Bridge swivel system

Abstract

The invention provides a bridge swivel system, which is characterized in that a lower turntable and an upper turntable are arranged below a main beam, the lower turntable is arranged around the periphery of a pier column, the upper turntable is arranged on the lower turntable and can rotate on the lower turntable relative to the lower turntable, and the upper turntable is provided with a plurality of supporting legs; the bottoms of the supporting legs are fixed to the upper rotating disc, and the top faces of the supporting legs are used for supporting a bottom plate of a main beam. In the invention, the supporting legs fixed on the upper turntable directly bear the gravity on the main beam, and the swivel system does not damage the main body structure of the main beam, does not need to use a pier stud, and directly drives the main beam to swivel after the pier stud and the main beam are disconnected, so that the original stress distribution of the main beam is kept to the maximum extent; therefore, the main beams of the old bridge and the dangerous bridge are prevented from generating potential safety hazards due to stress change in the subsequent straight turning process, the rapid and safe turning of the bridge body can be realized, the cutoff time is shortened, and the influence on the existing traffic is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of methods or equipment specifically used for erecting or assembling bridges, and in particular to a bridge rotation system. Background Art

[0002] A cable-stayed bridge is a bridge that uses a number of cables to pull the beam onto the tower. It consists of three parts: beam, cable and tower. A cable-stayed bridge is a self-anchored system, and the horizontal force of the cable is borne by the beam. In addition to being supported on the piers, the beam is also supported on the cable drawn from the tower.

[0003] In order to enable bridge construction to overcome the constraints of terrain, traffic, environment and other conditions, reduce the impact on the environment and road traffic, save engineering costs, shorten the construction period, and ensure the safety and reliability of the construction process, the current bridge construction often uses the rotation method. The rotation method has become an important method in bridge construction. In addition to cable-stayed bridges, the rotation method can also solve the problem of dismantling T-frame bridges such as continuous beam bridges and rigid frame bridges that do not interrupt traffic.

[0004] In recent years, there have been more renovation, expansion, demolition and reconstruction projects. Many of these projects involve the demolition of T-frame bridges such as continuous beam bridges, rigid frame bridges or cable-stayed bridges. In addition, the demolition plans for old and dangerous bridges also need to take their own characteristics into consideration. Some old and dangerous bridges are bridges that are severely damaged and cannot be used normally. The bearing strength of their bridge decks is low, and the bearing structure is uncertain, making it difficult to determine the center of gravity and load-bearing points of the bridge deck. At present, there are three main bridge demolition plans:

[0005] 1. The support method can be used on land and in water. By setting up a steel pipe full-bridge support at the bottom of the beam, the main beam's deadweight falls on the support, and the main beam is cut in sections on the support to realize T-structure dismantling. When the support method is used for dismantling, the bottom of the steel pipe needs to be supported on the ground or riverbed, occupying the space under the bridge, which continuously affects the normal passage of vehicles and ships. When the support is set up in the water, the area water resistance ratio increases, slowing down the water flow speed, causing waterlogging, and affecting the flood discharge capacity;

[0006] 2. The bridge crane method uses a bridge crane to pre-lift a certain amount of deadweight of the beam segment to be dismantled. After the beam segment is cut, the bridge crane lowers the beam segment to a ground transport vehicle or a water transport ship to realize the T-structure dismantling. The traditional bridge crane dismantling solution is mature in technology. When dismantling by the bridge crane method, the lowering of the beam segment requires a phased and temporary interruption of traffic. The front fulcrum of the bridge crane has a large concentrated force, and the corresponding beam segment strength requirement is high. There are great safety hazards for dangerous bridges. In addition, there are many sections within the waterway that need to be dismantled, and there are many temporary closures. The dismantling of the bridge crane is continuous, and the dismantling cycle is long. The front fulcrum of the bridge crane is under great force, and the strength requirement of the main beam of the bridge body is high. For dangerous bridges, the main beam needs to be strengthened before dismantling. Moreover, the load-bearing structure of the dangerous bridge itself is uncertain, and the strengthening point is difficult to determine. If the strengthening range is expanded, the cost will increase significantly;

[0007] 3. The floating crane method is suitable for use in water. The floating crane pre-lifts a certain amount of deadweight of the beam segment to be dismantled. After the beam segment is cut, the floating crane lowers the beam segment to the transport ship to realize the T-structure dismantling. The large-segment dismantling method of the ship is adopted. Although the dismantling speed is fast, the waterway needs to be interrupted during the dismantling period, and the single closure time is long. If the flat tide time in the water area is short, the rising and falling tides require high real-time leveling of the ship and the engine. The process is cumbersome, the connection requirements are high, the control is difficult, and the risk is high;

