CN110820526A - Spatial four-cable-plane double-amplitude curved cable-stayed bridge for canyon river terrain and construction method - Google Patents

Spatial four-cable-plane double-amplitude curved cable-stayed bridge for canyon river terrain and construction method Download PDF

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Publication number
CN110820526A
CN110820526A CN201911059504.XA CN201911059504A CN110820526A CN 110820526 A CN110820526 A CN 110820526A CN 201911059504 A CN201911059504 A CN 201911059504A CN 110820526 A CN110820526 A CN 110820526A
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cable
bridge
double
shaped
arc
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CN110820526B (en
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徐文平
陈凯
戴航
戴捷
陈岳
郑纪研
夏叶飞
丁敬
焦安亮
李今保
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Southeast University
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Southeast University
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D11/00Suspension or cable-stayed bridges
    • E01D11/04Cable-stayed bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D11/00Suspension or cable-stayed bridges
    • E01D11/02Suspension bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/12Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • E01D19/125Grating or flooring for bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/14Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • E01D2101/26Concrete reinforced
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/30Metal

Abstract

The invention provides a space four-cable-surface double-amplitude curved cable-stayed bridge of a canyon river topography and a construction method thereof. The double-bent cable-stayed bridge has the advantages of simple structure, rich vertical surface, attractive appearance, ecological environmental protection, smooth traffic organization, convenience in construction, good economy and the like, and has a good application prospect.

Description

Spatial four-cable-plane double-amplitude curved cable-stayed bridge for canyon river terrain and construction method
Technical Field
The invention relates to a cable-stayed bridge and construction thereof, in particular to a spatial four-cable-plane double-amplitude curved cable-stayed bridge of a canyon river terrain and a construction method thereof.
Background
With the progress of times, main structures of a main tower, a main beam, a stay cable and the like of a cable-stayed bridge are changed, wherein the cable-stayed bridge with the main beam in a curve shape, namely a bent inclined cable-stayed bridge, is appeared in order to adapt to the linear shape of a route. Under the condition of canyon river terrain, a high-grade highway is usually designed in a parallel river mode, and if a bridge across rivers is in a curved beam bridge structure, favorable conditions can be created for road route selection, and extremely reasonable and economical results are brought. When the span of the river-crossing curved beam bridge is large, the general beam bridge is difficult in structure and construction, and the large-span curved cable-stayed bridge is very suitable, so that the special advantages of the structural form of the bridge can be fully exerted and displayed, and the bridge has a special and attractive appearance in aesthetics. As early as 1977, the american national forest company proposed a design scheme for curved cable-stayed bridges (Ruck bridge), however, until today, curved cable-stayed bridges with large spans have not been built in the world for a number of reasons, mainly as follows: the Ruck bridge is formed by combining a curved main beam and a cable-stayed bridge, has a complex structure, the curved main beam needs to bear the combined action of bending moment, shearing force and torque, the design, calculation and analysis of a cable rope are difficult, and the internal force balance control difficulty in the construction stage is very high; the Ruck bridge cable-stayed cables are dispersedly anchored on the hillside, the construction is complex, and the later maintenance is quite difficult; due to the horizontal arch structure effect, the horizontal component force of the Ruck bridge cable causes the curve type main beam to have large horizontal support counterforce at the foundation, the original design has no special technical treatment measures, the stress of the foundation structure is unbalanced, and the bridge support slides and deforms; the Ruck bridge is a single-curve bent bridge, and the automobile vehicle turns on the bridge, only the return road running route of the automobile at the upstream of the river is considered, the automobile running route in the direction of the downstream reservoir is not considered, and the use functionality of the bridge is not strong.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a spatial four-cable-plane double-amplitude curved cable-stayed bridge in a gorge river terrain, and solves the problems that the basic acceptance of the cable-stayed bridge is unbalanced, a bridge support is easy to slip and deform, and the service function is not strong.
