Wet joint steel bar connecting structure of steel-concrete composite beam bridge and connecting method of wet joint steel bar connecting structure

Abstract

The invention belongs to the technical field of bridge engineering, and particularly relates to a steel-concrete composite beam bridge wet joint steel bar connecting structure and a connecting method thereof. A wet joint is formed between every two adjacent prefabricated bridge deck slabs at the top of the steel beam at intervals; a plurality of connecting assemblies; each connecting assembly comprises a reinforcing steel bar inlaying section; two sleeves; and two embedded steel bars. The reinforcing steel bar inlaying section does not need to rotate during connection, so that axial deviation can be compensated through slight bending of the reinforcing steel bar inlaying section, the adjustable amount of the reinforcing steel bar inlaying section is improved, the relative position precision requirement between two adjacent prefabricated bridge deck slabs is reduced, the construction difficulty is reduced, the connection precision is guaranteed, and environmental pollution is avoided; and the length of the reinforcing steel bar inlaying section does not need to be larger than the distance between the two embedded reinforcing steel bars, so that the two ends can be constructed at the same time during bridge site construction, the construction efficiency is improved, and the site construction progress requirement can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a wet joint steel bar connection structure of a steel-concrete composite beam bridge and a connection method thereof. Background Art

[0002] Steel-concrete composite beam bridges are occupying an increasingly large share in the field of bridge construction due to their light structure, high strength, simple construction, easy industrialization and productization, superior force bearing, and recyclable steel.

[0003] In traditional steel-concrete composite beam bridge structures, there are usually two types of steel bar connection at wet joints: one is to use steel bar lap welding for connection. This method has a rough installation process and low standardization. Steel bar welding will also pollute the environment and cannot meet the requirements of the "dual carbon strategy" proposed by the country; the other is to use sleeve connection, in which the sleeve is pre-buried in the prefabricated bridge deck in advance. During construction, after one bridge deck is positioned, one end of the steel bar embedded section is screwed into the sleeve on that side. After the other adjacent bridge deck is positioned, the steel bar embedded section is screwed out for a part of its length and then screwed into the other sleeve corresponding to it. The advantage of this method is that it can improve standardization and solve the pollution problem caused by steel bar lap welding. However, since the position of the sleeve is fixed with the position of the prefabricated bridge deck, the relative position accuracy of the two adjacent bridge decks is required to be very high when the embedded section steel bars are connected. The adjustable amount of the steel bar embedded section itself is very small (less than or equal to 1.0 mm) when connected, and the bridge site can only be constructed step by step from one end to the other. The construction efficiency is very low and cannot meet the on-site construction progress requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a wet joint steel bar connection structure and a connection method for a steel-concrete composite beam bridge, which solves the technical problem that the prior art cannot ensure connection accuracy with a certain adjustable amount and avoid environmental pollution, while also improving construction efficiency.

[0005] In a first aspect, the present invention discloses a steel-concrete composite beam bridge wet joint steel bar connection structure, comprising: Steel beams; Prefabricated bridge decks are overlapped on the upper surface of the steel beam, and a wet joint is formed between two adjacent prefabricated bridge decks at the top of the steel beam; A plurality of connection components are arranged at intervals and connect two adjacent prefabricated bridge panels; Wherein, each of the connection components comprises: A steel bar patching section is located in the wet joint; Two sleeves are respectively threadedly sleeved on the two ends of the steel bar embedding section; Two embedded steel bars are respectively embedded in two adjacent prefabricated bridge panels, and one end of each of the two steel bars extends from the edge of the prefabricated bridge panels into the wet joint and is threadedly sleeved with one of the sleeves.

[0006] The present application makes it unnecessary for the steel bar embedded section to rotate during connection, so that the axial deviation can be compensated by slight bending of itself, thereby increasing its own adjustable amount, reducing the relative position accuracy requirements between two adjacent prefabricated bridge panels, reducing the construction difficulty, ensuring the connection accuracy, and avoiding environmental pollution; and the length of the steel bar embedded section does not need to be greater than the spacing between the two embedded steel bars, so that construction can be carried out at both ends simultaneously during the bridge construction, thereby improving the construction efficiency and meeting the on-site construction progress requirements.

