CN219490643U - Multi-tower asymmetric low-tower cable-stayed bridge structure - Google Patents
Multi-tower asymmetric low-tower cable-stayed bridge structure Download PDFInfo
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- CN219490643U CN219490643U CN202320390841.2U CN202320390841U CN219490643U CN 219490643 U CN219490643 U CN 219490643U CN 202320390841 U CN202320390841 U CN 202320390841U CN 219490643 U CN219490643 U CN 219490643U
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Abstract
The utility model discloses a multi-tower asymmetric low-tower cable-stayed bridge structure. The multi-tower short-tower cable-stayed bridge is a long connection structure, and the structure temperature effect is large; the existing symmetrical structure causes engineering investment waste. The utility model comprises a side span, a main span and a bridge tower, wherein the steel truss girder is fixedly connected with the bottom of the bridge tower; the top surfaces of the main pier, the auxiliary pier and the connecting pier are provided with supports, a main pier transverse bridge at the center position is provided with a longitudinal and transverse fixed support to one side, the other side is provided with a longitudinal fixed support, and other bridge piers are provided with a longitudinal movable support and a longitudinal and transverse movable support; dampers are arranged on the two sides of the support along the bridge direction; the bridge towers are arranged at unequal heights, the large hole spans a high bridge tower, the small hole spans a low bridge tower, and the number of stay cables is matched with the height of the bridge tower. According to the utility model, the bridge pier at the position where the longitudinal fixing support is arranged bears the longitudinal additional force such as braking force, and the girder at other bridge piers can freely stretch longitudinally, so that the problem that the long-span and large-span asymmetric structure causes large bending moment of the bridge tower due to the temperature effect is solved.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering, and particularly relates to a multi-tower asymmetric low-tower cable-stayed bridge structure.
Background
The short-tower cable-stayed bridge is also called a partial cable-stayed bridge, is a cable-stayed combined system bridge type between a continuous beam bridge and a cable-stayed bridge, has the advantages of high main beam rigidity, strong spanning capability, simple construction, good economy, attractive appearance and the like, and has stronger competitiveness in a bridge type scheme with a main span of 200-300 m, a long-connected structure and limited tower height.
The multi-tower short-tower cable-stayed bridge is of a long-connected structure, and has the problems of large structure temperature effect, difficult structure foundation design, outstanding earthquake resistance and the like; the main spans of the multi-tower low-tower cable-stayed bridge built at present are symmetrical and equally-span arranged, but are influenced by boundary conditions such as flood control and navigation, if symmetrical and equally-span arrangement is adopted, the small main span needs to be consistent with the most-controlled large main span, the height of the bridge tower corresponding to the small main span needs to be consistent with the height of the bridge tower corresponding to the most-controlled large main span, the bridge span and the bridge tower height are uniformly increased, the length of the main bridge is increased, the hole span arrangement is inflexible and not free, engineering investment waste or the bridge span and the bridge tower height are not matched, the structural stress is unreasonable, and the economical efficiency and the applicability of the bridge are greatly reduced.
Disclosure of Invention
In order to make up the defects of the prior art, the utility model provides a multi-tower asymmetric low-tower cable-stayed bridge structure, which aims to solve the problems of large temperature effect, difficult basic design, difficult earthquake resistance and fortification, negative counter force of a secondary main pier and difficult symmetric and equal span arrangement hole spans under the complex boundary control condition of the multi-tower asymmetric low-tower cable-stayed bridge structure.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
multi-tower asymmetric low-tower cable-stayed bridge structure is characterized in that: the bridge tower comprises side spans, a main span and a bridge tower, wherein the steel truss girder is fixedly connected with the bottom of the bridge tower; one end of the stay cable is fixedly connected with the bridge tower, and the other end of the stay cable is fixedly connected with the steel truss girder;
the lower part of the steel truss girder is provided with a main pier, an auxiliary pier and a connecting pier, a bearing platform is arranged below the main pier, the auxiliary pier and the connecting pier, and a foundation is arranged below the bearing platform;
the top surfaces of the main pier, the auxiliary pier and the connecting pier are provided with supports, a main pier transverse bridge at the center position is provided with a longitudinal and transverse fixed support to one side, the other side is provided with a longitudinal fixed support, and other bridge piers are provided with a longitudinal movable support and a longitudinal and transverse movable support;
the two sides of the support are provided with dampers along the bridge direction, the tops of the dampers are fixedly connected with the steel truss beams, and the bottoms of the dampers are fixedly connected with the top surface of the pier.
