Box girder reinforcement assembling jig and assembling method

Abstract

The application provides a box girder steel bar assembling jig and assembling method, which comprises a main frame, telescopic supports and steel bar hooks, a plurality of steel bar hooks are arrayed on the assembling frame to support corresponding longitudinal bars on the outer side of the web plate of the girder steel bar cage; the middle part of the steel bar hook is hinged on the assembling frame, one end of the steel bar hook is bent upwards into an L-shaped hook body after extending out of the assembling frame, and the assembling frame is provided with a stopper corresponding to the other end of the steel bar hook to limit the rotation angle of the steel bar hook; a plurality of telescopic supports are arrayed on the assembling frame and are assembled to slide along the direction perpendicular to the assembling frame to pass through the web plate of the box girder steel bar cage and support the longitudinal bars on the inner side of the web plate. The steel bar hooks and the telescopic supports are arranged, the steel bar hooks are used to place the corresponding longitudinal bars on the outer side of the web plate of the steel bar cage, the telescopic supports can pass through the web plate of the steel bar cage and are telescopic, and the telescopic supports can support the longitudinal bars on the inner side of the web plate after extending into the inner side of the web plate, so that the longitudinal bars on the inner side are fixed.

Description

Technical Field

[0001] This invention belongs to the field of automated production technology of steel cages, specifically relating to a jig for assembling box girder steel bars and an assembly method. Background Technology

[0002] Box girders are a common structural form in bridge engineering, with a cross-section comprising a top slab, web, bottom slab, flanges, and a cavity. With the vigorous development of my country's transportation construction, box girder prefabrication technology has made significant progress through continuous innovation. Traditionally, the reinforcement bars for box girders are manually tied on a jig. Due to the shape limitations of the box girder, it is difficult for mechanical equipment to reach inside the reinforcement cage for operation, and excessive manual intervention results in low automation and low jig tying efficiency.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a box girder reinforcement assembly jig and assembly method.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A box girder reinforcement assembly frame, comprising:

[0007] The main frame is a U-shaped structure with assembly frames on both sides corresponding to the web of the box girder steel cage.

[0008] The rebar hooks are arranged in an array on the assembly frame to support the longitudinal bars corresponding to the outer side of the web of the beam rebar cage. The middle part of the rebar hook is hinged to the assembly frame. One end of the rebar hook extends out of the assembly frame and is bent upward into an L-shaped hook body. The assembly frame is provided with a stop block above the other end of the rebar hook to limit the rotation angle of the rebar hook.

[0009] Telescopic supports, an array of which are distributed on the assembly frame, are slidably assembled in a direction perpendicular to the assembly frame to support the longitudinal reinforcement on the inner side of the box girder through the web of the box girder reinforcement cage.

[0010] Preferably, the assembly frame is a square frame, and an assembly rod corresponding to multiple steel bar hooks is provided inside the assembly frame. The steel bar hooks are hinged to one side of the assembly rod in the length direction of the assembly frame via a hinge shaft.

[0011] The telescopic bracket is mounted on the other side of the assembly rod corresponding to the length direction of the assembled jig frame.

[0012] Preferably, 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.

[0013] Preferably, multiple telescopic brackets on the same assembly rod are hinged to the same slide rod, the slide rod is slidably assembled along the length of the assembly rod, and drive rods corresponding to the slide rods are provided at both ends of the assembly rod;

[0014] Multiple telescopic supports on the same assembly rod are fixedly connected to the same connecting rod at the ends away from the box girder reinforcement cage.

[0015] Preferably, the bottom of the main frame is provided with multiple limiting blocks corresponding to the longitudinal reinforcement bars on the outer side of the bottom plate of the box girder steel cage.

[0016] Preferably, multiple longitudinal bars corresponding to the bottom web of the box girder reinforcement cage are lifted by a gantry crane;

[0017] The gantry crane is a square truss corresponding to the web of the steel cage of the box girder. Hooks corresponding to the steel mesh are arrayed on the lower surface of the gantry crane. A lifting rod is connected to the top of the gantry crane by a hinge. A traveling beam is connected to the top of the lifting rod. The two ends of the traveling beam travel on guide rails extending along the width direction of the jig.

