Construction method of large-span cantilever steel structure

Abstract

The application discloses a large-span cantilever steel structure construction method and belongs to the technical field of building construction, which comprises the following steps: 1) bottom concrete structure pouring; 2) temporary support device installation; 3) large-span cantilever steel structure installation; 4) pouring: pouring the remaining concrete structure; and 5) temporary support device adjustment. The method aims at solving the problem that the force exerted by the temporary support device cannot be adjusted during the construction of the large-span cantilever steel structure.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a construction method for large-span cantilever steel structures. Background Technology

[0002] With the continuous development of building technology, the shapes and functions of buildings are becoming increasingly diverse; among them, large-span cantilever steel structures are widely used as roofs in the design of large stadiums. Existing large-span cantilever steel structures typically consist of a core tube and cantilever sections. Since the cantilever lengths at both ends of a large-span cantilever structure are generally different, temporary supports are often required during the construction of the cantilever structure. However, when the large-span cantilever steel structure deforms due to the force applied by the temporary support devices during construction, the existing temporary support devices cannot be adjusted, thus failing to help the large-span cantilever structure recover from deformation or prevent further deformation. Summary of the Invention

[0003] In view of this, the present invention discloses a construction method for a large-span cantilever steel structure, the purpose of which is to solve the problem that the force applied by the temporary support device cannot be adjusted during the construction of a large-span cantilever steel structure.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A construction method for a large-span cantilever steel structure includes the following steps:

[0006] 1) Bottom concrete structure pouring: Lay out the formwork and pour the lower core tube on the ground; and pour concrete beams that connect to the ground on the side wall of the lower core tube;

[0007] 2) Installation of temporary support device: The temporary support device includes a tension structure installed on the concrete beam, which is used to pull the short end of the long-span cantilever steel structure; the temporary support device also includes a support structure installed on the ground, which is used to support the long end of the long-span cantilever steel structure.

[0008] 3) Installation of large-span cantilever steel structure: The steel core tube of the large-span cantilever steel structure is hoisted onto the lower core tube, and the remaining steel structure is installed in sections. During this process, a support structure is used to support the large-span cantilever steel structure. After the large-span cantilever steel structure is installed, the short end of the large-span cantilever steel structure is pulled by a traction structure, and the support structure is removed.

[0009] 4) Pouring: Pouring the remaining concrete structure;

[0010] 5) Temporary support device adjustment: During construction, the force applied to the large-span cantilever steel structure by the temporary support device is adjusted according to the deformation trend of the large-span cantilever steel structure to prevent excessive deformation of the large-span cantilever steel structure.

[0011] Furthermore, a temporary support device involved in a construction method for a large-span cantilever steel structure includes a tension structure and a support structure. The tension structure includes a connecting seat mounted on a concrete beam. Several vertically arranged rotating shafts are rotatably connected to the connecting seat. A horizontally arranged guide rail is fixed to the top of each rotating shaft. A sliding seat is slidably connected to each guide rail. A traction seat is mounted on each sliding seat. A cable detachably connected to the large-span cantilever steel structure is mounted on the traction seat. An adjuster for regulating the tension of the cable is mounted on the traction seat. The support structure includes a base mounted on the ground. Several interconnected support sections are mounted on the base. The top support section has an mounting seat at its top. A hydraulic support device for supporting the large-span cantilever steel structure is mounted on the mounting seat. The magnitude and direction of the supporting force applied by the hydraulic support device are adjustable.

[0012] In this scheme, when the long end of the large-span cantilever steel structure is supported by a support structure, and the large-span cantilever steel structure deforms due to the support force, the magnitude and direction of the support force applied by the hydraulic support device are adjusted to prevent further deformation. When the short end of the large-span cantilever steel structure is pulled by a tensioning structure, and the large-span cantilever steel structure deforms due to the support force, the magnitude and direction of the tension cable need to be adjusted. The guide rail is rotated by a drive shaft, which drives the slide block to slide. The slide block moves the bottom end of the cable, thereby adjusting the direction of the traction force applied by the cable to the large-span cantilever steel structure. After locking the slide block and the guide rail, the tension cable is adjusted by an adjuster, thus completing the adjustment of the tensioning structure and preventing further deformation of the large-span cantilever steel structure.

