Hoisting process for longitudinal and transverse beams of concrete-filled steel tube arch bridge

Abstract

The invention relates to the technical field of arch bridge construction, and discloses a hoisting process for longitudinal and transverse beams of a concrete-filled steel tube arch bridge, which comprises the following steps: preparing before construction: preparing related equipment and materials such as a gantry crane, a main cable, a compound splicing jig frame, the longitudinal and transverse beams, a cable bent tower, a sports car and a movable pulley block required by hoisting; wherein the three gantry cranes are arranged at intervals in the horizontal direction and are respectively a first gantry crane, a second gantry crane and a third gantry crane; carrying out moulding bed lofting and mounting; performing segment division and compound splicing on the longitudinal and transverse beams; a gantry crane is used for carrying out tire unloading and moving storage on the sections; the segments are lifted to the arch penetrating position for the first time; the sections are put down in an arch penetrating mode; and the segment is hoisted for the second time and longitudinally moved to the installation position. Longitudinal and transverse beam grid hoisting units are reasonably divided, and a mode of combining hoisting of main transverse beams with longitudinal beams and independent hoisting of secondary transverse beams is adopted, so that the hoisting times of steel longitudinal and transverse beams and the number of overhead joints between steel beams are reduced, the construction progress is accelerated, and the welding quality of steel beam joints is improved.

Description

Technical Field

[0001] The invention relates to the technical field of arch bridge construction, and in particular to a hoisting process for longitudinal and transverse beams of a steel tube concrete arch bridge. Background Art

[0002] Steel tube concrete arch bridges are favored by designers and builders in highway construction or replacement solutions for old bridge reconstruction because of their light weight, high strength, strong anti-deformation ability, and high coordination and integration of their structural appearance with the surrounding environment. In particular, mid-span steel tube concrete arch bridges are increasingly favored in the design and construction of mountain canyon bridges because of their good stress performance and spanning capacity, and can be applied to various complex terrains.

[0003] However, in some special areas, the reassembly site is not convenient for construction, and the risk of transporting large items is high. How to quickly and efficiently complete the lifting of longitudinal and transverse beams has become a key and difficult point in project construction. The conventional method is to adopt single lifting or assemble the primary and secondary beams into segment lifting. Single lifting means lifting one main beam at a time. After all the main beams are installed, the longitudinal beams and secondary beams are installed. Although this method reduces the lifting weight and reduces the space requirements when the beams pass through the arch, the number of liftings increases, which is not conducive to the control of the construction period, and all steel beam joint bolting and welding projects are completed in the air, which increases the construction risk and quality risks. If the primary and secondary beams are assembled into segments for lifting, a wider site is required as the reassembly site to ensure the continuity of the longitudinal and transverse beam segments. Obviously, the steel structure reassembly site does not meet the requirements. At the same time, the lifting of the main and secondary beams into segments has high requirements on the space dimensions between the wind braces of the arch ring. Only when there is enough spare distance between the wind braces can the segments be smoothly lowered from above the arch ring to below the arch ring. Otherwise, the lifting and arch-penetrating process will pose a serious safety threat to the arch ring. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to disclose a hoisting process for the longitudinal and transverse beams of a steel tube concrete arch bridge, so as to improve the relevant technical problems mentioned in the above technical background, effectively improve construction efficiency and safety, improve welding efficiency and reliability, etc.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A process for hoisting longitudinal and transverse beams of a steel tube concrete arch bridge comprises the following steps:

[0007] S1. Carry out preparations before construction, and prepare the gantry crane, main cable, composite frame, longitudinal and transverse beams, cable tower, sports car, movable pulley block and other related equipment and materials required for hoisting; among them, three gantry cranes are arranged horizontally at intervals, namely the first gantry crane, the second gantry crane and the third gantry crane;

[0008] S2, laying out and installing the tire frame;

[0009] S3, segmenting and reassembling the longitudinal and transverse beams (3) based on the segmentation optimization algorithm and intelligent welding technology;

[0010] S4. Use the gantry crane to move the segments down to the tires for storage;

[0011] S5, lifting the segment to the arch position for the first time;

[0012] S6, lower the segment through the arch;

[0013] S7. Lift the segment for the second time and move it longitudinally to the installation position.

