Detachable steel-concrete composite beam bridge structure

Abstract

The invention relates to a detachable steel-concrete composite beam bridge structure which comprises a prefabricated composite bridge deck slab comprising a corrugated steel plate and ultra-high performance concrete; the shearing force connecting piece comprises a trapezoid shearing force connecting piece body and a perforated steel plate connecting piece body, a web of the trapezoid shearing force connecting piece body is provided with double-layer open holes, and the perforated steel plate connecting piece body is provided with single-layer open holes. The deformed steel bars are provided with two layers, the upper layer continuously penetrates through the perforated steel plates and the holes in the web plates of the trapezoidal connecting pieces in the transverse bridge direction, and the lower layer only penetrates through the holes in the web plates of the trapezoidal shearing force connecting pieces; the steel main beam is arranged below the corrugated section of the corrugated steel plate; the transverse support is located between the steel main beam and the prefabricated combined bridge deck slab; the trapezoid shear connecting pieces and the corrugated steel plates are connected through high-strength bolts, and the steel main beams, the corrugated steel plates and the cross braces are connected through high-strength bolts. According to the structure, the prefabricated combined bridge deck is connected with the steel main beam through the high-strength bolts, the steel-concrete combined beam bridge structure capable of being completely detached is formed, and meanwhile the integrity and durability of the steel-concrete combined beam bridge structure are guaranteed.

Description

Technical Field

[0001] The present application relates to the field of bridge engineering, and in particular to a detachable steel-concrete composite beam bridge structure. Background Art

[0002] Composite beam bridges include steel-concrete composite beam bridges. Steel-concrete composite beam bridges can give full play to the structural advantages of steel beams under tension and concrete bridge decks under compression. They are widely used in the field of bridge engineering. A number of large-span steel-concrete composite beam bridges represented by Yangpu Bridge and Xiazhang Cross-sea Bridge have been built. With the development of prefabricated and intelligent construction technology, steel-concrete composite beam bridges have begun to develop into small and medium-span bridges. In recent years, the promotion and application of high-performance steel and ultra-high-strength concrete have made it possible to lightweight and highly strengthen steel-concrete composite beam bridges, further promoting the engineering application of steel-concrete composite beam bridges.

[0003] The construction of steel-concrete composite beam bridges first adopts the overall hoisting or segmental assembly of steel main beams. After they are in place, the formwork is set up and the concrete bridge deck is poured. During the construction process, under the construction loads of cast-in-place concrete and pavement layers, the web in the negative moment area is prone to local buckling due to excessive compressive stress, while the positive moment area will experience overall lateral torsion, which seriously affects the overall stability of the beam. In order to resist compressive stress, shear connectors are buried in the composite beam bridge deck.

[0004] At present, most steel-concrete composite beam bridges use welded studs as trapezoidal shear connectors. Under the influence of vehicle loads, environmental factors, etc., fatigue fracture damage is easily caused at the weld position, resulting in structural damage to the steel-concrete composite beam bridge after long-term use. The treatment methods for structural damage of beam bridges include:

[0005] First, the damaged position is often at the weld position, which makes it difficult to repair and reinforce in the later stage. At the same time, there is currently no better way to reinforce the weld. Generally, secondary welding is used for fixing, and the reinforcement effect is given priority.

[0006] Another option is to directly replace the beam bridge. However, the existing welded beam bridge needs to destroy the welding structure during the disassembly process, which can easily cause damage to the structure. The cost of completely disassembling the beam bridge is high, which leads to a high overall cost for replacing the beam bridge. Summary of the invention

[0007] In order to solve the above technical problems, this application provides the following technical solutions:

[0008] The present application provides a detachable steel-concrete composite beam bridge structure, comprising:

[0009] Precast composite bridge deck, which includes corrugated steel plates and ultra-high performance concrete;

[0010] The shear connector includes a trapezoidal shear connector and a perforated steel plate connector, wherein the web of the trapezoidal shear connector is provided with double-layer openings, and the perforated steel plate connector is a single-layer opening;

[0011] The deformed steel bars are provided with two layers, the upper layer continuously passes through the web openings of the trapezoidal shear connector and the perforated steel plate connector in the transverse direction, and the lower layer only passes through the web openings of the trapezoidal shear connector;

[0012] The steel main beam is arranged below the corrugated section of the corrugated steel plate;

[0013] Cross braces, which are located between the precast composite bridge deck and the steel main beam;

[0014] The trapezoidal shear connectors and the corrugated steel plates, as well as the steel main beams, corrugated steel plates and cross braces are all connected by high-strength bolts.

