CN107558354A - The split type plate girder of four main trusses and case purlin combination girder of tuyere are installed - Google Patents
The split type plate girder of four main trusses and case purlin combination girder of tuyere are installed Download PDFInfo
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- CN107558354A CN107558354A CN201710866901.2A CN201710866901A CN107558354A CN 107558354 A CN107558354 A CN 107558354A CN 201710866901 A CN201710866901 A CN 201710866901A CN 107558354 A CN107558354 A CN 107558354A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a kind of split type plate girder of four main trusses for installing tuyere and case purlin combination girder, including two double main truss structure, a lateral connection system and two tuyeres.Two double main truss structures, net level length, by setting lateral connection system therebetween to connect as one, are arranged from B1 in horizontal symmetrical；Two tuyeres, be connected respectively with the outside of two double main truss structures, each tuyere include be in "<" shape connection upper skew web plate and lower skew web plate；Lateral connection system includes entablature, sill and cell structure.In double main truss structures, highway bridge system is the sheet stringer structure of steel high performance concrete combining structure top plate, and railway deck system is case purlin structure.The streamlined split type girder section formed by tuyere, double main truss structures, lateral connection system, windage is small, aeroperformance is good, and the rigidity of structure is big, damping is high, train operational safety and comfortableness are good, highway bridge anti-fatigue performance is good, meets the needs of typhoon region large span road-cum-rail bridge.
Description
Technical field
The present invention relates to technical field of bridge engineering, the split type plate girder of four main trusses and case purlin for specially installing tuyere combine
Girder.
Background technology
Large span road-cum-rail bridge is due to that can share bridge location, sufficiently and reasonably using soil, river and space, with dividing
Bridge construction beam is compared, and can greatly save the expense in terms of material and construction, has good economy.And be to meet navigation,
Deep water foundation is reduced, large span road-cum-rail bridge selects cable-stayed bridge more, and China's main span exceedes 500m highway and railway bi-purpose cable-stayed bridge
The steel truss girder scheme of upper and lower layered arrangement is all employed, and when current four-track line, all employs three main truss girders, such as Wuhan
Tianxingzhou Yangtse Bridge, Tongling Yangtze Bridge, Shanghai lead to the railway Yangtze Bridge.
At present, the long span combined road and railway cable-stayed bridge built is respectively positioned on great rivers and offshore area, bridge main across
Across footpath is relatively small, and wind environment is relatively preferable.With the gradual perfection of transportation network, across the Super-Long Span over strait in bay, straits
Footpath bridge construction demand is increasing.Constructed a bridge on broad straits, the environment such as severe geology, the hydrology, meteorology will be faced
Baptism, and the navigation requirement of 150,000 tons of even 300,000 tons of oil tankers.Qiongzhou Strait bridge, Chinese platform such as planning construction
Gulf strait Bridge etc., it is necessary to study the large span road-cum-rail bridge scheme of the super km of main span, and it is super at 17 grades to solve bridge
Structure safety under violent typhoon effect, while ensure that train is current under daily and general windy conditions.Traditional steel truss girder
Section air resistance coefficient is big, and bluff body section aeroperformance is poor, and the driving wind speed threshold value of train is relatively low.
Across the large span road-cum-rail bridge in bay, straits, main beam design faces following four technological challenge：
(1) wind resistance safety.To reduce windage, girder shape should make the quiet wind resistance suffered by it small, and with good
Aerodynamic stbilization performance.
(2) train is round-the-clock current.To lift the operation efficiency of train, it should ensure that train can be safe under windy conditions
Operation.
(3) train traffic safety with it is comfortable.Lifting train operational safety and comfortableness, bridge need to possess enough axles
To, vertical, transverse direction and torsional rigidity.
(4) highway bridge is antifatigue.Traditional Orthotropic Steel Bridge Deck fatigue problem protrudes, poor durability.
In summary, large span road-cum-rail bridge is at sea built, it is round-the-clock logical to solve wind resistance safety, train
Row, column car traffic safety is with the comfortable, technical barrier such as highway bridge panel is antifatigue, it is necessary to carry out innovative design.
