An optimized construction method and system for fastening cable clamp bolt groups.

Abstract

This invention relates to an optimized construction method and system for cable clamp bolt group fastening, relating to the fields of bridge and building structural engineering. The method includes: obtaining the rigidity characteristics of the cable cross-section under the clamping force; constructing a numerical model of the cable clamp and cable based on the cable cross-section rigidity characteristics under the clamping force; tightening and optimizing the bolts based on the numerical model to obtain the required number of tightening passes and the required tightening force; and tightening the cable clamps and bolts installed on the cable according to the required number of tightening passes and the required tightening force. This invention improves tightening efficiency and quality while solving problems caused by crosstalk effects.

Description

Technical Field

[0001] This invention relates to the field of bridge and building structural engineering, and in particular to an optimized method and system for fastening cable clamp bolt groups. Background Technology

[0002] Prestressed high-strength bolt connections are a widely used method for connecting components or assemblies in civil engineering and machinery. Bolts are typically tightened using either tightening or tensioning methods to obtain preload. The arrangement of bolts in connection nodes is diverse and generally involves a large number, hence the term "bolt group." In engineering practice, it is often impossible to tighten all bolts on a node simultaneously; they must be tightened in batches in a specific order. This results in the later-tightened bolts increasing the deformation of the connection node, leading to a decrease in the preload of the earlier-tightened bolts. This effect is called the "Bolts crosstalk effect" in bolt group tightening. The crosstalk effect leads to two consequences: first, it is difficult to achieve a uniform preload that meets design requirements for all bolts in a single tightening operation, requiring multiple tightening passes, resulting in high labor costs; second, it is difficult to determine the remaining tensile force of each bolt at the end of the tightening process, leading to concerns about construction quality. Bolted connection nodes rely on the preload of the bolts to achieve the designed connection function. Inadequate bolt group tightening will cause discrepancies between the actual stress state of the connection node and the design, creating potential structural safety hazards. To address this issue and ensure the quality of cable clamp fastening and construction efficiency, specific and effective methods are needed to guide the engineering construction. Summary of the Invention

[0003] The purpose of this invention is to provide an optimized construction method and system for cable clamp bolt group fastening, which improves fastening efficiency and quality while solving the problems caused by crosstalk effect.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] An optimized construction method for fastening cable clamp bolt groups includes:

[0006] Obtain the rigidity characteristics of the cable cross-section under the action of clamping force;

[0007] Numerical models of the cable clamp and cable are constructed based on the rigidity characteristics of the cable cross-section under the clamping force.

[0008] Based on the numerical model of the cable clamp and cable, the bolts are tightened and optimized to obtain the required number of tightening passes and the required tightening force of the bolts.

[0009] The cable clamps and bolts installed on the cable are tightened according to the required number of tightening passes and the required tightening force of the bolts.

[0010] Optionally, obtaining the rigidity characteristics of the cable cross-section under the clamping force specifically includes:

[0011] The relationship between clamping force and cable cross-sectional deformation was tested using clamps and bolts installed on the cable to obtain the rigidity characteristics of the cable cross-section under clamping force.

[0012] Optionally, the step of constructing a numerical model of the cable clamp and cable based on the rigidity characteristics of the cable cross-section under the clamping force specifically includes:

[0013] Construct constitutive models for elastic materials;

[0014] The stress-strain data of the constitutive model of the elastic material are adjusted according to the rigidity characteristics of the cable cross-section under the clamping force to obtain the numerical model of the clamp and the cable.