Further, the included angle between the damper and the center of the support is 45 degrees;
further, the steel truss girder comprises an upper layer bridge deck structure and a lower layer bridge deck structure, two main trusses are arranged in the transverse bridge direction, and the upper layer bridge deck structure, the lower layer bridge deck structure and the main trusses are fixedly connected through a transverse cross brace, a transverse diagonal bracing, a diagonal bracing and a suspender;
further, the upper deck structure of the standard section of the steel truss girder is an orthotropic steel deck, and the upper deck structure of the weight pressing section is a steel truss concrete combined deck; the middle driving area of the lower deck structure is an orthotropic rigid deck, and bridge panels at two sides of the driving area are hollow structures;
further, the side spans and the main spans are arranged in an asymmetric span mode;
further, bridge towers are arranged at unequal heights, a high bridge tower is arranged across a large hole, and a low bridge tower is arranged across a small hole;
further, the number of the stay cables is matched with the height of the bridge tower, and the high bridge tower is provided with more stay cables, and the low bridge tower is provided with less stay cables.
The utility model has the beneficial effects that:
1) According to the utility model, a structural system of tower beam consolidation and tower pier separation is adopted, the bridge pier at the position where the longitudinal fixed support is arranged bears longitudinal additional forces such as braking force, and the main beams at other bridge piers can freely stretch longitudinally, so that the technical problem that the long-span and large-span asymmetric structure causes large bending moment of the bridge tower due to the temperature effect is solved, and meanwhile, the horizontal force and the longitudinal bending moment of the foundation are smaller, so that the engineering quantity of the lower foundation can be greatly reduced;
2) The bridge piers of the asymmetric low-tower cable-stayed bridge are provided with the dampers, the dampers and the main beams are obliquely arranged at 45 degrees, under the action of an earthquake, the longitudinal and transverse fixed supports are sheared to form movable supports, the dampers play a role, and the earthquake response of the longitudinal bridge and the transverse bridge of the multi-tower low-tower cable-stayed bridge serving as the long-joint large-span can be reduced simultaneously;
3) According to the utility model, the steel truss concrete combined bridge deck is adopted to carry out weight pressing within a range of a certain length of a large mileage side span, so that the structural stress and the weight pressing are combined, the occurrence of negative counter force on the secondary main pier of the asymmetric low-tower cable-stayed bridge is avoided, and the durability of the bridge structure is effectively improved;
4) According to the asymmetric low-tower cable-stayed bridge, the hole spans are reasonably arranged according to actual boundary conditions, the tradition that the multi-tower low-tower cable-stayed bridge adopts symmetrical span arrangement is broken, the span arrangement is free, the requirements of navigation and flood control are met more easily, the phenomenon of enlarging the hole spans for realizing the symmetrical arrangement is avoided, and the engineering cost is saved;
5) The multi-tower asymmetric low-tower cable-stayed bridge has the characteristics of large span high tower, small span low tower, gao Daduo cable, low tower and few cable, has staggered structure and reasonable stress, maximally utilizes the material properties of the bridge tower and the cable, saves engineering materials and has good economy;
6) The multi-tower asymmetric low-tower cable-stayed bridge is characterized in that a low-tower bridge tower is arranged close to the airport side when the multi-tower asymmetric low-tower cable-stayed bridge is built near the airport, a high-tower bridge tower is arranged far away from the airport side, and the high-low-tower bridge tower well utilizes the aviation height limitation of a slope.
Drawings
FIG. 1 is a schematic diagram of an elevation layout of a multi-pylon asymmetric low-pylon cable-stayed bridge in an embodiment;
FIG. 2 is a schematic illustration of an elevation arrangement of a mount and damper in an embodiment;
FIG. 3 is a schematic plan view of a mount and damper in an embodiment;
FIG. 4 is a schematic cross-sectional view of a standard Duan Gang truss in an embodiment;
FIG. 5 is a schematic cross-sectional view of an embodiment of a medium-pressure heavy section steel truss;
in the figure, 1, side span; 2. a main span; 3. a bridge tower; 4. stay cables; 5. steel truss girder; 6. a connecting pier; 7. an auxiliary pier; 8. a main pier; 9. bearing platform; 10. a foundation; 11. a main truss; 12. an upper deck structure; 13. a lower deck structure; 14. a cross-linked cross brace; 15. a cross diagonal bracing; 16. diagonal bracing; 17. a boom; 18. orthotropic steel deck; 19. steel truss concrete is combined with a bridge deck; 20 supports; 21. a damper; 22. a longitudinal and transverse fixing support; 23. a longitudinal fixed support; 24. a longitudinal movable support; 25. and the longitudinal and transverse movable supports.
Detailed Description
The present utility model will be described in detail with reference to the following embodiments.
