CN111455814A - Pi-shaped truss web steel box-concrete combined beam bridge - Google Patents
Pi-shaped truss web steel box-concrete combined beam bridge Download PDFInfo
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- CN111455814A CN111455814A CN202010291075.5A CN202010291075A CN111455814A CN 111455814 A CN111455814 A CN 111455814A CN 202010291075 A CN202010291075 A CN 202010291075A CN 111455814 A CN111455814 A CN 111455814A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D12/00—Bridges characterised by a combination of structures not covered as a whole by a single one of groups E01D2/00 - E01D11/00
Abstract
The invention relates to a Pi-shaped truss web steel box-concrete composite beam bridge; the box-type structural truss group is formed by connecting a main truss web member with a main truss upper chord member and a pi-shaped main truss lower chord member through a gusset plate by a main truss web member, and connecting truss sheets to form a truss group; the truss groups are connected through steel crossbeams, and the steel crossbeam diagonal web members are connected with the pi-shaped crossbeam upper chord members and the pi-shaped crossbeam lower chord members through gusset plates; the upper chord of the pi-shaped cross beam and the lower chord of the pi-shaped cross beam are sequentially connected through an upper parallel connection and a lower parallel connection. The device improves the structural strength, rigidity and stability, is convenient to design and construct, and enables the structural stress to be more reasonable.
Description
Technical Field
The invention relates to the technical field of bridges, in particular to a Pi-shaped truss web steel box-concrete composite beam bridge.
Background
Although the traditional steel truss girder bridge is simple and convenient to design, manufacture and install, large in adaptive span range and very wide in application, the steel truss girder bridge is large in structural space, small in structural integral rigidity and high in girder height, and the girder height is generally 1/12-1/8 of the span; the steel truss girder has weak lateral rigidity, a large amount of transverse supports are required to be arranged, all the trusses are connected into a whole to form space rigidity so as to resist longitudinal and transverse forces, the cross section of the supports is determined according to the requirements of the structural slenderness ratio and the like, and the structural material is not economical; the upper chord and the lower chord have larger fatigue stress, which is often a fatigue problem to control the size of the chord; the bridge deck pavement layer and the steel truss girder share live load, and the pavement layer is easy to have defects of various degrees.
Meanwhile, most of the existing steel-concrete composite beam bridges are I-shaped composite beams, box-shaped composite beams and corrugated steel web composite beams, and the traditional composite beam has the disadvantages of single structural form, small bearing capacity, weak bending rigidity, low economy and poor spanning capability, and cannot meet the requirement of large-span bridges.
Traditional steel truss bridge chord member adopts box and I-shaped cross-section more, causes the steel truss girder dead weight too big, and economic indicator is higher, and welding work volume is big, and the welding seam is too much and concentrated, and the fatigue strength influence after welding residual stress to the accurate connection of structure and the finished bridge is big, is unfavorable for later stage maintenance and maintenance, and the gusset plate size is too big simultaneously, influences the space permeability of truss bridge.
Disclosure of Invention
In order to overcome the defects of a steel truss bridge and a combined steel truss bridge, the invention provides the Pi-shaped truss web steel box-concrete combined beam bridge which can ensure the integral working performance of a steel truss and a concrete bridge deck, improve the strength, the rigidity and the stability of the structure, is convenient to design and construct and has more reasonable structural stress.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a Pi-shaped truss web steel box-concrete composite girder bridge comprises a box-type structure truss sheet group, a steel beam, an upper flat connection 10, a lower flat connection 11, a shear nail group 14, a bridge deck 12 and a wet joint bridge deck 13, wherein the box-type structure truss sheet group is formed by connecting a main truss web rod 3 with a Pi-shaped main truss upper chord 1 and a Pi-shaped main truss lower chord 2 through a gusset plate 5, and connecting truss sheets to form the truss sheet group;
the truss groups are connected through steel crossbeams, and the steel crossbeam diagonal web members 8 are connected with the Pi-shaped crossbeam upper chord members 6 and the Pi-shaped crossbeam lower chord members 7 through gusset plates 9;
the upper chord 6 and the lower chord 7 of the Pi-shaped beam are sequentially connected through an upper parallel connection 10 and a lower parallel connection 11;
the bridge deck 12 and the wet joint bridge deck 13 are fixed on the main truss upper chord 1 and the beam upper chord 6 through shear nail groups 14.
