffers and consumes the kinetic energy of the support foot and the rotating bridge and reduces the impact load.

[0009] Based on the above scheme, the movable limiting device includes a holding part for holding the support leg and an abutting part for abutting against the fixed limiting device to block the rotation of the support leg; a plurality of buffers are provided between the holding part and the abutting part for buffering and consuming energy when the support leg pushes the movable limiting device against the fixed limiting device.

[0010] Based on the above scheme, the abutting part includes an abutting plate near the fixed limiting device, a first connecting plate near the holding part, and abutting part side plates disposed on both sides of the abutting plate and the first connecting plate.

[0011] The holding part includes a second connecting plate near the abutting part, a holding plate near the support foot, and holding part side plates disposed on the second connecting plate and on both sides of the holding plate; the holding plate is an arc-shaped plate with the concave surface of the arc near the support foot.

[0012] The buffer is positioned between the first connecting plate and the second connecting plate.

[0013] Based on the above scheme, a first elastic drum is provided between the second connecting plate and the holding plate. The first elastic drum includes a first support plate and two first elastic plates disposed on both sides of the first support plate. The two ends of the first elastic plate are fixed on the first support plate, and the middle protrudes in a direction away from the first support plate. The two ends of the first support plate are respectively fixedly connected to the two holding part side plates of the holding part. The maximum protrusions of the two first elastic plates of the first elastic drum are respectively fixedly connected to the holding plate and the second connecting plate.

[0014] Based on the above scheme, a second elastic drum is provided between the abutment plate and the first connecting plate. The second elastic drum includes a second support plate and two second elastic plates disposed on both sides of the second support plate. The two ends of the second elastic plates are fixed to the second support plate, and the middle protrudes in a direction away from the second support plate. The maximum protrusions of the two second elastic plates of the second elastic drum are fixedly connected to the abutment plate and the first connecting plate, respectively.

[0015] Based on the above scheme, the bottom of the movable limiting device is provided with a traveling wheel for driving the movable limiting device to move, and the inner and outer sides of the annular slide are provided with track grooves for limiting the running trajectory of the traveling wheel.

[0016] Based on the above scheme, the fixed limiting device includes an outer limiting block disposed on the outside of the annular slide and an inner limiting block disposed on the inside of the annular slide.

[0017] Based on the above scheme, a wedge is provided on the side of the outer limiting block near the movable limiting device for precisely adjusting the distance between the movable limiting device and the outer limiting block.

[0018] Based on the above scheme, on the side where the movable limiting device collides with the fixed limiting device, a section of inclined groove is provided in the track groove, and the horizontal height of the inclined groove on the side closer to the fixed limiting device is lower than the horizontal height on the side farther away from the fixed limiting device.

[0019] This application also provides a method for preventing over-rotation during the construction of a swing bridge, specifically, the method uses the system described above.

[0020] This system effectively prevents over-rotation during the construction of a bridge with a rotating structure. By using buffer materials and buffer devices (movable limit devices) at the collision point, it buffers and reduces the impact force, preventing damage to the piers or supports. Inclined grooves within the track channel prevent the rebound of the movable limit devices, thus achieving precise positioning during rotation and saving time for subsequent fine-tuning. This device allows for precise control of the rotation angle during the construction of continuous beams, resulting in high construction efficiency, meeting the tight construction schedule requirements, and ensuring the stable and reliable progress of the construction process. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the concrete lower turntable in the system of this application;

[0022] Figure 2 This is a schematic diagram of the overall structure of the system in this application (in a rotated state);

[0023] Figure 3 This is a schematic diagram of the overall structure of the system in this application (limited position);

[0024] Figure 4 This is a schematic diagram (stereoscopic view) of the active limiting device in the system of this application.

[0025] Figure 5 This is a schematic diagram (top view) of the active limiting device in the system of this application.

[0026] Figure 6 This is a schematic diagram of the structure of the first elastic drum in the active limiting device of the system in this application.

