A lifting beam device and design method for lifting steel grid

Abstract

The invention discloses a lifting beam device and a design method for lifting a steel grid frame, comprising a single crane hook and a lifting beam structure composed of a box model, wherein the lifting beam structure is connected to the single crane hook by a steel rope, a lifting hook is arranged at the lower part of the lifting beam structure and the steel grid frame structure is connected by the lifting hook, the invention can accurately know the deformation characteristics of the steel grid frame structure through numerical simulation, and reversely design the maximum spacing of the lifting beam hooks and the minimum number of the lifting beam hooks by comparing the model deformation value and the allowable deformation value, thereby ensuring the stability of the steel grid frame lifting while saving the cost, and can be applicable to the design of lifting beams for steel grid frames of different types and sizes, so as to realize the lifting of the steel grid frame structure by a single crane equipment, save crane resources, reduce construction costs, and the box-shaped section has good bending and torsional properties and high stability. In addition, the lifting beam device is easy to install and disassemble, and the construction is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of steel grid hoisting, and in particular to a hoisting beam device and a design method for hoisting a steel grid. Background Art

[0002] At present, with the continuous development of large-span steel structures, the size of steel grid structures is increasing. Due to the advantages of light weight, high rigidity and good seismic performance, steel structures are widely used in the roofs of public buildings such as gymnasiums, shopping malls, and waiting halls. In actual projects, a single crane is generally used for lifting and installation. Due to the small number of lifting fulcrums, the steel grid is prone to local buckling, causing damage to the steel grid. In order to prevent such situations from happening, multiple cranes are usually used for collaborative lifting operations, but there are problems such as poor coordination and low work efficiency during the lifting process (due to insufficient consistency, it is easy to cause bending stress, torque force, and even flipping of the steel grid in the air), and it also causes a waste of crane mechanical resources. Summary of the invention

[0003] The purpose of the present invention is to provide a lifting beam device and a design method for lifting a steel grid, so as to overcome the shortcomings of the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lifting beam device for lifting a steel grid frame, comprising a single crane hook and a lifting beam structure composed of a box model, wherein the lifting beam structure is connected to the single crane hook by a steel rope, and a lifting hook is arranged at the lower part of the lifting beam structure and is connected to the steel grid structure by the lifting hook.

[0005] As a further solution of the present invention: the suspension beam structure is composed of at least two box models spliced ​​together, and adjacent box models are connected by high-strength bolts, so that the adjacent box models are in surface contact and form a whole.

[0006] As a further solution of the present invention: a lifting ring is provided at the center of the top of each box model, and the steel rope is looped on the hanging beam structure through the lifting ring; a lifting hook is provided at the center of the bottom of each box model;

[0007] As a further solution of the present invention: the force points of the lifting ring and the lifting hook on the same box model are located on the same vertical line.

[0008] As a further solution of the present invention: the number of the steel ropes is at least two.

[0009] As a further solution of the present invention: the box model is hollow inside; through grooves are provided at corresponding positions of the upper panel and the lower panel of the box model, and limiting and reinforcing plates are fixedly provided inside the box model on both sides of the through grooves;

[0010] As a further solution of the present invention: a hook base is provided at the end of the hook, and a ring base is provided at the end of the ring; the hook passes through the through slot of the lower panel of the box model, and the hook base is located inside the box model and clamped with the limit and reinforcement plates at the corresponding positions; the ring passes through the through slot of the upper panel of the box model, and the ring base is located inside the box model and clamped with the limit and reinforcement plates at the corresponding positions, and a support plate is provided in the box model below the ring base for supporting the ring and the ring base; the ring base and the hook base are connected as a whole by a retractable rod, so that the hook and the ring can move along the through slot direction and ensure that the force points of the ring and the hook on the same box model are located on the same vertical line.

[0011] As a further solution of the present invention: the working surfaces of the lifting ring base and the lifting hook base are both corrugated surface structures, and the working surfaces of the limiting and reinforcing plates are both corrugated surface structures, so that the lifting ring base and the lifting hook base will not have relative displacement after being pressed against the corresponding limiting and reinforcing plates.

