A mounting device and method for a beam string inner ring structure

Abstract

The application relates to the technical field of large-span steel structure construction, and provides a mounting device and method for a string beam inner ring structure, which is characterized in that the method is performed through the steps of mounting a supporting device, mounting an upper rigid load-bearing structure, assembling a lower flexible ring cable combination on the ground, lifting the ring cable combination by using a lifting device, connecting a flying column and mounting a cross cable. The lifting device comprises a plurality of lifting units distributed in the circumferential direction of the ring cable, each lifting unit is wrapped around and tightly held around the ring cable in a symmetrical binding mode through a flexible sling, and a stable lifting force system is formed. The mounting difficulty of the upper rigid and lower flexible inner ring structure is solved, and the mounting precision, efficiency and safety are significantly improved.

Description

Technical Field

[0001] This invention belongs to the field of large-span steel structure construction technology, specifically relating to an installation device and method for an inner ring structure of a tensioned beam. Background Technology

[0002] The spoke-wheel tensioned beam structure is widely used in large-span public buildings such as stadiums due to its superior economy and aesthetics. The central inner ring of this structure is a key component connecting the radial beams and radial cables. To meet the structural stress requirements of large-span spaces, the inner ring often adopts a rigid-upper, flexible-lower structure where the upper rigid grid beam and lower flexible ring cable are connected by flying columns. This type of structure faces two core challenges during installation: first, the lower ring cable is a flexible component and lacks load-bearing capacity before installation and tensioning, thus failing to provide support for the high-altitude installation of the upper rigid grid beam; second, the installation of both the upper rigid grid beam and the lower flexible ring cable relies on high-altitude operations, requiring traditional methods to erect numerous full-span scaffolding structures, resulting in high costs, long construction periods, and significant land occupation.

[0003] Among existing construction methods, the full-span scaffolding method requires erecting supports from the ground to the designed positions of the ring cables and grid beams, and then assembling all components on top of them. Although this method has a low technical threshold, it involves high construction costs, a large amount of high-altitude work, and difficulties in deploying and installing large-tonnage cables on the scaffolding. The overall lifting method is another option, which involves assembling the ring cables on the ground and then using the already installed upper rigid structure as a platform to lift them into place. However, this method assumes that the upper rigid structure already exists. If this method is applied to this type of inner ring structure, the first problem that needs to be solved is how to install the upper rigid structure itself without the support of the lower flexible body.

[0004] Therefore, how to provide a systematic construction method that can not only complete the installation of the upper rigid load-bearing structure without lower support, but also transform the upper load-bearing structure into a lifting platform to safely and accurately lift and connect the lower flexible ring cable to it is a technical problem that has not yet been solved by existing technology. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned problems existing in the prior art and provide an installation device and method for the inner ring structure of a tensioned beam.

[0006] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention proposes an installation method for an inner ring structure of a tensioned beam, wherein the inner ring structure of the tensioned beam includes an upper grid beam, flying columns, ring cables, and ring cable clamps, wherein the upper grid beam is a rigid structure, and the ring cables are a flexible structure, and the method includes the following steps: S1: Erect a support device and install a central cast steel component on top of the support device; S2: Assemble multiple upper grid beams and corresponding flying columns on the ground to form a segmented unit, hoist the segmented unit as a whole to the top of the support device, and fix it to the central cast steel part in the air to form an upper rigid load-bearing structure for the subsequent lifting platform; S3: On the ground directly below the upper rigid load-bearing structure, the ring cable and multiple ring cable clamps are assembled as a whole to form a lower flexible ring cable assembly; S4: A lifting device is installed on the upper rigid load-bearing structure to vertically lift the lower flexible ring cable assembly until each ring cable clamp reaches below its corresponding flying column; the lifting device includes multiple lifting units distributed along the circumference of the ring cable, each lifting unit includes a flexible sling, the lower end of the flexible sling is symmetrically tied around and held tightly to the ring cables on both sides of the ring cable clamp to maintain the stability of the lower flexible ring cable assembly during the lifting process; S5: Hinge each ring cable clamp to the lower end of the corresponding flying column to complete the installation of the load-bearing system of the inner ring structure.

