CN112239992A - Novel three-tower self-anchored suspension bridge and construction method thereof - Google Patents
Novel three-tower self-anchored suspension bridge and construction method thereof Download PDFInfo
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- CN112239992A CN112239992A CN202011098220.4A CN202011098220A CN112239992A CN 112239992 A CN112239992 A CN 112239992A CN 202011098220 A CN202011098220 A CN 202011098220A CN 112239992 A CN112239992 A CN 112239992A
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- 239000000725 suspension Substances 0.000 title claims abstract description 48
- 238000010276 construction Methods 0.000 title claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 9
- 230000007774 longterm Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000011161 development Methods 0.000 description 1
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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
- E01D19/00—Structural or constructional details of 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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The utility model provides a three-tower is from anchor suspension bridge, it includes two side piers, set up two supplementary mounds at two side pier inboards, set up three main tower between two supplementary mounds, the girder, a plurality of main cables that are fixed in the main tower and a plurality of hoist cable that are used for carrying the girder, a serial communication port, the girder setting is at the side pier, on the supplementary mound and wear to locate the main tower, between adjacent main tower, erect main cable between supplementary mound and the main tower, main cable is the space cable face, main cable is detained with the girder at midspan position through central authorities and is connected, restraint relative displacement between them. The invention forms a three-tower self-anchored suspension bridge structure system through the central buckle, increases the horizontal constraint of the midspan main cable on the top of the middle tower, thereby reducing the longitudinal bridge bending moment at the bottom of the middle tower under unbalanced live load, reducing the structural size of the middle tower, improving the vertical rigidity of the structure, improving the economic span of the three-tower self-anchored suspension bridge, being suitable for the three-tower self-anchored suspension bridge with the span of more than 400m, and being suitable for the large-span highway rail co-construction bridge.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and relates to a three-tower self-anchored suspension bridge and a construction method thereof.
Background
The three-tower self-anchored suspension bridge is appreciated by most people due to the beautiful line shape and the well-laid appearance, and is more and more favored by people particularly in urban bridges. The maximum span of the three-tower self-anchored suspension bridge at home and abroad is not more than 200 m. When the span is increased, the unbalanced bending moment at the bottom of the middle tower is obviously increased; when the size rigidity of the middle tower is increased, the anti-sliding coefficient of the main cable of the saddle of the middle tower is obviously reduced. The conflict between the two limits the development of the span of the three-tower self-anchored suspension bridge.
For public rail co-construction bridges, a box girder structure with public rails on the same layer can be generally adopted, a truss structure with the public rails layered can also be adopted, the truss structure is not suitable for maintenance compared with the box girder structure, the box girder structure is easier to be subjected to incremental launching construction, and the method is more suitable for conditions of a construction site.
The existing three-tower self-anchored suspension bridge towers are generally positioned on the outer side of a main beam in the transverse direction, and when a bridge deck is too wide, the transverse distance between the main towers is too large; however, when the bridge tower is arranged at the transverse center of the main beam as a single tower, the size of the bridge tower is often large if the stress and stability of the bridge tower are required to be met.
How to solve the stress of the tower in the long-span three-tower self-anchored suspension bridge and how to balance the mechanics of the wide-deck three-tower self-anchored suspension bridge and the size of the bridge tower is a problem to be solved all the time.
Disclosure of Invention
The invention aims to provide a three-tower self-anchored suspension bridge and a construction method thereof, and aims to solve the problems that the span of the three-tower self-anchored suspension bridge is difficult to break through and the balance between the mechanics of a wide bridge deck and the size of a bridge tower is difficult to realize in the prior art.
The invention solves the technical problems through the following technical scheme:
the utility model provides a three-tower is from anchor suspension bridge, it includes two side piers, set up two supplementary mounds at two side pier inboards, set up three main tower between two supplementary mounds, the girder, a plurality of main cables that are fixed in the main tower and a plurality of hoist cable that are used for carrying the girder, a serial communication port, the girder setting is at the side pier, on the supplementary mound and wear to locate the main tower, between adjacent main tower, erect main cable between supplementary mound and the main tower, main cable is the space cable face, main cable is detained with the girder at midspan position through central authorities and is connected, restraint relative displacement between them.
