CN112796196B - Bridge structure suitable for asymmetric swivel and construction method thereof - Google Patents
Bridge structure suitable for asymmetric swivel and construction method thereof Download PDFInfo
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- CN112796196B CN112796196B CN202110072676.1A CN202110072676A CN112796196B CN 112796196 B CN112796196 B CN 112796196B CN 202110072676 A CN202110072676 A CN 202110072676A CN 112796196 B CN112796196 B CN 112796196B
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- 238000010276 construction Methods 0.000 title claims description 21
- 239000004567 concrete Substances 0.000 claims abstract description 187
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 230000007704 transition Effects 0.000 claims description 12
- 238000011065 in-situ storage Methods 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 238000007596 consolidation process Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000005452 bending Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 2
- 241000561734 Celosia cristata Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 210000001520 comb Anatomy 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
- 239000003973 paint Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a bridge structure suitable for an asymmetric swivel, 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 trusses; the lower concrete beam comprises a main span concrete beam and side span concrete beams, the forward bridge length of the main span concrete beam is more than twice 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, the forward bridge of the lower concrete beam is provided with main span side piers and side span side piers at two ends, and a swivel pier is arranged below the joint of the main span concrete beam and the side span concrete beam. The invention adopts the upper steel truss as the main stress structure, fully exerts the light and high strength characteristics of the steel structure, simultaneously adopts the reinforced concrete structure for the lower concrete beam and the bridge deck, is used for bearing the axial pressure of the bridge, fully exerts the advantage of good compression resistance of the concrete, and meets 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 construction, and particularly relates to a bridge structure suitable for asymmetric turning and a construction method thereof, which are mainly used for crossing roads and municipal roads and other structures and are constructed in a plane turning mode.
Background
The planar turning method is a preferred construction mode when a newly built road and municipal road and bridge cross a railway and a high-grade road at present because the influence time of the planar turning method on the crossing building is short, convenient and quick. The unbalanced bending moment generated by the different dead weights of the two side beams can not be resisted by the spherical hinge of the swivel, so that T-shaped rigid frames or cable-stayed bridges with symmetrical and equal spans are generally adopted to realize balanced swivel.
However, symmetrical swivels also have a large limitation: (1) When the existing road (bridge) is widened, the side span is required to be as long as the main span, and the newly-built bridge in front of the swivel is required to be prefabricated perpendicular to the existing bridge, so that the newly-built bridge is far away from the existing bridge, the land feature area is large, and the road plane line shape condition is not ideal; (2) When a building is arranged in a near range of one side of the newly-built bridge, the building in the influence range needs to be dismantled in order to meet the prefabrication (pouring) condition of the beam body before turning. When the building is difficult to disassemble, the symmetrical swivel is not in practical condition.
If a certain bridge form can be adopted, the structure is asymmetric, namely the main span length is larger, the side span length is smaller, but the balance swivel can be realized by adjusting the dead weight of the main span and the side span to balance the bending moment of the swivel piers and the spherical hinges, so that 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 disassembly 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 deck to the beam bottom is far smaller than that of the prestressed concrete continuous beam, so that the longitudinal slope of the overpass 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 paint the steel structure of the bottom chord and the bridge deck system when the steel truss is used to span the structures such as railways, and the steel truss is very dangerous to work on the railway contact network.
Disclosure of Invention
The invention aims to provide a bridge structure suitable for an asymmetric swivel, which at least can solve part of defects in the prior art.
In order to achieve the above object, the present invention provides a bridge structure adapted for an asymmetric swivel, comprising a deck, an upper steel truss connected to an upper portion of the deck, and a lower concrete beam connected to a lower portion of the deck; the lower concrete beam comprises a main span concrete beam and an edge span concrete beam, the longitudinal length of the main span concrete beam is more than twice that of the edge span concrete beam, the height of the main span concrete beam is smaller than that of the edge span concrete beam, main span side piers and edge span side piers for supporting the main span concrete beam and the edge span concrete beam are respectively arranged at the two ends of the lower concrete beam along the longitudinal length of the main span concrete beam, and swivel piers are arranged below the joint of the main span concrete beam and the edge span concrete beam.
Further, the main span concrete beam is a variable-height transition section in one internode length of one end of the swivel pier, the variable-height transition section gradually increases from the main span concrete beam to the side span concrete beam, the height of the variable-height transition section, which is 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, which is close to one end of the side span concrete beam, is the same as the height of the side span concrete beam.
