Installation and construction method for arch rib of tied-arch bridge of high-speed railway

Abstract

The invention discloses a high-speed railway tied-arch bridge arch rib installation construction method which comprises an arch rib, the cross section of the arch rib is dumbbell-shaped, and the arch rib comprises an upper chord pipe, a lower chord pipe and a web arranged between the upper chord pipe and the lower chord pipe and used for connecting the upper chord pipe and the lower chord pipe; the method comprises the following steps: processing arch ribs in a factory, transporting all the arch ribs to a construction site, arranging a bracket on a poured bridge floor, arranging a mounting platform on the top surface of the bracket, arranging a fixing mechanism on the top surface of the mounting platform, hoisting the arch ribs to a preset position under hoisting of a crane for alignment measurement, and releasing hoisting points after the measurement is correct. The fixing mechanism adjusts the position of the arch rib and then performs on-site welding; the arch ribs are manufactured in a factory in advance, the arch ribs are prevented from being cut on a construction site, the corresponding arch ribs are directly hoisted in sequence, hoisting points are loosened after accurate alignment, and direct welding is conducted, so that the manufacturing precision of the arch bridge is improved.

Description

Technical Field

[0001] The present application relates to the technical field of arch bridge construction, and in particular to an arch rib installation construction method for a high-speed railway tied arch bridge. Background Art

[0002] With the rapid advancement of national infrastructure construction, high-speed railways, as an important part of modern transportation, have immeasurable value in ensuring the sustainable development of social economy and improving the convenience of people's travel; high-speed railway tied arch bridges, as an efficient, economical and structurally beautiful bridge form, occupy a pivotal position in high-speed railway construction; tied arch bridges are a type of bridge structure that combines the advantages of arch bridges and beam bridges. They not only have the larger span capacity of arch bridges, but also have the strong adaptability of beam bridges to foundations. Therefore, they are widely used in many cases; arch ribs are the main load-bearing components of tied arch bridges, usually in the shape of arcs or curves, connecting the two ends of the bridge and supporting the bridge deck through tie rods.

[0003] During the construction of a tied arch bridge, arch ribs need to be installed. Traditionally, the arch ribs of tied arch bridges are made by on-site cutting and welding.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the arch ribs are cut and welded on-site and the manufacturing precision is poorly controlled. Summary of the invention

[0005] The purpose of this application is to provide a construction method for installing the arch ribs of a high-speed railway tied arch bridge, so as to improve the problems of on-site cutting and welding of the arch ribs and poor control of manufacturing precision.

[0006] The present application provides a method for installing the arch ribs of a high-speed railway tied arch bridge, which adopts the following technical solution: The invention discloses an arch rib installation construction method for a high-speed railway tied arch bridge, comprising an arch rib, wherein the cross section of the arch rib is dumbbell-shaped, and comprises an upper chord tube, a lower chord tube, and a web plate arranged between the upper chord tube and the lower chord tube and welded to connect the upper chord tube and the lower chord tube; the arch rib is processed in a factory, and all the arch ribs are transported to a construction site, a bracket is arranged on the cast bridge deck, a mounting platform is arranged on the top surface of the bracket, and a fixing mechanism is arranged on the top surface of the mounting platform, and the arch rib is hoisted to a predetermined position by a crane for alignment measurement, and the hoisting point is released after the measurement is correct, and the fixing mechanism is used to adjust the position of the arch rib for on-site welding.

[0007] By adopting the above technical solution, the manufacture of the arch ribs is completed in the factory in advance, avoiding the cutting of the arch ribs at the construction site. The corresponding arch ribs are directly hoisted in sequence, and after accurate alignment, the hoisting points are loosened and directly welded, thereby improving the manufacturing accuracy of the arch bridge.

[0008] Optionally, the upper chord tube, the lower chord tube and the web are made of steel plates which are derusted and rolled into single-section tubes in a factory, and longitudinal circumferential seam welding is performed by submerged arc automatic welding.

