Construction method of curved cylindrical cable membrane composite structure system

Abstract

The application discloses a construction method of a curved cylindrical cable-membrane combined structure system, the cable-membrane combined structure system is a curved cylindrical structure with a concave middle part, a steel truss structure is arranged on the upper part of the cylinder, a cable net is connected with the steel truss structure, the cable net comprises a plurality of radial cables and ring cables, the radial cables and the ring cables are arranged in a cross mode to form a grid, and the construction method comprises the following steps: S1, installing the steel truss structure and forming an initial frame; S2, arranging an operation platform and a lifting tool frame and setting a lifting point; S3, connecting the radial cables with the lifting tool frame and lifting the radial cables to make the radial cables separate from the ground; S4, determining a cable net lifting and tensioning scheme: lifting the cable net to a design height in stages, synchronously installing the ring cables, and symmetrically tensioning the radial cables in stages and in batches; S5, synchronously performing simulation calculation and analysis; S6, based on the simulation calculation and analysis results, lifting and tensioning the cable net, and finally completing cable net forming; and S7, installing a membrane structure and adjusting cable net tension.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable-membrane combined structure system installation, in particular to a construction method of a curved cylindrical cable-membrane combined structure system. BACKGROUND

[0002] A certain project is composed of three structural forms of steel structure, cable net structure and membrane structure, forming a curved cylindrical shape with a concave middle. Since the cable net structure form is relatively rare in actual projects, there are few cases to learn from. The construction has the following problems:

[0003] 1. High structural complexity: difficult to coordinate construction of steel structure, cable net and membrane structure;

[0004] 2. Difficult to control construction precision: large deformation may occur during cable net lifting and tensioning, affecting the safety of the structure.

[0005] 3. Complex overall lifting process, large number of cables, high requirements for lifting and tensioning process.

[0006] 4. There may be cross operation between cable laying work and civil construction, the space is small, and there may be cable passing through the floor, leaving little space for cable laying, making cable net assembly difficult. SUMMARY

[0007] The purpose of the present application is to provide a construction method of a curved cylindrical cable-membrane combined structure system to solve the problems raised in the background.

[0008] To achieve the above purpose, the present application provides a construction method of a curved cylindrical cable-membrane combined structure system. The cable-membrane combined structure system is a curved cylindrical structure with a concave middle. The upper part of the cylinder is a steel truss structure, which includes multiple single-piece main trusses arranged uniformly in a ring shape. The multiple single-piece main trusses are connected by inner ring trusses and struts. The lower cylinder is a cable net structure, which is fixed to a circular concrete foundation at the lower part and connected to the steel truss structure at the upper part. The cable net includes multiple radial cables and ring cables, which are arranged in a grid pattern. The membrane material is attached to the cable net to form a curved cylindrical membrane structure.

[0009] The construction method includes the following steps:

[0010] S1, install the steel truss structure and form an initial frame;

[0011] S2, arrange the operation platform and lifting tool holder, and set the lifting points on the steel truss structure;

[0012] S3, connect the radial cables to the lifting tool holder and lift them off the ground;

[0013] S4, determine the cable net lifting and tensioning scheme: lifting the cable net to the design height in stages, synchronously installing the ring cable, and symmetrically tensioning the radial cable in stages and batches;

[0014] S5, synchronously performing simulation calculation and analysis;

[0015] S6, based on the simulation calculation and analysis results, lifting and tensioning the cable net, and finally completing the cable net forming;

[0016] S7, installing the membrane structure and adjusting the cable net tension.

[0017] In a preferred embodiment, the steel truss structure includes 24 single-piece main trusses, the inner side ends of the 24 single-piece main trusses are connected through an inner ring truss, the cable net includes a plurality of radial cables and a plurality of ring cables, the radial cables are uniformly and evenly arranged in a circular ring shape, the radial cables and the ring cables intersect through circular cable clamps to form an overall force cable net, upper ends of the radial cables are non-adjustable cable heads, and lower ends of the radial cables are adjustable cable heads.

