Combined bridge tower and construction method of super-large span pedestrian landscape curved cable-stayed bridge

Abstract

In response to the demand for ultra-large-span pedestrian landscape curved cable-stayed bridges, the portal tower structure of the traditional cable-stayed bridge is reformed, and the single-leaf hyperboloid bridge tower body, sightseeing tower cap, bowl-shaped thin-walled shell skirt and circular sightseeing platform plate form a combined bridge tower for ultra-large-span pedestrian landscape curved cable-stayed bridge. The bowl-shaped thin-walled shell skirt and the single-leaf hyperboloid bridge tower form a tube-in-tube structure, which has strong torsion resistance, ensuring that the curved cable-stayed bridge tower structure bears huge unbalanced torsional internal forces and avoids the failure of the bridge tower support rotation. The single-leaf hyperboloid bridge tower body and the sightseeing tower cap form a sightseeing tower-type bridge tower structure. The curved cable-stayed bridge tower and the sightseeing tower are combined into one, sharing the foundation and saving construction costs. The large-scale single-leaf hyperboloid cylindrical bridge tower structure has strong lateral stiffness, which can reduce the cable-tower-beam coupling vibration during the cantilever casting construction of the curved cable-stayed bridge, and can reduce the mid-span deflection deformation under live load.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering, and relates to a construction technology of a cable-stayed bridge tower structure, and in particular to a combined tower and a construction method of an ultra-large-span pedestrian landscape curved cable-stayed bridge. Background Art

[0002] Curved bridges have a special aesthetic appeal. Building curved bridges in lake parks or wetland parks can coordinate with the ecological environment of the scenic area and make it convenient for tourists to enjoy the beautiful scenery along the way.

[0003] When the span of a curved beam bridge across a river is large, the beam bridge encounters considerable difficulties in structure and construction. It would be very appropriate to use a large-span curved cable-stayed bridge.

[0004] As early as 1977, Chinese American Lin Tongyan proposed the design of the American Ruck Bridge curved cable-stayed bridge, which won many international awards. The ultra-large span curved cable-stayed bridge structure itself complements the environment, with beautiful shape and fascinating scenery.

[0005] The super-large span curved cable-stayed bridge is a combination of a curved main beam and a cable-stayed bridge. It has a complex structure. The curved main beam has to withstand the combined effects of bending moment, shear force and torque at the same time. Its bridge tower structure is subjected to huge unbalanced torsional internal forces, which leads to the failure of the bridge tower support rotation. The cable design, calculation and analysis are difficult, which makes it very difficult to control the internal force balance during the construction phase.

[0006] To this day, there is still no ultra-large span curved cable-stayed bridge in the world. The Ruck Bridge has become the most famous unbuilt bridge in the world. There are many reasons for this, the main one being that there is no reliable rigid bridge tower structure. The cable-tower-beam of the curved cable-stayed bridge produces coupled vibrations, making the cantilever assembly construction control of the post-tensioned spatial cable-stayed cable surface very difficult.

[0007] The river in the wetland park is winding, and there are many islands in the water in the lake view park. We can use the small islands in the water to build a large-scale cylindrical rigid cable-stayed bridge tower structure. In line with the park's scenic environment, we can build an ultra-large-span pedestrian landscape curved cable-stayed bridge. People are looking forward to it.

[0008] In response to the demand for ultra-large span pedestrian landscape curved cable-stayed bridges, the portal tower structure of the traditional cable-stayed bridge is reformed, and a combined tower structure system for a curved cable-stayed bridge is formed by combining a single-leaf hyperbolic tower body, an observation tower cap, a bowl-shaped thin-walled shell podium and a circular observation platform plate structure.

[0009] The bowl-shaped thin-walled shell podium and the single-leaf hyperbolic bridge tower body form a tube-in-tube structure. The tube-in-tube structure has strong torsion resistance and can ensure that it can bear the huge unbalanced torsional internal force of the curved cable-stayed bridge tower and avoid the rotation failure of the bridge tower support.

[0010] The single-leaf hyperbolic bridge tower body and the sightseeing tower cap form a sightseeing tower-type bridge tower structure. The cable-stayed bridge tower and the sightseeing tower are combined into one, sharing the foundation and saving construction costs.

