A super large steel bar net paving process for precast beam

Abstract

The application discloses a prefabricated beam super-large steel bar net paving process and relates to the technical field of prefabricated beam production. The process comprises the following steps: S1, steel bar net positioning, positioning the steel bar net on a finished product receiving rack through a positioning mechanism; S2, grabbing the steel bar net, moving a lifting tool above the steel bar net through a hoisting device, and then lowering the lifting tool to grab the steel bar net through the hoisting device. The lifting tool beam of the lifting tool is provided with hook claws with adjustable intervals, so as to grab the steel bar net with interval errors. The process has the beneficial effects that: the process improves the paving process of the steel bar net, sets the self-adapting hook claws in the paving process, solves the problem that the steel bar net with welding deviation is difficult to be grabbed in the prior art, realizes accurate grabbing of the steel bar net, and does not need manual auxiliary operation in the grabbing process, reduces the labor input, and is beneficial to realizing unmanned paving production of the steel bar framework.

Description

Technical Field

[0001] This invention relates to the field of precast beam production technology, and in particular to a process for laying ultra-large steel mesh in precast beams. Background Technology

[0002] In recent years, my country has actively promoted prefabricated modular buildings, aiming to reduce the demand for labor on construction sites through the industrialized production of building components in prefabrication plants. However, the level of automation in prefabrication plants is currently low, especially for infrastructure components, which, due to their large size and numerous manufacturing processes, still require a significant amount of labor. For bridge prefabrication components, the installation of the steel reinforcement framework is mainly done manually in the prefabrication plant, resulting in high labor costs.

[0003] In railway bridge engineering, precast components such as box girders require a large amount of steel reinforcement, which is characterized by its large size, quantity, and high installation precision. In recent years, steel mesh assembly has been widely adopted in the production of precast beam steel reinforcement cages to reduce the number of components and improve installation accuracy.

[0004] The formed steel mesh is quite large, making transportation and installation difficult. Therefore, our company designed and disclosed a special lifting tool and method for steel mesh of precast box girders for high-speed railways, with the publication number CN116812728A. By designing a special steel mesh lifting tool, the efficiency of transportation and installation is improved. The specific lifting steps include: first, laying the U-shaped steel bars of the bottom slab; then, lifting the bottom slab steel mesh using the steel mesh lifting tool; then, rotating the two wing beams upwards... and lifting the two cantilever top steel meshes separately using the lower lifting beam, and fixing the cantilever top steel meshes to the corresponding cantilever bottom outer steel meshes and the top slab top steel meshes.

[0005] After a period of use, some new problems were discovered: After the reinforcing mesh is produced, it is conveyed to the finished product receiving rack, awaiting grabbing and transfer by the lifting device. However, when the reinforcing mesh is conveyed to the receiving rack, its front and rear positions deviate to some extent, preventing the hooks from accurately grabbing it as designed. Manual assistance is required to allow the lifting device to grasp the mesh. Secondly, the extra-large reinforcing meshes are 32m long and 7m or 10m wide, etc. The reinforcing bars themselves have a certain degree of flexibility, and due to their length, some bars may exhibit slight bending or deformation. While slight bending and deformation are within a reasonable error range and do not affect the strength of the precast beam, bending causes changes in the spacing between the bars, ultimately preventing the hooks from properly grabbing the mesh. Forcibly wedging the hooks into the mesh can easily damage both the hooks and the mesh, causing deformation of the hooks. Furthermore, after the lifting device is released, the mesh cannot be properly separated from the device, failing to achieve the expected results. Summary of the Invention

[0006] The purpose of this invention is to provide a precast beam ultra-large steel mesh paving process in order to solve the above-mentioned problems.