[0007] On the basis of the above technical solution, the solution of this application can also be improved as follows: Preferably, the distance between two adjacent prefabricated bridge panels is L; The protruding end of the embedded steel bar is provided with an external thread, and the thread length is L1; The overall length of the steel bar embedding section is L2; Both ends of the steel bar patching section are provided with external threads, and the thread length is L3; The sleeve is provided with a full-length internal thread, and the thread length is L4; The gap between the embedded steel bars and the steel bar patching section when connected is δ; Among them, L2=L-2*(L1+δ), L3=2*L1, L4=2*L1+δ; adopting this solution ensures that the connection components can be correctly installed and effectively connected, and guarantees the stability of the connection.

[0008] Preferably, the thread direction and pitch of the external threads at both ends of the steel bar embedding section are respectively consistent with the external threads of the adjacent protruding ends of the embedded steel bars; by adopting this solution, it is ensured that the sleeve can simultaneously connect the steel bar embedding section and the embedded steel bars, thereby ensuring a smooth and firm connection, and having the same mechanical properties and reliability, and improving strength and stability, and being easy to install and disassemble.

[0009] Preferably, δ satisfies: δ≤5.0 mm; adopting this solution limits the length of the sleeve and saves material costs.

[0010] Preferably, the external threads at both ends of the steel bar patching section have opposite thread directions and the same pitch; adopting this solution, it is convenient to screw out the sleeve at both ends at the same time, so that the threads at both ends can offset the tightening force of each other, which is convenient for construction personnel to operate, and helps prevent the steel bar patching section from loosening or falling off when under stress, thereby improving the stability and safety of the connection.

[0011] In a second aspect, the present invention discloses a method for connecting wet joint steel bars of a steel-concrete composite beam bridge, using any of the above-mentioned steel-concrete composite beam bridge wet joint steel bar connection structures, comprising the following steps: S1: Install the steel beam, overlap two prefabricated bridge panels on the upper surface of the steel beam, and then adjust the position of the prefabricated bridge panels to meet the accuracy requirements before positioning; S2: Measure the distance between two adjacent prefabricated bridge panels, count and number them, and then produce and process the corresponding steel bar embedding sections according to the measurement results; S3: Screw the pre-processed sleeves into both ends of the steel bar patching section; S4: Place the steel bar patching sections at the steel bar docking positions in the wet joints according to the numbers, then screw out the sleeves at both ends of the steel bar patching sections to make initial connections with the embedded steel bars, and then perform the tightening operation until the sleeves are tightened to the threaded ends of the embedded steel bars.

[0012] The method of the present application has the advantages of firm and reliable connection, strong adjustability, high construction efficiency, convenient quality control and high safety, and has broad application prospects and promotion value in bridge construction.

[0013] Preferably, the accuracy requirement is that the axial deviation between the corresponding two embedded steel bars is ≤5.0mm; adopting this solution can ensure both precise docking and the adjustable amount of the steel bar embedding sections and the embedded steel bars in the two relative positions, reduce the bending deformation of the steel bar embedding sections, help reduce stress concentration at the connection, improve the stability and overall strength of the connection, and thus more effectively transmit the force, thereby enhancing the durability and safety of the bridge.

[0014] Preferably, the step of producing and processing corresponding steel bar patching sections according to the measurement results includes: L2=L-2*(L1+δ) Wherein, L represents the distance between two adjacent prefabricated bridge panels; L1 represents the thread length of the protruding end of the embedded steel bar; L2 represents the overall length of the steel bar embedded section; δ represents the gap between the embedded steel bar and the steel bar embedded section when connected; the adoption of this scheme ensures that the produced and processed steel bar embedded section can be fully adapted, ensures the firmness and reliability of the connection, ensures the consistency of the structural strength, and improves the overall stability and safety of the bridge.

[0015] Preferably, when the pre-processed sleeve is screwed into both ends of the steel bar patching section, the sleeve should be screwed in completely; adopting this solution can avoid interference with the placement of the steel bar patching section in the docking position, and facilitate the operating personnel to observe and adjust the gap between the embedded steel bars and the steel bar patching section.

