Construction method of steel box girder installation system of long-span steel box tied arch bridge

Abstract

The application relates to a construction method of a large-span steel box tied-arch bridge steel box girder installation system, which comprises the following steps: S00, concrete enlarged foundation pouring; S10, steel box girder support erection; S20, anti-collision pile driving; S30, bearing platform top transverse beam support installation; S40, steel pipe support erection; S50, side box girder hoisting; S60, steel transverse beam installation; and S70, integral beam falling: placing numerical control hydraulic jacks at the rear part of a main bridge bearing platform, lifting the steel box girder and the steel transverse beam at the upper part, and making the end steel box girder and the steel transverse beam fall on the main bridge bearing platform by operating the numerical control hydraulic jacks. The application can provide various convenient construction structures and accelerate construction efficiency.

Description

Technical Field

[0001] This application relates to the field of building engineering technology, specifically to a construction method for the installation system of steel box girders in a long-span steel box tied arch bridge. Background Technology

[0002] Long-span steel box girder arch bridges are steel structure bridges used when the span is large. Their advantages include lightweight structure, good rigidity, and strong adaptability. However, there are some key and difficult points that require special attention during their installation and construction.

[0003] The installation of the crossbeams of the steel box girder is a key issue. The crossbeams of the steel box girder serve to laterally restrain and coordinate the rigid beam assembly composed of the steel box girders, ensuring the stability of the entire bridge. However, due to the large volume, heavy weight, and high rigidity of the steel box girders, and the limited space on the construction site, the installation of the crossbeams is quite difficult. Proper lifting, fixing, and adjustment operations are required to ensure a firm and reliable connection between the crossbeams and the steel box girders, meeting construction and usage requirements.

[0004] Furthermore, lowering the beams is a significant construction challenge. During this process, coordination of lifting, transportation, and placement is crucial to ensure the beams are not damaged, while also guaranteeing the accuracy and stability of the lowering. In practice, careful control of parameters such as the beam's position, direction, and height is essential, employing appropriate adjustments and support measures to prevent beam deformation or tilting, thereby ensuring the overall stability and safety of the bridge.

[0005] Therefore, there is an urgent need for a construction method for the installation system of steel box girders in large-span steel box tied arch bridges, which can provide a variety of convenient construction structures for the installation of steel box girders in large-span steel box tied arch bridges, improve the efficiency of the installation of crossbeams and the lowering of the steel box girders, and at the same time ensure the stability of the steel box supports, thus having good technical benefits.

[0006] Application content

[0007] The purpose of this application is to address the aforementioned problems in the prior art by providing a construction method for the installation system of steel box girders for long-span steel box tied arch bridges.

[0008] To achieve the aforementioned objectives, this application adopts the following technical solution: The construction method for the steel box girder installation system of a long-span steel box tied arch bridge includes the following steps:

[0009] S00, Concrete spread foundation pouring: The grouting steel pipe is driven into the soil layer through the steel base plate, and the driving depth must exceed the weak soil layer and reach the bearing soil layer.

[0010] Cement slurry is injected into the grouting steel pipe, with a steel base plate as the bottom template and side templates installed at both ends and fixed by tie rods and bolts.

[0011] Diagonal bracing is installed between the side formwork and the ground. Concrete is poured into the formwork space and forms a concrete foundation after it sets.

[0012] S10. Steel box girder support erection: pour ground anchor foundation, embed ground anchor into ground anchor foundation, and install clamp fastening device on steel pipe on steel pipe support;

[0013] The inner pre-drilled hole on the clamp ring is fixed with clamp ring fixing bolts, and the outer pre-drilled hole is connected to the steel strand. The other end of the steel strand is connected to the ground anchor. The steel strand is tensioned so that both sides of the steel pipe support bear the same tensile force.

[0014] S20. Installation of anti-collision piles: Two rows of anti-collision steel pipe piles are driven into the bearing soil layer. The two rows of anti-collision steel pipe piles are connected by welding steel pipe pile connecting vertical rods and steel pipe pile connecting diagonal rods.

[0015] S30. Installation of crossbeam at the end of the pier: Anchor the inverted U-shaped steel plate to the concrete foundation with anchor bolts, and weld a reinforcing steel plate between the lower part of the crossbeam support steel pipe at the top of the pier and the inverted U-shaped steel plate.