[0013] Furthermore, the hydraulic support device includes a support base detachably connected to the large-span cantilever steel structure and hydraulic cylinders fixed in a circular array on the top of the mounting base; the bottom of the support base has several slide rails distributed in a circular array, the middle of the slide rails is rotatably connected to the bottom of the support base, and each slide rail is slidably connected to an adjusting seat, which is hinged to the end of the corresponding hydraulic cylinder; locking pins facing the support base are slidably provided at both ends of the slide rails, and elastic reset members are provided between the locking pins and the slide rails; the bottom of the support base has several locking holes that cooperate with the locking pins; the adjusting seats have identical locking pins on both sides, and elastic reset members are also provided between the locking pins and the corresponding connecting plates; the slide rails have locking holes that cooperate with the corresponding locking pins on both sides; first electromagnets for attracting the corresponding locking pins are provided at both ends of the slide rails and inside the adjusting seats.

[0014] When it is necessary to adjust the direction of the force applied by the hydraulic support structure, the deflection axis of the support seat is determined, ensuring that the slide rail and the first electromagnet on the slide block on the deflection axis remain de-energized. At this time, the other first electromagnets are energized, and the first electromagnets attract the corresponding locking pins, causing the locking pins to disengage from the corresponding locking holes, thereby allowing the corresponding slide rail to rotate relative to the support seat and the corresponding adjusting seat to slide relative to the slide rail. Then, the hydraulic cylinder on one side of the deflection axis is driven to shorten, and the hydraulic cylinder on the other side is driven to extend, causing the support seat to deflect at a certain angle along the deflection axis, thereby adjusting the direction of the support force applied by the support seat to the large-span cantilever steel structure. During this process, the hydraulic cylinder drives the adjusting seat to rotate the corresponding slide rail to be perpendicular to the deflection axis, and drives the adjusting seat to slide on the slide rail, thereby maintaining the connection and support relationship between the hydraulic cylinder, the adjusting seat and the slide rail. After the adjustment is completed, the hydraulic cylinder is closed and the first electromagnets are de-energized. The locking pin is inserted into the locking hole under the action of the elastic support, thereby locking the slide rail relative to the support seat and the adjusting seat relative to the slide rail, ensuring the support of the support seat.

[0015] Furthermore, the connecting seat has several sets of annular grooves coaxial with the corresponding rotating shafts. Each annular groove contains a coaxial annular block, the top of which is fixedly connected to the corresponding guide rail. Several limiting blocks are horizontally slidably connected to the inner and outer walls of each annular block. The sidewalls of the annular grooves have several limiting grooves corresponding to the limiting blocks. The inner walls of the guide rails have several identical limiting grooves on both sides. Identical limiting blocks are slidably connected to both sides of the slide block. Elastic support members are provided between the annular block and the corresponding limiting block, and between the slide block and the corresponding limiting block. Second electromagnets for attracting the corresponding limiting blocks are provided inside the annular block and on the slide block.

[0016] In this scheme, when it is necessary to adjust the direction of the force applied to the tension structure, the second electromagnet inside the annular block is energized. The second electromagnet attracts the limiting blocks on both sides of the annular block, causing them to disengage from the limiting groove. It then drives the guide rail to rotate via the drive shaft, making the guide rail parallel to the direction of the required force. At this time, the second electromagnet inside the annular block is de-energized, and the limiting blocks on both sides of the annular block are inserted into the limiting groove under the action of the elastic support, restricting the rotation of the annular block, thereby restricting the rotation of the guide rail. Then, the second electromagnet inside the slide block is energized, and the second electromagnet attracts the limiting blocks on both sides of the slide block, causing them to disengage from the limiting groove. At this time, the slide block is moved, causing the bottom and top ends of the cable to tilt, thereby changing the direction of the force applied by the cable to the short end of the long-span cantilever steel structure. After the adjustment is completed, the second electromagnet inside the slide block is de-energized, and the limiting blocks on both sides of the slide block are inserted into the limiting groove under the action of the elastic support, restricting the movement of the slide block.

