A corbel-suspender combined structure and construction method for reinforcing PSC continuous beams

Abstract

The present invention belongs to the field of bridge reinforcement, and discloses a corbel-suspender combination structure and a construction method for reinforcing a PSC continuous beam, comprising fine-rolled threaded steel, shear-resistant steel pipes, pressure-bearing concrete struts, connecting plates, pressure-bearing plates, corbels, support frames, connecting blocks and hangers, wherein an upper chord is connected to a cable of the bridge via a hanger, two corbels are symmetrically distributed on both sides of a box beam of the bridge, and the two corbels are connected via a horizontally arranged fine-rolled threaded steel bar, which passes through the box beam, and the fine-rolled threaded steel bar located above is located in the pressure-bearing concrete strut. By reinforcing the PSC continuous box beam bridge, the continuous box beam bridge achieves an active reinforcement effect, provides a reasonable connection mode and force transmission path between the hanger and the main beam, overcomes the shortcomings of poor reinforcement effect of traditional reinforcement methods, can effectively improve the bending and shearing resistance of the main beam, reduce the downward deflection deformation of the main beam, and inhibit the development of cracks in the main beam.

Description

Technical Field

[0001] The present invention belongs to the field of bridge reinforcement, and in particular relates to a corbel-suspender combination structure and a construction method for reinforcing a PSC continuous beam. Background Art

[0002] With the development of the economy and society, my country's road traffic volume has grown rapidly, and the number of bridges has also continued to grow. However, the relatively low design load standard values ​​in previous specifications have led to relatively insufficient bearing capacity for a large number of bridges. Vehicle overloading also frequently occurs during actual bridge operation, posing a safety hazard that cannot be ignored. In view of the fact that current conventional bridge reinforcement methods still have some shortcomings in improving the bearing capacity of large-span prestressed concrete continuous box girder bridges, the present invention takes existing large-span prestressed concrete box girder bridges as research objects, collects and analyzes bridge diseases and design defects that lead to their insufficient bearing capacity, and designs a bracket-hanger combination structure and construction method for reinforcing PSC (PSC: prestressed reinforced concrete) continuous box girder bridges, making it more efficient, simple, safe and economical to improve the bearing capacity of PSC continuous box girder bridges. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a corbel hanger combined structure and construction method for reinforcing PSC continuous beams to solve the problems in the prior art. To achieve the above invention objectives, the technical solution adopted by the present invention is:

[0004] A construction method for a corbel-suspender assembly structure comprises the following steps:

[0005] Step 1: Survey and determine the required load-bearing capacity of the pre-reinforced bridge, and determine the required number, size, steel grade, and specific layout of each component;

[0006] Step 2: Determine the pre-tensioning force of the finished rolled threaded steel bars at each location, the installation sequence of the bracket-and-suspender assembly structure, and the tension of each suspender according to the stress conditions obtained in step 1;

[0007] Step 3: prefabricate the components of the corbel-suspender assembly structure according to the conditions of the components determined in step 1;

[0008] Step 4: According to the predetermined position and the size of the shear steel pipe, a hole is constructed in the box girder side plate of the box girder and the shear steel pipe is passed through. The pressure-bearing concrete support rod is cast on the outer formwork of the shear steel pipe above, and the formwork is removed after hardening;

[0009] Step 5: Process the contact surface between the predetermined position of the box girder side plate and the connecting plate to ensure that the friction coefficient meets the requirements;

[0010] Step 6: Pass the finished rolled threaded steel bar through the shear steel pipe and through the holes on the box girder side plate, the connection plate and the pressure plate, tension the finished rolled threaded steel bar according to the predetermined tension requirement, and anchor the corbel to the box girder side plate with a steel cable anchor;

[0011] Step 7: Use the connecting block bolts to connect the boom and the connecting block in sequence;

[0012] Step 8: Based on step 2, install the boom according to the design requirements and adjust the boom tension;

[0013] Step 9: Treat all steel components with anti-corrosion and anti-rust treatment.

