Steel-concrete composite beam and cable-stayed bridge

Abstract

The embodiment of the present application provides a steel-concrete composite beam and a cable-stayed bridge, comprising a main span truss beam and a side span truss beam, wherein the main span truss beam comprises a main span concrete bridge deck, two main span steel trusses and a main span steel lower parallel joint, wherein the two main span steel trusses are symmetrically arranged along the transverse direction of the bridge, the main span concrete bridge deck is connected to the tops of the two main span steel trusses, and the main span steel lower parallel joint is connected to the bottoms of the two main span steel trusses; at least one end of the main span truss beam at both ends along the longitudinal direction of the bridge is provided with a side span truss beam, wherein the side span truss beam comprises a side span concrete bridge deck, two side span steel trusses and a side span concrete lower parallel joint, wherein the two side span steel trusses are symmetrically arranged along the transverse direction of the bridge, the side span concrete bridge deck is connected to the tops of the side span steel trusses, and the side span concrete lower parallel joint is connected to the bottoms of the side span steel trusses. The steel-concrete composite beam and the cable-stayed bridge of the embodiment of the present application improve the economic efficiency of the project while ensuring the spanning capacity of the cable-stayed bridge.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a steel-concrete composite beam and a cable-stayed bridge. Background Art

[0002] Steel truss cable-stayed bridges have large spanning capacity, high degree of industrialized manufacturing, fast construction and installation, easy repair and replacement of bridge components, and high structural rigidity and integrity;

[0003] However, steel truss cable-stayed bridges use a large amount of steel, which is prone to rust, has high maintenance costs, and is less economical. Summary of the Invention

[0004] In view of this, the main purpose of the embodiments of the present application is to provide a steel-concrete composite beam and cable-stayed bridge that is relatively economical while ensuring the spanning capacity of the bridge.

[0005] To achieve the above objectives, the technical solution of the embodiment of the present application is implemented as follows:

[0006] A first aspect of an embodiment of the present application provides a steel-concrete composite beam, comprising:

[0007] The main span truss beam comprises a main span concrete bridge deck, two main span steel trusses and a main span steel lower parallel connection. The two main span steel trusses are symmetrically arranged along the transverse direction of the bridge. The main span concrete bridge deck is connected to the top of the two main span steel trusses, and the main span steel lower parallel connection is connected to the bottom of the two main span steel trusses.

[0008] A side span truss beam is provided at at least one of the two opposite ends of the main span truss beam along the longitudinal direction of the bridge. The side span truss beam comprises a side span concrete deck, two side span steel trusses and a side span concrete lower parallel joint. The two side span steel trusses are symmetrically arranged along the transverse direction of the bridge. The side span concrete deck is connected to the top of the side span steel trusses, and the side span concrete lower parallel joint is connected to the bottom of the side span steel trusses.

[0009] In one embodiment, each side span steel truss includes a side span steel lower chord and multiple side span steel webs, the bottom ends of the multiple side span steel webs are connected to the side span steel lower chord, and the side span concrete lower flat joint is connected to the side span steel lower chord of the two side span steel trusses.

[0010] In one embodiment, the side span truss beam further includes a plurality of side span steel cross beams arranged between the two side span steel trusses, the plurality of side span steel cross beams being arranged at intervals along the longitudinal direction of the bridge, and the opposite ends of each side span steel cross beam along the transverse direction of the bridge are respectively connected to the side span steel web members of the corresponding side span truss beam, and the side span concrete bridge deck is laid on the plurality of side span steel cross beams.

[0011] In one embodiment, the side span truss beam further includes a side span stiffening plate, and the side span stiffening plate is arranged at a corner point formed between the interconnected side span steel beam and the side span steel web member.

[0012] In one embodiment, each of the side span steel trusses further includes a concrete filling layer, and the concrete filling layer is filled in the side span steel lower chord.

[0013] In one embodiment, each side span steel truss further includes a side span steel upper chord, the side span steel upper chord is connected to the top ends of the multiple side span steel webs, and the side span concrete bridge deck is connected to the side span steel upper chords of the two side span steel trusses.

[0014] In one embodiment, at least a portion of the side span steel upper chord extends into the side span concrete deck.

