A beam-arch combined bridge structure system conversion design and construction method

Abstract

The application discloses a kind of beam arch combined bridge structure system conversion design and construction method, it includes temporary consolidation device and temporary steel truss cable tower cable-stayed cantilever construction system, the temporary consolidation device is by layered steel box and steel plate reserved in steel box girder and bridge pier welding connection, and it is consolidated by tensioning steel strand;The temporary steel truss cable tower cable-stayed cantilever construction system is by steel truss cable tower, steel box girder temporary consolidation system, bridge installation section, back cable, cable and boom to form cable-stayed force system.The stress system conversion of construction stage of the application can realize the rapid construction of beam arch combined bridge, and form reliable construction stress system, ensure the safety of bridge structure in construction process, and the component design easy to disassemble can reduce the influence of construction auxiliary facilities on construction bridge.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, and particularly relates to a beam-arch combined bridge structure system conversion design and construction method. BACKGROUND

[0002] The through beam-arch combined bridge is a new type of bridge structure developed on the basis of the conventional concrete continuous bridge, and the birth of the through beam-arch combined bridge greatly improves the spanning capacity of the concrete bridge. Compared with the traditional continuous bridge, the through beam-arch combined bridge has many advantages, such as improving the structural bearing efficiency of the pier root section, reducing the mid-span stress and deflection, improving the stability and stress performance of the high pier, reducing the scale of the lower structure and foundation engineering, and improving the structural seismic performance.

[0003] The main components of the through beam-arch combined bridge include the steel box beam main beam, the arch rib and the suspender. The main stress mode is internal indeterminate, and the external stress mode is divided into the statically determinate simple support structure and the statically indeterminate continuous structure according to the arrangement form of the support and the design length of the main beam. The engineering relied on in the present application is the externally statically indeterminate continuous structure. The steel box beam main beam is mainly subjected to bending under the action of the external load; the arch rib is mainly subjected to compression under the action of the external load; the suspender is an important part connecting the steel box beam main beam and the arch rib, and is mainly subjected to tension under the action of the external load, and plays an important role in the internal force redistribution of the steel box beam main beam and the arch rib; in addition to the connection of the arch rib and the steel box beam main beam through the suspender, there is a complex structure of the beam-arch joint, which has double complexity of structure and stress, so the construction process is usually attributed to the steel box beam main beam segment to avoid the complexity of the welding process. The stress of such a bridge is clear and reasonable, and each component can fully play its material performance. However, due to the clear stress characteristics, the accuracy requirements of the construction process are relatively high, and the design elevation of each component needs to be accurately controlled.

[0004] Therefore, at present, such a combined bridge generally adopts a simple "beam first and arch later" construction method, that is, after the continuous beam construction is completed, the arch rib construction is carried out. The common "beam first and arch later" construction method is briefly introduced as follows:

[0005] (1) After the continuous main beam is constructed by means of full-support, jacking, hoisting and the like, full-support is erected on the main beam for the construction of the arch rib;

[0006] (2) After the continuous main beam is constructed by means of full-support, jacking, hoisting and the like, the arch rib is constructed on the continuous beam, and after the arch rib is completed, the left and right arch ribs are closed by vertical rotation.

[0007] However, this "beam first and arch later" construction method will undoubtedly cause long assembly time, many scattered parts and the like at the bridge site, and affect the construction efficiency. SUMMARY

[0008] The object of the present application is to solve the problems mentioned in the background art, and provide a beam-arch combined bridge structural system conversion design and construction method.

[0009] To solve the above technical problems, the technical scheme provided by the present application is: a beam-arch combined bridge structural system, which comprises a temporary consolidation device and a temporary steel truss tower cable-stayed cantilever system, the temporary consolidation device is welded and connected by layered steel boxes and steel plates reserved in the steel box girder and the bridge pier, and is consolidated by tensioning steel strands; the temporary steel truss tower cable-stayed cantilever construction system is composed of a steel truss tower, a steel box girder temporary consolidation system, a bridge installation segment, a back cable, a cable and a boom to form a cable-stayed force system, so as to ensure the safety and reliability of the construction process.

