Arch rib overall vertical lifting rigid locking device in basket type steel box arch bridge and construction method

Abstract

The invention discloses an overall vertical lifting rigid locking device for a middle arch rib of a basket type steel box arch bridge and a construction method, and belongs to the technical field of basket type steel box arch bridge construction.The device comprises a middle arch rib support, a vertical lifting system, a transverse rigid locking structure and a longitudinal rigid locking structure; according to the method, after the middle arch ribs are spliced, longitudinal, transverse and vertical three-direction rigid locking is achieved through transverse opposite-pulling ribs, transverse inner supporting rods, longitudinal opposite-pulling ribs and lifting cables, the middle arch ribs are integrally lifted at four lifting point positions through a hydraulic synchronous lifting system by means of the lifting cables, and the stability of the middle arch ribs in the overall lifting process is ensured; the three-direction cable force is gradually loaded in a graded mode, and it is guaranteed that the linear posture, stress detection and the camber of the middle arch rib all meet the requirements; and after closure, middle arch rib assembly constraint is relieved, releasing is conducted according to the reverse process, and after construction, a support and a base are dismantled to guarantee the integrity of the middle arch rib. The design structure is reasonable, the construction efficiency is improved, and the construction cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of the construction of basket - type steel box arch bridges, and more specifically relates to a rigid locking device and construction method for the integral vertical lifting of the arch rib in a basket - type steel box arch bridge. Background Technique

[0002] Span basket - type steel box arch bridges usually span deep valleys, rivers, important urban areas or adjacent existing lines. Their construction process is not only related to the quality and safety of the bridge itself, but may also have a significant impact on the surrounding environment. For large - span basket - type steel box arch bridges with the construction sequence of beam first and then arch, traditional construction methods such as the support method, the jacking method and the rotation method have many deficiencies in terms of construction efficiency, economy and environmental impact. The construction technology of first assembling the middle arch rib at a low position and then integrally lifting it vertically is a new construction method, which has the advantages of fast construction speed, small environmental impact, high construction accuracy and safety and reliability. Among its key technologies, the rigid locking of the middle arch rib before the overall lifting after the low - position assembly and the design and construction of the lifting structure are technical problems that need to be solved urgently. Summary of the Invention

[0003] In view of this, the invention provides a rigid locking device and construction method for the integral vertical lifting of the arch rib in a basket - type steel box arch bridge, aiming to solve the problem of how to ensure that during the overall lifting process of the middle arch rib of a large - span basket - type steel box arch bridge under the conditions of its own weight and wind load, etc., the strength, stiffness and stability of the overall middle arch rib meet the specification requirements, and achieve a complete, stable and continuous lifting.

[0004] To achieve the above - mentioned purpose, the invention adopts the following technical scheme:

[0005] A rigid locking construction method for the integral vertical lifting of the arch rib in a basket - type steel box arch bridge, comprising the following steps:

[0006] S1: Installation of one - side lifting support: After one - side side arch rib is installed, install one - side lifting support and the hydraulic synchronous lifting system;

[0007] S2: Installation of the middle arch rib: Set up a middle arch rib support on the concrete beam surface for successively installing each segment of the middle arch rib; Release the rigid constraint of the middle arch rib before vertical lifting;

[0008] S3: Installation of the other - side lifting support: After the middle arch rib is installed, use a crane to install the other - side lifting support and the hydraulic synchronous lifting system;

[0009] S4: Transverse rigid locking of the middle arch rib: After the middle arch rib is installed, transversely and temporarily rigidly lock the two ends; Set up transverse tie bars and transverse internal struts on the middle arch rib, and set a certain transverse tie - bar cable force;

[0010] S5: Longitudinal Rigid Locking of the Middle Arch Rib: After the installation of the middle arch rib is completed, temporarily lock the middle arch rib longitudinally; install longitudinal tension tie bars on the middle arch rib; and alternately apply cable forces to the longitudinal tension tie bars step by step with the lifting cables until the alignment, stress, and cable force of the middle arch rib meet the specification requirements.

