Segmental precast assembled steel-concrete composite beam and construction method thereof

Abstract

The application discloses a segment prefabricated assembling steel concrete composite beam and a construction method thereof, and belongs to the technical field of steel concrete composite beams. The composite beam comprises a steel beam body, a bridge deck plate one and a bridge deck plate two. Two steel beam bodies are symmetrically arranged, a reinforcing cross beam is arranged in clamping connection between the two steel beam bodies, a limiting reinforcing mechanism is arranged on the side of the steel beam body away from the reinforcing cross beam, and the limiting reinforcing mechanism is used for limiting and reinforcing the reinforcing cross beam. Bottom end plates are symmetrically arranged at the bottom ends of the bridge deck plate one, the bottom of the bridge deck plate one and the bottom end plates are in clamping connection with the steel beam body, the bridge deck plate two is arranged on the top of the bridge deck plate one, and a stand column is arranged in clamping connection between the bridge deck plate one and the bridge deck plate two. The technical scheme can effectively solve the problem that the existing prefabricated assembling steel concrete composite beam has a single assembling structure and is usually reinforced by using prestressed tendons, thereby causing low installation efficiency, and significantly improves the installation stability and the installation efficiency of the composite beam.

Description

Technical Field

[0001] This invention relates to the field of steel-concrete composite beam technology, specifically to a segmental prefabricated steel-concrete composite beam and its construction method. Background Technology

[0002] Prefabricated bridge structures help ensure project quality, accelerate project progress, and reduce the impact of construction on traffic and the environment, resulting in significant socio-economic benefits. Steel-concrete composite bridge structures combine the tensile strength of steel and the compressive strength of concrete, offering advantages such as high structural performance and strong spanning capacity. They are currently widely used in municipal bridges, highway bridges, and other fields.

[0003] A search revealed existing publications regarding segmental precast steel-concrete composite beams, such as Chinese Patent Application No. 202310134184.X, filed on February 20, 2023, entitled "Segmental Precast Steel-Concrete Composite Beam and its Construction Method." This application includes steel beams and bridge decks. The steel beams have multiple shear connectors along their length. Corresponding to each of the shear connectors, the bridge decks have bottom grooves extending and penetrating along the corresponding steel beams. Transverse reinforcing bars are installed within these bottom grooves. Multiple prestressed ducts are installed within the bridge decks, connecting to adjacent bridge decks via prestressing tendons and corresponding anchorages. Each bridge deck has multiple pouring holes and venting holes communicating with the bottom grooves, and is fixed to the two steel beams by casting concrete from the corresponding pouring holes. During construction, the bridge decks are laid sequentially on the steel beams, prestressing tendons and corresponding anchorages are installed for connection, and then concrete is poured into the pouring holes for fixation. The technical solution proposed in this application avoids the on-site construction procedures for longitudinal and transverse wet joints between precast panels in existing technologies, while also providing reliable connection performance. However, the assembly structure in this application is relatively simple and uses prestressed tendons for reinforcement, which does not effectively improve installation efficiency and is difficult to meet the needs of existing users. Summary of the Invention

[0004] 1. The problem to be solved

[0005] To address the shortcomings of existing precast precast steel-concrete composite beams, such as their relatively simple assembly structure and the low installation efficiency caused by the common use of prestressed tendons for reinforcement, this invention provides a segmental precast steel-concrete composite beam and its construction method. The technical solution of this invention can effectively solve the above problems and significantly improve the installation stability and efficiency of the composite beam.

[0006] 2. Technical Solution

[0007] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0008] The present invention discloses a segmental precast steel-concrete composite beam, comprising a steel beam body, a bridge deck one, and a bridge deck two. Two steel beam bodies are symmetrically arranged, and a reinforcing crossbeam is snap-fitted between the two steel beam bodies. A limiting and reinforcing mechanism is provided on the side of the steel beam body away from the reinforcing crossbeam for limiting and reinforcing the reinforcing crossbeam. The bottom ends of the bridge deck one are symmetrically provided with bottom plates, and the bottom and bottom plates of the bridge deck one are snap-fitted and connected to the steel beam body. The bridge deck two is located on top of the bridge deck one, and a column is snap-fitted and fixedly installed between the bridge deck one and the bridge deck two.

