Bridge slewing system and its application in bridge slewing construction

Abstract

The bridge construction of the present invention particularly refers to a bridge slewing system and its application in bridge slewing construction. The bridge slewing system includes a slewing bearing composed of upper and lower spherical pendulums with opposite inner end faces and rotational mating. The outer end face of the upper spherical pendulum is fixed to the upper bearing platform, and the outer end face of the lower spherical pendulum is fixed to the lower bearing platform. A traction slewing device is provided between the lower bearing platform and the upper bearing platform; on the surface of the lower bearing platform outside the slewing bearing, cushion stones are arranged at intervals in a circular distribution. A height adjustment device is provided on the upper surface of the cushion stones. The top of the height adjustment device is assembled with a clearance to the circular slideway and can form a sliding fit with the circular slideway through the increase of the height adjustment device. The circular slideway is fixed to the inner surface of the upper bearing platform. The present invention solves the technical problem that the existing construction methods cannot meet the requirements for safe construction across existing roads, and has the advantages of simple structure, high construction safety, and fast construction speed.

Description

Technical Field

[0001] The present invention belongs to bridge construction, and particularly relates to a bridge slewing system and its application in bridge slewing construction. Background Art

[0002] At present, the construction of rotating bridges in China mostly adopts the horizontal rotation method, that is, the bridge is fabricated on one side of a railway or highway, and after the bridge is completed, it is rotated into place through a rotating device. The rotating method of construction can better avoid the impact on the transportation of other lines and overcome the difficulties of erecting long-span bridges in alpine canyons, deep waters with rapid currents or rivers with frequent ship navigation. Especially for the construction of urban overpasses and railway overpasses with busy transportation, its advantages are more obvious.

[0003] After the existing rotation is completed, the upper and lower bearing platforms where the rotating structure is located need to be backfilled and sealed as a whole. Although this method strengthens and stabilizes the rotating bridge after rotation and ensures the safe operation of the bridge, during the service life of the bridge, necessary maintenance work still needs to be carried out on the bridge. In addition, in some special cases, such as natural disasters, etc., which cause damage to the rotating bridge and require repair or demolition work, at this time, how to construct while ensuring the safety of the existing roads (especially electrified railways) crossed is not satisfied by the existing rotating construction methods.

[0004] Since the first rotating bridge in China, 40 years have passed. Many rotating bridges have encountered various construction difficulties during maintenance or when they need to be demolished and rebuilt, resulting in a several-fold increase in the maintenance and demolition construction costs compared to other bridges. Therefore, if a technical solution that can realize the rotation of the rotating bridge at any time according to requirements after the bridge rotation can be achieved, a series of problems such as the later maintenance and construction of the rotating bridge will be successfully solved.

[0005] The background art retrieved by the applicant includes:

[0006] 1. A pier top rotating device for steel girders is disclosed in a patent document with the publication number CN106192766B. The rotating device is arranged between the bottom of the steel girder and the pier top, and includes a rotating ball hinge disposed at the center and a rotating support device that is concentric with the rotating ball hinge and disposed around the rotating ball hinge. Similar to traditional rotating structures, this device realizes the rotating requirement of the bridge and enables the overall detachable of the rotating device. However, this rotating device also has limitations and some defects: First, this device can only be applied to pier top rotation and is only used for pier top rotation of steel girder structures. Since most current rotating bridges have a pier bottom rotation structure and as the tonnage of rotating bridges increases, steel girders can no longer meet the current design requirements, so the market space for such rotating devices will become smaller and smaller. Second, although the overall detachable of this rotating device is mentioned, how to support and connect the upper and lower parts of the bridge after disassembly is not mentioned in the text. Rotation is only a process, and the normal operation of the bridge after rotation is the purpose, so how to support the upper and lower parts of the bridge after disassembly is very important. Third, when the rotating bridge needs maintenance after operating for a period of time, how to construct while ensuring the safety of the existing roads, especially electrified railways, that it crosses, the above-mentioned document cannot give an effective solution.

[0007] 2. A construction method for the rotation of a double - span integral extra - large - tonnage T - shaped rigid frame is disclosed in a patent document with the publication number CN108951427A. This method is the current mainstream rotation construction method, which details the construction processes such as the manufacture, installation, weighing, trial rotation, and formal rotation of the rotating device. At the same time, the document mentions that after the rotation is in place, the casting construction of the sealing disk concrete is immediately carried out to fix the turntable structure in the shortest time. After the T - shaped rigid frame rotates in place, the upper surface of the chassis is cleaned, the reserved steel bars are welded, the formwork is erected and the sealing and fixing concrete is poured to connect the upper turntable and the lower turntable into one body.