[0010] Further, the main body of the temporary consolidation device is welded by the inner and outer steel boxes, which not only ensures the reliability of the structure, but also provides convenience for subsequent structural system conversion, and only needs to cut the web of the steel box girder by using gas cutting to remove it.

[0011] Further, the temporary consolidation device is welded and tensioned by the pre-embedded steel plates and steel strands, which not only ensures the consolidation method, but also avoids excessive stiffness, so as to avoid excessive secondary internal forces of the temporary consolidation device under the action of temperature changes, concrete shrinkage and creep and other loads.

[0012] Further, the steel truss tower cable-stayed cantilever system can be constructed synchronously with the arch rib and the steel box girder tie beam, which not only ensures the safety of construction, but also greatly improves the construction efficiency.

[0013] Further, a large number of tie rods are used to fix the bridge segment, so as to ensure the safety during construction.

[0014] A conversion design and construction method of a beam-arch combined bridge structural system, comprising the following steps:

[0015] 1) The temporary consolidation device is formed by welding the inner and outer steel boxes to form the main structure of the device;

[0016] 2) The temporary consolidation device is welded with the pre-embedded steel plates of the steel box girder and the bridge pier, and the steel strands are tensioned to form a reliable consolidation system;

[0017] 3) The temporary steel truss tower is erected, and the cable-stayed tower structure in the cable-stayed system is formed by tensioning the back cable;

[0018] 4) The arch rib segment is hoisted by the lifting device of the temporary tower cable-stayed cantilever system, and after hoisting is completed, the cable is fixed, and the corresponding back cable is arranged at the back of the tower to ensure the safety performance of the construction structure;

[0019] 5) In the stage of installing the completed arch rib welding, the suspender is arranged, and the steel beam is constructed through the suspender, so that the beam and the arch are synchronously constructed, the construction efficiency is accelerated, and the construction safety is guaranteed;

[0020] 6) After the arch beam and the main beam beam closure, the steel strand and the steel box of the temporary consolidation device are removed, so that the structure system conversion is achieved;

[0021] 7) The symmetric welding construction of the steel beam on both sides of the beam is carried out, and the complete section of the steel box girder is formed;

[0022] 8) The temporary cable tower structure is removed;

[0023] 9) After the completion of the steel box girder section, the precast bridge deck is hoisted and the wet joint construction is carried out.

[0024] Compared with the prior art, the advantages of the present application are:

[0025] 1. Compared with the existing beam-arch combined bridge construction method, the beam-arch combined bridge structure system conversion design and construction method has the advantages that the beam and the arch are constructed synchronously, the construction efficiency is greatly improved, the temporary cantilever cable-stayed system is reasonable in stress, the auxiliary structure in the construction process is less, the construction operation surface can be greatly increased, and a convenient way is provided for bridge detection in the construction process;

[0026] 2. The beam-arch combined bridge structure system conversion design and construction method has the advantages that the temporary consolidation device is arranged between the steel box girder main beam and the pier, the temporary consolidation device is formed by layering steel box welding, and is welded with the steel box girder main beam and the pier embedded steel plate, so that a reliable stress device is formed in the construction process, the temperature load has little secondary internal force, and the removal process only needs to be carried out by simple gas cutting, which is convenient to remove and has little influence on the original bridge.

[0027] 3. The beam-arch combined bridge structure system conversion design and construction method has the advantages that the arch rib and the main beam segment of the bridge main body are hoisted and constructed through the cable tower, the back cable is arranged at the back of the cable tower, the back cable is anchored to the ground, the corresponding counterweight is arranged on the hoisting arm during hoisting, the bending moment balance at the center of the cable tower is ensured, and finally the corresponding back cable and back cable are arranged after each segment is installed in place, so that the stress in the construction process is clear, the structure is reliable, and the safety and construction efficiency in the construction process are guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic view of the present application.

[0029] Figure 2The steel box girder section schematic diagram of the present application is a through girder arch combination bridge.

[0030] Figure 3 The temporary consolidation device schematic diagram of the present application is a temporary consolidation device.

