A main arch structure of a long-span steel tube concrete arch bridge and its construction method

Abstract

The present invention discloses a main arch structure and construction method for a long-span steel tube concrete arch bridge. The main arch structure includes a main chord, which includes an upper chord and a lower chord. A web member structure is connected between the upper and lower chords. The web member structure includes a first web member assembly and a second web member assembly. The first web member assembly is located in the arch foot section, and the second web member assembly is located in the arch body section. The first web member assembly includes a first diagonal web member and a first transverse web member connected to each other. The first diagonal web member and the first transverse web member form a triangular space with the corresponding main chord. A stiffening splicing plate is provided in the triangular space. The stiffening splicing plate is provided in the stiffening splicing plate. A stiffening plate matching the shape of the connecting hole is provided in the connecting hole. The second web member assembly has a triangular structure. The web member structure can improve the overall transverse out-of-plane stiffness of the steel tube concrete main arch, and can also improve the web member stability and shear stiffness, thereby ensuring the local and overall stability of the entire bridge.

Description

Technical Field

[0001] The present invention relates to the field of bridge engineering, in particular to a main arch structure of a large-span steel tube concrete arch bridge and a construction method thereof. Background Art

[0002] As the span of steel tube concrete arch bridges continues to increase, the width-to-span ratio of the main arch decreases, resulting in prominent problems with the lateral stability of the main arch. How to improve the stability of large-span steel tube concrete arch bridges has become one of the technical bottlenecks restricting the development of their span.

[0003] like Figure 1 As shown, the main arch of the arch bridge includes an arch foot section and an arch body section.

[0004] The maximum span of existing CFST arch bridges is 575m. To build a 700m span CFST arch bridge, the main arch's width-to-span ratio would be further reduced, leading to significant lateral stability issues for the main arch. The lateral out-of-plane stiffness of the main arch foot region significantly impacts the lateral stability of the entire bridge. Existing 500m-class CFST arch bridges typically utilize an "N-shaped" truss steel tube arrangement for the main arch webs. However, when spans reach 700m, this main arch web arrangement becomes difficult to meet the overall and local stability requirements for the entire bridge. Summary of the Invention

[0005] The purpose of the present invention is to provide a main arch structure and construction method for a long-span concrete-filled steel tube arch bridge, in response to the problems in the prior art that when the span of a concrete-filled steel tube arch bridge reaches 700m, the lateral stability of the main arch becomes prominent and the "N-type" arrangement of the main arch web bars using truss steel tubes is difficult to meet the requirements of the overall and local stability of the entire bridge.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A main arch structure of a long-span steel tube concrete arch bridge includes a main chord, wherein the main chord includes an upper chord and a lower chord, and a web member structure is connected between the upper chord and the lower chord. The web member structure includes a first web member assembly and a second web member assembly; the first web member assembly is located in the arch foot section, and the second web member assembly is located in the arch body section;

[0008] The first web member assembly includes a first diagonal web member and a first transverse web member connected to each other, the first diagonal web member and the first transverse web member forming a V-shaped structure, and enclosing a triangular space with the main chord member corresponding to the open side of the V-shaped structure, a stiffening splicing plate is provided in the triangular space, the stiffening splicing plate is connected to the corresponding first diagonal web member, the first transverse web member and the main chord member, a connecting hole is provided in the stiffening splicing plate, a stiffening plate adapted to the shape of the connecting hole is provided in the connecting hole, and a circle of the outer side of the stiffening plate is connected to the side wall of the connecting hole;

[0009] The second web member assembly is in a triangular structure.

[0010] The large span mentioned in the present invention refers to a steel tube concrete arch bridge with a main span greater than 700m.

[0011] A main arch structure of a long-span concrete-filled steel tube arch bridge. The structure significantly enhances the lateral out-of-plane stiffness of the arch foot region of the main arch and the lateral stability of the entire bridge. A first web member assembly is provided in the arch foot region of the main arch, and a stiffening splice plate and a stiffening plate are provided between adjacent first transverse web members and first diagonal web members to form a tube-plate composite structure. This structure enhances the overall lateral out-of-plane stiffness of the concrete-filled steel tube main arch, significantly improving the stability of the entire bridge.

[0012] At the same time, a second web member assembly with a triangular structure is set in the arch section to improve the stability and shear stiffness of the web member;

[0013] The web structure formed by the first web assembly and the second web assembly can improve the overall lateral out-of-plane stiffness of the steel tube concrete main arch, and can also improve the web stability and shear stiffness, ensuring the local and overall stability of the entire bridge and reducing construction difficulty and risks.

[0014] As a preferred solution of the present invention, the number of the first web member assemblies is at least two, and all of the first web member assemblies are arranged in the same direction along the length direction of the main chord.

