CN111101434B - Cable-stayed bridge with tensioned midspan girder - Google Patents
Cable-stayed bridge with tensioned midspan girder Download PDFInfo
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- CN111101434B CN111101434B CN202010108896.0A CN202010108896A CN111101434B CN 111101434 B CN111101434 B CN 111101434B CN 202010108896 A CN202010108896 A CN 202010108896A CN 111101434 B CN111101434 B CN 111101434B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
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Abstract
The invention relates to a bridge structure, in particular to a cable-stayed bridge with a mid-span girder pulled, which comprises bridge towers, a mid-span stay cable, a stay cable anchored on the ground at a side span, a stay cable anchored on the girder at a side span, a mid-span girder, a side-span girder, a ground anchoring structure of the side-span stay cable and expansion joints, wherein the number of the bridge towers is at least two; the upper end of the mid-span stay cable is anchored on the bridge tower, and the lower end is anchored on the mid-span girder; the upper ends of the side span stay cables are anchored on the bridge tower, the lower ends of part of the side span stay cables are anchored on the side span main beam, and the lower ends of the rest of the side span stay cables are anchored on the ground anchoring structure; the main beam is continuous; expansion joints are respectively arranged between the ground anchoring structures of the side span main beam and the side span stay cable. The cable-stayed bridge provided by the invention has the structural characteristics that the side span is short, and the midspan girder is pulled, compared with the bridge in the prior art, the bridge has the advantages of low manufacturing cost, high driving comfort and small influence on the environment, and is more suitable for railway cable-stayed bridges, highways and railway co-construction cable-stayed bridges.
Description
Technical Field
The invention relates to a bridge structure, in particular to a cable-stayed bridge with a tensioned midspan girder.
Background
In the valley terrains in the severe mountainous area, due to the limitation of the conditions such as terrains, traffic, geology and the like, the construction of the arch bridge is high in cost, high in risk and long in construction period, and at the moment, the cable-stayed bridge is often a more appropriate structural scheme. The cable-stayed bridge is limited by terrain and geological factors, and a conventional cable-stayed bridge form with a main beam completely anchored by self is adopted when a sufficiently long side span cannot be set, as shown in fig. 1. The cable-stayed bridge with the main beams anchored completely needs to excavate a large amount of foundations to set up the side span, so that more engineering waste is caused, and the damage to the environment is large.
In order to solve the defect of overlong side span caused by the cable-stayed bridge form of the whole self-anchored main beam, a scheme of partially anchoring the cable-stayed bridge is adopted in the cable-stayed bridge close to the ground in a mountainous area or the side span, such as a Chinese Yunyang Hanjiang bridge and the like. The scheme of the cable-stayed bridge adopting partial ground anchors at home and abroad generally adopts rigid connection of a side span main beam and a ground anchor part, wherein a mid-span main beam is disconnected near a mid-span, and a structure which can transmit certain bending moment and shearing force, does not transmit axial force and can move longitudinally, such as a bracket or a drawer beam, is arranged at the disconnected part, as shown in fig. 2. According to the scheme, all the main beams are pressed, the axial force of the main beam at the bridge tower is the largest, and the axial force of the main beam at the midspan and midspan is zero. The midspan girder is disconnected to reduce the girder axial force that temperature and concrete shrink, creep etc. arouse, generally set up drawer beam structure or bracket structure, super large displacement expansion joint and track expansion controller in midspan girder disconnection department, the cost is high, and easy the damage, later stage maintenance and maintenance work load are big, and the cost is also high.
When a high-speed train passes through the breaking position of the midspan girder, the expansion amount and the break angle are large, and the safety of the train and the comfort of passengers are seriously influenced. The main beam breaking structure adopting the drawer beam or the bracket is generally only suitable for a box type main beam and is difficult to be suitable for a truss beam or a combined main beam of the box beam and the truss beam. In addition, the axial pressure of the main girder of the cable-stayed bridge is basically the same as that of a cable-stayed bridge with a conventional side span, and the main girder of the cable-stayed bridge is very large, needs more materials and limits the development of the span of the cable-stayed bridge to a larger span.
Disclosure of Invention
The invention aims to: the cable-stayed bridge is characterized in that a drawer beam or a bracket is arranged at the middle part of a midspan girder in order to avoid overlong side spans, so that the bridge is high in cost, easy to damage, large in later-stage maintenance and repair workload and poor in driving comfort.