[0015] In one embodiment, the side span steel truss and / or the main span steel truss is a positive N truss; or,

[0016] The side span steel truss and / or the main span steel truss is an inverted N truss; or,

[0017] The side span steel trusses and / or the main span steel trusses are triangular trusses.

[0018] The second aspect of the embodiment of the present application also provides a cable-stayed bridge, including: a tower, a cable, a connecting pier and the above-mentioned steel-concrete composite beam; the main span truss beam and the side span truss beam are both connected to the tower through the cable, and a connecting pier is provided at the bottom of each side span truss beam.

[0019] In one embodiment, the cable-stayed bridge further includes auxiliary piers, and at least one auxiliary pier is provided at the bottom of each side span truss beam for connection.

[0020] In one embodiment, the side span concrete lower parallel connection includes a plurality of concrete lower parallel connection units, and the plurality of concrete lower parallel connection units are spaced apart along the longitudinal direction of the bridge. The side span concrete lower parallel connection includes a plurality of concrete lower parallel connection units, and the plurality of concrete lower parallel connection units are spaced apart along the longitudinal direction of the bridge, and at least one of the concrete lower parallel connection units is arranged on the top of the auxiliary pier located at the bottom of the side span truss beam.

[0021] In one embodiment, the number of the concrete lower parallel connection unit provided on the top of the auxiliary pier is one, and the length of the one concrete lower parallel connection unit along the longitudinal direction of the bridge is not less than twice the length of the internode of the side span truss beam.

[0022] In one embodiment, the cable-stayed bridge also includes a secondary side span truss beam arranged between the main span truss beam and the side span truss beam, the secondary side span truss beam includes a secondary side span concrete bridge deck, two secondary side span steel trusses and a secondary side span lower parallel connection, the two secondary side span steel trusses are symmetrically arranged along the transverse direction of the bridge, the secondary side span concrete bridge deck is connected to the top of the two secondary side span steel trusses, the secondary side span steel lower parallel connection is connected to the bottom of the two secondary side span steel trusses, and the secondary side span lower parallel connection is a secondary side span steel lower parallel connection or a secondary side span concrete lower parallel connection.

[0023] The present invention provides a steel-concrete composite beam and a cable-stayed bridge. The steel-concrete composite beam is composed of a main span truss beam and a side span truss beam. The main span truss beam is composed of a main span concrete deck, two main span steel trusses, and a main span steel lower tie. The side span truss beam is composed of a side span concrete deck, two side span steel trusses, and a side span concrete lower tie. In other words, the lower tie of the main span truss beam is a steel structure, while the lower tie of the side span truss beam is a concrete structure. In terms of structural performance, a cable-stayed bridge using the steel-concrete composite beam has the main span concrete deck of the main span truss beam bearing axial pressure, while the main span steel lower tie reduces its own weight to bear bending moment and enhance the spanning capacity of the cable-stayed bridge. This can improve the stiffness of the main span truss beam and enhance driving comfort. At the same time, due to the large deadweight of the concrete structure, the side span truss beam acts as a weight and anchor, saving steel. Therefore, the steel-concrete composite beam and cable-stayed bridge of the present invention enhance the spanning capacity of the cable-stayed bridge and improve the economic efficiency of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a cable-stayed bridge according to an embodiment of the present application;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the main span steel lower flat joint, side span concrete lower flat joint and secondary side span lower flat joint of the steel-concrete composite beam shown in FIG;

[0026] Figure 3 for Figure 2 A partial enlarged view of structure A shown in

[0027] Figure 4 for Figure 1 Schematic diagram of a cross section of the main span truss girder at the hanging point shown in FIG;

[0028] Figure 5 for Figure 1 Schematic diagram of a cross section of the main span truss girder at a non-hanging point shown in FIG;

[0029] Figure 6 for Figure 1 Schematic diagram of a cross section of a side span truss girder at a hanging point shown in ;

[0030] Figure 7 for Figure 1 Schematic diagram of the cross section of the side span truss beam at the non-hanging point shown in FIG.