[0009] As a further improvement of the present invention, a circular groove is machined in the middle of one side of each of the two steel beams facing each other, and a groove 1 is symmetrically machined on the upper and lower sides of the circular groove; a threaded groove 1 is machined on the other side of the steel beam away from the circular groove, the threaded groove 1 is coaxial with the circular groove, and the diameter of the threaded groove 1 is smaller than the diameter of the circular groove; a groove 2 is machined on the other side of the steel beam away from the groove 1, the groove 2 is coaxial with the groove 1, and the diameter of the groove 2 is smaller than the diameter of the groove 1.

[0010] Both ends of the reinforced crossbeam are fixedly connected to connecting plates. A circular locking post that engages with the circular locking slot is fixedly connected to the connecting plates. A locking rod 1 that engages with the locking slot 1 is fixedly connected to the upper and lower ends of the circular locking post. A limiting groove is machined at the center of the locking rod 1. The diameter of the limiting groove is the same as that of the locking slot 2.

[0011] The limiting and reinforcing mechanism includes a positioning plate, which is located on the side of the steel beam away from the connecting plate. The positioning plate has two locking rods at its upper and lower ends that engage with the locking groove. The free ends of the locking rods are inserted and engaged in the limiting groove.

[0012] As a further improvement of the present invention, a mounting bolt is threadedly connected to the center of the positioning plate. The mounting bolt passes through the threaded groove to the circular locking post, and the mounting bolt is threadedly connected to the threaded groove and the circular locking post.

[0013] As a further improvement of the present invention, the bottom end plate is symmetrically welded to both ends of the bottom of the bridge deck, and a placement groove is processed at the center of the bottom end plate, in which a snap-fit ​​plate is fixedly connected; the upper part of the steel beam extends through the interior of the snap-fit ​​plate and snaps into it.

[0014] As a further improvement of the present invention, it also includes a second mounting bolt. The steel beam body has two threaded grooves symmetrically machined on both sides. One end of the second mounting bolt passes through the bottom plate and the first snap-fit ​​plate in sequence, and then passes through the inside of the second threaded groove to be threadedly connected to the second threaded groove.

[0015] As a further improvement of the present invention, a groove three is machined at the bottom of the bridge deck, and a snap-fit ​​plate two is fixedly connected to the inner wall of the groove three. The top of the steel beam penetrates into the interior of the snap-fit ​​plate two and snaps into the snap-fit ​​plate two.

[0016] As a further improvement of the present invention, two columns are symmetrically arranged between bridge deck 1 and bridge deck 2 located above a steel beam, and a support net is fixedly installed between the two columns. Furthermore, pouring holes are opened at both sides of bridge deck 1 and bridge deck 2.

[0017] As a further improvement of the present invention, positioning blocks are fixedly connected to both ends of the column, and the two positioning blocks are respectively engaged with the positioning grooves machined on the bridge panel one and the bridge panel two.

[0018] As a further improvement of the present invention, the center of the column and the two positioning blocks are provided with threaded grooves three, and the bridge panel two is threadedly connected with mounting bolts three. The bottom of the mounting bolts three passes through the threaded grooves three and the bridge panel one in sequence, and is threadedly connected to the threaded grooves three and the bridge panel one.

[0019] The construction method of the above-mentioned segmental precast assembled steel-concrete composite beam of the present invention includes the following steps:

[0020] Step 1: Install the reinforcing crossbeam between the two steel beams;

[0021] Step 2: Install the limiting and reinforcing mechanism to reinforce the crossbeam;

[0022] Step 3: Place the bridge deck plate on top of the two steel beams, so that the two bottom end plates are snapped into the steel beams to complete the connection;

[0023] Step 4: Install the columns. After installation, install bridge deck 2 to complete the fixing of bridge deck 1, columns, and bridge deck 2.

