CN107558354B - Four-main-truss split-type plate truss and box truss combined main beam provided with tuyere - Google Patents
Four-main-truss split-type plate truss and box truss combined main beam provided with tuyere Download PDFInfo
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- CN107558354B CN107558354B CN201710866901.2A CN201710866901A CN107558354B CN 107558354 B CN107558354 B CN 107558354B CN 201710866901 A CN201710866901 A CN 201710866901A CN 107558354 B CN107558354 B CN 107558354B
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Abstract
The invention provides a four-main-truss split type plate truss and box truss combined girder for installing a tuyere, which comprises two double main truss structures, a transverse connection system and two tuyeres. The two double main truss structures are connected into a whole through a transverse connection system arranged between the two double main truss structures and are horizontally and symmetrically arranged; the two wind nozzles are respectively connected with the outer sides of the two double main truss structures, and each wind nozzle comprises an upper inclined web plate and a lower inclined web plate which are connected in a "<" shape; the transverse connection includes an upper beam, a lower beam, and a grid structure. In the double main girder structure, the road bridge deck system is a plate girder structure of a top plate of a steel-high performance concrete combined structure, and the railway bridge deck system is a box girder structure. The streamline split type girder section formed by the tuyere, the double main girder structure and the transverse connection system has the advantages of small wind resistance, good aerodynamic performance, high structural rigidity, high damping, good train operation safety and comfort, and good fatigue resistance of the road bridge deck, and meets the requirements of a large-span highway-railway dual-purpose bridge in typhoon areas.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a four-main-truss split type plate truss and box truss combined main beam for installing a tuyere.
Background
As the bridge position can be shared by the large-span highway and railway dual-purpose bridges, the land, the river and the space can be fully and reasonably utilized, and compared with the separately-built bridges, the cost in the aspects of materials and construction can be greatly saved, and the economy is good. In order to meet the requirements of navigation and reduce deep water foundations, cable-stayed bridges are mostly selected for the large-span highway-railway dual-purpose bridges, the main span of China exceeds 500m, all the highway-railway dual-purpose cable-stayed bridges adopt a steel truss girder scheme which is arranged in an up-down layered mode, and when four-wire railways are passed, all three main truss girders are adopted, such as a Wuhan Tianxing Zhou Yangtze bridge, a copper tom Yangtze bridge and a Shanghai through railway Yangtze bridge.
At present, the constructed large-span highway-railway dual-purpose cable-stayed bridge is positioned in large rivers and offshore areas, the main span of the bridge is relatively smaller, and the wind environment is relatively better. With the gradual perfection of traffic networks, the construction demands of the bridge with extra large span across the sea in the bay and strait are increasing. Building a bridge on a wide strait will face severe tests of environments such as severe geology, hydrology, weather and the like, and navigation requirements of 15 ten thousand tons and even 30 ten thousand tons of tankers. For example, planning and constructing a Jongzhou strait bridge, a Taiwan strait bridge and the like, the scheme of an oversized-span highway-railway dual-purpose bridge with a main span exceeding kilometers must be researched, the structural safety of the bridge under the action of 17-level super typhoons is solved, and meanwhile, the passing of trains under daily and general strong wind conditions is ensured. The traditional steel truss girder has large section wind resistance coefficient, the blunt body section has poorer aerodynamic performance, and the running wind speed threshold value of the train is lower.
The design of the main girder of the large-span highway-railway dual-purpose bridge crossing a bay and a strait faces the following four technical challenges:
(1) And the wind resistance is safe. In order to reduce the influence of wind force, the shape of the main beam is required to enable the main beam to have small static wind resistance and good pneumatic stability.
(2) The trains pass all the weather. In order to improve the operation efficiency of the train, the train can be ensured to safely operate under the condition of strong wind.
(3) The train is safe and comfortable to drive. The running safety and the comfort of the train are improved, and the bridge needs to have enough axial, vertical, transverse and torsional rigidity.
(4) And the road bridge deck is anti-fatigue. The traditional orthotropic steel bridge deck has outstanding fatigue problem and poor durability.
