Tensioning construction method for inner ring cable of large-span cable-supported space structure and cable-supported space structure

Abstract

The invention relates to an inner ring cable tensioning construction method for a large-span cable-supported space structure and the cable-supported space structure, and the inner ring cable tensioning construction method comprises the steps: building an overall structure calculation model of the cable-supported space structure based on the cable-supported space structure, and carrying out the simulation calculation of each tensioning stage; a cable-supported space structure is built on a construction site, the inner ring cable is blanked according to a simulation calculation result, and an upper inhaul cable and the inner ring cable are fastened to the end of the cantilever truss so that the inner ring cable can be preliminarily tensioned; and after the tensioning force of the inner ring cable reaches the requirement of partial design pretension, the inner ring cable is completely tensioned by jacking and tensioning the cable-membrane structure and controlling the actual position of each key node of the cable-membrane structure. According to the technical scheme, the tensioning process of the inner ring cable can be accurately controlled, and the stability of the cable-supported space structure is improved.

Description

Technical Field

[0001] The present application relates to the technical field of building space structures, and in particular to a method for tensioning inner ring cables in a large-span cable-supported space structure and a cable-supported space structure. Background Art

[0002] The uplift wind load condition is usually the controlling condition of the large-span cable-supported space structure. In the design, the inner ring cable is usually tensioned to make each cantilever truss subject to vertical downward tension, and form a balanced force system with the upper cable force to resist the load. Since the inner ring cable has been tensioned after the cable-supported canopy is installed, the uplift wind load will not cause a large upward displacement at the end of the cantilever truss, but will cause a large reverse bending moment at the root of the cantilever truss. The upward tension on each cantilever truss under the action of the uplift wind load is converted into annular tension through the inner ring cable, and converges at the end points of the diagonal braces at the four corners of the supporting inner annular space, and finally transmitted to the corner tube supporting the diagonal brace. Therefore, it is very critical whether the tension of the inner ring cable can meet the design requirements when installing the cable-supported canopy, which will directly affect the structural stability and safety of the entire canopy under wind load.

[0003] In the large-span cable-supported space structure, the design pre-tension of the inner ring cable is generally above 2000kN. How to achieve this tension at high altitude is a difficult problem. At the same time, the design requires that the tension of the inner ring cable cannot produce circumferential tension on the end of the cantilever truss. This is because this circumferential tension will produce a huge additional torque on the root of the cantilever truss, causing the root weld to bear excessive stress during installation, affecting the safety of the overall cable-supported structure. Therefore, the tensioning of the inner ring cable cannot rely on conventional tensioning machinery and tensioning methods, and a reasonable and feasible method must be adopted. Summary of the invention

[0004] Based on the above description, the present application provides a construction method for tensioning the inner ring cables of a large-span cable-supported space structure and a cable-supported space structure to solve the problem of how to effectively tension the inner ring cables at high altitudes to improve the stability of the cable-supported space structure.

[0005] In a first aspect, the present application provides a method for tensioning inner ring cables of a large-span cable-supported space structure, wherein the cable-supported space structure comprises a plurality of columns, an upper ring beam, a lower ring beam, a plurality of angle tubes, an inner ring cable and a series of cable-membrane units, wherein the cable-membrane unit comprises an upper cable, a cantilever truss and a cable-membrane structure; the upper ring beam is arranged on the top of the plurality of columns, a horizontal support structure is installed on the outer side of the plurality of columns to connect the lower ring beam, the plurality of angle tubes are arranged between the upper ring beam and the lower ring beam along the circumferential interval, and the angle tubes are connected to the inner ring cable by arranging an outwardly extending diagonal brace; the upper cable is connected between the inner ring cable and the upper ring beam, and the inner ring cable is connected to the upper cable and the end of the cantilever truss by a cable clamp, and the root of the cantilever truss is connected to the column; the cable-membrane structure is jacked and arranged at the end of the column, and connects the inner ring cable, the upper ring beam and the lower ring beam; The inner ring cable tensioning construction method comprises: Based on the cable-supported space structure, an overall structural calculation model of the cable-supported space structure is established and simulation calculations of each tensioning stage are performed; The cable-supported space structure is built at the construction site, and the inner ring cable is cut according to the simulation calculation results, and the upper cable and the inner ring cable are fastened at the end of the cantilever truss to preliminarily tension the inner ring cable; After the tensioning force of the inner ring cable reaches the requirement of partial design pretension, the inner ring cable is fully tensioned by jacking and tensioning the cable-membrane structure and controlling the actual positions of key nodes of the cable-membrane structure.