[0015] As a preferred solution of the present invention, the number of the second web member assemblies is at least two, and all of the second web member assemblies are arranged in the same direction along the length direction of the main chord.

[0016] As a preferred embodiment of the present invention, the second web member assembly includes a second transverse web member and two second diagonal web members, and the second transverse web member and the two second diagonal web members form a triangular unit;

[0017] One end of the second transverse web is connected to the upper chord, and the other end of the second transverse web is connected to the lower chord;

[0018] One end of each second diagonal web member is connected to the corresponding main chord, and the other end is connected to the midpoint of the second transverse web member in the adjacent second web member assembly. This structure effectively reduces the free length of the web member, improving its compressive and shear stiffness, and ensuring the local stability of the compressed web member.

[0019] As a preferred solution of the present invention, the two second diagonal web members in the same second web member assembly have the same length.

[0020] As a preferred solution of the present invention, adjacent first transverse web members and the first diagonal web members therebetween jointly form an N-shaped structure.

[0021] As a preferred solution of the present invention, a T-shaped rigid frame is provided on the outer side of the main arch structure.

[0022] A construction method for a main arch structure of a long-span concrete-filled steel tube arch bridge is provided, which is used to construct the first web member assembly in the main arch structure of the long-span concrete-filled steel tube arch bridge, and comprises the following steps:

[0023] S1: Welding the first transverse web member and the first diagonal web member to the main arch segment in a factory to process and manufacture the steel tube concrete truss main arch segment;

[0024] S2: welding the stiffening splice plate to the corresponding first web member assembly in a factory;

[0025] S3: transporting the steel tube concrete truss main arch segment welded with the stiffening splicing plate to the construction site for overall hoisting and installation until the main arch is closed;

[0026] S4: Welding the stiffening plates to the corresponding stiffening splicing plates.

[0027] A construction method for the main arch structure of a large-span steel tube concrete arch bridge is disclosed. Through the above method, the stiffening plates are installed in two stages, which greatly reduces the hoisting weight and construction risks of the main arch segments, saves the scale and cost of the temporary hanging system, and can simultaneously meet the stability requirements of the entire bridge during the construction stage and the stability requirements of the completed bridge during the operation stage.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. A main arch structure of a long-span concrete-filled steel tube arch bridge. The structure significantly enhances the lateral out-of-plane stiffness of the main arch foot region on the lateral stability of the entire bridge. A first web member assembly is provided in the main arch foot region, and stiffening splicing plates and stiffening plates are provided between adjacent first transverse web members and first diagonal web members to form a tube-sheet composite structure. This structure enhances the overall lateral out-of-plane stiffness of the concrete-filled steel tube main arch, significantly improving the stability of the entire bridge.

[0030] At the same time, a second web member assembly with a triangular structure is set in the arch section to improve the stability and shear stiffness of the web member;

[0031] The web structure formed by the first web assembly and the second web assembly can improve the overall lateral out-of-plane stiffness of the steel tube concrete main arch, and can also improve the web stability and shear stiffness, ensuring the local and overall stability of the entire bridge and reducing construction difficulty and risks.

[0032] 2. A construction method for the main arch structure of a large-span steel tube concrete arch bridge. Through the above method, the stiffening plates are installed in two stages, which greatly reduces the lifting weight and construction risks of the main arch segments, saves the scale and cost of the temporary hanging system, and can simultaneously meet the stability requirements of the entire bridge during the construction stage and the stability requirements of the completed bridge during the operation stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the arch foot section and arch body section of the main arch structure in the prior art.

[0034] Figure 2 It is a structural schematic diagram of the main arch structure of a large-span steel tube concrete arch bridge described in the present invention.

[0035] Figure 3 It is a structural schematic diagram of the second web assembly described in the present invention.

[0036] Figure 4 It is a structural schematic diagram of the first web member assembly and the stiffening splicing plate described in the present invention being spliced ​​together.

[0037] Figure 5 It is a structural schematic diagram of the stiffening splicing plate and the stiffening plate spliced ​​together according to the present invention.

[0038] Figure 6 It is a structural schematic diagram of the T-shaped rigid frame of the present invention being arranged outside the main arch structure.

[0039] Icon: 1-main arch; 11-arch foot section; 12-arch body section; 2-first web member assembly; 21-first diagonal web member; 22-stiffening splicing plate; 221-connecting hole; 23-first transverse web member; 24-stiffening plate; 3-second web member assembly; 31-second transverse web member; 32-second diagonal web member; 4-upper chord; 5-lower chord; 6-T-shaped rigid frame. DETAILED DESCRIPTION

[0040] The present invention will be described in detail below with reference to the accompanying drawings.