[0027] Figure 7 This is a schematic diagram of the state before the collision during the construction process of an embodiment. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] In the description of this application, it should be noted that the terms "inner," "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used 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 on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Example 1

[0032] like Figure 1-3As shown, this application provides an anti-over-rotation system for the construction of a rotating bridge, including an annular slide 2 fixed on a concrete lower turntable 1. In actual engineering or in some literature patents, the concrete lower turntable 1 is also called the lower bearing platform. A PTFE sliding plate is laid on the annular slide 2. These are all prior art and will not be described in detail here. In addition, the anti-over-rotation system of this application also includes a fixed limiting device 3 and a movable limiting device 5 used in conjunction with the fixed limiting device 3 to limit the over-rotation of the support leg 4 fixed on the upper plate of the rotating body. During the rotation of the upper plate, the movable limiting device 5 is pushed by the support leg 4 and rotates along the center of the annular track above the annular slide 2. When limiting, the movable limiting device 5 is pushed by the support leg 4 and abuts against the fixed limiting device 3. That is to say, the position of the fixed limiting device 3 is pre-constructed on the concrete lower platen 1 according to the construction requirements. The fixed limiting device 3 serves as the foundation of the anti-over-rotation system. In actual construction, the fixed limiting device 3 is constructed simultaneously with the construction of the concrete lower platen 1 (i.e., the two are constructed synchronously). Moreover, the steel bars of the fixed limiting device 3 are connected to the steel bars of the concrete lower platen 1 and are prefabricated simultaneously using concrete. This ensures the stability of the fixed limiting device 3.

[0033] Because support leg 4 is fixed to the rotating platform and is a steel structure (support leg 4 is existing technology), if support leg 4 and the fixed limiting device 3 (reinforced concrete material) are used to directly limit over-rotation during anti-rotation, it may cause a collision between the two and damage to the fixed limiting device 3, or even cause the rotating bridge above support leg 4 to tilt or collapse. Therefore, during the impact, the movable limiting device 5 needs to buffer and dissipate the kinetic energy of support leg 4 and the rotating bridge and reduce the impact load.

[0034] There are many limiting devices that can buffer and dissipate the kinetic energy of the support leg 4 and the slewing bridge during impact, such as commonly used sandboxes and rubber blocks. However, existing devices are prone to damage when preventing over-spinning because the slewing bridge has a very large mass and experiences significant rigid impact during rotation. Since the support leg 4 is a cylindrical structure, using a sandbox for limiting results in limited contact area between the support leg 4 and the sandbox during impact, and the sandbox cannot be fitted with cushioning materials or devices, making it difficult to absorb the energy generated during the collision.

[0035] As a specific implementation plan, such as Figure 4 As shown, this application provides a movable limiting device 5 with a specific structure. The movable limiting device 5 includes a holding part 5-1 for holding the support leg 4 and an abutting part 5-2 for abutting against the fixed limiting device 3 to block the rotation of the support leg 4; a plurality of buffers 5-3 are provided between the holding part 5-1 and the abutting part 5-2 (specifically fixed by welding) for buffering and absorbing energy when the support leg 4 pushes the movable limiting device 5 against the fixed limiting device 3.

[0036] Since the collision process involves energy conversion, the collision time is extremely short when two objects come into contact and collide, resulting in a large impact force relative to the external force. This application uses the buffer 5-3 on the active limit device 5 to buffer energy consumption, thereby extending the collision time and reducing the impact load.

[0037] When the movable limiting device 5 with buffer 5-3 comes into contact with the object, the buffer 5-3 will buffer and dissipate the kinetic energy of the rotating bridge. Specifically, the buffer 5-3 can be a hydraulic buffer or a spring buffer. Figure 4 and Figure 7 It can be seen that the active limit device 5 of this application uses 9 buffers. In fact, in order to reduce the impact load and enhance the effect of buffer energy dissipation, more buffers can be added.