[0016] Preferably, before screwing out the sleeves at both ends of the steel bar embedded section and initially connecting with the embedded steel bar, the method further comprises: The gap between the steel bar embedding section and the embedded steel bars on both sides is adjusted to be evenly divided; the adoption of this scheme optimizes the structural stress and ensures that the connection between the steel bar embedding section and the embedded steel bars on both sides is more uniform and stable, thereby reducing stress concentration at the connection, improving the durability and safety of the connection, avoiding connection failure caused by local overload, and improving the overall bearing capacity and stability of the bridge structure, which can better resist deformation and damage.

[0017] Through the above technical solution, the present invention achieves the following beneficial effects: 1. The steel bar embedded section of the present application does not need to rotate during connection, so it can compensate for the axial deviation by slightly bending itself, thereby increasing its own adjustable amount, reducing the relative position accuracy requirements between two adjacent prefabricated bridge panels, reducing construction difficulty, ensuring connection accuracy, and avoiding environmental pollution; and the length of the steel bar embedded section does not need to be greater than the spacing between the two embedded steel bars, so that both ends can be constructed simultaneously during bridge construction, thereby improving construction efficiency and meeting on-site construction progress requirements; 2. The method of the present application has the advantages of firm and reliable connection, strong adjustability, high construction efficiency, convenient quality control and high safety, and has broad application prospects and promotion value in bridge construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a wet joint steel bar connection structure of a steel-concrete composite beam bridge according to a specific embodiment of the present invention; Figure 2 for Figure 1 The structural schematic diagram of the precast bridge deck and embedded steel bars in the wet joint steel bar connection structure of the steel-concrete composite beam bridge shown; Figure 3 for Figure 1 The structural schematic diagram of the steel bar embedded section in the wet joint steel bar connection structure of the steel-concrete composite beam bridge shown; Figure 4 for Figure 1 The structural schematic diagram of the sleeve in the wet joint reinforcement connection structure of the steel-concrete composite beam bridge shown; Description of reference numerals: 1. Steel beam; 2. Prefabricated bridge deck; 3. Wet joint; 4. Connection assembly; 41. Rebar patching section; 42. Sleeve; 43. Embedded steel bars. DETAILED DESCRIPTION

[0020] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0021] First of all, it should be noted that in the following description, some directional words involved in order to clearly illustrate the technical solution of the present invention, such as the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., are all meanings that are inferred from the normal directions of the components in the wet joint steel bar connection structure of the steel-concrete composite beam bridge and its connection method. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0022] In this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Embodiment 1: like Figure 1 to Figure 4 As shown, an embodiment of the present application discloses a wet joint steel bar connection structure of a steel-concrete composite beam bridge, the specific structure of which includes: a steel beam 1, a prefabricated bridge deck 2, a wet joint 3 and a plurality of connection components 4.

[0025] The steel beam 1 is in an I-shaped structure and serves as the main load-bearing structure of the bridge.

[0026] The precast bridge deck 2 is overlapped on the upper surface of the steel beam 1, and a wet joint 3 is formed between two adjacent precast bridge decks 2 at the top of the steel beam 1. The inner walls of the wet joint 3 have comb-tooth structures on both sides, which are used to increase the contact area between the cast-in-place concrete and the precast bridge deck 2, thereby improving the bonding tightness.

[0027] A plurality of connection components 4 are arranged at intervals from each other and connect two adjacent prefabricated bridge panels 2 .

[0028] Each connection assembly 4 includes: a steel bar embedding section 41, two sleeves 42 and two embedded steel bars 43, which are specifically configured as follows: The reinforcing steel bar embedded section 41 is located in the wet joint 3 and can compensate for the axial deviation by slightly bending; The two sleeves 42 are respectively threadedly sleeved on the two ends of the steel bar embedding section 41; Two embedded steel bars 43 are respectively embedded in two adjacent prefabricated bridge panels 2, and one end of each of the two embedded steel bars 43 extends from the edge of the prefabricated bridge panel 2 into the wet joint 3 and is threadedly sleeved with a sleeve 42.