[0014] In one solution of the present invention: S3, segmenting and reassembling the longitudinal and transverse beams (3) based on the segmentation optimization algorithm and the intelligent welding technology, including:

[0015] The segment division optimization problem is modeled as a combinatorial optimization problem. The goal is to divide all the segments to be divided into several combinations so that the segments in each combination can be welded efficiently and with high quality while reducing the number of aerial joints.

[0016] Collect attribute data of all segments to be divided, including size, weight, shape, and material;

[0017] Define an objective function to evaluate the quality of different segmentation schemes; the objective function is:

[0018]

[0019] Among them, K is the number of combinations divided for the total number of segments N, J i is the number of joints in the ith combination, D i is the welding difficulty score of the ith combination, E i is the processing efficiency score of the i-th combination; α, β, and γ are weight coefficients, which are used to balance the importance of the number of aerial joints, welding difficulty, and processing efficiency respectively;

[0020] Set constraints to ensure that the segment combination meets actual production requirements, including:

[0021] (1) Size restriction: For each combination i, its total size S i Should satisfy S i ≤S max , where S max It is the maximum processing capacity of the processing equipment;

[0022] (2) Weight limit: For each combination i, its total size W i Should satisfy W i ≤W max, where W max It is the maximum weight that is easy to carry and weld;

[0023] (3) Material matching: Let M j is the material of segment j. For each combination i, the materials of all segments in it should be the same or compatible, that is, j2∈i, compatible

[0024] Genetic algorithm is used to solve the problem and the optimal segment division scheme is obtained;

[0025] The intelligent welding robot determines the welding sequence and path planning according to the optimal segment division scheme, and welds each segment in turn.

[0026] In one embodiment of the present invention, the method of using a genetic algorithm to solve the problem and obtain an optimal segment division scheme includes:

[0027] Use binary or real number coding to represent the segment partitioning scheme, where each segment is represented by an integer and the partitioning scheme is an integer array, where the same integer in the array represents the same combination;

[0028] Randomly generate a set of initial segment division schemes as the initial population;

[0029] The objective function F is used as the fitness function to evaluate the quality of each individual. The tournament selection method is adopted to select excellent individuals for reproduction according to the fitness and the two-point crossover method is used to generate new individuals. The individuals are randomly mutated. The initial scheme is iteratively optimized. After multiple iterations, the segment division scheme that meets the constraints and has the optimal objective function value is output.

[0030] In one embodiment of the present invention, the intelligent welding robot determines the welding sequence and path planning according to the optimal segment division scheme, and welds each segment in turn, including:

[0031] Convert the optimal segment division scheme into a format that can be recognized by the intelligent welding robot; transmit the converted data to the control system of the intelligent welding robot;

[0032] The intelligent welding robot automatically adjusts the welding gun posture and welding parameters including current, voltage, and speed based on the received data; and welds each segment in turn according to the welding sequence and path planning determined by the segment division scheme.

[0033] In one embodiment of the present invention, the process in step S4 includes:

[0034] The first gantry crane and the second gantry crane are synchronously moved forward to the extreme position of the second gantry crane, and the lowered segments are temporarily stored;

[0035] The first gantry crane moves out of the lifting segment range, the second gantry crane moves to the rear end of the lifting segment, the third gantry crane in the lifting area moves to the front end of the lifting segment, and the segment is lifted by the second and third gantry cranes together;

[0036] Move the second gantry crane and the third gantry crane forward to the forward limit position of the second gantry crane;

[0037] Two gantry cranes lift the segment and move it horizontally to one side, and lower the segment for temporary storage. At this time, the front end of the segment is in the lifting area, and the rear end is under the tower;

[0038] Move the two sets of cable saddles horizontally to the inside of the cable tower.

[0039] In one embodiment of the present invention, the process of step S5 includes:

[0040] The second gantry crane moves out of the lifting section range, and the third gantry crane moves back to the position of the second gantry crane;

[0041] The front end of the lifting segment is lifted by the upstream or downstream cable crane;

[0042] After the third gantry crane and the single cable crane lift the segment, the third gantry crane crane is used to move horizontally to adjust the segment to a 45° angle.

