Construction method of long-span concrete-filled steel tube arch bridge

Abstract

The present application relates to a kind of construction methods of long-span steel pipe concrete arch bridge, comprising the following steps: temporary support erection, arch foot formwork support erection, tie beam construction, steel pipe arch splicing auxiliary device installation, suspender construction.The beneficial effects of the present application are: arranging integral type inclined support quick connection in temporary support system, improving construction efficiency, and meeting the requirements of strength, stiffness and stability;Establishing cast-in-place tie beam support system in navigable water area, tie beam support uses steel pipe pile as temporary pier of temporary support, section steel, bailey beam as distribution load-bearing component, and has reserved navigation hole, improves overall construction safety;By lengthening steel pipe pile, erecting arch rib installation support, meeting the requirements of strength, stiffness and stability, and adding air splicing auxiliary device on arch rib support, effectively improving the speed and accuracy of arch rib air installation;Using suspender auxiliary jig to install suspender, improves the construction quality and construction efficiency of suspender installation.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction, and in particular relates to a construction method for a long-span steel-concrete composite arch bridge. Background Technology

[0002] With the rapid advancement of my country's modernization, railways, highways, and urban transportation lines have become ubiquitous across the country. As a crucial link in these transportation networks, bridge construction has also shone brightly and achieved remarkable success.

[0003] The application of prestressed systems and concrete-filled steel tubular (CFST) in bridge structures has enhanced the adaptability of arch bridges to foundations and enabled them to have increasingly larger spans, leading to the rapid development of CFST arch bridges. CFST arch bridges are widely used due to their advantages of high span capacity, low self-weight, and low tie rod costs. However, with the increase in span and decrease in the width-to-span ratio of CFST tied arch bridges, the difficulty of on-site construction is also increasing.

[0004] In traditional construction methods, erecting scaffolding segments often requires significant time and labor costs. High-altitude installation of steel pipe arches is particularly prone to problems such as difficulty in aerial positioning. Furthermore, the installation of suspension rods also presents challenges in precise positioning and installation.

[0005] Therefore, it is urgent to innovate the construction methods of large-span steel-concrete composite arch bridges based on the summary of traditional construction methods, and to propose construction methods for large-span steel-concrete composite arch bridges to improve the efficiency and quality of assembly and system conversion construction of large-span steel-concrete composite arch bridges. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a construction method for a long-span steel-concrete composite arch bridge.

[0007] The construction method for this type of long-span steel-concrete composite arch bridge includes the following steps:

[0008] Step 1: Erection of temporary scaffolding: After constructing steel pipe piles below the designed positions of the arch foot and tie beam, erect temporary scaffolding for the steel pipe piles.

[0009] Step 2: Erection of arch foot formwork support: Install the bottom formwork on the temporary support of the steel pipe piles at the end, and pour the arch foot concrete;

[0010] Step 3, Tie Beam Construction: Above the temporary steel pipe pile support at the bottom of the tie beam, install sand boxes, transverse load-bearing beams, and longitudinal load-bearing beams in sequence from bottom to top, then install Bailey beams and distribution beams, and finally construct the tie beams.

[0011] Step 4: Installation of steel pipe arch splicing auxiliary device: Install the steel pipe arch mounting bracket on the transverse load-bearing beam, and then install the arch rib splicing auxiliary device on the top of the steel pipe column;

[0012] Step 5, Installation of the Hanger Rod: After the installation of a section of the steel pipe arch is completed, the hanger rod auxiliary frame moves the hanger rod to the designated position. Then, the top of the hanger rod and the steel pipe arch are temporarily fixed by the steel pipe arch clamps. The position of the I-beam hanger rod is adjusted, and then the hanger rod is installed.

[0013] As a preferred option, in step one, an integral diagonal brace is installed between two pairs of steel pipe piles. The integral diagonal brace is temporarily fixed by setting two upper and lower wedge-shaped auxiliary welding blocks between the integral diagonal brace and the steel pipe pile, and then welded to fix it.

