T-shaped asymmetric single-tower cable-stayed footbridge combined with viewing platform

Abstract

The invention relates to the technical field of bridges, and discloses a T-shaped asymmetric single-tower cable-stayed footbridge combined with a viewing platform. Comprising a main span main beam with the axis being a straight line, four connection ports located at the tail end of the main span main beam, a side span single-side suspension main beam connected with the connection port A1 and the connection port A2 and with the axis being an arc line, and an inverted-V-shaped steel shell structure bridge tower obliquely arranged above the side span single-side suspension main beam. A plurality of groups of side span stay cables for connecting the steel shell structure bridge tower and the side span single-side suspension girder, and a plurality of groups of main span stay cables for connecting the steel shell structure bridge tower and the main span girder, a straight-line section main span girder spans a road, and an arc-shaped section side span stay cable is close to an open sea; meanwhile, the four connection ports of the bridge main body effectively give consideration to the four functions of people stream transmission, coastal viewing, urban landmarks and slow-moving leisure, extremely high commercial value is reflected, the shape of the bridge can be coordinated with surrounding scenery, and the structure of the bridge main body has extremely high landmark performance.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and more particularly to a T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform. Background Art

[0002] As my country's urbanization development keeps pace with the times, the term "urban slow-moving system" has been mentioned more and more frequently in the process of domestic urban planning and construction. The "Xiamen Mountain and Sea Health Trail" around the city built in Xiamen in 2021 has played a demonstration and leading role. Since then, Quanzhou, Wuxi, Changsha, and Dongguan have begun to plan and build similar projects such as the "Quanzhou Cross-River Slow-Moving System" and the "Wuxi Ancient Canal Slow-Moving System".

[0003] In a large-scale slow-moving system, the design of node bridges is a difficult problem because of their special features that are completely different from conventional bridges. They often require more than three docking points to coordinate and transport people in all directions. At the same time, they are located in the city and are so close to people that their design, viewing angle, and obstruction of the original appearance of the city all need to be carefully considered. In addition to powerful scientific computing tools, supporting such a complex multi-objective optimization problem also tests the designer's cultural perception, aesthetic literacy and other abilities. This patent proposes a pedestrian bridge system that can meet the high standards of a "node bridge", aiming to become a reference for future urban temperament improvement and modern urban construction. Summary of the invention

[0004] In order to overcome the deficiencies of the existing bridge system, the present invention provides a T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform, which can meet the diversified needs and limitations of key node bridges in the city.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform, characterized in that it comprises a main span main beam with a straight axis, four docking ports located at the tail end of the main span main beam, a side span single-sided suspension main beam connecting the A1 docking port and the A2 docking port and with an arc axis, an inverted V-shaped steel shell structure bridge tower obliquely arranged above the side span single-sided suspension main beam, an array of side span inclined cables connecting the steel shell structure bridge tower and the side span single-sided suspension main beam, and an array of main span inclined cables connecting the steel shell structure bridge tower and the main span main beam; The upper end of the main span inclined cable is anchored to the top of the steel shell structure bridge tower, and the lower end is anchored to the central axis of the main span main beam. The bottom of the connection between the main span main beam, A3 connection port and A4 connection port is provided with a beam end pier. The upper end of the side span inclined cable is anchored to the top of the steel shell structure bridge tower, and the lower end is anchored to the beam side suspension point of the side span single-sided suspended main beam. The roots of the two ends of the steel shell structure bridge tower are respectively intersected with the oblique legs of the compression rod to form an integral node. The top of the oblique leg of the compression rod supports the end of the single-sided suspended main beam of the side span and is anchored to the ground anchor rod. The A1 connection port and the A2 connection port are connected to the end of the single-sided suspended main beam of the side span and the bifurcated end of the main span main beam.

