A π-shaped truss-web steel box-concrete composite beam bridge

Abstract

The present invention relates to a π-shaped truss-web steel box-concrete composite beam bridge; it comprises a box-type structure truss group, a steel crossbeam, an upper flat joint, a lower flat joint, a shear nail group, a bridge deck and a wet joint bridge deck, the box-type structure truss group is composed of a main truss web member connecting a main truss upper chord and a π-shaped main truss lower chord through a node plate, and the trusses are connected to form a truss group; the truss groups are connected by a steel crossbeam, and the steel crossbeam diagonal web member is connected to the π-shaped crossbeam upper chord and the π-shaped crossbeam lower chord through a node plate; multiple π-shaped crossbeam upper chords and π-shaped crossbeam lower chords are sequentially connected through an upper flat joint and a lower flat joint. The device improves the structural strength, rigidity and stability, is easy to design and construct, and makes the structure more reasonably stressed.

Description

Technical Field

[0001] The invention relates to the technical field of bridges, and in particular to a π-shaped truss web steel box-concrete composite beam bridge. Background Art

[0002] Although traditional steel truss bridges are relatively simple to design, manufacture and install, and are suitable for a wide range of spans and are widely used, they have a large structural space, low overall structural stiffness, and a high beam height, generally 1 / 12 to 1 / 8 of the span. The lateral stiffness of steel trusses is weak, and a large number of transverse supports are required to connect the trusses into a whole so that they have spatial stiffness to resist longitudinal and transverse forces. The cross-section of the supports is determined according to requirements such as the structural slenderness ratio, and the structural materials are not economical. The fatigue stress of the upper and lower chords is large, and the chord size is often controlled by fatigue problems. The bridge deck pavement and the steel trusses share the live load, and the pavement is prone to various degrees of defects.

[0003] At the same time, the existing steel-concrete composite beam bridges are mostly I-shaped composite beams, box-shaped composite beams, and corrugated steel web composite beams. The traditional composite beam structure is single, with small bearing capacity, weak bending stiffness, low economy, poor spanning capacity, and cannot meet the use of large-span bridges.

[0004] Traditional steel truss bridge chords mostly use box-shaped and I-shaped sections, which results in excessive self-weight of the steel truss, high economic indicators, large welding workload, too many and concentrated welds, and a great influence of welding residual stress on the precise connection of the structure and the fatigue strength after the bridge is completed, which is not conducive to later inspection and maintenance. At the same time, the node plate size is too large, affecting the spatial permeability of the truss bridge. Summary of the invention

[0005] In order to overcome the shortcomings of steel truss bridges and composite steel truss bridges, the present invention provides a π-shaped truss steel box-concrete composite beam bridge that can ensure the overall working performance of the steel truss and the concrete bridge deck, improve the strength, rigidity and stability of the structure, and is easy to design and construct, making the structure more reasonably stressed.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A π-shaped truss web steel box-concrete composite beam bridge, comprising a box-shaped structure truss plate group, a steel crossbeam, an upper flat joint 10, a lower flat joint 11, a shear nail group 14, a bridge deck 12 and a wet joint bridge deck 13. The box-shaped structure truss plate group is composed of a main truss web member 3 connected to a π-shaped main truss upper chord member 1 and a π-shaped main truss lower chord member 2 through a main truss node plate 5, and the trusses are connected to form a truss plate group;

[0008] The truss groups are connected by steel cross beams, and the steel cross beam diagonal web members 8 are connected to the π-shaped cross beam upper chord member 6 and the π-shaped cross beam lower chord member 7 through the cross beam node plate 9;

[0009] Multiple π-shaped upper chord rods 6 and π-shaped lower chord rods 7 are connected in sequence through upper parallel links 10 and lower parallel links 11;

[0010] The bridge deck 12 and the wet joint bridge deck 13 are fixed to the main truss upper chord 1 and the cross beam upper chord 6 through a shear nail group 14 .

[0011] The π-shaped main truss upper chord 1 is divided into a separate main truss upper chord and a combined main truss upper chord. The separate main truss upper chord is composed of a separate upper chord steel top plate 15 and two separate 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.

[0012] The distance between the two separate upper chord vertical plates 16 and the distance between every two of the four combined upper chord vertical plates 20 are both equal to the cross-sectional height of the main truss web member 3 .