[0009] By adopting the above technical scheme, the upper chord tube, the lower chord tube and the web are formed by curling the rust-removed steel plate, thereby improving their strength. At the same time, it is convenient to weld the upper chord tube, the lower chord tube and the web together by longitudinal circumferential seam welding through submerged arc automatic welding, thereby improving the strength of the arch rib and the manufacturing accuracy.

[0010] Optionally, the web is cut by a CNC cutting machine, precisely cut according to the corrected catenary, prefabricated with a butt groove, and assembled in segmented units in a factory using automated welding.

[0011] By adopting the above technical solution, CNC cutting machines can accurately cut materials according to the corrected catenary curve, which can ensure cutting accuracy, reduce human errors, and ensure that the size and shape of each segment meet the design standards, which is beneficial to improving the overall stability and safety of the arch bridge, while improving cutting efficiency and shortening the production cycle; the use of automated welding technology can carry out planar assembly and welding of segmented units in the factory, reduce manual operations, and improve welding quality and consistency.

[0012] Optionally, a visual inspection is carried out 24 hours after the arch rib welding to check the actual size of the weld, the presence of pores, undercuts, slag inclusions, cracks, weld bumps, burn-throughs, and unfused and incomplete grooves on the surface; then, based on the visual inspection, internal quality inspections such as 100% ultrasonic testing and 10% X-ray testing are carried out according to design requirements. After passing the inspection, anti-corrosion spraying is carried out.

[0013] By adopting the above technical solutions, the appearance defects of the arch ribs may affect the structural strength and durability. Immediate inspection of the appearance of the arch ribs can help to immediately discover the appearance defects of the arch ribs and avoid transporting the arch ribs with unqualified appearance to the construction site for hoisting; Ultrasonic flaw detection is a non-destructive testing method that can detect defects inside the weld, such as lack of fusion, lack of penetration, pores and inclusions; 100% ultrasonic flaw detection can fully cover all welds to ensure that the internal quality meets the design requirements; X-ray flaw detection is also a non-destructive testing method that can provide high-resolution images of the inside of the weld to detect more subtle defects; 10% X-ray flaw detection can focus on key areas to further ensure internal quality.

[0014] Optionally, the fixing mechanism includes a buffer placement component and a clamping and fixing component, the buffer placement component includes a box body with a built-in cavity, a fixing column is arranged at the center position of the bottom surface of the box body along the up-down direction, a guide column is arranged transversely on the fixing column, two buffer sleeves are slidably arranged on both sides of the guide column, two driven sleeves are slidably arranged on both sides of the fixing column, a transmission rod for transmitting motion is arranged between adjacent buffer sleeves and driven sleeves, and two ends of the transmission rod are rotatably connected to the buffer sleeve and the driven sleeve respectively; An output rod slidably connected to the guide column is arranged at one end of the driven sleeve away from the fixed column, and a buffer hydraulic cylinder is arranged on the inner walls of both sides of the box body corresponding to the output rod, and the output rod is slidably connected to the buffer hydraulic cylinder, and a first pressure plate is arranged in an annular manner at one end of the output rod away from the buffer hydraulic cylinder, and an oil inlet electromagnetic switch which can be pressed against the first pressure plate to be opened is arranged at one end of the buffer hydraulic cylinder facing the first pressure plate; A placement mold adapted to the arch rib is arranged above the box body, and a connecting rod penetrating the box body and fixedly connected to the top of the buffer sleeve at a higher horizontal position is arranged on the bottom surface of the placement mold; The clamping and fixing components are arranged on both sides of the placing mold, and the clamping and fixing components include a fixing plate and a group of clamping hydraulic cylinders arranged on the side of the fixing plate close to the arch rib, a group of clamping hydraulic cylinders are commonly provided with a pressure plate at the output end, a group of telescopic rods are provided on the side of the pressure plate close to the arch rib, and a backing plate against the web is provided at one end of the telescopic rod away from the pressure plate, and a pressure relief spring is provided on the outer sleeve of the telescopic rod; A sliding rod penetrating the pressing plate is fixedly arranged on one side of the abutment plate close to the pressing plate, an oil-closing electromagnetic switch is arranged on one side of the pressing plate away from the abutment plate, and the sliding rod is provided with a second pressure plate that presses against the oil-closing electromagnetic switch when the abutment plate is not in contact with the arch rib, and the oil-closing electromagnetic switch is in a closed state when pressed; The fixing plate is provided with an oil pipe connected to the clamping hydraulic cylinder, and the oil pipe is provided with an electromagnetic valve pressed open by an oil inlet electromagnetic switch. The electromagnetic valve is closed by releasing the oil closing electromagnetic switch when the electromagnetic valve is open.