[0006] As a preferred technical solution of the present invention, the main span main beam is made of a large cantilever steel-concrete composite beam section, which includes a main span central steel box beam that occupies (1 / 5-1 / 4) of the main span main beam width; Hollow main span transverse steel structure cantilevers are welded on both sides of the main span central steel box girder, main span shear bolts are welded between the upper flange of the main span central steel box girder and the upper flange of the main span transverse steel structure cantilever, the upper surface of the main span shear bolts is covered and connected with the main span reinforced concrete bridge deck, a main span transverse water-collecting slope is arranged along the surface of the main span reinforced concrete bridge deck, a main span inclined cable ear plate is vertically arranged on the top of the main span central steel box girder, the main span inclined cable ear plate passes through the main span reinforced concrete bridge deck and the main span transverse water-collecting slope, the outer side of the main span transverse steel structure cantilever is arranged vertically upward, and the main span bridge deck handrail is installed on the inner side thereof.

[0007] As a preferred technical solution of the present invention, the side span single-sided suspended main beam is made of a cross-section form of a large cantilever steel-concrete composite beam, and the side span single-sided suspended main beam includes a hollow side span transverse steel structure large cantilever extending along one side of the side span central steel box beam, and a side span vertical anchoring arm arranged upward along the other side of the side span central steel box beam, and the upper flange of the side span central steel box beam and the upper flange of the side span transverse steel structure large cantilever are welded with side span shear bolts, the upper surface of the side span shear bolts is covered and connected with the side span reinforced concrete bridge deck, a side span transverse water collection slope is arranged along the surface of the side span reinforced concrete bridge deck, a side span inclined cable ear plate is arranged on the top of the side span central steel box beam, and one side of the main span transverse steel structure large cantilever is arranged vertically upward, and a side span bridge deck handrail is installed on its inner side.

[0008] As a preferred technical solution of the present invention, the side span cable ear plate is connected to the bottom of the side span cable, and the upper surface of the side span transverse water-collecting slope is inclined downward along the large cantilever of the side span transverse steel structure to the central steel box girder of the side span, and the surface of the side span transverse water-collecting slope located on the top of the central steel box girder of the side span protrudes upward, and the height of the protrusion is lower than the surface of the side span transverse water-collecting slope on the side away from the central steel box girder of the side span.

[0009] As a preferred technical solution of the present invention, the width of the main span main beam bridge deck is (3-8) m, the beam height of the central steel box beam of the main span is (1 / 120-1 / 80) of the span of the main span main beam, the flange plate thickness of the central steel box beam of the main span is (20-30) mm, the web plate thickness of the central steel box beam of the main span is preferably (14-20) mm, the thickness of the reinforced concrete bridge deck of the main span is (100-150) mm, the reinforced concrete bridge deck of the main span is made of self-compacting concrete with a concrete strength not less than C40, and the spacing of the large cantilevers of the transverse steel structure of the main span in the longitudinal bridge direction is (1.5-2.5) m.

[0010] As a preferred technical solution of the present invention, two connection ports are respectively branched out at both ends of the main span main beam, the span of the main span main beam is (50-200) m, and a main span transverse water-collecting slope is provided with a main span inclined cable ear plate, which is protruded at the top, and is concave downward along both sides of the top protrusion, and the heights of both ends of the main span transverse water-collecting slope are higher than both sides of the top protrusion, and the main span inclined cable ear plate is connected to the main span inclined cable.

[0011] As a preferred technical solution of the present invention, the upper facade of the steel shell structure bridge tower is inclined in the direction of the main span main beam, and the inclination angle is (15-25) degrees. The steel shell structure bridge tower is made of a steel shell concrete structure, and the concrete adopts self-compacting concrete with a strength not less than C35. The thickness of the steel plate of the steel shell structure bridge tower is (20-40) mm, and the thickness of the plate at the connection node with the compression rod oblique leg is 40 mm. The steel shell structure bridge tower adopts a 20 mm thick steel plate within a length range where the steel plate section changes little, and the width of the steel shell structure bridge tower is 1 / 50 of the span of the main span main beam.

[0012] As a preferred technical solution of the present invention, the root of the steel shell structure bridge tower is fixedly connected to the inclined leg of the compression rod by means of prestressed anchor bolts and PBL steel-concrete connecting keys, the steel shell structure bridge tower is connected to the main span inclined cable and the side span inclined cable by means of fork ear anchors, the consolidation point at the intersection of the steel shell structure bridge tower and the main span main beam is connected by a steel structure, and the top anchor point of the steel shell structure bridge tower is the center of the arc line of the side span single-sided suspended main beam with the arc line as the axis on the plane.

