Swivel bridge spherical hinge installation precision control construction method and system

Abstract

The invention discloses a swivel bridge spherical hinge installation precision control construction method and system. The method mainly comprises the steps that a polyethylene slip sheet is installed and finely adjusted, wherein the polyethylene slip sheet is installed on the surface, meeting the precision requirement, of a lower spherical hinge in advance before the spherical hinge is installed; mounting and fine adjustment of a lower spherical hinge: precisely positioning the lower spherical hinge by using a high-precision control net and a high-precision measuring instrument, and mounting the lower spherical hinge to the central position of the lower bearing platform; and upper spherical hinge mounting and fine adjustment: mounting an upper spherical hinge meeting the precision requirement above the top surface of the lower spherical hinge, and performing fine adjustment on the central position of the upper spherical hinge, so that the circle center is centered after the upper spherical hinge is mounted. The method is suitable for installation of swivel bridge spherical hinges constructed through various types of horizontal swivel methods, and the installation precision of the spherical hinges can be improved and swivel errors can be reduced by means of the method for construction of railway swivel bridges or construction of swivel bridges such as highways, rivers and canyons.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a construction method and system for controlling the installation accuracy of a spherical joint of a swivel bridge. Background Art

[0002] In recent years, with the rapid development of transportation construction, the number of long and large bridge projects across existing lines has increased. At present, the construction technology of rotating bridges with less impact on existing lines is mostly used. This technology is widely used in the construction of rotating bridges across railway lines, highways, waterways, etc. The construction technology of rotating bridges is simple, fast, and safe, and has broad development prospects. With the advancement of construction technology, higher precision requirements are placed on the construction of rotating bridges. Among them, the precision control of the ball joint system of the rotating bridge is the most critical component in the construction of the rotating bridge. The precision control of the ball joint directly affects the safety and quality of the rotating construction. Summary of the invention

[0003] The present application provides a construction method and system for precision control of the ball joint installation of a swivel bridge, so as to solve the problem of high-precision control of the installation of the ball joint system of the swivel bridge.

[0004] According to the first aspect, an embodiment provides a method for controlling the installation accuracy of a swivel bridge ball joint, wherein the ball joint is arranged between an upper bearing platform and a lower bearing platform of a swivel mechanism, the ball joint comprises an upper ball joint and a lower ball joint, and a polyethylene sliding sheet is arranged between the upper ball joint and the lower ball joint, and the method comprises: Installation and fine adjustment of polyethylene slide: Before installing the ball joint, install the polyethylene slide to the lower ball joint surface that meets the accuracy requirements; Installation and fine adjustment of the lower ball joint: Use a high-precision control network and a high-precision measuring instrument to accurately position the lower ball joint and install it to the center of the lower bearing platform; Installation and fine-tuning of the upper ball joint: Install an upper ball joint that meets the precision requirements above the top surface of the lower ball joint, and fine-tune the center position of the upper ball joint so that the center of the circle is centered after the upper ball joint is installed.

[0005] Furthermore, before the lower ball joint is installed and fine-tuned, the method further comprises: Lay out a high-precision control network: the plane re-survey adopts satellite positioning static observation, and the elevation re-survey adopts national second-class leveling observation.

[0006] Furthermore, the polyethylene slide is installed and fine-tuned, specifically including: Installation of PTFE slides: When installing PTFE slides, clean the top surface of the lower ball joint to ensure that there are no debris on the ball joint surface and in the hole where the PTFE slides are installed, and blow the spherical surface clean; mark the numbers in the holes of the lower ball joint, align the PTFE slides with the numbers and install them, and fine-tune the PTFE slides at the same time to ensure that each PTFE slide is installed in one step without duplication of work; Fine-tuning of polytetrafluoroethylene slides: Fine-tuning uses a precision control network, an electronic level with an accuracy of 0.01mm, and an indium tile ruler. The "elevation transfer" method is used to measure the elevation of each polytetrafluoroethylene slide, and fine-tuning is performed one by one from the center of the spherical joint to the outside, while measuring and adjusting to ensure that the elevation error of the polytetrafluoroethylene slide with the top surface on the same spherical surface is lower than the preset value.

[0007] Furthermore, the polyethylene slide installation and fine adjustment specifically include: Re-measurement of PTFE slide: After the installation and fine-tuning of the PTFE slide is completed, the entire PTFE slide is re-measured, and the "elevation transfer" method is still used to measure from the inside to the outside step by step. If it does not meet the design requirements, it will be directly adjusted and the measurement will be repeated until the elevation error is lower than the preset value. If it meets the design requirements, the next process will be carried out.