[0015] Optionally, the step of tightening and optimizing the bolts based on the numerical model of the cable clamp and cable to obtain the required number of tightening passes and the required tightening force of the bolts specifically includes:

[0016] The clamp and cable numerical model are tightened according to the set tightening force to obtain the number of tightening passes and the remaining tensile force of each bolt;

[0017] Determine whether at least one of the remaining tensile forces of each bolt is less than the target tightening force to obtain the first determination result;

[0018] If the first judgment result indicates yes, then the number of tightening passes is incremented by one, and the process returns to the step "tighten the clamp and cable numerical model according to the set tightening force to obtain the number of tightening passes and the remaining tensile force of each bolt";

[0019] If the first judgment result is negative, then it is determined whether the remaining tensile force of each bolt is greater than the set tensile force, and a second judgment result is obtained;

[0020] If the second judgment result indicates yes, then the set fastening force of the bolt is updated using the updated fastening force, and the process returns to the step "tighten the clamp and cable numerical model according to the set fastening force to obtain the number of tightening passes and the remaining tensile force of each bolt";

[0021] If the second judgment result is negative, then the required tightening force of the bolt is determined according to the set tightening force and the number of tightening passes, and the number of tightening passes is determined as the required number of tightening passes of the bolt.

[0022] Optionally, the formula for calculating the updated fastening force is:

[0023] F cur =αF t -iΔF

[0024] Among them, F cur To update the fastening force, α is the overtension law, F is the target fastening force, i is the multiplier, and ΔF is the minimum adjustment amount of the fastening force.

[0025] An optimized construction system for fastening cable clamp bolt groups includes:

[0026] The acquisition module is used to acquire the rigidity characteristics of the cable cross section under the action of the cable clamping force;

[0027] The construction module is used to construct numerical models of the cable clamp and cable based on the rigidity characteristics of the cable cross-section under the clamping force.

[0028] The fastening and optimization module is used to fasten and optimize the bolts according to the numerical model of the cable clamp and cable to obtain the required number of fastening passes and the required fastening force of the bolts.

[0029] The fastening module is used to fasten the cable clamp and bolt installed on the cable according to the required number of tightening passes and the required tightening force of the bolt.

[0030] Optionally, the acquisition module specifically includes:

[0031] The acquisition unit is used to conduct a test on the relationship between the clamping force and the cross-sectional deformation of the cable based on the clamps and bolts installed on the cable, and to obtain the rigidity characteristics of the cable cross-section under the action of the clamping force.

[0032] Optionally, the building module specifically includes:

[0033] Building blocks are used to construct constitutive models of elastic materials;

[0034] The adjustment unit is used to adjust the stress-strain data of the constitutive model of the elastic material according to the rigidity characteristics of the cable cross-section under the clamping force of the cable clamp, so as to obtain the numerical model of the cable clamp and the cable.

[0035] Optionally, the fastening and optimization module specifically includes:

[0036] The fastening unit is used to fasten the clamp and cable numerical model according to the set fastening force, so as to obtain the number of fastening passes and the remaining tensile force of each bolt;

[0037] The first judgment unit is used to determine whether the remaining tensile force of each bolt is less than at least the target tightening force, and to obtain the first judgment result;

[0038] The return unit is used to increment the number of tightening passes by one if the first judgment result indicates yes, and return to the step "tighten the clamp and cable numerical model according to the set tightening force to obtain the number of tightening passes and the remaining tensile force of each bolt";

[0039] The second judgment unit is used to determine whether the remaining tension of each bolt is greater than the set tension if the first judgment result indicates no, and to obtain the second judgment result.

[0040] The update unit is used to update the set tightening force of the bolt by using the updated tightening force if the second judgment result indicates yes, and return to the step "tighten the clamp and cable numerical model according to the set tightening force to obtain the number of tightening passes and the remaining tensile force of each bolt";

[0041] The determining unit is configured to determine the required tightening force of the bolt based on the set tightening force and the number of tightening passes if the second judgment result is negative, and to determine the number of tightening passes as the required number of tightening passes for the bolt.

[0042] Optionally, the formula for calculating the updated fastening force is:

[0043] F cur =αF t -iΔF

[0044] Among them, F cur To update the fastening force, α is the overtension law, F is the target fastening force, i is the multiplier, and ΔF is the minimum adjustment amount of the fastening force.