[0008] 4. In addition, both the floating crane method and the bridge crane method are continuous, and the beam sections must be removed in sequence. During the removal process, the subsequent beam sections to be removed are subjected to complex forces and need to be continuously monitored. For cable-stayed bridges, the cable force needs to be repeatedly adjusted to ensure the safety of the subsequent beam sections to be removed, and the removal process lasts for a long time;

[0009] 5. Use the rotation method for demolition. For old bridges and dangerous bridges, the main beam bears a large concentrated load, and because the bearing structure and stress points of the main beam are uncertain, the stress points of the main beam are not easy to change, and the currently commonly used rotation scheme is not applicable.

[0010] In response to the above problems, the applicant previously proposed a cable-stayed bridge rotation system (CN117867997A), in which it is proposed that: a rotation structure is provided on the top surface of the pedestal, the rotation structure is arranged around the outer circle of the pier, at least one pair of supporting feet is provided on the rotation structure, the pair of supporting feet are symmetrically arranged facing each other, the bottom of the supporting feet is fixed on the rotation structure and can rotate with the rotation structure, the supporting feet are fixedly connected to the pier, and the pier and the pedestal are in a disconnected state before rotation, the rotation structure can drive the supporting feet, the pier and the main beam to rotate, at this time, the gravity of the main beam changes from the original main beam-pier-pedestal to main beam-pier-supporting feet-pedestal.

[0011] The applicant found in multiple tests that the above solution has the following technical problems:

[0012] 1. The existing old bridge's abutment range may not be sufficient to set up a support foot and swivel system with a circular rotation trajectory;

[0013] 2. The support foot and the pier column are fixedly connected. During implementation, the support foot and the pier column are fixedly connected by numerous anchor bars, which may even be as many as thousands. However, due to the uncertainty of the bearing structure and stress points of the pier columns of old and dangerous bridges, the pier columns may be damaged during the process of anchoring the anchor bars, making them insufficiently anchored to the support foot;

[0014] 3. After the pier column is disconnected from the pedestal, there is an up-and-down staggered stress relationship between the pier column and the supporting foot. Since the pier column also supports the main beam, the weight of the main beam and the pier column is completely supported by the anchor bars fixed to the pier column. Therefore, during the rotation process, the anchor bars may be unable to support the weight, causing the pier column to slide down with the main beam, resulting in a serious safety accident.

[0015] In response to the above problems, the applicant proposed a new technical solution. Summary of the invention

[0016] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a bridge rotation system, which can realize the rapid and safe rotation of the bridge body, shorten the interruption time, and reduce the impact on existing traffic. The technical solutions adopted include:

[0017] A bridge rotation system is provided with a lower turntable and an upper turntable below the main beam, the lower turntable is arranged around the outer periphery of the pier, the upper turntable is arranged on the lower turntable and can rotate relative to the lower turntable on the lower turntable, and a plurality of supporting feet are provided on the upper turntable, the bottom of the supporting feet is fixed on the upper turntable, and the top surface of the supporting feet is used to support the bottom plate of the main beam.

[0018] A bridge rotation system according to an embodiment of the present invention also includes a plurality of rigid jacking devices, wherein the rigid jacking devices include a base and a jacking movable rod, wherein the base is fixed to the bottom plate of the main beam, the rod head of the jacking movable rod faces the upper turntable and rests on the upper turntable, and the jacking movable rod is controllably telescopic and movable.

[0019] According to a bridge rotation system of an embodiment of the present invention, the lower turntable is an annular concrete wall arranged on the pedestal or a plurality of steel pipe piles arranged around the outer periphery of the pier.

[0020] According to a bridge rotation system of an embodiment of the present invention, the lower turntable is a plurality of steel pipe piles arranged in water or on the ground, and the plurality of steel pipe piles are arranged around the outer periphery of the pier.

[0021] According to a bridge rotation system of an embodiment of the present invention, the upper turntable includes an upper steel box turntable and a rotation traction system, the upper steel box turntable is arranged on the lower turntable, and the base of the supporting leg falls on the upper steel box turntable.