Furthermore, the three-tower self-anchored suspension bridge is a highway and light rail combined bridge, the light rail lane is positioned in the middle of the bridge floor, the motor vehicle lane is positioned on the outer side of the bridge floor, and the main cable and the bridge tower are positioned between the light rail lane and the motor vehicle lane.
Furthermore, the main beam is a composite beam or a steel box beam.
Furthermore, vertical supporting pieces are arranged between the part of the main beam penetrating through the main tower and the main tower, the vertical supporting pieces are arranged between the main beam and the corbels of the bridge tower of the main tower, and the supporting distance is transversely enlarged to act on the corbels on the outer side of the bridge tower so as to improve the torsional rigidity of the structure.
Auxiliary spans are formed between the side piers on the two sides and the auxiliary piers, and the functions of reducing the corners of the beam ends and partial weights can be achieved.
A construction method of a three-tower self-anchored suspension bridge is characterized by comprising the following steps:
step 1, building two side piers and two auxiliary piers, and building a plurality of lower main tower columns and a plurality of temporary piers between the two side piers;
step 2, building a steel main beam, wherein the steel main beam is erected on the side pier, the auxiliary pier and the temporary pier and penetrates through the main tower;
step 5, erecting a sling between the main steel beam above the temporary pier and the main cable;
and 7, installing a central buckle, tensioning the temporary suspender at the position before installation, and removing the temporary suspender after the installation of the central buckle is finished so that the internal force of the temporary suspender is converted into the central buckle.
And 8, re-tensioning the force of the lifting rod according to the constant load increase of the light rail in a long term after the bridge is formed, so that secondary conversion of the system is realized.
Further, when the main beam is a combined beam, a step 5a is added between the step 5 and the step 6, and a concrete bridge deck is built on the steel main beam; the concrete bridge deck is a cast-in-place concrete bridge deck.
The positive progress effects of the invention are as follows: the novel three-tower self-anchored suspension bridge structural system is formed by the central buckle, the horizontal constraint of the midspan main cable on the top of the middle tower is increased, the longitudinal bridge bending moment of the bottom of the middle tower under unbalanced live load is reduced, the vertical rigidity of the structure is improved, the economic span of the three-tower self-anchored suspension bridge is improved, and the three-tower self-anchored suspension bridge is suitable for three-tower self-anchored suspension bridges with the span of more than 400m and is suitable for large-span common rail co-construction bridges. The bridge deck structure is super wide, and the bridge tower passes from the box roof beam centre, has solved the atress problem of broad width bridge floor. Meanwhile, in the construction process, the main beam adopts pushing construction, upper tower column swivel construction or segment assembly of the middle tower is completed in the main beam pushing process, upper tower column swivel construction or segment assembly of the side tower is completed after the main beam is pushed in place, the construction progress is accelerated, and finally installation of the central buckle is completed through pretensioning of the temporary suspender, so that internal force distribution of the central buckle is improved. The stress of the short-term bridge and the long-term bridge is optimal through the long-term secondary tensioning of the suspender.
Drawings
Fig. 1 is a schematic structural view of a three-tower self-anchored suspension bridge according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a main tower of a three-tower self-anchored suspension bridge according to a preferred embodiment of the present invention.
Fig. 3 is a schematic structural view of a main beam of a three-tower self-anchored suspension bridge according to a preferred embodiment of the present invention.
Fig. 4 is a schematic diagram of a center buckle structure of a three-tower self-anchored suspension bridge according to a preferred embodiment of the present invention.
Fig. 5 is a schematic structural view of a suspension bridge under construction using a construction process of a three-tower self-anchored suspension bridge according to a preferred embodiment of the present invention.
