Automatic assembly method for prestressed concrete box girder reinforcing member

Abstract

The application provides a prestressed concrete box girder steel bar component automatic assembling method, which comprises the following steps: S1, bending a stirrup, one end of the stirrup is bent into a '' roof '' shape, and the other end is bent into a '' hook '' shape; S2, placing the stirrup and the longitudinal bar on the bending platform according to a set interval; S3, positioning the middle part of the stirrup corresponding to the steel bar mesh through a positioning member, and performing one-time bending by taking the lower edge of the positioning member as a bending point, and performing two-time bending by taking the upper edge of the positioning member as a bending point; and S4, making the lower edge of the web steel bar mesh and the two sides of the bottom plate steel bar mesh form an intersection through two web jig frames, and installing the longitudinal bar at the intersection between the web steel bar mesh and the bottom plate steel bar mesh. Through the optimized production mode of the steel bar mesh, the steel bar mesh is bent into a steel bar mesh sheet in the form of a steel bar mesh, the steel bar mesh is a planar structure, and then the steel bar mesh sheet is assembled into a steel bar cage in the form of splicing, so that the splicing efficiency is high, and the production efficiency of the steel bar cage can be greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of prefabricated beam reinforcement cages, and specifically relates to an automatic assembling method for steel reinforcement members of prestressed concrete box girders. Background Art

[0002] Box girder is a commonly used structural form in bridge engineering, whose cross-section includes a top plate, a web plate, a bottom plate, a flange plate and a cavity. The traditional tire frame for binding steel bars of box girders needs to be specially manufactured according to the size of the reinforcement cage of the box girder. The size of the tire frame is fixed and its width cannot be adjusted, so one tire frame can only correspond to one box girder. In addition, due to the shape limitation of the box girder, mechanical equipment is difficult to extend into the interior of the reinforcement cage for operation, all steps require manual participation, resulting in low automation degree and low binding efficiency of the tire mold.

[0003] Therefore, it is necessary to provide an improved technical solution addressing the above-mentioned deficiencies in the prior art. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and the present invention provides an automatic assembling method for steel reinforcement members of prestressed concrete box girders.

[0005] In order to achieve the above objective, the present invention provides the following technical solution: An automatic assembling method for steel reinforcement members of prestressed concrete box girders, comprising: Step S1, bending stirrups, wherein one end of the stirrup is folded back into an inverted U shape, and the other end is bent into an L shape; Step S2, placing the stirrups on a bending platform according to a set spacing, correspondingly placing longitudinal bars on the stirrups, and fixing the stirrups and the longitudinal bars to form a steel reinforcement mesh; Step S3, positioning the corresponding middle part of the stirrups on the steel reinforcement mesh through a positioning member, folding one side of the steel reinforcement mesh upward through a turning mechanism, performing a first bending with the lower edge of the positioning member as a bending point, continuing to fold the steel reinforcement mesh through the turning mechanism, performing a second bending with the upper edge of the positioning member as a bending point, bending the steel reinforcement mesh into an overlapping double-layer structure, and binding tie bars between the double-layer steel reinforcement meshes to form a steel reinforcement mesh sheet; Step S4, placing two web steel reinforcement mesh sheets on web tire frames, placing a bottom plate steel reinforcement mesh sheet on a bottom plate tire frame, enabling the two web tire frames to move relatively from both sides of the bottom plate tire frame, so that the lower edges of the web steel reinforcement mesh sheets intersect with both sides of the bottom plate steel reinforcement mesh sheet, and installing longitudinal bars at the intersection between the web steel reinforcement mesh sheets and the bottom plate steel reinforcement mesh sheet; Step S5, hoisting a top plate steel reinforcement mesh sheet above the web tire frames, enabling the upper edges of the web steel reinforcement mesh sheets to intersect with the top plate steel reinforcement mesh, and installing longitudinal bars at the intersection between the web steel reinforcement mesh sheets and the top plate steel reinforcement mesh sheet.

