Three-section assembled windproof bridge and construction method

Abstract

The three-section assembled windproof bridge comprises a steel pipe lattice column, a truss longitudinal beam and a screen plate, the steel pipe lattice column is arranged on one side of an existing bridge pier body, the steel pipe lattice columns are arranged at intervals, the truss longitudinal beam is arranged between the steel pipe lattice columns, the screen plate comprises an upper windproof plate, a middle windproof plate and a lower windproof plate, the upper windproof plate, the middle windproof plate and the lower windproof plate are respectively arranged on the upper portion, the middle portion and the lower portion of the truss longitudinal beam, the upper windproof plate and the lower windproof plate are symmetrically arranged about the horizontal center line of the truss longitudinal beam, and the height of the upper windproof plate and the height of the lower windproof plate can be independently adjusted. The three-section assembled windproof bridge and the construction method solve the technical problems that the existing windproof facilities increase the load of the bridge, the torque of one side is too large, and the on-site construction seriously interferes with the operation, and have the comprehensive advantages of independent system, reasonable stress, fast assembly, convenient operation and maintenance, strong adaptability and the like.

Description

Technical Field

[0001] This invention relates to the field of windproof engineering technology for railway bridges, and more specifically, to a three-section prefabricated windproof bridge and its construction method. Background Technology

[0002] In areas with strong winds along railways, frequent strong winds can severely disrupt normal railway operations, causing problems such as speed restrictions on existing railways and train stoppages, resulting in decreased transportation efficiency and increased operating costs. Furthermore, existing windbreak facilities are often unable to meet the ever-increasing demands of railway operations.

[0003] Existing windproof technologies mainly have the following problems: First, there is the issue of structural dependence. If wind-resistant facilities are directly added to the existing railway bridge beams, the wind load will act directly on the main bridge structure, which may pose a potential threat to the safety of the main bridge structure, increase the bridge load, and affect the long-term durability of the structure.

[0004] Second, there is the problem of unreasonable stress distribution. Traditional windproof structures often adopt a single-sided arrangement. The wind load on one side causes the structure to bear a large torque. Excessive torque seriously affects the long-term safety and stability of the structure and is prone to fatigue damage.

[0005] Third, there is the problem of insufficient adaptability. The existing windbreak facilities have a fixed height, which makes it difficult to adapt to complex and ever-changing wind field environments. They cannot be precisely adjusted according to the wind protection needs of different wind speed areas along the route, resulting in insufficient reliability of the protective effect.

[0006] Fourth, the issue of construction interference. On-site construction of existing windproof facilities must be carried out close to the operating railway, which seriously interferes with the normal operation of the railway. The construction window is limited, making it difficult to achieve rapid and interference-free construction.

[0007] Therefore, there is an urgent need to develop an independent windproof structure that does not rely on existing bridges, is highly adaptable, and can be deployed quickly, in order to improve the wind resistance of railways in strong wind areas and ensure transportation safety and smooth operation. Summary of the Invention

[0008] This invention provides a three-section prefabricated windproof bridge, which addresses the technical problems of existing railway windproof structures in strong wind areas, such as dependence on bridges, unfavorable stress distribution, and significant construction interference. The invention provides a three-section prefabricated windproof bridge that separates the windproof function from the main bridge structure, optimizes the structural stress system, improves environmental adaptability, and reduces construction interference to railway operations.

[0009] According to one aspect of the present invention, a three-section prefabricated windproof bridge is provided, comprising steel pipe lattice columns, truss longitudinal beams, and screen panels installed on one side of an existing bridge pier. The steel pipe lattice columns are spaced apart along the extension direction of the bridge, and the truss longitudinal beams are erected between the steel pipe lattice columns. The screen panels include an upper windbreak panel, a middle windbreak panel, and a lower windbreak panel. The upper windbreak panel, the middle windbreak panel, and the lower windbreak panel are respectively installed on the upper, middle, and lower parts of the truss longitudinal beams. The upper windbreak panel and the lower windbreak panel are symmetrically arranged about the horizontal centerline of the truss longitudinal beams, and the heights of the upper windbreak panel and the lower windbreak panel are independently adjustable.