[0014] Preferably, in step two, double-I-beams are installed on the temporary support of the steel pipe piles at the ends. The double-I-beams are equipped with limiting short steel bars and angle steel on the outside, and are fixed to the arch foot by positioning pre-embedded bolts. Then, a channel steel beam with an angle steel positioning cylinder is installed, and a supporting angle steel is installed inside the angle steel positioning cylinder. Then, the bottom formwork is installed. The bottom formwork is equipped with a channel steel upper bracket. The lower part of the channel steel upper bracket is connected to the supporting angle steel and the adjustment support frame. The adjustment support frame is placed at the bottom formwork elevation change point. The upper part of the adjustment support frame is equipped with a butterfly-shaped adjusting screw for adjusting the bottom formwork elevation. Then, the arch foot concrete is poured, and a steel pipe arch positioning plate is set at the end of the arch foot.

[0015] As a preferred option, in step three, a sand box placement groove is provided on the top surface of the temporary support for the steel pipe piles below the sand box. The sand box is installed in the sand box placement groove of the temporary support for the steel pipe piles at the bottom of the tie beam, and the elevation of the sand box is adjusted. Then, the transverse load-bearing beam is installed, the longitudinal load-bearing beam is installed, the Bailey beam and the distribution beam are installed, and finally the reinforcing steel is tied and the tie beam concrete is poured.

[0016] Preferably, in step four, a steel pipe arch mounting bracket is provided on the transverse load-bearing beam. The steel pipe arch mounting bracket includes steel pipe columns, and an integral cross support frame is provided between two steel pipe columns. A ladder is provided inside the steel pipe arch mounting bracket. A clamp plate is provided on the steel pipe column for positioning the integral cross support frame. A plug weld is provided between the steel pipe column and the integral cross support frame. A distribution beam support is provided on the top surface of the steel pipe column. A steel pipe arch distribution beam is placed on the top of the distribution beam support. Finally, an arch rib splicing auxiliary device is provided on the top of the steel pipe arch distribution beam.

[0017] Preferably, in step four, the arch rib splicing auxiliary device is placed on the steel pipe arch distribution beam. One end of the steel pipe arch distribution beam is equipped with an inwardly inclined limiting I-beam and an anti-inwardly tilting brace. The other end is equipped with two vertical jacks via a vertical jack base. A limiting angle steel is provided on one side of the vertical jack. A horizontal jack base is provided on the limiting angle steel. A horizontal jack is provided on the horizontal jack base. Both the vertical jack base and the top of the horizontal jack are equipped with top supports. An arc-shaped steel plate is provided on the top of the arch rib splicing auxiliary device.

[0018] Preferably, in step five, the top section of the boom is provided with a boom support plate, the boom support plate is provided with a lower and a lower rotating hinge, a rotating rod is provided on the lower rotating hinge, an upper rotating hinge is provided on the top of the rotating rod, the upper rotating hinge is connected to a steel pipe arch clamp, the steel pipe arch clamp is U-shaped, the bottom of the steel pipe arch clamp is provided with a steel pipe arch clamp tie rod, the bottom section of the boom is provided with a boom clamp, the outside of the boom clamp is provided with a frame I-beam, the frame I-beam is placed on the top surface of the boom auxiliary frame, the bottom of the boom auxiliary frame is provided with a crossbar adjustment groove, the crossbar adjustment groove is provided with an I-beam suspension rod, the I-beam suspension rod is suspended by an I-beam suspension rope, and the bottom of the boom auxiliary frame is provided with a pulley.

[0019] As a preferred option, in step five, after a section of the steel pipe arch is installed, a hanger is installed at the designed position. The hanger is placed on the hanger auxiliary frame and moved to the designated position by pulleys. Then, the top of the hanger is temporarily fixed by the steel pipe arch clamp on the upper part of the steel pipe arch. The position of the I-beam hanger bar is adjusted so that it falls into the adjustment groove of the next crossbar, so that the double-section I-beam touches the ground, and then the hanger is installed.