[0024] Step 5: Pour concrete.

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] (1) A segmental precast assembled steel-concrete composite beam of the present invention includes a steel beam body, a bridge deck 1 and a bridge deck 2. A reinforcing crossbeam is set between the two steel beam bodies, and the installation structure of the reinforcing crossbeam is optimized. Through the design of a slot 1, a slot 2, a circular slot, a circular post, a threaded groove 1, a rod 1, a limiting groove, a rod 2 and a mounting bolt 1, the steel beam body and the reinforcing crossbeam have the characteristic of being able to be assembled, which significantly improves the installation efficiency. At the same time, it is also convenient for users to carry and transport, reducing the space occupied during transportation.

[0028] (2) A segmental prefabricated steel-concrete composite beam of the present invention, wherein a bridge deck 1 and a bridge deck 2 are provided on the top of the steel beam body. Through the design of threaded groove 2, placement groove, snap-fit ​​plate 1, mounting bolt 2, snap-fit ​​groove 3, snap-fit ​​plate 2, positioning groove, column, positioning block, threaded groove 3 and mounting bolt 3, it is convenient for users to quickly install and fix bridge deck 1 and bridge deck 2 on the top of the steel beam body. The design of this assembly structure and threaded connection can improve the firmness between the steel beam body and bridge deck 1 and bridge deck 2 after assembly.

[0029] (3) The construction method of the segmental prefabricated steel-concrete composite beam of the present invention allows for the direct assembly and reinforcement of the steel beam body, the reinforcing crossbeam, the bridge deck one and the bridge deck two during construction. Finally, concrete is poured to complete the assembly of the composite beam. Compared with the conventional assembly of existing composite beams, the installation efficiency is significantly improved while ensuring installation stability. Moreover, the assembly process of the composite beam of the present invention is simple and greatly reduces the construction difficulty. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of the segmental prefabricated steel-concrete composite beam of the present invention;

[0031] Figure 2 This is a structural sectional view of the segmental prefabricated steel-concrete composite beam of the present invention;

[0032] Figure 3 In this invention Figure 2 A magnified view of part A in the diagram;

[0033] Figure 4 In this invention Figure 2 A magnified view of part B in the diagram;

[0034] Figure 5 In this invention Figure 2 A magnified view of part of C;

[0035] Figure 6 In this invention Figure 2 A magnified view of part of D;

[0036] Figure 7 This is a three-dimensional structural diagram of the support mesh of the present invention.

[0037] In the picture:

[0038] In the diagram: 1. Steel beam; 2. Reinforcing crossbeam; 3. Slot 1; 4. Slot 2; 5. Circular slot; 6. Connecting plate; 7. Circular locking post; 8. Threaded slot 1; 9. Locking rod 1; 10. Limiting slot; 11. Positioning plate; 12. Locking rod 2; 13. Mounting bolt 1; 14. Bridge deck 1; 15. Bridge deck 2; 16. Threaded slot 2; 17. Bottom plate; 18. Placement slot; 19. Locking plate 1; 20. Mounting bolt 2; 21. Slot 3; 22. Locking plate 2; 23. Positioning slot; 24. Column; 25. Positioning block; 26. Support mesh; 27. Threaded slot 3; 28. Mounting bolt 3; 29. ​​Pouring hole. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0040] It should be noted that in the description of this invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0043] Example 1

[0044] like Figure 1 and Figure 2As shown, a segmental precast steel-concrete composite beam of this embodiment includes a steel beam body 1, a reinforcing crossbeam 2, a bridge deck 14 and a bridge deck 2 15. The composite beam of this embodiment includes two steel beam bodies 1 arranged symmetrically on the left and right, and a reinforcing crossbeam 2 is provided between the two steel beam bodies 1. The two ends of the reinforcing crossbeam 2 are snapped and installed on one side of the steel beam body 1, and a limiting and reinforcing mechanism is also provided on the other side of the steel beam body 1. The limiting and reinforcing mechanism is used to limit and reinforce the reinforcing crossbeam 2 to improve the assembly stability.