[0017] Furthermore, the lower end of the mounting base is provided with a receiving groove for accommodating the support section, the depth of the receiving groove being greater than the height of the support section, and an opening for the support section to enter and exit is provided on the side wall of the mounting base. A truss extending out of the mounting base is horizontally fixed at the top of the receiving groove, and a hoisting device is slidably connected to the truss. An annular seat is provided at the lower end of the mounting base and fitted onto the support section. A hydraulic jacking device is provided between the annular seat and the mounting base, and the annular seat, the mounting base, and the support section are detachably connected.

[0018] In this scheme, after assembling the base mounting seat, the bottommost support section, and the mounting seat, the annular seat is fixed to the support section. A hydraulic jacking device is then used to lift the mounting seat, positioning it above the support section. At this point, hoisting equipment is used to lift the remaining support sections, and a sliding hoisting device is used to insert them into the mounting seat through the opening. The support sections are then placed on the bottom support section using the hoisting device, and adjacent support sections are secured with bolts. Next, the mounting seat is fixed to the previous support section, the connection between the annular seat and the support section is released, and the hydraulic jacking device moves the annular seat upwards onto the previous support section. The annular seat is then fixed to this support section, and the connection between the mounting seat and this support section is released. The mounting seat is then lifted using the hydraulic jacking device. This process is repeated until the hydraulic support structure at the top of the mounting seat contacts the large-span cantilever steel structure. This scheme makes the installation of the support structure more convenient, eliminating the need for additional lifting equipment.

[0019] Furthermore, each of the annular blocks is provided with an anti-pull-out ring on its periphery, and each of the annular groove sidewalls is provided with a mating groove corresponding to the anti-pull-out ring.

[0020] Furthermore, reinforcing ribs are fixed between the guide rail and the corresponding annular block.

[0021] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3This is a longitudinal sectional view of the tension structure in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0027] Figure 5 This is a longitudinal sectional view of the hydraulic support device in an embodiment of the present invention;

[0028] Figure 6 This is a longitudinal sectional view of the connection between the slide block and the slide rail in an embodiment of the present invention.

[0029] The following components are labeled in the attached diagram: 1. Lower core tube; 2. Concrete beam; 3. Large-span cantilever steel structure; 4. Connecting seat; 5. Rotating shaft; 6. Guide rail; 7. Slide seat; 8. Traction seat; 9. Cable; 10. Support section; 11. Mounting seat; 12. Support seat; 13. Ring block; 14. Limiting block; 15. Limiting groove; 16. Elastic support component; 17. Second electromagnet; 18. Truss; 19. Ring seat; 20. Hydraulic jacking device; 21. Anti-pull ring; 22. Base; 23. Hydraulic cylinder; 24. Slide rail; 25. Adjusting seat; 26. Locking pin; 27. First electromagnet; 28. Elastic reset component. Detailed Implementation

[0030] like Figures 1-6 As shown:

[0031] A construction method for a large-span cantilever steel structure includes the following steps:

[0032] 1) Bottom concrete structure pouring: Lay out the formwork and pour the lower core tube 1 on the ground; and pour the concrete beam 2 connected to the ground on the side wall of the lower core tube 1.

[0033] 2) Installation of temporary support device: The temporary support device includes a traction structure installed on the concrete beam 2, which is used to pull the short end of the long-span cantilever steel structure 3; the temporary support device also includes a support structure installed on the ground, which is used to support the long end of the long-span cantilever steel structure 3.