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] Example 1

[0043] like Figures 1-6 As shown, this embodiment provides a main arch structure of a long-span steel tube concrete arch bridge, including a main chord, the main chord including an upper chord 4 and a lower chord 5, and a web structure is connected between the upper chord 4 and the lower chord 5;

[0044] The web member structure includes a first web member assembly 2 and a second web member assembly 3. The first web member assembly 2 is located at the arch foot section 11 of the main arch 1, and the second web member assembly 3 is located at the arch body section 12 of the main arch 1.

[0045] The number of the first web member assemblies 2 and the second web member assemblies 3 is at least two, at least two first web member assemblies 2 are arranged in the same direction along the length direction of the main chord, and at least two second web member assemblies 3 are arranged in the same direction along the length direction of the main chord;

[0046] The first web member assembly 2 includes a first transverse web member 23 and a first diagonal web member 21. The two ends of the first transverse web member 23 are welded to the upper chord 4 and the lower chord 5, respectively. One end of the first diagonal web member 21 is welded to the end of the first transverse web member 23, and the other end of the first diagonal web member 21 is welded to the corresponding main chord.

[0047] The first transverse web member 23 and the first diagonal web member 21 form a V-shaped structure. The first transverse web member 23, the first diagonal web member 21 and the main chord member corresponding to the opening side of the V-shaped structure form a triangular space. A stiffening splicing plate 22 is provided in the triangular space. The stiffening splicing plate 22 is welded to the corresponding first transverse web member 23, the first diagonal web member 21 and the main chord member.

[0048] The V-shaped structure in this application does not refer to a V-shaped structure in the strict sense in which both sides are the same length. As long as two long rods are connected at one end on the same side and there is an angle between the two long rods, they are all within the scope of protection of the V-shaped structure of this application;

[0049] A connection hole 221 is provided in the stiffening splicing plate 22, and a stiffening plate 24 having a shape matching that of the connection hole 221 is provided in the connection hole 221. The outer periphery of the stiffening plate 24 is welded to the side wall of the connection hole 221.

[0050] The adjacent first transverse web members 23 and the first diagonal web members 21 therebetween together form an N-shaped structure;

[0051] The second web member assembly 3 includes a second transverse web member 31 and two second diagonal web members 32. The second transverse web member 31 and the two second diagonal web members 32 form a triangular unit. The two ends of the second transverse web member 31 are respectively welded to the upper chord 4 and the lower chord 5. One end of the second diagonal web member 32 is welded to the main chord on the corresponding side. The other end of the second diagonal web member 32 is welded to the midpoint of the second transverse web member 31 in the adjacent second web member assembly 3.

[0052] The two second diagonal web members 32 in the same second web member assembly 3 have the same length.

[0053] A T-shaped rigid frame 6 is provided outside the main arch structure; specifically, the T-shaped rigid frame 6 adopts a prestressed reinforced concrete structure, the T-shaped rigid frame 6 outside the arch foot section 11 is supported on the abutment, and the T-shaped rigid frame 6 outside the arch body section 12 is supported on the arch column.

[0054] The cantilever length of the T-shaped rigid frame 6 effectively reduces the load on the main arch, and can avoid the need to set higher arch columns at the arch foot section 11 of the main arch 1, with a significant weight reduction effect. In addition, the construction of the T-shaped rigid frame 6 does not conflict with the construction of the steel tube concrete arch bridge, with little interference, a fast construction period, and reduced construction difficulty.

[0055] This embodiment also provides a construction method for a main arch structure of a long-span concrete-filled steel tube arch bridge, which is used to construct the first web member assembly 2 in the main arch structure of the long-span concrete-filled steel tube arch bridge, comprising the following steps:

[0056] S1: Welding the first transverse web member 23 and the first diagonal web member 21 to the main arch segment 1 in the factory, and processing and manufacturing the steel tube concrete truss main arch segment 1;

[0057] S2: Welding the stiffening splice plate 22 to the corresponding first web member assembly 2 in the factory;

[0058] S3: transporting the steel tube concrete truss main arch 1 segment welded with the stiffening splicing plate 22 to the construction site and hoisting and installing it as a whole until the main arch 1 is closed;

[0059] S4: Weld the stiffening plates 24 to the corresponding stiffening splicing plates 22 .

[0060] The beneficial effects of the main arch structure and construction method of a long-span steel tube concrete arch bridge provided in this embodiment are:

[0061] The transverse out-of-plane stiffness of the arch foot region of the main arch 1 significantly affects the lateral stability of the entire bridge. A first web member assembly 2 is provided in the arch foot 11 region of the main arch 1, and stiffening splicing plates 22 and stiffening plates 24 are provided between adjacent first transverse web members 23 and first diagonal web members 21 to form a tube-sheet composite structure. This is used to increase the overall transverse out-of-plane stiffness of the steel tube concrete main arch 1, significantly improving the stability of the entire bridge.

