Steel-concrete composite beam ramp bridge and construction method

Abstract

The invention relates to a steel-concrete composite beam ramp bridge and a construction method. An adjustable stand device for steel box beams is adopted to solve the cross slope change of the curved bridge deck. A positioning adjuster is arranged on the top of a temporary pier to improve the positioning accuracy of the steel box beam. In-box triangular supports and transverse triangular supports are adopted to reinforce the temporary internal support of the steel box beam segment to avoid the problem of deformation of the steel box beam during hoisting. The prefabricated bridge deck is hoisted onto the main beam with the assistance of a drop bracket, which improves the placement accuracy of the bridge deck and speeds up the construction of the ramp bridge. A variable-height steel guide beam technology is adopted to realize the curved top-pushing of a large-span narrow box steel box beam without temporary piers through the horizontal jack and the vertical jack provided at the front end of the guide beam.

Description

Technical Field

[0001] The invention belongs to the field of bridges, and in particular relates to a steel-concrete composite beam ramp bridge and a construction method. Background Art

[0002] Compared with traditional reinforced concrete structures, steel box girders have the characteristics of light weight, small cross-section, high space utilization, and short construction period, so they are widely used in urban bridge construction. Since new urban transportation infrastructure often needs to face busy road traffic and complex surrounding environment, it is difficult to control the posture of the bridge beam on the flat curve during the construction of the ramp bridge. Although the jacking method can be used on straight bridges such as various bridge types and road-rail bridges, it is difficult to control the spatial posture of the curved bridge using the conventional jacking method.

[0003] In summary, for the construction of steel-concrete composite beam ramp bridges, there is an urgent need for a steel-concrete composite beam ramp bridge with fast construction speed, high jacking accuracy, and adaptability to different curves and a construction method thereof. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a steel-concrete composite beam ramp bridge and a construction method.

[0005] The construction method of the steel-concrete composite beam ramp bridge comprises the following steps:

[0006] Step 1: After assembling the bench, complete the assembly of the segmental steel box girder on the bench;

[0007] Step 2: fix the positioning bracket to the side of the steel box girder, connect the prefabricated bridge deck to the top of the positioning bracket, shorten the positioning bracket, and synchronously place the prefabricated bridge deck on the top of the steel box girder with the gantry crane;

[0008] Step 3: Positioning of steel box beam: transport the steel box beam to the temporary pier at the bridge construction site. The temporary pier adjusts the pre-steel box beam to the designed elevation and inclination angle through the positioning adjuster;

[0009] Step 4: Guide beam installation: connect the segmental steel box beam to the steel guide beam. The end of the steel guide beam is in an inverted step shape and vertical jacks and horizontal deviation correction jacks are installed;

[0010] Step 5: Jacking construction: Use the jacking system to jack up the steel box girder, open the jacking cylinder to move the steel box girder forward as a whole, and use the vertical jack to lift the steel guide beam over the pier at the jacking pier.

[0011] Preferably, the pedestal includes an adjustable pedestal and connecting square steels, a base plate is provided at the bottom of the adjustable pedestal, wherein the adjustable pedestal includes an inner steel pipe and an outer steel pipe, the outer steel pipe is inserted into the inner steel pipe, and the inner steel pipe and the outer steel pipe are fixed at a certain length by fixing bolts to adapt to the changes in the cross slope of the curved bridge deck and the shape of the steel box girder; the adjustable pedestal is welded on the top of the base plate, and the connecting square steels are welded to adjacent adjustable pedestals to form a cross-connection pedestal and a side main beam pedestal; the side main beam pedestals are distributed on both sides of the cross-connection pedestal; the steel box girder includes a side main beam and a cross connection, the cross-connection pedestal is supported under the cross connection, and the side main beam pedestal is supported under the side main beam; an inner-box triangular support is provided in the side main beam, and a transverse triangular support is provided between the side main beams on both sides of the cross connection.

[0012] Preferably, the landing bracket includes a docking bayonet device, a thin steel pipe, a thick steel pipe, a steel pipe length adjustment nut, a U-shaped buckle and a fastening bolt. The steel pipe length adjustment nut connects the thin steel pipe and the thick steel pipe. The thin steel pipe is arranged above the thick steel pipe. The docking bayonet device is installed on the top of the thin steel pipe. The bottom of the thick steel pipe is connected to the U-shaped buckle, and the fastening bolts are installed above and below the U-shaped buckle.