[0010] Based on the above scheme, preferably, the truss longitudinal beam includes a main chord and a channel steel web. The main chord includes a rectangular steel tube, an upper double-connected plate, and a lower double-connected plate. The four rectangular steel tubes are arranged in a rectangular pattern. The upper and lower surfaces of the top two rectangular steel tubes are connected by the upper double-connected plate, and the upper and lower surfaces of the bottom two rectangular steel tubes are connected by the lower double-connected plate. Two adjacent rectangular tubes in the height direction are connected by a connecting plate. The channel steel web is installed on the upper and lower rectangular steel tubes in the length direction of the main chord, and the adjacent channel steel webs are arranged in a triangular truss pattern.

[0011] Preferably, based on the above scheme, the middle wind deflector is installed on the web of the channel steel, the upper wind deflector is installed on the upper part of the main chord, and the lower wind deflector is installed on the lower part of the main chord.

[0012] Based on the above scheme, the preferred embodiment is that the steel pipe lattice column includes a lower column segment and an upper column segment. The bottom end of the lower column segment is connected to the pile foundation, and the lower column segment is filled with concrete. The upper column segment is connected to the lower column segment through a flange.

[0013] Based on the above scheme, preferably, the lower part of the upper column segment and the upper part of the lower column segment together form a longitudinal flexible zone.

[0014] Based on the above scheme, a preferred embodiment is provided whereby a horizontal strut is provided between the steel pipe lattice column and the existing bridge pier.

[0015] This invention also provides a construction method for a three-section prefabricated windproof bridge, comprising the following steps: S1: Weld the upper column segment of the steel pipe lattice column to the truss longitudinal beam into an integral module, and simultaneously prefabricate three symmetrical windbreak plate components; S2: Construct independent pile foundations on the windward side of existing bridge piers; S3: Hoist the lower column segment of the steel pipe lattice column into place, connect it to the pile foundation, and pour concrete into the lower column segment; S4: The integral module formed in hoisting step 1 is in place and connected to the lower column section through the flange. The lateral distance between the independent support system and the existing main beam is adjusted to meet the safety clearance requirements of railway facilities. S5: Based on the structural stress calculation results, install horizontal struts between the top of the existing bridge pier and the steel pipe lattice column; S6: Install an upper wind deflector, a middle wind deflector, and a lower wind deflector on the truss longitudinal beam, so that the upper wind deflector and the lower wind deflector are symmetrically arranged about the horizontal center line of the longitudinal beam, and independently adjust the height of the upper wind deflector and the lower wind deflector according to the design wind speed value of different wind speed sections along the line.

[0016] Based on the above scheme, the height of the upper and lower windbreaks is independently calculated and adjusted according to the design wind speed values ​​of different wind speed sections along the route, so that the total windbreak height matches the wind speed section.

[0017] The present invention provides a three-section prefabricated windproof bridge and its construction method, which solves the technical problems of existing windproof facilities that increase the load on the bridge, have excessive torque on one side, and seriously interfere with operation during on-site construction. It has comprehensive advantages such as independent system, reasonable stress distribution, quick assembly, convenient operation and maintenance, and strong adaptability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the transverse structure of a three-section prefabricated windproof bridge at its support point according to the present invention.

[0019] Figure 2 This is a schematic diagram of the longitudinal structure of a three-section prefabricated windproof bridge according to the present invention.

[0020] Figure 3 This is an exploded view of a three-section prefabricated windproof bridge according to the present invention.

[0021] Figure 4 This is a schematic diagram of the transverse structure of the three-section symmetrical windbreak plate of a three-section prefabricated windproof bridge according to the present invention.

[0022] Figure 5 This is a schematic diagram of the longitudinal structure of the three symmetrical windbreak panels of a three-section prefabricated windproof bridge according to the present invention.