[0012] As a further solution of the present invention: a moving mechanism is symmetrically arranged on both sides of the hook base, and the moving mechanism includes rollers. The rollers are in contact with the inner surface of the lower panel of the box model and roll thereon. A guide shaft is arranged above the rollers, and the guide shaft is connected to the roller shaft of the roller through a bushing. The guide shaft is movably connected to the hook base.

[0013] As a further solution of the present invention: through holes are symmetrically arranged on the hook base, and the guide shaft can freely pass through the through holes at corresponding positions on the hook base, so that the guide shaft can move freely up and down along the through holes; a preload spring is sleeved on the guide shaft and the preload spring is stuck in the space between the lower surface of the hook base and the shaft sleeve; the rebound displacement of the preload spring is greater than the height difference between the limit and reinforcement plate and the shaft sleeve; so that when there is no vertical external force, the hook and the lifting ring can be driven by the moving mechanism to move along the through groove direction to achieve the position adjustment of the hook and the lifting ring.

[0014] A design method for a lifting beam device for lifting a steel grid, wherein the design method for the spacing and number of hooks comprises the following steps:

[0015] S1, construct a steel grid model consistent with the actual situation in the finite element numerical simulation software ABAQUS;

[0016] S2, giving the steel grid model material parameters consistent with the actual project;

[0017] S3, two hooks are set at any nodes on the upper part of the steel grid model;

[0018] S4, set the constraints of the hook in the x, y, and z directions;

[0019] S5, applying gravity load to the steel grid model;

[0020] S6, obtaining the mid-span deformation value of the steel grid model between the two hooks according to the displacement cloud map, and comparing it with the mid-span allowable deformation value;

[0021] S7, adjusting the distance between the two hooks on the upper part of the steel grid model, and then comparing the mid-span deformation value of the steel grid model obtained according to the displacement cloud map with the mid-span allowable deformation value, until the mid-span deformation value of the steel grid model between the two hooks is less than the mid-span allowable deformation value, and determining the maximum distance between the hooks;

[0022] S8, arranging the hooks at equal intervals according to the maximum interval determined in step S7, obtaining the deformation value of the cantilever of the steel grid model according to the displacement cloud map, and comparing it with the allowable cantilever sinking value;

[0023] S9, adjusting the position of the upper hook of the steel grid model, and then using the displacement cloud map to obtain the deformation value of the cantilever of the steel grid model and compare it with the allowable cantilever sinking value, until the deformation value of the cantilever of the steel grid model is less than the allowable cantilever sinking value, and determining the minimum number of hooks;

[0024] A design method for a lifting beam device for lifting a steel grid, wherein the design method of a box model comprises the following steps:

[0025] S1, a box model with a certain wall thickness is established in the finite element numerical simulation software ABAQUS, a bolt model is established using shell elements, and a lifting beam model is formed by assembling several box models and several bolt models;

[0026] S2, giving the box model and bolt model material parameters equivalent to those of steel;

[0027] S3, arranging hooks at the lower part of the box model according to the hook spacing;

[0028] S4, a concentrated load equivalent to the deadweight of the steel grid is applied at the hook;

[0029] S5, obtaining the maximum tensile stress and deformation of the box model according to the stress nephogram and the displacement nephogram, and comparing them with the maximum allowable tensile stress and the allowable deformation respectively;

[0030] S6, adjusting the material parameters of the box model in step S2, and then obtaining the maximum tensile stress and deformation of the box model according to the stress cloud map and the displacement cloud map, and comparing them with the maximum allowable tensile stress and the allowable deformation respectively, until the maximum tensile stress of the box model is less than the maximum allowable tensile stress and the deformation is less than the allowable deformation, and determining the material parameters and wall thickness of the box model.