[0007] Furthermore, in step S2, the upper grid beam and the flying column are assembled on the ground in a horizontal assembly manner. The two are connected by a hinge, so that the flying column can rotate around the hinge point to a vertical state under the action of gravity during the hoisting process, and the hoisting point is set on the upper grid beam.

[0008] Furthermore, in step S3, the surface of the ring cable is pre-marked with cable clamp points and anti-torsion horizontal indicator lines; during assembly, the ring cable clamps are precisely aligned with the marked points and installed, and the anti-torsion horizontal indicator lines are kept straight and without twisting, so as to ensure that the ring cable clamps correspond to the positions of the installed flying posts.

[0009] Further, in step S4, the lifting unit also includes an upper lifting lug, a lower lifting lug, a steel strand, and a through-hole jack; the upper lifting lug is pre-fixed to the upper rigid load-bearing structure; the upper end of the steel strand passes through the upper lifting lug and is connected to the through-hole jack installed on the upper lifting lug, and the lower end of the steel strand is connected to the lower lifting lug; the through-hole jack is used to drive the steel strand to provide lifting force; the lower end of the lower lifting lug is connected to the flexible sling.

[0010] Furthermore, in step S4, the lifting unit also includes auxiliary tie rods disposed on both sides of each of the lower lifting lugs. The upper ends of the two auxiliary tie rods are connected to the lower lifting lugs, and the lower ends are detachably connected to the two lower auxiliary lug plates on the ring cable clamp. The two auxiliary tie rods are symmetrically arranged on both sides of the flexible sling to form a stable lifting force system that prevents torsion.

[0011] Further, step S5 includes: after the ring cable clamp is in place, firstly, hinge the lower main lug plate on the ring cable clamp to the lower end of the flying column above it, then remove the auxiliary tie rod, then connect the lower ends of the two inclined cables that make up the cross cable to the two lower auxiliary lug plates respectively, and connect the upper ends of the two inclined cables to the upper auxiliary lug plate at the lower end of the upper grid beam adjacent to the corresponding flying column, thereby forming a cross arrangement between adjacent flying columns.

[0012] Furthermore, the upper end of the flying column is hinged to the upper main ear plate on the connector located at the lower end of the upper grid beam.

[0013] Furthermore, the lower main ear plate and the two lower auxiliary ear plates together constitute a first connecting member disposed at the upper end of the ring cable clamp, and the two lower auxiliary ear plates are distributed on both sides of the lower main ear plate; the upper main ear plate and the two upper auxiliary ear plates together constitute a second connecting member disposed at the lower end of the upper grid beam, and the two upper auxiliary ear plates are distributed on both sides of the upper main ear plate.

[0014] Further, in step S1, the support device includes multiple standard sections of the jig and connecting rods connecting the multiple standard sections of the jig. The multiple standard sections of the jig are arranged directly below the hollow area enclosed by the central cast steel part and the upper grid beam, and are connected to each other at their tops by a top load guide beam to form a ring support platform.

[0015] Secondly, the present invention provides an installation device for an inner ring structure of a tensioned beam, the inner ring structure comprising an upper grid beam, flying columns, ring cables, and ring cable clamps; characterized in that the installation device is applied to the above-mentioned installation method, and the installation device comprises: The support system is used to erect and support the pre-installed upper grid beams and flying columns to form a rigid upper load-bearing structure. The lifting system, using the upper rigid load-bearing structure as the load-bearing point, is used to lift the lower flexible ring cable assembly composed of ring cables and ring cable clamps. The lifting system includes multiple lifting units distributed circumferentially along the ring cables, and each lifting unit includes: The lifting lugs are then welded and fixed to the upper grid beam of the upper rigid load-bearing structure. Steel strand and the lifting lugs connecting its lower end; A through-hole jack is installed at the lifting lug and is used to drive the steel strand to provide lifting force; The flexible sling is connected at its upper end to the lower lifting lug, and at its lower end it is wrapped around and held tightly to the ring cable in a symmetrical binding manner to maintain the stability of the lower flexible ring cable assembly during the lifting process.