Detailed Description
The present invention will be more clearly and completely described in the following description of preferred embodiments, taken in conjunction with the accompanying drawings.
As shown in fig. 1, 2 and 3, a three-tower self-anchored suspension bridge comprises a foundation 1, two side piers 2, two auxiliary piers 12, main girders erected on the side piers 2, a plurality of main towers 3 located between the side piers 2, a plurality of main cables 4 fixed to the main towers 3, and a plurality of slings 5 for lifting the main girders. As shown in fig. 3, the main beams may be composite beams or steel box beams, including the main steel beams 6 and the concrete deck 9 above the main steel beams 6 if the composite beams are composite beams, and including only the main steel beams 6 if the composite beams are steel box beams. The concrete bridge deck 9 is not shown in both fig. 1 and 2. As shown in fig. 2, the main steel beams 6 are inserted into the main tower 3, that is, the main steel beams 6 are slotted at positions staggered with the main tower, so that the vertical supporting members 13 are arranged between the parts of the main steel beams 6 inserted into the main tower 3 and the bridge tower brackets 10 of the main tower 3, and the supporting distance is transversely expanded to act on the bridge tower outer brackets. As shown in fig. 4, the main cable 4 and the main beam 6 are provided with a central buckle 11 at a midspan position to restrain the relative displacement of the two.
As shown in fig. 5, the construction process of the composite beam self-anchored suspension bridge includes the following steps:
step 1, building two side piers 2 and two auxiliary piers 12, and building a plurality of lower tower columns of a main tower 3 and a plurality of temporary piers 8 between the two side piers 2;
step 2, building a steel main beam 6, wherein the steel main beam 6 is erected on the side pier 2, the auxiliary pier 12 and the temporary pier 8 and penetrates through the main tower 3;
step 5, erecting a sling 5 between a main steel beam 6 above the temporary pier 8 and a main cable 4;
step 7, according to the near-term highway constant load tensioning sling 5, the initial length of the sling provides a reserved amount for the far-term light rail constant load; (ii) a
And 8, installing a central buckle 11, tensioning the temporary suspender at the position before installation, and removing the temporary suspender after the installation of the central buckle is finished so that the internal force of the temporary suspender is converted into the central buckle.
And 9, re-tensioning the lifting rod force 5 according to the constant load increase of the light rail in the long term after the bridge is formed, so that the secondary conversion of the system is realized, and the stress of the short-term bridge structure and the stress of the long-term bridge structure are optimal.
In the step 2 of the construction process, a pushing construction process is adopted for the construction of the steel girder, namely, a pushing platform is built at the position of the side pier 2, steel girder segments are assembled at the position of the pushing platform, segments are assembled, segments are pushed in a midspan after welding is completed, and the operation is circulated to midspan closure. The incremental launching construction process is a common construction process and is not described herein again.
In step 3 of the construction process, the tower column on the main tower 3 is constructed by rotating or assembled by sections.
Compared with the existing three-tower self-anchored suspension bridge, the suspension bridge disclosed by the invention forms a novel three-tower self-anchored suspension bridge structure system through the central buckle, and increases the horizontal constraint of the midspan main cable on the top of the middle tower, so that the longitudinal bridge bending moment at the bottom of the middle tower under unbalanced live load is reduced, the structural size of the middle tower is reduced, the structural vertical rigidity is improved, the economic span of the three-tower self-anchored suspension bridge is improved, and the suspension bridge is suitable for the large-span highway rail co-construction bridge. The bridge deck structure is super wide, and the bridge tower passes from the box roof beam centre, has both taken into account the atress problem of broad width bridge floor, has controlled the size of bridge tower again. The construction process accelerates the construction progress and improves the internal force distribution of the central button.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The utility model provides a three-tower is from anchor suspension bridge, it includes two side piers, set up two supplementary mounds at two side pier inboards, set up three main tower between two supplementary mounds, the girder, a plurality of main cables that are fixed in the main tower and a plurality of hoist cable that are used for carrying the girder, a serial communication port, the girder setting is at the side pier, on the supplementary mound and wear to locate the main tower, between adjacent main tower, erect main cable between supplementary mound and the main tower, main cable is the space cable face, main cable is detained with the girder at midspan position through central authorities and is connected, restraint relative displacement between them.