In summary, building a highway and railway dual-purpose bridge with an extra large span on the sea solves the technical problems of wind resistance safety, all-weather passing of trains, safety and comfort of train driving, fatigue resistance of highway bridge deck boards and the like, and needs to be innovated.
Disclosure of Invention
First, the technical problem to be solved
The invention provides a four-main-truss split type plate truss and box truss combined girder for installing a tuyere, which aims to solve the technical problems of wind resistance safety of a bridge, all-weather passing of a train, running safety and comfort of the train, fatigue resistance of a highway bridge deck and the like.
(II) technical scheme
In order to achieve the above object, the present invention provides a four main girder split type plate girder and box girder combined girder for installing a tuyere, the girder structure comprises:
the two double main truss structures are connected into a whole through a transverse connection system arranged between the two double main truss structures and are horizontally and symmetrically arranged as an integral stress structure;
the two wind nozzles are respectively connected with the outer sides of the two double main truss structures, each wind nozzle comprises an upper inclined web plate and a lower inclined web plate, and the upper inclined web plate and the lower inclined web plate are connected to form a "<" shape;
the transverse connection system is connected with the two double main truss structures at the left side and the right side and comprises an upper cross beam, a lower cross beam and a grid structure.
In the above scheme, the double main truss structure includes:
the side main trusses are arranged on the outer sides of the double main trusses, and the outer sides of the side main trusses are connected with the air nozzles;
the middle main truss is arranged on the inner sides of the two opposite double main truss structures and is connected with the transverse connection system;
the highway bridge deck system adopts a plate girder structure, is arranged between the side main girders and the middle main girders and is positioned at the top;
the railway bridge deck system adopts a box girder structure, is arranged between the side main girders and the middle main girders and is positioned at the bottom;
the cross-linked is arranged at the lower part of the road bridge deck system.
In the above scheme, in the double main truss structure,
the side main truss is a Hualun truss structure with vertical rods and comprises a side truss upper chord, a side truss lower chord, a side truss diagonal, side truss vertical rods and a side truss cable beam anchoring structure; the side truss cable beam anchoring structure is arranged at the top of the junction of the side truss upper chord, the side truss diagonal bar and the side truss vertical bar;
the middle main truss is a Huaren truss structure with vertical rods and comprises a middle truss upper chord, a middle truss lower chord, a middle truss diagonal, a middle truss vertical rod and a middle truss cable girder anchoring structure; the plane where the middle main truss is positioned is parallel to the plane where the side main truss is positioned, and the middle truss upper chord, the middle truss lower chord, the middle truss diagonal and the middle truss vertical rod are respectively parallel to the side truss upper chord, the side truss lower chord, the side truss diagonal and the side truss vertical rod of the side main truss; the middle truss cable girder anchoring structure is arranged at the top of the junction of the middle truss upper chord, the middle truss diagonal rod and the middle truss vertical rod.
The highway bridge deck system is connected with the upper chord of the side truss and the upper chord of the middle truss; the bridge deck comprises a top plate, longitudinal beams and cross beams, wherein the top plate is a bridge deck with a steel-high performance concrete combined structure which is formed by combining high-strength high-toughness concrete plates and steel bridge decks; the high-strength high-toughness concrete slab is poured on the top of the steel bridge deck plate, and the high-strength high-toughness concrete slab and the steel bridge deck plate are effectively connected through a shear connection key, wherein the thickness of the high-strength high-toughness concrete slab is 40-50 mm, and the thickness of the steel bridge deck plate is 14-20 mm;
the railway bridge deck system is connected with the lower chord of the side truss and the lower chord of the middle truss; adopting a steel structure or a steel-concrete combined structure;
the cross-connection is a truss structure adopting a plurality of delta-shaped horizontal connection, the top of the cross-connection is connected with a road bridge deck system, and two sides of the cross-connection are respectively connected with side truss vertical rods and middle truss vertical rods.
