Large-span steel structure pedestrian bridge suspension structure

Abstract

The utility model discloses a large -span steel structure footbridge bridge beam suspension structure relates to footbridge steel structure technical field, including main arch, suspender and deck structure. Main arch is by two sides box -shaped section arch rib and welds in the arch top and 1 / 4 cross position multiple groups of cross link and constitutes integral force structure, and suspender is rigid member, and each group contains two parallel rod members, and is hinged through the column pin and the ear plate symmetrically welded in the arch rib lower web center line and the tie beam upper flange center line, realizes the flexible connection of main arch and deck structure. The deck structure contains the framework that is composed of parallelogram section tie beam, longitudinal beam and equal interval arrangement crossbeam, and the closed box is formed to the framework upper and lower cover top plate and bottom plate, and the both sides tie beam outside is equipped with the symmetric cantilever and forms the continuous overhanging structure with top and bottom plate. This structure utilizes suspender force transmission, makes arch end no horizontal thrust, has the advantages that arch bridge large -span and simply supported beam foundation adaptability is strong, promotes structural performance and landscape effect.

Description

Technical Field

[0001] This utility model relates to the field of pedestrian bridge steel structure technology, and more specifically to the suspension structure of a long-span steel pedestrian bridge. Background Technology

[0002] At busy urban intersections, constructing pedestrian overpasses is essential for separating pedestrians from vehicles, ensuring pedestrian safety, and facilitating smooth traffic flow. Traditional reinforced concrete pedestrian overpasses suffer from limitations such as monotonous design and long construction periods, making them unsuitable for the complex environments of modern urban roads with large spans and intricate underground structures. While steel structure pedestrian overpasses are gaining popularity due to their lightweight, high strength, and ease of construction, traditional simply supported beam steel structure overpasses have limited spans and insufficient aesthetic appeal. This invention, through an innovative suspended structure design, effectively solves the stress challenges and aesthetic requirements of large-span pedestrian overpasses, providing a new solution for urban multi-level transportation construction. Utility Model Content

[0003] The purpose of this invention is to address the limitations of traditional simply supported beam steel pedestrian bridges, which have simple designs and small spans, making them unsuitable for handling pedestrian traffic across modern urban roads. This invention provides a large-span steel structure pedestrian bridge suspension structure. By employing a tied-arch system, a horizontal thrust-free design is achieved, allowing the pier foundations to bear only vertical loads, significantly improving foundation adaptability. Simultaneously, through modular component design and aesthetically pleasing construction, both structural performance and urban landscape requirements are considered.

[0004] The technical solution adopted in this utility model is as follows: a suspension structure for a long-span steel pedestrian bridge, including a main arch, hangers, and a bridge deck structure; the main arch is composed of two arch ribs on both sides and horizontal welded joints connecting the arch ribs; the hangers are rigid components, with their upper ends hinged to the lower part of the arch ribs via ear plates, and their lower ends hinged to the upper part of the tie beams of the bridge deck structure via ear plates; the bridge deck structure includes: a skeleton composed of tie beams, longitudinal beams, and transverse beams, a top plate covering the skeleton above and a bottom plate below, and cantilevered sections on the outer side of the tie beams.

[0005] Preferably, the arch rib has a box-shaped cross-section.

[0006] Preferably, each group of the hangers includes two parallel rods, and each group of hangers corresponds to four ear plates, two of which are symmetrically welded to the lower part of the arch rib and the other two are symmetrically welded to the upper part of the tie beam. The two ends of the hangers are hinged to the ear plates by pins.

[0007] Preferably, the transverse bracing consists of multiple sets, which are welded to the arch ribs on both sides to form an integral load-bearing structure.

[0008] Preferably, the tie beam has a parallelogram cross-section.

[0009] Preferably, the longitudinal beams are arranged parallel to each other between the two tie beams, and the transverse beams are arranged at equal intervals along the short side of the bridge deck.

