Anti-overturning method for construction of swivel bridge

Abstract

The application relates to a method for preventing over-rotation in the construction of a swivel bridge, wherein when the upper disc of the swivel rotates to a predetermined position, the supporting leg pushes the movable limiting device against the fixed limiting device, thereby preventing over-rotation in the construction of the swivel bridge; meanwhile, the movable limiting device and the fixed limiting device buffer and consume the kinetic energy of the supporting leg and the swivel bridge and reduce the impact load during the abutting process. The over-rotation prevention system used in the method for preventing over-rotation in the construction of the swivel bridge can effectively prevent the over-rotation problem in the construction process of the swivel bridge. By using the buffer material and the buffer device at the collision position, the buffer and the collision force are reduced, and the collision damage of the bridge pier or the supporting leg is prevented. The inclined groove arranged in the track groove is used to prevent the rebound of the movable limiting device, so that the swivel is accurately positioned, and the subsequent fine adjustment time is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge construction methods, and in particular relates to an over-rotation prevention method for the construction of a rotary bridge. Background Art

[0002] Continuous beam rotation construction is typically performed on existing railway bridges. This process typically takes place within a short window, often as short as 30 minutes on busy routes. A major challenge during construction is ensuring that the continuous beam rotation device can effectively connect various processes and rapidly respond to emergencies.

[0003] Patent No. 201710886898.0 describes a novel continuous beam rotation construction boosting and over-rotation prevention device. A foundation is constructed on both sides of the support legs, with the main beam placed in a groove. Jacks are used to push against the support legs to provide boost. A limited main beam is installed at the rotation endpoint, and a limited block is used behind the main beam to abut against a raised portion of the foundation to prevent over-rotation. If over-rotation occurs, the limited main beam can be moved back, and a jack can be added between the main beam and the support legs. The jacks then push back to retract the main beam.

[0004] The aforementioned patent uses a limit beam and a stopper to prevent over-rotation. However, the limit beam must be installed just as the swivel is about to reach its designed position, making it impossible to install it in advance and resulting in low construction efficiency. Furthermore, there is no buffer device at the collision point between the support leg and the limit beam. In the event of a collision, the support leg or the limit beam may be damaged, preventing the limit beam from being fully realized.

[0005] Patent No. 201720586103.X, a bridge rotation anti-overturning and anti-overturning system, uses concrete blocks on the lower pedestal and rubber blocks behind the concrete blocks to cushion the impact between the vertical beams and the concrete blocks, reducing the probability of damage caused by collision.

[0006] The above patent uses simple concrete blocks and rubber blocks to prevent over-rotation. However, due to the composition of the vertical beam and inclined beam structure materials, when the rotating bridge with very large mass rotates, the rigid impact is very large, the buffering effect is poor, and it is easy to be damaged, and it cannot effectively prevent the rotating bridge from over-rotation. Summary of the Invention

[0007] The purpose of the present invention is to solve the above-mentioned problem. The present application provides a method for preventing over-rotation in the construction of a rotating bridge, which specifically includes the following steps:

[0008] S1: When constructing the lower turntable of the concrete, a fixed limiting device is installed at the same time, and a movable limiting device is placed in advance on the annular slideway to cooperate with the fixed limiting device to prevent the support legs fixed on the upper turntable from over-rotating;

[0009] During actual construction, the fixed limiting device is constructed simultaneously with the construction of the concrete lower turntable (ie, the two are constructed simultaneously), and the steel bars of the fixed limiting device are connected to the steel bars of the concrete lower turntable and are prefabricated simultaneously with concrete.

[0010] The movable limiting device is manufactured in advance and placed above the annular slide.

[0011] S2: During the rotation of the upper plate of the rotating body, the movable limiting device is pushed by the supporting legs and rotates along the center of the circular track above the circular slideway;

[0012] S3: When the upper plate of the rotating structure rotates to a predetermined position, the support leg pushes the movable limit device against the fixed limit device, thereby preventing the rotating bridge from over-rotating during construction; at the same time, during the abutment process, the movable limit device and the fixed limit device buffer and consume the kinetic energy of the support leg and the rotating bridge and reduce the impact load.

[0013] On the basis of the above solution, in step S1, track grooves are provided on the inner and outer sides of the annular slideway; and the running wheels provided at the bottom of the movable limiting device 5 are placed in the track grooves in advance.