[0011] S6: Vertical Rigid Locking of the Middle Arch Rib: Temporarily lock the middle arch rib vertically; install a vertical lifting system and apply vertical cable forces to the lifting cables step by step until the alignment, stress, and cable force of the middle arch rib meet the specification requirements.

[0012] S7: Gradual Loading of the Middle Arch Rib: When the stiffness is locked, first pre-tighten the lifting cables and complete the transverse tensioning. Then, load in stages by applying vertical lifting cable forces first and then longitudinal cable forces. Each time, load in four steps at 25% of the designed cable force, and synchronously release the constraints of the assembly brackets from both ends to the mid-span.

[0013] S8: Trial Lifting of the Middle Arch Rib: Lift the middle arch rib to a certain height and collect data in real time.

[0014] S9: Formal Lifting of the Middle Arch Rib: Lift the middle arch rib as a whole, cycle and lift at a step distance of 300 mm. After each completion of 6-step cycles, monitor and measure the attitude of the steel arch rib.

[0015] S10: Closure of the Middle Arch Rib and the Side Arch Ribs: The closure section construction adopts a dynamic adaptation process. A closure section perpendicular to the arch axis is set between the overall vertical lifting section of the middle arch rib and the in-situ assembly section of the side arch ribs. There are four such closure sections in the whole bridge.

[0016] S11: Relaxation of the Longitudinal, Transverse, and Vertical Cables of the Middle Arch Rib: After the installation, welding, and non-destructive testing of the closure section are completed and qualified, the system transformation is completed. First, release the constraints of the assembly section of the middle arch rib, and then relax the middle arch rib in the reverse process.

[0017] S12: Removal of Auxiliary Facilities: After the system transformation of the arch rib is completed, remove the middle arch rib support, the bases of the transverse internal braces, the bases of the longitudinal tension tie bars, and the bases of the vertical lifting. After grinding and spraying anti-rust paint on the welds, complete the painting consistent with the arch rib.

[0018] Further, in S2, the column feet of the middle arch rib support are fixed to the concrete beam body through embedded steel plates.

[0019] Further, in S4, the transverse tension tie bars and the bases of the transverse internal braces used to connect the transverse internal braces are fabricated simultaneously with the middle arch rib; the steel material of the bases of the transverse internal braces is the same as that of the middle arch rib, and they are fully penetrated and welded with the middle arch rib and subjected to weld flaw detection.

[0020] Further, there are two groups of the transverse tension tie bars and the transverse internal braces, which are respectively fixedly connected to the upper and lower sides of the middle arch rib. There are two in each group, and they are symmetrically arranged with respect to the central axis of the arch bridge.

[0021] Further, in S5, the longitudinal tie bar base for connecting the longitudinal tie bars is fabricated simultaneously with the middle arch rib, and is fully penetrated and welded to the middle arch rib, and weld flaw detection is performed on the weld seam.

[0022] Further, there are two groups of the longitudinal tie bars, which are respectively arranged on both sides of the middle arch rib; each group has two bars, which are respectively arranged at the upper and lower parts on the side of the middle arch rib.

[0023] Further, there are four groups of the lifting cables symmetrically arranged along the center of the middle arch rib, connecting the hydraulic synchronous lifting system and the middle arch rib; a total of 4 lifting points are arranged on the middle arch rib, and the hydraulic synchronous lifting system uses the lifting cables to integrally lift the middle arch rib.

[0024] Further, in S11, the releasing sequence of the middle arch rib: the horizontal cable force and the lifting cable force are released step by step synchronously at 25%, and the horizontal stay cables are released in an orderly, symmetric and uniform manner strictly following the releasing sequence of the upper inner side → the upper outer side → the lower inner side → the lower outer side.