[0038] There are two options for the holding part 5-1. One option is that the holding part 5-1 is directly and tightly held onto the support leg 4, meaning that the entire movable limiting device 5 is fixedly connected to the support leg 4. This method poses a certain risk in actual construction because the movable limiting device 5 itself has a certain weight, which may cause safety hazards when it is held and connected to the support leg 4. In addition to the above method, there is another option where the holding part 5-1 is only formally held onto the support leg 4 and is not connected to the support leg 4.

[0039] As a specific implementation plan, such as Figure 4As shown, the abutment part 5-2 includes an abutment plate 5-21 near the fixed limiting device 3, a first connecting plate 5-22 near the holding part 5-1, and abutment side plates 5-23 disposed on both sides of the abutment plate 5-21 and the first connecting plate 5-22; the holding part 5-1 includes a second connecting plate 5-11 near the abutment part 5-2, a holding plate 5-12 near the support leg 4, and holding side plates 5-13 disposed on both sides of the second connecting plate 5-11 and the holding plate 5-12; the buffer 5-3 is disposed between the first connecting plate 5-22 and the second connecting plate 5-11. Specifically, the holding plate 5-12 is an arc-shaped plate, with the concave surface of the arc close to the support leg 4. This achieves the second type of holding (formal holding) mentioned above. In addition to its holding function, the arc-shaped holding plate 5-12 also provides a certain degree of cushioning. When the support leg 4 pushes the movable limiting device 5 to rotate, the support leg 4 is partially surrounded by the arc-shaped holding plate 5-12. When the abutment plate 5-21 touches the fixed limiting device 3, the support leg 4 will further compress the movable limiting device 5. At this time, the buffer 5-3 will play a cushioning role. However, since the support leg 4 applies force directly to the holding plate 5-12, the holding plate 5-12 will drive the side holding plates 5-13 on both sides to retract towards the support leg 4. This process will also have a cushioning effect on the support leg 4. Figure 4 and 5 As shown, several holding part ribs 5-15 perpendicular to the second connecting plate 5-11 are provided between the second connecting plate 5-11 and the side plate 5-13 of the holding part 5-1. The arrangement of the holding part ribs 5-15 can further enhance the buffering and energy dissipation effect of the holding part 5-1 on the support leg 4.

[0040] Several abutment ribs 5-25, perpendicular to the abutment plate 5-21, are provided between the abutment plate 5-21 and the first connecting plate 5-22 to enhance the support strength of the abutment part 5-2. (The abutment plate 5-21 and the first connecting plate 5-22 are parallel.)

[0041] In the actual manufacturing process, the materials of the abutment plate 5-21, the first connecting plate 5-22, the abutment side plate 5-23, the abutment rib plate 5-25, the second connecting plate 5-11, the holding plate 5-12, the holding side plate 5-13, and the holding rib plate 5-15 are all steel plates, and the plates are fixed together by welding.

[0042] The abutment side plate 5-23 extends toward one side of the holding part 5-1 and is fixedly connected to both sides of the second connecting plate 5-11; this can enhance the integrity between the holding part 5-1 and the abutment part 5-2. To further enhance the integrity, the holding part side plate 5-13, the abutment side plate 5-23 and the abutment plate 5-21 can be a single steel plate. Although this will increase the manufacturing difficulty, it is not a big deal for the construction of the swing bridge.

[0043] While the aforementioned movable limiting device 5 using buffer 5-3 can dissipate the kinetic energy of the rotating bridge (buffer 5-3 is mainly for reducing impact load), this dissipation requires the use of many buffers 5-3. Therefore, based on the above technical solution, an elastic drum can be added to the movable limiting device 5.

