Construction method of curved-surface cylindrical cable-membrane composite structure system

Abstract

The invention discloses a construction method of a curved-surface cylindrical cable-membrane composite structure system.The cable-membrane composite structure system is of a curved-surface cylinder structure with the middle concave inwards, a circle of the upper portion of the cylinder is of a steel truss structure, the upper portion of a cable net is connected with the steel truss structure, the cable net comprises a plurality of radial cables and annular cables, and the radial cables and the annular cables are arranged in a crossed mode to form grids; the construction method comprises the following steps that S1, the steel truss structure is installed, and an initial frame is formed; s2, an operation platform and a lifting tool frame are arranged, and a lifting point is set; s3, the radial cable and the lifting tool frame are connected and lifted to be separated from the ground; s4, a cable net lifting and tensioning scheme is determined, specifically, the cable net is lifted to the designed height in a staged mode, annular cables are synchronously installed, and radial cables are symmetrically tensioned in a staged and batched mode; s5, synchronously performing simulation calculation and analysis; and S6, based on the simulation calculation and analysis result, lifting and tensioning of the cable net are conducted, and finally cable net forming is completed. And S7, a membrane structure is installed, and the tension of the cable net is adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of cable-membrane composite structure system installation, and in particular to a construction method of a curved cylindrical cable-membrane composite structure system. Background Art

[0002] A certain project consists of three structural forms: steel structure + cable net structure + membrane structure, forming a curved cylindrical shape with a concave center. Since this cable net structure is relatively rare in actual projects, there are not many cases to refer to. Its construction has the following problems: 1. High structural complexity: The coordinated construction of steel structure, cable net and membrane structure is difficult; 2. Construction accuracy is difficult to control: large deformation is likely to occur during the lifting and tensioning of the cable net, affecting the safety of the structure.

[0003] 3. The overall lifting process is complex, with a large number of cables, and high requirements for the lifting and tensioning process.

[0004] 4. The cable laying work may overlap with the civil construction. The site space is small and the cables may pass through the floor slabs, leaving little space for the cable laying, making the cable net assembly difficult. Summary of the invention

[0005] The object of the present invention is to provide a construction method of a curved cylindrical cable-membrane composite structure system to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides a construction method of a curved cylindrical cable-membrane composite structure system, wherein the cable-membrane composite structure system is a curved cylindrical structure with a concave middle portion, wherein a circle on the upper portion of the cylinder is a steel truss structure, wherein the steel truss structure comprises a plurality of single-piece main trusses arranged in a ring shape and evenly spaced, wherein the plurality of single-piece main trusses are connected by inner ring trusses and struts, wherein the lower cylinder is a cable net structure, wherein the lower portion of the cable net is fixed on a circular concrete foundation, and the upper portion of the cable net is connected to the steel truss structure, wherein the cable net comprises a plurality of radial cables and ring cables, wherein the radial cables and the ring cables are cross-arranged to form a grid, and wherein the membrane material is arranged in affixed relation to the cable net to form a curved cylindrical membrane structure; The construction method includes the following steps: S1. Install the steel truss structure and form the initial frame; S2. Arrange the operating platform and lifting tool frame, and set the lifting points on the steel truss structure; S3, connecting the radial cable to the lifting fixture frame, and lifting it off the ground; S4. Determine the cable net lifting and tensioning plan: lift the cable net to the designed height in stages, install the ring cables simultaneously, and tension the radial cables symmetrically in stages and batches; S5, perform simulation calculation and analysis simultaneously; S6. Based on the simulation calculation and analysis results, lift and tension the cable net, and finally complete the formation of the cable net. S7. Install the membrane structure and adjust the cable net tension.

[0007] In a preferred embodiment, the steel truss structure includes 24 single-piece main trusses. The inner ends of the 24 single-piece main trusses are connected by an inner ring truss. The cable net includes root radial cables and root ring cables. The radial cables are arranged at uniform intervals in a circular shape. The intersection of the radial cables and the ring cables is connected by circular cable clamps to form an integral force-bearing cable net. The upper end of the radial cable is a non-adjustable cable head, and the lower end is an adjustable cable head.