[0045] The bottom of the first bridge deck 14 is provided with bottom end plates 17 symmetrically located at both ends of the bottom of the first bridge deck 14. The bottom of the first bridge deck 14 and the bottom end plates 17 are both snapped and connected to the steel beam body 1. The second bridge deck 15 is located on top of the first bridge deck 14, and a column 24 is provided between the second bridge deck 15 and the first bridge deck 14. The top and bottom of the column 24 are snapped with the second bridge deck 15 and the first bridge deck 14, respectively.

[0046] Specifically, in combination Figure 1 and Figure 2-3 As shown, on one side of the two steel beams 1 facing each other, a circular slot 5 is machined in the middle of the upright. A slot 3 is symmetrically machined on the upper and lower sides of the circular slot 5. Connecting plates 6 are fixedly installed at both ends of the reinforcing beam 2. Circular locking posts 7, which engage with the circular slot 5, are fixedly connected to the connecting plates 6. Correspondingly, locking rods 9, which engage with the slot 3, are fixedly connected on the upper and lower sides of the circular locking posts 7. Through the cooperation of the circular slots 5 and circular locking posts 7, and the slots 3 and locking rods 9, the connection is firm, the operation is convenient, and the fast assembly of the reinforcing beam 2 and the steel beam 1 is achieved.

[0047] As another optimized implementation of this embodiment, to improve the stability after assembly and to provide a limiting and reinforcing effect on the reinforcing beam 2, a threaded groove 8 is machined on the side of the steel beam 1 away from the circular slot 5. The threaded groove 8 is coaxial with and connected to the circular slot 5, and the diameter of the threaded groove 8 is smaller than the diameter of the circular slot 5. Simultaneously, a second slot 4 is machined on the side of the steel beam 1 away from the first slot 3. The second slot 4 is coaxial with and connected to the first slot 3, and the diameter of the second slot 4 is smaller than the diameter of the first slot 3.

[0048] The limiting and reinforcing mechanism includes a positioning plate 11, which is disposed on one side of the upright of the steel beam 1 and relative to the reinforcing crossbeam 2. Symmetrical locking rods 12 are provided above and below the side of the positioning plate 11 that is in contact with the steel beam 1. The diameter of the locking rods 12 matches the diameter of the locking grooves 4. During limiting and reinforcing, the locking rods 12 on the positioning plate 11 engage with the locking grooves 4.

[0049] In addition, a limiting groove 10 is machined at the center of the end of the first clamping rod 9 away from the connecting plate 6. The diameter of the limiting groove 10 is the same as that of the second clamping groove 4, and the length of the second clamping rod 12 is greater than that of the second clamping groove 4. During assembly, the free end of the second clamping rod 12 is inserted and engaged in the limiting groove 10, which further increases the contact area of ​​the engagement. This double engagement method can significantly improve the firmness and stability of the engagement, and fully ensure the assembly firmness and stability of the reinforced crossbeam 2.

[0050] In addition, to further improve the installation effect of the reinforced crossbeam 2, based on the above structure, an installation bolt 13 is threadedly connected at the center of the positioning plate 11. The installation bolt 13 passes through the threaded groove 8 to the circular locking post 7. The installation bolt 13 is threadedly connected to the threaded groove 8 and the circular locking post 7. This setting significantly improves the assembly stability of the reinforced crossbeam 2 and the steel beam body 1.

[0051] Example 2

[0052] Reference Figure 1-2 and Figure 4-5 This embodiment of a segmental precast steel-concrete composite beam has a main structure that is basically the same as that of Embodiment 1. The main difference between the two embodiments is that bottom end plates 17 are welded to both sides of the bottom of the bridge deck 14. Figure 1 Taking the Chinese position as an example, the bottom of the bridge deck 14 is welded with a bottom plate 17 at the position above the two steel beams 1.