[0045] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0046] This invention provides a method and system for optimizing the construction of cable clamp bolt group fastening. The method involves obtaining the rigidity characteristics of the cable cross-section under the clamping force; constructing numerical models of the cable clamp and cable based on these characteristics; optimizing the bolt fastening process using these models to determine the required number of tightening passes and the required tightening force; and then tightening the clamps and bolts installed on the cable according to these parameters. Before actual construction, process simulation optimization determines the minimum number of tightening passes required for the bolt group and the specific tightening force required for each bolt. This ensures that the remaining tightening force of each bolt meets design requirements after the fastening process is completed, and that the adopted bolt group fastening procedure is optimally efficient, avoiding unnecessary tightening passes. Furthermore, by considering crosstalk effects during the fastening and optimization process based on the cable clamp and cable numerical models, the method improves fastening efficiency and quality while addressing the problems caused by crosstalk. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0048] Figure 1 Flowchart of the optimized construction method for fastening cable clamp bolt groups provided by the present invention;

[0049] Figure 2 A partial three-dimensional schematic diagram of the cable clamp during the engineering verification test;

[0050] Figure 3 This is a top view of the test cable clamp;

[0051] Figure 4 This is a graph showing the relationship between the clamping force of the cable clamp and the width of the gap between the two halves of the cable clamp.

[0052] Figure 5 A numerical model diagram for analyzing the fastening effect of cable clamps and cables;

[0053] Figure 6 The equivalent stress-strain curves for a multilinear elastic material model of a cable are shown.

[0054] Figure 7 A schematic diagram of the optimized construction method for fastening cable clamp bolt groups provided by the present invention;

[0055] Figure 8 A comparison diagram of the simulation results and experimental results for optimizing the bolt tightening process of the test cable clamp. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] The purpose of this invention is to provide an optimized construction method and system for cable clamp bolt group fastening, which improves fastening efficiency and quality while solving the problems caused by crosstalk effect.

[0058] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] like Figure 1As shown, the present invention provides an optimized construction method for fastening cable clamp bolt groups, comprising:

[0060] Step 101: Obtain the rigidity characteristics of the cable cross-section under the clamping force. Step 101 specifically includes:

[0061] The relationship between clamping force and cable cross-sectional deformation was tested using clamps and bolts installed on the cable to obtain the rigidity characteristics of the cable cross-section under clamping force.

[0062] Test the relationship between clamping force and cable cross-sectional deformation on the cable: Install clamps and bolts on the cable, tighten the clamps and bolts with multiple levels of tightening force, and record the gap width between the two halves of the clamp under each level of tightening force. The relationship between the tightening force and the gap width of the clamp is used to characterize the compressive deformation behavior (i.e., stiffness characteristics) of the cable cross-section under the clamping force.

[0063] Step 102: Construct numerical models of the cable clamp and cable based on the rigidity characteristics of the cable cross-section under the clamping force. Step 102 specifically includes:

[0064] Construct a constitutive model for elastic materials.

[0065] The stress-strain data of the constitutive model of the elastic material are adjusted according to the rigidity characteristics of the cable cross-section under the clamping force to obtain the numerical model of the clamp and the cable.

[0066] A numerical model for analyzing the clamping and cable fastening effects was established. A constitutive model of multilinear elastic materials was used to characterize the nonlinear cross-sectional mechanical properties of the cable. The equivalent stress-strain data of the numerical material were adjusted to fit the cross-sectional deformation behavior of the cable. Finally, the relationship between the clamping force and the cross-sectional deformation of the cable in the numerical model was made consistent with the force and deformation relationship reflected in the experimental data.