[0029] It should be noted that, when the steel bar patching section 41 in the prior art is connected, it is necessary to screw the steel bar patching section 41 out of one sleeve 42 for a certain length and then screw it into the other corresponding sleeve 42 at the same time. Therefore, if the axial deviation between the two sleeves 42 is large, the steel bar patching section 41 will not be able to be threadedly connected with the sleeves 42 at both ends at the same time, thereby making the adjustable amount of the steel bar patching section 41 very small (less than or equal to 1.0 mm).

[0030] It should be noted that in order to ensure that the steel bar patching section 41 in the prior art can be connected to the sleeves 42 at both ends, its own length must be greater than the distance between the two sleeves 42. Therefore, during construction at the bridge site, it can only be constructed step by step from one end to the other. Otherwise, the steel bar patching section 41 will not be able to be installed, and its construction efficiency is very low, which cannot meet the on-site construction progress requirements.

[0031] Through the above-mentioned arrangement, the present invention makes it possible for the steel bar embedded section 41 to not rotate during connection, so that the axial deviation can be compensated by slight bending thereof, thereby increasing its own adjustable amount, reducing the relative position accuracy requirement between two adjacent prefabricated bridge panels 2, reducing the construction difficulty, ensuring the connection accuracy, and avoiding environmental pollution; and the length of the steel bar embedded section 41 does not need to be greater than the spacing between the two embedded steel bars 43, so that construction can be carried out simultaneously at both ends during bridge construction, thereby improving construction efficiency and meeting the on-site construction progress requirements.

[0032] In some embodiments, the spacing between two adjacent prefabricated bridge panels 2 is L; the protruding end of the embedded steel bar 43 is provided with an external thread, and the thread length is L1; the overall length of the steel bar embedded section 41 is L2; ​​both ends of the steel bar embedded section 41 are provided with external threads, and the thread length is L3; the sleeve 42 is provided with a full-length internal thread, and the thread length is L4; the gap between the embedded steel bar 43 and the steel bar embedded section 41 when connected is δ; wherein, L2=L-2*(L1+δ), L3=2*L1, L4=2*L1+δ.

[0033] By limiting the lengths of the reinforcing steel bar embedding section 41 , the sleeve 42 and the embedded reinforcing steel bar 43 , it is ensured that the connection assembly 4 can be correctly installed and effectively connected, and the stability of the connection is guaranteed.

[0034] Based on the above embodiment, the thread direction and pitch of the external threads at both ends of the reinforcing steel bar embedded section 41 are respectively consistent with the external threads at the protruding ends of the adjacent embedded steel bars 43 .

[0035] Through the above arrangement, the sleeve 42 can be connected to the steel bar embedding section 41 and the embedded steel bar 43 at the same time, thereby ensuring a smooth and firm connection, having the same mechanical properties and reliability, and improving strength and stability, and being easy to install and disassemble.

[0036] Based on the above embodiment, δ satisfies: δ≤5.0 mm, which limits the length of the sleeve 42 and saves material cost.

[0037] Based on the above embodiment, the external threads at both ends of the steel bar patching section 41 have opposite thread directions and the same pitch. The design of opposite thread directions makes it easy to screw out the sleeve 42 at both ends at the same time, so that the threads at both ends can offset the tightening force of each other, thereby facilitating the operation of construction personnel. At the same time, it helps to prevent the steel bar patching section 41 from loosening or falling off when subjected to force, thereby improving the stability and safety of the connection.

[0038] Embodiment 2: The present application also discloses a method for connecting wet joint steel bars of a steel-concrete composite beam bridge, which uses the steel-concrete composite beam bridge wet joint steel bar connection structure of the first embodiment, and includes the following steps: S1: Install the steel beam 1, overlap two prefabricated bridge panels 2 on the upper surface of the steel beam 1, and then adjust the position of the prefabricated bridge panels 2 to meet the accuracy requirements and then position them.

[0039] Specifically, the steel beam 1 needs to be accurately installed according to the design requirements, and its position, height and levelness must meet the specifications.

[0040] S2: Measure the distance between two adjacent prefabricated bridge panels 2, count and number them, and then produce and process the corresponding steel bar embedding section 41 according to the measurement results.

[0041] Specifically, construction personnel can use measuring tools to measure the spacing to ensure measurement accuracy; and can produce and process the corresponding steel bar embedding section 41 in a special processing workshop, thereby reducing processing difficulty and improving processing efficiency.