[0013] As a preferred technical solution of the present invention, the main span cable and the side span cable are made of fully enclosed high-vanadium cables, the anchor cable distance on the beam of the side span cable is (4-12) m, and the ear plate perforations at the top of the main span cable and the side span cable are welded to the flange of the steel shell structure bridge tower.

[0014] As a preferred technical solution of the present invention, the beam end pier has three legs, and the three legs are respectively located on the main beams in three different directions of the main span main beam, A3 connection and A4 connection, and the safety factor of the ground anchor cable of the ground anchor rod is greater than 3.0.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) Coordinate and transport the pedestrian flows generated by the four docking points; (2) The structure itself has good landscape characteristics and is equipped with a viewing platform on the bridge; (3) The applicable span range is wide, and it is suitable for large spans of (50-200) m; (4) Strong economic resilience, with the amount of steel and concrete used per square meter lower than the average level of similar types of bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the cross section of the main span main beam of the present invention; Figure 3 It is a schematic diagram of the cross section of the side span single-sided suspended main beam of the present invention.

[0017] In the figure: 1. A1 docking port; 2. A2 docking port; 3. A3 docking port; 4. A4 docking port; 5. Steel shell structure bridge tower; 6. Main span cable; 7. Side span cable; 8. Main span main beam; 81. Main span central steel box beam; 82. Main span transverse steel structure large cantilever; 83. Main span cable ear plate; 84. Main span reinforced concrete bridge deck; 85. Main span shear bolts; 86. Main span transverse water collection slope ; 87. Main span bridge deck handrail; 9. Side span single-sided suspended main beam; 91. Side span central steel box beam; 92. Side span transverse steel structure large cantilever arm; 93. Side span inclined cable ear plate; 94. Side span reinforced concrete bridge deck; 95. Side span shear bolts; 96. Side span transverse water collection slope; 97. Side span bridge deck handrail; 98. Side span vertical anchor arm; 10. Ground anchor rod; 11. Compression rod inclined leg; 12. Beam end pier. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1-3As shown, the present invention provides a T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform, characterized in that it includes a main span main beam 8 with a straight axis, four docking ports located at the rear end of the main span main beam 8, a side span single-sided suspension main beam 9 connecting the A1 docking port 1 and the A2 docking port 2 and with an arc axis, an inverted V-shaped steel shell structure bridge tower 5 inclinedly arranged above the side span single-sided suspension main beam 9, an array of side span inclined cables 7 connecting the steel shell structure bridge tower 5 and the side span single-sided suspension main beam 9, and an array of main span inclined cables 6 connecting the steel shell structure bridge tower 5 and the main span main beam 8; The upper end of the main span inclined cable 6 is anchored to the top of the steel shell structure bridge tower 5, and the lower end is anchored to the central axis of the main span main beam 8. The bottom of the connection between the main span main beam 8, A3 docking port 3 and A4 docking port 4 is provided with a beam end pier 12. The upper end of the side span inclined cable 7 is anchored to the top of the steel shell structure bridge tower 5, and the lower end is anchored to the beam side suspension point of the side span single-sided suspension main beam 9. The roots of both ends of the steel shell structure bridge tower 5 are respectively intersected with the compression rod oblique legs 11 to form an integral node. The top of the compression rod oblique legs 11 supports the end of the side span single-sided suspension main beam 9 and is anchored to the ground anchor rod 10. The A1 docking port 1 and the A2 docking port 2 are connected to the bifurcated ends of the side span single-sided suspension main beam 9 and the main span main beam 8. It should be noted that the main span main beam 8 and the side span single-sided suspension main beam 9 form an inverted V-shaped bridge tower. With the inverted V-shaped bridge tower as the fulcrum, the load of the main span main beam 8 with a straight axis and the load of the side span single-sided suspension main beam 9 with an arc axis are balanced through the main span inclined cables 6 and the side span inclined cables 7. Since the spans of the main span main beam 8 and the side span single-sided suspension main beam 9 can be adjusted according to the specific conditions of the site, their balance relationship will not be perfect forever, and the anchor rods 10 at both ends of the side span single-sided suspension main beam 9 cooperate with the pull-out piles to balance the loads on both sides. The main span beam 8 of the straight section crosses a 12-lane road with three central dividers, and the side span cable 7 of the curved section faces the open sea. At the same time, the four connection ports of the bridge body effectively take into account the four major functions of passenger flow transmission, coastal viewing, city landmark, and slow-moving leisure, reflecting a strong commercial value. The shape of the bridge can be coordinated with the surrounding scenery, making the main structure of the bridge highly iconic.