[0016] S40. Steel box girder installation: Erect steel pipe supports and weld circular steel plates to both ends of the spiral steel pipes of the steel pipe supports;

[0017] The prestressed anchor cable is passed through the circular steel plates at both ends of the spiral steel pipe. After the prestress is applied to the prestressed anchor cable, it is anchored by the anchor, so that the entire steel pipe support is vertically subjected to the tension of the prestressed anchor cable.

[0018] S50, Side Box Girder Lifting: An adjusting and stabilizing support is set on the top of the steel pipe support. The side box girder segment is lifted to the top of the steel pipe support. The height of the movable steel section is adjusted by adjusting the knob to control the extension and retraction of the adjusting bolt, thereby driving the horizontal adjustment of the side box girder segment.

[0019] S60, Steel crossbeam installation: Weld the diagonal braces, horizontal braces, and vertical braces of the operating platform to form the platform frame;

[0020] The steel plate of the operating platform is welded to the crossbar of the operating platform at the bottom of the platform frame, and the two ends of the platform frame are welded and fixed to the steel pipe support.

[0021] The crane slings are used to lift the steel beam via hooks for hoisting operations.

[0022] S70. Overall beam lowering: Place the CNC hydraulic jacks at the rear of the main bridge abutment, lift the steel box girder and steel crossbeams from above, and lower the end steel box girder and steel crossbeams onto the main bridge abutment by operating the CNC hydraulic jacks.

[0023] Furthermore, in step S00, a steel pipe hole is provided on the steel base plate, and the grouting steel pipe passes through the steel base plate and is driven into the soil layer through the steel pipe hole.

[0024] Furthermore, in step S50, the adjusting and stabilizing bracket is set on top of the steel pipe support. An I-beam is welded to the end of the steel pipe at the top of the steel pipe support. An adjusting bolt is embedded in the I-beam. The other end of the adjusting bolt 3 is connected to the movable steel section. There is an adjusting knob on the adjusting bolt. The adjusting bolt is extended and retracted by adjusting the knob to adjust the height of the movable steel section.

[0025] Furthermore, in step S20, steel pipe piles are welded together to form crossbars for the anti-collision steel pipe piles near the steel box girder support, while the anti-collision steel pipe piles away from the steel box girder support are connected by two flexible steel cables.

[0026] Furthermore, in step S60, workers assist with hoisting and welding operations by standing on the steel plate of the operating platform.

[0027] Furthermore, the CNC hydraulic jacks are wired to the CNC system, and the CNC system operates the hydraulic jacks to lower them synchronously, so that the end steel box girders and steel crossbeams fall onto the main bridge abutment.

[0028] Compared with the prior art, this application has the following beneficial effects:

[0029] 1. The structure involved in this application can solve the problems of steel box girder cross tie beam installation and beam lowering construction in the construction of steel box girder of large-span steel box tied arch bridge, and has good technical benefits; this application adopts anchored concrete enlarged foundation, which improves the stability of steel pipe support; this application adopts a guy rope restraint system in the support installation process, which solves the problem of difficult steel pipe installation and welding caused by wind force during the support installation process.

[0030] 2. This application adopts a technology to prevent horizontal impact, and solves the problem of safety hazards caused by the steel pipe support being easily impacted by external forces during bridge construction by using flexible steel cable buffer; this application adopts a crossbeam support structure at the top of the main bridge abutment, which solves the problem of the bottom of the end crossbeam support being difficult to stabilize and improves the stability of the support structure; this application adopts a temporary steel support structure, and improves the vertical structural stability of the steel pipe support by using prestressed anchoring tension.

[0031] 3. This application adopts side box girder hoisting technology, which solves the problem of difficulty in adjusting the level during side box girder hoisting; adopts crossbeam hoisting technology, which solves the problem of difficulty in high-altitude operation and insufficient working space for workers during crossbeam hoisting construction; and adopts integral beam lowering technology, which solves the problem of simultaneous overall lowering of steel box girders. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of an anchored concrete enlarged foundation structure;

[0033] Figure 2 This is a schematic diagram of the formwork device for anchoring concrete enlarged foundations;

[0034] Figure 3 This is a schematic diagram of the guy rope constraint system structure;

[0035] Figure 4 yes Figure 3 Enlarged view of the circle on the left;

[0036] Figure 5 yes Figure 3 Enlarged view of the circle on the right;

[0037] Figure 6 This is a diagram showing the layout of technologies to prevent horizontal impacts.