[0023] Figure 6This is a schematic diagram of the transverse bridge structure at the mid-span of the three-segment symmetrical windbreak plate of the three-segment prefabricated windproof bridge of the present invention.

[0024] Figure 7 This is a schematic diagram of the transverse bridge structure at the mid-span of the three symmetrical windbreak panels of a three-section prefabricated windproof bridge according to the present invention.

[0025] Figure 8 This is a schematic diagram of the transverse structure of the rectangular steel pipe truss longitudinal beam of a three-section prefabricated windproof bridge according to the present invention.

[0026] Figure 9 This is a schematic diagram of the longitudinal beam of the rectangular steel pipe truss of a three-section prefabricated windproof bridge according to the present invention.

[0027] Figure 10 This is a three-dimensional rendering of a three-section prefabricated windproof bridge according to the present invention. Figure 1 .

[0028] Figure 11 This is a three-dimensional rendering of a three-section prefabricated windproof bridge according to the present invention. Figure 2 .

[0029] Explanation of icon numbers: 1. Steel pipe lattice column; 1a. Upper column segment; 1b. Lower column segment; 2. Truss longitudinal beams; 21. Main chord; 211. Rectangular steel pipe; 22. Channel steel web; 23. Upper double gusset plate; 24. Lower double gusset plate; 3. Pile foundation; 4. Flange; 6. Existing bridge piers; 7. Horizontal struts; 8. Existing main beams; 9. Install the upper windshield; 10. Center windshield; 11. Lower windshield; 12. Maintenance access; 13. Existing windbreak facilities. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0032] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0033] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of the invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0035] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0037] Please see Figure 1 and combined Figure 2 , Figure 3 and Figure 4 As shown, a three-section prefabricated windproof bridge includes steel pipe lattice columns 1, truss longitudinal beams 2, and screen panels. The steel pipe lattice columns 1 are spaced apart along the bridge's extension direction. The truss longitudinal beams 2 are erected between the steel pipe lattice columns 1 to form an independent support system, located on the windward side of the existing bridge piers, separate from the existing main bridge structure. In specific implementation, the lateral distance between the independent support system and the existing main beams 8 is adjustable, achieving optimal windproof shielding while meeting the safety clearance requirements of railway facilities (e.g., ...). Figures 1-3 (As shown).

[0038] like Figure 1The diagram shown is a schematic diagram of the transverse structure of a three-section prefabricated windproof bridge support point according to the present invention. It shows the arrangement of the independent support system on the windward side of the pier, the relative positional relationship between the steel pipe lattice column 1 and the existing pier 6, and the connection structure of the horizontal strut 7.

[0039] like Figure 2 The diagram shown is a schematic diagram of the longitudinal structure of a three-section prefabricated windproof bridge according to the present invention, illustrating the continuous arrangement along the longitudinal direction of the line, the spacing of the steel pipe lattice columns 1, and the span connection relationship of the truss longitudinal beams 2.

[0040] like Figure 3 The diagram shown is an exploded view of a three-section prefabricated windproof bridge according to the present invention, clearly showing the disassembled state of each major component, including the flange connection node between the upper column section 1a and the lower column section 1b of the steel pipe lattice column 1, the welded integral module between the truss longitudinal beam 2 and the upper column section 1a, and the installation position relationship of the three windbreak plates.

[0041] The screen panel of the present invention includes an upper windbreak panel 9, a middle windbreak panel 10, and a lower windbreak panel 11; the upper windbreak panel 9, the middle windbreak panel 10, and the lower windbreak panel 11 are respectively installed on the upper, middle, and lower parts of the truss longitudinal beam 2; the upper windbreak panel 9 and the lower windbreak panel 11 are symmetrically arranged about the horizontal centerline of the truss longitudinal beam 2, and the heights of the upper windbreak panel 9 and the lower windbreak panel 11 can be independently adjusted, effectively adapting to the actual needs of different wind speed sections, such as... Figures 4-5 As shown, it can be implemented in phases.

