Asymmetric spatial linear Y-shaped steel structure and installation method thereof

Abstract

The application discloses an asymmetric space linear Y-shaped steel structure and a mounting method thereof, which comprises a Y-shaped support and a cable-stayed tower; a first segment of a rear cantilever is hoisted to a steel-concrete joint segment, the first segment of the rear cantilever is welded to the steel-concrete joint segment, and the first segment of the rear cantilever is hung on the cable-stayed tower through a stay cable; a first segment of a front cantilever is completed; the rear cantilever is constructed to a position in front of the corresponding Y-shaped support; a rear segment of the rear cantilever is hoisted to the Y-shaped support in sequence, welding construction is completed, a rear segment of the front cantilever is hoisted to a corresponding position, and welding construction is completed; the rear segment of the rear cantilever and the rear segment of the front cantilever are pulled through a stay cable; a rear end beam is hoisted to a position between the last segments of the two rear cantilevers, and the rear end beam is welded to the rear cantilevers; and a side main beam at both sides of a top of a Y-shaped steel structure monomer is mounted from the rear cantilever to the front cantilever. The application has the effects of reducing construction difficulty and reducing required cost.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to an asymmetric spatial linear Y-shaped steel structure and its installation method. Background Technology

[0002] With my country's economic development, there is an increasing need for long-span bridges, and the structural forms of bridges are becoming more and more novel. Among them, the Y-shaped steel structure is one such example. The Y-shaped steel structure is a bridge type that evolved from the V-pier continuous rigid frame. It has the stress characteristics of a continuous beam and a slanted leg rigid frame. Compared with continuous beam bridges of the same span, this type of bridge is lightweight and aesthetically pleasing, making it a better bridge type for urban river-crossing bridges.

[0003] Currently, after the main tower and the steel-concrete composite section are completed, and before the front and rear cantilever sections need to be constructed one by one, a Y-shaped support frame needs to be erected from the ground directly below the corresponding construction positions of the front and rear cantilever sections. Then, each section is hoisted to the corresponding position by cables and placed on the Y-shaped support frame. Finally, the sections are welded to the steel-concrete composite section to complete the construction of each section.

[0004] Regarding the aforementioned technologies, when constructing high bridges that require navigation, main towers are typically erected on both sides of the river. Therefore, if Y-shaped supports need to be erected at both the cantilever and rear cantilever positions before construction, not only will they need to be erected in the river, making the erection difficult, but also requiring a large number of overall supports. This is especially true for double Y-shaped steel structures, where the required supports will increase exponentially, resulting in a significant increase in the corresponding costs. Summary of the Invention

[0005] To reduce construction difficulty and costs, this application provides an asymmetric spatial linear Y-shaped steel structure and its installation method.

[0006] Firstly, this application provides an asymmetric spatial linear Y-shaped steel structure, which adopts the following technical solution:

[0007] An asymmetric spatial linear Y-shaped steel structure includes: a pair of Y-shaped steel structure units interlocked with each other; each Y-shaped steel structure unit includes: a main tower, a steel-concrete composite section, a rear cantilever, a front cantilever, and a side main beam; the steel-concrete composite section is located at the top of the main tower; the rear cantilever and the front cantilever are respectively welded to both sides of the steel-concrete composite section; the angle between the rear cantilever and the main tower is smaller than the angle between the front cantilever and the main tower; the side main beam is erected between the rear cantilever and the front cantilever; a central crossbeam connects the steel-concrete composite sections of the two Y-shaped steel structure units; a rear end beam is installed between the tail ends of the two rear cantilevers; the side main beam is connected to the rear end beam.

[0008] By adopting the above technical solution, the main tower is constructed first, and then a steel-concrete composite section is poured at the top of the main tower, forming a central crossbeam to improve the overall stability between the two steel-concrete composite sections. Next, the rear and front cantilever arms are welded to both sides of the steel-concrete composite section, with the steel-concrete composite section, rear cantilever arm, and front cantilever arm arranged in an inward-interlocking configuration. This ensures that the stress direction during subsequent load-bearing is inward, reducing the possibility of the two Y-shaped steel structure units bending outward and improving overall safety. Finally, the construction of the side main beams is completed, forming a triangle between the steel-concrete composite section, rear cantilever arm, front cantilever arm, and side main beams, further enhancing overall stability. The addition of a rear end beam further strengthens the connection between the two rear cantilever arms.