[0011] The large-scale single-leaf hyperbolic cylindrical rigid bridge tower structure is used to reliably anchor the spatial cable-stayed cable network and reduce the coupled vibration of the cable-tower-beam of the curved cable-stayed bridge. This can ensure the stability and safety requirements of the cantilever casting curved stiffening beam bridge deck construction stage until the curved cable-stayed bridge is assembled and closed.

[0012] A bowl-shaped thin-walled shell podium is built at the bottom of the single-leaf hyperbolic sightseeing tower bridge to facilitate tourists to enter the sightseeing bridge tower; a circular sightseeing platform is set on the top of the bowl-shaped thin-walled shell podium, and the curved bridge deck and the circular sightseeing platform are connected, which ensures smooth traffic; the side piers of the pedestrian landscape curved cable-stayed bridge adopt single-leaf hyperbolic variable-section single-column hollow piers with beautiful shapes; the bridge deck of the pedestrian landscape curved cable-stayed bridge is equipped with flower beds, seats and other architectural pieces, and trees are planted, which is ecological and environmentally friendly. Summary of the invention

[0013] Technical issues: The combined bridge tower structural system consists of four parts: a single-leaf hyperbolic bridge tower body, a sightseeing tower cap, a bowl-shaped thin-walled shell podium and a circular sightseeing platform plate structure. The bottom of the curved cable-stayed bridge combined bridge tower forms a tube-in-tube structural system. The tube-in-tube structure has strong torsion resistance, which can avoid the rotation failure of the cable-stayed bridge tower bearings. In addition, the sightseeing tower-style bridge tower and the curved cable-stayed bridge tower are combined into one, sharing the foundation and saving construction costs.

[0014] Technical solution: The combined bridge tower of a super-large-span pedestrian landscape curved cable-stayed bridge of the present invention comprises a cable-stayed bridge combined bridge tower structure system, a curved stiffening beam, a spatial cable-stayed cable net, a single-leaf hyperboloid variable-section single-column cable-stayed bridge side pier and a bridge deck flower bed, characterized in that the cable-stayed bridge combined bridge tower structure system is composed of a single-leaf hyperboloid bridge tower body, a sightseeing tower cap, a bowl-shaped thin-walled shell skirt and a circular sightseeing platform plate structure. The sightseeing tower cap is arranged on the top of the single-leaf hyperboloid bridge tower body, and the single-leaf hyperboloid bridge tower body is placed in the bowl-shaped thin-walled shell skirt. A circular sightseeing platform plate structure is arranged on the top of the bowl-shaped thin-walled shell podium, which is firmly connected to the single-leaf hyperbolic bridge tower body at the inner ring. One end of the spatial cable-stayed net is anchored to the upper position of the single-leaf hyperbolic bridge tower body, and the other end of the spatial cable-stayed net obliquely pulls the curved stiffening beam. One end of the curved stiffening beam is connected to the circular sightseeing platform plate structure, and the other end of the curved stiffening beam is placed on the side pier of the single-leaf hyperbolic variable-section single-column cable-stayed bridge. A bridge deck flower bed is arranged on the curved stiffening beam to plant flowers and plants, which is ecological and environmentally friendly.

[0015] Preferably, the single-leaf hyperbolic bridge tower body is a single-leaf hyperbolic steel tube concrete thin-walled cylinder structure, with multiple reinforced concrete diaphragms arranged inside and a circular elevator arranged at the center.

[0016] Preferably, the bowl-shaped thin-walled shell podium is a bowl-shaped structure composed of a lower cylindrical thin-walled shell and an upper rotation curved thin-walled shell, a plurality of circular reinforced concrete diaphragms are arranged inside, a giant reinforced concrete ring beam structure is arranged at the bowl mouth of the bowl-shaped thin-walled shell podium, and a circular sightseeing platform plate structure serves as the top cover of the bowl-shaped thin-walled shell podium.

[0017] A construction method for a combined bridge tower of a super-long-span pedestrian landscape curved cable-stayed bridge of the present invention is characterized in that the method comprises the following steps:

[0018] Step 1: According to the topography of the wetland park or lake view park, select the bridge site, carry out pile foundation construction, carry out single-leaf hyperbolic bridge tower body construction, install the sightseeing tower cap, and form the cable-stayed bridge tower column structure;

[0019] Step 2: Carry out the construction of the bowl-shaped thin-walled shell podium and the circular sightseeing platform plate structure to form a cable-stayed bridge combined tower structure system;