[0013] Preferably, the top plate of the docking bayonet device is installed on the top of the thin steel pipe, a slot is installed on one side of the top plate, telescopic heads are installed on both sides of the top of the slot, and limit blocks are arranged on the outside of the telescopic heads; an embedded joint of the docking bayonet device is provided at the bottom of the prefabricated bridge panel, a symmetrical fixed plate is arranged at the bottom of the embedded joint, a spring is arranged on the outside of the fixed plate, and the spring is connected with a telescopic buckle; grooves matching the telescopic buckle are opened on the inner walls on both sides of the slot, and after the embedded joint is docked with the slot, the telescopic buckle is clamped in the groove of the slot; when the landing bracket and the prefabricated bridge panel are disassembled, the telescopic buckle is pushed out of the groove mouth by the telescopic heads on both sides of the slot to separate the embedded joint and the slot.

[0014] Preferably, the temporary pier includes steel pipe columns, and adjacent steel pipe columns are connected by channel steel to form a temporary pier. A crossbeam is arranged on the top of the temporary pier, and secondary beams are connected between the crossbeams. A first corbel reinforcement is arranged on the lower side of the crossbeam, and double-jointed limit plates are arranged on both sides above the crossbeam. The positioning adjuster is arranged on the opposite surfaces of the double-jointed limit plates on both sides and on the crossbeam. A pad is also arranged on the crossbeam, and the positioning adjuster is supported on the bottom and both sides of the steel box girder.

[0015] Preferably, the positioning adjuster includes a base, a guide column, a hydraulic cylinder, a limit block, a sliding rod and a top plate. The hydraulic cylinders are installed on both sides above the base, and the top plate is installed on the top of the hydraulic cylinder. Limit blocks are set at the front and back of the center of the bottom surface of the top plate, and sliding rods are passed between the limit blocks. Guide columns are set at the front and back of the center of the base, and the sliding rods pass through the limit blocks and guide columns on both sides to form a rotating shaft of the top plate, and the top plate is pressed against the surface of the steel box girder.

[0016] Preferably, a number of pads and jacking systems are set up on the jacking pier, and a fixed plate is fixed on the pad, and a vertical jack and a horizontal correction jack are arranged under the step at the end of the steel guide beam; when the steel guide beam is lifted over the pier, the vertical jack contacts the pad to carry out the jacking work so that the steel guide beam is on the pier, and then the horizontal correction jack is used to push the fixed plate to move horizontally to achieve the purpose of correction, and this operation is repeated to put the steel guide beam on the pier, and the above operation is repeated until the beam is dropped to the designed elevation.

[0017] Preferably, for the steel box girder located in the curved section, the steel box girder is assembled at the bridge position, the formwork is erected, and the bridge deck is cast: a support bracket is erected above the transverse triangular support, the second corbel is installed on the side of the side main beam, the vertical support steel pipe is welded above the second corbel, a groove is reserved for the vertical support steel pipe, a double row of channel steel is arranged on the top of the support bracket, the double row of channel steel is laid parallel to the horizontal connection direction, and the grooves of the double row of channel steel and the vertical support steel pipe correspond to each other; an adjustable bracket is fixedly arranged above the horizontal connection, a support bottom rod is erected above the adjustable bracket, the double channel steel and the support bottom rod are connected by a pull rod, and tightened with a nut to form a suspension system; then square timber is laid in a direction perpendicular to the support bottom rod, the formwork of the bridge deck is laid above the square timber, and the bridge deck is cast.

[0018] A steel-concrete composite beam ramp bridge is obtained by any of the above-mentioned construction methods for the steel-concrete composite beam ramp bridge.

[0019] The beneficial effects of the present invention are:

[0020] 1) The present invention adopts an adjustable stand device for steel box girders to solve the cross slope change of the curved bridge deck; a positioning adjuster is arranged on the top of the temporary pier to improve the positioning accuracy of the steel box girder.

[0021] 2) The present invention adopts internal triangular supports and transverse triangular supports to temporarily reinforce the steel box girder segments, thus avoiding the problem of deformation of the steel box girder during hoisting; the prefabricated bridge deck is hoisted onto the main beam with the aid of a drop bracket, thus improving the placement accuracy of the bridge deck and accelerating the construction speed of the ramp bridge.

[0022] 3) The present invention adopts variable height steel guide beam technology, and realizes the curved jacking of large span narrow steel box beam without temporary piers through the horizontal jack and vertical jack at the front end of the guide beam.