[0008] In a preferred embodiment, in step S2, arrange the operation platform and the lifting tooling frame, and set lifting points on the steel truss structure, including: S21. Set the operation platform on the steel truss structure, install the hydraulic synchronous lifting system equipment, symmetrically set 8 lifting points on the inner ring truss, set the lifting tooling frame at the projection positions of the 8 lifting points below the steel truss structure, and correspondingly set 8 lower lifting points. Among them, the lifting tooling frame is set as an annular beam; S22. Connect the lifting tooling frame and the lifting points through 8 steel strands. The 8 lifting points respectively correspond to the positions of 2 single-piece main trusses located on the outer side among 4 single-piece main trusses; S23. Unfold 72 radial cables radially on the ground.

[0009] In a preferred embodiment, in step S4, lift the cable net to the design height in stages and synchronously install the ring cables, including: S41. Lift the radial cables off the ground to the first height and install the first ring cable; S42. Continue to lift the cable net to the second height through the lifting tooling frame and install the second ring cable; S43. Continue to lift the cable net to the third height through the lifting tooling frame 3 and install the third ring cable; S44. Continue to lift the cable net to the ninth height until the ninth ring cable is installed; S45. Continue to lift the cable net to the tenth height and install the tenth ring cable; S46. Continue to lift to the position of the inner ring truss and dock and install the radial cables on the steel truss structure to form an integral; S47. After the docking and installation are completed, the lifting points of the hydraulic lifting system are synchronously and gradually unloaded slowly; S48. Remove the hydraulic lifting equipment, and the overall lifting and installation of the cable net is completed; among them, the first height to the ninth height are all the same height, and the tenth height is greater than the ninth height.

[0010] In a preferred embodiment, in step S4, the radial cables are symmetrically tensioned in batches and grades, including: tensioning the cables at the lower end of the radial cables. The radial cables are tensioned in groups and grades. The tensioning is divided into three levels. In the first level, the cables are pre-tightened. In the second level, the tension is increased to 80% of the design force value. In the third level, the tension is increased to 100% of the design force value. Each level of tensioning is divided into nine groups, with 8 radial cables in each group. The sequence of tensioning for each level is as follows: In the first group, the 8 radial cables arranged symmetrically in a cross shape are tensioned first. The 2 radial cables in each direction of the cross are adjacent to each other. In the second group, 2 radial cables adjacent to the outside of the 2 already tensioned radial cables in each direction are respectively tensioned. In the third group, 2 radial cables adjacent to the outside of the 4 already tensioned radial cables are respectively tensioned, and so on, until the 8 radial cables in the ninth group are tensioned.

[0011] In a preferred embodiment, in step S5, simulation calculation and analysis verification are carried out, including: S51. Establish a finite element calculation model. The finite element model adopts the overall structure model, and the boundary conditions are consistent with the actual structure. During the installation and lifting process of the cable net, there is only the self-weight of the structure, and the weight of the cable clamp nodes is considered. The self-weight coefficient is 1.1; S52. Carry out the simulation analysis of the whole construction process to obtain the 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 cables, the internal force of the radial cables, and the internal force of the ring cables. The configuration data and the cable internal forces obtained from the construction simulation are compared with the design displacement and cable internal forces, and the deviation of the construction displacement and cable internal forces is controlled within ±10%.