[0020] Step 3: Carry out the construction of the approach bridge, the construction of the hyperboloid variable cross-section single-column cable-stayed bridge side piers and the auxiliary piers of the cable-stayed bridge;

[0021] Step 4: Anchor the spatial cable-stayed net at the upper part of the single-leaf hyperbolic bridge tower body, and use the cantilever casting method to cantilever reinforced concrete curved stiffening beams on site until the bridge deck is closed;

[0022] Step 5: Carry out bridge deck paving construction, install bridge deck flower beds and other architectural pieces, plant flowers and plants, and form an ecological bridge deck;

[0023] Step 6: Carry out interior decoration of the observation tower, install elevators, railings and street lights, form an ultra-large span pedestrian landscape curved cable-stayed bridge, and put it into operation.

[0024] The cable-stayed bridge tower structure and the sightseeing tower structure are two-in-one, with complementary functions. The sightseeing tower structure, as the tower structure of the cable-stayed bridge, enhances the aesthetic effect of the pedestrian landscape bridge, facilitates tourists to appreciate the beautiful scenery of the scenic area from high altitude, and increases the cultural connotation of the pedestrian landscape cable-stayed bridge.

[0025] The bowl-shaped thin-walled shell podium and the single-leaf hyperbolic bridge tower form a tube-in-tube structure. The tube-in-tube structure has strong torsion resistance and can ensure that it can bear the huge unbalanced torsional internal force of the curved cable-stayed bridge tower structure and avoid the rotation failure of the bridge tower support.

[0026] The single-leaf hyperbolic bridge tower body and the sightseeing tower cap form a sightseeing tower-type bridge tower structure. The curved cable-stayed bridge tower and the sightseeing tower are combined into one. The cable-stayed bridge and the sightseeing tower share the foundation and tower body, saving construction costs.

[0027] The large-scale single-leaf hyperbolic cylindrical bridge tower structure has strong lateral stiffness, which can reduce the coupled vibration of cable-tower-beam during the cantilever casting construction of curved cable-stayed bridges, reduce the bending and torsional effects of ultra-large span curved cable-stayed bridges, and reduce the mid-span deflection deformation under live loads.

[0028] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0029] The structure of super-large span curved cable-stayed bridge is complex. The curved main beam has to bear the combined effects of bending moment, shear force and torque at the same time. The bending and torsion effect is obvious. The cable design, calculation and analysis are difficult. The internal force balance control during the construction phase is very difficult. The structural stiffness of the cable-stayed bridge tower has a huge impact on the stress performance of the super-large span curved cable-stayed bridge.

[0030] There is a huge difference between the tower structures of curved cable-stayed bridges and straight cable-stayed bridges. The straight cable-stayed bridge is a simple tower structure subjected to two-dimensional forces, while the tower structure of the curved cable-stayed bridge is a complex tower structure subjected to three-dimensional forces. The tower structure of the curved cable-stayed bridge is subject to huge unbalanced torsional internal forces, just like the twisting "bottle cap" phenomenon, which will cause the tower support to fail to rotate.

[0031] The portal tower structure of a traditional cable-stayed bridge has a single function. The tower structure of a portal cable-stayed bridge is connected to the curved deck stiffening beam by a simple consolidation connection. The tower structure of a portal cable-stayed bridge cannot bear the combined internal forces of huge bending moment and torque transmitted from the curved stiffening beam deck. Therefore, to this day, there is still no large-span curved cable-stayed bridge in the world, and it is necessary to reform and innovate the tower structure of ultra-large-span curved cable-stayed bridges.

[0032] As we all know, the closed cylindrical structure has good torsion resistance, and the tube-in-tube structure can withstand huge torque. The bottom of the curved cable-stayed bridge should adopt a strong tube-in-tube structure to avoid rotational failure of the tower bearings of the curved cable-stayed bridge.

[0033] The four parts of a single-leaf hyperbolic tower body, an observation tower cap, a bowl-shaped thin-walled shell podium and a circular observation platform plate constitute a combined tower structure system for a curved cable-stayed bridge. The use of a combined tower structure for an ultra-large span curved cable-stayed bridge can ensure the tower-beam consolidation connection effect of the curved cable-stayed bridge. The combined tower structure can bear the composite internal force of huge bending moment and torque transmitted from the curved stiffening beam bridge deck.