[0006] Preferably, the bending platform has a stepped upper surface, and a flipping frame is provided on the lower side of the bending platform. The height difference of the stepped surface above the bending platform is adapted to the thickness of the flipping frame. The flipping mechanism includes two sets of drive rods located on both sides of the flipping frame. Each drive rod assembly includes three drive rods, which are respectively hinged to the two ends and the center of the side of the tilting frame. The tilting angle of the tilting frame is limited by the extension and retraction length of the three drive rods. The width of the bending platform is adapted to the width of the flipping frame, and the other side of the drive rod is hinged to the side of the bending platform.

[0007] Preferably, the main body of the positioning component is a short column fixed on the positioning rod, with a stop bar extending from the upper end and middle of the short column to form an F-shaped structure, and the distance between the two stop bars on opposite sides being adapted to the thickness of the steel mesh; multiple positioning components are correspondingly fixed on the positioning rod, and the multiple positioning components on the positioning rod correspond one-to-one with multiple stirrups in the steel mesh.

[0008] Preferably, the lower stepped surface is provided with slides at both ends of the corresponding positioning rod on the side edge near the higher stepped surface, so as to slide in a square assembly perpendicular to the stirrup, and the slides are provided with telescopic rods corresponding to the positioning rods; A bending rod is provided on the side of the positioning rod away from the higher step surface. The distance between the bending rod and the short column is adapted to the diameter of the hoop. Lifting rods are provided at both ends of the bending rod to drive the bending rod to rise and fall along the plane parallel to the short column to limit the bending point of the hoop.

[0009] Preferably, the bending rod is provided with eccentric wheels at both ends, the eccentric wheels are respectively hinged to the ends of the lifting rod, and a drive motor corresponding to the eccentric wheels is provided on the side of the lifting rod; The bending rod is driven by a drive motor to bypass the upper stop bar during the second bend.

[0010] Preferably, a support rod is provided above the steel mesh at one end of the higher step surface, and the height of the support rod corresponds to the preset height of the other end of the steel mesh after bending, so as to limit the two ends of the steel mesh to be parallel to each other after bending.

[0011] Preferably, there are four longitudinal bars at the intersection of the web reinforcement mesh and the bottom slab reinforcement mesh, and the four longitudinal bars are respectively attached to the inner side of the four intersection points at the intersection. There are four longitudinal bars at the intersection of the web reinforcement mesh and the top slab reinforcement mesh, and the four longitudinal bars are respectively attached to the inner side of the four intersection points.

[0012] Preferably, the web plate jig is hinged to the hydraulic trolley, and a driving component is provided on the side of the hydraulic trolley away from the base plate jig to drive the web plate jig to flip toward the base plate jig. An inclined assembly surface adapted to the web of the precast beam is provided on the side of the web plate jig close to the base plate jig for fixing the web plate steel mesh.

[0013] Preferably, the web frame has multiple steel bar hooks corresponding to the web steel mesh, the middle of the steel bar hook is hinged to the web frame, one end of the steel bar hook extends out of the inclined assembly surface and is bent upward into an L-shaped hook body, and the web frame is provided with a stop block above the other end of the steel bar hook to limit the rotation angle of the steel bar hook.

[0014] Preferably, the inclined assembly surface of the web plate frame is provided with a plurality of corresponding steel bar hook assembly rods, and the steel bar hooks are hinged to any side of the assembly rods corresponding to the length direction of the bottom plate frame via hinge shafts; The hinge shaft is provided with a torsion spring corresponding to the rebar hook, so as to drive the rebar hook to stick to the stop block and maintain the tendency of the L-shaped hook body to extend out of the inclined assembly surface.