[0020] As a preferred option, step five is followed by step six, which specifically involves the conversion of the arch bridge system: after the concrete inside the steel pipe reaches the design strength, the steel pipe arch installation support is removed, each hanger is symmetrically installed, and the hangers are tensioned in stages. During each tensioning, two corresponding hangers symmetrical about the mid-span are tensioned simultaneously, and their cable forces are adjusted so that the tension of each hanger reaches the design requirements, maintaining the balance of the hanger cable forces.

[0021] A long-span steel-concrete composite arch bridge, obtained by any of the methods described above.

[0022] The beneficial effects of this invention are:

[0023] 1) In the temporary support system, an integral diagonal brace is arranged for quick connection to improve construction efficiency and meet the requirements of strength, rigidity and stability.

[0024] 2) A cast-in-place tie beam support system was established for navigable waterways. The tie beam support uses steel pipe piles as temporary piers for temporary supports, and steel sections and Bailey beams as load-bearing components. Navigation holes are reserved to improve the overall construction safety.

[0025] 3) By extending the steel pipe piles and erecting arch rib installation supports, the requirements for strength, rigidity and stability are met. An aerial splicing auxiliary device is added to the arch rib support to effectively improve the speed and accuracy of the aerial installation of the arch rib.

[0026] 4) The use of a hanger-assisted frame for hanger installation improves the construction quality and efficiency of hanger installation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall construction of the large-span steel-concrete composite arch bridge of the present invention;

[0028] Figure 2 This is a schematic diagram of the arch foot structure;

[0029] Figure 3 This is an enlarged schematic diagram of the arch foot structure;

[0030] Figure 4 This is a schematic diagram of the steel pipe column structure of the auxiliary device for splicing steel pipe arches;

[0031] Figure 5 yes Figure 4 Schematic diagram of the tie beam support in section AA;

[0032] Figure 6 yes Figure 5 Enlarged view of region B in the middle;

[0033] Figure 7 This is a schematic diagram of the splicing auxiliary device;

[0034] Figure 8 This is an enlarged view of the splicing auxiliary device;

[0035] Figure 9 This is a diagram showing the installation of the hanger rod;

[0036] Figure 10 This is a structural diagram of the hanger auxiliary frame.

[0037] Among them: 1. Steel pipe arch 2. Arch foot 3. Wet joint formwork tie bolts 4. Formwork reinforcing channel steel 5. Wet joint formwork 6. Tie beam 7. Bottom formwork bolt 8. Support angle steel 9. Angle steel positioning cylinder 10. Channel steel crossbeam 11. Steel pipe pile 12. Integral diagonal brace 13. Wedge-shaped auxiliary welding block 14. 15. Adjustment support frame; 16. Channel steel upper support frame; 17. Cap beam; 18. End crossbeam; 19. Bottom formwork; 20. Butterfly-shaped adjusting screw; 21. Angle steel; 22. I-beam support slot; 23. Double-jointed I-beam; 24. Limiting short steel bar; 25. Steel pipe arch positioning plate; 26. Positioning embedded bolt; 27. Sand box support slot; 28. Longitudinal load-bearing beam; 29. ​​Bailey beam; 30. Distribution beam; 31. Arch rib splicing auxiliary device; 32. Integral cross support frame; 33. Ladder; 34. Welded joint; 35. Hoop support plate; 36. Steel pipe column; 37. Steel pipe arch distribution beam; 38. Distribution beam support; 39. Hanger; 30. Lateral load-bearing. 40. Beam; 41. Sandbox; 42. Vertical jack; 43. Horizontal jack base; 44. Curved steel plate; 45. Top support; 46. Horizontal jack; 47. Limiting angle steel; 48. Vertical jack base; 49. Inward tilting limiting I-beam; 50. Anti-inward tilting brace; 51. Auxiliary frame for hanging rod; 52. Horizontal bar adjustment groove; 53. Hanging rod clamp; 54. Hanging rod support plate; 55. Steel pipe arch clamp tie rod; 56. Upper rotating hinge; 57. Lower rotating hinge; 58. Frame I-beam; 59. I-beam lifting rod; 60. Pulley; 61. Hanging rod base; 62. I-beam lifting rope; 63. Positioning double-section I-beam. Detailed Implementation