[0014] A corbel-suspender combination structure includes a corbel, wherein the corbel includes a vertical upper chord, a horizontal lower chord and an inclined diagonal strut. The upper chord is connected to the cable of the bridge through a hanger. Two corbels are provided, symmetrically distributed on both sides of the box girder of the bridge. The two corbels are connected by horizontally arranged high-quality rolled threaded steel bars, which pass through the box girder. Two groups of high-quality rolled threaded steel bars are vertically arranged side by side, and the high-quality rolled threaded steel bars are located in the pressure-bearing concrete struts.

[0015] Furthermore, the two ends of the high-rolled threaded steel are connected to the corbel through an anchoring mechanism, and the anchoring mechanism includes a connecting plate, the high-rolled threaded steel passes through the connecting plate and is fixed to the pressure plate by a steel cable anchor, the pressure plate abuts the connecting plate, and the connecting plate is attached to the box girder side plate on the side of the box girder, the connecting plate on the high-rolled threaded steel located above is fixed to the end of the upper chord, and the connecting plate on the high-rolled threaded steel located below is fixed to the end of the diagonal support rod.

[0016] Furthermore, a horizontal extension is provided at the bottom of the diagonal brace, the bottom of the lower chord is fixedly connected to the top of the extension, the top of the lower chord is fixedly connected to the bottom of the upper chord, and the connecting plate on the finished rolled threaded steel bar located below is fixedly connected to the end of the extension.

[0017] Furthermore, the upper chord, the lower chord and the diagonal brace are all double-jointed I-beams, and the anchoring mechanism is located in the side grooves of the upper chord and the diagonal brace.

[0018] Furthermore, the structure of the corbel satisfies the following formula:

[0019]

[0020] where μ is the friction coefficient between the box girder side plate and the connecting plate, H is the vertical height between the top and bottom of the corbel, and L is the horizontal distance between the connecting plate on the top chord and the bottom of the boom.

[0021] Furthermore, the structure of the finish-rolled threaded steel bar satisfies the following formula:

[0022]

[0023] Where n is the number of high-pressure rolled rebars below, fy is the design tensile strength of the high-pressure rolled rebar, As is the cross-sectional area of ​​a single high-pressure rolled rebar, L is the horizontal distance between the connecting plate on the upper chord and the bottom of the hanger, H is the vertical height between the top and bottom of the corbel, and T is the design tension value of the hanger.

[0024] Furthermore, both ends of the finish-rolled threaded steel bar are respectively located in shear-resistant steel pipes, and the shear-resistant steel pipes are fixed on the box girder side plates on the side faces of the box girder.

[0025] Furthermore, a support frame is fixedly provided on the top of the upper chord, the top surface of the support frame is a wedge-shaped structure and is adapted to the lower surface of the box girder flange plate of the box girder, and the top surface of the support frame is attached to the lower surface of the box girder flange plate.

[0026] Furthermore, the bottom of the boom is connected to the connecting block via a connecting block bolt, and the connecting block is fixed to the top of the upper chord.

[0027] The present invention has the following beneficial effects: The present invention is a combined structure of a corbel and hanger for reinforcing a PSC continuous box girder bridge and a construction method. Through the reinforcement of the PSC continuous box girder bridge by fine-rolled threaded steel, shear-resistant steel pipes, pressure-bearing concrete struts, connecting plates, pressure-bearing plates, corbels, support frames and hangers, the continuous box girder bridge achieves the effect of active reinforcement, provides a reasonable connection method and force transmission path between the hanger and the main beam, overcomes the shortcomings of the traditional reinforcement method, and can effectively improve the bending and shear resistance of the main beam, reduce the deflection deformation of the main beam, and inhibit the development of cracks in the main beam. The fine-rolled threaded steel is passed through the shear-resistant steel pipe through the box girder side plate, which not only directly transmits the pre-tension of the fine-rolled threaded steel, but also effectively provides sufficient shear protection, avoiding shear damage of the fine-rolled threaded steel. The upper side plate of the box girder is under pressure by the pressure-bearing concrete struts, the lower side plate of the box girder is under tension by the fine-rolled threaded steel, and the box girder flange plate is supported by the support frame. The structural connection is firm, the local bearing capacity is enhanced, and local damage is reduced.