[0015] Beneficial effects: By optimizing the production method of steel mesh, steel mesh is formed by bending it. The steel mesh has a planar structure and can be produced by automatic binding or welding robots. After production, the steel mesh is bent into shape and then assembled into a steel cage by splicing. The structure is simple and the splicing efficiency is high, which can greatly improve the production efficiency of steel cages. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of the steel mesh welding in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of a single bending of the reinforcing mesh in a specific embodiment provided by the present invention; Figure 3 This is a schematic diagram of the secondary bending of the steel mesh in a specific embodiment provided by the present invention; Figure 4 for Figure 2 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the web reinforcement mesh splicing in a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the splicing of the top slab steel mesh in a specific embodiment provided by the present invention; Figure 7 is an assembly schematic view of the steel bar hook in the specific embodiment provided by the present invention; Figure 8 is Figure 6 is an enlarged schematic view of part B in.

[0017] In the figures: 1, bending platform; 2, stirrup; 3, turning frame; 4, longitudinal bar; 5, driving rod; 6, lifting rod; 7, positioning rod; 8, positioning member; 9, bending rod; 10, web jig frame; 11, driving member; 12, hydraulic trolley; 13, bottom plate jig frame; 14, web steel mesh; 15, bottom plate steel mesh; 16, steel bar hook; 17, top plate steel mesh; 18, assembling rod; 19, stop block; 20, stop rod; 21, eccentric wheel. Detailed Description of the Embodiments

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art belong to the protection scope of the present invention.

[0019] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and other terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which is only for facilitating the description of the present invention rather than requiring the present invention must be constructed and operated in a specific orientation, therefore it cannot be construed as a limitation to the present invention. The terms "connected" and "coupled" used in the present invention should be interpreted broadly. For example, they may be fixed connection or detachable connection; they may be directly connected or indirectly connected through intermediate components. Those skilled in the art can understand the specific meanings of the above terms according to specific situations.

[0020] The present invention will be described in detail below with reference to the accompanying drawings in combination with embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0021] As Figure 1-8 shown, an automatic assembling method for steel bar members of a prestressed concrete box girder comprises the following step S1: bending a stirrup 2, wherein one end of the stirrup 2 is folded back into an inverted U shape, the width of the inverted U-shaped structure is adapted to the thickness of the steel mesh, and the other end is bent into an L shape, the bending length is adapted to the thickness of the steel mesh, so that the stirrup 2 is enclosed into an annular shape after both ends are bent.

[0022] Step S2: Place stirrups 2 on the bending platform 1 at a set interval. Placement seats corresponding to both ends of the stirrups 2 can be set on the bending platform 1. The placement seats have placement grooves corresponding to the bending ends of the stirrups 2. The groove openings are adapted to the diameter of the stirrups 2, thereby limiting the position and angle of the stirrups 2. Place longitudinal bars 4 on the stirrups 2. Fix the stirrups 2 and longitudinal bars 4 to form a steel mesh. By presetting, place longitudinal bars 4 on both sides of the steel mesh after it is formed, so that adjacent steel meshes can be spliced ​​to form an intersection.

[0023] The longitudinal reinforcement 4 is automatically tied and fixed by an automatic welding robot or a binding robot to form a sheet-like steel mesh. To ensure positioning, a placement seat for the longitudinal reinforcement 4 can also be set.

[0024] Step S3: Position the steel mesh at the middle of the corresponding stirrup 2 using the positioning piece 8. The positioning piece 8 has a certain width and forms a bending limit for the part to be bent. The steel mesh is folded upward on one side by the flipping mechanism. The lower edge of the positioning piece 8 is used as the bending point for the first bend. The steel mesh is folded again by the flipping mechanism. The steel mesh passes around the positioning piece 8 and is bent a second time with the upper edge of the positioning piece 8 as the bending point, so that the steel mesh is bent into an overlapping double-layer structure. Then, tie the reinforcing bars between the double-layer steel mesh to form a steel mesh sheet.

[0025] In this application, only the web reinforcement mesh 14 of the steel cage can be manufactured using the above-mentioned corrections S1-S3, or both the bottom slab reinforcement mesh 15 and the top slab reinforcement mesh 17 can be manufactured using this method.