[0022] According to a bridge rotation system of an embodiment of the present invention, the rotation traction system includes a pair of symmetrically arranged traction devices, the traction device includes a lower turntable tooth block, an upper turntable tooth block and an anchor cable, the lower turntable tooth block is arranged on the lower turntable, the upper turntable tooth block is arranged on the upper turntable, and the anchor cable connects the upper turntable tooth block and the lower turntable tooth block.

[0023] According to a bridge rotation system of an embodiment of the present invention, an MGE slide plate is provided between the upper steel box turntable and the lower turntable.

[0024] According to a bridge rotating system of an embodiment of the present invention, a limiting device is provided between the lower rotating table and the upper rotating table, and the limiting device includes a limiting base and a limiting wheel. The limiting base is fixed to the inner side of the lower rotating table, and the limiting wheel is arranged on the upper part of the limiting base and the inner side of the upper rotating table.

[0025] A bridge rotation system according to an embodiment of the present invention also includes a supporting truss, which is arranged between the side of the main beam and the supporting foot. The supporting truss is a triangular supporting frame, the bottom of which falls on the supporting foot, the top surface of which is supported under the top plate of the main beam, and the side surface of which is supported on the outer side of the web of the main beam.

[0026] According to a bridge rotation system of an embodiment of the present invention, the rigid jacking device is a hydraulic jack, and the jacking movable rod is a piston push rod of the hydraulic jack.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present invention, the lower turntable and the upper turntable built below the main beam can assist the bridge body in performing a straight rotation operation, and the supporting feet fixed on the upper turntable directly support the gravity on the main beam. The rotation operation can be performed after the pier and the main beam are disconnected. The rotation system will not damage the main structure of the main beam, and directly drives the main beam to rotate without the help of the pier. In this way, the original force distribution of the main beam is maintained to the greatest extent, so that the main beams of old bridges and dangerous bridges will not cause safety hazards due to changes in force during the subsequent straight rotation process. It can realize rapid and safe rotation of the bridge body, shorten the interruption time, and reduce the impact on existing traffic. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1Schematic diagram of the straight rotation using the bridge rotation system in the present invention Figure 1 ;

[0031] Figure 2 Schematic diagram of the straight rotation using the bridge rotation system in the present invention Figure 2 ;

[0032] Figure 3 The structure of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 4 The structure of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0034] Figure 5 The structure of the embodiment of the present invention is shown in FIG. Figure 3 ;

[0035] Figure 6 The structure of the embodiment of the present invention is shown in FIG. Figure 4 .

[0036] Description of main component symbols:

[0037] 10. Main beam; 20. Capping platform; 30. Pier; 40. Tower column; 50. Annular concrete wall; 60. Upper steel box turntable; 70. Support foot; 80. Hydraulic jack; 90. Lower turntable gear block; 100. Upper turntable gear block; 110. Anchor cable; 120. MGE slide plate; 130. Limiting device; 140. Longitudinal reinforcement; 150. Transverse reinforcement; 160. Diagonal brace; 170. Corbel. DETAILED DESCRIPTION

[0038] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0039] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0042] Example

[0043] The present invention provides a bridge rotation system, such as Figure 3 , 4 As shown in Figures 5 and 6, a lower turntable and an upper turntable are provided below the main beam 10. The lower turntable is provided around the outer periphery of the pier 30, and the upper turntable is provided on the lower turntable and can rotate relative to the lower turntable on the lower turntable. A plurality of supporting legs 70 are provided on the upper turntable, and the bottom of the supporting legs 70 is fixed on the upper turntable. The top surface of the supporting legs 70 is used to support the bottom plate of the main beam 10.

[0044] A lower turntable is built below the main beam 10, and then an upper turntable is built on the lower turntable, and then a support foot 70 is built on the upper turntable, and the top surface of the support foot 70 is attached to the bottom plate of the main beam 10 and supported on the bottom surface of the bottom plate of the main beam 10; then the connection between the pier 30 and the main beam 10 needs to be disconnected, generally at the junction of the pier 30 and the main beam 10. At this time, the gravity of the main beam 10 is transferred from the original main beam 10 to the pier 30, and then to the pedestal 20, and becomes the main beam 10 to the support foot 70, and then the support foot 70 sequentially transfers To the upper turntable, the lower turntable, and finally to the pedestal 20, at this time, the main beam 10 and the support foot 70 are in a gravity transmission relationship between the upper and lower layers, and no staggered forces will be generated. The gravity of the main beam 10 can be evenly transmitted to the upper turntable and the lower turntable through the support foot 70, and the support foot 70 is not anchored to the main beam 10, and will not damage the structure of the main beam 10. In this way, the original force distribution of the main beam 10 is maintained to the maximum extent, so that the main beam 10 of the old bridge and the dangerous bridge will not cause safety hazards due to changes in force during the subsequent straight rotation process. Next, the bridge body (including the main beam 10 and the tower column 40) can be rotated straight (such as Figure 1 , 2Specifically, the upper turntable is controlled to rotate on the lower turntable.