In the above aspect, the transverse connection system includes:
the upper cross beam is arranged on a horizontal plane with the same height as the upper chord of the middle truss and is vertical to the upper chord of the middle truss, and the junction of the upper chord of the middle truss and the vertical rod of the middle truss is connected with the upper chord of the middle truss;
the lower cross beam is arranged on a horizontal plane with the same height as the lower chord of the middle truss and is vertical to the lower chord of the middle truss, and the junction of the lower chord of the middle truss and the vertical rod of the middle truss is connected with the lower chord of the middle truss;
the grid structure is horizontally arranged and is arranged in a rectangular section formed by connecting two adjacent upper cross beams with the upper chord of the middle truss.
In the above scheme, in the tuyere:
the upper inclined web is connected with the upper chord of the side truss of the side main truss, and the included angle alpha between the upper chord and the horizontal plane is 20-40 degrees;
the lower inclined web connects the lower chord of the side main truss, and the included angle beta between the lower inclined web and the horizontal plane is 15-35 degrees.
In the above scheme, the horizontal clear distance inside the two double main trusses is B1, the height of each double main truss is H, the horizontal width of each tuyere is B3, and the determining conditions of the parameters B1, B3, H, α, β and ψ include:
a. the flutter critical wind speed of the bridge is larger than the flutter test wind speed;
b. the vertical and torsional vibration amplitude of the bridge vortex is smaller than the standard allowable value;
c. the running safety and comfort indexes of the train on the bridge meet the standard requirements;
d. and under the condition of meeting a, b and c, the engineering cost of the main beam is the lowest.
(III) beneficial effects
According to the technical scheme, the four-main-truss split type plate truss and box truss combined main beam provided with the tuyere has at least one of the following beneficial effects:
(1) The streamline split main beam section formed by the tuyere, the double main truss structure and the transverse connection system has small wind resistance and good aerodynamic performance;
(2) The railway track is arranged in a three-face closed space surrounded by the tuyere and the two double main truss structures, so that the influence of wind in the running process of the train is small, and the all-weather running of the train under the daily and general strong wind conditions can be ensured;
(3) The grid structure is arranged through the transverse connection system between the two double main truss structures, so that vortex in the air flow can be scattered, and vortex-induced vibration can be effectively restrained; the surface of the grating structure adopts sound absorption and energy consumption materials, so that the interference of lower railway track traffic noise on highway automobile traffic is reduced, and the highway traffic safety is facilitated;
(4) Because the four main trusses, the steel-mixed combined plate truss type highway bridge deck system, the box truss type railway bridge deck system, the transverse connection system and other main stress components are reasonably arranged, the axial rigidity, the vertical rigidity, the transverse rigidity and the torsional rigidity of the whole girder structure are all very large, and the damping is also higher, so that the safety and the comfort of train operation can be ensured;
(5) Because the highway bridge deck system adopts the combined bridge deck of high-strength high-toughness concrete and steel bridge deck, the overall rigidity of the bridge deck is high, and the damping is high, the fatigue resistance under the action of highway automobile load can be obviously improved, and the durability of bridge deck pavement can be improved.
Drawings
Fig. 1 is a schematic perspective view of a four main girder split type plate girder and box girder combined girder for installing a tuyere in an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a four main girder split type plate girder and box girder combined girder for installing a tuyere in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a three-dimensional structure of a double-main truss structure of a four-main truss split type plate truss and box truss combined main beam for installing a tuyere in an embodiment of the invention;
fig. 4 is a schematic view of three-dimensional structures of an edge main girder and a middle main girder of a four-main girder split type plate girder and box girder combined girder for installing a tuyere in the embodiment of the invention.
Fig. 5 is a schematic view of a deck system top plate of a highway, with four main girders split plate girders and box girders combined girders for installing tuyeres according to an embodiment of the present invention.
Fig. 6 is a schematic view of a transverse connection system of a four main girder split type plate girder and box girder combined girder for installing a tuyere in an embodiment of the present invention.