[0031] Figure 4 The temporary consolidation device schematic diagram of the present application is a temporary consolidation device. Figure 3 The local enlarged view of A in the present application.

[0032] Figure 5 The temporary cable tower device schematic diagram of the present application is a temporary cable tower device.

[0033] Figure 6 The first segment arch rib construction schematic diagram of the present application is a first segment arch rib construction schematic diagram.

[0034] Figure 7 The second segment arch rib construction schematic diagram of the present application is a second segment arch rib construction schematic diagram.

[0035] Figure 8 The third segment arch rib construction schematic diagram of the present application is a third segment arch rib construction schematic diagram.

[0036] Figure 9 The fourth segment arch rib construction schematic diagram of the present application is a fourth segment arch rib construction schematic diagram.

[0037] Figure 10 The temporary consolidation device schematic diagram of the present application is a temporary consolidation device. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0039] In the description of the embodiments of the present application, it should be noted that if the orientations or position relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or position relationships shown in the drawings, or are the orientations or position relationships when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0040] In addition, if the terms "horizontal", "vertical", "suspended" and the like are used, it does not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0041] In the description of embodiments of the present application, "a plurality of" represents at least 2.

[0042] In the description of embodiments of the present application, it should be further pointed out that, unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] As shown in the figure, a beam-arch combined bridge structure system, comprising a temporary consolidation device 1 and a temporary cable tower 2, the temporary consolidation device 1 is used to connect the steel box girder main beam 3 and the pier 4 during construction, the temporary cable tower 2 is consolidated at the bottom of the steel box girder main beam 3, the temporary consolidation device 1 and the temporary cable tower 2 form a cantilever hoisting system during construction, showing a partial cable-stayed bridge stress system, and the arch rib 5 segment and the steel box girder main beam 3 segment are hoisted;

[0044] The beam-arch combined segment of the steel box girder main beam 3 is welded with a top steel plate 6 at the bottom, and the pier 4 is welded with a bottom steel plate 7 at the top for welding connection with the temporary consolidation device 1;

[0045] The temporary consolidation device 1 is connected with the steel box girder main beam 3 and the pier 4 by anchoring connection through the welding of the top steel plate 6 and the bottom steel plate 7 and the setting of the steel strand 9 at the section center line 8, the temporary consolidation device 1 is composed of the same thickness of the large steel box 10 and the small steel box 11, the temporary consolidation device 1 needs to be treated by hole opening at the section center line to ensure that the steel strand 9 passes through the center line of the temporary consolidation device 1;

[0046] The bottom of the temporary cable tower 2 is anchored with the steel box girder main beam 3, and the back cable 12 is arranged to prevent the temporary cable tower 2 from losing stability, the angle between the back cable 12 and the temporary cable tower 2 is θ, 30°≤θ≤60°, one end of the boom 13 of the temporary cable tower 2 hoists the arch rib 5 segment and the steel box girder main beam 3 segment through the cable 14, and a counterweight 15 needs to be arranged at the other end of the boom 13 during hoisting to balance the bending moment of the temporary cable tower 2 at the center of the left and right ends of the boom 13, after the arch rib 5 segment is hoisted into place and welded, the corresponding cable 14 and back cable 12 are arranged, the cable 14 connects the arch rib 5 segment and the temporary cable tower 2, and one end of the back cable 12 is anchored and connected with the ground and the other end is connected with the temporary cable tower 2.

[0047] Two rows of hangers 16 are arranged on both sides of the arch rib 5, and the extension lines of the two hangers 16 at the same position are compared with the center line of the arch rib 5.

[0048] The hanger 16 is a flexible hanger 16, which includes a sling and a protective pipe, and the protective pipe is sleeved outside the sling.

[0049] The connecting part of the hanger 16 is provided with a waterproof cover, and a waterproof structure is arranged at the position where the steel box girder main beam 3 and the hanger 16 meet, the waterproof structure is arranged at the protruding position of the steel box girder main beam 3, and the protrusion has a slope, and the slope is not less than 2%.

[0050] The temporary consolidation device 1 and the temporary cable tower 2 form a cable-stayed force system during construction, and the beam-arch combined bridge is constructed symmetrically left and right.