The pi-shaped main truss upper chord 1 is divided into a separated main truss upper chord and a combined main truss upper chord, the separated main truss upper chord is composed of a separated upper chord steel top plate 15 and two separated upper chord vertical plates 16, and the combined main truss upper chord is composed of a combined upper chord steel top plate 19 and four combined upper chord vertical plates 20.
The distance between the two split top chord vertical plates 16 and the distance between every two of the four combined top chord vertical plates 20 are both equal to the cross-sectional height of the main truss web 3.
The main truss lower chord 2 of the pi-shaped structure is divided into a separated main truss lower chord and a combined main truss lower chord, the separated main truss lower chord is composed of a separated lower chord steel base plate 17 and two separated lower chord vertical plates 18, and the combined main truss lower chord is composed of a combined lower chord steel base plate 21 and four combined lower chord vertical plates 22.
The distance between the two separate lower chord vertical plates 18 and the distance between every two of the four combined lower chord vertical plates 22 are both equal to the height of the section of the main truss web 3.
The pi-shaped beam upper chord 6 is formed by welding a beam upper chord steel top plate 23 and two beam upper chord vertical plates 24, and the pi-shaped beam lower chord 7 is formed by welding a beam lower chord steel bottom plate 25 and two beam lower chord vertical plates 26.
The distance between the two beam upper chord vertical plates 24 and the distance between the two beam lower chord vertical plates 26 are equal to the height of the cross section of the beam web member 8 on the steel beam.
The invention has the beneficial effects that:
1. the invention has the characteristics of clear force transmission path of the truss sheet group with the box-type structure, flexible design and the like, the chord member can increase the width and the thickness of the horizontal steel plate according to the stress, and the web members of the main truss girder and the web members of the cross beam can be selected by various structural forms such as I-shaped steel, welded box-type structures and the like, thereby increasing the utilization rate of the cross section and meeting the requirements of different spans and different stress positions.
2. The section of the upper chord member and the section of the lower chord member of the Pi-shaped main truss girder belong to open sections, can be maintained, checked and maintained, and have the characteristics of long service life, durability and the like.
3. The box-type structure truss sheet group has smaller section size, can ensure the structure quality in the transportation process, can adopt construction methods such as pushing, hoisting and the like in the erection process, enriches the construction methods, and lays a temporary working platform by using the box-type structure truss sheet group in the installation process, thereby facilitating the subsequent construction and improving the economic benefit.
4. The truss type cross beam structure is adopted, the structural stress is clear, the torsion resistance of the truss is improved, meanwhile, the stress of the main truss piece group is uniform, the upper chord of the cross beam and the bridge deck are jointly pressed, the lower chord of the cross beam is pulled, the web members of the cross beam are divided into a tension diagonal web member and a compression diagonal web member to jointly resist the shearing force, and the out-of-plane free length of the chord member of the cross beam is greatly reduced through the arrangement of upper and lower parallel connection.
5. The shear nail group is arranged at the node of the cross beam to connect the steel truss beam and the bridge deck, the constant load of the bridge deck, the pavement guardrail and the like and the vehicle load are transmitted to the steel beam through the shear nail group, the transmission of the upper load is mainly axial force, the influence of factors such as additional bending moment on the internal force of the main truss beam and the cross beam is reduced, and materials are saved.
6. The invention can adopt the anti-pulling non-shearing shear nail group near the fulcrum in the multi-span continuous beam to connect the steel truss beam and the bridge deck, thereby providing the anti-lifting force, reducing the longitudinal shear flow of the steel concrete joint surface and effectively improving the service performance of the bridge deck.
7. The invention can pour UHPC high-strength concrete, micro-expansion concrete and other materials into the cavity of the box-type structure truss sheet group at the fulcrum position of the steel truss girder, thereby forming the stress of a combined structure, increasing the rigidity of the fulcrum section, enhancing the stability of the support section, and having the advantages of large torsional rigidity, strong shearing resistance, good overall performance and the like.