[0016] The beneficial effects of this invention are as follows: This invention supports the pre-installed upper grid beams and flying columns through a support system, allowing the upper rigid load-bearing structure to be installed first without the support of the lower flexible body. The already installed upper structure then serves as the lifting platform for the lower ring cable. This eliminates the need for a separate full-span scaffold for the lower ring cable, significantly reducing the amount of high-altitude work and construction costs. Flexible slings are used in a symmetrical binding method to directly act on the ring cable, without involving welding of the ring cable clamps. This flexible connection method protects the mechanical properties of the clamps from the effects of welding heat and stress concentration. Simultaneously, the symmetrical binding ensures that the resultant point of the lifting force coincides with the center of the ring cable cross-section. With the flexible slings remaining vertical, the lifting force is purely vertical, without generating a horizontal component that would cause the lower flexible ring cable assembly to rotate, thus ensuring the stability of the lifting posture and the accuracy of subsequent docking at the mechanical level. The horizontal assembly scheme in step S2 utilizes gravity to automatically rotate and position the flying column during hoisting, eliminating the complex high-altitude posture adjustment process and improving construction efficiency. The ground assembly method in step S3, based on pre-marked points and anti-torsion horizontal indicators on the surface of the ring cable, transfers the precision control work that needs to be completed at high altitudes to the ground, significantly improving the installation accuracy and operational convenience of the ring cable clamps. The auxiliary tie rod and the flexible sling form a triangular force system, further constraining the torsional freedom of the lower flexible ring cable assembly and enhancing lifting stability; at the same time, the auxiliary tie rod is detachably connected to the lower auxiliary ear plate, which can be removed after lifting is completed, freeing up the lower auxiliary ear plate for installing cross cables, realizing a smooth transition between temporary lifting connections and permanent structural connections. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a three-dimensional model of the spoke-type tensioned beam structure of the present invention; Figure 2 This is a schematic diagram of a three-dimensional model of the inner ring structure of the tensioned beam of the present invention; Figure 3 This is a schematic diagram of a three-dimensional model of the installation device of the present invention used for the installation of the inner ring structure of a tensioned beam; Figure 4 This is an elevation view of the installation device of the present invention used for the installation of the inner ring structure of a tensioned beam; Figure 5 for Figure 4 A schematic diagram of the structure after the ring cable has been lifted; Figure 6 This is a plan view of the embedded parts and bottom load guide beam on the floor structure at the bottom of the support system of the present invention; Figure 7 This is a plan view of the connecting rod, the cap, the top load guide beam, and the central cast steel component at the top of the support system of the present invention. Figure 8 This is a schematic diagram of a three-dimensional model of the support system of the present invention; Figure 9 This is a schematic diagram of a three-dimensional model of the lifting system of the present invention; Figure 10 for Figure 9 Enlarged structural diagram at point A; Figure 11 This is a three-dimensional model diagram of a block unit of the present invention; Figure 12 This is an enlarged structural diagram of the first connector of the present invention; Figure 13 This is an enlarged structural diagram of the second connector of the present invention.

[0018] In the diagram: 1-Floor structure; 2-Embedded parts; 3-Bottom guide beam; 4-Standard section of the jig; 5-Connecting rods; 6-Jig cap; 7-Top guide beam; 8-Central cast steel component; 9-Upper grid beam; 10-Flying column; 11-Upper lifting lug; 12-Lower lifting lug; 13-Steel strand; 14-Flexible sling; 15-Ring cable clamp; 16-Ring cable; 17-Through-type jack; 18-Cross cable; 19-Auxiliary tie rod; 20-Lower main lug plate; 21-Lower auxiliary lug plate; 22-Upper main lug plate; 23-Upper auxiliary lug plate; 100 - Inner ring structure of tensioned beam; 200 - Wheel-spoke tensioned beam; 300 - Exterior steel structure. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, the spoke-type tensioned beam structure includes an inner ring structure 100, a spoke-type tensioned beam 200, and an outer facade steel structure 300. The purpose of this invention is to enable the installation of the inner ring structure 100 of the tensioned beam.

[0021] like Figures 2-4 As shown, the installation device in this embodiment includes two parts: a support system and a lifting system.