[0012] In a preferred embodiment, in step 3, the simulation analysis of the whole construction process is carried out, including the following steps: S521. The construction of the steel truss is completed, and the maximum displacement of the steel truss is calculated; S522. The radial cables are connected to the lifting tooling frame and lifted by 2.1 m, and the maximum displacement and maximum stress of the steel truss are calculated; S523. The first ring cable is connected, and it is lifted by 2.1 m continuously, and the maximum displacement and maximum stress of the steel truss are calculated; S524. The second ring cable is connected, and it is lifted by 2.1 m continuously, and the maximum displacement and maximum stress of the steel truss are calculated; S525. The third ring cable is connected, and it is lifted by 2.1 m continuously, and the maximum displacement and maximum stress of the steel truss are calculated; S526. Repeat the above steps until the installation of the ninth ring cable is completed, and the maximum displacement of the steel truss and the maximum stress of the lifting tooling frame are calculated; S527. Continue to lift to 26 m, the tenth ring cable is installed, and the maximum displacement of the steel truss and the maximum stress of the lifting tooling frame are calculated; S528, radial cables are installed in place, the first level 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; 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 level, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S531. Tension the third group of radial cables at the second level 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 at the second level, 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 level, 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 level, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss; S536. Tension the eighth 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; S537, tension the ninth 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; S538. The third level of tensioning is completed, the ring cable tension is fine-tuned, the cable net is formed, and the maximum vertical displacement and maximum stress of the steel truss are calculated. In a preferred embodiment, in step S52, a simulation analysis of the entire construction process is performed, which also includes: in steps S522 to S527, the lifting force value of each lifting point of each step is calculated respectively; in steps S529 to S538, the maximum value of the radial cable internal force of each step is calculated respectively; in steps S528 to S538, the maximum value of the circular cable internal force of each step is calculated respectively.

[0013] In a preferred embodiment, in step S6, the cable net is lifted and tensioned based on the simulation calculation and analysis results, 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 the membrane material after the cable net is formed, so that the membrane material is arranged to fit the cable net 2 to form a curved cylindrical membrane structure, and controlling the surface accuracy by adjusting the cable net tension.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, by setting lifting points and a lifting tooling rack, the cable net is lifted to the designed height in stages, the circumferential cables are installed synchronously, and the radial cables are symmetrically tensioned in three levels and in batches. Combining with the simulation analysis of the whole construction process, the magnitude of the lifting force at each tensioning step, the deformation of the structure at each tensioning step can be obtained, and the configuration data and the internal force of the cables in the construction simulation are compared with the designed displacement and the internal force of the cables, so that the construction displacement and the deviation of the internal force of the cables are both controlled within ±10%. Description of the Drawings

