Swivel support with eccentric structure and manufacturing method and application of swivel support

Abstract

The invention belongs to swivel bridge construction, and particularly relates to a swivel support with an eccentric structure and a manufacturing method and application of the swivel support. The support comprises an upper seat plate, the edge of the upper seat plate is provided with an anchoring assembly which can be fixed with the upper turntable, the upper seat plate is coaxially assembled with the center of a lower seat plate arranged below the upper seat plate, and the adjacent parts of the upper seat plate and the lower seat plate form a spherical hinge; an air hole is formed in the embedded steel plate, and the lower seat plate is in running fit with a first pin shaft which is longitudinally arranged on the upper surface of the embedded steel plate through an eccentric hole in the lower part of the lower seat plate; the distance between the second pin shaft and the first pin shaft is matched with the designed eccentric distance formed by the gravity center and the geometric center of a swivel bridge design structure, and a connecting mechanism capable of fixing the upper seat plate and the lower seat plate is arranged between the upper seat plate and the lower seat plate. The problems that in the prior art, a swivel bridge of an asymmetric structure is large in counterweight, so that the cross section stress of a beam body is large, and cracking is prone to occurring are effectively solved; and the device has the advantages of small swivel operation counterweight, low cost, high efficiency and the like.

Description

Technical Field

[0001] The invention relates to the construction of a rotating bridge, and in particular to a rotating support with an eccentric structure and a manufacturing method and application thereof. Background Art

[0002] With the construction of high-speed railways and highways, a large number of large bridges crossing rivers and railways have emerged. Due to the constraints of construction environment and traffic factors, the use of rotation method can better avoid the impact on other lines of transportation, so the rotation method construction has been unprecedentedly developed.

[0003] As the core component of the bridge rotation system, the central rotation bearing plays a vital role in the bridge rotation process. With the continuous improvement of my country's transportation design capabilities, the structural forms and spans of rotating bridges are also diverse. Some rotating bridges have different eccentricities due to curves or structural asymmetry. When the asymmetric structure is large, it is necessary to add a large counterweight to the beam. The rotation operation can only be carried out after the counterweights on both sides of the rotating structure reach balance. Because rotating bridges are all cantilever structures, when the counterweight is large, on the one hand, it will increase the stress on the cross-section of the beam and increase the deflection of the beam, which may cause deformation or even cracking of the beam, reduce the safety of the rotating bridge, and increase the risk of rotation. On the other hand, when the counterweight is large, more manpower and material resources are required, which increases the cost of the counterweight, increases the construction period of the counterweight, and reduces work efficiency.

[0004] Based on the above reasons, there is a need for a method that can adjust the eccentricity of the rotating bridge through a rotating support when the rotating bridge has curves or asymmetry, and effectively reduce the counterweight to facilitate later weighing, counterweight and construction needs, thereby improving the safety of the rotating bridge.

[0005] The applicant has not found any patent document report identical or similar to the present invention in the domestic patent database. Summary of the invention

[0006] The purpose of the present invention is to provide a swivel bearing with an eccentric structure and a manufacturing method and application thereof, which can effectively reduce the counterweight and operating costs in the construction of a swivel bridge, reduce the risk of beam deformation, and improve the work efficiency of the swivel bridge construction.

[0007] The overall technical concept of the present invention is:

[0008] A swivel support with an eccentric structure includes an upper seat plate, an edge of which is provided with an anchoring assembly that can be fixed to the upper turntable, the center of the upper seat plate and the center of the lower seat plate arranged thereunder are longitudinally coaxially assembled through a second pin shaft, and the adjacent parts of the upper seat plate and the lower seat plate form a ball joint; it also includes an embedded steel plate that can be anchored to the lower pedestal through a pad stone, and the embedded steel plate is provided with air holes for exhaust and / or concrete vibration. The lower seat plate is rotatably matched with a first pin shaft longitudinally arranged on the upper surface of the embedded steel plate through an eccentric hole at its lower part, and the spacing between the second pin shaft and the first pin shaft is adapted to the designed eccentricity of the swivel bridge. The designed eccentricity of the swivel bridge is the spacing between the center of gravity of the designed structure of the swivel bridge and its geometric center, and a connecting mechanism that can fix the two is provided between the lower seat plate and the upper seat plate.