[0034] Among them, the single-leaf hyperbolic bridge tower body, the bowl-shaped thin-walled shell podium structure at the bottom of the tower and the circular sightseeing platform plate structure form a tube-in-tube structure. The huge tube-in-tube structure at the bottom of the tower has a strong torsional resistance, which can resist the huge torque internal force transmitted from the curved stiffening beam bridge deck, and ensure that the curved stiffening beam bridge deck will not torsionally deform at the curved cable-stayed bridge support, thereby ensuring the tower-beam consolidation effect at the intersection of the curved stiffening beam bridge deck and the combined bridge tower structure.

[0035] Among them, the large-scale single-leaf hyperbolic sightseeing tower structure has greater lateral stiffness. The cable-stayed cable is anchored on the upper part of the single-leaf hyperbolic sightseeing tower with huge lateral stiffness. The cable-stayed cable lifts the curved stiffened beam bridge deck. The large-scale single-leaf hyperbolic thin-walled shell of the rigid cable-stayed bridge tower can reduce the coupled vibration of the cable-tower-beam of the curved cable-stayed bridge, reduce the bending and torsional effects of the super-large span curved cable-stayed bridge, reduce the mid-span deflection deformation under the action of live load, facilitate the tensioning construction control of the cable-stayed cable, and facilitate the bridge line shape control of the curved cable-stayed bridge.

[0036] Among them, the single-leaf hyperbolic bridge tower body and the sightseeing tower cap form a sightseeing tower-type bridge tower structure, the curved cable-stayed bridge tower and the sightseeing tower are combined into one, and the curved cable-stayed bridge and the sightseeing tower share the same tower body and foundation, saving the construction investment of the wetland park or lake view park, with significant economic benefits.

[0037] The sightseeing tower and the curved cable-stayed bridge are two-in-one, with complementary functions, novel shapes, and rich facades, which enhance the aesthetic effect of the pedestrian landscape bridge. A sightseeing restaurant cap is set on the top of the single-leaf hyperbolic bridge tower, which allows tourists to appreciate the beautiful scenery of the scenic park, thus achieving a balance between aesthetic requirements, transportation functions, and sightseeing functions.

[0038] A variety of curved elements are introduced, including the single-leaf hyperbolic shaped slim waist sightseeing tower structure, the curved box girder bridge deck, the giant bowl-shaped thin-walled shell skirt at the bottom of the tower, and the single-leaf hyperbolic shaped variable-section single-column cable-stayed bridge piers. The four curved structures complement each other and present the beauty and grace of the curved configuration.

[0039] A circular platform is set at the single-leaf hyperbolic sightseeing tower-style bridge tower. The curved bridge deck is connected to the circular sightseeing platform, and the traffic organization is smooth.

[0040] Flower beds, seats and other leisure architectural pieces are placed on the bridge deck of the pedestrian landscape curved cable-stayed bridge, and flowers and plants are planted, which is ecological and environmentally friendly and increases the cultural connotation of the pedestrian landscape curved cable-stayed bridge.

[0041] According to the design concept of ecological landscape bridge, a single-leaf hyperbolic sightseeing tower is built in the wetland park or lake park scenic area, with a sightseeing restaurant cap on the top of the tower. At the bottom of the tower, a bowl-shaped thin-walled shell skirt structure is constructed, and a circular sightseeing platform plate structure is constructed on the top of the bowl-shaped thin-walled shell to form a curved cable-stayed bridge combined tower structure. The tower body of the single-leaf hyperbolic sightseeing tower is installed with cable-stayed cables, and the curved box girder stiffening beam is constructed by cantilever casting until the bridge deck is closed, and architectural pieces such as flower beds on the bridge deck are installed, and flowers and plants are planted to form a super-large-span pedestrian landscape curved cable-stayed bridge with a single-leaf hyperbolic bridge tower.

[0042] The combined bridge tower of the super-large span pedestrian landscape curved cable-stayed bridge has the advantages of reasonable force structure, strong torsion resistance, large lateral stiffness, beautiful curve shape, rich facades, strong landscape, ecological protection, smooth traffic organization, convenient construction and good cost performance. It is suitable for the construction of super-large span pedestrian landscape curved cable-stayed bridges with iconic themes in wetland parks or lake view parks. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a three-dimensional schematic diagram of a combined bridge tower of a super-large span pedestrian landscape curved cable-stayed bridge;

[0044] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the cable-stayed bridge composite tower structure system;

[0045] Figure 3 yes Figure 2 3D schematic diagram of the bowl-shaped thin-walled shell podium;

[0046] Figure 4 yes Figure 2 A three-dimensional schematic diagram of the single-leaf hyperbolic bridge tower body and the observation tower cap;

[0047] Figure 5 It is a schematic diagram of the geometric configuration of a single-leaf hyperboloid;

[0048] Figure 6 It is a three-dimensional schematic diagram of the side pier of a single-leaf hyperbolic variable-section single-column cable-stayed bridge.