[0042] like Figure 4 The diagram shows a transverse structural diagram of a three-section symmetrical windbreak plate of a three-section prefabricated windproof bridge according to the present invention. It shows the transverse arrangement of the upper windbreak plate 9, the middle windbreak plate 10 and the lower windbreak plate 11, as well as the structural features of the upper windbreak plate 9 and the lower windbreak plate 11 being symmetrically arranged about the horizontal centerline of the truss longitudinal beam 2.

[0043] like Figure 5 The diagram shown is a longitudinal structural diagram of the three symmetrical windbreak panels of a three-section prefabricated windproof bridge according to the present invention. It illustrates the continuous arrangement of the three windbreak panels along the longitudinal direction and the overlapping relationship between the windbreak panels.

[0044] The three-section symmetrical windbreak can be implemented in phases: initially, utilizing the existing windbreak facilities 13 on the bridge, only installing the upper windbreak 9 and the middle windbreak 10 (e.g., ...). Figure 6 (As shown); the lower windshield 11 will be installed and the old panel will be removed simultaneously after an evaluation of its operation over a certain number of years (as shown). Figure 7 As shown in the figure, this balances initial benefits with long-term functional integrity.

[0045] like Figure 6The diagram shown is a schematic diagram of the transverse bridge structure at the mid-span of the three-section symmetrical windbreak plate of the three-section prefabricated windproof bridge of the present invention in the early stage. It shows the structural state in the early stage where only the upper windbreak plate 9 and the middle windbreak plate 10 are installed, and the existing windbreak facilities 13 of the bridge are retained.

[0046] like Figure 7 The diagram shown is a transverse structural diagram of the mid-span of the three-section symmetrical windbreak plate of the three-section prefabricated windproof bridge of the present invention, which shows the complete structural state after the installation of the lower windbreak plate 11 and the simultaneous removal of the existing windbreak facility 13 in the later implementation stage.

[0047] The rectangular steel tube truss longitudinal beam 2 of the present invention includes four main chord members 21 and channel steel web plates 22. The steel tube main chord members 21 and channel steel web plates 22 are horizontally connected to form a stable spatial force-bearing system, such as... Figures 8-9 As shown, the maintenance passage 12 is integrated with the truss longitudinal beam 2 to form a maintenance platform that is accessible along the entire line.

[0048] Specifically, the main chord 21 includes four rectangular steel pipes 211, an upper double-connecting plate 23, and a lower double-connecting plate 24. The four rectangular steel pipes 211 are arranged in a rectangular pattern. The adjacent rectangular steel pipes 211 at the top are connected by the upper double-connecting plate 23, and the adjacent rectangular steel pipes 211 at the bottom are connected by the lower double-connecting plate 24. The outer sides of the adjacent rectangular steel pipes 211 in the height direction are connected by a connecting plate. Among them, the channel steel web plate 22 is installed on the connecting plate of the upper and lower rectangular steel pipes 211 in the height direction of the two main chords 21, and the adjacent channel steel web plates 22 are arranged in a triangular truss manner.

[0049] like Figure 8 The diagram shows a schematic of the longitudinal beams of a rectangular steel pipe truss of a three-section prefabricated windproof bridge of the present invention, which are connected by upper double gusset plates 23. It clearly shows the rectangular arrangement of the four finished square steel pipe main chord members 21, the triangular truss arrangement of the triangular truss channel steel web members, and the horizontal connection relationship of the upper and lower double gusset plates 24.

[0050] like Figure 9 The diagram shown is a schematic diagram of the longitudinal structure of the rectangular steel pipe truss longitudinal beam 2 of a three-section prefabricated windproof bridge according to the present invention. It shows the standard segment division of the longitudinal beam along the longitudinal direction, the alternating arrangement of the web members and the horizontal bracing, and the installation correspondence between the windbreak plate and each component of the longitudinal beam.