[0034] 3) Installation of the large-span cantilever steel structure 3: The steel core tube of the large-span cantilever steel structure 3 is hoisted onto the lower core tube 1, and the remaining steel structure is installed in sections. During this process, a support structure is used to support the large-span cantilever steel structure 3. After the large-span cantilever steel structure 3 is installed, the short end of the large-span cantilever steel structure 3 is pulled by a traction structure, and the support structure is removed.

[0035] 4) Pouring: Pouring the remaining concrete structure;

[0036] 5) Temporary support device adjustment: During construction, the force applied to the large-span cantilever steel structure 3 by the temporary support device is adjusted according to the deformation trend of the large-span cantilever steel structure 3 to prevent excessive deformation of the large-span cantilever steel structure 3.

[0037] In this embodiment, a temporary support device involved in the construction method of a large-span cantilever steel structure 3 includes a tension structure and a support structure. The tension structure includes a connecting seat 4 set on the concrete beam 2. Several vertically arranged rotating shafts 5 are rotatably connected to the connecting seat 4. In this embodiment, the rotation of the rotating shafts 5 is driven by a motor, which is a conventional technical means and therefore not shown in the figure. A horizontally arranged guide rail 6 is welded and fixed to the top of the rotating shaft 5. Each guide rail 6 is slidably connected to a sliding seat 7. In this embodiment, the sliding of the sliding seat 7 is pushed by a hydraulic cylinder 23, which is a conventional technical means and therefore not shown in the figure. Not shown; the sliding seat 7 is provided with a traction seat 8, the traction seat 8 is provided with a cable 9 that is detachably connected to the large-span cantilever steel structure 3, and the traction seat 8 is provided with an adjuster for adjusting the tension of the cable 9; the support structure includes a base 22 set on the ground, the base 22 is provided with several interconnected support sections 10, wherein the top support section 10 is provided with a mounting seat 11, the mounting seat 11 is provided with a hydraulic support device for supporting the large-span cantilever steel structure 3, and the magnitude and direction of the support force applied by the hydraulic support device are adjustable.

[0038] In this scheme, when the long end of the large-span cantilever steel structure 3 is supported by a support structure, and the large-span cantilever steel structure 3 deforms due to the support force, the magnitude and direction of the support force applied by the hydraulic support device are adjusted to prevent further deformation of the large-span cantilever steel structure 3. When the short end of the large-span cantilever steel structure 3 is pulled by a tensioning structure, and the large-span cantilever steel structure 3 deforms due to the support force, the magnitude and direction of the tension of the cable 9 are determined. The guide rail 6 is rotated by driving the rotating shaft 5, which drives the slide 7 to slide. The slide 7 moves the bottom end of the cable 9, thereby adjusting the direction of the traction force applied by the cable 9 to the large-span cantilever steel structure 3. After locking the slide 7 and the guide rail 6, the tension of the cable 9 is adjusted by the adjuster, thereby completing the adjustment of the tensioning structure and preventing further deformation of the large-span cantilever steel structure 3. In addition, if strong winds or other situations occur during construction that exert horizontal forces on the large-span cantilever steel structure 3, a certain reverse horizontal force can be applied to the large-span cantilever steel structure 3 by adjusting the direction of the traction force applied by the cable 9, thereby improving the overturning or shear resistance of the large-span cantilever steel structure 3.

