A large-span double-helix bifurcated arch-beam composite pedestrian bridge structure system

Abstract

The present invention discloses a large-span double-helix bifurcated arch-beam composite pedestrian bridge structure system, which includes double-helix arch ribs, rigid suspenders, tie beams, bridge decks, bifurcated side spans and bridge piers; two double-helix arch ribs are provided for the whole bridge; the tie beams are connected with the two double-helix arch ribs to form an integral force-bearing structure system of the arch-beam composite; the bridge deck is located at the top of the tie beam, providing the bridge deck and directly bearing the live load of the crowd; one end of the bifurcated side span is connected to the middle span, and the other end is connected to the bank by a bifurcated side span structure; the bridge piers are used to bear the load transmitted by the upper structure. The bridge piers are longitudinally arranged at the intersection of the double-helix arch ribs under the bridge, and bifurcated Y-shaped bridge piers are adopted to provide necessary space for the layout of the arch ribs; the present invention adopts three-dimensional space double-helix curve arch ribs, which have the characteristics of good mechanical properties, beautiful landscape, wide field of vision and navigable clearance, ingenious shore connection design and mature and simple construction technology, etc.

Description

Technical Field

[0001] The invention relates to the technical field of bridges, in particular to a large-span double-helix bifurcated arch-beam combined pedestrian bridge structure system. Background Art

[0002] Pedestrian bridges are an important part of urban bridges, which only allow pedestrians or non-motorized vehicles to pass through. Large-span pedestrian bridges are often used as structures that cross important nodes in the city. Their design not only needs to consider factors such as safety, durability, applicability, economy and environmental protection, but also because of their unique geographical location, they often become landmark buildings, which puts higher requirements on the novelty and beauty of their landscape shapes.

[0003] Conventional arch-beam composite bridges are generally composed of arch ribs, tie rods, hangers, carriageway beams (plates) and bridge decks, and the shape of the arch ribs is a two-dimensional plane curve. This type of bridge foundation is not subject to horizontal thrust, has high rigidity, strong spanning capacity, and has certain landscape features, and is widely used in engineering. However, its lateral stability is difficult to guarantee. In order to enhance its lateral stability, it is often necessary to set up lateral connections or connect the arch ribs inward, which greatly affects the pedestrian vision of the bridge. For a landscape pedestrian bridge, it is not only required to have a good landscape effect, but also to serve as a platform to provide pedestrians with the best viewing effect. Secondly, this type of bridge is currently widely used and lacks novelty.

[0004] The spiral arch bridge is a novel space arch-beam combination bridge, and its arch rib is in the shape of a three-dimensional spiral curve. It meets the requirements of urban landscape pedestrian bridges for its novelty and landscape. Representative spiral arch bridges abroad include the Singapore Double Helix Bridge, which is also a pedestrian bridge with a total length of 280m. The two spiral curves are intertwined to form the main force system of the bridge span structure. Representative spiral arch bridges in China include the Beijing Sanshan Bridge, which is not a pedestrian bridge. The bridge is 452m long and adopts a double spiral arch structure. The two spiral arches cross and support each other at the top and bottom, and the bridge deck is suspended from the arch ribs by cables.

[0005] However, common spiral arches have the following disadvantages. (1) The arch ribs extend and interweave on the bridge deck system, forming an embracing and covering effect on the bridge deck system, and also have a great impact on the bridge vision. (2) The double spiral arch ribs surround the bridge deck system, compressing the navigation clearance, increasing the bridge height, the longitudinal slope of the bridge, and the connection difficulty between the bridge and the embankment, reducing the pedestrian experience. (3) The longitudinal stiffness of the double spiral arch ribs is weak, which limits the span of the pedestrian bridge. Cable structures are often used to support the main beams, and the lateral stiffness is weak, which makes it difficult to meet the comfort requirements of the pedestrian bridge. (4) The spatial cable net system arranged around the double spiral structure is difficult to construct.