[0031] Description of Reference Numerals

[0032] Steel-concrete composite beam 10; main span truss beam 11; main span concrete deck 111; main span steel truss 112; main span steel upper chord 1121; main span steel web member 1122; main span steel lower chord 1123; main span steel lower flat joint 113; main span steel cross beam 114; main span stiffener 115; side span truss beam 12; side span concrete deck 121; side span steel truss 122; side span steel upper chord 1 221; side span steel web member 1222; side span steel lower chord 1223; side span concrete lower parallel joint 123; concrete lower parallel joint unit 1231; side span steel cross beam 124; side span stiffening plate 125; secondary side span truss beam 13; secondary side span concrete bridge deck 131; secondary side span steel truss 132; secondary side span lower parallel joint 133; inclined cable 20; cable tower 30; connecting pier 40; auxiliary pier 50. DETAILED DESCRIPTION

[0033] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0034] In this application, the "longitudinal bridge direction" orientation or position relationship is based on the attached Figure 1 As shown, the “cross-bridge” orientation or position relationship is based on the attached Figure 4 It should be understood that these directional terms are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0035] An embodiment of the present application provides a steel-concrete composite beam 10. Figures 1 to 7The steel-concrete composite beam 10 includes a main span truss beam 11 and a side span truss beam 12. The main span truss beam 11 includes a main span concrete deck 111, two main span steel trusses 112, and a main span steel lower flat joint 113. The two main span steel trusses 112 are symmetrically arranged along the transverse direction of the bridge. The main span concrete deck 111 is connected to the top of the two main span steel trusses 112, and the main span steel lower flat joint 113 is connected to the bottom of the two main span steel trusses 112. A side span truss beam 12 is set at at least one of the opposite ends of the main span truss beam 11 along the longitudinal bridge direction. The side span truss beam 12 includes a side span concrete bridge deck 121, two side span steel trusses 122 and a side span concrete lower parallel joint 123. The two side span steel trusses 122 are symmetrically arranged along the transverse bridge direction. The side span concrete bridge deck 121 is connected to the top of the side span steel truss 122, and the side span concrete lower parallel joint 123 is connected to the bottom of the side span steel truss 122.

[0036] Another embodiment of the present application provides a cable-stayed bridge. Figure 1 , including: a tower 30, a stay cable 20, a connecting pier 40 and a steel-concrete composite beam 10 provided in an embodiment; the main span truss beam 11 and the side span truss beam 12 are connected to the tower 30 through the stay cable 20, and a connecting pier 40 is provided at the bottom of each side span truss beam 12.

[0037] Specifically, the steel-concrete composite beam 10 of the embodiment of the present application is composed of a main span truss beam 11 and a side span truss beam 12, wherein the main span truss beam 11 is composed of a main span concrete bridge deck 111, two main span steel trusses 112 and a main span steel lower flat joint 113. In other words, the main span steel lower flat joint 113 of the main span truss beam 11 is a steel structure. In terms of structural performance, the main span concrete bridge deck 111 of the main span truss beam 11 can withstand axial pressure, and the main span steel trusses 112 and the main span steel lower flat joint 113 can not only reduce The side span truss beam 12 is composed of a side span concrete deck 121, two side span steel trusses 122, and a side span concrete lower flat joint 123. In other words, the side span concrete lower flat joint 123 of the side span truss beam 12 is a concrete structure. Due to the heavy weight of the concrete structure, the side span truss beam 12 can play a role in weighting and anchoring, and can save steel. The steel-concrete composite beam 10 of the embodiment of the present application enhances the spanning capacity of the cable-stayed bridge and improves the economic efficiency of the project.

[0038] In addition, in the relevant technology, in addition to steel trusses, steel box girders are also one of the commonly used structural forms for long-span cable-stayed bridges. Steel box girders have high tensile strength, low structural weight, high material utilization rate, can effectively exert the bearing capacity of steel plates, do not require concrete pouring, and have little impact on the environment. Using steel box girders as the main span of a cable-stayed bridge can give full play to the lightness of steel to enhance the spanning capacity, and arrange steel truss structures in the side spans and main spans. However, the main span steel box girder is large in size, has low rigidity, and has poor driving comfort. The side span steel structure is light in weight and cannot play a role in weight bearing. In addition, the amount of steel used in the bridge increases, the construction cost is high, and the subsequent maintenance costs are high.