[0015] Figure 1 is the flow chart of the construction method of the present invention; Figure 2 is the schematic structural diagram of the curved cylindrical cable-membrane composite structure system of the present invention; Figure 3 is the schematic structural diagram of the steel truss of the present invention; Figure 4 is the schematic structural diagram of the cable net of the present invention; Figure 5 is the schematic diagram of the setting of the lifting tooling rack of the present invention; Figure 6 is the schematic diagram of the installation of the first circumferential cable of the present invention; Figure 7 is the overall schematic diagram of the docking and installation of the radial cables on the steel truss structure of the present invention; Figure 8 is the schematic diagram of the layout of the lifting points of the present invention; Figure 9 is the schematic diagram of the completion of the tensioning of the radial cables divided into nine groups at each level of the present invention; Figure 10 is the schematic diagram of the finite element calculation model of the present invention; Figure 11 is the simulation result of the displacement during the lifting process after the radial cables and the lifting tooling rack of the present invention are connected and lifted by 2.1 m; Figure 12 is the simulation result of the displacement during the lifting process after the installation of the 10th circumferential cable of the present invention is completed; Figure 13 is the simulation result of the displacement during the tensioning process after the radial cables of the present invention are installed in place and the first-stage pre-tightening is carried out; Figure 14 is the simulation result of the displacement during the tensioning process after the tensioning of the first group of radial cables in the second stage of the present invention; Figure 15 is the simulation result of the displacement during the tensioning process after the tensioning of the ninth group of radial cables in the second stage of the present invention; Figure 16 is the simulation result of the displacement during the tensioning process after the completion of the third-stage tensioning and the formation of the cable net of the present invention; Figure 17The radial cables of the present invention are installed in place, and the simulation results of the stress of the steel truss structure after the first level of pre-tightening are performed; Figure 18 The simulation result of the stress of the steel truss structure after the second-stage first group of radial cables are tensioned according to the present invention; Figure 19 The simulation result of the stress of the steel truss structure after the second-level ninth group of radial cables are tensioned according to the present invention; Figure 20 The simulation result of the stress of the steel truss structure after the third-stage tensioning of the present invention is completed and the cable net is formed; Figure 21 The simulation result of the internal force of the lifting cable after the 10th ring cable of the present invention is installed; Figure 22 The simulation result of the radial cable internal force after the third stage tensioning of the present invention is completed and the cable net is formed; Figure 23 The third stage tensioning of the present invention is completed and the simulation result of the internal force of the hoop cable is obtained after the cable net is formed. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely below. The embodiments of the present invention and all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0017] like Figures 1 to 23 As shown, a construction method of a curved cylindrical cable-membrane composite structure system of a preferred embodiment of the present invention is provided. The cable-membrane composite structure system is a curved cylindrical structure with a concave middle portion. The upper circle of the cylinder is a steel truss structure 1. The steel truss structure 1 includes a plurality of single-piece main trusses 11 evenly spaced in a ring shape. The plurality of single-piece main trusses 11 are connected by inner ring trusses 12 and struts 13. The lower cylinder is a cable net structure. The lower portion of the cable net 2 is fixed on a circular concrete foundation. The upper portion of the cable net 2 is connected to the steel truss structure 1. The cable net 2 includes a plurality of radial cables 21 and ring cables 22. The radial cables 21 and the ring cables 22 are cross-arranged to form a grid. The membrane material is arranged in contact with the cable net 2 to form a curved cylindrical membrane structure. The steel truss structure 1 includes 24 monolithic main trusses 11, the inner ends of the 24 monolithic 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 evenly spaced 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 an integral force-bearing 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. The upper chord and the lower chord of the monolithic main truss 11 are both arc-shaped, the inner ends of the upper chord and the lower chord intersect at a point on the inner side of the steel truss structure, the outer ends of the upper chord and the lower chord are vertically spaced on the outer side of the steel truss structure, and a plurality of oblique support rods are arranged between the upper chord and the lower chord.

[0018] The construction method of the curved cylindrical cable-membrane composite structure system of the present invention comprises the following steps: Step S1, installing the steel truss structure 1 and forming an initial frame; Step S2: Arrange the operating platform and the lifting tool frame, and set the lifting point 14 on the steel truss structure 1.

[0019] Specifically, in step S2, an operating platform and a lifting fixture 3 are arranged, and lifting points are set on the steel truss structure 1, including: S21, an operating platform is set on the steel truss structure 1, a hydraulic synchronous lifting system equipment is installed, 8 lifting points 14 are symmetrically set on the inner ring truss 12, a lifting fixture 3 is set at the projection position of the 8 lifting points 14 below the steel truss structure 1, and 8 lower lifting points are set accordingly, wherein the lifting fixture 3 is set as a ring beam; S22, the lifting fixture 3 is connected to the lifting point 14 through 8 steel strands 31, and the 8 lifting points 14 respectively correspond to the positions of the 2 outer monolithic main trusses 11 among the 4 monolithic main trusses 11; S23, 72 radial cables 21 are radially spread out on the ground.

[0020] Step S3, the radial cable 21 is connected to the lifting fixture frame 3, and is lifted off the ground.

[0021] Step S4, determine the cable net lifting and tensioning scheme: lift the cable net to the designed height in stages, install the ring cables 22 simultaneously, and tension the radial cables 21 symmetrically in stages and batches.