[0014] Based on the above scheme, in step S2, the movable limiting device is pushed by the support leg and rotates along the center of the circular track above the circular slide. Before the movable limiting device collides with the fixed limiting device, the walking wheel located in front of the rotation direction is lower than the walking wheel at the rear.

[0015] On the basis of the above scheme, in step S3, after the abutment is completed, if the swivel bridge has not been completely rotated into place, precise adjustment is required through a wedge block; specifically, the wedge block is arranged on the side of the outer limit block close to the movable limit device.

[0016] In the anti-over-rotation method for the construction of a rotating bridge of the present application, the stability of the fixed limiting device is ensured by prefabricating a fixed limiting device in advance; at the same time, the kinetic energy of the support legs and the rotating bridge is buffered and consumed and the impact load is reduced by the movable limiting device during the rotation limiting process. At the same time, the anti-over-rotation system used in the method can effectively prevent the over-rotation problem that occurs during the construction of the rotating bridge. By using buffer materials and buffer devices (movable limiting devices) at the collision position, it plays a role in buffering and reducing the collision force, preventing the bridge piers or support legs from being damaged by collision. A slope groove is set in the track groove to prevent the rebound of the movable limiting device, thereby achieving the purpose of precise rotation and saving time for subsequent fine-tuning. This device can accurately control the rotation angle during the continuous beam rotation construction process, has high construction efficiency, meets the requirements of tight construction time, and ensures the stable and reliable progress of the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the concrete lower turntable in the system of this application;

[0018] Figure 2 Schematic diagram of the overall structure of the system of this application (rotation state);

[0019] Figure 3 Schematic diagram of the overall structure of the system of this application (limited state);

[0020] Figure 4 This is a structural diagram of the movable limit device in the system of this application (stereoscopic perspective);

[0021] Figure 5 This is a schematic diagram of the structure of the movable limit device in the system of this application (top view);

[0022] Figure 6 This is a structural diagram of the first elastic drum in the movable limiting device of the system of the present application;

[0023] Figure 7 Schematic diagram of the state before collision during the construction process of the embodiment. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] In the description of this application, it should be noted that the terms "inner," "upper," "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] It should also be noted that, in the description of this application, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0027] Example 1

[0028] like Figure 1-3 As shown, the present application provides an anti-over-rotation system for a rotating bridge, including an annular slide 2 fixed on a concrete lower turntable 1. In actual engineering or some literature patents, the concrete lower turntable 1 is also called a lower pedestal; a PTFE slide plate is laid on the annular slide 2. These are all existing technologies and will not be described in detail here. In addition, the anti-over-rotation system of the present application also includes a fixed limiting device 3 and a movable limiting device 5 used in conjunction with the fixed limiting device 3 to prevent the support legs 4 fixed on the upper plate of the swivel from over-rotation. During the rotation of the upper plate of the swivel, the movable limiting device 5 is pushed by the support legs 4 and rotates along the center of the circular track above the annular slide 2. When limiting, the movable limiting device 5 is pushed by the support legs 4 and rests on the fixed limiting device 3. In other words, the position of the fixed limiting device 3 is pre-installed on the concrete lower turntable 1 according to the construction requirements. The fixed limiting device 3 serves as the basis of the anti-over-rotation system. During actual construction, the fixed limiting device 3 is installed at the same time as the concrete lower turntable 1 is installed (that is, the two are constructed simultaneously), and the steel bars of the fixed limiting device 3 are connected to the steel bars of the concrete lower turntable 1 and are prefabricated simultaneously with concrete. This ensures the stability of the fixed limiting device 3.

[0029] Because the support legs 4 are fixed to the upper plate of the swivel and are made of steel (the support legs 4 are conventional), if the support legs 4 and the fixed stopper 3 (made of reinforced concrete) are used directly to prevent over-rotation, at best, they will collide and damage the fixed stopper 3, or at worst, the swivel bridge above the support legs 4 will tilt or even fall. Therefore, when the support legs abut against the swivel bridge, the movable stopper 5 needs to buffer the kinetic energy of the support legs 4 and the swivel bridge and reduce the impact load.

[0030] There are many limiting devices that can buffer the kinetic energy of the support legs 4 and the rotating bridge during abutment, such as conventional sandboxes and rubber blocks. However, existing devices, due to the large mass of the rotating bridge and the significant rigid impact during rotation, have poor buffering effectiveness and are prone to damage. Because the support legs 4 are cylindrical, using a sandbox for position limiting means that the contact surface between the support legs 4 and the sandbox during abutment is limited. Furthermore, the sandbox cannot be equipped with cushioning materials or other buffering devices, making it difficult to absorb the energy generated by the collision.

