CN101413247A - Streamline steel-concrete folding case beam - Google Patents
Streamline steel-concrete folding case beam Download PDFInfo
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- CN101413247A CN101413247A CNA2008102388675A CN200810238867A CN101413247A CN 101413247 A CN101413247 A CN 101413247A CN A2008102388675 A CNA2008102388675 A CN A2008102388675A CN 200810238867 A CN200810238867 A CN 200810238867A CN 101413247 A CN101413247 A CN 101413247A
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Abstract
The invention discloses a streamlined steel-concrete superimposed box girder, which relates to the technical field of bridge engineering and is used for a long-span bridge girder. Two sides of the superimposed box girder are provided with tuyere structures, and a bridge panel adopts a superimposed structure consisting of prefabricated concrete slabs and a post-poured concrete layer. When the box girder is in use, the superimposed box girder is a streamlined single-box single-chamber or single-box multi-chamber cross section; the tuyere structures are polygonal open thin-walled structures; and longitudinal-transverse prestress is applied in the superimposed bridge panel. The box girder effectively improves the torsional rigidity and wind-resistant stability of the section of the girder, remarkably improves the integrity and durability of the bridge panel, and expands the application of superimposed girders in cable-stayed bridges and other long-span bridges.
Description
Technical field
The present invention relates to technical field of bridge engineering, specifically a kind of streamline steel-concrete folding case beam structure that is used for the long span bridge beam.
Background technology
Steel-concrete folding the beam that is used for bridge main beam is to combine cooperative structure by girder steel work and concrete slab by shear connector.Compare steel box girder bridge, composite girder bridge replaces Orthotropic Steel Bridge Deck with concrete slab, saves steel, and deck paving is easy to be reliable; Compare concrete box-beam bridge, composite girder bridge is except that bridge deck, and remainder adopts steel work, greatly reduces superstructure weight, has saved the substructure cost.
For long span bridge beams such as superposed beam cable stayed bridges, superimposed girder cross-sectional form commonly used at present comprises the superimposed main beam structure that adopts duplexing font girder steel, the superimposed main beam structure of employing separate type steel case beam, the superimposed main beam structure of employing monolithic steel case beam etc.These girder cross sections or be open section, torsional rigidity is poor; Or the profile passivation, wind resistance is not satisfactory.If wind resistance is had relatively high expectations, then need take the necessary measures.
In addition, stride greatly in the composite girder bridge existing, bridge deck adopt precast concrete plank usually, and the joint concrete by cast-in-place girder steel lattice end face makes precast concrete plank and girder steel form whole co-operation.Though this method is by increasing the adverse effect that precast concrete plank has reduced concrete shrinkage and creep the length of time, but the bridge floor globality is relatively poor, be prone to endurance issues such as concrete cracking near wet seam, this respect disease has appearred in Canadian Annacis bridge etc.
The problems referred to above have limited the further application of superposed beam in long span bridge beams such as cable stayed bridge.
For improving the wind resistance of long span bridge beams such as superposed beam cable stayed bridge, the main mode that adopts has at present: 1) for the superimposed girder that adopts duplexing font girder steel, at girder arranged outside deflector, as Qingzhou Min River Bridge, this bridge is the double tower double plane cable stayed bridge of main span 605m, the wide 29m of bridge floor, design basic wind speed 36m/s; 2) for the superimposed girder that adopts separate type steel case beam, in the girder both sides tuyere structure is set, tuyere is made of thin wall construction; the cross section of thin wall construction triangular in shape (State Intellectual Property Office of the People's Republic of China's patent of invention has been applied in this invention; application number: 200610025774.5), as a Pearl Mountain bridge, this bridge is the double tower double plane cable stayed bridge of main span 332m; the wide 35m of bridge floor, design basic wind speed 42m/s; 3) for the superimposed girder that adopts monolithic steel case beam, oblique web lower edge at girder is provided with the maintenance track structure, this maintenance track structure is made up of track and rail supported piece that (State Intellectual Property Office of the People's Republic of China's patent of invention has been applied in this invention, application number: 200610025063.8), as Donghai Bridge, this bridge is the double tower rachis face cable stayed bridge of main span 420m, the wide 33m of bridge floor, design basic wind speed 42m/s.These measures can improve the wind resisting stability of the type bridge, but do not solve the wind resistance problem of striding the composite girder bridge that the footpath is big, bridge floor is wide fully, and the girder cross section still has the space of improving torsional rigidity, improving aerodynamic configuration, and still needing further develops.