[ in the drawings, the main reference numerals of the embodiments of the present invention ]
1. A double main truss structure; 2. tuyere nozzle
3. A transverse connection; 4. edge main truss
5. A middle main truss; 6. road deck system
7. Railway deck systems; 8. transverse connection
9. The edge truss is wound up; 10. side truss lower chord
11. Side truss diagonal rods; 12. side truss vertical rod
13. An edge truss girder anchoring structure; 14. middle truss upper chord
15. The middle truss is lower chord; 16. middle truss diagonal bar
17. A middle truss vertical rod; 18. middle truss cable girder anchoring structure
19. A top plate; 20. high-strength high-toughness concrete plate
21. A steel bridge deck; 22. shear connector
23. An upper inclined web; 24. lower inclined web
25. An upper cross beam; 26. lower beam
27. A grid structure; 28. longitudinal beam
29. Cross beam
B1-horizontal clear distance of two double main truss structures; width of B2-double main truss structure
B3-tuyere width; height of H-double main truss structure
The included angle between the alpha-upper inclined web plate and the horizontal plane; and an included angle between the beta-declined web plate and the horizontal plane.
Detailed Description
The invention provides a four-main-truss split type plate truss and box truss combined girder for installing a tuyere. The two double main truss structures are horizontally and symmetrically arranged and are connected into a whole through a transverse connection system arranged between the two double main truss structures to serve as an integral stress structure. Each double main truss structure consists of an edge main truss, a middle main truss, a highway bridge deck system, a railway bridge deck system and a transverse connection. The outside of every two main joist structures all sets up a tuyere, and the tuyere comprises last oblique web and lower oblique web, goes up oblique web and lower oblique web and connects to be "<" shape, goes up the upper edge of oblique web and connects in the side joist upper chord of limit main joist, and the lower edge of lower oblique web connects in the side joist lower chord of limit main joist. The included angles alpha, beta between the upper inclined web plate, the lower inclined web plate and the horizontal plane are respectively between 20 degrees and 40 degrees and between 15 degrees and 35 degrees.
In the double main truss structure, the highway bridge deck system is positioned above the railway bridge deck system, the highway bridge deck system is a plate truss structure, the top plate of the highway bridge deck system adopts a combined bridge deck of high-strength high-toughness concrete plates and steel bridge deck plates, and the railway bridge deck system adopts a box truss structure. The streamline split type girder section formed by the tuyere, the double main girder structure and the transverse connection system has the advantages of small wind resistance, good aerodynamic performance, high structural rigidity, high damping, good train operation safety and comfort, and good fatigue resistance of the road bridge deck, and meets the requirements of a large-span highway-railway dual-purpose bridge in typhoon areas.
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Some embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
In a first exemplary embodiment of the present invention, a four main girder split type panel girder and box girder combined girder to which a tuyere is installed is provided. Fig. 1 is a schematic perspective view of a four main girder split type plate girder and box girder combined girder for installing a tuyere in a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a four main girder split type plate girder and box girder combined girder for installing a tuyere in an embodiment of the present invention. As shown in fig. 1-2, the four main girder split type plate girder and box girder combined girder for installing a tuyere of the present invention comprises: two double main trusses 1, a transverse connection 3 and two tuyeres 2.
The following describes in detail each component of the four main girder split type plate girder and the box girder combined girder of the tuyere mounting of this embodiment, respectively.
Referring to fig. 2, two double main trusses 1 are horizontally and symmetrically arranged, and the outer sides of the two double main trusses are provided with air nozzles 2. The two double main truss structures 1 are connected into a whole through a transverse connection system 3 arranged between the two double main truss structures, the inner side horizontal clear distance is B1 as an integral stress structure, the width of each double main truss structure 1 is B2, and the height is H.