[0031] A design method for a lifting beam device for lifting a steel grid, wherein the design method for a steel rope comprises the following steps:

[0032] S1, establish a steel rope model with the same length and diameter as that in the actual project in the finite element numerical simulation software ABAQUS;

[0033] S2, giving the steel rope model material parameters equivalent to those of steel;

[0034] S3, one end of the steel rope model is set to be bound and connected to the circular ring on the upper part of the box-type module model, and the other end is fixed with constraints in the x, y, and z directions;

[0035] S4, a concentrated load equivalent to the sum of the deadweight load of the steel grid and the deadweight load of the box-type module is applied to the box-type module;

[0036] S5, obtaining the elongation of the steel rope model according to the displacement cloud diagram, and comparing it with the allowable elongation;

[0037] S6, adjusting the material parameters of the steel rope model, and then obtaining the elongation of the steel rope model according to the displacement cloud map and comparing it with the allowable elongation, until the elongation of the steel rope model is less than the allowable elongation, and determining the material parameters of the steel rope.

[0038] The design principle of the present invention, the technical differences and effects compared with the prior art:

[0039] 1. The present invention first simulates the steel grid model respectively through finite element numerical simulation software, obtains the maximum distance between adjacent stress points on the steel grid model (the stress points are used for fixed connection with the hooks) based on the maximum allowable deformation value, maximum bending stress and maximum torque, and determines the center of gravity position and center of gravity line of the steel grid; then, the box model and the steel rope model are respectively simulated through finite element numerical simulation to obtain the material and wall thickness of the box model; and the material of the steel rope, so that the strength and deformation of the box model and the steel rope meet the relevant requirements.

[0040] 2. According to the maximum distance of the stress points on the steel grid model and the position of the center of gravity of the steel grid; with the center of gravity of the steel grid as the center, select the corresponding steel grid structure points on the steel grid around it as the stress points (the steel grid structure point should not slide easily with the hook, and the material strength here should be sufficient, and the distribution of the steel grid structure points should not be all on the same side of the steel grid); then adjust the position of the hook on the hanging beam formed by the box model so that the hook is connected to the corresponding steel grid stress point, and the distance is adjusted so that there is only vertical tension between each hook and the corresponding steel grid stress point (that is, the hook and the corresponding There is only vertical tension between the stress points of the steel grid, corresponding to the suspension beam and the steel grid. The hooks at different positions on the suspension beam vertically lift the steel grid. In addition to bearing the vertical tension to overcome its own weight, there will be no bending stress and torque between the two hooks, which greatly reduces the possibility of damage to the steel grid. At the same time, the stress points of the steel grid can be flexibly selected, so that the connection between the hook and the steel grid will be reliable without loosening or sliding. If the existing multi-crane method or multiple fixed-distance hooks are used to lift the steel grid, bending and torque of the steel grid will inevitably occur, increasing the safety risk).

[0041] 3. Since the lifting ring and the hook are located on the same vertical line in this application, and the lifting ring is connected to the crane hook through an inclined steel rope, wherein the crane hook is located on the center of gravity of the steel grid, the hook gives it a downward pulling force, and the steel rope gives it an oblique pulling force; for the box model, the oblique pulling force of the steel rope can be decomposed into the vertical pulling force in the Z-axis direction, the horizontal pulling force in the X-axis direction (causing the box model to bend or squeeze), and the horizontal pulling force in the Z-axis direction (causing the box model to torque); since the lifting ring and the hook are located on the same vertical line, the pulling force in the Z-axis direction and the downward pulling force of the hook are offset (the box model The model itself only bears vertical tension), the horizontal force in the X-axis direction can be offset by the high-strength bolts or the compressive strength of the box model itself, and the horizontal force in the Y-axis direction generates torque for a single box model, which can be offset by the single box model itself and the high-strength bolts; since the center of gravity of the crane hook coincides with the steel grid and the force on the hook is in the vertical direction, the torque generated by the horizontal force in the Y-axis direction is balanced for the hanging beam composed of the box model (therefore, when selecting the force points of the steel grid in the early stage, it is necessary to ensure that the steel grid will not flip when each force point is subjected to force).

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The present invention can accurately know the deformation characteristics of the steel grid structure through numerical simulation. By comparing the model deformation value with the allowable deformation value, the maximum spacing of the lifting beam hooks and the minimum number of hooks are reversely designed to ensure the stability of the steel grid lifting while saving costs.

[0044] 2. The design method of the present invention can be applied to the design of lifting beams of steel grid structures of different types and sizes.