[0049] The figure includes: a cable-stayed bridge combined tower structure system 1; a single-leaf hyperbolic bridge tower body 11; an observation tower cap 12; a bowl-shaped thin-walled shell podium 13; a circular ring-shaped observation platform plate structure 14; a curved stiffening beam 2; a spatial cable-stayed cable net 3; a single-leaf hyperbolic variable-section single-column cable-stayed bridge side pier 4; a cable-stayed bridge auxiliary pier 5; and a bridge deck flower bed 6. DETAILED DESCRIPTION

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] Embodiment 1:

[0052] The invention discloses a combined bridge tower of a super-large-span pedestrian landscape curved cable-stayed bridge, comprising a cable-stayed bridge combined bridge tower structure system 1, a curved stiffening beam 2, a spatial cable-stayed cable net 3, a single-leaf hyperboloid variable-section single-column cable-stayed bridge side pier 4 and a bridge deck flower bed 6, characterized in that: the cable-stayed bridge combined bridge tower structure system 1 is composed of a single-leaf hyperboloid bridge tower body 11, a sightseeing tower cap 12, a bowl-shaped thin-wall shell skirt 13 and a circular ring-shaped sightseeing platform plate structure 14. The sightseeing tower cap 12 is arranged on the top of the single-leaf hyperboloid bridge tower body 11, the single-leaf hyperboloid bridge tower body 11 is placed in the bowl-shaped thin-wall shell skirt 13, and the bowl-shaped A circular sightseeing platform plate structure 14 is arranged on the top of the thin-walled shell podium 13, and the circular sightseeing platform plate structure 14 is firmly connected with the single-leaf hyperbolic bridge tower body 11 at the inner ring. One end of the spatial inclined cable net 3 is anchored to the upper position of the single-leaf hyperbolic bridge tower body 11, and the other end of the spatial inclined cable net 3 obliquely pulls the curved stiffening beam 2, one end of the curved stiffening beam 2 is connected to the circular sightseeing platform plate structure 14, and the other end of the curved stiffening beam 2 is placed on the side pier 4 of the single-leaf hyperbolic variable-section single-column cable-stayed bridge, and a bridge deck flower bed 6 is arranged on the curved stiffening beam 2 to plant flowers and plants, which is ecological and environmentally friendly.

[0053] The single-leaf hyperbolic bridge tower body 11 is a single-leaf hyperbolic steel tube concrete thin-walled cylinder structure, with multiple reinforced concrete diaphragms arranged inside and a circular elevator arranged at the center.

[0054] The bowl-shaped thin-walled shell skirt 13 is a bowl-shaped structure composed of a cylindrical thin-walled shell at the bottom and a rotating curved thin-walled shell at the top, wherein a plurality of circular reinforced concrete diaphragms are arranged inside, a giant reinforced concrete ring beam structure is arranged at the bowl mouth of the bowl-shaped thin-walled shell skirt 13, and a circular sightseeing platform plate structure 14 serves as the top cover of the bowl-shaped thin-walled shell skirt 13.

[0055] Embodiment 2:

[0056] A construction method for a combined bridge tower of a super-long-span pedestrian landscape curved cable-stayed bridge of the present invention is characterized in that the method comprises the following steps:

[0057] Step 1: According to the topography of the wetland park or lake view park, a bridge site is selected, pile foundation construction is carried out, a single-leaf hyperbolic bridge tower body 11 is constructed, and a sightseeing tower cap 12 is installed to form a cable-stayed bridge tower column structure;

[0058] Step 2: construct the bowl-shaped thin-wall shell podium 13 and the circular sightseeing platform plate structure 14 to form a cable-stayed bridge combined tower structure system 1;

[0059] Step 3: Carry out the construction of the approach bridge, and carry out the construction of the hyperboloid-shaped variable-section single-column cable-stayed bridge side pier 4 and the cable-stayed bridge auxiliary pier 5;

[0060] Step 4: Anchor the spatial cable-stayed net 3 at the upper position of the single-leaf hyperbolic bridge tower body 11, and use the cantilever casting method to cantilever the reinforced concrete curved stiffening beam 2 on site until the bridge deck is closed;

[0061] Step 5: Carry out bridge deck paving construction, install bridge deck flower beds 6 and other architectural pieces, plant flowers and plants, and form an ecological bridge deck;

[0062] Step 6: Carry out interior decoration of the observation tower, install elevators, railings and street lights, form an ultra-large span pedestrian landscape curved cable-stayed bridge, and put it into operation.