[0009] A method for manufacturing a swivel support with an eccentric structure comprises the following steps:

[0010] A. The design structural center of gravity and its geometric center of the rotating bridge are calculated by data modeling method. The distance between the design structural center of gravity and its geometric center is the design eccentricity of the rotating bridge;

[0011] B. According to the method of matching the distance between the second pin shaft and the first pin shaft with the designed eccentric distance of the rotating bridge, the position of the first pin shaft and the eccentric hole matching with the first pin shaft are obtained;

[0012] C. Determine the position of the first pin and the eccentric hole according to step B, make a lower seat plate and form an eccentric hole at its lower portion; make an embedded steel plate and form the first pin on its upper surface; make an upper seat plate and an anchor assembly.

[0013] The applicant needs to explain that the main function of the pores is to make the concrete under the embedded steel plate more compact through the action of the vibrator, avoid the void between the embedded steel plate and the cushion stone, and thus achieve uniform force and firm anchoring. Since the plane slide plate, plane sealing ring, spherical slide plate, and spherical sealing ring are conventional components in this field, it is something that those skilled in the art should know and understand to assemble the plane slide plate and spherical slide plate through the working medium, and the applicant will not elaborate on the manufacturing method of the above-mentioned parts and the assembly process with adjacent parts.

[0014] Application of swivel bearing with eccentric structure in swivel bridge construction.

[0015] The specific technical concept of the present invention also includes:

[0016] In order to facilitate flexible cooperation between the embedded steel plate and the lower seat plate, the preferred technical implementation method is that the adjacent surfaces of the embedded steel plate and the lower seat plate are provided with a friction pair consisting of a stainless steel plate, a flat slide plate and a working medium for lubrication, wherein the flat slide plate is made of materials including but not limited to modified polytetrafluoroethylene or similar materials, and the working medium includes but is not limited to silicone grease or similar materials.

[0017] A more preferred technical implementation means is that a flat sealing ring is provided on the outer side of the friction pair composed of the stainless steel plate and the flat sliding plate to prevent impurities from entering the sliding surface.

[0018] In order to facilitate the flexible rotation between the upper seat plate and the lower seat plate, the preferred technical implementation method is that the adjacent surfaces of the upper seat plate and the lower seat plate are provided with a spherical slide plate and a working medium for lubrication, wherein the spherical slide plate is made of materials including but not limited to modified polytetrafluoroethylene or similar materials, and the working medium includes but is not limited to silicone grease or similar materials.

[0019] A more preferred technical implementation means is that a spherical sealing ring is provided on the outer side of the spherical sliding plate to prevent impurities from entering the sliding surface.

[0020] In order to facilitate the manufacture of the embedded steel plate, enhance its strength and load capacity, and facilitate more reliable anchoring with the pad stone, the preferred technical implementation method is that the embedded steel plate includes a flat steel plate and a rib fixed to the lower surface of the flat steel plate.

[0021] Because the main function of the connecting mechanism is to facilitate the fixation of the lower seat plate and the upper seat plate after weighing and counterweighting, so as to make the swivel support as a whole rotate around the first pin shaft of the embedded steel plate, and to avoid the vertical rotation of the beam structure during rotation, when the rotation operation of the swivel bridge is completed, it can be disassembled to facilitate the posture adjustment of the swivel bridge. Therefore, the preferred technical implementation method is that the connecting mechanism adopts a detachable connection.

[0022] A more preferred technical implementation means is that the connection mechanism can adopt a variety of common mechanical connection methods, including but not limited to bolts, locking pins, welding or a combination thereof.

[0023] The first pin shaft and the embedded steel plate preferably have the following structural form: the first pin shaft and the upper surface of the embedded steel plate are fixed by welding or formed into an integral whole.