[0008] The above - mentioned patent document mentions pouring and sealing the upper and lower turntables after the rotation is in place. Similarly, if the rotating bridge needs maintenance after operating for a period of time and at the same time cannot affect the normal operation of the existing roads it crosses, only bridge rotation can be selected. However, how to break the sealing layer and how to ensure that the sealed rotating system can rotate normally after breaking cannot be obtained from the above - mentioned patent document.

[0009] Through the analysis of the above two patent documents, the current normal rotation construction method has been basically mature, but there is still no reasonable and effective solution for the rotation construction of the bridge. Summary of the Invention

[0010] The object of the present invention is to provide a bridge slewing system and its application in bridge slewing construction, which can perform slewing construction on the slewing bridge at any time as needed while meeting the construction method of the existing slewing bridge, and at the same time, there is no need to backfill and seal the upper and lower turntables, avoiding the waste of resources caused by the need to demolish and rebuild during the major repair and maintenance of the traditional slewing bridge.

[0011] The overall technical concept of the present invention is:

[0012] The bridge slewing system includes a slewing support composed of an upper spherical pendulum and a lower spherical pendulum with opposite inner end faces and rotatably matched. The outer end face of the upper spherical pendulum is fixed to the upper bearing platform, and the outer end face of the lower spherical pendulum is fixed to the lower bearing platform. A traction slewing device is provided between the lower bearing platform and the upper bearing platform; cushion blocks are arranged at intervals on the surface of the lower bearing platform outside the slewing support in a circular distribution. A height adjustment device is provided on the upper surface of the cushion block. The top of the height adjustment device is assembled with a clearance to the circular slideway and can form a sliding fit with the circular slideway through the increase of the height adjustment device. The circular slideway is fixed to the lower surface of the upper bearing platform.

[0013] The application of the bridge slewing system in bridge slewing construction.

[0014] The specific technical structure of the present invention also includes:

[0015] To facilitate the height adjustment device to support the beam body and play a role in bridge slewing, a preferred technical implementation means is that the increase amount of the height adjustment device is 0 - 30 mm.

[0016] The height adjustment device is preferably a height adjustment support, but not limited to injection pressure support types. Any device with a height adjustment function does not fall outside the protection scope of this patent. Among them, a preferred technical implementation means is that the height adjustment device selects a height adjustment support. The height adjustment device includes an upper support plate, a rubber cushion plate, and a basin seat plate arranged from top to bottom. The rubber cushion plate is arranged at the bottom of the pelvic cavity of the basin seat plate. The upper support plate is attached to the upper surface of the rubber cushion plate. A grouting hole channel communicating with the inside of the pelvic cavity is opened on the outer wall of the basin seat plate.

[0017] To make the sliding fit between the top of the height adjustment device and the circular slideway smoother, a preferred technical implementation means is that a tetrafluoroethylene slide plate is fixed on the upper surface of the upper seat plate.

[0018] To prevent sundries from entering the pelvic cavity of the basin seat plate, a preferred technical implementation means is that a sealing ring is provided between the outer edge of the upper support plate and the inner surface of the pelvic cavity of the basin seat plate.

[0019] To better achieve the sliding fit between the annular slideway and the top of the height-adjusting device, the preferred technical implementation means is that the annular slideway includes a pre-embedded steel plate buried in the upper bearing platform, an annular steel plate fixed to the outer surface of the pre-embedded steel plate, the inner surface of the annular steel plate is adapted to the top of the height-adjusting device and a mirror stainless steel plate is fixed to its inner surface, and the mirror stainless steel plate can form a sliding fit with the top of the height-adjusting device through the height increase of the height-adjusting device.

[0020] To better achieve the positioning of the height-adjusting device and realize the stable and effective support for the beam body, the preferred technical implementation means is that limit blocks are provided on the cushion stones on both sides of the height-adjusting device.

[0021] To facilitate the maintenance and repair by personnel, the preferred technical implementation means is that inspection holes are provided on the cushion stones.

[0022] To realize the positioning of the rotating structure after the bridge construction rotation is in place, the preferred technical implementation means is that longitudinally distributed pre-embedded steel bars are correspondingly provided on the upper bearing platform and the lower bearing platform, and the pre-embedded steel bars on the upper bearing platform and the lower bearing platform are fixed by connecting steel bars.

[0023] To better realize the fixation of the pre-embedded steel bars and the connecting steel bars, a more preferred technical implementation means is that the connecting steel bars are fixed to the pre-embedded steel bars on the upper bearing platform and the lower bearing platform in a cross-shaped manner.

