Fabricated steel structure arch bridge and construction method thereof

Abstract

The invention discloses a fabricated steel structure arch bridge and a construction method thereof. The fabricated steel structure arch bridge comprises a support and back walls which are arranged at the position of a bridge abutment, longitudinal beams are erected between the back walls, a panel is laid on the longitudinal beams, and the panel is connected with an existing road and can pass through the arch bridge from the position above the panel; the structure is characterized in that the structure further comprises a steel pipe arch supported below the longitudinal beams, and the steel pipe arch comprises a steel pipe arch hoisting section and a steel pipe arch pre-buried section; the steel pipe arch pre-buried sections are located at the two ends of the steel pipe arch, pre-buried in the support and integrally formed with the support in a pouring mode, and the steel pipe arch hoisting section is integrally arranged and erected between the steel pipe arch pre-buried sections. By means of the steel pipe arches and the longitudinal beams which are integrally hoisted, it is avoided that supports are arranged in the middle of the bridge, the bridge is more reasonable in structural arrangement, and the overall structural strength and stability are higher.

Description

Technical Field

[0001] The present invention relates to the technical field of steel arch bridges, and particularly relates to a prefabricated steel structure arch bridge and a construction method thereof. Background Art

[0002] As an efficient and environmentally friendly bridge construction technology, steel structure arch bridges are receiving increasing attention, and the market scale also shows a high growth trend. Among them, the prefabricated steel structure arch bridge technology has been widely used at home and abroad due to its advantages such as rapid construction, controllable quality, energy conservation and environmental protection. The existing prefabricated steel structure arch bridges are prefabricated in multiple sections from one end of the bridge to the other end. First, temporary supports are set up, and the components are hoisted in sections onto the temporary supports, and then welded and assembled.

[0003] However, due to the large number of connection nodes of steel structure bridges, this installation method has low efficiency and a long wet operation time. Therefore, under long-term high-altitude operations, the construction quality is difficult to control. Moreover, the existing steel structure arch bridges are difficult to construct under the condition of high buried depth. The high buried depth of the bridge refers to the large vertical distance from the bottom surface of the bridge foundation to the designed ground (for land bridges) or the general scour line (for river-crossing bridges). For river-crossing bridges, support brackets need to be set under the bridge to ensure the normal connection of each component. Therefore, it is necessary to pump water, block the river, etc., and it is difficult to adapt to special situations such as high fill and soft foundation.

[0004] Therefore, there is an urgent need for a prefabricated steel structure arch bridge with high strength and more suitable for high buried depth. Summary of the Invention

[0005] This application aims to solve the problems in the prior art that when constructing a prefabricated steel arch bridge, it is necessary to pump water and block the river, which affects the environment; the construction is difficult and the construction quality is difficult to control under the condition of high buried depth, resulting in limited structural strength. The present invention uses an integrated steel pipe arch, installs the steel pipe arch under the longitudinal beam, and connects it to the support through the embedded part of the steel pipe arch. The construction is convenient, the connection strength is high, the quality of the prefabricated steel pipe arch is easy to guarantee, and the construction efficiency is higher.

[0006] To achieve the above object, in the first aspect, the present invention provides a prefabricated steel structure arch bridge, including: supports and breast walls arranged at the abutment positions, longitudinal beams are erected between the breast walls, a panel is laid on the longitudinal beams, the panel is connected to the existing road, and the arch bridge can be passed through from above the panel;

[0007] It further includes a steel pipe arch supporting the longitudinal beam, the steel pipe arch is arranged between the supports and below the longitudinal beam, and the longitudinal beam is supported by steel columns;

[0008] The steel pipe arch includes a hoisting section of the steel pipe arch and a pre-embedded section of the steel pipe arch. The pre-embedded section of the steel pipe arch is located at both ends of the steel pipe arch and is pre-embedded inside the support, and is integrally cast with the support. The hoisting section of the steel pipe arch is integrally arranged and is erected between the pre-embedded sections of the steel pipe arch.

[0009] In this application, the steel pipe arch with integrated hoisting avoids setting supports at the lower part of the bridge, does not require blocking the river under the bridge, avoids damage to the environment, and has higher construction efficiency. On the other hand, the present invention makes a unique connection structure for the integrated steel pipe arch. The installation of the steel pipe arch is realized through the connection of the pre-embedded section and the hoisting section. Through the combination of each structure, the structural setting of the bridge is more reasonable, and the overall structural strength and stability are higher.

[0010] In some embodiments, the pre-embedded section of the steel pipe arch is fixedly connected to the hoisting section of the steel pipe arch through a steel plate;

[0011] The steel plate includes a pre-embedded steel plate arranged on the pre-embedded part of the steel pipe arch and a connecting steel plate fixedly arranged at the end of the hoisting section of the steel pipe arch;

[0012] Stiffening plates are also arranged at the connection positions between the steel plate and the steel pipe arch.