[0009] Preferably, both the rear suspension beam and the front cantilever comprise several segments, with adjacent segments welded together.

[0010] By adopting the above technical solution, the construction of the rear and front cantilever beams is facilitated, and the degree of freedom is greater during the hoisting process.

[0011] Secondly, this application provides an installation method for an asymmetric spatial linear Y-shaped steel structure, which adopts the following technical solution:

[0012] An installation method for an asymmetric spatial linear Y-shaped steel structure, based on the asymmetric spatial linear Y-shaped steel structure, the installation method includes:

[0013] Step 1: Construct a Y-frame support at the rear section of the two rear cantilever sections, and construct cable-stayed towers on the two steel-concrete composite sections;

[0014] Step 2: Hoist the first segment of the rear cantilever to the steel-concrete composite section, weld the first segment of the rear cantilever to the steel-concrete composite section, hang the first segment of the rear cantilever on the cable-stayed tower using stay cables, and then release the cables; use the above method to complete the construction of the first segment of the front cantilever.

[0015] Step 3: Using the method in Step 2, construct the rear cantilever to the position in front of the corresponding Y-shaped support;

[0016] Step 4: The rear cantilever segments are hoisted sequentially onto the Y-shaped support frame to complete the welding. The same number of front cantilever segments are then hoisted to their corresponding positions and welded. The corresponding rear cantilever segments and front cantilever segments are then pulled together by the tie cables, and the cables are then released.

[0017] Step 5: Hoist the rear end beam to the position between the last segments of the two rear cantilever arms, weld the rear end beam to the rear cantilever arms, and then release the cable hooks;

[0018] Step Six: Install the side main beams on both sides of the top of the Y-shaped steel structure unit in sequence from the rear cantilever to the front cantilever until a complete Y-shaped steel structure unit is formed.

[0019] By adopting the above technical solution, and referring to Figure 1 For bridges that require navigation or are built in high-altitude areas, the main towers are erected on both sides of the span. Due to their height, only the rear cantilever and corresponding rear section require a Y-shaped support structure. This location, being on the shore at a higher altitude, makes erecting the Y-shaped support structure relatively easy. Furthermore, a cable-stayed crane is erected on the steel-concrete composite section. Erecting the cable-stayed crane at this location is not only convenient but also provides greater stability during the subsequent installation of the first half of the rear and front cantilever segments. The process involves sequentially installing the front and rear cantilever segments, with each segment suspended from the cable-stayed tower via stay cables. The rear cantilever segments are supported by Y-shaped brackets. Similarly, the front cantilever segments are stabilized by interlocking stay cables. After the front and rear cantilever segments are installed, the side beams are then installed, forming a stable triangular structure.

[0020] Preferably, in steps two and three, before the cable is released, the method further includes:

[0021] Temporary guy ropes are attached to both sides of each segment, with one temporary guy rope attached to the ground and the other temporary guy rope attached to the middle crossbeam.

[0022] In steps four and five, before the cable is released, the method further includes:

[0023] Remove the temporary guy ropes that were bound in steps two and three, and bind the temporary guy ropes to the sections installed in steps four and five.

[0024] By adopting the above technical solution, since the construction positions of the rear and front cantilever arms are relatively high, guy ropes are used to tighten both sides of each segment during the installation process, which can improve the stability of the entire installation process. In addition, when installing the rear segments of the rear and front cantilever arms, since the rear and front cantilever arms have been installed and stabilized, the previous temporary guy ropes can be removed and reused to bind the rear segments of the rear and front cantilever arms, thus achieving the purpose of reuse.

[0025] Preferably, the specific method of step six includes:

[0026] Install the side main beams on both sides of the top of the Y-shaped steel structure unit section by section from the rear cantilever towards the front cantilever, until they are erected at the cable-stayed tower.

[0027] A permanent tie rod is installed between the tail end of the rear cantilever and the tail end of the front cantilever;

[0028] Disconnect the tie cable between the rear segment of the rear cantilever and the rear segment of the front cantilever;

[0029] Continue laying the side main beams until a complete Y-shaped steel structure is formed.

[0030] By adopting the above technical solution, during the installation of the side main beam, since the angle between the rear cantilever and the main tower is smaller than the angle between the front cantilever and the main tower, the cables are tilted, which will obstruct the cables during the erection of the side main beam. Therefore, the side main beam is first erected to the cable-stayed tower for support. Then, a permanent tie rod is installed between the tail ends of the rear and front cantilever sections. Finally, the cables between the rear and front cantilever sections are removed to remove the obstruction, allowing the side main beam to be successfully installed.