[0038] Figure 7 This is a top view of a technology to prevent horizontal impacts.

[0039] Figure 8 This is a side view of a steel-based technology for preventing horizontal impacts.

[0040] Figure 9 This is a schematic diagram of a flexible anti-collision pile structure;

[0041] Figure 10 This is a side view of a flexible crash barrier structure;

[0042] Figure 11 This is a top view of a flexible crash barrier structure;

[0043] Figure 12 This is a schematic diagram of the crossbeam support structure at the top of the main bridge abutment;

[0044] Figure 13 yes Figure 12 Enlarged image within the circle;

[0045] Figure 14 This is a side view of the crossbeam support structure at the top of the main bridge abutment;

[0046] Figure 15 yes Figure 14 Enlarged image within the circle;

[0047] Figure 16 This is a schematic diagram of a temporary steel support structure;

[0048] Figure 17 yes Figure 16 Enlarged image within the circle;

[0049] Figure 18 This is a top view of the steel pipes of the temporary steel structure support;

[0050] Figure 19 This is a schematic diagram of the side box girder hoisting technology.

[0051] Figure 20 yes Figure 19 Enlarged image within the circle;

[0052] Figure 21 This is a schematic diagram of the side box girder hoisting technology construction;

[0053] Figure 22 This is a schematic diagram of the beam hoisting technology structure;

[0054] Figure 23 yes Figure 22 Enlarged diagram within the circle;

[0055] Figure 24 This is a schematic diagram of the overall beam-dropping technology structure;

[0056] Figure 25 This is the construction flowchart of this application.

[0057] In the diagram, 1. Grouting steel pipe; 2. Steel base plate; 3. Concrete foundation; 4. Soft soil layer; 5. Bearing soil layer; 6. Tie rod; 7. Side formwork; 8. Bolt; 9. Diagonal brace; 10. Cement grout; 11. Ground anchor; 12. Steel strand; 13. Ground anchor foundation; 14. Hoop fixing bolt; 15. Reserved hole; 17. Anti-collision steel pipe pile; 18. Steel pipe pile connecting vertical rod; 19. Steel pipe pile connecting diagonal rod; 20. Flexible steel cable; 21. Steel box girder; 22. Steel crossbeam; 23. Steel pipe pile connecting horizontal rod. 24. Reinforcing steel plate; 25. Inverted U-shaped steel plate; 26. Anchor bolt; 27. Anchorage; 28. Circular steel plate; 29. ​​Prestressed anchor cable; 30. Spiral steel pipe; 31. Movable steel section; 32. Adjusting bolt; 33. Adjusting knob; 34. I-beam; 35. Hook; 36. Lifting sling; 37. Diagonal bar of operating platform; 38. Horizontal bar of operating platform; 39. Steel plate of operating platform; 40. Vertical bar of operating platform; 41. CNC hydraulic jack; 42. Main bridge abutment; 43. CNC system; 44. Clamping ring. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0059] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., 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 application 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, the above terms should not be construed as limitations on this application.

[0060] like Figure 1-2 An anchored concrete enlarged foundation is provided with steel pipe holes on a steel base plate 2. A grouting steel pipe 1 is driven into the soil layer through the steel base plate 2, and the driving depth must exceed the weak soil layer 4 to reach the bearing soil layer 5. The grouting steel pipe 1 contains cement paste 10. The steel base plate 2 is used as the bottom template, and side templates 7 are installed at both ends and fixed by tie rods 6 and bolts 8. Diagonal bracing 9 is set between the side templates 7 and the ground. Concrete is poured into the template space and forms a concrete foundation 3 after solidification.

[0061] like Figure 3-5 A guy rope restraint system for the installation process of a support frame, wherein the ground anchor 11 is embedded in the ground anchor foundation 13, and the steel pipe on the steel pipe support is provided with a clamp fastening device, which consists of a pair of clamp rings 44. The clamp rings 44 are provided with two sets of four reserved holes 15 at both ends. The inner reserved hole 15 is fixed by the clamp ring fixing bolt 14, and the outer reserved hole 15 is connected to the steel strand 12. The other end of the steel strand 12 is connected to the ground anchor 11.