[0006] In summary, for long-span pedestrian landscape bridges, the conventional arch-beam composite bridge scheme has deficiencies such as insufficient structural novelty and difficulty in ensuring the pedestrian's field of vision. Although the currently emerging spiral arch bridge scheme has a novel and beautiful shape, it also has disadvantages such as restricting the field of vision on the bridge, compressing the navigable clearance, poor comfort, difficulty in being applicable to long-span bridges, and high construction difficulty, which is not conducive to the practical application of such bridge types.

[0007] In response to this, a structural system for a long-span double-spiral bifurcated arch-beam composite pedestrian bridge is proposed. The arch ribs of this system of bridges adopt a spatial double-spiral structure. Two spatial double-spiral structure arch ribs surround the bridge deck system but do not intersect above the bridge deck system, ensuring the field of vision on the bridge to the greatest extent. They also do not intersect within the bridge navigation channel below the bridge deck system, avoiding compressing the navigable clearance. This structure not only has a novel and beautiful shape but also has the advantages of a clear field of vision, no compression of the navigable clearance, large longitudinal and transverse stiffness, large applicable span, good pedestrian comfort, and simple construction, overcoming the disadvantages of the conventional arch-beam composite bridge and the spiral arch bridge. Summary of the Invention

[0008] The purpose of the present invention is to provide a structural system for a long-span double-spiral bifurcated arch-beam composite pedestrian bridge, which inherits the mechanical advantages of the conventional arch-beam composite pedestrian bridge and absorbs the landscape characteristics of the spiral arch pedestrian bridge, and eliminates the defects of the conventional arch-beam composite pedestrian bridge and the spiral arch pedestrian bridge. This pedestrian bridge adopts three-dimensional spatial double-spiral curve arch ribs and has characteristics such as good mechanical properties, beautiful landscape, wide field of vision and navigable clearance, ingenious shore connection design, and mature and simple construction technology.

[0009] The present invention is realized through the following technical solutions:

[0010] A long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system, which includes double-helix arch ribs, rigid suspenders, tie beams, bridge decks, bifurcated side spans and bridge piers. The double-helix arch ribs are formed by two circular steel pipes spirally wound around each other, and the two circular steel pipes are connected by rigid suspenders to form a single-piece arch rib as a whole; the rigid suspenders are divided into rigid suspenders between circular steel pipes and rigid suspenders between the double-helix arch ribs and the tie beams. The rigid suspenders are made of steel structures, and are rectangular or circular. The former rigid suspenders connect the two circular steel pipes to form double-helix arch ribs, and the latter rigid suspenders connect the double-helix arch ribs and the tie beams into a whole. Two double-helix arch ribs are arranged in the whole bridge to jointly form an integral force-bearing structure system of the arch-beam composite; the tie beam is connected with the two double-helix arch ribs to jointly form the force-bearing structure system of the arch-beam composite; the bridge deck is located at the top of the tie beam and is an integral part of the tie beam, providing the bridge deck and directly bearing the live load of the crowd; one end of the bifurcated side span is connected to the middle span, and the other end is connected to the bank by a bifurcated side span structure, making the connection between the bridge and the bank more flexible and adaptable, and more convenient for pedestrian traffic organization; the bridge pier is used to bear the load transmitted by the upper structure, and then transmits the load to the foundation through the bridge pier. The bridge pier is longitudinally arranged at the intersection of the double-helix arch ribs under the bridge, and a bifurcated Y-shaped bridge pier is adopted to provide necessary space for the layout of the arch ribs.

[0011] Further as an improvement of the technical solution of the present invention, the rigid suspenders are divided into the first rigid suspenders between circular steel pipes and the second rigid suspenders between the double-helix arch ribs and the tie beams; the first rigid suspenders connect the two circular steel pipes to form double-helix arch ribs; the second rigid suspenders connect the double-helix arch ribs and the tie beams into a whole.

[0012] Further as an improvement of the technical solution of the present invention, the steel pipes forming the double-helix arch ribs are filled with slightly expanded concrete to enhance their strength, stiffness and stability, reduce the structural section size, and make the structure lighter.