[0063] Embodiment 3:

[0064] For a landscape bridge in a lake park, the owner put forward two requirements: a curved landscape bridge and a sightseeing tower-style cable-stayed bridge tower. Therefore, the new technology of a pedestrian landscape curved cable-stayed bridge with a single-leaf hyperbolic sightseeing bridge tower was adopted.

[0065] The span of the super-large-span pedestrian landscape curved cable-stayed bridge in Lakeview Park is 2×150 meters. The bridge tower adopts a single-leaf hyperbolic sightseeing tower-style bridge tower structure, the bridge deck structure adopts a curved concrete box girder structure, and the side piers of the cable-stayed bridge adopt single-leaf hyperbolic variable-section single-column hollow piers.

[0066] The single-leaf hyperbolic sightseeing cable-stayed bridge tower is 110 meters high. The sightseeing tower bridge tower structure consists of three parts: the sightseeing tower body, the sightseeing tower cap and the bowl-shaped thin-walled shell skirt at the bottom of the tower. The sightseeing tower body is a 90-meter-high single-leaf hyperbolic cylindrical structure, and the sightseeing tower cap is a 20-meter-high steel structure shell-shaped tower top.

[0067] The diameter of the variable-section single-leaf hyperbolic sightseeing tower is 10 to 20 meters. The thinnest waist of the tower is 60 meters above the ground. The tower wall is 400mm thick. It adopts a reinforced concrete structure and is cast with C50 concrete. There are multiple reinforced concrete partitions inside and a circular sightseeing elevator inside.

[0068] The bowl-shaped thin-walled shell podium at the bottom of the tower adopts a reinforced concrete bowl-shaped thin-walled shell structure with a wall thickness of 300mm and is cast with C40 concrete. The diameter of the bowl mouth is 50 meters, the diameter of the bowl bottom is 30 meters, and the total height of the bowl-shaped podium is 15 meters. A reinforced concrete ring beam is set at the bowl mouth, and the cross-sectional size of the ring beam is 400×2000mm.

[0069] The curved bridge deck adopts a single-box double-chamber concrete box girder structure. The bridge deck width is 16 meters and the box girder height is 2 meters. The top plate, bottom plate and vertical plate of the concrete box girder are all 300mm thick. A 200m thick concrete partition is set at intervals of 15 meters. C40 concrete is used for pouring. The curved box girder stiffening plate of the cable-stayed bridge is fixedly connected to the single-leaf hyperbolic sightseeing cable-stayed bridge tower.

[0070] A circular sightseeing platform is set around the single-leaf hyperbolic bridge tower. The circular sightseeing platform adopts a reinforced concrete box structure. Twelve radial reinforced concrete diaphragms are evenly arranged in the circular sightseeing platform plate. The cross-sectional size of the diaphragm is 300×2000mm. The two ends of the diaphragm are respectively placed on the bowl-shaped thin-walled shell skirt at the bottom of the tower and the single-leaf hyperbolic bridge tower structure. An annular diaphragm is set in the circular box girder of the sightseeing platform. The cross-sectional size of the annular diaphragm is 250×2000mm. The top and bottom plates of the circular box girder sightseeing platform are 300mm thick and are cast with C40 concrete.

[0071] The side piers of the cable-stayed bridge adopt single-leaf hyperbolic variable-section reinforced concrete single-column hollow piers. The side pier is 15 meters high, and the elliptical cross-section size of the tower body is 6 meters in major axis and 3 meters in minor axis to 12 meters in major axis and 6 meters in minor axis. The wall thickness of the single-leaf hyperbolic hollow pier is 250mm, and it is cast with C40 concrete. The thinnest waist is 5 meters from the ground. The top of the pier body is the largest, and two left and right bridge supports are set on the top of the pier body.