8. The truss sheet group, the cross beam, the parallel connection and the gusset plate of the box type structure are all steel structures, the steel performance is stable, and the safety of the structure is easy to ensure. The connection between the structures can adopt welding or bolting, and the processing and the construction are convenient.
9. The bridge deck slab comprises a profiled steel sheet combined bridge deck slab, a prefabricated UHPC waffle type bridge deck slab and a prefabricated common concrete bridge deck slab, the bridge deck slab is long in manufacturing age, small in later-stage shrinkage and creep, and good in quality, is manufactured in a factory, reduces the workload of later-stage template installation, simplifies the construction process, and the steel and concrete bridge deck slab are combined, so that the bearing capacity of the steel truss combined beam is improved due to the performance of the two materials, and the bridge deck slab has a wider application prospect compared with the traditional steel truss beam.
10. The separated type Pi-shaped truss web steel box-concrete combined beam bridge has the advantages of clear structural stress, steel saving, attractive and concise appearance and wide application in the design of medium and large span bridges.
11. The combined type pi-shaped truss web steel box-concrete combined beam bridge has definite structural stress, optimizes the geometric dimension of a pi-shaped section, increases the effective width of the flange plate, meets the stress requirement of a large-span bridge, particularly designs the part near the fulcrum in a large-span continuous beam, not only increases the tensile area of the upper chord, but also provides the dimension of the pressed lower chord, and simultaneously can be pressed together with the fulcrum bottom plate concrete to form the steel-concrete combined lower chord.
Drawings
FIG. 1 is a schematic cross-sectional view of a separated type Pi-shaped truss web steel box-concrete composite girder bridge;
FIG. 2 is a schematic structural elevation view of the separated type Pi-shaped truss web steel box-concrete composite beam bridge of the invention;
FIG. 3 is a schematic plan view of the separated type Pi-shaped truss web steel box-concrete composite girder bridge;
FIG. 4 is a schematic view of the lower plane of the structure of the separated type Pi-shaped truss web steel box-concrete composite girder bridge;
FIG. 5 is a cross-sectional view of the main spar breakaway top chord of the present invention;
FIG. 6 is a cross-sectional view of a split lower chord of a main spar of the present invention;
FIG. 7 is a schematic cross-sectional view of a combined Pi-shaped truss web steel box-concrete composite girder bridge according to the invention;
FIG. 8 is a schematic structural elevation view of the combined Pi-shaped truss web steel box-concrete composite girder bridge of the invention;
FIG. 9 is a schematic top plan view of the composite Pi-shaped steel truss box-concrete composite girder bridge according to the present invention;
FIG. 10 is a schematic view of the lower plane of the structure of the combined Pi-shaped truss web steel box-concrete composite girder bridge;
FIG. 11 is a cross-sectional view of the main spar modular upper chord of the present invention;
FIG. 12 is a cross-sectional view of a main girder composite lower chord of the present invention;
FIG. 13 is a cross-sectional view of the upper chord of the beam of the present invention;
FIG. 14 is a cross-sectional view of a lower chord of a beam of the present invention;
shown in the figure: 1. a main truss upper chord; 2. a main truss girder lower chord; 3. a main truss web member; 4. the truss sheets are connected with steel plates; 5. a main girder gusset plate; 6. a beam upper chord; 7. a beam lower chord; 8. a cross beam web member; 9. a beam gusset plate; 10. upper parallel connection; 11. lower parallel connection; 12. a bridge deck; 13. wet-seamed decking; 14. a shear pin group; 15. a separate top chord steel top plate; 16. a separate top chord vertical plate; 17. a separate lower chord steel bottom plate; 18. a separate lower chord vertical plate; 19. a combined upper chord steel top plate; 20. a combined upper chord vertical plate; 21. a combined lower chord steel bottom plate; 22. a combined lower chord vertical plate; 23. a beam upper chord steel top plate; 24. a beam upper chord vertical plate; 25. a beam lower chord steel bottom plate; 26. the vertical plate of the lower chord of the crossbeam.