[0013] Further as an improvement of the technical solution of the present invention, under the condition of conventional anti-corrosion treatment of the top plate of the bridge deck, a paving system composed of an ultra-thin UHPC layer and wear-resistant and anti-slip materials is adopted, which has the characteristics of light weight, high strength and good durability. Utilizing its ultra-high strength and ultra-high toughness, the UHPC layer and the steel bridge deck can form a composite structure to improve the stiffness of the bridge deck; utilizing its strong impermeability, the UHPC layer can be used as a waterproof material for the steel bridge deck to prevent the steel bridge panel from being corroded.

[0014] Further as an improvement of the technical solution of the present invention, the approach bridges on both sides can be connected to the bank by other plane alignments such as Y-shaped, arc-shaped, and broken-line-shaped according to the different conditions of the bank and the needs of traffic organization, and the connection method to the bank is flexible and adaptable.

[0015] As a further improvement of the technical solution of the present invention, when the approach bridges on both sides of the pedestrian bridge have a relatively high elevation and cannot be smoothly connected to the shore, a staircase can be used for grounding. The staircase is provided with a "zigzag" barrier-free passage and equipped with staircase lighting effects, presenting a simple, practical and creative overall performance.

[0016] As a further improvement of the technical solution of the present invention, the bridge deck can be provided with structures such as a glass bridge deck and an observation platform according to needs, greatly enhancing the practicability of the pedestrian bridge.

[0017] Advantages of the present invention:

[0018] (1) Adopting three-dimensional space double-helix curve arch ribs, with rigid suspension cables between the arch ribs and between the arch ribs and the bridge deck system, having large longitudinal and transverse stiffness, large applicable span, and good pedestrian comfort.

[0019] (2) The combination of the arch and the beam in three-dimensional space, with the internal forces of the structure self-balanced, not generating lateral thrust on the foundation, and having low requirements for the bearing capacity of the foundation.

[0020] (3) Simple in shape, novel and beautiful, with a strong sense of the times. The gentle curve of the spiral arch matches the simple bridge deck system. The bridge deck system adopts a fish-belly steel box girder, and the overall structure system of the bridge is light and beautiful.

[0021] (4) Two space double-helix structure arch ribs surround the bridge deck system but do not intersect above the bridge deck system. The arch ribs on the bridge deck system are inclined outward at 35° - 40°, providing a better viewing effect for pedestrians without a sense of enclosure.

[0022] (5) The spiral arch ribs do not intersect within the bridge navigation channel range, avoiding compressing the navigable clearance and reducing the longitudinal slope of the bridge.

[0023] (6) Adopting a bifurcated bridge deck structure on both sides to connect with the embankment, having good adaptability to the connection of the embankments on both sides and good organization of pedestrian traffic.

[0024] (7) The steel pipe is filled with slightly expanding concrete, and the arch rib structure has high bearing capacity, minimizing the structural size.

[0025] (8) Under the condition of conventional anti-corrosion treatment of the steel beam top plate, a paving system composed of an ultra-thin UHPC (ultra-high performance concrete) layer and wear-resistant and anti-slip materials has the characteristics of light weight, high strength, and good durability. Utilizing its ultra-high strength and ultra-high toughness, the UHPC layer and the steel bridge deck system can form a composite structure to improve the stiffness of the bridge deck system; utilizing its strong anti-seepage property, the UHPC layer can be used as a waterproof material for the steel bridge deck to prevent the steel bridge deck from being corroded.

[0026] (9) Simple in structure, the main bridge is prefabricated in the factory and integrally lifted or segmentally assembled on site. The construction plan is advanced, the construction method is mature, and the overall construction period is relatively short. Brief Description of the Drawings

[0027] Figure 1 It is the plan layout diagram of the pedestrian bridge in the embodiment of the present invention;

[0028] Figure 2 It is the elevation layout diagram of the pedestrian bridge in the embodiment of the present invention;

[0029] Figure 3 It is the cross-sectional layout diagram of the main bridge span center of the pedestrian bridge in the embodiment of the present invention;

[0030] Figure 4 It is the cross-sectional layout diagram of the main pier of the main bridge of the pedestrian bridge in the embodiment of the present invention.