[0043] The third gantry crane and the single-set cable crane crane move forward synchronously until the rear end of the segment is completely in the lifting area and is temporarily stored during the lowering stage;

[0044] The third gantry crane moves backward and out of the lifting section range;

[0045] Another set of cables hoisted the rear end of the segment;

[0046] Two sets of cables lift the segment at the same time, and after adjusting the segment to a state perpendicular to the route, it is sent to the arch position.

[0047] In one embodiment of the present invention, the process of step S6 includes:

[0048] After the segment is transported to the designated arch-through position by two sets of cable cranes, the segment is adjusted to a slightly 45° angle by using two sets of cable cranes to move in opposite directions one after the other.

[0049] The lowered segment passes through the arch ring;

[0050] After the segment passes through the arch ring, two sets of cables are used to adjust it to a posture perpendicular to the route and lower it to a temporary storage platform in front of the arch foot.

[0051] In one solution of the present invention, during the arch penetration process, the spatial relationship between the vertical dislocation of the first and second wind supports can be utilized to achieve smooth arch penetration by moving the overhead crane back and forth.

[0052] In one embodiment of the present invention, the process of step S7 includes:

[0053] Move two sets of cable saddles horizontally to the outside of the cable tower;

[0054] Install slings at both ends of the segment to lengthen the segment.

[0055] Use two sets of cables to lift the segments from the outside of the arch ring through the slings, and move them longitudinally to the designated position for installation.

[0056] In one solution of the present invention: in step S3, during reassembly, a permanent connection is made at the joint position between the longitudinal beam and the main cross beam, and a temporary connection correction is made at the joint position between the longitudinal beam and the secondary cross beam using rivets.

[0057] In summary, the present invention discloses a hoisting process for the longitudinal and transverse beams of a steel tube concrete arch bridge. By reasonably dividing the longitudinal and transverse beam grid hoisting units, while ensuring that the hoisting weight meets the requirements and the deformation of the steel beam can be effectively controlled, a method combining the hoisting of the main crossbeam with the longitudinal beam and the separate hoisting of the secondary crossbeam is adopted, thereby reducing the number of hoisting times of the steel longitudinal and transverse beams, transforming high-altitude operations into ground operations, speeding up the construction progress, reducing the number of aerial joint bolting and welding projects, reducing safety risks and quality hazards in the construction process, and improving construction safety. Through intelligent welding technology and segment division optimization algorithm, welding efficiency and reliability are improved, while the segment division scheme is optimized, reducing material waste and processing costs. The present invention is suitable for construction in special terrain conditions where the capacity of the complex site is relatively small. Through the cooperation of the gantry crane and the cable crane, continuous operation in a small space is achieved, avoiding damage to the environment caused by large-scale excavation.

[0058] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0060] Figure 1 It is a schematic flow chart of the process for hoisting the longitudinal and transverse beams of a steel tube concrete arch bridge of the present invention;

[0061] Figure 2 It is a schematic diagram of the states of the first gantry crane and the second gantry crane conveying segments during construction of the present invention;

[0062] Figure 3It is a schematic diagram of the state in which the first gantry crane moves backward and the second gantry crane and the third gantry crane are respectively located at two ends of the segment during construction of the present invention;

[0063] Figure 4 It is a schematic diagram of the state of the second gantry crane and the third gantry crane conveying segments during the construction of the present invention;

[0064] Figure 5 It is a schematic diagram of the state of the third gantry crane and the single set of cable crane conveying segments during construction of the present invention;

[0065] Figure 6 It is a schematic diagram of the state of two groups of cable-suspended conveying segments during construction of the present invention;

[0066] Figure 7 It is a schematic diagram of the state of the segment passing through the arch during the construction of the present invention;

[0067] Figure 8 It is a schematic diagram of the state in which the segments are longitudinally moved to the installation position during construction of the present invention.

[0068] In the figure: 1. Main cable; 2. Composite tyre frame; 3. Longitudinal and transverse beams; 4. Cable tower; 5. Sports car; 6. First gantry crane; 7. Second gantry crane; 8. Third gantry crane. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0071] See also Figure 1-Figure 8 The present invention is a hoisting process for longitudinal and transverse beams of steel tube concrete arch bridges, which is suitable for the hoisting construction of steel longitudinal and transverse beams 3 when it is impossible to build a steel structure reassembly site under the bridge or it is difficult to build a reassembly site, and the bridge head can be used as a reassembly site. It specifically includes the following steps:

[0072] First, execute step S1 to carry out preparations before construction, and prepare the gantry crane, main cable 1, composite tire frame 2, longitudinal and transverse beams 3, cable tower 4, sports car 5, movable pulley block and other related equipment and materials required for lifting; among them, three gantry cranes are arranged at intervals in the horizontal direction, namely the first gantry crane 6, the second gantry crane 7 and the third gantry crane 8.