[0024] To better achieve the protection of the rotating support, avoid affecting the rotation effect due to the entry of sundries, the preferred technical implementation means is that sealing enclosing plates fixed by clamps are provided on the outer sides of the upper spherical pendulum and the lower spherical pendulum of the height-adjusting device.

[0025] To realize the rotation of the rotating support, the preferred technical implementation means is that the traction and rotation device includes a forward rotation reaction seat and a rotation reaction seat arranged on the lower bearing platform with opposite traction directions, a rotation anchor plate embedded in the inner surface of the upper bearing platform and capable of realizing rotational assembly with it, and a hanging part arranged on the upper bearing platform and capable of adapting to the end of the steel strand.

[0026] To facilitate the secondary height adjustment of the height-adjusting device to meet the height adjustment requirements during rotation and turning, the preferred technical solution is that at least two grouting channels of the height-adjusting device are opened on the basin seat plate and communicate with the outside and the inside of the basin, and at least one is sealed with sealing paraffin.

[0027] The application of the bridge rotation system in bridge rotation construction includes the following steps:

[0028] a. When the bridge erection rotation is completed, install the height-adjusting device on the cushion stone of the lower bearing platform, inject liquid heightening material into the pelvic cavity through the grouting channel to synchronously pressurize and heighten each height-adjusting device until it forms a support for the beam body and the support force does not exceed the weight of the beam body. After the injected liquid material is solidified, seal the grouting plug wire and make marks.

[0029] b. After fixing the embedded steel bars on the upper bearing platform and the lower bearing platform with connecting steel bars, protect the outer sides of the upper bearing platform and the lower bearing platform.

[0030] c. When the bridge needs to rotate, remove the fixing device between the upper bearing platform and the lower bearing platform and the protective devices on the outer sides of the upper bearing platform and the lower bearing platform.

[0031] d. Clean the surfaces of all parts inside the bridge rotation system.

[0032] e. Check whether the height-adjusting device can normally lift the beam. If it is damaged, install a height-adjusting device at the spare points of the bearing pad stone.

[0033] f. Determine the beam lifting load of the height-adjusting device according to the aging condition of the slewing bearing. If the slewing bearing cannot be used, heat the unmarked grouting ducts. After the sealing paraffin melts, raise the height-adjusting device through the grouting ducts until the upper spherical pendulum and the lower spherical pendulum are separated up and down. If the slewing bearing can still perform the slewing function, do not raise the height-adjusting device anymore and let the height-adjusting device bear part of the beam load.

[0034] g. Re-anchor the steel strands in the reverse direction and connect them to the synchronous jacks installed on the slewing reaction seats for a trial rotation.

[0035] h. Perform a formal rotation.

[0036] i. After fixing the embedded steel bars on the upper bearing platform and the lower bearing platform with connecting steel bars, protect the outer sides of the upper bearing platform and the lower bearing platform to complete the rotation.

[0037] To reduce the load on the slewing bearing and thus reduce its failure rate, the preferred technical implementation means is that in step a, the height-adjusting device is pressurized through the grouting ducts until it is evenly loaded.

[0038] To increase the connection firmness between the embedded steel bars and the connecting steel bars and improve the fixing effect, the preferred technical implementation means is that step b is to weld and fix the connecting steel bars to the embedded steel bars on the upper bearing platform and the lower bearing platform in a cross manner.

[0039] To better protect the slewing bearing, the preferred technical implementation means is that in step b, when protecting the outer sides of the upper bearing platform and the lower bearing platform, after fixing the connecting steel bars to the embedded steel bars on the upper bearing platform and the lower bearing platform, cast sealing concrete between the upper bearing platform and the lower bearing platform on the outer side of the slewing bearing.

[0040] A further preferred technical implementation means is that in step b, when protecting the outer sides of the upper bearing platform and the lower bearing platform, after fixing the connecting steel bars to the embedded steel bars on the upper bearing platform and the lower bearing platform, fix the sealing enclosure by clamps on the outer sides of the upper spherical pendulum and the lower spherical pendulum, and cast sealing concrete between the upper bearing platform and the lower bearing platform on the outer side of the slewing bearing.

[0041] The substantial features and significant technical advances achieved by the present invention are:

[0042] 1. The rotary construction method proposed in the present invention can perform rotary construction on the rotary bridge at any time according to the needs, without backfilling and sealing the upper and lower turntables, successfully solving a series of problems in the later maintenance and construction of the rotary bridge, and avoiding the waste of resources caused by the need to dismantle and rebuild the traditional rotary bridge during overhaul and maintenance. The construction is safe and fast, with strong on-site operability, low investment, and obvious economic and social benefits.