[0039] The steel-concrete composite beam 10 and the cable-stayed bridge in the embodiment of the present application adopt a combined structure of a main span truss beam 11 and a side span truss beam 12, which has clear force and beautiful appearance. The main span truss beam 11 adopts a main span steel lower flat joint 113, and the beam body has light weight and strong spanning capacity. While meeting the bridge deck function for driving, it withstands the axial pressure generated by the horizontal component of the inclined cable 20 and the bending moment generated by the deflection of the beam body. The side span truss beam 12 adopts a side span concrete lower flat joint 123, which plays a role in weighing the bridge and anchoring the inclined cable 20, saves steel, has a small maintenance workload, and is more economical.

[0040] In one embodiment, please refer to Figure 6 The thickness of the concrete lower flat link 123 of the side span of the cable-stayed bridge can be adjusted according to the actual engineering span layout and force requirements.

[0041] In one embodiment, please refer to Figures 6 and 7 Each side span steel truss 122 includes a side span steel lower chord 1223 and multiple side span steel webs 1222. The bottom ends of the multiple side span steel webs 1222 are connected to the side span steel lower chord 1223. The side span concrete lower flat joint 123 is connected to the side span steel lower chord 1223 of the two side span steel trusses 122.

[0042] Specifically, the bottom ends of the side span steel lower chord 1223 and the side span steel web 1222 can be connected through an integral node plate, and the side span concrete lower flat joint 123 and the side span steel lower chord 1223 of the two side span steel trusses 122 can be connected through shear nails.

[0043] In one embodiment, please refer to Figures 4 and 5 Each main span steel truss 112 includes a main span steel lower chord 1123 and multiple main span steel web members 1122. The bottom ends of the multiple main span steel web members 1122 are connected to the main span steel lower chord 1123. The main span steel lower parallel joint 113 is connected to the main span steel lower chord 1123 of the two main span steel trusses 112.

[0044] Specifically, the bottom ends of the main span steel lower chord 1123 and the main span steel web 1122 may be connected via an integral node plate.

[0045] In one embodiment, please refer to Figure 6 The side span truss beam 12 also includes a plurality of side span steel cross beams 124 arranged between the two side span steel trusses 122. The plurality of side span steel cross beams 124 are arranged at intervals along the longitudinal direction of the bridge, and the opposite ends of each side span steel cross beam 124 along the transverse direction of the bridge are respectively connected to the side span steel web members 1222 of the corresponding side span truss beam 12. The side span concrete bridge deck 121 is laid on the plurality of side span steel cross beams 124. Thus, the integrity of the side span truss beam 12 can be improved and the structural stress performance can be enhanced.

[0046] Specifically, opposite ends of each side span steel beam 124 along the transverse direction of the bridge can be welded to the side span steel web members 1222 of the corresponding side span truss beam 12 respectively.

[0047] In one embodiment, please refer to Figure 4 The main span truss beam 11 also includes a plurality of main span steel cross beams 114 arranged between two main span steel trusses 112. The plurality of main span steel cross beams 114 are arranged at intervals along the longitudinal direction of the bridge, and the opposite ends of each main span steel cross beam 114 along the transverse direction of the bridge are respectively connected to the main span steel web members 1122 of the corresponding main span truss beam 11. The main span concrete bridge deck 111 is laid on the plurality of main span steel cross beams 114. Therefore, the integrity of the main span truss beam 11 can also be improved and the structural stress performance can be enhanced.

[0048] Specifically, the opposite ends of each main span steel beam 114 along the transverse direction of the bridge can be welded to the corresponding main span steel web member 1122 respectively.

[0049] In one embodiment, please refer to Figure 6 The side span truss beam 12 also includes a side span stiffening plate 125, which is arranged at the corner point formed between the interconnected side span steel beam 124 and the side span steel web member 1222, which can improve the stability of the side span truss beam 12.

[0050] Understandably, see Figure 4 The main span truss beam 11 also includes a main span stiffening plate 115, which is arranged at the corner point formed between the interconnected main span steel beam 114 and the main span steel web member 1122, which can improve the stability of the main span truss beam 11.

[0051] In one embodiment, please refer to Figure 6 Each side span steel truss 122 also includes a concrete filling layer, which is filled in the side span steel lower chord 1223, which can increase the deadweight of the side span steel truss 122 and strengthen the weight and anchoring effect of the side span steel truss 122.