[0042] S3: Screw the pre-processed sleeves 42 into the two ends of the steel bar embedding section 41.

[0043] S4: Place the steel bar patching section 41 at the steel bar docking position in the wet joint 3 according to the number, then screw out the sleeves 42 at both ends of the steel bar patching section 41, make an initial connection with the embedded steel bar 43, and then perform a tightening operation until the sleeve 42 is tightened to the threaded end of the embedded steel bar 43.

[0044] Specifically, the steel bar patching sections 41 are placed according to the numbers to ensure that each steel bar patching section 41 is placed in the correct position; construction personnel can use tools such as electric pipe clamps to apply torque to the sleeve 42 for tightening, thereby reducing labor intensity and improving installation efficiency; the sleeve 42 is tightened to the threaded end of the embedded steel bar 43 to ensure a firm connection and avoid loosening or falling off during subsequent construction.

[0045] The present invention has the following advantages through the above method: 1. The connection is firm and reliable. The sleeve 42 is tightened to the threaded end of the embedded steel bar 43 by tightening, which ensures the firmness and reliability of the connection, can effectively resist external forces, and prevent the connection from loosening or falling off; Second, it has strong adaptability. It is suitable for connecting prefabricated bridge panels 2 with different spacings. It only needs to produce and process the corresponding steel bar embedding section 41 according to the measurement results, and can flexibly adapt to various types of bridge construction requirements; 3. High construction efficiency. The pre-processing of the steel bar embedded segment 41 and the sleeve 42 and the on-site quick connection method greatly improve the construction efficiency, reduce the cumbersome processes such as on-site welding, and reduce the construction difficulty and cost. Fourth, it is convenient for quality control. Through strict measurement, processing and installation steps, it ensures the quality of steel bar connection at wet joints and improves the overall quality of the bridge; Fifth, it is highly safe. It avoids high-risk operations such as on-site welding, reduces the safety risks of construction workers, and reduces stress concentration at the connection by using the sleeve 42 for connection, thereby improving the seismic performance and safety of the bridge.

[0046] In some embodiments, the accuracy requirement is that the axial deviation between the corresponding two embedded steel bars 43 is ≤5.0mm, which can not only ensure precise docking, but also ensure the adjustable amount of the steel bar embedding section 41 and the embedded steel bar 43 at two relative positions, reduce the bending deformation of the steel bar embedding section 41, thereby helping to reduce stress concentration at the connection, improve the stability and overall strength of the connection, and thus be able to more effectively transmit the force, thereby enhancing the durability and safety of the bridge.

[0047] In some embodiments, the corresponding steel bar patching section 41 is produced and processed according to the measurement results, including: L2=L-2*(L1+δ) Wherein, L represents the distance between two adjacent prefabricated bridge panels 2; L1 represents the thread length of the protruding end of the embedded steel bar 43; L2 represents the overall length of the steel bar embedded section 41; δ represents the gap between the embedded steel bar 43 and the steel bar embedded section 41 when connected.

[0048] Through the above arrangement, it can be ensured that the produced and processed steel bar embedded section 41 can be fully adapted, the firmness and reliability of the connection are ensured, the consistency of the structural strength is guaranteed, and the overall stability and safety of the bridge are improved.

[0049] In some embodiments, when the pre-processed sleeves 42 are screwed into the two ends of the steel bar embedding section 41, the sleeves 42 should be screwed in completely.

[0050] The above arrangement avoids interference with the placement of the steel bar embedding section 41 at the docking position, and facilitates operators to observe and adjust the gap between the embedded steel bars 43 and the steel bar embedding section 41 .

[0051] In some embodiments, before unscrewing the sleeves 42 at both ends of the steel bar embedded section 41 and initially connecting with the embedded steel bar 43, the following steps are further included: The gap between the steel bar embedding section 41 and the pre-embedded steel bars 43 on both sides is adjusted to be evenly divided.

[0052] Through the above-mentioned arrangement, the structural stress is optimized, ensuring that the connection between the steel bar embedded section 41 and the embedded steel bars 43 on both sides is more uniform and stable, thereby reducing stress concentration at the connection, improving the durability and safety of the connection, avoiding connection failure caused by local overload, and improving the overall bearing capacity and stability of the bridge structure, which can better resist deformation and damage.