[0007] The present invention achieves the above objectives through the following technical solutions: A process for laying ultra-large steel mesh in precast beams includes the following steps: S1. Rebar mesh positioning: The rebar mesh located on the finished product receiving rack is positioned by a positioning mechanism. S2. Grab the reinforcing mesh. The lifting equipment drives the lifting device to move above the reinforcing mesh, and then the lifting equipment controls the lifting device to descend and grab the reinforcing mesh. The lifting device has adjustable-spaced hooks on the lifting beam to grab the reinforcing mesh with spacing errors. S3. Transfer: The steel mesh grabbed is transferred to the binding platform using lifting equipment. S4. The lifting equipment adjusts the placement angle of the steel mesh according to its placement position. After the angle is adjusted, the steel mesh is placed in the preset position on the binding platform. S5. Tie and secure the steel mesh placed on the binding platform.

[0008] As a further improvement, in S1, the positioning mechanism includes a positioning rod, the middle position of which is hinged to the finished product receiving rack, and a connecting rod is hinged to the bottom of the positioning rod. The other end of the connecting rod is hinged to a positioning cylinder. When the steel mesh is positioned, the positioning cylinder extends, causing the upper end of the positioning rod to push the steel mesh back to the set position to complete the positioning. Afterward, the positioning cylinder retracts, causing the top of the positioning rod to descend to the bottom of the steel mesh, forming a clearance and preventing the steel mesh from colliding with the positioning rod.

[0009] As a further improvement, in S2, the hook includes a vertically arranged hollow rod, a hydraulic cylinder is fixedly installed inside the hollow rod, a limit block is hinged to the bottom of the hydraulic cylinder, and a through hole is opened on the side wall of the hollow rod for the limit block to pass through; when gripping, the hydraulic cylinder retracts, and the limit block extends to the outside of the hollow rod to limit the steel mesh to grip the steel mesh; when the hydraulic cylinder extends, the limit block retracts into the hollow rod so that the hook separates from the steel mesh; The top of the hollow rod is fixedly connected to an anti-rotation block, which has several anti-rotation surfaces. The anti-rotation block is hinged to a guide block, which is slidably mounted on the lifting beam in the up-down direction. An anti-rotation groove is provided below the anti-rotation block to prevent it from rotating.

[0010] As a further improvement, a guide groove is provided on the lifting beam, and the guide block is slidably assembled in the guide groove. A spring for driving the guide block to reset is also provided in the guide groove. When the hook is separated from the steel mesh, the spring drives the guide block to rise, so that the anti-rotation block separates from the anti-rotation groove.

[0011] As a further improvement, in S4, a positioning groove is provided on the binding platform for positioning the reinforcing mesh, and the reinforcing mesh on the binding platform is positioned by the positioning groove.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention improves the installation process of steel mesh by setting adaptive adjustable hooks during the installation process. This solves the problem of difficulty in grasping steel mesh with welding deviations in the prior art, and achieves precise grasping of steel mesh. Moreover, no manual assistance is required during the grasping process, which reduces labor input and is conducive to realizing unmanned installation and production of steel mesh skeletons. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a structural schematic diagram of the precast beam ultra-large steel mesh paving process described in this invention.

[0015] Figure 2 This is a schematic diagram of the positioning mechanism for the precast beam ultra-large steel mesh paving process described in this invention.

[0016] Figure 3 This is a schematic diagram of the hook claw structure of the precast beam ultra-large steel mesh paving process described in this invention.

[0017] Figure 4 This is a schematic diagram of the guide groove structure of the precast beam ultra-large steel mesh paving process described in this invention.

[0018] The annotations in the attached figures are explained as follows: 1. Finished product receiving rack; 2. Positioning mechanism; 21. Positioning cylinder; 22. Connecting rod; 23. Positioning rod; 3. Lifting device; 31. Hook; 32. Lifting device beam; 311. Hollow rod; 312. Limiting block; 313. Through hole; 314. Hydraulic cylinder; 315. Anti-rotation groove; 316. Anti-rotation block; 317. Guide groove; 318. Guide block; 319. Torsion spring; 320. Spring; 4. Reinforcing mesh. Detailed Implementation

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through the specific circumstances.