In order to achieve the purpose, the invention adopts the technical scheme that:
a cable-stayed bridge with a mid-span main beam pulled comprises bridge towers, a mid-span cable-stayed cable, a side-span cable-stayed cable anchored on a ground anchoring structure, a side-span cable-stayed cable anchored on the main beam, a mid-span main beam, a side-span main beam, a ground anchoring structure of the side-span cable-stayed cable and expansion joints, wherein the number of the bridge towers is at least two; the upper end of the mid-span stay cable is anchored on the bridge tower, and the lower end of the mid-span stay cable is anchored on the mid-span girder; the upper ends of the side span stay cables are anchored on the bridge tower, the lower ends of part of the side span stay cables are anchored on the side span main beam, and the lower ends of the rest of the side span stay cables are anchored on the ground anchoring structure; the main beam is continuous; expansion joints are respectively arranged between the side span main beam and the ground anchoring structure of the side span stay cable to release the longitudinal displacement of the main beam, and the main beam and the stay cable are symmetrically arranged around a longitudinal center line.
The term "longitudinal" refers to the direction along the length of the bridge. The term "main beam continuous" means that the main beam can be used to transfer axial forces, shear forces, bending moments and torque.
In a preferred embodiment of the present invention, the main beam is one of a box girder, a girder, or a combination of box girders and girders.
As a preferable scheme of the present invention, most of the side span stay cables are anchored to the ground anchoring structure.
As a preferred scheme of the invention, when the cable-stayed bridge is used for railway or combined highway and railway construction, a track telescopic adjuster is arranged between the beam end of the main beam and the ground anchoring structure of the side span cable-stayed cable, so that the axial force in the steel rail is reduced.
As a preferable scheme of the invention, an external prestress structure is adopted on the midspan girder.
As a preferable scheme of the present invention, the prestressed structure includes a prestressed strand and an anchor plate, one end of the prestressed strand is connected to one of the anchor plates, the other end of the prestressed strand is connected to the other of the anchor plates, and the anchor plate is fixedly connected to the mid-span main beam.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention provides a cable-stayed bridge, which realizes short side span by anchoring part of a stay cable of the side span on a ground anchoring structure, wherein an expansion joint is arranged between the ground anchoring structure of the side span stay cable and a main beam; expansion joints and track telescopic adjusters are respectively arranged between the ground anchoring structure of the stay cable and the main beam, the specifications of the expansion joints and the track telescopic adjusters are reduced by more than half, the manufacturing cost is low, and the maintenance amount is small; the midspan main beam is continuous, the safety is good when the train passes a bridge, and the comfort level of passengers is high; the arrangement of the short-span or mid-span main beam external extension section can solve the problem that the beam end corner is too large to facilitate the train to pass through, the application range of the existing ground anchor type cable-stayed bridge is expanded to the field of rail and railway transportation, and a part of stay cables are anchored in a ground anchoring structure, so that the vertical rigidity, the transverse rigidity and the torsional rigidity of the bridge are higher, the cable-stayed bridge is more suitable for a high-speed railway cable-stayed bridge, and a new selectable bridge type is provided for the construction of mountainous railway; because the main beam is continuous, various main beam types such as a box girder, a truss girder and a combination of the box girder and the truss girder can be adopted, and the structural types of the main beam of the ground anchor type cable-stayed bridge are greatly widened; after part of the stayed-cable is anchored on the ground anchoring structure, the midspan girder is partially pulled and partially pressed, the axial pressure in the girder is greatly reduced, thereby improving the spanning capability of the cable-stayed bridge and enabling the span of the cable-stayed bridge to reach more than 1500 m.
Compared with the cable-stayed bridge with the girder of the prior art which is completely anchored, the cable-stayed bridge has the following advantages: 1) the length of the side span is greatly reduced, the total length of the bridge is reduced, and the construction cost is saved. 2) Greatly reduces the engineering excavation for setting the side span, saves the manufacturing cost and protects the environment. 3) The midspan girder part is pulled, so that the huge axial pressure in the girder is reduced, and the girder material is saved and the construction cost is saved. 4) The mid-span girder part is pulled, the axial pressure of the girder at the bridge tower is greatly reduced, thereby greatly improving the span of the spanning capability of the cable-stayed bridge and enabling the span of the cable-stayed bridge to reach more than 1500 m. 5) In addition, as part of the side span stay cable is anchored on the ground, the longitudinal, transverse and torsional deformations of the main beam under the action of live load are reduced, thereby improving the vertical, transverse and torsional rigidity of the cable-stayed bridge, and being particularly beneficial to railway cable-stayed bridges.