[0015] By adopting the above technical scheme, the arch rib is clamped and fixed stably by setting a fixing mechanism, which is convenient for welding; the arch rib is stably placed by setting a buffer placement component to protect the arch rib from damage; the arch rib is fixed by setting a placement mold adapted to the arch rib; the placing mold is pressed down to the buffer sleeve by setting a connecting rod synchronously, and the buffer sleeve transmits the movement to the driven sleeve through the transmission rod, and part of the arch rib impulse is consumed during the transmission process; the movement of the driven sleeve is relieved by setting a buffer hydraulic cylinder to keep the arch rib stably pressed down until the limit plate is against the rubber pad on the upper surface of the box body, the first pressure plate presses to open the solenoid valve, the clamping hydraulic cylinder feeds oil, the clamping hydraulic cylinder drives the pressure plate to move, the push plate is against the arch rib, the pressure relief spring is compressed, the pressure relief spring helps to improve the stable clamping of the push plate and the arch rib, thereby improving the stability of the arch rib clamping and fixing, the pressure relief spring is compressed, the sliding rod moves, the second pressure plate releases the oil-closing electromagnetic switch, the oil-closing electromagnetic switch is turned on, the clamping hydraulic cylinder stops feeding oil, and the clamping hydraulic rod keeps stably clamping the arch rib, which is convenient for welding.

[0016] Optionally, a cavity is provided in the connecting rod, and a buffer spring is provided in the cavity, with two ends thereof being fixedly connected to the top surface of the fixing column and the connecting rod respectively.

[0017] By adopting the above technical solution, a buffer spring is provided to further alleviate the downward impulse of the placement mold when the arch rib is placed in the placement mold, thereby protecting the buffer placement component and the arch rib.

[0018] Optionally, a limit plate is provided on the bottom surface of the placement mold, the clamping and fixing components are fixed at both ends of the limit plate, and a rubber pad is provided on the top surface of the box body corresponding to the limit plate.

[0019] By adopting the above technical solution, by setting a limit plate to fix the clamping component to both sides of the arch rib, and at the same time increasing the contact area between the placement mold and the top surface of the box body after the arch rib is placed, the placement stability of the placement mold is improved; by setting a rubber pad to make the limit plate and the box body flexibly contact, the stability of the placement mold is improved while protecting the limit plate and reducing damage to the limit plate.

[0020] Optionally, after the arch ribs of each section are installed, the construction of the next section can be carried out only after the monitoring work is completed and the results are confirmed to be correct. The arch rib linear shape is measured regularly, and the arch rib linear shape diagram is drawn and compared with the designed arch rib linear shape to guide on-site adjustments.

[0021] By adopting the above technical solution, by regularly measuring the linear shape of the arch ribs, the actual status of the construction process can be mastered in real time to ensure the installation accuracy of each segment; this helps to timely discover and correct deviations, avoid error accumulation, and ensure that the linear shape of the overall structure meets the design requirements; by comparing the measured linear shape of the arch ribs with the designed linear shape, the construction quality can be intuitively evaluated to ensure that the installation position and angle of each segment are accurate; by comparing the linear shape diagram of the arch ribs with the designed linear shape, deviations can be discovered in time, and necessary adjustments and corrections can be guided on site; this dynamic adjustment mechanism can effectively avoid structural problems caused by construction errors and ensure the overall linear shape and force performance of the arch bridge; through monitoring and comparison, potential problems such as deformation and displacement can be discovered in time. This early warning mechanism can effectively prevent emergencies during construction and avoid structural failure or safety accidents caused by accumulated problems.