[0031] Preferably, after step five and before step six, the method includes:

[0032] Triangular support blocks are welded to both the end of the rear cantilever away from the steel-concrete composite section and the end of the front cantilever away from the steel-concrete composite section.

[0033] By adopting the above technical solution, the connection between the two ends of the side main beam and the rear and front cantilever is more stable during the subsequent installation of the side main beam, which can further improve the stability of the overall Y-shaped steel structure.

[0034] Preferably, for each section of the side main beam laid, a connecting beam is installed between the side main beams at the top two sides of the Y-shaped steel structure to form a truss.

[0035] By adopting the above technical solution, the installation stability between the corresponding side beams in the two Y-shaped steel structure units can be further improved, and the stability of subsequent road paving on the Y-shaped steel structure can also be improved.

[0036] Preferably, after step three and before step four, a first temporary cross brace is installed between the two rear cantilever arms and between the two front cantilever arms; after step four and before step five, a second temporary cross brace is installed between the two front cantilever arms at the end away from the steel-concrete composite section.

[0037] By adopting the above technical solutions, the installation of the first and second temporary cross braces can further improve the stability of the rear and front cantilever installation process; and further reduce the possibility of collapse due to the inward buckling setting.

[0038] Preferably, the cable-stayed tower includes: a tower body and a plurality of support rods, the tower body being installed in the steel-concrete composite section; the top of the tower body is provided with a plurality of sliding grooves, and the plurality of support rods are respectively slidably installed in the tower body through the sliding grooves, the support rods being used to abut against the side main beam; the tower body is equipped with a limiting component for limiting the sliding position of the support rods.

[0039] By adopting the above technical solution, since the cable-stayed tower needs to support the side main beam during the installation process, when the cable-stayed tower needs to be dismantled after the installation of the entire Y-shaped steel structure is completed, the cable-stayed tower still has a certain pressure, making it difficult to dismantle. Therefore, before dismantling, the restraint on the support rod is first released by the limiting component, so that the support rod slides in the sliding groove and leaves the side main beam, creating a gap between the cable-stayed tower and the side main beam, which facilitates the dismantling of the cable-stayed tower.

[0040] Preferably, the support rods are arranged in two rows and located on both sides of the tower body, with the support rods on both sides corresponding to each other. The limiting component includes a sliding sleeve and a bidirectional cylinder. Each support rod is fitted with a sliding sleeve, and the sliding sleeves are slidably installed on the tower body. On the opposite sides of a pair of support rods, there are locking grooves for the inner wall of the sliding sleeve to engage. A bidirectional cylinder is installed between the two sliding sleeves of two corresponding support rods, and the two piston rods of the bidirectional cylinder are respectively connected to the two corresponding sliding sleeves.

[0041] By adopting the above technical solution, when it is necessary to loosen the restraint on the support rod, the bidirectional cylinder is activated to drive the two sliding sleeves to move towards each other, so that the inner wall of the sliding sleeve leaves the locking groove, and the support rod can slide away from the side main beam by its own gravity; the structure is simple and has high driving synchronization.

[0042] In summary, this application includes at least one of the following beneficial technical effects:

[0043] 1. A Y-shaped support structure is erected only at the rear cantilever and its corresponding rear section. This location, situated on the shore at a higher altitude, makes erecting the Y-shaped support structure relatively easy. A cable-stayed pylon is then constructed on the steel-concrete composite section. This location facilitates construction and its proximity to the rear and front cantilever sections enhances stability during subsequent installation of the first half of each segment. The first half segments of the rear and front cantilever sections are then installed sequentially, each segment suspended from the pylon by stay cables. The rear cantilever sections are supported by the Y-shaped support structure. Similarly, the rear cantilever sections are stabilized by stay cables, with each subsequent segment connected to the corresponding rear cantilever section. After the rear and front cantilever sections are installed, the side main beams are then installed, forming a stable triangular structure.

[0044] 2. Due to the high construction position of the rear and front cantilever arms, guy ropes are used to tighten both sides of each segment during installation, which improves the stability of the entire installation process. In addition, when installing the rear segments of the rear and front cantilever arms, since the rear and front cantilever arms have been installed and stabilized, the previous temporary guy ropes are removed and reused to bind the rear segments of the rear and front cantilever arms, achieving the purpose of reuse.