[0015] In one embodiment, the perforated steel plate connector is located in the straight section of the corrugated steel plate, and the trapezoidal shear connector is located in the corrugated section of the corrugated steel plate.

[0016] In one of the embodiments, holes are reserved in the prefabricated composite bridge deck at the locations where the trapezoidal shear connectors are arranged, and the holes are filled with mortar after the construction is completed.

[0017] In one embodiment, a double layer of openings is provided on the web of the trapezoidal shear connector, wherein the upper layer of openings is located at the same height as the perforated steel plate connector, and the lower layer of openings is located at half the height of the corrugated steel plate.

[0018] In one embodiment, the projection width of the trapezoidal shear connector on the corrugated steel plate is smaller than the width of the corrugated section.

[0019] In one embodiment, the cross braces are all I-section beams, the cross braces form a triangular structure, and are all connected by high-strength bolts.

[0020] In one embodiment, the trapezoidal shear connector is connected to the corrugated steel plate through an adhesive layer, and the perforated steel plate connector is connected to the corrugated steel plate by welding.

[0021] In one of the embodiments, high-strength bolts are provided at corresponding positions on the trapezoidal shear connector and the upper flange of the steel main beam, and the high-strength bolts are tightened below the upper flange of the steel main beam during construction.

[0022] In one embodiment, the high-strength bolts pass through the high-strength bolt holes of the trapezoidal shear connector and the adhesive layer to be connected to the upper flange of the steel main beam.

[0023] This application has at least the following beneficial effects:

[0024] In the present application, on the one hand, the structure adopts connectors to realize the connection between the trapezoidal shear connector and the corrugated steel plate. Compared with the welding method, the structural fatigue performance is superior, which ensures the integrity and durability of the detachable composite beam bridge structure.

[0025] On the other hand, especially for small and medium span bridges, the first connector and the second connector are easy to disassemble, and the prefabricated composite bridge deck, steel main beam and cross brace can be disassembled, so that the structure of the detachable composite beam bridge can be recycled. Since the detachable composite beam bridge is easy to disassemble, it is convenient for later maintenance. After disassembly, the structure can be recycled repeatedly, the structure is sustainable and cost-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a detachable steel-concrete composite beam bridge structure provided in one embodiment of the present application.

[0027] Figure 2 A schematic diagram of the steel main beam structure provided in one embodiment of the present application.

[0028] Figure 3 A schematic diagram of a cross brace provided in one embodiment of the present application.

[0029] Figure 4 A schematic diagram of the structure of a corrugated steel plate provided in one embodiment of the present application.

[0030] Figure 5 A schematic diagram of the structure of a trapezoidal shear connector provided in one embodiment of the present application.

[0031] Figure 6 A schematic diagram of the arrangement of a perforated steel plate connector on a corrugated steel plate provided in one embodiment of the present application.

[0032] Figure 7 A schematic diagram of a detachable composite beam bridge structure provided in another embodiment of the present application.

[0033] Figure 8 A schematic diagram of the arrangement of a perforated steel plate connector on a corrugated steel plate provided in another embodiment of the present application.

[0034] Reference numerals:

[0035] 1. Steel main beam; 11. Upper flange; 12. Lower flange; 13. Web plate; 14. Stiffening ribs;

[0036] 2. Horizontal bracing;

[0037] 3. Corrugated steel plate; 31. Straight section; 32. Corrugated section;

[0038] 4. Ultra-high performance concrete;

[0039] 5. Trapezoidal shear connector; 51. Web opening; 52. High-strength bolt hole;

[0040] 6. Perforated steel plate connectors;

[0041] 7. Deformed steel bars;

[0042] 8. High-strength bolts;

[0043] 9. Node plate. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that if the terms "length", "width", "thickness", "up", "down", "vertical", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, if the terms "first", "second", and "third" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" or "set on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0050] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0051] Reference Figure 1 , 2 As shown, in some embodiments of the present application, a detachable steel-concrete composite beam bridge structure is provided, including a prefabricated composite bridge deck, a steel main beam 1, and a cross brace 2. The steel main beam 1 is supported on the bottom of the prefabricated composite bridge deck, and the prefabricated composite bridge deck is supported by the steel main beam 1. The prefabricated composite bridge deck serves as a bridge deck. In order to ensure the structural strength of the beam bridge structure, a cross brace 2 is also connected between the prefabricated composite bridge deck and the steel main beam 1. The prefabricated composite bridge deck, the steel main beam 1, and the cross brace 2 are connected to each other in the detachable composite beam bridge structure through a detachable connecting piece as a connecting structure to form a closed triangle. Since the lengths of the sides of the triangle are determined, the area and shape of the triangle are completely determined, and the triangular structure is fixed.