[0031] As a specific implementation scheme, Figure 4 As shown, the present application provides a specific structure of a movable limiting device 5. The movable limiting device 5 includes a holding portion 5-1 for holding the support leg 4 and a supporting portion 5-2 for abutting against the fixed limiting device 3 to prevent the support leg 4 from rotating. A plurality of buffers 5-3 are provided between the holding portion 5-1 and the supporting portion 5-2 (specifically, fixed by welding) for buffering and absorbing energy when the support leg 4 pushes the movable limiting device 5 to abut against the fixed limiting device 3.

[0032] Since the collision process is accompanied by energy conversion, the collision time is extremely short when two objects come into contact and collide, resulting in the impact force during the collision being very large relative to the external force. The present application uses the buffer 5-3 on the movable limit device 5 to buffer the energy consumption, thereby extending the collision time and reducing the impact load.

[0033] When the movable limit device 5 with the buffer 5-3 abuts, the buffer 5-3 will buffer and consume 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 known that the movable limiting device 5 of the present application uses 9 buffers. In fact, in order to reduce the impact load and enhance the effect of buffering energy consumption, more buffers can be added.

[0034] There are two optional ways for the holding part 5-1. One is that the holding part 5-1 is directly and tightly held on the support leg 4, that is, the entire movable limiting device 5 is fixedly connected to the support leg 4. This method has certain risks for actual construction, because the movable limiting device 5 itself has a certain weight, and there will be safety hazards when it is held and connected with the support leg 4; in addition to the above method, there is another method that the holding part 5-1 and the support leg 4 are only formally held, and it is not connected to the support leg 4.

[0035] As a specific implementation scheme, Figure 4 As shown, the abutting portion 5-2 includes a abutting plate 5-21 near the fixed limiter 3, a first connecting plate 5-22 near the holding portion 5-1, and abutting portion side plates 5-23 disposed on both sides of the abutting plate 5-21 and the first connecting plate 5-22. The holding portion 5-1 includes a second connecting plate 5-11 near the abutting portion 5-2, a holding plate 5-12 near the support leg 4, and holding portion 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 arc-shaped concave surface near the support leg 4. This allows the second type of holding mentioned above (formal holding) to be achieved. In addition to the holding function, the arc-shaped holding plate 5-12 can also play a certain buffering role. When the support leg 4 pushes the movable limit device 5 to rotate, the support leg 4 is half-surrounded by the arc-shaped holding plate 5-12. When the supporting plate 5-21 hits the fixed limit device 3, the support leg 4 will further compress the movable limit device 5. At this time, the buffer 5-3 will play a buffering role. However, since the support leg 4 directly applies force to the holding plate 5-12, the holding plate 5-12 will drive the holding part side plates 5-13 on both sides to shrink towards the support leg 4. This process will also have a buffering effect on the support leg 4. Figure 4 and 5 As shown, a plurality of holding portion ribs 5-15 perpendicular to the second connecting plate 5-11 are provided between the second connecting plate 5-11 and the holding portion side plate 5-13 of the holding portion 5-1. The provision of the holding portion ribs 5-15 can further enhance the buffering and energy dissipation effect of the holding portion 5-1 on the support leg 4.

[0036] Between the abutment plate 5-21 and the first connecting plate 5-22 are provided a plurality of abutment ribs 5-25 perpendicular to the abutment plate 5-21 to enhance the support strength of the abutment portion 5-2. (The abutment plate 5-21 and the first connecting plate 5-22 are parallel)

[0037] During the specific production, the materials of the abutment plate 5-21, the first connecting plate 5-22, the abutment part side plate 5-23, the abutment part rib plate 5-25, the second connecting plate 5-11, the holding plate 5-12, the holding part side plate 5-13 and the holding part rib plate 5-15 are all steel plates, and the plates are fixed by welding.

[0038] The abutment side plate 5-23 extends to one side of the holding portion 5-1 and is fixedly connected to both sides of the second connecting plate 5-11; this can enhance the integrity between the holding portion 5-1 and the abutment 5-2. In order to further enhance the integrity, the holding portion side plate 5-13, the abutment side plate 5-23 and the abutment plate 5-21 can be an integral steel plate. Although this will increase the difficulty of production, it is nothing for the construction of the rotating bridge.