[0039] In this embodiment, the hydraulic support device includes a support base 12 detachably connected to the large-span cantilever steel structure 3 and hydraulic cylinders 23 fixed in a circular array on the top of the mounting base 11. The bottom of the support base 12 has a plurality of slide rails 24 arranged in a circular array. The middle of each slide rail 24 is rotatably connected to the bottom of the support base 12. Adjustment seats 25 are slidably connected to each slide rail 24, and each adjustment seat 25 is hinged to the end of the corresponding hydraulic cylinder 23. Locking pins 26 facing the support base 12 are slidably arranged at both ends of the slide rails 24. Elastic reset members 28 are provided between the locking pins 26 and the slide rails 24. The bottom of the support base 12 has a plurality of locking holes that cooperate with the locking pins 26. Identical locking pins 26 are provided on both sides of the adjustment seats 25, and elastic reset members 28 are also provided between the locking pins 26 and the corresponding connecting plates. Locking holes that cooperate with the corresponding locking pins 26 are provided on both sides of the slide rails 24. First electromagnets 27 for attracting the corresponding locking pins 26 are provided at both ends of the slide rails 24 and inside the adjustment seats 25.

[0040] When it is necessary to adjust the direction of the force applied by the hydraulic support structure, the deflection shaft 5 of the support seat 12 is determined, ensuring that the slide rail 24 on the deflection shaft 5 and the first electromagnet 27 on the slide block 7 remain de-energized. At this time, the other first electromagnets 27 are energized, and the first electromagnets 27 attract the corresponding locking pins 26, causing the locking pins 26 to disengage from the corresponding locking holes, thereby allowing the corresponding slide rail 24 to rotate relative to the support seat 12 and the corresponding adjusting seat 25 to slide relative to the slide rail 24. Then, the hydraulic cylinder 23 on one side of the deflection shaft 5 is driven to shorten, and the hydraulic cylinder 23 on the other side is driven to extend, causing the support seat 12 to rotate at a certain angle along the deflection shaft 5. The deflection of the support seat 25 adjusts the direction of the supporting force applied by the support seat 12 to the large-span cantilever steel structure 3. During this process, the hydraulic cylinder 23 drives the adjusting seat 25 to rotate the corresponding slide rail 24 to be perpendicular to the deflection axis 5, and drives the adjusting seat 25 to slide on the slide rail 24, thereby maintaining the connection and support relationship between the hydraulic cylinder 23, the adjusting seat 25 and the slide rail 24. After the adjustment is completed, the hydraulic cylinder 23 is turned off and the first electromagnet 27 is de-energized. The locking pin 26 is inserted into the locking hole under the action of the elastic support member 16, thereby locking the slide rail 24 relative to the support seat 12 and the adjusting seat 25 relative to the slide rail 24, ensuring the support of the support seat 12.

[0041] In this embodiment, the connecting seat 4 has several sets of annular grooves coaxial with the corresponding rotating shaft 5. Annular blocks 13 coaxially connected to each annular groove are rotatably connected. The top of each annular block 13 is fixedly connected to the corresponding guide rail 6. Several limiting blocks 14 are horizontally slidably connected to the inner and outer walls of the annular blocks 13. Several limiting grooves 15 corresponding to the limiting blocks 14 are provided on the side walls of the annular grooves. Several identical limiting grooves 15 are provided on both sides of the inner wall of the guide rail 6. Identical limiting blocks 14 are slidably connected to both sides of the slide block 7. Elastic support members 16 are provided between the annular blocks 13 and the corresponding limiting blocks 14, and between the slide block 7 and the corresponding limiting blocks 14. Second electromagnets 17 for attracting the corresponding limiting blocks 14 are provided inside the annular blocks 13 and on the slide block 7.