[0073] Next, execute step S2 to lay out and install the tire frame.

[0074] Then, step S3 is executed to divide and reassemble the longitudinal and transverse beams 3 into sections.

[0075] It should be noted that the three lifting units of the longitudinal and transverse beams are reasonably divided. On the premise of ensuring that the lifting weight meets the requirements and the deformation of the steel beams can be effectively controlled, the main beam with the longitudinal beam is lifted in combination with the secondary beam alone. The lifting times of the steel longitudinal and transverse beams 3 and the number of aerial joints between the steel beams are reduced, and the high-altitude operation is transformed into ground operation, which reduces the construction safety risk, speeds up the construction progress, and improves the welding quality of the steel beam joints. Based on the principle of minimizing the number of aerial bolting and welding between the main beam, the secondary beam and the longitudinal beam, and considering the passability of the three segments of the longitudinal and transverse beams when passing through the arch ring "from top to bottom", the joints between the longitudinal beam and the main beam are bolted and welded firmly when reassembling at the reassembly site. At the same time, the versatility of the longitudinal and transverse beams 3 is utilized. After each segment is reassembled, the next segment can be reassembled without adjusting the tire frame, so as to achieve continuous reassembly.

[0076] In the fields of welding, steel structure manufacturing, etc., the segment division has an important impact on the subsequent processing, assembly and welding quality. Preferably, in the present invention, the longitudinal and transverse beams 3 are segmented and reassembled based on the segment division optimization algorithm and intelligent welding technology. By optimizing the segment division, the optimal segment combination is automatically divided according to the structural characteristics and hoisting requirements of the longitudinal and transverse beams, the number of aerial joints is reduced, and the production efficiency and welding quality are improved; and in the reassembly process, an intelligent welding robot is used to accurately control the welding position and quality through machine vision technology, thereby improving welding efficiency and reliability.

[0077] Step S3, segmenting and reassembling the longitudinal and transverse beams 3 based on the segmentation optimization algorithm and intelligent welding technology, specifically includes:

[0078] S31: Problem Modeling

[0079] The segment division optimization problem is modeled as a combinatorial optimization problem. There is a set of segments to be divided, each of which has specific attributes such as size, weight, shape, etc. The goal is to divide these segments into several combinations so that the segments in each combination can be welded efficiently and with high quality while reducing the number of aerial joints.

[0080] S32: Problem Solving

[0081] Collect attribute data of all segments to be divided, including size, weight, shape, and material;

[0082] An objective function is defined to evaluate the quality of different segment division schemes; in an embodiment of the present invention, the objective function comprehensively considers the following factors: (1) Number of aerial joints: Minimize the number of aerial joints to improve welding efficiency and reliability. (2) Welding difficulty: Evaluate the welding difficulty between different segment combinations, and give priority to combinations with lower welding difficulty. (3) Processing efficiency: Consider the limitations of processing equipment and processing sequence to improve overall processing efficiency.

[0083] Specifically, the objective function is:

[0084]

[0085] Among them, K is the number of combinations divided for the total number of segments N, J i is the number of joints in the ith combination, D i is the welding difficulty score of the ith combination, E i is the processing efficiency score of the i-th combination; α, β, and γ are weight coefficients, which are used to balance the importance of the number of aerial joints, welding difficulty, and processing efficiency respectively;

[0086] Set constraints to ensure that the segment combination meets actual production requirements, including:

[0087] (1) Size restriction: For each combination i, its total size S i Should satisfy S i ≤S max , where S max It is the maximum processing capacity of the processing equipment, ensuring that the size of each segment combination should be within the processing capacity of the processing equipment.

[0088] (2) Weight limit: For each combination i, its total size W i Should satisfy W i ≤W max , where W max It is the maximum weight that is convenient for handling and welding, ensuring that the weight of each segment combination is convenient for handling and welding.