[0022] In step S4, the cable net is lifted to the designed height in stages, and the ring rope 22 is installed synchronously, including: S41, lifting the radial rope 21 off the ground to the first height, and installing the first ring rope 22; S42, continuing to lift the cable net to the second height by lifting the tooling frame 3, and installing the second ring rope 22; S43, continuing to lift the cable net to the third height by lifting the tooling frame 3, and installing the third ring rope; S44, continuing to lift the cable net to the ninth height until the ninth ring rope is installed; S45, continuing to lift the cable net to the tenth height, and installing the tenth ring rope; S46, continuing to lift to the position of the inner ring truss 12, and docking and installing the radial rope on the steel truss structure to form a whole; S47, after the docking and installation are completed, each lifting point of the hydraulic lifting system is synchronously and graded and slowly unloaded; S48, removing the hydraulic lifting equipment, and the overall lifting and installation of the cable net is completed; wherein, the first height to the ninth height are all the same height, and the tenth height is greater than the ninth height.

[0023] In step S4, the radial cables 21 are symmetrically tensioned in batches and grades, including: tensioning the cables at the lower end of the radial cables 21, and the radial cables 21 are tensioned in groups and grades. The tensioning is divided into three levels. In the first level, the cables are pre-tightened. In the second level, the tension is increased to 80% of the design force value. In the third level, the tension is increased to 100% of the design force value. Each level of tensioning is divided into nine groups, with 8 radial cables in each group. The sequence of tensioning for each level is as follows: In the first group, 8 radial cables arranged in a cross-shaped symmetry are tensioned first. The 2 radial cables in each direction of the cross are adjacent to each other. In the second group, 2 radial cables adjacent to the outside of the 2 already tensioned radial cables in each direction are respectively tensioned. In the third group, 2 radial cables adjacent to the outside of the 4 already tensioned radial cables are respectively tensioned, and so on, until the 8 radial cables in the ninth group are tensioned.

[0024] In step S5, simulation calculation and analysis are carried out simultaneously.

[0025] In step S5, simulation calculation and analysis verification are carried out, including: S51. Establish a finite element calculation model 501. The finite element model adopts the overall structure model, and the boundary conditions are consistent with the actual structure. During the installation and lifting of the cable net, there is only the self-weight of the structure, and the weight of the cable clamp nodes is considered. The self-weight coefficient is 1.1.

[0026] Specifically, the establishment of the Midas model includes: In step S511, the scope of structural modeling: Geometric model: Use CAD to establish a line model, covering the steel structure ring beam (elevation 27.3m, diameter 59.88m) and the cable net cylinder (anchored at the circular foundation with an elevation of -5.9m at the lower part and connected to the elevation of 22.2m at the upper part).

[0027] Element type: Steel truss structure: Use beam elements to simulate the main truss and the inner ring truss; Cable net: Use tension-only elements to simulate the radial cables and the ring cables. Tension-only elements can be used for nonlinear analysis; Boundary conditions: The cables and the steel truss structure are hinged.

[0028] In step S512, material parameters: Steel truss structure: Q355B steel, elastic modulus E = 2.06×10 5 MPa; Overall lifting tooling 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.

[0029] In step S513, boundary condition setting: 1. Temporary support Lifting stage: Twelve temporary supports are set on the steel truss (at an elevation of 22.2 m). The overall lifting tooling frame and lifting steel strands are simulated using Midas. The length of the steel strands is simulated by heating and cooling to achieve the lifting effect. Tensioning stage: After removing the temporary supports, only the anchorage constraints of the foundation and cable net are retained.

[0030] 2. Load application Dead load: Self-weight of the steel structure (including the weight of the cable clips), self-weight of the cable net (calculated by a factor of 1.1).

[0031] 3. Establishment of construction steps The steel structure and cables are grouped, and the units of each construction step are activated separately. Step S52: Conduct a full-process simulation analysis of the construction to obtain the simulation analysis results, including 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 cables, the internal force of the radial cables, and the internal force of the ring cables. Compare the configuration data and cable internal forces from the construction simulation with the designed displacement and cable internal forces, and control the deviation of the construction displacement and cable internal forces within ±10%.