[0018] In a preferred embodiment, in step S2, the operation platform and the lifting tool frame are arranged, and lifting points are arranged on the steel truss structure, including: S21, arranging the operation platform on the steel truss structure, installing the hydraulic synchronous lifting system equipment, symmetrically arranging 8 lifting points on the inner ring truss, arranging the lifting tool frame at the projection position of the 8 lifting points below the steel truss structure, and correspondingly arranging 8 lower lifting points, wherein the lifting tool frame is arranged as a ring-shaped beam; S22, connecting the lifting tool frame and the lifting points through 8 steel strands, and the 8 lifting points correspond to positions of 2 single-piece main trusses located on the outer side among 4 single-piece main trusses; S23, spreading 72 radial cables radially on the ground.

[0019] In a preferred embodiment, in step S4, the cable net is lifted to the design height in stages, and the ring cable is synchronously installed, including: S41, lifting the radial cable to a first height away from the ground, and installing the first ring cable; S42, continuing to lift the cable net to a second height through the lifting tool frame, and installing the second ring cable; S43, continuing to lift the cable net to a third height through the lifting tool frame 3, and installing the third ring cable; S44, continuing to lift the cable net to a ninth height, until the ninth ring cable is installed; S45, continuing to lift the cable net to a tenth height, and installing the tenth ring cable; S46, continuing to lift to the position of the inner ring truss, and abuttingly installing the radial cable on the steel truss structure to form an overall structure; S47, after the abutting installation is completed, the hydraulic lifting system synchronously and slowly unloads in stages through the lifting points; S48, removing the hydraulic lifting equipment, and the overall cable net lifting and installation are completed; wherein the first height to the ninth height are the same height, and the tenth height is greater than the ninth height.

[0020] In a preferred embodiment, in step S4, the step of grading and batch symmetrically tensioning the radial cables comprises: tensioning the cables at the lower end of the radial cables, grading and batch tensioning the radial cables, the tensioning is divided into three stages, the first stage is pre-tightening the cables, the second stage is tensioning to 80% of the design force value, and the third stage is tensioning to 100% of the design force value, each stage of tensioning is divided into nine groups, and each group has eight radial cables, and the order of tensioning in each stage is: the first group is tensioned to eight radial cables arranged in a cross shape, two radial cables in each direction of the cross shape are arranged adjacent to each other, the second group is tensioned to two radial cables adjacent to the outside of the two radial cables that have been tensioned in each direction, respectively, the third group is tensioned to two radial cables adjacent to the outside of the four radial cables that have been tensioned, and so on, until the eight radial cables of the ninth group are tensioned.

[0021] In a preferred embodiment, in step S5, the step of performing simulation calculation and analysis verification comprises: S51, establishing a finite element calculation model, the finite element model adopts a structure overall model, the boundary conditions are consistent with the actual structure, only the self weight of the structure during the installation and lifting of the cable net, and the weight of the cable clamp node is considered, the self weight coefficient is 1.1; S52, performing simulation analysis of the whole construction process to obtain simulation analysis results, the simulation analysis results include the displacement of the steel truss in the lifting process, the vertical displacement of the cable net in the tensioning process, the stress of the steel truss, the internal force of the lifting cable, the internal force of the radial cable, and the internal force of the ring cable, and the shape data and the internal force of the cable obtained by the simulation analysis of the construction are compared with the design displacement and the internal force of the cable, and the deviation of the construction displacement and the internal force of the cable is controlled within ±10%.

[0022] In a preferred embodiment, in step 3, the step of performing simulation analysis of the whole construction process comprises the following steps:

[0023] S521, the steel truss is constructed, and the maximum displacement of the steel truss is calculated;

[0024] S522, the radial cables and the lifting tool frame are connected and lifted by 2.1 m, and the maximum displacement and the maximum stress of the steel truss are calculated;

[0025] S523, the first ring cable is connected, and the lifting is continued by 2.1 m, and the maximum displacement and the maximum stress of the steel truss are calculated;

[0026] S524, the second ring cable is connected, and the lifting is continued by 2.1 m, and the maximum displacement and the maximum stress of the steel truss are calculated;

[0027] S525, the third ring cable is connected, and the lifting is continued by 2.1 m, and the maximum displacement and the maximum stress of the steel truss are calculated;

[0028] S526, the above steps are repeated until the ninth ring cable is installed, and the maximum displacement and the maximum stress of the steel truss are calculated;

[0029] S527, continue to lift to 26m, the 10th ring cable installation is completed, and the maximum displacement of the steel truss and the maximum stress of the lifting tool frame are calculated;

[0030] S528, the radial cable installation is installed in place, the first stage of radial cable pre-tightening is performed, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0031] S529, the second stage of the first group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0032] S530, the second stage of the second group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0033] S531, the second stage of the third group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0034] S532, the second stage of the fourth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0035] S533, the second stage of the fifth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0036] S534, the second stage of the sixth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0037] S535, the second stage of the seventh group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0038] S536, the second stage of the eighth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0039] S537, the second stage of the ninth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated;

[0040] S538, the third stage of tensioning is completed, the ring cable force is fine-tuned, the cable net is formed, and the maximum vertical displacement of the steel truss and the maximum stress of the steel truss are calculated.