[0023] 4) The present invention adopts both cast-in-place bridge deck support technology and support-free technology, and utilizes the original transverse triangular support of the steel box girder and the vertical support steel pipe and double-jointed channel steel support and suspension support bottom rod as temporary supports to form a suspension system. By laying the formwork on the suspension system, the problem of difficult formwork support for narrow box-type steel box girders is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall assembly of the steel box girder and the bridge deck;

[0025] Figure 2 It is a three-dimensional diagram of the steel box girder gantry;

[0026] Figure 3 It is a structural diagram of the landing bracket;

[0027] Figure 4 yes Figure 3 A magnified structural diagram of the middle A area;

[0028] Figure 5 It is a three-dimensional diagram of temporary internal support reinforcement of segmental steel box girder;

[0029] Figure 6 Elevation drawing of temporary pier top positioning and adjustment;

[0030] Figure 7 It is a side view of the temporary pier top positioning adjustment;

[0031] Figure 8 This is the front view of the detailed structure of the positioning adjuster;

[0032] Fig. 9 This is the side view of the detailed structure of the positioning adjuster

[0033] Fig.10 It is the side view of the steel guide beam curve push-up;

[0034] Fig.11 It is the structural diagram of the cast-in-place bridge deck with suspension system and support.

[0035] Explanation of the reference numerals: 1. Steel box girder; 2. Stand; 3. Expansion bolt; 4. Prefabricated bridge deck; 5. Position bracket; 6. Adjustable stand; 7. Inner steel pipe; 8. Outer steel pipe; 9. Fixing bolt; 10. Connecting square steel; 11. Horizontal connecting stand; 12. Side main beam stand; 13. Bottom plate; 14. Docking bayonet device; 15. U-shaped buckle; 16. Fastening bolt; 17. Thin steel pipe; 18. Thick steel pipe; 19. Steel pipe length adjustment nut; 20. Embedded joint; 21. Spring; 22. Telescopic buckle; 23. Telescopic head; 24. Limit block; 25. Fixing plate; 26. Top plate; 27. Slot; 28. Diagonal brace; 29. ​​Horizontal brace; 30. Horizontal connection; 31. Side main beam; 32. Embedded plate; 33. Triangle inside the box Support; 34. Horizontal triangular support; 35. Positioning adjuster; 36. Crossbeam; 37. Temporary pier; 38. Channel steel; 39. Steel pipe column; 40. First corbel; 41. Double limit plate; 42. Second beam; 43. Base; 44. Top plate; 45. Guide column; 46. Slide rod; 47. Limit block; 48. Hydraulic cylinder; 49. Steel guide beam; 50. Steel guide beam end; 51. Horizontal correction jack; 52. Vertical jack; 53. Pad; 54. Fixed plate; 55. Push pier; 56. Push system; 57. Second corbel; 58. Vertical support steel pipe; 59. Double channel steel; 60. Pull rod; 61. Nut; 62. Adjustable bracket; 63. Support bracket; 64. Support bottom rod; 65. Square wood. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0037] Embodiment 1

[0038] As an example, Figures 1 to 10 As shown, the construction method of the steel-concrete composite beam ramp bridge includes the following steps:

[0039] Step 1: Assemble the segmental steel box girder: After assembling the stand 2, fix the stand to the ground with expansion bolts 3, weld the components of the steel box girder 1 on the stand 2, complete the assembly of the segmental steel box girder 1, and then weld the transverse triangular support 34 composed of the diagonal brace 28 and the transverse brace 29 and the inner triangular support 33 to the embedded plate 32 on the steel box girder 1, and complete the temporary inner support reinforcement of the steel box girder. Figure 5 shown.

[0040] Step 2: Installation of prefabricated bridge deck: Install the prefabricated bridge deck 4 on the straight section steel box girder 1 for overall hoisting. Use a gantry crane to lift the prefabricated bridge deck 4, fix the landing bracket 5 to the side of the side main beam 31, and when the prefabricated bridge deck 4 falls, insert the embedded joint 20 into the top of the landing bracket 5, and then adjust the length of the landing bracket 5. Cooperate with the gantry crane to slowly fall and adjust the direction of the prefabricated bridge deck 4 until it falls on the top of the steel box girder 1. Figure 1 shown.

