CN112796196A - Bridge structure suitable for asymmetric rotation and construction method thereof - Google Patents
Bridge structure suitable for asymmetric rotation and construction method thereof Download PDFInfo
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- CN112796196A CN112796196A CN202110072676.1A CN202110072676A CN112796196A CN 112796196 A CN112796196 A CN 112796196A CN 202110072676 A CN202110072676 A CN 202110072676A CN 112796196 A CN112796196 A CN 112796196A
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- 238000010276 construction Methods 0.000 title claims description 24
- 239000004567 concrete Substances 0.000 claims abstract description 188
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 230000007704 transition Effects 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 5
- 238000007596 consolidation process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 241000561734 Celosia cristata Species 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 210000001520 comb Anatomy 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000005452 bending Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 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
- E01D1/00—Bridges in general
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for 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
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention provides a bridge structure suitable for asymmetric rotation, which comprises a bridge deck, an upper steel truss and a lower concrete beam, wherein the bridge deck is provided with a plurality of steel truss plates; the lower part concrete beam includes main concrete beam and side span concrete beam, and the main concrete beam of striding is more than the twice of bridge direction length for the side span concrete beam in the same direction as, and the main height of striding the concrete beam is less than the height of side span concrete beam, and the bridge in the same direction as of lower part concrete beam is equipped with main side pier and side span side pier to both ends, and main concrete beam and side span concrete beam junction below set up the pier of turning. The invention adopts the upper steel truss as a main stress structure, fully exerts the characteristics of light weight and high strength of the steel structure, simultaneously adopts reinforced concrete structures for bearing the axial pressure of the bridge and fully exerts the advantage of good compression resistance of concrete, and satisfies the moment balance of the main span and the side span dead weight relative to the swivel pier in the swivel stage by adjusting the height and the thickness of the side span concrete beam, thereby realizing the asymmetric balanced swivel.
Description
Technical Field
The invention belongs to the technical field of bridge design and construction, and particularly relates to a bridge structure suitable for asymmetric rotation and a construction method thereof.
Background
The planar swivel method has short influence time on crossing buildings, is convenient and quick, and is a preferred construction mode when newly-built roads and municipal road bridges cross railways and high-grade roads at present. Because the rotating spherical hinge can not resist unbalanced bending moment generated by different dead weights of the beam bodies on the two sides, the rotating spherical hinge generally adopts a T-shaped rigid frame or a cable-stayed bridge with symmetrical and equal left and right spans to realize balanced rotation.
However, symmetric swivels also have major limitations: (1) when an existing road (bridge) is widened, the side span and the main span need to be as long, and a newly built bridge before a swivel needs to be prefabricated perpendicular to the existing bridge, so that the newly built bridge is far away from the existing bridge, the land acquisition area is large, and the road plane linear condition is not ideal; (2) when there is the building in newly-built bridge one side near within range, in order to satisfy the prefabrication (pouring) condition of roof beam body before turning, need demolish the building in the influence scope. When the building is difficult to remove, the symmetric rotation body has no implementation condition.
If a certain bridge form can be adopted, the structure is asymmetric, namely the main span length is large, the side span length is small, the dead weight of the main span and the side span can be adjusted to achieve the balance of the bending moment of the main span and the side span on the swivel pier and the ball hinge, so that the balance swivel is realized, the limitation of the symmetrical swivel can be solved to a certain extent, the position of a newly-built bridge is close to the existing bridge as much as possible, or the removal can be reduced as much as possible.
The lower-bearing type truss bridge is an ideal asymmetric swivel bridge type, has high rigidity and light weight, and the height from the bridge floor to the beam bottom is far less than that of a prestressed concrete continuous beam, so that the longitudinal slope of a bridge can be effectively reduced, and the technical economy is obvious. However, if the steel truss is used completely, it is difficult to maintain and coat the lower chord member and the deck steel structure when crossing structures such as railways, and it is very dangerous to work on the railway contact net.
Disclosure of Invention
The invention aims to provide a bridge structure suitable for asymmetric rotation bodies, which can at least solve part of defects in the prior art.