[0052] In one embodiment, please refer to Figure 6Each side span steel truss 122 also includes a side span steel upper chord 1221, which is connected to the top ends of multiple side span steel webs 1222, and the side span concrete bridge deck 121 is connected to the side span steel upper chords 1221 of the two side span steel trusses 122.

[0053] Specifically, the top ends of the side span steel upper chord 1221 and the side span steel web 1222 may be connected via an integral gusset plate.

[0054] In one embodiment, please refer to Figure 6 At least a portion of the side span steel upper chord 1221 extends into the side span concrete deck 121. That is, a portion of the side span steel upper chord 1221 may extend into the side span concrete deck 121, or the entire side span steel upper chord 1221 may extend into the side span concrete deck 121. At least a portion of the side span steel upper chord 1221 extends into the side span concrete deck 121, which can enhance the integrity of the structure and improve its load-bearing performance.

[0055] It should be noted that, in some embodiments, the side span steel upper chord 1221 may not extend into the side span concrete bridge deck 121 .

[0056] In some embodiments, the side span steel upper chord 1221 may not be provided, that is, the top end of the side span steel web 1222 may be directly connected to the side span concrete bridge deck 121, thereby further saving steel consumption.

[0057] In one embodiment, please refer to Figure 4 Each main span steel truss 112 further includes a main span steel upper chord 1121, which is connected to the top ends of multiple main span steel web members 1122, and the main span concrete bridge deck 111 is connected to the main span steel upper chords 1121 of the two main span steel trusses 112.

[0058] Specifically, the top ends of the main span steel upper chord 1121 and the main span steel web 1122 may be connected via an integral node plate.

[0059] In one embodiment, please refer to Figure 4 At least a portion of the main span steel upper chord 1121 extends into the main span concrete deck 111. That is, a portion of the main span steel upper chord 1121 may extend into the main span concrete deck 111, or the entire main span steel upper chord 1121 may extend into the main span concrete deck 111. At least a portion of the main span steel upper chord 1121 extends into the main span concrete deck 111, which further strengthens the integrity of the structure and improves its load-bearing performance.

[0060] It should be noted that, in some embodiments, the main span steel upper chord 1121 may not extend into the main span concrete bridge deck 111 .

[0061] In some embodiments, the main span steel upper chord 1121 may not be provided, that is, the top end of the main span steel web 1122 may be directly connected to the main span concrete bridge deck 111, thereby further saving steel consumption.

[0062] In one embodiment, the side span steel trusses 122 and / or the main span steel trusses 112 are positive N trusses; that is, the side span steel trusses 122 may be positive N trusses, the main span steel trusses 112 may be positive N trusses, or both the side span steel trusses 122 and the main span steel trusses 112 may be positive N trusses.

[0063] In one embodiment, the side span steel trusses 122 and / or the main span steel trusses 112 are inverted N trusses; that is, the side span steel trusses 122 may be inverted N trusses, the main span steel trusses 112 may be inverted N trusses, or both the side span steel trusses 122 and the main span steel trusses 112 may be inverted N trusses.

[0064] In one embodiment, the side span steel trusses 122 and / or the main span steel trusses 112 are triangular trusses. In other words, the side span steel trusses 122 may be triangular trusses, the main span steel trusses 112 may be triangular trusses, or both the side span steel trusses 122 and the main span steel trusses 112 may be triangular trusses.

[0065] It should be noted that the types of the side span steel trusses 122 and the main span steel trusses 112 are not limited to positive N trusses, reverse N trusses and triangular trusses, and the types can be determined according to actual project needs.

[0066] In one embodiment, please refer to Figure 1 The cable-stayed bridge further includes auxiliary piers 50. At least one auxiliary pier 50 is provided at the bottom of each side span truss beam 12, thereby improving the overall rigidity of the structure.

[0067] In one embodiment, please refer to Figures 1 to 2 The side span concrete lower parallel joint 123 includes a plurality of concrete lower parallel joint units 1231, which are spaced apart along the longitudinal direction of the bridge, and at least one concrete lower parallel joint unit 1231 is arranged on the top of the auxiliary pier 50 located at the bottom of the side span truss beam 12.

[0068] In some implementations, the auxiliary pier 50 may not be provided.