[0062] At the same time, a second web member assembly 3 with a triangular structure is provided in the arch section 12 to improve the web member stability and shear stiffness;

[0063] The web member structure formed by the first web member assembly 2 and the second web member assembly 3 can improve the overall transverse out-of-plane stiffness of the steel tube concrete main arch 1, and can also improve the web member stability and shear stiffness, thereby ensuring the local and overall stability of the entire bridge and reducing construction difficulty and risks.

[0064] The cantilever length of the T-shaped rigid frame 6 effectively reduces the load on the main arch, avoiding the need to install high arch columns at the arch foot section 11 of the main arch 1, resulting in a significant weight reduction effect. In addition, the construction of the T-shaped rigid frame 6 does not conflict with the construction of the steel tube concrete arch bridge, resulting in minimal interference, a shorter construction period, and reduced construction difficulty.

[0065] This construction method divides the installation of the stiffening plate 22 into two stages, greatly reducing the hoisting weight and construction risks of the main arch 1 segment, saving the scale and cost of the temporary hanging system, and being able to simultaneously meet the stability requirements of the entire bridge construction stage and the stability requirements of the bridge operation stage.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A main arch structure of a long-span steel tube concrete arch bridge, comprising a main chord, wherein the main chord comprises an upper chord (4) and a lower chord (5), and a web structure is connected between the upper chord (4) and the lower chord (5), characterized in that: The web member structure comprises a first web member assembly (2) and a second web member assembly (3); the first web member assembly (2) is located in the arch foot section (11), and the second web member assembly (3) is located in the arch body section (12); The first web member assembly includes a first diagonal web member (21) and a first transverse web member (23) connected to each other, the first diagonal web member (21) and the first transverse web member (23) forming a V-shaped structure, and forming a triangular space with the main chord member corresponding to the opening side of the V-shaped structure, a stiffening splicing plate (22) is provided in the triangular space, the stiffening splicing plate (22) is connected with the corresponding first diagonal web member (21), the first transverse web member (23) and the main chord member, a connecting hole (221) is provided in the stiffening splicing plate (22), a stiffening plate (24) having a shape adapted to the connecting hole (221) is provided in the connecting hole (221), and a circle of the outer side of the stiffening plate (24) is connected to the side wall of the connecting hole (221); The second web component (3) has a triangular structure; The number of the first web member assemblies (2) is at least two, and all the first web member assemblies (2) are arranged in the same direction along the length direction of the main chord; The number of the second web member assemblies (3) is at least two, and all the second web member assemblies (3) are arranged in the same direction along the length direction of the main chord; The second web member assembly (3) comprises a second transverse web member (31) and two second diagonal web members (32), wherein the second transverse web member (31) and the two second diagonal web members (32) form a triangular unit; One end of the second transverse web member (31) is connected to the upper chord member (4), and the other end of the second transverse web member (31) is connected to the lower chord member (5); One end of the second diagonal web member (32) is connected to the main chord member on the corresponding side, and the other end of the second diagonal web member (32) is connected to the midpoint of the second transverse web member (31) in the adjacent second web member assembly (3).

2. The main arch structure of a long-span steel tube concrete arch bridge according to claim 1, characterized in that: The two second diagonal web members (32) in the same second web member assembly (3) have the same length.

3. The main arch structure of a long-span steel tube concrete arch bridge according to claim 2, characterized in that: Adjacent first transverse web members (23) and the first diagonal web member (21) therebetween jointly form an N-shaped structure.

4. The main arch structure of a long-span steel tube concrete arch bridge according to claim 1, characterized in that: A T-shaped rigid frame (6) is provided on the outer side of the main arch structure.

5. A construction method for the main arch structure of a long-span steel tube concrete arch bridge, characterized in that: The method for constructing the first web member assembly (2) in the main arch structure of a long-span steel tube concrete arch bridge according to any one of claims 1 to 4 comprises the following steps: S1: Welding the first transverse web member (23) and the first diagonal web member (21) to the main arch (1) segment in a factory to manufacture the steel tube concrete truss main arch (1) segment; S2: welding the stiffening splice plate (22) to the corresponding first web member assembly (2) in a factory; S3: transporting the steel tube concrete truss main arch (1) segment welded with the stiffening splicing plate (22) to the construction site and hoisting and installing it as a whole until the main arch (1) is closed; S4: Welding the stiffening plate (24) to the corresponding stiffening splicing plate (22).

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