Concrete-filled steel tube arch bridge and construction method thereof

Abstract

The invention discloses a concrete-filled steel tube arch bridge and a construction method thereof. The construction method comprises the steps that the longitudinal frameworks are assembled, and the main arches, the wind braces and the temporary cross beams are installed to form a stiff framework system; a guide beam and a temporary buttress are installed at one end of the stiff skeleton system; pushing the stiff skeleton system; the stiff framework system is used as a support, and concrete of arch feet and end cross beams is poured; pouring concrete of the main arch and the straining beam; and installing the middle cross beam, the suspender and the carriageway plate. According to the embodiment of the invention, the stiff skeleton system not only can provide support and templates for the arch bridge girder during the construction period, but also can participate in structural stress during the operation period, so that the reinforcement quantity of the structure is reduced, the weight is light, the rigidity is high, and the requirement on pushing equipment is reduced. The concrete straining beam is low in manufacturing cost, good in durability and easy to maintain in the operation period. And temporary facilities such as supports do not need to be arranged, the engineering cost can be effectively reduced, the construction risk is reduced, the construction period is shortened, and economic benefits are brought to bridge construction.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a steel tube concrete arch bridge and a construction method thereof. Background Art

[0002] As a new technology for modern bridge construction, steel tube concrete arch bridge has been widely used in highway and municipal bridge projects due to its unique advantages. The structure has light weight, high strength and strong anti-deformation ability, which effectively solves the contradiction of saving materials, easy installation, simple construction and large bearing capacity in bridge construction. It is especially suitable for cross-channel and road projects with special requirements for structure height and landscape.

[0003] In terms of construction methods, there are many technologies for steel tube concrete arch bridges, including the bracket method, rotation construction method, inclined-stayed buckle hanging method, floating hoisting method and jacking method. These methods have their own characteristics. For example, although the bracket method is common, it has a greater impact on traffic during construction and is costly; the rotation construction method and the inclined-stayed buckle hanging method are complex and relatively risky; the floating hoisting method requires large ships and has safety hazards. The jacking method is increasingly favored by the engineering industry for its characteristics of being fast, environmentally friendly and having little impact on existing traffic. However, the jacking method has limitations in its application, especially for steel tube concrete arch bridges using concrete tie beams. Since the concrete tie beams are heavy, usually exceeding 1,500 tons, which exceeds the jacking capacity of existing jacking equipment, the jacking method cannot be used for construction, which has imposed certain restrictions on the promotion and application of steel tube concrete arch bridges.

[0004] In summary, the existing construction of steel tube concrete arch bridges has technical problems that affect traffic, complex processes, high costs, high risks, and great limitations. Summary of the invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies, propose a steel tube concrete arch bridge and its construction method, and solve the technical problems in the prior art that affect traffic, have complex processes, high costs, high risks, and great limitations.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions: In a first aspect, the present application provides a construction method of a steel tube concrete arch bridge, comprising the following steps: Assemble the longitudinal frame, install the main arch, wind bracing, and temporary beams to form a rigid frame system; Installing a guide beam and a temporary buttress at one end of the rigid skeleton system; Pushing the rigid skeleton system; Using the rigid skeleton system as support, pouring concrete for the arch foot and end beams; pouring concrete of the main arch and tie beam; Install the center beam, hanger and carriageway slab.

[0007] In some embodiments of the present application, the construction method further includes: Carry out bridge substructure construction and level the site around the bridge.

[0008] In some embodiments of the present application, the pushing of the rigid skeleton system includes: The rigid frame system is pushed along the extension direction of the guide beam until the temporary pier supports the rigid frame system, and the guide beam is removed.

[0009] In some embodiments of the present application, the concrete of the arch foot and the end beam is poured with the rigid skeleton system as support, including: Inserting the end cross beam steel bundle and pouring the end cross beam concrete outside the end cross beam steel bundle; tensioning the end beam steel strands; The end cross beam steel strand is anchored on the end cross beam concrete.