[0044] Specifically, such as Figure 5 and 6 As shown, a first elastic drum 5-4 is provided between the second connecting plate 5-11 and the holding plate 5-12. The first elastic drum 5-4 includes a first support plate 5-41 and two first elastic plates 5-42 disposed on both sides of the first support plate 5-41. The two ends of the first elastic plate 5-42 are fixed to the first support plate 5-41, and the middle protrudes away from the first support plate 5-41. The two ends of the first support plate 5-41 are respectively fixedly connected to the two holding part side plates 5-13 of the holding part 5-1. The maximum protrusions of the two first elastic plates 5-42 of the first elastic drum 5-4 are respectively fixedly connected to the holding plate 5-12 and the second connecting plate 5-11. Moreover, as Figure 5 As shown, the connection between the first elastic plate 5-42 and the second connecting plate 5-11 corresponds to the connection between the buffer 5-3 and the second connecting plate 5-11.

[0045] As a more preferred embodiment, a second elastic drum 5-5 is provided between the abutment plate 5-21 and the first connecting plate 5-22. The second elastic drum 5-5 includes a second support plate 5-51 and two second elastic plates 5-52 disposed on both sides of the second support plate 5-51. The two ends of the second elastic plates 5-52 are fixed to the second support plate 5-51, and the middle protrudes in a direction away from the second support plate 5-51. The maximum protrusions of the two second elastic plates 5-52 of the second elastic drum 5-5 are fixedly connected to the abutment plate 5-21 and the first connecting plate 5-22, respectively. Figure 5 The image shows a pattern in which two second elastic drums 5-5 are provided on the abutment part 5-2, and the connection point of a second elastic plate 5-52 of each second elastic drum 5-5 with the first connecting plate 5-22 corresponds to the connection point of the buffer 5-3 with the first connecting plate 5-22.

[0046] Specifically, the first support plate 5-41 and the second support plate 5-51 are made of steel plates, while the first elastic plate 5-42 and the second elastic plate 5-52 are made of curved steel plates. The connections between the two ends of the first elastic plate 5-42 and the first support plate 5-41, and between the two ends of the second elastic plate 5-52 and the second support plate 5-51, are all made of bolts. This improves the spatial force transmission of the first elastic drum 5-4 and the second elastic drum 5-5, and the first support plate 5-41 and the second support plate 5-51 enhance the strength of the elastic drums.

[0047] The use of the first elastic drum 5-4 and the second elastic drum 5-5 allows the semi-elliptical steel plate (curved steel plate) of the elastic drum to produce a large elastic deformation during collision, absorbing the energy generated by the collision and evenly transmitting the impact force generated by the collision. This can fully play the role of buffering and consuming energy. Moreover, it can be used in conjunction with the buffer 5-3 to enhance the overall buffering and energy consumption of the movable limit device 5 and reduce the impact load.

[0048] To mitigate damage when the support leg 4 pushes the movable limiting device 5 and collides with the fixed limiting device 3, the holding plate 5-12 of the movable limiting device 5 is provided with a first anti-collision layer 5-14 on the side near the support leg 4, and a second anti-collision layer 5-24 is provided on the abutment plate 5-21 on the side near the fixed limiting device 3. The first and second anti-collision layers 5-14 and 5-24 can be made of thick rubber pads. This provides a certain buffering effect during impact, prolonging the impact time and preventing damage to the fixed limiting device 3, thus avoiding the problem of the beam (rotating beam) not being accurately positioned.

[0049] Based on the above solution, if the movable limiting device 5 holds the support leg 4 in a formal manner, then in order to make it move more smoothly along the annular slide 2, such as... Figure 7 As shown, the bottom of the movable limiting device 5 is provided with traveling wheels 5-6 for driving the movable limiting device 5 to move, such as... Figure 1 As shown, the annular slide 2 has track grooves 6 on its inner and outer sides to limit the running trajectory of the traveling wheels 5-6. Specifically, the track grooves 6 can be welded from channel steel or steel plates. The traveling wheels 5-6 are placed in the track grooves 6, and their running trajectory is limited by the track grooves 6.

[0050] Since the abutment part 5-2 of the movable limiting device 5 spans across the annular slide 2 and has a certain width, the fixed limiting device 3, if only located on the inner or outer side of the annular slide 2, will not function effectively. Therefore, if... Figure 1 As shown, the fixed limiting device 3 includes an outer limiting block 3-1 disposed on the outside of the annular slide 2 and an inner limiting block 3-2 disposed on the inside of the annular slide 2.