[0020] Further, the main span main beam 8 is made of a cross-section of a large cantilever steel-concrete composite beam, which includes a main span central steel box beam 81 that occupies 1 / 5-1 / 4 of the width of the main span main beam 8; Hollow main span transverse steel structure cantilever arms 82 are welded on both sides of the main span central steel box girder 81. Main span shear bolts 85 are welded between the upper flange of the main span central steel box girder 81 and the upper flange of the main span transverse steel structure cantilever arm 82. The upper surface of the main span shear bolts 85 is covered and connected with the main span reinforced concrete bridge deck 84. A main span transverse water collection slope 86 is arranged along the surface of the main span reinforced concrete bridge deck 84. A main span inclined cable ear plate 83 is vertically arranged on the top of the main span central steel box girder 81. The main span inclined cable ear plate 83 passes through the main span reinforced concrete bridge deck 84 and the main span transverse water collection slope 86. The outer side of the main span transverse steel structure cantilever arm 82 is vertically arranged upward, and the inner side thereof is installed with a main span bridge deck handrail 87. It should be noted that the bending stiffness of the section is mainly provided by the steel-concrete composite section, and the torsional stiffness of the section is mainly provided by the central steel box girder 81 of the main span. The large-space hollow structure improves the structural efficiency, reduces the deadweight of the structure, and strengthens the heat exchange effect of the structure to reduce the temperature gradient stress.

[0021] Further, the side span unilateral suspension main beam 9 is made of a cross-section form of a large cantilever steel-concrete composite beam, the upper flange of the side span central steel box beam 91 is welded to the upper flange of the side span transverse steel structure large cantilever 92 with side span shear bolts 95, the upper surface of the side span shear bolts 95 is covered and connected with a side span reinforced concrete bridge deck 94, a side span transverse water collection slope 96 is arranged along the surface of the side span reinforced concrete bridge deck 94, a side span inclined cable ear plate 93 is arranged on the top of the side span central steel box beam 91, one side of the main span transverse steel structure large cantilever 82 is arranged vertically upward, and a side span bridge deck handrail 97 is installed on the inner side thereof; It should be noted that the side span single-sided suspension main beam 9 has two main features: an arc-shaped axis and a single-sided suspension. The arc-shaped axis forms a variable viewing angle, and the single-sided suspension avoids the cable angle from occupying the walking space on the bridge deck; the side span single-sided suspension main beam 9 also adopts a steel-concrete composite section with a large cantilever arm. Since the side span inclined cable 7 is suspended on one side, the section arrangement of the side span single-sided suspension main beam 9 also forms an asymmetric form; The side span single-sided suspended main beam 9 comprises a hollow side span transverse steel structure cantilever arm 92 extending along one side of the side span central steel box beam 91, and a side span vertical anchoring arm 98 arranged upward along the other side of the side span central steel box beam 91. This arrangement makes the cross-sectional center of gravity of the side span single-sided suspended main beam 9 closer to the fulcrum of the side span inclined cable 7, thereby reducing the eccentric torque. The side span central steel box beam 91 extends the side span vertical anchoring arm 98 upward on the side of the side span inclined cable 7, so that the extension line of the side span inclined cable 7 passes through the centroid of the side span single-sided suspended main beam 9. No torsional torque is generated under constant load, and the torque generated by live load is borne by the torsional resistance of the side span central steel box beam 91.