[0032] Specifically, in step S52, a full-process simulation analysis of the construction is carried out, including the following steps: S521. The steel truss construction is completed, and the maximum displacement of the steel truss is calculated; S522. The radial cables and the lifting tooling frame are connected and lifted by 2.1 m, and the maximum displacement and maximum stress of the steel truss are calculated; S523. The first ring cable is connected and lifted by another 2.1 m, and the maximum displacement and maximum stress of the steel truss are calculated; S524. The second ring cable is connected and lifted by another 2.1 m, and the maximum displacement and maximum stress of the steel truss are calculated; S525. The third ring cable is connected and lifted by another 2.1 m, and the maximum displacement and maximum stress of the steel truss are calculated; S526. The above steps are repeated until the installation of the ninth ring cable is completed, and the maximum displacement of the steel truss and the maximum stress of the lifting tooling frame are calculated; S527. Continue to lift to 26 m, the tenth ring cable is installed, and the maximum displacement of the steel truss and the maximum stress of the lifting tooling frame are calculated; S528. The radial cables are installed in place, the first-stage pre-tightening of the radial cables is carried out, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S529. The first group of the second-stage radial cables is tensioned, and the maximum vertical displacement of the cable net, the maximum stress of the steel truss and the maximum stress of the steel truss are calculated; S530. The second group of the second-stage 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 third group of the second-stage 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 fourth group of the second-stage 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 fifth group of the second-stage 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 sixth group of the second-stage 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 seventh group of the second-stage 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 eighth group of the second-stage 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 ninth group of the second-stage radial cables is tensioned, and the maximum vertical displacement of the cable net and the maximum stress of the steel truss are calculated; S538. After the third-stage tensioning is completed, the cable force of the ring cables is finely adjusted, 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 full-process simulation analysis of the construction also includes: in steps S522 to S527, the lifting force values of each lifting point in each step are calculated respectively; in steps S529 to S538, the maximum internal force values of the radial cables in each step are calculated respectively; in steps S528 to S538, the maximum internal force values of the ring cables in each step are calculated respectively.

[0033] S53. Cable net forming verification Final state inspection: The vertical displacement of the steel truss ≤ L / 600 (L = diameter 59.88 m → displacement limit ≈ 100 mm); The cable force deviation ≤ 1%, and the internal force of the ring cables is evenly distributed (the ratio of the maximum value to the minimum value ≤ 1.1).

[0034] S54. Simulation calculation and analysis results Through simulation calculation and analysis, 8 lifting points are set for the cable net, the maximum lifting force value at each point is 41 kN, and the safety factor of the lifting steel strand is 6.3; during the lifting process, the maximum stress of the steel truss is 20 MPa, and the maximum stress of the lifting frame ring beam is -77 Mpa; both meet the bearing capacity requirements, and the lifting plan is feasible. During the lifting process of the cable net, the maximum vertical displacement of the lifting point of the steel truss is -3 mm, and the maximum vertical displacement of the steel truss after tensioning is -23 mm, and the deformation meets the requirements. After the cable net is lifted in place, the maximum compressive stress of the steel truss is -15 MPa, and the maximum tensile stress is 18 MPa. After the cable tensioning is completed, the maximum compressive stress of the steel truss is -135 MPa, and the maximum tensile stress is 192 MPa, and the bearing capacity meets the requirements. The radial cable tensioning is carried out in three levels. In the first level, the cable is pre-tightened; in the second level, the maximum tension value of the radial cable is 160 kN, and the maximum tension value of the ring cable is 403 kN; in the third level, the maximum tension value of the radial cable is 209 kN, and the maximum internal force value of the ring cable after the radial cable tensioning is completed is 520 kN. After the cable net is formed, the deviation between the internal force value of the cable and the designed force value is within 1%, meeting the specification requirements, and the plan is feasible.

[0035] Step S6. Based on the simulation calculation and analysis results, carry out the lifting and tensioning of the cable net, and finally complete the formation of the cable net.

[0036] Specifically, in step S6, based on the simulation calculation and analysis results, carry out the lifting and tensioning of the cable net, including: based on the simulation calculation and analysis results, verify the feasibility of the lifting and tensioning plan, select the tensioning tool, determine the tensioning sequence, and lay the membrane material after the cable net is formed, so that the membrane material is arranged in accordance with the cable net 2 to form a curved cylindrical membrane structure, and control the surface accuracy by adjusting the cable net tension.