[0018] An angle adjustment device is provided between each of the lifting rods and the gantry crane to adjust the angle of multiple longitudinal bars in the web of the corresponding box girder steel cage.

[0019] Preferably, the angle adjustment device includes:

[0020] A half-gear, which is fixed to the overhead crane;

[0021] A drive gear is rotatably connected to the side of the lifting rod, and the drive gear meshes with the half gear and is driven by a first stepper motor;

[0022] The drive gear is smaller than a half gear.

[0023] Preferably, a lifting frame is provided below the gantry crane, the lifting frame is adapted to the shape of the gantry crane, a plurality of sliding holes corresponding to the hook are provided on the lifting frame, a limiting member corresponding to the hook is provided below the lifting frame, and an inverted V-shaped notch corresponding to the longitudinal rib is provided in the middle of the limiting member;

[0024] The gantry crane is equipped with multiple compression rods corresponding to the lifting frame, which drive the lifting frame to slide along the hook and press the longitudinal ribs into the hook portion of the hook.

[0025] A method for assembling box girder reinforcement bars, using any of the above-mentioned assembly jigs, includes the following steps:

[0026] Step S1: Place the corresponding longitudinal bars on the outer side of the web of the box girder reinforcement cage onto the reinforcement hooks of the assembly frame, and place the corresponding longitudinal bars on the outer side of the bottom plate of the box girder reinforcement cage at the bottom of the main frame.

[0027] Step S2: Place the prefabricated steel reinforcement cage inside the main frame and fix the outer side of the steel reinforcement cage to the corresponding longitudinal reinforcement.

[0028] Step S3: Drive the telescopic support to extend inward to the inner side of the web of the box girder reinforcement cage, place the corresponding longitudinal bars on the inner side of the web of the box girder reinforcement cage on the telescopic support, and fix the inner side of the reinforcement cage to the corresponding longitudinal bars to form a reinforcement cage.

[0029] Step S4: Retract the telescopic bracket to the outside of the assembly frame and hoist the steel cage to the next process.

[0030] Preferably, the steel reinforcement cage includes web stirrups and bottom stirrups distributed in a U-shape, and the web stirrups and bottom stirrups are fixedly connected at their intersections. The steel reinforcement cage is hoisted by a hanger, which includes a main rod and a positioning plate connected in an I-shape. The two ends of the main rod are provided with hooks corresponding to the upper ends of the web stirrups.

[0031] The positioning plate has a positioning protrusion in the middle, and the two ends of the positioning protrusion are inclined end faces corresponding to the web stirrups. The two sliding plates are slidably assembled along the length of the positioning plate. An inclined surface corresponding to the web stirrups is provided on the inner side of the sliding plate to clamp the inner steel bars of the web stirrups.

[0032] Beneficial effects: The installation of rebar hooks and telescopic supports allows for the placement of longitudinal bars on the outer side of the rebar cage web. The telescopic supports can pass through the rebar cage web and extend and retract. After extending into the inner side of the rebar cage web, they can support the inner longitudinal bars, thereby fixing them. This improves the existing rebar cage production method and achieves rapid production. Attached Figure Description

[0033] 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:

[0034] Figure 1 This is a schematic diagram of the installation of the outer longitudinal reinforcement in a specific embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the placement of the reinforcing steel frame in a specific embodiment provided by the present invention;

[0036] Figure 3This is a schematic diagram of the installation of the inner longitudinal reinforcement in a specific embodiment provided by the present invention;

[0037] Figure 4 This is a simplified structural diagram of the telescopic bracket after retraction in a specific embodiment of the present invention;

[0038] Figure 5 This is a simplified structural diagram of the overhead crane provided in a specific embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the overhead crane tilting in a specific embodiment provided by the present invention;

[0040] Figure 7 This is a simplified diagram of the hanger structure in a specific embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the installation of the telescopic bracket in a specific embodiment provided by the present invention;

[0042] Figure 9 This is a schematic diagram of the installation of the rebar hook in a specific embodiment provided by the present invention;

[0043] Figure 10 This is a simplified diagram of the positioning plate structure in a specific embodiment of the present invention.