[0028] The machinery and materials involved in this invention are widely used in bridge construction, ensuring the practicality of this reinforcement method. The corbels, connecting plates, bearing plates, support frames, connecting blocks, and hangers are prefabricated and assembled in the factory for on-site installation, ensuring quality and significantly shortening construction schedules. The construction area is primarily located along the edges of the bridge deck, minimizing space requirements, preventing traffic interruptions, and minimizing impact on traffic, making it suitable for strengthening bridges with heavy traffic volumes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is the structural diagram of the PSC continuous box girder bridge along the bridge direction before the reinforcement of the first three spans;

[0031] Figure 3 This is the cross-section of the PSC continuous box girder bridge before reinforcement;

[0032] Figure 4 This is the bridge elevation of the suspension bridge system after reinforcement;

[0033] Figure 5 This is a partial enlarged view of the suspension bridge system after reinforcement;

[0034] Figure 6 It is a three-dimensional schematic diagram of the box girder segment after reinforcement;

[0035] Figure 7 It is a three-dimensional schematic diagram of the combined structure of the corbel and boom;

[0036] Figure 8 It is a schematic diagram of the boom and connecting block;

[0037] Figure 9 is a schematic diagram of the support frame;

[0038] Figure 10 It is a schematic diagram of the connecting plate and the pressure plate;

[0039] Figure 11 This is a schematic diagram of the anchoring of finished rolled threaded steel bars. DETAILED DESCRIPTION

[0040] The following is a combination of the embodiments of the present invention Figures 1-11 , the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0041] A construction method for a corbel-suspender assembly structure comprises the following steps:

[0042] Step 1: Consult the data and conduct actual measurements to obtain the bridge structure and defect conditions, and survey the required increase in the bearing capacity of the pre-reinforced bridge. This is used to determine the stress conditions of the suspension bridge towers or the arch ribs of the tied arch bridge, the finished rolled threaded steel bars 1, the shear-resistant steel pipes 2, the pressure-bearing concrete struts 3, the connecting plates 4, the pressure-bearing plates 5, the corbels 7, the support frames 8, and the hanger rods 11. This determines the required number, size, steel grade, and specific layout of each component.

[0043] Step 2: Determine the pre-tensioning force of the finished rolled threaded steel bar 1 at each part, the installation sequence of the bracket-suspender assembly structure, and the tension of each suspender according to the stress conditions obtained in step 1;

[0044] Step 3: Based on step 1 and taking into account the mechanical operation capacity of the construction site, the factory processes the suspension bridge tower or the arch rib segment of the tied arch bridge, processes the connecting plate 4, the pressure plate 5, the bracket 7, the support frame 8 and the connecting block 9, and welds and assembles them. The size of the drill hole 23 on the connecting plate and the pressure plate is determined by the diameter and amount of the finished rolled threaded steel bar 1, and the angle of the support frame 8 is determined by the inclination angle of the lower slope of the box girder flange plate 19;

[0045] Step 4: According to the predetermined position and the size of the shear steel pipe 2, a hole is constructed in the box girder side plate 20 and passed through the shear steel pipe 2. The pressure-bearing concrete support rod 3 is cast outside the upper shear steel pipe 2 between the two side plates of the box girder. After hardening, the formwork is removed;

[0046] Step 5: Process the contact surface between the predetermined position of the box girder side plate 20 and the connecting plate 4 to ensure that the friction coefficient meets the requirements;

[0047] Step 6: Hoist the welded assembled bracket 7 to the predetermined position, place the inclined surface of the support frame 8 close to the lower inclined surface of the box girder flange plate 19, pass the shear steel pipe 2 through the hole 23 of the connecting plate, pass the finished rolled threaded steel 1 through the inside of the shear steel pipe 2 through the hole 23 on the box girder side plate 20, the connecting plate and the pressure plate, tension the finished rolled threaded steel 1 according to the predetermined tensile force requirement, and anchor the bracket 7 to the box girder side plate 20 using the steel strand anchor 6;

[0048] Step 7: Use the connecting block bolts 10 to connect the boom 11 and the connecting block 9 in sequence;

[0049] Step 8: During the reinforcement process, the bridge structure system changes, resulting in a redistribution of the internal forces of the bridge structure. Therefore, the tension of the hanger 11 needs to be adjusted. According to step 2, the hanger 11 is installed according to the design requirements, and the tension of the hanger 11 is adjusted. Whether the tension of the hanger 11 is correct or not is an important factor affecting the reinforcement effect. A reliable method is required to measure the tension of the hanger 11 at each stage. If there is any deviation, it should be adjusted in time to avoid adverse effects on the bridge.