[0051] like Figure 10 and Figure 11 The images shown are three-dimensional renderings of a three-section prefabricated windproof bridge according to the present invention. Figure 1 and three Dimensional effect Figure 2It showcases the spatial form of the overall structure, the relative positions of the components, and the harmonious arrangement with the existing bridge from different perspectives.

[0052] It should be noted that the middle wind deflector 10 of the present invention is installed on the web plate 22 of the channel steel, the upper wind deflector 9 is installed on the upper part of the main chord 21, and the lower wind deflector 11 is installed on the lower part of the main chord 21.

[0053] The steel pipe lattice column 1 of the present invention adopts a segmented design, including a lower column segment 1b and an upper column segment 1a; the lower column segment 1b can be filled with concrete according to the bearing capacity requirements to enhance the overall performance, and the top areas of the upper column segment 1a and the lower column segment 1b together constitute a longitudinal flexible zone. By reasonably reducing the longitudinal connecting members in this zone, temperature deformation is effectively released and the constraint internal force is reduced.

[0054] The upper part of the upper column segment 1a has been welded to the rectangular steel pipe truss longitudinal beam 2 as an integral module in the factory. On the construction site, it is connected to the lower column segment 1b through flange 4, realizing fully assembled and rapid construction. The steel pipe lattice column 1 can also add horizontal struts 7 on the top of the existing pier 6 according to the actual stress requirements to improve the structural stress.

[0055] This invention presents a three-section prefabricated windproof bridge. Through system innovation and stress reconstruction, it significantly improves the windproof safety and structural reliability of railway facilities in strong wind areas. It effectively solves a series of problems associated with existing windproof structures, such as dependence on existing bridges, increased load on the main structure, unilateral torsion, and severe operational disruptions during construction. The bridge boasts comprehensive advantages including independent system, rational stress distribution, rapid assembly, convenient maintenance, and strong adaptability, providing reliable protection for railway operational safety and efficiency in strong wind environments. To further illustrate the solution of the present invention, a detailed description will be provided with specific embodiments. Embodiment 1 of the present invention: application of early-stage windproof reinforcement. like Figure 1 The diagram shows a schematic representation of the transverse structure of a three-section prefabricated windproof bridge support according to the present invention. The diagram illustrates the arrangement of the independent support system on the windward side of the pier: steel pipe lattice columns 1 are arranged on the windward side of the existing pier 6, with sufficient distance between the column centerline and the existing pier 6 centerline to avoid interfering with the existing railway; horizontal struts 7 are provided between the steel pipe lattice columns 1 and the existing pier 6; the transverse distance between the independent support system and the existing main beam 8 meets the safety clearance requirements of the railway facilities while achieving optimal windproof shielding.

[0056] like Figure 2 The diagram shows a longitudinal structural schematic of a three-section prefabricated windproof bridge according to the present invention. The diagram illustrates the continuous arrangement along the longitudinal direction of the bridge: the steel pipe lattice columns 1 correspond one-to-one with the piers of the existing bridge; the truss longitudinal beams 2 are erected between adjacent steel pipe lattice columns 1; forming a continuous windproof barrier along the longitudinal direction.

[0057] like Figure 3 The figure shows an exploded view of a three-section prefabricated windproof bridge according to the present invention. The figure clearly shows the disassembled state of each main component: the steel pipe lattice column 1 is composed of a lower column section 1b and an upper column section 1a. The upper end of the upper column section 1a has been welded to the truss longitudinal beam 2 as an integral module in the factory. The bottom end of the lower column section 1b is connected to the pile foundation 3. The upper column section 1a is connected to the lower column section 1b through a flange 4. The three windbreak plates (upper windbreak plate 9, middle windbreak plate 10, and lower windbreak plate 11) are installed as independent components on the truss longitudinal beam 2. The maintenance passage 12 is integrated with the truss longitudinal beam 2.