The technical scheme is as follows: the spatial four-cable-surface double-amplitude curved cable-stayed bridge of the gorge river terrain comprises two arched bridge towers, an elliptical annular double-amplitude curved main beam and an elliptical ring beam, wherein the elliptical annular double-amplitude curved main beam is arranged between the two arched bridge towers, the elliptical ring beam is arranged in the elliptical annular double-amplitude curved main beam, a four-cable-surface spatial cable-stayed net is arranged between the arched bridge towers and the elliptical annular double-amplitude curved main beam, an oblique back cable-stayed net is arranged between the outer sides of the arched bridge towers and the ground, the arched bridge towers are fixed through suspension cables, and the suspension cables are fixed with the elliptical ring beam through radial suspension cables.
The arched bridge tower consists of a parabolic segment tower top and a left elliptic arc segment tower column and a right elliptic arc segment tower column.
The four-cable-surface space cable-stayed net comprises an inner cable-stayed net and an outer cable-stayed net, one end of the inner cable-stayed net is anchored at the top section of a parabolic section of the arch bridge tower, the other end of the inner cable-stayed net adopts a cross anchoring mode to tightly suspend the inner sides of the left bridge floor and the right bridge floor of the elliptic annular double-amplitude curved main beam, one end of the outer cable-stayed net is anchored at the top section of a tower column of the arch bridge tower, and the other end of the outer cable-stayed net tightly suspends the outer sides of the left bridge floor and the right bridge floor of the.
One end of the oblique back guy cable net is dispersedly anchored on the arch bridge tower, and the other end is divided into a left part and a right part which are intensively anchored in the ground anchorage.
The oval ring form double amplitude curve type girder include oval arc bridge floor section, connect transition bridge floor section, the board and original road section are encorbelmented to the arc, two oval arc beam section tails intersect in connecting transition bridge floor section about oval arc bridge floor section, connect transition bridge floor section inverse circular arc curve and control original road section and be connected, the tip of connecting transition bridge floor section sets up the arc board of encorbelmenting, the tight mountain slope body in arc board top of encorbelmenting, the central department of oval ring form double amplitude curve type girder sets up oval ring beam supporting member.
The invention relates to a construction method of a spatial four-cable-plane double-amplitude curved cable-stayed bridge of a canyon river terrain, which comprises the following steps of:
(S1) selecting bridge sites of the double-amplitude curved cable-stayed bridge on two sides of the canyon river according to geological topography and landform condition requirements, excavating foundation pits on a hilly body, and constructing a tunnel type anchorage and a bridge tower foundation of the cable-stayed bridge;
(S2) in a prefabricating factory, manufacturing a parabolic segment tower top and a left elliptic arc segment tower column and a right elliptic arc segment tower column by adopting a fire bending process, transporting to a site, welding, assembling and forming, and pouring concrete into a steel pipe to form an arched bridge tower;
(S3) installing oblique back guy cable nets on the duck egg arch bridge towers in a scattered manner, wherein the oblique back guy cable nets are divided into a left part and a right part, the other ends of the left part and the right part are intensively anchored in the anchors, and single main cable suspension cables are hung between the tops of the two arch bridge towers;
(S4) constructing a connecting transition bridge deck section of a double-bending cable-stayed bridge as an upper turning traveling platform of the vehicle bridge on two sides of the canyon river, connecting the left side and the right side of the connecting transition bridge deck section with the original road sections, arranging an arc-shaped cantilever plate at the end part of the connecting transition bridge deck section, pushing a hill body by the arc-shaped cantilever plate in an embedded method, and connecting the left elliptic arc-shaped bridge deck section (21) and the right elliptic arc-shaped bridge deck section with the connecting transition bridge deck section to form an elliptic ring-shaped double-amplitude curved main beam;
(S5) anchoring the inner side cable net to the top section of the parabolic segment tower of the arch-shaped bridge tower, and anchoring the outer side cable net to the top section of the elliptic arc segment tower column of the duck egg arch-shaped bridge tower (1) to form a four-cable-plane space cable-stayed cable net;
(S6) sequentially dividing the arch bridge tower into four space cable mesh surface anchoring sections of the stay cables, assembling and constructing a left elliptic arc bridge deck section by using cantilevers of the first and third space cable mesh surfaces, assembling and constructing a right elliptic arc bridge deck section by using cantilevers of the second and fourth space cable mesh surfaces, and arranging two inner cable meshes in a crossed manner;
(S7) in the construction process of assembling the cantilevers of the elliptic ring-shaped double-amplitude curved main girder segments, a plurality of temporary connecting beam structures are arranged between a left arc-shaped bridge deck section and a right arc-shaped bridge deck section (21), a single main cable suspension cable is used for arranging a temporary suspension cable to tightly suspend the temporary connecting beam structures, and a cable hoisting construction method is used for assisting the cantilevers to assemble the left elliptic arc-shaped bridge deck section and the right elliptic arc-shaped bridge deck section (21) of the double-amplitude curved cable-stayed bridge until the bridge deck is assembled and folded;
(S8) utilizing single main cable suspension cables to install radial suspension cables at the central position of the elliptical ring-shaped double-amplitude curved main beam, hanging and installing an elliptical ring beam, supporting and tightly propping the inner bridge floor of the left and right elliptical arc bridge floor sections of the elliptical ring-shaped double-amplitude curved main beam by the elliptical ring beam, and using the elliptical ring beam as a sightseeing platform;
(S9) installing railings and street lamps, paving an asphalt concrete pavement, and constructing the oversized span double-bent cable-stayed bridge of the canyon river topography.