[0050] Step 9: All steel components are treated with anti-corrosion and anti-rust treatment, and the continuous beam bridge reinforcement is completed.

[0051] like Figures 1-11 The present invention also relates to a corbel-suspender combination structure, the purpose of which is to strengthen the PSC continuous beam. In addition to being suitable for the standard three-span PSC continuous box beam bridge with a single box and a single chamber, it is also suitable for PSC continuous box beam bridges of various structures including but not limited to: two-span beams, three-span beams, and multi-span beams, and box chamber types combined with single box and single chamber, single box and double chamber, single box and multiple chambers, and multiple boxes and multiple chambers.

[0052] For the convenience of description, the following is an example of a standard three-span continuous box girder bridge, which is a bridge structure of the prior art. Before reinforcement, the box girder 18 acts on the pier 16, the pier 16 acts on the foundation 17, and the foundation 17 acts on the foundation. The box girder 18, the pier 16 and the foundation 17 form a standard three-span continuous box girder bridge. In addition, the overall structure of the bridge also includes a cable 12 located above, the cable 12 is fixed on the bridge tower 13, and the bottom of the bridge tower 13 is connected to the pier 16 through a support support 15. The box girder 18 is a hollow structure, and its two side surfaces are box girder side plates 20, and the two sections at the top are respectively provided with box girder flange plates 19.

[0053] A corbel-suspender combination structure adopts the above-mentioned construction method, including a corbel 7, wherein the corbel 7 includes a vertical upper chord, a horizontal lower chord and an inclined diagonal strut, and the upper chord is connected to the cable 12 of the bridge through a hanger 11. Two corbels 7 are provided, symmetrically distributed on both sides of the box girder 18 of the bridge, and the two corbels 7 are connected by a horizontally arranged high-quality rolled threaded steel bar 1, which passes through the box girder 18. Two groups of high-quality rolled threaded steel bars 1 are vertically arranged side by side, and the high-quality rolled threaded steel bars 1 located on the upper side are located in the pressure-bearing concrete strut 3.

[0054] The corbel 7 is a triangular structure, with the upper chord, lower chord and diagonal brace fixedly connected in sequence. The hanger 11 is vertically arranged and located on the box girder 18 to provide lifting force. The present invention fixes the corbel 7 on the main girder (the girder body formed by several box girders 18 in the length direction of the bridge) by fine-rolled threaded steel 1. The hanger 11 transmits force to the main girder through the corbel 7, providing a reasonable connection method and force transmission path between the hanger and the main girder. The corbel 7 provides an upward lifting force to the main girder under the action of the hanger 11, thereby enhancing the main girder's anti-bending and anti-shearing capacity, reducing the main girder's downward deflection deformation, and inhibiting the development of main girder cracks. This corbel-hanger combined structure can make improving the bearing capacity of the PSC continuous box girder bridge more efficient, simple, safe and economical.

[0055] Furthermore, the two ends of the finished rolled threaded steel bar 1 are connected to the corbel 7 through an anchoring mechanism, and the anchoring mechanism includes a connecting plate 4. The finished rolled threaded steel bar 1 passes through the connecting plate 4 and is fixed to the pressure plate 5 through a steel cable anchor 6. The pressure plate 5 abuts the connecting plate 4. The connecting plate 4 is attached to the box girder side plate 20 on the side of the box girder 18. The connecting plate 4 on the upper finished rolled threaded steel bar 1 is fixed to the end of the upper chord, and the connecting plate 4 on the lower finished rolled threaded steel bar 1 is fixed to the end of the diagonal brace.