[0013] The main truss lower chord 2 of the π-type structure is divided into a separate main truss lower chord and a combined main truss lower chord. The separate main truss lower chord is composed of a separate lower chord steel bottom plate 17 and two separate lower chord vertical plates 18, and the combined main truss lower chord is composed of a combined lower chord steel bottom plate 21 and four combined lower chord vertical plates 22.

[0014] The distance between the two separated lower chord vertical plates 18 and the distance between each two of the four combined lower chord vertical plates 22 are both equal to the cross-sectional height of the main truss web member 3 .

[0015] The π-shaped crossbeam upper chord 6 is welded by a crossbeam upper chord steel top plate 23 and two crossbeam upper chord vertical plates 24 , and the π-shaped crossbeam lower chord 7 is welded by a crossbeam lower chord steel bottom plate 25 and two crossbeam lower chord vertical plates 26 .

[0016] The distance between the two vertical plates 24 of the upper chords of the cross beams and the distance between the two vertical plates 26 of the lower chords of the cross beams are both equal to the cross-sectional height of the cross beam web members 8 on the steel cross beams.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention has the characteristics of clear force transmission path of box-type structural truss group and flexible design. The size of the chord can increase the width and thickness of the horizontal steel plate according to the force. The main truss web and the crossbeam web have various structural forms to choose from, such as I-shaped steel, welded I-shaped steel, welded box-type structure, etc., which increases the cross-section utilization rate and meets the needs of different spans and different force positions.

[0019] 2. The cross-sections of the π-shaped main truss upper chord and the main truss lower chord of the present invention are open cross-sections, which can be repaired, inspected and maintained, and have the characteristics of long life and durability.

[0020] 3. The cross-sectional size of the box-type structure truss group of the present invention is relatively small, and the structural quality can be guaranteed during transportation. During the erection, construction methods such as jacking and hoisting can be adopted to enrich the construction methods. During the installation, the box-type structure truss group is used to lay a temporary working platform, which is convenient for subsequent construction and improves economic benefits.

[0021] 4. The present invention adopts a truss-type crossbeam structure with clear structural force, which improves the torsional resistance of the truss and makes the main truss group evenly stressed. The upper chord of the crossbeam is compressed together with the bridge deck, and the lower chord of the crossbeam is tensile. The web of the crossbeam is divided into a tension diagonal web and a compression diagonal web, which jointly resist the shear force. The free length of the crossbeam chord outside the plane is greatly reduced by the arrangement of upper and lower parallel joints.

[0022] 5. The present invention sets a shear nail group at the beam node to connect the steel truss and the bridge deck. The constant load of the bridge deck, paved guardrail and other loads and vehicle loads are transmitted to the steel beam through the shear nail group. The transmission of the upper load is mainly axial force, which reduces the influence of additional bending moment and other factors on the internal force of the main truss and beam, saving materials.

[0023] 6. The present invention can use a group of pull-out-resistant but not shear-resistant shear nails near the support points in multi-span continuous beams to connect the steel trusses and the bridge deck, thereby providing anti-lifting force, reducing the longitudinal shear flow at the steel-concrete interface, and effectively improving the performance of the bridge deck.

[0024] 7. In the present invention, UHPC high-strength concrete, micro-expansive concrete and other materials can be poured into the cavity of the box-type structure truss group at the fulcrum position of the steel truss beam to form a combined structure to bear force, increase the fulcrum section stiffness, enhance the stability of the support section, and have the advantages of large torsional stiffness, strong shear resistance, and good overall performance.

[0025] 8. The box-type structure truss group, beam, flat joint and node plate of the present invention are all steel structures, and the steel material has stable performance, which can easily ensure the safety of the structure. The connection between structures can be welded or bolted, which is convenient for processing and construction.

[0026] 9. The bridge deck of the present invention includes a composite bridge deck of corrugated steel plates, a prefabricated UHPC waffle-shaped bridge deck, and a prefabricated ordinary concrete bridge deck. The bridge deck has a long manufacturing age, small shrinkage and creep in the later period, is factory-made, and has excellent quality. It reduces the workload of installing formwork in the later period and simplifies the construction process. The combination of steel and concrete bridge decks and the performance of the two materials improve the bearing capacity of the steel truss composite beam, which has a broader application prospect than traditional steel truss beams.

[0027] 10. The separated π-shaped truss web steel box-concrete composite beam bridge of the present invention has clear structural force, saves steel, has a beautiful and simple appearance, and can be widely used in the design of medium and large span bridges.