[0072] The steel cables of the curved cable-stayed bridge in this design are high-strength steel cables with a diameter of 0.15m. The cable spacing is 15 meters, with a total of 2 spans × 2 × 8 pairs of steel cables. The parallel steel cables are made of φ5.2mm high-strength steel wire with a strength of 1670MPa.

[0073] In order to improve the structural integrity and structural rigidity of the long-span curved cable-stayed bridge and to reduce the bending and torsional effects of the long-span curved cable-stayed bridge, auxiliary piers of the cable-stayed bridge are set on the east side of the main bridge collapse of the curved cable-stayed bridge. The auxiliary piers of the cable-stayed bridge are 45 meters away from the east side piers of the cable-stayed bridge, and the cross-sectional dimensions of the auxiliary piers of the cable-stayed bridge are the same as those of the side piers of the cable-stayed bridge.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A combined bridge tower of a super-large-span pedestrian landscape curved cable-stayed bridge, comprising a cable-stayed bridge combined bridge tower structural system (1), a curved stiffening beam (2) and a spatial cable-stayed cable net (3), characterized in that: The cable-stayed bridge combined tower structure system (1) is composed of four parts: a single-leaf hyperboloid bridge tower body (11), a sightseeing tower cap (12), a bowl-shaped thin-wall shell skirt (13), and a circular ring-shaped sightseeing platform plate structure (14). The sightseeing tower cap (12) is arranged on the top of the single-leaf hyperboloid bridge tower body (11), the single-leaf hyperboloid bridge tower body (11) is placed in the bowl-shaped thin-wall shell skirt (13), the circular ring-shaped sightseeing platform plate structure (14) is arranged on the top of the bowl-shaped thin-wall shell skirt (13), and the circular ring-shaped sightseeing platform plate structure (14) is arranged on the top of the bowl-shaped thin-wall shell skirt (13). The shaped sightseeing platform plate structure (14) is connected to the single-leaf hyperboloid bridge tower body (11) at the inner ring, one end of the spatial inclined cable net (3) is anchored to the upper position of the single-leaf hyperboloid bridge tower body (11), the other end of the spatial inclined cable net (3) obliquely pulls the curved stiffening beam (2), one end of the curved stiffening beam (2) is connected to the circular ring-shaped sightseeing platform plate structure (14), and the other end of the curved stiffening beam (2) is placed on the single-leaf hyperboloid variable-section single-column cable-stayed bridge side pier (4); The single-leaf hyperboloid bridge tower body (11) is a single-leaf hyperboloid steel tube concrete thin-walled cylinder structure, with multiple reinforced concrete diaphragms arranged inside, and a circular elevator arranged at the center thereof; The bowl-shaped thin-walled shell skirt (13) is a bowl-shaped structure composed of a cylindrical thin-walled shell at the bottom and a rotating curved thin-walled shell at the top, wherein a plurality of circular reinforced concrete diaphragms are arranged inside the bowl-shaped thin-walled shell skirt (13), a giant reinforced concrete ring beam structure is arranged at the mouth of the bowl-shaped thin-walled shell skirt (13), and a circular sightseeing platform plate structure (14) serves as a top cover of the bowl-shaped thin-walled shell skirt (13).

2. A construction method for constructing a combined bridge tower of a super-long-span pedestrian landscape curved cable-stayed bridge according to claim 1, characterized in that: The method comprises the following steps: The first step: according to the topography of the wetland park or the lake view park, a bridge site is selected, pile foundation construction is performed, a single-leaf hyperbolic bridge tower body (11) is constructed, and a sightseeing tower cap (12) is installed to form a cable-stayed bridge tower column structure; Step 2: constructing a bowl-shaped thin-wall shell podium (13) and a circular sightseeing platform plate structure (14) to form a cable-stayed bridge combined tower structure system (1); Step 3: Construction of the approach bridge, construction of the hyperboloid variable cross-section single-column cable-stayed bridge side pier (4) and the cable-stayed bridge auxiliary pier (5); Step 4: anchoring the spatial cable-stayed net (3) at the upper position of the single-leaf hyperbolic bridge tower body (11), and using the cantilever casting method to cantilever the reinforced concrete curved stiffening beam (2) on site until the bridge deck is closed; Step 5: Carry out bridge deck paving construction, install bridge deck flower beds (6), plant flowers and plants, and form an ecological bridge deck; Step 6: Carry out interior decoration of the observation tower, install elevators, railings and street lights, form an ultra-large span pedestrian landscape curved cable-stayed bridge, and put it into operation.

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