[0062] like Figure 6-11 A technology to prevent horizontal impact forces involves driving two rows of anti-collision steel pipe piles 17 into the bearing soil layer. The two rows of anti-collision steel pipe piles 17 are connected by steel pipe pile connecting vertical rods 18 and steel pipe pile connecting diagonal rods 19. The anti-collision steel pipe piles 17 on the side closer to the support are connected by steel pipe pile connecting horizontal rods 23, while the anti-collision steel pipe piles 17 on the side farther from the support are connected by two flexible steel cables 20.

[0063] like Figure 12-15 A type of main bridge pier top beam support, wherein a concrete foundation 3 is provided at the bottom of the pier top beam support, and an inverted U-shaped steel plate 25 is anchored to the concrete foundation by anchor bolts 26. The lower part of the steel pipe of the pier top beam support and the inverted U-shaped steel plate 25 are welded together by reinforcing steel plate 24.

[0064] like Figure 16-18 A temporary steel structure support is provided, which is composed of steel pipes and I-beams. Circular steel plates 28 are provided at both ends of the steel pipes (spiral steel pipes 30). Prestressed anchor cable holes are provided on the circular steel plates 28. The prestressed anchor cables 29 pass through the circular steel plates 28 at both ends of the steel pipes of the steel pipe support. After applying prestress to the prestressed anchor cables 29, they are anchored by anchors 27.

[0065] like Figure 19-21 A side box girder hoisting technology involves adjusting and stabilizing the support set on top of a steel pipe support. An I-beam 34 is welded to the end of the steel pipe at the top of the support. An adjusting bolt 32 is embedded in the I-beam 34. The other end of the adjusting bolt 32 is connected to a movable steel section 31. An adjusting knob 33 is on the adjusting bolt 32. The adjusting knob 33 controls the extension and retraction of the adjusting bolt 32 to adjust the height of the movable steel section 31.

[0066] like Figure 22-23 A beam hoisting technology is described, in which the operating platform diagonal bar 37, operating platform horizontal bar 38, and operating platform vertical bar 40 are welded to form a platform frame, and the operating platform steel plate 39 is welded to the operating platform horizontal bar 38 at the bottom of the platform frame. The two ends of the platform frame are welded and fixed to the steel pipe support. During construction, the crane sling 36 is used to lift the steel beam 22 through the hook 35, and workers stand on the operating platform steel plate 39 to assist in the hoisting and welding operations.

[0067] like Figure 24 A method for lowering a beam as a whole involves placing a CNC hydraulic jack 41 at the rear of the main bridge abutment 42, which lifts the steel box girder 21 and the steel crossbeam 22. The CNC hydraulic jack 41 is wired to a CNC system 43, which lowers the CNC hydraulic jack 41 synchronously, so that the end steel box girder 21 and the steel crossbeam 22 fall onto the main bridge abutment.

[0068] like Figure 25 As shown, the construction method for the steel box girder installation system of this large-span steel box tied arch bridge includes the following steps:

[0069] S00, Concrete spread foundation pouring: The grouting steel pipe 1 is driven into the soil layer through the steel base plate 2, and the driving depth must exceed the weak soil layer 4 and reach the bearing soil layer 5.

[0070] Cement grout 10 is injected into the grouting steel pipe 1. The steel base plate 2 is used as the bottom template, and side templates 7 are installed at both ends and fixed by tie rods 6 and bolts 8.

[0071] Diagonal bracing 9 is installed between the side formwork 7 and the ground. Concrete is poured into the formwork space and solidifies to form a concrete foundation 3.

[0072] In this embodiment, a steel pipe hole is provided on the steel base plate 2, and the grouting steel pipe 1 passes through the steel base plate 2 and is driven into the soil layer.

[0073] S10, Steel box girder 21 support erection: pour ground anchor foundation 13, embed ground anchor 11 on ground anchor foundation 13, and install clamp fastening device on steel pipe on steel pipe support;

[0074] The inner pre-drilled hole 15 on the clamp ring 44 is fixed with clamp ring fixing bolt 14, and the outer pre-drilled hole 15 is connected to the steel strand 12. The other end of the steel strand 12 is connected to the ground anchor 11. The steel strand 12 is tensioned so that both sides of the steel pipe support bear the same tensile force.

[0075] S20, Installation of anti-collision piles: Two rows of anti-collision steel pipe piles 17 are driven into the bearing soil layer 5. The two rows of anti-collision steel pipe piles 17 are connected by steel pipe pile connecting vertical rods 18 and steel pipe pile connecting diagonal rods 19.