[0045] 3. The lifting beam device of the present invention can be installed at the hook of a single crane, so that a single crane equipment can lift the steel grid structure, saving crane resources and reducing construction costs.

[0046] 4. The lifting beam device of the present invention is assembled from box-type modules. The box-type section has good bending and torsional resistance and high stability. In addition, the lifting beam device is easy to install and disassemble, and the construction is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Figure 1 It is a diagram of a lifting beam device of the present invention;

[0049] Figure 2 A flow chart of the lifting beam design method of the present invention;

[0050] Figure 3 for Figure 1 Side view of

[0051] Figure 4 A top view of a single box model in the present invention;

[0052] Figure 5 for Figure 4 AA section view;

[0053] Figure 6 for Figure 5 BB cross-sectional view;

[0054] Figure 7 It is a structural schematic diagram of the moving mechanism in the present invention;

[0055] Figure 8 It is a schematic diagram of the forces acting on each structure in the present invention.

[0056] In the figure: 1 box-type module, 1.1 through slot, 1.2 limit and reinforcement plate, 1.3 support plate, 1.4 telescopic rod, 2 steel rope, 3 hook, 3.1 hook base, 3.11 roller, 3.12 guide shaft, 3.13 bushing, 3.14 preload spring, 3.15 roller shaft, 4 ring, 4.1 lifting ring base, 5 high-strength bolts, 6 steel grid structure, 7 crane hook, 8 steel grid center of gravity line. DETAILED DESCRIPTION

[0057] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0058] refer to Figure 1-7 The present invention provides a lifting beam device for lifting a steel grid frame, comprising a single crane hook 7, and also comprising a hanging beam structure composed of a box model 1, wherein the hanging beam structure is composed of at least two box models 1 spliced ​​together, and adjacent box models 1 are connected by high-strength bolts 5, so that adjacent box models 1 are in surface contact and form a whole, and a lifting ring 4 is arranged at the center of the top of each box model 1, and a steel rope 2 is sleeved on the hanging beam structure through the lifting ring 4; a hook 3 is arranged at the center of the bottom of each box model 1, and the force points of the lifting ring 4 and the hook 3 on the same box model 1 are located on the same vertical line; the hanging beam structure is connected to the single crane hook 7 by a steel rope 2, and the number of the steel ropes 2 is at least two, and a hook 3 is arranged at the lower part of the hanging beam structure and connected to the steel grid structure 6 through the hook 3.

[0059] The box model 1 is hollow inside; through grooves 1.1 are provided at corresponding positions of the upper panel and the lower panel of the box model 1, and limit and reinforcement plates 1.2 are fixedly provided on the inner side of the box model 1 on both sides of the through grooves 1.1; a hook base 3.1 is provided at the end of the hook 3, and a ring base 4.1 is provided at the end of the ring 4; the hook 3 passes through the through groove 1.1 of the lower panel of the box model 1, and the hook base 3.1 is located inside the box model 1 and is clamped with the limit and reinforcement plates 1.2 at the corresponding positions; the ring 4 passes through the through groove 1.1 of the upper panel of the box model 1, and the ring base 4.1 is located at the end of the ring 4; The support plate 1.3 is provided in the box model 1 below the ring base 4.1 to support the ring 4 and the ring base 4.1; the ring base 4.1 and the hook base 3.1 are connected as a whole through a retractable rod 1.4, so that the hook 3 and the ring 4 can move along the through groove 1.1 and ensure that the force points of the ring 4 and the hook 3 on the same box model 1 are located on the same vertical line; the working surfaces of the ring base 4.1 and the hook base 3.1 are both corrugated surface structures, and the working surfaces of the limit and reinforcement plates 1.2 are The corrugated surface structure ensures that the ring base 4.1 and the hook base 3.1 will not be relatively displaced after being pressed against the corresponding limit and reinforcement plates 1.2; a moving mechanism is symmetrically arranged on both sides of the hook base 3.1, and the moving mechanism includes a roller 3.11, which contacts and rolls on the inner surface of the lower panel of the box model 1, and a guide shaft 3.12 is arranged above the roller 3.11, and the guide shaft 3.12 is connected to the roller shaft 3.15 of the roller 3.11 through a shaft sleeve 3.13, and the guide shaft 3.12 is movably connected to the hook base 3.1; a movable mechanism is symmetrically arranged on the hook base 3.1 There is a through hole, and the guide shaft 3.12 can freely pass through the through hole at the corresponding position on the hook base 3.1, so that the guide shaft 3.12 can move freely up and down along the through hole; a preload spring 3.14 is sleeved on the guide shaft 3.12 and the preload spring 3.14 is stuck in the space between the lower surface of the hook base 3.1 and the shaft sleeve 3.13; the rebound displacement of the preload spring 3.14 is greater than the height difference between the limit and reinforcement plate 1.2 and the shaft sleeve 3.13; so that when there is no vertical external force, the hook 3 and the lifting ring 4 can be driven by the moving mechanism to move along the through groove 1.1 to achieve the position adjustment of the hook 3 and the lifting ring 4.