[0051] Because the fixed limiting device 3 is prefabricated on the concrete lower turntable 1, the designed position may deviate during actual construction. Furthermore, during the rotation of the bridge, precise adjustments are needed in the final positioning stage based on the actual construction conditions. Therefore, as a specific implementation plan, a wedge 7 is provided on the side of the outer limiting block 3-1 near the movable limiting device 5 to precisely adjust the distance between the movable limiting device 5 and the outer limiting block 3-1. As an feasible solution, the wedge 7 is made of wood. During the rotation of the bridge, when it has essentially reached the predetermined rotation position, the movable limiting device 5 will first abut against the wedge 7. Due to the material of the wedge 7, it will consume some energy from the movable limiting device 5. Simultaneously, after the movable limiting device 5 abuts against the wedge 7, the rotation position of the bridge can be precisely adjusted by cutting off a portion of the wedge 7, depending on the actual construction conditions.

[0052] During the rotation of the swing bridge, when the movable limiting device 5 collides with the wedge block 7 or the fixed limiting device 3, a reaction force is generated. This reaction force can be quite dangerous during actual construction. To solve this technical problem, such as... Figure 7 As shown, on the side where the movable limiting device 5 collides with the fixed limiting device 3, the track groove 6 is provided with a ramp 6-1. The horizontal height of the ramp 6-1 near the fixed limiting device 3 is lower than the horizontal height of the side away from the fixed limiting device 3. Thus, when the traveling wheel 5-6 drives the movable limiting device 5 to the ramp 6-1, it will move forward and downward along the ramp 6-1, effectively reducing the reaction force upon collision. To further reduce the reaction force, the bottom surface of the ramp 6-1 is concave-convex.

[0053] Example 2

[0054] Based on the anti-over-rotation system for the construction of a swing bridge in Embodiment 1, this application provides an anti-over-rotation method for the construction of a swing bridge, specifically including the following steps:

[0055] (1) When the concrete lower turntable 1 is being constructed, a fixed limiting device 3 is installed at the same time, and an active limiting device 5 is placed in advance on the annular slide 2 to cooperate with the fixed limiting device 3 to prevent the support foot 4 fixed on the upper turntable from over-rotation.

[0056] In actual construction, the fixed limiting device 3 is installed at the same time as the concrete lower turntable 1 (i.e., the two are constructed simultaneously). Moreover, the steel bars of the fixed limiting device 3 are connected to the steel bars of the concrete lower turntable 1, and are precast simultaneously using concrete.

[0057] The movable limit device 5 is prefabricated and placed above the annular slide 2.

[0058] (2) During the rotation of the upper plate of the rotating body, the movable limiting device 5 is pushed by the support foot 4 and rotates above the annular slide 2 along the center of the annular track;

[0059] (3) When the upper plate of the rotating body rotates to the predetermined position, the support leg 4 pushes the movable limiting device 5 against the fixed limiting device 3. During the process of abutting, the movable limiting device 5 buffers and consumes the kinetic energy of the support leg 4 and the rotating bridge and reduces the impact load.

[0060] After the bridge is in place, if the rotating bridge has not fully rotated into position, it needs to be precisely adjusted using wedge 7.