[0041] Step 3: Positioning of steel box girder: transport the steel box girder 1 to the bridge construction site, hoist it and place it on the temporary pier 37, and accurately adjust it to the designed elevation and inclination angle through the positioning adjusters 35 at the bottom and sides until the monitoring data requirements are met.

[0042] Step 4: Guide beam installation: After the segmental steel box girder 1 is assembled, the root of the steel guide beam 49 formed by connecting two groups of longitudinal beams through a cross beam is connected to the steel box girder 1 by full penetration welding. The ends of the two groups of longitudinal beams of the steel guide beam 49 are designed to be stepped, and vertical jacks 52 and horizontal correction jacks 51 are installed at the ends 50 of the steel guide beam to facilitate lifting when passing the pier.

[0043] Step 5: Pushing construction: Use the pushing system 56 to raise the lifting cylinder until the beam is separated from the beam adjustment support, open the pushing cylinder, and move the steel box beam 1 and the upper sliding structure forward as a whole. When the steel guide beam 49 contacts the front pushing pier, use the vertical jack 52 to lift over the pier. The vertical jack 52 contacts the pad 53 to lift the steel guide beam 49 onto the pier. Then use the horizontal correction jack 51 to push the fixed plate 54 to move horizontally to achieve the correction purpose. Repeat this operation to put the steel guide beam on the pier. Repeat the above operation until the beam is dropped to the designed elevation. Fig.10 shown.

[0044] Step 6: Casting of bridge deck: After the curved steel box girder is assembled at the bridge location, the formwork is set up and the bridge deck is cast. The second corbel 57 is set up on the side of the side main beam 31, and the vertical support steel pipe 58 is set up on the second corbel 57. Then, the double-jointed channel steel 59 and the tie rod 60 are used to set up the suspension formwork system. The horizontal triangular support 34 is retained, and the upper part thereof is set up with a support bracket 63 to support the suspension formwork system. A number of adjustable brackets 62 are arranged side by side above the cross-joint to support the formwork system. After the formwork is set up, concrete is poured. Fig.11 shown.

[0045] Embodiment 2

[0046] As another embodiment, this embodiment 2 proposes a more specific steel-concrete composite beam ramp bridge construction method based on the embodiment 1:

[0047] In step 1, specifically, Figure 2As shown, the pedestal 2 includes an adjustable pedestal 6 and a connecting square steel 10, wherein the adjustable pedestal 6 is composed of an inner steel pipe 7 and an outer steel pipe 8, the outer steel pipe 8 is inserted into the inner steel pipe 7, and the inner and outer steel pipes are fixed to a certain length using fixing bolts 9 to adapt to the change of the cross slope of the curved bridge deck and the shape of the steel box girder. The adjustable pedestal 6 is welded on the top of the bottom plate 13, and the connecting square steel 10 is welded to adjacent adjustable pedestals 6 to form a cross-connected pedestal 11. Several adjustable pedestals 6 are welded on the top of the bottom plates 13, and connected to form a side main beam pedestal 12 with connecting square steel 10, which is distributed on both sides of the cross-connected pedestal 11.

[0048] In step 2, specifically, Figure 3 As shown, the landing bracket 5 includes a docking bayonet device 14, a thin steel pipe 17, a thick steel pipe 18, a steel pipe length adjustment nut 19, a U-shaped buckle 15 and a fastening bolt 16. The steel pipe length adjustment nut 19 connects the thin steel pipe 17 and the thick steel pipe 18. The docking bayonet device 14 is installed on the top of the thin steel pipe 17, and the U-shaped buckle 15 is connected to the bottom of the thick steel pipe 18. The U-shaped buckle 15 is installed with fastening bolts 16 above and below.

[0049] The top plate of the docking bayonet device 14 is installed on the top of the thin steel pipe 17, a slot 27 is installed on one side of the top plate, and telescopic heads 23 are installed on both sides of the top of the slot 27. Limiting blocks 24 are set on both sides of the telescopic head 23 to prevent the telescopic head 23 from falling off. The bottom of the embedded joint 20 of the docking bayonet device 14 is installed on the prefabricated bridge deck 4, and a symmetrical fixing plate 25 is set on the top of the embedded joint 20. A spring 21 is set on the fixing plate 25, and the spring 21 is connected to the telescopic buckle 22. After the embedded joint 20 docks with the slot 27, the telescopic buckle 22 is stuck in the groove of the slot 27, and is pushed by the telescopic heads 23 on both sides of the slot 27 to push the telescopic buckle 22 out of the groove, separating the embedded joint 20 and the slot 27.