The content of the invention
(1) technical problems to be solved
The present invention is to solve the deficiencies in the prior art, there is provided a kind of split type plate girder of four main trusses for installing tuyere and case purlin
Girder is combined, is resisted with solving the round-the-clock current, train traffic safety of the wind resistance safety of bridge, train with comfortable, highway bridge panel
The technical barriers such as fatigue.
(2) technical scheme
To reach above-mentioned purpose, the invention provides a kind of split type plate girder of four main trusses for installing tuyere and case purlin combination master
Beam, the main beam structure include：
Two double main truss structures, by setting lateral connection system therebetween to connect as one, as overall force structure,
Arranged in horizontal symmetrical；
Two tuyeres, it is connected respectively with the outside of two double main truss structures, each tuyere includes upper skew web plate and lower skew web plate,
Upper skew web plate connected with lower skew web plate in "<" shape；
Lateral connection system, the left and right sides is connected with two double main truss structures, including entablature, sill and cell structure.
In such scheme, double main truss structures include：
Side main truss, it is arranged at the outside of double main truss structures, outside connection tuyere；
Middle main truss, two double relative inner sides of main truss structure are arranged at, system is connected with lateral connection；
Highway bridge system, using sheet stringer structure, it is arranged between side main truss and middle main truss, and is located at top；
Railway deck system, using case purlin structure, it is arranged between side main truss and middle main truss, and is located at bottom；
Horizontal-associate, it is arranged at the bottom of highway bridge system.
In such scheme, in double main truss structures,
Side main truss is the Warren truss structure with montant, including winded up in purlin, while purlin lower edge, while purlin brace, while purlin erect
Bar and side jeer beam anchorage structure；Wherein, when jeer beam anchorage structure is arranged on purlin wind up, while purlin brace and while purlin montant connect
Connect the top at place；
Middle main truss is the Warren truss structure with montant, including middle purlin is winded up, middle purlin lower edge, middle purlin brace, middle purlin are erected
Bar and middle jeer beam anchorage structure；Wherein, the plane where middle main truss is parallel to the plane where the main truss of side, and middle main truss
Middle purlin is winded up, middle purlin lower edge, middle purlin brace, middle purlin montant are respectively parallel to wind up in the while purlin of main truss, while purlin lower edge, while purlin it is oblique
Bar, side purlin montant；Middle jeer beam anchorage structure be arranged on middle purlin wind up, the top of middle purlin brace and middle purlin montant junction.
Highway bridge system, it is connected to side purlin and winds up and winded up with middle purlin；Including top plate, longeron, crossbeam, wherein top plate is use
The steel that high-strength and high-ductility concrete slab combines with steel bridge deck-high performance concrete combining structure bridge floor；High-strength and high-ductility coagulation
Native plate is cast in the top of steel bridge deck, is effectively connected by Shear connection key therebetween, wherein, high-strength and high-ductility mixes
Concrete board 40~50mm of thickness, 14~20mm of Steel Bridge Deck thickness of slab；
Railway deck system, it is connected to side purlin lower edge and middle purlin lower edge；Using steel construction or steel-mixed combining structure；
Horizontal-associate is to use multiple " △ " truss structures connected horizontally, and its top is connected with highway bridge system, both sides point
It is not connected with side purlin montant, middle purlin montant.
In such scheme, the lateral connection system includes：
Entablature, be arranged on middle purlin wind up contour horizontal plane and wind up with middle purlin it is vertical, winded up in middle purlin and in
The intersection of purlin montant winds up with middle purlin and is connected；
Sill, be arranged on horizontal plane that middle purlin lower edge is contour and vertical with middle purlin lower edge, middle purlin lower edge and in
The intersection of purlin montant is connected with middle purlin lower edge；
Cell structure, winded up the rectangle region connected and composed in horizontally disposed, adjacent installed in two entablature and middle purlin
In.
In such scheme, in the tuyere：
Upper skew web plate connection is winded up in the while purlin of main truss, and the angle α with horizontal plane is 20 °~40 °；
For the connection of lower skew web plate in the while purlin lower edge of main truss, the angle β with horizontal plane is 15 °~35 °.