[0024] The application of the rotating bearing with an eccentric structure in the construction of the rotating bridge includes the following steps:

[0025] Ⅰ. After the first pouring of the lower cap is completed, the slideway is positioned and installed and leveled;

[0026] Ⅱ. After the slideway is installed, the lower cap is poured for the second time;

[0027] III. After the secondary pouring of the lower cap is completed and reaches the design strength, the rotation center position of the rotating bridge is obtained by measuring and laying out the lines using the measuring instrument, the embedded steel plate is installed and the axis of the first pin coincides with the rotation center, and the cushion stone is poured after the embedded steel plate is installed;

[0028] IV. Hoist the eccentric bearing to the embedded steel plate and match the eccentric hole of the lower seat plate with the first pin of the embedded steel plate. The gravity center and geometric center of the design structure of the rotating bridge calculated by the data modeling method are used to obtain the gravity center position of the design structure through the relationship between the gravity center of the design structure of the rotating bridge and its geometric center. The eccentric bearing is installed and adjusted so that the center of the second pin coincides with the gravity center of the design structure of the rotating bridge;

[0029] V. Install the sand box and place the support legs above the slideway, cast the upper structure of the rotating bridge, and fix the upper seat plate and the upper turntable at the bottom of the beam body through the anchor assembly;

[0030] VI. After the rotation conditions are met, the beams on both sides of the rotating bridge are weighed and counterweighted. After the counterweight is completed, the lower seat plate and the upper seat plate are fixed through the connecting mechanism, and the rotation operation of the rotating bridge begins.

[0031] Since the bearing in the present invention mainly involves the improvement of the process steps before symmetrical weighing and counterweighting when applied to the construction of a rotating bridge, the measurement of the rotation center in steps I, II and III before weighing and counterweighting, the center of gravity of the design structure of the rotating bridge and its geometric center calculated by the data modeling method in step IV, the measurement and laying out of the design structure by measuring instruments in step IV, and the method involved in step V are necessary process steps to complete the present invention, but they are what those skilled in the art should know and are familiar with and are often reported in the existing literature; after weighing and counterweighting, the lower seat plate and the upper seat plate are fixed by a connecting mechanism, and the completed rotating operation of the rotating bridge is a conventional operation; the steel wire rope, winch and other structures required for the rotating bearing with an eccentric structure during the rotation operation are conventional construction methods, which are often seen in existing literature and engineering practice, and are what those skilled in the art should know and are familiar with, and the applicant will not elaborate on them here.

[0032] The applicant needs to state:

[0033] In the description of the present invention, the orientations or positional relationships indicated by terms such as "lower part", "upper surface", "outside", "lower surface", "bottom", "both sides", etc. are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description of the present invention. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] The substantial features and significant technical advances of the present invention are:

[0035] 1. When the rotating bridge is in a state of unbalanced mass on both sides, the eccentricity of the structure can be adjusted through the support. The eccentricity is preset on the support during production and manufacturing to make the center of the support spherical surface and the center of gravity of the structure collinear. First, the unbalanced moment caused by the asymmetric structural design is eliminated according to the design requirements, which is convenient for weighing while reducing the supporting force of the support legs and improving the safety of the rotation process; second, the rotation center is used as the axis during rotation to ensure the accurate rotation position of the rotating bridge.

[0036] 2. The present invention adjusts the eccentricity of the support according to the eccentricity of the beam structure to eliminate the unbalanced moment caused by the beam structure design. First, the weight required for counterweight after weighing and the resulting production and construction costs are greatly reduced; second, the cross-sectional stress of the beam in the cantilever state is reduced, reducing the risk of cracking of the beam due to excessive counterweight, thereby improving the safety of the rotating bridge; third, the rotation construction period is effectively shortened.

[0037] 3. The rotating surface of the swivel support structure is a plane when rotating. First, it makes it easier to control the processing accuracy of parts and components, which can effectively avoid the problem of excessive local stress of the slide plate caused by spherical surface processing errors; second, using the plane between the embedded steel plate and the lower seat plate as the rotating surface can greatly reduce the vertical rotation angle during rotation, reduce the supporting force of the support legs, and improve the safety of the rotation operation.

[0038] 4. The swivel support has a simple structure, and the lower load-bearing component, i.e., the embedded steel plate, is embedded in the lower pedestal. The technical solution of the present invention is adopted to facilitate installation, and the concrete under the embedded plate is vibrated through the air holes opened on the embedded plate during the pouring process, which can ensure that the concrete under the embedded plate is dense and improve the bearing safety of the swivel support. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings of the present invention include:

[0040] Figure 1 It is a schematic diagram of the assembly structure of the swivel support with an eccentric structure and the lower support platform in the present invention.