[0010] In some embodiments of the present application, the pouring of concrete of the main arch and the tie beam includes: Symmetrically installing the steel pipes of the main arch; sequentially pouring concrete in the lower steel pipe and concrete in the upper steel pipe to form the main arch; Installing a tie beam formwork on each of the longitudinal frames; The tie beam concrete is poured in the tie beam formwork.

[0011] In some embodiments of the present application, the installation of the crossbeam, the hanger and the roadway slab includes: Installing a middle cross beam between the main arch concrete and the tie beam concrete; pouring wet joint concrete at the connection between the middle cross beam and the tie beam concrete; A prestressed bundle is arranged in the middle cross beam, and the prestressed bundle is tensioned.

[0012] In some embodiments of the present application, the installation of the crossbeam, the hanger and the roadway slab includes: After the installation of the suspension rod is completed, the suspension rod is tensioned for the first time; pouring bridge deck concrete on the carriageway slab; When the bridge deck concrete reaches a preset strength, the hanger is tensioned for a second time.

[0013] In a second aspect, the present application further provides a steel tube concrete arch bridge, using a construction method of a steel tube concrete arch bridge as described in any one of the embodiments of the first aspect, comprising: Bridge substructure support; A bridge superstructure is arranged on the bridge lower support structure, the bridge superstructure comprises a tie rod, a middle cross beam, an end cross beam and a rigid skeleton system, the middle cross beam connects two tie rods arranged oppositely, the rigid skeleton system is arranged inside the tie rod, and the end cross beam connects two main arches arranged oppositely in the rigid skeleton system; Among them, the rigid frame system also includes a longitudinal frame, a temporary crossbeam, a wind brace, and an outer steel pipe of the hanger. The longitudinal frame is parallel to the extension direction of the tie rod. The temporary crossbeam connects the two relatively arranged longitudinal frames. The wind brace is connected to the main arch. The two ends of the outer steel pipe of the hanger are respectively connected to the main arch and the longitudinal frame.

[0014] In some embodiments of the present application, angle steels, connecting steel plates, stiffening steel plates and diagonal braces are also included, wherein the angle steels are arranged at the four corners of the longitudinal frame, the connecting steel plates connect adjacent angle steels horizontally or vertically, the stiffening steel plates are perpendicularly connected to the axis of the longitudinal frame, and the diagonal braces are arranged on the stiffening steel plates.

[0015] In some embodiments of the present application, the main arch includes an upper steel pipe, a lower steel pipe and a steel web, the lower steel pipe and the upper steel pipe are stacked, the two ends of the steel web are respectively connected to the lower steel pipe and the upper steel pipe, and the upper steel pipe and the lower steel pipe are filled with concrete.

[0016] Compared with the prior art, the technical solution provided by this application has the following beneficial technical effects: The embodiment of the present application can not only provide support and formwork for the main beam of the arch bridge during the construction period through the rigid skeleton system, but also participate in the structural stress during the operation period, reduce the amount of reinforcement of the structure, and avoid waste of construction materials. At the same time, the integral rigid skeleton system has the advantages of light weight and high rigidity, which can reduce the requirements for the jacking equipment during the jacking process, and the construction difficulty is small and the construction risk is low. The main beam of the steel tube concrete arch bridge can adopt steel main beams or concrete tie beams. The concrete tie beams have the advantages of low cost, good durability, and simple maintenance during the operation period. When constructing a steel tube concrete arch bridge, the steel tube concrete arch bridge can be quickly constructed without support. There is no need to set up large temporary facilities such as supports, swivel facilities, cable cranes, floating cranes, etc., which can effectively reduce the project cost, reduce construction risks, shorten the construction period, and bring greater economic benefits to bridge construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution in this application, the following is a brief introduction to the drawings required for use in the embodiments: Figure 1 It is a flow chart of a construction method of a steel tube concrete arch bridge provided in an embodiment of the present application; Figure 2A~2B It is a structural schematic diagram of a steel tube concrete arch bridge provided in an embodiment of the present application; Figure 3A~3B It is a structural schematic diagram of a longitudinal skeleton provided in an embodiment of the present application; Figure 4 It is a structural schematic diagram of a temporary beam provided in an embodiment of the present application; Figure 5 It is a structural schematic diagram of a main arch provided in an embodiment of the present application; Figures 6A to 6C It is a structural schematic diagram of a guide beam provided in an embodiment of the present application.