[0039] Although the movable stopper 5 using the buffer 5-3 can consume the kinetic energy of the slewing bridge (the buffer 5-3 is mainly for reducing the impact load), this consumption requires the use of a large number of buffers 5-3. Therefore, based on the above technical solution, the use of an elastic drum can be increased in the movable stopper 5.

[0040] 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, and the first elastic drum 5-4 includes a first support plate 5-41 and two first elastic plates 5-42 provided on both sides of the first support plate 5-41; both ends of the first elastic plate 5-42 are fixed on the first support plate 5-41, and the middle part protrudes away from the first support plate 5-41; both ends of the first support plate 5-41 are 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 fixedly connected to the holding plate 5-12 and the second connecting plate 5-11 respectively. Moreover, as Figure 5 As shown, the connection between a 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.

[0041] As a more preferred solution, a second elastic drum 5-5 is arranged between the abutment plate 5-21 and the first connecting plate 5-22, and the second elastic drum 5-5 includes a second support plate 5-51 and two second elastic plates 5-52 arranged on both sides of the second support plate 5-51; the two ends of the second elastic plate 5-52 are fixed on the second support plate 5-51, and the middle part protrudes in the 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 figure shows a pattern in which two second elastic drums 5-5 are provided on the abutting portion 5-2, and the connection between a second elastic plate 5-52 of each second elastic drum 5-5 and the first connecting plate 5-22 corresponds to the connection between the buffer 5-3 and the first connecting plate 5-22.

[0042] Specifically, the first support plate 5-41 and the second support plate 5-51 are made of steel plates, and the first elastic plate 5-42 and the second elastic plate 5-52 are made of curved steel plates. Bolts are used to connect the first and second support plates 5-41 and 5-51, respectively, at both ends of the first elastic plate 5-42. This improves the spatial force transmission between the first and second elastic drums 5-4 and 5-5, and the first and second support plates 5-41 and 5-51 can enhance the strength of the elastic drums.

[0043] 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 a collision, thereby absorbing the energy generated by the collision and evenly transmitting the impact force generated by the collision. This fully plays the role of buffering energy consumption, and can cooperate with the buffer 5-3 to enhance the overall buffering energy consumption and the effect of reducing impact loads of the movable limit device 5.

[0044] To prevent damage when the support leg 4 pushes the movable stopper 5 to move and collides with the fixed stopper 3, the holding plate 5-12 of the movable stopper 5 is provided with a first anti-collision layer 5-14 on the side close to the support leg 4, and a second anti-collision layer 5-24 on the side of the abutting plate 5-21 close to the fixed stopper 3. The first and second anti-collision layers 5-14 and 5-24 can be made of thick rubber pads. This provides a certain degree of cushioning in the event of an impact, prolonging the impact time, and preventing the fixed stopper 3 from being damaged by the impact, which could result in the beam body (swivel beam) not being accurately positioned.

[0045] Based on the above solution, if the movable limiting device 5 adopts a formal way to hold the support leg 4, then in order to make it move in a circular motion more smoothly along the annular slide 2, as shown in FIG. Figure 7 As shown, 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. Figure 1 As shown, track grooves 6 for limiting the running tracks of the running wheels 5-6 are provided on both the inner and outer sides of the annular slideway 2. Specifically, the track grooves 6 can be welded using channel steel or steel plates, and the running wheels 5-6 are placed in the track grooves 6, and their running tracks are limited by the track grooves 6.

[0046] Since the abutting portion 5-2 of the movable limiting device 5 spans the annular slide 2 and has a certain width, the fixed limiting device 3 cannot play a good role if it is only arranged on the inner side or the outer side of the annular slide 2. Figure 1 As shown, the fixed limiting device 3 includes an outer limiting block 3 - 1 arranged on the outside of the annular slideway 2 and an inner limiting block 3 - 2 arranged on the inside of the annular slideway 2 .