[0043] 2. The height-adjusting device of the present invention is arranged in a ring shape. First, the height-adjusting device can be used to increase the height of the beam to provide effective support. Second, when a swivel support fails, the height-adjusting device can be used to rotate the beam. Third, when a height-adjusting device fails, it can be replaced or repaired in time.

[0044] 3. Using a height-adjusting device to provide auxiliary support for the beam can effectively reduce the load on the swivel support and increase its service life.

[0045] 4. The use of connecting steel bars and pre-buried steel bars can achieve effective positioning after the bridge is rotated or closed. The connection method is stable and reliable, and it is simple and convenient when it needs to be dismantled to achieve rotation.

[0046] 5. The use of sealed enclosures and sealing concrete structures not only facilitates disassembly and assembly, but also effectively realizes the internal protection of the rotating support and the entire slewing system, prevents the entry of external debris, and ensures the relative closed and stable working environment of the slewing system.

[0047] 6. The top of the height-adjusting device is assembled with a gap between it and the annular slideway, and the structural design can form a sliding fit with the annular slideway by increasing the height of the height-adjusting device. Firstly, the structure ensures that the height-adjusting device can fit flexibly with the annular slideway after the height is increased. Secondly, the fit gap between the height-adjusting device and the annular slideway reduces the load and reduces the failure rate caused by the load.

[0048] 7. The structural design of the inspection hole makes it easy for personnel to enter to inspect and maintain the operation of the slewing system without affecting the operation of the system and the stability of the support.

[0049] 8. The structural design of pad stones and limit blocks can facilitate the installation and arrangement of the height-adjusting device and reduce the adjustment amount of the height-adjusting device; secondly, it can facilitate the positioning of the height-adjusting device to prevent it from moving under the action of external force and thus changing the layout of the stable support. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of the present invention.

[0051] Figure 2It is a distribution schematic diagram of the slewing bearing and height adjustment device of the present invention.

[0052] Figure 3 It is a structural schematic diagram during normal rotation under the action of the slewing bearing of the present invention.

[0053] Figure 4 It is a structural schematic diagram during rotation in the non-working state of the slewing bearing of the present invention.

[0054] Figure 5 It is a schematic diagram of the slewing and slewing traction of the present invention.

[0055] Figure 6 It is an elevation schematic diagram of the anchor plate installation during rotation of the present invention.

[0056] Figure 7A It is a plan schematic diagram of the slewing bearing of the present invention.

[0057] Figure 7B It is Figure 7A Partial enlarged view of part Ⅰ.

[0058] Figure 8 It is a structural schematic diagram of the height adjustment device in the present invention.

[0059] Figure 9 It is a construction schematic diagram of the pressure boosting of the height adjustment device in the present invention.

[0060] Figure 10A It is a structural schematic diagram of the annular slideway of the present invention.

[0061] Figure 10B It is Figure 10A Partial enlarged view of part Ⅱ.

[0062] Figure 11 It is a structural schematic diagram of the cushion stone of the height adjustment device of the present invention.

[0063] Figure 12 It is a top view schematic diagram of the cushion stone of the height adjustment device of the present invention.

[0064] Figure 13 It is a connection schematic diagram of the embedded steel bars and connecting steel bars of the upper bearing platform and the lower bearing platform in the present invention.

[0065] Figure 14 It is Figure 13 Top view.

[0066] Figure 15 It is an elevation view of the surface sealing after rotation in the present invention.

[0067] The reference numerals in the drawings are as follows:

[0068] 1. Slewing bearing; 1A. Upper spherical pendulum; 1B. Lower spherical pendulum; 1C. Sealing shroud; 2. Ring-shaped slideway; 2A. Embedded steel plate; 2B. Ring-shaped steel plate; 2C. Mirror stainless steel plate; 3. Height-adjusting device; 3A. Teflon slide plate, 3B. Upper bearing plate; 3C. Sealing ring; 3D. Rubber cushion plate; 3E. Basin seat plate; 3F. Grouting plug screw; 4. Padstone; 5. Upper bearing platform; 6. Lower bearing platform; 7. Positive rotation reaction seat; 8. Rotary reaction seat; 9. Rotary anchor plate; 10. Grouting machine; 11. Connecting steel bars; 12. Embedded steel bars; 13. Sealing layer concrete. Detailed implementation mode

[0069] The following further describes the present invention in conjunction with embodiments, but it is not a limitation to the present invention. The protection scope of the present invention is subject to the content recorded in the claims. Any equivalent technical means substitution made according to the description of the specification shall not depart from the protection scope of the present invention.