Has the advantages that: the invention adopts the elliptical ring-shaped double-amplitude curved main beam, the bridge deck structure is bilaterally symmetrical, when the cantilever is assembled and constructed, the bridge deck structure can basically eliminate the torsional internal force, the bridge deck is provided with the cantilever plate to tightly push the hillside body, the internal force of the support is balanced, and the bidirectional traffic organization is smooth. The central point of the oval annular double-amplitude curved main beam is provided with the oval ring beam, the left and right beam structures of the oval annular double-amplitude curved main beam are tightly propped, the integrity of the bridge deck structure is enhanced, the opposite horizontal deformation of the left and right beam structures under the action of a space stay cable surface can be prevented, the stress safety of the bridge deck structure can be ensured, the oval ring beam is also used as a sightseeing platform, the landscape effect is improved, two purposes are achieved at one stroke, the bridge has the advantages of simple structure, rich vertical face, attractive appearance, ecological environmental protection, smooth traffic organization, convenience in construction, good economical efficiency and the like, and the application prospect is good.
Drawings
FIG. 1 is a three-dimensional schematic view of a spatial four-plane double-amplitude curved cable-stayed bridge of a canyon river terrain;
FIG. 2 is a three-dimensional schematic view of the arch-shaped pylon of the duck egg of FIG. 1;
FIG. 3 is a three-dimensional schematic view of the elliptical ring-shaped double-amplitude curved main beam of FIG. 1;
FIG. 4 is a three-dimensional schematic view of the curved surface net of the four-plane space stay cable of FIG. 1;
fig. 5 is a schematic view of the tieback structure of fig. 1.
Wherein, the arch bridge tower 1; a parabolic segment tower top 11; an elliptical arc segment tower 12; an elliptical ring-shaped double-amplitude curved main beam 2; an elliptical arc deck section 21; connecting the transition deck sections 22; an arc-shaped cantilever plate 23; the original road section 24; an elliptical ring beam 3; a four-cable-plane space stayed cable net 4; an inner dragline net 41; an outboard guy wire net 42; an oblique back guy wire net 5; an anchorage 6; a suspension cable 7; a sling 8.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1-5, a spatial four-cable-side double-amplitude curved cable-stayed bridge in a valley river topography comprises a duck egg arch bridge tower 1, an elliptical ring-shaped double-amplitude curved main beam 2, a central elliptical ring beam 3, a four-cable-side spatial cable-stayed net 4, a back stay cable 5, an anchor 6, a single main cable suspension cable 7, a sling 8 and the like, and is characterized in that: the duck egg arch-shaped bridge tower 1 consists of a parabolic segment tower top 11 and a left elliptic arc segment tower column and a right elliptic arc segment tower column 12, and the duck egg arch-shaped bridge tower 1 is arranged on hills at two banks; the elliptical ring-shaped double-amplitude curved main beam 2 is placed on two banks of a canyon river, the elliptical ring-shaped double-amplitude curved main beam 2 is connected with an original road, an elliptical ring beam 3 is arranged in the center of the elliptical ring-shaped double-amplitude curved main beam 2, and the elliptical ring beam 3 supports the inner waist parts of the left and right curved beam bodies of the elliptical ring-shaped double-amplitude curved main beam 2; the four-cable-surface space stayed cable net 4 consists of an inner cable net 41 and an outer cable net 42, the inner cable net 41 is anchored at the top 11 section of the parabolic segment tower of the duck egg arch bridge tower 1, the left and right groups of inner cable nets 41 adopt a cross anchoring mode to tightly suspend the inner sides of the left and right bridge surfaces of the elliptic annular double-amplitude curved main beam 2, the outer cable net 42 is anchored at the top section of the elliptic arc segment tower column 12 of the duck egg arch bridge tower 1, and the left and right groups of outer cable nets 42 adopt a principle of proximity to tightly suspend the outer sides of the left and right bridge surfaces of the elliptic annular double-amplitude curved main beam 2; one end of the oblique back guy cable net 5 is dispersedly anchored on the duck egg arch bridge tower 1, and the other end is divided into a left part and a right part which are intensively anchored in the anchorage 6; the single main cable suspension cable 7 is suspended between the tops of the two duck egg arch-shaped bridge towers 1, radial suspension cables 8 are arranged on the single main cable suspension cable 7, and the oval ring beam 3 is suspended by the radial suspension cables 8 in the center of the bridge.