[0010] Preferably, the top plate and the bottom plate together form a closed bridge deck box structure.

[0011] Preferably, the cantilever is symmetrically arranged on both sides of the bridge deck and forms a continuous cantilever structure with the top plate and bottom plate.

[0012] Preferably, the transverse joint is segmented at the top of the arch rib and at the 1 / 4 span position.

[0013] Preferably, the ear plate is welded to the center line of the web of the arch rib box section and the center line of the upper flange of the tie beam.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0015] This utility model achieves a 50m span by uniformly transmitting force through 6 sets of suspension rods, meeting the pedestrian crossing needs of urban main roads and expressways, and has strong span adaptability.

[0016] The pier of this invention does not bear horizontal thrust, reduces foundation costs, is suitable for areas with complex geological conditions, and is foundation-friendly.

[0017] The circular arch ribs and continuous cantilever structure of this utility model form a smooth architectural outline, and the enclosed box bridge deck provides a flat and transparent walking space, which has both functional and aesthetic value and enhances the viewing value.

[0018] This utility model features prefabricated all-steel structure production and rapid on-site installation of hinged joints, shortening the construction cycle compared to traditional reinforced concrete pedestrian bridges and making construction convenient. Attached Figure Description

[0019] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a sectional view of the present invention (1-1).

[0022] Figure 3 This is a sectional view of the present invention (2-2).

[0023] The markings in the diagram are: 1-Main arch, 2-Hanging rod, 3-Bridge deck structure, 4-Arch rib, 5-Horizontal bracing, 6-Ear plate, 7-Tie beam, 8-Longitudinal beam, 9-Horizontal beam, 10-Top plate, 11-Bottom plate, 12-Cantilever. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] In one embodiment of this utility model, such as Figure 1-3 As shown, this embodiment provides a suspension structure for a long-span steel pedestrian bridge, including a main arch 1, hangers 2, and a bridge deck structure 3. The main arch 1 is constructed by welding two arch ribs 4 on both sides and a crossbeam 5 connecting the arch ribs 4. The hanger 2 is a rigid component, with its upper end hinged to the lower part of the arch rib 4 via an ear plate 6, and its lower end hinged to the upper part of the tie beam 7 of the bridge deck structure 3 via an ear plate 6. The bridge deck structure 3 includes a frame composed of tie beams 7, longitudinal beams 8, and transverse beams 9, a top plate 10 covering the frame and a bottom plate 11 covering the frame, and a cantilever 12 on the outer side of the tie beams 7.

[0027] Specifically, this structure includes the upper main arch 1, the middle suspension rod 2, and the lower bridge deck structure 3. The three are hinged together by the ear plates 6 to form an integrated load-bearing system, and the specific construction is as follows:

[0028] The main arch 1 structure is formed by welding two box-section arch ribs 4 on both sides and a central transverse brace 5. The arch ribs 4 have an arc-shaped elevation and a span of 50m. The arch ribs 4 adopt a box section (900mm high, 500mm wide, and 32mm thick), with ear plates 6 welded at the center line of the web of the box section. Multiple sets of transverse braces 5 are set in sections at the top of the arch and at the 1 / 4 span position, and are welded with the arch ribs 4 to form a spatially stable structure, enhancing the wind resistance and overall stability of the main arch 1. The suspender 2 system consists of 6 sets of suspenders 2, each set containing 2 parallel rigid members, evenly distributed along the longitudinal direction of the bridge. Each set of suspenders 2 corresponds to 4 ear plates 6, of which 2 are symmetrically welded to the center line of the lower web of the arch rib 4, and the other 2 are symmetrically welded to the center line of the upper flange of the tie beam 7; the two ends of the suspenders 2 are hinged to the ear plates 6 by pins to form rotatable hinge nodes, realizing the flexible transfer of bridge deck loads to the main arch 1.