[0076] In this embodiment, steel pipe piles 17 near the support side of the steel box girder 21 are connected by welded steel pipe pile connecting crossbars 23, while the anti-collision steel pipe piles 17 away from the support side of the steel box girder 21 are connected by two flexible steel cables 20.

[0077] S30. Installation of the crossbeam at the end of the pier: Anchor the inverted U-shaped steel plate 25 to the concrete foundation 3 with anchor bolts 26, and weld the reinforcing steel plate 24 between the lower part of the crossbeam support steel pipe at the top of the pier and the inverted U-shaped steel plate 25.

[0078] S40, Steel Box Girder 21 Installation: Erect steel pipe supports and weld circular steel plates 28 to both ends of the spiral steel pipe 30 of the steel pipe supports;

[0079] The prestressed anchor cable 29 is passed through the circular steel plates 28 at both ends of the spiral steel pipe 30. After the prestress is applied to the prestressed anchor cable 29, it is anchored by the anchor 27, so that the entire steel pipe support is subjected to the tension of the prestressed anchor cable 29 vertically.

[0080] S50, Side Box Girder Lifting: An adjusting and stabilizing support is set on the top of the steel pipe support. The side box girder segment is lifted to the top of the steel pipe support. The height of the movable steel 31 is adjusted by adjusting the extension and retraction of the adjusting bolt 32 through the adjusting knob 33, which drives the side box girder segment to adjust horizontally.

[0081] In this embodiment, the adjusting and stabilizing bracket is set on the top of the steel pipe support. An I-beam 34 is welded to the end of the steel pipe at the top of the steel pipe support. An adjusting bolt 32 is embedded on the I-beam 34. The other end of the adjusting bolt 32 is connected to the movable steel section 31. An adjusting knob 33 is on the adjusting bolt 32. The adjusting bolt 32 is extended and retracted by adjusting the knob 33 to adjust the height of the movable steel section 31.

[0082] S60, Steel crossbeam 22 installation: Weld the diagonal brace 37, horizontal brace 38, and vertical brace 40 of the operating platform to form the platform frame;

[0083] The operating platform steel plate 39 is welded to the operating platform crossbar 38 at the bottom of the platform frame, and the two ends of the platform frame are welded and fixed to the steel pipe support.

[0084] The crane sling 36 is used to lift the steel beam 22 via the hook 35 for hoisting operation;

[0085] In this embodiment, workers assist in hoisting and welding operations by standing on the steel plate 39 of the operating platform.

[0086] S70, Overall beam lowering: Place the CNC hydraulic jack 41 at the rear of the main bridge abutment 42, lift the steel box girder 21 and steel crossbeam 22 from the top, and lower the end steel box girder 21 and steel crossbeam 22 onto the main bridge abutment 42 by operating the CNC hydraulic jack 41.

[0087] In this embodiment, the CNC hydraulic jack 41 is wired to the CNC system 43. The CNC system 43 operates the hydraulic jack 41 to lower the CNC hydraulic jack 41 synchronously, so that the end steel box girder 21 and steel crossbeam 22 fall on the main bridge abutment 42.

[0088] The parts not described in detail in this application are prior art, and therefore are not described in detail in this application.

[0089] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0090] Although this document uses a significant amount of technical terminology, the possibility of using other terms is not excluded. These terms are used merely to facilitate the description and explanation of the nature of this application; interpreting them as any additional limitation would be contrary to the spirit of this application.

[0091] This application is not limited to the above-described preferred embodiments. Anyone can derive other products in various forms under the guidance of this application. However, regardless of any changes made to their shape or structure, any technical solution that is the same as or similar to that of this application falls within the protection scope of this application.