[0025] An overall vertical lifting and rigid locking device for the middle arch rib of a basket - type steel box arch bridge, comprising a middle arch rib support, a vertical lifting system, a transverse rigid locking structure and a longitudinal rigid locking structure;

[0026] The middle arch rib support is arranged on the completed concrete bridge deck for pre - assembling each segment of the middle arch rib;

[0027] The vertical lifting system includes two groups of lifting supports, a hydraulic synchronous lifting system, lifting cables and vertical lifting bases; the two groups of lifting supports are respectively erected on both sides of the middle arch rib, and are fixedly connected by a lifting top plate between the two groups of lifting supports, and the hydraulic synchronous lifting system is fixed on the lifting top plate; the vertical lifting bases and the lifting cables are symmetrically arranged in four groups along the center of the middle arch rib; the vertical lifting bases are welded to the middle arch rib; one end of the lifting cable is connected to the hydraulic synchronous lifting system, and the other end is connected to the vertical lifting base;

[0028] The transverse rigid locking structure includes transverse tie bars, transverse internal braces and transverse internal brace bases; both sides of the transverse internal braces are connected to the inner side of the middle arch rib through the transverse internal brace bases; both ends of the transverse tie bars are respectively fixedly connected to both ends of the middle arch rib;

[0029] The longitudinal rigid locking structure includes longitudinal tie bars and longitudinal tie bar bases; the longitudinal tie bar bases are welded to both sides of the middle arch rib for connecting the longitudinal tie bars and the middle arch rib.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. Reduction of the operating line grade in the vicinity: The under-construction line is parallel to the existing operating line. If the traditional in-situ support method is adopted, the support height is high. In case of overturning, it will enter the railway operation limit, and the construction grade is high. After adopting the current technology, the support height is reduced, the operating line grade in the vicinity is reduced, and the safety is also greatly improved.

[0032] 2. Improvement of construction efficiency: During the construction process, the interference of construction near the operating line is reduced, the construction period is shortened, and the construction efficiency is improved.

[0033] 3. Cost reduction: The height of the middle arch rib assembly support is reduced by 20 meters, the engineering quantity of the assembly support is reduced, the hoisting height of the middle arch rib is reduced, the corresponding hoisting equipment model of the arch rib segment is reduced, and the temporary facility cost and machinery cost are both reduced accordingly.

[0034] 4. Reasonable structural design: The three-way cable structure in the vertical, horizontal and longitudinal directions is reasonably designed. To ensure the strength of the arch rib during the lifting process, partitions and temporary bases are added inside and outside the middle arch rib during the manufacturing in the middle arch rib factory, ensuring the safety of the arch rib structure and the lifting safety during rigid locking. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0036] Figure 1 It is a structural schematic diagram during the construction of the present invention.

[0037] Figure 2 It is a structural schematic diagram of the middle arch rib of the present invention.

[0038] Among them, in the figure:

[0039] 1 - Lifting support; 2 - Hydraulic synchronous lifting system; 3 - Vertical lifting base; 4 - Longitudinal tie bar; 5 - Longitudinal tie bar base; 6 - Transverse internal strut; 7 - Transverse internal strut base; 8 - Transverse tie bar; 9 - Middle arch rib. Detailed Embodiments

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to the attachedFigure 1-2 In view of the construction of long - span basket - type steel box arches with the sequence of "beam first and arch later", the present invention provides a rigid locking device for the integral vertical lifting of the arch rib in a basket - type steel box arch bridge, which includes a middle arch rib support, a vertical lifting system, a transverse rigid locking structure, and a longitudinal rigid locking structure.

[0042] The middle arch rib support is arranged on the completed concrete bridge deck and is used for pre - assembling each section of the middle arch rib 9 to form a predetermined linear attitude and camber. The column feet of the middle arch rib support are fixedly connected to the concrete bridge deck through embedded steel plates.

[0043] The vertical lifting system is used for the integral vertical lifting of the middle arch rib 9.