[0044] In the diagram: 1. Main frame; 2. Overhead crane; 3. Telescopic support; 4. Rebar hook; 5. Main rod; 6. Positioning plate; 7. Slide plate; 8. Longitudinal reinforcement; 9. Rebar cage; 10. Lifting rod; 11. Half gear; 12. Drive gear; 13. Hook; 14. Lifting frame; 15. Pressing rod; 16. Limiting component; 17. Positioning protrusion; 18. Assembly rod; 19. Limiting column; 20. Drive rod; 21. Slide rod; 22. Connecting rod; 23. Stop block; 24. Sliding sleeve; 25. Strip groove. Detailed Implementation

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0046] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0047] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0048] like Figure 1-10 As shown, a box girder rebar assembly jig includes a main frame 1, a telescopic support 3, and rebar hooks 4. The main frame 1 has a U-shaped structure, and its length is adapted to the length of the box girder rebar cage. The rebar cage is assembled inside the main frame 1. Assembly frames are provided on both sides of the main frame 1, and the inclination angle of the assembly frames is adapted to the web of the box girder rebar cage. Multiple rebar hooks 4 are distributed in a square array on the assembly frames. The rebar hooks 4 are used to support the longitudinal bars 8 corresponding to the outer side of the web of the rebar cage.

[0049] The main body of the rebar hook 4 is a strip rebar. The middle part of the rebar hook 4 is hinged to the assembly frame to rotate in a plane perpendicular to the assembly frame. One end of the rebar hook 4 extends out of the assembly frame to place the longitudinal reinforcement 8. This end of the rebar hook 4 is bent upward into an L-shaped hook body. The other end of the rebar hook 4 is used to limit the rotation angle of the rebar hook 4. Specifically, a stop block 23 is provided on the assembly frame above the other end of the rebar hook 4. The stop block 23 is used to limit the rotation angle of the rebar hook 4, so that the longitudinal reinforcement 8 maintains relative stability after placement.

[0050] Multiple telescopic supports 3 are arranged in a square array on the assembly frame. The number of telescopic supports 3 in the longitudinal direction is matched with the number of longitudinal reinforcements 8 on the inner side of the web. The multiple telescopic supports 3 are slidably assembled in a direction perpendicular to the assembly frame and can extend and retract through the assembly frame and the web of the box girder reinforcement cage. Specifically, after the telescopic supports 3 pass through the web of the box girder reinforcement cage, they can support the longitudinal reinforcements 8 on the inner side of the web. After the inner longitudinal reinforcements 8 are installed, the telescopic supports 3 are retracted, so that the installed box girder reinforcements can be lifted away. During the lifting process, when the longitudinal reinforcements 8 pass through the upper reinforcement hooks 4, the reinforcement hooks 4 are driven to rotate to make way.

[0051] The assembly frame is a square frame made of I-beams, round steel or channel steel welded together. Inside the assembly frame, there are assembly rods 18 corresponding to multiple steel bar hooks 4. The assembly rods 18 are evenly distributed along the length of the main frame 1 and are adapted to the number of rows of steel bar hooks 4 or telescopic brackets 3 arranged longitudinally. Of course, in order to increase its strength, tie rods can also be connected between multiple assembly rods 18.

[0052] The rebar hook 4 is hinged to one side of the assembly rod 18 along the length of the corresponding assembly frame via a hinge shaft. Specifically, the assembly rod 18 has a hinge shaft extending from its side along the length of the corresponding assembly frame, and the rebar hook 4 has a corresponding hinge hole in the middle.