2004, Nie of Tsing-Hua University founds the state and has invented a kind of steel-concrete folding plate combined beam (State Intellectual Property Office of the People's Republic of China's patent of invention that is used for highway bridge and industry and civilian construction floor system, the patent No.: 200410062214.8): on girder steel, weld shear connector, solid steel reinforced concrete or hollow steel bar concrete prefabricated board are laterally taken on the top flange of i-shape steel beam or box steel beam, its plate end stretches out the beard muscle and intersects mutually, be welded to each other, the pouring concrete last layer forms then.Compare the cast in place concrete plate compound beam, folding plate combined beam has been saved template, has reduced on-site concrete wet trade amount, shortens the construction period; Compare the precast concrete plank compound beam, the folding plate combined beam globality has clear improvement.The type compound beam has obtained using more widely in building structure and medium and small striding in the Urban Bridge of footpath, application report is not arranged in long span bridge beams such as cable stayed bridge as yet, but it provides a kind of effective measures for improving long span bridge beam bridge floor globality.At present the folding plate combined beam technology being applied to long span bridge beam such as cable stayed bridge remains in following technological difficulties: stride cable stayed bridge greatly and stride that the footpath is big, bridge floor is wide, near main span span centre and end bay transition pier non-stayed cable segment girder bears bigger longitudinal pulling force, and bridge deck also are subjected to very big horizontal tensile stress effect at girder longeron place, therefore only depend on superimposed bridge deck structure can not solve the problem of bridge deck concrete cracking fully, also need further research to meet that long span bridge girder construction such as cable stayed bridge is stressed, the novel measure of construction features.
Summary of the invention
The object of the present invention is to provide a kind of streamline steel-concrete folding case beam, torsional rigidity is big, and wind resistance is good, effectively solves bridge deck concrete problem easy to crack, improves the durability of whole bridge deck structure.
For achieving the above object, technical solution of the present invention is:
A kind of streamline steel-concrete folding case beam, its described folding case beam is made of steel main beam structure, superimposed bridge deck and tuyere structure (16); Tuyere structure (16) places the folding case beam both sides, and whole folding case beam cross section is streamlined single case.
Described streamline steel-concrete folding case beam, its described steel main beam structure is made of outside steel longeron (1), inboard steel longeron (21), steel stringer (2), gooseneck (3), steel sole plate (4) and steel inclined bottom plate (5); Outside steel longeron (1), inboard steel longeron (21), steel stringer (2) and gooseneck (3) quadrature arrangement are formed the girder steel lattice; Inboard steel longeron (21), gooseneck (3) are divided into some chambers with folding case beam.
Described streamline steel-concrete folding case beam, its described outside steel longeron (1), inboard steel longeron (21), gooseneck (3) are the T-shape cross section, steel stringer (2) is " worker " type cross section, in the top flange of outside steel longeron (1), inboard steel longeron (21), steel stringer (2), gooseneck (3) shear connector (6) is set;
Steel sole plate (4) and steel inclined bottom plate (5), be the steel plate of band longitudinal stiffener (7), longitudinal stiffener (7) cross section be " U " type, T-shape or " L " type one of them.
Described streamline steel-concrete folding case beam, its described superimposed bridge deck are made of precast concrete plank (8) and back pouring concrete layer (9); Apply vertical, horizontal prestressing force in the superimposed bridge deck.