[0060] The design method of the lifting beam device of this embodiment, wherein the design method of the spacing and number of hooks comprises the following steps:

[0061] S1, construct a steel grid model consistent with the actual situation in the finite element numerical simulation software ABAQUS;

[0062] S2, giving the steel grid model material parameters consistent with the actual project;

[0063] S3, two hooks are set at any nodes on the upper part of the steel grid model;

[0064] S4, set the constraints of the hook in the x, y, and z directions;

[0065] S5, applying gravity load to the steel grid model;

[0066] S6, obtaining the mid-span deformation value of the steel grid model between the two hooks according to the displacement cloud map, and comparing it with the mid-span allowable deformation value;

[0067] S7, adjusting the distance between the two hooks on the upper part of the steel grid model, and then comparing the mid-span deformation value of the steel grid model obtained according to the displacement cloud map with the mid-span allowable deformation value, until the mid-span deformation value of the steel grid model between the two hooks is less than the mid-span allowable deformation value, and determining the maximum distance between the hooks;

[0068] S8, arranging the hooks at equal intervals according to the maximum interval determined in step S7, obtaining the deformation value of the cantilever of the steel grid model according to the displacement cloud map, and comparing it with the allowable cantilever sinking value;

[0069] S9, adjusting the position of the upper hook of the steel grid model, and then using the displacement cloud map to obtain the deformation value of the cantilever of the steel grid model and compare it with the allowable cantilever sinking value, until the deformation value of the cantilever of the steel grid model is less than the allowable cantilever sinking value, and determining the minimum number of hooks;

[0070] The design method of the lifting beam device of this embodiment, wherein the design method of the box model comprises the following steps:

[0071] S1, a box model with a certain wall thickness is established in the finite element numerical simulation software ABAQUS, a bolt model is established using shell elements, and a lifting beam model is formed by assembling several box models and several bolt models;

[0072] S2, giving the box model and bolt model material parameters equivalent to those of steel;

[0073] S3, arranging hooks at the lower part of the box model according to the hook spacing;

[0074] S4, a concentrated load equivalent to the deadweight of the steel grid is applied at the hook;

[0075] S5, obtaining the maximum tensile stress and deformation of the box model according to the stress nephogram and the displacement nephogram, and comparing them with the maximum allowable tensile stress and the allowable deformation respectively;

[0076] S6, adjusting the material parameters of the box model in step S2, and then obtaining the maximum tensile stress and deformation of the box model according to the stress cloud map and the displacement cloud map, and comparing them with the maximum allowable tensile stress and the allowable deformation respectively, until the maximum tensile stress of the box model is less than the maximum allowable tensile stress and the deformation is less than the allowable deformation, and determining the material parameters and wall thickness of the box model.