[0047] Because the fixed limit device 3 is prefabricated on the concrete lower turntable 1 in advance, the designed position may deviate during actual construction. In addition, during the rotation of the swivel bridge, in the final positioning stage, it is necessary to make precise adjustments according to the actual construction conditions. To this end, as a specific implementation scheme, a wedge block 7 for precisely adjusting the distance between the movable limit device 5 and the outer limit block 3-1 is provided on the side of the outer limit block 3-1 close to the movable limit device 5. As an implementable solution, the wedge block 7 is a wooden block. During the rotation of the swivel bridge, when the predetermined rotation position is basically reached, the movable limit device 5 will first abut against the wedge block 7. Due to the material of the wedge block 7, it will consume a certain amount of energy of the movable limit device 5. At the same time, after the movable limit device 5 abuts against the wedge block 7, the rotation position of the swivel bridge can be precisely adjusted by cutting off part of the wedge block 7 according to the actual construction conditions.

[0048] During the rotation of the swivel bridge, when the movable limit device 5 collides with the wedge block 7 or collides with the fixed limit device 3, a reaction force will be generated. The reaction force will be more dangerous in actual construction. In order to solve this technical problem, Figure 7 As shown, on the side where the movable stopper 5 collides with the fixed stopper 3, the track groove 6 is provided with a sloped groove 6-1. The level of the sloped groove 6-1 on the side closest to the fixed stopper 3 is lower than the level on the side further away from the fixed stopper 3. Thus, when the running wheels 5-6 drive the movable stopper 5 to reach the sloped groove 6-1, it will move forward and downward along the sloped groove 6-1. Therefore, when a collision occurs, the reaction force is effectively reduced. To further achieve this effect, the bottom surface of the sloped groove 6-1 is concave and convex.

[0049] Example 2

[0050] Based on the anti-over-rotation system for a rotating bridge in Example 1, the present application provides an anti-over-rotation method for rotating bridge construction, which specifically includes the following steps:

[0051] S1: When constructing the lower turntable 1 of the concrete, a fixed limiting device 3 is installed at the same time, and a movable limiting device 5 is placed in advance on the annular slide 2 to cooperate with the fixed limiting device 3 to prevent the support legs 4 fixed to the upper turntable from over-rotating;

[0052] During actual construction, the fixed limiting device 3 is constructed simultaneously with the construction of the concrete lower turntable 1 (i.e., the two are constructed synchronously), and the steel bars of the fixed limiting device 3 are connected to the steel bars of the concrete lower turntable 1 and are prefabricated simultaneously with concrete.

[0053] The movable limiting device 5 is manufactured in advance and placed above the annular slideway 2 .

[0054] S2: During the rotation of the upper plate of the swivel, the movable limiting device 5 is pushed by the supporting legs 4 and rotates along the center of the circular track above the circular slideway 2;

[0055] S3: When the upper plate of the swivel rotates to a predetermined position, the support leg 4 pushes the movable limit device 5 to abut against the fixed limit device 3, thereby preventing over-rotation during the construction of the swivel bridge; at the same time, during the abutment process, the movable limit device 5 and the fixed limit device 3 buffer and consume the kinetic energy of the support leg 4 and the swivel bridge and reduce the impact load.

[0056] Specifically, in step S1 , track grooves 6 are provided on both inner and outer sides of the annular slideway 2 ; and the running wheels 5 - 6 provided at the bottom of the movable limiting device 5 are placed in the track grooves 6 in advance.

[0057] Specifically, in step S2, the movable limiting device 5 is pushed by the support leg 4 and rotates along the center of the circular track above the circular slide 2. Before the movable limiting device 5 collides with the fixed limiting device 3, the walking wheels 5-6 located in the front of the rotation direction are lower than the walking wheels at the rear.

[0058] Specifically, in step S3, after the abutment is completed, if the swivel bridge has not been completely rotated into place, it needs to be precisely adjusted by the wedge block 7; specifically, the wedge block 7 is set on the side of the outer limit block 3-1 close to the movable limit device 5.

[0059] For details not described in this embodiment, please refer to the contents of Example 1.