[0037] The comparison between the simulation calculation and analysis results and the actual construction is shown in the following table: Parameter Simulated value (mm) Measured value (mm) Deviation rate Maximum displacement of steel truss -23 -25 8.7% Cable force of radial cable 209 kN 206 kN 1.25% Internal force of ring cable 520 kN 515 kN 0.96% 1. Result analysis: Displacement control: The deviation between the simulated -23 mm and the measured -25 mm is within a reasonable range, proving the reliability of the model; Cable force uniformity: The internal force deviation of the radial cable and the ring cable is ≤1%, meeting the design requirements; Stress safety reserve: The maximum stress of the steel truss structure is 192 MPa 2. Model verification and optimization: Parameter optimization: Lifting tooling frame: Use H200*200*8 / 12 as the upper lifting ring, which can lift 72 radial cables synchronously, ensuring the symmetry of the construction process; Tensioning sequence adjustment: Advance the tensioning of the 5th group of radial cables to the 3rd group to avoid local stress concentration.

[0038] Conclusion: By establishing a refined finite element model and simulating 18 construction processes, the following technical objectives are achieved: Construction feasibility: Prove the safety of the lifting force of 41 kN and the three-stage tensioning process; Precision control: Guide the on-site construction error. All cables are lifted synchronously using lifting rings, and the installation precision is controlled within ±5 mm.

[0039] Step S7: Install the membrane structure and adjust the cable net tension.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention 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 a plurality of single-piece main trusses (11) arranged in a ring shape and evenly spaced. The plurality of single-piece main trusses (11) are connected by inner ring trusses (12) and struts (13). The lower 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 a plurality of radial cables (21) and ring cables (22). The radial cables (21) and the ring cables (22) are cross-arranged to form a grid. The membrane material is arranged in contact with the cable net (2) to form a curved cylindrical membrane structure. The construction method comprises the following steps: S1, installing the steel truss structure (1) and forming the initial frame; S2, arranging an operating platform and a lifting tool frame, and setting a lifting point (14) on the steel truss structure (1); S3, connecting the radial cable (21) and the lifting fixture frame (3), and lifting it off the ground; S4, determine the cable net lifting and tensioning plan: lift the cable net to the designed height in stages, install the ring cables (22) simultaneously, and tension the radial cables (21) symmetrically in stages and batches; S5, perform simulation calculation and analysis simultaneously; 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.

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) comprises 24 single-piece main trusses (11), the inner ends of the 24 single-piece main trusses (11) are connected via an inner ring truss (12), the cable net (2) comprises 72 radial cables (21) and 10 ring cables (22), the radial cables (21) are arranged in a circular ring shape at even intervals, the intersections of the radial cables (21) and the ring cables (22) are connected via circular cable clamps to form an integral force-bearing 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).

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

4. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 3, characterized in that: In step S4, the cable net is lifted to the designed height in stages while the ring cables (22) are installed synchronously, including: S41. Lifting the radial cables (21) off the ground by a first height and installing the first ring cable (22); S42. Continuing to lift the cable net by a second height through the lifting tooling frame (3) and installing the second ring cable (22); S43. Continuing to lift the cable net by a third height through the lifting tooling frame (3) and installing the third ring cable; S44. Continuing to lift the cable net by a ninth height until the ninth ring cable is installed; S45. Continuing to lift the cable net by a tenth height and installing the tenth ring cable; S46. Continuing to lift to the position of the inner ring truss (12), docking and installing the radial cables on the steel truss structure to form an integral body; S47. After the docking and installation are completed, the hydraulic lifting system slowly unloads in a synchronous and graded manner at each lifting point; S48. Removing the hydraulic lifting equipment, and the overall lifting and installation of the cable net is completed; wherein, the first height to the ninth height are all of the same height, and the tenth height is greater than the ninth height.