As shown in fig. 1, the embodiment provides a multi-tower asymmetric low-tower cable-stayed bridge structure, which comprises a side span 1, a main span 2, a bridge tower 3 and stay ropes 4, wherein a steel truss girder 5 is fixedly connected with the bottom of the bridge tower 3, a main pier 8, an auxiliary pier 7 and a connecting pier 6 are arranged at the lower part of the steel truss girder 5, the connecting pier 6 is positioned at the starting point and the end point of the multi-tower asymmetric low-tower cable-stayed bridge, the main pier 8 is a pier at the position of the bridge tower 3, and the auxiliary pier 7 is a pier between the connecting pier 6 and the main pier 8; the bearing platform 9 is positioned below the pier. The foundation 10 is positioned below the bearing platform 9; as shown in fig. 2 and 3, the present embodiment further includes a support 20 and a damper 21, the support 20 is disposed on top surfaces of the connecting pier 6, the auxiliary pier 7 and the main pier 8, the main pier 8 at the center position is laterally bridged to one side with a longitudinal and lateral fixed support 22, the other side with a longitudinal and lateral fixed support 23, and the other piers are provided with a longitudinal movable support 24 and a longitudinal and lateral movable support 25. The structural system that the bridge tower 3 is fixedly connected with the steel truss girder 5 and the bridge tower 3 is separated from the bridge piers is adopted, the bridge piers at the longitudinal and transverse fixed support 22 bear longitudinal additional forces such as braking force, and the longitudinal bridge directions of the steel truss girder 5 at other bridge piers can freely stretch out and draw back, so that the technical problem that the long-span and large-span asymmetric structure causes large bending moment of the bridge tower due to the temperature effect is solved, and the horizontal force and the longitudinal bending moment of the foundation 10 are smaller, so that the engineering quantity of the lower foundation 10 can be greatly reduced;
the dampers 21 are positioned on two sides of the support 20 along the bridge direction, the top of the dampers is connected with the steel truss 5, and the bottom of the dampers is connected with the top surface of the pier; the damper 21 has the functions of reducing the displacement of the cable-stayed bridge in the transverse bridge direction and the longitudinal bridge direction under the action of loads such as earthquake and the like, absorbing consumed energy and reducing the stress of the bridge pier; the dampers 21 are obliquely arranged at 45 degrees, so that the earthquake response of the cable-stayed bridge in the transverse bridge direction and the longitudinal bridge direction can be reduced simultaneously.
As shown in fig. 4 and 5, in this embodiment, the steel truss girder 5 adopts a scheme that an upper deck structure 12 and a lower deck structure 13 have the same width, and the transverse bridge direction adopts two main trusses 11; the main truss 11, the upper deck structure 12 and the lower deck structure 13 are connected through a cross brace 14, a cross brace diagonal brace 15, a diagonal brace 16 and a suspender 17; the upper deck structure 12 is a six-lane primary road, and the lower deck structure 13 is a ballasted double-line railway; in order to prevent negative reaction of the support 20 in the normal use state of the multi-tower asymmetric low-tower cable-stayed bridge, the durability of the bridge structure is effectively improved, and the steel truss concrete combined bridge deck 19 is adopted to carry out weight in a certain length range of the large mileage side span 1, so that the structural stress and the weight are combined; the standard section steel truss upper layer bridge deck structure 12 adopts an orthotropic steel bridge deck 18, the weight section steel truss upper layer bridge deck structure 12 adopts steel truss concrete to combine with a bridge deck 19, the middle driving area of the lower layer bridge deck structure 13 adopts an orthotropic rigid bridge deck 18, and bridge panels on two sides of the driving area are hollowed out. The cross section main truss 11 has the advantages of simple structure, direct force transmission and convenient erection, meets the width requirements of two sections of a road and a railway, has higher section efficiency, and realizes the integration of the road and the railway at bridge sites.
According to the flood control and navigation requirements, the traditional scheme that the multi-tower short-tower cable-stayed bridge adopts symmetrical span arrangement is broken through, the side span 1 and the main span 2 are both arranged in an asymmetrical span mode, and the small mileage side span 1 is set to be L 1 +L 2 The large mileage side span 1 span is set as L 2 ’+L 1 ', wherein L 1 ≠L 1 ’，L 2 ≠L 2 ' Main stride 2 adopts L 3 +L 4 +L 3 ' span arrangement, wherein L 3 ≠L 3 'A'; the main spans 2 of the side spans 1 are arranged in an asymmetric span mode, so that the requirements of complex boundary control conditions are met, andthe bridge construction cost is reduced.