In such scheme, net level length is from the height for B1, each double main truss structures on the inside of described two double main truss structures
For H, the horizontal width of each tuyere is B3, and fixed condition includes really by described parameter B1, B3, H, α, β and ψ：
A, the critical wind speed of flutter of bridge is more than flutter inspection wind speed；
B, bridge whirlpool shakes vertically and torsional amplitudes are less than specification feasible value；
C, train operational safety and comfort index meet code requirement on bridge；
D, under conditions of meeting a, b and c, the construction costs of girder is minimum.
(3) beneficial effect
It can be seen from the above technical proposal that the split type plate girder of four main trusses and case purlin combination girder of present invention installation tuyere
At least have the advantages that one of them：
(1) the streamlined split type girder section formed by tuyere, double main truss structures, lateral connection system, windage is small, gas
Dynamic performance is good；
(2) it is arranged on due to railroad track in the space that the three side sealing that the double main truss structures of tuyere and two surround closes, train
Very little affected by wind in running, therefore can ensure in daily and general windy conditions Train round-the-clock running；
(3) cell structure is set by lateral connection system between two double main truss structures, therefore can be by the whirlpool in air-flow
Break up, effectively suppress vortex-induced vibration；And the surface of cell structure is using sound absorption Energy dissipating material, so as to reduce lower floor's rail
Interference of the road traffic noise to on-highway motor vehicle traffic, is advantageous to highway traffic safety；
(4) due to four main trusses, steel-mixed combination plate girder formula highway bridge system and case purlin formula railway deck system, lateral connection
The main bearing member connection and reasonable arrangements such as system, the overall axial rigidity of main beam structure, vertical rigidity, lateral stiffness and torsional rigidity are equal
It is very big, and damping is also higher, thereby may be ensured that the security and comfortableness of train operation；
(5) because highway bridge system is using high-strength and high-ductility concrete and the combined bridge deck of steel bridge deck, the entirety of bridge floor
Rigidity is big, damping is high, therefore the anti-fatigue performance being remarkably improved under on-highway motor vehicle load action, while can also improve bridge floor paving
The durability of dress.
Brief description of the drawings
Fig. 1 is that the stereochemical structure of the split type plate girder of four main trusses and case purlin combination girder that the embodiment of the present invention installs tuyere is shown
It is intended to.
Fig. 2 is the section signal that the embodiment of the present invention installs the split type plate girder of four main trusses of tuyere and girder is combined in case purlin
Figure；
Fig. 3 is double main truss structures that the embodiment of the present invention installs the split type plate girder of four main trusses of tuyere and girder is combined in case purlin
Dimensional structure diagram；
Fig. 4 is that the embodiment of the present invention installs the split type plate girder of four main trusses of tuyere and the side main truss of girder is combined with case purlin
Main truss dimensional structure diagram.
Fig. 5 is the highway bridge system that the embodiment of the present invention installs the split type plate girder of four main trusses of tuyere and girder is combined in case purlin
Top board structure schematic diagram.
Fig. 6 is the lateral connection system that the embodiment of the present invention installs the split type plate girder of four main trusses of tuyere and girder is combined in case purlin
Dimensional structure diagram.
【Main element of embodiment of the present invention symbol description in accompanying drawing】
1st, double main truss structures；2nd, tuyere
3rd, lateral connection system；4th, side main truss
5th, middle main truss；6th, highway bridge system
7th, railway deck system；8th, horizontal-associate
9th, side purlin is winded up；10th, side purlin lower edge
11st, side purlin brace；12nd, side purlin montant
13rd, side jeer beam anchorage structure；14th, middle purlin is winded up
15th, middle purlin lower edge；16th, middle purlin brace
17th, middle purlin montant；18th, middle jeer beam anchorage structure
19th, top plate；20th, high-strength and high-ductility coagulation body plate
21st, steel bridge deck；22nd, Shear connection key
23rd, upper skew web plate；24th, lower skew web plate
25th, entablature；26th, sill
27th, cell structure；28th, longeron
29th, crossbeam
The double main couple structure level clear distances of B1- two；The width of the double main truss structures of B2-
B3- tuyere width；The height of the double main truss structures of H-
The angle of α-upper skew web plate and horizontal plane；The angle of β-lower skew web plate and horizontal plane.