[0028] 11. The combined π-shaped truss-web steel box-concrete composite beam bridge of the present invention has a clear structural force, optimizes the geometric dimensions of the π-shaped section, increases the effective width of the flange plate, and meets the force requirements of large-span bridges. In particular, the design of the area near the support in the large-span continuous beam not only increases the tensile area of ​​the upper chord, but also provides the size of the compressed lower chord. At the same time, it can be compressed together with the support bottom plate concrete to form a steel-concrete composite lower chord. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic cross-sectional view of a separated π-shaped truss web steel box-concrete composite beam bridge of the present invention;

[0030] Figure 2 It is a structural elevation schematic diagram of a separated π-shaped truss-web steel box-concrete composite beam bridge of the present invention;

[0031] Figure 3 It is a schematic structural plan view of a separated π-shaped truss web steel box-concrete composite beam bridge of the present invention;

[0032] Figure 4 It is a schematic diagram of the lower structural plane of the separated π-shaped truss web steel box-concrete composite beam bridge of the present invention;

[0033] Figure 5 This is a cross-sectional view of the separated upper chord of the main truss of the present invention;

[0034] Figure 6 This is a cross-sectional view of the separated lower chord of the main truss of the present invention;

[0035] Figure 7 It is a schematic cross-sectional view of a combined π-shaped truss web steel box-concrete composite beam bridge of the present invention;

[0036] Figure 8 It is a schematic structural elevation diagram of a combined π-shaped truss web steel box-concrete composite beam bridge of the present invention;

[0037] Fig. 9 It is a schematic structural plan view of a combined π-shaped truss web steel box-concrete composite beam bridge of the present invention;

[0038] Fig.10 It is a schematic diagram of the lower structural plane of the combined π-shaped truss web steel box-concrete composite beam bridge of the present invention;

[0039] Fig.11 A cross-sectional view of the combined upper chord of the main truss of the present invention;

[0040] Fig.12 A cross-sectional view of the combined lower chord of the main truss of the present invention;

[0041] Fig.13 A cross-sectional view of the upper chord of the cross beam of the present invention;

[0042] Fig.14 A cross-sectional view of the lower chord of the cross beam of the present invention;

[0043] As shown in the figure: 1. Main truss upper chord; 2. Main truss lower chord; 3. Main truss web; 4. Truss connecting steel plate; 5. Main truss node plate; 6. Transverse beam upper chord; 7. Transverse beam lower chord; 8. Transverse beam web; 9. Transverse beam node plate; 10. Upper flat joint; 11. Lower flat joint; 12. Bridge deck; 13. Wet joint bridge deck; 14. Shear nail group; 15. Separate upper chord steel top plate; 16. 1. Separate upper chord vertical plate; 17. Separate lower chord steel bottom plate; 18. Separate lower chord vertical plate; 19. Combined upper chord steel top plate; 20. Combined upper chord vertical plate; 21. Combined lower chord steel bottom plate; 22. Combined lower chord vertical plate; 23. Crossbeam upper chord steel top plate; 24. Crossbeam upper chord vertical plate; 25. Crossbeam lower chord steel bottom plate; 26. Crossbeam lower chord vertical plate. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific embodiments:

[0045] Example 1

[0046] The present invention provides a π-shaped truss web steel box-concrete composite beam bridge, which includes a box-type structure truss group, a steel cross beam, an upper flat joint 10, a lower flat joint 11, a shear nail group 14, a bridge deck 12 and a wet joint bridge deck 13. Figures 1 to 6 , as shown in 13-14.

[0047] The π-shaped truss web steel box-concrete composite beam bridge described in this embodiment is a separated π-shaped truss web steel box-concrete composite beam bridge, the bridge width is 25.5m, and the bridge span is 70m for a single span.

[0048] In this embodiment, the box-type structure truss group is composed of two trusses connected by a truss connecting steel plate 4, and each box-type structure truss group is connected by a steel cross beam, and the steel cross beam is connected in sequence by an upper horizontal link 10 and a lower horizontal link 11. The bridge deck 12 and the wet joint bridge deck 13 are fixed to the box-type structure truss group and the steel cross beam by a shear nail group 14.

[0049] The truss piece is composed of a main truss web member 3 connected to a π-shaped main truss upper chord member 1 and a π-shaped main truss lower chord member 2 through a main truss node plate 5, and the truss piece height is 5m. The center distance between two trusses in the box-type structure truss piece group is 2m.

[0050] The main truss upper chord 1 is composed of a separate upper chord steel top plate 15 and two separate upper chord vertical plates 16 to form a π-shaped cross section. The distance between the two separate upper chord vertical plates 16 is equal to the cross-sectional height of the main truss web member 3 .