[0051] A conversion design and construction method of a beam-arch combined bridge structure system, comprising the following steps:

[0052] 1) The temporary consolidation device 1 is formed by welding a large steel box 10 and a small steel box 11;

[0053] 2) The temporary consolidation device 1 is welded by welding with the pre-buried steel plate of the steel box girder main beam 3 and the pier 4, and is formed into a reliable consolidation system by tensioning the steel strand 9;

[0054] 3) The temporary steel truss temporary cable tower 2 is erected, and the temporary cable tower 2 structure in the cable-stayed system is formed by tensioning the back cable 12;

[0055] 4) The arch rib 5 segment is hoisted by the lifting device of the temporary cable tower 2 cable-stayed cantilever system, and after hoisting is completed, the cable 14 is fixed, and the corresponding back cable 12 is arranged at the back of the temporary cable tower 2 to ensure the safety performance of the construction structure;

[0056] 5) The temporary hanger 16 is arranged at the stage of installing and welding the arch rib 5, and the steel box girder main beam 3 segment is constructed through the temporary hanger 16, the beam and the arch are constructed synchronously to speed up the construction efficiency and ensure the construction safety;

[0057] 6) After the closure of the arch beam and the main beam tie beam, the steel web of the temporary consolidation device 1 is removed by simple gas cutting 18, achieving the purpose of structural system conversion;

[0058] 7) Symmetrical welding construction of the steel tie beam on both sides of the beam 17 is carried out to form a complete cross section of the steel box girder;

[0059] 8) Remove the temporary cable tower 2;

[0060] 9) After the completion of the steel box girder section, the precast bridge deck is hoisted and the wet joint is constructed.

[0061] The suspender 16 is constructed after the arch rib 5 segment is hoisted, welded and fixed in place, and the suspender 16 is a "permanent and temporary combination" device, which plays a role in fixing the main beam during construction, and plays a role in redistributing the internal force of the arch rib 5 and the main beam in the bridge stage; The tension of the suspender 16 is monitored after the completion of each segment construction.

[0062] The steel box girder main beam 3 segment is lifted to the design elevation by the hoisting arm 13 of the temporary cable tower 2, and is welded; after the steel box girder main beam 3 segment is welded, the suspender 16 is connected, and the initial tension F is set, F=800kN.

[0063] The temporary consolidation device 1 is removed after the closure of the steel box girder main beam 3 in the middle of the span, and the system conversion is completed from the cantilever cable-stayed construction system to the continuous rigid construction system; the steel wire 9 tension of the temporary consolidation device 1 is first released, and then the large steel box 10 and the small steel box 11 are cut; the steel wire 9 tension of the temporary consolidation device 1 is removed by the jack, and the clamping piece is taken out from the anchor ring by the jack; the steel box of the temporary consolidation device 1 is removed by gas cutting, first cutting the outer large steel box 10, and then cutting the inner small steel box 11; the large steel box 10 and the small steel box 11 of the temporary consolidation device 1 need to monitor the elevation of the bridge after cutting to ensure that the elevation change is less than 2mm.

[0064] In the specific implementation of the present application, as shown in Figure 1 The object of the present application is a through girder arch combination bridge, which includes arch ribs, steel main beams, suspenders and piers. The temporary steel box girder consolidation device designed by the present application is located at the connection position of the arch rib and the pier.

[0065] As shown in Figure 2 It is a steel box girder cross section diagram. During the steel tie beam processing, the steel plate is pre-buried at the bottom of the box girder for welding with the temporary consolidation device. The tie beam part in the figure will be hoisted and welded after the closure of the arch rib and the main beam.

[0066] As shown in Figure 3 , Figure 4As shown, the temporary consolidation device is formed by tensioning steel strands and welding upper and lower steel plates to form a consolidation system. The main body of the consolidation device is formed by a multi-layer steel box, with a large steel box surrounding a small steel box, and the layers are welded together. The specific welding process is to weld the small steel box first, then the large steel box, and then weld with the upper and lower steel plates of the temporary support. This method can reduce the influence of temperature changes and concrete hydration heat on the internal forces of the bridge segment components, and is convenient for disassembly after the conversion of the structural system, only the steel box web needs to be gas cut.