[0041] Figure 2 The invention is a schematic diagram of an eccentric swivel structure in which an upper seat plate and a lower seat plate are locked by a connecting mechanism.

[0042] Figure 2A yes Figure 2 A partial enlarged view of part A.

[0043] Figure 2B yes Figure 2 A partial enlarged view of part B.

[0044] Figure 3 It is a structural schematic diagram of the embedded steel plate.

[0045] Figure 4 yes Figure 3 Bottom view of .

[0046] Figure 5 It is a schematic diagram of the coordination structure of a swivel support with an eccentric structure, a lower bearing platform and an upper turntable.

[0047] Figure 6 It is a schematic diagram of the application principle of the design eccentricity of a swivel bearing with an eccentric structure.

[0048] Figure 7 It is a schematic diagram of the changes of the swivel support with an eccentric structure before and after the rotation.

[0049] Figure 8 It is a schematic diagram of the working principle of the swivel support with an eccentric structure in the present invention when the masses of swivels on both sides are unequal.

[0050] Fig. 9 It is a schematic diagram of the arrangement structure of the support legs, slideway, lower support platform and eccentric support in the present invention.

[0051] Fig.10 It is a top view of the arrangement structure of the support legs, sand box and eccentric support in the present invention.

[0052] The reference numerals in the accompanying drawings are as follows:

[0053] 1. Embedded steel plate; 1A. Flat steel plate; 1B. Rib plate; 2. First pin shaft; 3. Second pin shaft; 4. Stainless steel plate; 5. Flat slide plate; 6. Lower seat plate; 7. Flat sealing ring; 8. Spherical slide plate; 9. Spherical sealing ring; 10. Upper seat plate; 11. Anchor assembly; 12. Connecting mechanism. DETAILED DESCRIPTION

[0054] The accompanying drawings show embodiments of the present invention. The embodiments of the present invention are further described below in conjunction with the accompanying drawings, but should not be construed as limiting the present invention. The protection scope of the present invention shall be based on the content of the claims, and any replacement of equivalent technical means made according to the specification shall not depart from the protection scope of the present invention.

[0055] Example

[0056] The overall structure of the present invention is shown in the figure. The swivel support with an eccentric structure includes an upper seat plate 10. The edge of the upper seat plate 10 is provided with an anchor assembly 11 that can be fixed to the upper turntable. The center of the upper seat plate 10 and the center of the lower seat plate 6 arranged below it are longitudinally coaxially assembled through the second pin shaft 3. The adjacent part of the upper seat plate 10 and the lower seat plate 6 forms a ball joint; it also includes an embedded steel plate 1 that can be anchored to the lower pedestal through a pad stone, see Figure 1 , 5 , 6, 9; the embedded steel plate 1 comprises a flat steel plate 1A, a rib plate 1B fixed to the lower surface of the flat steel plate 1A, and air holes for exhaust and / or concrete vibration are provided on the embedded steel plate 1, see Figure 3, 4 The lower seat plate 6 is rotatably matched with the first pin shaft 2 longitudinally arranged on the upper surface of the embedded steel plate 1 through the eccentric hole at the lower part thereof. The first pin shaft 2 and the upper surface of the embedded steel plate 1 are fixed by welding or integrally formed. The axial distance between the second pin shaft 3 and the first pin shaft 2 is adapted to the designed eccentric distance of the swivel bridge. The designed eccentric distance of the swivel bridge is the distance between the center of gravity of the designed structure of the swivel bridge and its geometric center. A connecting mechanism 12 for fixing the two is provided between the lower seat plate 6 and the upper seat plate 10, see Figure 1 , 2 , 5~10.