The elliptical ring-shaped double-amplitude curved main beam 2 is composed of an elliptical arc-shaped bridge deck section 21, a connecting transition bridge deck section 22, an arc-shaped cantilever plate 23 and an original road section 24, the tails of the left elliptical arc-shaped beam section and the right elliptical arc-shaped beam section of the elliptical arc-shaped bridge deck section 21 intersect with the connecting transition bridge deck section 22, the connecting transition bridge deck section 22 serves as a vehicle bridge upper turning traveling platform, an inverted arc-shaped curve of the connecting transition bridge deck section 22 is connected with the left original road section 24 and the right original road section 24, the arc-shaped cantilever plate 23 is arranged at the end part of the connecting transition bridge deck section 22, the arc-shaped cantilever plate 23 tightly supports a hill slope body, and an elliptical ring-shaped 3 supporting member is arranged at the center of the elliptical.
The invention is constructed by the following steps:
the first step is as follows: on two sides of a valley river, according to the requirements of geological topography and landform conditions, selecting bridge sites of the double-amplitude curved cable-stayed bridge, excavating a foundation pit on a hilly body, and constructing a tunnel type anchorage 6 and a bridge tower foundation of the cable-stayed bridge;
the second step is that: in a prefabrication factory, a firer bending process is adopted to manufacture a parabolic segment tower top 11 and a left elliptic arc segment tower column and a right elliptic arc segment tower column 12, the parabolic segment tower top and the left elliptic arc segment tower column and the right elliptic arc segment tower column are transported to a site, welded, assembled and formed, concrete is filled in a steel pipe, and the duck egg arch bridge tower 1 is formed;
the third step: oblique back guy cable nets 5 are dispersedly installed on the duck egg arch-shaped bridge towers 1, the oblique back guy cable nets 5 are divided into a left part and a right part, the other ends of the left part and the right part are intensively anchored in anchors 6, and single main cable suspension cables 7 are hung between the tower tops of the two duck egg arch-shaped bridge towers 1;
the fourth step: on both sides of the valley river, constructing a connecting transition bridge deck section 22 of a double-bending cable-stayed bridge as an upper bending driving platform of the vehicle bridge, connecting the left side and the right side of the connecting transition bridge deck section 22 with an original road section 24, arranging an arc-shaped cantilever plate 23 at the end part of the connecting transition bridge deck section 22, propping a hillside body by the arc-shaped cantilever plate 23 by adopting an embedded method, and connecting the left elliptic arc-shaped bridge deck section 21 and the right elliptic arc-shaped bridge deck section 21 with the connecting transition bridge deck section 22 to form an elliptic ring-shaped double-amplitude curved main beam 2;
the fifth step: the inner side inhaul cable net 41 is anchored at the top section 11 of the parabolic segment tower top of the duck egg arch bridge tower 1, and the outer side inhaul cable net 42 is anchored at the top section of the elliptic arc segment tower column 12 of the duck egg arch bridge tower 1 to form a four-cable-plane space inhaul cable net 4;
and a sixth step: the duck egg arched bridge tower 1 is sequentially divided into four stay cable space cable net surface anchoring sections, a left elliptic arc-shaped bridge deck section 21 is assembled and constructed by a first space cable net surface cantilever and a third space cable net surface cantilever, a right elliptic arc-shaped bridge deck section 21 is assembled and constructed by a second space cable net surface cantilever and a fourth space cable net surface cantilever, and two inner stay cable nets 41 are arranged in a crossed mode;
the seventh step: in the assembling construction process of 2 sections of the elliptic annular double-amplitude curved main beam, a plurality of temporary connecting beam structures are arranged between a left arc-shaped bridge deck section and a right arc-shaped bridge deck section 21, a single main cable suspension cable 7 is used for arranging a temporary suspension cable to tightly suspend the temporary connecting beam structures, and a cable hoisting construction method is used for assisting a cantilever to assemble the left elliptic arc-shaped bridge deck section and the right elliptic arc-shaped bridge deck section 21 of the double-bending cable-stayed bridge until the bridge decks are assembled and folded;