[0067] Step 103: Tighten and optimize the bolts according to the numerical model of the cable clamp and cable to obtain the required number of tightening passes and the required tightening force of the bolts. Step 103 specifically includes:

[0068] The clamp and cable numerical model are tightened according to a set tightening force to obtain the number of tightening passes and the remaining tensile force of each bolt. In practical applications, tightening the clamp and cable numerical model according to a set tightening force to obtain the number of tightening passes and the remaining tensile force of each bolt specifically includes first setting a set tightening force for each bolt, and then tightening each bolt sequentially according to the set tightening force to obtain the remaining tensile force.

[0069] The system determines whether at least one of the remaining tensile forces of each bolt is less than the target tightening force, obtaining a first determination result. If the first determination result indicates yes, the tightening pass count is incremented by one, and the system returns to the step "tighten the clamp and cable numerical model according to the set tightening force to obtain the tightening pass count and the remaining tensile force of each bolt." Specifically, the returned step involves setting the set tightening force for each bolt. If the first determination result indicates no, the system determines whether the remaining tensile force of each bolt is greater than the set tensile force, obtaining a second determination result. If the second determination result indicates yes, the set tightening force of the bolt is updated using the updated tightening force, and the system returns to the step "tighten the clamp and cable numerical model according to the set tightening force to obtain the tightening pass count and the remaining tensile force of each bolt." Specifically, the returned step involves tightening each bolt sequentially according to the set tightening force to obtain the remaining tensile force. If the second determination result indicates no, the required tightening force for the bolt is determined based on the set tightening force and the tightening pass count, and the tightening pass count is determined as the required tightening pass count for the bolt.

[0070] The formula for calculating the updated fastening force is as follows:

[0071] F cur =αF t -iΔF

[0072] Among them, F cur To update the fastening force, α is the overtension law, F t Let i be the target fastening force, i be the multiple, and ΔF be the minimum adjustment amount of the fastening force.

[0073] By using a simulation optimization algorithm for the fastening process of cable clamp bolt groups, the full process information of the optimal fastening procedure for cable clamp bolt groups is determined, including the number of cyclic fastening passes required for the bolts and the specific fastening force value required for each bolt during each fastening pass.

[0074] Step 104: Tighten the cable clamps and bolts installed on the cable according to the required number of tightening passes and the required tightening force. Perform the cable clamp bolt group tightening construction according to the above bolt tightening procedure.

[0075] This invention also provides a cable clamp bolt group fastening construction optimization system corresponding to the cable clamp bolt group fastening construction optimization method, comprising:

[0076] The acquisition module is used to acquire the rigidity characteristics of the cable cross-section under the action of the cable clamping force.

[0077] A construction module is used to construct numerical models of the cable clamp and cable based on the rigidity characteristics of the cable cross-section under the clamping force.

[0078] The fastening and optimization module is used to fasten and optimize the bolts according to the numerical model of the cable clamp and cable to obtain the required number of fastening passes and the required fastening force of the bolts.

[0079] The fastening module is used to fasten the cable clamp and bolt installed on the cable according to the required number of tightening passes and the required tightening force of the bolt.

[0080] As an optional implementation, the acquisition module specifically includes:

[0081] The acquisition unit is used to conduct a test on the relationship between the clamping force and the cross-sectional deformation of the cable based on the clamps and bolts installed on the cable, and to obtain the rigidity characteristics of the cable cross-section under the action of the clamping force.

[0082] As an optional implementation, the building module specifically includes:

[0083] Building blocks are used to construct constitutive models of elastic materials.

[0084] The adjustment unit is used to adjust the stress-strain data of the constitutive model of the elastic material according to the rigidity characteristics of the cable cross-section under the clamping force of the cable clamp, so as to obtain the numerical model of the cable clamp and the cable.

[0085] As an optional implementation, the fastening and optimization module specifically includes:

[0086] The fastening unit is used to fasten the clamp and cable numerical model according to the set fastening force, so as to obtain the number of fastening passes and the remaining tensile force of each bolt.

[0087] The first judgment unit is used to determine whether the remaining tensile force of each bolt is less than at least the target tightening force, and to obtain the first judgment result.