[0022] The support system is used to erect and support the pre-installed upper grid beams 9 and flying columns 10 during the construction phase, so as to form an upper rigid load-bearing structure for subsequent lifting platforms.

[0023] This embodiment focuses on the central inner ring structure of a spoke-type tensioned beam in a sports stadium. The inner ring structure 100 is generally circular, with the central cast steel member 8 being a circular cast steel node located at the center of the entire inner ring structure 100. The upper rigid load-bearing structure, formed by the connection of multiple upper grid beams 9 with the central cast steel member 8, is also circular; the lower assembly of the ring cables 16 and cable clamps 15 is also correspondingly circular.

[0024] The component connection relationships are as follows: Multiple second connectors are welded to the lower end of the upper grid beam 9. The positions of these second connectors correspond to the positions of the upper ends of each flying column 10. Each second connector includes a centrally located upper main ear plate 22 and two symmetrically distributed upper auxiliary ear plates 23 on either side. The upper end of each flying column 10 is hinged to the upper main ear plate 22 via a pin. Multiple first connectors are provided at the upper end of the ring cable clamp 15. The positions of these first connectors correspond to the positions of the lower ends of each flying column 10. Each first connector includes a centrally located lower main ear plate 20 and two symmetrically distributed lower auxiliary ear plates 21 on either side. After the lower end of each flying column 10 falls into place, it is hinged to the lower main ear plate 20 via a pin.

[0025] The support system includes: embedded parts 2 embedded in the floor structure 1, a bottom guide beam 3 welded to the embedded parts 2, multiple standard frame sections 4 bolted to the bottom guide beam 3, connecting rods 5 connecting the standard frame sections 4, a cap 6 installed on the top of each standard frame section 4, and a top guide beam 7 welded between the caps 6 and connecting the support points into a whole. The multiple standard frame sections 4 are positioned directly below the hollow area enclosed by the central cast steel part 8 and the upper grid beam 9 to avoid the lifting path of the lower ring cable. The caps 6 and the top guide beam 7 together form a ring support platform to support the segmented units of the central cast steel part 8 and the upper grid beam 9, and to ensure overall stability and support rigidity during construction.

[0026] The lifting system is used to vertically lift the pre-assembled lower flexible ring cable assembly, which is mounted on the ground, to below the flying column 10, using the upper rigid load-bearing structure as the load point. The lifting system consists of multiple lifting units evenly distributed along the circumference of the ring cable 16. The specific composition of each lifting unit is as follows: Lift the upper lifting lug 11, which is pre-welded and fixed to the designated position of the upper grid beam 9 at the factory; The through-type jack 17 is fixedly installed at the lifting lug 11; The upper end of the steel strand 13 passes through the lifting lug 11 and is connected to the through-hole jack 17. The through-hole jack 17 provides vertical lifting force by reciprocating the steel strand 13. Lift the lower lifting lug 12, which is connected to the lower end of the steel strand 13; The flexible sling 14 has its upper end connected to the lower end of the lifting lug 12, and its lower end is wrapped around and tightly hugs the ring cable 16 from both sides of the ring cable clamp 15 in a symmetrical binding manner.

[0027] To further enhance the control over the attitude of the lower flexible ring cable assembly during the lifting process, in a preferred embodiment, each lifting unit further includes two auxiliary tie rods 19. The two auxiliary tie rods 19 are symmetrically arranged on both sides of the flexible sling 14, with their upper ends connected to the lower lifting lugs 12 and their lower ends detachably connected to the two lower auxiliary lug plates 21 on the ring cable clamps 15.

[0028] The specific process of implementing the installation method using the above-mentioned installation device is as follows: S1: Erect the support device and install the central cast steel component.