Detailed Description
The technical scheme of the invention is further explained by specific embodiments in the following with the accompanying drawings:
example 1
The invention provides a Pi-shaped truss web steel box-concrete combined beam bridge which comprises a box-type structural truss sheet group, a steel cross beam, an upper flat coupling 10, a lower flat coupling 11, a shear nail group 14, a bridge deck 12 and a wet joint bridge deck 13, and is shown in figures 1-6 and 13-14.
The pi-shaped truss web steel box-concrete composite girder bridge is a separated pi-shaped truss web steel box-concrete composite girder bridge, the width of the bridge is 25.5m, and the span of the bridge is 70 m.
In this embodiment, the box-type structure truss group is formed by connecting two truss sheets through the truss sheet connecting steel plate 4, the truss sheets of each box-type structure are connected through a steel beam, the steel beams are sequentially connected through an upper flat coupling 10 and a lower flat coupling 11, and the bridge deck 12 and the wet joint bridge deck 13 are fixed on the truss sheets of the box-type structure and the steel beams through the shear nail group 14.
The truss sheet is composed of a main truss web member 3 connected with a pi-shaped main truss upper chord member 1 and a pi-shaped main truss lower chord member 2 through a gusset plate 5, and the truss sheet height is 5 m. The center distance between two truss sheets in the box-type structure truss sheet group is 2 m.
The main truss girder upper chord 1 is formed into a pi-shaped section by a separated upper chord steel top plate 15 and two separated upper chord vertical plates 16. The distance between the two split top chord vertical panels 16 is equal to the cross-sectional height of the main spar web 3.
The main truss girder lower chord 2 is formed into a pi-shaped section by a separated lower chord steel bottom plate 17 and two separated lower chord vertical plates 18. The distance between the two split lower chord vertical plates 18 is equal to the cross-sectional height of the main spar web 3.
The main truss girder web members 3 are arranged in a continuous triangular mode, the longitudinal node arrangement distance of the web members is 5m, the section is I-shaped, and the section height is 400 mm.
Wherein the width of the separated upper chord steel top plate 15 is 1000mm, and the thickness is 40 mm; the height of the separate upper chord vertical plates 16 is 400mm, the thickness is 40mm, and the distance between the two separate upper chord vertical plates 16 is 400 mm.
Wherein the width of the separated lower chord steel bottom plate 17 is 1000mm, and the thickness is 50 mm; the height of the separate lower chord vertical plate 18 is 400mm, the thickness is 40mm, and the distance between the two separate lower chord vertical plates 18 is 400 mm.
One of the trusses is connected with a steel plate 4, the length of the trusses is 500mm, the width of the trusses is 1000mm, and the thickness of the steel plate is equal to that of the separated upper chord steel top plate 15 and the separated lower chord steel bottom plate 17 correspondingly.
The steel cross beam is formed by connecting a steel cross beam diagonal web member 8 with a pi-shaped cross beam upper chord 6 and a pi-shaped cross beam lower chord 7 through a gusset plate 9, and the height of the steel cross beam is equal to that of the main truss sheet and is 5 m; the longitudinal arrangement distance of the steel cross beams is 5m, and is the same as the longitudinal node arrangement distance of the web members.
The pi-shaped beam upper chord 6 is formed by welding a beam upper chord steel top plate 23 and two beam upper chord vertical plates 24, and the pi-shaped beam lower chord 7 is formed by welding a beam lower chord steel bottom plate 25 and two beam lower chord vertical plates 26.
The distance between the two beam upper chord vertical plates 24 and the distance between the two beam lower chord vertical plates 26 are equal to the height of the cross section of the beam web member 8 on the steel beam.
The arrangement form of the web members 8 of the steel cross beam is a continuous inverted V-shaped form, the arrangement distance of longitudinal nodes of the web members is 2.9m, the section form is an I-shaped form, and the section height is 300 mm.
Wherein the width of the beam upper chord steel top plate 23 is 500mm, and the thickness is 25 mm; the height of the beam upper chord vertical plates 24 is 230mm, the thickness of the beam upper chord vertical plates is 22mm, and the distance between the two beam upper chord vertical plates 24 is 300 mm.