[0053] The telescopic bracket 3 is mounted on the other side of the assembly rod 18 along the length of the corresponding assembly frame. The two are located on opposite sides of the assembly rod 18 to avoid mutual movement interference.

[0054] In this embodiment, in order to facilitate the assembly of the next steel cage, a torsion spring corresponding to the steel hook 4 is provided on the hinge shaft. The torsion spring is sleeved on the hinge shaft, and the two ends of the torsion spring are respectively limited on the assembly rod 18 and the steel hook 4, so as to drive the steel hook 4 to stick to the stop block 23 and maintain the tendency of the L-shaped hook body to extend out of the inclined assembly surface. After the steel cage is lifted away, the torsion spring drives the steel hook 4 to reset, which facilitates the secondary placement of the longitudinal reinforcement 8.

[0055] In this embodiment, multiple telescopic brackets 3 on the same assembly rod 18 are correspondingly hinged to the same slide rod 21. The slide rod 21 is provided with a corresponding sliding sleeve 24 for each telescopic bracket 3. The sliding sleeve 24 is fixedly connected to the slide rod 21. The slide rod 21 is slidably assembled along the length direction of the assembly rod 18. The slide rod 21 is preferably made of square steel. A dovetail-shaped protrusion extending along its length direction is provided on one side of the slide rod 21 corresponding to the assembly rod 18, while a dovetail groove extending along the length direction of the assembly rod 18 is provided, thereby enabling slidable assembly. Drive rods 20 corresponding to the slide rod 21 are provided at both ends of the assembly rod 18. The drive rods 20 can be hydraulic cylinders. One end of the inner side of the reinforcing cage is provided with a limiting post 19 extending upward parallel to the assembly frame, which can be used to position the inner longitudinal reinforcement 8. Before being lifted away, the telescopic support 3 slides down as a whole to make way for the inner longitudinal reinforcement 8, so as to avoid the limiting post 19 and the longitudinal reinforcement 8 from moving and interfering during the retraction of the telescopic support 3. The ends of multiple telescopic supports 3 on the same assembly rod 18 away from the box girder reinforcing cage are fixedly connected to the same connecting rod 22. The connecting rod 22 is driven synchronously along the longitudinal extension of the same row by a hydraulic cylinder or electric cylinder along the continuous length direction of the telescopic support 3. The hydraulic cylinder is correspondingly hinged to the slide rod 21, and a hydraulic cylinder or electric cylinder is provided at both ends of the connecting rod 22.

[0056] In an optional embodiment, the bottom of the main frame 1 is provided with multiple limiting blocks corresponding to the outer longitudinal reinforcement 8 of the bottom plate of the box girder steel cage. The limiting blocks are distributed in a square array, and there is an upward-opening groove in the middle of the limiting block, so as to position the outer longitudinal reinforcement 8 of the bottom plate.

[0057] In an optional embodiment, the longitudinal reinforcement 8 corresponding to the bottom web and bottom plate of the box girder reinforcement cage are all lifted by a gantry crane 2. The gantry crane 2 is a square truss corresponding to the web of the box girder reinforcement cage, which is welded from square steel. The lower surface of the gantry crane 2 is arrayed with hooks 13 corresponding to the steel mesh, including a main body and a hook extending longitudinally. The hook of the hook 13 faces one side of the width direction of the main frame 1, so that multiple longitudinal reinforcement 8 can be lifted.

[0058] A lifting rod 10 is hinged to the top of the gantry crane 2. Multiple lifting rods 10 are evenly distributed along the length of the gantry crane 2 (main frame 1). The lifting rods 10 can be hydraulic rods. The upper end of each lifting rod 10 is fixedly connected to a traveling beam. Both ends of the traveling beam travel on guide rails extending along the width of the jig frame. These guide rails are positioned above the processing workshop, thus enabling the lifting and transport of the longitudinal reinforcement 8. The lower end of each lifting rod 10 is hinged to the upper surface of the gantry crane 2 via a hinge shaft extending along the length of the main frame 1.