[0045] In the present invention, the lower turntable and the upper turntable built below the main beam 10 can assist the bridge body in performing a straight rotation operation. The support legs 70 fixed on the upper turntable directly support the gravity on the main beam 10. The rotation operation can be performed after the pier 30 and the main beam 10 are disconnected. The rotation system will not destroy the main structure of the main beam 10, and directly drives the main beam 10 to rotate without the help of the pier 30. In this way, the original force distribution of the main beam 10 is maintained to the greatest extent, so that the main beam 10 of the old bridge and the dangerous bridge will not cause safety hazards due to changes in force during the subsequent straight rotation process. It can realize the rapid and safe rotation of the bridge body, shorten the interruption time, and reduce the impact on existing traffic.

[0046] Further, in some embodiments of the present invention, Figure 4 , 5 As shown, the bridge rotation system also includes a plurality of rigid jacking devices, the rigid jacking devices include a base and a jacking movable rod, the base is fixed to the bottom plate of the main beam 10, the rod head of the jacking movable rod faces the upper turntable and leans against the upper turntable, and the jacking movable rod is controllably telescopic. In a specific embodiment, the rigid jacking device is a hydraulic jack 80, and the jacking movable rod is a piston push rod of the hydraulic jack 80. During the actual construction, it is difficult for the top surface of the supporting foot 70 to directly press against the bottom surface of the bottom plate of the main beam 10. Therefore, the hydraulic jack 80 is used to carry out the beam lowering operation. The piston push rod of the hydraulic jack 80 presses against the upper turntable. The pressing force can be adjusted by hydraulic pressure. After the push is completely completed, the main beam 10 and the pier 30 are cut. At this time, the entire gravity of the main beam 10 falls on the hydraulic jack 80. At this time, the hydraulic jack 80 controls the piston push rod to slowly contract, reducing the distance between the main beam 10 and the upper turntable until the bottom plate of the main beam 10 falls on the supporting foot 70. At this time, the main beam 10 falls on the supporting foot 70 and the hydraulic jack 80.

[0047] The structure of the lower turntable is determined according to the size of the support platform 20. When the size of the support platform 20 is large enough to arrange the lower turntable, the lower turntable is arranged on the top surface of the support platform 20. Further, in some embodiments of the present invention, such as Figure 3 , 4As shown in Figures 5 and 6, the lower turntable is an annular concrete wall 50 arranged on the pedestal 20. Some designs of the pedestal 20 are above the water surface, some are below the water surface, but most of them are located below the water surface. When the pedestal 20 is located below the water surface, it is necessary to build a cofferdam around the pedestal 20. The cofferdam is constructed by a water working ship, and the pedestal 20 is surrounded by the cofferdam. Then the water in the cofferdam is pumped out before the construction of the lower turntable is carried out. When the pedestal 20 is too small to be used for arranging the lower turntable, a plurality of steel pipe piles are directly set in the water or on the ground outside the pier 30 as the lower turntable, and the plurality of steel pipe piles are set around the outer periphery of the pier 30.

[0048] Further, in some embodiments of the present invention, Figure 3 , 4 As shown in Figures 5 and 6, the upper turntable includes an upper steel box turntable 60 and a swivel traction system. The upper steel box turntable 60 is arranged on the lower turntable. An MGE slide plate 120 is arranged between the upper steel box turntable 60 and the lower turntable to reduce the friction coefficient between the two. The base of the support leg 70 falls on the upper steel box turntable 60. When rotating, the rotation of the upper turntable is the result of the swivel traction system. The swivel traction system drives the support leg 70 and the upper steel box turntable 60 to rotate on the lower turntable. Figure 3 , 4 As shown in Figures 5 and 6, the rotating traction system includes a pair of symmetrically arranged traction devices, and the traction device includes a lower turntable tooth block 90, an upper turntable tooth block 100 and an anchor cable 110. The lower turntable tooth block 90 is arranged on the lower turntable, and the upper turntable tooth block 100 is arranged on the upper turntable. The anchor cable 110 connects the upper turntable tooth block 90 and the lower turntable tooth block 100. When rotating, the anchor cable 110 is pulled to drive the supporting legs 70 and the upper turntable to rotate on the lower turntable.