[0070] Embodiment

[0071] The specific structure of this embodiment is as shown in the figure. The bridge slewing system includes a slewing bearing 1 composed of an upper spherical pendulum 1A and a lower spherical pendulum 1B with opposite inner end faces and rotationally matched. The outer end face of the upper spherical pendulum 1A is fixed to the upper bearing platform 5, and the outer end face of the lower spherical pendulum 1B is fixed to the lower bearing platform 6. A traction slewing device is provided on the lower bearing platform 6 and the upper bearing platform 5; on the surface of the lower bearing platform 6 outside the slewing bearing 1, padstones 4 are arranged at intervals in a ring-shaped distribution. The upper surface of the padstone 4 is provided with a height-adjusting device 3. The top of the height-adjusting device 3 is assembled with a clearance to the ring-shaped slideway 2 and can form a sliding fit with the ring-shaped slideway through the increase of the height-adjusting device 3. The ring-shaped slideway 2 is fixed to the inner surface of the lower bearing platform 6.

[0072] Application of the bridge slewing system in bridge slewing construction.

[0073] The increase amount of the height-adjusting device 3 is 0 - 30 mm.

[0074] The height-adjusting device 3 is selected as a height-adjusting bearing. The height-adjusting device 3 includes an upper bearing plate 3B, a rubber cushion plate 3D, and a basin seat plate 3E arranged from top to bottom. The rubber cushion plate 3D is arranged at the bottom of the pelvic cavity of the basin seat plate 3E. The upper bearing plate 3B is attached to the upper surface of the rubber cushion plate 3D. A grouting hole channel communicating with the inside of the pelvic cavity is opened on the outer wall of the basin seat plate 3E.

[0075] A Teflon slide plate 3A is fixed on the upper surface of the upper bearing plate 3B.

[0076] A sealing ring 3C is arranged between the outer edge of the upper bearing plate 3B and the inner surface of the pelvic cavity of the basin seat plate 3E.

[0077] The annular slideway 2 includes a pre-buried steel plate 2A embedded in the lower bearing platform 6, an annular steel plate 2B with its outer surface fixed to the pre-buried steel plate 2A, the inner surface of the annular steel plate 2B being adapted to the top of the height-adjusting device 3 and having a mirror stainless steel plate 2C fixed to its inner surface. The mirror stainless steel plate 2C can form a sliding fit with the top of the height-adjusting device 3 through the height increase of the height-adjusting device 3.

[0078] Limit blocks are provided on the cushion stones 4 on both sides of the height-adjusting device 3.

[0079] Inspection holes are provided on the cushion stones 4.

[0080] Longitudinally distributed pre-buried steel bars 12 are correspondingly provided on the upper bearing platform 5 and the lower bearing platform 6, and the pre-buried steel bars 12 on the upper bearing platform 5 and the lower bearing platform 6 are fixed by connecting steel bars 11. The connecting steel bars 11 are fixed to the pre-buried steel bars 12 on the upper bearing platform 5 and the lower bearing platform 6 in a cross-shaped manner.

[0081] Sealing enclosing plates 1C fixed by clamps are provided on the outer sides of the upper spherical pendulum 1A and the lower spherical pendulum 1B of the slewing bearing 1.

[0082] The traction slewing device includes a forward rotation reaction seat 7 and a slewing reaction seat 8 arranged on the lower bearing platform 6 with opposite traction directions, a slewing anchor plate 9 embedded in the inner surface of the upper bearing platform 5 and capable of realizing rotational assembly with it, and a hanging part arranged on the upper spherical pendulum 1A and adapted to the end of the steel strand.

[0083] There are at least two grouting channels of the height-adjusting device 3 which are opened on the basin seat plate 3E and communicate with the outside and the inside of the basin, and at least one of them is encapsulated with sealing paraffin.

[0084] The application of the bridge slewing system in bridge slewing construction includes the following steps:

[0085] a. When the bridge erection and slewing are completed, install the height-adjusting device 3 on the cushion stone 4 of the lower bearing platform 6, use a grouting machine 10 to inject liquid heightening material into the basin through the grouting channel to synchronously pressurize and heighten each height-adjusting device 3 until it forms a support for the beam body and the support force does not exceed the weight of the beam body. After the injected liquid material solidifies, seal the grouting plug wire 3F and make a mark.

[0086] Such as Figure 5As shown in the figure, during the construction of a swivel bridge, for a bridge that requires swiveling, first, two sets of reaction seats for forward and reverse rotation, namely the forward rotation reaction seat 7 and the swivel reaction seat 8, are set on the lower bearing platform 6. The forward rotation reaction seat 7 is used for the tensioning of steel strands during normal swiveling, and the swivel reaction seat 8 is used for the tensioning of steel strands during swiveling. After the normal swiveling is completed, the steel strands used for normal swiveling are removed. When swiveling, one end of the steel strand is inserted into the swivel anchor plate 9 reserved on the upper bearing platform 5, and the steel strand is locked with a wedge grip. After the steel strand winds half a circle on the upper bearing platform 5, the other end is inserted into the tensioning equipment behind the swivel reaction seat 8. The number of steel strands is the same as that during the first closure swiveling.