[0022] Optionally, a BIM model is used to simulate and analyze the stiffness, foundation support and stability of the support during the arch rib erection process to ensure the safety of the support construction.

[0023] By adopting the above technical solutions and through simulation analysis of the BIM model, the risks that the support may face during the construction process can be identified in advance, such as support deformation, foundation settlement or instability. This early risk assessment helps to formulate corresponding preventive measures, ensure construction safety, and improve linear control accuracy by 20%.

[0024] In summary, the present application includes at least the following beneficial technical effects of the construction method for installing the arch rib of a high-speed railway tied arch bridge: 1. The arch ribs are manufactured in the factory in advance to avoid cutting them at the construction site. The corresponding arch ribs are hoisted in sequence directly. After accurate alignment, the hoisting points are released and welded directly, which improves the manufacturing accuracy of the arch bridge; 2. The arch rib is clamped and fixed stably by setting a fixing mechanism to facilitate welding; the arch rib is stably placed by setting a buffer placement component to protect the arch rib from damage; the arch rib is fixed by setting a placement mold that matches the arch rib; the downward pressure movement of the placement mold is synchronously transmitted to the buffer sleeve by setting a connecting rod; the buffer sleeve transmits the movement to the driven sleeve through the transmission rod, and part of the arch rib impulse is consumed during the transmission process; the movement of the driven sleeve is relieved by setting a buffer hydraulic cylinder to keep the arch rib stable and pressed down, until the limit plate is against the rubber pad on the upper surface of the box body, the first pressure plate presses to open the solenoid valve, the clamping hydraulic cylinder is fed with oil, the clamping hydraulic cylinder drives the pressure plate to move, the plate is against the arch rib, and the pressure relief spring is compressed. The pressure relief spring helps to improve the stable clamping of the plate and the arch rib, thereby improving the stability of the arch rib clamping and fixing, the pressure relief spring is compressed, the sliding rod moves, the second pressure plate releases the oil-closing electromagnetic switch, the oil-closing electromagnetic switch is turned on, the clamping hydraulic cylinder stops feeding oil, and the clamping hydraulic rod keeps stably clamping the arch rib for easy welding; 3. By regularly measuring the linear shape of the arch ribs, the actual status of the construction process can be mastered in real time to ensure the installation accuracy of each segment; this helps to promptly discover and correct deviations, avoid error accumulation, and ensure that the linear shape of the overall structure meets the design requirements; by comparing the measured linear shape of the arch ribs with the designed linear shape, the construction quality can be intuitively evaluated to ensure that the installation position and angle of each segment are accurate; by comparing the linear shape diagram of the arch ribs with the designed linear shape, deviations can be discovered in a timely manner, and necessary adjustments and corrections can be guided on site; this dynamic adjustment mechanism can effectively avoid structural problems caused by construction errors and ensure the overall linear shape and force performance of the arch bridge; through monitoring and comparison, potential problems such as deformation and displacement can be discovered in a timely manner. This early warning mechanism can effectively prevent emergencies during construction and avoid structural failure or safety accidents caused by accumulated problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the present invention after the arch ribs are built and welded; Figure 2 is a schematic diagram for reflecting the structure of the fixing mechanism in the embodiment; Figure 3 yes Figure 2 A magnified schematic diagram of the structure at center A; Figure 4 It is a schematic diagram for reflecting the structure of the buffer placement component in the embodiment.

[0026] Figure 5 It is a cross-sectional schematic diagram of the overall structure of the fixing mechanism.