[0026] Step S4: Place two web plate steel mesh 14 on the web plate frame 10 and place the bottom plate steel mesh 15 on the bottom plate frame 13. By moving the two web plate frames 10 relative to each other from both sides of the bottom plate frame 13, the lower edge of the web plate steel mesh 14 and the two sides of the bottom plate steel mesh 15 intersect. Install longitudinal reinforcement 4 at the intersection between the web plate steel mesh 14 and the bottom plate steel mesh 15. Step S5: Hoist the top plate steel mesh 17 above the web plate frame 10 so that the upper edge of the web plate steel mesh 14 intersects with the top plate steel mesh. Install longitudinal reinforcement 4 at the intersection between the web plate steel mesh 14 and the top plate steel mesh 17.

[0027] In this embodiment, the web plate frame 10 is hinged to the hydraulic trolley 12, and the two hydraulic trolleys 12 are located on both sides of the base plate frame 13 respectively. Rollers are provided at the bottom so that they can move relative to each other, thereby achieving splicing.

[0028] The main body of the web plate frame 10 is a right trapezoid, with its inclined side being the side closest to the bottom plate frame 13. The bottom edge of the web plate frame 10 is hinged to the hydraulic trolley 12 on the side away from the bottom plate frame 13, so that the web plate steel mesh 14 can be placed on the side close to the bottom plate frame 13 by flipping. A driving component 11 is provided on the side of the hydraulic trolley 12 away from the bottom plate frame 13. The driving component 11 can be a hydraulic cylinder. The length of the web plate frame 10 is adapted to the length of the bottom plate frame 13. Correspondingly, multiple hydraulic cylinders are evenly distributed along the length of the web plate frame 10 to drive the web plate frame 10 to flip toward the bottom plate frame 13.

[0029] The inclined surface of the web plate jig 10 near the bottom plate jig 13 is an inclined assembly surface corresponding to the inclined angle of the web plate, so that the web plate steel mesh 14 can be quickly pushed to both sides of the bottom plate steel mesh 15 at a preset angle. Multiple steel bar hooks 16 extending into the web plate steel mesh 14 are arrayed on the web plate jig 10. The longitudinal bars 4 of the web plate steel mesh 14 are hooked by the steel bar hooks 16, thereby realizing the positioning of the web plate steel mesh 14 and ensuring stability during the assembly process.

[0030] The inclined assembly surface of the web plate jig 10 is provided with multiple corresponding rebar hooks 16 and assembly rods 18. The assembly rods 18 are located on the inclined assembly surface and on the plane where the web plate jig 10 is flipped. The multiple assembly rods 18 are evenly distributed along the length of the web plate jig 10 and are used for installing the rebar hooks 16. The side of the assembly rod 18 is provided with a hinge shaft extending along the length of the bottom plate jig 13, so that the rebar hooks 16 can be rotated downward to extend out of the inclined assembly surface or rotated upward to retract into the web plate jig 10. The rebar hooks 16 are hinged to either side of the assembly rod 18 in the length direction of the corresponding bottom plate jig 13 through the hinge shaft, so that they can be rotated out or retracted into the web plate jig 10.

[0031] The hinge shaft is equipped with a torsion spring corresponding to the rebar hook 16. The torsion spring generates a torque on the rebar hook 16 through its own elastic potential energy, thereby driving the end of the rebar hook 16 away from the bottom plate frame 13 to stick to the stop block 19 from bottom to top, thereby maintaining the tendency of the L-shaped hook body to extend out of the inclined assembly surface. In this way, after the rebar cage is lifted out, the rebar hook 16 is reset and can support the rebar mesh, thus facilitating the next use.

[0032] In the initial state, the base plate jig 13 is kept horizontal or near horizontal by the driving component 11, and then the web plate jig 10 is driven to flip towards the base plate jig 13. After the base plate jig 13 is flipped, it maintains the angle of the corresponding web plate, and the web plate steel bars are moved to both sides of the base plate steel bars for splicing by external force.