Further, the main span concrete beam comprises main span concrete longitudinal beams arranged at two ends of a transverse bridge at the lower part of the bridge deck and main span concrete cross beams connected between the two main span concrete longitudinal beams; the main span concrete beams are distributed at equal intervals along the forward bridge direction.
Further, the side span concrete beam adopts an integral concrete longitudinal beam with a solid rectangular cross section structure.
Further, upper portion steel truss is down holds formula truss structure, including top chord member, web member and upper parallel connection, the top chord member has two, is located bridge cross bridge respectively to both ends, and along the bridge to extending arrangement, upper parallel connection has a plurality of, connects between two top chord members, the web member has a plurality of, and along the bridge to connecting into the cockscomb structure in order from beginning to end, the upper end and the top chord member of web member are connected, and the lower extreme and the lower part concrete beam of web member are connected.
Further, the lower end of the web member is connected with a lower chord node plate, and the lower end of the lower chord node plate extends into the lower concrete beam and is connected with the lower concrete beam through a PBL key.
Further, bolt holes are reserved on the portion, extending into the lower portion of the concrete beam, of the lower portion of the concrete beam, transverse reinforcing steel bars penetrate through the bolt holes, and the lower portion of the concrete beam is fixed with the lower chord node plates through nuts.
Further, the lower chord node plate is poured with a micro-expansion concrete anchoring block at the bridge deck connection part, and the lower chord node plate is connected with the micro-expansion concrete anchoring block through a bolt.
Further, the main span side pier, the side span side pier and the swivel pier are respectively provided with a support for supporting the concrete beam at the lower part, and the lower part of the swivel pier is provided with a swivel assembly for a bridge swivel.
In addition, the invention also provides a construction method of the bridge structure suitable for the asymmetric swivel, which comprises the following steps:
1) Finishing construction of the swivel piers, the main span side piers, the side span side piers and the swivel assembly, and simultaneously, prefabricating the upper steel truss sections;
2) Erecting a cast-in-situ bracket along the railway direction, and binding reinforcing steel bars of the lower concrete beam, wherein the side span concrete beam end faces one side of the existing bridge;
3) The cast-in-situ main span concrete beam and the side span concrete beam are pre-buried with lower chord node plates, and temporary consolidation is carried out by adopting a mode that vertical steel bars of the pier part extend into the concrete beam;
4) Welding an upper steel truss section by section;
5) Removing the cast-in-situ bracket and then carrying out plane rotation;
6) After the swivel is completed, sealing a swivel assembly on the swivel pier, cutting off temporary consolidation reinforcing steel bars, applying a jacking force to lower concrete beams on the main span side pier and the side span side pier, and installing supports on the main span side pier and the side span side pier to ensure that no negative reaction force exists 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 the steel-concrete truss combined two-span continuous beam structure, the upper steel truss is used as a main stress structure, the light and high strength characteristics of the steel structure are fully exerted, meanwhile, the lower concrete beam and the bridge deck system adopt reinforced concrete structures for bearing the axial pressure of the bridge, the advantage of good concrete compression resistance is fully exerted, maintenance and coating are not needed, and the moment balance of a main span and a side span dead weight relative swivel pier in a swivel stage is met by adjusting the height and the thickness of the side span concrete beam, so that the asymmetric balanced swivel is realized.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic plan view of a bridge structure of the present invention;
FIG. 2 is an elevational schematic of the bridge construction of the present invention;
FIG. 3 is a schematic cross-sectional view of a main span concrete beam of the present invention;
FIG. 4 is a schematic cross-sectional view of a side-span concrete beam of the present invention;
FIG. 5 is a schematic elevation view of the connection node of the upper steel truss and the lower concrete beam in the present invention;
fig. 6 is a schematic cross-sectional view of the connection node of the upper steel truss and the lower concrete beam in the present invention.