Compared with the partial ground anchor type cable-stayed bridge with the structure that the midspan girder is disconnected and the bending moment and the shearing force are transmitted but the axial force is not transmitted in the prior art, the invention has the following advantages: 1) the midspan girder part is pulled, thereby reducing the huge axial pressure of the girder at the bridge tower, reducing the material of the girder and saving the construction cost. 2) The expansion joint and the track expansion adjuster are arranged between the side span main beam and the stay cable ground anchoring structure, so that the disconnection of the mid-span main beam is not needed, the continuity of the mid-span main beam is ensured, the ultra-large displacement track expansion adjuster and the expansion joint are omitted, the workload of maintenance is greatly reduced, the safety of train operation and the comfort of passengers are improved, and the cable-stayed bridge is particularly favorable for a high-speed railway. 3) The girder can adopt box girder, longeron and the girder type of box girder and longeron combination, has widened the girder type scope of ground anchor formula cable-stay bridge greatly. 4) The mid-span girder is partially pulled and partially pressed, so that the axial pressure in the girder is greatly reduced, the span of the cable-stayed bridge is improved, and the span of the cable-stayed bridge can reach more than 1500 m.
Drawings
Fig. 1 is a schematic diagram of a cable-stayed bridge with a girder anchored by itself and a girder axial force thereof in the prior art.
Fig. 2 is a schematic axial force diagram of a partially anchored cable-stayed bridge and a main girder thereof constructed in the prior art by breaking a mid-span main girder and providing a structure for transferring bending moment and shearing force without transferring axial force.
Fig. 3 is a schematic diagram of a short-side span cable-stayed bridge with a tensioned midspan girder portion and a girder axial force thereof according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of an edgeless cable-stayed bridge with a full tension of a midspan girder and a girder axial force thereof provided in embodiment 2 of the present invention.
Fig. 5 is a schematic view of an external prestress steel beam of a midspan girder according to an embodiment of the present invention.
Icon: 1-a bridge tower; 2-mid-span stay cable; 31-side span stay cables anchored on the ground; 32-a side span stay cable anchored on the side span main beam; 41-midspan girder; 42-side span main beam; 43-an outer extension section of a midspan girder; 5-ground anchoring structure of the side span stay cable; 6-expansion joint and track expansion adjuster; 7-a bridge tower foundation; 10-prestressed strand; 11-anchor plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Please refer to fig. 3-5.
The embodiment of the invention provides a cable-stayed bridge structure system with a pulled mid-span girder, which comprises a bridge tower 1, a mid-span stay cable 2, a side-span stay cable 31 anchored on the ground, a side-span stay cable 32 anchored on the side-span girder, a mid-span girder 41, a side-span girder 42, a ground anchoring structure 5 of the side-span stay cable and an expansion joint. The cable-stayed bridge jointly built by railways and railways further comprises a track expansion adjuster. The number of pylons 1 is at least two and requires the general arrangement of main beams and stay cables to be symmetrical about a longitudinal midline. The bottom of the bridge tower 1 is a bridge tower foundation 7.
The upper end of the mid-span stayed cable 2 is anchored on the bridge tower 1, and the lower end is anchored on the mid-span main beam 41. The upper ends of the side span stay cables are anchored on the bridge tower 1, the lower ends of part of the side span stay cables are anchored on the side span main beam 41, and the lower ends of the rest of the side span stay cables are anchored on the ground anchoring structure. Expansion joints are respectively arranged between the side span main beam 42 and the ground anchoring structure 5 of the side span stay cable to release the longitudinal displacement of the main beam. For the cable-stayed bridge built by the railway and the highway and railway, an expansion joint and a track expansion adjuster 6 are arranged, and the track expansion adjuster is used for releasing the longitudinal displacement of the steel rail.