[0022] Furthermore, the side span cable ear plate 93 is connected to the bottom of the side span cable 7, and the upper surface of the side span transverse water-collecting slope 96 is inclined downward along the side span transverse steel structure large cantilever 92 to the side span central steel box girder 91, and the surface of the side span transverse water-collecting slope 96 located on the top of the side span central steel box girder 91 protrudes upward, and the protruding height is lower than the surface of the side span transverse water-collecting slope 96 away from the side span central steel box girder 91.

[0023] Furthermore, the width of the bridge deck of the main span main beam 8 is (3-8) m, the beam height of the main span central steel box beam 81 is (1 / 120-1 / 80) of the span of the main span main beam 8, the flange plate thickness of the main span central steel box beam 81 is (20-30) mm, the web plate thickness of the main span central steel box beam 81 is preferably (14-20) mm, the thickness of the main span reinforced concrete bridge deck 84 is (100-150) mm, the main span reinforced concrete bridge deck 84 is made of self-compacting concrete with a concrete strength not less than C40, and the spacing of the main span transverse steel structure cantilever 82 in the longitudinal bridge direction is (1.5-2.5) m.

[0024] Furthermore, two ends of the main span main beam 8 are respectively branched into two connection ports, and the span of the main span main beam 8 is (50-200) m. The main span main beam 8 has a relatively large span, which can be varied between (50-200) m, and can be used to cross roads with up to 12 lanes and a central dividing strip and a central underpass, or a river. The curved side span single-side suspended main beam 9 can be placed at locations with good viewing views, such as the seaside, the riverside, and important CBD internet celebrity nodes in the city; The main span transverse water-collecting slope 86 provided at the main span inclined cable ear plate 83 is convex at the top and concave downward along both sides of the top convexity, and the heights of the two ends of the main span transverse water-collecting slope 86 are higher than both sides of the top convexity. The main span inclined cable ear plate 83 is connected to the main span inclined cable 6.

[0025] Furthermore, the upper facade of the steel shell structure bridge tower 5 is inclined toward the main span main beam 8, and the inclination angle is (15-25) degrees, which has the advantages of high bearing capacity, high rigidity, eliminating complex components such as stiffening ribs, reducing welding, and convenient construction. The concrete adopts self-compacting concrete with a strength not less than C35. The thickness of the steel plate of the steel shell structure bridge tower 5 is (20-40) mm, and the thickness of the plate at the connection node with the compression rod oblique leg 11 is 40 mm. The steel shell structure bridge tower 5 adopts a 20 mm thick steel plate within the length range where the steel plate section changes little. The width of the steel shell structure bridge tower 5 is 1 / 50 of the span of the main span main beam 8; The steel shell structure bridge tower 5 is made of steel shell concrete structure. The steel shell is poured with concrete inside, and the steel shell plays a role of a hoop. The formed combined section has high bearing capacity and excellent toughness. The poured concrete effectively limits the local buckling of the steel shell, avoiding the complex welding workload of stiffening ribs, and the steel shell becomes the forming template for concrete pouring. Compared with pure steel shell bridge towers, it saves construction costs, and significantly reduces template costs compared with reinforced concrete bridge towers, which is convenient for construction; Furthermore, the root of the steel shell structure bridge tower 5 is fixedly connected to the compression rod inclined leg 11 by means of prestressed anchor bolts and PBL steel-concrete connection keys, the steel shell structure bridge tower 5 is connected to the main span inclined cable 6 and the side span inclined cable 7 by means of fork ear anchors, and the consolidation point at the intersection of the steel shell structure bridge tower 5 and the main span main beam 8 is connected by a steel structure; In this way, the angle between the side span inclined cable 7 and the horizontal plane can be completely consistent, so as to facilitate the control of the extension line of the side span inclined cable 7 through the center of gravity of the section of the side span single-sided suspended main beam 9, thereby eliminating the dead load overturning moment.

[0026] Furthermore, the main span cable 6 and the side span cable 7 are made of fully enclosed high-vanadium cables. The anchor cable distance on the beam of the side span cable 7 is (4-12) m. A large cable distance corresponds to a large cable section size, and a small cable distance corresponds to a small cable section size. This size selection is mainly based on the architectural visual perspective. The ear plate perforated plugs at the top of the main span inclined cable 6 and the side span inclined cable 7 are welded to the flange of the steel shell structure bridge tower 5; the horizontal component force generated by the main span inclined cable 6 and the side span inclined cable 7 forms an effective prestressing stress on the concrete bridge deck of the corresponding main beam, delaying or even avoiding the possibility of cracking of the concrete bridge deck, and ensuring durability.