[0033] In an optional embodiment, the bending platform 1 has a stepped upper surface, which is bisected by two surfaces, a higher one and a lower one. A tilting frame 3 is provided on the lower side of the bending platform 1. The tilting frame 3 is a square truss. The height difference of the stepped surface above the bending platform 1 is adapted to the thickness of the tilting frame 3, so as to keep the stirrups 2 horizontal when they are placed. The tilting mechanism includes two sets of drive rods 5 located on both sides of the tilting frame 3. The drive rods 5 can be cylinders or hydraulic cylinders. Each set of drive rods 5 includes three drive rods 5. The three drive rods 5 are respectively hinged to the two ends and the center of the side of the tilting frame 3. The tilting angle of the tilting frame 3 is limited by the extension and retraction length of the three drive rods 5. The maximum tilting angle can be 95-100 degrees.

[0034] The width of the bending platform 1 is adapted to the width of the flipping frame 3. The other side of the drive rod 5 is hinged to the side of the bending platform 1. Only the piston part of the drive rod 5 is shown in the figure for illustration. In actual use, the height of the bending platform 1 can be increased to install the drive rod 5.

[0035] In an optional embodiment, the main body of the positioning member 8 is a short column fixed on the positioning rod 7. The short column is a solid column, and its angle is the same as the bending angle of the end of the web reinforcement. Of course, it can be perpendicular to the bending platform 1, which can be adjusted according to actual needs. The upper end and middle of the short column have a stop bar 20 extending out to form an F-shaped structure. The stop bar 20 points in the width direction of the bending platform 1. The distance between the two stop bars 20 on the opposite side is adapted to the thickness of the steel mesh. The lower stop bar 20 is used for the first bending limit, specifically located at the upper edge of the stirrup 2, while the upper stop bar 20 is used for the second bending limit. Multiple positioning members 8 are fixed on the positioning rod 7. The opening of the F-shaped structure points to the same side in the width direction of the bending platform 1. The multiple positioning members 8 on the positioning rod 7 correspond one-to-one with the multiple stirrups 2 in the steel mesh, so that multiple stirrups 2 can be bent and limited one-to-one.

[0036] In order to remove the positioning piece 8 after the steel mesh is formed, a sliding seat corresponding to both ends of the positioning rod 7 is provided on the side edge of the lower step surface near the higher step surface, so as to slide and assemble in a square perpendicular to the stirrup 2. By sliding away from the opening of the F-shaped structure, the stirrup 2 is disengaged. Conversely, after the stirrup 2 is placed, it slides towards the opening of the F-shaped structure to limit the stirrup 2. A telescopic rod corresponding to the positioning rod 7 is provided on the sliding seat. The telescopic rod can be a hydraulic cylinder or a pneumatic cylinder to drive the positioning rod 7.

[0037] A bending rod 9 is provided on the side of the positioning rod 7 away from the higher step surface. The bending rod 9 is used in conjunction with the flipping frame 3. The distance between the bending rod 9 and the short column is adapted to the diameter of the hoop. The bending rod 9 is provided with lifting rods 6 at both ends to drive the bending rod 9 to rise and fall along the plane parallel to the short column to limit the bending point of the hoop 2. When bending in this way, as the flipping frame 3 flips, the bending rod 9 moves upward to the same horizontal plane as the lower stop bar 20. The bending rod 9 limits the angle of bending in one go to the preset target, so as to avoid the hoop 2 bending away from the lower stop bar 20.

[0038] After the first bend is completed, the flipping frame 3 flips to 90 degrees, and then the bending rod 9 moves downward to the same horizontal plane as the upper stop bar 20. In order to limit the angle and position of the second bend, the bending rod 9 is provided with eccentric wheels 21 at both ends. The eccentric wheels 21 are hinged to the ends of the lifting rod 6. The ends of the lifting rod 6 are provided with the central shaft corresponding to the eccentric wheels 21. The side of the lifting rod 6 is provided with a drive motor corresponding to the eccentric wheels 21. The drive motor is assembled with the eccentric wheels 21 through gear meshing, so that the eccentric wheels 21 can be driven. The eccentric position of the bending rod 9 is the same as that of the stirrup 2. In this way, the bending rod 9 is pressed against the stirrup 2 during the second bend, and the driving motor drives the bending rod 9 to pass around the upper stop bar 20 during the second bend.