[0069] In one embodiment, the range of spacing of the multiple concrete lower parallel joint units 1231 of the side span concrete lower parallel joint 123 along the longitudinal direction of the bridge can be determined based on the range of tensile force that the structural side span can withstand determined by actual engineering stress analysis, that is, the range of the tensile zone of the bridge side span.

[0070] In one embodiment, the multiple concrete lower parallel joint units 1231 of the side span concrete lower parallel joint 123 are spaced apart in the longitudinal direction of the bridge in a range not less than the tensile zone of the side span of the bridge, which can reduce the tensile stress of the side span concrete bridge deck 121, while playing a role in weighing down the bridge and anchoring the inclined cables 20, and improving the vertical stiffness of the main span steel truss 112.

[0071] In one embodiment, the multiple concrete lower parallel joint units 1231 in the tension zone of the side span concrete lower parallel joint 123 may not be equipped with longitudinal prestressed tendons and do not participate in longitudinal force, which can reduce the number of prestressed tendons used and improve economy.

[0072] In one embodiment, please refer to Figure 3 The number of the concrete lower parallel connection unit 1231 arranged on the top of the auxiliary pier 50 is one, and the length d of the concrete lower parallel connection unit is not less than twice the length of the internode of the side span truss beam 12.

[0073] According to common knowledge, the place where the rods intersect is called a node, and the length between two nodes in the longitudinal direction of the bridge is called the span length. The node in this application refers to the node where the side span steel web member 1222 and the side span steel lower chord member 1223 intersect.

[0074] It should be noted that in actual engineering, the top of the auxiliary pier 50 is generally facing the node of a side span truss beam 12, and the range of negative bending moment borne by the top beam of the auxiliary pier 50 (i.e., the range of the negative bending moment zone) determined according to the actual engineering force analysis is generally not less than the length between the nodes on both sides of the top of the auxiliary pier 50. Therefore, the length d of the concrete lower parallel connection unit 1231 at the top of the auxiliary pier 50 should include the length between the nodes on both sides of the pier top. This can greatly reduce the tensile stress of the concrete bridge deck located at the top of the auxiliary pier 50, solve the problem of the concrete bridge deck being tensile due to negative bending moment, and improve the mechanical properties of the structure.

[0075] In one embodiment, the lower concrete parallel connection unit 1231 in the negative bending moment area at the top of the auxiliary pier 50 may not be provided with longitudinal prestressed steel bars, and is a biased compression member, which can save the amount of steel bars.

[0076] In one embodiment, please refer to Figure 1The cable-stayed bridge also includes a secondary side span truss beam 13 arranged between the main span truss beam 11 and the side span truss beam 12. The secondary side span truss beam 13 includes a secondary side span concrete bridge deck 131, two secondary side span steel trusses 132 and a secondary side span lower parallel joint 133. The two secondary side span steel trusses 132 are symmetrically arranged along the transverse direction of the bridge. The secondary side span concrete bridge deck 131 is connected to the top of the two secondary side span steel trusses 132, and the secondary side span lower parallel joint 133 is connected to the bottom of the two secondary side span steel trusses 132. The secondary side span lower parallel joint 133 is a secondary side span steel lower parallel joint.

[0077] It can be understood that the secondary side span truss girder 13 maintains the same structure as the main span truss girder 11 .

[0078] In one embodiment, the secondary side span lower parallel joint 133 is a secondary side span concrete lower parallel joint, and the secondary side span truss beam 13 and the side span truss beam 12 maintain the same structure.

[0079] It should be noted that the type of the secondary side span truss beam 13 can be determined according to the actual needs of the project and the stress conditions of the cable-stayed bridge.

[0080] In one embodiment, the thickness and width of the side span concrete deck 121 of the cable-stayed bridge, and / or the secondary side span concrete deck 131, and / or the main span concrete deck 111 can be adjusted according to actual engineering stress characteristics.