Referring to fig. 3 and 4, each double main girder structure 1 comprises an edge main girder 4, a middle main girder 5, a road deck system 6, a railway deck system 7, and a cross-link 8. Referring to fig. 1 to 5, the side main girders 4 are arranged at the outer sides of the double main girders 1, and the outer sides are connected with the air nozzles 2; the middle main truss 5 is arranged on the inner sides of the two double main truss structures 1 opposite to each other and is connected with the transverse connection system (3); the road deck system 6 and the railway deck system 7 are arranged between the side main girders 4 and the middle main girders 5, and the road deck system 6 is arranged above the railway deck system 7, and a cross-link 8 is arranged below the road deck system 6. Wherein:
the side main truss 4 is a Hualun truss structure with vertical rods and comprises a side truss upper chord 9, a side truss lower chord 10, a side truss diagonal rod 11, a side truss vertical rod 12 and a side truss cable beam anchoring structure 13; the side truss cable beam anchoring structure 13 is arranged at the top of the connection part of the side truss upper chord 9, the side truss diagonal 11 and the side truss vertical rod 12;
the middle main truss 5 is a Huaren truss structure with vertical rods and comprises a middle truss upper chord 14, a middle truss lower chord 15, a middle truss diagonal 16, a middle truss vertical rod 17 and a middle truss cable girder anchoring structure 18; wherein, the plane of the middle main truss 5 is parallel to the plane of the side main truss 4, and the middle truss upper chord 14, the middle truss lower chord 15, the middle truss diagonal 16 and the middle truss vertical bar 17 of the middle main truss 5 are respectively parallel to the side truss upper chord 9, the side truss lower chord 10, the side truss diagonal 11 and the side truss vertical bar 12 of the side main truss 4; the middle truss cable girder anchoring structure 18 is arranged on top of the joints of the middle truss upper chord 14, the middle truss diagonal 16 and the middle truss vertical rod 17.
The highway bridge deck system 6 is connected with the side truss upper chord 9 and the middle truss upper chord 14; the bridge deck comprises a top plate 19, longitudinal beams 28 and cross beams 29, wherein the top plate 19 is a bridge deck with a steel-high performance concrete combined structure adopting a high-strength high-toughness concrete slab 20 and a steel bridge deck 21; the high-strength high-toughness concrete slab 20 is poured on the top of the steel bridge deck 21, and the high-strength high-toughness concrete slab 20 and the steel bridge deck 21 are effectively connected through the shear connection key 22, wherein the thickness of the high-strength high-toughness concrete slab 20 is 40-50 mm, and the thickness of the steel bridge deck 21 is 14-20 mm;
the railway bridge deck system 7 is connected with the side truss lower chord 10 and the middle truss lower chord 15; adopting a steel structure or a steel-concrete combined structure;
the cross-connection 8 is a truss structure adopting a plurality of delta-shaped horizontal connection, the top of the cross-connection is connected with the road bridge deck system 6, and two sides of the cross-connection are respectively connected with the side truss vertical rods 12 and the middle truss vertical rods 17.
Referring to fig. 2 and 3, two wind nozzles 2 are respectively connected with the outer sides of two double main truss structures 1, and are composed of an upper inclined web plate and a lower inclined web plate, the upper inclined web plate and the lower inclined web plate are connected to form a "<", the horizontal width of the wind nozzle is B3, the upper inclined web plate 23 is connected with the upper chord 9 of the side truss, the lower inclined web plate 24 is connected with the lower chord 10 of the side truss, the included angle alpha between the upper inclined web plate 23 and the horizontal plane is between 20 degrees and 40 degrees, and the included angle beta between the lower inclined web plate 24 and the horizontal plane is between 15 degrees and 35 degrees.
Referring to fig. 1, 3 and 6, the transverse connection system 3 includes an upper beam 25, a lower beam 26 and a grid structure 27, wherein the upper beam 25 is disposed at a level equal to the upper chord 14 of the middle truss and is perpendicular to the upper chord 14 of the middle truss, and is connected to the upper chord 14 of the middle truss at the junction of the upper chord 14 of the middle truss and the vertical rod 17 of the middle truss; the lower cross beam 26 is arranged on the horizontal plane with the same height as the middle truss lower chord 15 and is vertical to the middle truss lower chord 15, and is connected with the middle truss lower chord 15 at the junction of the middle truss lower chord 15 and the middle truss vertical rod 17; the grid structure 27 is horizontally arranged and is arranged in a rectangular section formed by connecting two adjacent upper cross beams 25 with the middle truss upper chord 14. A grid structure 27 may be provided in the rectangular section defined by the lower cross member 26 and the center sill lower chord 15. The ventilation rate psi of the grid structure 27 takes a value within a range of 40% -80%; the surface of the grille structure 27 is made of sound absorbing and energy dissipating materials, so that noise generated during train operation is reduced to interfere with automobile drivers on the road bridge deck.