[0039] Specifically, the drive rod 5 continues to drive the tilting frame 3 to tilt to its limit. During this process, the eccentric wheel 21 drives the bending rod 9 to bypass the upper stop bar 20, thereby limiting the secondary bending point. The eccentric wheel 21 continues to rotate, causing the steel mesh to continue to bend and form under gravity and pulling force. The drive rod 5 can drive the tilting frame 3 to reset.

[0040] In an optional embodiment, to prevent the steel mesh from bending excessively under gravity, a support rod is provided above the steel mesh at one end of the higher step surface. There can be multiple support rods. The height of the support rod corresponds to the preset height of the other end of the steel mesh after bending, so as to limit the two ends of the steel mesh to be parallel to each other after bending. Support seats corresponding to the support rods are provided on both sides of the steel mesh. After bending is completed and the tie rods are tied, the support rods can be pulled out.

[0041] In one optional embodiment, four longitudinal bars 4 are used at the intersection of the web reinforcement mesh 14 and the bottom slab reinforcement mesh 15. The four longitudinal bars 4 are respectively attached tightly to the inner side of the four intersection points, and then the inserted longitudinal bars 4 are tied or welded for fixation. Similarly, four longitudinal bars 4 are used at the intersection of the web reinforcement mesh 14 and the top slab reinforcement mesh 17. The four longitudinal bars 4 are respectively attached tightly to the inner side of the four intersection points, and then the inserted longitudinal bars 4 are tied or welded for fixation.

[0042] A limiting block can be installed above the web frame 10. The limiting block can be fixed with bolts to support the top plate steel mesh 17.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention shall be within the scope of protection of the pending claims of the present invention.

Claims

1. An automatic assembly method for reinforcing steel components of a prestressed concrete box girder, characterized in that, Comprising: Step S1: bending a stirrup, wherein one end of the stirrup is folded back into an inverted U shape, and the other end is bent into a rightward hooked right angle shape; Step S2: placing stirrups at a set spacing on a bending platform, correspondingly placing longitudinal bars on the stirrups, and fixing the stirrups and the longitudinal bars to form a reinforcement mesh; Step S3: positioning the corresponding middle portion of the stirrups on the reinforcement mesh via positioning members, flipping one side of the reinforcement mesh upward by a flipping mechanism, performing a first bending with the lower edge of the positioning members as bending points, continuing to flip the reinforcement mesh by the flipping mechanism, performing a second bending with the upper edge of the positioning members as bending points, bending the reinforcement mesh into an overlapping double-layer structure, and binding tie bars between the double-layer reinforcement meshes to form reinforcement mesh sheets; Step S4: placing two web reinforcement mesh sheets on a web jig frame, placing a bottom plate reinforcement mesh sheet on a bottom plate jig frame, enabling the two web jig frames to move relatively from both sides of the bottom plate jig frame so that the lower edges of the web reinforcement mesh sheets intersect with both sides of the bottom plate reinforcement mesh sheet, and installing longitudinal bars at the intersection between the web reinforcement mesh sheets and the bottom plate reinforcement mesh sheet; Step S5: hoisting a top plate reinforcement mesh sheet above the web jig frames, enabling the upper edges of the web reinforcement mesh sheets to intersect with the top plate reinforcement mesh sheet, and installing longitudinal bars at the intersection between the web reinforcement mesh sheets and the top plate reinforcement mesh sheet; the bending platform has a阶梯-shaped upper surface, a flipping frame is provided on the lower side of the bending platform, the height difference between the upper step surfaces of the bending platform is adapted to the thickness of the flipping frame, and the flipping mechanism comprises two groups of driving rod groups respectively located on both sides of the flipping frame; Each driving rod group respectively comprises three driving rods, the three driving rods are respectively hinged to the two ends and the center of the side portion of the flipping frame, and the flipping angle of the flipping frame is defined by the telescopic lengths of the three driving rods; The width of the bending platform is adapted to the width of the flipping frame, and the other side of the driving rod is hinged to the side portion of the bending platform; the main body of the positioning member is a short column fixed on a positioning rod, stop rods protrude from the upper end and the middle portion of the short column to form an F-shaped structure, and the spacing between the sides, away from each other, of the two stop rods is adapted to the thickness of the reinforcement mesh sheet; a plurality of said positioning members are correspondingly fixed on the positioning rod, and the plurality of said positioning members on the positioning rod respectively correspond to the plurality of stirrups in the reinforcement mesh one by one.