[0041] In a preferred embodiment, in step S52, the whole construction process simulation analysis also includes: in steps S522 to S527, the lifting force value of each lifting point in each step is calculated; in steps S529 to S538, the maximum radial cable internal force of each step is calculated; in steps S528 to S538, the maximum ring cable internal force of each step is calculated.

[0042] In a preferred embodiment, in step S6, based on the simulation calculation and analysis results, the lifting and tensioning of the cable net is carried out, including: based on the simulation calculation and analysis results, verifying the feasibility of the lifting and tensioning scheme, selecting the tensioning tools, determining the tensioning sequence, and laying the film material after the cable net is formed, so that the film material is arranged to adhere to the cable net 2 to form a curved cylindrical film structure, and the curved surface precision is controlled by adjusting the cable net tension.

[0043] Compared with the prior art, the beneficial effects of the present application are:

[0044] By setting the lifting points and lifting tool frames, the cable net is lifted to the designed height in stages, the ring cables are installed synchronously, and the radial cables are tensioned in three stages in batches and symmetrically, and by combining with the simulation analysis of the whole construction process, the lifting force of each tensioning step, the deformation of each tensioning step structure, and the construction simulation position data and the cable internal force are compared with the designed displacement and the cable internal force, and the construction displacement and the cable internal force deviation are controlled within ±10%. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 The construction method flow chart of the present application;

[0046] Figure 2 The curved cylindrical cable membrane combined structure system structure schematic diagram of the present application;

[0047] Figure 3 The steel truss structure schematic diagram of the present application;

[0048] Figure 4 The cable net structure schematic diagram of the present application;

[0049] Figure 5 The lifting tool frame setting schematic diagram of the present application;

[0050] Figure 6 The first ring cable installation schematic diagram of the present application;

[0051] Figure 7 The overall schematic diagram of the present application for butt jointing and installing the radial cables on the steel truss structure;

[0052] Figure 8 The lifting point arrangement schematic diagram of the present application;

[0053] Figure 9 The radial cable is divided into nine groups to complete each level tensioning schematic diagram of the present application;

[0054] Figure 10 The finite element calculation model schematic diagram of the present application;

[0055] Figure 11Simulation results of the displacement of the lifting process after the installation of the 10th ring cable of the present application;

[0056] Figure 12 Simulation results of the displacement of the lifting process after the installation of the 10th ring cable of the present application;

[0057] Figure 13 Simulation results of the displacement of the tensioning process after the installation of the radial cable of the present application and the first-stage pre-tightening;

[0058] Figure 14 Simulation results of the displacement of the tensioning process after the tensioning of the second-stage first group of radial cable of the present application;

[0059] Figure 15 Simulation results of the displacement of the tensioning process after the tensioning of the second-stage ninth group of radial cable of the present application;

[0060] Figure 16 Simulation results of the displacement of the tensioning process after the completion of the third-stage tensioning and the formation of the cable net of the present application;

[0061] Figure 17 Simulation results of the stress of the steel truss structure after the installation of the radial cable of the present application and the first-stage pre-tightening;

[0062] Figure 18 Simulation results of the stress of the steel truss structure after the tensioning of the second-stage first group of radial cable of the present application;

[0063] Figure 19 Simulation results of the stress of the steel truss structure after the tensioning of the second-stage ninth group of radial cable of the present application;

[0064] Figure 20 Simulation results of the stress of the steel truss structure after the completion of the third-stage tensioning and the formation of the cable net of the present application;

[0065] Figure 21 Simulation results of the internal force of the lifting cable after the installation of the 10th ring cable of the present application;

[0066] Figure 22 Simulation results of the internal force of the radial cable after the completion of the third-stage tensioning and the formation of the cable net of the present application;

[0067] Figure 23 Simulation results of the internal force of the ring cable after the completion of the third-stage tensioning and the formation of the cable net of the present application. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present application will be described clearly and completely below. All other embodiments obtained by the person of ordinary skill in the art without making any creative labor belong to the protection scope of the present application.