[0058] The steel pipe lattice column 1 adopts a four-limb lattice column form, with the column limbs being rectangular steel pipes, which are welded together by connecting plates. Channel steel web plates 22 are installed between the upper and lower rectangular steel pipes along the length of the column limb, arranged in a triangular truss pattern. Upper double-lacing plates 23 and lower double-lacing plates 24 are welded to the upper and lower parts of the column limb, respectively, forming a stable spatial lattice system.

[0059] The lower column segment 1b of the present invention is connected to the pile foundation 3, and concrete is poured into the lower column segment 1b to enhance the compressive bearing capacity of the column.

[0060] The upper column segment 1a is connected to the lower column segment 1b via flange 4. The lower part of the upper column segment 1a and the upper part of the lower column segment 1b together form a longitudinal flexible zone. By eliminating the transverse connecting members in this zone, temperature deformation is effectively released and the internal constraint forces are reduced.

[0061] The upper end of the upper column segment 1a has been welded to the truss longitudinal beam 2 as an integral module in the factory.

[0062] like Figure 6 The diagram shows a schematic representation of the transverse bridge structure at the mid-span of the three-segment symmetrical windbreak panels of a three-segment prefabricated windproof bridge according to the present invention. The diagram illustrates the initial implementation phase, where only the upper windbreak panel 9 and the middle windbreak panel 10 are installed, while the existing windbreak facility 13 of the bridge is retained. The existing windbreak facility 13 is the original windbreak panel attached to the bridge. The upper windbreak panel 9 has a height of H1, and the middle windbreak panel 10 has a height of H3. The two panels, when combined, form a comprehensive windproof system that can meet the basic windproof requirements of initial operation.

[0063] like Figure 8The diagram shows a schematic representation of the transverse structure of the rectangular steel pipe truss longitudinal beam 2 of a three-section prefabricated windproof bridge according to the present invention. The diagram clearly shows the rectangular arrangement of the four prefabricated square steel pipe main chord members 21: the main chord members 21 are prefabricated square steel pipes arranged in a rectangular pattern; adjacent main chord members 21 are connected by connecting plates; triangular truss-type channel steel web members are installed between the upper and lower main chord members 21 along their length, with adjacent channel steel web members arranged in a triangular truss pattern; the upper and lower double-lacing plates 24 are made of steel plates and welded to the upper and lower parts of the main chord members 21 respectively, forming a stable spatial force-bearing system.

[0064] like Figure 9 The figure shows a schematic diagram of the longitudinal structure of the rectangular steel pipe truss longitudinal beam 2 of a three-section prefabricated windproof bridge according to the present invention. The figure shows the standard segment division of the longitudinal beam along the longitudinal direction: the web members and the horizontal bracing are arranged alternately; the installation correspondence between the wind deflector and each component of the longitudinal beam is clearly visible, with the upper wind deflector 9 corresponding to the position of the upper chord, the middle wind deflector 10 corresponding to the position of the channel steel web 22, and the lower wind deflector 11 corresponding to the position of the lower chord.

[0065] like Figure 10 and Figure 11 The images shown are three-dimensional renderings of a three-section prefabricated windproof bridge according to the present invention. Figure 1 and three Dimensional effect Figure 2 It showcases the spatial form of the overall structure, the relative positions of the components, and the harmonious arrangement with the existing bridge from different perspectives.

[0066] One end of the horizontal strut 7 of the present invention is welded to the middle of the steel pipe lattice column 1, and the other end is connected to the top of the existing bridge pier 6 through a pre-embedded part, so as to improve the structural stress and reduce the horizontal displacement of the column top.

[0067] like Figure 4 The figure shows a schematic diagram of the transverse structure of the three-section symmetrical windbreaks of a three-section prefabricated windproof bridge according to the present invention. The figure shows the transverse arrangement of the upper windbreak 9, the middle windbreak 10, and the lower windbreak 11: the upper windbreak 9 is installed at the upper chord of the truss longitudinal beam 2, the middle windbreak 10 is installed on the channel steel web 22 of the truss longitudinal beam 2, and the lower windbreak 11 is installed at the lower chord of the truss longitudinal beam 2; the upper windbreak 9 and the lower windbreak 11 are arranged strictly symmetrically about the horizontal centerline of the truss longitudinal beam 2.