[0042] In this scheme, when it is necessary to adjust the direction of the pulling force of the tension structure, the second electromagnet 17 inside the annular block 13 is energized. The second electromagnet 17 attracts the limiting blocks 14 on both sides of the annular block 13, causing them to detach from the limiting groove 15. It then drives the guide rail 6 to rotate via the drive shaft 5, making the guide rail 6 parallel to the desired force direction. At this time, the second electromagnet 17 inside the annular block 13 is de-energized. The limiting blocks 14 on both sides of the annular block 13 are inserted into the limiting groove 15 under the action of the elastic support 16, restricting the rotation of the annular block 13, thereby... The guide rail 6 is restricted from rotating. Then, the second electromagnet 17 inside the slide block 7 is energized, causing it to attract the limiting blocks 14 on both sides of the slide block 7, disengaging them from the limiting groove 15. At this point, the slide block 7 is moved, causing the bottom and top ends of the cable 9 to tilt, thereby changing the direction of the force exerted by the cable 9 on the short end of the cantilevered steel structure 3. After adjustment, the second electromagnet 17 inside the slide block 7 is de-energized, and the limiting blocks 14 on both sides of the slide block 7 are inserted into the limiting groove 15 under the action of the elastic support 16, restricting the movement of the slide block 7. Alternatively, the connection point between the cable 9 and the cantilevered steel structure 3 can be adjusted simultaneously. While maintaining the magnitude and direction of the force exerted by the tension structure on the cantilevered steel structure 3, the point of application of the cable 9 to the cantilevered steel structure 3 is changed, preventing further force from being applied to the deformation area of ​​the cantilevered steel structure 3, thus avoiding further deformation of the cantilevered steel structure 3.

[0043] In this embodiment, the lower end of the mounting base 11 is provided with a receiving groove for accommodating the support section 10. The depth of the receiving groove is greater than the height of the support section 10. The side wall of the mounting base 11 is provided with an opening for the support section 10 to enter and exit. A truss 18 extending out of the mounting base 11 is horizontally fixed at the top of the receiving groove. A hoisting device is slidably connected to the truss 18. The lower end of the mounting base 11 is provided with an annular seat 19 sleeved on the support section 10. A hydraulic lifting device 20 is provided between the annular seat 19 and the mounting base 11. The annular seat 19, the mounting base 11 and the support section 10 are detachably connected.

[0044] In this scheme, after assembling the base 22, mounting seat 11, bottom support section 10, and mounting seat 11, the annular seat 19 is fixed to the support section 10. The mounting seat 11 is then lifted by the hydraulic lifting device 20, placing it above the support section 10. At this point, the remaining support sections 10 are lifted using hoisting equipment, and the support sections 10 are sent into the mounting seat 11 through the opening using sliding hoisting equipment. Then, the support sections 10 are placed on the bottom support section 10 using hoisting equipment, and the adjacent support sections 10 are then... The mounting base 11 is then fixed to the upper support section 10 using bolts. The connection between the annular seat 19 and the support section 10 is then released. The annular seat 19 is then moved upwards to the upper support section 10 using the hydraulic jacking device 20. The annular seat 19 is then fixed to the support section 10, and the connection between the mounting base 11 and the support section 10 is released. The mounting base 11 is then lifted using the hydraulic jacking device 20. This process is repeated until the hydraulic support structure at the top of the mounting base 11 contacts the large-span cantilever steel structure 3. This design makes the installation of the support structure more convenient, eliminating the need for additional lifting equipment.

[0045] In this embodiment, the inner and outer walls of the annular block 13 are welded and fixed with coaxial anti-pull-out rings 21, and the side walls of the annular groove are provided with matching grooves corresponding to the anti-pull-out rings 21; by setting the anti-pull-out rings 21, the annular block 13 is prevented from detaching from the connecting seat 4, thus affecting the stability of the tension structure.

[0046] In this embodiment, reinforcing ribs (a conventional technique, so not shown in the figure) are welded and fixed between the guide rail 6 and the corresponding annular block 13 to strengthen the connection between the guide rail 6 and the annular block 13 and prevent the guide rail 6 from deforming under the action of the cable 9 and failing to play a stable supporting role.