[0059] Since the longitudinal reinforcement 8 corresponding to the web needs to be rotated by the gantry crane 2 for tilting distribution, and the longitudinal reinforcement 8 corresponding to the bottom plate needs to be placed horizontally, in order to meet the above requirements, an angle adjustment device is provided between each lifting rod 10 and the gantry crane 2 to adjust the angle of multiple longitudinal reinforcement 8 corresponding to the web of the box girder reinforcement cage.

[0060] Specifically, the angle adjustment device includes a half gear 11 and a drive gear 12. The half gear 11 is fixed to the upper surface of the gantry crane 2 by welding. The drive gear 12 is smaller than the half gear 11 and is rotatably connected to the side of the lifting rod 10. The drive gear 12 meshes with the half gear 11 and is driven by the first stepper motor. In the actual hoisting process, multiple lifting rods 10 are raised and lowered synchronously. During the angle adjustment process, the first stepper motors of multiple angle adjustment devices operate synchronously. Multiple lifting rods 10 and multiple first stepper motors can be connected to the same control panel.

[0061] In an optional embodiment, to further ensure the stability of the longitudinal reinforcement 8 during hoisting and rotation, a lifting frame 14 is provided below the gantry crane 2. The lifting frame 14 is adapted to the shape of the gantry crane 2, and is also a square truss or a square plate. The lifting frame 14 is provided with multiple sliding holes corresponding to the hooks 13. The gantry crane 2 is provided with multiple pressing rods 15 corresponding to the lifting frame 14, so that the lifting frame 14 can be driven to slide along the main body of the hook 13, thereby moving closer to or away from the hook. Below the lifting frame 14, there is a limiting member 16 corresponding to the hook 13. The limiting member 16 is plate-shaped, and the middle of the limiting member 16 is provided with an inverted V-shaped notch corresponding to the longitudinal reinforcement 8. So that when the lifting frame 14 is driven to slide along the hook 13 towards the hook, the V-shaped notch presses the longitudinal reinforcement 8 into the hook of the hook 13, thereby limiting the longitudinal reinforcement 8.

[0062] The inverted V-shaped notch is provided with anti-slip rubber corresponding to the longitudinal rib 8. The number of limiting parts 16 can be adapted to the number of hooks 13, or they can be set only at both ends of the longitudinal rib 8, or they can be distributed at intervals on the lifting frame 14.

[0063] In response to the above-mentioned steel reinforcement assembly jig, this application also provides a highly efficient assembly method, which specifically includes the following steps:

[0064] Step S1: Place the longitudinal reinforcement 8 corresponding to the outer side of the web of the box girder steel cage on the assembly frames on both sides of the main frame 1, limit the corresponding longitudinal reinforcement 8 by steel bar hook 4, and place the corresponding longitudinal reinforcement 8 corresponding to the outer side of the bottom plate of the box girder steel cage at the bottom of the main frame 1.

[0065] Step S2: Place the prefabricated steel reinforcement cage 9 inside the main frame 1, so that the outer steel reinforcement of the steel reinforcement cage 9 is close to the corresponding longitudinal reinforcement 8, and then fix the outer side of the steel reinforcement cage 9 and the corresponding longitudinal reinforcement 8 by binding or welding.

[0066] Step S3: Drive the telescopic support 3 to slide inward so that the telescopic support 3 extends out of the inner side of the web of the box girder reinforcement cage. Then place the corresponding longitudinal reinforcement 8 on the inner side of the web of the box girder reinforcement cage on the telescopic support 3. Fix the inner side of the reinforcement cage 9 to the corresponding longitudinal reinforcement 8 by welding or binding to form a reinforcement cage.

[0067] Step S4: Retract the telescopic bracket 3 to the outside of the assembly frame so that the telescopic bracket 3 will not interfere with the movement of the steel cage. Then, lift the steel cage to the next process so that detailed pipeline installation can be carried out.