[0045] 3. The cables are inclined, which will obstruct the erection of the side main beam. Therefore, the side main beam is first erected to the cable-stayed tower for support. Then, a permanent tie rod is installed between the tail ends of the rear and front cantilever sections. Finally, the cables between the rear and front cantilever sections are removed to remove the obstruction and allow the side main beam to be successfully installed.

[0046] 4. During the installation of the side main beam, the cable-stayed tower needs to support the side main beam. Therefore, when the cable-stayed tower needs to be removed after the installation of the entire Y-shaped steel structure is completed, there is still a certain amount of pressure on the cable-stayed tower, making it difficult to remove. Therefore, before removal, the restraint on the support rod is loosened by the limiting component, so that the support rod slides in the sliding groove and leaves the side main beam, creating a gap between the cable-stayed tower and the side main beam, which facilitates the disassembly of the cable-stayed tower. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the installation environment of the Y-shaped steel structure in this application.

[0048] Figure 2 This is a front view of a Y-shaped steel structure unit of the asymmetric spatial linear Y-shaped steel structure according to an embodiment of this application.

[0049] Figure 3This is a top view of the Y-shaped steel structure of the asymmetric spatial linear Y-shaped steel structure according to an embodiment of this application.

[0050] Figure 4 This is a schematic diagram of construction step S10 of the asymmetric spatial linear Y-shaped steel structure installation method according to an embodiment of this application.

[0051] Figure 5 This is a schematic diagram of construction step S20 of the asymmetric spatial linear Y-shaped steel structure installation method according to an embodiment of this application.

[0052] Figure 6 This is a construction diagram (S30) of the asymmetric spatial linear Y-shaped steel structure installation method according to an embodiment of this application.

[0053] Figure 7 This is a schematic diagram of the temporary guy rope installation method for the asymmetric spatial linear Y-shaped steel structure installation method according to an embodiment of this application.

[0054] Figure 8 This is a construction diagram of the third segment of the rear cantilever in S40 of the asymmetric spatial linear Y-shaped steel structure installation method according to an embodiment of this application.

[0055] Figure 9 This is a construction diagram of the third segment of the front cantilever in S40 of the asymmetric spatial linear Y-shaped steel structure installation method of this application embodiment.

[0056] Figure 10 This is a top view of the rear and front cantilever arms after installation of the asymmetric spatial linear Y-shaped steel structure installation method according to the embodiments of this application.

[0057] Figure 11 This is a construction diagram (S70) of the asymmetric spatial linear Y-shaped steel structure installation method according to an embodiment of this application.

[0058] Figure 12 This is a schematic diagram of construction S80 of the asymmetric spatial linear Y-shaped steel structure installation method according to an embodiment of this application.

[0059] Figure 13 yes Figure 12 A magnified view of part A in the image.

[0060] Explanation of reference numerals in the attached figures:

[0061] 1. Y-shaped steel structure unit; 11. Main tower; 12. Steel-concrete composite section; 13. Rear cantilever; 14. Front cantilever; 15. Side main beam; 16. Middle crossbeam; 17. Permanent tie rod for side span; 18. Triangular support block; 2. Y-shaped support frame; 3. Cable-stayed tower; 31. Tower body; 311. Sliding groove; 32. Support rod; 321. Positioning groove; 4. Temporary guy rope; 5. First temporary cross brace; 6. Cable stays; 7. Tie cables; 8. Second temporary cross brace; 9. Limiting assembly; 91. Sliding sleeve; 92. Two-way cylinder. Detailed Implementation

[0062] The following is in conjunction with the appendix Figure 1-13 This application will be described in further detail.