Described streamline steel-concrete folding case beam, its described precast concrete plank (8), be armored concrete slab, its thickness is 160～200mm, be provided with longitudinal prestressing steel beam tube road (10) and transverse prestress steel beam tube road (11) in the plate, plate top surface is provided with the shearing resistance distributing bar (20) of protrusion; The planar dimension and the girder steel lattice of precast concrete plank (8) are suitable, and its periphery places the top flange of girder steel lattice, and bearing length is not less than 5cm; Steel bar stress in the precast concrete plank (8) is stretched out by all sides and forms beard muscle (12), and the beard muscle (12) of contiguous two precast concrete planks (8) has at least 1/3 length to be welded to each other.
Described streamline steel-concrete folding case beam, its described back pouring concrete layer (9), its thickness is 60～120mm, covers on precast concrete plank (8) end face, and pours into a mould " U " type notch of contiguous prefabricated concrete slab (8) and the formation of girder steel lattice top flange; Back pouring concrete layer (9) inside is provided with distributing bar net (13), and its diameter is 8～12mm.
Described streamline steel-concrete folding case beam, apply vertical, horizontal prestressing force in its described superimposed bridge deck, pass interior longitudinal prestressing steel beam tube road (10) of some contiguous prefabricated concrete slabs (8) and transverse prestress steel beam tube road (11) and stretch-draw respectively by longitudinal prestressing steel bundle (14) and transverse prestress steel bundle (15) and realize; The some contiguous prefabricated concrete slab (8) that prestressed strand (14), (15) are passed, its end face and adjacent notch should be poured into a mould back pouring concrete layer (9), and are interconnected into integral body mutually; When back pouring concrete layer (9) reaches at least 70% intensity, can stretch-draw prestressing force steel bundle.
Described streamline steel-concrete folding case beam, its described shear connector (6), for peg, perforate steel plate or channel-section steel one of them.
Described streamline steel-concrete folding case beam, its described shearing resistance distributing bar (20) is circular arc or triangle, diameter is 8～12mm, highly is 40～100mm.
Described streamline steel-concrete folding case beam, its described tuyere structure (16), steel plate (18) and steel diaphragm (19) formation by band longitudinal stiffener (17) are polygonal-shaped openings thin-walled cross section; Steel longeron (1) by welding or the bolt and the outside is connected.
The present invention with respect to the major advantage of prior art is:
Employing is provided with the streamlined folding case beam section of tuyere structure, and its torsional rigidity is big, and wind resistance is good, has increased to stride composite girder bridge greatly in the scope of application of crossing over high wind speed areas such as straits, high mountain gorge; The superimposed bridge deck that adopt precast concrete plank and cast-in-situ concrete layer to form, apply vertical, horizontal prestressing force in the superimposed bridge deck, increased the bridge floor globality, efficiently solve and use near the precast plate superposed beam is prone to concrete cracking wet seam deficiency always, improve the globality and the durability of whole bridge deck structure, expanded the application of superposed beam in long span bridge beams such as cable stayed bridge.
Description of drawings
Fig. 1 is streamline steel of the present invention-concrete folding case beam structural representation;
Fig. 2 is the A portion enlarged diagram among Fig. 1;
Fig. 3 is a folding case beam steel main beam structure schematic diagram;
Fig. 4 is the precast concrete plank schematic diagram;
Fig. 5 is the tuyere structural representation;
Fig. 6 is a single box single chamber folding case beam schematic diagram.