[0031] In the drawings: 1 - double helix arch ribs; 2 - rigid suspension rods; 3 - tie beams; 4 - bridge deck system; 5 - bifurcated side spans; 6 - bridge piers; 7 - circular steel pipes; 8 - riverbanks; 9 - foundations; 10 - glass bridge decks; 11 - viewing platforms; 12 - steel crossbeams; 13 - steel top and bottom plates; 14 - steel webs; 15 - stairways. Detailed implementation manners

[0032] The present invention will be described in detail below in conjunction with the drawings and specific embodiments. Here, the schematic embodiments and descriptions of the present invention are used to explain the present invention, but do not limit the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. 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 situations.

[0035] In addition, in the present invention, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature; in addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] Referring to Figures 1 to 4 , a long-span double-helix bifurcated arch-beam composite pedestrian bridge structural system, which includes double-helix arch ribs 1, rigid suspenders 2, tie beams 3, deck systems 4, bifurcated side spans 5 and bridge piers 6. The double-helix arch ribs 1 are formed by two circular steel pipes 7 spirally surrounding each other, and the two circular steel pipes 7 are connected by rigid suspenders 2 to form an integral single-piece double-helix arch rib 1; the rigid suspenders 2 are divided into rigid suspenders 2 between the circular steel pipes 7 and rigid suspenders 2 between the double-helix arch ribs 1 and the tie beams 3. The rigid suspenders 2 are made of steel structures and have rectangular or circular cross-sections. The former rigid suspenders 2 connect the two circular steel pipes 7 to form the double-helix arch ribs 1, and the latter rigid suspenders 2 connect the double-helix arch ribs 1 and the tie beams 3 into an integral whole. Two double-helix arch ribs 1 are provided throughout the bridge to jointly form an integral force-bearing structural system of the arch-beam combination; the tie beams 3 are connected to the two double-helix arch ribs 1 to jointly form a force-bearing structural system of the arch-beam combination; the deck system 4 is located at the top of the tie beams 3 and is a component of the tie beams 3, providing a bridge deck for the bridge and directly bearing the live load of pedestrians; one end of the bifurcated side span 5 is connected to the middle span, and the other end is connected to the bank 8 by means of the bifurcated side span 5 structure, making the connection between the bridge and the bank 8 more flexible and more adaptable, and more convenient for pedestrian traffic organization; the bridge piers 6 are used to bear the loads transmitted by the upper structure, and then transmit the loads to the foundation 9 through the bridge piers 6. The bridge piers 6 are longitudinally arranged at the intersection of the double-helix arch ribs 1 under the bridge, and bifurcated Y-shaped bridge piers are used to provide necessary space for the layout of the double-helix arch ribs 1.

[0037] Specifically, in the solution of this embodiment, the circular steel pipes 7 forming the double-helix arch ribs 1 are filled with slightly expanded concrete to enhance their strength, stiffness and stability, reduce the structural cross-sectional size, and make the structure lighter.

[0038] Specifically, in the solution of this embodiment, under the condition of conventional anti-corrosion treatment of the top plate of the bridge deck system 4, a paving system composed of an ultra-thin UHPC layer and wear-resistant and anti-slip materials has the characteristics of light weight, high strength, and good durability. Utilizing its ultra-high strength and ultra-high toughness, the UHPC layer and the steel bridge deck system can form a composite structure to improve the stiffness of the bridge deck system; utilizing its strong anti-seepage property, the UHPC layer can be used as a waterproof material for the steel bridge deck to prevent the steel bridge deck from being corroded.

[0039] Specifically, in the solution of this embodiment, the bifurcated side spans 5 on both sides can be connected to the bank 8 in other plane alignments such as Y-shaped, arc-shaped, and broken-line-shaped according to the different conditions of the bank 8 and the needs of traffic organization, and the shore connection method is flexible and highly adaptable.

[0040] Specifically, in the solution of this embodiment, when the elevation of the bifurcated side spans 5 on both sides of the pedestrian bridge is too high to be smoothly connected to the shore, it can be grounded in the form of a staircase 15. The staircase 15 is provided with a zigzag barrier-free passage and equipped with staircase lighting effects, and the overall performance is simple, practical, and creative.

[0041] Specifically, in the solution of this embodiment, the bridge deck system 4 can be provided with structures such as a glass bridge deck 10 and an observation platform 11 according to needs, greatly enhancing the practicality of the pedestrian bridge.