[0089] (3) Material matching: Let M j is the material of segment j. For each combination i, the materials of all segments in it should be the same or compatible, that is, j2∈i, compatible Segments of the same material should be divided into the same combination to reduce the difficulty of welding.

[0090] The genetic algorithm is used to solve the problem and obtain the optimal segment division scheme, which includes:

[0091] Use binary or real number coding to represent the segment partitioning scheme, where each segment is represented by an integer and the partitioning scheme is an integer array, where the same integer in the array represents the same combination;

[0092] Randomly generate a set of initial segment division schemes as the initial population;

[0093] The objective function F is used as the fitness function to evaluate the quality of each individual. The tournament selection method is adopted to select excellent individuals for reproduction according to the fitness and the two-point crossover method is used to generate new individuals. The individuals are randomly mutated. The initial scheme is iteratively optimized. After multiple iterations, the segment division scheme that meets the constraints and has the optimal objective function value is output.

[0094] The intelligent welding robot determines the welding sequence and path planning according to the optimal segment division scheme, and welds each segment in turn, specifically including:

[0095] Convert the optimal segment division scheme into a format that can be recognized by the intelligent welding robot; transmit the converted data to the control system of the intelligent welding robot;

[0096] The intelligent welding robot automatically adjusts the welding gun posture and welding parameters including current, voltage, speed, etc. according to the received data; and welds each segment in turn according to the welding sequence and path planning determined by the segment division plan.

[0097] This embodiment improves welding efficiency and reliability through the above-mentioned intelligent welding technology and segment division optimization algorithm, while optimizing the segment division scheme and reducing material waste and processing costs.

[0098] Furthermore, the beam grid hoisting section adopts the method of hoisting the main beam with the longitudinal beam + hoisting the secondary beam separately, mainly considering the characteristics of the main beam with large cross section, many ribs and high rigidity to ensure that the deformation of the main beam during the hoisting process meets the requirements. When the beam grid is reassembled, the joint position of the longitudinal beam and the main beam needs to be permanently connected, and the joint of the longitudinal beam and the secondary beam is only temporarily connected and corrected by nails.

[0099] Because the span of the gantry crane in the reassembly yard is wider than the clear distance inside the four columns of the tower, three gantry cranes and cable cranes are required to cooperate with each other to transport the segments to the lifting area.

[0100] Next, step S4 is executed to move the segment to the next tire using the gantry crane. Specifically, the specific process of step S4 includes:

[0101] Please combine Figure 2, use two 28m wide gantry cranes in the reassembly yard to lower the tire (because the reassembly yard is not long enough, 28m wide gantry cranes are used to increase the area of ​​the reassembly yard). The first gantry crane 6 and the second gantry crane 7 are synchronously moved forward to the extreme position of the second gantry crane 7, and the segments are lowered for temporary storage.

[0102] Please combine Figure 3 The first gantry crane 6 moves out of the range of the lifting segment, the second gantry crane 7 moves to the rear end of the lifting segment, and the third gantry crane 8 in the lifting area moves to the front end of the lifting segment. The segment is lifted by the second gantry crane 7 and the third gantry crane 8 together.

[0103] Please combine Figure 4 , move the second door crane 7 and the third door crane 8 forward to the forward limit position of the second door crane 7;

[0104] Two gantry cranes lift the segment and move it horizontally to one side, and lower the segment for temporary storage. At this time, the front end of the segment is in the lifting area, and the rear end is under the tower;

[0105] Move the two sets of cable saddles horizontally to the inner side of cable tower 4.

[0106] Next, step S5 is executed to lift the segment to the arch position for the first time. Specifically, the process of step S5 includes:

[0107] Please combine Figure 5 , the second gantry crane 7 moves out of the hoisting segment range, and the third gantry crane 8 moves to the position of the second gantry crane 7;

[0108] The front end of the lifting segment is lifted by the upstream or downstream cable crane;

[0109] After the third gantry crane 8 and the single set of cable cranes lift the segment, the third gantry crane 8 is used to move the overhead crane horizontally to adjust the segment to a 45° angle.

[0110] The third gantry crane 8 moves forward synchronously with the single-group cable crane crane until the rear end of the segment is completely within the lifting area and is temporarily stored during the lowering stage.

[0111] Please combine Figure 6 , the third gantry crane 8 moves backward and out of the lifting segment range;

[0112] Another set of cables hoisted the rear end of the segment;

[0113] Two sets of cables lift the segment at the same time, and after adjusting the segment to a state perpendicular to the route, it is sent to the arch position.