In order to accomplish the above objects, the present invention provides a bridge structure adapted to an asymmetric swivel, including a bridge deck, an upper steel truss connected to an upper portion of the bridge deck, and a lower concrete girder connected to a lower portion of the bridge deck; the lower concrete beam comprises a main span concrete beam and a side span concrete beam, the length of the main span concrete beam in the bridge direction is more than twice of that of the side span concrete beam, the height of the main span concrete beam is smaller than that of the side span concrete beam, main span side piers and side span side piers for supporting the main span concrete beam and the side span concrete beam are respectively arranged at two ends of the lower concrete beam in the bridge direction, and swivel piers are arranged below the joint of the main span concrete beam and the side span concrete beam.
Furthermore, the main span concrete beam is a height-changing transition section in the length of one section of one end of the swivel pier, the height of the height-changing transition section from the main span concrete beam to the side span concrete beam is gradually increased, the height of the height-changing transition section close to one end of the main span concrete beam is the same as the height of the main span concrete beam, and the height of the height-changing transition section close to one end of the side span concrete beam is the same as the height of the side span concrete beam.
Furthermore, the main span concrete beam comprises main span concrete longitudinal beams arranged at two ends of the lower part of the bridge floor in the transverse direction of the bridge and a main span concrete cross beam connected between the two main span concrete longitudinal beams; the main span concrete cross beams are provided with a plurality of main span concrete cross beams which are distributed at equal intervals along the bridge direction.
Furthermore, the side span concrete beam adopts an integral concrete longitudinal beam with a solid rectangular cross section structure.
Further, upper portion steel truss is for holding formula truss structure down, including last chord member, web member and last tie-in, the last chord member has two, is located the bridge horizontal bridge respectively to both ends, and arranges along following the bridge to extending, it has a plurality of roots to go up the tie-in, connects between two last chord members, the web member has a plurality of roots, and follows the bridge and connect into the cockscomb structure to end in proper order, the upper end and the last chord member of web member are connected, and the lower extreme and the lower part concrete beam of web member are connected.
Furthermore, the lower end of the web member is connected with a lower chord gusset plate, and the lower end of the lower chord gusset plate extends into the lower concrete beam and is connected with the lower concrete beam through a PBL key.
Furthermore, bolt holes are reserved in the part, extending into the lower concrete beam, of the lower chord node plate, and transverse steel bars of the lower concrete beam penetrate through the bolt holes and are fixed with the lower chord node plate through nuts.
Furthermore, a micro-expansion concrete anchoring block is poured at the joint of the bridge deck of the lower chord gusset plate, and the lower chord gusset plate is connected with the micro-expansion concrete anchoring block through a stud.
Furthermore, supports for supporting the lower concrete beam are arranged on the main span side pier, the side span side pier and the rotating piers, and a rotating assembly for rotating the bridge is arranged at the lower part of the rotating piers.
In addition, the invention also provides a construction method of the bridge structure suitable for the asymmetric rotation, which comprises the following steps:
1) completing the construction of the swivel pier, the main span side pier, the side span side pier and the swivel assembly, and prefabricating an upper steel truss segment;
2) erecting a cast-in-place support along the railway direction, and binding reinforcing steel bars of a lower concrete beam, wherein the end of the side span concrete beam faces one side of the existing bridge;
3) the method comprises the following steps of (1) casting a main span concrete beam and an edge span concrete beam in situ, embedding a lower chord gusset plate in the main span concrete beam and the edge span concrete beam, and performing temporary consolidation in a mode that vertical steel bars of a pier part extend into the concrete beam;
4) welding the upper steel truss section by section;
5) removing the cast-in-place support and then performing plane rotation;
6) after the turning is finished, a turning assembly on the turning pier is sealed, temporary consolidation reinforcing steel bars are cut off, jacking force is applied to a lower concrete beam on the main span side pier and the side span side pier, supports are installed on the main span side pier and the side span side pier, and negative counter force does not occur on the supports on the side span side pier after operation;
7) and (5) constructing a bridge deck pavement layer and an anti-collision guardrail on the bridge deck.