[0013] The setting of the pre-embedded section of the steel pipe arch enhances the load-bearing capacity of the overall bridge. After the pre-embedding construction of the pre-embedded section of the steel pipe arch is completed, the hoisting section of the steel pipe arch is hoisted by a crane between the two pre-embedded sections of the steel pipe arch, and the pre-embedded section of the steel pipe arch is connected to the hoisting section of the steel pipe arch through the connecting steel plate and the stiffening plate, and the connection is more convenient. The connecting steel plate and the pre-embedded steel plate can be connected by bolts or welding, and the connection is more convenient and efficient.

[0014] In some embodiments, the pre-embedded section of the steel pipe arch is a hollow cylinder, the rear end of which extends into the support, and the front end is connected to the hoisting section of the steel pipe arch; a bottom pre-embedded steel plate is arranged at the rear end of the pre-embedded section of the steel pipe arch, and a bearing steel bar mesh is arranged behind the bottom pre-embedded steel plate;

[0015] Stiffening plates are also arranged between the bottom pre-embedded steel plate and the pre-embedded section of the steel pipe arch.

[0016] With such a setting, through the bearing steel bar mesh, the force of the steel pipe arch is dispersed and evenly distributed on the bearing steel bar mesh, and then the bearing steel bar mesh is integrally formed with the support, and the force of the steel pipe arch is dispersed to the entire support, which can improve the load-bearing capacity of the steel pipe arch.

[0017] In some embodiments, a steel tie beam is arranged between the two steel pipe arches; a diaphragm is arranged between the two longitudinal beams. The diaphragm is vertically arranged and provides vertical support for the longitudinal beams.

[0018] With such a setting, the two steel pipe arches are connected by the rigid tie beam, and the two longitudinal beams are connected by the diaphragm, which improves the overall stability. In addition, the diaphragms of the vertical supports provide more vertical support force for the entire panel.

[0019] In some embodiments, a rubber gasket is provided between the back wall and the longitudinal beam to provide elastic support for the longitudinal beam and reduce the impact of external forces such as earthquakes on the bridge.

[0020] In some embodiments, shear reinforcement bars are provided between the panel and the longitudinal beam.

[0021] With such a setting, the shear force transmission between the two can be ensured, and the stability of the panel can be maintained.

[0022] In some embodiments, internal stiffening ribs are arranged at intervals inside the steel pipe arch.

[0023] With such a setting, the load-bearing capacity of the steel pipe arch is improved.

[0024] In a second aspect, the present invention provides a construction method for the prefabricated steel structure arch bridge as described above, and the construction steps include:

[0025] S1: Install the bearing and the back wall at the abutment position;

[0026] S2: Lift the steel pipe arch to the space between the bearings by a crane to complete the installation of the steel pipe arch;

[0027] S3: Install the longitudinal beam by a crane and set steel columns between the longitudinal beam and the steel pipe arch;

[0028] S4: Set a steel tie beam between the two steel pipe arches and set diaphragms between the two longitudinal beams;

[0029] S5: Lay the panel above the diaphragm to complete the construction of the bridge.

[0030] Generally speaking, compared with the prior art, the beneficial effects of the present invention are as follows: Through the unique structural setting, the overall structural strength of the bridge is high. The steel pipe arch has only one span and is integrally arranged, and only one hoisting is required, so the construction efficiency is higher, and it is more suitable for bridges with high buried depth.

[0031] Other features and corresponding beneficial effects of the present application are described and explained in the later part of the specification, and it should be understood that at least some of the beneficial effects are obvious from the records in the specification of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention, its features, shape, and advantages will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. The same reference numerals indicate the same parts throughout all the drawings. The drawings are not necessarily drawn to scale, and the emphasis is on showing the gist of the present invention.

[0033] Figure 1 Front view of a prefabricated steel structure arch bridge according to an embodiment of the present invention;

[0034] Figure 2 Cross-sectional view of the connection structure between the support and a single steel pipe arch of a prefabricated steel structure arch bridge according to an embodiment of the present invention;

[0035] Figure 3 For Figure 2 Cross-sectional view at A-A in

[0036] Figure 4 Front view of the left half-span longitudinal beam of a prefabricated steel structure arch bridge according to an embodiment of the present invention;

[0037] Figure 5 Bottom view of the left half-span longitudinal beam of a prefabricated steel structure arch bridge according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the drawings:

[0039] 1. Support; 2. Back wall; 21. Rubber gasket; 3. Steel pipe arch; 31. Embedded section of steel pipe arch; 32. Lifting section of steel pipe arch; 33. Steel column; 4. Longitudinal beam; 5. Panel; 6. Steel tie beam; 7. Diaphragm; 8. Steel plate; 81. Embedded steel plate; 82. Connecting steel plate; 91. Bottom embedded steel plate; 92. Compressive steel bar mesh; 10. Stiffening plate. Specific implementation manners

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "front", "rear", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. The connections described in the present invention can be fixed connections, detachable connections, or integrally connected; they can be mechanical connections; they can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] To make the purpose, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the drawings.