[0077] The design method of the lifting beam device of this embodiment, wherein the design method of the steel rope comprises the following steps:

[0078] S1, establish a steel rope model with the same length and diameter as in the actual project in the finite element numerical simulation software ABAQUS;

[0079] S2, giving the steel rope model material parameters equivalent to those of steel;

[0080] S3, one end of the steel rope model is set to be bound and connected to the circular ring on the upper part of the box-type module model, and the other end is fixed with constraints in the x, y, and z directions;

[0081] S4, a concentrated load equivalent to the sum of the deadweight load of the steel grid and the deadweight load of the box-type module is applied to the box-type module;

[0082] S5, obtaining the elongation of the steel rope model according to the displacement cloud diagram, and comparing it with the allowable elongation;

[0083] S6, adjusting the material parameters of the steel rope model, and then obtaining the elongation of the steel rope model according to the displacement cloud map and comparing it with the allowable elongation, until the elongation of the steel rope model is less than the allowable elongation, and determining the material parameters of the steel rope.

[0084] The lifting method of the lifting beam device of this embodiment comprises the following steps:

[0085] Step 1, select the stress points and the center of gravity of the steel grid; construct a steel grid model consistent with the actual situation through finite element numerical simulation software, obtain the maximum distance between adjacent stress points on the steel grid model based on the maximum allowable deformation value, maximum bending stress and maximum torque of the steel grid, and determine the center of gravity of the steel grid 8, where the stress points should be distributed around the center of gravity of the steel grid so that the stress points can maintain a stable shape of the steel grid after being subjected to vertical force (preferably without flipping or deflection);

[0086] Step 2, assembling the hanging beam; assembling the hanging beam according to the size of the steel grid and the number of stress points, the hanging beam is composed of at least two box models 1 spliced ​​together, and the adjacent box models 1 are connected by high-strength bolts 5, so that the adjacent box models 1 are in surface contact and form a whole; a lifting ring 4 is set at the center of the top of each box model 1, and the steel rope 2 is set on the hanging beam structure through the lifting ring 4; a hook 3 is set at the center of the bottom of each box model 1; the stress points of the lifting ring 4 and the hook 3 on the same box model 1 are located on the same vertical line;

[0087] Step three, connect the hanging beam to the steel grid; move the position of the hook 3 on the box model 1 so that the hook 3 is connected to the corresponding force point of the steel grid, ensuring that the hook 3 and the corresponding force point are on the same vertical plane, so that there is only vertical force between the hanging beam and the steel grid.

[0088] Step 4, install the crane hook and connect it to the hanging beam; according to the position of the center of gravity of the steel grid in step 1, place the crane hook 7 on the center of gravity 8 of the steel grid, and then connect the lifting ring 4 corresponding to each stress point to the crane hook 7 through the steel rope 2, and the prestress between the steel ropes 2 remains consistent.

[0089] Finally, it should be noted that when describing the position of each component and the matching relationship between them, the present invention usually takes one / a pair of components as an example. However, those skilled in the art should understand that such position, matching relationship, etc. are also applicable to other components / other pairs of components.

[0090] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A lifting beam device for lifting a steel grid, comprising a single crane hook, characterized in that: It also includes a hanging beam structure consisting of a box model; The hanging beam structure is connected to the hook of a single crane through a steel rope, a hook is arranged at the lower part of the hanging beam structure and connected to the steel grid structure through the hook; The hanging beam structure is composed of at least two box models spliced ​​together, the box model is hollow inside, and a hanging ring is set at the center of the top of each box model; Through slots are provided at corresponding positions of the upper panel and the lower panel of the box model, and limiting and reinforcing plates are fixedly provided on the inner side of the box model on both sides of the through slots; A hook base is provided at the end of the hook, the hook passes through the through slot of the lower panel of the box model, and the hook base is located inside the box model and is clamped with the limit and reinforcement plates at corresponding positions; A lifting ring base is provided at the end of the lifting ring, the lifting ring passes through the through slot of the upper panel of the box model, and the lifting ring base is located inside the box model and is clamped with the limit and reinforcement plates at corresponding positions; The lifting ring base and the lifting hook base are connected as one body via a telescopic rod; The working surfaces of the lifting ring base and the lifting hook base are both corrugated surface structures, and the working surfaces of the limiting and reinforcing plates are both corrugated surface structures, so that the lifting ring base and the lifting hook base will not be relatively displaced after being pressed against the corresponding limiting and reinforcing plates; A moving mechanism is symmetrically arranged on both sides of the hook base, and the moving mechanism includes rollers, the rollers are in contact with the inner surface of the lower panel of the box model and roll thereon, a guide shaft is arranged above the rollers, the guide shaft is connected to the roller shaft of the roller through a shaft sleeve, and the guide shaft is movably connected to the hook base; Through holes are symmetrically arranged on the hook base, and the guide shaft can freely pass through the through holes at corresponding positions on the hook base, so that the guide shaft can freely move up and down along the through holes. A preload spring is sleeved on the guide shaft and is stuck in the space between the lower surface of the hook base and the shaft sleeve; the rebound displacement of the preload spring is greater than the height difference between the limit and reinforcement plate and the shaft sleeve.