Compared with the prior art, the invention has the beneficial effects that:
the bridge structure suitable for the asymmetric swivel adopts a steel-concrete truss combined two-span continuous beam structure, utilizes an upper steel truss as a main stress structure, fully exerts the characteristics of light weight and high strength of a steel structure, simultaneously adopts reinforced concrete structures for a lower concrete beam and a bridge deck system, is used for bearing the axial pressure of a bridge, fully exerts the advantage of good compression resistance of concrete, does not need maintenance and coating, and meets the requirement of moment balance of the main span and the side span dead weight relative to a swivel pier in the swivel stage by adjusting the height and the thickness of the side span concrete beam, thereby realizing the asymmetric balanced swivel.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic plan view of a bridge construction according to the present invention;
FIG. 2 is a schematic elevation view of the bridge construction of the present invention;
FIG. 3 is a schematic cross-sectional view of a main span concrete beam according to the present invention;
FIG. 4 is a schematic cross-sectional view of an edge-span concrete beam according to the present invention;
FIG. 5 is a schematic elevation view of a joint between an upper steel truss and a lower concrete beam according to the present invention;
fig. 6 is a schematic cross-sectional view of a connection node of an upper steel truss and a lower concrete beam according to the present invention.
Description of reference numerals: 1. a bridge deck; 2. an upper steel truss; 3. an upper chord; 4. a web member; 5. side span and side pier; 6. an edge-span concrete beam; 7. a swivel assembly; 8. turning piers; 9. a variable height transition section; 10. a main span concrete beam; 11. main span side piers; 12. a support; 13. a main span concrete stringer; 14. a main span concrete beam; 15. upper parallel connection; 16. a lower chord gusset plate; 17. a stud; 18. bolt holes; 19. a micro-expansive concrete anchor block.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements 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. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 and 2, the present embodiment provides a bridge structure suitable for an asymmetric swivel, including a deck 1, an upper steel truss 2 connected to an upper portion of the deck 1, and a lower concrete girder connected to a lower portion of the deck 1; the lower concrete beam comprises a main span concrete beam 10 and a side span concrete beam 6, the length of the main span concrete beam 10 in the bridge direction is more than twice of that of the side span concrete beam 6, the height of the main span concrete beam 10 is smaller than that of the side span concrete beam 6, main span side piers 11 and side span side piers 5 for supporting the main span concrete beam 10 and the side span concrete beam 6 are respectively arranged at two ends of the lower concrete beam in the bridge direction, and swivel piers 8 are arranged below the joint of the main span concrete beam 10 and the side span concrete beam 6. The embodiment adopts a two-span asymmetric structure, the span of the main span concrete beam 10 is large, and the span of the side span concrete beam 6 is small, so that the limitation of symmetric rotation can be solved to a certain extent, the position of a newly-built bridge is close to the existing bridge as much as possible, or the removal can be reduced as much as possible; when the main span and the side span are asymmetric, if the same cross section is adopted, the swivel system needs to bear the action of bending moment, and there is a risk of overturning and incapability of rotating, and in order to ensure the safety of the swivel system, in this embodiment, the upper structures on the left side and the right side of the swivel pier 8 are equal in moment generated by adjusting the height and the thickness of the side span concrete beam 6, so that asymmetric balanced swivel can be realized.
In this embodiment, the upper steel truss 2 is used as a main stressed structure, so as to fully exert the characteristics of light weight and high strength of the steel structure, and the lower concrete beam and the bridge deck system adopt reinforced concrete structures for bearing the axial pressure of the bridge, so as to fully exert the advantage of good compression resistance of concrete.