[0088] The return unit is used to increment the number of tightening passes by one if the first judgment result indicates yes, and return to the step "tighten the clamp and cable numerical model according to the set tightening force to obtain the number of tightening passes and the remaining tension of each bolt".

[0089] The second judgment unit is used to determine whether the remaining tension of each bolt is greater than the set tension if the first judgment result indicates no, and to obtain the second judgment result.

[0090] The update unit is used to update the set tightening force of the bolt by using the updated tightening force if the second judgment result indicates yes, and return to the step "tighten the clamp and cable numerical model according to the set tightening force to obtain the number of tightening passes and the remaining tension of each bolt".

[0091] The determining unit is configured to determine the required tightening force of the bolt based on the set tightening force and the number of tightening passes if the second judgment result is negative, and to determine the number of tightening passes as the required number of tightening passes for the bolt.

[0092] As an optional implementation, the formula for calculating the updated fastening force is:

[0093] F cur =αF t -iΔF

[0094] Among them, F cur To update the fastening force, α is the overtension law, F t Let i be the target fastening force, i be the multiple, and ΔF be the minimum adjustment amount of the fastening force.

[0095] This invention provides an optimized construction method for tightening cable clamp bolt groups. Before actual construction, process simulation optimization determines the minimum number of tightening passes required for the bolt group and the specific tightening force value required for each bolt. This ensures that the remaining tightening force of each bolt meets design requirements after tightening, and also ensures that the bolt group tightening procedure is optimally efficient, avoiding unnecessary tightening passes. Due to technical and equipment barriers and operational difficulties, on-site measurement of bolt tightening force is not yet widespread. Therefore, in engineering practice, it is difficult to determine whether the actual remaining bolt tightening force after tightening the cable clamp bolts reaches the design tensile force and meets the uniformity requirements. Construction units inevitably increase labor costs by continuously increasing the number of bolt tightening passes in hopes of ensuring the quality of cable clamp bolt tightening. If the adverse effects of "crosstalk" are not fully considered, and the number of tightening passes for the bolt group is too few, the remaining bolt tensile force will inevitably be less than the design tensile force, causing structural hazards. The method provided by this invention can solve this dilemma faced in engineering.

[0096] This invention also provides a specific working method for the optimized construction method of cable clamp bolt group fastening in practical applications, the details of which are as follows:

[0097] The test required the use of four bolt tensioners to tension the bolt group securing the cable clamp. All four tensioners were loaded by the same hydraulic pump to ensure consistent tension control during each tensioning cycle. The bolt tightening force was measured by a through-type pressure sensor, and the target tightening force was set at 320 kN. A partial three-dimensional schematic diagram of the test cable clamp is shown below. Figure 2 As shown. Figure 3As shown, the test cable clamp has 14 bolts in 2 rows and 7 columns, numbered L1-L7 and R1-R7. The bolts are tightened symmetrically from both sides of the clamp towards the middle: (L1, R1, L7, R7) → (L2, R2, L6, R6) → (L3, R3, L5, R5) → (L4, R4). The requirement is to optimize the entire process information of the cable clamp bolt group tightening procedure using the technical solution of this invention, including the minimum number of tightening cycles required for each bolt and the specific tightening force value required for each bolt in each tightening cycle. This invention can be applied to optimize the tightening construction method of prestressed high-strength bolt groups in cable clamps used in suspension bridges and prestressed cable-stayed structures.