[0052] The prefabricated composite bridge deck includes a corrugated steel plate 3, combined with Figure 4 As shown, the corrugated steel plate 3 has straight sections 31 and corrugated sections 32 connected alternately, so that the corrugated steel plate 3 presents a wavy structure, and the raised platform portion on the same side is the straight section 31, and the corresponding recessed platform portion is the corrugated section 32. During the construction of the beam bridge, after the beam bridge structure is built, concrete is poured on the corrugated steel plate 3 to form ultra-high performance concrete 4, and the ultra-high performance concrete 4 is attached to one side of the corrugated steel plate 3, so that the side where the ultra-high performance concrete 4 and the corrugated steel plate 3 are attached also presents a wavy structure.

[0053] In this solution, a composite bridge deck composed of a corrugated steel plate 3 and ultra-high performance concrete 4 is adopted. Under the same design load level, its deadweight is lighter than that of a traditional concrete bridge deck. In addition, since the corrugated steel plate 3 as a supporting structure of the ultra-high performance concrete 4 has better integrity and greater rigidity, the composite bridge deck formed by the corrugated steel plate and ultra-high performance concrete in this application has great strength. At the same time, the structure is connected by detachable connectors. Compared with welding, since welding involves first destroying the structure and then reassembling the destroyed structure, the fatigue performance of the structure at the weld is bound to be weaker than that of the undamaged structure. Therefore, under the influence of stress during long-term use, the structure at the weld is more prone to fatigue damage. In this application, the rigid connection structure of the detachable connector is used. Under the premise of ensuring the strength of the detachable connector, the structure will not be destroyed, which will make the fatigue performance of the structure superior, thereby ensuring the integrity and durability of the detachable composite beam bridge structure.

[0054] In addition, for small and medium span bridges, small and medium span bridges can be used as the main passage across rivers and lakes. However, the main function of more small and medium span bridges is temporary passage. The scope of use determines that small and medium span bridges need to meet the needs of quick assembly and disassembly while ensuring strength. In this solution, the detachable connector connecting the detachable composite beam bridge structure is easy to disassemble, and the structure of the detachable composite beam bridge is fully recyclable. The structure can be completely disassembled, which is convenient for later maintenance. After disassembly, the structure can be recycled repeatedly, and the structure is sustainable and cost-saving.

[0055] In some embodiments of the present application, the connecting member includes a first connecting member, and the first connecting member is used to connect the prefabricated composite bridge deck and the steel main beam 1. In this solution, the first connecting member is a high-strength bolt 8, and the steel main beam 1 is connected to the corrugated steel plate 3 by the high-strength bolt 8. The number of steel main beams 1 is at least two, and the two steel main beams 1 are symmetrically arranged, and the two steel main beams 1 are arranged near the edge of the corrugated steel plate 3.

[0056] In this solution, the steel main beam 1 includes an upper flange 11, a lower flange 12, a web 13, and a stiffening rib 14. The web 13 and the stiffening rib 14 are located between the upper flange 11 and the lower flange 12. Specifically, the stiffening rib 14 is arranged horizontally, and the web 13 and the stiffening rib 14 are connected to form a column structure. The stiffening rib 14 is used to improve the strength of the column structure formed by the web 13 and the stiffening rib 14. The upper flange 11 and the lower flange 12 are respectively arranged at both ends of the column structure. High-strength bolt holes are arranged on the upper flange 11. Correspondingly, through holes aligned with the high-strength bolt holes are arranged on the corrugated steel plate 3. The high-strength bolt holes on the upper flange 11 are aligned with the through holes on the corrugated steel plate 3, and the steel main beam 1 is connected to the prefabricated composite bridge deck by passing the high-strength bolt holes and the through holes through the high-strength bolts 8. The through holes are arranged on the straight section 31 close to the edge.