Furthermore, a height-changing transition section 9 is arranged in the length of one section of the main span concrete beam 10 at one end of the swivel pier 8, the height of the height-changing transition section 9 is gradually increased from the main span concrete beam 10 to the height of the side span concrete beam 6, the height of the height-changing transition section 9 close to one end of the main span concrete beam 10 is the same as the height of the main span concrete beam 10, and the height of the end close to the side span concrete beam 6 is the same as the height of the side span concrete beam 6; through the design that becomes high transition 9 structure to level and smooth transition adjustment main span concrete beam 10 and the difference in height between the concrete beam 6 of sidespan guarantee the stability of atress, in order to do benefit to and increase the sidespan weight, satisfy the moment balance of turning the mound relatively with the sidespan dead weight at the main span of turning stage.
For an embodiment of the lower concrete beam, as shown in fig. 3, the main span concrete beam 10 includes main span concrete longitudinal beams 13 disposed at both ends of a lower cross bridge of the deck 1, and a main span concrete cross beam 14 connected between the two main span concrete longitudinal beams 13; the main span concrete cross beams 14 are distributed at equal intervals along the bridge direction, the main span concrete longitudinal beams 13 and the main span concrete cross beams 14 form a lattice system, wherein the main span concrete longitudinal beams 13 and the main span concrete cross beams 14 are all solid rectangular cross-section structures. As shown in fig. 4, the side span concrete beam 6 is an integral concrete longitudinal beam with a solid rectangular cross-section structure. The lower concrete beam of this embodiment adopts ordinary reinforced concrete structure, does not establish the prestressing steel.
For a specific implementation manner of the upper steel truss 2, in this embodiment, a lower-supported truss structure is adopted, the height from the bridge floor to the beam bottom is small, which is beneficial to reducing the longitudinal slope of the road, and the technical economy is better, specifically, two steel trusses are arranged in the transverse bridge direction of the bridge structure, and each steel truss comprises an upper chord member 3, a web member 4 and an upper flat link 15, two upper chord members 3 are respectively positioned at two ends in the transverse bridge direction of the bridge and are arranged in a manner of extending along the bridge direction, and the upper chord members 3 are made of steel plates with box-shaped cross sections; the upper flat connection 15 is provided with a plurality of pieces and is connected between the two upper chords 3, and the upper flat connection 15 adopts a steel plate with an I-shaped cross section; the web members 4 are provided with a plurality of web members, and are sequentially connected into a saw-toothed shape along the bridge direction, the web members 4 are made of steel plates with I-shaped cross sections, the upper ends of the web members 4 are connected with the upper chord members 3, and the lower ends of the web members 4 are connected with the lower concrete beam. All welded structures are adopted among all components of the upper steel truss 2, and the stress structure of the bridge can be adjusted by controlling the length among the sections and the rigidity of the components of the upper steel truss 2, so that the lower concrete beam does not need to adopt prestress when adopting a reinforced concrete structure.
The connection mode between the upper steel truss 2 and the lower concrete beam is further refined, and the lower concrete beam and the upper steel truss structure above the bridge floor 1 are constructed in parallel to the railway in a support cast-in-place and assembly mode. As shown in fig. 5 and 6, the lower end of the web member 4 is connected with a lower chord gusset plate 16, the lower chord gusset plate 16 is made of a steel plate, and the lower end of the lower chord gusset plate 16 extends into the lower concrete beam and is connected with the lower concrete beam through a PBL key. Preferably, bolt holes 18 are reserved in the part, extending into the lower concrete beam, of the lower chord node plate 16, transverse steel bars of the lower concrete beam penetrate through the bolt holes 18 and are fixed with the lower chord node plate 16 through nuts, and therefore the connection stability of the upper steel truss 2 and the lower concrete beam is further improved.
Furthermore, a micro-expansion concrete anchor block 19 is poured at the joint of the bridge floor 1 of the lower chord gusset plate 16, and the lower chord gusset plate 16 is connected with the micro-expansion concrete anchor block 19 through a stud 17, so that the installation firmness of the upper steel truss 2 is further improved.
The main span side pier 11, the side span side pier 5 and the pier 8 that turns all are provided with the support 12 that supports lower part concrete beam, 8 lower parts of the pier that turns set up the swivel subassembly 7 that supplies the bridge to turn, adopt the mode of turning at the bottom of the pier promptly to turn the construction, and this swivel subassembly 7 adopts turning devices such as ball pivot, and its specific structure is prior art, and here is no longer repeated.