[0098] The implementation steps of the technical solution disclosed in this invention are as follows:

[0099] (1) Conduct tests on the relationship between clamp tightening force and cable cross-sectional deformation. Specifically, clamp 1 and bolt 2 are installed on the cable, and the clamp and bolt 2 are tightened with multiple levels of tightening force. The gap width 3 between the two halves of the clamp is recorded under each level of tightening force. To avoid the influence of "crosstalk effect", clamps with fewer bolts can be selected as test clamps. All bolts are tightened simultaneously with multiple levels of tightening force. At this time, the tightening force of each level of bolts can be obtained by converting the bolt tension hydraulic value or the tension-torsion relationship of the bolts. It is not necessary to measure the bolt tightening force with special equipment. The gap width 3 of the clamp can be accurately measured with vernier calipers. Multiple measuring points can be evenly arranged at different positions of the clamp body 1, and the average gap width 3 is taken after measuring each point. The result is shown in the figure. Figure 4 The diagram shown illustrates the relationship between bolt tightening force and cable clamp gap width value 3. Figure 4 The horizontal axis represents the total bolt tightening force, and the vertical axis, "stop gap width," is the averaged value of the cable clamp gap. The experimentally measured data for the relationship between the tightening force of the cable clamps and the gap width (stop gap width) of the two halves of the cable clamps are shown in Figure 4. Figure 4 As shown. The purpose of conducting multiple sets of tests is to ensure that the experimental results are generally representative.

[0100] (2) Establish such Figure 5 The numerical model shown is used to analyze the fastening effect of the cable clamp and cable. The numerical model has the same dimensions as the actual cable and cable clamp in the test of step (1). The cable 6 is simulated using a multilinear elastic material constitutive model. Adjustments are made as follows: Figure 6 The equivalent stress-strain curve of the cable material model, shown in Figure 9, continues until the trend of the relationship between the simulated clamping force and the gap width between the two clamp halves (Figure 5) becomes consistent with the measured relationship. This indicates that the cross-sectional compressive deformation characteristics of the cable numerical model under bolt tightening force are consistent with those of the actual cable, meaning the nonlinear lateral stiffness characteristics of the cable numerical model are consistent with those of the actual cable. Therefore, the numerical model can effectively simulate the "crosstalk effect" during asynchronous bolt tightening. Figure 57 in the model is the cable clamp model, and 8 is the cable clamp bolt model.

[0101] (3) Adopting such Figure 7 The simulation optimization algorithm for the cable clamp bolt group tightening process shown determines the full-process information of the optimal cable clamp bolt group tightening procedure. In the optimization algorithm, the overtension rate α is set to 1.1, the positive error rate limit ζ of the bolt residual tension is set to 0.1, and the minimum adjustment amount ΔF of the tightening force is set to 10kN. The numerical model used in the simulation is from the paper "Nonlinear interaction effect on main cable clamp bolts tightening in suspension bridge" [J]. Journal of Constructional Steel Research 2021, 182: 106663. Wherein, the residual tension F... R It is also determined through this process.

[0102] During the first tightening, the tightening force F = F_tightening force on the last bolt tightened. t F t For the target tightening force, the tightening force of other bolts is F = αF. t α is the overtension ratio. After solving one tightening process, output the remaining tension F of each bolt. R And make a judgment, if there is at least one bolt F R <F t Then repeat the above process, increasing the number of tightening passes until there are no bolts left at F. R <F t Then perform a second layer of checks: whether each bolt is F. R >(1+ζ)F t ζ is F R Relative to F t The positive error rate limit is set. If the limit is exceeded, it is considered that the tension is too large and does not meet the uniformity requirement. At this time, the tightening force of the bolt is updated to F. cur =αF t -iΔF, where ΔF is the minimum adjustment amount of the tightening force and i is the multiplier. The simulation analysis is repeated until the remaining tension of all bolts does not exceed the limit. The simulation analysis ends.

[0103] Simulation optimization results are as follows Figure 8 As shown, the horizontal axis “B1~B7” represents rows 1 to 7 of bolts in test clamp 1, and “P1~P3” represents the number of bolt tightening cycles from the 1st to the 3rd. Figure 8 As can be seen, each row of bolts requires a "tension value" of 10 in each tightening cycle, and at least 3 tightening cycles are needed to ensure that the remaining tension of each bolt meets the target requirements.