[0044] The vertical lifting system includes two groups of lifting brackets 1, a hydraulic synchronous lifting system 2, lifting cables, and vertical lifting bases 3; the two groups of lifting brackets 1 are respectively erected on both sides of the middle arch rib 9, and the two groups of lifting brackets 1 are fixedly connected by a lifting top plate, and the hydraulic synchronous lifting system 2 is fixed on the lifting top plate; four groups of the vertical lifting bases 3 and the lifting cables are symmetrically arranged along the center of the middle arch rib 9; the vertical lifting bases 3 are welded to the middle arch rib 9; one end of the lifting cable is connected to the hydraulic synchronous lifting system 2, and the other end is connected to the vertical lifting base 3. A total of 4 lifting points are arranged on the middle arch rib 9, and the hydraulic synchronous lifting system uses the lifting cables to integrally lift the middle arch rib 9.

[0045] The transverse rigid locking structure includes transverse tie - rods 8, transverse internal braces 6, and transverse internal brace bases 7; there are two groups of both the transverse tie - rods 8 and the transverse internal braces 6, which are respectively fixedly connected to the upper and lower sides of the middle arch rib 9, with two in each group, symmetrically arranged with respect to the central axis of the arch bridge, for a total of eight connection points; both ends of the transverse tie - rods 8 are respectively fixedly connected to the two ends of the middle arch rib 9; both sides of the transverse internal braces 6 are connected to the inner side of the middle arch rib 9 through the transverse internal brace bases 7 for supporting the middle arch rib 9; there are eight transverse internal brace bases 7, all of which are welded to the middle arch rib 9; the steel material of the transverse internal brace bases is the same as that of the middle arch rib 9. The transverse tie - rods 8 and the transverse internal braces 6 connect each section of the middle arch rib 9 to form a certain transverse tie - cable force.

[0046] The longitudinal rigid locking structure includes longitudinal tie - rods 4 and longitudinal tie - rod bases 5; there are two groups of longitudinal tie - rods 4, which are respectively arranged on both sides of the middle arch rib 9; there are two in each group, which are respectively arranged at the upper and lower parts of the side of the middle arch rib 9. The longitudinal tie - rod bases 5 are welded to both sides of the middle arch rib 9 for connecting the longitudinal tie - rods 4 and the middle arch rib 9, with a total of eight, and their materials are the same as that of the middle arch rib 9. The longitudinal tie - rods 4 connect each section of the middle arch rib 9, and longitudinal cable forces are gradually applied to the longitudinal tie - rods until the linear attitude, stress, and cable force of the middle arch rib meet the specification requirements.

[0047] The present invention also discloses a construction method for vertically lifting and rigidly locking the arch ribs of a basket-type steel box arch bridge, comprising the following steps:

[0048] S1: Installation of one-side lifting bracket 1: After the installation of one side arch rib is completed, use a crane to install the one-side lifting bracket 1 and the hydraulic synchronous lifting system 2.

[0049] S2: Installation of the middle arch rib 9: On the concrete beam surface, affected by the position of the crane station, the middle arch rib bracket and each segment of the middle arch rib are installed in sequence, and the column foot of the middle arch rib bracket is fixed to the concrete beam body through the embedded steel plate. In order to restrict the horizontal thrust generated during the assembly of the middle arch rib 9, each segment of the middle arch rib 9 is firmly connected to the concrete bridge deck through rigid connection after assembly, and the rigid constraint is released before vertical lifting.

[0050] S3: Installation of the lifting bracket 1 on the other side: After the installation of the middle arch rib 9 is completed, the lifting bracket 1 on the other side and the hydraulic synchronous lifting system 2 are installed by using a crane.

[0051] S4: Transverse rigid locking of the middle arch rib 9: After the middle arch rib 9 is installed, the two ends are temporarily rigidly locked in the transverse direction; transverse tension bars 8 and transverse inner support rods 6 are set on the middle arch rib 9. The transverse tension bars 8 and the transverse inner support rod base 7 are made at the same time as the middle arch rib 9, and are fully penetrated and welded to the middle arch rib 9 and tested for weld flaws. Before the middle arch rib is lifted as a whole, the connection between the transverse tension bars and the inner support rods is completed, and a certain transverse tension cable force is set.