[0038] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0039] Example 1

[0040] As one example, the construction method for this long-span steel-concrete composite arch bridge includes the following steps:

[0041] Step 1: Temporary scaffolding erection: After constructing the steel pipe piles 11, install integral diagonal braces 12 between each pair of steel pipe piles. Temporarily fix the integral diagonal braces 12 by setting two upper and lower wedge-shaped auxiliary welding blocks 13 between the integral diagonal braces 12 and the steel pipe piles 11, and then weld them in place.

[0042] Step 2: Erection of arch foot formwork support: Install double-section I-beams 63 on the temporary support at the end, then install channel steel beams 10, install supporting angle steel 8 inside angle steel positioning cylinders 9, then install bottom formwork 18, and adjust the elevation of bottom formwork 18 by adjusting butterfly clip adjusting screws 19, and then pour concrete for arch foot 2.

[0043] Step 3, Tie Beam Construction: Install sand box 40 in the sand box placement groove 26 of the temporary support for steel pipe piles at the bottom of tie beam 6, and adjust the elevation of sand box 40. Then install transverse load-bearing beam 39, longitudinal load-bearing beam 27, Bailey beam 28 and distribution beam 29, and finally tie the reinforcing steel and pour concrete for tie beam 6.

[0044] Step 4: Installation of steel pipe arch splicing auxiliary device: Install steel pipe columns 35 of the steel pipe arch splicing auxiliary device on the transverse load-bearing beam 39, and install integral cross support frames 31 between each pair of steel pipe columns 35, placing them on clamp brackets 34 and fixing them with weld seams 33. Then install the arch rib splicing auxiliary device 30 on the top of the steel pipe columns 35.

[0045] Step 5, Installation of Hanger Rods: After the installation of one section of the steel pipe arch 1 is completed, hanger rods 38 are installed at the designed position. Hanger rods 38 are placed on the hanger rod auxiliary frame 50 and moved to the designated position by pulleys 60. Then, the top of hanger rods 38 is temporarily fixed by the steel pipe arch clamps 55 on the upper part of the steel pipe arch 1. The position of the I-beam hanger rods 59 is adjusted so that they fall into the adjustment groove 51 of the next crossbar section, so that the double-splitter I-beams 63 are on the ground. Then, hanger rods 38 are installed.

[0046] Step Six: Arch Bridge System Conversion: After the concrete inside the steel pipe reaches its design strength, remove the arch rib support, symmetrically install each hanger 38, and initially tighten the hangers 38. Perform the first tensioning of the hangers 38, requiring symmetry around the mid-span, with two corresponding hangers 38 tensioned simultaneously, continuously adjusting their cable tension to ensure each hanger 38 reaches the design tension and maintains balanced cable tension. Then perform the second and third tensioning of each hanger 38, in the same sequence.

[0047] Example 2

[0048] As another embodiment, the large-span steel-concrete composite arch bridge obtained by the method in Embodiment 1, such as... Figures 1 to 10As shown, the structure includes a steel pipe arch 1, arch feet 2, tie beam 6, integral diagonal brace 12, cap beam 16, steel pipe pile 11, Bailey beam 28, arch rib splicing auxiliary device 30, and hanger auxiliary frame 50. Temporary steel pipe pile supports are provided at the bottom of the arch feet 2 on one side of the cap beam 16 and at the bottom of the tie beam 6. The top of the temporary steel pipe pile supports is provided with the bottom formwork 18 of the arch feet 2. The tie beam 6 is provided between the two arch feet 2. The steel pipe arch 1 is provided between the two arch feet 2 above the tie beam 6. The hanger 38 is provided between the tie beam 6 and the steel pipe arch 1. The top of the hanger 38 is fixed to the steel pipe arch 1 by the steel pipe arch clamp 55. The hanger auxiliary frame 50 is provided on both sides of the bottom of the hanger 38. The arch rib splicing auxiliary device 30 is provided at the bottom of the steel pipe arch 1. The steel pipe arch installation support is provided below the arch rib splicing auxiliary device 30.