[0104] (4) Perform a bolt tightening test on the cable clamp bolt group according to the bolt tightening procedure determined in step (3). The test tension force is consistent with the "tension value" 10 determined by simulation. The test results are as follows: Figure 8 As shown, the "locking value" 11 is similar to the "tension value" 10, and the variation and distribution patterns of the "residual value - measured value" 12 are similar to the patterns of the simulation result "residual value - FEM" 13, indicating that the model simulation effectively reflects the "crosstalk effect" of asynchronous bolt group tightening. At the end of the tightening process, the final measured bolt residual tension value tends to be consistent with the simulation result, indicating that by following the steps of the technical solution of this invention, the goal of achieving the tightening force target that meets the positive error rate limit requirement for the bolt group is achieved with the fewest tightening cycles. The tension value is the tightening force value required for each row of bolts in each tightening cycle determined by simulation. The bolt tension force used in the experiment is controlled according to this value. The locking value is the actual tightening force value obtained by the bolts after tightening the nut and releasing the tension hydraulic pressure. This value is usually approximately equal to the tension control force value. The residual value - measured value is the measured residual tightening force value of each row of bolts at the end of each tightening cycle in the experiment. The residual value - FEM is the residual tightening force value of each row of bolts at the end of each tightening cycle in the simulation analysis.

[0105] This invention obtains measured data on the mechanical properties of the cable cross-section under the clamping force; it uses a numerical method based on a multilinear elastic material constitutive model to simulate the stiffness of the main cable cross-section, adjusting the numerical material stiffness of the main cable to simulate and fit the measured cable cross-section deformation behavior; and it determines the clamping process parameters of the clamp bolt group through a simulation optimization algorithm. The cable cross-section mechanical property simulation method used in this invention can accurately simulate the compressive deformation behavior of the cable cross-section during the application of the clamp bolt clamping force, thus effectively simulating the crosstalk effect of asynchronous clamping of the bolt group. Using the method and system provided by this invention, the optimal clamping process parameters for the bolt group required for clamping can be determined, which helps to ensure the quality of clamping and improve the efficiency of clamping construction, ensuring the quality of clamp bolt group clamping construction and saving labor costs.

[0106] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0107] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An optimized construction method for fastening cable clamp bolt groups, characterized in that, include: Obtain the rigidity characteristics of the cable cross section under the action of clamping force; Numerical models of the cable clamp and cable are constructed based on the rigidity characteristics of the cable cross-section under the clamping force. Based on the numerical model of the cable clamp and cable, the bolts are tightened and optimized to obtain the required number of tightening passes and the required tightening force of the bolts. The step of tightening and optimizing the bolts based on the numerical model of the cable clamp and cable to obtain the required number of tightening passes and the required tightening force of the bolts specifically includes: tightening the numerical model of the cable clamp and cable according to the set tightening force to obtain the number of tightening passes and the remaining tensile force of each bolt; The system determines whether at least one of the remaining tensile forces of each bolt is less than the target tightening force, obtaining a first determination result. If the first determination result indicates yes, the tightening pass count is incremented by one, and the process returns to the step "tighten the cable clamp and cable numerical model according to the set tightening force to obtain the tightening pass count and the remaining tensile force of each bolt". If the first determination result indicates no, the system determines whether the remaining tensile force of each bolt is greater than the set tensile force, obtaining a second determination result. If the second determination result indicates yes, the set tightening force of the bolt is updated using the updated tightening force, and the process returns to the step "tighten the cable clamp and cable numerical model according to the set tightening force to obtain the tightening pass count and the remaining tensile force of each bolt". If the second determination result indicates no, the required tightening force of the bolt is determined based on the set tightening force and the tightening pass count, and the tightening pass count is determined as the required tightening pass count of the bolt. The cable clamps and bolts installed on the cable are tightened according to the required number of tightening passes and the required tightening force of the bolts.