[0052] S5: Longitudinal rigid locking of the middle arch rib 9: After the middle arch rib 9 is installed, the middle arch rib 9 is temporarily locked longitudinally; longitudinal tie bars 4 are set on the middle arch rib 9. The longitudinal tie bar base 5 is made at the same time as the middle arch rib 9, and is fully welded to the middle arch rib 9 and subjected to weld flaw detection. Before the middle arch rib 9 is lifted as a whole, the connection of the longitudinal tie bars is completed, and the lifting cables are alternately used to apply cable forces to the longitudinal tie bars 4 step by step until the linear posture, stress, and cable force of the middle arch rib 9 meet the requirements of the specification.

[0053] S6: Middle arch rib 9 vertical rigid locking: After the middle arch rib 9 is installed, the middle arch rib 9 is temporarily locked vertically; the vertical lifting system is installed, and four lifting points are set on the middle arch rib 9. Before the middle arch rib 9 is lifted as a whole, the lifting cables are installed, and vertical cable forces are applied to the lifting cables step by step until the linear posture, stress, and cable force of the middle arch rib 9 meet the requirements of the specification.

[0054] S7: Gradual loading of the middle arch rib 9: When rigidly locked, the lifting cables are pre-tightened and the horizontal tension is completed. Then, the vertical lifting cable force is applied first and then the longitudinal cable force is applied for graded loading. Each time, the loading is carried out step by step in four times according to 25% of the design cable force, and the assembly bracket constraints are synchronously released from both ends to the middle of the span.

[0055] S8: Trial hoisting of the middle arch rib 9: The trial hoisting height is about 1.5 m, and relevant data such as the stress and strain of the arch rib, the deformation detection of the hoisting support, the stress detection of the concrete beam surface, and the four-point synchronism of the hoisting system are collected in real time. After the trial hoisting is completed, the longitudinal stay cables shall be protected when removing the assembled support and the stay cable hoisting interference members to prevent damage.

[0056] S9: Formal hoisting of the middle arch rib 9: The middle arch rib 9 is hoisted by a hydraulic synchronous hoisting system and hoisted in a cycle with a step distance of 300 mm. After each 6-step cycle is completed, the attitude of the steel arch rib is monitored and measured. If the four hoisting points are not synchronous, the hydraulic pump station will be automatically adjusted manually to complete the adjustment of a single-point arch rib.

[0057] S10: Closure of the middle arch rib 9 and the side arch ribs: The closure section construction adopts a dynamic adaptation process. A closure section perpendicular to the arch axis is set between the overall vertical hoisting section of the middle arch rib 9 and the in-situ assembled section of the side arch ribs, and there are four in total for the whole bridge.

[0058] S11: Relaxation of the longitudinal, transverse and vertical stay cables of the middle arch rib 9: After the installation, welding and flaw detection of the closure section are completed and qualified, the system conversion is completed. First, the constraints of the assembled section of the middle arch rib 9 are released, and then the middle arch rib 9 is relaxed in the reverse process. The horizontal cable force and the hoisting cable force are gradually and synchronously relaxed by 25%. The horizontal stay cables are carried out in an orderly, symmetric and uniform manner strictly following the relaxation sequence of the upper inner side → the upper outer side → the lower inner side → the lower outer side.

[0059] S12: Removal of auxiliary facilities: After the arch rib system conversion is completed, the middle arch rib support, the base 7 of the transverse internal bracing, the base 5 of the longitudinal tie bar, and the base 3 of the vertical hoist are removed. After the welds are ground and sprayed with anti-rust paint, the painting consistent with the arch rib is completed.

[0060] Before the overall hoisting of the present invention, the rigid locking in the longitudinal, transverse and vertical directions is completed, and the middle arch rib 9 is regarded as a whole component. Its strength, stiffness and stability all meet the specification requirements. The linear attitude, stress detection and camber of the middle arch rib 9 all meet the requirements. In the trial hoisting stage, the hoisting speed, four-point synchronism, stress monitoring of the arch rib, etc. all meet the specification requirements. During the hoisting process, the positions of the transverse tie bar 8, the transverse internal bracing 6, the longitudinal tie bar 4 and the vertical hoist base 3 are set reasonably, the connection positions with the middle arch rib 6 are reasonable, the longitudinal, transverse and vertical cable structures are designed reasonably, and the successive staged loading is reasonable. During the hoisting process, the longitudinal, transverse and vertical cable forces have no interference with the middle arch rib 9, ensuring the smooth, safe and controlled hoisting process.