eighth step: at the central position of the elliptical ring-shaped double-amplitude curved main beam 2, a single main cable suspension cable 7 is utilized to install radial suspension cables 8, an elliptical ring beam 3 is suspended and installed, the elliptical ring beam 3 supports and tightly supports the inner bridge surfaces of the left and right elliptical arc bridge surface sections 21 of the elliptical ring-shaped double-amplitude curved main beam 2, and the elliptical ring beam 3 is also used as a sightseeing platform;
the ninth step: installing handrails and street lamps, paving an asphalt concrete pavement, building an ultra-large span double-bend cable-stayed bridge of a canyon river topography, and running.
When the method is adopted, two high-grade highways with parallel rivers are already built on two banks of a certain canyon river terrain, the design load is the second grade of the highways, the width of the rivers is 400 meters, and the river-crossing cable-stayed bridge needs to be built at present. On the slopes on two banks, duck egg arch-shaped bridge towers are constructed, the distance between the two duck egg arch-shaped bridge towers is 500 meters, each duck egg arch-shaped bridge tower consists of a parabolic segment tower top and a left elliptic arc segment tower column and a right elliptic arc segment tower column, the height of each duck egg arch-shaped bridge tower is 170 meters, the widest part of each bridge tower is 130 meters, the width of the parabolic segment tower top is 100 meters, the rise of each parabolic segment tower top is 20 meters, the height of each elliptic arc segment tower column is 150 meters, each egg arch-shaped bridge tower is a circular steel pipe with the diameter of 10 meters, the wall thickness of each steel pipe is 40mm, and C60 concrete is poured into each egg arch. The elliptic circular double-amplitude curved main beam consists of an elliptic arc-shaped bridge deck section, a connecting transition bridge deck section and an arc-shaped cantilever plate, wherein the elliptic arc-shaped bridge deck section is a single-box double-chamber corrugated steel web curve combined box beam, the beam height is 3 meters, and the width of the double-amplitude bridge deck is 10 meters; the connecting transition bridge deck section adopts a reinforced concrete thick plate structure, and the thickness of the plate is 3 meters; the arc-shaped cantilever plate is a reinforced concrete plate with the thickness of 0.4 m, and the arc-shaped cantilever plate is embedded in a tight mountain slope body; an elliptical ring beam is arranged in the center of the elliptical ring-shaped double-amplitude curved main beam, supports the inner bridge deck of the left and right elliptical arc-shaped bridge deck sections of the elliptical ring-shaped double-amplitude curved main beam, and is also used as a sightseeing platform, the elliptical ring beam is in a common steel box girder structure, the height of the elliptical ring beam is 2.5 meters, and the width of the elliptical ring beam is 5 meters. The four-cable-surface space stay cable is divided into four areas and anchored on a duck egg arch bridge tower, the four-cable-surface space stay cable net is composed of an inner side stay cable net and an outer side stay cable net, the inner side stay cable net is anchored on a top section of a parabolic segment tower of the duck egg arch bridge tower, the outer side stay cable net is anchored on a top section of an elliptic arc segment tower column of the duck egg arch bridge tower, the inner side stay cable net adopts a cross anchoring mode, the distance between bridge deck anchoring points of cables of the four-cable-surface space stay cable net is 15 meters, the diameter of the stay cable is linearly changed from the end part of a beam to a midspan position of the beam from 0.2 to 0.25 meter, one end of the oblique back stay cable net is dispersedly anchored on the duck egg arch bridge tower, and the other end of the oblique back stay cable net is. The single main cable suspension cable is arranged between the two duck egg arch bridge towers, the diameter of the single main cable suspension cable is 0.6 m, the high-strength steel wire finished cable is used, in the construction stage, the steel truss type connecting beam is suspended, a similar arch