[0018] Reference numerals: 1-longitudinal skeleton; 2-temporary cross beam; 3-main arch, 4-outer steel pipe of hanger, 5-guide beam, 6-temporary pier; 11- angle steel, 12- connecting steel plate, 13- stiffening steel plate, 14- diagonal brace, 15- first strain gauge; 21- horizontal brace of cross beam, 22- vertical brace of cross beam, 23- diagonal brace of cross beam; 31-upper steel pipe, 32-lower steel pipe, 33-steel web, 34-filled concrete, 35-second strain gauge; 51 -upper steel plate, 52 -lower steel plate, 53 -side steel plate, 54 -cross partition, 55 -side steel plate diagonal brace, 56 -first stiffening plate, 57 -steel pad, 58 -second stiffening plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] Those skilled in the art will appreciate that in this specification, the wording "including" is an open-ended expression, which means that the described features exist but does not exclude other features. The directional words "up", "down", "left", "right", etc. are exemplary directions based on the drawings. Features defined as "first" and "second" implicitly include one or more of the features. Singular expressions can also be used in the plural. "Multiple" means two or more. The terms "installed", "connected", and "connected" can be fixed connections, detachable connections, or integrated connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. In addition, "connected" can include wireless connections.

[0021] The purpose of this application is to overcome the above-mentioned technical deficiencies, propose a steel tube concrete arch bridge and its construction method, and solve the technical problems in the prior art that affect traffic, have complex processes, high costs, high risks, and great limitations.

[0022] In order to achieve the above technical objectives, this application adopts the following technical solutions: In a first aspect, the present application provides a construction method for a steel tube concrete arch bridge, such as Figure 1 As shown, Figure 1 It is a flow chart of a construction method of a steel tube concrete arch bridge provided in an embodiment of the present application.

[0023] A construction method for a steel tube concrete arch bridge comprises the following steps: S1. Assemble the longitudinal frame 1, and install the main arch 3, wind bracing, and temporary beam 2 to form a rigid frame system; S2. Install the guide beam 5 and the temporary buttress 6 at one end of the rigid skeleton system; S3. Pushing the rigid skeleton system; S4. Using the rigid skeleton system as support, pouring concrete for the arch foot and end beams; S5. Pouring concrete of the main arch 3 and tie beam; S6. Install the center beam, hanger and carriageway slab.

[0024] The embodiment of the present application can not only provide support and formwork for the main beam of the arch bridge during the construction period through the rigid skeleton system, but also participate in the structural stress during the operation period, reduce the amount of reinforcement of the structure, and avoid waste of construction materials. At the same time, the integral rigid skeleton system has the advantages of light weight and high rigidity, which can reduce the requirements for the jacking equipment during the jacking process, and the construction difficulty is small and the construction risk is low. The main beam of the steel tube concrete arch bridge can adopt steel main beams or concrete tie beams. The concrete tie beams have the advantages of low cost, good durability, and simple maintenance during the operation period. When constructing a steel tube concrete arch bridge, the steel tube concrete arch bridge can be quickly constructed without support. There is no need to set up large temporary facilities such as supports, swivel facilities, cable cranes, floating cranes, etc., which can effectively reduce the project cost, reduce construction risks, shorten the construction period, and bring greater economic benefits to bridge construction.

[0025] In some embodiments of the present application, the construction method further includes: Carry out bridge substructure construction and level the site around the bridge.

[0026] In this embodiment, the tie beam longitudinal skeleton 1, the hanger steel pipe and the main arch 3 are welded into a whole around the bridge position, and the wind bracing and temporary cross beam 2 are installed to form an integral rigid skeleton system with light weight and high rigidity.

[0027] The number of longitudinal skeletons 1 corresponds to the number of tie beams in the design drawings of the steel tube concrete arch bridge to be built. In this embodiment, there are two pieces, and the outer contour of the rigid skeleton is 4 cm away from the edge of the tie beam concrete to reserve a concrete protective layer.