[0021] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-4 As shown, the precast beam ultra-large steel mesh laying process includes the following steps: S1. Positioning of steel mesh 4: The steel mesh 4 located on the finished product receiving rack 1 is positioned by the positioning mechanism 2. The positioning mechanism 2 includes a positioning rod 23, which is hinged to the finished product receiving rack 1 at its middle position. A connecting rod 22 is hinged to the bottom of the positioning rod 23, and a positioning cylinder 21 is hinged to the other end of the connecting rod 22. When the steel mesh 4 is positioned, the positioning cylinder 21 extends, causing the upper end of the positioning rod 23 to push the steel mesh 4 back to the set position to complete the positioning. After that, the positioning cylinder 21 retracts, causing the top of the positioning rod 23 to descend to the bottom of the steel mesh 4 to avoid collision with the positioning rod 23.

[0022] In this embodiment, since the finished product receiving rack 1 is located on the discharge side of the welding equipment for the steel mesh 4, the welded steel mesh 4 is directly discharged to the finished product receiving rack 1. The steel mesh 4 does not have any deviation in the width direction. Therefore, the positioning mechanism 2 is only set at the end of the finished product receiving rack 1. When not in use, the positioning mechanism 2 can be hidden at the bottom of the steel mesh 4 to prevent the steel mesh 4 from colliding with the positioning rod 23 and thus damaging the positioning cylinder 21.

[0023] S2. Grab the steel mesh 4. Drive the lifting device 3 to move above the steel mesh 4. Then, control the lifting device 3 to lower and grab the steel mesh 4. The lifting device 3 has adjustable claws 31 on the lifting beam 32 to grab the steel mesh 4 with interval errors. Except for the claws 31, the structure of the lifting device 3 has not been improved. The hook 31 includes a vertically arranged hollow rod 311 with a hemispherical bottom. A hydraulic cylinder 314 is fixedly installed inside the hollow rod 311. A limit block 312 is hinged to the bottom of the hydraulic cylinder 314. A through hole 313 is provided on the side wall of the hollow rod 311 for the limit block 312 to pass through. When gripping, the hydraulic cylinder 314 retracts, and the limit block 312 extends to the outside of the hollow rod 311 to limit the steel mesh 4 and grip the steel mesh 4. When the hydraulic cylinder 314 extends, the limit block 312 retracts into the hollow rod 311 so that the hook 31 separates from the steel mesh 4. A rotation-prevention block 316 is fixedly connected to the top of the hollow rod 311. The rotation-prevention block 316 is a polygonal column structure with several rotation-prevention surfaces. The rotation-prevention block 316 is hinged to the guide block 318. A torsion spring 319 is also provided on the hinge shaft of the rotation-prevention block 316 to keep the hollow rod 311 vertical when it is not subjected to external force. The guide block 318 is slidably mounted on the lifting beam 32 in the vertical direction. A rotation-prevention groove 315 is provided below the rotation-prevention block 316 to prevent the rotation of the rotation-prevention block 316.

[0024] The lifting beam 32 is provided with a guide groove 317, and the guide block 318 is slidably assembled in the guide groove 317. The guide groove 317 is also provided with a spring 320 for driving the guide block 318 to reset. When the hook 31 separates from the steel mesh 4, the spring 320 drives the guide block 318 to rise, so that the anti-rotation block 316 separates from the anti-rotation groove 315.

[0025] After the reinforcing mesh 4 is positioned, the lifting device 3 grabs the reinforcing mesh 4. If there is an interval error in the reinforcing mesh 4 to be grabbed, the hollow rod 311 will deflect during descent (since the interval error between the reinforcing bars is relatively small, the hollow rod 311 will not deflect excessively and will not affect the normal grabbing of the hook 31). When the hollow rod 311 descends, the limiting block 312 is compressed and contracted by the reinforcing bars. After the limiting block 312 has completely passed through the reinforcing mesh 4, it extends. When the lifting device 3 lifts, the limiting block 312 limits the reinforcing mesh 4, thus achieving the grabbing of the reinforcing mesh 4. At the same time, when lifting the reinforcing mesh 4, the anti-rotation block 316 descends and falls into the anti-rotation groove 315 to prevent the hollow rod 311 from rotating during the transfer. After the reinforcing mesh 4 is transferred to the binding platform, the hydraulic cylinder 314 extends, causing the limiting block 312 to retract into the hollow rod 311, releasing the grabbing of the reinforcing mesh 4.