[0027] In the figure, 1, arch rib; 101, upper chord tube; 102, lower chord tube; 103, web; 2, bracket; 21, mounting platform; 3, fixing mechanism; 4, buffer placement assembly; 41, box body; 42, fixing column; 43, guide column; 44, buffer sleeve; 441, transmission rod; 442, placement mold; 45, driven sleeve; 46, connecting rod; 47, output rod; 48, buffer hydraulic cylinder; 49, first pressure plate; 491, oil inlet electromagnetic switch; 5, clamping and fixing assembly; 51, fixing plate; 52, clamping hydraulic cylinder; 53, pressure plate; 54, telescopic rod; 55, abutment plate; 56, pressure relief spring; 57, sliding rod; 58, oil closing electromagnetic switch; 59, second pressure plate; 6, oil pipe; 61, solenoid valve; 7, buffer spring; 8, limit plate; 81, rubber pad. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 -Attached Figure 5 , further details of this application are given.

[0029] High-speed railway tied arch bridge arch rib installation construction method, refer to Figure 1, including an arch rib 1, the cross section of the arch rib 1 is dumbbell-shaped, including an upper chord tube 101, a lower chord tube 102, and a web 103 arranged between the upper chord tube 101 and the lower chord tube 102 to connect the upper chord tube 101 and the lower chord tube 102; the upper chord tube 101, the lower chord tube 102, and the web 103 are made of steel plates that are derusted and rolled into single-section tubes in the factory, and longitudinal circumferential seam welding is performed by submerged arc automatic welding; the web 103 is precisely cut according to the corrected catenary by a CNC cutting machine, and a butt groove is prefabricated, and the segmented unit plane is assembled in the factory, and automatic welding is adopted; 24 hours after the arch rib 1 is welded, an appearance inspection is first performed to check the actual size of the weld, whether there are pores, undercuts, slag inclusions, cracks, weld bumps, burn-throughs, and unfused and unfilled grooves on the surface; then On the basis of appearance inspection, internal quality inspections such as 100% ultrasonic flaw detection and 10% X-ray flaw detection are carried out according to design requirements; the quality of ultrasonic flaw detection of internal quality of welds shall comply with the requirements of "Manual Ultrasonic Flaw Detection Method and Flaw Detection Result Classification of Steel Welds" (GB11345-89); after the quality inspection of welds and assembled parts is qualified, anti-corrosion spraying is carried out, and measures are taken to ensure the quality of painting, and the construction is not carried out under strong sunlight; the parts not to be painted indicated in the construction drawings shall not be painted, and 30-50mm shall be reserved for the installation welds for the time being; the painting shall be uniform, without obvious wrinkles, sagging, and good adhesion; the primer and intermediate paint shall be flat and uniform, and the paint film shall be free of bubbles, cracks, serious sagging, shedding, missing paint and other defects; in addition to meeting the above requirements, the color of the topcoat shall be consistent with the color chart; All the processed arch ribs 1 are transported to the construction site, and brackets 2 are arranged on the cast bridge deck. An installation platform 21 is arranged on the top surface of the bracket 2, and a fixing mechanism 3 is arranged on the top surface of the installation platform 21. Under the lifting of the crane, the arch rib 1 is lifted to the predetermined position for alignment measurement, and two cranes standing diagonally are used to lift the arch rib 1 at the same time to prevent rollover. After the measurement is correct, the lifting point is loosened, and the fixing mechanism 3 adjusts the position of the arch rib 1 and then welds it on site; after the installation of each segment of the arch rib 1 is completed, the construction of the next segment can be carried out after the monitoring work is completed and the results are confirmed to be correct, the linear shape of the arch rib 1 is measured regularly, and the linear shape diagram of the arch rib 1 is drawn and compared with the designed linear shape of the arch rib 1 to guide the on-site adjustment; the BIM model is used to simulate and analyze the stiffness of the bracket 2, the basic support and stability of the bracket 2 during the erection of the arch rib 1 to ensure the safety of the construction of the bracket 2.