5. 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 batches and stages, including: Tensioning the cables at the lower ends of the radial cables (21), the radial cables (21) are tensioned in groups and stages, the tensioning is divided into 3 levels. The first level is for pre-tightening the cables, the second level is tensioned to 80% of the designed force value, and the third level is tensioned to 100% of the designed force value. Each level of tensioning is divided into nine groups, with 8 radial cables in each group. The tensioning sequence for each level is: The first group first tensions 8 radial cables arranged in a cross-shaped symmetry. The 2 radial cables in each direction of the cross are adjacent. The second group respectively tensions 2 radial cables adjacent to the outside of the 2 already tensioned radial cables in each direction. The third group respectively tensions 2 radial cables adjacent to the outside of the 4 already tensioned radial cables. And so on until the 8 radial cables in the ninth group are tensioned.

6. 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 carried out, including: S51. Establishing a finite element calculation model. The finite element model adopts the overall structure model, and the boundary conditions are consistent with the actual structure. During the installation and lifting process of the cable net, there is only the self-weight of the structure, and the weight of the cable clamp nodes is considered. The self-weight coefficient is 1.1; S52. Conducting a full-process simulation analysis of the construction, obtaining the 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 cables, the internal force of the radial cables, and the internal force of the ring cables. And comparing the configuration data and the cable internal forces of the construction simulation with the designed displacement and cable internal forces, and controlling the deviation of the construction displacement and cable internal forces within ±10%.

7. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 6, characterized in that: In step S52, the full-process simulation analysis of the construction is carried out, including the following steps: S521. The construction of the steel truss is completed, and the maximum displacement of the steel truss is calculated; S522. The radial cables are connected to the lifting tooling frame and lifted by 2.1 m, and the maximum displacement and maximum stress of the steel truss are calculated; S523. Connect the first ring cable and continue to lift by 2.1 m, and calculate the maximum displacement and maximum stress of the steel truss; S524. Connect the second ring cable and continue to lift by 2.1 m, and calculate the maximum displacement and maximum stress of the steel truss; S525. Connect the third ring cable, continue to lift by 2.1 m, and calculate the maximum displacement and maximum stress of the steel truss. S526. Repeat the above steps until the installation of the ninth ring cable is completed, and calculate the maximum displacement of the steel truss and the maximum stress of the lifting tooling frame. S527. Continue to lift to 26 m, complete the installation of the tenth ring cable, and calculate the maximum displacement of the steel truss and the maximum stress of the lifting tooling frame. S528. Install the radial cables in place, conduct the first-stage 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 in the second stage, and calculate the maximum vertical displacement of the cable net, the maximum stress of the steel truss, and the maximum stress of the steel truss. S530. Tension the second group of radial cables in the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss. S531. Tension the third group of radial cables in the second stage, 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 in 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 in 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 in the second stage, 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 in the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss. S536. Tension the eighth group of radial cables in the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss. S537. Tension the ninth group of radial cables in the second stage, and calculate the maximum vertical displacement of the cable net and the maximum stress of the steel truss. S538. Complete the third-stage tensioning, fine-tune the cable forces of the ring cables, form the cable net, and calculate the maximum vertical displacement of the steel truss and the maximum stress of the steel truss.

8. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 7, characterized in that: In step S52, for the construction whole-process simulation analysis, it also includes: in steps S522 to S527, calculate the lifting force values of each lifting point in each step respectively; in steps S529 to S538, calculate the maximum internal force values of the radial cables in each step respectively; in steps S528 to S538, calculate the maximum internal force values of the ring cables in each step respectively.

9. The construction method of the curved cylindrical cable-membrane composite structure system according to claim 8, characterized in that: In step S6, based on the simulation calculation and analysis results, conduct the lifting and tensioning of the cable net, including: based on the simulation calculation and analysis results, verify the feasibility of the lifting and tensioning scheme, select the tensioning tools, determine the tensioning sequence, and after the cable net is formed, lay the membrane material to make the membrane material fit the cable net (2) setting, form a curved cylindrical membrane structure, and control the surface accuracy by adjusting the cable net tension.

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