[0008] Furthermore, the installation and fine adjustment of the lower ball joint specifically include: Ball joint plane control: After the ball joint accuracy measurement is qualified, the lower ball joint is installed with a crane and fixed on the steel frame; at the same time, a precision control network and a precision total station with an accuracy of 0.5″ are used, and the “cross line centering method” and “coordinate control method” are adopted. The four high-level control points around the ball joint are used for orientation, and the center point of the lower ball joint is marked. A prism rod is set up at the center point of the ball joint, and leveling is performed for coarse adjustment. The coarse adjustment controls the plane position within ±3mm, and then fine adjustment is performed; the lower ball joint is connected to the frame with 8 hexagonal bolts. First, the horizontal axis direction data of the ball joint is measured, and the horizontal axis position of the ball joint is adjusted to the design value by a mechanical jack, and the two hexagonal bolts of the horizontal axis are tightened; then the vertical axis data of the ball joint is measured, and the longitudinal position of the ball joint is adjusted to the design value by a mechanical jack, and the two longitudinal hexagonal bolts are tightened until the deviation between the adjusted design ball joint center coordinate and the actual ball joint center coordinate value is lower than the preset value, and the hexagonal bolts are tightened to determine the plane position of the lower ball joint; Ball joint elevation control: After the plane position is fixed, the closed leveling method is used to determine the elevation of the top surface of the ball joint. The top surface of the lower ball joint is divided into 8 elevation points, and marks are made on the outer edge of the ball joint. An electronic level with an accuracy of 0.01mm and an indium tile ruler are set up for rough adjustment. The initial data is measured, and the elevation is controlled within ±1mm by adjusting the 4 hexagonal bolts in the horizontal and vertical directions; then the 8 direction points of the lower ball joint are fine-tuned. First, the elevation of the hexagonal bolts on the southwest and northwest sides of the horizontal axis are adjusted to the design value. At this time, the elevation of the due west side of the horizontal axis exceeds the design value, and the hexagonal bolts on the due west side are temporarily not moved; the hexagonal bolts on the southeast and northeast sides are adjusted, and the measurement and adjustment are carried out while the elevation is the design value. value, tighten the hexagonal bolts, measure the elevation of the due west side, adjust the hexagonal bolts on the due west side to make the lower ball joint to the design value, at this time, the 6 points in the horizontal axis direction meet the design requirements; adjust the elevation in the vertical axis direction, first measure the elevations of the two points on the south and north sides, and analyze the data. If the elevations on both sides exceed the design value, directly adjust the hexagonal bolts on both sides of the south side to make the ball joint to the design value; if the elevation on one side exceeds the design value, use a torque wrench to make slight adjustments to the hexagonal bolts at the southeast, southwest, northeast, and northwest points, and observe the elevation values ​​of the points on the south and north sides at the same time, adjust the design ball joint elevation and the actual ball joint elevation to less than 0.3mm, then tighten all the hexagonal bolts.

[0009] Furthermore, the installation and fine adjustment of the lower ball joint specifically includes: Re-measurement of the plane and elevation of the spherical joint: After the plane and elevation of the spherical joint are determined, the spherical joint is re-measured; the plane accuracy of the spherical joint system is re-measured using the "wire measurement" method, and the elevation is re-measured using the "elevation transfer" method. The measured results are adjusted and compared with the design coordinates and elevations. If they exceed the specifications, they need to be re-fine-tuned. If they meet the design requirements, the next construction process will be carried out.

[0010] Furthermore, the installation and fine adjustment of the lower ball joint specifically includes: Rebar binding: According to the size of the lower ball joint and steel frame in the design drawings, when binding the lower cap steel bars, reserve the installation opening of the ball joint steel frame in advance to avoid repeated operations; the lower ball joint steel bars are connected to the lower cap steel bars by welding; the lower ball joint steel bars are connected to the steel frame by welding; strictly abide by the requirements of the specifications to ensure that the lower cap steel bars, lower ball joint steel bars, and ball joint frame are connected to form a whole; After the steel bars are tied, re-measure the center, elevation and flatness of the ball joint; if they meet the accuracy requirements, pour concrete; if there are deviations, continue to adjust until they meet the accuracy requirements.

[0011] Furthermore, the installation and fine adjustment of the lower ball joint specifically includes: Pouring concrete: Use C50 micro-expanding epoxy concrete to pour the bottom of the lower ball joint; before pouring concrete, the lower ball joint needs to be covered to prevent stones and mud from splashing onto the lower ball joint; the lower ball joint should not be disturbed during the concrete pouring process, and the concrete within the ball joint range must be vibrated and compacted; the concrete inside the lower ball joint should be checked one by one for the compactness of the concrete in the lower ball joint exhaust hole. If it is not compact, re-vibrate it, and no bubbles or voids are allowed; to prevent debris from flowing back into the lower ball joint and causing the ball joint to rust, the finished surface of the concrete pouring should be 1 cm lower than the top surface of the lower ball joint; after pouring, the concrete should be covered and watered in strict accordance with the concrete maintenance specifications.

[0012] Furthermore, the upper ball joint is installed and fine-tuned, specifically including: Install the positioning pin: clean the lower ball joint positioning shaft sleeve and apply butter, apply butter to the positioning pin and put it into the lower ball joint positioning shaft sleeve; Install the upper ball joint: After the locating pin is installed, apply Teflon butter. After passing the inspection, install the upper ball joint and adjust the level. Perform a test turn on the upper ball joint and measure the center point of the upper ball joint to ensure that the error between the upper and lower ball joint center points is lower than the preset value. At the same time, remove the excess butter that is squeezed out and use a foaming agent to seal the gaps at the edges of the upper and lower ball joints to prevent debris from entering the friction part of the ball joint.