[0029] Embedded parts 2 are installed on the floor structure 1, and bottom load-bearing beams 3 are welded onto the embedded parts 2 as the base of the support system. For example... Figure 4 As shown, standard sections 4 of the frame are sequentially installed on the bottom guide beam 3 using bolts. As the erection height increases, connecting rods 5 are added between each standard section 4 according to calculation requirements to form a lattice-type load-bearing system, and the verticality of each standard section 4 is strictly controlled. The planar positions of multiple standard sections 4 are precisely planned directly below the annular hollow area enclosed by the circular central cast steel part 8 and its surrounding upper grid beam 9, ensuring that they do not affect the subsequent vertical lifting of the ring cable 16. Figure 8 As shown, multiple standard sections 4 of the jig are vertically connected to form a jig support column. The support device includes multiple jig support columns, with one jig support column located below the central cast steel part 8, and the remaining jig support columns spaced circumferentially along the upper grid beam 9. A jig cap 6 is installed on the top of the jig standard section 4 at the uppermost end of each jig support column, and a top load guide beam 7 is welded between each jig cap 6, thereby forming a ring support platform with sufficient rigidity and stability. Finally, the circular central cast steel part 8 is lifted and precisely fixed at the center position of the ring support platform.

[0030] S2: The modular units are horizontally assembled and hoisted as a whole to form a rigid load-bearing upper structure.

[0031] Using a simple assembly jig on floor structure 1, the upper grid beam 9 is divided into multiple units. Each unit is placed horizontally with its corresponding flying column 10, and the connecting hole at the upper end of the flying column 10 is hinged to the upper main ear plate 22 on the second connecting piece at the lower end of the upper grid beam 9 via a pin, completing the horizontal assembly of one unit. After assembly, a crane attaches a lifting device to the preset lifting point on the upper grid beam 9 and slowly lifts the unit. During the lifting process, the flying column 10 rotates downward around the pin at the upper main ear plate 22 due to its own weight, gradually rotating from a horizontal position to a vertically hanging position. All units are then hoisted onto the top guide beam 7 of the support platform, ensuring that the inner end of the upper grid beam 9 is precisely aligned and welded to the corresponding interface of the central cast steel part 8, while the outer end rests on the top guide beam 7. After all units are circumferentially butt-welded, a robust, closed circular upper rigid load-bearing structure is formed. This structure will serve as a load-bearing platform for lifting the lower flexible ring cable assembly in the subsequent step S4.

[0032] S3: The lower flexible ring cable assembly is precisely assembled on the ground.

[0033] On the floor structure 1 directly beneath the existing rigid load-bearing upper structure, the coiled ring cable 16 is unrolled. When manufactured, the ring cable 16 has positioning marks for each ring cable clamp 15 and a continuous anti-torsion horizontal indicator line extending along the cable body, marked on its surface according to the design drawings. The upper half of the ring cable clamp 15 is removed, and the lower half is placed horizontally on the ground jig. The ring cable 16 is smoothly placed into the cable groove along the anti-torsion horizontal indicator line, covering the upper half of the clamp and precisely adjusted so that both ends of the ring cable clamp 15 are flush with the positioning marks on the cable body. Simultaneously, it is ensured that the anti-torsion horizontal indicator line on the ring cable 16 is straight and free of spiral twist throughout the entire circumference. After verification, high-strength bolts are tightened sequentially onto all the ring cable clamps 15 to lock them into a circular lower flexible ring cable assembly. This step completes the precise positioning and anti-torsion installation of the clamps on the ground, laying the foundation for subsequent precise high-altitude docking with the flying column 10.

[0034] S4: Install the lifting device and lift the object.

[0035] At each designated location on the installed upper rigid load-bearing structure (where the upper lifting lugs 11 have been pre-welded at the factory), a through-hole jack 17 is installed. The upper end of the steel strand 13 passes through the upper lifting lug 11 and connects to the through-hole jack 17, while the lower end of the steel strand 13 connects to the lower lifting lug 12. A flexible sling 14 is connected to the lower end of each lower lifting lug 12. The lower end of the flexible sling 14 passes through the side of the ring cable clamp 15 and is tightly wrapped around the ring cable 16 between the two ring cable clamps 15 in a symmetrical binding manner. As a preferred embodiment, two auxiliary tie rods 19 are also connected to both sides of the lower end of the lower lifting lug 12 at each lifting point. The two auxiliary tie rods 19 are symmetrically arranged on both sides of the flexible sling 14, with their upper ends connected to the lower lifting lug 12 via shackles and their lower ends detachably connected to the lower auxiliary lug plates 21 on the two ring cable clamps 15 via pins. Thus, the flexible sling 14 and the auxiliary tie rod 19 form a symmetrical and stable triangular lifting force system between the upper lifting point and the lower ring cable assembly.