[0057] A method for manufacturing a swivel support with an eccentric structure comprises the following steps:

[0058] A. The design structural center of gravity and its geometric center of the rotating bridge are calculated by data modeling method. The distance between the design structural center of gravity and its geometric center is the design eccentricity of the rotating bridge;

[0059] B. According to the method of matching the distance between the second pin shaft 3 and the first pin shaft 2 with the designed eccentric distance of the rotating bridge, the position of the first pin shaft 2 and the eccentric hole matched therewith are obtained;

[0060] C. Determine the positions of the first pin shaft 2 and the eccentric hole according to step B, make the lower seat plate 6 and form the eccentric hole at its lower part; make the embedded steel plate 1 and form the first pin shaft 2 on its upper surface; make the upper seat plate 10 and the anchor assembly 11.

[0061] The adjacent surfaces of the embedded steel plate 1 and the lower seat plate 6 are provided with a friction pair consisting of a stainless steel plate 4, a flat slide plate 5 and a working medium for lubrication, wherein the flat slide plate 5 is made of modified polytetrafluoroethylene or similar materials, and the working medium is made of silicone grease or similar materials.

[0062] A flat sealing ring 7 is arranged on the outer side of the friction pair composed of the stainless steel plate 4 and the flat slide plate 5 to prevent impurities from entering the sliding surface.

[0063] The adjacent surfaces of the upper seat plate 10 and the lower seat plate 6 are provided with a spherical slide plate 8 and a working medium for lubrication, wherein the spherical slide plate is made of modified polytetrafluoroethylene or similar materials, and the working medium is made of silicone grease or similar materials.

[0064] A spherical sealing ring 9 is provided on the outer side of the spherical sliding plate 8 to prevent impurities from entering the sliding surface.

[0065] The connection mechanism 12 is connected by bolts.

[0066] The first pin shaft 2 and the upper surface of the embedded steel plate 1 are fixed by welding or formed into an integral whole.

[0067] The application of the rotating bearing with an eccentric structure in the construction of the rotating bridge includes the following steps:

[0068] Ⅰ. After the first pouring of the lower cap is completed, the slideway is positioned and installed and leveled;

[0069] Ⅱ. After the slideway is installed, the lower cap is poured for the second time;

[0070] III. After the secondary pouring of the lower cap is completed and reaches the design strength, the rotation center position of the rotating bridge is obtained by measuring and laying out according to the measuring instrument, and the embedded steel plate 1 is installed so that the axis of the first pin shaft 2 coincides with the rotation center. After the embedded steel plate 1 is installed, the cushion stone is poured;

[0071] IV. Hoist the eccentric support onto the embedded steel plate 1 and match the eccentric hole of the lower seat plate 6 with the first pin 2 of the embedded steel plate 1. The gravity center and geometric center of the design structure of the rotating bridge calculated by the data modeling method are used to obtain the gravity center position of the design structure through the relationship between the gravity center of the design structure of the rotating bridge and its geometric center. The eccentric support is installed and adjusted so that the center of the second pin 3 coincides with the gravity center of the design structure of the rotating bridge. Figures 1-2 , 5-10;

[0072] V. Install the sand box and set the support legs above the slideway, cast the upper structure of the rotating bridge, and fix the upper seat plate 10 to the upper turntable through the anchor assembly 11, such as Figure 5 , Figure 6 , Fig.10 As shown;

[0073] VI. After the rotation conditions are met, the beams on both sides of the rotating bridge are weighed and counterweighted. After the counterweighting is completed, the lower seat plate 6 and the upper seat plate 10 are fixed by the connecting mechanism 12, and the rotation operation of the rotating bridge is started.

[0074] Since the quality evaluation system and relevant standards and specifications for the operation of rotating bridges have not yet been established, in order to compare the technical effect differences between the eccentric bearings in the present invention and the existing rotating bearings, the applicant designed and completed the following tests:

[0075] 1. Test site: Hebei Baoli Engineering Equipment Co., Ltd.

[0076] 2. Experimental personnel: Liu Kai, Li Hongling, Han Qiang, Li Jiatong

[0077] 3. Test time: May 16, 2024

[0078] 4. Test instruments: asymmetric swivel bridge for test, swivel support with eccentric structure in the present invention (hereinafter referred to as eccentric support), common swivel support, jack, dial indicator, counterweight, etc.