bridge cable hoisting method is adopted, the auxiliary cantilever is used for assembling the elliptical ring-shaped double-amplitude curved main beam, the hoisting stress balance is ensured, and the bridge deck beam is prevented from torsion deformation in the assembling process; and after the bridge is formed, the temporary connecting beam is removed, the single main cable suspension cable is provided with radial suspension cables, the suspension cables are provided with 12 high-strength steel wire cables in total, the diameter of each cable is 0.1 meter, and the central part of the suspension is provided with an oval ring beam. Installing handrails and street lamps, paving an asphalt concrete pavement to build an ultra-large span double-bent inclined bridge of a canyon river topography, and enabling the vehicle to be used for traffic operation.
The invention constructs a large-span curved cable-stayed bridge structure under the gorge river terrain, vehicles turn on the bridge, the difficulty of changing the line of the highway in the mountainous area is avoided, a large number of stone engineering or tunnel construction can be avoided, the investment is saved, the stability of the mountain is protected, the ecological environment is protected, the vertical surface of the curved cable-stayed bridge structure is rich, and the shape is beautiful. By adopting the elliptical ring-shaped double-amplitude curved main beam, the bridge deck structure is bilaterally symmetrical, when the cantilever is assembled and constructed, the torsional internal force of the bridge deck structure can be basically eliminated, the bridge deck is provided with the cantilever plate to tightly push a hill body, the internal force of the support is balanced, and the bidirectional traffic organization is smooth. The oval ring beam is arranged at the center of the circular double-amplitude curved main beam and tightly props against the left and right beam structures of the circular double-amplitude curved main beam, so that the integrity of the bridge deck structure is enhanced, the horizontal deformation of the left and right beam structures in opposite directions under the action of the space stay cable surface can be prevented, the stress safety of the bridge deck structure can be ensured, the oval ring beam is also used as a sightseeing platform, the landscape effect is improved, and two purposes are achieved. According to the invention, by arranging the curved duck egg arch bridge tower, the spatial curved surface cable-stayed cable net is dispersedly anchored on the duck egg arch bridge tower, the cable-stayed bridge back cable can be divided into a left cable and a right cable which are intensively anchored in the two anchors, the structure stress is reliable, the curved duck egg arch bridge tower and the spatial curved surface cable-stayed cable net are matched with each other, the complement each other is achieved, and the unique and novel beauty of the spatial structure is embodied. The spatial curved surface cable-stayed four-cable-surface net is dispersedly anchored on the duck egg arch bridge tower, the inner side cable net is anchored on the top section of the parabolic segment tower of the duck egg arch bridge tower, the outer side cable net is anchored on the top section of the elliptical arc segment tower column of the duck egg arch bridge tower, and the spatial curved surface cable-stayed cable net is beautiful in shape; the duck egg arched bridge tower is divided into four sections in sequence, the space cables of two cable surfaces of the left curved main beam anchor the first section and the third section of the duck egg arched bridge tower, the space cables of two cable surfaces of the right curved main beam anchor the second section and the fourth section of the duck egg arched bridge tower, two space cable nets on the inner side are arranged in a crossed mode, the space curved surface cable-stayed four cable surface nets are arranged in an optimized mode, the stress path is guaranteed to be smooth, and the bridge deck static air is guaranteed to meet requirements. A single main cable suspension cable is arranged between two duck egg arch bridge towers, a temporary connecting beam structure is hoisted by the single main cable suspension cable in a construction stage and is connected with a left and a right double-amplitude curved beams, a cable hoisting method is adopted to assist assembly construction of double-bent cable-stayed bridge cantilevers, and after a bridge is formed, the single main cable suspension cable is provided with a radial sling to hoist an oval ring beam, so that two purposes are achieved by one crane.