[0006] In one or more embodiments, the cable-membrane structure includes a membrane surface, ridge cables, valley cables and side cables, and the ridge cables, valley cables and side cables are used to form the membrane surface; based on the cable-supported space structure, an overall structural calculation model of the cable-supported space structure is established and simulation calculations of each tensioning stage are performed, including: The overall structural calculation model of the cable-supported space structure is established by using finite element analysis software, and the reserved installation distance and bolt preload between the cable clamp and the end of the cantilever truss and the theoretical cutting length of the inner ring cable are simulated and calculated to achieve the application of the partial designed preload force to the inner ring cable; After the tensioning force of the inner ring cable reaches the partial design pretensioning force, simulation is used to determine whether the tensioning force of the valley cable and the tensioning force of the membrane surface have reached their respective preset tensions, so as to determine whether the tensioning force of the inner ring cable has reached the full design pretensioning force.

[0007] In one or more embodiments, the partial design pre-tension is 20%-30% of the total design pre-tension.

[0008] In one or more embodiments, the inner ring cable is cut according to the simulation calculation results, and the upper cable and the inner ring cable are fastened at the end of the cantilever truss to perform preliminary tensioning on the inner ring cable, including: Cut the inner ring rope according to the theoretical cutting length, and divide the inner ring rope into n sections for hoisting, where the value of n is the same as the number of corner tubes; Position the end of the outwardly extending diagonal brace of the angle tube at the installation point, and connect the end of each section of the inner ring cable to the end of the outwardly extending diagonal brace of the angle tube to complete the overall installation of the inner ring cable; Install the upper cables in sequence from the middle of the inner ring cable of each section to the end of the outwardly extending diagonal support of the corner tube; An installation space is reserved between the cable clamp and the end of the cantilever truss, and each cantilever truss uses the installation space to install a high-strength bolt for connecting the cable clamp; The high-strength bolts are subjected to a pre-tightening force symmetrically, evenly and repeatedly from the middle of each section of the inner ring cable to both sides, so that the inner ring cable generates an annular tension.

[0009] In one or more embodiments, the cable-membrane structure includes a membrane surface, a ridge cable, a valley cable and a side cable, the ridge cable is connected to the membrane surface through a floating ring, the ridge cable is connected between the floating ring and the inner ring cable; the valley cable is connected between the inner ring cable and the lower ring beam to press the membrane surface; an upper pull rod is connected between the upper ring beam and the lower ring beam so that a part of the side cable is tensioned and connected between the floating ring and the lower ring beam; a lower pull rod is connected to the lower ring beam in intervals so that another part of the side cable is intervals and tensioned and connected to the lower ring beam.

[0010] In one or more embodiments, the inner ring cable is fully tensioned by lifting and tensioning the cable-membrane structure and controlling the actual positions of key nodes of the cable-membrane structure, including: The floating ring is lifted by a lifting tool, the membrane surface is lifted and the valley cables, ridge cables and side cables are tensioned, so that the ring cables in each section are tensioned symmetrically, evenly and repeatedly from the middle to both sides as a whole, and the actual positions of the key nodes of the valley cables and the membrane surface are adjusted according to the theoretical positions of the key nodes of the valley cables and the membrane surface.

[0011] In one or more embodiments, it also includes: monitoring the stress and strain of rods and cables at key locations during the construction lifting and tensioning process.

[0012] In one or more embodiments, the span of the cable-supported space structure is not less than 60 m, and the length of the cantilever truss is not less than 10 m.