[0053] like Figure 2 and Figure 4 As shown, threaded grooves 16 are symmetrically provided on both sides of the upper part of the steel beam 1, and a placement groove 18 is provided at the center of the bottom of the bottom plate 17. A snap-fit ​​plate 19 is fixedly connected inside the placement groove 18. The upper part of the steel beam 1 extends through the interior of the snap-fit ​​plate 19 and snaps into it. The assembly is completed by the snap-fit ​​connection between the snap-fit ​​plate 19 and the upper part of the steel beam 1.

[0054] In addition, to further improve the reliable connection between the steel beam 1 and the bridge deck 14, such as Figure 5 As shown, the bottom of the bridge deck 14 is provided with a slot 21 at the center of both ends. The inner wall of the slot 21 is fixedly connected to a snap-fit ​​plate 22. The top of the steel beam 1 extends into the slot 21, passes through the inside of the snap-fit ​​plate 22, and snaps with the snap-fit ​​plate 22. At the same time, the upper part of the steel beam 1 passes through the inside of the snap-fit ​​plate 19 and snaps with the snap-fit ​​plate 19. This allows the user to easily snap and limit the top of the bridge deck 14 and the top of the steel beam 1.

[0055] More optimized, such as Figure 4As shown, the system also includes mounting bolts 20. Two threaded grooves 16 are symmetrically machined on the vertical sidewall where the steel beam 1 engages with the clamping plate 19. Threaded through holes are also machined at corresponding positions on the bottom plate 17 and the clamping plate 19, with the diameter of the threaded through holes being the same as the diameter of the threaded grooves 16. Mounting bolts 20 are threaded onto both sides of the bottom end of the bottom plate 17, with one end of each bolt penetrating into the threaded groove 16 and threadedly connected to it. The design of mounting bolts 20 further enhances the firmness of the connection between the bridge deck 14 and the steel beam 1, improving the structural stability of the composite beam.

[0056] Example 3

[0057] Reference Figure 1-2 and Figure 6-7 This embodiment of a segmental precast steel-concrete composite beam has a main structure that is basically the same as that of embodiment 2. The main difference between the two embodiments is that: in this embodiment, four columns 24 are provided, and each pair of columns 24 forms a group. That is, two columns 24 are symmetrically provided between bridge deck 14 and bridge deck 25 above a steel beam body 1, and a support net 26 is fixedly assembled between the two columns 24 in each group. Furthermore, pouring holes 29 are provided on both sides of bridge deck 14 and bridge deck 25.

[0058] Specifically, such as Figure 6 As shown, positioning grooves 23 are machined on the top of bridge deck 14 and the bottom of bridge deck 25 corresponding to the installation positions of the columns 24. Positioning blocks 25 are fixedly connected to the top and bottom of the columns 24. The end of the positioning block 25 away from the column 24 passes through the interior of the positioning groove 23 and engages with the positioning groove 23. Through the cooperation of the positioning block 25 and the positioning groove 23, the column 24 is detachably installed with bridge deck 14 and bridge deck 25, thereby realizing the assembly connection of bridge deck 14 and bridge deck 25. The operation is simple and the installation efficiency is high.

[0059] like Figure 7 As shown, the center of the column 24 and the two positioning blocks 25 are provided with threaded grooves 27. The bridge panel 2 15 is threadedly connected with mounting bolts 28. The bottom of the mounting bolts 28 passes through the threaded grooves 27 and the bridge panel 1 14 in sequence, and is threadedly connected to the threaded grooves 27 and the bridge panel 1 14. Through the design of the mounting bolts 28, it is convenient for users to fix the bridge panel 2 15 to the top of the bridge panel 1 14, and the connection is further improved.