[0067] As shown in Figure 5 , the temporary cable tower is composed of a cable tower body, a back cable, a cable, and a crane arm. The back cable is used to stabilize the temporary cable tower structure and ensure stability during construction. One end of the back cable is connected to the cable tower, and the other end is anchored to the ground. The cable is used to connect the cable tower and the arch rib stage to ensure the stability of the arch rib stage during construction. The cable and the back cable need to be added after the completion of each segment construction to meet the structural reliability and safety requirements. One end of the crane arm is provided with a lifting device for lifting the arch rib segment and the steel box girder main girder segment, and the other end is used to place counterweights to balance the bending moment of the cable tower center.

[0068] As shown in Figure 6 to Figure 9 , the temporary steel truss beam cantilever cable-stayed construction system is used to construct the arch rib and main girder segments. The main principle of the force is that the arch rib segment components make the cable tower bear pressure and the back cable bear tension through the cable, which makes the clear force system more clear for safety control during construction. The steel main girder system is fixed and constructed through the suspender on the arch rib segment. The specific construction sequence is as follows: (1) After the temporary consolidation device and the cable tower and its back cable are installed, the first segment of the arch rib is lifted; (2) After the first stage of arch rib lifting is completed, the cable of the arch rib stage and the corresponding back cable are fixed; (3) The suspender is constructed to lay the foundation for the subsequent main girder segment lifting; (4) The main girder segment lifted into position is anchored and connected with the suspender, and an initial tension of 800 kN is set for the suspender. The tension needs to be monitored and adjusted during construction to ensure the reliability and safety of the bridge construction; (5) Repeat the above steps to construct the subsequent segments, and the segment construction is symmetrical. This beam and arch synchronous construction force system helps to improve the construction efficiency of the bridge, and also improves the safety during construction and reduces the impact on the navigation under the bridge.

[0069] As shown in Figure 10As shown in the figure, the temporary consolidation device is released from the constraint, and the constraint is released under the condition that the overall stress of the bridge is reliable, and the specific constraint sequence is as follows: (1) the steel strand at the top of the box girder is first released, and the clamp is taken out from the anchor ring by using the jack to release the constraint force of the steel strand; (2) the rigid connection between the temporary support and the bottom plate of the box girder is released by using gas cutting, and the specific method is to cut the multilayer steel box layer by layer slowly, and the change of the box girder needs to be observed after each layer is cut until the box girder and the temporary support are completely separated; (3) the elevation before and after the constraint is released is observed, and the change of the elevation before and after the constraint is controlled within 2mm.

[0070] The above describes the present application and its embodiments, which is not limited, and the figure only shows one of the embodiments of the present application, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the purpose of the present application, similar structure and embodiments can be designed without creativity, which shall belong to the protection scope of the present application.

Claims

1. A beam-arch hybrid bridge structural system, characterized by: The temporary consolidation device is used for connecting the steel box girder main beam and the pier during construction, and the temporary cable tower is consolidated at the bottom of the steel box girder main beam, and the temporary consolidation device and the temporary cable tower form a cantilever hoisting system during construction, present a partial cable-stayed bridge stress system, and hoist the arch rib segment and the steel box girder main beam segment; The beam arch combined segment of the steel box girder main beam is welded with a top steel plate at the bottom, and the pier is welded with a bottom steel plate at the top for welding connection with the temporary consolidation device; The temporary consolidation device is anchored and connected with the steel box girder main beam and the pier through welding with the top steel plate and the bottom steel plate, and is provided with a steel strand at the center line of the cross section for anchoring connection, the temporary consolidation device is composed of an inner and outer two-layer large steel box and a small steel box, the steel plate thicknesses of the large steel box and the small steel box are the same, the temporary consolidation device needs to be processed by hole opening at the center line to ensure that the steel strand passes through the center line of the temporary consolidation device; The bottom of the temporary cable tower is anchored with the steel box girder main beam, and a back cable is arranged to prevent instability of the temporary cable tower, the inclination angle of the back cable and the temporary cable tower is θ, 30°≤θ≤60°, one end of a hoisting arm of the temporary cable tower hoists the arch rib segment and the steel box girder main beam segment through a cable, a counterweight is arranged at the other end of the hoisting arm during hoisting to balance the bending moment of the hoisting arm at the center of the temporary cable tower, corresponding cables and back cables are arranged after the arch rib segment is hoisted into position and welded, the cables connect the arch rib segment and the temporary cable tower, and one end of the back cable is anchored and connected with the ground and the other end is connected with the temporary cable tower; Two rows of hangers are arranged on both sides of the arch rib, and the extension lines of the two hangers at the same position intersect at the center line of the arch rib; The hanger is a flexible hanger, which comprises a sling and a protective pipe, and the protective pipe is sleeved outside the sling; A waterproof cover is arranged at the connecting position of the hanger, and a waterproof structure is arranged at the connection between the steel box girder main beam and the hanger, the waterproof structure is arranged at the protruding position of the steel box girder main beam, and the protrusion has a slope.