Embodiment
The invention provides a kind of split type plate girder of four main trusses for installing tuyere and case purlin combination girder, the girder includes two
Individual double main truss structures, a lateral connection system and two tuyeres.Two double main truss structures are arranged in horizontal symmetrical, by being arranged at
Lateral connection system therebetween connects as one, as overall force structure.Each double main truss structures are by side main truss, middle main truss, public affairs
Road bridge deck, railway deck system and horizontal-associate are formed.A tuyere is respectively provided with the outside of each double main truss structures, tuyere is by upper oblique abdomen
Plate and lower skew web plate are formed, upper skew web plate connect with lower skew web plate and is in "<" shape, the upper edge of upper skew web plate be connected to while main truss while
Purlin is winded up, and the lower edge of lower skew web plate is connected to the while purlin lower edge in main truss.Upper skew web plate, lower skew web plate and horizontal plane angle α,
β values between 20 °~40 °, 15 °~35 ° respectively.
Highway bridge system is located on railway deck system in double main truss structures, and highway bridge system is sheet stringer structure, and it is pushed up
Plate uses case purlin structure using high-strength and high-ductility concrete slab and the combined bridge deck of steel bridge deck, railway deck system.By tuyere,
The streamlined split type girder section that double main truss structures, lateral connection system are formed, windage is small, aeroperformance is good, and structure is firm
Degree is big, damping is high, and train operational safety and comfortableness are good, and highway bridge anti-fatigue performance is good, meet typhoon region large span
The demand of road-cum-rail bridge.
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
Certain embodiments of the invention will be done with reference to appended accompanying drawing in rear and more comprehensively describe to property, some of but not complete
The embodiment in portion will be illustrated.In fact, various embodiments of the present invention can be realized in many different forms, and should not be construed
To be limited to this several illustrated embodiment；Relatively, there is provided these embodiments cause the present invention to meet applicable legal requirement.
The present invention first exemplary embodiment in, there is provided it is a kind of install tuyere the split type plate girder of four main trusses and
Combine girder in case purlin.Fig. 1 is that first embodiment of the invention installs the split type plate girder of four main trusses of tuyere and girder is combined in case purlin
Dimensional structure diagram.Fig. 2 is that the embodiment of the present invention installs the split type plate girder of four main trusses of tuyere and the disconnected of girder is combined in case purlin
Face schematic diagram.As shown in Figure 1-2, the split type plate girder of four main trusses of present invention installation tuyere and case purlin combination girder include：Two
Double main truss structures 1, lateral connection system 3 and two tuyeres 2.
The split type plate girder of four main trusses of tuyere is installed to the present embodiment individually below and each composition of girder is combined in case purlin
Part is described in detail.
Referring to Fig. 2, two double main truss structures 1 arrange that outside is respectively provided with tuyere 2 in horizontal symmetrical.Two double main truss structures 1
By setting lateral connection system 3 therebetween to connect as one, as overall force structure, inner side net level length is from for B1, often
The width of individual double main truss structures 1 is B2, is highly H.
Referring to Fig. 3 and Fig. 4, each double main truss structures 1 include side main truss 4, middle main truss 5, highway bridge system 6, railway deck
It is 7, horizontal-associate 8.Fig. 1 to Fig. 5 is refer to, the side main truss 4 is arranged at the outside of double main truss structures 1, outside connection tuyere 2；In
Main truss 5 is arranged at two pairs of relative inner sides of main truss structure 1, is connected with lateral connection system (3)；Highway bridge system 6 and railway deck
It is 7 to be arranged between side main truss 4 and middle main truss 5, and highway bridge system 6 is located on railway deck system 7, and in highway bridge system
6 lower sections are provided with horizontal-associate 8.Wherein：
Side main truss 4 is the Warren truss structure with montant, including wind up in purlin 9, while purlin lower edge 10, side purlin brace 11,
In purlin montant 12 and while jeer beam anchorage structure 13；Wherein, when jeer beam anchorage structure 13 is arranged on, purlin 9, side purlin of winding up is oblique
Bar 11 and the top of the junction of side purlin montant 12；
Middle main truss 5 is the Warren truss structure with montant, including middle purlin is winded up 14, middle purlin lower edge 15, middle purlin brace
16th, middle purlin montant 17 and middle jeer beam anchorage structure 18；Wherein, the plane where middle main truss 5 is parallel to the place of side main truss 4
Plane, and wind up 14, middle purlin lower edge 15, middle purlin brace 16, middle purlin montant 17 of the middle purlin of middle main truss 5 is respectively parallel to side main truss
4 wind up 9 in purlin, while purlin lower edge 10, while purlin brace 11, while purlin montant 12；Middle jeer beam anchorage structure 18 is arranged on middle purlin
String 14, middle purlin brace 16 and the top of the middle junction of purlin montant 17.