[0043] Embodiment

[0044] See Figures 1 to 5 , this embodiment provides an assembled steel structure arch bridge, which includes a support 1 and a back wall 2 arranged at the abutment position. A longitudinal beam 4 is erected between the back walls 2, and a panel 5 is laid on the longitudinal beam 4. The panel 5 is connected to the existing road, and the arch bridge can pass above the panel 5; it also includes a steel pipe arch 3 supported below the longitudinal beam 4. The steel pipe arch 3 includes a steel pipe arch hoisting section 32 and a steel pipe arch embedded section 31; the steel pipe arch embedded section 31 is located at both ends of the steel pipe arch 3 and is embedded in the support 1, and is integrally cast with the support 1; the steel pipe arch hoisting section 32 is integrally arranged and is erected between the steel pipe arch embedded sections 31.

[0045] Among them, there are two steel pipe arches 3, arranged side by side between the supports 1, and there are also two longitudinal beams 4 arranged side by side between the back walls 2.

[0046] In the prior art, the main arch of an assembled steel arch bridge is generally assembled by multiple segments of arch ribs. The cable crane's lifting tool is used to hoist and transport each segment of the arch rib, and a cantilever anchor beam is set at the buckle point of the arch rib. This construction method has low efficiency and limited structural strength. The present application uses an integrated steel pipe arch 3, which has a higher load-bearing capacity, and its slope and size are easier to customize. The entire steel pipe arch 3 is prefabricated in the factory, reducing the installation interference on site, and the quality of the steel pipe arch 3 is higher.

[0047] Specifically, the steel pipe arch embedded section 31 and the steel pipe arch hoisting section 32 are fixedly connected by a steel plate 8; the steel plate 8 includes an embedded steel plate 81 arranged at the embedded part of the steel pipe arch 3 and a connecting steel plate 82 fixedly arranged at the end of the steel pipe arch hoisting section 32; in addition, in order to ensure the fixing strength of the steel plate 8, a stiffening plate is also provided at the connection position between the steel plate 8 and the steel pipe arch 3.

[0048] Specifically, the embedded section 31 of the steel pipe arch is embedded inside the support 1. The rear end extends into the support 1 and is integrally cast with the support 1. The front end faces the hoisting section of the steel pipe arch and is welded with an embedded steel plate 81 and a stiffening plate 10 to enhance the strength of the connection. In addition, the embedded section 31 of the steel pipe arch is a hollow cylinder, and a bottom embedded steel plate 91 is provided at the rear end of the embedded section of the steel pipe arch. The embedded section of the steel pipe arch is connected to the bottom embedded steel plate 91 through the stiffening plate 10. A bearing steel bar mesh 92 abuts against the rear of the bottom embedded steel plate 91. Its function is to disperse the force of the steel pipe arch 3 to the entire support 1 and improve the load-bearing capacity of the support 1 for the steel pipe arch 3.

[0049] Specifically, a vertical steel column 33 is provided between the steel pipe arch 3 and the longitudinal beam 4 for support; a steel tie beam 6 is horizontally welded between the two steel pipe arches 3; a diaphragm 7 is provided between the two longitudinal beams 4; specifically, the diaphragm 7 is made of steel and vertically supports between the two longitudinal beams 4. Pipe internal stiffeners (not shown in the figure) are arranged at intervals inside the steel pipe arch 3. Through these supports, the stability of the steel structure bridge is enhanced.

[0050] Specifically, the steel column 33 can be a circular pipe or an I-beam, and the steel tie beam 6 can be a circular pipe or an I-beam. The steel column 33 provided above the steel pipe arch 3 provides a vertical supporting force for the longitudinal beam 4, and the steel tie beam 6 horizontally connects the two steel pipe arches 3 to provide lateral support to ensure the overall stability of the bridge.

[0051] Specifically, a rubber gasket 21 is provided between the back wall 2 and the longitudinal beam 4, so that the back wall 2 can better support the entire longitudinal beam 4, provide elastic support for it, and reduce the impact of external forces such as earthquakes on the bridge.

[0052] Specifically, shear reinforcement bars (not shown in the figure) are provided between the panel 5 and the longitudinal beam 4. There is a tendency for relative shear deformation to occur between the panel and the longitudinal beam. The shear reinforcement bars can effectively transfer the load borne by the panel to the longitudinal beam, enable the two to work together, jointly bear the load of the bridge, improve the overall load-bearing capacity of the structure, and ensure the shear transfer between the two.