[0013] In the second aspect, the present application provides a large-span cable-supported space structure, comprising a plurality of columns, an upper ring beam, a lower ring beam, a plurality of angle tubes, an inner ring cable and a series of cable-membrane units, wherein the cable-membrane unit comprises an upper cable, a cantilever truss and a cable-membrane structure; the upper ring beam is arranged on the top of the plurality of columns, a horizontal support structure is installed on the outer side of the plurality of columns to connect the lower ring beam, the plurality of angle tubes are arranged at intervals along the circumferential direction between the upper ring beam and the lower ring beam, and the angle tubes are connected to the inner ring cable by arranging an outwardly extending diagonal brace; the upper cable is connected between the inner ring cable and the upper ring beam, and the inner ring cable is connected to the upper cable and the end of the cantilever truss by a cable clamp, and the root of the cantilever truss is connected to the column; the cable-membrane structure is jacked and arranged at the end of the column, and connects the inner ring cable, the upper ring beam and the lower ring beam.

[0014] In one or more embodiments, the cable-supported space structure is an integral tensioned structure.

[0015] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects: simulation calculations of each tensioning stage are performed through the overall structural calculation model of the cable-supported space structure to provide parameter references for the tensioning process of the inner ring cable during the construction stage; the tensioning process of the inner ring cable is divided into two stages: the first stage of tensioning is completed by installing the upper cable and the inner ring cable at the end of the cantilever truss; the second stage of tensioning is completed by installing the cable membrane structure after the tensioning force in the first stage reaches the design requirements. In this way, the problems caused by the traditional tensioning process, such as the difficulty in construction of high-altitude tensioning machinery, damage to the constructed part due to excessive tensioning force, difficulty in coordinating tensioning force and deformation, and difficulty in accurately tensioning the tensioning force according to the design requirements, can be reduced, thereby achieving precise control of the tensioning process of the inner ring cable and improving the stability of the cable-supported space structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a cable-supported space structure provided in an embodiment of the present application; Figure 2 for Figure 1 Schematic diagram of part of the structure of the cable membrane unit; Figure 3 for Figure 1 Top view of the cable-supported space structure; Figure 4 A flow chart of a method for tensioning inner ring cables in a large-span cable-supported space structure provided in an embodiment of the present application.

[0017] Description of reference numerals: Cable-supported space structure 100; Column 10; Upper ring beam 20; Lower ring beam 30; Corner tube 40; Internal ring cable 50; Cable-membrane unit 60, upper cable 61, cantilever truss 62, membrane surface 63, ridge cable 64, valley cable 65, side cable 66; Horizontal support structure 70; Upper pull rod 80; Lower pull rod 90; First span r1, first length h1. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0020] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0021] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, units, units, etc. have electrical signals or data transmission between each other.

[0022] Figure 1 A schematic diagram of a cable-supported space structure provided by an embodiment of the present application is shown. Figure 2 Shows Figure 1 Schematic diagram of the partial structure of the cable membrane unit. Figure 3 Shows Figure 1 The top view of the central cable bearing space structure only shows the part related to the present embodiment for the convenience of explanation.

[0023] See also Figures 1 to 3A large-span cable-supported space structure 100 provided in one embodiment of the present application includes a plurality of columns 10, an upper ring beam 20, a lower ring beam 30, a plurality of angle tubes 40, an inner ring cable 50 and a series of cable-membrane units 60, wherein the cable-membrane unit 60 includes an upper cable 61, a cantilever truss 62 and a cable-membrane structure. The upper ring beam 20 is arranged on the top of the plurality of columns 10, and a horizontal support structure 70 is installed outside the plurality of columns 10 to connect the lower ring beam 30. A plurality of angle tubes 40 are arranged at intervals along the circumferential direction between the upper ring beam 20 and the lower ring beam 30, and the angle tubes 40 are connected to the inner ring cable 50 by setting an outwardly extending diagonal brace. The upper cable 61 is connected between the inner ring cable 50 and the upper ring beam 20, and the inner ring cable 50 is connected to the upper cable 61 and the end of the cantilever truss 62 through a cable clamp, and the root of the cantilever truss 62 is connected to the column 10. The cable-membrane structure is jacked and arranged at the end of the column 10 , and connects the inner ring cable 50 , the upper ring beam 20 and the lower ring beam 30 .