[0057] The connector also includes a second connector, which is used to connect the steel main beam 1 and the cross brace 2 or to connect the cross brace 2 and the prefabricated composite bridge deck. In this solution, the second connector is a node plate 9. In this solution, a node plate 9 is arranged at the connection between the lower flange 12 and the stiffening rib 14. A node plate 9 is also provided at the bottom of the corrugated steel plate 3, and the two node plates 9 are connected by a cross brace 2, and the node plate 9 and the cross brace 2 are also a detachable connection structure. Exemplarily, the node plate 9 has a hole position that is compatible with the cross section of the cross brace 2, the cross brace 2 is inserted into the node plate 9, and the steel main beam 1 is connected to the corrugated steel plate 3 by high-strength bolts 8, so that the steel main beam 1, the cross brace 2 and the corrugated steel plate 3 form a stable structure.

[0058] The steel main beam 1 is arranged near the edge of the corrugated steel plate 3, specifically: the steel main beam 1 is installed on the side opposite to the straight section 31 closest to the edge of the corrugated steel plate 3. Among them, the side opposite to the straight section 31 is the plane of the raised part seen from the other side on which the ultra-high performance concrete 4 is relatively attached to the corrugated steel plate 3. Since the detachable connecting part is a high-strength bolt 8, the steel main beam 1 is connected to the plane of the raised part, the high-strength bolt 8 is driven in from bottom to top, and the side opposite to the straight section 31 is the lowest horizontal plane of the prefabricated composite bridge deck, which reduces interference during the installation process of the high-strength bolt 8 and improves the installation efficiency.

[0059] Furthermore, the cross brace 2 includes a horizontal support rod and an oblique support rod. The horizontal support rod connects the node plate 9 at the connection between the lower flange 12 of the two steel main beams 1 and the stiffening rib 14. The oblique support rod connects the node plate 9 at the connection between the lower flange 12 of the two steel main beams 1 and the stiffening rib 14 and the point plate 9 at the bottom of the corrugated steel plate 3. The node plate 9 at the bottom of the corrugated steel plate 3 connects the two oblique support rods, so that the corrugated steel plate 3 and the two oblique support rods are in a K shape. In this solution, combined with Figure 3 As shown, the cross-section of the horizontal support rod and the diagonal support rod are both I-shaped. The weight of the horizontal support rod and the diagonal support rod is reduced while ensuring their strength. Since the horizontal support rod and the diagonal support rod intersect on the steel column 1 or the two diagonal support rods intersect on the corrugated steel plate 3, in order to avoid interference of the cross brace 2, a node plate 9 is set on the steel column 1 and the corrugated steel plate 3, so as to connect multiple cross braces 2 at the same position. The connection method between the cross brace 2 and the node plate 9 can be fixed by plugging or screwing.

[0060] Through the horizontal support rods and the oblique support rods, the two steel main beams 1 and the prefabricated composite bridge deck form three continuous triangles. Among them, the three continuous triangles are specifically two oblique support rods as the common side length of the three triangles. The support frame composed of the steel main beams 1 and the cross braces 2 under the prefabricated composite bridge deck is more stable.

[0061] In some embodiments of the present application, a trapezoidal shear connector 5, a perforated steel plate connector 6, and a deformed steel bar 7 are embedded in the ultra-high performance concrete 4. The trapezoidal shear connector 5 is located in the corrugated section 32 of the corrugated steel plate 3, and the trapezoidal shear connector 5 is connected to the corrugated section 32 of the corrugated steel plate 3 through an adhesive layer. Figure 5 As shown, the trapezoidal shear connector 5 is trapezoidal, and the trapezoidal shear connector 5 has two opposite waist plates, and the waist edge of the trapezoid is located on the waist plate. The trapezoidal shear connector 5 also has a horizontal section extending outward. In this scheme, a glue layer is provided between the horizontal section and the bottom surface of the straight section 31 to achieve the connection between the trapezoidal shear connector 5 and the corrugated steel plate 3. The waist plate is provided with two layers of web openings 51 arranged up and down in the height direction, and the bottom of the trapezoidal shear connector 5 is provided with high-strength bolt holes 52. The high-strength bolt holes 52 at the bottom of the trapezoidal shear connector 5 are aligned with the high-strength bolt holes on the upper flange 11. The trapezoidal shear connector 5 and the perforated steel plate connector 6 are embedded in the ultra-high performance concrete 4, specifically, the thickness of the ultra-high performance concrete 4 completely covers the trapezoidal shear connector 5 and the perforated steel plate connector 6. The prefabricated composite bridge deck reserves holes and grooves at the position where the trapezoidal shear connector 5 is arranged, and the holes and grooves are filled with mortar after the construction is completed.