[0028] In some embodiments of the present application, the pushing of the rigid skeleton system includes: The rigid frame system is pushed along the extension direction of the guide beam 5 until the temporary pier 6 bears the rigid frame system, and the guide beam 5 is removed.

[0029] In this embodiment, during construction, a guide beam 5 is installed on the longitudinal frame 1 along the jacking direction to reduce the maximum cantilever length of the integral rigid frame system during the jacking process, improve the force during the construction process, and play a guiding role. After the integral rigid frame system and the guide beam 5 are jacked across the existing waterway and road by the jacking method, the longitudinal frame 1 is used as a casting template support system for the concrete tie beam to complete the casting construction of the tie beam.

[0030] After the integral rigid frame system is installed around the bridge site, the guide beam 5 is installed, and after temporary piers 6 are set on both sides of the existing road or waterway, the integral rigid frame system is pushed into place by the jacking method, and the guide beam 5 is removed.

[0031] The steel guide beam 5 is arranged corresponding to the rigid frame, and its external contour size is the same as that of the rigid frame. The steel guide beam 5 is integrally formed by full penetration welding at the joint.

[0032] In some embodiments of the present application, the concrete of the arch foot and the end beam is poured with the rigid skeleton system as support, including: Inserting the end cross beam steel bundle and pouring the end cross beam concrete outside the end cross beam steel bundle; tensioning the end beam steel strands; The end cross beam steel strand is anchored on the end cross beam concrete.

[0033] In this embodiment, the longitudinal skeleton 1, in addition to serving as a support system for the concrete tie beam casting formwork, also serves as a load-bearing component during the construction period to bear the deadweight of the tie beam before the prestressed steel strands are tensioned; the integral rigid skeleton system, in addition to serving as a construction aid during the construction period, can also participate in structural stress during the operation period, thereby reducing the amount of reinforcement in the tie beam concrete structure.

[0034] On the outside of the integral rigid frame, strain gauges and thermometers for monitoring are installed as needed to realize real-time monitoring of the deformation, stress, strain, temperature, etc. of the bridge during the construction and operation periods.

[0035] In some embodiments of the present application, the pouring of concrete of the main arch 3 and the tie beam includes: Symmetrically install the steel pipes of the main arch 3; sequentially pouring concrete in the lower steel pipe and concrete in the upper steel pipe to form the main arch 3; Install a tie beam template on each of the longitudinal frames 1; The tie beam concrete is poured in the tie beam formwork.

[0036] In this embodiment, the integral rigid frame is used as support and formwork, the arch foot and end cross beam concrete are cast in situ, and the end cross beam steel strands are tensioned. The concrete in the steel pipe of the main arch 3 is poured in sequence, and the left and right main arches 3 are required to be symmetrically pressed. The pouring sequence can be the lower steel pipe first, then the upper steel pipe. With the integral rigid frame as support, the tie beam formwork is installed on the rigid frame, and the tie beam concrete is poured.

[0037] In some embodiments of the present application, the installation of the crossbeam, the hanger and the roadway slab includes: Installing a middle cross beam between the main arch 3 concrete and the tie beam concrete; pouring wet joint concrete at the connection between the middle cross beam and the tie beam concrete; A prestressed bundle is arranged in the middle cross beam, and the prestressed bundle is tensioned.

[0038] In some embodiments of the present application, the installation of the crossbeam, the hanger and the roadway slab includes: After the installation of the suspension rod is completed, the suspension rod is tensioned for the first time; pouring bridge deck concrete on the carriageway slab; When the bridge deck concrete reaches a preset strength, the hanger is tensioned for a second time.

[0039] In a second aspect, the present application also provides a steel tube concrete arch bridge, such as Figure 2A-2B As shown, Figure 2A-2B It is a structural schematic diagram of a steel tube concrete arch bridge provided in an embodiment of the present application. Figure 2A For the main view, Figure 2B This is a top view.