The concrete construction process of the bridge structure suitable for the asymmetric rotation body is as follows:
(1) completing the construction of the swivel pier 8, the main span side pier 11, the side span side pier 5 and the swivel assembly 7, prefabricating an upper steel truss segment in a factory, and transporting the upper steel truss segment to a construction site;
(2) erecting a cast-in-place support along the railway direction, and binding reinforcing steel bars of a lower concrete beam, wherein the end of the side span concrete beam 6 faces one side of the existing bridge;
(3) the main span concrete beam 10 and the side span concrete beam 6 are cast in place, the lower chord gusset plate 16 is embedded in the main span concrete beam and temporarily solidified in a mode that vertical steel bars of a pier part extend into the concrete beam;
(4) welding the upper steel truss 2 section by section;
(5) removing the cast-in-place support and then performing plane rotation;
(6) after the rotation is finished, the rotating body assembly 7 on the rotating body pier 8 is sealed, the temporary consolidation reinforcing steel bars are cut off, the jacking force is applied to the lower concrete beam on the main span side pier 11 and the side span side pier 5, the support 12 is arranged on the main span side pier 11 and the side span side pier 5, and the condition that the negative reaction does not occur on the support 12 on the side span pier 5 after operation is ensured;
(7) and (3) constructing a bridge deck pavement layer and an anti-collision guardrail on the bridge deck 1.
The construction of a through-type steel-concrete composite truss continuous beam bridge with the span of (43 + 20) m on a 2-strand railway line on a road in a certain scenic spot is carried out in a swivel mode. The right side of the newly-built bridge is provided with an existing highway bridge, and the newly-built bridge needs to be close to the existing highway bridge as much as possible according to the requirements of scenic spot planning; the specific design is as follows:
two upper steel trusses are transversely arranged in the full bridge, the distance is 1020cm, the height of the trusses is 700cm, and the length between truss sections is 600 cm. The upper chord is a 500 x 500mm box-shaped section, and the thickness of the steel plate is 16-24 mm; the web members are H-shaped sections with the width of 500mm and the height of 500mm, and the thickness of the steel plate is 16-20 mm; the upper parallel connection is an I-shaped section with the width of 360mm and the height of 360mm, and the thickness of the steel plate is 16 mm.
Two concrete lower chords (namely main span concrete longitudinal beams) of the main span concrete beam are solid rectangular sections of 800 multiplied by 800mm, the main span concrete beam is a solid rectangular section with the height of 800mm, the distance is 1500mm, and the longitudinal beams and the transverse beams form a lattice system. The side span concrete beam adopts an integral concrete longitudinal beam with a solid section, the height of the beam is 200cm, and the bottom width is 1100 cm. The lower concrete beam is of a common reinforced concrete structure and is not provided with prestressed reinforcements.
The upper steel truss and the lower concrete beam are connected by a lower chord node plate, the longitudinal length of the lower chord node plate is 2400mm, the lower chord node plate vertically extends into the lower concrete beam for 640mm, the lower chord node plate is provided with double rows of bolt holes, and transverse steel bars of the lower concrete beam penetrate through the bolt holes of the lower chord node plate and are fixed by nuts. The lower chord gusset plate is provided with a post-cast micro-expansion concrete anchoring block with the height of 400m on the top surface of the concrete beam, and is connected with the concrete through a stud.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. The utility model provides a bridge structures suitable for asymmetric rotation, its characterized in that: the steel truss bridge comprises a bridge deck, an upper steel truss connected to the upper part of the bridge deck and a lower concrete beam connected to the lower part of the bridge deck; the lower concrete beam comprises a main span concrete beam and a side span concrete beam, the length of the main span concrete beam in the bridge direction is more than twice of that of the side span concrete beam, the height of the main span concrete beam is smaller than that of the side span concrete beam, main span side piers and side span side piers for supporting the main span concrete beam and the side span concrete beam are respectively arranged at two ends of the lower concrete beam in the bridge direction, and swivel piers are arranged below the joint of the main span concrete beam and the side span concrete beam.