[0030] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5The fixing mechanism 3 includes a buffer placement component 4 and a clamping and fixing component 5. The buffer placement component 4 includes a box body 41 with a built-in cavity. A fixed column 42 is arranged at the center of the bottom surface of the box body 41 in the up-down direction. A guide column 43 is horizontally welded at the center of the fixed column 42. Two buffer sleeves 44 are slidably arranged on both sides of the fixed column 42. Two driven sleeves 45 are slidably arranged on both sides of the guide column 43. A transmission rod 441 for transmitting movement is arranged between adjacent buffer sleeves 44 and driven sleeves 45. Both ends of the transmission rod 441 are rotatably connected with the buffer sleeve 44 and the driven sleeve 45 respectively. Specifically, the sliding of the buffer sleeve 44 on the fixed column 42 can synchronously drive the driven sleeve 45 to slide on the guide column 43. An output rod 47 slidably connected to the guide column 43 is provided at one end of the driven sleeve 45 away from the fixed column 42, and a cavity is built in the output rod 47 so that it can slide on the guide column 43. Buffer hydraulic cylinders 48 are provided on the inner walls of both sides of the box body 41 corresponding to the output rod 47. The output rod 47 is slidably connected to the buffer hydraulic cylinder 48 to buffer the movement of the output rod 47 away from the fixed column 42. A first pressure plate 49 is provided in an annular manner at one end of the output rod 47 away from the buffer hydraulic cylinder 48. An oil inlet electromagnetic switch 491 that can be pressed against by the first pressure plate 49 to open the buffer hydraulic cylinder 48 is provided at one end of the buffer hydraulic cylinder 48 facing the first pressure plate 49. A placement mold 442 adapted to the arch rib 1 is arranged above the box body 41, and a connecting rod 46 penetrating the box body 41 and fixedly connected to the top of a buffer sleeve 44 at a higher horizontal position is arranged on the bottom surface of the placement mold 442; a cavity is arranged in the connecting rod 46, and a buffer spring 7 is arranged in the cavity with two ends respectively fixedly connected to the top surface of the fixed column 42 and the connecting rod 46. When the arch rib 1 is placed in the placement mold 442, the connecting rod 46 slides downward, and the sliding of the buffer sleeve 44 synchronously drives the driven sleeve 45, and the buffer hydraulic cylinder 48 decelerates the output rod 47, so that the arch rib 1 is slowly pressed down to protect the arch rib 1, and at the same time, the first pressure plate 49 contacts and presses to open the oil inlet electromagnetic switch 491; The bottom surface of the placement mold 442 is provided with a limit plate 8, and the clamping and fixing assembly 5 is fixed at both ends of the limit plate 8. The top surface of the box body 41 is provided with a rubber pad 81 corresponding to the limit plate 8. The clamping and fixing assembly 5 is arranged on both sides of the placement mold 442. The clamping and fixing assembly 5 includes a fixed plate 51 and a group of clamping hydraulic cylinders 52 arranged on one side of the fixed plate 51 close to the arch rib 1. The fixed plate 51 is provided with an oil pipe 6 connected to the clamping hydraulic cylinder 52. The oil pipe 6 is provided with an electromagnetic valve 61 which is pressed and opened by the oil inlet electromagnetic switch 491. A group of clamping hydraulic cylinders 52 output A pressing plate 53 is provided at the outlet end, and a group of telescopic rods 54 are provided on the side of the pressing plate 53 close to the arch rib 1. The telescopic rods 54 include a cylinder and a rod sliding in the cylinder. A plate 55 abutting against the web 103 is provided at the end of the telescopic rod 54 away from the pressing plate 53, and a pressure relief spring 56 is provided on the outer sleeve of the telescopic rod 54. After the arch rib 1 is placed, the oil inlet electromagnetic switch 491 presses the opened electromagnetic valve 61, and the clamping hydraulic cylinder 52 drives the pressing plate 53 to move, so that the two plates 55 abut against the two sides of the web 103 synchronously, so that the arch rib 1 remains vertically placed. A sliding rod 57 that passes through the pressing plate 53 is fixedly provided on the side of the push plate 55 close to the pressure plate 53, and an oil-closing electromagnetic switch 58 is provided on the side of the pressure plate 53 away from the push plate 55. The sliding rod 57 is provided with a second pressure plate 59 that presses and abuts against the oil-closing electromagnetic switch 58 when the push plate 55 is not in contact with the arch rib 1, and the oil-closing electromagnetic switch 58 is in a closed state when pressed; as the pressure plate 53 moves, the push plate 55 abuts against the arch rib 1, the pressure relief spring 56 is compressed, and the sliding rod 57 slides to drive the second pressure plate 59 to release the oil-closing electromagnetic switch 58, and the oil-closing electromagnetic switch 58 is turned on. The solenoid valve 61 is released and closed by the oil-closing electromagnetic switch 58 in the open state, and the solenoid valve 61 is controlled to be closed, and the oil supply is stopped, so as to keep the clamping hydraulic cylinder 52 stably clamping the arch rib 1 and keep it vertical.