Reference numerals illustrate: 1. bridge deck; 2. an upper steel truss; 3. an upper chord; 4. a web member; 5. side span and side pier; 6. side span concrete beams; 7. a swivel assembly; 8. a swivel pier; 9. a transition section of variable height; 10. a main span concrete beam; 11. a main span side pier; 12. a support; 13. a main span concrete stringer; 14. a main span concrete beam; 15. flatly connecting the upper parts; 16. a lower chord node plate; 17. a peg; 18. bolt holes; 19. and (3) a micro-expansion concrete anchoring block.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should 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 the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements 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 invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
As shown in fig. 1 and 2, the present embodiment provides a bridge structure suitable for an asymmetric swivel, comprising a deck 1, an upper steel truss 2 connected to the upper portion of the deck 1, and a lower concrete beam connected to the 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 forward bridge length of the main span concrete beam 10 is more than twice 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, the forward bridge ends of the lower concrete beam are respectively provided with a main span side pier 11 and a side span side pier 5 for supporting the main span concrete beam 10 and the side span concrete beam 6, and a swivel pier 8 is arranged below the joint of the main span concrete beam 10 and the side span concrete beam 6. According to the embodiment, a two-span asymmetric structure is adopted, the span of the main span concrete beam 10 is larger, the span of the side span concrete beam 6 is smaller, the limitation of symmetrical swivel can be solved to a certain extent through the asymmetric structure, and the position of a newly-built bridge is as close to the existing bridge as possible, or the disassembly can be reduced as much as possible; if the same cross section is adopted when the main span and the side span are asymmetric, the main span and the side span are required to bear the bending moment action, and the risk of overturning and incapability of rotating exists for the swivel system, and in order to ensure the safety of the swivel system, in the embodiment, the moment generated by the upper structures on the left side and the right side of the swivel pier 8 is equal by adjusting the height and the thickness of the side span concrete beam 6, so that the asymmetric balance swivel can be realized.
In this embodiment, the upper steel truss 2 is used as the main stress structure, so that the characteristics of light weight and high strength of the steel structure are fully exerted, meanwhile, the lower concrete beam and the bridge deck system adopt reinforced concrete structures for bearing the axial pressure of the bridge, so that the advantage of good concrete compression resistance is fully exerted, and in the rotating stage, the upper steel truss 2 is mainly tensioned, while the lower concrete beam is mainly compressed.
Further, the main span concrete beam 10 is a transition section 9 with a height gradually increasing from the main span concrete beam 10 to the side span concrete beam 6 within one internode length at one end of the swivel pier 8, the height of the transition section 9 near one end of the main span concrete beam 10 is the same as that of the main span concrete beam 10, and the height near one end of the side span concrete beam 6 is the same as that of the side span concrete beam 6; through the design of the structure of the transition section 9 with variable height, the height difference between the main span concrete beam 10 and the side span concrete beam 6 is adjusted in a smooth transition mode, the stability of stress is guaranteed, the weight of the side span is increased, and the moment balance of the main span and the side span dead weight relative to the turning pier in the turning stage is met.
For one embodiment of the lower concrete beam, as shown in fig. 3, the main span concrete beam 10 includes main span concrete stringers 13 provided at both ends of the lower lateral bridge of the deck 1, and main span concrete beams 14 connected between the two main span concrete stringers 13; the main span concrete beams 14 are distributed at equal intervals along the bridge direction, and the main span concrete longitudinal beams 13 and the main span concrete beams 14 form a lattice system, wherein the main span concrete longitudinal beams 13 and the main span concrete beams 14 are of solid rectangular cross-section structures. As shown in fig. 4, the side span concrete beam 6 adopts a solid rectangular cross-sectional structure of an integral concrete girder. The lower concrete beam of this embodiment adopts ordinary reinforced concrete structure, does not set up prestressed reinforcement.
For a concrete implementation mode of the upper steel truss 2, a lower bearing truss structure is adopted in the embodiment, the height from the bridge deck to the beam bottom is small, road longitudinal slopes are reduced, technical economy is good, and in particular, two steel trusses are arranged in the transverse bridge direction of the bridge structure, the two steel trusses comprise two upper chord members 3, web members 4 and an upper parallel connection 15, the two upper chord members 3 are respectively positioned at two ends of the bridge transverse bridge direction and are arranged along the longitudinal bridge direction, and the upper chord members 3 are steel plates with box-shaped sections; the upper flat joints 15 are connected between the two upper chords 3, and the upper flat joints 15 are made of steel plates with I-shaped cross sections; the web members 4 are connected in sequence along the bridge to form a zigzag shape, the web members 4 are steel plates with I-shaped 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 beams. All-welded structures are adopted among all members of the upper steel truss 2, and the stress structure of the bridge can be adjusted by controlling the internode length and the member rigidity of the upper steel truss 2, so that prestress is not required when the lower concrete beam adopts a reinforced concrete structure.