2. A bridge construction adapted for asymmetric swivels, according to claim 1, wherein: the main span concrete beam is a height-changing transition section in the length of one section of one end of the swivel pier, the height of the height-changing transition section from the main span concrete beam to the side span concrete beam is gradually increased, the height of the height-changing transition section close to one end of the main span concrete beam is the same as the height of the main span concrete beam, and the height of the height-changing transition section close to one end of the side span concrete beam is the same as the height of the side span concrete beam.
3. A bridge construction adapted for asymmetric swivels, according to claim 1, wherein: the main span concrete beam comprises main span concrete longitudinal beams arranged at two ends of the lower part of the bridge floor in the transverse direction of the bridge and a main span concrete cross beam connected between the two main span concrete longitudinal beams; the main span concrete cross beams are provided with a plurality of main span concrete cross beams which are distributed at equal intervals along the bridge direction.
4. A bridge construction adapted for asymmetric swivels, according to claim 1, wherein: the side span concrete beam is an integral concrete longitudinal beam with a solid rectangular cross section structure.
5. A bridge construction adapted for asymmetric swivels, according to claim 1, wherein: the upper portion steel truss is for holding formula truss structure down, including last chord member, web member and last tie-in, the last chord member has two, is located the bridge cross-bridge respectively to both ends, and arranges along extending along the bridge, it has a plurality of roots to go up the tie-in, connects between two last chord members, the web member has a plurality of roots, and connects into the cockscomb structure along following the bridge to head and the tail in order, the upper end and the last chord member of web member are connected, and the lower extreme and the lower part concrete beam of web member are connected.
6. A bridge construction adapted for asymmetric swivels, according to claim 5, wherein: the lower end of the web member is connected with a lower chord gusset plate, and the lower end of the lower chord gusset plate extends into the lower concrete beam and is connected with the lower concrete beam through a PBL key.
7. A bridge construction adapted for asymmetric swivels, according to claim 6, wherein: bolt holes are reserved in the part, extending into the lower concrete beam, of the lower chord node plate, and transverse steel bars of the lower concrete beam penetrate through the bolt holes and are fixed with the lower chord node plate through nuts.
8. A bridge construction adapted for asymmetric swivels, according to claim 6, wherein: the micro-expansion concrete anchoring blocks are poured at the joints of the bridge deck of the lower chord gusset plates, and the lower chord gusset plates are connected with the micro-expansion concrete anchoring blocks through studs.
9. A bridge construction adapted for asymmetric swivels, according to claim 1, wherein: and supports for supporting the lower concrete beam are arranged on the main span side pier, the side span side pier and the rotating piers, and a rotating assembly for rotating the bridge is arranged at the lower part of the rotating pier.
10. The construction method of a bridge structure suitable for an asymmetric swivel according to any one of claims 1 to 9, comprising the steps of:
1) completing the construction of the swivel pier, the main span side pier, the side span side pier and the swivel assembly, and prefabricating an upper steel truss segment;
2) erecting a cast-in-place support along the railway direction, and binding reinforcing steel bars of a lower concrete beam, wherein the end of the side span concrete beam faces one side of the existing bridge;
3) the method comprises the following steps of (1) casting a main span concrete beam and an edge span concrete beam in situ, embedding a lower chord gusset plate in the main span concrete beam and the edge span concrete beam, and performing temporary consolidation in a mode that vertical steel bars of a pier part extend into the concrete beam;
4) welding the upper steel truss section by section;
5) removing the cast-in-place support and then performing plane rotation;
6) after the turning is finished, a turning assembly on the turning pier is sealed, temporary consolidation reinforcing steel bars are cut off, jacking force is applied to a lower concrete beam on the main span side pier and the side span side pier, supports are installed on the main span side pier and the side span side pier, and negative counter force does not occur on the supports on the side span side pier after operation;
7) and (5) constructing a bridge deck pavement layer and an anti-collision guardrail on the bridge deck.
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