[0051] The main truss lower chord 2 is composed of a separate lower chord steel bottom plate 17 and two separate lower chord vertical plates 18 to form a π-shaped cross section. The distance between the two separate lower chord vertical plates 18 is equal to the cross-sectional height of the main truss web member 3.

[0052] The web members 3 of the main truss are arranged in a continuous triangle, the longitudinal node arrangement spacing of the web members is 5m, the cross-section is I-shaped, and the cross-section height is 400mm.

[0053] The width of the separated upper chord steel top plate 15 is 1000 mm and the thickness is 40 mm; the height of the separated upper chord vertical plate 16 is 400 mm and the thickness is 40 mm, and the distance between the two separated upper chord vertical plates 16 is 400 mm.

[0054] The width of the separated lower chord steel bottom plate 17 is 1000 mm and the thickness is 50 mm; the height of the separated lower chord vertical plate 18 is 400 mm and the thickness is 40 mm, and the distance between the two separated lower chord vertical plates 18 is 400 mm.

[0055] One of the truss pieces is connected to the steel plate 4 , which has a length of 500 mm and a width of 1000 mm. 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 .

[0056] The steel crossbeam is composed of a steel crossbeam diagonal web member 8 connected to a π-shaped crossbeam upper chord member 6 and a π-shaped crossbeam lower chord member 7 through a crossbeam node plate 9. The height of the steel crossbeam is equal to that of the main truss, which is 5m. The longitudinal arrangement spacing of the steel crossbeam is 5m, which is the same as the longitudinal node arrangement spacing of the web member.

[0057] The π-shaped crossbeam upper chord 6 is welded by a crossbeam upper chord steel top plate 23 and two crossbeam upper chord vertical plates 24 , and the π-shaped crossbeam lower chord 7 is welded by a crossbeam lower chord steel bottom plate 25 and two crossbeam lower chord vertical plates 26 .

[0058] The distance between the two vertical plates 24 of the upper chords of the cross beams and the distance between the two vertical plates 26 of the lower chords of the cross beams are both equal to the cross-sectional height of the cross beam web members 8 on the steel cross beams.

[0059] The web members 8 of the steel cross beam are arranged in a continuous inverted V-type, the longitudinal node arrangement spacing of the web members is 2.9m, the cross-section is I-shaped, and the cross-section height is 300mm.

[0060] The width of the cross beam upper chord steel top plate 23 is 500 mm and the thickness is 25 mm; the height of the cross beam upper chord vertical plate 24 is 230 mm and the thickness is 22 mm, and the distance between the two cross beam upper chord vertical plates 24 is 300 mm.

[0061] The crossbeam lower chord steel bottom plate 25 has a width of 500 mm and a thickness of 25 mm; the crossbeam lower chord vertical plate 26 has a height of 230 mm and a thickness of 22 mm, and the distance between the two crossbeam lower chord vertical plates 26 is 300 mm.

[0062] Multiple π-shaped upper chord rods 6 and π-shaped lower chord rods 7 are connected in sequence through upper parallel links 10 and lower parallel links 11;

[0063] The upper parallel link 10 and the lower parallel link 11 adopt uniform cross-sectional dimensions, connection forms, and layout forms. The cross-section adopts I-shaped steel, the connection form adopts bolts, the local layout form is V-shaped, and the overall layout is symmetrical.

[0064] The bridge deck 12 and the wet joint bridge deck 13 are fixed to the main truss upper chord 1 and the cross beam upper chord 6 through a shear nail group 14 .

[0065] The bridge deck 12 adopts a prefabricated UHPC waffle-type bridge deck. The UHPC waffle-type bridge deck is arranged in a T-shaped short rib plate in the longitudinal and transverse directions. The total height of the bridge deck is 22 cm, the flange thickness of the bridge deck is 8 cm, the short rib plate thickness is 14 cm, and the width is 18 cm.

[0066] The wet joint bridge deck 13 is made of UHPC high-strength concrete, and the wet joint thickness is 45 cm.

[0067] The shear nail group 14 is a common bolt connector with a height of 180 mm and a diameter of 22 mm, which is welded at the node positions of the upper chord rod 1 of the main truss and the upper chord rod 6 of the cross beam.