[0053] The construction method of the prefabricated steel structure arch bridge as above includes the following steps: S1: Install the support 1 and the back wall 2 at the abutment position; S2: Hoist the steel pipe arch 3 between the supports 1 by a crane to complete the installation of the steel pipe arch 3; S3: Install the longitudinal beam 4 by a crane and set the steel column 33 between the longitudinal beam 4 and the steel pipe arch 3; S4: Set the steel tie beam 6 between the two steel pipe arches 3 and set the diaphragm 7 between the two longitudinal beams 4; S5: Lay the panel 5 above the diaphragm 7 to complete the construction of the bridge.

[0054] Those skilled in the art should understand that those skilled in the art can implement variations in combination with the prior art and the above embodiments, which will not be elaborated here. Such variations do not affect the essence of the present invention and will not be elaborated here. The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into equivalent embodiments with equivalent changes, which do not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An assembled steel structure arch bridge, comprising a support (1) arranged at a bridge abutment and a back wall (2) arranged on the support (1), a longitudinal beam (4) being arranged between the back wall (2), a panel (5) being laid on the longitudinal beam (4), the panel (5) being connected to an existing road, and the arch bridge can be passed from above the panel (5); It is characterized in that It also includes a steel tube arch (3) supporting the longitudinal beam (4), wherein the steel tube arch (3) is arranged between the supports (1) and below the longitudinal beam (4), and supports the longitudinal beam (4) via a steel column (33); The steel tube arch (3) comprises a steel tube arch hoisting section and a steel tube arch embedded section. The steel tube arch embedded sections are located at both ends of the steel tube arch, embedded in the support (1), and integrally cast with the support (1); the steel tube arch hoisting section is integrally arranged and erected between the embedded steel tube arch embedded sections; There are two of each of the steel tube arches (3) and the longitudinal beams (4), which are arranged side by side.

2. The assembled steel structure arch bridge according to claim 1, characterized in that: The pre-buried steel tube arch section and the hoisting steel tube arch section are fixedly connected via a steel plate (8); The steel plate (8) comprises an embedded steel plate (81) arranged at the embedded portion of the steel tube arch and a connecting steel plate (82) fixedly arranged at the end of the steel tube arch hoisting section; A stiffening plate is also provided at the connection position between the steel plate (8) and the steel tube arch (3).

3. The assembled steel structure arch bridge according to claim 1, characterized in that: The embedded steel tube arch section is a hollow cylinder, the rear end of which extends into the support (1), and the front end is connected to the steel tube arch hoisting section; the rear end of the embedded steel tube arch (3) section is provided with a bottom embedded steel plate (91), and a pressure-bearing steel mesh (92) is provided behind the bottom embedded steel plate (91); A stiffening plate is also provided between the bottom embedded steel plate (91) and the embedded section of the steel tube arch (3).

4. The assembled steel structure arch bridge according to claim 1, characterized in that: A steel tie beam (6) is provided between the two steel tube arches (3); and a transverse partition plate (7) is provided between the two longitudinal beams (4).

5. The assembled steel structure arch bridge according to claim 4, characterized in that: The transverse partition (7) is arranged vertically to provide vertical support for the longitudinal beam (4).

6. The assembled steel structure arch bridge according to claim 1, characterized in that: A rubber gasket (21) is provided between the back wall (2) and the longitudinal beam (4).

7. The assembled steel structure arch bridge according to claim 1, characterized in that: Shear reinforcement is provided between the panel (5) and the longitudinal beam (4) to ensure shear force transmission between the two.

8. The assembled steel structure arch bridge according to claim 1, characterized in that: The steel tube arch (3) is provided with internal tube reinforcing ribs at intervals.

9. A method for constructing an assembled steel structure arch bridge, comprising constructing an assembled steel structure arch bridge according to any one of claims 1 to 8, characterized in that: The construction steps include: S1: installing the support (1) and the back wall (2) at the abutment position; S2: hoisting the steel tube arch (3) between the supports (1) by means of a crane, thereby completing the installation of the steel tube arch (3); S3: installing the longitudinal beam (4) by means of a crane, and arranging a steel column (33) between the longitudinal beam (4) and the steel tube arch (3); S4: Laying the panel (5) on top of the longitudinal beam (4) to complete the construction of the bridge.

10. A method for constructing an assembled steel structure arch bridge, comprising constructing the assembled steel structure arch bridge according to any one of claims 4 or 5, characterized in that: Before laying the panel (5), a steel tie beam (6) is arranged between the two steel tube arches (3), and a transverse partition (7) is arranged between the two longitudinal beams (4).

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