[0060] Furthermore, this invention provides a construction method for segmental precast assembled steel-concrete composite beams, comprising the following steps:

[0061] Step 1: Install the reinforcing beam 2 between the two steel beams 1;

[0062] Specifically, the user first attaches the circular clips 7 and two clip rods 9 on the connecting plates 6 at both ends of the reinforcing beam 2 into the circular clips 5 and two clips 3 opened at opposite ends of the two steel beams 1, thus completing the connection.

[0063] Step 2: Install the limiting and reinforcing mechanism to reinforce the reinforcing beam 2;

[0064] The user attaches the two locking rods 12 on one side of the positioning plate 11 into the locking groove 4 and the limiting groove 10, and fixes the positioning plate 11 and the connecting plate 6 to both sides of the steel beam 1 with the mounting bolts 13 to complete the reinforcement.

[0065] Step 3: Place the bridge deck 14 on top of the two steel beams 1, so that the two bottom end plates 17 of the bottom of the bridge deck 14 are respectively engaged with the top of the steel beams 1 below it, and rotate the mounting bolts 20 from the side of the bottom end plates 17 into the inside of the threaded grooves 16 to fix the bridge deck 14 on top of the steel beams 1, thus completing the installation of the bridge deck 14 and the steel beams 1.

[0066] Step 4: Install column 24. After installation, install bridge deck 2 15 to complete the fixing of bridge deck 1 14, column 24 and bridge deck 2 15.

[0067] Specifically, the user places the positioning blocks 25 at the bottom of the columns 24 at both ends of the support net 26 into the positioning grooves 23 opened on the top surface of the bridge deck 14, and then places the bridge deck 25 on top of the bridge deck 14, so that the positioning grooves 23 at the bottom of the bridge deck 25 engage with the positioning blocks 25 at the top of the columns 24, and fixes the bridge deck 25 and the columns 24 on top of the bridge deck 14 by using the mounting bolts 3 28.

[0068] Step 5: Pour concrete through the pouring hole 29 opened on the surface of bridge deck 2 15.

[0069] This invention optimizes the installation structure of the steel beam 1 and the reinforcing crossbeam 2, making it modular and easy for users to assemble, carry, and transport, while also reducing the space occupied during transportation. Simultaneously, the design of the assembly structure for bridge deck 14 and bridge deck 2 15 allows users to quickly install and fix them to the top of the steel beam 1. This assembly structure and threaded connection design improve the robustness between the assembled steel beam 1 and bridge deck 14 and bridge deck 2 15, meeting the needs of existing users.

[0070] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0071] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A segmental precast assembled steel-concrete composite beam, characterized in that: The bridge includes a steel beam body (1), a bridge deck one (14), and a bridge deck two (15). There are two steel beam bodies (1) symmetrically arranged. A reinforcing crossbeam (2) is snapped between the two steel beam bodies (1). A limiting and reinforcing mechanism is provided on the side of the steel beam body (1) away from the reinforcing crossbeam (2) to limit and reinforce the reinforcing crossbeam (2). The bottom end plates (17) are symmetrically arranged at both ends of the bottom of the bridge deck one (14). The bottom of the bridge deck one (14) and the bottom end plates (17) are snapped and connected to the steel beam body (1). The bridge deck two (15) is located on the top of the bridge deck one (14), and a column (24) is snapped and fixed between the bridge deck one (14) and the bridge deck two (15). Two steel beams (1) are each machined with a circular slot (5) in the middle of one side facing each other, and slots 1 (3) are machined symmetrically on the upper and lower sides of the circular slots (5); a threaded groove 1 (8) is machined on the other side of the steel beam (1) away from the circular slots (5), the threaded groove 1 (8) is coaxial with the circular slots (5), and the diameter of the threaded groove 1 (8) is smaller than the diameter of the circular slots (5); a slot 2 (4) is machined on the other side of the steel beam (1) away from the slot 1 (3), the slot 2 (4) is coaxial with the slot 1 (3), and the diameter of the slot 2 (4) is smaller than the diameter of the slot 1 (3); Both ends of the reinforced crossbeam (2) are fixedly connected to a connecting plate (6). A circular locking post (7) that engages with the circular slot (5) is fixedly connected to the connecting plate (6). The upper and lower ends of the circular locking post (7) are fixedly connected to a locking rod (9) that engages with the slot (3). A limiting groove (10) is machined at the center of the locking rod (9). The diameter of the limiting groove (10) is the same as that of the slot (4). The limiting and reinforcing mechanism includes a positioning plate (11), which is located on the side of the steel beam (1) away from the connecting plate (6). The upper and lower ends of the positioning plate (11) are machined with a second clamping rod (12) that engages with the second clamping groove (4). The free end of the second clamping rod (12) is inserted and engaged in the limiting groove (10).