[0056] The device is used to drill holes 23 in the connecting plate 4 and the bearing plate 5 respectively for the threaded deformed steel bar 1 to pass through. The bearing plate 5 is in a "C" - shaped structure, forming a hollow part between it and the connecting plate 4, and squeezing the connecting plate 4 to facilitate the anchoring of the threaded deformed steel bar 1. The cable anchor 6 is a prior - art component used to anchor the end of the threaded deformed steel bar 1 on the bearing plate 5.

[0057] Further, a horizontal extension part is provided at the bottom of the diagonal brace. The top of the extension part is fixedly connected to the bottom of the lower chord, the top of the lower chord is fixedly connected to the bottom of the upper chord, and the connecting plate 4 on the threaded deformed steel bar 1 located below is fixedly connected to the end of the extension part.

[0058] Further, the upper chord, the lower chord and the diagonal brace are all double - spliced I - beams 21, and the anchoring mechanism is located in the side grooves of the upper chord and the diagonal brace.

[0059] Specifically, the corbel 7 is formed by welding three double - spliced I - beams 21 end to end. The three double - spliced I - beams 21 are the upper chord, the lower chord and the diagonal brace respectively.

[0060] Further, the structure of the corbel 7 satisfies the following formula:

[0061]

[0062] Where μ is the friction coefficient between the side plate 20 of the box girder and the connecting plate 4, H is the vertical height between the top and the bottom of the corbel 7, and L is the horizontal distance between the connecting plate 4 on the upper chord and the bottom of the suspender 11.

[0063] Further, the structure of the threaded deformed steel bar 1 satisfies the following formula:

[0064]

[0065] Where n is the number of the threaded deformed steel bars 1 below, fy is the design tensile strength of the threaded deformed steel bar 1, As is the cross - sectional area of a single threaded deformed steel bar 1, L is the horizontal distance between the connecting plate 4 on the upper chord and the bottom of the suspender 11, H is the vertical height between the top and the bottom of the corbel 7, and T is the design tensile force value of the suspender 11.

[0066] Further, both ends of the threaded deformed steel bar 1 are respectively located in the shear - resistant steel pipes 2, and the shear - resistant steel pipes 2 are fixed on the side plate 20 of the box girder 18 on the side of the box girder.

[0067] The bearing concrete strut 3 is formed by pouring concrete. The bearing concrete strut 3 is poured between the two shear - resistant steel pipes 2 located above to connect the side plates 20 of the box girder on both sides.

[0068] Furthermore, a support frame 8 is fixedly provided on the top of the upper chord, and the top surface of the support frame 8 is a wedge-shaped structure and is adapted to the lower surface of the box beam flange plate 19 of the box beam 18. The top surface of the support frame 8 is attached to the lower surface of the box beam flange plate 19.

[0069] The fine-rolled threaded steel bar 1 is then anchored to the box beam side plate 20 by means of a steel cable anchor 6 through the drilled hole 23 on the pressure plate 5. The support frame 8 is supported under the box beam flange plate 19, so that the corbel 7 and the box beam 18 become one.

[0070] The support frame 8 can be welded together by a number of angle steels 22 , and is wedge-shaped as a whole, adapted to the inclination angle of the box beam flange plate 19 .

[0071] Furthermore, the bottom of the boom 11 is connected to the connecting block 9 via a connecting block bolt 10, and the connecting block 9 is fixed to the top of the upper chord.