[0013] According to the second aspect, an embodiment provides a swivel bridge ball joint installation precision control construction system, wherein the ball joint is arranged between the upper bearing platform and the lower bearing platform of the swivel mechanism, the ball joint includes an upper ball joint and a lower ball joint, and a polyethylene sliding sheet is arranged between the upper ball joint and the lower ball joint, and the system includes: Polyethylene slide installation and fine adjustment module, used to install the polyethylene slide to the lower ball joint surface that meets the accuracy requirements before the ball joint is installed; The lower ball joint installation and fine adjustment module is used to accurately position the lower ball joint and install it to the center of the lower bearing platform using a high-precision control network and a high-precision measuring instrument; The upper ball joint installation and fine-tuning module is used for the installation and fine-tuning of the upper ball joint. An upper ball joint that meets the precision requirements is installed above the top surface of the lower ball joint, and the center position of the upper ball joint is fine-tuned so that the center of the circle is centered after the upper ball joint is installed.

[0014] The present application provides a construction method and system for controlling the installation accuracy of the ball joint of a rotating bridge, which is applicable to the installation of the ball joint of a rotating bridge of various types constructed by the horizontal rotation method. Whether it is the construction of a railway rotating bridge or a rotating bridge of a highway, river, canyon, etc., this method can be used to improve the installation accuracy of the ball joint and reduce the rotation error. It has the following beneficial effects: (1) By controlling the installation accuracy of the ball joint, the accuracy of the rotating bridge can be improved and the linear and angular errors of the joint section of the rotating bridge can be reduced.

[0015] (2) Compared with the commonly used precision control methods, this method simplifies the beam posture adjustment process and shortens the construction blockade time by improving and innovating the previous ball joint installation precision control process.

[0016] (3) Move the installation and fine-tuning of the PTFE slide outward to improve the installation efficiency of the ball joint system and reduce the construction time of the existing railway line.

[0017] (4) Reasonable resource matching, mature technology, high construction efficiency, strong operability, saving manpower and material resources and reducing construction costs.

[0018] (5) The construction is of high precision, the operation is safe and reliable, and the construction quality is effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart of a method for controlling the installation accuracy of a spherical joint of a swivel bridge provided by one embodiment of the present invention; Figure 2 A schematic diagram of a swivel ball joint structure in a swivel bridge ball joint installation precision control construction method provided by one embodiment of the present invention; Figure 3 A structural diagram of a swivel mechanism in a swivel bridge ball joint installation precision control construction method provided by one embodiment of the present invention; Figure 4 A swivel structure elevation view in a swivel bridge ball joint installation precision control construction method provided by one embodiment of the present invention; Figure 5 An overall construction process in a construction method for controlling the installation accuracy of a swivel bridge ball joint provided by an embodiment of the present invention; Figure 6 A schematic diagram of the arrangement of a swivel bridge ball joint and control points in a swivel bridge ball joint installation precision control construction method provided by one embodiment of the present invention; Figure 7 A schematic diagram of the installation of a polytetrafluoroethylene sliding plate in a method for controlling the installation accuracy of a swivel bridge ball joint provided by an embodiment of the present invention; Figure 8 A schematic diagram of the logical structure of a swivel bridge ball joint installation precision control construction system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0021] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0022] The first embodiment of the present invention provides a method for controlling the installation accuracy of a swivel bridge ball joint, wherein the ball joint is arranged between the upper support platform and the lower support platform of the swivel mechanism, and the ball joint includes an upper ball joint and a lower ball joint, and a polyethylene sliding plate is arranged between the upper ball joint and the lower ball joint. Figure 1 Provide detailed explanation.

[0023] like Figure 2 As shown, the principle of the swivel is to set a ball joint sliding device with a small friction coefficient between the upper and lower structures of the swivel, and adopt a rotating system with a steel ball joint as the main central support and an annular slideway as the auxiliary support.

[0024] like Figure 3 , Figure 4 As shown in the figure, the swivel structure consists of a swivel lower turntable, a ball joint, an upper turntable, a support leg, an annular slideway, a rotation traction system, etc. The lower ball joint is installed on the lower turntable, and the upper ball joint is fixed on the upper turntable. During the swivel construction, the jack pulls the traction rope to drive the upper turntable, and the upper ball joint rotates on the lower turntable along the central axis of the ball joint, finally realizing the swivel.

[0025] Process principle: The basic principle of this method is to use a high-level control network and high-precision measuring instruments to accurately position the ball joint system at the center point of the pedestal. The ball joint system is located between the upper and lower pedestals of the rotating bridge. A polytetrafluoroethylene sliding plate is installed between the upper and lower ball joints to reduce friction resistance. The upper turntable is pulled by a traction lock to rotate the upper pedestal, piers and beams to the designed angle. Through the high-precision control of the ball joint system installation, the linear, angle and elevation errors of the rotating bridge are reduced. The overall process is as follows: Figure 5 shown.

[0026] like Figure 1 As shown, in step S100, the polyethylene slide is installed and fine-tuned: before the ball joint is installed, the polyethylene slide is installed in advance to the lower ball joint surface that meets the accuracy requirements.

[0027] The above steps specifically include: The parameters of the polytetrafluoroethylene slide are φ60×18mm, each ball joint has 571 slides, and there are 4 ball joints, totaling 2284 slides. The installation process of the polytetrafluoroethylene slide is cumbersome and requires high precision, so before the positioning and installation of the lower ball joint, the polytetrafluoroethylene slide is installed in advance, saving manpower, material resources, and construction period, greatly shortening the construction time near the existing line, and reducing the impact on the driving of the existing line.