[0040] A steel tube concrete arch bridge, using the construction method of the steel tube concrete arch bridge according to any one of the embodiments of the first aspect, comprising: Bridge substructure support; The bridge superstructure is arranged on the lower supporting structure of the bridge, and the bridge superstructure includes a tie rod, a middle cross beam, an end cross beam and a rigid skeleton system. The rigid skeleton system is arranged inside the tie rod, the middle cross beam connects two tie rods arranged oppositely, the end cross beam connects two main arches 3 arranged oppositely in the rigid skeleton system, and the tie rod is located below the main arch 3; Among them, the rigid frame system also includes a longitudinal frame 1, a temporary crossbeam 2, a wind brace, and an outer steel pipe 4 of a hanger. The longitudinal frame 1 is parallel to the extension direction of the tie rod. The temporary crossbeam 2 connects the two relatively arranged longitudinal frames 1. The wind brace is connected to the main arch 3. The two ends of the outer steel pipe 4 of the hanger are respectively connected to the main arch 3 and the longitudinal frame 1.

[0041] like Figure 3A~3B As shown, Figure 3A~3B It is a schematic diagram of the structure of a longitudinal skeleton 1 provided in an embodiment of the present application. Figure 3A For the section without diagonal bracing 14, Figure 3B The cross section for setting the diagonal brace 14.

[0042] In this embodiment, the longitudinal skeleton 1 is arranged along the length direction of the concrete tie rod of the bridge, and equilateral angles with a side length of 250 mm are set at the four corners 4 cm away from the concrete edge of the tie rod. The angle steels 11 are welded as a whole through the vertical connecting steel plates 12 and the horizontal connecting steel plates 12 arranged at intervals. The connecting steel plates 12 are set at intervals of about 2m in the arch foot area; and one is set at 1m on both sides of each suspension rod within the range of the tie rod and at the center of the adjacent suspension rod. In addition, the rigidity of the longitudinal skeleton 1 during the top-pushing construction is strengthened to ensure the safety of the structure. According to the force requirements, two stiffening steel plates 13 are set every 5m along the vertical steel plate equilateral angle steel 11 of the longitudinal skeleton 1, and diagonal braces 14 are set between the stiffening steel plates 13. The diagonal braces 14 are composed of L75x50x8 angle steels 11. The first strain gauge 15 for monitoring can be a vibrating wire strain gauge, which is set at the end of the tie beam, 1 / 4 span, and the cross section in the span.

[0043] like Figure 4 As shown, Figure 4 It is a schematic structural diagram of a temporary beam 2 provided in an embodiment of the present application.

[0044] Seven temporary cross beams 2 are arranged at equal intervals between the longitudinal frames 1 , and the temporary cross beams 2 are composed of cross beam horizontal braces 21 , cross beam vertical braces 22 , and cross beam diagonal braces 23 .

[0045] In some embodiments of the present application, angle steels 11, connecting steel plates 12, stiffening steel plates 13 and diagonal braces 14 are also included, wherein the angle steels 11 are arranged at the four corners of the longitudinal skeleton 1, the connecting steel plates 12 connect adjacent angle steels 11 horizontally or vertically, the stiffening steel plates 13 are perpendicularly connected to the axis of the longitudinal skeleton 1, and the diagonal braces 14 are arranged on the stiffening steel plates 13.

[0046] like Figure 5 As shown, Figure 5 It is a structural schematic diagram of a main arch 3 provided in an embodiment of the present application.

[0047] In some embodiments of the present application, the main arch 3 includes an upper steel pipe 31, a lower steel pipe 32 and a steel web 33. The lower steel pipe 32 is stacked with the upper steel pipe 31. Both ends of the steel web 33 are respectively connected to the lower steel pipe 32 and the upper steel pipe 31. The upper steel pipe 31 and the lower steel pipe 32 are filled with concrete 34.

[0048] In this embodiment, the main arch 3 is composed of an upper steel pipe 31, a lower steel pipe 32, a steel web 33 arranged between the upper and lower steel pipes, and concrete 34 filled in the steel pipe. The second strain gauge 35 for monitoring can be a vibrating wire strain gauge, which is arranged at the arch foot, 1 / 4 span, and mid-span section of the main arch 3.

[0049] The outer steel pipe 4 of the hanger is made of Φ180 seamless steel pipe, which is arranged on the outside of the hanger. The upper part is connected to the main arch 3, and the lower part is connected to the longitudinal frame 1. Before the hanger is installed and tensioned, the weight borne by the longitudinal frame 1 is transferred to the main arch 3, playing a role of common force.