[0031] The implementation principle of the embodiment of the present application is: When actually installing the arch rib 1, several sections of the required number of arch ribs 1 are pre-processed in the factory, and transported to the construction site after passing the inspection. The arch rib 1 is hoisted to the predetermined position by a crane for alignment measurement. After the measurement is correct, the lifting point is loosened, and the fixing mechanism 3 on the bracket 2 adjusts the position of the arch rib 1 and then welds it on site. The BIM model is used to simulate and analyze the stiffness of the bracket 2, the basic support and the stability of the bracket 2 during the erection of the arch rib 1. After the arch rib 1 of each section is installed, the construction of the next section can be carried out only after the monitoring work is completed and the results are confirmed to be correct. The linear shape of the arch rib 1 is measured regularly, and the linear shape diagram of the arch rib 1 is drawn and compared with the designed linear shape of the arch rib 1 to guide the on-site adjustment.

[0032] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for installing an arch rib of a high-speed railway tied arch bridge, comprising an arch rib (1), characterized in that: The cross section of the arch rib (1) is dumbbell-shaped, comprising an upper chord tube (101), a lower chord tube (102), and a web (103) disposed between the upper chord tube (101) and the lower chord tube (102) and welded to connect the upper chord tube (101) and the lower chord tube (102); the arch rib (1) is processed in a factory, and all the arch ribs (1) are transported to a construction site, a bracket (2) is arranged on the cast bridge deck, a mounting platform (21) is disposed on the top surface of the bracket (2), and a fixing mechanism (3) is disposed on the top surface of the mounting platform (21), and the arch rib (1) is hoisted to a predetermined position by a crane for alignment measurement, and the hoisting point is released after the measurement is correct, and the fixing mechanism (3) is used to adjust the position of the arch rib (1) and then perform on-site welding.

2. The method for installing the arch rib of a high-speed railway tied arch bridge according to claim 1, characterized in that: The upper chord tube (101), the lower chord tube (102) and the web (103) are made of steel plates that are derusted and rolled into single-section tubes in a factory, and longitudinal circumferential seam welding is performed by submerged arc automatic welding.

3. The method for installing the arch rib of a high-speed railway tied arch bridge according to claim 2, characterized in that: The web (103) is precisely cut according to the corrected catenary curve using a CNC cutting machine, and the butt groove is prefabricated. The web is assembled in sections and units in a flat surface in a factory, and automated welding is used.

4. The method for installing the arch rib of a high-speed railway tied arch bridge according to claim 1, characterized in that: After the arch rib (1) is welded for 24 hours, an appearance inspection is first performed to check the actual size of the weld, the presence of pores, undercuts, slag inclusions, cracks, weld bumps, burn-throughs, and unfused and unfilled grooves on the surface. Then, based on the appearance inspection, internal quality inspections such as 100% ultrasonic flaw detection and 10% X-ray flaw detection are performed according to design requirements. After passing the inspection, anti-corrosion spraying is performed.