[0061] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0062] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method for rigid locking of the overall vertical lifting of the arch rib in a basket-type steel box arch bridge, characterized in that, It includes the following steps: S1: Installation of the lifting support (1) on one side: After the side arch rib is installed, install the lifting support (1) on one side and the hydraulic synchronous lifting system (2); S2: Installation of the middle arch rib (9): Set up the middle arch rib support on the concrete beam surface for successively installing each segment of the middle arch rib (9); Release the rigid constraint of the middle arch rib (9) before vertical lifting; S3: Installation of the lifting support (1) on the other side: After the middle arch rib (9) is installed, use a crane to install the lifting support (1) on the other side and the hydraulic synchronous lifting system (2); S4: Transverse rigid locking of the middle arch rib (9): Horizontally and temporarily rigidly lock the two ends of the middle arch rib (9); Set the transverse tie bars (8) and transverse internal bracing bars (6) on the middle arch rib (9), and set a certain transverse cable tension; S5: Longitudinal rigid locking of the middle arch rib (9): Longitudinally and temporarily lock the middle arch rib (9); Set the longitudinal tie bars (4) on the middle arch rib (9); And alternately apply cable forces to the longitudinal tie bars (4) step by step with the lifting cables until the linear attitude, stress, and cable force of the middle arch rib (9) meet the specification requirements; S6: Vertical rigid locking of the middle arch rib (9): Vertically and temporarily lock the middle arch rib (9); Install the vertical lifting system and gradually apply vertical cable forces to the lifting cables until the linear attitude, stress, and cable force of the middle arch rib (9) meet the specification requirements; S7: Gradual loading of the middle arch rib (9): When rigidly locking, first pre-tighten the lifting cables and complete the transverse tensioning, and then load in stages by first applying the vertical lifting cable force and then the longitudinal cable force. Each time, load in four steps at 25% of the design cable force, and synchronously release the constraints of the assembly support from both ends to the mid-span; S8: Trial lifting of the middle arch rib (9): Lift it to a certain height for trial and collect data in real time; S9: Formal lifting of the middle arch rib (9): Lift the middle arch rib (9) as a whole, cycle and lift at a step distance of 300 mm. After each 6-step cycle is completed, monitor and measure the attitude of the steel arch rib; S10: Closure of the middle arch rib (9) and the side arch rib: The closure section construction adopts the dynamic adaptation process. Set the closure sections perpendicular to the arch axis between the overall vertical lifting section of the middle arch rib (9) and the in-situ assembly section of the side arch rib. There are four in total for the whole bridge; S11: Relaxation of the longitudinal, transverse, and vertical stay cables of the middle arch rib (9): After the closure section is installed, welded, and the flaw detection is qualified, complete the system conversion. First, release the constraints of the assembly section of the middle arch rib (9), and then relax the middle arch rib (9) in the reverse process; S12: Removal of auxiliary facilities: After the arch rib system conversion is completed, remove the middle arch rib support and the bases (7) of the transverse internal bracing bars, the bases (5) of the longitudinal tie bars, and the bases (3) of the vertical lifting. After the welds are ground and sprayed with anti-rust paint, complete the painting consistent with the arch rib.

2. The construction method for rigid locking of the overall vertical lifting of the arch rib in a basket-type steel box arch bridge according to claim 1, characterized in that, In S2, the column feet of the middle arch rib support are fixed to the concrete beam body through embedded steel plates.

3. The construction method for rigid locking of the overall vertical lifting of the arch rib in a basket-type steel box arch bridge according to claim 1, characterized in that, In S4, the transverse tie bars (8) and the bases (7) of the transverse internal bracing bars used to connect the transverse internal bracing bars (6) are fabricated simultaneously with the middle arch rib (9); The steel material of the bases of the transverse internal bracing bars is the same as that of the middle arch rib (9), and they are fully penetrated and welded to the middle arch rib (9) and the welds are subjected to flaw detection.