[0068] like Figure 5 The diagram shows a longitudinal structural schematic of the three symmetrical windbreak sections of a three-section prefabricated windproof bridge according to the present invention. The diagram illustrates the continuous arrangement of the three windbreak sections along the longitudinal direction: the windbreak sections are arranged continuously to ensure wind protection continuity; the windbreak sections are made of corrugated steel plates and are connected to the truss longitudinal beams 2 by self-tapping screws.

[0069] In this embodiment, in accordance with the previous windproof reinforcement requirements, the height H1 of the upper windbreak 9, the height H2 of the lower windbreak 11, the height H3 of the middle windbreak 10, and the total windproof height H are all set according to the current windproof requirements.

[0070] The height H1 of the upper wind deflector 9 and the height H2 of the lower wind deflector 11 can be adjusted independently.

[0071] The maintenance access road 12 is integrated with the truss longitudinal beam 2. The maintenance access road 12 is welded to the lower chord of the truss longitudinal beam 2 via angle steel brackets, forming a maintenance platform that is accessible along the entire line.

[0072] The construction method in this embodiment includes the following steps: S1: Factory prefabrication. The upper column segment 1a of the steel pipe lattice column 1 is welded to the truss longitudinal beam 2 to form an integral module. The three-section symmetrical windbreak panel structure is prefabricated simultaneously.

[0073] S2: Foundation construction. Construct independent pile foundation 3 on the windward side of the existing pier 6.

[0074] S3: Installation of lower column segment 1b. The lower column segment 1b of the steel pipe lattice column 1 is hoisted into place, connected to the pile foundation 3, and concrete is poured into the lower column segment 1b.

[0075] S4: Installation of the integral module. The prefabricated integral module from S1 is hoisted into place and connected to the lower column segment 1b via flange 4. The lateral distance L between the steel pipe lattice column 1 and the existing main beam 8 is adjusted to meet the safety clearance requirements of railway facilities.

[0076] S5: Installation of horizontal strut 7. Based on the structural stress calculation results, horizontal strut 7 is installed between the top of the existing pier 6 and the steel pipe lattice column 1. One end of the horizontal strut 7 is welded to the column body, and the other end is welded to the pre-embedded steel plate at the top of the existing pier 6.

[0077] S6: Wind deflector installation. Install the upper wind deflector 9, middle wind deflector 10, and lower wind deflector 11 on the truss longitudinal beam 2. Ensure the upper wind deflector 9 and lower wind deflector 11 are symmetrically arranged about the horizontal centerline of the longitudinal beam. Adjust the height H1 of the upper wind deflector 9 and the height H2 of the lower wind deflector 11 independently according to the design wind speed along the line, so that the total wind deflection height H matches the wind speed range.

[0078] S7: Installation of maintenance access 12. An integrated maintenance access 12 is installed through the truss longitudinal beam 2, including the laying of patterned steel plates and the installation of guardrails.

[0079] The above construction steps are carried out in stages during the railway operation window to minimize interference with railway operations.

[0080] Example 2: Application to Enhance Wind Protection Needs in Later Operations like Figure 7 The diagram shows a transverse structural diagram of the mid-span of a three-section prefabricated windproof bridge according to the present invention, illustrating the later implementation of the three-section symmetrical windbreak panels. The diagram shows the complete structural state after the installation of the lower windbreak panel 11 and the simultaneous removal of the existing windbreak facility 13 during the later implementation phase: the lower windbreak panel 11 has a height of H2, the three windbreak panels form a complete symmetrical arrangement, and the total windbreak height is increased; the existing windbreak facility 13 has been removed, avoiding airflow interference between the old and new facilities. During later installation, the previously installed maintenance passageway 12 is used for construction, eliminating the need for additional scaffolding and further reducing disruption to operations.