[0042] Specifically, when in use, the following design can be adopted but is not limited to:

[0043] (1) Overall design of the large-span double-helix bifurcated arch-beam composite pedestrian bridge structure system:

[0044] The main bridge span combination (L1 + L2 + L3) is taken as a through arch-beam composite bridge of (66 + 188 + 66) m, and the approach bridge span combination (L4 + L5 + L6) is taken as (40 + 35 + 35) m, and the total length of the bridge is 430 m. The main bridge is made of all-steel structure. The bifurcated side spans 5 of the bridge deck plane are generally arranged in a Y shape, and an oval observation platform 11 is formed in the middle L3 span. The beam width B of the standard section of the bridge is taken as 13 m, the cross slope i2 is taken as 1%, the longitudinal slope i1 is taken as 2%, and the radius R of the vertical curve is taken as 1500 m for arc transition.

[0045] (2) Design of the double-helix arch rib 1:

[0046] The double-helix arch rib 1 is made of Q500qD steel. Its arch axis is a space curve formed by connecting two reverse-bending circular arcs tangent to each other on two vertical planes. The rise f2 of the double-helix arch rib 1 is taken as 22.52 m, the rise-span ratio is 1 / 8.4, the rise f1 of the inner arch of the main span is taken as 15.86 m, and the rise-span ratio is 1 / 11.8. The diameter of the circular steel pipe 7 is 1.2 m; the two meet at the junction of the double-helix arch rib 1 and the tie beam 3 and at the arch feet of the double-helix arch rib 1.

[0047] (3) Design of the rigid suspension rod 2:

[0048] The rigid suspenders 2 are arranged in groups every 6 meters longitudinally along the bridge and are made of Q420qD steel. The rigid suspenders 2 can have a rectangular or circular cross-section, and the side length or diameter D can be taken as 0.4 m.

[0049] (4) Design of the cross beam 3:

[0050] The cross beam 3 in the standard section adopts a separated double steel box girder and is made of Q500qD steel. The two boxes are connected by a steel cross beam 12. The steel cross beam 12 is at the same height as the cross beam 3. A glass bridge deck 10 is laid between the two box chambers, and the glass is tempered frosted glass. Each cross beam 3 adopts a double-chamber cross-section, and the outer contour of the cross beam 3 is designed to be fish-belly shaped. The height H of the box girder is taken as 1.5 m, and the width B' of the cross beam 3 is taken as 4.5 m; the top and bottom steel plates 13 of the cross beam 3 are 24 mm thick, and the steel web 14 is 14 mm thick.

[0051] (5) Design of the bifurcated side span 5:

[0052] The bifurcated side span 5 adopts a variable-width bifurcated layout in the plane. The width b of a single limb in the bifurcated section is taken as 9 m. The superstructure of the bifurcated side span 5 all adopts a steel box girder, and the material is Q345C.

[0053] (6) Design of the pier 6:

[0054] The pier 6 adopts a Y-shaped pier. The upper V-brace of the pier 6 adopts a steel structure and has a round-ended cross-section. An arc transition is set between the two limbs; the lower part of the pier 6 transitions to a concrete slab pier, and an arc chamfer is set.

[0055] The beneficial effects of the present invention:

[0056] (1) The three-dimensional space double-helix curve arch ribs are adopted. Rigid suspension cables are used between the arch ribs and between the arch ribs and the bridge deck system. It has large longitudinal and transverse stiffness, a large applicable span, and good pedestrian comfort.

[0057] (2) The combination of the arch and the beam in three-dimensional space makes the internal forces of the structure self-balanced, does not generate lateral thrust on the foundation, and has low requirements for the bearing capacity of the foundation.

[0058] (3) The shape is simple, novel and beautiful, with a strong sense of the times. The gentle curve of the spiral arch matches the simple bridge deck system. The bridge deck system adopts a fish-belly type steel box girder, and the overall structure system of the bridge is light and beautiful.