Referring to fig. 1 to 5, the determination criteria of parameters B1, B3, α, β, ψ and the like are:
a. the flutter critical wind speed of the bridge is larger than the flutter test wind speed;
b. the vertical and torsional vibration amplitude of the bridge vortex is smaller than the standard allowable value;
c. the running safety and comfort indexes of the train on the bridge meet the standard requirements;
d. and under the condition of meeting a, b and c, the engineering cost of the main beam is the lowest.
The four-main-truss split type plate truss and box truss combined main beam provided with the tuyere has the advantages of high rigidity, good wind resistance, good train operation safety and comfort, good fatigue resistance of the road bridge deck, capability of ensuring all-weather passing of the train and suitability for large-span highway and railway dual-purpose bridges in typhoon frequent areas.
Thus, the four main girder split type plate girder and box girder combined girder for installing the tuyere in the first embodiment of the invention is introduced.
Thus, embodiments of the present invention have been described in detail with reference to the accompanying drawings. It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the elements and methods are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.
It should be noted that, in the embodiments, directional terms, such as "upper", "lower", "front", "rear", "left", "right", etc., refer to the directions of the drawings only, and are not intended to limit the scope of the present invention. Like elements are denoted by like or similar reference numerals throughout the drawings. Conventional structures or constructions will be omitted when they may cause confusion in understanding the present invention.
And the shapes and dimensions of the various elements in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of embodiments of the present invention. In addition, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise known, the numerical parameters in this specification and the attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The use of ordinal numbers such as "first," "second," "third," etc., in the description and the claims to modify a corresponding element does not by itself connote any ordinal number of elements or the order of manufacturing or use of the ordinal numbers in a particular claim, merely for enabling an element having a particular name to be clearly distinguished from another element having the same name.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (5)
1. Four main joist split type plate joists and box joist combined main beam of installation tuyere, include:
two double main truss structures (1), the double main truss structures (1) comprising:
the side main trusses (4) are arranged at the outer sides of the double main truss structures (1), and the outer sides of the side main trusses are connected with the air nozzles (2);
the middle main trusses (5) are arranged on the inner sides of the two double main trusses (1) opposite to each other and are connected with the transverse connection system (3);
the highway bridge deck system (6) adopts a plate girder structure, is arranged between the side main girders (4) and the middle main girders (5) and is positioned at the top;
the railway bridge deck system (7) adopts a box girder structure, is arranged between the side main girders (4) and the middle main girders (5) and is positioned at the bottom;
the cross-over connection (8) is arranged at the lower part of the highway bridge deck system (6);
is connected into a whole through a transverse connection system (3) arranged between the two, and is arranged horizontally and symmetrically as an integral stress structure;
the two air nozzles (2) are respectively connected with the outer sides of the two double main truss structures (1), each air nozzle (2) comprises an upper inclined web plate (23) and a lower inclined web plate (24), and the upper inclined web plate (23) and the lower inclined web plate (24) are connected to form a <' >;
the transverse connection system (3), the left and right sides are connected with two main truss structures (1), include:
the upper cross beam (25) is arranged on the horizontal plane with the same height as the middle truss upper chord (14) and is perpendicular to the middle truss upper chord (14), and the junction of the middle truss upper chord (14) and the middle truss vertical rod (17) is connected with the middle truss upper chord (14);
the lower cross beam (26) is arranged on a horizontal plane with the same height as the middle truss lower chord (15) and is perpendicular to the middle truss lower chord (15), and is connected with the middle truss lower chord (15) at the junction of the middle truss lower chord (15) and the middle truss vertical rod (17);
the grid structure (27) is horizontally arranged and is arranged in a rectangular section formed by connecting two adjacent upper cross beams (25) with the upper chord (14) of the middle truss.