[0079] V. Test steps:

[0080] 1. Model analysis. According to the drawings, the left span of the beam is 10 meters long and the right span is 15 meters long. Computer modeling is used to obtain the position of the beam design structure center of gravity and its geometric center. According to the measurement, the distance between the beam design structure center of gravity and the geometric center is 30 cm, that is, the design eccentric distance is 30 cm.

[0081] 2. Process the eccentric support. When processing the lower seat plate, first process the spherical surface, then use the center of the spherical surface as the reference, offset 30cm from the center line of the plane, find the center position of the first pin, and process the pin hole. Process the various parts of the eccentric support in turn. After the eccentric support is processed, it is ready for installation.

[0082] 3. Measure and lay out the lines using the measuring instrument to obtain the rotation center position of the rotating bridge, install the embedded steel plate and make the axis of the first pin coincide with the rotation center. After the embedded steel plate is installed, pour the pad stone.

[0083] 4. Install the eccentric bearing. Hoist the eccentric bearing to the embedded steel plate and match the eccentric hole of the lower seat plate with the first pin of the embedded steel plate. The center of the sphere should fall on the right span of the beam. Because the geometric center is collinear with the center of the first pin, and the center position of the first pin is fixed, the center of gravity of the design structure of the rotating bridge and its geometric center position relationship calculated by the data modeling method are used to measure and lay out the line to obtain the center of gravity of the design structure. The eccentric bearing is installed and adjusted so that the center of the second pin coincides with the center of gravity of the design structure of the rotating bridge.

[0084] 5. Weighing and counterweighting. Since the eccentric bearing is weighed by the spherical slide, and the center of the sphere is the center of gravity of the designed structure, although the actual construction difference will lead to the asymmetry of the two sides of the center of gravity of the designed structure, the difference is significantly smaller than the asymmetry of the structure on both sides of the rotation center. The on-site weighing results show that only 5 tons of counterweight is needed on the top of the left span beam, and the weighing and counterweighting process can be completed in just half a day.

[0085] 6. Replace the ordinary swivel support and weigh and counterweight. Remove the eccentric support in the present invention and install the ordinary swivel support. After installation, weigh and counterweight again. After the left beam top is counterweighted by 20 tons, the swivel bridge reaches a balanced state. The weighing and counterweighting time is 1 day.

[0086] 7. Compare and analyze the weighing and balancing results, weighing and balancing period, etc. of the ordinary swivel bearing and the eccentric bearing in the present invention.

[0087] 6. Comparative analysis of test results:

[0088] By comparing the weight of eccentric bearings and ordinary bearings, the data is as follows:

[0089] Test data table

[0090] Eccentric bearing Ordinary support Counterweight weight (tons) 5 20 Weighting time (days) 0.5 1

[0091] Through the above test data, it is known that the eccentric bearings in the present invention can save 75% of the counterweight, shorten the construction period by 50%, and greatly reduce the construction cost of the counterweight compared to ordinary swivel bearings. The eccentric bearings in the present invention can effectively improve the problems of large stress and easy cracking in the cross section of the beam caused by the large counterweight of the asymmetric swivel bridge, thereby improving the safety of the swivel operation.

Claims

1. A swivel support with an eccentric structure, comprising an upper seat plate (10), the edge of which is provided with an anchoring assembly (11) that can be fixed to an upper turntable, the center of the upper seat plate (10) and the center of the lower seat plate (6) arranged therebelow are longitudinally coaxially assembled via a second pin shaft (3), and the adjacent portions of the upper seat plate (10) and the lower seat plate (6) form a ball joint; characterized in that It also includes an embedded steel plate (1) that can be anchored to the lower pedestal through a cushion stone, the embedded steel plate (1) is provided with air holes for exhaust and / or concrete vibration, the lower seat plate (6) is rotatably matched with a first pin shaft (2) arranged longitudinally on the upper surface of the embedded steel plate (1) through an eccentric hole at its lower portion, the axial distance between the second pin shaft (3) and the first pin shaft (2) is adapted to the designed eccentric distance of the rotating bridge, the designed eccentric distance of the rotating bridge is the distance between the designed structural center of gravity of the rotating bridge and its geometric center, and a connecting mechanism (12) is provided between the lower seat plate (6) and the upper seat plate (10) for fixing the two.