[0062] The connection method of the trapezoidal shear connector 5, the corrugated steel plate 3, and the steel main beam 1 includes: first, injecting high-strength structural adhesive between the trapezoidal shear connector 5 and the corrugated steel plate 3, and adjusting the relative position of the trapezoidal shear connector 5 and the corrugated steel plate 3 so that the high-strength bolt hole 52 provided on the horizontal section is aligned with the high-strength bolt hole on the upper flange 11. After the trapezoidal shear connector 5 and the corrugated steel plate 3 are accurately positioned, the high-strength bolt 8 is inserted into the high-strength bolt hole on the upper flange 11 and the high-strength bolt 8 passes through the adhesive layer and the high-strength bolt hole 52 provided on the horizontal section. Finally, the adhesive layer is solidified, thereby connecting the trapezoidal shear connector 5, the corrugated steel plate 3, and the steel main beam 1 to each other. In this solution, the trapezoidal shear connector 5 and the corrugated steel plate 3 are fixed by high-strength structural adhesive and high-strength bolts 8. Compared with the existing weld connection, the structural fatigue performance is superior, thereby ensuring the integrity and durability of the composite beam bridge structure.

[0063] In a specific embodiment, reference Figure 6As shown, the perforated steel plate connector 6 is arranged in the straight section 31 and the wavy section 32 between the steel main beams 1, and the perforated steel plate connector 6 located in the wavy section 32 is provided with two layers of openings arranged up and down in the height direction, and the perforated steel plate connector 6 located on the straight section 31 is provided with a single layer of openings. Specifically, the perforated steel plate connector 6 located in the straight section 31 and the wavy section 32 are aligned in the height direction, so that the height of the perforated steel plate connector 6 located in the wavy section 32 is greater than the height of the perforated steel plate connector 6 located on the straight section 31. The openings of the layer of the perforated steel plate connector 6 located in the wavy section 32 in the height direction are higher than those of the straight section 31, so that the openings of the layer of the perforated steel plate connector 6 located in the wavy section 32 in the height direction are aligned with the openings of the perforated steel plate connector 6 located in the straight section 31, and the openings of the layer of the perforated steel plate connector 6 located in the wavy section 32 in the height direction are also aligned with the openings 51 of the upper web of the waist plate.

[0064] The deformed steel bars 7 are arranged transversely to the bridge, arranged in sections in the wavy section 32, and arranged transversely through the straight section 31. In this solution, the deformed steel bars 7 pass through the upper web openings 51 of the waist plate, the openings of the perforated steel plate connector 6 located in the straight section 31, and the upper openings of the perforated steel plate connector 6 located in the wavy section 32. Another part of the deformed steel bars 7 is segmented steel bars, which are located in the wavy section 32 and pass through the lower web openings 51 of the waist plate or the lower openings of the perforated steel plate connector 6 located in the wavy section 32. The strength of the ultra-high performance concrete 4 is strengthened by the deformed steel bars 7.

[0065] In another specific embodiment, referring to Figure 7 , 8 As shown, the perforated steel plate connector 6 is arranged on the wavy section 32, and the trapezoidal shear connector 5 is located in the wavy section 32. In this embodiment, the deformed steel bar 7 passes through the upper web opening 51 of the trapezoidal shear connector 5 and the opening of the perforated steel plate connector 6, and the segmented steel bar passes through the lower web opening 51 of the trapezoidal shear connector 5.

[0066] In this embodiment, the trapezoidal shear connector 5 is connected to the corrugated steel plate 3 by a glue layer. It is understandable that the trapezoidal shear connector 5 and the corrugated steel plate 3 can also be reinforced by high-strength bolts 8 to make the connection between the trapezoidal shear connector 5 and the corrugated steel plate 3 more stable.

[0067] Furthermore, the projection width of the trapezoidal shear connector 5 on the corrugated steel plate 3 is smaller than the width of the corrugated section 32. That is, there is a gap between the waist surface of the trapezoidal shear connector 5 and the side wall of the corrugated section 32, and part of the ultra-high performance concrete 6 can fill the waist surface of the trapezoidal shear connector 5 and the side wall of the corrugated section 32. The ultra-high performance concrete 6 can be pressed on the corrugated steel plate 3 to reduce the pressure of the ultra-high performance concrete 6 on the trapezoidal shear connector 5, so as to ensure the durability of the trapezoidal shear connector 5.