[0063] This application discloses an asymmetric spatial linear Y-shaped steel structure. (Refer to...) Figure 2 and Figure 3 The asymmetric spatial linear Y-shaped steel structure includes a pair of Y-shaped steel structure units 1. Each Y-shaped steel structure unit 1 includes a main tower 11, a steel-concrete composite section 12, a rear cantilever 13, a front cantilever 14, and a side main beam 15. The main tower 11 is vertically arranged, and the steel-concrete composite section 12 is connected to the top of the main tower 11 by concrete. A central crossbeam 16 connects the steel-concrete composite sections 12 in the two Y-shaped steel structure units 1. The rear cantilever 13 and the front cantilever 14 are welded to both sides of the steel-concrete composite section 12, and the angle between the rear cantilever 13 and the main tower 11 is smaller than the angle between the front cantilever 14 and the main tower 11. After the rear cantilever 13, the front cantilever 14, and the steel-concrete composite section 12 in the two Y-shaped steel structure units 1 are combined, they are arranged in an inwardly interlocking manner (e.g., Figure 3 As shown); both the rear cantilever 13 and the front cantilever 14 include several segments. In this embodiment, the rear cantilever 13 and the front cantilever 14 are each provided with four segments as an example. The adjacent segments are welded together. The top elevation of the rear cantilever 13 is lower than the top elevation of the front cantilever 14, and the elevation of each segment of the rear cantilever 13 is lower than the elevation of each segment of the front cantilever 14.

[0064] The side main beam 15 extends horizontally and is located at the top between the rear cantilever beam and the front cantilever beam. The two ends of the side main beam 15 are connected to the ends of the rear cantilever beam away from the steel-concrete joint section 12 and the ends of the rear cantilever beam away from the steel-concrete joint section 12, respectively, thus forming a triangular stable structure between the side main beam 15, the rear cantilever beam and the front cantilever beam. A rear end beam is installed between the tail ends of the two rear end beams and is connected to the side main beam 15, thereby further improving the overall stability.

[0065] This application also discloses an installation method for an asymmetric spatial linear Y-shaped steel structure. The installation method includes the following:

[0066] S10: Reference Figure 4 Y-shaped support 2 is erected at the third and fourth segments of the two rear cantilever 13, and cable-stayed tower 3 is erected on the two steel-concrete composite sections 12.

[0067] S20: Reference Figure 5The first segment of the rear cantilever 13 is hoisted to the steel-concrete composite section 12 via cable. After adjustment and alignment, the first segment of the rear cantilever 13 is circumferentially welded to the steel-concrete composite section 12. The first segment of the rear cantilever 13 is then hung on the cable-stayed tower 3 via the stay cable 6, and the cable is then released. The first segment of the front cantilever 14 is constructed using the above method.

[0068] S30: Reference Figure 6 The second segment of the rear cantilever 13 and the second segment of the front cantilever 14 are constructed using the method in S20, i.e., constructed to the position in front of the Y-frame support 2.

[0069] In S20-S30, the method also includes, before the cable is released:

[0070] Reference Figure 7 Temporary guy ropes 4 are tied to both sides of each segment, with one temporary guy rope 4 tied to the ground and the other temporary guy rope 4 tied to the middle crossbeam 16.

[0071] Additionally, refer to Figure 7 The first temporary cross brace 5 is welded between the second segments of the two rear cantilever arms 13 and between the second segments of the two front cantilever arms 14.

[0072] S40: Reference Figure 8 and Figure 9 The rear segments of the rear cantilever 13 are sequentially hoisted onto the Y-shaped support 2 using cables. After alignment adjustments, welding is completed, thus completing the construction of the third and fourth segments of the rear cantilever 13. Similarly, the rear segments of the front cantilever 14, in equal numbers to the rear segments of the rear cantilever 13, are hoisted to their corresponding positions, aligned, and then welded, completing the construction of the third and fourth segments of the front cantilever 14. The construction process follows the sequence: third segment of rear cantilever 13 - third segment of front cantilever 14 - fourth segment of rear cantilever 13. The construction sequence of the fourth segment of the front cantilever 14 is as follows: the corresponding rear segment of the rear cantilever 13 and the rear segment of the front cantilever 14 are pulled together by the tie cable 7. The construction of the tie cable 7 is as follows: when the third segment of the front cantilever 14 is completed, the third segment of the rear cantilever 13 and the third segment of the front cantilever 14 are pulled together by the tie cable 7. When the fourth segment of the front cantilever 14 is completed, the fourth segment of the rear cantilever 13 and the fourth segment of the front cantilever 14 are pulled together by the tie cable 7. Finally, the cable is released.

[0073] Additionally, refer to Figure 10 A second temporary cross brace 8 is welded and installed between the fourth segments of the two front cantilever arms 14.

[0074] S50: Hoist the rear beam to the position between the last segments of the two rear cantilever 13, weld the rear beam to the rear cantilever 13, and then release the cable hook.