[0049] The bottom formwork 18 is provided with a channel steel upper support 15 at its lower part. The channel steel upper support 15 is provided with a supporting angle steel 8 and an adjustment support frame 14 at its lower part. The bottom of the supporting angle steel 8 is provided with a channel steel crossbeam 10 with an angle steel positioning cylinder 9. The bottom of the channel steel crossbeam 10 is provided with a double-jointed I-beam 22. The outer side of the double-jointed I-beam 22 is provided with a limiting short steel bar 23 and an angle steel 20. The bottom of the double-jointed I-beam 22 is provided with an I-beam support groove 21. The I-beam support groove 21 is placed on top of the steel pipe pile 11. The adjustment support frame 14 is placed at the elevation change point of the bottom formwork 18. The upper part of the adjustment support frame 14 is provided with a butterfly-shaped adjusting screw 19 for adjusting the elevation. The end of the arch foot 2 is provided with a steel pipe arch positioning plate 24, which is fixed to the arch foot 2 by positioning pre-embedded bolts 25.

[0050] The tie beam 6 is provided with an arch foot 2 at its end. Both arch feet 2 are provided with an end beam 17 in the transverse direction. The arch feet 2 are on the cap beam 16. A wet joint is provided between the arch feet 2 and the tie beam 6. A wet joint template 5 is provided on the outside of the wet joint. A wet joint tie bolt 3 is provided on the top of the wet joint template 5. A template reinforcing channel steel 4 is provided on the surface of the wet joint template 5. A bottom mold screw 7 is provided at the bottom of the wet joint template 5.

[0051] like Figure 4-8 As shown, the bottom of the tie beam 6 is provided with a distribution beam 29, which is placed on the Bailey beam 28. The lower part of the Bailey beam 28 is provided with a longitudinal load-bearing beam 27, the bottom of the longitudinal load-bearing beam 27 is provided with a transverse load-bearing beam 39, the lower part of the transverse load-bearing beam 39 is provided with a sand box 40, the top surface of the temporary support for steel pipe piles below the sand box 40 is provided with a sand box placement groove 26, and the sand box 40 is placed on the sand box placement groove 26. The temporary support for steel pipe piles includes steel pipe piles 11, and an integral diagonal brace 12 is provided between the steel pipe piles 11. The end of the integral diagonal brace 12 is fixed to the steel pipe pile 11 by auxiliary welding through a wedge-shaped auxiliary welding block 13.

[0052] A steel pipe arch mounting bracket is provided on the transverse load-bearing beam 39. The steel pipe arch mounting bracket includes steel pipe columns 35. An integral cross support frame 31 is provided between two steel pipe columns 35. A ladder 32 is provided inside the steel pipe arch mounting bracket. A clamp plate 34 is provided on the steel pipe column 35 for positioning the integral cross support frame 31. A plug weld 33 is provided between the steel pipe column 35 and the integral cross support frame 31. A distribution beam support 37 is provided on the top surface of the steel pipe column 35. A steel pipe arch distribution beam 36 is placed on the upper part of the distribution beam support 37. An arch rib splicing auxiliary device 30 is provided on the steel pipe arch distribution beam 36.