[0081] During operation, the existing windbreak facility 13 will be evaluated. If the existing windbreak facility 13 shows signs of rust, deformation, or reduced wind protection effectiveness, a replacement will be installed.

[0082] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A three-section prefabricated windproof bridge, characterized in that, The system includes steel pipe lattice columns, truss longitudinal beams, and screen panels installed on one side of the existing bridge pier. The steel pipe lattice columns are spaced apart along the extension direction of the bridge, and the truss longitudinal beams are erected between the steel pipe lattice columns. The screen panels include an upper windbreak panel, a middle windbreak panel, and a lower windbreak panel. The upper, middle, and lower windbreak panels are respectively installed on the upper, middle, and lower parts of the truss longitudinal beams. The upper and lower windbreak panels are symmetrically arranged about the horizontal centerline of the truss longitudinal beams, and the heights of the upper and lower windbreak panels are independently adjustable.

2. The three-section prefabricated windproof bridge as described in claim 1, characterized in that, The truss longitudinal beam includes a main chord and a channel steel web. The main chord includes a rectangular steel tube, an upper double-connected plate, and a lower double-connected plate. The four rectangular steel tubes are arranged in a rectangular pattern. The upper and lower surfaces of the top two rectangular steel tubes are connected by the upper double-connected plate, and the upper and lower surfaces of the bottom two rectangular steel tubes are connected by the lower double-connected plate. Two adjacent rectangular tubes in the height direction are connected by a connecting plate. The channel steel web is installed on the upper and lower rectangular steel tubes in the length direction of the main chord, and adjacent channel steel webs are arranged in a triangular truss pattern.

3. A three-section prefabricated windproof bridge as described in claim 2, characterized in that, The middle wind deflector is installed on the web of the channel steel, the upper wind deflector is installed on the upper part of the main chord, and the lower wind deflector is installed on the lower part of the main chord.

4. A three-section prefabricated windproof bridge as described in claim 1, characterized in that, The steel pipe lattice column includes a lower column section and an upper column section. The bottom end of the lower column section is connected to the pile foundation, and the lower column section is filled with concrete. The upper column section is connected to the lower column section through a flange.

5. A three-section prefabricated windproof bridge as described in claim 4, characterized in that, The lower part of the upper column segment and the upper part of the lower column segment together form a longitudinal flexible zone.

6. A three-section prefabricated windproof bridge as described in claim 1, characterized in that, A horizontal strut is installed between the steel pipe lattice column and the existing bridge pier.

7. A construction method for a three-section prefabricated windproof bridge, characterized in that, Includes the following steps: S1: Weld the upper column segment of the steel pipe lattice column to the truss longitudinal beam into an integral module, and simultaneously prefabricate three symmetrical windbreak plate components; S2: Construct independent pile foundations on the windward side of existing bridge piers; S3: Hoist the lower column segment of the steel pipe lattice column into place, connect it to the pile foundation, and pour concrete into the lower column segment; S4: The integral module formed in hoisting step 1 is in place and connected to the lower column section through the flange. The lateral distance between the independent support system and the existing main beam is adjusted to meet the safety clearance requirements of railway facilities. S5: After hoisting into place, install horizontal struts between the top of the existing pier and the steel pipe lattice column according to the structural stress calculation results; S6: Install an upper wind deflector, a middle wind deflector, and a lower wind deflector on the truss longitudinal beam, so that the upper wind deflector and the lower wind deflector are symmetrically arranged about the horizontal center line of the longitudinal beam, and independently adjust the height of the upper wind deflector and the lower wind deflector according to the design wind speed value of different wind speed sections along the line.

8. A construction method for a three-section prefabricated windproof bridge as described in claim 7, characterized in that, In step S6, the heights of the upper and lower wind deflectors are independently calculated and adjusted according to the design wind speed values ​​of different wind speed sections along the route, so that the total wind deflection height matches the wind speed section.

Images