[0069] As Figures 1 to 23 The construction method of the curved cylindrical cable-membrane combined structure system of the preferred embodiment of the present application is shown in the figure. The cable-membrane combined structure system is a curved cylindrical structure with a concave middle. The upper part of the cylinder is a steel truss structure 1, which includes multiple single-piece main trusses 11 arranged uniformly in a ring shape. The multiple single-piece main trusses 11 are connected by inner ring trusses 12 and struts 13. The lower part of the cylinder is a cable net structure. The lower part of the cable net 2 is fixed on a circular concrete foundation, and the upper part of the cable net 2 is connected to the steel truss structure 1. The cable net 2 includes multiple radial cables 21 and ring cables 22 arranged in a grid pattern. The membrane material is attached to the cable net 2 to form a curved cylindrical membrane structure. The steel truss structure 1 includes 24 single-piece main trusses 11, and the inner ends of the 24 single-piece main trusses 11 are connected by inner ring trusses 12. The cable net 2 includes 72 radial cables 21 and 10 ring cables 22. The radial cables 21 are arranged uniformly in a circular ring shape, and the intersection of the radial cables 21 and the ring cables 22 is connected by a circular cable clamp to form a whole force cable net. The upper ends of the radial cables 21 are non-adjustable cable heads 23, and the lower ends are adjustable cable heads 24. The upper chords and lower chords of the single-piece main trusses 11 are both arc-shaped. The inner ends of the upper chords and lower chords intersect at a point on the inner side of the steel truss structure. The outer ends of the upper chords and lower chords are vertically spaced on the outer side of the steel truss structure. Multiple diagonal support struts are arranged between the upper chords and lower chords.

[0070] The construction method of the curved cylindrical cable-membrane combined structure system of the present application includes the following steps:

[0071] Step S1, install the steel truss structure 1 and form an initial frame.

[0072] Step S2, arrange the operation platform and lifting tooling rack, and set the lifting points 14 on the steel truss structure 1.

[0073] Specifically, in step S2, the operation platform and lifting tooling rack 3 are arranged, and the lifting points are set on the steel truss structure 1, including: S21, setting the operation platform on the steel truss structure 1, installing the hydraulic synchronous lifting system equipment, symmetrically setting 8 lifting points 14 on the inner ring truss 12, setting the lifting tooling rack 3 at the projection position of the 8 lifting points 14 below the steel truss structure 1, and correspondingly setting 8 lower lifting points. Among them, the lifting tooling rack 3 is arranged as a ring beam; S22, connecting the lifting tooling rack 3 and the lifting points 14 by 8 steel strands 31, and the 8 lifting points 14 correspond to the positions of 2 single-piece main trusses 11 located on the outer side among the 4 single-piece main trusses 11; S23, spreading the 72 radial cables 21 radially on the ground.

[0074] Step S3, connect the radial cables 21 and the lifting tooling rack 3, and lift them to make them leave the ground.

[0075] Step S4, determine the cable net lifting and tensioning scheme: lift the cable net to the design height in stages, install the girdle cable 22 synchronously, and symmetrically tension the radial cable 21 in stages and batches.

[0076] In step S4, the cable net is lifted to the design height in stages, the girdle cable 22 is installed synchronously, including: S41, lifting the radial cable 21 to a first height away from the ground, and installing the first girdle cable 22; S42, continuing to lift the cable net to a second height by the lifting tool frame 3, and installing the second girdle cable 22; S43, continuing to lift the cable net to a third height by the lifting tool frame 3, and installing the third girdle cable; S44, continuing to lift the cable net to a ninth height, until the ninth girdle cable is installed; S45, continuing to lift the cable net to a tenth height, and installing the tenth girdle cable; S46, continuing to lift to the position of the inner ring truss 12, and abuttingly installing the radial cable on the steel truss structure to form an integral whole; S47, after the abutting installation is completed, the hydraulic lifting system is synchronously and gradually unloaded in stages at each lifting point; S48, the hydraulic lifting equipment is removed, and the integral lifting and installation of the cable net is completed; wherein the first height to the ninth height are the same height, and the tenth height is greater than the ninth height.