[0050] like Figures 6A to 6C As shown, Figures 6A to 6C It is a schematic diagram of the structure of a guide beam 5 provided in an embodiment of the present application. Fig. 6A For the elevation drawing, Figure 6B For the plan view, Figure 6C For the structure diagram.

[0051] The steel guide beam 5 is arranged corresponding to the longitudinal frame 1 and welded into a whole, so as to reduce the maximum cantilever length of the integral rigid frame system during the jacking process and play a guiding role. A temporary cross beam 2 is arranged between the two steel guide beams 5E. The steel guide beam 5 is welded into a steel plate box by an upper steel plate 51, a lower steel plate 52, and a side steel plate 53. A cross partition 54 is arranged every 2m in the steel plate box. A side steel plate diagonal brace 55 made of angle steel 11 is arranged between the cross partitions 54. The side steel plate 53 is usually provided with a first stiffening plate 56. A steel pad 57 is welded at the bottom of the side steel plate 53 of the steel plate box, and a second stiffening plate 58 is arranged between the lower steel plate 52.

[0052] This embodiment can realize the rapid construction of a steel tube concrete arch bridge using concrete tie beams without a support, and the construction method does not occupy the existing traffic. It has the advantages of low construction difficulty, short construction period and low cost; and the deformation, stress, strain, temperature, etc. of the bridge can be monitored in real time during the construction period and operation period.

[0053] The main beam of the steel tube concrete arch bridge can be a steel main beam or a concrete tie beam. The concrete tie beam has the advantages of low cost, good durability, and simple maintenance during the operation period, so it is widely used in bridge engineering. However, due to the heavy weight of the concrete tie beam, in this embodiment, a span of 120m, a bridge width of 17m, and a steel tube concrete arch bridge using a concrete tie beam, the weight of the tie beam reaches 1780 tons. When crossing the existing waterway or road, based on the existing construction conditions, it is impossible to adopt a top-pushing construction scheme with little impact on the existing traffic. The present invention designs a set of integral rigid skeleton system to realize the top-pushing of the steel tube concrete arch bridge with a concrete tie beam across the existing waterway or road.

[0054] This embodiment proposes a fast construction method without support, which can realize the fast construction of a steel tube concrete arch bridge without support when constructing a steel tube concrete arch bridge across an existing waterway or existing road. It does not need to set up large temporary facilities such as supports, rotating facilities, cable cranes, floating cranes, etc., which can effectively reduce the project cost, reduce construction risks, shorten the construction period, and bring greater economic benefits to bridge construction.

[0055] In addition to serving as construction support and formwork during the construction period, the integral rigid frame can also participate in the structural stress during the operation period, reduce the amount of structural reinforcement, and avoid waste of construction materials. At the same time, the integral rigid frame has the advantages of light weight and high rigidity. During the jacking process, it can reduce the requirements for jacking equipment, and the construction difficulty and risk are low.

[0056] The monitoring system set up by the integral rigid frame system can monitor the health of the bridge in real time to ensure the safety of the bridge.

[0057] Compared with the prior art, the technical solution provided by this application has the following beneficial technical effects: The embodiment of the present application can not only provide support and formwork for the main beam of the arch bridge during the construction period through the rigid skeleton system, but also participate in the structural stress during the operation period, reduce the amount of reinforcement of the structure, and avoid waste of construction materials. At the same time, the integral rigid skeleton system has the advantages of light weight and high rigidity, which can reduce the requirements for the jacking equipment during the jacking process, and the construction difficulty is small and the construction risk is low. The main beam of the steel tube concrete arch bridge can adopt steel main beams or concrete tie beams. The concrete tie beams have the advantages of low cost, good durability, and simple maintenance during the operation period. When constructing a steel tube concrete arch bridge, the steel tube concrete arch bridge can be quickly constructed without support. There is no need to set up large temporary facilities such as supports, swivel facilities, cable cranes, floating cranes, etc., which can effectively reduce the project cost, reduce construction risks, shorten the construction period, and bring greater economic benefits to bridge construction.