[0068] The construction method of a π-shaped truss web steel box-concrete composite beam bridge described in this embodiment is as follows:

[0069] 1. Construct bridge foundations, piers and cap beams, prefabricate bridge decks in factories, and make various rods of steel trusses; after passing the inspection, transport them to the bridge site or the storage place at the construction site;

[0070] 2. Lift the box-type structure truss group section by section; assemble the upper chord rod 6, the lower chord rod 7 and the web rod 8 of the crossbeam, connect the crossbeam with the box-type structure truss group and the upper horizontal joint 10 and the lower horizontal joint 11 to form a spatial steel truss structure;

[0071] 3. Hoist the prefabricated bridge deck 12 to the designated position of the bridge deck, and cast the wet joint bridge deck 13;

[0072] 4. Install anti-collision guardrails, complete waterproofing layer, bridge deck paving and other ancillary projects.

[0073] Example 2

[0074] The present invention provides a π-shaped truss web steel box-concrete composite beam bridge, which includes a box-type structure truss group, a steel cross beam, an upper flat joint 10, a lower flat joint 11, a shear nail group 14, a bridge deck 12 and a wet joint bridge deck 13. Figures 7 to 14 shown.

[0075] The π-shaped truss web steel box-concrete composite beam bridge described in this embodiment is a combined π-shaped truss web steel box-concrete composite beam bridge, the bridge width is 25.5m, and the bridge span is 90m for a single span.

[0076] In this embodiment, the box-type structure truss group is composed of two groups of main truss web members 3 connecting the main truss upper chord member 1 and the main truss lower chord member 2 through the main truss node plate 5. The box-type structure truss groups are connected by steel cross beams, and the steel cross beams are connected in sequence through upper horizontal links 10 and lower horizontal links 11. The bridge deck 12 and the wet joint bridge deck 13 are fixed to the box-type structure truss group and the steel cross beams through a shear nail group 14.

[0077] The height of the box-type structure truss group is 6m.

[0078] The main truss upper chord 1 is composed of a combined upper chord steel top plate 19 and four combined upper chord vertical plates 20 to form a π-shaped cross section. The distance between each two of the four combined upper chord vertical plates 20 is equal to the cross-sectional height of the main truss web member 3 .

[0079] The main truss lower chord 2 is composed of a combined lower chord steel bottom plate 21 and four combined lower chord vertical plates 22 to form a π-shaped cross section. The distance between each two of the four combined lower chord vertical plates 22 is equal to the cross-sectional height of the main truss web 3.

[0080] The main truss web members 3 are arranged in a continuous triangle, the longitudinal node arrangement spacing of the web members is 6m, the cross-section is I-shaped, the cross-section height is 458mm, and the center spacing between two groups of main truss web members 3 in the box-type structure truss group is 2m.

[0081] The width of the combined upper chord steel top plate 19 is 3000 mm and the thickness is 45 mm; the height of the combined upper chord vertical plate 20 is 400 mm and the thickness is 45 mm, and the distance between every two combined upper chord vertical plates 20 is 458 mm.

[0082] The width of the combined lower chord steel bottom plate 21 is 3000 mm and the thickness is 55 mm; the height of the combined lower chord vertical plate 22 is 400 mm and the thickness is 45 mm, and the distance between every two combined lower chord vertical plates 22 is 458 mm.

[0083] The steel crossbeam is composed of a steel crossbeam diagonal web member 8 connected to a π-shaped crossbeam upper chord member 6 and a π-shaped crossbeam lower chord member 7 through a crossbeam node plate 9. The height of the steel crossbeam is equal to the height of the box-type structure truss group, which is 6m. The longitudinal arrangement spacing of the steel crossbeam is 6m, which is the same as the longitudinal node arrangement spacing of the web member.

[0084] The π-shaped crossbeam upper chord 6 is welded by a crossbeam upper chord steel top plate 23 and two crossbeam upper chord vertical plates 24 , and the π-shaped crossbeam lower chord 7 is welded by a crossbeam lower chord steel bottom plate 25 and two crossbeam lower chord vertical plates 26 .

[0085] The distance between the two vertical plates 24 of the upper chords of the cross beams and the distance between the two vertical plates 26 of the lower chords of the cross beams are both equal to the cross-sectional height of the cross beam web members 8 on the steel cross beams.

[0086] The web members 8 of the steel cross beam are arranged in a continuous inverted V-type, the longitudinal node arrangement spacing of the web members is 2.9m, the cross-section is I-shaped, and the cross-section height is 338mm.