Wherein the width of the beam lower chord steel bottom plate 25 is 500mm, and the thickness is 25 mm; the height of the beam lower chord vertical plates 26 is 230mm, the thickness of the beam lower chord vertical plates is 22mm, and the distance between the two beam lower chord vertical plates 26 is 300 mm.
The upper chord 6 and the lower chord 7 of the Pi-shaped beam are sequentially connected through an upper parallel connection 10 and a lower parallel connection 11;
the upper parallel connection 10 and the lower parallel connection 11 adopt uniform section size, connection form and arrangement form, the section adopts I-shaped steel, the connection form of bolts is adopted, the local arrangement form is V-shaped, and the whole is symmetrically arranged.
The bridge deck 12 and the wet joint bridge deck 13 are fixed on the main truss upper chord 1 and the cross beam upper chord 6 through shear nail groups 14.
The bridge deck 12 is a prefabricated UHPC waffle type bridge deck, the UHPC waffle type bridge deck is longitudinally and transversely arranged to be in a T-shaped short rib plate form, the total height of the bridge deck is 22cm, the thickness of a flange of the bridge deck is 8cm, the thickness of the short rib plate is 14cm, and the width of the short rib plate is 18 cm.
Wherein the wet joint bridge deck slab 13 adopts UHPC high-strength concrete, and the thickness of the wet joint is 45 cm.
The shear nail group 14 is made of common stud connectors, is 180mm in height and 22mm in diameter, and is welded to the positions of the joints of the upper chord 1 of the main truss girder and the upper chord 6 of the cross beam.
The construction method of the pi-shaped truss web steel box-concrete composite beam bridge comprises the following steps:
1. constructing a bridge foundation, a bridge pier and a capping beam, prefabricating a bridge deck 12 in a factory, and manufacturing each rod piece of the steel truss girder; after the inspection is qualified, transporting the steel plate to a bridge site or a construction site storage place;
2. hoisting the box-type structure truss sheet group section by section; assembling an upper chord member 6, a lower chord member 7 and a web member 8 of the cross beam, connecting the cross beam with a box type structure truss sheet group, an upper flat connection 10 and a lower flat connection 11 to form a space steel truss structure;
3. hoisting the prefabricated bridge deck 12 to a specified position of the bridge deck, and pouring a wet joint bridge deck 13;
4. and (5) installing the anti-collision guardrail to finish waterproof layer, bridge deck pavement and other auxiliary projects.
Example 2
The invention provides a Pi-shaped truss web steel box-concrete combined beam bridge which comprises a box-type structural truss sheet group, steel cross beams, an upper flat coupling 10, a lower flat coupling 11, a shear nail group 14, a bridge deck 12 and a wet joint bridge deck 13, and is shown in figures 7-14.
The pi-shaped truss web steel box-concrete composite girder bridge is a combined pi-shaped truss web steel box-concrete composite girder bridge, the width of the bridge is 25.5m, and the span of the bridge is 90m in single span.
In this embodiment, the box-type structure truss group is composed of two groups of main truss web members 3 connected with a main truss upper chord member 1 and a main truss lower chord member 2 through gusset plates 5, each box-type structure truss group is connected with each other through a steel cross beam, the steel cross beams are sequentially connected through an upper parallel connection 10 and a lower parallel connection 11, and a bridge deck 12 and a wet joint bridge deck 13 are fixed on the box-type structure truss group and the steel cross beams through shear nail groups 14.
The height of the truss sheet group of the box-type structure is 6 m.
The main truss girder upper chord 1 is formed into a pi-shaped section by a combined upper chord steel top plate 19 and four combined upper chord vertical plates 20. The distance between every two of the four combined upper chord vertical plates 20 is equal to the section height of the main truss web member 3.
The main truss girder lower chord 2 is formed into a pi-shaped section by a combined lower chord steel bottom plate 21 and four combined lower chord vertical plates 22. The distance between every two of the four combined lower chord vertical plates 22 is equal to the section height of the main truss web member 3.