[0077] In step S4, the radial cable 21 is symmetrically tensioned in stages and batches, including: tensioning the radial cable 21 at the lower end, the radial cable 21 is tensioned in groups and stages, the tensioning is divided into three stages, the first stage is pre-tightening of the radial cable, the second stage is tensioned to 80% of the design force value, and the third stage is tensioned to 100% of the design force value, each stage of tensioning is divided into nine groups, and each group has eight radial cables, and the order of tensioning of each stage is: the first group is tensioned to eight radial cables arranged in a cross shape symmetrically, two radial cables in each direction of the cross shape are arranged adjacently, the second group is tensioned to two radial cables adjacent to the outside of the two radial cables that have been tensioned in each direction, the third group is tensioned to two radial cables adjacent to the outside of the four radial cables that have been tensioned, and the tensioning is sequentially performed on the eight radial cables of the ninth group.

[0078] Step S5, simulation calculation and analysis are synchronously performed.

[0079] In step S5, the simulation calculation and analysis verification are performed, including: S51, establishing a finite element calculation model 501, the finite element model adopts a structure integral model, the boundary conditions are consistent with the actual structure, only the structure self-weight is considered in the process of cable net installation and lifting, and the weight of the cable clamp node is considered, and the self-weight coefficient is 1.1.

[0080] Specifically, the Midas model is established, including:

[0081] Step S511, structure modeling range:

[0082] Geometry model: Linear model is built by CAD, including ring beam of steel structure (elevation 27.3m, diameter 59.88m) and cable net cylinder (anchored at the circular foundation with elevation-5.9m, connected to the elevation 22.2m).

[0083] Element type: Steel truss structure: beam element is used to simulate main truss and inner ring truss; cable net: only tensile element is used to simulate radial cable and ring cable, which can be used for nonlinear analysis;

[0084] Boundary condition: cable and steel truss structure are hinged.

[0085] Step S512, material parameters:

[0086] Steel truss structure: Q355B steel, elastic modulus E=2.06×10 5 MPa; overall lifting tool frame: Q355B steel, elastic modulus E=2.06×10 5 MPa; cable net (radial cable / ring cable): high vanadium plated steel wire (diameter 40mm), elastic modulus E=1.8×10 5 MPa; lifting steel strand: D28 steel strand, elastic modulus E=1.68×10 5 MPa.

[0087] Step S513, boundary condition setting:

[0088] 1. Temporary support

[0089] Lifting stage: twelve temporary supports are set at the steel truss (elevation 22.2m), Midas is used to simulate the overall lifting tool frame and lifting steel strand, and the length of steel strand is simulated by heating and cooling to achieve the effect of lifting;

[0090] Tensioning stage: after removing the temporary support, only the anchoring constraint of foundation and cable net is reserved.

[0091] 2. Load application

[0092] Constant load: self weight of steel structure (including weight of cable clamp) and self weight of cable net (calculated according to 1.1 times coefficient).

[0093] 3. Establishment of construction steps

[0094] Steel structure and cable are grouped, and the elements of the step are activated respectively in different construction steps.

[0095] Step S52, construction whole process simulation analysis is carried out, simulation analysis result is obtained, simulation analysis result includes lifting process steel truss displacement, tensioning process cable net vertical displacement, steel truss stress, lifting cable internal force, radial cable internal force, ring cable internal force, and construction simulation analysis shape data and cable internal force are compared with design displacement and cable internal force, construction displacement and cable internal force deviation are controlled within ±10%.