[0061] For details not described in this embodiment, please refer to the content in Embodiment 1.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An anti-overturning system for construction of a swing bridge, comprising a ring slide (2) fixed on a concrete lower turntable (1), characterized in that, It also includes a fixed limiting device (3) and a movable limiting device (5) used in conjunction with the fixed limiting device (3) to prevent over-rotation of the support foot (4) fixed on the rotating plate. During the rotation of the upper plate of the rotating body, the movable limiting device (5) is pushed by the support foot (4) and rotates along the center of the circular track above the circular slide (2); when the limit is reached, the movable limiting device (5) is pushed by the support foot (4) and finally abuts against the fixed limiting device (3); when abutting, the movable limiting device (5) buffers and consumes the kinetic energy of the support foot (4) and the rotating bridge and reduces the impact load. The bottom of the movable limiting device (5) is provided with a walking wheel (5-6) for driving the movable limiting device (5) to move, and the inner and outer sides of the annular slide (2) are provided with track grooves (6) for limiting the running trajectory of the walking wheel (5-6). The fixed limiting device (3) includes an outer limiting block (3-1) disposed on the outside of the annular slide (2) and an inner limiting block (3-2) disposed on the inside of the annular slide (2). The outer limiting block (3-1) is provided with a wedge (7) on the side near the movable limiting device (5) for precisely adjusting the distance between the movable limiting device (5) and the outer limiting block (3-1). On the side where the movable limiting device (5) collides with the fixed limiting device (3), the track groove (6) is provided with a section of inclined groove (6-1), and the horizontal height of the inclined groove (6-1) on the side closer to the fixed limiting device (3) is lower than the horizontal height on the side away from the fixed limiting device (3). The wedge (7) is a wooden block. At the same time, after the movable limiting device (5) abuts against the wedge (7), the rotation position of the rotating bridge can be precisely adjusted by cutting off part of the wedge (7).

2. The anti-cyclining system for construction of a swing bridge according to claim 1, characterized in that, The movable limiting device (5) includes a holding part (5-1) for holding the support leg (4) and an abutting part (5-2) for abutting against the fixed limiting device (3) to block the rotation of the support leg (4); a plurality of buffers (5-3) are provided between the holding part (5-1) and the abutting part (5-2) for buffering and consuming energy when the support leg (4) pushes the movable limiting device (5) against the fixed limiting device (3).

3. The anti-cyclining system for construction of a swing bridge according to claim 2, characterized in that, The abutting part (5-2) includes an abutting plate (5-21) near the fixed limiting device (3), a first connecting plate (5-22) near the holding part (5-1), and abutting part side plates (5-23) disposed on both sides of the abutting plate (5-21) and the first connecting plate (5-22). The holding part (5-1) includes a second connecting plate (5-11) near the abutting part (5-2), a holding plate (5-12) near the support foot (4), and holding part side plates (5-13) disposed on the second connecting plate (5-11) and the holding plate (5-12); the holding plate (5-12) is an arc-shaped plate with the concave surface of the arc near the support foot (4). The buffer (5-3) is disposed between the first connecting plate (5-22) and the second connecting plate (5-11).

4. The anti-cycl ing system for construction of a swing bridge according to claim 3, characterized in that A first elastic drum (5-4) is provided between the second connecting plate (5-11) and the holding plate (5-12). The first elastic drum (5-4) includes a first support plate (5-41) and two first elastic plates (5-42) disposed on both sides of the first support plate (5-41). The two ends of the first elastic plate (5-42) are fixed on the first support plate (5-41), and the middle protrudes in a direction away from the first support plate (5-41). The two ends of the first support plate (5-41) are respectively fixedly connected to the two holding part side plates (5-13) of the holding part (5-1). The maximum protrusion of the two first elastic plates (5-42) of the first elastic drum (5-4) is respectively fixedly connected to the holding plate (5-12) and the second connecting plate (5-11).

5. The anti-over-rotation system for construction of a rotating bridge according to claim 3, characterized in that, A second elastic drum (5-5) is provided between the abutment plate (5-21) and the first connecting plate (5-22). The second elastic drum (5-5) includes a second support plate (5-51) and two second elastic plates (5-52) disposed on both sides of the second support plate (5-51). The two ends of the second elastic plates (5-52) are fixed on the second support plate (5-51), and the middle protrudes in a direction away from the second support plate (5-51). The maximum protrusion of the two second elastic plates (5-52) of the second elastic drum (5-5) is fixedly connected to the abutment plate (5-21) and the first connecting plate (5-22) respectively.

6. A method for preventing over-rotation during the construction of a rotating bridge, characterized in that, Use the system according to any one of claims 1-5.

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