[0050] In step three, specifically, Figure 6 and Figure 7 As shown, the steel pipe column 39 is used as a column, and adjacent steel pipe columns 39 are connected by channel steel 38 to form a temporary pier 37. A crossbeam 36 is arranged on the top, and a secondary beam 42 is connected between the crossbeams 36. A first corbel 40 is arranged on the lower side of the crossbeam 36 for reinforcement, and double limit plates 41 are arranged on both sides of the crossbeam 36. The positioning adjuster 35 is arranged next to the double limit plate 41 and the pad on the crossbeam 36.

[0051] Wherein the positioning adjuster 35 is as follows Figure 8 and Fig. 9 As shown, it includes a base 43, a guide column 45, a hydraulic cylinder 48, a limit block 47, a slide rod 46 and a top plate 44. The hydraulic cylinders 48 are installed on both sides of the base 43, and the top plate 44 is installed on the top of the hydraulic cylinder 48. Limit blocks 47 are set at the front and back of the center of the top plate 44, and guide columns 45 are set at the front and back of the center of the base 43. The slide rod 46 passes through the limit blocks 47 and the guide columns 45 on both sides to form a rotating shaft.

[0052] In step five, specifically, a number of pads 53 are set on the jacking pier 55, a number of fixing plates 54 are fixed on the pads 53, and a number of vertical jacks 52 and horizontal deviation correction jacks 51 are set below the step of the end 50 of the steel guide beam.

[0053] In step six, specifically, Fig.11 As shown, a support bracket 63 is set up above the horizontal triangular support 34, and the second corbel 57 is installed on the side of the side main beam 31. A vertical support steel pipe 58 is welded above the second corbel 57, and a groove is reserved for the vertical support steel pipe 58. Double-row channel steels 59 are laid parallel to the direction of the horizontal link 30 and placed on the top of the support bracket 63 and the groove of the vertical support steel pipe 58. The pull rod 60 connects the double-jointed channel steel 59 and the support bottom rod 64, and is tightened with a nut 61 to form a suspension system. The adjustable bracket 62 is fixed above the horizontal link 30, and the support bottom rod 64 is set up above the adjustable bracket 62. Then, the square wood 65 is laid perpendicular to the direction of the support bottom rod 64, and the template is laid above the square wood 65.

[0054] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0055] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for a steel-concrete composite beam ramp bridge, characterized in that: The following steps are involved: Step 1: After assembling the bench, complete the assembly of the segmental steel box girder on the bench; Step 2: fix the positioning bracket to the side of the steel box girder, connect the prefabricated bridge deck to the top of the positioning bracket, shorten the positioning bracket, and synchronously place the prefabricated bridge deck on the top of the steel box girder with the gantry crane; Step 3: Positioning of steel box beam: transport the steel box beam to the temporary pier at the bridge construction site. The temporary pier adjusts the pre-steel box beam to the designed elevation and inclination angle through the positioning adjuster; Step 4: Guide beam installation: connect the segmental steel box beam to the steel guide beam. The end of the steel guide beam is in an inverted step shape and vertical jacks and horizontal deviation correction jacks are installed; Step 5: Jacking construction: Use the jacking system to jack up the steel box girder, open the jacking cylinder to move the steel box girder forward as a whole, and use the vertical jack to lift the steel guide beam over the pier at the jacking pier.

2. The construction method of the steel-concrete composite beam ramp bridge according to claim 1 is characterized in that: The pedestal includes an adjustable pedestal and connecting square steels. A base plate is provided at the bottom of the adjustable pedestal, wherein the adjustable pedestal includes an inner steel pipe and an outer steel pipe. The outer steel pipe is inserted into the inner steel pipe, and the inner steel pipe and the outer steel pipe are fixed at a certain length by using fixing bolts to adapt to the changes in the cross slope of the curved bridge deck and the shape of the steel box girder; the adjustable pedestal is welded on the top of the base plate, and the connecting square steels are welded to adjacent adjustable pedestals to form a cross-connection pedestal and a side main beam pedestal; the side main beam pedestals are distributed on both sides of the cross-connection pedestal; the steel box girder includes a side main beam and a cross connection, the cross-connection pedestal is supported under the cross connection, and the side main beam pedestal is supported under the side main beam; an inner-box triangular support is provided in the side main beam, and a transverse triangular support is provided between the side main beams on both sides of the cross connection.