[0087] b. After fixing the embedded steel bars 12 on the upper bearing platform 5 and the lower bearing platform 6 through the connecting steel bars 11, the outer sides of the upper bearing platform 5 and the lower bearing platform 6 are protected.

[0088] c. When the bridge needs to perform swiveling operations, the fixing device between the upper bearing platform 5 and the lower bearing platform 6 and the protective devices on the outer sides of the upper bearing platform 5 and the lower bearing platform 6 are removed.

[0089] d. Clean the surfaces of each part in the bridge swiveling system.

[0090] e. Check whether the height-adjusting device 3 can normally lift the beam. If it is damaged, install the height-adjusting device 3 at the spare points of the bearing pad stone 4.

[0091] f. Determine the beam lifting load of the height-adjusting device 3 according to the aging condition of the swivel bearing 1. If the swivel bearing 1 cannot be used, heat the unmarked grouting holes. After the sealing paraffin melts, use the grouting machine 10 to evenly increase the height of the height-adjusting device 3 through the grouting holes until the upper spherical pendulum 1A and the lower spherical pendulum 1B are separated from each other. See Figure 9 specifically. If the swivel bearing 1 can still realize the swiveling function, the height of the height-adjusting device 3 is not increased anymore, and the height-adjusting device 3 bears part of the beam load.

[0092] g. Re-anchor the steel strands in the reverse direction and connect them to the synchronous jack installed on the swivel reaction seat 8 for a trial rotation.

[0093] h. Perform the formal rotation.

[0094] i. Remove the steel strands. After fixing the embedded steel bars 12 on the upper bearing platform 5 and the lower bearing platform 6 through the connecting steel bars 11, the outer sides of the upper bearing platform 5 and the lower bearing platform 6 are protected to complete the rotation.

[0095] In step a described above, the height-adjusting device 3 is pressurized through the grouting holes until it is evenly pressurized.

[0096] In step b described above, the connecting steel bars 11 are welded and fixed to the embedded steel bars 12 on the upper bearing platform 5 and the lower bearing platform 6 in a cross manner.

[0097] In step b, for the protection of the outer sides of the upper bearing platform 5 and the lower bearing platform 6, after fixing the connecting steel bars 11 to the embedded steel bars 12 on the upper bearing platform 5 and the lower bearing platform 6, the sealing enclosing plate 1C is fixed to the outer sides of the upper spherical pendulum 1A and the lower spherical pendulum 1B by clamps, and the sealing concrete 13 is poured between the upper bearing platform 5 and the lower bearing platform 6 on the outer side of the slewing bearing 1.

[0098] When the height adjustment device 3 is adjusted in height, a two-component polyurethane rubber is injected into the pelvic cavity of the basin seat plate 3E through the grouting duct by a grouting press (or other height adjustment equipment). Observe the stress state of each height adjustment device 3 to ensure that each height adjustment device 3 can be uniformly compressed. Keep a certain pressure for a period of time to wait for the two-component polyurethane rubber to cure. The two-component polyurethane rubber is a kind of high molecular elastic material with the function of self-leveling at normal temperature. Its mechanical property indexes are equivalent to those of the bearing rubber plate of the conventional railway pot rubber bearing, and it can meet the angular rotation requirements after the beam body adjusts its posture. Each grouting press 10 is equipped with a hydraulic sensor to keep the pressure of each grouting press 10 synchronized at all times, and at the same time, the height of the beam body is monitored by a height measuring device at all times to ensure that the beam body can be smoothly lifted.

[0099] Taking a 5000-ton slewing bridge as an example, usually the diameter of the upper bearing platform 5 is about 6m, and the diameter of the slewing bearing 1 is 2050mm.

[0100] According to the above structural dimensions, the cushion stone 4 for slewing is arranged within a range of 4m - 5m in diameter, and the cushion stones 4 are evenly separated into multiple points by the retaining blocks. The annular slideway 2 is installed on the lower surface of the upper bearing platform 5 directly above the cushion stone 4.