2. The automatic assembly method for prestressed concrete box girder reinforcement components according to claim 1, characterized in that, Slide seats corresponding to both ends of the positioning rod are provided on the side edge of the lower step surface adjacent to the higher step surface, so as to be slidably assembled in a direction perpendicular to the stirrups, and a telescopic rod corresponding to the positioning rod is provided on the slide seat; A bending rod is provided on the side of the positioning rod away from the higher step surface, the spacing between the bending rod and the short column is adapted to the diameter of the stirrup, and lifting rods are provided at both ends of the bending rod to drive the bending rod to lift along a plane parallel to the short column so as to define the bending point of the stirrup.

3. The automatic assembly method for prestressed concrete box girder reinforcement components according to claim 2, characterized in that, Eccentric wheels are provided at both ends of the bending rod, the eccentric wheels are correspondingly hinged to the ends of the lifting rods, and a driving motor corresponding to said eccentric wheels is provided on the side portion of the lifting rod; the bending rod is driven by the driving motor to bypass the upper stop rod during the second bending.

4. The automatic assembly method for prestressed concrete box girder reinforcement components according to claim 1, characterized in that, a support rod is provided above the reinforcement mesh at the end corresponding to the higher step surface, the height of the support rod corresponds to the preset height of the other end of the reinforcement mesh after bending, so as to define that the two ends of the reinforcement mesh are parallel to each other after bending.

5. The automatic assembly method for prestressed concrete box girder reinforcement components according to claim 1, characterized in that, There are four longitudinal bars at the intersection of the web reinforcement mesh and the bottom slab reinforcement mesh, and the four longitudinal bars are respectively attached to the inner side of the four intersection points. There are four longitudinal bars at the intersection of the web reinforcement mesh and the top slab reinforcement mesh, and the four longitudinal bars are respectively attached to the inner side of the four intersection points.

6. The automatic assembly method for prestressed concrete box girder reinforcement components according to claim 1, characterized in that, The web plate jig is hinged to a hydraulic trolley. A drive unit is provided on the side of the hydraulic trolley away from the base plate jig to drive the web plate jig to flip towards the base plate jig. An inclined assembly surface adapted to the web of the precast beam is provided on the side of the web plate jig close to the base plate jig for fixing the web plate steel mesh.

7. The automatic assembly method for prestressed concrete box girder reinforcement components according to claim 6, characterized in that, The web frame has multiple steel bar hooks corresponding to the web steel mesh. The middle part of the steel bar hook is hinged to the web frame. One end of the steel bar hook extends out of the inclined assembly surface and is bent upward into an L-shaped hook. The web frame is provided with a stop block above the other end of the steel bar hook to limit the rotation angle of the steel bar hook.

8. The automatic assembly method for prestressed concrete box girder reinforcement components according to claim 7, characterized in that, The inclined assembly surface of the web plate frame is provided with multiple corresponding steel bar hook assembly rods. The steel bar hooks are hinged to any side of the assembly rods in the length direction of the bottom plate frame via hinge shafts. The hinge shaft is provided with a torsion spring corresponding to the rebar hook, so as to drive the rebar hook to stick to the stop block and maintain the tendency of the L-shaped hook body to extend out of the inclined assembly surface.

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