[0068] In this embodiment, the top slab reinforcement mesh of the box girder reinforcement cage is processed separately, and the web and bottom slab stirrups are combined to form a reinforcement skeleton 9, which is then welded to the longitudinal reinforcement 8 to form a whole. The reinforcement skeleton 9 includes web stirrups and bottom slab stirrups distributed in a U-shape. The intersections of the web stirrups and bottom slab stirrups are first fixedly connected by welding or binding to ensure that the reinforcement skeleton 9 will not fall apart during hoisting or placement. In order to ensure the accuracy of the placement of the reinforcement skeleton 9, a hoisting frame is used to hoist the reinforcement skeleton 9. The hoisting frame includes a main rod 5 and a positioning plate 6 connected in an I-shape. The main rod 5 and the positioning plate 6 are connected by two hydraulic cylinders. The length of the main rod 5 is greater than the width of the main frame 1. Hooks corresponding to the upper ends of the web stirrups are provided at both ends of the main rod 5. The positioning plate 6 is located above the bottom plate stirrups. The positioning plate 6 has a positioning protrusion 17 in the middle. The two ends of the positioning protrusion 17 are inclined end faces corresponding to the web plate stirrups. The positioning protrusion 17 is adjusted longitudinally by a hydraulic cylinder to make the two ends of the positioning protrusion 17 fit tightly against the inner side of the inner reinforcement of the web plate stirrups. The positioning plate 7 is provided at both ends of the positioning plate 6. The sliding plate 7 is slidably assembled along the length of the positioning plate 6. The thickness of the sliding plate 7 is adapted to the positioning plate 6. The inner side of the sliding plate 7 has an inclined surface corresponding to the web plate stirrups and a groove corresponding to the inner reinforcement of the web plate stirrups to clamp the inner reinforcement of the web plate stirrups.

[0069] The sliding protrusion of the positioning plate 6 extends from the middle of the slide plate 7. The positioning plate 6 has strip grooves 25 corresponding to the sliding protrusion at both ends. The back of the positioning plate 6 is provided with hydraulic cylinders corresponding to the two slide plates 7. The hydraulic cylinders extend along the length of the positioning plate 6. The piston ends of the two hydraulic cylinders are respectively connected to the sliding protrusions of the two slide plates 7, thereby driving the slide plates 7.

[0070] The length of the positioning plate 6 extending beyond the positioning protrusions 17 at both ends is no greater than the width of the web. After clamping the inner steel bars of the web stirrups, the two ends of the positioning plate 6 will not extend beyond the sides of the steel cage 9, thus facilitating placement.

[0071] Positioning strips corresponding to the main rod 5 are provided above the assembly frames on both sides of the main frame 1. The positioning strips have notches distributed at intervals. These notches limit the two ends of the main rod 5. The notches correspond to the placement positions of multiple steel reinforcement cages 9.

[0072] 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. A type of rebar assembly frame for box girders, characterized in that, include: The main frame is a U-shaped structure with assembly frames on both sides corresponding to the web of the box girder steel cage. The rebar hooks are arranged in an array on the assembly frame to support the longitudinal bars corresponding to the outer side of the web of the box girder rebar cage. The middle part of the rebar hook is hinged to the assembly frame. One end of the rebar hook extends out of the assembly frame and is bent upward into an L-shaped hook body. The assembly frame is provided with a stop block above the other end of the rebar hook to limit the rotation angle of the rebar hook. Telescopic supports, an array of which are distributed on the assembly frame, the telescopic supports being slidably assembled in a direction perpendicular to the assembly frame to support the longitudinal reinforcement on the inner side of the box girder through the web of the box girder reinforcement cage; The longitudinal reinforcement bars corresponding to the web of the box girder reinforcement cage are lifted by a gantry crane; The gantry crane is a square truss corresponding to the web of the steel cage of the box girder. Hooks corresponding to the steel mesh are arrayed on the lower surface of the gantry crane. A lifting rod is connected to the top of the gantry crane by a hinge. A traveling beam is connected to the top of the lifting rod. The two ends of the traveling beam travel on guide rails extending along the width direction of the jig. An angle adjustment device is provided between each of the lifting rods and the gantry crane to adjust the angle of multiple longitudinal bars in the web of the corresponding box girder steel cage; The overhead crane is provided with a lifting frame below it. The lifting frame is adapted to the shape of the overhead crane. The lifting frame is provided with multiple sliding holes corresponding to the hook. The lifting frame is provided with a limiting member corresponding to the hook below it. The limiting member is provided with an inverted V-shaped notch corresponding to the longitudinal rib in the middle. The gantry crane is equipped with multiple compression rods corresponding to the lifting frame, which drive the lifting frame to slide along the hook and press the longitudinal ribs into the hook portion of the hook.