[0058] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, modified, rearranged, decomposed, combined, or deleted.

[0059] The specific implementation methods of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A construction method for a steel tube concrete arch bridge, characterized in that: The following steps are involved: Assemble the longitudinal frame, install the main arch, wind bracing, and temporary beams to form a rigid frame system; Installing a guide beam and a temporary buttress at one end of the rigid skeleton system; Pushing the rigid skeleton system; Using the rigid skeleton system as support, pouring concrete for the arch foot and end beams; pouring concrete of the main arch and tie beam; Install the center beam, hanger and carriageway slab.

2. The construction method of a steel tube concrete arch bridge according to claim 1, characterized in that: The construction method also includes: Carry out bridge substructure construction and level the site around the bridge.

3. The construction method of a steel tube concrete arch bridge according to claim 1, characterized in that: The jacking and stiffening skeleton system includes: The rigid frame system is pushed along the extension direction of the guide beam until the temporary pier supports the rigid frame system, and the guide beam is removed.

4. The construction method of a steel tube concrete arch bridge according to claim 1, characterized in that: The concrete for pouring the arch foot and the end beam with the rigid skeleton system as support includes: Inserting the end cross beam steel bundle and pouring the end cross beam concrete outside the end cross beam steel bundle; tensioning the end beam steel strands; The end cross beam steel strand is anchored on the end cross beam concrete.

5. The construction method of a steel tube concrete arch bridge according to claim 1, characterized in that: The pouring of concrete for the main arch and tie beam includes: Symmetrically installing the steel pipes of the main arch; sequentially pouring concrete in the lower steel pipe and concrete in the upper steel pipe to form the main arch; Installing a tie beam formwork on each of the longitudinal frames; The tie beam concrete is poured in the tie beam formwork.

6. The construction method of a steel tube concrete arch bridge according to claim 1, characterized in that: The installation includes beams, hangers and roadway slabs: Installing a middle cross beam between the main arch concrete and the tie beam concrete; pouring wet joint concrete at the connection between the middle cross beam and the tie beam concrete; A prestressed bundle is arranged in the middle cross beam, and the prestressed bundle is tensioned.

7. The construction method of a steel tube concrete arch bridge according to claim 1, characterized in that: The installation includes beams, hangers and roadway slabs: After the installation of the suspension rod is completed, the suspension rod is tensioned for the first time; pouring bridge deck concrete on the carriageway slab; When the bridge deck concrete reaches a preset strength, the hanger is tensioned for a second time.

8. A steel tube concrete arch bridge, characterized in that: The construction method of a steel tube concrete arch bridge according to any one of claims 1 to 7 comprises: Bridge substructure support; A bridge superstructure is arranged on the bridge lower support structure, the bridge superstructure comprises a tie rod, a middle cross beam, an end cross beam and a rigid skeleton system, the middle cross beam connects two tie rods arranged oppositely, the rigid skeleton system is arranged inside the tie rod, and the end cross beam connects two main arches arranged oppositely in the rigid skeleton system; Among them, the rigid frame system also includes a longitudinal frame, a temporary crossbeam, a wind brace, and an outer steel pipe of the hanger. The longitudinal frame is parallel to the extension direction of the tie rod. The temporary crossbeam connects the two relatively arranged longitudinal frames. The wind brace is connected to the main arch. The two ends of the outer steel pipe of the hanger are respectively connected to the main arch and the longitudinal frame.

9. The steel tube concrete arch bridge according to claim 8, characterized in that: It also includes angle steels, connecting steel plates, stiffening steel plates and diagonal braces, wherein the angle steels are arranged at the four corners of the longitudinal frame, the connecting steel plates connect adjacent angle steels horizontally or vertically, the stiffening steel plates are vertically connected to the axis of the longitudinal frame, and the diagonal braces are arranged on the stiffening steel plates.

10. The steel tube concrete arch bridge according to claim 8, characterized in that: The main arch includes an upper steel pipe, a lower steel pipe and a steel web. The lower steel pipe is stacked with the upper steel pipe. Both ends of the steel web are connected to the lower steel pipe and the upper steel pipe respectively. The upper steel pipe and the lower steel pipe are filled with concrete.

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