[0028] 1 PTFE Slide Installation When installing the PTFE slide, clean the top surface of the lower ball joint, ensure that there is no debris on the ball joint surface and in the hole where the PTFE slide is installed, and blow the ball surface clean. Figure 7 As shown, mark the number in the lower ball reaming hole, align the polytetrafluoroethylene slide with the number for installation, and fine-tune the polytetrafluoroethylene slide at the same time to ensure that each polytetrafluoroethylene slide is installed in one step without duplication of work.

[0029] 2 PTFE slide fine adjustment Fine adjustment uses a precision control network, an electronic level with an accuracy of 0.01mm, and an indium tile ruler. The "elevation transfer" method is used to measure the elevation of each polytetrafluoroethylene slide. Fine adjustments are made one by one from the center of the ball joint to the outside, while measuring and adjusting, to ensure that the elevation error of the polytetrafluoroethylene slide with the top surface on the same spherical surface is less than 0.2mm.

[0030] 3. Polytetrafluoroethylene Slide Retest After the installation and fine-tuning of the polytetrafluoroethylene slide is completed, the entire polytetrafluoroethylene slide needs to be re-measured. The "elevation transfer" method is still used to measure from the inside to the outside step by step. If it does not meet the design requirements, it will be directly adjusted and measured repeatedly until the elevation error is less than 0.2mm. If it meets the design requirements, the next process will be carried out.

[0031] In this method, the polytetrafluoroethylene sliding plate is installed and fixed in advance before the ball joint is installed, so as to advance the work, shorten the construction time of the adjacent operating line, reduce the impact on the operation of the existing line, reduce the investment of manpower and material resources, and save costs.

[0032] like Figure 1 As shown, in step S200, the lower ball joint is installed and fine-tuned: a high-precision control network and a high-precision measuring instrument are used to accurately position the lower ball joint and install it to the center of the lower support platform.

[0033] The above steps specifically include: 1. Lay out high-precision control network 1.1 Plane resurvey using satellite positioning static observation (1) The relative mean error of the side length between constraint points is ≤1 / 100000, and the relative mean error of the weakest side after constraint adjustment is ≤1 / 40000; (2) Fixed error a≤10mm, proportional error coefficient b≤10mm / km; (3) Repeated observation baseline length is poor mm; (4) Asynchronous loop closure error ; (5) Correction of unconstrained adjustment baseline components ≤ mm; (6) The correction numbers of constrained adjustment baseline components are different from those of unconstrained adjustment baseline components. ≤ mm.

[0034] Satellite positioning control network measurement technical requirements:

[0035] (7) The baseline accuracy between adjacent points in the GPS control network is calculated as follows:

[0036] In the formula —Standard deviation, i.e. the mean error of the chord length of the baseline vector (mm); a—Fixed error (mm) b—Proportional error coefficient (mm / km) d—the distance between adjacent points (km).

[0037] Calculation of measurement error in control network:

[0038] Where m is the measurement error of the control (mm); N—Number of asynchronous rings in the control network n—Number of edges in the asynchronous ring W—the total length closure error of the asynchronous ring number (mm).

[0039] 1.2 Height re-survey using national second-class leveling observation Main technical requirements for elevation control measurement:

[0040]

[0041] 1.3 Data adjustment and results 1) The accuracy statistics after three-dimensional unconstrained adjustment calculation are as follows:

[0042] From the statistical data of the three-dimensional unconstrained adjustment accuracy of the GPS control network, it can be seen that the baseline vector network itself has high internal accuracy, the baseline vector has no obvious systematic error and gross error, and the quality of the baseline vector network is reliable. On this basis, two-dimensional constrained adjustment can be carried out.

[0043] 2) Planar 2D Constrained Adjustment The adjustment results are shown in the following table:

[0044] After two-dimensional constrained adjustment, the mean error of the weakest point is 0.20cm, and the weakest side is 1 / 61000, which meets the limit error requirements of GPS fourth-order control measurement in the "Engineering Survey Specifications", and the adjustment results are reliable.

[0045] 3) Height adjustment Route point number: A025 S02 A23 A24 S03 S04 S05 S01 S12 S11 S09 S08 S06 S07 S10S13 C009 A018 Height difference closure error: -9.39 (mm) Total length: 4.21 (km) Tolerance: 24.61mm passed! Adjustment height difference

[0046] 4) Plane and elevation results table

[0047] Swivel bridge ball joint system, control point layout Figure 6 shown.

[0048] 2 Ball joint approach accuracy control The ball joint has a diameter of 3500mm, a thickness of 40mm, and a weight of 3.026t. The accuracy of the ball joint must be measured before it arrives on site, and it can only be installed if it meets the following design accuracy requirements.

[0049] 1) The surface roughness of the ball joint is less than Ra12.5μm; 2) The curvature of the spherical surface should be equal at all locations, and the difference in the radius of curvature should be ±0.5mm; 3) The difference in elevation between each edge point is ≤1mm; 4) The ellipticity of the ball joint is ≤1.5mm; 3 Ball joint plane control After the measurement is qualified, the lower ball joint is installed with a crane and fixed on the steel frame; at the same time, a precision control network and a precision total station with an accuracy of 0.5″ are used, and the “cross-line centering method” and “coordinate control method” are adopted. The four high-level control points around the ball joint are used for orientation, and the center point of the lower ball joint is marked. A prism rod is set up at the center point of the ball joint, and leveling is performed to perform coarse adjustment. The coarse adjustment controls the plane position within ±3mm, and then fine adjustment is performed.