[0029] Bridge deck structure 3: The longitudinal frame consists of two sets of parallelogram cross-section tie beams 7 (450mm high, 400mm web spacing, 20mm plate thickness, and 76.3° angle between the web and the top and bottom plates 11) and two sets of longitudinal beams 8 (20mm thick steel beams). The longitudinal beams 8 are arranged in parallel between the two tie beams 7.

[0030] The transverse frame consists of transverse beams 9 (20mm thick steel beams) arranged at equal intervals along the short side of the bridge deck, welded with tie beams 7 and longitudinal beams 8 to form an orthogonal grid frame. The enclosed box girder consists of a top plate 10 (32mm thick) covering the top of the frame and a bottom plate 11 (32mm thick) covering the bottom, together forming an enclosed bridge deck box girder structure, which significantly improves the torsional stiffness of the bridge deck.

[0031] The cantilever 12 structure consists of two sets of cantilever 12 (plate thickness 32mm) symmetrically arranged on the outside of the tie beam 7, which are welded with the top plate 10 and the bottom plate 11 to form a continuous cantilever structure. The cantilever length on one side meets the pedestrian evacuation width requirements, while creating a streamlined appearance.

[0032] In another embodiment of this utility model, the arch rib 4 adopts a box-shaped cross section. The box is 900mm high, 500mm wide, and 32mm thick, and its facade is arranged in an arc shape; the number of the transverse bracing 5 is two sets, which weld the arch ribs 4 on both sides together.

[0033] In another embodiment of this utility model, each group of the hangers 2 includes two parallel rods, and each group of hangers 2 corresponds to four ear plates 6, two of which are symmetrically welded to the lower part of the arch rib 4, and the other two are symmetrically welded to the upper part of the tie beam 7. The two ends of the hangers 2 are hinged to the ear plates 6 by pins.

[0034] In another embodiment of this utility model, the transverse bracing 5 is in multiple sets and is welded to the arch ribs 4 on both sides to form an integral load-bearing structure.

[0035] In another embodiment of this utility model, the tie beam 7 adopts a parallelogram cross-section. The cross-section height is 450mm, the web spacing is 400mm, the angle between the web and the top and bottom plates 11 is 76.3°, and the plate thickness is 20mm.

[0036] In another embodiment of this utility model, the longitudinal beam 8 is arranged parallel to the two tie beams 7, and the transverse beams 9 are arranged at equal intervals along the short side of the bridge deck, with a plate thickness of 20mm.

[0037] In another embodiment of this utility model, the top plate 10 and the bottom plate 11 together constitute a closed bridge deck box structure. The top plate 10 covers the longitudinal beams 8 and the transverse beams 9, forming the top structure of the bridge deck, with a plate thickness of 32mm; the bottom plate 11 covers the bottom of the longitudinal beams 8 and the transverse beams 9, forming the bottom structure of the bridge deck, with a plate thickness of 32mm.

[0038] In another embodiment of this utility model, the cantilever 12 is symmetrically arranged on both sides of the bridge deck and forms a continuous cantilever structure with the top plate 10 and the bottom plate 11. There are two cantilever 12s, located on the outside of the tie beam 7, with a plate thickness of 32mm, forming the structure on both sides of the bridge deck.

[0039] In another embodiment of this utility model, the transverse bracing 5 is segmented at the top of the arch and at the 1 / 4 span position of the arch rib 4.

[0040] In another embodiment of this utility model, the ear plate 6 is welded to the center line of the web of the box-shaped section of the arch rib 4 and the center line of the upper flange of the tie beam 7.

[0041] The installation process of this utility model is as follows:

[0042] Prefabrication and installation of main arch 1: Box-shaped arch ribs 4 are fabricated in the factory. Each arch rib 4 is prefabricated in sections, and welding interfaces for transverse bracing 5 are reserved at the arch crown and 1 / 4 span position. The arch ribs 4 are hoisted to temporary supports on site, and the transverse bracing 5 are welded to form the integral main arch 1. Ear plates 6 are welded to the center line of the lower web of the arch rib 4. Each main arch 1 corresponds to 6 sets of ear plates 6 (43 sets per arch rib).