[0036] The hydraulic pump station is activated, and all through-hole jacks 17 are pressurized synchronously, driving the steel strands 13 to retract upwards, thus lifting the entire lower flexible ring cable assembly off the ground and vertically upwards. During the lifting process, the verticality of the flexible slings 14 at each lifting point is monitored in real time using measuring equipment such as a total station. If any deviation is detected, the lifting speed at the corresponding point is immediately adjusted via the hydraulic system to correct it, thus preventing horizontal force due to the deviation of the steel strands 13 and preventing overall rotation or out-of-plane twisting of the lower flexible ring cable assembly. The lower flexible ring cable assembly is lifted smoothly until the lower main lug plate 20 on each ring cable clamp 15 reaches and is close to the lower connecting plate of the corresponding flying column 10 directly above it.

[0037] S5: Connect the flying poles and install the cross cables.

[0038] After lifting stops, construction workers use existing or erected aerial work platforms to fine-tune the ring cable clamp 15, and immediately use pins to finally hinge and fix the lower main ear plate 20 on the ring cable clamp 15 to the lower end of the flying column 10. At this time, the vertical main force path is established. Subsequently, the auxiliary tie rods 19 at each lifting point are removed, and the two lower auxiliary ear plates 21 are released to restore their free state. Next, the cross cables 18 are installed: take two stay cables, for each pair of adjacent flying columns 10, connect the lower end of the first stay cable to a lower auxiliary ear plate 21 of the ring cable clamp 15 below one flying column 10, and connect the upper end to an upper auxiliary ear plate 23 on the second connector of the corresponding upper grid beam 9 above the other flying column 10; the second stay cable is then cross-connected in the opposite direction, thus forming a pair of cross stay cables between adjacent flying columns 10. After all the cross cables 18 are installed, the ring cables 16 are prestressed in stages according to the tensioning procedure specified in the design to eliminate the gaps between the components and make the structure actively take shape, and finally establish the stiffness and bearing capacity state required by the design, thus completing all the installation work of the inner ring structure.

[0039] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An installation method for an inner ring structure of a tensioned beam, the inner ring structure comprising an upper grid beam, flying columns, ring cables, and ring cable clamps, wherein the upper grid beam is a rigid structure and the ring cables are flexible structures, characterized in that... The method includes the following steps: S1: Erect a support device and install a central cast steel component on top of the support device; S2: Assemble multiple upper grid beams and corresponding flying columns on the ground to form a segmented unit, hoist the segmented unit as a whole to the top of the support device, and fix it to the central cast steel part in the air to form an upper rigid load-bearing structure for the subsequent lifting platform; S3: On the ground directly below the upper rigid load-bearing structure, the ring cable and multiple ring cable clamps are assembled as a whole to form a lower flexible ring cable assembly; S4: A lifting device is installed on the upper rigid load-bearing structure to vertically lift the lower flexible ring cable assembly until each ring cable clamp reaches below its corresponding flying column; the lifting device includes multiple lifting units distributed along the circumference of the ring cable, each lifting unit includes a flexible sling, the lower end of the flexible sling is symmetrically tied around and held tightly to the ring cables on both sides of the ring cable clamp to maintain the stability of the lower flexible ring cable assembly during the lifting process; S5: Hinge each ring cable clamp to the lower end of the corresponding flying column to complete the installation of the load-bearing system of the inner ring structure.

2. The installation method for an inner ring structure of a tensioned beam according to claim 1, characterized in that, In step S2, the upper grid beam and the flying column are assembled on the ground in a horizontal assembly manner. The two are connected by a hinge, so that the flying column can rotate around the hinge point to a vertical state under the action of gravity during the hoisting process, and the hoisting point is set on the upper grid beam.