2. The four-main-truss split-type plate truss and box truss combined main girder according to claim 1, wherein in the double main truss structure (1),
the side main truss (4) is a Hualun truss structure with vertical rods and comprises a side truss upper chord (9), a side truss lower chord (10), a side truss diagonal (11), a side truss vertical rod (12) and a side truss cable beam anchoring structure (13); the side truss cable beam anchoring structure (13) is arranged at the top of the joint of the side truss upper chord (9), the side truss diagonal (11) and the side truss vertical rod (12);
the middle main truss (5) is a Hualun truss structure with vertical rods, and comprises a middle truss upper chord (14), a middle truss lower chord (15), a middle truss diagonal (16), a middle truss vertical rod (17) and a middle truss cable girder anchoring structure (18); the plane where the middle main truss (5) is positioned is parallel to the plane where the side main truss (4) is positioned, and the middle truss upper chord (14), the middle truss lower chord (15), the middle truss diagonal (16) and the middle truss vertical bar (17) of the middle main truss (5) are respectively parallel to the side truss upper chord (9), the side truss lower chord (10), the side truss diagonal (11) and the side truss vertical bar (12) of the side main truss (4); the middle truss cable girder anchoring structure (18) is arranged at the top of the joint of the middle truss upper chord (14), the middle truss diagonal (16) and the middle truss vertical rod (17);
the highway bridge deck system (6) is connected with the side truss upper chord (9) and the middle truss upper chord (14); the bridge deck comprises a top plate (19), longitudinal beams (28) and cross beams (29), wherein the top plate (19) is a bridge deck with a steel-high performance concrete combined structure which is formed by combining a high-strength high-toughness concrete slab (20) and a steel bridge deck (21); the high-strength high-toughness concrete slab (20) is poured on the top of the steel bridge deck (21), and the high-strength high-toughness concrete slab and the steel bridge deck are effectively connected through a shear connection key (22), wherein the thickness of the high-strength high-toughness concrete slab (20) is 40-50 mm, and the thickness of the steel bridge deck (21) is 14-20 mm;
the railway bridge deck system (7) is connected with the side truss lower chord (10) and the middle truss lower chord (15); adopting a steel structure or a steel-concrete combined structure;
the cross-linked (8) is a truss structure adopting a plurality of delta horizontal connections, the top of the cross-linked is connected with the road bridge deck system (6), and two sides of the cross-linked are respectively connected with the side truss vertical rods (12) and the middle truss vertical rods (17).
3. The four-main-truss split type plate truss and box truss combined main beam according to claim 2, wherein the ventilation rate psi of the grid structure (27) is 40% -80%, and the surface of the grid structure (27) is made of sound absorption energy consumption materials.
4. The four main girder split type plate girder and box girder combined girder according to claim 1, wherein:
the upper inclined web (23) is connected with an upper chord (9) of the side main truss (4), and an included angle alpha between the upper chord and the horizontal plane is 20-40 degrees;
the lower inclined web (24) is connected with the lower chord (10) of the side main truss (4), and the included angle beta between the lower chord and the horizontal plane is 15-35 degrees.
5. The four-main-truss split-type plate truss and box truss combined main girder according to claim 1, wherein the inner horizontal clear distance of the two double main truss structures (1) is B1, the height of each double main truss structure (1) is H, the horizontal width of each tuyere (2) is B3, and the determination conditions of parameters B1, B3, H, α, β and ψ include:
a. the flutter critical wind speed of the bridge is larger than the flutter test wind speed;
b. the vertical and torsional vibration amplitude of the bridge vortex is smaller than the standard allowable value;
c. the running safety and comfort indexes of the train on the bridge meet the standard requirements;
d. and under the condition of meeting a, b and c, the engineering cost of the main beam is the lowest.
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