2. The triple tower self-anchored suspension bridge of claim 1, wherein said triple tower self-anchored suspension bridge is a highway, light rail composite bridge, light rail traffic lane is located in the middle of the deck, motor traffic lane is located outside the deck, and main cable and pylons are located between the light rail traffic lane and the motor traffic lane.
3. A triple tower self-anchored suspension bridge as in claim 1, wherein the main beams are composite beams or steel box beams.
4. A triple-tower self-anchored suspension bridge as claimed in claim 1, wherein vertical supports are provided between the main beam and the main tower at the portion where the main beam passes through the main tower, the vertical supports are provided between the main beam and the corbels of the main tower, and the support space is laterally enlarged to act on the corbels outside the main tower to improve torsional rigidity of the structure.
5. A construction method of a three-tower self-anchored suspension bridge is characterized by comprising the following steps:
step 1, building two side piers and two auxiliary piers, and building a plurality of lower main tower columns and a plurality of temporary piers between the two side piers;
step 2, building a steel main beam, wherein the steel main beam is erected on the side pier, the auxiliary pier and the temporary pier and penetrates through the main tower;
step 3, completing the upper tower column construction of a middle tower in the main tower pushing process, and completing the upper tower column construction of a side tower in the main tower after the main beam pushing is in place;
step 4, erecting main cables between adjacent main towers and between the auxiliary piers and the main towers;
step 5, erecting a sling between the main steel beam above the temporary pier and the main cable;
step 6, stretching the sling according to the near-term constant load of the highway, wherein the initial length of the sling provides a reserved amount for the far-term constant load of the light rail;
step 7, installing a central buckle, tensioning the temporary suspender at the position before installation, and removing the temporary suspender after the installation of the central buckle is finished so that the internal force of the temporary suspender is converted into the central buckle;
and 8, re-tensioning the force of the lifting rod according to the constant load increase of the light rail in the long term after the bridge is formed, so that the secondary conversion of the system is realized, and the stress of the short-term bridge structure and the stress of the long-term bridge structure are optimal.
6. The construction method of a triple-tower self-anchored suspension bridge as claimed in claim 5, wherein, when the main girder is a composite girder, a step 5a of building a concrete deck on the steel main girder is added between the steps 5 and 6; the concrete bridge deck is a cast-in-place concrete bridge deck.
7. The construction method of the three-tower self-anchored suspension bridge according to claim 5, wherein in the step 2, the construction of the steel girder adopts a pushing construction process.
8. The construction method of a triple-tower self-anchored suspension bridge as claimed in claim 5, wherein in step 3, the tower columns on the main tower are constructed by swivel or segmented.
9. The method of constructing a triple-tower self-anchored suspension bridge as claimed in claim 5, wherein in step 7, the temporary suspension rods are tensioned before the central buckles are installed, and the temporary suspension rods are removed after the central buckles are installed in place.
10. The construction method of a three-tower self-anchored suspension bridge as claimed in claim 5, wherein in step 8, the time of rail transit vehicle is different from the road according to the second-stage load of road and rail transit, and the boom force is re-tensioned according to the constant load increase of light rail in the long term after the bridge is formed, so as to realize the second conversion of the system.
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| CN202011098220.4A CN112239992A (en) | 2020-10-14 | 2020-10-14 | Novel three-tower self-anchored suspension bridge and construction method thereof |
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| CN202011098220.4A CN112239992A (en) | 2020-10-14 | 2020-10-14 | Novel three-tower self-anchored suspension bridge and construction method thereof |
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