3. The installation method for an inner ring structure of a tensioned beam according to claim 1, characterized in that, In step S3, the surface of the ring cable is pre-marked with cable clamp points and anti-torsion horizontal indicator lines; during assembly, the ring cable clamps are precisely aligned with the marked points and installed, and the anti-torsion horizontal indicator lines are kept straight and without twisting, so as to ensure that the ring cable clamps correspond to the positions of the installed flying posts.

4. The installation method for an inner ring structure of a tensioned beam according to claim 1, characterized in that, In step S4, the lifting unit further includes an upper lifting lug, a lower lifting lug, a steel strand, and a through-hole jack; the upper lifting lug is pre-fixed to the upper rigid load-bearing structure; the upper end of the steel strand passes through the upper lifting lug and is connected to the through-hole jack installed on the upper lifting lug, and the lower end of the steel strand is connected to the lower lifting lug; the through-hole jack is used to drive the steel strand to provide lifting force; the lower end of the lower lifting lug is connected to the flexible sling.

5. The installation method for an inner ring structure of a tensioned beam according to claim 4, characterized in that, In step S4, the lifting unit further includes auxiliary tie rods disposed on both sides of each of the lower lifting lugs. The upper ends of the two auxiliary tie rods are connected to the lower lifting lugs, and the lower ends are detachably connected to the two lower auxiliary lug plates on the ring cable clamp. The two auxiliary tie rods are symmetrically arranged on both sides of the flexible sling to form a stable lifting force system that prevents torsion.

6. The installation method for an inner ring structure of a tensioned beam according to claim 5, characterized in that, Step S5 includes: after the ring cable clamp is in place, firstly, hinge the lower main lug plate on the ring cable clamp to the lower end of the flying column above it, then remove the auxiliary tie rod, then connect the lower ends of the two inclined cables that make up the cross cable to the two lower auxiliary lug plates respectively, and connect the upper ends of the two inclined cables to the upper auxiliary lug plate at the lower end of the upper grid beam adjacent to the corresponding flying column, thereby forming a cross arrangement between adjacent flying columns.

7. The installation method for an inner ring structure of a tensioned beam according to claim 6, characterized in that, The upper end of the flying column is hinged to the upper main ear plate on the connector located at the lower end of the upper grid beam.

8. The installation method for an inner ring structure of a tensioned beam according to claim 7, characterized in that, The lower main lug plate and the two lower auxiliary lug plates together constitute the first connector located at the upper end of the ring cable clamp, with the two lower auxiliary lug plates distributed on both sides of the lower main lug plate; the upper main lug plate and the two upper auxiliary lug plates together constitute the second connector located at the lower end of the upper grid beam, with the two upper auxiliary lug plates distributed on both sides of the upper main lug plate.

9. The installation method for an inner ring structure of a tensioned beam according to claim 1, characterized in that, In step S1, the support device includes multiple standard sections of the jig and connecting rods connecting the multiple standard sections of the jig. The multiple standard sections of the jig are arranged directly below the hollow area enclosed by the central cast steel part and the upper grid beam, and are connected to each other at their tops by a top load guide beam to form a ring support platform.

10. An installation device for an inner ring structure of a tensioned beam, the inner ring structure comprising an upper grid beam, flying columns, ring cables, and ring cable clamps; characterized in that, The installation device is applied to the installation method according to any one of claims 1 to 9, and the installation device comprises: The support system is used to erect and support the pre-installed upper grid beams and flying columns to form a rigid upper load-bearing structure. The lifting system, using the upper rigid load-bearing structure as the load-bearing point, is used to lift the lower flexible ring cable assembly composed of ring cables and ring cable clamps. The lifting system includes multiple lifting units distributed circumferentially along the ring cables, and each lifting unit includes: The lifting lugs are then welded and fixed to the upper grid beam of the upper rigid load-bearing structure. Steel strand and the lifting lugs connecting its lower end; A through-hole jack is installed at the lifting lug and is used to drive the steel strand to provide lifting force; The flexible sling is connected at its upper end to the lower lifting lug, and at its lower end it is wrapped around and held tightly to the ring cable in a symmetrical binding manner to maintain the stability of the lower flexible ring cable assembly during the lifting process.

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