Highway bridge system 6, be connected to side purlin wind up 9 and middle purlin wind up 14；Including top plate 19, longeron 28, crossbeam 29, its
Middle top plate 19 is the steel-high performance concrete combining structure combined using high-strength and high-ductility concrete slab 20 with steel bridge deck 21
Bridge floor；High-strength and high-ductility concrete slab 20 is cast in the top of steel bridge deck 21, is carried out by Shear connection key 22 therebetween
Effectively connection, wherein, the 40~50mm of thickness of high-strength and high-ductility concrete slab 20, the 14~20mm of thickness of steel bridge deck 21；
Railway deck system 7, it is connected to side purlin lower edge 10 and middle purlin lower edge 15；Using steel construction or steel-mixed combining structure；
Horizontal-associate 8 is to use multiple " △ " truss structures connected horizontally, and its top is connected with highway bridge system 6, both sides
It is connected respectively with side purlin montant 12, middle purlin montant 17.
Fig. 2 and Fig. 3 are refer to, two tuyeres 2 are connected with two double outsides of main truss structure 1 respectively, by upper skew web plate with
Skew web plate form, upper skew web plate connect with lower skew web plate be in "<" shape, tuyere horizontal width is B3, and skew web plate 23 connects side thereon
Purlin winds up 9, and lower skew web plate 24 connects side purlin lower edge 10, and the angle α of upper skew web plate 23 and horizontal plane takes between 20 °~40 °
Value, the angle β of the lower skew web plate 24 and horizontal plane value between 15 °~35 °.
Referring to Fig. 1, Fig. 3 and Fig. 6, the lateral connection system 3 includes entablature 25, sill 26 and cell structure 27, its
In, entablature 25 is arranged on to wind up with middle purlin and 14 contour horizontal planes and winded up 14 vertical, 14 Hes of being winded up in middle purlin with middle purlin
The intersection of middle purlin montant 17 and middle purlin, which are winded up, 14 to be connected；Sill 26 is arranged on the horizontal plane contour with middle purlin lower edge 15 simultaneously
And it is vertical with middle purlin lower edge 15, it is connected in the intersection of middle purlin lower edge 15 and middle purlin montant 17 with middle purlin lower edge 15；Cell structure
27 wind up in the 14 rectangle sections connected and composed in horizontally disposed, adjacent installed in two entablature 25 with middle purlin.Sill
26 surround in rectangle section with middle purlin lower edge 15, can also set cell structure 27.The ventilative rate ψ of cell structure 27 40%~
Value in the range of 80%；The surface of cell structure 27 reduces noise caused by train operation to public affairs using sound absorption Energy dissipating material
Road and bridge, face got on the car the interference of human pilot.
Referring to Fig. 1 to Fig. 5, the parameter such as described B1, B3, α, β and ψ is fixed really, is：
A, the critical wind speed of flutter of bridge is more than flutter inspection wind speed；
B, bridge whirlpool shakes vertically and torsional amplitudes are less than specification feasible value；
C, train operational safety and comfort index meet code requirement on bridge；
D, under conditions of meeting a, b and c, the construction costs of girder is minimum.
The split type plate girder of four main trusses and case purlin combination girder rigidity of present invention installation tuyere are big, and wind resistance is good, train
Safety in operation and comfortableness are good, and highway bridge anti-fatigue performance is good, it is ensured that train is round-the-clock current, suitable for being taken place frequently with typhoon
The large span road-cum-rail bridge in area.
So far, the split type plate girder of four main trusses of first embodiment of the invention installation tuyere and case purlin combination girder have been introduced
Finish.