The main truss web members 3 are arranged in a continuous triangular mode, the longitudinal node arrangement distance of the web members is 6m, the section is in an I shape, the section height is 458mm, and the center distance of two groups of main truss web members 3 in the box-type truss group is 2 m.
Wherein the width of the combined upper chord steel top plate 19 is 3000mm, and the thickness is 45 mm; the height of the combined type upper chord vertical plates 20 is 400mm, the thickness of the combined type upper chord vertical plates is 45mm, and the distance between every two combined type upper chord vertical plates 20 is 458 mm.
Wherein the width of the combined lower chord steel bottom plate 21 is 3000mm, and the thickness is 55 mm; the height of the combined lower chord vertical plate 22 is 400mm, the thickness is 45mm, and the distance between every two combined lower chord vertical plates 22 is 458 mm.
The steel beam is composed of a steel beam diagonal web member 8 and a pi-shaped beam upper chord member 6 and a pi-shaped beam lower chord member 7 which are connected through a gusset plate 9, and the height of the steel beam is equal to that of the box-type structure truss sheet group and is 6 m; the longitudinal arrangement distance of the steel cross beams is 6m, and is the same as the longitudinal node arrangement distance of the web members.
The pi-shaped beam upper chord 6 is formed by welding a beam upper chord steel top plate 23 and two beam upper chord vertical plates 24, and the pi-shaped beam lower chord 7 is formed by welding a beam lower chord steel bottom plate 25 and two beam lower chord vertical plates 26.
The distance between the two beam upper chord vertical plates 24 and the distance between the two beam lower chord vertical plates 26 are equal to the height of the cross section of the beam web member 8 on the steel beam.
The arrangement form of the web members 8 of the steel cross beam is a continuous inverted V-shaped form, the arrangement distance of longitudinal nodes of the web members is 2.9m, the section form is an I-shaped form, and the section height is 338 mm.
Wherein the width of the beam upper chord steel top plate 23 is 500mm, and the thickness thereof is 28 mm; the height of the beam upper chord vertical plates 24 is 250mm, the thickness of the beam upper chord vertical plates is 25mm, and the distance between the two beam upper chord vertical plates 24 is 338 mm.
Wherein the width of the beam lower chord steel bottom plate 25 is 500mm, and the thickness is 28 mm; the height of the beam lower chord vertical plates 26 is 250mm, the thickness of the beam lower chord vertical plates is 25mm, and the distance between the two beam lower chord vertical plates 26 is 338 mm.
The upper chord 6 and the lower chord 7 of the Pi-shaped beam are sequentially connected through an upper parallel connection 10 and a lower parallel connection 11;
the upper parallel connection 10 and the lower parallel connection 11 adopt uniform section size, connection form and arrangement form, the section is rectangular section steel, the welding connection form is adopted, the local arrangement form is N-shaped, and the whole is symmetrically arranged.
The bridge deck 12 and the wet joint bridge deck 13 are fixed on the main truss upper chord 1 and the cross beam upper chord 6 through shear nail groups 14.
The bridge deck 12 is a prefabricated common concrete bridge deck, and the thickness of the bridge deck is 25 cm.
Wherein the wet joint bridge deck slab 13 adopts UHPC high-strength concrete, and the wet joint thickness is 50 cm.
The shear nail group 14 is made of common stud connectors, is 200mm in height and 25mm in diameter, and is welded to the positions of the joints of the upper chord 1 of the main truss girder and the upper chord 6 of the cross beam.
The construction method of the pi-shaped truss web steel box-concrete composite beam bridge comprises the following steps:
1. constructing a bridge foundation, a bridge pier and a capping beam, prefabricating a bridge deck 12 in a factory, and manufacturing each rod piece of the steel truss girder; after the inspection is qualified, transporting the steel plate to a bridge site or a construction site storage place;
2. pushing the box-type structure truss sheet group to a bridge position, assembling an upper chord member 6, a lower chord member 7 and a web member 8 of the cross beam, and connecting the cross beam with the box-type structure truss sheet group, an upper flat connection 10 and a lower flat connection 11 to form a space steel truss structure;
3. hoisting part of the prefabricated bridge deck 12 above the truss sheet group of the box-type structure, pouring part of the wet joint bridge deck 13, and hoisting the rest of the prefabricated bridge deck 12 and pouring the rest of the wet joint bridge deck 13 after the part of the wet joint concrete reaches the design strength.