[0068] Furthermore, the deformed steel bar 7 is clearance-matched with the trapezoidal shear connector 5 and the perforated steel plate connector 6. Specifically, the diameter of the opening on the trapezoidal shear connector 5 and the perforated steel plate connector 6 is 3 to 5 times the diameter of the deformed steel bar 7. The trapezoidal shear connector 5 and the perforated steel plate connector 6 are used to support the deformed steel bar 7 to limit the position of the deformed steel bar 7. At the same time, in order to simplify the installation, the opening on the trapezoidal shear connector 5 and the perforated steel plate connector 6 is larger than the diameter of the deformed steel bar 7, so that the deformed steel bar 7 can be easily inserted into the opening on the trapezoidal shear connector 5 and the perforated steel plate connector 6.

[0069] The above embodiments are used to further illustrate the present application, but the present application is not limited to these specific implementations. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be understood to be within the scope of protection of the present application.

Claims

1. A detachable steel-concrete composite beam bridge structure, characterized in that: include: A prefabricated composite bridge deck, the prefabricated composite bridge deck comprising a corrugated steel plate (3) and ultra-high performance concrete (4); The shear connector comprises a trapezoidal shear connector (5) and a perforated steel plate connector (6), wherein the web of the trapezoidal shear connector (5) is provided with double-layered openings, and the perforated steel plate connector (6) is a single-layered opening; The deformed steel bars (7) are provided with two layers, the upper layer continuously passes through the web openings of the trapezoidal shear connector (5) and the perforated steel plate connector (6) in the transverse direction, and the lower layer only passes through the web openings of the trapezoidal shear connector (5); A steel main beam (1) is arranged below the corrugated section of the corrugated steel plate (3); A cross brace (2), wherein the cross brace (2) is located between the prefabricated composite bridge deck and the steel main beam (1); The trapezoidal shear connector (5) and the corrugated steel plate (3), and the steel main beam (1), the corrugated steel plate (3) and the cross brace (2) are all connected by high-strength bolts.

2. The detachable steel-concrete composite beam bridge structure according to claim 1, characterized in that: The perforated steel plate connecting member (6) is located in the straight section (31) of the corrugated steel plate, and the trapezoidal shear connecting member (5) is located in the corrugated section (32) of the corrugated steel plate.

3. The detachable steel-concrete composite beam bridge structure according to claim 1, characterized in that: The prefabricated composite bridge deck has holes and grooves reserved at the locations where the trapezoidal shear connectors (5) are arranged, and the holes and grooves are filled with mortar after the construction is completed.

4. The detachable steel-concrete composite beam bridge structure according to claim 1, characterized in that: The web of the trapezoidal shear connector (5) is provided with double-layer openings, wherein the upper layer of openings and the perforated steel plate connector (6) are located at the same height, and the lower layer of openings are located at half the height of the corrugated steel plate.

5. The detachable steel-concrete composite beam bridge structure according to claim 1, characterized in that: The projection width of the trapezoidal shear connector (5) on the corrugated steel plate (3) is smaller than the width of the corrugated section (32).

6. The detachable steel-concrete composite beam bridge structure according to claim 1, characterized in that: The cross braces (2) are all I-shaped cross-section beams, the cross braces (2) form a triangular structure, and are all connected by high-strength bolts.

7. A detachable steel-concrete composite beam bridge structure according to any one of claims 1 to 4, characterized in that: The trapezoidal shear connector (5) is connected to the corrugated steel plate (3) via an adhesive layer, and the perforated steel plate connector (6) is connected to the corrugated steel plate (3) by welding.

8. A detachable steel-concrete composite beam bridge structure according to any one of claims 1 to 5, characterized in that: The trapezoidal shear connector (5) and the upper flange (11) of the steel main beam are provided with high-strength bolts at corresponding positions, and the high-strength bolts (8) are screwed in below the upper flange (11) of the steel main beam during construction.

9. The detachable steel-concrete composite beam bridge structure according to claim 8, characterized in that: The high-strength bolts (8) pass through the high-strength bolt holes of the trapezoidal shear connector (5) and the adhesive layer to be connected to the upper flange (11) of the steel main beam.

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