5. The method for installing the arch rib of a high-speed railway tied arch bridge according to claim 1, characterized in that: The fixing mechanism (3) comprises a buffer placement component (4) and a clamping and fixing component (5), wherein the buffer placement component (4) comprises a box body (41) with a built-in cavity, a fixing column (42) is arranged at the center position of the inner bottom surface of the box body (41) along the up-down direction, a guide column (43) is arranged transversely on the fixing column (42), two buffer sleeves (44) are slidably arranged on both sides of the fixing column (42) and two driven sleeves (45) are slidably arranged on both sides of the guide column (43), a transmission rod (441) for transmitting motion is arranged between adjacent buffer sleeves (44) and driven sleeves (45), and two ends of the transmission rod (441) are rotatably connected to the buffer sleeve (44) and the driven sleeve (45) respectively; An output rod (47) slidably connected to the guide column (43) is arranged at one end of the driven sleeve (45) away from the fixed column (42); buffer hydraulic cylinders (48) are arranged on the inner walls on both sides of the box body (41) corresponding to the output rod (47); the output rod (47) is slidably connected to the buffer hydraulic cylinder (48); a first pressure plate (49) is arranged in an annular shape at one end of the output rod (47) away from the buffer hydraulic cylinder (48); an oil inlet electromagnetic switch (491) which can be pressed against by the first pressure plate (49) and opened is arranged at one end of the buffer hydraulic cylinder (48) facing the first pressure plate (49); A placement mold (442) adapted to the arch rib (1) is arranged above the box body (41), and a connecting rod (46) penetrating the box body (41) and fixedly connected to the top of the buffer sleeve (44) at a higher horizontal position is arranged on the bottom surface of the placement mold (442); The clamping and fixing assembly (5) is arranged on both sides of the placing mold (442), and the clamping and fixing assembly (5) comprises a fixing plate (51) and a group of clamping hydraulic cylinders (52) arranged on a side of the fixing plate (51) close to the arch rib (1), a group of the clamping hydraulic cylinders (52) are commonly provided with a pressure plate (53) at the output end, a group of telescopic rods (54) are provided on a side of the pressure plate (53) close to the arch rib (1), abutment plates (55) abutting against the web (103) are provided at the ends of the telescopic rods (54) away from the pressure plate (53), and a pressure relief spring (56) is provided on the outer sleeve of the telescopic rods (54); A sliding rod (57) penetrating the pressing plate (53) is fixedly provided on one side of the abutment plate (55) close to the pressing plate (53); an oil-closing electromagnetic switch (58) is provided on one side of the pressing plate (53) away from the abutment plate (55); the sliding rod (57) is provided with a second pressure plate (59) for pressing against the oil-closing electromagnetic switch (58) when the abutment plate (55) is not in contact with the arch rib (1); the oil-closing electromagnetic switch (58) is in a closed state when pressed; The fixed plate (51) is provided with an oil pipe (6) connected to the clamping hydraulic cylinder (52), and the oil pipe (6) is provided with an electromagnetic valve (61) which is pressed open by an oil inlet electromagnetic switch (491). When the electromagnetic valve (61) is in an open state, the electromagnetic valve (61) is closed by releasing the oil closing electromagnetic switch (58).

6. The method for installing the arch rib of a high-speed railway tied arch bridge according to claim 5, characterized in that: A cavity is provided in the connecting rod (46), and a buffer spring (7) is provided in the cavity, with two ends respectively fixedly connected to the top surface of the fixing column (42) and the connecting rod (46).

7. The method for installing the arch rib of a high-speed railway tied arch bridge according to claim 5, characterized in that: A limit plate (8) is provided on the bottom surface of the placement mold (442), the clamping and fixing assembly (5) is fixed at both ends of the limit plate (8), and a rubber pad (81) is provided on the top surface of the box body (41) corresponding to the limit plate (8).

8. The method for installing the arch rib of a high-speed railway tied arch bridge according to claim 1, characterized in that: After the arch rib (1) of each section is installed, the construction of the next section can be carried out only after the monitoring work is completed and the results are confirmed to be correct. The linear shape of the arch rib (1) is measured regularly, and a linear shape diagram of the arch rib (1) is drawn and compared with the designed linear shape of the arch rib (1) to guide on-site adjustments.

9. The method for installing the arch rib of a high-speed railway tied arch bridge according to claim 1, characterized in that: The BIM model is used to simulate and analyze the rigidity of the support (2), the foundation support and the stability of the support (2) during the erection of the arch rib (1), thereby ensuring the safety of the construction of the support (2).

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