[0053] like Figure 7-8 As shown, the top of the steel pipe arch mounting bracket is provided with a steel pipe arch distribution beam 36. The arch rib splicing auxiliary device 30 is placed on the steel pipe arch distribution beam 36. One end of the steel pipe arch distribution beam 36 is provided with an inward tilting limiting I-beam 48 and an anti-inward tilting brace 49. The other end is provided with two vertical jacks 41 through a vertical jack base 47. A limiting angle steel 46 is provided on one side of the vertical jack 41. A horizontal jack base 42 is provided on the limiting angle steel 46. A horizontal jack 45 is provided on the horizontal jack base 42. The ends of the vertical jack base 47 and the horizontal jack 45 are provided with top supports 44. The top of the arch rib splicing auxiliary device 30 is provided with an arc-shaped steel plate 43.

[0054] like Figure 9-10 As shown, the lifting rod 38 is placed at the lower part of the steel pipe arch 1. The top section of the lifting rod 38 is provided with a lifting rod support plate 53. The lifting rod support plate 53 is provided with a lower rotating hinge 57. A rotating rod is provided on the lower rotating hinge 57. An upper rotating hinge 56 is provided at the top of the rotating rod. The upper rotating hinge 56 is connected to a steel pipe arch clamp 55. The steel pipe arch clamp 55 is U-shaped. The bottom of the steel pipe arch clamp 55 is provided with a steel pipe arch clamp tie rod 54. The bottom section of the lifting rod 38 is provided with a lifting rod clamp 52. A frame I-beam 58 is provided on the outside of the lifting rod clamp 52. The frame I-beam 58 is placed on the top surface of the lifting rod auxiliary frame 50. The bottom of the lifting rod auxiliary frame 50 is provided with a crossbar adjustment groove 51. An I-beam lifting rod 59 is provided in the crossbar adjustment groove 51. A positioning double-splitting I-beam 63 is suspended on the I-beam lifting rod 59 by an I-beam lifting rope 62. A pulley 60 is provided at the bottom of the lifting rod auxiliary frame 50.

[0055] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A construction method of a long-span concrete-filled steel tube arch bridge, characterized in that Comprising the following steps: Step one, temporary support erection: steel pipe pile is constructed under the design position of arch foot and tie beam to erect steel pipe pile temporary support; Step two, arch foot formwork support erection: bottom form is installed on the steel pipe pile temporary support at the end to conduct arch foot concrete pouring; Step three, tie beam construction: sand box, transverse bearing beam and longitudinal bearing beam are sequentially installed from bottom to top above the steel pipe pile temporary support at the bottom of tie beam, then bailey beam and distribution beam are installed, and finally tie beam is constructed; the top surface of steel pipe pile temporary support below sand box is provided with sand box resting groove, sand box is installed in the sand box resting groove of steel pipe pile temporary support at the bottom of tie beam, and sand box elevation is adjusted, then transverse bearing beam is installed, longitudinal bearing beam is installed, bailey beam and distribution beam are installed, finally steel bars are bound, and tie beam concrete is poured; Step four, steel pipe arch splicing auxiliary device installation: steel pipe arch installation support is installed on transverse bearing beam, then arch rib splicing auxiliary device is installed on the top of steel pipe column; transverse bearing beam is provided with steel pipe arch installation support, the steel pipe arch installation support comprises steel pipe column, integral cross support frame is arranged between the two steel pipe columns, ladder is arranged inside the steel pipe arch installation support, hoop support plate is arranged on the steel pipe column to position the integral cross support frame, plug weld is arranged between the steel pipe column and the integral cross support frame, distribution beam support is arranged on the top surface of the steel pipe column, steel pipe arch distribution beam is placed on the upper part of the distribution beam support, and finally arch rib splicing auxiliary device is arranged on the top of the steel pipe arch distribution beam; the arch rib splicing auxiliary device is arranged on the steel pipe arch distribution beam, the steel pipe arch distribution beam is provided with inwardly inclined limit I-beam and anti-inwardly inclined braces at one end, two vertical jacks are arranged at the other end through vertical jack base, limit angle steel is arranged on one side of the vertical jack, horizontal jack base is arranged on the limit angle steel, horizontal jack is arranged on the horizontal jack base, top support is arranged on the vertical jack base and the horizontal jack end part, and arc-shaped steel plate is arranged on the top of the arch rib splicing auxiliary device; Step five, suspender construction: after one section of steel pipe arch is installed, the suspender auxiliary bed frame moves the suspender to the designated position, then the top of the suspender and the steel pipe arch are temporarily fixed through the steel pipe arch hoop, the position of I-beam suspending bar is adjusted, and then the suspender is installed; the top section of the suspender is provided with suspender support plate, the suspender support plate is provided with lower rotary hinge, the lower rotary hinge is provided with rotary rod, the top of the rotary rod is provided with upper rotary hinge, the upper rotary hinge is connected with steel pipe arch hoop, the steel pipe arch hoop is in U shape, the steel pipe arch hoop is provided with steel pipe arch hoop opposite-pulling screw at the bottom, the bottom section of the suspender is provided with suspender hoop, the outer side of the suspender hoop is provided with bed frame I-beam, the bed frame I-beam is arranged on the top surface of the suspender auxiliary bed frame, the bottom of the suspender auxiliary bed frame is provided with horizontal rod adjusting groove, the horizontal rod adjusting groove is provided with I-beam suspending bar, the I-beam suspending bar is hung with landing double-spliced I-beam through I-beam suspending rope, and the bottom of the suspender auxiliary bed frame is provided with pulley.