The main beam is continuous, and can be a box girder, a truss girder or a combination girder of the box girder or the truss girder.
The invention provides a cable-stayed bridge, which realizes short side span by anchoring part of a stay cable of the side span on a ground anchoring structure, wherein an expansion joint and a track expansion adjuster 6 are arranged between the ground anchoring structure 5 of the side span stay cable and a main beam, the main beam is a continuous structure, and part of a mid-span main beam 41 is pulled, thereby reducing the huge axial pressure of the main beam and saving materials and engineering cost; expansion joints and track telescopic adjusters 6 are respectively arranged between the ground anchoring structure 5 of the side span stay cable and the main beam, the specifications of the expansion joints and the track telescopic adjusters 6 are reduced by more than half, the manufacturing cost is low, and the maintenance and repair amount is small; the midspan main beam 41 is continuous, so that the safety is good when the train passes a bridge, and the comfort level of passengers is high; the arrangement of the short-span or mid-span main beam external extension section 43 can solve the problem that the beam end corner is too large to facilitate the train passing, expand the application range of the existing ground anchor type cable-stayed bridge to the rail and railway transportation field, and anchor part of the stay cables in the ground anchor structure, so that the vertical rigidity, the transverse rigidity and the torsional rigidity of the bridge are higher, the bridge is more suitable for the cable-stayed bridge of the high-speed railway, and a new selectable bridge type is provided for the construction of the mountain railway; because the main beam is continuous, various main beam types such as a box girder, a truss girder and a combination of the box girder and the truss girder can be adopted, and the structural types of the main beam of the ground anchor type cable-stayed bridge are greatly widened; after part of the stayed-cable is anchored on the ground anchoring structure, part of the midspan girder 41 is pulled and part is pressed, the axial pressure in the girder is greatly reduced, thereby improving the spanning capability of the stayed-cable bridge and enabling the span of the stayed-cable bridge to reach more than 1500 m.
Preferably, the part of the side span of the stay cable is anchored on the ground, and the cable-stayed bridge is generally arranged as shown in fig. 3, wherein the main beam of the mid-span is partially stressed when being pulled, and the main beam of the side span of the stay cable is fully stressed when being anchored.
One special example of the present invention is that all the side span stay cables are anchored on the ground anchoring structure 5 of the side span stay cables, and at this time, the midspan girder 41 is all pulled. For railway cable-stayed bridges, in order to solve the problem of overlarge beam-end corners at the bridge tower 1, an external extension section 43 of the midspan girder is arranged, the overall arrangement is shown in figure 4, and the midspan girder 41 is completely pulled. The external extension section 43 of the midspan girder can be omitted for the highway cable-stayed bridge with uncontrolled beam end corner.
Preferably, if the main beam is a steel-concrete combined beam main beam or a concrete main beam, an external prestress structure is arranged in a region with larger axial tension in the midspan, so as to reduce the axial tension of the main beam near the midspan. Referring specifically to fig. 5, one end of the prestressed strand 10 is connected to one anchor plate 11, and the other end of the prestressed strand 10 is connected to the other anchor plate 11. The anchor plate 11 is fixedly connected to the base plate.
The cable-stayed bridge with the tensioned midspan girder in the embodiment has the beneficial effects that:
the axial force of the side span stay cable and the middle span stay cable 2 of the cable-stayed bridge provided by the invention to the main beam is unbalanced, so that the part of the middle span main beam 41 is stressed;
compared with the cable-stayed bridge with the girder of the prior art which is completely anchored, the cable-stayed bridge has the following advantages: 1) the length of the side span is greatly reduced, the total length of the bridge is reduced, and the construction cost is saved. 2) Greatly reduces the engineering excavation for setting the side span, saves the manufacturing cost and protects the environment. 3) The mid-span main beam 41 is partially pulled, so that the huge axial pressure in the main beam is reduced, and the main beam material is saved, thereby saving the construction cost. 4) The mid-span girder 41 is partially pulled, so that the axial pressure of the girder at the bridge tower 1 is greatly reduced, the span of the cable-stayed bridge is greatly improved, and the span of the cable-stayed bridge can reach more than 1500 m. 5) In addition, as part of the side span stay cable is anchored on the ground, the longitudinal, transverse and torsional deformations of the main beam under the action of live load are reduced, thereby improving the vertical, transverse and torsional rigidity of the cable-stayed bridge, and being particularly beneficial to railway cable-stayed bridges.