The automobile turns on the double-bend cable-stayed bridge, the driving routes of the vehicles passing through the river in two directions on two banks are smooth, and the symmetrical double-bend main beams can greatly reduce the torque of the main beam structure; arranging a duck egg arch bridge tower, anchoring space cables of four cable surfaces of a double-bent cable-stayed bridge on the duck egg arch bridge tower, dividing cable-stayed back cables of the duck egg arch bridge tower into a left group and a right group, and intensively anchoring the cable-stayed back cables in two tunnel type anchors; the tail part of the double-amplitude annular curve main beam is provided with an arc-shaped cantilever plate, the arc-shaped cantilever plate tightly props up a hill body, and the tension of a space oblique cable of the double-bend cable-stayed bridge to the double-bend cable-stayed bridge main beam is balanced. The novel double-bent cable-stayed bridge has the advantages of simple structure, rich vertical surface, attractive appearance, ecological environmental protection, smooth traffic organization, convenience in construction, good economy and the like, and has a good application prospect.

Claims (6)

1. The utility model provides a four cable face double amplitude curve type cable-stay bridges in space of canyon river topography, a serial communication port, includes two arch pylons (1), oval annular double amplitude curve type girder (2) and oval ring beam (3), oval annular double amplitude curve type girder (2) set up between two arch pylons (1), oval ring beam (3) set up in oval annular double amplitude curve type girder (2), be provided with four cable face space cable-stay nets (4) between arch pylon (1) and oval annular double amplitude curve type girder (2), be provided with slant back of the body cable-stay net (5) between arch pylon (1) outside and the ground, it is fixed through span wire (7) between arch pylon (1), span wire (7) are fixed through radial hoist cable (8) and oval ring beam (3).
2. The spatial four-plane double-amplitude curved cable-stayed bridge of canyon river terrain according to claim 1, characterized in that the arch-shaped bridge tower (1) is composed of a parabolic segment tower top (11) and two left and right elliptic arc segment tower columns (12).
3. The spatial four-cable-surface double-amplitude curved cable-stayed bridge of the canyon river terrain according to claim 1, wherein the four-cable-surface spatial cable-stayed net (4) comprises an inner cable net (41) and an outer cable net (42), one end of the inner cable net (41) is anchored at a parabolic section tower top section of the arch bridge tower (1), the other end of the inner cable net adopts a cross anchoring mode to hoist the inner sides of the left and right bridge floors of the elliptical ring-shaped double-amplitude curved main beam (2), one end of the outer cable net (42) is anchored at a top section of a tower column of the arch bridge tower (1), and the other end of the outer cable net hoists the outer sides of the left and right bridge floors of the elliptical ring-shaped double-amplitude curved main beam (2).
4. The spatial four-cable-side double-amplitude curved cable-stayed bridge of the canyon river terrain according to claim 1, wherein one end of the oblique back guy cable net (5) is dispersedly anchored on the arch bridge tower (1), and the other end is divided into a left part and a right part which are intensively anchored in a ground anchorage.
5. The spatial four-cable-surface double-amplitude curved cable-stayed bridge of the canyon river terrain according to claim 1, wherein the elliptical ring-shaped double-amplitude curved main beam (2) comprises an elliptical arc-shaped bridge deck section (21), a connecting transition deck section (22), an arc-shaped cantilever plate (23) and an original road section (24), the tails of the left and right elliptical arc-shaped beam sections of the elliptical arc-shaped bridge deck section (21) are intersected with the connecting transition deck section (22), the inverted arc-shaped curve of the connecting transition deck section (22) is connected with the left and right original road sections (24), the arc-shaped cantilever plate (23) is arranged at the end part of the connecting transition deck section (22), the arc-shaped cantilever plate (23) tightly supports a mountain slope body, and the elliptical ring-shaped double-amplitude curved main beam (2) is provided with an elliptical ring beam (3) supporting member at the center.