[0050] The lower ball joint is connected to the frame with 8 hexagonal bolts (M20*130mm). First, measure the horizontal axis data of the ball joint, use a mechanical jack to adjust the horizontal axis position of the ball joint to the design value, and tighten the two hexagonal bolts of the horizontal axis; then measure the vertical axis data of the ball joint, use a mechanical jack to adjust the longitudinal position of the ball joint to the design value, and tighten the two longitudinal hexagonal bolts. Tighten the hexagonal bolts to determine the plane position of the lower ball joint until the deviation between the adjusted design ball joint center coordinate and the actual ball joint center coordinate value is less than 1mm.

[0051] 4 Ball joint elevation control After the plane position is fixed, the closed leveling method is used to determine the elevation of the top surface of the ball joint. The top surface of the lower ball joint is divided into 8 elevation points, and marks are made on the outer edge of the ball joint. An electronic level with an accuracy of 0.01mm and an indium tile ruler are set up for rough adjustment. The initial data is measured, and the elevation is controlled within ±1mm by adjusting the 4 hexagonal bolts in the horizontal and vertical directions; then the 8 direction points of the lower ball joint are fine-tuned. First, the elevation of the hexagonal bolts on the southwest and northwest sides of the horizontal axis are adjusted to the design value. At this time, the elevation on the due west side of the horizontal axis exceeds the design value, and the hexagonal bolts on the due west side are temporarily not moved; adjust the hexagonal bolts on the southeast and northeast sides, measure and adjust while adjusting, and when the elevation is the design value, tighten it. Hexagonal bolts. At this time, measure the elevation of the due west side and adjust the hexagonal bolts on the due west side to make the lower ball joint reach the design value. At this time, the six points in the horizontal axis direction meet the design requirements. Adjust the elevation in the vertical axis direction. First measure the elevations of the two points on the south and north sides, and perform data analysis. If the elevations on both sides exceed the design values, directly adjust the hexagonal bolts on both sides of the south side to make the ball joint reach the design value. If the elevation on one side exceeds the design value, use a torque wrench to make slight adjustments to the hexagonal bolts at the southeast, southwest, northeast, and northwest points. At the same time, observe the elevation values ​​of the points on the south and north sides, and adjust the design ball joint elevation to be less than 0.3mm from the actual ball joint elevation. At this time, tighten all hexagonal bolts.

[0052] 5. Spherical joint plane and elevation re-measurement After the plane and elevation of the ball joint are determined, the ball joint is re-measured. Since the swivel bridge is a parallel double-width swivel, in order to ensure the accuracy of the parallel double rotation, the plane uses the "wire measurement" method to re-measure the plane accuracy of the ball joint system, and the elevation uses the "elevation transfer" method to re-measure the elevation of the ball joint system. The measured results are adjusted and compared with the design coordinates and elevations. If they exceed the specification requirements, they need to be re-fine-tuned. If they meet the design requirements, the next process is carried out. In this way, while ensuring the accuracy of the ball joint, it can also ensure the error of the double-width swivel ball joint system, so that the two swivel systems form a whole.

[0053] 6. Tie the steel bars According to the design drawings, the size of the lower ball joint and steel frame should be reserved in advance when the lower bearing platform reinforcement is tied to avoid repeated operations. The lower ball joint reinforcement and the lower bearing platform reinforcement are connected by welding, and the welding length is greater than 10d; the lower ball joint reinforcement and the steel frame are connected by welding, and the welding length is greater than 10d; strictly abide by the requirements of the specifications to ensure that the lower bearing platform reinforcement, lower ball joint reinforcement, and ball joint frame are connected to form a whole.

[0054] After the reinforcement is tied, the center, elevation and flatness of the ball joint are remeasured; if they meet the accuracy requirements, concrete pouring is carried out; if there is any deviation, continue to adjust until it meets the accuracy requirements.

[0055] 7. Concrete pouring C50 micro-expansion epoxy concrete is used to cast the bottom of the lower ball joint and the bottom of the slideway. Micro-expansion epoxy concrete can offset the impact of ordinary concrete shrinkage on the ball joint; before pouring concrete, the lower ball joint should be covered to prevent stones and mud from splashing onto it; the lower ball joint should not be disturbed during the concrete pouring process, and the concrete within the ball joint range must be vibrated and compacted; the concrete inside the lower ball joint should be checked one by one for the compactness of the concrete in the lower ball joint exhaust hole. If it is not compacted, re-vibrate it, and bubbles and voids are not allowed; to prevent water, mud and other debris from flowing back into the lower ball joint, causing the ball joint to rust, the concrete pouring surface should be 1 cm lower than the top surface of the lower ball joint. After pouring, the concrete should be covered and watered in strict accordance with the concrete maintenance specifications.