The specific embodiment
See also shown in Fig. 1～6, be a kind of streamline steel-concrete folding case beam of the present invention.Folding case beam is made of steel main beam structure, superimposed bridge deck and tuyere structure 16; Tuyere structure 16 places the folding case beam both sides, and whole folding case beam is streamlined single case cross section.The steel main beam structure is made of outside steel longeron 1, inboard steel longeron 21, steel stringer 2, gooseneck 3, steel sole plate 4 and steel inclined bottom plate 5; Outside steel longeron 1, inboard steel longeron 21, steel stringer 2 and gooseneck 3 quadrature arrangement are formed the girder steel lattice; Inboard steel longeron 21, gooseneck 3 are divided into some chambers with folding case beam.Outside steel longeron 1, inboard steel longeron 21, gooseneck 3 are the T-shape cross section, and steel stringer 2 is " worker " type cross section, in the top flange of outside steel longeron 1, inboard steel longeron 21, steel stringer 2, gooseneck 3 shear connector 6 is set.Steel sole plate 4 and steel inclined bottom plate 5 is the steel plate of band longitudinal stiffener 7, longitudinal stiffener 7 cross sections be " U " type, T-shape or " L " type one of them.Superimposed bridge deck are made of precast concrete plank 8 and back pouring concrete layer 9; Apply vertical, horizontal prestressing force in the superimposed bridge deck.Precast concrete plank 8 is an armored concrete slab, and its thickness is 160～200mm, should satisfy working load, prestressed strand requirement is set etc.Be provided with longitudinal prestressing steel beam tube road 10 and transverse prestress steel beam tube road 11 in the plate, plate top surface is provided with the shearing resistance distributing bar 20 of protrusion.The planar dimension of precast concrete plank 8 and girder steel lattice are suitable, and its periphery places the top flange of girder steel lattice, and bearing length is not less than 5cm.Steel bar stress in the precast concrete plank 8 is stretched out by all sides and forms beard muscle 12, and the beard muscle 12 of two contiguous precast concrete planks 8 has at least 1/3 length to be welded to each other, and plays the local hogging moment of opposing bridge deck and vertical shearing resistance.Back pouring concrete layer 9 covers on precast concrete plank 8 end faces, and pours into a mould " U " type notch of contiguous prefabricated concrete slab 8 and the formation of girder steel lattice top flange; Back pouring concrete layer 9 inside are provided with distributing bar net 13, and its diameter is 8～12mm.Back pouring concrete layer 9 thickness are 60～120mm, should satisfy the protective layer thickness requirement of shearing resistance distributing bar 20 and distributing bar net 13.Apply vertical, horizontal prestressing force in the superimposed bridge deck, pass longitudinal prestressing steel beam tube road 10 in the some contiguous prefabricated concrete slabs 8 and transverse prestress steel beam tube road 11 and stretch-draw respectively by longitudinal prestressing steel bundle 14 and transverse prestress steel bundle 15 and realize; The some contiguous prefabricated concrete slab 8 that prestressed strand passes, its end face and adjacent notch should be poured into a mould back pouring concrete layer 9, and are interconnected into integral body mutually; When back pouring concrete layer 9 reaches at least 70% intensity, can stretch-draw prestressing force steel bundle.Shear connector 6 be peg, perforate steel plate or channel-section steel one of them.Shearing resistance distributing bar 20 is circular arc or triangle, and diameter is 8～12mm, highly is 40～100mm.Shear connector 6 and shearing resistance distributing bar 20 have guaranteed the effective adhesive that has of girder steel work, precast concrete plank 8 and back pouring concrete layer 9.Tuyere structure 16 is made of the steel plate 18 and the steel diaphragm 19 of band longitudinal stiffener 17, is polygonal-shaped openings thin-walled cross section, and its shape and size need be determined by wind tunnel test or method for numerical simulation.Steel diaphragm 19 vertical bridges are consistent with gooseneck 3 to the position; Tuyere structure 16 is connected by welding or bolt and outside steel longeron 1.
Claims (10)
1, a kind of streamline steel-concrete folding case beam is characterized in that: described folding case beam is made of steel main beam structure, superimposed bridge deck and tuyere structure (16); Tuyere structure (16) places the folding case beam both sides, and whole folding case beam cross section is streamlined single case.