2. The swivel support with an eccentric structure according to claim 1, characterized in that The adjacent surfaces of the embedded steel plate (1) and the lower seat plate (6) are provided with a friction pair consisting of a stainless steel plate (4), a flat slide plate (5) and a working medium for lubrication.

3. The swivel support with an eccentric structure according to claim 1, characterized in that A plane sealing ring (7) is provided on the outer side of the plane slide plate (5) to prevent impurities from entering the sliding surface.

4. The swivel support with an eccentric structure according to claim 1, characterized in that The adjacent surfaces of the upper seat plate (10) and the lower seat plate (6) are provided with a spherical slide plate (8) and a working medium for lubrication.

5. The swivel support with an eccentric structure according to claim 4, characterized in that A spherical sealing ring (9) is provided on the outer side of the spherical sliding plate (8) to prevent impurities from entering the sliding surface.

6. The swivel support with an eccentric structure according to any one of claims 1 to 3, characterized in that The embedded steel plate (1) comprises a flat steel plate (1A) and a rib plate (1B) fixed to the lower surface of the flat steel plate (1A).

7. The swivel support with an eccentric structure according to claim 1, characterized in that The connecting mechanism adopts a detachable connection.

8. The swivel support with an eccentric structure according to claim 1 or 7, characterized in that The connecting mechanism (12) adopts one of bolts, locking pins, welding or a combination thereof.

9. The method for manufacturing a rotating support with an eccentric structure according to any one of claims 1 to 8, characterized in that The steps include: A. The design structural center of gravity and its geometric center of the rotating bridge are calculated by data modeling method. The distance between the design structural center of gravity and its geometric center is the design eccentricity of the rotating bridge; B. According to a method for matching the axial distance between the second pin shaft (3) and the first pin shaft (2) with the designed eccentric distance of the rotating bridge, the position of the first pin shaft (2) and the eccentric hole matched therewith are obtained; C. Determine the positions of the first pin shaft (2) and the eccentric hole according to step B, manufacture the lower seat plate (6) and form the eccentric hole at its lower portion; manufacture the embedded steel plate (1) and form the first pin shaft (2) on its upper surface; manufacture the upper seat plate (10) and the anchor assembly (11).

10. The method for manufacturing a rotating support with an eccentric structure according to claim 9, characterized in that The first pin shaft (2) and the upper surface of the embedded steel plate (1) are fixed by welding or integrally formed.

11. Use of the swivel bearing with an eccentric structure according to any one of claims 1 to 8 in the construction of a swivel bridge.

12. The use according to claim 11, characterized in that The steps include: Ⅰ. After the first pouring of the lower cap is completed, the slideway is positioned and installed and leveled; Ⅱ. After the slideway is installed, the lower cap is poured for the second time; III. After the secondary pouring of the lower pedestal is completed and reaches the designed strength, the rotation center position of the rotating bridge is obtained by measuring and laying out using a measuring instrument, the embedded steel plate (1) is installed and the axis of the first pin shaft (2) is made to coincide with the rotation center, and the cushion stone is poured after the embedded steel plate (1) is installed; IV. Hoist the eccentric bearing onto the embedded steel plate (1) and match the eccentric hole of the lower seat plate (6) with the first pin shaft (2) of the embedded steel plate (1). The gravity center and the geometric center of the design structure of the rotating bridge are calculated using the data modeling method. The gravity center position of the design structure is obtained by measuring and laying out the relationship between the gravity center and the geometric center of the design structure of the rotating bridge using a measuring instrument. The eccentric bearing is installed and adjusted so that the center of the second pin shaft (3) coincides with the gravity center of the design structure of the rotating bridge. V. Install the sand box and place the support legs above the slideway, cast the upper structure of the rotating bridge, and fix the upper seat plate (10) and the upper turntable by means of an anchoring assembly (11); VI. After the rotation conditions are met, the beams on both sides of the rotating bridge are weighed and counterweighted. After the counterweighting is completed, the lower seat plate (6) and the upper seat plate (10) are fixed by the connecting mechanism (12), and the rotating operation of the rotating bridge begins.

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