2. The beam-arch combined bridge structure system according to claim 1, characterized in that: The temporary consolidation device and the temporary cable tower form a cable-stayed stress system during construction, and are used for left-right symmetrical construction of the beam-arch combined bridge.

3. A conversion design and construction method for the beam-arch composite bridge structure system of any one of claims 1-2, characterized in that, The method comprises the following steps: 1) the temporary consolidation device is formed by welding a large steel box and a small steel box; 2) the temporary consolidation device is welded with the pre-buried steel plate of the steel box girder main beam and the pier, and a steel strand is tensioned to form a reliable consolidation system; 3) a temporary steel truss temporary cable tower is erected, and a back cable is tensioned to form a temporary cable tower structure in the cable-stayed system; 4) the arch rib segment is hoisted by a lifting device of the temporary cable-stayed cantilever system, and after hoisting is completed, the cables are fixed, and corresponding back cables are arranged at the back of the temporary cable tower to ensure the safety performance of the construction structure; 5) a temporary hanger is arranged at the installed and welded arch rib segment, and the steel box girder main beam segment is constructed through the temporary hanger, so that the beam and the arch are constructed synchronously to accelerate the construction efficiency and ensure the construction safety; 6) after the arch beam and the main beam system beam are closed, the steel web of the temporary consolidation device is removed by a simple gas cutting method to achieve the purpose of structure system conversion. 7) Perform symmetrical welding construction of the side beams on both sides of the steel girder system beam to form a complete cross section of the steel box girder; 8) Remove the temporary cable tower; 9) After the completion of the steel box girder cross section, hoist and wet joint construction of the prefabricated bridge deck.

4. The conversion design and construction method of a beam-arch combined bridge structure system according to claim 3, characterized in that: The suspender is constructed after the arch rib segment is hoisted, welded and fixed in place. The suspender is a "permanent and temporary combination" device, which plays a role in fixing the main girder during construction and redistributes the internal forces of the arch rib and the main girder during the bridge completion stage. The suspender tension is monitored after the completion of each segment construction.

5. The conversion design and construction method of a beam-arch combined bridge structure system according to claim 4, characterized in that: The steel box girder main girder segment is lifted to the design elevation by the hoist arm of the temporary cable tower and is welded. After the completion of the steel box girder main girder segment welding, the suspender is connected and the initial tension F is set, F = 800 kN.

6. The conversion design and construction method of a beam-arch combined bridge structure system according to claim 5, characterized in that: The temporary consolidation device is removed after the closure of the steel box girder main girder in the span, completing the system conversion from the cantilever cable-stayed construction system to the continuous rigid frame force system. The temporary consolidation device first releases the steel strand tension and then cuts the large steel box and the small steel box. The steel strand tension of the temporary consolidation device is removed by a jack, which takes out the clamping piece from the anchor ring one by one. The steel box of the temporary consolidation device is removed by gas cutting, which first cuts the outer large steel box and then cuts the inner small steel box. The elevation of the bridge needs to be monitored when the large steel box and the small steel box are cut off to ensure that the elevation change is less than 2 mm.

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