[0060] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for preventing over-rotation in the construction of a rotating bridge, characterized in that: The steps include: S1: When constructing the concrete lower turntable (1), a fixed limiting device (3) is simultaneously applied, and a movable limiting device (5) is placed in advance on the annular slideway (2) to cooperate with the fixed limiting device (3) to prevent the support legs (4) fixed on the upper turntable from over-rotating; S2: During the rotation of the upper disc of the rotating body, the movable limiting device (5) is pushed by the supporting legs (4) and rotates along the center of the circular track above the circular slideway (2); S3: When the upper plate of the rotating body rotates to a predetermined position, the support leg (4) pushes the movable limiting device (5) to abut against the fixed limiting device (3), thereby preventing the rotating bridge from over-rotating during construction; at the same time, during the abutting process, the movable limiting device (5) and the fixed limiting device (3) buffer and consume the kinetic energy of the support leg (4) and the rotating bridge and reduce the impact load; In step S1, track grooves (6) are provided on both inner and outer sides of the annular slideway (2); the running wheels (5-6) provided at the bottom of the movable limiting device (5) are placed in the track grooves (6) in advance; In step S2, the movable limiting device (5) is pushed by the support leg (4) and rotates along the center of the circular track above the circular slideway (2). Before the movable limiting device (5) collides with the fixed limiting device (3), the running wheel (5-6) located in the front of the rotation direction is lower than the running wheel at the rear; On the side where the movable limiting device (5) collides with the fixed limiting device (3), the track groove (6) is provided with a slope groove (6-1), and the horizontal height of the slope groove (6-1) on the side close to the fixed limiting device (3) is lower than the horizontal height on the side away from the fixed limiting device (3); In step S3, after the abutment is completed, if the swivel bridge has not been completely rotated into place, it is necessary to perform precise adjustment through the wedge block (7); specifically, the wedge block (7) is set on the side of the outer limit block (3-1) close to the movable limit device (5), and the wedge block (7) is a wooden block. After the movable limit device (5) abuts against the wedge block (7), according to the actual construction situation, by cutting off part of the wedge block (7), the swivel position of the swivel bridge can be precisely adjusted.

2. The over-rotation prevention method for rotating bridge construction according to claim 1 is characterized in that: The movable limiting device (5) comprises a holding portion (5-1) for holding the support leg (4) and a supporting portion (5-2) for supporting 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 portion (5-1) and the supporting portion (5-2) for buffering and consuming energy when the support leg (4) pushes the movable limiting device (5) to support the fixed limiting device (3).

3. The over-rotation prevention method for rotating bridge construction according to claim 2 is characterized in that: The abutting portion (5-2) comprises an abutting plate (5-21) close to the fixed limiting device (3), a first connecting plate (5-22) close to the holding portion (5-1), and abutting portion side plates (5-23) arranged on both sides of the abutting plate (5-21) and the first connecting plate (5-22). The holding portion (5-1) comprises a second connecting plate (5-11) close to the side of the abutting portion (5-2), a holding plate (5-12) close to the side of the support leg (4), and holding portion side plates (5-13) arranged on both sides of the second connecting plate (5-11) and the holding plate (5-12); the holding plate (5-12) is an arc-shaped plate, and the arc-shaped concave surface is close to the support leg (4); The buffer (5-3) is arranged between the first connecting plate (5-22) and the second connecting plate (5-11).

4. The over-rotation prevention method for rotating bridge construction according to claim 3 is characterized in that: A first elastic drum (5-4) is provided between the second connecting plate (5-11) and the holding plate (5-12), and the first elastic drum (5-4) comprises a first support plate (5-41) and two first elastic plates (5-42) provided on two side surfaces of the first support plate (5-41); the first elastic plate (5-42) has two ends fixed to the first support plate (5-41), and the middle portion 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 portion side plates (5-13) of the holding portion (5-1); and 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).

5. The over-rotation prevention method for rotating bridge construction according to claim 3 is characterized in that: A second elastic drum (5-5) is provided between the abutting plate (5-21) and the first connecting plate (5-22), and the second elastic drum (5-5) comprises a second supporting plate (5-51) and two second elastic plates (5-52) provided on two side surfaces of the second supporting plate (5-51); both ends of the second elastic plate (5-52) are fixed to the second supporting plate (5-51), and the middle portion thereof protrudes in a direction away from the second supporting plate (5-51); and the maximum protrusions of the two second elastic plates (5-52) of the second elastic drum (5-5) are fixedly connected to the abutting plate (5-21) and the first connecting plate (5-22), respectively.

6. The over-rotation prevention method for rotating bridge construction according to claim 1, characterized in that: The fixed limiting device (3) comprises an outer limiting block (3-1) arranged on the outside of the annular slideway (2) and an inner limiting block (3-2) arranged on the inside of the annular slideway (2). In step S3, during the abutment process, the movable limiting device (5) abuts against the outer limiting block (3-1) and the inner limiting block (3-2) simultaneously.

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