Compared with the partial ground anchor type cable-stayed bridge with the structure that the midspan girder is disconnected and the bending moment and the shearing force are transmitted but the axial force is not transmitted in the prior art, the invention has the following advantages: 1) the midspan girder 41 is partially pulled, so that the huge axial pressure of the girder at the bridge tower 1 is reduced, and the material of the girder is reduced, thereby saving the construction cost. 2) The expansion joint and the track expansion adjuster 6 are arranged between the side span main beam 42 and the ground anchoring structure 5 of the side span stay cable, so that disconnection at the midspan main beam 41 is not needed, the continuity of the midspan main beam 41 is ensured, the overlarge displacement track expansion adjuster and the expansion joint are omitted, the workload of maintenance is greatly reduced, the safety of train operation and the comfort of passengers are improved, and the system is particularly favorable for high-speed railway cable-stayed bridges. 3) The girder can adopt a box girder, a truss girder or a girder formed by combining the box girder and the truss girder, and the girder type range of the ground anchor type cable-stayed bridge is greatly widened. 4) The mid-span girder 41 is partially pulled and partially compressed, so that the axial pressure in the girder is greatly reduced, the span of the cable-stayed bridge is improved, and the span of the cable-stayed bridge can reach more than 1500 m.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A cable-stayed bridge with a mid-span main beam (41) under tension is characterized by comprising bridge towers (1), mid-span stay cables (2), side-span stay cables (31) anchored on the ground, side-span stay cables (32) anchored on the main beams, mid-span main beams (41), side-span main beams (42), ground anchoring structures (5) of the side-span stay cables and expansion joints, wherein the number of the bridge towers (1) is at least two;
the upper end of the mid-span stay cable (2) is anchored on the bridge tower (1), and the lower end is anchored on the mid-span girder (41);
the upper ends of the side span stay cables are anchored on the bridge tower (1), the lower ends of part of the side span stay cables are anchored on the side span main beam (42), and the lower ends of the rest of the side span stay cables are anchored on the ground anchoring structure;
the main beam is continuous, and the main beam is one of a box girder, a truss girder or a combination girder of the box girder and the truss girder;
expansion joints are respectively arranged between the side span main beam (42) and the ground anchoring structure (5) of the side span stay cable to release the longitudinal displacement of the main beam;
the main beams and the stay cables are symmetrically arranged around a longitudinal center line;
the cable-stayed bridge is a railway cable-stayed bridge, and a track expansion adjuster is arranged between the girder end of the main girder and the ground anchoring structure (5) of the side span stay cable;
when all the stay cables in the side span stay cables are anchored on the ground anchoring structure (5) of the side span stay cables, the two ends of the midspan girder (41) are provided with midspan girder external extension sections (43).
2. The cable-stayed bridge with a tensioned mid-span girder (41) according to claim 1, wherein some or all of the side-span stay cables are anchored to the ground anchoring structure (5) of the side-span stay cables.
3. The cable-stayed bridge with the mid-span girder (41) in tension according to claim 1, characterized in that an external prestressing structure is adopted on the mid-span girder (41).
4. The cable-stayed bridge with the tensioned mid-span girder (41) according to claim 3, characterized in that the prestressed structure comprises prestressed strands (10) and anchor plates (11), one end of the prestressed strands (10) is connected with one of the anchor plates (11), the other end of the prestressed strands (10) is connected with the other anchor plate (11), and the anchor plates (11) are fixedly connected to the mid-span girder (41).
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| CN201911422220 | 2019-12-31 | ||
| CN2019114222202 | 2019-12-31 |
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| CN111101434A CN111101434A (en) | 2020-05-05 |
| CN111101434B true CN111101434B (en) | 2022-01-04 |
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| CN112482192A (en) * | 2020-11-06 | 2021-03-12 | 上海市政工程设计研究总院（集团）有限公司 | Midspan tensioned self-anchored cable-stayed bridge and construction method thereof |
| CN112832114B (en) * | 2020-12-10 | 2022-12-09 | 中铁第四勘察设计院集团有限公司 | Stay cable bridge and anchoring optimization method thereof |
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