[0081] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A steel-concrete composite beam, characterized in that: include: A main span truss girder, the main span truss girder comprising a main span concrete deck, two main span steel trusses, and a main span steel lower flat joint, the two main span steel trusses being symmetrically arranged along the transverse direction of the bridge, the main span concrete deck being connected to the tops of the two main span steel trusses, and the main span steel lower flat joint being connected to the bottoms of the two main span steel trusses; A side span truss girder, wherein the side span truss girder is provided at at least one of the opposite ends of the main span truss girder along the longitudinal bridge direction, the side span truss girder comprising a side span concrete deck, two side span steel trusses, and a side span concrete lower flat joint, the two side span steel trusses being symmetrically arranged along the transverse bridge direction, the side span concrete deck being connected to the top of the side span steel trusses, and the side span concrete lower flat joint being connected to the bottom of the side span steel trusses; The side span concrete lower parallel connection includes a plurality of concrete lower parallel connection units, and the plurality of concrete lower parallel connection units are spaced apart along the longitudinal direction of the bridge.

2. The steel-concrete composite beam according to claim 1, characterized in that: Each side span steel truss includes a side span steel lower chord and multiple side span steel webs. The bottom ends of the multiple side span steel webs are connected to the side span steel lower chord, and the side span concrete lower flat joint is connected to the side span steel lower chord of the two side span steel trusses.

3. The steel-concrete composite beam according to claim 2, characterized in that: The side span truss beam also includes a plurality of side span steel cross beams arranged between the two side span steel trusses. The plurality of side span steel cross beams are arranged at intervals along the longitudinal direction of the bridge, and the opposite ends of each side span steel cross beam along the transverse direction of the bridge are respectively connected to the side span steel web members of the corresponding side span truss beam, and the side span concrete bridge deck is laid on the plurality of side span steel cross beams.

4. The steel-concrete composite beam according to claim 3, characterized in that: The side span truss beam further includes a side span stiffening plate, which is arranged at a corner point formed between the side span steel beam and the side span steel web member connected to each other.

5. The steel-concrete composite beam according to claim 2, characterized in that: Each of the side span steel trusses further includes a concrete filling layer, and the concrete filling layer is filled in the side span steel lower chord.

6. The steel-concrete composite beam according to any one of claims 2 to 5, characterized in that: Each side span steel truss further includes a side span steel upper chord, which is connected to the top ends of the multiple side span steel webs, and the side span concrete bridge deck is connected to the side span steel upper chords of the two side span steel trusses.

7. The steel-concrete composite beam according to claim 6, characterized in that: At least a portion of the side span steel upper chord extends into the side span concrete bridge deck.

8. The steel-concrete composite beam according to claim 1, characterized in that: The side span steel truss and / or the main span steel truss is a positive N truss; or, The side span steel truss and / or the main span steel truss is an inverted N truss; or, The side span steel trusses and / or the main span steel trusses are triangular trusses.

9. A cable-stayed bridge, characterized in that: include: A cable tower, a stay cable, a connecting pier and a steel-concrete composite beam as described in any one of claims 1 to 8; the main span truss beam and the side span truss beam are connected to the cable tower through the stay cable, and a connecting pier is provided at the bottom of each side span truss beam.

10. The cable-stayed bridge according to claim 9, characterized in that: The cable-stayed bridge further comprises auxiliary piers, and at least one auxiliary pier is provided at the bottom of each side span truss beam for connection.

11. The cable-stayed bridge according to claim 10, characterized in that: At least one of the concrete lower parallel connection units is arranged on the top of the auxiliary pier located at the bottom of the side span truss beam.

12. The cable-stayed bridge according to claim 11, characterized in that: The number of the concrete lower parallel connection unit arranged on the top of the auxiliary pier is one, and the length of the one concrete lower parallel connection unit along the longitudinal direction of the bridge is not less than twice the length of the internode of the side span truss beam.

13. The cable-stayed bridge according to claim 9, characterized in that: The cable-stayed bridge also includes a secondary side span truss beam arranged between the main span truss beam and the side span truss beam, the secondary side span truss beam includes a secondary side span concrete bridge deck, two secondary side span steel trusses and a secondary side span lower parallel connection, the two secondary side span steel trusses are symmetrically arranged along the transverse direction of the bridge, the secondary side span concrete bridge deck is connected to the top of the two secondary side span steel trusses, the secondary side span steel lower parallel connection is connected to the bottom of the two secondary side span steel trusses, and the secondary side span lower parallel connection is a secondary side span steel lower parallel connection or a secondary side span concrete lower parallel connection.

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