2. The segmental precast assembled steel-concrete composite beam according to claim 1, characterized in that: The positioning plate (11) is threaded with a mounting bolt (13) at its center. The mounting bolt (13) passes through the threaded groove (8) to the circular locking post (7). The mounting bolt (13) is threadedly connected to the threaded groove (8) and the circular locking post (7).

3. A segmental precast assembled steel-concrete composite beam according to any one of claims 1-2, characterized in that: The bottom end plate (17) is symmetrically welded to both ends of the bottom of the bridge deck (14). A placement groove (18) is machined at the center of the bottom end plate (17), and a snap-fit ​​plate (19) is fixedly connected in the placement groove (18). The upper part of the steel beam body (1) extends through the interior of the snap-fit ​​plate (19) and snaps with the snap-fit ​​plate (19).

4. A segmental precast assembled steel-concrete composite beam according to claim 3, characterized in that: It also includes mounting bolt two (20), and the steel beam body (1) has symmetrically machined threaded groove two (16) on both sides. One end of the mounting bolt two (20) passes through the bottom end plate (17) and the snap-fit ​​plate one (19) in sequence, and passes through the inside of the threaded groove two (16) and is threadedly connected to the threaded groove two (16).

5. A segmental precast assembled steel-concrete composite beam according to any one of claims 1-2, characterized in that: The bottom of the bridge deck (14) is machined with a slot (21), and the inner wall of the slot (21) is fixedly connected to a snap-fit ​​plate (22). The top of the steel beam (1) extends through the interior of the snap-fit ​​plate (22) and snaps into the snap-fit ​​plate (22).

6. A segmental precast assembled steel-concrete composite beam according to any one of claims 1-2, characterized in that: Two columns (24) are symmetrically arranged between bridge deck 1 (14) and bridge deck 2 (15) located above a steel beam body (1), and a support net (26) is fixedly installed between the two columns (24). Pouring holes (29) are opened on both sides of bridge deck 1 (14) and bridge deck 2 (15).

7. A segmental precast assembled steel-concrete composite beam according to claim 6, characterized in that: Both ends of the column (24) are fixedly connected with positioning blocks (25), and the two positioning blocks (25) are respectively engaged with the corresponding positioning grooves (23) processed on the bridge deck one (14) and the bridge deck two (15).

8. A segmental precast assembled steel-concrete composite beam according to claim 7, characterized in that: The center of the column (24) and the two positioning blocks (25) are provided with threaded grooves (27). The bridge deck (15) is threaded with mounting bolts (28). The bottom of the mounting bolts (28) passes through the threaded grooves (27) and the bridge deck (14) in sequence, and is threadedly connected to the threaded grooves (27) and the bridge deck (14).

9. A construction method for a segmental precast assembled steel-concrete composite beam as described in any one of claims 1-8, characterized in that: Includes the following steps: Step 1: Install the reinforcing beam (2) between the two steel beams (1); Step 2: Install the limiting and reinforcing mechanism to reinforce the reinforcing beam (2); Step 3: Place the bridge deck panel (14) on top of the two steel beams (1) so that the two bottom end plates (17) are snapped into the steel beams (1) to complete the connection; Step 4: Install the column (24), and after installation, install the bridge deck 2 (15) to complete the fixing of the bridge deck 1 (14), column (24) and bridge deck 2 (15); Step 5: Pour concrete.

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