[0114] Then, step S6 is executed to lower the segment through the arch. The specific process of S6 includes:

[0115] Please combine Figure 7 After the segment is transported to the designated arch position by two sets of cable cranes, the segment is adjusted to a slightly 45° angle by using two sets of cable cranes to move in opposite directions one after the other.

[0116] The lowered segment passes through the arch ring;

[0117] After the segment passes through the arch ring, two sets of cables are used to adjust it to a posture perpendicular to the route and lower it to a temporary storage platform in front of the arch foot.

[0118] It should be noted that when the segment passes through the arch, the spatial relationship between the first and second wind braces is used, and two sets of cable cranes are used to make reverse movements to adjust the segment posture. During the arch passing process, the positional relationship between the segment and the arch ring should be observed to avoid collision between the segment and the arch ring. During the arch passing process, the spatial relationship between the vertical dislocation of the first and second wind braces can be used to achieve smooth arch passing by moving the crane forward and backward.

[0119] Finally, step S7 is executed to lift the segment for the second time and move it longitudinally to the installation position. The specific process of step S7 includes:

[0120] Please combine Figure 8 , move the two sets of cable saddles horizontally to the outside of cable tower 4;

[0121] Install slings at both ends of the segment to lengthen the segment.

[0122] Use two sets of cables to lift the segments from the outside of the arch ring through the slings, and move them longitudinally to the designated position for installation.

[0123] The following points should be noted during the construction of the hoisting process of the longitudinal and transverse beams of the steel tube concrete arch bridge of the present invention:

[0124] The segment is transported to the lifting area in a posture parallel to the route direction. The segment needs to be "laid horizontally" before it can be lifted by two sets of cable cranes. However, the segment length is larger than the span of the gantry crane and cannot be "laid horizontally" by two sets of gantry cranes. The segment can only be "laid horizontally" by using one set of cable crane to lift the front end of the segment and the gantry crane to lift the rear end of the segment. The segment can then be "laid horizontally" by using the gantry crane overhead crane to move horizontally.

[0125] When hoisting the main crossbeam segment, it is necessary to ensure that the weight of the longitudinal beams on both sides is consistent, otherwise temporary counterweights are required to avoid tipping during the hoisting process or after hanging on the boom.

[0126] The hoisting process principle of the longitudinal and transverse beams of the steel tube concrete arch bridge of the present invention is as follows:

[0127] 1. In principle, the number of aerial bolting and welding between the main crossbeam, secondary crossbeam and longitudinal beam is minimized, and the passability of the longitudinal and transverse beam 3 segments when passing through the arch ring "from top to bottom" is considered. The joints between the longitudinal beam and the main crossbeam are bolted and welded firmly when reassembling at the reassembly field. At the same time, the versatility of the longitudinal and transverse beam 3 is utilized. After each reassembly of a segment is completed, the next segment can be reassembled without adjusting the tire frame, so as to achieve continuous reassembly.

[0128] 2. The lower segments are transported to the hoisting area using a gantry crane and placed at an angle of about 45°. Then the cable hoist system saddle is moved inward, and the appropriate position of the steel beam segment is selected as the lifting point. The steel beam is lifted and two sets of cable cranes are used to straighten the steel beam and transport it to the top of the first and second wind braces of the arch ring. The two sets of sports cars 5 drive in opposite directions and adjust the segment posture to meet the lowering requirements. The distance between the first and second wind braces of a mid-span steel tube arch bridge is usually relatively large (because the bridge deck passes through the arch ring from here), and they are staggered in space, so this position can be used to lower the three segments of the longitudinal and transverse beams below the arch ring.

[0129] 3. Due to the obstruction of the arch ring wind support, the 3 sections of the longitudinal and transverse beams cannot be directly transported longitudinally to the designated position. Therefore, after the 3 sections of the longitudinal and transverse beams are lowered below the arch ring, the saddle needs to be moved outward so that the hook of the sports car 5 is outside the arch ring, and the crossbeam is lengthened by the sling to make it wider than the arch ring. Finally, two sets of cables are used to lift the 3 sections of the longitudinal and transverse beams from the outside of the arch ring to the designated position for installation.