[0047] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A construction method of a large-span cantilever steel structure, characterized by, It comprises the following steps: 1) bottom concrete structure pouring: laying formwork, pouring the lower core tube on the ground; and pouring the concrete beam connected with the ground on the side wall of the lower core tube; 2) installing temporary support device: the temporary support device comprises a pulling structure installed on the concrete beam, which is used to pull the short end overhang of the large-span cantilever steel structure; the temporary support device further comprises a support structure installed on the ground, which is used to support the long end overhang of the large-span cantilever steel structure; the pulling structure comprises a connecting seat arranged on the concrete beam, a plurality of vertically arranged rotating shafts rotatably connected to the connecting seat, horizontally arranged guide rails fixed to the top ends of the rotating shafts, sliding seats slidably connected to the guide rails, pulling seats arranged on the sliding seats, and inhaul cables arranged on the pulling seats and detachably connected with the large-span cantilever steel structure; the pulling seats are provided with adjusters for adjusting the tension of the inhaul cables; the support structure comprises a base arranged on the ground, a plurality of support segments connected with each other, and an installation seat arranged at the top end of the top support segment, wherein a hydraulic support device for supporting the large-span cantilever steel structure is arranged on the installation seat, and the size and direction of the support force exerted by the hydraulic support device are adjustable; 3) large-span cantilever steel structure installation: hoisting the steel structure core tube in the large-span cantilever steel structure on the lower core tube, and installing the remaining steel structure in sections, wherein the support structure is used to support the large-span cantilever steel structure during the process; after the installation of the large-span cantilever steel structure is completed, the short end of the large-span cantilever steel structure is pulled through the pulling structure, and the support structure is removed; 4) pouring: pouring the remaining concrete structure; 5) temporary support device adjustment: during the construction process, the force exerted by the temporary support device on the large-span cantilever steel structure is adjusted according to the deformation trend of the large-span cantilever steel structure, so as to prevent excessive deformation of the large-span cantilever steel structure.

2. The temporary support device involved in the construction method of a large-span cantilever steel structure according to claim 1, characterized in that: The hydraulic support device comprises a support seat detachably connected with the large-span cantilever steel structure and a plurality of hydraulic cylinders arranged in a circular array at the top of the installation seat; a plurality of sliding rails are arranged in a circular array at the bottom of the support seat, the middle portions of the sliding rails are rotatably connected to the bottom of the support seat, adjusting seats are slidably connected to the sliding rails, and the adjusting seats are hingedly connected with the end portions of the corresponding hydraulic cylinders; locking pins are slidably arranged at the two ends of the sliding rails and face the support seat, elastic return members are arranged between the locking pins and the sliding rails, a plurality of locking holes matched with the locking pins are arranged at the bottom of the support seat; the same locking pins are arranged on the two sides of the adjusting seat, elastic return members are also arranged between the locking pins and the corresponding connecting plates, and locking holes matched with the corresponding locking pins are arranged on the two sides of the sliding rails; first electromagnets for adsorbing the corresponding locking pins are arranged in the two ends of the sliding rails and the adjusting seat.

3. The temporary support device of claim 2, wherein: The connecting seat is provided with a plurality of groups of annular grooves coaxial with corresponding rotating shafts, the annular grooves are all connected with annular blocks coaxially, the top of the annular blocks is fixedly connected with corresponding guide rails, a plurality of limiting blocks are horizontally and slidably connected on the inner and outer sidewalls of the annular blocks, and the sidewalls of the annular grooves are provided with a plurality of limiting grooves corresponding to the limiting blocks.

4. The temporary support device of claim 3, wherein: The lower end of the mounting seat is provided with an accommodating groove for accommodating the supporting joint, the depth of the accommodating groove is greater than the height of the supporting joint, the sidewall of the mounting seat is provided with an opening for the supporting joint to enter and exit, the top of the accommodating groove is fixedly provided with a truss extending out of the mounting seat, and the truss is slidably connected with the hoisting equipment.

5. The temporary support device of claim 4, wherein: The circumferential side of the annular block is provided with a pull-out ring, and the sidewall of the annular groove is provided with a matching groove corresponding to the pull-out ring.

6. The temporary support device of claim 5, wherein: The guide rail is fixedly connected with the corresponding annular block.

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