[0043] Bridge deck structure 3 assembly: Assemble tie beams 7 and longitudinal beams 8 to form a longitudinal skeleton, weld crossbeams 9 to form a grid system, lay top plate 10 and bottom plate 11 to form a closed box, and finally weld cantilever 12. Weld ear plates 6 to the center line of the upper flange of tie beam 7, with 6 sets of ear plates 6 corresponding to each bridge deck structure 3 (3 sets per tie beam). Overall connection and closure: Lift bridge deck structure 3 to the design elevation using lifting equipment, and use pins to hinge the two ends of hangers 2 to the ear plates 6 of arch rib 4 and tie beam 7 respectively. The 6 sets of hangers 2 are simultaneously tensioned and leveled. Remove temporary supports, complete the structural system conversion, and form an overall suspension system with the main arch 1 bearing the load, hangers 2 transmitting force, and the bridge deck system bearing the bending load.

[0044] The horizontal thrust of the main arch 1 in this invention is converted into vertical tension through the hanger 2, which is borne by the bridge deck tie beam 7. The pier foundations only bear vertical loads, solving the high requirements of traditional arch bridges for the horizontal stiffness of the foundation. It is especially suitable for soft soil foundations and areas with dense underground pipelines, achieving zero horizontal thrust. Both the main arch 1 and the bridge deck structure 3 are prefabricated components in the factory and quickly assembled on site through the ear plate 6-column pin joint, significantly shortening the construction period and reducing the time urban roads are closed.

[0045] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A suspension structure for a long-span steel pedestrian bridge, characterized in that: The bridge deck includes a main arch (1), a suspender (2), and a bridge deck structure (3). The main arch (1) is formed by welding two arch ribs (4) on both sides and a cross brace (5) connecting the arch ribs (4). The suspender (2) is a rigid component, with its upper end hinged to the lower part of the arch rib (4) through an ear plate (6), and its lower end hinged to the upper part of the tie beam (7) of the bridge deck structure (3) through an ear plate (6). The bridge deck structure (3) includes a frame composed of a tie beam (7), longitudinal beams (8), and cross beams (9), a top plate (10) covering the frame above and a bottom plate (11) below, and a cantilever (12) on the outside of the tie beam (7).

2. The structure according to claim 1, characterized in that: The arch rib (4) adopts a box-shaped cross section.

3. The structure according to claim 1, characterized in that: Each set of the hangers (2) contains two parallel rods. Each set of hangers (2) corresponds to four ear plates (6), two of which are symmetrically welded to the lower part of the arch rib (4) and the other two are symmetrically welded to the upper part of the tie beam (7). The two ends of the hangers (2) are hinged to the ear plates (6) by pins.

4. The structure according to claim 1, characterized in that: The transverse bracing (5) consists of multiple sets and is welded to the arch ribs (4) on both sides to form an integral load-bearing structure.

5. The structure according to claim 1, characterized in that: The tie beam (7) has a parallelogram cross section.

6. The structure according to claim 1, characterized in that: The longitudinal beams (8) are arranged parallel to each other between the two tie beams (7), and the transverse beams (9) are arranged at equal intervals along the short side of the bridge deck.

7. The structure according to claim 1, characterized in that: The top plate (10) and the bottom plate (11) together form a closed bridge deck box structure.

8. The structure according to claim 1, characterized in that: The cantilever (12) is symmetrically arranged on both sides of the bridge deck and forms a continuous cantilever structure with the top plate (10) and the bottom plate (11).

9. The structure according to claim 4, characterized in that: The transverse bracing (5) is segmented at the top of the arch rib (4) and at the 1 / 4 span position.

10. The structure according to claim 3, characterized in that: The ear plate (6) is welded to the center line of the web of the box section of the arch rib (4) and the center line of the upper flange of the tie beam (7).

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