6. The method of constructing a spatial four-plane double-span curved cable-stayed bridge in a canyon river terrain according to claim 1, comprising the steps of:
(S1) selecting bridge sites of the double-amplitude curved cable-stayed bridge on two sides of the canyon river according to geological topography and landform condition requirements, excavating foundation pits on a hilly body, and constructing a tunnel type anchorage (6) of the cable-stayed bridge and a bridge tower foundation;
(S2) manufacturing a parabolic segment tower top (11) and a left elliptic arc segment tower column and a right elliptic arc segment tower column (12) by adopting a fire bending process in a prefabricating factory, transporting to a site, welding, assembling and forming, and pouring concrete into a steel pipe to form the arched bridge tower (1);
(S3) installing oblique back guy cable nets (5) on the duck egg arch bridge towers (1) in a scattered manner, dividing the oblique back guy cable nets (5) into a left part and a right part, intensively anchoring the other ends of the left part and the right part in anchor anchors (6), and hanging single main cable suspension cables (7) between the tower tops of the two arch bridge towers (1);
(S4) on two sides of a canyon river, constructing a connecting transition bridge deck section (22) of a double-bending cable-stayed bridge to serve as an upper turning traveling platform of a vehicle bridge, connecting the left side and the right side of the connecting transition bridge deck section (22) with an original road section (24), arranging an arc-shaped cantilever plate (23) at the end part of the connecting transition bridge deck section (22), jacking a hillside body by the arc-shaped cantilever plate (23) by adopting an embedded method, and connecting the left elliptic arc-shaped bridge deck section (21) and the right elliptic arc-shaped bridge deck section (21) with the connecting transition bridge deck section (22) to form a circular elliptic double-amplitude curved main beam (2;
(S5) anchoring the inner guy cable net (41) to the top section of the parabolic segment tower top (11) of the arch bridge tower (1), and anchoring the outer guy cable net (42) to the top section of the elliptic arc segment tower column (12) of the duck egg arch bridge tower (1) to form a four-cable-plane space guy cable net (4);
(S6) sequentially dividing the arch bridge tower (1) into four space cable mesh surface anchoring sections of stay cables, assembling and constructing a left elliptic arc-shaped bridge deck section (21) by using cantilevers of a first space cable mesh surface and a third space cable mesh surface, assembling and constructing a right elliptic arc-shaped bridge deck section (21) by using cantilevers of a second space cable mesh surface and a fourth space cable mesh surface, and arranging two inner stay cable meshes (41) in a crossed manner;
(S7) in the construction process of assembling the sections of the elliptic annular double-amplitude curved main girder (2) by cantilevers, arranging a plurality of temporary connecting beam structures between a left circular-arc bridge deck section and a right circular-arc bridge deck section (21), arranging temporary slings by using single main cable suspension ropes (7), and tightly hoisting the temporary connecting beam structures, wherein the construction method of hoisting cables is used for assisting the cantilevers to assemble the left elliptic-arc bridge deck section and the right elliptic-arc bridge deck section (21) of the double-amplitude curved cable-stayed bridge until the bridge decks are assembled and folded;
(S8) installing radial suspension ropes (8) at the central position of the elliptical ring-shaped double-amplitude curved main beam (2) by using single main cable suspension ropes (7), hanging and installing an elliptical ring beam (3), supporting and tightly propping against the inner side bridge surface of the left and right elliptical arc bridge surface sections (21) of the elliptical ring-shaped double-amplitude curved main beam (2) by the elliptical ring beam (3), and using the elliptical ring beam (3) as a sightseeing platform;
(S9) installing railings and street lamps, paving an asphalt concrete pavement, and constructing the oversized span double-bent cable-stayed bridge of the canyon river topography.
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