4. The construction method for rigid locking of the overall vertical lifting of the arch rib in a basket-type steel box arch bridge according to claim 3, characterized in that, There are two sets of the transverse tie bars (8) and the transverse internal bracing bars (6), which are respectively fixedly connected to the upper and lower sides of the middle arch rib (9). There are two bars in each set, and they are symmetrically arranged with respect to the central axis of the arch bridge.

5. The construction method for rigid locking of the overall vertical lifting of the arch rib in a basket-type steel box arch bridge according to claim 1, characterized in that, In S5, the longitudinal tie bar base (5) for connecting the longitudinal tie bars (4) is fabricated simultaneously with the middle arch rib (9), and is fully penetrated and welded to the middle arch rib (9) and the weld is subject to flaw detection.

6. The construction method for rigid locking of the overall vertical lifting of the arch rib in a basket-type steel box arch bridge according to claim 5, characterized in that, There are two sets of the longitudinal tie bars (4), which are respectively arranged on both sides of the middle arch rib (9); there are two bars in each set, which are respectively arranged at the upper and lower parts of the side surface of the middle arch rib (9).

7. The construction method for rigid locking of the overall vertical lifting of the arch rib in a basket - type steel box arch bridge according to claim 1, characterized in that, There are four sets of the lifting cables symmetrically arranged along the center of the middle arch rib (9), connecting the hydraulic synchronous lifting system (2) and the middle arch rib (9); there are 4 lifting points in total on the middle arch rib (9), and the hydraulic synchronous lifting system uses the lifting cables to integrally lift the middle arch rib (9).

8. The construction method for rigid locking of the overall vertical lifting of the arch rib in a basket-type steel box arch bridge according to claim 1, characterized in that, In S11, the tension release sequence of the middle arch rib (9): the horizontal cable force and the lifting cable force are gradually released synchronously by 25%. The horizontal stay cables are released in an orderly, symmetric and uniform manner strictly following the sequence of the upper inner side → the upper outer side → the lower inner side → the lower outer side.

9. An overall vertical lifting rigid locking device for the arch rib of a basket - type steel box arch bridge, which is used to implement the overall vertical lifting rigid locking construction method for the arch rib of the basket - type steel box arch bridge described in any one of claims 1 - 8, is characterized in that, It includes a middle arch rib support, a vertical lifting system, a transverse rigid locking structure and a longitudinal rigid locking structure; The middle arch rib support is arranged on the completed concrete bridge deck and is used for pre-assembling each segment of the middle arch rib (9); The vertical lifting system includes two sets of lifting brackets (1), a hydraulic synchronous lifting system (2), lifting cables and vertical lifting bases (3); the two sets of lifting brackets (1) are respectively erected on both sides of the middle arch rib (9), and the two sets of lifting brackets (1) are fixedly connected by a lifting top plate, and the hydraulic synchronous lifting system (2) is fixed on the lifting top plate; there are four sets of the vertical lifting bases (3) and the lifting cables symmetrically arranged along the center of the middle arch rib (9); the vertical lifting bases (3) are welded to the middle arch rib (9); one end of the lifting cable is connected to the hydraulic synchronous lifting system (2), and the other end is connected to the vertical lifting base (3); The transverse rigid locking structure includes transverse tie bars (8), transverse internal bracing bars (6) and transverse internal bracing bar bases (7); both sides of the transverse internal bracing bars (6) are connected to the inner side of the middle arch rib (9) through the transverse internal bracing bar bases (7); both ends of the transverse tie bars (8) are respectively fixedly connected to both ends of the middle arch rib (9); The longitudinal rigid locking structure includes longitudinal tie bars (4) and longitudinal tie bar bases (5); the longitudinal tie bar bases (5) are welded to both sides of the middle arch rib (9) and are used for connecting the longitudinal tie bars (4) and the middle arch rib (9).

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