[0101] Taking 8 groups of height adjustment devices 3 as an example, after the normal slewing is completed, heat one of the grouting ducts of the height adjustment device 3 to melt the sealing paraffin in it. Use a grouting press to pressurize and lift the beam through this grouting duct of the height adjustment device 3, so that the height adjustment device 3 bears part of the weight of the beam body, and the stress of each group of height adjustment devices 3 is made uniform. For example, make 8 groups of height adjustment devices 3 bear a beam body weight of 1000 tons (this is not limited to a specific tonnage here), and use a grouting press to pressurize each group of height adjustment devices 3 to 10 Mpa through the grouting duct and keep it stable.

[0102] When the bridge needs to rotate, check the slewing bearing 1 and the height-adjusting device 3. If the slewing bearing 1 can still realize the rotation function, there is no need to continue pressurizing the height-adjusting device 3 to jack up the beam. The slewing bearing 1 still serves as the main rotating structure, and the annularly distributed height-adjusting devices 3 play a role in supporting and assisting sliding. If the slewing bearing 1 is aged or damaged and can no longer realize the rotation function, it is necessary to continue pressurizing the height-adjusting device 3 to jack up the beam, so that the upper and lower spherical pendulums of the slewing bearing 1 are completely disengaged. At this time, the annularly distributed height-adjusting devices 3 bear the entire weight of the 5000-ton beam. Taking 8 groups of height-adjusting devices as an example (not limited to 8 groups), the weight borne by each group of height-adjusting devices 3 is 50000 / 8 = 6250 KN. After heating another grouting duct to melt the sealing paraffin in it, use a grouting press to pressurize each group of height-adjusting devices to 35 MPa through this grouting duct and keep it stable.

[0103] At this time, the annularly distributed height-adjusting devices 3 bear the entire weight of the beam. The friction coefficient of the tetrafluoroethylene slide plate is 0.03. The calculated starting force for rotation is 150 tons, and the breaking force of each steel strand is 26 tons. Considering the safety factor, 15 steel strands can be arranged on each side of the rotation anchor plate 9.

Claims

1. Bridge slewing system, comprising a slewing bearing (1) composed of an upper spherical pendulum (1A) and a lower spherical pendulum (1B) with their inner end faces facing each other and being rotationally mated. The outer end face of the upper spherical pendulum (1A) is fixed to the upper bearing platform (5), the outer end face of the lower spherical pendulum (1B) is fixed to the lower bearing platform (6), and a traction slewing device is provided between the lower bearing platform (6) and the upper bearing platform (5). It is characterized in that On the surface of the lower bearing platform (6) outside the slewing bearing (1), cushion stones (4) are arranged at intervals in an annular distribution. A height adjustment device (3) is provided on the upper surface of the cushion stones (4). The height adjustment device (3) includes an upper bearing plate (3B), a rubber cushion plate (3D), and a pot seat plate (3E) arranged from top to bottom. The rubber cushion plate (3D) is arranged at the bottom of the pelvic cavity of the pot seat plate (3E). The upper bearing plate (3B) is attached to the upper surface of the rubber cushion plate (3D). Injection hole channels communicating with the inside of the pelvic cavity are opened on the outer wall of the pot seat plate (3E). There are at least two injection hole channels of the height adjustment device (3) that are opened on the pot seat plate (3E) and communicate with the outside and the inside of the pelvic cavity, and at least one of them is sealed with paraffin. The top of the height adjustment device (3) is assembled with a clearance to the annular slideway (2) and can form a sliding fit with the annular slideway through the increase in height of the height adjustment device (3). The annular slideway (2) is fixed to the inner surface of the upper bearing platform (5); Corresponding longitudinal distribution of embedded steel bars (12) is provided on the upper bearing platform (5) and the lower bearing platform (6), and the embedded steel bars (12) on the upper bearing platform (5) and the lower bearing platform (6) are fixed by connecting steel bars (11).

2. The bridge slewing system according to claim 1, It is characterized in that The increase in height of the height adjustment device (3) is 0 - 30 mm, excluding 0.

3. The bridge slewing system according to claim 1, It is characterized in that A tetrafluoroethylene sliding plate (3A) is fixed on the upper surface of the upper bearing plate (3B).

4. The bridge slewing system according to claim 1, It is characterized in that A sealing ring (3C) is provided between the outer edge of the upper bearing plate (3B) and the inner surface of the pelvic cavity of the pot seat plate (3E).

5. The bridge slewing system according to any one of claims 1 to 4, It is characterized in that The annular slideway (2) includes an embedded steel plate (2A) embedded in the upper bearing platform (5), an annular steel plate (2B) with its outer surface fixed to the embedded steel plate (2A), the inner surface of the annular steel plate (2B) is adapted to the top of the height adjustment device (3) and a mirror stainless steel plate (2C) is fixed on its inner surface. The mirror stainless steel plate (2C) can form a sliding fit with the top of the height adjustment device (3) through the increase in height of the height adjustment device (3).