[0024] In this embodiment, the tensioning process of the inner ring cable 50 of the large-span cable-supported space structure 100 is divided into two stages: the first stage tensioning is completed by installing the upper cable 61 and the inner ring cable 50 at the end of the cantilever truss 62; the second stage tensioning is completed by installing the cable membrane structure after the tensioning force in the first stage reaches the design requirements. In this way, many problems caused by the traditional process of tensioning the inner ring cable can be avoided, such as: high-altitude tensioning machinery is difficult to construct, excessive tensioning force is easy to cause damage to the constructed part, tensioning force and deformation are difficult to coordinate, and tensioning force is not easy to be accurately tensioned according to design requirements.

[0025] In some embodiments, the span of the cable-supported space structure 100 is not less than 60m, and the length of the cantilever truss 62 is not less than 10m. In a specific embodiment, for example, a cable-supported space structure of a stadium in an actual project is taken as an example, the cable-supported space structure of the stadium (stadium canopy) is elliptical, with an east-west span of 277m and a north-south span of 245m, and is composed of 64 umbrella-shaped cable-membrane units 60, and an overall spatial force system is formed through columns 10, four corner tubes 40, inner ring cables 50, upper ring beams 20, lower ring beams 30, horizontal support structures 70, upper tie rods 80, and lower tie rods 90.

[0026] In some embodiments, the cable-membrane structure includes a membrane surface 63, a ridge cable 64, a valley cable 65, and an edge cable 66. The ridge cable 64 is connected to the membrane surface 63 through a floating ring, and the ridge cable 64 is connected between the floating ring (not shown in the figure) and the inner ring cable 50. The valley cable 65 is connected between the inner ring cable 50 and the lower ring beam 30, and is used to press the membrane surface 63. An upper pull rod 80 is connected between the upper ring beam 20 and the lower ring beam 30, so that a part of the edge cable 66 is tensioned and connected between the floating ring and the lower ring beam 30. The lower ring beam 30 is connected with a lower pull rod 90 at intervals, so that another part of the edge cable 66 is tensioned and connected to the lower ring beam 30 at intervals. In this way, the membrane surface 63 is tensioned and shaped by the ridge cable 64, the valley cable 65, and the edge cable 66, thereby improving the stability of the canopy.

[0027] In some embodiments, the cable-supported space structure 100 is an integral tensioned structure. In this embodiment, the inner ring cable 50 and the cable membrane structure have good rigidity and toughness. During the design and construction process, a certain tension force can be preset for the inner ring cable 50 and the cable membrane structure, and the tension force can be used to enhance the stability of the cable-supported space structure 100.

[0028] Continue reading Figures 1 to 3 , and combined with Figure 4 , Figure 4 A flow chart of a method for tensioning inner ring cables in a large-span cable-supported space structure provided by an embodiment of the present application is shown. An embodiment of the present application provides a method for tensioning inner ring cables in a large-span cable-supported space structure, wherein the cable-supported space structure 100 has been described in the above embodiment and will not be repeated here.

[0029] The inner ring cable tensioning construction method of the large-span cable-supported space structure of this embodiment comprises the following steps: S10. Based on the cable-supported space structure 100, an overall structural calculation model of the cable-supported space structure 100 is established and simulation calculations of each tensioning stage are performed.

[0030] S20, constructing the cable-supported space structure 100 at the construction site, and cutting the inner ring cable 50 according to the simulation calculation results, and fastening the upper cable 61 and the inner ring cable 50 at the end of the cantilever truss 62 to preliminarily tension the inner ring cable 50.

[0031] S30, after the tensioning force of the inner ring cable 50 reaches the requirement of partial design pretensioning force, the inner ring cable 50 is fully tensioned by jacking up and tensioning the cable membrane structure and controlling the actual positions of key nodes of the cable membrane structure.