So far, the embodiment of the present invention is described in detail combined accompanying drawing.It should be noted that in accompanying drawing or say
In bright book text, the implementation that does not illustrate or describe is form known to a person of ordinary skill in the art in art, and
It is not described in detail.In addition, the above-mentioned definition to each element and method be not limited in mentioning in embodiment it is various specific
Structure, shape or mode, those of ordinary skill in the art simply can be changed or replaced to it.
It should also be noted that, the direction term mentioned in embodiment, for example, " on ", " under ", "front", "rear", " left side ",
" right side " etc., only it is the direction of refer to the attached drawing, is not used for limiting the scope of the invention.Through accompanying drawing, identical element by
Same or like reference represents.When the understanding of the present invention may be caused to cause to obscure, conventional structure will be omitted
Or construction.
And the shape and size of each part do not reflect actual size and ratio in figure, and only illustrate the embodiment of the present invention
Content.In addition, in the claims, any reference symbol between bracket should not be configured to the limit to claim
System.
Unless there are known entitled phase otherwise meaning, the numerical parameter in this specification and appended claims are approximations, energy
Enough required characteristic changings according to as obtained by present disclosure.Specifically, it is all to be used in specification and claim
The numeral of the middle content for representing composition, reaction condition etc., it is thus understood that repaiied by the term of " about " in all situations
Decorations.Generally, the implication of its expression refers to include by specific quantity ± 10% change in certain embodiments, at some
± 5% change in embodiment, ± 1% change in certain embodiments, in certain embodiments ± 0.5% change.
Furthermore word "comprising" does not exclude the presence of element or step not listed in the claims.Before element
Word "a" or "an" does not exclude the presence of multiple such elements.
Specification and the word of ordinal number such as " first ", " second ", " the 3rd " etc. used in claim, with modification
Corresponding element, itself is not meant to that the element has any ordinal number, does not also represent the suitable of a certain element and another element
Order in sequence or manufacture method, the use of those ordinal numbers are only used for enabling the element with certain name and another tool
The element for having identical name can make clear differentiation.
Similarly, it will be appreciated that in order to simplify the present invention and help to understand one or more of each open aspect,
Above in the description to the exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：I.e. required guarantor
The application claims of shield features more more than the feature being expressly recited in each claim.It is more precisely, such as following
Claims reflect as, open aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following embodiment are expressly incorporated in the embodiment, wherein each claim is in itself
Separate embodiments all as the present invention.
Particular embodiments described above, the purpose of the present invention, technical scheme and beneficial effect are carried out further in detail
Describe in detail it is bright, should be understood that the foregoing is only the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., it should be included in the guarantor of the present invention
Within the scope of shield.
Claims (7)
1. a kind of split type plate girder of four main trusses for installing tuyere and case purlin combination girder, including：
Two double main truss structures (1), by setting lateral connection system (3) therebetween to connect as one, as overall stress knot
Structure, arranged in horizontal symmetrical；
Two tuyeres (2), be connected respectively with the outside of two double main truss structures (1), each tuyere (2) including upper skew web plate (23) and
Lower skew web plate (24), upper skew web plate (23) and lower skew web plate (24) connection in "<" shape；
Lateral connection system (3), the left and right sides are connected with two double main truss structures (1), including entablature (25), sill (26) and
Cell structure (27).
2. the split type plate girder of four main truss according to claim 1 and case purlin combination girder, double main truss structures (1) bags
Include：
Side main truss (4), it is arranged at the outside of double main truss structures (1), outside connection tuyere (2)；
Middle main truss (5), two double relative inner sides of main truss structure (1) are arranged at, are connected with lateral connection system (3)；
Highway bridge system (6), using sheet stringer structure, it is arranged between side main truss (4) and middle main truss (5), and is located at top；
Railway deck system (7), using case purlin structure, it is arranged between side main truss (4) and middle main truss (5), and is located at bottom；
Horizontal-associate (8), it is arranged at the bottom of highway bridge system (6).