[0096] Specifically, in step S52, the whole construction process simulation analysis is performed, including the following steps: S521, the steel truss construction is completed, and the maximum displacement of the steel truss is calculated; S522, the radial cable and the lifting tool frame are connected and lifted by 2.1 m, and the maximum displacement and the maximum stress of the steel truss are calculated; S523, the first ring cable is connected, and the lifting is continued by 2.1 m, and the maximum displacement and the maximum stress of the steel truss are calculated; S524, the second ring cable is connected, and the lifting is continued by 2.1 m, and the maximum displacement and the maximum stress of the steel truss are calculated; S525, the third ring cable is connected, and the lifting is continued by 2.1 m, and the maximum displacement and the maximum stress of the steel truss are calculated; S526, the above steps are repeated until the ninth ring cable is installed, and the maximum displacement of the steel truss and the maximum stress of the lifting tool frame are calculated; S527, the lifting is continued to 26 m, and the tenth ring cable is installed, and the maximum displacement of the steel truss and the maximum stress of the lifting tool frame are calculated; S528, the radial cable is installed in place, the first stage pre-tightening of the radial cable is performed, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S529, the second stage first group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S530, the second stage second group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S531, the second stage third group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S532, the second stage fourth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S533, the second stage fifth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S534, the second stage sixth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S535, the second stage seventh group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S536, the second stage eighth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S537, the second stage ninth group of radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S538, the third stage tensioning is completed, the ring cable force is fine-tuned, the cable net is formed, and the maximum vertical displacement of the steel truss and the maximum stress of the steel truss are calculated. In step S52, the whole construction process simulation analysis is also performed, including: in steps S522 to S527, the lifting force value of each lifting point of each step is calculated; in steps S529 to S538, the maximum radial cable internal force of each step is calculated; in steps S528 to S538, the maximum ring cable internal force of each step is calculated.

[0097] S53, cable net forming verification

[0098] Final state check: the vertical displacement of the steel truss is less than or equal to L / 600 (L = diameter 59.88 m → displacement limit ≈ 100 mm); the cable force deviation is less than or equal to 1%, and the ring cable internal force is uniformly distributed (the ratio of the maximum value to the minimum value is less than or equal to 1.1).

[0099] S54, simulation calculation analysis result

[0100] Through simulation calculation analysis, the cable net is provided with 8 lifting points, the lifting force value of each point is maximum 41kN, the safety factor of the lifting steel strand is 6.3; the maximum stress of the steel truss in the lifting process is 20MPa, the maximum stress of the ring beam of the lifting frame is-77Mpa; all meet the bearing capacity requirement, and the lifting scheme is feasible. The maximum vertical displacement of the steel truss lifting point in the cable net lifting process is-3mm, and the maximum vertical displacement of the steel truss after the tensioning is completed is-23mm, and the deformation meets the requirement. The maximum compressive stress of the steel truss after the cable net is lifted in place is-15MPa, and the maximum tensile stress is 18MPa. After the cable tensioning is completed, the maximum compressive stress of the steel truss is-135MPa, and the maximum tensile stress is 192MPa, which meets the bearing capacity requirement. The radial cable tensioning is carried out in three stages, the first stage is to pre-tighten the cable; the second stage tensioning radial cable maximum tension value is 160kN, ring cable maximum tension value is 403kN; the third stage tensioning radial cable maximum tension value is 209kN, after the radial cable tensioning is completed, the maximum internal force value of the ring cable is 520kN. The internal force value of the cable after the cable net is formed is within 1% of the design force value, which meets the specification requirement, and the scheme is feasible.

[0101] Step S6, based on the simulation calculation and analysis result, the cable net is lifted and tensioned, and the cable net is finally formed.

[0102] Specifically, in step S6, based on the simulation calculation and analysis result, the cable net is lifted and tensioned, including: based on the simulation calculation and analysis result, verifying the feasibility of the lifting and tensioning scheme, selecting tensioning equipment, determining the tensioning sequence, and laying the film material after the cable net is formed, so that the film material is attached to the cable net 2, forming a curved cylindrical film structure, and controlling the curvature precision by adjusting the cable tension.

[0103] The simulation calculation analysis result and the actual construction are compared as shown in the following table:

[0104] Parameter Simulation value (mm) Actual measurement value (mm) Deviation rate Maximum displacement of steel truss -23 -25 8.7% Radial cable force 209 kN 206 kN 1.25% Ring cable internal force 520 kN 515 kN 0.96%

[0105] 1, result analysis:

[0106] Displacement control: the deviation between the simulation prediction of-23mm and the actual measurement of-25mm is within a reasonable range, proving the reliability of the model;

[0107] Cable force uniformity: the internal force deviation of the radial cable and the ring cable is ≤1%, meeting the design requirement;

[0108] Stress safety reserve: the maximum stress of the steel truss structure is 192MPa

[0109] 2, model verification and optimization:

[0110] Parameter optimization:

[0111] Lifting trolley: H200*200*8 / 12 is used as the upper lifting ring, which can lift 72 radial cables synchronously, ensuring the symmetry of the construction process;

[0112] Adjustment of tensioning sequence: the tensioning of the 5th group of radial cables is moved forward to the 3rd group to avoid local stress concentration.