[0032] In the present embodiment, the design of the tensioning of the inner ring cable of the cable-supported space structure is divided into two stages. The installation of the upper cable 61 and the inner ring cable 50 at the end of the cantilever truss 62 is simulated in the overall structural calculation model of the cable-supported space structure 100, and the tensioning force of the inner ring cable 50 reaches part of the design pretension by calculating the preset parameters. After the tensioning force of the inner ring cable 50 reaches part of the design pretension, the installation of the cable membrane structure is simulated in the overall structural calculation model of the cable-supported space structure 100, and the tensioning force of the inner ring cable 50 reaches the full design pretension by simulation judgment and control.

[0033] According to the simulation process, the construction process of tensioning the inner ring cable of the cable-supported space structure is also divided into two stages. The structural frame of the cable-supported space structure 100 (for example, columns 10, upper ring beams 20, lower ring beams 30, horizontal support structures 70, and angle tubes 40) is built at the construction site, and then the inner ring cable 50 is cut according to the simulation calculation structure to complete the installation of the entire inner ring cable 50, and the upper cable 61 and the inner ring cable 50 are fastened at the end of the cantilever truss 62 to apply a partial design pre-tension to the inner ring cable 50; then the cable membrane structure is lifted and tensioned by the lifting tool, and the actual positions of the key nodes of the cable membrane structure are controlled according to the simulation calculation results to fully tension the inner ring cable 50 so that the tensioning force of the inner ring cable 50 reaches the full design pre-tension. In this way, many problems caused by the traditional process of tensioning the inner ring cable 50 can be avoided, such as: high-altitude tensioning machinery is difficult to construct, excessive tensioning force is easy to cause damage to the constructed part, tensioning force and deformation are difficult to coordinate, tensioning force is difficult to accurately tension in place according to design requirements, etc., thereby improving the accuracy of tensioning the inner ring cable 50 and the stability of the cable-supported space structure 100.

[0034] In some embodiments, the cable-membrane structure includes a membrane surface 63, a ridge cable 64, a valley cable 65 and an edge cable 66, and the ridge cable 64, the valley cable 65 and the edge cable 66 are used to form the membrane surface 63; step S10 is to establish an overall structural calculation model of the cable-supported space structure 100 based on the cable-supported space structure 100 and perform simulation calculations at each tensioning stage, including: S11. Use finite element analysis software to establish an overall structural calculation model of the cable-supported space structure 100, and simulate and calculate the reserved installation distance and bolt preload between the cable clamp and the end of the cantilever truss 62 and the theoretical cutting length of the inner ring cable 50 to achieve partial design preload on the inner ring cable 50.

[0035] S12. After the tensioning force of the inner ring cable 50 reaches part of the design pretensioning force, simulation is used to determine whether the tensioning force of the valley cable 65 and the tensioning force of the membrane surface 63 have reached their respective preset tensions, so as to determine whether the tensioning force of the inner ring cable 50 has reached the full design pretensioning force.

[0036] In this embodiment, finite element analysis software such as ANSYS or 3D3S can be used. The overall structural calculation model of the cable-supported space structure 100 is established by the finite element analysis software, and the overall structural calculation model includes the inner ring cable 50, the upper cable 61 and the cable membrane unit 60. In this embodiment, the partial design pretension is 20%-30% of the total design pretension, for example, the partial design pretension is 20%, 25% or 30% of the total design pretension. In a specific embodiment, when the tensioning force of the inner ring cable 50 reaches the partial design pretension, the reserved installation distance between the cable clamp and the end of the cantilever truss 62 and the bolt preload force and the theoretical blanking length of the inner ring cable 50 are calculated by simulation calculation, so as to facilitate the guidance of the first stage tensioning operation of the inner ring cable 50, so that the inner ring cable 50 generates about 25% of the total design pretension. Furthermore, since the quantitative control of the tensioning force in the second stage is more difficult than that in the first stage, the theoretical positions of the key nodes of the valley cable 65 and the membrane surface 63 are mainly calculated by simulation, so that when the tensioning force of the valley cable 65 reaches the corresponding preset tension, the tensioning force of the membrane surface 63 also reaches the corresponding preset tension, so as to determine whether the inner ring cable 50 meets the design requirements of the full design pretension. In this way, the preset parameters of the inner ring cable 50 and related structures in the first and second stages are designed step by step, so as to facilitate the guidance of the tensioning process of the inner ring cable 50 during the construction process, so as to accurately control the tensioning effect of the inner ring cable 50 and improve the stability of the cable-supported space structure 100.