4. And (5) installing the anti-collision guardrail to finish waterproof layer, bridge deck pavement and other auxiliary projects.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a pi type purlin web steel case-concrete composite beam bridge, includes box structure purlin piece group, steel crossbeam, goes up the parallel connection, parallel connection down, shear force nail crowd, decking and wet seam decking, its characterized in that: the box type structure truss sheet group is formed by connecting a main truss web member with a main truss upper chord member and a pi-shaped main truss lower chord member through a gusset plate and connecting truss sheets;
the truss groups are connected through steel crossbeams, and the steel crossbeam diagonal web members are connected with the pi-shaped crossbeam upper chord members and the pi-shaped crossbeam lower chord members through gusset plates;
the upper chord of the pi-shaped cross beam and the lower chord of the pi-shaped cross beam are sequentially connected through an upper parallel connection and a lower parallel connection;
the bridge deck and the wet joint bridge deck are fixed on the upper chord of the main truss and the upper chord of the cross beam through shear nail groups.
2. The pi-type truss web steel box-concrete composite girder bridge as claimed in claim 1, wherein: the pi-shaped main truss upper chord is divided into a separated main truss upper chord and a combined main truss upper chord, the separated main truss upper chord is composed of a separated upper chord steel top plate and two separated upper chord vertical plates, and the combined main truss upper chord is composed of a combined upper chord steel top plate and four combined upper chord vertical plates.
3. The pi-type truss web steel box-concrete composite girder bridge as claimed in claim 2, wherein: the distance between the two separated upper chord vertical plates and the distance between every two combined upper chord vertical plates are equal to the height of the section of the main truss girder web.
4. The pi-type truss web steel box-concrete composite girder bridge as claimed in claim 1, wherein: the pi-shaped main truss lower chord is divided into a separated main truss lower chord and a combined main truss lower chord, the separated main truss lower chord is composed of a separated lower chord steel bottom plate and two separated lower chord vertical plates, and the combined main truss lower chord is composed of a combined lower chord steel bottom plate and four combined lower chord vertical plates.
5. The pi-shaped truss web steel box-concrete composite girder bridge as claimed in claim 4, wherein: the distance between the two separated lower chord vertical plates and the distance between every two combined lower chord vertical plates are equal to the height of the section of the main truss girder web.
6. The pi-type truss web steel box-concrete composite girder bridge as claimed in claim 1, wherein: the pi-shaped upper chord of the cross beam is formed by welding an upper chord steel top plate of the cross beam and two vertical chord plates of the cross beam, and the pi-shaped lower chord of the cross beam is formed by welding a lower chord steel bottom plate of the cross beam and two vertical chord plates of the cross beam.
7. The pi-type truss web steel box-concrete composite girder bridge as claimed in claim 1, wherein: the distance between the vertical plates of the upper chords of the two cross beams and the distance between the vertical plates of the lower chords of the two cross beams are equal to the cross section height of the web member of the cross beam on the steel cross beam.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112049253A (en) * | 2020-09-14 | 2020-12-08 | 北京中外建建筑设计有限公司 | Truss body and concrete structure connecting node, truss and method |
| CN115162135A (en) * | 2022-07-18 | 2022-10-11 | 甘肃省交通规划勘察设计院股份有限公司 | Novel steel truss-concrete double-layer combined continuous beam bridge and construction method |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049253A (en) * | 2020-09-14 | 2020-12-08 | 北京中外建建筑设计有限公司 | Truss body and concrete structure connecting node, truss and method |
| CN112049253B (en) * | 2020-09-14 | 2021-07-30 | 北京中外建建筑设计有限公司 | Truss body and concrete structure connecting node, truss and method |
| CN115162135A (en) * | 2022-07-18 | 2022-10-11 | 甘肃省交通规划勘察设计院股份有限公司 | Novel steel truss-concrete double-layer combined continuous beam bridge and construction method |
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