[0113] Conclusion:

[0114] Through the establishment of a refined finite element model and the simulation of 18 construction procedures, the following technical objectives are achieved:

[0115] Construction feasibility: the safety of the lifting force of 41 kN and the three-stage tensioning process is proved;

[0116] Precision control: the installation precision is controlled within ±5 mm.

[0117] Step S7, install the membrane structure and adjust the cable net tension.

[0118] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A construction method for a curved cylindrical cable-membrane composite structure system, characterized in that: The cable-membrane composite structure system is a curved cylindrical structure with a concave center. The upper part of the cylinder is a steel truss structure (1). The steel truss structure (1) includes multiple single main trusses (11) arranged in a ring with uniform intervals. The multiple single main trusses (11) are connected by an inner ring truss (12) and struts (13). The lower part of the cylinder is a cable net structure. The lower part of the cable net (2) is fixed on a circular concrete foundation. The upper part of the cable net (2) is connected to the steel truss structure (1). The cable net (2) includes multiple radial cables (21) and ring cables (22). The radial cables (21) and ring cables (22) are arranged in a cross pattern to form a grid. The membrane material is attached to the cable net (2) to form a curved cylindrical membrane structure. The construction method includes the following steps: S1. Install the steel truss structure (1) and form the initial frame; S2. Arrange the operating platform and lifting fixture, and set up lifting points (14) on the steel truss structure (1). S3. Connect the radial cable (21) and the lifting fixture (3) and lift it off the ground; S4. Determine the cable net lifting and tensioning scheme: lift the cable net to the design height in stages, install the ring cables (22) simultaneously, and tension the radial cables (21) in stages and batches symmetrically. S5. Simultaneously perform simulation calculations and analysis; S6. Based on the simulation calculation and analysis results, the cable net is lifted and tensioned, and finally the cable net (2) is formed; S7. Install the membrane structure and adjust the cable net tension; In step S4, the cable net is raised to the designed height in stages, and the ring cable (22) is installed simultaneously, including: S41, raising the radial cable (21) off the ground to the first height and installing the first ring cable (22); S42, raising the cable net to the second height using the lifting fixture (3) and installing the second ring cable (22); S43, raising the cable net to the third height using the lifting fixture (3) and installing the third ring cable; S44, raising the cable net to the ninth height until the ninth ring cable is installed; S45, raising the cable net to the tenth height and installing the tenth ring cable; S46, raising the cable net to the inner ring truss (12) position and connecting the radial cables to the steel truss structure to form a whole; S47, after the connection installation is completed, the hydraulic lifting system slowly unloads the cables at each lifting point in stages; S48, dismantling the hydraulic lifting equipment and completing the overall lifting and installation of the cable net; wherein, the first height to the ninth height are all the same height, and the tenth height is greater than the ninth height.

2. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 1, characterized in that: The steel truss structure (1) includes 24 single main trusses (11), and the inner ends of the 24 single main trusses (11) are connected by an inner ring truss (12). The cable net (2) includes 72 radial cables (21) and 10 ring cables (22). The radial cables (21) are arranged in a circular shape at uniform intervals. The intersection of the radial cables (21) and the ring cables (22) is connected by a circular cable clamp to form an integral stress cable net. The upper end of the radial cable (21) is a non-adjustable cable head (23), and the lower end is an adjustable cable head (24).

3. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 2, characterized in that: In step S2, the operating platform and lifting fixture (3) are arranged, and lifting points are set on the steel truss structure (1), including: S21, setting up the operating platform on the steel truss structure (1), installing the hydraulic synchronous lifting system equipment, symmetrically setting up 8 lifting points (14) on the inner ring truss (12), setting up the lifting fixture (3) at the projection position of the 8 lifting points (14) below the steel truss structure (1), and setting up 8 lower lifting points accordingly, wherein the lifting fixture (3) is set as a ring beam; S22, connecting the lifting fixture (3) and the lifting points (14) through 8 steel strands (31), the 8 lifting points (14) correspond to the positions of the 2 single main trusses (11) located on the outside of the 4 single main trusses (11); S23, spreading 72 radial cables (21) radially on the ground.

4. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 1, characterized in that: In step S4, the radial cables (21) are tensioned symmetrically in stages and batches, including: tensioning the cables at the lower end of the radial cables (21), the radial cables (21) are tensioned in groups and stages, and the tensioning is divided into 3 stages. The first stage is to pre-tighten the cables, the second stage is to tension to 80% of the design force value, and the third stage is to tension to 100% of the design force value. Each stage of tensioning is divided into nine groups, with 8 radial cables in each group. The tensioning sequence of each stage is as follows: the first group first tensions the 8 radial cables that are symmetrically arranged in a cross shape, with 2 radial cables in each direction of the cross shape being adjacent to each other. The second group tensions the 2 radial cables adjacent to the outside of the 2 radial cables that have been tensioned in each direction. The third group tensions the 2 radial cables adjacent to the outside of the 4 radial cables that have been tensioned in each direction. And so on, until the 8 radial cables in the ninth group are tensioned.

5. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 1, characterized in that: In step S5, simulation calculation and analysis verification are performed, including: S51, establishing a finite element calculation model. The finite element model adopts the overall structural model, and the boundary conditions are consistent with the actual structure. During the installation and lifting of the cable net, only the self-weight of the structure is considered, and the weight of the cable clamp nodes is also taken into account. The self-weight coefficient is 1.1; S52, performing simulation analysis of the entire construction process and obtaining simulation analysis results. The simulation analysis results include the displacement of the steel truss during the lifting process, the vertical displacement of the cable net during the tensioning process, the stress of the steel truss, the internal force of the lifting cable, the internal force of the radial cable, and the internal force of the ring cable. The configuration data and cable internal forces simulated in the construction simulation are compared with the design displacement and cable internal forces. The deviations of the construction displacement and cable internal forces are controlled within ±10%.

6. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 5, characterized in that: Step S52 involves conducting a simulation analysis of the entire construction process, including the following steps: S521. The steel truss construction is completed, and the maximum displacement of the steel truss is calculated; S522, radial cable and lifting fixture connected and lifted 2.1m, and calculate the maximum displacement and maximum stress of the steel truss; S523, Connect the first ring cable, continue lifting for 2.1m, and calculate the maximum displacement and maximum stress of the steel truss; S524. Connect the second ring cable, continue lifting for 2.1m, and calculate the maximum displacement and maximum stress of the steel truss; S525, Connect the third ring cable, continue lifting for 2.1m, and calculate the maximum displacement and maximum stress of the steel truss; S526. Repeat the above steps until the 9th ring cable is installed, and calculate the maximum displacement of the steel truss and the maximum stress of the lifting fixture. S527, Continue lifting to 26m, the 10th ring cable is installed, and the maximum displacement of the steel truss and the maximum stress of the lifting fixture are calculated; S528. After the radial cables are installed and in place, perform the first stage of pre-tightening of the radial cables, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss. S529, Tension the first group of radial cables of the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S530, tension the second group of radial cables of the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S531, tension the second-level third group of radial cables, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S532, tension the fourth group of radial cables of the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S533, tension the fifth group of radial cables of the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S534, tension the sixth group of radial cables of the second level, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S535, tension the seventh group of radial cables of the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S536, tension the second-level eighth group of radial cables, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S537, tension the second-level ninth group of radial cables, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S538. The third stage of tensioning is completed, the cable tension of the ring cable is finely adjusted, the cable net is formed, and the maximum vertical displacement and maximum stress of the steel truss are calculated.

7. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 6, characterized in that: In step S52, the simulation analysis of the entire construction process is carried out, which also includes: in steps S522 to S527, the lifting force value of each lifting point in each step is calculated respectively; in steps S529 to S538, the maximum value of the radial cable internal force in each step is calculated respectively; in steps S528 to S538, the maximum value of the circumferential cable internal force in each step is calculated respectively.

8. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 7, characterized in that: In step S6, based on the simulation calculation and analysis results, the cable net is lifted and tensioned, including: based on the simulation calculation and analysis results, verifying the feasibility of the lifting and tensioning scheme, selecting tensioning equipment, determining the tensioning sequence, and laying membrane material after the cable net is formed so that the membrane material fits the cable net (2) setting to form a curved cylindrical membrane structure, and controlling the surface accuracy by adjusting the cable net tension.

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