[0037] In some embodiments, in step S20, according to the simulation calculation results, the inner ring cable 50 is cut, and the upper cable 61 and the inner ring cable 50 are fastened at the end of the cantilever truss 62 to perform preliminary tensioning on the inner ring cable 50, including: S21. Cut the inner ring rope 50 according to the theoretical cutting length, and divide the inner ring rope 50 into n sections for hoisting, where the value of n is the same as the number of the corner tubes 40.

[0038] S22, the outwardly extending diagonal brace end of the corner tube 40 is positioned at the installation point, and the end of each section of the inner ring cable 50 is connected to the outwardly extending diagonal brace end of the corner tube 40 to complete the overall installation of the inner ring cable 50.

[0039] S23, sequentially install the upper cables 61 from the middle of the inner ring cables 50 of each section toward the end of the outwardly extending diagonal braces of the corner tube 40.

[0040] S24, reserve installation space between the cable clamp and the end of the cantilever truss 62, and each cantilever truss 62 uses the installation space to install high-strength bolts for connecting the cable clamp.

[0041] S25, applying pre-tightening force to the high-strength bolts symmetrically, evenly and repeatedly from the middle of each section of the inner ring cable 50 to both sides, so that the inner ring cable 50 generates annular tension.

[0042] It should be noted that the theoretical cutting length, reserved installation distance and bolt preload obtained by simulation calculation are all theoretical calculation values. In the actual tensioning process, the inner ring cable 50 and related structures are installed and tensioned with reference to these theoretical calculation values.

[0043] In this embodiment, the number of the angle tubes 40 is four. The inner ring cable 50 is cut according to the theoretical cutting length calculated by simulation, and the inner ring cable 50 is divided into four sections for hoisting. Each section of the inner ring cable 50 is connected between the ends of the outwardly extending diagonal braces (not shown in the figure) of two angle tubes 40 to complete the overall installation of the inner ring cable 50. Then, the upper cable 61 is sequentially installed from the middle of each section of the inner ring cable 50 to the end of the outwardly extending diagonal brace of the angle tube 40, that is, the inner ring cable 50 is connected to the upper cable 61 through a cable clamp. In this embodiment, the cable clamp can be freely adjusted and locked on the inner ring cable 50. Further, according to the reserved installation distance calculated by simulation, the end of the cantilever truss 62 is placed at the installation point and the installation space between the cable clamp and the end of the cantilever truss 62 is reserved, and high-strength bolts are installed on the ear plates at the ends of each cantilever truss 62, and the high-strength bolts are used to connect the cable clamps. Furthermore, according to the bolt preload calculated by simulation, the preload is applied to the high-strength bolts symmetrically and evenly from the middle of each section of the inner ring cable 50 to both sides, so that the inner ring cable 50 generates annular tension. In this way, the upper cable 61 and the cantilever truss 62 complete the tensioning effect on the inner ring cable 50, so that the inner ring cable 50 generates annular tension and reaches 20%-30% of the total designed preload, realizing the first stage of precise tension control.

[0044] In some embodiments, in step S30, the cable-membrane structure is lifted and tensioned, and the actual positions of the key nodes of the cable-membrane structure are controlled to fully tension the inner ring cable 50, including: using a lifting tool to lift the floating ring, lift the membrane surface 63 and tension the valley cable 65, the ridge cable 64 and the side cable 66, so as to tension each section of the inner ring cable 50 symmetrically, evenly and repeatedly from the middle to both sides as a whole, and adjust the actual positions of the key nodes of the valley cable 65 and the membrane surface 63 according to the theoretical positions of the key nodes of the valley cable 65 and the membrane surface 63.