2. The optimized construction method for fastening cable clamp bolt groups according to claim 1, characterized in that, The acquisition of the cable cross-sectional rigidity characteristics under the action of the clamping force specifically includes: The relationship between clamping force and cable cross-sectional deformation was tested using clamps and bolts installed on the cable to obtain the rigidity characteristics of the cable cross-section under clamping force.

3. The optimized construction method for fastening cable clamp bolt groups according to claim 1, characterized in that, The construction of numerical models of the cable clamp and cable based on the rigidity characteristics of the cable cross-section under the clamping force specifically includes: Construct constitutive models for elastic materials; The stress-strain data of the constitutive model of the elastic material are adjusted according to the rigidity characteristics of the cable cross-section under the clamping force to obtain the numerical model of the clamp and the cable.

4. The optimized construction method for fastening cable clamp bolt groups according to claim 1, characterized in that, The formula for calculating the updated fastening force is: F cur =αF t -iΔF Among them, F cur To update the fastening force, α is the overtension law, F t Let i be the target fastening force, i be the multiple, and ΔF be the minimum adjustment amount of the fastening force.

5. An optimized construction system for fastening cable clamp bolt groups, characterized in that, include: The acquisition module is used to acquire the rigidity characteristics of the cable cross section under the action of the cable clamping force; The construction module is used to construct numerical models of the cable clamp and cable based on the rigidity characteristics of the cable cross-section under the clamping force. The fastening and optimization module is used to fasten and optimize bolts according to the numerical model of the cable clamp and cable, to obtain the required number of fastening passes and the required fastening force for the bolts. Specifically, the fastening and optimization module includes: a fastening unit, used to fasten the numerical model of the cable clamp and cable according to a set fastening force, to obtain the number of fastening passes and the remaining tension of each bolt; a first judgment unit, used to determine whether at least one of the remaining tensions of each bolt is less than the target fastening force, to obtain a first judgment result; and a return unit, used to, if the first judgment result indicates yes, increment the number of fastening passes by one and return to the step "fasten the numerical model of the cable clamp and cable according to the set fastening force, to obtain the required number of fastening passes and the required fastening force for the bolts". The system comprises: a first determination unit, which determines whether the remaining tension of each bolt is greater than a set tension if the first determination result indicates no; an update unit, which updates the set tightening force of the bolts using an updated tightening force if the second determination result indicates yes, and returns to the step "tightening the cable clamp and cable numerical model according to the set tightening force to obtain the number of tightening passes and the remaining tension of each bolt"; and a determination unit, which determines the required tightening force of the bolts based on the set tightening force and the number of tightening passes if the second determination result indicates no, and determines the number of tightening passes as the required number of tightening passes for the bolts. The fastening module is used to fasten the cable clamp and bolt installed on the cable according to the required number of tightening passes and the required tightening force of the bolt.

6. The cable clamp bolt group fastening construction optimization system according to claim 5, characterized in that, The acquisition module specifically includes: The acquisition unit is used to conduct a test on the relationship between the clamping force and the cross-sectional deformation of the cable based on the clamps and bolts installed on the cable, and to obtain the rigidity characteristics of the cable cross-section under the action of the clamping force.

7. The cable clamp bolt group fastening construction optimization system according to claim 5, characterized in that, The construction module specifically includes: Building blocks are used to construct constitutive models of elastic materials; The adjustment unit is used to adjust the stress-strain data of the constitutive model of the elastic material according to the rigidity characteristics of the cable cross-section under the clamping force of the cable clamp, so as to obtain the numerical model of the cable clamp and the cable.

8. The cable clamp bolt group fastening construction optimization system according to claim 5, characterized in that, The formula for calculating the updated fastening force is: F cur =αF t -iΔF Among them, F cur To update the fastening force, α is the overtension law, F t Let i be the target fastening force, i be the multiple, and ΔF be the minimum adjustment amount of the fastening force.

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