[0027] Fork-ear type cable anchors are used at both ends of the side span inclined cables 7 to release the rotation constraint. The tensioning end is located at the beam end for ease of operation. The main span inclined cables 6 and the side span inclined cables 7 use fully enclosed high-vanadium cables with good durability and fatigue resistance. For economic reasons, steel strand cables can also be used. This type of fully enclosed high-vanadium cable has the advantages of good durability, long service life and strong fatigue resistance. The outside of the cable can be covered with a fire-retardant coating.

[0028] Furthermore, the beam end pier 12 has three legs, and the three legs are respectively located on the main beams in three different directions of the main span main beam 8, the A3 connection port 3 and the A4 connection port 4, and the safety factor of the ground anchor cable of the ground anchor rod 10 is greater than 3.0.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform, characterized in that: It comprises a main span main beam (8) with a straight axis, four docking ports located at both ends of the main span main beam (8), a side span single-sided suspension main beam (9) connecting the A1 docking port (1) and the A2 docking port (2) and with an arc axis, an inverted V-shaped steel shell structure bridge tower (5) inclinedly arranged above the side span single-sided suspension main beam (9), a group of side span inclined cables (7) connecting the steel shell structure bridge tower (5) and the side span single-sided suspension main beam (9), and a group of main span inclined cables (6) connecting the steel shell structure bridge tower (5) and the main span main beam (8); The upper end of the main span inclined cable (6) is anchored to the top of the steel shell structure bridge tower (5), and the lower end is anchored to the center axis of the main span main beam (8). A beam end pier (12) is provided at the bottom of the connection between the main span main beam (8), the A3 connection port (3) and the A4 connection port (4). The upper end of the side span inclined cable (7) is anchored to the top of the steel shell structure bridge tower (5), and the lower end is anchored to the beam side suspension point of the side span single-sided suspension main beam (9). The roots of both ends of the steel shell structure bridge tower (5) intersect with the compression rod inclined legs (11) to form an integral node. The top of the compression rod inclined legs (11) supports the end of the side span single-sided suspension main beam (9) and is anchored to the anchor rod (10). The A1 connection port (1) and the A2 connection port (2) connect the side span single-sided suspension main beam (9) and the bifurcated end of the main span main beam (8).

2. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 1, characterized in that: The main span main beam (8) is made of a large cantilever steel-concrete composite beam section, the section comprising a main span central steel box beam (81) occupying 1 / 5-1 / 4 of the width of the main span main beam (8); Hollow main span transverse steel structure cantilever arms (82) are welded on both sides of the main span central steel box girder (81); the upper flange of the main span central steel box girder (81) and the upper flange of the main span transverse steel structure cantilever arm (82) are welded with main span shear bolts (85); the upper surface of the main span shear bolts (85) is covered and connected with a main span reinforced concrete bridge deck (84); a main span transverse water collection slope (86) is arranged along the surface of the main span reinforced concrete bridge deck (84); a main span inclined cable ear plate (83) is vertically arranged on the top of the main span central steel box girder (81); the main span inclined cable ear plate (83) passes through the main span reinforced concrete bridge deck (84) and the main span transverse water collection slope (86); the outer side of the main span transverse steel structure cantilever arm (82) is arranged vertically upward, and the inner side thereof is installed with a main span bridge deck handrail (87).

3. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 1, characterized in that: The side span single-sided suspension main beam (9) is made of a large cantilever steel-concrete composite beam cross-section. The side span single-sided suspension main beam (9) comprises a hollow side span transverse steel structure large cantilever arm (92) extending along one side of the side span central steel box beam (91), a side span vertical anchor arm (98) arranged upward along the other side of the side span central steel box beam (91), side span shear bolts (95) are welded between the upper flange of the side span central steel box beam (91) and the upper flange of the side span transverse steel structure large cantilever arm (92), the upper surface of the side span shear bolts (95) is covered and connected with a side span reinforced concrete bridge deck (94), a side span transverse water collection slope (96) is arranged along the surface of the side span reinforced concrete bridge deck (94), a side span inclined cable ear plate (93) is arranged on the top of the side span central steel box beam (91), and one side of the main span transverse steel structure large cantilever arm (82) is arranged vertically upward, and a side span bridge deck handrail (97) is installed on the inner side thereof.

4. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 3, characterized in that: The side span cable lug (93) is connected to the bottom of the side span cable (7); the upper surface of the side span transverse water collection slope (96) is inclined downward along the side span transverse steel structure cantilever (92) to the side span central steel box girder (91); and the surface of the side span transverse water collection slope (96) located at the top of the side span central steel box girder (91) protrudes upward, and the height of the protrusion is lower than the surface of the side span transverse water collection slope (96) on the side away from the side span central steel box girder (91).

5. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 2, characterized in that: The width of the bridge deck of the main span main beam (8) is (3-8) m, the beam height of the main span central steel box beam (81) is (1 / 120-1 / 80) of the span of the main span main beam (8), the flange plate thickness of the main span central steel box beam (81) is (20-30) mm, the web plate thickness of the main span central steel box beam (81) is preferably (14-20) mm, the thickness of the main span reinforced concrete bridge deck (84) is (100-150) mm, the main span reinforced concrete bridge deck (84) is made of self-compacting concrete with a concrete strength not less than C40, and the longitudinal bridge direction spacing of the main span transverse steel structure large cantilever (82) is (1.5-2.5) m.

6. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 2, characterized in that: Two connection ports are respectively branched at both ends of the main span main beam (8), the span of the main span main beam (8) is (50-200) m, a main span transverse water collection slope (86) is provided at the main span inclined cable ear plate (83), the top of the main span transverse water collection slope (86) is convex, and both sides of the top convex are concave downward, and the heights of both ends of the main span transverse water collection slope (86) are higher than both sides of the top convex, and the main span inclined cable ear plate (83) is connected to the main span inclined cable (6).

7. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 1, characterized in that: The upper facade of the steel shell structure bridge tower (5) is inclined in the direction of the main span main beam (8) at an angle of (15-25) degrees. The steel shell structure bridge tower (5) is made of a steel shell concrete structure, and the concrete is self-compacting concrete with a strength not less than C35. The thickness of the steel plate of the steel shell structure bridge tower (5) is (20-40) mm, and the thickness of the plate at the connection node with the compression rod inclined leg (11) is 40 mm. The steel shell structure bridge tower (5) uses a 20 mm thick steel plate within a length range where the steel plate section changes less. The width of the steel shell structure bridge tower (5) is 1 / 50 of the span of the main span main beam (8).

8. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 1, characterized in that: The root of the steel shell structure bridge tower (5) is fixedly connected to the compression rod inclined leg (11) by means of prestressed anchor bolts and PBL steel-concrete connection keys. The steel shell structure bridge tower (5) is connected to the main span inclined cable (6) and the side span inclined cable (7) by means of fork ear anchors. The consolidation point at the intersection of the steel shell structure bridge tower (5) and the main span main beam (8) is connected by a steel structure. The top anchor point of the steel shell structure bridge tower (5) is the center of the arc line of the side span single-side suspended main beam (9) whose axis is an arc line on the plane.

9. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 1, characterized in that: The main span cable (6) and the side span cable (7) are made of fully enclosed high-vanadium cables, the anchor cable distance on the beam of the side span cable (7) is (4-12) m, and the ear plate perforated plugs at the top of the main span cable (6) and the side span cable (7) are welded to the flange of the steel shell structure bridge tower (5).

10. The T-shaped asymmetric single-tower cable-stayed pedestrian bridge combined with a viewing platform according to claim 1, characterized in that: The beam end pier (12) has three legs, and the three legs are respectively located on the main beams in three different directions: the main span main beam (8), the A3 connection port (3), and the A4 connection port (4). The safety factor of the ground anchor cable of the ground anchor rod (10) is greater than 3.0.

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