The connection mode between the upper steel truss 2 and the lower concrete beam is further thinned, and the lower concrete beam and the upper steel truss structure above the bridge deck 1 are parallel to railway construction in a bracket cast-in-situ and spliced mode. As shown in fig. 5 and 6, the lower end of the web member 4 is connected with a lower chord node plate 16, the lower chord node plate 16 is made of a steel plate, and the lower end of the lower chord node plate 16 extends into the lower concrete beam and is connected with the lower concrete beam through a PBL key. Optimally, bolt holes 18 are reserved on the part of the lower chord node plate 16 extending into the lower concrete beam, 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 the connection stability of the upper steel truss 2 and the lower concrete beam is further improved.
Further, the micro-expansion concrete anchoring block 19 is poured at the joint of the bridge deck 1 of the lower chord node plate 16, and the lower chord node plate 16 is connected with the micro-expansion concrete anchoring block 19 through the bolt 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 swivel pier 8 are all provided with supports 12 for supporting lower concrete beams, the swivel assembly 7 for a bridge swivel is arranged at the lower part of the swivel pier 8, namely, swivel construction is carried out in a pier bottom swivel mode, the swivel assembly 7 adopts swivel devices such as spherical hinges, the concrete structure of the swivel assembly is the prior art, and details are not repeated here.
The concrete construction process of the bridge structure suitable for the asymmetric swivel is as follows:
(1) Finishing construction of the swivel piers 8, the main span side piers 11, the side span side piers 5 and the swivel assembly 7, simultaneously, prefabricating upper steel truss sections in a factory, and transporting the upper steel truss sections to a construction site;
(2) Erecting a cast-in-situ bracket along the railway direction, and binding the steel bars of the lower concrete beam, wherein the end of the side span concrete beam 6 faces to one side of the existing bridge;
(3) The cast-in-situ main span concrete beam 10 and the side span concrete beam 6 are pre-buried with a lower chord gusset plate 16, and temporary consolidation is carried out by adopting a mode that the vertical steel bars of the pier part extend into the concrete beam;
(4) Welding the upper steel truss 2 section by section;
(5) Removing the cast-in-situ bracket and then carrying out plane rotation;
(6) After the swivel is completed, the swivel assembly 7 on the swivel pier 8 is sealed, temporary consolidation reinforcing steel bars are sheared off, a jacking force is applied to the lower concrete beams on the main span side pier 11 and the side span side pier 5, and the support 12 is arranged on the main span side pier 11 and the side span side pier 5, so that no negative reaction force is generated on the support 12 on the side span side pier 5 after operation;
(7) And (3) constructing a bridge deck pavement layer and an anti-collision guardrail on the bridge deck 1.
The lower bearing type steel-concrete combined truss continuous beam bridge with the span of (43+20) m is constructed by crossing 2 railway lines on a road of a certain scenic spot, and a swivel mode is adopted for construction. The right side of the newly-built bridge is provided with an existing road bridge, and the newly-built bridge needs to be close to the existing road bridge as much as possible according to the requirement of scenic spot planning; the specific design is as follows:
Two steel trusses at the upper part of the full bridge are transversely arranged, the distance between the two steel trusses is 1020cm, the truss height is 700cm, and the truss internode length is 600cm. The upper chord member is 500X 500mm of box section, and the thickness of the steel plate is 16-24 mm; the web member is an I-shaped section 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 16mm.
The two concrete bottom chords (namely the main span concrete longitudinal beam) of the main span concrete beam are solid rectangular sections with the length of 800 multiplied by 800mm, the main span concrete transverse beam is solid rectangular sections with the length of 800mm, the spacing is 1500mm, and the longitudinal beam and the transverse beam form a lattice system. The side span concrete beam adopts an integral concrete longitudinal beam, the solid section is a beam with the height of 200cm and the bottom width of 1100cm. The lower concrete beam adopts a common reinforced concrete structure, and no prestressed reinforcement is arranged.