[0049] Further, in some embodiments of the present invention, Figure 3 , 4 As shown, a limit device 130 is provided between the lower turntable and the upper turntable, and the limit device 130 includes a limit base and a limit wheel. The limit base is fixed to the inner side of the lower turntable, and the limit wheel is arranged on the upper part of the limit base and the inner side of the upper turntable to prevent the upper turntable from deviating.

[0050] Furthermore, in some embodiments of the present application, the bridge rotation system also includes a supporting truss, which is arranged between the side of the main beam 10 and the supporting foot 70. The supporting truss is a triangular supporting frame, the bottom of which falls on the supporting foot 70, the top surface of which is supported below the top plate of the main beam 10, and the side surface of which is supported on the outer side of the web of the main beam 10. The supporting truss can further strengthen the structural support for the main beam 10 and strengthen the stability of the main beam 10. In addition, the main beam 10 can be longitudinally reinforced 140, transversely reinforced 150 or strengthened by setting diagonal braces 160 and corbels 170 according to strength requirements.

[0051] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A bridge rotation system, characterized in that: A lower turntable and an upper turntable are arranged below the main beam (10), the lower turntable is arranged around the outer periphery of the pier (30), the upper turntable is arranged on the lower turntable and can rotate relative to the lower turntable on the lower turntable, and a plurality of supporting legs (70) are arranged on the upper turntable, the bottom of the supporting legs (70) is fixed on the upper turntable, and the top surface of the supporting legs (70) is used to support the bottom plate of the main beam (10).

2. A bridge rotation system according to claim 1, characterized in that: It also includes a plurality of rigid lifting devices, which include a base and a lifting movable rod. The base is fixed to the bottom plate of the main beam (10). The rod heads of the lifting movable rods face the upper turntable and lean against the upper turntable. The lifting movable rods are controllably telescopic and movable.

3. A bridge rotation system according to claim 1, characterized in that: The lower turntable is an annular concrete wall (50) arranged on the cap (20) or a plurality of steel pipe piles arranged around the outer periphery of the pier column (30).

4. A bridge rotation system according to claim 1, characterized in that: The lower turntable is a plurality of steel pipe piles arranged in water or on the ground, and the plurality of steel pipe piles are arranged around the outer periphery of the pier column (30).

5. A bridge rotation system according to claim 3 or 4, characterized in that: The upper turntable comprises an upper steel box turntable (60) and a rotating body traction system. The upper steel box turntable (60) is arranged on the lower turntable, and the base of the supporting leg (70) falls on the upper steel box turntable (60).

6. A bridge rotation system according to claim 5, characterized in that: The rotating body traction system comprises a pair of symmetrically arranged traction devices, the traction devices comprising a lower turntable tooth block (90), an upper turntable tooth block (100) and an anchor cable (110), the lower turntable tooth block (90) being arranged on the lower turntable, the upper turntable tooth block (100) being arranged on the upper turntable, and the anchor cable (110) connecting the upper turntable tooth block (90) and the lower turntable tooth block (100).

7. A bridge rotation system according to claim 5, characterized in that: An MGE slide plate (120) is provided between the upper steel box turntable (60) and the lower turntable.

8. The bridge rotation system according to claim 1, characterized in that: A limiting device (130) is provided between the lower turntable and the upper turntable, the limiting device (130) comprising a limiting base and a limiting wheel, the limiting base being fixed to the inner side of the lower turntable, and the limiting wheel being arranged on the upper part of the limiting base and the inner side of the upper turntable.

9. The bridge rotation system according to claim 2, characterized in that: It also includes a supporting truss, which is arranged between the side of the main beam (10) and the supporting foot (70). The supporting truss is a triangular supporting frame, the bottom of which falls on the supporting foot (70), the top surface of which is supported below the top plate of the main beam (10), and the side surface of which is supported on the outer side of the web of the main beam (10).

10. A bridge rotation system according to claim 2, characterized in that: The rigid lifting device is a hydraulic jack (80), and the lifting movable rod is a piston push rod of the hydraulic jack (80).

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