2, streamline steel-concrete folding case beam according to claim 1 is characterized in that: described steel main beam structure is made of outside steel longeron (1), inboard steel longeron (21), steel stringer (2), gooseneck (3), steel sole plate (4) and steel inclined bottom plate (5); Outside steel longeron (1), inboard steel longeron (21), steel stringer (2) and gooseneck (3) quadrature arrangement are formed the girder steel lattice; Inboard steel longeron (21), gooseneck (3) are divided into some chambers with folding case beam.
3, streamline steel-concrete folding case beam according to claim 2, it is characterized in that: described outside steel longeron (1), inboard steel longeron (21), gooseneck (3) are the T-shape cross section, steel stringer (2) is " worker " type cross section, in the top flange of outside steel longeron (1), inboard steel longeron (21), steel stringer (2), gooseneck (3) shear connector (6) is set;
Steel sole plate (4) and steel inclined bottom plate (5), be the steel plate of band longitudinal stiffener (7), longitudinal stiffener (7) cross section be " U " type, T-shape or " L " type one of them.
4, streamline steel-concrete folding case beam according to claim 1 is characterized in that: described superimposed bridge deck are made of precast concrete plank (8) and back pouring concrete layer (9); Apply vertical, horizontal prestressing force in the superimposed bridge deck.
5, streamline steel-concrete folding case beam according to claim 4, it is characterized in that: described precast concrete plank (8), be armored concrete slab, its thickness is 160～200mm, be provided with longitudinal prestressing steel beam tube road (10) and transverse prestress steel beam tube road (11) in the plate, plate top surface is provided with the shearing resistance distributing bar (20) of protrusion; The planar dimension and the girder steel lattice of precast concrete plank (8) are suitable, and its periphery places the top flange of girder steel lattice, and bearing length is not less than 5cm; Steel bar stress in the precast concrete plank (8) is stretched out by all sides and forms beard muscle (12), and the beard muscle (12) of contiguous two precast concrete planks (8) has at least 1/3 length to be welded to each other.
6, streamline steel-concrete folding case beam according to claim 4, it is characterized in that: described back pouring concrete layer (9), its thickness is 60～120mm, cover on precast concrete plank (8) end face, and pour into a mould " U " type notch of contiguous prefabricated concrete slab (8) and the formation of girder steel lattice top flange; Back pouring concrete layer (9) inside is provided with distributing bar net (13), and its bar diameter is 8～12mm.
7, streamline steel-concrete folding case beam according to claim 4, it is characterized in that: apply vertical, horizontal prestressing force in the described superimposed bridge deck, pass interior longitudinal prestressing steel beam tube road (10) of some contiguous prefabricated concrete slabs (8) and transverse prestress steel beam tube road (11) and stretch-draw respectively by longitudinal prestressing steel bundle (14) and transverse prestress steel bundle (15) and realize; The some contiguous prefabricated concrete slab (8) that prestressed strand (14), (15) are passed, its end face and adjacent notch should be poured into a mould back pouring concrete layer (9), and are interconnected into integral body mutually; When back pouring concrete layer (9) reaches at least 70% intensity, can stretch-draw prestressing force steel bundle.
8, streamline steel-concrete folding case beam according to claim 3 is characterized in that: described shear connector (6), for peg, perforate steel plate or channel-section steel one of them.
9, streamline steel-concrete folding case beam according to claim 5 is characterized in that: described shearing resistance distributing bar (20), be circular arc or triangle, and diameter is 8～12mm, highly is 40～100mm.
10, streamline steel-concrete folding case beam according to claim 1, it is characterized in that: described tuyere structure (16), steel plate (18) and steel diaphragm (19) by band longitudinal stiffener (17) constitute, and the cross section is a polygonal-shaped openings thin wall construction pattern; Be connected by welding or bolt and outside steel longeron (1).
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Application publication date: 20090422 Assignee: Long Highway Bridge Construction CCCC National Engineering Research Center Co., Ltd. Assignor: CCCC Highway Consultants Co., Ltd. Contract record no.: 2013990000124 Denomination of invention: Split streamline steel-concrete composite box girder Granted publication date: 20101013 License type: Exclusive License Record date: 20130327 |
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