[0045] In this embodiment, from the middle of each section of the inner ring cable 50 to both sides, each floating ring is lifted to the corresponding position of the upper ring beam 20 by using a lifting tool, the membrane surface 63 is lifted and the valley cable 65, the ridge cable 64 and the side cable 66 are tensioned, so as to tension the inner ring cable 50 of each section symmetrically, evenly and repeatedly from the middle to both sides. In the tensioning process, the actual positions of the key nodes of the valley cable 65 and the membrane surface 63 are adjusted mainly according to the theoretical positions of the key nodes of the valley cable 65 and the membrane surface 63 calculated by simulation, so as to determine that the tensioning force of the valley cable 65 and the tensioning force of the membrane surface 63 both reach the corresponding preset tension, so as to determine that the inner ring cable 50 reaches the design requirements of all the design pre-tensioning forces, so as to achieve the precise tensioning of the inner ring cable 50 in the second stage mainly by controlling the tensioning of the membrane surface 63 and the valley cable 65, and improve the tensioning effect of the inner ring cable 50 and the cable-membrane structure and the stability of the cable-supported space structure 100.

[0046] In some embodiments, it also includes: monitoring the stress and strain of the key rods and cables during the construction hoisting and tensioning process. In this embodiment, health monitoring is performed on the stress and strain of the key rods and cables during the entire process of construction hoisting, tensioning and even after being put into use, so as to verify whether the large-span cable-supported space structure 100 has achieved the design intent at each stage and whether the tensioning force of the inner ring cable 50 has met the design requirements.

[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for tensioning inner ring cables in a large-span cable-supported space structure, characterized in that: The cable-supported space structure comprises a plurality of columns, an upper ring beam, a lower ring beam, a plurality of angle tubes, an inner ring cable and a series of cable-membrane units, wherein the cable-membrane units comprise an upper cable, a cantilever truss and a cable-membrane structure; the upper ring beam is arranged on the top of the plurality of columns, a horizontal support structure is installed on the outer side of the plurality of columns to connect the lower ring beam, the plurality of angle tubes are arranged at intervals along the circumferential direction between the upper ring beam and the lower ring beam, and the angle tubes are connected to the inner ring cable by arranging an outwardly extending diagonal brace; the upper cable is connected between the inner ring cable and the upper ring beam, and the inner ring cable is connected to the upper cable and the end of the cantilever truss by a cable clamp, and the root of the cantilever truss is connected to the column; the cable-membrane structure is jacked and arranged at the end of the column, and connects the inner ring cable, the upper ring beam and the lower ring beam; The inner ring cable tensioning construction method comprises: Based on the cable-supported space structure, an overall structural calculation model of the cable-supported space structure is established and simulation calculations of each tensioning stage are performed; The cable-supported space structure is built at the construction site, and the inner ring cable is cut according to the simulation calculation results, and the upper cable and the inner ring cable are fastened at the end of the cantilever truss to preliminarily tension the inner ring cable; After the tensioning force of the inner ring cable reaches the requirement of partial design pretension, the inner ring cable is fully tensioned by jacking and tensioning the cable-membrane structure and controlling the actual positions of key nodes of the cable-membrane structure.

2. The method for tensioning inner ring cables of a large-span cable-supported space structure according to claim 1 is characterized in that: The cable membrane structure comprises a membrane surface, a ridge cable, a valley cable and an edge cable, wherein the ridge cable, the valley cable and the edge cable are used to form the membrane surface; Based on the cable-supported space structure, an overall structural calculation model of the cable-supported space structure is established and simulation calculations of each tensioning stage are performed, including: The overall structural calculation model of the cable-supported space structure is established by using finite element analysis software, and the reserved installation distance and bolt preload between the cable clamp and the end of the cantilever truss and the theoretical cutting length of the inner ring cable are simulated and calculated to achieve the application of the partial designed preload force to the inner ring cable; After the tensioning force of the inner ring cable reaches the partial design pretensioning force, simulation is used to determine whether the tensioning force of the valley cable and the tensioning force of the membrane surface have reached their respective preset tensions, so as to determine whether the tensioning force of the inner ring cable has reached the full design pretensioning force.