2. A lifting beam device for lifting a steel grid according to claim 1, characterized in that: The adjacent box models are connected by high-strength bolts, so that the adjacent box models are in surface contact and form an integral suspension beam structure.

3. A lifting beam device for lifting a steel grid according to claim 1, characterized in that: The steel rope is set on the hanging beam structure through the lifting ring; a hook is set at the center of the bottom of each box model; The force bearing points of the lifting ring and the lifting hook on the same box model are located on the same vertical line.

4. A lifting beam device for lifting a steel grid according to claim 1, characterized in that: The number of the steel ropes is at least two.

5. The lifting beam device for lifting a steel grid according to claim 1, characterized in that: A support plate is arranged in the box model below the lifting ring base for supporting the lifting ring and the lifting ring base.

6. A design method for a lifting beam device for lifting a steel grid according to any one of claims 1 to 5, characterized in that The design method of the spacing and number of hooks comprises the following steps: S1, construct a steel grid model consistent with the actual situation in the finite element numerical simulation software ABAQUS; S2, giving the steel grid model material parameters consistent with the actual project; S3, two hooks are set at any nodes on the upper part of the steel grid model; S4, set the constraints of the hook in the x, y, and z directions; S5, applying gravity load to the steel grid model; S6, obtaining the mid-span deformation value of the steel grid model between the two hooks according to the displacement cloud map, and comparing it with the mid-span allowable deformation value; S7, adjusting the distance between the two hooks on the upper part of the steel grid model, and then comparing the mid-span deformation value of the steel grid model obtained according to the displacement cloud map with the mid-span allowable deformation value, until the mid-span deformation value of the steel grid model between the two hooks is less than the mid-span allowable deformation value, and determining the maximum distance between the hooks; S8, arranging the hooks at equal intervals according to the maximum interval determined in step S7, obtaining the deformation value of the cantilever of the steel grid model according to the displacement cloud map, and comparing it with the allowable cantilever sinking value; S9, adjusting the position of the upper hook of the steel grid model, and then using the displacement cloud map to obtain the deformation value of the cantilever of the steel grid model and compare it with the allowable cantilever sinking value, until the deformation value of the cantilever of the steel grid model is less than the allowable cantilever sinking value, and determining the minimum number of hooks.

7. A design method for a lifting beam device for lifting a steel grid according to any one of claims 1 to 5, characterized in that The design method of the box model comprises the following steps: S1, a box model with a certain wall thickness is established in the finite element numerical simulation software ABAQUS, a bolt model is established using shell elements, and a lifting beam model is formed by assembling several box models and several bolt models; S2, giving the box model and bolt model material parameters equivalent to those of steel; S3, arranging hooks at the lower part of the box model according to the hook spacing; S4, a concentrated load equivalent to the deadweight of the steel grid is applied at the hook; S5, obtaining the maximum tensile stress and deformation of the box model according to the stress nephogram and the displacement nephogram, and comparing them with the maximum allowable tensile stress and the allowable deformation respectively; S6, adjusting the material parameters of the box model in step S2, and then obtaining the maximum tensile stress and deformation of the box model according to the stress cloud map and the displacement cloud map, and comparing them with the maximum allowable tensile stress and the allowable deformation respectively, until the maximum tensile stress of the box model is less than the maximum allowable tensile stress and the deformation is less than the allowable deformation, and determining the material parameters and wall thickness of the box model.

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