[0056] like Figure 1 As shown, in step S300, the upper ball joint is installed and fine-tuned: the upper ball joint is installed and fine-tuned above the top surface of the lower ball joint that meets the precision requirements, and the center position of the upper ball joint is fine-tuned so that the center of the circle is centered after the upper ball joint is installed.

[0057] The above steps specifically include: 1. Installation of positioning pins The locating pin is a steel rod with a diameter of φ270mm. Clean the inside of the lower ball joint locating shaft sleeve and apply butter. Apply butter to the locating pin and put it into the lower ball joint locating shaft sleeve.

[0058] 2. Upper ball joint installation After the locating pin is installed, apply tetrafluoroethylene butter. After passing the inspection, install the upper ball joint, adjust the level, test turn the upper ball joint, measure the center point of the upper ball joint, and ensure that the error between the upper and lower ball joints is less than 1mm. At the same time, remove the excess butter that is squeezed out, and use a foaming agent to seal the gaps at the edges of the upper and lower ball joints to prevent water, mud and other debris from entering the friction part of the ball joint.

[0059] Construction near operating lines: The installation of the ball joint should be within 30m of the existing railway line, and large machinery such as cranes should be used for cooperation. It is a construction near the operating line, and the construction plan and construction scheme must be reported to the relevant departments of the Railway Bureau in advance. After approval, construction can be carried out with the cooperation of supervisory personnel from relevant departments.

[0060] On the day of construction, the station liaison officer went to the station in advance to register the construction information, waited for the construction schedule to start, and notified the on-site protection personnel before construction could begin. The technician led the ball joint installation team to enter the site to install the ball joint. After the installation was completed, the surveyor fine-tuned the plane and elevation of the ball joint. After the accuracy met the requirements, the next step of construction was carried out. After the construction was completed, the on-site personnel left the site and notified the station liaison officer to register and cancel. The site strictly abided by the "one machine, one person" protection principle.

[0061] Quality Control: 1Construction quality control standards Railway Bridge and Culvert Design Specifications (TB10002-2017); "Code for Design of Concrete Structures of Railway Bridges and Culverts" (TB10092-2017); "Design Specification for Durability of Railway Concrete Structures" (TB10005-2010); Engineering Surveying Specification (GB50026-2020); "Regulations on Construction Management of Railway Operating Lines" (Tieyun

[2012] No. 280); 2 Key points of construction quality control 2.1 The ball joint system needs to be inspected for quality upon arrival. The surface roughness, spherical curvature, elevation of each edge point and ellipticity of the ball joint must be measured. The next construction process can only be carried out after the design requirements are verified.

[0062] 2.2 The layout of the precision control network strictly abides by the measurement procedures and is carried out by professional measurement engineers. After the control network is laid out, it is reviewed with precision instruments. If it does not meet the accuracy requirements, the control network is re-measured.

[0063] 2.3 When installing the ball joint, precise measurements must be made and repeated checks must be made to determine the plane position of the ball joint and the flatness of the top surface of the ball joint.

[0064] 2.4 When installing the PTFE slide, the ball joint hole must be clean, and the installation and fine adjustment must be carried out strictly according to the design requirements.

[0065] 2.5 Steel bars entering the site must have a material list and certificate provided by the manufacturer; each batch entering the site must be inspected; steel bars must be sampled in batches according to the test procedures and can only be used after passing the laboratory inspection.

[0066] 2.6 When pouring concrete in layers, it must be vibrated to make it dense. The vibrating rod is not allowed to contact the ball joint system during vibration. After pouring, watering and curing must be carried out in time, and the curing period shall not be less than 7 days.

[0067] Application examples: In the Hohhot S43 Airport Expressway Shibugeng Interchange Project, there are 4 ramps crossing the Tangbao Railway, including Ramp B (62m+62m), Ramp C (70m+70m), Ramp E (70m+70m), and Ramp F (70m+70m). Tangbao Railway is a Class I trunk railway of the national railway, with busy freight and large traffic volume. Therefore, the 4 ramps of this project all adopt the rotating bridge construction technology. By applying this construction method to the 4 rotating bridges of this project, the accuracy of the rotating bridge is improved, the construction period is saved, the impact time of the construction on the existing line is reduced, the construction safety factor is improved, the project benefits are good, and the social benefits are significant.

[0068] This construction method uses the ball joint system to assist the bridge structure to rotate across the Tangbao Railway. Compared with the previous continuous beam hanging basket construction, steel truss beam jacking construction, and rotating bridge ball joint construction technology, it is safe and reliable, simple to operate, and fast to implement. It not only shortens the bridge construction period, but also improves the construction safety. It has been unanimously affirmed by the owner, railway bureau, design unit, supervision unit and other relevant departments. It can be widely used in the installation and construction of various types of rotating bridge ball joint systems with flat rotation method, with significant social benefits.

[0069] Corresponding to the above-disclosed construction method for precision control of ball joint installation of a swivel bridge, the embodiment of the present invention further discloses a construction system for precision control of ball joint installation of a swivel bridge, wherein the ball joint is arranged between the upper support platform and the lower support platform of the swivel mechanism, the ball joint comprises an upper ball joint and a lower ball joint, and a polyethylene sliding sheet is arranged between the upper ball joint and the lower ball joint, such as Figure 8 As shown, it specifically includes: Polyethylene slide installation and fine adjustment module, used to install the polyethylene slide to the lower ball joint surface that meets the accuracy requirements before the ball joint is installed; The lower ball joint installation and fine adjustment module is used to accurately position the lower ball joint and install it to the center of the lower bearing platform using a high-precision control network and a high-precision measuring instrument; The upper ball joint installation and fine-tuning module is used for the installation and fine-tuning of the upper ball joint. An upper ball joint that meets the precision requirements is installed above the top surface of the lower ball joint, and the center position of the upper ball joint is fine-tuned so that the center of the circle is centered after the upper ball joint is installed.