[0087] The width of the cross beam upper chord steel top plate 23 is 500 mm and the thickness is 28 mm; the height of the cross beam upper chord vertical plate 24 is 250 mm and the thickness is 25 mm, and the distance between the two cross beam upper chord vertical plates 24 is 338 mm.

[0088] The crossbeam lower chord steel bottom plate 25 has a width of 500 mm and a thickness of 28 mm; the crossbeam lower chord vertical plate 26 has a height of 250 mm and a thickness of 25 mm, and the distance between the two crossbeam lower chord vertical plates 26 is 338 mm.

[0089] Multiple π-shaped upper chord rods 6 and π-shaped lower chord rods 7 are connected in sequence through upper parallel links 10 and lower parallel links 11;

[0090] The upper parallel link 10 and the lower parallel link 11 adopt uniform cross-sectional dimensions, connection forms and layout forms. The cross-section is rectangular steel and the connection form is welded. The local layout form is N-shaped and the overall layout is symmetrical.

[0091] The bridge deck 12 and the wet joint bridge deck 13 are fixed to the main truss upper chord 1 and the cross beam upper chord 6 through a shear nail group 14 .

[0092] The bridge deck 12 is a prefabricated ordinary concrete bridge deck with a thickness of 25 cm.

[0093] The wet joint bridge deck 13 is made of UHPC high-strength concrete, and the wet joint thickness is 50 cm.

[0094] The shear nail group 14 is a common bolt connector with a height of 200 mm and a diameter of 25 mm, which is welded at the node positions of the upper chord rod 1 of the main truss and the upper chord rod 6 of the cross beam.

[0095] The construction method of a π-shaped truss web steel box-concrete composite beam bridge described in this embodiment is as follows:

[0096] 1. Construct bridge foundations, piers and cap beams, prefabricate bridge decks in factories, and make various rods of steel trusses; after passing the inspection, transport them to the bridge site or the storage place at the construction site;

[0097] 2. Push the box-type structure truss group to the bridge position, assemble the upper chord 6, lower chord 7 and web 8 of the crossbeam, connect the crossbeam with the box-type structure truss group and the upper horizontal joint 10 and the lower horizontal joint 11, and form a spatial steel truss structure;

[0098] 3. Lift the part of precast bridge deck 12 above the box-type structure truss group, cast part of the wet joint bridge deck 13, and after the wet joint concrete of this part reaches the design strength, lift the remaining precast bridge deck 12 and cast the remaining wet joint bridge deck 13.

[0099] 4. Install anti-collision guardrails, complete waterproofing layer, bridge deck paving and other ancillary projects.

[0100] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0101] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A π-shaped truss web steel box-concrete composite beam bridge, comprising a box-type structural truss group, a steel cross beam, an upper flat joint, a lower flat joint, a shear nail group, a bridge deck and a wet joint bridge deck, characterized in that: The box-type structure truss group is formed by connecting the main truss web bar to the π-shaped main truss upper chord bar and the π-shaped main truss lower chord bar through the main truss node plate to form a truss group; The truss segments are connected by steel beams, and the steel beam diagonal web members are connected to the π-shaped upper beam chord and the π-shaped lower beam chord through the beam node plate; A plurality of π-shaped upper chord bars of the cross beam and a plurality of π-shaped lower chord bars of the 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 to the upper chord of the main truss and the upper chord of the cross beam through a shear nail group; The π-shaped main truss upper chord is a combined main truss upper chord, and the combined main truss upper chord is composed of a combined upper chord steel top plate and four combined upper chord vertical plates; The π-shaped main truss lower chord is a combined main truss lower chord, and the combined main truss lower chord is composed of a combined lower chord steel bottom plate and four combined lower chord vertical plates; The π-shaped crossbeam upper chord is welded by a crossbeam upper chord steel top plate and two crossbeam upper chord vertical plates, and the π-shaped crossbeam lower chord is welded by a crossbeam lower chord steel bottom plate and two crossbeam lower chord vertical plates.

2. The π-shaped truss web steel box-concrete composite beam bridge according to claim 1, characterized in that: The distance between each two of the four combined upper chord vertical plates is equal to the cross-sectional height of the main truss web member.

3. The π-shaped truss web steel box-concrete composite beam bridge according to claim 1, characterized in that: The distance between each two of the four combined lower chord vertical plates is equal to the cross-sectional height of the main truss web member.

4. The π-shaped truss web steel box-concrete composite beam bridge according to claim 1, characterized in that: 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 both equal to the cross beam web section height on the steel cross beam.

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