3. the split type plate girder of four main truss according to claim 2 and case purlin combination girder, in double main truss structures (1),
Side main truss (4) is the Warren truss structure with montant, including winded up (9) in purlin, while purlin lower edge (10), side purlin brace
(11), while purlin montant (12) and while jeer beam anchorage structure (13)；Wherein, when jeer beam anchorage structure (13) is arranged on purlin
String (9), while purlin brace (11) with while purlin montant (12) junction top；
Middle main truss (5) is the Warren truss structure with montant, including middle purlin is winded up (14), middle purlin lower edge (15), middle purlin brace
(16), middle purlin montant (17) and middle jeer beam anchorage structure (18)；Wherein, the plane where middle main truss (5) is parallel to side main truss
(4) plane where, and the middle purlin of middle main truss (5) is winded up (14), middle purlin lower edge (15), middle purlin brace (16), middle purlin montant
(17) be respectively parallel to wind up (9) in the while purlin of main truss (4), while purlin lower edge (10), while purlin brace (11), side purlin montant (12)；
Middle jeer beam anchorage structure (18) be arranged on middle purlin wind up (14), the top of middle purlin brace (16) and middle purlin montant (17) junction
Portion.
Highway bridge system (6), is connected to that side purlin is winded up (9) and middle purlin is winded up (14)；Including top plate (19), longeron (28), crossbeam
(29), wherein top plate (19) is to be mixed using high-strength and high-ductility concrete slab (20) with steel-high-performance that steel bridge deck (21) combines
Coagulate native combination bridge face；High-strength and high-ductility concrete slab (20) is cast in the top of steel bridge deck (21), passes through therebetween
Shear connection key (22) is effectively connected, wherein, high-strength and high-ductility concrete slab (20) 40~50mm of thickness, steel bridge deck (21)
14~20mm of thickness；
Railway deck system (7), it is connected to side purlin lower edge (10) and middle purlin lower edge (15)；Using steel construction or steel-mixed combining structure；
Horizontal-associate (8) is to use multiple " △ " truss structures connected horizontally, and its top is connected with highway bridge system (6), both sides
It is connected respectively with side purlin montant (12), middle purlin montant (17).
4. the split type plate girder of four main truss according to claim 1 and case purlin combination girder, lateral connection system (3) bag
Include：
Entablature (25), be arranged on winded up with middle purlin (14) contour horizontal plane and winded up with middle purlin (14) it is vertical, in middle purlin
Wind up (14) and the intersection of middle purlin montant (17) winded up with middle purlin (14) be connected；
Sill (26), be arranged on horizontal plane that middle purlin lower edge (15) is contour and vertical with middle purlin lower edge (15), in middle purlin
The intersection of lower edge (15) and middle purlin montant (17) is connected with middle purlin lower edge (15)；
Cell structure (27), in horizontally disposed, adjacent installed in two entablature (25) and middle purlin wind up (14) connect and compose
Rectangle section in.
5. the split type plate girder of four main truss according to claim 4 and case purlin combination girder, the cell structure (27) it is saturating
Wind rate ψ is 40%~80%, and the surface of cell structure (27) is using sound absorption Energy dissipating material.
6. the split type plate girder of four main truss according to claim 1 and case purlin combination girder, in the tuyere (2)：
Upper skew web plate (23) connection is winded up (9) in the while purlin of main truss (4), and the angle α with horizontal plane is 20 °~40 °；
The connection of lower skew web plate (24) while main truss (4) while purlin lower edge (10), the angle β with horizontal plane is 15 °~35 °.
7. the split type plate girder of four main truss according to claim 1 and case purlin combination girder, described two double main truss structures (1)
Inner side net level length is from for B1, and the height of each double main truss structures (1) is H, and the horizontal width of each tuyere (2) is B3, described
Fixed condition includes really by parameter B1, B3, H, α, β and ψ：
A, the critical wind speed of flutter of bridge is more than flutter inspection wind speed；
B, bridge whirlpool shakes vertically and torsional amplitudes are less than specification feasible value；
C, train operational safety and comfort index meet code requirement on bridge；
D, under conditions of meeting a, b and c, the construction costs of girder is minimum.
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| CN114214934A (en) * | 2022-01-06 | 2022-03-22 | 中铁大桥勘测设计院集团有限公司 | Girder structure of double-deck bridge floor |
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