[0059] (4) Two space double-helix structure arch ribs surround the bridge deck system but do not intersect above the bridge deck system. The arch ribs on the bridge deck system are inclined outward at 35° - 40°, providing a good viewing effect for pedestrians and having no sense of enclosure.

[0060] (5) The spiral arch ribs do not intersect within the bridge navigation range, avoiding compression of the navigation clearance and reducing the longitudinal slope of the bridge.

[0061] (6) The two sides adopt a bifurcated bridge deck structure to connect with the embankments, which has good adaptability to the connection of the two embankments and good pedestrian traffic organization.

[0062] (7) The steel pipe is filled with slightly expanding concrete, and the arch rib structure has high bearing capacity, reducing the structural size to the greatest extent.

[0063] (8) Under the condition of conventional anti-corrosion treatment on the steel beam top plate, a paving system composed of an ultra-thin UHPC (Ultra-High Performance Concrete) layer and wear-resistant and anti-slip materials is adopted, which has the characteristics of light weight, high strength, and good durability. By virtue of its ultra-high strength and ultra-high toughness, the UHPC layer and the steel bridge deck system can form a composite structure to improve the stiffness of the bridge deck system; by virtue of its strong impermeability, the UHPC layer can be used as a waterproof material for the steel bridge deck to prevent the steel bridge deck from being corroded.

[0064] (9) The structure is simple. The main bridge is prefabricated in the factory and integrally lifted or segmentally assembled on site. The construction plan is advanced and the construction method is mature, and the overall construction period is relatively short.

[0065] The above has introduced the technical solutions provided by the embodiments of the present invention in detail. Specific examples are used in this article to elaborate on the principles and implementation manners of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to helping understand the principles of the embodiments of the present invention; at the same time, for those of ordinary skill in the art, according to the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system, Characterized in that: This structure system includes double-helix arch ribs, rigid suspenders, tie beams, bridge decks, bifurcated side spans and bridge piers; Two double-helix arch ribs are arranged throughout the bridge to jointly form an integral stress structure system of the arch-beam composite; The tie beam is connected to the two double-helix arch ribs to jointly form the stress structure system of the arch-beam composite; The bridge deck is located on top of the tie beam, is an integral part of the tie beam, provides the bridge deck for the bridge and directly bears the live load of the crowd; One end of the bifurcated side span is connected to the middle span, and the other end is connected to the bank by a bifurcated side span structure; The bridge pier is used to bear the load transmitted by the upper structure, and then transmits the load to the foundation through the bridge pier. The bridge pier is longitudinally arranged at the intersection of the double-helix arch ribs under the bridge, and a bifurcated Y-shaped bridge pier is adopted to provide necessary space for the layout of the arch ribs.

2. The long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system according to claim 1, Characterized in that: The double-helix arch rib is formed by two circular steel pipes spirally wound around each other, and the two circular steel pipes are connected into an integral single-piece arch rib by rigid suspenders.

3. The long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system according to claim 2, Characterized in that: The rigid suspenders are divided into the first rigid suspenders between the circular steel pipes and the second rigid suspenders between the double-helix arch ribs and the tie beam; The first rigid suspenders connect the two circular steel pipes to form the double-helix arch rib; The second rigid suspenders connect the double-helix arch rib and the tie beam into an integral whole.

4. The long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system according to claim 3, Characterized in that: The circular steel pipes forming the double-helix arch rib are filled with slightly expanded concrete.

5. The long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system according to claim 1, Characterized in that: The top plate of the bridge deck is composed of a paving system of an ultra-thin UHPC layer and wear-resistant and anti-slip materials.

6. The long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system according to claim 1, Characterized in that: The two sides of the bifurcated side spans can be connected to the bank by using plane linear shapes such as Y-shaped, arc-shaped, or broken-line-shaped according to different conditions of the bank and the needs of traffic organization.

7. The long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system according to claim 1, Characterized in that: The two sides of the bifurcated side spans are grounded in the form of stairways.

8. The long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system according to claim 1, Characterized in that: The bridge deck is set as a glass bridge deck or an observation platform.

9. The long-span double-helix bifurcated arch-beam composite pedestrian bridge structure system according to claim 1, Characterized in that: The rigid suspenders are made of steel structures and are rectangular or circular.

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