The embodiment is closer to an airport runway, is positioned in an airplane take-off climbing plane, gradually increases from a small mileage side to a large mileage side airport control elevation, and adopts unequal height design for four bridge towers 3, unequal height arrangement of the bridge towers 3, large-hole span configuration of a high bridge tower, and small-hole span configuration of a low bridge tower; a low bridge tower 3 is arranged close to the airport side, a high bridge tower 3 is arranged far away from the airport side, and the heights of the four bridge towers 3 are H respectively 1 、H 2 、H 3 、H 4 Wherein H is 1 <H 2 <H 3 <H 4 Meanwhile, the pairs of stay cables 4 are matched with the tower heights, and the four bridge towers 3 respectively adopt seven pairs, eight pairs and nine pairs of stay cables 4, so that the characteristics of large span and high tower, small span and low tower, gao Daduo stay cables and low tower with less stay cables are formed, the structural stress is reasonable, the number of the stay cables 4 is reduced to a certain extent, and the engineering cost is reduced.
In the description of the present utility model, it should be understood that the terms "small mileage side", "large mileage side", "upper", "lower", "lateral bridge direction", "longitudinal bridge direction", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The content of the utility model is not limited to the examples listed, and any equivalent transformation to the technical solution of the utility model that a person skilled in the art can take on by reading the description of the utility model is covered by the claims of the utility model.
Claims (7)
1. Multi-tower asymmetric low-tower cable-stayed bridge structure is characterized in that: the bridge comprises a side span (1), a main span (2) and a bridge tower (3), wherein a steel truss girder (5) is fixedly connected with the bottom of the bridge tower (3); one end of the stay cable (4) is fixedly connected with the bridge tower (3), and the other end of the stay cable is fixedly connected with the steel truss girder (5);
the lower part of the steel truss girder (5) is provided with a main pier (8), an auxiliary pier (7) and a connecting pier (6), a bearing platform (9) is arranged below the main pier (8), the auxiliary pier (7) and the connecting pier (6), and a foundation (10) is arranged below the bearing platform (9);
the top surfaces of the main pier (8), the auxiliary pier (7) and the connecting pier (6) are provided with supports (20), a transverse bridge of the main pier (8) at the center position is provided with a longitudinal and transverse fixed support (22) to one side, the other side is provided with a longitudinal fixed support (23), and other bridge piers are provided with longitudinal movable supports (24) and longitudinal and transverse movable supports (25);
the two sides of the support (20) are provided with dampers (21) along the bridge direction, the tops of the dampers (21) are fixedly connected with the steel truss beams (5), and the bottoms of the dampers are fixedly connected with the top surface of the pier.
2. The multi-pylon asymmetric low-pylon cable-stayed bridge structure of claim 1, wherein: the included angle between the damper (21) and the center of the support (20) is 45 degrees.
3. The multi-pylon asymmetric low-pylon cable-stayed bridge structure of claim 2, wherein: the steel truss girder (5) comprises an upper deck structure (12) and a lower deck structure (13), wherein two main trusses (11) are arranged in the transverse bridge direction, and the upper deck structure (12), the lower deck structure (13) and the main trusses (11) are fixedly connected through a transverse cross brace (14), a transverse diagonal brace (15), a diagonal brace (16) and a hanging rod (17).
4. A multi-pylon asymmetric low-pylon cable-stayed bridge structure according to claim 3, wherein: the upper deck structure (12) of the standard section of the steel truss girder (5) is an orthotropic steel deck (18), and the upper deck structure (12) of the weight pressing section is a steel truss concrete combined deck (19); the middle driving area of the lower deck structure (13) is an orthotropic steel deck (18), and bridge panels at two sides of the driving area are hollow structures.
5. The multi-pylon asymmetric low-pylon cable-stayed bridge structure of claim 4, wherein: the side span (1) and the main span (2) are arranged in an asymmetric span mode.
6. The multi-pylon asymmetric low-pylon cable-stayed bridge structure of claim 5, wherein: the bridge towers (3) are arranged at unequal heights, the large-hole bridge tower (3) is arranged across the high bridge tower, and the small-hole bridge tower (3) is arranged across the low bridge tower.
7. The multi-pylon asymmetric low-pylon cable-stayed bridge structure of claim 6, wherein: the number of the stay cables (4) is matched with the height of the bridge tower (3), the high bridge tower (3) is provided with more stay cables (4), and the low bridge tower (3) is provided with less stay cables (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320390841.2U CN219490643U (en) | 2023-03-06 | 2023-03-06 | Multi-tower asymmetric low-tower cable-stayed bridge structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320390841.2U CN219490643U (en) | 2023-03-06 | 2023-03-06 | Multi-tower asymmetric low-tower cable-stayed bridge structure |
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| CN219490643U true CN219490643U (en) | 2023-08-08 |
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| CN202320390841.2U Active CN219490643U (en) | 2023-03-06 | 2023-03-06 | Multi-tower asymmetric low-tower cable-stayed bridge structure |
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- 2023-03-06 CN CN202320390841.2U patent/CN219490643U/en active Active
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