[0072] The reinforcement principle of the present invention is as follows: a shear-resistant steel tube 2 passes through a finely rolled threaded steel bar 1 and then through a hole in the box girder side plate 20. The finely rolled threaded steel bar 1 is connected to a corbel 7 via a connecting plate 4 and a pressure plate 5. The corbel 7 is anchored to the box girder side plate 20 using a steel cable anchor 6. A pressure-bearing concrete brace 3 is cast outside the upper shear-resistant steel tube 2 and attached to the box girder side plate 20. A support frame 8 and a connecting block 9 are welded to the corbel 7. The corbel 7 is connected to the bridge tower 13 via a suspender 11 and a cable 12. The bridge tower 13 is welded to the corbel at the bridge tower. The cable 12 is anchored to both ends of the box girder 18. Hanger 11 provides vertical lifting force to corbel 7, support frame 8 provides upward support force to box girder flange plate 19, lower fine-rolled threaded steel bar 1 bears the lower tension of corbel 7, pressure-bearing concrete strut 3 bears the upper pressure of corbel 7, friction between box girder side plate 20 and connection plate 4 offsets the vertical shear force at the end of corbel 7, and shear-resistant steel pipe 2 protects fine-rolled threaded steel bar 1 from shear damage. Due to the anchoring effect, box girder 18 is subjected to the vertical lifting force transmitted by corbel 7. Cable 12 deflects at the top of pylon 13, exerting pressure on pylon 13. Pylons 13 transmit the force to block 0 14 through the corbel at the pier. Block 0 14 transmits the force to the foundation through midpoint support 15, pier 16, and foundation 17. This design has a reasonable force transmission path and provides an effective method for connecting the hanger and main beam, making the structure firmly connected, enhancing local bearing capacity, reducing local damage, and subjecting the main beam to upward lifting force. This will enhance the bending and shear resistance of the main beam of the PSC continuous box girder bridge, reduce the downward deflection of the main beam, and inhibit the development of cracks in the main beam.

[0073] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A construction method of a corbel-suspender assembly structure, characterized in that: The following steps are involved: Step 1: Survey and determine the required load-bearing capacity of the pre-reinforced bridge, and determine the required number, size, steel grade, and specific layout of each component; Step 2, determining the pre-tensioning force of the fine-rolled threaded steel bar (1) at each part, the installation sequence of the bracket-suspender assembly structure, and the tension of each secondary suspension rod (11) based on the stress conditions obtained in step 1; Step 3: prefabricate the components of the corbel-suspender assembly structure according to the conditions of the components determined in step 1; Step 4: According to the predetermined position and the size of the shear-resistant steel pipe (2), a hole is constructed on the box girder side plate (20) of the box girder (18) and the shear-resistant steel pipe (2) is passed through, and the pressure-bearing concrete support rod (3) is cast on the outer formwork of the shear-resistant steel pipe (2) above, and the formwork is removed after hardening; Step 5: Processing the contact surface between the predetermined position of the box beam side plate (20) and the connecting plate (4) to ensure that the friction coefficient meets the requirements; Step 6: Pass the finished rolled threaded steel bar (1) through the inside of the shear-resistant steel pipe (2) through the hole on the box beam side plate (20), the connecting plate (4) and the drilled hole (23) of the pressure plate (5), tension the finished rolled threaded steel bar (1) according to the predetermined tension requirement, and anchor the bracket (7) to the box beam side plate (20) using the steel cable anchor (6); Step 7: Use the connecting block bolts (10) to connect the suspension rod (11) and the connecting block (9) in sequence; Step 8: Based on step 2, install the boom according to the design requirements and adjust the boom tension; Step 9: Treat all steel components with anti-corrosion and anti-rust treatment; The corbel-suspender combined structure comprises a corbel (7), wherein the corbel (7) comprises a vertical upper chord, a horizontal lower chord and an inclined diagonal brace, and is characterized in that: the upper chord is connected to a cable (12) of a bridge via a hanger (11), two corbels (7) are provided, symmetrically distributed on both sides of a box girder (18) of the bridge, the two corbels (7) are connected by a horizontally arranged fine-rolled threaded steel (1), the fine-rolled threaded steel (1) passes through the box girder (18), and two groups of the fine-rolled threaded steel (1) are vertically arranged side by side, and the fine-rolled threaded steel (1) located on the upper side is located in the pressure-bearing concrete brace (3); The two ends of the finished rolled threaded steel (1) are connected to the bracket (7) through an anchoring mechanism, and the anchoring mechanism includes a connecting plate (4), the finished rolled threaded steel (1) passes through the connecting plate (4) and is fixed to the pressure plate (5) through a steel cable anchor (6), the pressure plate (5) abuts the connecting plate (4), and the connecting plate (4) is attached to the box beam side plate (20) on the side of the box beam (18), the connecting plate (4) on the upper finished rolled threaded steel (1) is fixed to the end of the upper chord, and the connecting plate (4) on the lower finished rolled threaded steel (1) is fixed to the end of the diagonal support rod; The bottom of the suspension rod (11) is connected to the connecting block (9) via a connecting block bolt (10), and the connecting block (9) is fixed to the top of the upper chord.