6. The bridge slewing system according to any one of claims 1 to 4, It is characterized in that Limit blocks are provided on the cushion stones (4) on both sides of the height adjustment device (3).

7. The bridge slewing system according to claim 6, It is characterized in that Inspection holes are provided on the cushion stones (4).

8. The bridge slewing system according to claim 1, It is characterized in that The connecting steel bars (11) are fixed to the embedded steel bars (12) on the upper bearing platform (5) and the lower bearing platform (6) in a cross - cross manner.

9. The bridge slewing system according to any one of claims 1 or 8, It is characterized in that a sealing shroud (1C) fixed by a clamp is provided on the outer sides of the upper spherical pendulum (1A) and the lower spherical pendulum (1B) of the slewing support (1).

10. The bridge slewing system according to claim 1, It is characterized in that the traction slewing device includes a forward reaction seat (7) and a slewing reaction seat (8) which are arranged on the lower bearing platform (6) and have opposite traction directions, a slewing anchor plate (9) embedded in the inner surface of the upper bearing platform (5) and capable of realizing rotational assembly therewith, and a hanging portion which is arranged on the upper bearing platform (5) and can be adapted to the end of the steel strand.

11. The application of the bridge slewing system according to any one of claims 1-10 in bridge slewing construction, It is characterized in that it includes the following steps: a. When the bridge erection slewing is completed, install a height adjustment device (3) on the bearing pad stone (4) of the lower bearing platform (6), inject liquid heightening material into the pelvic cavity through the grouting duct, and synchronously pressurize and heighten each height adjustment device (3) until it forms a support for the beam body and the support force does not exceed the weight of the beam body. After the injected liquid material is solidified, seal the grouting plug wire (3F) and make a mark; b. After fixing the embedded steel bars (12) on the upper bearing platform (5) and the lower bearing platform (6) through the connecting steel bars (11), protect the outer sides of the upper bearing platform (5) and the lower bearing platform (6); c. When the bridge needs to perform slewing operation, remove the fixing device between the upper bearing platform (5) and the lower bearing platform (6) and the protective device on the outer sides of the upper bearing platform (5) and the lower bearing platform (6); d. Clean the surfaces of all parts in the bridge slewing system; e. Check whether the height adjustment device (3) can normally jack the beam. If it is damaged, install a height adjustment device (3) at the spare point of the bearing pad stone (4); f. Determine the beam jacking load of the height adjustment device (3) according to the aging condition of the slewing support (1). If the slewing support (1) cannot be used, heat the unmarked grouting duct. After the sealing paraffin melts, evenly heighten the height adjustment device (3) through the grouting duct until the upper spherical pendulum (1A) and the lower spherical pendulum (1B) are separated up and down. If the slewing support (1) can still realize the slewing function, do not heighten the height adjustment device (3) anymore and let the height adjustment device (3) bear part of the beam body load; g. Re-anchor the steel strand in the opposite direction and connect it to the synchronous jack installed on the slewing reaction seat (8) for trial rotation; h. Perform formal slewing; i. Remove the steel strand, fix the embedded steel bars (12) on the upper bearing platform (5) and the lower bearing platform (6) of the slewing support (1) through the connecting steel bars (11); protect the outer sides of the upper bearing platform (5) and the lower bearing platform (6) to complete the slewing.

12. The application according to claim 11, It is characterized in that in step a, the height adjustment device (3) is pressurized through the grouting duct until it is evenly pressurized.

13. The application according to claim 11, It is characterized in that in step b, the connecting steel bars (11) are welded and fixed to the embedded steel bars (12) on the upper bearing platform (5) and the lower bearing platform (6) in a cross manner.

14. The application according to any one of claims 11 or 13, It is characterized in that In step b, the protection of the outer sides of the upper bearing platform (5) and the lower bearing platform (6) is carried out by fixing the connecting steel bars (11) to the embedded steel bars (12) on the upper bearing platform (5) and the lower bearing platform (6), and then pouring sealing concrete (13) between the upper bearing platform (5) and the lower bearing platform (6) on the outer side of the slewing bearing (1).

15. The application according to claim 14, characterized in that in step b, the protection of the outer sides of the upper bearing platform (5) and the lower bearing platform (6) is carried out by fixing the connecting steel bars (11) to the embedded steel bars (12) on the upper bearing platform (5) and the lower bearing platform (6), fixing the sealing enclosure (1C) to the outer sides of the upper spherical pendulum (1A) and the lower spherical pendulum (1B) by clamps, and then pouring sealing concrete (13) between the upper bearing platform (5) and the lower bearing platform (6) on the outer side of the slewing bearing (1).

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