3. The construction method of the steel-concrete composite beam ramp bridge according to claim 1 is characterized in that: The landing bracket includes a docking bayonet device, a thin steel pipe, a thick steel pipe, a steel pipe length adjustment nut, a U-shaped buckle and a fastening bolt. The steel pipe length adjustment nut connects the thin steel pipe and the thick steel pipe. The thin steel pipe is arranged above the thick steel pipe. The docking bayonet device is installed on the top of the thin steel pipe. The bottom of the thick steel pipe is connected to the U-shaped buckle, and the U-shaped buckle is installed with fastening bolts above and below.

4. The construction method of the steel-concrete composite beam ramp bridge according to claim 3 is characterized in that: The top plate of the docking bayonet device is installed on the top of the thin steel pipe, a slot is installed on one side of the top plate, telescopic heads are installed on both sides of the top of the slot, and limit blocks are arranged on the outside of the telescopic heads; an embedded joint of the docking bayonet device is provided at the bottom of the prefabricated bridge panel, a symmetrical fixing plate is arranged at the bottom of the embedded joint, a spring is arranged on the outside of the fixing plate, and the spring is connected with a telescopic buckle; grooves matching the telescopic buckle are opened on the inner walls on both sides of the slot, and after the embedded joint is docked with the slot, the telescopic buckle is clamped in the groove of the slot; when the landing bracket and the prefabricated bridge panel are disassembled, the telescopic buckle is pushed out of the groove mouth by the telescopic heads on both sides of the slot to separate the embedded joint and the slot.

5. The construction method of the steel-concrete composite beam ramp bridge according to claim 1 is characterized in that: The temporary pier includes steel pipe columns. Adjacent steel pipe columns are connected by channel steel to form a temporary pier. A crossbeam is arranged on the top of the temporary pier. Secondary beams are connected between the crossbeams. A first corbel reinforcement is arranged on the lower side of the crossbeam. Double limit plates are arranged on both sides above the crossbeam. Positioning adjusters are arranged on the opposite surfaces of the double limit plates on both sides and on the crossbeam. Pads are also arranged on the crossbeam. The positioning adjuster is supported on the bottom and both sides of the steel box girder.

6. The construction method of the steel-concrete composite beam ramp bridge according to claim 5 is characterized in that: The positioning adjuster includes a base, a guide column, a hydraulic cylinder, a limit block, a sliding rod and a top plate. Hydraulic cylinders are installed on both sides above the base, and a top plate is installed on the top of the hydraulic cylinder. Limit blocks are set in the front and back of the center of the bottom surface of the top plate, and sliding rods are passed between the limit blocks. Guide columns are set in the front and back of the center of the base, and the sliding rods pass through the limit blocks and guide columns on both sides to form a rotating shaft of the top plate, and the top plate is against the surface of the steel box beam.

7. The construction method of the steel-concrete composite beam ramp bridge according to claim 1 is characterized in that: A number of pads and jacking systems are set up on the jacking pier, and a fixed plate is fixed on the pad. Vertical jacks and horizontal correction jacks are set under the step at the end of the steel guide beam. When the steel guide beam is lifted over the pier, the vertical jack contacts the pad to carry out the jacking work to put the steel guide beam on the pier, and then the horizontal correction jack is used to push the fixed plate to move horizontally to achieve the purpose of correction. This operation is repeated to put the steel guide beam on the pier, and the above operation is repeated until the beam is dropped to the designed elevation.

8. The construction method of the steel-concrete composite beam ramp bridge according to claim 2 is characterized in that: For the steel box girders located in the curved section, the steel box girders are assembled at the bridge location, the formwork is erected, and the bridge deck is cast: a support bracket is erected above the horizontal triangular support, the second corbel is installed on the side of the side main beam, the vertical support steel pipe is welded above the second corbel, a groove is reserved for the vertical support steel pipe, a double row of channel steel is arranged on the top of the support bracket, the double row of channel steel is laid parallel to the horizontal connection direction, and the grooves of the double row of channel steel and the vertical support steel pipe correspond to each other; an adjustable bracket is fixed above the horizontal connection, a support bottom rod is erected above the adjustable bracket, the double channel steel and the support bottom rod are connected by a pull rod, and tightened with nuts to form a suspension system; then square timber is laid in a direction perpendicular to the support bottom rod, the formwork of the bridge deck is laid on the square timber, and the bridge deck is cast.

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