[0130] The characteristics of the hoisting process of the longitudinal and transverse beams of the steel tube concrete arch bridge of the present invention are:

[0131] By reasonably dividing the longitudinal and transverse beams into three lifting units, and ensuring that the lifting weight meets the requirements and that the deformation of the steel beams can be effectively controlled, a combination of lifting the main crossbeam with the longitudinal beam and lifting the secondary crossbeam separately is adopted to reduce the number of lifting times of the 3 steel longitudinal and transverse beams and the number of aerial joints between the steel beams, thereby transforming high-altitude operations into ground operations, reducing construction safety risks, accelerating construction progress, and improving the welding quality of steel beam joints.

[0132] By using the cooperation between gantry crane and cable crane, the steel beam reassembly, relocation, hoisting, arch insertion and positioning can be carried out in an assembly line manner. This allows continuous operations to be carried out in a small space even when the capacity of the reassembly site is small under special terrain conditions, thereby ensuring the progress of bridge construction.

[0133] The steel longitudinal and transverse beams 3 are hoisted in a "top-down" manner. When the arch seat is excavated, it is only necessary to level out a piece of land in front of the arch foot as a transfer site for the longitudinal and transverse beams 3 segments, thus avoiding excessive damage to the environment caused by large-scale excavation.

[0134] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

[0135] At the same time, in the description of the present invention, the meaning of "several" is one or more, the meaning of "more" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

Claims

1. A process for hoisting longitudinal and transverse beams of a steel tube concrete arch bridge, characterized in that: The following steps are involved: S1. Carry out preparations before construction, and prepare the gantry crane, main cable (1), composite tire frame (2), longitudinal and transverse beams (3), cable tower (4), sports car (5), movable pulley block and related equipment and materials required for hoisting; wherein, three gantry cranes are arranged at intervals in the horizontal direction, namely the first gantry crane (6), the second gantry crane (7) and the third gantry crane (8); S2, laying out and installing the tire frame; S3, segmenting and reassembling the longitudinal and transverse beams (3) based on the segmentation optimization algorithm and intelligent welding technology; S4. Use the gantry crane to move the segments down to the tires for storage; S5, lifting the segment to the arch position for the first time; S6, lower the segment through the arch; S7. Lift the segment for the second time and move it longitudinally to the installation position.

2. The hoisting process of the longitudinal and transverse beams of the steel tube concrete arch bridge according to claim 1 is characterized in that: S3, segmenting and reassembling the longitudinal and transverse beams (3) based on the segmentation optimization algorithm and intelligent welding technology, including: The segment division optimization problem is modeled as a combinatorial optimization problem. The goal is to divide all the segments to be divided into several combinations so that the segments in each combination can be welded efficiently and with high quality while reducing the number of aerial joints. Collect attribute data of all segments to be divided, including size, weight, shape, and material; Define an objective function to evaluate the quality of different segmentation schemes; the objective function is: Among them, K is the number of combinations divided for the total number of segments N, J i is the number of joints in the ith combination, D i is the welding difficulty score of the ith combination, E i is the processing efficiency score of the i-th combination; α, β, and γ are weight coefficients, which are used to balance the importance of the number of aerial joints, welding difficulty, and processing efficiency respectively; Set constraints to ensure that the segment combination meets actual production requirements, including: (1) Size restriction: For each combination i, its total size S i Should satisfy S i ≤S max , where S max It is the maximum processing capacity of the processing equipment; (2) Weight limit: For each combination i, its total size W i Should satisfy W i ≤W max , where W max It is the maximum weight that is easy to carry and weld; (3) Material matching: Let M j is the material of segment j. For each combination i, the materials of all segments in it should be the same or compatible, that is, compatible Genetic algorithm is used to solve the problem and the optimal segment division scheme is obtained; The intelligent welding robot determines the welding sequence and path planning according to the optimal segment division scheme, and welds each segment in turn.

3. The hoisting process of the longitudinal and transverse beams of the steel tube concrete arch bridge according to claim 2 is characterized in that: in, The genetic algorithm is used to solve the problem and obtain the optimal segment division scheme, which includes: Use binary or real number coding to represent the segment partitioning scheme, where each segment is represented by an integer and the partitioning scheme is an integer array, where the same integer in the array represents the same combination; Randomly generate a set of initial segment division schemes as the initial population; The objective function F is used as the fitness function to evaluate the quality of each individual. The tournament selection method is adopted to select excellent individuals for reproduction according to the fitness and the two-point crossover method is used to generate new individuals. The individuals are randomly mutated. The initial scheme is iteratively optimized. After multiple iterations, the segment division scheme that meets the constraints and has the optimal objective function value is output.