[0075] In S40-S50, the method also includes the following before the cable is released:

[0076] Remove the temporary guy rope 4 that is bound in S20-S30, and then bind the temporary guy rope 4 to the sections installed in S40-S50 in sequence.

[0077] S60: Triangular support blocks 18 are welded to the end of the rear cantilever 13 away from the steel-concrete joint section 12 and the end of the front cantilever 14 away from the steel-concrete joint section 12.

[0078] S70: Reference Figure 11 The side main beams 15 at the top two sides of the Y-shaped steel structure unit 1 are installed section by section from the rear cantilever 13 toward the front cantilever 14 until they are erected at the cable-stayed tower 3.

[0079] S80: Reference Figure 12 A permanent tie rod 17 is installed between the tail end of the rear cantilever 13 and the tail end of the front cantilever 14.

[0080] S90: Remove the tie cable 7 between the rear segment of the rear cantilever 13 and the rear segment of the front cantilever 14.

[0081] S100: Continue laying the side main beams 15 until a complete Y-shaped steel structure unit 1 is formed.

[0082] During the process of laying the side main beam 15: after each side main beam 15 is laid, a connecting beam is installed between the side main beams 15 at the top two sides of the Y-shaped steel structure unit 1 to form a truss.

[0083] Reference Figure 12 and Figure 13 The cable-stayed tower 3 includes a tower body 31 and several support rods 32. The tower body 31 is vertically arranged, and the bottom of the tower body 31 is fixedly installed in the steel-concrete composite section 12. A row of sliding grooves 311 is opened on both sides of the top of the tower body 31, and the two rows of sliding grooves 311 are arranged one-to-one. A support rod 32 is slidably installed in each sliding groove 311. The support rod 32 slides in the vertical direction, and the top of the support rod 32 abuts against the side main beam 15. The tower body 31 is equipped with a limiting component 9 for limiting the sliding position of the support rod 32.

[0084] The limiting assembly 9 includes a sliding sleeve 91 and a two-way cylinder 92. Each support rod 32 is fitted with a sliding sleeve 91, and the two corresponding sliding sleeves 91 are slidably installed on the tower body 31 in a direction that moves closer or further away from each other. On the side of the corresponding pair of support rods 32 that moves away from each other, there is a locking groove 321 for the inner wall of the sliding sleeve 91 to be engaged. A two-way cylinder 92 is fixedly installed between the two sliding sleeves 91 of the two corresponding support rods 32 on the tower body 31. The two piston rods of the two-way cylinder 92 are fixedly installed on the two corresponding sliding sleeves 91 respectively. Thus, the two sliding sleeves 91 of the same pair can be driven to slide in a direction that moves closer to each other, so that the sliding sleeves 91 leave the locking groove 321, and the top of the support rod 32 leaves the side main beam 15, thereby facilitating the removal of the entire cable-stayed tower 3.

[0085] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An installation method for an asymmetric spatial linear Y-shaped steel structure, characterized in that, The asymmetric spatial linear Y-shaped steel structure includes a pair of interlocking Y-shaped steel structure units (1); each Y-shaped steel structure unit (1) includes: a main tower (11), a steel-concrete composite section (12), a rear cantilever (13), a front cantilever (14), and a side main beam (15). The steel-concrete composite section (12) is located at the top of the main tower (11). The rear cantilever (13) and the front cantilever (14) are respectively welded to both sides of the steel-concrete composite section (12). The angle between the arm (13) and the main tower (11) is smaller than the angle between the front cantilever (14) and the main tower (11); the side main beam (15) is erected between the rear cantilever (13) and the front cantilever (14); a middle cross beam (16) is connected between the steel-concrete composite sections (12) in the two Y-shaped steel structure units (1); a rear end beam is installed between the tail ends of the two rear cantilever (13), and the side main beam (15) is connected to the rear end beam; Both the rear cantilever and the front cantilever (14) include several segments, and adjacent segments are welded together. The installation method includes: Step 1: Build a Y-shaped support (2) at the rear of the two rear cantilever (13) and build a cable-stayed tower (3) on the two steel-concrete composite sections (12); Step 2: Hoist the first segment of the rear cantilever (13) to the steel-concrete composite section (12), and weld the first segment of the rear cantilever (13) to the steel-concrete composite section (12). Hang the first segment of the rear cantilever (13) on the cable-stayed tower (3) through the cable (6), and then release the cable hooks. Complete the construction of the first segment of the front cantilever (14) using the above method. Step 3: Using the method in Step 2, construct the rear cantilever (13) to the position in front of the corresponding Y-shaped support (2); Step 4: The rear segments of the rear cantilever (13) are sequentially hoisted onto the Y-shaped support (2) to complete the welding construction. The same number of the rear segments of the front cantilever (14) are hoisted to the corresponding positions to complete the welding construction. The corresponding rear segments of the rear cantilever (13) and the rear segments of the front cantilever (14) are pulled together by the tie cables (7), and then the cables are released. Step 5: Hoist the rear end beam to the position between the last segments of the two rear cantilever arms (13), weld the rear end beam to the rear cantilever arms (13), and then release the cable hooks; Step 6: Install the side main beams (15) on both sides of the top of the Y-shaped steel structure unit (1) in sequence from the rear cantilever (13) toward the front cantilever (14) until a complete Y-shaped steel structure unit (1) is formed.