[0053] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A wet joint steel bar connection structure for a steel-concrete composite beam bridge, characterized in that: include: Steel beams; Prefabricated bridge decks are overlapped on the upper surface of the steel beam, and a wet joint is formed between two adjacent prefabricated bridge decks at the top of the steel beam; A plurality of connection components are arranged at intervals and connect two adjacent prefabricated bridge panels; Wherein, each of the connection components comprises: A steel bar patching section is located in the wet joint; Two sleeves are respectively threadedly sleeved on the two ends of the steel bar embedding section; Two embedded steel bars are respectively embedded in two adjacent prefabricated bridge panels, and one end of each of the two steel bars extends from the edge of the prefabricated bridge panels into the wet joint and is threadedly sleeved with one of the sleeves.

2. The wet joint steel bar connection structure of the steel-concrete composite beam bridge according to claim 1 is characterized in that: The distance between two adjacent prefabricated bridge panels is L; The protruding end of the embedded steel bar is provided with an external thread, and the thread length is L1; The overall length of the steel bar embedding section is L2; Both ends of the steel bar patching section are provided with external threads, and the thread length is L3; The sleeve is provided with a full-length internal thread, and the thread length is L4; The gap between the embedded steel bars and the steel bar patching section when connected is δ; Among them, L2=L-2*(L1+δ), L3=2*L1, L4=2*L1+δ.

3. The wet joint steel bar connection structure of the steel-concrete composite beam bridge according to claim 2 is characterized in that: The thread direction and pitch of the external threads at both ends of the reinforcing steel bar embedding section are respectively consistent with the external threads at the protruding ends of the adjacent embedded steel bars.

4. The wet joint steel bar connection structure of a steel-concrete composite beam bridge according to claim 2, characterized in that: δ satisfies: δ≤5.0mm.

5. The wet joint steel bar connection structure of the steel-concrete composite beam bridge according to claim 2, characterized in that: The external threads at both ends of the steel bar embedding section have opposite thread directions and the same thread pitch.

6. A method for connecting wet joint steel bars of a steel-concrete composite beam bridge, characterized in that: The wet joint steel bar connection structure of a steel-concrete composite beam bridge according to any one of claims 1 to 5 comprises the following steps: S1: Install the steel beam, overlap two prefabricated bridge panels on the upper surface of the steel beam, and then adjust the position of the prefabricated bridge panels to meet the accuracy requirements before positioning; S2: Measure the distance between two adjacent prefabricated bridge panels, count and number them, and then produce and process the corresponding steel bar embedding sections according to the measurement results; S3: Screw the pre-processed sleeves into both ends of the steel bar patching section; S4: Place the steel bar patching sections at the steel bar docking positions in the wet joints according to the numbers, then screw out the sleeves at both ends of the steel bar patching sections to make initial connections with the embedded steel bars, and then perform the tightening operation until the sleeves are tightened to the threaded ends of the embedded steel bars.

7. The method for connecting wet joint steel bars of a steel-concrete composite beam bridge according to claim 6, characterized in that: The precision requirement is that the axial deviation between the two corresponding embedded steel bars is ≤5.0mm.

8. The method for connecting steel-concrete composite beam bridge wet joint steel bars according to claim 6, characterized in that: The method of producing and processing corresponding steel bar embedding sections according to the measurement results includes: L2=L-2*(L1+δ) Where L represents the distance between two adjacent precast bridge decks; L1 represents the thread length of the protruding end of the embedded steel bar; L2 represents the overall length of the steel bar embedded section; δ represents the gap between the embedded steel bar and the steel bar embedded section when connected.

9. The method for connecting steel-concrete composite beam bridge wet joint steel bars according to claim 6, characterized in that: When the pre-processed sleeves are screwed into the two ends of the steel bar embedding section, the sleeves should be screwed in completely.

10. The method for connecting steel-concrete composite beam bridge wet joint steel bars according to claim 6, characterized in that: The sleeves at both ends of the steel bar patch section are screwed out, and before the initial connection with the embedded steel bar is made, the following steps are also included: The gap between the steel bar embedding section and the pre-buried steel bars on both sides is adjusted to be evenly divided.

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