Claims

1. A construction method for the installation system of steel box girders in a long-span steel box tied arch bridge, characterized in that, Includes the following steps: S00, Concrete enlarged foundation pouring: The grouting steel pipe (1) is driven into the soil layer through the steel base plate (2), and the driving depth must exceed the weak soil layer (4) to reach the bearing soil layer (5). Cement slurry (10) is injected into the grouting steel pipe (1), with the steel base plate (2) as the bottom template, and side templates (7) are installed at both ends and fixed by tie rods (6) and bolts (8); Diagonal bracing (9) is installed between the side formwork (7) and the ground. Concrete is poured into the formwork space and solidifies to form a concrete foundation (3). S10, Steel box girder (21) support erection: pour ground anchor foundation (13), embed ground anchor (11) on ground anchor foundation (13), install clamp fastening device on steel pipe on steel pipe support; The inner reserved hole (15) on the clamp ring (44) is fixed with clamp ring fixing bolt (14), and the outer reserved hole (15) is connected to the steel strand (12). The other end of the steel strand (12) is connected to the ground anchor (11). The steel strand (12) is tensioned so that both sides of the steel pipe support bear the same tension. S20, Anti-collision pile installation: Two rows of anti-collision steel pipe piles (17) are driven into the bearing soil layer (5). The two rows of anti-collision steel pipe piles (17) are connected by steel pipe pile connecting vertical rods (18) and steel pipe pile connecting diagonal rods (19). S30, Installation of the top beam support of the pier: Anchor the inverted U-shaped steel plate (25) to the concrete foundation (3) with anchor bolts (26), and weld the reinforcing steel plate (24) between the lower part of the steel pipe of the top beam support of the pier and the inverted U-shaped steel plate (25). S40. Erecting steel pipe supports: Weld circular steel plates (28) to both ends of the spiral steel pipe (30) of the steel pipe support. The prestressed anchor cable (29) is passed through the circular steel plates (28) at both ends of the spiral steel pipe (30). After the prestress is applied to the prestressed anchor cable (29), it is anchored by the anchor (27), so that the entire steel pipe support is subjected to the tension of the prestressed anchor cable (29) in the vertical direction. S50, Side box girder hoisting: Set up an adjustment and stabilization support on the top of the steel pipe support, hoist the side box girder segment to the top of the steel pipe support, and adjust the height of the movable steel (31) by adjusting the knob (33) to control the extension and retraction of the adjusting bolt (32) to drive the horizontal adjustment of the side box girder segment; S60, Steel crossbeam (22) installation: Weld the diagonal rod (37), horizontal rod (38), and vertical rod (40) of the operating platform to form the platform frame; The operating platform steel plate (39) is welded to the operating platform crossbar (38) at the bottom of the platform frame, and the two ends of the platform frame are welded and fixed to the steel pipe support; The steel beam (22) is lifted by the crane sling (36) through the hook (35) for hoisting operation; S70, Overall beam lowering: Place the CNC hydraulic jack (41) at the rear of the main bridge abutment (42), lift the steel box girder (21) and steel crossbeam (22) from the top, and lower the end steel box girder (21) and steel crossbeam (22) onto the main bridge abutment (42) by operating the CNC hydraulic jack (41).

2. The construction method for the steel box girder installation system of a long-span steel box tied arch bridge according to claim 1, characterized in that, In step S00, a steel pipe hole is provided on the steel base plate (2), and the grouting steel pipe (1) passes through the steel pipe hole and is driven into the soil layer through the steel base plate (2).

3. The construction method for the steel box girder installation system of a long-span steel box tied arch bridge according to claim 1, characterized in that, In step S50, the adjustment and stabilization bracket is set on the top of the steel pipe bracket. An I-beam (34) is welded to the end of the steel pipe at the top of the steel pipe bracket. An adjustment bolt (32) is embedded on the I-beam (34). The other end of the adjustment bolt (32) is connected to the movable steel section (31). An adjustment knob (33) is on the adjustment bolt (32). The adjustment bolt (32) is extended and retracted by the adjustment knob (33) to realize the height adjustment of the movable steel section (31).

4. The construction method for the steel box girder installation system of a long-span steel box tied arch bridge according to any one of claims 1-3, characterized in that, In step S20, steel pipe pile connecting crossbars (23) are welded between the anti-collision steel pipe piles (17) close to the support side of the steel box girder (21), and two flexible steel cables (20) are used to connect the anti-collision steel pipe piles (17) far away from the support side of the steel box girder (21).

5. The construction method for the steel box girder installation system of a long-span steel box tied arch bridge according to any one of claims 1-3, characterized in that, In step S60, workers assist with hoisting and welding operations by standing on the steel plate (39) of the operating platform.

6. The construction method for the steel box girder installation system of a long-span steel box tied arch bridge according to any one of claims 1-3, characterized in that, In step S70, the CNC hydraulic jack (41) is connected to the CNC system (43) by wire. The CNC system (43) operates to lower the CNC hydraulic jack (41) synchronously, so that the end steel box girder (21) and steel crossbeam (22) fall on the main bridge abutment (42).

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