2. The construction method of a long-span steel pipe concrete arch bridge according to claim 1, characterized in that, In step one, integral diagonal braces are arranged between two steel pipe piles, and the integral diagonal braces are welded and fixed after being temporarily fixed through the upper and lower wedge-shaped auxiliary welding blocks arranged between the integral diagonal braces and the steel pipe piles.

3. The construction method of a long-span steel pipe concrete arch bridge according to claim 1, characterized in that, In step two, the double-spliced I-beam is installed on the temporary support of the steel pipe pile at the end, and the outer side of the double-spliced I-beam is provided with limiting short steel bars and angle steels, which are fixed with the arch foot through positioning pre-buried bolts; then the channel steel cross beam with the angle steel positioning cylinder is installed, the supporting angle steel is installed in the angle steel positioning cylinder, then the bottom die is installed, the bottom die is provided with a channel steel upper bracket at the lower part, the channel steel upper bracket is connected with the supporting angle steel and the position adjusting support frame at the lower part, the position adjusting support frame is arranged at the variable elevation of the bottom die, the position adjusting support frame is provided with a butterfly-shaped clamping adjusting screw rod at the upper part for adjusting the elevation of the bottom die, then the arch foot concrete is poured, and the steel pipe arch positioning plate is arranged at the end of the arch foot.

4. The construction method of a long-span steel pipe concrete arch bridge according to claim 1, characterized in that, In step five, after the installation of a section of the steel pipe arch is completed, the suspender is installed at the designed position, the suspender is arranged on the suspender auxiliary jig, is moved to the specified position through the pulley, then the top of the suspender is temporarily fixed through the steel pipe arch hoop at the upper part of the steel pipe arch, the position of the I-beam suspending rib is adjusted, so that the double-spliced I-beam falls into the next section of the horizontal rod adjusting groove, the double-spliced I-beam is landed, and then the suspender is installed.

5. The construction method of a long-span steel pipe concrete arch bridge according to claim 1, characterized in that, After step five, step six is further included, and step six specifically comprises: arch bridge system conversion: after the concrete in the steel pipe reaches the design strength, the steel pipe arch installation support is removed, each suspender is symmetrically arranged, and the suspenders are tensioned in batches, the two corresponding suspenders at the center of the span are simultaneously tensioned when tensioning each time, the cable force is adjusted, so that the tensioning force of each suspender reaches the design requirement, and the cable force of the suspenders is balanced.

Images