3. The method for tensioning inner ring cables of a large-span cable-supported space structure according to claim 2 is characterized in that: The partial design pre-tension is 20%-30% of the total design pre-tension.

4. The method for tensioning inner ring cables of a large-span cable-supported space structure according to claim 1, characterized in that: According to the simulation calculation results, the inner ring cable is cut, and the upper cable and the inner ring cable are fastened at the end of the cantilever truss to perform preliminary tensioning on the inner ring cable, including: Cut the inner ring rope according to the theoretical cutting length, and divide the inner ring rope into n sections for hoisting, where the value of n is the same as the number of corner tubes; Position the end of the outwardly extending diagonal brace of the angle tube at the installation point, and connect the end of each section of the inner ring cable to the end of the outwardly extending diagonal brace of the angle tube to complete the overall installation of the inner ring cable; Install the upper cables in sequence from the middle of the inner ring cable of each section to the end of the outwardly extending diagonal support of the corner tube; An installation space is reserved between the cable clamp and the end of the cantilever truss, and each cantilever truss uses the installation space to install a high-strength bolt for connecting the cable clamp; The high-strength bolts are subjected to a pre-tightening force symmetrically, evenly and repeatedly from the middle of each section of the inner ring cable to both sides, so that the inner ring cable generates an annular tension.

5. The method for tensioning inner ring cables of a large-span cable-supported space structure according to claim 1, characterized in that: The cable-membrane structure includes a membrane surface, a ridge cable, a valley cable and an edge cable. The ridge cable is connected to the membrane surface through a floating ring. The ridge cable is connected between the floating ring and the inner ring cable. The valley cable is connected between the inner ring cable and the lower ring beam to press the membrane surface. An upper pull rod is connected between the upper ring beam and the lower ring beam to tension a portion of the edge cable between the floating ring and the lower ring beam. A lower pull rod is connected to the lower ring beam to tension another portion of the edge cable between the floating ring and the lower ring beam.

6. The method for tensioning inner ring cables of a large-span cable-supported space structure according to claim 5, characterized in that: The method of jacking up and tensioning the cable-membrane structure and controlling the actual positions of key nodes of the cable-membrane structure to completely tension the inner ring cable comprises: The floating ring is lifted by a lifting tool, the membrane surface is lifted and the valley cables, ridge cables and side cables are tensioned, so that the ring cables in each section are tensioned symmetrically, evenly and repeatedly from the middle to both sides as a whole, and the actual positions of the key nodes of the valley cables and the membrane surface are adjusted according to the theoretical positions of the key nodes of the valley cables and the membrane surface.

7. The method for tensioning inner ring cables of a large-span cable-supported space structure according to any one of claims 1 to 6, characterized in that: Also includes: Monitor the stress and strain of key rods and cables during construction lifting and tensioning.

8. The method for tensioning inner ring cables of a large-span cable-supported space structure according to any one of claims 1 to 6, characterized in that: The span of the cable-supported spatial structure is not less than 60m, and the length of the cantilever truss is not less than 10m.

9. A large-span cable-supported space structure, characterized in that: It includes a plurality of columns, an upper ring beam, a lower ring beam, a plurality of angle tubes, an inner ring cable and a series of cable-membrane units, wherein the cable-membrane units include an upper cable, a cantilever truss and a cable-membrane structure; the upper ring beam is arranged on the top of the plurality of columns, a horizontal support structure is installed on the outer side of the plurality of columns to connect the lower ring beam, the plurality of angle tubes are arranged at intervals along the circumferential direction between the upper ring beam and the lower ring beam, and the angle tubes are connected to the inner ring cable by arranging an outwardly extending diagonal brace; the upper cable is connected between the inner ring cable and the upper ring beam, and the inner ring cable is connected to the upper cable and the end of the cantilever truss through a cable clamp, and the root of the cantilever truss is connected to the column; the cable-membrane structure is jacked and arranged at the end of the column, and connects the inner ring cable, the upper ring beam and the lower ring beam.

10. The large-span cable-supported space structure according to claim 9, characterized in that: The cable-supported space structure is an integral tensioned structure.

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