2. A corbel-suspender assembly structure, using the construction method according to claim 1, comprising a corbel (7), wherein the corbel (7) comprises a vertical upper chord, a horizontal lower chord and an inclined diagonal brace, and is characterized in that: The upper chord is connected to the cable (12) of the bridge through a hanger (11); two brackets (7) are provided and symmetrically distributed on both sides of the box girder (18) of the bridge; the two brackets (7) are connected by a horizontally arranged fine-rolled threaded steel bar (1); the fine-rolled threaded steel bar (1) passes through the box girder (18); two groups of the fine-rolled threaded steel bars (1) are vertically arranged side by side, and the fine-rolled threaded steel bar (1) located on the upper side is located in the pressure-bearing concrete support rod (3).

3. The corbel boom assembly structure according to claim 2, characterized in that: The two ends of the finished rolled threaded steel (1) are connected to the bracket (7) through an anchoring mechanism, and the anchoring mechanism includes a connecting plate (4), the finished rolled threaded steel (1) passes through the connecting plate (4) and is fixed to the pressure plate (5) through a steel cable anchor (6), the pressure plate (5) abuts the connecting plate (4), and the connecting plate (4) is attached to the box beam side plate (20) on the side of the box beam (18), the connecting plate (4) on the upper finished rolled threaded steel (1) is fixed to the end of the upper chord, and the connecting plate (4) on the lower finished rolled threaded steel (1) is fixed to the end of the diagonal support rod.

4. The corbel boom assembly structure according to claim 3, characterized in that: A horizontal extension is provided at the bottom of the diagonal brace, the bottom of the lower chord is fixedly connected to the top of the extension, the top of the lower chord is fixedly connected to the bottom of the upper chord, and the connecting plate (4) on the finished rolled threaded steel bar (1) below is fixedly connected to the end of the extension.

5. The corbel boom assembly structure according to claim 3, characterized in that: The upper chord, the lower chord and the diagonal bracing rods are all double-jointed I-beams (21), and the anchoring mechanism is located in the side grooves of the upper chord and the diagonal bracing rods.

6. A corbel boom assembly structure according to any one of claims 3 to 5, characterized in that: The structure of the corbel (7) satisfies the following formula: Where μ is the friction coefficient between the box girder side plate (20) and the connecting plate (4), H is the vertical height between the top and bottom of the corbel (7), and L is the horizontal distance between the connecting plate (4) on the upper chord and the bottom of the suspender (11).

7. A corbel boom assembly structure according to any one of claims 3 to 5, characterized in that: The structure of the finished rolled threaded steel bar (1) satisfies the following formula: Where n is the number of the finished rolled threaded steel bars (1) below, fy is the designed tensile strength of the finished rolled threaded steel bars (1), As is the cross-sectional area of ​​a single finished rolled threaded steel bar (1), L is the horizontal distance between the connecting plate (4) on the upper chord and the bottom of the hanger (11), H is the vertical height between the top and bottom of the bracket (7), and T is the designed tensile value of the hanger (11).

8. The corbel boom assembly structure according to claim 2, characterized in that: Both ends of the finished rolled threaded steel bar (1) are respectively located in a shear-resistant steel pipe (2), and the shear-resistant steel pipe (2) is fixed on a box beam side plate (20) on a side of the box beam (18).

9. The corbel boom assembly structure according to claim 2, characterized in that: A support frame (8) is fixedly provided on the top of the upper chord, the top surface of the support frame (8) is a wedge-shaped structure and is adapted to the lower surface of the box beam flange plate (19) of the box beam (18), and the top surface of the support frame (8) is in contact with the lower surface of the box beam flange plate (19).

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