[0070] It should be noted that the detailed description of a swivel bridge ball joint installation precision control construction system provided in an embodiment of the present invention can refer to the relevant description of a swivel bridge ball joint installation precision control construction method provided in an embodiment of the present application, which will not be repeated here.

[0071] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A construction method for controlling the installation accuracy of a swivel bridge ball joint, characterized in that: The ball joint is arranged between the upper support platform and the lower support platform of the swivel mechanism, the ball joint comprises an upper ball joint and a lower ball joint, a polyethylene sliding sheet is arranged between the upper ball joint and the lower ball joint, and the method comprises: Installation and fine adjustment of polyethylene slide: Before installing the ball joint, install the polyethylene slide to the lower ball joint surface that meets the accuracy requirements; Installation and fine adjustment of the lower ball joint: Use a high-precision control network and a high-precision measuring instrument to accurately position the lower ball joint and install it to the center of the lower bearing platform; Installation and fine-tuning of the upper ball joint: Install an upper ball joint that meets the precision requirements above the top surface of the lower ball joint, and fine-tune the center position of the upper ball joint so that the center of the circle is centered after the upper ball joint is installed.

2. A construction method for controlling the installation accuracy of a swivel bridge ball joint as claimed in claim 1, characterized in that: Before the lower ball joint is installed and fine-tuned, the method further includes: Lay out a high-precision control network: the plane re-survey adopts satellite positioning static observation, and the elevation re-survey adopts national second-class leveling observation.

3. A construction method for controlling the installation accuracy of a swivel bridge ball joint as claimed in claim 1, characterized in that: Installation and fine adjustment of polyethylene slides, including: Installation of PTFE slides: When installing PTFE slides, clean the top surface of the lower ball joint to ensure that there are no debris on the ball joint surface and in the hole where the PTFE slides are installed, and blow the spherical surface clean; mark the numbers in the holes of the lower ball joint, align the PTFE slides with the numbers and install them, and fine-tune the PTFE slides at the same time to ensure that each PTFE slide is installed in one step without duplication of work; Fine adjustment of polytetrafluoroethylene slide: fine adjustment uses precision control network, electronic level and indium tile ruler, and uses the "elevation transfer" method to measure the elevation of each polytetrafluoroethylene slide, and fine adjustment is performed one by one from the center of the spherical joint to the outside, while measuring and adjusting, to ensure that the elevation error of the polytetrafluoroethylene slide with the top surface on the same spherical surface is lower than the preset value.

4. A construction method for controlling the installation accuracy of a swivel bridge ball joint as claimed in claim 3, characterized in that: Polyethylene slide installation and fine adjustment, including: Re-measurement of PTFE slide: After the installation and fine-tuning of the PTFE slide is completed, the entire PTFE slide is re-measured, and the "elevation transfer" method is still used to measure from the inside to the outside step by step. If it does not meet the design requirements, it will be directly adjusted and the measurement will be repeated until the elevation error is lower than the preset value. If it meets the design requirements, the next process will be carried out.

5. The method for controlling the installation accuracy of a swivel bridge ball joint according to claim 1, characterized in that: Installation and fine adjustment of the lower ball joint, including: Ball joint plane control: After the ball joint accuracy measurement is qualified, the lower ball joint is installed with a crane and fixed on the steel frame; at the same time, the precision control network and precision total station are used, and the "cross line centering method" and "coordinate control method" are adopted. The four high-level control points around the ball joint are used for orientation, and the center point of the lower ball joint is marked. A prism rod is set up at the center point of the ball joint, and leveling is performed to perform coarse adjustment. The coarse adjustment controls the plane position within the preset range, and then fine adjustment is performed; the lower ball joint and the frame are connected with 8 hexagonal bolts. First, the horizontal axis direction data of the ball joint is measured, and the horizontal axis position of the ball joint is adjusted to the design value by a mechanical jack, and the two hexagonal bolts of the horizontal axis are tightened; then the vertical axis data of the ball joint is measured, and the longitudinal position of the ball joint is adjusted to the design value by a mechanical jack, and the two longitudinal hexagonal bolts are tightened until the deviation between the adjusted design ball joint center coordinate and the actual ball joint center coordinate value is lower than the preset value, and the hexagonal bolts are tightened to determine the plane position of the lower ball joint; Ball joint elevation control: After the plane position is fixed, the closed leveling method is used to determine the elevation of the top surface of the ball joint. The top surface of the lower ball joint is divided into 8 elevation points, and marks are made on the outer edge of the ball joint. An electronic level and an indium tile ruler are set up for rough adjustment. The initial data is measured, and the elevation is controlled within the preset range by adjusting the 4 hexagonal bolts in the horizontal and vertical directions; then the 8 direction points of the lower ball joint are fine-tuned. First, the elevation of the hexagonal bolts on the southwest and northwest sides of the horizontal axis are adjusted to the design value. At this time, the elevation on the due west side of the horizontal axis exceeds the design value, and the hexagonal bolts on the due west side are temporarily not moved; the hexagonal bolts on the southeast and northeast sides are adjusted while measuring and adjusting. When the elevation is the design value, tighten it. Hexagonal bolts. At this time, measure the elevation of the due west side and adjust the hexagonal bolts on the due west side to make the lower ball joint reach the design value. At this time, the six points in the horizontal axis direction meet the design requirements. Adjust the elevation in the vertical axis direction. First measure the elevations of the two points on the south and north sides, and perform data analysis. If the elevations on both sides exceed the design values, directly adjust the hexagonal bolts on both sides of the south side to make the ball joint reach the design value. If the elevation on one side exceeds the design value, use a torque wrench to make slight adjustments to the hexagonal bolts at the southeast, southwest, northeast, and northwest points. At the same time, observe the elevation values ​​of the points on the south and north sides, adjust the design ball joint elevation and the actual ball joint elevation to be less than the preset value, and tighten all hexagonal bolts at this time.