2. The box girder reinforcement assembly frame according to claim 1, characterized in that, The assembly frame is a square frame, and an assembly rod corresponding to multiple steel bar hooks is provided inside the assembly frame. The steel bar hooks are hinged to one side of the assembly rod in the length direction of the assembly frame via hinge shafts. The telescopic bracket is mounted on the other side of the assembly rod corresponding to the length direction of the assembled jig frame.

3. The box girder reinforcement assembly frame according to claim 2, characterized in that, The hinge shaft is provided with a torsion spring corresponding to the steel bar hook.

4. The box girder reinforcement assembly frame according to claim 2, characterized in that, Multiple telescopic brackets on the same assembly rod are correspondingly hinged to the same slide rod, the slide rod is slidably assembled along the length direction of the assembly rod, and drive rods corresponding to the slide rods are provided at both ends of the assembly rod; Multiple telescopic supports on the same assembly rod are fixedly connected to the same connecting rod at the ends away from the box girder reinforcement cage.

5. The box girder reinforcement assembly frame according to claim 1, characterized in that, The bottom of the main frame is equipped with multiple limiting blocks corresponding to the longitudinal reinforcement bars on the outer side of the bottom plate of the box girder steel cage.

6. The box girder reinforcement assembly frame according to claim 1, characterized in that, The angle adjustment device includes: A half-gear, which is fixed to the overhead crane; A drive gear is rotatably connected to the side of the lifting rod, and the drive gear meshes with the half gear and is driven by a first stepper motor; The drive gear is smaller than a half gear.

7. A method for assembling box girder reinforcement bars, comprising assembling using an assembly jig as described in any one of claims 1-6, characterized in that, Includes the following steps: Step S1: Place the corresponding longitudinal bars on the outer side of the web of the box girder reinforcement cage onto the reinforcement hooks of the assembly frame, and place the corresponding longitudinal bars on the outer side of the bottom plate of the box girder reinforcement cage at the bottom of the main frame. Step S2: Place the prefabricated steel reinforcement cage inside the main frame and fix the outer side of the steel reinforcement cage to the corresponding longitudinal reinforcement. Step S3: Drive the telescopic support to extend inward to the inner side of the web of the box girder reinforcement cage, place the corresponding longitudinal bars on the inner side of the web of the box girder reinforcement cage on the telescopic support, and fix the inner side of the reinforcement cage to the corresponding longitudinal bars to form a reinforcement cage. Step S4: Retract the telescopic bracket to the outside of the assembly frame and hoist the steel cage to the next process.

8. The method for assembling box girder reinforcement according to claim 7, characterized in that, The steel reinforcement cage includes web stirrups and bottom stirrups distributed in a U-shape. The web stirrups and bottom stirrups are fixedly connected at their intersections. The steel reinforcement cage is hoisted by a hanger. The hanger includes a main rod and a positioning plate connected in an I-shape. The two ends of the main rod are provided with hooks corresponding to the upper ends of the web stirrups. The positioning plate has a positioning protrusion in the middle, and the two ends of the positioning protrusion are inclined end faces corresponding to the web stirrups. The two sliding plates are slidably assembled along the length of the positioning plate. An inclined surface corresponding to the web stirrups is provided on the inner side of the sliding plate to clamp the inner steel bars of the web stirrups.

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