The upper steel truss is connected with the lower concrete beam through a lower chord gusset plate, the longitudinal length of the lower chord gusset plate is 2400mm, the lower chord gusset plate vertically stretches into the lower concrete beam for 640mm, double rows of bolt holes are formed in the lower chord gusset plate, and transverse steel bars of the lower concrete beam penetrate through the bolt holes of the lower chord gusset plate and are fixed through nuts. The lower chord gusset plate is provided with post-cast micro-expansion concrete anchoring blocks with the height of 400m on the top surface of the concrete beam, and is connected with the concrete through bolts.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (7)
1. Bridge structure suitable for asymmetric rotation, its characterized in that: the bridge deck 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 an edge span concrete beam, the forward bridge length of the main span concrete beam is more than twice that of the edge span concrete beam, the height of the main span concrete beam is smaller than that of the edge span concrete beam, a main span edge pier and an edge span edge pier for supporting the main span concrete beam and the edge span concrete beam are respectively arranged at the forward bridge ends of the lower concrete beam, a swivel pier is arranged below the joint of the main span concrete beam and the edge span concrete beam, and a swivel component for a bridge swivel is arranged at the lower part of the swivel pier;
The main span concrete beam is a variable-height transition section in one internode length at one end of the swivel pier, the variable-height transition section gradually increases from the main span concrete beam to the side span concrete beam, the height of the variable-height transition section at one end, which is close to the main span concrete beam, is the same as the height of the main span concrete beam, and the height of the variable-height transition section at one end, which is close to the side span concrete beam, is the same as the height of the side span concrete beam;
The main span concrete beam comprises main span concrete longitudinal beams arranged at two ends of a transverse bridge at the lower part of the bridge deck and main span concrete cross beams connected between the two main span concrete longitudinal beams; the main span concrete beams are distributed at equal intervals along the forward bridge direction; the side span concrete beam adopts an integral concrete longitudinal beam with a solid rectangular cross section structure.
2. A bridge construction adapted for use with an asymmetric swivel as claimed in claim 1, wherein: the upper steel truss is of a lower bearing truss structure and comprises two upper chords, web members and an upper parallel connection, wherein the two upper chords are respectively located at two ends of a bridge transverse bridge and are arranged along the bridge in a extending mode, the upper parallel connection is provided with a plurality of upper chords, the web members are connected between the two upper chords, the web members are sequentially connected into a saw-tooth shape along the bridge to the head and the tail, the upper ends of the web members are connected with the upper chords, and the lower ends of the web members are connected with lower concrete beams.
3. A bridge construction adapted for use with an asymmetric swivel as claimed in claim 2, wherein: the lower end of the web member is connected with a lower chord node plate, and the lower end of the lower chord node plate extends into the lower concrete beam and is connected with the lower concrete beam through a PBL key.
4. A bridge construction adapted for use with an asymmetric swivel as claimed in claim 3, wherein: the lower chord gusset plate extends into the lower concrete beam part to form a bolt hole, and transverse reinforcing steel bars of the lower concrete beam penetrate through the bolt hole and are fixed with the lower chord gusset plate through nuts.
5. A bridge construction adapted for use with an asymmetric swivel as claimed in claim 3, wherein: the lower chord node plate is poured with a micro-expansion concrete anchoring block at the joint of the bridge deck, and the lower chord node plate is connected with the micro-expansion concrete anchoring block through a bolt.
6. A bridge construction adapted for use with an asymmetric swivel as claimed in claim 1, wherein: and the main span side pier, the side span side pier and the swivel pier are respectively provided with a support for supporting the lower concrete beam.
7.A construction method of a bridge structure adapted for an asymmetric swivel according to any one of claims 1 to 6, comprising the steps of:
1) Finishing construction of the swivel piers, the main span side piers, the side span side piers and the swivel assembly, and simultaneously, prefabricating the upper steel truss sections;
2) Erecting a cast-in-situ bracket along the railway direction, and binding reinforcing steel bars of the lower concrete beam, wherein the side span concrete beam end faces one side of the existing bridge;
3) The cast-in-situ main span concrete beam and the side span concrete beam are pre-buried with lower chord node plates, and temporary consolidation is carried out by adopting a mode that vertical steel bars of the pier part extend into the concrete beam;
4) Welding an upper steel truss section by section;
5) Removing the cast-in-situ bracket and then carrying out plane rotation;
6) After the swivel is completed, sealing a swivel assembly on the swivel pier, cutting off temporary consolidation reinforcing steel bars, applying a jacking force to lower concrete beams on the main span side pier and the side span side pier, and installing supports on the main span side pier and the side span side pier to ensure that no negative reaction force exists 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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| CN115748413A (en) * | 2022-11-25 | 2023-03-07 | 中铁十局集团第四工程有限公司 | Continuous steel truss web-plate truss double-layer combined swivel bridge structure |
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