2. The method for installing an asymmetric spatial linear Y-shaped steel structure according to claim 1, characterized in that, In steps two and three, before the cable is released, the method further includes: Temporary guy ropes (4) are tied to both sides of each segment, with one temporary guy rope (4) tied to the ground and the other temporary guy rope (4) tied to the middle crossbeam (16). In steps four and five, before the cable is released, the method further includes: Remove the temporary guy rope (4) that was bound in steps two and three, and bind the temporary guy rope (4) to the segment installed in steps four and five.

3. The method for installing an asymmetric spatial linear Y-shaped steel structure according to claim 1, characterized in that, The specific methods for step six include: Install the side main beams (15) on both sides of the top of the Y-shaped steel structure unit (1) section by section from the rear cantilever (13) toward the front cantilever (14) until they are erected at the cable-stayed tower (3); A side span permanent tie rod (17) is installed between the tail end of the rear cantilever (13) and the tail end of the front cantilever (14); Remove the tie cable (7) between the rear segment of the rear cantilever (13) and the rear segment of the front cantilever (14); Continue laying the side main beams (15) until a complete Y-shaped steel structure unit (1) is formed.

4. The method for installing an asymmetric spatial linear Y-shaped steel structure according to claim 3, characterized in that, After step five and before step six, the method includes: Triangular support blocks (18) are welded to both the end of the rear cantilever (13) away from the steel-concrete composite section (12) and the end of the front cantilever (14) away from the steel-concrete composite section (12).

5. The method for installing an asymmetric spatial linear Y-shaped steel structure according to claim 3, characterized in that, For each section of the side main beam (15) laid, a connecting beam is installed between the side main beams (15) at the top two sides of the Y-shaped steel structure unit (1) to form a truss.

6. The method for installing an asymmetric spatial linear Y-shaped steel structure according to claim 1, characterized in that, After step three and before step four, a first temporary cross brace (5) is installed between the two rear cantilever arms (13) and between the two front cantilever arms (14); after step four and before step five, a second temporary cross brace (8) is installed between the two front cantilever arms (14) at the end away from the steel-concrete composite section (12).

7. The method for installing an asymmetric spatial linear Y-shaped steel structure according to claim 3, characterized in that, The cable-stayed tower (3) includes: a tower body (31) and several support rods (32). The tower body (31) is installed on the steel-concrete composite section (12). Several sliding grooves (311) are provided at the top of the tower body (31). Several support rods (32) are slidably installed on the tower body (31) through the sliding grooves (311). The support rods (32) are used to abut against the side main beam (15). The tower body (31) is equipped with a limiting component (9) for limiting the sliding position of the support rods (32).

8. The method for installing an asymmetric spatial linear Y-shaped steel structure according to claim 7, characterized in that, The support rods (32) are arranged in two rows and are located on both sides of the tower body (31). The support rods (32) on both sides are arranged in a one-to-one correspondence. The limiting component (9) includes: a sliding sleeve (91) and a two-way cylinder (92). Each support rod (32) is fitted with a sliding sleeve (91). The sliding sleeves (91) are slidably installed on the tower body (31). On the side of a pair of support rods (32) that are far apart from each other, there is a locking groove (321) for the inner wall of the sliding sleeve (91) to be inserted. A two-way cylinder (92) is installed between the two sliding sleeves (91) of the two support rods (32). The two piston rods of the two-way cylinder (92) are respectively connected to the two corresponding sliding sleeves (91).

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