4. The process for hoisting the longitudinal and transverse beams of a steel tube concrete arch bridge according to claim 3 is characterized in that: in, The intelligent welding robot determines the welding sequence and path planning according to the optimal segment division scheme, and welds each segment in turn, including: Convert the optimal segment division scheme into a format that can be recognized by the intelligent welding robot; transmit the converted data to the control system of the intelligent welding robot; The intelligent welding robot automatically adjusts the welding gun posture and welding parameters including current, voltage, and speed based on the received data; and welds each segment in turn according to the welding sequence and path planning determined by the segment division scheme.

5. The process for hoisting the longitudinal and transverse beams of a steel tube concrete arch bridge according to claim 1 is characterized in that: The process in step S4 includes: The first door crane (6) and the second door are synchronously moved forward to the extreme position of the second door crane (7), and the lowered segments are temporarily stored; The first gantry crane (6) moves out of the range of the lifting segment, the second gantry crane (7) moves to the rear end of the lifting segment, the third gantry crane (8) in the lifting area moves to the front end of the lifting segment, and the segment is lifted by the second gantry crane (7) and the third gantry crane (8) together; The second door crane (7) and the third door crane (8) are moved forward to the forward movement limit position of the second door crane (7); Two gantry cranes lift the segment and move it horizontally to one side, and lower the segment for temporary storage. At this time, the front end of the segment is in the lifting area, and the rear end is under the tower; The two sets of cable saddles are moved horizontally to the inner side of the cable tower (4).

6. The process for hoisting the longitudinal and transverse beams of a steel tube concrete arch bridge according to claim 1 is characterized in that: The process of step S5 includes: The second gantry crane (7) is moved out of the range of the lifting segment, and the third gantry crane (8) is moved back to the position of the second gantry crane (7); The front end of the lifting segment is lifted by the upstream or downstream cable crane; After the third gantry crane (8) and the single cable crane lift the segment, the third gantry crane (8) is used to move the overhead crane horizontally to adjust the segment to a 45° angle; The third gantry crane (8) moves forward synchronously with the single-set cable crane crane until the rear end of the segment is completely within the lifting area and is temporarily stored during the lowering stage; The third gantry crane (8) moves backward and out of the range of the lifting segment; Another set of cables hoisted the rear end of the segment; Two sets of cables lift the segment at the same time, and after adjusting the segment to a state perpendicular to the route, it is sent to the arch position.

7. The process for hoisting the longitudinal and transverse beams of a steel tube concrete arch bridge according to claim 1 is characterized in that: The process of step S6 includes: After the segment is transported to the designated arch-through position by two sets of cable cranes, the segment is adjusted to a slightly 45° angle by using two sets of cable cranes to move in opposite directions one after the other. The lowered segment passes through the arch ring; After the segment passes through the arch ring, two sets of cables are used to adjust it to a posture perpendicular to the route and lower it to a temporary storage platform in front of the arch foot.

8. The process for hoisting the longitudinal and transverse beams of a steel tube concrete arch bridge according to claim 7 is characterized in that: During the arch penetration process, the spatial relationship of the vertical dislocation of the first and second wind braces can be utilized to achieve smooth arch penetration by moving the overhead crane back and forth.

9. The process for hoisting the longitudinal and transverse beams of a steel tube concrete arch bridge according to claim 1, characterized in that: The process of step S7 includes: Transversely move the two sets of cable saddles to the outside of the cable tower (4); Install slings at both ends of the segment to lengthen the segment; Use two sets of cables to lift the segments from the outside of the arch ring through the slings, and move them longitudinally to the designated position for installation.

10. The process for hoisting the longitudinal and transverse beams of a steel tube concrete arch bridge according to claim 1, characterized in that: In step S3, during the reassembly, a permanent connection is made at the joint position between the longitudinal beam and the main cross beam, and a temporary connection correction is made at the joint position between the longitudinal beam and the secondary cross beam using rivets.

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