6. A construction method for controlling the installation accuracy of a swivel bridge ball joint as claimed in claim 5, characterized in that: Installation and fine adjustment of the lower ball joint, including: Re-measurement of the plane and elevation of the spherical joint: After the plane and elevation of the spherical joint are determined, the spherical joint is re-measured; the plane accuracy of the spherical joint system is re-measured using the "wire measurement" method, and the elevation of the spherical joint system is re-measured using the "elevation transfer" method. The measured results are adjusted and compared with the design coordinates and elevations. If they exceed the specifications, they need to be re-fine-tuned. If they meet the design requirements, the next construction process will be carried out.

7. A construction method for controlling the installation accuracy of a swivel bridge ball joint as claimed in claim 6, characterized in that: Installation and fine adjustment of the lower ball joint, including: Rebar binding: According to the size of the lower ball joint and steel frame in the design drawings, when binding the lower cap steel bars, reserve the installation opening of the ball joint steel frame in advance to avoid repeated operations; the lower ball joint steel bars are connected to the lower cap steel bars by welding; the lower ball joint steel bars are connected to the steel frame by welding; strictly abide by the requirements of the specifications to ensure that the lower cap steel bars, lower ball joint steel bars, and ball joint frame are connected to form a whole; After the reinforcement is tied, re-measure the center, elevation and flatness of the ball joint; if it meets the accuracy requirements, pour concrete; if there is a deviation, continue to adjust until it meets the accuracy requirements.

8. A construction method for controlling the installation accuracy of a swivel bridge ball joint as claimed in claim 7, characterized in that: Installation and fine adjustment of the lower ball joint, including: Pouring concrete: Use C50 micro-expanding epoxy concrete to pour the bottom of the lower ball joint; before pouring concrete, the lower ball joint needs to be covered to prevent stones and mud from splashing onto the lower ball joint; the lower ball joint should not be disturbed during the concrete pouring process, and the concrete within the ball joint range must be vibrated and compacted; the concrete inside the lower ball joint should be checked one by one for the compactness of the concrete in the lower ball joint exhaust hole. If it is not compact, re-vibrate it, and no bubbles or voids are allowed; to prevent debris from flowing back into the lower ball joint and causing the ball joint to rust, the finished concrete pouring surface should be lower than the preset value of the lower ball joint top surface; after pouring, the concrete should be covered and watered in strict accordance with the concrete maintenance specifications.

9. A construction method for controlling the installation accuracy of a swivel bridge ball joint as claimed in claim 1, characterized in that: Installation and fine adjustment of the upper ball joint, including: Install the positioning pin: clean the lower ball joint positioning shaft sleeve and apply butter, apply butter to the positioning pin and put it into the lower ball joint positioning shaft sleeve; Install the upper ball joint: After the locating pin is installed, apply Teflon butter. After passing the inspection, install the upper ball joint and adjust the level. Perform a test turn on the upper ball joint and measure the center point of the upper ball joint to ensure that the error between the upper and lower ball joint center points is lower than the preset value. At the same time, remove the excess butter that is squeezed out and use a foaming agent to seal the gaps at the edges of the upper and lower ball joints to prevent debris from entering the friction part of the ball joint.

10. A swivel bridge ball joint installation precision control construction system, characterized in that: The ball joint is arranged between the upper support platform and the lower support platform of the swivel mechanism, the ball joint comprises an upper ball joint and a lower ball joint, a polyethylene sliding sheet is arranged between the upper ball joint and the lower ball joint, and the system comprises: Polyethylene slide installation and fine adjustment module, used to install the polyethylene slide to the lower ball joint surface that meets the accuracy requirements before the ball joint is installed; The lower ball joint installation and fine adjustment module is used to accurately position the lower ball joint and install it to the center of the lower bearing platform using a high-precision control network and a high-precision measuring instrument; The upper ball joint installation and fine-tuning module is used for the installation and fine-tuning of the upper ball joint. An upper ball joint that meets the precision requirements is installed above the top surface of the lower ball joint, and the center position of the upper ball joint is fine-tuned so that the center of the circle is centered after the upper ball joint is installed.

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