[0026] S3, Transfer: The grabbed steel mesh 4 is transferred to the binding platform using lifting equipment; S4. The lifting device 3 adjusts the placement angle of the steel mesh 4 according to the placement position of the steel mesh 4. After the angle is adjusted, the steel mesh 4 is placed in the preset position on the binding platform. The binding platform is provided with a positioning groove for positioning the steel mesh 4. The steel mesh 4 on the binding platform is positioned by the positioning groove. S5. Tie and secure the steel mesh 4 placed on the binding platform.

[0027] The reinforcing mesh includes the bottom slab top reinforcing mesh, the web inner reinforcing mesh, the bottom slab spur inclined reinforcing mesh, the cantilever bottom inner reinforcing mesh, the top slab spur inclined reinforcing mesh, the top slab bottom reinforcing mesh, the top slab top reinforcing mesh, the cantilever bottom outer reinforcing mesh, and the cantilever top reinforcing mesh. The specific installation sequence can be found in the patent publication with publication number CN116812728A.

[0028] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A process for paving ultra-large steel mesh in precast beams, characterized in that, Includes the following steps: S1. Rebar mesh positioning: The rebar mesh located on the finished product receiving rack is positioned by a positioning mechanism. S2. Grab the reinforcing mesh. The lifting equipment drives the lifting device to move above the reinforcing mesh, and then the lifting equipment controls the lifting device to descend and grab the reinforcing mesh. The lifting device has adjustable-spaced hooks on the lifting beam to grab the reinforcing mesh with spacing errors. S3. Transfer: The steel mesh grabbed is transferred to the binding platform using lifting equipment. S4. The lifting equipment adjusts the placement angle of the steel mesh according to its placement position. After the angle is adjusted, the steel mesh is placed in the preset position on the binding platform. S5. Tie and secure the steel mesh placed on the binding platform; In S2, the hook includes a vertically arranged hollow rod, a hydraulic cylinder is fixedly installed inside the hollow rod, a limit block is hinged to the bottom of the hydraulic cylinder, and a through hole is opened on the side wall of the hollow rod for the limit block to pass through; when gripping, the hydraulic cylinder retracts, and the limit block extends to the outside of the hollow rod to limit the steel mesh to grip the steel mesh; when the hydraulic cylinder extends, the limit block retracts into the hollow rod so that the hook separates from the steel mesh; The top of the hollow rod is fixedly connected to an anti-rotation block, which has several anti-rotation surfaces. The anti-rotation block is hinged to a guide block, which is slidably mounted on the lifting beam in the up-down direction. An anti-rotation groove is provided below the anti-rotation block to prevent it from rotating. The lifting beam is provided with a guide groove, and the guide block is slidably assembled in the guide groove. The guide groove is also provided with a spring for driving the guide block to reset. When the hook is separated from the steel mesh, the spring drives the guide block to rise, so that the anti-rotation block is separated from the anti-rotation groove.

2. The precast beam ultra-large steel mesh laying process according to claim 1, characterized in that: In S1, the positioning mechanism includes a positioning rod, which is hinged to the finished product receiving rack at its middle position. A connecting rod is hinged to the bottom of the positioning rod, and a positioning cylinder is hinged to the other end of the connecting rod. When the steel mesh is positioned, the positioning cylinder extends, causing the upper end of the positioning rod to push the steel mesh back to the set position to complete the positioning. Afterward, the positioning cylinder retracts, causing the top of the positioning rod to descend to the bottom of the steel mesh, thus avoiding collision between the steel mesh and the positioning rod.

3. The precast beam ultra-large steel mesh laying process according to claim 1, characterized in that: In S4, a positioning groove is provided on the binding platform for positioning the steel mesh. The steel mesh on the binding platform is positioned by the positioning groove.

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